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); |
ad7a9107 | 828 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 829 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 830 | |
8b366481 DG |
831 | return ua_sess; |
832 | ||
ffe60014 | 833 | error_free: |
8b366481 DG |
834 | return NULL; |
835 | } | |
836 | ||
837 | /* | |
838 | * Alloc new UST app channel. | |
839 | */ | |
840 | static | |
841 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 842 | struct ust_app_session *ua_sess, |
ffe60014 | 843 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
844 | { |
845 | struct ust_app_channel *ua_chan; | |
846 | ||
847 | /* Init most of the default value by allocating and zeroing */ | |
848 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
849 | if (ua_chan == NULL) { | |
850 | PERROR("malloc"); | |
851 | goto error; | |
852 | } | |
853 | ||
854 | /* Setup channel name */ | |
855 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
856 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
857 | ||
858 | ua_chan->enabled = 1; | |
859 | ua_chan->handle = -1; | |
45893984 | 860 | ua_chan->session = ua_sess; |
ffe60014 | 861 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
862 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
863 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
864 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
865 | |
866 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 867 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
868 | |
869 | /* Copy attributes */ | |
870 | if (attr) { | |
ffe60014 | 871 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
872 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
873 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
874 | ua_chan->attr.overwrite = attr->overwrite; | |
875 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
876 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
877 | ua_chan->attr.output = attr->output; | |
8b366481 | 878 | } |
ffe60014 DG |
879 | /* By default, the channel is a per cpu channel. */ |
880 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
881 | |
882 | DBG3("UST app channel %s allocated", ua_chan->name); | |
883 | ||
884 | return ua_chan; | |
885 | ||
886 | error: | |
887 | return NULL; | |
888 | } | |
889 | ||
37f1c236 DG |
890 | /* |
891 | * Allocate and initialize a UST app stream. | |
892 | * | |
893 | * Return newly allocated stream pointer or NULL on error. | |
894 | */ | |
ffe60014 | 895 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
896 | { |
897 | struct ust_app_stream *stream = NULL; | |
898 | ||
899 | stream = zmalloc(sizeof(*stream)); | |
900 | if (stream == NULL) { | |
901 | PERROR("zmalloc ust app stream"); | |
902 | goto error; | |
903 | } | |
904 | ||
905 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
906 | stream->handle = -1; | |
907 | ||
908 | error: | |
909 | return stream; | |
910 | } | |
911 | ||
8b366481 DG |
912 | /* |
913 | * Alloc new UST app event. | |
914 | */ | |
915 | static | |
916 | struct ust_app_event *alloc_ust_app_event(char *name, | |
917 | struct lttng_ust_event *attr) | |
918 | { | |
919 | struct ust_app_event *ua_event; | |
920 | ||
921 | /* Init most of the default value by allocating and zeroing */ | |
922 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
923 | if (ua_event == NULL) { | |
924 | PERROR("malloc"); | |
925 | goto error; | |
926 | } | |
927 | ||
928 | ua_event->enabled = 1; | |
929 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
930 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 931 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
932 | |
933 | /* Copy attributes */ | |
934 | if (attr) { | |
935 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
936 | } | |
937 | ||
938 | DBG3("UST app event %s allocated", ua_event->name); | |
939 | ||
940 | return ua_event; | |
941 | ||
942 | error: | |
943 | return NULL; | |
944 | } | |
945 | ||
946 | /* | |
947 | * Alloc new UST app context. | |
948 | */ | |
949 | static | |
950 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
951 | { | |
952 | struct ust_app_ctx *ua_ctx; | |
953 | ||
954 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
955 | if (ua_ctx == NULL) { | |
956 | goto error; | |
957 | } | |
958 | ||
31746f93 DG |
959 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
960 | ||
8b366481 DG |
961 | if (uctx) { |
962 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
963 | } | |
964 | ||
965 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
966 | ||
967 | error: | |
968 | return ua_ctx; | |
969 | } | |
970 | ||
025faf73 DG |
971 | /* |
972 | * Allocate a filter and copy the given original filter. | |
973 | * | |
974 | * Return allocated filter or NULL on error. | |
975 | */ | |
976 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
977 | struct lttng_ust_filter_bytecode *orig_f) | |
978 | { | |
979 | struct lttng_ust_filter_bytecode *filter = NULL; | |
980 | ||
981 | /* Copy filter bytecode */ | |
982 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
983 | if (!filter) { | |
984 | PERROR("zmalloc alloc ust app filter"); | |
985 | goto error; | |
986 | } | |
987 | ||
988 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
989 | ||
990 | error: | |
991 | return filter; | |
992 | } | |
993 | ||
099e26bd | 994 | /* |
421cb601 DG |
995 | * Find an ust_app using the sock and return it. RCU read side lock must be |
996 | * held before calling this helper function. | |
099e26bd | 997 | */ |
f20baf8e | 998 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 999 | { |
bec39940 | 1000 | struct lttng_ht_node_ulong *node; |
bec39940 | 1001 | struct lttng_ht_iter iter; |
f6a9efaa | 1002 | |
852d0037 | 1003 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1004 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1005 | if (node == NULL) { |
1006 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1007 | goto error; |
1008 | } | |
852d0037 DG |
1009 | |
1010 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1011 | |
1012 | error: | |
1013 | return NULL; | |
099e26bd DG |
1014 | } |
1015 | ||
d0b96690 DG |
1016 | /* |
1017 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1018 | * be held before calling this helper function. | |
1019 | */ | |
1020 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1021 | { | |
1022 | struct lttng_ht_node_ulong *node; | |
1023 | struct lttng_ht_iter iter; | |
1024 | ||
1025 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1026 | &iter); | |
1027 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1028 | if (node == NULL) { | |
1029 | DBG2("UST app find by notify sock %d not found", sock); | |
1030 | goto error; | |
1031 | } | |
1032 | ||
1033 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1034 | ||
1035 | error: | |
1036 | return NULL; | |
1037 | } | |
1038 | ||
025faf73 DG |
1039 | /* |
1040 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1041 | * event loglevel. | |
1042 | * | |
1043 | * Return an ust_app_event object or NULL on error. | |
1044 | */ | |
18eace3b | 1045 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
39c5a3a7 JI |
1046 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel, |
1047 | const struct lttng_event_exclusion *exclusion) | |
18eace3b DG |
1048 | { |
1049 | struct lttng_ht_iter iter; | |
1050 | struct lttng_ht_node_str *node; | |
1051 | struct ust_app_event *event = NULL; | |
1052 | struct ust_app_ht_key key; | |
18eace3b DG |
1053 | |
1054 | assert(name); | |
1055 | assert(ht); | |
1056 | ||
1057 | /* Setup key for event lookup. */ | |
1058 | key.name = name; | |
1059 | key.filter = filter; | |
1060 | key.loglevel = loglevel; | |
39c5a3a7 JI |
1061 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
1062 | key.exclusion = (struct lttng_ust_event_exclusion *)exclusion; | |
18eace3b | 1063 | |
025faf73 DG |
1064 | /* Lookup using the event name as hash and a custom match fct. */ |
1065 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1066 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1067 | node = lttng_ht_iter_get_node_str(&iter); |
1068 | if (node == NULL) { | |
1069 | goto end; | |
1070 | } | |
1071 | ||
1072 | event = caa_container_of(node, struct ust_app_event, node); | |
1073 | ||
1074 | end: | |
18eace3b DG |
1075 | return event; |
1076 | } | |
1077 | ||
55cc08a6 DG |
1078 | /* |
1079 | * Create the channel context on the tracer. | |
d0b96690 DG |
1080 | * |
1081 | * Called with UST app session lock held. | |
55cc08a6 DG |
1082 | */ |
1083 | static | |
1084 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1085 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1086 | { | |
1087 | int ret; | |
1088 | ||
840cb59c | 1089 | health_code_update(); |
86acf0da | 1090 | |
852d0037 | 1091 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1092 | ua_chan->obj, &ua_ctx->obj); |
1093 | if (ret < 0) { | |
ffe60014 DG |
1094 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1095 | ERR("UST app create channel context failed for app (pid: %d) " | |
1096 | "with ret %d", app->pid, ret); | |
1097 | } else { | |
3757b385 DG |
1098 | /* |
1099 | * This is normal behavior, an application can die during the | |
1100 | * creation process. Don't report an error so the execution can | |
1101 | * continue normally. | |
1102 | */ | |
1103 | ret = 0; | |
ffe60014 DG |
1104 | DBG3("UST app disable event failed. Application is dead."); |
1105 | } | |
55cc08a6 DG |
1106 | goto error; |
1107 | } | |
1108 | ||
1109 | ua_ctx->handle = ua_ctx->obj->handle; | |
1110 | ||
d0b96690 DG |
1111 | DBG2("UST app context handle %d created successfully for channel %s", |
1112 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1113 | |
1114 | error: | |
840cb59c | 1115 | health_code_update(); |
55cc08a6 DG |
1116 | return ret; |
1117 | } | |
1118 | ||
53a80697 MD |
1119 | /* |
1120 | * Set the filter on the tracer. | |
1121 | */ | |
1122 | static | |
1123 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1124 | struct ust_app *app) | |
1125 | { | |
1126 | int ret; | |
1127 | ||
840cb59c | 1128 | health_code_update(); |
86acf0da | 1129 | |
53a80697 | 1130 | if (!ua_event->filter) { |
86acf0da DG |
1131 | ret = 0; |
1132 | goto error; | |
53a80697 MD |
1133 | } |
1134 | ||
1135 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1136 | ua_event->obj); | |
1137 | if (ret < 0) { | |
ffe60014 DG |
1138 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1139 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1140 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1141 | } else { | |
3757b385 DG |
1142 | /* |
1143 | * This is normal behavior, an application can die during the | |
1144 | * creation process. Don't report an error so the execution can | |
1145 | * continue normally. | |
1146 | */ | |
1147 | ret = 0; | |
ffe60014 DG |
1148 | DBG3("UST app filter event failed. Application is dead."); |
1149 | } | |
53a80697 MD |
1150 | goto error; |
1151 | } | |
1152 | ||
1153 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1154 | ||
1155 | error: | |
840cb59c | 1156 | health_code_update(); |
53a80697 MD |
1157 | return ret; |
1158 | } | |
1159 | ||
7cc9a73c JI |
1160 | /* |
1161 | * Set event exclusions on the tracer. | |
1162 | */ | |
1163 | static | |
1164 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1165 | struct ust_app *app) | |
1166 | { | |
1167 | int ret; | |
1168 | ||
1169 | health_code_update(); | |
1170 | ||
1171 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1172 | ret = 0; | |
1173 | goto error; | |
1174 | } | |
1175 | ||
1176 | ret = ustctl_set_exclusion(app->sock, ua_event->exclusion, | |
1177 | ua_event->obj); | |
1178 | if (ret < 0) { | |
1179 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1180 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1181 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1182 | } else { | |
1183 | /* | |
1184 | * This is normal behavior, an application can die during the | |
1185 | * creation process. Don't report an error so the execution can | |
1186 | * continue normally. | |
1187 | */ | |
1188 | ret = 0; | |
1189 | DBG3("UST app event exclusion failed. Application is dead."); | |
1190 | } | |
1191 | goto error; | |
1192 | } | |
1193 | ||
1194 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1195 | ||
1196 | error: | |
1197 | health_code_update(); | |
1198 | return ret; | |
1199 | } | |
1200 | ||
9730260e DG |
1201 | /* |
1202 | * Disable the specified event on to UST tracer for the UST session. | |
1203 | */ | |
1204 | static int disable_ust_event(struct ust_app *app, | |
1205 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1206 | { | |
1207 | int ret; | |
1208 | ||
840cb59c | 1209 | health_code_update(); |
86acf0da | 1210 | |
852d0037 | 1211 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1212 | if (ret < 0) { |
ffe60014 DG |
1213 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1214 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1215 | "and session handle %d with ret %d", | |
1216 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1217 | } else { | |
3757b385 DG |
1218 | /* |
1219 | * This is normal behavior, an application can die during the | |
1220 | * creation process. Don't report an error so the execution can | |
1221 | * continue normally. | |
1222 | */ | |
1223 | ret = 0; | |
ffe60014 DG |
1224 | DBG3("UST app disable event failed. Application is dead."); |
1225 | } | |
9730260e DG |
1226 | goto error; |
1227 | } | |
1228 | ||
1229 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1230 | ua_event->attr.name, app->pid); |
9730260e DG |
1231 | |
1232 | error: | |
840cb59c | 1233 | health_code_update(); |
9730260e DG |
1234 | return ret; |
1235 | } | |
1236 | ||
78f0bacd DG |
1237 | /* |
1238 | * Disable the specified channel on to UST tracer for the UST session. | |
1239 | */ | |
1240 | static int disable_ust_channel(struct ust_app *app, | |
1241 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1242 | { | |
1243 | int ret; | |
1244 | ||
840cb59c | 1245 | health_code_update(); |
86acf0da | 1246 | |
852d0037 | 1247 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1248 | if (ret < 0) { |
ffe60014 DG |
1249 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1250 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1251 | "and session handle %d with ret %d", | |
1252 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1253 | } else { | |
3757b385 DG |
1254 | /* |
1255 | * This is normal behavior, an application can die during the | |
1256 | * creation process. Don't report an error so the execution can | |
1257 | * continue normally. | |
1258 | */ | |
1259 | ret = 0; | |
ffe60014 DG |
1260 | DBG3("UST app disable channel failed. Application is dead."); |
1261 | } | |
78f0bacd DG |
1262 | goto error; |
1263 | } | |
1264 | ||
78f0bacd | 1265 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1266 | ua_chan->name, app->pid); |
78f0bacd DG |
1267 | |
1268 | error: | |
840cb59c | 1269 | health_code_update(); |
78f0bacd DG |
1270 | return ret; |
1271 | } | |
1272 | ||
1273 | /* | |
1274 | * Enable the specified channel on to UST tracer for the UST session. | |
1275 | */ | |
1276 | static int enable_ust_channel(struct ust_app *app, | |
1277 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1278 | { | |
1279 | int ret; | |
1280 | ||
840cb59c | 1281 | health_code_update(); |
86acf0da | 1282 | |
852d0037 | 1283 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1284 | if (ret < 0) { |
ffe60014 DG |
1285 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1286 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1287 | "and session handle %d with ret %d", | |
1288 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1289 | } else { | |
3757b385 DG |
1290 | /* |
1291 | * This is normal behavior, an application can die during the | |
1292 | * creation process. Don't report an error so the execution can | |
1293 | * continue normally. | |
1294 | */ | |
1295 | ret = 0; | |
ffe60014 DG |
1296 | DBG3("UST app enable channel failed. Application is dead."); |
1297 | } | |
78f0bacd DG |
1298 | goto error; |
1299 | } | |
1300 | ||
1301 | ua_chan->enabled = 1; | |
1302 | ||
1303 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1304 | ua_chan->name, app->pid); |
78f0bacd DG |
1305 | |
1306 | error: | |
840cb59c | 1307 | health_code_update(); |
78f0bacd DG |
1308 | return ret; |
1309 | } | |
1310 | ||
edb67388 DG |
1311 | /* |
1312 | * Enable the specified event on to UST tracer for the UST session. | |
1313 | */ | |
1314 | static int enable_ust_event(struct ust_app *app, | |
1315 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1316 | { | |
1317 | int ret; | |
1318 | ||
840cb59c | 1319 | health_code_update(); |
86acf0da | 1320 | |
852d0037 | 1321 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1322 | if (ret < 0) { |
ffe60014 DG |
1323 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1324 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1325 | "and session handle %d with ret %d", | |
1326 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1327 | } else { | |
3757b385 DG |
1328 | /* |
1329 | * This is normal behavior, an application can die during the | |
1330 | * creation process. Don't report an error so the execution can | |
1331 | * continue normally. | |
1332 | */ | |
1333 | ret = 0; | |
ffe60014 DG |
1334 | DBG3("UST app enable event failed. Application is dead."); |
1335 | } | |
edb67388 DG |
1336 | goto error; |
1337 | } | |
1338 | ||
1339 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1340 | ua_event->attr.name, app->pid); |
edb67388 DG |
1341 | |
1342 | error: | |
840cb59c | 1343 | health_code_update(); |
edb67388 DG |
1344 | return ret; |
1345 | } | |
1346 | ||
099e26bd | 1347 | /* |
7972aab2 | 1348 | * Send channel and stream buffer to application. |
4f3ab6ee | 1349 | * |
ffe60014 | 1350 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1351 | */ |
7972aab2 DG |
1352 | static int send_channel_pid_to_ust(struct ust_app *app, |
1353 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1354 | { |
1355 | int ret; | |
ffe60014 | 1356 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1357 | |
1358 | assert(app); | |
ffe60014 | 1359 | assert(ua_sess); |
4f3ab6ee | 1360 | assert(ua_chan); |
4f3ab6ee | 1361 | |
840cb59c | 1362 | health_code_update(); |
4f3ab6ee | 1363 | |
7972aab2 DG |
1364 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1365 | app->sock); | |
86acf0da | 1366 | |
ffe60014 DG |
1367 | /* Send channel to the application. */ |
1368 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1369 | if (ret < 0) { |
b551a063 DG |
1370 | goto error; |
1371 | } | |
1372 | ||
d88aee68 DG |
1373 | health_code_update(); |
1374 | ||
ffe60014 DG |
1375 | /* Send all streams to application. */ |
1376 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1377 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1378 | if (ret < 0) { | |
1379 | goto error; | |
1380 | } | |
1381 | /* We don't need the stream anymore once sent to the tracer. */ | |
1382 | cds_list_del(&stream->list); | |
1383 | delete_ust_app_stream(-1, stream); | |
1384 | } | |
ffe60014 DG |
1385 | /* Flag the channel that it is sent to the application. */ |
1386 | ua_chan->is_sent = 1; | |
ffe60014 | 1387 | |
b551a063 | 1388 | error: |
840cb59c | 1389 | health_code_update(); |
b551a063 DG |
1390 | return ret; |
1391 | } | |
1392 | ||
91d76f53 | 1393 | /* |
5b4a0ec0 | 1394 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1395 | * |
1396 | * Should be called with session mutex held. | |
91d76f53 | 1397 | */ |
edb67388 DG |
1398 | static |
1399 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1400 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1401 | { |
5b4a0ec0 | 1402 | int ret = 0; |
284d8f55 | 1403 | |
840cb59c | 1404 | health_code_update(); |
86acf0da | 1405 | |
5b4a0ec0 | 1406 | /* Create UST event on tracer */ |
852d0037 | 1407 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1408 | &ua_event->obj); |
1409 | if (ret < 0) { | |
ffe60014 DG |
1410 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1411 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1412 | ua_event->attr.name, app->pid, ret); | |
1413 | } else { | |
3757b385 DG |
1414 | /* |
1415 | * This is normal behavior, an application can die during the | |
1416 | * creation process. Don't report an error so the execution can | |
1417 | * continue normally. | |
1418 | */ | |
1419 | ret = 0; | |
ffe60014 DG |
1420 | DBG3("UST app create event failed. Application is dead."); |
1421 | } | |
5b4a0ec0 | 1422 | goto error; |
91d76f53 | 1423 | } |
f6a9efaa | 1424 | |
5b4a0ec0 | 1425 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1426 | |
5b4a0ec0 | 1427 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1428 | ua_event->attr.name, app->pid); |
f6a9efaa | 1429 | |
840cb59c | 1430 | health_code_update(); |
86acf0da | 1431 | |
025faf73 DG |
1432 | /* Set filter if one is present. */ |
1433 | if (ua_event->filter) { | |
1434 | ret = set_ust_event_filter(ua_event, app); | |
1435 | if (ret < 0) { | |
1436 | goto error; | |
1437 | } | |
1438 | } | |
1439 | ||
7cc9a73c JI |
1440 | /* Set exclusions for the event */ |
1441 | if (ua_event->exclusion) { | |
1442 | ret = set_ust_event_exclusion(ua_event, app); | |
1443 | if (ret < 0) { | |
1444 | goto error; | |
1445 | } | |
1446 | } | |
1447 | ||
8535a6d9 | 1448 | /* If event not enabled, disable it on the tracer */ |
3a400966 MD |
1449 | if (ua_event->enabled) { |
1450 | /* | |
1451 | * We now need to explicitly enable the event, since it | |
1452 | * is now disabled at creation. | |
1453 | */ | |
1454 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1455 | if (ret < 0) { | |
1456 | /* | |
1457 | * If we hit an EPERM, something is wrong with our enable call. If | |
1458 | * we get an EEXIST, there is a problem on the tracer side since we | |
1459 | * just created it. | |
1460 | */ | |
1461 | switch (ret) { | |
1462 | case -LTTNG_UST_ERR_PERM: | |
1463 | /* Code flow problem */ | |
1464 | assert(0); | |
1465 | case -LTTNG_UST_ERR_EXIST: | |
1466 | /* It's OK for our use case. */ | |
1467 | ret = 0; | |
1468 | break; | |
1469 | default: | |
1470 | break; | |
1471 | } | |
1472 | goto error; | |
1473 | } | |
1474 | } else { | |
8535a6d9 DG |
1475 | ret = disable_ust_event(app, ua_sess, ua_event); |
1476 | if (ret < 0) { | |
fc34caaa DG |
1477 | /* |
1478 | * If we hit an EPERM, something is wrong with our disable call. If | |
1479 | * we get an EEXIST, there is a problem on the tracer side since we | |
1480 | * just created it. | |
1481 | */ | |
1482 | switch (ret) { | |
49c336c1 | 1483 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1484 | /* Code flow problem */ |
1485 | assert(0); | |
49c336c1 | 1486 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1487 | /* It's OK for our use case. */ |
1488 | ret = 0; | |
1489 | break; | |
1490 | default: | |
1491 | break; | |
1492 | } | |
8535a6d9 DG |
1493 | goto error; |
1494 | } | |
1495 | } | |
1496 | ||
5b4a0ec0 | 1497 | error: |
840cb59c | 1498 | health_code_update(); |
5b4a0ec0 | 1499 | return ret; |
91d76f53 | 1500 | } |
48842b30 | 1501 | |
5b4a0ec0 DG |
1502 | /* |
1503 | * Copy data between an UST app event and a LTT event. | |
1504 | */ | |
421cb601 | 1505 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1506 | struct ltt_ust_event *uevent) |
1507 | { | |
b4ffad32 JI |
1508 | size_t exclusion_alloc_size; |
1509 | ||
48842b30 DG |
1510 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1511 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1512 | ||
fc34caaa DG |
1513 | ua_event->enabled = uevent->enabled; |
1514 | ||
5b4a0ec0 DG |
1515 | /* Copy event attributes */ |
1516 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1517 | ||
53a80697 MD |
1518 | /* Copy filter bytecode */ |
1519 | if (uevent->filter) { | |
025faf73 DG |
1520 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1521 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1522 | } |
b4ffad32 JI |
1523 | |
1524 | /* Copy exclusion data */ | |
1525 | if (uevent->exclusion) { | |
1526 | exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1527 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; | |
1528 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1529 | if (ua_event->exclusion == NULL) { |
1530 | PERROR("malloc"); | |
1531 | } else { | |
1532 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1533 | exclusion_alloc_size); | |
b4ffad32 JI |
1534 | } |
1535 | } | |
48842b30 DG |
1536 | } |
1537 | ||
5b4a0ec0 DG |
1538 | /* |
1539 | * Copy data between an UST app channel and a LTT channel. | |
1540 | */ | |
421cb601 | 1541 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1542 | struct ltt_ust_channel *uchan) |
1543 | { | |
bec39940 | 1544 | struct lttng_ht_iter iter; |
48842b30 | 1545 | struct ltt_ust_event *uevent; |
55cc08a6 | 1546 | struct ltt_ust_context *uctx; |
48842b30 | 1547 | struct ust_app_event *ua_event; |
55cc08a6 | 1548 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1549 | |
fc34caaa | 1550 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1551 | |
1552 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1553 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1554 | |
1624d5b7 JD |
1555 | ua_chan->tracefile_size = uchan->tracefile_size; |
1556 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1557 | ||
ffe60014 DG |
1558 | /* Copy event attributes since the layout is different. */ |
1559 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1560 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1561 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1562 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1563 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1564 | ua_chan->attr.output = uchan->attr.output; | |
1565 | /* | |
1566 | * Note that the attribute channel type is not set since the channel on the | |
1567 | * tracing registry side does not have this information. | |
1568 | */ | |
48842b30 | 1569 | |
fc34caaa | 1570 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1571 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1572 | |
31746f93 | 1573 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1574 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1575 | if (ua_ctx == NULL) { | |
1576 | continue; | |
1577 | } | |
bec39940 DG |
1578 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1579 | (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 1580 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 1581 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1582 | } |
48842b30 | 1583 | |
421cb601 | 1584 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1585 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1586 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1587 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1588 | if (ua_event == NULL) { |
421cb601 | 1589 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1590 | uevent->attr.name); |
284d8f55 | 1591 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1592 | if (ua_event == NULL) { |
5b4a0ec0 | 1593 | continue; |
48842b30 | 1594 | } |
421cb601 | 1595 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1596 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1597 | } |
48842b30 DG |
1598 | } |
1599 | ||
fc34caaa | 1600 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1601 | } |
1602 | ||
5b4a0ec0 DG |
1603 | /* |
1604 | * Copy data between a UST app session and a regular LTT session. | |
1605 | */ | |
421cb601 | 1606 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1607 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1608 | { |
bec39940 DG |
1609 | struct lttng_ht_node_str *ua_chan_node; |
1610 | struct lttng_ht_iter iter; | |
48842b30 DG |
1611 | struct ltt_ust_channel *uchan; |
1612 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1613 | time_t rawtime; |
1614 | struct tm *timeinfo; | |
1615 | char datetime[16]; | |
1616 | int ret; | |
1617 | ||
1618 | /* Get date and time for unique app path */ | |
1619 | time(&rawtime); | |
1620 | timeinfo = localtime(&rawtime); | |
1621 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1622 | |
421cb601 | 1623 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1624 | |
7972aab2 DG |
1625 | ua_sess->tracing_id = usess->id; |
1626 | ua_sess->id = get_next_session_id(); | |
1627 | ua_sess->uid = app->uid; | |
1628 | ua_sess->gid = app->gid; | |
1629 | ua_sess->euid = usess->uid; | |
1630 | ua_sess->egid = usess->gid; | |
1631 | ua_sess->buffer_type = usess->buffer_type; | |
1632 | ua_sess->bits_per_long = app->bits_per_long; | |
1633 | /* There is only one consumer object per session possible. */ | |
1634 | ua_sess->consumer = usess->consumer; | |
2bba9e53 | 1635 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1636 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1637 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1638 | &usess->metadata_attr); | |
7972aab2 DG |
1639 | |
1640 | switch (ua_sess->buffer_type) { | |
1641 | case LTTNG_BUFFER_PER_PID: | |
1642 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1643 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1644 | datetime); |
1645 | break; | |
1646 | case LTTNG_BUFFER_PER_UID: | |
1647 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1648 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1649 | break; | |
1650 | default: | |
1651 | assert(0); | |
1652 | goto error; | |
1653 | } | |
477d7741 MD |
1654 | if (ret < 0) { |
1655 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1656 | assert(0); |
7972aab2 | 1657 | goto error; |
477d7741 MD |
1658 | } |
1659 | ||
48842b30 | 1660 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1661 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1662 | uchan, node.node) { | |
1663 | struct lttng_ht_iter uiter; | |
ba767faf | 1664 | |
bec39940 DG |
1665 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1666 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1667 | if (ua_chan_node != NULL) { |
fc34caaa | 1668 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1669 | continue; |
1670 | } | |
421cb601 | 1671 | |
5b4a0ec0 DG |
1672 | DBG2("Channel %s not found on shadow session copy, creating it", |
1673 | uchan->name); | |
d0b96690 | 1674 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1675 | if (ua_chan == NULL) { |
fc34caaa | 1676 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1677 | continue; |
48842b30 | 1678 | } |
5b4a0ec0 | 1679 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1680 | /* |
1681 | * The concept of metadata channel does not exist on the tracing | |
1682 | * registry side of the session daemon so this can only be a per CPU | |
1683 | * channel and not metadata. | |
1684 | */ | |
1685 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1686 | ||
bec39940 | 1687 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1688 | } |
7972aab2 DG |
1689 | |
1690 | error: | |
1691 | return; | |
48842b30 DG |
1692 | } |
1693 | ||
78f0bacd DG |
1694 | /* |
1695 | * Lookup sesison wrapper. | |
1696 | */ | |
84cd17c6 MD |
1697 | static |
1698 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1699 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1700 | { |
1701 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1702 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1703 | } |
1704 | ||
421cb601 DG |
1705 | /* |
1706 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1707 | * id. |
421cb601 | 1708 | */ |
48842b30 DG |
1709 | static struct ust_app_session *lookup_session_by_app( |
1710 | struct ltt_ust_session *usess, struct ust_app *app) | |
1711 | { | |
bec39940 | 1712 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1713 | struct lttng_ht_node_u64 *node; |
48842b30 | 1714 | |
84cd17c6 | 1715 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1716 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1717 | if (node == NULL) { |
1718 | goto error; | |
1719 | } | |
1720 | ||
1721 | return caa_container_of(node, struct ust_app_session, node); | |
1722 | ||
1723 | error: | |
1724 | return NULL; | |
1725 | } | |
1726 | ||
7972aab2 DG |
1727 | /* |
1728 | * Setup buffer registry per PID for the given session and application. If none | |
1729 | * is found, a new one is created, added to the global registry and | |
1730 | * initialized. If regp is valid, it's set with the newly created object. | |
1731 | * | |
1732 | * Return 0 on success or else a negative value. | |
1733 | */ | |
1734 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1735 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1736 | { | |
1737 | int ret = 0; | |
1738 | struct buffer_reg_pid *reg_pid; | |
1739 | ||
1740 | assert(ua_sess); | |
1741 | assert(app); | |
1742 | ||
1743 | rcu_read_lock(); | |
1744 | ||
1745 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1746 | if (!reg_pid) { | |
1747 | /* | |
1748 | * This is the create channel path meaning that if there is NO | |
1749 | * registry available, we have to create one for this session. | |
1750 | */ | |
1751 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1752 | if (ret < 0) { | |
1753 | goto error; | |
1754 | } | |
1755 | buffer_reg_pid_add(reg_pid); | |
1756 | } else { | |
1757 | goto end; | |
1758 | } | |
1759 | ||
1760 | /* Initialize registry. */ | |
1761 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1762 | app->bits_per_long, app->uint8_t_alignment, | |
1763 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1764 | app->uint64_t_alignment, app->long_alignment, |
1765 | app->byte_order, app->version.major, | |
1766 | app->version.minor); | |
7972aab2 DG |
1767 | if (ret < 0) { |
1768 | goto error; | |
1769 | } | |
1770 | ||
1771 | DBG3("UST app buffer registry per PID created successfully"); | |
1772 | ||
1773 | end: | |
1774 | if (regp) { | |
1775 | *regp = reg_pid; | |
1776 | } | |
1777 | error: | |
1778 | rcu_read_unlock(); | |
1779 | return ret; | |
1780 | } | |
1781 | ||
1782 | /* | |
1783 | * Setup buffer registry per UID for the given session and application. If none | |
1784 | * is found, a new one is created, added to the global registry and | |
1785 | * initialized. If regp is valid, it's set with the newly created object. | |
1786 | * | |
1787 | * Return 0 on success or else a negative value. | |
1788 | */ | |
1789 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1790 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1791 | { | |
1792 | int ret = 0; | |
1793 | struct buffer_reg_uid *reg_uid; | |
1794 | ||
1795 | assert(usess); | |
1796 | assert(app); | |
1797 | ||
1798 | rcu_read_lock(); | |
1799 | ||
1800 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1801 | if (!reg_uid) { | |
1802 | /* | |
1803 | * This is the create channel path meaning that if there is NO | |
1804 | * registry available, we have to create one for this session. | |
1805 | */ | |
1806 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1807 | LTTNG_DOMAIN_UST, ®_uid); | |
1808 | if (ret < 0) { | |
1809 | goto error; | |
1810 | } | |
1811 | buffer_reg_uid_add(reg_uid); | |
1812 | } else { | |
1813 | goto end; | |
1814 | } | |
1815 | ||
1816 | /* Initialize registry. */ | |
af6142cf | 1817 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1818 | app->bits_per_long, app->uint8_t_alignment, |
1819 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1820 | app->uint64_t_alignment, app->long_alignment, |
1821 | app->byte_order, app->version.major, | |
1822 | app->version.minor); | |
7972aab2 DG |
1823 | if (ret < 0) { |
1824 | goto error; | |
1825 | } | |
1826 | /* Add node to teardown list of the session. */ | |
1827 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1828 | ||
1829 | DBG3("UST app buffer registry per UID created successfully"); | |
1830 | ||
1831 | end: | |
1832 | if (regp) { | |
1833 | *regp = reg_uid; | |
1834 | } | |
1835 | error: | |
1836 | rcu_read_unlock(); | |
1837 | return ret; | |
1838 | } | |
1839 | ||
421cb601 | 1840 | /* |
3d8ca23b | 1841 | * Create a session on the tracer side for the given app. |
421cb601 | 1842 | * |
3d8ca23b DG |
1843 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1844 | * untouched. If the session was created, is_created is set to 1. On error, | |
1845 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1846 | * be NULL. | |
1847 | * | |
1848 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1849 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1850 | */ |
3d8ca23b DG |
1851 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1852 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1853 | int *is_created) | |
421cb601 | 1854 | { |
3d8ca23b | 1855 | int ret, created = 0; |
421cb601 DG |
1856 | struct ust_app_session *ua_sess; |
1857 | ||
3d8ca23b DG |
1858 | assert(usess); |
1859 | assert(app); | |
1860 | assert(ua_sess_ptr); | |
1861 | ||
840cb59c | 1862 | health_code_update(); |
86acf0da | 1863 | |
421cb601 DG |
1864 | ua_sess = lookup_session_by_app(usess, app); |
1865 | if (ua_sess == NULL) { | |
d9bf3ca4 | 1866 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1867 | app->pid, usess->id); |
d0b96690 | 1868 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1869 | if (ua_sess == NULL) { |
1870 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1871 | ret = -ENOMEM; |
1872 | goto error; | |
421cb601 | 1873 | } |
477d7741 | 1874 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1875 | created = 1; |
421cb601 DG |
1876 | } |
1877 | ||
7972aab2 DG |
1878 | switch (usess->buffer_type) { |
1879 | case LTTNG_BUFFER_PER_PID: | |
1880 | /* Init local registry. */ | |
1881 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1882 | if (ret < 0) { |
7972aab2 DG |
1883 | goto error; |
1884 | } | |
1885 | break; | |
1886 | case LTTNG_BUFFER_PER_UID: | |
1887 | /* Look for a global registry. If none exists, create one. */ | |
1888 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1889 | if (ret < 0) { | |
1890 | goto error; | |
1891 | } | |
1892 | break; | |
1893 | default: | |
1894 | assert(0); | |
1895 | ret = -EINVAL; | |
1896 | goto error; | |
1897 | } | |
1898 | ||
1899 | health_code_update(); | |
1900 | ||
1901 | if (ua_sess->handle == -1) { | |
1902 | ret = ustctl_create_session(app->sock); | |
1903 | if (ret < 0) { | |
1904 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1905 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1906 | app->pid, ret); |
1907 | } else { | |
1908 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
1909 | /* |
1910 | * This is normal behavior, an application can die during the | |
1911 | * creation process. Don't report an error so the execution can | |
1912 | * continue normally. This will get flagged ENOTCONN and the | |
1913 | * caller will handle it. | |
1914 | */ | |
1915 | ret = 0; | |
ffe60014 | 1916 | } |
d0b96690 | 1917 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1918 | if (ret != -ENOMEM) { |
1919 | /* | |
1920 | * Tracer is probably gone or got an internal error so let's | |
1921 | * behave like it will soon unregister or not usable. | |
1922 | */ | |
1923 | ret = -ENOTCONN; | |
1924 | } | |
1925 | goto error; | |
421cb601 DG |
1926 | } |
1927 | ||
7972aab2 DG |
1928 | ua_sess->handle = ret; |
1929 | ||
1930 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
1931 | lttng_ht_node_init_u64(&ua_sess->node, |
1932 | ua_sess->tracing_id); | |
1933 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1934 | |
1935 | DBG2("UST app session created successfully with handle %d", ret); | |
1936 | } | |
1937 | ||
1938 | *ua_sess_ptr = ua_sess; | |
1939 | if (is_created) { | |
1940 | *is_created = created; | |
1941 | } | |
1942 | ||
1943 | /* Everything went well. */ | |
1944 | ret = 0; | |
1945 | ||
1946 | error: | |
1947 | health_code_update(); | |
1948 | return ret; | |
1949 | } | |
1950 | ||
394235f5 JG |
1951 | /* |
1952 | * Match function for a hash table lookup of ust_app_ctx. | |
1953 | * | |
1954 | * It matches an ust app context based on the context type and, in the case | |
1955 | * of perf counters, their name. | |
1956 | */ | |
1957 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
1958 | { | |
1959 | struct ust_app_ctx *ctx; | |
1960 | const struct lttng_ust_context *key; | |
1961 | ||
1962 | assert(node); | |
1963 | assert(_key); | |
1964 | ||
1965 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
1966 | key = _key; | |
1967 | ||
1968 | /* Context type */ | |
1969 | if (ctx->ctx.ctx != key->ctx) { | |
1970 | goto no_match; | |
1971 | } | |
1972 | ||
1973 | /* Check the name in the case of perf thread counters. */ | |
1974 | if (key->ctx == LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER) { | |
1975 | if (strncmp(key->u.perf_counter.name, | |
1976 | ctx->ctx.u.perf_counter.name, | |
1977 | sizeof(key->u.perf_counter.name))) { | |
1978 | goto no_match; | |
1979 | } | |
1980 | } | |
1981 | ||
1982 | /* Match. */ | |
1983 | return 1; | |
1984 | ||
1985 | no_match: | |
1986 | return 0; | |
1987 | } | |
1988 | ||
1989 | /* | |
1990 | * Lookup for an ust app context from an lttng_ust_context. | |
1991 | * | |
a4b56f4f | 1992 | * Must be called while holding RCU read side lock. |
394235f5 JG |
1993 | * Return an ust_app_ctx object or NULL on error. |
1994 | */ | |
1995 | static | |
1996 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
1997 | struct lttng_ust_context *uctx) | |
1998 | { | |
1999 | struct lttng_ht_iter iter; | |
2000 | struct lttng_ht_node_ulong *node; | |
2001 | struct ust_app_ctx *app_ctx = NULL; | |
2002 | ||
2003 | assert(uctx); | |
2004 | assert(ht); | |
2005 | ||
2006 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2007 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2008 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2009 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2010 | if (!node) { | |
2011 | goto end; | |
2012 | } | |
2013 | ||
2014 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2015 | ||
2016 | end: | |
2017 | return app_ctx; | |
2018 | } | |
2019 | ||
7972aab2 DG |
2020 | /* |
2021 | * Create a context for the channel on the tracer. | |
2022 | * | |
2023 | * Called with UST app session lock held and a RCU read side lock. | |
2024 | */ | |
2025 | static | |
2026 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
2027 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
2028 | struct ust_app *app) | |
2029 | { | |
2030 | int ret = 0; | |
7972aab2 DG |
2031 | struct ust_app_ctx *ua_ctx; |
2032 | ||
2033 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2034 | ||
394235f5 JG |
2035 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2036 | if (ua_ctx) { | |
7972aab2 DG |
2037 | ret = -EEXIST; |
2038 | goto error; | |
2039 | } | |
2040 | ||
2041 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2042 | if (ua_ctx == NULL) { | |
2043 | /* malloc failed */ | |
2044 | ret = -1; | |
2045 | goto error; | |
2046 | } | |
2047 | ||
2048 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2049 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2050 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2051 | |
2052 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2053 | if (ret < 0) { | |
2054 | goto error; | |
2055 | } | |
2056 | ||
2057 | error: | |
2058 | return ret; | |
2059 | } | |
2060 | ||
2061 | /* | |
2062 | * Enable on the tracer side a ust app event for the session and channel. | |
2063 | * | |
2064 | * Called with UST app session lock held. | |
2065 | */ | |
2066 | static | |
2067 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2068 | struct ust_app_event *ua_event, struct ust_app *app) | |
2069 | { | |
2070 | int ret; | |
2071 | ||
2072 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2073 | if (ret < 0) { | |
2074 | goto error; | |
2075 | } | |
2076 | ||
2077 | ua_event->enabled = 1; | |
2078 | ||
2079 | error: | |
2080 | return ret; | |
2081 | } | |
2082 | ||
2083 | /* | |
2084 | * Disable on the tracer side a ust app event for the session and channel. | |
2085 | */ | |
2086 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2087 | struct ust_app_event *ua_event, struct ust_app *app) | |
2088 | { | |
2089 | int ret; | |
2090 | ||
2091 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2092 | if (ret < 0) { | |
2093 | goto error; | |
2094 | } | |
2095 | ||
2096 | ua_event->enabled = 0; | |
2097 | ||
2098 | error: | |
2099 | return ret; | |
2100 | } | |
2101 | ||
2102 | /* | |
2103 | * Lookup ust app channel for session and disable it on the tracer side. | |
2104 | */ | |
2105 | static | |
2106 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2107 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2108 | { | |
2109 | int ret; | |
2110 | ||
2111 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2112 | if (ret < 0) { | |
2113 | goto error; | |
2114 | } | |
2115 | ||
2116 | ua_chan->enabled = 0; | |
2117 | ||
2118 | error: | |
2119 | return ret; | |
2120 | } | |
2121 | ||
2122 | /* | |
2123 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2124 | * MUST be called with a RCU read side lock acquired. | |
2125 | */ | |
2126 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2127 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2128 | { | |
2129 | int ret = 0; | |
2130 | struct lttng_ht_iter iter; | |
2131 | struct lttng_ht_node_str *ua_chan_node; | |
2132 | struct ust_app_channel *ua_chan; | |
2133 | ||
2134 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2135 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2136 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2137 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2138 | uchan->name, ua_sess->tracing_id); |
2139 | goto error; | |
2140 | } | |
2141 | ||
2142 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2143 | ||
2144 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2145 | if (ret < 0) { | |
2146 | goto error; | |
2147 | } | |
2148 | ||
2149 | error: | |
2150 | return ret; | |
2151 | } | |
2152 | ||
2153 | /* | |
2154 | * Ask the consumer to create a channel and get it if successful. | |
2155 | * | |
2156 | * Return 0 on success or else a negative value. | |
2157 | */ | |
2158 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2159 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2160 | int bitness, struct ust_registry_session *registry) | |
2161 | { | |
2162 | int ret; | |
2163 | unsigned int nb_fd = 0; | |
2164 | struct consumer_socket *socket; | |
2165 | ||
2166 | assert(usess); | |
2167 | assert(ua_sess); | |
2168 | assert(ua_chan); | |
2169 | assert(registry); | |
2170 | ||
2171 | rcu_read_lock(); | |
2172 | health_code_update(); | |
2173 | ||
2174 | /* Get the right consumer socket for the application. */ | |
2175 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2176 | if (!socket) { | |
2177 | ret = -EINVAL; | |
2178 | goto error; | |
2179 | } | |
2180 | ||
2181 | health_code_update(); | |
2182 | ||
2183 | /* Need one fd for the channel. */ | |
2184 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2185 | if (ret < 0) { | |
2186 | ERR("Exhausted number of available FD upon create channel"); | |
2187 | goto error; | |
2188 | } | |
2189 | ||
2190 | /* | |
2191 | * Ask consumer to create channel. The consumer will return the number of | |
2192 | * stream we have to expect. | |
2193 | */ | |
2194 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2195 | registry); | |
2196 | if (ret < 0) { | |
2197 | goto error_ask; | |
2198 | } | |
2199 | ||
2200 | /* | |
2201 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2202 | * stream (2 being the default value here). | |
2203 | */ | |
2204 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2205 | ||
2206 | /* Reserve the amount of file descriptor we need. */ | |
2207 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2208 | if (ret < 0) { | |
2209 | ERR("Exhausted number of available FD upon create channel"); | |
2210 | goto error_fd_get_stream; | |
2211 | } | |
2212 | ||
2213 | health_code_update(); | |
2214 | ||
2215 | /* | |
2216 | * Now get the channel from the consumer. This call wil populate the stream | |
2217 | * list of that channel and set the ust objects. | |
2218 | */ | |
d9078d0c DG |
2219 | if (usess->consumer->enabled) { |
2220 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2221 | if (ret < 0) { | |
2222 | goto error_destroy; | |
2223 | } | |
7972aab2 DG |
2224 | } |
2225 | ||
2226 | rcu_read_unlock(); | |
2227 | return 0; | |
2228 | ||
2229 | error_destroy: | |
2230 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2231 | error_fd_get_stream: | |
2232 | /* | |
2233 | * Initiate a destroy channel on the consumer since we had an error | |
2234 | * handling it on our side. The return value is of no importance since we | |
2235 | * already have a ret value set by the previous error that we need to | |
2236 | * return. | |
2237 | */ | |
2238 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2239 | error_ask: | |
2240 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2241 | error: | |
2242 | health_code_update(); | |
2243 | rcu_read_unlock(); | |
2244 | return ret; | |
2245 | } | |
2246 | ||
2247 | /* | |
2248 | * Duplicate the ust data object of the ust app stream and save it in the | |
2249 | * buffer registry stream. | |
2250 | * | |
2251 | * Return 0 on success or else a negative value. | |
2252 | */ | |
2253 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2254 | struct ust_app_stream *stream) | |
2255 | { | |
2256 | int ret; | |
2257 | ||
2258 | assert(reg_stream); | |
2259 | assert(stream); | |
2260 | ||
2261 | /* Reserve the amount of file descriptor we need. */ | |
2262 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2263 | if (ret < 0) { | |
2264 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2265 | goto error; | |
2266 | } | |
2267 | ||
2268 | /* Duplicate object for stream once the original is in the registry. */ | |
2269 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2270 | reg_stream->obj.ust); | |
2271 | if (ret < 0) { | |
2272 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2273 | reg_stream->obj.ust, stream->obj, ret); | |
2274 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2275 | goto error; | |
2276 | } | |
2277 | stream->handle = stream->obj->handle; | |
2278 | ||
2279 | error: | |
2280 | return ret; | |
2281 | } | |
2282 | ||
2283 | /* | |
2284 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2285 | * buffer registry channel. | |
2286 | * | |
2287 | * Return 0 on success or else a negative value. | |
2288 | */ | |
2289 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2290 | struct ust_app_channel *ua_chan) | |
2291 | { | |
2292 | int ret; | |
2293 | ||
2294 | assert(reg_chan); | |
2295 | assert(ua_chan); | |
2296 | ||
2297 | /* Need two fds for the channel. */ | |
2298 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2299 | if (ret < 0) { | |
2300 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2301 | goto error_fd_get; | |
2302 | } | |
2303 | ||
2304 | /* Duplicate object for stream once the original is in the registry. */ | |
2305 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2306 | if (ret < 0) { | |
2307 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2308 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2309 | goto error; | |
2310 | } | |
2311 | ua_chan->handle = ua_chan->obj->handle; | |
2312 | ||
2313 | return 0; | |
2314 | ||
2315 | error: | |
2316 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2317 | error_fd_get: | |
2318 | return ret; | |
2319 | } | |
2320 | ||
2321 | /* | |
2322 | * For a given channel buffer registry, setup all streams of the given ust | |
2323 | * application channel. | |
2324 | * | |
2325 | * Return 0 on success or else a negative value. | |
2326 | */ | |
2327 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2328 | struct ust_app_channel *ua_chan) | |
2329 | { | |
2330 | int ret = 0; | |
2331 | struct ust_app_stream *stream, *stmp; | |
2332 | ||
2333 | assert(reg_chan); | |
2334 | assert(ua_chan); | |
2335 | ||
2336 | DBG2("UST app setup buffer registry stream"); | |
2337 | ||
2338 | /* Send all streams to application. */ | |
2339 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2340 | struct buffer_reg_stream *reg_stream; | |
2341 | ||
2342 | ret = buffer_reg_stream_create(®_stream); | |
2343 | if (ret < 0) { | |
2344 | goto error; | |
2345 | } | |
2346 | ||
2347 | /* | |
2348 | * Keep original pointer and nullify it in the stream so the delete | |
2349 | * stream call does not release the object. | |
2350 | */ | |
2351 | reg_stream->obj.ust = stream->obj; | |
2352 | stream->obj = NULL; | |
2353 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2354 | |
7972aab2 DG |
2355 | /* We don't need the streams anymore. */ |
2356 | cds_list_del(&stream->list); | |
2357 | delete_ust_app_stream(-1, stream); | |
2358 | } | |
421cb601 | 2359 | |
7972aab2 DG |
2360 | error: |
2361 | return ret; | |
2362 | } | |
2363 | ||
2364 | /* | |
2365 | * Create a buffer registry channel for the given session registry and | |
2366 | * application channel object. If regp pointer is valid, it's set with the | |
2367 | * created object. Important, the created object is NOT added to the session | |
2368 | * registry hash table. | |
2369 | * | |
2370 | * Return 0 on success else a negative value. | |
2371 | */ | |
2372 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2373 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2374 | { | |
2375 | int ret; | |
2376 | struct buffer_reg_channel *reg_chan = NULL; | |
2377 | ||
2378 | assert(reg_sess); | |
2379 | assert(ua_chan); | |
2380 | ||
2381 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2382 | ||
2383 | /* Create buffer registry channel. */ | |
2384 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2385 | if (ret < 0) { | |
2386 | goto error_create; | |
421cb601 | 2387 | } |
7972aab2 DG |
2388 | assert(reg_chan); |
2389 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2390 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
421cb601 | 2391 | |
7972aab2 DG |
2392 | /* Create and add a channel registry to session. */ |
2393 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2394 | ua_chan->tracing_channel_id); | |
2395 | if (ret < 0) { | |
2396 | goto error; | |
d88aee68 | 2397 | } |
7972aab2 | 2398 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2399 | |
7972aab2 DG |
2400 | if (regp) { |
2401 | *regp = reg_chan; | |
3d8ca23b | 2402 | } |
d88aee68 | 2403 | |
7972aab2 | 2404 | return 0; |
3d8ca23b DG |
2405 | |
2406 | error: | |
7972aab2 DG |
2407 | /* Safe because the registry channel object was not added to any HT. */ |
2408 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2409 | error_create: | |
3d8ca23b | 2410 | return ret; |
421cb601 DG |
2411 | } |
2412 | ||
55cc08a6 | 2413 | /* |
7972aab2 DG |
2414 | * Setup buffer registry channel for the given session registry and application |
2415 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2416 | * |
7972aab2 | 2417 | * Return 0 on success else a negative value. |
55cc08a6 | 2418 | */ |
7972aab2 DG |
2419 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2420 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2421 | { |
7972aab2 | 2422 | int ret; |
55cc08a6 | 2423 | |
7972aab2 DG |
2424 | assert(reg_sess); |
2425 | assert(reg_chan); | |
2426 | assert(ua_chan); | |
2427 | assert(ua_chan->obj); | |
55cc08a6 | 2428 | |
7972aab2 | 2429 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2430 | |
7972aab2 DG |
2431 | /* Setup all streams for the registry. */ |
2432 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2433 | if (ret < 0) { | |
55cc08a6 DG |
2434 | goto error; |
2435 | } | |
2436 | ||
7972aab2 DG |
2437 | reg_chan->obj.ust = ua_chan->obj; |
2438 | ua_chan->obj = NULL; | |
55cc08a6 | 2439 | |
7972aab2 | 2440 | return 0; |
55cc08a6 DG |
2441 | |
2442 | error: | |
7972aab2 DG |
2443 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2444 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2445 | return ret; |
2446 | } | |
2447 | ||
edb67388 | 2448 | /* |
7972aab2 | 2449 | * Send buffer registry channel to the application. |
d0b96690 | 2450 | * |
7972aab2 | 2451 | * Return 0 on success else a negative value. |
edb67388 | 2452 | */ |
7972aab2 DG |
2453 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2454 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2455 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2456 | { |
2457 | int ret; | |
7972aab2 | 2458 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2459 | |
7972aab2 DG |
2460 | assert(reg_chan); |
2461 | assert(app); | |
2462 | assert(ua_sess); | |
2463 | assert(ua_chan); | |
2464 | ||
2465 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2466 | ||
2467 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2468 | if (ret < 0) { |
2469 | goto error; | |
2470 | } | |
2471 | ||
7972aab2 DG |
2472 | /* Send channel to the application. */ |
2473 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2474 | if (ret < 0) { | |
2475 | goto error; | |
2476 | } | |
2477 | ||
2478 | health_code_update(); | |
2479 | ||
2480 | /* Send all streams to application. */ | |
2481 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2482 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2483 | struct ust_app_stream stream; | |
2484 | ||
2485 | ret = duplicate_stream_object(reg_stream, &stream); | |
2486 | if (ret < 0) { | |
2487 | goto error_stream_unlock; | |
2488 | } | |
2489 | ||
2490 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2491 | if (ret < 0) { | |
8c067051 | 2492 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2493 | goto error_stream_unlock; |
2494 | } | |
edb67388 | 2495 | |
7972aab2 DG |
2496 | /* |
2497 | * The return value is not important here. This function will output an | |
2498 | * error if needed. | |
2499 | */ | |
2500 | (void) release_ust_app_stream(-1, &stream); | |
2501 | } | |
2502 | ua_chan->is_sent = 1; | |
2503 | ||
2504 | error_stream_unlock: | |
2505 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2506 | error: |
2507 | return ret; | |
2508 | } | |
2509 | ||
9730260e | 2510 | /* |
7972aab2 DG |
2511 | * Create and send to the application the created buffers with per UID buffers. |
2512 | * | |
2513 | * Return 0 on success else a negative value. | |
9730260e | 2514 | */ |
7972aab2 DG |
2515 | static int create_channel_per_uid(struct ust_app *app, |
2516 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2517 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2518 | { |
2519 | int ret; | |
7972aab2 DG |
2520 | struct buffer_reg_uid *reg_uid; |
2521 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2522 | |
7972aab2 DG |
2523 | assert(app); |
2524 | assert(usess); | |
2525 | assert(ua_sess); | |
2526 | assert(ua_chan); | |
2527 | ||
2528 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2529 | ||
2530 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2531 | /* | |
2532 | * The session creation handles the creation of this global registry | |
2533 | * object. If none can be find, there is a code flow problem or a | |
2534 | * teardown race. | |
2535 | */ | |
2536 | assert(reg_uid); | |
2537 | ||
2538 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2539 | reg_uid); | |
2540 | if (!reg_chan) { | |
2541 | /* Create the buffer registry channel object. */ | |
2542 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2543 | if (ret < 0) { | |
f14256d6 MD |
2544 | ERR("Error creating the UST channel \"%s\" registry instance", |
2545 | ua_chan->name); | |
7972aab2 DG |
2546 | goto error; |
2547 | } | |
2548 | assert(reg_chan); | |
2549 | ||
2550 | /* | |
2551 | * Create the buffers on the consumer side. This call populates the | |
2552 | * ust app channel object with all streams and data object. | |
2553 | */ | |
2554 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2555 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2556 | if (ret < 0) { | |
f14256d6 MD |
2557 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2558 | ua_chan->name); | |
2559 | ||
07d2ae95 DG |
2560 | /* |
2561 | * Let's remove the previously created buffer registry channel so | |
2562 | * it's not visible anymore in the session registry. | |
2563 | */ | |
2564 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2565 | ua_chan->tracing_channel_id); | |
2566 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2567 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2568 | goto error; |
2569 | } | |
2570 | ||
2571 | /* | |
2572 | * Setup the streams and add it to the session registry. | |
2573 | */ | |
2574 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2575 | if (ret < 0) { | |
f14256d6 MD |
2576 | ERR("Error setting up UST channel \"%s\"", |
2577 | ua_chan->name); | |
7972aab2 DG |
2578 | goto error; |
2579 | } | |
2580 | ||
2581 | } | |
2582 | ||
2583 | /* Send buffers to the application. */ | |
2584 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e | 2585 | if (ret < 0) { |
f14256d6 MD |
2586 | /* |
2587 | * Don't report error to the console, since it may be | |
2588 | * caused by application concurrently exiting. | |
2589 | */ | |
9730260e DG |
2590 | goto error; |
2591 | } | |
2592 | ||
9730260e DG |
2593 | error: |
2594 | return ret; | |
2595 | } | |
2596 | ||
78f0bacd | 2597 | /* |
7972aab2 DG |
2598 | * Create and send to the application the created buffers with per PID buffers. |
2599 | * | |
2600 | * Return 0 on success else a negative value. | |
78f0bacd | 2601 | */ |
7972aab2 DG |
2602 | static int create_channel_per_pid(struct ust_app *app, |
2603 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2604 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2605 | { |
8535a6d9 | 2606 | int ret; |
7972aab2 | 2607 | struct ust_registry_session *registry; |
78f0bacd | 2608 | |
7972aab2 DG |
2609 | assert(app); |
2610 | assert(usess); | |
2611 | assert(ua_sess); | |
2612 | assert(ua_chan); | |
2613 | ||
2614 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2615 | ||
2616 | rcu_read_lock(); | |
2617 | ||
2618 | registry = get_session_registry(ua_sess); | |
2619 | assert(registry); | |
2620 | ||
2621 | /* Create and add a new channel registry to session. */ | |
2622 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2623 | if (ret < 0) { |
f14256d6 MD |
2624 | ERR("Error creating the UST channel \"%s\" registry instance", |
2625 | ua_chan->name); | |
78f0bacd DG |
2626 | goto error; |
2627 | } | |
2628 | ||
7972aab2 DG |
2629 | /* Create and get channel on the consumer side. */ |
2630 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2631 | app->bits_per_long, registry); | |
2632 | if (ret < 0) { | |
f14256d6 MD |
2633 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2634 | ua_chan->name); | |
7972aab2 DG |
2635 | goto error; |
2636 | } | |
2637 | ||
2638 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2639 | if (ret < 0) { | |
f14256d6 MD |
2640 | /* |
2641 | * Don't report error to the console, since it may be | |
2642 | * caused by application concurrently exiting. | |
2643 | */ | |
7972aab2 DG |
2644 | goto error; |
2645 | } | |
8535a6d9 | 2646 | |
78f0bacd | 2647 | error: |
7972aab2 | 2648 | rcu_read_unlock(); |
78f0bacd DG |
2649 | return ret; |
2650 | } | |
2651 | ||
2652 | /* | |
7972aab2 DG |
2653 | * From an already allocated ust app channel, create the channel buffers if |
2654 | * need and send it to the application. This MUST be called with a RCU read | |
2655 | * side lock acquired. | |
2656 | * | |
2657 | * Return 0 on success or else a negative value. | |
78f0bacd | 2658 | */ |
7972aab2 DG |
2659 | static int do_create_channel(struct ust_app *app, |
2660 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2661 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2662 | { |
7972aab2 | 2663 | int ret; |
78f0bacd | 2664 | |
7972aab2 DG |
2665 | assert(app); |
2666 | assert(usess); | |
2667 | assert(ua_sess); | |
2668 | assert(ua_chan); | |
2669 | ||
2670 | /* Handle buffer type before sending the channel to the application. */ | |
2671 | switch (usess->buffer_type) { | |
2672 | case LTTNG_BUFFER_PER_UID: | |
2673 | { | |
2674 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2675 | if (ret < 0) { | |
2676 | goto error; | |
2677 | } | |
2678 | break; | |
2679 | } | |
2680 | case LTTNG_BUFFER_PER_PID: | |
2681 | { | |
2682 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2683 | if (ret < 0) { | |
2684 | goto error; | |
2685 | } | |
2686 | break; | |
2687 | } | |
2688 | default: | |
2689 | assert(0); | |
2690 | ret = -EINVAL; | |
78f0bacd DG |
2691 | goto error; |
2692 | } | |
2693 | ||
7972aab2 DG |
2694 | /* Initialize ust objd object using the received handle and add it. */ |
2695 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2696 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2697 | |
7972aab2 DG |
2698 | /* If channel is not enabled, disable it on the tracer */ |
2699 | if (!ua_chan->enabled) { | |
2700 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2701 | if (ret < 0) { | |
2702 | goto error; | |
2703 | } | |
78f0bacd DG |
2704 | } |
2705 | ||
2706 | error: | |
2707 | return ret; | |
2708 | } | |
2709 | ||
284d8f55 | 2710 | /* |
4d710ac2 DG |
2711 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2712 | * newly created channel if not NULL. | |
d0b96690 | 2713 | * |
36b588ed | 2714 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2715 | * |
2716 | * Return 0 on success or else a negative value. | |
284d8f55 | 2717 | */ |
4d710ac2 DG |
2718 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2719 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2720 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2721 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2722 | { |
2723 | int ret = 0; | |
bec39940 DG |
2724 | struct lttng_ht_iter iter; |
2725 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2726 | struct ust_app_channel *ua_chan; |
2727 | ||
2728 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2729 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2730 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2731 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2732 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2733 | goto end; |
5b4a0ec0 DG |
2734 | } |
2735 | ||
d0b96690 | 2736 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2737 | if (ua_chan == NULL) { |
2738 | /* Only malloc can fail here */ | |
4d710ac2 | 2739 | ret = -ENOMEM; |
094d1690 | 2740 | goto error_alloc; |
fc34caaa DG |
2741 | } |
2742 | shadow_copy_channel(ua_chan, uchan); | |
2743 | ||
ffe60014 DG |
2744 | /* Set channel type. */ |
2745 | ua_chan->attr.type = type; | |
2746 | ||
7972aab2 | 2747 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2748 | if (ret < 0) { |
2749 | goto error; | |
2750 | } | |
2751 | ||
fc34caaa | 2752 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2753 | app->pid); |
fc34caaa | 2754 | |
d0b96690 DG |
2755 | /* Only add the channel if successful on the tracer side. */ |
2756 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2757 | ||
fc34caaa | 2758 | end: |
4d710ac2 DG |
2759 | if (ua_chanp) { |
2760 | *ua_chanp = ua_chan; | |
2761 | } | |
2762 | ||
2763 | /* Everything went well. */ | |
2764 | return 0; | |
5b4a0ec0 DG |
2765 | |
2766 | error: | |
d0b96690 | 2767 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2768 | error_alloc: |
4d710ac2 | 2769 | return ret; |
5b4a0ec0 DG |
2770 | } |
2771 | ||
2772 | /* | |
2773 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2774 | * |
2775 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2776 | */ |
edb67388 DG |
2777 | static |
2778 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2779 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2780 | struct ust_app *app) | |
284d8f55 | 2781 | { |
edb67388 | 2782 | int ret = 0; |
5b4a0ec0 | 2783 | struct ust_app_event *ua_event; |
284d8f55 | 2784 | |
5b4a0ec0 | 2785 | /* Get event node */ |
18eace3b | 2786 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 2787 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 2788 | if (ua_event != NULL) { |
fc34caaa | 2789 | ret = -EEXIST; |
edb67388 DG |
2790 | goto end; |
2791 | } | |
5b4a0ec0 | 2792 | |
edb67388 DG |
2793 | /* Does not exist so create one */ |
2794 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2795 | if (ua_event == NULL) { | |
2796 | /* Only malloc can failed so something is really wrong */ | |
2797 | ret = -ENOMEM; | |
fc34caaa | 2798 | goto end; |
5b4a0ec0 | 2799 | } |
edb67388 | 2800 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2801 | |
edb67388 | 2802 | /* Create it on the tracer side */ |
5b4a0ec0 | 2803 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2804 | if (ret < 0) { |
fc34caaa | 2805 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2806 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2807 | goto error; |
2808 | } | |
2809 | ||
d0b96690 | 2810 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2811 | |
fc34caaa | 2812 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2813 | app->pid); |
7f79d3a1 | 2814 | |
edb67388 | 2815 | end: |
fc34caaa DG |
2816 | return ret; |
2817 | ||
5b4a0ec0 | 2818 | error: |
fc34caaa DG |
2819 | /* Valid. Calling here is already in a read side lock */ |
2820 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2821 | return ret; |
5b4a0ec0 DG |
2822 | } |
2823 | ||
2824 | /* | |
2825 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2826 | * |
7972aab2 | 2827 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2828 | */ |
2829 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 2830 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
2831 | { |
2832 | int ret = 0; | |
ffe60014 | 2833 | struct ust_app_channel *metadata; |
d88aee68 | 2834 | struct consumer_socket *socket; |
7972aab2 | 2835 | struct ust_registry_session *registry; |
5b4a0ec0 | 2836 | |
ffe60014 DG |
2837 | assert(ua_sess); |
2838 | assert(app); | |
d88aee68 | 2839 | assert(consumer); |
5b4a0ec0 | 2840 | |
7972aab2 DG |
2841 | registry = get_session_registry(ua_sess); |
2842 | assert(registry); | |
2843 | ||
1b532a60 DG |
2844 | /* Metadata already exists for this registry or it was closed previously */ |
2845 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2846 | ret = 0; |
2847 | goto error; | |
5b4a0ec0 DG |
2848 | } |
2849 | ||
ffe60014 | 2850 | /* Allocate UST metadata */ |
d0b96690 | 2851 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2852 | if (!metadata) { |
2853 | /* malloc() failed */ | |
2854 | ret = -ENOMEM; | |
2855 | goto error; | |
2856 | } | |
5b4a0ec0 | 2857 | |
ad7a9107 | 2858 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 2859 | |
7972aab2 DG |
2860 | /* Need one fd for the channel. */ |
2861 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2862 | if (ret < 0) { | |
2863 | ERR("Exhausted number of available FD upon create metadata"); | |
2864 | goto error; | |
2865 | } | |
2866 | ||
4dc3dfc5 DG |
2867 | /* Get the right consumer socket for the application. */ |
2868 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2869 | if (!socket) { | |
2870 | ret = -EINVAL; | |
2871 | goto error_consumer; | |
2872 | } | |
2873 | ||
331744e3 JD |
2874 | /* |
2875 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2876 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2877 | * consumer requesting the metadata and the ask_channel call on our side | |
2878 | * did not returned yet. | |
2879 | */ | |
2880 | registry->metadata_key = metadata->key; | |
2881 | ||
d88aee68 DG |
2882 | /* |
2883 | * Ask the metadata channel creation to the consumer. The metadata object | |
2884 | * will be created by the consumer and kept their. However, the stream is | |
2885 | * never added or monitored until we do a first push metadata to the | |
2886 | * consumer. | |
2887 | */ | |
7972aab2 DG |
2888 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2889 | registry); | |
d88aee68 | 2890 | if (ret < 0) { |
f2a444f1 DG |
2891 | /* Nullify the metadata key so we don't try to close it later on. */ |
2892 | registry->metadata_key = 0; | |
d88aee68 DG |
2893 | goto error_consumer; |
2894 | } | |
2895 | ||
2896 | /* | |
2897 | * The setup command will make the metadata stream be sent to the relayd, | |
2898 | * if applicable, and the thread managing the metadatas. This is important | |
2899 | * because after this point, if an error occurs, the only way the stream | |
2900 | * can be deleted is to be monitored in the consumer. | |
2901 | */ | |
7972aab2 | 2902 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2903 | if (ret < 0) { |
f2a444f1 DG |
2904 | /* Nullify the metadata key so we don't try to close it later on. */ |
2905 | registry->metadata_key = 0; | |
d88aee68 | 2906 | goto error_consumer; |
5b4a0ec0 DG |
2907 | } |
2908 | ||
7972aab2 DG |
2909 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2910 | metadata->key, app->pid); | |
5b4a0ec0 | 2911 | |
d88aee68 | 2912 | error_consumer: |
b80f0b6c | 2913 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2914 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2915 | error: |
ffe60014 | 2916 | return ret; |
5b4a0ec0 DG |
2917 | } |
2918 | ||
5b4a0ec0 | 2919 | /* |
d88aee68 DG |
2920 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2921 | * acquired before calling this function. | |
5b4a0ec0 DG |
2922 | */ |
2923 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2924 | { | |
d88aee68 | 2925 | struct ust_app *app = NULL; |
bec39940 DG |
2926 | struct lttng_ht_node_ulong *node; |
2927 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2928 | |
bec39940 DG |
2929 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2930 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2931 | if (node == NULL) { |
2932 | DBG2("UST app no found with pid %d", pid); | |
2933 | goto error; | |
2934 | } | |
5b4a0ec0 DG |
2935 | |
2936 | DBG2("Found UST app by pid %d", pid); | |
2937 | ||
d88aee68 | 2938 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2939 | |
2940 | error: | |
d88aee68 | 2941 | return app; |
5b4a0ec0 DG |
2942 | } |
2943 | ||
d88aee68 DG |
2944 | /* |
2945 | * Allocate and init an UST app object using the registration information and | |
2946 | * the command socket. This is called when the command socket connects to the | |
2947 | * session daemon. | |
2948 | * | |
2949 | * The object is returned on success or else NULL. | |
2950 | */ | |
d0b96690 | 2951 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2952 | { |
d0b96690 DG |
2953 | struct ust_app *lta = NULL; |
2954 | ||
2955 | assert(msg); | |
2956 | assert(sock >= 0); | |
2957 | ||
2958 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2959 | |
173af62f DG |
2960 | if ((msg->bits_per_long == 64 && |
2961 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2962 | || (msg->bits_per_long == 32 && | |
2963 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2964 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2965 | "%d-bit long, but no consumerd for this size is available.\n", |
2966 | msg->name, msg->pid, msg->bits_per_long); | |
2967 | goto error; | |
3f2c5fcc | 2968 | } |
d0b96690 | 2969 | |
5b4a0ec0 DG |
2970 | lta = zmalloc(sizeof(struct ust_app)); |
2971 | if (lta == NULL) { | |
2972 | PERROR("malloc"); | |
d0b96690 | 2973 | goto error; |
5b4a0ec0 DG |
2974 | } |
2975 | ||
2976 | lta->ppid = msg->ppid; | |
2977 | lta->uid = msg->uid; | |
2978 | lta->gid = msg->gid; | |
d0b96690 | 2979 | |
7753dea8 | 2980 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2981 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2982 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2983 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2984 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2985 | lta->long_alignment = msg->long_alignment; | |
2986 | lta->byte_order = msg->byte_order; | |
2987 | ||
5b4a0ec0 DG |
2988 | lta->v_major = msg->major; |
2989 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 2990 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
2991 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2992 | lta->notify_sock = -1; | |
d88aee68 DG |
2993 | |
2994 | /* Copy name and make sure it's NULL terminated. */ | |
2995 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2996 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2997 | ||
2998 | /* | |
2999 | * Before this can be called, when receiving the registration information, | |
3000 | * the application compatibility is checked. So, at this point, the | |
3001 | * application can work with this session daemon. | |
3002 | */ | |
d0b96690 | 3003 | lta->compatible = 1; |
5b4a0ec0 | 3004 | |
852d0037 | 3005 | lta->pid = msg->pid; |
d0b96690 | 3006 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3007 | lta->sock = sock; |
d0b96690 | 3008 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3009 | |
d42f20df DG |
3010 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
3011 | ||
d0b96690 DG |
3012 | error: |
3013 | return lta; | |
3014 | } | |
3015 | ||
d88aee68 DG |
3016 | /* |
3017 | * For a given application object, add it to every hash table. | |
3018 | */ | |
d0b96690 DG |
3019 | void ust_app_add(struct ust_app *app) |
3020 | { | |
3021 | assert(app); | |
3022 | assert(app->notify_sock >= 0); | |
3023 | ||
5b4a0ec0 | 3024 | rcu_read_lock(); |
852d0037 DG |
3025 | |
3026 | /* | |
3027 | * On a re-registration, we want to kick out the previous registration of | |
3028 | * that pid | |
3029 | */ | |
d0b96690 | 3030 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3031 | |
3032 | /* | |
3033 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3034 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3035 | * already in the table. | |
3036 | */ | |
d0b96690 | 3037 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3038 | |
d0b96690 DG |
3039 | /* Add application to the notify socket hash table. */ |
3040 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3041 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3042 | |
d0b96690 | 3043 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3044 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3045 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3046 | app->v_minor); | |
5b4a0ec0 | 3047 | |
d0b96690 DG |
3048 | rcu_read_unlock(); |
3049 | } | |
3050 | ||
d88aee68 DG |
3051 | /* |
3052 | * Set the application version into the object. | |
3053 | * | |
3054 | * Return 0 on success else a negative value either an errno code or a | |
3055 | * LTTng-UST error code. | |
3056 | */ | |
d0b96690 DG |
3057 | int ust_app_version(struct ust_app *app) |
3058 | { | |
d88aee68 DG |
3059 | int ret; |
3060 | ||
d0b96690 | 3061 | assert(app); |
d88aee68 DG |
3062 | |
3063 | ret = ustctl_tracer_version(app->sock, &app->version); | |
3064 | if (ret < 0) { | |
3065 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3066 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3067 | } else { |
5368d366 | 3068 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3069 | } |
3070 | } | |
3071 | ||
3072 | return ret; | |
5b4a0ec0 DG |
3073 | } |
3074 | ||
3075 | /* | |
3076 | * Unregister app by removing it from the global traceable app list and freeing | |
3077 | * the data struct. | |
3078 | * | |
3079 | * The socket is already closed at this point so no close to sock. | |
3080 | */ | |
3081 | void ust_app_unregister(int sock) | |
3082 | { | |
3083 | struct ust_app *lta; | |
bec39940 DG |
3084 | struct lttng_ht_node_ulong *node; |
3085 | struct lttng_ht_iter iter; | |
d42f20df | 3086 | struct ust_app_session *ua_sess; |
525b0740 | 3087 | int ret; |
5b4a0ec0 DG |
3088 | |
3089 | rcu_read_lock(); | |
886459c6 | 3090 | |
5b4a0ec0 | 3091 | /* Get the node reference for a call_rcu */ |
852d0037 | 3092 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 3093 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 3094 | assert(node); |
284d8f55 | 3095 | |
852d0037 | 3096 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3097 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3098 | ||
886459c6 | 3099 | /* Remove application from PID hash table */ |
852d0037 DG |
3100 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
3101 | assert(!ret); | |
3102 | ||
d88aee68 DG |
3103 | /* |
3104 | * Remove application from notify hash table. The thread handling the | |
3105 | * notify socket could have deleted the node so ignore on error because | |
3106 | * either way it's valid. The close of that socket is handled by the other | |
3107 | * thread. | |
3108 | */ | |
d0b96690 | 3109 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 3110 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 3111 | |
5b98a774 DG |
3112 | /* |
3113 | * Ignore return value since the node might have been removed before by an | |
3114 | * add replace during app registration because the PID can be reassigned by | |
3115 | * the OS. | |
3116 | */ | |
d0b96690 | 3117 | iter.iter.node = <a->pid_n.node; |
bec39940 | 3118 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
3119 | if (ret) { |
3120 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3121 | lta->pid); | |
3122 | } | |
852d0037 | 3123 | |
d42f20df DG |
3124 | /* Remove sessions so they are not visible during deletion.*/ |
3125 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
3126 | node.node) { | |
7972aab2 DG |
3127 | struct ust_registry_session *registry; |
3128 | ||
d42f20df DG |
3129 | ret = lttng_ht_del(lta->sessions, &iter); |
3130 | if (ret) { | |
3131 | /* The session was already removed so scheduled for teardown. */ | |
3132 | continue; | |
3133 | } | |
3134 | ||
3135 | /* | |
3136 | * Add session to list for teardown. This is safe since at this point we | |
3137 | * are the only one using this list. | |
3138 | */ | |
d88aee68 DG |
3139 | pthread_mutex_lock(&ua_sess->lock); |
3140 | ||
3141 | /* | |
3142 | * Normally, this is done in the delete session process which is | |
3143 | * executed in the call rcu below. However, upon registration we can't | |
3144 | * afford to wait for the grace period before pushing data or else the | |
3145 | * data pending feature can race between the unregistration and stop | |
3146 | * command where the data pending command is sent *before* the grace | |
3147 | * period ended. | |
3148 | * | |
3149 | * The close metadata below nullifies the metadata pointer in the | |
3150 | * session so the delete session will NOT push/close a second time. | |
3151 | */ | |
7972aab2 | 3152 | registry = get_session_registry(ua_sess); |
1b532a60 | 3153 | if (registry && !registry->metadata_closed) { |
7972aab2 DG |
3154 | /* Push metadata for application before freeing the application. */ |
3155 | (void) push_metadata(registry, ua_sess->consumer); | |
3156 | ||
3157 | /* | |
3158 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3159 | * metadata only on destroy trace session in this case. Also, the |
3160 | * previous push metadata could have flag the metadata registry to | |
3161 | * close so don't send a close command if closed. | |
7972aab2 | 3162 | */ |
1b532a60 DG |
3163 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
3164 | !registry->metadata_closed) { | |
7972aab2 DG |
3165 | /* And ask to close it for this session registry. */ |
3166 | (void) close_metadata(registry, ua_sess->consumer); | |
3167 | } | |
3168 | } | |
d88aee68 | 3169 | |
d42f20df | 3170 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 3171 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3172 | } |
3173 | ||
852d0037 DG |
3174 | /* Free memory */ |
3175 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3176 | ||
5b4a0ec0 DG |
3177 | rcu_read_unlock(); |
3178 | return; | |
284d8f55 DG |
3179 | } |
3180 | ||
5b4a0ec0 DG |
3181 | /* |
3182 | * Fill events array with all events name of all registered apps. | |
3183 | */ | |
3184 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3185 | { |
5b4a0ec0 DG |
3186 | int ret, handle; |
3187 | size_t nbmem, count = 0; | |
bec39940 | 3188 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3189 | struct ust_app *app; |
c617c0c6 | 3190 | struct lttng_event *tmp_event; |
421cb601 | 3191 | |
5b4a0ec0 | 3192 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3193 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3194 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3195 | PERROR("zmalloc ust app events"); |
3196 | ret = -ENOMEM; | |
421cb601 DG |
3197 | goto error; |
3198 | } | |
3199 | ||
5b4a0ec0 | 3200 | rcu_read_lock(); |
421cb601 | 3201 | |
852d0037 | 3202 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3203 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3204 | |
840cb59c | 3205 | health_code_update(); |
86acf0da | 3206 | |
e0c7ec2b DG |
3207 | if (!app->compatible) { |
3208 | /* | |
3209 | * TODO: In time, we should notice the caller of this error by | |
3210 | * telling him that this is a version error. | |
3211 | */ | |
3212 | continue; | |
3213 | } | |
852d0037 | 3214 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3215 | if (handle < 0) { |
ffe60014 DG |
3216 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3217 | ERR("UST app list events getting handle failed for app pid %d", | |
3218 | app->pid); | |
3219 | } | |
5b4a0ec0 DG |
3220 | continue; |
3221 | } | |
421cb601 | 3222 | |
852d0037 | 3223 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3224 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3225 | /* Handle ustctl error. */ |
3226 | if (ret < 0) { | |
a2ba1ab0 | 3227 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3228 | ERR("UST app tp list get failed for app %d with ret %d", |
3229 | app->sock, ret); | |
3230 | } else { | |
3231 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3232 | /* |
3233 | * This is normal behavior, an application can die during the | |
3234 | * creation process. Don't report an error so the execution can | |
3235 | * continue normally. Continue normal execution. | |
3236 | */ | |
3237 | break; | |
ffe60014 | 3238 | } |
98f595d4 | 3239 | free(tmp_event); |
ffe60014 DG |
3240 | goto rcu_error; |
3241 | } | |
3242 | ||
840cb59c | 3243 | health_code_update(); |
815564d8 | 3244 | if (count >= nbmem) { |
d7b3776f | 3245 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3246 | struct lttng_event *new_tmp_event; |
3247 | size_t new_nbmem; | |
3248 | ||
3249 | new_nbmem = nbmem << 1; | |
3250 | DBG2("Reallocating event list from %zu to %zu entries", | |
3251 | nbmem, new_nbmem); | |
3252 | new_tmp_event = realloc(tmp_event, | |
3253 | new_nbmem * sizeof(struct lttng_event)); | |
3254 | if (new_tmp_event == NULL) { | |
5b4a0ec0 | 3255 | PERROR("realloc ust app events"); |
c617c0c6 | 3256 | free(tmp_event); |
5b4a0ec0 DG |
3257 | ret = -ENOMEM; |
3258 | goto rcu_error; | |
3259 | } | |
53efb85a MD |
3260 | /* Zero the new memory */ |
3261 | memset(new_tmp_event + nbmem, 0, | |
3262 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3263 | nbmem = new_nbmem; | |
3264 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3265 | } |
c617c0c6 MD |
3266 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3267 | tmp_event[count].loglevel = uiter.loglevel; | |
3268 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3269 | tmp_event[count].pid = app->pid; | |
3270 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3271 | count++; |
421cb601 | 3272 | } |
421cb601 DG |
3273 | } |
3274 | ||
5b4a0ec0 | 3275 | ret = count; |
c617c0c6 | 3276 | *events = tmp_event; |
421cb601 | 3277 | |
5b4a0ec0 | 3278 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3279 | |
5b4a0ec0 DG |
3280 | rcu_error: |
3281 | rcu_read_unlock(); | |
421cb601 | 3282 | error: |
840cb59c | 3283 | health_code_update(); |
5b4a0ec0 | 3284 | return ret; |
421cb601 DG |
3285 | } |
3286 | ||
f37d259d MD |
3287 | /* |
3288 | * Fill events array with all events name of all registered apps. | |
3289 | */ | |
3290 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3291 | { | |
3292 | int ret, handle; | |
3293 | size_t nbmem, count = 0; | |
3294 | struct lttng_ht_iter iter; | |
3295 | struct ust_app *app; | |
c617c0c6 | 3296 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3297 | |
3298 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3299 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3300 | if (tmp_event == NULL) { | |
f37d259d MD |
3301 | PERROR("zmalloc ust app event fields"); |
3302 | ret = -ENOMEM; | |
3303 | goto error; | |
3304 | } | |
3305 | ||
3306 | rcu_read_lock(); | |
3307 | ||
3308 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3309 | struct lttng_ust_field_iter uiter; | |
3310 | ||
840cb59c | 3311 | health_code_update(); |
86acf0da | 3312 | |
f37d259d MD |
3313 | if (!app->compatible) { |
3314 | /* | |
3315 | * TODO: In time, we should notice the caller of this error by | |
3316 | * telling him that this is a version error. | |
3317 | */ | |
3318 | continue; | |
3319 | } | |
3320 | handle = ustctl_tracepoint_field_list(app->sock); | |
3321 | if (handle < 0) { | |
ffe60014 DG |
3322 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3323 | ERR("UST app list field getting handle failed for app pid %d", | |
3324 | app->pid); | |
3325 | } | |
f37d259d MD |
3326 | continue; |
3327 | } | |
3328 | ||
3329 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3330 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3331 | /* Handle ustctl error. */ |
3332 | if (ret < 0) { | |
a2ba1ab0 | 3333 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3334 | ERR("UST app tp list field failed for app %d with ret %d", |
3335 | app->sock, ret); | |
3336 | } else { | |
3337 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3338 | /* |
3339 | * This is normal behavior, an application can die during the | |
3340 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3341 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3342 | */ |
3343 | break; | |
ffe60014 | 3344 | } |
98f595d4 | 3345 | free(tmp_event); |
ffe60014 DG |
3346 | goto rcu_error; |
3347 | } | |
3348 | ||
840cb59c | 3349 | health_code_update(); |
f37d259d | 3350 | if (count >= nbmem) { |
d7b3776f | 3351 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3352 | struct lttng_event_field *new_tmp_event; |
3353 | size_t new_nbmem; | |
3354 | ||
3355 | new_nbmem = nbmem << 1; | |
3356 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3357 | nbmem, new_nbmem); | |
3358 | new_tmp_event = realloc(tmp_event, | |
3359 | new_nbmem * sizeof(struct lttng_event_field)); | |
3360 | if (new_tmp_event == NULL) { | |
f37d259d | 3361 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3362 | free(tmp_event); |
f37d259d MD |
3363 | ret = -ENOMEM; |
3364 | goto rcu_error; | |
3365 | } | |
53efb85a MD |
3366 | /* Zero the new memory */ |
3367 | memset(new_tmp_event + nbmem, 0, | |
3368 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3369 | nbmem = new_nbmem; | |
3370 | tmp_event = new_tmp_event; | |
f37d259d | 3371 | } |
f37d259d | 3372 | |
c617c0c6 | 3373 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3374 | /* Mapping between these enums matches 1 to 1. */ |
3375 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3376 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3377 | |
c617c0c6 MD |
3378 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3379 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3380 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3381 | tmp_event[count].event.pid = app->pid; |
3382 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3383 | count++; |
3384 | } | |
3385 | } | |
3386 | ||
3387 | ret = count; | |
c617c0c6 | 3388 | *fields = tmp_event; |
f37d259d MD |
3389 | |
3390 | DBG2("UST app list event fields done (%zu events)", count); | |
3391 | ||
3392 | rcu_error: | |
3393 | rcu_read_unlock(); | |
3394 | error: | |
840cb59c | 3395 | health_code_update(); |
f37d259d MD |
3396 | return ret; |
3397 | } | |
3398 | ||
5b4a0ec0 DG |
3399 | /* |
3400 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3401 | * |
3402 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3403 | */ |
3404 | void ust_app_clean_list(void) | |
421cb601 | 3405 | { |
5b4a0ec0 | 3406 | int ret; |
659ed79f | 3407 | struct ust_app *app; |
bec39940 | 3408 | struct lttng_ht_iter iter; |
421cb601 | 3409 | |
5b4a0ec0 | 3410 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3411 | |
5b4a0ec0 | 3412 | rcu_read_lock(); |
421cb601 | 3413 | |
659ed79f | 3414 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3415 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3416 | assert(!ret); |
659ed79f | 3417 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3418 | } |
3419 | ||
852d0037 | 3420 | /* Cleanup socket hash table */ |
659ed79f DG |
3421 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3422 | sock_n.node) { | |
852d0037 | 3423 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3424 | assert(!ret); |
3425 | } | |
852d0037 | 3426 | |
d88aee68 DG |
3427 | /* Cleanup notify socket hash table */ |
3428 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3429 | notify_sock_n.node) { | |
3430 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3431 | assert(!ret); | |
3432 | } | |
36b588ed | 3433 | rcu_read_unlock(); |
d88aee68 | 3434 | |
bec39940 | 3435 | /* Destroy is done only when the ht is empty */ |
0b2dc8df MD |
3436 | ht_cleanup_push(ust_app_ht); |
3437 | ht_cleanup_push(ust_app_ht_by_sock); | |
3438 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
5b4a0ec0 DG |
3439 | } |
3440 | ||
3441 | /* | |
3442 | * Init UST app hash table. | |
3443 | */ | |
3444 | void ust_app_ht_alloc(void) | |
3445 | { | |
bec39940 | 3446 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3447 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3448 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3449 | } |
3450 | ||
78f0bacd DG |
3451 | /* |
3452 | * For a specific UST session, disable the channel for all registered apps. | |
3453 | */ | |
35a9059d | 3454 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3455 | struct ltt_ust_channel *uchan) |
3456 | { | |
3457 | int ret = 0; | |
bec39940 DG |
3458 | struct lttng_ht_iter iter; |
3459 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3460 | struct ust_app *app; |
3461 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3462 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3463 | |
3464 | if (usess == NULL || uchan == NULL) { | |
3465 | ERR("Disabling UST global channel with NULL values"); | |
3466 | ret = -1; | |
3467 | goto error; | |
3468 | } | |
3469 | ||
d9bf3ca4 | 3470 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3471 | uchan->name, usess->id); |
78f0bacd DG |
3472 | |
3473 | rcu_read_lock(); | |
3474 | ||
3475 | /* For every registered applications */ | |
852d0037 | 3476 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3477 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3478 | if (!app->compatible) { |
3479 | /* | |
3480 | * TODO: In time, we should notice the caller of this error by | |
3481 | * telling him that this is a version error. | |
3482 | */ | |
3483 | continue; | |
3484 | } | |
78f0bacd DG |
3485 | ua_sess = lookup_session_by_app(usess, app); |
3486 | if (ua_sess == NULL) { | |
3487 | continue; | |
3488 | } | |
3489 | ||
8535a6d9 | 3490 | /* Get channel */ |
bec39940 DG |
3491 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3492 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3493 | /* If the session if found for the app, the channel must be there */ |
3494 | assert(ua_chan_node); | |
3495 | ||
3496 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3497 | /* The channel must not be already disabled */ | |
3498 | assert(ua_chan->enabled == 1); | |
3499 | ||
3500 | /* Disable channel onto application */ | |
3501 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3502 | if (ret < 0) { |
3503 | /* XXX: We might want to report this error at some point... */ | |
3504 | continue; | |
3505 | } | |
3506 | } | |
3507 | ||
3508 | rcu_read_unlock(); | |
3509 | ||
3510 | error: | |
3511 | return ret; | |
3512 | } | |
3513 | ||
3514 | /* | |
3515 | * For a specific UST session, enable the channel for all registered apps. | |
3516 | */ | |
35a9059d | 3517 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3518 | struct ltt_ust_channel *uchan) |
3519 | { | |
3520 | int ret = 0; | |
bec39940 | 3521 | struct lttng_ht_iter iter; |
78f0bacd DG |
3522 | struct ust_app *app; |
3523 | struct ust_app_session *ua_sess; | |
3524 | ||
3525 | if (usess == NULL || uchan == NULL) { | |
3526 | ERR("Adding UST global channel to NULL values"); | |
3527 | ret = -1; | |
3528 | goto error; | |
3529 | } | |
3530 | ||
d9bf3ca4 | 3531 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3532 | uchan->name, usess->id); |
78f0bacd DG |
3533 | |
3534 | rcu_read_lock(); | |
3535 | ||
3536 | /* For every registered applications */ | |
852d0037 | 3537 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3538 | if (!app->compatible) { |
3539 | /* | |
3540 | * TODO: In time, we should notice the caller of this error by | |
3541 | * telling him that this is a version error. | |
3542 | */ | |
3543 | continue; | |
3544 | } | |
78f0bacd DG |
3545 | ua_sess = lookup_session_by_app(usess, app); |
3546 | if (ua_sess == NULL) { | |
3547 | continue; | |
3548 | } | |
3549 | ||
3550 | /* Enable channel onto application */ | |
3551 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3552 | if (ret < 0) { | |
3553 | /* XXX: We might want to report this error at some point... */ | |
3554 | continue; | |
3555 | } | |
3556 | } | |
3557 | ||
3558 | rcu_read_unlock(); | |
3559 | ||
3560 | error: | |
3561 | return ret; | |
3562 | } | |
3563 | ||
b0a40d28 DG |
3564 | /* |
3565 | * Disable an event in a channel and for a specific session. | |
3566 | */ | |
35a9059d DG |
3567 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3568 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3569 | { |
3570 | int ret = 0; | |
bec39940 DG |
3571 | struct lttng_ht_iter iter, uiter; |
3572 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3573 | struct ust_app *app; |
3574 | struct ust_app_session *ua_sess; | |
3575 | struct ust_app_channel *ua_chan; | |
3576 | struct ust_app_event *ua_event; | |
3577 | ||
3578 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3579 | "%s for session id %" PRIu64, |
3580 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3581 | |
3582 | rcu_read_lock(); | |
3583 | ||
3584 | /* For all registered applications */ | |
852d0037 | 3585 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3586 | if (!app->compatible) { |
3587 | /* | |
3588 | * TODO: In time, we should notice the caller of this error by | |
3589 | * telling him that this is a version error. | |
3590 | */ | |
3591 | continue; | |
3592 | } | |
b0a40d28 DG |
3593 | ua_sess = lookup_session_by_app(usess, app); |
3594 | if (ua_sess == NULL) { | |
3595 | /* Next app */ | |
3596 | continue; | |
3597 | } | |
3598 | ||
3599 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3600 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3601 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3602 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3603 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3604 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3605 | continue; |
3606 | } | |
3607 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3608 | ||
bec39940 DG |
3609 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3610 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3611 | if (ua_event_node == NULL) { |
3612 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3613 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3614 | continue; |
3615 | } | |
3616 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3617 | ||
7f79d3a1 | 3618 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3619 | if (ret < 0) { |
3620 | /* XXX: Report error someday... */ | |
3621 | continue; | |
3622 | } | |
3623 | } | |
3624 | ||
3625 | rcu_read_unlock(); | |
3626 | ||
3627 | return ret; | |
3628 | } | |
3629 | ||
421cb601 | 3630 | /* |
5b4a0ec0 | 3631 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3632 | */ |
35a9059d | 3633 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3634 | struct ltt_ust_channel *uchan) |
3635 | { | |
3d8ca23b | 3636 | int ret = 0, created; |
bec39940 | 3637 | struct lttng_ht_iter iter; |
48842b30 | 3638 | struct ust_app *app; |
3d8ca23b | 3639 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3640 | |
fc34caaa DG |
3641 | /* Very wrong code flow */ |
3642 | assert(usess); | |
3643 | assert(uchan); | |
421cb601 | 3644 | |
d9bf3ca4 | 3645 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3646 | uchan->name, usess->id); |
48842b30 DG |
3647 | |
3648 | rcu_read_lock(); | |
421cb601 | 3649 | |
5b4a0ec0 | 3650 | /* For every registered applications */ |
852d0037 | 3651 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3652 | if (!app->compatible) { |
3653 | /* | |
3654 | * TODO: In time, we should notice the caller of this error by | |
3655 | * telling him that this is a version error. | |
3656 | */ | |
3657 | continue; | |
3658 | } | |
edb67388 DG |
3659 | /* |
3660 | * Create session on the tracer side and add it to app session HT. Note | |
3661 | * that if session exist, it will simply return a pointer to the ust | |
3662 | * app session. | |
3663 | */ | |
3d8ca23b DG |
3664 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3665 | if (ret < 0) { | |
3666 | switch (ret) { | |
3667 | case -ENOTCONN: | |
3668 | /* | |
3669 | * The application's socket is not valid. Either a bad socket | |
3670 | * or a timeout on it. We can't inform the caller that for a | |
3671 | * specific app, the session failed so lets continue here. | |
3672 | */ | |
3673 | continue; | |
3674 | case -ENOMEM: | |
3675 | default: | |
3676 | goto error_rcu_unlock; | |
3677 | } | |
48842b30 | 3678 | } |
3d8ca23b | 3679 | assert(ua_sess); |
48842b30 | 3680 | |
d0b96690 | 3681 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3682 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3683 | sizeof(uchan->name))) { | |
ad7a9107 DG |
3684 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
3685 | ret = 0; | |
d65d2de8 DG |
3686 | } else { |
3687 | /* Create channel onto application. We don't need the chan ref. */ | |
3688 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3689 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3690 | } | |
d0b96690 | 3691 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3692 | if (ret < 0) { |
3693 | if (ret == -ENOMEM) { | |
3694 | /* No more memory is a fatal error. Stop right now. */ | |
3695 | goto error_rcu_unlock; | |
3696 | } | |
3697 | /* Cleanup the created session if it's the case. */ | |
3698 | if (created) { | |
d0b96690 | 3699 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3700 | } |
48842b30 | 3701 | } |
48842b30 | 3702 | } |
5b4a0ec0 | 3703 | |
95e047ff | 3704 | error_rcu_unlock: |
48842b30 | 3705 | rcu_read_unlock(); |
3c14c33f | 3706 | return ret; |
48842b30 DG |
3707 | } |
3708 | ||
5b4a0ec0 | 3709 | /* |
edb67388 | 3710 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3711 | */ |
35a9059d | 3712 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3713 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3714 | { | |
3715 | int ret = 0; | |
bec39940 | 3716 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3717 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3718 | struct ust_app *app; |
3719 | struct ust_app_session *ua_sess; | |
3720 | struct ust_app_channel *ua_chan; | |
3721 | struct ust_app_event *ua_event; | |
48842b30 | 3722 | |
d9bf3ca4 | 3723 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3724 | uevent->attr.name, usess->id); |
48842b30 | 3725 | |
edb67388 DG |
3726 | /* |
3727 | * NOTE: At this point, this function is called only if the session and | |
3728 | * channel passed are already created for all apps. and enabled on the | |
3729 | * tracer also. | |
3730 | */ | |
3731 | ||
48842b30 | 3732 | rcu_read_lock(); |
421cb601 DG |
3733 | |
3734 | /* For all registered applications */ | |
852d0037 | 3735 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3736 | if (!app->compatible) { |
3737 | /* | |
3738 | * TODO: In time, we should notice the caller of this error by | |
3739 | * telling him that this is a version error. | |
3740 | */ | |
3741 | continue; | |
3742 | } | |
edb67388 | 3743 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3744 | if (!ua_sess) { |
3745 | /* The application has problem or is probably dead. */ | |
3746 | continue; | |
3747 | } | |
ba767faf | 3748 | |
d0b96690 DG |
3749 | pthread_mutex_lock(&ua_sess->lock); |
3750 | ||
edb67388 | 3751 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3752 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3753 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3754 | /* If the channel is not found, there is a code flow error */ |
3755 | assert(ua_chan_node); | |
3756 | ||
3757 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3758 | ||
18eace3b DG |
3759 | /* Get event node */ |
3760 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 3761 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3762 | if (ua_event == NULL) { |
7f79d3a1 | 3763 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3764 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3765 | goto next_app; |
35a9059d | 3766 | } |
35a9059d DG |
3767 | |
3768 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3769 | if (ret < 0) { | |
d0b96690 | 3770 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3771 | goto error; |
48842b30 | 3772 | } |
d0b96690 DG |
3773 | next_app: |
3774 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3775 | } |
3776 | ||
7f79d3a1 | 3777 | error: |
edb67388 | 3778 | rcu_read_unlock(); |
edb67388 DG |
3779 | return ret; |
3780 | } | |
3781 | ||
3782 | /* | |
3783 | * For a specific existing UST session and UST channel, creates the event for | |
3784 | * all registered apps. | |
3785 | */ | |
35a9059d | 3786 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3787 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3788 | { | |
3789 | int ret = 0; | |
bec39940 DG |
3790 | struct lttng_ht_iter iter, uiter; |
3791 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3792 | struct ust_app *app; |
3793 | struct ust_app_session *ua_sess; | |
3794 | struct ust_app_channel *ua_chan; | |
3795 | ||
d9bf3ca4 | 3796 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3797 | uevent->attr.name, usess->id); |
edb67388 | 3798 | |
edb67388 DG |
3799 | rcu_read_lock(); |
3800 | ||
3801 | /* For all registered applications */ | |
852d0037 | 3802 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3803 | if (!app->compatible) { |
3804 | /* | |
3805 | * TODO: In time, we should notice the caller of this error by | |
3806 | * telling him that this is a version error. | |
3807 | */ | |
3808 | continue; | |
3809 | } | |
edb67388 | 3810 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3811 | if (!ua_sess) { |
3812 | /* The application has problem or is probably dead. */ | |
3813 | continue; | |
3814 | } | |
48842b30 | 3815 | |
d0b96690 | 3816 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3817 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3818 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3819 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3820 | /* If the channel is not found, there is a code flow error */ |
3821 | assert(ua_chan_node); | |
3822 | ||
48842b30 DG |
3823 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3824 | ||
edb67388 | 3825 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3826 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3827 | if (ret < 0) { |
49c336c1 | 3828 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3829 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3830 | break; | |
3831 | } | |
3832 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3833 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3834 | continue; |
48842b30 | 3835 | } |
48842b30 | 3836 | } |
5b4a0ec0 | 3837 | |
48842b30 DG |
3838 | rcu_read_unlock(); |
3839 | ||
3840 | return ret; | |
3841 | } | |
3842 | ||
5b4a0ec0 DG |
3843 | /* |
3844 | * Start tracing for a specific UST session and app. | |
3845 | */ | |
b34cbebf | 3846 | static |
421cb601 | 3847 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3848 | { |
3849 | int ret = 0; | |
48842b30 | 3850 | struct ust_app_session *ua_sess; |
48842b30 | 3851 | |
852d0037 | 3852 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3853 | |
509cbaf8 MD |
3854 | rcu_read_lock(); |
3855 | ||
e0c7ec2b DG |
3856 | if (!app->compatible) { |
3857 | goto end; | |
3858 | } | |
3859 | ||
421cb601 DG |
3860 | ua_sess = lookup_session_by_app(usess, app); |
3861 | if (ua_sess == NULL) { | |
d42f20df DG |
3862 | /* The session is in teardown process. Ignore and continue. */ |
3863 | goto end; | |
421cb601 | 3864 | } |
48842b30 | 3865 | |
d0b96690 DG |
3866 | pthread_mutex_lock(&ua_sess->lock); |
3867 | ||
aea829b3 DG |
3868 | /* Upon restart, we skip the setup, already done */ |
3869 | if (ua_sess->started) { | |
8be98f9a | 3870 | goto skip_setup; |
aea829b3 | 3871 | } |
8be98f9a | 3872 | |
a4b92340 DG |
3873 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3874 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3875 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3876 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3877 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3878 | if (ret < 0) { |
3879 | if (ret != -EEXIST) { | |
3880 | ERR("Trace directory creation error"); | |
d0b96690 | 3881 | goto error_unlock; |
421cb601 | 3882 | } |
173af62f | 3883 | } |
7753dea8 | 3884 | } |
aea829b3 | 3885 | |
d65d2de8 DG |
3886 | /* |
3887 | * Create the metadata for the application. This returns gracefully if a | |
3888 | * metadata was already set for the session. | |
3889 | */ | |
ad7a9107 | 3890 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 3891 | if (ret < 0) { |
d0b96690 | 3892 | goto error_unlock; |
421cb601 | 3893 | } |
48842b30 | 3894 | |
840cb59c | 3895 | health_code_update(); |
86acf0da | 3896 | |
8be98f9a | 3897 | skip_setup: |
421cb601 | 3898 | /* This start the UST tracing */ |
852d0037 | 3899 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3900 | if (ret < 0) { |
ffe60014 DG |
3901 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3902 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3903 | app->pid, ret); | |
3904 | } else { | |
3905 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
3906 | /* |
3907 | * This is normal behavior, an application can die during the | |
3908 | * creation process. Don't report an error so the execution can | |
3909 | * continue normally. | |
3910 | */ | |
3911 | pthread_mutex_unlock(&ua_sess->lock); | |
3912 | goto end; | |
ffe60014 | 3913 | } |
d0b96690 | 3914 | goto error_unlock; |
421cb601 | 3915 | } |
5b4a0ec0 | 3916 | |
55c3953d DG |
3917 | /* Indicate that the session has been started once */ |
3918 | ua_sess->started = 1; | |
3919 | ||
d0b96690 DG |
3920 | pthread_mutex_unlock(&ua_sess->lock); |
3921 | ||
840cb59c | 3922 | health_code_update(); |
86acf0da | 3923 | |
421cb601 | 3924 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3925 | ret = ustctl_wait_quiescent(app->sock); |
3926 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3927 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3928 | app->pid, ret); | |
3929 | } | |
48842b30 | 3930 | |
e0c7ec2b DG |
3931 | end: |
3932 | rcu_read_unlock(); | |
840cb59c | 3933 | health_code_update(); |
421cb601 | 3934 | return 0; |
48842b30 | 3935 | |
d0b96690 DG |
3936 | error_unlock: |
3937 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3938 | rcu_read_unlock(); |
840cb59c | 3939 | health_code_update(); |
421cb601 DG |
3940 | return -1; |
3941 | } | |
48842b30 | 3942 | |
8be98f9a MD |
3943 | /* |
3944 | * Stop tracing for a specific UST session and app. | |
3945 | */ | |
b34cbebf | 3946 | static |
8be98f9a MD |
3947 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3948 | { | |
3949 | int ret = 0; | |
3950 | struct ust_app_session *ua_sess; | |
7972aab2 | 3951 | struct ust_registry_session *registry; |
8be98f9a | 3952 | |
852d0037 | 3953 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3954 | |
3955 | rcu_read_lock(); | |
3956 | ||
e0c7ec2b | 3957 | if (!app->compatible) { |
d88aee68 | 3958 | goto end_no_session; |
e0c7ec2b DG |
3959 | } |
3960 | ||
8be98f9a MD |
3961 | ua_sess = lookup_session_by_app(usess, app); |
3962 | if (ua_sess == NULL) { | |
d88aee68 | 3963 | goto end_no_session; |
8be98f9a MD |
3964 | } |
3965 | ||
d88aee68 DG |
3966 | pthread_mutex_lock(&ua_sess->lock); |
3967 | ||
9bc07046 DG |
3968 | /* |
3969 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3970 | * that was never started. It's possible since we can have a fail start |
3971 | * from either the application manager thread or the command thread. Simply | |
3972 | * indicate that this is a stop error. | |
9bc07046 | 3973 | */ |
f9dfc3d9 | 3974 | if (!ua_sess->started) { |
c45536e1 DG |
3975 | goto error_rcu_unlock; |
3976 | } | |
7db205b5 | 3977 | |
840cb59c | 3978 | health_code_update(); |
86acf0da | 3979 | |
9d6c7d3f | 3980 | /* This inhibits UST tracing */ |
852d0037 | 3981 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3982 | if (ret < 0) { |
ffe60014 DG |
3983 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3984 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3985 | app->pid, ret); | |
3986 | } else { | |
3987 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
3988 | /* |
3989 | * This is normal behavior, an application can die during the | |
3990 | * creation process. Don't report an error so the execution can | |
3991 | * continue normally. | |
3992 | */ | |
3993 | goto end_unlock; | |
ffe60014 | 3994 | } |
9d6c7d3f DG |
3995 | goto error_rcu_unlock; |
3996 | } | |
3997 | ||
840cb59c | 3998 | health_code_update(); |
86acf0da | 3999 | |
9d6c7d3f | 4000 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4001 | ret = ustctl_wait_quiescent(app->sock); |
4002 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4003 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4004 | app->pid, ret); | |
4005 | } | |
9d6c7d3f | 4006 | |
840cb59c | 4007 | health_code_update(); |
86acf0da | 4008 | |
b34cbebf MD |
4009 | registry = get_session_registry(ua_sess); |
4010 | assert(registry); | |
1b532a60 DG |
4011 | |
4012 | if (!registry->metadata_closed) { | |
4013 | /* Push metadata for application before freeing the application. */ | |
4014 | (void) push_metadata(registry, ua_sess->consumer); | |
4015 | } | |
b34cbebf | 4016 | |
3757b385 | 4017 | end_unlock: |
b34cbebf MD |
4018 | pthread_mutex_unlock(&ua_sess->lock); |
4019 | end_no_session: | |
4020 | rcu_read_unlock(); | |
4021 | health_code_update(); | |
4022 | return 0; | |
4023 | ||
4024 | error_rcu_unlock: | |
4025 | pthread_mutex_unlock(&ua_sess->lock); | |
4026 | rcu_read_unlock(); | |
4027 | health_code_update(); | |
4028 | return -1; | |
4029 | } | |
4030 | ||
4031 | /* | |
4032 | * Flush buffers for a specific UST session and app. | |
4033 | */ | |
4034 | static | |
4035 | int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
4036 | { | |
4037 | int ret = 0; | |
4038 | struct lttng_ht_iter iter; | |
4039 | struct ust_app_session *ua_sess; | |
4040 | struct ust_app_channel *ua_chan; | |
4041 | ||
4042 | DBG("Flushing buffers for ust app pid %d", app->pid); | |
4043 | ||
4044 | rcu_read_lock(); | |
4045 | ||
4046 | if (!app->compatible) { | |
4047 | goto end_no_session; | |
4048 | } | |
4049 | ||
4050 | ua_sess = lookup_session_by_app(usess, app); | |
4051 | if (ua_sess == NULL) { | |
4052 | goto end_no_session; | |
4053 | } | |
4054 | ||
4055 | pthread_mutex_lock(&ua_sess->lock); | |
4056 | ||
4057 | health_code_update(); | |
4058 | ||
9d6c7d3f | 4059 | /* Flushing buffers */ |
bec39940 DG |
4060 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4061 | node.node) { | |
840cb59c | 4062 | health_code_update(); |
ffe60014 | 4063 | assert(ua_chan->is_sent); |
852d0037 | 4064 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 4065 | if (ret < 0) { |
ffe60014 DG |
4066 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4067 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
4068 | app->pid, ua_chan->name, ret); | |
4069 | } else { | |
4070 | DBG3("UST app failed to flush %s. Application is dead.", | |
4071 | ua_chan->name); | |
3757b385 DG |
4072 | /* |
4073 | * This is normal behavior, an application can die during the | |
4074 | * creation process. Don't report an error so the execution can | |
4075 | * continue normally. | |
4076 | */ | |
ffe60014 | 4077 | } |
6d3686da DG |
4078 | /* Continuing flushing all buffers */ |
4079 | continue; | |
8be98f9a MD |
4080 | } |
4081 | } | |
8be98f9a | 4082 | |
840cb59c | 4083 | health_code_update(); |
86acf0da | 4084 | |
d88aee68 DG |
4085 | pthread_mutex_unlock(&ua_sess->lock); |
4086 | end_no_session: | |
7db205b5 | 4087 | rcu_read_unlock(); |
840cb59c | 4088 | health_code_update(); |
8be98f9a | 4089 | return 0; |
8be98f9a MD |
4090 | } |
4091 | ||
84cd17c6 MD |
4092 | /* |
4093 | * Destroy a specific UST session in apps. | |
4094 | */ | |
3353de95 | 4095 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4096 | { |
ffe60014 | 4097 | int ret; |
84cd17c6 | 4098 | struct ust_app_session *ua_sess; |
bec39940 | 4099 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4100 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4101 | |
852d0037 | 4102 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4103 | |
4104 | rcu_read_lock(); | |
4105 | ||
e0c7ec2b DG |
4106 | if (!app->compatible) { |
4107 | goto end; | |
4108 | } | |
4109 | ||
84cd17c6 | 4110 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4111 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4112 | if (node == NULL) { |
d42f20df DG |
4113 | /* Session is being or is deleted. */ |
4114 | goto end; | |
84cd17c6 MD |
4115 | } |
4116 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4117 | |
840cb59c | 4118 | health_code_update(); |
d0b96690 | 4119 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4120 | |
840cb59c | 4121 | health_code_update(); |
7db205b5 | 4122 | |
84cd17c6 | 4123 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4124 | ret = ustctl_wait_quiescent(app->sock); |
4125 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4126 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4127 | app->pid, ret); | |
4128 | } | |
e0c7ec2b DG |
4129 | end: |
4130 | rcu_read_unlock(); | |
840cb59c | 4131 | health_code_update(); |
84cd17c6 | 4132 | return 0; |
84cd17c6 MD |
4133 | } |
4134 | ||
5b4a0ec0 DG |
4135 | /* |
4136 | * Start tracing for the UST session. | |
4137 | */ | |
421cb601 DG |
4138 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4139 | { | |
4140 | int ret = 0; | |
bec39940 | 4141 | struct lttng_ht_iter iter; |
421cb601 | 4142 | struct ust_app *app; |
48842b30 | 4143 | |
421cb601 DG |
4144 | DBG("Starting all UST traces"); |
4145 | ||
4146 | rcu_read_lock(); | |
421cb601 | 4147 | |
852d0037 | 4148 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4149 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4150 | if (ret < 0) { |
5b4a0ec0 DG |
4151 | /* Continue to next apps even on error */ |
4152 | continue; | |
48842b30 | 4153 | } |
48842b30 | 4154 | } |
5b4a0ec0 | 4155 | |
48842b30 DG |
4156 | rcu_read_unlock(); |
4157 | ||
4158 | return 0; | |
4159 | } | |
487cf67c | 4160 | |
8be98f9a MD |
4161 | /* |
4162 | * Start tracing for the UST session. | |
4163 | */ | |
4164 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4165 | { | |
4166 | int ret = 0; | |
bec39940 | 4167 | struct lttng_ht_iter iter; |
8be98f9a MD |
4168 | struct ust_app *app; |
4169 | ||
4170 | DBG("Stopping all UST traces"); | |
4171 | ||
4172 | rcu_read_lock(); | |
4173 | ||
b34cbebf MD |
4174 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4175 | ret = ust_app_stop_trace(usess, app); | |
4176 | if (ret < 0) { | |
4177 | /* Continue to next apps even on error */ | |
4178 | continue; | |
4179 | } | |
4180 | } | |
4181 | ||
b0a5f0fb | 4182 | /* Flush buffers and push metadata (for UID buffers). */ |
b34cbebf MD |
4183 | switch (usess->buffer_type) { |
4184 | case LTTNG_BUFFER_PER_UID: | |
4185 | { | |
7972aab2 | 4186 | struct buffer_reg_uid *reg; |
b34cbebf MD |
4187 | |
4188 | /* Flush all per UID buffers associated to that session. */ | |
7972aab2 | 4189 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
b0a5f0fb | 4190 | struct ust_registry_session *ust_session_reg; |
7972aab2 DG |
4191 | struct buffer_reg_channel *reg_chan; |
4192 | struct consumer_socket *socket; | |
4193 | ||
4194 | /* Get consumer socket to use to push the metadata.*/ | |
4195 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4196 | usess->consumer); | |
4197 | if (!socket) { | |
4198 | /* Ignore request if no consumer is found for the session. */ | |
4199 | continue; | |
4200 | } | |
4201 | ||
4202 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4203 | reg_chan, node.node) { | |
4204 | /* | |
4205 | * The following call will print error values so the return | |
4206 | * code is of little importance because whatever happens, we | |
4207 | * have to try them all. | |
4208 | */ | |
4209 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4210 | } | |
b0a5f0fb MD |
4211 | |
4212 | ust_session_reg = reg->registry->reg.ust; | |
4213 | if (!ust_session_reg->metadata_closed) { | |
4214 | /* Push metadata. */ | |
4215 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4216 | } | |
7972aab2 | 4217 | } |
b0a5f0fb | 4218 | |
b34cbebf | 4219 | break; |
7972aab2 | 4220 | } |
b34cbebf MD |
4221 | case LTTNG_BUFFER_PER_PID: |
4222 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4223 | ret = ust_app_flush_trace(usess, app); | |
4224 | if (ret < 0) { | |
4225 | /* Continue to next apps even on error */ | |
4226 | continue; | |
4227 | } | |
8be98f9a | 4228 | } |
b34cbebf MD |
4229 | break; |
4230 | default: | |
4231 | assert(0); | |
4232 | break; | |
8be98f9a MD |
4233 | } |
4234 | ||
4235 | rcu_read_unlock(); | |
4236 | ||
4237 | return 0; | |
4238 | } | |
4239 | ||
84cd17c6 MD |
4240 | /* |
4241 | * Destroy app UST session. | |
4242 | */ | |
4243 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4244 | { | |
4245 | int ret = 0; | |
bec39940 | 4246 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4247 | struct ust_app *app; |
4248 | ||
4249 | DBG("Destroy all UST traces"); | |
4250 | ||
4251 | rcu_read_lock(); | |
4252 | ||
852d0037 | 4253 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4254 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4255 | if (ret < 0) { |
4256 | /* Continue to next apps even on error */ | |
4257 | continue; | |
4258 | } | |
4259 | } | |
4260 | ||
4261 | rcu_read_unlock(); | |
4262 | ||
4263 | return 0; | |
4264 | } | |
4265 | ||
5b4a0ec0 DG |
4266 | /* |
4267 | * Add channels/events from UST global domain to registered apps at sock. | |
4268 | */ | |
487cf67c DG |
4269 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4270 | { | |
55c54cce | 4271 | int ret = 0; |
31746f93 | 4272 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4273 | struct ust_app *app; |
3d8ca23b | 4274 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4275 | struct ust_app_channel *ua_chan; |
4276 | struct ust_app_event *ua_event; | |
727d5404 | 4277 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4278 | |
95e047ff | 4279 | assert(usess); |
ffe60014 | 4280 | assert(sock >= 0); |
1f3580c7 | 4281 | |
d9bf3ca4 | 4282 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4283 | usess->id); |
487cf67c | 4284 | |
284d8f55 DG |
4285 | rcu_read_lock(); |
4286 | ||
f20baf8e | 4287 | app = ust_app_find_by_sock(sock); |
487cf67c | 4288 | if (app == NULL) { |
d88aee68 DG |
4289 | /* |
4290 | * Application can be unregistered before so this is possible hence | |
4291 | * simply stopping the update. | |
4292 | */ | |
4293 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4294 | goto error; |
4295 | } | |
4296 | ||
e0c7ec2b DG |
4297 | if (!app->compatible) { |
4298 | goto error; | |
4299 | } | |
4300 | ||
3d8ca23b DG |
4301 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4302 | if (ret < 0) { | |
4303 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4304 | goto error; |
4305 | } | |
3d8ca23b | 4306 | assert(ua_sess); |
487cf67c | 4307 | |
d0b96690 DG |
4308 | pthread_mutex_lock(&ua_sess->lock); |
4309 | ||
284d8f55 | 4310 | /* |
d0b96690 | 4311 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4312 | * app session above made a shadow copy of the UST global domain from the |
4313 | * ltt ust session. | |
4314 | */ | |
bec39940 DG |
4315 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4316 | node.node) { | |
ad7a9107 DG |
4317 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
4318 | if (ret < 0) { | |
4319 | /* | |
4320 | * Stop everything. On error, the application failed, no more | |
4321 | * file descriptor are available or ENOMEM so stopping here is | |
4322 | * the only thing we can do for now. | |
4323 | */ | |
4324 | goto error_unlock; | |
487cf67c DG |
4325 | } |
4326 | ||
31746f93 DG |
4327 | /* |
4328 | * Add context using the list so they are enabled in the same order the | |
4329 | * user added them. | |
4330 | */ | |
4331 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4332 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4333 | if (ret < 0) { | |
d0b96690 | 4334 | goto error_unlock; |
727d5404 DG |
4335 | } |
4336 | } | |
4337 | ||
4338 | ||
284d8f55 | 4339 | /* For each events */ |
bec39940 DG |
4340 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4341 | node.node) { | |
284d8f55 DG |
4342 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4343 | if (ret < 0) { | |
d0b96690 | 4344 | goto error_unlock; |
487cf67c | 4345 | } |
36dc12cc | 4346 | } |
487cf67c DG |
4347 | } |
4348 | ||
d0b96690 DG |
4349 | pthread_mutex_unlock(&ua_sess->lock); |
4350 | ||
14fb1ebe | 4351 | if (usess->active) { |
421cb601 | 4352 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4353 | if (ret < 0) { |
36dc12cc DG |
4354 | goto error; |
4355 | } | |
4356 | ||
852d0037 | 4357 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4358 | } |
4359 | ||
ffe60014 DG |
4360 | /* Everything went well at this point. */ |
4361 | rcu_read_unlock(); | |
4362 | return; | |
4363 | ||
d0b96690 DG |
4364 | error_unlock: |
4365 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4366 | error: |
ffe60014 | 4367 | if (ua_sess) { |
d0b96690 | 4368 | destroy_app_session(app, ua_sess); |
ffe60014 | 4369 | } |
487cf67c DG |
4370 | rcu_read_unlock(); |
4371 | return; | |
4372 | } | |
55cc08a6 DG |
4373 | |
4374 | /* | |
4375 | * Add context to a specific channel for global UST domain. | |
4376 | */ | |
4377 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4378 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4379 | { | |
4380 | int ret = 0; | |
bec39940 DG |
4381 | struct lttng_ht_node_str *ua_chan_node; |
4382 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4383 | struct ust_app_channel *ua_chan = NULL; |
4384 | struct ust_app_session *ua_sess; | |
4385 | struct ust_app *app; | |
4386 | ||
4387 | rcu_read_lock(); | |
4388 | ||
852d0037 | 4389 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4390 | if (!app->compatible) { |
4391 | /* | |
4392 | * TODO: In time, we should notice the caller of this error by | |
4393 | * telling him that this is a version error. | |
4394 | */ | |
4395 | continue; | |
4396 | } | |
55cc08a6 DG |
4397 | ua_sess = lookup_session_by_app(usess, app); |
4398 | if (ua_sess == NULL) { | |
4399 | continue; | |
4400 | } | |
4401 | ||
d0b96690 | 4402 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4403 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4404 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4405 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4406 | if (ua_chan_node == NULL) { |
d0b96690 | 4407 | goto next_app; |
55cc08a6 DG |
4408 | } |
4409 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4410 | node); | |
55cc08a6 DG |
4411 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4412 | if (ret < 0) { | |
d0b96690 | 4413 | goto next_app; |
55cc08a6 | 4414 | } |
d0b96690 DG |
4415 | next_app: |
4416 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4417 | } |
4418 | ||
55cc08a6 DG |
4419 | rcu_read_unlock(); |
4420 | return ret; | |
4421 | } | |
4422 | ||
76d45b40 DG |
4423 | /* |
4424 | * Enable event for a channel from a UST session for a specific PID. | |
4425 | */ | |
4426 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4427 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4428 | { | |
4429 | int ret = 0; | |
bec39940 | 4430 | struct lttng_ht_iter iter; |
18eace3b | 4431 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4432 | struct ust_app *app; |
4433 | struct ust_app_session *ua_sess; | |
4434 | struct ust_app_channel *ua_chan; | |
4435 | struct ust_app_event *ua_event; | |
4436 | ||
4437 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4438 | ||
4439 | rcu_read_lock(); | |
4440 | ||
4441 | app = ust_app_find_by_pid(pid); | |
4442 | if (app == NULL) { | |
4443 | ERR("UST app enable event per PID %d not found", pid); | |
4444 | ret = -1; | |
d0b96690 | 4445 | goto end; |
76d45b40 DG |
4446 | } |
4447 | ||
e0c7ec2b DG |
4448 | if (!app->compatible) { |
4449 | ret = 0; | |
d0b96690 | 4450 | goto end; |
e0c7ec2b DG |
4451 | } |
4452 | ||
76d45b40 | 4453 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4454 | if (!ua_sess) { |
4455 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4456 | ret = 0; |
4457 | goto end; | |
c4a1715b | 4458 | } |
76d45b40 | 4459 | |
d0b96690 | 4460 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4461 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4462 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4463 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4464 | /* If the channel is not found, there is a code flow error */ |
4465 | assert(ua_chan_node); | |
4466 | ||
4467 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4468 | ||
18eace3b | 4469 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 4470 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4471 | if (ua_event == NULL) { |
76d45b40 DG |
4472 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4473 | if (ret < 0) { | |
d0b96690 | 4474 | goto end_unlock; |
76d45b40 DG |
4475 | } |
4476 | } else { | |
76d45b40 DG |
4477 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4478 | if (ret < 0) { | |
d0b96690 | 4479 | goto end_unlock; |
76d45b40 DG |
4480 | } |
4481 | } | |
4482 | ||
d0b96690 DG |
4483 | end_unlock: |
4484 | pthread_mutex_unlock(&ua_sess->lock); | |
4485 | end: | |
76d45b40 DG |
4486 | rcu_read_unlock(); |
4487 | return ret; | |
4488 | } | |
7f79d3a1 | 4489 | |
4466912f DG |
4490 | /* |
4491 | * Calibrate registered applications. | |
4492 | */ | |
4493 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4494 | { | |
4495 | int ret = 0; | |
4496 | struct lttng_ht_iter iter; | |
4497 | struct ust_app *app; | |
4498 | ||
4499 | rcu_read_lock(); | |
4500 | ||
852d0037 | 4501 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4502 | if (!app->compatible) { |
4503 | /* | |
4504 | * TODO: In time, we should notice the caller of this error by | |
4505 | * telling him that this is a version error. | |
4506 | */ | |
4507 | continue; | |
4508 | } | |
4509 | ||
840cb59c | 4510 | health_code_update(); |
86acf0da | 4511 | |
852d0037 | 4512 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4513 | if (ret < 0) { |
4514 | switch (ret) { | |
4515 | case -ENOSYS: | |
4516 | /* Means that it's not implemented on the tracer side. */ | |
4517 | ret = 0; | |
4518 | break; | |
4519 | default: | |
4466912f | 4520 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4521 | app->pid, ret); |
4466912f DG |
4522 | break; |
4523 | } | |
4524 | } | |
4525 | } | |
4526 | ||
4527 | DBG("UST app global domain calibration finished"); | |
4528 | ||
4529 | rcu_read_unlock(); | |
4530 | ||
840cb59c | 4531 | health_code_update(); |
86acf0da | 4532 | |
4466912f DG |
4533 | return ret; |
4534 | } | |
d0b96690 DG |
4535 | |
4536 | /* | |
4537 | * Receive registration and populate the given msg structure. | |
4538 | * | |
4539 | * On success return 0 else a negative value returned by the ustctl call. | |
4540 | */ | |
4541 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4542 | { | |
4543 | int ret; | |
4544 | uint32_t pid, ppid, uid, gid; | |
4545 | ||
4546 | assert(msg); | |
4547 | ||
4548 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4549 | &pid, &ppid, &uid, &gid, | |
4550 | &msg->bits_per_long, | |
4551 | &msg->uint8_t_alignment, | |
4552 | &msg->uint16_t_alignment, | |
4553 | &msg->uint32_t_alignment, | |
4554 | &msg->uint64_t_alignment, | |
4555 | &msg->long_alignment, | |
4556 | &msg->byte_order, | |
4557 | msg->name); | |
4558 | if (ret < 0) { | |
4559 | switch (-ret) { | |
4560 | case EPIPE: | |
4561 | case ECONNRESET: | |
4562 | case LTTNG_UST_ERR_EXITING: | |
4563 | DBG3("UST app recv reg message failed. Application died"); | |
4564 | break; | |
4565 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4566 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4567 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4568 | LTTNG_UST_ABI_MINOR_VERSION); | |
4569 | break; | |
4570 | default: | |
4571 | ERR("UST app recv reg message failed with ret %d", ret); | |
4572 | break; | |
4573 | } | |
4574 | goto error; | |
4575 | } | |
4576 | msg->pid = (pid_t) pid; | |
4577 | msg->ppid = (pid_t) ppid; | |
4578 | msg->uid = (uid_t) uid; | |
4579 | msg->gid = (gid_t) gid; | |
4580 | ||
4581 | error: | |
4582 | return ret; | |
4583 | } | |
4584 | ||
d88aee68 DG |
4585 | /* |
4586 | * Return a ust app channel object using the application object and the channel | |
4587 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4588 | * lock MUST be acquired before calling this function. | |
4589 | */ | |
d0b96690 DG |
4590 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4591 | int objd) | |
4592 | { | |
4593 | struct lttng_ht_node_ulong *node; | |
4594 | struct lttng_ht_iter iter; | |
4595 | struct ust_app_channel *ua_chan = NULL; | |
4596 | ||
4597 | assert(app); | |
4598 | ||
4599 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4600 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4601 | if (node == NULL) { | |
4602 | DBG2("UST app channel find by objd %d not found", objd); | |
4603 | goto error; | |
4604 | } | |
4605 | ||
4606 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4607 | ||
4608 | error: | |
4609 | return ua_chan; | |
4610 | } | |
4611 | ||
d88aee68 DG |
4612 | /* |
4613 | * Reply to a register channel notification from an application on the notify | |
4614 | * socket. The channel metadata is also created. | |
4615 | * | |
4616 | * The session UST registry lock is acquired in this function. | |
4617 | * | |
4618 | * On success 0 is returned else a negative value. | |
4619 | */ | |
d0b96690 DG |
4620 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4621 | size_t nr_fields, struct ustctl_field *fields) | |
4622 | { | |
4623 | int ret, ret_code = 0; | |
4624 | uint32_t chan_id, reg_count; | |
7972aab2 | 4625 | uint64_t chan_reg_key; |
d0b96690 DG |
4626 | enum ustctl_channel_header type; |
4627 | struct ust_app *app; | |
4628 | struct ust_app_channel *ua_chan; | |
4629 | struct ust_app_session *ua_sess; | |
7972aab2 | 4630 | struct ust_registry_session *registry; |
45893984 | 4631 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4632 | |
4633 | rcu_read_lock(); | |
4634 | ||
4635 | /* Lookup application. If not found, there is a code flow error. */ | |
4636 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4637 | if (!app) { |
4638 | DBG("Application socket %d is being teardown. Abort event notify", | |
4639 | sock); | |
4640 | ret = 0; | |
d5d629b5 | 4641 | free(fields); |
d88aee68 DG |
4642 | goto error_rcu_unlock; |
4643 | } | |
d0b96690 | 4644 | |
4950b860 | 4645 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4646 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4647 | if (!ua_chan) { |
4648 | DBG("Application channel is being teardown. Abort event notify"); | |
4649 | ret = 0; | |
d5d629b5 | 4650 | free(fields); |
4950b860 MD |
4651 | goto error_rcu_unlock; |
4652 | } | |
4653 | ||
d0b96690 DG |
4654 | assert(ua_chan->session); |
4655 | ua_sess = ua_chan->session; | |
d0b96690 | 4656 | |
7972aab2 DG |
4657 | /* Get right session registry depending on the session buffer type. */ |
4658 | registry = get_session_registry(ua_sess); | |
4659 | assert(registry); | |
45893984 | 4660 | |
7972aab2 DG |
4661 | /* Depending on the buffer type, a different channel key is used. */ |
4662 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4663 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4664 | } else { |
7972aab2 | 4665 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4666 | } |
4667 | ||
7972aab2 DG |
4668 | pthread_mutex_lock(®istry->lock); |
4669 | ||
4670 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4671 | assert(chan_reg); | |
4672 | ||
4673 | if (!chan_reg->register_done) { | |
4674 | reg_count = ust_registry_get_event_count(chan_reg); | |
4675 | if (reg_count < 31) { | |
4676 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4677 | } else { | |
4678 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4679 | } | |
4680 | ||
4681 | chan_reg->nr_ctx_fields = nr_fields; | |
4682 | chan_reg->ctx_fields = fields; | |
4683 | chan_reg->header_type = type; | |
d0b96690 | 4684 | } else { |
7972aab2 DG |
4685 | /* Get current already assigned values. */ |
4686 | type = chan_reg->header_type; | |
d5d629b5 DG |
4687 | free(fields); |
4688 | /* Set to NULL so the error path does not do a double free. */ | |
4689 | fields = NULL; | |
d0b96690 | 4690 | } |
7972aab2 DG |
4691 | /* Channel id is set during the object creation. */ |
4692 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4693 | |
4694 | /* Append to metadata */ | |
7972aab2 DG |
4695 | if (!chan_reg->metadata_dumped) { |
4696 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4697 | if (ret_code) { |
4698 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4699 | goto reply; | |
4700 | } | |
4701 | } | |
4702 | ||
4703 | reply: | |
7972aab2 DG |
4704 | DBG3("UST app replying to register channel key %" PRIu64 |
4705 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4706 | ret_code); | |
d0b96690 DG |
4707 | |
4708 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4709 | if (ret < 0) { | |
4710 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4711 | ERR("UST app reply channel failed with ret %d", ret); | |
4712 | } else { | |
4713 | DBG3("UST app reply channel failed. Application died"); | |
4714 | } | |
4715 | goto error; | |
4716 | } | |
4717 | ||
7972aab2 DG |
4718 | /* This channel registry registration is completed. */ |
4719 | chan_reg->register_done = 1; | |
4720 | ||
d0b96690 | 4721 | error: |
7972aab2 | 4722 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4723 | error_rcu_unlock: |
d0b96690 | 4724 | rcu_read_unlock(); |
d5d629b5 DG |
4725 | if (ret) { |
4726 | free(fields); | |
4727 | } | |
d0b96690 DG |
4728 | return ret; |
4729 | } | |
4730 | ||
d88aee68 DG |
4731 | /* |
4732 | * Add event to the UST channel registry. When the event is added to the | |
4733 | * registry, the metadata is also created. Once done, this replies to the | |
4734 | * application with the appropriate error code. | |
4735 | * | |
4736 | * The session UST registry lock is acquired in the function. | |
4737 | * | |
4738 | * On success 0 is returned else a negative value. | |
4739 | */ | |
d0b96690 DG |
4740 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4741 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4742 | char *model_emf_uri) | |
4743 | { | |
4744 | int ret, ret_code; | |
4745 | uint32_t event_id = 0; | |
7972aab2 | 4746 | uint64_t chan_reg_key; |
d0b96690 DG |
4747 | struct ust_app *app; |
4748 | struct ust_app_channel *ua_chan; | |
4749 | struct ust_app_session *ua_sess; | |
7972aab2 | 4750 | struct ust_registry_session *registry; |
d0b96690 DG |
4751 | |
4752 | rcu_read_lock(); | |
4753 | ||
4754 | /* Lookup application. If not found, there is a code flow error. */ | |
4755 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4756 | if (!app) { |
4757 | DBG("Application socket %d is being teardown. Abort event notify", | |
4758 | sock); | |
4759 | ret = 0; | |
d5d629b5 DG |
4760 | free(sig); |
4761 | free(fields); | |
4762 | free(model_emf_uri); | |
d88aee68 DG |
4763 | goto error_rcu_unlock; |
4764 | } | |
d0b96690 | 4765 | |
4950b860 | 4766 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4767 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4768 | if (!ua_chan) { |
4769 | DBG("Application channel is being teardown. Abort event notify"); | |
4770 | ret = 0; | |
d5d629b5 DG |
4771 | free(sig); |
4772 | free(fields); | |
4773 | free(model_emf_uri); | |
4950b860 MD |
4774 | goto error_rcu_unlock; |
4775 | } | |
4776 | ||
d0b96690 DG |
4777 | assert(ua_chan->session); |
4778 | ua_sess = ua_chan->session; | |
4779 | ||
7972aab2 DG |
4780 | registry = get_session_registry(ua_sess); |
4781 | assert(registry); | |
4782 | ||
4783 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4784 | chan_reg_key = ua_chan->tracing_channel_id; | |
4785 | } else { | |
4786 | chan_reg_key = ua_chan->key; | |
4787 | } | |
4788 | ||
4789 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4790 | |
d5d629b5 DG |
4791 | /* |
4792 | * From this point on, this call acquires the ownership of the sig, fields | |
4793 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4794 | * three variables MUST NOT be read/write after this. | |
4795 | */ | |
7972aab2 | 4796 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4797 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
8494bda5 MD |
4798 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4799 | app); | |
d0b96690 DG |
4800 | |
4801 | /* | |
4802 | * The return value is returned to ustctl so in case of an error, the | |
4803 | * application can be notified. In case of an error, it's important not to | |
4804 | * return a negative error or else the application will get closed. | |
4805 | */ | |
4806 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4807 | if (ret < 0) { | |
4808 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4809 | ERR("UST app reply event failed with ret %d", ret); | |
4810 | } else { | |
4811 | DBG3("UST app reply event failed. Application died"); | |
4812 | } | |
4813 | /* | |
4814 | * No need to wipe the create event since the application socket will | |
4815 | * get close on error hence cleaning up everything by itself. | |
4816 | */ | |
4817 | goto error; | |
4818 | } | |
4819 | ||
7972aab2 DG |
4820 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4821 | name, event_id); | |
d88aee68 | 4822 | |
d0b96690 | 4823 | error: |
7972aab2 | 4824 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4825 | error_rcu_unlock: |
d0b96690 DG |
4826 | rcu_read_unlock(); |
4827 | return ret; | |
4828 | } | |
4829 | ||
d88aee68 DG |
4830 | /* |
4831 | * Handle application notification through the given notify socket. | |
4832 | * | |
4833 | * Return 0 on success or else a negative value. | |
4834 | */ | |
d0b96690 DG |
4835 | int ust_app_recv_notify(int sock) |
4836 | { | |
4837 | int ret; | |
4838 | enum ustctl_notify_cmd cmd; | |
4839 | ||
4840 | DBG3("UST app receiving notify from sock %d", sock); | |
4841 | ||
4842 | ret = ustctl_recv_notify(sock, &cmd); | |
4843 | if (ret < 0) { | |
4844 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4845 | ERR("UST app recv notify failed with ret %d", ret); | |
4846 | } else { | |
4847 | DBG3("UST app recv notify failed. Application died"); | |
4848 | } | |
4849 | goto error; | |
4850 | } | |
4851 | ||
4852 | switch (cmd) { | |
4853 | case USTCTL_NOTIFY_CMD_EVENT: | |
4854 | { | |
4855 | int sobjd, cobjd, loglevel; | |
4856 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4857 | size_t nr_fields; | |
4858 | struct ustctl_field *fields; | |
4859 | ||
4860 | DBG2("UST app ustctl register event received"); | |
4861 | ||
4862 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4863 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4864 | if (ret < 0) { | |
4865 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4866 | ERR("UST app recv event failed with ret %d", ret); | |
4867 | } else { | |
4868 | DBG3("UST app recv event failed. Application died"); | |
4869 | } | |
4870 | goto error; | |
4871 | } | |
4872 | ||
d5d629b5 DG |
4873 | /* |
4874 | * Add event to the UST registry coming from the notify socket. This | |
4875 | * call will free if needed the sig, fields and model_emf_uri. This | |
4876 | * code path loses the ownsership of these variables and transfer them | |
4877 | * to the this function. | |
4878 | */ | |
d0b96690 DG |
4879 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4880 | fields, loglevel, model_emf_uri); | |
4881 | if (ret < 0) { | |
4882 | goto error; | |
4883 | } | |
4884 | ||
4885 | break; | |
4886 | } | |
4887 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4888 | { | |
4889 | int sobjd, cobjd; | |
4890 | size_t nr_fields; | |
4891 | struct ustctl_field *fields; | |
4892 | ||
4893 | DBG2("UST app ustctl register channel received"); | |
4894 | ||
4895 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4896 | &fields); | |
4897 | if (ret < 0) { | |
4898 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4899 | ERR("UST app recv channel failed with ret %d", ret); | |
4900 | } else { | |
4901 | DBG3("UST app recv channel failed. Application died"); | |
4902 | } | |
4903 | goto error; | |
4904 | } | |
4905 | ||
d5d629b5 DG |
4906 | /* |
4907 | * The fields ownership are transfered to this function call meaning | |
4908 | * that if needed it will be freed. After this, it's invalid to access | |
4909 | * fields or clean it up. | |
4910 | */ | |
d0b96690 DG |
4911 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4912 | fields); | |
4913 | if (ret < 0) { | |
4914 | goto error; | |
4915 | } | |
4916 | ||
4917 | break; | |
4918 | } | |
4919 | default: | |
4920 | /* Should NEVER happen. */ | |
4921 | assert(0); | |
4922 | } | |
4923 | ||
4924 | error: | |
4925 | return ret; | |
4926 | } | |
d88aee68 DG |
4927 | |
4928 | /* | |
4929 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4930 | * corresponding application. On failure, the call_rcu to close the socket is | |
4931 | * executed. If an application is found, it tries to delete it from the notify | |
4932 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4933 | * | |
4934 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4935 | * call RCU is not done but the rest of the cleanup is. | |
4936 | */ | |
4937 | void ust_app_notify_sock_unregister(int sock) | |
4938 | { | |
4939 | int err_enomem = 0; | |
4940 | struct lttng_ht_iter iter; | |
4941 | struct ust_app *app; | |
4942 | struct ust_app_notify_sock_obj *obj; | |
4943 | ||
4944 | assert(sock >= 0); | |
4945 | ||
4946 | rcu_read_lock(); | |
4947 | ||
4948 | obj = zmalloc(sizeof(*obj)); | |
4949 | if (!obj) { | |
4950 | /* | |
4951 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4952 | * procedure but the call_rcu will not be called. In this case, we | |
4953 | * accept the fd leak rather than possibly creating an unsynchronized | |
4954 | * state between threads. | |
4955 | * | |
4956 | * TODO: The notify object should be created once the notify socket is | |
4957 | * registered and stored independantely from the ust app object. The | |
4958 | * tricky part is to synchronize the teardown of the application and | |
4959 | * this notify object. Let's keep that in mind so we can avoid this | |
4960 | * kind of shenanigans with ENOMEM in the teardown path. | |
4961 | */ | |
4962 | err_enomem = 1; | |
4963 | } else { | |
4964 | obj->fd = sock; | |
4965 | } | |
4966 | ||
4967 | DBG("UST app notify socket unregister %d", sock); | |
4968 | ||
4969 | /* | |
4970 | * Lookup application by notify socket. If this fails, this means that the | |
4971 | * hash table delete has already been done by the application | |
4972 | * unregistration process so we can safely close the notify socket in a | |
4973 | * call RCU. | |
4974 | */ | |
4975 | app = find_app_by_notify_sock(sock); | |
4976 | if (!app) { | |
4977 | goto close_socket; | |
4978 | } | |
4979 | ||
4980 | iter.iter.node = &app->notify_sock_n.node; | |
4981 | ||
4982 | /* | |
4983 | * Whatever happens here either we fail or succeed, in both cases we have | |
4984 | * to close the socket after a grace period to continue to the call RCU | |
4985 | * here. If the deletion is successful, the application is not visible | |
4986 | * anymore by other threads and is it fails it means that it was already | |
4987 | * deleted from the hash table so either way we just have to close the | |
4988 | * socket. | |
4989 | */ | |
4990 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4991 | ||
4992 | close_socket: | |
4993 | rcu_read_unlock(); | |
4994 | ||
4995 | /* | |
4996 | * Close socket after a grace period to avoid for the socket to be reused | |
4997 | * before the application object is freed creating potential race between | |
4998 | * threads trying to add unique in the global hash table. | |
4999 | */ | |
5000 | if (!err_enomem) { | |
5001 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5002 | } | |
5003 | } | |
f45e313d DG |
5004 | |
5005 | /* | |
5006 | * Destroy a ust app data structure and free its memory. | |
5007 | */ | |
5008 | void ust_app_destroy(struct ust_app *app) | |
5009 | { | |
5010 | if (!app) { | |
5011 | return; | |
5012 | } | |
5013 | ||
5014 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5015 | } | |
6dc3064a DG |
5016 | |
5017 | /* | |
5018 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5019 | * output. | |
5020 | * | |
5021 | * Return 0 on success or else a negative value. | |
5022 | */ | |
5023 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
68808f4e | 5024 | struct snapshot_output *output, int wait, uint64_t max_stream_size) |
6dc3064a DG |
5025 | { |
5026 | int ret = 0; | |
7badf927 | 5027 | unsigned int snapshot_done = 0; |
6dc3064a DG |
5028 | struct lttng_ht_iter iter; |
5029 | struct ust_app *app; | |
af706bb7 | 5030 | char pathname[PATH_MAX]; |
6dc3064a DG |
5031 | |
5032 | assert(usess); | |
5033 | assert(output); | |
5034 | ||
5035 | rcu_read_lock(); | |
5036 | ||
8c924c7b MD |
5037 | switch (usess->buffer_type) { |
5038 | case LTTNG_BUFFER_PER_UID: | |
5039 | { | |
5040 | struct buffer_reg_uid *reg; | |
6dc3064a | 5041 | |
8c924c7b MD |
5042 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5043 | struct buffer_reg_channel *reg_chan; | |
5044 | struct consumer_socket *socket; | |
6dc3064a | 5045 | |
8c924c7b MD |
5046 | /* Get consumer socket to use to push the metadata.*/ |
5047 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5048 | usess->consumer); | |
5049 | if (!socket) { | |
5050 | ret = -EINVAL; | |
5051 | goto error; | |
5052 | } | |
6dc3064a | 5053 | |
8c924c7b MD |
5054 | memset(pathname, 0, sizeof(pathname)); |
5055 | ret = snprintf(pathname, sizeof(pathname), | |
5056 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5057 | reg->uid, reg->bits_per_long); | |
5058 | if (ret < 0) { | |
5059 | PERROR("snprintf snapshot path"); | |
5060 | goto error; | |
5061 | } | |
5062 | ||
5063 | /* Add the UST default trace dir to path. */ | |
5064 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5065 | reg_chan, node.node) { | |
68808f4e DG |
5066 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, |
5067 | output, 0, usess->uid, usess->gid, pathname, wait, | |
8c924c7b MD |
5068 | max_stream_size); |
5069 | if (ret < 0) { | |
5070 | goto error; | |
5071 | } | |
5072 | } | |
68808f4e DG |
5073 | ret = consumer_snapshot_channel(socket, |
5074 | reg->registry->reg.ust->metadata_key, output, 1, | |
5075 | usess->uid, usess->gid, pathname, wait, max_stream_size); | |
8c924c7b MD |
5076 | if (ret < 0) { |
5077 | goto error; | |
5078 | } | |
7badf927 | 5079 | snapshot_done = 1; |
af706bb7 | 5080 | } |
8c924c7b MD |
5081 | break; |
5082 | } | |
5083 | case LTTNG_BUFFER_PER_PID: | |
5084 | { | |
5085 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5086 | struct consumer_socket *socket; | |
5087 | struct lttng_ht_iter chan_iter; | |
5088 | struct ust_app_channel *ua_chan; | |
5089 | struct ust_app_session *ua_sess; | |
5090 | struct ust_registry_session *registry; | |
5091 | ||
5092 | ua_sess = lookup_session_by_app(usess, app); | |
5093 | if (!ua_sess) { | |
5094 | /* Session not associated with this app. */ | |
5095 | continue; | |
5096 | } | |
af706bb7 | 5097 | |
8c924c7b MD |
5098 | /* Get the right consumer socket for the application. */ |
5099 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5100 | output->consumer); | |
5101 | if (!socket) { | |
5c786ded | 5102 | ret = -EINVAL; |
5c786ded JD |
5103 | goto error; |
5104 | } | |
5105 | ||
8c924c7b MD |
5106 | /* Add the UST default trace dir to path. */ |
5107 | memset(pathname, 0, sizeof(pathname)); | |
5108 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5109 | ua_sess->path); | |
6dc3064a | 5110 | if (ret < 0) { |
8c924c7b | 5111 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5112 | goto error; |
5113 | } | |
6dc3064a | 5114 | |
8c924c7b MD |
5115 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5116 | ua_chan, node.node) { | |
68808f4e DG |
5117 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, |
5118 | 0, ua_sess->euid, ua_sess->egid, pathname, wait, | |
8c924c7b MD |
5119 | max_stream_size); |
5120 | if (ret < 0) { | |
5121 | goto error; | |
5122 | } | |
5123 | } | |
5124 | ||
5125 | registry = get_session_registry(ua_sess); | |
5126 | assert(registry); | |
5127 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
5128 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, | |
5129 | max_stream_size); | |
5130 | if (ret < 0) { | |
5131 | goto error; | |
5132 | } | |
7badf927 | 5133 | snapshot_done = 1; |
8c924c7b MD |
5134 | } |
5135 | break; | |
5136 | } | |
5137 | default: | |
5138 | assert(0); | |
5139 | break; | |
6dc3064a DG |
5140 | } |
5141 | ||
7badf927 DG |
5142 | if (!snapshot_done) { |
5143 | /* | |
5144 | * If no snapshot was made and we are not in the error path, this means | |
5145 | * that there are no buffers thus no (prior) application to snapshot | |
5146 | * data from so we have simply NO data. | |
5147 | */ | |
5148 | ret = -ENODATA; | |
5149 | } | |
5150 | ||
6dc3064a DG |
5151 | error: |
5152 | rcu_read_unlock(); | |
5153 | return ret; | |
5154 | } | |
5c786ded JD |
5155 | |
5156 | /* | |
5157 | * Return the number of streams for a UST session. | |
5158 | */ | |
5159 | unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess) | |
5160 | { | |
5161 | unsigned int ret = 0; | |
5162 | struct ust_app *app; | |
5163 | struct lttng_ht_iter iter; | |
5164 | ||
5165 | assert(usess); | |
5166 | ||
5167 | switch (usess->buffer_type) { | |
5168 | case LTTNG_BUFFER_PER_UID: | |
5169 | { | |
5170 | struct buffer_reg_uid *reg; | |
5171 | ||
5172 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5173 | struct buffer_reg_channel *reg_chan; | |
5174 | ||
5175 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5176 | reg_chan, node.node) { | |
5177 | ret += reg_chan->stream_count; | |
5178 | } | |
5179 | } | |
5180 | break; | |
5181 | } | |
5182 | case LTTNG_BUFFER_PER_PID: | |
5183 | { | |
5184 | rcu_read_lock(); | |
5185 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5186 | struct ust_app_channel *ua_chan; | |
5187 | struct ust_app_session *ua_sess; | |
5188 | struct lttng_ht_iter chan_iter; | |
5189 | ||
5190 | ua_sess = lookup_session_by_app(usess, app); | |
5191 | if (!ua_sess) { | |
5192 | /* Session not associated with this app. */ | |
5193 | continue; | |
5194 | } | |
5195 | ||
5196 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5197 | ua_chan, node.node) { | |
5198 | ret += ua_chan->streams.count; | |
5199 | } | |
5200 | } | |
5201 | rcu_read_unlock(); | |
5202 | break; | |
5203 | } | |
5204 | default: | |
5205 | assert(0); | |
5206 | break; | |
5207 | } | |
5208 | ||
5209 | return ret; | |
5210 | } |