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 | 40 | #include "ust-ctl.h" |
0b2dc8df | 41 | #include "utils.h" |
d80a6244 | 42 | |
d9bf3ca4 MD |
43 | /* Next available channel key. Access under next_channel_key_lock. */ |
44 | static uint64_t _next_channel_key; | |
45 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
46 | ||
47 | /* Next available session ID. Access under next_session_id_lock. */ | |
48 | static uint64_t _next_session_id; | |
49 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
50 | |
51 | /* | |
d9bf3ca4 | 52 | * Return the incremented value of next_channel_key. |
ffe60014 | 53 | */ |
d9bf3ca4 | 54 | static uint64_t get_next_channel_key(void) |
ffe60014 | 55 | { |
d9bf3ca4 MD |
56 | uint64_t ret; |
57 | ||
58 | pthread_mutex_lock(&next_channel_key_lock); | |
59 | ret = ++_next_channel_key; | |
60 | pthread_mutex_unlock(&next_channel_key_lock); | |
61 | return ret; | |
ffe60014 DG |
62 | } |
63 | ||
64 | /* | |
7972aab2 | 65 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 66 | */ |
d9bf3ca4 | 67 | static uint64_t get_next_session_id(void) |
ffe60014 | 68 | { |
d9bf3ca4 MD |
69 | uint64_t ret; |
70 | ||
71 | pthread_mutex_lock(&next_session_id_lock); | |
72 | ret = ++_next_session_id; | |
73 | pthread_mutex_unlock(&next_session_id_lock); | |
74 | return ret; | |
ffe60014 DG |
75 | } |
76 | ||
d65d2de8 DG |
77 | static void copy_channel_attr_to_ustctl( |
78 | struct ustctl_consumer_channel_attr *attr, | |
79 | struct lttng_ust_channel_attr *uattr) | |
80 | { | |
81 | /* Copy event attributes since the layout is different. */ | |
82 | attr->subbuf_size = uattr->subbuf_size; | |
83 | attr->num_subbuf = uattr->num_subbuf; | |
84 | attr->overwrite = uattr->overwrite; | |
85 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
86 | attr->read_timer_interval = uattr->read_timer_interval; | |
87 | attr->output = uattr->output; | |
88 | } | |
89 | ||
025faf73 DG |
90 | /* |
91 | * Match function for the hash table lookup. | |
92 | * | |
93 | * It matches an ust app event based on three attributes which are the event | |
94 | * name, the filter bytecode and the loglevel. | |
95 | */ | |
18eace3b DG |
96 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
97 | { | |
98 | struct ust_app_event *event; | |
99 | const struct ust_app_ht_key *key; | |
100 | ||
101 | assert(node); | |
102 | assert(_key); | |
103 | ||
104 | event = caa_container_of(node, struct ust_app_event, node.node); | |
105 | key = _key; | |
106 | ||
107 | /* Match the 3 elements of the key: name, filter and loglevel. */ | |
108 | ||
109 | /* Event name */ | |
110 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
111 | goto no_match; | |
112 | } | |
113 | ||
114 | /* Event loglevel. */ | |
115 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
116 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
117 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
118 | /* | |
119 | * Match is accepted. This is because on event creation, the | |
120 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
121 | * -1 are accepted for this loglevel type since 0 is the one set by | |
122 | * the API when receiving an enable event. | |
123 | */ | |
124 | } else { | |
125 | goto no_match; | |
126 | } | |
18eace3b DG |
127 | } |
128 | ||
129 | /* One of the filters is NULL, fail. */ | |
130 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
131 | goto no_match; | |
132 | } | |
133 | ||
025faf73 DG |
134 | if (key->filter && event->filter) { |
135 | /* Both filters exists, check length followed by the bytecode. */ | |
136 | if (event->filter->len != key->filter->len || | |
137 | memcmp(event->filter->data, key->filter->data, | |
138 | event->filter->len) != 0) { | |
139 | goto no_match; | |
140 | } | |
18eace3b DG |
141 | } |
142 | ||
025faf73 | 143 | /* Match. */ |
18eace3b DG |
144 | return 1; |
145 | ||
146 | no_match: | |
147 | return 0; | |
18eace3b DG |
148 | } |
149 | ||
025faf73 DG |
150 | /* |
151 | * Unique add of an ust app event in the given ht. This uses the custom | |
152 | * ht_match_ust_app_event match function and the event name as hash. | |
153 | */ | |
d0b96690 | 154 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
155 | struct ust_app_event *event) |
156 | { | |
157 | struct cds_lfht_node *node_ptr; | |
158 | struct ust_app_ht_key key; | |
d0b96690 | 159 | struct lttng_ht *ht; |
18eace3b | 160 | |
d0b96690 DG |
161 | assert(ua_chan); |
162 | assert(ua_chan->events); | |
18eace3b DG |
163 | assert(event); |
164 | ||
d0b96690 | 165 | ht = ua_chan->events; |
18eace3b DG |
166 | key.name = event->attr.name; |
167 | key.filter = event->filter; | |
168 | key.loglevel = event->attr.loglevel; | |
169 | ||
170 | node_ptr = cds_lfht_add_unique(ht->ht, | |
171 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
172 | ht_match_ust_app_event, &key, &event->node.node); | |
173 | assert(node_ptr == &event->node.node); | |
174 | } | |
175 | ||
d88aee68 DG |
176 | /* |
177 | * Close the notify socket from the given RCU head object. This MUST be called | |
178 | * through a call_rcu(). | |
179 | */ | |
180 | static void close_notify_sock_rcu(struct rcu_head *head) | |
181 | { | |
182 | int ret; | |
183 | struct ust_app_notify_sock_obj *obj = | |
184 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
185 | ||
186 | /* Must have a valid fd here. */ | |
187 | assert(obj->fd >= 0); | |
188 | ||
189 | ret = close(obj->fd); | |
190 | if (ret) { | |
191 | ERR("close notify sock %d RCU", obj->fd); | |
192 | } | |
193 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
194 | ||
195 | free(obj); | |
196 | } | |
197 | ||
7972aab2 DG |
198 | /* |
199 | * Return the session registry according to the buffer type of the given | |
200 | * session. | |
201 | * | |
202 | * A registry per UID object MUST exists before calling this function or else | |
203 | * it assert() if not found. RCU read side lock must be acquired. | |
204 | */ | |
205 | static struct ust_registry_session *get_session_registry( | |
206 | struct ust_app_session *ua_sess) | |
207 | { | |
208 | struct ust_registry_session *registry = NULL; | |
209 | ||
210 | assert(ua_sess); | |
211 | ||
212 | switch (ua_sess->buffer_type) { | |
213 | case LTTNG_BUFFER_PER_PID: | |
214 | { | |
215 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
216 | if (!reg_pid) { | |
217 | goto error; | |
218 | } | |
219 | registry = reg_pid->registry->reg.ust; | |
220 | break; | |
221 | } | |
222 | case LTTNG_BUFFER_PER_UID: | |
223 | { | |
224 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
225 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
226 | if (!reg_uid) { | |
227 | goto error; | |
228 | } | |
229 | registry = reg_uid->registry->reg.ust; | |
230 | break; | |
231 | } | |
232 | default: | |
233 | assert(0); | |
234 | }; | |
235 | ||
236 | error: | |
237 | return registry; | |
238 | } | |
239 | ||
55cc08a6 DG |
240 | /* |
241 | * Delete ust context safely. RCU read lock must be held before calling | |
242 | * this function. | |
243 | */ | |
244 | static | |
245 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
246 | { | |
ffe60014 DG |
247 | int ret; |
248 | ||
249 | assert(ua_ctx); | |
250 | ||
55cc08a6 | 251 | if (ua_ctx->obj) { |
ffe60014 | 252 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
253 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
254 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
255 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 256 | } |
55cc08a6 DG |
257 | free(ua_ctx->obj); |
258 | } | |
259 | free(ua_ctx); | |
260 | } | |
261 | ||
d80a6244 DG |
262 | /* |
263 | * Delete ust app event safely. RCU read lock must be held before calling | |
264 | * this function. | |
265 | */ | |
8b366481 DG |
266 | static |
267 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 268 | { |
ffe60014 DG |
269 | int ret; |
270 | ||
271 | assert(ua_event); | |
272 | ||
53a80697 | 273 | free(ua_event->filter); |
d80a6244 | 274 | |
edb67388 | 275 | if (ua_event->obj != NULL) { |
ffe60014 DG |
276 | ret = ustctl_release_object(sock, ua_event->obj); |
277 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
278 | ERR("UST app sock %d release event obj failed with ret %d", | |
279 | sock, ret); | |
280 | } | |
edb67388 DG |
281 | free(ua_event->obj); |
282 | } | |
d80a6244 DG |
283 | free(ua_event); |
284 | } | |
285 | ||
286 | /* | |
7972aab2 DG |
287 | * Release ust data object of the given stream. |
288 | * | |
289 | * Return 0 on success or else a negative value. | |
d80a6244 | 290 | */ |
7972aab2 | 291 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 292 | { |
7972aab2 | 293 | int ret = 0; |
ffe60014 DG |
294 | |
295 | assert(stream); | |
296 | ||
8b366481 | 297 | if (stream->obj) { |
ffe60014 DG |
298 | ret = ustctl_release_object(sock, stream->obj); |
299 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
300 | ERR("UST app sock %d release stream obj failed with ret %d", | |
301 | sock, ret); | |
302 | } | |
4063050c | 303 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
304 | free(stream->obj); |
305 | } | |
7972aab2 DG |
306 | |
307 | return ret; | |
308 | } | |
309 | ||
310 | /* | |
311 | * Delete ust app stream safely. RCU read lock must be held before calling | |
312 | * this function. | |
313 | */ | |
314 | static | |
315 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
316 | { | |
317 | assert(stream); | |
318 | ||
319 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 320 | free(stream); |
d80a6244 DG |
321 | } |
322 | ||
36b588ed MD |
323 | /* |
324 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
325 | * section and outside of call_rcu thread, so we postpone its execution |
326 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
327 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
328 | */ |
329 | static | |
330 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
331 | { | |
332 | struct ust_app_channel *ua_chan = | |
333 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
334 | ||
0b2dc8df MD |
335 | ht_cleanup_push(ua_chan->ctx); |
336 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
337 | free(ua_chan); |
338 | } | |
339 | ||
d80a6244 DG |
340 | /* |
341 | * Delete ust app channel safely. RCU read lock must be held before calling | |
342 | * this function. | |
343 | */ | |
8b366481 | 344 | static |
d0b96690 DG |
345 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
346 | struct ust_app *app) | |
d80a6244 DG |
347 | { |
348 | int ret; | |
bec39940 | 349 | struct lttng_ht_iter iter; |
d80a6244 | 350 | struct ust_app_event *ua_event; |
55cc08a6 | 351 | struct ust_app_ctx *ua_ctx; |
030a66fa | 352 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 353 | struct ust_registry_session *registry; |
d80a6244 | 354 | |
ffe60014 DG |
355 | assert(ua_chan); |
356 | ||
357 | DBG3("UST app deleting channel %s", ua_chan->name); | |
358 | ||
55cc08a6 | 359 | /* Wipe stream */ |
d80a6244 | 360 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 361 | cds_list_del(&stream->list); |
d80a6244 DG |
362 | delete_ust_app_stream(sock, stream); |
363 | } | |
364 | ||
55cc08a6 | 365 | /* Wipe context */ |
bec39940 | 366 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 367 | cds_list_del(&ua_ctx->list); |
bec39940 | 368 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 DG |
369 | assert(!ret); |
370 | delete_ust_app_ctx(sock, ua_ctx); | |
371 | } | |
d80a6244 | 372 | |
55cc08a6 | 373 | /* Wipe events */ |
bec39940 DG |
374 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
375 | node.node) { | |
376 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 377 | assert(!ret); |
d80a6244 DG |
378 | delete_ust_app_event(sock, ua_event); |
379 | } | |
edb67388 | 380 | |
c8335706 MD |
381 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
382 | /* Wipe and free registry from session registry. */ | |
383 | registry = get_session_registry(ua_chan->session); | |
384 | if (registry) { | |
385 | ust_registry_channel_del_free(registry, ua_chan->key); | |
386 | } | |
7972aab2 | 387 | } |
d0b96690 | 388 | |
edb67388 | 389 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
390 | /* Remove channel from application UST object descriptor. */ |
391 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
392 | lttng_ht_del(app->ust_objd, &iter); | |
ffe60014 DG |
393 | ret = ustctl_release_object(sock, ua_chan->obj); |
394 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
395 | ERR("UST app sock %d release channel obj failed with ret %d", | |
396 | sock, ret); | |
397 | } | |
7972aab2 | 398 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
399 | free(ua_chan->obj); |
400 | } | |
36b588ed | 401 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
402 | } |
403 | ||
331744e3 | 404 | /* |
1b532a60 DG |
405 | * Push metadata to consumer socket. |
406 | * | |
407 | * The socket lock MUST be acquired. | |
408 | * The ust app session lock MUST be acquired. | |
331744e3 JD |
409 | * |
410 | * On success, return the len of metadata pushed or else a negative value. | |
411 | */ | |
412 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
413 | struct consumer_socket *socket, int send_zero_data) | |
414 | { | |
415 | int ret; | |
416 | char *metadata_str = NULL; | |
417 | size_t len, offset; | |
418 | ssize_t ret_val; | |
419 | ||
420 | assert(registry); | |
421 | assert(socket); | |
1b532a60 DG |
422 | |
423 | /* | |
424 | * On a push metadata error either the consumer is dead or the metadata | |
425 | * channel has been destroyed because its endpoint might have died (e.g: | |
426 | * relayd). If so, the metadata closed flag is set to 1 so we deny pushing | |
427 | * metadata again which is not valid anymore on the consumer side. | |
428 | * | |
429 | * The ust app session mutex locked allows us to make this check without | |
430 | * the registry lock. | |
431 | */ | |
432 | if (registry->metadata_closed) { | |
433 | return -EPIPE; | |
434 | } | |
331744e3 JD |
435 | |
436 | pthread_mutex_lock(®istry->lock); | |
437 | ||
438 | offset = registry->metadata_len_sent; | |
439 | len = registry->metadata_len - registry->metadata_len_sent; | |
440 | if (len == 0) { | |
441 | DBG3("No metadata to push for metadata key %" PRIu64, | |
442 | registry->metadata_key); | |
443 | ret_val = len; | |
444 | if (send_zero_data) { | |
445 | DBG("No metadata to push"); | |
446 | goto push_data; | |
447 | } | |
448 | goto end; | |
449 | } | |
450 | ||
451 | /* Allocate only what we have to send. */ | |
452 | metadata_str = zmalloc(len); | |
453 | if (!metadata_str) { | |
454 | PERROR("zmalloc ust app metadata string"); | |
455 | ret_val = -ENOMEM; | |
456 | goto error; | |
457 | } | |
458 | /* Copy what we haven't send out. */ | |
459 | memcpy(metadata_str, registry->metadata + offset, len); | |
460 | registry->metadata_len_sent += len; | |
461 | ||
462 | push_data: | |
463 | pthread_mutex_unlock(®istry->lock); | |
464 | ret = consumer_push_metadata(socket, registry->metadata_key, | |
465 | metadata_str, len, offset); | |
466 | if (ret < 0) { | |
9e794c11 DG |
467 | /* |
468 | * There is an acceptable race here between the registry metadata key | |
469 | * assignment and the creation on the consumer. The session daemon can | |
470 | * concurrently push metadata for this registry while being created on | |
471 | * the consumer since the metadata key of the registry is assigned | |
472 | * *before* it is setup to avoid the consumer to ask for metadata that | |
473 | * could possibly be not found in the session daemon. | |
474 | * | |
475 | * The metadata will get pushed either by the session being stopped or | |
476 | * the consumer requesting metadata if that race is triggered. | |
477 | */ | |
478 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
479 | ret = 0; | |
480 | } | |
331744e3 JD |
481 | ret_val = ret; |
482 | goto error_push; | |
483 | } | |
484 | ||
485 | free(metadata_str); | |
486 | return len; | |
487 | ||
488 | end: | |
489 | error: | |
490 | pthread_mutex_unlock(®istry->lock); | |
491 | error_push: | |
492 | free(metadata_str); | |
493 | return ret_val; | |
494 | } | |
495 | ||
d88aee68 DG |
496 | /* |
497 | * For a given application and session, push metadata to consumer. The session | |
498 | * lock MUST be acquired here before calling this. | |
331744e3 JD |
499 | * Either sock or consumer is required : if sock is NULL, the default |
500 | * socket to send the metadata is retrieved from consumer, if sock | |
501 | * is not NULL we use it to send the metadata. | |
d88aee68 DG |
502 | * |
503 | * Return 0 on success else a negative error. | |
504 | */ | |
7972aab2 DG |
505 | static int push_metadata(struct ust_registry_session *registry, |
506 | struct consumer_output *consumer) | |
d88aee68 | 507 | { |
331744e3 JD |
508 | int ret_val; |
509 | ssize_t ret; | |
d88aee68 DG |
510 | struct consumer_socket *socket; |
511 | ||
7972aab2 DG |
512 | assert(registry); |
513 | assert(consumer); | |
514 | ||
515 | rcu_read_lock(); | |
d88aee68 | 516 | |
7972aab2 DG |
517 | /* |
518 | * Means that no metadata was assigned to the session. This can happens if | |
519 | * no start has been done previously. | |
520 | */ | |
521 | if (!registry->metadata_key) { | |
331744e3 | 522 | ret_val = 0; |
1b532a60 | 523 | goto end_rcu_unlock; |
d88aee68 DG |
524 | } |
525 | ||
d88aee68 | 526 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
527 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
528 | consumer); | |
d88aee68 | 529 | if (!socket) { |
331744e3 | 530 | ret_val = -1; |
d88aee68 DG |
531 | goto error_rcu_unlock; |
532 | } | |
533 | ||
534 | /* | |
535 | * TODO: Currently, we hold the socket lock around sampling of the next | |
536 | * metadata segment to ensure we send metadata over the consumer socket in | |
537 | * the correct order. This makes the registry lock nest inside the socket | |
538 | * lock. | |
539 | * | |
540 | * Please note that this is a temporary measure: we should move this lock | |
541 | * back into ust_consumer_push_metadata() when the consumer gets the | |
542 | * ability to reorder the metadata it receives. | |
543 | */ | |
544 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
545 | ret = ust_app_push_metadata(registry, socket, 0); |
546 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 547 | if (ret < 0) { |
331744e3 | 548 | ret_val = ret; |
d88aee68 DG |
549 | goto error_rcu_unlock; |
550 | } | |
551 | ||
d88aee68 | 552 | rcu_read_unlock(); |
d88aee68 DG |
553 | return 0; |
554 | ||
d88aee68 | 555 | error_rcu_unlock: |
1b532a60 DG |
556 | /* |
557 | * On error, flag the registry that the metadata is closed. We were unable | |
558 | * to push anything and this means that either the consumer is not | |
559 | * responding or the metadata cache has been destroyed on the consumer. | |
560 | */ | |
561 | registry->metadata_closed = 1; | |
562 | end_rcu_unlock: | |
d88aee68 | 563 | rcu_read_unlock(); |
331744e3 | 564 | return ret_val; |
d88aee68 DG |
565 | } |
566 | ||
567 | /* | |
568 | * Send to the consumer a close metadata command for the given session. Once | |
569 | * done, the metadata channel is deleted and the session metadata pointer is | |
570 | * nullified. The session lock MUST be acquired here unless the application is | |
571 | * in the destroy path. | |
572 | * | |
573 | * Return 0 on success else a negative value. | |
574 | */ | |
7972aab2 DG |
575 | static int close_metadata(struct ust_registry_session *registry, |
576 | struct consumer_output *consumer) | |
d88aee68 DG |
577 | { |
578 | int ret; | |
579 | struct consumer_socket *socket; | |
580 | ||
7972aab2 DG |
581 | assert(registry); |
582 | assert(consumer); | |
d88aee68 | 583 | |
7972aab2 DG |
584 | rcu_read_lock(); |
585 | ||
586 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 | 587 | ret = 0; |
1b532a60 | 588 | goto end; |
d88aee68 DG |
589 | } |
590 | ||
d88aee68 | 591 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
592 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
593 | consumer); | |
d88aee68 DG |
594 | if (!socket) { |
595 | ret = -1; | |
7972aab2 | 596 | goto error; |
d88aee68 DG |
597 | } |
598 | ||
7972aab2 | 599 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 600 | if (ret < 0) { |
7972aab2 | 601 | goto error; |
d88aee68 DG |
602 | } |
603 | ||
d88aee68 | 604 | error: |
1b532a60 DG |
605 | /* |
606 | * Metadata closed. Even on error this means that the consumer is not | |
607 | * responding or not found so either way a second close should NOT be emit | |
608 | * for this registry. | |
609 | */ | |
610 | registry->metadata_closed = 1; | |
611 | end: | |
7972aab2 | 612 | rcu_read_unlock(); |
d88aee68 DG |
613 | return ret; |
614 | } | |
615 | ||
36b588ed MD |
616 | /* |
617 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
618 | * section and outside of call_rcu thread, so we postpone its execution |
619 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
620 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
621 | */ |
622 | static | |
623 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
624 | { | |
625 | struct ust_app_session *ua_sess = | |
626 | caa_container_of(head, struct ust_app_session, rcu_head); | |
627 | ||
0b2dc8df | 628 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
629 | free(ua_sess); |
630 | } | |
631 | ||
d80a6244 DG |
632 | /* |
633 | * Delete ust app session safely. RCU read lock must be held before calling | |
634 | * this function. | |
635 | */ | |
8b366481 | 636 | static |
d0b96690 DG |
637 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
638 | struct ust_app *app) | |
d80a6244 DG |
639 | { |
640 | int ret; | |
bec39940 | 641 | struct lttng_ht_iter iter; |
d80a6244 | 642 | struct ust_app_channel *ua_chan; |
7972aab2 | 643 | struct ust_registry_session *registry; |
d80a6244 | 644 | |
d88aee68 DG |
645 | assert(ua_sess); |
646 | ||
1b532a60 DG |
647 | pthread_mutex_lock(&ua_sess->lock); |
648 | ||
7972aab2 | 649 | registry = get_session_registry(ua_sess); |
1b532a60 | 650 | if (registry && !registry->metadata_closed) { |
d88aee68 | 651 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 652 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 653 | |
7972aab2 DG |
654 | /* |
655 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
656 | * metadata only on destroy trace session in this case. Also, the |
657 | * previous push metadata could have flag the metadata registry to | |
658 | * close so don't send a close command if closed. | |
7972aab2 | 659 | */ |
1b532a60 DG |
660 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
661 | !registry->metadata_closed) { | |
7972aab2 DG |
662 | /* And ask to close it for this session registry. */ |
663 | (void) close_metadata(registry, ua_sess->consumer); | |
664 | } | |
d80a6244 DG |
665 | } |
666 | ||
bec39940 DG |
667 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
668 | node.node) { | |
669 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 670 | assert(!ret); |
d0b96690 | 671 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 672 | } |
d80a6244 | 673 | |
7972aab2 DG |
674 | /* In case of per PID, the registry is kept in the session. */ |
675 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
676 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
677 | if (reg_pid) { | |
678 | buffer_reg_pid_remove(reg_pid); | |
679 | buffer_reg_pid_destroy(reg_pid); | |
680 | } | |
681 | } | |
d0b96690 | 682 | |
aee6bafd | 683 | if (ua_sess->handle != -1) { |
ffe60014 DG |
684 | ret = ustctl_release_handle(sock, ua_sess->handle); |
685 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
686 | ERR("UST app sock %d release session handle failed with ret %d", | |
687 | sock, ret); | |
688 | } | |
aee6bafd | 689 | } |
1b532a60 DG |
690 | pthread_mutex_unlock(&ua_sess->lock); |
691 | ||
36b588ed | 692 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 693 | } |
91d76f53 DG |
694 | |
695 | /* | |
284d8f55 DG |
696 | * Delete a traceable application structure from the global list. Never call |
697 | * this function outside of a call_rcu call. | |
36b588ed MD |
698 | * |
699 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 700 | */ |
8b366481 DG |
701 | static |
702 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 703 | { |
8b366481 | 704 | int ret, sock; |
d42f20df | 705 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 706 | |
d80a6244 | 707 | /* Delete ust app sessions info */ |
852d0037 DG |
708 | sock = app->sock; |
709 | app->sock = -1; | |
d80a6244 | 710 | |
8b366481 | 711 | /* Wipe sessions */ |
d42f20df DG |
712 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
713 | teardown_node) { | |
714 | /* Free every object in the session and the session. */ | |
36b588ed | 715 | rcu_read_lock(); |
d0b96690 | 716 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 717 | rcu_read_unlock(); |
d80a6244 | 718 | } |
36b588ed | 719 | |
0b2dc8df MD |
720 | ht_cleanup_push(app->sessions); |
721 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 722 | |
6414a713 | 723 | /* |
852d0037 DG |
724 | * Wait until we have deleted the application from the sock hash table |
725 | * before closing this socket, otherwise an application could re-use the | |
726 | * socket ID and race with the teardown, using the same hash table entry. | |
727 | * | |
728 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
729 | * all RCU readers that could run concurrently with unregister app, | |
730 | * therefore we _need_ to only close that socket after a grace period. So | |
731 | * it should stay in this RCU callback. | |
732 | * | |
733 | * This close() is a very important step of the synchronization model so | |
734 | * every modification to this function must be carefully reviewed. | |
6414a713 | 735 | */ |
799e2c4f MD |
736 | ret = close(sock); |
737 | if (ret) { | |
738 | PERROR("close"); | |
739 | } | |
4063050c | 740 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 741 | |
852d0037 | 742 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 743 | free(app); |
099e26bd DG |
744 | } |
745 | ||
746 | /* | |
f6a9efaa | 747 | * URCU intermediate call to delete an UST app. |
099e26bd | 748 | */ |
8b366481 DG |
749 | static |
750 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 751 | { |
bec39940 DG |
752 | struct lttng_ht_node_ulong *node = |
753 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 754 | struct ust_app *app = |
852d0037 | 755 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 756 | |
852d0037 | 757 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 758 | delete_ust_app(app); |
099e26bd DG |
759 | } |
760 | ||
ffe60014 DG |
761 | /* |
762 | * Delete the session from the application ht and delete the data structure by | |
763 | * freeing every object inside and releasing them. | |
764 | */ | |
d0b96690 | 765 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
766 | struct ust_app_session *ua_sess) |
767 | { | |
768 | int ret; | |
769 | struct lttng_ht_iter iter; | |
770 | ||
771 | assert(app); | |
772 | assert(ua_sess); | |
773 | ||
774 | iter.iter.node = &ua_sess->node.node; | |
775 | ret = lttng_ht_del(app->sessions, &iter); | |
776 | if (ret) { | |
777 | /* Already scheduled for teardown. */ | |
778 | goto end; | |
779 | } | |
780 | ||
781 | /* Once deleted, free the data structure. */ | |
d0b96690 | 782 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
783 | |
784 | end: | |
785 | return; | |
786 | } | |
787 | ||
8b366481 DG |
788 | /* |
789 | * Alloc new UST app session. | |
790 | */ | |
791 | static | |
d0b96690 | 792 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
793 | { |
794 | struct ust_app_session *ua_sess; | |
795 | ||
796 | /* Init most of the default value by allocating and zeroing */ | |
797 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
798 | if (ua_sess == NULL) { | |
799 | PERROR("malloc"); | |
ffe60014 | 800 | goto error_free; |
8b366481 DG |
801 | } |
802 | ||
803 | ua_sess->handle = -1; | |
bec39940 | 804 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
d0b96690 | 805 | pthread_mutex_init(&ua_sess->lock, NULL); |
ffe60014 | 806 | |
8b366481 DG |
807 | return ua_sess; |
808 | ||
ffe60014 | 809 | error_free: |
8b366481 DG |
810 | return NULL; |
811 | } | |
812 | ||
813 | /* | |
814 | * Alloc new UST app channel. | |
815 | */ | |
816 | static | |
817 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 818 | struct ust_app_session *ua_sess, |
ffe60014 | 819 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
820 | { |
821 | struct ust_app_channel *ua_chan; | |
822 | ||
823 | /* Init most of the default value by allocating and zeroing */ | |
824 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
825 | if (ua_chan == NULL) { | |
826 | PERROR("malloc"); | |
827 | goto error; | |
828 | } | |
829 | ||
830 | /* Setup channel name */ | |
831 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
832 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
833 | ||
834 | ua_chan->enabled = 1; | |
835 | ua_chan->handle = -1; | |
45893984 | 836 | ua_chan->session = ua_sess; |
ffe60014 | 837 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
838 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
839 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
840 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
841 | |
842 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 843 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
844 | |
845 | /* Copy attributes */ | |
846 | if (attr) { | |
ffe60014 | 847 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
848 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
849 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
850 | ua_chan->attr.overwrite = attr->overwrite; | |
851 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
852 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
853 | ua_chan->attr.output = attr->output; | |
8b366481 | 854 | } |
ffe60014 DG |
855 | /* By default, the channel is a per cpu channel. */ |
856 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
857 | |
858 | DBG3("UST app channel %s allocated", ua_chan->name); | |
859 | ||
860 | return ua_chan; | |
861 | ||
862 | error: | |
863 | return NULL; | |
864 | } | |
865 | ||
37f1c236 DG |
866 | /* |
867 | * Allocate and initialize a UST app stream. | |
868 | * | |
869 | * Return newly allocated stream pointer or NULL on error. | |
870 | */ | |
ffe60014 | 871 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
872 | { |
873 | struct ust_app_stream *stream = NULL; | |
874 | ||
875 | stream = zmalloc(sizeof(*stream)); | |
876 | if (stream == NULL) { | |
877 | PERROR("zmalloc ust app stream"); | |
878 | goto error; | |
879 | } | |
880 | ||
881 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
882 | stream->handle = -1; | |
883 | ||
884 | error: | |
885 | return stream; | |
886 | } | |
887 | ||
8b366481 DG |
888 | /* |
889 | * Alloc new UST app event. | |
890 | */ | |
891 | static | |
892 | struct ust_app_event *alloc_ust_app_event(char *name, | |
893 | struct lttng_ust_event *attr) | |
894 | { | |
895 | struct ust_app_event *ua_event; | |
896 | ||
897 | /* Init most of the default value by allocating and zeroing */ | |
898 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
899 | if (ua_event == NULL) { | |
900 | PERROR("malloc"); | |
901 | goto error; | |
902 | } | |
903 | ||
904 | ua_event->enabled = 1; | |
905 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
906 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 907 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
908 | |
909 | /* Copy attributes */ | |
910 | if (attr) { | |
911 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
912 | } | |
913 | ||
914 | DBG3("UST app event %s allocated", ua_event->name); | |
915 | ||
916 | return ua_event; | |
917 | ||
918 | error: | |
919 | return NULL; | |
920 | } | |
921 | ||
922 | /* | |
923 | * Alloc new UST app context. | |
924 | */ | |
925 | static | |
926 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
927 | { | |
928 | struct ust_app_ctx *ua_ctx; | |
929 | ||
930 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
931 | if (ua_ctx == NULL) { | |
932 | goto error; | |
933 | } | |
934 | ||
31746f93 DG |
935 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
936 | ||
8b366481 DG |
937 | if (uctx) { |
938 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
939 | } | |
940 | ||
941 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
942 | ||
943 | error: | |
944 | return ua_ctx; | |
945 | } | |
946 | ||
025faf73 DG |
947 | /* |
948 | * Allocate a filter and copy the given original filter. | |
949 | * | |
950 | * Return allocated filter or NULL on error. | |
951 | */ | |
952 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
953 | struct lttng_ust_filter_bytecode *orig_f) | |
954 | { | |
955 | struct lttng_ust_filter_bytecode *filter = NULL; | |
956 | ||
957 | /* Copy filter bytecode */ | |
958 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
959 | if (!filter) { | |
960 | PERROR("zmalloc alloc ust app filter"); | |
961 | goto error; | |
962 | } | |
963 | ||
964 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
965 | ||
966 | error: | |
967 | return filter; | |
968 | } | |
969 | ||
099e26bd | 970 | /* |
421cb601 DG |
971 | * Find an ust_app using the sock and return it. RCU read side lock must be |
972 | * held before calling this helper function. | |
099e26bd | 973 | */ |
8b366481 DG |
974 | static |
975 | struct ust_app *find_app_by_sock(int sock) | |
099e26bd | 976 | { |
bec39940 | 977 | struct lttng_ht_node_ulong *node; |
bec39940 | 978 | struct lttng_ht_iter iter; |
f6a9efaa | 979 | |
852d0037 | 980 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 981 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
982 | if (node == NULL) { |
983 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
984 | goto error; |
985 | } | |
852d0037 DG |
986 | |
987 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
988 | |
989 | error: | |
990 | return NULL; | |
099e26bd DG |
991 | } |
992 | ||
d0b96690 DG |
993 | /* |
994 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
995 | * be held before calling this helper function. | |
996 | */ | |
997 | static struct ust_app *find_app_by_notify_sock(int sock) | |
998 | { | |
999 | struct lttng_ht_node_ulong *node; | |
1000 | struct lttng_ht_iter iter; | |
1001 | ||
1002 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1003 | &iter); | |
1004 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1005 | if (node == NULL) { | |
1006 | DBG2("UST app find by notify sock %d not found", sock); | |
1007 | goto error; | |
1008 | } | |
1009 | ||
1010 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1011 | ||
1012 | error: | |
1013 | return NULL; | |
1014 | } | |
1015 | ||
025faf73 DG |
1016 | /* |
1017 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1018 | * event loglevel. | |
1019 | * | |
1020 | * Return an ust_app_event object or NULL on error. | |
1021 | */ | |
18eace3b DG |
1022 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
1023 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel) | |
1024 | { | |
1025 | struct lttng_ht_iter iter; | |
1026 | struct lttng_ht_node_str *node; | |
1027 | struct ust_app_event *event = NULL; | |
1028 | struct ust_app_ht_key key; | |
18eace3b DG |
1029 | |
1030 | assert(name); | |
1031 | assert(ht); | |
1032 | ||
1033 | /* Setup key for event lookup. */ | |
1034 | key.name = name; | |
1035 | key.filter = filter; | |
1036 | key.loglevel = loglevel; | |
1037 | ||
025faf73 DG |
1038 | /* Lookup using the event name as hash and a custom match fct. */ |
1039 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1040 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1041 | node = lttng_ht_iter_get_node_str(&iter); |
1042 | if (node == NULL) { | |
1043 | goto end; | |
1044 | } | |
1045 | ||
1046 | event = caa_container_of(node, struct ust_app_event, node); | |
1047 | ||
1048 | end: | |
18eace3b DG |
1049 | return event; |
1050 | } | |
1051 | ||
55cc08a6 DG |
1052 | /* |
1053 | * Create the channel context on the tracer. | |
d0b96690 DG |
1054 | * |
1055 | * Called with UST app session lock held. | |
55cc08a6 DG |
1056 | */ |
1057 | static | |
1058 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1059 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1060 | { | |
1061 | int ret; | |
1062 | ||
840cb59c | 1063 | health_code_update(); |
86acf0da | 1064 | |
852d0037 | 1065 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1066 | ua_chan->obj, &ua_ctx->obj); |
1067 | if (ret < 0) { | |
ffe60014 DG |
1068 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1069 | ERR("UST app create channel context failed for app (pid: %d) " | |
1070 | "with ret %d", app->pid, ret); | |
1071 | } else { | |
3757b385 DG |
1072 | /* |
1073 | * This is normal behavior, an application can die during the | |
1074 | * creation process. Don't report an error so the execution can | |
1075 | * continue normally. | |
1076 | */ | |
1077 | ret = 0; | |
ffe60014 DG |
1078 | DBG3("UST app disable event failed. Application is dead."); |
1079 | } | |
55cc08a6 DG |
1080 | goto error; |
1081 | } | |
1082 | ||
1083 | ua_ctx->handle = ua_ctx->obj->handle; | |
1084 | ||
d0b96690 DG |
1085 | DBG2("UST app context handle %d created successfully for channel %s", |
1086 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1087 | |
1088 | error: | |
840cb59c | 1089 | health_code_update(); |
55cc08a6 DG |
1090 | return ret; |
1091 | } | |
1092 | ||
53a80697 MD |
1093 | /* |
1094 | * Set the filter on the tracer. | |
1095 | */ | |
1096 | static | |
1097 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1098 | struct ust_app *app) | |
1099 | { | |
1100 | int ret; | |
1101 | ||
840cb59c | 1102 | health_code_update(); |
86acf0da | 1103 | |
53a80697 | 1104 | if (!ua_event->filter) { |
86acf0da DG |
1105 | ret = 0; |
1106 | goto error; | |
53a80697 MD |
1107 | } |
1108 | ||
1109 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1110 | ua_event->obj); | |
1111 | if (ret < 0) { | |
ffe60014 DG |
1112 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1113 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1114 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1115 | } else { | |
3757b385 DG |
1116 | /* |
1117 | * This is normal behavior, an application can die during the | |
1118 | * creation process. Don't report an error so the execution can | |
1119 | * continue normally. | |
1120 | */ | |
1121 | ret = 0; | |
ffe60014 DG |
1122 | DBG3("UST app filter event failed. Application is dead."); |
1123 | } | |
53a80697 MD |
1124 | goto error; |
1125 | } | |
1126 | ||
1127 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1128 | ||
1129 | error: | |
840cb59c | 1130 | health_code_update(); |
53a80697 MD |
1131 | return ret; |
1132 | } | |
1133 | ||
9730260e DG |
1134 | /* |
1135 | * Disable the specified event on to UST tracer for the UST session. | |
1136 | */ | |
1137 | static int disable_ust_event(struct ust_app *app, | |
1138 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1139 | { | |
1140 | int ret; | |
1141 | ||
840cb59c | 1142 | health_code_update(); |
86acf0da | 1143 | |
852d0037 | 1144 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1145 | if (ret < 0) { |
ffe60014 DG |
1146 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1147 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1148 | "and session handle %d with ret %d", | |
1149 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1150 | } else { | |
3757b385 DG |
1151 | /* |
1152 | * This is normal behavior, an application can die during the | |
1153 | * creation process. Don't report an error so the execution can | |
1154 | * continue normally. | |
1155 | */ | |
1156 | ret = 0; | |
ffe60014 DG |
1157 | DBG3("UST app disable event failed. Application is dead."); |
1158 | } | |
9730260e DG |
1159 | goto error; |
1160 | } | |
1161 | ||
1162 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1163 | ua_event->attr.name, app->pid); |
9730260e DG |
1164 | |
1165 | error: | |
840cb59c | 1166 | health_code_update(); |
9730260e DG |
1167 | return ret; |
1168 | } | |
1169 | ||
78f0bacd DG |
1170 | /* |
1171 | * Disable the specified channel on to UST tracer for the UST session. | |
1172 | */ | |
1173 | static int disable_ust_channel(struct ust_app *app, | |
1174 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1175 | { | |
1176 | int ret; | |
1177 | ||
840cb59c | 1178 | health_code_update(); |
86acf0da | 1179 | |
852d0037 | 1180 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1181 | if (ret < 0) { |
ffe60014 DG |
1182 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1183 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1184 | "and session handle %d with ret %d", | |
1185 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1186 | } else { | |
3757b385 DG |
1187 | /* |
1188 | * This is normal behavior, an application can die during the | |
1189 | * creation process. Don't report an error so the execution can | |
1190 | * continue normally. | |
1191 | */ | |
1192 | ret = 0; | |
ffe60014 DG |
1193 | DBG3("UST app disable channel failed. Application is dead."); |
1194 | } | |
78f0bacd DG |
1195 | goto error; |
1196 | } | |
1197 | ||
78f0bacd | 1198 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1199 | ua_chan->name, app->pid); |
78f0bacd DG |
1200 | |
1201 | error: | |
840cb59c | 1202 | health_code_update(); |
78f0bacd DG |
1203 | return ret; |
1204 | } | |
1205 | ||
1206 | /* | |
1207 | * Enable the specified channel on to UST tracer for the UST session. | |
1208 | */ | |
1209 | static int enable_ust_channel(struct ust_app *app, | |
1210 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1211 | { | |
1212 | int ret; | |
1213 | ||
840cb59c | 1214 | health_code_update(); |
86acf0da | 1215 | |
852d0037 | 1216 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1217 | if (ret < 0) { |
ffe60014 DG |
1218 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1219 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1220 | "and session handle %d with ret %d", | |
1221 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1222 | } else { | |
3757b385 DG |
1223 | /* |
1224 | * This is normal behavior, an application can die during the | |
1225 | * creation process. Don't report an error so the execution can | |
1226 | * continue normally. | |
1227 | */ | |
1228 | ret = 0; | |
ffe60014 DG |
1229 | DBG3("UST app enable channel failed. Application is dead."); |
1230 | } | |
78f0bacd DG |
1231 | goto error; |
1232 | } | |
1233 | ||
1234 | ua_chan->enabled = 1; | |
1235 | ||
1236 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1237 | ua_chan->name, app->pid); |
78f0bacd DG |
1238 | |
1239 | error: | |
840cb59c | 1240 | health_code_update(); |
78f0bacd DG |
1241 | return ret; |
1242 | } | |
1243 | ||
edb67388 DG |
1244 | /* |
1245 | * Enable the specified event on to UST tracer for the UST session. | |
1246 | */ | |
1247 | static int enable_ust_event(struct ust_app *app, | |
1248 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1249 | { | |
1250 | int ret; | |
1251 | ||
840cb59c | 1252 | health_code_update(); |
86acf0da | 1253 | |
852d0037 | 1254 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1255 | if (ret < 0) { |
ffe60014 DG |
1256 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1257 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1258 | "and session handle %d with ret %d", | |
1259 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1260 | } else { | |
3757b385 DG |
1261 | /* |
1262 | * This is normal behavior, an application can die during the | |
1263 | * creation process. Don't report an error so the execution can | |
1264 | * continue normally. | |
1265 | */ | |
1266 | ret = 0; | |
ffe60014 DG |
1267 | DBG3("UST app enable event failed. Application is dead."); |
1268 | } | |
edb67388 DG |
1269 | goto error; |
1270 | } | |
1271 | ||
1272 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1273 | ua_event->attr.name, app->pid); |
edb67388 DG |
1274 | |
1275 | error: | |
840cb59c | 1276 | health_code_update(); |
edb67388 DG |
1277 | return ret; |
1278 | } | |
1279 | ||
099e26bd | 1280 | /* |
7972aab2 | 1281 | * Send channel and stream buffer to application. |
4f3ab6ee | 1282 | * |
ffe60014 | 1283 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1284 | */ |
7972aab2 DG |
1285 | static int send_channel_pid_to_ust(struct ust_app *app, |
1286 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1287 | { |
1288 | int ret; | |
ffe60014 | 1289 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1290 | |
1291 | assert(app); | |
ffe60014 | 1292 | assert(ua_sess); |
4f3ab6ee | 1293 | assert(ua_chan); |
4f3ab6ee | 1294 | |
840cb59c | 1295 | health_code_update(); |
4f3ab6ee | 1296 | |
7972aab2 DG |
1297 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1298 | app->sock); | |
86acf0da | 1299 | |
ffe60014 DG |
1300 | /* Send channel to the application. */ |
1301 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1302 | if (ret < 0) { |
b551a063 DG |
1303 | goto error; |
1304 | } | |
1305 | ||
d88aee68 DG |
1306 | health_code_update(); |
1307 | ||
ffe60014 DG |
1308 | /* Send all streams to application. */ |
1309 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1310 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1311 | if (ret < 0) { | |
1312 | goto error; | |
1313 | } | |
1314 | /* We don't need the stream anymore once sent to the tracer. */ | |
1315 | cds_list_del(&stream->list); | |
1316 | delete_ust_app_stream(-1, stream); | |
1317 | } | |
ffe60014 DG |
1318 | /* Flag the channel that it is sent to the application. */ |
1319 | ua_chan->is_sent = 1; | |
ffe60014 | 1320 | |
b551a063 | 1321 | error: |
840cb59c | 1322 | health_code_update(); |
b551a063 DG |
1323 | return ret; |
1324 | } | |
1325 | ||
91d76f53 | 1326 | /* |
5b4a0ec0 | 1327 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1328 | * |
1329 | * Should be called with session mutex held. | |
91d76f53 | 1330 | */ |
edb67388 DG |
1331 | static |
1332 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1333 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1334 | { |
5b4a0ec0 | 1335 | int ret = 0; |
284d8f55 | 1336 | |
840cb59c | 1337 | health_code_update(); |
86acf0da | 1338 | |
5b4a0ec0 | 1339 | /* Create UST event on tracer */ |
852d0037 | 1340 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1341 | &ua_event->obj); |
1342 | if (ret < 0) { | |
ffe60014 DG |
1343 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1344 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1345 | ua_event->attr.name, app->pid, ret); | |
1346 | } else { | |
3757b385 DG |
1347 | /* |
1348 | * This is normal behavior, an application can die during the | |
1349 | * creation process. Don't report an error so the execution can | |
1350 | * continue normally. | |
1351 | */ | |
1352 | ret = 0; | |
ffe60014 DG |
1353 | DBG3("UST app create event failed. Application is dead."); |
1354 | } | |
5b4a0ec0 | 1355 | goto error; |
91d76f53 | 1356 | } |
f6a9efaa | 1357 | |
5b4a0ec0 | 1358 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1359 | |
5b4a0ec0 | 1360 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1361 | ua_event->attr.name, app->pid); |
f6a9efaa | 1362 | |
840cb59c | 1363 | health_code_update(); |
86acf0da | 1364 | |
025faf73 DG |
1365 | /* Set filter if one is present. */ |
1366 | if (ua_event->filter) { | |
1367 | ret = set_ust_event_filter(ua_event, app); | |
1368 | if (ret < 0) { | |
1369 | goto error; | |
1370 | } | |
1371 | } | |
1372 | ||
8535a6d9 | 1373 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 1374 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
1375 | ret = disable_ust_event(app, ua_sess, ua_event); |
1376 | if (ret < 0) { | |
fc34caaa DG |
1377 | /* |
1378 | * If we hit an EPERM, something is wrong with our disable call. If | |
1379 | * we get an EEXIST, there is a problem on the tracer side since we | |
1380 | * just created it. | |
1381 | */ | |
1382 | switch (ret) { | |
49c336c1 | 1383 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1384 | /* Code flow problem */ |
1385 | assert(0); | |
49c336c1 | 1386 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1387 | /* It's OK for our use case. */ |
1388 | ret = 0; | |
1389 | break; | |
1390 | default: | |
1391 | break; | |
1392 | } | |
8535a6d9 DG |
1393 | goto error; |
1394 | } | |
1395 | } | |
1396 | ||
5b4a0ec0 | 1397 | error: |
840cb59c | 1398 | health_code_update(); |
5b4a0ec0 | 1399 | return ret; |
91d76f53 | 1400 | } |
48842b30 | 1401 | |
5b4a0ec0 DG |
1402 | /* |
1403 | * Copy data between an UST app event and a LTT event. | |
1404 | */ | |
421cb601 | 1405 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1406 | struct ltt_ust_event *uevent) |
1407 | { | |
1408 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); | |
1409 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1410 | ||
fc34caaa DG |
1411 | ua_event->enabled = uevent->enabled; |
1412 | ||
5b4a0ec0 DG |
1413 | /* Copy event attributes */ |
1414 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1415 | ||
53a80697 MD |
1416 | /* Copy filter bytecode */ |
1417 | if (uevent->filter) { | |
025faf73 DG |
1418 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1419 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1420 | } |
48842b30 DG |
1421 | } |
1422 | ||
5b4a0ec0 DG |
1423 | /* |
1424 | * Copy data between an UST app channel and a LTT channel. | |
1425 | */ | |
421cb601 | 1426 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1427 | struct ltt_ust_channel *uchan) |
1428 | { | |
bec39940 | 1429 | struct lttng_ht_iter iter; |
48842b30 | 1430 | struct ltt_ust_event *uevent; |
55cc08a6 | 1431 | struct ltt_ust_context *uctx; |
48842b30 | 1432 | struct ust_app_event *ua_event; |
55cc08a6 | 1433 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1434 | |
fc34caaa | 1435 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1436 | |
1437 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1438 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1439 | |
1624d5b7 JD |
1440 | ua_chan->tracefile_size = uchan->tracefile_size; |
1441 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1442 | ||
ffe60014 DG |
1443 | /* Copy event attributes since the layout is different. */ |
1444 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1445 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1446 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1447 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1448 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1449 | ua_chan->attr.output = uchan->attr.output; | |
1450 | /* | |
1451 | * Note that the attribute channel type is not set since the channel on the | |
1452 | * tracing registry side does not have this information. | |
1453 | */ | |
48842b30 | 1454 | |
fc34caaa | 1455 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1456 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1457 | |
31746f93 | 1458 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1459 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1460 | if (ua_ctx == NULL) { | |
1461 | continue; | |
1462 | } | |
bec39940 DG |
1463 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1464 | (unsigned long) ua_ctx->ctx.ctx); | |
1465 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
31746f93 | 1466 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1467 | } |
48842b30 | 1468 | |
421cb601 | 1469 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1470 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b DG |
1471 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
1472 | uevent->filter, uevent->attr.loglevel); | |
1473 | if (ua_event == NULL) { | |
421cb601 | 1474 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1475 | uevent->attr.name); |
284d8f55 | 1476 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1477 | if (ua_event == NULL) { |
5b4a0ec0 | 1478 | continue; |
48842b30 | 1479 | } |
421cb601 | 1480 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1481 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1482 | } |
48842b30 DG |
1483 | } |
1484 | ||
fc34caaa | 1485 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1486 | } |
1487 | ||
5b4a0ec0 DG |
1488 | /* |
1489 | * Copy data between a UST app session and a regular LTT session. | |
1490 | */ | |
421cb601 | 1491 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1492 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1493 | { |
bec39940 DG |
1494 | struct lttng_ht_node_str *ua_chan_node; |
1495 | struct lttng_ht_iter iter; | |
48842b30 DG |
1496 | struct ltt_ust_channel *uchan; |
1497 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1498 | time_t rawtime; |
1499 | struct tm *timeinfo; | |
1500 | char datetime[16]; | |
1501 | int ret; | |
1502 | ||
1503 | /* Get date and time for unique app path */ | |
1504 | time(&rawtime); | |
1505 | timeinfo = localtime(&rawtime); | |
1506 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1507 | |
421cb601 | 1508 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1509 | |
7972aab2 DG |
1510 | ua_sess->tracing_id = usess->id; |
1511 | ua_sess->id = get_next_session_id(); | |
1512 | ua_sess->uid = app->uid; | |
1513 | ua_sess->gid = app->gid; | |
1514 | ua_sess->euid = usess->uid; | |
1515 | ua_sess->egid = usess->gid; | |
1516 | ua_sess->buffer_type = usess->buffer_type; | |
1517 | ua_sess->bits_per_long = app->bits_per_long; | |
1518 | /* There is only one consumer object per session possible. */ | |
1519 | ua_sess->consumer = usess->consumer; | |
2bba9e53 | 1520 | ua_sess->output_traces = usess->output_traces; |
7972aab2 DG |
1521 | |
1522 | switch (ua_sess->buffer_type) { | |
1523 | case LTTNG_BUFFER_PER_PID: | |
1524 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1525 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1526 | datetime); |
1527 | break; | |
1528 | case LTTNG_BUFFER_PER_UID: | |
1529 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1530 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1531 | break; | |
1532 | default: | |
1533 | assert(0); | |
1534 | goto error; | |
1535 | } | |
477d7741 MD |
1536 | if (ret < 0) { |
1537 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1538 | assert(0); |
7972aab2 | 1539 | goto error; |
477d7741 MD |
1540 | } |
1541 | ||
48842b30 | 1542 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1543 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1544 | uchan, node.node) { | |
1545 | struct lttng_ht_iter uiter; | |
ba767faf | 1546 | |
bec39940 DG |
1547 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1548 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1549 | if (ua_chan_node != NULL) { |
fc34caaa | 1550 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1551 | continue; |
1552 | } | |
421cb601 | 1553 | |
5b4a0ec0 DG |
1554 | DBG2("Channel %s not found on shadow session copy, creating it", |
1555 | uchan->name); | |
d0b96690 | 1556 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1557 | if (ua_chan == NULL) { |
fc34caaa | 1558 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1559 | continue; |
48842b30 | 1560 | } |
5b4a0ec0 | 1561 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1562 | /* |
1563 | * The concept of metadata channel does not exist on the tracing | |
1564 | * registry side of the session daemon so this can only be a per CPU | |
1565 | * channel and not metadata. | |
1566 | */ | |
1567 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1568 | ||
bec39940 | 1569 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1570 | } |
7972aab2 DG |
1571 | |
1572 | error: | |
1573 | return; | |
48842b30 DG |
1574 | } |
1575 | ||
78f0bacd DG |
1576 | /* |
1577 | * Lookup sesison wrapper. | |
1578 | */ | |
84cd17c6 MD |
1579 | static |
1580 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1581 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1582 | { |
1583 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1584 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1585 | } |
1586 | ||
421cb601 DG |
1587 | /* |
1588 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1589 | * id. |
421cb601 | 1590 | */ |
48842b30 DG |
1591 | static struct ust_app_session *lookup_session_by_app( |
1592 | struct ltt_ust_session *usess, struct ust_app *app) | |
1593 | { | |
bec39940 | 1594 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1595 | struct lttng_ht_node_u64 *node; |
48842b30 | 1596 | |
84cd17c6 | 1597 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1598 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1599 | if (node == NULL) { |
1600 | goto error; | |
1601 | } | |
1602 | ||
1603 | return caa_container_of(node, struct ust_app_session, node); | |
1604 | ||
1605 | error: | |
1606 | return NULL; | |
1607 | } | |
1608 | ||
7972aab2 DG |
1609 | /* |
1610 | * Setup buffer registry per PID for the given session and application. If none | |
1611 | * is found, a new one is created, added to the global registry and | |
1612 | * initialized. If regp is valid, it's set with the newly created object. | |
1613 | * | |
1614 | * Return 0 on success or else a negative value. | |
1615 | */ | |
1616 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1617 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1618 | { | |
1619 | int ret = 0; | |
1620 | struct buffer_reg_pid *reg_pid; | |
1621 | ||
1622 | assert(ua_sess); | |
1623 | assert(app); | |
1624 | ||
1625 | rcu_read_lock(); | |
1626 | ||
1627 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1628 | if (!reg_pid) { | |
1629 | /* | |
1630 | * This is the create channel path meaning that if there is NO | |
1631 | * registry available, we have to create one for this session. | |
1632 | */ | |
1633 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1634 | if (ret < 0) { | |
1635 | goto error; | |
1636 | } | |
1637 | buffer_reg_pid_add(reg_pid); | |
1638 | } else { | |
1639 | goto end; | |
1640 | } | |
1641 | ||
1642 | /* Initialize registry. */ | |
1643 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1644 | app->bits_per_long, app->uint8_t_alignment, | |
1645 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1646 | app->uint64_t_alignment, app->long_alignment, |
1647 | app->byte_order, app->version.major, | |
1648 | app->version.minor); | |
7972aab2 DG |
1649 | if (ret < 0) { |
1650 | goto error; | |
1651 | } | |
1652 | ||
1653 | DBG3("UST app buffer registry per PID created successfully"); | |
1654 | ||
1655 | end: | |
1656 | if (regp) { | |
1657 | *regp = reg_pid; | |
1658 | } | |
1659 | error: | |
1660 | rcu_read_unlock(); | |
1661 | return ret; | |
1662 | } | |
1663 | ||
1664 | /* | |
1665 | * Setup buffer registry per UID for the given session and application. If none | |
1666 | * is found, a new one is created, added to the global registry and | |
1667 | * initialized. If regp is valid, it's set with the newly created object. | |
1668 | * | |
1669 | * Return 0 on success or else a negative value. | |
1670 | */ | |
1671 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1672 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1673 | { | |
1674 | int ret = 0; | |
1675 | struct buffer_reg_uid *reg_uid; | |
1676 | ||
1677 | assert(usess); | |
1678 | assert(app); | |
1679 | ||
1680 | rcu_read_lock(); | |
1681 | ||
1682 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1683 | if (!reg_uid) { | |
1684 | /* | |
1685 | * This is the create channel path meaning that if there is NO | |
1686 | * registry available, we have to create one for this session. | |
1687 | */ | |
1688 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1689 | LTTNG_DOMAIN_UST, ®_uid); | |
1690 | if (ret < 0) { | |
1691 | goto error; | |
1692 | } | |
1693 | buffer_reg_uid_add(reg_uid); | |
1694 | } else { | |
1695 | goto end; | |
1696 | } | |
1697 | ||
1698 | /* Initialize registry. */ | |
af6142cf | 1699 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1700 | app->bits_per_long, app->uint8_t_alignment, |
1701 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1702 | app->uint64_t_alignment, app->long_alignment, |
1703 | app->byte_order, app->version.major, | |
1704 | app->version.minor); | |
7972aab2 DG |
1705 | if (ret < 0) { |
1706 | goto error; | |
1707 | } | |
1708 | /* Add node to teardown list of the session. */ | |
1709 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1710 | ||
1711 | DBG3("UST app buffer registry per UID created successfully"); | |
1712 | ||
1713 | end: | |
1714 | if (regp) { | |
1715 | *regp = reg_uid; | |
1716 | } | |
1717 | error: | |
1718 | rcu_read_unlock(); | |
1719 | return ret; | |
1720 | } | |
1721 | ||
421cb601 | 1722 | /* |
3d8ca23b | 1723 | * Create a session on the tracer side for the given app. |
421cb601 | 1724 | * |
3d8ca23b DG |
1725 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1726 | * untouched. If the session was created, is_created is set to 1. On error, | |
1727 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1728 | * be NULL. | |
1729 | * | |
1730 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1731 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1732 | */ |
3d8ca23b DG |
1733 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1734 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1735 | int *is_created) | |
421cb601 | 1736 | { |
3d8ca23b | 1737 | int ret, created = 0; |
421cb601 DG |
1738 | struct ust_app_session *ua_sess; |
1739 | ||
3d8ca23b DG |
1740 | assert(usess); |
1741 | assert(app); | |
1742 | assert(ua_sess_ptr); | |
1743 | ||
840cb59c | 1744 | health_code_update(); |
86acf0da | 1745 | |
421cb601 DG |
1746 | ua_sess = lookup_session_by_app(usess, app); |
1747 | if (ua_sess == NULL) { | |
d9bf3ca4 | 1748 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1749 | app->pid, usess->id); |
d0b96690 | 1750 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1751 | if (ua_sess == NULL) { |
1752 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1753 | ret = -ENOMEM; |
1754 | goto error; | |
421cb601 | 1755 | } |
477d7741 | 1756 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1757 | created = 1; |
421cb601 DG |
1758 | } |
1759 | ||
7972aab2 DG |
1760 | switch (usess->buffer_type) { |
1761 | case LTTNG_BUFFER_PER_PID: | |
1762 | /* Init local registry. */ | |
1763 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1764 | if (ret < 0) { |
7972aab2 DG |
1765 | goto error; |
1766 | } | |
1767 | break; | |
1768 | case LTTNG_BUFFER_PER_UID: | |
1769 | /* Look for a global registry. If none exists, create one. */ | |
1770 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1771 | if (ret < 0) { | |
1772 | goto error; | |
1773 | } | |
1774 | break; | |
1775 | default: | |
1776 | assert(0); | |
1777 | ret = -EINVAL; | |
1778 | goto error; | |
1779 | } | |
1780 | ||
1781 | health_code_update(); | |
1782 | ||
1783 | if (ua_sess->handle == -1) { | |
1784 | ret = ustctl_create_session(app->sock); | |
1785 | if (ret < 0) { | |
1786 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1787 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1788 | app->pid, ret); |
1789 | } else { | |
1790 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
1791 | /* |
1792 | * This is normal behavior, an application can die during the | |
1793 | * creation process. Don't report an error so the execution can | |
1794 | * continue normally. This will get flagged ENOTCONN and the | |
1795 | * caller will handle it. | |
1796 | */ | |
1797 | ret = 0; | |
ffe60014 | 1798 | } |
d0b96690 | 1799 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1800 | if (ret != -ENOMEM) { |
1801 | /* | |
1802 | * Tracer is probably gone or got an internal error so let's | |
1803 | * behave like it will soon unregister or not usable. | |
1804 | */ | |
1805 | ret = -ENOTCONN; | |
1806 | } | |
1807 | goto error; | |
421cb601 DG |
1808 | } |
1809 | ||
7972aab2 DG |
1810 | ua_sess->handle = ret; |
1811 | ||
1812 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
1813 | lttng_ht_node_init_u64(&ua_sess->node, |
1814 | ua_sess->tracing_id); | |
1815 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1816 | |
1817 | DBG2("UST app session created successfully with handle %d", ret); | |
1818 | } | |
1819 | ||
1820 | *ua_sess_ptr = ua_sess; | |
1821 | if (is_created) { | |
1822 | *is_created = created; | |
1823 | } | |
1824 | ||
1825 | /* Everything went well. */ | |
1826 | ret = 0; | |
1827 | ||
1828 | error: | |
1829 | health_code_update(); | |
1830 | return ret; | |
1831 | } | |
1832 | ||
1833 | /* | |
1834 | * Create a context for the channel on the tracer. | |
1835 | * | |
1836 | * Called with UST app session lock held and a RCU read side lock. | |
1837 | */ | |
1838 | static | |
1839 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1840 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1841 | struct ust_app *app) | |
1842 | { | |
1843 | int ret = 0; | |
1844 | struct lttng_ht_iter iter; | |
1845 | struct lttng_ht_node_ulong *node; | |
1846 | struct ust_app_ctx *ua_ctx; | |
1847 | ||
1848 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1849 | ||
1850 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); | |
1851 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1852 | if (node != NULL) { | |
1853 | ret = -EEXIST; | |
1854 | goto error; | |
1855 | } | |
1856 | ||
1857 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1858 | if (ua_ctx == NULL) { | |
1859 | /* malloc failed */ | |
1860 | ret = -1; | |
1861 | goto error; | |
1862 | } | |
1863 | ||
1864 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
1865 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
31746f93 | 1866 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
1867 | |
1868 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1869 | if (ret < 0) { | |
1870 | goto error; | |
1871 | } | |
1872 | ||
1873 | error: | |
1874 | return ret; | |
1875 | } | |
1876 | ||
1877 | /* | |
1878 | * Enable on the tracer side a ust app event for the session and channel. | |
1879 | * | |
1880 | * Called with UST app session lock held. | |
1881 | */ | |
1882 | static | |
1883 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
1884 | struct ust_app_event *ua_event, struct ust_app *app) | |
1885 | { | |
1886 | int ret; | |
1887 | ||
1888 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1889 | if (ret < 0) { | |
1890 | goto error; | |
1891 | } | |
1892 | ||
1893 | ua_event->enabled = 1; | |
1894 | ||
1895 | error: | |
1896 | return ret; | |
1897 | } | |
1898 | ||
1899 | /* | |
1900 | * Disable on the tracer side a ust app event for the session and channel. | |
1901 | */ | |
1902 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
1903 | struct ust_app_event *ua_event, struct ust_app *app) | |
1904 | { | |
1905 | int ret; | |
1906 | ||
1907 | ret = disable_ust_event(app, ua_sess, ua_event); | |
1908 | if (ret < 0) { | |
1909 | goto error; | |
1910 | } | |
1911 | ||
1912 | ua_event->enabled = 0; | |
1913 | ||
1914 | error: | |
1915 | return ret; | |
1916 | } | |
1917 | ||
1918 | /* | |
1919 | * Lookup ust app channel for session and disable it on the tracer side. | |
1920 | */ | |
1921 | static | |
1922 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
1923 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
1924 | { | |
1925 | int ret; | |
1926 | ||
1927 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
1928 | if (ret < 0) { | |
1929 | goto error; | |
1930 | } | |
1931 | ||
1932 | ua_chan->enabled = 0; | |
1933 | ||
1934 | error: | |
1935 | return ret; | |
1936 | } | |
1937 | ||
1938 | /* | |
1939 | * Lookup ust app channel for session and enable it on the tracer side. This | |
1940 | * MUST be called with a RCU read side lock acquired. | |
1941 | */ | |
1942 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
1943 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
1944 | { | |
1945 | int ret = 0; | |
1946 | struct lttng_ht_iter iter; | |
1947 | struct lttng_ht_node_str *ua_chan_node; | |
1948 | struct ust_app_channel *ua_chan; | |
1949 | ||
1950 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
1951 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
1952 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 1953 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
1954 | uchan->name, ua_sess->tracing_id); |
1955 | goto error; | |
1956 | } | |
1957 | ||
1958 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
1959 | ||
1960 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
1961 | if (ret < 0) { | |
1962 | goto error; | |
1963 | } | |
1964 | ||
1965 | error: | |
1966 | return ret; | |
1967 | } | |
1968 | ||
1969 | /* | |
1970 | * Ask the consumer to create a channel and get it if successful. | |
1971 | * | |
1972 | * Return 0 on success or else a negative value. | |
1973 | */ | |
1974 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
1975 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
1976 | int bitness, struct ust_registry_session *registry) | |
1977 | { | |
1978 | int ret; | |
1979 | unsigned int nb_fd = 0; | |
1980 | struct consumer_socket *socket; | |
1981 | ||
1982 | assert(usess); | |
1983 | assert(ua_sess); | |
1984 | assert(ua_chan); | |
1985 | assert(registry); | |
1986 | ||
1987 | rcu_read_lock(); | |
1988 | health_code_update(); | |
1989 | ||
1990 | /* Get the right consumer socket for the application. */ | |
1991 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
1992 | if (!socket) { | |
1993 | ret = -EINVAL; | |
1994 | goto error; | |
1995 | } | |
1996 | ||
1997 | health_code_update(); | |
1998 | ||
1999 | /* Need one fd for the channel. */ | |
2000 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2001 | if (ret < 0) { | |
2002 | ERR("Exhausted number of available FD upon create channel"); | |
2003 | goto error; | |
2004 | } | |
2005 | ||
2006 | /* | |
2007 | * Ask consumer to create channel. The consumer will return the number of | |
2008 | * stream we have to expect. | |
2009 | */ | |
2010 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2011 | registry); | |
2012 | if (ret < 0) { | |
2013 | goto error_ask; | |
2014 | } | |
2015 | ||
2016 | /* | |
2017 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2018 | * stream (2 being the default value here). | |
2019 | */ | |
2020 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2021 | ||
2022 | /* Reserve the amount of file descriptor we need. */ | |
2023 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2024 | if (ret < 0) { | |
2025 | ERR("Exhausted number of available FD upon create channel"); | |
2026 | goto error_fd_get_stream; | |
2027 | } | |
2028 | ||
2029 | health_code_update(); | |
2030 | ||
2031 | /* | |
2032 | * Now get the channel from the consumer. This call wil populate the stream | |
2033 | * list of that channel and set the ust objects. | |
2034 | */ | |
d9078d0c DG |
2035 | if (usess->consumer->enabled) { |
2036 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2037 | if (ret < 0) { | |
2038 | goto error_destroy; | |
2039 | } | |
7972aab2 DG |
2040 | } |
2041 | ||
2042 | rcu_read_unlock(); | |
2043 | return 0; | |
2044 | ||
2045 | error_destroy: | |
2046 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2047 | error_fd_get_stream: | |
2048 | /* | |
2049 | * Initiate a destroy channel on the consumer since we had an error | |
2050 | * handling it on our side. The return value is of no importance since we | |
2051 | * already have a ret value set by the previous error that we need to | |
2052 | * return. | |
2053 | */ | |
2054 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2055 | error_ask: | |
2056 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2057 | error: | |
2058 | health_code_update(); | |
2059 | rcu_read_unlock(); | |
2060 | return ret; | |
2061 | } | |
2062 | ||
2063 | /* | |
2064 | * Duplicate the ust data object of the ust app stream and save it in the | |
2065 | * buffer registry stream. | |
2066 | * | |
2067 | * Return 0 on success or else a negative value. | |
2068 | */ | |
2069 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2070 | struct ust_app_stream *stream) | |
2071 | { | |
2072 | int ret; | |
2073 | ||
2074 | assert(reg_stream); | |
2075 | assert(stream); | |
2076 | ||
2077 | /* Reserve the amount of file descriptor we need. */ | |
2078 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2079 | if (ret < 0) { | |
2080 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2081 | goto error; | |
2082 | } | |
2083 | ||
2084 | /* Duplicate object for stream once the original is in the registry. */ | |
2085 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2086 | reg_stream->obj.ust); | |
2087 | if (ret < 0) { | |
2088 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2089 | reg_stream->obj.ust, stream->obj, ret); | |
2090 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2091 | goto error; | |
2092 | } | |
2093 | stream->handle = stream->obj->handle; | |
2094 | ||
2095 | error: | |
2096 | return ret; | |
2097 | } | |
2098 | ||
2099 | /* | |
2100 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2101 | * buffer registry channel. | |
2102 | * | |
2103 | * Return 0 on success or else a negative value. | |
2104 | */ | |
2105 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2106 | struct ust_app_channel *ua_chan) | |
2107 | { | |
2108 | int ret; | |
2109 | ||
2110 | assert(reg_chan); | |
2111 | assert(ua_chan); | |
2112 | ||
2113 | /* Need two fds for the channel. */ | |
2114 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2115 | if (ret < 0) { | |
2116 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2117 | goto error_fd_get; | |
2118 | } | |
2119 | ||
2120 | /* Duplicate object for stream once the original is in the registry. */ | |
2121 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2122 | if (ret < 0) { | |
2123 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2124 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2125 | goto error; | |
2126 | } | |
2127 | ua_chan->handle = ua_chan->obj->handle; | |
2128 | ||
2129 | return 0; | |
2130 | ||
2131 | error: | |
2132 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2133 | error_fd_get: | |
2134 | return ret; | |
2135 | } | |
2136 | ||
2137 | /* | |
2138 | * For a given channel buffer registry, setup all streams of the given ust | |
2139 | * application channel. | |
2140 | * | |
2141 | * Return 0 on success or else a negative value. | |
2142 | */ | |
2143 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2144 | struct ust_app_channel *ua_chan) | |
2145 | { | |
2146 | int ret = 0; | |
2147 | struct ust_app_stream *stream, *stmp; | |
2148 | ||
2149 | assert(reg_chan); | |
2150 | assert(ua_chan); | |
2151 | ||
2152 | DBG2("UST app setup buffer registry stream"); | |
2153 | ||
2154 | /* Send all streams to application. */ | |
2155 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2156 | struct buffer_reg_stream *reg_stream; | |
2157 | ||
2158 | ret = buffer_reg_stream_create(®_stream); | |
2159 | if (ret < 0) { | |
2160 | goto error; | |
2161 | } | |
2162 | ||
2163 | /* | |
2164 | * Keep original pointer and nullify it in the stream so the delete | |
2165 | * stream call does not release the object. | |
2166 | */ | |
2167 | reg_stream->obj.ust = stream->obj; | |
2168 | stream->obj = NULL; | |
2169 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2170 | |
7972aab2 DG |
2171 | /* We don't need the streams anymore. */ |
2172 | cds_list_del(&stream->list); | |
2173 | delete_ust_app_stream(-1, stream); | |
2174 | } | |
421cb601 | 2175 | |
7972aab2 DG |
2176 | error: |
2177 | return ret; | |
2178 | } | |
2179 | ||
2180 | /* | |
2181 | * Create a buffer registry channel for the given session registry and | |
2182 | * application channel object. If regp pointer is valid, it's set with the | |
2183 | * created object. Important, the created object is NOT added to the session | |
2184 | * registry hash table. | |
2185 | * | |
2186 | * Return 0 on success else a negative value. | |
2187 | */ | |
2188 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2189 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2190 | { | |
2191 | int ret; | |
2192 | struct buffer_reg_channel *reg_chan = NULL; | |
2193 | ||
2194 | assert(reg_sess); | |
2195 | assert(ua_chan); | |
2196 | ||
2197 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2198 | ||
2199 | /* Create buffer registry channel. */ | |
2200 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2201 | if (ret < 0) { | |
2202 | goto error_create; | |
421cb601 | 2203 | } |
7972aab2 DG |
2204 | assert(reg_chan); |
2205 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2206 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
421cb601 | 2207 | |
7972aab2 DG |
2208 | /* Create and add a channel registry to session. */ |
2209 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2210 | ua_chan->tracing_channel_id); | |
2211 | if (ret < 0) { | |
2212 | goto error; | |
d88aee68 | 2213 | } |
7972aab2 | 2214 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2215 | |
7972aab2 DG |
2216 | if (regp) { |
2217 | *regp = reg_chan; | |
3d8ca23b | 2218 | } |
d88aee68 | 2219 | |
7972aab2 | 2220 | return 0; |
3d8ca23b DG |
2221 | |
2222 | error: | |
7972aab2 DG |
2223 | /* Safe because the registry channel object was not added to any HT. */ |
2224 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2225 | error_create: | |
3d8ca23b | 2226 | return ret; |
421cb601 DG |
2227 | } |
2228 | ||
55cc08a6 | 2229 | /* |
7972aab2 DG |
2230 | * Setup buffer registry channel for the given session registry and application |
2231 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2232 | * |
7972aab2 | 2233 | * Return 0 on success else a negative value. |
55cc08a6 | 2234 | */ |
7972aab2 DG |
2235 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2236 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2237 | { |
7972aab2 | 2238 | int ret; |
55cc08a6 | 2239 | |
7972aab2 DG |
2240 | assert(reg_sess); |
2241 | assert(reg_chan); | |
2242 | assert(ua_chan); | |
2243 | assert(ua_chan->obj); | |
55cc08a6 | 2244 | |
7972aab2 | 2245 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2246 | |
7972aab2 DG |
2247 | /* Setup all streams for the registry. */ |
2248 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2249 | if (ret < 0) { | |
55cc08a6 DG |
2250 | goto error; |
2251 | } | |
2252 | ||
7972aab2 DG |
2253 | reg_chan->obj.ust = ua_chan->obj; |
2254 | ua_chan->obj = NULL; | |
55cc08a6 | 2255 | |
7972aab2 | 2256 | return 0; |
55cc08a6 DG |
2257 | |
2258 | error: | |
7972aab2 DG |
2259 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2260 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2261 | return ret; |
2262 | } | |
2263 | ||
edb67388 | 2264 | /* |
7972aab2 | 2265 | * Send buffer registry channel to the application. |
d0b96690 | 2266 | * |
7972aab2 | 2267 | * Return 0 on success else a negative value. |
edb67388 | 2268 | */ |
7972aab2 DG |
2269 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2270 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2271 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2272 | { |
2273 | int ret; | |
7972aab2 | 2274 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2275 | |
7972aab2 DG |
2276 | assert(reg_chan); |
2277 | assert(app); | |
2278 | assert(ua_sess); | |
2279 | assert(ua_chan); | |
2280 | ||
2281 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2282 | ||
2283 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2284 | if (ret < 0) { |
2285 | goto error; | |
2286 | } | |
2287 | ||
7972aab2 DG |
2288 | /* Send channel to the application. */ |
2289 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2290 | if (ret < 0) { | |
2291 | goto error; | |
2292 | } | |
2293 | ||
2294 | health_code_update(); | |
2295 | ||
2296 | /* Send all streams to application. */ | |
2297 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2298 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2299 | struct ust_app_stream stream; | |
2300 | ||
2301 | ret = duplicate_stream_object(reg_stream, &stream); | |
2302 | if (ret < 0) { | |
2303 | goto error_stream_unlock; | |
2304 | } | |
2305 | ||
2306 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2307 | if (ret < 0) { | |
8c067051 | 2308 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2309 | goto error_stream_unlock; |
2310 | } | |
edb67388 | 2311 | |
7972aab2 DG |
2312 | /* |
2313 | * The return value is not important here. This function will output an | |
2314 | * error if needed. | |
2315 | */ | |
2316 | (void) release_ust_app_stream(-1, &stream); | |
2317 | } | |
2318 | ua_chan->is_sent = 1; | |
2319 | ||
2320 | error_stream_unlock: | |
2321 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2322 | error: |
2323 | return ret; | |
2324 | } | |
2325 | ||
9730260e | 2326 | /* |
7972aab2 DG |
2327 | * Create and send to the application the created buffers with per UID buffers. |
2328 | * | |
2329 | * Return 0 on success else a negative value. | |
9730260e | 2330 | */ |
7972aab2 DG |
2331 | static int create_channel_per_uid(struct ust_app *app, |
2332 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2333 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2334 | { |
2335 | int ret; | |
7972aab2 DG |
2336 | struct buffer_reg_uid *reg_uid; |
2337 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2338 | |
7972aab2 DG |
2339 | assert(app); |
2340 | assert(usess); | |
2341 | assert(ua_sess); | |
2342 | assert(ua_chan); | |
2343 | ||
2344 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2345 | ||
2346 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2347 | /* | |
2348 | * The session creation handles the creation of this global registry | |
2349 | * object. If none can be find, there is a code flow problem or a | |
2350 | * teardown race. | |
2351 | */ | |
2352 | assert(reg_uid); | |
2353 | ||
2354 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2355 | reg_uid); | |
2356 | if (!reg_chan) { | |
2357 | /* Create the buffer registry channel object. */ | |
2358 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2359 | if (ret < 0) { | |
2360 | goto error; | |
2361 | } | |
2362 | assert(reg_chan); | |
2363 | ||
2364 | /* | |
2365 | * Create the buffers on the consumer side. This call populates the | |
2366 | * ust app channel object with all streams and data object. | |
2367 | */ | |
2368 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2369 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2370 | if (ret < 0) { | |
07d2ae95 DG |
2371 | /* |
2372 | * Let's remove the previously created buffer registry channel so | |
2373 | * it's not visible anymore in the session registry. | |
2374 | */ | |
2375 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2376 | ua_chan->tracing_channel_id); | |
2377 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2378 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2379 | goto error; |
2380 | } | |
2381 | ||
2382 | /* | |
2383 | * Setup the streams and add it to the session registry. | |
2384 | */ | |
2385 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2386 | if (ret < 0) { | |
2387 | goto error; | |
2388 | } | |
2389 | ||
2390 | } | |
2391 | ||
2392 | /* Send buffers to the application. */ | |
2393 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2394 | if (ret < 0) { |
2395 | goto error; | |
2396 | } | |
2397 | ||
9730260e DG |
2398 | error: |
2399 | return ret; | |
2400 | } | |
2401 | ||
78f0bacd | 2402 | /* |
7972aab2 DG |
2403 | * Create and send to the application the created buffers with per PID buffers. |
2404 | * | |
2405 | * Return 0 on success else a negative value. | |
78f0bacd | 2406 | */ |
7972aab2 DG |
2407 | static int create_channel_per_pid(struct ust_app *app, |
2408 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2409 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2410 | { |
8535a6d9 | 2411 | int ret; |
7972aab2 | 2412 | struct ust_registry_session *registry; |
78f0bacd | 2413 | |
7972aab2 DG |
2414 | assert(app); |
2415 | assert(usess); | |
2416 | assert(ua_sess); | |
2417 | assert(ua_chan); | |
2418 | ||
2419 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2420 | ||
2421 | rcu_read_lock(); | |
2422 | ||
2423 | registry = get_session_registry(ua_sess); | |
2424 | assert(registry); | |
2425 | ||
2426 | /* Create and add a new channel registry to session. */ | |
2427 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2428 | if (ret < 0) { |
2429 | goto error; | |
2430 | } | |
2431 | ||
7972aab2 DG |
2432 | /* Create and get channel on the consumer side. */ |
2433 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2434 | app->bits_per_long, registry); | |
2435 | if (ret < 0) { | |
2436 | goto error; | |
2437 | } | |
2438 | ||
2439 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2440 | if (ret < 0) { | |
2441 | goto error; | |
2442 | } | |
8535a6d9 | 2443 | |
78f0bacd | 2444 | error: |
7972aab2 | 2445 | rcu_read_unlock(); |
78f0bacd DG |
2446 | return ret; |
2447 | } | |
2448 | ||
2449 | /* | |
7972aab2 DG |
2450 | * From an already allocated ust app channel, create the channel buffers if |
2451 | * need and send it to the application. This MUST be called with a RCU read | |
2452 | * side lock acquired. | |
2453 | * | |
2454 | * Return 0 on success or else a negative value. | |
78f0bacd | 2455 | */ |
7972aab2 DG |
2456 | static int do_create_channel(struct ust_app *app, |
2457 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2458 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2459 | { |
7972aab2 | 2460 | int ret; |
78f0bacd | 2461 | |
7972aab2 DG |
2462 | assert(app); |
2463 | assert(usess); | |
2464 | assert(ua_sess); | |
2465 | assert(ua_chan); | |
2466 | ||
2467 | /* Handle buffer type before sending the channel to the application. */ | |
2468 | switch (usess->buffer_type) { | |
2469 | case LTTNG_BUFFER_PER_UID: | |
2470 | { | |
2471 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2472 | if (ret < 0) { | |
2473 | goto error; | |
2474 | } | |
2475 | break; | |
2476 | } | |
2477 | case LTTNG_BUFFER_PER_PID: | |
2478 | { | |
2479 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2480 | if (ret < 0) { | |
2481 | goto error; | |
2482 | } | |
2483 | break; | |
2484 | } | |
2485 | default: | |
2486 | assert(0); | |
2487 | ret = -EINVAL; | |
78f0bacd DG |
2488 | goto error; |
2489 | } | |
2490 | ||
7972aab2 DG |
2491 | /* Initialize ust objd object using the received handle and add it. */ |
2492 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2493 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2494 | |
7972aab2 DG |
2495 | /* If channel is not enabled, disable it on the tracer */ |
2496 | if (!ua_chan->enabled) { | |
2497 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2498 | if (ret < 0) { | |
2499 | goto error; | |
2500 | } | |
78f0bacd DG |
2501 | } |
2502 | ||
2503 | error: | |
2504 | return ret; | |
2505 | } | |
2506 | ||
284d8f55 | 2507 | /* |
4d710ac2 DG |
2508 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2509 | * newly created channel if not NULL. | |
d0b96690 | 2510 | * |
36b588ed | 2511 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2512 | * |
2513 | * Return 0 on success or else a negative value. | |
284d8f55 | 2514 | */ |
4d710ac2 DG |
2515 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2516 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2517 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2518 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2519 | { |
2520 | int ret = 0; | |
bec39940 DG |
2521 | struct lttng_ht_iter iter; |
2522 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2523 | struct ust_app_channel *ua_chan; |
2524 | ||
2525 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2526 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2527 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2528 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2529 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2530 | goto end; |
5b4a0ec0 DG |
2531 | } |
2532 | ||
d0b96690 | 2533 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2534 | if (ua_chan == NULL) { |
2535 | /* Only malloc can fail here */ | |
4d710ac2 | 2536 | ret = -ENOMEM; |
094d1690 | 2537 | goto error_alloc; |
fc34caaa DG |
2538 | } |
2539 | shadow_copy_channel(ua_chan, uchan); | |
2540 | ||
ffe60014 DG |
2541 | /* Set channel type. */ |
2542 | ua_chan->attr.type = type; | |
2543 | ||
7972aab2 | 2544 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2545 | if (ret < 0) { |
2546 | goto error; | |
2547 | } | |
2548 | ||
fc34caaa | 2549 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2550 | app->pid); |
fc34caaa | 2551 | |
d0b96690 DG |
2552 | /* Only add the channel if successful on the tracer side. */ |
2553 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2554 | ||
fc34caaa | 2555 | end: |
4d710ac2 DG |
2556 | if (ua_chanp) { |
2557 | *ua_chanp = ua_chan; | |
2558 | } | |
2559 | ||
2560 | /* Everything went well. */ | |
2561 | return 0; | |
5b4a0ec0 DG |
2562 | |
2563 | error: | |
d0b96690 | 2564 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2565 | error_alloc: |
4d710ac2 | 2566 | return ret; |
5b4a0ec0 DG |
2567 | } |
2568 | ||
2569 | /* | |
2570 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2571 | * |
2572 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2573 | */ |
edb67388 DG |
2574 | static |
2575 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2576 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2577 | struct ust_app *app) | |
284d8f55 | 2578 | { |
edb67388 | 2579 | int ret = 0; |
5b4a0ec0 | 2580 | struct ust_app_event *ua_event; |
284d8f55 | 2581 | |
5b4a0ec0 | 2582 | /* Get event node */ |
18eace3b DG |
2583 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
2584 | uevent->filter, uevent->attr.loglevel); | |
2585 | if (ua_event != NULL) { | |
fc34caaa | 2586 | ret = -EEXIST; |
edb67388 DG |
2587 | goto end; |
2588 | } | |
5b4a0ec0 | 2589 | |
edb67388 DG |
2590 | /* Does not exist so create one */ |
2591 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2592 | if (ua_event == NULL) { | |
2593 | /* Only malloc can failed so something is really wrong */ | |
2594 | ret = -ENOMEM; | |
fc34caaa | 2595 | goto end; |
5b4a0ec0 | 2596 | } |
edb67388 | 2597 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2598 | |
edb67388 | 2599 | /* Create it on the tracer side */ |
5b4a0ec0 | 2600 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2601 | if (ret < 0) { |
fc34caaa | 2602 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2603 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2604 | goto error; |
2605 | } | |
2606 | ||
d0b96690 | 2607 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2608 | |
fc34caaa | 2609 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2610 | app->pid); |
7f79d3a1 | 2611 | |
edb67388 | 2612 | end: |
fc34caaa DG |
2613 | return ret; |
2614 | ||
5b4a0ec0 | 2615 | error: |
fc34caaa DG |
2616 | /* Valid. Calling here is already in a read side lock */ |
2617 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2618 | return ret; |
5b4a0ec0 DG |
2619 | } |
2620 | ||
2621 | /* | |
2622 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2623 | * |
7972aab2 | 2624 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2625 | */ |
2626 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
d65d2de8 DG |
2627 | struct ust_app *app, struct consumer_output *consumer, |
2628 | struct ustctl_consumer_channel_attr *attr) | |
5b4a0ec0 DG |
2629 | { |
2630 | int ret = 0; | |
ffe60014 | 2631 | struct ust_app_channel *metadata; |
d88aee68 | 2632 | struct consumer_socket *socket; |
7972aab2 | 2633 | struct ust_registry_session *registry; |
5b4a0ec0 | 2634 | |
ffe60014 DG |
2635 | assert(ua_sess); |
2636 | assert(app); | |
d88aee68 | 2637 | assert(consumer); |
5b4a0ec0 | 2638 | |
7972aab2 DG |
2639 | registry = get_session_registry(ua_sess); |
2640 | assert(registry); | |
2641 | ||
1b532a60 DG |
2642 | /* Metadata already exists for this registry or it was closed previously */ |
2643 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2644 | ret = 0; |
2645 | goto error; | |
5b4a0ec0 DG |
2646 | } |
2647 | ||
ffe60014 | 2648 | /* Allocate UST metadata */ |
d0b96690 | 2649 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2650 | if (!metadata) { |
2651 | /* malloc() failed */ | |
2652 | ret = -ENOMEM; | |
2653 | goto error; | |
2654 | } | |
5b4a0ec0 | 2655 | |
d65d2de8 DG |
2656 | if (!attr) { |
2657 | /* Set default attributes for metadata. */ | |
2658 | metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
2659 | metadata->attr.subbuf_size = default_get_metadata_subbuf_size(); | |
2660 | metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
0a9c6494 DG |
2661 | metadata->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER; |
2662 | metadata->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER; | |
d65d2de8 DG |
2663 | metadata->attr.output = LTTNG_UST_MMAP; |
2664 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2665 | } else { | |
2666 | memcpy(&metadata->attr, attr, sizeof(metadata->attr)); | |
2667 | metadata->attr.output = LTTNG_UST_MMAP; | |
2668 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2669 | } | |
5b4a0ec0 | 2670 | |
7972aab2 DG |
2671 | /* Need one fd for the channel. */ |
2672 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2673 | if (ret < 0) { | |
2674 | ERR("Exhausted number of available FD upon create metadata"); | |
2675 | goto error; | |
2676 | } | |
2677 | ||
4dc3dfc5 DG |
2678 | /* Get the right consumer socket for the application. */ |
2679 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2680 | if (!socket) { | |
2681 | ret = -EINVAL; | |
2682 | goto error_consumer; | |
2683 | } | |
2684 | ||
331744e3 JD |
2685 | /* |
2686 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2687 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2688 | * consumer requesting the metadata and the ask_channel call on our side | |
2689 | * did not returned yet. | |
2690 | */ | |
2691 | registry->metadata_key = metadata->key; | |
2692 | ||
d88aee68 DG |
2693 | /* |
2694 | * Ask the metadata channel creation to the consumer. The metadata object | |
2695 | * will be created by the consumer and kept their. However, the stream is | |
2696 | * never added or monitored until we do a first push metadata to the | |
2697 | * consumer. | |
2698 | */ | |
7972aab2 DG |
2699 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2700 | registry); | |
d88aee68 | 2701 | if (ret < 0) { |
f2a444f1 DG |
2702 | /* Nullify the metadata key so we don't try to close it later on. */ |
2703 | registry->metadata_key = 0; | |
d88aee68 DG |
2704 | goto error_consumer; |
2705 | } | |
2706 | ||
2707 | /* | |
2708 | * The setup command will make the metadata stream be sent to the relayd, | |
2709 | * if applicable, and the thread managing the metadatas. This is important | |
2710 | * because after this point, if an error occurs, the only way the stream | |
2711 | * can be deleted is to be monitored in the consumer. | |
2712 | */ | |
7972aab2 | 2713 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2714 | if (ret < 0) { |
f2a444f1 DG |
2715 | /* Nullify the metadata key so we don't try to close it later on. */ |
2716 | registry->metadata_key = 0; | |
d88aee68 | 2717 | goto error_consumer; |
5b4a0ec0 DG |
2718 | } |
2719 | ||
7972aab2 DG |
2720 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2721 | metadata->key, app->pid); | |
5b4a0ec0 | 2722 | |
d88aee68 | 2723 | error_consumer: |
b80f0b6c | 2724 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2725 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2726 | error: |
ffe60014 | 2727 | return ret; |
5b4a0ec0 DG |
2728 | } |
2729 | ||
2730 | /* | |
2731 | * Return pointer to traceable apps list. | |
2732 | */ | |
bec39940 | 2733 | struct lttng_ht *ust_app_get_ht(void) |
5b4a0ec0 DG |
2734 | { |
2735 | return ust_app_ht; | |
2736 | } | |
2737 | ||
2738 | /* | |
d88aee68 DG |
2739 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2740 | * acquired before calling this function. | |
5b4a0ec0 DG |
2741 | */ |
2742 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2743 | { | |
d88aee68 | 2744 | struct ust_app *app = NULL; |
bec39940 DG |
2745 | struct lttng_ht_node_ulong *node; |
2746 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2747 | |
bec39940 DG |
2748 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2749 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2750 | if (node == NULL) { |
2751 | DBG2("UST app no found with pid %d", pid); | |
2752 | goto error; | |
2753 | } | |
5b4a0ec0 DG |
2754 | |
2755 | DBG2("Found UST app by pid %d", pid); | |
2756 | ||
d88aee68 | 2757 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2758 | |
2759 | error: | |
d88aee68 | 2760 | return app; |
5b4a0ec0 DG |
2761 | } |
2762 | ||
d88aee68 DG |
2763 | /* |
2764 | * Allocate and init an UST app object using the registration information and | |
2765 | * the command socket. This is called when the command socket connects to the | |
2766 | * session daemon. | |
2767 | * | |
2768 | * The object is returned on success or else NULL. | |
2769 | */ | |
d0b96690 | 2770 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2771 | { |
d0b96690 DG |
2772 | struct ust_app *lta = NULL; |
2773 | ||
2774 | assert(msg); | |
2775 | assert(sock >= 0); | |
2776 | ||
2777 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2778 | |
173af62f DG |
2779 | if ((msg->bits_per_long == 64 && |
2780 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2781 | || (msg->bits_per_long == 32 && | |
2782 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2783 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2784 | "%d-bit long, but no consumerd for this size is available.\n", |
2785 | msg->name, msg->pid, msg->bits_per_long); | |
2786 | goto error; | |
3f2c5fcc | 2787 | } |
d0b96690 | 2788 | |
5b4a0ec0 DG |
2789 | lta = zmalloc(sizeof(struct ust_app)); |
2790 | if (lta == NULL) { | |
2791 | PERROR("malloc"); | |
d0b96690 | 2792 | goto error; |
5b4a0ec0 DG |
2793 | } |
2794 | ||
2795 | lta->ppid = msg->ppid; | |
2796 | lta->uid = msg->uid; | |
2797 | lta->gid = msg->gid; | |
d0b96690 | 2798 | |
7753dea8 | 2799 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2800 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2801 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2802 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2803 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2804 | lta->long_alignment = msg->long_alignment; | |
2805 | lta->byte_order = msg->byte_order; | |
2806 | ||
5b4a0ec0 DG |
2807 | lta->v_major = msg->major; |
2808 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 2809 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
2810 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2811 | lta->notify_sock = -1; | |
d88aee68 DG |
2812 | |
2813 | /* Copy name and make sure it's NULL terminated. */ | |
2814 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2815 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2816 | ||
2817 | /* | |
2818 | * Before this can be called, when receiving the registration information, | |
2819 | * the application compatibility is checked. So, at this point, the | |
2820 | * application can work with this session daemon. | |
2821 | */ | |
d0b96690 | 2822 | lta->compatible = 1; |
5b4a0ec0 | 2823 | |
852d0037 | 2824 | lta->pid = msg->pid; |
d0b96690 | 2825 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2826 | lta->sock = sock; |
d0b96690 | 2827 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2828 | |
d42f20df DG |
2829 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2830 | ||
d0b96690 DG |
2831 | error: |
2832 | return lta; | |
2833 | } | |
2834 | ||
d88aee68 DG |
2835 | /* |
2836 | * For a given application object, add it to every hash table. | |
2837 | */ | |
d0b96690 DG |
2838 | void ust_app_add(struct ust_app *app) |
2839 | { | |
2840 | assert(app); | |
2841 | assert(app->notify_sock >= 0); | |
2842 | ||
5b4a0ec0 | 2843 | rcu_read_lock(); |
852d0037 DG |
2844 | |
2845 | /* | |
2846 | * On a re-registration, we want to kick out the previous registration of | |
2847 | * that pid | |
2848 | */ | |
d0b96690 | 2849 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
2850 | |
2851 | /* | |
2852 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
2853 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
2854 | * already in the table. | |
2855 | */ | |
d0b96690 | 2856 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 2857 | |
d0b96690 DG |
2858 | /* Add application to the notify socket hash table. */ |
2859 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
2860 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 2861 | |
d0b96690 | 2862 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
2863 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
2864 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
2865 | app->v_minor); | |
5b4a0ec0 | 2866 | |
d0b96690 DG |
2867 | rcu_read_unlock(); |
2868 | } | |
2869 | ||
d88aee68 DG |
2870 | /* |
2871 | * Set the application version into the object. | |
2872 | * | |
2873 | * Return 0 on success else a negative value either an errno code or a | |
2874 | * LTTng-UST error code. | |
2875 | */ | |
d0b96690 DG |
2876 | int ust_app_version(struct ust_app *app) |
2877 | { | |
d88aee68 DG |
2878 | int ret; |
2879 | ||
d0b96690 | 2880 | assert(app); |
d88aee68 DG |
2881 | |
2882 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2883 | if (ret < 0) { | |
2884 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2885 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2886 | } else { | |
2887 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2888 | } | |
2889 | } | |
2890 | ||
2891 | return ret; | |
5b4a0ec0 DG |
2892 | } |
2893 | ||
2894 | /* | |
2895 | * Unregister app by removing it from the global traceable app list and freeing | |
2896 | * the data struct. | |
2897 | * | |
2898 | * The socket is already closed at this point so no close to sock. | |
2899 | */ | |
2900 | void ust_app_unregister(int sock) | |
2901 | { | |
2902 | struct ust_app *lta; | |
bec39940 DG |
2903 | struct lttng_ht_node_ulong *node; |
2904 | struct lttng_ht_iter iter; | |
d42f20df | 2905 | struct ust_app_session *ua_sess; |
525b0740 | 2906 | int ret; |
5b4a0ec0 DG |
2907 | |
2908 | rcu_read_lock(); | |
886459c6 | 2909 | |
5b4a0ec0 | 2910 | /* Get the node reference for a call_rcu */ |
852d0037 | 2911 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 2912 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 2913 | assert(node); |
284d8f55 | 2914 | |
852d0037 | 2915 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
2916 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
2917 | ||
886459c6 | 2918 | /* Remove application from PID hash table */ |
852d0037 DG |
2919 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
2920 | assert(!ret); | |
2921 | ||
d88aee68 DG |
2922 | /* |
2923 | * Remove application from notify hash table. The thread handling the | |
2924 | * notify socket could have deleted the node so ignore on error because | |
2925 | * either way it's valid. The close of that socket is handled by the other | |
2926 | * thread. | |
2927 | */ | |
d0b96690 | 2928 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 2929 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 2930 | |
5b98a774 DG |
2931 | /* |
2932 | * Ignore return value since the node might have been removed before by an | |
2933 | * add replace during app registration because the PID can be reassigned by | |
2934 | * the OS. | |
2935 | */ | |
d0b96690 | 2936 | iter.iter.node = <a->pid_n.node; |
bec39940 | 2937 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
2938 | if (ret) { |
2939 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
2940 | lta->pid); | |
2941 | } | |
852d0037 | 2942 | |
d42f20df DG |
2943 | /* Remove sessions so they are not visible during deletion.*/ |
2944 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
2945 | node.node) { | |
7972aab2 DG |
2946 | struct ust_registry_session *registry; |
2947 | ||
d42f20df DG |
2948 | ret = lttng_ht_del(lta->sessions, &iter); |
2949 | if (ret) { | |
2950 | /* The session was already removed so scheduled for teardown. */ | |
2951 | continue; | |
2952 | } | |
2953 | ||
2954 | /* | |
2955 | * Add session to list for teardown. This is safe since at this point we | |
2956 | * are the only one using this list. | |
2957 | */ | |
d88aee68 DG |
2958 | pthread_mutex_lock(&ua_sess->lock); |
2959 | ||
2960 | /* | |
2961 | * Normally, this is done in the delete session process which is | |
2962 | * executed in the call rcu below. However, upon registration we can't | |
2963 | * afford to wait for the grace period before pushing data or else the | |
2964 | * data pending feature can race between the unregistration and stop | |
2965 | * command where the data pending command is sent *before* the grace | |
2966 | * period ended. | |
2967 | * | |
2968 | * The close metadata below nullifies the metadata pointer in the | |
2969 | * session so the delete session will NOT push/close a second time. | |
2970 | */ | |
7972aab2 | 2971 | registry = get_session_registry(ua_sess); |
1b532a60 | 2972 | if (registry && !registry->metadata_closed) { |
7972aab2 DG |
2973 | /* Push metadata for application before freeing the application. */ |
2974 | (void) push_metadata(registry, ua_sess->consumer); | |
2975 | ||
2976 | /* | |
2977 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
2978 | * metadata only on destroy trace session in this case. Also, the |
2979 | * previous push metadata could have flag the metadata registry to | |
2980 | * close so don't send a close command if closed. | |
7972aab2 | 2981 | */ |
1b532a60 DG |
2982 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
2983 | !registry->metadata_closed) { | |
7972aab2 DG |
2984 | /* And ask to close it for this session registry. */ |
2985 | (void) close_metadata(registry, ua_sess->consumer); | |
2986 | } | |
2987 | } | |
d88aee68 | 2988 | |
d42f20df | 2989 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 2990 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
2991 | } |
2992 | ||
852d0037 DG |
2993 | /* Free memory */ |
2994 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
2995 | ||
5b4a0ec0 DG |
2996 | rcu_read_unlock(); |
2997 | return; | |
284d8f55 DG |
2998 | } |
2999 | ||
3000 | /* | |
5b4a0ec0 | 3001 | * Return traceable_app_count |
284d8f55 | 3002 | */ |
5b4a0ec0 | 3003 | unsigned long ust_app_list_count(void) |
284d8f55 | 3004 | { |
5b4a0ec0 | 3005 | unsigned long count; |
284d8f55 | 3006 | |
5b4a0ec0 | 3007 | rcu_read_lock(); |
bec39940 | 3008 | count = lttng_ht_get_count(ust_app_ht); |
5b4a0ec0 | 3009 | rcu_read_unlock(); |
284d8f55 | 3010 | |
5b4a0ec0 | 3011 | return count; |
284d8f55 DG |
3012 | } |
3013 | ||
5b4a0ec0 DG |
3014 | /* |
3015 | * Fill events array with all events name of all registered apps. | |
3016 | */ | |
3017 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3018 | { |
5b4a0ec0 DG |
3019 | int ret, handle; |
3020 | size_t nbmem, count = 0; | |
bec39940 | 3021 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3022 | struct ust_app *app; |
c617c0c6 | 3023 | struct lttng_event *tmp_event; |
421cb601 | 3024 | |
5b4a0ec0 | 3025 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3026 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3027 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3028 | PERROR("zmalloc ust app events"); |
3029 | ret = -ENOMEM; | |
421cb601 DG |
3030 | goto error; |
3031 | } | |
3032 | ||
5b4a0ec0 | 3033 | rcu_read_lock(); |
421cb601 | 3034 | |
852d0037 | 3035 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3036 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3037 | |
840cb59c | 3038 | health_code_update(); |
86acf0da | 3039 | |
e0c7ec2b DG |
3040 | if (!app->compatible) { |
3041 | /* | |
3042 | * TODO: In time, we should notice the caller of this error by | |
3043 | * telling him that this is a version error. | |
3044 | */ | |
3045 | continue; | |
3046 | } | |
852d0037 | 3047 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3048 | if (handle < 0) { |
ffe60014 DG |
3049 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3050 | ERR("UST app list events getting handle failed for app pid %d", | |
3051 | app->pid); | |
3052 | } | |
5b4a0ec0 DG |
3053 | continue; |
3054 | } | |
421cb601 | 3055 | |
852d0037 | 3056 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3057 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3058 | /* Handle ustctl error. */ |
3059 | if (ret < 0) { | |
3060 | free(tmp_event); | |
3061 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3062 | ERR("UST app tp list get failed for app %d with ret %d", | |
3063 | app->sock, ret); | |
3064 | } else { | |
3065 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3066 | /* |
3067 | * This is normal behavior, an application can die during the | |
3068 | * creation process. Don't report an error so the execution can | |
3069 | * continue normally. Continue normal execution. | |
3070 | */ | |
3071 | break; | |
ffe60014 DG |
3072 | } |
3073 | goto rcu_error; | |
3074 | } | |
3075 | ||
840cb59c | 3076 | health_code_update(); |
815564d8 | 3077 | if (count >= nbmem) { |
d7b3776f | 3078 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3079 | void *ptr; |
3080 | ||
815564d8 MD |
3081 | DBG2("Reallocating event list from %zu to %zu entries", nbmem, |
3082 | 2 * nbmem); | |
3083 | nbmem *= 2; | |
c617c0c6 MD |
3084 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event)); |
3085 | if (ptr == NULL) { | |
5b4a0ec0 | 3086 | PERROR("realloc ust app events"); |
c617c0c6 | 3087 | free(tmp_event); |
5b4a0ec0 DG |
3088 | ret = -ENOMEM; |
3089 | goto rcu_error; | |
3090 | } | |
c617c0c6 | 3091 | tmp_event = ptr; |
5b4a0ec0 | 3092 | } |
c617c0c6 MD |
3093 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3094 | tmp_event[count].loglevel = uiter.loglevel; | |
3095 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3096 | tmp_event[count].pid = app->pid; | |
3097 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3098 | count++; |
421cb601 | 3099 | } |
421cb601 DG |
3100 | } |
3101 | ||
5b4a0ec0 | 3102 | ret = count; |
c617c0c6 | 3103 | *events = tmp_event; |
421cb601 | 3104 | |
5b4a0ec0 | 3105 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3106 | |
5b4a0ec0 DG |
3107 | rcu_error: |
3108 | rcu_read_unlock(); | |
421cb601 | 3109 | error: |
840cb59c | 3110 | health_code_update(); |
5b4a0ec0 | 3111 | return ret; |
421cb601 DG |
3112 | } |
3113 | ||
f37d259d MD |
3114 | /* |
3115 | * Fill events array with all events name of all registered apps. | |
3116 | */ | |
3117 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3118 | { | |
3119 | int ret, handle; | |
3120 | size_t nbmem, count = 0; | |
3121 | struct lttng_ht_iter iter; | |
3122 | struct ust_app *app; | |
c617c0c6 | 3123 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3124 | |
3125 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3126 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3127 | if (tmp_event == NULL) { | |
f37d259d MD |
3128 | PERROR("zmalloc ust app event fields"); |
3129 | ret = -ENOMEM; | |
3130 | goto error; | |
3131 | } | |
3132 | ||
3133 | rcu_read_lock(); | |
3134 | ||
3135 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3136 | struct lttng_ust_field_iter uiter; | |
3137 | ||
840cb59c | 3138 | health_code_update(); |
86acf0da | 3139 | |
f37d259d MD |
3140 | if (!app->compatible) { |
3141 | /* | |
3142 | * TODO: In time, we should notice the caller of this error by | |
3143 | * telling him that this is a version error. | |
3144 | */ | |
3145 | continue; | |
3146 | } | |
3147 | handle = ustctl_tracepoint_field_list(app->sock); | |
3148 | if (handle < 0) { | |
ffe60014 DG |
3149 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3150 | ERR("UST app list field getting handle failed for app pid %d", | |
3151 | app->pid); | |
3152 | } | |
f37d259d MD |
3153 | continue; |
3154 | } | |
3155 | ||
3156 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3157 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3158 | /* Handle ustctl error. */ |
3159 | if (ret < 0) { | |
3160 | free(tmp_event); | |
3161 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3162 | ERR("UST app tp list field failed for app %d with ret %d", | |
3163 | app->sock, ret); | |
3164 | } else { | |
3165 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3166 | /* |
3167 | * This is normal behavior, an application can die during the | |
3168 | * creation process. Don't report an error so the execution can | |
3169 | * continue normally. | |
3170 | */ | |
3171 | break; | |
ffe60014 DG |
3172 | } |
3173 | goto rcu_error; | |
3174 | } | |
3175 | ||
840cb59c | 3176 | health_code_update(); |
f37d259d | 3177 | if (count >= nbmem) { |
d7b3776f | 3178 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3179 | void *ptr; |
3180 | ||
f37d259d MD |
3181 | DBG2("Reallocating event field list from %zu to %zu entries", nbmem, |
3182 | 2 * nbmem); | |
3183 | nbmem *= 2; | |
c617c0c6 MD |
3184 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field)); |
3185 | if (ptr == NULL) { | |
f37d259d | 3186 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3187 | free(tmp_event); |
f37d259d MD |
3188 | ret = -ENOMEM; |
3189 | goto rcu_error; | |
3190 | } | |
c617c0c6 | 3191 | tmp_event = ptr; |
f37d259d | 3192 | } |
f37d259d | 3193 | |
c617c0c6 | 3194 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
72b6f5b6 DG |
3195 | /* Mapping between these enums matches 1 to 1. */ |
3196 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3197 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3198 | |
c617c0c6 MD |
3199 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3200 | tmp_event[count].event.loglevel = uiter.loglevel; | |
72b6f5b6 | 3201 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3202 | tmp_event[count].event.pid = app->pid; |
3203 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3204 | count++; |
3205 | } | |
3206 | } | |
3207 | ||
3208 | ret = count; | |
c617c0c6 | 3209 | *fields = tmp_event; |
f37d259d MD |
3210 | |
3211 | DBG2("UST app list event fields done (%zu events)", count); | |
3212 | ||
3213 | rcu_error: | |
3214 | rcu_read_unlock(); | |
3215 | error: | |
840cb59c | 3216 | health_code_update(); |
f37d259d MD |
3217 | return ret; |
3218 | } | |
3219 | ||
5b4a0ec0 DG |
3220 | /* |
3221 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3222 | * |
3223 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3224 | */ |
3225 | void ust_app_clean_list(void) | |
421cb601 | 3226 | { |
5b4a0ec0 | 3227 | int ret; |
659ed79f | 3228 | struct ust_app *app; |
bec39940 | 3229 | struct lttng_ht_iter iter; |
421cb601 | 3230 | |
5b4a0ec0 | 3231 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3232 | |
5b4a0ec0 | 3233 | rcu_read_lock(); |
421cb601 | 3234 | |
659ed79f | 3235 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3236 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3237 | assert(!ret); |
659ed79f | 3238 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3239 | } |
3240 | ||
852d0037 | 3241 | /* Cleanup socket hash table */ |
659ed79f DG |
3242 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3243 | sock_n.node) { | |
852d0037 | 3244 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3245 | assert(!ret); |
3246 | } | |
852d0037 | 3247 | |
d88aee68 DG |
3248 | /* Cleanup notify socket hash table */ |
3249 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3250 | notify_sock_n.node) { | |
3251 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3252 | assert(!ret); | |
3253 | } | |
36b588ed | 3254 | rcu_read_unlock(); |
d88aee68 | 3255 | |
bec39940 | 3256 | /* Destroy is done only when the ht is empty */ |
0b2dc8df MD |
3257 | ht_cleanup_push(ust_app_ht); |
3258 | ht_cleanup_push(ust_app_ht_by_sock); | |
3259 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
5b4a0ec0 DG |
3260 | } |
3261 | ||
3262 | /* | |
3263 | * Init UST app hash table. | |
3264 | */ | |
3265 | void ust_app_ht_alloc(void) | |
3266 | { | |
bec39940 | 3267 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3268 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3269 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3270 | } |
3271 | ||
78f0bacd DG |
3272 | /* |
3273 | * For a specific UST session, disable the channel for all registered apps. | |
3274 | */ | |
35a9059d | 3275 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3276 | struct ltt_ust_channel *uchan) |
3277 | { | |
3278 | int ret = 0; | |
bec39940 DG |
3279 | struct lttng_ht_iter iter; |
3280 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3281 | struct ust_app *app; |
3282 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3283 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3284 | |
3285 | if (usess == NULL || uchan == NULL) { | |
3286 | ERR("Disabling UST global channel with NULL values"); | |
3287 | ret = -1; | |
3288 | goto error; | |
3289 | } | |
3290 | ||
d9bf3ca4 | 3291 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3292 | uchan->name, usess->id); |
78f0bacd DG |
3293 | |
3294 | rcu_read_lock(); | |
3295 | ||
3296 | /* For every registered applications */ | |
852d0037 | 3297 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3298 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3299 | if (!app->compatible) { |
3300 | /* | |
3301 | * TODO: In time, we should notice the caller of this error by | |
3302 | * telling him that this is a version error. | |
3303 | */ | |
3304 | continue; | |
3305 | } | |
78f0bacd DG |
3306 | ua_sess = lookup_session_by_app(usess, app); |
3307 | if (ua_sess == NULL) { | |
3308 | continue; | |
3309 | } | |
3310 | ||
8535a6d9 | 3311 | /* Get channel */ |
bec39940 DG |
3312 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3313 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3314 | /* If the session if found for the app, the channel must be there */ |
3315 | assert(ua_chan_node); | |
3316 | ||
3317 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3318 | /* The channel must not be already disabled */ | |
3319 | assert(ua_chan->enabled == 1); | |
3320 | ||
3321 | /* Disable channel onto application */ | |
3322 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3323 | if (ret < 0) { |
3324 | /* XXX: We might want to report this error at some point... */ | |
3325 | continue; | |
3326 | } | |
3327 | } | |
3328 | ||
3329 | rcu_read_unlock(); | |
3330 | ||
3331 | error: | |
3332 | return ret; | |
3333 | } | |
3334 | ||
3335 | /* | |
3336 | * For a specific UST session, enable the channel for all registered apps. | |
3337 | */ | |
35a9059d | 3338 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3339 | struct ltt_ust_channel *uchan) |
3340 | { | |
3341 | int ret = 0; | |
bec39940 | 3342 | struct lttng_ht_iter iter; |
78f0bacd DG |
3343 | struct ust_app *app; |
3344 | struct ust_app_session *ua_sess; | |
3345 | ||
3346 | if (usess == NULL || uchan == NULL) { | |
3347 | ERR("Adding UST global channel to NULL values"); | |
3348 | ret = -1; | |
3349 | goto error; | |
3350 | } | |
3351 | ||
d9bf3ca4 | 3352 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3353 | uchan->name, usess->id); |
78f0bacd DG |
3354 | |
3355 | rcu_read_lock(); | |
3356 | ||
3357 | /* For every registered applications */ | |
852d0037 | 3358 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3359 | if (!app->compatible) { |
3360 | /* | |
3361 | * TODO: In time, we should notice the caller of this error by | |
3362 | * telling him that this is a version error. | |
3363 | */ | |
3364 | continue; | |
3365 | } | |
78f0bacd DG |
3366 | ua_sess = lookup_session_by_app(usess, app); |
3367 | if (ua_sess == NULL) { | |
3368 | continue; | |
3369 | } | |
3370 | ||
3371 | /* Enable channel onto application */ | |
3372 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3373 | if (ret < 0) { | |
3374 | /* XXX: We might want to report this error at some point... */ | |
3375 | continue; | |
3376 | } | |
3377 | } | |
3378 | ||
3379 | rcu_read_unlock(); | |
3380 | ||
3381 | error: | |
3382 | return ret; | |
3383 | } | |
3384 | ||
b0a40d28 DG |
3385 | /* |
3386 | * Disable an event in a channel and for a specific session. | |
3387 | */ | |
35a9059d DG |
3388 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3389 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3390 | { |
3391 | int ret = 0; | |
bec39940 DG |
3392 | struct lttng_ht_iter iter, uiter; |
3393 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3394 | struct ust_app *app; |
3395 | struct ust_app_session *ua_sess; | |
3396 | struct ust_app_channel *ua_chan; | |
3397 | struct ust_app_event *ua_event; | |
3398 | ||
3399 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3400 | "%s for session id %" PRIu64, |
3401 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3402 | |
3403 | rcu_read_lock(); | |
3404 | ||
3405 | /* For all registered applications */ | |
852d0037 | 3406 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3407 | if (!app->compatible) { |
3408 | /* | |
3409 | * TODO: In time, we should notice the caller of this error by | |
3410 | * telling him that this is a version error. | |
3411 | */ | |
3412 | continue; | |
3413 | } | |
b0a40d28 DG |
3414 | ua_sess = lookup_session_by_app(usess, app); |
3415 | if (ua_sess == NULL) { | |
3416 | /* Next app */ | |
3417 | continue; | |
3418 | } | |
3419 | ||
3420 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3421 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3422 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3423 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3424 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3425 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3426 | continue; |
3427 | } | |
3428 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3429 | ||
bec39940 DG |
3430 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3431 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3432 | if (ua_event_node == NULL) { |
3433 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3434 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3435 | continue; |
3436 | } | |
3437 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3438 | ||
7f79d3a1 | 3439 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3440 | if (ret < 0) { |
3441 | /* XXX: Report error someday... */ | |
3442 | continue; | |
3443 | } | |
3444 | } | |
3445 | ||
3446 | rcu_read_unlock(); | |
3447 | ||
3448 | return ret; | |
3449 | } | |
3450 | ||
9730260e | 3451 | /* |
edb67388 | 3452 | * For a specific UST session and UST channel, the event for all |
9730260e DG |
3453 | * registered apps. |
3454 | */ | |
35a9059d | 3455 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
9730260e DG |
3456 | struct ltt_ust_channel *uchan) |
3457 | { | |
3458 | int ret = 0; | |
bec39940 DG |
3459 | struct lttng_ht_iter iter, uiter; |
3460 | struct lttng_ht_node_str *ua_chan_node; | |
9730260e DG |
3461 | struct ust_app *app; |
3462 | struct ust_app_session *ua_sess; | |
3463 | struct ust_app_channel *ua_chan; | |
3464 | struct ust_app_event *ua_event; | |
3465 | ||
3466 | DBG("UST app disabling all event for all apps in channel " | |
d9bf3ca4 | 3467 | "%s for session id %" PRIu64, uchan->name, usess->id); |
9730260e DG |
3468 | |
3469 | rcu_read_lock(); | |
3470 | ||
3471 | /* For all registered applications */ | |
852d0037 | 3472 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3473 | if (!app->compatible) { |
3474 | /* | |
3475 | * TODO: In time, we should notice the caller of this error by | |
3476 | * telling him that this is a version error. | |
3477 | */ | |
3478 | continue; | |
3479 | } | |
9730260e | 3480 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3481 | if (!ua_sess) { |
3482 | /* The application has problem or is probably dead. */ | |
3483 | continue; | |
3484 | } | |
9730260e DG |
3485 | |
3486 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3487 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3488 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3489 | /* If the channel is not found, there is a code flow error */ |
3490 | assert(ua_chan_node); | |
3491 | ||
9730260e DG |
3492 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3493 | ||
3494 | /* Disable each events of channel */ | |
bec39940 DG |
3495 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3496 | node.node) { | |
7f79d3a1 | 3497 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
9730260e DG |
3498 | if (ret < 0) { |
3499 | /* XXX: Report error someday... */ | |
3500 | continue; | |
3501 | } | |
3502 | } | |
3503 | } | |
3504 | ||
3505 | rcu_read_unlock(); | |
3506 | ||
3507 | return ret; | |
3508 | } | |
3509 | ||
421cb601 | 3510 | /* |
5b4a0ec0 | 3511 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3512 | */ |
35a9059d | 3513 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3514 | struct ltt_ust_channel *uchan) |
3515 | { | |
3d8ca23b | 3516 | int ret = 0, created; |
bec39940 | 3517 | struct lttng_ht_iter iter; |
48842b30 | 3518 | struct ust_app *app; |
3d8ca23b | 3519 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3520 | |
fc34caaa DG |
3521 | /* Very wrong code flow */ |
3522 | assert(usess); | |
3523 | assert(uchan); | |
421cb601 | 3524 | |
d9bf3ca4 | 3525 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3526 | uchan->name, usess->id); |
48842b30 DG |
3527 | |
3528 | rcu_read_lock(); | |
421cb601 | 3529 | |
5b4a0ec0 | 3530 | /* For every registered applications */ |
852d0037 | 3531 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3532 | if (!app->compatible) { |
3533 | /* | |
3534 | * TODO: In time, we should notice the caller of this error by | |
3535 | * telling him that this is a version error. | |
3536 | */ | |
3537 | continue; | |
3538 | } | |
edb67388 DG |
3539 | /* |
3540 | * Create session on the tracer side and add it to app session HT. Note | |
3541 | * that if session exist, it will simply return a pointer to the ust | |
3542 | * app session. | |
3543 | */ | |
3d8ca23b DG |
3544 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3545 | if (ret < 0) { | |
3546 | switch (ret) { | |
3547 | case -ENOTCONN: | |
3548 | /* | |
3549 | * The application's socket is not valid. Either a bad socket | |
3550 | * or a timeout on it. We can't inform the caller that for a | |
3551 | * specific app, the session failed so lets continue here. | |
3552 | */ | |
3553 | continue; | |
3554 | case -ENOMEM: | |
3555 | default: | |
3556 | goto error_rcu_unlock; | |
3557 | } | |
48842b30 | 3558 | } |
3d8ca23b | 3559 | assert(ua_sess); |
48842b30 | 3560 | |
d0b96690 | 3561 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3562 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3563 | sizeof(uchan->name))) { | |
3564 | struct ustctl_consumer_channel_attr attr; | |
3565 | copy_channel_attr_to_ustctl(&attr, &uchan->attr); | |
3566 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
3567 | &attr); | |
3568 | } else { | |
3569 | /* Create channel onto application. We don't need the chan ref. */ | |
3570 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3571 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3572 | } | |
d0b96690 | 3573 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3574 | if (ret < 0) { |
3575 | if (ret == -ENOMEM) { | |
3576 | /* No more memory is a fatal error. Stop right now. */ | |
3577 | goto error_rcu_unlock; | |
3578 | } | |
3579 | /* Cleanup the created session if it's the case. */ | |
3580 | if (created) { | |
d0b96690 | 3581 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3582 | } |
48842b30 | 3583 | } |
48842b30 | 3584 | } |
5b4a0ec0 | 3585 | |
95e047ff | 3586 | error_rcu_unlock: |
48842b30 | 3587 | rcu_read_unlock(); |
3c14c33f | 3588 | return ret; |
48842b30 DG |
3589 | } |
3590 | ||
5b4a0ec0 | 3591 | /* |
edb67388 | 3592 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3593 | */ |
35a9059d | 3594 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3595 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3596 | { | |
3597 | int ret = 0; | |
bec39940 | 3598 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3599 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3600 | struct ust_app *app; |
3601 | struct ust_app_session *ua_sess; | |
3602 | struct ust_app_channel *ua_chan; | |
3603 | struct ust_app_event *ua_event; | |
48842b30 | 3604 | |
d9bf3ca4 | 3605 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3606 | uevent->attr.name, usess->id); |
48842b30 | 3607 | |
edb67388 DG |
3608 | /* |
3609 | * NOTE: At this point, this function is called only if the session and | |
3610 | * channel passed are already created for all apps. and enabled on the | |
3611 | * tracer also. | |
3612 | */ | |
3613 | ||
48842b30 | 3614 | rcu_read_lock(); |
421cb601 DG |
3615 | |
3616 | /* For all registered applications */ | |
852d0037 | 3617 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3618 | if (!app->compatible) { |
3619 | /* | |
3620 | * TODO: In time, we should notice the caller of this error by | |
3621 | * telling him that this is a version error. | |
3622 | */ | |
3623 | continue; | |
3624 | } | |
edb67388 | 3625 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3626 | if (!ua_sess) { |
3627 | /* The application has problem or is probably dead. */ | |
3628 | continue; | |
3629 | } | |
ba767faf | 3630 | |
d0b96690 DG |
3631 | pthread_mutex_lock(&ua_sess->lock); |
3632 | ||
edb67388 | 3633 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3634 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3635 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3636 | /* If the channel is not found, there is a code flow error */ |
3637 | assert(ua_chan_node); | |
3638 | ||
3639 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3640 | ||
18eace3b DG |
3641 | /* Get event node */ |
3642 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
3643 | uevent->filter, uevent->attr.loglevel); | |
3644 | if (ua_event == NULL) { | |
7f79d3a1 | 3645 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3646 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3647 | goto next_app; |
35a9059d | 3648 | } |
35a9059d DG |
3649 | |
3650 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3651 | if (ret < 0) { | |
d0b96690 | 3652 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3653 | goto error; |
48842b30 | 3654 | } |
d0b96690 DG |
3655 | next_app: |
3656 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3657 | } |
3658 | ||
7f79d3a1 | 3659 | error: |
edb67388 | 3660 | rcu_read_unlock(); |
edb67388 DG |
3661 | return ret; |
3662 | } | |
3663 | ||
3664 | /* | |
3665 | * For a specific existing UST session and UST channel, creates the event for | |
3666 | * all registered apps. | |
3667 | */ | |
35a9059d | 3668 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3669 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3670 | { | |
3671 | int ret = 0; | |
bec39940 DG |
3672 | struct lttng_ht_iter iter, uiter; |
3673 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3674 | struct ust_app *app; |
3675 | struct ust_app_session *ua_sess; | |
3676 | struct ust_app_channel *ua_chan; | |
3677 | ||
d9bf3ca4 | 3678 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3679 | uevent->attr.name, usess->id); |
edb67388 | 3680 | |
edb67388 DG |
3681 | rcu_read_lock(); |
3682 | ||
3683 | /* For all registered applications */ | |
852d0037 | 3684 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3685 | if (!app->compatible) { |
3686 | /* | |
3687 | * TODO: In time, we should notice the caller of this error by | |
3688 | * telling him that this is a version error. | |
3689 | */ | |
3690 | continue; | |
3691 | } | |
edb67388 | 3692 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3693 | if (!ua_sess) { |
3694 | /* The application has problem or is probably dead. */ | |
3695 | continue; | |
3696 | } | |
48842b30 | 3697 | |
d0b96690 | 3698 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3699 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3700 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3701 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3702 | /* If the channel is not found, there is a code flow error */ |
3703 | assert(ua_chan_node); | |
3704 | ||
48842b30 DG |
3705 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3706 | ||
edb67388 | 3707 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3708 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3709 | if (ret < 0) { |
49c336c1 | 3710 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3711 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3712 | break; | |
3713 | } | |
3714 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3715 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3716 | continue; |
48842b30 | 3717 | } |
48842b30 | 3718 | } |
5b4a0ec0 | 3719 | |
48842b30 DG |
3720 | rcu_read_unlock(); |
3721 | ||
3722 | return ret; | |
3723 | } | |
3724 | ||
5b4a0ec0 DG |
3725 | /* |
3726 | * Start tracing for a specific UST session and app. | |
3727 | */ | |
b34cbebf | 3728 | static |
421cb601 | 3729 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3730 | { |
3731 | int ret = 0; | |
48842b30 | 3732 | struct ust_app_session *ua_sess; |
48842b30 | 3733 | |
852d0037 | 3734 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3735 | |
509cbaf8 MD |
3736 | rcu_read_lock(); |
3737 | ||
e0c7ec2b DG |
3738 | if (!app->compatible) { |
3739 | goto end; | |
3740 | } | |
3741 | ||
421cb601 DG |
3742 | ua_sess = lookup_session_by_app(usess, app); |
3743 | if (ua_sess == NULL) { | |
d42f20df DG |
3744 | /* The session is in teardown process. Ignore and continue. */ |
3745 | goto end; | |
421cb601 | 3746 | } |
48842b30 | 3747 | |
d0b96690 DG |
3748 | pthread_mutex_lock(&ua_sess->lock); |
3749 | ||
aea829b3 DG |
3750 | /* Upon restart, we skip the setup, already done */ |
3751 | if (ua_sess->started) { | |
8be98f9a | 3752 | goto skip_setup; |
aea829b3 | 3753 | } |
8be98f9a | 3754 | |
a4b92340 DG |
3755 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3756 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3757 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3758 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3759 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3760 | if (ret < 0) { |
3761 | if (ret != -EEXIST) { | |
3762 | ERR("Trace directory creation error"); | |
d0b96690 | 3763 | goto error_unlock; |
421cb601 | 3764 | } |
173af62f | 3765 | } |
7753dea8 | 3766 | } |
aea829b3 | 3767 | |
d65d2de8 DG |
3768 | /* |
3769 | * Create the metadata for the application. This returns gracefully if a | |
3770 | * metadata was already set for the session. | |
3771 | */ | |
3772 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, NULL); | |
421cb601 | 3773 | if (ret < 0) { |
d0b96690 | 3774 | goto error_unlock; |
421cb601 | 3775 | } |
48842b30 | 3776 | |
840cb59c | 3777 | health_code_update(); |
86acf0da | 3778 | |
8be98f9a | 3779 | skip_setup: |
421cb601 | 3780 | /* This start the UST tracing */ |
852d0037 | 3781 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3782 | if (ret < 0) { |
ffe60014 DG |
3783 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3784 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3785 | app->pid, ret); | |
3786 | } else { | |
3787 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
3788 | /* |
3789 | * This is normal behavior, an application can die during the | |
3790 | * creation process. Don't report an error so the execution can | |
3791 | * continue normally. | |
3792 | */ | |
3793 | pthread_mutex_unlock(&ua_sess->lock); | |
3794 | goto end; | |
ffe60014 | 3795 | } |
d0b96690 | 3796 | goto error_unlock; |
421cb601 | 3797 | } |
5b4a0ec0 | 3798 | |
55c3953d DG |
3799 | /* Indicate that the session has been started once */ |
3800 | ua_sess->started = 1; | |
3801 | ||
d0b96690 DG |
3802 | pthread_mutex_unlock(&ua_sess->lock); |
3803 | ||
840cb59c | 3804 | health_code_update(); |
86acf0da | 3805 | |
421cb601 | 3806 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3807 | ret = ustctl_wait_quiescent(app->sock); |
3808 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3809 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3810 | app->pid, ret); | |
3811 | } | |
48842b30 | 3812 | |
e0c7ec2b DG |
3813 | end: |
3814 | rcu_read_unlock(); | |
840cb59c | 3815 | health_code_update(); |
421cb601 | 3816 | return 0; |
48842b30 | 3817 | |
d0b96690 DG |
3818 | error_unlock: |
3819 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3820 | rcu_read_unlock(); |
840cb59c | 3821 | health_code_update(); |
421cb601 DG |
3822 | return -1; |
3823 | } | |
48842b30 | 3824 | |
8be98f9a MD |
3825 | /* |
3826 | * Stop tracing for a specific UST session and app. | |
3827 | */ | |
b34cbebf | 3828 | static |
8be98f9a MD |
3829 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3830 | { | |
3831 | int ret = 0; | |
3832 | struct ust_app_session *ua_sess; | |
7972aab2 | 3833 | struct ust_registry_session *registry; |
8be98f9a | 3834 | |
852d0037 | 3835 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3836 | |
3837 | rcu_read_lock(); | |
3838 | ||
e0c7ec2b | 3839 | if (!app->compatible) { |
d88aee68 | 3840 | goto end_no_session; |
e0c7ec2b DG |
3841 | } |
3842 | ||
8be98f9a MD |
3843 | ua_sess = lookup_session_by_app(usess, app); |
3844 | if (ua_sess == NULL) { | |
d88aee68 | 3845 | goto end_no_session; |
8be98f9a MD |
3846 | } |
3847 | ||
d88aee68 DG |
3848 | pthread_mutex_lock(&ua_sess->lock); |
3849 | ||
9bc07046 DG |
3850 | /* |
3851 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3852 | * that was never started. It's possible since we can have a fail start |
3853 | * from either the application manager thread or the command thread. Simply | |
3854 | * indicate that this is a stop error. | |
9bc07046 | 3855 | */ |
f9dfc3d9 | 3856 | if (!ua_sess->started) { |
c45536e1 DG |
3857 | goto error_rcu_unlock; |
3858 | } | |
7db205b5 | 3859 | |
840cb59c | 3860 | health_code_update(); |
86acf0da | 3861 | |
9d6c7d3f | 3862 | /* This inhibits UST tracing */ |
852d0037 | 3863 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3864 | if (ret < 0) { |
ffe60014 DG |
3865 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3866 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3867 | app->pid, ret); | |
3868 | } else { | |
3869 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
3870 | /* |
3871 | * This is normal behavior, an application can die during the | |
3872 | * creation process. Don't report an error so the execution can | |
3873 | * continue normally. | |
3874 | */ | |
3875 | goto end_unlock; | |
ffe60014 | 3876 | } |
9d6c7d3f DG |
3877 | goto error_rcu_unlock; |
3878 | } | |
3879 | ||
840cb59c | 3880 | health_code_update(); |
86acf0da | 3881 | |
9d6c7d3f | 3882 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3883 | ret = ustctl_wait_quiescent(app->sock); |
3884 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3885 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3886 | app->pid, ret); | |
3887 | } | |
9d6c7d3f | 3888 | |
840cb59c | 3889 | health_code_update(); |
86acf0da | 3890 | |
b34cbebf MD |
3891 | registry = get_session_registry(ua_sess); |
3892 | assert(registry); | |
1b532a60 DG |
3893 | |
3894 | if (!registry->metadata_closed) { | |
3895 | /* Push metadata for application before freeing the application. */ | |
3896 | (void) push_metadata(registry, ua_sess->consumer); | |
3897 | } | |
b34cbebf | 3898 | |
3757b385 | 3899 | end_unlock: |
b34cbebf MD |
3900 | pthread_mutex_unlock(&ua_sess->lock); |
3901 | end_no_session: | |
3902 | rcu_read_unlock(); | |
3903 | health_code_update(); | |
3904 | return 0; | |
3905 | ||
3906 | error_rcu_unlock: | |
3907 | pthread_mutex_unlock(&ua_sess->lock); | |
3908 | rcu_read_unlock(); | |
3909 | health_code_update(); | |
3910 | return -1; | |
3911 | } | |
3912 | ||
3913 | /* | |
3914 | * Flush buffers for a specific UST session and app. | |
3915 | */ | |
3916 | static | |
3917 | int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
3918 | { | |
3919 | int ret = 0; | |
3920 | struct lttng_ht_iter iter; | |
3921 | struct ust_app_session *ua_sess; | |
3922 | struct ust_app_channel *ua_chan; | |
3923 | ||
3924 | DBG("Flushing buffers for ust app pid %d", app->pid); | |
3925 | ||
3926 | rcu_read_lock(); | |
3927 | ||
3928 | if (!app->compatible) { | |
3929 | goto end_no_session; | |
3930 | } | |
3931 | ||
3932 | ua_sess = lookup_session_by_app(usess, app); | |
3933 | if (ua_sess == NULL) { | |
3934 | goto end_no_session; | |
3935 | } | |
3936 | ||
3937 | pthread_mutex_lock(&ua_sess->lock); | |
3938 | ||
3939 | health_code_update(); | |
3940 | ||
9d6c7d3f | 3941 | /* Flushing buffers */ |
bec39940 DG |
3942 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
3943 | node.node) { | |
840cb59c | 3944 | health_code_update(); |
ffe60014 | 3945 | assert(ua_chan->is_sent); |
852d0037 | 3946 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 3947 | if (ret < 0) { |
ffe60014 DG |
3948 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3949 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
3950 | app->pid, ua_chan->name, ret); | |
3951 | } else { | |
3952 | DBG3("UST app failed to flush %s. Application is dead.", | |
3953 | ua_chan->name); | |
3757b385 DG |
3954 | /* |
3955 | * This is normal behavior, an application can die during the | |
3956 | * creation process. Don't report an error so the execution can | |
3957 | * continue normally. | |
3958 | */ | |
ffe60014 | 3959 | } |
6d3686da DG |
3960 | /* Continuing flushing all buffers */ |
3961 | continue; | |
8be98f9a MD |
3962 | } |
3963 | } | |
8be98f9a | 3964 | |
840cb59c | 3965 | health_code_update(); |
86acf0da | 3966 | |
d88aee68 DG |
3967 | pthread_mutex_unlock(&ua_sess->lock); |
3968 | end_no_session: | |
7db205b5 | 3969 | rcu_read_unlock(); |
840cb59c | 3970 | health_code_update(); |
8be98f9a | 3971 | return 0; |
8be98f9a MD |
3972 | } |
3973 | ||
84cd17c6 MD |
3974 | /* |
3975 | * Destroy a specific UST session in apps. | |
3976 | */ | |
3353de95 | 3977 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 3978 | { |
ffe60014 | 3979 | int ret; |
84cd17c6 | 3980 | struct ust_app_session *ua_sess; |
bec39940 | 3981 | struct lttng_ht_iter iter; |
d9bf3ca4 | 3982 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 3983 | |
852d0037 | 3984 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
3985 | |
3986 | rcu_read_lock(); | |
3987 | ||
e0c7ec2b DG |
3988 | if (!app->compatible) { |
3989 | goto end; | |
3990 | } | |
3991 | ||
84cd17c6 | 3992 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 3993 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 3994 | if (node == NULL) { |
d42f20df DG |
3995 | /* Session is being or is deleted. */ |
3996 | goto end; | |
84cd17c6 MD |
3997 | } |
3998 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 3999 | |
840cb59c | 4000 | health_code_update(); |
d0b96690 | 4001 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4002 | |
840cb59c | 4003 | health_code_update(); |
7db205b5 | 4004 | |
84cd17c6 | 4005 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4006 | ret = ustctl_wait_quiescent(app->sock); |
4007 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4008 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4009 | app->pid, ret); | |
4010 | } | |
e0c7ec2b DG |
4011 | end: |
4012 | rcu_read_unlock(); | |
840cb59c | 4013 | health_code_update(); |
84cd17c6 | 4014 | return 0; |
84cd17c6 MD |
4015 | } |
4016 | ||
5b4a0ec0 DG |
4017 | /* |
4018 | * Start tracing for the UST session. | |
4019 | */ | |
421cb601 DG |
4020 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4021 | { | |
4022 | int ret = 0; | |
bec39940 | 4023 | struct lttng_ht_iter iter; |
421cb601 | 4024 | struct ust_app *app; |
48842b30 | 4025 | |
421cb601 DG |
4026 | DBG("Starting all UST traces"); |
4027 | ||
4028 | rcu_read_lock(); | |
421cb601 | 4029 | |
852d0037 | 4030 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4031 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4032 | if (ret < 0) { |
5b4a0ec0 DG |
4033 | /* Continue to next apps even on error */ |
4034 | continue; | |
48842b30 | 4035 | } |
48842b30 | 4036 | } |
5b4a0ec0 | 4037 | |
48842b30 DG |
4038 | rcu_read_unlock(); |
4039 | ||
4040 | return 0; | |
4041 | } | |
487cf67c | 4042 | |
8be98f9a MD |
4043 | /* |
4044 | * Start tracing for the UST session. | |
4045 | */ | |
4046 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4047 | { | |
4048 | int ret = 0; | |
bec39940 | 4049 | struct lttng_ht_iter iter; |
8be98f9a MD |
4050 | struct ust_app *app; |
4051 | ||
4052 | DBG("Stopping all UST traces"); | |
4053 | ||
4054 | rcu_read_lock(); | |
4055 | ||
b34cbebf MD |
4056 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4057 | ret = ust_app_stop_trace(usess, app); | |
4058 | if (ret < 0) { | |
4059 | /* Continue to next apps even on error */ | |
4060 | continue; | |
4061 | } | |
4062 | } | |
4063 | ||
b0a5f0fb | 4064 | /* Flush buffers and push metadata (for UID buffers). */ |
b34cbebf MD |
4065 | switch (usess->buffer_type) { |
4066 | case LTTNG_BUFFER_PER_UID: | |
4067 | { | |
7972aab2 | 4068 | struct buffer_reg_uid *reg; |
b34cbebf MD |
4069 | |
4070 | /* Flush all per UID buffers associated to that session. */ | |
7972aab2 | 4071 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
b0a5f0fb | 4072 | struct ust_registry_session *ust_session_reg; |
7972aab2 DG |
4073 | struct buffer_reg_channel *reg_chan; |
4074 | struct consumer_socket *socket; | |
4075 | ||
4076 | /* Get consumer socket to use to push the metadata.*/ | |
4077 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4078 | usess->consumer); | |
4079 | if (!socket) { | |
4080 | /* Ignore request if no consumer is found for the session. */ | |
4081 | continue; | |
4082 | } | |
4083 | ||
4084 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4085 | reg_chan, node.node) { | |
4086 | /* | |
4087 | * The following call will print error values so the return | |
4088 | * code is of little importance because whatever happens, we | |
4089 | * have to try them all. | |
4090 | */ | |
4091 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4092 | } | |
b0a5f0fb MD |
4093 | |
4094 | ust_session_reg = reg->registry->reg.ust; | |
4095 | if (!ust_session_reg->metadata_closed) { | |
4096 | /* Push metadata. */ | |
4097 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4098 | } | |
7972aab2 | 4099 | } |
b0a5f0fb | 4100 | |
b34cbebf | 4101 | break; |
7972aab2 | 4102 | } |
b34cbebf MD |
4103 | case LTTNG_BUFFER_PER_PID: |
4104 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4105 | ret = ust_app_flush_trace(usess, app); | |
4106 | if (ret < 0) { | |
4107 | /* Continue to next apps even on error */ | |
4108 | continue; | |
4109 | } | |
8be98f9a | 4110 | } |
b34cbebf MD |
4111 | break; |
4112 | default: | |
4113 | assert(0); | |
4114 | break; | |
8be98f9a MD |
4115 | } |
4116 | ||
4117 | rcu_read_unlock(); | |
4118 | ||
4119 | return 0; | |
4120 | } | |
4121 | ||
84cd17c6 MD |
4122 | /* |
4123 | * Destroy app UST session. | |
4124 | */ | |
4125 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4126 | { | |
4127 | int ret = 0; | |
bec39940 | 4128 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4129 | struct ust_app *app; |
4130 | ||
4131 | DBG("Destroy all UST traces"); | |
4132 | ||
4133 | rcu_read_lock(); | |
4134 | ||
852d0037 | 4135 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4136 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4137 | if (ret < 0) { |
4138 | /* Continue to next apps even on error */ | |
4139 | continue; | |
4140 | } | |
4141 | } | |
4142 | ||
4143 | rcu_read_unlock(); | |
4144 | ||
4145 | return 0; | |
4146 | } | |
4147 | ||
5b4a0ec0 DG |
4148 | /* |
4149 | * Add channels/events from UST global domain to registered apps at sock. | |
4150 | */ | |
487cf67c DG |
4151 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4152 | { | |
55c54cce | 4153 | int ret = 0; |
31746f93 | 4154 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4155 | struct ust_app *app; |
3d8ca23b | 4156 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4157 | struct ust_app_channel *ua_chan; |
4158 | struct ust_app_event *ua_event; | |
727d5404 | 4159 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4160 | |
95e047ff | 4161 | assert(usess); |
ffe60014 | 4162 | assert(sock >= 0); |
1f3580c7 | 4163 | |
d9bf3ca4 | 4164 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4165 | usess->id); |
487cf67c | 4166 | |
284d8f55 DG |
4167 | rcu_read_lock(); |
4168 | ||
487cf67c DG |
4169 | app = find_app_by_sock(sock); |
4170 | if (app == NULL) { | |
d88aee68 DG |
4171 | /* |
4172 | * Application can be unregistered before so this is possible hence | |
4173 | * simply stopping the update. | |
4174 | */ | |
4175 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4176 | goto error; |
4177 | } | |
4178 | ||
e0c7ec2b DG |
4179 | if (!app->compatible) { |
4180 | goto error; | |
4181 | } | |
4182 | ||
3d8ca23b DG |
4183 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4184 | if (ret < 0) { | |
4185 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4186 | goto error; |
4187 | } | |
3d8ca23b | 4188 | assert(ua_sess); |
487cf67c | 4189 | |
d0b96690 DG |
4190 | pthread_mutex_lock(&ua_sess->lock); |
4191 | ||
284d8f55 | 4192 | /* |
d0b96690 | 4193 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4194 | * app session above made a shadow copy of the UST global domain from the |
4195 | * ltt ust session. | |
4196 | */ | |
bec39940 DG |
4197 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4198 | node.node) { | |
d65d2de8 DG |
4199 | /* |
4200 | * For a metadata channel, handle it differently. | |
4201 | */ | |
4202 | if (!strncmp(ua_chan->name, DEFAULT_METADATA_NAME, | |
4203 | sizeof(ua_chan->name))) { | |
4204 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
4205 | &ua_chan->attr); | |
c7a339aa DG |
4206 | if (ret < 0) { |
4207 | goto error_unlock; | |
4208 | } | |
d65d2de8 DG |
4209 | /* Remove it from the hash table and continue!. */ |
4210 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
4211 | assert(!ret); | |
4212 | delete_ust_app_channel(-1, ua_chan, app); | |
4213 | continue; | |
4214 | } else { | |
4215 | ret = do_create_channel(app, usess, ua_sess, ua_chan); | |
c7a339aa DG |
4216 | if (ret < 0) { |
4217 | /* | |
4218 | * Stop everything. On error, the application failed, no more | |
4219 | * file descriptor are available or ENOMEM so stopping here is | |
4220 | * the only thing we can do for now. | |
4221 | */ | |
4222 | goto error_unlock; | |
4223 | } | |
487cf67c DG |
4224 | } |
4225 | ||
31746f93 DG |
4226 | /* |
4227 | * Add context using the list so they are enabled in the same order the | |
4228 | * user added them. | |
4229 | */ | |
4230 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4231 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4232 | if (ret < 0) { | |
d0b96690 | 4233 | goto error_unlock; |
727d5404 DG |
4234 | } |
4235 | } | |
4236 | ||
4237 | ||
284d8f55 | 4238 | /* For each events */ |
bec39940 DG |
4239 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4240 | node.node) { | |
284d8f55 DG |
4241 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4242 | if (ret < 0) { | |
d0b96690 | 4243 | goto error_unlock; |
487cf67c | 4244 | } |
36dc12cc | 4245 | } |
487cf67c DG |
4246 | } |
4247 | ||
d0b96690 DG |
4248 | pthread_mutex_unlock(&ua_sess->lock); |
4249 | ||
36dc12cc | 4250 | if (usess->start_trace) { |
421cb601 | 4251 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4252 | if (ret < 0) { |
36dc12cc DG |
4253 | goto error; |
4254 | } | |
4255 | ||
852d0037 | 4256 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4257 | } |
4258 | ||
ffe60014 DG |
4259 | /* Everything went well at this point. */ |
4260 | rcu_read_unlock(); | |
4261 | return; | |
4262 | ||
d0b96690 DG |
4263 | error_unlock: |
4264 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4265 | error: |
ffe60014 | 4266 | if (ua_sess) { |
d0b96690 | 4267 | destroy_app_session(app, ua_sess); |
ffe60014 | 4268 | } |
487cf67c DG |
4269 | rcu_read_unlock(); |
4270 | return; | |
4271 | } | |
55cc08a6 DG |
4272 | |
4273 | /* | |
4274 | * Add context to a specific channel for global UST domain. | |
4275 | */ | |
4276 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4277 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4278 | { | |
4279 | int ret = 0; | |
bec39940 DG |
4280 | struct lttng_ht_node_str *ua_chan_node; |
4281 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4282 | struct ust_app_channel *ua_chan = NULL; |
4283 | struct ust_app_session *ua_sess; | |
4284 | struct ust_app *app; | |
4285 | ||
4286 | rcu_read_lock(); | |
4287 | ||
852d0037 | 4288 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4289 | if (!app->compatible) { |
4290 | /* | |
4291 | * TODO: In time, we should notice the caller of this error by | |
4292 | * telling him that this is a version error. | |
4293 | */ | |
4294 | continue; | |
4295 | } | |
55cc08a6 DG |
4296 | ua_sess = lookup_session_by_app(usess, app); |
4297 | if (ua_sess == NULL) { | |
4298 | continue; | |
4299 | } | |
4300 | ||
d0b96690 | 4301 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4302 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4303 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4304 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4305 | if (ua_chan_node == NULL) { |
d0b96690 | 4306 | goto next_app; |
55cc08a6 DG |
4307 | } |
4308 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4309 | node); | |
55cc08a6 DG |
4310 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4311 | if (ret < 0) { | |
d0b96690 | 4312 | goto next_app; |
55cc08a6 | 4313 | } |
d0b96690 DG |
4314 | next_app: |
4315 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4316 | } |
4317 | ||
55cc08a6 DG |
4318 | rcu_read_unlock(); |
4319 | return ret; | |
4320 | } | |
4321 | ||
76d45b40 DG |
4322 | /* |
4323 | * Enable event for a channel from a UST session for a specific PID. | |
4324 | */ | |
4325 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4326 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4327 | { | |
4328 | int ret = 0; | |
bec39940 | 4329 | struct lttng_ht_iter iter; |
18eace3b | 4330 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4331 | struct ust_app *app; |
4332 | struct ust_app_session *ua_sess; | |
4333 | struct ust_app_channel *ua_chan; | |
4334 | struct ust_app_event *ua_event; | |
4335 | ||
4336 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4337 | ||
4338 | rcu_read_lock(); | |
4339 | ||
4340 | app = ust_app_find_by_pid(pid); | |
4341 | if (app == NULL) { | |
4342 | ERR("UST app enable event per PID %d not found", pid); | |
4343 | ret = -1; | |
d0b96690 | 4344 | goto end; |
76d45b40 DG |
4345 | } |
4346 | ||
e0c7ec2b DG |
4347 | if (!app->compatible) { |
4348 | ret = 0; | |
d0b96690 | 4349 | goto end; |
e0c7ec2b DG |
4350 | } |
4351 | ||
76d45b40 | 4352 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4353 | if (!ua_sess) { |
4354 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4355 | ret = 0; |
4356 | goto end; | |
c4a1715b | 4357 | } |
76d45b40 | 4358 | |
d0b96690 | 4359 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4360 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4361 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4362 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4363 | /* If the channel is not found, there is a code flow error */ |
4364 | assert(ua_chan_node); | |
4365 | ||
4366 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4367 | ||
18eace3b DG |
4368 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4369 | uevent->filter, uevent->attr.loglevel); | |
4370 | if (ua_event == NULL) { | |
76d45b40 DG |
4371 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4372 | if (ret < 0) { | |
d0b96690 | 4373 | goto end_unlock; |
76d45b40 DG |
4374 | } |
4375 | } else { | |
76d45b40 DG |
4376 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4377 | if (ret < 0) { | |
d0b96690 | 4378 | goto end_unlock; |
76d45b40 DG |
4379 | } |
4380 | } | |
4381 | ||
d0b96690 DG |
4382 | end_unlock: |
4383 | pthread_mutex_unlock(&ua_sess->lock); | |
4384 | end: | |
76d45b40 DG |
4385 | rcu_read_unlock(); |
4386 | return ret; | |
4387 | } | |
7f79d3a1 DG |
4388 | |
4389 | /* | |
4390 | * Disable event for a channel from a UST session for a specific PID. | |
4391 | */ | |
4392 | int ust_app_disable_event_pid(struct ltt_ust_session *usess, | |
4393 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4394 | { | |
4395 | int ret = 0; | |
bec39940 DG |
4396 | struct lttng_ht_iter iter; |
4397 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
7f79d3a1 DG |
4398 | struct ust_app *app; |
4399 | struct ust_app_session *ua_sess; | |
4400 | struct ust_app_channel *ua_chan; | |
4401 | struct ust_app_event *ua_event; | |
4402 | ||
4403 | DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); | |
4404 | ||
4405 | rcu_read_lock(); | |
4406 | ||
4407 | app = ust_app_find_by_pid(pid); | |
4408 | if (app == NULL) { | |
4409 | ERR("UST app disable event per PID %d not found", pid); | |
4410 | ret = -1; | |
4411 | goto error; | |
4412 | } | |
4413 | ||
e0c7ec2b DG |
4414 | if (!app->compatible) { |
4415 | ret = 0; | |
4416 | goto error; | |
4417 | } | |
4418 | ||
7f79d3a1 | 4419 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4420 | if (!ua_sess) { |
4421 | /* The application has problem or is probably dead. */ | |
4422 | goto error; | |
4423 | } | |
7f79d3a1 DG |
4424 | |
4425 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4426 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4427 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4428 | if (ua_chan_node == NULL) { |
4429 | /* Channel does not exist, skip disabling */ | |
4430 | goto error; | |
4431 | } | |
4432 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4433 | ||
bec39940 DG |
4434 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); |
4435 | ua_event_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4436 | if (ua_event_node == NULL) { |
4437 | /* Event does not exist, skip disabling */ | |
4438 | goto error; | |
4439 | } | |
4440 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
4441 | ||
4442 | ret = disable_ust_app_event(ua_sess, ua_event, app); | |
4443 | if (ret < 0) { | |
4444 | goto error; | |
4445 | } | |
4446 | ||
4447 | error: | |
4448 | rcu_read_unlock(); | |
4449 | return ret; | |
4450 | } | |
e0c7ec2b | 4451 | |
4466912f DG |
4452 | /* |
4453 | * Calibrate registered applications. | |
4454 | */ | |
4455 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4456 | { | |
4457 | int ret = 0; | |
4458 | struct lttng_ht_iter iter; | |
4459 | struct ust_app *app; | |
4460 | ||
4461 | rcu_read_lock(); | |
4462 | ||
852d0037 | 4463 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4464 | if (!app->compatible) { |
4465 | /* | |
4466 | * TODO: In time, we should notice the caller of this error by | |
4467 | * telling him that this is a version error. | |
4468 | */ | |
4469 | continue; | |
4470 | } | |
4471 | ||
840cb59c | 4472 | health_code_update(); |
86acf0da | 4473 | |
852d0037 | 4474 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4475 | if (ret < 0) { |
4476 | switch (ret) { | |
4477 | case -ENOSYS: | |
4478 | /* Means that it's not implemented on the tracer side. */ | |
4479 | ret = 0; | |
4480 | break; | |
4481 | default: | |
4466912f | 4482 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4483 | app->pid, ret); |
4466912f DG |
4484 | break; |
4485 | } | |
4486 | } | |
4487 | } | |
4488 | ||
4489 | DBG("UST app global domain calibration finished"); | |
4490 | ||
4491 | rcu_read_unlock(); | |
4492 | ||
840cb59c | 4493 | health_code_update(); |
86acf0da | 4494 | |
4466912f DG |
4495 | return ret; |
4496 | } | |
d0b96690 DG |
4497 | |
4498 | /* | |
4499 | * Receive registration and populate the given msg structure. | |
4500 | * | |
4501 | * On success return 0 else a negative value returned by the ustctl call. | |
4502 | */ | |
4503 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4504 | { | |
4505 | int ret; | |
4506 | uint32_t pid, ppid, uid, gid; | |
4507 | ||
4508 | assert(msg); | |
4509 | ||
4510 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4511 | &pid, &ppid, &uid, &gid, | |
4512 | &msg->bits_per_long, | |
4513 | &msg->uint8_t_alignment, | |
4514 | &msg->uint16_t_alignment, | |
4515 | &msg->uint32_t_alignment, | |
4516 | &msg->uint64_t_alignment, | |
4517 | &msg->long_alignment, | |
4518 | &msg->byte_order, | |
4519 | msg->name); | |
4520 | if (ret < 0) { | |
4521 | switch (-ret) { | |
4522 | case EPIPE: | |
4523 | case ECONNRESET: | |
4524 | case LTTNG_UST_ERR_EXITING: | |
4525 | DBG3("UST app recv reg message failed. Application died"); | |
4526 | break; | |
4527 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4528 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4529 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4530 | LTTNG_UST_ABI_MINOR_VERSION); | |
4531 | break; | |
4532 | default: | |
4533 | ERR("UST app recv reg message failed with ret %d", ret); | |
4534 | break; | |
4535 | } | |
4536 | goto error; | |
4537 | } | |
4538 | msg->pid = (pid_t) pid; | |
4539 | msg->ppid = (pid_t) ppid; | |
4540 | msg->uid = (uid_t) uid; | |
4541 | msg->gid = (gid_t) gid; | |
4542 | ||
4543 | error: | |
4544 | return ret; | |
4545 | } | |
4546 | ||
d88aee68 DG |
4547 | /* |
4548 | * Return a ust app channel object using the application object and the channel | |
4549 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4550 | * lock MUST be acquired before calling this function. | |
4551 | */ | |
d0b96690 DG |
4552 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4553 | int objd) | |
4554 | { | |
4555 | struct lttng_ht_node_ulong *node; | |
4556 | struct lttng_ht_iter iter; | |
4557 | struct ust_app_channel *ua_chan = NULL; | |
4558 | ||
4559 | assert(app); | |
4560 | ||
4561 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4562 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4563 | if (node == NULL) { | |
4564 | DBG2("UST app channel find by objd %d not found", objd); | |
4565 | goto error; | |
4566 | } | |
4567 | ||
4568 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4569 | ||
4570 | error: | |
4571 | return ua_chan; | |
4572 | } | |
4573 | ||
d88aee68 DG |
4574 | /* |
4575 | * Reply to a register channel notification from an application on the notify | |
4576 | * socket. The channel metadata is also created. | |
4577 | * | |
4578 | * The session UST registry lock is acquired in this function. | |
4579 | * | |
4580 | * On success 0 is returned else a negative value. | |
4581 | */ | |
d0b96690 DG |
4582 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4583 | size_t nr_fields, struct ustctl_field *fields) | |
4584 | { | |
4585 | int ret, ret_code = 0; | |
4586 | uint32_t chan_id, reg_count; | |
7972aab2 | 4587 | uint64_t chan_reg_key; |
d0b96690 DG |
4588 | enum ustctl_channel_header type; |
4589 | struct ust_app *app; | |
4590 | struct ust_app_channel *ua_chan; | |
4591 | struct ust_app_session *ua_sess; | |
7972aab2 | 4592 | struct ust_registry_session *registry; |
45893984 | 4593 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4594 | |
4595 | rcu_read_lock(); | |
4596 | ||
4597 | /* Lookup application. If not found, there is a code flow error. */ | |
4598 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4599 | if (!app) { |
4600 | DBG("Application socket %d is being teardown. Abort event notify", | |
4601 | sock); | |
4602 | ret = 0; | |
d5d629b5 | 4603 | free(fields); |
d88aee68 DG |
4604 | goto error_rcu_unlock; |
4605 | } | |
d0b96690 | 4606 | |
4950b860 | 4607 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4608 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4609 | if (!ua_chan) { |
4610 | DBG("Application channel is being teardown. Abort event notify"); | |
4611 | ret = 0; | |
d5d629b5 | 4612 | free(fields); |
4950b860 MD |
4613 | goto error_rcu_unlock; |
4614 | } | |
4615 | ||
d0b96690 DG |
4616 | assert(ua_chan->session); |
4617 | ua_sess = ua_chan->session; | |
d0b96690 | 4618 | |
7972aab2 DG |
4619 | /* Get right session registry depending on the session buffer type. */ |
4620 | registry = get_session_registry(ua_sess); | |
4621 | assert(registry); | |
45893984 | 4622 | |
7972aab2 DG |
4623 | /* Depending on the buffer type, a different channel key is used. */ |
4624 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4625 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4626 | } else { |
7972aab2 | 4627 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4628 | } |
4629 | ||
7972aab2 DG |
4630 | pthread_mutex_lock(®istry->lock); |
4631 | ||
4632 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4633 | assert(chan_reg); | |
4634 | ||
4635 | if (!chan_reg->register_done) { | |
4636 | reg_count = ust_registry_get_event_count(chan_reg); | |
4637 | if (reg_count < 31) { | |
4638 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4639 | } else { | |
4640 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4641 | } | |
4642 | ||
4643 | chan_reg->nr_ctx_fields = nr_fields; | |
4644 | chan_reg->ctx_fields = fields; | |
4645 | chan_reg->header_type = type; | |
d0b96690 | 4646 | } else { |
7972aab2 DG |
4647 | /* Get current already assigned values. */ |
4648 | type = chan_reg->header_type; | |
d5d629b5 DG |
4649 | free(fields); |
4650 | /* Set to NULL so the error path does not do a double free. */ | |
4651 | fields = NULL; | |
d0b96690 | 4652 | } |
7972aab2 DG |
4653 | /* Channel id is set during the object creation. */ |
4654 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4655 | |
4656 | /* Append to metadata */ | |
7972aab2 DG |
4657 | if (!chan_reg->metadata_dumped) { |
4658 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4659 | if (ret_code) { |
4660 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4661 | goto reply; | |
4662 | } | |
4663 | } | |
4664 | ||
4665 | reply: | |
7972aab2 DG |
4666 | DBG3("UST app replying to register channel key %" PRIu64 |
4667 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4668 | ret_code); | |
d0b96690 DG |
4669 | |
4670 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4671 | if (ret < 0) { | |
4672 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4673 | ERR("UST app reply channel failed with ret %d", ret); | |
4674 | } else { | |
4675 | DBG3("UST app reply channel failed. Application died"); | |
4676 | } | |
4677 | goto error; | |
4678 | } | |
4679 | ||
7972aab2 DG |
4680 | /* This channel registry registration is completed. */ |
4681 | chan_reg->register_done = 1; | |
4682 | ||
d0b96690 | 4683 | error: |
7972aab2 | 4684 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4685 | error_rcu_unlock: |
d0b96690 | 4686 | rcu_read_unlock(); |
d5d629b5 DG |
4687 | if (ret) { |
4688 | free(fields); | |
4689 | } | |
d0b96690 DG |
4690 | return ret; |
4691 | } | |
4692 | ||
d88aee68 DG |
4693 | /* |
4694 | * Add event to the UST channel registry. When the event is added to the | |
4695 | * registry, the metadata is also created. Once done, this replies to the | |
4696 | * application with the appropriate error code. | |
4697 | * | |
4698 | * The session UST registry lock is acquired in the function. | |
4699 | * | |
4700 | * On success 0 is returned else a negative value. | |
4701 | */ | |
d0b96690 DG |
4702 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4703 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4704 | char *model_emf_uri) | |
4705 | { | |
4706 | int ret, ret_code; | |
4707 | uint32_t event_id = 0; | |
7972aab2 | 4708 | uint64_t chan_reg_key; |
d0b96690 DG |
4709 | struct ust_app *app; |
4710 | struct ust_app_channel *ua_chan; | |
4711 | struct ust_app_session *ua_sess; | |
7972aab2 | 4712 | struct ust_registry_session *registry; |
d0b96690 DG |
4713 | |
4714 | rcu_read_lock(); | |
4715 | ||
4716 | /* Lookup application. If not found, there is a code flow error. */ | |
4717 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4718 | if (!app) { |
4719 | DBG("Application socket %d is being teardown. Abort event notify", | |
4720 | sock); | |
4721 | ret = 0; | |
d5d629b5 DG |
4722 | free(sig); |
4723 | free(fields); | |
4724 | free(model_emf_uri); | |
d88aee68 DG |
4725 | goto error_rcu_unlock; |
4726 | } | |
d0b96690 | 4727 | |
4950b860 | 4728 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4729 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4730 | if (!ua_chan) { |
4731 | DBG("Application channel is being teardown. Abort event notify"); | |
4732 | ret = 0; | |
d5d629b5 DG |
4733 | free(sig); |
4734 | free(fields); | |
4735 | free(model_emf_uri); | |
4950b860 MD |
4736 | goto error_rcu_unlock; |
4737 | } | |
4738 | ||
d0b96690 DG |
4739 | assert(ua_chan->session); |
4740 | ua_sess = ua_chan->session; | |
4741 | ||
7972aab2 DG |
4742 | registry = get_session_registry(ua_sess); |
4743 | assert(registry); | |
4744 | ||
4745 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4746 | chan_reg_key = ua_chan->tracing_channel_id; | |
4747 | } else { | |
4748 | chan_reg_key = ua_chan->key; | |
4749 | } | |
4750 | ||
4751 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4752 | |
d5d629b5 DG |
4753 | /* |
4754 | * From this point on, this call acquires the ownership of the sig, fields | |
4755 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4756 | * three variables MUST NOT be read/write after this. | |
4757 | */ | |
7972aab2 | 4758 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4759 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
8494bda5 MD |
4760 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4761 | app); | |
d0b96690 DG |
4762 | |
4763 | /* | |
4764 | * The return value is returned to ustctl so in case of an error, the | |
4765 | * application can be notified. In case of an error, it's important not to | |
4766 | * return a negative error or else the application will get closed. | |
4767 | */ | |
4768 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4769 | if (ret < 0) { | |
4770 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4771 | ERR("UST app reply event failed with ret %d", ret); | |
4772 | } else { | |
4773 | DBG3("UST app reply event failed. Application died"); | |
4774 | } | |
4775 | /* | |
4776 | * No need to wipe the create event since the application socket will | |
4777 | * get close on error hence cleaning up everything by itself. | |
4778 | */ | |
4779 | goto error; | |
4780 | } | |
4781 | ||
7972aab2 DG |
4782 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4783 | name, event_id); | |
d88aee68 | 4784 | |
d0b96690 | 4785 | error: |
7972aab2 | 4786 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4787 | error_rcu_unlock: |
d0b96690 DG |
4788 | rcu_read_unlock(); |
4789 | return ret; | |
4790 | } | |
4791 | ||
d88aee68 DG |
4792 | /* |
4793 | * Handle application notification through the given notify socket. | |
4794 | * | |
4795 | * Return 0 on success or else a negative value. | |
4796 | */ | |
d0b96690 DG |
4797 | int ust_app_recv_notify(int sock) |
4798 | { | |
4799 | int ret; | |
4800 | enum ustctl_notify_cmd cmd; | |
4801 | ||
4802 | DBG3("UST app receiving notify from sock %d", sock); | |
4803 | ||
4804 | ret = ustctl_recv_notify(sock, &cmd); | |
4805 | if (ret < 0) { | |
4806 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4807 | ERR("UST app recv notify failed with ret %d", ret); | |
4808 | } else { | |
4809 | DBG3("UST app recv notify failed. Application died"); | |
4810 | } | |
4811 | goto error; | |
4812 | } | |
4813 | ||
4814 | switch (cmd) { | |
4815 | case USTCTL_NOTIFY_CMD_EVENT: | |
4816 | { | |
4817 | int sobjd, cobjd, loglevel; | |
4818 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4819 | size_t nr_fields; | |
4820 | struct ustctl_field *fields; | |
4821 | ||
4822 | DBG2("UST app ustctl register event received"); | |
4823 | ||
4824 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4825 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4826 | if (ret < 0) { | |
4827 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4828 | ERR("UST app recv event failed with ret %d", ret); | |
4829 | } else { | |
4830 | DBG3("UST app recv event failed. Application died"); | |
4831 | } | |
4832 | goto error; | |
4833 | } | |
4834 | ||
d5d629b5 DG |
4835 | /* |
4836 | * Add event to the UST registry coming from the notify socket. This | |
4837 | * call will free if needed the sig, fields and model_emf_uri. This | |
4838 | * code path loses the ownsership of these variables and transfer them | |
4839 | * to the this function. | |
4840 | */ | |
d0b96690 DG |
4841 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4842 | fields, loglevel, model_emf_uri); | |
4843 | if (ret < 0) { | |
4844 | goto error; | |
4845 | } | |
4846 | ||
4847 | break; | |
4848 | } | |
4849 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4850 | { | |
4851 | int sobjd, cobjd; | |
4852 | size_t nr_fields; | |
4853 | struct ustctl_field *fields; | |
4854 | ||
4855 | DBG2("UST app ustctl register channel received"); | |
4856 | ||
4857 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4858 | &fields); | |
4859 | if (ret < 0) { | |
4860 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4861 | ERR("UST app recv channel failed with ret %d", ret); | |
4862 | } else { | |
4863 | DBG3("UST app recv channel failed. Application died"); | |
4864 | } | |
4865 | goto error; | |
4866 | } | |
4867 | ||
d5d629b5 DG |
4868 | /* |
4869 | * The fields ownership are transfered to this function call meaning | |
4870 | * that if needed it will be freed. After this, it's invalid to access | |
4871 | * fields or clean it up. | |
4872 | */ | |
d0b96690 DG |
4873 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4874 | fields); | |
4875 | if (ret < 0) { | |
4876 | goto error; | |
4877 | } | |
4878 | ||
4879 | break; | |
4880 | } | |
4881 | default: | |
4882 | /* Should NEVER happen. */ | |
4883 | assert(0); | |
4884 | } | |
4885 | ||
4886 | error: | |
4887 | return ret; | |
4888 | } | |
d88aee68 DG |
4889 | |
4890 | /* | |
4891 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4892 | * corresponding application. On failure, the call_rcu to close the socket is | |
4893 | * executed. If an application is found, it tries to delete it from the notify | |
4894 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4895 | * | |
4896 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4897 | * call RCU is not done but the rest of the cleanup is. | |
4898 | */ | |
4899 | void ust_app_notify_sock_unregister(int sock) | |
4900 | { | |
4901 | int err_enomem = 0; | |
4902 | struct lttng_ht_iter iter; | |
4903 | struct ust_app *app; | |
4904 | struct ust_app_notify_sock_obj *obj; | |
4905 | ||
4906 | assert(sock >= 0); | |
4907 | ||
4908 | rcu_read_lock(); | |
4909 | ||
4910 | obj = zmalloc(sizeof(*obj)); | |
4911 | if (!obj) { | |
4912 | /* | |
4913 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4914 | * procedure but the call_rcu will not be called. In this case, we | |
4915 | * accept the fd leak rather than possibly creating an unsynchronized | |
4916 | * state between threads. | |
4917 | * | |
4918 | * TODO: The notify object should be created once the notify socket is | |
4919 | * registered and stored independantely from the ust app object. The | |
4920 | * tricky part is to synchronize the teardown of the application and | |
4921 | * this notify object. Let's keep that in mind so we can avoid this | |
4922 | * kind of shenanigans with ENOMEM in the teardown path. | |
4923 | */ | |
4924 | err_enomem = 1; | |
4925 | } else { | |
4926 | obj->fd = sock; | |
4927 | } | |
4928 | ||
4929 | DBG("UST app notify socket unregister %d", sock); | |
4930 | ||
4931 | /* | |
4932 | * Lookup application by notify socket. If this fails, this means that the | |
4933 | * hash table delete has already been done by the application | |
4934 | * unregistration process so we can safely close the notify socket in a | |
4935 | * call RCU. | |
4936 | */ | |
4937 | app = find_app_by_notify_sock(sock); | |
4938 | if (!app) { | |
4939 | goto close_socket; | |
4940 | } | |
4941 | ||
4942 | iter.iter.node = &app->notify_sock_n.node; | |
4943 | ||
4944 | /* | |
4945 | * Whatever happens here either we fail or succeed, in both cases we have | |
4946 | * to close the socket after a grace period to continue to the call RCU | |
4947 | * here. If the deletion is successful, the application is not visible | |
4948 | * anymore by other threads and is it fails it means that it was already | |
4949 | * deleted from the hash table so either way we just have to close the | |
4950 | * socket. | |
4951 | */ | |
4952 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4953 | ||
4954 | close_socket: | |
4955 | rcu_read_unlock(); | |
4956 | ||
4957 | /* | |
4958 | * Close socket after a grace period to avoid for the socket to be reused | |
4959 | * before the application object is freed creating potential race between | |
4960 | * threads trying to add unique in the global hash table. | |
4961 | */ | |
4962 | if (!err_enomem) { | |
4963 | call_rcu(&obj->head, close_notify_sock_rcu); | |
4964 | } | |
4965 | } | |
f45e313d DG |
4966 | |
4967 | /* | |
4968 | * Destroy a ust app data structure and free its memory. | |
4969 | */ | |
4970 | void ust_app_destroy(struct ust_app *app) | |
4971 | { | |
4972 | if (!app) { | |
4973 | return; | |
4974 | } | |
4975 | ||
4976 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
4977 | } | |
6dc3064a DG |
4978 | |
4979 | /* | |
4980 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
4981 | * output. | |
4982 | * | |
4983 | * Return 0 on success or else a negative value. | |
4984 | */ | |
4985 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
5c786ded | 4986 | struct snapshot_output *output, int wait, unsigned int nb_streams) |
6dc3064a DG |
4987 | { |
4988 | int ret = 0; | |
4989 | struct lttng_ht_iter iter; | |
4990 | struct ust_app *app; | |
af706bb7 | 4991 | char pathname[PATH_MAX]; |
5c786ded | 4992 | uint64_t max_stream_size = 0; |
6dc3064a DG |
4993 | |
4994 | assert(usess); | |
4995 | assert(output); | |
4996 | ||
4997 | rcu_read_lock(); | |
4998 | ||
5c786ded JD |
4999 | /* |
5000 | * Compute the maximum size of a single stream if a max size is asked by | |
5001 | * the caller. | |
5002 | */ | |
5003 | if (output->max_size > 0 && nb_streams > 0) { | |
5004 | max_stream_size = output->max_size / nb_streams; | |
5005 | } | |
5006 | ||
8c924c7b MD |
5007 | switch (usess->buffer_type) { |
5008 | case LTTNG_BUFFER_PER_UID: | |
5009 | { | |
5010 | struct buffer_reg_uid *reg; | |
6dc3064a | 5011 | |
8c924c7b MD |
5012 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5013 | struct buffer_reg_channel *reg_chan; | |
5014 | struct consumer_socket *socket; | |
6dc3064a | 5015 | |
8c924c7b MD |
5016 | /* Get consumer socket to use to push the metadata.*/ |
5017 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5018 | usess->consumer); | |
5019 | if (!socket) { | |
5020 | ret = -EINVAL; | |
5021 | goto error; | |
5022 | } | |
6dc3064a | 5023 | |
8c924c7b MD |
5024 | memset(pathname, 0, sizeof(pathname)); |
5025 | ret = snprintf(pathname, sizeof(pathname), | |
5026 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5027 | reg->uid, reg->bits_per_long); | |
5028 | if (ret < 0) { | |
5029 | PERROR("snprintf snapshot path"); | |
5030 | goto error; | |
5031 | } | |
5032 | ||
5033 | /* Add the UST default trace dir to path. */ | |
5034 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5035 | reg_chan, node.node) { | |
5036 | ||
5037 | /* | |
5038 | * Make sure the maximum stream size is not lower than the | |
5039 | * subbuffer size or else it's an error since we won't be able to | |
5040 | * snapshot anything. | |
5041 | */ | |
5042 | if (max_stream_size && | |
5043 | reg_chan->subbuf_size > max_stream_size) { | |
5044 | ret = -EINVAL; | |
5045 | DBG3("UST app snapshot record maximum stream size %" PRIu64 | |
6a00837f | 5046 | " is smaller than subbuffer size of %zu", |
8c924c7b MD |
5047 | max_stream_size, reg_chan->subbuf_size); |
5048 | goto error; | |
5049 | } | |
5050 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, output, 0, | |
5051 | usess->uid, usess->gid, pathname, wait, | |
5052 | max_stream_size); | |
5053 | if (ret < 0) { | |
5054 | goto error; | |
5055 | } | |
5056 | } | |
5057 | ret = consumer_snapshot_channel(socket, reg->registry->reg.ust->metadata_key, output, | |
5058 | 1, usess->uid, usess->gid, pathname, wait, | |
5059 | max_stream_size); | |
5060 | if (ret < 0) { | |
5061 | goto error; | |
5062 | } | |
af706bb7 | 5063 | } |
8c924c7b MD |
5064 | break; |
5065 | } | |
5066 | case LTTNG_BUFFER_PER_PID: | |
5067 | { | |
5068 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5069 | struct consumer_socket *socket; | |
5070 | struct lttng_ht_iter chan_iter; | |
5071 | struct ust_app_channel *ua_chan; | |
5072 | struct ust_app_session *ua_sess; | |
5073 | struct ust_registry_session *registry; | |
5074 | ||
5075 | ua_sess = lookup_session_by_app(usess, app); | |
5076 | if (!ua_sess) { | |
5077 | /* Session not associated with this app. */ | |
5078 | continue; | |
5079 | } | |
af706bb7 | 5080 | |
8c924c7b MD |
5081 | /* Get the right consumer socket for the application. */ |
5082 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5083 | output->consumer); | |
5084 | if (!socket) { | |
5c786ded | 5085 | ret = -EINVAL; |
5c786ded JD |
5086 | goto error; |
5087 | } | |
5088 | ||
8c924c7b MD |
5089 | /* Add the UST default trace dir to path. */ |
5090 | memset(pathname, 0, sizeof(pathname)); | |
5091 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5092 | ua_sess->path); | |
6dc3064a | 5093 | if (ret < 0) { |
8c924c7b | 5094 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5095 | goto error; |
5096 | } | |
6dc3064a | 5097 | |
8c924c7b MD |
5098 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5099 | ua_chan, node.node) { | |
5100 | /* | |
5101 | * Make sure the maximum stream size is not lower than the | |
5102 | * subbuffer size or else it's an error since we won't be able to | |
5103 | * snapshot anything. | |
5104 | */ | |
5105 | if (max_stream_size && | |
5106 | ua_chan->attr.subbuf_size > max_stream_size) { | |
5107 | ret = -EINVAL; | |
5108 | DBG3("UST app snapshot record maximum stream size %" PRIu64 | |
5109 | " is smaller than subbuffer size of %" PRIu64, | |
5110 | max_stream_size, ua_chan->attr.subbuf_size); | |
5111 | goto error; | |
5112 | } | |
6dc3064a | 5113 | |
8c924c7b MD |
5114 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, 0, |
5115 | ua_sess->euid, ua_sess->egid, pathname, wait, | |
5116 | max_stream_size); | |
5117 | if (ret < 0) { | |
5118 | goto error; | |
5119 | } | |
5120 | } | |
5121 | ||
5122 | registry = get_session_registry(ua_sess); | |
5123 | assert(registry); | |
5124 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
5125 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, | |
5126 | max_stream_size); | |
5127 | if (ret < 0) { | |
5128 | goto error; | |
5129 | } | |
5130 | } | |
5131 | break; | |
5132 | } | |
5133 | default: | |
5134 | assert(0); | |
5135 | break; | |
6dc3064a DG |
5136 | } |
5137 | ||
5138 | error: | |
5139 | rcu_read_unlock(); | |
5140 | return ret; | |
5141 | } | |
5c786ded JD |
5142 | |
5143 | /* | |
5144 | * Return the number of streams for a UST session. | |
5145 | */ | |
5146 | unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess) | |
5147 | { | |
5148 | unsigned int ret = 0; | |
5149 | struct ust_app *app; | |
5150 | struct lttng_ht_iter iter; | |
5151 | ||
5152 | assert(usess); | |
5153 | ||
5154 | switch (usess->buffer_type) { | |
5155 | case LTTNG_BUFFER_PER_UID: | |
5156 | { | |
5157 | struct buffer_reg_uid *reg; | |
5158 | ||
5159 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5160 | struct buffer_reg_channel *reg_chan; | |
5161 | ||
5162 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5163 | reg_chan, node.node) { | |
5164 | ret += reg_chan->stream_count; | |
5165 | } | |
5166 | } | |
5167 | break; | |
5168 | } | |
5169 | case LTTNG_BUFFER_PER_PID: | |
5170 | { | |
5171 | rcu_read_lock(); | |
5172 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5173 | struct ust_app_channel *ua_chan; | |
5174 | struct ust_app_session *ua_sess; | |
5175 | struct lttng_ht_iter chan_iter; | |
5176 | ||
5177 | ua_sess = lookup_session_by_app(usess, app); | |
5178 | if (!ua_sess) { | |
5179 | /* Session not associated with this app. */ | |
5180 | continue; | |
5181 | } | |
5182 | ||
5183 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5184 | ua_chan, node.node) { | |
5185 | ret += ua_chan->streams.count; | |
5186 | } | |
5187 | } | |
5188 | rcu_read_unlock(); | |
5189 | break; | |
5190 | } | |
5191 | default: | |
5192 | assert(0); | |
5193 | break; | |
5194 | } | |
5195 | ||
5196 | return ret; | |
5197 | } |