Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
91d76f53 | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
91d76f53 DG |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
17 | */ |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
91d76f53 | 20 | #include <errno.h> |
7972aab2 | 21 | #include <inttypes.h> |
91d76f53 DG |
22 | #include <pthread.h> |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
099e26bd | 25 | #include <string.h> |
aba8e916 DG |
26 | #include <sys/stat.h> |
27 | #include <sys/types.h> | |
099e26bd | 28 | #include <unistd.h> |
0df502fd | 29 | #include <urcu/compiler.h> |
331744e3 | 30 | #include <signal.h> |
bec39940 | 31 | |
990570ed | 32 | #include <common/common.h> |
86acf0da | 33 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 34 | |
7972aab2 | 35 | #include "buffer-registry.h" |
86acf0da | 36 | #include "fd-limit.h" |
8782cc74 | 37 | #include "health-sessiond.h" |
56fff090 | 38 | #include "ust-app.h" |
48842b30 | 39 | #include "ust-consumer.h" |
75018ab6 JG |
40 | #include "lttng-ust-ctl.h" |
41 | #include "lttng-ust-error.h" | |
0b2dc8df | 42 | #include "utils.h" |
fb83fe64 | 43 | #include "session.h" |
e9404c27 JG |
44 | #include "lttng-sessiond.h" |
45 | #include "notification-thread-commands.h" | |
5c408ad8 | 46 | #include "rotate.h" |
d80a6244 | 47 | |
c4b88406 MD |
48 | static |
49 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
50 | ||
d9bf3ca4 MD |
51 | /* Next available channel key. Access under next_channel_key_lock. */ |
52 | static uint64_t _next_channel_key; | |
53 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
54 | ||
55 | /* Next available session ID. Access under next_session_id_lock. */ | |
56 | static uint64_t _next_session_id; | |
57 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
58 | |
59 | /* | |
d9bf3ca4 | 60 | * Return the incremented value of next_channel_key. |
ffe60014 | 61 | */ |
d9bf3ca4 | 62 | static uint64_t get_next_channel_key(void) |
ffe60014 | 63 | { |
d9bf3ca4 MD |
64 | uint64_t ret; |
65 | ||
66 | pthread_mutex_lock(&next_channel_key_lock); | |
67 | ret = ++_next_channel_key; | |
68 | pthread_mutex_unlock(&next_channel_key_lock); | |
69 | return ret; | |
ffe60014 DG |
70 | } |
71 | ||
72 | /* | |
7972aab2 | 73 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 74 | */ |
d9bf3ca4 | 75 | static uint64_t get_next_session_id(void) |
ffe60014 | 76 | { |
d9bf3ca4 MD |
77 | uint64_t ret; |
78 | ||
79 | pthread_mutex_lock(&next_session_id_lock); | |
80 | ret = ++_next_session_id; | |
81 | pthread_mutex_unlock(&next_session_id_lock); | |
82 | return ret; | |
ffe60014 DG |
83 | } |
84 | ||
d65d2de8 DG |
85 | static void copy_channel_attr_to_ustctl( |
86 | struct ustctl_consumer_channel_attr *attr, | |
87 | struct lttng_ust_channel_attr *uattr) | |
88 | { | |
89 | /* Copy event attributes since the layout is different. */ | |
90 | attr->subbuf_size = uattr->subbuf_size; | |
91 | attr->num_subbuf = uattr->num_subbuf; | |
92 | attr->overwrite = uattr->overwrite; | |
93 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
94 | attr->read_timer_interval = uattr->read_timer_interval; | |
95 | attr->output = uattr->output; | |
491d1539 | 96 | attr->blocking_timeout = uattr->u.s.blocking_timeout; |
d65d2de8 DG |
97 | } |
98 | ||
025faf73 DG |
99 | /* |
100 | * Match function for the hash table lookup. | |
101 | * | |
102 | * It matches an ust app event based on three attributes which are the event | |
103 | * name, the filter bytecode and the loglevel. | |
104 | */ | |
18eace3b DG |
105 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
106 | { | |
107 | struct ust_app_event *event; | |
108 | const struct ust_app_ht_key *key; | |
2106efa0 | 109 | int ev_loglevel_value; |
18eace3b DG |
110 | |
111 | assert(node); | |
112 | assert(_key); | |
113 | ||
114 | event = caa_container_of(node, struct ust_app_event, node.node); | |
115 | key = _key; | |
2106efa0 | 116 | ev_loglevel_value = event->attr.loglevel; |
18eace3b | 117 | |
1af53eb5 | 118 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
119 | |
120 | /* Event name */ | |
121 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
122 | goto no_match; | |
123 | } | |
124 | ||
125 | /* Event loglevel. */ | |
2106efa0 | 126 | if (ev_loglevel_value != key->loglevel_type) { |
025faf73 | 127 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
2106efa0 PP |
128 | && key->loglevel_type == 0 && |
129 | ev_loglevel_value == -1) { | |
025faf73 DG |
130 | /* |
131 | * Match is accepted. This is because on event creation, the | |
132 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
133 | * -1 are accepted for this loglevel type since 0 is the one set by | |
134 | * the API when receiving an enable event. | |
135 | */ | |
136 | } else { | |
137 | goto no_match; | |
138 | } | |
18eace3b DG |
139 | } |
140 | ||
141 | /* One of the filters is NULL, fail. */ | |
142 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
143 | goto no_match; | |
144 | } | |
145 | ||
025faf73 DG |
146 | if (key->filter && event->filter) { |
147 | /* Both filters exists, check length followed by the bytecode. */ | |
148 | if (event->filter->len != key->filter->len || | |
149 | memcmp(event->filter->data, key->filter->data, | |
150 | event->filter->len) != 0) { | |
151 | goto no_match; | |
152 | } | |
18eace3b DG |
153 | } |
154 | ||
1af53eb5 JI |
155 | /* One of the exclusions is NULL, fail. */ |
156 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
157 | goto no_match; | |
158 | } | |
159 | ||
160 | if (key->exclusion && event->exclusion) { | |
161 | /* Both exclusions exists, check count followed by the names. */ | |
162 | if (event->exclusion->count != key->exclusion->count || | |
163 | memcmp(event->exclusion->names, key->exclusion->names, | |
164 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
165 | goto no_match; | |
166 | } | |
167 | } | |
168 | ||
169 | ||
025faf73 | 170 | /* Match. */ |
18eace3b DG |
171 | return 1; |
172 | ||
173 | no_match: | |
174 | return 0; | |
18eace3b DG |
175 | } |
176 | ||
025faf73 DG |
177 | /* |
178 | * Unique add of an ust app event in the given ht. This uses the custom | |
179 | * ht_match_ust_app_event match function and the event name as hash. | |
180 | */ | |
d0b96690 | 181 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
182 | struct ust_app_event *event) |
183 | { | |
184 | struct cds_lfht_node *node_ptr; | |
185 | struct ust_app_ht_key key; | |
d0b96690 | 186 | struct lttng_ht *ht; |
18eace3b | 187 | |
d0b96690 DG |
188 | assert(ua_chan); |
189 | assert(ua_chan->events); | |
18eace3b DG |
190 | assert(event); |
191 | ||
d0b96690 | 192 | ht = ua_chan->events; |
18eace3b DG |
193 | key.name = event->attr.name; |
194 | key.filter = event->filter; | |
2106efa0 | 195 | key.loglevel_type = event->attr.loglevel; |
91c89f23 | 196 | key.exclusion = event->exclusion; |
18eace3b DG |
197 | |
198 | node_ptr = cds_lfht_add_unique(ht->ht, | |
199 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
200 | ht_match_ust_app_event, &key, &event->node.node); | |
201 | assert(node_ptr == &event->node.node); | |
202 | } | |
203 | ||
d88aee68 DG |
204 | /* |
205 | * Close the notify socket from the given RCU head object. This MUST be called | |
206 | * through a call_rcu(). | |
207 | */ | |
208 | static void close_notify_sock_rcu(struct rcu_head *head) | |
209 | { | |
210 | int ret; | |
211 | struct ust_app_notify_sock_obj *obj = | |
212 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
213 | ||
214 | /* Must have a valid fd here. */ | |
215 | assert(obj->fd >= 0); | |
216 | ||
217 | ret = close(obj->fd); | |
218 | if (ret) { | |
219 | ERR("close notify sock %d RCU", obj->fd); | |
220 | } | |
221 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
222 | ||
223 | free(obj); | |
224 | } | |
225 | ||
7972aab2 DG |
226 | /* |
227 | * Return the session registry according to the buffer type of the given | |
228 | * session. | |
229 | * | |
230 | * A registry per UID object MUST exists before calling this function or else | |
231 | * it assert() if not found. RCU read side lock must be acquired. | |
232 | */ | |
233 | static struct ust_registry_session *get_session_registry( | |
234 | struct ust_app_session *ua_sess) | |
235 | { | |
236 | struct ust_registry_session *registry = NULL; | |
237 | ||
238 | assert(ua_sess); | |
239 | ||
240 | switch (ua_sess->buffer_type) { | |
241 | case LTTNG_BUFFER_PER_PID: | |
242 | { | |
243 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
244 | if (!reg_pid) { | |
245 | goto error; | |
246 | } | |
247 | registry = reg_pid->registry->reg.ust; | |
248 | break; | |
249 | } | |
250 | case LTTNG_BUFFER_PER_UID: | |
251 | { | |
252 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
470cc211 JG |
253 | ua_sess->tracing_id, ua_sess->bits_per_long, |
254 | ua_sess->real_credentials.uid); | |
7972aab2 DG |
255 | if (!reg_uid) { |
256 | goto error; | |
257 | } | |
258 | registry = reg_uid->registry->reg.ust; | |
259 | break; | |
260 | } | |
261 | default: | |
262 | assert(0); | |
263 | }; | |
264 | ||
265 | error: | |
266 | return registry; | |
267 | } | |
268 | ||
55cc08a6 DG |
269 | /* |
270 | * Delete ust context safely. RCU read lock must be held before calling | |
271 | * this function. | |
272 | */ | |
273 | static | |
fb45065e MD |
274 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx, |
275 | struct ust_app *app) | |
55cc08a6 | 276 | { |
ffe60014 DG |
277 | int ret; |
278 | ||
279 | assert(ua_ctx); | |
280 | ||
55cc08a6 | 281 | if (ua_ctx->obj) { |
fb45065e | 282 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 283 | ret = ustctl_release_object(sock, ua_ctx->obj); |
fb45065e | 284 | pthread_mutex_unlock(&app->sock_lock); |
d0b96690 DG |
285 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
286 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
287 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 288 | } |
55cc08a6 DG |
289 | free(ua_ctx->obj); |
290 | } | |
291 | free(ua_ctx); | |
292 | } | |
293 | ||
d80a6244 DG |
294 | /* |
295 | * Delete ust app event safely. RCU read lock must be held before calling | |
296 | * this function. | |
297 | */ | |
8b366481 | 298 | static |
fb45065e MD |
299 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event, |
300 | struct ust_app *app) | |
d80a6244 | 301 | { |
ffe60014 DG |
302 | int ret; |
303 | ||
304 | assert(ua_event); | |
305 | ||
53a80697 | 306 | free(ua_event->filter); |
951f0b71 JI |
307 | if (ua_event->exclusion != NULL) |
308 | free(ua_event->exclusion); | |
edb67388 | 309 | if (ua_event->obj != NULL) { |
fb45065e | 310 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 311 | ret = ustctl_release_object(sock, ua_event->obj); |
fb45065e | 312 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
313 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
314 | ERR("UST app sock %d release event obj failed with ret %d", | |
315 | sock, ret); | |
316 | } | |
edb67388 DG |
317 | free(ua_event->obj); |
318 | } | |
d80a6244 DG |
319 | free(ua_event); |
320 | } | |
321 | ||
322 | /* | |
7972aab2 DG |
323 | * Release ust data object of the given stream. |
324 | * | |
325 | * Return 0 on success or else a negative value. | |
d80a6244 | 326 | */ |
fb45065e MD |
327 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream, |
328 | struct ust_app *app) | |
d80a6244 | 329 | { |
7972aab2 | 330 | int ret = 0; |
ffe60014 DG |
331 | |
332 | assert(stream); | |
333 | ||
8b366481 | 334 | if (stream->obj) { |
fb45065e | 335 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 336 | ret = ustctl_release_object(sock, stream->obj); |
fb45065e | 337 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
338 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
339 | ERR("UST app sock %d release stream obj failed with ret %d", | |
340 | sock, ret); | |
341 | } | |
4063050c | 342 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
343 | free(stream->obj); |
344 | } | |
7972aab2 DG |
345 | |
346 | return ret; | |
347 | } | |
348 | ||
349 | /* | |
350 | * Delete ust app stream safely. RCU read lock must be held before calling | |
351 | * this function. | |
352 | */ | |
353 | static | |
fb45065e MD |
354 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream, |
355 | struct ust_app *app) | |
7972aab2 DG |
356 | { |
357 | assert(stream); | |
358 | ||
fb45065e | 359 | (void) release_ust_app_stream(sock, stream, app); |
84cd17c6 | 360 | free(stream); |
d80a6244 DG |
361 | } |
362 | ||
36b588ed MD |
363 | /* |
364 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
365 | * section and outside of call_rcu thread, so we postpone its execution |
366 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
367 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
368 | */ |
369 | static | |
370 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
371 | { | |
372 | struct ust_app_channel *ua_chan = | |
373 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
374 | ||
0b2dc8df MD |
375 | ht_cleanup_push(ua_chan->ctx); |
376 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
377 | free(ua_chan); |
378 | } | |
379 | ||
fb83fe64 JD |
380 | /* |
381 | * Extract the lost packet or discarded events counter when the channel is | |
382 | * being deleted and store the value in the parent channel so we can | |
383 | * access it from lttng list and at stop/destroy. | |
82cac6d2 JG |
384 | * |
385 | * The session list lock must be held by the caller. | |
fb83fe64 JD |
386 | */ |
387 | static | |
388 | void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan) | |
389 | { | |
390 | uint64_t discarded = 0, lost = 0; | |
391 | struct ltt_session *session; | |
392 | struct ltt_ust_channel *uchan; | |
393 | ||
394 | if (ua_chan->attr.type != LTTNG_UST_CHAN_PER_CPU) { | |
395 | return; | |
396 | } | |
397 | ||
398 | rcu_read_lock(); | |
399 | session = session_find_by_id(ua_chan->session->tracing_id); | |
d68ec974 JG |
400 | if (!session || !session->ust_session) { |
401 | /* | |
402 | * Not finding the session is not an error because there are | |
403 | * multiple ways the channels can be torn down. | |
404 | * | |
405 | * 1) The session daemon can initiate the destruction of the | |
406 | * ust app session after receiving a destroy command or | |
407 | * during its shutdown/teardown. | |
408 | * 2) The application, since we are in per-pid tracing, is | |
409 | * unregistering and tearing down its ust app session. | |
410 | * | |
411 | * Both paths are protected by the session list lock which | |
412 | * ensures that the accounting of lost packets and discarded | |
413 | * events is done exactly once. The session is then unpublished | |
414 | * from the session list, resulting in this condition. | |
415 | */ | |
fb83fe64 JD |
416 | goto end; |
417 | } | |
418 | ||
419 | if (ua_chan->attr.overwrite) { | |
420 | consumer_get_lost_packets(ua_chan->session->tracing_id, | |
421 | ua_chan->key, session->ust_session->consumer, | |
422 | &lost); | |
423 | } else { | |
424 | consumer_get_discarded_events(ua_chan->session->tracing_id, | |
425 | ua_chan->key, session->ust_session->consumer, | |
426 | &discarded); | |
427 | } | |
428 | uchan = trace_ust_find_channel_by_name( | |
429 | session->ust_session->domain_global.channels, | |
430 | ua_chan->name); | |
431 | if (!uchan) { | |
432 | ERR("Missing UST channel to store discarded counters"); | |
433 | goto end; | |
434 | } | |
435 | ||
436 | uchan->per_pid_closed_app_discarded += discarded; | |
437 | uchan->per_pid_closed_app_lost += lost; | |
438 | ||
439 | end: | |
440 | rcu_read_unlock(); | |
e32d7f27 JG |
441 | if (session) { |
442 | session_put(session); | |
443 | } | |
fb83fe64 JD |
444 | } |
445 | ||
d80a6244 DG |
446 | /* |
447 | * Delete ust app channel safely. RCU read lock must be held before calling | |
448 | * this function. | |
82cac6d2 JG |
449 | * |
450 | * The session list lock must be held by the caller. | |
d80a6244 | 451 | */ |
8b366481 | 452 | static |
d0b96690 DG |
453 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
454 | struct ust_app *app) | |
d80a6244 DG |
455 | { |
456 | int ret; | |
bec39940 | 457 | struct lttng_ht_iter iter; |
d80a6244 | 458 | struct ust_app_event *ua_event; |
55cc08a6 | 459 | struct ust_app_ctx *ua_ctx; |
030a66fa | 460 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 461 | struct ust_registry_session *registry; |
d80a6244 | 462 | |
ffe60014 DG |
463 | assert(ua_chan); |
464 | ||
465 | DBG3("UST app deleting channel %s", ua_chan->name); | |
466 | ||
55cc08a6 | 467 | /* Wipe stream */ |
d80a6244 | 468 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 469 | cds_list_del(&stream->list); |
fb45065e | 470 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
471 | } |
472 | ||
55cc08a6 | 473 | /* Wipe context */ |
bec39940 | 474 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 475 | cds_list_del(&ua_ctx->list); |
bec39940 | 476 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 | 477 | assert(!ret); |
fb45065e | 478 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 479 | } |
d80a6244 | 480 | |
55cc08a6 | 481 | /* Wipe events */ |
bec39940 DG |
482 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
483 | node.node) { | |
484 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 485 | assert(!ret); |
fb45065e | 486 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 487 | } |
edb67388 | 488 | |
c8335706 MD |
489 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
490 | /* Wipe and free registry from session registry. */ | |
491 | registry = get_session_registry(ua_chan->session); | |
492 | if (registry) { | |
e9404c27 | 493 | ust_registry_channel_del_free(registry, ua_chan->key, |
e38d96f9 MD |
494 | sock >= 0); |
495 | } | |
45798a31 JG |
496 | /* |
497 | * A negative socket can be used by the caller when | |
498 | * cleaning-up a ua_chan in an error path. Skip the | |
499 | * accounting in this case. | |
500 | */ | |
e38d96f9 MD |
501 | if (sock >= 0) { |
502 | save_per_pid_lost_discarded_counters(ua_chan); | |
c8335706 | 503 | } |
7972aab2 | 504 | } |
d0b96690 | 505 | |
edb67388 | 506 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
507 | /* Remove channel from application UST object descriptor. */ |
508 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
509 | ret = lttng_ht_del(app->ust_objd, &iter); |
510 | assert(!ret); | |
fb45065e | 511 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 512 | ret = ustctl_release_object(sock, ua_chan->obj); |
fb45065e | 513 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
514 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
515 | ERR("UST app sock %d release channel obj failed with ret %d", | |
516 | sock, ret); | |
517 | } | |
7972aab2 | 518 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
519 | free(ua_chan->obj); |
520 | } | |
36b588ed | 521 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
522 | } |
523 | ||
fb45065e MD |
524 | int ust_app_register_done(struct ust_app *app) |
525 | { | |
526 | int ret; | |
527 | ||
528 | pthread_mutex_lock(&app->sock_lock); | |
529 | ret = ustctl_register_done(app->sock); | |
530 | pthread_mutex_unlock(&app->sock_lock); | |
531 | return ret; | |
532 | } | |
533 | ||
534 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data) | |
535 | { | |
536 | int ret, sock; | |
537 | ||
538 | if (app) { | |
539 | pthread_mutex_lock(&app->sock_lock); | |
540 | sock = app->sock; | |
541 | } else { | |
542 | sock = -1; | |
543 | } | |
544 | ret = ustctl_release_object(sock, data); | |
545 | if (app) { | |
546 | pthread_mutex_unlock(&app->sock_lock); | |
547 | } | |
548 | return ret; | |
549 | } | |
550 | ||
331744e3 | 551 | /* |
1b532a60 DG |
552 | * Push metadata to consumer socket. |
553 | * | |
dc2bbdae MD |
554 | * RCU read-side lock must be held to guarantee existance of socket. |
555 | * Must be called with the ust app session lock held. | |
556 | * Must be called with the registry lock held. | |
331744e3 JD |
557 | * |
558 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
559 | * Returning a -EPIPE return value means we could not send the metadata, |
560 | * but it can be caused by recoverable errors (e.g. the application has | |
561 | * terminated concurrently). | |
331744e3 JD |
562 | */ |
563 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
564 | struct consumer_socket *socket, int send_zero_data) | |
565 | { | |
566 | int ret; | |
567 | char *metadata_str = NULL; | |
c585821b | 568 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 569 | ssize_t ret_val; |
93ec662e | 570 | uint64_t metadata_key, metadata_version; |
331744e3 JD |
571 | |
572 | assert(registry); | |
573 | assert(socket); | |
1b532a60 | 574 | |
c585821b MD |
575 | metadata_key = registry->metadata_key; |
576 | ||
ce34fcd0 | 577 | /* |
dc2bbdae MD |
578 | * Means that no metadata was assigned to the session. This can |
579 | * happens if no start has been done previously. | |
ce34fcd0 | 580 | */ |
c585821b | 581 | if (!metadata_key) { |
ce34fcd0 MD |
582 | return 0; |
583 | } | |
584 | ||
331744e3 JD |
585 | offset = registry->metadata_len_sent; |
586 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 587 | new_metadata_len_sent = registry->metadata_len; |
93ec662e | 588 | metadata_version = registry->metadata_version; |
331744e3 JD |
589 | if (len == 0) { |
590 | DBG3("No metadata to push for metadata key %" PRIu64, | |
591 | registry->metadata_key); | |
592 | ret_val = len; | |
593 | if (send_zero_data) { | |
594 | DBG("No metadata to push"); | |
595 | goto push_data; | |
596 | } | |
597 | goto end; | |
598 | } | |
599 | ||
600 | /* Allocate only what we have to send. */ | |
601 | metadata_str = zmalloc(len); | |
602 | if (!metadata_str) { | |
603 | PERROR("zmalloc ust app metadata string"); | |
604 | ret_val = -ENOMEM; | |
605 | goto error; | |
606 | } | |
c585821b | 607 | /* Copy what we haven't sent out. */ |
331744e3 | 608 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
609 | |
610 | push_data: | |
c585821b MD |
611 | pthread_mutex_unlock(®istry->lock); |
612 | /* | |
613 | * We need to unlock the registry while we push metadata to | |
614 | * break a circular dependency between the consumerd metadata | |
615 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
616 | * to the consumerd awaits that it gets pushed all the way to | |
617 | * relayd, but doing so requires grabbing the metadata lock. If | |
618 | * a concurrent metadata request is being performed by | |
619 | * consumerd, this can try to grab the registry lock on the | |
620 | * sessiond while holding the metadata lock on the consumer | |
621 | * daemon. Those push and pull schemes are performed on two | |
622 | * different bidirectionnal communication sockets. | |
623 | */ | |
624 | ret = consumer_push_metadata(socket, metadata_key, | |
93ec662e | 625 | metadata_str, len, offset, metadata_version); |
c585821b | 626 | pthread_mutex_lock(®istry->lock); |
331744e3 | 627 | if (ret < 0) { |
000baf6a | 628 | /* |
dc2bbdae MD |
629 | * There is an acceptable race here between the registry |
630 | * metadata key assignment and the creation on the | |
631 | * consumer. The session daemon can concurrently push | |
632 | * metadata for this registry while being created on the | |
633 | * consumer since the metadata key of the registry is | |
634 | * assigned *before* it is setup to avoid the consumer | |
635 | * to ask for metadata that could possibly be not found | |
636 | * in the session daemon. | |
000baf6a | 637 | * |
dc2bbdae MD |
638 | * The metadata will get pushed either by the session |
639 | * being stopped or the consumer requesting metadata if | |
640 | * that race is triggered. | |
000baf6a DG |
641 | */ |
642 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
643 | ret = 0; | |
c585821b MD |
644 | } else { |
645 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 646 | } |
331744e3 JD |
647 | ret_val = ret; |
648 | goto error_push; | |
c585821b MD |
649 | } else { |
650 | /* | |
651 | * Metadata may have been concurrently pushed, since | |
652 | * we're not holding the registry lock while pushing to | |
653 | * consumer. This is handled by the fact that we send | |
654 | * the metadata content, size, and the offset at which | |
655 | * that metadata belongs. This may arrive out of order | |
656 | * on the consumer side, and the consumer is able to | |
657 | * deal with overlapping fragments. The consumer | |
658 | * supports overlapping fragments, which must be | |
659 | * contiguous starting from offset 0. We keep the | |
660 | * largest metadata_len_sent value of the concurrent | |
661 | * send. | |
662 | */ | |
663 | registry->metadata_len_sent = | |
664 | max_t(size_t, registry->metadata_len_sent, | |
665 | new_metadata_len_sent); | |
331744e3 | 666 | } |
331744e3 JD |
667 | free(metadata_str); |
668 | return len; | |
669 | ||
670 | end: | |
671 | error: | |
ce34fcd0 MD |
672 | if (ret_val) { |
673 | /* | |
dc2bbdae MD |
674 | * On error, flag the registry that the metadata is |
675 | * closed. We were unable to push anything and this | |
676 | * means that either the consumer is not responding or | |
677 | * the metadata cache has been destroyed on the | |
678 | * consumer. | |
ce34fcd0 MD |
679 | */ |
680 | registry->metadata_closed = 1; | |
681 | } | |
331744e3 JD |
682 | error_push: |
683 | free(metadata_str); | |
684 | return ret_val; | |
685 | } | |
686 | ||
d88aee68 | 687 | /* |
ce34fcd0 | 688 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
689 | * Either sock or consumer is required : if sock is NULL, the default |
690 | * socket to send the metadata is retrieved from consumer, if sock | |
691 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 692 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
693 | * therefore ensuring existance of registry. It also ensures existance |
694 | * of socket throughout this function. | |
d88aee68 DG |
695 | * |
696 | * Return 0 on success else a negative error. | |
2c57e06d MD |
697 | * Returning a -EPIPE return value means we could not send the metadata, |
698 | * but it can be caused by recoverable errors (e.g. the application has | |
699 | * terminated concurrently). | |
d88aee68 | 700 | */ |
7972aab2 DG |
701 | static int push_metadata(struct ust_registry_session *registry, |
702 | struct consumer_output *consumer) | |
d88aee68 | 703 | { |
331744e3 JD |
704 | int ret_val; |
705 | ssize_t ret; | |
d88aee68 DG |
706 | struct consumer_socket *socket; |
707 | ||
7972aab2 DG |
708 | assert(registry); |
709 | assert(consumer); | |
710 | ||
ce34fcd0 | 711 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 712 | if (registry->metadata_closed) { |
dc2bbdae MD |
713 | ret_val = -EPIPE; |
714 | goto error; | |
d88aee68 DG |
715 | } |
716 | ||
d88aee68 | 717 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
718 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
719 | consumer); | |
d88aee68 | 720 | if (!socket) { |
331744e3 | 721 | ret_val = -1; |
ce34fcd0 | 722 | goto error; |
d88aee68 DG |
723 | } |
724 | ||
331744e3 | 725 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 726 | if (ret < 0) { |
331744e3 | 727 | ret_val = ret; |
ce34fcd0 | 728 | goto error; |
d88aee68 | 729 | } |
dc2bbdae | 730 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
731 | return 0; |
732 | ||
ce34fcd0 | 733 | error: |
dc2bbdae | 734 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 735 | return ret_val; |
d88aee68 DG |
736 | } |
737 | ||
738 | /* | |
739 | * Send to the consumer a close metadata command for the given session. Once | |
740 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 741 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
742 | * in the destroy path. |
743 | * | |
a70ac2f4 MD |
744 | * Do not hold the registry lock while communicating with the consumerd, because |
745 | * doing so causes inter-process deadlocks between consumerd and sessiond with | |
746 | * the metadata request notification. | |
747 | * | |
d88aee68 DG |
748 | * Return 0 on success else a negative value. |
749 | */ | |
7972aab2 DG |
750 | static int close_metadata(struct ust_registry_session *registry, |
751 | struct consumer_output *consumer) | |
d88aee68 DG |
752 | { |
753 | int ret; | |
754 | struct consumer_socket *socket; | |
a70ac2f4 MD |
755 | uint64_t metadata_key; |
756 | bool registry_was_already_closed; | |
d88aee68 | 757 | |
7972aab2 DG |
758 | assert(registry); |
759 | assert(consumer); | |
d88aee68 | 760 | |
7972aab2 DG |
761 | rcu_read_lock(); |
762 | ||
ce34fcd0 | 763 | pthread_mutex_lock(®istry->lock); |
a70ac2f4 MD |
764 | metadata_key = registry->metadata_key; |
765 | registry_was_already_closed = registry->metadata_closed; | |
766 | if (metadata_key != 0) { | |
767 | /* | |
768 | * Metadata closed. Even on error this means that the consumer | |
769 | * is not responding or not found so either way a second close | |
770 | * should NOT be emit for this registry. | |
771 | */ | |
772 | registry->metadata_closed = 1; | |
773 | } | |
774 | pthread_mutex_unlock(®istry->lock); | |
ce34fcd0 | 775 | |
a70ac2f4 | 776 | if (metadata_key == 0 || registry_was_already_closed) { |
d88aee68 | 777 | ret = 0; |
1b532a60 | 778 | goto end; |
d88aee68 DG |
779 | } |
780 | ||
d88aee68 | 781 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
782 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
783 | consumer); | |
d88aee68 DG |
784 | if (!socket) { |
785 | ret = -1; | |
a70ac2f4 | 786 | goto end; |
d88aee68 DG |
787 | } |
788 | ||
a70ac2f4 | 789 | ret = consumer_close_metadata(socket, metadata_key); |
d88aee68 | 790 | if (ret < 0) { |
a70ac2f4 | 791 | goto end; |
d88aee68 DG |
792 | } |
793 | ||
1b532a60 | 794 | end: |
7972aab2 | 795 | rcu_read_unlock(); |
d88aee68 DG |
796 | return ret; |
797 | } | |
798 | ||
36b588ed MD |
799 | /* |
800 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
801 | * section and outside of call_rcu thread, so we postpone its execution |
802 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
803 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
804 | */ |
805 | static | |
806 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
807 | { | |
808 | struct ust_app_session *ua_sess = | |
809 | caa_container_of(head, struct ust_app_session, rcu_head); | |
810 | ||
0b2dc8df | 811 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
812 | free(ua_sess); |
813 | } | |
814 | ||
d80a6244 DG |
815 | /* |
816 | * Delete ust app session safely. RCU read lock must be held before calling | |
817 | * this function. | |
82cac6d2 JG |
818 | * |
819 | * The session list lock must be held by the caller. | |
d80a6244 | 820 | */ |
8b366481 | 821 | static |
d0b96690 DG |
822 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
823 | struct ust_app *app) | |
d80a6244 DG |
824 | { |
825 | int ret; | |
bec39940 | 826 | struct lttng_ht_iter iter; |
d80a6244 | 827 | struct ust_app_channel *ua_chan; |
7972aab2 | 828 | struct ust_registry_session *registry; |
d80a6244 | 829 | |
d88aee68 DG |
830 | assert(ua_sess); |
831 | ||
1b532a60 DG |
832 | pthread_mutex_lock(&ua_sess->lock); |
833 | ||
b161602a MD |
834 | assert(!ua_sess->deleted); |
835 | ua_sess->deleted = true; | |
836 | ||
7972aab2 | 837 | registry = get_session_registry(ua_sess); |
fad1ed2f | 838 | /* Registry can be null on error path during initialization. */ |
ce34fcd0 | 839 | if (registry) { |
d88aee68 | 840 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 841 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 842 | |
7972aab2 DG |
843 | /* |
844 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
845 | * metadata only on destroy trace session in this case. Also, the |
846 | * previous push metadata could have flag the metadata registry to | |
847 | * close so don't send a close command if closed. | |
7972aab2 | 848 | */ |
ce34fcd0 | 849 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
850 | /* And ask to close it for this session registry. */ |
851 | (void) close_metadata(registry, ua_sess->consumer); | |
852 | } | |
d80a6244 DG |
853 | } |
854 | ||
bec39940 DG |
855 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
856 | node.node) { | |
857 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 858 | assert(!ret); |
d0b96690 | 859 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 860 | } |
d80a6244 | 861 | |
7972aab2 DG |
862 | /* In case of per PID, the registry is kept in the session. */ |
863 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
864 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
865 | if (reg_pid) { | |
fad1ed2f JR |
866 | /* |
867 | * Registry can be null on error path during | |
868 | * initialization. | |
869 | */ | |
7972aab2 DG |
870 | buffer_reg_pid_remove(reg_pid); |
871 | buffer_reg_pid_destroy(reg_pid); | |
872 | } | |
873 | } | |
d0b96690 | 874 | |
aee6bafd | 875 | if (ua_sess->handle != -1) { |
fb45065e | 876 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 877 | ret = ustctl_release_handle(sock, ua_sess->handle); |
fb45065e | 878 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
879 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
880 | ERR("UST app sock %d release session handle failed with ret %d", | |
881 | sock, ret); | |
882 | } | |
10b56aef MD |
883 | /* Remove session from application UST object descriptor. */ |
884 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
885 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
886 | assert(!ret); | |
aee6bafd | 887 | } |
10b56aef | 888 | |
1b532a60 DG |
889 | pthread_mutex_unlock(&ua_sess->lock); |
890 | ||
6addfa37 MD |
891 | consumer_output_put(ua_sess->consumer); |
892 | ||
36b588ed | 893 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 894 | } |
91d76f53 DG |
895 | |
896 | /* | |
284d8f55 DG |
897 | * Delete a traceable application structure from the global list. Never call |
898 | * this function outside of a call_rcu call. | |
36b588ed MD |
899 | * |
900 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 901 | */ |
8b366481 DG |
902 | static |
903 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 904 | { |
8b366481 | 905 | int ret, sock; |
d42f20df | 906 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 907 | |
82cac6d2 JG |
908 | /* |
909 | * The session list lock must be held during this function to guarantee | |
910 | * the existence of ua_sess. | |
911 | */ | |
912 | session_lock_list(); | |
d80a6244 | 913 | /* Delete ust app sessions info */ |
852d0037 DG |
914 | sock = app->sock; |
915 | app->sock = -1; | |
d80a6244 | 916 | |
8b366481 | 917 | /* Wipe sessions */ |
d42f20df DG |
918 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
919 | teardown_node) { | |
920 | /* Free every object in the session and the session. */ | |
36b588ed | 921 | rcu_read_lock(); |
d0b96690 | 922 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 923 | rcu_read_unlock(); |
d80a6244 | 924 | } |
36b588ed | 925 | |
0b2dc8df | 926 | ht_cleanup_push(app->sessions); |
10b56aef | 927 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 928 | ht_cleanup_push(app->ust_objd); |
d80a6244 | 929 | |
6414a713 | 930 | /* |
852d0037 DG |
931 | * Wait until we have deleted the application from the sock hash table |
932 | * before closing this socket, otherwise an application could re-use the | |
933 | * socket ID and race with the teardown, using the same hash table entry. | |
934 | * | |
935 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
936 | * all RCU readers that could run concurrently with unregister app, | |
937 | * therefore we _need_ to only close that socket after a grace period. So | |
938 | * it should stay in this RCU callback. | |
939 | * | |
940 | * This close() is a very important step of the synchronization model so | |
941 | * every modification to this function must be carefully reviewed. | |
6414a713 | 942 | */ |
799e2c4f MD |
943 | ret = close(sock); |
944 | if (ret) { | |
945 | PERROR("close"); | |
946 | } | |
4063050c | 947 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 948 | |
852d0037 | 949 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 950 | free(app); |
82cac6d2 | 951 | session_unlock_list(); |
099e26bd DG |
952 | } |
953 | ||
954 | /* | |
f6a9efaa | 955 | * URCU intermediate call to delete an UST app. |
099e26bd | 956 | */ |
8b366481 DG |
957 | static |
958 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 959 | { |
bec39940 DG |
960 | struct lttng_ht_node_ulong *node = |
961 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 962 | struct ust_app *app = |
852d0037 | 963 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 964 | |
852d0037 | 965 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 966 | delete_ust_app(app); |
099e26bd DG |
967 | } |
968 | ||
ffe60014 DG |
969 | /* |
970 | * Delete the session from the application ht and delete the data structure by | |
971 | * freeing every object inside and releasing them. | |
82cac6d2 JG |
972 | * |
973 | * The session list lock must be held by the caller. | |
ffe60014 | 974 | */ |
d0b96690 | 975 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
976 | struct ust_app_session *ua_sess) |
977 | { | |
978 | int ret; | |
979 | struct lttng_ht_iter iter; | |
980 | ||
981 | assert(app); | |
982 | assert(ua_sess); | |
983 | ||
984 | iter.iter.node = &ua_sess->node.node; | |
985 | ret = lttng_ht_del(app->sessions, &iter); | |
986 | if (ret) { | |
987 | /* Already scheduled for teardown. */ | |
988 | goto end; | |
989 | } | |
990 | ||
991 | /* Once deleted, free the data structure. */ | |
d0b96690 | 992 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
993 | |
994 | end: | |
995 | return; | |
996 | } | |
997 | ||
8b366481 DG |
998 | /* |
999 | * Alloc new UST app session. | |
1000 | */ | |
1001 | static | |
40bbd087 | 1002 | struct ust_app_session *alloc_ust_app_session(void) |
8b366481 DG |
1003 | { |
1004 | struct ust_app_session *ua_sess; | |
1005 | ||
1006 | /* Init most of the default value by allocating and zeroing */ | |
1007 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
1008 | if (ua_sess == NULL) { | |
1009 | PERROR("malloc"); | |
ffe60014 | 1010 | goto error_free; |
8b366481 DG |
1011 | } |
1012 | ||
1013 | ua_sess->handle = -1; | |
bec39940 | 1014 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 1015 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 1016 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 1017 | |
8b366481 DG |
1018 | return ua_sess; |
1019 | ||
ffe60014 | 1020 | error_free: |
8b366481 DG |
1021 | return NULL; |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * Alloc new UST app channel. | |
1026 | */ | |
1027 | static | |
1028 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 1029 | struct ust_app_session *ua_sess, |
ffe60014 | 1030 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
1031 | { |
1032 | struct ust_app_channel *ua_chan; | |
1033 | ||
1034 | /* Init most of the default value by allocating and zeroing */ | |
1035 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
1036 | if (ua_chan == NULL) { | |
1037 | PERROR("malloc"); | |
1038 | goto error; | |
1039 | } | |
1040 | ||
1041 | /* Setup channel name */ | |
1042 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
1043 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
1044 | ||
1045 | ua_chan->enabled = 1; | |
1046 | ua_chan->handle = -1; | |
45893984 | 1047 | ua_chan->session = ua_sess; |
ffe60014 | 1048 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
1049 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1050 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
1051 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
1052 | |
1053 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 1054 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
1055 | |
1056 | /* Copy attributes */ | |
1057 | if (attr) { | |
ffe60014 | 1058 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
1059 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
1060 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
1061 | ua_chan->attr.overwrite = attr->overwrite; | |
1062 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
1063 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
1064 | ua_chan->attr.output = attr->output; | |
491d1539 | 1065 | ua_chan->attr.blocking_timeout = attr->u.s.blocking_timeout; |
8b366481 | 1066 | } |
ffe60014 DG |
1067 | /* By default, the channel is a per cpu channel. */ |
1068 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
1069 | |
1070 | DBG3("UST app channel %s allocated", ua_chan->name); | |
1071 | ||
1072 | return ua_chan; | |
1073 | ||
1074 | error: | |
1075 | return NULL; | |
1076 | } | |
1077 | ||
37f1c236 DG |
1078 | /* |
1079 | * Allocate and initialize a UST app stream. | |
1080 | * | |
1081 | * Return newly allocated stream pointer or NULL on error. | |
1082 | */ | |
ffe60014 | 1083 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
1084 | { |
1085 | struct ust_app_stream *stream = NULL; | |
1086 | ||
1087 | stream = zmalloc(sizeof(*stream)); | |
1088 | if (stream == NULL) { | |
1089 | PERROR("zmalloc ust app stream"); | |
1090 | goto error; | |
1091 | } | |
1092 | ||
1093 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
1094 | stream->handle = -1; | |
1095 | ||
1096 | error: | |
1097 | return stream; | |
1098 | } | |
1099 | ||
8b366481 DG |
1100 | /* |
1101 | * Alloc new UST app event. | |
1102 | */ | |
1103 | static | |
1104 | struct ust_app_event *alloc_ust_app_event(char *name, | |
1105 | struct lttng_ust_event *attr) | |
1106 | { | |
1107 | struct ust_app_event *ua_event; | |
1108 | ||
1109 | /* Init most of the default value by allocating and zeroing */ | |
1110 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
1111 | if (ua_event == NULL) { | |
20533947 | 1112 | PERROR("Failed to allocate ust_app_event structure"); |
8b366481 DG |
1113 | goto error; |
1114 | } | |
1115 | ||
1116 | ua_event->enabled = 1; | |
1117 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1118 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1119 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1120 | |
1121 | /* Copy attributes */ | |
1122 | if (attr) { | |
1123 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1124 | } | |
1125 | ||
1126 | DBG3("UST app event %s allocated", ua_event->name); | |
1127 | ||
1128 | return ua_event; | |
1129 | ||
1130 | error: | |
1131 | return NULL; | |
1132 | } | |
1133 | ||
1134 | /* | |
1135 | * Alloc new UST app context. | |
1136 | */ | |
1137 | static | |
bdf64013 | 1138 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) |
8b366481 DG |
1139 | { |
1140 | struct ust_app_ctx *ua_ctx; | |
1141 | ||
1142 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
1143 | if (ua_ctx == NULL) { | |
1144 | goto error; | |
1145 | } | |
1146 | ||
31746f93 DG |
1147 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1148 | ||
8b366481 DG |
1149 | if (uctx) { |
1150 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
bdf64013 JG |
1151 | if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) { |
1152 | char *provider_name = NULL, *ctx_name = NULL; | |
1153 | ||
1154 | provider_name = strdup(uctx->u.app_ctx.provider_name); | |
1155 | ctx_name = strdup(uctx->u.app_ctx.ctx_name); | |
1156 | if (!provider_name || !ctx_name) { | |
1157 | free(provider_name); | |
1158 | free(ctx_name); | |
1159 | goto error; | |
1160 | } | |
1161 | ||
1162 | ua_ctx->ctx.u.app_ctx.provider_name = provider_name; | |
1163 | ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; | |
1164 | } | |
8b366481 DG |
1165 | } |
1166 | ||
1167 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
8b366481 | 1168 | return ua_ctx; |
bdf64013 JG |
1169 | error: |
1170 | free(ua_ctx); | |
1171 | return NULL; | |
8b366481 DG |
1172 | } |
1173 | ||
025faf73 DG |
1174 | /* |
1175 | * Allocate a filter and copy the given original filter. | |
1176 | * | |
1177 | * Return allocated filter or NULL on error. | |
1178 | */ | |
51755dc8 JG |
1179 | static struct lttng_filter_bytecode *copy_filter_bytecode( |
1180 | struct lttng_filter_bytecode *orig_f) | |
025faf73 | 1181 | { |
51755dc8 | 1182 | struct lttng_filter_bytecode *filter = NULL; |
025faf73 DG |
1183 | |
1184 | /* Copy filter bytecode */ | |
1185 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1186 | if (!filter) { | |
51755dc8 | 1187 | PERROR("zmalloc alloc filter bytecode"); |
025faf73 DG |
1188 | goto error; |
1189 | } | |
1190 | ||
1191 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1192 | ||
1193 | error: | |
1194 | return filter; | |
1195 | } | |
1196 | ||
51755dc8 JG |
1197 | /* |
1198 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1199 | * | |
1200 | * Return allocated filter or NULL on error. | |
1201 | */ | |
1202 | static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode( | |
1203 | struct lttng_filter_bytecode *orig_f) | |
1204 | { | |
1205 | struct lttng_ust_filter_bytecode *filter = NULL; | |
1206 | ||
1207 | /* Copy filter bytecode */ | |
1208 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1209 | if (!filter) { | |
1210 | PERROR("zmalloc alloc ust filter bytecode"); | |
1211 | goto error; | |
1212 | } | |
1213 | ||
1214 | assert(sizeof(struct lttng_filter_bytecode) == | |
1215 | sizeof(struct lttng_ust_filter_bytecode)); | |
1216 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1217 | error: | |
1218 | return filter; | |
1219 | } | |
1220 | ||
099e26bd | 1221 | /* |
421cb601 DG |
1222 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1223 | * held before calling this helper function. | |
099e26bd | 1224 | */ |
f20baf8e | 1225 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1226 | { |
bec39940 | 1227 | struct lttng_ht_node_ulong *node; |
bec39940 | 1228 | struct lttng_ht_iter iter; |
f6a9efaa | 1229 | |
852d0037 | 1230 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1231 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1232 | if (node == NULL) { |
1233 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1234 | goto error; |
1235 | } | |
852d0037 DG |
1236 | |
1237 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1238 | |
1239 | error: | |
1240 | return NULL; | |
099e26bd DG |
1241 | } |
1242 | ||
d0b96690 DG |
1243 | /* |
1244 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1245 | * be held before calling this helper function. | |
1246 | */ | |
1247 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1248 | { | |
1249 | struct lttng_ht_node_ulong *node; | |
1250 | struct lttng_ht_iter iter; | |
1251 | ||
1252 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1253 | &iter); | |
1254 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1255 | if (node == NULL) { | |
1256 | DBG2("UST app find by notify sock %d not found", sock); | |
1257 | goto error; | |
1258 | } | |
1259 | ||
1260 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1261 | ||
1262 | error: | |
1263 | return NULL; | |
1264 | } | |
1265 | ||
025faf73 DG |
1266 | /* |
1267 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1268 | * event loglevel. | |
1269 | * | |
1270 | * Return an ust_app_event object or NULL on error. | |
1271 | */ | |
18eace3b | 1272 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
88e3c2f5 | 1273 | const char *name, const struct lttng_filter_bytecode *filter, |
2106efa0 | 1274 | int loglevel_value, |
39c5a3a7 | 1275 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1276 | { |
1277 | struct lttng_ht_iter iter; | |
1278 | struct lttng_ht_node_str *node; | |
1279 | struct ust_app_event *event = NULL; | |
1280 | struct ust_app_ht_key key; | |
18eace3b DG |
1281 | |
1282 | assert(name); | |
1283 | assert(ht); | |
1284 | ||
1285 | /* Setup key for event lookup. */ | |
1286 | key.name = name; | |
1287 | key.filter = filter; | |
2106efa0 | 1288 | key.loglevel_type = loglevel_value; |
39c5a3a7 | 1289 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1290 | key.exclusion = exclusion; |
18eace3b | 1291 | |
025faf73 DG |
1292 | /* Lookup using the event name as hash and a custom match fct. */ |
1293 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1294 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1295 | node = lttng_ht_iter_get_node_str(&iter); |
1296 | if (node == NULL) { | |
1297 | goto end; | |
1298 | } | |
1299 | ||
1300 | event = caa_container_of(node, struct ust_app_event, node); | |
1301 | ||
1302 | end: | |
18eace3b DG |
1303 | return event; |
1304 | } | |
1305 | ||
55cc08a6 DG |
1306 | /* |
1307 | * Create the channel context on the tracer. | |
d0b96690 DG |
1308 | * |
1309 | * Called with UST app session lock held. | |
55cc08a6 DG |
1310 | */ |
1311 | static | |
1312 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1313 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1314 | { | |
1315 | int ret; | |
1316 | ||
840cb59c | 1317 | health_code_update(); |
86acf0da | 1318 | |
fb45065e | 1319 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1320 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1321 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1322 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1323 | if (ret < 0) { |
ffe60014 DG |
1324 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1325 | ERR("UST app create channel context failed for app (pid: %d) " | |
1326 | "with ret %d", app->pid, ret); | |
1327 | } else { | |
3757b385 DG |
1328 | /* |
1329 | * This is normal behavior, an application can die during the | |
1330 | * creation process. Don't report an error so the execution can | |
1331 | * continue normally. | |
1332 | */ | |
1333 | ret = 0; | |
88e3c2f5 | 1334 | DBG3("UST app add context failed. Application is dead."); |
ffe60014 | 1335 | } |
55cc08a6 DG |
1336 | goto error; |
1337 | } | |
1338 | ||
1339 | ua_ctx->handle = ua_ctx->obj->handle; | |
1340 | ||
d0b96690 DG |
1341 | DBG2("UST app context handle %d created successfully for channel %s", |
1342 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1343 | |
1344 | error: | |
840cb59c | 1345 | health_code_update(); |
55cc08a6 DG |
1346 | return ret; |
1347 | } | |
1348 | ||
53a80697 MD |
1349 | /* |
1350 | * Set the filter on the tracer. | |
1351 | */ | |
1352 | static | |
1353 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1354 | struct ust_app *app) | |
1355 | { | |
1356 | int ret; | |
51755dc8 | 1357 | struct lttng_ust_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1358 | |
840cb59c | 1359 | health_code_update(); |
86acf0da | 1360 | |
53a80697 | 1361 | if (!ua_event->filter) { |
86acf0da DG |
1362 | ret = 0; |
1363 | goto error; | |
53a80697 MD |
1364 | } |
1365 | ||
51755dc8 JG |
1366 | ust_bytecode = create_ust_bytecode_from_bytecode(ua_event->filter); |
1367 | if (!ust_bytecode) { | |
1368 | ret = -LTTNG_ERR_NOMEM; | |
1369 | goto error; | |
1370 | } | |
fb45065e | 1371 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1372 | ret = ustctl_set_filter(app->sock, ust_bytecode, |
53a80697 | 1373 | ua_event->obj); |
fb45065e | 1374 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1375 | if (ret < 0) { |
ffe60014 DG |
1376 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1377 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1378 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1379 | } else { | |
3757b385 DG |
1380 | /* |
1381 | * This is normal behavior, an application can die during the | |
1382 | * creation process. Don't report an error so the execution can | |
1383 | * continue normally. | |
1384 | */ | |
1385 | ret = 0; | |
ffe60014 DG |
1386 | DBG3("UST app filter event failed. Application is dead."); |
1387 | } | |
53a80697 MD |
1388 | goto error; |
1389 | } | |
1390 | ||
1391 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1392 | ||
1393 | error: | |
840cb59c | 1394 | health_code_update(); |
51755dc8 | 1395 | free(ust_bytecode); |
53a80697 MD |
1396 | return ret; |
1397 | } | |
1398 | ||
51755dc8 JG |
1399 | static |
1400 | struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion( | |
1401 | struct lttng_event_exclusion *exclusion) | |
1402 | { | |
1403 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; | |
1404 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1405 | LTTNG_UST_SYM_NAME_LEN * exclusion->count; | |
1406 | ||
1407 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1408 | if (!ust_exclusion) { | |
1409 | PERROR("malloc"); | |
1410 | goto end; | |
1411 | } | |
1412 | ||
1413 | assert(sizeof(struct lttng_event_exclusion) == | |
1414 | sizeof(struct lttng_ust_event_exclusion)); | |
1415 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); | |
1416 | end: | |
1417 | return ust_exclusion; | |
1418 | } | |
1419 | ||
7cc9a73c JI |
1420 | /* |
1421 | * Set event exclusions on the tracer. | |
1422 | */ | |
1423 | static | |
1424 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1425 | struct ust_app *app) | |
1426 | { | |
1427 | int ret; | |
51755dc8 | 1428 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; |
7cc9a73c JI |
1429 | |
1430 | health_code_update(); | |
1431 | ||
1432 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1433 | ret = 0; | |
1434 | goto error; | |
1435 | } | |
1436 | ||
51755dc8 JG |
1437 | ust_exclusion = create_ust_exclusion_from_exclusion( |
1438 | ua_event->exclusion); | |
1439 | if (!ust_exclusion) { | |
1440 | ret = -LTTNG_ERR_NOMEM; | |
1441 | goto error; | |
1442 | } | |
fb45065e | 1443 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1444 | ret = ustctl_set_exclusion(app->sock, ust_exclusion, ua_event->obj); |
fb45065e | 1445 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c JI |
1446 | if (ret < 0) { |
1447 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1448 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1449 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1450 | } else { | |
1451 | /* | |
1452 | * This is normal behavior, an application can die during the | |
1453 | * creation process. Don't report an error so the execution can | |
1454 | * continue normally. | |
1455 | */ | |
1456 | ret = 0; | |
1457 | DBG3("UST app event exclusion failed. Application is dead."); | |
1458 | } | |
1459 | goto error; | |
1460 | } | |
1461 | ||
1462 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1463 | ||
1464 | error: | |
1465 | health_code_update(); | |
51755dc8 | 1466 | free(ust_exclusion); |
7cc9a73c JI |
1467 | return ret; |
1468 | } | |
1469 | ||
9730260e DG |
1470 | /* |
1471 | * Disable the specified event on to UST tracer for the UST session. | |
1472 | */ | |
1473 | static int disable_ust_event(struct ust_app *app, | |
1474 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1475 | { | |
1476 | int ret; | |
1477 | ||
840cb59c | 1478 | health_code_update(); |
86acf0da | 1479 | |
fb45065e | 1480 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1481 | ret = ustctl_disable(app->sock, ua_event->obj); |
fb45065e | 1482 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1483 | if (ret < 0) { |
ffe60014 DG |
1484 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1485 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1486 | "and session handle %d with ret %d", | |
1487 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1488 | } else { | |
3757b385 DG |
1489 | /* |
1490 | * This is normal behavior, an application can die during the | |
1491 | * creation process. Don't report an error so the execution can | |
1492 | * continue normally. | |
1493 | */ | |
1494 | ret = 0; | |
ffe60014 DG |
1495 | DBG3("UST app disable event failed. Application is dead."); |
1496 | } | |
9730260e DG |
1497 | goto error; |
1498 | } | |
1499 | ||
1500 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1501 | ua_event->attr.name, app->pid); |
9730260e DG |
1502 | |
1503 | error: | |
840cb59c | 1504 | health_code_update(); |
9730260e DG |
1505 | return ret; |
1506 | } | |
1507 | ||
78f0bacd DG |
1508 | /* |
1509 | * Disable the specified channel on to UST tracer for the UST session. | |
1510 | */ | |
1511 | static int disable_ust_channel(struct ust_app *app, | |
1512 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1513 | { | |
1514 | int ret; | |
1515 | ||
840cb59c | 1516 | health_code_update(); |
86acf0da | 1517 | |
fb45065e | 1518 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1519 | ret = ustctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1520 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1521 | if (ret < 0) { |
ffe60014 DG |
1522 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1523 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1524 | "and session handle %d with ret %d", | |
1525 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1526 | } else { | |
3757b385 DG |
1527 | /* |
1528 | * This is normal behavior, an application can die during the | |
1529 | * creation process. Don't report an error so the execution can | |
1530 | * continue normally. | |
1531 | */ | |
1532 | ret = 0; | |
ffe60014 DG |
1533 | DBG3("UST app disable channel failed. Application is dead."); |
1534 | } | |
78f0bacd DG |
1535 | goto error; |
1536 | } | |
1537 | ||
78f0bacd | 1538 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1539 | ua_chan->name, app->pid); |
78f0bacd DG |
1540 | |
1541 | error: | |
840cb59c | 1542 | health_code_update(); |
78f0bacd DG |
1543 | return ret; |
1544 | } | |
1545 | ||
1546 | /* | |
1547 | * Enable the specified channel on to UST tracer for the UST session. | |
1548 | */ | |
1549 | static int enable_ust_channel(struct ust_app *app, | |
1550 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1551 | { | |
1552 | int ret; | |
1553 | ||
840cb59c | 1554 | health_code_update(); |
86acf0da | 1555 | |
fb45065e | 1556 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1557 | ret = ustctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1558 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1559 | if (ret < 0) { |
ffe60014 DG |
1560 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1561 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1562 | "and session handle %d with ret %d", | |
1563 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1564 | } else { | |
3757b385 DG |
1565 | /* |
1566 | * This is normal behavior, an application can die during the | |
1567 | * creation process. Don't report an error so the execution can | |
1568 | * continue normally. | |
1569 | */ | |
1570 | ret = 0; | |
ffe60014 DG |
1571 | DBG3("UST app enable channel failed. Application is dead."); |
1572 | } | |
78f0bacd DG |
1573 | goto error; |
1574 | } | |
1575 | ||
1576 | ua_chan->enabled = 1; | |
1577 | ||
1578 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1579 | ua_chan->name, app->pid); |
78f0bacd DG |
1580 | |
1581 | error: | |
840cb59c | 1582 | health_code_update(); |
78f0bacd DG |
1583 | return ret; |
1584 | } | |
1585 | ||
edb67388 DG |
1586 | /* |
1587 | * Enable the specified event on to UST tracer for the UST session. | |
1588 | */ | |
1589 | static int enable_ust_event(struct ust_app *app, | |
1590 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1591 | { | |
1592 | int ret; | |
1593 | ||
840cb59c | 1594 | health_code_update(); |
86acf0da | 1595 | |
fb45065e | 1596 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1597 | ret = ustctl_enable(app->sock, ua_event->obj); |
fb45065e | 1598 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1599 | if (ret < 0) { |
ffe60014 DG |
1600 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1601 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1602 | "and session handle %d with ret %d", | |
1603 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1604 | } else { | |
3757b385 DG |
1605 | /* |
1606 | * This is normal behavior, an application can die during the | |
1607 | * creation process. Don't report an error so the execution can | |
1608 | * continue normally. | |
1609 | */ | |
1610 | ret = 0; | |
ffe60014 DG |
1611 | DBG3("UST app enable event failed. Application is dead."); |
1612 | } | |
edb67388 DG |
1613 | goto error; |
1614 | } | |
1615 | ||
1616 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1617 | ua_event->attr.name, app->pid); |
edb67388 DG |
1618 | |
1619 | error: | |
840cb59c | 1620 | health_code_update(); |
edb67388 DG |
1621 | return ret; |
1622 | } | |
1623 | ||
099e26bd | 1624 | /* |
7972aab2 | 1625 | * Send channel and stream buffer to application. |
4f3ab6ee | 1626 | * |
ffe60014 | 1627 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1628 | */ |
7972aab2 DG |
1629 | static int send_channel_pid_to_ust(struct ust_app *app, |
1630 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1631 | { |
1632 | int ret; | |
ffe60014 | 1633 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1634 | |
1635 | assert(app); | |
ffe60014 | 1636 | assert(ua_sess); |
4f3ab6ee | 1637 | assert(ua_chan); |
4f3ab6ee | 1638 | |
840cb59c | 1639 | health_code_update(); |
4f3ab6ee | 1640 | |
7972aab2 DG |
1641 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1642 | app->sock); | |
86acf0da | 1643 | |
ffe60014 DG |
1644 | /* Send channel to the application. */ |
1645 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1646 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1647 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1648 | goto error; | |
1649 | } else if (ret < 0) { | |
b551a063 DG |
1650 | goto error; |
1651 | } | |
1652 | ||
d88aee68 DG |
1653 | health_code_update(); |
1654 | ||
ffe60014 DG |
1655 | /* Send all streams to application. */ |
1656 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1657 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1658 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1659 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1660 | goto error; | |
1661 | } else if (ret < 0) { | |
ffe60014 DG |
1662 | goto error; |
1663 | } | |
1664 | /* We don't need the stream anymore once sent to the tracer. */ | |
1665 | cds_list_del(&stream->list); | |
fb45065e | 1666 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1667 | } |
ffe60014 DG |
1668 | /* Flag the channel that it is sent to the application. */ |
1669 | ua_chan->is_sent = 1; | |
ffe60014 | 1670 | |
b551a063 | 1671 | error: |
840cb59c | 1672 | health_code_update(); |
b551a063 DG |
1673 | return ret; |
1674 | } | |
1675 | ||
91d76f53 | 1676 | /* |
5b4a0ec0 | 1677 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1678 | * |
1679 | * Should be called with session mutex held. | |
91d76f53 | 1680 | */ |
edb67388 DG |
1681 | static |
1682 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1683 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1684 | { |
5b4a0ec0 | 1685 | int ret = 0; |
284d8f55 | 1686 | |
840cb59c | 1687 | health_code_update(); |
86acf0da | 1688 | |
5b4a0ec0 | 1689 | /* Create UST event on tracer */ |
fb45065e | 1690 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1691 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 1692 | &ua_event->obj); |
fb45065e | 1693 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 1694 | if (ret < 0) { |
ffe60014 | 1695 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
88e3c2f5 | 1696 | abort(); |
ffe60014 DG |
1697 | ERR("Error ustctl create event %s for app pid: %d with ret %d", |
1698 | ua_event->attr.name, app->pid, ret); | |
1699 | } else { | |
3757b385 DG |
1700 | /* |
1701 | * This is normal behavior, an application can die during the | |
1702 | * creation process. Don't report an error so the execution can | |
1703 | * continue normally. | |
1704 | */ | |
1705 | ret = 0; | |
ffe60014 DG |
1706 | DBG3("UST app create event failed. Application is dead."); |
1707 | } | |
5b4a0ec0 | 1708 | goto error; |
91d76f53 | 1709 | } |
f6a9efaa | 1710 | |
5b4a0ec0 | 1711 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1712 | |
5b4a0ec0 | 1713 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1714 | ua_event->attr.name, app->pid); |
f6a9efaa | 1715 | |
840cb59c | 1716 | health_code_update(); |
86acf0da | 1717 | |
025faf73 DG |
1718 | /* Set filter if one is present. */ |
1719 | if (ua_event->filter) { | |
1720 | ret = set_ust_event_filter(ua_event, app); | |
1721 | if (ret < 0) { | |
1722 | goto error; | |
1723 | } | |
1724 | } | |
1725 | ||
7cc9a73c JI |
1726 | /* Set exclusions for the event */ |
1727 | if (ua_event->exclusion) { | |
1728 | ret = set_ust_event_exclusion(ua_event, app); | |
1729 | if (ret < 0) { | |
1730 | goto error; | |
1731 | } | |
1732 | } | |
1733 | ||
8535a6d9 | 1734 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1735 | if (ua_event->enabled) { |
1736 | /* | |
1737 | * We now need to explicitly enable the event, since it | |
1738 | * is now disabled at creation. | |
1739 | */ | |
1740 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1741 | if (ret < 0) { | |
1742 | /* | |
1743 | * If we hit an EPERM, something is wrong with our enable call. If | |
1744 | * we get an EEXIST, there is a problem on the tracer side since we | |
1745 | * just created it. | |
1746 | */ | |
1747 | switch (ret) { | |
1748 | case -LTTNG_UST_ERR_PERM: | |
1749 | /* Code flow problem */ | |
1750 | assert(0); | |
1751 | case -LTTNG_UST_ERR_EXIST: | |
1752 | /* It's OK for our use case. */ | |
1753 | ret = 0; | |
1754 | break; | |
1755 | default: | |
1756 | break; | |
1757 | } | |
1758 | goto error; | |
1759 | } | |
8535a6d9 DG |
1760 | } |
1761 | ||
5b4a0ec0 | 1762 | error: |
840cb59c | 1763 | health_code_update(); |
5b4a0ec0 | 1764 | return ret; |
91d76f53 | 1765 | } |
48842b30 | 1766 | |
5b4a0ec0 DG |
1767 | /* |
1768 | * Copy data between an UST app event and a LTT event. | |
1769 | */ | |
421cb601 | 1770 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1771 | struct ltt_ust_event *uevent) |
1772 | { | |
b4ffad32 JI |
1773 | size_t exclusion_alloc_size; |
1774 | ||
48842b30 DG |
1775 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1776 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1777 | ||
fc34caaa DG |
1778 | ua_event->enabled = uevent->enabled; |
1779 | ||
5b4a0ec0 DG |
1780 | /* Copy event attributes */ |
1781 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1782 | ||
53a80697 MD |
1783 | /* Copy filter bytecode */ |
1784 | if (uevent->filter) { | |
51755dc8 | 1785 | ua_event->filter = copy_filter_bytecode(uevent->filter); |
025faf73 | 1786 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 1787 | } |
b4ffad32 JI |
1788 | |
1789 | /* Copy exclusion data */ | |
1790 | if (uevent->exclusion) { | |
51755dc8 | 1791 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
b4ffad32 JI |
1792 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; |
1793 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1794 | if (ua_event->exclusion == NULL) { |
1795 | PERROR("malloc"); | |
1796 | } else { | |
1797 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1798 | exclusion_alloc_size); | |
b4ffad32 JI |
1799 | } |
1800 | } | |
48842b30 DG |
1801 | } |
1802 | ||
5b4a0ec0 DG |
1803 | /* |
1804 | * Copy data between an UST app channel and a LTT channel. | |
1805 | */ | |
421cb601 | 1806 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1807 | struct ltt_ust_channel *uchan) |
1808 | { | |
fc34caaa | 1809 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1810 | |
1811 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1812 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1813 | |
1624d5b7 JD |
1814 | ua_chan->tracefile_size = uchan->tracefile_size; |
1815 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1816 | ||
ffe60014 DG |
1817 | /* Copy event attributes since the layout is different. */ |
1818 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1819 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1820 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1821 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1822 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
e9404c27 | 1823 | ua_chan->monitor_timer_interval = uchan->monitor_timer_interval; |
ffe60014 | 1824 | ua_chan->attr.output = uchan->attr.output; |
491d1539 MD |
1825 | ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout; |
1826 | ||
ffe60014 DG |
1827 | /* |
1828 | * Note that the attribute channel type is not set since the channel on the | |
1829 | * tracing registry side does not have this information. | |
1830 | */ | |
48842b30 | 1831 | |
fc34caaa | 1832 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1833 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1834 | |
fc34caaa | 1835 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1836 | } |
1837 | ||
5b4a0ec0 DG |
1838 | /* |
1839 | * Copy data between a UST app session and a regular LTT session. | |
1840 | */ | |
421cb601 | 1841 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1842 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1843 | { |
477d7741 MD |
1844 | struct tm *timeinfo; |
1845 | char datetime[16]; | |
1846 | int ret; | |
d7ba1388 | 1847 | char tmp_shm_path[PATH_MAX]; |
477d7741 | 1848 | |
940c4592 | 1849 | timeinfo = localtime(&app->registration_time); |
477d7741 | 1850 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); |
48842b30 | 1851 | |
421cb601 | 1852 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1853 | |
7972aab2 DG |
1854 | ua_sess->tracing_id = usess->id; |
1855 | ua_sess->id = get_next_session_id(); | |
470cc211 JG |
1856 | ua_sess->real_credentials.uid = app->uid; |
1857 | ua_sess->real_credentials.gid = app->gid; | |
1858 | ua_sess->effective_credentials.uid = usess->uid; | |
1859 | ua_sess->effective_credentials.gid = usess->gid; | |
7972aab2 DG |
1860 | ua_sess->buffer_type = usess->buffer_type; |
1861 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 1862 | |
7972aab2 | 1863 | /* There is only one consumer object per session possible. */ |
6addfa37 | 1864 | consumer_output_get(usess->consumer); |
7972aab2 | 1865 | ua_sess->consumer = usess->consumer; |
6addfa37 | 1866 | |
2bba9e53 | 1867 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1868 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1869 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1870 | &usess->metadata_attr); | |
7972aab2 DG |
1871 | |
1872 | switch (ua_sess->buffer_type) { | |
1873 | case LTTNG_BUFFER_PER_PID: | |
1874 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1875 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1876 | datetime); |
1877 | break; | |
1878 | case LTTNG_BUFFER_PER_UID: | |
1879 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
470cc211 JG |
1880 | DEFAULT_UST_TRACE_UID_PATH, |
1881 | ua_sess->real_credentials.uid, | |
1882 | app->bits_per_long); | |
7972aab2 DG |
1883 | break; |
1884 | default: | |
1885 | assert(0); | |
1886 | goto error; | |
1887 | } | |
477d7741 MD |
1888 | if (ret < 0) { |
1889 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1890 | assert(0); |
7972aab2 | 1891 | goto error; |
477d7741 MD |
1892 | } |
1893 | ||
3d071855 MD |
1894 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
1895 | sizeof(ua_sess->root_shm_path)); | |
1896 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
1897 | strncpy(ua_sess->shm_path, usess->shm_path, |
1898 | sizeof(ua_sess->shm_path)); | |
1899 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1900 | if (ua_sess->shm_path[0]) { | |
1901 | switch (ua_sess->buffer_type) { | |
1902 | case LTTNG_BUFFER_PER_PID: | |
1903 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1904 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", | |
1905 | app->name, app->pid, datetime); | |
1906 | break; | |
1907 | case LTTNG_BUFFER_PER_UID: | |
1908 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1909 | DEFAULT_UST_TRACE_UID_PATH, | |
1910 | app->uid, app->bits_per_long); | |
1911 | break; | |
1912 | default: | |
1913 | assert(0); | |
1914 | goto error; | |
1915 | } | |
1916 | if (ret < 0) { | |
1917 | PERROR("sprintf UST shadow copy session"); | |
1918 | assert(0); | |
1919 | goto error; | |
1920 | } | |
1921 | strncat(ua_sess->shm_path, tmp_shm_path, | |
1922 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
1923 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1924 | } | |
6addfa37 | 1925 | return; |
7972aab2 DG |
1926 | |
1927 | error: | |
6addfa37 | 1928 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
1929 | } |
1930 | ||
78f0bacd DG |
1931 | /* |
1932 | * Lookup sesison wrapper. | |
1933 | */ | |
84cd17c6 | 1934 | static |
fb9a95c4 | 1935 | void __lookup_session_by_app(const struct ltt_ust_session *usess, |
bec39940 | 1936 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1937 | { |
1938 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1939 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1940 | } |
1941 | ||
421cb601 DG |
1942 | /* |
1943 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1944 | * id. |
421cb601 | 1945 | */ |
48842b30 | 1946 | static struct ust_app_session *lookup_session_by_app( |
fb9a95c4 | 1947 | const struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1948 | { |
bec39940 | 1949 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1950 | struct lttng_ht_node_u64 *node; |
48842b30 | 1951 | |
84cd17c6 | 1952 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1953 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1954 | if (node == NULL) { |
1955 | goto error; | |
1956 | } | |
1957 | ||
1958 | return caa_container_of(node, struct ust_app_session, node); | |
1959 | ||
1960 | error: | |
1961 | return NULL; | |
1962 | } | |
1963 | ||
7972aab2 DG |
1964 | /* |
1965 | * Setup buffer registry per PID for the given session and application. If none | |
1966 | * is found, a new one is created, added to the global registry and | |
1967 | * initialized. If regp is valid, it's set with the newly created object. | |
1968 | * | |
1969 | * Return 0 on success or else a negative value. | |
1970 | */ | |
1971 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1972 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1973 | { | |
1974 | int ret = 0; | |
1975 | struct buffer_reg_pid *reg_pid; | |
1976 | ||
1977 | assert(ua_sess); | |
1978 | assert(app); | |
1979 | ||
1980 | rcu_read_lock(); | |
1981 | ||
1982 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1983 | if (!reg_pid) { | |
1984 | /* | |
1985 | * This is the create channel path meaning that if there is NO | |
1986 | * registry available, we have to create one for this session. | |
1987 | */ | |
d7ba1388 | 1988 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 1989 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
1990 | if (ret < 0) { |
1991 | goto error; | |
1992 | } | |
7972aab2 DG |
1993 | } else { |
1994 | goto end; | |
1995 | } | |
1996 | ||
1997 | /* Initialize registry. */ | |
1998 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1999 | app->bits_per_long, app->uint8_t_alignment, | |
2000 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf | 2001 | app->uint64_t_alignment, app->long_alignment, |
470cc211 JG |
2002 | app->byte_order, app->version.major, app->version.minor, |
2003 | reg_pid->root_shm_path, reg_pid->shm_path, | |
2004 | ua_sess->effective_credentials.uid, | |
8de88061 JR |
2005 | ua_sess->effective_credentials.gid, ua_sess->tracing_id, |
2006 | app->uid); | |
7972aab2 | 2007 | if (ret < 0) { |
286c991a MD |
2008 | /* |
2009 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2010 | * destroy the buffer registry, because it is always expected | |
2011 | * that if the buffer registry can be found, its ust registry is | |
2012 | * non-NULL. | |
2013 | */ | |
2014 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2015 | goto error; |
2016 | } | |
2017 | ||
286c991a MD |
2018 | buffer_reg_pid_add(reg_pid); |
2019 | ||
7972aab2 DG |
2020 | DBG3("UST app buffer registry per PID created successfully"); |
2021 | ||
2022 | end: | |
2023 | if (regp) { | |
2024 | *regp = reg_pid; | |
2025 | } | |
2026 | error: | |
2027 | rcu_read_unlock(); | |
2028 | return ret; | |
2029 | } | |
2030 | ||
2031 | /* | |
2032 | * Setup buffer registry per UID for the given session and application. If none | |
2033 | * is found, a new one is created, added to the global registry and | |
2034 | * initialized. If regp is valid, it's set with the newly created object. | |
2035 | * | |
2036 | * Return 0 on success or else a negative value. | |
2037 | */ | |
2038 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2039 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2040 | struct ust_app *app, struct buffer_reg_uid **regp) |
2041 | { | |
2042 | int ret = 0; | |
2043 | struct buffer_reg_uid *reg_uid; | |
2044 | ||
2045 | assert(usess); | |
2046 | assert(app); | |
2047 | ||
2048 | rcu_read_lock(); | |
2049 | ||
2050 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2051 | if (!reg_uid) { | |
2052 | /* | |
2053 | * This is the create channel path meaning that if there is NO | |
2054 | * registry available, we have to create one for this session. | |
2055 | */ | |
2056 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2057 | LTTNG_DOMAIN_UST, ®_uid, |
2058 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2059 | if (ret < 0) { |
2060 | goto error; | |
2061 | } | |
7972aab2 DG |
2062 | } else { |
2063 | goto end; | |
2064 | } | |
2065 | ||
2066 | /* Initialize registry. */ | |
af6142cf | 2067 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2068 | app->bits_per_long, app->uint8_t_alignment, |
2069 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2070 | app->uint64_t_alignment, app->long_alignment, |
2071 | app->byte_order, app->version.major, | |
3d071855 | 2072 | app->version.minor, reg_uid->root_shm_path, |
8de88061 JR |
2073 | reg_uid->shm_path, usess->uid, usess->gid, |
2074 | ua_sess->tracing_id, app->uid); | |
7972aab2 | 2075 | if (ret < 0) { |
286c991a MD |
2076 | /* |
2077 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2078 | * destroy the buffer registry, because it is always expected | |
2079 | * that if the buffer registry can be found, its ust registry is | |
2080 | * non-NULL. | |
2081 | */ | |
2082 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2083 | goto error; |
2084 | } | |
2085 | /* Add node to teardown list of the session. */ | |
2086 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2087 | ||
286c991a | 2088 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2089 | |
286c991a | 2090 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2091 | end: |
2092 | if (regp) { | |
2093 | *regp = reg_uid; | |
2094 | } | |
2095 | error: | |
2096 | rcu_read_unlock(); | |
2097 | return ret; | |
2098 | } | |
2099 | ||
421cb601 | 2100 | /* |
3d8ca23b | 2101 | * Create a session on the tracer side for the given app. |
421cb601 | 2102 | * |
3d8ca23b DG |
2103 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2104 | * untouched. If the session was created, is_created is set to 1. On error, | |
2105 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2106 | * be NULL. | |
2107 | * | |
2108 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2109 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2110 | */ |
03f91eaa | 2111 | static int find_or_create_ust_app_session(struct ltt_ust_session *usess, |
3d8ca23b DG |
2112 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, |
2113 | int *is_created) | |
421cb601 | 2114 | { |
3d8ca23b | 2115 | int ret, created = 0; |
421cb601 DG |
2116 | struct ust_app_session *ua_sess; |
2117 | ||
3d8ca23b DG |
2118 | assert(usess); |
2119 | assert(app); | |
2120 | assert(ua_sess_ptr); | |
2121 | ||
840cb59c | 2122 | health_code_update(); |
86acf0da | 2123 | |
421cb601 DG |
2124 | ua_sess = lookup_session_by_app(usess, app); |
2125 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2126 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2127 | app->pid, usess->id); |
40bbd087 | 2128 | ua_sess = alloc_ust_app_session(); |
421cb601 DG |
2129 | if (ua_sess == NULL) { |
2130 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2131 | ret = -ENOMEM; |
2132 | goto error; | |
421cb601 | 2133 | } |
477d7741 | 2134 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2135 | created = 1; |
421cb601 DG |
2136 | } |
2137 | ||
7972aab2 DG |
2138 | switch (usess->buffer_type) { |
2139 | case LTTNG_BUFFER_PER_PID: | |
2140 | /* Init local registry. */ | |
2141 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2142 | if (ret < 0) { |
e64207cf | 2143 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2144 | goto error; |
2145 | } | |
2146 | break; | |
2147 | case LTTNG_BUFFER_PER_UID: | |
2148 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2149 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2150 | if (ret < 0) { |
e64207cf | 2151 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2152 | goto error; |
2153 | } | |
2154 | break; | |
2155 | default: | |
2156 | assert(0); | |
2157 | ret = -EINVAL; | |
2158 | goto error; | |
2159 | } | |
2160 | ||
2161 | health_code_update(); | |
2162 | ||
2163 | if (ua_sess->handle == -1) { | |
fb45065e | 2164 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2165 | ret = ustctl_create_session(app->sock); |
fb45065e | 2166 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2167 | if (ret < 0) { |
2168 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2169 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2170 | app->pid, ret); |
2171 | } else { | |
2172 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2173 | /* |
2174 | * This is normal behavior, an application can die during the | |
2175 | * creation process. Don't report an error so the execution can | |
2176 | * continue normally. This will get flagged ENOTCONN and the | |
2177 | * caller will handle it. | |
2178 | */ | |
2179 | ret = 0; | |
ffe60014 | 2180 | } |
d0b96690 | 2181 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2182 | if (ret != -ENOMEM) { |
2183 | /* | |
2184 | * Tracer is probably gone or got an internal error so let's | |
2185 | * behave like it will soon unregister or not usable. | |
2186 | */ | |
2187 | ret = -ENOTCONN; | |
2188 | } | |
2189 | goto error; | |
421cb601 DG |
2190 | } |
2191 | ||
7972aab2 DG |
2192 | ua_sess->handle = ret; |
2193 | ||
2194 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2195 | lttng_ht_node_init_u64(&ua_sess->node, |
2196 | ua_sess->tracing_id); | |
2197 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2198 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2199 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2200 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2201 | |
2202 | DBG2("UST app session created successfully with handle %d", ret); | |
2203 | } | |
2204 | ||
2205 | *ua_sess_ptr = ua_sess; | |
2206 | if (is_created) { | |
2207 | *is_created = created; | |
2208 | } | |
2209 | ||
2210 | /* Everything went well. */ | |
2211 | ret = 0; | |
2212 | ||
2213 | error: | |
2214 | health_code_update(); | |
2215 | return ret; | |
2216 | } | |
2217 | ||
6a6b2068 JG |
2218 | /* |
2219 | * Match function for a hash table lookup of ust_app_ctx. | |
2220 | * | |
2221 | * It matches an ust app context based on the context type and, in the case | |
2222 | * of perf counters, their name. | |
2223 | */ | |
2224 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2225 | { | |
2226 | struct ust_app_ctx *ctx; | |
bdf64013 | 2227 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2228 | |
2229 | assert(node); | |
2230 | assert(_key); | |
2231 | ||
2232 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2233 | key = _key; | |
2234 | ||
2235 | /* Context type */ | |
2236 | if (ctx->ctx.ctx != key->ctx) { | |
2237 | goto no_match; | |
2238 | } | |
2239 | ||
bdf64013 JG |
2240 | switch(key->ctx) { |
2241 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: | |
6a6b2068 | 2242 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2243 | ctx->ctx.u.perf_counter.name, |
2244 | sizeof(key->u.perf_counter.name))) { | |
2245 | goto no_match; | |
2246 | } | |
2247 | break; | |
2248 | case LTTNG_UST_CONTEXT_APP_CONTEXT: | |
2249 | if (strcmp(key->u.app_ctx.provider_name, | |
2250 | ctx->ctx.u.app_ctx.provider_name) || | |
2251 | strcmp(key->u.app_ctx.ctx_name, | |
2252 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2253 | goto no_match; |
2254 | } | |
bdf64013 JG |
2255 | break; |
2256 | default: | |
2257 | break; | |
6a6b2068 JG |
2258 | } |
2259 | ||
2260 | /* Match. */ | |
2261 | return 1; | |
2262 | ||
2263 | no_match: | |
2264 | return 0; | |
2265 | } | |
2266 | ||
2267 | /* | |
2268 | * Lookup for an ust app context from an lttng_ust_context. | |
2269 | * | |
be184a0f | 2270 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2271 | * Return an ust_app_ctx object or NULL on error. |
2272 | */ | |
2273 | static | |
2274 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2275 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2276 | { |
2277 | struct lttng_ht_iter iter; | |
2278 | struct lttng_ht_node_ulong *node; | |
2279 | struct ust_app_ctx *app_ctx = NULL; | |
2280 | ||
2281 | assert(uctx); | |
2282 | assert(ht); | |
2283 | ||
2284 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2285 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2286 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2287 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2288 | if (!node) { | |
2289 | goto end; | |
2290 | } | |
2291 | ||
2292 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2293 | ||
2294 | end: | |
2295 | return app_ctx; | |
2296 | } | |
2297 | ||
7972aab2 DG |
2298 | /* |
2299 | * Create a context for the channel on the tracer. | |
2300 | * | |
2301 | * Called with UST app session lock held and a RCU read side lock. | |
2302 | */ | |
2303 | static | |
c9edf082 | 2304 | int create_ust_app_channel_context(struct ust_app_channel *ua_chan, |
bdf64013 | 2305 | struct lttng_ust_context_attr *uctx, |
7972aab2 DG |
2306 | struct ust_app *app) |
2307 | { | |
2308 | int ret = 0; | |
7972aab2 DG |
2309 | struct ust_app_ctx *ua_ctx; |
2310 | ||
2311 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2312 | ||
6a6b2068 JG |
2313 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2314 | if (ua_ctx) { | |
7972aab2 DG |
2315 | ret = -EEXIST; |
2316 | goto error; | |
2317 | } | |
2318 | ||
2319 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2320 | if (ua_ctx == NULL) { | |
2321 | /* malloc failed */ | |
7682f304 | 2322 | ret = -ENOMEM; |
7972aab2 DG |
2323 | goto error; |
2324 | } | |
2325 | ||
2326 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2327 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2328 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2329 | |
2330 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2331 | if (ret < 0) { | |
2332 | goto error; | |
2333 | } | |
2334 | ||
2335 | error: | |
2336 | return ret; | |
2337 | } | |
2338 | ||
2339 | /* | |
2340 | * Enable on the tracer side a ust app event for the session and channel. | |
2341 | * | |
2342 | * Called with UST app session lock held. | |
2343 | */ | |
2344 | static | |
2345 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2346 | struct ust_app_event *ua_event, struct ust_app *app) | |
2347 | { | |
2348 | int ret; | |
2349 | ||
2350 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2351 | if (ret < 0) { | |
2352 | goto error; | |
2353 | } | |
2354 | ||
2355 | ua_event->enabled = 1; | |
2356 | ||
2357 | error: | |
2358 | return ret; | |
2359 | } | |
2360 | ||
2361 | /* | |
2362 | * Disable on the tracer side a ust app event for the session and channel. | |
2363 | */ | |
2364 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2365 | struct ust_app_event *ua_event, struct ust_app *app) | |
2366 | { | |
2367 | int ret; | |
2368 | ||
2369 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2370 | if (ret < 0) { | |
2371 | goto error; | |
2372 | } | |
2373 | ||
2374 | ua_event->enabled = 0; | |
2375 | ||
2376 | error: | |
2377 | return ret; | |
2378 | } | |
2379 | ||
2380 | /* | |
2381 | * Lookup ust app channel for session and disable it on the tracer side. | |
2382 | */ | |
2383 | static | |
2384 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2385 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2386 | { | |
2387 | int ret; | |
2388 | ||
2389 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2390 | if (ret < 0) { | |
2391 | goto error; | |
2392 | } | |
2393 | ||
2394 | ua_chan->enabled = 0; | |
2395 | ||
2396 | error: | |
2397 | return ret; | |
2398 | } | |
2399 | ||
2400 | /* | |
2401 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2402 | * MUST be called with a RCU read side lock acquired. | |
2403 | */ | |
2404 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2405 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2406 | { | |
2407 | int ret = 0; | |
2408 | struct lttng_ht_iter iter; | |
2409 | struct lttng_ht_node_str *ua_chan_node; | |
2410 | struct ust_app_channel *ua_chan; | |
2411 | ||
2412 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2413 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2414 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2415 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2416 | uchan->name, ua_sess->tracing_id); |
2417 | goto error; | |
2418 | } | |
2419 | ||
2420 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2421 | ||
2422 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2423 | if (ret < 0) { | |
2424 | goto error; | |
2425 | } | |
2426 | ||
2427 | error: | |
2428 | return ret; | |
2429 | } | |
2430 | ||
2431 | /* | |
2432 | * Ask the consumer to create a channel and get it if successful. | |
2433 | * | |
fad1ed2f JR |
2434 | * Called with UST app session lock held. |
2435 | * | |
7972aab2 DG |
2436 | * Return 0 on success or else a negative value. |
2437 | */ | |
2438 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2439 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
e098433c JG |
2440 | int bitness, struct ust_registry_session *registry, |
2441 | uint64_t trace_archive_id) | |
7972aab2 DG |
2442 | { |
2443 | int ret; | |
2444 | unsigned int nb_fd = 0; | |
2445 | struct consumer_socket *socket; | |
2446 | ||
2447 | assert(usess); | |
2448 | assert(ua_sess); | |
2449 | assert(ua_chan); | |
2450 | assert(registry); | |
2451 | ||
2452 | rcu_read_lock(); | |
2453 | health_code_update(); | |
2454 | ||
2455 | /* Get the right consumer socket for the application. */ | |
2456 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2457 | if (!socket) { | |
2458 | ret = -EINVAL; | |
2459 | goto error; | |
2460 | } | |
2461 | ||
2462 | health_code_update(); | |
2463 | ||
2464 | /* Need one fd for the channel. */ | |
2465 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2466 | if (ret < 0) { | |
2467 | ERR("Exhausted number of available FD upon create channel"); | |
2468 | goto error; | |
2469 | } | |
2470 | ||
2471 | /* | |
2472 | * Ask consumer to create channel. The consumer will return the number of | |
2473 | * stream we have to expect. | |
2474 | */ | |
2475 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
d2956687 | 2476 | registry, usess->current_trace_chunk); |
7972aab2 DG |
2477 | if (ret < 0) { |
2478 | goto error_ask; | |
2479 | } | |
2480 | ||
2481 | /* | |
2482 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2483 | * stream (2 being the default value here). | |
2484 | */ | |
2485 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2486 | ||
2487 | /* Reserve the amount of file descriptor we need. */ | |
2488 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2489 | if (ret < 0) { | |
2490 | ERR("Exhausted number of available FD upon create channel"); | |
2491 | goto error_fd_get_stream; | |
2492 | } | |
2493 | ||
2494 | health_code_update(); | |
2495 | ||
2496 | /* | |
2497 | * Now get the channel from the consumer. This call wil populate the stream | |
2498 | * list of that channel and set the ust objects. | |
2499 | */ | |
d9078d0c DG |
2500 | if (usess->consumer->enabled) { |
2501 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2502 | if (ret < 0) { | |
2503 | goto error_destroy; | |
2504 | } | |
7972aab2 DG |
2505 | } |
2506 | ||
2507 | rcu_read_unlock(); | |
2508 | return 0; | |
2509 | ||
2510 | error_destroy: | |
2511 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2512 | error_fd_get_stream: | |
2513 | /* | |
2514 | * Initiate a destroy channel on the consumer since we had an error | |
2515 | * handling it on our side. The return value is of no importance since we | |
2516 | * already have a ret value set by the previous error that we need to | |
2517 | * return. | |
2518 | */ | |
2519 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2520 | error_ask: | |
2521 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2522 | error: | |
2523 | health_code_update(); | |
2524 | rcu_read_unlock(); | |
2525 | return ret; | |
2526 | } | |
2527 | ||
2528 | /* | |
2529 | * Duplicate the ust data object of the ust app stream and save it in the | |
2530 | * buffer registry stream. | |
2531 | * | |
2532 | * Return 0 on success or else a negative value. | |
2533 | */ | |
2534 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2535 | struct ust_app_stream *stream) | |
2536 | { | |
2537 | int ret; | |
2538 | ||
2539 | assert(reg_stream); | |
2540 | assert(stream); | |
2541 | ||
2542 | /* Reserve the amount of file descriptor we need. */ | |
2543 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2544 | if (ret < 0) { | |
2545 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2546 | goto error; | |
2547 | } | |
2548 | ||
2549 | /* Duplicate object for stream once the original is in the registry. */ | |
2550 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2551 | reg_stream->obj.ust); | |
2552 | if (ret < 0) { | |
2553 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2554 | reg_stream->obj.ust, stream->obj, ret); | |
2555 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2556 | goto error; | |
2557 | } | |
2558 | stream->handle = stream->obj->handle; | |
2559 | ||
2560 | error: | |
2561 | return ret; | |
2562 | } | |
2563 | ||
2564 | /* | |
2565 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2566 | * buffer registry channel. | |
2567 | * | |
2568 | * Return 0 on success or else a negative value. | |
2569 | */ | |
2570 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2571 | struct ust_app_channel *ua_chan) | |
2572 | { | |
2573 | int ret; | |
2574 | ||
2575 | assert(reg_chan); | |
2576 | assert(ua_chan); | |
2577 | ||
2578 | /* Need two fds for the channel. */ | |
2579 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2580 | if (ret < 0) { | |
2581 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2582 | goto error_fd_get; | |
2583 | } | |
2584 | ||
2585 | /* Duplicate object for stream once the original is in the registry. */ | |
2586 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2587 | if (ret < 0) { | |
2588 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2589 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2590 | goto error; | |
2591 | } | |
2592 | ua_chan->handle = ua_chan->obj->handle; | |
2593 | ||
2594 | return 0; | |
2595 | ||
2596 | error: | |
2597 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2598 | error_fd_get: | |
2599 | return ret; | |
2600 | } | |
2601 | ||
2602 | /* | |
2603 | * For a given channel buffer registry, setup all streams of the given ust | |
2604 | * application channel. | |
2605 | * | |
2606 | * Return 0 on success or else a negative value. | |
2607 | */ | |
2608 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
2609 | struct ust_app_channel *ua_chan, |
2610 | struct ust_app *app) | |
7972aab2 DG |
2611 | { |
2612 | int ret = 0; | |
2613 | struct ust_app_stream *stream, *stmp; | |
2614 | ||
2615 | assert(reg_chan); | |
2616 | assert(ua_chan); | |
2617 | ||
2618 | DBG2("UST app setup buffer registry stream"); | |
2619 | ||
2620 | /* Send all streams to application. */ | |
2621 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2622 | struct buffer_reg_stream *reg_stream; | |
2623 | ||
2624 | ret = buffer_reg_stream_create(®_stream); | |
2625 | if (ret < 0) { | |
2626 | goto error; | |
2627 | } | |
2628 | ||
2629 | /* | |
2630 | * Keep original pointer and nullify it in the stream so the delete | |
2631 | * stream call does not release the object. | |
2632 | */ | |
2633 | reg_stream->obj.ust = stream->obj; | |
2634 | stream->obj = NULL; | |
2635 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2636 | |
7972aab2 DG |
2637 | /* We don't need the streams anymore. */ |
2638 | cds_list_del(&stream->list); | |
fb45065e | 2639 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 2640 | } |
421cb601 | 2641 | |
7972aab2 DG |
2642 | error: |
2643 | return ret; | |
2644 | } | |
2645 | ||
2646 | /* | |
2647 | * Create a buffer registry channel for the given session registry and | |
2648 | * application channel object. If regp pointer is valid, it's set with the | |
2649 | * created object. Important, the created object is NOT added to the session | |
2650 | * registry hash table. | |
2651 | * | |
2652 | * Return 0 on success else a negative value. | |
2653 | */ | |
2654 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2655 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2656 | { | |
2657 | int ret; | |
2658 | struct buffer_reg_channel *reg_chan = NULL; | |
2659 | ||
2660 | assert(reg_sess); | |
2661 | assert(ua_chan); | |
2662 | ||
2663 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2664 | ||
2665 | /* Create buffer registry channel. */ | |
2666 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2667 | if (ret < 0) { | |
2668 | goto error_create; | |
421cb601 | 2669 | } |
7972aab2 DG |
2670 | assert(reg_chan); |
2671 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2672 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 2673 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2674 | |
7972aab2 DG |
2675 | /* Create and add a channel registry to session. */ |
2676 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2677 | ua_chan->tracing_channel_id); | |
2678 | if (ret < 0) { | |
2679 | goto error; | |
d88aee68 | 2680 | } |
7972aab2 | 2681 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2682 | |
7972aab2 DG |
2683 | if (regp) { |
2684 | *regp = reg_chan; | |
3d8ca23b | 2685 | } |
d88aee68 | 2686 | |
7972aab2 | 2687 | return 0; |
3d8ca23b DG |
2688 | |
2689 | error: | |
7972aab2 DG |
2690 | /* Safe because the registry channel object was not added to any HT. */ |
2691 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2692 | error_create: | |
3d8ca23b | 2693 | return ret; |
421cb601 DG |
2694 | } |
2695 | ||
55cc08a6 | 2696 | /* |
7972aab2 DG |
2697 | * Setup buffer registry channel for the given session registry and application |
2698 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2699 | * |
7972aab2 | 2700 | * Return 0 on success else a negative value. |
55cc08a6 | 2701 | */ |
7972aab2 | 2702 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
2703 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
2704 | struct ust_app *app) | |
55cc08a6 | 2705 | { |
7972aab2 | 2706 | int ret; |
55cc08a6 | 2707 | |
7972aab2 DG |
2708 | assert(reg_sess); |
2709 | assert(reg_chan); | |
2710 | assert(ua_chan); | |
2711 | assert(ua_chan->obj); | |
55cc08a6 | 2712 | |
7972aab2 | 2713 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2714 | |
7972aab2 | 2715 | /* Setup all streams for the registry. */ |
fb45065e | 2716 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 2717 | if (ret < 0) { |
55cc08a6 DG |
2718 | goto error; |
2719 | } | |
2720 | ||
7972aab2 DG |
2721 | reg_chan->obj.ust = ua_chan->obj; |
2722 | ua_chan->obj = NULL; | |
55cc08a6 | 2723 | |
7972aab2 | 2724 | return 0; |
55cc08a6 DG |
2725 | |
2726 | error: | |
7972aab2 DG |
2727 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2728 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2729 | return ret; |
2730 | } | |
2731 | ||
edb67388 | 2732 | /* |
7972aab2 | 2733 | * Send buffer registry channel to the application. |
d0b96690 | 2734 | * |
7972aab2 | 2735 | * Return 0 on success else a negative value. |
edb67388 | 2736 | */ |
7972aab2 DG |
2737 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2738 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2739 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2740 | { |
2741 | int ret; | |
7972aab2 | 2742 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2743 | |
7972aab2 DG |
2744 | assert(reg_chan); |
2745 | assert(app); | |
2746 | assert(ua_sess); | |
2747 | assert(ua_chan); | |
2748 | ||
2749 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2750 | ||
2751 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2752 | if (ret < 0) { |
2753 | goto error; | |
2754 | } | |
2755 | ||
7972aab2 DG |
2756 | /* Send channel to the application. */ |
2757 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
2758 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2759 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2760 | goto error; | |
2761 | } else if (ret < 0) { | |
7972aab2 DG |
2762 | goto error; |
2763 | } | |
2764 | ||
2765 | health_code_update(); | |
2766 | ||
2767 | /* Send all streams to application. */ | |
2768 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2769 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2770 | struct ust_app_stream stream; | |
2771 | ||
2772 | ret = duplicate_stream_object(reg_stream, &stream); | |
2773 | if (ret < 0) { | |
2774 | goto error_stream_unlock; | |
2775 | } | |
2776 | ||
2777 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2778 | if (ret < 0) { | |
fb45065e | 2779 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
2780 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2781 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
a7169585 | 2782 | } |
7972aab2 DG |
2783 | goto error_stream_unlock; |
2784 | } | |
edb67388 | 2785 | |
7972aab2 DG |
2786 | /* |
2787 | * The return value is not important here. This function will output an | |
2788 | * error if needed. | |
2789 | */ | |
fb45065e | 2790 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
2791 | } |
2792 | ua_chan->is_sent = 1; | |
2793 | ||
2794 | error_stream_unlock: | |
2795 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2796 | error: |
2797 | return ret; | |
2798 | } | |
2799 | ||
9730260e | 2800 | /* |
7972aab2 DG |
2801 | * Create and send to the application the created buffers with per UID buffers. |
2802 | * | |
9acdc1d6 | 2803 | * This MUST be called with a RCU read side lock acquired. |
71e0a100 | 2804 | * The session list lock and the session's lock must be acquired. |
9acdc1d6 | 2805 | * |
7972aab2 | 2806 | * Return 0 on success else a negative value. |
9730260e | 2807 | */ |
7972aab2 DG |
2808 | static int create_channel_per_uid(struct ust_app *app, |
2809 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2810 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2811 | { |
2812 | int ret; | |
7972aab2 DG |
2813 | struct buffer_reg_uid *reg_uid; |
2814 | struct buffer_reg_channel *reg_chan; | |
e32d7f27 | 2815 | struct ltt_session *session = NULL; |
e098433c JG |
2816 | enum lttng_error_code notification_ret; |
2817 | struct ust_registry_channel *chan_reg; | |
9730260e | 2818 | |
7972aab2 DG |
2819 | assert(app); |
2820 | assert(usess); | |
2821 | assert(ua_sess); | |
2822 | assert(ua_chan); | |
2823 | ||
2824 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2825 | ||
2826 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2827 | /* | |
2828 | * The session creation handles the creation of this global registry | |
2829 | * object. If none can be find, there is a code flow problem or a | |
2830 | * teardown race. | |
2831 | */ | |
2832 | assert(reg_uid); | |
2833 | ||
2834 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2835 | reg_uid); | |
2721f7ea JG |
2836 | if (reg_chan) { |
2837 | goto send_channel; | |
2838 | } | |
7972aab2 | 2839 | |
2721f7ea JG |
2840 | /* Create the buffer registry channel object. */ |
2841 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2842 | if (ret < 0) { | |
2843 | ERR("Error creating the UST channel \"%s\" registry instance", | |
f14256d6 | 2844 | ua_chan->name); |
2721f7ea JG |
2845 | goto error; |
2846 | } | |
f14256d6 | 2847 | |
e098433c JG |
2848 | session = session_find_by_id(ua_sess->tracing_id); |
2849 | assert(session); | |
2850 | assert(pthread_mutex_trylock(&session->lock)); | |
2851 | assert(session_trylock_list()); | |
2852 | ||
2721f7ea JG |
2853 | /* |
2854 | * Create the buffers on the consumer side. This call populates the | |
2855 | * ust app channel object with all streams and data object. | |
2856 | */ | |
2857 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 2858 | app->bits_per_long, reg_uid->registry->reg.ust, |
d2956687 | 2859 | session->most_recent_chunk_id.value); |
2721f7ea JG |
2860 | if (ret < 0) { |
2861 | ERR("Error creating UST channel \"%s\" on the consumer daemon", | |
2862 | ua_chan->name); | |
7972aab2 DG |
2863 | |
2864 | /* | |
2721f7ea JG |
2865 | * Let's remove the previously created buffer registry channel so |
2866 | * it's not visible anymore in the session registry. | |
7972aab2 | 2867 | */ |
2721f7ea JG |
2868 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, |
2869 | ua_chan->tracing_channel_id, false); | |
2870 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2871 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2872 | goto error; | |
7972aab2 DG |
2873 | } |
2874 | ||
2721f7ea JG |
2875 | /* |
2876 | * Setup the streams and add it to the session registry. | |
2877 | */ | |
2878 | ret = setup_buffer_reg_channel(reg_uid->registry, | |
2879 | ua_chan, reg_chan, app); | |
2880 | if (ret < 0) { | |
2881 | ERR("Error setting up UST channel \"%s\"", ua_chan->name); | |
2882 | goto error; | |
2883 | } | |
2884 | ||
e098433c JG |
2885 | /* Notify the notification subsystem of the channel's creation. */ |
2886 | pthread_mutex_lock(®_uid->registry->reg.ust->lock); | |
2887 | chan_reg = ust_registry_channel_find(reg_uid->registry->reg.ust, | |
2888 | ua_chan->tracing_channel_id); | |
2889 | assert(chan_reg); | |
2890 | chan_reg->consumer_key = ua_chan->key; | |
2891 | chan_reg = NULL; | |
2892 | pthread_mutex_unlock(®_uid->registry->reg.ust->lock); | |
e9404c27 | 2893 | |
e098433c JG |
2894 | notification_ret = notification_thread_command_add_channel( |
2895 | notification_thread_handle, session->name, | |
470cc211 JG |
2896 | ua_sess->effective_credentials.uid, |
2897 | ua_sess->effective_credentials.gid, ua_chan->name, | |
2898 | ua_chan->key, LTTNG_DOMAIN_UST, | |
e098433c JG |
2899 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
2900 | if (notification_ret != LTTNG_OK) { | |
2901 | ret = - (int) notification_ret; | |
2902 | ERR("Failed to add channel to notification thread"); | |
2903 | goto error; | |
e9404c27 JG |
2904 | } |
2905 | ||
2721f7ea | 2906 | send_channel: |
66ff8e3f JG |
2907 | /* Send buffers to the application. */ |
2908 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
2909 | if (ret < 0) { | |
2910 | if (ret != -ENOTCONN) { | |
2911 | ERR("Error sending channel to application"); | |
2912 | } | |
2913 | goto error; | |
2914 | } | |
2915 | ||
9730260e | 2916 | error: |
e32d7f27 JG |
2917 | if (session) { |
2918 | session_put(session); | |
2919 | } | |
9730260e DG |
2920 | return ret; |
2921 | } | |
2922 | ||
78f0bacd | 2923 | /* |
7972aab2 DG |
2924 | * Create and send to the application the created buffers with per PID buffers. |
2925 | * | |
fad1ed2f | 2926 | * Called with UST app session lock held. |
71e0a100 | 2927 | * The session list lock and the session's lock must be acquired. |
fad1ed2f | 2928 | * |
7972aab2 | 2929 | * Return 0 on success else a negative value. |
78f0bacd | 2930 | */ |
7972aab2 DG |
2931 | static int create_channel_per_pid(struct ust_app *app, |
2932 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2933 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2934 | { |
8535a6d9 | 2935 | int ret; |
7972aab2 | 2936 | struct ust_registry_session *registry; |
e9404c27 | 2937 | enum lttng_error_code cmd_ret; |
e32d7f27 | 2938 | struct ltt_session *session = NULL; |
e9404c27 JG |
2939 | uint64_t chan_reg_key; |
2940 | struct ust_registry_channel *chan_reg; | |
78f0bacd | 2941 | |
7972aab2 DG |
2942 | assert(app); |
2943 | assert(usess); | |
2944 | assert(ua_sess); | |
2945 | assert(ua_chan); | |
2946 | ||
2947 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2948 | ||
2949 | rcu_read_lock(); | |
2950 | ||
2951 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 2952 | /* The UST app session lock is held, registry shall not be null. */ |
7972aab2 DG |
2953 | assert(registry); |
2954 | ||
2955 | /* Create and add a new channel registry to session. */ | |
2956 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2957 | if (ret < 0) { |
f14256d6 MD |
2958 | ERR("Error creating the UST channel \"%s\" registry instance", |
2959 | ua_chan->name); | |
78f0bacd DG |
2960 | goto error; |
2961 | } | |
2962 | ||
e098433c JG |
2963 | session = session_find_by_id(ua_sess->tracing_id); |
2964 | assert(session); | |
2965 | ||
2966 | assert(pthread_mutex_trylock(&session->lock)); | |
2967 | assert(session_trylock_list()); | |
2968 | ||
7972aab2 DG |
2969 | /* Create and get channel on the consumer side. */ |
2970 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 2971 | app->bits_per_long, registry, |
d2956687 | 2972 | session->most_recent_chunk_id.value); |
7972aab2 | 2973 | if (ret < 0) { |
f14256d6 MD |
2974 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2975 | ua_chan->name); | |
5b951542 | 2976 | goto error_remove_from_registry; |
7972aab2 DG |
2977 | } |
2978 | ||
2979 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2980 | if (ret < 0) { | |
a7169585 MD |
2981 | if (ret != -ENOTCONN) { |
2982 | ERR("Error sending channel to application"); | |
2983 | } | |
5b951542 | 2984 | goto error_remove_from_registry; |
7972aab2 | 2985 | } |
8535a6d9 | 2986 | |
e9404c27 JG |
2987 | chan_reg_key = ua_chan->key; |
2988 | pthread_mutex_lock(®istry->lock); | |
2989 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
2990 | assert(chan_reg); | |
2991 | chan_reg->consumer_key = ua_chan->key; | |
2992 | pthread_mutex_unlock(®istry->lock); | |
2993 | ||
2994 | cmd_ret = notification_thread_command_add_channel( | |
2995 | notification_thread_handle, session->name, | |
470cc211 JG |
2996 | ua_sess->effective_credentials.uid, |
2997 | ua_sess->effective_credentials.gid, ua_chan->name, | |
2998 | ua_chan->key, LTTNG_DOMAIN_UST, | |
e9404c27 JG |
2999 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
3000 | if (cmd_ret != LTTNG_OK) { | |
3001 | ret = - (int) cmd_ret; | |
3002 | ERR("Failed to add channel to notification thread"); | |
5b951542 | 3003 | goto error_remove_from_registry; |
e9404c27 JG |
3004 | } |
3005 | ||
5b951542 MD |
3006 | error_remove_from_registry: |
3007 | if (ret) { | |
3008 | ust_registry_channel_del_free(registry, ua_chan->key, false); | |
3009 | } | |
78f0bacd | 3010 | error: |
7972aab2 | 3011 | rcu_read_unlock(); |
e32d7f27 JG |
3012 | if (session) { |
3013 | session_put(session); | |
3014 | } | |
78f0bacd DG |
3015 | return ret; |
3016 | } | |
3017 | ||
3018 | /* | |
7972aab2 | 3019 | * From an already allocated ust app channel, create the channel buffers if |
88e3c2f5 | 3020 | * needed and send them to the application. This MUST be called with a RCU read |
7972aab2 DG |
3021 | * side lock acquired. |
3022 | * | |
fad1ed2f JR |
3023 | * Called with UST app session lock held. |
3024 | * | |
a7169585 MD |
3025 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3026 | * the application exited concurrently. | |
78f0bacd | 3027 | */ |
88e3c2f5 | 3028 | static int ust_app_channel_send(struct ust_app *app, |
7972aab2 DG |
3029 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, |
3030 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3031 | { |
7972aab2 | 3032 | int ret; |
78f0bacd | 3033 | |
7972aab2 DG |
3034 | assert(app); |
3035 | assert(usess); | |
88e3c2f5 | 3036 | assert(usess->active); |
7972aab2 DG |
3037 | assert(ua_sess); |
3038 | assert(ua_chan); | |
3039 | ||
3040 | /* Handle buffer type before sending the channel to the application. */ | |
3041 | switch (usess->buffer_type) { | |
3042 | case LTTNG_BUFFER_PER_UID: | |
3043 | { | |
3044 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
3045 | if (ret < 0) { | |
3046 | goto error; | |
3047 | } | |
3048 | break; | |
3049 | } | |
3050 | case LTTNG_BUFFER_PER_PID: | |
3051 | { | |
3052 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
3053 | if (ret < 0) { | |
3054 | goto error; | |
3055 | } | |
3056 | break; | |
3057 | } | |
3058 | default: | |
3059 | assert(0); | |
3060 | ret = -EINVAL; | |
78f0bacd DG |
3061 | goto error; |
3062 | } | |
3063 | ||
7972aab2 DG |
3064 | /* Initialize ust objd object using the received handle and add it. */ |
3065 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
3066 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 3067 | |
7972aab2 DG |
3068 | /* If channel is not enabled, disable it on the tracer */ |
3069 | if (!ua_chan->enabled) { | |
3070 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
3071 | if (ret < 0) { | |
3072 | goto error; | |
3073 | } | |
78f0bacd DG |
3074 | } |
3075 | ||
3076 | error: | |
3077 | return ret; | |
3078 | } | |
3079 | ||
284d8f55 | 3080 | /* |
88e3c2f5 | 3081 | * Create UST app channel and return it through ua_chanp if not NULL. |
d0b96690 | 3082 | * |
36b588ed | 3083 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 3084 | * |
88e3c2f5 | 3085 | * Return 0 on success or else a negative value. |
284d8f55 | 3086 | */ |
88e3c2f5 JG |
3087 | static int ust_app_channel_allocate(struct ust_app_session *ua_sess, |
3088 | struct ltt_ust_channel *uchan, | |
7972aab2 | 3089 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 3090 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
3091 | { |
3092 | int ret = 0; | |
bec39940 DG |
3093 | struct lttng_ht_iter iter; |
3094 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
3095 | struct ust_app_channel *ua_chan; |
3096 | ||
3097 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3098 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3099 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 3100 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 3101 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 3102 | goto end; |
5b4a0ec0 DG |
3103 | } |
3104 | ||
d0b96690 | 3105 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
3106 | if (ua_chan == NULL) { |
3107 | /* Only malloc can fail here */ | |
4d710ac2 | 3108 | ret = -ENOMEM; |
88e3c2f5 | 3109 | goto error; |
fc34caaa DG |
3110 | } |
3111 | shadow_copy_channel(ua_chan, uchan); | |
3112 | ||
ffe60014 DG |
3113 | /* Set channel type. */ |
3114 | ua_chan->attr.type = type; | |
3115 | ||
d0b96690 DG |
3116 | /* Only add the channel if successful on the tracer side. */ |
3117 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
fc34caaa | 3118 | end: |
4d710ac2 DG |
3119 | if (ua_chanp) { |
3120 | *ua_chanp = ua_chan; | |
3121 | } | |
3122 | ||
3123 | /* Everything went well. */ | |
3124 | return 0; | |
5b4a0ec0 DG |
3125 | |
3126 | error: | |
4d710ac2 | 3127 | return ret; |
5b4a0ec0 DG |
3128 | } |
3129 | ||
3130 | /* | |
3131 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
3132 | * |
3133 | * Called with ust app session mutex held. | |
5b4a0ec0 | 3134 | */ |
edb67388 DG |
3135 | static |
3136 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3137 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3138 | struct ust_app *app) | |
284d8f55 | 3139 | { |
edb67388 | 3140 | int ret = 0; |
5b4a0ec0 | 3141 | struct ust_app_event *ua_event; |
284d8f55 | 3142 | |
edb67388 DG |
3143 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
3144 | if (ua_event == NULL) { | |
20533947 | 3145 | /* Only failure mode of alloc_ust_app_event(). */ |
edb67388 | 3146 | ret = -ENOMEM; |
fc34caaa | 3147 | goto end; |
5b4a0ec0 | 3148 | } |
edb67388 | 3149 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3150 | |
edb67388 | 3151 | /* Create it on the tracer side */ |
5b4a0ec0 | 3152 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3153 | if (ret < 0) { |
e9f11505 JG |
3154 | /* |
3155 | * Not found previously means that it does not exist on the | |
3156 | * tracer. If the application reports that the event existed, | |
3157 | * it means there is a bug in the sessiond or lttng-ust | |
3158 | * (or corruption, etc.) | |
3159 | */ | |
3160 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3161 | ERR("Tracer for application reported that an event being created already existed: " | |
3162 | "event_name = \"%s\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
3163 | uevent->attr.name, | |
3164 | app->pid, app->ppid, app->uid, | |
3165 | app->gid); | |
3166 | } | |
284d8f55 DG |
3167 | goto error; |
3168 | } | |
3169 | ||
d0b96690 | 3170 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3171 | |
fc34caaa | 3172 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 3173 | app->pid); |
7f79d3a1 | 3174 | |
edb67388 | 3175 | end: |
fc34caaa DG |
3176 | return ret; |
3177 | ||
5b4a0ec0 | 3178 | error: |
fc34caaa | 3179 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3180 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3181 | return ret; |
5b4a0ec0 DG |
3182 | } |
3183 | ||
3184 | /* | |
3185 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3186 | * |
7972aab2 | 3187 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3188 | */ |
3189 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3190 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3191 | { |
3192 | int ret = 0; | |
ffe60014 | 3193 | struct ust_app_channel *metadata; |
d88aee68 | 3194 | struct consumer_socket *socket; |
7972aab2 | 3195 | struct ust_registry_session *registry; |
e32d7f27 | 3196 | struct ltt_session *session = NULL; |
5b4a0ec0 | 3197 | |
ffe60014 DG |
3198 | assert(ua_sess); |
3199 | assert(app); | |
d88aee68 | 3200 | assert(consumer); |
5b4a0ec0 | 3201 | |
7972aab2 | 3202 | registry = get_session_registry(ua_sess); |
fad1ed2f | 3203 | /* The UST app session is held registry shall not be null. */ |
7972aab2 DG |
3204 | assert(registry); |
3205 | ||
ce34fcd0 MD |
3206 | pthread_mutex_lock(®istry->lock); |
3207 | ||
1b532a60 DG |
3208 | /* Metadata already exists for this registry or it was closed previously */ |
3209 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3210 | ret = 0; |
3211 | goto error; | |
5b4a0ec0 DG |
3212 | } |
3213 | ||
ffe60014 | 3214 | /* Allocate UST metadata */ |
d0b96690 | 3215 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3216 | if (!metadata) { |
3217 | /* malloc() failed */ | |
3218 | ret = -ENOMEM; | |
3219 | goto error; | |
3220 | } | |
5b4a0ec0 | 3221 | |
ad7a9107 | 3222 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3223 | |
7972aab2 DG |
3224 | /* Need one fd for the channel. */ |
3225 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3226 | if (ret < 0) { | |
3227 | ERR("Exhausted number of available FD upon create metadata"); | |
3228 | goto error; | |
3229 | } | |
3230 | ||
4dc3dfc5 DG |
3231 | /* Get the right consumer socket for the application. */ |
3232 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3233 | if (!socket) { | |
3234 | ret = -EINVAL; | |
3235 | goto error_consumer; | |
3236 | } | |
3237 | ||
331744e3 JD |
3238 | /* |
3239 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3240 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3241 | * consumer requesting the metadata and the ask_channel call on our side | |
3242 | * did not returned yet. | |
3243 | */ | |
3244 | registry->metadata_key = metadata->key; | |
3245 | ||
e098433c JG |
3246 | session = session_find_by_id(ua_sess->tracing_id); |
3247 | assert(session); | |
3248 | ||
3249 | assert(pthread_mutex_trylock(&session->lock)); | |
3250 | assert(session_trylock_list()); | |
3251 | ||
d88aee68 DG |
3252 | /* |
3253 | * Ask the metadata channel creation to the consumer. The metadata object | |
3254 | * will be created by the consumer and kept their. However, the stream is | |
3255 | * never added or monitored until we do a first push metadata to the | |
3256 | * consumer. | |
3257 | */ | |
7972aab2 | 3258 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
d2956687 | 3259 | registry, session->current_trace_chunk); |
d88aee68 | 3260 | if (ret < 0) { |
f2a444f1 DG |
3261 | /* Nullify the metadata key so we don't try to close it later on. */ |
3262 | registry->metadata_key = 0; | |
d88aee68 DG |
3263 | goto error_consumer; |
3264 | } | |
3265 | ||
3266 | /* | |
3267 | * The setup command will make the metadata stream be sent to the relayd, | |
3268 | * if applicable, and the thread managing the metadatas. This is important | |
3269 | * because after this point, if an error occurs, the only way the stream | |
3270 | * can be deleted is to be monitored in the consumer. | |
3271 | */ | |
7972aab2 | 3272 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3273 | if (ret < 0) { |
f2a444f1 DG |
3274 | /* Nullify the metadata key so we don't try to close it later on. */ |
3275 | registry->metadata_key = 0; | |
d88aee68 | 3276 | goto error_consumer; |
5b4a0ec0 DG |
3277 | } |
3278 | ||
7972aab2 DG |
3279 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3280 | metadata->key, app->pid); | |
5b4a0ec0 | 3281 | |
d88aee68 | 3282 | error_consumer: |
b80f0b6c | 3283 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3284 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3285 | error: |
ce34fcd0 | 3286 | pthread_mutex_unlock(®istry->lock); |
e32d7f27 JG |
3287 | if (session) { |
3288 | session_put(session); | |
3289 | } | |
ffe60014 | 3290 | return ret; |
5b4a0ec0 DG |
3291 | } |
3292 | ||
5b4a0ec0 | 3293 | /* |
d88aee68 DG |
3294 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3295 | * acquired before calling this function. | |
5b4a0ec0 DG |
3296 | */ |
3297 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3298 | { | |
d88aee68 | 3299 | struct ust_app *app = NULL; |
bec39940 DG |
3300 | struct lttng_ht_node_ulong *node; |
3301 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3302 | |
bec39940 DG |
3303 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3304 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3305 | if (node == NULL) { |
3306 | DBG2("UST app no found with pid %d", pid); | |
3307 | goto error; | |
3308 | } | |
5b4a0ec0 DG |
3309 | |
3310 | DBG2("Found UST app by pid %d", pid); | |
3311 | ||
d88aee68 | 3312 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3313 | |
3314 | error: | |
d88aee68 | 3315 | return app; |
5b4a0ec0 DG |
3316 | } |
3317 | ||
d88aee68 DG |
3318 | /* |
3319 | * Allocate and init an UST app object using the registration information and | |
3320 | * the command socket. This is called when the command socket connects to the | |
3321 | * session daemon. | |
3322 | * | |
3323 | * The object is returned on success or else NULL. | |
3324 | */ | |
d0b96690 | 3325 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3326 | { |
d0b96690 DG |
3327 | struct ust_app *lta = NULL; |
3328 | ||
3329 | assert(msg); | |
3330 | assert(sock >= 0); | |
3331 | ||
3332 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3333 | |
173af62f DG |
3334 | if ((msg->bits_per_long == 64 && |
3335 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3336 | || (msg->bits_per_long == 32 && | |
3337 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3338 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3339 | "%d-bit long, but no consumerd for this size is available.\n", |
3340 | msg->name, msg->pid, msg->bits_per_long); | |
3341 | goto error; | |
3f2c5fcc | 3342 | } |
d0b96690 | 3343 | |
5b4a0ec0 DG |
3344 | lta = zmalloc(sizeof(struct ust_app)); |
3345 | if (lta == NULL) { | |
3346 | PERROR("malloc"); | |
d0b96690 | 3347 | goto error; |
5b4a0ec0 DG |
3348 | } |
3349 | ||
3350 | lta->ppid = msg->ppid; | |
3351 | lta->uid = msg->uid; | |
3352 | lta->gid = msg->gid; | |
d0b96690 | 3353 | |
7753dea8 | 3354 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3355 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3356 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3357 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3358 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3359 | lta->long_alignment = msg->long_alignment; | |
3360 | lta->byte_order = msg->byte_order; | |
3361 | ||
5b4a0ec0 DG |
3362 | lta->v_major = msg->major; |
3363 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3364 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3365 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3366 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3367 | lta->notify_sock = -1; |
d88aee68 DG |
3368 | |
3369 | /* Copy name and make sure it's NULL terminated. */ | |
3370 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3371 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3372 | ||
3373 | /* | |
3374 | * Before this can be called, when receiving the registration information, | |
3375 | * the application compatibility is checked. So, at this point, the | |
3376 | * application can work with this session daemon. | |
3377 | */ | |
d0b96690 | 3378 | lta->compatible = 1; |
5b4a0ec0 | 3379 | |
852d0037 | 3380 | lta->pid = msg->pid; |
d0b96690 | 3381 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3382 | lta->sock = sock; |
fb45065e | 3383 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3384 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3385 | |
d42f20df | 3386 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 DG |
3387 | error: |
3388 | return lta; | |
3389 | } | |
3390 | ||
d88aee68 DG |
3391 | /* |
3392 | * For a given application object, add it to every hash table. | |
3393 | */ | |
d0b96690 DG |
3394 | void ust_app_add(struct ust_app *app) |
3395 | { | |
3396 | assert(app); | |
3397 | assert(app->notify_sock >= 0); | |
3398 | ||
940c4592 JR |
3399 | app->registration_time = time(NULL); |
3400 | ||
5b4a0ec0 | 3401 | rcu_read_lock(); |
852d0037 DG |
3402 | |
3403 | /* | |
3404 | * On a re-registration, we want to kick out the previous registration of | |
3405 | * that pid | |
3406 | */ | |
d0b96690 | 3407 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3408 | |
3409 | /* | |
3410 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3411 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3412 | * already in the table. | |
3413 | */ | |
d0b96690 | 3414 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3415 | |
d0b96690 DG |
3416 | /* Add application to the notify socket hash table. */ |
3417 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3418 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3419 | |
d0b96690 | 3420 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3421 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3422 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3423 | app->v_minor); | |
5b4a0ec0 | 3424 | |
d0b96690 DG |
3425 | rcu_read_unlock(); |
3426 | } | |
3427 | ||
d88aee68 DG |
3428 | /* |
3429 | * Set the application version into the object. | |
3430 | * | |
3431 | * Return 0 on success else a negative value either an errno code or a | |
3432 | * LTTng-UST error code. | |
3433 | */ | |
d0b96690 DG |
3434 | int ust_app_version(struct ust_app *app) |
3435 | { | |
d88aee68 DG |
3436 | int ret; |
3437 | ||
d0b96690 | 3438 | assert(app); |
d88aee68 | 3439 | |
fb45065e | 3440 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3441 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3442 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3443 | if (ret < 0) { |
3444 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3445 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3446 | } else { |
5368d366 | 3447 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3448 | } |
3449 | } | |
3450 | ||
3451 | return ret; | |
5b4a0ec0 DG |
3452 | } |
3453 | ||
3454 | /* | |
3455 | * Unregister app by removing it from the global traceable app list and freeing | |
3456 | * the data struct. | |
3457 | * | |
3458 | * The socket is already closed at this point so no close to sock. | |
3459 | */ | |
3460 | void ust_app_unregister(int sock) | |
3461 | { | |
3462 | struct ust_app *lta; | |
bec39940 | 3463 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3464 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3465 | struct lttng_ht_iter iter; |
d42f20df | 3466 | struct ust_app_session *ua_sess; |
525b0740 | 3467 | int ret; |
5b4a0ec0 DG |
3468 | |
3469 | rcu_read_lock(); | |
886459c6 | 3470 | |
5b4a0ec0 | 3471 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3472 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3473 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3474 | assert(node); |
284d8f55 | 3475 | |
852d0037 | 3476 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3477 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3478 | ||
d88aee68 | 3479 | /* |
ce34fcd0 MD |
3480 | * For per-PID buffers, perform "push metadata" and flush all |
3481 | * application streams before removing app from hash tables, | |
3482 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3483 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3484 | */ |
d42f20df DG |
3485 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3486 | node.node) { | |
7972aab2 DG |
3487 | struct ust_registry_session *registry; |
3488 | ||
d42f20df DG |
3489 | ret = lttng_ht_del(lta->sessions, &iter); |
3490 | if (ret) { | |
3491 | /* The session was already removed so scheduled for teardown. */ | |
3492 | continue; | |
3493 | } | |
3494 | ||
ce34fcd0 MD |
3495 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3496 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3497 | } | |
c4b88406 | 3498 | |
d42f20df DG |
3499 | /* |
3500 | * Add session to list for teardown. This is safe since at this point we | |
3501 | * are the only one using this list. | |
3502 | */ | |
d88aee68 DG |
3503 | pthread_mutex_lock(&ua_sess->lock); |
3504 | ||
b161602a MD |
3505 | if (ua_sess->deleted) { |
3506 | pthread_mutex_unlock(&ua_sess->lock); | |
3507 | continue; | |
3508 | } | |
3509 | ||
d88aee68 DG |
3510 | /* |
3511 | * Normally, this is done in the delete session process which is | |
3512 | * executed in the call rcu below. However, upon registration we can't | |
3513 | * afford to wait for the grace period before pushing data or else the | |
3514 | * data pending feature can race between the unregistration and stop | |
3515 | * command where the data pending command is sent *before* the grace | |
3516 | * period ended. | |
3517 | * | |
3518 | * The close metadata below nullifies the metadata pointer in the | |
3519 | * session so the delete session will NOT push/close a second time. | |
3520 | */ | |
7972aab2 | 3521 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3522 | if (registry) { |
7972aab2 DG |
3523 | /* Push metadata for application before freeing the application. */ |
3524 | (void) push_metadata(registry, ua_sess->consumer); | |
3525 | ||
3526 | /* | |
3527 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3528 | * metadata only on destroy trace session in this case. Also, the |
3529 | * previous push metadata could have flag the metadata registry to | |
3530 | * close so don't send a close command if closed. | |
7972aab2 | 3531 | */ |
ce34fcd0 | 3532 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3533 | /* And ask to close it for this session registry. */ |
3534 | (void) close_metadata(registry, ua_sess->consumer); | |
3535 | } | |
3536 | } | |
d42f20df | 3537 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3538 | |
d88aee68 | 3539 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3540 | } |
3541 | ||
c4b88406 MD |
3542 | /* Remove application from PID hash table */ |
3543 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3544 | assert(!ret); | |
3545 | ||
3546 | /* | |
3547 | * Remove application from notify hash table. The thread handling the | |
3548 | * notify socket could have deleted the node so ignore on error because | |
c48239ca JG |
3549 | * either way it's valid. The close of that socket is handled by the |
3550 | * apps_notify_thread. | |
c4b88406 MD |
3551 | */ |
3552 | iter.iter.node = <a->notify_sock_n.node; | |
3553 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3554 | ||
3555 | /* | |
3556 | * Ignore return value since the node might have been removed before by an | |
3557 | * add replace during app registration because the PID can be reassigned by | |
3558 | * the OS. | |
3559 | */ | |
3560 | iter.iter.node = <a->pid_n.node; | |
3561 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3562 | if (ret) { | |
3563 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3564 | lta->pid); | |
3565 | } | |
3566 | ||
852d0037 DG |
3567 | /* Free memory */ |
3568 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3569 | ||
5b4a0ec0 DG |
3570 | rcu_read_unlock(); |
3571 | return; | |
284d8f55 DG |
3572 | } |
3573 | ||
5b4a0ec0 DG |
3574 | /* |
3575 | * Fill events array with all events name of all registered apps. | |
3576 | */ | |
3577 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3578 | { |
5b4a0ec0 DG |
3579 | int ret, handle; |
3580 | size_t nbmem, count = 0; | |
bec39940 | 3581 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3582 | struct ust_app *app; |
c617c0c6 | 3583 | struct lttng_event *tmp_event; |
421cb601 | 3584 | |
5b4a0ec0 | 3585 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3586 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3587 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3588 | PERROR("zmalloc ust app events"); |
3589 | ret = -ENOMEM; | |
421cb601 DG |
3590 | goto error; |
3591 | } | |
3592 | ||
5b4a0ec0 | 3593 | rcu_read_lock(); |
421cb601 | 3594 | |
852d0037 | 3595 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3596 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3597 | |
840cb59c | 3598 | health_code_update(); |
86acf0da | 3599 | |
e0c7ec2b DG |
3600 | if (!app->compatible) { |
3601 | /* | |
3602 | * TODO: In time, we should notice the caller of this error by | |
3603 | * telling him that this is a version error. | |
3604 | */ | |
3605 | continue; | |
3606 | } | |
fb45065e | 3607 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 3608 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3609 | if (handle < 0) { |
ffe60014 DG |
3610 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3611 | ERR("UST app list events getting handle failed for app pid %d", | |
3612 | app->pid); | |
3613 | } | |
fb45065e | 3614 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
3615 | continue; |
3616 | } | |
421cb601 | 3617 | |
852d0037 | 3618 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3619 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3620 | /* Handle ustctl error. */ |
3621 | if (ret < 0) { | |
fb45065e MD |
3622 | int release_ret; |
3623 | ||
a2ba1ab0 | 3624 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3625 | ERR("UST app tp list get failed for app %d with ret %d", |
3626 | app->sock, ret); | |
3627 | } else { | |
3628 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3629 | /* |
3630 | * This is normal behavior, an application can die during the | |
3631 | * creation process. Don't report an error so the execution can | |
3632 | * continue normally. Continue normal execution. | |
3633 | */ | |
3634 | break; | |
ffe60014 | 3635 | } |
98f595d4 | 3636 | free(tmp_event); |
fb45065e | 3637 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3638 | if (release_ret < 0 && |
3639 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3640 | release_ret != -EPIPE) { | |
fb45065e MD |
3641 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3642 | } | |
3643 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
3644 | goto rcu_error; |
3645 | } | |
3646 | ||
840cb59c | 3647 | health_code_update(); |
815564d8 | 3648 | if (count >= nbmem) { |
d7b3776f | 3649 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3650 | struct lttng_event *new_tmp_event; |
3651 | size_t new_nbmem; | |
3652 | ||
3653 | new_nbmem = nbmem << 1; | |
3654 | DBG2("Reallocating event list from %zu to %zu entries", | |
3655 | nbmem, new_nbmem); | |
3656 | new_tmp_event = realloc(tmp_event, | |
3657 | new_nbmem * sizeof(struct lttng_event)); | |
3658 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3659 | int release_ret; |
3660 | ||
5b4a0ec0 | 3661 | PERROR("realloc ust app events"); |
c617c0c6 | 3662 | free(tmp_event); |
5b4a0ec0 | 3663 | ret = -ENOMEM; |
fb45065e | 3664 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3665 | if (release_ret < 0 && |
3666 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3667 | release_ret != -EPIPE) { | |
fb45065e MD |
3668 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3669 | } | |
3670 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
3671 | goto rcu_error; |
3672 | } | |
53efb85a MD |
3673 | /* Zero the new memory */ |
3674 | memset(new_tmp_event + nbmem, 0, | |
3675 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3676 | nbmem = new_nbmem; | |
3677 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3678 | } |
c617c0c6 MD |
3679 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3680 | tmp_event[count].loglevel = uiter.loglevel; | |
3681 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3682 | tmp_event[count].pid = app->pid; | |
3683 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3684 | count++; |
421cb601 | 3685 | } |
fb45065e MD |
3686 | ret = ustctl_release_handle(app->sock, handle); |
3687 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 3688 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
3689 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3690 | } | |
421cb601 DG |
3691 | } |
3692 | ||
5b4a0ec0 | 3693 | ret = count; |
c617c0c6 | 3694 | *events = tmp_event; |
421cb601 | 3695 | |
5b4a0ec0 | 3696 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3697 | |
5b4a0ec0 DG |
3698 | rcu_error: |
3699 | rcu_read_unlock(); | |
421cb601 | 3700 | error: |
840cb59c | 3701 | health_code_update(); |
5b4a0ec0 | 3702 | return ret; |
421cb601 DG |
3703 | } |
3704 | ||
f37d259d MD |
3705 | /* |
3706 | * Fill events array with all events name of all registered apps. | |
3707 | */ | |
3708 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3709 | { | |
3710 | int ret, handle; | |
3711 | size_t nbmem, count = 0; | |
3712 | struct lttng_ht_iter iter; | |
3713 | struct ust_app *app; | |
c617c0c6 | 3714 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3715 | |
3716 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3717 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3718 | if (tmp_event == NULL) { | |
f37d259d MD |
3719 | PERROR("zmalloc ust app event fields"); |
3720 | ret = -ENOMEM; | |
3721 | goto error; | |
3722 | } | |
3723 | ||
3724 | rcu_read_lock(); | |
3725 | ||
3726 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3727 | struct lttng_ust_field_iter uiter; | |
3728 | ||
840cb59c | 3729 | health_code_update(); |
86acf0da | 3730 | |
f37d259d MD |
3731 | if (!app->compatible) { |
3732 | /* | |
3733 | * TODO: In time, we should notice the caller of this error by | |
3734 | * telling him that this is a version error. | |
3735 | */ | |
3736 | continue; | |
3737 | } | |
fb45065e | 3738 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
3739 | handle = ustctl_tracepoint_field_list(app->sock); |
3740 | if (handle < 0) { | |
ffe60014 DG |
3741 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3742 | ERR("UST app list field getting handle failed for app pid %d", | |
3743 | app->pid); | |
3744 | } | |
fb45065e | 3745 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
3746 | continue; |
3747 | } | |
3748 | ||
3749 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3750 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3751 | /* Handle ustctl error. */ |
3752 | if (ret < 0) { | |
fb45065e MD |
3753 | int release_ret; |
3754 | ||
a2ba1ab0 | 3755 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3756 | ERR("UST app tp list field failed for app %d with ret %d", |
3757 | app->sock, ret); | |
3758 | } else { | |
3759 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3760 | /* |
3761 | * This is normal behavior, an application can die during the | |
3762 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3763 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3764 | */ |
3765 | break; | |
ffe60014 | 3766 | } |
98f595d4 | 3767 | free(tmp_event); |
fb45065e MD |
3768 | release_ret = ustctl_release_handle(app->sock, handle); |
3769 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3770 | if (release_ret < 0 && |
3771 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3772 | release_ret != -EPIPE) { | |
fb45065e MD |
3773 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3774 | } | |
ffe60014 DG |
3775 | goto rcu_error; |
3776 | } | |
3777 | ||
840cb59c | 3778 | health_code_update(); |
f37d259d | 3779 | if (count >= nbmem) { |
d7b3776f | 3780 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3781 | struct lttng_event_field *new_tmp_event; |
3782 | size_t new_nbmem; | |
3783 | ||
3784 | new_nbmem = nbmem << 1; | |
3785 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3786 | nbmem, new_nbmem); | |
3787 | new_tmp_event = realloc(tmp_event, | |
3788 | new_nbmem * sizeof(struct lttng_event_field)); | |
3789 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3790 | int release_ret; |
3791 | ||
f37d259d | 3792 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3793 | free(tmp_event); |
f37d259d | 3794 | ret = -ENOMEM; |
fb45065e MD |
3795 | release_ret = ustctl_release_handle(app->sock, handle); |
3796 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3797 | if (release_ret && |
3798 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3799 | release_ret != -EPIPE) { | |
fb45065e MD |
3800 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3801 | } | |
f37d259d MD |
3802 | goto rcu_error; |
3803 | } | |
53efb85a MD |
3804 | /* Zero the new memory */ |
3805 | memset(new_tmp_event + nbmem, 0, | |
3806 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3807 | nbmem = new_nbmem; | |
3808 | tmp_event = new_tmp_event; | |
f37d259d | 3809 | } |
f37d259d | 3810 | |
c617c0c6 | 3811 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3812 | /* Mapping between these enums matches 1 to 1. */ |
3813 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3814 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3815 | |
c617c0c6 MD |
3816 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3817 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3818 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3819 | tmp_event[count].event.pid = app->pid; |
3820 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3821 | count++; |
3822 | } | |
fb45065e MD |
3823 | ret = ustctl_release_handle(app->sock, handle); |
3824 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3825 | if (ret < 0 && |
3826 | ret != -LTTNG_UST_ERR_EXITING && | |
3827 | ret != -EPIPE) { | |
fb45065e MD |
3828 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3829 | } | |
f37d259d MD |
3830 | } |
3831 | ||
3832 | ret = count; | |
c617c0c6 | 3833 | *fields = tmp_event; |
f37d259d MD |
3834 | |
3835 | DBG2("UST app list event fields done (%zu events)", count); | |
3836 | ||
3837 | rcu_error: | |
3838 | rcu_read_unlock(); | |
3839 | error: | |
840cb59c | 3840 | health_code_update(); |
f37d259d MD |
3841 | return ret; |
3842 | } | |
3843 | ||
5b4a0ec0 DG |
3844 | /* |
3845 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3846 | * |
3847 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3848 | */ |
3849 | void ust_app_clean_list(void) | |
421cb601 | 3850 | { |
5b4a0ec0 | 3851 | int ret; |
659ed79f | 3852 | struct ust_app *app; |
bec39940 | 3853 | struct lttng_ht_iter iter; |
421cb601 | 3854 | |
5b4a0ec0 | 3855 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3856 | |
5b4a0ec0 | 3857 | rcu_read_lock(); |
421cb601 | 3858 | |
faadaa3a JG |
3859 | /* Cleanup notify socket hash table */ |
3860 | if (ust_app_ht_by_notify_sock) { | |
3861 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3862 | notify_sock_n.node) { | |
3863 | struct cds_lfht_node *node; | |
3864 | struct ust_app *app; | |
3865 | ||
3866 | node = cds_lfht_iter_get_node(&iter.iter); | |
3867 | if (!node) { | |
3868 | continue; | |
3869 | } | |
3870 | ||
3871 | app = container_of(node, struct ust_app, | |
3872 | notify_sock_n.node); | |
3873 | ust_app_notify_sock_unregister(app->notify_sock); | |
3874 | } | |
3875 | } | |
3876 | ||
f1b711c4 MD |
3877 | if (ust_app_ht) { |
3878 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3879 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3880 | assert(!ret); | |
3881 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3882 | } | |
421cb601 DG |
3883 | } |
3884 | ||
852d0037 | 3885 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3886 | if (ust_app_ht_by_sock) { |
3887 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3888 | sock_n.node) { | |
3889 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3890 | assert(!ret); | |
3891 | } | |
bec39940 | 3892 | } |
852d0037 | 3893 | |
36b588ed | 3894 | rcu_read_unlock(); |
d88aee68 | 3895 | |
bec39940 | 3896 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3897 | if (ust_app_ht) { |
3898 | ht_cleanup_push(ust_app_ht); | |
3899 | } | |
3900 | if (ust_app_ht_by_sock) { | |
3901 | ht_cleanup_push(ust_app_ht_by_sock); | |
3902 | } | |
3903 | if (ust_app_ht_by_notify_sock) { | |
3904 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3905 | } | |
5b4a0ec0 DG |
3906 | } |
3907 | ||
3908 | /* | |
3909 | * Init UST app hash table. | |
3910 | */ | |
57703f6e | 3911 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3912 | { |
bec39940 | 3913 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3914 | if (!ust_app_ht) { |
3915 | return -1; | |
3916 | } | |
852d0037 | 3917 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3918 | if (!ust_app_ht_by_sock) { |
3919 | return -1; | |
3920 | } | |
d0b96690 | 3921 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3922 | if (!ust_app_ht_by_notify_sock) { |
3923 | return -1; | |
3924 | } | |
3925 | return 0; | |
421cb601 DG |
3926 | } |
3927 | ||
78f0bacd DG |
3928 | /* |
3929 | * For a specific UST session, disable the channel for all registered apps. | |
3930 | */ | |
35a9059d | 3931 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3932 | struct ltt_ust_channel *uchan) |
3933 | { | |
3934 | int ret = 0; | |
bec39940 DG |
3935 | struct lttng_ht_iter iter; |
3936 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3937 | struct ust_app *app; |
3938 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3939 | struct ust_app_channel *ua_chan; |
78f0bacd | 3940 | |
88e3c2f5 | 3941 | assert(usess->active); |
d9bf3ca4 | 3942 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3943 | uchan->name, usess->id); |
78f0bacd DG |
3944 | |
3945 | rcu_read_lock(); | |
3946 | ||
3947 | /* For every registered applications */ | |
852d0037 | 3948 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3949 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3950 | if (!app->compatible) { |
3951 | /* | |
3952 | * TODO: In time, we should notice the caller of this error by | |
3953 | * telling him that this is a version error. | |
3954 | */ | |
3955 | continue; | |
3956 | } | |
78f0bacd DG |
3957 | ua_sess = lookup_session_by_app(usess, app); |
3958 | if (ua_sess == NULL) { | |
3959 | continue; | |
3960 | } | |
3961 | ||
8535a6d9 | 3962 | /* Get channel */ |
bec39940 DG |
3963 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3964 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3965 | /* If the session if found for the app, the channel must be there */ |
3966 | assert(ua_chan_node); | |
3967 | ||
3968 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3969 | /* The channel must not be already disabled */ | |
3970 | assert(ua_chan->enabled == 1); | |
3971 | ||
3972 | /* Disable channel onto application */ | |
3973 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3974 | if (ret < 0) { |
3975 | /* XXX: We might want to report this error at some point... */ | |
3976 | continue; | |
3977 | } | |
3978 | } | |
3979 | ||
3980 | rcu_read_unlock(); | |
78f0bacd DG |
3981 | return ret; |
3982 | } | |
3983 | ||
3984 | /* | |
3985 | * For a specific UST session, enable the channel for all registered apps. | |
3986 | */ | |
35a9059d | 3987 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3988 | struct ltt_ust_channel *uchan) |
3989 | { | |
3990 | int ret = 0; | |
bec39940 | 3991 | struct lttng_ht_iter iter; |
78f0bacd DG |
3992 | struct ust_app *app; |
3993 | struct ust_app_session *ua_sess; | |
3994 | ||
88e3c2f5 | 3995 | assert(usess->active); |
d9bf3ca4 | 3996 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3997 | uchan->name, usess->id); |
78f0bacd DG |
3998 | |
3999 | rcu_read_lock(); | |
4000 | ||
4001 | /* For every registered applications */ | |
852d0037 | 4002 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4003 | if (!app->compatible) { |
4004 | /* | |
4005 | * TODO: In time, we should notice the caller of this error by | |
4006 | * telling him that this is a version error. | |
4007 | */ | |
4008 | continue; | |
4009 | } | |
78f0bacd DG |
4010 | ua_sess = lookup_session_by_app(usess, app); |
4011 | if (ua_sess == NULL) { | |
4012 | continue; | |
4013 | } | |
4014 | ||
4015 | /* Enable channel onto application */ | |
4016 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
4017 | if (ret < 0) { | |
4018 | /* XXX: We might want to report this error at some point... */ | |
4019 | continue; | |
4020 | } | |
4021 | } | |
4022 | ||
4023 | rcu_read_unlock(); | |
78f0bacd DG |
4024 | return ret; |
4025 | } | |
4026 | ||
b0a40d28 DG |
4027 | /* |
4028 | * Disable an event in a channel and for a specific session. | |
4029 | */ | |
35a9059d DG |
4030 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
4031 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
4032 | { |
4033 | int ret = 0; | |
bec39940 | 4034 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 4035 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
4036 | struct ust_app *app; |
4037 | struct ust_app_session *ua_sess; | |
4038 | struct ust_app_channel *ua_chan; | |
4039 | struct ust_app_event *ua_event; | |
4040 | ||
88e3c2f5 | 4041 | assert(usess->active); |
b0a40d28 | 4042 | DBG("UST app disabling event %s for all apps in channel " |
d9bf3ca4 MD |
4043 | "%s for session id %" PRIu64, |
4044 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
4045 | |
4046 | rcu_read_lock(); | |
4047 | ||
4048 | /* For all registered applications */ | |
852d0037 | 4049 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4050 | if (!app->compatible) { |
4051 | /* | |
4052 | * TODO: In time, we should notice the caller of this error by | |
4053 | * telling him that this is a version error. | |
4054 | */ | |
4055 | continue; | |
4056 | } | |
b0a40d28 DG |
4057 | ua_sess = lookup_session_by_app(usess, app); |
4058 | if (ua_sess == NULL) { | |
4059 | /* Next app */ | |
4060 | continue; | |
4061 | } | |
4062 | ||
4063 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4064 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4065 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4066 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4067 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4068 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4069 | continue; |
4070 | } | |
4071 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4072 | ||
700c5a9d JR |
4073 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4074 | uevent->filter, uevent->attr.loglevel, | |
4075 | uevent->exclusion); | |
4076 | if (ua_event == NULL) { | |
b0a40d28 | 4077 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4078 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4079 | continue; |
4080 | } | |
b0a40d28 | 4081 | |
7f79d3a1 | 4082 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4083 | if (ret < 0) { |
4084 | /* XXX: Report error someday... */ | |
4085 | continue; | |
4086 | } | |
4087 | } | |
4088 | ||
4089 | rcu_read_unlock(); | |
88e3c2f5 JG |
4090 | return ret; |
4091 | } | |
4092 | ||
4093 | /* The ua_sess lock must be held by the caller. */ | |
4094 | static | |
4095 | int ust_app_channel_create(struct ltt_ust_session *usess, | |
4096 | struct ust_app_session *ua_sess, | |
4097 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
4098 | struct ust_app_channel **_ua_chan) | |
4099 | { | |
4100 | int ret = 0; | |
4101 | struct ust_app_channel *ua_chan = NULL; | |
4102 | ||
4103 | assert(ua_sess); | |
4104 | ASSERT_LOCKED(ua_sess->lock); | |
4105 | ||
4106 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, | |
4107 | sizeof(uchan->name))) { | |
4108 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, | |
4109 | &uchan->attr); | |
4110 | ret = 0; | |
4111 | } else { | |
4112 | struct ltt_ust_context *uctx = NULL; | |
4113 | ||
4114 | /* | |
4115 | * Create channel onto application and synchronize its | |
4116 | * configuration. | |
4117 | */ | |
4118 | ret = ust_app_channel_allocate(ua_sess, uchan, | |
4119 | LTTNG_UST_CHAN_PER_CPU, usess, | |
4120 | &ua_chan); | |
4121 | if (ret == 0) { | |
4122 | ret = ust_app_channel_send(app, usess, | |
4123 | ua_sess, ua_chan); | |
4124 | } else { | |
4125 | goto end; | |
4126 | } | |
4127 | ||
4128 | /* Add contexts. */ | |
4129 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { | |
4130 | ret = create_ust_app_channel_context(ua_chan, | |
4131 | &uctx->ctx, app); | |
4132 | if (ret) { | |
4133 | goto end; | |
4134 | } | |
4135 | } | |
4136 | } | |
4137 | if (ret < 0) { | |
4138 | switch (ret) { | |
4139 | case -ENOTCONN: | |
4140 | /* | |
4141 | * The application's socket is not valid. Either a bad socket | |
4142 | * or a timeout on it. We can't inform the caller that for a | |
4143 | * specific app, the session failed so lets continue here. | |
4144 | */ | |
4145 | ret = 0; /* Not an error. */ | |
4146 | break; | |
4147 | case -ENOMEM: | |
4148 | default: | |
4149 | break; | |
4150 | } | |
4151 | } | |
0498a00c | 4152 | end: |
88e3c2f5 JG |
4153 | if (ret == 0 && _ua_chan) { |
4154 | /* | |
4155 | * Only return the application's channel on success. Note | |
4156 | * that the channel can still be part of the application's | |
4157 | * channel hashtable on error. | |
4158 | */ | |
4159 | *_ua_chan = ua_chan; | |
4160 | } | |
b0a40d28 DG |
4161 | return ret; |
4162 | } | |
4163 | ||
421cb601 | 4164 | /* |
5b4a0ec0 | 4165 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 4166 | */ |
35a9059d | 4167 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4168 | struct ltt_ust_channel *uchan) |
4169 | { | |
88e3c2f5 JG |
4170 | int ret = 0; |
4171 | struct cds_lfht_iter iter; | |
48842b30 | 4172 | struct ust_app *app; |
48842b30 | 4173 | |
fc34caaa | 4174 | assert(usess); |
88e3c2f5 | 4175 | assert(usess->active); |
fc34caaa | 4176 | assert(uchan); |
421cb601 | 4177 | |
d9bf3ca4 | 4178 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 4179 | uchan->name, usess->id); |
48842b30 DG |
4180 | |
4181 | rcu_read_lock(); | |
5b4a0ec0 | 4182 | /* For every registered applications */ |
88e3c2f5 JG |
4183 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter, app, pid_n.node) { |
4184 | struct ust_app_session *ua_sess; | |
4185 | int session_was_created = 0; | |
4186 | ||
4187 | if (!app->compatible || | |
4188 | !trace_ust_pid_tracker_lookup(usess, app->pid)) { | |
4189 | goto error_rcu_unlock; | |
a9ad0c8f MD |
4190 | } |
4191 | ||
edb67388 DG |
4192 | /* |
4193 | * Create session on the tracer side and add it to app session HT. Note | |
4194 | * that if session exist, it will simply return a pointer to the ust | |
4195 | * app session. | |
4196 | */ | |
88e3c2f5 JG |
4197 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, |
4198 | &session_was_created); | |
3d8ca23b DG |
4199 | if (ret < 0) { |
4200 | switch (ret) { | |
4201 | case -ENOTCONN: | |
4202 | /* | |
88e3c2f5 JG |
4203 | * The application's socket is not valid. Either a bad |
4204 | * socket or a timeout on it. We can't inform the caller | |
4205 | * that for a specific app, the session failed so lets | |
4206 | * continue here; it is not an error. | |
3d8ca23b | 4207 | */ |
88e3c2f5 JG |
4208 | ret = 0; |
4209 | goto error_rcu_unlock; | |
3d8ca23b DG |
4210 | case -ENOMEM: |
4211 | default: | |
4212 | goto error_rcu_unlock; | |
4213 | } | |
48842b30 | 4214 | } |
b161602a MD |
4215 | |
4216 | if (ua_sess->deleted) { | |
b161602a MD |
4217 | continue; |
4218 | } | |
88e3c2f5 JG |
4219 | ret = ust_app_channel_create(usess, ua_sess, uchan, app, NULL); |
4220 | if (ret) { | |
4221 | if (session_was_created) { | |
d0b96690 | 4222 | destroy_app_session(app, ua_sess); |
3d8ca23b | 4223 | } |
d7679774 | 4224 | /* Continue to the next application. */ |
48842b30 | 4225 | } |
48842b30 | 4226 | } |
5b4a0ec0 | 4227 | |
95e047ff | 4228 | error_rcu_unlock: |
48842b30 | 4229 | rcu_read_unlock(); |
3c14c33f | 4230 | return ret; |
48842b30 DG |
4231 | } |
4232 | ||
5b4a0ec0 | 4233 | /* |
edb67388 | 4234 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4235 | */ |
35a9059d | 4236 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4237 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4238 | { | |
4239 | int ret = 0; | |
bec39940 | 4240 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4241 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4242 | struct ust_app *app; |
4243 | struct ust_app_session *ua_sess; | |
4244 | struct ust_app_channel *ua_chan; | |
4245 | struct ust_app_event *ua_event; | |
48842b30 | 4246 | |
88e3c2f5 | 4247 | assert(usess->active); |
d9bf3ca4 | 4248 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4249 | uevent->attr.name, usess->id); |
48842b30 | 4250 | |
edb67388 DG |
4251 | /* |
4252 | * NOTE: At this point, this function is called only if the session and | |
4253 | * channel passed are already created for all apps. and enabled on the | |
4254 | * tracer also. | |
4255 | */ | |
4256 | ||
48842b30 | 4257 | rcu_read_lock(); |
421cb601 DG |
4258 | |
4259 | /* For all registered applications */ | |
852d0037 | 4260 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4261 | if (!app->compatible) { |
4262 | /* | |
4263 | * TODO: In time, we should notice the caller of this error by | |
4264 | * telling him that this is a version error. | |
4265 | */ | |
4266 | continue; | |
4267 | } | |
edb67388 | 4268 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4269 | if (!ua_sess) { |
4270 | /* The application has problem or is probably dead. */ | |
4271 | continue; | |
4272 | } | |
ba767faf | 4273 | |
d0b96690 DG |
4274 | pthread_mutex_lock(&ua_sess->lock); |
4275 | ||
b161602a MD |
4276 | if (ua_sess->deleted) { |
4277 | pthread_mutex_unlock(&ua_sess->lock); | |
4278 | continue; | |
4279 | } | |
4280 | ||
edb67388 | 4281 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4282 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4283 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4284 | /* |
4285 | * It is possible that the channel cannot be found is | |
4286 | * the channel/event creation occurs concurrently with | |
4287 | * an application exit. | |
4288 | */ | |
4289 | if (!ua_chan_node) { | |
4290 | pthread_mutex_unlock(&ua_sess->lock); | |
4291 | continue; | |
4292 | } | |
edb67388 DG |
4293 | |
4294 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4295 | ||
18eace3b DG |
4296 | /* Get event node */ |
4297 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4298 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4299 | if (ua_event == NULL) { |
7f79d3a1 | 4300 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4301 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4302 | goto next_app; |
35a9059d | 4303 | } |
35a9059d DG |
4304 | |
4305 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4306 | if (ret < 0) { | |
d0b96690 | 4307 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4308 | goto error; |
48842b30 | 4309 | } |
d0b96690 DG |
4310 | next_app: |
4311 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4312 | } |
4313 | ||
7f79d3a1 | 4314 | error: |
edb67388 | 4315 | rcu_read_unlock(); |
edb67388 DG |
4316 | return ret; |
4317 | } | |
4318 | ||
4319 | /* | |
4320 | * For a specific existing UST session and UST channel, creates the event for | |
4321 | * all registered apps. | |
4322 | */ | |
35a9059d | 4323 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4324 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4325 | { | |
4326 | int ret = 0; | |
bec39940 DG |
4327 | struct lttng_ht_iter iter, uiter; |
4328 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4329 | struct ust_app *app; |
4330 | struct ust_app_session *ua_sess; | |
4331 | struct ust_app_channel *ua_chan; | |
4332 | ||
88e3c2f5 | 4333 | assert(usess->active); |
d9bf3ca4 | 4334 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4335 | uevent->attr.name, usess->id); |
edb67388 | 4336 | |
edb67388 DG |
4337 | rcu_read_lock(); |
4338 | ||
4339 | /* For all registered applications */ | |
852d0037 | 4340 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4341 | if (!app->compatible) { |
4342 | /* | |
4343 | * TODO: In time, we should notice the caller of this error by | |
4344 | * telling him that this is a version error. | |
4345 | */ | |
4346 | continue; | |
4347 | } | |
edb67388 | 4348 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4349 | if (!ua_sess) { |
4350 | /* The application has problem or is probably dead. */ | |
4351 | continue; | |
4352 | } | |
48842b30 | 4353 | |
d0b96690 | 4354 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4355 | |
4356 | if (ua_sess->deleted) { | |
4357 | pthread_mutex_unlock(&ua_sess->lock); | |
4358 | continue; | |
4359 | } | |
4360 | ||
48842b30 | 4361 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4362 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4363 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4364 | /* If the channel is not found, there is a code flow error */ |
4365 | assert(ua_chan_node); | |
4366 | ||
48842b30 DG |
4367 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4368 | ||
edb67388 | 4369 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4370 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4371 | if (ret < 0) { |
49c336c1 | 4372 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4373 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4374 | break; | |
4375 | } | |
4376 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4377 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4378 | continue; |
48842b30 | 4379 | } |
48842b30 | 4380 | } |
5b4a0ec0 | 4381 | |
48842b30 | 4382 | rcu_read_unlock(); |
48842b30 DG |
4383 | return ret; |
4384 | } | |
4385 | ||
5b4a0ec0 DG |
4386 | /* |
4387 | * Start tracing for a specific UST session and app. | |
fad1ed2f JR |
4388 | * |
4389 | * Called with UST app session lock held. | |
4390 | * | |
5b4a0ec0 | 4391 | */ |
b34cbebf | 4392 | static |
421cb601 | 4393 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4394 | { |
4395 | int ret = 0; | |
48842b30 | 4396 | struct ust_app_session *ua_sess; |
48842b30 | 4397 | |
852d0037 | 4398 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4399 | |
509cbaf8 MD |
4400 | rcu_read_lock(); |
4401 | ||
e0c7ec2b DG |
4402 | if (!app->compatible) { |
4403 | goto end; | |
4404 | } | |
4405 | ||
421cb601 DG |
4406 | ua_sess = lookup_session_by_app(usess, app); |
4407 | if (ua_sess == NULL) { | |
d42f20df DG |
4408 | /* The session is in teardown process. Ignore and continue. */ |
4409 | goto end; | |
421cb601 | 4410 | } |
48842b30 | 4411 | |
d0b96690 DG |
4412 | pthread_mutex_lock(&ua_sess->lock); |
4413 | ||
b161602a MD |
4414 | if (ua_sess->deleted) { |
4415 | pthread_mutex_unlock(&ua_sess->lock); | |
4416 | goto end; | |
4417 | } | |
4418 | ||
aea829b3 DG |
4419 | /* Upon restart, we skip the setup, already done */ |
4420 | if (ua_sess->started) { | |
8be98f9a | 4421 | goto skip_setup; |
aea829b3 | 4422 | } |
8be98f9a | 4423 | |
d65d2de8 DG |
4424 | /* |
4425 | * Create the metadata for the application. This returns gracefully if a | |
4426 | * metadata was already set for the session. | |
4427 | */ | |
ad7a9107 | 4428 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 4429 | if (ret < 0) { |
d0b96690 | 4430 | goto error_unlock; |
421cb601 | 4431 | } |
48842b30 | 4432 | |
840cb59c | 4433 | health_code_update(); |
86acf0da | 4434 | |
8be98f9a | 4435 | skip_setup: |
a945cdc7 | 4436 | /* This starts the UST tracing */ |
fb45065e | 4437 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4438 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4439 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4440 | if (ret < 0) { |
ffe60014 DG |
4441 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4442 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4443 | app->pid, ret); | |
4444 | } else { | |
4445 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4446 | /* |
4447 | * This is normal behavior, an application can die during the | |
4448 | * creation process. Don't report an error so the execution can | |
4449 | * continue normally. | |
4450 | */ | |
4451 | pthread_mutex_unlock(&ua_sess->lock); | |
4452 | goto end; | |
ffe60014 | 4453 | } |
d0b96690 | 4454 | goto error_unlock; |
421cb601 | 4455 | } |
5b4a0ec0 | 4456 | |
55c3953d DG |
4457 | /* Indicate that the session has been started once */ |
4458 | ua_sess->started = 1; | |
4459 | ||
d0b96690 DG |
4460 | pthread_mutex_unlock(&ua_sess->lock); |
4461 | ||
840cb59c | 4462 | health_code_update(); |
86acf0da | 4463 | |
421cb601 | 4464 | /* Quiescent wait after starting trace */ |
fb45065e | 4465 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4466 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4467 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4468 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4469 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4470 | app->pid, ret); | |
4471 | } | |
48842b30 | 4472 | |
e0c7ec2b DG |
4473 | end: |
4474 | rcu_read_unlock(); | |
840cb59c | 4475 | health_code_update(); |
421cb601 | 4476 | return 0; |
48842b30 | 4477 | |
d0b96690 DG |
4478 | error_unlock: |
4479 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4480 | rcu_read_unlock(); |
840cb59c | 4481 | health_code_update(); |
421cb601 DG |
4482 | return -1; |
4483 | } | |
48842b30 | 4484 | |
8be98f9a MD |
4485 | /* |
4486 | * Stop tracing for a specific UST session and app. | |
4487 | */ | |
b34cbebf | 4488 | static |
8be98f9a MD |
4489 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4490 | { | |
4491 | int ret = 0; | |
4492 | struct ust_app_session *ua_sess; | |
7972aab2 | 4493 | struct ust_registry_session *registry; |
8be98f9a | 4494 | |
852d0037 | 4495 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4496 | |
4497 | rcu_read_lock(); | |
4498 | ||
e0c7ec2b | 4499 | if (!app->compatible) { |
d88aee68 | 4500 | goto end_no_session; |
e0c7ec2b DG |
4501 | } |
4502 | ||
8be98f9a MD |
4503 | ua_sess = lookup_session_by_app(usess, app); |
4504 | if (ua_sess == NULL) { | |
d88aee68 | 4505 | goto end_no_session; |
8be98f9a MD |
4506 | } |
4507 | ||
d88aee68 DG |
4508 | pthread_mutex_lock(&ua_sess->lock); |
4509 | ||
b161602a MD |
4510 | if (ua_sess->deleted) { |
4511 | pthread_mutex_unlock(&ua_sess->lock); | |
4512 | goto end_no_session; | |
4513 | } | |
4514 | ||
9bc07046 DG |
4515 | /* |
4516 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4517 | * that was never started. It's possible since we can have a fail start |
4518 | * from either the application manager thread or the command thread. Simply | |
4519 | * indicate that this is a stop error. | |
9bc07046 | 4520 | */ |
f9dfc3d9 | 4521 | if (!ua_sess->started) { |
c45536e1 DG |
4522 | goto error_rcu_unlock; |
4523 | } | |
7db205b5 | 4524 | |
840cb59c | 4525 | health_code_update(); |
86acf0da | 4526 | |
9d6c7d3f | 4527 | /* This inhibits UST tracing */ |
fb45065e | 4528 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4529 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 4530 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 4531 | if (ret < 0) { |
ffe60014 DG |
4532 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4533 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4534 | app->pid, ret); | |
4535 | } else { | |
4536 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4537 | /* |
4538 | * This is normal behavior, an application can die during the | |
4539 | * creation process. Don't report an error so the execution can | |
4540 | * continue normally. | |
4541 | */ | |
4542 | goto end_unlock; | |
ffe60014 | 4543 | } |
9d6c7d3f DG |
4544 | goto error_rcu_unlock; |
4545 | } | |
4546 | ||
840cb59c | 4547 | health_code_update(); |
86acf0da | 4548 | |
9d6c7d3f | 4549 | /* Quiescent wait after stopping trace */ |
fb45065e | 4550 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4551 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4552 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4553 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4554 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4555 | app->pid, ret); | |
4556 | } | |
9d6c7d3f | 4557 | |
840cb59c | 4558 | health_code_update(); |
86acf0da | 4559 | |
b34cbebf | 4560 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
4561 | |
4562 | /* The UST app session is held registry shall not be null. */ | |
b34cbebf | 4563 | assert(registry); |
1b532a60 | 4564 | |
ce34fcd0 MD |
4565 | /* Push metadata for application before freeing the application. */ |
4566 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4567 | |
3757b385 | 4568 | end_unlock: |
b34cbebf MD |
4569 | pthread_mutex_unlock(&ua_sess->lock); |
4570 | end_no_session: | |
4571 | rcu_read_unlock(); | |
4572 | health_code_update(); | |
4573 | return 0; | |
4574 | ||
4575 | error_rcu_unlock: | |
4576 | pthread_mutex_unlock(&ua_sess->lock); | |
4577 | rcu_read_unlock(); | |
4578 | health_code_update(); | |
4579 | return -1; | |
4580 | } | |
4581 | ||
b34cbebf | 4582 | static |
c4b88406 MD |
4583 | int ust_app_flush_app_session(struct ust_app *app, |
4584 | struct ust_app_session *ua_sess) | |
b34cbebf | 4585 | { |
c4b88406 | 4586 | int ret, retval = 0; |
b34cbebf | 4587 | struct lttng_ht_iter iter; |
b34cbebf | 4588 | struct ust_app_channel *ua_chan; |
c4b88406 | 4589 | struct consumer_socket *socket; |
b34cbebf | 4590 | |
c4b88406 | 4591 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4592 | |
4593 | rcu_read_lock(); | |
4594 | ||
4595 | if (!app->compatible) { | |
c4b88406 | 4596 | goto end_not_compatible; |
b34cbebf MD |
4597 | } |
4598 | ||
4599 | pthread_mutex_lock(&ua_sess->lock); | |
4600 | ||
b161602a MD |
4601 | if (ua_sess->deleted) { |
4602 | goto end_deleted; | |
4603 | } | |
4604 | ||
b34cbebf MD |
4605 | health_code_update(); |
4606 | ||
9d6c7d3f | 4607 | /* Flushing buffers */ |
c4b88406 MD |
4608 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4609 | ua_sess->consumer); | |
ce34fcd0 MD |
4610 | |
4611 | /* Flush buffers and push metadata. */ | |
4612 | switch (ua_sess->buffer_type) { | |
4613 | case LTTNG_BUFFER_PER_PID: | |
4614 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4615 | node.node) { | |
4616 | health_code_update(); | |
ce34fcd0 MD |
4617 | ret = consumer_flush_channel(socket, ua_chan->key); |
4618 | if (ret) { | |
4619 | ERR("Error flushing consumer channel"); | |
4620 | retval = -1; | |
4621 | continue; | |
4622 | } | |
8be98f9a | 4623 | } |
ce34fcd0 MD |
4624 | break; |
4625 | case LTTNG_BUFFER_PER_UID: | |
4626 | default: | |
4627 | assert(0); | |
4628 | break; | |
8be98f9a | 4629 | } |
8be98f9a | 4630 | |
840cb59c | 4631 | health_code_update(); |
86acf0da | 4632 | |
b161602a | 4633 | end_deleted: |
d88aee68 | 4634 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4635 | |
c4b88406 MD |
4636 | end_not_compatible: |
4637 | rcu_read_unlock(); | |
4638 | health_code_update(); | |
4639 | return retval; | |
4640 | } | |
4641 | ||
4642 | /* | |
ce34fcd0 MD |
4643 | * Flush buffers for all applications for a specific UST session. |
4644 | * Called with UST session lock held. | |
c4b88406 MD |
4645 | */ |
4646 | static | |
ce34fcd0 | 4647 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4648 | |
4649 | { | |
99b1411c | 4650 | int ret = 0; |
c4b88406 | 4651 | |
ce34fcd0 | 4652 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4653 | |
4654 | rcu_read_lock(); | |
4655 | ||
ce34fcd0 MD |
4656 | /* Flush buffers and push metadata. */ |
4657 | switch (usess->buffer_type) { | |
4658 | case LTTNG_BUFFER_PER_UID: | |
4659 | { | |
4660 | struct buffer_reg_uid *reg; | |
4661 | struct lttng_ht_iter iter; | |
4662 | ||
4663 | /* Flush all per UID buffers associated to that session. */ | |
4664 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4665 | struct ust_registry_session *ust_session_reg; | |
4666 | struct buffer_reg_channel *reg_chan; | |
4667 | struct consumer_socket *socket; | |
4668 | ||
4669 | /* Get consumer socket to use to push the metadata.*/ | |
4670 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4671 | usess->consumer); | |
4672 | if (!socket) { | |
4673 | /* Ignore request if no consumer is found for the session. */ | |
4674 | continue; | |
4675 | } | |
4676 | ||
4677 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4678 | reg_chan, node.node) { | |
4679 | /* | |
4680 | * The following call will print error values so the return | |
4681 | * code is of little importance because whatever happens, we | |
4682 | * have to try them all. | |
4683 | */ | |
4684 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4685 | } | |
4686 | ||
4687 | ust_session_reg = reg->registry->reg.ust; | |
4688 | /* Push metadata. */ | |
4689 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4690 | } | |
ce34fcd0 MD |
4691 | break; |
4692 | } | |
4693 | case LTTNG_BUFFER_PER_PID: | |
4694 | { | |
4695 | struct ust_app_session *ua_sess; | |
4696 | struct lttng_ht_iter iter; | |
4697 | struct ust_app *app; | |
4698 | ||
4699 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4700 | ua_sess = lookup_session_by_app(usess, app); | |
4701 | if (ua_sess == NULL) { | |
4702 | continue; | |
4703 | } | |
4704 | (void) ust_app_flush_app_session(app, ua_sess); | |
4705 | } | |
4706 | break; | |
4707 | } | |
4708 | default: | |
99b1411c | 4709 | ret = -1; |
ce34fcd0 MD |
4710 | assert(0); |
4711 | break; | |
c4b88406 | 4712 | } |
c4b88406 | 4713 | |
7db205b5 | 4714 | rcu_read_unlock(); |
840cb59c | 4715 | health_code_update(); |
c4b88406 | 4716 | return ret; |
8be98f9a MD |
4717 | } |
4718 | ||
0dd01979 MD |
4719 | static |
4720 | int ust_app_clear_quiescent_app_session(struct ust_app *app, | |
4721 | struct ust_app_session *ua_sess) | |
4722 | { | |
4723 | int ret = 0; | |
4724 | struct lttng_ht_iter iter; | |
4725 | struct ust_app_channel *ua_chan; | |
4726 | struct consumer_socket *socket; | |
4727 | ||
4728 | DBG("Clearing stream quiescent state for ust app pid %d", app->pid); | |
4729 | ||
4730 | rcu_read_lock(); | |
4731 | ||
4732 | if (!app->compatible) { | |
4733 | goto end_not_compatible; | |
4734 | } | |
4735 | ||
4736 | pthread_mutex_lock(&ua_sess->lock); | |
4737 | ||
4738 | if (ua_sess->deleted) { | |
4739 | goto end_unlock; | |
4740 | } | |
4741 | ||
4742 | health_code_update(); | |
4743 | ||
4744 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
4745 | ua_sess->consumer); | |
4746 | if (!socket) { | |
4747 | ERR("Failed to find consumer (%" PRIu32 ") socket", | |
4748 | app->bits_per_long); | |
4749 | ret = -1; | |
4750 | goto end_unlock; | |
4751 | } | |
4752 | ||
4753 | /* Clear quiescent state. */ | |
4754 | switch (ua_sess->buffer_type) { | |
4755 | case LTTNG_BUFFER_PER_PID: | |
4756 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, | |
4757 | ua_chan, node.node) { | |
4758 | health_code_update(); | |
4759 | ret = consumer_clear_quiescent_channel(socket, | |
4760 | ua_chan->key); | |
4761 | if (ret) { | |
4762 | ERR("Error clearing quiescent state for consumer channel"); | |
4763 | ret = -1; | |
4764 | continue; | |
4765 | } | |
4766 | } | |
4767 | break; | |
4768 | case LTTNG_BUFFER_PER_UID: | |
4769 | default: | |
4770 | assert(0); | |
4771 | ret = -1; | |
4772 | break; | |
4773 | } | |
4774 | ||
4775 | health_code_update(); | |
4776 | ||
4777 | end_unlock: | |
4778 | pthread_mutex_unlock(&ua_sess->lock); | |
4779 | ||
4780 | end_not_compatible: | |
4781 | rcu_read_unlock(); | |
4782 | health_code_update(); | |
4783 | return ret; | |
4784 | } | |
4785 | ||
4786 | /* | |
4787 | * Clear quiescent state in each stream for all applications for a | |
4788 | * specific UST session. | |
4789 | * Called with UST session lock held. | |
4790 | */ | |
4791 | static | |
4792 | int ust_app_clear_quiescent_session(struct ltt_ust_session *usess) | |
4793 | ||
4794 | { | |
4795 | int ret = 0; | |
4796 | ||
4797 | DBG("Clearing stream quiescent state for all ust apps"); | |
4798 | ||
4799 | rcu_read_lock(); | |
4800 | ||
4801 | switch (usess->buffer_type) { | |
4802 | case LTTNG_BUFFER_PER_UID: | |
4803 | { | |
4804 | struct lttng_ht_iter iter; | |
4805 | struct buffer_reg_uid *reg; | |
4806 | ||
4807 | /* | |
4808 | * Clear quiescent for all per UID buffers associated to | |
4809 | * that session. | |
4810 | */ | |
4811 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4812 | struct consumer_socket *socket; | |
4813 | struct buffer_reg_channel *reg_chan; | |
4814 | ||
4815 | /* Get associated consumer socket.*/ | |
4816 | socket = consumer_find_socket_by_bitness( | |
4817 | reg->bits_per_long, usess->consumer); | |
4818 | if (!socket) { | |
4819 | /* | |
4820 | * Ignore request if no consumer is found for | |
4821 | * the session. | |
4822 | */ | |
4823 | continue; | |
4824 | } | |
4825 | ||
4826 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
4827 | &iter.iter, reg_chan, node.node) { | |
4828 | /* | |
4829 | * The following call will print error values so | |
4830 | * the return code is of little importance | |
4831 | * because whatever happens, we have to try them | |
4832 | * all. | |
4833 | */ | |
4834 | (void) consumer_clear_quiescent_channel(socket, | |
4835 | reg_chan->consumer_key); | |
4836 | } | |
4837 | } | |
4838 | break; | |
4839 | } | |
4840 | case LTTNG_BUFFER_PER_PID: | |
4841 | { | |
4842 | struct ust_app_session *ua_sess; | |
4843 | struct lttng_ht_iter iter; | |
4844 | struct ust_app *app; | |
4845 | ||
4846 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
4847 | pid_n.node) { | |
4848 | ua_sess = lookup_session_by_app(usess, app); | |
4849 | if (ua_sess == NULL) { | |
4850 | continue; | |
4851 | } | |
4852 | (void) ust_app_clear_quiescent_app_session(app, | |
4853 | ua_sess); | |
4854 | } | |
4855 | break; | |
4856 | } | |
4857 | default: | |
4858 | ret = -1; | |
4859 | assert(0); | |
4860 | break; | |
4861 | } | |
4862 | ||
4863 | rcu_read_unlock(); | |
4864 | health_code_update(); | |
4865 | return ret; | |
4866 | } | |
4867 | ||
84cd17c6 MD |
4868 | /* |
4869 | * Destroy a specific UST session in apps. | |
4870 | */ | |
3353de95 | 4871 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4872 | { |
ffe60014 | 4873 | int ret; |
84cd17c6 | 4874 | struct ust_app_session *ua_sess; |
bec39940 | 4875 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4876 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4877 | |
852d0037 | 4878 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4879 | |
4880 | rcu_read_lock(); | |
4881 | ||
e0c7ec2b DG |
4882 | if (!app->compatible) { |
4883 | goto end; | |
4884 | } | |
4885 | ||
84cd17c6 | 4886 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4887 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4888 | if (node == NULL) { |
d42f20df DG |
4889 | /* Session is being or is deleted. */ |
4890 | goto end; | |
84cd17c6 MD |
4891 | } |
4892 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4893 | |
840cb59c | 4894 | health_code_update(); |
d0b96690 | 4895 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4896 | |
840cb59c | 4897 | health_code_update(); |
7db205b5 | 4898 | |
84cd17c6 | 4899 | /* Quiescent wait after stopping trace */ |
fb45065e | 4900 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4901 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4902 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4903 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4904 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4905 | app->pid, ret); | |
4906 | } | |
e0c7ec2b DG |
4907 | end: |
4908 | rcu_read_unlock(); | |
840cb59c | 4909 | health_code_update(); |
84cd17c6 | 4910 | return 0; |
84cd17c6 MD |
4911 | } |
4912 | ||
5b4a0ec0 DG |
4913 | /* |
4914 | * Start tracing for the UST session. | |
4915 | */ | |
421cb601 DG |
4916 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4917 | { | |
bec39940 | 4918 | struct lttng_ht_iter iter; |
421cb601 | 4919 | struct ust_app *app; |
48842b30 | 4920 | |
421cb601 DG |
4921 | DBG("Starting all UST traces"); |
4922 | ||
bb2452c8 MD |
4923 | /* |
4924 | * Even though the start trace might fail, flag this session active so | |
4925 | * other application coming in are started by default. | |
4926 | */ | |
4927 | usess->active = 1; | |
4928 | ||
421cb601 | 4929 | rcu_read_lock(); |
421cb601 | 4930 | |
0dd01979 MD |
4931 | /* |
4932 | * In a start-stop-start use-case, we need to clear the quiescent state | |
4933 | * of each channel set by the prior stop command, thus ensuring that a | |
4934 | * following stop or destroy is sure to grab a timestamp_end near those | |
4935 | * operations, even if the packet is empty. | |
4936 | */ | |
4937 | (void) ust_app_clear_quiescent_session(usess); | |
4938 | ||
0498a00c MD |
4939 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4940 | ust_app_global_update(usess, app); | |
4941 | } | |
4942 | ||
48842b30 DG |
4943 | rcu_read_unlock(); |
4944 | ||
4945 | return 0; | |
4946 | } | |
487cf67c | 4947 | |
8be98f9a MD |
4948 | /* |
4949 | * Start tracing for the UST session. | |
ce34fcd0 | 4950 | * Called with UST session lock held. |
8be98f9a MD |
4951 | */ |
4952 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4953 | { | |
4954 | int ret = 0; | |
bec39940 | 4955 | struct lttng_ht_iter iter; |
8be98f9a MD |
4956 | struct ust_app *app; |
4957 | ||
4958 | DBG("Stopping all UST traces"); | |
4959 | ||
bb2452c8 MD |
4960 | /* |
4961 | * Even though the stop trace might fail, flag this session inactive so | |
4962 | * other application coming in are not started by default. | |
4963 | */ | |
4964 | usess->active = 0; | |
4965 | ||
8be98f9a MD |
4966 | rcu_read_lock(); |
4967 | ||
b34cbebf MD |
4968 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4969 | ret = ust_app_stop_trace(usess, app); | |
4970 | if (ret < 0) { | |
4971 | /* Continue to next apps even on error */ | |
4972 | continue; | |
4973 | } | |
4974 | } | |
4975 | ||
ce34fcd0 | 4976 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4977 | |
4978 | rcu_read_unlock(); | |
4979 | ||
4980 | return 0; | |
4981 | } | |
4982 | ||
84cd17c6 MD |
4983 | /* |
4984 | * Destroy app UST session. | |
4985 | */ | |
4986 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4987 | { | |
4988 | int ret = 0; | |
bec39940 | 4989 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4990 | struct ust_app *app; |
4991 | ||
4992 | DBG("Destroy all UST traces"); | |
4993 | ||
4994 | rcu_read_lock(); | |
4995 | ||
852d0037 | 4996 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4997 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4998 | if (ret < 0) { |
4999 | /* Continue to next apps even on error */ | |
5000 | continue; | |
5001 | } | |
5002 | } | |
5003 | ||
5004 | rcu_read_unlock(); | |
5005 | ||
5006 | return 0; | |
5007 | } | |
5008 | ||
88e3c2f5 | 5009 | /* The ua_sess lock must be held by the caller. */ |
a9ad0c8f | 5010 | static |
88e3c2f5 JG |
5011 | int find_or_create_ust_app_channel( |
5012 | struct ltt_ust_session *usess, | |
5013 | struct ust_app_session *ua_sess, | |
5014 | struct ust_app *app, | |
5015 | struct ltt_ust_channel *uchan, | |
5016 | struct ust_app_channel **ua_chan) | |
487cf67c | 5017 | { |
55c54cce | 5018 | int ret = 0; |
88e3c2f5 JG |
5019 | struct lttng_ht_iter iter; |
5020 | struct lttng_ht_node_str *ua_chan_node; | |
5021 | ||
5022 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &iter); | |
5023 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
5024 | if (ua_chan_node) { | |
5025 | *ua_chan = caa_container_of(ua_chan_node, | |
5026 | struct ust_app_channel, node); | |
5027 | goto end; | |
5028 | } | |
5029 | ||
5030 | ret = ust_app_channel_create(usess, ua_sess, uchan, app, ua_chan); | |
5031 | if (ret) { | |
5032 | goto end; | |
5033 | } | |
5034 | end: | |
5035 | return ret; | |
5036 | } | |
5037 | ||
5038 | static | |
5039 | int ust_app_channel_synchronize_event(struct ust_app_channel *ua_chan, | |
5040 | struct ltt_ust_event *uevent, struct ust_app_session *ua_sess, | |
5041 | struct ust_app *app) | |
5042 | { | |
5043 | int ret = 0; | |
5044 | struct ust_app_event *ua_event = NULL; | |
5045 | ||
5046 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
5047 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); | |
5048 | if (!ua_event) { | |
5049 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); | |
5050 | if (ret < 0) { | |
5051 | goto end; | |
5052 | } | |
5053 | } else { | |
5054 | if (ua_event->enabled != uevent->enabled) { | |
5055 | ret = uevent->enabled ? | |
5056 | enable_ust_app_event(ua_sess, ua_event, app) : | |
5057 | disable_ust_app_event(ua_sess, ua_event, app); | |
5058 | } | |
5059 | } | |
5060 | ||
5061 | end: | |
5062 | return ret; | |
5063 | } | |
5064 | ||
5065 | /* | |
5066 | * The caller must ensure that the application is compatible and is tracked | |
5067 | * by the PID tracker. | |
5068 | */ | |
5069 | static | |
5070 | void ust_app_synchronize(struct ltt_ust_session *usess, | |
5071 | struct ust_app *app) | |
5072 | { | |
5073 | int ret = 0; | |
5074 | struct cds_lfht_iter uchan_iter; | |
5075 | struct ltt_ust_channel *uchan; | |
3d8ca23b | 5076 | struct ust_app_session *ua_sess = NULL; |
1f3580c7 | 5077 | |
88e3c2f5 JG |
5078 | /* |
5079 | * The application's configuration should only be synchronized for | |
5080 | * active sessions. | |
5081 | */ | |
5082 | assert(usess->active); | |
5083 | ||
5084 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, NULL); | |
3d8ca23b DG |
5085 | if (ret < 0) { |
5086 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
5087 | goto error; |
5088 | } | |
3d8ca23b | 5089 | assert(ua_sess); |
487cf67c | 5090 | |
d0b96690 | 5091 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5092 | if (ua_sess->deleted) { |
5093 | pthread_mutex_unlock(&ua_sess->lock); | |
5094 | goto end; | |
5095 | } | |
5096 | ||
88e3c2f5 JG |
5097 | rcu_read_lock(); |
5098 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &uchan_iter, | |
5099 | uchan, node.node) { | |
5100 | struct ust_app_channel *ua_chan; | |
5101 | struct cds_lfht_iter uevent_iter; | |
5102 | struct ltt_ust_event *uevent; | |
487cf67c | 5103 | |
31746f93 | 5104 | /* |
88e3c2f5 JG |
5105 | * Search for a matching ust_app_channel. If none is found, |
5106 | * create it. Creating the channel will cause the ua_chan | |
5107 | * structure to be allocated, the channel buffers to be | |
5108 | * allocated (if necessary) and sent to the application, and | |
5109 | * all enabled contexts will be added to the channel. | |
31746f93 | 5110 | */ |
88e3c2f5 JG |
5111 | ret = find_or_create_ust_app_channel(usess, ua_sess, |
5112 | app, uchan, &ua_chan); | |
5113 | if (ret) { | |
5114 | /* Tracer is probably gone or ENOMEM. */ | |
5115 | goto error_unlock; | |
727d5404 DG |
5116 | } |
5117 | ||
88e3c2f5 JG |
5118 | if (!ua_chan) { |
5119 | /* ua_chan will be NULL for the metadata channel */ | |
5120 | continue; | |
5121 | } | |
727d5404 | 5122 | |
88e3c2f5 | 5123 | cds_lfht_for_each_entry(uchan->events->ht, &uevent_iter, uevent, |
bec39940 | 5124 | node.node) { |
88e3c2f5 JG |
5125 | ret = ust_app_channel_synchronize_event(ua_chan, |
5126 | uevent, ua_sess, app); | |
5127 | if (ret) { | |
d0b96690 | 5128 | goto error_unlock; |
487cf67c | 5129 | } |
36dc12cc | 5130 | } |
d0b96690 | 5131 | |
88e3c2f5 JG |
5132 | if (ua_chan->enabled != uchan->enabled) { |
5133 | ret = uchan->enabled ? | |
5134 | enable_ust_app_channel(ua_sess, uchan, app) : | |
5135 | disable_ust_app_channel(ua_sess, ua_chan, app); | |
5136 | if (ret) { | |
5137 | goto error_unlock; | |
5138 | } | |
5139 | } | |
36dc12cc | 5140 | } |
88e3c2f5 | 5141 | rcu_read_unlock(); |
0498a00c | 5142 | |
a9ad0c8f | 5143 | end: |
88e3c2f5 | 5144 | pthread_mutex_unlock(&ua_sess->lock); |
ffe60014 | 5145 | /* Everything went well at this point. */ |
ffe60014 DG |
5146 | return; |
5147 | ||
d0b96690 | 5148 | error_unlock: |
88e3c2f5 | 5149 | rcu_read_unlock(); |
d0b96690 | 5150 | pthread_mutex_unlock(&ua_sess->lock); |
487cf67c | 5151 | error: |
ffe60014 | 5152 | if (ua_sess) { |
d0b96690 | 5153 | destroy_app_session(app, ua_sess); |
ffe60014 | 5154 | } |
487cf67c DG |
5155 | return; |
5156 | } | |
55cc08a6 | 5157 | |
a9ad0c8f MD |
5158 | static |
5159 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
5160 | { | |
5161 | struct ust_app_session *ua_sess; | |
5162 | ||
5163 | ua_sess = lookup_session_by_app(usess, app); | |
5164 | if (ua_sess == NULL) { | |
5165 | return; | |
5166 | } | |
5167 | destroy_app_session(app, ua_sess); | |
5168 | } | |
5169 | ||
5170 | /* | |
5171 | * Add channels/events from UST global domain to registered apps at sock. | |
5172 | * | |
5173 | * Called with session lock held. | |
5174 | * Called with RCU read-side lock held. | |
5175 | */ | |
5176 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
5177 | { | |
5178 | assert(usess); | |
88e3c2f5 | 5179 | assert(usess->active); |
a9ad0c8f MD |
5180 | |
5181 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
5182 | app->sock, usess->id); | |
5183 | ||
5184 | if (!app->compatible) { | |
5185 | return; | |
5186 | } | |
a9ad0c8f | 5187 | if (trace_ust_pid_tracker_lookup(usess, app->pid)) { |
88e3c2f5 JG |
5188 | /* |
5189 | * Synchronize the application's internal tracing configuration | |
5190 | * and start tracing. | |
5191 | */ | |
5192 | ust_app_synchronize(usess, app); | |
5193 | ust_app_start_trace(usess, app); | |
a9ad0c8f MD |
5194 | } else { |
5195 | ust_app_global_destroy(usess, app); | |
5196 | } | |
5197 | } | |
5198 | ||
5199 | /* | |
5200 | * Called with session lock held. | |
5201 | */ | |
5202 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
5203 | { | |
5204 | struct lttng_ht_iter iter; | |
5205 | struct ust_app *app; | |
5206 | ||
5207 | rcu_read_lock(); | |
5208 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5209 | ust_app_global_update(usess, app); | |
5210 | } | |
5211 | rcu_read_unlock(); | |
5212 | } | |
5213 | ||
55cc08a6 DG |
5214 | /* |
5215 | * Add context to a specific channel for global UST domain. | |
5216 | */ | |
5217 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
5218 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
5219 | { | |
5220 | int ret = 0; | |
bec39940 DG |
5221 | struct lttng_ht_node_str *ua_chan_node; |
5222 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
5223 | struct ust_app_channel *ua_chan = NULL; |
5224 | struct ust_app_session *ua_sess; | |
5225 | struct ust_app *app; | |
5226 | ||
88e3c2f5 | 5227 | assert(usess->active); |
0498a00c | 5228 | |
55cc08a6 | 5229 | rcu_read_lock(); |
852d0037 | 5230 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
5231 | if (!app->compatible) { |
5232 | /* | |
5233 | * TODO: In time, we should notice the caller of this error by | |
5234 | * telling him that this is a version error. | |
5235 | */ | |
5236 | continue; | |
5237 | } | |
55cc08a6 DG |
5238 | ua_sess = lookup_session_by_app(usess, app); |
5239 | if (ua_sess == NULL) { | |
5240 | continue; | |
5241 | } | |
5242 | ||
d0b96690 | 5243 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5244 | |
5245 | if (ua_sess->deleted) { | |
5246 | pthread_mutex_unlock(&ua_sess->lock); | |
5247 | continue; | |
5248 | } | |
5249 | ||
55cc08a6 | 5250 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5251 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
5252 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 5253 | if (ua_chan_node == NULL) { |
d0b96690 | 5254 | goto next_app; |
55cc08a6 DG |
5255 | } |
5256 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
5257 | node); | |
c9edf082 | 5258 | ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app); |
55cc08a6 | 5259 | if (ret < 0) { |
d0b96690 | 5260 | goto next_app; |
55cc08a6 | 5261 | } |
d0b96690 DG |
5262 | next_app: |
5263 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
5264 | } |
5265 | ||
55cc08a6 | 5266 | rcu_read_unlock(); |
76d45b40 DG |
5267 | return ret; |
5268 | } | |
7f79d3a1 | 5269 | |
d0b96690 DG |
5270 | /* |
5271 | * Receive registration and populate the given msg structure. | |
5272 | * | |
5273 | * On success return 0 else a negative value returned by the ustctl call. | |
5274 | */ | |
5275 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
5276 | { | |
5277 | int ret; | |
5278 | uint32_t pid, ppid, uid, gid; | |
5279 | ||
5280 | assert(msg); | |
5281 | ||
5282 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
5283 | &pid, &ppid, &uid, &gid, | |
5284 | &msg->bits_per_long, | |
5285 | &msg->uint8_t_alignment, | |
5286 | &msg->uint16_t_alignment, | |
5287 | &msg->uint32_t_alignment, | |
5288 | &msg->uint64_t_alignment, | |
5289 | &msg->long_alignment, | |
5290 | &msg->byte_order, | |
5291 | msg->name); | |
5292 | if (ret < 0) { | |
5293 | switch (-ret) { | |
5294 | case EPIPE: | |
5295 | case ECONNRESET: | |
5296 | case LTTNG_UST_ERR_EXITING: | |
5297 | DBG3("UST app recv reg message failed. Application died"); | |
5298 | break; | |
5299 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
5300 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
5301 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
5302 | LTTNG_UST_ABI_MINOR_VERSION); | |
5303 | break; | |
5304 | default: | |
5305 | ERR("UST app recv reg message failed with ret %d", ret); | |
5306 | break; | |
5307 | } | |
5308 | goto error; | |
5309 | } | |
5310 | msg->pid = (pid_t) pid; | |
5311 | msg->ppid = (pid_t) ppid; | |
5312 | msg->uid = (uid_t) uid; | |
5313 | msg->gid = (gid_t) gid; | |
5314 | ||
5315 | error: | |
5316 | return ret; | |
5317 | } | |
5318 | ||
10b56aef MD |
5319 | /* |
5320 | * Return a ust app session object using the application object and the | |
5321 | * session object descriptor has a key. If not found, NULL is returned. | |
5322 | * A RCU read side lock MUST be acquired when calling this function. | |
5323 | */ | |
5324 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
5325 | int objd) | |
5326 | { | |
5327 | struct lttng_ht_node_ulong *node; | |
5328 | struct lttng_ht_iter iter; | |
5329 | struct ust_app_session *ua_sess = NULL; | |
5330 | ||
5331 | assert(app); | |
5332 | ||
5333 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
5334 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5335 | if (node == NULL) { | |
5336 | DBG2("UST app session find by objd %d not found", objd); | |
5337 | goto error; | |
5338 | } | |
5339 | ||
5340 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
5341 | ||
5342 | error: | |
5343 | return ua_sess; | |
5344 | } | |
5345 | ||
d88aee68 DG |
5346 | /* |
5347 | * Return a ust app channel object using the application object and the channel | |
5348 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
5349 | * lock MUST be acquired before calling this function. | |
5350 | */ | |
d0b96690 DG |
5351 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
5352 | int objd) | |
5353 | { | |
5354 | struct lttng_ht_node_ulong *node; | |
5355 | struct lttng_ht_iter iter; | |
5356 | struct ust_app_channel *ua_chan = NULL; | |
5357 | ||
5358 | assert(app); | |
5359 | ||
5360 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
5361 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5362 | if (node == NULL) { | |
5363 | DBG2("UST app channel find by objd %d not found", objd); | |
5364 | goto error; | |
5365 | } | |
5366 | ||
5367 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
5368 | ||
5369 | error: | |
5370 | return ua_chan; | |
5371 | } | |
5372 | ||
d88aee68 DG |
5373 | /* |
5374 | * Reply to a register channel notification from an application on the notify | |
5375 | * socket. The channel metadata is also created. | |
5376 | * | |
5377 | * The session UST registry lock is acquired in this function. | |
5378 | * | |
5379 | * On success 0 is returned else a negative value. | |
5380 | */ | |
8eede835 | 5381 | static int reply_ust_register_channel(int sock, int cobjd, |
d0b96690 DG |
5382 | size_t nr_fields, struct ustctl_field *fields) |
5383 | { | |
5384 | int ret, ret_code = 0; | |
294e218e | 5385 | uint32_t chan_id; |
7972aab2 | 5386 | uint64_t chan_reg_key; |
d0b96690 DG |
5387 | enum ustctl_channel_header type; |
5388 | struct ust_app *app; | |
5389 | struct ust_app_channel *ua_chan; | |
5390 | struct ust_app_session *ua_sess; | |
7972aab2 | 5391 | struct ust_registry_session *registry; |
45893984 | 5392 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
5393 | |
5394 | rcu_read_lock(); | |
5395 | ||
5396 | /* Lookup application. If not found, there is a code flow error. */ | |
5397 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5398 | if (!app) { |
fad1ed2f | 5399 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5400 | sock); |
5401 | ret = 0; | |
5402 | goto error_rcu_unlock; | |
5403 | } | |
d0b96690 | 5404 | |
4950b860 | 5405 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5406 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5407 | if (!ua_chan) { |
fad1ed2f | 5408 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
5409 | ret = 0; |
5410 | goto error_rcu_unlock; | |
5411 | } | |
5412 | ||
d0b96690 DG |
5413 | assert(ua_chan->session); |
5414 | ua_sess = ua_chan->session; | |
d0b96690 | 5415 | |
7972aab2 DG |
5416 | /* Get right session registry depending on the session buffer type. */ |
5417 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
5418 | if (!registry) { |
5419 | DBG("Application session is being torn down. Abort event notify"); | |
5420 | ret = 0; | |
5421 | goto error_rcu_unlock; | |
5422 | }; | |
45893984 | 5423 | |
7972aab2 DG |
5424 | /* Depending on the buffer type, a different channel key is used. */ |
5425 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5426 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 5427 | } else { |
7972aab2 | 5428 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
5429 | } |
5430 | ||
7972aab2 DG |
5431 | pthread_mutex_lock(®istry->lock); |
5432 | ||
5433 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
5434 | assert(chan_reg); | |
5435 | ||
5436 | if (!chan_reg->register_done) { | |
294e218e MD |
5437 | /* |
5438 | * TODO: eventually use the registry event count for | |
5439 | * this channel to better guess header type for per-pid | |
5440 | * buffers. | |
5441 | */ | |
5442 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
7972aab2 DG |
5443 | chan_reg->nr_ctx_fields = nr_fields; |
5444 | chan_reg->ctx_fields = fields; | |
fad1ed2f | 5445 | fields = NULL; |
7972aab2 | 5446 | chan_reg->header_type = type; |
d0b96690 | 5447 | } else { |
7972aab2 DG |
5448 | /* Get current already assigned values. */ |
5449 | type = chan_reg->header_type; | |
d0b96690 | 5450 | } |
7972aab2 DG |
5451 | /* Channel id is set during the object creation. */ |
5452 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
5453 | |
5454 | /* Append to metadata */ | |
7972aab2 DG |
5455 | if (!chan_reg->metadata_dumped) { |
5456 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
5457 | if (ret_code) { |
5458 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
5459 | goto reply; | |
5460 | } | |
5461 | } | |
5462 | ||
5463 | reply: | |
7972aab2 DG |
5464 | DBG3("UST app replying to register channel key %" PRIu64 |
5465 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
5466 | ret_code); | |
d0b96690 DG |
5467 | |
5468 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
5469 | if (ret < 0) { | |
5470 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5471 | ERR("UST app reply channel failed with ret %d", ret); | |
5472 | } else { | |
5473 | DBG3("UST app reply channel failed. Application died"); | |
5474 | } | |
5475 | goto error; | |
5476 | } | |
5477 | ||
7972aab2 DG |
5478 | /* This channel registry registration is completed. */ |
5479 | chan_reg->register_done = 1; | |
5480 | ||
d0b96690 | 5481 | error: |
7972aab2 | 5482 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5483 | error_rcu_unlock: |
d0b96690 | 5484 | rcu_read_unlock(); |
fad1ed2f | 5485 | free(fields); |
d0b96690 DG |
5486 | return ret; |
5487 | } | |
5488 | ||
d88aee68 DG |
5489 | /* |
5490 | * Add event to the UST channel registry. When the event is added to the | |
5491 | * registry, the metadata is also created. Once done, this replies to the | |
5492 | * application with the appropriate error code. | |
5493 | * | |
5494 | * The session UST registry lock is acquired in the function. | |
5495 | * | |
5496 | * On success 0 is returned else a negative value. | |
5497 | */ | |
d0b96690 | 5498 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
5499 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
5500 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
5501 | { |
5502 | int ret, ret_code; | |
5503 | uint32_t event_id = 0; | |
7972aab2 | 5504 | uint64_t chan_reg_key; |
d0b96690 DG |
5505 | struct ust_app *app; |
5506 | struct ust_app_channel *ua_chan; | |
5507 | struct ust_app_session *ua_sess; | |
7972aab2 | 5508 | struct ust_registry_session *registry; |
d0b96690 DG |
5509 | |
5510 | rcu_read_lock(); | |
5511 | ||
5512 | /* Lookup application. If not found, there is a code flow error. */ | |
5513 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5514 | if (!app) { |
fad1ed2f | 5515 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5516 | sock); |
5517 | ret = 0; | |
5518 | goto error_rcu_unlock; | |
5519 | } | |
d0b96690 | 5520 | |
4950b860 | 5521 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5522 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5523 | if (!ua_chan) { |
fad1ed2f | 5524 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
5525 | ret = 0; |
5526 | goto error_rcu_unlock; | |
5527 | } | |
5528 | ||
d0b96690 DG |
5529 | assert(ua_chan->session); |
5530 | ua_sess = ua_chan->session; | |
5531 | ||
7972aab2 | 5532 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
5533 | if (!registry) { |
5534 | DBG("Application session is being torn down. Abort event notify"); | |
5535 | ret = 0; | |
5536 | goto error_rcu_unlock; | |
5537 | } | |
7972aab2 DG |
5538 | |
5539 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5540 | chan_reg_key = ua_chan->tracing_channel_id; | |
5541 | } else { | |
5542 | chan_reg_key = ua_chan->key; | |
5543 | } | |
5544 | ||
5545 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 5546 | |
d5d629b5 DG |
5547 | /* |
5548 | * From this point on, this call acquires the ownership of the sig, fields | |
5549 | * and model_emf_uri meaning any free are done inside it if needed. These | |
5550 | * three variables MUST NOT be read/write after this. | |
5551 | */ | |
7972aab2 | 5552 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
5553 | sobjd, cobjd, name, sig, nr_fields, fields, |
5554 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
5555 | &event_id, app); | |
fad1ed2f JR |
5556 | sig = NULL; |
5557 | fields = NULL; | |
5558 | model_emf_uri = NULL; | |
d0b96690 DG |
5559 | |
5560 | /* | |
5561 | * The return value is returned to ustctl so in case of an error, the | |
5562 | * application can be notified. In case of an error, it's important not to | |
5563 | * return a negative error or else the application will get closed. | |
5564 | */ | |
5565 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
5566 | if (ret < 0) { | |
5567 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5568 | ERR("UST app reply event failed with ret %d", ret); | |
5569 | } else { | |
5570 | DBG3("UST app reply event failed. Application died"); | |
5571 | } | |
5572 | /* | |
5573 | * No need to wipe the create event since the application socket will | |
5574 | * get close on error hence cleaning up everything by itself. | |
5575 | */ | |
5576 | goto error; | |
5577 | } | |
5578 | ||
7972aab2 DG |
5579 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
5580 | name, event_id); | |
d88aee68 | 5581 | |
d0b96690 | 5582 | error: |
7972aab2 | 5583 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5584 | error_rcu_unlock: |
d0b96690 | 5585 | rcu_read_unlock(); |
fad1ed2f JR |
5586 | free(sig); |
5587 | free(fields); | |
5588 | free(model_emf_uri); | |
d0b96690 DG |
5589 | return ret; |
5590 | } | |
5591 | ||
10b56aef MD |
5592 | /* |
5593 | * Add enum to the UST session registry. Once done, this replies to the | |
5594 | * application with the appropriate error code. | |
5595 | * | |
5596 | * The session UST registry lock is acquired within this function. | |
5597 | * | |
5598 | * On success 0 is returned else a negative value. | |
5599 | */ | |
5600 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
5601 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
5602 | { | |
5603 | int ret = 0, ret_code; | |
5604 | struct ust_app *app; | |
5605 | struct ust_app_session *ua_sess; | |
5606 | struct ust_registry_session *registry; | |
5607 | uint64_t enum_id = -1ULL; | |
5608 | ||
5609 | rcu_read_lock(); | |
5610 | ||
5611 | /* Lookup application. If not found, there is a code flow error. */ | |
5612 | app = find_app_by_notify_sock(sock); | |
5613 | if (!app) { | |
5614 | /* Return an error since this is not an error */ | |
5615 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
5616 | sock); | |
5617 | free(entries); | |
5618 | goto error_rcu_unlock; | |
5619 | } | |
5620 | ||
5621 | /* Lookup session by UST object descriptor. */ | |
5622 | ua_sess = find_session_by_objd(app, sobjd); | |
5623 | if (!ua_sess) { | |
5624 | /* Return an error since this is not an error */ | |
fad1ed2f | 5625 | DBG("Application session is being torn down (session not found). Aborting enum registration."); |
10b56aef MD |
5626 | free(entries); |
5627 | goto error_rcu_unlock; | |
5628 | } | |
5629 | ||
5630 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
5631 | if (!registry) { |
5632 | DBG("Application session is being torn down (registry not found). Aborting enum registration."); | |
5633 | free(entries); | |
5634 | goto error_rcu_unlock; | |
5635 | } | |
10b56aef MD |
5636 | |
5637 | pthread_mutex_lock(®istry->lock); | |
5638 | ||
5639 | /* | |
5640 | * From this point on, the callee acquires the ownership of | |
5641 | * entries. The variable entries MUST NOT be read/written after | |
5642 | * call. | |
5643 | */ | |
5644 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
5645 | entries, nr_entries, &enum_id); | |
5646 | entries = NULL; | |
5647 | ||
5648 | /* | |
5649 | * The return value is returned to ustctl so in case of an error, the | |
5650 | * application can be notified. In case of an error, it's important not to | |
5651 | * return a negative error or else the application will get closed. | |
5652 | */ | |
5653 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
5654 | if (ret < 0) { | |
5655 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5656 | ERR("UST app reply enum failed with ret %d", ret); | |
5657 | } else { | |
5658 | DBG3("UST app reply enum failed. Application died"); | |
5659 | } | |
5660 | /* | |
5661 | * No need to wipe the create enum since the application socket will | |
5662 | * get close on error hence cleaning up everything by itself. | |
5663 | */ | |
5664 | goto error; | |
5665 | } | |
5666 | ||
5667 | DBG3("UST registry enum %s added successfully or already found", name); | |
5668 | ||
5669 | error: | |
5670 | pthread_mutex_unlock(®istry->lock); | |
5671 | error_rcu_unlock: | |
5672 | rcu_read_unlock(); | |
5673 | return ret; | |
5674 | } | |
5675 | ||
d88aee68 DG |
5676 | /* |
5677 | * Handle application notification through the given notify socket. | |
5678 | * | |
5679 | * Return 0 on success or else a negative value. | |
5680 | */ | |
d0b96690 DG |
5681 | int ust_app_recv_notify(int sock) |
5682 | { | |
5683 | int ret; | |
5684 | enum ustctl_notify_cmd cmd; | |
5685 | ||
5686 | DBG3("UST app receiving notify from sock %d", sock); | |
5687 | ||
5688 | ret = ustctl_recv_notify(sock, &cmd); | |
5689 | if (ret < 0) { | |
5690 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5691 | ERR("UST app recv notify failed with ret %d", ret); | |
5692 | } else { | |
5693 | DBG3("UST app recv notify failed. Application died"); | |
5694 | } | |
5695 | goto error; | |
5696 | } | |
5697 | ||
5698 | switch (cmd) { | |
5699 | case USTCTL_NOTIFY_CMD_EVENT: | |
5700 | { | |
2106efa0 | 5701 | int sobjd, cobjd, loglevel_value; |
d0b96690 DG |
5702 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; |
5703 | size_t nr_fields; | |
5704 | struct ustctl_field *fields; | |
5705 | ||
5706 | DBG2("UST app ustctl register event received"); | |
5707 | ||
2106efa0 PP |
5708 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
5709 | &loglevel_value, &sig, &nr_fields, &fields, | |
5710 | &model_emf_uri); | |
d0b96690 DG |
5711 | if (ret < 0) { |
5712 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5713 | ERR("UST app recv event failed with ret %d", ret); | |
5714 | } else { | |
5715 | DBG3("UST app recv event failed. Application died"); | |
5716 | } | |
5717 | goto error; | |
5718 | } | |
5719 | ||
d5d629b5 DG |
5720 | /* |
5721 | * Add event to the UST registry coming from the notify socket. This | |
5722 | * call will free if needed the sig, fields and model_emf_uri. This | |
5723 | * code path loses the ownsership of these variables and transfer them | |
5724 | * to the this function. | |
5725 | */ | |
d0b96690 | 5726 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 5727 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
5728 | if (ret < 0) { |
5729 | goto error; | |
5730 | } | |
5731 | ||
5732 | break; | |
5733 | } | |
5734 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
5735 | { | |
5736 | int sobjd, cobjd; | |
5737 | size_t nr_fields; | |
5738 | struct ustctl_field *fields; | |
5739 | ||
5740 | DBG2("UST app ustctl register channel received"); | |
5741 | ||
5742 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
5743 | &fields); | |
5744 | if (ret < 0) { | |
5745 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5746 | ERR("UST app recv channel failed with ret %d", ret); | |
5747 | } else { | |
5748 | DBG3("UST app recv channel failed. Application died"); | |
5749 | } | |
5750 | goto error; | |
5751 | } | |
5752 | ||
d5d629b5 DG |
5753 | /* |
5754 | * The fields ownership are transfered to this function call meaning | |
5755 | * that if needed it will be freed. After this, it's invalid to access | |
5756 | * fields or clean it up. | |
5757 | */ | |
8eede835 | 5758 | ret = reply_ust_register_channel(sock, cobjd, nr_fields, |
d0b96690 DG |
5759 | fields); |
5760 | if (ret < 0) { | |
5761 | goto error; | |
5762 | } | |
5763 | ||
5764 | break; | |
5765 | } | |
10b56aef MD |
5766 | case USTCTL_NOTIFY_CMD_ENUM: |
5767 | { | |
5768 | int sobjd; | |
5769 | char name[LTTNG_UST_SYM_NAME_LEN]; | |
5770 | size_t nr_entries; | |
5771 | struct ustctl_enum_entry *entries; | |
5772 | ||
5773 | DBG2("UST app ustctl register enum received"); | |
5774 | ||
5775 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
5776 | &entries, &nr_entries); | |
5777 | if (ret < 0) { | |
5778 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5779 | ERR("UST app recv enum failed with ret %d", ret); | |
5780 | } else { | |
5781 | DBG3("UST app recv enum failed. Application died"); | |
5782 | } | |
5783 | goto error; | |
5784 | } | |
5785 | ||
5786 | /* Callee assumes ownership of entries */ | |
5787 | ret = add_enum_ust_registry(sock, sobjd, name, | |
5788 | entries, nr_entries); | |
5789 | if (ret < 0) { | |
5790 | goto error; | |
5791 | } | |
5792 | ||
5793 | break; | |
5794 | } | |
d0b96690 DG |
5795 | default: |
5796 | /* Should NEVER happen. */ | |
5797 | assert(0); | |
5798 | } | |
5799 | ||
5800 | error: | |
5801 | return ret; | |
5802 | } | |
d88aee68 DG |
5803 | |
5804 | /* | |
5805 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
5806 | * corresponding application. On failure, the call_rcu to close the socket is | |
5807 | * executed. If an application is found, it tries to delete it from the notify | |
5808 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
5809 | * | |
5810 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
5811 | * call RCU is not done but the rest of the cleanup is. | |
5812 | */ | |
5813 | void ust_app_notify_sock_unregister(int sock) | |
5814 | { | |
5815 | int err_enomem = 0; | |
5816 | struct lttng_ht_iter iter; | |
5817 | struct ust_app *app; | |
5818 | struct ust_app_notify_sock_obj *obj; | |
5819 | ||
5820 | assert(sock >= 0); | |
5821 | ||
5822 | rcu_read_lock(); | |
5823 | ||
5824 | obj = zmalloc(sizeof(*obj)); | |
5825 | if (!obj) { | |
5826 | /* | |
5827 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5828 | * procedure but the call_rcu will not be called. In this case, we | |
5829 | * accept the fd leak rather than possibly creating an unsynchronized | |
5830 | * state between threads. | |
5831 | * | |
5832 | * TODO: The notify object should be created once the notify socket is | |
5833 | * registered and stored independantely from the ust app object. The | |
5834 | * tricky part is to synchronize the teardown of the application and | |
5835 | * this notify object. Let's keep that in mind so we can avoid this | |
5836 | * kind of shenanigans with ENOMEM in the teardown path. | |
5837 | */ | |
5838 | err_enomem = 1; | |
5839 | } else { | |
5840 | obj->fd = sock; | |
5841 | } | |
5842 | ||
5843 | DBG("UST app notify socket unregister %d", sock); | |
5844 | ||
5845 | /* | |
5846 | * Lookup application by notify socket. If this fails, this means that the | |
5847 | * hash table delete has already been done by the application | |
5848 | * unregistration process so we can safely close the notify socket in a | |
5849 | * call RCU. | |
5850 | */ | |
5851 | app = find_app_by_notify_sock(sock); | |
5852 | if (!app) { | |
5853 | goto close_socket; | |
5854 | } | |
5855 | ||
5856 | iter.iter.node = &app->notify_sock_n.node; | |
5857 | ||
5858 | /* | |
5859 | * Whatever happens here either we fail or succeed, in both cases we have | |
5860 | * to close the socket after a grace period to continue to the call RCU | |
5861 | * here. If the deletion is successful, the application is not visible | |
5862 | * anymore by other threads and is it fails it means that it was already | |
5863 | * deleted from the hash table so either way we just have to close the | |
5864 | * socket. | |
5865 | */ | |
5866 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5867 | ||
5868 | close_socket: | |
5869 | rcu_read_unlock(); | |
5870 | ||
5871 | /* | |
5872 | * Close socket after a grace period to avoid for the socket to be reused | |
5873 | * before the application object is freed creating potential race between | |
5874 | * threads trying to add unique in the global hash table. | |
5875 | */ | |
5876 | if (!err_enomem) { | |
5877 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5878 | } | |
5879 | } | |
f45e313d DG |
5880 | |
5881 | /* | |
5882 | * Destroy a ust app data structure and free its memory. | |
5883 | */ | |
5884 | void ust_app_destroy(struct ust_app *app) | |
5885 | { | |
5886 | if (!app) { | |
5887 | return; | |
5888 | } | |
5889 | ||
5890 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5891 | } | |
6dc3064a DG |
5892 | |
5893 | /* | |
5894 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5895 | * output. | |
5896 | * | |
9a654598 | 5897 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 5898 | */ |
fb9a95c4 JG |
5899 | enum lttng_error_code ust_app_snapshot_record( |
5900 | const struct ltt_ust_session *usess, | |
348a81dc | 5901 | const struct consumer_output *output, int wait, |
d07ceecd | 5902 | uint64_t nb_packets_per_stream) |
6dc3064a DG |
5903 | { |
5904 | int ret = 0; | |
9a654598 | 5905 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
5906 | struct lttng_ht_iter iter; |
5907 | struct ust_app *app; | |
affce97e | 5908 | char *trace_path = NULL; |
6dc3064a DG |
5909 | |
5910 | assert(usess); | |
5911 | assert(output); | |
5912 | ||
5913 | rcu_read_lock(); | |
5914 | ||
8c924c7b MD |
5915 | switch (usess->buffer_type) { |
5916 | case LTTNG_BUFFER_PER_UID: | |
5917 | { | |
5918 | struct buffer_reg_uid *reg; | |
6dc3064a | 5919 | |
8c924c7b MD |
5920 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5921 | struct buffer_reg_channel *reg_chan; | |
5922 | struct consumer_socket *socket; | |
3b967712 | 5923 | char pathname[PATH_MAX]; |
6dc3064a | 5924 | |
2b269489 JR |
5925 | if (!reg->registry->reg.ust->metadata_key) { |
5926 | /* Skip since no metadata is present */ | |
5927 | continue; | |
5928 | } | |
5929 | ||
8c924c7b MD |
5930 | /* Get consumer socket to use to push the metadata.*/ |
5931 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5932 | usess->consumer); | |
5933 | if (!socket) { | |
9a654598 | 5934 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
5935 | goto error; |
5936 | } | |
6dc3064a | 5937 | |
8c924c7b | 5938 | memset(pathname, 0, sizeof(pathname)); |
d2956687 JG |
5939 | /* |
5940 | * DEFAULT_UST_TRACE_UID_PATH already contains a path | |
5941 | * separator. | |
5942 | */ | |
8c924c7b | 5943 | ret = snprintf(pathname, sizeof(pathname), |
d2956687 | 5944 | DEFAULT_UST_TRACE_DIR DEFAULT_UST_TRACE_UID_PATH, |
8c924c7b MD |
5945 | reg->uid, reg->bits_per_long); |
5946 | if (ret < 0) { | |
5947 | PERROR("snprintf snapshot path"); | |
9a654598 | 5948 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
5949 | goto error; |
5950 | } | |
affce97e JG |
5951 | /* Free path allowed on previous iteration. */ |
5952 | free(trace_path); | |
3b967712 MD |
5953 | trace_path = setup_channel_trace_path(usess->consumer, pathname); |
5954 | if (!trace_path) { | |
5955 | status = LTTNG_ERR_INVALID; | |
5956 | goto error; | |
5957 | } | |
d2956687 | 5958 | /* Add the UST default trace dir to path. */ |
8c924c7b MD |
5959 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5960 | reg_chan, node.node) { | |
9a654598 | 5961 | status = consumer_snapshot_channel(socket, |
e098433c JG |
5962 | reg_chan->consumer_key, |
5963 | output, 0, usess->uid, | |
3b967712 | 5964 | usess->gid, trace_path, wait, |
d2956687 | 5965 | nb_packets_per_stream); |
9a654598 | 5966 | if (status != LTTNG_OK) { |
8c924c7b MD |
5967 | goto error; |
5968 | } | |
5969 | } | |
9a654598 | 5970 | status = consumer_snapshot_channel(socket, |
68808f4e | 5971 | reg->registry->reg.ust->metadata_key, output, 1, |
3b967712 | 5972 | usess->uid, usess->gid, trace_path, wait, 0); |
9a654598 | 5973 | if (status != LTTNG_OK) { |
8c924c7b MD |
5974 | goto error; |
5975 | } | |
af706bb7 | 5976 | } |
8c924c7b MD |
5977 | break; |
5978 | } | |
5979 | case LTTNG_BUFFER_PER_PID: | |
5980 | { | |
5981 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5982 | struct consumer_socket *socket; | |
5983 | struct lttng_ht_iter chan_iter; | |
5984 | struct ust_app_channel *ua_chan; | |
5985 | struct ust_app_session *ua_sess; | |
5986 | struct ust_registry_session *registry; | |
3b967712 | 5987 | char pathname[PATH_MAX]; |
8c924c7b MD |
5988 | |
5989 | ua_sess = lookup_session_by_app(usess, app); | |
5990 | if (!ua_sess) { | |
5991 | /* Session not associated with this app. */ | |
5992 | continue; | |
5993 | } | |
af706bb7 | 5994 | |
8c924c7b MD |
5995 | /* Get the right consumer socket for the application. */ |
5996 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
348a81dc | 5997 | output); |
8c924c7b | 5998 | if (!socket) { |
9a654598 | 5999 | status = LTTNG_ERR_INVALID; |
5c786ded JD |
6000 | goto error; |
6001 | } | |
6002 | ||
8c924c7b MD |
6003 | /* Add the UST default trace dir to path. */ |
6004 | memset(pathname, 0, sizeof(pathname)); | |
d2956687 | 6005 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "%s", |
8c924c7b | 6006 | ua_sess->path); |
6dc3064a | 6007 | if (ret < 0) { |
9a654598 | 6008 | status = LTTNG_ERR_INVALID; |
8c924c7b | 6009 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
6010 | goto error; |
6011 | } | |
affce97e JG |
6012 | /* Free path allowed on previous iteration. */ |
6013 | free(trace_path); | |
3b967712 MD |
6014 | trace_path = setup_channel_trace_path(usess->consumer, pathname); |
6015 | if (!trace_path) { | |
6016 | status = LTTNG_ERR_INVALID; | |
6017 | goto error; | |
6018 | } | |
d2956687 | 6019 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
8c924c7b | 6020 | ua_chan, node.node) { |
9a654598 | 6021 | status = consumer_snapshot_channel(socket, |
470cc211 JG |
6022 | ua_chan->key, output, 0, |
6023 | ua_sess->effective_credentials | |
6024 | .uid, | |
6025 | ua_sess->effective_credentials | |
6026 | .gid, | |
3b967712 | 6027 | trace_path, wait, |
d2956687 | 6028 | nb_packets_per_stream); |
9a654598 JG |
6029 | switch (status) { |
6030 | case LTTNG_OK: | |
6031 | break; | |
6032 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6033 | continue; | |
6034 | default: | |
8c924c7b MD |
6035 | goto error; |
6036 | } | |
6037 | } | |
6038 | ||
6039 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 6040 | if (!registry) { |
9bbfb88c MD |
6041 | DBG("Application session is being torn down. Skip application."); |
6042 | continue; | |
fad1ed2f | 6043 | } |
9a654598 | 6044 | status = consumer_snapshot_channel(socket, |
470cc211 JG |
6045 | registry->metadata_key, output, 1, |
6046 | ua_sess->effective_credentials.uid, | |
6047 | ua_sess->effective_credentials.gid, | |
3b967712 | 6048 | trace_path, wait, 0); |
9a654598 JG |
6049 | switch (status) { |
6050 | case LTTNG_OK: | |
6051 | break; | |
6052 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6053 | continue; | |
6054 | default: | |
8c924c7b MD |
6055 | goto error; |
6056 | } | |
6057 | } | |
6058 | break; | |
6059 | } | |
6060 | default: | |
6061 | assert(0); | |
6062 | break; | |
6dc3064a DG |
6063 | } |
6064 | ||
6065 | error: | |
affce97e | 6066 | free(trace_path); |
6dc3064a | 6067 | rcu_read_unlock(); |
9a654598 | 6068 | return status; |
6dc3064a | 6069 | } |
5c786ded JD |
6070 | |
6071 | /* | |
d07ceecd | 6072 | * Return the size taken by one more packet per stream. |
5c786ded | 6073 | */ |
fb9a95c4 JG |
6074 | uint64_t ust_app_get_size_one_more_packet_per_stream( |
6075 | const struct ltt_ust_session *usess, uint64_t cur_nr_packets) | |
5c786ded | 6076 | { |
d07ceecd | 6077 | uint64_t tot_size = 0; |
5c786ded JD |
6078 | struct ust_app *app; |
6079 | struct lttng_ht_iter iter; | |
6080 | ||
6081 | assert(usess); | |
6082 | ||
6083 | switch (usess->buffer_type) { | |
6084 | case LTTNG_BUFFER_PER_UID: | |
6085 | { | |
6086 | struct buffer_reg_uid *reg; | |
6087 | ||
6088 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6089 | struct buffer_reg_channel *reg_chan; | |
6090 | ||
b7064eaa | 6091 | rcu_read_lock(); |
5c786ded JD |
6092 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6093 | reg_chan, node.node) { | |
d07ceecd MD |
6094 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
6095 | /* | |
6096 | * Don't take channel into account if we | |
6097 | * already grab all its packets. | |
6098 | */ | |
6099 | continue; | |
6100 | } | |
6101 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 6102 | } |
b7064eaa | 6103 | rcu_read_unlock(); |
5c786ded JD |
6104 | } |
6105 | break; | |
6106 | } | |
6107 | case LTTNG_BUFFER_PER_PID: | |
6108 | { | |
6109 | rcu_read_lock(); | |
6110 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6111 | struct ust_app_channel *ua_chan; | |
6112 | struct ust_app_session *ua_sess; | |
6113 | struct lttng_ht_iter chan_iter; | |
6114 | ||
6115 | ua_sess = lookup_session_by_app(usess, app); | |
6116 | if (!ua_sess) { | |
6117 | /* Session not associated with this app. */ | |
6118 | continue; | |
6119 | } | |
6120 | ||
6121 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6122 | ua_chan, node.node) { | |
d07ceecd MD |
6123 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
6124 | /* | |
6125 | * Don't take channel into account if we | |
6126 | * already grab all its packets. | |
6127 | */ | |
6128 | continue; | |
6129 | } | |
6130 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
6131 | } |
6132 | } | |
6133 | rcu_read_unlock(); | |
6134 | break; | |
6135 | } | |
6136 | default: | |
6137 | assert(0); | |
6138 | break; | |
6139 | } | |
6140 | ||
d07ceecd | 6141 | return tot_size; |
5c786ded | 6142 | } |
fb83fe64 JD |
6143 | |
6144 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
6145 | struct cds_list_head *buffer_reg_uid_list, | |
6146 | struct consumer_output *consumer, uint64_t uchan_id, | |
6147 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
6148 | { | |
6149 | int ret; | |
6150 | uint64_t consumer_chan_key; | |
6151 | ||
70dd8162 MD |
6152 | *discarded = 0; |
6153 | *lost = 0; | |
6154 | ||
fb83fe64 | 6155 | ret = buffer_reg_uid_consumer_channel_key( |
76604852 | 6156 | buffer_reg_uid_list, uchan_id, &consumer_chan_key); |
fb83fe64 | 6157 | if (ret < 0) { |
70dd8162 MD |
6158 | /* Not found */ |
6159 | ret = 0; | |
fb83fe64 JD |
6160 | goto end; |
6161 | } | |
6162 | ||
6163 | if (overwrite) { | |
6164 | ret = consumer_get_lost_packets(ust_session_id, | |
6165 | consumer_chan_key, consumer, lost); | |
6166 | } else { | |
6167 | ret = consumer_get_discarded_events(ust_session_id, | |
6168 | consumer_chan_key, consumer, discarded); | |
6169 | } | |
6170 | ||
6171 | end: | |
6172 | return ret; | |
6173 | } | |
6174 | ||
6175 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
6176 | struct ltt_ust_channel *uchan, | |
6177 | struct consumer_output *consumer, int overwrite, | |
6178 | uint64_t *discarded, uint64_t *lost) | |
6179 | { | |
6180 | int ret = 0; | |
6181 | struct lttng_ht_iter iter; | |
6182 | struct lttng_ht_node_str *ua_chan_node; | |
6183 | struct ust_app *app; | |
6184 | struct ust_app_session *ua_sess; | |
6185 | struct ust_app_channel *ua_chan; | |
6186 | ||
70dd8162 MD |
6187 | *discarded = 0; |
6188 | *lost = 0; | |
6189 | ||
fb83fe64 JD |
6190 | rcu_read_lock(); |
6191 | /* | |
70dd8162 MD |
6192 | * Iterate over every registered applications. Sum counters for |
6193 | * all applications containing requested session and channel. | |
fb83fe64 JD |
6194 | */ |
6195 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6196 | struct lttng_ht_iter uiter; | |
6197 | ||
6198 | ua_sess = lookup_session_by_app(usess, app); | |
6199 | if (ua_sess == NULL) { | |
6200 | continue; | |
6201 | } | |
6202 | ||
6203 | /* Get channel */ | |
ee022399 | 6204 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
6205 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
6206 | /* If the session is found for the app, the channel must be there */ | |
6207 | assert(ua_chan_node); | |
6208 | ||
6209 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
6210 | ||
6211 | if (overwrite) { | |
70dd8162 MD |
6212 | uint64_t _lost; |
6213 | ||
fb83fe64 | 6214 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, |
70dd8162 MD |
6215 | consumer, &_lost); |
6216 | if (ret < 0) { | |
6217 | break; | |
6218 | } | |
6219 | (*lost) += _lost; | |
fb83fe64 | 6220 | } else { |
70dd8162 MD |
6221 | uint64_t _discarded; |
6222 | ||
fb83fe64 | 6223 | ret = consumer_get_discarded_events(usess->id, |
70dd8162 MD |
6224 | ua_chan->key, consumer, &_discarded); |
6225 | if (ret < 0) { | |
6226 | break; | |
6227 | } | |
6228 | (*discarded) += _discarded; | |
fb83fe64 | 6229 | } |
fb83fe64 JD |
6230 | } |
6231 | ||
fb83fe64 JD |
6232 | rcu_read_unlock(); |
6233 | return ret; | |
6234 | } | |
c2561365 JD |
6235 | |
6236 | static | |
6237 | int ust_app_regenerate_statedump(struct ltt_ust_session *usess, | |
6238 | struct ust_app *app) | |
6239 | { | |
6240 | int ret = 0; | |
6241 | struct ust_app_session *ua_sess; | |
6242 | ||
6243 | DBG("Regenerating the metadata for ust app pid %d", app->pid); | |
6244 | ||
6245 | rcu_read_lock(); | |
6246 | ||
6247 | ua_sess = lookup_session_by_app(usess, app); | |
6248 | if (ua_sess == NULL) { | |
6249 | /* The session is in teardown process. Ignore and continue. */ | |
6250 | goto end; | |
6251 | } | |
6252 | ||
6253 | pthread_mutex_lock(&ua_sess->lock); | |
6254 | ||
6255 | if (ua_sess->deleted) { | |
6256 | goto end_unlock; | |
6257 | } | |
6258 | ||
6259 | pthread_mutex_lock(&app->sock_lock); | |
6260 | ret = ustctl_regenerate_statedump(app->sock, ua_sess->handle); | |
6261 | pthread_mutex_unlock(&app->sock_lock); | |
6262 | ||
6263 | end_unlock: | |
6264 | pthread_mutex_unlock(&ua_sess->lock); | |
6265 | ||
6266 | end: | |
6267 | rcu_read_unlock(); | |
6268 | health_code_update(); | |
6269 | return ret; | |
6270 | } | |
6271 | ||
6272 | /* | |
6273 | * Regenerate the statedump for each app in the session. | |
6274 | */ | |
6275 | int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess) | |
6276 | { | |
6277 | int ret = 0; | |
6278 | struct lttng_ht_iter iter; | |
6279 | struct ust_app *app; | |
6280 | ||
6281 | DBG("Regenerating the metadata for all UST apps"); | |
6282 | ||
6283 | rcu_read_lock(); | |
6284 | ||
6285 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6286 | if (!app->compatible) { | |
6287 | continue; | |
6288 | } | |
6289 | ||
6290 | ret = ust_app_regenerate_statedump(usess, app); | |
6291 | if (ret < 0) { | |
6292 | /* Continue to the next app even on error */ | |
6293 | continue; | |
6294 | } | |
6295 | } | |
6296 | ||
6297 | rcu_read_unlock(); | |
6298 | ||
6299 | return 0; | |
6300 | } | |
5c408ad8 JD |
6301 | |
6302 | /* | |
6303 | * Rotate all the channels of a session. | |
6304 | * | |
6f6d3b69 | 6305 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 6306 | */ |
6f6d3b69 | 6307 | enum lttng_error_code ust_app_rotate_session(struct ltt_session *session) |
5c408ad8 | 6308 | { |
6f6d3b69 MD |
6309 | int ret; |
6310 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
5c408ad8 JD |
6311 | struct lttng_ht_iter iter; |
6312 | struct ust_app *app; | |
6313 | struct ltt_ust_session *usess = session->ust_session; | |
5c408ad8 JD |
6314 | |
6315 | assert(usess); | |
6316 | ||
6317 | rcu_read_lock(); | |
6318 | ||
6319 | switch (usess->buffer_type) { | |
6320 | case LTTNG_BUFFER_PER_UID: | |
6321 | { | |
6322 | struct buffer_reg_uid *reg; | |
6323 | ||
6324 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6325 | struct buffer_reg_channel *reg_chan; | |
6326 | struct consumer_socket *socket; | |
6327 | ||
6328 | /* Get consumer socket to use to push the metadata.*/ | |
6329 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
6330 | usess->consumer); | |
6331 | if (!socket) { | |
6f6d3b69 | 6332 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
6333 | goto error; |
6334 | } | |
6335 | ||
5c408ad8 JD |
6336 | /* Rotate the data channels. */ |
6337 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
6338 | reg_chan, node.node) { | |
5c408ad8 JD |
6339 | ret = consumer_rotate_channel(socket, |
6340 | reg_chan->consumer_key, | |
6341 | usess->uid, usess->gid, | |
d2956687 JG |
6342 | usess->consumer, |
6343 | /* is_metadata_channel */ false); | |
5c408ad8 | 6344 | if (ret < 0) { |
6f6d3b69 | 6345 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
6346 | goto error; |
6347 | } | |
6348 | } | |
6349 | ||
6350 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
6351 | ||
6352 | ret = consumer_rotate_channel(socket, | |
6353 | reg->registry->reg.ust->metadata_key, | |
6354 | usess->uid, usess->gid, | |
d2956687 JG |
6355 | usess->consumer, |
6356 | /* is_metadata_channel */ true); | |
5c408ad8 | 6357 | if (ret < 0) { |
6f6d3b69 | 6358 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
6359 | goto error; |
6360 | } | |
5c408ad8 JD |
6361 | } |
6362 | break; | |
6363 | } | |
6364 | case LTTNG_BUFFER_PER_PID: | |
6365 | { | |
6366 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6367 | struct consumer_socket *socket; | |
6368 | struct lttng_ht_iter chan_iter; | |
6369 | struct ust_app_channel *ua_chan; | |
6370 | struct ust_app_session *ua_sess; | |
6371 | struct ust_registry_session *registry; | |
6372 | ||
6373 | ua_sess = lookup_session_by_app(usess, app); | |
6374 | if (!ua_sess) { | |
6375 | /* Session not associated with this app. */ | |
6376 | continue; | |
6377 | } | |
5c408ad8 JD |
6378 | |
6379 | /* Get the right consumer socket for the application. */ | |
6380 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
6381 | usess->consumer); | |
6382 | if (!socket) { | |
6f6d3b69 | 6383 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
6384 | goto error; |
6385 | } | |
6386 | ||
6387 | registry = get_session_registry(ua_sess); | |
6388 | if (!registry) { | |
6f6d3b69 MD |
6389 | DBG("Application session is being torn down. Skip application."); |
6390 | continue; | |
5c408ad8 JD |
6391 | } |
6392 | ||
5c408ad8 JD |
6393 | /* Rotate the data channels. */ |
6394 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6395 | ua_chan, node.node) { | |
470cc211 JG |
6396 | ret = consumer_rotate_channel(socket, |
6397 | ua_chan->key, | |
6398 | ua_sess->effective_credentials | |
6399 | .uid, | |
6400 | ua_sess->effective_credentials | |
6401 | .gid, | |
d2956687 JG |
6402 | ua_sess->consumer, |
6403 | /* is_metadata_channel */ false); | |
5c408ad8 | 6404 | if (ret < 0) { |
6f6d3b69 MD |
6405 | /* Per-PID buffer and application going away. */ |
6406 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
6407 | continue; | |
6408 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
6409 | goto error; |
6410 | } | |
6411 | } | |
6412 | ||
6413 | /* Rotate the metadata channel. */ | |
6414 | (void) push_metadata(registry, usess->consumer); | |
470cc211 JG |
6415 | ret = consumer_rotate_channel(socket, |
6416 | registry->metadata_key, | |
6417 | ua_sess->effective_credentials.uid, | |
6418 | ua_sess->effective_credentials.gid, | |
d2956687 JG |
6419 | ua_sess->consumer, |
6420 | /* is_metadata_channel */ true); | |
5c408ad8 | 6421 | if (ret < 0) { |
6f6d3b69 MD |
6422 | /* Per-PID buffer and application going away. */ |
6423 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
6424 | continue; | |
6425 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
6426 | goto error; |
6427 | } | |
5c408ad8 JD |
6428 | } |
6429 | break; | |
6430 | } | |
6431 | default: | |
6432 | assert(0); | |
6433 | break; | |
6434 | } | |
6435 | ||
6f6d3b69 | 6436 | cmd_ret = LTTNG_OK; |
5c408ad8 JD |
6437 | |
6438 | error: | |
6439 | rcu_read_unlock(); | |
6f6d3b69 | 6440 | return cmd_ret; |
5c408ad8 | 6441 | } |
d2956687 JG |
6442 | |
6443 | enum lttng_error_code ust_app_create_channel_subdirectories( | |
6444 | const struct ltt_ust_session *usess) | |
6445 | { | |
6446 | enum lttng_error_code ret = LTTNG_OK; | |
6447 | struct lttng_ht_iter iter; | |
6448 | enum lttng_trace_chunk_status chunk_status; | |
6449 | char *pathname_index; | |
6450 | int fmt_ret; | |
6451 | ||
6452 | assert(usess->current_trace_chunk); | |
6453 | rcu_read_lock(); | |
6454 | ||
6455 | switch (usess->buffer_type) { | |
6456 | case LTTNG_BUFFER_PER_UID: | |
6457 | { | |
6458 | struct buffer_reg_uid *reg; | |
6459 | ||
6460 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6461 | fmt_ret = asprintf(&pathname_index, | |
6462 | DEFAULT_UST_TRACE_DIR DEFAULT_UST_TRACE_UID_PATH "/" DEFAULT_INDEX_DIR, | |
6463 | reg->uid, reg->bits_per_long); | |
6464 | if (fmt_ret < 0) { | |
6465 | ERR("Failed to format channel index directory"); | |
6466 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6467 | goto error; | |
6468 | } | |
6469 | ||
6470 | /* | |
6471 | * Create the index subdirectory which will take care | |
6472 | * of implicitly creating the channel's path. | |
6473 | */ | |
6474 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
6475 | usess->current_trace_chunk, | |
6476 | pathname_index); | |
6477 | free(pathname_index); | |
6478 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
6479 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6480 | goto error; | |
6481 | } | |
6482 | } | |
6483 | break; | |
6484 | } | |
6485 | case LTTNG_BUFFER_PER_PID: | |
6486 | { | |
6487 | struct ust_app *app; | |
6488 | ||
6489 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
6490 | pid_n.node) { | |
6491 | struct ust_app_session *ua_sess; | |
6492 | struct ust_registry_session *registry; | |
6493 | ||
6494 | ua_sess = lookup_session_by_app(usess, app); | |
6495 | if (!ua_sess) { | |
6496 | /* Session not associated with this app. */ | |
6497 | continue; | |
6498 | } | |
6499 | ||
6500 | registry = get_session_registry(ua_sess); | |
6501 | if (!registry) { | |
6502 | DBG("Application session is being torn down. Skip application."); | |
6503 | continue; | |
6504 | } | |
6505 | ||
6506 | fmt_ret = asprintf(&pathname_index, | |
6507 | DEFAULT_UST_TRACE_DIR "%s/" DEFAULT_INDEX_DIR, | |
6508 | ua_sess->path); | |
6509 | if (fmt_ret < 0) { | |
6510 | ERR("Failed to format channel index directory"); | |
6511 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6512 | goto error; | |
6513 | } | |
6514 | /* | |
6515 | * Create the index subdirectory which will take care | |
6516 | * of implicitly creating the channel's path. | |
6517 | */ | |
6518 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
6519 | usess->current_trace_chunk, | |
6520 | pathname_index); | |
6521 | free(pathname_index); | |
6522 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
6523 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6524 | goto error; | |
6525 | } | |
6526 | } | |
6527 | break; | |
6528 | } | |
6529 | default: | |
6530 | abort(); | |
6531 | } | |
6532 | ||
6533 | ret = LTTNG_OK; | |
6534 | error: | |
6535 | rcu_read_unlock(); | |
6536 | return ret; | |
6537 | } |