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 | } | |
23b66cb8 DG |
481 | |
482 | /* Update back the actual metadata len sent since it failed here. */ | |
483 | pthread_mutex_lock(®istry->lock); | |
484 | registry->metadata_len_sent -= len; | |
485 | pthread_mutex_unlock(®istry->lock); | |
331744e3 JD |
486 | ret_val = ret; |
487 | goto error_push; | |
488 | } | |
489 | ||
490 | free(metadata_str); | |
491 | return len; | |
492 | ||
493 | end: | |
494 | error: | |
495 | pthread_mutex_unlock(®istry->lock); | |
496 | error_push: | |
497 | free(metadata_str); | |
498 | return ret_val; | |
499 | } | |
500 | ||
d88aee68 DG |
501 | /* |
502 | * For a given application and session, push metadata to consumer. The session | |
503 | * lock MUST be acquired here before calling this. | |
331744e3 JD |
504 | * Either sock or consumer is required : if sock is NULL, the default |
505 | * socket to send the metadata is retrieved from consumer, if sock | |
506 | * is not NULL we use it to send the metadata. | |
d88aee68 DG |
507 | * |
508 | * Return 0 on success else a negative error. | |
509 | */ | |
7972aab2 DG |
510 | static int push_metadata(struct ust_registry_session *registry, |
511 | struct consumer_output *consumer) | |
d88aee68 | 512 | { |
331744e3 JD |
513 | int ret_val; |
514 | ssize_t ret; | |
d88aee68 DG |
515 | struct consumer_socket *socket; |
516 | ||
7972aab2 DG |
517 | assert(registry); |
518 | assert(consumer); | |
519 | ||
520 | rcu_read_lock(); | |
d88aee68 | 521 | |
7972aab2 DG |
522 | /* |
523 | * Means that no metadata was assigned to the session. This can happens if | |
524 | * no start has been done previously. | |
525 | */ | |
526 | if (!registry->metadata_key) { | |
331744e3 | 527 | ret_val = 0; |
1b532a60 | 528 | goto end_rcu_unlock; |
d88aee68 DG |
529 | } |
530 | ||
d88aee68 | 531 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
532 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
533 | consumer); | |
d88aee68 | 534 | if (!socket) { |
331744e3 | 535 | ret_val = -1; |
d88aee68 DG |
536 | goto error_rcu_unlock; |
537 | } | |
538 | ||
539 | /* | |
540 | * TODO: Currently, we hold the socket lock around sampling of the next | |
541 | * metadata segment to ensure we send metadata over the consumer socket in | |
542 | * the correct order. This makes the registry lock nest inside the socket | |
543 | * lock. | |
544 | * | |
545 | * Please note that this is a temporary measure: we should move this lock | |
546 | * back into ust_consumer_push_metadata() when the consumer gets the | |
547 | * ability to reorder the metadata it receives. | |
548 | */ | |
549 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
550 | ret = ust_app_push_metadata(registry, socket, 0); |
551 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 552 | if (ret < 0) { |
331744e3 | 553 | ret_val = ret; |
d88aee68 DG |
554 | goto error_rcu_unlock; |
555 | } | |
556 | ||
d88aee68 | 557 | rcu_read_unlock(); |
d88aee68 DG |
558 | return 0; |
559 | ||
d88aee68 | 560 | error_rcu_unlock: |
1b532a60 DG |
561 | /* |
562 | * On error, flag the registry that the metadata is closed. We were unable | |
563 | * to push anything and this means that either the consumer is not | |
564 | * responding or the metadata cache has been destroyed on the consumer. | |
565 | */ | |
566 | registry->metadata_closed = 1; | |
567 | end_rcu_unlock: | |
d88aee68 | 568 | rcu_read_unlock(); |
331744e3 | 569 | return ret_val; |
d88aee68 DG |
570 | } |
571 | ||
572 | /* | |
573 | * Send to the consumer a close metadata command for the given session. Once | |
574 | * done, the metadata channel is deleted and the session metadata pointer is | |
575 | * nullified. The session lock MUST be acquired here unless the application is | |
576 | * in the destroy path. | |
577 | * | |
578 | * Return 0 on success else a negative value. | |
579 | */ | |
7972aab2 DG |
580 | static int close_metadata(struct ust_registry_session *registry, |
581 | struct consumer_output *consumer) | |
d88aee68 DG |
582 | { |
583 | int ret; | |
584 | struct consumer_socket *socket; | |
585 | ||
7972aab2 DG |
586 | assert(registry); |
587 | assert(consumer); | |
d88aee68 | 588 | |
7972aab2 DG |
589 | rcu_read_lock(); |
590 | ||
591 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 | 592 | ret = 0; |
1b532a60 | 593 | goto end; |
d88aee68 DG |
594 | } |
595 | ||
d88aee68 | 596 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
597 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
598 | consumer); | |
d88aee68 DG |
599 | if (!socket) { |
600 | ret = -1; | |
7972aab2 | 601 | goto error; |
d88aee68 DG |
602 | } |
603 | ||
7972aab2 | 604 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 605 | if (ret < 0) { |
7972aab2 | 606 | goto error; |
d88aee68 DG |
607 | } |
608 | ||
d88aee68 | 609 | error: |
1b532a60 DG |
610 | /* |
611 | * Metadata closed. Even on error this means that the consumer is not | |
612 | * responding or not found so either way a second close should NOT be emit | |
613 | * for this registry. | |
614 | */ | |
615 | registry->metadata_closed = 1; | |
616 | end: | |
7972aab2 | 617 | rcu_read_unlock(); |
d88aee68 DG |
618 | return ret; |
619 | } | |
620 | ||
36b588ed MD |
621 | /* |
622 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
623 | * section and outside of call_rcu thread, so we postpone its execution |
624 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
625 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
626 | */ |
627 | static | |
628 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
629 | { | |
630 | struct ust_app_session *ua_sess = | |
631 | caa_container_of(head, struct ust_app_session, rcu_head); | |
632 | ||
0b2dc8df | 633 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
634 | free(ua_sess); |
635 | } | |
636 | ||
d80a6244 DG |
637 | /* |
638 | * Delete ust app session safely. RCU read lock must be held before calling | |
639 | * this function. | |
640 | */ | |
8b366481 | 641 | static |
d0b96690 DG |
642 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
643 | struct ust_app *app) | |
d80a6244 DG |
644 | { |
645 | int ret; | |
bec39940 | 646 | struct lttng_ht_iter iter; |
d80a6244 | 647 | struct ust_app_channel *ua_chan; |
7972aab2 | 648 | struct ust_registry_session *registry; |
d80a6244 | 649 | |
d88aee68 DG |
650 | assert(ua_sess); |
651 | ||
1b532a60 DG |
652 | pthread_mutex_lock(&ua_sess->lock); |
653 | ||
7972aab2 | 654 | registry = get_session_registry(ua_sess); |
1b532a60 | 655 | if (registry && !registry->metadata_closed) { |
d88aee68 | 656 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 657 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 658 | |
7972aab2 DG |
659 | /* |
660 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
661 | * metadata only on destroy trace session in this case. Also, the |
662 | * previous push metadata could have flag the metadata registry to | |
663 | * close so don't send a close command if closed. | |
7972aab2 | 664 | */ |
1b532a60 DG |
665 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
666 | !registry->metadata_closed) { | |
7972aab2 DG |
667 | /* And ask to close it for this session registry. */ |
668 | (void) close_metadata(registry, ua_sess->consumer); | |
669 | } | |
d80a6244 DG |
670 | } |
671 | ||
bec39940 DG |
672 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
673 | node.node) { | |
674 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 675 | assert(!ret); |
d0b96690 | 676 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 677 | } |
d80a6244 | 678 | |
7972aab2 DG |
679 | /* In case of per PID, the registry is kept in the session. */ |
680 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
681 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
682 | if (reg_pid) { | |
683 | buffer_reg_pid_remove(reg_pid); | |
684 | buffer_reg_pid_destroy(reg_pid); | |
685 | } | |
686 | } | |
d0b96690 | 687 | |
aee6bafd | 688 | if (ua_sess->handle != -1) { |
ffe60014 DG |
689 | ret = ustctl_release_handle(sock, ua_sess->handle); |
690 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
691 | ERR("UST app sock %d release session handle failed with ret %d", | |
692 | sock, ret); | |
693 | } | |
aee6bafd | 694 | } |
1b532a60 DG |
695 | pthread_mutex_unlock(&ua_sess->lock); |
696 | ||
36b588ed | 697 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 698 | } |
91d76f53 DG |
699 | |
700 | /* | |
284d8f55 DG |
701 | * Delete a traceable application structure from the global list. Never call |
702 | * this function outside of a call_rcu call. | |
36b588ed MD |
703 | * |
704 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 705 | */ |
8b366481 DG |
706 | static |
707 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 708 | { |
8b366481 | 709 | int ret, sock; |
d42f20df | 710 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 711 | |
d80a6244 | 712 | /* Delete ust app sessions info */ |
852d0037 DG |
713 | sock = app->sock; |
714 | app->sock = -1; | |
d80a6244 | 715 | |
8b366481 | 716 | /* Wipe sessions */ |
d42f20df DG |
717 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
718 | teardown_node) { | |
719 | /* Free every object in the session and the session. */ | |
36b588ed | 720 | rcu_read_lock(); |
d0b96690 | 721 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 722 | rcu_read_unlock(); |
d80a6244 | 723 | } |
36b588ed | 724 | |
0b2dc8df MD |
725 | ht_cleanup_push(app->sessions); |
726 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 727 | |
6414a713 | 728 | /* |
852d0037 DG |
729 | * Wait until we have deleted the application from the sock hash table |
730 | * before closing this socket, otherwise an application could re-use the | |
731 | * socket ID and race with the teardown, using the same hash table entry. | |
732 | * | |
733 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
734 | * all RCU readers that could run concurrently with unregister app, | |
735 | * therefore we _need_ to only close that socket after a grace period. So | |
736 | * it should stay in this RCU callback. | |
737 | * | |
738 | * This close() is a very important step of the synchronization model so | |
739 | * every modification to this function must be carefully reviewed. | |
6414a713 | 740 | */ |
799e2c4f MD |
741 | ret = close(sock); |
742 | if (ret) { | |
743 | PERROR("close"); | |
744 | } | |
4063050c | 745 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 746 | |
852d0037 | 747 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 748 | free(app); |
099e26bd DG |
749 | } |
750 | ||
751 | /* | |
f6a9efaa | 752 | * URCU intermediate call to delete an UST app. |
099e26bd | 753 | */ |
8b366481 DG |
754 | static |
755 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 756 | { |
bec39940 DG |
757 | struct lttng_ht_node_ulong *node = |
758 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 759 | struct ust_app *app = |
852d0037 | 760 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 761 | |
852d0037 | 762 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 763 | delete_ust_app(app); |
099e26bd DG |
764 | } |
765 | ||
ffe60014 DG |
766 | /* |
767 | * Delete the session from the application ht and delete the data structure by | |
768 | * freeing every object inside and releasing them. | |
769 | */ | |
d0b96690 | 770 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
771 | struct ust_app_session *ua_sess) |
772 | { | |
773 | int ret; | |
774 | struct lttng_ht_iter iter; | |
775 | ||
776 | assert(app); | |
777 | assert(ua_sess); | |
778 | ||
779 | iter.iter.node = &ua_sess->node.node; | |
780 | ret = lttng_ht_del(app->sessions, &iter); | |
781 | if (ret) { | |
782 | /* Already scheduled for teardown. */ | |
783 | goto end; | |
784 | } | |
785 | ||
786 | /* Once deleted, free the data structure. */ | |
d0b96690 | 787 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
788 | |
789 | end: | |
790 | return; | |
791 | } | |
792 | ||
8b366481 DG |
793 | /* |
794 | * Alloc new UST app session. | |
795 | */ | |
796 | static | |
d0b96690 | 797 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
798 | { |
799 | struct ust_app_session *ua_sess; | |
800 | ||
801 | /* Init most of the default value by allocating and zeroing */ | |
802 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
803 | if (ua_sess == NULL) { | |
804 | PERROR("malloc"); | |
ffe60014 | 805 | goto error_free; |
8b366481 DG |
806 | } |
807 | ||
808 | ua_sess->handle = -1; | |
bec39940 | 809 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
d0b96690 | 810 | pthread_mutex_init(&ua_sess->lock, NULL); |
ffe60014 | 811 | |
8b366481 DG |
812 | return ua_sess; |
813 | ||
ffe60014 | 814 | error_free: |
8b366481 DG |
815 | return NULL; |
816 | } | |
817 | ||
818 | /* | |
819 | * Alloc new UST app channel. | |
820 | */ | |
821 | static | |
822 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 823 | struct ust_app_session *ua_sess, |
ffe60014 | 824 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
825 | { |
826 | struct ust_app_channel *ua_chan; | |
827 | ||
828 | /* Init most of the default value by allocating and zeroing */ | |
829 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
830 | if (ua_chan == NULL) { | |
831 | PERROR("malloc"); | |
832 | goto error; | |
833 | } | |
834 | ||
835 | /* Setup channel name */ | |
836 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
837 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
838 | ||
839 | ua_chan->enabled = 1; | |
840 | ua_chan->handle = -1; | |
45893984 | 841 | ua_chan->session = ua_sess; |
ffe60014 | 842 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
843 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
844 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
845 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
846 | |
847 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 848 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
849 | |
850 | /* Copy attributes */ | |
851 | if (attr) { | |
ffe60014 | 852 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
853 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
854 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
855 | ua_chan->attr.overwrite = attr->overwrite; | |
856 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
857 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
858 | ua_chan->attr.output = attr->output; | |
8b366481 | 859 | } |
ffe60014 DG |
860 | /* By default, the channel is a per cpu channel. */ |
861 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
862 | |
863 | DBG3("UST app channel %s allocated", ua_chan->name); | |
864 | ||
865 | return ua_chan; | |
866 | ||
867 | error: | |
868 | return NULL; | |
869 | } | |
870 | ||
37f1c236 DG |
871 | /* |
872 | * Allocate and initialize a UST app stream. | |
873 | * | |
874 | * Return newly allocated stream pointer or NULL on error. | |
875 | */ | |
ffe60014 | 876 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
877 | { |
878 | struct ust_app_stream *stream = NULL; | |
879 | ||
880 | stream = zmalloc(sizeof(*stream)); | |
881 | if (stream == NULL) { | |
882 | PERROR("zmalloc ust app stream"); | |
883 | goto error; | |
884 | } | |
885 | ||
886 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
887 | stream->handle = -1; | |
888 | ||
889 | error: | |
890 | return stream; | |
891 | } | |
892 | ||
8b366481 DG |
893 | /* |
894 | * Alloc new UST app event. | |
895 | */ | |
896 | static | |
897 | struct ust_app_event *alloc_ust_app_event(char *name, | |
898 | struct lttng_ust_event *attr) | |
899 | { | |
900 | struct ust_app_event *ua_event; | |
901 | ||
902 | /* Init most of the default value by allocating and zeroing */ | |
903 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
904 | if (ua_event == NULL) { | |
905 | PERROR("malloc"); | |
906 | goto error; | |
907 | } | |
908 | ||
909 | ua_event->enabled = 1; | |
910 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
911 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 912 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
913 | |
914 | /* Copy attributes */ | |
915 | if (attr) { | |
916 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
917 | } | |
918 | ||
919 | DBG3("UST app event %s allocated", ua_event->name); | |
920 | ||
921 | return ua_event; | |
922 | ||
923 | error: | |
924 | return NULL; | |
925 | } | |
926 | ||
927 | /* | |
928 | * Alloc new UST app context. | |
929 | */ | |
930 | static | |
931 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
932 | { | |
933 | struct ust_app_ctx *ua_ctx; | |
934 | ||
935 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
936 | if (ua_ctx == NULL) { | |
937 | goto error; | |
938 | } | |
939 | ||
31746f93 DG |
940 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
941 | ||
8b366481 DG |
942 | if (uctx) { |
943 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
944 | } | |
945 | ||
946 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
947 | ||
948 | error: | |
949 | return ua_ctx; | |
950 | } | |
951 | ||
025faf73 DG |
952 | /* |
953 | * Allocate a filter and copy the given original filter. | |
954 | * | |
955 | * Return allocated filter or NULL on error. | |
956 | */ | |
957 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
958 | struct lttng_ust_filter_bytecode *orig_f) | |
959 | { | |
960 | struct lttng_ust_filter_bytecode *filter = NULL; | |
961 | ||
962 | /* Copy filter bytecode */ | |
963 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
964 | if (!filter) { | |
965 | PERROR("zmalloc alloc ust app filter"); | |
966 | goto error; | |
967 | } | |
968 | ||
969 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
970 | ||
971 | error: | |
972 | return filter; | |
973 | } | |
974 | ||
099e26bd | 975 | /* |
421cb601 DG |
976 | * Find an ust_app using the sock and return it. RCU read side lock must be |
977 | * held before calling this helper function. | |
099e26bd | 978 | */ |
8b366481 DG |
979 | static |
980 | struct ust_app *find_app_by_sock(int sock) | |
099e26bd | 981 | { |
bec39940 | 982 | struct lttng_ht_node_ulong *node; |
bec39940 | 983 | struct lttng_ht_iter iter; |
f6a9efaa | 984 | |
852d0037 | 985 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 986 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
987 | if (node == NULL) { |
988 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
989 | goto error; |
990 | } | |
852d0037 DG |
991 | |
992 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
993 | |
994 | error: | |
995 | return NULL; | |
099e26bd DG |
996 | } |
997 | ||
d0b96690 DG |
998 | /* |
999 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1000 | * be held before calling this helper function. | |
1001 | */ | |
1002 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1003 | { | |
1004 | struct lttng_ht_node_ulong *node; | |
1005 | struct lttng_ht_iter iter; | |
1006 | ||
1007 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1008 | &iter); | |
1009 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1010 | if (node == NULL) { | |
1011 | DBG2("UST app find by notify sock %d not found", sock); | |
1012 | goto error; | |
1013 | } | |
1014 | ||
1015 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1016 | ||
1017 | error: | |
1018 | return NULL; | |
1019 | } | |
1020 | ||
025faf73 DG |
1021 | /* |
1022 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1023 | * event loglevel. | |
1024 | * | |
1025 | * Return an ust_app_event object or NULL on error. | |
1026 | */ | |
18eace3b DG |
1027 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
1028 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel) | |
1029 | { | |
1030 | struct lttng_ht_iter iter; | |
1031 | struct lttng_ht_node_str *node; | |
1032 | struct ust_app_event *event = NULL; | |
1033 | struct ust_app_ht_key key; | |
18eace3b DG |
1034 | |
1035 | assert(name); | |
1036 | assert(ht); | |
1037 | ||
1038 | /* Setup key for event lookup. */ | |
1039 | key.name = name; | |
1040 | key.filter = filter; | |
1041 | key.loglevel = loglevel; | |
1042 | ||
025faf73 DG |
1043 | /* Lookup using the event name as hash and a custom match fct. */ |
1044 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1045 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1046 | node = lttng_ht_iter_get_node_str(&iter); |
1047 | if (node == NULL) { | |
1048 | goto end; | |
1049 | } | |
1050 | ||
1051 | event = caa_container_of(node, struct ust_app_event, node); | |
1052 | ||
1053 | end: | |
18eace3b DG |
1054 | return event; |
1055 | } | |
1056 | ||
55cc08a6 DG |
1057 | /* |
1058 | * Create the channel context on the tracer. | |
d0b96690 DG |
1059 | * |
1060 | * Called with UST app session lock held. | |
55cc08a6 DG |
1061 | */ |
1062 | static | |
1063 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1064 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1065 | { | |
1066 | int ret; | |
1067 | ||
840cb59c | 1068 | health_code_update(); |
86acf0da | 1069 | |
852d0037 | 1070 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1071 | ua_chan->obj, &ua_ctx->obj); |
1072 | if (ret < 0) { | |
ffe60014 DG |
1073 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1074 | ERR("UST app create channel context failed for app (pid: %d) " | |
1075 | "with ret %d", app->pid, ret); | |
1076 | } else { | |
3757b385 DG |
1077 | /* |
1078 | * This is normal behavior, an application can die during the | |
1079 | * creation process. Don't report an error so the execution can | |
1080 | * continue normally. | |
1081 | */ | |
1082 | ret = 0; | |
ffe60014 DG |
1083 | DBG3("UST app disable event failed. Application is dead."); |
1084 | } | |
55cc08a6 DG |
1085 | goto error; |
1086 | } | |
1087 | ||
1088 | ua_ctx->handle = ua_ctx->obj->handle; | |
1089 | ||
d0b96690 DG |
1090 | DBG2("UST app context handle %d created successfully for channel %s", |
1091 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1092 | |
1093 | error: | |
840cb59c | 1094 | health_code_update(); |
55cc08a6 DG |
1095 | return ret; |
1096 | } | |
1097 | ||
53a80697 MD |
1098 | /* |
1099 | * Set the filter on the tracer. | |
1100 | */ | |
1101 | static | |
1102 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1103 | struct ust_app *app) | |
1104 | { | |
1105 | int ret; | |
1106 | ||
840cb59c | 1107 | health_code_update(); |
86acf0da | 1108 | |
53a80697 | 1109 | if (!ua_event->filter) { |
86acf0da DG |
1110 | ret = 0; |
1111 | goto error; | |
53a80697 MD |
1112 | } |
1113 | ||
1114 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1115 | ua_event->obj); | |
1116 | if (ret < 0) { | |
ffe60014 DG |
1117 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1118 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1119 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1120 | } else { | |
3757b385 DG |
1121 | /* |
1122 | * This is normal behavior, an application can die during the | |
1123 | * creation process. Don't report an error so the execution can | |
1124 | * continue normally. | |
1125 | */ | |
1126 | ret = 0; | |
ffe60014 DG |
1127 | DBG3("UST app filter event failed. Application is dead."); |
1128 | } | |
53a80697 MD |
1129 | goto error; |
1130 | } | |
1131 | ||
1132 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1133 | ||
1134 | error: | |
840cb59c | 1135 | health_code_update(); |
53a80697 MD |
1136 | return ret; |
1137 | } | |
1138 | ||
9730260e DG |
1139 | /* |
1140 | * Disable the specified event on to UST tracer for the UST session. | |
1141 | */ | |
1142 | static int disable_ust_event(struct ust_app *app, | |
1143 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1144 | { | |
1145 | int ret; | |
1146 | ||
840cb59c | 1147 | health_code_update(); |
86acf0da | 1148 | |
852d0037 | 1149 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1150 | if (ret < 0) { |
ffe60014 DG |
1151 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1152 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1153 | "and session handle %d with ret %d", | |
1154 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1155 | } else { | |
3757b385 DG |
1156 | /* |
1157 | * This is normal behavior, an application can die during the | |
1158 | * creation process. Don't report an error so the execution can | |
1159 | * continue normally. | |
1160 | */ | |
1161 | ret = 0; | |
ffe60014 DG |
1162 | DBG3("UST app disable event failed. Application is dead."); |
1163 | } | |
9730260e DG |
1164 | goto error; |
1165 | } | |
1166 | ||
1167 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1168 | ua_event->attr.name, app->pid); |
9730260e DG |
1169 | |
1170 | error: | |
840cb59c | 1171 | health_code_update(); |
9730260e DG |
1172 | return ret; |
1173 | } | |
1174 | ||
78f0bacd DG |
1175 | /* |
1176 | * Disable the specified channel on to UST tracer for the UST session. | |
1177 | */ | |
1178 | static int disable_ust_channel(struct ust_app *app, | |
1179 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1180 | { | |
1181 | int ret; | |
1182 | ||
840cb59c | 1183 | health_code_update(); |
86acf0da | 1184 | |
852d0037 | 1185 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1186 | if (ret < 0) { |
ffe60014 DG |
1187 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1188 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1189 | "and session handle %d with ret %d", | |
1190 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1191 | } else { | |
3757b385 DG |
1192 | /* |
1193 | * This is normal behavior, an application can die during the | |
1194 | * creation process. Don't report an error so the execution can | |
1195 | * continue normally. | |
1196 | */ | |
1197 | ret = 0; | |
ffe60014 DG |
1198 | DBG3("UST app disable channel failed. Application is dead."); |
1199 | } | |
78f0bacd DG |
1200 | goto error; |
1201 | } | |
1202 | ||
78f0bacd | 1203 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1204 | ua_chan->name, app->pid); |
78f0bacd DG |
1205 | |
1206 | error: | |
840cb59c | 1207 | health_code_update(); |
78f0bacd DG |
1208 | return ret; |
1209 | } | |
1210 | ||
1211 | /* | |
1212 | * Enable the specified channel on to UST tracer for the UST session. | |
1213 | */ | |
1214 | static int enable_ust_channel(struct ust_app *app, | |
1215 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1216 | { | |
1217 | int ret; | |
1218 | ||
840cb59c | 1219 | health_code_update(); |
86acf0da | 1220 | |
852d0037 | 1221 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1222 | if (ret < 0) { |
ffe60014 DG |
1223 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1224 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1225 | "and session handle %d with ret %d", | |
1226 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1227 | } else { | |
3757b385 DG |
1228 | /* |
1229 | * This is normal behavior, an application can die during the | |
1230 | * creation process. Don't report an error so the execution can | |
1231 | * continue normally. | |
1232 | */ | |
1233 | ret = 0; | |
ffe60014 DG |
1234 | DBG3("UST app enable channel failed. Application is dead."); |
1235 | } | |
78f0bacd DG |
1236 | goto error; |
1237 | } | |
1238 | ||
1239 | ua_chan->enabled = 1; | |
1240 | ||
1241 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1242 | ua_chan->name, app->pid); |
78f0bacd DG |
1243 | |
1244 | error: | |
840cb59c | 1245 | health_code_update(); |
78f0bacd DG |
1246 | return ret; |
1247 | } | |
1248 | ||
edb67388 DG |
1249 | /* |
1250 | * Enable the specified event on to UST tracer for the UST session. | |
1251 | */ | |
1252 | static int enable_ust_event(struct ust_app *app, | |
1253 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1254 | { | |
1255 | int ret; | |
1256 | ||
840cb59c | 1257 | health_code_update(); |
86acf0da | 1258 | |
852d0037 | 1259 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1260 | if (ret < 0) { |
ffe60014 DG |
1261 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1262 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1263 | "and session handle %d with ret %d", | |
1264 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1265 | } else { | |
3757b385 DG |
1266 | /* |
1267 | * This is normal behavior, an application can die during the | |
1268 | * creation process. Don't report an error so the execution can | |
1269 | * continue normally. | |
1270 | */ | |
1271 | ret = 0; | |
ffe60014 DG |
1272 | DBG3("UST app enable event failed. Application is dead."); |
1273 | } | |
edb67388 DG |
1274 | goto error; |
1275 | } | |
1276 | ||
1277 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1278 | ua_event->attr.name, app->pid); |
edb67388 DG |
1279 | |
1280 | error: | |
840cb59c | 1281 | health_code_update(); |
edb67388 DG |
1282 | return ret; |
1283 | } | |
1284 | ||
099e26bd | 1285 | /* |
7972aab2 | 1286 | * Send channel and stream buffer to application. |
4f3ab6ee | 1287 | * |
ffe60014 | 1288 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1289 | */ |
7972aab2 DG |
1290 | static int send_channel_pid_to_ust(struct ust_app *app, |
1291 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1292 | { |
1293 | int ret; | |
ffe60014 | 1294 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1295 | |
1296 | assert(app); | |
ffe60014 | 1297 | assert(ua_sess); |
4f3ab6ee | 1298 | assert(ua_chan); |
4f3ab6ee | 1299 | |
840cb59c | 1300 | health_code_update(); |
4f3ab6ee | 1301 | |
7972aab2 DG |
1302 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1303 | app->sock); | |
86acf0da | 1304 | |
ffe60014 DG |
1305 | /* Send channel to the application. */ |
1306 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1307 | if (ret < 0) { |
b551a063 DG |
1308 | goto error; |
1309 | } | |
1310 | ||
d88aee68 DG |
1311 | health_code_update(); |
1312 | ||
ffe60014 DG |
1313 | /* Send all streams to application. */ |
1314 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1315 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1316 | if (ret < 0) { | |
1317 | goto error; | |
1318 | } | |
1319 | /* We don't need the stream anymore once sent to the tracer. */ | |
1320 | cds_list_del(&stream->list); | |
1321 | delete_ust_app_stream(-1, stream); | |
1322 | } | |
ffe60014 DG |
1323 | /* Flag the channel that it is sent to the application. */ |
1324 | ua_chan->is_sent = 1; | |
ffe60014 | 1325 | |
b551a063 | 1326 | error: |
840cb59c | 1327 | health_code_update(); |
b551a063 DG |
1328 | return ret; |
1329 | } | |
1330 | ||
91d76f53 | 1331 | /* |
5b4a0ec0 | 1332 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1333 | * |
1334 | * Should be called with session mutex held. | |
91d76f53 | 1335 | */ |
edb67388 DG |
1336 | static |
1337 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1338 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1339 | { |
5b4a0ec0 | 1340 | int ret = 0; |
284d8f55 | 1341 | |
840cb59c | 1342 | health_code_update(); |
86acf0da | 1343 | |
5b4a0ec0 | 1344 | /* Create UST event on tracer */ |
852d0037 | 1345 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1346 | &ua_event->obj); |
1347 | if (ret < 0) { | |
ffe60014 DG |
1348 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1349 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1350 | ua_event->attr.name, app->pid, ret); | |
1351 | } else { | |
3757b385 DG |
1352 | /* |
1353 | * This is normal behavior, an application can die during the | |
1354 | * creation process. Don't report an error so the execution can | |
1355 | * continue normally. | |
1356 | */ | |
1357 | ret = 0; | |
ffe60014 DG |
1358 | DBG3("UST app create event failed. Application is dead."); |
1359 | } | |
5b4a0ec0 | 1360 | goto error; |
91d76f53 | 1361 | } |
f6a9efaa | 1362 | |
5b4a0ec0 | 1363 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1364 | |
5b4a0ec0 | 1365 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1366 | ua_event->attr.name, app->pid); |
f6a9efaa | 1367 | |
840cb59c | 1368 | health_code_update(); |
86acf0da | 1369 | |
025faf73 DG |
1370 | /* Set filter if one is present. */ |
1371 | if (ua_event->filter) { | |
1372 | ret = set_ust_event_filter(ua_event, app); | |
1373 | if (ret < 0) { | |
1374 | goto error; | |
1375 | } | |
1376 | } | |
1377 | ||
8535a6d9 | 1378 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 1379 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
1380 | ret = disable_ust_event(app, ua_sess, ua_event); |
1381 | if (ret < 0) { | |
fc34caaa DG |
1382 | /* |
1383 | * If we hit an EPERM, something is wrong with our disable call. If | |
1384 | * we get an EEXIST, there is a problem on the tracer side since we | |
1385 | * just created it. | |
1386 | */ | |
1387 | switch (ret) { | |
49c336c1 | 1388 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1389 | /* Code flow problem */ |
1390 | assert(0); | |
49c336c1 | 1391 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1392 | /* It's OK for our use case. */ |
1393 | ret = 0; | |
1394 | break; | |
1395 | default: | |
1396 | break; | |
1397 | } | |
8535a6d9 DG |
1398 | goto error; |
1399 | } | |
1400 | } | |
1401 | ||
5b4a0ec0 | 1402 | error: |
840cb59c | 1403 | health_code_update(); |
5b4a0ec0 | 1404 | return ret; |
91d76f53 | 1405 | } |
48842b30 | 1406 | |
5b4a0ec0 DG |
1407 | /* |
1408 | * Copy data between an UST app event and a LTT event. | |
1409 | */ | |
421cb601 | 1410 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1411 | struct ltt_ust_event *uevent) |
1412 | { | |
1413 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); | |
1414 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1415 | ||
fc34caaa DG |
1416 | ua_event->enabled = uevent->enabled; |
1417 | ||
5b4a0ec0 DG |
1418 | /* Copy event attributes */ |
1419 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1420 | ||
53a80697 MD |
1421 | /* Copy filter bytecode */ |
1422 | if (uevent->filter) { | |
025faf73 DG |
1423 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1424 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1425 | } |
48842b30 DG |
1426 | } |
1427 | ||
5b4a0ec0 DG |
1428 | /* |
1429 | * Copy data between an UST app channel and a LTT channel. | |
1430 | */ | |
421cb601 | 1431 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1432 | struct ltt_ust_channel *uchan) |
1433 | { | |
bec39940 | 1434 | struct lttng_ht_iter iter; |
48842b30 | 1435 | struct ltt_ust_event *uevent; |
55cc08a6 | 1436 | struct ltt_ust_context *uctx; |
48842b30 | 1437 | struct ust_app_event *ua_event; |
55cc08a6 | 1438 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1439 | |
fc34caaa | 1440 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1441 | |
1442 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1443 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1444 | |
1624d5b7 JD |
1445 | ua_chan->tracefile_size = uchan->tracefile_size; |
1446 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1447 | ||
ffe60014 DG |
1448 | /* Copy event attributes since the layout is different. */ |
1449 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1450 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1451 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1452 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1453 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1454 | ua_chan->attr.output = uchan->attr.output; | |
1455 | /* | |
1456 | * Note that the attribute channel type is not set since the channel on the | |
1457 | * tracing registry side does not have this information. | |
1458 | */ | |
48842b30 | 1459 | |
fc34caaa | 1460 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1461 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1462 | |
31746f93 | 1463 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1464 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1465 | if (ua_ctx == NULL) { | |
1466 | continue; | |
1467 | } | |
bec39940 DG |
1468 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1469 | (unsigned long) ua_ctx->ctx.ctx); | |
1470 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
31746f93 | 1471 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1472 | } |
48842b30 | 1473 | |
421cb601 | 1474 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1475 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b DG |
1476 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
1477 | uevent->filter, uevent->attr.loglevel); | |
1478 | if (ua_event == NULL) { | |
421cb601 | 1479 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1480 | uevent->attr.name); |
284d8f55 | 1481 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1482 | if (ua_event == NULL) { |
5b4a0ec0 | 1483 | continue; |
48842b30 | 1484 | } |
421cb601 | 1485 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1486 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1487 | } |
48842b30 DG |
1488 | } |
1489 | ||
fc34caaa | 1490 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1491 | } |
1492 | ||
5b4a0ec0 DG |
1493 | /* |
1494 | * Copy data between a UST app session and a regular LTT session. | |
1495 | */ | |
421cb601 | 1496 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1497 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1498 | { |
bec39940 DG |
1499 | struct lttng_ht_node_str *ua_chan_node; |
1500 | struct lttng_ht_iter iter; | |
48842b30 DG |
1501 | struct ltt_ust_channel *uchan; |
1502 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1503 | time_t rawtime; |
1504 | struct tm *timeinfo; | |
1505 | char datetime[16]; | |
1506 | int ret; | |
1507 | ||
1508 | /* Get date and time for unique app path */ | |
1509 | time(&rawtime); | |
1510 | timeinfo = localtime(&rawtime); | |
1511 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1512 | |
421cb601 | 1513 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1514 | |
7972aab2 DG |
1515 | ua_sess->tracing_id = usess->id; |
1516 | ua_sess->id = get_next_session_id(); | |
1517 | ua_sess->uid = app->uid; | |
1518 | ua_sess->gid = app->gid; | |
1519 | ua_sess->euid = usess->uid; | |
1520 | ua_sess->egid = usess->gid; | |
1521 | ua_sess->buffer_type = usess->buffer_type; | |
1522 | ua_sess->bits_per_long = app->bits_per_long; | |
1523 | /* There is only one consumer object per session possible. */ | |
1524 | ua_sess->consumer = usess->consumer; | |
2bba9e53 | 1525 | ua_sess->output_traces = usess->output_traces; |
7972aab2 DG |
1526 | |
1527 | switch (ua_sess->buffer_type) { | |
1528 | case LTTNG_BUFFER_PER_PID: | |
1529 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1530 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1531 | datetime); |
1532 | break; | |
1533 | case LTTNG_BUFFER_PER_UID: | |
1534 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1535 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1536 | break; | |
1537 | default: | |
1538 | assert(0); | |
1539 | goto error; | |
1540 | } | |
477d7741 MD |
1541 | if (ret < 0) { |
1542 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1543 | assert(0); |
7972aab2 | 1544 | goto error; |
477d7741 MD |
1545 | } |
1546 | ||
48842b30 | 1547 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1548 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1549 | uchan, node.node) { | |
1550 | struct lttng_ht_iter uiter; | |
ba767faf | 1551 | |
bec39940 DG |
1552 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1553 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1554 | if (ua_chan_node != NULL) { |
fc34caaa | 1555 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1556 | continue; |
1557 | } | |
421cb601 | 1558 | |
5b4a0ec0 DG |
1559 | DBG2("Channel %s not found on shadow session copy, creating it", |
1560 | uchan->name); | |
d0b96690 | 1561 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1562 | if (ua_chan == NULL) { |
fc34caaa | 1563 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1564 | continue; |
48842b30 | 1565 | } |
5b4a0ec0 | 1566 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1567 | /* |
1568 | * The concept of metadata channel does not exist on the tracing | |
1569 | * registry side of the session daemon so this can only be a per CPU | |
1570 | * channel and not metadata. | |
1571 | */ | |
1572 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1573 | ||
bec39940 | 1574 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1575 | } |
7972aab2 DG |
1576 | |
1577 | error: | |
1578 | return; | |
48842b30 DG |
1579 | } |
1580 | ||
78f0bacd DG |
1581 | /* |
1582 | * Lookup sesison wrapper. | |
1583 | */ | |
84cd17c6 MD |
1584 | static |
1585 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1586 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1587 | { |
1588 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1589 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1590 | } |
1591 | ||
421cb601 DG |
1592 | /* |
1593 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1594 | * id. |
421cb601 | 1595 | */ |
48842b30 DG |
1596 | static struct ust_app_session *lookup_session_by_app( |
1597 | struct ltt_ust_session *usess, struct ust_app *app) | |
1598 | { | |
bec39940 | 1599 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1600 | struct lttng_ht_node_u64 *node; |
48842b30 | 1601 | |
84cd17c6 | 1602 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1603 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1604 | if (node == NULL) { |
1605 | goto error; | |
1606 | } | |
1607 | ||
1608 | return caa_container_of(node, struct ust_app_session, node); | |
1609 | ||
1610 | error: | |
1611 | return NULL; | |
1612 | } | |
1613 | ||
7972aab2 DG |
1614 | /* |
1615 | * Setup buffer registry per PID for the given session and application. If none | |
1616 | * is found, a new one is created, added to the global registry and | |
1617 | * initialized. If regp is valid, it's set with the newly created object. | |
1618 | * | |
1619 | * Return 0 on success or else a negative value. | |
1620 | */ | |
1621 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1622 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1623 | { | |
1624 | int ret = 0; | |
1625 | struct buffer_reg_pid *reg_pid; | |
1626 | ||
1627 | assert(ua_sess); | |
1628 | assert(app); | |
1629 | ||
1630 | rcu_read_lock(); | |
1631 | ||
1632 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1633 | if (!reg_pid) { | |
1634 | /* | |
1635 | * This is the create channel path meaning that if there is NO | |
1636 | * registry available, we have to create one for this session. | |
1637 | */ | |
1638 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1639 | if (ret < 0) { | |
1640 | goto error; | |
1641 | } | |
1642 | buffer_reg_pid_add(reg_pid); | |
1643 | } else { | |
1644 | goto end; | |
1645 | } | |
1646 | ||
1647 | /* Initialize registry. */ | |
1648 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1649 | app->bits_per_long, app->uint8_t_alignment, | |
1650 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1651 | app->uint64_t_alignment, app->long_alignment, |
1652 | app->byte_order, app->version.major, | |
1653 | app->version.minor); | |
7972aab2 DG |
1654 | if (ret < 0) { |
1655 | goto error; | |
1656 | } | |
1657 | ||
1658 | DBG3("UST app buffer registry per PID created successfully"); | |
1659 | ||
1660 | end: | |
1661 | if (regp) { | |
1662 | *regp = reg_pid; | |
1663 | } | |
1664 | error: | |
1665 | rcu_read_unlock(); | |
1666 | return ret; | |
1667 | } | |
1668 | ||
1669 | /* | |
1670 | * Setup buffer registry per UID for the given session and application. If none | |
1671 | * is found, a new one is created, added to the global registry and | |
1672 | * initialized. If regp is valid, it's set with the newly created object. | |
1673 | * | |
1674 | * Return 0 on success or else a negative value. | |
1675 | */ | |
1676 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1677 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1678 | { | |
1679 | int ret = 0; | |
1680 | struct buffer_reg_uid *reg_uid; | |
1681 | ||
1682 | assert(usess); | |
1683 | assert(app); | |
1684 | ||
1685 | rcu_read_lock(); | |
1686 | ||
1687 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1688 | if (!reg_uid) { | |
1689 | /* | |
1690 | * This is the create channel path meaning that if there is NO | |
1691 | * registry available, we have to create one for this session. | |
1692 | */ | |
1693 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1694 | LTTNG_DOMAIN_UST, ®_uid); | |
1695 | if (ret < 0) { | |
1696 | goto error; | |
1697 | } | |
1698 | buffer_reg_uid_add(reg_uid); | |
1699 | } else { | |
1700 | goto end; | |
1701 | } | |
1702 | ||
1703 | /* Initialize registry. */ | |
af6142cf | 1704 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1705 | app->bits_per_long, app->uint8_t_alignment, |
1706 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1707 | app->uint64_t_alignment, app->long_alignment, |
1708 | app->byte_order, app->version.major, | |
1709 | app->version.minor); | |
7972aab2 DG |
1710 | if (ret < 0) { |
1711 | goto error; | |
1712 | } | |
1713 | /* Add node to teardown list of the session. */ | |
1714 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1715 | ||
1716 | DBG3("UST app buffer registry per UID created successfully"); | |
1717 | ||
1718 | end: | |
1719 | if (regp) { | |
1720 | *regp = reg_uid; | |
1721 | } | |
1722 | error: | |
1723 | rcu_read_unlock(); | |
1724 | return ret; | |
1725 | } | |
1726 | ||
421cb601 | 1727 | /* |
3d8ca23b | 1728 | * Create a session on the tracer side for the given app. |
421cb601 | 1729 | * |
3d8ca23b DG |
1730 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1731 | * untouched. If the session was created, is_created is set to 1. On error, | |
1732 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1733 | * be NULL. | |
1734 | * | |
1735 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1736 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1737 | */ |
3d8ca23b DG |
1738 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1739 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1740 | int *is_created) | |
421cb601 | 1741 | { |
3d8ca23b | 1742 | int ret, created = 0; |
421cb601 DG |
1743 | struct ust_app_session *ua_sess; |
1744 | ||
3d8ca23b DG |
1745 | assert(usess); |
1746 | assert(app); | |
1747 | assert(ua_sess_ptr); | |
1748 | ||
840cb59c | 1749 | health_code_update(); |
86acf0da | 1750 | |
421cb601 DG |
1751 | ua_sess = lookup_session_by_app(usess, app); |
1752 | if (ua_sess == NULL) { | |
d9bf3ca4 | 1753 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1754 | app->pid, usess->id); |
d0b96690 | 1755 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1756 | if (ua_sess == NULL) { |
1757 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1758 | ret = -ENOMEM; |
1759 | goto error; | |
421cb601 | 1760 | } |
477d7741 | 1761 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1762 | created = 1; |
421cb601 DG |
1763 | } |
1764 | ||
7972aab2 DG |
1765 | switch (usess->buffer_type) { |
1766 | case LTTNG_BUFFER_PER_PID: | |
1767 | /* Init local registry. */ | |
1768 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1769 | if (ret < 0) { |
7972aab2 DG |
1770 | goto error; |
1771 | } | |
1772 | break; | |
1773 | case LTTNG_BUFFER_PER_UID: | |
1774 | /* Look for a global registry. If none exists, create one. */ | |
1775 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1776 | if (ret < 0) { | |
1777 | goto error; | |
1778 | } | |
1779 | break; | |
1780 | default: | |
1781 | assert(0); | |
1782 | ret = -EINVAL; | |
1783 | goto error; | |
1784 | } | |
1785 | ||
1786 | health_code_update(); | |
1787 | ||
1788 | if (ua_sess->handle == -1) { | |
1789 | ret = ustctl_create_session(app->sock); | |
1790 | if (ret < 0) { | |
1791 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1792 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1793 | app->pid, ret); |
1794 | } else { | |
1795 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
1796 | /* |
1797 | * This is normal behavior, an application can die during the | |
1798 | * creation process. Don't report an error so the execution can | |
1799 | * continue normally. This will get flagged ENOTCONN and the | |
1800 | * caller will handle it. | |
1801 | */ | |
1802 | ret = 0; | |
ffe60014 | 1803 | } |
d0b96690 | 1804 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1805 | if (ret != -ENOMEM) { |
1806 | /* | |
1807 | * Tracer is probably gone or got an internal error so let's | |
1808 | * behave like it will soon unregister or not usable. | |
1809 | */ | |
1810 | ret = -ENOTCONN; | |
1811 | } | |
1812 | goto error; | |
421cb601 DG |
1813 | } |
1814 | ||
7972aab2 DG |
1815 | ua_sess->handle = ret; |
1816 | ||
1817 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
1818 | lttng_ht_node_init_u64(&ua_sess->node, |
1819 | ua_sess->tracing_id); | |
1820 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1821 | |
1822 | DBG2("UST app session created successfully with handle %d", ret); | |
1823 | } | |
1824 | ||
1825 | *ua_sess_ptr = ua_sess; | |
1826 | if (is_created) { | |
1827 | *is_created = created; | |
1828 | } | |
1829 | ||
1830 | /* Everything went well. */ | |
1831 | ret = 0; | |
1832 | ||
1833 | error: | |
1834 | health_code_update(); | |
1835 | return ret; | |
1836 | } | |
1837 | ||
1838 | /* | |
1839 | * Create a context for the channel on the tracer. | |
1840 | * | |
1841 | * Called with UST app session lock held and a RCU read side lock. | |
1842 | */ | |
1843 | static | |
1844 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1845 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1846 | struct ust_app *app) | |
1847 | { | |
1848 | int ret = 0; | |
1849 | struct lttng_ht_iter iter; | |
1850 | struct lttng_ht_node_ulong *node; | |
1851 | struct ust_app_ctx *ua_ctx; | |
1852 | ||
1853 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1854 | ||
1855 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); | |
1856 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1857 | if (node != NULL) { | |
1858 | ret = -EEXIST; | |
1859 | goto error; | |
1860 | } | |
1861 | ||
1862 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1863 | if (ua_ctx == NULL) { | |
1864 | /* malloc failed */ | |
1865 | ret = -1; | |
1866 | goto error; | |
1867 | } | |
1868 | ||
1869 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
1870 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
31746f93 | 1871 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
1872 | |
1873 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1874 | if (ret < 0) { | |
1875 | goto error; | |
1876 | } | |
1877 | ||
1878 | error: | |
1879 | return ret; | |
1880 | } | |
1881 | ||
1882 | /* | |
1883 | * Enable on the tracer side a ust app event for the session and channel. | |
1884 | * | |
1885 | * Called with UST app session lock held. | |
1886 | */ | |
1887 | static | |
1888 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
1889 | struct ust_app_event *ua_event, struct ust_app *app) | |
1890 | { | |
1891 | int ret; | |
1892 | ||
1893 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1894 | if (ret < 0) { | |
1895 | goto error; | |
1896 | } | |
1897 | ||
1898 | ua_event->enabled = 1; | |
1899 | ||
1900 | error: | |
1901 | return ret; | |
1902 | } | |
1903 | ||
1904 | /* | |
1905 | * Disable on the tracer side a ust app event for the session and channel. | |
1906 | */ | |
1907 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
1908 | struct ust_app_event *ua_event, struct ust_app *app) | |
1909 | { | |
1910 | int ret; | |
1911 | ||
1912 | ret = disable_ust_event(app, ua_sess, ua_event); | |
1913 | if (ret < 0) { | |
1914 | goto error; | |
1915 | } | |
1916 | ||
1917 | ua_event->enabled = 0; | |
1918 | ||
1919 | error: | |
1920 | return ret; | |
1921 | } | |
1922 | ||
1923 | /* | |
1924 | * Lookup ust app channel for session and disable it on the tracer side. | |
1925 | */ | |
1926 | static | |
1927 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
1928 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
1929 | { | |
1930 | int ret; | |
1931 | ||
1932 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
1933 | if (ret < 0) { | |
1934 | goto error; | |
1935 | } | |
1936 | ||
1937 | ua_chan->enabled = 0; | |
1938 | ||
1939 | error: | |
1940 | return ret; | |
1941 | } | |
1942 | ||
1943 | /* | |
1944 | * Lookup ust app channel for session and enable it on the tracer side. This | |
1945 | * MUST be called with a RCU read side lock acquired. | |
1946 | */ | |
1947 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
1948 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
1949 | { | |
1950 | int ret = 0; | |
1951 | struct lttng_ht_iter iter; | |
1952 | struct lttng_ht_node_str *ua_chan_node; | |
1953 | struct ust_app_channel *ua_chan; | |
1954 | ||
1955 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
1956 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
1957 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 1958 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
1959 | uchan->name, ua_sess->tracing_id); |
1960 | goto error; | |
1961 | } | |
1962 | ||
1963 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
1964 | ||
1965 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
1966 | if (ret < 0) { | |
1967 | goto error; | |
1968 | } | |
1969 | ||
1970 | error: | |
1971 | return ret; | |
1972 | } | |
1973 | ||
1974 | /* | |
1975 | * Ask the consumer to create a channel and get it if successful. | |
1976 | * | |
1977 | * Return 0 on success or else a negative value. | |
1978 | */ | |
1979 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
1980 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
1981 | int bitness, struct ust_registry_session *registry) | |
1982 | { | |
1983 | int ret; | |
1984 | unsigned int nb_fd = 0; | |
1985 | struct consumer_socket *socket; | |
1986 | ||
1987 | assert(usess); | |
1988 | assert(ua_sess); | |
1989 | assert(ua_chan); | |
1990 | assert(registry); | |
1991 | ||
1992 | rcu_read_lock(); | |
1993 | health_code_update(); | |
1994 | ||
1995 | /* Get the right consumer socket for the application. */ | |
1996 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
1997 | if (!socket) { | |
1998 | ret = -EINVAL; | |
1999 | goto error; | |
2000 | } | |
2001 | ||
2002 | health_code_update(); | |
2003 | ||
2004 | /* Need one fd for the channel. */ | |
2005 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2006 | if (ret < 0) { | |
2007 | ERR("Exhausted number of available FD upon create channel"); | |
2008 | goto error; | |
2009 | } | |
2010 | ||
2011 | /* | |
2012 | * Ask consumer to create channel. The consumer will return the number of | |
2013 | * stream we have to expect. | |
2014 | */ | |
2015 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2016 | registry); | |
2017 | if (ret < 0) { | |
2018 | goto error_ask; | |
2019 | } | |
2020 | ||
2021 | /* | |
2022 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2023 | * stream (2 being the default value here). | |
2024 | */ | |
2025 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2026 | ||
2027 | /* Reserve the amount of file descriptor we need. */ | |
2028 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2029 | if (ret < 0) { | |
2030 | ERR("Exhausted number of available FD upon create channel"); | |
2031 | goto error_fd_get_stream; | |
2032 | } | |
2033 | ||
2034 | health_code_update(); | |
2035 | ||
2036 | /* | |
2037 | * Now get the channel from the consumer. This call wil populate the stream | |
2038 | * list of that channel and set the ust objects. | |
2039 | */ | |
d9078d0c DG |
2040 | if (usess->consumer->enabled) { |
2041 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2042 | if (ret < 0) { | |
2043 | goto error_destroy; | |
2044 | } | |
7972aab2 DG |
2045 | } |
2046 | ||
2047 | rcu_read_unlock(); | |
2048 | return 0; | |
2049 | ||
2050 | error_destroy: | |
2051 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2052 | error_fd_get_stream: | |
2053 | /* | |
2054 | * Initiate a destroy channel on the consumer since we had an error | |
2055 | * handling it on our side. The return value is of no importance since we | |
2056 | * already have a ret value set by the previous error that we need to | |
2057 | * return. | |
2058 | */ | |
2059 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2060 | error_ask: | |
2061 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2062 | error: | |
2063 | health_code_update(); | |
2064 | rcu_read_unlock(); | |
2065 | return ret; | |
2066 | } | |
2067 | ||
2068 | /* | |
2069 | * Duplicate the ust data object of the ust app stream and save it in the | |
2070 | * buffer registry stream. | |
2071 | * | |
2072 | * Return 0 on success or else a negative value. | |
2073 | */ | |
2074 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2075 | struct ust_app_stream *stream) | |
2076 | { | |
2077 | int ret; | |
2078 | ||
2079 | assert(reg_stream); | |
2080 | assert(stream); | |
2081 | ||
2082 | /* Reserve the amount of file descriptor we need. */ | |
2083 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2084 | if (ret < 0) { | |
2085 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2086 | goto error; | |
2087 | } | |
2088 | ||
2089 | /* Duplicate object for stream once the original is in the registry. */ | |
2090 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2091 | reg_stream->obj.ust); | |
2092 | if (ret < 0) { | |
2093 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2094 | reg_stream->obj.ust, stream->obj, ret); | |
2095 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2096 | goto error; | |
2097 | } | |
2098 | stream->handle = stream->obj->handle; | |
2099 | ||
2100 | error: | |
2101 | return ret; | |
2102 | } | |
2103 | ||
2104 | /* | |
2105 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2106 | * buffer registry channel. | |
2107 | * | |
2108 | * Return 0 on success or else a negative value. | |
2109 | */ | |
2110 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2111 | struct ust_app_channel *ua_chan) | |
2112 | { | |
2113 | int ret; | |
2114 | ||
2115 | assert(reg_chan); | |
2116 | assert(ua_chan); | |
2117 | ||
2118 | /* Need two fds for the channel. */ | |
2119 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2120 | if (ret < 0) { | |
2121 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2122 | goto error_fd_get; | |
2123 | } | |
2124 | ||
2125 | /* Duplicate object for stream once the original is in the registry. */ | |
2126 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2127 | if (ret < 0) { | |
2128 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2129 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2130 | goto error; | |
2131 | } | |
2132 | ua_chan->handle = ua_chan->obj->handle; | |
2133 | ||
2134 | return 0; | |
2135 | ||
2136 | error: | |
2137 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2138 | error_fd_get: | |
2139 | return ret; | |
2140 | } | |
2141 | ||
2142 | /* | |
2143 | * For a given channel buffer registry, setup all streams of the given ust | |
2144 | * application channel. | |
2145 | * | |
2146 | * Return 0 on success or else a negative value. | |
2147 | */ | |
2148 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2149 | struct ust_app_channel *ua_chan) | |
2150 | { | |
2151 | int ret = 0; | |
2152 | struct ust_app_stream *stream, *stmp; | |
2153 | ||
2154 | assert(reg_chan); | |
2155 | assert(ua_chan); | |
2156 | ||
2157 | DBG2("UST app setup buffer registry stream"); | |
2158 | ||
2159 | /* Send all streams to application. */ | |
2160 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2161 | struct buffer_reg_stream *reg_stream; | |
2162 | ||
2163 | ret = buffer_reg_stream_create(®_stream); | |
2164 | if (ret < 0) { | |
2165 | goto error; | |
2166 | } | |
2167 | ||
2168 | /* | |
2169 | * Keep original pointer and nullify it in the stream so the delete | |
2170 | * stream call does not release the object. | |
2171 | */ | |
2172 | reg_stream->obj.ust = stream->obj; | |
2173 | stream->obj = NULL; | |
2174 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2175 | |
7972aab2 DG |
2176 | /* We don't need the streams anymore. */ |
2177 | cds_list_del(&stream->list); | |
2178 | delete_ust_app_stream(-1, stream); | |
2179 | } | |
421cb601 | 2180 | |
7972aab2 DG |
2181 | error: |
2182 | return ret; | |
2183 | } | |
2184 | ||
2185 | /* | |
2186 | * Create a buffer registry channel for the given session registry and | |
2187 | * application channel object. If regp pointer is valid, it's set with the | |
2188 | * created object. Important, the created object is NOT added to the session | |
2189 | * registry hash table. | |
2190 | * | |
2191 | * Return 0 on success else a negative value. | |
2192 | */ | |
2193 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2194 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2195 | { | |
2196 | int ret; | |
2197 | struct buffer_reg_channel *reg_chan = NULL; | |
2198 | ||
2199 | assert(reg_sess); | |
2200 | assert(ua_chan); | |
2201 | ||
2202 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2203 | ||
2204 | /* Create buffer registry channel. */ | |
2205 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2206 | if (ret < 0) { | |
2207 | goto error_create; | |
421cb601 | 2208 | } |
7972aab2 DG |
2209 | assert(reg_chan); |
2210 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2211 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
421cb601 | 2212 | |
7972aab2 DG |
2213 | /* Create and add a channel registry to session. */ |
2214 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2215 | ua_chan->tracing_channel_id); | |
2216 | if (ret < 0) { | |
2217 | goto error; | |
d88aee68 | 2218 | } |
7972aab2 | 2219 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2220 | |
7972aab2 DG |
2221 | if (regp) { |
2222 | *regp = reg_chan; | |
3d8ca23b | 2223 | } |
d88aee68 | 2224 | |
7972aab2 | 2225 | return 0; |
3d8ca23b DG |
2226 | |
2227 | error: | |
7972aab2 DG |
2228 | /* Safe because the registry channel object was not added to any HT. */ |
2229 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2230 | error_create: | |
3d8ca23b | 2231 | return ret; |
421cb601 DG |
2232 | } |
2233 | ||
55cc08a6 | 2234 | /* |
7972aab2 DG |
2235 | * Setup buffer registry channel for the given session registry and application |
2236 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2237 | * |
7972aab2 | 2238 | * Return 0 on success else a negative value. |
55cc08a6 | 2239 | */ |
7972aab2 DG |
2240 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2241 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2242 | { |
7972aab2 | 2243 | int ret; |
55cc08a6 | 2244 | |
7972aab2 DG |
2245 | assert(reg_sess); |
2246 | assert(reg_chan); | |
2247 | assert(ua_chan); | |
2248 | assert(ua_chan->obj); | |
55cc08a6 | 2249 | |
7972aab2 | 2250 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2251 | |
7972aab2 DG |
2252 | /* Setup all streams for the registry. */ |
2253 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2254 | if (ret < 0) { | |
55cc08a6 DG |
2255 | goto error; |
2256 | } | |
2257 | ||
7972aab2 DG |
2258 | reg_chan->obj.ust = ua_chan->obj; |
2259 | ua_chan->obj = NULL; | |
55cc08a6 | 2260 | |
7972aab2 | 2261 | return 0; |
55cc08a6 DG |
2262 | |
2263 | error: | |
7972aab2 DG |
2264 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2265 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2266 | return ret; |
2267 | } | |
2268 | ||
edb67388 | 2269 | /* |
7972aab2 | 2270 | * Send buffer registry channel to the application. |
d0b96690 | 2271 | * |
7972aab2 | 2272 | * Return 0 on success else a negative value. |
edb67388 | 2273 | */ |
7972aab2 DG |
2274 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2275 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2276 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2277 | { |
2278 | int ret; | |
7972aab2 | 2279 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2280 | |
7972aab2 DG |
2281 | assert(reg_chan); |
2282 | assert(app); | |
2283 | assert(ua_sess); | |
2284 | assert(ua_chan); | |
2285 | ||
2286 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2287 | ||
2288 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2289 | if (ret < 0) { |
2290 | goto error; | |
2291 | } | |
2292 | ||
7972aab2 DG |
2293 | /* Send channel to the application. */ |
2294 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2295 | if (ret < 0) { | |
2296 | goto error; | |
2297 | } | |
2298 | ||
2299 | health_code_update(); | |
2300 | ||
2301 | /* Send all streams to application. */ | |
2302 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2303 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2304 | struct ust_app_stream stream; | |
2305 | ||
2306 | ret = duplicate_stream_object(reg_stream, &stream); | |
2307 | if (ret < 0) { | |
2308 | goto error_stream_unlock; | |
2309 | } | |
2310 | ||
2311 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2312 | if (ret < 0) { | |
8c067051 | 2313 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2314 | goto error_stream_unlock; |
2315 | } | |
edb67388 | 2316 | |
7972aab2 DG |
2317 | /* |
2318 | * The return value is not important here. This function will output an | |
2319 | * error if needed. | |
2320 | */ | |
2321 | (void) release_ust_app_stream(-1, &stream); | |
2322 | } | |
2323 | ua_chan->is_sent = 1; | |
2324 | ||
2325 | error_stream_unlock: | |
2326 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2327 | error: |
2328 | return ret; | |
2329 | } | |
2330 | ||
9730260e | 2331 | /* |
7972aab2 DG |
2332 | * Create and send to the application the created buffers with per UID buffers. |
2333 | * | |
2334 | * Return 0 on success else a negative value. | |
9730260e | 2335 | */ |
7972aab2 DG |
2336 | static int create_channel_per_uid(struct ust_app *app, |
2337 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2338 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2339 | { |
2340 | int ret; | |
7972aab2 DG |
2341 | struct buffer_reg_uid *reg_uid; |
2342 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2343 | |
7972aab2 DG |
2344 | assert(app); |
2345 | assert(usess); | |
2346 | assert(ua_sess); | |
2347 | assert(ua_chan); | |
2348 | ||
2349 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2350 | ||
2351 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2352 | /* | |
2353 | * The session creation handles the creation of this global registry | |
2354 | * object. If none can be find, there is a code flow problem or a | |
2355 | * teardown race. | |
2356 | */ | |
2357 | assert(reg_uid); | |
2358 | ||
2359 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2360 | reg_uid); | |
2361 | if (!reg_chan) { | |
2362 | /* Create the buffer registry channel object. */ | |
2363 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2364 | if (ret < 0) { | |
2365 | goto error; | |
2366 | } | |
2367 | assert(reg_chan); | |
2368 | ||
2369 | /* | |
2370 | * Create the buffers on the consumer side. This call populates the | |
2371 | * ust app channel object with all streams and data object. | |
2372 | */ | |
2373 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2374 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2375 | if (ret < 0) { | |
07d2ae95 DG |
2376 | /* |
2377 | * Let's remove the previously created buffer registry channel so | |
2378 | * it's not visible anymore in the session registry. | |
2379 | */ | |
2380 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2381 | ua_chan->tracing_channel_id); | |
2382 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2383 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2384 | goto error; |
2385 | } | |
2386 | ||
2387 | /* | |
2388 | * Setup the streams and add it to the session registry. | |
2389 | */ | |
2390 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2391 | if (ret < 0) { | |
2392 | goto error; | |
2393 | } | |
2394 | ||
2395 | } | |
2396 | ||
2397 | /* Send buffers to the application. */ | |
2398 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2399 | if (ret < 0) { |
2400 | goto error; | |
2401 | } | |
2402 | ||
9730260e DG |
2403 | error: |
2404 | return ret; | |
2405 | } | |
2406 | ||
78f0bacd | 2407 | /* |
7972aab2 DG |
2408 | * Create and send to the application the created buffers with per PID buffers. |
2409 | * | |
2410 | * Return 0 on success else a negative value. | |
78f0bacd | 2411 | */ |
7972aab2 DG |
2412 | static int create_channel_per_pid(struct ust_app *app, |
2413 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2414 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2415 | { |
8535a6d9 | 2416 | int ret; |
7972aab2 | 2417 | struct ust_registry_session *registry; |
78f0bacd | 2418 | |
7972aab2 DG |
2419 | assert(app); |
2420 | assert(usess); | |
2421 | assert(ua_sess); | |
2422 | assert(ua_chan); | |
2423 | ||
2424 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2425 | ||
2426 | rcu_read_lock(); | |
2427 | ||
2428 | registry = get_session_registry(ua_sess); | |
2429 | assert(registry); | |
2430 | ||
2431 | /* Create and add a new channel registry to session. */ | |
2432 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2433 | if (ret < 0) { |
2434 | goto error; | |
2435 | } | |
2436 | ||
7972aab2 DG |
2437 | /* Create and get channel on the consumer side. */ |
2438 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2439 | app->bits_per_long, registry); | |
2440 | if (ret < 0) { | |
2441 | goto error; | |
2442 | } | |
2443 | ||
2444 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2445 | if (ret < 0) { | |
2446 | goto error; | |
2447 | } | |
8535a6d9 | 2448 | |
78f0bacd | 2449 | error: |
7972aab2 | 2450 | rcu_read_unlock(); |
78f0bacd DG |
2451 | return ret; |
2452 | } | |
2453 | ||
2454 | /* | |
7972aab2 DG |
2455 | * From an already allocated ust app channel, create the channel buffers if |
2456 | * need and send it to the application. This MUST be called with a RCU read | |
2457 | * side lock acquired. | |
2458 | * | |
2459 | * Return 0 on success or else a negative value. | |
78f0bacd | 2460 | */ |
7972aab2 DG |
2461 | static int do_create_channel(struct ust_app *app, |
2462 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2463 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2464 | { |
7972aab2 | 2465 | int ret; |
78f0bacd | 2466 | |
7972aab2 DG |
2467 | assert(app); |
2468 | assert(usess); | |
2469 | assert(ua_sess); | |
2470 | assert(ua_chan); | |
2471 | ||
2472 | /* Handle buffer type before sending the channel to the application. */ | |
2473 | switch (usess->buffer_type) { | |
2474 | case LTTNG_BUFFER_PER_UID: | |
2475 | { | |
2476 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2477 | if (ret < 0) { | |
2478 | goto error; | |
2479 | } | |
2480 | break; | |
2481 | } | |
2482 | case LTTNG_BUFFER_PER_PID: | |
2483 | { | |
2484 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2485 | if (ret < 0) { | |
2486 | goto error; | |
2487 | } | |
2488 | break; | |
2489 | } | |
2490 | default: | |
2491 | assert(0); | |
2492 | ret = -EINVAL; | |
78f0bacd DG |
2493 | goto error; |
2494 | } | |
2495 | ||
7972aab2 DG |
2496 | /* Initialize ust objd object using the received handle and add it. */ |
2497 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2498 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2499 | |
7972aab2 DG |
2500 | /* If channel is not enabled, disable it on the tracer */ |
2501 | if (!ua_chan->enabled) { | |
2502 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2503 | if (ret < 0) { | |
2504 | goto error; | |
2505 | } | |
78f0bacd DG |
2506 | } |
2507 | ||
2508 | error: | |
2509 | return ret; | |
2510 | } | |
2511 | ||
284d8f55 | 2512 | /* |
4d710ac2 DG |
2513 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2514 | * newly created channel if not NULL. | |
d0b96690 | 2515 | * |
36b588ed | 2516 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2517 | * |
2518 | * Return 0 on success or else a negative value. | |
284d8f55 | 2519 | */ |
4d710ac2 DG |
2520 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2521 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2522 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2523 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2524 | { |
2525 | int ret = 0; | |
bec39940 DG |
2526 | struct lttng_ht_iter iter; |
2527 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2528 | struct ust_app_channel *ua_chan; |
2529 | ||
2530 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2531 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2532 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2533 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2534 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2535 | goto end; |
5b4a0ec0 DG |
2536 | } |
2537 | ||
d0b96690 | 2538 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2539 | if (ua_chan == NULL) { |
2540 | /* Only malloc can fail here */ | |
4d710ac2 | 2541 | ret = -ENOMEM; |
094d1690 | 2542 | goto error_alloc; |
fc34caaa DG |
2543 | } |
2544 | shadow_copy_channel(ua_chan, uchan); | |
2545 | ||
ffe60014 DG |
2546 | /* Set channel type. */ |
2547 | ua_chan->attr.type = type; | |
2548 | ||
7972aab2 | 2549 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2550 | if (ret < 0) { |
2551 | goto error; | |
2552 | } | |
2553 | ||
fc34caaa | 2554 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2555 | app->pid); |
fc34caaa | 2556 | |
d0b96690 DG |
2557 | /* Only add the channel if successful on the tracer side. */ |
2558 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2559 | ||
fc34caaa | 2560 | end: |
4d710ac2 DG |
2561 | if (ua_chanp) { |
2562 | *ua_chanp = ua_chan; | |
2563 | } | |
2564 | ||
2565 | /* Everything went well. */ | |
2566 | return 0; | |
5b4a0ec0 DG |
2567 | |
2568 | error: | |
d0b96690 | 2569 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2570 | error_alloc: |
4d710ac2 | 2571 | return ret; |
5b4a0ec0 DG |
2572 | } |
2573 | ||
2574 | /* | |
2575 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2576 | * |
2577 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2578 | */ |
edb67388 DG |
2579 | static |
2580 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2581 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2582 | struct ust_app *app) | |
284d8f55 | 2583 | { |
edb67388 | 2584 | int ret = 0; |
5b4a0ec0 | 2585 | struct ust_app_event *ua_event; |
284d8f55 | 2586 | |
5b4a0ec0 | 2587 | /* Get event node */ |
18eace3b DG |
2588 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
2589 | uevent->filter, uevent->attr.loglevel); | |
2590 | if (ua_event != NULL) { | |
fc34caaa | 2591 | ret = -EEXIST; |
edb67388 DG |
2592 | goto end; |
2593 | } | |
5b4a0ec0 | 2594 | |
edb67388 DG |
2595 | /* Does not exist so create one */ |
2596 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2597 | if (ua_event == NULL) { | |
2598 | /* Only malloc can failed so something is really wrong */ | |
2599 | ret = -ENOMEM; | |
fc34caaa | 2600 | goto end; |
5b4a0ec0 | 2601 | } |
edb67388 | 2602 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2603 | |
edb67388 | 2604 | /* Create it on the tracer side */ |
5b4a0ec0 | 2605 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2606 | if (ret < 0) { |
fc34caaa | 2607 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2608 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2609 | goto error; |
2610 | } | |
2611 | ||
d0b96690 | 2612 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2613 | |
fc34caaa | 2614 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2615 | app->pid); |
7f79d3a1 | 2616 | |
edb67388 | 2617 | end: |
fc34caaa DG |
2618 | return ret; |
2619 | ||
5b4a0ec0 | 2620 | error: |
fc34caaa DG |
2621 | /* Valid. Calling here is already in a read side lock */ |
2622 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2623 | return ret; |
5b4a0ec0 DG |
2624 | } |
2625 | ||
2626 | /* | |
2627 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2628 | * |
7972aab2 | 2629 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2630 | */ |
2631 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
d65d2de8 DG |
2632 | struct ust_app *app, struct consumer_output *consumer, |
2633 | struct ustctl_consumer_channel_attr *attr) | |
5b4a0ec0 DG |
2634 | { |
2635 | int ret = 0; | |
ffe60014 | 2636 | struct ust_app_channel *metadata; |
d88aee68 | 2637 | struct consumer_socket *socket; |
7972aab2 | 2638 | struct ust_registry_session *registry; |
5b4a0ec0 | 2639 | |
ffe60014 DG |
2640 | assert(ua_sess); |
2641 | assert(app); | |
d88aee68 | 2642 | assert(consumer); |
5b4a0ec0 | 2643 | |
7972aab2 DG |
2644 | registry = get_session_registry(ua_sess); |
2645 | assert(registry); | |
2646 | ||
1b532a60 DG |
2647 | /* Metadata already exists for this registry or it was closed previously */ |
2648 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2649 | ret = 0; |
2650 | goto error; | |
5b4a0ec0 DG |
2651 | } |
2652 | ||
ffe60014 | 2653 | /* Allocate UST metadata */ |
d0b96690 | 2654 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2655 | if (!metadata) { |
2656 | /* malloc() failed */ | |
2657 | ret = -ENOMEM; | |
2658 | goto error; | |
2659 | } | |
5b4a0ec0 | 2660 | |
d65d2de8 DG |
2661 | if (!attr) { |
2662 | /* Set default attributes for metadata. */ | |
2663 | metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
2664 | metadata->attr.subbuf_size = default_get_metadata_subbuf_size(); | |
2665 | metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
0a9c6494 DG |
2666 | metadata->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER; |
2667 | metadata->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER; | |
d65d2de8 DG |
2668 | metadata->attr.output = LTTNG_UST_MMAP; |
2669 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2670 | } else { | |
2671 | memcpy(&metadata->attr, attr, sizeof(metadata->attr)); | |
2672 | metadata->attr.output = LTTNG_UST_MMAP; | |
2673 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2674 | } | |
5b4a0ec0 | 2675 | |
7972aab2 DG |
2676 | /* Need one fd for the channel. */ |
2677 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2678 | if (ret < 0) { | |
2679 | ERR("Exhausted number of available FD upon create metadata"); | |
2680 | goto error; | |
2681 | } | |
2682 | ||
4dc3dfc5 DG |
2683 | /* Get the right consumer socket for the application. */ |
2684 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2685 | if (!socket) { | |
2686 | ret = -EINVAL; | |
2687 | goto error_consumer; | |
2688 | } | |
2689 | ||
331744e3 JD |
2690 | /* |
2691 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2692 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2693 | * consumer requesting the metadata and the ask_channel call on our side | |
2694 | * did not returned yet. | |
2695 | */ | |
2696 | registry->metadata_key = metadata->key; | |
2697 | ||
d88aee68 DG |
2698 | /* |
2699 | * Ask the metadata channel creation to the consumer. The metadata object | |
2700 | * will be created by the consumer and kept their. However, the stream is | |
2701 | * never added or monitored until we do a first push metadata to the | |
2702 | * consumer. | |
2703 | */ | |
7972aab2 DG |
2704 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2705 | registry); | |
d88aee68 | 2706 | if (ret < 0) { |
f2a444f1 DG |
2707 | /* Nullify the metadata key so we don't try to close it later on. */ |
2708 | registry->metadata_key = 0; | |
d88aee68 DG |
2709 | goto error_consumer; |
2710 | } | |
2711 | ||
2712 | /* | |
2713 | * The setup command will make the metadata stream be sent to the relayd, | |
2714 | * if applicable, and the thread managing the metadatas. This is important | |
2715 | * because after this point, if an error occurs, the only way the stream | |
2716 | * can be deleted is to be monitored in the consumer. | |
2717 | */ | |
7972aab2 | 2718 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2719 | if (ret < 0) { |
f2a444f1 DG |
2720 | /* Nullify the metadata key so we don't try to close it later on. */ |
2721 | registry->metadata_key = 0; | |
d88aee68 | 2722 | goto error_consumer; |
5b4a0ec0 DG |
2723 | } |
2724 | ||
7972aab2 DG |
2725 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2726 | metadata->key, app->pid); | |
5b4a0ec0 | 2727 | |
d88aee68 | 2728 | error_consumer: |
b80f0b6c | 2729 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2730 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2731 | error: |
ffe60014 | 2732 | return ret; |
5b4a0ec0 DG |
2733 | } |
2734 | ||
2735 | /* | |
2736 | * Return pointer to traceable apps list. | |
2737 | */ | |
bec39940 | 2738 | struct lttng_ht *ust_app_get_ht(void) |
5b4a0ec0 DG |
2739 | { |
2740 | return ust_app_ht; | |
2741 | } | |
2742 | ||
2743 | /* | |
d88aee68 DG |
2744 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2745 | * acquired before calling this function. | |
5b4a0ec0 DG |
2746 | */ |
2747 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2748 | { | |
d88aee68 | 2749 | struct ust_app *app = NULL; |
bec39940 DG |
2750 | struct lttng_ht_node_ulong *node; |
2751 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2752 | |
bec39940 DG |
2753 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2754 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2755 | if (node == NULL) { |
2756 | DBG2("UST app no found with pid %d", pid); | |
2757 | goto error; | |
2758 | } | |
5b4a0ec0 DG |
2759 | |
2760 | DBG2("Found UST app by pid %d", pid); | |
2761 | ||
d88aee68 | 2762 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2763 | |
2764 | error: | |
d88aee68 | 2765 | return app; |
5b4a0ec0 DG |
2766 | } |
2767 | ||
d88aee68 DG |
2768 | /* |
2769 | * Allocate and init an UST app object using the registration information and | |
2770 | * the command socket. This is called when the command socket connects to the | |
2771 | * session daemon. | |
2772 | * | |
2773 | * The object is returned on success or else NULL. | |
2774 | */ | |
d0b96690 | 2775 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2776 | { |
d0b96690 DG |
2777 | struct ust_app *lta = NULL; |
2778 | ||
2779 | assert(msg); | |
2780 | assert(sock >= 0); | |
2781 | ||
2782 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2783 | |
173af62f DG |
2784 | if ((msg->bits_per_long == 64 && |
2785 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2786 | || (msg->bits_per_long == 32 && | |
2787 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2788 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2789 | "%d-bit long, but no consumerd for this size is available.\n", |
2790 | msg->name, msg->pid, msg->bits_per_long); | |
2791 | goto error; | |
3f2c5fcc | 2792 | } |
d0b96690 | 2793 | |
5b4a0ec0 DG |
2794 | lta = zmalloc(sizeof(struct ust_app)); |
2795 | if (lta == NULL) { | |
2796 | PERROR("malloc"); | |
d0b96690 | 2797 | goto error; |
5b4a0ec0 DG |
2798 | } |
2799 | ||
2800 | lta->ppid = msg->ppid; | |
2801 | lta->uid = msg->uid; | |
2802 | lta->gid = msg->gid; | |
d0b96690 | 2803 | |
7753dea8 | 2804 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2805 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2806 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2807 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2808 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2809 | lta->long_alignment = msg->long_alignment; | |
2810 | lta->byte_order = msg->byte_order; | |
2811 | ||
5b4a0ec0 DG |
2812 | lta->v_major = msg->major; |
2813 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 2814 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
2815 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2816 | lta->notify_sock = -1; | |
d88aee68 DG |
2817 | |
2818 | /* Copy name and make sure it's NULL terminated. */ | |
2819 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2820 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2821 | ||
2822 | /* | |
2823 | * Before this can be called, when receiving the registration information, | |
2824 | * the application compatibility is checked. So, at this point, the | |
2825 | * application can work with this session daemon. | |
2826 | */ | |
d0b96690 | 2827 | lta->compatible = 1; |
5b4a0ec0 | 2828 | |
852d0037 | 2829 | lta->pid = msg->pid; |
d0b96690 | 2830 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2831 | lta->sock = sock; |
d0b96690 | 2832 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2833 | |
d42f20df DG |
2834 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2835 | ||
d0b96690 DG |
2836 | error: |
2837 | return lta; | |
2838 | } | |
2839 | ||
d88aee68 DG |
2840 | /* |
2841 | * For a given application object, add it to every hash table. | |
2842 | */ | |
d0b96690 DG |
2843 | void ust_app_add(struct ust_app *app) |
2844 | { | |
2845 | assert(app); | |
2846 | assert(app->notify_sock >= 0); | |
2847 | ||
5b4a0ec0 | 2848 | rcu_read_lock(); |
852d0037 DG |
2849 | |
2850 | /* | |
2851 | * On a re-registration, we want to kick out the previous registration of | |
2852 | * that pid | |
2853 | */ | |
d0b96690 | 2854 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
2855 | |
2856 | /* | |
2857 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
2858 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
2859 | * already in the table. | |
2860 | */ | |
d0b96690 | 2861 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 2862 | |
d0b96690 DG |
2863 | /* Add application to the notify socket hash table. */ |
2864 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
2865 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 2866 | |
d0b96690 | 2867 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
2868 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
2869 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
2870 | app->v_minor); | |
5b4a0ec0 | 2871 | |
d0b96690 DG |
2872 | rcu_read_unlock(); |
2873 | } | |
2874 | ||
d88aee68 DG |
2875 | /* |
2876 | * Set the application version into the object. | |
2877 | * | |
2878 | * Return 0 on success else a negative value either an errno code or a | |
2879 | * LTTng-UST error code. | |
2880 | */ | |
d0b96690 DG |
2881 | int ust_app_version(struct ust_app *app) |
2882 | { | |
d88aee68 DG |
2883 | int ret; |
2884 | ||
d0b96690 | 2885 | assert(app); |
d88aee68 DG |
2886 | |
2887 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2888 | if (ret < 0) { | |
2889 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2890 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2891 | } else { | |
2892 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2893 | } | |
2894 | } | |
2895 | ||
2896 | return ret; | |
5b4a0ec0 DG |
2897 | } |
2898 | ||
2899 | /* | |
2900 | * Unregister app by removing it from the global traceable app list and freeing | |
2901 | * the data struct. | |
2902 | * | |
2903 | * The socket is already closed at this point so no close to sock. | |
2904 | */ | |
2905 | void ust_app_unregister(int sock) | |
2906 | { | |
2907 | struct ust_app *lta; | |
bec39940 DG |
2908 | struct lttng_ht_node_ulong *node; |
2909 | struct lttng_ht_iter iter; | |
d42f20df | 2910 | struct ust_app_session *ua_sess; |
525b0740 | 2911 | int ret; |
5b4a0ec0 DG |
2912 | |
2913 | rcu_read_lock(); | |
886459c6 | 2914 | |
5b4a0ec0 | 2915 | /* Get the node reference for a call_rcu */ |
852d0037 | 2916 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 2917 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 2918 | assert(node); |
284d8f55 | 2919 | |
852d0037 | 2920 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
2921 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
2922 | ||
886459c6 | 2923 | /* Remove application from PID hash table */ |
852d0037 DG |
2924 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
2925 | assert(!ret); | |
2926 | ||
d88aee68 DG |
2927 | /* |
2928 | * Remove application from notify hash table. The thread handling the | |
2929 | * notify socket could have deleted the node so ignore on error because | |
2930 | * either way it's valid. The close of that socket is handled by the other | |
2931 | * thread. | |
2932 | */ | |
d0b96690 | 2933 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 2934 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 2935 | |
5b98a774 DG |
2936 | /* |
2937 | * Ignore return value since the node might have been removed before by an | |
2938 | * add replace during app registration because the PID can be reassigned by | |
2939 | * the OS. | |
2940 | */ | |
d0b96690 | 2941 | iter.iter.node = <a->pid_n.node; |
bec39940 | 2942 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
2943 | if (ret) { |
2944 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
2945 | lta->pid); | |
2946 | } | |
852d0037 | 2947 | |
d42f20df DG |
2948 | /* Remove sessions so they are not visible during deletion.*/ |
2949 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
2950 | node.node) { | |
7972aab2 DG |
2951 | struct ust_registry_session *registry; |
2952 | ||
d42f20df DG |
2953 | ret = lttng_ht_del(lta->sessions, &iter); |
2954 | if (ret) { | |
2955 | /* The session was already removed so scheduled for teardown. */ | |
2956 | continue; | |
2957 | } | |
2958 | ||
2959 | /* | |
2960 | * Add session to list for teardown. This is safe since at this point we | |
2961 | * are the only one using this list. | |
2962 | */ | |
d88aee68 DG |
2963 | pthread_mutex_lock(&ua_sess->lock); |
2964 | ||
2965 | /* | |
2966 | * Normally, this is done in the delete session process which is | |
2967 | * executed in the call rcu below. However, upon registration we can't | |
2968 | * afford to wait for the grace period before pushing data or else the | |
2969 | * data pending feature can race between the unregistration and stop | |
2970 | * command where the data pending command is sent *before* the grace | |
2971 | * period ended. | |
2972 | * | |
2973 | * The close metadata below nullifies the metadata pointer in the | |
2974 | * session so the delete session will NOT push/close a second time. | |
2975 | */ | |
7972aab2 | 2976 | registry = get_session_registry(ua_sess); |
1b532a60 | 2977 | if (registry && !registry->metadata_closed) { |
7972aab2 DG |
2978 | /* Push metadata for application before freeing the application. */ |
2979 | (void) push_metadata(registry, ua_sess->consumer); | |
2980 | ||
2981 | /* | |
2982 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
2983 | * metadata only on destroy trace session in this case. Also, the |
2984 | * previous push metadata could have flag the metadata registry to | |
2985 | * close so don't send a close command if closed. | |
7972aab2 | 2986 | */ |
1b532a60 DG |
2987 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
2988 | !registry->metadata_closed) { | |
7972aab2 DG |
2989 | /* And ask to close it for this session registry. */ |
2990 | (void) close_metadata(registry, ua_sess->consumer); | |
2991 | } | |
2992 | } | |
d88aee68 | 2993 | |
d42f20df | 2994 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 2995 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
2996 | } |
2997 | ||
852d0037 DG |
2998 | /* Free memory */ |
2999 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3000 | ||
5b4a0ec0 DG |
3001 | rcu_read_unlock(); |
3002 | return; | |
284d8f55 DG |
3003 | } |
3004 | ||
3005 | /* | |
5b4a0ec0 | 3006 | * Return traceable_app_count |
284d8f55 | 3007 | */ |
5b4a0ec0 | 3008 | unsigned long ust_app_list_count(void) |
284d8f55 | 3009 | { |
5b4a0ec0 | 3010 | unsigned long count; |
284d8f55 | 3011 | |
5b4a0ec0 | 3012 | rcu_read_lock(); |
bec39940 | 3013 | count = lttng_ht_get_count(ust_app_ht); |
5b4a0ec0 | 3014 | rcu_read_unlock(); |
284d8f55 | 3015 | |
5b4a0ec0 | 3016 | return count; |
284d8f55 DG |
3017 | } |
3018 | ||
5b4a0ec0 DG |
3019 | /* |
3020 | * Fill events array with all events name of all registered apps. | |
3021 | */ | |
3022 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3023 | { |
5b4a0ec0 DG |
3024 | int ret, handle; |
3025 | size_t nbmem, count = 0; | |
bec39940 | 3026 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3027 | struct ust_app *app; |
c617c0c6 | 3028 | struct lttng_event *tmp_event; |
421cb601 | 3029 | |
5b4a0ec0 | 3030 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3031 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3032 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3033 | PERROR("zmalloc ust app events"); |
3034 | ret = -ENOMEM; | |
421cb601 DG |
3035 | goto error; |
3036 | } | |
3037 | ||
5b4a0ec0 | 3038 | rcu_read_lock(); |
421cb601 | 3039 | |
852d0037 | 3040 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3041 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3042 | |
840cb59c | 3043 | health_code_update(); |
86acf0da | 3044 | |
e0c7ec2b DG |
3045 | if (!app->compatible) { |
3046 | /* | |
3047 | * TODO: In time, we should notice the caller of this error by | |
3048 | * telling him that this is a version error. | |
3049 | */ | |
3050 | continue; | |
3051 | } | |
852d0037 | 3052 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3053 | if (handle < 0) { |
ffe60014 DG |
3054 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3055 | ERR("UST app list events getting handle failed for app pid %d", | |
3056 | app->pid); | |
3057 | } | |
5b4a0ec0 DG |
3058 | continue; |
3059 | } | |
421cb601 | 3060 | |
852d0037 | 3061 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3062 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3063 | /* Handle ustctl error. */ |
3064 | if (ret < 0) { | |
3065 | free(tmp_event); | |
3066 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3067 | ERR("UST app tp list get failed for app %d with ret %d", | |
3068 | app->sock, ret); | |
3069 | } else { | |
3070 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3071 | /* |
3072 | * This is normal behavior, an application can die during the | |
3073 | * creation process. Don't report an error so the execution can | |
3074 | * continue normally. Continue normal execution. | |
3075 | */ | |
3076 | break; | |
ffe60014 DG |
3077 | } |
3078 | goto rcu_error; | |
3079 | } | |
3080 | ||
840cb59c | 3081 | health_code_update(); |
815564d8 | 3082 | if (count >= nbmem) { |
d7b3776f | 3083 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3084 | void *ptr; |
3085 | ||
815564d8 MD |
3086 | DBG2("Reallocating event list from %zu to %zu entries", nbmem, |
3087 | 2 * nbmem); | |
3088 | nbmem *= 2; | |
c617c0c6 MD |
3089 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event)); |
3090 | if (ptr == NULL) { | |
5b4a0ec0 | 3091 | PERROR("realloc ust app events"); |
c617c0c6 | 3092 | free(tmp_event); |
5b4a0ec0 DG |
3093 | ret = -ENOMEM; |
3094 | goto rcu_error; | |
3095 | } | |
c617c0c6 | 3096 | tmp_event = ptr; |
5b4a0ec0 | 3097 | } |
c617c0c6 MD |
3098 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3099 | tmp_event[count].loglevel = uiter.loglevel; | |
3100 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3101 | tmp_event[count].pid = app->pid; | |
3102 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3103 | count++; |
421cb601 | 3104 | } |
421cb601 DG |
3105 | } |
3106 | ||
5b4a0ec0 | 3107 | ret = count; |
c617c0c6 | 3108 | *events = tmp_event; |
421cb601 | 3109 | |
5b4a0ec0 | 3110 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3111 | |
5b4a0ec0 DG |
3112 | rcu_error: |
3113 | rcu_read_unlock(); | |
421cb601 | 3114 | error: |
840cb59c | 3115 | health_code_update(); |
5b4a0ec0 | 3116 | return ret; |
421cb601 DG |
3117 | } |
3118 | ||
f37d259d MD |
3119 | /* |
3120 | * Fill events array with all events name of all registered apps. | |
3121 | */ | |
3122 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3123 | { | |
3124 | int ret, handle; | |
3125 | size_t nbmem, count = 0; | |
3126 | struct lttng_ht_iter iter; | |
3127 | struct ust_app *app; | |
c617c0c6 | 3128 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3129 | |
3130 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3131 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3132 | if (tmp_event == NULL) { | |
f37d259d MD |
3133 | PERROR("zmalloc ust app event fields"); |
3134 | ret = -ENOMEM; | |
3135 | goto error; | |
3136 | } | |
3137 | ||
3138 | rcu_read_lock(); | |
3139 | ||
3140 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3141 | struct lttng_ust_field_iter uiter; | |
3142 | ||
840cb59c | 3143 | health_code_update(); |
86acf0da | 3144 | |
f37d259d MD |
3145 | if (!app->compatible) { |
3146 | /* | |
3147 | * TODO: In time, we should notice the caller of this error by | |
3148 | * telling him that this is a version error. | |
3149 | */ | |
3150 | continue; | |
3151 | } | |
3152 | handle = ustctl_tracepoint_field_list(app->sock); | |
3153 | if (handle < 0) { | |
ffe60014 DG |
3154 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3155 | ERR("UST app list field getting handle failed for app pid %d", | |
3156 | app->pid); | |
3157 | } | |
f37d259d MD |
3158 | continue; |
3159 | } | |
3160 | ||
3161 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3162 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3163 | /* Handle ustctl error. */ |
3164 | if (ret < 0) { | |
3165 | free(tmp_event); | |
3166 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3167 | ERR("UST app tp list field failed for app %d with ret %d", | |
3168 | app->sock, ret); | |
3169 | } else { | |
3170 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3171 | /* |
3172 | * This is normal behavior, an application can die during the | |
3173 | * creation process. Don't report an error so the execution can | |
3174 | * continue normally. | |
3175 | */ | |
3176 | break; | |
ffe60014 DG |
3177 | } |
3178 | goto rcu_error; | |
3179 | } | |
3180 | ||
840cb59c | 3181 | health_code_update(); |
f37d259d | 3182 | if (count >= nbmem) { |
d7b3776f | 3183 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3184 | void *ptr; |
3185 | ||
f37d259d MD |
3186 | DBG2("Reallocating event field list from %zu to %zu entries", nbmem, |
3187 | 2 * nbmem); | |
3188 | nbmem *= 2; | |
c617c0c6 MD |
3189 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field)); |
3190 | if (ptr == NULL) { | |
f37d259d | 3191 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3192 | free(tmp_event); |
f37d259d MD |
3193 | ret = -ENOMEM; |
3194 | goto rcu_error; | |
3195 | } | |
c617c0c6 | 3196 | tmp_event = ptr; |
f37d259d | 3197 | } |
f37d259d | 3198 | |
c617c0c6 | 3199 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
72b6f5b6 DG |
3200 | /* Mapping between these enums matches 1 to 1. */ |
3201 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3202 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3203 | |
c617c0c6 MD |
3204 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3205 | tmp_event[count].event.loglevel = uiter.loglevel; | |
72b6f5b6 | 3206 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3207 | tmp_event[count].event.pid = app->pid; |
3208 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3209 | count++; |
3210 | } | |
3211 | } | |
3212 | ||
3213 | ret = count; | |
c617c0c6 | 3214 | *fields = tmp_event; |
f37d259d MD |
3215 | |
3216 | DBG2("UST app list event fields done (%zu events)", count); | |
3217 | ||
3218 | rcu_error: | |
3219 | rcu_read_unlock(); | |
3220 | error: | |
840cb59c | 3221 | health_code_update(); |
f37d259d MD |
3222 | return ret; |
3223 | } | |
3224 | ||
5b4a0ec0 DG |
3225 | /* |
3226 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3227 | * |
3228 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3229 | */ |
3230 | void ust_app_clean_list(void) | |
421cb601 | 3231 | { |
5b4a0ec0 | 3232 | int ret; |
659ed79f | 3233 | struct ust_app *app; |
bec39940 | 3234 | struct lttng_ht_iter iter; |
421cb601 | 3235 | |
5b4a0ec0 | 3236 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3237 | |
5b4a0ec0 | 3238 | rcu_read_lock(); |
421cb601 | 3239 | |
659ed79f | 3240 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3241 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3242 | assert(!ret); |
659ed79f | 3243 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3244 | } |
3245 | ||
852d0037 | 3246 | /* Cleanup socket hash table */ |
659ed79f DG |
3247 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3248 | sock_n.node) { | |
852d0037 | 3249 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3250 | assert(!ret); |
3251 | } | |
852d0037 | 3252 | |
d88aee68 DG |
3253 | /* Cleanup notify socket hash table */ |
3254 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3255 | notify_sock_n.node) { | |
3256 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3257 | assert(!ret); | |
3258 | } | |
36b588ed | 3259 | rcu_read_unlock(); |
d88aee68 | 3260 | |
bec39940 | 3261 | /* Destroy is done only when the ht is empty */ |
0b2dc8df MD |
3262 | ht_cleanup_push(ust_app_ht); |
3263 | ht_cleanup_push(ust_app_ht_by_sock); | |
3264 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
5b4a0ec0 DG |
3265 | } |
3266 | ||
3267 | /* | |
3268 | * Init UST app hash table. | |
3269 | */ | |
3270 | void ust_app_ht_alloc(void) | |
3271 | { | |
bec39940 | 3272 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3273 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3274 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3275 | } |
3276 | ||
78f0bacd DG |
3277 | /* |
3278 | * For a specific UST session, disable the channel for all registered apps. | |
3279 | */ | |
35a9059d | 3280 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3281 | struct ltt_ust_channel *uchan) |
3282 | { | |
3283 | int ret = 0; | |
bec39940 DG |
3284 | struct lttng_ht_iter iter; |
3285 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3286 | struct ust_app *app; |
3287 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3288 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3289 | |
3290 | if (usess == NULL || uchan == NULL) { | |
3291 | ERR("Disabling UST global channel with NULL values"); | |
3292 | ret = -1; | |
3293 | goto error; | |
3294 | } | |
3295 | ||
d9bf3ca4 | 3296 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3297 | uchan->name, usess->id); |
78f0bacd DG |
3298 | |
3299 | rcu_read_lock(); | |
3300 | ||
3301 | /* For every registered applications */ | |
852d0037 | 3302 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3303 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3304 | if (!app->compatible) { |
3305 | /* | |
3306 | * TODO: In time, we should notice the caller of this error by | |
3307 | * telling him that this is a version error. | |
3308 | */ | |
3309 | continue; | |
3310 | } | |
78f0bacd DG |
3311 | ua_sess = lookup_session_by_app(usess, app); |
3312 | if (ua_sess == NULL) { | |
3313 | continue; | |
3314 | } | |
3315 | ||
8535a6d9 | 3316 | /* Get channel */ |
bec39940 DG |
3317 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3318 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3319 | /* If the session if found for the app, the channel must be there */ |
3320 | assert(ua_chan_node); | |
3321 | ||
3322 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3323 | /* The channel must not be already disabled */ | |
3324 | assert(ua_chan->enabled == 1); | |
3325 | ||
3326 | /* Disable channel onto application */ | |
3327 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3328 | if (ret < 0) { |
3329 | /* XXX: We might want to report this error at some point... */ | |
3330 | continue; | |
3331 | } | |
3332 | } | |
3333 | ||
3334 | rcu_read_unlock(); | |
3335 | ||
3336 | error: | |
3337 | return ret; | |
3338 | } | |
3339 | ||
3340 | /* | |
3341 | * For a specific UST session, enable the channel for all registered apps. | |
3342 | */ | |
35a9059d | 3343 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3344 | struct ltt_ust_channel *uchan) |
3345 | { | |
3346 | int ret = 0; | |
bec39940 | 3347 | struct lttng_ht_iter iter; |
78f0bacd DG |
3348 | struct ust_app *app; |
3349 | struct ust_app_session *ua_sess; | |
3350 | ||
3351 | if (usess == NULL || uchan == NULL) { | |
3352 | ERR("Adding UST global channel to NULL values"); | |
3353 | ret = -1; | |
3354 | goto error; | |
3355 | } | |
3356 | ||
d9bf3ca4 | 3357 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3358 | uchan->name, usess->id); |
78f0bacd DG |
3359 | |
3360 | rcu_read_lock(); | |
3361 | ||
3362 | /* For every registered applications */ | |
852d0037 | 3363 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3364 | if (!app->compatible) { |
3365 | /* | |
3366 | * TODO: In time, we should notice the caller of this error by | |
3367 | * telling him that this is a version error. | |
3368 | */ | |
3369 | continue; | |
3370 | } | |
78f0bacd DG |
3371 | ua_sess = lookup_session_by_app(usess, app); |
3372 | if (ua_sess == NULL) { | |
3373 | continue; | |
3374 | } | |
3375 | ||
3376 | /* Enable channel onto application */ | |
3377 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3378 | if (ret < 0) { | |
3379 | /* XXX: We might want to report this error at some point... */ | |
3380 | continue; | |
3381 | } | |
3382 | } | |
3383 | ||
3384 | rcu_read_unlock(); | |
3385 | ||
3386 | error: | |
3387 | return ret; | |
3388 | } | |
3389 | ||
b0a40d28 DG |
3390 | /* |
3391 | * Disable an event in a channel and for a specific session. | |
3392 | */ | |
35a9059d DG |
3393 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3394 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3395 | { |
3396 | int ret = 0; | |
bec39940 DG |
3397 | struct lttng_ht_iter iter, uiter; |
3398 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3399 | struct ust_app *app; |
3400 | struct ust_app_session *ua_sess; | |
3401 | struct ust_app_channel *ua_chan; | |
3402 | struct ust_app_event *ua_event; | |
3403 | ||
3404 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3405 | "%s for session id %" PRIu64, |
3406 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3407 | |
3408 | rcu_read_lock(); | |
3409 | ||
3410 | /* For all registered applications */ | |
852d0037 | 3411 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3412 | if (!app->compatible) { |
3413 | /* | |
3414 | * TODO: In time, we should notice the caller of this error by | |
3415 | * telling him that this is a version error. | |
3416 | */ | |
3417 | continue; | |
3418 | } | |
b0a40d28 DG |
3419 | ua_sess = lookup_session_by_app(usess, app); |
3420 | if (ua_sess == NULL) { | |
3421 | /* Next app */ | |
3422 | continue; | |
3423 | } | |
3424 | ||
3425 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3426 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3427 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3428 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3429 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3430 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3431 | continue; |
3432 | } | |
3433 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3434 | ||
bec39940 DG |
3435 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3436 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3437 | if (ua_event_node == NULL) { |
3438 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3439 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3440 | continue; |
3441 | } | |
3442 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3443 | ||
7f79d3a1 | 3444 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3445 | if (ret < 0) { |
3446 | /* XXX: Report error someday... */ | |
3447 | continue; | |
3448 | } | |
3449 | } | |
3450 | ||
3451 | rcu_read_unlock(); | |
3452 | ||
3453 | return ret; | |
3454 | } | |
3455 | ||
9730260e | 3456 | /* |
edb67388 | 3457 | * For a specific UST session and UST channel, the event for all |
9730260e DG |
3458 | * registered apps. |
3459 | */ | |
35a9059d | 3460 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
9730260e DG |
3461 | struct ltt_ust_channel *uchan) |
3462 | { | |
3463 | int ret = 0; | |
bec39940 DG |
3464 | struct lttng_ht_iter iter, uiter; |
3465 | struct lttng_ht_node_str *ua_chan_node; | |
9730260e DG |
3466 | struct ust_app *app; |
3467 | struct ust_app_session *ua_sess; | |
3468 | struct ust_app_channel *ua_chan; | |
3469 | struct ust_app_event *ua_event; | |
3470 | ||
3471 | DBG("UST app disabling all event for all apps in channel " | |
d9bf3ca4 | 3472 | "%s for session id %" PRIu64, uchan->name, usess->id); |
9730260e DG |
3473 | |
3474 | rcu_read_lock(); | |
3475 | ||
3476 | /* For all registered applications */ | |
852d0037 | 3477 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3478 | if (!app->compatible) { |
3479 | /* | |
3480 | * TODO: In time, we should notice the caller of this error by | |
3481 | * telling him that this is a version error. | |
3482 | */ | |
3483 | continue; | |
3484 | } | |
9730260e | 3485 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3486 | if (!ua_sess) { |
3487 | /* The application has problem or is probably dead. */ | |
3488 | continue; | |
3489 | } | |
9730260e DG |
3490 | |
3491 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3492 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3493 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3494 | /* If the channel is not found, there is a code flow error */ |
3495 | assert(ua_chan_node); | |
3496 | ||
9730260e DG |
3497 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3498 | ||
3499 | /* Disable each events of channel */ | |
bec39940 DG |
3500 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3501 | node.node) { | |
7f79d3a1 | 3502 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
9730260e DG |
3503 | if (ret < 0) { |
3504 | /* XXX: Report error someday... */ | |
3505 | continue; | |
3506 | } | |
3507 | } | |
3508 | } | |
3509 | ||
3510 | rcu_read_unlock(); | |
3511 | ||
3512 | return ret; | |
3513 | } | |
3514 | ||
421cb601 | 3515 | /* |
5b4a0ec0 | 3516 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3517 | */ |
35a9059d | 3518 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3519 | struct ltt_ust_channel *uchan) |
3520 | { | |
3d8ca23b | 3521 | int ret = 0, created; |
bec39940 | 3522 | struct lttng_ht_iter iter; |
48842b30 | 3523 | struct ust_app *app; |
3d8ca23b | 3524 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3525 | |
fc34caaa DG |
3526 | /* Very wrong code flow */ |
3527 | assert(usess); | |
3528 | assert(uchan); | |
421cb601 | 3529 | |
d9bf3ca4 | 3530 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3531 | uchan->name, usess->id); |
48842b30 DG |
3532 | |
3533 | rcu_read_lock(); | |
421cb601 | 3534 | |
5b4a0ec0 | 3535 | /* For every registered applications */ |
852d0037 | 3536 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3537 | if (!app->compatible) { |
3538 | /* | |
3539 | * TODO: In time, we should notice the caller of this error by | |
3540 | * telling him that this is a version error. | |
3541 | */ | |
3542 | continue; | |
3543 | } | |
edb67388 DG |
3544 | /* |
3545 | * Create session on the tracer side and add it to app session HT. Note | |
3546 | * that if session exist, it will simply return a pointer to the ust | |
3547 | * app session. | |
3548 | */ | |
3d8ca23b DG |
3549 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3550 | if (ret < 0) { | |
3551 | switch (ret) { | |
3552 | case -ENOTCONN: | |
3553 | /* | |
3554 | * The application's socket is not valid. Either a bad socket | |
3555 | * or a timeout on it. We can't inform the caller that for a | |
3556 | * specific app, the session failed so lets continue here. | |
3557 | */ | |
3558 | continue; | |
3559 | case -ENOMEM: | |
3560 | default: | |
3561 | goto error_rcu_unlock; | |
3562 | } | |
48842b30 | 3563 | } |
3d8ca23b | 3564 | assert(ua_sess); |
48842b30 | 3565 | |
d0b96690 | 3566 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3567 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3568 | sizeof(uchan->name))) { | |
3569 | struct ustctl_consumer_channel_attr attr; | |
3570 | copy_channel_attr_to_ustctl(&attr, &uchan->attr); | |
3571 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
3572 | &attr); | |
3573 | } else { | |
3574 | /* Create channel onto application. We don't need the chan ref. */ | |
3575 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3576 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3577 | } | |
d0b96690 | 3578 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3579 | if (ret < 0) { |
3580 | if (ret == -ENOMEM) { | |
3581 | /* No more memory is a fatal error. Stop right now. */ | |
3582 | goto error_rcu_unlock; | |
3583 | } | |
3584 | /* Cleanup the created session if it's the case. */ | |
3585 | if (created) { | |
d0b96690 | 3586 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3587 | } |
48842b30 | 3588 | } |
48842b30 | 3589 | } |
5b4a0ec0 | 3590 | |
95e047ff | 3591 | error_rcu_unlock: |
48842b30 | 3592 | rcu_read_unlock(); |
3c14c33f | 3593 | return ret; |
48842b30 DG |
3594 | } |
3595 | ||
5b4a0ec0 | 3596 | /* |
edb67388 | 3597 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3598 | */ |
35a9059d | 3599 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3600 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3601 | { | |
3602 | int ret = 0; | |
bec39940 | 3603 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3604 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3605 | struct ust_app *app; |
3606 | struct ust_app_session *ua_sess; | |
3607 | struct ust_app_channel *ua_chan; | |
3608 | struct ust_app_event *ua_event; | |
48842b30 | 3609 | |
d9bf3ca4 | 3610 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3611 | uevent->attr.name, usess->id); |
48842b30 | 3612 | |
edb67388 DG |
3613 | /* |
3614 | * NOTE: At this point, this function is called only if the session and | |
3615 | * channel passed are already created for all apps. and enabled on the | |
3616 | * tracer also. | |
3617 | */ | |
3618 | ||
48842b30 | 3619 | rcu_read_lock(); |
421cb601 DG |
3620 | |
3621 | /* For all registered applications */ | |
852d0037 | 3622 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3623 | if (!app->compatible) { |
3624 | /* | |
3625 | * TODO: In time, we should notice the caller of this error by | |
3626 | * telling him that this is a version error. | |
3627 | */ | |
3628 | continue; | |
3629 | } | |
edb67388 | 3630 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3631 | if (!ua_sess) { |
3632 | /* The application has problem or is probably dead. */ | |
3633 | continue; | |
3634 | } | |
ba767faf | 3635 | |
d0b96690 DG |
3636 | pthread_mutex_lock(&ua_sess->lock); |
3637 | ||
edb67388 | 3638 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3639 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3640 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3641 | /* If the channel is not found, there is a code flow error */ |
3642 | assert(ua_chan_node); | |
3643 | ||
3644 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3645 | ||
18eace3b DG |
3646 | /* Get event node */ |
3647 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
3648 | uevent->filter, uevent->attr.loglevel); | |
3649 | if (ua_event == NULL) { | |
7f79d3a1 | 3650 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3651 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3652 | goto next_app; |
35a9059d | 3653 | } |
35a9059d DG |
3654 | |
3655 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3656 | if (ret < 0) { | |
d0b96690 | 3657 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3658 | goto error; |
48842b30 | 3659 | } |
d0b96690 DG |
3660 | next_app: |
3661 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3662 | } |
3663 | ||
7f79d3a1 | 3664 | error: |
edb67388 | 3665 | rcu_read_unlock(); |
edb67388 DG |
3666 | return ret; |
3667 | } | |
3668 | ||
3669 | /* | |
3670 | * For a specific existing UST session and UST channel, creates the event for | |
3671 | * all registered apps. | |
3672 | */ | |
35a9059d | 3673 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3674 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3675 | { | |
3676 | int ret = 0; | |
bec39940 DG |
3677 | struct lttng_ht_iter iter, uiter; |
3678 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3679 | struct ust_app *app; |
3680 | struct ust_app_session *ua_sess; | |
3681 | struct ust_app_channel *ua_chan; | |
3682 | ||
d9bf3ca4 | 3683 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3684 | uevent->attr.name, usess->id); |
edb67388 | 3685 | |
edb67388 DG |
3686 | rcu_read_lock(); |
3687 | ||
3688 | /* For all registered applications */ | |
852d0037 | 3689 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3690 | if (!app->compatible) { |
3691 | /* | |
3692 | * TODO: In time, we should notice the caller of this error by | |
3693 | * telling him that this is a version error. | |
3694 | */ | |
3695 | continue; | |
3696 | } | |
edb67388 | 3697 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3698 | if (!ua_sess) { |
3699 | /* The application has problem or is probably dead. */ | |
3700 | continue; | |
3701 | } | |
48842b30 | 3702 | |
d0b96690 | 3703 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3704 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3705 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3706 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3707 | /* If the channel is not found, there is a code flow error */ |
3708 | assert(ua_chan_node); | |
3709 | ||
48842b30 DG |
3710 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3711 | ||
edb67388 | 3712 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3713 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3714 | if (ret < 0) { |
49c336c1 | 3715 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3716 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3717 | break; | |
3718 | } | |
3719 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3720 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3721 | continue; |
48842b30 | 3722 | } |
48842b30 | 3723 | } |
5b4a0ec0 | 3724 | |
48842b30 DG |
3725 | rcu_read_unlock(); |
3726 | ||
3727 | return ret; | |
3728 | } | |
3729 | ||
5b4a0ec0 DG |
3730 | /* |
3731 | * Start tracing for a specific UST session and app. | |
3732 | */ | |
b34cbebf | 3733 | static |
421cb601 | 3734 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3735 | { |
3736 | int ret = 0; | |
48842b30 | 3737 | struct ust_app_session *ua_sess; |
48842b30 | 3738 | |
852d0037 | 3739 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3740 | |
509cbaf8 MD |
3741 | rcu_read_lock(); |
3742 | ||
e0c7ec2b DG |
3743 | if (!app->compatible) { |
3744 | goto end; | |
3745 | } | |
3746 | ||
421cb601 DG |
3747 | ua_sess = lookup_session_by_app(usess, app); |
3748 | if (ua_sess == NULL) { | |
d42f20df DG |
3749 | /* The session is in teardown process. Ignore and continue. */ |
3750 | goto end; | |
421cb601 | 3751 | } |
48842b30 | 3752 | |
d0b96690 DG |
3753 | pthread_mutex_lock(&ua_sess->lock); |
3754 | ||
aea829b3 DG |
3755 | /* Upon restart, we skip the setup, already done */ |
3756 | if (ua_sess->started) { | |
8be98f9a | 3757 | goto skip_setup; |
aea829b3 | 3758 | } |
8be98f9a | 3759 | |
a4b92340 DG |
3760 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3761 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3762 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3763 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3764 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3765 | if (ret < 0) { |
3766 | if (ret != -EEXIST) { | |
3767 | ERR("Trace directory creation error"); | |
d0b96690 | 3768 | goto error_unlock; |
421cb601 | 3769 | } |
173af62f | 3770 | } |
7753dea8 | 3771 | } |
aea829b3 | 3772 | |
d65d2de8 DG |
3773 | /* |
3774 | * Create the metadata for the application. This returns gracefully if a | |
3775 | * metadata was already set for the session. | |
3776 | */ | |
3777 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, NULL); | |
421cb601 | 3778 | if (ret < 0) { |
d0b96690 | 3779 | goto error_unlock; |
421cb601 | 3780 | } |
48842b30 | 3781 | |
840cb59c | 3782 | health_code_update(); |
86acf0da | 3783 | |
8be98f9a | 3784 | skip_setup: |
421cb601 | 3785 | /* This start the UST tracing */ |
852d0037 | 3786 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3787 | if (ret < 0) { |
ffe60014 DG |
3788 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3789 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3790 | app->pid, ret); | |
3791 | } else { | |
3792 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
3793 | /* |
3794 | * This is normal behavior, an application can die during the | |
3795 | * creation process. Don't report an error so the execution can | |
3796 | * continue normally. | |
3797 | */ | |
3798 | pthread_mutex_unlock(&ua_sess->lock); | |
3799 | goto end; | |
ffe60014 | 3800 | } |
d0b96690 | 3801 | goto error_unlock; |
421cb601 | 3802 | } |
5b4a0ec0 | 3803 | |
55c3953d DG |
3804 | /* Indicate that the session has been started once */ |
3805 | ua_sess->started = 1; | |
3806 | ||
d0b96690 DG |
3807 | pthread_mutex_unlock(&ua_sess->lock); |
3808 | ||
840cb59c | 3809 | health_code_update(); |
86acf0da | 3810 | |
421cb601 | 3811 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3812 | ret = ustctl_wait_quiescent(app->sock); |
3813 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3814 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3815 | app->pid, ret); | |
3816 | } | |
48842b30 | 3817 | |
e0c7ec2b DG |
3818 | end: |
3819 | rcu_read_unlock(); | |
840cb59c | 3820 | health_code_update(); |
421cb601 | 3821 | return 0; |
48842b30 | 3822 | |
d0b96690 DG |
3823 | error_unlock: |
3824 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3825 | rcu_read_unlock(); |
840cb59c | 3826 | health_code_update(); |
421cb601 DG |
3827 | return -1; |
3828 | } | |
48842b30 | 3829 | |
8be98f9a MD |
3830 | /* |
3831 | * Stop tracing for a specific UST session and app. | |
3832 | */ | |
b34cbebf | 3833 | static |
8be98f9a MD |
3834 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3835 | { | |
3836 | int ret = 0; | |
3837 | struct ust_app_session *ua_sess; | |
7972aab2 | 3838 | struct ust_registry_session *registry; |
8be98f9a | 3839 | |
852d0037 | 3840 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3841 | |
3842 | rcu_read_lock(); | |
3843 | ||
e0c7ec2b | 3844 | if (!app->compatible) { |
d88aee68 | 3845 | goto end_no_session; |
e0c7ec2b DG |
3846 | } |
3847 | ||
8be98f9a MD |
3848 | ua_sess = lookup_session_by_app(usess, app); |
3849 | if (ua_sess == NULL) { | |
d88aee68 | 3850 | goto end_no_session; |
8be98f9a MD |
3851 | } |
3852 | ||
d88aee68 DG |
3853 | pthread_mutex_lock(&ua_sess->lock); |
3854 | ||
9bc07046 DG |
3855 | /* |
3856 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3857 | * that was never started. It's possible since we can have a fail start |
3858 | * from either the application manager thread or the command thread. Simply | |
3859 | * indicate that this is a stop error. | |
9bc07046 | 3860 | */ |
f9dfc3d9 | 3861 | if (!ua_sess->started) { |
c45536e1 DG |
3862 | goto error_rcu_unlock; |
3863 | } | |
7db205b5 | 3864 | |
840cb59c | 3865 | health_code_update(); |
86acf0da | 3866 | |
9d6c7d3f | 3867 | /* This inhibits UST tracing */ |
852d0037 | 3868 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3869 | if (ret < 0) { |
ffe60014 DG |
3870 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3871 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3872 | app->pid, ret); | |
3873 | } else { | |
3874 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
3875 | /* |
3876 | * This is normal behavior, an application can die during the | |
3877 | * creation process. Don't report an error so the execution can | |
3878 | * continue normally. | |
3879 | */ | |
3880 | goto end_unlock; | |
ffe60014 | 3881 | } |
9d6c7d3f DG |
3882 | goto error_rcu_unlock; |
3883 | } | |
3884 | ||
840cb59c | 3885 | health_code_update(); |
86acf0da | 3886 | |
9d6c7d3f | 3887 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3888 | ret = ustctl_wait_quiescent(app->sock); |
3889 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3890 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3891 | app->pid, ret); | |
3892 | } | |
9d6c7d3f | 3893 | |
840cb59c | 3894 | health_code_update(); |
86acf0da | 3895 | |
b34cbebf MD |
3896 | registry = get_session_registry(ua_sess); |
3897 | assert(registry); | |
1b532a60 DG |
3898 | |
3899 | if (!registry->metadata_closed) { | |
3900 | /* Push metadata for application before freeing the application. */ | |
3901 | (void) push_metadata(registry, ua_sess->consumer); | |
3902 | } | |
b34cbebf | 3903 | |
3757b385 | 3904 | end_unlock: |
b34cbebf MD |
3905 | pthread_mutex_unlock(&ua_sess->lock); |
3906 | end_no_session: | |
3907 | rcu_read_unlock(); | |
3908 | health_code_update(); | |
3909 | return 0; | |
3910 | ||
3911 | error_rcu_unlock: | |
3912 | pthread_mutex_unlock(&ua_sess->lock); | |
3913 | rcu_read_unlock(); | |
3914 | health_code_update(); | |
3915 | return -1; | |
3916 | } | |
3917 | ||
3918 | /* | |
3919 | * Flush buffers for a specific UST session and app. | |
3920 | */ | |
3921 | static | |
3922 | int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
3923 | { | |
3924 | int ret = 0; | |
3925 | struct lttng_ht_iter iter; | |
3926 | struct ust_app_session *ua_sess; | |
3927 | struct ust_app_channel *ua_chan; | |
3928 | ||
3929 | DBG("Flushing buffers for ust app pid %d", app->pid); | |
3930 | ||
3931 | rcu_read_lock(); | |
3932 | ||
3933 | if (!app->compatible) { | |
3934 | goto end_no_session; | |
3935 | } | |
3936 | ||
3937 | ua_sess = lookup_session_by_app(usess, app); | |
3938 | if (ua_sess == NULL) { | |
3939 | goto end_no_session; | |
3940 | } | |
3941 | ||
3942 | pthread_mutex_lock(&ua_sess->lock); | |
3943 | ||
3944 | health_code_update(); | |
3945 | ||
9d6c7d3f | 3946 | /* Flushing buffers */ |
bec39940 DG |
3947 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
3948 | node.node) { | |
840cb59c | 3949 | health_code_update(); |
ffe60014 | 3950 | assert(ua_chan->is_sent); |
852d0037 | 3951 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 3952 | if (ret < 0) { |
ffe60014 DG |
3953 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3954 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
3955 | app->pid, ua_chan->name, ret); | |
3956 | } else { | |
3957 | DBG3("UST app failed to flush %s. Application is dead.", | |
3958 | ua_chan->name); | |
3757b385 DG |
3959 | /* |
3960 | * This is normal behavior, an application can die during the | |
3961 | * creation process. Don't report an error so the execution can | |
3962 | * continue normally. | |
3963 | */ | |
ffe60014 | 3964 | } |
6d3686da DG |
3965 | /* Continuing flushing all buffers */ |
3966 | continue; | |
8be98f9a MD |
3967 | } |
3968 | } | |
8be98f9a | 3969 | |
840cb59c | 3970 | health_code_update(); |
86acf0da | 3971 | |
d88aee68 DG |
3972 | pthread_mutex_unlock(&ua_sess->lock); |
3973 | end_no_session: | |
7db205b5 | 3974 | rcu_read_unlock(); |
840cb59c | 3975 | health_code_update(); |
8be98f9a | 3976 | return 0; |
8be98f9a MD |
3977 | } |
3978 | ||
84cd17c6 MD |
3979 | /* |
3980 | * Destroy a specific UST session in apps. | |
3981 | */ | |
3353de95 | 3982 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 3983 | { |
ffe60014 | 3984 | int ret; |
84cd17c6 | 3985 | struct ust_app_session *ua_sess; |
bec39940 | 3986 | struct lttng_ht_iter iter; |
d9bf3ca4 | 3987 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 3988 | |
852d0037 | 3989 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
3990 | |
3991 | rcu_read_lock(); | |
3992 | ||
e0c7ec2b DG |
3993 | if (!app->compatible) { |
3994 | goto end; | |
3995 | } | |
3996 | ||
84cd17c6 | 3997 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 3998 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 3999 | if (node == NULL) { |
d42f20df DG |
4000 | /* Session is being or is deleted. */ |
4001 | goto end; | |
84cd17c6 MD |
4002 | } |
4003 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4004 | |
840cb59c | 4005 | health_code_update(); |
d0b96690 | 4006 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4007 | |
840cb59c | 4008 | health_code_update(); |
7db205b5 | 4009 | |
84cd17c6 | 4010 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4011 | ret = ustctl_wait_quiescent(app->sock); |
4012 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4013 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4014 | app->pid, ret); | |
4015 | } | |
e0c7ec2b DG |
4016 | end: |
4017 | rcu_read_unlock(); | |
840cb59c | 4018 | health_code_update(); |
84cd17c6 | 4019 | return 0; |
84cd17c6 MD |
4020 | } |
4021 | ||
5b4a0ec0 DG |
4022 | /* |
4023 | * Start tracing for the UST session. | |
4024 | */ | |
421cb601 DG |
4025 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4026 | { | |
4027 | int ret = 0; | |
bec39940 | 4028 | struct lttng_ht_iter iter; |
421cb601 | 4029 | struct ust_app *app; |
48842b30 | 4030 | |
421cb601 DG |
4031 | DBG("Starting all UST traces"); |
4032 | ||
4033 | rcu_read_lock(); | |
421cb601 | 4034 | |
852d0037 | 4035 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4036 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4037 | if (ret < 0) { |
5b4a0ec0 DG |
4038 | /* Continue to next apps even on error */ |
4039 | continue; | |
48842b30 | 4040 | } |
48842b30 | 4041 | } |
5b4a0ec0 | 4042 | |
48842b30 DG |
4043 | rcu_read_unlock(); |
4044 | ||
4045 | return 0; | |
4046 | } | |
487cf67c | 4047 | |
8be98f9a MD |
4048 | /* |
4049 | * Start tracing for the UST session. | |
4050 | */ | |
4051 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4052 | { | |
4053 | int ret = 0; | |
bec39940 | 4054 | struct lttng_ht_iter iter; |
8be98f9a MD |
4055 | struct ust_app *app; |
4056 | ||
4057 | DBG("Stopping all UST traces"); | |
4058 | ||
4059 | rcu_read_lock(); | |
4060 | ||
b34cbebf MD |
4061 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4062 | ret = ust_app_stop_trace(usess, app); | |
4063 | if (ret < 0) { | |
4064 | /* Continue to next apps even on error */ | |
4065 | continue; | |
4066 | } | |
4067 | } | |
4068 | ||
b0a5f0fb | 4069 | /* Flush buffers and push metadata (for UID buffers). */ |
b34cbebf MD |
4070 | switch (usess->buffer_type) { |
4071 | case LTTNG_BUFFER_PER_UID: | |
4072 | { | |
7972aab2 | 4073 | struct buffer_reg_uid *reg; |
b34cbebf MD |
4074 | |
4075 | /* Flush all per UID buffers associated to that session. */ | |
7972aab2 | 4076 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
b0a5f0fb | 4077 | struct ust_registry_session *ust_session_reg; |
7972aab2 DG |
4078 | struct buffer_reg_channel *reg_chan; |
4079 | struct consumer_socket *socket; | |
4080 | ||
4081 | /* Get consumer socket to use to push the metadata.*/ | |
4082 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4083 | usess->consumer); | |
4084 | if (!socket) { | |
4085 | /* Ignore request if no consumer is found for the session. */ | |
4086 | continue; | |
4087 | } | |
4088 | ||
4089 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4090 | reg_chan, node.node) { | |
4091 | /* | |
4092 | * The following call will print error values so the return | |
4093 | * code is of little importance because whatever happens, we | |
4094 | * have to try them all. | |
4095 | */ | |
4096 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4097 | } | |
b0a5f0fb MD |
4098 | |
4099 | ust_session_reg = reg->registry->reg.ust; | |
4100 | if (!ust_session_reg->metadata_closed) { | |
4101 | /* Push metadata. */ | |
4102 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4103 | } | |
7972aab2 | 4104 | } |
b0a5f0fb | 4105 | |
b34cbebf | 4106 | break; |
7972aab2 | 4107 | } |
b34cbebf MD |
4108 | case LTTNG_BUFFER_PER_PID: |
4109 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4110 | ret = ust_app_flush_trace(usess, app); | |
4111 | if (ret < 0) { | |
4112 | /* Continue to next apps even on error */ | |
4113 | continue; | |
4114 | } | |
8be98f9a | 4115 | } |
b34cbebf MD |
4116 | break; |
4117 | default: | |
4118 | assert(0); | |
4119 | break; | |
8be98f9a MD |
4120 | } |
4121 | ||
4122 | rcu_read_unlock(); | |
4123 | ||
4124 | return 0; | |
4125 | } | |
4126 | ||
84cd17c6 MD |
4127 | /* |
4128 | * Destroy app UST session. | |
4129 | */ | |
4130 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4131 | { | |
4132 | int ret = 0; | |
bec39940 | 4133 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4134 | struct ust_app *app; |
4135 | ||
4136 | DBG("Destroy all UST traces"); | |
4137 | ||
4138 | rcu_read_lock(); | |
4139 | ||
852d0037 | 4140 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4141 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4142 | if (ret < 0) { |
4143 | /* Continue to next apps even on error */ | |
4144 | continue; | |
4145 | } | |
4146 | } | |
4147 | ||
4148 | rcu_read_unlock(); | |
4149 | ||
4150 | return 0; | |
4151 | } | |
4152 | ||
5b4a0ec0 DG |
4153 | /* |
4154 | * Add channels/events from UST global domain to registered apps at sock. | |
4155 | */ | |
487cf67c DG |
4156 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4157 | { | |
55c54cce | 4158 | int ret = 0; |
31746f93 | 4159 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4160 | struct ust_app *app; |
3d8ca23b | 4161 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4162 | struct ust_app_channel *ua_chan; |
4163 | struct ust_app_event *ua_event; | |
727d5404 | 4164 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4165 | |
95e047ff | 4166 | assert(usess); |
ffe60014 | 4167 | assert(sock >= 0); |
1f3580c7 | 4168 | |
d9bf3ca4 | 4169 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4170 | usess->id); |
487cf67c | 4171 | |
284d8f55 DG |
4172 | rcu_read_lock(); |
4173 | ||
487cf67c DG |
4174 | app = find_app_by_sock(sock); |
4175 | if (app == NULL) { | |
d88aee68 DG |
4176 | /* |
4177 | * Application can be unregistered before so this is possible hence | |
4178 | * simply stopping the update. | |
4179 | */ | |
4180 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4181 | goto error; |
4182 | } | |
4183 | ||
e0c7ec2b DG |
4184 | if (!app->compatible) { |
4185 | goto error; | |
4186 | } | |
4187 | ||
3d8ca23b DG |
4188 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4189 | if (ret < 0) { | |
4190 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4191 | goto error; |
4192 | } | |
3d8ca23b | 4193 | assert(ua_sess); |
487cf67c | 4194 | |
d0b96690 DG |
4195 | pthread_mutex_lock(&ua_sess->lock); |
4196 | ||
284d8f55 | 4197 | /* |
d0b96690 | 4198 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4199 | * app session above made a shadow copy of the UST global domain from the |
4200 | * ltt ust session. | |
4201 | */ | |
bec39940 DG |
4202 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4203 | node.node) { | |
d65d2de8 DG |
4204 | /* |
4205 | * For a metadata channel, handle it differently. | |
4206 | */ | |
4207 | if (!strncmp(ua_chan->name, DEFAULT_METADATA_NAME, | |
4208 | sizeof(ua_chan->name))) { | |
4209 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
4210 | &ua_chan->attr); | |
c7a339aa DG |
4211 | if (ret < 0) { |
4212 | goto error_unlock; | |
4213 | } | |
d65d2de8 DG |
4214 | /* Remove it from the hash table and continue!. */ |
4215 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
4216 | assert(!ret); | |
4217 | delete_ust_app_channel(-1, ua_chan, app); | |
4218 | continue; | |
4219 | } else { | |
4220 | ret = do_create_channel(app, usess, ua_sess, ua_chan); | |
c7a339aa DG |
4221 | if (ret < 0) { |
4222 | /* | |
4223 | * Stop everything. On error, the application failed, no more | |
4224 | * file descriptor are available or ENOMEM so stopping here is | |
4225 | * the only thing we can do for now. | |
4226 | */ | |
4227 | goto error_unlock; | |
4228 | } | |
487cf67c DG |
4229 | } |
4230 | ||
31746f93 DG |
4231 | /* |
4232 | * Add context using the list so they are enabled in the same order the | |
4233 | * user added them. | |
4234 | */ | |
4235 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4236 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4237 | if (ret < 0) { | |
d0b96690 | 4238 | goto error_unlock; |
727d5404 DG |
4239 | } |
4240 | } | |
4241 | ||
4242 | ||
284d8f55 | 4243 | /* For each events */ |
bec39940 DG |
4244 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4245 | node.node) { | |
284d8f55 DG |
4246 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4247 | if (ret < 0) { | |
d0b96690 | 4248 | goto error_unlock; |
487cf67c | 4249 | } |
36dc12cc | 4250 | } |
487cf67c DG |
4251 | } |
4252 | ||
d0b96690 DG |
4253 | pthread_mutex_unlock(&ua_sess->lock); |
4254 | ||
36dc12cc | 4255 | if (usess->start_trace) { |
421cb601 | 4256 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4257 | if (ret < 0) { |
36dc12cc DG |
4258 | goto error; |
4259 | } | |
4260 | ||
852d0037 | 4261 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4262 | } |
4263 | ||
ffe60014 DG |
4264 | /* Everything went well at this point. */ |
4265 | rcu_read_unlock(); | |
4266 | return; | |
4267 | ||
d0b96690 DG |
4268 | error_unlock: |
4269 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4270 | error: |
ffe60014 | 4271 | if (ua_sess) { |
d0b96690 | 4272 | destroy_app_session(app, ua_sess); |
ffe60014 | 4273 | } |
487cf67c DG |
4274 | rcu_read_unlock(); |
4275 | return; | |
4276 | } | |
55cc08a6 DG |
4277 | |
4278 | /* | |
4279 | * Add context to a specific channel for global UST domain. | |
4280 | */ | |
4281 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4282 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4283 | { | |
4284 | int ret = 0; | |
bec39940 DG |
4285 | struct lttng_ht_node_str *ua_chan_node; |
4286 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4287 | struct ust_app_channel *ua_chan = NULL; |
4288 | struct ust_app_session *ua_sess; | |
4289 | struct ust_app *app; | |
4290 | ||
4291 | rcu_read_lock(); | |
4292 | ||
852d0037 | 4293 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4294 | if (!app->compatible) { |
4295 | /* | |
4296 | * TODO: In time, we should notice the caller of this error by | |
4297 | * telling him that this is a version error. | |
4298 | */ | |
4299 | continue; | |
4300 | } | |
55cc08a6 DG |
4301 | ua_sess = lookup_session_by_app(usess, app); |
4302 | if (ua_sess == NULL) { | |
4303 | continue; | |
4304 | } | |
4305 | ||
d0b96690 | 4306 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4307 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4308 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4309 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4310 | if (ua_chan_node == NULL) { |
d0b96690 | 4311 | goto next_app; |
55cc08a6 DG |
4312 | } |
4313 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4314 | node); | |
55cc08a6 DG |
4315 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4316 | if (ret < 0) { | |
d0b96690 | 4317 | goto next_app; |
55cc08a6 | 4318 | } |
d0b96690 DG |
4319 | next_app: |
4320 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4321 | } |
4322 | ||
55cc08a6 DG |
4323 | rcu_read_unlock(); |
4324 | return ret; | |
4325 | } | |
4326 | ||
76d45b40 DG |
4327 | /* |
4328 | * Enable event for a channel from a UST session for a specific PID. | |
4329 | */ | |
4330 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4331 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4332 | { | |
4333 | int ret = 0; | |
bec39940 | 4334 | struct lttng_ht_iter iter; |
18eace3b | 4335 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4336 | struct ust_app *app; |
4337 | struct ust_app_session *ua_sess; | |
4338 | struct ust_app_channel *ua_chan; | |
4339 | struct ust_app_event *ua_event; | |
4340 | ||
4341 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4342 | ||
4343 | rcu_read_lock(); | |
4344 | ||
4345 | app = ust_app_find_by_pid(pid); | |
4346 | if (app == NULL) { | |
4347 | ERR("UST app enable event per PID %d not found", pid); | |
4348 | ret = -1; | |
d0b96690 | 4349 | goto end; |
76d45b40 DG |
4350 | } |
4351 | ||
e0c7ec2b DG |
4352 | if (!app->compatible) { |
4353 | ret = 0; | |
d0b96690 | 4354 | goto end; |
e0c7ec2b DG |
4355 | } |
4356 | ||
76d45b40 | 4357 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4358 | if (!ua_sess) { |
4359 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4360 | ret = 0; |
4361 | goto end; | |
c4a1715b | 4362 | } |
76d45b40 | 4363 | |
d0b96690 | 4364 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4365 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4366 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4367 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4368 | /* If the channel is not found, there is a code flow error */ |
4369 | assert(ua_chan_node); | |
4370 | ||
4371 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4372 | ||
18eace3b DG |
4373 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4374 | uevent->filter, uevent->attr.loglevel); | |
4375 | if (ua_event == NULL) { | |
76d45b40 DG |
4376 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4377 | if (ret < 0) { | |
d0b96690 | 4378 | goto end_unlock; |
76d45b40 DG |
4379 | } |
4380 | } else { | |
76d45b40 DG |
4381 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4382 | if (ret < 0) { | |
d0b96690 | 4383 | goto end_unlock; |
76d45b40 DG |
4384 | } |
4385 | } | |
4386 | ||
d0b96690 DG |
4387 | end_unlock: |
4388 | pthread_mutex_unlock(&ua_sess->lock); | |
4389 | end: | |
76d45b40 DG |
4390 | rcu_read_unlock(); |
4391 | return ret; | |
4392 | } | |
7f79d3a1 DG |
4393 | |
4394 | /* | |
4395 | * Disable event for a channel from a UST session for a specific PID. | |
4396 | */ | |
4397 | int ust_app_disable_event_pid(struct ltt_ust_session *usess, | |
4398 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4399 | { | |
4400 | int ret = 0; | |
bec39940 DG |
4401 | struct lttng_ht_iter iter; |
4402 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
7f79d3a1 DG |
4403 | struct ust_app *app; |
4404 | struct ust_app_session *ua_sess; | |
4405 | struct ust_app_channel *ua_chan; | |
4406 | struct ust_app_event *ua_event; | |
4407 | ||
4408 | DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); | |
4409 | ||
4410 | rcu_read_lock(); | |
4411 | ||
4412 | app = ust_app_find_by_pid(pid); | |
4413 | if (app == NULL) { | |
4414 | ERR("UST app disable event per PID %d not found", pid); | |
4415 | ret = -1; | |
4416 | goto error; | |
4417 | } | |
4418 | ||
e0c7ec2b DG |
4419 | if (!app->compatible) { |
4420 | ret = 0; | |
4421 | goto error; | |
4422 | } | |
4423 | ||
7f79d3a1 | 4424 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4425 | if (!ua_sess) { |
4426 | /* The application has problem or is probably dead. */ | |
4427 | goto error; | |
4428 | } | |
7f79d3a1 DG |
4429 | |
4430 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4431 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4432 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4433 | if (ua_chan_node == NULL) { |
4434 | /* Channel does not exist, skip disabling */ | |
4435 | goto error; | |
4436 | } | |
4437 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4438 | ||
bec39940 DG |
4439 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); |
4440 | ua_event_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4441 | if (ua_event_node == NULL) { |
4442 | /* Event does not exist, skip disabling */ | |
4443 | goto error; | |
4444 | } | |
4445 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
4446 | ||
4447 | ret = disable_ust_app_event(ua_sess, ua_event, app); | |
4448 | if (ret < 0) { | |
4449 | goto error; | |
4450 | } | |
4451 | ||
4452 | error: | |
4453 | rcu_read_unlock(); | |
4454 | return ret; | |
4455 | } | |
e0c7ec2b | 4456 | |
4466912f DG |
4457 | /* |
4458 | * Calibrate registered applications. | |
4459 | */ | |
4460 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4461 | { | |
4462 | int ret = 0; | |
4463 | struct lttng_ht_iter iter; | |
4464 | struct ust_app *app; | |
4465 | ||
4466 | rcu_read_lock(); | |
4467 | ||
852d0037 | 4468 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4469 | if (!app->compatible) { |
4470 | /* | |
4471 | * TODO: In time, we should notice the caller of this error by | |
4472 | * telling him that this is a version error. | |
4473 | */ | |
4474 | continue; | |
4475 | } | |
4476 | ||
840cb59c | 4477 | health_code_update(); |
86acf0da | 4478 | |
852d0037 | 4479 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4480 | if (ret < 0) { |
4481 | switch (ret) { | |
4482 | case -ENOSYS: | |
4483 | /* Means that it's not implemented on the tracer side. */ | |
4484 | ret = 0; | |
4485 | break; | |
4486 | default: | |
4466912f | 4487 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4488 | app->pid, ret); |
4466912f DG |
4489 | break; |
4490 | } | |
4491 | } | |
4492 | } | |
4493 | ||
4494 | DBG("UST app global domain calibration finished"); | |
4495 | ||
4496 | rcu_read_unlock(); | |
4497 | ||
840cb59c | 4498 | health_code_update(); |
86acf0da | 4499 | |
4466912f DG |
4500 | return ret; |
4501 | } | |
d0b96690 DG |
4502 | |
4503 | /* | |
4504 | * Receive registration and populate the given msg structure. | |
4505 | * | |
4506 | * On success return 0 else a negative value returned by the ustctl call. | |
4507 | */ | |
4508 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4509 | { | |
4510 | int ret; | |
4511 | uint32_t pid, ppid, uid, gid; | |
4512 | ||
4513 | assert(msg); | |
4514 | ||
4515 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4516 | &pid, &ppid, &uid, &gid, | |
4517 | &msg->bits_per_long, | |
4518 | &msg->uint8_t_alignment, | |
4519 | &msg->uint16_t_alignment, | |
4520 | &msg->uint32_t_alignment, | |
4521 | &msg->uint64_t_alignment, | |
4522 | &msg->long_alignment, | |
4523 | &msg->byte_order, | |
4524 | msg->name); | |
4525 | if (ret < 0) { | |
4526 | switch (-ret) { | |
4527 | case EPIPE: | |
4528 | case ECONNRESET: | |
4529 | case LTTNG_UST_ERR_EXITING: | |
4530 | DBG3("UST app recv reg message failed. Application died"); | |
4531 | break; | |
4532 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4533 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4534 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4535 | LTTNG_UST_ABI_MINOR_VERSION); | |
4536 | break; | |
4537 | default: | |
4538 | ERR("UST app recv reg message failed with ret %d", ret); | |
4539 | break; | |
4540 | } | |
4541 | goto error; | |
4542 | } | |
4543 | msg->pid = (pid_t) pid; | |
4544 | msg->ppid = (pid_t) ppid; | |
4545 | msg->uid = (uid_t) uid; | |
4546 | msg->gid = (gid_t) gid; | |
4547 | ||
4548 | error: | |
4549 | return ret; | |
4550 | } | |
4551 | ||
d88aee68 DG |
4552 | /* |
4553 | * Return a ust app channel object using the application object and the channel | |
4554 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4555 | * lock MUST be acquired before calling this function. | |
4556 | */ | |
d0b96690 DG |
4557 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4558 | int objd) | |
4559 | { | |
4560 | struct lttng_ht_node_ulong *node; | |
4561 | struct lttng_ht_iter iter; | |
4562 | struct ust_app_channel *ua_chan = NULL; | |
4563 | ||
4564 | assert(app); | |
4565 | ||
4566 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4567 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4568 | if (node == NULL) { | |
4569 | DBG2("UST app channel find by objd %d not found", objd); | |
4570 | goto error; | |
4571 | } | |
4572 | ||
4573 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4574 | ||
4575 | error: | |
4576 | return ua_chan; | |
4577 | } | |
4578 | ||
d88aee68 DG |
4579 | /* |
4580 | * Reply to a register channel notification from an application on the notify | |
4581 | * socket. The channel metadata is also created. | |
4582 | * | |
4583 | * The session UST registry lock is acquired in this function. | |
4584 | * | |
4585 | * On success 0 is returned else a negative value. | |
4586 | */ | |
d0b96690 DG |
4587 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4588 | size_t nr_fields, struct ustctl_field *fields) | |
4589 | { | |
4590 | int ret, ret_code = 0; | |
4591 | uint32_t chan_id, reg_count; | |
7972aab2 | 4592 | uint64_t chan_reg_key; |
d0b96690 DG |
4593 | enum ustctl_channel_header type; |
4594 | struct ust_app *app; | |
4595 | struct ust_app_channel *ua_chan; | |
4596 | struct ust_app_session *ua_sess; | |
7972aab2 | 4597 | struct ust_registry_session *registry; |
45893984 | 4598 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4599 | |
4600 | rcu_read_lock(); | |
4601 | ||
4602 | /* Lookup application. If not found, there is a code flow error. */ | |
4603 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4604 | if (!app) { |
4605 | DBG("Application socket %d is being teardown. Abort event notify", | |
4606 | sock); | |
4607 | ret = 0; | |
d5d629b5 | 4608 | free(fields); |
d88aee68 DG |
4609 | goto error_rcu_unlock; |
4610 | } | |
d0b96690 | 4611 | |
4950b860 | 4612 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4613 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4614 | if (!ua_chan) { |
4615 | DBG("Application channel is being teardown. Abort event notify"); | |
4616 | ret = 0; | |
d5d629b5 | 4617 | free(fields); |
4950b860 MD |
4618 | goto error_rcu_unlock; |
4619 | } | |
4620 | ||
d0b96690 DG |
4621 | assert(ua_chan->session); |
4622 | ua_sess = ua_chan->session; | |
d0b96690 | 4623 | |
7972aab2 DG |
4624 | /* Get right session registry depending on the session buffer type. */ |
4625 | registry = get_session_registry(ua_sess); | |
4626 | assert(registry); | |
45893984 | 4627 | |
7972aab2 DG |
4628 | /* Depending on the buffer type, a different channel key is used. */ |
4629 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4630 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4631 | } else { |
7972aab2 | 4632 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4633 | } |
4634 | ||
7972aab2 DG |
4635 | pthread_mutex_lock(®istry->lock); |
4636 | ||
4637 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4638 | assert(chan_reg); | |
4639 | ||
4640 | if (!chan_reg->register_done) { | |
4641 | reg_count = ust_registry_get_event_count(chan_reg); | |
4642 | if (reg_count < 31) { | |
4643 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4644 | } else { | |
4645 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4646 | } | |
4647 | ||
4648 | chan_reg->nr_ctx_fields = nr_fields; | |
4649 | chan_reg->ctx_fields = fields; | |
4650 | chan_reg->header_type = type; | |
d0b96690 | 4651 | } else { |
7972aab2 DG |
4652 | /* Get current already assigned values. */ |
4653 | type = chan_reg->header_type; | |
d5d629b5 DG |
4654 | free(fields); |
4655 | /* Set to NULL so the error path does not do a double free. */ | |
4656 | fields = NULL; | |
d0b96690 | 4657 | } |
7972aab2 DG |
4658 | /* Channel id is set during the object creation. */ |
4659 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4660 | |
4661 | /* Append to metadata */ | |
7972aab2 DG |
4662 | if (!chan_reg->metadata_dumped) { |
4663 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4664 | if (ret_code) { |
4665 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4666 | goto reply; | |
4667 | } | |
4668 | } | |
4669 | ||
4670 | reply: | |
7972aab2 DG |
4671 | DBG3("UST app replying to register channel key %" PRIu64 |
4672 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4673 | ret_code); | |
d0b96690 DG |
4674 | |
4675 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4676 | if (ret < 0) { | |
4677 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4678 | ERR("UST app reply channel failed with ret %d", ret); | |
4679 | } else { | |
4680 | DBG3("UST app reply channel failed. Application died"); | |
4681 | } | |
4682 | goto error; | |
4683 | } | |
4684 | ||
7972aab2 DG |
4685 | /* This channel registry registration is completed. */ |
4686 | chan_reg->register_done = 1; | |
4687 | ||
d0b96690 | 4688 | error: |
7972aab2 | 4689 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4690 | error_rcu_unlock: |
d0b96690 | 4691 | rcu_read_unlock(); |
d5d629b5 DG |
4692 | if (ret) { |
4693 | free(fields); | |
4694 | } | |
d0b96690 DG |
4695 | return ret; |
4696 | } | |
4697 | ||
d88aee68 DG |
4698 | /* |
4699 | * Add event to the UST channel registry. When the event is added to the | |
4700 | * registry, the metadata is also created. Once done, this replies to the | |
4701 | * application with the appropriate error code. | |
4702 | * | |
4703 | * The session UST registry lock is acquired in the function. | |
4704 | * | |
4705 | * On success 0 is returned else a negative value. | |
4706 | */ | |
d0b96690 DG |
4707 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4708 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4709 | char *model_emf_uri) | |
4710 | { | |
4711 | int ret, ret_code; | |
4712 | uint32_t event_id = 0; | |
7972aab2 | 4713 | uint64_t chan_reg_key; |
d0b96690 DG |
4714 | struct ust_app *app; |
4715 | struct ust_app_channel *ua_chan; | |
4716 | struct ust_app_session *ua_sess; | |
7972aab2 | 4717 | struct ust_registry_session *registry; |
d0b96690 DG |
4718 | |
4719 | rcu_read_lock(); | |
4720 | ||
4721 | /* Lookup application. If not found, there is a code flow error. */ | |
4722 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4723 | if (!app) { |
4724 | DBG("Application socket %d is being teardown. Abort event notify", | |
4725 | sock); | |
4726 | ret = 0; | |
d5d629b5 DG |
4727 | free(sig); |
4728 | free(fields); | |
4729 | free(model_emf_uri); | |
d88aee68 DG |
4730 | goto error_rcu_unlock; |
4731 | } | |
d0b96690 | 4732 | |
4950b860 | 4733 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4734 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4735 | if (!ua_chan) { |
4736 | DBG("Application channel is being teardown. Abort event notify"); | |
4737 | ret = 0; | |
d5d629b5 DG |
4738 | free(sig); |
4739 | free(fields); | |
4740 | free(model_emf_uri); | |
4950b860 MD |
4741 | goto error_rcu_unlock; |
4742 | } | |
4743 | ||
d0b96690 DG |
4744 | assert(ua_chan->session); |
4745 | ua_sess = ua_chan->session; | |
4746 | ||
7972aab2 DG |
4747 | registry = get_session_registry(ua_sess); |
4748 | assert(registry); | |
4749 | ||
4750 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4751 | chan_reg_key = ua_chan->tracing_channel_id; | |
4752 | } else { | |
4753 | chan_reg_key = ua_chan->key; | |
4754 | } | |
4755 | ||
4756 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4757 | |
d5d629b5 DG |
4758 | /* |
4759 | * From this point on, this call acquires the ownership of the sig, fields | |
4760 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4761 | * three variables MUST NOT be read/write after this. | |
4762 | */ | |
7972aab2 | 4763 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4764 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
8494bda5 MD |
4765 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4766 | app); | |
d0b96690 DG |
4767 | |
4768 | /* | |
4769 | * The return value is returned to ustctl so in case of an error, the | |
4770 | * application can be notified. In case of an error, it's important not to | |
4771 | * return a negative error or else the application will get closed. | |
4772 | */ | |
4773 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4774 | if (ret < 0) { | |
4775 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4776 | ERR("UST app reply event failed with ret %d", ret); | |
4777 | } else { | |
4778 | DBG3("UST app reply event failed. Application died"); | |
4779 | } | |
4780 | /* | |
4781 | * No need to wipe the create event since the application socket will | |
4782 | * get close on error hence cleaning up everything by itself. | |
4783 | */ | |
4784 | goto error; | |
4785 | } | |
4786 | ||
7972aab2 DG |
4787 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4788 | name, event_id); | |
d88aee68 | 4789 | |
d0b96690 | 4790 | error: |
7972aab2 | 4791 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4792 | error_rcu_unlock: |
d0b96690 DG |
4793 | rcu_read_unlock(); |
4794 | return ret; | |
4795 | } | |
4796 | ||
d88aee68 DG |
4797 | /* |
4798 | * Handle application notification through the given notify socket. | |
4799 | * | |
4800 | * Return 0 on success or else a negative value. | |
4801 | */ | |
d0b96690 DG |
4802 | int ust_app_recv_notify(int sock) |
4803 | { | |
4804 | int ret; | |
4805 | enum ustctl_notify_cmd cmd; | |
4806 | ||
4807 | DBG3("UST app receiving notify from sock %d", sock); | |
4808 | ||
4809 | ret = ustctl_recv_notify(sock, &cmd); | |
4810 | if (ret < 0) { | |
4811 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4812 | ERR("UST app recv notify failed with ret %d", ret); | |
4813 | } else { | |
4814 | DBG3("UST app recv notify failed. Application died"); | |
4815 | } | |
4816 | goto error; | |
4817 | } | |
4818 | ||
4819 | switch (cmd) { | |
4820 | case USTCTL_NOTIFY_CMD_EVENT: | |
4821 | { | |
4822 | int sobjd, cobjd, loglevel; | |
4823 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4824 | size_t nr_fields; | |
4825 | struct ustctl_field *fields; | |
4826 | ||
4827 | DBG2("UST app ustctl register event received"); | |
4828 | ||
4829 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4830 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4831 | if (ret < 0) { | |
4832 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4833 | ERR("UST app recv event failed with ret %d", ret); | |
4834 | } else { | |
4835 | DBG3("UST app recv event failed. Application died"); | |
4836 | } | |
4837 | goto error; | |
4838 | } | |
4839 | ||
d5d629b5 DG |
4840 | /* |
4841 | * Add event to the UST registry coming from the notify socket. This | |
4842 | * call will free if needed the sig, fields and model_emf_uri. This | |
4843 | * code path loses the ownsership of these variables and transfer them | |
4844 | * to the this function. | |
4845 | */ | |
d0b96690 DG |
4846 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4847 | fields, loglevel, model_emf_uri); | |
4848 | if (ret < 0) { | |
4849 | goto error; | |
4850 | } | |
4851 | ||
4852 | break; | |
4853 | } | |
4854 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4855 | { | |
4856 | int sobjd, cobjd; | |
4857 | size_t nr_fields; | |
4858 | struct ustctl_field *fields; | |
4859 | ||
4860 | DBG2("UST app ustctl register channel received"); | |
4861 | ||
4862 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4863 | &fields); | |
4864 | if (ret < 0) { | |
4865 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4866 | ERR("UST app recv channel failed with ret %d", ret); | |
4867 | } else { | |
4868 | DBG3("UST app recv channel failed. Application died"); | |
4869 | } | |
4870 | goto error; | |
4871 | } | |
4872 | ||
d5d629b5 DG |
4873 | /* |
4874 | * The fields ownership are transfered to this function call meaning | |
4875 | * that if needed it will be freed. After this, it's invalid to access | |
4876 | * fields or clean it up. | |
4877 | */ | |
d0b96690 DG |
4878 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4879 | fields); | |
4880 | if (ret < 0) { | |
4881 | goto error; | |
4882 | } | |
4883 | ||
4884 | break; | |
4885 | } | |
4886 | default: | |
4887 | /* Should NEVER happen. */ | |
4888 | assert(0); | |
4889 | } | |
4890 | ||
4891 | error: | |
4892 | return ret; | |
4893 | } | |
d88aee68 DG |
4894 | |
4895 | /* | |
4896 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4897 | * corresponding application. On failure, the call_rcu to close the socket is | |
4898 | * executed. If an application is found, it tries to delete it from the notify | |
4899 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4900 | * | |
4901 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4902 | * call RCU is not done but the rest of the cleanup is. | |
4903 | */ | |
4904 | void ust_app_notify_sock_unregister(int sock) | |
4905 | { | |
4906 | int err_enomem = 0; | |
4907 | struct lttng_ht_iter iter; | |
4908 | struct ust_app *app; | |
4909 | struct ust_app_notify_sock_obj *obj; | |
4910 | ||
4911 | assert(sock >= 0); | |
4912 | ||
4913 | rcu_read_lock(); | |
4914 | ||
4915 | obj = zmalloc(sizeof(*obj)); | |
4916 | if (!obj) { | |
4917 | /* | |
4918 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4919 | * procedure but the call_rcu will not be called. In this case, we | |
4920 | * accept the fd leak rather than possibly creating an unsynchronized | |
4921 | * state between threads. | |
4922 | * | |
4923 | * TODO: The notify object should be created once the notify socket is | |
4924 | * registered and stored independantely from the ust app object. The | |
4925 | * tricky part is to synchronize the teardown of the application and | |
4926 | * this notify object. Let's keep that in mind so we can avoid this | |
4927 | * kind of shenanigans with ENOMEM in the teardown path. | |
4928 | */ | |
4929 | err_enomem = 1; | |
4930 | } else { | |
4931 | obj->fd = sock; | |
4932 | } | |
4933 | ||
4934 | DBG("UST app notify socket unregister %d", sock); | |
4935 | ||
4936 | /* | |
4937 | * Lookup application by notify socket. If this fails, this means that the | |
4938 | * hash table delete has already been done by the application | |
4939 | * unregistration process so we can safely close the notify socket in a | |
4940 | * call RCU. | |
4941 | */ | |
4942 | app = find_app_by_notify_sock(sock); | |
4943 | if (!app) { | |
4944 | goto close_socket; | |
4945 | } | |
4946 | ||
4947 | iter.iter.node = &app->notify_sock_n.node; | |
4948 | ||
4949 | /* | |
4950 | * Whatever happens here either we fail or succeed, in both cases we have | |
4951 | * to close the socket after a grace period to continue to the call RCU | |
4952 | * here. If the deletion is successful, the application is not visible | |
4953 | * anymore by other threads and is it fails it means that it was already | |
4954 | * deleted from the hash table so either way we just have to close the | |
4955 | * socket. | |
4956 | */ | |
4957 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4958 | ||
4959 | close_socket: | |
4960 | rcu_read_unlock(); | |
4961 | ||
4962 | /* | |
4963 | * Close socket after a grace period to avoid for the socket to be reused | |
4964 | * before the application object is freed creating potential race between | |
4965 | * threads trying to add unique in the global hash table. | |
4966 | */ | |
4967 | if (!err_enomem) { | |
4968 | call_rcu(&obj->head, close_notify_sock_rcu); | |
4969 | } | |
4970 | } | |
f45e313d DG |
4971 | |
4972 | /* | |
4973 | * Destroy a ust app data structure and free its memory. | |
4974 | */ | |
4975 | void ust_app_destroy(struct ust_app *app) | |
4976 | { | |
4977 | if (!app) { | |
4978 | return; | |
4979 | } | |
4980 | ||
4981 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
4982 | } | |
6dc3064a DG |
4983 | |
4984 | /* | |
4985 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
4986 | * output. | |
4987 | * | |
4988 | * Return 0 on success or else a negative value. | |
4989 | */ | |
4990 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
5c786ded | 4991 | struct snapshot_output *output, int wait, unsigned int nb_streams) |
6dc3064a DG |
4992 | { |
4993 | int ret = 0; | |
4994 | struct lttng_ht_iter iter; | |
4995 | struct ust_app *app; | |
af706bb7 | 4996 | char pathname[PATH_MAX]; |
5c786ded | 4997 | uint64_t max_stream_size = 0; |
6dc3064a DG |
4998 | |
4999 | assert(usess); | |
5000 | assert(output); | |
5001 | ||
5002 | rcu_read_lock(); | |
5003 | ||
5c786ded JD |
5004 | /* |
5005 | * Compute the maximum size of a single stream if a max size is asked by | |
5006 | * the caller. | |
5007 | */ | |
5008 | if (output->max_size > 0 && nb_streams > 0) { | |
5009 | max_stream_size = output->max_size / nb_streams; | |
5010 | } | |
5011 | ||
8c924c7b MD |
5012 | switch (usess->buffer_type) { |
5013 | case LTTNG_BUFFER_PER_UID: | |
5014 | { | |
5015 | struct buffer_reg_uid *reg; | |
6dc3064a | 5016 | |
8c924c7b MD |
5017 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5018 | struct buffer_reg_channel *reg_chan; | |
5019 | struct consumer_socket *socket; | |
6dc3064a | 5020 | |
8c924c7b MD |
5021 | /* Get consumer socket to use to push the metadata.*/ |
5022 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5023 | usess->consumer); | |
5024 | if (!socket) { | |
5025 | ret = -EINVAL; | |
5026 | goto error; | |
5027 | } | |
6dc3064a | 5028 | |
8c924c7b MD |
5029 | memset(pathname, 0, sizeof(pathname)); |
5030 | ret = snprintf(pathname, sizeof(pathname), | |
5031 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5032 | reg->uid, reg->bits_per_long); | |
5033 | if (ret < 0) { | |
5034 | PERROR("snprintf snapshot path"); | |
5035 | goto error; | |
5036 | } | |
5037 | ||
5038 | /* Add the UST default trace dir to path. */ | |
5039 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5040 | reg_chan, node.node) { | |
5041 | ||
5042 | /* | |
5043 | * Make sure the maximum stream size is not lower than the | |
5044 | * subbuffer size or else it's an error since we won't be able to | |
5045 | * snapshot anything. | |
5046 | */ | |
5047 | if (max_stream_size && | |
5048 | reg_chan->subbuf_size > max_stream_size) { | |
5049 | ret = -EINVAL; | |
5050 | DBG3("UST app snapshot record maximum stream size %" PRIu64 | |
6a00837f | 5051 | " is smaller than subbuffer size of %zu", |
8c924c7b MD |
5052 | max_stream_size, reg_chan->subbuf_size); |
5053 | goto error; | |
5054 | } | |
5055 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, output, 0, | |
5056 | usess->uid, usess->gid, pathname, wait, | |
5057 | max_stream_size); | |
5058 | if (ret < 0) { | |
5059 | goto error; | |
5060 | } | |
5061 | } | |
5062 | ret = consumer_snapshot_channel(socket, reg->registry->reg.ust->metadata_key, output, | |
5063 | 1, usess->uid, usess->gid, pathname, wait, | |
5064 | max_stream_size); | |
5065 | if (ret < 0) { | |
5066 | goto error; | |
5067 | } | |
af706bb7 | 5068 | } |
8c924c7b MD |
5069 | break; |
5070 | } | |
5071 | case LTTNG_BUFFER_PER_PID: | |
5072 | { | |
5073 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5074 | struct consumer_socket *socket; | |
5075 | struct lttng_ht_iter chan_iter; | |
5076 | struct ust_app_channel *ua_chan; | |
5077 | struct ust_app_session *ua_sess; | |
5078 | struct ust_registry_session *registry; | |
5079 | ||
5080 | ua_sess = lookup_session_by_app(usess, app); | |
5081 | if (!ua_sess) { | |
5082 | /* Session not associated with this app. */ | |
5083 | continue; | |
5084 | } | |
af706bb7 | 5085 | |
8c924c7b MD |
5086 | /* Get the right consumer socket for the application. */ |
5087 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5088 | output->consumer); | |
5089 | if (!socket) { | |
5c786ded | 5090 | ret = -EINVAL; |
5c786ded JD |
5091 | goto error; |
5092 | } | |
5093 | ||
8c924c7b MD |
5094 | /* Add the UST default trace dir to path. */ |
5095 | memset(pathname, 0, sizeof(pathname)); | |
5096 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5097 | ua_sess->path); | |
6dc3064a | 5098 | if (ret < 0) { |
8c924c7b | 5099 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5100 | goto error; |
5101 | } | |
6dc3064a | 5102 | |
8c924c7b MD |
5103 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5104 | ua_chan, node.node) { | |
5105 | /* | |
5106 | * Make sure the maximum stream size is not lower than the | |
5107 | * subbuffer size or else it's an error since we won't be able to | |
5108 | * snapshot anything. | |
5109 | */ | |
5110 | if (max_stream_size && | |
5111 | ua_chan->attr.subbuf_size > max_stream_size) { | |
5112 | ret = -EINVAL; | |
5113 | DBG3("UST app snapshot record maximum stream size %" PRIu64 | |
5114 | " is smaller than subbuffer size of %" PRIu64, | |
5115 | max_stream_size, ua_chan->attr.subbuf_size); | |
5116 | goto error; | |
5117 | } | |
6dc3064a | 5118 | |
8c924c7b MD |
5119 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, 0, |
5120 | ua_sess->euid, ua_sess->egid, pathname, wait, | |
5121 | max_stream_size); | |
5122 | if (ret < 0) { | |
5123 | goto error; | |
5124 | } | |
5125 | } | |
5126 | ||
5127 | registry = get_session_registry(ua_sess); | |
5128 | assert(registry); | |
5129 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
5130 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, | |
5131 | max_stream_size); | |
5132 | if (ret < 0) { | |
5133 | goto error; | |
5134 | } | |
5135 | } | |
5136 | break; | |
5137 | } | |
5138 | default: | |
5139 | assert(0); | |
5140 | break; | |
6dc3064a DG |
5141 | } |
5142 | ||
5143 | error: | |
5144 | rcu_read_unlock(); | |
5145 | return ret; | |
5146 | } | |
5c786ded JD |
5147 | |
5148 | /* | |
5149 | * Return the number of streams for a UST session. | |
5150 | */ | |
5151 | unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess) | |
5152 | { | |
5153 | unsigned int ret = 0; | |
5154 | struct ust_app *app; | |
5155 | struct lttng_ht_iter iter; | |
5156 | ||
5157 | assert(usess); | |
5158 | ||
5159 | switch (usess->buffer_type) { | |
5160 | case LTTNG_BUFFER_PER_UID: | |
5161 | { | |
5162 | struct buffer_reg_uid *reg; | |
5163 | ||
5164 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5165 | struct buffer_reg_channel *reg_chan; | |
5166 | ||
5167 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5168 | reg_chan, node.node) { | |
5169 | ret += reg_chan->stream_count; | |
5170 | } | |
5171 | } | |
5172 | break; | |
5173 | } | |
5174 | case LTTNG_BUFFER_PER_PID: | |
5175 | { | |
5176 | rcu_read_lock(); | |
5177 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5178 | struct ust_app_channel *ua_chan; | |
5179 | struct ust_app_session *ua_sess; | |
5180 | struct lttng_ht_iter chan_iter; | |
5181 | ||
5182 | ua_sess = lookup_session_by_app(usess, app); | |
5183 | if (!ua_sess) { | |
5184 | /* Session not associated with this app. */ | |
5185 | continue; | |
5186 | } | |
5187 | ||
5188 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5189 | ua_chan, node.node) { | |
5190 | ret += ua_chan->streams.count; | |
5191 | } | |
5192 | } | |
5193 | rcu_read_unlock(); | |
5194 | break; | |
5195 | } | |
5196 | default: | |
5197 | assert(0); | |
5198 | break; | |
5199 | } | |
5200 | ||
5201 | return ret; | |
5202 | } |