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> |
bec39940 | 30 | |
990570ed | 31 | #include <common/common.h> |
86acf0da | 32 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 33 | |
7972aab2 | 34 | #include "buffer-registry.h" |
86acf0da DG |
35 | #include "fd-limit.h" |
36 | #include "health.h" | |
56fff090 | 37 | #include "ust-app.h" |
48842b30 | 38 | #include "ust-consumer.h" |
d80a6244 DG |
39 | #include "ust-ctl.h" |
40 | ||
ffe60014 DG |
41 | /* Next available channel key. */ |
42 | static unsigned long next_channel_key; | |
7972aab2 | 43 | static unsigned long next_session_id; |
ffe60014 DG |
44 | |
45 | /* | |
46 | * Return the atomically incremented value of next_channel_key. | |
47 | */ | |
48 | static inline unsigned long get_next_channel_key(void) | |
49 | { | |
50 | return uatomic_add_return(&next_channel_key, 1); | |
51 | } | |
52 | ||
53 | /* | |
7972aab2 | 54 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 55 | */ |
7972aab2 | 56 | static inline unsigned long get_next_session_id(void) |
ffe60014 | 57 | { |
7972aab2 | 58 | return uatomic_add_return(&next_session_id, 1); |
ffe60014 DG |
59 | } |
60 | ||
025faf73 DG |
61 | /* |
62 | * Match function for the hash table lookup. | |
63 | * | |
64 | * It matches an ust app event based on three attributes which are the event | |
65 | * name, the filter bytecode and the loglevel. | |
66 | */ | |
18eace3b DG |
67 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
68 | { | |
69 | struct ust_app_event *event; | |
70 | const struct ust_app_ht_key *key; | |
71 | ||
72 | assert(node); | |
73 | assert(_key); | |
74 | ||
75 | event = caa_container_of(node, struct ust_app_event, node.node); | |
76 | key = _key; | |
77 | ||
78 | /* Match the 3 elements of the key: name, filter and loglevel. */ | |
79 | ||
80 | /* Event name */ | |
81 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
82 | goto no_match; | |
83 | } | |
84 | ||
85 | /* Event loglevel. */ | |
86 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
87 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
88 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
89 | /* | |
90 | * Match is accepted. This is because on event creation, the | |
91 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
92 | * -1 are accepted for this loglevel type since 0 is the one set by | |
93 | * the API when receiving an enable event. | |
94 | */ | |
95 | } else { | |
96 | goto no_match; | |
97 | } | |
18eace3b DG |
98 | } |
99 | ||
100 | /* One of the filters is NULL, fail. */ | |
101 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
102 | goto no_match; | |
103 | } | |
104 | ||
025faf73 DG |
105 | if (key->filter && event->filter) { |
106 | /* Both filters exists, check length followed by the bytecode. */ | |
107 | if (event->filter->len != key->filter->len || | |
108 | memcmp(event->filter->data, key->filter->data, | |
109 | event->filter->len) != 0) { | |
110 | goto no_match; | |
111 | } | |
18eace3b DG |
112 | } |
113 | ||
025faf73 | 114 | /* Match. */ |
18eace3b DG |
115 | return 1; |
116 | ||
117 | no_match: | |
118 | return 0; | |
18eace3b DG |
119 | } |
120 | ||
025faf73 DG |
121 | /* |
122 | * Unique add of an ust app event in the given ht. This uses the custom | |
123 | * ht_match_ust_app_event match function and the event name as hash. | |
124 | */ | |
d0b96690 | 125 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
126 | struct ust_app_event *event) |
127 | { | |
128 | struct cds_lfht_node *node_ptr; | |
129 | struct ust_app_ht_key key; | |
d0b96690 | 130 | struct lttng_ht *ht; |
18eace3b | 131 | |
d0b96690 DG |
132 | assert(ua_chan); |
133 | assert(ua_chan->events); | |
18eace3b DG |
134 | assert(event); |
135 | ||
d0b96690 | 136 | ht = ua_chan->events; |
18eace3b DG |
137 | key.name = event->attr.name; |
138 | key.filter = event->filter; | |
139 | key.loglevel = event->attr.loglevel; | |
140 | ||
141 | node_ptr = cds_lfht_add_unique(ht->ht, | |
142 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
143 | ht_match_ust_app_event, &key, &event->node.node); | |
144 | assert(node_ptr == &event->node.node); | |
145 | } | |
146 | ||
d88aee68 DG |
147 | /* |
148 | * Close the notify socket from the given RCU head object. This MUST be called | |
149 | * through a call_rcu(). | |
150 | */ | |
151 | static void close_notify_sock_rcu(struct rcu_head *head) | |
152 | { | |
153 | int ret; | |
154 | struct ust_app_notify_sock_obj *obj = | |
155 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
156 | ||
157 | /* Must have a valid fd here. */ | |
158 | assert(obj->fd >= 0); | |
159 | ||
160 | ret = close(obj->fd); | |
161 | if (ret) { | |
162 | ERR("close notify sock %d RCU", obj->fd); | |
163 | } | |
164 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
165 | ||
166 | free(obj); | |
167 | } | |
168 | ||
7972aab2 DG |
169 | /* |
170 | * Return the session registry according to the buffer type of the given | |
171 | * session. | |
172 | * | |
173 | * A registry per UID object MUST exists before calling this function or else | |
174 | * it assert() if not found. RCU read side lock must be acquired. | |
175 | */ | |
176 | static struct ust_registry_session *get_session_registry( | |
177 | struct ust_app_session *ua_sess) | |
178 | { | |
179 | struct ust_registry_session *registry = NULL; | |
180 | ||
181 | assert(ua_sess); | |
182 | ||
183 | switch (ua_sess->buffer_type) { | |
184 | case LTTNG_BUFFER_PER_PID: | |
185 | { | |
186 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
187 | if (!reg_pid) { | |
188 | goto error; | |
189 | } | |
190 | registry = reg_pid->registry->reg.ust; | |
191 | break; | |
192 | } | |
193 | case LTTNG_BUFFER_PER_UID: | |
194 | { | |
195 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
196 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
197 | if (!reg_uid) { | |
198 | goto error; | |
199 | } | |
200 | registry = reg_uid->registry->reg.ust; | |
201 | break; | |
202 | } | |
203 | default: | |
204 | assert(0); | |
205 | }; | |
206 | ||
207 | error: | |
208 | return registry; | |
209 | } | |
210 | ||
55cc08a6 DG |
211 | /* |
212 | * Delete ust context safely. RCU read lock must be held before calling | |
213 | * this function. | |
214 | */ | |
215 | static | |
216 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
217 | { | |
ffe60014 DG |
218 | int ret; |
219 | ||
220 | assert(ua_ctx); | |
221 | ||
55cc08a6 | 222 | if (ua_ctx->obj) { |
ffe60014 | 223 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
224 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
225 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
226 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 227 | } |
55cc08a6 DG |
228 | free(ua_ctx->obj); |
229 | } | |
230 | free(ua_ctx); | |
231 | } | |
232 | ||
d80a6244 DG |
233 | /* |
234 | * Delete ust app event safely. RCU read lock must be held before calling | |
235 | * this function. | |
236 | */ | |
8b366481 DG |
237 | static |
238 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 239 | { |
ffe60014 DG |
240 | int ret; |
241 | ||
242 | assert(ua_event); | |
243 | ||
53a80697 | 244 | free(ua_event->filter); |
d80a6244 | 245 | |
edb67388 | 246 | if (ua_event->obj != NULL) { |
ffe60014 DG |
247 | ret = ustctl_release_object(sock, ua_event->obj); |
248 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
249 | ERR("UST app sock %d release event obj failed with ret %d", | |
250 | sock, ret); | |
251 | } | |
edb67388 DG |
252 | free(ua_event->obj); |
253 | } | |
d80a6244 DG |
254 | free(ua_event); |
255 | } | |
256 | ||
257 | /* | |
7972aab2 DG |
258 | * Release ust data object of the given stream. |
259 | * | |
260 | * Return 0 on success or else a negative value. | |
d80a6244 | 261 | */ |
7972aab2 | 262 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 263 | { |
7972aab2 | 264 | int ret = 0; |
ffe60014 DG |
265 | |
266 | assert(stream); | |
267 | ||
8b366481 | 268 | if (stream->obj) { |
ffe60014 DG |
269 | ret = ustctl_release_object(sock, stream->obj); |
270 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
271 | ERR("UST app sock %d release stream obj failed with ret %d", | |
272 | sock, ret); | |
273 | } | |
4063050c | 274 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
275 | free(stream->obj); |
276 | } | |
7972aab2 DG |
277 | |
278 | return ret; | |
279 | } | |
280 | ||
281 | /* | |
282 | * Delete ust app stream safely. RCU read lock must be held before calling | |
283 | * this function. | |
284 | */ | |
285 | static | |
286 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
287 | { | |
288 | assert(stream); | |
289 | ||
290 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 291 | free(stream); |
d80a6244 DG |
292 | } |
293 | ||
294 | /* | |
295 | * Delete ust app channel safely. RCU read lock must be held before calling | |
296 | * this function. | |
297 | */ | |
8b366481 | 298 | static |
d0b96690 DG |
299 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
300 | struct ust_app *app) | |
d80a6244 DG |
301 | { |
302 | int ret; | |
bec39940 | 303 | struct lttng_ht_iter iter; |
d80a6244 | 304 | struct ust_app_event *ua_event; |
55cc08a6 | 305 | struct ust_app_ctx *ua_ctx; |
030a66fa | 306 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 307 | struct ust_registry_session *registry; |
d80a6244 | 308 | |
ffe60014 DG |
309 | assert(ua_chan); |
310 | ||
311 | DBG3("UST app deleting channel %s", ua_chan->name); | |
312 | ||
55cc08a6 | 313 | /* Wipe stream */ |
d80a6244 | 314 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 315 | cds_list_del(&stream->list); |
d80a6244 DG |
316 | delete_ust_app_stream(sock, stream); |
317 | } | |
318 | ||
55cc08a6 | 319 | /* Wipe context */ |
bec39940 DG |
320 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
321 | ret = lttng_ht_del(ua_chan->ctx, &iter); | |
55cc08a6 DG |
322 | assert(!ret); |
323 | delete_ust_app_ctx(sock, ua_ctx); | |
324 | } | |
bec39940 | 325 | lttng_ht_destroy(ua_chan->ctx); |
d80a6244 | 326 | |
55cc08a6 | 327 | /* Wipe events */ |
bec39940 DG |
328 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
329 | node.node) { | |
330 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 331 | assert(!ret); |
d80a6244 DG |
332 | delete_ust_app_event(sock, ua_event); |
333 | } | |
bec39940 | 334 | lttng_ht_destroy(ua_chan->events); |
edb67388 | 335 | |
45893984 | 336 | /* Wipe and free registry from session registry. */ |
7972aab2 DG |
337 | registry = get_session_registry(ua_chan->session); |
338 | if (registry) { | |
339 | ust_registry_channel_del_free(registry, ua_chan->key); | |
340 | } | |
d0b96690 | 341 | |
edb67388 | 342 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
343 | /* Remove channel from application UST object descriptor. */ |
344 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
345 | lttng_ht_del(app->ust_objd, &iter); | |
ffe60014 DG |
346 | ret = ustctl_release_object(sock, ua_chan->obj); |
347 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
348 | ERR("UST app sock %d release channel obj failed with ret %d", | |
349 | sock, ret); | |
350 | } | |
7972aab2 | 351 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
352 | free(ua_chan->obj); |
353 | } | |
84cd17c6 | 354 | free(ua_chan); |
d80a6244 DG |
355 | } |
356 | ||
d88aee68 DG |
357 | /* |
358 | * For a given application and session, push metadata to consumer. The session | |
359 | * lock MUST be acquired here before calling this. | |
360 | * | |
361 | * Return 0 on success else a negative error. | |
362 | */ | |
7972aab2 DG |
363 | static int push_metadata(struct ust_registry_session *registry, |
364 | struct consumer_output *consumer) | |
d88aee68 DG |
365 | { |
366 | int ret; | |
367 | char *metadata_str = NULL; | |
368 | size_t len, offset; | |
369 | struct consumer_socket *socket; | |
370 | ||
7972aab2 DG |
371 | assert(registry); |
372 | assert(consumer); | |
373 | ||
374 | rcu_read_lock(); | |
d88aee68 | 375 | |
7972aab2 DG |
376 | /* |
377 | * Means that no metadata was assigned to the session. This can happens if | |
378 | * no start has been done previously. | |
379 | */ | |
380 | if (!registry->metadata_key) { | |
d88aee68 | 381 | ret = 0; |
7972aab2 | 382 | goto error_rcu_unlock; |
d88aee68 DG |
383 | } |
384 | ||
d88aee68 | 385 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
386 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
387 | consumer); | |
d88aee68 DG |
388 | if (!socket) { |
389 | ret = -1; | |
390 | goto error_rcu_unlock; | |
391 | } | |
392 | ||
393 | /* | |
394 | * TODO: Currently, we hold the socket lock around sampling of the next | |
395 | * metadata segment to ensure we send metadata over the consumer socket in | |
396 | * the correct order. This makes the registry lock nest inside the socket | |
397 | * lock. | |
398 | * | |
399 | * Please note that this is a temporary measure: we should move this lock | |
400 | * back into ust_consumer_push_metadata() when the consumer gets the | |
401 | * ability to reorder the metadata it receives. | |
402 | */ | |
403 | pthread_mutex_lock(socket->lock); | |
7972aab2 | 404 | pthread_mutex_lock(®istry->lock); |
d88aee68 | 405 | |
7972aab2 DG |
406 | offset = registry->metadata_len_sent; |
407 | len = registry->metadata_len - registry->metadata_len_sent; | |
d88aee68 | 408 | if (len == 0) { |
7972aab2 DG |
409 | DBG3("No metadata to push for metadata key %" PRIu64, |
410 | registry->metadata_key); | |
d88aee68 DG |
411 | ret = 0; |
412 | goto error_reg_unlock; | |
413 | } | |
414 | assert(len > 0); | |
415 | ||
416 | /* Allocate only what we have to send. */ | |
417 | metadata_str = zmalloc(len); | |
418 | if (!metadata_str) { | |
419 | PERROR("zmalloc ust app metadata string"); | |
420 | ret = -ENOMEM; | |
421 | goto error_reg_unlock; | |
422 | } | |
423 | /* Copy what we haven't send out. */ | |
7972aab2 | 424 | memcpy(metadata_str, registry->metadata + offset, len); |
d88aee68 | 425 | |
7972aab2 | 426 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 427 | |
7972aab2 DG |
428 | ret = consumer_push_metadata(socket, registry->metadata_key, |
429 | metadata_str, len, offset); | |
d88aee68 DG |
430 | if (ret < 0) { |
431 | pthread_mutex_unlock(socket->lock); | |
432 | goto error_rcu_unlock; | |
433 | } | |
434 | ||
435 | /* Update len sent of the registry. */ | |
7972aab2 DG |
436 | pthread_mutex_lock(®istry->lock); |
437 | registry->metadata_len_sent += len; | |
438 | pthread_mutex_unlock(®istry->lock); | |
d88aee68 DG |
439 | pthread_mutex_unlock(socket->lock); |
440 | ||
441 | rcu_read_unlock(); | |
442 | free(metadata_str); | |
443 | return 0; | |
444 | ||
445 | error_reg_unlock: | |
7972aab2 | 446 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
447 | pthread_mutex_unlock(socket->lock); |
448 | error_rcu_unlock: | |
449 | rcu_read_unlock(); | |
450 | free(metadata_str); | |
d88aee68 DG |
451 | return ret; |
452 | } | |
453 | ||
454 | /* | |
455 | * Send to the consumer a close metadata command for the given session. Once | |
456 | * done, the metadata channel is deleted and the session metadata pointer is | |
457 | * nullified. The session lock MUST be acquired here unless the application is | |
458 | * in the destroy path. | |
459 | * | |
460 | * Return 0 on success else a negative value. | |
461 | */ | |
7972aab2 DG |
462 | static int close_metadata(struct ust_registry_session *registry, |
463 | struct consumer_output *consumer) | |
d88aee68 DG |
464 | { |
465 | int ret; | |
466 | struct consumer_socket *socket; | |
467 | ||
7972aab2 DG |
468 | assert(registry); |
469 | assert(consumer); | |
d88aee68 | 470 | |
7972aab2 DG |
471 | rcu_read_lock(); |
472 | ||
473 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 DG |
474 | ret = 0; |
475 | goto error; | |
476 | } | |
477 | ||
d88aee68 | 478 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
479 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
480 | consumer); | |
d88aee68 DG |
481 | if (!socket) { |
482 | ret = -1; | |
7972aab2 | 483 | goto error; |
d88aee68 DG |
484 | } |
485 | ||
7972aab2 | 486 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 487 | if (ret < 0) { |
7972aab2 | 488 | goto error; |
d88aee68 DG |
489 | } |
490 | ||
7972aab2 DG |
491 | /* Metadata successfully closed. Flag the registry. */ |
492 | registry->metadata_closed = 1; | |
d88aee68 | 493 | |
d88aee68 | 494 | error: |
7972aab2 | 495 | rcu_read_unlock(); |
d88aee68 DG |
496 | return ret; |
497 | } | |
498 | ||
d80a6244 DG |
499 | /* |
500 | * Delete ust app session safely. RCU read lock must be held before calling | |
501 | * this function. | |
502 | */ | |
8b366481 | 503 | static |
d0b96690 DG |
504 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
505 | struct ust_app *app) | |
d80a6244 DG |
506 | { |
507 | int ret; | |
bec39940 | 508 | struct lttng_ht_iter iter; |
d80a6244 | 509 | struct ust_app_channel *ua_chan; |
7972aab2 | 510 | struct ust_registry_session *registry; |
d80a6244 | 511 | |
d88aee68 DG |
512 | assert(ua_sess); |
513 | ||
7972aab2 DG |
514 | registry = get_session_registry(ua_sess); |
515 | if (registry) { | |
d88aee68 | 516 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 517 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 518 | |
7972aab2 DG |
519 | /* |
520 | * Don't ask to close metadata for global per UID buffers. Close | |
521 | * metadata only on destroy trace session in this case. | |
522 | */ | |
523 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { | |
524 | /* And ask to close it for this session registry. */ | |
525 | (void) close_metadata(registry, ua_sess->consumer); | |
526 | } | |
d80a6244 DG |
527 | } |
528 | ||
bec39940 DG |
529 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
530 | node.node) { | |
531 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 532 | assert(!ret); |
d0b96690 | 533 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 534 | } |
bec39940 | 535 | lttng_ht_destroy(ua_sess->channels); |
d80a6244 | 536 | |
7972aab2 DG |
537 | /* In case of per PID, the registry is kept in the session. */ |
538 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
539 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
540 | if (reg_pid) { | |
541 | buffer_reg_pid_remove(reg_pid); | |
542 | buffer_reg_pid_destroy(reg_pid); | |
543 | } | |
544 | } | |
d0b96690 | 545 | |
aee6bafd | 546 | if (ua_sess->handle != -1) { |
ffe60014 DG |
547 | ret = ustctl_release_handle(sock, ua_sess->handle); |
548 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
549 | ERR("UST app sock %d release session handle failed with ret %d", | |
550 | sock, ret); | |
551 | } | |
aee6bafd | 552 | } |
8b366481 | 553 | free(ua_sess); |
d80a6244 | 554 | } |
91d76f53 DG |
555 | |
556 | /* | |
284d8f55 DG |
557 | * Delete a traceable application structure from the global list. Never call |
558 | * this function outside of a call_rcu call. | |
91d76f53 | 559 | */ |
8b366481 DG |
560 | static |
561 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 562 | { |
8b366481 | 563 | int ret, sock; |
d42f20df | 564 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 565 | |
f6a9efaa | 566 | rcu_read_lock(); |
44d3bd01 | 567 | |
d80a6244 | 568 | /* Delete ust app sessions info */ |
852d0037 DG |
569 | sock = app->sock; |
570 | app->sock = -1; | |
d80a6244 | 571 | |
d42f20df DG |
572 | lttng_ht_destroy(app->sessions); |
573 | ||
8b366481 | 574 | /* Wipe sessions */ |
d42f20df DG |
575 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
576 | teardown_node) { | |
577 | /* Free every object in the session and the session. */ | |
d0b96690 | 578 | delete_ust_app_session(sock, ua_sess, app); |
d80a6244 | 579 | } |
7972aab2 | 580 | lttng_ht_destroy(app->ust_objd); |
d80a6244 | 581 | |
6414a713 | 582 | /* |
852d0037 DG |
583 | * Wait until we have deleted the application from the sock hash table |
584 | * before closing this socket, otherwise an application could re-use the | |
585 | * socket ID and race with the teardown, using the same hash table entry. | |
586 | * | |
587 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
588 | * all RCU readers that could run concurrently with unregister app, | |
589 | * therefore we _need_ to only close that socket after a grace period. So | |
590 | * it should stay in this RCU callback. | |
591 | * | |
592 | * This close() is a very important step of the synchronization model so | |
593 | * every modification to this function must be carefully reviewed. | |
6414a713 | 594 | */ |
799e2c4f MD |
595 | ret = close(sock); |
596 | if (ret) { | |
597 | PERROR("close"); | |
598 | } | |
4063050c | 599 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 600 | |
852d0037 | 601 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 602 | free(app); |
bec39940 | 603 | |
f6a9efaa | 604 | rcu_read_unlock(); |
099e26bd DG |
605 | } |
606 | ||
607 | /* | |
f6a9efaa | 608 | * URCU intermediate call to delete an UST app. |
099e26bd | 609 | */ |
8b366481 DG |
610 | static |
611 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 612 | { |
bec39940 DG |
613 | struct lttng_ht_node_ulong *node = |
614 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 615 | struct ust_app *app = |
852d0037 | 616 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 617 | |
852d0037 | 618 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 619 | delete_ust_app(app); |
099e26bd DG |
620 | } |
621 | ||
ffe60014 DG |
622 | /* |
623 | * Delete the session from the application ht and delete the data structure by | |
624 | * freeing every object inside and releasing them. | |
625 | */ | |
d0b96690 | 626 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
627 | struct ust_app_session *ua_sess) |
628 | { | |
629 | int ret; | |
630 | struct lttng_ht_iter iter; | |
631 | ||
632 | assert(app); | |
633 | assert(ua_sess); | |
634 | ||
635 | iter.iter.node = &ua_sess->node.node; | |
636 | ret = lttng_ht_del(app->sessions, &iter); | |
637 | if (ret) { | |
638 | /* Already scheduled for teardown. */ | |
639 | goto end; | |
640 | } | |
641 | ||
642 | /* Once deleted, free the data structure. */ | |
d0b96690 | 643 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
644 | |
645 | end: | |
646 | return; | |
647 | } | |
648 | ||
8b366481 DG |
649 | /* |
650 | * Alloc new UST app session. | |
651 | */ | |
652 | static | |
d0b96690 | 653 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
654 | { |
655 | struct ust_app_session *ua_sess; | |
656 | ||
657 | /* Init most of the default value by allocating and zeroing */ | |
658 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
659 | if (ua_sess == NULL) { | |
660 | PERROR("malloc"); | |
ffe60014 | 661 | goto error_free; |
8b366481 DG |
662 | } |
663 | ||
664 | ua_sess->handle = -1; | |
bec39940 | 665 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
d0b96690 | 666 | pthread_mutex_init(&ua_sess->lock, NULL); |
ffe60014 | 667 | |
8b366481 DG |
668 | return ua_sess; |
669 | ||
ffe60014 | 670 | error_free: |
8b366481 DG |
671 | return NULL; |
672 | } | |
673 | ||
674 | /* | |
675 | * Alloc new UST app channel. | |
676 | */ | |
677 | static | |
678 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 679 | struct ust_app_session *ua_sess, |
ffe60014 | 680 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
681 | { |
682 | struct ust_app_channel *ua_chan; | |
683 | ||
684 | /* Init most of the default value by allocating and zeroing */ | |
685 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
686 | if (ua_chan == NULL) { | |
687 | PERROR("malloc"); | |
688 | goto error; | |
689 | } | |
690 | ||
691 | /* Setup channel name */ | |
692 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
693 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
694 | ||
695 | ua_chan->enabled = 1; | |
696 | ua_chan->handle = -1; | |
45893984 | 697 | ua_chan->session = ua_sess; |
ffe60014 | 698 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
699 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
700 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
701 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
702 | |
703 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
704 | ||
705 | /* Copy attributes */ | |
706 | if (attr) { | |
ffe60014 | 707 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
708 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
709 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
710 | ua_chan->attr.overwrite = attr->overwrite; | |
711 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
712 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
713 | ua_chan->attr.output = attr->output; | |
8b366481 | 714 | } |
ffe60014 DG |
715 | /* By default, the channel is a per cpu channel. */ |
716 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
717 | |
718 | DBG3("UST app channel %s allocated", ua_chan->name); | |
719 | ||
720 | return ua_chan; | |
721 | ||
722 | error: | |
723 | return NULL; | |
724 | } | |
725 | ||
37f1c236 DG |
726 | /* |
727 | * Allocate and initialize a UST app stream. | |
728 | * | |
729 | * Return newly allocated stream pointer or NULL on error. | |
730 | */ | |
ffe60014 | 731 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
732 | { |
733 | struct ust_app_stream *stream = NULL; | |
734 | ||
735 | stream = zmalloc(sizeof(*stream)); | |
736 | if (stream == NULL) { | |
737 | PERROR("zmalloc ust app stream"); | |
738 | goto error; | |
739 | } | |
740 | ||
741 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
742 | stream->handle = -1; | |
743 | ||
744 | error: | |
745 | return stream; | |
746 | } | |
747 | ||
8b366481 DG |
748 | /* |
749 | * Alloc new UST app event. | |
750 | */ | |
751 | static | |
752 | struct ust_app_event *alloc_ust_app_event(char *name, | |
753 | struct lttng_ust_event *attr) | |
754 | { | |
755 | struct ust_app_event *ua_event; | |
756 | ||
757 | /* Init most of the default value by allocating and zeroing */ | |
758 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
759 | if (ua_event == NULL) { | |
760 | PERROR("malloc"); | |
761 | goto error; | |
762 | } | |
763 | ||
764 | ua_event->enabled = 1; | |
765 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
766 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 767 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
768 | |
769 | /* Copy attributes */ | |
770 | if (attr) { | |
771 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
772 | } | |
773 | ||
774 | DBG3("UST app event %s allocated", ua_event->name); | |
775 | ||
776 | return ua_event; | |
777 | ||
778 | error: | |
779 | return NULL; | |
780 | } | |
781 | ||
782 | /* | |
783 | * Alloc new UST app context. | |
784 | */ | |
785 | static | |
786 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
787 | { | |
788 | struct ust_app_ctx *ua_ctx; | |
789 | ||
790 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
791 | if (ua_ctx == NULL) { | |
792 | goto error; | |
793 | } | |
794 | ||
795 | if (uctx) { | |
796 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
797 | } | |
798 | ||
799 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
800 | ||
801 | error: | |
802 | return ua_ctx; | |
803 | } | |
804 | ||
025faf73 DG |
805 | /* |
806 | * Allocate a filter and copy the given original filter. | |
807 | * | |
808 | * Return allocated filter or NULL on error. | |
809 | */ | |
810 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
811 | struct lttng_ust_filter_bytecode *orig_f) | |
812 | { | |
813 | struct lttng_ust_filter_bytecode *filter = NULL; | |
814 | ||
815 | /* Copy filter bytecode */ | |
816 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
817 | if (!filter) { | |
818 | PERROR("zmalloc alloc ust app filter"); | |
819 | goto error; | |
820 | } | |
821 | ||
822 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
823 | ||
824 | error: | |
825 | return filter; | |
826 | } | |
827 | ||
099e26bd | 828 | /* |
421cb601 DG |
829 | * Find an ust_app using the sock and return it. RCU read side lock must be |
830 | * held before calling this helper function. | |
099e26bd | 831 | */ |
8b366481 DG |
832 | static |
833 | struct ust_app *find_app_by_sock(int sock) | |
099e26bd | 834 | { |
bec39940 | 835 | struct lttng_ht_node_ulong *node; |
bec39940 | 836 | struct lttng_ht_iter iter; |
f6a9efaa | 837 | |
852d0037 | 838 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 839 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
840 | if (node == NULL) { |
841 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
842 | goto error; |
843 | } | |
852d0037 DG |
844 | |
845 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
846 | |
847 | error: | |
848 | return NULL; | |
099e26bd DG |
849 | } |
850 | ||
d0b96690 DG |
851 | /* |
852 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
853 | * be held before calling this helper function. | |
854 | */ | |
855 | static struct ust_app *find_app_by_notify_sock(int sock) | |
856 | { | |
857 | struct lttng_ht_node_ulong *node; | |
858 | struct lttng_ht_iter iter; | |
859 | ||
860 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
861 | &iter); | |
862 | node = lttng_ht_iter_get_node_ulong(&iter); | |
863 | if (node == NULL) { | |
864 | DBG2("UST app find by notify sock %d not found", sock); | |
865 | goto error; | |
866 | } | |
867 | ||
868 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
869 | ||
870 | error: | |
871 | return NULL; | |
872 | } | |
873 | ||
025faf73 DG |
874 | /* |
875 | * Lookup for an ust app event based on event name, filter bytecode and the | |
876 | * event loglevel. | |
877 | * | |
878 | * Return an ust_app_event object or NULL on error. | |
879 | */ | |
18eace3b DG |
880 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
881 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel) | |
882 | { | |
883 | struct lttng_ht_iter iter; | |
884 | struct lttng_ht_node_str *node; | |
885 | struct ust_app_event *event = NULL; | |
886 | struct ust_app_ht_key key; | |
18eace3b DG |
887 | |
888 | assert(name); | |
889 | assert(ht); | |
890 | ||
891 | /* Setup key for event lookup. */ | |
892 | key.name = name; | |
893 | key.filter = filter; | |
894 | key.loglevel = loglevel; | |
895 | ||
025faf73 DG |
896 | /* Lookup using the event name as hash and a custom match fct. */ |
897 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
898 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
899 | node = lttng_ht_iter_get_node_str(&iter); |
900 | if (node == NULL) { | |
901 | goto end; | |
902 | } | |
903 | ||
904 | event = caa_container_of(node, struct ust_app_event, node); | |
905 | ||
906 | end: | |
18eace3b DG |
907 | return event; |
908 | } | |
909 | ||
55cc08a6 DG |
910 | /* |
911 | * Create the channel context on the tracer. | |
d0b96690 DG |
912 | * |
913 | * Called with UST app session lock held. | |
55cc08a6 DG |
914 | */ |
915 | static | |
916 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
917 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
918 | { | |
919 | int ret; | |
920 | ||
840cb59c | 921 | health_code_update(); |
86acf0da | 922 | |
852d0037 | 923 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
924 | ua_chan->obj, &ua_ctx->obj); |
925 | if (ret < 0) { | |
ffe60014 DG |
926 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
927 | ERR("UST app create channel context failed for app (pid: %d) " | |
928 | "with ret %d", app->pid, ret); | |
929 | } else { | |
930 | DBG3("UST app disable event failed. Application is dead."); | |
931 | } | |
55cc08a6 DG |
932 | goto error; |
933 | } | |
934 | ||
935 | ua_ctx->handle = ua_ctx->obj->handle; | |
936 | ||
d0b96690 DG |
937 | DBG2("UST app context handle %d created successfully for channel %s", |
938 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
939 | |
940 | error: | |
840cb59c | 941 | health_code_update(); |
55cc08a6 DG |
942 | return ret; |
943 | } | |
944 | ||
53a80697 MD |
945 | /* |
946 | * Set the filter on the tracer. | |
947 | */ | |
948 | static | |
949 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
950 | struct ust_app *app) | |
951 | { | |
952 | int ret; | |
953 | ||
840cb59c | 954 | health_code_update(); |
86acf0da | 955 | |
53a80697 | 956 | if (!ua_event->filter) { |
86acf0da DG |
957 | ret = 0; |
958 | goto error; | |
53a80697 MD |
959 | } |
960 | ||
961 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
962 | ua_event->obj); | |
963 | if (ret < 0) { | |
ffe60014 DG |
964 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
965 | ERR("UST app event %s filter failed for app (pid: %d) " | |
966 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
967 | } else { | |
968 | DBG3("UST app filter event failed. Application is dead."); | |
969 | } | |
53a80697 MD |
970 | goto error; |
971 | } | |
972 | ||
973 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
974 | ||
975 | error: | |
840cb59c | 976 | health_code_update(); |
53a80697 MD |
977 | return ret; |
978 | } | |
979 | ||
9730260e DG |
980 | /* |
981 | * Disable the specified event on to UST tracer for the UST session. | |
982 | */ | |
983 | static int disable_ust_event(struct ust_app *app, | |
984 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
985 | { | |
986 | int ret; | |
987 | ||
840cb59c | 988 | health_code_update(); |
86acf0da | 989 | |
852d0037 | 990 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 991 | if (ret < 0) { |
ffe60014 DG |
992 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
993 | ERR("UST app event %s disable failed for app (pid: %d) " | |
994 | "and session handle %d with ret %d", | |
995 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
996 | } else { | |
997 | DBG3("UST app disable event failed. Application is dead."); | |
998 | } | |
9730260e DG |
999 | goto error; |
1000 | } | |
1001 | ||
1002 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1003 | ua_event->attr.name, app->pid); |
9730260e DG |
1004 | |
1005 | error: | |
840cb59c | 1006 | health_code_update(); |
9730260e DG |
1007 | return ret; |
1008 | } | |
1009 | ||
78f0bacd DG |
1010 | /* |
1011 | * Disable the specified channel on to UST tracer for the UST session. | |
1012 | */ | |
1013 | static int disable_ust_channel(struct ust_app *app, | |
1014 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1015 | { | |
1016 | int ret; | |
1017 | ||
840cb59c | 1018 | health_code_update(); |
86acf0da | 1019 | |
852d0037 | 1020 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1021 | if (ret < 0) { |
ffe60014 DG |
1022 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1023 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1024 | "and session handle %d with ret %d", | |
1025 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1026 | } else { | |
1027 | DBG3("UST app disable channel failed. Application is dead."); | |
1028 | } | |
78f0bacd DG |
1029 | goto error; |
1030 | } | |
1031 | ||
78f0bacd | 1032 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1033 | ua_chan->name, app->pid); |
78f0bacd DG |
1034 | |
1035 | error: | |
840cb59c | 1036 | health_code_update(); |
78f0bacd DG |
1037 | return ret; |
1038 | } | |
1039 | ||
1040 | /* | |
1041 | * Enable the specified channel on to UST tracer for the UST session. | |
1042 | */ | |
1043 | static int enable_ust_channel(struct ust_app *app, | |
1044 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1045 | { | |
1046 | int ret; | |
1047 | ||
840cb59c | 1048 | health_code_update(); |
86acf0da | 1049 | |
852d0037 | 1050 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1051 | if (ret < 0) { |
ffe60014 DG |
1052 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1053 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1054 | "and session handle %d with ret %d", | |
1055 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1056 | } else { | |
1057 | DBG3("UST app enable channel failed. Application is dead."); | |
1058 | } | |
78f0bacd DG |
1059 | goto error; |
1060 | } | |
1061 | ||
1062 | ua_chan->enabled = 1; | |
1063 | ||
1064 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1065 | ua_chan->name, app->pid); |
78f0bacd DG |
1066 | |
1067 | error: | |
840cb59c | 1068 | health_code_update(); |
78f0bacd DG |
1069 | return ret; |
1070 | } | |
1071 | ||
edb67388 DG |
1072 | /* |
1073 | * Enable the specified event on to UST tracer for the UST session. | |
1074 | */ | |
1075 | static int enable_ust_event(struct ust_app *app, | |
1076 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1077 | { | |
1078 | int ret; | |
1079 | ||
840cb59c | 1080 | health_code_update(); |
86acf0da | 1081 | |
852d0037 | 1082 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1083 | if (ret < 0) { |
ffe60014 DG |
1084 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1085 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1086 | "and session handle %d with ret %d", | |
1087 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1088 | } else { | |
1089 | DBG3("UST app enable event failed. Application is dead."); | |
1090 | } | |
edb67388 DG |
1091 | goto error; |
1092 | } | |
1093 | ||
1094 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1095 | ua_event->attr.name, app->pid); |
edb67388 DG |
1096 | |
1097 | error: | |
840cb59c | 1098 | health_code_update(); |
edb67388 DG |
1099 | return ret; |
1100 | } | |
1101 | ||
099e26bd | 1102 | /* |
7972aab2 | 1103 | * Send channel and stream buffer to application. |
4f3ab6ee | 1104 | * |
ffe60014 | 1105 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1106 | */ |
7972aab2 DG |
1107 | static int send_channel_pid_to_ust(struct ust_app *app, |
1108 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1109 | { |
1110 | int ret; | |
ffe60014 | 1111 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1112 | |
1113 | assert(app); | |
ffe60014 | 1114 | assert(ua_sess); |
4f3ab6ee | 1115 | assert(ua_chan); |
4f3ab6ee | 1116 | |
840cb59c | 1117 | health_code_update(); |
4f3ab6ee | 1118 | |
7972aab2 DG |
1119 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1120 | app->sock); | |
86acf0da | 1121 | |
ffe60014 DG |
1122 | /* Send channel to the application. */ |
1123 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1124 | if (ret < 0) { |
b551a063 DG |
1125 | goto error; |
1126 | } | |
1127 | ||
d88aee68 DG |
1128 | health_code_update(); |
1129 | ||
ffe60014 DG |
1130 | /* Send all streams to application. */ |
1131 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1132 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1133 | if (ret < 0) { | |
1134 | goto error; | |
1135 | } | |
1136 | /* We don't need the stream anymore once sent to the tracer. */ | |
1137 | cds_list_del(&stream->list); | |
1138 | delete_ust_app_stream(-1, stream); | |
1139 | } | |
ffe60014 DG |
1140 | /* Flag the channel that it is sent to the application. */ |
1141 | ua_chan->is_sent = 1; | |
ffe60014 | 1142 | |
b551a063 | 1143 | error: |
840cb59c | 1144 | health_code_update(); |
b551a063 DG |
1145 | return ret; |
1146 | } | |
1147 | ||
91d76f53 | 1148 | /* |
5b4a0ec0 | 1149 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1150 | * |
1151 | * Should be called with session mutex held. | |
91d76f53 | 1152 | */ |
edb67388 DG |
1153 | static |
1154 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1155 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1156 | { |
5b4a0ec0 | 1157 | int ret = 0; |
284d8f55 | 1158 | |
840cb59c | 1159 | health_code_update(); |
86acf0da | 1160 | |
5b4a0ec0 | 1161 | /* Create UST event on tracer */ |
852d0037 | 1162 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1163 | &ua_event->obj); |
1164 | if (ret < 0) { | |
ffe60014 DG |
1165 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1166 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1167 | ua_event->attr.name, app->pid, ret); | |
1168 | } else { | |
1169 | DBG3("UST app create event failed. Application is dead."); | |
1170 | } | |
5b4a0ec0 | 1171 | goto error; |
91d76f53 | 1172 | } |
f6a9efaa | 1173 | |
5b4a0ec0 | 1174 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1175 | |
5b4a0ec0 | 1176 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1177 | ua_event->attr.name, app->pid); |
f6a9efaa | 1178 | |
840cb59c | 1179 | health_code_update(); |
86acf0da | 1180 | |
025faf73 DG |
1181 | /* Set filter if one is present. */ |
1182 | if (ua_event->filter) { | |
1183 | ret = set_ust_event_filter(ua_event, app); | |
1184 | if (ret < 0) { | |
1185 | goto error; | |
1186 | } | |
1187 | } | |
1188 | ||
8535a6d9 | 1189 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 1190 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
1191 | ret = disable_ust_event(app, ua_sess, ua_event); |
1192 | if (ret < 0) { | |
fc34caaa DG |
1193 | /* |
1194 | * If we hit an EPERM, something is wrong with our disable call. If | |
1195 | * we get an EEXIST, there is a problem on the tracer side since we | |
1196 | * just created it. | |
1197 | */ | |
1198 | switch (ret) { | |
49c336c1 | 1199 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1200 | /* Code flow problem */ |
1201 | assert(0); | |
49c336c1 | 1202 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1203 | /* It's OK for our use case. */ |
1204 | ret = 0; | |
1205 | break; | |
1206 | default: | |
1207 | break; | |
1208 | } | |
8535a6d9 DG |
1209 | goto error; |
1210 | } | |
1211 | } | |
1212 | ||
5b4a0ec0 | 1213 | error: |
840cb59c | 1214 | health_code_update(); |
5b4a0ec0 | 1215 | return ret; |
91d76f53 | 1216 | } |
48842b30 | 1217 | |
5b4a0ec0 DG |
1218 | /* |
1219 | * Copy data between an UST app event and a LTT event. | |
1220 | */ | |
421cb601 | 1221 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1222 | struct ltt_ust_event *uevent) |
1223 | { | |
1224 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); | |
1225 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1226 | ||
fc34caaa DG |
1227 | ua_event->enabled = uevent->enabled; |
1228 | ||
5b4a0ec0 DG |
1229 | /* Copy event attributes */ |
1230 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1231 | ||
53a80697 MD |
1232 | /* Copy filter bytecode */ |
1233 | if (uevent->filter) { | |
025faf73 DG |
1234 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1235 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1236 | } |
48842b30 DG |
1237 | } |
1238 | ||
5b4a0ec0 DG |
1239 | /* |
1240 | * Copy data between an UST app channel and a LTT channel. | |
1241 | */ | |
421cb601 | 1242 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1243 | struct ltt_ust_channel *uchan) |
1244 | { | |
bec39940 | 1245 | struct lttng_ht_iter iter; |
48842b30 | 1246 | struct ltt_ust_event *uevent; |
55cc08a6 | 1247 | struct ltt_ust_context *uctx; |
48842b30 | 1248 | struct ust_app_event *ua_event; |
55cc08a6 | 1249 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1250 | |
fc34caaa | 1251 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1252 | |
1253 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1254 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 DG |
1255 | |
1256 | /* Copy event attributes since the layout is different. */ | |
1257 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1258 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1259 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1260 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1261 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1262 | ua_chan->attr.output = uchan->attr.output; | |
1263 | /* | |
1264 | * Note that the attribute channel type is not set since the channel on the | |
1265 | * tracing registry side does not have this information. | |
1266 | */ | |
48842b30 | 1267 | |
fc34caaa | 1268 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1269 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1270 | |
bec39940 | 1271 | cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) { |
55cc08a6 DG |
1272 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1273 | if (ua_ctx == NULL) { | |
1274 | continue; | |
1275 | } | |
bec39940 DG |
1276 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1277 | (unsigned long) ua_ctx->ctx.ctx); | |
1278 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
55cc08a6 | 1279 | } |
48842b30 | 1280 | |
421cb601 | 1281 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1282 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b DG |
1283 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
1284 | uevent->filter, uevent->attr.loglevel); | |
1285 | if (ua_event == NULL) { | |
421cb601 | 1286 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1287 | uevent->attr.name); |
284d8f55 | 1288 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1289 | if (ua_event == NULL) { |
5b4a0ec0 | 1290 | continue; |
48842b30 | 1291 | } |
421cb601 | 1292 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1293 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1294 | } |
48842b30 DG |
1295 | } |
1296 | ||
fc34caaa | 1297 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1298 | } |
1299 | ||
5b4a0ec0 DG |
1300 | /* |
1301 | * Copy data between a UST app session and a regular LTT session. | |
1302 | */ | |
421cb601 | 1303 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1304 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1305 | { |
bec39940 DG |
1306 | struct lttng_ht_node_str *ua_chan_node; |
1307 | struct lttng_ht_iter iter; | |
48842b30 DG |
1308 | struct ltt_ust_channel *uchan; |
1309 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1310 | time_t rawtime; |
1311 | struct tm *timeinfo; | |
1312 | char datetime[16]; | |
1313 | int ret; | |
1314 | ||
1315 | /* Get date and time for unique app path */ | |
1316 | time(&rawtime); | |
1317 | timeinfo = localtime(&rawtime); | |
1318 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1319 | |
421cb601 | 1320 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1321 | |
7972aab2 DG |
1322 | ua_sess->tracing_id = usess->id; |
1323 | ua_sess->id = get_next_session_id(); | |
1324 | ua_sess->uid = app->uid; | |
1325 | ua_sess->gid = app->gid; | |
1326 | ua_sess->euid = usess->uid; | |
1327 | ua_sess->egid = usess->gid; | |
1328 | ua_sess->buffer_type = usess->buffer_type; | |
1329 | ua_sess->bits_per_long = app->bits_per_long; | |
1330 | /* There is only one consumer object per session possible. */ | |
1331 | ua_sess->consumer = usess->consumer; | |
1332 | ||
1333 | switch (ua_sess->buffer_type) { | |
1334 | case LTTNG_BUFFER_PER_PID: | |
1335 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1336 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s/", app->name, app->pid, | |
1337 | datetime); | |
1338 | break; | |
1339 | case LTTNG_BUFFER_PER_UID: | |
1340 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1341 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1342 | break; | |
1343 | default: | |
1344 | assert(0); | |
1345 | goto error; | |
1346 | } | |
477d7741 MD |
1347 | if (ret < 0) { |
1348 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1349 | assert(0); |
7972aab2 | 1350 | goto error; |
477d7741 MD |
1351 | } |
1352 | ||
48842b30 | 1353 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1354 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1355 | uchan, node.node) { | |
1356 | struct lttng_ht_iter uiter; | |
ba767faf | 1357 | |
bec39940 DG |
1358 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1359 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1360 | if (ua_chan_node != NULL) { |
fc34caaa | 1361 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1362 | continue; |
1363 | } | |
421cb601 | 1364 | |
5b4a0ec0 DG |
1365 | DBG2("Channel %s not found on shadow session copy, creating it", |
1366 | uchan->name); | |
d0b96690 | 1367 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1368 | if (ua_chan == NULL) { |
fc34caaa | 1369 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1370 | continue; |
48842b30 | 1371 | } |
5b4a0ec0 | 1372 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1373 | /* |
1374 | * The concept of metadata channel does not exist on the tracing | |
1375 | * registry side of the session daemon so this can only be a per CPU | |
1376 | * channel and not metadata. | |
1377 | */ | |
1378 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1379 | ||
bec39940 | 1380 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1381 | } |
7972aab2 DG |
1382 | |
1383 | error: | |
1384 | return; | |
48842b30 DG |
1385 | } |
1386 | ||
78f0bacd DG |
1387 | /* |
1388 | * Lookup sesison wrapper. | |
1389 | */ | |
84cd17c6 MD |
1390 | static |
1391 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1392 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1393 | { |
1394 | /* Get right UST app session from app */ | |
2c348c10 | 1395 | lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter); |
84cd17c6 MD |
1396 | } |
1397 | ||
421cb601 DG |
1398 | /* |
1399 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1400 | * id. |
421cb601 | 1401 | */ |
48842b30 DG |
1402 | static struct ust_app_session *lookup_session_by_app( |
1403 | struct ltt_ust_session *usess, struct ust_app *app) | |
1404 | { | |
bec39940 DG |
1405 | struct lttng_ht_iter iter; |
1406 | struct lttng_ht_node_ulong *node; | |
48842b30 | 1407 | |
84cd17c6 | 1408 | __lookup_session_by_app(usess, app, &iter); |
bec39940 | 1409 | node = lttng_ht_iter_get_node_ulong(&iter); |
48842b30 DG |
1410 | if (node == NULL) { |
1411 | goto error; | |
1412 | } | |
1413 | ||
1414 | return caa_container_of(node, struct ust_app_session, node); | |
1415 | ||
1416 | error: | |
1417 | return NULL; | |
1418 | } | |
1419 | ||
7972aab2 DG |
1420 | /* |
1421 | * Setup buffer registry per PID for the given session and application. If none | |
1422 | * is found, a new one is created, added to the global registry and | |
1423 | * initialized. If regp is valid, it's set with the newly created object. | |
1424 | * | |
1425 | * Return 0 on success or else a negative value. | |
1426 | */ | |
1427 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1428 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1429 | { | |
1430 | int ret = 0; | |
1431 | struct buffer_reg_pid *reg_pid; | |
1432 | ||
1433 | assert(ua_sess); | |
1434 | assert(app); | |
1435 | ||
1436 | rcu_read_lock(); | |
1437 | ||
1438 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1439 | if (!reg_pid) { | |
1440 | /* | |
1441 | * This is the create channel path meaning that if there is NO | |
1442 | * registry available, we have to create one for this session. | |
1443 | */ | |
1444 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1445 | if (ret < 0) { | |
1446 | goto error; | |
1447 | } | |
1448 | buffer_reg_pid_add(reg_pid); | |
1449 | } else { | |
1450 | goto end; | |
1451 | } | |
1452 | ||
1453 | /* Initialize registry. */ | |
1454 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1455 | app->bits_per_long, app->uint8_t_alignment, | |
1456 | app->uint16_t_alignment, app->uint32_t_alignment, | |
1457 | app->uint64_t_alignment, app->long_alignment, app->byte_order); | |
1458 | if (ret < 0) { | |
1459 | goto error; | |
1460 | } | |
1461 | ||
1462 | DBG3("UST app buffer registry per PID created successfully"); | |
1463 | ||
1464 | end: | |
1465 | if (regp) { | |
1466 | *regp = reg_pid; | |
1467 | } | |
1468 | error: | |
1469 | rcu_read_unlock(); | |
1470 | return ret; | |
1471 | } | |
1472 | ||
1473 | /* | |
1474 | * Setup buffer registry per UID for the given session and application. If none | |
1475 | * is found, a new one is created, added to the global registry and | |
1476 | * initialized. If regp is valid, it's set with the newly created object. | |
1477 | * | |
1478 | * Return 0 on success or else a negative value. | |
1479 | */ | |
1480 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1481 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1482 | { | |
1483 | int ret = 0; | |
1484 | struct buffer_reg_uid *reg_uid; | |
1485 | ||
1486 | assert(usess); | |
1487 | assert(app); | |
1488 | ||
1489 | rcu_read_lock(); | |
1490 | ||
1491 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1492 | if (!reg_uid) { | |
1493 | /* | |
1494 | * This is the create channel path meaning that if there is NO | |
1495 | * registry available, we have to create one for this session. | |
1496 | */ | |
1497 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1498 | LTTNG_DOMAIN_UST, ®_uid); | |
1499 | if (ret < 0) { | |
1500 | goto error; | |
1501 | } | |
1502 | buffer_reg_uid_add(reg_uid); | |
1503 | } else { | |
1504 | goto end; | |
1505 | } | |
1506 | ||
1507 | /* Initialize registry. */ | |
1508 | ret = ust_registry_session_init(®_uid->registry->reg.ust, app, | |
1509 | app->bits_per_long, app->uint8_t_alignment, | |
1510 | app->uint16_t_alignment, app->uint32_t_alignment, | |
1511 | app->uint64_t_alignment, app->long_alignment, app->byte_order); | |
1512 | if (ret < 0) { | |
1513 | goto error; | |
1514 | } | |
1515 | /* Add node to teardown list of the session. */ | |
1516 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1517 | ||
1518 | DBG3("UST app buffer registry per UID created successfully"); | |
1519 | ||
1520 | end: | |
1521 | if (regp) { | |
1522 | *regp = reg_uid; | |
1523 | } | |
1524 | error: | |
1525 | rcu_read_unlock(); | |
1526 | return ret; | |
1527 | } | |
1528 | ||
421cb601 | 1529 | /* |
3d8ca23b | 1530 | * Create a session on the tracer side for the given app. |
421cb601 | 1531 | * |
3d8ca23b DG |
1532 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1533 | * untouched. If the session was created, is_created is set to 1. On error, | |
1534 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1535 | * be NULL. | |
1536 | * | |
1537 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1538 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1539 | */ |
3d8ca23b DG |
1540 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1541 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1542 | int *is_created) | |
421cb601 | 1543 | { |
3d8ca23b | 1544 | int ret, created = 0; |
421cb601 DG |
1545 | struct ust_app_session *ua_sess; |
1546 | ||
3d8ca23b DG |
1547 | assert(usess); |
1548 | assert(app); | |
1549 | assert(ua_sess_ptr); | |
1550 | ||
840cb59c | 1551 | health_code_update(); |
86acf0da | 1552 | |
421cb601 DG |
1553 | ua_sess = lookup_session_by_app(usess, app); |
1554 | if (ua_sess == NULL) { | |
a991f516 | 1555 | DBG2("UST app pid: %d session id %d not found, creating it", |
852d0037 | 1556 | app->pid, usess->id); |
d0b96690 | 1557 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1558 | if (ua_sess == NULL) { |
1559 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1560 | ret = -ENOMEM; |
1561 | goto error; | |
421cb601 | 1562 | } |
477d7741 | 1563 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1564 | created = 1; |
421cb601 DG |
1565 | } |
1566 | ||
7972aab2 DG |
1567 | switch (usess->buffer_type) { |
1568 | case LTTNG_BUFFER_PER_PID: | |
1569 | /* Init local registry. */ | |
1570 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1571 | if (ret < 0) { |
7972aab2 DG |
1572 | goto error; |
1573 | } | |
1574 | break; | |
1575 | case LTTNG_BUFFER_PER_UID: | |
1576 | /* Look for a global registry. If none exists, create one. */ | |
1577 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1578 | if (ret < 0) { | |
1579 | goto error; | |
1580 | } | |
1581 | break; | |
1582 | default: | |
1583 | assert(0); | |
1584 | ret = -EINVAL; | |
1585 | goto error; | |
1586 | } | |
1587 | ||
1588 | health_code_update(); | |
1589 | ||
1590 | if (ua_sess->handle == -1) { | |
1591 | ret = ustctl_create_session(app->sock); | |
1592 | if (ret < 0) { | |
1593 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1594 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1595 | app->pid, ret); |
1596 | } else { | |
1597 | DBG("UST app creating session failed. Application is dead"); | |
1598 | } | |
d0b96690 | 1599 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1600 | if (ret != -ENOMEM) { |
1601 | /* | |
1602 | * Tracer is probably gone or got an internal error so let's | |
1603 | * behave like it will soon unregister or not usable. | |
1604 | */ | |
1605 | ret = -ENOTCONN; | |
1606 | } | |
1607 | goto error; | |
421cb601 DG |
1608 | } |
1609 | ||
7972aab2 DG |
1610 | ua_sess->handle = ret; |
1611 | ||
1612 | /* Add ust app session to app's HT */ | |
1613 | lttng_ht_node_init_ulong(&ua_sess->node, | |
1614 | (unsigned long) ua_sess->tracing_id); | |
1615 | lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node); | |
1616 | ||
1617 | DBG2("UST app session created successfully with handle %d", ret); | |
1618 | } | |
1619 | ||
1620 | *ua_sess_ptr = ua_sess; | |
1621 | if (is_created) { | |
1622 | *is_created = created; | |
1623 | } | |
1624 | ||
1625 | /* Everything went well. */ | |
1626 | ret = 0; | |
1627 | ||
1628 | error: | |
1629 | health_code_update(); | |
1630 | return ret; | |
1631 | } | |
1632 | ||
1633 | /* | |
1634 | * Create a context for the channel on the tracer. | |
1635 | * | |
1636 | * Called with UST app session lock held and a RCU read side lock. | |
1637 | */ | |
1638 | static | |
1639 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1640 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1641 | struct ust_app *app) | |
1642 | { | |
1643 | int ret = 0; | |
1644 | struct lttng_ht_iter iter; | |
1645 | struct lttng_ht_node_ulong *node; | |
1646 | struct ust_app_ctx *ua_ctx; | |
1647 | ||
1648 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1649 | ||
1650 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); | |
1651 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1652 | if (node != NULL) { | |
1653 | ret = -EEXIST; | |
1654 | goto error; | |
1655 | } | |
1656 | ||
1657 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1658 | if (ua_ctx == NULL) { | |
1659 | /* malloc failed */ | |
1660 | ret = -1; | |
1661 | goto error; | |
1662 | } | |
1663 | ||
1664 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
1665 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
1666 | ||
1667 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1668 | if (ret < 0) { | |
1669 | goto error; | |
1670 | } | |
1671 | ||
1672 | error: | |
1673 | return ret; | |
1674 | } | |
1675 | ||
1676 | /* | |
1677 | * Enable on the tracer side a ust app event for the session and channel. | |
1678 | * | |
1679 | * Called with UST app session lock held. | |
1680 | */ | |
1681 | static | |
1682 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
1683 | struct ust_app_event *ua_event, struct ust_app *app) | |
1684 | { | |
1685 | int ret; | |
1686 | ||
1687 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1688 | if (ret < 0) { | |
1689 | goto error; | |
1690 | } | |
1691 | ||
1692 | ua_event->enabled = 1; | |
1693 | ||
1694 | error: | |
1695 | return ret; | |
1696 | } | |
1697 | ||
1698 | /* | |
1699 | * Disable on the tracer side a ust app event for the session and channel. | |
1700 | */ | |
1701 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
1702 | struct ust_app_event *ua_event, struct ust_app *app) | |
1703 | { | |
1704 | int ret; | |
1705 | ||
1706 | ret = disable_ust_event(app, ua_sess, ua_event); | |
1707 | if (ret < 0) { | |
1708 | goto error; | |
1709 | } | |
1710 | ||
1711 | ua_event->enabled = 0; | |
1712 | ||
1713 | error: | |
1714 | return ret; | |
1715 | } | |
1716 | ||
1717 | /* | |
1718 | * Lookup ust app channel for session and disable it on the tracer side. | |
1719 | */ | |
1720 | static | |
1721 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
1722 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
1723 | { | |
1724 | int ret; | |
1725 | ||
1726 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
1727 | if (ret < 0) { | |
1728 | goto error; | |
1729 | } | |
1730 | ||
1731 | ua_chan->enabled = 0; | |
1732 | ||
1733 | error: | |
1734 | return ret; | |
1735 | } | |
1736 | ||
1737 | /* | |
1738 | * Lookup ust app channel for session and enable it on the tracer side. This | |
1739 | * MUST be called with a RCU read side lock acquired. | |
1740 | */ | |
1741 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
1742 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
1743 | { | |
1744 | int ret = 0; | |
1745 | struct lttng_ht_iter iter; | |
1746 | struct lttng_ht_node_str *ua_chan_node; | |
1747 | struct ust_app_channel *ua_chan; | |
1748 | ||
1749 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
1750 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
1751 | if (ua_chan_node == NULL) { | |
1752 | DBG2("Unable to find channel %s in ust session id %u", | |
1753 | uchan->name, ua_sess->tracing_id); | |
1754 | goto error; | |
1755 | } | |
1756 | ||
1757 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
1758 | ||
1759 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
1760 | if (ret < 0) { | |
1761 | goto error; | |
1762 | } | |
1763 | ||
1764 | error: | |
1765 | return ret; | |
1766 | } | |
1767 | ||
1768 | /* | |
1769 | * Ask the consumer to create a channel and get it if successful. | |
1770 | * | |
1771 | * Return 0 on success or else a negative value. | |
1772 | */ | |
1773 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
1774 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
1775 | int bitness, struct ust_registry_session *registry) | |
1776 | { | |
1777 | int ret; | |
1778 | unsigned int nb_fd = 0; | |
1779 | struct consumer_socket *socket; | |
1780 | ||
1781 | assert(usess); | |
1782 | assert(ua_sess); | |
1783 | assert(ua_chan); | |
1784 | assert(registry); | |
1785 | ||
1786 | rcu_read_lock(); | |
1787 | health_code_update(); | |
1788 | ||
1789 | /* Get the right consumer socket for the application. */ | |
1790 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
1791 | if (!socket) { | |
1792 | ret = -EINVAL; | |
1793 | goto error; | |
1794 | } | |
1795 | ||
1796 | health_code_update(); | |
1797 | ||
1798 | /* Need one fd for the channel. */ | |
1799 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
1800 | if (ret < 0) { | |
1801 | ERR("Exhausted number of available FD upon create channel"); | |
1802 | goto error; | |
1803 | } | |
1804 | ||
1805 | /* | |
1806 | * Ask consumer to create channel. The consumer will return the number of | |
1807 | * stream we have to expect. | |
1808 | */ | |
1809 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
1810 | registry); | |
1811 | if (ret < 0) { | |
1812 | goto error_ask; | |
1813 | } | |
1814 | ||
1815 | /* | |
1816 | * Compute the number of fd needed before receiving them. It must be 2 per | |
1817 | * stream (2 being the default value here). | |
1818 | */ | |
1819 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
1820 | ||
1821 | /* Reserve the amount of file descriptor we need. */ | |
1822 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
1823 | if (ret < 0) { | |
1824 | ERR("Exhausted number of available FD upon create channel"); | |
1825 | goto error_fd_get_stream; | |
1826 | } | |
1827 | ||
1828 | health_code_update(); | |
1829 | ||
1830 | /* | |
1831 | * Now get the channel from the consumer. This call wil populate the stream | |
1832 | * list of that channel and set the ust objects. | |
1833 | */ | |
1834 | ret = ust_consumer_get_channel(socket, ua_chan); | |
1835 | if (ret < 0) { | |
1836 | goto error_destroy; | |
1837 | } | |
1838 | ||
1839 | rcu_read_unlock(); | |
1840 | return 0; | |
1841 | ||
1842 | error_destroy: | |
1843 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
1844 | error_fd_get_stream: | |
1845 | /* | |
1846 | * Initiate a destroy channel on the consumer since we had an error | |
1847 | * handling it on our side. The return value is of no importance since we | |
1848 | * already have a ret value set by the previous error that we need to | |
1849 | * return. | |
1850 | */ | |
1851 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
1852 | error_ask: | |
1853 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
1854 | error: | |
1855 | health_code_update(); | |
1856 | rcu_read_unlock(); | |
1857 | return ret; | |
1858 | } | |
1859 | ||
1860 | /* | |
1861 | * Duplicate the ust data object of the ust app stream and save it in the | |
1862 | * buffer registry stream. | |
1863 | * | |
1864 | * Return 0 on success or else a negative value. | |
1865 | */ | |
1866 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
1867 | struct ust_app_stream *stream) | |
1868 | { | |
1869 | int ret; | |
1870 | ||
1871 | assert(reg_stream); | |
1872 | assert(stream); | |
1873 | ||
1874 | /* Reserve the amount of file descriptor we need. */ | |
1875 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
1876 | if (ret < 0) { | |
1877 | ERR("Exhausted number of available FD upon duplicate stream"); | |
1878 | goto error; | |
1879 | } | |
1880 | ||
1881 | /* Duplicate object for stream once the original is in the registry. */ | |
1882 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
1883 | reg_stream->obj.ust); | |
1884 | if (ret < 0) { | |
1885 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
1886 | reg_stream->obj.ust, stream->obj, ret); | |
1887 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
1888 | goto error; | |
1889 | } | |
1890 | stream->handle = stream->obj->handle; | |
1891 | ||
1892 | error: | |
1893 | return ret; | |
1894 | } | |
1895 | ||
1896 | /* | |
1897 | * Duplicate the ust data object of the ust app. channel and save it in the | |
1898 | * buffer registry channel. | |
1899 | * | |
1900 | * Return 0 on success or else a negative value. | |
1901 | */ | |
1902 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
1903 | struct ust_app_channel *ua_chan) | |
1904 | { | |
1905 | int ret; | |
1906 | ||
1907 | assert(reg_chan); | |
1908 | assert(ua_chan); | |
1909 | ||
1910 | /* Need two fds for the channel. */ | |
1911 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
1912 | if (ret < 0) { | |
1913 | ERR("Exhausted number of available FD upon duplicate channel"); | |
1914 | goto error_fd_get; | |
1915 | } | |
1916 | ||
1917 | /* Duplicate object for stream once the original is in the registry. */ | |
1918 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
1919 | if (ret < 0) { | |
1920 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
1921 | reg_chan->obj.ust, ua_chan->obj, ret); | |
1922 | goto error; | |
1923 | } | |
1924 | ua_chan->handle = ua_chan->obj->handle; | |
1925 | ||
1926 | return 0; | |
1927 | ||
1928 | error: | |
1929 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
1930 | error_fd_get: | |
1931 | return ret; | |
1932 | } | |
1933 | ||
1934 | /* | |
1935 | * For a given channel buffer registry, setup all streams of the given ust | |
1936 | * application channel. | |
1937 | * | |
1938 | * Return 0 on success or else a negative value. | |
1939 | */ | |
1940 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
1941 | struct ust_app_channel *ua_chan) | |
1942 | { | |
1943 | int ret = 0; | |
1944 | struct ust_app_stream *stream, *stmp; | |
1945 | ||
1946 | assert(reg_chan); | |
1947 | assert(ua_chan); | |
1948 | ||
1949 | DBG2("UST app setup buffer registry stream"); | |
1950 | ||
1951 | /* Send all streams to application. */ | |
1952 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1953 | struct buffer_reg_stream *reg_stream; | |
1954 | ||
1955 | ret = buffer_reg_stream_create(®_stream); | |
1956 | if (ret < 0) { | |
1957 | goto error; | |
1958 | } | |
1959 | ||
1960 | /* | |
1961 | * Keep original pointer and nullify it in the stream so the delete | |
1962 | * stream call does not release the object. | |
1963 | */ | |
1964 | reg_stream->obj.ust = stream->obj; | |
1965 | stream->obj = NULL; | |
1966 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 1967 | |
7972aab2 DG |
1968 | /* We don't need the streams anymore. */ |
1969 | cds_list_del(&stream->list); | |
1970 | delete_ust_app_stream(-1, stream); | |
1971 | } | |
421cb601 | 1972 | |
7972aab2 DG |
1973 | error: |
1974 | return ret; | |
1975 | } | |
1976 | ||
1977 | /* | |
1978 | * Create a buffer registry channel for the given session registry and | |
1979 | * application channel object. If regp pointer is valid, it's set with the | |
1980 | * created object. Important, the created object is NOT added to the session | |
1981 | * registry hash table. | |
1982 | * | |
1983 | * Return 0 on success else a negative value. | |
1984 | */ | |
1985 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
1986 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
1987 | { | |
1988 | int ret; | |
1989 | struct buffer_reg_channel *reg_chan = NULL; | |
1990 | ||
1991 | assert(reg_sess); | |
1992 | assert(ua_chan); | |
1993 | ||
1994 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
1995 | ||
1996 | /* Create buffer registry channel. */ | |
1997 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
1998 | if (ret < 0) { | |
1999 | goto error_create; | |
421cb601 | 2000 | } |
7972aab2 DG |
2001 | assert(reg_chan); |
2002 | reg_chan->consumer_key = ua_chan->key; | |
421cb601 | 2003 | |
7972aab2 DG |
2004 | /* Create and add a channel registry to session. */ |
2005 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2006 | ua_chan->tracing_channel_id); | |
2007 | if (ret < 0) { | |
2008 | goto error; | |
d88aee68 | 2009 | } |
7972aab2 | 2010 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2011 | |
7972aab2 DG |
2012 | if (regp) { |
2013 | *regp = reg_chan; | |
3d8ca23b | 2014 | } |
d88aee68 | 2015 | |
7972aab2 | 2016 | return 0; |
3d8ca23b DG |
2017 | |
2018 | error: | |
7972aab2 DG |
2019 | /* Safe because the registry channel object was not added to any HT. */ |
2020 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2021 | error_create: | |
3d8ca23b | 2022 | return ret; |
421cb601 DG |
2023 | } |
2024 | ||
55cc08a6 | 2025 | /* |
7972aab2 DG |
2026 | * Setup buffer registry channel for the given session registry and application |
2027 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2028 | * |
7972aab2 | 2029 | * Return 0 on success else a negative value. |
55cc08a6 | 2030 | */ |
7972aab2 DG |
2031 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2032 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2033 | { |
7972aab2 | 2034 | int ret; |
55cc08a6 | 2035 | |
7972aab2 DG |
2036 | assert(reg_sess); |
2037 | assert(reg_chan); | |
2038 | assert(ua_chan); | |
2039 | assert(ua_chan->obj); | |
55cc08a6 | 2040 | |
7972aab2 | 2041 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2042 | |
7972aab2 DG |
2043 | /* Setup all streams for the registry. */ |
2044 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2045 | if (ret < 0) { | |
55cc08a6 DG |
2046 | goto error; |
2047 | } | |
2048 | ||
7972aab2 DG |
2049 | reg_chan->obj.ust = ua_chan->obj; |
2050 | ua_chan->obj = NULL; | |
55cc08a6 | 2051 | |
7972aab2 | 2052 | return 0; |
55cc08a6 DG |
2053 | |
2054 | error: | |
7972aab2 DG |
2055 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2056 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2057 | return ret; |
2058 | } | |
2059 | ||
edb67388 | 2060 | /* |
7972aab2 | 2061 | * Send buffer registry channel to the application. |
d0b96690 | 2062 | * |
7972aab2 | 2063 | * Return 0 on success else a negative value. |
edb67388 | 2064 | */ |
7972aab2 DG |
2065 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2066 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2067 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2068 | { |
2069 | int ret; | |
7972aab2 | 2070 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2071 | |
7972aab2 DG |
2072 | assert(reg_chan); |
2073 | assert(app); | |
2074 | assert(ua_sess); | |
2075 | assert(ua_chan); | |
2076 | ||
2077 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2078 | ||
2079 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2080 | if (ret < 0) { |
2081 | goto error; | |
2082 | } | |
2083 | ||
7972aab2 DG |
2084 | /* Send channel to the application. */ |
2085 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2086 | if (ret < 0) { | |
2087 | goto error; | |
2088 | } | |
2089 | ||
2090 | health_code_update(); | |
2091 | ||
2092 | /* Send all streams to application. */ | |
2093 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2094 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2095 | struct ust_app_stream stream; | |
2096 | ||
2097 | ret = duplicate_stream_object(reg_stream, &stream); | |
2098 | if (ret < 0) { | |
2099 | goto error_stream_unlock; | |
2100 | } | |
2101 | ||
2102 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2103 | if (ret < 0) { | |
2104 | goto error_stream_unlock; | |
2105 | } | |
edb67388 | 2106 | |
7972aab2 DG |
2107 | /* |
2108 | * The return value is not important here. This function will output an | |
2109 | * error if needed. | |
2110 | */ | |
2111 | (void) release_ust_app_stream(-1, &stream); | |
2112 | } | |
2113 | ua_chan->is_sent = 1; | |
2114 | ||
2115 | error_stream_unlock: | |
2116 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2117 | error: |
2118 | return ret; | |
2119 | } | |
2120 | ||
9730260e | 2121 | /* |
7972aab2 DG |
2122 | * Create and send to the application the created buffers with per UID buffers. |
2123 | * | |
2124 | * Return 0 on success else a negative value. | |
9730260e | 2125 | */ |
7972aab2 DG |
2126 | static int create_channel_per_uid(struct ust_app *app, |
2127 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2128 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2129 | { |
2130 | int ret; | |
7972aab2 DG |
2131 | struct buffer_reg_uid *reg_uid; |
2132 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2133 | |
7972aab2 DG |
2134 | assert(app); |
2135 | assert(usess); | |
2136 | assert(ua_sess); | |
2137 | assert(ua_chan); | |
2138 | ||
2139 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2140 | ||
2141 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2142 | /* | |
2143 | * The session creation handles the creation of this global registry | |
2144 | * object. If none can be find, there is a code flow problem or a | |
2145 | * teardown race. | |
2146 | */ | |
2147 | assert(reg_uid); | |
2148 | ||
2149 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2150 | reg_uid); | |
2151 | if (!reg_chan) { | |
2152 | /* Create the buffer registry channel object. */ | |
2153 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2154 | if (ret < 0) { | |
2155 | goto error; | |
2156 | } | |
2157 | assert(reg_chan); | |
2158 | ||
2159 | /* | |
2160 | * Create the buffers on the consumer side. This call populates the | |
2161 | * ust app channel object with all streams and data object. | |
2162 | */ | |
2163 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2164 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2165 | if (ret < 0) { | |
2166 | goto error; | |
2167 | } | |
2168 | ||
2169 | /* | |
2170 | * Setup the streams and add it to the session registry. | |
2171 | */ | |
2172 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2173 | if (ret < 0) { | |
2174 | goto error; | |
2175 | } | |
2176 | ||
2177 | } | |
2178 | ||
2179 | /* Send buffers to the application. */ | |
2180 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2181 | if (ret < 0) { |
2182 | goto error; | |
2183 | } | |
2184 | ||
9730260e DG |
2185 | error: |
2186 | return ret; | |
2187 | } | |
2188 | ||
78f0bacd | 2189 | /* |
7972aab2 DG |
2190 | * Create and send to the application the created buffers with per PID buffers. |
2191 | * | |
2192 | * Return 0 on success else a negative value. | |
78f0bacd | 2193 | */ |
7972aab2 DG |
2194 | static int create_channel_per_pid(struct ust_app *app, |
2195 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2196 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2197 | { |
8535a6d9 | 2198 | int ret; |
7972aab2 | 2199 | struct ust_registry_session *registry; |
78f0bacd | 2200 | |
7972aab2 DG |
2201 | assert(app); |
2202 | assert(usess); | |
2203 | assert(ua_sess); | |
2204 | assert(ua_chan); | |
2205 | ||
2206 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2207 | ||
2208 | rcu_read_lock(); | |
2209 | ||
2210 | registry = get_session_registry(ua_sess); | |
2211 | assert(registry); | |
2212 | ||
2213 | /* Create and add a new channel registry to session. */ | |
2214 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2215 | if (ret < 0) { |
2216 | goto error; | |
2217 | } | |
2218 | ||
7972aab2 DG |
2219 | /* Create and get channel on the consumer side. */ |
2220 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2221 | app->bits_per_long, registry); | |
2222 | if (ret < 0) { | |
2223 | goto error; | |
2224 | } | |
2225 | ||
2226 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2227 | if (ret < 0) { | |
2228 | goto error; | |
2229 | } | |
8535a6d9 | 2230 | |
78f0bacd | 2231 | error: |
7972aab2 | 2232 | rcu_read_unlock(); |
78f0bacd DG |
2233 | return ret; |
2234 | } | |
2235 | ||
2236 | /* | |
7972aab2 DG |
2237 | * From an already allocated ust app channel, create the channel buffers if |
2238 | * need and send it to the application. This MUST be called with a RCU read | |
2239 | * side lock acquired. | |
2240 | * | |
2241 | * Return 0 on success or else a negative value. | |
78f0bacd | 2242 | */ |
7972aab2 DG |
2243 | static int do_create_channel(struct ust_app *app, |
2244 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2245 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2246 | { |
7972aab2 | 2247 | int ret; |
78f0bacd | 2248 | |
7972aab2 DG |
2249 | assert(app); |
2250 | assert(usess); | |
2251 | assert(ua_sess); | |
2252 | assert(ua_chan); | |
2253 | ||
2254 | /* Handle buffer type before sending the channel to the application. */ | |
2255 | switch (usess->buffer_type) { | |
2256 | case LTTNG_BUFFER_PER_UID: | |
2257 | { | |
2258 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2259 | if (ret < 0) { | |
2260 | goto error; | |
2261 | } | |
2262 | break; | |
2263 | } | |
2264 | case LTTNG_BUFFER_PER_PID: | |
2265 | { | |
2266 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2267 | if (ret < 0) { | |
2268 | goto error; | |
2269 | } | |
2270 | break; | |
2271 | } | |
2272 | default: | |
2273 | assert(0); | |
2274 | ret = -EINVAL; | |
78f0bacd DG |
2275 | goto error; |
2276 | } | |
2277 | ||
7972aab2 DG |
2278 | /* Initialize ust objd object using the received handle and add it. */ |
2279 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2280 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2281 | |
7972aab2 DG |
2282 | /* If channel is not enabled, disable it on the tracer */ |
2283 | if (!ua_chan->enabled) { | |
2284 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2285 | if (ret < 0) { | |
2286 | goto error; | |
2287 | } | |
78f0bacd DG |
2288 | } |
2289 | ||
2290 | error: | |
2291 | return ret; | |
2292 | } | |
2293 | ||
284d8f55 | 2294 | /* |
4d710ac2 DG |
2295 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2296 | * newly created channel if not NULL. | |
d0b96690 DG |
2297 | * |
2298 | * Called with UST app session lock held. | |
7972aab2 DG |
2299 | * |
2300 | * Return 0 on success or else a negative value. | |
284d8f55 | 2301 | */ |
4d710ac2 DG |
2302 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2303 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2304 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2305 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2306 | { |
2307 | int ret = 0; | |
bec39940 DG |
2308 | struct lttng_ht_iter iter; |
2309 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2310 | struct ust_app_channel *ua_chan; |
2311 | ||
2312 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2313 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2314 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2315 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2316 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2317 | goto end; |
5b4a0ec0 DG |
2318 | } |
2319 | ||
d0b96690 | 2320 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2321 | if (ua_chan == NULL) { |
2322 | /* Only malloc can fail here */ | |
4d710ac2 | 2323 | ret = -ENOMEM; |
fc34caaa DG |
2324 | goto error; |
2325 | } | |
2326 | shadow_copy_channel(ua_chan, uchan); | |
2327 | ||
ffe60014 DG |
2328 | /* Set channel type. */ |
2329 | ua_chan->attr.type = type; | |
2330 | ||
7972aab2 | 2331 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2332 | if (ret < 0) { |
2333 | goto error; | |
2334 | } | |
2335 | ||
fc34caaa | 2336 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2337 | app->pid); |
fc34caaa | 2338 | |
d0b96690 DG |
2339 | /* Only add the channel if successful on the tracer side. */ |
2340 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2341 | ||
fc34caaa | 2342 | end: |
4d710ac2 DG |
2343 | if (ua_chanp) { |
2344 | *ua_chanp = ua_chan; | |
2345 | } | |
2346 | ||
2347 | /* Everything went well. */ | |
2348 | return 0; | |
5b4a0ec0 DG |
2349 | |
2350 | error: | |
d0b96690 | 2351 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
4d710ac2 | 2352 | return ret; |
5b4a0ec0 DG |
2353 | } |
2354 | ||
2355 | /* | |
2356 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2357 | * |
2358 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2359 | */ |
edb67388 DG |
2360 | static |
2361 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2362 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2363 | struct ust_app *app) | |
284d8f55 | 2364 | { |
edb67388 | 2365 | int ret = 0; |
5b4a0ec0 | 2366 | struct ust_app_event *ua_event; |
284d8f55 | 2367 | |
5b4a0ec0 | 2368 | /* Get event node */ |
18eace3b DG |
2369 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
2370 | uevent->filter, uevent->attr.loglevel); | |
2371 | if (ua_event != NULL) { | |
fc34caaa | 2372 | ret = -EEXIST; |
edb67388 DG |
2373 | goto end; |
2374 | } | |
5b4a0ec0 | 2375 | |
edb67388 DG |
2376 | /* Does not exist so create one */ |
2377 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2378 | if (ua_event == NULL) { | |
2379 | /* Only malloc can failed so something is really wrong */ | |
2380 | ret = -ENOMEM; | |
fc34caaa | 2381 | goto end; |
5b4a0ec0 | 2382 | } |
edb67388 | 2383 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2384 | |
edb67388 | 2385 | /* Create it on the tracer side */ |
5b4a0ec0 | 2386 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2387 | if (ret < 0) { |
fc34caaa | 2388 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2389 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2390 | goto error; |
2391 | } | |
2392 | ||
d0b96690 | 2393 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2394 | |
fc34caaa | 2395 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2396 | app->pid); |
7f79d3a1 | 2397 | |
edb67388 | 2398 | end: |
fc34caaa DG |
2399 | return ret; |
2400 | ||
5b4a0ec0 | 2401 | error: |
fc34caaa DG |
2402 | /* Valid. Calling here is already in a read side lock */ |
2403 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2404 | return ret; |
5b4a0ec0 DG |
2405 | } |
2406 | ||
2407 | /* | |
2408 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2409 | * |
7972aab2 | 2410 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2411 | */ |
2412 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ffe60014 | 2413 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
2414 | { |
2415 | int ret = 0; | |
ffe60014 | 2416 | struct ust_app_channel *metadata; |
d88aee68 | 2417 | struct consumer_socket *socket; |
7972aab2 | 2418 | struct ust_registry_session *registry; |
5b4a0ec0 | 2419 | |
ffe60014 DG |
2420 | assert(ua_sess); |
2421 | assert(app); | |
d88aee68 | 2422 | assert(consumer); |
5b4a0ec0 | 2423 | |
7972aab2 DG |
2424 | registry = get_session_registry(ua_sess); |
2425 | assert(registry); | |
2426 | ||
2427 | /* Metadata already exists for this registry. */ | |
2428 | if (registry->metadata_key) { | |
2429 | ret = 0; | |
2430 | goto error; | |
5b4a0ec0 DG |
2431 | } |
2432 | ||
ffe60014 | 2433 | /* Allocate UST metadata */ |
d0b96690 | 2434 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2435 | if (!metadata) { |
2436 | /* malloc() failed */ | |
2437 | ret = -ENOMEM; | |
2438 | goto error; | |
2439 | } | |
5b4a0ec0 | 2440 | |
ffe60014 DG |
2441 | /* Set default attributes for metadata. */ |
2442 | metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
2443 | metadata->attr.subbuf_size = default_get_metadata_subbuf_size(); | |
2444 | metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
6bb9e85f MD |
2445 | metadata->attr.switch_timer_interval = DEFAULT_UST_CHANNEL_SWITCH_TIMER; |
2446 | metadata->attr.read_timer_interval = DEFAULT_UST_CHANNEL_READ_TIMER; | |
ffe60014 DG |
2447 | metadata->attr.output = LTTNG_UST_MMAP; |
2448 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
5b4a0ec0 | 2449 | |
d88aee68 | 2450 | /* Get the right consumer socket for the application. */ |
7972aab2 | 2451 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); |
d88aee68 DG |
2452 | if (!socket) { |
2453 | ret = -EINVAL; | |
2454 | goto error_consumer; | |
2455 | } | |
2456 | ||
7972aab2 DG |
2457 | /* Need one fd for the channel. */ |
2458 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2459 | if (ret < 0) { | |
2460 | ERR("Exhausted number of available FD upon create metadata"); | |
2461 | goto error; | |
2462 | } | |
2463 | ||
d88aee68 DG |
2464 | /* |
2465 | * Ask the metadata channel creation to the consumer. The metadata object | |
2466 | * will be created by the consumer and kept their. However, the stream is | |
2467 | * never added or monitored until we do a first push metadata to the | |
2468 | * consumer. | |
2469 | */ | |
7972aab2 DG |
2470 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2471 | registry); | |
d88aee68 | 2472 | if (ret < 0) { |
7972aab2 DG |
2473 | /* |
2474 | * Safe because the metadata obj pointer is not set so the delete below | |
2475 | * will not put a FD back again. | |
2476 | */ | |
2477 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
d88aee68 DG |
2478 | goto error_consumer; |
2479 | } | |
2480 | ||
2481 | /* | |
2482 | * The setup command will make the metadata stream be sent to the relayd, | |
2483 | * if applicable, and the thread managing the metadatas. This is important | |
2484 | * because after this point, if an error occurs, the only way the stream | |
2485 | * can be deleted is to be monitored in the consumer. | |
2486 | */ | |
7972aab2 | 2487 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2488 | if (ret < 0) { |
7972aab2 DG |
2489 | /* |
2490 | * Safe because the metadata obj pointer is not set so the delete below | |
2491 | * will not put a FD back again. | |
2492 | */ | |
2493 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
d88aee68 | 2494 | goto error_consumer; |
5b4a0ec0 DG |
2495 | } |
2496 | ||
7972aab2 DG |
2497 | /* Keep metadata key so we can identify it on the consumer side. */ |
2498 | registry->metadata_key = metadata->key; | |
ffe60014 | 2499 | |
7972aab2 DG |
2500 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2501 | metadata->key, app->pid); | |
5b4a0ec0 | 2502 | |
d88aee68 DG |
2503 | error_consumer: |
2504 | delete_ust_app_channel(-1, metadata, app); | |
5b4a0ec0 | 2505 | error: |
ffe60014 | 2506 | return ret; |
5b4a0ec0 DG |
2507 | } |
2508 | ||
2509 | /* | |
2510 | * Return pointer to traceable apps list. | |
2511 | */ | |
bec39940 | 2512 | struct lttng_ht *ust_app_get_ht(void) |
5b4a0ec0 DG |
2513 | { |
2514 | return ust_app_ht; | |
2515 | } | |
2516 | ||
2517 | /* | |
d88aee68 DG |
2518 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2519 | * acquired before calling this function. | |
5b4a0ec0 DG |
2520 | */ |
2521 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2522 | { | |
d88aee68 | 2523 | struct ust_app *app = NULL; |
bec39940 DG |
2524 | struct lttng_ht_node_ulong *node; |
2525 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2526 | |
bec39940 DG |
2527 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2528 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2529 | if (node == NULL) { |
2530 | DBG2("UST app no found with pid %d", pid); | |
2531 | goto error; | |
2532 | } | |
5b4a0ec0 DG |
2533 | |
2534 | DBG2("Found UST app by pid %d", pid); | |
2535 | ||
d88aee68 | 2536 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2537 | |
2538 | error: | |
d88aee68 | 2539 | return app; |
5b4a0ec0 DG |
2540 | } |
2541 | ||
d88aee68 DG |
2542 | /* |
2543 | * Allocate and init an UST app object using the registration information and | |
2544 | * the command socket. This is called when the command socket connects to the | |
2545 | * session daemon. | |
2546 | * | |
2547 | * The object is returned on success or else NULL. | |
2548 | */ | |
d0b96690 | 2549 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2550 | { |
d0b96690 DG |
2551 | struct ust_app *lta = NULL; |
2552 | ||
2553 | assert(msg); | |
2554 | assert(sock >= 0); | |
2555 | ||
2556 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2557 | |
173af62f DG |
2558 | if ((msg->bits_per_long == 64 && |
2559 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2560 | || (msg->bits_per_long == 32 && | |
2561 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2562 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2563 | "%d-bit long, but no consumerd for this size is available.\n", |
2564 | msg->name, msg->pid, msg->bits_per_long); | |
2565 | goto error; | |
3f2c5fcc | 2566 | } |
d0b96690 | 2567 | |
5b4a0ec0 DG |
2568 | lta = zmalloc(sizeof(struct ust_app)); |
2569 | if (lta == NULL) { | |
2570 | PERROR("malloc"); | |
d0b96690 | 2571 | goto error; |
5b4a0ec0 DG |
2572 | } |
2573 | ||
2574 | lta->ppid = msg->ppid; | |
2575 | lta->uid = msg->uid; | |
2576 | lta->gid = msg->gid; | |
d0b96690 | 2577 | |
7753dea8 | 2578 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2579 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2580 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2581 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2582 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2583 | lta->long_alignment = msg->long_alignment; | |
2584 | lta->byte_order = msg->byte_order; | |
2585 | ||
5b4a0ec0 DG |
2586 | lta->v_major = msg->major; |
2587 | lta->v_minor = msg->minor; | |
bec39940 | 2588 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 DG |
2589 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2590 | lta->notify_sock = -1; | |
d88aee68 DG |
2591 | |
2592 | /* Copy name and make sure it's NULL terminated. */ | |
2593 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2594 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2595 | ||
2596 | /* | |
2597 | * Before this can be called, when receiving the registration information, | |
2598 | * the application compatibility is checked. So, at this point, the | |
2599 | * application can work with this session daemon. | |
2600 | */ | |
d0b96690 | 2601 | lta->compatible = 1; |
5b4a0ec0 | 2602 | |
852d0037 | 2603 | lta->pid = msg->pid; |
d0b96690 | 2604 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2605 | lta->sock = sock; |
d0b96690 | 2606 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2607 | |
d42f20df DG |
2608 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2609 | ||
d0b96690 DG |
2610 | error: |
2611 | return lta; | |
2612 | } | |
2613 | ||
d88aee68 DG |
2614 | /* |
2615 | * For a given application object, add it to every hash table. | |
2616 | */ | |
d0b96690 DG |
2617 | void ust_app_add(struct ust_app *app) |
2618 | { | |
2619 | assert(app); | |
2620 | assert(app->notify_sock >= 0); | |
2621 | ||
5b4a0ec0 | 2622 | rcu_read_lock(); |
852d0037 DG |
2623 | |
2624 | /* | |
2625 | * On a re-registration, we want to kick out the previous registration of | |
2626 | * that pid | |
2627 | */ | |
d0b96690 | 2628 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
2629 | |
2630 | /* | |
2631 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
2632 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
2633 | * already in the table. | |
2634 | */ | |
d0b96690 | 2635 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 2636 | |
d0b96690 DG |
2637 | /* Add application to the notify socket hash table. */ |
2638 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
2639 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 2640 | |
d0b96690 | 2641 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
2642 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
2643 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
2644 | app->v_minor); | |
5b4a0ec0 | 2645 | |
d0b96690 DG |
2646 | rcu_read_unlock(); |
2647 | } | |
2648 | ||
d88aee68 DG |
2649 | /* |
2650 | * Set the application version into the object. | |
2651 | * | |
2652 | * Return 0 on success else a negative value either an errno code or a | |
2653 | * LTTng-UST error code. | |
2654 | */ | |
d0b96690 DG |
2655 | int ust_app_version(struct ust_app *app) |
2656 | { | |
d88aee68 DG |
2657 | int ret; |
2658 | ||
d0b96690 | 2659 | assert(app); |
d88aee68 DG |
2660 | |
2661 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2662 | if (ret < 0) { | |
2663 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2664 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2665 | } else { | |
2666 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2667 | } | |
2668 | } | |
2669 | ||
2670 | return ret; | |
5b4a0ec0 DG |
2671 | } |
2672 | ||
2673 | /* | |
2674 | * Unregister app by removing it from the global traceable app list and freeing | |
2675 | * the data struct. | |
2676 | * | |
2677 | * The socket is already closed at this point so no close to sock. | |
2678 | */ | |
2679 | void ust_app_unregister(int sock) | |
2680 | { | |
2681 | struct ust_app *lta; | |
bec39940 DG |
2682 | struct lttng_ht_node_ulong *node; |
2683 | struct lttng_ht_iter iter; | |
d42f20df | 2684 | struct ust_app_session *ua_sess; |
525b0740 | 2685 | int ret; |
5b4a0ec0 DG |
2686 | |
2687 | rcu_read_lock(); | |
886459c6 | 2688 | |
5b4a0ec0 | 2689 | /* Get the node reference for a call_rcu */ |
852d0037 | 2690 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 2691 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 2692 | assert(node); |
284d8f55 | 2693 | |
852d0037 | 2694 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
2695 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
2696 | ||
886459c6 | 2697 | /* Remove application from PID hash table */ |
852d0037 DG |
2698 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
2699 | assert(!ret); | |
2700 | ||
d88aee68 DG |
2701 | /* |
2702 | * Remove application from notify hash table. The thread handling the | |
2703 | * notify socket could have deleted the node so ignore on error because | |
2704 | * either way it's valid. The close of that socket is handled by the other | |
2705 | * thread. | |
2706 | */ | |
d0b96690 | 2707 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 2708 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 2709 | |
5b98a774 DG |
2710 | /* |
2711 | * Ignore return value since the node might have been removed before by an | |
2712 | * add replace during app registration because the PID can be reassigned by | |
2713 | * the OS. | |
2714 | */ | |
d0b96690 | 2715 | iter.iter.node = <a->pid_n.node; |
bec39940 | 2716 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
2717 | if (ret) { |
2718 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
2719 | lta->pid); | |
2720 | } | |
852d0037 | 2721 | |
d42f20df DG |
2722 | /* Remove sessions so they are not visible during deletion.*/ |
2723 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
2724 | node.node) { | |
7972aab2 DG |
2725 | struct ust_registry_session *registry; |
2726 | ||
d42f20df DG |
2727 | ret = lttng_ht_del(lta->sessions, &iter); |
2728 | if (ret) { | |
2729 | /* The session was already removed so scheduled for teardown. */ | |
2730 | continue; | |
2731 | } | |
2732 | ||
2733 | /* | |
2734 | * Add session to list for teardown. This is safe since at this point we | |
2735 | * are the only one using this list. | |
2736 | */ | |
d88aee68 DG |
2737 | pthread_mutex_lock(&ua_sess->lock); |
2738 | ||
2739 | /* | |
2740 | * Normally, this is done in the delete session process which is | |
2741 | * executed in the call rcu below. However, upon registration we can't | |
2742 | * afford to wait for the grace period before pushing data or else the | |
2743 | * data pending feature can race between the unregistration and stop | |
2744 | * command where the data pending command is sent *before* the grace | |
2745 | * period ended. | |
2746 | * | |
2747 | * The close metadata below nullifies the metadata pointer in the | |
2748 | * session so the delete session will NOT push/close a second time. | |
2749 | */ | |
7972aab2 DG |
2750 | registry = get_session_registry(ua_sess); |
2751 | if (registry) { | |
2752 | /* Push metadata for application before freeing the application. */ | |
2753 | (void) push_metadata(registry, ua_sess->consumer); | |
2754 | ||
2755 | /* | |
2756 | * Don't ask to close metadata for global per UID buffers. Close | |
2757 | * metadata only on destroy trace session in this case. | |
2758 | */ | |
2759 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { | |
2760 | /* And ask to close it for this session registry. */ | |
2761 | (void) close_metadata(registry, ua_sess->consumer); | |
2762 | } | |
2763 | } | |
d88aee68 | 2764 | |
d42f20df | 2765 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 2766 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
2767 | } |
2768 | ||
852d0037 DG |
2769 | /* Free memory */ |
2770 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
2771 | ||
5b4a0ec0 DG |
2772 | rcu_read_unlock(); |
2773 | return; | |
284d8f55 DG |
2774 | } |
2775 | ||
2776 | /* | |
5b4a0ec0 | 2777 | * Return traceable_app_count |
284d8f55 | 2778 | */ |
5b4a0ec0 | 2779 | unsigned long ust_app_list_count(void) |
284d8f55 | 2780 | { |
5b4a0ec0 | 2781 | unsigned long count; |
284d8f55 | 2782 | |
5b4a0ec0 | 2783 | rcu_read_lock(); |
bec39940 | 2784 | count = lttng_ht_get_count(ust_app_ht); |
5b4a0ec0 | 2785 | rcu_read_unlock(); |
284d8f55 | 2786 | |
5b4a0ec0 | 2787 | return count; |
284d8f55 DG |
2788 | } |
2789 | ||
5b4a0ec0 DG |
2790 | /* |
2791 | * Fill events array with all events name of all registered apps. | |
2792 | */ | |
2793 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 2794 | { |
5b4a0ec0 DG |
2795 | int ret, handle; |
2796 | size_t nbmem, count = 0; | |
bec39940 | 2797 | struct lttng_ht_iter iter; |
5b4a0ec0 | 2798 | struct ust_app *app; |
c617c0c6 | 2799 | struct lttng_event *tmp_event; |
421cb601 | 2800 | |
5b4a0ec0 | 2801 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
2802 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
2803 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
2804 | PERROR("zmalloc ust app events"); |
2805 | ret = -ENOMEM; | |
421cb601 DG |
2806 | goto error; |
2807 | } | |
2808 | ||
5b4a0ec0 | 2809 | rcu_read_lock(); |
421cb601 | 2810 | |
852d0037 | 2811 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 2812 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 2813 | |
840cb59c | 2814 | health_code_update(); |
86acf0da | 2815 | |
e0c7ec2b DG |
2816 | if (!app->compatible) { |
2817 | /* | |
2818 | * TODO: In time, we should notice the caller of this error by | |
2819 | * telling him that this is a version error. | |
2820 | */ | |
2821 | continue; | |
2822 | } | |
852d0037 | 2823 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 2824 | if (handle < 0) { |
ffe60014 DG |
2825 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
2826 | ERR("UST app list events getting handle failed for app pid %d", | |
2827 | app->pid); | |
2828 | } | |
5b4a0ec0 DG |
2829 | continue; |
2830 | } | |
421cb601 | 2831 | |
852d0037 | 2832 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 2833 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
2834 | /* Handle ustctl error. */ |
2835 | if (ret < 0) { | |
2836 | free(tmp_event); | |
2837 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
2838 | ERR("UST app tp list get failed for app %d with ret %d", | |
2839 | app->sock, ret); | |
2840 | } else { | |
2841 | DBG3("UST app tp list get failed. Application is dead"); | |
2842 | } | |
2843 | goto rcu_error; | |
2844 | } | |
2845 | ||
840cb59c | 2846 | health_code_update(); |
815564d8 | 2847 | if (count >= nbmem) { |
d7b3776f | 2848 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
2849 | void *ptr; |
2850 | ||
815564d8 MD |
2851 | DBG2("Reallocating event list from %zu to %zu entries", nbmem, |
2852 | 2 * nbmem); | |
2853 | nbmem *= 2; | |
c617c0c6 MD |
2854 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event)); |
2855 | if (ptr == NULL) { | |
5b4a0ec0 | 2856 | PERROR("realloc ust app events"); |
c617c0c6 | 2857 | free(tmp_event); |
5b4a0ec0 DG |
2858 | ret = -ENOMEM; |
2859 | goto rcu_error; | |
2860 | } | |
c617c0c6 | 2861 | tmp_event = ptr; |
5b4a0ec0 | 2862 | } |
c617c0c6 MD |
2863 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
2864 | tmp_event[count].loglevel = uiter.loglevel; | |
2865 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
2866 | tmp_event[count].pid = app->pid; | |
2867 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 2868 | count++; |
421cb601 | 2869 | } |
421cb601 DG |
2870 | } |
2871 | ||
5b4a0ec0 | 2872 | ret = count; |
c617c0c6 | 2873 | *events = tmp_event; |
421cb601 | 2874 | |
5b4a0ec0 | 2875 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 2876 | |
5b4a0ec0 DG |
2877 | rcu_error: |
2878 | rcu_read_unlock(); | |
421cb601 | 2879 | error: |
840cb59c | 2880 | health_code_update(); |
5b4a0ec0 | 2881 | return ret; |
421cb601 DG |
2882 | } |
2883 | ||
f37d259d MD |
2884 | /* |
2885 | * Fill events array with all events name of all registered apps. | |
2886 | */ | |
2887 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
2888 | { | |
2889 | int ret, handle; | |
2890 | size_t nbmem, count = 0; | |
2891 | struct lttng_ht_iter iter; | |
2892 | struct ust_app *app; | |
c617c0c6 | 2893 | struct lttng_event_field *tmp_event; |
f37d259d MD |
2894 | |
2895 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
2896 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
2897 | if (tmp_event == NULL) { | |
f37d259d MD |
2898 | PERROR("zmalloc ust app event fields"); |
2899 | ret = -ENOMEM; | |
2900 | goto error; | |
2901 | } | |
2902 | ||
2903 | rcu_read_lock(); | |
2904 | ||
2905 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
2906 | struct lttng_ust_field_iter uiter; | |
2907 | ||
840cb59c | 2908 | health_code_update(); |
86acf0da | 2909 | |
f37d259d MD |
2910 | if (!app->compatible) { |
2911 | /* | |
2912 | * TODO: In time, we should notice the caller of this error by | |
2913 | * telling him that this is a version error. | |
2914 | */ | |
2915 | continue; | |
2916 | } | |
2917 | handle = ustctl_tracepoint_field_list(app->sock); | |
2918 | if (handle < 0) { | |
ffe60014 DG |
2919 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
2920 | ERR("UST app list field getting handle failed for app pid %d", | |
2921 | app->pid); | |
2922 | } | |
f37d259d MD |
2923 | continue; |
2924 | } | |
2925 | ||
2926 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 2927 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
2928 | /* Handle ustctl error. */ |
2929 | if (ret < 0) { | |
2930 | free(tmp_event); | |
2931 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
2932 | ERR("UST app tp list field failed for app %d with ret %d", | |
2933 | app->sock, ret); | |
2934 | } else { | |
2935 | DBG3("UST app tp list field failed. Application is dead"); | |
2936 | } | |
2937 | goto rcu_error; | |
2938 | } | |
2939 | ||
840cb59c | 2940 | health_code_update(); |
f37d259d | 2941 | if (count >= nbmem) { |
d7b3776f | 2942 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
2943 | void *ptr; |
2944 | ||
f37d259d MD |
2945 | DBG2("Reallocating event field list from %zu to %zu entries", nbmem, |
2946 | 2 * nbmem); | |
2947 | nbmem *= 2; | |
c617c0c6 MD |
2948 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field)); |
2949 | if (ptr == NULL) { | |
f37d259d | 2950 | PERROR("realloc ust app event fields"); |
c617c0c6 | 2951 | free(tmp_event); |
f37d259d MD |
2952 | ret = -ENOMEM; |
2953 | goto rcu_error; | |
2954 | } | |
c617c0c6 | 2955 | tmp_event = ptr; |
f37d259d | 2956 | } |
f37d259d | 2957 | |
c617c0c6 MD |
2958 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2959 | tmp_event[count].type = uiter.type; | |
2960 | tmp_event[count].nowrite = uiter.nowrite; | |
f37d259d | 2961 | |
c617c0c6 MD |
2962 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
2963 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2964 | tmp_event[count].event.type = LTTNG_UST_TRACEPOINT; | |
2965 | tmp_event[count].event.pid = app->pid; | |
2966 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
2967 | count++; |
2968 | } | |
2969 | } | |
2970 | ||
2971 | ret = count; | |
c617c0c6 | 2972 | *fields = tmp_event; |
f37d259d MD |
2973 | |
2974 | DBG2("UST app list event fields done (%zu events)", count); | |
2975 | ||
2976 | rcu_error: | |
2977 | rcu_read_unlock(); | |
2978 | error: | |
840cb59c | 2979 | health_code_update(); |
f37d259d MD |
2980 | return ret; |
2981 | } | |
2982 | ||
5b4a0ec0 DG |
2983 | /* |
2984 | * Free and clean all traceable apps of the global list. | |
2985 | */ | |
2986 | void ust_app_clean_list(void) | |
421cb601 | 2987 | { |
5b4a0ec0 | 2988 | int ret; |
659ed79f | 2989 | struct ust_app *app; |
bec39940 | 2990 | struct lttng_ht_iter iter; |
421cb601 | 2991 | |
5b4a0ec0 | 2992 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 2993 | |
5b4a0ec0 | 2994 | rcu_read_lock(); |
421cb601 | 2995 | |
659ed79f | 2996 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 2997 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 2998 | assert(!ret); |
659ed79f | 2999 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3000 | } |
3001 | ||
852d0037 | 3002 | /* Cleanup socket hash table */ |
659ed79f DG |
3003 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3004 | sock_n.node) { | |
852d0037 | 3005 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3006 | assert(!ret); |
3007 | } | |
852d0037 | 3008 | |
d88aee68 DG |
3009 | /* Cleanup notify socket hash table */ |
3010 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3011 | notify_sock_n.node) { | |
3012 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3013 | assert(!ret); | |
3014 | } | |
3015 | ||
bec39940 | 3016 | /* Destroy is done only when the ht is empty */ |
852d0037 DG |
3017 | lttng_ht_destroy(ust_app_ht); |
3018 | lttng_ht_destroy(ust_app_ht_by_sock); | |
d88aee68 | 3019 | lttng_ht_destroy(ust_app_ht_by_notify_sock); |
421cb601 | 3020 | |
5b4a0ec0 DG |
3021 | rcu_read_unlock(); |
3022 | } | |
3023 | ||
3024 | /* | |
3025 | * Init UST app hash table. | |
3026 | */ | |
3027 | void ust_app_ht_alloc(void) | |
3028 | { | |
bec39940 | 3029 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3030 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3031 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3032 | } |
3033 | ||
78f0bacd DG |
3034 | /* |
3035 | * For a specific UST session, disable the channel for all registered apps. | |
3036 | */ | |
35a9059d | 3037 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3038 | struct ltt_ust_channel *uchan) |
3039 | { | |
3040 | int ret = 0; | |
bec39940 DG |
3041 | struct lttng_ht_iter iter; |
3042 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3043 | struct ust_app *app; |
3044 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3045 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3046 | |
3047 | if (usess == NULL || uchan == NULL) { | |
3048 | ERR("Disabling UST global channel with NULL values"); | |
3049 | ret = -1; | |
3050 | goto error; | |
3051 | } | |
3052 | ||
a991f516 MD |
3053 | DBG2("UST app disabling channel %s from global domain for session id %d", |
3054 | uchan->name, usess->id); | |
78f0bacd DG |
3055 | |
3056 | rcu_read_lock(); | |
3057 | ||
3058 | /* For every registered applications */ | |
852d0037 | 3059 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3060 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3061 | if (!app->compatible) { |
3062 | /* | |
3063 | * TODO: In time, we should notice the caller of this error by | |
3064 | * telling him that this is a version error. | |
3065 | */ | |
3066 | continue; | |
3067 | } | |
78f0bacd DG |
3068 | ua_sess = lookup_session_by_app(usess, app); |
3069 | if (ua_sess == NULL) { | |
3070 | continue; | |
3071 | } | |
3072 | ||
8535a6d9 | 3073 | /* Get channel */ |
bec39940 DG |
3074 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3075 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3076 | /* If the session if found for the app, the channel must be there */ |
3077 | assert(ua_chan_node); | |
3078 | ||
3079 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3080 | /* The channel must not be already disabled */ | |
3081 | assert(ua_chan->enabled == 1); | |
3082 | ||
3083 | /* Disable channel onto application */ | |
3084 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3085 | if (ret < 0) { |
3086 | /* XXX: We might want to report this error at some point... */ | |
3087 | continue; | |
3088 | } | |
3089 | } | |
3090 | ||
3091 | rcu_read_unlock(); | |
3092 | ||
3093 | error: | |
3094 | return ret; | |
3095 | } | |
3096 | ||
3097 | /* | |
3098 | * For a specific UST session, enable the channel for all registered apps. | |
3099 | */ | |
35a9059d | 3100 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3101 | struct ltt_ust_channel *uchan) |
3102 | { | |
3103 | int ret = 0; | |
bec39940 | 3104 | struct lttng_ht_iter iter; |
78f0bacd DG |
3105 | struct ust_app *app; |
3106 | struct ust_app_session *ua_sess; | |
3107 | ||
3108 | if (usess == NULL || uchan == NULL) { | |
3109 | ERR("Adding UST global channel to NULL values"); | |
3110 | ret = -1; | |
3111 | goto error; | |
3112 | } | |
3113 | ||
a991f516 MD |
3114 | DBG2("UST app enabling channel %s to global domain for session id %d", |
3115 | uchan->name, usess->id); | |
78f0bacd DG |
3116 | |
3117 | rcu_read_lock(); | |
3118 | ||
3119 | /* For every registered applications */ | |
852d0037 | 3120 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3121 | if (!app->compatible) { |
3122 | /* | |
3123 | * TODO: In time, we should notice the caller of this error by | |
3124 | * telling him that this is a version error. | |
3125 | */ | |
3126 | continue; | |
3127 | } | |
78f0bacd DG |
3128 | ua_sess = lookup_session_by_app(usess, app); |
3129 | if (ua_sess == NULL) { | |
3130 | continue; | |
3131 | } | |
3132 | ||
3133 | /* Enable channel onto application */ | |
3134 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3135 | if (ret < 0) { | |
3136 | /* XXX: We might want to report this error at some point... */ | |
3137 | continue; | |
3138 | } | |
3139 | } | |
3140 | ||
3141 | rcu_read_unlock(); | |
3142 | ||
3143 | error: | |
3144 | return ret; | |
3145 | } | |
3146 | ||
b0a40d28 DG |
3147 | /* |
3148 | * Disable an event in a channel and for a specific session. | |
3149 | */ | |
35a9059d DG |
3150 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3151 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3152 | { |
3153 | int ret = 0; | |
bec39940 DG |
3154 | struct lttng_ht_iter iter, uiter; |
3155 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3156 | struct ust_app *app; |
3157 | struct ust_app_session *ua_sess; | |
3158 | struct ust_app_channel *ua_chan; | |
3159 | struct ust_app_event *ua_event; | |
3160 | ||
3161 | DBG("UST app disabling event %s for all apps in channel " | |
a991f516 | 3162 | "%s for session id %d", uevent->attr.name, uchan->name, usess->id); |
b0a40d28 DG |
3163 | |
3164 | rcu_read_lock(); | |
3165 | ||
3166 | /* For all registered applications */ | |
852d0037 | 3167 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3168 | if (!app->compatible) { |
3169 | /* | |
3170 | * TODO: In time, we should notice the caller of this error by | |
3171 | * telling him that this is a version error. | |
3172 | */ | |
3173 | continue; | |
3174 | } | |
b0a40d28 DG |
3175 | ua_sess = lookup_session_by_app(usess, app); |
3176 | if (ua_sess == NULL) { | |
3177 | /* Next app */ | |
3178 | continue; | |
3179 | } | |
3180 | ||
3181 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3182 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3183 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3184 | if (ua_chan_node == NULL) { |
a991f516 | 3185 | DBG2("Channel %s not found in session id %d for app pid %d." |
852d0037 | 3186 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3187 | continue; |
3188 | } | |
3189 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3190 | ||
bec39940 DG |
3191 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3192 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3193 | if (ua_event_node == NULL) { |
3194 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3195 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3196 | continue; |
3197 | } | |
3198 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3199 | ||
7f79d3a1 | 3200 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3201 | if (ret < 0) { |
3202 | /* XXX: Report error someday... */ | |
3203 | continue; | |
3204 | } | |
3205 | } | |
3206 | ||
3207 | rcu_read_unlock(); | |
3208 | ||
3209 | return ret; | |
3210 | } | |
3211 | ||
9730260e | 3212 | /* |
edb67388 | 3213 | * For a specific UST session and UST channel, the event for all |
9730260e DG |
3214 | * registered apps. |
3215 | */ | |
35a9059d | 3216 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
9730260e DG |
3217 | struct ltt_ust_channel *uchan) |
3218 | { | |
3219 | int ret = 0; | |
bec39940 DG |
3220 | struct lttng_ht_iter iter, uiter; |
3221 | struct lttng_ht_node_str *ua_chan_node; | |
9730260e DG |
3222 | struct ust_app *app; |
3223 | struct ust_app_session *ua_sess; | |
3224 | struct ust_app_channel *ua_chan; | |
3225 | struct ust_app_event *ua_event; | |
3226 | ||
3227 | DBG("UST app disabling all event for all apps in channel " | |
a991f516 | 3228 | "%s for session id %d", uchan->name, usess->id); |
9730260e DG |
3229 | |
3230 | rcu_read_lock(); | |
3231 | ||
3232 | /* For all registered applications */ | |
852d0037 | 3233 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3234 | if (!app->compatible) { |
3235 | /* | |
3236 | * TODO: In time, we should notice the caller of this error by | |
3237 | * telling him that this is a version error. | |
3238 | */ | |
3239 | continue; | |
3240 | } | |
9730260e | 3241 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3242 | if (!ua_sess) { |
3243 | /* The application has problem or is probably dead. */ | |
3244 | continue; | |
3245 | } | |
9730260e DG |
3246 | |
3247 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3248 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3249 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3250 | /* If the channel is not found, there is a code flow error */ |
3251 | assert(ua_chan_node); | |
3252 | ||
9730260e DG |
3253 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3254 | ||
3255 | /* Disable each events of channel */ | |
bec39940 DG |
3256 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3257 | node.node) { | |
7f79d3a1 | 3258 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
9730260e DG |
3259 | if (ret < 0) { |
3260 | /* XXX: Report error someday... */ | |
3261 | continue; | |
3262 | } | |
3263 | } | |
3264 | } | |
3265 | ||
3266 | rcu_read_unlock(); | |
3267 | ||
3268 | return ret; | |
3269 | } | |
3270 | ||
421cb601 | 3271 | /* |
5b4a0ec0 | 3272 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3273 | */ |
35a9059d | 3274 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3275 | struct ltt_ust_channel *uchan) |
3276 | { | |
3d8ca23b | 3277 | int ret = 0, created; |
bec39940 | 3278 | struct lttng_ht_iter iter; |
48842b30 | 3279 | struct ust_app *app; |
3d8ca23b | 3280 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3281 | |
fc34caaa DG |
3282 | /* Very wrong code flow */ |
3283 | assert(usess); | |
3284 | assert(uchan); | |
421cb601 | 3285 | |
7972aab2 | 3286 | DBG2("UST app adding channel %s to UST domain for session id %d", |
a991f516 | 3287 | uchan->name, usess->id); |
48842b30 DG |
3288 | |
3289 | rcu_read_lock(); | |
421cb601 | 3290 | |
5b4a0ec0 | 3291 | /* For every registered applications */ |
852d0037 | 3292 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3293 | if (!app->compatible) { |
3294 | /* | |
3295 | * TODO: In time, we should notice the caller of this error by | |
3296 | * telling him that this is a version error. | |
3297 | */ | |
3298 | continue; | |
3299 | } | |
edb67388 DG |
3300 | /* |
3301 | * Create session on the tracer side and add it to app session HT. Note | |
3302 | * that if session exist, it will simply return a pointer to the ust | |
3303 | * app session. | |
3304 | */ | |
3d8ca23b DG |
3305 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3306 | if (ret < 0) { | |
3307 | switch (ret) { | |
3308 | case -ENOTCONN: | |
3309 | /* | |
3310 | * The application's socket is not valid. Either a bad socket | |
3311 | * or a timeout on it. We can't inform the caller that for a | |
3312 | * specific app, the session failed so lets continue here. | |
3313 | */ | |
3314 | continue; | |
3315 | case -ENOMEM: | |
3316 | default: | |
3317 | goto error_rcu_unlock; | |
3318 | } | |
48842b30 | 3319 | } |
3d8ca23b | 3320 | assert(ua_sess); |
48842b30 | 3321 | |
d0b96690 | 3322 | pthread_mutex_lock(&ua_sess->lock); |
4d710ac2 | 3323 | /* Create channel onto application. We don't need the chan ref. */ |
7972aab2 DG |
3324 | ret = create_ust_app_channel(ua_sess, uchan, app, |
3325 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
d0b96690 | 3326 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3327 | if (ret < 0) { |
3328 | if (ret == -ENOMEM) { | |
3329 | /* No more memory is a fatal error. Stop right now. */ | |
3330 | goto error_rcu_unlock; | |
3331 | } | |
3332 | /* Cleanup the created session if it's the case. */ | |
3333 | if (created) { | |
d0b96690 | 3334 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3335 | } |
48842b30 | 3336 | } |
48842b30 | 3337 | } |
5b4a0ec0 | 3338 | |
95e047ff | 3339 | error_rcu_unlock: |
48842b30 | 3340 | rcu_read_unlock(); |
3c14c33f | 3341 | return ret; |
48842b30 DG |
3342 | } |
3343 | ||
5b4a0ec0 | 3344 | /* |
edb67388 | 3345 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3346 | */ |
35a9059d | 3347 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3348 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3349 | { | |
3350 | int ret = 0; | |
bec39940 | 3351 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3352 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3353 | struct ust_app *app; |
3354 | struct ust_app_session *ua_sess; | |
3355 | struct ust_app_channel *ua_chan; | |
3356 | struct ust_app_event *ua_event; | |
48842b30 | 3357 | |
a991f516 MD |
3358 | DBG("UST app enabling event %s for all apps for session id %d", |
3359 | uevent->attr.name, usess->id); | |
48842b30 | 3360 | |
edb67388 DG |
3361 | /* |
3362 | * NOTE: At this point, this function is called only if the session and | |
3363 | * channel passed are already created for all apps. and enabled on the | |
3364 | * tracer also. | |
3365 | */ | |
3366 | ||
48842b30 | 3367 | rcu_read_lock(); |
421cb601 DG |
3368 | |
3369 | /* For all registered applications */ | |
852d0037 | 3370 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3371 | if (!app->compatible) { |
3372 | /* | |
3373 | * TODO: In time, we should notice the caller of this error by | |
3374 | * telling him that this is a version error. | |
3375 | */ | |
3376 | continue; | |
3377 | } | |
edb67388 | 3378 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3379 | if (!ua_sess) { |
3380 | /* The application has problem or is probably dead. */ | |
3381 | continue; | |
3382 | } | |
ba767faf | 3383 | |
d0b96690 DG |
3384 | pthread_mutex_lock(&ua_sess->lock); |
3385 | ||
edb67388 | 3386 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3387 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3388 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3389 | /* If the channel is not found, there is a code flow error */ |
3390 | assert(ua_chan_node); | |
3391 | ||
3392 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3393 | ||
18eace3b DG |
3394 | /* Get event node */ |
3395 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
3396 | uevent->filter, uevent->attr.loglevel); | |
3397 | if (ua_event == NULL) { | |
7f79d3a1 | 3398 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3399 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3400 | goto next_app; |
35a9059d | 3401 | } |
35a9059d DG |
3402 | |
3403 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3404 | if (ret < 0) { | |
d0b96690 | 3405 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3406 | goto error; |
48842b30 | 3407 | } |
d0b96690 DG |
3408 | next_app: |
3409 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3410 | } |
3411 | ||
7f79d3a1 | 3412 | error: |
edb67388 | 3413 | rcu_read_unlock(); |
edb67388 DG |
3414 | return ret; |
3415 | } | |
3416 | ||
3417 | /* | |
3418 | * For a specific existing UST session and UST channel, creates the event for | |
3419 | * all registered apps. | |
3420 | */ | |
35a9059d | 3421 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3422 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3423 | { | |
3424 | int ret = 0; | |
bec39940 DG |
3425 | struct lttng_ht_iter iter, uiter; |
3426 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3427 | struct ust_app *app; |
3428 | struct ust_app_session *ua_sess; | |
3429 | struct ust_app_channel *ua_chan; | |
3430 | ||
a991f516 MD |
3431 | DBG("UST app creating event %s for all apps for session id %d", |
3432 | uevent->attr.name, usess->id); | |
edb67388 | 3433 | |
edb67388 DG |
3434 | rcu_read_lock(); |
3435 | ||
3436 | /* For all registered applications */ | |
852d0037 | 3437 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3438 | if (!app->compatible) { |
3439 | /* | |
3440 | * TODO: In time, we should notice the caller of this error by | |
3441 | * telling him that this is a version error. | |
3442 | */ | |
3443 | continue; | |
3444 | } | |
edb67388 | 3445 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3446 | if (!ua_sess) { |
3447 | /* The application has problem or is probably dead. */ | |
3448 | continue; | |
3449 | } | |
48842b30 | 3450 | |
d0b96690 | 3451 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3452 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3453 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3454 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3455 | /* If the channel is not found, there is a code flow error */ |
3456 | assert(ua_chan_node); | |
3457 | ||
48842b30 DG |
3458 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3459 | ||
edb67388 | 3460 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3461 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3462 | if (ret < 0) { |
49c336c1 | 3463 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3464 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3465 | break; | |
3466 | } | |
3467 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3468 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3469 | continue; |
48842b30 | 3470 | } |
48842b30 | 3471 | } |
5b4a0ec0 | 3472 | |
48842b30 DG |
3473 | rcu_read_unlock(); |
3474 | ||
3475 | return ret; | |
3476 | } | |
3477 | ||
5b4a0ec0 DG |
3478 | /* |
3479 | * Start tracing for a specific UST session and app. | |
3480 | */ | |
421cb601 | 3481 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3482 | { |
3483 | int ret = 0; | |
48842b30 | 3484 | struct ust_app_session *ua_sess; |
48842b30 | 3485 | |
852d0037 | 3486 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3487 | |
509cbaf8 MD |
3488 | rcu_read_lock(); |
3489 | ||
e0c7ec2b DG |
3490 | if (!app->compatible) { |
3491 | goto end; | |
3492 | } | |
3493 | ||
421cb601 DG |
3494 | ua_sess = lookup_session_by_app(usess, app); |
3495 | if (ua_sess == NULL) { | |
d42f20df DG |
3496 | /* The session is in teardown process. Ignore and continue. */ |
3497 | goto end; | |
421cb601 | 3498 | } |
48842b30 | 3499 | |
d0b96690 DG |
3500 | pthread_mutex_lock(&ua_sess->lock); |
3501 | ||
aea829b3 DG |
3502 | /* Upon restart, we skip the setup, already done */ |
3503 | if (ua_sess->started) { | |
8be98f9a | 3504 | goto skip_setup; |
aea829b3 | 3505 | } |
8be98f9a | 3506 | |
a4b92340 DG |
3507 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3508 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3509 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3510 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3511 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3512 | if (ret < 0) { |
3513 | if (ret != -EEXIST) { | |
3514 | ERR("Trace directory creation error"); | |
d0b96690 | 3515 | goto error_unlock; |
421cb601 | 3516 | } |
173af62f | 3517 | } |
7753dea8 | 3518 | } |
aea829b3 | 3519 | |
ffe60014 DG |
3520 | /* Create the metadata for the application. */ |
3521 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); | |
421cb601 | 3522 | if (ret < 0) { |
d0b96690 | 3523 | goto error_unlock; |
421cb601 | 3524 | } |
48842b30 | 3525 | |
840cb59c | 3526 | health_code_update(); |
86acf0da | 3527 | |
8be98f9a | 3528 | skip_setup: |
421cb601 | 3529 | /* This start the UST tracing */ |
852d0037 | 3530 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3531 | if (ret < 0) { |
ffe60014 DG |
3532 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3533 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3534 | app->pid, ret); | |
3535 | } else { | |
3536 | DBG("UST app start session failed. Application is dead."); | |
3537 | } | |
d0b96690 | 3538 | goto error_unlock; |
421cb601 | 3539 | } |
5b4a0ec0 | 3540 | |
55c3953d DG |
3541 | /* Indicate that the session has been started once */ |
3542 | ua_sess->started = 1; | |
3543 | ||
d0b96690 DG |
3544 | pthread_mutex_unlock(&ua_sess->lock); |
3545 | ||
840cb59c | 3546 | health_code_update(); |
86acf0da | 3547 | |
421cb601 | 3548 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3549 | ret = ustctl_wait_quiescent(app->sock); |
3550 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3551 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3552 | app->pid, ret); | |
3553 | } | |
48842b30 | 3554 | |
e0c7ec2b DG |
3555 | end: |
3556 | rcu_read_unlock(); | |
840cb59c | 3557 | health_code_update(); |
421cb601 | 3558 | return 0; |
48842b30 | 3559 | |
d0b96690 DG |
3560 | error_unlock: |
3561 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3562 | rcu_read_unlock(); |
840cb59c | 3563 | health_code_update(); |
421cb601 DG |
3564 | return -1; |
3565 | } | |
48842b30 | 3566 | |
8be98f9a MD |
3567 | /* |
3568 | * Stop tracing for a specific UST session and app. | |
3569 | */ | |
3570 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
3571 | { | |
3572 | int ret = 0; | |
bec39940 | 3573 | struct lttng_ht_iter iter; |
8be98f9a | 3574 | struct ust_app_session *ua_sess; |
6d3686da | 3575 | struct ust_app_channel *ua_chan; |
7972aab2 | 3576 | struct ust_registry_session *registry; |
8be98f9a | 3577 | |
852d0037 | 3578 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3579 | |
3580 | rcu_read_lock(); | |
3581 | ||
e0c7ec2b | 3582 | if (!app->compatible) { |
d88aee68 | 3583 | goto end_no_session; |
e0c7ec2b DG |
3584 | } |
3585 | ||
8be98f9a MD |
3586 | ua_sess = lookup_session_by_app(usess, app); |
3587 | if (ua_sess == NULL) { | |
d88aee68 | 3588 | goto end_no_session; |
8be98f9a MD |
3589 | } |
3590 | ||
d88aee68 DG |
3591 | pthread_mutex_lock(&ua_sess->lock); |
3592 | ||
9bc07046 DG |
3593 | /* |
3594 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3595 | * that was never started. It's possible since we can have a fail start |
3596 | * from either the application manager thread or the command thread. Simply | |
3597 | * indicate that this is a stop error. | |
9bc07046 | 3598 | */ |
f9dfc3d9 | 3599 | if (!ua_sess->started) { |
c45536e1 DG |
3600 | goto error_rcu_unlock; |
3601 | } | |
7db205b5 | 3602 | |
840cb59c | 3603 | health_code_update(); |
86acf0da | 3604 | |
9d6c7d3f | 3605 | /* This inhibits UST tracing */ |
852d0037 | 3606 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3607 | if (ret < 0) { |
ffe60014 DG |
3608 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3609 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3610 | app->pid, ret); | |
3611 | } else { | |
3612 | DBG("UST app stop session failed. Application is dead."); | |
3613 | } | |
9d6c7d3f DG |
3614 | goto error_rcu_unlock; |
3615 | } | |
3616 | ||
840cb59c | 3617 | health_code_update(); |
86acf0da | 3618 | |
9d6c7d3f | 3619 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3620 | ret = ustctl_wait_quiescent(app->sock); |
3621 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3622 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3623 | app->pid, ret); | |
3624 | } | |
9d6c7d3f | 3625 | |
840cb59c | 3626 | health_code_update(); |
86acf0da | 3627 | |
9d6c7d3f | 3628 | /* Flushing buffers */ |
bec39940 DG |
3629 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
3630 | node.node) { | |
840cb59c | 3631 | health_code_update(); |
ffe60014 | 3632 | assert(ua_chan->is_sent); |
852d0037 | 3633 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 3634 | if (ret < 0) { |
ffe60014 DG |
3635 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3636 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
3637 | app->pid, ua_chan->name, ret); | |
3638 | } else { | |
3639 | DBG3("UST app failed to flush %s. Application is dead.", | |
3640 | ua_chan->name); | |
3641 | /* No need to continue. */ | |
d88aee68 | 3642 | break; |
ffe60014 | 3643 | } |
6d3686da DG |
3644 | /* Continuing flushing all buffers */ |
3645 | continue; | |
8be98f9a MD |
3646 | } |
3647 | } | |
8be98f9a | 3648 | |
840cb59c | 3649 | health_code_update(); |
86acf0da | 3650 | |
7972aab2 DG |
3651 | registry = get_session_registry(ua_sess); |
3652 | assert(registry); | |
3653 | /* Push metadata for application before freeing the application. */ | |
3654 | (void) push_metadata(registry, ua_sess->consumer); | |
90d97d10 | 3655 | |
d88aee68 DG |
3656 | pthread_mutex_unlock(&ua_sess->lock); |
3657 | end_no_session: | |
7db205b5 | 3658 | rcu_read_unlock(); |
840cb59c | 3659 | health_code_update(); |
8be98f9a MD |
3660 | return 0; |
3661 | ||
3662 | error_rcu_unlock: | |
d88aee68 | 3663 | pthread_mutex_unlock(&ua_sess->lock); |
8be98f9a | 3664 | rcu_read_unlock(); |
840cb59c | 3665 | health_code_update(); |
8be98f9a MD |
3666 | return -1; |
3667 | } | |
3668 | ||
84cd17c6 MD |
3669 | /* |
3670 | * Destroy a specific UST session in apps. | |
3671 | */ | |
3353de95 | 3672 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 3673 | { |
ffe60014 | 3674 | int ret; |
84cd17c6 | 3675 | struct ust_app_session *ua_sess; |
bec39940 DG |
3676 | struct lttng_ht_iter iter; |
3677 | struct lttng_ht_node_ulong *node; | |
84cd17c6 | 3678 | |
852d0037 | 3679 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
3680 | |
3681 | rcu_read_lock(); | |
3682 | ||
e0c7ec2b DG |
3683 | if (!app->compatible) { |
3684 | goto end; | |
3685 | } | |
3686 | ||
84cd17c6 | 3687 | __lookup_session_by_app(usess, app, &iter); |
bec39940 | 3688 | node = lttng_ht_iter_get_node_ulong(&iter); |
84cd17c6 | 3689 | if (node == NULL) { |
d42f20df DG |
3690 | /* Session is being or is deleted. */ |
3691 | goto end; | |
84cd17c6 MD |
3692 | } |
3693 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 3694 | |
840cb59c | 3695 | health_code_update(); |
d0b96690 | 3696 | destroy_app_session(app, ua_sess); |
84cd17c6 | 3697 | |
840cb59c | 3698 | health_code_update(); |
7db205b5 | 3699 | |
84cd17c6 | 3700 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3701 | ret = ustctl_wait_quiescent(app->sock); |
3702 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3703 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3704 | app->pid, ret); | |
3705 | } | |
e0c7ec2b DG |
3706 | end: |
3707 | rcu_read_unlock(); | |
840cb59c | 3708 | health_code_update(); |
84cd17c6 | 3709 | return 0; |
84cd17c6 MD |
3710 | } |
3711 | ||
5b4a0ec0 DG |
3712 | /* |
3713 | * Start tracing for the UST session. | |
3714 | */ | |
421cb601 DG |
3715 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
3716 | { | |
3717 | int ret = 0; | |
bec39940 | 3718 | struct lttng_ht_iter iter; |
421cb601 | 3719 | struct ust_app *app; |
48842b30 | 3720 | |
421cb601 DG |
3721 | DBG("Starting all UST traces"); |
3722 | ||
3723 | rcu_read_lock(); | |
421cb601 | 3724 | |
852d0037 | 3725 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 3726 | ret = ust_app_start_trace(usess, app); |
48842b30 | 3727 | if (ret < 0) { |
5b4a0ec0 DG |
3728 | /* Continue to next apps even on error */ |
3729 | continue; | |
48842b30 | 3730 | } |
48842b30 | 3731 | } |
5b4a0ec0 | 3732 | |
48842b30 DG |
3733 | rcu_read_unlock(); |
3734 | ||
3735 | return 0; | |
3736 | } | |
487cf67c | 3737 | |
8be98f9a MD |
3738 | /* |
3739 | * Start tracing for the UST session. | |
3740 | */ | |
3741 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
3742 | { | |
3743 | int ret = 0; | |
bec39940 | 3744 | struct lttng_ht_iter iter; |
8be98f9a MD |
3745 | struct ust_app *app; |
3746 | ||
3747 | DBG("Stopping all UST traces"); | |
3748 | ||
3749 | rcu_read_lock(); | |
3750 | ||
7972aab2 DG |
3751 | /* Flush all per UID buffers associated to that session. */ |
3752 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
3753 | struct buffer_reg_uid *reg; | |
3754 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
3755 | struct buffer_reg_channel *reg_chan; | |
3756 | struct consumer_socket *socket; | |
3757 | ||
3758 | /* Get consumer socket to use to push the metadata.*/ | |
3759 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
3760 | usess->consumer); | |
3761 | if (!socket) { | |
3762 | /* Ignore request if no consumer is found for the session. */ | |
3763 | continue; | |
3764 | } | |
3765 | ||
3766 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
3767 | reg_chan, node.node) { | |
3768 | /* | |
3769 | * The following call will print error values so the return | |
3770 | * code is of little importance because whatever happens, we | |
3771 | * have to try them all. | |
3772 | */ | |
3773 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
3774 | } | |
3775 | } | |
3776 | } | |
3777 | ||
852d0037 | 3778 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
8be98f9a MD |
3779 | ret = ust_app_stop_trace(usess, app); |
3780 | if (ret < 0) { | |
3781 | /* Continue to next apps even on error */ | |
3782 | continue; | |
3783 | } | |
3784 | } | |
3785 | ||
3786 | rcu_read_unlock(); | |
3787 | ||
3788 | return 0; | |
3789 | } | |
3790 | ||
84cd17c6 MD |
3791 | /* |
3792 | * Destroy app UST session. | |
3793 | */ | |
3794 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
3795 | { | |
3796 | int ret = 0; | |
bec39940 | 3797 | struct lttng_ht_iter iter; |
84cd17c6 MD |
3798 | struct ust_app *app; |
3799 | ||
3800 | DBG("Destroy all UST traces"); | |
3801 | ||
3802 | rcu_read_lock(); | |
3803 | ||
852d0037 | 3804 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 3805 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
3806 | if (ret < 0) { |
3807 | /* Continue to next apps even on error */ | |
3808 | continue; | |
3809 | } | |
3810 | } | |
3811 | ||
3812 | rcu_read_unlock(); | |
3813 | ||
3814 | return 0; | |
3815 | } | |
3816 | ||
5b4a0ec0 DG |
3817 | /* |
3818 | * Add channels/events from UST global domain to registered apps at sock. | |
3819 | */ | |
487cf67c DG |
3820 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
3821 | { | |
55c54cce | 3822 | int ret = 0; |
727d5404 | 3823 | struct lttng_ht_iter iter, uiter, iter_ctx; |
487cf67c | 3824 | struct ust_app *app; |
3d8ca23b | 3825 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
3826 | struct ust_app_channel *ua_chan; |
3827 | struct ust_app_event *ua_event; | |
727d5404 | 3828 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 3829 | |
95e047ff | 3830 | assert(usess); |
ffe60014 | 3831 | assert(sock >= 0); |
1f3580c7 | 3832 | |
a991f516 MD |
3833 | DBG2("UST app global update for app sock %d for session id %d", sock, |
3834 | usess->id); | |
487cf67c | 3835 | |
284d8f55 DG |
3836 | rcu_read_lock(); |
3837 | ||
487cf67c DG |
3838 | app = find_app_by_sock(sock); |
3839 | if (app == NULL) { | |
d88aee68 DG |
3840 | /* |
3841 | * Application can be unregistered before so this is possible hence | |
3842 | * simply stopping the update. | |
3843 | */ | |
3844 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
3845 | goto error; |
3846 | } | |
3847 | ||
e0c7ec2b DG |
3848 | if (!app->compatible) { |
3849 | goto error; | |
3850 | } | |
3851 | ||
3d8ca23b DG |
3852 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
3853 | if (ret < 0) { | |
3854 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
3855 | goto error; |
3856 | } | |
3d8ca23b | 3857 | assert(ua_sess); |
487cf67c | 3858 | |
d0b96690 DG |
3859 | pthread_mutex_lock(&ua_sess->lock); |
3860 | ||
284d8f55 | 3861 | /* |
d0b96690 | 3862 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
3863 | * app session above made a shadow copy of the UST global domain from the |
3864 | * ltt ust session. | |
3865 | */ | |
bec39940 DG |
3866 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
3867 | node.node) { | |
7972aab2 | 3868 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
284d8f55 | 3869 | if (ret < 0) { |
ffe60014 DG |
3870 | /* |
3871 | * Stop everything. On error, the application failed, no more file | |
3872 | * descriptor are available or ENOMEM so stopping here is the only | |
3873 | * thing we can do for now. | |
3874 | */ | |
d0b96690 | 3875 | goto error_unlock; |
487cf67c DG |
3876 | } |
3877 | ||
727d5404 DG |
3878 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx, |
3879 | node.node) { | |
3880 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
3881 | if (ret < 0) { | |
d0b96690 | 3882 | goto error_unlock; |
727d5404 DG |
3883 | } |
3884 | } | |
3885 | ||
3886 | ||
284d8f55 | 3887 | /* For each events */ |
bec39940 DG |
3888 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3889 | node.node) { | |
284d8f55 DG |
3890 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
3891 | if (ret < 0) { | |
d0b96690 | 3892 | goto error_unlock; |
487cf67c | 3893 | } |
36dc12cc | 3894 | } |
487cf67c DG |
3895 | } |
3896 | ||
d0b96690 DG |
3897 | pthread_mutex_unlock(&ua_sess->lock); |
3898 | ||
36dc12cc | 3899 | if (usess->start_trace) { |
421cb601 | 3900 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 3901 | if (ret < 0) { |
36dc12cc DG |
3902 | goto error; |
3903 | } | |
3904 | ||
852d0037 | 3905 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
3906 | } |
3907 | ||
ffe60014 DG |
3908 | /* Everything went well at this point. */ |
3909 | rcu_read_unlock(); | |
3910 | return; | |
3911 | ||
d0b96690 DG |
3912 | error_unlock: |
3913 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 3914 | error: |
ffe60014 | 3915 | if (ua_sess) { |
d0b96690 | 3916 | destroy_app_session(app, ua_sess); |
ffe60014 | 3917 | } |
487cf67c DG |
3918 | rcu_read_unlock(); |
3919 | return; | |
3920 | } | |
55cc08a6 DG |
3921 | |
3922 | /* | |
3923 | * Add context to a specific channel for global UST domain. | |
3924 | */ | |
3925 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
3926 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
3927 | { | |
3928 | int ret = 0; | |
bec39940 DG |
3929 | struct lttng_ht_node_str *ua_chan_node; |
3930 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
3931 | struct ust_app_channel *ua_chan = NULL; |
3932 | struct ust_app_session *ua_sess; | |
3933 | struct ust_app *app; | |
3934 | ||
3935 | rcu_read_lock(); | |
3936 | ||
852d0037 | 3937 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3938 | if (!app->compatible) { |
3939 | /* | |
3940 | * TODO: In time, we should notice the caller of this error by | |
3941 | * telling him that this is a version error. | |
3942 | */ | |
3943 | continue; | |
3944 | } | |
55cc08a6 DG |
3945 | ua_sess = lookup_session_by_app(usess, app); |
3946 | if (ua_sess == NULL) { | |
3947 | continue; | |
3948 | } | |
3949 | ||
d0b96690 | 3950 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 3951 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3952 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3953 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 3954 | if (ua_chan_node == NULL) { |
d0b96690 | 3955 | goto next_app; |
55cc08a6 DG |
3956 | } |
3957 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
3958 | node); | |
55cc08a6 DG |
3959 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
3960 | if (ret < 0) { | |
d0b96690 | 3961 | goto next_app; |
55cc08a6 | 3962 | } |
d0b96690 DG |
3963 | next_app: |
3964 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
3965 | } |
3966 | ||
55cc08a6 DG |
3967 | rcu_read_unlock(); |
3968 | return ret; | |
3969 | } | |
3970 | ||
76d45b40 DG |
3971 | /* |
3972 | * Enable event for a channel from a UST session for a specific PID. | |
3973 | */ | |
3974 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
3975 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
3976 | { | |
3977 | int ret = 0; | |
bec39940 | 3978 | struct lttng_ht_iter iter; |
18eace3b | 3979 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
3980 | struct ust_app *app; |
3981 | struct ust_app_session *ua_sess; | |
3982 | struct ust_app_channel *ua_chan; | |
3983 | struct ust_app_event *ua_event; | |
3984 | ||
3985 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
3986 | ||
3987 | rcu_read_lock(); | |
3988 | ||
3989 | app = ust_app_find_by_pid(pid); | |
3990 | if (app == NULL) { | |
3991 | ERR("UST app enable event per PID %d not found", pid); | |
3992 | ret = -1; | |
d0b96690 | 3993 | goto end; |
76d45b40 DG |
3994 | } |
3995 | ||
e0c7ec2b DG |
3996 | if (!app->compatible) { |
3997 | ret = 0; | |
d0b96690 | 3998 | goto end; |
e0c7ec2b DG |
3999 | } |
4000 | ||
76d45b40 | 4001 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4002 | if (!ua_sess) { |
4003 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4004 | ret = 0; |
4005 | goto end; | |
c4a1715b | 4006 | } |
76d45b40 | 4007 | |
d0b96690 | 4008 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4009 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4010 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4011 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4012 | /* If the channel is not found, there is a code flow error */ |
4013 | assert(ua_chan_node); | |
4014 | ||
4015 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4016 | ||
18eace3b DG |
4017 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4018 | uevent->filter, uevent->attr.loglevel); | |
4019 | if (ua_event == NULL) { | |
76d45b40 DG |
4020 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4021 | if (ret < 0) { | |
d0b96690 | 4022 | goto end_unlock; |
76d45b40 DG |
4023 | } |
4024 | } else { | |
76d45b40 DG |
4025 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4026 | if (ret < 0) { | |
d0b96690 | 4027 | goto end_unlock; |
76d45b40 DG |
4028 | } |
4029 | } | |
4030 | ||
d0b96690 DG |
4031 | end_unlock: |
4032 | pthread_mutex_unlock(&ua_sess->lock); | |
4033 | end: | |
76d45b40 DG |
4034 | rcu_read_unlock(); |
4035 | return ret; | |
4036 | } | |
7f79d3a1 DG |
4037 | |
4038 | /* | |
4039 | * Disable event for a channel from a UST session for a specific PID. | |
4040 | */ | |
4041 | int ust_app_disable_event_pid(struct ltt_ust_session *usess, | |
4042 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4043 | { | |
4044 | int ret = 0; | |
bec39940 DG |
4045 | struct lttng_ht_iter iter; |
4046 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
7f79d3a1 DG |
4047 | struct ust_app *app; |
4048 | struct ust_app_session *ua_sess; | |
4049 | struct ust_app_channel *ua_chan; | |
4050 | struct ust_app_event *ua_event; | |
4051 | ||
4052 | DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); | |
4053 | ||
4054 | rcu_read_lock(); | |
4055 | ||
4056 | app = ust_app_find_by_pid(pid); | |
4057 | if (app == NULL) { | |
4058 | ERR("UST app disable event per PID %d not found", pid); | |
4059 | ret = -1; | |
4060 | goto error; | |
4061 | } | |
4062 | ||
e0c7ec2b DG |
4063 | if (!app->compatible) { |
4064 | ret = 0; | |
4065 | goto error; | |
4066 | } | |
4067 | ||
7f79d3a1 | 4068 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4069 | if (!ua_sess) { |
4070 | /* The application has problem or is probably dead. */ | |
4071 | goto error; | |
4072 | } | |
7f79d3a1 DG |
4073 | |
4074 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4075 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4076 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4077 | if (ua_chan_node == NULL) { |
4078 | /* Channel does not exist, skip disabling */ | |
4079 | goto error; | |
4080 | } | |
4081 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4082 | ||
bec39940 DG |
4083 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); |
4084 | ua_event_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4085 | if (ua_event_node == NULL) { |
4086 | /* Event does not exist, skip disabling */ | |
4087 | goto error; | |
4088 | } | |
4089 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
4090 | ||
4091 | ret = disable_ust_app_event(ua_sess, ua_event, app); | |
4092 | if (ret < 0) { | |
4093 | goto error; | |
4094 | } | |
4095 | ||
4096 | error: | |
4097 | rcu_read_unlock(); | |
4098 | return ret; | |
4099 | } | |
e0c7ec2b | 4100 | |
4466912f DG |
4101 | /* |
4102 | * Calibrate registered applications. | |
4103 | */ | |
4104 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4105 | { | |
4106 | int ret = 0; | |
4107 | struct lttng_ht_iter iter; | |
4108 | struct ust_app *app; | |
4109 | ||
4110 | rcu_read_lock(); | |
4111 | ||
852d0037 | 4112 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4113 | if (!app->compatible) { |
4114 | /* | |
4115 | * TODO: In time, we should notice the caller of this error by | |
4116 | * telling him that this is a version error. | |
4117 | */ | |
4118 | continue; | |
4119 | } | |
4120 | ||
840cb59c | 4121 | health_code_update(); |
86acf0da | 4122 | |
852d0037 | 4123 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4124 | if (ret < 0) { |
4125 | switch (ret) { | |
4126 | case -ENOSYS: | |
4127 | /* Means that it's not implemented on the tracer side. */ | |
4128 | ret = 0; | |
4129 | break; | |
4130 | default: | |
4466912f | 4131 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4132 | app->pid, ret); |
4466912f DG |
4133 | break; |
4134 | } | |
4135 | } | |
4136 | } | |
4137 | ||
4138 | DBG("UST app global domain calibration finished"); | |
4139 | ||
4140 | rcu_read_unlock(); | |
4141 | ||
840cb59c | 4142 | health_code_update(); |
86acf0da | 4143 | |
4466912f DG |
4144 | return ret; |
4145 | } | |
d0b96690 DG |
4146 | |
4147 | /* | |
4148 | * Receive registration and populate the given msg structure. | |
4149 | * | |
4150 | * On success return 0 else a negative value returned by the ustctl call. | |
4151 | */ | |
4152 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4153 | { | |
4154 | int ret; | |
4155 | uint32_t pid, ppid, uid, gid; | |
4156 | ||
4157 | assert(msg); | |
4158 | ||
4159 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4160 | &pid, &ppid, &uid, &gid, | |
4161 | &msg->bits_per_long, | |
4162 | &msg->uint8_t_alignment, | |
4163 | &msg->uint16_t_alignment, | |
4164 | &msg->uint32_t_alignment, | |
4165 | &msg->uint64_t_alignment, | |
4166 | &msg->long_alignment, | |
4167 | &msg->byte_order, | |
4168 | msg->name); | |
4169 | if (ret < 0) { | |
4170 | switch (-ret) { | |
4171 | case EPIPE: | |
4172 | case ECONNRESET: | |
4173 | case LTTNG_UST_ERR_EXITING: | |
4174 | DBG3("UST app recv reg message failed. Application died"); | |
4175 | break; | |
4176 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4177 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4178 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4179 | LTTNG_UST_ABI_MINOR_VERSION); | |
4180 | break; | |
4181 | default: | |
4182 | ERR("UST app recv reg message failed with ret %d", ret); | |
4183 | break; | |
4184 | } | |
4185 | goto error; | |
4186 | } | |
4187 | msg->pid = (pid_t) pid; | |
4188 | msg->ppid = (pid_t) ppid; | |
4189 | msg->uid = (uid_t) uid; | |
4190 | msg->gid = (gid_t) gid; | |
4191 | ||
4192 | error: | |
4193 | return ret; | |
4194 | } | |
4195 | ||
d88aee68 DG |
4196 | /* |
4197 | * Return a ust app channel object using the application object and the channel | |
4198 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4199 | * lock MUST be acquired before calling this function. | |
4200 | */ | |
d0b96690 DG |
4201 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4202 | int objd) | |
4203 | { | |
4204 | struct lttng_ht_node_ulong *node; | |
4205 | struct lttng_ht_iter iter; | |
4206 | struct ust_app_channel *ua_chan = NULL; | |
4207 | ||
4208 | assert(app); | |
4209 | ||
4210 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4211 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4212 | if (node == NULL) { | |
4213 | DBG2("UST app channel find by objd %d not found", objd); | |
4214 | goto error; | |
4215 | } | |
4216 | ||
4217 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4218 | ||
4219 | error: | |
4220 | return ua_chan; | |
4221 | } | |
4222 | ||
d88aee68 DG |
4223 | /* |
4224 | * Reply to a register channel notification from an application on the notify | |
4225 | * socket. The channel metadata is also created. | |
4226 | * | |
4227 | * The session UST registry lock is acquired in this function. | |
4228 | * | |
4229 | * On success 0 is returned else a negative value. | |
4230 | */ | |
d0b96690 DG |
4231 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4232 | size_t nr_fields, struct ustctl_field *fields) | |
4233 | { | |
4234 | int ret, ret_code = 0; | |
4235 | uint32_t chan_id, reg_count; | |
7972aab2 | 4236 | uint64_t chan_reg_key; |
d0b96690 DG |
4237 | enum ustctl_channel_header type; |
4238 | struct ust_app *app; | |
4239 | struct ust_app_channel *ua_chan; | |
4240 | struct ust_app_session *ua_sess; | |
7972aab2 | 4241 | struct ust_registry_session *registry; |
45893984 | 4242 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4243 | |
4244 | rcu_read_lock(); | |
4245 | ||
4246 | /* Lookup application. If not found, there is a code flow error. */ | |
4247 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4248 | if (!app) { |
4249 | DBG("Application socket %d is being teardown. Abort event notify", | |
4250 | sock); | |
4251 | ret = 0; | |
4252 | goto error_rcu_unlock; | |
4253 | } | |
d0b96690 DG |
4254 | |
4255 | /* Lookup channel by UST object descriptor. Should always be found. */ | |
4256 | ua_chan = find_channel_by_objd(app, cobjd); | |
4257 | assert(ua_chan); | |
4258 | assert(ua_chan->session); | |
4259 | ua_sess = ua_chan->session; | |
d0b96690 | 4260 | |
7972aab2 DG |
4261 | /* Get right session registry depending on the session buffer type. */ |
4262 | registry = get_session_registry(ua_sess); | |
4263 | assert(registry); | |
45893984 | 4264 | |
7972aab2 DG |
4265 | /* Depending on the buffer type, a different channel key is used. */ |
4266 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4267 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4268 | } else { |
7972aab2 | 4269 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4270 | } |
4271 | ||
7972aab2 DG |
4272 | pthread_mutex_lock(®istry->lock); |
4273 | ||
4274 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4275 | assert(chan_reg); | |
4276 | ||
4277 | if (!chan_reg->register_done) { | |
4278 | reg_count = ust_registry_get_event_count(chan_reg); | |
4279 | if (reg_count < 31) { | |
4280 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4281 | } else { | |
4282 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4283 | } | |
4284 | ||
4285 | chan_reg->nr_ctx_fields = nr_fields; | |
4286 | chan_reg->ctx_fields = fields; | |
4287 | chan_reg->header_type = type; | |
d0b96690 | 4288 | } else { |
7972aab2 DG |
4289 | /* Get current already assigned values. */ |
4290 | type = chan_reg->header_type; | |
d0b96690 | 4291 | } |
7972aab2 DG |
4292 | /* Channel id is set during the object creation. */ |
4293 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4294 | |
4295 | /* Append to metadata */ | |
7972aab2 DG |
4296 | if (!chan_reg->metadata_dumped) { |
4297 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4298 | if (ret_code) { |
4299 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4300 | goto reply; | |
4301 | } | |
4302 | } | |
4303 | ||
4304 | reply: | |
7972aab2 DG |
4305 | DBG3("UST app replying to register channel key %" PRIu64 |
4306 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4307 | ret_code); | |
d0b96690 DG |
4308 | |
4309 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4310 | if (ret < 0) { | |
4311 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4312 | ERR("UST app reply channel failed with ret %d", ret); | |
4313 | } else { | |
4314 | DBG3("UST app reply channel failed. Application died"); | |
4315 | } | |
4316 | goto error; | |
4317 | } | |
4318 | ||
7972aab2 DG |
4319 | /* This channel registry registration is completed. */ |
4320 | chan_reg->register_done = 1; | |
4321 | ||
d0b96690 | 4322 | error: |
7972aab2 | 4323 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4324 | error_rcu_unlock: |
d0b96690 DG |
4325 | rcu_read_unlock(); |
4326 | return ret; | |
4327 | } | |
4328 | ||
d88aee68 DG |
4329 | /* |
4330 | * Add event to the UST channel registry. When the event is added to the | |
4331 | * registry, the metadata is also created. Once done, this replies to the | |
4332 | * application with the appropriate error code. | |
4333 | * | |
4334 | * The session UST registry lock is acquired in the function. | |
4335 | * | |
4336 | * On success 0 is returned else a negative value. | |
4337 | */ | |
d0b96690 DG |
4338 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4339 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4340 | char *model_emf_uri) | |
4341 | { | |
4342 | int ret, ret_code; | |
4343 | uint32_t event_id = 0; | |
7972aab2 | 4344 | uint64_t chan_reg_key; |
d0b96690 DG |
4345 | struct ust_app *app; |
4346 | struct ust_app_channel *ua_chan; | |
4347 | struct ust_app_session *ua_sess; | |
7972aab2 | 4348 | struct ust_registry_session *registry; |
d0b96690 DG |
4349 | |
4350 | rcu_read_lock(); | |
4351 | ||
4352 | /* Lookup application. If not found, there is a code flow error. */ | |
4353 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4354 | if (!app) { |
4355 | DBG("Application socket %d is being teardown. Abort event notify", | |
4356 | sock); | |
4357 | ret = 0; | |
4358 | goto error_rcu_unlock; | |
4359 | } | |
d0b96690 DG |
4360 | |
4361 | /* Lookup channel by UST object descriptor. Should always be found. */ | |
4362 | ua_chan = find_channel_by_objd(app, cobjd); | |
4363 | assert(ua_chan); | |
4364 | assert(ua_chan->session); | |
4365 | ua_sess = ua_chan->session; | |
4366 | ||
7972aab2 DG |
4367 | registry = get_session_registry(ua_sess); |
4368 | assert(registry); | |
4369 | ||
4370 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4371 | chan_reg_key = ua_chan->tracing_channel_id; | |
4372 | } else { | |
4373 | chan_reg_key = ua_chan->key; | |
4374 | } | |
4375 | ||
4376 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4377 | |
7972aab2 | 4378 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4379 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
7972aab2 | 4380 | model_emf_uri, ua_sess->buffer_type, &event_id); |
d0b96690 DG |
4381 | |
4382 | /* | |
4383 | * The return value is returned to ustctl so in case of an error, the | |
4384 | * application can be notified. In case of an error, it's important not to | |
4385 | * return a negative error or else the application will get closed. | |
4386 | */ | |
4387 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4388 | if (ret < 0) { | |
4389 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4390 | ERR("UST app reply event failed with ret %d", ret); | |
4391 | } else { | |
4392 | DBG3("UST app reply event failed. Application died"); | |
4393 | } | |
4394 | /* | |
4395 | * No need to wipe the create event since the application socket will | |
4396 | * get close on error hence cleaning up everything by itself. | |
4397 | */ | |
4398 | goto error; | |
4399 | } | |
4400 | ||
7972aab2 DG |
4401 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4402 | name, event_id); | |
d88aee68 | 4403 | |
d0b96690 | 4404 | error: |
7972aab2 | 4405 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4406 | error_rcu_unlock: |
d0b96690 DG |
4407 | rcu_read_unlock(); |
4408 | return ret; | |
4409 | } | |
4410 | ||
d88aee68 DG |
4411 | /* |
4412 | * Handle application notification through the given notify socket. | |
4413 | * | |
4414 | * Return 0 on success or else a negative value. | |
4415 | */ | |
d0b96690 DG |
4416 | int ust_app_recv_notify(int sock) |
4417 | { | |
4418 | int ret; | |
4419 | enum ustctl_notify_cmd cmd; | |
4420 | ||
4421 | DBG3("UST app receiving notify from sock %d", sock); | |
4422 | ||
4423 | ret = ustctl_recv_notify(sock, &cmd); | |
4424 | if (ret < 0) { | |
4425 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4426 | ERR("UST app recv notify failed with ret %d", ret); | |
4427 | } else { | |
4428 | DBG3("UST app recv notify failed. Application died"); | |
4429 | } | |
4430 | goto error; | |
4431 | } | |
4432 | ||
4433 | switch (cmd) { | |
4434 | case USTCTL_NOTIFY_CMD_EVENT: | |
4435 | { | |
4436 | int sobjd, cobjd, loglevel; | |
4437 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4438 | size_t nr_fields; | |
4439 | struct ustctl_field *fields; | |
4440 | ||
4441 | DBG2("UST app ustctl register event received"); | |
4442 | ||
4443 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4444 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4445 | if (ret < 0) { | |
4446 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4447 | ERR("UST app recv event failed with ret %d", ret); | |
4448 | } else { | |
4449 | DBG3("UST app recv event failed. Application died"); | |
4450 | } | |
4451 | goto error; | |
4452 | } | |
4453 | ||
4454 | /* Add event to the UST registry coming from the notify socket. */ | |
4455 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, | |
4456 | fields, loglevel, model_emf_uri); | |
4457 | if (ret < 0) { | |
4458 | goto error; | |
4459 | } | |
4460 | ||
4461 | break; | |
4462 | } | |
4463 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4464 | { | |
4465 | int sobjd, cobjd; | |
4466 | size_t nr_fields; | |
4467 | struct ustctl_field *fields; | |
4468 | ||
4469 | DBG2("UST app ustctl register channel received"); | |
4470 | ||
4471 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4472 | &fields); | |
4473 | if (ret < 0) { | |
4474 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4475 | ERR("UST app recv channel failed with ret %d", ret); | |
4476 | } else { | |
4477 | DBG3("UST app recv channel failed. Application died"); | |
4478 | } | |
4479 | goto error; | |
4480 | } | |
4481 | ||
4482 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, | |
4483 | fields); | |
4484 | if (ret < 0) { | |
4485 | goto error; | |
4486 | } | |
4487 | ||
4488 | break; | |
4489 | } | |
4490 | default: | |
4491 | /* Should NEVER happen. */ | |
4492 | assert(0); | |
4493 | } | |
4494 | ||
4495 | error: | |
4496 | return ret; | |
4497 | } | |
d88aee68 DG |
4498 | |
4499 | /* | |
4500 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4501 | * corresponding application. On failure, the call_rcu to close the socket is | |
4502 | * executed. If an application is found, it tries to delete it from the notify | |
4503 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4504 | * | |
4505 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4506 | * call RCU is not done but the rest of the cleanup is. | |
4507 | */ | |
4508 | void ust_app_notify_sock_unregister(int sock) | |
4509 | { | |
4510 | int err_enomem = 0; | |
4511 | struct lttng_ht_iter iter; | |
4512 | struct ust_app *app; | |
4513 | struct ust_app_notify_sock_obj *obj; | |
4514 | ||
4515 | assert(sock >= 0); | |
4516 | ||
4517 | rcu_read_lock(); | |
4518 | ||
4519 | obj = zmalloc(sizeof(*obj)); | |
4520 | if (!obj) { | |
4521 | /* | |
4522 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4523 | * procedure but the call_rcu will not be called. In this case, we | |
4524 | * accept the fd leak rather than possibly creating an unsynchronized | |
4525 | * state between threads. | |
4526 | * | |
4527 | * TODO: The notify object should be created once the notify socket is | |
4528 | * registered and stored independantely from the ust app object. The | |
4529 | * tricky part is to synchronize the teardown of the application and | |
4530 | * this notify object. Let's keep that in mind so we can avoid this | |
4531 | * kind of shenanigans with ENOMEM in the teardown path. | |
4532 | */ | |
4533 | err_enomem = 1; | |
4534 | } else { | |
4535 | obj->fd = sock; | |
4536 | } | |
4537 | ||
4538 | DBG("UST app notify socket unregister %d", sock); | |
4539 | ||
4540 | /* | |
4541 | * Lookup application by notify socket. If this fails, this means that the | |
4542 | * hash table delete has already been done by the application | |
4543 | * unregistration process so we can safely close the notify socket in a | |
4544 | * call RCU. | |
4545 | */ | |
4546 | app = find_app_by_notify_sock(sock); | |
4547 | if (!app) { | |
4548 | goto close_socket; | |
4549 | } | |
4550 | ||
4551 | iter.iter.node = &app->notify_sock_n.node; | |
4552 | ||
4553 | /* | |
4554 | * Whatever happens here either we fail or succeed, in both cases we have | |
4555 | * to close the socket after a grace period to continue to the call RCU | |
4556 | * here. If the deletion is successful, the application is not visible | |
4557 | * anymore by other threads and is it fails it means that it was already | |
4558 | * deleted from the hash table so either way we just have to close the | |
4559 | * socket. | |
4560 | */ | |
4561 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4562 | ||
4563 | close_socket: | |
4564 | rcu_read_unlock(); | |
4565 | ||
4566 | /* | |
4567 | * Close socket after a grace period to avoid for the socket to be reused | |
4568 | * before the application object is freed creating potential race between | |
4569 | * threads trying to add unique in the global hash table. | |
4570 | */ | |
4571 | if (!err_enomem) { | |
4572 | call_rcu(&obj->head, close_notify_sock_rcu); | |
4573 | } | |
4574 | } |