Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
91d76f53 DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
16 | */ |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <errno.h> | |
7972aab2 | 20 | #include <inttypes.h> |
91d76f53 DG |
21 | #include <pthread.h> |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
099e26bd | 24 | #include <string.h> |
aba8e916 DG |
25 | #include <sys/stat.h> |
26 | #include <sys/types.h> | |
099e26bd | 27 | #include <unistd.h> |
0df502fd | 28 | #include <urcu/compiler.h> |
fb54cdbf | 29 | #include <lttng/ust-error.h> |
331744e3 | 30 | #include <signal.h> |
bec39940 | 31 | |
990570ed | 32 | #include <common/common.h> |
86acf0da | 33 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 34 | |
7972aab2 | 35 | #include "buffer-registry.h" |
86acf0da | 36 | #include "fd-limit.h" |
8782cc74 | 37 | #include "health-sessiond.h" |
56fff090 | 38 | #include "ust-app.h" |
48842b30 | 39 | #include "ust-consumer.h" |
d80a6244 | 40 | #include "ust-ctl.h" |
0b2dc8df | 41 | #include "utils.h" |
d80a6244 | 42 | |
d9bf3ca4 MD |
43 | /* Next available channel key. Access under next_channel_key_lock. */ |
44 | static uint64_t _next_channel_key; | |
45 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
46 | ||
47 | /* Next available session ID. Access under next_session_id_lock. */ | |
48 | static uint64_t _next_session_id; | |
49 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
50 | |
51 | /* | |
d9bf3ca4 | 52 | * Return the incremented value of next_channel_key. |
ffe60014 | 53 | */ |
d9bf3ca4 | 54 | static uint64_t get_next_channel_key(void) |
ffe60014 | 55 | { |
d9bf3ca4 MD |
56 | uint64_t ret; |
57 | ||
58 | pthread_mutex_lock(&next_channel_key_lock); | |
59 | ret = ++_next_channel_key; | |
60 | pthread_mutex_unlock(&next_channel_key_lock); | |
61 | return ret; | |
ffe60014 DG |
62 | } |
63 | ||
64 | /* | |
7972aab2 | 65 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 66 | */ |
d9bf3ca4 | 67 | static uint64_t get_next_session_id(void) |
ffe60014 | 68 | { |
d9bf3ca4 MD |
69 | uint64_t ret; |
70 | ||
71 | pthread_mutex_lock(&next_session_id_lock); | |
72 | ret = ++_next_session_id; | |
73 | pthread_mutex_unlock(&next_session_id_lock); | |
74 | return ret; | |
ffe60014 DG |
75 | } |
76 | ||
d65d2de8 DG |
77 | static void copy_channel_attr_to_ustctl( |
78 | struct ustctl_consumer_channel_attr *attr, | |
79 | struct lttng_ust_channel_attr *uattr) | |
80 | { | |
81 | /* Copy event attributes since the layout is different. */ | |
82 | attr->subbuf_size = uattr->subbuf_size; | |
83 | attr->num_subbuf = uattr->num_subbuf; | |
84 | attr->overwrite = uattr->overwrite; | |
85 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
86 | attr->read_timer_interval = uattr->read_timer_interval; | |
87 | attr->output = uattr->output; | |
88 | } | |
89 | ||
025faf73 DG |
90 | /* |
91 | * Match function for the hash table lookup. | |
92 | * | |
93 | * It matches an ust app event based on three attributes which are the event | |
94 | * name, the filter bytecode and the loglevel. | |
95 | */ | |
18eace3b DG |
96 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
97 | { | |
98 | struct ust_app_event *event; | |
99 | const struct ust_app_ht_key *key; | |
100 | ||
101 | assert(node); | |
102 | assert(_key); | |
103 | ||
104 | event = caa_container_of(node, struct ust_app_event, node.node); | |
105 | key = _key; | |
106 | ||
1af53eb5 | 107 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
108 | |
109 | /* Event name */ | |
110 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
111 | goto no_match; | |
112 | } | |
113 | ||
114 | /* Event loglevel. */ | |
115 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
116 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
117 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
118 | /* | |
119 | * Match is accepted. This is because on event creation, the | |
120 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
121 | * -1 are accepted for this loglevel type since 0 is the one set by | |
122 | * the API when receiving an enable event. | |
123 | */ | |
124 | } else { | |
125 | goto no_match; | |
126 | } | |
18eace3b DG |
127 | } |
128 | ||
129 | /* One of the filters is NULL, fail. */ | |
130 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
131 | goto no_match; | |
132 | } | |
133 | ||
025faf73 DG |
134 | if (key->filter && event->filter) { |
135 | /* Both filters exists, check length followed by the bytecode. */ | |
136 | if (event->filter->len != key->filter->len || | |
137 | memcmp(event->filter->data, key->filter->data, | |
138 | event->filter->len) != 0) { | |
139 | goto no_match; | |
140 | } | |
18eace3b DG |
141 | } |
142 | ||
1af53eb5 JI |
143 | /* One of the exclusions is NULL, fail. */ |
144 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
145 | goto no_match; | |
146 | } | |
147 | ||
148 | if (key->exclusion && event->exclusion) { | |
149 | /* Both exclusions exists, check count followed by the names. */ | |
150 | if (event->exclusion->count != key->exclusion->count || | |
151 | memcmp(event->exclusion->names, key->exclusion->names, | |
152 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
153 | goto no_match; | |
154 | } | |
155 | } | |
156 | ||
157 | ||
025faf73 | 158 | /* Match. */ |
18eace3b DG |
159 | return 1; |
160 | ||
161 | no_match: | |
162 | return 0; | |
18eace3b DG |
163 | } |
164 | ||
025faf73 DG |
165 | /* |
166 | * Unique add of an ust app event in the given ht. This uses the custom | |
167 | * ht_match_ust_app_event match function and the event name as hash. | |
168 | */ | |
d0b96690 | 169 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
170 | struct ust_app_event *event) |
171 | { | |
172 | struct cds_lfht_node *node_ptr; | |
173 | struct ust_app_ht_key key; | |
d0b96690 | 174 | struct lttng_ht *ht; |
18eace3b | 175 | |
d0b96690 DG |
176 | assert(ua_chan); |
177 | assert(ua_chan->events); | |
18eace3b DG |
178 | assert(event); |
179 | ||
d0b96690 | 180 | ht = ua_chan->events; |
18eace3b DG |
181 | key.name = event->attr.name; |
182 | key.filter = event->filter; | |
183 | key.loglevel = event->attr.loglevel; | |
91c89f23 | 184 | key.exclusion = event->exclusion; |
18eace3b DG |
185 | |
186 | node_ptr = cds_lfht_add_unique(ht->ht, | |
187 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
188 | ht_match_ust_app_event, &key, &event->node.node); | |
189 | assert(node_ptr == &event->node.node); | |
190 | } | |
191 | ||
d88aee68 DG |
192 | /* |
193 | * Close the notify socket from the given RCU head object. This MUST be called | |
194 | * through a call_rcu(). | |
195 | */ | |
196 | static void close_notify_sock_rcu(struct rcu_head *head) | |
197 | { | |
198 | int ret; | |
199 | struct ust_app_notify_sock_obj *obj = | |
200 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
201 | ||
202 | /* Must have a valid fd here. */ | |
203 | assert(obj->fd >= 0); | |
204 | ||
205 | ret = close(obj->fd); | |
206 | if (ret) { | |
207 | ERR("close notify sock %d RCU", obj->fd); | |
208 | } | |
209 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
210 | ||
211 | free(obj); | |
212 | } | |
213 | ||
7972aab2 DG |
214 | /* |
215 | * Return the session registry according to the buffer type of the given | |
216 | * session. | |
217 | * | |
218 | * A registry per UID object MUST exists before calling this function or else | |
219 | * it assert() if not found. RCU read side lock must be acquired. | |
220 | */ | |
221 | static struct ust_registry_session *get_session_registry( | |
222 | struct ust_app_session *ua_sess) | |
223 | { | |
224 | struct ust_registry_session *registry = NULL; | |
225 | ||
226 | assert(ua_sess); | |
227 | ||
228 | switch (ua_sess->buffer_type) { | |
229 | case LTTNG_BUFFER_PER_PID: | |
230 | { | |
231 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
232 | if (!reg_pid) { | |
233 | goto error; | |
234 | } | |
235 | registry = reg_pid->registry->reg.ust; | |
236 | break; | |
237 | } | |
238 | case LTTNG_BUFFER_PER_UID: | |
239 | { | |
240 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
241 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
242 | if (!reg_uid) { | |
243 | goto error; | |
244 | } | |
245 | registry = reg_uid->registry->reg.ust; | |
246 | break; | |
247 | } | |
248 | default: | |
249 | assert(0); | |
250 | }; | |
251 | ||
252 | error: | |
253 | return registry; | |
254 | } | |
255 | ||
55cc08a6 DG |
256 | /* |
257 | * Delete ust context safely. RCU read lock must be held before calling | |
258 | * this function. | |
259 | */ | |
260 | static | |
261 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
262 | { | |
ffe60014 DG |
263 | int ret; |
264 | ||
265 | assert(ua_ctx); | |
266 | ||
55cc08a6 | 267 | if (ua_ctx->obj) { |
ffe60014 | 268 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
269 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
270 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
271 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 272 | } |
55cc08a6 DG |
273 | free(ua_ctx->obj); |
274 | } | |
275 | free(ua_ctx); | |
276 | } | |
277 | ||
d80a6244 DG |
278 | /* |
279 | * Delete ust app event safely. RCU read lock must be held before calling | |
280 | * this function. | |
281 | */ | |
8b366481 DG |
282 | static |
283 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 284 | { |
ffe60014 DG |
285 | int ret; |
286 | ||
287 | assert(ua_event); | |
288 | ||
53a80697 | 289 | free(ua_event->filter); |
951f0b71 JI |
290 | if (ua_event->exclusion != NULL) |
291 | free(ua_event->exclusion); | |
edb67388 | 292 | if (ua_event->obj != NULL) { |
ffe60014 DG |
293 | ret = ustctl_release_object(sock, ua_event->obj); |
294 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
295 | ERR("UST app sock %d release event obj failed with ret %d", | |
296 | sock, ret); | |
297 | } | |
edb67388 DG |
298 | free(ua_event->obj); |
299 | } | |
d80a6244 DG |
300 | free(ua_event); |
301 | } | |
302 | ||
303 | /* | |
7972aab2 DG |
304 | * Release ust data object of the given stream. |
305 | * | |
306 | * Return 0 on success or else a negative value. | |
d80a6244 | 307 | */ |
7972aab2 | 308 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 309 | { |
7972aab2 | 310 | int ret = 0; |
ffe60014 DG |
311 | |
312 | assert(stream); | |
313 | ||
8b366481 | 314 | if (stream->obj) { |
ffe60014 DG |
315 | ret = ustctl_release_object(sock, stream->obj); |
316 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
317 | ERR("UST app sock %d release stream obj failed with ret %d", | |
318 | sock, ret); | |
319 | } | |
4063050c | 320 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
321 | free(stream->obj); |
322 | } | |
7972aab2 DG |
323 | |
324 | return ret; | |
325 | } | |
326 | ||
327 | /* | |
328 | * Delete ust app stream safely. RCU read lock must be held before calling | |
329 | * this function. | |
330 | */ | |
331 | static | |
332 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
333 | { | |
334 | assert(stream); | |
335 | ||
336 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 337 | free(stream); |
d80a6244 DG |
338 | } |
339 | ||
36b588ed MD |
340 | /* |
341 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
342 | * section and outside of call_rcu thread, so we postpone its execution |
343 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
344 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
345 | */ |
346 | static | |
347 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
348 | { | |
349 | struct ust_app_channel *ua_chan = | |
350 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
351 | ||
0b2dc8df MD |
352 | ht_cleanup_push(ua_chan->ctx); |
353 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
354 | free(ua_chan); |
355 | } | |
356 | ||
d80a6244 DG |
357 | /* |
358 | * Delete ust app channel safely. RCU read lock must be held before calling | |
359 | * this function. | |
360 | */ | |
8b366481 | 361 | static |
d0b96690 DG |
362 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
363 | struct ust_app *app) | |
d80a6244 DG |
364 | { |
365 | int ret; | |
bec39940 | 366 | struct lttng_ht_iter iter; |
d80a6244 | 367 | struct ust_app_event *ua_event; |
55cc08a6 | 368 | struct ust_app_ctx *ua_ctx; |
030a66fa | 369 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 370 | struct ust_registry_session *registry; |
d80a6244 | 371 | |
ffe60014 DG |
372 | assert(ua_chan); |
373 | ||
374 | DBG3("UST app deleting channel %s", ua_chan->name); | |
375 | ||
55cc08a6 | 376 | /* Wipe stream */ |
d80a6244 | 377 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 378 | cds_list_del(&stream->list); |
d80a6244 DG |
379 | delete_ust_app_stream(sock, stream); |
380 | } | |
381 | ||
55cc08a6 | 382 | /* Wipe context */ |
bec39940 | 383 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 384 | cds_list_del(&ua_ctx->list); |
bec39940 | 385 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 DG |
386 | assert(!ret); |
387 | delete_ust_app_ctx(sock, ua_ctx); | |
388 | } | |
d80a6244 | 389 | |
55cc08a6 | 390 | /* Wipe events */ |
bec39940 DG |
391 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
392 | node.node) { | |
393 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 394 | assert(!ret); |
d80a6244 DG |
395 | delete_ust_app_event(sock, ua_event); |
396 | } | |
edb67388 | 397 | |
c8335706 MD |
398 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
399 | /* Wipe and free registry from session registry. */ | |
400 | registry = get_session_registry(ua_chan->session); | |
401 | if (registry) { | |
402 | ust_registry_channel_del_free(registry, ua_chan->key); | |
403 | } | |
7972aab2 | 404 | } |
d0b96690 | 405 | |
edb67388 | 406 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
407 | /* Remove channel from application UST object descriptor. */ |
408 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
409 | ret = lttng_ht_del(app->ust_objd, &iter); |
410 | assert(!ret); | |
ffe60014 DG |
411 | ret = ustctl_release_object(sock, ua_chan->obj); |
412 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
413 | ERR("UST app sock %d release channel obj failed with ret %d", | |
414 | sock, ret); | |
415 | } | |
7972aab2 | 416 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
417 | free(ua_chan->obj); |
418 | } | |
36b588ed | 419 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
420 | } |
421 | ||
331744e3 | 422 | /* |
1b532a60 DG |
423 | * Push metadata to consumer socket. |
424 | * | |
425 | * The socket lock MUST be acquired. | |
426 | * The ust app session lock MUST be acquired. | |
331744e3 JD |
427 | * |
428 | * On success, return the len of metadata pushed or else a negative value. | |
429 | */ | |
430 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
431 | struct consumer_socket *socket, int send_zero_data) | |
432 | { | |
433 | int ret; | |
434 | char *metadata_str = NULL; | |
435 | size_t len, offset; | |
436 | ssize_t ret_val; | |
437 | ||
438 | assert(registry); | |
439 | assert(socket); | |
1b532a60 DG |
440 | |
441 | /* | |
442 | * On a push metadata error either the consumer is dead or the metadata | |
443 | * channel has been destroyed because its endpoint might have died (e.g: | |
444 | * relayd). If so, the metadata closed flag is set to 1 so we deny pushing | |
445 | * metadata again which is not valid anymore on the consumer side. | |
446 | * | |
447 | * The ust app session mutex locked allows us to make this check without | |
448 | * the registry lock. | |
449 | */ | |
450 | if (registry->metadata_closed) { | |
451 | return -EPIPE; | |
452 | } | |
331744e3 JD |
453 | |
454 | pthread_mutex_lock(®istry->lock); | |
455 | ||
456 | offset = registry->metadata_len_sent; | |
457 | len = registry->metadata_len - registry->metadata_len_sent; | |
458 | if (len == 0) { | |
459 | DBG3("No metadata to push for metadata key %" PRIu64, | |
460 | registry->metadata_key); | |
461 | ret_val = len; | |
462 | if (send_zero_data) { | |
463 | DBG("No metadata to push"); | |
464 | goto push_data; | |
465 | } | |
466 | goto end; | |
467 | } | |
468 | ||
469 | /* Allocate only what we have to send. */ | |
470 | metadata_str = zmalloc(len); | |
471 | if (!metadata_str) { | |
472 | PERROR("zmalloc ust app metadata string"); | |
473 | ret_val = -ENOMEM; | |
474 | goto error; | |
475 | } | |
476 | /* Copy what we haven't send out. */ | |
477 | memcpy(metadata_str, registry->metadata + offset, len); | |
478 | registry->metadata_len_sent += len; | |
479 | ||
480 | push_data: | |
481 | pthread_mutex_unlock(®istry->lock); | |
482 | ret = consumer_push_metadata(socket, registry->metadata_key, | |
483 | metadata_str, len, offset); | |
484 | if (ret < 0) { | |
000baf6a DG |
485 | /* |
486 | * There is an acceptable race here between the registry metadata key | |
487 | * assignment and the creation on the consumer. The session daemon can | |
488 | * concurrently push metadata for this registry while being created on | |
489 | * the consumer since the metadata key of the registry is assigned | |
490 | * *before* it is setup to avoid the consumer to ask for metadata that | |
491 | * could possibly be not found in the session daemon. | |
492 | * | |
493 | * The metadata will get pushed either by the session being stopped or | |
494 | * the consumer requesting metadata if that race is triggered. | |
495 | */ | |
496 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
497 | ret = 0; | |
498 | } | |
ffa3f245 DG |
499 | |
500 | /* Update back the actual metadata len sent since it failed here. */ | |
501 | pthread_mutex_lock(®istry->lock); | |
502 | registry->metadata_len_sent -= len; | |
503 | pthread_mutex_unlock(®istry->lock); | |
331744e3 JD |
504 | ret_val = ret; |
505 | goto error_push; | |
506 | } | |
507 | ||
508 | free(metadata_str); | |
509 | return len; | |
510 | ||
511 | end: | |
512 | error: | |
513 | pthread_mutex_unlock(®istry->lock); | |
514 | error_push: | |
515 | free(metadata_str); | |
516 | return ret_val; | |
517 | } | |
518 | ||
d88aee68 DG |
519 | /* |
520 | * For a given application and session, push metadata to consumer. The session | |
521 | * lock MUST be acquired here before calling this. | |
331744e3 JD |
522 | * Either sock or consumer is required : if sock is NULL, the default |
523 | * socket to send the metadata is retrieved from consumer, if sock | |
524 | * is not NULL we use it to send the metadata. | |
d88aee68 DG |
525 | * |
526 | * Return 0 on success else a negative error. | |
527 | */ | |
7972aab2 DG |
528 | static int push_metadata(struct ust_registry_session *registry, |
529 | struct consumer_output *consumer) | |
d88aee68 | 530 | { |
331744e3 JD |
531 | int ret_val; |
532 | ssize_t ret; | |
d88aee68 DG |
533 | struct consumer_socket *socket; |
534 | ||
7972aab2 DG |
535 | assert(registry); |
536 | assert(consumer); | |
537 | ||
538 | rcu_read_lock(); | |
d88aee68 | 539 | |
7972aab2 DG |
540 | /* |
541 | * Means that no metadata was assigned to the session. This can happens if | |
542 | * no start has been done previously. | |
543 | */ | |
544 | if (!registry->metadata_key) { | |
331744e3 | 545 | ret_val = 0; |
1b532a60 | 546 | goto end_rcu_unlock; |
d88aee68 DG |
547 | } |
548 | ||
d88aee68 | 549 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
550 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
551 | consumer); | |
d88aee68 | 552 | if (!socket) { |
331744e3 | 553 | ret_val = -1; |
d88aee68 DG |
554 | goto error_rcu_unlock; |
555 | } | |
556 | ||
557 | /* | |
558 | * TODO: Currently, we hold the socket lock around sampling of the next | |
559 | * metadata segment to ensure we send metadata over the consumer socket in | |
560 | * the correct order. This makes the registry lock nest inside the socket | |
561 | * lock. | |
562 | * | |
563 | * Please note that this is a temporary measure: we should move this lock | |
564 | * back into ust_consumer_push_metadata() when the consumer gets the | |
565 | * ability to reorder the metadata it receives. | |
566 | */ | |
567 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
568 | ret = ust_app_push_metadata(registry, socket, 0); |
569 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 570 | if (ret < 0) { |
331744e3 | 571 | ret_val = ret; |
d88aee68 DG |
572 | goto error_rcu_unlock; |
573 | } | |
574 | ||
d88aee68 | 575 | rcu_read_unlock(); |
d88aee68 DG |
576 | return 0; |
577 | ||
d88aee68 | 578 | error_rcu_unlock: |
1b532a60 DG |
579 | /* |
580 | * On error, flag the registry that the metadata is closed. We were unable | |
581 | * to push anything and this means that either the consumer is not | |
582 | * responding or the metadata cache has been destroyed on the consumer. | |
583 | */ | |
584 | registry->metadata_closed = 1; | |
585 | end_rcu_unlock: | |
d88aee68 | 586 | rcu_read_unlock(); |
331744e3 | 587 | return ret_val; |
d88aee68 DG |
588 | } |
589 | ||
590 | /* | |
591 | * Send to the consumer a close metadata command for the given session. Once | |
592 | * done, the metadata channel is deleted and the session metadata pointer is | |
593 | * nullified. The session lock MUST be acquired here unless the application is | |
594 | * in the destroy path. | |
595 | * | |
596 | * Return 0 on success else a negative value. | |
597 | */ | |
7972aab2 DG |
598 | static int close_metadata(struct ust_registry_session *registry, |
599 | struct consumer_output *consumer) | |
d88aee68 DG |
600 | { |
601 | int ret; | |
602 | struct consumer_socket *socket; | |
603 | ||
7972aab2 DG |
604 | assert(registry); |
605 | assert(consumer); | |
d88aee68 | 606 | |
7972aab2 DG |
607 | rcu_read_lock(); |
608 | ||
609 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 | 610 | ret = 0; |
1b532a60 | 611 | goto end; |
d88aee68 DG |
612 | } |
613 | ||
d88aee68 | 614 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
615 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
616 | consumer); | |
d88aee68 DG |
617 | if (!socket) { |
618 | ret = -1; | |
7972aab2 | 619 | goto error; |
d88aee68 DG |
620 | } |
621 | ||
7972aab2 | 622 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 623 | if (ret < 0) { |
7972aab2 | 624 | goto error; |
d88aee68 DG |
625 | } |
626 | ||
d88aee68 | 627 | error: |
1b532a60 DG |
628 | /* |
629 | * Metadata closed. Even on error this means that the consumer is not | |
630 | * responding or not found so either way a second close should NOT be emit | |
631 | * for this registry. | |
632 | */ | |
633 | registry->metadata_closed = 1; | |
634 | end: | |
7972aab2 | 635 | rcu_read_unlock(); |
d88aee68 DG |
636 | return ret; |
637 | } | |
638 | ||
36b588ed MD |
639 | /* |
640 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
641 | * section and outside of call_rcu thread, so we postpone its execution |
642 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
643 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
644 | */ |
645 | static | |
646 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
647 | { | |
648 | struct ust_app_session *ua_sess = | |
649 | caa_container_of(head, struct ust_app_session, rcu_head); | |
650 | ||
0b2dc8df | 651 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
652 | free(ua_sess); |
653 | } | |
654 | ||
d80a6244 DG |
655 | /* |
656 | * Delete ust app session safely. RCU read lock must be held before calling | |
657 | * this function. | |
658 | */ | |
8b366481 | 659 | static |
d0b96690 DG |
660 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
661 | struct ust_app *app) | |
d80a6244 DG |
662 | { |
663 | int ret; | |
bec39940 | 664 | struct lttng_ht_iter iter; |
d80a6244 | 665 | struct ust_app_channel *ua_chan; |
7972aab2 | 666 | struct ust_registry_session *registry; |
d80a6244 | 667 | |
d88aee68 DG |
668 | assert(ua_sess); |
669 | ||
1b532a60 DG |
670 | pthread_mutex_lock(&ua_sess->lock); |
671 | ||
7972aab2 | 672 | registry = get_session_registry(ua_sess); |
1b532a60 | 673 | if (registry && !registry->metadata_closed) { |
d88aee68 | 674 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 675 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 676 | |
7972aab2 DG |
677 | /* |
678 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
679 | * metadata only on destroy trace session in this case. Also, the |
680 | * previous push metadata could have flag the metadata registry to | |
681 | * close so don't send a close command if closed. | |
7972aab2 | 682 | */ |
1b532a60 DG |
683 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
684 | !registry->metadata_closed) { | |
7972aab2 DG |
685 | /* And ask to close it for this session registry. */ |
686 | (void) close_metadata(registry, ua_sess->consumer); | |
687 | } | |
d80a6244 DG |
688 | } |
689 | ||
bec39940 DG |
690 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
691 | node.node) { | |
692 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 693 | assert(!ret); |
d0b96690 | 694 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 695 | } |
d80a6244 | 696 | |
7972aab2 DG |
697 | /* In case of per PID, the registry is kept in the session. */ |
698 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
699 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
700 | if (reg_pid) { | |
701 | buffer_reg_pid_remove(reg_pid); | |
702 | buffer_reg_pid_destroy(reg_pid); | |
703 | } | |
704 | } | |
d0b96690 | 705 | |
aee6bafd | 706 | if (ua_sess->handle != -1) { |
ffe60014 DG |
707 | ret = ustctl_release_handle(sock, ua_sess->handle); |
708 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
709 | ERR("UST app sock %d release session handle failed with ret %d", | |
710 | sock, ret); | |
711 | } | |
aee6bafd | 712 | } |
1b532a60 DG |
713 | pthread_mutex_unlock(&ua_sess->lock); |
714 | ||
36b588ed | 715 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 716 | } |
91d76f53 DG |
717 | |
718 | /* | |
284d8f55 DG |
719 | * Delete a traceable application structure from the global list. Never call |
720 | * this function outside of a call_rcu call. | |
36b588ed MD |
721 | * |
722 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 723 | */ |
8b366481 DG |
724 | static |
725 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 726 | { |
8b366481 | 727 | int ret, sock; |
d42f20df | 728 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 729 | |
d80a6244 | 730 | /* Delete ust app sessions info */ |
852d0037 DG |
731 | sock = app->sock; |
732 | app->sock = -1; | |
d80a6244 | 733 | |
8b366481 | 734 | /* Wipe sessions */ |
d42f20df DG |
735 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
736 | teardown_node) { | |
737 | /* Free every object in the session and the session. */ | |
36b588ed | 738 | rcu_read_lock(); |
d0b96690 | 739 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 740 | rcu_read_unlock(); |
d80a6244 | 741 | } |
36b588ed | 742 | |
0b2dc8df MD |
743 | ht_cleanup_push(app->sessions); |
744 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 745 | |
6414a713 | 746 | /* |
852d0037 DG |
747 | * Wait until we have deleted the application from the sock hash table |
748 | * before closing this socket, otherwise an application could re-use the | |
749 | * socket ID and race with the teardown, using the same hash table entry. | |
750 | * | |
751 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
752 | * all RCU readers that could run concurrently with unregister app, | |
753 | * therefore we _need_ to only close that socket after a grace period. So | |
754 | * it should stay in this RCU callback. | |
755 | * | |
756 | * This close() is a very important step of the synchronization model so | |
757 | * every modification to this function must be carefully reviewed. | |
6414a713 | 758 | */ |
799e2c4f MD |
759 | ret = close(sock); |
760 | if (ret) { | |
761 | PERROR("close"); | |
762 | } | |
4063050c | 763 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 764 | |
852d0037 | 765 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 766 | free(app); |
099e26bd DG |
767 | } |
768 | ||
769 | /* | |
f6a9efaa | 770 | * URCU intermediate call to delete an UST app. |
099e26bd | 771 | */ |
8b366481 DG |
772 | static |
773 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 774 | { |
bec39940 DG |
775 | struct lttng_ht_node_ulong *node = |
776 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 777 | struct ust_app *app = |
852d0037 | 778 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 779 | |
852d0037 | 780 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 781 | delete_ust_app(app); |
099e26bd DG |
782 | } |
783 | ||
ffe60014 DG |
784 | /* |
785 | * Delete the session from the application ht and delete the data structure by | |
786 | * freeing every object inside and releasing them. | |
787 | */ | |
d0b96690 | 788 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
789 | struct ust_app_session *ua_sess) |
790 | { | |
791 | int ret; | |
792 | struct lttng_ht_iter iter; | |
793 | ||
794 | assert(app); | |
795 | assert(ua_sess); | |
796 | ||
797 | iter.iter.node = &ua_sess->node.node; | |
798 | ret = lttng_ht_del(app->sessions, &iter); | |
799 | if (ret) { | |
800 | /* Already scheduled for teardown. */ | |
801 | goto end; | |
802 | } | |
803 | ||
804 | /* Once deleted, free the data structure. */ | |
d0b96690 | 805 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
806 | |
807 | end: | |
808 | return; | |
809 | } | |
810 | ||
8b366481 DG |
811 | /* |
812 | * Alloc new UST app session. | |
813 | */ | |
814 | static | |
d0b96690 | 815 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
816 | { |
817 | struct ust_app_session *ua_sess; | |
818 | ||
819 | /* Init most of the default value by allocating and zeroing */ | |
820 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
821 | if (ua_sess == NULL) { | |
822 | PERROR("malloc"); | |
ffe60014 | 823 | goto error_free; |
8b366481 DG |
824 | } |
825 | ||
826 | ua_sess->handle = -1; | |
bec39940 | 827 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
d0b96690 | 828 | pthread_mutex_init(&ua_sess->lock, NULL); |
ffe60014 | 829 | |
ad7a9107 DG |
830 | /* Set default metadata channel attribute. */ |
831 | ua_sess->metadata_attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
832 | ua_sess->metadata_attr.subbuf_size = default_get_metadata_subbuf_size(); | |
833 | ua_sess->metadata_attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
834 | ua_sess->metadata_attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER; | |
835 | ua_sess->metadata_attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER; | |
836 | ua_sess->metadata_attr.output = LTTNG_UST_MMAP; | |
837 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; | |
838 | ||
8b366481 DG |
839 | return ua_sess; |
840 | ||
ffe60014 | 841 | error_free: |
8b366481 DG |
842 | return NULL; |
843 | } | |
844 | ||
845 | /* | |
846 | * Alloc new UST app channel. | |
847 | */ | |
848 | static | |
849 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 850 | struct ust_app_session *ua_sess, |
ffe60014 | 851 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
852 | { |
853 | struct ust_app_channel *ua_chan; | |
854 | ||
855 | /* Init most of the default value by allocating and zeroing */ | |
856 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
857 | if (ua_chan == NULL) { | |
858 | PERROR("malloc"); | |
859 | goto error; | |
860 | } | |
861 | ||
862 | /* Setup channel name */ | |
863 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
864 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
865 | ||
866 | ua_chan->enabled = 1; | |
867 | ua_chan->handle = -1; | |
45893984 | 868 | ua_chan->session = ua_sess; |
ffe60014 | 869 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
870 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
871 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
872 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
873 | |
874 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 875 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
876 | |
877 | /* Copy attributes */ | |
878 | if (attr) { | |
ffe60014 | 879 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
880 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
881 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
882 | ua_chan->attr.overwrite = attr->overwrite; | |
883 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
884 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
885 | ua_chan->attr.output = attr->output; | |
8b366481 | 886 | } |
ffe60014 DG |
887 | /* By default, the channel is a per cpu channel. */ |
888 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
889 | |
890 | DBG3("UST app channel %s allocated", ua_chan->name); | |
891 | ||
892 | return ua_chan; | |
893 | ||
894 | error: | |
895 | return NULL; | |
896 | } | |
897 | ||
37f1c236 DG |
898 | /* |
899 | * Allocate and initialize a UST app stream. | |
900 | * | |
901 | * Return newly allocated stream pointer or NULL on error. | |
902 | */ | |
ffe60014 | 903 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
904 | { |
905 | struct ust_app_stream *stream = NULL; | |
906 | ||
907 | stream = zmalloc(sizeof(*stream)); | |
908 | if (stream == NULL) { | |
909 | PERROR("zmalloc ust app stream"); | |
910 | goto error; | |
911 | } | |
912 | ||
913 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
914 | stream->handle = -1; | |
915 | ||
916 | error: | |
917 | return stream; | |
918 | } | |
919 | ||
8b366481 DG |
920 | /* |
921 | * Alloc new UST app event. | |
922 | */ | |
923 | static | |
924 | struct ust_app_event *alloc_ust_app_event(char *name, | |
925 | struct lttng_ust_event *attr) | |
926 | { | |
927 | struct ust_app_event *ua_event; | |
928 | ||
929 | /* Init most of the default value by allocating and zeroing */ | |
930 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
931 | if (ua_event == NULL) { | |
932 | PERROR("malloc"); | |
933 | goto error; | |
934 | } | |
935 | ||
936 | ua_event->enabled = 1; | |
937 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
938 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 939 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
940 | |
941 | /* Copy attributes */ | |
942 | if (attr) { | |
943 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
944 | } | |
945 | ||
946 | DBG3("UST app event %s allocated", ua_event->name); | |
947 | ||
948 | return ua_event; | |
949 | ||
950 | error: | |
951 | return NULL; | |
952 | } | |
953 | ||
954 | /* | |
955 | * Alloc new UST app context. | |
956 | */ | |
957 | static | |
958 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
959 | { | |
960 | struct ust_app_ctx *ua_ctx; | |
961 | ||
962 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
963 | if (ua_ctx == NULL) { | |
964 | goto error; | |
965 | } | |
966 | ||
31746f93 DG |
967 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
968 | ||
8b366481 DG |
969 | if (uctx) { |
970 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
971 | } | |
972 | ||
973 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
974 | ||
975 | error: | |
976 | return ua_ctx; | |
977 | } | |
978 | ||
025faf73 DG |
979 | /* |
980 | * Allocate a filter and copy the given original filter. | |
981 | * | |
982 | * Return allocated filter or NULL on error. | |
983 | */ | |
984 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
985 | struct lttng_ust_filter_bytecode *orig_f) | |
986 | { | |
987 | struct lttng_ust_filter_bytecode *filter = NULL; | |
988 | ||
989 | /* Copy filter bytecode */ | |
990 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
991 | if (!filter) { | |
992 | PERROR("zmalloc alloc ust app filter"); | |
993 | goto error; | |
994 | } | |
995 | ||
996 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
997 | ||
998 | error: | |
999 | return filter; | |
1000 | } | |
1001 | ||
099e26bd | 1002 | /* |
421cb601 DG |
1003 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1004 | * held before calling this helper function. | |
099e26bd | 1005 | */ |
f20baf8e | 1006 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1007 | { |
bec39940 | 1008 | struct lttng_ht_node_ulong *node; |
bec39940 | 1009 | struct lttng_ht_iter iter; |
f6a9efaa | 1010 | |
852d0037 | 1011 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1012 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1013 | if (node == NULL) { |
1014 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1015 | goto error; |
1016 | } | |
852d0037 DG |
1017 | |
1018 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1019 | |
1020 | error: | |
1021 | return NULL; | |
099e26bd DG |
1022 | } |
1023 | ||
d0b96690 DG |
1024 | /* |
1025 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1026 | * be held before calling this helper function. | |
1027 | */ | |
1028 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1029 | { | |
1030 | struct lttng_ht_node_ulong *node; | |
1031 | struct lttng_ht_iter iter; | |
1032 | ||
1033 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1034 | &iter); | |
1035 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1036 | if (node == NULL) { | |
1037 | DBG2("UST app find by notify sock %d not found", sock); | |
1038 | goto error; | |
1039 | } | |
1040 | ||
1041 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1042 | ||
1043 | error: | |
1044 | return NULL; | |
1045 | } | |
1046 | ||
025faf73 DG |
1047 | /* |
1048 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1049 | * event loglevel. | |
1050 | * | |
1051 | * Return an ust_app_event object or NULL on error. | |
1052 | */ | |
18eace3b | 1053 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
39c5a3a7 JI |
1054 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel, |
1055 | const struct lttng_event_exclusion *exclusion) | |
18eace3b DG |
1056 | { |
1057 | struct lttng_ht_iter iter; | |
1058 | struct lttng_ht_node_str *node; | |
1059 | struct ust_app_event *event = NULL; | |
1060 | struct ust_app_ht_key key; | |
18eace3b DG |
1061 | |
1062 | assert(name); | |
1063 | assert(ht); | |
1064 | ||
1065 | /* Setup key for event lookup. */ | |
1066 | key.name = name; | |
1067 | key.filter = filter; | |
1068 | key.loglevel = loglevel; | |
39c5a3a7 JI |
1069 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
1070 | key.exclusion = (struct lttng_ust_event_exclusion *)exclusion; | |
18eace3b | 1071 | |
025faf73 DG |
1072 | /* Lookup using the event name as hash and a custom match fct. */ |
1073 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1074 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1075 | node = lttng_ht_iter_get_node_str(&iter); |
1076 | if (node == NULL) { | |
1077 | goto end; | |
1078 | } | |
1079 | ||
1080 | event = caa_container_of(node, struct ust_app_event, node); | |
1081 | ||
1082 | end: | |
18eace3b DG |
1083 | return event; |
1084 | } | |
1085 | ||
55cc08a6 DG |
1086 | /* |
1087 | * Create the channel context on the tracer. | |
d0b96690 DG |
1088 | * |
1089 | * Called with UST app session lock held. | |
55cc08a6 DG |
1090 | */ |
1091 | static | |
1092 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1093 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1094 | { | |
1095 | int ret; | |
1096 | ||
840cb59c | 1097 | health_code_update(); |
86acf0da | 1098 | |
852d0037 | 1099 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1100 | ua_chan->obj, &ua_ctx->obj); |
1101 | if (ret < 0) { | |
ffe60014 DG |
1102 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1103 | ERR("UST app create channel context failed for app (pid: %d) " | |
1104 | "with ret %d", app->pid, ret); | |
1105 | } else { | |
3757b385 DG |
1106 | /* |
1107 | * This is normal behavior, an application can die during the | |
1108 | * creation process. Don't report an error so the execution can | |
1109 | * continue normally. | |
1110 | */ | |
1111 | ret = 0; | |
ffe60014 DG |
1112 | DBG3("UST app disable event failed. Application is dead."); |
1113 | } | |
55cc08a6 DG |
1114 | goto error; |
1115 | } | |
1116 | ||
1117 | ua_ctx->handle = ua_ctx->obj->handle; | |
1118 | ||
d0b96690 DG |
1119 | DBG2("UST app context handle %d created successfully for channel %s", |
1120 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1121 | |
1122 | error: | |
840cb59c | 1123 | health_code_update(); |
55cc08a6 DG |
1124 | return ret; |
1125 | } | |
1126 | ||
53a80697 MD |
1127 | /* |
1128 | * Set the filter on the tracer. | |
1129 | */ | |
1130 | static | |
1131 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1132 | struct ust_app *app) | |
1133 | { | |
1134 | int ret; | |
1135 | ||
840cb59c | 1136 | health_code_update(); |
86acf0da | 1137 | |
53a80697 | 1138 | if (!ua_event->filter) { |
86acf0da DG |
1139 | ret = 0; |
1140 | goto error; | |
53a80697 MD |
1141 | } |
1142 | ||
1143 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1144 | ua_event->obj); | |
1145 | if (ret < 0) { | |
ffe60014 DG |
1146 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1147 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1148 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1149 | } else { | |
3757b385 DG |
1150 | /* |
1151 | * This is normal behavior, an application can die during the | |
1152 | * creation process. Don't report an error so the execution can | |
1153 | * continue normally. | |
1154 | */ | |
1155 | ret = 0; | |
ffe60014 DG |
1156 | DBG3("UST app filter event failed. Application is dead."); |
1157 | } | |
53a80697 MD |
1158 | goto error; |
1159 | } | |
1160 | ||
1161 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1162 | ||
1163 | error: | |
840cb59c | 1164 | health_code_update(); |
53a80697 MD |
1165 | return ret; |
1166 | } | |
1167 | ||
7cc9a73c JI |
1168 | /* |
1169 | * Set event exclusions on the tracer. | |
1170 | */ | |
1171 | static | |
1172 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1173 | struct ust_app *app) | |
1174 | { | |
1175 | int ret; | |
1176 | ||
1177 | health_code_update(); | |
1178 | ||
1179 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1180 | ret = 0; | |
1181 | goto error; | |
1182 | } | |
1183 | ||
1184 | ret = ustctl_set_exclusion(app->sock, ua_event->exclusion, | |
1185 | ua_event->obj); | |
1186 | if (ret < 0) { | |
1187 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1188 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1189 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1190 | } else { | |
1191 | /* | |
1192 | * This is normal behavior, an application can die during the | |
1193 | * creation process. Don't report an error so the execution can | |
1194 | * continue normally. | |
1195 | */ | |
1196 | ret = 0; | |
1197 | DBG3("UST app event exclusion failed. Application is dead."); | |
1198 | } | |
1199 | goto error; | |
1200 | } | |
1201 | ||
1202 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1203 | ||
1204 | error: | |
1205 | health_code_update(); | |
1206 | return ret; | |
1207 | } | |
1208 | ||
9730260e DG |
1209 | /* |
1210 | * Disable the specified event on to UST tracer for the UST session. | |
1211 | */ | |
1212 | static int disable_ust_event(struct ust_app *app, | |
1213 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1214 | { | |
1215 | int ret; | |
1216 | ||
840cb59c | 1217 | health_code_update(); |
86acf0da | 1218 | |
852d0037 | 1219 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1220 | if (ret < 0) { |
ffe60014 DG |
1221 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1222 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1223 | "and session handle %d with ret %d", | |
1224 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1225 | } else { | |
3757b385 DG |
1226 | /* |
1227 | * This is normal behavior, an application can die during the | |
1228 | * creation process. Don't report an error so the execution can | |
1229 | * continue normally. | |
1230 | */ | |
1231 | ret = 0; | |
ffe60014 DG |
1232 | DBG3("UST app disable event failed. Application is dead."); |
1233 | } | |
9730260e DG |
1234 | goto error; |
1235 | } | |
1236 | ||
1237 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1238 | ua_event->attr.name, app->pid); |
9730260e DG |
1239 | |
1240 | error: | |
840cb59c | 1241 | health_code_update(); |
9730260e DG |
1242 | return ret; |
1243 | } | |
1244 | ||
78f0bacd DG |
1245 | /* |
1246 | * Disable the specified channel on to UST tracer for the UST session. | |
1247 | */ | |
1248 | static int disable_ust_channel(struct ust_app *app, | |
1249 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1250 | { | |
1251 | int ret; | |
1252 | ||
840cb59c | 1253 | health_code_update(); |
86acf0da | 1254 | |
852d0037 | 1255 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1256 | if (ret < 0) { |
ffe60014 DG |
1257 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1258 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1259 | "and session handle %d with ret %d", | |
1260 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1261 | } else { | |
3757b385 DG |
1262 | /* |
1263 | * This is normal behavior, an application can die during the | |
1264 | * creation process. Don't report an error so the execution can | |
1265 | * continue normally. | |
1266 | */ | |
1267 | ret = 0; | |
ffe60014 DG |
1268 | DBG3("UST app disable channel failed. Application is dead."); |
1269 | } | |
78f0bacd DG |
1270 | goto error; |
1271 | } | |
1272 | ||
78f0bacd | 1273 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1274 | ua_chan->name, app->pid); |
78f0bacd DG |
1275 | |
1276 | error: | |
840cb59c | 1277 | health_code_update(); |
78f0bacd DG |
1278 | return ret; |
1279 | } | |
1280 | ||
1281 | /* | |
1282 | * Enable the specified channel on to UST tracer for the UST session. | |
1283 | */ | |
1284 | static int enable_ust_channel(struct ust_app *app, | |
1285 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1286 | { | |
1287 | int ret; | |
1288 | ||
840cb59c | 1289 | health_code_update(); |
86acf0da | 1290 | |
852d0037 | 1291 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1292 | if (ret < 0) { |
ffe60014 DG |
1293 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1294 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1295 | "and session handle %d with ret %d", | |
1296 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1297 | } else { | |
3757b385 DG |
1298 | /* |
1299 | * This is normal behavior, an application can die during the | |
1300 | * creation process. Don't report an error so the execution can | |
1301 | * continue normally. | |
1302 | */ | |
1303 | ret = 0; | |
ffe60014 DG |
1304 | DBG3("UST app enable channel failed. Application is dead."); |
1305 | } | |
78f0bacd DG |
1306 | goto error; |
1307 | } | |
1308 | ||
1309 | ua_chan->enabled = 1; | |
1310 | ||
1311 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1312 | ua_chan->name, app->pid); |
78f0bacd DG |
1313 | |
1314 | error: | |
840cb59c | 1315 | health_code_update(); |
78f0bacd DG |
1316 | return ret; |
1317 | } | |
1318 | ||
edb67388 DG |
1319 | /* |
1320 | * Enable the specified event on to UST tracer for the UST session. | |
1321 | */ | |
1322 | static int enable_ust_event(struct ust_app *app, | |
1323 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1324 | { | |
1325 | int ret; | |
1326 | ||
840cb59c | 1327 | health_code_update(); |
86acf0da | 1328 | |
852d0037 | 1329 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1330 | if (ret < 0) { |
ffe60014 DG |
1331 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1332 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1333 | "and session handle %d with ret %d", | |
1334 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1335 | } else { | |
3757b385 DG |
1336 | /* |
1337 | * This is normal behavior, an application can die during the | |
1338 | * creation process. Don't report an error so the execution can | |
1339 | * continue normally. | |
1340 | */ | |
1341 | ret = 0; | |
ffe60014 DG |
1342 | DBG3("UST app enable event failed. Application is dead."); |
1343 | } | |
edb67388 DG |
1344 | goto error; |
1345 | } | |
1346 | ||
1347 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1348 | ua_event->attr.name, app->pid); |
edb67388 DG |
1349 | |
1350 | error: | |
840cb59c | 1351 | health_code_update(); |
edb67388 DG |
1352 | return ret; |
1353 | } | |
1354 | ||
099e26bd | 1355 | /* |
7972aab2 | 1356 | * Send channel and stream buffer to application. |
4f3ab6ee | 1357 | * |
ffe60014 | 1358 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1359 | */ |
7972aab2 DG |
1360 | static int send_channel_pid_to_ust(struct ust_app *app, |
1361 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1362 | { |
1363 | int ret; | |
ffe60014 | 1364 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1365 | |
1366 | assert(app); | |
ffe60014 | 1367 | assert(ua_sess); |
4f3ab6ee | 1368 | assert(ua_chan); |
4f3ab6ee | 1369 | |
840cb59c | 1370 | health_code_update(); |
4f3ab6ee | 1371 | |
7972aab2 DG |
1372 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1373 | app->sock); | |
86acf0da | 1374 | |
ffe60014 DG |
1375 | /* Send channel to the application. */ |
1376 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1377 | if (ret < 0) { |
b551a063 DG |
1378 | goto error; |
1379 | } | |
1380 | ||
d88aee68 DG |
1381 | health_code_update(); |
1382 | ||
ffe60014 DG |
1383 | /* Send all streams to application. */ |
1384 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1385 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1386 | if (ret < 0) { | |
1387 | goto error; | |
1388 | } | |
1389 | /* We don't need the stream anymore once sent to the tracer. */ | |
1390 | cds_list_del(&stream->list); | |
1391 | delete_ust_app_stream(-1, stream); | |
1392 | } | |
ffe60014 DG |
1393 | /* Flag the channel that it is sent to the application. */ |
1394 | ua_chan->is_sent = 1; | |
ffe60014 | 1395 | |
b551a063 | 1396 | error: |
840cb59c | 1397 | health_code_update(); |
b551a063 DG |
1398 | return ret; |
1399 | } | |
1400 | ||
91d76f53 | 1401 | /* |
5b4a0ec0 | 1402 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1403 | * |
1404 | * Should be called with session mutex held. | |
91d76f53 | 1405 | */ |
edb67388 DG |
1406 | static |
1407 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1408 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1409 | { |
5b4a0ec0 | 1410 | int ret = 0; |
284d8f55 | 1411 | |
840cb59c | 1412 | health_code_update(); |
86acf0da | 1413 | |
5b4a0ec0 | 1414 | /* Create UST event on tracer */ |
852d0037 | 1415 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1416 | &ua_event->obj); |
1417 | if (ret < 0) { | |
ffe60014 DG |
1418 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1419 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1420 | ua_event->attr.name, app->pid, ret); | |
1421 | } else { | |
3757b385 DG |
1422 | /* |
1423 | * This is normal behavior, an application can die during the | |
1424 | * creation process. Don't report an error so the execution can | |
1425 | * continue normally. | |
1426 | */ | |
1427 | ret = 0; | |
ffe60014 DG |
1428 | DBG3("UST app create event failed. Application is dead."); |
1429 | } | |
5b4a0ec0 | 1430 | goto error; |
91d76f53 | 1431 | } |
f6a9efaa | 1432 | |
5b4a0ec0 | 1433 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1434 | |
5b4a0ec0 | 1435 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1436 | ua_event->attr.name, app->pid); |
f6a9efaa | 1437 | |
840cb59c | 1438 | health_code_update(); |
86acf0da | 1439 | |
025faf73 DG |
1440 | /* Set filter if one is present. */ |
1441 | if (ua_event->filter) { | |
1442 | ret = set_ust_event_filter(ua_event, app); | |
1443 | if (ret < 0) { | |
1444 | goto error; | |
1445 | } | |
1446 | } | |
1447 | ||
7cc9a73c JI |
1448 | /* Set exclusions for the event */ |
1449 | if (ua_event->exclusion) { | |
1450 | ret = set_ust_event_exclusion(ua_event, app); | |
1451 | if (ret < 0) { | |
1452 | goto error; | |
1453 | } | |
1454 | } | |
1455 | ||
8535a6d9 | 1456 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 1457 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
1458 | ret = disable_ust_event(app, ua_sess, ua_event); |
1459 | if (ret < 0) { | |
fc34caaa DG |
1460 | /* |
1461 | * If we hit an EPERM, something is wrong with our disable call. If | |
1462 | * we get an EEXIST, there is a problem on the tracer side since we | |
1463 | * just created it. | |
1464 | */ | |
1465 | switch (ret) { | |
49c336c1 | 1466 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1467 | /* Code flow problem */ |
1468 | assert(0); | |
49c336c1 | 1469 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1470 | /* It's OK for our use case. */ |
1471 | ret = 0; | |
1472 | break; | |
1473 | default: | |
1474 | break; | |
1475 | } | |
8535a6d9 DG |
1476 | goto error; |
1477 | } | |
1478 | } | |
1479 | ||
5b4a0ec0 | 1480 | error: |
840cb59c | 1481 | health_code_update(); |
5b4a0ec0 | 1482 | return ret; |
91d76f53 | 1483 | } |
48842b30 | 1484 | |
5b4a0ec0 DG |
1485 | /* |
1486 | * Copy data between an UST app event and a LTT event. | |
1487 | */ | |
421cb601 | 1488 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1489 | struct ltt_ust_event *uevent) |
1490 | { | |
b4ffad32 JI |
1491 | size_t exclusion_alloc_size; |
1492 | ||
48842b30 DG |
1493 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1494 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1495 | ||
fc34caaa DG |
1496 | ua_event->enabled = uevent->enabled; |
1497 | ||
5b4a0ec0 DG |
1498 | /* Copy event attributes */ |
1499 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1500 | ||
53a80697 MD |
1501 | /* Copy filter bytecode */ |
1502 | if (uevent->filter) { | |
025faf73 DG |
1503 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1504 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1505 | } |
b4ffad32 JI |
1506 | |
1507 | /* Copy exclusion data */ | |
1508 | if (uevent->exclusion) { | |
1509 | exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1510 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; | |
1511 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1512 | if (ua_event->exclusion == NULL) { |
1513 | PERROR("malloc"); | |
1514 | } else { | |
1515 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1516 | exclusion_alloc_size); | |
b4ffad32 JI |
1517 | } |
1518 | } | |
48842b30 DG |
1519 | } |
1520 | ||
5b4a0ec0 DG |
1521 | /* |
1522 | * Copy data between an UST app channel and a LTT channel. | |
1523 | */ | |
421cb601 | 1524 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1525 | struct ltt_ust_channel *uchan) |
1526 | { | |
bec39940 | 1527 | struct lttng_ht_iter iter; |
48842b30 | 1528 | struct ltt_ust_event *uevent; |
55cc08a6 | 1529 | struct ltt_ust_context *uctx; |
48842b30 | 1530 | struct ust_app_event *ua_event; |
55cc08a6 | 1531 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1532 | |
fc34caaa | 1533 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1534 | |
1535 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1536 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1537 | |
1624d5b7 JD |
1538 | ua_chan->tracefile_size = uchan->tracefile_size; |
1539 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1540 | ||
ffe60014 DG |
1541 | /* Copy event attributes since the layout is different. */ |
1542 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1543 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1544 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1545 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1546 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1547 | ua_chan->attr.output = uchan->attr.output; | |
1548 | /* | |
1549 | * Note that the attribute channel type is not set since the channel on the | |
1550 | * tracing registry side does not have this information. | |
1551 | */ | |
48842b30 | 1552 | |
fc34caaa | 1553 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1554 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1555 | |
31746f93 | 1556 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1557 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1558 | if (ua_ctx == NULL) { | |
1559 | continue; | |
1560 | } | |
bec39940 DG |
1561 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1562 | (unsigned long) ua_ctx->ctx.ctx); | |
1563 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
31746f93 | 1564 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1565 | } |
48842b30 | 1566 | |
421cb601 | 1567 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1568 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1569 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1570 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1571 | if (ua_event == NULL) { |
421cb601 | 1572 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1573 | uevent->attr.name); |
284d8f55 | 1574 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1575 | if (ua_event == NULL) { |
5b4a0ec0 | 1576 | continue; |
48842b30 | 1577 | } |
421cb601 | 1578 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1579 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1580 | } |
48842b30 DG |
1581 | } |
1582 | ||
fc34caaa | 1583 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1584 | } |
1585 | ||
5b4a0ec0 DG |
1586 | /* |
1587 | * Copy data between a UST app session and a regular LTT session. | |
1588 | */ | |
421cb601 | 1589 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1590 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1591 | { |
bec39940 DG |
1592 | struct lttng_ht_node_str *ua_chan_node; |
1593 | struct lttng_ht_iter iter; | |
48842b30 DG |
1594 | struct ltt_ust_channel *uchan; |
1595 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1596 | time_t rawtime; |
1597 | struct tm *timeinfo; | |
1598 | char datetime[16]; | |
1599 | int ret; | |
1600 | ||
1601 | /* Get date and time for unique app path */ | |
1602 | time(&rawtime); | |
1603 | timeinfo = localtime(&rawtime); | |
1604 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1605 | |
421cb601 | 1606 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1607 | |
7972aab2 DG |
1608 | ua_sess->tracing_id = usess->id; |
1609 | ua_sess->id = get_next_session_id(); | |
1610 | ua_sess->uid = app->uid; | |
1611 | ua_sess->gid = app->gid; | |
1612 | ua_sess->euid = usess->uid; | |
1613 | ua_sess->egid = usess->gid; | |
1614 | ua_sess->buffer_type = usess->buffer_type; | |
1615 | ua_sess->bits_per_long = app->bits_per_long; | |
1616 | /* There is only one consumer object per session possible. */ | |
1617 | ua_sess->consumer = usess->consumer; | |
2bba9e53 | 1618 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1619 | ua_sess->live_timer_interval = usess->live_timer_interval; |
7972aab2 DG |
1620 | |
1621 | switch (ua_sess->buffer_type) { | |
1622 | case LTTNG_BUFFER_PER_PID: | |
1623 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1624 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1625 | datetime); |
1626 | break; | |
1627 | case LTTNG_BUFFER_PER_UID: | |
1628 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1629 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1630 | break; | |
1631 | default: | |
1632 | assert(0); | |
1633 | goto error; | |
1634 | } | |
477d7741 MD |
1635 | if (ret < 0) { |
1636 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1637 | assert(0); |
7972aab2 | 1638 | goto error; |
477d7741 MD |
1639 | } |
1640 | ||
48842b30 | 1641 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1642 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1643 | uchan, node.node) { | |
1644 | struct lttng_ht_iter uiter; | |
ba767faf | 1645 | |
bec39940 DG |
1646 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1647 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1648 | if (ua_chan_node != NULL) { |
fc34caaa | 1649 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1650 | continue; |
1651 | } | |
421cb601 | 1652 | |
5b4a0ec0 DG |
1653 | DBG2("Channel %s not found on shadow session copy, creating it", |
1654 | uchan->name); | |
d0b96690 | 1655 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1656 | if (ua_chan == NULL) { |
fc34caaa | 1657 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1658 | continue; |
48842b30 | 1659 | } |
5b4a0ec0 | 1660 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1661 | /* |
1662 | * The concept of metadata channel does not exist on the tracing | |
1663 | * registry side of the session daemon so this can only be a per CPU | |
1664 | * channel and not metadata. | |
1665 | */ | |
1666 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1667 | ||
bec39940 | 1668 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1669 | } |
7972aab2 DG |
1670 | |
1671 | error: | |
1672 | return; | |
48842b30 DG |
1673 | } |
1674 | ||
78f0bacd DG |
1675 | /* |
1676 | * Lookup sesison wrapper. | |
1677 | */ | |
84cd17c6 MD |
1678 | static |
1679 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1680 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1681 | { |
1682 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1683 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1684 | } |
1685 | ||
421cb601 DG |
1686 | /* |
1687 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1688 | * id. |
421cb601 | 1689 | */ |
48842b30 DG |
1690 | static struct ust_app_session *lookup_session_by_app( |
1691 | struct ltt_ust_session *usess, struct ust_app *app) | |
1692 | { | |
bec39940 | 1693 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1694 | struct lttng_ht_node_u64 *node; |
48842b30 | 1695 | |
84cd17c6 | 1696 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1697 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1698 | if (node == NULL) { |
1699 | goto error; | |
1700 | } | |
1701 | ||
1702 | return caa_container_of(node, struct ust_app_session, node); | |
1703 | ||
1704 | error: | |
1705 | return NULL; | |
1706 | } | |
1707 | ||
7972aab2 DG |
1708 | /* |
1709 | * Setup buffer registry per PID for the given session and application. If none | |
1710 | * is found, a new one is created, added to the global registry and | |
1711 | * initialized. If regp is valid, it's set with the newly created object. | |
1712 | * | |
1713 | * Return 0 on success or else a negative value. | |
1714 | */ | |
1715 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1716 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1717 | { | |
1718 | int ret = 0; | |
1719 | struct buffer_reg_pid *reg_pid; | |
1720 | ||
1721 | assert(ua_sess); | |
1722 | assert(app); | |
1723 | ||
1724 | rcu_read_lock(); | |
1725 | ||
1726 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1727 | if (!reg_pid) { | |
1728 | /* | |
1729 | * This is the create channel path meaning that if there is NO | |
1730 | * registry available, we have to create one for this session. | |
1731 | */ | |
1732 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1733 | if (ret < 0) { | |
1734 | goto error; | |
1735 | } | |
1736 | buffer_reg_pid_add(reg_pid); | |
1737 | } else { | |
1738 | goto end; | |
1739 | } | |
1740 | ||
1741 | /* Initialize registry. */ | |
1742 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1743 | app->bits_per_long, app->uint8_t_alignment, | |
1744 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1745 | app->uint64_t_alignment, app->long_alignment, |
1746 | app->byte_order, app->version.major, | |
1747 | app->version.minor); | |
7972aab2 DG |
1748 | if (ret < 0) { |
1749 | goto error; | |
1750 | } | |
1751 | ||
1752 | DBG3("UST app buffer registry per PID created successfully"); | |
1753 | ||
1754 | end: | |
1755 | if (regp) { | |
1756 | *regp = reg_pid; | |
1757 | } | |
1758 | error: | |
1759 | rcu_read_unlock(); | |
1760 | return ret; | |
1761 | } | |
1762 | ||
1763 | /* | |
1764 | * Setup buffer registry per UID for the given session and application. If none | |
1765 | * is found, a new one is created, added to the global registry and | |
1766 | * initialized. If regp is valid, it's set with the newly created object. | |
1767 | * | |
1768 | * Return 0 on success or else a negative value. | |
1769 | */ | |
1770 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1771 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1772 | { | |
1773 | int ret = 0; | |
1774 | struct buffer_reg_uid *reg_uid; | |
1775 | ||
1776 | assert(usess); | |
1777 | assert(app); | |
1778 | ||
1779 | rcu_read_lock(); | |
1780 | ||
1781 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1782 | if (!reg_uid) { | |
1783 | /* | |
1784 | * This is the create channel path meaning that if there is NO | |
1785 | * registry available, we have to create one for this session. | |
1786 | */ | |
1787 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1788 | LTTNG_DOMAIN_UST, ®_uid); | |
1789 | if (ret < 0) { | |
1790 | goto error; | |
1791 | } | |
1792 | buffer_reg_uid_add(reg_uid); | |
1793 | } else { | |
1794 | goto end; | |
1795 | } | |
1796 | ||
1797 | /* Initialize registry. */ | |
af6142cf | 1798 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1799 | app->bits_per_long, app->uint8_t_alignment, |
1800 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1801 | app->uint64_t_alignment, app->long_alignment, |
1802 | app->byte_order, app->version.major, | |
1803 | app->version.minor); | |
7972aab2 DG |
1804 | if (ret < 0) { |
1805 | goto error; | |
1806 | } | |
1807 | /* Add node to teardown list of the session. */ | |
1808 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1809 | ||
1810 | DBG3("UST app buffer registry per UID created successfully"); | |
1811 | ||
1812 | end: | |
1813 | if (regp) { | |
1814 | *regp = reg_uid; | |
1815 | } | |
1816 | error: | |
1817 | rcu_read_unlock(); | |
1818 | return ret; | |
1819 | } | |
1820 | ||
421cb601 | 1821 | /* |
3d8ca23b | 1822 | * Create a session on the tracer side for the given app. |
421cb601 | 1823 | * |
3d8ca23b DG |
1824 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1825 | * untouched. If the session was created, is_created is set to 1. On error, | |
1826 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1827 | * be NULL. | |
1828 | * | |
1829 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1830 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1831 | */ |
3d8ca23b DG |
1832 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1833 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1834 | int *is_created) | |
421cb601 | 1835 | { |
3d8ca23b | 1836 | int ret, created = 0; |
421cb601 DG |
1837 | struct ust_app_session *ua_sess; |
1838 | ||
3d8ca23b DG |
1839 | assert(usess); |
1840 | assert(app); | |
1841 | assert(ua_sess_ptr); | |
1842 | ||
840cb59c | 1843 | health_code_update(); |
86acf0da | 1844 | |
421cb601 DG |
1845 | ua_sess = lookup_session_by_app(usess, app); |
1846 | if (ua_sess == NULL) { | |
d9bf3ca4 | 1847 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1848 | app->pid, usess->id); |
d0b96690 | 1849 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1850 | if (ua_sess == NULL) { |
1851 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1852 | ret = -ENOMEM; |
1853 | goto error; | |
421cb601 | 1854 | } |
477d7741 | 1855 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1856 | created = 1; |
421cb601 DG |
1857 | } |
1858 | ||
7972aab2 DG |
1859 | switch (usess->buffer_type) { |
1860 | case LTTNG_BUFFER_PER_PID: | |
1861 | /* Init local registry. */ | |
1862 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1863 | if (ret < 0) { |
7972aab2 DG |
1864 | goto error; |
1865 | } | |
1866 | break; | |
1867 | case LTTNG_BUFFER_PER_UID: | |
1868 | /* Look for a global registry. If none exists, create one. */ | |
1869 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1870 | if (ret < 0) { | |
1871 | goto error; | |
1872 | } | |
1873 | break; | |
1874 | default: | |
1875 | assert(0); | |
1876 | ret = -EINVAL; | |
1877 | goto error; | |
1878 | } | |
1879 | ||
1880 | health_code_update(); | |
1881 | ||
1882 | if (ua_sess->handle == -1) { | |
1883 | ret = ustctl_create_session(app->sock); | |
1884 | if (ret < 0) { | |
1885 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1886 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1887 | app->pid, ret); |
1888 | } else { | |
1889 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
1890 | /* |
1891 | * This is normal behavior, an application can die during the | |
1892 | * creation process. Don't report an error so the execution can | |
1893 | * continue normally. This will get flagged ENOTCONN and the | |
1894 | * caller will handle it. | |
1895 | */ | |
1896 | ret = 0; | |
ffe60014 | 1897 | } |
d0b96690 | 1898 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1899 | if (ret != -ENOMEM) { |
1900 | /* | |
1901 | * Tracer is probably gone or got an internal error so let's | |
1902 | * behave like it will soon unregister or not usable. | |
1903 | */ | |
1904 | ret = -ENOTCONN; | |
1905 | } | |
1906 | goto error; | |
421cb601 DG |
1907 | } |
1908 | ||
7972aab2 DG |
1909 | ua_sess->handle = ret; |
1910 | ||
1911 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
1912 | lttng_ht_node_init_u64(&ua_sess->node, |
1913 | ua_sess->tracing_id); | |
1914 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1915 | |
1916 | DBG2("UST app session created successfully with handle %d", ret); | |
1917 | } | |
1918 | ||
1919 | *ua_sess_ptr = ua_sess; | |
1920 | if (is_created) { | |
1921 | *is_created = created; | |
1922 | } | |
1923 | ||
1924 | /* Everything went well. */ | |
1925 | ret = 0; | |
1926 | ||
1927 | error: | |
1928 | health_code_update(); | |
1929 | return ret; | |
1930 | } | |
1931 | ||
1932 | /* | |
1933 | * Create a context for the channel on the tracer. | |
1934 | * | |
1935 | * Called with UST app session lock held and a RCU read side lock. | |
1936 | */ | |
1937 | static | |
1938 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1939 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1940 | struct ust_app *app) | |
1941 | { | |
1942 | int ret = 0; | |
1943 | struct lttng_ht_iter iter; | |
1944 | struct lttng_ht_node_ulong *node; | |
1945 | struct ust_app_ctx *ua_ctx; | |
1946 | ||
1947 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1948 | ||
1949 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); | |
1950 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1951 | if (node != NULL) { | |
1952 | ret = -EEXIST; | |
1953 | goto error; | |
1954 | } | |
1955 | ||
1956 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1957 | if (ua_ctx == NULL) { | |
1958 | /* malloc failed */ | |
1959 | ret = -1; | |
1960 | goto error; | |
1961 | } | |
1962 | ||
1963 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
1964 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
31746f93 | 1965 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
1966 | |
1967 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1968 | if (ret < 0) { | |
1969 | goto error; | |
1970 | } | |
1971 | ||
1972 | error: | |
1973 | return ret; | |
1974 | } | |
1975 | ||
1976 | /* | |
1977 | * Enable on the tracer side a ust app event for the session and channel. | |
1978 | * | |
1979 | * Called with UST app session lock held. | |
1980 | */ | |
1981 | static | |
1982 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
1983 | struct ust_app_event *ua_event, struct ust_app *app) | |
1984 | { | |
1985 | int ret; | |
1986 | ||
1987 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1988 | if (ret < 0) { | |
1989 | goto error; | |
1990 | } | |
1991 | ||
1992 | ua_event->enabled = 1; | |
1993 | ||
1994 | error: | |
1995 | return ret; | |
1996 | } | |
1997 | ||
1998 | /* | |
1999 | * Disable on the tracer side a ust app event for the session and channel. | |
2000 | */ | |
2001 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2002 | struct ust_app_event *ua_event, struct ust_app *app) | |
2003 | { | |
2004 | int ret; | |
2005 | ||
2006 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2007 | if (ret < 0) { | |
2008 | goto error; | |
2009 | } | |
2010 | ||
2011 | ua_event->enabled = 0; | |
2012 | ||
2013 | error: | |
2014 | return ret; | |
2015 | } | |
2016 | ||
2017 | /* | |
2018 | * Lookup ust app channel for session and disable it on the tracer side. | |
2019 | */ | |
2020 | static | |
2021 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2022 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2023 | { | |
2024 | int ret; | |
2025 | ||
2026 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2027 | if (ret < 0) { | |
2028 | goto error; | |
2029 | } | |
2030 | ||
2031 | ua_chan->enabled = 0; | |
2032 | ||
2033 | error: | |
2034 | return ret; | |
2035 | } | |
2036 | ||
2037 | /* | |
2038 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2039 | * MUST be called with a RCU read side lock acquired. | |
2040 | */ | |
2041 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2042 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2043 | { | |
2044 | int ret = 0; | |
2045 | struct lttng_ht_iter iter; | |
2046 | struct lttng_ht_node_str *ua_chan_node; | |
2047 | struct ust_app_channel *ua_chan; | |
2048 | ||
2049 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2050 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2051 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2052 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2053 | uchan->name, ua_sess->tracing_id); |
2054 | goto error; | |
2055 | } | |
2056 | ||
2057 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2058 | ||
2059 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2060 | if (ret < 0) { | |
2061 | goto error; | |
2062 | } | |
2063 | ||
2064 | error: | |
2065 | return ret; | |
2066 | } | |
2067 | ||
2068 | /* | |
2069 | * Ask the consumer to create a channel and get it if successful. | |
2070 | * | |
2071 | * Return 0 on success or else a negative value. | |
2072 | */ | |
2073 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2074 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2075 | int bitness, struct ust_registry_session *registry) | |
2076 | { | |
2077 | int ret; | |
2078 | unsigned int nb_fd = 0; | |
2079 | struct consumer_socket *socket; | |
2080 | ||
2081 | assert(usess); | |
2082 | assert(ua_sess); | |
2083 | assert(ua_chan); | |
2084 | assert(registry); | |
2085 | ||
2086 | rcu_read_lock(); | |
2087 | health_code_update(); | |
2088 | ||
2089 | /* Get the right consumer socket for the application. */ | |
2090 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2091 | if (!socket) { | |
2092 | ret = -EINVAL; | |
2093 | goto error; | |
2094 | } | |
2095 | ||
2096 | health_code_update(); | |
2097 | ||
2098 | /* Need one fd for the channel. */ | |
2099 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2100 | if (ret < 0) { | |
2101 | ERR("Exhausted number of available FD upon create channel"); | |
2102 | goto error; | |
2103 | } | |
2104 | ||
2105 | /* | |
2106 | * Ask consumer to create channel. The consumer will return the number of | |
2107 | * stream we have to expect. | |
2108 | */ | |
2109 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2110 | registry); | |
2111 | if (ret < 0) { | |
2112 | goto error_ask; | |
2113 | } | |
2114 | ||
2115 | /* | |
2116 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2117 | * stream (2 being the default value here). | |
2118 | */ | |
2119 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2120 | ||
2121 | /* Reserve the amount of file descriptor we need. */ | |
2122 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2123 | if (ret < 0) { | |
2124 | ERR("Exhausted number of available FD upon create channel"); | |
2125 | goto error_fd_get_stream; | |
2126 | } | |
2127 | ||
2128 | health_code_update(); | |
2129 | ||
2130 | /* | |
2131 | * Now get the channel from the consumer. This call wil populate the stream | |
2132 | * list of that channel and set the ust objects. | |
2133 | */ | |
d9078d0c DG |
2134 | if (usess->consumer->enabled) { |
2135 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2136 | if (ret < 0) { | |
2137 | goto error_destroy; | |
2138 | } | |
7972aab2 DG |
2139 | } |
2140 | ||
2141 | rcu_read_unlock(); | |
2142 | return 0; | |
2143 | ||
2144 | error_destroy: | |
2145 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2146 | error_fd_get_stream: | |
2147 | /* | |
2148 | * Initiate a destroy channel on the consumer since we had an error | |
2149 | * handling it on our side. The return value is of no importance since we | |
2150 | * already have a ret value set by the previous error that we need to | |
2151 | * return. | |
2152 | */ | |
2153 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2154 | error_ask: | |
2155 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2156 | error: | |
2157 | health_code_update(); | |
2158 | rcu_read_unlock(); | |
2159 | return ret; | |
2160 | } | |
2161 | ||
2162 | /* | |
2163 | * Duplicate the ust data object of the ust app stream and save it in the | |
2164 | * buffer registry stream. | |
2165 | * | |
2166 | * Return 0 on success or else a negative value. | |
2167 | */ | |
2168 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2169 | struct ust_app_stream *stream) | |
2170 | { | |
2171 | int ret; | |
2172 | ||
2173 | assert(reg_stream); | |
2174 | assert(stream); | |
2175 | ||
2176 | /* Reserve the amount of file descriptor we need. */ | |
2177 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2178 | if (ret < 0) { | |
2179 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2180 | goto error; | |
2181 | } | |
2182 | ||
2183 | /* Duplicate object for stream once the original is in the registry. */ | |
2184 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2185 | reg_stream->obj.ust); | |
2186 | if (ret < 0) { | |
2187 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2188 | reg_stream->obj.ust, stream->obj, ret); | |
2189 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2190 | goto error; | |
2191 | } | |
2192 | stream->handle = stream->obj->handle; | |
2193 | ||
2194 | error: | |
2195 | return ret; | |
2196 | } | |
2197 | ||
2198 | /* | |
2199 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2200 | * buffer registry channel. | |
2201 | * | |
2202 | * Return 0 on success or else a negative value. | |
2203 | */ | |
2204 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2205 | struct ust_app_channel *ua_chan) | |
2206 | { | |
2207 | int ret; | |
2208 | ||
2209 | assert(reg_chan); | |
2210 | assert(ua_chan); | |
2211 | ||
2212 | /* Need two fds for the channel. */ | |
2213 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2214 | if (ret < 0) { | |
2215 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2216 | goto error_fd_get; | |
2217 | } | |
2218 | ||
2219 | /* Duplicate object for stream once the original is in the registry. */ | |
2220 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2221 | if (ret < 0) { | |
2222 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2223 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2224 | goto error; | |
2225 | } | |
2226 | ua_chan->handle = ua_chan->obj->handle; | |
2227 | ||
2228 | return 0; | |
2229 | ||
2230 | error: | |
2231 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2232 | error_fd_get: | |
2233 | return ret; | |
2234 | } | |
2235 | ||
2236 | /* | |
2237 | * For a given channel buffer registry, setup all streams of the given ust | |
2238 | * application channel. | |
2239 | * | |
2240 | * Return 0 on success or else a negative value. | |
2241 | */ | |
2242 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2243 | struct ust_app_channel *ua_chan) | |
2244 | { | |
2245 | int ret = 0; | |
2246 | struct ust_app_stream *stream, *stmp; | |
2247 | ||
2248 | assert(reg_chan); | |
2249 | assert(ua_chan); | |
2250 | ||
2251 | DBG2("UST app setup buffer registry stream"); | |
2252 | ||
2253 | /* Send all streams to application. */ | |
2254 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2255 | struct buffer_reg_stream *reg_stream; | |
2256 | ||
2257 | ret = buffer_reg_stream_create(®_stream); | |
2258 | if (ret < 0) { | |
2259 | goto error; | |
2260 | } | |
2261 | ||
2262 | /* | |
2263 | * Keep original pointer and nullify it in the stream so the delete | |
2264 | * stream call does not release the object. | |
2265 | */ | |
2266 | reg_stream->obj.ust = stream->obj; | |
2267 | stream->obj = NULL; | |
2268 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2269 | |
7972aab2 DG |
2270 | /* We don't need the streams anymore. */ |
2271 | cds_list_del(&stream->list); | |
2272 | delete_ust_app_stream(-1, stream); | |
2273 | } | |
421cb601 | 2274 | |
7972aab2 DG |
2275 | error: |
2276 | return ret; | |
2277 | } | |
2278 | ||
2279 | /* | |
2280 | * Create a buffer registry channel for the given session registry and | |
2281 | * application channel object. If regp pointer is valid, it's set with the | |
2282 | * created object. Important, the created object is NOT added to the session | |
2283 | * registry hash table. | |
2284 | * | |
2285 | * Return 0 on success else a negative value. | |
2286 | */ | |
2287 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2288 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2289 | { | |
2290 | int ret; | |
2291 | struct buffer_reg_channel *reg_chan = NULL; | |
2292 | ||
2293 | assert(reg_sess); | |
2294 | assert(ua_chan); | |
2295 | ||
2296 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2297 | ||
2298 | /* Create buffer registry channel. */ | |
2299 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2300 | if (ret < 0) { | |
2301 | goto error_create; | |
421cb601 | 2302 | } |
7972aab2 DG |
2303 | assert(reg_chan); |
2304 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2305 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
421cb601 | 2306 | |
7972aab2 DG |
2307 | /* Create and add a channel registry to session. */ |
2308 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2309 | ua_chan->tracing_channel_id); | |
2310 | if (ret < 0) { | |
2311 | goto error; | |
d88aee68 | 2312 | } |
7972aab2 | 2313 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2314 | |
7972aab2 DG |
2315 | if (regp) { |
2316 | *regp = reg_chan; | |
3d8ca23b | 2317 | } |
d88aee68 | 2318 | |
7972aab2 | 2319 | return 0; |
3d8ca23b DG |
2320 | |
2321 | error: | |
7972aab2 DG |
2322 | /* Safe because the registry channel object was not added to any HT. */ |
2323 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2324 | error_create: | |
3d8ca23b | 2325 | return ret; |
421cb601 DG |
2326 | } |
2327 | ||
55cc08a6 | 2328 | /* |
7972aab2 DG |
2329 | * Setup buffer registry channel for the given session registry and application |
2330 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2331 | * |
7972aab2 | 2332 | * Return 0 on success else a negative value. |
55cc08a6 | 2333 | */ |
7972aab2 DG |
2334 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2335 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2336 | { |
7972aab2 | 2337 | int ret; |
55cc08a6 | 2338 | |
7972aab2 DG |
2339 | assert(reg_sess); |
2340 | assert(reg_chan); | |
2341 | assert(ua_chan); | |
2342 | assert(ua_chan->obj); | |
55cc08a6 | 2343 | |
7972aab2 | 2344 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2345 | |
7972aab2 DG |
2346 | /* Setup all streams for the registry. */ |
2347 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2348 | if (ret < 0) { | |
55cc08a6 DG |
2349 | goto error; |
2350 | } | |
2351 | ||
7972aab2 DG |
2352 | reg_chan->obj.ust = ua_chan->obj; |
2353 | ua_chan->obj = NULL; | |
55cc08a6 | 2354 | |
7972aab2 | 2355 | return 0; |
55cc08a6 DG |
2356 | |
2357 | error: | |
7972aab2 DG |
2358 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2359 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2360 | return ret; |
2361 | } | |
2362 | ||
edb67388 | 2363 | /* |
7972aab2 | 2364 | * Send buffer registry channel to the application. |
d0b96690 | 2365 | * |
7972aab2 | 2366 | * Return 0 on success else a negative value. |
edb67388 | 2367 | */ |
7972aab2 DG |
2368 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2369 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2370 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2371 | { |
2372 | int ret; | |
7972aab2 | 2373 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2374 | |
7972aab2 DG |
2375 | assert(reg_chan); |
2376 | assert(app); | |
2377 | assert(ua_sess); | |
2378 | assert(ua_chan); | |
2379 | ||
2380 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2381 | ||
2382 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2383 | if (ret < 0) { |
2384 | goto error; | |
2385 | } | |
2386 | ||
7972aab2 DG |
2387 | /* Send channel to the application. */ |
2388 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2389 | if (ret < 0) { | |
2390 | goto error; | |
2391 | } | |
2392 | ||
2393 | health_code_update(); | |
2394 | ||
2395 | /* Send all streams to application. */ | |
2396 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2397 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2398 | struct ust_app_stream stream; | |
2399 | ||
2400 | ret = duplicate_stream_object(reg_stream, &stream); | |
2401 | if (ret < 0) { | |
2402 | goto error_stream_unlock; | |
2403 | } | |
2404 | ||
2405 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2406 | if (ret < 0) { | |
8c067051 | 2407 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2408 | goto error_stream_unlock; |
2409 | } | |
edb67388 | 2410 | |
7972aab2 DG |
2411 | /* |
2412 | * The return value is not important here. This function will output an | |
2413 | * error if needed. | |
2414 | */ | |
2415 | (void) release_ust_app_stream(-1, &stream); | |
2416 | } | |
2417 | ua_chan->is_sent = 1; | |
2418 | ||
2419 | error_stream_unlock: | |
2420 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2421 | error: |
2422 | return ret; | |
2423 | } | |
2424 | ||
9730260e | 2425 | /* |
7972aab2 DG |
2426 | * Create and send to the application the created buffers with per UID buffers. |
2427 | * | |
2428 | * Return 0 on success else a negative value. | |
9730260e | 2429 | */ |
7972aab2 DG |
2430 | static int create_channel_per_uid(struct ust_app *app, |
2431 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2432 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2433 | { |
2434 | int ret; | |
7972aab2 DG |
2435 | struct buffer_reg_uid *reg_uid; |
2436 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2437 | |
7972aab2 DG |
2438 | assert(app); |
2439 | assert(usess); | |
2440 | assert(ua_sess); | |
2441 | assert(ua_chan); | |
2442 | ||
2443 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2444 | ||
2445 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2446 | /* | |
2447 | * The session creation handles the creation of this global registry | |
2448 | * object. If none can be find, there is a code flow problem or a | |
2449 | * teardown race. | |
2450 | */ | |
2451 | assert(reg_uid); | |
2452 | ||
2453 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2454 | reg_uid); | |
2455 | if (!reg_chan) { | |
2456 | /* Create the buffer registry channel object. */ | |
2457 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2458 | if (ret < 0) { | |
2459 | goto error; | |
2460 | } | |
2461 | assert(reg_chan); | |
2462 | ||
2463 | /* | |
2464 | * Create the buffers on the consumer side. This call populates the | |
2465 | * ust app channel object with all streams and data object. | |
2466 | */ | |
2467 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2468 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2469 | if (ret < 0) { | |
07d2ae95 DG |
2470 | /* |
2471 | * Let's remove the previously created buffer registry channel so | |
2472 | * it's not visible anymore in the session registry. | |
2473 | */ | |
2474 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2475 | ua_chan->tracing_channel_id); | |
2476 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2477 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2478 | goto error; |
2479 | } | |
2480 | ||
2481 | /* | |
2482 | * Setup the streams and add it to the session registry. | |
2483 | */ | |
2484 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2485 | if (ret < 0) { | |
2486 | goto error; | |
2487 | } | |
2488 | ||
2489 | } | |
2490 | ||
2491 | /* Send buffers to the application. */ | |
2492 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2493 | if (ret < 0) { |
2494 | goto error; | |
2495 | } | |
2496 | ||
9730260e DG |
2497 | error: |
2498 | return ret; | |
2499 | } | |
2500 | ||
78f0bacd | 2501 | /* |
7972aab2 DG |
2502 | * Create and send to the application the created buffers with per PID buffers. |
2503 | * | |
2504 | * Return 0 on success else a negative value. | |
78f0bacd | 2505 | */ |
7972aab2 DG |
2506 | static int create_channel_per_pid(struct ust_app *app, |
2507 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2508 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2509 | { |
8535a6d9 | 2510 | int ret; |
7972aab2 | 2511 | struct ust_registry_session *registry; |
78f0bacd | 2512 | |
7972aab2 DG |
2513 | assert(app); |
2514 | assert(usess); | |
2515 | assert(ua_sess); | |
2516 | assert(ua_chan); | |
2517 | ||
2518 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2519 | ||
2520 | rcu_read_lock(); | |
2521 | ||
2522 | registry = get_session_registry(ua_sess); | |
2523 | assert(registry); | |
2524 | ||
2525 | /* Create and add a new channel registry to session. */ | |
2526 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2527 | if (ret < 0) { |
2528 | goto error; | |
2529 | } | |
2530 | ||
7972aab2 DG |
2531 | /* Create and get channel on the consumer side. */ |
2532 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2533 | app->bits_per_long, registry); | |
2534 | if (ret < 0) { | |
2535 | goto error; | |
2536 | } | |
2537 | ||
2538 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2539 | if (ret < 0) { | |
2540 | goto error; | |
2541 | } | |
8535a6d9 | 2542 | |
78f0bacd | 2543 | error: |
7972aab2 | 2544 | rcu_read_unlock(); |
78f0bacd DG |
2545 | return ret; |
2546 | } | |
2547 | ||
2548 | /* | |
7972aab2 DG |
2549 | * From an already allocated ust app channel, create the channel buffers if |
2550 | * need and send it to the application. This MUST be called with a RCU read | |
2551 | * side lock acquired. | |
2552 | * | |
2553 | * Return 0 on success or else a negative value. | |
78f0bacd | 2554 | */ |
7972aab2 DG |
2555 | static int do_create_channel(struct ust_app *app, |
2556 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2557 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2558 | { |
7972aab2 | 2559 | int ret; |
78f0bacd | 2560 | |
7972aab2 DG |
2561 | assert(app); |
2562 | assert(usess); | |
2563 | assert(ua_sess); | |
2564 | assert(ua_chan); | |
2565 | ||
2566 | /* Handle buffer type before sending the channel to the application. */ | |
2567 | switch (usess->buffer_type) { | |
2568 | case LTTNG_BUFFER_PER_UID: | |
2569 | { | |
2570 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2571 | if (ret < 0) { | |
2572 | goto error; | |
2573 | } | |
2574 | break; | |
2575 | } | |
2576 | case LTTNG_BUFFER_PER_PID: | |
2577 | { | |
2578 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2579 | if (ret < 0) { | |
2580 | goto error; | |
2581 | } | |
2582 | break; | |
2583 | } | |
2584 | default: | |
2585 | assert(0); | |
2586 | ret = -EINVAL; | |
78f0bacd DG |
2587 | goto error; |
2588 | } | |
2589 | ||
7972aab2 DG |
2590 | /* Initialize ust objd object using the received handle and add it. */ |
2591 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2592 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2593 | |
7972aab2 DG |
2594 | /* If channel is not enabled, disable it on the tracer */ |
2595 | if (!ua_chan->enabled) { | |
2596 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2597 | if (ret < 0) { | |
2598 | goto error; | |
2599 | } | |
78f0bacd DG |
2600 | } |
2601 | ||
2602 | error: | |
2603 | return ret; | |
2604 | } | |
2605 | ||
284d8f55 | 2606 | /* |
4d710ac2 DG |
2607 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2608 | * newly created channel if not NULL. | |
d0b96690 | 2609 | * |
36b588ed | 2610 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2611 | * |
2612 | * Return 0 on success or else a negative value. | |
284d8f55 | 2613 | */ |
4d710ac2 DG |
2614 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2615 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2616 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2617 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2618 | { |
2619 | int ret = 0; | |
bec39940 DG |
2620 | struct lttng_ht_iter iter; |
2621 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2622 | struct ust_app_channel *ua_chan; |
2623 | ||
2624 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2625 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2626 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2627 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2628 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2629 | goto end; |
5b4a0ec0 DG |
2630 | } |
2631 | ||
d0b96690 | 2632 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2633 | if (ua_chan == NULL) { |
2634 | /* Only malloc can fail here */ | |
4d710ac2 | 2635 | ret = -ENOMEM; |
094d1690 | 2636 | goto error_alloc; |
fc34caaa DG |
2637 | } |
2638 | shadow_copy_channel(ua_chan, uchan); | |
2639 | ||
ffe60014 DG |
2640 | /* Set channel type. */ |
2641 | ua_chan->attr.type = type; | |
2642 | ||
7972aab2 | 2643 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2644 | if (ret < 0) { |
2645 | goto error; | |
2646 | } | |
2647 | ||
fc34caaa | 2648 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2649 | app->pid); |
fc34caaa | 2650 | |
d0b96690 DG |
2651 | /* Only add the channel if successful on the tracer side. */ |
2652 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2653 | ||
fc34caaa | 2654 | end: |
4d710ac2 DG |
2655 | if (ua_chanp) { |
2656 | *ua_chanp = ua_chan; | |
2657 | } | |
2658 | ||
2659 | /* Everything went well. */ | |
2660 | return 0; | |
5b4a0ec0 DG |
2661 | |
2662 | error: | |
d0b96690 | 2663 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2664 | error_alloc: |
4d710ac2 | 2665 | return ret; |
5b4a0ec0 DG |
2666 | } |
2667 | ||
2668 | /* | |
2669 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2670 | * |
2671 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2672 | */ |
edb67388 DG |
2673 | static |
2674 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2675 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2676 | struct ust_app *app) | |
284d8f55 | 2677 | { |
edb67388 | 2678 | int ret = 0; |
5b4a0ec0 | 2679 | struct ust_app_event *ua_event; |
284d8f55 | 2680 | |
5b4a0ec0 | 2681 | /* Get event node */ |
18eace3b | 2682 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 2683 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 2684 | if (ua_event != NULL) { |
fc34caaa | 2685 | ret = -EEXIST; |
edb67388 DG |
2686 | goto end; |
2687 | } | |
5b4a0ec0 | 2688 | |
edb67388 DG |
2689 | /* Does not exist so create one */ |
2690 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2691 | if (ua_event == NULL) { | |
2692 | /* Only malloc can failed so something is really wrong */ | |
2693 | ret = -ENOMEM; | |
fc34caaa | 2694 | goto end; |
5b4a0ec0 | 2695 | } |
edb67388 | 2696 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2697 | |
edb67388 | 2698 | /* Create it on the tracer side */ |
5b4a0ec0 | 2699 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2700 | if (ret < 0) { |
fc34caaa | 2701 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2702 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2703 | goto error; |
2704 | } | |
2705 | ||
d0b96690 | 2706 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2707 | |
fc34caaa | 2708 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2709 | app->pid); |
7f79d3a1 | 2710 | |
edb67388 | 2711 | end: |
fc34caaa DG |
2712 | return ret; |
2713 | ||
5b4a0ec0 | 2714 | error: |
fc34caaa DG |
2715 | /* Valid. Calling here is already in a read side lock */ |
2716 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2717 | return ret; |
5b4a0ec0 DG |
2718 | } |
2719 | ||
2720 | /* | |
2721 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2722 | * |
7972aab2 | 2723 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2724 | */ |
2725 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 2726 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
2727 | { |
2728 | int ret = 0; | |
ffe60014 | 2729 | struct ust_app_channel *metadata; |
d88aee68 | 2730 | struct consumer_socket *socket; |
7972aab2 | 2731 | struct ust_registry_session *registry; |
5b4a0ec0 | 2732 | |
ffe60014 DG |
2733 | assert(ua_sess); |
2734 | assert(app); | |
d88aee68 | 2735 | assert(consumer); |
5b4a0ec0 | 2736 | |
7972aab2 DG |
2737 | registry = get_session_registry(ua_sess); |
2738 | assert(registry); | |
2739 | ||
1b532a60 DG |
2740 | /* Metadata already exists for this registry or it was closed previously */ |
2741 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2742 | ret = 0; |
2743 | goto error; | |
5b4a0ec0 DG |
2744 | } |
2745 | ||
ffe60014 | 2746 | /* Allocate UST metadata */ |
d0b96690 | 2747 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2748 | if (!metadata) { |
2749 | /* malloc() failed */ | |
2750 | ret = -ENOMEM; | |
2751 | goto error; | |
2752 | } | |
5b4a0ec0 | 2753 | |
ad7a9107 | 2754 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 2755 | |
7972aab2 DG |
2756 | /* Need one fd for the channel. */ |
2757 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2758 | if (ret < 0) { | |
2759 | ERR("Exhausted number of available FD upon create metadata"); | |
2760 | goto error; | |
2761 | } | |
2762 | ||
4dc3dfc5 DG |
2763 | /* Get the right consumer socket for the application. */ |
2764 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2765 | if (!socket) { | |
2766 | ret = -EINVAL; | |
2767 | goto error_consumer; | |
2768 | } | |
2769 | ||
331744e3 JD |
2770 | /* |
2771 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2772 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2773 | * consumer requesting the metadata and the ask_channel call on our side | |
2774 | * did not returned yet. | |
2775 | */ | |
2776 | registry->metadata_key = metadata->key; | |
2777 | ||
d88aee68 DG |
2778 | /* |
2779 | * Ask the metadata channel creation to the consumer. The metadata object | |
2780 | * will be created by the consumer and kept their. However, the stream is | |
2781 | * never added or monitored until we do a first push metadata to the | |
2782 | * consumer. | |
2783 | */ | |
7972aab2 DG |
2784 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2785 | registry); | |
d88aee68 | 2786 | if (ret < 0) { |
f2a444f1 DG |
2787 | /* Nullify the metadata key so we don't try to close it later on. */ |
2788 | registry->metadata_key = 0; | |
d88aee68 DG |
2789 | goto error_consumer; |
2790 | } | |
2791 | ||
2792 | /* | |
2793 | * The setup command will make the metadata stream be sent to the relayd, | |
2794 | * if applicable, and the thread managing the metadatas. This is important | |
2795 | * because after this point, if an error occurs, the only way the stream | |
2796 | * can be deleted is to be monitored in the consumer. | |
2797 | */ | |
7972aab2 | 2798 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2799 | if (ret < 0) { |
f2a444f1 DG |
2800 | /* Nullify the metadata key so we don't try to close it later on. */ |
2801 | registry->metadata_key = 0; | |
d88aee68 | 2802 | goto error_consumer; |
5b4a0ec0 DG |
2803 | } |
2804 | ||
7972aab2 DG |
2805 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2806 | metadata->key, app->pid); | |
5b4a0ec0 | 2807 | |
d88aee68 | 2808 | error_consumer: |
b80f0b6c | 2809 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2810 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2811 | error: |
ffe60014 | 2812 | return ret; |
5b4a0ec0 DG |
2813 | } |
2814 | ||
5b4a0ec0 | 2815 | /* |
d88aee68 DG |
2816 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2817 | * acquired before calling this function. | |
5b4a0ec0 DG |
2818 | */ |
2819 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2820 | { | |
d88aee68 | 2821 | struct ust_app *app = NULL; |
bec39940 DG |
2822 | struct lttng_ht_node_ulong *node; |
2823 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2824 | |
bec39940 DG |
2825 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2826 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2827 | if (node == NULL) { |
2828 | DBG2("UST app no found with pid %d", pid); | |
2829 | goto error; | |
2830 | } | |
5b4a0ec0 DG |
2831 | |
2832 | DBG2("Found UST app by pid %d", pid); | |
2833 | ||
d88aee68 | 2834 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2835 | |
2836 | error: | |
d88aee68 | 2837 | return app; |
5b4a0ec0 DG |
2838 | } |
2839 | ||
d88aee68 DG |
2840 | /* |
2841 | * Allocate and init an UST app object using the registration information and | |
2842 | * the command socket. This is called when the command socket connects to the | |
2843 | * session daemon. | |
2844 | * | |
2845 | * The object is returned on success or else NULL. | |
2846 | */ | |
d0b96690 | 2847 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2848 | { |
d0b96690 DG |
2849 | struct ust_app *lta = NULL; |
2850 | ||
2851 | assert(msg); | |
2852 | assert(sock >= 0); | |
2853 | ||
2854 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2855 | |
173af62f DG |
2856 | if ((msg->bits_per_long == 64 && |
2857 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2858 | || (msg->bits_per_long == 32 && | |
2859 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2860 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2861 | "%d-bit long, but no consumerd for this size is available.\n", |
2862 | msg->name, msg->pid, msg->bits_per_long); | |
2863 | goto error; | |
3f2c5fcc | 2864 | } |
d0b96690 | 2865 | |
5b4a0ec0 DG |
2866 | lta = zmalloc(sizeof(struct ust_app)); |
2867 | if (lta == NULL) { | |
2868 | PERROR("malloc"); | |
d0b96690 | 2869 | goto error; |
5b4a0ec0 DG |
2870 | } |
2871 | ||
2872 | lta->ppid = msg->ppid; | |
2873 | lta->uid = msg->uid; | |
2874 | lta->gid = msg->gid; | |
d0b96690 | 2875 | |
7753dea8 | 2876 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2877 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2878 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2879 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2880 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2881 | lta->long_alignment = msg->long_alignment; | |
2882 | lta->byte_order = msg->byte_order; | |
2883 | ||
5b4a0ec0 DG |
2884 | lta->v_major = msg->major; |
2885 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 2886 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
2887 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2888 | lta->notify_sock = -1; | |
d88aee68 DG |
2889 | |
2890 | /* Copy name and make sure it's NULL terminated. */ | |
2891 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2892 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2893 | ||
2894 | /* | |
2895 | * Before this can be called, when receiving the registration information, | |
2896 | * the application compatibility is checked. So, at this point, the | |
2897 | * application can work with this session daemon. | |
2898 | */ | |
d0b96690 | 2899 | lta->compatible = 1; |
5b4a0ec0 | 2900 | |
852d0037 | 2901 | lta->pid = msg->pid; |
d0b96690 | 2902 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2903 | lta->sock = sock; |
d0b96690 | 2904 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2905 | |
d42f20df DG |
2906 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2907 | ||
d0b96690 DG |
2908 | error: |
2909 | return lta; | |
2910 | } | |
2911 | ||
d88aee68 DG |
2912 | /* |
2913 | * For a given application object, add it to every hash table. | |
2914 | */ | |
d0b96690 DG |
2915 | void ust_app_add(struct ust_app *app) |
2916 | { | |
2917 | assert(app); | |
2918 | assert(app->notify_sock >= 0); | |
2919 | ||
5b4a0ec0 | 2920 | rcu_read_lock(); |
852d0037 DG |
2921 | |
2922 | /* | |
2923 | * On a re-registration, we want to kick out the previous registration of | |
2924 | * that pid | |
2925 | */ | |
d0b96690 | 2926 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
2927 | |
2928 | /* | |
2929 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
2930 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
2931 | * already in the table. | |
2932 | */ | |
d0b96690 | 2933 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 2934 | |
d0b96690 DG |
2935 | /* Add application to the notify socket hash table. */ |
2936 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
2937 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 2938 | |
d0b96690 | 2939 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
2940 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
2941 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
2942 | app->v_minor); | |
5b4a0ec0 | 2943 | |
d0b96690 DG |
2944 | rcu_read_unlock(); |
2945 | } | |
2946 | ||
d88aee68 DG |
2947 | /* |
2948 | * Set the application version into the object. | |
2949 | * | |
2950 | * Return 0 on success else a negative value either an errno code or a | |
2951 | * LTTng-UST error code. | |
2952 | */ | |
d0b96690 DG |
2953 | int ust_app_version(struct ust_app *app) |
2954 | { | |
d88aee68 DG |
2955 | int ret; |
2956 | ||
d0b96690 | 2957 | assert(app); |
d88aee68 DG |
2958 | |
2959 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2960 | if (ret < 0) { | |
2961 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2962 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2963 | } else { | |
2964 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2965 | } | |
2966 | } | |
2967 | ||
2968 | return ret; | |
5b4a0ec0 DG |
2969 | } |
2970 | ||
2971 | /* | |
2972 | * Unregister app by removing it from the global traceable app list and freeing | |
2973 | * the data struct. | |
2974 | * | |
2975 | * The socket is already closed at this point so no close to sock. | |
2976 | */ | |
2977 | void ust_app_unregister(int sock) | |
2978 | { | |
2979 | struct ust_app *lta; | |
bec39940 DG |
2980 | struct lttng_ht_node_ulong *node; |
2981 | struct lttng_ht_iter iter; | |
d42f20df | 2982 | struct ust_app_session *ua_sess; |
525b0740 | 2983 | int ret; |
5b4a0ec0 DG |
2984 | |
2985 | rcu_read_lock(); | |
886459c6 | 2986 | |
5b4a0ec0 | 2987 | /* Get the node reference for a call_rcu */ |
852d0037 | 2988 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 2989 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 2990 | assert(node); |
284d8f55 | 2991 | |
852d0037 | 2992 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
2993 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
2994 | ||
886459c6 | 2995 | /* Remove application from PID hash table */ |
852d0037 DG |
2996 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
2997 | assert(!ret); | |
2998 | ||
d88aee68 DG |
2999 | /* |
3000 | * Remove application from notify hash table. The thread handling the | |
3001 | * notify socket could have deleted the node so ignore on error because | |
3002 | * either way it's valid. The close of that socket is handled by the other | |
3003 | * thread. | |
3004 | */ | |
d0b96690 | 3005 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 3006 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 3007 | |
5b98a774 DG |
3008 | /* |
3009 | * Ignore return value since the node might have been removed before by an | |
3010 | * add replace during app registration because the PID can be reassigned by | |
3011 | * the OS. | |
3012 | */ | |
d0b96690 | 3013 | iter.iter.node = <a->pid_n.node; |
bec39940 | 3014 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
3015 | if (ret) { |
3016 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3017 | lta->pid); | |
3018 | } | |
852d0037 | 3019 | |
d42f20df DG |
3020 | /* Remove sessions so they are not visible during deletion.*/ |
3021 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
3022 | node.node) { | |
7972aab2 DG |
3023 | struct ust_registry_session *registry; |
3024 | ||
d42f20df DG |
3025 | ret = lttng_ht_del(lta->sessions, &iter); |
3026 | if (ret) { | |
3027 | /* The session was already removed so scheduled for teardown. */ | |
3028 | continue; | |
3029 | } | |
3030 | ||
3031 | /* | |
3032 | * Add session to list for teardown. This is safe since at this point we | |
3033 | * are the only one using this list. | |
3034 | */ | |
d88aee68 DG |
3035 | pthread_mutex_lock(&ua_sess->lock); |
3036 | ||
3037 | /* | |
3038 | * Normally, this is done in the delete session process which is | |
3039 | * executed in the call rcu below. However, upon registration we can't | |
3040 | * afford to wait for the grace period before pushing data or else the | |
3041 | * data pending feature can race between the unregistration and stop | |
3042 | * command where the data pending command is sent *before* the grace | |
3043 | * period ended. | |
3044 | * | |
3045 | * The close metadata below nullifies the metadata pointer in the | |
3046 | * session so the delete session will NOT push/close a second time. | |
3047 | */ | |
7972aab2 | 3048 | registry = get_session_registry(ua_sess); |
1b532a60 | 3049 | if (registry && !registry->metadata_closed) { |
7972aab2 DG |
3050 | /* Push metadata for application before freeing the application. */ |
3051 | (void) push_metadata(registry, ua_sess->consumer); | |
3052 | ||
3053 | /* | |
3054 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3055 | * metadata only on destroy trace session in this case. Also, the |
3056 | * previous push metadata could have flag the metadata registry to | |
3057 | * close so don't send a close command if closed. | |
7972aab2 | 3058 | */ |
1b532a60 DG |
3059 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
3060 | !registry->metadata_closed) { | |
7972aab2 DG |
3061 | /* And ask to close it for this session registry. */ |
3062 | (void) close_metadata(registry, ua_sess->consumer); | |
3063 | } | |
3064 | } | |
d88aee68 | 3065 | |
d42f20df | 3066 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 3067 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3068 | } |
3069 | ||
852d0037 DG |
3070 | /* Free memory */ |
3071 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3072 | ||
5b4a0ec0 DG |
3073 | rcu_read_unlock(); |
3074 | return; | |
284d8f55 DG |
3075 | } |
3076 | ||
5b4a0ec0 DG |
3077 | /* |
3078 | * Fill events array with all events name of all registered apps. | |
3079 | */ | |
3080 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3081 | { |
5b4a0ec0 DG |
3082 | int ret, handle; |
3083 | size_t nbmem, count = 0; | |
bec39940 | 3084 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3085 | struct ust_app *app; |
c617c0c6 | 3086 | struct lttng_event *tmp_event; |
421cb601 | 3087 | |
5b4a0ec0 | 3088 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3089 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3090 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3091 | PERROR("zmalloc ust app events"); |
3092 | ret = -ENOMEM; | |
421cb601 DG |
3093 | goto error; |
3094 | } | |
3095 | ||
5b4a0ec0 | 3096 | rcu_read_lock(); |
421cb601 | 3097 | |
852d0037 | 3098 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3099 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3100 | |
840cb59c | 3101 | health_code_update(); |
86acf0da | 3102 | |
e0c7ec2b DG |
3103 | if (!app->compatible) { |
3104 | /* | |
3105 | * TODO: In time, we should notice the caller of this error by | |
3106 | * telling him that this is a version error. | |
3107 | */ | |
3108 | continue; | |
3109 | } | |
852d0037 | 3110 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3111 | if (handle < 0) { |
ffe60014 DG |
3112 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3113 | ERR("UST app list events getting handle failed for app pid %d", | |
3114 | app->pid); | |
3115 | } | |
5b4a0ec0 DG |
3116 | continue; |
3117 | } | |
421cb601 | 3118 | |
852d0037 | 3119 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3120 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3121 | /* Handle ustctl error. */ |
3122 | if (ret < 0) { | |
a2ba1ab0 | 3123 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3124 | ERR("UST app tp list get failed for app %d with ret %d", |
3125 | app->sock, ret); | |
3126 | } else { | |
3127 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3128 | /* |
3129 | * This is normal behavior, an application can die during the | |
3130 | * creation process. Don't report an error so the execution can | |
3131 | * continue normally. Continue normal execution. | |
3132 | */ | |
3133 | break; | |
ffe60014 | 3134 | } |
98f595d4 | 3135 | free(tmp_event); |
ffe60014 DG |
3136 | goto rcu_error; |
3137 | } | |
3138 | ||
840cb59c | 3139 | health_code_update(); |
815564d8 | 3140 | if (count >= nbmem) { |
d7b3776f | 3141 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3142 | struct lttng_event *new_tmp_event; |
3143 | size_t new_nbmem; | |
3144 | ||
3145 | new_nbmem = nbmem << 1; | |
3146 | DBG2("Reallocating event list from %zu to %zu entries", | |
3147 | nbmem, new_nbmem); | |
3148 | new_tmp_event = realloc(tmp_event, | |
3149 | new_nbmem * sizeof(struct lttng_event)); | |
3150 | if (new_tmp_event == NULL) { | |
5b4a0ec0 | 3151 | PERROR("realloc ust app events"); |
c617c0c6 | 3152 | free(tmp_event); |
5b4a0ec0 DG |
3153 | ret = -ENOMEM; |
3154 | goto rcu_error; | |
3155 | } | |
53efb85a MD |
3156 | /* Zero the new memory */ |
3157 | memset(new_tmp_event + nbmem, 0, | |
3158 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3159 | nbmem = new_nbmem; | |
3160 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3161 | } |
c617c0c6 MD |
3162 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3163 | tmp_event[count].loglevel = uiter.loglevel; | |
3164 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3165 | tmp_event[count].pid = app->pid; | |
3166 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3167 | count++; |
421cb601 | 3168 | } |
421cb601 DG |
3169 | } |
3170 | ||
5b4a0ec0 | 3171 | ret = count; |
c617c0c6 | 3172 | *events = tmp_event; |
421cb601 | 3173 | |
5b4a0ec0 | 3174 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3175 | |
5b4a0ec0 DG |
3176 | rcu_error: |
3177 | rcu_read_unlock(); | |
421cb601 | 3178 | error: |
840cb59c | 3179 | health_code_update(); |
5b4a0ec0 | 3180 | return ret; |
421cb601 DG |
3181 | } |
3182 | ||
f37d259d MD |
3183 | /* |
3184 | * Fill events array with all events name of all registered apps. | |
3185 | */ | |
3186 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3187 | { | |
3188 | int ret, handle; | |
3189 | size_t nbmem, count = 0; | |
3190 | struct lttng_ht_iter iter; | |
3191 | struct ust_app *app; | |
c617c0c6 | 3192 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3193 | |
3194 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3195 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3196 | if (tmp_event == NULL) { | |
f37d259d MD |
3197 | PERROR("zmalloc ust app event fields"); |
3198 | ret = -ENOMEM; | |
3199 | goto error; | |
3200 | } | |
3201 | ||
3202 | rcu_read_lock(); | |
3203 | ||
3204 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3205 | struct lttng_ust_field_iter uiter; | |
3206 | ||
840cb59c | 3207 | health_code_update(); |
86acf0da | 3208 | |
f37d259d MD |
3209 | if (!app->compatible) { |
3210 | /* | |
3211 | * TODO: In time, we should notice the caller of this error by | |
3212 | * telling him that this is a version error. | |
3213 | */ | |
3214 | continue; | |
3215 | } | |
3216 | handle = ustctl_tracepoint_field_list(app->sock); | |
3217 | if (handle < 0) { | |
ffe60014 DG |
3218 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3219 | ERR("UST app list field getting handle failed for app pid %d", | |
3220 | app->pid); | |
3221 | } | |
f37d259d MD |
3222 | continue; |
3223 | } | |
3224 | ||
3225 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3226 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3227 | /* Handle ustctl error. */ |
3228 | if (ret < 0) { | |
a2ba1ab0 | 3229 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3230 | ERR("UST app tp list field failed for app %d with ret %d", |
3231 | app->sock, ret); | |
3232 | } else { | |
3233 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3234 | /* |
3235 | * This is normal behavior, an application can die during the | |
3236 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3237 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3238 | */ |
3239 | break; | |
ffe60014 | 3240 | } |
98f595d4 | 3241 | free(tmp_event); |
ffe60014 DG |
3242 | goto rcu_error; |
3243 | } | |
3244 | ||
840cb59c | 3245 | health_code_update(); |
f37d259d | 3246 | if (count >= nbmem) { |
d7b3776f | 3247 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3248 | struct lttng_event_field *new_tmp_event; |
3249 | size_t new_nbmem; | |
3250 | ||
3251 | new_nbmem = nbmem << 1; | |
3252 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3253 | nbmem, new_nbmem); | |
3254 | new_tmp_event = realloc(tmp_event, | |
3255 | new_nbmem * sizeof(struct lttng_event_field)); | |
3256 | if (new_tmp_event == NULL) { | |
f37d259d | 3257 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3258 | free(tmp_event); |
f37d259d MD |
3259 | ret = -ENOMEM; |
3260 | goto rcu_error; | |
3261 | } | |
53efb85a MD |
3262 | /* Zero the new memory */ |
3263 | memset(new_tmp_event + nbmem, 0, | |
3264 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3265 | nbmem = new_nbmem; | |
3266 | tmp_event = new_tmp_event; | |
f37d259d | 3267 | } |
f37d259d | 3268 | |
c617c0c6 | 3269 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3270 | /* Mapping between these enums matches 1 to 1. */ |
3271 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3272 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3273 | |
c617c0c6 MD |
3274 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3275 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3276 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3277 | tmp_event[count].event.pid = app->pid; |
3278 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3279 | count++; |
3280 | } | |
3281 | } | |
3282 | ||
3283 | ret = count; | |
c617c0c6 | 3284 | *fields = tmp_event; |
f37d259d MD |
3285 | |
3286 | DBG2("UST app list event fields done (%zu events)", count); | |
3287 | ||
3288 | rcu_error: | |
3289 | rcu_read_unlock(); | |
3290 | error: | |
840cb59c | 3291 | health_code_update(); |
f37d259d MD |
3292 | return ret; |
3293 | } | |
3294 | ||
5b4a0ec0 DG |
3295 | /* |
3296 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3297 | * |
3298 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3299 | */ |
3300 | void ust_app_clean_list(void) | |
421cb601 | 3301 | { |
5b4a0ec0 | 3302 | int ret; |
659ed79f | 3303 | struct ust_app *app; |
bec39940 | 3304 | struct lttng_ht_iter iter; |
421cb601 | 3305 | |
5b4a0ec0 | 3306 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3307 | |
5b4a0ec0 | 3308 | rcu_read_lock(); |
421cb601 | 3309 | |
659ed79f | 3310 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3311 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3312 | assert(!ret); |
659ed79f | 3313 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3314 | } |
3315 | ||
852d0037 | 3316 | /* Cleanup socket hash table */ |
659ed79f DG |
3317 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3318 | sock_n.node) { | |
852d0037 | 3319 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3320 | assert(!ret); |
3321 | } | |
852d0037 | 3322 | |
d88aee68 DG |
3323 | /* Cleanup notify socket hash table */ |
3324 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3325 | notify_sock_n.node) { | |
3326 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3327 | assert(!ret); | |
3328 | } | |
36b588ed | 3329 | rcu_read_unlock(); |
d88aee68 | 3330 | |
bec39940 | 3331 | /* Destroy is done only when the ht is empty */ |
0b2dc8df MD |
3332 | ht_cleanup_push(ust_app_ht); |
3333 | ht_cleanup_push(ust_app_ht_by_sock); | |
3334 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
5b4a0ec0 DG |
3335 | } |
3336 | ||
3337 | /* | |
3338 | * Init UST app hash table. | |
3339 | */ | |
3340 | void ust_app_ht_alloc(void) | |
3341 | { | |
bec39940 | 3342 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3343 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3344 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3345 | } |
3346 | ||
78f0bacd DG |
3347 | /* |
3348 | * For a specific UST session, disable the channel for all registered apps. | |
3349 | */ | |
35a9059d | 3350 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3351 | struct ltt_ust_channel *uchan) |
3352 | { | |
3353 | int ret = 0; | |
bec39940 DG |
3354 | struct lttng_ht_iter iter; |
3355 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3356 | struct ust_app *app; |
3357 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3358 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3359 | |
3360 | if (usess == NULL || uchan == NULL) { | |
3361 | ERR("Disabling UST global channel with NULL values"); | |
3362 | ret = -1; | |
3363 | goto error; | |
3364 | } | |
3365 | ||
d9bf3ca4 | 3366 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3367 | uchan->name, usess->id); |
78f0bacd DG |
3368 | |
3369 | rcu_read_lock(); | |
3370 | ||
3371 | /* For every registered applications */ | |
852d0037 | 3372 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3373 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3374 | if (!app->compatible) { |
3375 | /* | |
3376 | * TODO: In time, we should notice the caller of this error by | |
3377 | * telling him that this is a version error. | |
3378 | */ | |
3379 | continue; | |
3380 | } | |
78f0bacd DG |
3381 | ua_sess = lookup_session_by_app(usess, app); |
3382 | if (ua_sess == NULL) { | |
3383 | continue; | |
3384 | } | |
3385 | ||
8535a6d9 | 3386 | /* Get channel */ |
bec39940 DG |
3387 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3388 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3389 | /* If the session if found for the app, the channel must be there */ |
3390 | assert(ua_chan_node); | |
3391 | ||
3392 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3393 | /* The channel must not be already disabled */ | |
3394 | assert(ua_chan->enabled == 1); | |
3395 | ||
3396 | /* Disable channel onto application */ | |
3397 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3398 | if (ret < 0) { |
3399 | /* XXX: We might want to report this error at some point... */ | |
3400 | continue; | |
3401 | } | |
3402 | } | |
3403 | ||
3404 | rcu_read_unlock(); | |
3405 | ||
3406 | error: | |
3407 | return ret; | |
3408 | } | |
3409 | ||
3410 | /* | |
3411 | * For a specific UST session, enable the channel for all registered apps. | |
3412 | */ | |
35a9059d | 3413 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3414 | struct ltt_ust_channel *uchan) |
3415 | { | |
3416 | int ret = 0; | |
bec39940 | 3417 | struct lttng_ht_iter iter; |
78f0bacd DG |
3418 | struct ust_app *app; |
3419 | struct ust_app_session *ua_sess; | |
3420 | ||
3421 | if (usess == NULL || uchan == NULL) { | |
3422 | ERR("Adding UST global channel to NULL values"); | |
3423 | ret = -1; | |
3424 | goto error; | |
3425 | } | |
3426 | ||
d9bf3ca4 | 3427 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3428 | uchan->name, usess->id); |
78f0bacd DG |
3429 | |
3430 | rcu_read_lock(); | |
3431 | ||
3432 | /* For every registered applications */ | |
852d0037 | 3433 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3434 | if (!app->compatible) { |
3435 | /* | |
3436 | * TODO: In time, we should notice the caller of this error by | |
3437 | * telling him that this is a version error. | |
3438 | */ | |
3439 | continue; | |
3440 | } | |
78f0bacd DG |
3441 | ua_sess = lookup_session_by_app(usess, app); |
3442 | if (ua_sess == NULL) { | |
3443 | continue; | |
3444 | } | |
3445 | ||
3446 | /* Enable channel onto application */ | |
3447 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3448 | if (ret < 0) { | |
3449 | /* XXX: We might want to report this error at some point... */ | |
3450 | continue; | |
3451 | } | |
3452 | } | |
3453 | ||
3454 | rcu_read_unlock(); | |
3455 | ||
3456 | error: | |
3457 | return ret; | |
3458 | } | |
3459 | ||
b0a40d28 DG |
3460 | /* |
3461 | * Disable an event in a channel and for a specific session. | |
3462 | */ | |
35a9059d DG |
3463 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3464 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3465 | { |
3466 | int ret = 0; | |
bec39940 DG |
3467 | struct lttng_ht_iter iter, uiter; |
3468 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3469 | struct ust_app *app; |
3470 | struct ust_app_session *ua_sess; | |
3471 | struct ust_app_channel *ua_chan; | |
3472 | struct ust_app_event *ua_event; | |
3473 | ||
3474 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3475 | "%s for session id %" PRIu64, |
3476 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3477 | |
3478 | rcu_read_lock(); | |
3479 | ||
3480 | /* For all registered applications */ | |
852d0037 | 3481 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3482 | if (!app->compatible) { |
3483 | /* | |
3484 | * TODO: In time, we should notice the caller of this error by | |
3485 | * telling him that this is a version error. | |
3486 | */ | |
3487 | continue; | |
3488 | } | |
b0a40d28 DG |
3489 | ua_sess = lookup_session_by_app(usess, app); |
3490 | if (ua_sess == NULL) { | |
3491 | /* Next app */ | |
3492 | continue; | |
3493 | } | |
3494 | ||
3495 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3496 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3497 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3498 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3499 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3500 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3501 | continue; |
3502 | } | |
3503 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3504 | ||
bec39940 DG |
3505 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3506 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3507 | if (ua_event_node == NULL) { |
3508 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3509 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3510 | continue; |
3511 | } | |
3512 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3513 | ||
7f79d3a1 | 3514 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3515 | if (ret < 0) { |
3516 | /* XXX: Report error someday... */ | |
3517 | continue; | |
3518 | } | |
3519 | } | |
3520 | ||
3521 | rcu_read_unlock(); | |
3522 | ||
3523 | return ret; | |
3524 | } | |
3525 | ||
421cb601 | 3526 | /* |
5b4a0ec0 | 3527 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3528 | */ |
35a9059d | 3529 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3530 | struct ltt_ust_channel *uchan) |
3531 | { | |
3d8ca23b | 3532 | int ret = 0, created; |
bec39940 | 3533 | struct lttng_ht_iter iter; |
48842b30 | 3534 | struct ust_app *app; |
3d8ca23b | 3535 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3536 | |
fc34caaa DG |
3537 | /* Very wrong code flow */ |
3538 | assert(usess); | |
3539 | assert(uchan); | |
421cb601 | 3540 | |
d9bf3ca4 | 3541 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3542 | uchan->name, usess->id); |
48842b30 DG |
3543 | |
3544 | rcu_read_lock(); | |
421cb601 | 3545 | |
5b4a0ec0 | 3546 | /* For every registered applications */ |
852d0037 | 3547 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3548 | if (!app->compatible) { |
3549 | /* | |
3550 | * TODO: In time, we should notice the caller of this error by | |
3551 | * telling him that this is a version error. | |
3552 | */ | |
3553 | continue; | |
3554 | } | |
edb67388 DG |
3555 | /* |
3556 | * Create session on the tracer side and add it to app session HT. Note | |
3557 | * that if session exist, it will simply return a pointer to the ust | |
3558 | * app session. | |
3559 | */ | |
3d8ca23b DG |
3560 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3561 | if (ret < 0) { | |
3562 | switch (ret) { | |
3563 | case -ENOTCONN: | |
3564 | /* | |
3565 | * The application's socket is not valid. Either a bad socket | |
3566 | * or a timeout on it. We can't inform the caller that for a | |
3567 | * specific app, the session failed so lets continue here. | |
3568 | */ | |
3569 | continue; | |
3570 | case -ENOMEM: | |
3571 | default: | |
3572 | goto error_rcu_unlock; | |
3573 | } | |
48842b30 | 3574 | } |
3d8ca23b | 3575 | assert(ua_sess); |
48842b30 | 3576 | |
d0b96690 | 3577 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3578 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3579 | sizeof(uchan->name))) { | |
ad7a9107 DG |
3580 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
3581 | ret = 0; | |
d65d2de8 DG |
3582 | } else { |
3583 | /* Create channel onto application. We don't need the chan ref. */ | |
3584 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3585 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3586 | } | |
d0b96690 | 3587 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3588 | if (ret < 0) { |
3589 | if (ret == -ENOMEM) { | |
3590 | /* No more memory is a fatal error. Stop right now. */ | |
3591 | goto error_rcu_unlock; | |
3592 | } | |
3593 | /* Cleanup the created session if it's the case. */ | |
3594 | if (created) { | |
d0b96690 | 3595 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3596 | } |
48842b30 | 3597 | } |
48842b30 | 3598 | } |
5b4a0ec0 | 3599 | |
95e047ff | 3600 | error_rcu_unlock: |
48842b30 | 3601 | rcu_read_unlock(); |
3c14c33f | 3602 | return ret; |
48842b30 DG |
3603 | } |
3604 | ||
5b4a0ec0 | 3605 | /* |
edb67388 | 3606 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3607 | */ |
35a9059d | 3608 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3609 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3610 | { | |
3611 | int ret = 0; | |
bec39940 | 3612 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3613 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3614 | struct ust_app *app; |
3615 | struct ust_app_session *ua_sess; | |
3616 | struct ust_app_channel *ua_chan; | |
3617 | struct ust_app_event *ua_event; | |
48842b30 | 3618 | |
d9bf3ca4 | 3619 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3620 | uevent->attr.name, usess->id); |
48842b30 | 3621 | |
edb67388 DG |
3622 | /* |
3623 | * NOTE: At this point, this function is called only if the session and | |
3624 | * channel passed are already created for all apps. and enabled on the | |
3625 | * tracer also. | |
3626 | */ | |
3627 | ||
48842b30 | 3628 | rcu_read_lock(); |
421cb601 DG |
3629 | |
3630 | /* For all registered applications */ | |
852d0037 | 3631 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3632 | if (!app->compatible) { |
3633 | /* | |
3634 | * TODO: In time, we should notice the caller of this error by | |
3635 | * telling him that this is a version error. | |
3636 | */ | |
3637 | continue; | |
3638 | } | |
edb67388 | 3639 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3640 | if (!ua_sess) { |
3641 | /* The application has problem or is probably dead. */ | |
3642 | continue; | |
3643 | } | |
ba767faf | 3644 | |
d0b96690 DG |
3645 | pthread_mutex_lock(&ua_sess->lock); |
3646 | ||
edb67388 | 3647 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3648 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3649 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3650 | /* If the channel is not found, there is a code flow error */ |
3651 | assert(ua_chan_node); | |
3652 | ||
3653 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3654 | ||
18eace3b DG |
3655 | /* Get event node */ |
3656 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 3657 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3658 | if (ua_event == NULL) { |
7f79d3a1 | 3659 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3660 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3661 | goto next_app; |
35a9059d | 3662 | } |
35a9059d DG |
3663 | |
3664 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3665 | if (ret < 0) { | |
d0b96690 | 3666 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3667 | goto error; |
48842b30 | 3668 | } |
d0b96690 DG |
3669 | next_app: |
3670 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3671 | } |
3672 | ||
7f79d3a1 | 3673 | error: |
edb67388 | 3674 | rcu_read_unlock(); |
edb67388 DG |
3675 | return ret; |
3676 | } | |
3677 | ||
3678 | /* | |
3679 | * For a specific existing UST session and UST channel, creates the event for | |
3680 | * all registered apps. | |
3681 | */ | |
35a9059d | 3682 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3683 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3684 | { | |
3685 | int ret = 0; | |
bec39940 DG |
3686 | struct lttng_ht_iter iter, uiter; |
3687 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3688 | struct ust_app *app; |
3689 | struct ust_app_session *ua_sess; | |
3690 | struct ust_app_channel *ua_chan; | |
3691 | ||
d9bf3ca4 | 3692 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3693 | uevent->attr.name, usess->id); |
edb67388 | 3694 | |
edb67388 DG |
3695 | rcu_read_lock(); |
3696 | ||
3697 | /* For all registered applications */ | |
852d0037 | 3698 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3699 | if (!app->compatible) { |
3700 | /* | |
3701 | * TODO: In time, we should notice the caller of this error by | |
3702 | * telling him that this is a version error. | |
3703 | */ | |
3704 | continue; | |
3705 | } | |
edb67388 | 3706 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3707 | if (!ua_sess) { |
3708 | /* The application has problem or is probably dead. */ | |
3709 | continue; | |
3710 | } | |
48842b30 | 3711 | |
d0b96690 | 3712 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3713 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3714 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3715 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3716 | /* If the channel is not found, there is a code flow error */ |
3717 | assert(ua_chan_node); | |
3718 | ||
48842b30 DG |
3719 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3720 | ||
edb67388 | 3721 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3722 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3723 | if (ret < 0) { |
49c336c1 | 3724 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3725 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3726 | break; | |
3727 | } | |
3728 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3729 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3730 | continue; |
48842b30 | 3731 | } |
48842b30 | 3732 | } |
5b4a0ec0 | 3733 | |
48842b30 DG |
3734 | rcu_read_unlock(); |
3735 | ||
3736 | return ret; | |
3737 | } | |
3738 | ||
5b4a0ec0 DG |
3739 | /* |
3740 | * Start tracing for a specific UST session and app. | |
3741 | */ | |
b34cbebf | 3742 | static |
421cb601 | 3743 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3744 | { |
3745 | int ret = 0; | |
48842b30 | 3746 | struct ust_app_session *ua_sess; |
48842b30 | 3747 | |
852d0037 | 3748 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3749 | |
509cbaf8 MD |
3750 | rcu_read_lock(); |
3751 | ||
e0c7ec2b DG |
3752 | if (!app->compatible) { |
3753 | goto end; | |
3754 | } | |
3755 | ||
421cb601 DG |
3756 | ua_sess = lookup_session_by_app(usess, app); |
3757 | if (ua_sess == NULL) { | |
d42f20df DG |
3758 | /* The session is in teardown process. Ignore and continue. */ |
3759 | goto end; | |
421cb601 | 3760 | } |
48842b30 | 3761 | |
d0b96690 DG |
3762 | pthread_mutex_lock(&ua_sess->lock); |
3763 | ||
aea829b3 DG |
3764 | /* Upon restart, we skip the setup, already done */ |
3765 | if (ua_sess->started) { | |
8be98f9a | 3766 | goto skip_setup; |
aea829b3 | 3767 | } |
8be98f9a | 3768 | |
a4b92340 DG |
3769 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3770 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3771 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3772 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3773 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3774 | if (ret < 0) { |
3775 | if (ret != -EEXIST) { | |
3776 | ERR("Trace directory creation error"); | |
d0b96690 | 3777 | goto error_unlock; |
421cb601 | 3778 | } |
173af62f | 3779 | } |
7753dea8 | 3780 | } |
aea829b3 | 3781 | |
d65d2de8 DG |
3782 | /* |
3783 | * Create the metadata for the application. This returns gracefully if a | |
3784 | * metadata was already set for the session. | |
3785 | */ | |
ad7a9107 | 3786 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 3787 | if (ret < 0) { |
d0b96690 | 3788 | goto error_unlock; |
421cb601 | 3789 | } |
48842b30 | 3790 | |
840cb59c | 3791 | health_code_update(); |
86acf0da | 3792 | |
8be98f9a | 3793 | skip_setup: |
421cb601 | 3794 | /* This start the UST tracing */ |
852d0037 | 3795 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3796 | if (ret < 0) { |
ffe60014 DG |
3797 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3798 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3799 | app->pid, ret); | |
3800 | } else { | |
3801 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
3802 | /* |
3803 | * This is normal behavior, an application can die during the | |
3804 | * creation process. Don't report an error so the execution can | |
3805 | * continue normally. | |
3806 | */ | |
3807 | pthread_mutex_unlock(&ua_sess->lock); | |
3808 | goto end; | |
ffe60014 | 3809 | } |
d0b96690 | 3810 | goto error_unlock; |
421cb601 | 3811 | } |
5b4a0ec0 | 3812 | |
55c3953d DG |
3813 | /* Indicate that the session has been started once */ |
3814 | ua_sess->started = 1; | |
3815 | ||
d0b96690 DG |
3816 | pthread_mutex_unlock(&ua_sess->lock); |
3817 | ||
840cb59c | 3818 | health_code_update(); |
86acf0da | 3819 | |
421cb601 | 3820 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3821 | ret = ustctl_wait_quiescent(app->sock); |
3822 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3823 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3824 | app->pid, ret); | |
3825 | } | |
48842b30 | 3826 | |
e0c7ec2b DG |
3827 | end: |
3828 | rcu_read_unlock(); | |
840cb59c | 3829 | health_code_update(); |
421cb601 | 3830 | return 0; |
48842b30 | 3831 | |
d0b96690 DG |
3832 | error_unlock: |
3833 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3834 | rcu_read_unlock(); |
840cb59c | 3835 | health_code_update(); |
421cb601 DG |
3836 | return -1; |
3837 | } | |
48842b30 | 3838 | |
8be98f9a MD |
3839 | /* |
3840 | * Stop tracing for a specific UST session and app. | |
3841 | */ | |
b34cbebf | 3842 | static |
8be98f9a MD |
3843 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3844 | { | |
3845 | int ret = 0; | |
3846 | struct ust_app_session *ua_sess; | |
7972aab2 | 3847 | struct ust_registry_session *registry; |
8be98f9a | 3848 | |
852d0037 | 3849 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3850 | |
3851 | rcu_read_lock(); | |
3852 | ||
e0c7ec2b | 3853 | if (!app->compatible) { |
d88aee68 | 3854 | goto end_no_session; |
e0c7ec2b DG |
3855 | } |
3856 | ||
8be98f9a MD |
3857 | ua_sess = lookup_session_by_app(usess, app); |
3858 | if (ua_sess == NULL) { | |
d88aee68 | 3859 | goto end_no_session; |
8be98f9a MD |
3860 | } |
3861 | ||
d88aee68 DG |
3862 | pthread_mutex_lock(&ua_sess->lock); |
3863 | ||
9bc07046 DG |
3864 | /* |
3865 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3866 | * that was never started. It's possible since we can have a fail start |
3867 | * from either the application manager thread or the command thread. Simply | |
3868 | * indicate that this is a stop error. | |
9bc07046 | 3869 | */ |
f9dfc3d9 | 3870 | if (!ua_sess->started) { |
c45536e1 DG |
3871 | goto error_rcu_unlock; |
3872 | } | |
7db205b5 | 3873 | |
840cb59c | 3874 | health_code_update(); |
86acf0da | 3875 | |
9d6c7d3f | 3876 | /* This inhibits UST tracing */ |
852d0037 | 3877 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3878 | if (ret < 0) { |
ffe60014 DG |
3879 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3880 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3881 | app->pid, ret); | |
3882 | } else { | |
3883 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
3884 | /* |
3885 | * This is normal behavior, an application can die during the | |
3886 | * creation process. Don't report an error so the execution can | |
3887 | * continue normally. | |
3888 | */ | |
3889 | goto end_unlock; | |
ffe60014 | 3890 | } |
9d6c7d3f DG |
3891 | goto error_rcu_unlock; |
3892 | } | |
3893 | ||
840cb59c | 3894 | health_code_update(); |
86acf0da | 3895 | |
9d6c7d3f | 3896 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3897 | ret = ustctl_wait_quiescent(app->sock); |
3898 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3899 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3900 | app->pid, ret); | |
3901 | } | |
9d6c7d3f | 3902 | |
840cb59c | 3903 | health_code_update(); |
86acf0da | 3904 | |
b34cbebf MD |
3905 | registry = get_session_registry(ua_sess); |
3906 | assert(registry); | |
1b532a60 DG |
3907 | |
3908 | if (!registry->metadata_closed) { | |
3909 | /* Push metadata for application before freeing the application. */ | |
3910 | (void) push_metadata(registry, ua_sess->consumer); | |
3911 | } | |
b34cbebf | 3912 | |
3757b385 | 3913 | end_unlock: |
b34cbebf MD |
3914 | pthread_mutex_unlock(&ua_sess->lock); |
3915 | end_no_session: | |
3916 | rcu_read_unlock(); | |
3917 | health_code_update(); | |
3918 | return 0; | |
3919 | ||
3920 | error_rcu_unlock: | |
3921 | pthread_mutex_unlock(&ua_sess->lock); | |
3922 | rcu_read_unlock(); | |
3923 | health_code_update(); | |
3924 | return -1; | |
3925 | } | |
3926 | ||
3927 | /* | |
3928 | * Flush buffers for a specific UST session and app. | |
3929 | */ | |
3930 | static | |
3931 | int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
3932 | { | |
3933 | int ret = 0; | |
3934 | struct lttng_ht_iter iter; | |
3935 | struct ust_app_session *ua_sess; | |
3936 | struct ust_app_channel *ua_chan; | |
3937 | ||
3938 | DBG("Flushing buffers for ust app pid %d", app->pid); | |
3939 | ||
3940 | rcu_read_lock(); | |
3941 | ||
3942 | if (!app->compatible) { | |
3943 | goto end_no_session; | |
3944 | } | |
3945 | ||
3946 | ua_sess = lookup_session_by_app(usess, app); | |
3947 | if (ua_sess == NULL) { | |
3948 | goto end_no_session; | |
3949 | } | |
3950 | ||
3951 | pthread_mutex_lock(&ua_sess->lock); | |
3952 | ||
3953 | health_code_update(); | |
3954 | ||
9d6c7d3f | 3955 | /* Flushing buffers */ |
bec39940 DG |
3956 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
3957 | node.node) { | |
840cb59c | 3958 | health_code_update(); |
ffe60014 | 3959 | assert(ua_chan->is_sent); |
852d0037 | 3960 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 3961 | if (ret < 0) { |
ffe60014 DG |
3962 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3963 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
3964 | app->pid, ua_chan->name, ret); | |
3965 | } else { | |
3966 | DBG3("UST app failed to flush %s. Application is dead.", | |
3967 | ua_chan->name); | |
3757b385 DG |
3968 | /* |
3969 | * This is normal behavior, an application can die during the | |
3970 | * creation process. Don't report an error so the execution can | |
3971 | * continue normally. | |
3972 | */ | |
ffe60014 | 3973 | } |
6d3686da DG |
3974 | /* Continuing flushing all buffers */ |
3975 | continue; | |
8be98f9a MD |
3976 | } |
3977 | } | |
8be98f9a | 3978 | |
840cb59c | 3979 | health_code_update(); |
86acf0da | 3980 | |
d88aee68 DG |
3981 | pthread_mutex_unlock(&ua_sess->lock); |
3982 | end_no_session: | |
7db205b5 | 3983 | rcu_read_unlock(); |
840cb59c | 3984 | health_code_update(); |
8be98f9a | 3985 | return 0; |
8be98f9a MD |
3986 | } |
3987 | ||
84cd17c6 MD |
3988 | /* |
3989 | * Destroy a specific UST session in apps. | |
3990 | */ | |
3353de95 | 3991 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 3992 | { |
ffe60014 | 3993 | int ret; |
84cd17c6 | 3994 | struct ust_app_session *ua_sess; |
bec39940 | 3995 | struct lttng_ht_iter iter; |
d9bf3ca4 | 3996 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 3997 | |
852d0037 | 3998 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
3999 | |
4000 | rcu_read_lock(); | |
4001 | ||
e0c7ec2b DG |
4002 | if (!app->compatible) { |
4003 | goto end; | |
4004 | } | |
4005 | ||
84cd17c6 | 4006 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4007 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4008 | if (node == NULL) { |
d42f20df DG |
4009 | /* Session is being or is deleted. */ |
4010 | goto end; | |
84cd17c6 MD |
4011 | } |
4012 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4013 | |
840cb59c | 4014 | health_code_update(); |
d0b96690 | 4015 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4016 | |
840cb59c | 4017 | health_code_update(); |
7db205b5 | 4018 | |
84cd17c6 | 4019 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4020 | ret = ustctl_wait_quiescent(app->sock); |
4021 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4022 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4023 | app->pid, ret); | |
4024 | } | |
e0c7ec2b DG |
4025 | end: |
4026 | rcu_read_unlock(); | |
840cb59c | 4027 | health_code_update(); |
84cd17c6 | 4028 | return 0; |
84cd17c6 MD |
4029 | } |
4030 | ||
5b4a0ec0 DG |
4031 | /* |
4032 | * Start tracing for the UST session. | |
4033 | */ | |
421cb601 DG |
4034 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4035 | { | |
4036 | int ret = 0; | |
bec39940 | 4037 | struct lttng_ht_iter iter; |
421cb601 | 4038 | struct ust_app *app; |
48842b30 | 4039 | |
421cb601 DG |
4040 | DBG("Starting all UST traces"); |
4041 | ||
4042 | rcu_read_lock(); | |
421cb601 | 4043 | |
852d0037 | 4044 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4045 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4046 | if (ret < 0) { |
5b4a0ec0 DG |
4047 | /* Continue to next apps even on error */ |
4048 | continue; | |
48842b30 | 4049 | } |
48842b30 | 4050 | } |
5b4a0ec0 | 4051 | |
48842b30 DG |
4052 | rcu_read_unlock(); |
4053 | ||
4054 | return 0; | |
4055 | } | |
487cf67c | 4056 | |
8be98f9a MD |
4057 | /* |
4058 | * Start tracing for the UST session. | |
4059 | */ | |
4060 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4061 | { | |
4062 | int ret = 0; | |
bec39940 | 4063 | struct lttng_ht_iter iter; |
8be98f9a MD |
4064 | struct ust_app *app; |
4065 | ||
4066 | DBG("Stopping all UST traces"); | |
4067 | ||
4068 | rcu_read_lock(); | |
4069 | ||
b34cbebf MD |
4070 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4071 | ret = ust_app_stop_trace(usess, app); | |
4072 | if (ret < 0) { | |
4073 | /* Continue to next apps even on error */ | |
4074 | continue; | |
4075 | } | |
4076 | } | |
4077 | ||
b0a5f0fb | 4078 | /* Flush buffers and push metadata (for UID buffers). */ |
b34cbebf MD |
4079 | switch (usess->buffer_type) { |
4080 | case LTTNG_BUFFER_PER_UID: | |
4081 | { | |
7972aab2 | 4082 | struct buffer_reg_uid *reg; |
b34cbebf MD |
4083 | |
4084 | /* Flush all per UID buffers associated to that session. */ | |
7972aab2 | 4085 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
b0a5f0fb | 4086 | struct ust_registry_session *ust_session_reg; |
7972aab2 DG |
4087 | struct buffer_reg_channel *reg_chan; |
4088 | struct consumer_socket *socket; | |
4089 | ||
4090 | /* Get consumer socket to use to push the metadata.*/ | |
4091 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4092 | usess->consumer); | |
4093 | if (!socket) { | |
4094 | /* Ignore request if no consumer is found for the session. */ | |
4095 | continue; | |
4096 | } | |
4097 | ||
4098 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4099 | reg_chan, node.node) { | |
4100 | /* | |
4101 | * The following call will print error values so the return | |
4102 | * code is of little importance because whatever happens, we | |
4103 | * have to try them all. | |
4104 | */ | |
4105 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4106 | } | |
b0a5f0fb MD |
4107 | |
4108 | ust_session_reg = reg->registry->reg.ust; | |
4109 | if (!ust_session_reg->metadata_closed) { | |
4110 | /* Push metadata. */ | |
4111 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4112 | } | |
7972aab2 | 4113 | } |
b0a5f0fb | 4114 | |
b34cbebf | 4115 | break; |
7972aab2 | 4116 | } |
b34cbebf MD |
4117 | case LTTNG_BUFFER_PER_PID: |
4118 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4119 | ret = ust_app_flush_trace(usess, app); | |
4120 | if (ret < 0) { | |
4121 | /* Continue to next apps even on error */ | |
4122 | continue; | |
4123 | } | |
8be98f9a | 4124 | } |
b34cbebf MD |
4125 | break; |
4126 | default: | |
4127 | assert(0); | |
4128 | break; | |
8be98f9a MD |
4129 | } |
4130 | ||
4131 | rcu_read_unlock(); | |
4132 | ||
4133 | return 0; | |
4134 | } | |
4135 | ||
84cd17c6 MD |
4136 | /* |
4137 | * Destroy app UST session. | |
4138 | */ | |
4139 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4140 | { | |
4141 | int ret = 0; | |
bec39940 | 4142 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4143 | struct ust_app *app; |
4144 | ||
4145 | DBG("Destroy all UST traces"); | |
4146 | ||
4147 | rcu_read_lock(); | |
4148 | ||
852d0037 | 4149 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4150 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4151 | if (ret < 0) { |
4152 | /* Continue to next apps even on error */ | |
4153 | continue; | |
4154 | } | |
4155 | } | |
4156 | ||
4157 | rcu_read_unlock(); | |
4158 | ||
4159 | return 0; | |
4160 | } | |
4161 | ||
5b4a0ec0 DG |
4162 | /* |
4163 | * Add channels/events from UST global domain to registered apps at sock. | |
4164 | */ | |
487cf67c DG |
4165 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4166 | { | |
55c54cce | 4167 | int ret = 0; |
31746f93 | 4168 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4169 | struct ust_app *app; |
3d8ca23b | 4170 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4171 | struct ust_app_channel *ua_chan; |
4172 | struct ust_app_event *ua_event; | |
727d5404 | 4173 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4174 | |
95e047ff | 4175 | assert(usess); |
ffe60014 | 4176 | assert(sock >= 0); |
1f3580c7 | 4177 | |
d9bf3ca4 | 4178 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4179 | usess->id); |
487cf67c | 4180 | |
284d8f55 DG |
4181 | rcu_read_lock(); |
4182 | ||
f20baf8e | 4183 | app = ust_app_find_by_sock(sock); |
487cf67c | 4184 | if (app == NULL) { |
d88aee68 DG |
4185 | /* |
4186 | * Application can be unregistered before so this is possible hence | |
4187 | * simply stopping the update. | |
4188 | */ | |
4189 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4190 | goto error; |
4191 | } | |
4192 | ||
e0c7ec2b DG |
4193 | if (!app->compatible) { |
4194 | goto error; | |
4195 | } | |
4196 | ||
3d8ca23b DG |
4197 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4198 | if (ret < 0) { | |
4199 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4200 | goto error; |
4201 | } | |
3d8ca23b | 4202 | assert(ua_sess); |
487cf67c | 4203 | |
d0b96690 DG |
4204 | pthread_mutex_lock(&ua_sess->lock); |
4205 | ||
284d8f55 | 4206 | /* |
d0b96690 | 4207 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4208 | * app session above made a shadow copy of the UST global domain from the |
4209 | * ltt ust session. | |
4210 | */ | |
bec39940 DG |
4211 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4212 | node.node) { | |
ad7a9107 DG |
4213 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
4214 | if (ret < 0) { | |
4215 | /* | |
4216 | * Stop everything. On error, the application failed, no more | |
4217 | * file descriptor are available or ENOMEM so stopping here is | |
4218 | * the only thing we can do for now. | |
4219 | */ | |
4220 | goto error_unlock; | |
487cf67c DG |
4221 | } |
4222 | ||
31746f93 DG |
4223 | /* |
4224 | * Add context using the list so they are enabled in the same order the | |
4225 | * user added them. | |
4226 | */ | |
4227 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4228 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4229 | if (ret < 0) { | |
d0b96690 | 4230 | goto error_unlock; |
727d5404 DG |
4231 | } |
4232 | } | |
4233 | ||
4234 | ||
284d8f55 | 4235 | /* For each events */ |
bec39940 DG |
4236 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4237 | node.node) { | |
284d8f55 DG |
4238 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4239 | if (ret < 0) { | |
d0b96690 | 4240 | goto error_unlock; |
487cf67c | 4241 | } |
36dc12cc | 4242 | } |
487cf67c DG |
4243 | } |
4244 | ||
d0b96690 DG |
4245 | pthread_mutex_unlock(&ua_sess->lock); |
4246 | ||
36dc12cc | 4247 | if (usess->start_trace) { |
421cb601 | 4248 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4249 | if (ret < 0) { |
36dc12cc DG |
4250 | goto error; |
4251 | } | |
4252 | ||
852d0037 | 4253 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4254 | } |
4255 | ||
ffe60014 DG |
4256 | /* Everything went well at this point. */ |
4257 | rcu_read_unlock(); | |
4258 | return; | |
4259 | ||
d0b96690 DG |
4260 | error_unlock: |
4261 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4262 | error: |
ffe60014 | 4263 | if (ua_sess) { |
d0b96690 | 4264 | destroy_app_session(app, ua_sess); |
ffe60014 | 4265 | } |
487cf67c DG |
4266 | rcu_read_unlock(); |
4267 | return; | |
4268 | } | |
55cc08a6 DG |
4269 | |
4270 | /* | |
4271 | * Add context to a specific channel for global UST domain. | |
4272 | */ | |
4273 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4274 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4275 | { | |
4276 | int ret = 0; | |
bec39940 DG |
4277 | struct lttng_ht_node_str *ua_chan_node; |
4278 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4279 | struct ust_app_channel *ua_chan = NULL; |
4280 | struct ust_app_session *ua_sess; | |
4281 | struct ust_app *app; | |
4282 | ||
4283 | rcu_read_lock(); | |
4284 | ||
852d0037 | 4285 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4286 | if (!app->compatible) { |
4287 | /* | |
4288 | * TODO: In time, we should notice the caller of this error by | |
4289 | * telling him that this is a version error. | |
4290 | */ | |
4291 | continue; | |
4292 | } | |
55cc08a6 DG |
4293 | ua_sess = lookup_session_by_app(usess, app); |
4294 | if (ua_sess == NULL) { | |
4295 | continue; | |
4296 | } | |
4297 | ||
d0b96690 | 4298 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4299 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4300 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4301 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4302 | if (ua_chan_node == NULL) { |
d0b96690 | 4303 | goto next_app; |
55cc08a6 DG |
4304 | } |
4305 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4306 | node); | |
55cc08a6 DG |
4307 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4308 | if (ret < 0) { | |
d0b96690 | 4309 | goto next_app; |
55cc08a6 | 4310 | } |
d0b96690 DG |
4311 | next_app: |
4312 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4313 | } |
4314 | ||
55cc08a6 DG |
4315 | rcu_read_unlock(); |
4316 | return ret; | |
4317 | } | |
4318 | ||
76d45b40 DG |
4319 | /* |
4320 | * Enable event for a channel from a UST session for a specific PID. | |
4321 | */ | |
4322 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4323 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4324 | { | |
4325 | int ret = 0; | |
bec39940 | 4326 | struct lttng_ht_iter iter; |
18eace3b | 4327 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4328 | struct ust_app *app; |
4329 | struct ust_app_session *ua_sess; | |
4330 | struct ust_app_channel *ua_chan; | |
4331 | struct ust_app_event *ua_event; | |
4332 | ||
4333 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4334 | ||
4335 | rcu_read_lock(); | |
4336 | ||
4337 | app = ust_app_find_by_pid(pid); | |
4338 | if (app == NULL) { | |
4339 | ERR("UST app enable event per PID %d not found", pid); | |
4340 | ret = -1; | |
d0b96690 | 4341 | goto end; |
76d45b40 DG |
4342 | } |
4343 | ||
e0c7ec2b DG |
4344 | if (!app->compatible) { |
4345 | ret = 0; | |
d0b96690 | 4346 | goto end; |
e0c7ec2b DG |
4347 | } |
4348 | ||
76d45b40 | 4349 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4350 | if (!ua_sess) { |
4351 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4352 | ret = 0; |
4353 | goto end; | |
c4a1715b | 4354 | } |
76d45b40 | 4355 | |
d0b96690 | 4356 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4357 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4358 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4359 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4360 | /* If the channel is not found, there is a code flow error */ |
4361 | assert(ua_chan_node); | |
4362 | ||
4363 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4364 | ||
18eace3b | 4365 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 4366 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4367 | if (ua_event == NULL) { |
76d45b40 DG |
4368 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4369 | if (ret < 0) { | |
d0b96690 | 4370 | goto end_unlock; |
76d45b40 DG |
4371 | } |
4372 | } else { | |
76d45b40 DG |
4373 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4374 | if (ret < 0) { | |
d0b96690 | 4375 | goto end_unlock; |
76d45b40 DG |
4376 | } |
4377 | } | |
4378 | ||
d0b96690 DG |
4379 | end_unlock: |
4380 | pthread_mutex_unlock(&ua_sess->lock); | |
4381 | end: | |
76d45b40 DG |
4382 | rcu_read_unlock(); |
4383 | return ret; | |
4384 | } | |
7f79d3a1 | 4385 | |
4466912f DG |
4386 | /* |
4387 | * Calibrate registered applications. | |
4388 | */ | |
4389 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4390 | { | |
4391 | int ret = 0; | |
4392 | struct lttng_ht_iter iter; | |
4393 | struct ust_app *app; | |
4394 | ||
4395 | rcu_read_lock(); | |
4396 | ||
852d0037 | 4397 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4398 | if (!app->compatible) { |
4399 | /* | |
4400 | * TODO: In time, we should notice the caller of this error by | |
4401 | * telling him that this is a version error. | |
4402 | */ | |
4403 | continue; | |
4404 | } | |
4405 | ||
840cb59c | 4406 | health_code_update(); |
86acf0da | 4407 | |
852d0037 | 4408 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4409 | if (ret < 0) { |
4410 | switch (ret) { | |
4411 | case -ENOSYS: | |
4412 | /* Means that it's not implemented on the tracer side. */ | |
4413 | ret = 0; | |
4414 | break; | |
4415 | default: | |
4466912f | 4416 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4417 | app->pid, ret); |
4466912f DG |
4418 | break; |
4419 | } | |
4420 | } | |
4421 | } | |
4422 | ||
4423 | DBG("UST app global domain calibration finished"); | |
4424 | ||
4425 | rcu_read_unlock(); | |
4426 | ||
840cb59c | 4427 | health_code_update(); |
86acf0da | 4428 | |
4466912f DG |
4429 | return ret; |
4430 | } | |
d0b96690 DG |
4431 | |
4432 | /* | |
4433 | * Receive registration and populate the given msg structure. | |
4434 | * | |
4435 | * On success return 0 else a negative value returned by the ustctl call. | |
4436 | */ | |
4437 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4438 | { | |
4439 | int ret; | |
4440 | uint32_t pid, ppid, uid, gid; | |
4441 | ||
4442 | assert(msg); | |
4443 | ||
4444 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4445 | &pid, &ppid, &uid, &gid, | |
4446 | &msg->bits_per_long, | |
4447 | &msg->uint8_t_alignment, | |
4448 | &msg->uint16_t_alignment, | |
4449 | &msg->uint32_t_alignment, | |
4450 | &msg->uint64_t_alignment, | |
4451 | &msg->long_alignment, | |
4452 | &msg->byte_order, | |
4453 | msg->name); | |
4454 | if (ret < 0) { | |
4455 | switch (-ret) { | |
4456 | case EPIPE: | |
4457 | case ECONNRESET: | |
4458 | case LTTNG_UST_ERR_EXITING: | |
4459 | DBG3("UST app recv reg message failed. Application died"); | |
4460 | break; | |
4461 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4462 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4463 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4464 | LTTNG_UST_ABI_MINOR_VERSION); | |
4465 | break; | |
4466 | default: | |
4467 | ERR("UST app recv reg message failed with ret %d", ret); | |
4468 | break; | |
4469 | } | |
4470 | goto error; | |
4471 | } | |
4472 | msg->pid = (pid_t) pid; | |
4473 | msg->ppid = (pid_t) ppid; | |
4474 | msg->uid = (uid_t) uid; | |
4475 | msg->gid = (gid_t) gid; | |
4476 | ||
4477 | error: | |
4478 | return ret; | |
4479 | } | |
4480 | ||
d88aee68 DG |
4481 | /* |
4482 | * Return a ust app channel object using the application object and the channel | |
4483 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4484 | * lock MUST be acquired before calling this function. | |
4485 | */ | |
d0b96690 DG |
4486 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4487 | int objd) | |
4488 | { | |
4489 | struct lttng_ht_node_ulong *node; | |
4490 | struct lttng_ht_iter iter; | |
4491 | struct ust_app_channel *ua_chan = NULL; | |
4492 | ||
4493 | assert(app); | |
4494 | ||
4495 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4496 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4497 | if (node == NULL) { | |
4498 | DBG2("UST app channel find by objd %d not found", objd); | |
4499 | goto error; | |
4500 | } | |
4501 | ||
4502 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4503 | ||
4504 | error: | |
4505 | return ua_chan; | |
4506 | } | |
4507 | ||
d88aee68 DG |
4508 | /* |
4509 | * Reply to a register channel notification from an application on the notify | |
4510 | * socket. The channel metadata is also created. | |
4511 | * | |
4512 | * The session UST registry lock is acquired in this function. | |
4513 | * | |
4514 | * On success 0 is returned else a negative value. | |
4515 | */ | |
d0b96690 DG |
4516 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4517 | size_t nr_fields, struct ustctl_field *fields) | |
4518 | { | |
4519 | int ret, ret_code = 0; | |
4520 | uint32_t chan_id, reg_count; | |
7972aab2 | 4521 | uint64_t chan_reg_key; |
d0b96690 DG |
4522 | enum ustctl_channel_header type; |
4523 | struct ust_app *app; | |
4524 | struct ust_app_channel *ua_chan; | |
4525 | struct ust_app_session *ua_sess; | |
7972aab2 | 4526 | struct ust_registry_session *registry; |
45893984 | 4527 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4528 | |
4529 | rcu_read_lock(); | |
4530 | ||
4531 | /* Lookup application. If not found, there is a code flow error. */ | |
4532 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4533 | if (!app) { |
4534 | DBG("Application socket %d is being teardown. Abort event notify", | |
4535 | sock); | |
4536 | ret = 0; | |
d5d629b5 | 4537 | free(fields); |
d88aee68 DG |
4538 | goto error_rcu_unlock; |
4539 | } | |
d0b96690 | 4540 | |
4950b860 | 4541 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4542 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4543 | if (!ua_chan) { |
4544 | DBG("Application channel is being teardown. Abort event notify"); | |
4545 | ret = 0; | |
d5d629b5 | 4546 | free(fields); |
4950b860 MD |
4547 | goto error_rcu_unlock; |
4548 | } | |
4549 | ||
d0b96690 DG |
4550 | assert(ua_chan->session); |
4551 | ua_sess = ua_chan->session; | |
d0b96690 | 4552 | |
7972aab2 DG |
4553 | /* Get right session registry depending on the session buffer type. */ |
4554 | registry = get_session_registry(ua_sess); | |
4555 | assert(registry); | |
45893984 | 4556 | |
7972aab2 DG |
4557 | /* Depending on the buffer type, a different channel key is used. */ |
4558 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4559 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4560 | } else { |
7972aab2 | 4561 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4562 | } |
4563 | ||
7972aab2 DG |
4564 | pthread_mutex_lock(®istry->lock); |
4565 | ||
4566 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4567 | assert(chan_reg); | |
4568 | ||
4569 | if (!chan_reg->register_done) { | |
4570 | reg_count = ust_registry_get_event_count(chan_reg); | |
4571 | if (reg_count < 31) { | |
4572 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4573 | } else { | |
4574 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4575 | } | |
4576 | ||
4577 | chan_reg->nr_ctx_fields = nr_fields; | |
4578 | chan_reg->ctx_fields = fields; | |
4579 | chan_reg->header_type = type; | |
d0b96690 | 4580 | } else { |
7972aab2 DG |
4581 | /* Get current already assigned values. */ |
4582 | type = chan_reg->header_type; | |
d5d629b5 DG |
4583 | free(fields); |
4584 | /* Set to NULL so the error path does not do a double free. */ | |
4585 | fields = NULL; | |
d0b96690 | 4586 | } |
7972aab2 DG |
4587 | /* Channel id is set during the object creation. */ |
4588 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4589 | |
4590 | /* Append to metadata */ | |
7972aab2 DG |
4591 | if (!chan_reg->metadata_dumped) { |
4592 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4593 | if (ret_code) { |
4594 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4595 | goto reply; | |
4596 | } | |
4597 | } | |
4598 | ||
4599 | reply: | |
7972aab2 DG |
4600 | DBG3("UST app replying to register channel key %" PRIu64 |
4601 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4602 | ret_code); | |
d0b96690 DG |
4603 | |
4604 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4605 | if (ret < 0) { | |
4606 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4607 | ERR("UST app reply channel failed with ret %d", ret); | |
4608 | } else { | |
4609 | DBG3("UST app reply channel failed. Application died"); | |
4610 | } | |
4611 | goto error; | |
4612 | } | |
4613 | ||
7972aab2 DG |
4614 | /* This channel registry registration is completed. */ |
4615 | chan_reg->register_done = 1; | |
4616 | ||
d0b96690 | 4617 | error: |
7972aab2 | 4618 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4619 | error_rcu_unlock: |
d0b96690 | 4620 | rcu_read_unlock(); |
d5d629b5 DG |
4621 | if (ret) { |
4622 | free(fields); | |
4623 | } | |
d0b96690 DG |
4624 | return ret; |
4625 | } | |
4626 | ||
d88aee68 DG |
4627 | /* |
4628 | * Add event to the UST channel registry. When the event is added to the | |
4629 | * registry, the metadata is also created. Once done, this replies to the | |
4630 | * application with the appropriate error code. | |
4631 | * | |
4632 | * The session UST registry lock is acquired in the function. | |
4633 | * | |
4634 | * On success 0 is returned else a negative value. | |
4635 | */ | |
d0b96690 DG |
4636 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4637 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4638 | char *model_emf_uri) | |
4639 | { | |
4640 | int ret, ret_code; | |
4641 | uint32_t event_id = 0; | |
7972aab2 | 4642 | uint64_t chan_reg_key; |
d0b96690 DG |
4643 | struct ust_app *app; |
4644 | struct ust_app_channel *ua_chan; | |
4645 | struct ust_app_session *ua_sess; | |
7972aab2 | 4646 | struct ust_registry_session *registry; |
d0b96690 DG |
4647 | |
4648 | rcu_read_lock(); | |
4649 | ||
4650 | /* Lookup application. If not found, there is a code flow error. */ | |
4651 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4652 | if (!app) { |
4653 | DBG("Application socket %d is being teardown. Abort event notify", | |
4654 | sock); | |
4655 | ret = 0; | |
d5d629b5 DG |
4656 | free(sig); |
4657 | free(fields); | |
4658 | free(model_emf_uri); | |
d88aee68 DG |
4659 | goto error_rcu_unlock; |
4660 | } | |
d0b96690 | 4661 | |
4950b860 | 4662 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4663 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4664 | if (!ua_chan) { |
4665 | DBG("Application channel is being teardown. Abort event notify"); | |
4666 | ret = 0; | |
d5d629b5 DG |
4667 | free(sig); |
4668 | free(fields); | |
4669 | free(model_emf_uri); | |
4950b860 MD |
4670 | goto error_rcu_unlock; |
4671 | } | |
4672 | ||
d0b96690 DG |
4673 | assert(ua_chan->session); |
4674 | ua_sess = ua_chan->session; | |
4675 | ||
7972aab2 DG |
4676 | registry = get_session_registry(ua_sess); |
4677 | assert(registry); | |
4678 | ||
4679 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4680 | chan_reg_key = ua_chan->tracing_channel_id; | |
4681 | } else { | |
4682 | chan_reg_key = ua_chan->key; | |
4683 | } | |
4684 | ||
4685 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4686 | |
d5d629b5 DG |
4687 | /* |
4688 | * From this point on, this call acquires the ownership of the sig, fields | |
4689 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4690 | * three variables MUST NOT be read/write after this. | |
4691 | */ | |
7972aab2 | 4692 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4693 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
8494bda5 MD |
4694 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4695 | app); | |
d0b96690 DG |
4696 | |
4697 | /* | |
4698 | * The return value is returned to ustctl so in case of an error, the | |
4699 | * application can be notified. In case of an error, it's important not to | |
4700 | * return a negative error or else the application will get closed. | |
4701 | */ | |
4702 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4703 | if (ret < 0) { | |
4704 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4705 | ERR("UST app reply event failed with ret %d", ret); | |
4706 | } else { | |
4707 | DBG3("UST app reply event failed. Application died"); | |
4708 | } | |
4709 | /* | |
4710 | * No need to wipe the create event since the application socket will | |
4711 | * get close on error hence cleaning up everything by itself. | |
4712 | */ | |
4713 | goto error; | |
4714 | } | |
4715 | ||
7972aab2 DG |
4716 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4717 | name, event_id); | |
d88aee68 | 4718 | |
d0b96690 | 4719 | error: |
7972aab2 | 4720 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4721 | error_rcu_unlock: |
d0b96690 DG |
4722 | rcu_read_unlock(); |
4723 | return ret; | |
4724 | } | |
4725 | ||
d88aee68 DG |
4726 | /* |
4727 | * Handle application notification through the given notify socket. | |
4728 | * | |
4729 | * Return 0 on success or else a negative value. | |
4730 | */ | |
d0b96690 DG |
4731 | int ust_app_recv_notify(int sock) |
4732 | { | |
4733 | int ret; | |
4734 | enum ustctl_notify_cmd cmd; | |
4735 | ||
4736 | DBG3("UST app receiving notify from sock %d", sock); | |
4737 | ||
4738 | ret = ustctl_recv_notify(sock, &cmd); | |
4739 | if (ret < 0) { | |
4740 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4741 | ERR("UST app recv notify failed with ret %d", ret); | |
4742 | } else { | |
4743 | DBG3("UST app recv notify failed. Application died"); | |
4744 | } | |
4745 | goto error; | |
4746 | } | |
4747 | ||
4748 | switch (cmd) { | |
4749 | case USTCTL_NOTIFY_CMD_EVENT: | |
4750 | { | |
4751 | int sobjd, cobjd, loglevel; | |
4752 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4753 | size_t nr_fields; | |
4754 | struct ustctl_field *fields; | |
4755 | ||
4756 | DBG2("UST app ustctl register event received"); | |
4757 | ||
4758 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4759 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4760 | if (ret < 0) { | |
4761 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4762 | ERR("UST app recv event failed with ret %d", ret); | |
4763 | } else { | |
4764 | DBG3("UST app recv event failed. Application died"); | |
4765 | } | |
4766 | goto error; | |
4767 | } | |
4768 | ||
d5d629b5 DG |
4769 | /* |
4770 | * Add event to the UST registry coming from the notify socket. This | |
4771 | * call will free if needed the sig, fields and model_emf_uri. This | |
4772 | * code path loses the ownsership of these variables and transfer them | |
4773 | * to the this function. | |
4774 | */ | |
d0b96690 DG |
4775 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4776 | fields, loglevel, model_emf_uri); | |
4777 | if (ret < 0) { | |
4778 | goto error; | |
4779 | } | |
4780 | ||
4781 | break; | |
4782 | } | |
4783 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4784 | { | |
4785 | int sobjd, cobjd; | |
4786 | size_t nr_fields; | |
4787 | struct ustctl_field *fields; | |
4788 | ||
4789 | DBG2("UST app ustctl register channel received"); | |
4790 | ||
4791 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4792 | &fields); | |
4793 | if (ret < 0) { | |
4794 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4795 | ERR("UST app recv channel failed with ret %d", ret); | |
4796 | } else { | |
4797 | DBG3("UST app recv channel failed. Application died"); | |
4798 | } | |
4799 | goto error; | |
4800 | } | |
4801 | ||
d5d629b5 DG |
4802 | /* |
4803 | * The fields ownership are transfered to this function call meaning | |
4804 | * that if needed it will be freed. After this, it's invalid to access | |
4805 | * fields or clean it up. | |
4806 | */ | |
d0b96690 DG |
4807 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4808 | fields); | |
4809 | if (ret < 0) { | |
4810 | goto error; | |
4811 | } | |
4812 | ||
4813 | break; | |
4814 | } | |
4815 | default: | |
4816 | /* Should NEVER happen. */ | |
4817 | assert(0); | |
4818 | } | |
4819 | ||
4820 | error: | |
4821 | return ret; | |
4822 | } | |
d88aee68 DG |
4823 | |
4824 | /* | |
4825 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4826 | * corresponding application. On failure, the call_rcu to close the socket is | |
4827 | * executed. If an application is found, it tries to delete it from the notify | |
4828 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4829 | * | |
4830 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4831 | * call RCU is not done but the rest of the cleanup is. | |
4832 | */ | |
4833 | void ust_app_notify_sock_unregister(int sock) | |
4834 | { | |
4835 | int err_enomem = 0; | |
4836 | struct lttng_ht_iter iter; | |
4837 | struct ust_app *app; | |
4838 | struct ust_app_notify_sock_obj *obj; | |
4839 | ||
4840 | assert(sock >= 0); | |
4841 | ||
4842 | rcu_read_lock(); | |
4843 | ||
4844 | obj = zmalloc(sizeof(*obj)); | |
4845 | if (!obj) { | |
4846 | /* | |
4847 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4848 | * procedure but the call_rcu will not be called. In this case, we | |
4849 | * accept the fd leak rather than possibly creating an unsynchronized | |
4850 | * state between threads. | |
4851 | * | |
4852 | * TODO: The notify object should be created once the notify socket is | |
4853 | * registered and stored independantely from the ust app object. The | |
4854 | * tricky part is to synchronize the teardown of the application and | |
4855 | * this notify object. Let's keep that in mind so we can avoid this | |
4856 | * kind of shenanigans with ENOMEM in the teardown path. | |
4857 | */ | |
4858 | err_enomem = 1; | |
4859 | } else { | |
4860 | obj->fd = sock; | |
4861 | } | |
4862 | ||
4863 | DBG("UST app notify socket unregister %d", sock); | |
4864 | ||
4865 | /* | |
4866 | * Lookup application by notify socket. If this fails, this means that the | |
4867 | * hash table delete has already been done by the application | |
4868 | * unregistration process so we can safely close the notify socket in a | |
4869 | * call RCU. | |
4870 | */ | |
4871 | app = find_app_by_notify_sock(sock); | |
4872 | if (!app) { | |
4873 | goto close_socket; | |
4874 | } | |
4875 | ||
4876 | iter.iter.node = &app->notify_sock_n.node; | |
4877 | ||
4878 | /* | |
4879 | * Whatever happens here either we fail or succeed, in both cases we have | |
4880 | * to close the socket after a grace period to continue to the call RCU | |
4881 | * here. If the deletion is successful, the application is not visible | |
4882 | * anymore by other threads and is it fails it means that it was already | |
4883 | * deleted from the hash table so either way we just have to close the | |
4884 | * socket. | |
4885 | */ | |
4886 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4887 | ||
4888 | close_socket: | |
4889 | rcu_read_unlock(); | |
4890 | ||
4891 | /* | |
4892 | * Close socket after a grace period to avoid for the socket to be reused | |
4893 | * before the application object is freed creating potential race between | |
4894 | * threads trying to add unique in the global hash table. | |
4895 | */ | |
4896 | if (!err_enomem) { | |
4897 | call_rcu(&obj->head, close_notify_sock_rcu); | |
4898 | } | |
4899 | } | |
f45e313d DG |
4900 | |
4901 | /* | |
4902 | * Destroy a ust app data structure and free its memory. | |
4903 | */ | |
4904 | void ust_app_destroy(struct ust_app *app) | |
4905 | { | |
4906 | if (!app) { | |
4907 | return; | |
4908 | } | |
4909 | ||
4910 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
4911 | } | |
6dc3064a DG |
4912 | |
4913 | /* | |
4914 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
4915 | * output. | |
4916 | * | |
4917 | * Return 0 on success or else a negative value. | |
4918 | */ | |
4919 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
5c786ded | 4920 | struct snapshot_output *output, int wait, unsigned int nb_streams) |
6dc3064a DG |
4921 | { |
4922 | int ret = 0; | |
7badf927 | 4923 | unsigned int snapshot_done = 0; |
6dc3064a DG |
4924 | struct lttng_ht_iter iter; |
4925 | struct ust_app *app; | |
af706bb7 | 4926 | char pathname[PATH_MAX]; |
5c786ded | 4927 | uint64_t max_stream_size = 0; |
6dc3064a DG |
4928 | |
4929 | assert(usess); | |
4930 | assert(output); | |
4931 | ||
4932 | rcu_read_lock(); | |
4933 | ||
5c786ded JD |
4934 | /* |
4935 | * Compute the maximum size of a single stream if a max size is asked by | |
4936 | * the caller. | |
4937 | */ | |
4938 | if (output->max_size > 0 && nb_streams > 0) { | |
4939 | max_stream_size = output->max_size / nb_streams; | |
4940 | } | |
4941 | ||
8c924c7b MD |
4942 | switch (usess->buffer_type) { |
4943 | case LTTNG_BUFFER_PER_UID: | |
4944 | { | |
4945 | struct buffer_reg_uid *reg; | |
6dc3064a | 4946 | |
8c924c7b MD |
4947 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
4948 | struct buffer_reg_channel *reg_chan; | |
4949 | struct consumer_socket *socket; | |
6dc3064a | 4950 | |
8c924c7b MD |
4951 | /* Get consumer socket to use to push the metadata.*/ |
4952 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4953 | usess->consumer); | |
4954 | if (!socket) { | |
4955 | ret = -EINVAL; | |
4956 | goto error; | |
4957 | } | |
6dc3064a | 4958 | |
8c924c7b MD |
4959 | memset(pathname, 0, sizeof(pathname)); |
4960 | ret = snprintf(pathname, sizeof(pathname), | |
4961 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
4962 | reg->uid, reg->bits_per_long); | |
4963 | if (ret < 0) { | |
4964 | PERROR("snprintf snapshot path"); | |
4965 | goto error; | |
4966 | } | |
4967 | ||
4968 | /* Add the UST default trace dir to path. */ | |
4969 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4970 | reg_chan, node.node) { | |
4971 | ||
4972 | /* | |
4973 | * Make sure the maximum stream size is not lower than the | |
4974 | * subbuffer size or else it's an error since we won't be able to | |
4975 | * snapshot anything. | |
4976 | */ | |
4977 | if (max_stream_size && | |
4978 | reg_chan->subbuf_size > max_stream_size) { | |
4979 | ret = -EINVAL; | |
4980 | DBG3("UST app snapshot record maximum stream size %" PRIu64 | |
6a00837f | 4981 | " is smaller than subbuffer size of %zu", |
8c924c7b MD |
4982 | max_stream_size, reg_chan->subbuf_size); |
4983 | goto error; | |
4984 | } | |
4985 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, output, 0, | |
4986 | usess->uid, usess->gid, pathname, wait, | |
4987 | max_stream_size); | |
4988 | if (ret < 0) { | |
4989 | goto error; | |
4990 | } | |
4991 | } | |
4992 | ret = consumer_snapshot_channel(socket, reg->registry->reg.ust->metadata_key, output, | |
4993 | 1, usess->uid, usess->gid, pathname, wait, | |
4994 | max_stream_size); | |
4995 | if (ret < 0) { | |
4996 | goto error; | |
4997 | } | |
7badf927 | 4998 | snapshot_done = 1; |
af706bb7 | 4999 | } |
8c924c7b MD |
5000 | break; |
5001 | } | |
5002 | case LTTNG_BUFFER_PER_PID: | |
5003 | { | |
5004 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5005 | struct consumer_socket *socket; | |
5006 | struct lttng_ht_iter chan_iter; | |
5007 | struct ust_app_channel *ua_chan; | |
5008 | struct ust_app_session *ua_sess; | |
5009 | struct ust_registry_session *registry; | |
5010 | ||
5011 | ua_sess = lookup_session_by_app(usess, app); | |
5012 | if (!ua_sess) { | |
5013 | /* Session not associated with this app. */ | |
5014 | continue; | |
5015 | } | |
af706bb7 | 5016 | |
8c924c7b MD |
5017 | /* Get the right consumer socket for the application. */ |
5018 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5019 | output->consumer); | |
5020 | if (!socket) { | |
5c786ded | 5021 | ret = -EINVAL; |
5c786ded JD |
5022 | goto error; |
5023 | } | |
5024 | ||
8c924c7b MD |
5025 | /* Add the UST default trace dir to path. */ |
5026 | memset(pathname, 0, sizeof(pathname)); | |
5027 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5028 | ua_sess->path); | |
6dc3064a | 5029 | if (ret < 0) { |
8c924c7b | 5030 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5031 | goto error; |
5032 | } | |
6dc3064a | 5033 | |
8c924c7b MD |
5034 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5035 | ua_chan, node.node) { | |
5036 | /* | |
5037 | * Make sure the maximum stream size is not lower than the | |
5038 | * subbuffer size or else it's an error since we won't be able to | |
5039 | * snapshot anything. | |
5040 | */ | |
5041 | if (max_stream_size && | |
5042 | ua_chan->attr.subbuf_size > max_stream_size) { | |
5043 | ret = -EINVAL; | |
5044 | DBG3("UST app snapshot record maximum stream size %" PRIu64 | |
5045 | " is smaller than subbuffer size of %" PRIu64, | |
5046 | max_stream_size, ua_chan->attr.subbuf_size); | |
5047 | goto error; | |
5048 | } | |
6dc3064a | 5049 | |
8c924c7b MD |
5050 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, 0, |
5051 | ua_sess->euid, ua_sess->egid, pathname, wait, | |
5052 | max_stream_size); | |
5053 | if (ret < 0) { | |
5054 | goto error; | |
5055 | } | |
5056 | } | |
5057 | ||
5058 | registry = get_session_registry(ua_sess); | |
5059 | assert(registry); | |
5060 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
5061 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, | |
5062 | max_stream_size); | |
5063 | if (ret < 0) { | |
5064 | goto error; | |
5065 | } | |
7badf927 | 5066 | snapshot_done = 1; |
8c924c7b MD |
5067 | } |
5068 | break; | |
5069 | } | |
5070 | default: | |
5071 | assert(0); | |
5072 | break; | |
6dc3064a DG |
5073 | } |
5074 | ||
7badf927 DG |
5075 | if (!snapshot_done) { |
5076 | /* | |
5077 | * If no snapshot was made and we are not in the error path, this means | |
5078 | * that there are no buffers thus no (prior) application to snapshot | |
5079 | * data from so we have simply NO data. | |
5080 | */ | |
5081 | ret = -ENODATA; | |
5082 | } | |
5083 | ||
6dc3064a DG |
5084 | error: |
5085 | rcu_read_unlock(); | |
5086 | return ret; | |
5087 | } | |
5c786ded JD |
5088 | |
5089 | /* | |
5090 | * Return the number of streams for a UST session. | |
5091 | */ | |
5092 | unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess) | |
5093 | { | |
5094 | unsigned int ret = 0; | |
5095 | struct ust_app *app; | |
5096 | struct lttng_ht_iter iter; | |
5097 | ||
5098 | assert(usess); | |
5099 | ||
5100 | switch (usess->buffer_type) { | |
5101 | case LTTNG_BUFFER_PER_UID: | |
5102 | { | |
5103 | struct buffer_reg_uid *reg; | |
5104 | ||
5105 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5106 | struct buffer_reg_channel *reg_chan; | |
5107 | ||
5108 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5109 | reg_chan, node.node) { | |
5110 | ret += reg_chan->stream_count; | |
5111 | } | |
5112 | } | |
5113 | break; | |
5114 | } | |
5115 | case LTTNG_BUFFER_PER_PID: | |
5116 | { | |
5117 | rcu_read_lock(); | |
5118 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5119 | struct ust_app_channel *ua_chan; | |
5120 | struct ust_app_session *ua_sess; | |
5121 | struct lttng_ht_iter chan_iter; | |
5122 | ||
5123 | ua_sess = lookup_session_by_app(usess, app); | |
5124 | if (!ua_sess) { | |
5125 | /* Session not associated with this app. */ | |
5126 | continue; | |
5127 | } | |
5128 | ||
5129 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5130 | ua_chan, node.node) { | |
5131 | ret += ua_chan->streams.count; | |
5132 | } | |
5133 | } | |
5134 | rcu_read_unlock(); | |
5135 | break; | |
5136 | } | |
5137 | default: | |
5138 | assert(0); | |
5139 | break; | |
5140 | } | |
5141 | ||
5142 | return ret; | |
5143 | } |