Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
91d76f53 DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
16 | */ |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <errno.h> | |
7972aab2 | 20 | #include <inttypes.h> |
91d76f53 DG |
21 | #include <pthread.h> |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
099e26bd | 24 | #include <string.h> |
aba8e916 DG |
25 | #include <sys/stat.h> |
26 | #include <sys/types.h> | |
099e26bd | 27 | #include <unistd.h> |
0df502fd | 28 | #include <urcu/compiler.h> |
fb54cdbf | 29 | #include <lttng/ust-error.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" |
d80a6244 | 40 | #include "ust-ctl.h" |
0b2dc8df | 41 | #include "utils.h" |
d80a6244 | 42 | |
d9bf3ca4 MD |
43 | /* Next available channel key. Access under next_channel_key_lock. */ |
44 | static uint64_t _next_channel_key; | |
45 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
46 | ||
47 | /* Next available session ID. Access under next_session_id_lock. */ | |
48 | static uint64_t _next_session_id; | |
49 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
50 | |
51 | /* | |
d9bf3ca4 | 52 | * Return the incremented value of next_channel_key. |
ffe60014 | 53 | */ |
d9bf3ca4 | 54 | static uint64_t get_next_channel_key(void) |
ffe60014 | 55 | { |
d9bf3ca4 MD |
56 | uint64_t ret; |
57 | ||
58 | pthread_mutex_lock(&next_channel_key_lock); | |
59 | ret = ++_next_channel_key; | |
60 | pthread_mutex_unlock(&next_channel_key_lock); | |
61 | return ret; | |
ffe60014 DG |
62 | } |
63 | ||
64 | /* | |
7972aab2 | 65 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 66 | */ |
d9bf3ca4 | 67 | static uint64_t get_next_session_id(void) |
ffe60014 | 68 | { |
d9bf3ca4 MD |
69 | uint64_t ret; |
70 | ||
71 | pthread_mutex_lock(&next_session_id_lock); | |
72 | ret = ++_next_session_id; | |
73 | pthread_mutex_unlock(&next_session_id_lock); | |
74 | return ret; | |
ffe60014 DG |
75 | } |
76 | ||
d65d2de8 DG |
77 | static void copy_channel_attr_to_ustctl( |
78 | struct ustctl_consumer_channel_attr *attr, | |
79 | struct lttng_ust_channel_attr *uattr) | |
80 | { | |
81 | /* Copy event attributes since the layout is different. */ | |
82 | attr->subbuf_size = uattr->subbuf_size; | |
83 | attr->num_subbuf = uattr->num_subbuf; | |
84 | attr->overwrite = uattr->overwrite; | |
85 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
86 | attr->read_timer_interval = uattr->read_timer_interval; | |
87 | attr->output = uattr->output; | |
88 | } | |
89 | ||
025faf73 DG |
90 | /* |
91 | * Match function for the hash table lookup. | |
92 | * | |
93 | * It matches an ust app event based on three attributes which are the event | |
94 | * name, the filter bytecode and the loglevel. | |
95 | */ | |
18eace3b DG |
96 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
97 | { | |
98 | struct ust_app_event *event; | |
99 | const struct ust_app_ht_key *key; | |
100 | ||
101 | assert(node); | |
102 | assert(_key); | |
103 | ||
104 | event = caa_container_of(node, struct ust_app_event, node.node); | |
105 | key = _key; | |
106 | ||
1af53eb5 | 107 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
108 | |
109 | /* Event name */ | |
110 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
111 | goto no_match; | |
112 | } | |
113 | ||
114 | /* Event loglevel. */ | |
115 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
116 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
117 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
118 | /* | |
119 | * Match is accepted. This is because on event creation, the | |
120 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
121 | * -1 are accepted for this loglevel type since 0 is the one set by | |
122 | * the API when receiving an enable event. | |
123 | */ | |
124 | } else { | |
125 | goto no_match; | |
126 | } | |
18eace3b DG |
127 | } |
128 | ||
129 | /* One of the filters is NULL, fail. */ | |
130 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
131 | goto no_match; | |
132 | } | |
133 | ||
025faf73 DG |
134 | if (key->filter && event->filter) { |
135 | /* Both filters exists, check length followed by the bytecode. */ | |
136 | if (event->filter->len != key->filter->len || | |
137 | memcmp(event->filter->data, key->filter->data, | |
138 | event->filter->len) != 0) { | |
139 | goto no_match; | |
140 | } | |
18eace3b DG |
141 | } |
142 | ||
1af53eb5 JI |
143 | /* One of the exclusions is NULL, fail. */ |
144 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
145 | goto no_match; | |
146 | } | |
147 | ||
148 | if (key->exclusion && event->exclusion) { | |
149 | /* Both exclusions exists, check count followed by the names. */ | |
150 | if (event->exclusion->count != key->exclusion->count || | |
151 | memcmp(event->exclusion->names, key->exclusion->names, | |
152 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
153 | goto no_match; | |
154 | } | |
155 | } | |
156 | ||
157 | ||
025faf73 | 158 | /* Match. */ |
18eace3b DG |
159 | return 1; |
160 | ||
161 | no_match: | |
162 | return 0; | |
18eace3b DG |
163 | } |
164 | ||
025faf73 DG |
165 | /* |
166 | * Unique add of an ust app event in the given ht. This uses the custom | |
167 | * ht_match_ust_app_event match function and the event name as hash. | |
168 | */ | |
d0b96690 | 169 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
170 | struct ust_app_event *event) |
171 | { | |
172 | struct cds_lfht_node *node_ptr; | |
173 | struct ust_app_ht_key key; | |
d0b96690 | 174 | struct lttng_ht *ht; |
18eace3b | 175 | |
d0b96690 DG |
176 | assert(ua_chan); |
177 | assert(ua_chan->events); | |
18eace3b DG |
178 | assert(event); |
179 | ||
d0b96690 | 180 | ht = ua_chan->events; |
18eace3b DG |
181 | key.name = event->attr.name; |
182 | key.filter = event->filter; | |
183 | key.loglevel = event->attr.loglevel; | |
91c89f23 | 184 | key.exclusion = event->exclusion; |
18eace3b DG |
185 | |
186 | node_ptr = cds_lfht_add_unique(ht->ht, | |
187 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
188 | ht_match_ust_app_event, &key, &event->node.node); | |
189 | assert(node_ptr == &event->node.node); | |
190 | } | |
191 | ||
d88aee68 DG |
192 | /* |
193 | * Close the notify socket from the given RCU head object. This MUST be called | |
194 | * through a call_rcu(). | |
195 | */ | |
196 | static void close_notify_sock_rcu(struct rcu_head *head) | |
197 | { | |
198 | int ret; | |
199 | struct ust_app_notify_sock_obj *obj = | |
200 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
201 | ||
202 | /* Must have a valid fd here. */ | |
203 | assert(obj->fd >= 0); | |
204 | ||
205 | ret = close(obj->fd); | |
206 | if (ret) { | |
207 | ERR("close notify sock %d RCU", obj->fd); | |
208 | } | |
209 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
210 | ||
211 | free(obj); | |
212 | } | |
213 | ||
7972aab2 DG |
214 | /* |
215 | * Return the session registry according to the buffer type of the given | |
216 | * session. | |
217 | * | |
218 | * A registry per UID object MUST exists before calling this function or else | |
219 | * it assert() if not found. RCU read side lock must be acquired. | |
220 | */ | |
221 | static struct ust_registry_session *get_session_registry( | |
222 | struct ust_app_session *ua_sess) | |
223 | { | |
224 | struct ust_registry_session *registry = NULL; | |
225 | ||
226 | assert(ua_sess); | |
227 | ||
228 | switch (ua_sess->buffer_type) { | |
229 | case LTTNG_BUFFER_PER_PID: | |
230 | { | |
231 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
232 | if (!reg_pid) { | |
233 | goto error; | |
234 | } | |
235 | registry = reg_pid->registry->reg.ust; | |
236 | break; | |
237 | } | |
238 | case LTTNG_BUFFER_PER_UID: | |
239 | { | |
240 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
241 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
242 | if (!reg_uid) { | |
243 | goto error; | |
244 | } | |
245 | registry = reg_uid->registry->reg.ust; | |
246 | break; | |
247 | } | |
248 | default: | |
249 | assert(0); | |
250 | }; | |
251 | ||
252 | error: | |
253 | return registry; | |
254 | } | |
255 | ||
55cc08a6 DG |
256 | /* |
257 | * Delete ust context safely. RCU read lock must be held before calling | |
258 | * this function. | |
259 | */ | |
260 | static | |
261 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
262 | { | |
ffe60014 DG |
263 | int ret; |
264 | ||
265 | assert(ua_ctx); | |
266 | ||
55cc08a6 | 267 | if (ua_ctx->obj) { |
ffe60014 | 268 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
269 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
270 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
271 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 272 | } |
55cc08a6 DG |
273 | free(ua_ctx->obj); |
274 | } | |
275 | free(ua_ctx); | |
276 | } | |
277 | ||
d80a6244 DG |
278 | /* |
279 | * Delete ust app event safely. RCU read lock must be held before calling | |
280 | * this function. | |
281 | */ | |
8b366481 DG |
282 | static |
283 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 284 | { |
ffe60014 DG |
285 | int ret; |
286 | ||
287 | assert(ua_event); | |
288 | ||
53a80697 | 289 | free(ua_event->filter); |
951f0b71 JI |
290 | if (ua_event->exclusion != NULL) |
291 | free(ua_event->exclusion); | |
edb67388 | 292 | if (ua_event->obj != NULL) { |
ffe60014 DG |
293 | ret = ustctl_release_object(sock, ua_event->obj); |
294 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
295 | ERR("UST app sock %d release event obj failed with ret %d", | |
296 | sock, ret); | |
297 | } | |
edb67388 DG |
298 | free(ua_event->obj); |
299 | } | |
d80a6244 DG |
300 | free(ua_event); |
301 | } | |
302 | ||
303 | /* | |
7972aab2 DG |
304 | * Release ust data object of the given stream. |
305 | * | |
306 | * Return 0 on success or else a negative value. | |
d80a6244 | 307 | */ |
7972aab2 | 308 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 309 | { |
7972aab2 | 310 | int ret = 0; |
ffe60014 DG |
311 | |
312 | assert(stream); | |
313 | ||
8b366481 | 314 | if (stream->obj) { |
ffe60014 DG |
315 | ret = ustctl_release_object(sock, stream->obj); |
316 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
317 | ERR("UST app sock %d release stream obj failed with ret %d", | |
318 | sock, ret); | |
319 | } | |
4063050c | 320 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
321 | free(stream->obj); |
322 | } | |
7972aab2 DG |
323 | |
324 | return ret; | |
325 | } | |
326 | ||
327 | /* | |
328 | * Delete ust app stream safely. RCU read lock must be held before calling | |
329 | * this function. | |
330 | */ | |
331 | static | |
332 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
333 | { | |
334 | assert(stream); | |
335 | ||
336 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 337 | free(stream); |
d80a6244 DG |
338 | } |
339 | ||
36b588ed MD |
340 | /* |
341 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
342 | * section and outside of call_rcu thread, so we postpone its execution |
343 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
344 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
345 | */ |
346 | static | |
347 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
348 | { | |
349 | struct ust_app_channel *ua_chan = | |
350 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
351 | ||
0b2dc8df MD |
352 | ht_cleanup_push(ua_chan->ctx); |
353 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
354 | free(ua_chan); |
355 | } | |
356 | ||
d80a6244 DG |
357 | /* |
358 | * Delete ust app channel safely. RCU read lock must be held before calling | |
359 | * this function. | |
360 | */ | |
8b366481 | 361 | static |
d0b96690 DG |
362 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
363 | struct ust_app *app) | |
d80a6244 DG |
364 | { |
365 | int ret; | |
bec39940 | 366 | struct lttng_ht_iter iter; |
d80a6244 | 367 | struct ust_app_event *ua_event; |
55cc08a6 | 368 | struct ust_app_ctx *ua_ctx; |
030a66fa | 369 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 370 | struct ust_registry_session *registry; |
d80a6244 | 371 | |
ffe60014 DG |
372 | assert(ua_chan); |
373 | ||
374 | DBG3("UST app deleting channel %s", ua_chan->name); | |
375 | ||
55cc08a6 | 376 | /* Wipe stream */ |
d80a6244 | 377 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 378 | cds_list_del(&stream->list); |
d80a6244 DG |
379 | delete_ust_app_stream(sock, stream); |
380 | } | |
381 | ||
55cc08a6 | 382 | /* Wipe context */ |
bec39940 | 383 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 384 | cds_list_del(&ua_ctx->list); |
bec39940 | 385 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 DG |
386 | assert(!ret); |
387 | delete_ust_app_ctx(sock, ua_ctx); | |
388 | } | |
d80a6244 | 389 | |
55cc08a6 | 390 | /* Wipe events */ |
bec39940 DG |
391 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
392 | node.node) { | |
393 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 394 | assert(!ret); |
d80a6244 DG |
395 | delete_ust_app_event(sock, ua_event); |
396 | } | |
edb67388 | 397 | |
c8335706 MD |
398 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
399 | /* Wipe and free registry from session registry. */ | |
400 | registry = get_session_registry(ua_chan->session); | |
401 | if (registry) { | |
402 | ust_registry_channel_del_free(registry, ua_chan->key); | |
403 | } | |
7972aab2 | 404 | } |
d0b96690 | 405 | |
edb67388 | 406 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
407 | /* Remove channel from application UST object descriptor. */ |
408 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
409 | lttng_ht_del(app->ust_objd, &iter); | |
ffe60014 DG |
410 | ret = ustctl_release_object(sock, ua_chan->obj); |
411 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
412 | ERR("UST app sock %d release channel obj failed with ret %d", | |
413 | sock, ret); | |
414 | } | |
7972aab2 | 415 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
416 | free(ua_chan->obj); |
417 | } | |
36b588ed | 418 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
419 | } |
420 | ||
331744e3 | 421 | /* |
1b532a60 DG |
422 | * Push metadata to consumer socket. |
423 | * | |
424 | * The socket lock MUST be acquired. | |
425 | * The ust app session lock MUST be acquired. | |
331744e3 JD |
426 | * |
427 | * On success, return the len of metadata pushed or else a negative value. | |
428 | */ | |
429 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
430 | struct consumer_socket *socket, int send_zero_data) | |
431 | { | |
432 | int ret; | |
433 | char *metadata_str = NULL; | |
434 | size_t len, offset; | |
435 | ssize_t ret_val; | |
436 | ||
437 | assert(registry); | |
438 | assert(socket); | |
1b532a60 DG |
439 | |
440 | /* | |
441 | * On a push metadata error either the consumer is dead or the metadata | |
442 | * channel has been destroyed because its endpoint might have died (e.g: | |
443 | * relayd). If so, the metadata closed flag is set to 1 so we deny pushing | |
444 | * metadata again which is not valid anymore on the consumer side. | |
445 | * | |
446 | * The ust app session mutex locked allows us to make this check without | |
447 | * the registry lock. | |
448 | */ | |
449 | if (registry->metadata_closed) { | |
450 | return -EPIPE; | |
451 | } | |
331744e3 JD |
452 | |
453 | pthread_mutex_lock(®istry->lock); | |
454 | ||
455 | offset = registry->metadata_len_sent; | |
456 | len = registry->metadata_len - registry->metadata_len_sent; | |
457 | if (len == 0) { | |
458 | DBG3("No metadata to push for metadata key %" PRIu64, | |
459 | registry->metadata_key); | |
460 | ret_val = len; | |
461 | if (send_zero_data) { | |
462 | DBG("No metadata to push"); | |
463 | goto push_data; | |
464 | } | |
465 | goto end; | |
466 | } | |
467 | ||
468 | /* Allocate only what we have to send. */ | |
469 | metadata_str = zmalloc(len); | |
470 | if (!metadata_str) { | |
471 | PERROR("zmalloc ust app metadata string"); | |
472 | ret_val = -ENOMEM; | |
473 | goto error; | |
474 | } | |
475 | /* Copy what we haven't send out. */ | |
476 | memcpy(metadata_str, registry->metadata + offset, len); | |
477 | registry->metadata_len_sent += len; | |
478 | ||
479 | push_data: | |
480 | pthread_mutex_unlock(®istry->lock); | |
481 | ret = consumer_push_metadata(socket, registry->metadata_key, | |
482 | metadata_str, len, offset); | |
483 | if (ret < 0) { | |
484 | ret_val = ret; | |
485 | goto error_push; | |
486 | } | |
487 | ||
488 | free(metadata_str); | |
489 | return len; | |
490 | ||
491 | end: | |
492 | error: | |
493 | pthread_mutex_unlock(®istry->lock); | |
494 | error_push: | |
495 | free(metadata_str); | |
496 | return ret_val; | |
497 | } | |
498 | ||
d88aee68 DG |
499 | /* |
500 | * For a given application and session, push metadata to consumer. The session | |
501 | * lock MUST be acquired here before calling this. | |
331744e3 JD |
502 | * Either sock or consumer is required : if sock is NULL, the default |
503 | * socket to send the metadata is retrieved from consumer, if sock | |
504 | * is not NULL we use it to send the metadata. | |
d88aee68 DG |
505 | * |
506 | * Return 0 on success else a negative error. | |
507 | */ | |
7972aab2 DG |
508 | static int push_metadata(struct ust_registry_session *registry, |
509 | struct consumer_output *consumer) | |
d88aee68 | 510 | { |
331744e3 JD |
511 | int ret_val; |
512 | ssize_t ret; | |
d88aee68 DG |
513 | struct consumer_socket *socket; |
514 | ||
7972aab2 DG |
515 | assert(registry); |
516 | assert(consumer); | |
517 | ||
518 | rcu_read_lock(); | |
d88aee68 | 519 | |
7972aab2 DG |
520 | /* |
521 | * Means that no metadata was assigned to the session. This can happens if | |
522 | * no start has been done previously. | |
523 | */ | |
524 | if (!registry->metadata_key) { | |
331744e3 | 525 | ret_val = 0; |
1b532a60 | 526 | goto end_rcu_unlock; |
d88aee68 DG |
527 | } |
528 | ||
d88aee68 | 529 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
530 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
531 | consumer); | |
d88aee68 | 532 | if (!socket) { |
331744e3 | 533 | ret_val = -1; |
d88aee68 DG |
534 | goto error_rcu_unlock; |
535 | } | |
536 | ||
537 | /* | |
538 | * TODO: Currently, we hold the socket lock around sampling of the next | |
539 | * metadata segment to ensure we send metadata over the consumer socket in | |
540 | * the correct order. This makes the registry lock nest inside the socket | |
541 | * lock. | |
542 | * | |
543 | * Please note that this is a temporary measure: we should move this lock | |
544 | * back into ust_consumer_push_metadata() when the consumer gets the | |
545 | * ability to reorder the metadata it receives. | |
546 | */ | |
547 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
548 | ret = ust_app_push_metadata(registry, socket, 0); |
549 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 550 | if (ret < 0) { |
331744e3 | 551 | ret_val = ret; |
d88aee68 DG |
552 | goto error_rcu_unlock; |
553 | } | |
554 | ||
d88aee68 | 555 | rcu_read_unlock(); |
d88aee68 DG |
556 | return 0; |
557 | ||
d88aee68 | 558 | error_rcu_unlock: |
1b532a60 DG |
559 | /* |
560 | * On error, flag the registry that the metadata is closed. We were unable | |
561 | * to push anything and this means that either the consumer is not | |
562 | * responding or the metadata cache has been destroyed on the consumer. | |
563 | */ | |
564 | registry->metadata_closed = 1; | |
565 | end_rcu_unlock: | |
d88aee68 | 566 | rcu_read_unlock(); |
331744e3 | 567 | return ret_val; |
d88aee68 DG |
568 | } |
569 | ||
570 | /* | |
571 | * Send to the consumer a close metadata command for the given session. Once | |
572 | * done, the metadata channel is deleted and the session metadata pointer is | |
573 | * nullified. The session lock MUST be acquired here unless the application is | |
574 | * in the destroy path. | |
575 | * | |
576 | * Return 0 on success else a negative value. | |
577 | */ | |
7972aab2 DG |
578 | static int close_metadata(struct ust_registry_session *registry, |
579 | struct consumer_output *consumer) | |
d88aee68 DG |
580 | { |
581 | int ret; | |
582 | struct consumer_socket *socket; | |
583 | ||
7972aab2 DG |
584 | assert(registry); |
585 | assert(consumer); | |
d88aee68 | 586 | |
7972aab2 DG |
587 | rcu_read_lock(); |
588 | ||
589 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 | 590 | ret = 0; |
1b532a60 | 591 | goto end; |
d88aee68 DG |
592 | } |
593 | ||
d88aee68 | 594 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
595 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
596 | consumer); | |
d88aee68 DG |
597 | if (!socket) { |
598 | ret = -1; | |
7972aab2 | 599 | goto error; |
d88aee68 DG |
600 | } |
601 | ||
7972aab2 | 602 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 603 | if (ret < 0) { |
7972aab2 | 604 | goto error; |
d88aee68 DG |
605 | } |
606 | ||
d88aee68 | 607 | error: |
1b532a60 DG |
608 | /* |
609 | * Metadata closed. Even on error this means that the consumer is not | |
610 | * responding or not found so either way a second close should NOT be emit | |
611 | * for this registry. | |
612 | */ | |
613 | registry->metadata_closed = 1; | |
614 | end: | |
7972aab2 | 615 | rcu_read_unlock(); |
d88aee68 DG |
616 | return ret; |
617 | } | |
618 | ||
36b588ed MD |
619 | /* |
620 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
621 | * section and outside of call_rcu thread, so we postpone its execution |
622 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
623 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
624 | */ |
625 | static | |
626 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
627 | { | |
628 | struct ust_app_session *ua_sess = | |
629 | caa_container_of(head, struct ust_app_session, rcu_head); | |
630 | ||
0b2dc8df | 631 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
632 | free(ua_sess); |
633 | } | |
634 | ||
d80a6244 DG |
635 | /* |
636 | * Delete ust app session safely. RCU read lock must be held before calling | |
637 | * this function. | |
638 | */ | |
8b366481 | 639 | static |
d0b96690 DG |
640 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
641 | struct ust_app *app) | |
d80a6244 DG |
642 | { |
643 | int ret; | |
bec39940 | 644 | struct lttng_ht_iter iter; |
d80a6244 | 645 | struct ust_app_channel *ua_chan; |
7972aab2 | 646 | struct ust_registry_session *registry; |
d80a6244 | 647 | |
d88aee68 DG |
648 | assert(ua_sess); |
649 | ||
1b532a60 DG |
650 | pthread_mutex_lock(&ua_sess->lock); |
651 | ||
7972aab2 | 652 | registry = get_session_registry(ua_sess); |
1b532a60 | 653 | if (registry && !registry->metadata_closed) { |
d88aee68 | 654 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 655 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 656 | |
7972aab2 DG |
657 | /* |
658 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
659 | * metadata only on destroy trace session in this case. Also, the |
660 | * previous push metadata could have flag the metadata registry to | |
661 | * close so don't send a close command if closed. | |
7972aab2 | 662 | */ |
1b532a60 DG |
663 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
664 | !registry->metadata_closed) { | |
7972aab2 DG |
665 | /* And ask to close it for this session registry. */ |
666 | (void) close_metadata(registry, ua_sess->consumer); | |
667 | } | |
d80a6244 DG |
668 | } |
669 | ||
bec39940 DG |
670 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
671 | node.node) { | |
672 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 673 | assert(!ret); |
d0b96690 | 674 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 675 | } |
d80a6244 | 676 | |
7972aab2 DG |
677 | /* In case of per PID, the registry is kept in the session. */ |
678 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
679 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
680 | if (reg_pid) { | |
681 | buffer_reg_pid_remove(reg_pid); | |
682 | buffer_reg_pid_destroy(reg_pid); | |
683 | } | |
684 | } | |
d0b96690 | 685 | |
aee6bafd | 686 | if (ua_sess->handle != -1) { |
ffe60014 DG |
687 | ret = ustctl_release_handle(sock, ua_sess->handle); |
688 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
689 | ERR("UST app sock %d release session handle failed with ret %d", | |
690 | sock, ret); | |
691 | } | |
aee6bafd | 692 | } |
1b532a60 DG |
693 | pthread_mutex_unlock(&ua_sess->lock); |
694 | ||
36b588ed | 695 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 696 | } |
91d76f53 DG |
697 | |
698 | /* | |
284d8f55 DG |
699 | * Delete a traceable application structure from the global list. Never call |
700 | * this function outside of a call_rcu call. | |
36b588ed MD |
701 | * |
702 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 703 | */ |
8b366481 DG |
704 | static |
705 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 706 | { |
8b366481 | 707 | int ret, sock; |
d42f20df | 708 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 709 | |
d80a6244 | 710 | /* Delete ust app sessions info */ |
852d0037 DG |
711 | sock = app->sock; |
712 | app->sock = -1; | |
d80a6244 | 713 | |
8b366481 | 714 | /* Wipe sessions */ |
d42f20df DG |
715 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
716 | teardown_node) { | |
717 | /* Free every object in the session and the session. */ | |
36b588ed | 718 | rcu_read_lock(); |
d0b96690 | 719 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 720 | rcu_read_unlock(); |
d80a6244 | 721 | } |
36b588ed | 722 | |
0b2dc8df MD |
723 | ht_cleanup_push(app->sessions); |
724 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 725 | |
6414a713 | 726 | /* |
852d0037 DG |
727 | * Wait until we have deleted the application from the sock hash table |
728 | * before closing this socket, otherwise an application could re-use the | |
729 | * socket ID and race with the teardown, using the same hash table entry. | |
730 | * | |
731 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
732 | * all RCU readers that could run concurrently with unregister app, | |
733 | * therefore we _need_ to only close that socket after a grace period. So | |
734 | * it should stay in this RCU callback. | |
735 | * | |
736 | * This close() is a very important step of the synchronization model so | |
737 | * every modification to this function must be carefully reviewed. | |
6414a713 | 738 | */ |
799e2c4f MD |
739 | ret = close(sock); |
740 | if (ret) { | |
741 | PERROR("close"); | |
742 | } | |
4063050c | 743 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 744 | |
852d0037 | 745 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 746 | free(app); |
099e26bd DG |
747 | } |
748 | ||
749 | /* | |
f6a9efaa | 750 | * URCU intermediate call to delete an UST app. |
099e26bd | 751 | */ |
8b366481 DG |
752 | static |
753 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 754 | { |
bec39940 DG |
755 | struct lttng_ht_node_ulong *node = |
756 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 757 | struct ust_app *app = |
852d0037 | 758 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 759 | |
852d0037 | 760 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 761 | delete_ust_app(app); |
099e26bd DG |
762 | } |
763 | ||
ffe60014 DG |
764 | /* |
765 | * Delete the session from the application ht and delete the data structure by | |
766 | * freeing every object inside and releasing them. | |
767 | */ | |
d0b96690 | 768 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
769 | struct ust_app_session *ua_sess) |
770 | { | |
771 | int ret; | |
772 | struct lttng_ht_iter iter; | |
773 | ||
774 | assert(app); | |
775 | assert(ua_sess); | |
776 | ||
777 | iter.iter.node = &ua_sess->node.node; | |
778 | ret = lttng_ht_del(app->sessions, &iter); | |
779 | if (ret) { | |
780 | /* Already scheduled for teardown. */ | |
781 | goto end; | |
782 | } | |
783 | ||
784 | /* Once deleted, free the data structure. */ | |
d0b96690 | 785 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
786 | |
787 | end: | |
788 | return; | |
789 | } | |
790 | ||
8b366481 DG |
791 | /* |
792 | * Alloc new UST app session. | |
793 | */ | |
794 | static | |
d0b96690 | 795 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
796 | { |
797 | struct ust_app_session *ua_sess; | |
798 | ||
799 | /* Init most of the default value by allocating and zeroing */ | |
800 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
801 | if (ua_sess == NULL) { | |
802 | PERROR("malloc"); | |
ffe60014 | 803 | goto error_free; |
8b366481 DG |
804 | } |
805 | ||
806 | ua_sess->handle = -1; | |
bec39940 | 807 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
d0b96690 | 808 | pthread_mutex_init(&ua_sess->lock, NULL); |
ffe60014 | 809 | |
8b366481 DG |
810 | return ua_sess; |
811 | ||
ffe60014 | 812 | error_free: |
8b366481 DG |
813 | return NULL; |
814 | } | |
815 | ||
816 | /* | |
817 | * Alloc new UST app channel. | |
818 | */ | |
819 | static | |
820 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 821 | struct ust_app_session *ua_sess, |
ffe60014 | 822 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
823 | { |
824 | struct ust_app_channel *ua_chan; | |
825 | ||
826 | /* Init most of the default value by allocating and zeroing */ | |
827 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
828 | if (ua_chan == NULL) { | |
829 | PERROR("malloc"); | |
830 | goto error; | |
831 | } | |
832 | ||
833 | /* Setup channel name */ | |
834 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
835 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
836 | ||
837 | ua_chan->enabled = 1; | |
838 | ua_chan->handle = -1; | |
45893984 | 839 | ua_chan->session = ua_sess; |
ffe60014 | 840 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
841 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
842 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
843 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
844 | |
845 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 846 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
847 | |
848 | /* Copy attributes */ | |
849 | if (attr) { | |
ffe60014 | 850 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
851 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
852 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
853 | ua_chan->attr.overwrite = attr->overwrite; | |
854 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
855 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
856 | ua_chan->attr.output = attr->output; | |
8b366481 | 857 | } |
ffe60014 DG |
858 | /* By default, the channel is a per cpu channel. */ |
859 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
860 | |
861 | DBG3("UST app channel %s allocated", ua_chan->name); | |
862 | ||
863 | return ua_chan; | |
864 | ||
865 | error: | |
866 | return NULL; | |
867 | } | |
868 | ||
37f1c236 DG |
869 | /* |
870 | * Allocate and initialize a UST app stream. | |
871 | * | |
872 | * Return newly allocated stream pointer or NULL on error. | |
873 | */ | |
ffe60014 | 874 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
875 | { |
876 | struct ust_app_stream *stream = NULL; | |
877 | ||
878 | stream = zmalloc(sizeof(*stream)); | |
879 | if (stream == NULL) { | |
880 | PERROR("zmalloc ust app stream"); | |
881 | goto error; | |
882 | } | |
883 | ||
884 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
885 | stream->handle = -1; | |
886 | ||
887 | error: | |
888 | return stream; | |
889 | } | |
890 | ||
8b366481 DG |
891 | /* |
892 | * Alloc new UST app event. | |
893 | */ | |
894 | static | |
895 | struct ust_app_event *alloc_ust_app_event(char *name, | |
896 | struct lttng_ust_event *attr) | |
897 | { | |
898 | struct ust_app_event *ua_event; | |
899 | ||
900 | /* Init most of the default value by allocating and zeroing */ | |
901 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
902 | if (ua_event == NULL) { | |
903 | PERROR("malloc"); | |
904 | goto error; | |
905 | } | |
906 | ||
907 | ua_event->enabled = 1; | |
908 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
909 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 910 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
911 | |
912 | /* Copy attributes */ | |
913 | if (attr) { | |
914 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
915 | } | |
916 | ||
917 | DBG3("UST app event %s allocated", ua_event->name); | |
918 | ||
919 | return ua_event; | |
920 | ||
921 | error: | |
922 | return NULL; | |
923 | } | |
924 | ||
925 | /* | |
926 | * Alloc new UST app context. | |
927 | */ | |
928 | static | |
929 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
930 | { | |
931 | struct ust_app_ctx *ua_ctx; | |
932 | ||
933 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
934 | if (ua_ctx == NULL) { | |
935 | goto error; | |
936 | } | |
937 | ||
31746f93 DG |
938 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
939 | ||
8b366481 DG |
940 | if (uctx) { |
941 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
942 | } | |
943 | ||
944 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
945 | ||
946 | error: | |
947 | return ua_ctx; | |
948 | } | |
949 | ||
025faf73 DG |
950 | /* |
951 | * Allocate a filter and copy the given original filter. | |
952 | * | |
953 | * Return allocated filter or NULL on error. | |
954 | */ | |
955 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
956 | struct lttng_ust_filter_bytecode *orig_f) | |
957 | { | |
958 | struct lttng_ust_filter_bytecode *filter = NULL; | |
959 | ||
960 | /* Copy filter bytecode */ | |
961 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
962 | if (!filter) { | |
963 | PERROR("zmalloc alloc ust app filter"); | |
964 | goto error; | |
965 | } | |
966 | ||
967 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
968 | ||
969 | error: | |
970 | return filter; | |
971 | } | |
972 | ||
099e26bd | 973 | /* |
421cb601 DG |
974 | * Find an ust_app using the sock and return it. RCU read side lock must be |
975 | * held before calling this helper function. | |
099e26bd | 976 | */ |
f20baf8e | 977 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 978 | { |
bec39940 | 979 | struct lttng_ht_node_ulong *node; |
bec39940 | 980 | struct lttng_ht_iter iter; |
f6a9efaa | 981 | |
852d0037 | 982 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 983 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
984 | if (node == NULL) { |
985 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
986 | goto error; |
987 | } | |
852d0037 DG |
988 | |
989 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
990 | |
991 | error: | |
992 | return NULL; | |
099e26bd DG |
993 | } |
994 | ||
d0b96690 DG |
995 | /* |
996 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
997 | * be held before calling this helper function. | |
998 | */ | |
999 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1000 | { | |
1001 | struct lttng_ht_node_ulong *node; | |
1002 | struct lttng_ht_iter iter; | |
1003 | ||
1004 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1005 | &iter); | |
1006 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1007 | if (node == NULL) { | |
1008 | DBG2("UST app find by notify sock %d not found", sock); | |
1009 | goto error; | |
1010 | } | |
1011 | ||
1012 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1013 | ||
1014 | error: | |
1015 | return NULL; | |
1016 | } | |
1017 | ||
025faf73 DG |
1018 | /* |
1019 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1020 | * event loglevel. | |
1021 | * | |
1022 | * Return an ust_app_event object or NULL on error. | |
1023 | */ | |
18eace3b | 1024 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
39c5a3a7 JI |
1025 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel, |
1026 | const struct lttng_event_exclusion *exclusion) | |
18eace3b DG |
1027 | { |
1028 | struct lttng_ht_iter iter; | |
1029 | struct lttng_ht_node_str *node; | |
1030 | struct ust_app_event *event = NULL; | |
1031 | struct ust_app_ht_key key; | |
18eace3b DG |
1032 | |
1033 | assert(name); | |
1034 | assert(ht); | |
1035 | ||
1036 | /* Setup key for event lookup. */ | |
1037 | key.name = name; | |
1038 | key.filter = filter; | |
1039 | key.loglevel = loglevel; | |
39c5a3a7 JI |
1040 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
1041 | key.exclusion = (struct lttng_ust_event_exclusion *)exclusion; | |
18eace3b | 1042 | |
025faf73 DG |
1043 | /* Lookup using the event name as hash and a custom match fct. */ |
1044 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1045 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1046 | node = lttng_ht_iter_get_node_str(&iter); |
1047 | if (node == NULL) { | |
1048 | goto end; | |
1049 | } | |
1050 | ||
1051 | event = caa_container_of(node, struct ust_app_event, node); | |
1052 | ||
1053 | end: | |
18eace3b DG |
1054 | return event; |
1055 | } | |
1056 | ||
55cc08a6 DG |
1057 | /* |
1058 | * Create the channel context on the tracer. | |
d0b96690 DG |
1059 | * |
1060 | * Called with UST app session lock held. | |
55cc08a6 DG |
1061 | */ |
1062 | static | |
1063 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1064 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1065 | { | |
1066 | int ret; | |
1067 | ||
840cb59c | 1068 | health_code_update(); |
86acf0da | 1069 | |
852d0037 | 1070 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1071 | ua_chan->obj, &ua_ctx->obj); |
1072 | if (ret < 0) { | |
ffe60014 DG |
1073 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1074 | ERR("UST app create channel context failed for app (pid: %d) " | |
1075 | "with ret %d", app->pid, ret); | |
1076 | } else { | |
3757b385 DG |
1077 | /* |
1078 | * This is normal behavior, an application can die during the | |
1079 | * creation process. Don't report an error so the execution can | |
1080 | * continue normally. | |
1081 | */ | |
1082 | ret = 0; | |
ffe60014 DG |
1083 | DBG3("UST app disable event failed. Application is dead."); |
1084 | } | |
55cc08a6 DG |
1085 | goto error; |
1086 | } | |
1087 | ||
1088 | ua_ctx->handle = ua_ctx->obj->handle; | |
1089 | ||
d0b96690 DG |
1090 | DBG2("UST app context handle %d created successfully for channel %s", |
1091 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1092 | |
1093 | error: | |
840cb59c | 1094 | health_code_update(); |
55cc08a6 DG |
1095 | return ret; |
1096 | } | |
1097 | ||
53a80697 MD |
1098 | /* |
1099 | * Set the filter on the tracer. | |
1100 | */ | |
1101 | static | |
1102 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1103 | struct ust_app *app) | |
1104 | { | |
1105 | int ret; | |
1106 | ||
840cb59c | 1107 | health_code_update(); |
86acf0da | 1108 | |
53a80697 | 1109 | if (!ua_event->filter) { |
86acf0da DG |
1110 | ret = 0; |
1111 | goto error; | |
53a80697 MD |
1112 | } |
1113 | ||
1114 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1115 | ua_event->obj); | |
1116 | if (ret < 0) { | |
ffe60014 DG |
1117 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1118 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1119 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1120 | } else { | |
3757b385 DG |
1121 | /* |
1122 | * This is normal behavior, an application can die during the | |
1123 | * creation process. Don't report an error so the execution can | |
1124 | * continue normally. | |
1125 | */ | |
1126 | ret = 0; | |
ffe60014 DG |
1127 | DBG3("UST app filter event failed. Application is dead."); |
1128 | } | |
53a80697 MD |
1129 | goto error; |
1130 | } | |
1131 | ||
1132 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1133 | ||
1134 | error: | |
840cb59c | 1135 | health_code_update(); |
53a80697 MD |
1136 | return ret; |
1137 | } | |
1138 | ||
7cc9a73c JI |
1139 | /* |
1140 | * Set event exclusions on the tracer. | |
1141 | */ | |
1142 | static | |
1143 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1144 | struct ust_app *app) | |
1145 | { | |
1146 | int ret; | |
1147 | ||
1148 | health_code_update(); | |
1149 | ||
1150 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1151 | ret = 0; | |
1152 | goto error; | |
1153 | } | |
1154 | ||
1155 | ret = ustctl_set_exclusion(app->sock, ua_event->exclusion, | |
1156 | ua_event->obj); | |
1157 | if (ret < 0) { | |
1158 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1159 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1160 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1161 | } else { | |
1162 | /* | |
1163 | * This is normal behavior, an application can die during the | |
1164 | * creation process. Don't report an error so the execution can | |
1165 | * continue normally. | |
1166 | */ | |
1167 | ret = 0; | |
1168 | DBG3("UST app event exclusion failed. Application is dead."); | |
1169 | } | |
1170 | goto error; | |
1171 | } | |
1172 | ||
1173 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1174 | ||
1175 | error: | |
1176 | health_code_update(); | |
1177 | return ret; | |
1178 | } | |
1179 | ||
9730260e DG |
1180 | /* |
1181 | * Disable the specified event on to UST tracer for the UST session. | |
1182 | */ | |
1183 | static int disable_ust_event(struct ust_app *app, | |
1184 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1185 | { | |
1186 | int ret; | |
1187 | ||
840cb59c | 1188 | health_code_update(); |
86acf0da | 1189 | |
852d0037 | 1190 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1191 | if (ret < 0) { |
ffe60014 DG |
1192 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1193 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1194 | "and session handle %d with ret %d", | |
1195 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1196 | } else { | |
3757b385 DG |
1197 | /* |
1198 | * This is normal behavior, an application can die during the | |
1199 | * creation process. Don't report an error so the execution can | |
1200 | * continue normally. | |
1201 | */ | |
1202 | ret = 0; | |
ffe60014 DG |
1203 | DBG3("UST app disable event failed. Application is dead."); |
1204 | } | |
9730260e DG |
1205 | goto error; |
1206 | } | |
1207 | ||
1208 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1209 | ua_event->attr.name, app->pid); |
9730260e DG |
1210 | |
1211 | error: | |
840cb59c | 1212 | health_code_update(); |
9730260e DG |
1213 | return ret; |
1214 | } | |
1215 | ||
78f0bacd DG |
1216 | /* |
1217 | * Disable the specified channel on to UST tracer for the UST session. | |
1218 | */ | |
1219 | static int disable_ust_channel(struct ust_app *app, | |
1220 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1221 | { | |
1222 | int ret; | |
1223 | ||
840cb59c | 1224 | health_code_update(); |
86acf0da | 1225 | |
852d0037 | 1226 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1227 | if (ret < 0) { |
ffe60014 DG |
1228 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1229 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1230 | "and session handle %d with ret %d", | |
1231 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1232 | } else { | |
3757b385 DG |
1233 | /* |
1234 | * This is normal behavior, an application can die during the | |
1235 | * creation process. Don't report an error so the execution can | |
1236 | * continue normally. | |
1237 | */ | |
1238 | ret = 0; | |
ffe60014 DG |
1239 | DBG3("UST app disable channel failed. Application is dead."); |
1240 | } | |
78f0bacd DG |
1241 | goto error; |
1242 | } | |
1243 | ||
78f0bacd | 1244 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1245 | ua_chan->name, app->pid); |
78f0bacd DG |
1246 | |
1247 | error: | |
840cb59c | 1248 | health_code_update(); |
78f0bacd DG |
1249 | return ret; |
1250 | } | |
1251 | ||
1252 | /* | |
1253 | * Enable the specified channel on to UST tracer for the UST session. | |
1254 | */ | |
1255 | static int enable_ust_channel(struct ust_app *app, | |
1256 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1257 | { | |
1258 | int ret; | |
1259 | ||
840cb59c | 1260 | health_code_update(); |
86acf0da | 1261 | |
852d0037 | 1262 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1263 | if (ret < 0) { |
ffe60014 DG |
1264 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1265 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1266 | "and session handle %d with ret %d", | |
1267 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1268 | } else { | |
3757b385 DG |
1269 | /* |
1270 | * This is normal behavior, an application can die during the | |
1271 | * creation process. Don't report an error so the execution can | |
1272 | * continue normally. | |
1273 | */ | |
1274 | ret = 0; | |
ffe60014 DG |
1275 | DBG3("UST app enable channel failed. Application is dead."); |
1276 | } | |
78f0bacd DG |
1277 | goto error; |
1278 | } | |
1279 | ||
1280 | ua_chan->enabled = 1; | |
1281 | ||
1282 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1283 | ua_chan->name, app->pid); |
78f0bacd DG |
1284 | |
1285 | error: | |
840cb59c | 1286 | health_code_update(); |
78f0bacd DG |
1287 | return ret; |
1288 | } | |
1289 | ||
edb67388 DG |
1290 | /* |
1291 | * Enable the specified event on to UST tracer for the UST session. | |
1292 | */ | |
1293 | static int enable_ust_event(struct ust_app *app, | |
1294 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1295 | { | |
1296 | int ret; | |
1297 | ||
840cb59c | 1298 | health_code_update(); |
86acf0da | 1299 | |
852d0037 | 1300 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1301 | if (ret < 0) { |
ffe60014 DG |
1302 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1303 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1304 | "and session handle %d with ret %d", | |
1305 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1306 | } else { | |
3757b385 DG |
1307 | /* |
1308 | * This is normal behavior, an application can die during the | |
1309 | * creation process. Don't report an error so the execution can | |
1310 | * continue normally. | |
1311 | */ | |
1312 | ret = 0; | |
ffe60014 DG |
1313 | DBG3("UST app enable event failed. Application is dead."); |
1314 | } | |
edb67388 DG |
1315 | goto error; |
1316 | } | |
1317 | ||
1318 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1319 | ua_event->attr.name, app->pid); |
edb67388 DG |
1320 | |
1321 | error: | |
840cb59c | 1322 | health_code_update(); |
edb67388 DG |
1323 | return ret; |
1324 | } | |
1325 | ||
099e26bd | 1326 | /* |
7972aab2 | 1327 | * Send channel and stream buffer to application. |
4f3ab6ee | 1328 | * |
ffe60014 | 1329 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1330 | */ |
7972aab2 DG |
1331 | static int send_channel_pid_to_ust(struct ust_app *app, |
1332 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1333 | { |
1334 | int ret; | |
ffe60014 | 1335 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1336 | |
1337 | assert(app); | |
ffe60014 | 1338 | assert(ua_sess); |
4f3ab6ee | 1339 | assert(ua_chan); |
4f3ab6ee | 1340 | |
840cb59c | 1341 | health_code_update(); |
4f3ab6ee | 1342 | |
7972aab2 DG |
1343 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1344 | app->sock); | |
86acf0da | 1345 | |
ffe60014 DG |
1346 | /* Send channel to the application. */ |
1347 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1348 | if (ret < 0) { |
b551a063 DG |
1349 | goto error; |
1350 | } | |
1351 | ||
d88aee68 DG |
1352 | health_code_update(); |
1353 | ||
ffe60014 DG |
1354 | /* Send all streams to application. */ |
1355 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1356 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1357 | if (ret < 0) { | |
1358 | goto error; | |
1359 | } | |
1360 | /* We don't need the stream anymore once sent to the tracer. */ | |
1361 | cds_list_del(&stream->list); | |
1362 | delete_ust_app_stream(-1, stream); | |
1363 | } | |
ffe60014 DG |
1364 | /* Flag the channel that it is sent to the application. */ |
1365 | ua_chan->is_sent = 1; | |
ffe60014 | 1366 | |
b551a063 | 1367 | error: |
840cb59c | 1368 | health_code_update(); |
b551a063 DG |
1369 | return ret; |
1370 | } | |
1371 | ||
91d76f53 | 1372 | /* |
5b4a0ec0 | 1373 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1374 | * |
1375 | * Should be called with session mutex held. | |
91d76f53 | 1376 | */ |
edb67388 DG |
1377 | static |
1378 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1379 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1380 | { |
5b4a0ec0 | 1381 | int ret = 0; |
284d8f55 | 1382 | |
840cb59c | 1383 | health_code_update(); |
86acf0da | 1384 | |
5b4a0ec0 | 1385 | /* Create UST event on tracer */ |
852d0037 | 1386 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1387 | &ua_event->obj); |
1388 | if (ret < 0) { | |
ffe60014 DG |
1389 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1390 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1391 | ua_event->attr.name, app->pid, ret); | |
1392 | } else { | |
3757b385 DG |
1393 | /* |
1394 | * This is normal behavior, an application can die during the | |
1395 | * creation process. Don't report an error so the execution can | |
1396 | * continue normally. | |
1397 | */ | |
1398 | ret = 0; | |
ffe60014 DG |
1399 | DBG3("UST app create event failed. Application is dead."); |
1400 | } | |
5b4a0ec0 | 1401 | goto error; |
91d76f53 | 1402 | } |
f6a9efaa | 1403 | |
5b4a0ec0 | 1404 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1405 | |
5b4a0ec0 | 1406 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1407 | ua_event->attr.name, app->pid); |
f6a9efaa | 1408 | |
840cb59c | 1409 | health_code_update(); |
86acf0da | 1410 | |
025faf73 DG |
1411 | /* Set filter if one is present. */ |
1412 | if (ua_event->filter) { | |
1413 | ret = set_ust_event_filter(ua_event, app); | |
1414 | if (ret < 0) { | |
1415 | goto error; | |
1416 | } | |
1417 | } | |
1418 | ||
7cc9a73c JI |
1419 | /* Set exclusions for the event */ |
1420 | if (ua_event->exclusion) { | |
1421 | ret = set_ust_event_exclusion(ua_event, app); | |
1422 | if (ret < 0) { | |
1423 | goto error; | |
1424 | } | |
1425 | } | |
1426 | ||
8535a6d9 | 1427 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 1428 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
1429 | ret = disable_ust_event(app, ua_sess, ua_event); |
1430 | if (ret < 0) { | |
fc34caaa DG |
1431 | /* |
1432 | * If we hit an EPERM, something is wrong with our disable call. If | |
1433 | * we get an EEXIST, there is a problem on the tracer side since we | |
1434 | * just created it. | |
1435 | */ | |
1436 | switch (ret) { | |
49c336c1 | 1437 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1438 | /* Code flow problem */ |
1439 | assert(0); | |
49c336c1 | 1440 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1441 | /* It's OK for our use case. */ |
1442 | ret = 0; | |
1443 | break; | |
1444 | default: | |
1445 | break; | |
1446 | } | |
8535a6d9 DG |
1447 | goto error; |
1448 | } | |
1449 | } | |
1450 | ||
5b4a0ec0 | 1451 | error: |
840cb59c | 1452 | health_code_update(); |
5b4a0ec0 | 1453 | return ret; |
91d76f53 | 1454 | } |
48842b30 | 1455 | |
5b4a0ec0 DG |
1456 | /* |
1457 | * Copy data between an UST app event and a LTT event. | |
1458 | */ | |
421cb601 | 1459 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1460 | struct ltt_ust_event *uevent) |
1461 | { | |
b4ffad32 JI |
1462 | size_t exclusion_alloc_size; |
1463 | ||
48842b30 DG |
1464 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1465 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1466 | ||
fc34caaa DG |
1467 | ua_event->enabled = uevent->enabled; |
1468 | ||
5b4a0ec0 DG |
1469 | /* Copy event attributes */ |
1470 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1471 | ||
53a80697 MD |
1472 | /* Copy filter bytecode */ |
1473 | if (uevent->filter) { | |
025faf73 DG |
1474 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1475 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1476 | } |
b4ffad32 JI |
1477 | |
1478 | /* Copy exclusion data */ | |
1479 | if (uevent->exclusion) { | |
1480 | exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1481 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; | |
1482 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
1483 | if (ua_event->exclusion) { | |
1484 | memcpy(ua_event->exclusion, uevent->exclusion, exclusion_alloc_size); | |
1485 | } | |
1486 | } | |
48842b30 DG |
1487 | } |
1488 | ||
5b4a0ec0 DG |
1489 | /* |
1490 | * Copy data between an UST app channel and a LTT channel. | |
1491 | */ | |
421cb601 | 1492 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1493 | struct ltt_ust_channel *uchan) |
1494 | { | |
bec39940 | 1495 | struct lttng_ht_iter iter; |
48842b30 | 1496 | struct ltt_ust_event *uevent; |
55cc08a6 | 1497 | struct ltt_ust_context *uctx; |
48842b30 | 1498 | struct ust_app_event *ua_event; |
55cc08a6 | 1499 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1500 | |
fc34caaa | 1501 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1502 | |
1503 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1504 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1505 | |
1624d5b7 JD |
1506 | ua_chan->tracefile_size = uchan->tracefile_size; |
1507 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1508 | ||
ffe60014 DG |
1509 | /* Copy event attributes since the layout is different. */ |
1510 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1511 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1512 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1513 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1514 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1515 | ua_chan->attr.output = uchan->attr.output; | |
1516 | /* | |
1517 | * Note that the attribute channel type is not set since the channel on the | |
1518 | * tracing registry side does not have this information. | |
1519 | */ | |
48842b30 | 1520 | |
fc34caaa | 1521 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1522 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1523 | |
31746f93 | 1524 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1525 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1526 | if (ua_ctx == NULL) { | |
1527 | continue; | |
1528 | } | |
bec39940 DG |
1529 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1530 | (unsigned long) ua_ctx->ctx.ctx); | |
1531 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
31746f93 | 1532 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1533 | } |
48842b30 | 1534 | |
421cb601 | 1535 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1536 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1537 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1538 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1539 | if (ua_event == NULL) { |
421cb601 | 1540 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1541 | uevent->attr.name); |
284d8f55 | 1542 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1543 | if (ua_event == NULL) { |
5b4a0ec0 | 1544 | continue; |
48842b30 | 1545 | } |
421cb601 | 1546 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1547 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1548 | } |
48842b30 DG |
1549 | } |
1550 | ||
fc34caaa | 1551 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1552 | } |
1553 | ||
5b4a0ec0 DG |
1554 | /* |
1555 | * Copy data between a UST app session and a regular LTT session. | |
1556 | */ | |
421cb601 | 1557 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1558 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1559 | { |
bec39940 DG |
1560 | struct lttng_ht_node_str *ua_chan_node; |
1561 | struct lttng_ht_iter iter; | |
48842b30 DG |
1562 | struct ltt_ust_channel *uchan; |
1563 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1564 | time_t rawtime; |
1565 | struct tm *timeinfo; | |
1566 | char datetime[16]; | |
1567 | int ret; | |
1568 | ||
1569 | /* Get date and time for unique app path */ | |
1570 | time(&rawtime); | |
1571 | timeinfo = localtime(&rawtime); | |
1572 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1573 | |
421cb601 | 1574 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1575 | |
7972aab2 DG |
1576 | ua_sess->tracing_id = usess->id; |
1577 | ua_sess->id = get_next_session_id(); | |
1578 | ua_sess->uid = app->uid; | |
1579 | ua_sess->gid = app->gid; | |
1580 | ua_sess->euid = usess->uid; | |
1581 | ua_sess->egid = usess->gid; | |
1582 | ua_sess->buffer_type = usess->buffer_type; | |
1583 | ua_sess->bits_per_long = app->bits_per_long; | |
1584 | /* There is only one consumer object per session possible. */ | |
1585 | ua_sess->consumer = usess->consumer; | |
2bba9e53 | 1586 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1587 | ua_sess->live_timer_interval = usess->live_timer_interval; |
7972aab2 DG |
1588 | |
1589 | switch (ua_sess->buffer_type) { | |
1590 | case LTTNG_BUFFER_PER_PID: | |
1591 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1592 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1593 | datetime); |
1594 | break; | |
1595 | case LTTNG_BUFFER_PER_UID: | |
1596 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1597 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1598 | break; | |
1599 | default: | |
1600 | assert(0); | |
1601 | goto error; | |
1602 | } | |
477d7741 MD |
1603 | if (ret < 0) { |
1604 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1605 | assert(0); |
7972aab2 | 1606 | goto error; |
477d7741 MD |
1607 | } |
1608 | ||
48842b30 | 1609 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1610 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1611 | uchan, node.node) { | |
1612 | struct lttng_ht_iter uiter; | |
ba767faf | 1613 | |
bec39940 DG |
1614 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1615 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1616 | if (ua_chan_node != NULL) { |
fc34caaa | 1617 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1618 | continue; |
1619 | } | |
421cb601 | 1620 | |
5b4a0ec0 DG |
1621 | DBG2("Channel %s not found on shadow session copy, creating it", |
1622 | uchan->name); | |
d0b96690 | 1623 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1624 | if (ua_chan == NULL) { |
fc34caaa | 1625 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1626 | continue; |
48842b30 | 1627 | } |
5b4a0ec0 | 1628 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1629 | /* |
1630 | * The concept of metadata channel does not exist on the tracing | |
1631 | * registry side of the session daemon so this can only be a per CPU | |
1632 | * channel and not metadata. | |
1633 | */ | |
1634 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1635 | ||
bec39940 | 1636 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1637 | } |
7972aab2 DG |
1638 | |
1639 | error: | |
1640 | return; | |
48842b30 DG |
1641 | } |
1642 | ||
78f0bacd DG |
1643 | /* |
1644 | * Lookup sesison wrapper. | |
1645 | */ | |
84cd17c6 MD |
1646 | static |
1647 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1648 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1649 | { |
1650 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1651 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1652 | } |
1653 | ||
421cb601 DG |
1654 | /* |
1655 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1656 | * id. |
421cb601 | 1657 | */ |
48842b30 DG |
1658 | static struct ust_app_session *lookup_session_by_app( |
1659 | struct ltt_ust_session *usess, struct ust_app *app) | |
1660 | { | |
bec39940 | 1661 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1662 | struct lttng_ht_node_u64 *node; |
48842b30 | 1663 | |
84cd17c6 | 1664 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1665 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1666 | if (node == NULL) { |
1667 | goto error; | |
1668 | } | |
1669 | ||
1670 | return caa_container_of(node, struct ust_app_session, node); | |
1671 | ||
1672 | error: | |
1673 | return NULL; | |
1674 | } | |
1675 | ||
7972aab2 DG |
1676 | /* |
1677 | * Setup buffer registry per PID for the given session and application. If none | |
1678 | * is found, a new one is created, added to the global registry and | |
1679 | * initialized. If regp is valid, it's set with the newly created object. | |
1680 | * | |
1681 | * Return 0 on success or else a negative value. | |
1682 | */ | |
1683 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1684 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1685 | { | |
1686 | int ret = 0; | |
1687 | struct buffer_reg_pid *reg_pid; | |
1688 | ||
1689 | assert(ua_sess); | |
1690 | assert(app); | |
1691 | ||
1692 | rcu_read_lock(); | |
1693 | ||
1694 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1695 | if (!reg_pid) { | |
1696 | /* | |
1697 | * This is the create channel path meaning that if there is NO | |
1698 | * registry available, we have to create one for this session. | |
1699 | */ | |
1700 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1701 | if (ret < 0) { | |
1702 | goto error; | |
1703 | } | |
1704 | buffer_reg_pid_add(reg_pid); | |
1705 | } else { | |
1706 | goto end; | |
1707 | } | |
1708 | ||
1709 | /* Initialize registry. */ | |
1710 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1711 | app->bits_per_long, app->uint8_t_alignment, | |
1712 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1713 | app->uint64_t_alignment, app->long_alignment, |
1714 | app->byte_order, app->version.major, | |
1715 | app->version.minor); | |
7972aab2 DG |
1716 | if (ret < 0) { |
1717 | goto error; | |
1718 | } | |
1719 | ||
1720 | DBG3("UST app buffer registry per PID created successfully"); | |
1721 | ||
1722 | end: | |
1723 | if (regp) { | |
1724 | *regp = reg_pid; | |
1725 | } | |
1726 | error: | |
1727 | rcu_read_unlock(); | |
1728 | return ret; | |
1729 | } | |
1730 | ||
1731 | /* | |
1732 | * Setup buffer registry per UID for the given session and application. If none | |
1733 | * is found, a new one is created, added to the global registry and | |
1734 | * initialized. If regp is valid, it's set with the newly created object. | |
1735 | * | |
1736 | * Return 0 on success or else a negative value. | |
1737 | */ | |
1738 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1739 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1740 | { | |
1741 | int ret = 0; | |
1742 | struct buffer_reg_uid *reg_uid; | |
1743 | ||
1744 | assert(usess); | |
1745 | assert(app); | |
1746 | ||
1747 | rcu_read_lock(); | |
1748 | ||
1749 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1750 | if (!reg_uid) { | |
1751 | /* | |
1752 | * This is the create channel path meaning that if there is NO | |
1753 | * registry available, we have to create one for this session. | |
1754 | */ | |
1755 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1756 | LTTNG_DOMAIN_UST, ®_uid); | |
1757 | if (ret < 0) { | |
1758 | goto error; | |
1759 | } | |
1760 | buffer_reg_uid_add(reg_uid); | |
1761 | } else { | |
1762 | goto end; | |
1763 | } | |
1764 | ||
1765 | /* Initialize registry. */ | |
af6142cf | 1766 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1767 | app->bits_per_long, app->uint8_t_alignment, |
1768 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1769 | app->uint64_t_alignment, app->long_alignment, |
1770 | app->byte_order, app->version.major, | |
1771 | app->version.minor); | |
7972aab2 DG |
1772 | if (ret < 0) { |
1773 | goto error; | |
1774 | } | |
1775 | /* Add node to teardown list of the session. */ | |
1776 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1777 | ||
1778 | DBG3("UST app buffer registry per UID created successfully"); | |
1779 | ||
1780 | end: | |
1781 | if (regp) { | |
1782 | *regp = reg_uid; | |
1783 | } | |
1784 | error: | |
1785 | rcu_read_unlock(); | |
1786 | return ret; | |
1787 | } | |
1788 | ||
421cb601 | 1789 | /* |
3d8ca23b | 1790 | * Create a session on the tracer side for the given app. |
421cb601 | 1791 | * |
3d8ca23b DG |
1792 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1793 | * untouched. If the session was created, is_created is set to 1. On error, | |
1794 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1795 | * be NULL. | |
1796 | * | |
1797 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1798 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1799 | */ |
3d8ca23b DG |
1800 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1801 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1802 | int *is_created) | |
421cb601 | 1803 | { |
3d8ca23b | 1804 | int ret, created = 0; |
421cb601 DG |
1805 | struct ust_app_session *ua_sess; |
1806 | ||
3d8ca23b DG |
1807 | assert(usess); |
1808 | assert(app); | |
1809 | assert(ua_sess_ptr); | |
1810 | ||
840cb59c | 1811 | health_code_update(); |
86acf0da | 1812 | |
421cb601 DG |
1813 | ua_sess = lookup_session_by_app(usess, app); |
1814 | if (ua_sess == NULL) { | |
d9bf3ca4 | 1815 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1816 | app->pid, usess->id); |
d0b96690 | 1817 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1818 | if (ua_sess == NULL) { |
1819 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1820 | ret = -ENOMEM; |
1821 | goto error; | |
421cb601 | 1822 | } |
477d7741 | 1823 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1824 | created = 1; |
421cb601 DG |
1825 | } |
1826 | ||
7972aab2 DG |
1827 | switch (usess->buffer_type) { |
1828 | case LTTNG_BUFFER_PER_PID: | |
1829 | /* Init local registry. */ | |
1830 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1831 | if (ret < 0) { |
7972aab2 DG |
1832 | goto error; |
1833 | } | |
1834 | break; | |
1835 | case LTTNG_BUFFER_PER_UID: | |
1836 | /* Look for a global registry. If none exists, create one. */ | |
1837 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1838 | if (ret < 0) { | |
1839 | goto error; | |
1840 | } | |
1841 | break; | |
1842 | default: | |
1843 | assert(0); | |
1844 | ret = -EINVAL; | |
1845 | goto error; | |
1846 | } | |
1847 | ||
1848 | health_code_update(); | |
1849 | ||
1850 | if (ua_sess->handle == -1) { | |
1851 | ret = ustctl_create_session(app->sock); | |
1852 | if (ret < 0) { | |
1853 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1854 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1855 | app->pid, ret); |
1856 | } else { | |
1857 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
1858 | /* |
1859 | * This is normal behavior, an application can die during the | |
1860 | * creation process. Don't report an error so the execution can | |
1861 | * continue normally. This will get flagged ENOTCONN and the | |
1862 | * caller will handle it. | |
1863 | */ | |
1864 | ret = 0; | |
ffe60014 | 1865 | } |
d0b96690 | 1866 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1867 | if (ret != -ENOMEM) { |
1868 | /* | |
1869 | * Tracer is probably gone or got an internal error so let's | |
1870 | * behave like it will soon unregister or not usable. | |
1871 | */ | |
1872 | ret = -ENOTCONN; | |
1873 | } | |
1874 | goto error; | |
421cb601 DG |
1875 | } |
1876 | ||
7972aab2 DG |
1877 | ua_sess->handle = ret; |
1878 | ||
1879 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
1880 | lttng_ht_node_init_u64(&ua_sess->node, |
1881 | ua_sess->tracing_id); | |
1882 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1883 | |
1884 | DBG2("UST app session created successfully with handle %d", ret); | |
1885 | } | |
1886 | ||
1887 | *ua_sess_ptr = ua_sess; | |
1888 | if (is_created) { | |
1889 | *is_created = created; | |
1890 | } | |
1891 | ||
1892 | /* Everything went well. */ | |
1893 | ret = 0; | |
1894 | ||
1895 | error: | |
1896 | health_code_update(); | |
1897 | return ret; | |
1898 | } | |
1899 | ||
1900 | /* | |
1901 | * Create a context for the channel on the tracer. | |
1902 | * | |
1903 | * Called with UST app session lock held and a RCU read side lock. | |
1904 | */ | |
1905 | static | |
1906 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1907 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1908 | struct ust_app *app) | |
1909 | { | |
1910 | int ret = 0; | |
1911 | struct lttng_ht_iter iter; | |
1912 | struct lttng_ht_node_ulong *node; | |
1913 | struct ust_app_ctx *ua_ctx; | |
1914 | ||
1915 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1916 | ||
1917 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); | |
1918 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1919 | if (node != NULL) { | |
1920 | ret = -EEXIST; | |
1921 | goto error; | |
1922 | } | |
1923 | ||
1924 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1925 | if (ua_ctx == NULL) { | |
1926 | /* malloc failed */ | |
1927 | ret = -1; | |
1928 | goto error; | |
1929 | } | |
1930 | ||
1931 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
1932 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
31746f93 | 1933 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
1934 | |
1935 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1936 | if (ret < 0) { | |
1937 | goto error; | |
1938 | } | |
1939 | ||
1940 | error: | |
1941 | return ret; | |
1942 | } | |
1943 | ||
1944 | /* | |
1945 | * Enable on the tracer side a ust app event for the session and channel. | |
1946 | * | |
1947 | * Called with UST app session lock held. | |
1948 | */ | |
1949 | static | |
1950 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
1951 | struct ust_app_event *ua_event, struct ust_app *app) | |
1952 | { | |
1953 | int ret; | |
1954 | ||
1955 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1956 | if (ret < 0) { | |
1957 | goto error; | |
1958 | } | |
1959 | ||
1960 | ua_event->enabled = 1; | |
1961 | ||
1962 | error: | |
1963 | return ret; | |
1964 | } | |
1965 | ||
1966 | /* | |
1967 | * Disable on the tracer side a ust app event for the session and channel. | |
1968 | */ | |
1969 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
1970 | struct ust_app_event *ua_event, struct ust_app *app) | |
1971 | { | |
1972 | int ret; | |
1973 | ||
1974 | ret = disable_ust_event(app, ua_sess, ua_event); | |
1975 | if (ret < 0) { | |
1976 | goto error; | |
1977 | } | |
1978 | ||
1979 | ua_event->enabled = 0; | |
1980 | ||
1981 | error: | |
1982 | return ret; | |
1983 | } | |
1984 | ||
1985 | /* | |
1986 | * Lookup ust app channel for session and disable it on the tracer side. | |
1987 | */ | |
1988 | static | |
1989 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
1990 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
1991 | { | |
1992 | int ret; | |
1993 | ||
1994 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
1995 | if (ret < 0) { | |
1996 | goto error; | |
1997 | } | |
1998 | ||
1999 | ua_chan->enabled = 0; | |
2000 | ||
2001 | error: | |
2002 | return ret; | |
2003 | } | |
2004 | ||
2005 | /* | |
2006 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2007 | * MUST be called with a RCU read side lock acquired. | |
2008 | */ | |
2009 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2010 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2011 | { | |
2012 | int ret = 0; | |
2013 | struct lttng_ht_iter iter; | |
2014 | struct lttng_ht_node_str *ua_chan_node; | |
2015 | struct ust_app_channel *ua_chan; | |
2016 | ||
2017 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2018 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2019 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2020 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2021 | uchan->name, ua_sess->tracing_id); |
2022 | goto error; | |
2023 | } | |
2024 | ||
2025 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2026 | ||
2027 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2028 | if (ret < 0) { | |
2029 | goto error; | |
2030 | } | |
2031 | ||
2032 | error: | |
2033 | return ret; | |
2034 | } | |
2035 | ||
2036 | /* | |
2037 | * Ask the consumer to create a channel and get it if successful. | |
2038 | * | |
2039 | * Return 0 on success or else a negative value. | |
2040 | */ | |
2041 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2042 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2043 | int bitness, struct ust_registry_session *registry) | |
2044 | { | |
2045 | int ret; | |
2046 | unsigned int nb_fd = 0; | |
2047 | struct consumer_socket *socket; | |
2048 | ||
2049 | assert(usess); | |
2050 | assert(ua_sess); | |
2051 | assert(ua_chan); | |
2052 | assert(registry); | |
2053 | ||
2054 | rcu_read_lock(); | |
2055 | health_code_update(); | |
2056 | ||
2057 | /* Get the right consumer socket for the application. */ | |
2058 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2059 | if (!socket) { | |
2060 | ret = -EINVAL; | |
2061 | goto error; | |
2062 | } | |
2063 | ||
2064 | health_code_update(); | |
2065 | ||
2066 | /* Need one fd for the channel. */ | |
2067 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2068 | if (ret < 0) { | |
2069 | ERR("Exhausted number of available FD upon create channel"); | |
2070 | goto error; | |
2071 | } | |
2072 | ||
2073 | /* | |
2074 | * Ask consumer to create channel. The consumer will return the number of | |
2075 | * stream we have to expect. | |
2076 | */ | |
2077 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2078 | registry); | |
2079 | if (ret < 0) { | |
2080 | goto error_ask; | |
2081 | } | |
2082 | ||
2083 | /* | |
2084 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2085 | * stream (2 being the default value here). | |
2086 | */ | |
2087 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2088 | ||
2089 | /* Reserve the amount of file descriptor we need. */ | |
2090 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2091 | if (ret < 0) { | |
2092 | ERR("Exhausted number of available FD upon create channel"); | |
2093 | goto error_fd_get_stream; | |
2094 | } | |
2095 | ||
2096 | health_code_update(); | |
2097 | ||
2098 | /* | |
2099 | * Now get the channel from the consumer. This call wil populate the stream | |
2100 | * list of that channel and set the ust objects. | |
2101 | */ | |
d9078d0c DG |
2102 | if (usess->consumer->enabled) { |
2103 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2104 | if (ret < 0) { | |
2105 | goto error_destroy; | |
2106 | } | |
7972aab2 DG |
2107 | } |
2108 | ||
2109 | rcu_read_unlock(); | |
2110 | return 0; | |
2111 | ||
2112 | error_destroy: | |
2113 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2114 | error_fd_get_stream: | |
2115 | /* | |
2116 | * Initiate a destroy channel on the consumer since we had an error | |
2117 | * handling it on our side. The return value is of no importance since we | |
2118 | * already have a ret value set by the previous error that we need to | |
2119 | * return. | |
2120 | */ | |
2121 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2122 | error_ask: | |
2123 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2124 | error: | |
2125 | health_code_update(); | |
2126 | rcu_read_unlock(); | |
2127 | return ret; | |
2128 | } | |
2129 | ||
2130 | /* | |
2131 | * Duplicate the ust data object of the ust app stream and save it in the | |
2132 | * buffer registry stream. | |
2133 | * | |
2134 | * Return 0 on success or else a negative value. | |
2135 | */ | |
2136 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2137 | struct ust_app_stream *stream) | |
2138 | { | |
2139 | int ret; | |
2140 | ||
2141 | assert(reg_stream); | |
2142 | assert(stream); | |
2143 | ||
2144 | /* Reserve the amount of file descriptor we need. */ | |
2145 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2146 | if (ret < 0) { | |
2147 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2148 | goto error; | |
2149 | } | |
2150 | ||
2151 | /* Duplicate object for stream once the original is in the registry. */ | |
2152 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2153 | reg_stream->obj.ust); | |
2154 | if (ret < 0) { | |
2155 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2156 | reg_stream->obj.ust, stream->obj, ret); | |
2157 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2158 | goto error; | |
2159 | } | |
2160 | stream->handle = stream->obj->handle; | |
2161 | ||
2162 | error: | |
2163 | return ret; | |
2164 | } | |
2165 | ||
2166 | /* | |
2167 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2168 | * buffer registry channel. | |
2169 | * | |
2170 | * Return 0 on success or else a negative value. | |
2171 | */ | |
2172 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2173 | struct ust_app_channel *ua_chan) | |
2174 | { | |
2175 | int ret; | |
2176 | ||
2177 | assert(reg_chan); | |
2178 | assert(ua_chan); | |
2179 | ||
2180 | /* Need two fds for the channel. */ | |
2181 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2182 | if (ret < 0) { | |
2183 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2184 | goto error_fd_get; | |
2185 | } | |
2186 | ||
2187 | /* Duplicate object for stream once the original is in the registry. */ | |
2188 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2189 | if (ret < 0) { | |
2190 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2191 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2192 | goto error; | |
2193 | } | |
2194 | ua_chan->handle = ua_chan->obj->handle; | |
2195 | ||
2196 | return 0; | |
2197 | ||
2198 | error: | |
2199 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2200 | error_fd_get: | |
2201 | return ret; | |
2202 | } | |
2203 | ||
2204 | /* | |
2205 | * For a given channel buffer registry, setup all streams of the given ust | |
2206 | * application channel. | |
2207 | * | |
2208 | * Return 0 on success or else a negative value. | |
2209 | */ | |
2210 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2211 | struct ust_app_channel *ua_chan) | |
2212 | { | |
2213 | int ret = 0; | |
2214 | struct ust_app_stream *stream, *stmp; | |
2215 | ||
2216 | assert(reg_chan); | |
2217 | assert(ua_chan); | |
2218 | ||
2219 | DBG2("UST app setup buffer registry stream"); | |
2220 | ||
2221 | /* Send all streams to application. */ | |
2222 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2223 | struct buffer_reg_stream *reg_stream; | |
2224 | ||
2225 | ret = buffer_reg_stream_create(®_stream); | |
2226 | if (ret < 0) { | |
2227 | goto error; | |
2228 | } | |
2229 | ||
2230 | /* | |
2231 | * Keep original pointer and nullify it in the stream so the delete | |
2232 | * stream call does not release the object. | |
2233 | */ | |
2234 | reg_stream->obj.ust = stream->obj; | |
2235 | stream->obj = NULL; | |
2236 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2237 | |
7972aab2 DG |
2238 | /* We don't need the streams anymore. */ |
2239 | cds_list_del(&stream->list); | |
2240 | delete_ust_app_stream(-1, stream); | |
2241 | } | |
421cb601 | 2242 | |
7972aab2 DG |
2243 | error: |
2244 | return ret; | |
2245 | } | |
2246 | ||
2247 | /* | |
2248 | * Create a buffer registry channel for the given session registry and | |
2249 | * application channel object. If regp pointer is valid, it's set with the | |
2250 | * created object. Important, the created object is NOT added to the session | |
2251 | * registry hash table. | |
2252 | * | |
2253 | * Return 0 on success else a negative value. | |
2254 | */ | |
2255 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2256 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2257 | { | |
2258 | int ret; | |
2259 | struct buffer_reg_channel *reg_chan = NULL; | |
2260 | ||
2261 | assert(reg_sess); | |
2262 | assert(ua_chan); | |
2263 | ||
2264 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2265 | ||
2266 | /* Create buffer registry channel. */ | |
2267 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2268 | if (ret < 0) { | |
2269 | goto error_create; | |
421cb601 | 2270 | } |
7972aab2 DG |
2271 | assert(reg_chan); |
2272 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2273 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
421cb601 | 2274 | |
7972aab2 DG |
2275 | /* Create and add a channel registry to session. */ |
2276 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2277 | ua_chan->tracing_channel_id); | |
2278 | if (ret < 0) { | |
2279 | goto error; | |
d88aee68 | 2280 | } |
7972aab2 | 2281 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2282 | |
7972aab2 DG |
2283 | if (regp) { |
2284 | *regp = reg_chan; | |
3d8ca23b | 2285 | } |
d88aee68 | 2286 | |
7972aab2 | 2287 | return 0; |
3d8ca23b DG |
2288 | |
2289 | error: | |
7972aab2 DG |
2290 | /* Safe because the registry channel object was not added to any HT. */ |
2291 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2292 | error_create: | |
3d8ca23b | 2293 | return ret; |
421cb601 DG |
2294 | } |
2295 | ||
55cc08a6 | 2296 | /* |
7972aab2 DG |
2297 | * Setup buffer registry channel for the given session registry and application |
2298 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2299 | * |
7972aab2 | 2300 | * Return 0 on success else a negative value. |
55cc08a6 | 2301 | */ |
7972aab2 DG |
2302 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2303 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2304 | { |
7972aab2 | 2305 | int ret; |
55cc08a6 | 2306 | |
7972aab2 DG |
2307 | assert(reg_sess); |
2308 | assert(reg_chan); | |
2309 | assert(ua_chan); | |
2310 | assert(ua_chan->obj); | |
55cc08a6 | 2311 | |
7972aab2 | 2312 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2313 | |
7972aab2 DG |
2314 | /* Setup all streams for the registry. */ |
2315 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2316 | if (ret < 0) { | |
55cc08a6 DG |
2317 | goto error; |
2318 | } | |
2319 | ||
7972aab2 DG |
2320 | reg_chan->obj.ust = ua_chan->obj; |
2321 | ua_chan->obj = NULL; | |
55cc08a6 | 2322 | |
7972aab2 | 2323 | return 0; |
55cc08a6 DG |
2324 | |
2325 | error: | |
7972aab2 DG |
2326 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2327 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2328 | return ret; |
2329 | } | |
2330 | ||
edb67388 | 2331 | /* |
7972aab2 | 2332 | * Send buffer registry channel to the application. |
d0b96690 | 2333 | * |
7972aab2 | 2334 | * Return 0 on success else a negative value. |
edb67388 | 2335 | */ |
7972aab2 DG |
2336 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2337 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2338 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2339 | { |
2340 | int ret; | |
7972aab2 | 2341 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2342 | |
7972aab2 DG |
2343 | assert(reg_chan); |
2344 | assert(app); | |
2345 | assert(ua_sess); | |
2346 | assert(ua_chan); | |
2347 | ||
2348 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2349 | ||
2350 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2351 | if (ret < 0) { |
2352 | goto error; | |
2353 | } | |
2354 | ||
7972aab2 DG |
2355 | /* Send channel to the application. */ |
2356 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2357 | if (ret < 0) { | |
2358 | goto error; | |
2359 | } | |
2360 | ||
2361 | health_code_update(); | |
2362 | ||
2363 | /* Send all streams to application. */ | |
2364 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2365 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2366 | struct ust_app_stream stream; | |
2367 | ||
2368 | ret = duplicate_stream_object(reg_stream, &stream); | |
2369 | if (ret < 0) { | |
2370 | goto error_stream_unlock; | |
2371 | } | |
2372 | ||
2373 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2374 | if (ret < 0) { | |
8c067051 | 2375 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2376 | goto error_stream_unlock; |
2377 | } | |
edb67388 | 2378 | |
7972aab2 DG |
2379 | /* |
2380 | * The return value is not important here. This function will output an | |
2381 | * error if needed. | |
2382 | */ | |
2383 | (void) release_ust_app_stream(-1, &stream); | |
2384 | } | |
2385 | ua_chan->is_sent = 1; | |
2386 | ||
2387 | error_stream_unlock: | |
2388 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2389 | error: |
2390 | return ret; | |
2391 | } | |
2392 | ||
9730260e | 2393 | /* |
7972aab2 DG |
2394 | * Create and send to the application the created buffers with per UID buffers. |
2395 | * | |
2396 | * Return 0 on success else a negative value. | |
9730260e | 2397 | */ |
7972aab2 DG |
2398 | static int create_channel_per_uid(struct ust_app *app, |
2399 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2400 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2401 | { |
2402 | int ret; | |
7972aab2 DG |
2403 | struct buffer_reg_uid *reg_uid; |
2404 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2405 | |
7972aab2 DG |
2406 | assert(app); |
2407 | assert(usess); | |
2408 | assert(ua_sess); | |
2409 | assert(ua_chan); | |
2410 | ||
2411 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2412 | ||
2413 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2414 | /* | |
2415 | * The session creation handles the creation of this global registry | |
2416 | * object. If none can be find, there is a code flow problem or a | |
2417 | * teardown race. | |
2418 | */ | |
2419 | assert(reg_uid); | |
2420 | ||
2421 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2422 | reg_uid); | |
2423 | if (!reg_chan) { | |
2424 | /* Create the buffer registry channel object. */ | |
2425 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2426 | if (ret < 0) { | |
2427 | goto error; | |
2428 | } | |
2429 | assert(reg_chan); | |
2430 | ||
2431 | /* | |
2432 | * Create the buffers on the consumer side. This call populates the | |
2433 | * ust app channel object with all streams and data object. | |
2434 | */ | |
2435 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2436 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2437 | if (ret < 0) { | |
07d2ae95 DG |
2438 | /* |
2439 | * Let's remove the previously created buffer registry channel so | |
2440 | * it's not visible anymore in the session registry. | |
2441 | */ | |
2442 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2443 | ua_chan->tracing_channel_id); | |
2444 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2445 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2446 | goto error; |
2447 | } | |
2448 | ||
2449 | /* | |
2450 | * Setup the streams and add it to the session registry. | |
2451 | */ | |
2452 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2453 | if (ret < 0) { | |
2454 | goto error; | |
2455 | } | |
2456 | ||
2457 | } | |
2458 | ||
2459 | /* Send buffers to the application. */ | |
2460 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2461 | if (ret < 0) { |
2462 | goto error; | |
2463 | } | |
2464 | ||
9730260e DG |
2465 | error: |
2466 | return ret; | |
2467 | } | |
2468 | ||
78f0bacd | 2469 | /* |
7972aab2 DG |
2470 | * Create and send to the application the created buffers with per PID buffers. |
2471 | * | |
2472 | * Return 0 on success else a negative value. | |
78f0bacd | 2473 | */ |
7972aab2 DG |
2474 | static int create_channel_per_pid(struct ust_app *app, |
2475 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2476 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2477 | { |
8535a6d9 | 2478 | int ret; |
7972aab2 | 2479 | struct ust_registry_session *registry; |
78f0bacd | 2480 | |
7972aab2 DG |
2481 | assert(app); |
2482 | assert(usess); | |
2483 | assert(ua_sess); | |
2484 | assert(ua_chan); | |
2485 | ||
2486 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2487 | ||
2488 | rcu_read_lock(); | |
2489 | ||
2490 | registry = get_session_registry(ua_sess); | |
2491 | assert(registry); | |
2492 | ||
2493 | /* Create and add a new channel registry to session. */ | |
2494 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2495 | if (ret < 0) { |
2496 | goto error; | |
2497 | } | |
2498 | ||
7972aab2 DG |
2499 | /* Create and get channel on the consumer side. */ |
2500 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2501 | app->bits_per_long, registry); | |
2502 | if (ret < 0) { | |
2503 | goto error; | |
2504 | } | |
2505 | ||
2506 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2507 | if (ret < 0) { | |
2508 | goto error; | |
2509 | } | |
8535a6d9 | 2510 | |
78f0bacd | 2511 | error: |
7972aab2 | 2512 | rcu_read_unlock(); |
78f0bacd DG |
2513 | return ret; |
2514 | } | |
2515 | ||
2516 | /* | |
7972aab2 DG |
2517 | * From an already allocated ust app channel, create the channel buffers if |
2518 | * need and send it to the application. This MUST be called with a RCU read | |
2519 | * side lock acquired. | |
2520 | * | |
2521 | * Return 0 on success or else a negative value. | |
78f0bacd | 2522 | */ |
7972aab2 DG |
2523 | static int do_create_channel(struct ust_app *app, |
2524 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2525 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2526 | { |
7972aab2 | 2527 | int ret; |
78f0bacd | 2528 | |
7972aab2 DG |
2529 | assert(app); |
2530 | assert(usess); | |
2531 | assert(ua_sess); | |
2532 | assert(ua_chan); | |
2533 | ||
2534 | /* Handle buffer type before sending the channel to the application. */ | |
2535 | switch (usess->buffer_type) { | |
2536 | case LTTNG_BUFFER_PER_UID: | |
2537 | { | |
2538 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2539 | if (ret < 0) { | |
2540 | goto error; | |
2541 | } | |
2542 | break; | |
2543 | } | |
2544 | case LTTNG_BUFFER_PER_PID: | |
2545 | { | |
2546 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2547 | if (ret < 0) { | |
2548 | goto error; | |
2549 | } | |
2550 | break; | |
2551 | } | |
2552 | default: | |
2553 | assert(0); | |
2554 | ret = -EINVAL; | |
78f0bacd DG |
2555 | goto error; |
2556 | } | |
2557 | ||
7972aab2 DG |
2558 | /* Initialize ust objd object using the received handle and add it. */ |
2559 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2560 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2561 | |
7972aab2 DG |
2562 | /* If channel is not enabled, disable it on the tracer */ |
2563 | if (!ua_chan->enabled) { | |
2564 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2565 | if (ret < 0) { | |
2566 | goto error; | |
2567 | } | |
78f0bacd DG |
2568 | } |
2569 | ||
2570 | error: | |
2571 | return ret; | |
2572 | } | |
2573 | ||
284d8f55 | 2574 | /* |
4d710ac2 DG |
2575 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2576 | * newly created channel if not NULL. | |
d0b96690 | 2577 | * |
36b588ed | 2578 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2579 | * |
2580 | * Return 0 on success or else a negative value. | |
284d8f55 | 2581 | */ |
4d710ac2 DG |
2582 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2583 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2584 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2585 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2586 | { |
2587 | int ret = 0; | |
bec39940 DG |
2588 | struct lttng_ht_iter iter; |
2589 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2590 | struct ust_app_channel *ua_chan; |
2591 | ||
2592 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2593 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2594 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2595 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2596 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2597 | goto end; |
5b4a0ec0 DG |
2598 | } |
2599 | ||
d0b96690 | 2600 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2601 | if (ua_chan == NULL) { |
2602 | /* Only malloc can fail here */ | |
4d710ac2 | 2603 | ret = -ENOMEM; |
094d1690 | 2604 | goto error_alloc; |
fc34caaa DG |
2605 | } |
2606 | shadow_copy_channel(ua_chan, uchan); | |
2607 | ||
ffe60014 DG |
2608 | /* Set channel type. */ |
2609 | ua_chan->attr.type = type; | |
2610 | ||
7972aab2 | 2611 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2612 | if (ret < 0) { |
2613 | goto error; | |
2614 | } | |
2615 | ||
fc34caaa | 2616 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2617 | app->pid); |
fc34caaa | 2618 | |
d0b96690 DG |
2619 | /* Only add the channel if successful on the tracer side. */ |
2620 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2621 | ||
fc34caaa | 2622 | end: |
4d710ac2 DG |
2623 | if (ua_chanp) { |
2624 | *ua_chanp = ua_chan; | |
2625 | } | |
2626 | ||
2627 | /* Everything went well. */ | |
2628 | return 0; | |
5b4a0ec0 DG |
2629 | |
2630 | error: | |
d0b96690 | 2631 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2632 | error_alloc: |
4d710ac2 | 2633 | return ret; |
5b4a0ec0 DG |
2634 | } |
2635 | ||
2636 | /* | |
2637 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2638 | * |
2639 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2640 | */ |
edb67388 DG |
2641 | static |
2642 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2643 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2644 | struct ust_app *app) | |
284d8f55 | 2645 | { |
edb67388 | 2646 | int ret = 0; |
5b4a0ec0 | 2647 | struct ust_app_event *ua_event; |
284d8f55 | 2648 | |
5b4a0ec0 | 2649 | /* Get event node */ |
18eace3b | 2650 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 2651 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 2652 | if (ua_event != NULL) { |
fc34caaa | 2653 | ret = -EEXIST; |
edb67388 DG |
2654 | goto end; |
2655 | } | |
5b4a0ec0 | 2656 | |
edb67388 DG |
2657 | /* Does not exist so create one */ |
2658 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2659 | if (ua_event == NULL) { | |
2660 | /* Only malloc can failed so something is really wrong */ | |
2661 | ret = -ENOMEM; | |
fc34caaa | 2662 | goto end; |
5b4a0ec0 | 2663 | } |
edb67388 | 2664 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2665 | |
edb67388 | 2666 | /* Create it on the tracer side */ |
5b4a0ec0 | 2667 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2668 | if (ret < 0) { |
fc34caaa | 2669 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2670 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2671 | goto error; |
2672 | } | |
2673 | ||
d0b96690 | 2674 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2675 | |
fc34caaa | 2676 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2677 | app->pid); |
7f79d3a1 | 2678 | |
edb67388 | 2679 | end: |
fc34caaa DG |
2680 | return ret; |
2681 | ||
5b4a0ec0 | 2682 | error: |
fc34caaa DG |
2683 | /* Valid. Calling here is already in a read side lock */ |
2684 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2685 | return ret; |
5b4a0ec0 DG |
2686 | } |
2687 | ||
2688 | /* | |
2689 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2690 | * |
7972aab2 | 2691 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2692 | */ |
2693 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
d65d2de8 DG |
2694 | struct ust_app *app, struct consumer_output *consumer, |
2695 | struct ustctl_consumer_channel_attr *attr) | |
5b4a0ec0 DG |
2696 | { |
2697 | int ret = 0; | |
ffe60014 | 2698 | struct ust_app_channel *metadata; |
d88aee68 | 2699 | struct consumer_socket *socket; |
7972aab2 | 2700 | struct ust_registry_session *registry; |
5b4a0ec0 | 2701 | |
ffe60014 DG |
2702 | assert(ua_sess); |
2703 | assert(app); | |
d88aee68 | 2704 | assert(consumer); |
5b4a0ec0 | 2705 | |
7972aab2 DG |
2706 | registry = get_session_registry(ua_sess); |
2707 | assert(registry); | |
2708 | ||
1b532a60 DG |
2709 | /* Metadata already exists for this registry or it was closed previously */ |
2710 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2711 | ret = 0; |
2712 | goto error; | |
5b4a0ec0 DG |
2713 | } |
2714 | ||
ffe60014 | 2715 | /* Allocate UST metadata */ |
d0b96690 | 2716 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2717 | if (!metadata) { |
2718 | /* malloc() failed */ | |
2719 | ret = -ENOMEM; | |
2720 | goto error; | |
2721 | } | |
5b4a0ec0 | 2722 | |
d65d2de8 DG |
2723 | if (!attr) { |
2724 | /* Set default attributes for metadata. */ | |
2725 | metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
2726 | metadata->attr.subbuf_size = default_get_metadata_subbuf_size(); | |
2727 | metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
0a9c6494 DG |
2728 | metadata->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER; |
2729 | metadata->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER; | |
d65d2de8 DG |
2730 | metadata->attr.output = LTTNG_UST_MMAP; |
2731 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2732 | } else { | |
2733 | memcpy(&metadata->attr, attr, sizeof(metadata->attr)); | |
2734 | metadata->attr.output = LTTNG_UST_MMAP; | |
2735 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2736 | } | |
5b4a0ec0 | 2737 | |
7972aab2 DG |
2738 | /* Need one fd for the channel. */ |
2739 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2740 | if (ret < 0) { | |
2741 | ERR("Exhausted number of available FD upon create metadata"); | |
2742 | goto error; | |
2743 | } | |
2744 | ||
4dc3dfc5 DG |
2745 | /* Get the right consumer socket for the application. */ |
2746 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2747 | if (!socket) { | |
2748 | ret = -EINVAL; | |
2749 | goto error_consumer; | |
2750 | } | |
2751 | ||
331744e3 JD |
2752 | /* |
2753 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2754 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2755 | * consumer requesting the metadata and the ask_channel call on our side | |
2756 | * did not returned yet. | |
2757 | */ | |
2758 | registry->metadata_key = metadata->key; | |
2759 | ||
d88aee68 DG |
2760 | /* |
2761 | * Ask the metadata channel creation to the consumer. The metadata object | |
2762 | * will be created by the consumer and kept their. However, the stream is | |
2763 | * never added or monitored until we do a first push metadata to the | |
2764 | * consumer. | |
2765 | */ | |
7972aab2 DG |
2766 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2767 | registry); | |
d88aee68 | 2768 | if (ret < 0) { |
f2a444f1 DG |
2769 | /* Nullify the metadata key so we don't try to close it later on. */ |
2770 | registry->metadata_key = 0; | |
d88aee68 DG |
2771 | goto error_consumer; |
2772 | } | |
2773 | ||
2774 | /* | |
2775 | * The setup command will make the metadata stream be sent to the relayd, | |
2776 | * if applicable, and the thread managing the metadatas. This is important | |
2777 | * because after this point, if an error occurs, the only way the stream | |
2778 | * can be deleted is to be monitored in the consumer. | |
2779 | */ | |
7972aab2 | 2780 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2781 | if (ret < 0) { |
f2a444f1 DG |
2782 | /* Nullify the metadata key so we don't try to close it later on. */ |
2783 | registry->metadata_key = 0; | |
d88aee68 | 2784 | goto error_consumer; |
5b4a0ec0 DG |
2785 | } |
2786 | ||
7972aab2 DG |
2787 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2788 | metadata->key, app->pid); | |
5b4a0ec0 | 2789 | |
d88aee68 | 2790 | error_consumer: |
b80f0b6c | 2791 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2792 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2793 | error: |
ffe60014 | 2794 | return ret; |
5b4a0ec0 DG |
2795 | } |
2796 | ||
2797 | /* | |
2798 | * Return pointer to traceable apps list. | |
2799 | */ | |
bec39940 | 2800 | struct lttng_ht *ust_app_get_ht(void) |
5b4a0ec0 DG |
2801 | { |
2802 | return ust_app_ht; | |
2803 | } | |
2804 | ||
2805 | /* | |
d88aee68 DG |
2806 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2807 | * acquired before calling this function. | |
5b4a0ec0 DG |
2808 | */ |
2809 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2810 | { | |
d88aee68 | 2811 | struct ust_app *app = NULL; |
bec39940 DG |
2812 | struct lttng_ht_node_ulong *node; |
2813 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2814 | |
bec39940 DG |
2815 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2816 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2817 | if (node == NULL) { |
2818 | DBG2("UST app no found with pid %d", pid); | |
2819 | goto error; | |
2820 | } | |
5b4a0ec0 DG |
2821 | |
2822 | DBG2("Found UST app by pid %d", pid); | |
2823 | ||
d88aee68 | 2824 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2825 | |
2826 | error: | |
d88aee68 | 2827 | return app; |
5b4a0ec0 DG |
2828 | } |
2829 | ||
d88aee68 DG |
2830 | /* |
2831 | * Allocate and init an UST app object using the registration information and | |
2832 | * the command socket. This is called when the command socket connects to the | |
2833 | * session daemon. | |
2834 | * | |
2835 | * The object is returned on success or else NULL. | |
2836 | */ | |
d0b96690 | 2837 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2838 | { |
d0b96690 DG |
2839 | struct ust_app *lta = NULL; |
2840 | ||
2841 | assert(msg); | |
2842 | assert(sock >= 0); | |
2843 | ||
2844 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2845 | |
173af62f DG |
2846 | if ((msg->bits_per_long == 64 && |
2847 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2848 | || (msg->bits_per_long == 32 && | |
2849 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2850 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2851 | "%d-bit long, but no consumerd for this size is available.\n", |
2852 | msg->name, msg->pid, msg->bits_per_long); | |
2853 | goto error; | |
3f2c5fcc | 2854 | } |
d0b96690 | 2855 | |
5b4a0ec0 DG |
2856 | lta = zmalloc(sizeof(struct ust_app)); |
2857 | if (lta == NULL) { | |
2858 | PERROR("malloc"); | |
d0b96690 | 2859 | goto error; |
5b4a0ec0 DG |
2860 | } |
2861 | ||
2862 | lta->ppid = msg->ppid; | |
2863 | lta->uid = msg->uid; | |
2864 | lta->gid = msg->gid; | |
d0b96690 | 2865 | |
7753dea8 | 2866 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2867 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2868 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2869 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2870 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2871 | lta->long_alignment = msg->long_alignment; | |
2872 | lta->byte_order = msg->byte_order; | |
2873 | ||
5b4a0ec0 DG |
2874 | lta->v_major = msg->major; |
2875 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 2876 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
2877 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2878 | lta->notify_sock = -1; | |
d88aee68 DG |
2879 | |
2880 | /* Copy name and make sure it's NULL terminated. */ | |
2881 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2882 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2883 | ||
2884 | /* | |
2885 | * Before this can be called, when receiving the registration information, | |
2886 | * the application compatibility is checked. So, at this point, the | |
2887 | * application can work with this session daemon. | |
2888 | */ | |
d0b96690 | 2889 | lta->compatible = 1; |
5b4a0ec0 | 2890 | |
852d0037 | 2891 | lta->pid = msg->pid; |
d0b96690 | 2892 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2893 | lta->sock = sock; |
d0b96690 | 2894 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2895 | |
d42f20df DG |
2896 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2897 | ||
d0b96690 DG |
2898 | error: |
2899 | return lta; | |
2900 | } | |
2901 | ||
d88aee68 DG |
2902 | /* |
2903 | * For a given application object, add it to every hash table. | |
2904 | */ | |
d0b96690 DG |
2905 | void ust_app_add(struct ust_app *app) |
2906 | { | |
2907 | assert(app); | |
2908 | assert(app->notify_sock >= 0); | |
2909 | ||
5b4a0ec0 | 2910 | rcu_read_lock(); |
852d0037 DG |
2911 | |
2912 | /* | |
2913 | * On a re-registration, we want to kick out the previous registration of | |
2914 | * that pid | |
2915 | */ | |
d0b96690 | 2916 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
2917 | |
2918 | /* | |
2919 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
2920 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
2921 | * already in the table. | |
2922 | */ | |
d0b96690 | 2923 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 2924 | |
d0b96690 DG |
2925 | /* Add application to the notify socket hash table. */ |
2926 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
2927 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 2928 | |
d0b96690 | 2929 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
2930 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
2931 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
2932 | app->v_minor); | |
5b4a0ec0 | 2933 | |
d0b96690 DG |
2934 | rcu_read_unlock(); |
2935 | } | |
2936 | ||
d88aee68 DG |
2937 | /* |
2938 | * Set the application version into the object. | |
2939 | * | |
2940 | * Return 0 on success else a negative value either an errno code or a | |
2941 | * LTTng-UST error code. | |
2942 | */ | |
d0b96690 DG |
2943 | int ust_app_version(struct ust_app *app) |
2944 | { | |
d88aee68 DG |
2945 | int ret; |
2946 | ||
d0b96690 | 2947 | assert(app); |
d88aee68 DG |
2948 | |
2949 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2950 | if (ret < 0) { | |
2951 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2952 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2953 | } else { | |
2954 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2955 | } | |
2956 | } | |
2957 | ||
2958 | return ret; | |
5b4a0ec0 DG |
2959 | } |
2960 | ||
2961 | /* | |
2962 | * Unregister app by removing it from the global traceable app list and freeing | |
2963 | * the data struct. | |
2964 | * | |
2965 | * The socket is already closed at this point so no close to sock. | |
2966 | */ | |
2967 | void ust_app_unregister(int sock) | |
2968 | { | |
2969 | struct ust_app *lta; | |
bec39940 DG |
2970 | struct lttng_ht_node_ulong *node; |
2971 | struct lttng_ht_iter iter; | |
d42f20df | 2972 | struct ust_app_session *ua_sess; |
525b0740 | 2973 | int ret; |
5b4a0ec0 DG |
2974 | |
2975 | rcu_read_lock(); | |
886459c6 | 2976 | |
5b4a0ec0 | 2977 | /* Get the node reference for a call_rcu */ |
852d0037 | 2978 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 2979 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 2980 | assert(node); |
284d8f55 | 2981 | |
852d0037 | 2982 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
2983 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
2984 | ||
886459c6 | 2985 | /* Remove application from PID hash table */ |
852d0037 DG |
2986 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
2987 | assert(!ret); | |
2988 | ||
d88aee68 DG |
2989 | /* |
2990 | * Remove application from notify hash table. The thread handling the | |
2991 | * notify socket could have deleted the node so ignore on error because | |
2992 | * either way it's valid. The close of that socket is handled by the other | |
2993 | * thread. | |
2994 | */ | |
d0b96690 | 2995 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 2996 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 2997 | |
5b98a774 DG |
2998 | /* |
2999 | * Ignore return value since the node might have been removed before by an | |
3000 | * add replace during app registration because the PID can be reassigned by | |
3001 | * the OS. | |
3002 | */ | |
d0b96690 | 3003 | iter.iter.node = <a->pid_n.node; |
bec39940 | 3004 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
3005 | if (ret) { |
3006 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3007 | lta->pid); | |
3008 | } | |
852d0037 | 3009 | |
d42f20df DG |
3010 | /* Remove sessions so they are not visible during deletion.*/ |
3011 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
3012 | node.node) { | |
7972aab2 DG |
3013 | struct ust_registry_session *registry; |
3014 | ||
d42f20df DG |
3015 | ret = lttng_ht_del(lta->sessions, &iter); |
3016 | if (ret) { | |
3017 | /* The session was already removed so scheduled for teardown. */ | |
3018 | continue; | |
3019 | } | |
3020 | ||
3021 | /* | |
3022 | * Add session to list for teardown. This is safe since at this point we | |
3023 | * are the only one using this list. | |
3024 | */ | |
d88aee68 DG |
3025 | pthread_mutex_lock(&ua_sess->lock); |
3026 | ||
3027 | /* | |
3028 | * Normally, this is done in the delete session process which is | |
3029 | * executed in the call rcu below. However, upon registration we can't | |
3030 | * afford to wait for the grace period before pushing data or else the | |
3031 | * data pending feature can race between the unregistration and stop | |
3032 | * command where the data pending command is sent *before* the grace | |
3033 | * period ended. | |
3034 | * | |
3035 | * The close metadata below nullifies the metadata pointer in the | |
3036 | * session so the delete session will NOT push/close a second time. | |
3037 | */ | |
7972aab2 | 3038 | registry = get_session_registry(ua_sess); |
1b532a60 | 3039 | if (registry && !registry->metadata_closed) { |
7972aab2 DG |
3040 | /* Push metadata for application before freeing the application. */ |
3041 | (void) push_metadata(registry, ua_sess->consumer); | |
3042 | ||
3043 | /* | |
3044 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3045 | * metadata only on destroy trace session in this case. Also, the |
3046 | * previous push metadata could have flag the metadata registry to | |
3047 | * close so don't send a close command if closed. | |
7972aab2 | 3048 | */ |
1b532a60 DG |
3049 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
3050 | !registry->metadata_closed) { | |
7972aab2 DG |
3051 | /* And ask to close it for this session registry. */ |
3052 | (void) close_metadata(registry, ua_sess->consumer); | |
3053 | } | |
3054 | } | |
d88aee68 | 3055 | |
d42f20df | 3056 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 3057 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3058 | } |
3059 | ||
852d0037 DG |
3060 | /* Free memory */ |
3061 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3062 | ||
5b4a0ec0 DG |
3063 | rcu_read_unlock(); |
3064 | return; | |
284d8f55 DG |
3065 | } |
3066 | ||
3067 | /* | |
5b4a0ec0 | 3068 | * Return traceable_app_count |
284d8f55 | 3069 | */ |
5b4a0ec0 | 3070 | unsigned long ust_app_list_count(void) |
284d8f55 | 3071 | { |
5b4a0ec0 | 3072 | unsigned long count; |
284d8f55 | 3073 | |
5b4a0ec0 | 3074 | rcu_read_lock(); |
bec39940 | 3075 | count = lttng_ht_get_count(ust_app_ht); |
5b4a0ec0 | 3076 | rcu_read_unlock(); |
284d8f55 | 3077 | |
5b4a0ec0 | 3078 | return count; |
284d8f55 DG |
3079 | } |
3080 | ||
5b4a0ec0 DG |
3081 | /* |
3082 | * Fill events array with all events name of all registered apps. | |
3083 | */ | |
3084 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3085 | { |
5b4a0ec0 DG |
3086 | int ret, handle; |
3087 | size_t nbmem, count = 0; | |
bec39940 | 3088 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3089 | struct ust_app *app; |
c617c0c6 | 3090 | struct lttng_event *tmp_event; |
421cb601 | 3091 | |
5b4a0ec0 | 3092 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3093 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3094 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3095 | PERROR("zmalloc ust app events"); |
3096 | ret = -ENOMEM; | |
421cb601 DG |
3097 | goto error; |
3098 | } | |
3099 | ||
5b4a0ec0 | 3100 | rcu_read_lock(); |
421cb601 | 3101 | |
852d0037 | 3102 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3103 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3104 | |
840cb59c | 3105 | health_code_update(); |
86acf0da | 3106 | |
e0c7ec2b DG |
3107 | if (!app->compatible) { |
3108 | /* | |
3109 | * TODO: In time, we should notice the caller of this error by | |
3110 | * telling him that this is a version error. | |
3111 | */ | |
3112 | continue; | |
3113 | } | |
852d0037 | 3114 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3115 | if (handle < 0) { |
ffe60014 DG |
3116 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3117 | ERR("UST app list events getting handle failed for app pid %d", | |
3118 | app->pid); | |
3119 | } | |
5b4a0ec0 DG |
3120 | continue; |
3121 | } | |
421cb601 | 3122 | |
852d0037 | 3123 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3124 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3125 | /* Handle ustctl error. */ |
3126 | if (ret < 0) { | |
3127 | free(tmp_event); | |
3128 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3129 | ERR("UST app tp list get failed for app %d with ret %d", | |
3130 | app->sock, ret); | |
3131 | } else { | |
3132 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3133 | /* |
3134 | * This is normal behavior, an application can die during the | |
3135 | * creation process. Don't report an error so the execution can | |
3136 | * continue normally. Continue normal execution. | |
3137 | */ | |
3138 | break; | |
ffe60014 DG |
3139 | } |
3140 | goto rcu_error; | |
3141 | } | |
3142 | ||
840cb59c | 3143 | health_code_update(); |
815564d8 | 3144 | if (count >= nbmem) { |
d7b3776f | 3145 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3146 | void *ptr; |
3147 | ||
815564d8 MD |
3148 | DBG2("Reallocating event list from %zu to %zu entries", nbmem, |
3149 | 2 * nbmem); | |
3150 | nbmem *= 2; | |
c617c0c6 MD |
3151 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event)); |
3152 | if (ptr == NULL) { | |
5b4a0ec0 | 3153 | PERROR("realloc ust app events"); |
c617c0c6 | 3154 | free(tmp_event); |
5b4a0ec0 DG |
3155 | ret = -ENOMEM; |
3156 | goto rcu_error; | |
3157 | } | |
c617c0c6 | 3158 | tmp_event = ptr; |
5b4a0ec0 | 3159 | } |
c617c0c6 MD |
3160 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3161 | tmp_event[count].loglevel = uiter.loglevel; | |
3162 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3163 | tmp_event[count].pid = app->pid; | |
3164 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3165 | count++; |
421cb601 | 3166 | } |
421cb601 DG |
3167 | } |
3168 | ||
5b4a0ec0 | 3169 | ret = count; |
c617c0c6 | 3170 | *events = tmp_event; |
421cb601 | 3171 | |
5b4a0ec0 | 3172 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3173 | |
5b4a0ec0 DG |
3174 | rcu_error: |
3175 | rcu_read_unlock(); | |
421cb601 | 3176 | error: |
840cb59c | 3177 | health_code_update(); |
5b4a0ec0 | 3178 | return ret; |
421cb601 DG |
3179 | } |
3180 | ||
f37d259d MD |
3181 | /* |
3182 | * Fill events array with all events name of all registered apps. | |
3183 | */ | |
3184 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3185 | { | |
3186 | int ret, handle; | |
3187 | size_t nbmem, count = 0; | |
3188 | struct lttng_ht_iter iter; | |
3189 | struct ust_app *app; | |
c617c0c6 | 3190 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3191 | |
3192 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3193 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3194 | if (tmp_event == NULL) { | |
f37d259d MD |
3195 | PERROR("zmalloc ust app event fields"); |
3196 | ret = -ENOMEM; | |
3197 | goto error; | |
3198 | } | |
3199 | ||
3200 | rcu_read_lock(); | |
3201 | ||
3202 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3203 | struct lttng_ust_field_iter uiter; | |
3204 | ||
840cb59c | 3205 | health_code_update(); |
86acf0da | 3206 | |
f37d259d MD |
3207 | if (!app->compatible) { |
3208 | /* | |
3209 | * TODO: In time, we should notice the caller of this error by | |
3210 | * telling him that this is a version error. | |
3211 | */ | |
3212 | continue; | |
3213 | } | |
3214 | handle = ustctl_tracepoint_field_list(app->sock); | |
3215 | if (handle < 0) { | |
ffe60014 DG |
3216 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3217 | ERR("UST app list field getting handle failed for app pid %d", | |
3218 | app->pid); | |
3219 | } | |
f37d259d MD |
3220 | continue; |
3221 | } | |
3222 | ||
3223 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3224 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3225 | /* Handle ustctl error. */ |
3226 | if (ret < 0) { | |
3227 | free(tmp_event); | |
3228 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3229 | ERR("UST app tp list field failed for app %d with ret %d", | |
3230 | app->sock, ret); | |
3231 | } else { | |
3232 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3233 | /* |
3234 | * This is normal behavior, an application can die during the | |
3235 | * creation process. Don't report an error so the execution can | |
3236 | * continue normally. | |
3237 | */ | |
3238 | break; | |
ffe60014 DG |
3239 | } |
3240 | goto rcu_error; | |
3241 | } | |
3242 | ||
840cb59c | 3243 | health_code_update(); |
f37d259d | 3244 | if (count >= nbmem) { |
d7b3776f | 3245 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3246 | void *ptr; |
3247 | ||
f37d259d MD |
3248 | DBG2("Reallocating event field list from %zu to %zu entries", nbmem, |
3249 | 2 * nbmem); | |
3250 | nbmem *= 2; | |
c617c0c6 MD |
3251 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field)); |
3252 | if (ptr == NULL) { | |
f37d259d | 3253 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3254 | free(tmp_event); |
f37d259d MD |
3255 | ret = -ENOMEM; |
3256 | goto rcu_error; | |
3257 | } | |
c617c0c6 | 3258 | tmp_event = ptr; |
f37d259d | 3259 | } |
f37d259d | 3260 | |
c617c0c6 MD |
3261 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
3262 | tmp_event[count].type = uiter.type; | |
3263 | tmp_event[count].nowrite = uiter.nowrite; | |
f37d259d | 3264 | |
c617c0c6 MD |
3265 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3266 | tmp_event[count].event.loglevel = uiter.loglevel; | |
3267 | tmp_event[count].event.type = LTTNG_UST_TRACEPOINT; | |
3268 | tmp_event[count].event.pid = app->pid; | |
3269 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3270 | count++; |
3271 | } | |
3272 | } | |
3273 | ||
3274 | ret = count; | |
c617c0c6 | 3275 | *fields = tmp_event; |
f37d259d MD |
3276 | |
3277 | DBG2("UST app list event fields done (%zu events)", count); | |
3278 | ||
3279 | rcu_error: | |
3280 | rcu_read_unlock(); | |
3281 | error: | |
840cb59c | 3282 | health_code_update(); |
f37d259d MD |
3283 | return ret; |
3284 | } | |
3285 | ||
5b4a0ec0 DG |
3286 | /* |
3287 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3288 | * |
3289 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3290 | */ |
3291 | void ust_app_clean_list(void) | |
421cb601 | 3292 | { |
5b4a0ec0 | 3293 | int ret; |
659ed79f | 3294 | struct ust_app *app; |
bec39940 | 3295 | struct lttng_ht_iter iter; |
421cb601 | 3296 | |
5b4a0ec0 | 3297 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3298 | |
5b4a0ec0 | 3299 | rcu_read_lock(); |
421cb601 | 3300 | |
659ed79f | 3301 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3302 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3303 | assert(!ret); |
659ed79f | 3304 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3305 | } |
3306 | ||
852d0037 | 3307 | /* Cleanup socket hash table */ |
659ed79f DG |
3308 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3309 | sock_n.node) { | |
852d0037 | 3310 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3311 | assert(!ret); |
3312 | } | |
852d0037 | 3313 | |
d88aee68 DG |
3314 | /* Cleanup notify socket hash table */ |
3315 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3316 | notify_sock_n.node) { | |
3317 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3318 | assert(!ret); | |
3319 | } | |
36b588ed | 3320 | rcu_read_unlock(); |
d88aee68 | 3321 | |
bec39940 | 3322 | /* Destroy is done only when the ht is empty */ |
0b2dc8df MD |
3323 | ht_cleanup_push(ust_app_ht); |
3324 | ht_cleanup_push(ust_app_ht_by_sock); | |
3325 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
5b4a0ec0 DG |
3326 | } |
3327 | ||
3328 | /* | |
3329 | * Init UST app hash table. | |
3330 | */ | |
3331 | void ust_app_ht_alloc(void) | |
3332 | { | |
bec39940 | 3333 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3334 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3335 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3336 | } |
3337 | ||
78f0bacd DG |
3338 | /* |
3339 | * For a specific UST session, disable the channel for all registered apps. | |
3340 | */ | |
35a9059d | 3341 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3342 | struct ltt_ust_channel *uchan) |
3343 | { | |
3344 | int ret = 0; | |
bec39940 DG |
3345 | struct lttng_ht_iter iter; |
3346 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3347 | struct ust_app *app; |
3348 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3349 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3350 | |
3351 | if (usess == NULL || uchan == NULL) { | |
3352 | ERR("Disabling UST global channel with NULL values"); | |
3353 | ret = -1; | |
3354 | goto error; | |
3355 | } | |
3356 | ||
d9bf3ca4 | 3357 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3358 | uchan->name, usess->id); |
78f0bacd DG |
3359 | |
3360 | rcu_read_lock(); | |
3361 | ||
3362 | /* For every registered applications */ | |
852d0037 | 3363 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3364 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3365 | if (!app->compatible) { |
3366 | /* | |
3367 | * TODO: In time, we should notice the caller of this error by | |
3368 | * telling him that this is a version error. | |
3369 | */ | |
3370 | continue; | |
3371 | } | |
78f0bacd DG |
3372 | ua_sess = lookup_session_by_app(usess, app); |
3373 | if (ua_sess == NULL) { | |
3374 | continue; | |
3375 | } | |
3376 | ||
8535a6d9 | 3377 | /* Get channel */ |
bec39940 DG |
3378 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3379 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3380 | /* If the session if found for the app, the channel must be there */ |
3381 | assert(ua_chan_node); | |
3382 | ||
3383 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3384 | /* The channel must not be already disabled */ | |
3385 | assert(ua_chan->enabled == 1); | |
3386 | ||
3387 | /* Disable channel onto application */ | |
3388 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3389 | if (ret < 0) { |
3390 | /* XXX: We might want to report this error at some point... */ | |
3391 | continue; | |
3392 | } | |
3393 | } | |
3394 | ||
3395 | rcu_read_unlock(); | |
3396 | ||
3397 | error: | |
3398 | return ret; | |
3399 | } | |
3400 | ||
3401 | /* | |
3402 | * For a specific UST session, enable the channel for all registered apps. | |
3403 | */ | |
35a9059d | 3404 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3405 | struct ltt_ust_channel *uchan) |
3406 | { | |
3407 | int ret = 0; | |
bec39940 | 3408 | struct lttng_ht_iter iter; |
78f0bacd DG |
3409 | struct ust_app *app; |
3410 | struct ust_app_session *ua_sess; | |
3411 | ||
3412 | if (usess == NULL || uchan == NULL) { | |
3413 | ERR("Adding UST global channel to NULL values"); | |
3414 | ret = -1; | |
3415 | goto error; | |
3416 | } | |
3417 | ||
d9bf3ca4 | 3418 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3419 | uchan->name, usess->id); |
78f0bacd DG |
3420 | |
3421 | rcu_read_lock(); | |
3422 | ||
3423 | /* For every registered applications */ | |
852d0037 | 3424 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3425 | if (!app->compatible) { |
3426 | /* | |
3427 | * TODO: In time, we should notice the caller of this error by | |
3428 | * telling him that this is a version error. | |
3429 | */ | |
3430 | continue; | |
3431 | } | |
78f0bacd DG |
3432 | ua_sess = lookup_session_by_app(usess, app); |
3433 | if (ua_sess == NULL) { | |
3434 | continue; | |
3435 | } | |
3436 | ||
3437 | /* Enable channel onto application */ | |
3438 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3439 | if (ret < 0) { | |
3440 | /* XXX: We might want to report this error at some point... */ | |
3441 | continue; | |
3442 | } | |
3443 | } | |
3444 | ||
3445 | rcu_read_unlock(); | |
3446 | ||
3447 | error: | |
3448 | return ret; | |
3449 | } | |
3450 | ||
b0a40d28 DG |
3451 | /* |
3452 | * Disable an event in a channel and for a specific session. | |
3453 | */ | |
35a9059d DG |
3454 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3455 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3456 | { |
3457 | int ret = 0; | |
bec39940 DG |
3458 | struct lttng_ht_iter iter, uiter; |
3459 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3460 | struct ust_app *app; |
3461 | struct ust_app_session *ua_sess; | |
3462 | struct ust_app_channel *ua_chan; | |
3463 | struct ust_app_event *ua_event; | |
3464 | ||
3465 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3466 | "%s for session id %" PRIu64, |
3467 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3468 | |
3469 | rcu_read_lock(); | |
3470 | ||
3471 | /* For all registered applications */ | |
852d0037 | 3472 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3473 | if (!app->compatible) { |
3474 | /* | |
3475 | * TODO: In time, we should notice the caller of this error by | |
3476 | * telling him that this is a version error. | |
3477 | */ | |
3478 | continue; | |
3479 | } | |
b0a40d28 DG |
3480 | ua_sess = lookup_session_by_app(usess, app); |
3481 | if (ua_sess == NULL) { | |
3482 | /* Next app */ | |
3483 | continue; | |
3484 | } | |
3485 | ||
3486 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3487 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3488 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3489 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3490 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3491 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3492 | continue; |
3493 | } | |
3494 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3495 | ||
bec39940 DG |
3496 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3497 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3498 | if (ua_event_node == NULL) { |
3499 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3500 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3501 | continue; |
3502 | } | |
3503 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3504 | ||
7f79d3a1 | 3505 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3506 | if (ret < 0) { |
3507 | /* XXX: Report error someday... */ | |
3508 | continue; | |
3509 | } | |
3510 | } | |
3511 | ||
3512 | rcu_read_unlock(); | |
3513 | ||
3514 | return ret; | |
3515 | } | |
3516 | ||
9730260e | 3517 | /* |
edb67388 | 3518 | * For a specific UST session and UST channel, the event for all |
9730260e DG |
3519 | * registered apps. |
3520 | */ | |
35a9059d | 3521 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
9730260e DG |
3522 | struct ltt_ust_channel *uchan) |
3523 | { | |
3524 | int ret = 0; | |
bec39940 DG |
3525 | struct lttng_ht_iter iter, uiter; |
3526 | struct lttng_ht_node_str *ua_chan_node; | |
9730260e DG |
3527 | struct ust_app *app; |
3528 | struct ust_app_session *ua_sess; | |
3529 | struct ust_app_channel *ua_chan; | |
3530 | struct ust_app_event *ua_event; | |
3531 | ||
3532 | DBG("UST app disabling all event for all apps in channel " | |
d9bf3ca4 | 3533 | "%s for session id %" PRIu64, uchan->name, usess->id); |
9730260e DG |
3534 | |
3535 | rcu_read_lock(); | |
3536 | ||
3537 | /* For all registered applications */ | |
852d0037 | 3538 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3539 | if (!app->compatible) { |
3540 | /* | |
3541 | * TODO: In time, we should notice the caller of this error by | |
3542 | * telling him that this is a version error. | |
3543 | */ | |
3544 | continue; | |
3545 | } | |
9730260e | 3546 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3547 | if (!ua_sess) { |
3548 | /* The application has problem or is probably dead. */ | |
3549 | continue; | |
3550 | } | |
9730260e DG |
3551 | |
3552 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3553 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3554 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3555 | /* If the channel is not found, there is a code flow error */ |
3556 | assert(ua_chan_node); | |
3557 | ||
9730260e DG |
3558 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3559 | ||
3560 | /* Disable each events of channel */ | |
bec39940 DG |
3561 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3562 | node.node) { | |
7f79d3a1 | 3563 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
9730260e DG |
3564 | if (ret < 0) { |
3565 | /* XXX: Report error someday... */ | |
3566 | continue; | |
3567 | } | |
3568 | } | |
3569 | } | |
3570 | ||
3571 | rcu_read_unlock(); | |
3572 | ||
3573 | return ret; | |
3574 | } | |
3575 | ||
421cb601 | 3576 | /* |
5b4a0ec0 | 3577 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3578 | */ |
35a9059d | 3579 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3580 | struct ltt_ust_channel *uchan) |
3581 | { | |
3d8ca23b | 3582 | int ret = 0, created; |
bec39940 | 3583 | struct lttng_ht_iter iter; |
48842b30 | 3584 | struct ust_app *app; |
3d8ca23b | 3585 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3586 | |
fc34caaa DG |
3587 | /* Very wrong code flow */ |
3588 | assert(usess); | |
3589 | assert(uchan); | |
421cb601 | 3590 | |
d9bf3ca4 | 3591 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3592 | uchan->name, usess->id); |
48842b30 DG |
3593 | |
3594 | rcu_read_lock(); | |
421cb601 | 3595 | |
5b4a0ec0 | 3596 | /* For every registered applications */ |
852d0037 | 3597 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3598 | if (!app->compatible) { |
3599 | /* | |
3600 | * TODO: In time, we should notice the caller of this error by | |
3601 | * telling him that this is a version error. | |
3602 | */ | |
3603 | continue; | |
3604 | } | |
edb67388 DG |
3605 | /* |
3606 | * Create session on the tracer side and add it to app session HT. Note | |
3607 | * that if session exist, it will simply return a pointer to the ust | |
3608 | * app session. | |
3609 | */ | |
3d8ca23b DG |
3610 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3611 | if (ret < 0) { | |
3612 | switch (ret) { | |
3613 | case -ENOTCONN: | |
3614 | /* | |
3615 | * The application's socket is not valid. Either a bad socket | |
3616 | * or a timeout on it. We can't inform the caller that for a | |
3617 | * specific app, the session failed so lets continue here. | |
3618 | */ | |
3619 | continue; | |
3620 | case -ENOMEM: | |
3621 | default: | |
3622 | goto error_rcu_unlock; | |
3623 | } | |
48842b30 | 3624 | } |
3d8ca23b | 3625 | assert(ua_sess); |
48842b30 | 3626 | |
d0b96690 | 3627 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3628 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3629 | sizeof(uchan->name))) { | |
3630 | struct ustctl_consumer_channel_attr attr; | |
3631 | copy_channel_attr_to_ustctl(&attr, &uchan->attr); | |
3632 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
3633 | &attr); | |
3634 | } else { | |
3635 | /* Create channel onto application. We don't need the chan ref. */ | |
3636 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3637 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3638 | } | |
d0b96690 | 3639 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3640 | if (ret < 0) { |
3641 | if (ret == -ENOMEM) { | |
3642 | /* No more memory is a fatal error. Stop right now. */ | |
3643 | goto error_rcu_unlock; | |
3644 | } | |
3645 | /* Cleanup the created session if it's the case. */ | |
3646 | if (created) { | |
d0b96690 | 3647 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3648 | } |
48842b30 | 3649 | } |
48842b30 | 3650 | } |
5b4a0ec0 | 3651 | |
95e047ff | 3652 | error_rcu_unlock: |
48842b30 | 3653 | rcu_read_unlock(); |
3c14c33f | 3654 | return ret; |
48842b30 DG |
3655 | } |
3656 | ||
5b4a0ec0 | 3657 | /* |
edb67388 | 3658 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3659 | */ |
35a9059d | 3660 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3661 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3662 | { | |
3663 | int ret = 0; | |
bec39940 | 3664 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3665 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3666 | struct ust_app *app; |
3667 | struct ust_app_session *ua_sess; | |
3668 | struct ust_app_channel *ua_chan; | |
3669 | struct ust_app_event *ua_event; | |
48842b30 | 3670 | |
d9bf3ca4 | 3671 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3672 | uevent->attr.name, usess->id); |
48842b30 | 3673 | |
edb67388 DG |
3674 | /* |
3675 | * NOTE: At this point, this function is called only if the session and | |
3676 | * channel passed are already created for all apps. and enabled on the | |
3677 | * tracer also. | |
3678 | */ | |
3679 | ||
48842b30 | 3680 | rcu_read_lock(); |
421cb601 DG |
3681 | |
3682 | /* For all registered applications */ | |
852d0037 | 3683 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3684 | if (!app->compatible) { |
3685 | /* | |
3686 | * TODO: In time, we should notice the caller of this error by | |
3687 | * telling him that this is a version error. | |
3688 | */ | |
3689 | continue; | |
3690 | } | |
edb67388 | 3691 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3692 | if (!ua_sess) { |
3693 | /* The application has problem or is probably dead. */ | |
3694 | continue; | |
3695 | } | |
ba767faf | 3696 | |
d0b96690 DG |
3697 | pthread_mutex_lock(&ua_sess->lock); |
3698 | ||
edb67388 | 3699 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3700 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3701 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3702 | /* If the channel is not found, there is a code flow error */ |
3703 | assert(ua_chan_node); | |
3704 | ||
3705 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3706 | ||
18eace3b DG |
3707 | /* Get event node */ |
3708 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 3709 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3710 | if (ua_event == NULL) { |
7f79d3a1 | 3711 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3712 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3713 | goto next_app; |
35a9059d | 3714 | } |
35a9059d DG |
3715 | |
3716 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3717 | if (ret < 0) { | |
d0b96690 | 3718 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3719 | goto error; |
48842b30 | 3720 | } |
d0b96690 DG |
3721 | next_app: |
3722 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3723 | } |
3724 | ||
7f79d3a1 | 3725 | error: |
edb67388 | 3726 | rcu_read_unlock(); |
edb67388 DG |
3727 | return ret; |
3728 | } | |
3729 | ||
3730 | /* | |
3731 | * For a specific existing UST session and UST channel, creates the event for | |
3732 | * all registered apps. | |
3733 | */ | |
35a9059d | 3734 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3735 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3736 | { | |
3737 | int ret = 0; | |
bec39940 DG |
3738 | struct lttng_ht_iter iter, uiter; |
3739 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3740 | struct ust_app *app; |
3741 | struct ust_app_session *ua_sess; | |
3742 | struct ust_app_channel *ua_chan; | |
3743 | ||
d9bf3ca4 | 3744 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3745 | uevent->attr.name, usess->id); |
edb67388 | 3746 | |
edb67388 DG |
3747 | rcu_read_lock(); |
3748 | ||
3749 | /* For all registered applications */ | |
852d0037 | 3750 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3751 | if (!app->compatible) { |
3752 | /* | |
3753 | * TODO: In time, we should notice the caller of this error by | |
3754 | * telling him that this is a version error. | |
3755 | */ | |
3756 | continue; | |
3757 | } | |
edb67388 | 3758 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3759 | if (!ua_sess) { |
3760 | /* The application has problem or is probably dead. */ | |
3761 | continue; | |
3762 | } | |
48842b30 | 3763 | |
d0b96690 | 3764 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3765 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3766 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3767 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3768 | /* If the channel is not found, there is a code flow error */ |
3769 | assert(ua_chan_node); | |
3770 | ||
48842b30 DG |
3771 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3772 | ||
edb67388 | 3773 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3774 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3775 | if (ret < 0) { |
49c336c1 | 3776 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3777 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3778 | break; | |
3779 | } | |
3780 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3781 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3782 | continue; |
48842b30 | 3783 | } |
48842b30 | 3784 | } |
5b4a0ec0 | 3785 | |
48842b30 DG |
3786 | rcu_read_unlock(); |
3787 | ||
3788 | return ret; | |
3789 | } | |
3790 | ||
5b4a0ec0 DG |
3791 | /* |
3792 | * Start tracing for a specific UST session and app. | |
3793 | */ | |
b34cbebf | 3794 | static |
421cb601 | 3795 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3796 | { |
3797 | int ret = 0; | |
48842b30 | 3798 | struct ust_app_session *ua_sess; |
48842b30 | 3799 | |
852d0037 | 3800 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3801 | |
509cbaf8 MD |
3802 | rcu_read_lock(); |
3803 | ||
e0c7ec2b DG |
3804 | if (!app->compatible) { |
3805 | goto end; | |
3806 | } | |
3807 | ||
421cb601 DG |
3808 | ua_sess = lookup_session_by_app(usess, app); |
3809 | if (ua_sess == NULL) { | |
d42f20df DG |
3810 | /* The session is in teardown process. Ignore and continue. */ |
3811 | goto end; | |
421cb601 | 3812 | } |
48842b30 | 3813 | |
d0b96690 DG |
3814 | pthread_mutex_lock(&ua_sess->lock); |
3815 | ||
aea829b3 DG |
3816 | /* Upon restart, we skip the setup, already done */ |
3817 | if (ua_sess->started) { | |
8be98f9a | 3818 | goto skip_setup; |
aea829b3 | 3819 | } |
8be98f9a | 3820 | |
a4b92340 DG |
3821 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3822 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3823 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3824 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3825 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3826 | if (ret < 0) { |
3827 | if (ret != -EEXIST) { | |
3828 | ERR("Trace directory creation error"); | |
d0b96690 | 3829 | goto error_unlock; |
421cb601 | 3830 | } |
173af62f | 3831 | } |
7753dea8 | 3832 | } |
aea829b3 | 3833 | |
d65d2de8 DG |
3834 | /* |
3835 | * Create the metadata for the application. This returns gracefully if a | |
3836 | * metadata was already set for the session. | |
3837 | */ | |
3838 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, NULL); | |
421cb601 | 3839 | if (ret < 0) { |
d0b96690 | 3840 | goto error_unlock; |
421cb601 | 3841 | } |
48842b30 | 3842 | |
840cb59c | 3843 | health_code_update(); |
86acf0da | 3844 | |
8be98f9a | 3845 | skip_setup: |
421cb601 | 3846 | /* This start the UST tracing */ |
852d0037 | 3847 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3848 | if (ret < 0) { |
ffe60014 DG |
3849 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3850 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3851 | app->pid, ret); | |
3852 | } else { | |
3853 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
3854 | /* |
3855 | * This is normal behavior, an application can die during the | |
3856 | * creation process. Don't report an error so the execution can | |
3857 | * continue normally. | |
3858 | */ | |
3859 | pthread_mutex_unlock(&ua_sess->lock); | |
3860 | goto end; | |
ffe60014 | 3861 | } |
d0b96690 | 3862 | goto error_unlock; |
421cb601 | 3863 | } |
5b4a0ec0 | 3864 | |
55c3953d DG |
3865 | /* Indicate that the session has been started once */ |
3866 | ua_sess->started = 1; | |
3867 | ||
d0b96690 DG |
3868 | pthread_mutex_unlock(&ua_sess->lock); |
3869 | ||
840cb59c | 3870 | health_code_update(); |
86acf0da | 3871 | |
421cb601 | 3872 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3873 | ret = ustctl_wait_quiescent(app->sock); |
3874 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3875 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3876 | app->pid, ret); | |
3877 | } | |
48842b30 | 3878 | |
e0c7ec2b DG |
3879 | end: |
3880 | rcu_read_unlock(); | |
840cb59c | 3881 | health_code_update(); |
421cb601 | 3882 | return 0; |
48842b30 | 3883 | |
d0b96690 DG |
3884 | error_unlock: |
3885 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3886 | rcu_read_unlock(); |
840cb59c | 3887 | health_code_update(); |
421cb601 DG |
3888 | return -1; |
3889 | } | |
48842b30 | 3890 | |
8be98f9a MD |
3891 | /* |
3892 | * Stop tracing for a specific UST session and app. | |
3893 | */ | |
b34cbebf | 3894 | static |
8be98f9a MD |
3895 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3896 | { | |
3897 | int ret = 0; | |
3898 | struct ust_app_session *ua_sess; | |
7972aab2 | 3899 | struct ust_registry_session *registry; |
8be98f9a | 3900 | |
852d0037 | 3901 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3902 | |
3903 | rcu_read_lock(); | |
3904 | ||
e0c7ec2b | 3905 | if (!app->compatible) { |
d88aee68 | 3906 | goto end_no_session; |
e0c7ec2b DG |
3907 | } |
3908 | ||
8be98f9a MD |
3909 | ua_sess = lookup_session_by_app(usess, app); |
3910 | if (ua_sess == NULL) { | |
d88aee68 | 3911 | goto end_no_session; |
8be98f9a MD |
3912 | } |
3913 | ||
d88aee68 DG |
3914 | pthread_mutex_lock(&ua_sess->lock); |
3915 | ||
9bc07046 DG |
3916 | /* |
3917 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3918 | * that was never started. It's possible since we can have a fail start |
3919 | * from either the application manager thread or the command thread. Simply | |
3920 | * indicate that this is a stop error. | |
9bc07046 | 3921 | */ |
f9dfc3d9 | 3922 | if (!ua_sess->started) { |
c45536e1 DG |
3923 | goto error_rcu_unlock; |
3924 | } | |
7db205b5 | 3925 | |
840cb59c | 3926 | health_code_update(); |
86acf0da | 3927 | |
9d6c7d3f | 3928 | /* This inhibits UST tracing */ |
852d0037 | 3929 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3930 | if (ret < 0) { |
ffe60014 DG |
3931 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3932 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3933 | app->pid, ret); | |
3934 | } else { | |
3935 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
3936 | /* |
3937 | * This is normal behavior, an application can die during the | |
3938 | * creation process. Don't report an error so the execution can | |
3939 | * continue normally. | |
3940 | */ | |
3941 | goto end_unlock; | |
ffe60014 | 3942 | } |
9d6c7d3f DG |
3943 | goto error_rcu_unlock; |
3944 | } | |
3945 | ||
840cb59c | 3946 | health_code_update(); |
86acf0da | 3947 | |
9d6c7d3f | 3948 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3949 | ret = ustctl_wait_quiescent(app->sock); |
3950 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3951 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3952 | app->pid, ret); | |
3953 | } | |
9d6c7d3f | 3954 | |
840cb59c | 3955 | health_code_update(); |
86acf0da | 3956 | |
b34cbebf MD |
3957 | registry = get_session_registry(ua_sess); |
3958 | assert(registry); | |
1b532a60 DG |
3959 | |
3960 | if (!registry->metadata_closed) { | |
3961 | /* Push metadata for application before freeing the application. */ | |
3962 | (void) push_metadata(registry, ua_sess->consumer); | |
3963 | } | |
b34cbebf | 3964 | |
3757b385 | 3965 | end_unlock: |
b34cbebf MD |
3966 | pthread_mutex_unlock(&ua_sess->lock); |
3967 | end_no_session: | |
3968 | rcu_read_unlock(); | |
3969 | health_code_update(); | |
3970 | return 0; | |
3971 | ||
3972 | error_rcu_unlock: | |
3973 | pthread_mutex_unlock(&ua_sess->lock); | |
3974 | rcu_read_unlock(); | |
3975 | health_code_update(); | |
3976 | return -1; | |
3977 | } | |
3978 | ||
3979 | /* | |
3980 | * Flush buffers for a specific UST session and app. | |
3981 | */ | |
3982 | static | |
3983 | int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
3984 | { | |
3985 | int ret = 0; | |
3986 | struct lttng_ht_iter iter; | |
3987 | struct ust_app_session *ua_sess; | |
3988 | struct ust_app_channel *ua_chan; | |
3989 | ||
3990 | DBG("Flushing buffers for ust app pid %d", app->pid); | |
3991 | ||
3992 | rcu_read_lock(); | |
3993 | ||
3994 | if (!app->compatible) { | |
3995 | goto end_no_session; | |
3996 | } | |
3997 | ||
3998 | ua_sess = lookup_session_by_app(usess, app); | |
3999 | if (ua_sess == NULL) { | |
4000 | goto end_no_session; | |
4001 | } | |
4002 | ||
4003 | pthread_mutex_lock(&ua_sess->lock); | |
4004 | ||
4005 | health_code_update(); | |
4006 | ||
9d6c7d3f | 4007 | /* Flushing buffers */ |
bec39940 DG |
4008 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4009 | node.node) { | |
840cb59c | 4010 | health_code_update(); |
ffe60014 | 4011 | assert(ua_chan->is_sent); |
852d0037 | 4012 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 4013 | if (ret < 0) { |
ffe60014 DG |
4014 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4015 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
4016 | app->pid, ua_chan->name, ret); | |
4017 | } else { | |
4018 | DBG3("UST app failed to flush %s. Application is dead.", | |
4019 | ua_chan->name); | |
3757b385 DG |
4020 | /* |
4021 | * This is normal behavior, an application can die during the | |
4022 | * creation process. Don't report an error so the execution can | |
4023 | * continue normally. | |
4024 | */ | |
ffe60014 | 4025 | } |
6d3686da DG |
4026 | /* Continuing flushing all buffers */ |
4027 | continue; | |
8be98f9a MD |
4028 | } |
4029 | } | |
8be98f9a | 4030 | |
840cb59c | 4031 | health_code_update(); |
86acf0da | 4032 | |
d88aee68 DG |
4033 | pthread_mutex_unlock(&ua_sess->lock); |
4034 | end_no_session: | |
7db205b5 | 4035 | rcu_read_unlock(); |
840cb59c | 4036 | health_code_update(); |
8be98f9a | 4037 | return 0; |
8be98f9a MD |
4038 | } |
4039 | ||
84cd17c6 MD |
4040 | /* |
4041 | * Destroy a specific UST session in apps. | |
4042 | */ | |
3353de95 | 4043 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4044 | { |
ffe60014 | 4045 | int ret; |
84cd17c6 | 4046 | struct ust_app_session *ua_sess; |
bec39940 | 4047 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4048 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4049 | |
852d0037 | 4050 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4051 | |
4052 | rcu_read_lock(); | |
4053 | ||
e0c7ec2b DG |
4054 | if (!app->compatible) { |
4055 | goto end; | |
4056 | } | |
4057 | ||
84cd17c6 | 4058 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4059 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4060 | if (node == NULL) { |
d42f20df DG |
4061 | /* Session is being or is deleted. */ |
4062 | goto end; | |
84cd17c6 MD |
4063 | } |
4064 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4065 | |
840cb59c | 4066 | health_code_update(); |
d0b96690 | 4067 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4068 | |
840cb59c | 4069 | health_code_update(); |
7db205b5 | 4070 | |
84cd17c6 | 4071 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4072 | ret = ustctl_wait_quiescent(app->sock); |
4073 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4074 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4075 | app->pid, ret); | |
4076 | } | |
e0c7ec2b DG |
4077 | end: |
4078 | rcu_read_unlock(); | |
840cb59c | 4079 | health_code_update(); |
84cd17c6 | 4080 | return 0; |
84cd17c6 MD |
4081 | } |
4082 | ||
5b4a0ec0 DG |
4083 | /* |
4084 | * Start tracing for the UST session. | |
4085 | */ | |
421cb601 DG |
4086 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4087 | { | |
4088 | int ret = 0; | |
bec39940 | 4089 | struct lttng_ht_iter iter; |
421cb601 | 4090 | struct ust_app *app; |
48842b30 | 4091 | |
421cb601 DG |
4092 | DBG("Starting all UST traces"); |
4093 | ||
4094 | rcu_read_lock(); | |
421cb601 | 4095 | |
852d0037 | 4096 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4097 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4098 | if (ret < 0) { |
5b4a0ec0 DG |
4099 | /* Continue to next apps even on error */ |
4100 | continue; | |
48842b30 | 4101 | } |
48842b30 | 4102 | } |
5b4a0ec0 | 4103 | |
48842b30 DG |
4104 | rcu_read_unlock(); |
4105 | ||
4106 | return 0; | |
4107 | } | |
487cf67c | 4108 | |
8be98f9a MD |
4109 | /* |
4110 | * Start tracing for the UST session. | |
4111 | */ | |
4112 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4113 | { | |
4114 | int ret = 0; | |
bec39940 | 4115 | struct lttng_ht_iter iter; |
8be98f9a MD |
4116 | struct ust_app *app; |
4117 | ||
4118 | DBG("Stopping all UST traces"); | |
4119 | ||
4120 | rcu_read_lock(); | |
4121 | ||
b34cbebf MD |
4122 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4123 | ret = ust_app_stop_trace(usess, app); | |
4124 | if (ret < 0) { | |
4125 | /* Continue to next apps even on error */ | |
4126 | continue; | |
4127 | } | |
4128 | } | |
4129 | ||
b0a5f0fb | 4130 | /* Flush buffers and push metadata (for UID buffers). */ |
b34cbebf MD |
4131 | switch (usess->buffer_type) { |
4132 | case LTTNG_BUFFER_PER_UID: | |
4133 | { | |
7972aab2 | 4134 | struct buffer_reg_uid *reg; |
b34cbebf MD |
4135 | |
4136 | /* Flush all per UID buffers associated to that session. */ | |
7972aab2 | 4137 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
b0a5f0fb | 4138 | struct ust_registry_session *ust_session_reg; |
7972aab2 DG |
4139 | struct buffer_reg_channel *reg_chan; |
4140 | struct consumer_socket *socket; | |
4141 | ||
4142 | /* Get consumer socket to use to push the metadata.*/ | |
4143 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4144 | usess->consumer); | |
4145 | if (!socket) { | |
4146 | /* Ignore request if no consumer is found for the session. */ | |
4147 | continue; | |
4148 | } | |
4149 | ||
4150 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4151 | reg_chan, node.node) { | |
4152 | /* | |
4153 | * The following call will print error values so the return | |
4154 | * code is of little importance because whatever happens, we | |
4155 | * have to try them all. | |
4156 | */ | |
4157 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4158 | } | |
b0a5f0fb MD |
4159 | |
4160 | ust_session_reg = reg->registry->reg.ust; | |
4161 | if (!ust_session_reg->metadata_closed) { | |
4162 | /* Push metadata. */ | |
4163 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4164 | } | |
7972aab2 | 4165 | } |
b0a5f0fb | 4166 | |
b34cbebf | 4167 | break; |
7972aab2 | 4168 | } |
b34cbebf MD |
4169 | case LTTNG_BUFFER_PER_PID: |
4170 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4171 | ret = ust_app_flush_trace(usess, app); | |
4172 | if (ret < 0) { | |
4173 | /* Continue to next apps even on error */ | |
4174 | continue; | |
4175 | } | |
8be98f9a | 4176 | } |
b34cbebf MD |
4177 | break; |
4178 | default: | |
4179 | assert(0); | |
4180 | break; | |
8be98f9a MD |
4181 | } |
4182 | ||
4183 | rcu_read_unlock(); | |
4184 | ||
4185 | return 0; | |
4186 | } | |
4187 | ||
84cd17c6 MD |
4188 | /* |
4189 | * Destroy app UST session. | |
4190 | */ | |
4191 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4192 | { | |
4193 | int ret = 0; | |
bec39940 | 4194 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4195 | struct ust_app *app; |
4196 | ||
4197 | DBG("Destroy all UST traces"); | |
4198 | ||
4199 | rcu_read_lock(); | |
4200 | ||
852d0037 | 4201 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4202 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4203 | if (ret < 0) { |
4204 | /* Continue to next apps even on error */ | |
4205 | continue; | |
4206 | } | |
4207 | } | |
4208 | ||
4209 | rcu_read_unlock(); | |
4210 | ||
4211 | return 0; | |
4212 | } | |
4213 | ||
5b4a0ec0 DG |
4214 | /* |
4215 | * Add channels/events from UST global domain to registered apps at sock. | |
4216 | */ | |
487cf67c DG |
4217 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4218 | { | |
55c54cce | 4219 | int ret = 0; |
31746f93 | 4220 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4221 | struct ust_app *app; |
3d8ca23b | 4222 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4223 | struct ust_app_channel *ua_chan; |
4224 | struct ust_app_event *ua_event; | |
727d5404 | 4225 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4226 | |
95e047ff | 4227 | assert(usess); |
ffe60014 | 4228 | assert(sock >= 0); |
1f3580c7 | 4229 | |
d9bf3ca4 | 4230 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4231 | usess->id); |
487cf67c | 4232 | |
284d8f55 DG |
4233 | rcu_read_lock(); |
4234 | ||
f20baf8e | 4235 | app = ust_app_find_by_sock(sock); |
487cf67c | 4236 | if (app == NULL) { |
d88aee68 DG |
4237 | /* |
4238 | * Application can be unregistered before so this is possible hence | |
4239 | * simply stopping the update. | |
4240 | */ | |
4241 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4242 | goto error; |
4243 | } | |
4244 | ||
e0c7ec2b DG |
4245 | if (!app->compatible) { |
4246 | goto error; | |
4247 | } | |
4248 | ||
3d8ca23b DG |
4249 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4250 | if (ret < 0) { | |
4251 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4252 | goto error; |
4253 | } | |
3d8ca23b | 4254 | assert(ua_sess); |
487cf67c | 4255 | |
d0b96690 DG |
4256 | pthread_mutex_lock(&ua_sess->lock); |
4257 | ||
284d8f55 | 4258 | /* |
d0b96690 | 4259 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4260 | * app session above made a shadow copy of the UST global domain from the |
4261 | * ltt ust session. | |
4262 | */ | |
bec39940 DG |
4263 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4264 | node.node) { | |
d65d2de8 DG |
4265 | /* |
4266 | * For a metadata channel, handle it differently. | |
4267 | */ | |
4268 | if (!strncmp(ua_chan->name, DEFAULT_METADATA_NAME, | |
4269 | sizeof(ua_chan->name))) { | |
4270 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
4271 | &ua_chan->attr); | |
c7a339aa DG |
4272 | if (ret < 0) { |
4273 | goto error_unlock; | |
4274 | } | |
d65d2de8 DG |
4275 | /* Remove it from the hash table and continue!. */ |
4276 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
4277 | assert(!ret); | |
4278 | delete_ust_app_channel(-1, ua_chan, app); | |
4279 | continue; | |
4280 | } else { | |
4281 | ret = do_create_channel(app, usess, ua_sess, ua_chan); | |
c7a339aa DG |
4282 | if (ret < 0) { |
4283 | /* | |
4284 | * Stop everything. On error, the application failed, no more | |
4285 | * file descriptor are available or ENOMEM so stopping here is | |
4286 | * the only thing we can do for now. | |
4287 | */ | |
4288 | goto error_unlock; | |
4289 | } | |
487cf67c DG |
4290 | } |
4291 | ||
31746f93 DG |
4292 | /* |
4293 | * Add context using the list so they are enabled in the same order the | |
4294 | * user added them. | |
4295 | */ | |
4296 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4297 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4298 | if (ret < 0) { | |
d0b96690 | 4299 | goto error_unlock; |
727d5404 DG |
4300 | } |
4301 | } | |
4302 | ||
4303 | ||
284d8f55 | 4304 | /* For each events */ |
bec39940 DG |
4305 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4306 | node.node) { | |
284d8f55 DG |
4307 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4308 | if (ret < 0) { | |
d0b96690 | 4309 | goto error_unlock; |
487cf67c | 4310 | } |
36dc12cc | 4311 | } |
487cf67c DG |
4312 | } |
4313 | ||
d0b96690 DG |
4314 | pthread_mutex_unlock(&ua_sess->lock); |
4315 | ||
36dc12cc | 4316 | if (usess->start_trace) { |
421cb601 | 4317 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4318 | if (ret < 0) { |
36dc12cc DG |
4319 | goto error; |
4320 | } | |
4321 | ||
852d0037 | 4322 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4323 | } |
4324 | ||
ffe60014 DG |
4325 | /* Everything went well at this point. */ |
4326 | rcu_read_unlock(); | |
4327 | return; | |
4328 | ||
d0b96690 DG |
4329 | error_unlock: |
4330 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4331 | error: |
ffe60014 | 4332 | if (ua_sess) { |
d0b96690 | 4333 | destroy_app_session(app, ua_sess); |
ffe60014 | 4334 | } |
487cf67c DG |
4335 | rcu_read_unlock(); |
4336 | return; | |
4337 | } | |
55cc08a6 DG |
4338 | |
4339 | /* | |
4340 | * Add context to a specific channel for global UST domain. | |
4341 | */ | |
4342 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4343 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4344 | { | |
4345 | int ret = 0; | |
bec39940 DG |
4346 | struct lttng_ht_node_str *ua_chan_node; |
4347 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4348 | struct ust_app_channel *ua_chan = NULL; |
4349 | struct ust_app_session *ua_sess; | |
4350 | struct ust_app *app; | |
4351 | ||
4352 | rcu_read_lock(); | |
4353 | ||
852d0037 | 4354 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4355 | if (!app->compatible) { |
4356 | /* | |
4357 | * TODO: In time, we should notice the caller of this error by | |
4358 | * telling him that this is a version error. | |
4359 | */ | |
4360 | continue; | |
4361 | } | |
55cc08a6 DG |
4362 | ua_sess = lookup_session_by_app(usess, app); |
4363 | if (ua_sess == NULL) { | |
4364 | continue; | |
4365 | } | |
4366 | ||
d0b96690 | 4367 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4368 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4369 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4370 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4371 | if (ua_chan_node == NULL) { |
d0b96690 | 4372 | goto next_app; |
55cc08a6 DG |
4373 | } |
4374 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4375 | node); | |
55cc08a6 DG |
4376 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4377 | if (ret < 0) { | |
d0b96690 | 4378 | goto next_app; |
55cc08a6 | 4379 | } |
d0b96690 DG |
4380 | next_app: |
4381 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4382 | } |
4383 | ||
55cc08a6 DG |
4384 | rcu_read_unlock(); |
4385 | return ret; | |
4386 | } | |
4387 | ||
76d45b40 DG |
4388 | /* |
4389 | * Enable event for a channel from a UST session for a specific PID. | |
4390 | */ | |
4391 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4392 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4393 | { | |
4394 | int ret = 0; | |
bec39940 | 4395 | struct lttng_ht_iter iter; |
18eace3b | 4396 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4397 | struct ust_app *app; |
4398 | struct ust_app_session *ua_sess; | |
4399 | struct ust_app_channel *ua_chan; | |
4400 | struct ust_app_event *ua_event; | |
4401 | ||
4402 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4403 | ||
4404 | rcu_read_lock(); | |
4405 | ||
4406 | app = ust_app_find_by_pid(pid); | |
4407 | if (app == NULL) { | |
4408 | ERR("UST app enable event per PID %d not found", pid); | |
4409 | ret = -1; | |
d0b96690 | 4410 | goto end; |
76d45b40 DG |
4411 | } |
4412 | ||
e0c7ec2b DG |
4413 | if (!app->compatible) { |
4414 | ret = 0; | |
d0b96690 | 4415 | goto end; |
e0c7ec2b DG |
4416 | } |
4417 | ||
76d45b40 | 4418 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4419 | if (!ua_sess) { |
4420 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4421 | ret = 0; |
4422 | goto end; | |
c4a1715b | 4423 | } |
76d45b40 | 4424 | |
d0b96690 | 4425 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4426 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4427 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4428 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4429 | /* If the channel is not found, there is a code flow error */ |
4430 | assert(ua_chan_node); | |
4431 | ||
4432 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4433 | ||
18eace3b | 4434 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 4435 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4436 | if (ua_event == NULL) { |
76d45b40 DG |
4437 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4438 | if (ret < 0) { | |
d0b96690 | 4439 | goto end_unlock; |
76d45b40 DG |
4440 | } |
4441 | } else { | |
76d45b40 DG |
4442 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4443 | if (ret < 0) { | |
d0b96690 | 4444 | goto end_unlock; |
76d45b40 DG |
4445 | } |
4446 | } | |
4447 | ||
d0b96690 DG |
4448 | end_unlock: |
4449 | pthread_mutex_unlock(&ua_sess->lock); | |
4450 | end: | |
76d45b40 DG |
4451 | rcu_read_unlock(); |
4452 | return ret; | |
4453 | } | |
7f79d3a1 DG |
4454 | |
4455 | /* | |
4456 | * Disable event for a channel from a UST session for a specific PID. | |
4457 | */ | |
4458 | int ust_app_disable_event_pid(struct ltt_ust_session *usess, | |
4459 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4460 | { | |
4461 | int ret = 0; | |
bec39940 DG |
4462 | struct lttng_ht_iter iter; |
4463 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
7f79d3a1 DG |
4464 | struct ust_app *app; |
4465 | struct ust_app_session *ua_sess; | |
4466 | struct ust_app_channel *ua_chan; | |
4467 | struct ust_app_event *ua_event; | |
4468 | ||
4469 | DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); | |
4470 | ||
4471 | rcu_read_lock(); | |
4472 | ||
4473 | app = ust_app_find_by_pid(pid); | |
4474 | if (app == NULL) { | |
4475 | ERR("UST app disable event per PID %d not found", pid); | |
4476 | ret = -1; | |
4477 | goto error; | |
4478 | } | |
4479 | ||
e0c7ec2b DG |
4480 | if (!app->compatible) { |
4481 | ret = 0; | |
4482 | goto error; | |
4483 | } | |
4484 | ||
7f79d3a1 | 4485 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4486 | if (!ua_sess) { |
4487 | /* The application has problem or is probably dead. */ | |
4488 | goto error; | |
4489 | } | |
7f79d3a1 DG |
4490 | |
4491 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4492 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4493 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4494 | if (ua_chan_node == NULL) { |
4495 | /* Channel does not exist, skip disabling */ | |
4496 | goto error; | |
4497 | } | |
4498 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4499 | ||
bec39940 DG |
4500 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); |
4501 | ua_event_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4502 | if (ua_event_node == NULL) { |
4503 | /* Event does not exist, skip disabling */ | |
4504 | goto error; | |
4505 | } | |
4506 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
4507 | ||
4508 | ret = disable_ust_app_event(ua_sess, ua_event, app); | |
4509 | if (ret < 0) { | |
4510 | goto error; | |
4511 | } | |
4512 | ||
4513 | error: | |
4514 | rcu_read_unlock(); | |
4515 | return ret; | |
4516 | } | |
e0c7ec2b | 4517 | |
4466912f DG |
4518 | /* |
4519 | * Calibrate registered applications. | |
4520 | */ | |
4521 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4522 | { | |
4523 | int ret = 0; | |
4524 | struct lttng_ht_iter iter; | |
4525 | struct ust_app *app; | |
4526 | ||
4527 | rcu_read_lock(); | |
4528 | ||
852d0037 | 4529 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4530 | if (!app->compatible) { |
4531 | /* | |
4532 | * TODO: In time, we should notice the caller of this error by | |
4533 | * telling him that this is a version error. | |
4534 | */ | |
4535 | continue; | |
4536 | } | |
4537 | ||
840cb59c | 4538 | health_code_update(); |
86acf0da | 4539 | |
852d0037 | 4540 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4541 | if (ret < 0) { |
4542 | switch (ret) { | |
4543 | case -ENOSYS: | |
4544 | /* Means that it's not implemented on the tracer side. */ | |
4545 | ret = 0; | |
4546 | break; | |
4547 | default: | |
4466912f | 4548 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4549 | app->pid, ret); |
4466912f DG |
4550 | break; |
4551 | } | |
4552 | } | |
4553 | } | |
4554 | ||
4555 | DBG("UST app global domain calibration finished"); | |
4556 | ||
4557 | rcu_read_unlock(); | |
4558 | ||
840cb59c | 4559 | health_code_update(); |
86acf0da | 4560 | |
4466912f DG |
4561 | return ret; |
4562 | } | |
d0b96690 DG |
4563 | |
4564 | /* | |
4565 | * Receive registration and populate the given msg structure. | |
4566 | * | |
4567 | * On success return 0 else a negative value returned by the ustctl call. | |
4568 | */ | |
4569 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4570 | { | |
4571 | int ret; | |
4572 | uint32_t pid, ppid, uid, gid; | |
4573 | ||
4574 | assert(msg); | |
4575 | ||
4576 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4577 | &pid, &ppid, &uid, &gid, | |
4578 | &msg->bits_per_long, | |
4579 | &msg->uint8_t_alignment, | |
4580 | &msg->uint16_t_alignment, | |
4581 | &msg->uint32_t_alignment, | |
4582 | &msg->uint64_t_alignment, | |
4583 | &msg->long_alignment, | |
4584 | &msg->byte_order, | |
4585 | msg->name); | |
4586 | if (ret < 0) { | |
4587 | switch (-ret) { | |
4588 | case EPIPE: | |
4589 | case ECONNRESET: | |
4590 | case LTTNG_UST_ERR_EXITING: | |
4591 | DBG3("UST app recv reg message failed. Application died"); | |
4592 | break; | |
4593 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4594 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4595 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4596 | LTTNG_UST_ABI_MINOR_VERSION); | |
4597 | break; | |
4598 | default: | |
4599 | ERR("UST app recv reg message failed with ret %d", ret); | |
4600 | break; | |
4601 | } | |
4602 | goto error; | |
4603 | } | |
4604 | msg->pid = (pid_t) pid; | |
4605 | msg->ppid = (pid_t) ppid; | |
4606 | msg->uid = (uid_t) uid; | |
4607 | msg->gid = (gid_t) gid; | |
4608 | ||
4609 | error: | |
4610 | return ret; | |
4611 | } | |
4612 | ||
d88aee68 DG |
4613 | /* |
4614 | * Return a ust app channel object using the application object and the channel | |
4615 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4616 | * lock MUST be acquired before calling this function. | |
4617 | */ | |
d0b96690 DG |
4618 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4619 | int objd) | |
4620 | { | |
4621 | struct lttng_ht_node_ulong *node; | |
4622 | struct lttng_ht_iter iter; | |
4623 | struct ust_app_channel *ua_chan = NULL; | |
4624 | ||
4625 | assert(app); | |
4626 | ||
4627 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4628 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4629 | if (node == NULL) { | |
4630 | DBG2("UST app channel find by objd %d not found", objd); | |
4631 | goto error; | |
4632 | } | |
4633 | ||
4634 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4635 | ||
4636 | error: | |
4637 | return ua_chan; | |
4638 | } | |
4639 | ||
d88aee68 DG |
4640 | /* |
4641 | * Reply to a register channel notification from an application on the notify | |
4642 | * socket. The channel metadata is also created. | |
4643 | * | |
4644 | * The session UST registry lock is acquired in this function. | |
4645 | * | |
4646 | * On success 0 is returned else a negative value. | |
4647 | */ | |
d0b96690 DG |
4648 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4649 | size_t nr_fields, struct ustctl_field *fields) | |
4650 | { | |
4651 | int ret, ret_code = 0; | |
4652 | uint32_t chan_id, reg_count; | |
7972aab2 | 4653 | uint64_t chan_reg_key; |
d0b96690 DG |
4654 | enum ustctl_channel_header type; |
4655 | struct ust_app *app; | |
4656 | struct ust_app_channel *ua_chan; | |
4657 | struct ust_app_session *ua_sess; | |
7972aab2 | 4658 | struct ust_registry_session *registry; |
45893984 | 4659 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4660 | |
4661 | rcu_read_lock(); | |
4662 | ||
4663 | /* Lookup application. If not found, there is a code flow error. */ | |
4664 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4665 | if (!app) { |
4666 | DBG("Application socket %d is being teardown. Abort event notify", | |
4667 | sock); | |
4668 | ret = 0; | |
d5d629b5 | 4669 | free(fields); |
d88aee68 DG |
4670 | goto error_rcu_unlock; |
4671 | } | |
d0b96690 | 4672 | |
4950b860 | 4673 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4674 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4675 | if (!ua_chan) { |
4676 | DBG("Application channel is being teardown. Abort event notify"); | |
4677 | ret = 0; | |
d5d629b5 | 4678 | free(fields); |
4950b860 MD |
4679 | goto error_rcu_unlock; |
4680 | } | |
4681 | ||
d0b96690 DG |
4682 | assert(ua_chan->session); |
4683 | ua_sess = ua_chan->session; | |
d0b96690 | 4684 | |
7972aab2 DG |
4685 | /* Get right session registry depending on the session buffer type. */ |
4686 | registry = get_session_registry(ua_sess); | |
4687 | assert(registry); | |
45893984 | 4688 | |
7972aab2 DG |
4689 | /* Depending on the buffer type, a different channel key is used. */ |
4690 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4691 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4692 | } else { |
7972aab2 | 4693 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4694 | } |
4695 | ||
7972aab2 DG |
4696 | pthread_mutex_lock(®istry->lock); |
4697 | ||
4698 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4699 | assert(chan_reg); | |
4700 | ||
4701 | if (!chan_reg->register_done) { | |
4702 | reg_count = ust_registry_get_event_count(chan_reg); | |
4703 | if (reg_count < 31) { | |
4704 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4705 | } else { | |
4706 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4707 | } | |
4708 | ||
4709 | chan_reg->nr_ctx_fields = nr_fields; | |
4710 | chan_reg->ctx_fields = fields; | |
4711 | chan_reg->header_type = type; | |
d0b96690 | 4712 | } else { |
7972aab2 DG |
4713 | /* Get current already assigned values. */ |
4714 | type = chan_reg->header_type; | |
d5d629b5 DG |
4715 | free(fields); |
4716 | /* Set to NULL so the error path does not do a double free. */ | |
4717 | fields = NULL; | |
d0b96690 | 4718 | } |
7972aab2 DG |
4719 | /* Channel id is set during the object creation. */ |
4720 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4721 | |
4722 | /* Append to metadata */ | |
7972aab2 DG |
4723 | if (!chan_reg->metadata_dumped) { |
4724 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4725 | if (ret_code) { |
4726 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4727 | goto reply; | |
4728 | } | |
4729 | } | |
4730 | ||
4731 | reply: | |
7972aab2 DG |
4732 | DBG3("UST app replying to register channel key %" PRIu64 |
4733 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4734 | ret_code); | |
d0b96690 DG |
4735 | |
4736 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4737 | if (ret < 0) { | |
4738 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4739 | ERR("UST app reply channel failed with ret %d", ret); | |
4740 | } else { | |
4741 | DBG3("UST app reply channel failed. Application died"); | |
4742 | } | |
4743 | goto error; | |
4744 | } | |
4745 | ||
7972aab2 DG |
4746 | /* This channel registry registration is completed. */ |
4747 | chan_reg->register_done = 1; | |
4748 | ||
d0b96690 | 4749 | error: |
7972aab2 | 4750 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4751 | error_rcu_unlock: |
d0b96690 | 4752 | rcu_read_unlock(); |
d5d629b5 DG |
4753 | if (ret) { |
4754 | free(fields); | |
4755 | } | |
d0b96690 DG |
4756 | return ret; |
4757 | } | |
4758 | ||
d88aee68 DG |
4759 | /* |
4760 | * Add event to the UST channel registry. When the event is added to the | |
4761 | * registry, the metadata is also created. Once done, this replies to the | |
4762 | * application with the appropriate error code. | |
4763 | * | |
4764 | * The session UST registry lock is acquired in the function. | |
4765 | * | |
4766 | * On success 0 is returned else a negative value. | |
4767 | */ | |
d0b96690 DG |
4768 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4769 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4770 | char *model_emf_uri) | |
4771 | { | |
4772 | int ret, ret_code; | |
4773 | uint32_t event_id = 0; | |
7972aab2 | 4774 | uint64_t chan_reg_key; |
d0b96690 DG |
4775 | struct ust_app *app; |
4776 | struct ust_app_channel *ua_chan; | |
4777 | struct ust_app_session *ua_sess; | |
7972aab2 | 4778 | struct ust_registry_session *registry; |
d0b96690 DG |
4779 | |
4780 | rcu_read_lock(); | |
4781 | ||
4782 | /* Lookup application. If not found, there is a code flow error. */ | |
4783 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4784 | if (!app) { |
4785 | DBG("Application socket %d is being teardown. Abort event notify", | |
4786 | sock); | |
4787 | ret = 0; | |
d5d629b5 DG |
4788 | free(sig); |
4789 | free(fields); | |
4790 | free(model_emf_uri); | |
d88aee68 DG |
4791 | goto error_rcu_unlock; |
4792 | } | |
d0b96690 | 4793 | |
4950b860 | 4794 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4795 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4796 | if (!ua_chan) { |
4797 | DBG("Application channel is being teardown. Abort event notify"); | |
4798 | ret = 0; | |
d5d629b5 DG |
4799 | free(sig); |
4800 | free(fields); | |
4801 | free(model_emf_uri); | |
4950b860 MD |
4802 | goto error_rcu_unlock; |
4803 | } | |
4804 | ||
d0b96690 DG |
4805 | assert(ua_chan->session); |
4806 | ua_sess = ua_chan->session; | |
4807 | ||
7972aab2 DG |
4808 | registry = get_session_registry(ua_sess); |
4809 | assert(registry); | |
4810 | ||
4811 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4812 | chan_reg_key = ua_chan->tracing_channel_id; | |
4813 | } else { | |
4814 | chan_reg_key = ua_chan->key; | |
4815 | } | |
4816 | ||
4817 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4818 | |
d5d629b5 DG |
4819 | /* |
4820 | * From this point on, this call acquires the ownership of the sig, fields | |
4821 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4822 | * three variables MUST NOT be read/write after this. | |
4823 | */ | |
7972aab2 | 4824 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4825 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
8494bda5 MD |
4826 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4827 | app); | |
d0b96690 DG |
4828 | |
4829 | /* | |
4830 | * The return value is returned to ustctl so in case of an error, the | |
4831 | * application can be notified. In case of an error, it's important not to | |
4832 | * return a negative error or else the application will get closed. | |
4833 | */ | |
4834 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4835 | if (ret < 0) { | |
4836 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4837 | ERR("UST app reply event failed with ret %d", ret); | |
4838 | } else { | |
4839 | DBG3("UST app reply event failed. Application died"); | |
4840 | } | |
4841 | /* | |
4842 | * No need to wipe the create event since the application socket will | |
4843 | * get close on error hence cleaning up everything by itself. | |
4844 | */ | |
4845 | goto error; | |
4846 | } | |
4847 | ||
7972aab2 DG |
4848 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4849 | name, event_id); | |
d88aee68 | 4850 | |
d0b96690 | 4851 | error: |
7972aab2 | 4852 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4853 | error_rcu_unlock: |
d0b96690 DG |
4854 | rcu_read_unlock(); |
4855 | return ret; | |
4856 | } | |
4857 | ||
d88aee68 DG |
4858 | /* |
4859 | * Handle application notification through the given notify socket. | |
4860 | * | |
4861 | * Return 0 on success or else a negative value. | |
4862 | */ | |
d0b96690 DG |
4863 | int ust_app_recv_notify(int sock) |
4864 | { | |
4865 | int ret; | |
4866 | enum ustctl_notify_cmd cmd; | |
4867 | ||
4868 | DBG3("UST app receiving notify from sock %d", sock); | |
4869 | ||
4870 | ret = ustctl_recv_notify(sock, &cmd); | |
4871 | if (ret < 0) { | |
4872 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4873 | ERR("UST app recv notify failed with ret %d", ret); | |
4874 | } else { | |
4875 | DBG3("UST app recv notify failed. Application died"); | |
4876 | } | |
4877 | goto error; | |
4878 | } | |
4879 | ||
4880 | switch (cmd) { | |
4881 | case USTCTL_NOTIFY_CMD_EVENT: | |
4882 | { | |
4883 | int sobjd, cobjd, loglevel; | |
4884 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4885 | size_t nr_fields; | |
4886 | struct ustctl_field *fields; | |
4887 | ||
4888 | DBG2("UST app ustctl register event received"); | |
4889 | ||
4890 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4891 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4892 | if (ret < 0) { | |
4893 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4894 | ERR("UST app recv event failed with ret %d", ret); | |
4895 | } else { | |
4896 | DBG3("UST app recv event failed. Application died"); | |
4897 | } | |
4898 | goto error; | |
4899 | } | |
4900 | ||
d5d629b5 DG |
4901 | /* |
4902 | * Add event to the UST registry coming from the notify socket. This | |
4903 | * call will free if needed the sig, fields and model_emf_uri. This | |
4904 | * code path loses the ownsership of these variables and transfer them | |
4905 | * to the this function. | |
4906 | */ | |
d0b96690 DG |
4907 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4908 | fields, loglevel, model_emf_uri); | |
4909 | if (ret < 0) { | |
4910 | goto error; | |
4911 | } | |
4912 | ||
4913 | break; | |
4914 | } | |
4915 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4916 | { | |
4917 | int sobjd, cobjd; | |
4918 | size_t nr_fields; | |
4919 | struct ustctl_field *fields; | |
4920 | ||
4921 | DBG2("UST app ustctl register channel received"); | |
4922 | ||
4923 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4924 | &fields); | |
4925 | if (ret < 0) { | |
4926 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4927 | ERR("UST app recv channel failed with ret %d", ret); | |
4928 | } else { | |
4929 | DBG3("UST app recv channel failed. Application died"); | |
4930 | } | |
4931 | goto error; | |
4932 | } | |
4933 | ||
d5d629b5 DG |
4934 | /* |
4935 | * The fields ownership are transfered to this function call meaning | |
4936 | * that if needed it will be freed. After this, it's invalid to access | |
4937 | * fields or clean it up. | |
4938 | */ | |
d0b96690 DG |
4939 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4940 | fields); | |
4941 | if (ret < 0) { | |
4942 | goto error; | |
4943 | } | |
4944 | ||
4945 | break; | |
4946 | } | |
4947 | default: | |
4948 | /* Should NEVER happen. */ | |
4949 | assert(0); | |
4950 | } | |
4951 | ||
4952 | error: | |
4953 | return ret; | |
4954 | } | |
d88aee68 DG |
4955 | |
4956 | /* | |
4957 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4958 | * corresponding application. On failure, the call_rcu to close the socket is | |
4959 | * executed. If an application is found, it tries to delete it from the notify | |
4960 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4961 | * | |
4962 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4963 | * call RCU is not done but the rest of the cleanup is. | |
4964 | */ | |
4965 | void ust_app_notify_sock_unregister(int sock) | |
4966 | { | |
4967 | int err_enomem = 0; | |
4968 | struct lttng_ht_iter iter; | |
4969 | struct ust_app *app; | |
4970 | struct ust_app_notify_sock_obj *obj; | |
4971 | ||
4972 | assert(sock >= 0); | |
4973 | ||
4974 | rcu_read_lock(); | |
4975 | ||
4976 | obj = zmalloc(sizeof(*obj)); | |
4977 | if (!obj) { | |
4978 | /* | |
4979 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4980 | * procedure but the call_rcu will not be called. In this case, we | |
4981 | * accept the fd leak rather than possibly creating an unsynchronized | |
4982 | * state between threads. | |
4983 | * | |
4984 | * TODO: The notify object should be created once the notify socket is | |
4985 | * registered and stored independantely from the ust app object. The | |
4986 | * tricky part is to synchronize the teardown of the application and | |
4987 | * this notify object. Let's keep that in mind so we can avoid this | |
4988 | * kind of shenanigans with ENOMEM in the teardown path. | |
4989 | */ | |
4990 | err_enomem = 1; | |
4991 | } else { | |
4992 | obj->fd = sock; | |
4993 | } | |
4994 | ||
4995 | DBG("UST app notify socket unregister %d", sock); | |
4996 | ||
4997 | /* | |
4998 | * Lookup application by notify socket. If this fails, this means that the | |
4999 | * hash table delete has already been done by the application | |
5000 | * unregistration process so we can safely close the notify socket in a | |
5001 | * call RCU. | |
5002 | */ | |
5003 | app = find_app_by_notify_sock(sock); | |
5004 | if (!app) { | |
5005 | goto close_socket; | |
5006 | } | |
5007 | ||
5008 | iter.iter.node = &app->notify_sock_n.node; | |
5009 | ||
5010 | /* | |
5011 | * Whatever happens here either we fail or succeed, in both cases we have | |
5012 | * to close the socket after a grace period to continue to the call RCU | |
5013 | * here. If the deletion is successful, the application is not visible | |
5014 | * anymore by other threads and is it fails it means that it was already | |
5015 | * deleted from the hash table so either way we just have to close the | |
5016 | * socket. | |
5017 | */ | |
5018 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5019 | ||
5020 | close_socket: | |
5021 | rcu_read_unlock(); | |
5022 | ||
5023 | /* | |
5024 | * Close socket after a grace period to avoid for the socket to be reused | |
5025 | * before the application object is freed creating potential race between | |
5026 | * threads trying to add unique in the global hash table. | |
5027 | */ | |
5028 | if (!err_enomem) { | |
5029 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5030 | } | |
5031 | } | |
f45e313d DG |
5032 | |
5033 | /* | |
5034 | * Destroy a ust app data structure and free its memory. | |
5035 | */ | |
5036 | void ust_app_destroy(struct ust_app *app) | |
5037 | { | |
5038 | if (!app) { | |
5039 | return; | |
5040 | } | |
5041 | ||
5042 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5043 | } | |
6dc3064a DG |
5044 | |
5045 | /* | |
5046 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5047 | * output. | |
5048 | * | |
5049 | * Return 0 on success or else a negative value. | |
5050 | */ | |
5051 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
5c786ded | 5052 | struct snapshot_output *output, int wait, unsigned int nb_streams) |
6dc3064a DG |
5053 | { |
5054 | int ret = 0; | |
5055 | struct lttng_ht_iter iter; | |
5056 | struct ust_app *app; | |
af706bb7 | 5057 | char pathname[PATH_MAX]; |
5c786ded | 5058 | uint64_t max_stream_size = 0; |
6dc3064a DG |
5059 | |
5060 | assert(usess); | |
5061 | assert(output); | |
5062 | ||
5063 | rcu_read_lock(); | |
5064 | ||
5c786ded JD |
5065 | /* |
5066 | * Compute the maximum size of a single stream if a max size is asked by | |
5067 | * the caller. | |
5068 | */ | |
5069 | if (output->max_size > 0 && nb_streams > 0) { | |
5070 | max_stream_size = output->max_size / nb_streams; | |
5071 | } | |
5072 | ||
8c924c7b MD |
5073 | switch (usess->buffer_type) { |
5074 | case LTTNG_BUFFER_PER_UID: | |
5075 | { | |
5076 | struct buffer_reg_uid *reg; | |
6dc3064a | 5077 | |
8c924c7b MD |
5078 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5079 | struct buffer_reg_channel *reg_chan; | |
5080 | struct consumer_socket *socket; | |
6dc3064a | 5081 | |
8c924c7b MD |
5082 | /* Get consumer socket to use to push the metadata.*/ |
5083 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5084 | usess->consumer); | |
5085 | if (!socket) { | |
5086 | ret = -EINVAL; | |
5087 | goto error; | |
5088 | } | |
6dc3064a | 5089 | |
8c924c7b MD |
5090 | memset(pathname, 0, sizeof(pathname)); |
5091 | ret = snprintf(pathname, sizeof(pathname), | |
5092 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5093 | reg->uid, reg->bits_per_long); | |
5094 | if (ret < 0) { | |
5095 | PERROR("snprintf snapshot path"); | |
5096 | goto error; | |
5097 | } | |
5098 | ||
5099 | /* Add the UST default trace dir to path. */ | |
5100 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5101 | reg_chan, node.node) { | |
5102 | ||
5103 | /* | |
5104 | * Make sure the maximum stream size is not lower than the | |
5105 | * subbuffer size or else it's an error since we won't be able to | |
5106 | * snapshot anything. | |
5107 | */ | |
5108 | if (max_stream_size && | |
5109 | reg_chan->subbuf_size > max_stream_size) { | |
5110 | ret = -EINVAL; | |
5111 | DBG3("UST app snapshot record maximum stream size %" PRIu64 | |
6a00837f | 5112 | " is smaller than subbuffer size of %zu", |
8c924c7b MD |
5113 | max_stream_size, reg_chan->subbuf_size); |
5114 | goto error; | |
5115 | } | |
5116 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, output, 0, | |
5117 | usess->uid, usess->gid, pathname, wait, | |
5118 | max_stream_size); | |
5119 | if (ret < 0) { | |
5120 | goto error; | |
5121 | } | |
5122 | } | |
5123 | ret = consumer_snapshot_channel(socket, reg->registry->reg.ust->metadata_key, output, | |
5124 | 1, usess->uid, usess->gid, pathname, wait, | |
5125 | max_stream_size); | |
5126 | if (ret < 0) { | |
5127 | goto error; | |
5128 | } | |
af706bb7 | 5129 | } |
8c924c7b MD |
5130 | break; |
5131 | } | |
5132 | case LTTNG_BUFFER_PER_PID: | |
5133 | { | |
5134 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5135 | struct consumer_socket *socket; | |
5136 | struct lttng_ht_iter chan_iter; | |
5137 | struct ust_app_channel *ua_chan; | |
5138 | struct ust_app_session *ua_sess; | |
5139 | struct ust_registry_session *registry; | |
5140 | ||
5141 | ua_sess = lookup_session_by_app(usess, app); | |
5142 | if (!ua_sess) { | |
5143 | /* Session not associated with this app. */ | |
5144 | continue; | |
5145 | } | |
af706bb7 | 5146 | |
8c924c7b MD |
5147 | /* Get the right consumer socket for the application. */ |
5148 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5149 | output->consumer); | |
5150 | if (!socket) { | |
5c786ded | 5151 | ret = -EINVAL; |
5c786ded JD |
5152 | goto error; |
5153 | } | |
5154 | ||
8c924c7b MD |
5155 | /* Add the UST default trace dir to path. */ |
5156 | memset(pathname, 0, sizeof(pathname)); | |
5157 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5158 | ua_sess->path); | |
6dc3064a | 5159 | if (ret < 0) { |
8c924c7b | 5160 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5161 | goto error; |
5162 | } | |
6dc3064a | 5163 | |
8c924c7b MD |
5164 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5165 | ua_chan, node.node) { | |
5166 | /* | |
5167 | * Make sure the maximum stream size is not lower than the | |
5168 | * subbuffer size or else it's an error since we won't be able to | |
5169 | * snapshot anything. | |
5170 | */ | |
5171 | if (max_stream_size && | |
5172 | ua_chan->attr.subbuf_size > max_stream_size) { | |
5173 | ret = -EINVAL; | |
5174 | DBG3("UST app snapshot record maximum stream size %" PRIu64 | |
5175 | " is smaller than subbuffer size of %" PRIu64, | |
5176 | max_stream_size, ua_chan->attr.subbuf_size); | |
5177 | goto error; | |
5178 | } | |
6dc3064a | 5179 | |
8c924c7b MD |
5180 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, 0, |
5181 | ua_sess->euid, ua_sess->egid, pathname, wait, | |
5182 | max_stream_size); | |
5183 | if (ret < 0) { | |
5184 | goto error; | |
5185 | } | |
5186 | } | |
5187 | ||
5188 | registry = get_session_registry(ua_sess); | |
5189 | assert(registry); | |
5190 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
5191 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, | |
5192 | max_stream_size); | |
5193 | if (ret < 0) { | |
5194 | goto error; | |
5195 | } | |
5196 | } | |
5197 | break; | |
5198 | } | |
5199 | default: | |
5200 | assert(0); | |
5201 | break; | |
6dc3064a DG |
5202 | } |
5203 | ||
5204 | error: | |
5205 | rcu_read_unlock(); | |
5206 | return ret; | |
5207 | } | |
5c786ded JD |
5208 | |
5209 | /* | |
5210 | * Return the number of streams for a UST session. | |
5211 | */ | |
5212 | unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess) | |
5213 | { | |
5214 | unsigned int ret = 0; | |
5215 | struct ust_app *app; | |
5216 | struct lttng_ht_iter iter; | |
5217 | ||
5218 | assert(usess); | |
5219 | ||
5220 | switch (usess->buffer_type) { | |
5221 | case LTTNG_BUFFER_PER_UID: | |
5222 | { | |
5223 | struct buffer_reg_uid *reg; | |
5224 | ||
5225 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5226 | struct buffer_reg_channel *reg_chan; | |
5227 | ||
5228 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5229 | reg_chan, node.node) { | |
5230 | ret += reg_chan->stream_count; | |
5231 | } | |
5232 | } | |
5233 | break; | |
5234 | } | |
5235 | case LTTNG_BUFFER_PER_PID: | |
5236 | { | |
5237 | rcu_read_lock(); | |
5238 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5239 | struct ust_app_channel *ua_chan; | |
5240 | struct ust_app_session *ua_sess; | |
5241 | struct lttng_ht_iter chan_iter; | |
5242 | ||
5243 | ua_sess = lookup_session_by_app(usess, app); | |
5244 | if (!ua_sess) { | |
5245 | /* Session not associated with this app. */ | |
5246 | continue; | |
5247 | } | |
5248 | ||
5249 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5250 | ua_chan, node.node) { | |
5251 | ret += ua_chan->streams.count; | |
5252 | } | |
5253 | } | |
5254 | rcu_read_unlock(); | |
5255 | break; | |
5256 | } | |
5257 | default: | |
5258 | assert(0); | |
5259 | break; | |
5260 | } | |
5261 | ||
5262 | return ret; | |
5263 | } |