Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
91d76f53 DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
16 | */ |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <errno.h> | |
7972aab2 | 20 | #include <inttypes.h> |
91d76f53 DG |
21 | #include <pthread.h> |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
099e26bd | 24 | #include <string.h> |
aba8e916 DG |
25 | #include <sys/stat.h> |
26 | #include <sys/types.h> | |
099e26bd | 27 | #include <unistd.h> |
0df502fd | 28 | #include <urcu/compiler.h> |
fb54cdbf | 29 | #include <lttng/ust-error.h> |
331744e3 | 30 | #include <signal.h> |
bec39940 | 31 | |
990570ed | 32 | #include <common/common.h> |
86acf0da | 33 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 34 | |
7972aab2 | 35 | #include "buffer-registry.h" |
86acf0da DG |
36 | #include "fd-limit.h" |
37 | #include "health.h" | |
56fff090 | 38 | #include "ust-app.h" |
48842b30 | 39 | #include "ust-consumer.h" |
d80a6244 DG |
40 | #include "ust-ctl.h" |
41 | ||
ffe60014 DG |
42 | /* Next available channel key. */ |
43 | static unsigned long next_channel_key; | |
7972aab2 | 44 | static unsigned long next_session_id; |
ffe60014 DG |
45 | |
46 | /* | |
47 | * Return the atomically incremented value of next_channel_key. | |
48 | */ | |
49 | static inline unsigned long get_next_channel_key(void) | |
50 | { | |
51 | return uatomic_add_return(&next_channel_key, 1); | |
52 | } | |
53 | ||
54 | /* | |
7972aab2 | 55 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 56 | */ |
7972aab2 | 57 | static inline unsigned long get_next_session_id(void) |
ffe60014 | 58 | { |
7972aab2 | 59 | return uatomic_add_return(&next_session_id, 1); |
ffe60014 DG |
60 | } |
61 | ||
d65d2de8 DG |
62 | static void copy_channel_attr_to_ustctl( |
63 | struct ustctl_consumer_channel_attr *attr, | |
64 | struct lttng_ust_channel_attr *uattr) | |
65 | { | |
66 | /* Copy event attributes since the layout is different. */ | |
67 | attr->subbuf_size = uattr->subbuf_size; | |
68 | attr->num_subbuf = uattr->num_subbuf; | |
69 | attr->overwrite = uattr->overwrite; | |
70 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
71 | attr->read_timer_interval = uattr->read_timer_interval; | |
72 | attr->output = uattr->output; | |
73 | } | |
74 | ||
025faf73 DG |
75 | /* |
76 | * Match function for the hash table lookup. | |
77 | * | |
78 | * It matches an ust app event based on three attributes which are the event | |
79 | * name, the filter bytecode and the loglevel. | |
80 | */ | |
18eace3b DG |
81 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
82 | { | |
83 | struct ust_app_event *event; | |
84 | const struct ust_app_ht_key *key; | |
85 | ||
86 | assert(node); | |
87 | assert(_key); | |
88 | ||
89 | event = caa_container_of(node, struct ust_app_event, node.node); | |
90 | key = _key; | |
91 | ||
92 | /* Match the 3 elements of the key: name, filter and loglevel. */ | |
93 | ||
94 | /* Event name */ | |
95 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
96 | goto no_match; | |
97 | } | |
98 | ||
99 | /* Event loglevel. */ | |
100 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
101 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
102 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
103 | /* | |
104 | * Match is accepted. This is because on event creation, the | |
105 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
106 | * -1 are accepted for this loglevel type since 0 is the one set by | |
107 | * the API when receiving an enable event. | |
108 | */ | |
109 | } else { | |
110 | goto no_match; | |
111 | } | |
18eace3b DG |
112 | } |
113 | ||
114 | /* One of the filters is NULL, fail. */ | |
115 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
116 | goto no_match; | |
117 | } | |
118 | ||
025faf73 DG |
119 | if (key->filter && event->filter) { |
120 | /* Both filters exists, check length followed by the bytecode. */ | |
121 | if (event->filter->len != key->filter->len || | |
122 | memcmp(event->filter->data, key->filter->data, | |
123 | event->filter->len) != 0) { | |
124 | goto no_match; | |
125 | } | |
18eace3b DG |
126 | } |
127 | ||
025faf73 | 128 | /* Match. */ |
18eace3b DG |
129 | return 1; |
130 | ||
131 | no_match: | |
132 | return 0; | |
18eace3b DG |
133 | } |
134 | ||
025faf73 DG |
135 | /* |
136 | * Unique add of an ust app event in the given ht. This uses the custom | |
137 | * ht_match_ust_app_event match function and the event name as hash. | |
138 | */ | |
d0b96690 | 139 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
140 | struct ust_app_event *event) |
141 | { | |
142 | struct cds_lfht_node *node_ptr; | |
143 | struct ust_app_ht_key key; | |
d0b96690 | 144 | struct lttng_ht *ht; |
18eace3b | 145 | |
d0b96690 DG |
146 | assert(ua_chan); |
147 | assert(ua_chan->events); | |
18eace3b DG |
148 | assert(event); |
149 | ||
d0b96690 | 150 | ht = ua_chan->events; |
18eace3b DG |
151 | key.name = event->attr.name; |
152 | key.filter = event->filter; | |
153 | key.loglevel = event->attr.loglevel; | |
154 | ||
155 | node_ptr = cds_lfht_add_unique(ht->ht, | |
156 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
157 | ht_match_ust_app_event, &key, &event->node.node); | |
158 | assert(node_ptr == &event->node.node); | |
159 | } | |
160 | ||
d88aee68 DG |
161 | /* |
162 | * Close the notify socket from the given RCU head object. This MUST be called | |
163 | * through a call_rcu(). | |
164 | */ | |
165 | static void close_notify_sock_rcu(struct rcu_head *head) | |
166 | { | |
167 | int ret; | |
168 | struct ust_app_notify_sock_obj *obj = | |
169 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
170 | ||
171 | /* Must have a valid fd here. */ | |
172 | assert(obj->fd >= 0); | |
173 | ||
174 | ret = close(obj->fd); | |
175 | if (ret) { | |
176 | ERR("close notify sock %d RCU", obj->fd); | |
177 | } | |
178 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
179 | ||
180 | free(obj); | |
181 | } | |
182 | ||
7972aab2 DG |
183 | /* |
184 | * Return the session registry according to the buffer type of the given | |
185 | * session. | |
186 | * | |
187 | * A registry per UID object MUST exists before calling this function or else | |
188 | * it assert() if not found. RCU read side lock must be acquired. | |
189 | */ | |
190 | static struct ust_registry_session *get_session_registry( | |
191 | struct ust_app_session *ua_sess) | |
192 | { | |
193 | struct ust_registry_session *registry = NULL; | |
194 | ||
195 | assert(ua_sess); | |
196 | ||
197 | switch (ua_sess->buffer_type) { | |
198 | case LTTNG_BUFFER_PER_PID: | |
199 | { | |
200 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
201 | if (!reg_pid) { | |
202 | goto error; | |
203 | } | |
204 | registry = reg_pid->registry->reg.ust; | |
205 | break; | |
206 | } | |
207 | case LTTNG_BUFFER_PER_UID: | |
208 | { | |
209 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
210 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
211 | if (!reg_uid) { | |
212 | goto error; | |
213 | } | |
214 | registry = reg_uid->registry->reg.ust; | |
215 | break; | |
216 | } | |
217 | default: | |
218 | assert(0); | |
219 | }; | |
220 | ||
221 | error: | |
222 | return registry; | |
223 | } | |
224 | ||
55cc08a6 DG |
225 | /* |
226 | * Delete ust context safely. RCU read lock must be held before calling | |
227 | * this function. | |
228 | */ | |
229 | static | |
230 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
231 | { | |
ffe60014 DG |
232 | int ret; |
233 | ||
234 | assert(ua_ctx); | |
235 | ||
55cc08a6 | 236 | if (ua_ctx->obj) { |
ffe60014 | 237 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
238 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
239 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
240 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 241 | } |
55cc08a6 DG |
242 | free(ua_ctx->obj); |
243 | } | |
244 | free(ua_ctx); | |
245 | } | |
246 | ||
d80a6244 DG |
247 | /* |
248 | * Delete ust app event safely. RCU read lock must be held before calling | |
249 | * this function. | |
250 | */ | |
8b366481 DG |
251 | static |
252 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 253 | { |
ffe60014 DG |
254 | int ret; |
255 | ||
256 | assert(ua_event); | |
257 | ||
53a80697 | 258 | free(ua_event->filter); |
d80a6244 | 259 | |
edb67388 | 260 | if (ua_event->obj != NULL) { |
ffe60014 DG |
261 | ret = ustctl_release_object(sock, ua_event->obj); |
262 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
263 | ERR("UST app sock %d release event obj failed with ret %d", | |
264 | sock, ret); | |
265 | } | |
edb67388 DG |
266 | free(ua_event->obj); |
267 | } | |
d80a6244 DG |
268 | free(ua_event); |
269 | } | |
270 | ||
271 | /* | |
7972aab2 DG |
272 | * Release ust data object of the given stream. |
273 | * | |
274 | * Return 0 on success or else a negative value. | |
d80a6244 | 275 | */ |
7972aab2 | 276 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 277 | { |
7972aab2 | 278 | int ret = 0; |
ffe60014 DG |
279 | |
280 | assert(stream); | |
281 | ||
8b366481 | 282 | if (stream->obj) { |
ffe60014 DG |
283 | ret = ustctl_release_object(sock, stream->obj); |
284 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
285 | ERR("UST app sock %d release stream obj failed with ret %d", | |
286 | sock, ret); | |
287 | } | |
4063050c | 288 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
289 | free(stream->obj); |
290 | } | |
7972aab2 DG |
291 | |
292 | return ret; | |
293 | } | |
294 | ||
295 | /* | |
296 | * Delete ust app stream safely. RCU read lock must be held before calling | |
297 | * this function. | |
298 | */ | |
299 | static | |
300 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
301 | { | |
302 | assert(stream); | |
303 | ||
304 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 305 | free(stream); |
d80a6244 DG |
306 | } |
307 | ||
308 | /* | |
309 | * Delete ust app channel safely. RCU read lock must be held before calling | |
310 | * this function. | |
311 | */ | |
8b366481 | 312 | static |
d0b96690 DG |
313 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
314 | struct ust_app *app) | |
d80a6244 DG |
315 | { |
316 | int ret; | |
bec39940 | 317 | struct lttng_ht_iter iter; |
d80a6244 | 318 | struct ust_app_event *ua_event; |
55cc08a6 | 319 | struct ust_app_ctx *ua_ctx; |
030a66fa | 320 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 321 | struct ust_registry_session *registry; |
d80a6244 | 322 | |
ffe60014 DG |
323 | assert(ua_chan); |
324 | ||
325 | DBG3("UST app deleting channel %s", ua_chan->name); | |
326 | ||
55cc08a6 | 327 | /* Wipe stream */ |
d80a6244 | 328 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 329 | cds_list_del(&stream->list); |
d80a6244 DG |
330 | delete_ust_app_stream(sock, stream); |
331 | } | |
332 | ||
55cc08a6 | 333 | /* Wipe context */ |
bec39940 DG |
334 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
335 | ret = lttng_ht_del(ua_chan->ctx, &iter); | |
55cc08a6 DG |
336 | assert(!ret); |
337 | delete_ust_app_ctx(sock, ua_ctx); | |
338 | } | |
bec39940 | 339 | lttng_ht_destroy(ua_chan->ctx); |
d80a6244 | 340 | |
55cc08a6 | 341 | /* Wipe events */ |
bec39940 DG |
342 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
343 | node.node) { | |
344 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 345 | assert(!ret); |
d80a6244 DG |
346 | delete_ust_app_event(sock, ua_event); |
347 | } | |
bec39940 | 348 | lttng_ht_destroy(ua_chan->events); |
edb67388 | 349 | |
45893984 | 350 | /* Wipe and free registry from session registry. */ |
7972aab2 DG |
351 | registry = get_session_registry(ua_chan->session); |
352 | if (registry) { | |
353 | ust_registry_channel_del_free(registry, ua_chan->key); | |
354 | } | |
d0b96690 | 355 | |
edb67388 | 356 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
357 | /* Remove channel from application UST object descriptor. */ |
358 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
359 | lttng_ht_del(app->ust_objd, &iter); | |
ffe60014 DG |
360 | ret = ustctl_release_object(sock, ua_chan->obj); |
361 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
362 | ERR("UST app sock %d release channel obj failed with ret %d", | |
363 | sock, ret); | |
364 | } | |
7972aab2 | 365 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
366 | free(ua_chan->obj); |
367 | } | |
84cd17c6 | 368 | free(ua_chan); |
d80a6244 DG |
369 | } |
370 | ||
331744e3 JD |
371 | /* |
372 | * Push metadata to consumer socket. The socket lock MUST be acquired. | |
373 | * | |
374 | * On success, return the len of metadata pushed or else a negative value. | |
375 | */ | |
376 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
377 | struct consumer_socket *socket, int send_zero_data) | |
378 | { | |
379 | int ret; | |
380 | char *metadata_str = NULL; | |
381 | size_t len, offset; | |
382 | ssize_t ret_val; | |
383 | ||
384 | assert(registry); | |
385 | assert(socket); | |
386 | /* Should never be 0 which is the initial state. */ | |
387 | assert(registry->metadata_key); | |
388 | ||
389 | pthread_mutex_lock(®istry->lock); | |
390 | ||
391 | offset = registry->metadata_len_sent; | |
392 | len = registry->metadata_len - registry->metadata_len_sent; | |
393 | if (len == 0) { | |
394 | DBG3("No metadata to push for metadata key %" PRIu64, | |
395 | registry->metadata_key); | |
396 | ret_val = len; | |
397 | if (send_zero_data) { | |
398 | DBG("No metadata to push"); | |
399 | goto push_data; | |
400 | } | |
401 | goto end; | |
402 | } | |
403 | ||
404 | /* Allocate only what we have to send. */ | |
405 | metadata_str = zmalloc(len); | |
406 | if (!metadata_str) { | |
407 | PERROR("zmalloc ust app metadata string"); | |
408 | ret_val = -ENOMEM; | |
409 | goto error; | |
410 | } | |
411 | /* Copy what we haven't send out. */ | |
412 | memcpy(metadata_str, registry->metadata + offset, len); | |
413 | registry->metadata_len_sent += len; | |
414 | ||
415 | push_data: | |
416 | pthread_mutex_unlock(®istry->lock); | |
417 | ret = consumer_push_metadata(socket, registry->metadata_key, | |
418 | metadata_str, len, offset); | |
419 | if (ret < 0) { | |
420 | ret_val = ret; | |
421 | goto error_push; | |
422 | } | |
423 | ||
424 | free(metadata_str); | |
425 | return len; | |
426 | ||
427 | end: | |
428 | error: | |
429 | pthread_mutex_unlock(®istry->lock); | |
430 | error_push: | |
431 | free(metadata_str); | |
432 | return ret_val; | |
433 | } | |
434 | ||
d88aee68 DG |
435 | /* |
436 | * For a given application and session, push metadata to consumer. The session | |
437 | * lock MUST be acquired here before calling this. | |
331744e3 JD |
438 | * Either sock or consumer is required : if sock is NULL, the default |
439 | * socket to send the metadata is retrieved from consumer, if sock | |
440 | * is not NULL we use it to send the metadata. | |
d88aee68 DG |
441 | * |
442 | * Return 0 on success else a negative error. | |
443 | */ | |
7972aab2 DG |
444 | static int push_metadata(struct ust_registry_session *registry, |
445 | struct consumer_output *consumer) | |
d88aee68 | 446 | { |
331744e3 JD |
447 | int ret_val; |
448 | ssize_t ret; | |
d88aee68 DG |
449 | struct consumer_socket *socket; |
450 | ||
7972aab2 DG |
451 | assert(registry); |
452 | assert(consumer); | |
453 | ||
454 | rcu_read_lock(); | |
d88aee68 | 455 | |
7972aab2 DG |
456 | /* |
457 | * Means that no metadata was assigned to the session. This can happens if | |
458 | * no start has been done previously. | |
459 | */ | |
460 | if (!registry->metadata_key) { | |
331744e3 | 461 | ret_val = 0; |
7972aab2 | 462 | goto error_rcu_unlock; |
d88aee68 DG |
463 | } |
464 | ||
d88aee68 | 465 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
466 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
467 | consumer); | |
d88aee68 | 468 | if (!socket) { |
331744e3 | 469 | ret_val = -1; |
d88aee68 DG |
470 | goto error_rcu_unlock; |
471 | } | |
472 | ||
473 | /* | |
474 | * TODO: Currently, we hold the socket lock around sampling of the next | |
475 | * metadata segment to ensure we send metadata over the consumer socket in | |
476 | * the correct order. This makes the registry lock nest inside the socket | |
477 | * lock. | |
478 | * | |
479 | * Please note that this is a temporary measure: we should move this lock | |
480 | * back into ust_consumer_push_metadata() when the consumer gets the | |
481 | * ability to reorder the metadata it receives. | |
482 | */ | |
483 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
484 | ret = ust_app_push_metadata(registry, socket, 0); |
485 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 486 | if (ret < 0) { |
331744e3 | 487 | ret_val = ret; |
d88aee68 DG |
488 | goto error_rcu_unlock; |
489 | } | |
490 | ||
d88aee68 | 491 | rcu_read_unlock(); |
d88aee68 DG |
492 | return 0; |
493 | ||
d88aee68 DG |
494 | error_rcu_unlock: |
495 | rcu_read_unlock(); | |
331744e3 | 496 | return ret_val; |
d88aee68 DG |
497 | } |
498 | ||
499 | /* | |
500 | * Send to the consumer a close metadata command for the given session. Once | |
501 | * done, the metadata channel is deleted and the session metadata pointer is | |
502 | * nullified. The session lock MUST be acquired here unless the application is | |
503 | * in the destroy path. | |
504 | * | |
505 | * Return 0 on success else a negative value. | |
506 | */ | |
7972aab2 DG |
507 | static int close_metadata(struct ust_registry_session *registry, |
508 | struct consumer_output *consumer) | |
d88aee68 DG |
509 | { |
510 | int ret; | |
511 | struct consumer_socket *socket; | |
512 | ||
7972aab2 DG |
513 | assert(registry); |
514 | assert(consumer); | |
d88aee68 | 515 | |
7972aab2 DG |
516 | rcu_read_lock(); |
517 | ||
518 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 DG |
519 | ret = 0; |
520 | goto error; | |
521 | } | |
522 | ||
d88aee68 | 523 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
524 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
525 | consumer); | |
d88aee68 DG |
526 | if (!socket) { |
527 | ret = -1; | |
7972aab2 | 528 | goto error; |
d88aee68 DG |
529 | } |
530 | ||
7972aab2 | 531 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 532 | if (ret < 0) { |
7972aab2 | 533 | goto error; |
d88aee68 DG |
534 | } |
535 | ||
7972aab2 DG |
536 | /* Metadata successfully closed. Flag the registry. */ |
537 | registry->metadata_closed = 1; | |
d88aee68 | 538 | |
d88aee68 | 539 | error: |
7972aab2 | 540 | rcu_read_unlock(); |
d88aee68 DG |
541 | return ret; |
542 | } | |
543 | ||
d80a6244 DG |
544 | /* |
545 | * Delete ust app session safely. RCU read lock must be held before calling | |
546 | * this function. | |
547 | */ | |
8b366481 | 548 | static |
d0b96690 DG |
549 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
550 | struct ust_app *app) | |
d80a6244 DG |
551 | { |
552 | int ret; | |
bec39940 | 553 | struct lttng_ht_iter iter; |
d80a6244 | 554 | struct ust_app_channel *ua_chan; |
7972aab2 | 555 | struct ust_registry_session *registry; |
d80a6244 | 556 | |
d88aee68 DG |
557 | assert(ua_sess); |
558 | ||
7972aab2 DG |
559 | registry = get_session_registry(ua_sess); |
560 | if (registry) { | |
d88aee68 | 561 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 562 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 563 | |
7972aab2 DG |
564 | /* |
565 | * Don't ask to close metadata for global per UID buffers. Close | |
566 | * metadata only on destroy trace session in this case. | |
567 | */ | |
568 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { | |
569 | /* And ask to close it for this session registry. */ | |
570 | (void) close_metadata(registry, ua_sess->consumer); | |
571 | } | |
d80a6244 DG |
572 | } |
573 | ||
bec39940 DG |
574 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
575 | node.node) { | |
576 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 577 | assert(!ret); |
d0b96690 | 578 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 579 | } |
bec39940 | 580 | lttng_ht_destroy(ua_sess->channels); |
d80a6244 | 581 | |
7972aab2 DG |
582 | /* In case of per PID, the registry is kept in the session. */ |
583 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
584 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
585 | if (reg_pid) { | |
586 | buffer_reg_pid_remove(reg_pid); | |
587 | buffer_reg_pid_destroy(reg_pid); | |
588 | } | |
589 | } | |
d0b96690 | 590 | |
aee6bafd | 591 | if (ua_sess->handle != -1) { |
ffe60014 DG |
592 | ret = ustctl_release_handle(sock, ua_sess->handle); |
593 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
594 | ERR("UST app sock %d release session handle failed with ret %d", | |
595 | sock, ret); | |
596 | } | |
aee6bafd | 597 | } |
8b366481 | 598 | free(ua_sess); |
d80a6244 | 599 | } |
91d76f53 DG |
600 | |
601 | /* | |
284d8f55 DG |
602 | * Delete a traceable application structure from the global list. Never call |
603 | * this function outside of a call_rcu call. | |
91d76f53 | 604 | */ |
8b366481 DG |
605 | static |
606 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 607 | { |
8b366481 | 608 | int ret, sock; |
d42f20df | 609 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 610 | |
f6a9efaa | 611 | rcu_read_lock(); |
44d3bd01 | 612 | |
d80a6244 | 613 | /* Delete ust app sessions info */ |
852d0037 DG |
614 | sock = app->sock; |
615 | app->sock = -1; | |
d80a6244 | 616 | |
d42f20df DG |
617 | lttng_ht_destroy(app->sessions); |
618 | ||
8b366481 | 619 | /* Wipe sessions */ |
d42f20df DG |
620 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
621 | teardown_node) { | |
622 | /* Free every object in the session and the session. */ | |
d0b96690 | 623 | delete_ust_app_session(sock, ua_sess, app); |
d80a6244 | 624 | } |
7972aab2 | 625 | lttng_ht_destroy(app->ust_objd); |
d80a6244 | 626 | |
6414a713 | 627 | /* |
852d0037 DG |
628 | * Wait until we have deleted the application from the sock hash table |
629 | * before closing this socket, otherwise an application could re-use the | |
630 | * socket ID and race with the teardown, using the same hash table entry. | |
631 | * | |
632 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
633 | * all RCU readers that could run concurrently with unregister app, | |
634 | * therefore we _need_ to only close that socket after a grace period. So | |
635 | * it should stay in this RCU callback. | |
636 | * | |
637 | * This close() is a very important step of the synchronization model so | |
638 | * every modification to this function must be carefully reviewed. | |
6414a713 | 639 | */ |
799e2c4f MD |
640 | ret = close(sock); |
641 | if (ret) { | |
642 | PERROR("close"); | |
643 | } | |
4063050c | 644 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 645 | |
852d0037 | 646 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 647 | free(app); |
bec39940 | 648 | |
f6a9efaa | 649 | rcu_read_unlock(); |
099e26bd DG |
650 | } |
651 | ||
652 | /* | |
f6a9efaa | 653 | * URCU intermediate call to delete an UST app. |
099e26bd | 654 | */ |
8b366481 DG |
655 | static |
656 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 657 | { |
bec39940 DG |
658 | struct lttng_ht_node_ulong *node = |
659 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 660 | struct ust_app *app = |
852d0037 | 661 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 662 | |
852d0037 | 663 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 664 | delete_ust_app(app); |
099e26bd DG |
665 | } |
666 | ||
ffe60014 DG |
667 | /* |
668 | * Delete the session from the application ht and delete the data structure by | |
669 | * freeing every object inside and releasing them. | |
670 | */ | |
d0b96690 | 671 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
672 | struct ust_app_session *ua_sess) |
673 | { | |
674 | int ret; | |
675 | struct lttng_ht_iter iter; | |
676 | ||
677 | assert(app); | |
678 | assert(ua_sess); | |
679 | ||
680 | iter.iter.node = &ua_sess->node.node; | |
681 | ret = lttng_ht_del(app->sessions, &iter); | |
682 | if (ret) { | |
683 | /* Already scheduled for teardown. */ | |
684 | goto end; | |
685 | } | |
686 | ||
687 | /* Once deleted, free the data structure. */ | |
d0b96690 | 688 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
689 | |
690 | end: | |
691 | return; | |
692 | } | |
693 | ||
8b366481 DG |
694 | /* |
695 | * Alloc new UST app session. | |
696 | */ | |
697 | static | |
d0b96690 | 698 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
699 | { |
700 | struct ust_app_session *ua_sess; | |
701 | ||
702 | /* Init most of the default value by allocating and zeroing */ | |
703 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
704 | if (ua_sess == NULL) { | |
705 | PERROR("malloc"); | |
ffe60014 | 706 | goto error_free; |
8b366481 DG |
707 | } |
708 | ||
709 | ua_sess->handle = -1; | |
bec39940 | 710 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
d0b96690 | 711 | pthread_mutex_init(&ua_sess->lock, NULL); |
ffe60014 | 712 | |
8b366481 DG |
713 | return ua_sess; |
714 | ||
ffe60014 | 715 | error_free: |
8b366481 DG |
716 | return NULL; |
717 | } | |
718 | ||
719 | /* | |
720 | * Alloc new UST app channel. | |
721 | */ | |
722 | static | |
723 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 724 | struct ust_app_session *ua_sess, |
ffe60014 | 725 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
726 | { |
727 | struct ust_app_channel *ua_chan; | |
728 | ||
729 | /* Init most of the default value by allocating and zeroing */ | |
730 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
731 | if (ua_chan == NULL) { | |
732 | PERROR("malloc"); | |
733 | goto error; | |
734 | } | |
735 | ||
736 | /* Setup channel name */ | |
737 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
738 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
739 | ||
740 | ua_chan->enabled = 1; | |
741 | ua_chan->handle = -1; | |
45893984 | 742 | ua_chan->session = ua_sess; |
ffe60014 | 743 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
744 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
745 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
746 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
747 | |
748 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
749 | ||
750 | /* Copy attributes */ | |
751 | if (attr) { | |
ffe60014 | 752 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
753 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
754 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
755 | ua_chan->attr.overwrite = attr->overwrite; | |
756 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
757 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
758 | ua_chan->attr.output = attr->output; | |
8b366481 | 759 | } |
ffe60014 DG |
760 | /* By default, the channel is a per cpu channel. */ |
761 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
762 | |
763 | DBG3("UST app channel %s allocated", ua_chan->name); | |
764 | ||
765 | return ua_chan; | |
766 | ||
767 | error: | |
768 | return NULL; | |
769 | } | |
770 | ||
37f1c236 DG |
771 | /* |
772 | * Allocate and initialize a UST app stream. | |
773 | * | |
774 | * Return newly allocated stream pointer or NULL on error. | |
775 | */ | |
ffe60014 | 776 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
777 | { |
778 | struct ust_app_stream *stream = NULL; | |
779 | ||
780 | stream = zmalloc(sizeof(*stream)); | |
781 | if (stream == NULL) { | |
782 | PERROR("zmalloc ust app stream"); | |
783 | goto error; | |
784 | } | |
785 | ||
786 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
787 | stream->handle = -1; | |
788 | ||
789 | error: | |
790 | return stream; | |
791 | } | |
792 | ||
8b366481 DG |
793 | /* |
794 | * Alloc new UST app event. | |
795 | */ | |
796 | static | |
797 | struct ust_app_event *alloc_ust_app_event(char *name, | |
798 | struct lttng_ust_event *attr) | |
799 | { | |
800 | struct ust_app_event *ua_event; | |
801 | ||
802 | /* Init most of the default value by allocating and zeroing */ | |
803 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
804 | if (ua_event == NULL) { | |
805 | PERROR("malloc"); | |
806 | goto error; | |
807 | } | |
808 | ||
809 | ua_event->enabled = 1; | |
810 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
811 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 812 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
813 | |
814 | /* Copy attributes */ | |
815 | if (attr) { | |
816 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
817 | } | |
818 | ||
819 | DBG3("UST app event %s allocated", ua_event->name); | |
820 | ||
821 | return ua_event; | |
822 | ||
823 | error: | |
824 | return NULL; | |
825 | } | |
826 | ||
827 | /* | |
828 | * Alloc new UST app context. | |
829 | */ | |
830 | static | |
831 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
832 | { | |
833 | struct ust_app_ctx *ua_ctx; | |
834 | ||
835 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
836 | if (ua_ctx == NULL) { | |
837 | goto error; | |
838 | } | |
839 | ||
840 | if (uctx) { | |
841 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
842 | } | |
843 | ||
844 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
845 | ||
846 | error: | |
847 | return ua_ctx; | |
848 | } | |
849 | ||
025faf73 DG |
850 | /* |
851 | * Allocate a filter and copy the given original filter. | |
852 | * | |
853 | * Return allocated filter or NULL on error. | |
854 | */ | |
855 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
856 | struct lttng_ust_filter_bytecode *orig_f) | |
857 | { | |
858 | struct lttng_ust_filter_bytecode *filter = NULL; | |
859 | ||
860 | /* Copy filter bytecode */ | |
861 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
862 | if (!filter) { | |
863 | PERROR("zmalloc alloc ust app filter"); | |
864 | goto error; | |
865 | } | |
866 | ||
867 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
868 | ||
869 | error: | |
870 | return filter; | |
871 | } | |
872 | ||
099e26bd | 873 | /* |
421cb601 DG |
874 | * Find an ust_app using the sock and return it. RCU read side lock must be |
875 | * held before calling this helper function. | |
099e26bd | 876 | */ |
8b366481 DG |
877 | static |
878 | struct ust_app *find_app_by_sock(int sock) | |
099e26bd | 879 | { |
bec39940 | 880 | struct lttng_ht_node_ulong *node; |
bec39940 | 881 | struct lttng_ht_iter iter; |
f6a9efaa | 882 | |
852d0037 | 883 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 884 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
885 | if (node == NULL) { |
886 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
887 | goto error; |
888 | } | |
852d0037 DG |
889 | |
890 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
891 | |
892 | error: | |
893 | return NULL; | |
099e26bd DG |
894 | } |
895 | ||
d0b96690 DG |
896 | /* |
897 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
898 | * be held before calling this helper function. | |
899 | */ | |
900 | static struct ust_app *find_app_by_notify_sock(int sock) | |
901 | { | |
902 | struct lttng_ht_node_ulong *node; | |
903 | struct lttng_ht_iter iter; | |
904 | ||
905 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
906 | &iter); | |
907 | node = lttng_ht_iter_get_node_ulong(&iter); | |
908 | if (node == NULL) { | |
909 | DBG2("UST app find by notify sock %d not found", sock); | |
910 | goto error; | |
911 | } | |
912 | ||
913 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
914 | ||
915 | error: | |
916 | return NULL; | |
917 | } | |
918 | ||
025faf73 DG |
919 | /* |
920 | * Lookup for an ust app event based on event name, filter bytecode and the | |
921 | * event loglevel. | |
922 | * | |
923 | * Return an ust_app_event object or NULL on error. | |
924 | */ | |
18eace3b DG |
925 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
926 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel) | |
927 | { | |
928 | struct lttng_ht_iter iter; | |
929 | struct lttng_ht_node_str *node; | |
930 | struct ust_app_event *event = NULL; | |
931 | struct ust_app_ht_key key; | |
18eace3b DG |
932 | |
933 | assert(name); | |
934 | assert(ht); | |
935 | ||
936 | /* Setup key for event lookup. */ | |
937 | key.name = name; | |
938 | key.filter = filter; | |
939 | key.loglevel = loglevel; | |
940 | ||
025faf73 DG |
941 | /* Lookup using the event name as hash and a custom match fct. */ |
942 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
943 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
944 | node = lttng_ht_iter_get_node_str(&iter); |
945 | if (node == NULL) { | |
946 | goto end; | |
947 | } | |
948 | ||
949 | event = caa_container_of(node, struct ust_app_event, node); | |
950 | ||
951 | end: | |
18eace3b DG |
952 | return event; |
953 | } | |
954 | ||
55cc08a6 DG |
955 | /* |
956 | * Create the channel context on the tracer. | |
d0b96690 DG |
957 | * |
958 | * Called with UST app session lock held. | |
55cc08a6 DG |
959 | */ |
960 | static | |
961 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
962 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
963 | { | |
964 | int ret; | |
965 | ||
840cb59c | 966 | health_code_update(); |
86acf0da | 967 | |
852d0037 | 968 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
969 | ua_chan->obj, &ua_ctx->obj); |
970 | if (ret < 0) { | |
ffe60014 DG |
971 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
972 | ERR("UST app create channel context failed for app (pid: %d) " | |
973 | "with ret %d", app->pid, ret); | |
974 | } else { | |
975 | DBG3("UST app disable event failed. Application is dead."); | |
976 | } | |
55cc08a6 DG |
977 | goto error; |
978 | } | |
979 | ||
980 | ua_ctx->handle = ua_ctx->obj->handle; | |
981 | ||
d0b96690 DG |
982 | DBG2("UST app context handle %d created successfully for channel %s", |
983 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
984 | |
985 | error: | |
840cb59c | 986 | health_code_update(); |
55cc08a6 DG |
987 | return ret; |
988 | } | |
989 | ||
53a80697 MD |
990 | /* |
991 | * Set the filter on the tracer. | |
992 | */ | |
993 | static | |
994 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
995 | struct ust_app *app) | |
996 | { | |
997 | int ret; | |
998 | ||
840cb59c | 999 | health_code_update(); |
86acf0da | 1000 | |
53a80697 | 1001 | if (!ua_event->filter) { |
86acf0da DG |
1002 | ret = 0; |
1003 | goto error; | |
53a80697 MD |
1004 | } |
1005 | ||
1006 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1007 | ua_event->obj); | |
1008 | if (ret < 0) { | |
ffe60014 DG |
1009 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1010 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1011 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1012 | } else { | |
1013 | DBG3("UST app filter event failed. Application is dead."); | |
1014 | } | |
53a80697 MD |
1015 | goto error; |
1016 | } | |
1017 | ||
1018 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1019 | ||
1020 | error: | |
840cb59c | 1021 | health_code_update(); |
53a80697 MD |
1022 | return ret; |
1023 | } | |
1024 | ||
9730260e DG |
1025 | /* |
1026 | * Disable the specified event on to UST tracer for the UST session. | |
1027 | */ | |
1028 | static int disable_ust_event(struct ust_app *app, | |
1029 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1030 | { | |
1031 | int ret; | |
1032 | ||
840cb59c | 1033 | health_code_update(); |
86acf0da | 1034 | |
852d0037 | 1035 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1036 | if (ret < 0) { |
ffe60014 DG |
1037 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1038 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1039 | "and session handle %d with ret %d", | |
1040 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1041 | } else { | |
1042 | DBG3("UST app disable event failed. Application is dead."); | |
1043 | } | |
9730260e DG |
1044 | goto error; |
1045 | } | |
1046 | ||
1047 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1048 | ua_event->attr.name, app->pid); |
9730260e DG |
1049 | |
1050 | error: | |
840cb59c | 1051 | health_code_update(); |
9730260e DG |
1052 | return ret; |
1053 | } | |
1054 | ||
78f0bacd DG |
1055 | /* |
1056 | * Disable the specified channel on to UST tracer for the UST session. | |
1057 | */ | |
1058 | static int disable_ust_channel(struct ust_app *app, | |
1059 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1060 | { | |
1061 | int ret; | |
1062 | ||
840cb59c | 1063 | health_code_update(); |
86acf0da | 1064 | |
852d0037 | 1065 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1066 | if (ret < 0) { |
ffe60014 DG |
1067 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1068 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1069 | "and session handle %d with ret %d", | |
1070 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1071 | } else { | |
1072 | DBG3("UST app disable channel failed. Application is dead."); | |
1073 | } | |
78f0bacd DG |
1074 | goto error; |
1075 | } | |
1076 | ||
78f0bacd | 1077 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1078 | ua_chan->name, app->pid); |
78f0bacd DG |
1079 | |
1080 | error: | |
840cb59c | 1081 | health_code_update(); |
78f0bacd DG |
1082 | return ret; |
1083 | } | |
1084 | ||
1085 | /* | |
1086 | * Enable the specified channel on to UST tracer for the UST session. | |
1087 | */ | |
1088 | static int enable_ust_channel(struct ust_app *app, | |
1089 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1090 | { | |
1091 | int ret; | |
1092 | ||
840cb59c | 1093 | health_code_update(); |
86acf0da | 1094 | |
852d0037 | 1095 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1096 | if (ret < 0) { |
ffe60014 DG |
1097 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1098 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1099 | "and session handle %d with ret %d", | |
1100 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1101 | } else { | |
1102 | DBG3("UST app enable channel failed. Application is dead."); | |
1103 | } | |
78f0bacd DG |
1104 | goto error; |
1105 | } | |
1106 | ||
1107 | ua_chan->enabled = 1; | |
1108 | ||
1109 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1110 | ua_chan->name, app->pid); |
78f0bacd DG |
1111 | |
1112 | error: | |
840cb59c | 1113 | health_code_update(); |
78f0bacd DG |
1114 | return ret; |
1115 | } | |
1116 | ||
edb67388 DG |
1117 | /* |
1118 | * Enable the specified event on to UST tracer for the UST session. | |
1119 | */ | |
1120 | static int enable_ust_event(struct ust_app *app, | |
1121 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1122 | { | |
1123 | int ret; | |
1124 | ||
840cb59c | 1125 | health_code_update(); |
86acf0da | 1126 | |
852d0037 | 1127 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1128 | if (ret < 0) { |
ffe60014 DG |
1129 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1130 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1131 | "and session handle %d with ret %d", | |
1132 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1133 | } else { | |
1134 | DBG3("UST app enable event failed. Application is dead."); | |
1135 | } | |
edb67388 DG |
1136 | goto error; |
1137 | } | |
1138 | ||
1139 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1140 | ua_event->attr.name, app->pid); |
edb67388 DG |
1141 | |
1142 | error: | |
840cb59c | 1143 | health_code_update(); |
edb67388 DG |
1144 | return ret; |
1145 | } | |
1146 | ||
099e26bd | 1147 | /* |
7972aab2 | 1148 | * Send channel and stream buffer to application. |
4f3ab6ee | 1149 | * |
ffe60014 | 1150 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1151 | */ |
7972aab2 DG |
1152 | static int send_channel_pid_to_ust(struct ust_app *app, |
1153 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1154 | { |
1155 | int ret; | |
ffe60014 | 1156 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1157 | |
1158 | assert(app); | |
ffe60014 | 1159 | assert(ua_sess); |
4f3ab6ee | 1160 | assert(ua_chan); |
4f3ab6ee | 1161 | |
840cb59c | 1162 | health_code_update(); |
4f3ab6ee | 1163 | |
7972aab2 DG |
1164 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1165 | app->sock); | |
86acf0da | 1166 | |
ffe60014 DG |
1167 | /* Send channel to the application. */ |
1168 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1169 | if (ret < 0) { |
b551a063 DG |
1170 | goto error; |
1171 | } | |
1172 | ||
d88aee68 DG |
1173 | health_code_update(); |
1174 | ||
ffe60014 DG |
1175 | /* Send all streams to application. */ |
1176 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1177 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1178 | if (ret < 0) { | |
1179 | goto error; | |
1180 | } | |
1181 | /* We don't need the stream anymore once sent to the tracer. */ | |
1182 | cds_list_del(&stream->list); | |
1183 | delete_ust_app_stream(-1, stream); | |
1184 | } | |
ffe60014 DG |
1185 | /* Flag the channel that it is sent to the application. */ |
1186 | ua_chan->is_sent = 1; | |
ffe60014 | 1187 | |
b551a063 | 1188 | error: |
840cb59c | 1189 | health_code_update(); |
b551a063 DG |
1190 | return ret; |
1191 | } | |
1192 | ||
91d76f53 | 1193 | /* |
5b4a0ec0 | 1194 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1195 | * |
1196 | * Should be called with session mutex held. | |
91d76f53 | 1197 | */ |
edb67388 DG |
1198 | static |
1199 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1200 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1201 | { |
5b4a0ec0 | 1202 | int ret = 0; |
284d8f55 | 1203 | |
840cb59c | 1204 | health_code_update(); |
86acf0da | 1205 | |
5b4a0ec0 | 1206 | /* Create UST event on tracer */ |
852d0037 | 1207 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1208 | &ua_event->obj); |
1209 | if (ret < 0) { | |
ffe60014 DG |
1210 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1211 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1212 | ua_event->attr.name, app->pid, ret); | |
1213 | } else { | |
1214 | DBG3("UST app create event failed. Application is dead."); | |
1215 | } | |
5b4a0ec0 | 1216 | goto error; |
91d76f53 | 1217 | } |
f6a9efaa | 1218 | |
5b4a0ec0 | 1219 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1220 | |
5b4a0ec0 | 1221 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1222 | ua_event->attr.name, app->pid); |
f6a9efaa | 1223 | |
840cb59c | 1224 | health_code_update(); |
86acf0da | 1225 | |
025faf73 DG |
1226 | /* Set filter if one is present. */ |
1227 | if (ua_event->filter) { | |
1228 | ret = set_ust_event_filter(ua_event, app); | |
1229 | if (ret < 0) { | |
1230 | goto error; | |
1231 | } | |
1232 | } | |
1233 | ||
8535a6d9 | 1234 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 1235 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
1236 | ret = disable_ust_event(app, ua_sess, ua_event); |
1237 | if (ret < 0) { | |
fc34caaa DG |
1238 | /* |
1239 | * If we hit an EPERM, something is wrong with our disable call. If | |
1240 | * we get an EEXIST, there is a problem on the tracer side since we | |
1241 | * just created it. | |
1242 | */ | |
1243 | switch (ret) { | |
49c336c1 | 1244 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1245 | /* Code flow problem */ |
1246 | assert(0); | |
49c336c1 | 1247 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1248 | /* It's OK for our use case. */ |
1249 | ret = 0; | |
1250 | break; | |
1251 | default: | |
1252 | break; | |
1253 | } | |
8535a6d9 DG |
1254 | goto error; |
1255 | } | |
1256 | } | |
1257 | ||
5b4a0ec0 | 1258 | error: |
840cb59c | 1259 | health_code_update(); |
5b4a0ec0 | 1260 | return ret; |
91d76f53 | 1261 | } |
48842b30 | 1262 | |
5b4a0ec0 DG |
1263 | /* |
1264 | * Copy data between an UST app event and a LTT event. | |
1265 | */ | |
421cb601 | 1266 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1267 | struct ltt_ust_event *uevent) |
1268 | { | |
1269 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); | |
1270 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1271 | ||
fc34caaa DG |
1272 | ua_event->enabled = uevent->enabled; |
1273 | ||
5b4a0ec0 DG |
1274 | /* Copy event attributes */ |
1275 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1276 | ||
53a80697 MD |
1277 | /* Copy filter bytecode */ |
1278 | if (uevent->filter) { | |
025faf73 DG |
1279 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1280 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1281 | } |
48842b30 DG |
1282 | } |
1283 | ||
5b4a0ec0 DG |
1284 | /* |
1285 | * Copy data between an UST app channel and a LTT channel. | |
1286 | */ | |
421cb601 | 1287 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1288 | struct ltt_ust_channel *uchan) |
1289 | { | |
bec39940 | 1290 | struct lttng_ht_iter iter; |
48842b30 | 1291 | struct ltt_ust_event *uevent; |
55cc08a6 | 1292 | struct ltt_ust_context *uctx; |
48842b30 | 1293 | struct ust_app_event *ua_event; |
55cc08a6 | 1294 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1295 | |
fc34caaa | 1296 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1297 | |
1298 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1299 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 DG |
1300 | |
1301 | /* Copy event attributes since the layout is different. */ | |
1302 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1303 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1304 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1305 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1306 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1307 | ua_chan->attr.output = uchan->attr.output; | |
1308 | /* | |
1309 | * Note that the attribute channel type is not set since the channel on the | |
1310 | * tracing registry side does not have this information. | |
1311 | */ | |
48842b30 | 1312 | |
fc34caaa | 1313 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1314 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1315 | |
bec39940 | 1316 | cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) { |
55cc08a6 DG |
1317 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1318 | if (ua_ctx == NULL) { | |
1319 | continue; | |
1320 | } | |
bec39940 DG |
1321 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1322 | (unsigned long) ua_ctx->ctx.ctx); | |
1323 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
55cc08a6 | 1324 | } |
48842b30 | 1325 | |
421cb601 | 1326 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1327 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b DG |
1328 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
1329 | uevent->filter, uevent->attr.loglevel); | |
1330 | if (ua_event == NULL) { | |
421cb601 | 1331 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1332 | uevent->attr.name); |
284d8f55 | 1333 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1334 | if (ua_event == NULL) { |
5b4a0ec0 | 1335 | continue; |
48842b30 | 1336 | } |
421cb601 | 1337 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1338 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1339 | } |
48842b30 DG |
1340 | } |
1341 | ||
fc34caaa | 1342 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1343 | } |
1344 | ||
5b4a0ec0 DG |
1345 | /* |
1346 | * Copy data between a UST app session and a regular LTT session. | |
1347 | */ | |
421cb601 | 1348 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1349 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1350 | { |
bec39940 DG |
1351 | struct lttng_ht_node_str *ua_chan_node; |
1352 | struct lttng_ht_iter iter; | |
48842b30 DG |
1353 | struct ltt_ust_channel *uchan; |
1354 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1355 | time_t rawtime; |
1356 | struct tm *timeinfo; | |
1357 | char datetime[16]; | |
1358 | int ret; | |
1359 | ||
1360 | /* Get date and time for unique app path */ | |
1361 | time(&rawtime); | |
1362 | timeinfo = localtime(&rawtime); | |
1363 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1364 | |
421cb601 | 1365 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1366 | |
7972aab2 DG |
1367 | ua_sess->tracing_id = usess->id; |
1368 | ua_sess->id = get_next_session_id(); | |
1369 | ua_sess->uid = app->uid; | |
1370 | ua_sess->gid = app->gid; | |
1371 | ua_sess->euid = usess->uid; | |
1372 | ua_sess->egid = usess->gid; | |
1373 | ua_sess->buffer_type = usess->buffer_type; | |
1374 | ua_sess->bits_per_long = app->bits_per_long; | |
1375 | /* There is only one consumer object per session possible. */ | |
1376 | ua_sess->consumer = usess->consumer; | |
1377 | ||
1378 | switch (ua_sess->buffer_type) { | |
1379 | case LTTNG_BUFFER_PER_PID: | |
1380 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1381 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s/", app->name, app->pid, | |
1382 | datetime); | |
1383 | break; | |
1384 | case LTTNG_BUFFER_PER_UID: | |
1385 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1386 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1387 | break; | |
1388 | default: | |
1389 | assert(0); | |
1390 | goto error; | |
1391 | } | |
477d7741 MD |
1392 | if (ret < 0) { |
1393 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1394 | assert(0); |
7972aab2 | 1395 | goto error; |
477d7741 MD |
1396 | } |
1397 | ||
48842b30 | 1398 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1399 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1400 | uchan, node.node) { | |
1401 | struct lttng_ht_iter uiter; | |
ba767faf | 1402 | |
bec39940 DG |
1403 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1404 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1405 | if (ua_chan_node != NULL) { |
fc34caaa | 1406 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1407 | continue; |
1408 | } | |
421cb601 | 1409 | |
5b4a0ec0 DG |
1410 | DBG2("Channel %s not found on shadow session copy, creating it", |
1411 | uchan->name); | |
d0b96690 | 1412 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1413 | if (ua_chan == NULL) { |
fc34caaa | 1414 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1415 | continue; |
48842b30 | 1416 | } |
5b4a0ec0 | 1417 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1418 | /* |
1419 | * The concept of metadata channel does not exist on the tracing | |
1420 | * registry side of the session daemon so this can only be a per CPU | |
1421 | * channel and not metadata. | |
1422 | */ | |
1423 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1424 | ||
bec39940 | 1425 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1426 | } |
7972aab2 DG |
1427 | |
1428 | error: | |
1429 | return; | |
48842b30 DG |
1430 | } |
1431 | ||
78f0bacd DG |
1432 | /* |
1433 | * Lookup sesison wrapper. | |
1434 | */ | |
84cd17c6 MD |
1435 | static |
1436 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1437 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1438 | { |
1439 | /* Get right UST app session from app */ | |
2c348c10 | 1440 | lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter); |
84cd17c6 MD |
1441 | } |
1442 | ||
421cb601 DG |
1443 | /* |
1444 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1445 | * id. |
421cb601 | 1446 | */ |
48842b30 DG |
1447 | static struct ust_app_session *lookup_session_by_app( |
1448 | struct ltt_ust_session *usess, struct ust_app *app) | |
1449 | { | |
bec39940 DG |
1450 | struct lttng_ht_iter iter; |
1451 | struct lttng_ht_node_ulong *node; | |
48842b30 | 1452 | |
84cd17c6 | 1453 | __lookup_session_by_app(usess, app, &iter); |
bec39940 | 1454 | node = lttng_ht_iter_get_node_ulong(&iter); |
48842b30 DG |
1455 | if (node == NULL) { |
1456 | goto error; | |
1457 | } | |
1458 | ||
1459 | return caa_container_of(node, struct ust_app_session, node); | |
1460 | ||
1461 | error: | |
1462 | return NULL; | |
1463 | } | |
1464 | ||
7972aab2 DG |
1465 | /* |
1466 | * Setup buffer registry per PID for the given session and application. If none | |
1467 | * is found, a new one is created, added to the global registry and | |
1468 | * initialized. If regp is valid, it's set with the newly created object. | |
1469 | * | |
1470 | * Return 0 on success or else a negative value. | |
1471 | */ | |
1472 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1473 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1474 | { | |
1475 | int ret = 0; | |
1476 | struct buffer_reg_pid *reg_pid; | |
1477 | ||
1478 | assert(ua_sess); | |
1479 | assert(app); | |
1480 | ||
1481 | rcu_read_lock(); | |
1482 | ||
1483 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1484 | if (!reg_pid) { | |
1485 | /* | |
1486 | * This is the create channel path meaning that if there is NO | |
1487 | * registry available, we have to create one for this session. | |
1488 | */ | |
1489 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1490 | if (ret < 0) { | |
1491 | goto error; | |
1492 | } | |
1493 | buffer_reg_pid_add(reg_pid); | |
1494 | } else { | |
1495 | goto end; | |
1496 | } | |
1497 | ||
1498 | /* Initialize registry. */ | |
1499 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1500 | app->bits_per_long, app->uint8_t_alignment, | |
1501 | app->uint16_t_alignment, app->uint32_t_alignment, | |
1502 | app->uint64_t_alignment, app->long_alignment, app->byte_order); | |
1503 | if (ret < 0) { | |
1504 | goto error; | |
1505 | } | |
1506 | ||
1507 | DBG3("UST app buffer registry per PID created successfully"); | |
1508 | ||
1509 | end: | |
1510 | if (regp) { | |
1511 | *regp = reg_pid; | |
1512 | } | |
1513 | error: | |
1514 | rcu_read_unlock(); | |
1515 | return ret; | |
1516 | } | |
1517 | ||
1518 | /* | |
1519 | * Setup buffer registry per UID for the given session and application. If none | |
1520 | * is found, a new one is created, added to the global registry and | |
1521 | * initialized. If regp is valid, it's set with the newly created object. | |
1522 | * | |
1523 | * Return 0 on success or else a negative value. | |
1524 | */ | |
1525 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1526 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1527 | { | |
1528 | int ret = 0; | |
1529 | struct buffer_reg_uid *reg_uid; | |
1530 | ||
1531 | assert(usess); | |
1532 | assert(app); | |
1533 | ||
1534 | rcu_read_lock(); | |
1535 | ||
1536 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1537 | if (!reg_uid) { | |
1538 | /* | |
1539 | * This is the create channel path meaning that if there is NO | |
1540 | * registry available, we have to create one for this session. | |
1541 | */ | |
1542 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1543 | LTTNG_DOMAIN_UST, ®_uid); | |
1544 | if (ret < 0) { | |
1545 | goto error; | |
1546 | } | |
1547 | buffer_reg_uid_add(reg_uid); | |
1548 | } else { | |
1549 | goto end; | |
1550 | } | |
1551 | ||
1552 | /* Initialize registry. */ | |
1553 | ret = ust_registry_session_init(®_uid->registry->reg.ust, app, | |
1554 | app->bits_per_long, app->uint8_t_alignment, | |
1555 | app->uint16_t_alignment, app->uint32_t_alignment, | |
1556 | app->uint64_t_alignment, app->long_alignment, app->byte_order); | |
1557 | if (ret < 0) { | |
1558 | goto error; | |
1559 | } | |
1560 | /* Add node to teardown list of the session. */ | |
1561 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1562 | ||
1563 | DBG3("UST app buffer registry per UID created successfully"); | |
1564 | ||
1565 | end: | |
1566 | if (regp) { | |
1567 | *regp = reg_uid; | |
1568 | } | |
1569 | error: | |
1570 | rcu_read_unlock(); | |
1571 | return ret; | |
1572 | } | |
1573 | ||
421cb601 | 1574 | /* |
3d8ca23b | 1575 | * Create a session on the tracer side for the given app. |
421cb601 | 1576 | * |
3d8ca23b DG |
1577 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1578 | * untouched. If the session was created, is_created is set to 1. On error, | |
1579 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1580 | * be NULL. | |
1581 | * | |
1582 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1583 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1584 | */ |
3d8ca23b DG |
1585 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1586 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1587 | int *is_created) | |
421cb601 | 1588 | { |
3d8ca23b | 1589 | int ret, created = 0; |
421cb601 DG |
1590 | struct ust_app_session *ua_sess; |
1591 | ||
3d8ca23b DG |
1592 | assert(usess); |
1593 | assert(app); | |
1594 | assert(ua_sess_ptr); | |
1595 | ||
840cb59c | 1596 | health_code_update(); |
86acf0da | 1597 | |
421cb601 DG |
1598 | ua_sess = lookup_session_by_app(usess, app); |
1599 | if (ua_sess == NULL) { | |
a991f516 | 1600 | DBG2("UST app pid: %d session id %d not found, creating it", |
852d0037 | 1601 | app->pid, usess->id); |
d0b96690 | 1602 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1603 | if (ua_sess == NULL) { |
1604 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1605 | ret = -ENOMEM; |
1606 | goto error; | |
421cb601 | 1607 | } |
477d7741 | 1608 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1609 | created = 1; |
421cb601 DG |
1610 | } |
1611 | ||
7972aab2 DG |
1612 | switch (usess->buffer_type) { |
1613 | case LTTNG_BUFFER_PER_PID: | |
1614 | /* Init local registry. */ | |
1615 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1616 | if (ret < 0) { |
7972aab2 DG |
1617 | goto error; |
1618 | } | |
1619 | break; | |
1620 | case LTTNG_BUFFER_PER_UID: | |
1621 | /* Look for a global registry. If none exists, create one. */ | |
1622 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1623 | if (ret < 0) { | |
1624 | goto error; | |
1625 | } | |
1626 | break; | |
1627 | default: | |
1628 | assert(0); | |
1629 | ret = -EINVAL; | |
1630 | goto error; | |
1631 | } | |
1632 | ||
1633 | health_code_update(); | |
1634 | ||
1635 | if (ua_sess->handle == -1) { | |
1636 | ret = ustctl_create_session(app->sock); | |
1637 | if (ret < 0) { | |
1638 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1639 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1640 | app->pid, ret); |
1641 | } else { | |
1642 | DBG("UST app creating session failed. Application is dead"); | |
1643 | } | |
d0b96690 | 1644 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1645 | if (ret != -ENOMEM) { |
1646 | /* | |
1647 | * Tracer is probably gone or got an internal error so let's | |
1648 | * behave like it will soon unregister or not usable. | |
1649 | */ | |
1650 | ret = -ENOTCONN; | |
1651 | } | |
1652 | goto error; | |
421cb601 DG |
1653 | } |
1654 | ||
7972aab2 DG |
1655 | ua_sess->handle = ret; |
1656 | ||
1657 | /* Add ust app session to app's HT */ | |
1658 | lttng_ht_node_init_ulong(&ua_sess->node, | |
1659 | (unsigned long) ua_sess->tracing_id); | |
1660 | lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node); | |
1661 | ||
1662 | DBG2("UST app session created successfully with handle %d", ret); | |
1663 | } | |
1664 | ||
1665 | *ua_sess_ptr = ua_sess; | |
1666 | if (is_created) { | |
1667 | *is_created = created; | |
1668 | } | |
1669 | ||
1670 | /* Everything went well. */ | |
1671 | ret = 0; | |
1672 | ||
1673 | error: | |
1674 | health_code_update(); | |
1675 | return ret; | |
1676 | } | |
1677 | ||
1678 | /* | |
1679 | * Create a context for the channel on the tracer. | |
1680 | * | |
1681 | * Called with UST app session lock held and a RCU read side lock. | |
1682 | */ | |
1683 | static | |
1684 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1685 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1686 | struct ust_app *app) | |
1687 | { | |
1688 | int ret = 0; | |
1689 | struct lttng_ht_iter iter; | |
1690 | struct lttng_ht_node_ulong *node; | |
1691 | struct ust_app_ctx *ua_ctx; | |
1692 | ||
1693 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1694 | ||
1695 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); | |
1696 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1697 | if (node != NULL) { | |
1698 | ret = -EEXIST; | |
1699 | goto error; | |
1700 | } | |
1701 | ||
1702 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1703 | if (ua_ctx == NULL) { | |
1704 | /* malloc failed */ | |
1705 | ret = -1; | |
1706 | goto error; | |
1707 | } | |
1708 | ||
1709 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
1710 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
1711 | ||
1712 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1713 | if (ret < 0) { | |
1714 | goto error; | |
1715 | } | |
1716 | ||
1717 | error: | |
1718 | return ret; | |
1719 | } | |
1720 | ||
1721 | /* | |
1722 | * Enable on the tracer side a ust app event for the session and channel. | |
1723 | * | |
1724 | * Called with UST app session lock held. | |
1725 | */ | |
1726 | static | |
1727 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
1728 | struct ust_app_event *ua_event, struct ust_app *app) | |
1729 | { | |
1730 | int ret; | |
1731 | ||
1732 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1733 | if (ret < 0) { | |
1734 | goto error; | |
1735 | } | |
1736 | ||
1737 | ua_event->enabled = 1; | |
1738 | ||
1739 | error: | |
1740 | return ret; | |
1741 | } | |
1742 | ||
1743 | /* | |
1744 | * Disable on the tracer side a ust app event for the session and channel. | |
1745 | */ | |
1746 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
1747 | struct ust_app_event *ua_event, struct ust_app *app) | |
1748 | { | |
1749 | int ret; | |
1750 | ||
1751 | ret = disable_ust_event(app, ua_sess, ua_event); | |
1752 | if (ret < 0) { | |
1753 | goto error; | |
1754 | } | |
1755 | ||
1756 | ua_event->enabled = 0; | |
1757 | ||
1758 | error: | |
1759 | return ret; | |
1760 | } | |
1761 | ||
1762 | /* | |
1763 | * Lookup ust app channel for session and disable it on the tracer side. | |
1764 | */ | |
1765 | static | |
1766 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
1767 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
1768 | { | |
1769 | int ret; | |
1770 | ||
1771 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
1772 | if (ret < 0) { | |
1773 | goto error; | |
1774 | } | |
1775 | ||
1776 | ua_chan->enabled = 0; | |
1777 | ||
1778 | error: | |
1779 | return ret; | |
1780 | } | |
1781 | ||
1782 | /* | |
1783 | * Lookup ust app channel for session and enable it on the tracer side. This | |
1784 | * MUST be called with a RCU read side lock acquired. | |
1785 | */ | |
1786 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
1787 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
1788 | { | |
1789 | int ret = 0; | |
1790 | struct lttng_ht_iter iter; | |
1791 | struct lttng_ht_node_str *ua_chan_node; | |
1792 | struct ust_app_channel *ua_chan; | |
1793 | ||
1794 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
1795 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
1796 | if (ua_chan_node == NULL) { | |
1797 | DBG2("Unable to find channel %s in ust session id %u", | |
1798 | uchan->name, ua_sess->tracing_id); | |
1799 | goto error; | |
1800 | } | |
1801 | ||
1802 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
1803 | ||
1804 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
1805 | if (ret < 0) { | |
1806 | goto error; | |
1807 | } | |
1808 | ||
1809 | error: | |
1810 | return ret; | |
1811 | } | |
1812 | ||
1813 | /* | |
1814 | * Ask the consumer to create a channel and get it if successful. | |
1815 | * | |
1816 | * Return 0 on success or else a negative value. | |
1817 | */ | |
1818 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
1819 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
1820 | int bitness, struct ust_registry_session *registry) | |
1821 | { | |
1822 | int ret; | |
1823 | unsigned int nb_fd = 0; | |
1824 | struct consumer_socket *socket; | |
1825 | ||
1826 | assert(usess); | |
1827 | assert(ua_sess); | |
1828 | assert(ua_chan); | |
1829 | assert(registry); | |
1830 | ||
1831 | rcu_read_lock(); | |
1832 | health_code_update(); | |
1833 | ||
1834 | /* Get the right consumer socket for the application. */ | |
1835 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
1836 | if (!socket) { | |
1837 | ret = -EINVAL; | |
1838 | goto error; | |
1839 | } | |
1840 | ||
1841 | health_code_update(); | |
1842 | ||
1843 | /* Need one fd for the channel. */ | |
1844 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
1845 | if (ret < 0) { | |
1846 | ERR("Exhausted number of available FD upon create channel"); | |
1847 | goto error; | |
1848 | } | |
1849 | ||
1850 | /* | |
1851 | * Ask consumer to create channel. The consumer will return the number of | |
1852 | * stream we have to expect. | |
1853 | */ | |
1854 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
1855 | registry); | |
1856 | if (ret < 0) { | |
1857 | goto error_ask; | |
1858 | } | |
1859 | ||
1860 | /* | |
1861 | * Compute the number of fd needed before receiving them. It must be 2 per | |
1862 | * stream (2 being the default value here). | |
1863 | */ | |
1864 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
1865 | ||
1866 | /* Reserve the amount of file descriptor we need. */ | |
1867 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
1868 | if (ret < 0) { | |
1869 | ERR("Exhausted number of available FD upon create channel"); | |
1870 | goto error_fd_get_stream; | |
1871 | } | |
1872 | ||
1873 | health_code_update(); | |
1874 | ||
1875 | /* | |
1876 | * Now get the channel from the consumer. This call wil populate the stream | |
1877 | * list of that channel and set the ust objects. | |
1878 | */ | |
1879 | ret = ust_consumer_get_channel(socket, ua_chan); | |
1880 | if (ret < 0) { | |
1881 | goto error_destroy; | |
1882 | } | |
1883 | ||
1884 | rcu_read_unlock(); | |
1885 | return 0; | |
1886 | ||
1887 | error_destroy: | |
1888 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
1889 | error_fd_get_stream: | |
1890 | /* | |
1891 | * Initiate a destroy channel on the consumer since we had an error | |
1892 | * handling it on our side. The return value is of no importance since we | |
1893 | * already have a ret value set by the previous error that we need to | |
1894 | * return. | |
1895 | */ | |
1896 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
1897 | error_ask: | |
1898 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
1899 | error: | |
1900 | health_code_update(); | |
1901 | rcu_read_unlock(); | |
1902 | return ret; | |
1903 | } | |
1904 | ||
1905 | /* | |
1906 | * Duplicate the ust data object of the ust app stream and save it in the | |
1907 | * buffer registry stream. | |
1908 | * | |
1909 | * Return 0 on success or else a negative value. | |
1910 | */ | |
1911 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
1912 | struct ust_app_stream *stream) | |
1913 | { | |
1914 | int ret; | |
1915 | ||
1916 | assert(reg_stream); | |
1917 | assert(stream); | |
1918 | ||
1919 | /* Reserve the amount of file descriptor we need. */ | |
1920 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
1921 | if (ret < 0) { | |
1922 | ERR("Exhausted number of available FD upon duplicate stream"); | |
1923 | goto error; | |
1924 | } | |
1925 | ||
1926 | /* Duplicate object for stream once the original is in the registry. */ | |
1927 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
1928 | reg_stream->obj.ust); | |
1929 | if (ret < 0) { | |
1930 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
1931 | reg_stream->obj.ust, stream->obj, ret); | |
1932 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
1933 | goto error; | |
1934 | } | |
1935 | stream->handle = stream->obj->handle; | |
1936 | ||
1937 | error: | |
1938 | return ret; | |
1939 | } | |
1940 | ||
1941 | /* | |
1942 | * Duplicate the ust data object of the ust app. channel and save it in the | |
1943 | * buffer registry channel. | |
1944 | * | |
1945 | * Return 0 on success or else a negative value. | |
1946 | */ | |
1947 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
1948 | struct ust_app_channel *ua_chan) | |
1949 | { | |
1950 | int ret; | |
1951 | ||
1952 | assert(reg_chan); | |
1953 | assert(ua_chan); | |
1954 | ||
1955 | /* Need two fds for the channel. */ | |
1956 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
1957 | if (ret < 0) { | |
1958 | ERR("Exhausted number of available FD upon duplicate channel"); | |
1959 | goto error_fd_get; | |
1960 | } | |
1961 | ||
1962 | /* Duplicate object for stream once the original is in the registry. */ | |
1963 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
1964 | if (ret < 0) { | |
1965 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
1966 | reg_chan->obj.ust, ua_chan->obj, ret); | |
1967 | goto error; | |
1968 | } | |
1969 | ua_chan->handle = ua_chan->obj->handle; | |
1970 | ||
1971 | return 0; | |
1972 | ||
1973 | error: | |
1974 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
1975 | error_fd_get: | |
1976 | return ret; | |
1977 | } | |
1978 | ||
1979 | /* | |
1980 | * For a given channel buffer registry, setup all streams of the given ust | |
1981 | * application channel. | |
1982 | * | |
1983 | * Return 0 on success or else a negative value. | |
1984 | */ | |
1985 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
1986 | struct ust_app_channel *ua_chan) | |
1987 | { | |
1988 | int ret = 0; | |
1989 | struct ust_app_stream *stream, *stmp; | |
1990 | ||
1991 | assert(reg_chan); | |
1992 | assert(ua_chan); | |
1993 | ||
1994 | DBG2("UST app setup buffer registry stream"); | |
1995 | ||
1996 | /* Send all streams to application. */ | |
1997 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1998 | struct buffer_reg_stream *reg_stream; | |
1999 | ||
2000 | ret = buffer_reg_stream_create(®_stream); | |
2001 | if (ret < 0) { | |
2002 | goto error; | |
2003 | } | |
2004 | ||
2005 | /* | |
2006 | * Keep original pointer and nullify it in the stream so the delete | |
2007 | * stream call does not release the object. | |
2008 | */ | |
2009 | reg_stream->obj.ust = stream->obj; | |
2010 | stream->obj = NULL; | |
2011 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2012 | |
7972aab2 DG |
2013 | /* We don't need the streams anymore. */ |
2014 | cds_list_del(&stream->list); | |
2015 | delete_ust_app_stream(-1, stream); | |
2016 | } | |
421cb601 | 2017 | |
7972aab2 DG |
2018 | error: |
2019 | return ret; | |
2020 | } | |
2021 | ||
2022 | /* | |
2023 | * Create a buffer registry channel for the given session registry and | |
2024 | * application channel object. If regp pointer is valid, it's set with the | |
2025 | * created object. Important, the created object is NOT added to the session | |
2026 | * registry hash table. | |
2027 | * | |
2028 | * Return 0 on success else a negative value. | |
2029 | */ | |
2030 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2031 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2032 | { | |
2033 | int ret; | |
2034 | struct buffer_reg_channel *reg_chan = NULL; | |
2035 | ||
2036 | assert(reg_sess); | |
2037 | assert(ua_chan); | |
2038 | ||
2039 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2040 | ||
2041 | /* Create buffer registry channel. */ | |
2042 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2043 | if (ret < 0) { | |
2044 | goto error_create; | |
421cb601 | 2045 | } |
7972aab2 DG |
2046 | assert(reg_chan); |
2047 | reg_chan->consumer_key = ua_chan->key; | |
421cb601 | 2048 | |
7972aab2 DG |
2049 | /* Create and add a channel registry to session. */ |
2050 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2051 | ua_chan->tracing_channel_id); | |
2052 | if (ret < 0) { | |
2053 | goto error; | |
d88aee68 | 2054 | } |
7972aab2 | 2055 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2056 | |
7972aab2 DG |
2057 | if (regp) { |
2058 | *regp = reg_chan; | |
3d8ca23b | 2059 | } |
d88aee68 | 2060 | |
7972aab2 | 2061 | return 0; |
3d8ca23b DG |
2062 | |
2063 | error: | |
7972aab2 DG |
2064 | /* Safe because the registry channel object was not added to any HT. */ |
2065 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2066 | error_create: | |
3d8ca23b | 2067 | return ret; |
421cb601 DG |
2068 | } |
2069 | ||
55cc08a6 | 2070 | /* |
7972aab2 DG |
2071 | * Setup buffer registry channel for the given session registry and application |
2072 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2073 | * |
7972aab2 | 2074 | * Return 0 on success else a negative value. |
55cc08a6 | 2075 | */ |
7972aab2 DG |
2076 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2077 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2078 | { |
7972aab2 | 2079 | int ret; |
55cc08a6 | 2080 | |
7972aab2 DG |
2081 | assert(reg_sess); |
2082 | assert(reg_chan); | |
2083 | assert(ua_chan); | |
2084 | assert(ua_chan->obj); | |
55cc08a6 | 2085 | |
7972aab2 | 2086 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2087 | |
7972aab2 DG |
2088 | /* Setup all streams for the registry. */ |
2089 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2090 | if (ret < 0) { | |
55cc08a6 DG |
2091 | goto error; |
2092 | } | |
2093 | ||
7972aab2 DG |
2094 | reg_chan->obj.ust = ua_chan->obj; |
2095 | ua_chan->obj = NULL; | |
55cc08a6 | 2096 | |
7972aab2 | 2097 | return 0; |
55cc08a6 DG |
2098 | |
2099 | error: | |
7972aab2 DG |
2100 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2101 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2102 | return ret; |
2103 | } | |
2104 | ||
edb67388 | 2105 | /* |
7972aab2 | 2106 | * Send buffer registry channel to the application. |
d0b96690 | 2107 | * |
7972aab2 | 2108 | * Return 0 on success else a negative value. |
edb67388 | 2109 | */ |
7972aab2 DG |
2110 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2111 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2112 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2113 | { |
2114 | int ret; | |
7972aab2 | 2115 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2116 | |
7972aab2 DG |
2117 | assert(reg_chan); |
2118 | assert(app); | |
2119 | assert(ua_sess); | |
2120 | assert(ua_chan); | |
2121 | ||
2122 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2123 | ||
2124 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2125 | if (ret < 0) { |
2126 | goto error; | |
2127 | } | |
2128 | ||
7972aab2 DG |
2129 | /* Send channel to the application. */ |
2130 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2131 | if (ret < 0) { | |
2132 | goto error; | |
2133 | } | |
2134 | ||
2135 | health_code_update(); | |
2136 | ||
2137 | /* Send all streams to application. */ | |
2138 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2139 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2140 | struct ust_app_stream stream; | |
2141 | ||
2142 | ret = duplicate_stream_object(reg_stream, &stream); | |
2143 | if (ret < 0) { | |
2144 | goto error_stream_unlock; | |
2145 | } | |
2146 | ||
2147 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2148 | if (ret < 0) { | |
2149 | goto error_stream_unlock; | |
2150 | } | |
edb67388 | 2151 | |
7972aab2 DG |
2152 | /* |
2153 | * The return value is not important here. This function will output an | |
2154 | * error if needed. | |
2155 | */ | |
2156 | (void) release_ust_app_stream(-1, &stream); | |
2157 | } | |
2158 | ua_chan->is_sent = 1; | |
2159 | ||
2160 | error_stream_unlock: | |
2161 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2162 | error: |
2163 | return ret; | |
2164 | } | |
2165 | ||
9730260e | 2166 | /* |
7972aab2 DG |
2167 | * Create and send to the application the created buffers with per UID buffers. |
2168 | * | |
2169 | * Return 0 on success else a negative value. | |
9730260e | 2170 | */ |
7972aab2 DG |
2171 | static int create_channel_per_uid(struct ust_app *app, |
2172 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2173 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2174 | { |
2175 | int ret; | |
7972aab2 DG |
2176 | struct buffer_reg_uid *reg_uid; |
2177 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2178 | |
7972aab2 DG |
2179 | assert(app); |
2180 | assert(usess); | |
2181 | assert(ua_sess); | |
2182 | assert(ua_chan); | |
2183 | ||
2184 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2185 | ||
2186 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2187 | /* | |
2188 | * The session creation handles the creation of this global registry | |
2189 | * object. If none can be find, there is a code flow problem or a | |
2190 | * teardown race. | |
2191 | */ | |
2192 | assert(reg_uid); | |
2193 | ||
2194 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2195 | reg_uid); | |
2196 | if (!reg_chan) { | |
2197 | /* Create the buffer registry channel object. */ | |
2198 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2199 | if (ret < 0) { | |
2200 | goto error; | |
2201 | } | |
2202 | assert(reg_chan); | |
2203 | ||
2204 | /* | |
2205 | * Create the buffers on the consumer side. This call populates the | |
2206 | * ust app channel object with all streams and data object. | |
2207 | */ | |
2208 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2209 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2210 | if (ret < 0) { | |
2211 | goto error; | |
2212 | } | |
2213 | ||
2214 | /* | |
2215 | * Setup the streams and add it to the session registry. | |
2216 | */ | |
2217 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2218 | if (ret < 0) { | |
2219 | goto error; | |
2220 | } | |
2221 | ||
2222 | } | |
2223 | ||
2224 | /* Send buffers to the application. */ | |
2225 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2226 | if (ret < 0) { |
2227 | goto error; | |
2228 | } | |
2229 | ||
9730260e DG |
2230 | error: |
2231 | return ret; | |
2232 | } | |
2233 | ||
78f0bacd | 2234 | /* |
7972aab2 DG |
2235 | * Create and send to the application the created buffers with per PID buffers. |
2236 | * | |
2237 | * Return 0 on success else a negative value. | |
78f0bacd | 2238 | */ |
7972aab2 DG |
2239 | static int create_channel_per_pid(struct ust_app *app, |
2240 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2241 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2242 | { |
8535a6d9 | 2243 | int ret; |
7972aab2 | 2244 | struct ust_registry_session *registry; |
78f0bacd | 2245 | |
7972aab2 DG |
2246 | assert(app); |
2247 | assert(usess); | |
2248 | assert(ua_sess); | |
2249 | assert(ua_chan); | |
2250 | ||
2251 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2252 | ||
2253 | rcu_read_lock(); | |
2254 | ||
2255 | registry = get_session_registry(ua_sess); | |
2256 | assert(registry); | |
2257 | ||
2258 | /* Create and add a new channel registry to session. */ | |
2259 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2260 | if (ret < 0) { |
2261 | goto error; | |
2262 | } | |
2263 | ||
7972aab2 DG |
2264 | /* Create and get channel on the consumer side. */ |
2265 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2266 | app->bits_per_long, registry); | |
2267 | if (ret < 0) { | |
2268 | goto error; | |
2269 | } | |
2270 | ||
2271 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2272 | if (ret < 0) { | |
2273 | goto error; | |
2274 | } | |
8535a6d9 | 2275 | |
78f0bacd | 2276 | error: |
7972aab2 | 2277 | rcu_read_unlock(); |
78f0bacd DG |
2278 | return ret; |
2279 | } | |
2280 | ||
2281 | /* | |
7972aab2 DG |
2282 | * From an already allocated ust app channel, create the channel buffers if |
2283 | * need and send it to the application. This MUST be called with a RCU read | |
2284 | * side lock acquired. | |
2285 | * | |
2286 | * Return 0 on success or else a negative value. | |
78f0bacd | 2287 | */ |
7972aab2 DG |
2288 | static int do_create_channel(struct ust_app *app, |
2289 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2290 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2291 | { |
7972aab2 | 2292 | int ret; |
78f0bacd | 2293 | |
7972aab2 DG |
2294 | assert(app); |
2295 | assert(usess); | |
2296 | assert(ua_sess); | |
2297 | assert(ua_chan); | |
2298 | ||
2299 | /* Handle buffer type before sending the channel to the application. */ | |
2300 | switch (usess->buffer_type) { | |
2301 | case LTTNG_BUFFER_PER_UID: | |
2302 | { | |
2303 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2304 | if (ret < 0) { | |
2305 | goto error; | |
2306 | } | |
2307 | break; | |
2308 | } | |
2309 | case LTTNG_BUFFER_PER_PID: | |
2310 | { | |
2311 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2312 | if (ret < 0) { | |
2313 | goto error; | |
2314 | } | |
2315 | break; | |
2316 | } | |
2317 | default: | |
2318 | assert(0); | |
2319 | ret = -EINVAL; | |
78f0bacd DG |
2320 | goto error; |
2321 | } | |
2322 | ||
7972aab2 DG |
2323 | /* Initialize ust objd object using the received handle and add it. */ |
2324 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2325 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2326 | |
7972aab2 DG |
2327 | /* If channel is not enabled, disable it on the tracer */ |
2328 | if (!ua_chan->enabled) { | |
2329 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2330 | if (ret < 0) { | |
2331 | goto error; | |
2332 | } | |
78f0bacd DG |
2333 | } |
2334 | ||
2335 | error: | |
2336 | return ret; | |
2337 | } | |
2338 | ||
284d8f55 | 2339 | /* |
4d710ac2 DG |
2340 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2341 | * newly created channel if not NULL. | |
d0b96690 DG |
2342 | * |
2343 | * Called with UST app session lock held. | |
7972aab2 DG |
2344 | * |
2345 | * Return 0 on success or else a negative value. | |
284d8f55 | 2346 | */ |
4d710ac2 DG |
2347 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2348 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2349 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2350 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2351 | { |
2352 | int ret = 0; | |
bec39940 DG |
2353 | struct lttng_ht_iter iter; |
2354 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2355 | struct ust_app_channel *ua_chan; |
2356 | ||
2357 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2358 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2359 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2360 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2361 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2362 | goto end; |
5b4a0ec0 DG |
2363 | } |
2364 | ||
d0b96690 | 2365 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2366 | if (ua_chan == NULL) { |
2367 | /* Only malloc can fail here */ | |
4d710ac2 | 2368 | ret = -ENOMEM; |
fc34caaa DG |
2369 | goto error; |
2370 | } | |
2371 | shadow_copy_channel(ua_chan, uchan); | |
2372 | ||
ffe60014 DG |
2373 | /* Set channel type. */ |
2374 | ua_chan->attr.type = type; | |
2375 | ||
7972aab2 | 2376 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2377 | if (ret < 0) { |
2378 | goto error; | |
2379 | } | |
2380 | ||
fc34caaa | 2381 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2382 | app->pid); |
fc34caaa | 2383 | |
d0b96690 DG |
2384 | /* Only add the channel if successful on the tracer side. */ |
2385 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2386 | ||
fc34caaa | 2387 | end: |
4d710ac2 DG |
2388 | if (ua_chanp) { |
2389 | *ua_chanp = ua_chan; | |
2390 | } | |
2391 | ||
2392 | /* Everything went well. */ | |
2393 | return 0; | |
5b4a0ec0 DG |
2394 | |
2395 | error: | |
d0b96690 | 2396 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
4d710ac2 | 2397 | return ret; |
5b4a0ec0 DG |
2398 | } |
2399 | ||
2400 | /* | |
2401 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2402 | * |
2403 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2404 | */ |
edb67388 DG |
2405 | static |
2406 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2407 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2408 | struct ust_app *app) | |
284d8f55 | 2409 | { |
edb67388 | 2410 | int ret = 0; |
5b4a0ec0 | 2411 | struct ust_app_event *ua_event; |
284d8f55 | 2412 | |
5b4a0ec0 | 2413 | /* Get event node */ |
18eace3b DG |
2414 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
2415 | uevent->filter, uevent->attr.loglevel); | |
2416 | if (ua_event != NULL) { | |
fc34caaa | 2417 | ret = -EEXIST; |
edb67388 DG |
2418 | goto end; |
2419 | } | |
5b4a0ec0 | 2420 | |
edb67388 DG |
2421 | /* Does not exist so create one */ |
2422 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2423 | if (ua_event == NULL) { | |
2424 | /* Only malloc can failed so something is really wrong */ | |
2425 | ret = -ENOMEM; | |
fc34caaa | 2426 | goto end; |
5b4a0ec0 | 2427 | } |
edb67388 | 2428 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2429 | |
edb67388 | 2430 | /* Create it on the tracer side */ |
5b4a0ec0 | 2431 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2432 | if (ret < 0) { |
fc34caaa | 2433 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2434 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2435 | goto error; |
2436 | } | |
2437 | ||
d0b96690 | 2438 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2439 | |
fc34caaa | 2440 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2441 | app->pid); |
7f79d3a1 | 2442 | |
edb67388 | 2443 | end: |
fc34caaa DG |
2444 | return ret; |
2445 | ||
5b4a0ec0 | 2446 | error: |
fc34caaa DG |
2447 | /* Valid. Calling here is already in a read side lock */ |
2448 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2449 | return ret; |
5b4a0ec0 DG |
2450 | } |
2451 | ||
2452 | /* | |
2453 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2454 | * |
7972aab2 | 2455 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2456 | */ |
2457 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
d65d2de8 DG |
2458 | struct ust_app *app, struct consumer_output *consumer, |
2459 | struct ustctl_consumer_channel_attr *attr) | |
5b4a0ec0 DG |
2460 | { |
2461 | int ret = 0; | |
ffe60014 | 2462 | struct ust_app_channel *metadata; |
d88aee68 | 2463 | struct consumer_socket *socket; |
7972aab2 | 2464 | struct ust_registry_session *registry; |
5b4a0ec0 | 2465 | |
ffe60014 DG |
2466 | assert(ua_sess); |
2467 | assert(app); | |
d88aee68 | 2468 | assert(consumer); |
5b4a0ec0 | 2469 | |
7972aab2 DG |
2470 | registry = get_session_registry(ua_sess); |
2471 | assert(registry); | |
2472 | ||
2473 | /* Metadata already exists for this registry. */ | |
2474 | if (registry->metadata_key) { | |
2475 | ret = 0; | |
2476 | goto error; | |
5b4a0ec0 DG |
2477 | } |
2478 | ||
ffe60014 | 2479 | /* Allocate UST metadata */ |
d0b96690 | 2480 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2481 | if (!metadata) { |
2482 | /* malloc() failed */ | |
2483 | ret = -ENOMEM; | |
2484 | goto error; | |
2485 | } | |
5b4a0ec0 | 2486 | |
d65d2de8 DG |
2487 | if (!attr) { |
2488 | /* Set default attributes for metadata. */ | |
2489 | metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
2490 | metadata->attr.subbuf_size = default_get_metadata_subbuf_size(); | |
2491 | metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
2492 | metadata->attr.switch_timer_interval = DEFAULT_UST_CHANNEL_SWITCH_TIMER; | |
2493 | metadata->attr.read_timer_interval = DEFAULT_UST_CHANNEL_READ_TIMER; | |
2494 | metadata->attr.output = LTTNG_UST_MMAP; | |
2495 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2496 | } else { | |
2497 | memcpy(&metadata->attr, attr, sizeof(metadata->attr)); | |
2498 | metadata->attr.output = LTTNG_UST_MMAP; | |
2499 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2500 | } | |
5b4a0ec0 | 2501 | |
d88aee68 | 2502 | /* Get the right consumer socket for the application. */ |
7972aab2 | 2503 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); |
d88aee68 DG |
2504 | if (!socket) { |
2505 | ret = -EINVAL; | |
2506 | goto error_consumer; | |
2507 | } | |
2508 | ||
7972aab2 DG |
2509 | /* Need one fd for the channel. */ |
2510 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2511 | if (ret < 0) { | |
2512 | ERR("Exhausted number of available FD upon create metadata"); | |
2513 | goto error; | |
2514 | } | |
2515 | ||
331744e3 JD |
2516 | /* |
2517 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2518 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2519 | * consumer requesting the metadata and the ask_channel call on our side | |
2520 | * did not returned yet. | |
2521 | */ | |
2522 | registry->metadata_key = metadata->key; | |
2523 | ||
d88aee68 DG |
2524 | /* |
2525 | * Ask the metadata channel creation to the consumer. The metadata object | |
2526 | * will be created by the consumer and kept their. However, the stream is | |
2527 | * never added or monitored until we do a first push metadata to the | |
2528 | * consumer. | |
2529 | */ | |
7972aab2 DG |
2530 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2531 | registry); | |
d88aee68 | 2532 | if (ret < 0) { |
7972aab2 DG |
2533 | /* |
2534 | * Safe because the metadata obj pointer is not set so the delete below | |
2535 | * will not put a FD back again. | |
2536 | */ | |
2537 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
d88aee68 DG |
2538 | goto error_consumer; |
2539 | } | |
2540 | ||
2541 | /* | |
2542 | * The setup command will make the metadata stream be sent to the relayd, | |
2543 | * if applicable, and the thread managing the metadatas. This is important | |
2544 | * because after this point, if an error occurs, the only way the stream | |
2545 | * can be deleted is to be monitored in the consumer. | |
2546 | */ | |
7972aab2 | 2547 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2548 | if (ret < 0) { |
7972aab2 DG |
2549 | /* |
2550 | * Safe because the metadata obj pointer is not set so the delete below | |
2551 | * will not put a FD back again. | |
2552 | */ | |
2553 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
d88aee68 | 2554 | goto error_consumer; |
5b4a0ec0 DG |
2555 | } |
2556 | ||
7972aab2 DG |
2557 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2558 | metadata->key, app->pid); | |
5b4a0ec0 | 2559 | |
d88aee68 DG |
2560 | error_consumer: |
2561 | delete_ust_app_channel(-1, metadata, app); | |
5b4a0ec0 | 2562 | error: |
ffe60014 | 2563 | return ret; |
5b4a0ec0 DG |
2564 | } |
2565 | ||
2566 | /* | |
2567 | * Return pointer to traceable apps list. | |
2568 | */ | |
bec39940 | 2569 | struct lttng_ht *ust_app_get_ht(void) |
5b4a0ec0 DG |
2570 | { |
2571 | return ust_app_ht; | |
2572 | } | |
2573 | ||
2574 | /* | |
d88aee68 DG |
2575 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2576 | * acquired before calling this function. | |
5b4a0ec0 DG |
2577 | */ |
2578 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2579 | { | |
d88aee68 | 2580 | struct ust_app *app = NULL; |
bec39940 DG |
2581 | struct lttng_ht_node_ulong *node; |
2582 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2583 | |
bec39940 DG |
2584 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2585 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2586 | if (node == NULL) { |
2587 | DBG2("UST app no found with pid %d", pid); | |
2588 | goto error; | |
2589 | } | |
5b4a0ec0 DG |
2590 | |
2591 | DBG2("Found UST app by pid %d", pid); | |
2592 | ||
d88aee68 | 2593 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2594 | |
2595 | error: | |
d88aee68 | 2596 | return app; |
5b4a0ec0 DG |
2597 | } |
2598 | ||
d88aee68 DG |
2599 | /* |
2600 | * Allocate and init an UST app object using the registration information and | |
2601 | * the command socket. This is called when the command socket connects to the | |
2602 | * session daemon. | |
2603 | * | |
2604 | * The object is returned on success or else NULL. | |
2605 | */ | |
d0b96690 | 2606 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2607 | { |
d0b96690 DG |
2608 | struct ust_app *lta = NULL; |
2609 | ||
2610 | assert(msg); | |
2611 | assert(sock >= 0); | |
2612 | ||
2613 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2614 | |
173af62f DG |
2615 | if ((msg->bits_per_long == 64 && |
2616 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2617 | || (msg->bits_per_long == 32 && | |
2618 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2619 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2620 | "%d-bit long, but no consumerd for this size is available.\n", |
2621 | msg->name, msg->pid, msg->bits_per_long); | |
2622 | goto error; | |
3f2c5fcc | 2623 | } |
d0b96690 | 2624 | |
5b4a0ec0 DG |
2625 | lta = zmalloc(sizeof(struct ust_app)); |
2626 | if (lta == NULL) { | |
2627 | PERROR("malloc"); | |
d0b96690 | 2628 | goto error; |
5b4a0ec0 DG |
2629 | } |
2630 | ||
2631 | lta->ppid = msg->ppid; | |
2632 | lta->uid = msg->uid; | |
2633 | lta->gid = msg->gid; | |
d0b96690 | 2634 | |
7753dea8 | 2635 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2636 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2637 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2638 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2639 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2640 | lta->long_alignment = msg->long_alignment; | |
2641 | lta->byte_order = msg->byte_order; | |
2642 | ||
5b4a0ec0 DG |
2643 | lta->v_major = msg->major; |
2644 | lta->v_minor = msg->minor; | |
bec39940 | 2645 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 DG |
2646 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2647 | lta->notify_sock = -1; | |
d88aee68 DG |
2648 | |
2649 | /* Copy name and make sure it's NULL terminated. */ | |
2650 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2651 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2652 | ||
2653 | /* | |
2654 | * Before this can be called, when receiving the registration information, | |
2655 | * the application compatibility is checked. So, at this point, the | |
2656 | * application can work with this session daemon. | |
2657 | */ | |
d0b96690 | 2658 | lta->compatible = 1; |
5b4a0ec0 | 2659 | |
852d0037 | 2660 | lta->pid = msg->pid; |
d0b96690 | 2661 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2662 | lta->sock = sock; |
d0b96690 | 2663 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2664 | |
d42f20df DG |
2665 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2666 | ||
d0b96690 DG |
2667 | error: |
2668 | return lta; | |
2669 | } | |
2670 | ||
d88aee68 DG |
2671 | /* |
2672 | * For a given application object, add it to every hash table. | |
2673 | */ | |
d0b96690 DG |
2674 | void ust_app_add(struct ust_app *app) |
2675 | { | |
2676 | assert(app); | |
2677 | assert(app->notify_sock >= 0); | |
2678 | ||
5b4a0ec0 | 2679 | rcu_read_lock(); |
852d0037 DG |
2680 | |
2681 | /* | |
2682 | * On a re-registration, we want to kick out the previous registration of | |
2683 | * that pid | |
2684 | */ | |
d0b96690 | 2685 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
2686 | |
2687 | /* | |
2688 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
2689 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
2690 | * already in the table. | |
2691 | */ | |
d0b96690 | 2692 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 2693 | |
d0b96690 DG |
2694 | /* Add application to the notify socket hash table. */ |
2695 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
2696 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 2697 | |
d0b96690 | 2698 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
2699 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
2700 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
2701 | app->v_minor); | |
5b4a0ec0 | 2702 | |
d0b96690 DG |
2703 | rcu_read_unlock(); |
2704 | } | |
2705 | ||
d88aee68 DG |
2706 | /* |
2707 | * Set the application version into the object. | |
2708 | * | |
2709 | * Return 0 on success else a negative value either an errno code or a | |
2710 | * LTTng-UST error code. | |
2711 | */ | |
d0b96690 DG |
2712 | int ust_app_version(struct ust_app *app) |
2713 | { | |
d88aee68 DG |
2714 | int ret; |
2715 | ||
d0b96690 | 2716 | assert(app); |
d88aee68 DG |
2717 | |
2718 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2719 | if (ret < 0) { | |
2720 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2721 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2722 | } else { | |
2723 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2724 | } | |
2725 | } | |
2726 | ||
2727 | return ret; | |
5b4a0ec0 DG |
2728 | } |
2729 | ||
2730 | /* | |
2731 | * Unregister app by removing it from the global traceable app list and freeing | |
2732 | * the data struct. | |
2733 | * | |
2734 | * The socket is already closed at this point so no close to sock. | |
2735 | */ | |
2736 | void ust_app_unregister(int sock) | |
2737 | { | |
2738 | struct ust_app *lta; | |
bec39940 DG |
2739 | struct lttng_ht_node_ulong *node; |
2740 | struct lttng_ht_iter iter; | |
d42f20df | 2741 | struct ust_app_session *ua_sess; |
525b0740 | 2742 | int ret; |
5b4a0ec0 DG |
2743 | |
2744 | rcu_read_lock(); | |
886459c6 | 2745 | |
5b4a0ec0 | 2746 | /* Get the node reference for a call_rcu */ |
852d0037 | 2747 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 2748 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 2749 | assert(node); |
284d8f55 | 2750 | |
852d0037 | 2751 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
2752 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
2753 | ||
886459c6 | 2754 | /* Remove application from PID hash table */ |
852d0037 DG |
2755 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
2756 | assert(!ret); | |
2757 | ||
d88aee68 DG |
2758 | /* |
2759 | * Remove application from notify hash table. The thread handling the | |
2760 | * notify socket could have deleted the node so ignore on error because | |
2761 | * either way it's valid. The close of that socket is handled by the other | |
2762 | * thread. | |
2763 | */ | |
d0b96690 | 2764 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 2765 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 2766 | |
5b98a774 DG |
2767 | /* |
2768 | * Ignore return value since the node might have been removed before by an | |
2769 | * add replace during app registration because the PID can be reassigned by | |
2770 | * the OS. | |
2771 | */ | |
d0b96690 | 2772 | iter.iter.node = <a->pid_n.node; |
bec39940 | 2773 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
2774 | if (ret) { |
2775 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
2776 | lta->pid); | |
2777 | } | |
852d0037 | 2778 | |
d42f20df DG |
2779 | /* Remove sessions so they are not visible during deletion.*/ |
2780 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
2781 | node.node) { | |
7972aab2 DG |
2782 | struct ust_registry_session *registry; |
2783 | ||
d42f20df DG |
2784 | ret = lttng_ht_del(lta->sessions, &iter); |
2785 | if (ret) { | |
2786 | /* The session was already removed so scheduled for teardown. */ | |
2787 | continue; | |
2788 | } | |
2789 | ||
2790 | /* | |
2791 | * Add session to list for teardown. This is safe since at this point we | |
2792 | * are the only one using this list. | |
2793 | */ | |
d88aee68 DG |
2794 | pthread_mutex_lock(&ua_sess->lock); |
2795 | ||
2796 | /* | |
2797 | * Normally, this is done in the delete session process which is | |
2798 | * executed in the call rcu below. However, upon registration we can't | |
2799 | * afford to wait for the grace period before pushing data or else the | |
2800 | * data pending feature can race between the unregistration and stop | |
2801 | * command where the data pending command is sent *before* the grace | |
2802 | * period ended. | |
2803 | * | |
2804 | * The close metadata below nullifies the metadata pointer in the | |
2805 | * session so the delete session will NOT push/close a second time. | |
2806 | */ | |
7972aab2 DG |
2807 | registry = get_session_registry(ua_sess); |
2808 | if (registry) { | |
2809 | /* Push metadata for application before freeing the application. */ | |
2810 | (void) push_metadata(registry, ua_sess->consumer); | |
2811 | ||
2812 | /* | |
2813 | * Don't ask to close metadata for global per UID buffers. Close | |
2814 | * metadata only on destroy trace session in this case. | |
2815 | */ | |
2816 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { | |
2817 | /* And ask to close it for this session registry. */ | |
2818 | (void) close_metadata(registry, ua_sess->consumer); | |
2819 | } | |
2820 | } | |
d88aee68 | 2821 | |
d42f20df | 2822 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 2823 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
2824 | } |
2825 | ||
852d0037 DG |
2826 | /* Free memory */ |
2827 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
2828 | ||
5b4a0ec0 DG |
2829 | rcu_read_unlock(); |
2830 | return; | |
284d8f55 DG |
2831 | } |
2832 | ||
2833 | /* | |
5b4a0ec0 | 2834 | * Return traceable_app_count |
284d8f55 | 2835 | */ |
5b4a0ec0 | 2836 | unsigned long ust_app_list_count(void) |
284d8f55 | 2837 | { |
5b4a0ec0 | 2838 | unsigned long count; |
284d8f55 | 2839 | |
5b4a0ec0 | 2840 | rcu_read_lock(); |
bec39940 | 2841 | count = lttng_ht_get_count(ust_app_ht); |
5b4a0ec0 | 2842 | rcu_read_unlock(); |
284d8f55 | 2843 | |
5b4a0ec0 | 2844 | return count; |
284d8f55 DG |
2845 | } |
2846 | ||
5b4a0ec0 DG |
2847 | /* |
2848 | * Fill events array with all events name of all registered apps. | |
2849 | */ | |
2850 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 2851 | { |
5b4a0ec0 DG |
2852 | int ret, handle; |
2853 | size_t nbmem, count = 0; | |
bec39940 | 2854 | struct lttng_ht_iter iter; |
5b4a0ec0 | 2855 | struct ust_app *app; |
c617c0c6 | 2856 | struct lttng_event *tmp_event; |
421cb601 | 2857 | |
5b4a0ec0 | 2858 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
2859 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
2860 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
2861 | PERROR("zmalloc ust app events"); |
2862 | ret = -ENOMEM; | |
421cb601 DG |
2863 | goto error; |
2864 | } | |
2865 | ||
5b4a0ec0 | 2866 | rcu_read_lock(); |
421cb601 | 2867 | |
852d0037 | 2868 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 2869 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 2870 | |
840cb59c | 2871 | health_code_update(); |
86acf0da | 2872 | |
e0c7ec2b DG |
2873 | if (!app->compatible) { |
2874 | /* | |
2875 | * TODO: In time, we should notice the caller of this error by | |
2876 | * telling him that this is a version error. | |
2877 | */ | |
2878 | continue; | |
2879 | } | |
852d0037 | 2880 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 2881 | if (handle < 0) { |
ffe60014 DG |
2882 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
2883 | ERR("UST app list events getting handle failed for app pid %d", | |
2884 | app->pid); | |
2885 | } | |
5b4a0ec0 DG |
2886 | continue; |
2887 | } | |
421cb601 | 2888 | |
852d0037 | 2889 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 2890 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
2891 | /* Handle ustctl error. */ |
2892 | if (ret < 0) { | |
2893 | free(tmp_event); | |
2894 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
2895 | ERR("UST app tp list get failed for app %d with ret %d", | |
2896 | app->sock, ret); | |
2897 | } else { | |
2898 | DBG3("UST app tp list get failed. Application is dead"); | |
2899 | } | |
2900 | goto rcu_error; | |
2901 | } | |
2902 | ||
840cb59c | 2903 | health_code_update(); |
815564d8 | 2904 | if (count >= nbmem) { |
d7b3776f | 2905 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
2906 | void *ptr; |
2907 | ||
815564d8 MD |
2908 | DBG2("Reallocating event list from %zu to %zu entries", nbmem, |
2909 | 2 * nbmem); | |
2910 | nbmem *= 2; | |
c617c0c6 MD |
2911 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event)); |
2912 | if (ptr == NULL) { | |
5b4a0ec0 | 2913 | PERROR("realloc ust app events"); |
c617c0c6 | 2914 | free(tmp_event); |
5b4a0ec0 DG |
2915 | ret = -ENOMEM; |
2916 | goto rcu_error; | |
2917 | } | |
c617c0c6 | 2918 | tmp_event = ptr; |
5b4a0ec0 | 2919 | } |
c617c0c6 MD |
2920 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
2921 | tmp_event[count].loglevel = uiter.loglevel; | |
2922 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
2923 | tmp_event[count].pid = app->pid; | |
2924 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 2925 | count++; |
421cb601 | 2926 | } |
421cb601 DG |
2927 | } |
2928 | ||
5b4a0ec0 | 2929 | ret = count; |
c617c0c6 | 2930 | *events = tmp_event; |
421cb601 | 2931 | |
5b4a0ec0 | 2932 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 2933 | |
5b4a0ec0 DG |
2934 | rcu_error: |
2935 | rcu_read_unlock(); | |
421cb601 | 2936 | error: |
840cb59c | 2937 | health_code_update(); |
5b4a0ec0 | 2938 | return ret; |
421cb601 DG |
2939 | } |
2940 | ||
f37d259d MD |
2941 | /* |
2942 | * Fill events array with all events name of all registered apps. | |
2943 | */ | |
2944 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
2945 | { | |
2946 | int ret, handle; | |
2947 | size_t nbmem, count = 0; | |
2948 | struct lttng_ht_iter iter; | |
2949 | struct ust_app *app; | |
c617c0c6 | 2950 | struct lttng_event_field *tmp_event; |
f37d259d MD |
2951 | |
2952 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
2953 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
2954 | if (tmp_event == NULL) { | |
f37d259d MD |
2955 | PERROR("zmalloc ust app event fields"); |
2956 | ret = -ENOMEM; | |
2957 | goto error; | |
2958 | } | |
2959 | ||
2960 | rcu_read_lock(); | |
2961 | ||
2962 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
2963 | struct lttng_ust_field_iter uiter; | |
2964 | ||
840cb59c | 2965 | health_code_update(); |
86acf0da | 2966 | |
f37d259d MD |
2967 | if (!app->compatible) { |
2968 | /* | |
2969 | * TODO: In time, we should notice the caller of this error by | |
2970 | * telling him that this is a version error. | |
2971 | */ | |
2972 | continue; | |
2973 | } | |
2974 | handle = ustctl_tracepoint_field_list(app->sock); | |
2975 | if (handle < 0) { | |
ffe60014 DG |
2976 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
2977 | ERR("UST app list field getting handle failed for app pid %d", | |
2978 | app->pid); | |
2979 | } | |
f37d259d MD |
2980 | continue; |
2981 | } | |
2982 | ||
2983 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 2984 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
2985 | /* Handle ustctl error. */ |
2986 | if (ret < 0) { | |
2987 | free(tmp_event); | |
2988 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
2989 | ERR("UST app tp list field failed for app %d with ret %d", | |
2990 | app->sock, ret); | |
2991 | } else { | |
2992 | DBG3("UST app tp list field failed. Application is dead"); | |
2993 | } | |
2994 | goto rcu_error; | |
2995 | } | |
2996 | ||
840cb59c | 2997 | health_code_update(); |
f37d259d | 2998 | if (count >= nbmem) { |
d7b3776f | 2999 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3000 | void *ptr; |
3001 | ||
f37d259d MD |
3002 | DBG2("Reallocating event field list from %zu to %zu entries", nbmem, |
3003 | 2 * nbmem); | |
3004 | nbmem *= 2; | |
c617c0c6 MD |
3005 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field)); |
3006 | if (ptr == NULL) { | |
f37d259d | 3007 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3008 | free(tmp_event); |
f37d259d MD |
3009 | ret = -ENOMEM; |
3010 | goto rcu_error; | |
3011 | } | |
c617c0c6 | 3012 | tmp_event = ptr; |
f37d259d | 3013 | } |
f37d259d | 3014 | |
c617c0c6 MD |
3015 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
3016 | tmp_event[count].type = uiter.type; | |
3017 | tmp_event[count].nowrite = uiter.nowrite; | |
f37d259d | 3018 | |
c617c0c6 MD |
3019 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3020 | tmp_event[count].event.loglevel = uiter.loglevel; | |
3021 | tmp_event[count].event.type = LTTNG_UST_TRACEPOINT; | |
3022 | tmp_event[count].event.pid = app->pid; | |
3023 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3024 | count++; |
3025 | } | |
3026 | } | |
3027 | ||
3028 | ret = count; | |
c617c0c6 | 3029 | *fields = tmp_event; |
f37d259d MD |
3030 | |
3031 | DBG2("UST app list event fields done (%zu events)", count); | |
3032 | ||
3033 | rcu_error: | |
3034 | rcu_read_unlock(); | |
3035 | error: | |
840cb59c | 3036 | health_code_update(); |
f37d259d MD |
3037 | return ret; |
3038 | } | |
3039 | ||
5b4a0ec0 DG |
3040 | /* |
3041 | * Free and clean all traceable apps of the global list. | |
3042 | */ | |
3043 | void ust_app_clean_list(void) | |
421cb601 | 3044 | { |
5b4a0ec0 | 3045 | int ret; |
659ed79f | 3046 | struct ust_app *app; |
bec39940 | 3047 | struct lttng_ht_iter iter; |
421cb601 | 3048 | |
5b4a0ec0 | 3049 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3050 | |
5b4a0ec0 | 3051 | rcu_read_lock(); |
421cb601 | 3052 | |
659ed79f | 3053 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3054 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3055 | assert(!ret); |
659ed79f | 3056 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3057 | } |
3058 | ||
852d0037 | 3059 | /* Cleanup socket hash table */ |
659ed79f DG |
3060 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3061 | sock_n.node) { | |
852d0037 | 3062 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3063 | assert(!ret); |
3064 | } | |
852d0037 | 3065 | |
d88aee68 DG |
3066 | /* Cleanup notify socket hash table */ |
3067 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3068 | notify_sock_n.node) { | |
3069 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3070 | assert(!ret); | |
3071 | } | |
3072 | ||
bec39940 | 3073 | /* Destroy is done only when the ht is empty */ |
852d0037 DG |
3074 | lttng_ht_destroy(ust_app_ht); |
3075 | lttng_ht_destroy(ust_app_ht_by_sock); | |
d88aee68 | 3076 | lttng_ht_destroy(ust_app_ht_by_notify_sock); |
421cb601 | 3077 | |
5b4a0ec0 DG |
3078 | rcu_read_unlock(); |
3079 | } | |
3080 | ||
3081 | /* | |
3082 | * Init UST app hash table. | |
3083 | */ | |
3084 | void ust_app_ht_alloc(void) | |
3085 | { | |
bec39940 | 3086 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3087 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3088 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3089 | } |
3090 | ||
78f0bacd DG |
3091 | /* |
3092 | * For a specific UST session, disable the channel for all registered apps. | |
3093 | */ | |
35a9059d | 3094 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3095 | struct ltt_ust_channel *uchan) |
3096 | { | |
3097 | int ret = 0; | |
bec39940 DG |
3098 | struct lttng_ht_iter iter; |
3099 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3100 | struct ust_app *app; |
3101 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3102 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3103 | |
3104 | if (usess == NULL || uchan == NULL) { | |
3105 | ERR("Disabling UST global channel with NULL values"); | |
3106 | ret = -1; | |
3107 | goto error; | |
3108 | } | |
3109 | ||
a991f516 MD |
3110 | DBG2("UST app disabling channel %s from global domain for session id %d", |
3111 | uchan->name, usess->id); | |
78f0bacd DG |
3112 | |
3113 | rcu_read_lock(); | |
3114 | ||
3115 | /* For every registered applications */ | |
852d0037 | 3116 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3117 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3118 | if (!app->compatible) { |
3119 | /* | |
3120 | * TODO: In time, we should notice the caller of this error by | |
3121 | * telling him that this is a version error. | |
3122 | */ | |
3123 | continue; | |
3124 | } | |
78f0bacd DG |
3125 | ua_sess = lookup_session_by_app(usess, app); |
3126 | if (ua_sess == NULL) { | |
3127 | continue; | |
3128 | } | |
3129 | ||
8535a6d9 | 3130 | /* Get channel */ |
bec39940 DG |
3131 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3132 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3133 | /* If the session if found for the app, the channel must be there */ |
3134 | assert(ua_chan_node); | |
3135 | ||
3136 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3137 | /* The channel must not be already disabled */ | |
3138 | assert(ua_chan->enabled == 1); | |
3139 | ||
3140 | /* Disable channel onto application */ | |
3141 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3142 | if (ret < 0) { |
3143 | /* XXX: We might want to report this error at some point... */ | |
3144 | continue; | |
3145 | } | |
3146 | } | |
3147 | ||
3148 | rcu_read_unlock(); | |
3149 | ||
3150 | error: | |
3151 | return ret; | |
3152 | } | |
3153 | ||
3154 | /* | |
3155 | * For a specific UST session, enable the channel for all registered apps. | |
3156 | */ | |
35a9059d | 3157 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3158 | struct ltt_ust_channel *uchan) |
3159 | { | |
3160 | int ret = 0; | |
bec39940 | 3161 | struct lttng_ht_iter iter; |
78f0bacd DG |
3162 | struct ust_app *app; |
3163 | struct ust_app_session *ua_sess; | |
3164 | ||
3165 | if (usess == NULL || uchan == NULL) { | |
3166 | ERR("Adding UST global channel to NULL values"); | |
3167 | ret = -1; | |
3168 | goto error; | |
3169 | } | |
3170 | ||
a991f516 MD |
3171 | DBG2("UST app enabling channel %s to global domain for session id %d", |
3172 | uchan->name, usess->id); | |
78f0bacd DG |
3173 | |
3174 | rcu_read_lock(); | |
3175 | ||
3176 | /* For every registered applications */ | |
852d0037 | 3177 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3178 | if (!app->compatible) { |
3179 | /* | |
3180 | * TODO: In time, we should notice the caller of this error by | |
3181 | * telling him that this is a version error. | |
3182 | */ | |
3183 | continue; | |
3184 | } | |
78f0bacd DG |
3185 | ua_sess = lookup_session_by_app(usess, app); |
3186 | if (ua_sess == NULL) { | |
3187 | continue; | |
3188 | } | |
3189 | ||
3190 | /* Enable channel onto application */ | |
3191 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3192 | if (ret < 0) { | |
3193 | /* XXX: We might want to report this error at some point... */ | |
3194 | continue; | |
3195 | } | |
3196 | } | |
3197 | ||
3198 | rcu_read_unlock(); | |
3199 | ||
3200 | error: | |
3201 | return ret; | |
3202 | } | |
3203 | ||
b0a40d28 DG |
3204 | /* |
3205 | * Disable an event in a channel and for a specific session. | |
3206 | */ | |
35a9059d DG |
3207 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3208 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3209 | { |
3210 | int ret = 0; | |
bec39940 DG |
3211 | struct lttng_ht_iter iter, uiter; |
3212 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3213 | struct ust_app *app; |
3214 | struct ust_app_session *ua_sess; | |
3215 | struct ust_app_channel *ua_chan; | |
3216 | struct ust_app_event *ua_event; | |
3217 | ||
3218 | DBG("UST app disabling event %s for all apps in channel " | |
a991f516 | 3219 | "%s for session id %d", uevent->attr.name, uchan->name, usess->id); |
b0a40d28 DG |
3220 | |
3221 | rcu_read_lock(); | |
3222 | ||
3223 | /* For all registered applications */ | |
852d0037 | 3224 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3225 | if (!app->compatible) { |
3226 | /* | |
3227 | * TODO: In time, we should notice the caller of this error by | |
3228 | * telling him that this is a version error. | |
3229 | */ | |
3230 | continue; | |
3231 | } | |
b0a40d28 DG |
3232 | ua_sess = lookup_session_by_app(usess, app); |
3233 | if (ua_sess == NULL) { | |
3234 | /* Next app */ | |
3235 | continue; | |
3236 | } | |
3237 | ||
3238 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3239 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3240 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3241 | if (ua_chan_node == NULL) { |
a991f516 | 3242 | DBG2("Channel %s not found in session id %d for app pid %d." |
852d0037 | 3243 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3244 | continue; |
3245 | } | |
3246 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3247 | ||
bec39940 DG |
3248 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3249 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3250 | if (ua_event_node == NULL) { |
3251 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3252 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3253 | continue; |
3254 | } | |
3255 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3256 | ||
7f79d3a1 | 3257 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3258 | if (ret < 0) { |
3259 | /* XXX: Report error someday... */ | |
3260 | continue; | |
3261 | } | |
3262 | } | |
3263 | ||
3264 | rcu_read_unlock(); | |
3265 | ||
3266 | return ret; | |
3267 | } | |
3268 | ||
9730260e | 3269 | /* |
edb67388 | 3270 | * For a specific UST session and UST channel, the event for all |
9730260e DG |
3271 | * registered apps. |
3272 | */ | |
35a9059d | 3273 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
9730260e DG |
3274 | struct ltt_ust_channel *uchan) |
3275 | { | |
3276 | int ret = 0; | |
bec39940 DG |
3277 | struct lttng_ht_iter iter, uiter; |
3278 | struct lttng_ht_node_str *ua_chan_node; | |
9730260e DG |
3279 | struct ust_app *app; |
3280 | struct ust_app_session *ua_sess; | |
3281 | struct ust_app_channel *ua_chan; | |
3282 | struct ust_app_event *ua_event; | |
3283 | ||
3284 | DBG("UST app disabling all event for all apps in channel " | |
a991f516 | 3285 | "%s for session id %d", uchan->name, usess->id); |
9730260e DG |
3286 | |
3287 | rcu_read_lock(); | |
3288 | ||
3289 | /* For all registered applications */ | |
852d0037 | 3290 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3291 | if (!app->compatible) { |
3292 | /* | |
3293 | * TODO: In time, we should notice the caller of this error by | |
3294 | * telling him that this is a version error. | |
3295 | */ | |
3296 | continue; | |
3297 | } | |
9730260e | 3298 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3299 | if (!ua_sess) { |
3300 | /* The application has problem or is probably dead. */ | |
3301 | continue; | |
3302 | } | |
9730260e DG |
3303 | |
3304 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3305 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3306 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3307 | /* If the channel is not found, there is a code flow error */ |
3308 | assert(ua_chan_node); | |
3309 | ||
9730260e DG |
3310 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3311 | ||
3312 | /* Disable each events of channel */ | |
bec39940 DG |
3313 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3314 | node.node) { | |
7f79d3a1 | 3315 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
9730260e DG |
3316 | if (ret < 0) { |
3317 | /* XXX: Report error someday... */ | |
3318 | continue; | |
3319 | } | |
3320 | } | |
3321 | } | |
3322 | ||
3323 | rcu_read_unlock(); | |
3324 | ||
3325 | return ret; | |
3326 | } | |
3327 | ||
421cb601 | 3328 | /* |
5b4a0ec0 | 3329 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3330 | */ |
35a9059d | 3331 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3332 | struct ltt_ust_channel *uchan) |
3333 | { | |
3d8ca23b | 3334 | int ret = 0, created; |
bec39940 | 3335 | struct lttng_ht_iter iter; |
48842b30 | 3336 | struct ust_app *app; |
3d8ca23b | 3337 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3338 | |
fc34caaa DG |
3339 | /* Very wrong code flow */ |
3340 | assert(usess); | |
3341 | assert(uchan); | |
421cb601 | 3342 | |
7972aab2 | 3343 | DBG2("UST app adding channel %s to UST domain for session id %d", |
a991f516 | 3344 | uchan->name, usess->id); |
48842b30 DG |
3345 | |
3346 | rcu_read_lock(); | |
421cb601 | 3347 | |
5b4a0ec0 | 3348 | /* For every registered applications */ |
852d0037 | 3349 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3350 | if (!app->compatible) { |
3351 | /* | |
3352 | * TODO: In time, we should notice the caller of this error by | |
3353 | * telling him that this is a version error. | |
3354 | */ | |
3355 | continue; | |
3356 | } | |
edb67388 DG |
3357 | /* |
3358 | * Create session on the tracer side and add it to app session HT. Note | |
3359 | * that if session exist, it will simply return a pointer to the ust | |
3360 | * app session. | |
3361 | */ | |
3d8ca23b DG |
3362 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3363 | if (ret < 0) { | |
3364 | switch (ret) { | |
3365 | case -ENOTCONN: | |
3366 | /* | |
3367 | * The application's socket is not valid. Either a bad socket | |
3368 | * or a timeout on it. We can't inform the caller that for a | |
3369 | * specific app, the session failed so lets continue here. | |
3370 | */ | |
3371 | continue; | |
3372 | case -ENOMEM: | |
3373 | default: | |
3374 | goto error_rcu_unlock; | |
3375 | } | |
48842b30 | 3376 | } |
3d8ca23b | 3377 | assert(ua_sess); |
48842b30 | 3378 | |
d0b96690 | 3379 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3380 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3381 | sizeof(uchan->name))) { | |
3382 | struct ustctl_consumer_channel_attr attr; | |
3383 | copy_channel_attr_to_ustctl(&attr, &uchan->attr); | |
3384 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
3385 | &attr); | |
3386 | } else { | |
3387 | /* Create channel onto application. We don't need the chan ref. */ | |
3388 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3389 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3390 | } | |
d0b96690 | 3391 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3392 | if (ret < 0) { |
3393 | if (ret == -ENOMEM) { | |
3394 | /* No more memory is a fatal error. Stop right now. */ | |
3395 | goto error_rcu_unlock; | |
3396 | } | |
3397 | /* Cleanup the created session if it's the case. */ | |
3398 | if (created) { | |
d0b96690 | 3399 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3400 | } |
48842b30 | 3401 | } |
48842b30 | 3402 | } |
5b4a0ec0 | 3403 | |
95e047ff | 3404 | error_rcu_unlock: |
48842b30 | 3405 | rcu_read_unlock(); |
3c14c33f | 3406 | return ret; |
48842b30 DG |
3407 | } |
3408 | ||
5b4a0ec0 | 3409 | /* |
edb67388 | 3410 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3411 | */ |
35a9059d | 3412 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3413 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3414 | { | |
3415 | int ret = 0; | |
bec39940 | 3416 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3417 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3418 | struct ust_app *app; |
3419 | struct ust_app_session *ua_sess; | |
3420 | struct ust_app_channel *ua_chan; | |
3421 | struct ust_app_event *ua_event; | |
48842b30 | 3422 | |
a991f516 MD |
3423 | DBG("UST app enabling event %s for all apps for session id %d", |
3424 | uevent->attr.name, usess->id); | |
48842b30 | 3425 | |
edb67388 DG |
3426 | /* |
3427 | * NOTE: At this point, this function is called only if the session and | |
3428 | * channel passed are already created for all apps. and enabled on the | |
3429 | * tracer also. | |
3430 | */ | |
3431 | ||
48842b30 | 3432 | rcu_read_lock(); |
421cb601 DG |
3433 | |
3434 | /* For all registered applications */ | |
852d0037 | 3435 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3436 | if (!app->compatible) { |
3437 | /* | |
3438 | * TODO: In time, we should notice the caller of this error by | |
3439 | * telling him that this is a version error. | |
3440 | */ | |
3441 | continue; | |
3442 | } | |
edb67388 | 3443 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3444 | if (!ua_sess) { |
3445 | /* The application has problem or is probably dead. */ | |
3446 | continue; | |
3447 | } | |
ba767faf | 3448 | |
d0b96690 DG |
3449 | pthread_mutex_lock(&ua_sess->lock); |
3450 | ||
edb67388 | 3451 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3452 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3453 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3454 | /* If the channel is not found, there is a code flow error */ |
3455 | assert(ua_chan_node); | |
3456 | ||
3457 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3458 | ||
18eace3b DG |
3459 | /* Get event node */ |
3460 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
3461 | uevent->filter, uevent->attr.loglevel); | |
3462 | if (ua_event == NULL) { | |
7f79d3a1 | 3463 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3464 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3465 | goto next_app; |
35a9059d | 3466 | } |
35a9059d DG |
3467 | |
3468 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3469 | if (ret < 0) { | |
d0b96690 | 3470 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3471 | goto error; |
48842b30 | 3472 | } |
d0b96690 DG |
3473 | next_app: |
3474 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3475 | } |
3476 | ||
7f79d3a1 | 3477 | error: |
edb67388 | 3478 | rcu_read_unlock(); |
edb67388 DG |
3479 | return ret; |
3480 | } | |
3481 | ||
3482 | /* | |
3483 | * For a specific existing UST session and UST channel, creates the event for | |
3484 | * all registered apps. | |
3485 | */ | |
35a9059d | 3486 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3487 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3488 | { | |
3489 | int ret = 0; | |
bec39940 DG |
3490 | struct lttng_ht_iter iter, uiter; |
3491 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3492 | struct ust_app *app; |
3493 | struct ust_app_session *ua_sess; | |
3494 | struct ust_app_channel *ua_chan; | |
3495 | ||
a991f516 MD |
3496 | DBG("UST app creating event %s for all apps for session id %d", |
3497 | uevent->attr.name, usess->id); | |
edb67388 | 3498 | |
edb67388 DG |
3499 | rcu_read_lock(); |
3500 | ||
3501 | /* For all registered applications */ | |
852d0037 | 3502 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3503 | if (!app->compatible) { |
3504 | /* | |
3505 | * TODO: In time, we should notice the caller of this error by | |
3506 | * telling him that this is a version error. | |
3507 | */ | |
3508 | continue; | |
3509 | } | |
edb67388 | 3510 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3511 | if (!ua_sess) { |
3512 | /* The application has problem or is probably dead. */ | |
3513 | continue; | |
3514 | } | |
48842b30 | 3515 | |
d0b96690 | 3516 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3517 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3518 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3519 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3520 | /* If the channel is not found, there is a code flow error */ |
3521 | assert(ua_chan_node); | |
3522 | ||
48842b30 DG |
3523 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3524 | ||
edb67388 | 3525 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3526 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3527 | if (ret < 0) { |
49c336c1 | 3528 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3529 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3530 | break; | |
3531 | } | |
3532 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3533 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3534 | continue; |
48842b30 | 3535 | } |
48842b30 | 3536 | } |
5b4a0ec0 | 3537 | |
48842b30 DG |
3538 | rcu_read_unlock(); |
3539 | ||
3540 | return ret; | |
3541 | } | |
3542 | ||
5b4a0ec0 DG |
3543 | /* |
3544 | * Start tracing for a specific UST session and app. | |
3545 | */ | |
421cb601 | 3546 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3547 | { |
3548 | int ret = 0; | |
48842b30 | 3549 | struct ust_app_session *ua_sess; |
48842b30 | 3550 | |
852d0037 | 3551 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3552 | |
509cbaf8 MD |
3553 | rcu_read_lock(); |
3554 | ||
e0c7ec2b DG |
3555 | if (!app->compatible) { |
3556 | goto end; | |
3557 | } | |
3558 | ||
421cb601 DG |
3559 | ua_sess = lookup_session_by_app(usess, app); |
3560 | if (ua_sess == NULL) { | |
d42f20df DG |
3561 | /* The session is in teardown process. Ignore and continue. */ |
3562 | goto end; | |
421cb601 | 3563 | } |
48842b30 | 3564 | |
d0b96690 DG |
3565 | pthread_mutex_lock(&ua_sess->lock); |
3566 | ||
aea829b3 DG |
3567 | /* Upon restart, we skip the setup, already done */ |
3568 | if (ua_sess->started) { | |
8be98f9a | 3569 | goto skip_setup; |
aea829b3 | 3570 | } |
8be98f9a | 3571 | |
a4b92340 DG |
3572 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3573 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3574 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3575 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3576 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3577 | if (ret < 0) { |
3578 | if (ret != -EEXIST) { | |
3579 | ERR("Trace directory creation error"); | |
d0b96690 | 3580 | goto error_unlock; |
421cb601 | 3581 | } |
173af62f | 3582 | } |
7753dea8 | 3583 | } |
aea829b3 | 3584 | |
d65d2de8 DG |
3585 | /* |
3586 | * Create the metadata for the application. This returns gracefully if a | |
3587 | * metadata was already set for the session. | |
3588 | */ | |
3589 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, NULL); | |
421cb601 | 3590 | if (ret < 0) { |
d0b96690 | 3591 | goto error_unlock; |
421cb601 | 3592 | } |
48842b30 | 3593 | |
840cb59c | 3594 | health_code_update(); |
86acf0da | 3595 | |
8be98f9a | 3596 | skip_setup: |
421cb601 | 3597 | /* This start the UST tracing */ |
852d0037 | 3598 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3599 | if (ret < 0) { |
ffe60014 DG |
3600 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3601 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3602 | app->pid, ret); | |
3603 | } else { | |
3604 | DBG("UST app start session failed. Application is dead."); | |
3605 | } | |
d0b96690 | 3606 | goto error_unlock; |
421cb601 | 3607 | } |
5b4a0ec0 | 3608 | |
55c3953d DG |
3609 | /* Indicate that the session has been started once */ |
3610 | ua_sess->started = 1; | |
3611 | ||
d0b96690 DG |
3612 | pthread_mutex_unlock(&ua_sess->lock); |
3613 | ||
840cb59c | 3614 | health_code_update(); |
86acf0da | 3615 | |
421cb601 | 3616 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3617 | ret = ustctl_wait_quiescent(app->sock); |
3618 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3619 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3620 | app->pid, ret); | |
3621 | } | |
48842b30 | 3622 | |
e0c7ec2b DG |
3623 | end: |
3624 | rcu_read_unlock(); | |
840cb59c | 3625 | health_code_update(); |
421cb601 | 3626 | return 0; |
48842b30 | 3627 | |
d0b96690 DG |
3628 | error_unlock: |
3629 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3630 | rcu_read_unlock(); |
840cb59c | 3631 | health_code_update(); |
421cb601 DG |
3632 | return -1; |
3633 | } | |
48842b30 | 3634 | |
8be98f9a MD |
3635 | /* |
3636 | * Stop tracing for a specific UST session and app. | |
3637 | */ | |
3638 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
3639 | { | |
3640 | int ret = 0; | |
bec39940 | 3641 | struct lttng_ht_iter iter; |
8be98f9a | 3642 | struct ust_app_session *ua_sess; |
6d3686da | 3643 | struct ust_app_channel *ua_chan; |
7972aab2 | 3644 | struct ust_registry_session *registry; |
8be98f9a | 3645 | |
852d0037 | 3646 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3647 | |
3648 | rcu_read_lock(); | |
3649 | ||
e0c7ec2b | 3650 | if (!app->compatible) { |
d88aee68 | 3651 | goto end_no_session; |
e0c7ec2b DG |
3652 | } |
3653 | ||
8be98f9a MD |
3654 | ua_sess = lookup_session_by_app(usess, app); |
3655 | if (ua_sess == NULL) { | |
d88aee68 | 3656 | goto end_no_session; |
8be98f9a MD |
3657 | } |
3658 | ||
d88aee68 DG |
3659 | pthread_mutex_lock(&ua_sess->lock); |
3660 | ||
9bc07046 DG |
3661 | /* |
3662 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3663 | * that was never started. It's possible since we can have a fail start |
3664 | * from either the application manager thread or the command thread. Simply | |
3665 | * indicate that this is a stop error. | |
9bc07046 | 3666 | */ |
f9dfc3d9 | 3667 | if (!ua_sess->started) { |
c45536e1 DG |
3668 | goto error_rcu_unlock; |
3669 | } | |
7db205b5 | 3670 | |
840cb59c | 3671 | health_code_update(); |
86acf0da | 3672 | |
9d6c7d3f | 3673 | /* This inhibits UST tracing */ |
852d0037 | 3674 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3675 | if (ret < 0) { |
ffe60014 DG |
3676 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3677 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3678 | app->pid, ret); | |
3679 | } else { | |
3680 | DBG("UST app stop session failed. Application is dead."); | |
3681 | } | |
9d6c7d3f DG |
3682 | goto error_rcu_unlock; |
3683 | } | |
3684 | ||
840cb59c | 3685 | health_code_update(); |
86acf0da | 3686 | |
9d6c7d3f | 3687 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3688 | ret = ustctl_wait_quiescent(app->sock); |
3689 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3690 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3691 | app->pid, ret); | |
3692 | } | |
9d6c7d3f | 3693 | |
840cb59c | 3694 | health_code_update(); |
86acf0da | 3695 | |
9d6c7d3f | 3696 | /* Flushing buffers */ |
bec39940 DG |
3697 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
3698 | node.node) { | |
840cb59c | 3699 | health_code_update(); |
ffe60014 | 3700 | assert(ua_chan->is_sent); |
852d0037 | 3701 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 3702 | if (ret < 0) { |
ffe60014 DG |
3703 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3704 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
3705 | app->pid, ua_chan->name, ret); | |
3706 | } else { | |
3707 | DBG3("UST app failed to flush %s. Application is dead.", | |
3708 | ua_chan->name); | |
3709 | /* No need to continue. */ | |
d88aee68 | 3710 | break; |
ffe60014 | 3711 | } |
6d3686da DG |
3712 | /* Continuing flushing all buffers */ |
3713 | continue; | |
8be98f9a MD |
3714 | } |
3715 | } | |
8be98f9a | 3716 | |
840cb59c | 3717 | health_code_update(); |
86acf0da | 3718 | |
7972aab2 DG |
3719 | registry = get_session_registry(ua_sess); |
3720 | assert(registry); | |
3721 | /* Push metadata for application before freeing the application. */ | |
3722 | (void) push_metadata(registry, ua_sess->consumer); | |
90d97d10 | 3723 | |
d88aee68 DG |
3724 | pthread_mutex_unlock(&ua_sess->lock); |
3725 | end_no_session: | |
7db205b5 | 3726 | rcu_read_unlock(); |
840cb59c | 3727 | health_code_update(); |
8be98f9a MD |
3728 | return 0; |
3729 | ||
3730 | error_rcu_unlock: | |
d88aee68 | 3731 | pthread_mutex_unlock(&ua_sess->lock); |
8be98f9a | 3732 | rcu_read_unlock(); |
840cb59c | 3733 | health_code_update(); |
8be98f9a MD |
3734 | return -1; |
3735 | } | |
3736 | ||
84cd17c6 MD |
3737 | /* |
3738 | * Destroy a specific UST session in apps. | |
3739 | */ | |
3353de95 | 3740 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 3741 | { |
ffe60014 | 3742 | int ret; |
84cd17c6 | 3743 | struct ust_app_session *ua_sess; |
bec39940 DG |
3744 | struct lttng_ht_iter iter; |
3745 | struct lttng_ht_node_ulong *node; | |
84cd17c6 | 3746 | |
852d0037 | 3747 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
3748 | |
3749 | rcu_read_lock(); | |
3750 | ||
e0c7ec2b DG |
3751 | if (!app->compatible) { |
3752 | goto end; | |
3753 | } | |
3754 | ||
84cd17c6 | 3755 | __lookup_session_by_app(usess, app, &iter); |
bec39940 | 3756 | node = lttng_ht_iter_get_node_ulong(&iter); |
84cd17c6 | 3757 | if (node == NULL) { |
d42f20df DG |
3758 | /* Session is being or is deleted. */ |
3759 | goto end; | |
84cd17c6 MD |
3760 | } |
3761 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 3762 | |
840cb59c | 3763 | health_code_update(); |
d0b96690 | 3764 | destroy_app_session(app, ua_sess); |
84cd17c6 | 3765 | |
840cb59c | 3766 | health_code_update(); |
7db205b5 | 3767 | |
84cd17c6 | 3768 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3769 | ret = ustctl_wait_quiescent(app->sock); |
3770 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3771 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3772 | app->pid, ret); | |
3773 | } | |
e0c7ec2b DG |
3774 | end: |
3775 | rcu_read_unlock(); | |
840cb59c | 3776 | health_code_update(); |
84cd17c6 | 3777 | return 0; |
84cd17c6 MD |
3778 | } |
3779 | ||
5b4a0ec0 DG |
3780 | /* |
3781 | * Start tracing for the UST session. | |
3782 | */ | |
421cb601 DG |
3783 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
3784 | { | |
3785 | int ret = 0; | |
bec39940 | 3786 | struct lttng_ht_iter iter; |
421cb601 | 3787 | struct ust_app *app; |
48842b30 | 3788 | |
421cb601 DG |
3789 | DBG("Starting all UST traces"); |
3790 | ||
3791 | rcu_read_lock(); | |
421cb601 | 3792 | |
852d0037 | 3793 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 3794 | ret = ust_app_start_trace(usess, app); |
48842b30 | 3795 | if (ret < 0) { |
5b4a0ec0 DG |
3796 | /* Continue to next apps even on error */ |
3797 | continue; | |
48842b30 | 3798 | } |
48842b30 | 3799 | } |
5b4a0ec0 | 3800 | |
48842b30 DG |
3801 | rcu_read_unlock(); |
3802 | ||
3803 | return 0; | |
3804 | } | |
487cf67c | 3805 | |
8be98f9a MD |
3806 | /* |
3807 | * Start tracing for the UST session. | |
3808 | */ | |
3809 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
3810 | { | |
3811 | int ret = 0; | |
bec39940 | 3812 | struct lttng_ht_iter iter; |
8be98f9a MD |
3813 | struct ust_app *app; |
3814 | ||
3815 | DBG("Stopping all UST traces"); | |
3816 | ||
3817 | rcu_read_lock(); | |
3818 | ||
7972aab2 DG |
3819 | /* Flush all per UID buffers associated to that session. */ |
3820 | if (usess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
3821 | struct buffer_reg_uid *reg; | |
3822 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
3823 | struct buffer_reg_channel *reg_chan; | |
3824 | struct consumer_socket *socket; | |
3825 | ||
3826 | /* Get consumer socket to use to push the metadata.*/ | |
3827 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
3828 | usess->consumer); | |
3829 | if (!socket) { | |
3830 | /* Ignore request if no consumer is found for the session. */ | |
3831 | continue; | |
3832 | } | |
3833 | ||
3834 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
3835 | reg_chan, node.node) { | |
3836 | /* | |
3837 | * The following call will print error values so the return | |
3838 | * code is of little importance because whatever happens, we | |
3839 | * have to try them all. | |
3840 | */ | |
3841 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
3842 | } | |
3843 | } | |
3844 | } | |
3845 | ||
852d0037 | 3846 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
8be98f9a MD |
3847 | ret = ust_app_stop_trace(usess, app); |
3848 | if (ret < 0) { | |
3849 | /* Continue to next apps even on error */ | |
3850 | continue; | |
3851 | } | |
3852 | } | |
3853 | ||
3854 | rcu_read_unlock(); | |
3855 | ||
3856 | return 0; | |
3857 | } | |
3858 | ||
84cd17c6 MD |
3859 | /* |
3860 | * Destroy app UST session. | |
3861 | */ | |
3862 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
3863 | { | |
3864 | int ret = 0; | |
bec39940 | 3865 | struct lttng_ht_iter iter; |
84cd17c6 MD |
3866 | struct ust_app *app; |
3867 | ||
3868 | DBG("Destroy all UST traces"); | |
3869 | ||
3870 | rcu_read_lock(); | |
3871 | ||
852d0037 | 3872 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 3873 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
3874 | if (ret < 0) { |
3875 | /* Continue to next apps even on error */ | |
3876 | continue; | |
3877 | } | |
3878 | } | |
3879 | ||
3880 | rcu_read_unlock(); | |
3881 | ||
3882 | return 0; | |
3883 | } | |
3884 | ||
5b4a0ec0 DG |
3885 | /* |
3886 | * Add channels/events from UST global domain to registered apps at sock. | |
3887 | */ | |
487cf67c DG |
3888 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
3889 | { | |
55c54cce | 3890 | int ret = 0; |
727d5404 | 3891 | struct lttng_ht_iter iter, uiter, iter_ctx; |
487cf67c | 3892 | struct ust_app *app; |
3d8ca23b | 3893 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
3894 | struct ust_app_channel *ua_chan; |
3895 | struct ust_app_event *ua_event; | |
727d5404 | 3896 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 3897 | |
95e047ff | 3898 | assert(usess); |
ffe60014 | 3899 | assert(sock >= 0); |
1f3580c7 | 3900 | |
a991f516 MD |
3901 | DBG2("UST app global update for app sock %d for session id %d", sock, |
3902 | usess->id); | |
487cf67c | 3903 | |
284d8f55 DG |
3904 | rcu_read_lock(); |
3905 | ||
487cf67c DG |
3906 | app = find_app_by_sock(sock); |
3907 | if (app == NULL) { | |
d88aee68 DG |
3908 | /* |
3909 | * Application can be unregistered before so this is possible hence | |
3910 | * simply stopping the update. | |
3911 | */ | |
3912 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
3913 | goto error; |
3914 | } | |
3915 | ||
e0c7ec2b DG |
3916 | if (!app->compatible) { |
3917 | goto error; | |
3918 | } | |
3919 | ||
3d8ca23b DG |
3920 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
3921 | if (ret < 0) { | |
3922 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
3923 | goto error; |
3924 | } | |
3d8ca23b | 3925 | assert(ua_sess); |
487cf67c | 3926 | |
d0b96690 DG |
3927 | pthread_mutex_lock(&ua_sess->lock); |
3928 | ||
284d8f55 | 3929 | /* |
d0b96690 | 3930 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
3931 | * app session above made a shadow copy of the UST global domain from the |
3932 | * ltt ust session. | |
3933 | */ | |
bec39940 DG |
3934 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
3935 | node.node) { | |
d65d2de8 DG |
3936 | /* |
3937 | * For a metadata channel, handle it differently. | |
3938 | */ | |
3939 | if (!strncmp(ua_chan->name, DEFAULT_METADATA_NAME, | |
3940 | sizeof(ua_chan->name))) { | |
3941 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
3942 | &ua_chan->attr); | |
c7a339aa DG |
3943 | if (ret < 0) { |
3944 | goto error_unlock; | |
3945 | } | |
d65d2de8 DG |
3946 | /* Remove it from the hash table and continue!. */ |
3947 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
3948 | assert(!ret); | |
3949 | delete_ust_app_channel(-1, ua_chan, app); | |
3950 | continue; | |
3951 | } else { | |
3952 | ret = do_create_channel(app, usess, ua_sess, ua_chan); | |
c7a339aa DG |
3953 | if (ret < 0) { |
3954 | /* | |
3955 | * Stop everything. On error, the application failed, no more | |
3956 | * file descriptor are available or ENOMEM so stopping here is | |
3957 | * the only thing we can do for now. | |
3958 | */ | |
3959 | goto error_unlock; | |
3960 | } | |
487cf67c DG |
3961 | } |
3962 | ||
727d5404 DG |
3963 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx, |
3964 | node.node) { | |
3965 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
3966 | if (ret < 0) { | |
d0b96690 | 3967 | goto error_unlock; |
727d5404 DG |
3968 | } |
3969 | } | |
3970 | ||
3971 | ||
284d8f55 | 3972 | /* For each events */ |
bec39940 DG |
3973 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3974 | node.node) { | |
284d8f55 DG |
3975 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
3976 | if (ret < 0) { | |
d0b96690 | 3977 | goto error_unlock; |
487cf67c | 3978 | } |
36dc12cc | 3979 | } |
487cf67c DG |
3980 | } |
3981 | ||
d0b96690 DG |
3982 | pthread_mutex_unlock(&ua_sess->lock); |
3983 | ||
36dc12cc | 3984 | if (usess->start_trace) { |
421cb601 | 3985 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 3986 | if (ret < 0) { |
36dc12cc DG |
3987 | goto error; |
3988 | } | |
3989 | ||
852d0037 | 3990 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
3991 | } |
3992 | ||
ffe60014 DG |
3993 | /* Everything went well at this point. */ |
3994 | rcu_read_unlock(); | |
3995 | return; | |
3996 | ||
d0b96690 DG |
3997 | error_unlock: |
3998 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 3999 | error: |
ffe60014 | 4000 | if (ua_sess) { |
d0b96690 | 4001 | destroy_app_session(app, ua_sess); |
ffe60014 | 4002 | } |
487cf67c DG |
4003 | rcu_read_unlock(); |
4004 | return; | |
4005 | } | |
55cc08a6 DG |
4006 | |
4007 | /* | |
4008 | * Add context to a specific channel for global UST domain. | |
4009 | */ | |
4010 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4011 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4012 | { | |
4013 | int ret = 0; | |
bec39940 DG |
4014 | struct lttng_ht_node_str *ua_chan_node; |
4015 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4016 | struct ust_app_channel *ua_chan = NULL; |
4017 | struct ust_app_session *ua_sess; | |
4018 | struct ust_app *app; | |
4019 | ||
4020 | rcu_read_lock(); | |
4021 | ||
852d0037 | 4022 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4023 | if (!app->compatible) { |
4024 | /* | |
4025 | * TODO: In time, we should notice the caller of this error by | |
4026 | * telling him that this is a version error. | |
4027 | */ | |
4028 | continue; | |
4029 | } | |
55cc08a6 DG |
4030 | ua_sess = lookup_session_by_app(usess, app); |
4031 | if (ua_sess == NULL) { | |
4032 | continue; | |
4033 | } | |
4034 | ||
d0b96690 | 4035 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4036 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4037 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4038 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4039 | if (ua_chan_node == NULL) { |
d0b96690 | 4040 | goto next_app; |
55cc08a6 DG |
4041 | } |
4042 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4043 | node); | |
55cc08a6 DG |
4044 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4045 | if (ret < 0) { | |
d0b96690 | 4046 | goto next_app; |
55cc08a6 | 4047 | } |
d0b96690 DG |
4048 | next_app: |
4049 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4050 | } |
4051 | ||
55cc08a6 DG |
4052 | rcu_read_unlock(); |
4053 | return ret; | |
4054 | } | |
4055 | ||
76d45b40 DG |
4056 | /* |
4057 | * Enable event for a channel from a UST session for a specific PID. | |
4058 | */ | |
4059 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4060 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4061 | { | |
4062 | int ret = 0; | |
bec39940 | 4063 | struct lttng_ht_iter iter; |
18eace3b | 4064 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4065 | struct ust_app *app; |
4066 | struct ust_app_session *ua_sess; | |
4067 | struct ust_app_channel *ua_chan; | |
4068 | struct ust_app_event *ua_event; | |
4069 | ||
4070 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4071 | ||
4072 | rcu_read_lock(); | |
4073 | ||
4074 | app = ust_app_find_by_pid(pid); | |
4075 | if (app == NULL) { | |
4076 | ERR("UST app enable event per PID %d not found", pid); | |
4077 | ret = -1; | |
d0b96690 | 4078 | goto end; |
76d45b40 DG |
4079 | } |
4080 | ||
e0c7ec2b DG |
4081 | if (!app->compatible) { |
4082 | ret = 0; | |
d0b96690 | 4083 | goto end; |
e0c7ec2b DG |
4084 | } |
4085 | ||
76d45b40 | 4086 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4087 | if (!ua_sess) { |
4088 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4089 | ret = 0; |
4090 | goto end; | |
c4a1715b | 4091 | } |
76d45b40 | 4092 | |
d0b96690 | 4093 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4094 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4095 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4096 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4097 | /* If the channel is not found, there is a code flow error */ |
4098 | assert(ua_chan_node); | |
4099 | ||
4100 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4101 | ||
18eace3b DG |
4102 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4103 | uevent->filter, uevent->attr.loglevel); | |
4104 | if (ua_event == NULL) { | |
76d45b40 DG |
4105 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4106 | if (ret < 0) { | |
d0b96690 | 4107 | goto end_unlock; |
76d45b40 DG |
4108 | } |
4109 | } else { | |
76d45b40 DG |
4110 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4111 | if (ret < 0) { | |
d0b96690 | 4112 | goto end_unlock; |
76d45b40 DG |
4113 | } |
4114 | } | |
4115 | ||
d0b96690 DG |
4116 | end_unlock: |
4117 | pthread_mutex_unlock(&ua_sess->lock); | |
4118 | end: | |
76d45b40 DG |
4119 | rcu_read_unlock(); |
4120 | return ret; | |
4121 | } | |
7f79d3a1 DG |
4122 | |
4123 | /* | |
4124 | * Disable event for a channel from a UST session for a specific PID. | |
4125 | */ | |
4126 | int ust_app_disable_event_pid(struct ltt_ust_session *usess, | |
4127 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4128 | { | |
4129 | int ret = 0; | |
bec39940 DG |
4130 | struct lttng_ht_iter iter; |
4131 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
7f79d3a1 DG |
4132 | struct ust_app *app; |
4133 | struct ust_app_session *ua_sess; | |
4134 | struct ust_app_channel *ua_chan; | |
4135 | struct ust_app_event *ua_event; | |
4136 | ||
4137 | DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); | |
4138 | ||
4139 | rcu_read_lock(); | |
4140 | ||
4141 | app = ust_app_find_by_pid(pid); | |
4142 | if (app == NULL) { | |
4143 | ERR("UST app disable event per PID %d not found", pid); | |
4144 | ret = -1; | |
4145 | goto error; | |
4146 | } | |
4147 | ||
e0c7ec2b DG |
4148 | if (!app->compatible) { |
4149 | ret = 0; | |
4150 | goto error; | |
4151 | } | |
4152 | ||
7f79d3a1 | 4153 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4154 | if (!ua_sess) { |
4155 | /* The application has problem or is probably dead. */ | |
4156 | goto error; | |
4157 | } | |
7f79d3a1 DG |
4158 | |
4159 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4160 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4161 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4162 | if (ua_chan_node == NULL) { |
4163 | /* Channel does not exist, skip disabling */ | |
4164 | goto error; | |
4165 | } | |
4166 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4167 | ||
bec39940 DG |
4168 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); |
4169 | ua_event_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4170 | if (ua_event_node == NULL) { |
4171 | /* Event does not exist, skip disabling */ | |
4172 | goto error; | |
4173 | } | |
4174 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
4175 | ||
4176 | ret = disable_ust_app_event(ua_sess, ua_event, app); | |
4177 | if (ret < 0) { | |
4178 | goto error; | |
4179 | } | |
4180 | ||
4181 | error: | |
4182 | rcu_read_unlock(); | |
4183 | return ret; | |
4184 | } | |
e0c7ec2b | 4185 | |
4466912f DG |
4186 | /* |
4187 | * Calibrate registered applications. | |
4188 | */ | |
4189 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4190 | { | |
4191 | int ret = 0; | |
4192 | struct lttng_ht_iter iter; | |
4193 | struct ust_app *app; | |
4194 | ||
4195 | rcu_read_lock(); | |
4196 | ||
852d0037 | 4197 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4198 | if (!app->compatible) { |
4199 | /* | |
4200 | * TODO: In time, we should notice the caller of this error by | |
4201 | * telling him that this is a version error. | |
4202 | */ | |
4203 | continue; | |
4204 | } | |
4205 | ||
840cb59c | 4206 | health_code_update(); |
86acf0da | 4207 | |
852d0037 | 4208 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4209 | if (ret < 0) { |
4210 | switch (ret) { | |
4211 | case -ENOSYS: | |
4212 | /* Means that it's not implemented on the tracer side. */ | |
4213 | ret = 0; | |
4214 | break; | |
4215 | default: | |
4466912f | 4216 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4217 | app->pid, ret); |
4466912f DG |
4218 | break; |
4219 | } | |
4220 | } | |
4221 | } | |
4222 | ||
4223 | DBG("UST app global domain calibration finished"); | |
4224 | ||
4225 | rcu_read_unlock(); | |
4226 | ||
840cb59c | 4227 | health_code_update(); |
86acf0da | 4228 | |
4466912f DG |
4229 | return ret; |
4230 | } | |
d0b96690 DG |
4231 | |
4232 | /* | |
4233 | * Receive registration and populate the given msg structure. | |
4234 | * | |
4235 | * On success return 0 else a negative value returned by the ustctl call. | |
4236 | */ | |
4237 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4238 | { | |
4239 | int ret; | |
4240 | uint32_t pid, ppid, uid, gid; | |
4241 | ||
4242 | assert(msg); | |
4243 | ||
4244 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4245 | &pid, &ppid, &uid, &gid, | |
4246 | &msg->bits_per_long, | |
4247 | &msg->uint8_t_alignment, | |
4248 | &msg->uint16_t_alignment, | |
4249 | &msg->uint32_t_alignment, | |
4250 | &msg->uint64_t_alignment, | |
4251 | &msg->long_alignment, | |
4252 | &msg->byte_order, | |
4253 | msg->name); | |
4254 | if (ret < 0) { | |
4255 | switch (-ret) { | |
4256 | case EPIPE: | |
4257 | case ECONNRESET: | |
4258 | case LTTNG_UST_ERR_EXITING: | |
4259 | DBG3("UST app recv reg message failed. Application died"); | |
4260 | break; | |
4261 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4262 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4263 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4264 | LTTNG_UST_ABI_MINOR_VERSION); | |
4265 | break; | |
4266 | default: | |
4267 | ERR("UST app recv reg message failed with ret %d", ret); | |
4268 | break; | |
4269 | } | |
4270 | goto error; | |
4271 | } | |
4272 | msg->pid = (pid_t) pid; | |
4273 | msg->ppid = (pid_t) ppid; | |
4274 | msg->uid = (uid_t) uid; | |
4275 | msg->gid = (gid_t) gid; | |
4276 | ||
4277 | error: | |
4278 | return ret; | |
4279 | } | |
4280 | ||
d88aee68 DG |
4281 | /* |
4282 | * Return a ust app channel object using the application object and the channel | |
4283 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4284 | * lock MUST be acquired before calling this function. | |
4285 | */ | |
d0b96690 DG |
4286 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4287 | int objd) | |
4288 | { | |
4289 | struct lttng_ht_node_ulong *node; | |
4290 | struct lttng_ht_iter iter; | |
4291 | struct ust_app_channel *ua_chan = NULL; | |
4292 | ||
4293 | assert(app); | |
4294 | ||
4295 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4296 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4297 | if (node == NULL) { | |
4298 | DBG2("UST app channel find by objd %d not found", objd); | |
4299 | goto error; | |
4300 | } | |
4301 | ||
4302 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4303 | ||
4304 | error: | |
4305 | return ua_chan; | |
4306 | } | |
4307 | ||
d88aee68 DG |
4308 | /* |
4309 | * Reply to a register channel notification from an application on the notify | |
4310 | * socket. The channel metadata is also created. | |
4311 | * | |
4312 | * The session UST registry lock is acquired in this function. | |
4313 | * | |
4314 | * On success 0 is returned else a negative value. | |
4315 | */ | |
d0b96690 DG |
4316 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4317 | size_t nr_fields, struct ustctl_field *fields) | |
4318 | { | |
4319 | int ret, ret_code = 0; | |
4320 | uint32_t chan_id, reg_count; | |
7972aab2 | 4321 | uint64_t chan_reg_key; |
d0b96690 DG |
4322 | enum ustctl_channel_header type; |
4323 | struct ust_app *app; | |
4324 | struct ust_app_channel *ua_chan; | |
4325 | struct ust_app_session *ua_sess; | |
7972aab2 | 4326 | struct ust_registry_session *registry; |
45893984 | 4327 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4328 | |
4329 | rcu_read_lock(); | |
4330 | ||
4331 | /* Lookup application. If not found, there is a code flow error. */ | |
4332 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4333 | if (!app) { |
4334 | DBG("Application socket %d is being teardown. Abort event notify", | |
4335 | sock); | |
4336 | ret = 0; | |
4337 | goto error_rcu_unlock; | |
4338 | } | |
d0b96690 DG |
4339 | |
4340 | /* Lookup channel by UST object descriptor. Should always be found. */ | |
4341 | ua_chan = find_channel_by_objd(app, cobjd); | |
4342 | assert(ua_chan); | |
4343 | assert(ua_chan->session); | |
4344 | ua_sess = ua_chan->session; | |
d0b96690 | 4345 | |
7972aab2 DG |
4346 | /* Get right session registry depending on the session buffer type. */ |
4347 | registry = get_session_registry(ua_sess); | |
4348 | assert(registry); | |
45893984 | 4349 | |
7972aab2 DG |
4350 | /* Depending on the buffer type, a different channel key is used. */ |
4351 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4352 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4353 | } else { |
7972aab2 | 4354 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4355 | } |
4356 | ||
7972aab2 DG |
4357 | pthread_mutex_lock(®istry->lock); |
4358 | ||
4359 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4360 | assert(chan_reg); | |
4361 | ||
4362 | if (!chan_reg->register_done) { | |
4363 | reg_count = ust_registry_get_event_count(chan_reg); | |
4364 | if (reg_count < 31) { | |
4365 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4366 | } else { | |
4367 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4368 | } | |
4369 | ||
4370 | chan_reg->nr_ctx_fields = nr_fields; | |
4371 | chan_reg->ctx_fields = fields; | |
4372 | chan_reg->header_type = type; | |
d0b96690 | 4373 | } else { |
7972aab2 DG |
4374 | /* Get current already assigned values. */ |
4375 | type = chan_reg->header_type; | |
d0b96690 | 4376 | } |
7972aab2 DG |
4377 | /* Channel id is set during the object creation. */ |
4378 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4379 | |
4380 | /* Append to metadata */ | |
7972aab2 DG |
4381 | if (!chan_reg->metadata_dumped) { |
4382 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4383 | if (ret_code) { |
4384 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4385 | goto reply; | |
4386 | } | |
4387 | } | |
4388 | ||
4389 | reply: | |
7972aab2 DG |
4390 | DBG3("UST app replying to register channel key %" PRIu64 |
4391 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4392 | ret_code); | |
d0b96690 DG |
4393 | |
4394 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4395 | if (ret < 0) { | |
4396 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4397 | ERR("UST app reply channel failed with ret %d", ret); | |
4398 | } else { | |
4399 | DBG3("UST app reply channel failed. Application died"); | |
4400 | } | |
4401 | goto error; | |
4402 | } | |
4403 | ||
7972aab2 DG |
4404 | /* This channel registry registration is completed. */ |
4405 | chan_reg->register_done = 1; | |
4406 | ||
d0b96690 | 4407 | error: |
7972aab2 | 4408 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4409 | error_rcu_unlock: |
d0b96690 DG |
4410 | rcu_read_unlock(); |
4411 | return ret; | |
4412 | } | |
4413 | ||
d88aee68 DG |
4414 | /* |
4415 | * Add event to the UST channel registry. When the event is added to the | |
4416 | * registry, the metadata is also created. Once done, this replies to the | |
4417 | * application with the appropriate error code. | |
4418 | * | |
4419 | * The session UST registry lock is acquired in the function. | |
4420 | * | |
4421 | * On success 0 is returned else a negative value. | |
4422 | */ | |
d0b96690 DG |
4423 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4424 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4425 | char *model_emf_uri) | |
4426 | { | |
4427 | int ret, ret_code; | |
4428 | uint32_t event_id = 0; | |
7972aab2 | 4429 | uint64_t chan_reg_key; |
d0b96690 DG |
4430 | struct ust_app *app; |
4431 | struct ust_app_channel *ua_chan; | |
4432 | struct ust_app_session *ua_sess; | |
7972aab2 | 4433 | struct ust_registry_session *registry; |
d0b96690 DG |
4434 | |
4435 | rcu_read_lock(); | |
4436 | ||
4437 | /* Lookup application. If not found, there is a code flow error. */ | |
4438 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4439 | if (!app) { |
4440 | DBG("Application socket %d is being teardown. Abort event notify", | |
4441 | sock); | |
4442 | ret = 0; | |
4443 | goto error_rcu_unlock; | |
4444 | } | |
d0b96690 DG |
4445 | |
4446 | /* Lookup channel by UST object descriptor. Should always be found. */ | |
4447 | ua_chan = find_channel_by_objd(app, cobjd); | |
4448 | assert(ua_chan); | |
4449 | assert(ua_chan->session); | |
4450 | ua_sess = ua_chan->session; | |
4451 | ||
7972aab2 DG |
4452 | registry = get_session_registry(ua_sess); |
4453 | assert(registry); | |
4454 | ||
4455 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4456 | chan_reg_key = ua_chan->tracing_channel_id; | |
4457 | } else { | |
4458 | chan_reg_key = ua_chan->key; | |
4459 | } | |
4460 | ||
4461 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4462 | |
7972aab2 | 4463 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4464 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
7972aab2 | 4465 | model_emf_uri, ua_sess->buffer_type, &event_id); |
d0b96690 DG |
4466 | |
4467 | /* | |
4468 | * The return value is returned to ustctl so in case of an error, the | |
4469 | * application can be notified. In case of an error, it's important not to | |
4470 | * return a negative error or else the application will get closed. | |
4471 | */ | |
4472 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4473 | if (ret < 0) { | |
4474 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4475 | ERR("UST app reply event failed with ret %d", ret); | |
4476 | } else { | |
4477 | DBG3("UST app reply event failed. Application died"); | |
4478 | } | |
4479 | /* | |
4480 | * No need to wipe the create event since the application socket will | |
4481 | * get close on error hence cleaning up everything by itself. | |
4482 | */ | |
4483 | goto error; | |
4484 | } | |
4485 | ||
7972aab2 DG |
4486 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4487 | name, event_id); | |
d88aee68 | 4488 | |
d0b96690 | 4489 | error: |
7972aab2 | 4490 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4491 | error_rcu_unlock: |
d0b96690 DG |
4492 | rcu_read_unlock(); |
4493 | return ret; | |
4494 | } | |
4495 | ||
d88aee68 DG |
4496 | /* |
4497 | * Handle application notification through the given notify socket. | |
4498 | * | |
4499 | * Return 0 on success or else a negative value. | |
4500 | */ | |
d0b96690 DG |
4501 | int ust_app_recv_notify(int sock) |
4502 | { | |
4503 | int ret; | |
4504 | enum ustctl_notify_cmd cmd; | |
4505 | ||
4506 | DBG3("UST app receiving notify from sock %d", sock); | |
4507 | ||
4508 | ret = ustctl_recv_notify(sock, &cmd); | |
4509 | if (ret < 0) { | |
4510 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4511 | ERR("UST app recv notify failed with ret %d", ret); | |
4512 | } else { | |
4513 | DBG3("UST app recv notify failed. Application died"); | |
4514 | } | |
4515 | goto error; | |
4516 | } | |
4517 | ||
4518 | switch (cmd) { | |
4519 | case USTCTL_NOTIFY_CMD_EVENT: | |
4520 | { | |
4521 | int sobjd, cobjd, loglevel; | |
4522 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4523 | size_t nr_fields; | |
4524 | struct ustctl_field *fields; | |
4525 | ||
4526 | DBG2("UST app ustctl register event received"); | |
4527 | ||
4528 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4529 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4530 | if (ret < 0) { | |
4531 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4532 | ERR("UST app recv event failed with ret %d", ret); | |
4533 | } else { | |
4534 | DBG3("UST app recv event failed. Application died"); | |
4535 | } | |
4536 | goto error; | |
4537 | } | |
4538 | ||
4539 | /* Add event to the UST registry coming from the notify socket. */ | |
4540 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, | |
4541 | fields, loglevel, model_emf_uri); | |
4542 | if (ret < 0) { | |
4543 | goto error; | |
4544 | } | |
4545 | ||
4546 | break; | |
4547 | } | |
4548 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4549 | { | |
4550 | int sobjd, cobjd; | |
4551 | size_t nr_fields; | |
4552 | struct ustctl_field *fields; | |
4553 | ||
4554 | DBG2("UST app ustctl register channel received"); | |
4555 | ||
4556 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4557 | &fields); | |
4558 | if (ret < 0) { | |
4559 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4560 | ERR("UST app recv channel failed with ret %d", ret); | |
4561 | } else { | |
4562 | DBG3("UST app recv channel failed. Application died"); | |
4563 | } | |
4564 | goto error; | |
4565 | } | |
4566 | ||
4567 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, | |
4568 | fields); | |
4569 | if (ret < 0) { | |
4570 | goto error; | |
4571 | } | |
4572 | ||
4573 | break; | |
4574 | } | |
4575 | default: | |
4576 | /* Should NEVER happen. */ | |
4577 | assert(0); | |
4578 | } | |
4579 | ||
4580 | error: | |
4581 | return ret; | |
4582 | } | |
d88aee68 DG |
4583 | |
4584 | /* | |
4585 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4586 | * corresponding application. On failure, the call_rcu to close the socket is | |
4587 | * executed. If an application is found, it tries to delete it from the notify | |
4588 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4589 | * | |
4590 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4591 | * call RCU is not done but the rest of the cleanup is. | |
4592 | */ | |
4593 | void ust_app_notify_sock_unregister(int sock) | |
4594 | { | |
4595 | int err_enomem = 0; | |
4596 | struct lttng_ht_iter iter; | |
4597 | struct ust_app *app; | |
4598 | struct ust_app_notify_sock_obj *obj; | |
4599 | ||
4600 | assert(sock >= 0); | |
4601 | ||
4602 | rcu_read_lock(); | |
4603 | ||
4604 | obj = zmalloc(sizeof(*obj)); | |
4605 | if (!obj) { | |
4606 | /* | |
4607 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4608 | * procedure but the call_rcu will not be called. In this case, we | |
4609 | * accept the fd leak rather than possibly creating an unsynchronized | |
4610 | * state between threads. | |
4611 | * | |
4612 | * TODO: The notify object should be created once the notify socket is | |
4613 | * registered and stored independantely from the ust app object. The | |
4614 | * tricky part is to synchronize the teardown of the application and | |
4615 | * this notify object. Let's keep that in mind so we can avoid this | |
4616 | * kind of shenanigans with ENOMEM in the teardown path. | |
4617 | */ | |
4618 | err_enomem = 1; | |
4619 | } else { | |
4620 | obj->fd = sock; | |
4621 | } | |
4622 | ||
4623 | DBG("UST app notify socket unregister %d", sock); | |
4624 | ||
4625 | /* | |
4626 | * Lookup application by notify socket. If this fails, this means that the | |
4627 | * hash table delete has already been done by the application | |
4628 | * unregistration process so we can safely close the notify socket in a | |
4629 | * call RCU. | |
4630 | */ | |
4631 | app = find_app_by_notify_sock(sock); | |
4632 | if (!app) { | |
4633 | goto close_socket; | |
4634 | } | |
4635 | ||
4636 | iter.iter.node = &app->notify_sock_n.node; | |
4637 | ||
4638 | /* | |
4639 | * Whatever happens here either we fail or succeed, in both cases we have | |
4640 | * to close the socket after a grace period to continue to the call RCU | |
4641 | * here. If the deletion is successful, the application is not visible | |
4642 | * anymore by other threads and is it fails it means that it was already | |
4643 | * deleted from the hash table so either way we just have to close the | |
4644 | * socket. | |
4645 | */ | |
4646 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4647 | ||
4648 | close_socket: | |
4649 | rcu_read_unlock(); | |
4650 | ||
4651 | /* | |
4652 | * Close socket after a grace period to avoid for the socket to be reused | |
4653 | * before the application object is freed creating potential race between | |
4654 | * threads trying to add unique in the global hash table. | |
4655 | */ | |
4656 | if (!err_enomem) { | |
4657 | call_rcu(&obj->head, close_notify_sock_rcu); | |
4658 | } | |
4659 | } |