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 | |
774a7dbd MD |
43 | static |
44 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
45 | ||
d9bf3ca4 MD |
46 | /* Next available channel key. Access under next_channel_key_lock. */ |
47 | static uint64_t _next_channel_key; | |
48 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
49 | ||
50 | /* Next available session ID. Access under next_session_id_lock. */ | |
51 | static uint64_t _next_session_id; | |
52 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
53 | |
54 | /* | |
d9bf3ca4 | 55 | * Return the incremented value of next_channel_key. |
ffe60014 | 56 | */ |
d9bf3ca4 | 57 | static uint64_t get_next_channel_key(void) |
ffe60014 | 58 | { |
d9bf3ca4 MD |
59 | uint64_t ret; |
60 | ||
61 | pthread_mutex_lock(&next_channel_key_lock); | |
62 | ret = ++_next_channel_key; | |
63 | pthread_mutex_unlock(&next_channel_key_lock); | |
64 | return ret; | |
ffe60014 DG |
65 | } |
66 | ||
67 | /* | |
7972aab2 | 68 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 69 | */ |
d9bf3ca4 | 70 | static uint64_t get_next_session_id(void) |
ffe60014 | 71 | { |
d9bf3ca4 MD |
72 | uint64_t ret; |
73 | ||
74 | pthread_mutex_lock(&next_session_id_lock); | |
75 | ret = ++_next_session_id; | |
76 | pthread_mutex_unlock(&next_session_id_lock); | |
77 | return ret; | |
ffe60014 DG |
78 | } |
79 | ||
d65d2de8 DG |
80 | static void copy_channel_attr_to_ustctl( |
81 | struct ustctl_consumer_channel_attr *attr, | |
82 | struct lttng_ust_channel_attr *uattr) | |
83 | { | |
84 | /* Copy event attributes since the layout is different. */ | |
85 | attr->subbuf_size = uattr->subbuf_size; | |
86 | attr->num_subbuf = uattr->num_subbuf; | |
87 | attr->overwrite = uattr->overwrite; | |
88 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
89 | attr->read_timer_interval = uattr->read_timer_interval; | |
90 | attr->output = uattr->output; | |
91 | } | |
92 | ||
025faf73 DG |
93 | /* |
94 | * Match function for the hash table lookup. | |
95 | * | |
96 | * It matches an ust app event based on three attributes which are the event | |
97 | * name, the filter bytecode and the loglevel. | |
98 | */ | |
18eace3b DG |
99 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
100 | { | |
101 | struct ust_app_event *event; | |
102 | const struct ust_app_ht_key *key; | |
103 | ||
104 | assert(node); | |
105 | assert(_key); | |
106 | ||
107 | event = caa_container_of(node, struct ust_app_event, node.node); | |
108 | key = _key; | |
109 | ||
1af53eb5 | 110 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
111 | |
112 | /* Event name */ | |
113 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
114 | goto no_match; | |
115 | } | |
116 | ||
117 | /* Event loglevel. */ | |
118 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
119 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
120 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
121 | /* | |
122 | * Match is accepted. This is because on event creation, the | |
123 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
124 | * -1 are accepted for this loglevel type since 0 is the one set by | |
125 | * the API when receiving an enable event. | |
126 | */ | |
127 | } else { | |
128 | goto no_match; | |
129 | } | |
18eace3b DG |
130 | } |
131 | ||
132 | /* One of the filters is NULL, fail. */ | |
133 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
134 | goto no_match; | |
135 | } | |
136 | ||
025faf73 DG |
137 | if (key->filter && event->filter) { |
138 | /* Both filters exists, check length followed by the bytecode. */ | |
139 | if (event->filter->len != key->filter->len || | |
140 | memcmp(event->filter->data, key->filter->data, | |
141 | event->filter->len) != 0) { | |
142 | goto no_match; | |
143 | } | |
18eace3b DG |
144 | } |
145 | ||
1af53eb5 JI |
146 | /* One of the exclusions is NULL, fail. */ |
147 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
148 | goto no_match; | |
149 | } | |
150 | ||
151 | if (key->exclusion && event->exclusion) { | |
152 | /* Both exclusions exists, check count followed by the names. */ | |
153 | if (event->exclusion->count != key->exclusion->count || | |
154 | memcmp(event->exclusion->names, key->exclusion->names, | |
155 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
156 | goto no_match; | |
157 | } | |
158 | } | |
159 | ||
160 | ||
025faf73 | 161 | /* Match. */ |
18eace3b DG |
162 | return 1; |
163 | ||
164 | no_match: | |
165 | return 0; | |
18eace3b DG |
166 | } |
167 | ||
025faf73 DG |
168 | /* |
169 | * Unique add of an ust app event in the given ht. This uses the custom | |
170 | * ht_match_ust_app_event match function and the event name as hash. | |
171 | */ | |
d0b96690 | 172 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
173 | struct ust_app_event *event) |
174 | { | |
175 | struct cds_lfht_node *node_ptr; | |
176 | struct ust_app_ht_key key; | |
d0b96690 | 177 | struct lttng_ht *ht; |
18eace3b | 178 | |
d0b96690 DG |
179 | assert(ua_chan); |
180 | assert(ua_chan->events); | |
18eace3b DG |
181 | assert(event); |
182 | ||
d0b96690 | 183 | ht = ua_chan->events; |
18eace3b DG |
184 | key.name = event->attr.name; |
185 | key.filter = event->filter; | |
186 | key.loglevel = event->attr.loglevel; | |
91c89f23 | 187 | key.exclusion = event->exclusion; |
18eace3b DG |
188 | |
189 | node_ptr = cds_lfht_add_unique(ht->ht, | |
190 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
191 | ht_match_ust_app_event, &key, &event->node.node); | |
192 | assert(node_ptr == &event->node.node); | |
193 | } | |
194 | ||
d88aee68 DG |
195 | /* |
196 | * Close the notify socket from the given RCU head object. This MUST be called | |
197 | * through a call_rcu(). | |
198 | */ | |
199 | static void close_notify_sock_rcu(struct rcu_head *head) | |
200 | { | |
201 | int ret; | |
202 | struct ust_app_notify_sock_obj *obj = | |
203 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
204 | ||
205 | /* Must have a valid fd here. */ | |
206 | assert(obj->fd >= 0); | |
207 | ||
208 | ret = close(obj->fd); | |
209 | if (ret) { | |
210 | ERR("close notify sock %d RCU", obj->fd); | |
211 | } | |
212 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
213 | ||
214 | free(obj); | |
215 | } | |
216 | ||
7972aab2 DG |
217 | /* |
218 | * Return the session registry according to the buffer type of the given | |
219 | * session. | |
220 | * | |
221 | * A registry per UID object MUST exists before calling this function or else | |
222 | * it assert() if not found. RCU read side lock must be acquired. | |
223 | */ | |
224 | static struct ust_registry_session *get_session_registry( | |
225 | struct ust_app_session *ua_sess) | |
226 | { | |
227 | struct ust_registry_session *registry = NULL; | |
228 | ||
229 | assert(ua_sess); | |
230 | ||
231 | switch (ua_sess->buffer_type) { | |
232 | case LTTNG_BUFFER_PER_PID: | |
233 | { | |
234 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
235 | if (!reg_pid) { | |
236 | goto error; | |
237 | } | |
238 | registry = reg_pid->registry->reg.ust; | |
239 | break; | |
240 | } | |
241 | case LTTNG_BUFFER_PER_UID: | |
242 | { | |
243 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
244 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
245 | if (!reg_uid) { | |
246 | goto error; | |
247 | } | |
248 | registry = reg_uid->registry->reg.ust; | |
249 | break; | |
250 | } | |
251 | default: | |
252 | assert(0); | |
253 | }; | |
254 | ||
255 | error: | |
256 | return registry; | |
257 | } | |
258 | ||
55cc08a6 DG |
259 | /* |
260 | * Delete ust context safely. RCU read lock must be held before calling | |
261 | * this function. | |
262 | */ | |
263 | static | |
264 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
265 | { | |
ffe60014 DG |
266 | int ret; |
267 | ||
268 | assert(ua_ctx); | |
269 | ||
55cc08a6 | 270 | if (ua_ctx->obj) { |
ffe60014 | 271 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
272 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
273 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
274 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 275 | } |
55cc08a6 DG |
276 | free(ua_ctx->obj); |
277 | } | |
278 | free(ua_ctx); | |
279 | } | |
280 | ||
d80a6244 DG |
281 | /* |
282 | * Delete ust app event safely. RCU read lock must be held before calling | |
283 | * this function. | |
284 | */ | |
8b366481 DG |
285 | static |
286 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 287 | { |
ffe60014 DG |
288 | int ret; |
289 | ||
290 | assert(ua_event); | |
291 | ||
53a80697 | 292 | free(ua_event->filter); |
951f0b71 JI |
293 | if (ua_event->exclusion != NULL) |
294 | free(ua_event->exclusion); | |
edb67388 | 295 | if (ua_event->obj != NULL) { |
ffe60014 DG |
296 | ret = ustctl_release_object(sock, ua_event->obj); |
297 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
298 | ERR("UST app sock %d release event obj failed with ret %d", | |
299 | sock, ret); | |
300 | } | |
edb67388 DG |
301 | free(ua_event->obj); |
302 | } | |
d80a6244 DG |
303 | free(ua_event); |
304 | } | |
305 | ||
306 | /* | |
7972aab2 DG |
307 | * Release ust data object of the given stream. |
308 | * | |
309 | * Return 0 on success or else a negative value. | |
d80a6244 | 310 | */ |
7972aab2 | 311 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 312 | { |
7972aab2 | 313 | int ret = 0; |
ffe60014 DG |
314 | |
315 | assert(stream); | |
316 | ||
8b366481 | 317 | if (stream->obj) { |
ffe60014 DG |
318 | ret = ustctl_release_object(sock, stream->obj); |
319 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
320 | ERR("UST app sock %d release stream obj failed with ret %d", | |
321 | sock, ret); | |
322 | } | |
4063050c | 323 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
324 | free(stream->obj); |
325 | } | |
7972aab2 DG |
326 | |
327 | return ret; | |
328 | } | |
329 | ||
330 | /* | |
331 | * Delete ust app stream safely. RCU read lock must be held before calling | |
332 | * this function. | |
333 | */ | |
334 | static | |
335 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
336 | { | |
337 | assert(stream); | |
338 | ||
339 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 340 | free(stream); |
d80a6244 DG |
341 | } |
342 | ||
36b588ed MD |
343 | /* |
344 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
345 | * section and outside of call_rcu thread, so we postpone its execution |
346 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
347 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
348 | */ |
349 | static | |
350 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
351 | { | |
352 | struct ust_app_channel *ua_chan = | |
353 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
354 | ||
0b2dc8df MD |
355 | ht_cleanup_push(ua_chan->ctx); |
356 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
357 | free(ua_chan); |
358 | } | |
359 | ||
d80a6244 DG |
360 | /* |
361 | * Delete ust app channel safely. RCU read lock must be held before calling | |
362 | * this function. | |
363 | */ | |
8b366481 | 364 | static |
d0b96690 DG |
365 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
366 | struct ust_app *app) | |
d80a6244 DG |
367 | { |
368 | int ret; | |
bec39940 | 369 | struct lttng_ht_iter iter; |
d80a6244 | 370 | struct ust_app_event *ua_event; |
55cc08a6 | 371 | struct ust_app_ctx *ua_ctx; |
030a66fa | 372 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 373 | struct ust_registry_session *registry; |
d80a6244 | 374 | |
ffe60014 DG |
375 | assert(ua_chan); |
376 | ||
377 | DBG3("UST app deleting channel %s", ua_chan->name); | |
378 | ||
55cc08a6 | 379 | /* Wipe stream */ |
d80a6244 | 380 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 381 | cds_list_del(&stream->list); |
d80a6244 DG |
382 | delete_ust_app_stream(sock, stream); |
383 | } | |
384 | ||
55cc08a6 | 385 | /* Wipe context */ |
bec39940 | 386 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 387 | cds_list_del(&ua_ctx->list); |
bec39940 | 388 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 DG |
389 | assert(!ret); |
390 | delete_ust_app_ctx(sock, ua_ctx); | |
391 | } | |
d80a6244 | 392 | |
55cc08a6 | 393 | /* Wipe events */ |
bec39940 DG |
394 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
395 | node.node) { | |
396 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 397 | assert(!ret); |
d80a6244 DG |
398 | delete_ust_app_event(sock, ua_event); |
399 | } | |
edb67388 | 400 | |
c8335706 MD |
401 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
402 | /* Wipe and free registry from session registry. */ | |
403 | registry = get_session_registry(ua_chan->session); | |
404 | if (registry) { | |
405 | ust_registry_channel_del_free(registry, ua_chan->key); | |
406 | } | |
7972aab2 | 407 | } |
d0b96690 | 408 | |
edb67388 | 409 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
410 | /* Remove channel from application UST object descriptor. */ |
411 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
412 | ret = lttng_ht_del(app->ust_objd, &iter); |
413 | assert(!ret); | |
ffe60014 DG |
414 | ret = ustctl_release_object(sock, ua_chan->obj); |
415 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
416 | ERR("UST app sock %d release channel obj failed with ret %d", | |
417 | sock, ret); | |
418 | } | |
7972aab2 | 419 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
420 | free(ua_chan->obj); |
421 | } | |
36b588ed | 422 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
423 | } |
424 | ||
331744e3 | 425 | /* |
1b532a60 DG |
426 | * Push metadata to consumer socket. |
427 | * | |
428 | * The socket lock MUST be acquired. | |
429 | * The ust app session lock MUST be acquired. | |
331744e3 JD |
430 | * |
431 | * On success, return the len of metadata pushed or else a negative value. | |
432 | */ | |
433 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
434 | struct consumer_socket *socket, int send_zero_data) | |
435 | { | |
436 | int ret; | |
437 | char *metadata_str = NULL; | |
438 | size_t len, offset; | |
439 | ssize_t ret_val; | |
440 | ||
441 | assert(registry); | |
442 | assert(socket); | |
1b532a60 DG |
443 | |
444 | /* | |
445 | * On a push metadata error either the consumer is dead or the metadata | |
446 | * channel has been destroyed because its endpoint might have died (e.g: | |
447 | * relayd). If so, the metadata closed flag is set to 1 so we deny pushing | |
448 | * metadata again which is not valid anymore on the consumer side. | |
449 | * | |
450 | * The ust app session mutex locked allows us to make this check without | |
451 | * the registry lock. | |
452 | */ | |
453 | if (registry->metadata_closed) { | |
454 | return -EPIPE; | |
455 | } | |
331744e3 JD |
456 | |
457 | pthread_mutex_lock(®istry->lock); | |
458 | ||
459 | offset = registry->metadata_len_sent; | |
460 | len = registry->metadata_len - registry->metadata_len_sent; | |
461 | if (len == 0) { | |
462 | DBG3("No metadata to push for metadata key %" PRIu64, | |
463 | registry->metadata_key); | |
464 | ret_val = len; | |
465 | if (send_zero_data) { | |
466 | DBG("No metadata to push"); | |
467 | goto push_data; | |
468 | } | |
469 | goto end; | |
470 | } | |
471 | ||
472 | /* Allocate only what we have to send. */ | |
473 | metadata_str = zmalloc(len); | |
474 | if (!metadata_str) { | |
475 | PERROR("zmalloc ust app metadata string"); | |
476 | ret_val = -ENOMEM; | |
477 | goto error; | |
478 | } | |
479 | /* Copy what we haven't send out. */ | |
480 | memcpy(metadata_str, registry->metadata + offset, len); | |
481 | registry->metadata_len_sent += len; | |
482 | ||
483 | push_data: | |
484 | pthread_mutex_unlock(®istry->lock); | |
485 | ret = consumer_push_metadata(socket, registry->metadata_key, | |
486 | metadata_str, len, offset); | |
487 | if (ret < 0) { | |
000baf6a DG |
488 | /* |
489 | * There is an acceptable race here between the registry metadata key | |
490 | * assignment and the creation on the consumer. The session daemon can | |
491 | * concurrently push metadata for this registry while being created on | |
492 | * the consumer since the metadata key of the registry is assigned | |
493 | * *before* it is setup to avoid the consumer to ask for metadata that | |
494 | * could possibly be not found in the session daemon. | |
495 | * | |
496 | * The metadata will get pushed either by the session being stopped or | |
497 | * the consumer requesting metadata if that race is triggered. | |
498 | */ | |
499 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
500 | ret = 0; | |
501 | } | |
ffa3f245 DG |
502 | |
503 | /* Update back the actual metadata len sent since it failed here. */ | |
504 | pthread_mutex_lock(®istry->lock); | |
505 | registry->metadata_len_sent -= len; | |
506 | pthread_mutex_unlock(®istry->lock); | |
331744e3 JD |
507 | ret_val = ret; |
508 | goto error_push; | |
509 | } | |
510 | ||
511 | free(metadata_str); | |
512 | return len; | |
513 | ||
514 | end: | |
515 | error: | |
516 | pthread_mutex_unlock(®istry->lock); | |
517 | error_push: | |
518 | free(metadata_str); | |
519 | return ret_val; | |
520 | } | |
521 | ||
d88aee68 DG |
522 | /* |
523 | * For a given application and session, push metadata to consumer. The session | |
524 | * lock MUST be acquired here before calling this. | |
331744e3 JD |
525 | * Either sock or consumer is required : if sock is NULL, the default |
526 | * socket to send the metadata is retrieved from consumer, if sock | |
527 | * is not NULL we use it to send the metadata. | |
d88aee68 DG |
528 | * |
529 | * Return 0 on success else a negative error. | |
530 | */ | |
7972aab2 DG |
531 | static int push_metadata(struct ust_registry_session *registry, |
532 | struct consumer_output *consumer) | |
d88aee68 | 533 | { |
331744e3 JD |
534 | int ret_val; |
535 | ssize_t ret; | |
d88aee68 DG |
536 | struct consumer_socket *socket; |
537 | ||
7972aab2 DG |
538 | assert(registry); |
539 | assert(consumer); | |
540 | ||
541 | rcu_read_lock(); | |
d88aee68 | 542 | |
7972aab2 DG |
543 | /* |
544 | * Means that no metadata was assigned to the session. This can happens if | |
545 | * no start has been done previously. | |
546 | */ | |
547 | if (!registry->metadata_key) { | |
331744e3 | 548 | ret_val = 0; |
1b532a60 | 549 | goto end_rcu_unlock; |
d88aee68 DG |
550 | } |
551 | ||
d88aee68 | 552 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
553 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
554 | consumer); | |
d88aee68 | 555 | if (!socket) { |
331744e3 | 556 | ret_val = -1; |
d88aee68 DG |
557 | goto error_rcu_unlock; |
558 | } | |
559 | ||
560 | /* | |
561 | * TODO: Currently, we hold the socket lock around sampling of the next | |
562 | * metadata segment to ensure we send metadata over the consumer socket in | |
563 | * the correct order. This makes the registry lock nest inside the socket | |
564 | * lock. | |
565 | * | |
566 | * Please note that this is a temporary measure: we should move this lock | |
567 | * back into ust_consumer_push_metadata() when the consumer gets the | |
568 | * ability to reorder the metadata it receives. | |
569 | */ | |
570 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
571 | ret = ust_app_push_metadata(registry, socket, 0); |
572 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 573 | if (ret < 0) { |
331744e3 | 574 | ret_val = ret; |
d88aee68 DG |
575 | goto error_rcu_unlock; |
576 | } | |
577 | ||
d88aee68 | 578 | rcu_read_unlock(); |
d88aee68 DG |
579 | return 0; |
580 | ||
d88aee68 | 581 | error_rcu_unlock: |
1b532a60 DG |
582 | /* |
583 | * On error, flag the registry that the metadata is closed. We were unable | |
584 | * to push anything and this means that either the consumer is not | |
585 | * responding or the metadata cache has been destroyed on the consumer. | |
586 | */ | |
587 | registry->metadata_closed = 1; | |
588 | end_rcu_unlock: | |
d88aee68 | 589 | rcu_read_unlock(); |
331744e3 | 590 | return ret_val; |
d88aee68 DG |
591 | } |
592 | ||
593 | /* | |
594 | * Send to the consumer a close metadata command for the given session. Once | |
595 | * done, the metadata channel is deleted and the session metadata pointer is | |
596 | * nullified. The session lock MUST be acquired here unless the application is | |
597 | * in the destroy path. | |
598 | * | |
599 | * Return 0 on success else a negative value. | |
600 | */ | |
7972aab2 DG |
601 | static int close_metadata(struct ust_registry_session *registry, |
602 | struct consumer_output *consumer) | |
d88aee68 DG |
603 | { |
604 | int ret; | |
605 | struct consumer_socket *socket; | |
606 | ||
7972aab2 DG |
607 | assert(registry); |
608 | assert(consumer); | |
d88aee68 | 609 | |
7972aab2 DG |
610 | rcu_read_lock(); |
611 | ||
612 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 | 613 | ret = 0; |
1b532a60 | 614 | goto end; |
d88aee68 DG |
615 | } |
616 | ||
d88aee68 | 617 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
618 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
619 | consumer); | |
d88aee68 DG |
620 | if (!socket) { |
621 | ret = -1; | |
7972aab2 | 622 | goto error; |
d88aee68 DG |
623 | } |
624 | ||
7972aab2 | 625 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 626 | if (ret < 0) { |
7972aab2 | 627 | goto error; |
d88aee68 DG |
628 | } |
629 | ||
d88aee68 | 630 | error: |
1b532a60 DG |
631 | /* |
632 | * Metadata closed. Even on error this means that the consumer is not | |
633 | * responding or not found so either way a second close should NOT be emit | |
634 | * for this registry. | |
635 | */ | |
636 | registry->metadata_closed = 1; | |
637 | end: | |
7972aab2 | 638 | rcu_read_unlock(); |
d88aee68 DG |
639 | return ret; |
640 | } | |
641 | ||
36b588ed MD |
642 | /* |
643 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
644 | * section and outside of call_rcu thread, so we postpone its execution |
645 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
646 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
647 | */ |
648 | static | |
649 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
650 | { | |
651 | struct ust_app_session *ua_sess = | |
652 | caa_container_of(head, struct ust_app_session, rcu_head); | |
653 | ||
0b2dc8df | 654 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
655 | free(ua_sess); |
656 | } | |
657 | ||
d80a6244 DG |
658 | /* |
659 | * Delete ust app session safely. RCU read lock must be held before calling | |
660 | * this function. | |
661 | */ | |
8b366481 | 662 | static |
d0b96690 DG |
663 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
664 | struct ust_app *app) | |
d80a6244 DG |
665 | { |
666 | int ret; | |
bec39940 | 667 | struct lttng_ht_iter iter; |
d80a6244 | 668 | struct ust_app_channel *ua_chan; |
7972aab2 | 669 | struct ust_registry_session *registry; |
d80a6244 | 670 | |
d88aee68 DG |
671 | assert(ua_sess); |
672 | ||
1b532a60 DG |
673 | pthread_mutex_lock(&ua_sess->lock); |
674 | ||
7972aab2 | 675 | registry = get_session_registry(ua_sess); |
1b532a60 | 676 | if (registry && !registry->metadata_closed) { |
d88aee68 | 677 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 678 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 679 | |
7972aab2 DG |
680 | /* |
681 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
682 | * metadata only on destroy trace session in this case. Also, the |
683 | * previous push metadata could have flag the metadata registry to | |
684 | * close so don't send a close command if closed. | |
7972aab2 | 685 | */ |
1b532a60 DG |
686 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
687 | !registry->metadata_closed) { | |
7972aab2 DG |
688 | /* And ask to close it for this session registry. */ |
689 | (void) close_metadata(registry, ua_sess->consumer); | |
690 | } | |
d80a6244 DG |
691 | } |
692 | ||
bec39940 DG |
693 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
694 | node.node) { | |
695 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 696 | assert(!ret); |
d0b96690 | 697 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 698 | } |
d80a6244 | 699 | |
7972aab2 DG |
700 | /* In case of per PID, the registry is kept in the session. */ |
701 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
702 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
703 | if (reg_pid) { | |
704 | buffer_reg_pid_remove(reg_pid); | |
705 | buffer_reg_pid_destroy(reg_pid); | |
706 | } | |
707 | } | |
d0b96690 | 708 | |
aee6bafd | 709 | if (ua_sess->handle != -1) { |
ffe60014 DG |
710 | ret = ustctl_release_handle(sock, ua_sess->handle); |
711 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
712 | ERR("UST app sock %d release session handle failed with ret %d", | |
713 | sock, ret); | |
714 | } | |
aee6bafd | 715 | } |
1b532a60 DG |
716 | pthread_mutex_unlock(&ua_sess->lock); |
717 | ||
36b588ed | 718 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 719 | } |
91d76f53 DG |
720 | |
721 | /* | |
284d8f55 DG |
722 | * Delete a traceable application structure from the global list. Never call |
723 | * this function outside of a call_rcu call. | |
36b588ed MD |
724 | * |
725 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 726 | */ |
8b366481 DG |
727 | static |
728 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 729 | { |
8b366481 | 730 | int ret, sock; |
d42f20df | 731 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 732 | |
d80a6244 | 733 | /* Delete ust app sessions info */ |
852d0037 DG |
734 | sock = app->sock; |
735 | app->sock = -1; | |
d80a6244 | 736 | |
8b366481 | 737 | /* Wipe sessions */ |
d42f20df DG |
738 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
739 | teardown_node) { | |
740 | /* Free every object in the session and the session. */ | |
36b588ed | 741 | rcu_read_lock(); |
d0b96690 | 742 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 743 | rcu_read_unlock(); |
d80a6244 | 744 | } |
36b588ed | 745 | |
0b2dc8df MD |
746 | ht_cleanup_push(app->sessions); |
747 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 748 | |
6414a713 | 749 | /* |
852d0037 DG |
750 | * Wait until we have deleted the application from the sock hash table |
751 | * before closing this socket, otherwise an application could re-use the | |
752 | * socket ID and race with the teardown, using the same hash table entry. | |
753 | * | |
754 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
755 | * all RCU readers that could run concurrently with unregister app, | |
756 | * therefore we _need_ to only close that socket after a grace period. So | |
757 | * it should stay in this RCU callback. | |
758 | * | |
759 | * This close() is a very important step of the synchronization model so | |
760 | * every modification to this function must be carefully reviewed. | |
6414a713 | 761 | */ |
799e2c4f MD |
762 | ret = close(sock); |
763 | if (ret) { | |
764 | PERROR("close"); | |
765 | } | |
4063050c | 766 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 767 | |
852d0037 | 768 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 769 | free(app); |
099e26bd DG |
770 | } |
771 | ||
772 | /* | |
f6a9efaa | 773 | * URCU intermediate call to delete an UST app. |
099e26bd | 774 | */ |
8b366481 DG |
775 | static |
776 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 777 | { |
bec39940 DG |
778 | struct lttng_ht_node_ulong *node = |
779 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 780 | struct ust_app *app = |
852d0037 | 781 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 782 | |
852d0037 | 783 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 784 | delete_ust_app(app); |
099e26bd DG |
785 | } |
786 | ||
ffe60014 DG |
787 | /* |
788 | * Delete the session from the application ht and delete the data structure by | |
789 | * freeing every object inside and releasing them. | |
790 | */ | |
d0b96690 | 791 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
792 | struct ust_app_session *ua_sess) |
793 | { | |
794 | int ret; | |
795 | struct lttng_ht_iter iter; | |
796 | ||
797 | assert(app); | |
798 | assert(ua_sess); | |
799 | ||
800 | iter.iter.node = &ua_sess->node.node; | |
801 | ret = lttng_ht_del(app->sessions, &iter); | |
802 | if (ret) { | |
803 | /* Already scheduled for teardown. */ | |
804 | goto end; | |
805 | } | |
806 | ||
807 | /* Once deleted, free the data structure. */ | |
d0b96690 | 808 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
809 | |
810 | end: | |
811 | return; | |
812 | } | |
813 | ||
8b366481 DG |
814 | /* |
815 | * Alloc new UST app session. | |
816 | */ | |
817 | static | |
d0b96690 | 818 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
819 | { |
820 | struct ust_app_session *ua_sess; | |
821 | ||
822 | /* Init most of the default value by allocating and zeroing */ | |
823 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
824 | if (ua_sess == NULL) { | |
825 | PERROR("malloc"); | |
ffe60014 | 826 | goto error_free; |
8b366481 DG |
827 | } |
828 | ||
829 | ua_sess->handle = -1; | |
bec39940 | 830 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 831 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 832 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 833 | |
8b366481 DG |
834 | return ua_sess; |
835 | ||
ffe60014 | 836 | error_free: |
8b366481 DG |
837 | return NULL; |
838 | } | |
839 | ||
840 | /* | |
841 | * Alloc new UST app channel. | |
842 | */ | |
843 | static | |
844 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 845 | struct ust_app_session *ua_sess, |
ffe60014 | 846 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
847 | { |
848 | struct ust_app_channel *ua_chan; | |
849 | ||
850 | /* Init most of the default value by allocating and zeroing */ | |
851 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
852 | if (ua_chan == NULL) { | |
853 | PERROR("malloc"); | |
854 | goto error; | |
855 | } | |
856 | ||
857 | /* Setup channel name */ | |
858 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
859 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
860 | ||
861 | ua_chan->enabled = 1; | |
862 | ua_chan->handle = -1; | |
45893984 | 863 | ua_chan->session = ua_sess; |
ffe60014 | 864 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
865 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
866 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
867 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
868 | |
869 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 870 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
871 | |
872 | /* Copy attributes */ | |
873 | if (attr) { | |
ffe60014 | 874 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
875 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
876 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
877 | ua_chan->attr.overwrite = attr->overwrite; | |
878 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
879 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
880 | ua_chan->attr.output = attr->output; | |
8b366481 | 881 | } |
ffe60014 DG |
882 | /* By default, the channel is a per cpu channel. */ |
883 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
884 | |
885 | DBG3("UST app channel %s allocated", ua_chan->name); | |
886 | ||
887 | return ua_chan; | |
888 | ||
889 | error: | |
890 | return NULL; | |
891 | } | |
892 | ||
37f1c236 DG |
893 | /* |
894 | * Allocate and initialize a UST app stream. | |
895 | * | |
896 | * Return newly allocated stream pointer or NULL on error. | |
897 | */ | |
ffe60014 | 898 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
899 | { |
900 | struct ust_app_stream *stream = NULL; | |
901 | ||
902 | stream = zmalloc(sizeof(*stream)); | |
903 | if (stream == NULL) { | |
904 | PERROR("zmalloc ust app stream"); | |
905 | goto error; | |
906 | } | |
907 | ||
908 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
909 | stream->handle = -1; | |
910 | ||
911 | error: | |
912 | return stream; | |
913 | } | |
914 | ||
8b366481 DG |
915 | /* |
916 | * Alloc new UST app event. | |
917 | */ | |
918 | static | |
919 | struct ust_app_event *alloc_ust_app_event(char *name, | |
920 | struct lttng_ust_event *attr) | |
921 | { | |
922 | struct ust_app_event *ua_event; | |
923 | ||
924 | /* Init most of the default value by allocating and zeroing */ | |
925 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
926 | if (ua_event == NULL) { | |
927 | PERROR("malloc"); | |
928 | goto error; | |
929 | } | |
930 | ||
931 | ua_event->enabled = 1; | |
932 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
933 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 934 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
935 | |
936 | /* Copy attributes */ | |
937 | if (attr) { | |
938 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
939 | } | |
940 | ||
941 | DBG3("UST app event %s allocated", ua_event->name); | |
942 | ||
943 | return ua_event; | |
944 | ||
945 | error: | |
946 | return NULL; | |
947 | } | |
948 | ||
949 | /* | |
950 | * Alloc new UST app context. | |
951 | */ | |
952 | static | |
953 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
954 | { | |
955 | struct ust_app_ctx *ua_ctx; | |
956 | ||
957 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
958 | if (ua_ctx == NULL) { | |
959 | goto error; | |
960 | } | |
961 | ||
31746f93 DG |
962 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
963 | ||
8b366481 DG |
964 | if (uctx) { |
965 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
966 | } | |
967 | ||
968 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
969 | ||
970 | error: | |
971 | return ua_ctx; | |
972 | } | |
973 | ||
025faf73 DG |
974 | /* |
975 | * Allocate a filter and copy the given original filter. | |
976 | * | |
977 | * Return allocated filter or NULL on error. | |
978 | */ | |
979 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
980 | struct lttng_ust_filter_bytecode *orig_f) | |
981 | { | |
982 | struct lttng_ust_filter_bytecode *filter = NULL; | |
983 | ||
984 | /* Copy filter bytecode */ | |
985 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
986 | if (!filter) { | |
987 | PERROR("zmalloc alloc ust app filter"); | |
988 | goto error; | |
989 | } | |
990 | ||
991 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
992 | ||
993 | error: | |
994 | return filter; | |
995 | } | |
996 | ||
099e26bd | 997 | /* |
421cb601 DG |
998 | * Find an ust_app using the sock and return it. RCU read side lock must be |
999 | * held before calling this helper function. | |
099e26bd | 1000 | */ |
f20baf8e | 1001 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1002 | { |
bec39940 | 1003 | struct lttng_ht_node_ulong *node; |
bec39940 | 1004 | struct lttng_ht_iter iter; |
f6a9efaa | 1005 | |
852d0037 | 1006 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1007 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1008 | if (node == NULL) { |
1009 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1010 | goto error; |
1011 | } | |
852d0037 DG |
1012 | |
1013 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1014 | |
1015 | error: | |
1016 | return NULL; | |
099e26bd DG |
1017 | } |
1018 | ||
d0b96690 DG |
1019 | /* |
1020 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1021 | * be held before calling this helper function. | |
1022 | */ | |
1023 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1024 | { | |
1025 | struct lttng_ht_node_ulong *node; | |
1026 | struct lttng_ht_iter iter; | |
1027 | ||
1028 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1029 | &iter); | |
1030 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1031 | if (node == NULL) { | |
1032 | DBG2("UST app find by notify sock %d not found", sock); | |
1033 | goto error; | |
1034 | } | |
1035 | ||
1036 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1037 | ||
1038 | error: | |
1039 | return NULL; | |
1040 | } | |
1041 | ||
025faf73 DG |
1042 | /* |
1043 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1044 | * event loglevel. | |
1045 | * | |
1046 | * Return an ust_app_event object or NULL on error. | |
1047 | */ | |
18eace3b | 1048 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
39c5a3a7 JI |
1049 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel, |
1050 | const struct lttng_event_exclusion *exclusion) | |
18eace3b DG |
1051 | { |
1052 | struct lttng_ht_iter iter; | |
1053 | struct lttng_ht_node_str *node; | |
1054 | struct ust_app_event *event = NULL; | |
1055 | struct ust_app_ht_key key; | |
18eace3b DG |
1056 | |
1057 | assert(name); | |
1058 | assert(ht); | |
1059 | ||
1060 | /* Setup key for event lookup. */ | |
1061 | key.name = name; | |
1062 | key.filter = filter; | |
1063 | key.loglevel = loglevel; | |
39c5a3a7 JI |
1064 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
1065 | key.exclusion = (struct lttng_ust_event_exclusion *)exclusion; | |
18eace3b | 1066 | |
025faf73 DG |
1067 | /* Lookup using the event name as hash and a custom match fct. */ |
1068 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1069 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1070 | node = lttng_ht_iter_get_node_str(&iter); |
1071 | if (node == NULL) { | |
1072 | goto end; | |
1073 | } | |
1074 | ||
1075 | event = caa_container_of(node, struct ust_app_event, node); | |
1076 | ||
1077 | end: | |
18eace3b DG |
1078 | return event; |
1079 | } | |
1080 | ||
55cc08a6 DG |
1081 | /* |
1082 | * Create the channel context on the tracer. | |
d0b96690 DG |
1083 | * |
1084 | * Called with UST app session lock held. | |
55cc08a6 DG |
1085 | */ |
1086 | static | |
1087 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1088 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1089 | { | |
1090 | int ret; | |
1091 | ||
840cb59c | 1092 | health_code_update(); |
86acf0da | 1093 | |
852d0037 | 1094 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1095 | ua_chan->obj, &ua_ctx->obj); |
1096 | if (ret < 0) { | |
ffe60014 DG |
1097 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1098 | ERR("UST app create channel context failed for app (pid: %d) " | |
1099 | "with ret %d", app->pid, ret); | |
1100 | } else { | |
3757b385 DG |
1101 | /* |
1102 | * This is normal behavior, an application can die during the | |
1103 | * creation process. Don't report an error so the execution can | |
1104 | * continue normally. | |
1105 | */ | |
1106 | ret = 0; | |
ffe60014 DG |
1107 | DBG3("UST app disable event failed. Application is dead."); |
1108 | } | |
55cc08a6 DG |
1109 | goto error; |
1110 | } | |
1111 | ||
1112 | ua_ctx->handle = ua_ctx->obj->handle; | |
1113 | ||
d0b96690 DG |
1114 | DBG2("UST app context handle %d created successfully for channel %s", |
1115 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1116 | |
1117 | error: | |
840cb59c | 1118 | health_code_update(); |
55cc08a6 DG |
1119 | return ret; |
1120 | } | |
1121 | ||
53a80697 MD |
1122 | /* |
1123 | * Set the filter on the tracer. | |
1124 | */ | |
1125 | static | |
1126 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1127 | struct ust_app *app) | |
1128 | { | |
1129 | int ret; | |
1130 | ||
840cb59c | 1131 | health_code_update(); |
86acf0da | 1132 | |
53a80697 | 1133 | if (!ua_event->filter) { |
86acf0da DG |
1134 | ret = 0; |
1135 | goto error; | |
53a80697 MD |
1136 | } |
1137 | ||
1138 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1139 | ua_event->obj); | |
1140 | if (ret < 0) { | |
ffe60014 DG |
1141 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1142 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1143 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1144 | } else { | |
3757b385 DG |
1145 | /* |
1146 | * This is normal behavior, an application can die during the | |
1147 | * creation process. Don't report an error so the execution can | |
1148 | * continue normally. | |
1149 | */ | |
1150 | ret = 0; | |
ffe60014 DG |
1151 | DBG3("UST app filter event failed. Application is dead."); |
1152 | } | |
53a80697 MD |
1153 | goto error; |
1154 | } | |
1155 | ||
1156 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1157 | ||
1158 | error: | |
840cb59c | 1159 | health_code_update(); |
53a80697 MD |
1160 | return ret; |
1161 | } | |
1162 | ||
7cc9a73c JI |
1163 | /* |
1164 | * Set event exclusions on the tracer. | |
1165 | */ | |
1166 | static | |
1167 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1168 | struct ust_app *app) | |
1169 | { | |
1170 | int ret; | |
1171 | ||
1172 | health_code_update(); | |
1173 | ||
1174 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1175 | ret = 0; | |
1176 | goto error; | |
1177 | } | |
1178 | ||
1179 | ret = ustctl_set_exclusion(app->sock, ua_event->exclusion, | |
1180 | ua_event->obj); | |
1181 | if (ret < 0) { | |
1182 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1183 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1184 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1185 | } else { | |
1186 | /* | |
1187 | * This is normal behavior, an application can die during the | |
1188 | * creation process. Don't report an error so the execution can | |
1189 | * continue normally. | |
1190 | */ | |
1191 | ret = 0; | |
1192 | DBG3("UST app event exclusion failed. Application is dead."); | |
1193 | } | |
1194 | goto error; | |
1195 | } | |
1196 | ||
1197 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1198 | ||
1199 | error: | |
1200 | health_code_update(); | |
1201 | return ret; | |
1202 | } | |
1203 | ||
9730260e DG |
1204 | /* |
1205 | * Disable the specified event on to UST tracer for the UST session. | |
1206 | */ | |
1207 | static int disable_ust_event(struct ust_app *app, | |
1208 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1209 | { | |
1210 | int ret; | |
1211 | ||
840cb59c | 1212 | health_code_update(); |
86acf0da | 1213 | |
852d0037 | 1214 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1215 | if (ret < 0) { |
ffe60014 DG |
1216 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1217 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1218 | "and session handle %d with ret %d", | |
1219 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1220 | } else { | |
3757b385 DG |
1221 | /* |
1222 | * This is normal behavior, an application can die during the | |
1223 | * creation process. Don't report an error so the execution can | |
1224 | * continue normally. | |
1225 | */ | |
1226 | ret = 0; | |
ffe60014 DG |
1227 | DBG3("UST app disable event failed. Application is dead."); |
1228 | } | |
9730260e DG |
1229 | goto error; |
1230 | } | |
1231 | ||
1232 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1233 | ua_event->attr.name, app->pid); |
9730260e DG |
1234 | |
1235 | error: | |
840cb59c | 1236 | health_code_update(); |
9730260e DG |
1237 | return ret; |
1238 | } | |
1239 | ||
78f0bacd DG |
1240 | /* |
1241 | * Disable the specified channel on to UST tracer for the UST session. | |
1242 | */ | |
1243 | static int disable_ust_channel(struct ust_app *app, | |
1244 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1245 | { | |
1246 | int ret; | |
1247 | ||
840cb59c | 1248 | health_code_update(); |
86acf0da | 1249 | |
852d0037 | 1250 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1251 | if (ret < 0) { |
ffe60014 DG |
1252 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1253 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1254 | "and session handle %d with ret %d", | |
1255 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1256 | } else { | |
3757b385 DG |
1257 | /* |
1258 | * This is normal behavior, an application can die during the | |
1259 | * creation process. Don't report an error so the execution can | |
1260 | * continue normally. | |
1261 | */ | |
1262 | ret = 0; | |
ffe60014 DG |
1263 | DBG3("UST app disable channel failed. Application is dead."); |
1264 | } | |
78f0bacd DG |
1265 | goto error; |
1266 | } | |
1267 | ||
78f0bacd | 1268 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1269 | ua_chan->name, app->pid); |
78f0bacd DG |
1270 | |
1271 | error: | |
840cb59c | 1272 | health_code_update(); |
78f0bacd DG |
1273 | return ret; |
1274 | } | |
1275 | ||
1276 | /* | |
1277 | * Enable the specified channel on to UST tracer for the UST session. | |
1278 | */ | |
1279 | static int enable_ust_channel(struct ust_app *app, | |
1280 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1281 | { | |
1282 | int ret; | |
1283 | ||
840cb59c | 1284 | health_code_update(); |
86acf0da | 1285 | |
852d0037 | 1286 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1287 | if (ret < 0) { |
ffe60014 DG |
1288 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1289 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1290 | "and session handle %d with ret %d", | |
1291 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1292 | } else { | |
3757b385 DG |
1293 | /* |
1294 | * This is normal behavior, an application can die during the | |
1295 | * creation process. Don't report an error so the execution can | |
1296 | * continue normally. | |
1297 | */ | |
1298 | ret = 0; | |
ffe60014 DG |
1299 | DBG3("UST app enable channel failed. Application is dead."); |
1300 | } | |
78f0bacd DG |
1301 | goto error; |
1302 | } | |
1303 | ||
1304 | ua_chan->enabled = 1; | |
1305 | ||
1306 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1307 | ua_chan->name, app->pid); |
78f0bacd DG |
1308 | |
1309 | error: | |
840cb59c | 1310 | health_code_update(); |
78f0bacd DG |
1311 | return ret; |
1312 | } | |
1313 | ||
edb67388 DG |
1314 | /* |
1315 | * Enable the specified event on to UST tracer for the UST session. | |
1316 | */ | |
1317 | static int enable_ust_event(struct ust_app *app, | |
1318 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1319 | { | |
1320 | int ret; | |
1321 | ||
840cb59c | 1322 | health_code_update(); |
86acf0da | 1323 | |
852d0037 | 1324 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1325 | if (ret < 0) { |
ffe60014 DG |
1326 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1327 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1328 | "and session handle %d with ret %d", | |
1329 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1330 | } else { | |
3757b385 DG |
1331 | /* |
1332 | * This is normal behavior, an application can die during the | |
1333 | * creation process. Don't report an error so the execution can | |
1334 | * continue normally. | |
1335 | */ | |
1336 | ret = 0; | |
ffe60014 DG |
1337 | DBG3("UST app enable event failed. Application is dead."); |
1338 | } | |
edb67388 DG |
1339 | goto error; |
1340 | } | |
1341 | ||
1342 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1343 | ua_event->attr.name, app->pid); |
edb67388 DG |
1344 | |
1345 | error: | |
840cb59c | 1346 | health_code_update(); |
edb67388 DG |
1347 | return ret; |
1348 | } | |
1349 | ||
099e26bd | 1350 | /* |
7972aab2 | 1351 | * Send channel and stream buffer to application. |
4f3ab6ee | 1352 | * |
ffe60014 | 1353 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1354 | */ |
7972aab2 DG |
1355 | static int send_channel_pid_to_ust(struct ust_app *app, |
1356 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1357 | { |
1358 | int ret; | |
ffe60014 | 1359 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1360 | |
1361 | assert(app); | |
ffe60014 | 1362 | assert(ua_sess); |
4f3ab6ee | 1363 | assert(ua_chan); |
4f3ab6ee | 1364 | |
840cb59c | 1365 | health_code_update(); |
4f3ab6ee | 1366 | |
7972aab2 DG |
1367 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1368 | app->sock); | |
86acf0da | 1369 | |
ffe60014 DG |
1370 | /* Send channel to the application. */ |
1371 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1372 | if (ret < 0) { |
b551a063 DG |
1373 | goto error; |
1374 | } | |
1375 | ||
d88aee68 DG |
1376 | health_code_update(); |
1377 | ||
ffe60014 DG |
1378 | /* Send all streams to application. */ |
1379 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1380 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1381 | if (ret < 0) { | |
1382 | goto error; | |
1383 | } | |
1384 | /* We don't need the stream anymore once sent to the tracer. */ | |
1385 | cds_list_del(&stream->list); | |
1386 | delete_ust_app_stream(-1, stream); | |
1387 | } | |
ffe60014 DG |
1388 | /* Flag the channel that it is sent to the application. */ |
1389 | ua_chan->is_sent = 1; | |
ffe60014 | 1390 | |
b551a063 | 1391 | error: |
840cb59c | 1392 | health_code_update(); |
b551a063 DG |
1393 | return ret; |
1394 | } | |
1395 | ||
91d76f53 | 1396 | /* |
5b4a0ec0 | 1397 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1398 | * |
1399 | * Should be called with session mutex held. | |
91d76f53 | 1400 | */ |
edb67388 DG |
1401 | static |
1402 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1403 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1404 | { |
5b4a0ec0 | 1405 | int ret = 0; |
284d8f55 | 1406 | |
840cb59c | 1407 | health_code_update(); |
86acf0da | 1408 | |
5b4a0ec0 | 1409 | /* Create UST event on tracer */ |
852d0037 | 1410 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1411 | &ua_event->obj); |
1412 | if (ret < 0) { | |
ffe60014 DG |
1413 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1414 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1415 | ua_event->attr.name, app->pid, ret); | |
1416 | } else { | |
3757b385 DG |
1417 | /* |
1418 | * This is normal behavior, an application can die during the | |
1419 | * creation process. Don't report an error so the execution can | |
1420 | * continue normally. | |
1421 | */ | |
1422 | ret = 0; | |
ffe60014 DG |
1423 | DBG3("UST app create event failed. Application is dead."); |
1424 | } | |
5b4a0ec0 | 1425 | goto error; |
91d76f53 | 1426 | } |
f6a9efaa | 1427 | |
5b4a0ec0 | 1428 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1429 | |
5b4a0ec0 | 1430 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1431 | ua_event->attr.name, app->pid); |
f6a9efaa | 1432 | |
840cb59c | 1433 | health_code_update(); |
86acf0da | 1434 | |
025faf73 DG |
1435 | /* Set filter if one is present. */ |
1436 | if (ua_event->filter) { | |
1437 | ret = set_ust_event_filter(ua_event, app); | |
1438 | if (ret < 0) { | |
1439 | goto error; | |
1440 | } | |
1441 | } | |
1442 | ||
7cc9a73c JI |
1443 | /* Set exclusions for the event */ |
1444 | if (ua_event->exclusion) { | |
1445 | ret = set_ust_event_exclusion(ua_event, app); | |
1446 | if (ret < 0) { | |
1447 | goto error; | |
1448 | } | |
1449 | } | |
1450 | ||
8535a6d9 | 1451 | /* If event not enabled, disable it on the tracer */ |
15febfee MD |
1452 | if (ua_event->enabled) { |
1453 | /* | |
1454 | * We now need to explicitly enable the event, since it | |
1455 | * is now disabled at creation. | |
1456 | */ | |
1457 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1458 | if (ret < 0) { | |
1459 | /* | |
1460 | * If we hit an EPERM, something is wrong with our enable call. If | |
1461 | * we get an EEXIST, there is a problem on the tracer side since we | |
1462 | * just created it. | |
1463 | */ | |
1464 | switch (ret) { | |
1465 | case -LTTNG_UST_ERR_PERM: | |
1466 | /* Code flow problem */ | |
1467 | assert(0); | |
1468 | case -LTTNG_UST_ERR_EXIST: | |
1469 | /* It's OK for our use case. */ | |
1470 | ret = 0; | |
1471 | break; | |
1472 | default: | |
1473 | break; | |
1474 | } | |
1475 | goto error; | |
1476 | } | |
1477 | } else { | |
8535a6d9 DG |
1478 | ret = disable_ust_event(app, ua_sess, ua_event); |
1479 | if (ret < 0) { | |
fc34caaa DG |
1480 | /* |
1481 | * If we hit an EPERM, something is wrong with our disable call. If | |
1482 | * we get an EEXIST, there is a problem on the tracer side since we | |
1483 | * just created it. | |
1484 | */ | |
1485 | switch (ret) { | |
49c336c1 | 1486 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1487 | /* Code flow problem */ |
1488 | assert(0); | |
49c336c1 | 1489 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1490 | /* It's OK for our use case. */ |
1491 | ret = 0; | |
1492 | break; | |
1493 | default: | |
1494 | break; | |
1495 | } | |
8535a6d9 DG |
1496 | goto error; |
1497 | } | |
1498 | } | |
1499 | ||
5b4a0ec0 | 1500 | error: |
840cb59c | 1501 | health_code_update(); |
5b4a0ec0 | 1502 | return ret; |
91d76f53 | 1503 | } |
48842b30 | 1504 | |
5b4a0ec0 DG |
1505 | /* |
1506 | * Copy data between an UST app event and a LTT event. | |
1507 | */ | |
421cb601 | 1508 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1509 | struct ltt_ust_event *uevent) |
1510 | { | |
b4ffad32 JI |
1511 | size_t exclusion_alloc_size; |
1512 | ||
48842b30 DG |
1513 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1514 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1515 | ||
fc34caaa DG |
1516 | ua_event->enabled = uevent->enabled; |
1517 | ||
5b4a0ec0 DG |
1518 | /* Copy event attributes */ |
1519 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1520 | ||
53a80697 MD |
1521 | /* Copy filter bytecode */ |
1522 | if (uevent->filter) { | |
025faf73 DG |
1523 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1524 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1525 | } |
b4ffad32 JI |
1526 | |
1527 | /* Copy exclusion data */ | |
1528 | if (uevent->exclusion) { | |
1529 | exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1530 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; | |
1531 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1532 | if (ua_event->exclusion == NULL) { |
1533 | PERROR("malloc"); | |
1534 | } else { | |
1535 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1536 | exclusion_alloc_size); | |
b4ffad32 JI |
1537 | } |
1538 | } | |
48842b30 DG |
1539 | } |
1540 | ||
5b4a0ec0 DG |
1541 | /* |
1542 | * Copy data between an UST app channel and a LTT channel. | |
1543 | */ | |
421cb601 | 1544 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1545 | struct ltt_ust_channel *uchan) |
1546 | { | |
bec39940 | 1547 | struct lttng_ht_iter iter; |
48842b30 | 1548 | struct ltt_ust_event *uevent; |
55cc08a6 | 1549 | struct ltt_ust_context *uctx; |
48842b30 | 1550 | struct ust_app_event *ua_event; |
55cc08a6 | 1551 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1552 | |
fc34caaa | 1553 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1554 | |
1555 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1556 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1557 | |
1624d5b7 JD |
1558 | ua_chan->tracefile_size = uchan->tracefile_size; |
1559 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1560 | ||
ffe60014 DG |
1561 | /* Copy event attributes since the layout is different. */ |
1562 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1563 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1564 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1565 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1566 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1567 | ua_chan->attr.output = uchan->attr.output; | |
1568 | /* | |
1569 | * Note that the attribute channel type is not set since the channel on the | |
1570 | * tracing registry side does not have this information. | |
1571 | */ | |
48842b30 | 1572 | |
fc34caaa | 1573 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1574 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1575 | |
31746f93 | 1576 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1577 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1578 | if (ua_ctx == NULL) { | |
1579 | continue; | |
1580 | } | |
bec39940 DG |
1581 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1582 | (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 1583 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 1584 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1585 | } |
48842b30 | 1586 | |
421cb601 | 1587 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1588 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1589 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1590 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1591 | if (ua_event == NULL) { |
421cb601 | 1592 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1593 | uevent->attr.name); |
284d8f55 | 1594 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1595 | if (ua_event == NULL) { |
5b4a0ec0 | 1596 | continue; |
48842b30 | 1597 | } |
421cb601 | 1598 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1599 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1600 | } |
48842b30 DG |
1601 | } |
1602 | ||
fc34caaa | 1603 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1604 | } |
1605 | ||
5b4a0ec0 DG |
1606 | /* |
1607 | * Copy data between a UST app session and a regular LTT session. | |
1608 | */ | |
421cb601 | 1609 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1610 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1611 | { |
bec39940 DG |
1612 | struct lttng_ht_node_str *ua_chan_node; |
1613 | struct lttng_ht_iter iter; | |
48842b30 DG |
1614 | struct ltt_ust_channel *uchan; |
1615 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1616 | time_t rawtime; |
1617 | struct tm *timeinfo; | |
1618 | char datetime[16]; | |
1619 | int ret; | |
1620 | ||
1621 | /* Get date and time for unique app path */ | |
1622 | time(&rawtime); | |
1623 | timeinfo = localtime(&rawtime); | |
1624 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1625 | |
421cb601 | 1626 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1627 | |
7972aab2 DG |
1628 | ua_sess->tracing_id = usess->id; |
1629 | ua_sess->id = get_next_session_id(); | |
1630 | ua_sess->uid = app->uid; | |
1631 | ua_sess->gid = app->gid; | |
1632 | ua_sess->euid = usess->uid; | |
1633 | ua_sess->egid = usess->gid; | |
1634 | ua_sess->buffer_type = usess->buffer_type; | |
1635 | ua_sess->bits_per_long = app->bits_per_long; | |
1636 | /* There is only one consumer object per session possible. */ | |
1637 | ua_sess->consumer = usess->consumer; | |
2bba9e53 | 1638 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1639 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1640 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1641 | &usess->metadata_attr); | |
7972aab2 DG |
1642 | |
1643 | switch (ua_sess->buffer_type) { | |
1644 | case LTTNG_BUFFER_PER_PID: | |
1645 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1646 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1647 | datetime); |
1648 | break; | |
1649 | case LTTNG_BUFFER_PER_UID: | |
1650 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1651 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1652 | break; | |
1653 | default: | |
1654 | assert(0); | |
1655 | goto error; | |
1656 | } | |
477d7741 MD |
1657 | if (ret < 0) { |
1658 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1659 | assert(0); |
7972aab2 | 1660 | goto error; |
477d7741 MD |
1661 | } |
1662 | ||
48842b30 | 1663 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1664 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1665 | uchan, node.node) { | |
1666 | struct lttng_ht_iter uiter; | |
ba767faf | 1667 | |
bec39940 DG |
1668 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1669 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1670 | if (ua_chan_node != NULL) { |
fc34caaa | 1671 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1672 | continue; |
1673 | } | |
421cb601 | 1674 | |
5b4a0ec0 DG |
1675 | DBG2("Channel %s not found on shadow session copy, creating it", |
1676 | uchan->name); | |
d0b96690 | 1677 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1678 | if (ua_chan == NULL) { |
fc34caaa | 1679 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1680 | continue; |
48842b30 | 1681 | } |
5b4a0ec0 | 1682 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1683 | /* |
1684 | * The concept of metadata channel does not exist on the tracing | |
1685 | * registry side of the session daemon so this can only be a per CPU | |
1686 | * channel and not metadata. | |
1687 | */ | |
1688 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1689 | ||
bec39940 | 1690 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1691 | } |
7972aab2 DG |
1692 | |
1693 | error: | |
1694 | return; | |
48842b30 DG |
1695 | } |
1696 | ||
78f0bacd DG |
1697 | /* |
1698 | * Lookup sesison wrapper. | |
1699 | */ | |
84cd17c6 MD |
1700 | static |
1701 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1702 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1703 | { |
1704 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1705 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1706 | } |
1707 | ||
421cb601 DG |
1708 | /* |
1709 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1710 | * id. |
421cb601 | 1711 | */ |
48842b30 DG |
1712 | static struct ust_app_session *lookup_session_by_app( |
1713 | struct ltt_ust_session *usess, struct ust_app *app) | |
1714 | { | |
bec39940 | 1715 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1716 | struct lttng_ht_node_u64 *node; |
48842b30 | 1717 | |
84cd17c6 | 1718 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1719 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1720 | if (node == NULL) { |
1721 | goto error; | |
1722 | } | |
1723 | ||
1724 | return caa_container_of(node, struct ust_app_session, node); | |
1725 | ||
1726 | error: | |
1727 | return NULL; | |
1728 | } | |
1729 | ||
7972aab2 DG |
1730 | /* |
1731 | * Setup buffer registry per PID for the given session and application. If none | |
1732 | * is found, a new one is created, added to the global registry and | |
1733 | * initialized. If regp is valid, it's set with the newly created object. | |
1734 | * | |
1735 | * Return 0 on success or else a negative value. | |
1736 | */ | |
1737 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1738 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1739 | { | |
1740 | int ret = 0; | |
1741 | struct buffer_reg_pid *reg_pid; | |
1742 | ||
1743 | assert(ua_sess); | |
1744 | assert(app); | |
1745 | ||
1746 | rcu_read_lock(); | |
1747 | ||
1748 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1749 | if (!reg_pid) { | |
1750 | /* | |
1751 | * This is the create channel path meaning that if there is NO | |
1752 | * registry available, we have to create one for this session. | |
1753 | */ | |
1754 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1755 | if (ret < 0) { | |
1756 | goto error; | |
1757 | } | |
1758 | buffer_reg_pid_add(reg_pid); | |
1759 | } else { | |
1760 | goto end; | |
1761 | } | |
1762 | ||
1763 | /* Initialize registry. */ | |
1764 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1765 | app->bits_per_long, app->uint8_t_alignment, | |
1766 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1767 | app->uint64_t_alignment, app->long_alignment, |
1768 | app->byte_order, app->version.major, | |
1769 | app->version.minor); | |
7972aab2 DG |
1770 | if (ret < 0) { |
1771 | goto error; | |
1772 | } | |
1773 | ||
1774 | DBG3("UST app buffer registry per PID created successfully"); | |
1775 | ||
1776 | end: | |
1777 | if (regp) { | |
1778 | *regp = reg_pid; | |
1779 | } | |
1780 | error: | |
1781 | rcu_read_unlock(); | |
1782 | return ret; | |
1783 | } | |
1784 | ||
1785 | /* | |
1786 | * Setup buffer registry per UID for the given session and application. If none | |
1787 | * is found, a new one is created, added to the global registry and | |
1788 | * initialized. If regp is valid, it's set with the newly created object. | |
1789 | * | |
1790 | * Return 0 on success or else a negative value. | |
1791 | */ | |
1792 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1793 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1794 | { | |
1795 | int ret = 0; | |
1796 | struct buffer_reg_uid *reg_uid; | |
1797 | ||
1798 | assert(usess); | |
1799 | assert(app); | |
1800 | ||
1801 | rcu_read_lock(); | |
1802 | ||
1803 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1804 | if (!reg_uid) { | |
1805 | /* | |
1806 | * This is the create channel path meaning that if there is NO | |
1807 | * registry available, we have to create one for this session. | |
1808 | */ | |
1809 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1810 | LTTNG_DOMAIN_UST, ®_uid); | |
1811 | if (ret < 0) { | |
1812 | goto error; | |
1813 | } | |
1814 | buffer_reg_uid_add(reg_uid); | |
1815 | } else { | |
1816 | goto end; | |
1817 | } | |
1818 | ||
1819 | /* Initialize registry. */ | |
af6142cf | 1820 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1821 | app->bits_per_long, app->uint8_t_alignment, |
1822 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1823 | app->uint64_t_alignment, app->long_alignment, |
1824 | app->byte_order, app->version.major, | |
1825 | app->version.minor); | |
7972aab2 DG |
1826 | if (ret < 0) { |
1827 | goto error; | |
1828 | } | |
1829 | /* Add node to teardown list of the session. */ | |
1830 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1831 | ||
1832 | DBG3("UST app buffer registry per UID created successfully"); | |
1833 | ||
1834 | end: | |
1835 | if (regp) { | |
1836 | *regp = reg_uid; | |
1837 | } | |
1838 | error: | |
1839 | rcu_read_unlock(); | |
1840 | return ret; | |
1841 | } | |
1842 | ||
421cb601 | 1843 | /* |
3d8ca23b | 1844 | * Create a session on the tracer side for the given app. |
421cb601 | 1845 | * |
3d8ca23b DG |
1846 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1847 | * untouched. If the session was created, is_created is set to 1. On error, | |
1848 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1849 | * be NULL. | |
1850 | * | |
1851 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1852 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1853 | */ |
3d8ca23b DG |
1854 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1855 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1856 | int *is_created) | |
421cb601 | 1857 | { |
3d8ca23b | 1858 | int ret, created = 0; |
421cb601 DG |
1859 | struct ust_app_session *ua_sess; |
1860 | ||
3d8ca23b DG |
1861 | assert(usess); |
1862 | assert(app); | |
1863 | assert(ua_sess_ptr); | |
1864 | ||
840cb59c | 1865 | health_code_update(); |
86acf0da | 1866 | |
421cb601 DG |
1867 | ua_sess = lookup_session_by_app(usess, app); |
1868 | if (ua_sess == NULL) { | |
d9bf3ca4 | 1869 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1870 | app->pid, usess->id); |
d0b96690 | 1871 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1872 | if (ua_sess == NULL) { |
1873 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1874 | ret = -ENOMEM; |
1875 | goto error; | |
421cb601 | 1876 | } |
477d7741 | 1877 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1878 | created = 1; |
421cb601 DG |
1879 | } |
1880 | ||
7972aab2 DG |
1881 | switch (usess->buffer_type) { |
1882 | case LTTNG_BUFFER_PER_PID: | |
1883 | /* Init local registry. */ | |
1884 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1885 | if (ret < 0) { |
7972aab2 DG |
1886 | goto error; |
1887 | } | |
1888 | break; | |
1889 | case LTTNG_BUFFER_PER_UID: | |
1890 | /* Look for a global registry. If none exists, create one. */ | |
1891 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1892 | if (ret < 0) { | |
1893 | goto error; | |
1894 | } | |
1895 | break; | |
1896 | default: | |
1897 | assert(0); | |
1898 | ret = -EINVAL; | |
1899 | goto error; | |
1900 | } | |
1901 | ||
1902 | health_code_update(); | |
1903 | ||
1904 | if (ua_sess->handle == -1) { | |
1905 | ret = ustctl_create_session(app->sock); | |
1906 | if (ret < 0) { | |
1907 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1908 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1909 | app->pid, ret); |
1910 | } else { | |
1911 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
1912 | /* |
1913 | * This is normal behavior, an application can die during the | |
1914 | * creation process. Don't report an error so the execution can | |
1915 | * continue normally. This will get flagged ENOTCONN and the | |
1916 | * caller will handle it. | |
1917 | */ | |
1918 | ret = 0; | |
ffe60014 | 1919 | } |
d0b96690 | 1920 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1921 | if (ret != -ENOMEM) { |
1922 | /* | |
1923 | * Tracer is probably gone or got an internal error so let's | |
1924 | * behave like it will soon unregister or not usable. | |
1925 | */ | |
1926 | ret = -ENOTCONN; | |
1927 | } | |
1928 | goto error; | |
421cb601 DG |
1929 | } |
1930 | ||
7972aab2 DG |
1931 | ua_sess->handle = ret; |
1932 | ||
1933 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
1934 | lttng_ht_node_init_u64(&ua_sess->node, |
1935 | ua_sess->tracing_id); | |
1936 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1937 | |
1938 | DBG2("UST app session created successfully with handle %d", ret); | |
1939 | } | |
1940 | ||
1941 | *ua_sess_ptr = ua_sess; | |
1942 | if (is_created) { | |
1943 | *is_created = created; | |
1944 | } | |
1945 | ||
1946 | /* Everything went well. */ | |
1947 | ret = 0; | |
1948 | ||
1949 | error: | |
1950 | health_code_update(); | |
1951 | return ret; | |
1952 | } | |
1953 | ||
2b8d9b68 JG |
1954 | /* |
1955 | * Match function for a hash table lookup of ust_app_ctx. | |
1956 | * | |
1957 | * It matches an ust app context based on the context type and, in the case | |
1958 | * of perf counters, their name. | |
1959 | */ | |
1960 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
1961 | { | |
1962 | struct ust_app_ctx *ctx; | |
1963 | const struct lttng_ust_context *key; | |
1964 | ||
1965 | assert(node); | |
1966 | assert(_key); | |
1967 | ||
1968 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
1969 | key = _key; | |
1970 | ||
1971 | /* Context type */ | |
1972 | if (ctx->ctx.ctx != key->ctx) { | |
1973 | goto no_match; | |
1974 | } | |
1975 | ||
1976 | /* Check the name in the case of perf thread counters. */ | |
1977 | if (key->ctx == LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER) { | |
1978 | if (strncmp(key->u.perf_counter.name, | |
1979 | ctx->ctx.u.perf_counter.name, | |
1980 | sizeof(key->u.perf_counter.name))) { | |
1981 | goto no_match; | |
1982 | } | |
1983 | } | |
1984 | ||
1985 | /* Match. */ | |
1986 | return 1; | |
1987 | ||
1988 | no_match: | |
1989 | return 0; | |
1990 | } | |
1991 | ||
1992 | /* | |
1993 | * Lookup for an ust app context from an lttng_ust_context. | |
1994 | * | |
64a81a85 | 1995 | * Must be called while holding RCU read side lock. |
2b8d9b68 JG |
1996 | * Return an ust_app_ctx object or NULL on error. |
1997 | */ | |
1998 | static | |
1999 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
2000 | struct lttng_ust_context *uctx) | |
2001 | { | |
2002 | struct lttng_ht_iter iter; | |
2003 | struct lttng_ht_node_ulong *node; | |
2004 | struct ust_app_ctx *app_ctx = NULL; | |
2005 | ||
2006 | assert(uctx); | |
2007 | assert(ht); | |
2008 | ||
2009 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2010 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2011 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2012 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2013 | if (!node) { | |
2014 | goto end; | |
2015 | } | |
2016 | ||
2017 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2018 | ||
2019 | end: | |
2020 | return app_ctx; | |
2021 | } | |
2022 | ||
7972aab2 DG |
2023 | /* |
2024 | * Create a context for the channel on the tracer. | |
2025 | * | |
2026 | * Called with UST app session lock held and a RCU read side lock. | |
2027 | */ | |
2028 | static | |
2029 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
2030 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
2031 | struct ust_app *app) | |
2032 | { | |
2033 | int ret = 0; | |
7972aab2 DG |
2034 | struct ust_app_ctx *ua_ctx; |
2035 | ||
2036 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2037 | ||
2b8d9b68 JG |
2038 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2039 | if (ua_ctx) { | |
7972aab2 DG |
2040 | ret = -EEXIST; |
2041 | goto error; | |
2042 | } | |
2043 | ||
2044 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2045 | if (ua_ctx == NULL) { | |
2046 | /* malloc failed */ | |
2047 | ret = -1; | |
2048 | goto error; | |
2049 | } | |
2050 | ||
2051 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2052 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2053 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2054 | |
2055 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2056 | if (ret < 0) { | |
2057 | goto error; | |
2058 | } | |
2059 | ||
2060 | error: | |
2061 | return ret; | |
2062 | } | |
2063 | ||
2064 | /* | |
2065 | * Enable on the tracer side a ust app event for the session and channel. | |
2066 | * | |
2067 | * Called with UST app session lock held. | |
2068 | */ | |
2069 | static | |
2070 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2071 | struct ust_app_event *ua_event, struct ust_app *app) | |
2072 | { | |
2073 | int ret; | |
2074 | ||
2075 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2076 | if (ret < 0) { | |
2077 | goto error; | |
2078 | } | |
2079 | ||
2080 | ua_event->enabled = 1; | |
2081 | ||
2082 | error: | |
2083 | return ret; | |
2084 | } | |
2085 | ||
2086 | /* | |
2087 | * Disable on the tracer side a ust app event for the session and channel. | |
2088 | */ | |
2089 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2090 | struct ust_app_event *ua_event, struct ust_app *app) | |
2091 | { | |
2092 | int ret; | |
2093 | ||
2094 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2095 | if (ret < 0) { | |
2096 | goto error; | |
2097 | } | |
2098 | ||
2099 | ua_event->enabled = 0; | |
2100 | ||
2101 | error: | |
2102 | return ret; | |
2103 | } | |
2104 | ||
2105 | /* | |
2106 | * Lookup ust app channel for session and disable it on the tracer side. | |
2107 | */ | |
2108 | static | |
2109 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2110 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2111 | { | |
2112 | int ret; | |
2113 | ||
2114 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2115 | if (ret < 0) { | |
2116 | goto error; | |
2117 | } | |
2118 | ||
2119 | ua_chan->enabled = 0; | |
2120 | ||
2121 | error: | |
2122 | return ret; | |
2123 | } | |
2124 | ||
2125 | /* | |
2126 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2127 | * MUST be called with a RCU read side lock acquired. | |
2128 | */ | |
2129 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2130 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2131 | { | |
2132 | int ret = 0; | |
2133 | struct lttng_ht_iter iter; | |
2134 | struct lttng_ht_node_str *ua_chan_node; | |
2135 | struct ust_app_channel *ua_chan; | |
2136 | ||
2137 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2138 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2139 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2140 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2141 | uchan->name, ua_sess->tracing_id); |
2142 | goto error; | |
2143 | } | |
2144 | ||
2145 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2146 | ||
2147 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2148 | if (ret < 0) { | |
2149 | goto error; | |
2150 | } | |
2151 | ||
2152 | error: | |
2153 | return ret; | |
2154 | } | |
2155 | ||
2156 | /* | |
2157 | * Ask the consumer to create a channel and get it if successful. | |
2158 | * | |
2159 | * Return 0 on success or else a negative value. | |
2160 | */ | |
2161 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2162 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2163 | int bitness, struct ust_registry_session *registry) | |
2164 | { | |
2165 | int ret; | |
2166 | unsigned int nb_fd = 0; | |
2167 | struct consumer_socket *socket; | |
2168 | ||
2169 | assert(usess); | |
2170 | assert(ua_sess); | |
2171 | assert(ua_chan); | |
2172 | assert(registry); | |
2173 | ||
2174 | rcu_read_lock(); | |
2175 | health_code_update(); | |
2176 | ||
2177 | /* Get the right consumer socket for the application. */ | |
2178 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2179 | if (!socket) { | |
2180 | ret = -EINVAL; | |
2181 | goto error; | |
2182 | } | |
2183 | ||
2184 | health_code_update(); | |
2185 | ||
2186 | /* Need one fd for the channel. */ | |
2187 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2188 | if (ret < 0) { | |
2189 | ERR("Exhausted number of available FD upon create channel"); | |
2190 | goto error; | |
2191 | } | |
2192 | ||
2193 | /* | |
2194 | * Ask consumer to create channel. The consumer will return the number of | |
2195 | * stream we have to expect. | |
2196 | */ | |
2197 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2198 | registry); | |
2199 | if (ret < 0) { | |
2200 | goto error_ask; | |
2201 | } | |
2202 | ||
2203 | /* | |
2204 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2205 | * stream (2 being the default value here). | |
2206 | */ | |
2207 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2208 | ||
2209 | /* Reserve the amount of file descriptor we need. */ | |
2210 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2211 | if (ret < 0) { | |
2212 | ERR("Exhausted number of available FD upon create channel"); | |
2213 | goto error_fd_get_stream; | |
2214 | } | |
2215 | ||
2216 | health_code_update(); | |
2217 | ||
2218 | /* | |
2219 | * Now get the channel from the consumer. This call wil populate the stream | |
2220 | * list of that channel and set the ust objects. | |
2221 | */ | |
d9078d0c DG |
2222 | if (usess->consumer->enabled) { |
2223 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2224 | if (ret < 0) { | |
2225 | goto error_destroy; | |
2226 | } | |
7972aab2 DG |
2227 | } |
2228 | ||
2229 | rcu_read_unlock(); | |
2230 | return 0; | |
2231 | ||
2232 | error_destroy: | |
2233 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2234 | error_fd_get_stream: | |
2235 | /* | |
2236 | * Initiate a destroy channel on the consumer since we had an error | |
2237 | * handling it on our side. The return value is of no importance since we | |
2238 | * already have a ret value set by the previous error that we need to | |
2239 | * return. | |
2240 | */ | |
2241 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2242 | error_ask: | |
2243 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2244 | error: | |
2245 | health_code_update(); | |
2246 | rcu_read_unlock(); | |
2247 | return ret; | |
2248 | } | |
2249 | ||
2250 | /* | |
2251 | * Duplicate the ust data object of the ust app stream and save it in the | |
2252 | * buffer registry stream. | |
2253 | * | |
2254 | * Return 0 on success or else a negative value. | |
2255 | */ | |
2256 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2257 | struct ust_app_stream *stream) | |
2258 | { | |
2259 | int ret; | |
2260 | ||
2261 | assert(reg_stream); | |
2262 | assert(stream); | |
2263 | ||
2264 | /* Reserve the amount of file descriptor we need. */ | |
2265 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2266 | if (ret < 0) { | |
2267 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2268 | goto error; | |
2269 | } | |
2270 | ||
2271 | /* Duplicate object for stream once the original is in the registry. */ | |
2272 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2273 | reg_stream->obj.ust); | |
2274 | if (ret < 0) { | |
2275 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2276 | reg_stream->obj.ust, stream->obj, ret); | |
2277 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2278 | goto error; | |
2279 | } | |
2280 | stream->handle = stream->obj->handle; | |
2281 | ||
2282 | error: | |
2283 | return ret; | |
2284 | } | |
2285 | ||
2286 | /* | |
2287 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2288 | * buffer registry channel. | |
2289 | * | |
2290 | * Return 0 on success or else a negative value. | |
2291 | */ | |
2292 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2293 | struct ust_app_channel *ua_chan) | |
2294 | { | |
2295 | int ret; | |
2296 | ||
2297 | assert(reg_chan); | |
2298 | assert(ua_chan); | |
2299 | ||
2300 | /* Need two fds for the channel. */ | |
2301 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2302 | if (ret < 0) { | |
2303 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2304 | goto error_fd_get; | |
2305 | } | |
2306 | ||
2307 | /* Duplicate object for stream once the original is in the registry. */ | |
2308 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2309 | if (ret < 0) { | |
2310 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2311 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2312 | goto error; | |
2313 | } | |
2314 | ua_chan->handle = ua_chan->obj->handle; | |
2315 | ||
2316 | return 0; | |
2317 | ||
2318 | error: | |
2319 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2320 | error_fd_get: | |
2321 | return ret; | |
2322 | } | |
2323 | ||
2324 | /* | |
2325 | * For a given channel buffer registry, setup all streams of the given ust | |
2326 | * application channel. | |
2327 | * | |
2328 | * Return 0 on success or else a negative value. | |
2329 | */ | |
2330 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2331 | struct ust_app_channel *ua_chan) | |
2332 | { | |
2333 | int ret = 0; | |
2334 | struct ust_app_stream *stream, *stmp; | |
2335 | ||
2336 | assert(reg_chan); | |
2337 | assert(ua_chan); | |
2338 | ||
2339 | DBG2("UST app setup buffer registry stream"); | |
2340 | ||
2341 | /* Send all streams to application. */ | |
2342 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2343 | struct buffer_reg_stream *reg_stream; | |
2344 | ||
2345 | ret = buffer_reg_stream_create(®_stream); | |
2346 | if (ret < 0) { | |
2347 | goto error; | |
2348 | } | |
2349 | ||
2350 | /* | |
2351 | * Keep original pointer and nullify it in the stream so the delete | |
2352 | * stream call does not release the object. | |
2353 | */ | |
2354 | reg_stream->obj.ust = stream->obj; | |
2355 | stream->obj = NULL; | |
2356 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2357 | |
7972aab2 DG |
2358 | /* We don't need the streams anymore. */ |
2359 | cds_list_del(&stream->list); | |
2360 | delete_ust_app_stream(-1, stream); | |
2361 | } | |
421cb601 | 2362 | |
7972aab2 DG |
2363 | error: |
2364 | return ret; | |
2365 | } | |
2366 | ||
2367 | /* | |
2368 | * Create a buffer registry channel for the given session registry and | |
2369 | * application channel object. If regp pointer is valid, it's set with the | |
2370 | * created object. Important, the created object is NOT added to the session | |
2371 | * registry hash table. | |
2372 | * | |
2373 | * Return 0 on success else a negative value. | |
2374 | */ | |
2375 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2376 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2377 | { | |
2378 | int ret; | |
2379 | struct buffer_reg_channel *reg_chan = NULL; | |
2380 | ||
2381 | assert(reg_sess); | |
2382 | assert(ua_chan); | |
2383 | ||
2384 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2385 | ||
2386 | /* Create buffer registry channel. */ | |
2387 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2388 | if (ret < 0) { | |
2389 | goto error_create; | |
421cb601 | 2390 | } |
7972aab2 DG |
2391 | assert(reg_chan); |
2392 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2393 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
421cb601 | 2394 | |
7972aab2 DG |
2395 | /* Create and add a channel registry to session. */ |
2396 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2397 | ua_chan->tracing_channel_id); | |
2398 | if (ret < 0) { | |
2399 | goto error; | |
d88aee68 | 2400 | } |
7972aab2 | 2401 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2402 | |
7972aab2 DG |
2403 | if (regp) { |
2404 | *regp = reg_chan; | |
3d8ca23b | 2405 | } |
d88aee68 | 2406 | |
7972aab2 | 2407 | return 0; |
3d8ca23b DG |
2408 | |
2409 | error: | |
7972aab2 DG |
2410 | /* Safe because the registry channel object was not added to any HT. */ |
2411 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2412 | error_create: | |
3d8ca23b | 2413 | return ret; |
421cb601 DG |
2414 | } |
2415 | ||
55cc08a6 | 2416 | /* |
7972aab2 DG |
2417 | * Setup buffer registry channel for the given session registry and application |
2418 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2419 | * |
7972aab2 | 2420 | * Return 0 on success else a negative value. |
55cc08a6 | 2421 | */ |
7972aab2 DG |
2422 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2423 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2424 | { |
7972aab2 | 2425 | int ret; |
55cc08a6 | 2426 | |
7972aab2 DG |
2427 | assert(reg_sess); |
2428 | assert(reg_chan); | |
2429 | assert(ua_chan); | |
2430 | assert(ua_chan->obj); | |
55cc08a6 | 2431 | |
7972aab2 | 2432 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2433 | |
7972aab2 DG |
2434 | /* Setup all streams for the registry. */ |
2435 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2436 | if (ret < 0) { | |
55cc08a6 DG |
2437 | goto error; |
2438 | } | |
2439 | ||
7972aab2 DG |
2440 | reg_chan->obj.ust = ua_chan->obj; |
2441 | ua_chan->obj = NULL; | |
55cc08a6 | 2442 | |
7972aab2 | 2443 | return 0; |
55cc08a6 DG |
2444 | |
2445 | error: | |
7972aab2 DG |
2446 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2447 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2448 | return ret; |
2449 | } | |
2450 | ||
edb67388 | 2451 | /* |
7972aab2 | 2452 | * Send buffer registry channel to the application. |
d0b96690 | 2453 | * |
7972aab2 | 2454 | * Return 0 on success else a negative value. |
edb67388 | 2455 | */ |
7972aab2 DG |
2456 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2457 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2458 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2459 | { |
2460 | int ret; | |
7972aab2 | 2461 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2462 | |
7972aab2 DG |
2463 | assert(reg_chan); |
2464 | assert(app); | |
2465 | assert(ua_sess); | |
2466 | assert(ua_chan); | |
2467 | ||
2468 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2469 | ||
2470 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2471 | if (ret < 0) { |
2472 | goto error; | |
2473 | } | |
2474 | ||
7972aab2 DG |
2475 | /* Send channel to the application. */ |
2476 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2477 | if (ret < 0) { | |
2478 | goto error; | |
2479 | } | |
2480 | ||
2481 | health_code_update(); | |
2482 | ||
2483 | /* Send all streams to application. */ | |
2484 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2485 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2486 | struct ust_app_stream stream; | |
2487 | ||
2488 | ret = duplicate_stream_object(reg_stream, &stream); | |
2489 | if (ret < 0) { | |
2490 | goto error_stream_unlock; | |
2491 | } | |
2492 | ||
2493 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2494 | if (ret < 0) { | |
8c067051 | 2495 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2496 | goto error_stream_unlock; |
2497 | } | |
edb67388 | 2498 | |
7972aab2 DG |
2499 | /* |
2500 | * The return value is not important here. This function will output an | |
2501 | * error if needed. | |
2502 | */ | |
2503 | (void) release_ust_app_stream(-1, &stream); | |
2504 | } | |
2505 | ua_chan->is_sent = 1; | |
2506 | ||
2507 | error_stream_unlock: | |
2508 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2509 | error: |
2510 | return ret; | |
2511 | } | |
2512 | ||
9730260e | 2513 | /* |
7972aab2 DG |
2514 | * Create and send to the application the created buffers with per UID buffers. |
2515 | * | |
2516 | * Return 0 on success else a negative value. | |
9730260e | 2517 | */ |
7972aab2 DG |
2518 | static int create_channel_per_uid(struct ust_app *app, |
2519 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2520 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2521 | { |
2522 | int ret; | |
7972aab2 DG |
2523 | struct buffer_reg_uid *reg_uid; |
2524 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2525 | |
7972aab2 DG |
2526 | assert(app); |
2527 | assert(usess); | |
2528 | assert(ua_sess); | |
2529 | assert(ua_chan); | |
2530 | ||
2531 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2532 | ||
2533 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2534 | /* | |
2535 | * The session creation handles the creation of this global registry | |
2536 | * object. If none can be find, there is a code flow problem or a | |
2537 | * teardown race. | |
2538 | */ | |
2539 | assert(reg_uid); | |
2540 | ||
2541 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2542 | reg_uid); | |
2543 | if (!reg_chan) { | |
2544 | /* Create the buffer registry channel object. */ | |
2545 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2546 | if (ret < 0) { | |
2547 | goto error; | |
2548 | } | |
2549 | assert(reg_chan); | |
2550 | ||
2551 | /* | |
2552 | * Create the buffers on the consumer side. This call populates the | |
2553 | * ust app channel object with all streams and data object. | |
2554 | */ | |
2555 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2556 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2557 | if (ret < 0) { | |
07d2ae95 DG |
2558 | /* |
2559 | * Let's remove the previously created buffer registry channel so | |
2560 | * it's not visible anymore in the session registry. | |
2561 | */ | |
2562 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2563 | ua_chan->tracing_channel_id); | |
2564 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2565 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2566 | goto error; |
2567 | } | |
2568 | ||
2569 | /* | |
2570 | * Setup the streams and add it to the session registry. | |
2571 | */ | |
2572 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2573 | if (ret < 0) { | |
2574 | goto error; | |
2575 | } | |
2576 | ||
2577 | } | |
2578 | ||
2579 | /* Send buffers to the application. */ | |
2580 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2581 | if (ret < 0) { |
2582 | goto error; | |
2583 | } | |
2584 | ||
9730260e DG |
2585 | error: |
2586 | return ret; | |
2587 | } | |
2588 | ||
78f0bacd | 2589 | /* |
7972aab2 DG |
2590 | * Create and send to the application the created buffers with per PID buffers. |
2591 | * | |
2592 | * Return 0 on success else a negative value. | |
78f0bacd | 2593 | */ |
7972aab2 DG |
2594 | static int create_channel_per_pid(struct ust_app *app, |
2595 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2596 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2597 | { |
8535a6d9 | 2598 | int ret; |
7972aab2 | 2599 | struct ust_registry_session *registry; |
78f0bacd | 2600 | |
7972aab2 DG |
2601 | assert(app); |
2602 | assert(usess); | |
2603 | assert(ua_sess); | |
2604 | assert(ua_chan); | |
2605 | ||
2606 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2607 | ||
2608 | rcu_read_lock(); | |
2609 | ||
2610 | registry = get_session_registry(ua_sess); | |
2611 | assert(registry); | |
2612 | ||
2613 | /* Create and add a new channel registry to session. */ | |
2614 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2615 | if (ret < 0) { |
2616 | goto error; | |
2617 | } | |
2618 | ||
7972aab2 DG |
2619 | /* Create and get channel on the consumer side. */ |
2620 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2621 | app->bits_per_long, registry); | |
2622 | if (ret < 0) { | |
2623 | goto error; | |
2624 | } | |
2625 | ||
2626 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2627 | if (ret < 0) { | |
2628 | goto error; | |
2629 | } | |
8535a6d9 | 2630 | |
78f0bacd | 2631 | error: |
7972aab2 | 2632 | rcu_read_unlock(); |
78f0bacd DG |
2633 | return ret; |
2634 | } | |
2635 | ||
2636 | /* | |
7972aab2 DG |
2637 | * From an already allocated ust app channel, create the channel buffers if |
2638 | * need and send it to the application. This MUST be called with a RCU read | |
2639 | * side lock acquired. | |
2640 | * | |
2641 | * Return 0 on success or else a negative value. | |
78f0bacd | 2642 | */ |
7972aab2 DG |
2643 | static int do_create_channel(struct ust_app *app, |
2644 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2645 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2646 | { |
7972aab2 | 2647 | int ret; |
78f0bacd | 2648 | |
7972aab2 DG |
2649 | assert(app); |
2650 | assert(usess); | |
2651 | assert(ua_sess); | |
2652 | assert(ua_chan); | |
2653 | ||
2654 | /* Handle buffer type before sending the channel to the application. */ | |
2655 | switch (usess->buffer_type) { | |
2656 | case LTTNG_BUFFER_PER_UID: | |
2657 | { | |
2658 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2659 | if (ret < 0) { | |
2660 | goto error; | |
2661 | } | |
2662 | break; | |
2663 | } | |
2664 | case LTTNG_BUFFER_PER_PID: | |
2665 | { | |
2666 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2667 | if (ret < 0) { | |
2668 | goto error; | |
2669 | } | |
2670 | break; | |
2671 | } | |
2672 | default: | |
2673 | assert(0); | |
2674 | ret = -EINVAL; | |
78f0bacd DG |
2675 | goto error; |
2676 | } | |
2677 | ||
7972aab2 DG |
2678 | /* Initialize ust objd object using the received handle and add it. */ |
2679 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2680 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2681 | |
7972aab2 DG |
2682 | /* If channel is not enabled, disable it on the tracer */ |
2683 | if (!ua_chan->enabled) { | |
2684 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2685 | if (ret < 0) { | |
2686 | goto error; | |
2687 | } | |
78f0bacd DG |
2688 | } |
2689 | ||
2690 | error: | |
2691 | return ret; | |
2692 | } | |
2693 | ||
284d8f55 | 2694 | /* |
4d710ac2 DG |
2695 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2696 | * newly created channel if not NULL. | |
d0b96690 | 2697 | * |
36b588ed | 2698 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2699 | * |
2700 | * Return 0 on success or else a negative value. | |
284d8f55 | 2701 | */ |
4d710ac2 DG |
2702 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2703 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2704 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2705 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2706 | { |
2707 | int ret = 0; | |
bec39940 DG |
2708 | struct lttng_ht_iter iter; |
2709 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2710 | struct ust_app_channel *ua_chan; |
2711 | ||
2712 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2713 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2714 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2715 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2716 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2717 | goto end; |
5b4a0ec0 DG |
2718 | } |
2719 | ||
d0b96690 | 2720 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2721 | if (ua_chan == NULL) { |
2722 | /* Only malloc can fail here */ | |
4d710ac2 | 2723 | ret = -ENOMEM; |
094d1690 | 2724 | goto error_alloc; |
fc34caaa DG |
2725 | } |
2726 | shadow_copy_channel(ua_chan, uchan); | |
2727 | ||
ffe60014 DG |
2728 | /* Set channel type. */ |
2729 | ua_chan->attr.type = type; | |
2730 | ||
7972aab2 | 2731 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2732 | if (ret < 0) { |
2733 | goto error; | |
2734 | } | |
2735 | ||
fc34caaa | 2736 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2737 | app->pid); |
fc34caaa | 2738 | |
d0b96690 DG |
2739 | /* Only add the channel if successful on the tracer side. */ |
2740 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2741 | ||
fc34caaa | 2742 | end: |
4d710ac2 DG |
2743 | if (ua_chanp) { |
2744 | *ua_chanp = ua_chan; | |
2745 | } | |
2746 | ||
2747 | /* Everything went well. */ | |
2748 | return 0; | |
5b4a0ec0 DG |
2749 | |
2750 | error: | |
d0b96690 | 2751 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2752 | error_alloc: |
4d710ac2 | 2753 | return ret; |
5b4a0ec0 DG |
2754 | } |
2755 | ||
2756 | /* | |
2757 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2758 | * |
2759 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2760 | */ |
edb67388 DG |
2761 | static |
2762 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2763 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2764 | struct ust_app *app) | |
284d8f55 | 2765 | { |
edb67388 | 2766 | int ret = 0; |
5b4a0ec0 | 2767 | struct ust_app_event *ua_event; |
284d8f55 | 2768 | |
5b4a0ec0 | 2769 | /* Get event node */ |
18eace3b | 2770 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 2771 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 2772 | if (ua_event != NULL) { |
fc34caaa | 2773 | ret = -EEXIST; |
edb67388 DG |
2774 | goto end; |
2775 | } | |
5b4a0ec0 | 2776 | |
edb67388 DG |
2777 | /* Does not exist so create one */ |
2778 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2779 | if (ua_event == NULL) { | |
2780 | /* Only malloc can failed so something is really wrong */ | |
2781 | ret = -ENOMEM; | |
fc34caaa | 2782 | goto end; |
5b4a0ec0 | 2783 | } |
edb67388 | 2784 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2785 | |
edb67388 | 2786 | /* Create it on the tracer side */ |
5b4a0ec0 | 2787 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2788 | if (ret < 0) { |
fc34caaa | 2789 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2790 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2791 | goto error; |
2792 | } | |
2793 | ||
d0b96690 | 2794 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2795 | |
fc34caaa | 2796 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2797 | app->pid); |
7f79d3a1 | 2798 | |
edb67388 | 2799 | end: |
fc34caaa DG |
2800 | return ret; |
2801 | ||
5b4a0ec0 | 2802 | error: |
fc34caaa DG |
2803 | /* Valid. Calling here is already in a read side lock */ |
2804 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2805 | return ret; |
5b4a0ec0 DG |
2806 | } |
2807 | ||
2808 | /* | |
2809 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2810 | * |
7972aab2 | 2811 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2812 | */ |
2813 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 2814 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
2815 | { |
2816 | int ret = 0; | |
ffe60014 | 2817 | struct ust_app_channel *metadata; |
d88aee68 | 2818 | struct consumer_socket *socket; |
7972aab2 | 2819 | struct ust_registry_session *registry; |
5b4a0ec0 | 2820 | |
ffe60014 DG |
2821 | assert(ua_sess); |
2822 | assert(app); | |
d88aee68 | 2823 | assert(consumer); |
5b4a0ec0 | 2824 | |
7972aab2 DG |
2825 | registry = get_session_registry(ua_sess); |
2826 | assert(registry); | |
2827 | ||
1b532a60 DG |
2828 | /* Metadata already exists for this registry or it was closed previously */ |
2829 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2830 | ret = 0; |
2831 | goto error; | |
5b4a0ec0 DG |
2832 | } |
2833 | ||
ffe60014 | 2834 | /* Allocate UST metadata */ |
d0b96690 | 2835 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2836 | if (!metadata) { |
2837 | /* malloc() failed */ | |
2838 | ret = -ENOMEM; | |
2839 | goto error; | |
2840 | } | |
5b4a0ec0 | 2841 | |
ad7a9107 | 2842 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 2843 | |
7972aab2 DG |
2844 | /* Need one fd for the channel. */ |
2845 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2846 | if (ret < 0) { | |
2847 | ERR("Exhausted number of available FD upon create metadata"); | |
2848 | goto error; | |
2849 | } | |
2850 | ||
4dc3dfc5 DG |
2851 | /* Get the right consumer socket for the application. */ |
2852 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2853 | if (!socket) { | |
2854 | ret = -EINVAL; | |
2855 | goto error_consumer; | |
2856 | } | |
2857 | ||
331744e3 JD |
2858 | /* |
2859 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2860 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2861 | * consumer requesting the metadata and the ask_channel call on our side | |
2862 | * did not returned yet. | |
2863 | */ | |
2864 | registry->metadata_key = metadata->key; | |
2865 | ||
d88aee68 DG |
2866 | /* |
2867 | * Ask the metadata channel creation to the consumer. The metadata object | |
2868 | * will be created by the consumer and kept their. However, the stream is | |
2869 | * never added or monitored until we do a first push metadata to the | |
2870 | * consumer. | |
2871 | */ | |
7972aab2 DG |
2872 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2873 | registry); | |
d88aee68 | 2874 | if (ret < 0) { |
f2a444f1 DG |
2875 | /* Nullify the metadata key so we don't try to close it later on. */ |
2876 | registry->metadata_key = 0; | |
d88aee68 DG |
2877 | goto error_consumer; |
2878 | } | |
2879 | ||
2880 | /* | |
2881 | * The setup command will make the metadata stream be sent to the relayd, | |
2882 | * if applicable, and the thread managing the metadatas. This is important | |
2883 | * because after this point, if an error occurs, the only way the stream | |
2884 | * can be deleted is to be monitored in the consumer. | |
2885 | */ | |
7972aab2 | 2886 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2887 | if (ret < 0) { |
f2a444f1 DG |
2888 | /* Nullify the metadata key so we don't try to close it later on. */ |
2889 | registry->metadata_key = 0; | |
d88aee68 | 2890 | goto error_consumer; |
5b4a0ec0 DG |
2891 | } |
2892 | ||
7972aab2 DG |
2893 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2894 | metadata->key, app->pid); | |
5b4a0ec0 | 2895 | |
d88aee68 | 2896 | error_consumer: |
b80f0b6c | 2897 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2898 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2899 | error: |
ffe60014 | 2900 | return ret; |
5b4a0ec0 DG |
2901 | } |
2902 | ||
5b4a0ec0 | 2903 | /* |
d88aee68 DG |
2904 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2905 | * acquired before calling this function. | |
5b4a0ec0 DG |
2906 | */ |
2907 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2908 | { | |
d88aee68 | 2909 | struct ust_app *app = NULL; |
bec39940 DG |
2910 | struct lttng_ht_node_ulong *node; |
2911 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2912 | |
bec39940 DG |
2913 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2914 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2915 | if (node == NULL) { |
2916 | DBG2("UST app no found with pid %d", pid); | |
2917 | goto error; | |
2918 | } | |
5b4a0ec0 DG |
2919 | |
2920 | DBG2("Found UST app by pid %d", pid); | |
2921 | ||
d88aee68 | 2922 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2923 | |
2924 | error: | |
d88aee68 | 2925 | return app; |
5b4a0ec0 DG |
2926 | } |
2927 | ||
d88aee68 DG |
2928 | /* |
2929 | * Allocate and init an UST app object using the registration information and | |
2930 | * the command socket. This is called when the command socket connects to the | |
2931 | * session daemon. | |
2932 | * | |
2933 | * The object is returned on success or else NULL. | |
2934 | */ | |
d0b96690 | 2935 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2936 | { |
d0b96690 DG |
2937 | struct ust_app *lta = NULL; |
2938 | ||
2939 | assert(msg); | |
2940 | assert(sock >= 0); | |
2941 | ||
2942 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2943 | |
173af62f DG |
2944 | if ((msg->bits_per_long == 64 && |
2945 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2946 | || (msg->bits_per_long == 32 && | |
2947 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2948 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2949 | "%d-bit long, but no consumerd for this size is available.\n", |
2950 | msg->name, msg->pid, msg->bits_per_long); | |
2951 | goto error; | |
3f2c5fcc | 2952 | } |
d0b96690 | 2953 | |
5b4a0ec0 DG |
2954 | lta = zmalloc(sizeof(struct ust_app)); |
2955 | if (lta == NULL) { | |
2956 | PERROR("malloc"); | |
d0b96690 | 2957 | goto error; |
5b4a0ec0 DG |
2958 | } |
2959 | ||
2960 | lta->ppid = msg->ppid; | |
2961 | lta->uid = msg->uid; | |
2962 | lta->gid = msg->gid; | |
d0b96690 | 2963 | |
7753dea8 | 2964 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2965 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2966 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2967 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2968 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2969 | lta->long_alignment = msg->long_alignment; | |
2970 | lta->byte_order = msg->byte_order; | |
2971 | ||
5b4a0ec0 DG |
2972 | lta->v_major = msg->major; |
2973 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 2974 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
2975 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2976 | lta->notify_sock = -1; | |
d88aee68 DG |
2977 | |
2978 | /* Copy name and make sure it's NULL terminated. */ | |
2979 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2980 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2981 | ||
2982 | /* | |
2983 | * Before this can be called, when receiving the registration information, | |
2984 | * the application compatibility is checked. So, at this point, the | |
2985 | * application can work with this session daemon. | |
2986 | */ | |
d0b96690 | 2987 | lta->compatible = 1; |
5b4a0ec0 | 2988 | |
852d0037 | 2989 | lta->pid = msg->pid; |
d0b96690 | 2990 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2991 | lta->sock = sock; |
d0b96690 | 2992 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2993 | |
d42f20df DG |
2994 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2995 | ||
d0b96690 DG |
2996 | error: |
2997 | return lta; | |
2998 | } | |
2999 | ||
d88aee68 DG |
3000 | /* |
3001 | * For a given application object, add it to every hash table. | |
3002 | */ | |
d0b96690 DG |
3003 | void ust_app_add(struct ust_app *app) |
3004 | { | |
3005 | assert(app); | |
3006 | assert(app->notify_sock >= 0); | |
3007 | ||
5b4a0ec0 | 3008 | rcu_read_lock(); |
852d0037 DG |
3009 | |
3010 | /* | |
3011 | * On a re-registration, we want to kick out the previous registration of | |
3012 | * that pid | |
3013 | */ | |
d0b96690 | 3014 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3015 | |
3016 | /* | |
3017 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3018 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3019 | * already in the table. | |
3020 | */ | |
d0b96690 | 3021 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3022 | |
d0b96690 DG |
3023 | /* Add application to the notify socket hash table. */ |
3024 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3025 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3026 | |
d0b96690 | 3027 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3028 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3029 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3030 | app->v_minor); | |
5b4a0ec0 | 3031 | |
d0b96690 DG |
3032 | rcu_read_unlock(); |
3033 | } | |
3034 | ||
d88aee68 DG |
3035 | /* |
3036 | * Set the application version into the object. | |
3037 | * | |
3038 | * Return 0 on success else a negative value either an errno code or a | |
3039 | * LTTng-UST error code. | |
3040 | */ | |
d0b96690 DG |
3041 | int ust_app_version(struct ust_app *app) |
3042 | { | |
d88aee68 DG |
3043 | int ret; |
3044 | ||
d0b96690 | 3045 | assert(app); |
d88aee68 DG |
3046 | |
3047 | ret = ustctl_tracer_version(app->sock, &app->version); | |
3048 | if (ret < 0) { | |
3049 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3050 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3051 | } else { |
5368d366 | 3052 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3053 | } |
3054 | } | |
3055 | ||
3056 | return ret; | |
5b4a0ec0 DG |
3057 | } |
3058 | ||
3059 | /* | |
3060 | * Unregister app by removing it from the global traceable app list and freeing | |
3061 | * the data struct. | |
3062 | * | |
3063 | * The socket is already closed at this point so no close to sock. | |
3064 | */ | |
3065 | void ust_app_unregister(int sock) | |
3066 | { | |
3067 | struct ust_app *lta; | |
bec39940 | 3068 | struct lttng_ht_node_ulong *node; |
774a7dbd | 3069 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3070 | struct lttng_ht_iter iter; |
d42f20df | 3071 | struct ust_app_session *ua_sess; |
525b0740 | 3072 | int ret; |
5b4a0ec0 DG |
3073 | |
3074 | rcu_read_lock(); | |
886459c6 | 3075 | |
5b4a0ec0 | 3076 | /* Get the node reference for a call_rcu */ |
774a7dbd MD |
3077 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3078 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3079 | assert(node); |
284d8f55 | 3080 | |
852d0037 | 3081 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3082 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3083 | ||
d88aee68 | 3084 | /* |
774a7dbd MD |
3085 | * Perform "push metadata" and flush all application streams |
3086 | * before removing app from hash tables, ensuring proper | |
3087 | * behavior of data_pending check. | |
3088 | * Remove sessions so they are not visible during deletion. | |
d88aee68 | 3089 | */ |
d42f20df DG |
3090 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3091 | node.node) { | |
7972aab2 DG |
3092 | struct ust_registry_session *registry; |
3093 | ||
d42f20df DG |
3094 | ret = lttng_ht_del(lta->sessions, &iter); |
3095 | if (ret) { | |
3096 | /* The session was already removed so scheduled for teardown. */ | |
3097 | continue; | |
3098 | } | |
3099 | ||
774a7dbd MD |
3100 | (void) ust_app_flush_app_session(lta, ua_sess); |
3101 | ||
d42f20df DG |
3102 | /* |
3103 | * Add session to list for teardown. This is safe since at this point we | |
3104 | * are the only one using this list. | |
3105 | */ | |
d88aee68 DG |
3106 | pthread_mutex_lock(&ua_sess->lock); |
3107 | ||
3108 | /* | |
3109 | * Normally, this is done in the delete session process which is | |
3110 | * executed in the call rcu below. However, upon registration we can't | |
3111 | * afford to wait for the grace period before pushing data or else the | |
3112 | * data pending feature can race between the unregistration and stop | |
3113 | * command where the data pending command is sent *before* the grace | |
3114 | * period ended. | |
3115 | * | |
3116 | * The close metadata below nullifies the metadata pointer in the | |
3117 | * session so the delete session will NOT push/close a second time. | |
3118 | */ | |
7972aab2 | 3119 | registry = get_session_registry(ua_sess); |
1b532a60 | 3120 | if (registry && !registry->metadata_closed) { |
7972aab2 DG |
3121 | /* Push metadata for application before freeing the application. */ |
3122 | (void) push_metadata(registry, ua_sess->consumer); | |
3123 | ||
3124 | /* | |
3125 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3126 | * metadata only on destroy trace session in this case. Also, the |
3127 | * previous push metadata could have flag the metadata registry to | |
3128 | * close so don't send a close command if closed. | |
7972aab2 | 3129 | */ |
1b532a60 DG |
3130 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
3131 | !registry->metadata_closed) { | |
7972aab2 DG |
3132 | /* And ask to close it for this session registry. */ |
3133 | (void) close_metadata(registry, ua_sess->consumer); | |
3134 | } | |
3135 | } | |
d42f20df | 3136 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
774a7dbd | 3137 | |
d88aee68 | 3138 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3139 | } |
3140 | ||
774a7dbd MD |
3141 | /* Remove application from PID hash table */ |
3142 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3143 | assert(!ret); | |
3144 | ||
3145 | /* | |
3146 | * Remove application from notify hash table. The thread handling the | |
3147 | * notify socket could have deleted the node so ignore on error because | |
3148 | * either way it's valid. The close of that socket is handled by the other | |
3149 | * thread. | |
3150 | */ | |
3151 | iter.iter.node = <a->notify_sock_n.node; | |
3152 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3153 | ||
3154 | /* | |
3155 | * Ignore return value since the node might have been removed before by an | |
3156 | * add replace during app registration because the PID can be reassigned by | |
3157 | * the OS. | |
3158 | */ | |
3159 | iter.iter.node = <a->pid_n.node; | |
3160 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3161 | if (ret) { | |
3162 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3163 | lta->pid); | |
3164 | } | |
3165 | ||
852d0037 DG |
3166 | /* Free memory */ |
3167 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3168 | ||
5b4a0ec0 DG |
3169 | rcu_read_unlock(); |
3170 | return; | |
284d8f55 DG |
3171 | } |
3172 | ||
5b4a0ec0 DG |
3173 | /* |
3174 | * Fill events array with all events name of all registered apps. | |
3175 | */ | |
3176 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3177 | { |
5b4a0ec0 DG |
3178 | int ret, handle; |
3179 | size_t nbmem, count = 0; | |
bec39940 | 3180 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3181 | struct ust_app *app; |
c617c0c6 | 3182 | struct lttng_event *tmp_event; |
421cb601 | 3183 | |
5b4a0ec0 | 3184 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3185 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3186 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3187 | PERROR("zmalloc ust app events"); |
3188 | ret = -ENOMEM; | |
421cb601 DG |
3189 | goto error; |
3190 | } | |
3191 | ||
5b4a0ec0 | 3192 | rcu_read_lock(); |
421cb601 | 3193 | |
852d0037 | 3194 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3195 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3196 | |
840cb59c | 3197 | health_code_update(); |
86acf0da | 3198 | |
e0c7ec2b DG |
3199 | if (!app->compatible) { |
3200 | /* | |
3201 | * TODO: In time, we should notice the caller of this error by | |
3202 | * telling him that this is a version error. | |
3203 | */ | |
3204 | continue; | |
3205 | } | |
852d0037 | 3206 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3207 | if (handle < 0) { |
ffe60014 DG |
3208 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3209 | ERR("UST app list events getting handle failed for app pid %d", | |
3210 | app->pid); | |
3211 | } | |
5b4a0ec0 DG |
3212 | continue; |
3213 | } | |
421cb601 | 3214 | |
852d0037 | 3215 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3216 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3217 | /* Handle ustctl error. */ |
3218 | if (ret < 0) { | |
a2ba1ab0 | 3219 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3220 | ERR("UST app tp list get failed for app %d with ret %d", |
3221 | app->sock, ret); | |
3222 | } else { | |
3223 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3224 | /* |
3225 | * This is normal behavior, an application can die during the | |
3226 | * creation process. Don't report an error so the execution can | |
3227 | * continue normally. Continue normal execution. | |
3228 | */ | |
3229 | break; | |
ffe60014 | 3230 | } |
98f595d4 | 3231 | free(tmp_event); |
ffe60014 DG |
3232 | goto rcu_error; |
3233 | } | |
3234 | ||
840cb59c | 3235 | health_code_update(); |
815564d8 | 3236 | if (count >= nbmem) { |
d7b3776f | 3237 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3238 | struct lttng_event *new_tmp_event; |
3239 | size_t new_nbmem; | |
3240 | ||
3241 | new_nbmem = nbmem << 1; | |
3242 | DBG2("Reallocating event list from %zu to %zu entries", | |
3243 | nbmem, new_nbmem); | |
3244 | new_tmp_event = realloc(tmp_event, | |
3245 | new_nbmem * sizeof(struct lttng_event)); | |
3246 | if (new_tmp_event == NULL) { | |
5b4a0ec0 | 3247 | PERROR("realloc ust app events"); |
c617c0c6 | 3248 | free(tmp_event); |
5b4a0ec0 DG |
3249 | ret = -ENOMEM; |
3250 | goto rcu_error; | |
3251 | } | |
53efb85a MD |
3252 | /* Zero the new memory */ |
3253 | memset(new_tmp_event + nbmem, 0, | |
3254 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3255 | nbmem = new_nbmem; | |
3256 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3257 | } |
c617c0c6 MD |
3258 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3259 | tmp_event[count].loglevel = uiter.loglevel; | |
3260 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3261 | tmp_event[count].pid = app->pid; | |
3262 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3263 | count++; |
421cb601 | 3264 | } |
421cb601 DG |
3265 | } |
3266 | ||
5b4a0ec0 | 3267 | ret = count; |
c617c0c6 | 3268 | *events = tmp_event; |
421cb601 | 3269 | |
5b4a0ec0 | 3270 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3271 | |
5b4a0ec0 DG |
3272 | rcu_error: |
3273 | rcu_read_unlock(); | |
421cb601 | 3274 | error: |
840cb59c | 3275 | health_code_update(); |
5b4a0ec0 | 3276 | return ret; |
421cb601 DG |
3277 | } |
3278 | ||
f37d259d MD |
3279 | /* |
3280 | * Fill events array with all events name of all registered apps. | |
3281 | */ | |
3282 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3283 | { | |
3284 | int ret, handle; | |
3285 | size_t nbmem, count = 0; | |
3286 | struct lttng_ht_iter iter; | |
3287 | struct ust_app *app; | |
c617c0c6 | 3288 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3289 | |
3290 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3291 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3292 | if (tmp_event == NULL) { | |
f37d259d MD |
3293 | PERROR("zmalloc ust app event fields"); |
3294 | ret = -ENOMEM; | |
3295 | goto error; | |
3296 | } | |
3297 | ||
3298 | rcu_read_lock(); | |
3299 | ||
3300 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3301 | struct lttng_ust_field_iter uiter; | |
3302 | ||
840cb59c | 3303 | health_code_update(); |
86acf0da | 3304 | |
f37d259d MD |
3305 | if (!app->compatible) { |
3306 | /* | |
3307 | * TODO: In time, we should notice the caller of this error by | |
3308 | * telling him that this is a version error. | |
3309 | */ | |
3310 | continue; | |
3311 | } | |
3312 | handle = ustctl_tracepoint_field_list(app->sock); | |
3313 | if (handle < 0) { | |
ffe60014 DG |
3314 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3315 | ERR("UST app list field getting handle failed for app pid %d", | |
3316 | app->pid); | |
3317 | } | |
f37d259d MD |
3318 | continue; |
3319 | } | |
3320 | ||
3321 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3322 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3323 | /* Handle ustctl error. */ |
3324 | if (ret < 0) { | |
a2ba1ab0 | 3325 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3326 | ERR("UST app tp list field failed for app %d with ret %d", |
3327 | app->sock, ret); | |
3328 | } else { | |
3329 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3330 | /* |
3331 | * This is normal behavior, an application can die during the | |
3332 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3333 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3334 | */ |
3335 | break; | |
ffe60014 | 3336 | } |
98f595d4 | 3337 | free(tmp_event); |
ffe60014 DG |
3338 | goto rcu_error; |
3339 | } | |
3340 | ||
840cb59c | 3341 | health_code_update(); |
f37d259d | 3342 | if (count >= nbmem) { |
d7b3776f | 3343 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3344 | struct lttng_event_field *new_tmp_event; |
3345 | size_t new_nbmem; | |
3346 | ||
3347 | new_nbmem = nbmem << 1; | |
3348 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3349 | nbmem, new_nbmem); | |
3350 | new_tmp_event = realloc(tmp_event, | |
3351 | new_nbmem * sizeof(struct lttng_event_field)); | |
3352 | if (new_tmp_event == NULL) { | |
f37d259d | 3353 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3354 | free(tmp_event); |
f37d259d MD |
3355 | ret = -ENOMEM; |
3356 | goto rcu_error; | |
3357 | } | |
53efb85a MD |
3358 | /* Zero the new memory */ |
3359 | memset(new_tmp_event + nbmem, 0, | |
3360 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3361 | nbmem = new_nbmem; | |
3362 | tmp_event = new_tmp_event; | |
f37d259d | 3363 | } |
f37d259d | 3364 | |
c617c0c6 | 3365 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3366 | /* Mapping between these enums matches 1 to 1. */ |
3367 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3368 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3369 | |
c617c0c6 MD |
3370 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3371 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3372 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3373 | tmp_event[count].event.pid = app->pid; |
3374 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3375 | count++; |
3376 | } | |
3377 | } | |
3378 | ||
3379 | ret = count; | |
c617c0c6 | 3380 | *fields = tmp_event; |
f37d259d MD |
3381 | |
3382 | DBG2("UST app list event fields done (%zu events)", count); | |
3383 | ||
3384 | rcu_error: | |
3385 | rcu_read_unlock(); | |
3386 | error: | |
840cb59c | 3387 | health_code_update(); |
f37d259d MD |
3388 | return ret; |
3389 | } | |
3390 | ||
5b4a0ec0 DG |
3391 | /* |
3392 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3393 | * |
3394 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3395 | */ |
3396 | void ust_app_clean_list(void) | |
421cb601 | 3397 | { |
5b4a0ec0 | 3398 | int ret; |
659ed79f | 3399 | struct ust_app *app; |
bec39940 | 3400 | struct lttng_ht_iter iter; |
421cb601 | 3401 | |
5b4a0ec0 | 3402 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3403 | |
5b4a0ec0 | 3404 | rcu_read_lock(); |
421cb601 | 3405 | |
659ed79f | 3406 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3407 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3408 | assert(!ret); |
659ed79f | 3409 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3410 | } |
3411 | ||
852d0037 | 3412 | /* Cleanup socket hash table */ |
659ed79f DG |
3413 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3414 | sock_n.node) { | |
852d0037 | 3415 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3416 | assert(!ret); |
3417 | } | |
852d0037 | 3418 | |
d88aee68 DG |
3419 | /* Cleanup notify socket hash table */ |
3420 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3421 | notify_sock_n.node) { | |
3422 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3423 | assert(!ret); | |
3424 | } | |
36b588ed | 3425 | rcu_read_unlock(); |
d88aee68 | 3426 | |
bec39940 | 3427 | /* Destroy is done only when the ht is empty */ |
0b2dc8df MD |
3428 | ht_cleanup_push(ust_app_ht); |
3429 | ht_cleanup_push(ust_app_ht_by_sock); | |
3430 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
5b4a0ec0 DG |
3431 | } |
3432 | ||
3433 | /* | |
3434 | * Init UST app hash table. | |
3435 | */ | |
3436 | void ust_app_ht_alloc(void) | |
3437 | { | |
bec39940 | 3438 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3439 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3440 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3441 | } |
3442 | ||
78f0bacd DG |
3443 | /* |
3444 | * For a specific UST session, disable the channel for all registered apps. | |
3445 | */ | |
35a9059d | 3446 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3447 | struct ltt_ust_channel *uchan) |
3448 | { | |
3449 | int ret = 0; | |
bec39940 DG |
3450 | struct lttng_ht_iter iter; |
3451 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3452 | struct ust_app *app; |
3453 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3454 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3455 | |
3456 | if (usess == NULL || uchan == NULL) { | |
3457 | ERR("Disabling UST global channel with NULL values"); | |
3458 | ret = -1; | |
3459 | goto error; | |
3460 | } | |
3461 | ||
d9bf3ca4 | 3462 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3463 | uchan->name, usess->id); |
78f0bacd DG |
3464 | |
3465 | rcu_read_lock(); | |
3466 | ||
3467 | /* For every registered applications */ | |
852d0037 | 3468 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3469 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3470 | if (!app->compatible) { |
3471 | /* | |
3472 | * TODO: In time, we should notice the caller of this error by | |
3473 | * telling him that this is a version error. | |
3474 | */ | |
3475 | continue; | |
3476 | } | |
78f0bacd DG |
3477 | ua_sess = lookup_session_by_app(usess, app); |
3478 | if (ua_sess == NULL) { | |
3479 | continue; | |
3480 | } | |
3481 | ||
8535a6d9 | 3482 | /* Get channel */ |
bec39940 DG |
3483 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3484 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3485 | /* If the session if found for the app, the channel must be there */ |
3486 | assert(ua_chan_node); | |
3487 | ||
3488 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3489 | /* The channel must not be already disabled */ | |
3490 | assert(ua_chan->enabled == 1); | |
3491 | ||
3492 | /* Disable channel onto application */ | |
3493 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3494 | if (ret < 0) { |
3495 | /* XXX: We might want to report this error at some point... */ | |
3496 | continue; | |
3497 | } | |
3498 | } | |
3499 | ||
3500 | rcu_read_unlock(); | |
3501 | ||
3502 | error: | |
3503 | return ret; | |
3504 | } | |
3505 | ||
3506 | /* | |
3507 | * For a specific UST session, enable the channel for all registered apps. | |
3508 | */ | |
35a9059d | 3509 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3510 | struct ltt_ust_channel *uchan) |
3511 | { | |
3512 | int ret = 0; | |
bec39940 | 3513 | struct lttng_ht_iter iter; |
78f0bacd DG |
3514 | struct ust_app *app; |
3515 | struct ust_app_session *ua_sess; | |
3516 | ||
3517 | if (usess == NULL || uchan == NULL) { | |
3518 | ERR("Adding UST global channel to NULL values"); | |
3519 | ret = -1; | |
3520 | goto error; | |
3521 | } | |
3522 | ||
d9bf3ca4 | 3523 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3524 | uchan->name, usess->id); |
78f0bacd DG |
3525 | |
3526 | rcu_read_lock(); | |
3527 | ||
3528 | /* For every registered applications */ | |
852d0037 | 3529 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3530 | if (!app->compatible) { |
3531 | /* | |
3532 | * TODO: In time, we should notice the caller of this error by | |
3533 | * telling him that this is a version error. | |
3534 | */ | |
3535 | continue; | |
3536 | } | |
78f0bacd DG |
3537 | ua_sess = lookup_session_by_app(usess, app); |
3538 | if (ua_sess == NULL) { | |
3539 | continue; | |
3540 | } | |
3541 | ||
3542 | /* Enable channel onto application */ | |
3543 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3544 | if (ret < 0) { | |
3545 | /* XXX: We might want to report this error at some point... */ | |
3546 | continue; | |
3547 | } | |
3548 | } | |
3549 | ||
3550 | rcu_read_unlock(); | |
3551 | ||
3552 | error: | |
3553 | return ret; | |
3554 | } | |
3555 | ||
b0a40d28 DG |
3556 | /* |
3557 | * Disable an event in a channel and for a specific session. | |
3558 | */ | |
35a9059d DG |
3559 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3560 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3561 | { |
3562 | int ret = 0; | |
bec39940 DG |
3563 | struct lttng_ht_iter iter, uiter; |
3564 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3565 | struct ust_app *app; |
3566 | struct ust_app_session *ua_sess; | |
3567 | struct ust_app_channel *ua_chan; | |
3568 | struct ust_app_event *ua_event; | |
3569 | ||
3570 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3571 | "%s for session id %" PRIu64, |
3572 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3573 | |
3574 | rcu_read_lock(); | |
3575 | ||
3576 | /* For all registered applications */ | |
852d0037 | 3577 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3578 | if (!app->compatible) { |
3579 | /* | |
3580 | * TODO: In time, we should notice the caller of this error by | |
3581 | * telling him that this is a version error. | |
3582 | */ | |
3583 | continue; | |
3584 | } | |
b0a40d28 DG |
3585 | ua_sess = lookup_session_by_app(usess, app); |
3586 | if (ua_sess == NULL) { | |
3587 | /* Next app */ | |
3588 | continue; | |
3589 | } | |
3590 | ||
3591 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3592 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3593 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3594 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3595 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3596 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3597 | continue; |
3598 | } | |
3599 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3600 | ||
bec39940 DG |
3601 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3602 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3603 | if (ua_event_node == NULL) { |
3604 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3605 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3606 | continue; |
3607 | } | |
3608 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3609 | ||
7f79d3a1 | 3610 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3611 | if (ret < 0) { |
3612 | /* XXX: Report error someday... */ | |
3613 | continue; | |
3614 | } | |
3615 | } | |
3616 | ||
3617 | rcu_read_unlock(); | |
3618 | ||
3619 | return ret; | |
3620 | } | |
3621 | ||
421cb601 | 3622 | /* |
5b4a0ec0 | 3623 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3624 | */ |
35a9059d | 3625 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3626 | struct ltt_ust_channel *uchan) |
3627 | { | |
3d8ca23b | 3628 | int ret = 0, created; |
bec39940 | 3629 | struct lttng_ht_iter iter; |
48842b30 | 3630 | struct ust_app *app; |
3d8ca23b | 3631 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3632 | |
fc34caaa DG |
3633 | /* Very wrong code flow */ |
3634 | assert(usess); | |
3635 | assert(uchan); | |
421cb601 | 3636 | |
d9bf3ca4 | 3637 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3638 | uchan->name, usess->id); |
48842b30 DG |
3639 | |
3640 | rcu_read_lock(); | |
421cb601 | 3641 | |
5b4a0ec0 | 3642 | /* For every registered applications */ |
852d0037 | 3643 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3644 | if (!app->compatible) { |
3645 | /* | |
3646 | * TODO: In time, we should notice the caller of this error by | |
3647 | * telling him that this is a version error. | |
3648 | */ | |
3649 | continue; | |
3650 | } | |
edb67388 DG |
3651 | /* |
3652 | * Create session on the tracer side and add it to app session HT. Note | |
3653 | * that if session exist, it will simply return a pointer to the ust | |
3654 | * app session. | |
3655 | */ | |
3d8ca23b DG |
3656 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3657 | if (ret < 0) { | |
3658 | switch (ret) { | |
3659 | case -ENOTCONN: | |
3660 | /* | |
3661 | * The application's socket is not valid. Either a bad socket | |
3662 | * or a timeout on it. We can't inform the caller that for a | |
3663 | * specific app, the session failed so lets continue here. | |
3664 | */ | |
3665 | continue; | |
3666 | case -ENOMEM: | |
3667 | default: | |
3668 | goto error_rcu_unlock; | |
3669 | } | |
48842b30 | 3670 | } |
3d8ca23b | 3671 | assert(ua_sess); |
48842b30 | 3672 | |
d0b96690 | 3673 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3674 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3675 | sizeof(uchan->name))) { | |
ad7a9107 DG |
3676 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
3677 | ret = 0; | |
d65d2de8 DG |
3678 | } else { |
3679 | /* Create channel onto application. We don't need the chan ref. */ | |
3680 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3681 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3682 | } | |
d0b96690 | 3683 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3684 | if (ret < 0) { |
3685 | if (ret == -ENOMEM) { | |
3686 | /* No more memory is a fatal error. Stop right now. */ | |
3687 | goto error_rcu_unlock; | |
3688 | } | |
3689 | /* Cleanup the created session if it's the case. */ | |
3690 | if (created) { | |
d0b96690 | 3691 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3692 | } |
48842b30 | 3693 | } |
48842b30 | 3694 | } |
5b4a0ec0 | 3695 | |
95e047ff | 3696 | error_rcu_unlock: |
48842b30 | 3697 | rcu_read_unlock(); |
3c14c33f | 3698 | return ret; |
48842b30 DG |
3699 | } |
3700 | ||
5b4a0ec0 | 3701 | /* |
edb67388 | 3702 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3703 | */ |
35a9059d | 3704 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3705 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3706 | { | |
3707 | int ret = 0; | |
bec39940 | 3708 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3709 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3710 | struct ust_app *app; |
3711 | struct ust_app_session *ua_sess; | |
3712 | struct ust_app_channel *ua_chan; | |
3713 | struct ust_app_event *ua_event; | |
48842b30 | 3714 | |
d9bf3ca4 | 3715 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3716 | uevent->attr.name, usess->id); |
48842b30 | 3717 | |
edb67388 DG |
3718 | /* |
3719 | * NOTE: At this point, this function is called only if the session and | |
3720 | * channel passed are already created for all apps. and enabled on the | |
3721 | * tracer also. | |
3722 | */ | |
3723 | ||
48842b30 | 3724 | rcu_read_lock(); |
421cb601 DG |
3725 | |
3726 | /* For all registered applications */ | |
852d0037 | 3727 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3728 | if (!app->compatible) { |
3729 | /* | |
3730 | * TODO: In time, we should notice the caller of this error by | |
3731 | * telling him that this is a version error. | |
3732 | */ | |
3733 | continue; | |
3734 | } | |
edb67388 | 3735 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3736 | if (!ua_sess) { |
3737 | /* The application has problem or is probably dead. */ | |
3738 | continue; | |
3739 | } | |
ba767faf | 3740 | |
d0b96690 DG |
3741 | pthread_mutex_lock(&ua_sess->lock); |
3742 | ||
edb67388 | 3743 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3744 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3745 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3746 | /* If the channel is not found, there is a code flow error */ |
3747 | assert(ua_chan_node); | |
3748 | ||
3749 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3750 | ||
18eace3b DG |
3751 | /* Get event node */ |
3752 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 3753 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3754 | if (ua_event == NULL) { |
7f79d3a1 | 3755 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3756 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3757 | goto next_app; |
35a9059d | 3758 | } |
35a9059d DG |
3759 | |
3760 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3761 | if (ret < 0) { | |
d0b96690 | 3762 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3763 | goto error; |
48842b30 | 3764 | } |
d0b96690 DG |
3765 | next_app: |
3766 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3767 | } |
3768 | ||
7f79d3a1 | 3769 | error: |
edb67388 | 3770 | rcu_read_unlock(); |
edb67388 DG |
3771 | return ret; |
3772 | } | |
3773 | ||
3774 | /* | |
3775 | * For a specific existing UST session and UST channel, creates the event for | |
3776 | * all registered apps. | |
3777 | */ | |
35a9059d | 3778 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3779 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3780 | { | |
3781 | int ret = 0; | |
bec39940 DG |
3782 | struct lttng_ht_iter iter, uiter; |
3783 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3784 | struct ust_app *app; |
3785 | struct ust_app_session *ua_sess; | |
3786 | struct ust_app_channel *ua_chan; | |
3787 | ||
d9bf3ca4 | 3788 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3789 | uevent->attr.name, usess->id); |
edb67388 | 3790 | |
edb67388 DG |
3791 | rcu_read_lock(); |
3792 | ||
3793 | /* For all registered applications */ | |
852d0037 | 3794 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3795 | if (!app->compatible) { |
3796 | /* | |
3797 | * TODO: In time, we should notice the caller of this error by | |
3798 | * telling him that this is a version error. | |
3799 | */ | |
3800 | continue; | |
3801 | } | |
edb67388 | 3802 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3803 | if (!ua_sess) { |
3804 | /* The application has problem or is probably dead. */ | |
3805 | continue; | |
3806 | } | |
48842b30 | 3807 | |
d0b96690 | 3808 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3809 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3810 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3811 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3812 | /* If the channel is not found, there is a code flow error */ |
3813 | assert(ua_chan_node); | |
3814 | ||
48842b30 DG |
3815 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3816 | ||
edb67388 | 3817 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3818 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3819 | if (ret < 0) { |
49c336c1 | 3820 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3821 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3822 | break; | |
3823 | } | |
3824 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3825 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3826 | continue; |
48842b30 | 3827 | } |
48842b30 | 3828 | } |
5b4a0ec0 | 3829 | |
48842b30 DG |
3830 | rcu_read_unlock(); |
3831 | ||
3832 | return ret; | |
3833 | } | |
3834 | ||
5b4a0ec0 DG |
3835 | /* |
3836 | * Start tracing for a specific UST session and app. | |
3837 | */ | |
b34cbebf | 3838 | static |
421cb601 | 3839 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3840 | { |
3841 | int ret = 0; | |
48842b30 | 3842 | struct ust_app_session *ua_sess; |
48842b30 | 3843 | |
852d0037 | 3844 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3845 | |
509cbaf8 MD |
3846 | rcu_read_lock(); |
3847 | ||
e0c7ec2b DG |
3848 | if (!app->compatible) { |
3849 | goto end; | |
3850 | } | |
3851 | ||
421cb601 DG |
3852 | ua_sess = lookup_session_by_app(usess, app); |
3853 | if (ua_sess == NULL) { | |
d42f20df DG |
3854 | /* The session is in teardown process. Ignore and continue. */ |
3855 | goto end; | |
421cb601 | 3856 | } |
48842b30 | 3857 | |
d0b96690 DG |
3858 | pthread_mutex_lock(&ua_sess->lock); |
3859 | ||
aea829b3 DG |
3860 | /* Upon restart, we skip the setup, already done */ |
3861 | if (ua_sess->started) { | |
8be98f9a | 3862 | goto skip_setup; |
aea829b3 | 3863 | } |
8be98f9a | 3864 | |
a4b92340 DG |
3865 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3866 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3867 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3868 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3869 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3870 | if (ret < 0) { |
3871 | if (ret != -EEXIST) { | |
3872 | ERR("Trace directory creation error"); | |
d0b96690 | 3873 | goto error_unlock; |
421cb601 | 3874 | } |
173af62f | 3875 | } |
7753dea8 | 3876 | } |
aea829b3 | 3877 | |
d65d2de8 DG |
3878 | /* |
3879 | * Create the metadata for the application. This returns gracefully if a | |
3880 | * metadata was already set for the session. | |
3881 | */ | |
ad7a9107 | 3882 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 3883 | if (ret < 0) { |
d0b96690 | 3884 | goto error_unlock; |
421cb601 | 3885 | } |
48842b30 | 3886 | |
840cb59c | 3887 | health_code_update(); |
86acf0da | 3888 | |
8be98f9a | 3889 | skip_setup: |
421cb601 | 3890 | /* This start the UST tracing */ |
852d0037 | 3891 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3892 | if (ret < 0) { |
ffe60014 DG |
3893 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3894 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3895 | app->pid, ret); | |
3896 | } else { | |
3897 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
3898 | /* |
3899 | * This is normal behavior, an application can die during the | |
3900 | * creation process. Don't report an error so the execution can | |
3901 | * continue normally. | |
3902 | */ | |
3903 | pthread_mutex_unlock(&ua_sess->lock); | |
3904 | goto end; | |
ffe60014 | 3905 | } |
d0b96690 | 3906 | goto error_unlock; |
421cb601 | 3907 | } |
5b4a0ec0 | 3908 | |
55c3953d DG |
3909 | /* Indicate that the session has been started once */ |
3910 | ua_sess->started = 1; | |
3911 | ||
d0b96690 DG |
3912 | pthread_mutex_unlock(&ua_sess->lock); |
3913 | ||
840cb59c | 3914 | health_code_update(); |
86acf0da | 3915 | |
421cb601 | 3916 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3917 | ret = ustctl_wait_quiescent(app->sock); |
3918 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3919 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3920 | app->pid, ret); | |
3921 | } | |
48842b30 | 3922 | |
e0c7ec2b DG |
3923 | end: |
3924 | rcu_read_unlock(); | |
840cb59c | 3925 | health_code_update(); |
421cb601 | 3926 | return 0; |
48842b30 | 3927 | |
d0b96690 DG |
3928 | error_unlock: |
3929 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3930 | rcu_read_unlock(); |
840cb59c | 3931 | health_code_update(); |
421cb601 DG |
3932 | return -1; |
3933 | } | |
48842b30 | 3934 | |
8be98f9a MD |
3935 | /* |
3936 | * Stop tracing for a specific UST session and app. | |
3937 | */ | |
b34cbebf | 3938 | static |
8be98f9a MD |
3939 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3940 | { | |
3941 | int ret = 0; | |
3942 | struct ust_app_session *ua_sess; | |
7972aab2 | 3943 | struct ust_registry_session *registry; |
8be98f9a | 3944 | |
852d0037 | 3945 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3946 | |
3947 | rcu_read_lock(); | |
3948 | ||
e0c7ec2b | 3949 | if (!app->compatible) { |
d88aee68 | 3950 | goto end_no_session; |
e0c7ec2b DG |
3951 | } |
3952 | ||
8be98f9a MD |
3953 | ua_sess = lookup_session_by_app(usess, app); |
3954 | if (ua_sess == NULL) { | |
d88aee68 | 3955 | goto end_no_session; |
8be98f9a MD |
3956 | } |
3957 | ||
d88aee68 DG |
3958 | pthread_mutex_lock(&ua_sess->lock); |
3959 | ||
9bc07046 DG |
3960 | /* |
3961 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3962 | * that was never started. It's possible since we can have a fail start |
3963 | * from either the application manager thread or the command thread. Simply | |
3964 | * indicate that this is a stop error. | |
9bc07046 | 3965 | */ |
f9dfc3d9 | 3966 | if (!ua_sess->started) { |
c45536e1 DG |
3967 | goto error_rcu_unlock; |
3968 | } | |
7db205b5 | 3969 | |
840cb59c | 3970 | health_code_update(); |
86acf0da | 3971 | |
9d6c7d3f | 3972 | /* This inhibits UST tracing */ |
852d0037 | 3973 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3974 | if (ret < 0) { |
ffe60014 DG |
3975 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3976 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3977 | app->pid, ret); | |
3978 | } else { | |
3979 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
3980 | /* |
3981 | * This is normal behavior, an application can die during the | |
3982 | * creation process. Don't report an error so the execution can | |
3983 | * continue normally. | |
3984 | */ | |
3985 | goto end_unlock; | |
ffe60014 | 3986 | } |
9d6c7d3f DG |
3987 | goto error_rcu_unlock; |
3988 | } | |
3989 | ||
840cb59c | 3990 | health_code_update(); |
86acf0da | 3991 | |
9d6c7d3f | 3992 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3993 | ret = ustctl_wait_quiescent(app->sock); |
3994 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3995 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3996 | app->pid, ret); | |
3997 | } | |
9d6c7d3f | 3998 | |
840cb59c | 3999 | health_code_update(); |
86acf0da | 4000 | |
b34cbebf MD |
4001 | registry = get_session_registry(ua_sess); |
4002 | assert(registry); | |
1b532a60 DG |
4003 | |
4004 | if (!registry->metadata_closed) { | |
4005 | /* Push metadata for application before freeing the application. */ | |
4006 | (void) push_metadata(registry, ua_sess->consumer); | |
4007 | } | |
b34cbebf | 4008 | |
3757b385 | 4009 | end_unlock: |
b34cbebf MD |
4010 | pthread_mutex_unlock(&ua_sess->lock); |
4011 | end_no_session: | |
4012 | rcu_read_unlock(); | |
4013 | health_code_update(); | |
4014 | return 0; | |
4015 | ||
4016 | error_rcu_unlock: | |
4017 | pthread_mutex_unlock(&ua_sess->lock); | |
4018 | rcu_read_unlock(); | |
4019 | health_code_update(); | |
4020 | return -1; | |
4021 | } | |
4022 | ||
b34cbebf | 4023 | static |
774a7dbd MD |
4024 | int ust_app_flush_app_session(struct ust_app *app, |
4025 | struct ust_app_session *ua_sess) | |
b34cbebf | 4026 | { |
774a7dbd | 4027 | int ret, retval = 0; |
b34cbebf | 4028 | struct lttng_ht_iter iter; |
b34cbebf | 4029 | struct ust_app_channel *ua_chan; |
774a7dbd | 4030 | struct consumer_socket *socket; |
b34cbebf | 4031 | |
774a7dbd | 4032 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4033 | |
4034 | rcu_read_lock(); | |
4035 | ||
4036 | if (!app->compatible) { | |
774a7dbd | 4037 | goto end_not_compatible; |
b34cbebf MD |
4038 | } |
4039 | ||
4040 | pthread_mutex_lock(&ua_sess->lock); | |
4041 | ||
4042 | health_code_update(); | |
4043 | ||
9d6c7d3f | 4044 | /* Flushing buffers */ |
774a7dbd MD |
4045 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4046 | ua_sess->consumer); | |
bec39940 DG |
4047 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4048 | node.node) { | |
840cb59c | 4049 | health_code_update(); |
ffe60014 | 4050 | assert(ua_chan->is_sent); |
774a7dbd MD |
4051 | ret = consumer_flush_channel(socket, ua_chan->key); |
4052 | if (ret) { | |
4053 | ERR("Error flushing consumer channel"); | |
4054 | retval = -1; | |
6d3686da | 4055 | continue; |
8be98f9a MD |
4056 | } |
4057 | } | |
8be98f9a | 4058 | |
840cb59c | 4059 | health_code_update(); |
86acf0da | 4060 | |
d88aee68 | 4061 | pthread_mutex_unlock(&ua_sess->lock); |
774a7dbd MD |
4062 | end_not_compatible: |
4063 | rcu_read_unlock(); | |
4064 | health_code_update(); | |
4065 | return retval; | |
4066 | } | |
4067 | ||
4068 | /* | |
4069 | * Flush buffers for a specific UST session and app. | |
4070 | */ | |
4071 | static | |
4072 | int ust_app_flush_session(struct ust_app *app, struct ltt_ust_session *usess) | |
4073 | ||
4074 | { | |
4075 | int ret; | |
4076 | struct ust_app_session *ua_sess; | |
4077 | ||
4078 | DBG("Flushing session buffers for ust app pid %d", app->pid); | |
4079 | ||
4080 | rcu_read_lock(); | |
4081 | ||
4082 | ua_sess = lookup_session_by_app(usess, app); | |
4083 | if (ua_sess == NULL) { | |
4084 | ret = -1; | |
4085 | goto end_no_session; | |
4086 | } | |
4087 | ret = ust_app_flush_app_session(app, ua_sess); | |
4088 | ||
d88aee68 | 4089 | end_no_session: |
7db205b5 | 4090 | rcu_read_unlock(); |
840cb59c | 4091 | health_code_update(); |
774a7dbd | 4092 | return ret; |
8be98f9a MD |
4093 | } |
4094 | ||
84cd17c6 MD |
4095 | /* |
4096 | * Destroy a specific UST session in apps. | |
4097 | */ | |
3353de95 | 4098 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4099 | { |
ffe60014 | 4100 | int ret; |
84cd17c6 | 4101 | struct ust_app_session *ua_sess; |
bec39940 | 4102 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4103 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4104 | |
852d0037 | 4105 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4106 | |
4107 | rcu_read_lock(); | |
4108 | ||
e0c7ec2b DG |
4109 | if (!app->compatible) { |
4110 | goto end; | |
4111 | } | |
4112 | ||
84cd17c6 | 4113 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4114 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4115 | if (node == NULL) { |
d42f20df DG |
4116 | /* Session is being or is deleted. */ |
4117 | goto end; | |
84cd17c6 MD |
4118 | } |
4119 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4120 | |
840cb59c | 4121 | health_code_update(); |
d0b96690 | 4122 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4123 | |
840cb59c | 4124 | health_code_update(); |
7db205b5 | 4125 | |
84cd17c6 | 4126 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4127 | ret = ustctl_wait_quiescent(app->sock); |
4128 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4129 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4130 | app->pid, ret); | |
4131 | } | |
e0c7ec2b DG |
4132 | end: |
4133 | rcu_read_unlock(); | |
840cb59c | 4134 | health_code_update(); |
84cd17c6 | 4135 | return 0; |
84cd17c6 MD |
4136 | } |
4137 | ||
5b4a0ec0 DG |
4138 | /* |
4139 | * Start tracing for the UST session. | |
4140 | */ | |
421cb601 DG |
4141 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4142 | { | |
4143 | int ret = 0; | |
bec39940 | 4144 | struct lttng_ht_iter iter; |
421cb601 | 4145 | struct ust_app *app; |
48842b30 | 4146 | |
421cb601 DG |
4147 | DBG("Starting all UST traces"); |
4148 | ||
4149 | rcu_read_lock(); | |
421cb601 | 4150 | |
852d0037 | 4151 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4152 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4153 | if (ret < 0) { |
5b4a0ec0 DG |
4154 | /* Continue to next apps even on error */ |
4155 | continue; | |
48842b30 | 4156 | } |
48842b30 | 4157 | } |
5b4a0ec0 | 4158 | |
48842b30 DG |
4159 | rcu_read_unlock(); |
4160 | ||
4161 | return 0; | |
4162 | } | |
487cf67c | 4163 | |
8be98f9a MD |
4164 | /* |
4165 | * Start tracing for the UST session. | |
4166 | */ | |
4167 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4168 | { | |
4169 | int ret = 0; | |
bec39940 | 4170 | struct lttng_ht_iter iter; |
8be98f9a MD |
4171 | struct ust_app *app; |
4172 | ||
4173 | DBG("Stopping all UST traces"); | |
4174 | ||
4175 | rcu_read_lock(); | |
4176 | ||
b34cbebf MD |
4177 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4178 | ret = ust_app_stop_trace(usess, app); | |
4179 | if (ret < 0) { | |
4180 | /* Continue to next apps even on error */ | |
4181 | continue; | |
4182 | } | |
4183 | } | |
4184 | ||
b0a5f0fb | 4185 | /* Flush buffers and push metadata (for UID buffers). */ |
b34cbebf MD |
4186 | switch (usess->buffer_type) { |
4187 | case LTTNG_BUFFER_PER_UID: | |
4188 | { | |
7972aab2 | 4189 | struct buffer_reg_uid *reg; |
b34cbebf MD |
4190 | |
4191 | /* Flush all per UID buffers associated to that session. */ | |
7972aab2 | 4192 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
b0a5f0fb | 4193 | struct ust_registry_session *ust_session_reg; |
7972aab2 DG |
4194 | struct buffer_reg_channel *reg_chan; |
4195 | struct consumer_socket *socket; | |
4196 | ||
4197 | /* Get consumer socket to use to push the metadata.*/ | |
4198 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4199 | usess->consumer); | |
4200 | if (!socket) { | |
4201 | /* Ignore request if no consumer is found for the session. */ | |
4202 | continue; | |
4203 | } | |
4204 | ||
4205 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4206 | reg_chan, node.node) { | |
4207 | /* | |
4208 | * The following call will print error values so the return | |
4209 | * code is of little importance because whatever happens, we | |
4210 | * have to try them all. | |
4211 | */ | |
4212 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4213 | } | |
b0a5f0fb MD |
4214 | |
4215 | ust_session_reg = reg->registry->reg.ust; | |
4216 | if (!ust_session_reg->metadata_closed) { | |
4217 | /* Push metadata. */ | |
4218 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4219 | } | |
7972aab2 | 4220 | } |
b0a5f0fb | 4221 | |
b34cbebf | 4222 | break; |
7972aab2 | 4223 | } |
b34cbebf MD |
4224 | case LTTNG_BUFFER_PER_PID: |
4225 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
774a7dbd | 4226 | ret = ust_app_flush_session(app, usess); |
b34cbebf MD |
4227 | if (ret < 0) { |
4228 | /* Continue to next apps even on error */ | |
4229 | continue; | |
4230 | } | |
8be98f9a | 4231 | } |
b34cbebf MD |
4232 | break; |
4233 | default: | |
4234 | assert(0); | |
4235 | break; | |
8be98f9a MD |
4236 | } |
4237 | ||
4238 | rcu_read_unlock(); | |
4239 | ||
4240 | return 0; | |
4241 | } | |
4242 | ||
84cd17c6 MD |
4243 | /* |
4244 | * Destroy app UST session. | |
4245 | */ | |
4246 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4247 | { | |
4248 | int ret = 0; | |
bec39940 | 4249 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4250 | struct ust_app *app; |
4251 | ||
4252 | DBG("Destroy all UST traces"); | |
4253 | ||
4254 | rcu_read_lock(); | |
4255 | ||
852d0037 | 4256 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4257 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4258 | if (ret < 0) { |
4259 | /* Continue to next apps even on error */ | |
4260 | continue; | |
4261 | } | |
4262 | } | |
4263 | ||
4264 | rcu_read_unlock(); | |
4265 | ||
4266 | return 0; | |
4267 | } | |
4268 | ||
5b4a0ec0 DG |
4269 | /* |
4270 | * Add channels/events from UST global domain to registered apps at sock. | |
4271 | */ | |
487cf67c DG |
4272 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4273 | { | |
55c54cce | 4274 | int ret = 0; |
31746f93 | 4275 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4276 | struct ust_app *app; |
3d8ca23b | 4277 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4278 | struct ust_app_channel *ua_chan; |
4279 | struct ust_app_event *ua_event; | |
727d5404 | 4280 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4281 | |
95e047ff | 4282 | assert(usess); |
ffe60014 | 4283 | assert(sock >= 0); |
1f3580c7 | 4284 | |
d9bf3ca4 | 4285 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4286 | usess->id); |
487cf67c | 4287 | |
284d8f55 DG |
4288 | rcu_read_lock(); |
4289 | ||
f20baf8e | 4290 | app = ust_app_find_by_sock(sock); |
487cf67c | 4291 | if (app == NULL) { |
d88aee68 DG |
4292 | /* |
4293 | * Application can be unregistered before so this is possible hence | |
4294 | * simply stopping the update. | |
4295 | */ | |
4296 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4297 | goto error; |
4298 | } | |
4299 | ||
e0c7ec2b DG |
4300 | if (!app->compatible) { |
4301 | goto error; | |
4302 | } | |
4303 | ||
3d8ca23b DG |
4304 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4305 | if (ret < 0) { | |
4306 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4307 | goto error; |
4308 | } | |
3d8ca23b | 4309 | assert(ua_sess); |
487cf67c | 4310 | |
d0b96690 DG |
4311 | pthread_mutex_lock(&ua_sess->lock); |
4312 | ||
284d8f55 | 4313 | /* |
d0b96690 | 4314 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4315 | * app session above made a shadow copy of the UST global domain from the |
4316 | * ltt ust session. | |
4317 | */ | |
bec39940 DG |
4318 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4319 | node.node) { | |
ad7a9107 DG |
4320 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
4321 | if (ret < 0) { | |
4322 | /* | |
4323 | * Stop everything. On error, the application failed, no more | |
4324 | * file descriptor are available or ENOMEM so stopping here is | |
4325 | * the only thing we can do for now. | |
4326 | */ | |
4327 | goto error_unlock; | |
487cf67c DG |
4328 | } |
4329 | ||
31746f93 DG |
4330 | /* |
4331 | * Add context using the list so they are enabled in the same order the | |
4332 | * user added them. | |
4333 | */ | |
4334 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4335 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4336 | if (ret < 0) { | |
d0b96690 | 4337 | goto error_unlock; |
727d5404 DG |
4338 | } |
4339 | } | |
4340 | ||
4341 | ||
284d8f55 | 4342 | /* For each events */ |
bec39940 DG |
4343 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4344 | node.node) { | |
284d8f55 DG |
4345 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4346 | if (ret < 0) { | |
d0b96690 | 4347 | goto error_unlock; |
487cf67c | 4348 | } |
36dc12cc | 4349 | } |
487cf67c DG |
4350 | } |
4351 | ||
d0b96690 DG |
4352 | pthread_mutex_unlock(&ua_sess->lock); |
4353 | ||
14fb1ebe | 4354 | if (usess->active) { |
421cb601 | 4355 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4356 | if (ret < 0) { |
36dc12cc DG |
4357 | goto error; |
4358 | } | |
4359 | ||
852d0037 | 4360 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4361 | } |
4362 | ||
ffe60014 DG |
4363 | /* Everything went well at this point. */ |
4364 | rcu_read_unlock(); | |
4365 | return; | |
4366 | ||
d0b96690 DG |
4367 | error_unlock: |
4368 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4369 | error: |
ffe60014 | 4370 | if (ua_sess) { |
d0b96690 | 4371 | destroy_app_session(app, ua_sess); |
ffe60014 | 4372 | } |
487cf67c DG |
4373 | rcu_read_unlock(); |
4374 | return; | |
4375 | } | |
55cc08a6 DG |
4376 | |
4377 | /* | |
4378 | * Add context to a specific channel for global UST domain. | |
4379 | */ | |
4380 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4381 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4382 | { | |
4383 | int ret = 0; | |
bec39940 DG |
4384 | struct lttng_ht_node_str *ua_chan_node; |
4385 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4386 | struct ust_app_channel *ua_chan = NULL; |
4387 | struct ust_app_session *ua_sess; | |
4388 | struct ust_app *app; | |
4389 | ||
4390 | rcu_read_lock(); | |
4391 | ||
852d0037 | 4392 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4393 | if (!app->compatible) { |
4394 | /* | |
4395 | * TODO: In time, we should notice the caller of this error by | |
4396 | * telling him that this is a version error. | |
4397 | */ | |
4398 | continue; | |
4399 | } | |
55cc08a6 DG |
4400 | ua_sess = lookup_session_by_app(usess, app); |
4401 | if (ua_sess == NULL) { | |
4402 | continue; | |
4403 | } | |
4404 | ||
d0b96690 | 4405 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4406 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4407 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4408 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4409 | if (ua_chan_node == NULL) { |
d0b96690 | 4410 | goto next_app; |
55cc08a6 DG |
4411 | } |
4412 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4413 | node); | |
55cc08a6 DG |
4414 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4415 | if (ret < 0) { | |
d0b96690 | 4416 | goto next_app; |
55cc08a6 | 4417 | } |
d0b96690 DG |
4418 | next_app: |
4419 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4420 | } |
4421 | ||
55cc08a6 DG |
4422 | rcu_read_unlock(); |
4423 | return ret; | |
4424 | } | |
4425 | ||
76d45b40 DG |
4426 | /* |
4427 | * Enable event for a channel from a UST session for a specific PID. | |
4428 | */ | |
4429 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4430 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4431 | { | |
4432 | int ret = 0; | |
bec39940 | 4433 | struct lttng_ht_iter iter; |
18eace3b | 4434 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4435 | struct ust_app *app; |
4436 | struct ust_app_session *ua_sess; | |
4437 | struct ust_app_channel *ua_chan; | |
4438 | struct ust_app_event *ua_event; | |
4439 | ||
4440 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4441 | ||
4442 | rcu_read_lock(); | |
4443 | ||
4444 | app = ust_app_find_by_pid(pid); | |
4445 | if (app == NULL) { | |
4446 | ERR("UST app enable event per PID %d not found", pid); | |
4447 | ret = -1; | |
d0b96690 | 4448 | goto end; |
76d45b40 DG |
4449 | } |
4450 | ||
e0c7ec2b DG |
4451 | if (!app->compatible) { |
4452 | ret = 0; | |
d0b96690 | 4453 | goto end; |
e0c7ec2b DG |
4454 | } |
4455 | ||
76d45b40 | 4456 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4457 | if (!ua_sess) { |
4458 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4459 | ret = 0; |
4460 | goto end; | |
c4a1715b | 4461 | } |
76d45b40 | 4462 | |
d0b96690 | 4463 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4464 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4465 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4466 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4467 | /* If the channel is not found, there is a code flow error */ |
4468 | assert(ua_chan_node); | |
4469 | ||
4470 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4471 | ||
18eace3b | 4472 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 4473 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4474 | if (ua_event == NULL) { |
76d45b40 DG |
4475 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4476 | if (ret < 0) { | |
d0b96690 | 4477 | goto end_unlock; |
76d45b40 DG |
4478 | } |
4479 | } else { | |
76d45b40 DG |
4480 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4481 | if (ret < 0) { | |
d0b96690 | 4482 | goto end_unlock; |
76d45b40 DG |
4483 | } |
4484 | } | |
4485 | ||
d0b96690 DG |
4486 | end_unlock: |
4487 | pthread_mutex_unlock(&ua_sess->lock); | |
4488 | end: | |
76d45b40 DG |
4489 | rcu_read_unlock(); |
4490 | return ret; | |
4491 | } | |
7f79d3a1 | 4492 | |
4466912f DG |
4493 | /* |
4494 | * Calibrate registered applications. | |
4495 | */ | |
4496 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4497 | { | |
4498 | int ret = 0; | |
4499 | struct lttng_ht_iter iter; | |
4500 | struct ust_app *app; | |
4501 | ||
4502 | rcu_read_lock(); | |
4503 | ||
852d0037 | 4504 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4505 | if (!app->compatible) { |
4506 | /* | |
4507 | * TODO: In time, we should notice the caller of this error by | |
4508 | * telling him that this is a version error. | |
4509 | */ | |
4510 | continue; | |
4511 | } | |
4512 | ||
840cb59c | 4513 | health_code_update(); |
86acf0da | 4514 | |
852d0037 | 4515 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4516 | if (ret < 0) { |
4517 | switch (ret) { | |
4518 | case -ENOSYS: | |
4519 | /* Means that it's not implemented on the tracer side. */ | |
4520 | ret = 0; | |
4521 | break; | |
4522 | default: | |
4466912f | 4523 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4524 | app->pid, ret); |
4466912f DG |
4525 | break; |
4526 | } | |
4527 | } | |
4528 | } | |
4529 | ||
4530 | DBG("UST app global domain calibration finished"); | |
4531 | ||
4532 | rcu_read_unlock(); | |
4533 | ||
840cb59c | 4534 | health_code_update(); |
86acf0da | 4535 | |
4466912f DG |
4536 | return ret; |
4537 | } | |
d0b96690 DG |
4538 | |
4539 | /* | |
4540 | * Receive registration and populate the given msg structure. | |
4541 | * | |
4542 | * On success return 0 else a negative value returned by the ustctl call. | |
4543 | */ | |
4544 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4545 | { | |
4546 | int ret; | |
4547 | uint32_t pid, ppid, uid, gid; | |
4548 | ||
4549 | assert(msg); | |
4550 | ||
4551 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4552 | &pid, &ppid, &uid, &gid, | |
4553 | &msg->bits_per_long, | |
4554 | &msg->uint8_t_alignment, | |
4555 | &msg->uint16_t_alignment, | |
4556 | &msg->uint32_t_alignment, | |
4557 | &msg->uint64_t_alignment, | |
4558 | &msg->long_alignment, | |
4559 | &msg->byte_order, | |
4560 | msg->name); | |
4561 | if (ret < 0) { | |
4562 | switch (-ret) { | |
4563 | case EPIPE: | |
4564 | case ECONNRESET: | |
4565 | case LTTNG_UST_ERR_EXITING: | |
4566 | DBG3("UST app recv reg message failed. Application died"); | |
4567 | break; | |
4568 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4569 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4570 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4571 | LTTNG_UST_ABI_MINOR_VERSION); | |
4572 | break; | |
4573 | default: | |
4574 | ERR("UST app recv reg message failed with ret %d", ret); | |
4575 | break; | |
4576 | } | |
4577 | goto error; | |
4578 | } | |
4579 | msg->pid = (pid_t) pid; | |
4580 | msg->ppid = (pid_t) ppid; | |
4581 | msg->uid = (uid_t) uid; | |
4582 | msg->gid = (gid_t) gid; | |
4583 | ||
4584 | error: | |
4585 | return ret; | |
4586 | } | |
4587 | ||
d88aee68 DG |
4588 | /* |
4589 | * Return a ust app channel object using the application object and the channel | |
4590 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4591 | * lock MUST be acquired before calling this function. | |
4592 | */ | |
d0b96690 DG |
4593 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4594 | int objd) | |
4595 | { | |
4596 | struct lttng_ht_node_ulong *node; | |
4597 | struct lttng_ht_iter iter; | |
4598 | struct ust_app_channel *ua_chan = NULL; | |
4599 | ||
4600 | assert(app); | |
4601 | ||
4602 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4603 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4604 | if (node == NULL) { | |
4605 | DBG2("UST app channel find by objd %d not found", objd); | |
4606 | goto error; | |
4607 | } | |
4608 | ||
4609 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4610 | ||
4611 | error: | |
4612 | return ua_chan; | |
4613 | } | |
4614 | ||
d88aee68 DG |
4615 | /* |
4616 | * Reply to a register channel notification from an application on the notify | |
4617 | * socket. The channel metadata is also created. | |
4618 | * | |
4619 | * The session UST registry lock is acquired in this function. | |
4620 | * | |
4621 | * On success 0 is returned else a negative value. | |
4622 | */ | |
d0b96690 DG |
4623 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4624 | size_t nr_fields, struct ustctl_field *fields) | |
4625 | { | |
4626 | int ret, ret_code = 0; | |
4627 | uint32_t chan_id, reg_count; | |
7972aab2 | 4628 | uint64_t chan_reg_key; |
d0b96690 DG |
4629 | enum ustctl_channel_header type; |
4630 | struct ust_app *app; | |
4631 | struct ust_app_channel *ua_chan; | |
4632 | struct ust_app_session *ua_sess; | |
7972aab2 | 4633 | struct ust_registry_session *registry; |
45893984 | 4634 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4635 | |
4636 | rcu_read_lock(); | |
4637 | ||
4638 | /* Lookup application. If not found, there is a code flow error. */ | |
4639 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4640 | if (!app) { |
4641 | DBG("Application socket %d is being teardown. Abort event notify", | |
4642 | sock); | |
4643 | ret = 0; | |
d5d629b5 | 4644 | free(fields); |
d88aee68 DG |
4645 | goto error_rcu_unlock; |
4646 | } | |
d0b96690 | 4647 | |
4950b860 | 4648 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4649 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4650 | if (!ua_chan) { |
4651 | DBG("Application channel is being teardown. Abort event notify"); | |
4652 | ret = 0; | |
d5d629b5 | 4653 | free(fields); |
4950b860 MD |
4654 | goto error_rcu_unlock; |
4655 | } | |
4656 | ||
d0b96690 DG |
4657 | assert(ua_chan->session); |
4658 | ua_sess = ua_chan->session; | |
d0b96690 | 4659 | |
7972aab2 DG |
4660 | /* Get right session registry depending on the session buffer type. */ |
4661 | registry = get_session_registry(ua_sess); | |
4662 | assert(registry); | |
45893984 | 4663 | |
7972aab2 DG |
4664 | /* Depending on the buffer type, a different channel key is used. */ |
4665 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4666 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4667 | } else { |
7972aab2 | 4668 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4669 | } |
4670 | ||
7972aab2 DG |
4671 | pthread_mutex_lock(®istry->lock); |
4672 | ||
4673 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4674 | assert(chan_reg); | |
4675 | ||
4676 | if (!chan_reg->register_done) { | |
4677 | reg_count = ust_registry_get_event_count(chan_reg); | |
4678 | if (reg_count < 31) { | |
4679 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4680 | } else { | |
4681 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4682 | } | |
4683 | ||
4684 | chan_reg->nr_ctx_fields = nr_fields; | |
4685 | chan_reg->ctx_fields = fields; | |
4686 | chan_reg->header_type = type; | |
d0b96690 | 4687 | } else { |
7972aab2 DG |
4688 | /* Get current already assigned values. */ |
4689 | type = chan_reg->header_type; | |
d5d629b5 DG |
4690 | free(fields); |
4691 | /* Set to NULL so the error path does not do a double free. */ | |
4692 | fields = NULL; | |
d0b96690 | 4693 | } |
7972aab2 DG |
4694 | /* Channel id is set during the object creation. */ |
4695 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4696 | |
4697 | /* Append to metadata */ | |
7972aab2 DG |
4698 | if (!chan_reg->metadata_dumped) { |
4699 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4700 | if (ret_code) { |
4701 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4702 | goto reply; | |
4703 | } | |
4704 | } | |
4705 | ||
4706 | reply: | |
7972aab2 DG |
4707 | DBG3("UST app replying to register channel key %" PRIu64 |
4708 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4709 | ret_code); | |
d0b96690 DG |
4710 | |
4711 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4712 | if (ret < 0) { | |
4713 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4714 | ERR("UST app reply channel failed with ret %d", ret); | |
4715 | } else { | |
4716 | DBG3("UST app reply channel failed. Application died"); | |
4717 | } | |
4718 | goto error; | |
4719 | } | |
4720 | ||
7972aab2 DG |
4721 | /* This channel registry registration is completed. */ |
4722 | chan_reg->register_done = 1; | |
4723 | ||
d0b96690 | 4724 | error: |
7972aab2 | 4725 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4726 | error_rcu_unlock: |
d0b96690 | 4727 | rcu_read_unlock(); |
d5d629b5 DG |
4728 | if (ret) { |
4729 | free(fields); | |
4730 | } | |
d0b96690 DG |
4731 | return ret; |
4732 | } | |
4733 | ||
d88aee68 DG |
4734 | /* |
4735 | * Add event to the UST channel registry. When the event is added to the | |
4736 | * registry, the metadata is also created. Once done, this replies to the | |
4737 | * application with the appropriate error code. | |
4738 | * | |
4739 | * The session UST registry lock is acquired in the function. | |
4740 | * | |
4741 | * On success 0 is returned else a negative value. | |
4742 | */ | |
d0b96690 DG |
4743 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4744 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4745 | char *model_emf_uri) | |
4746 | { | |
4747 | int ret, ret_code; | |
4748 | uint32_t event_id = 0; | |
7972aab2 | 4749 | uint64_t chan_reg_key; |
d0b96690 DG |
4750 | struct ust_app *app; |
4751 | struct ust_app_channel *ua_chan; | |
4752 | struct ust_app_session *ua_sess; | |
7972aab2 | 4753 | struct ust_registry_session *registry; |
d0b96690 DG |
4754 | |
4755 | rcu_read_lock(); | |
4756 | ||
4757 | /* Lookup application. If not found, there is a code flow error. */ | |
4758 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4759 | if (!app) { |
4760 | DBG("Application socket %d is being teardown. Abort event notify", | |
4761 | sock); | |
4762 | ret = 0; | |
d5d629b5 DG |
4763 | free(sig); |
4764 | free(fields); | |
4765 | free(model_emf_uri); | |
d88aee68 DG |
4766 | goto error_rcu_unlock; |
4767 | } | |
d0b96690 | 4768 | |
4950b860 | 4769 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4770 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4771 | if (!ua_chan) { |
4772 | DBG("Application channel is being teardown. Abort event notify"); | |
4773 | ret = 0; | |
d5d629b5 DG |
4774 | free(sig); |
4775 | free(fields); | |
4776 | free(model_emf_uri); | |
4950b860 MD |
4777 | goto error_rcu_unlock; |
4778 | } | |
4779 | ||
d0b96690 DG |
4780 | assert(ua_chan->session); |
4781 | ua_sess = ua_chan->session; | |
4782 | ||
7972aab2 DG |
4783 | registry = get_session_registry(ua_sess); |
4784 | assert(registry); | |
4785 | ||
4786 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4787 | chan_reg_key = ua_chan->tracing_channel_id; | |
4788 | } else { | |
4789 | chan_reg_key = ua_chan->key; | |
4790 | } | |
4791 | ||
4792 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4793 | |
d5d629b5 DG |
4794 | /* |
4795 | * From this point on, this call acquires the ownership of the sig, fields | |
4796 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4797 | * three variables MUST NOT be read/write after this. | |
4798 | */ | |
7972aab2 | 4799 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4800 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
8494bda5 MD |
4801 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4802 | app); | |
d0b96690 DG |
4803 | |
4804 | /* | |
4805 | * The return value is returned to ustctl so in case of an error, the | |
4806 | * application can be notified. In case of an error, it's important not to | |
4807 | * return a negative error or else the application will get closed. | |
4808 | */ | |
4809 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4810 | if (ret < 0) { | |
4811 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4812 | ERR("UST app reply event failed with ret %d", ret); | |
4813 | } else { | |
4814 | DBG3("UST app reply event failed. Application died"); | |
4815 | } | |
4816 | /* | |
4817 | * No need to wipe the create event since the application socket will | |
4818 | * get close on error hence cleaning up everything by itself. | |
4819 | */ | |
4820 | goto error; | |
4821 | } | |
4822 | ||
7972aab2 DG |
4823 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4824 | name, event_id); | |
d88aee68 | 4825 | |
d0b96690 | 4826 | error: |
7972aab2 | 4827 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4828 | error_rcu_unlock: |
d0b96690 DG |
4829 | rcu_read_unlock(); |
4830 | return ret; | |
4831 | } | |
4832 | ||
d88aee68 DG |
4833 | /* |
4834 | * Handle application notification through the given notify socket. | |
4835 | * | |
4836 | * Return 0 on success or else a negative value. | |
4837 | */ | |
d0b96690 DG |
4838 | int ust_app_recv_notify(int sock) |
4839 | { | |
4840 | int ret; | |
4841 | enum ustctl_notify_cmd cmd; | |
4842 | ||
4843 | DBG3("UST app receiving notify from sock %d", sock); | |
4844 | ||
4845 | ret = ustctl_recv_notify(sock, &cmd); | |
4846 | if (ret < 0) { | |
4847 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4848 | ERR("UST app recv notify failed with ret %d", ret); | |
4849 | } else { | |
4850 | DBG3("UST app recv notify failed. Application died"); | |
4851 | } | |
4852 | goto error; | |
4853 | } | |
4854 | ||
4855 | switch (cmd) { | |
4856 | case USTCTL_NOTIFY_CMD_EVENT: | |
4857 | { | |
4858 | int sobjd, cobjd, loglevel; | |
4859 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4860 | size_t nr_fields; | |
4861 | struct ustctl_field *fields; | |
4862 | ||
4863 | DBG2("UST app ustctl register event received"); | |
4864 | ||
4865 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4866 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4867 | if (ret < 0) { | |
4868 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4869 | ERR("UST app recv event failed with ret %d", ret); | |
4870 | } else { | |
4871 | DBG3("UST app recv event failed. Application died"); | |
4872 | } | |
4873 | goto error; | |
4874 | } | |
4875 | ||
d5d629b5 DG |
4876 | /* |
4877 | * Add event to the UST registry coming from the notify socket. This | |
4878 | * call will free if needed the sig, fields and model_emf_uri. This | |
4879 | * code path loses the ownsership of these variables and transfer them | |
4880 | * to the this function. | |
4881 | */ | |
d0b96690 DG |
4882 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4883 | fields, loglevel, model_emf_uri); | |
4884 | if (ret < 0) { | |
4885 | goto error; | |
4886 | } | |
4887 | ||
4888 | break; | |
4889 | } | |
4890 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4891 | { | |
4892 | int sobjd, cobjd; | |
4893 | size_t nr_fields; | |
4894 | struct ustctl_field *fields; | |
4895 | ||
4896 | DBG2("UST app ustctl register channel received"); | |
4897 | ||
4898 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4899 | &fields); | |
4900 | if (ret < 0) { | |
4901 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4902 | ERR("UST app recv channel failed with ret %d", ret); | |
4903 | } else { | |
4904 | DBG3("UST app recv channel failed. Application died"); | |
4905 | } | |
4906 | goto error; | |
4907 | } | |
4908 | ||
d5d629b5 DG |
4909 | /* |
4910 | * The fields ownership are transfered to this function call meaning | |
4911 | * that if needed it will be freed. After this, it's invalid to access | |
4912 | * fields or clean it up. | |
4913 | */ | |
d0b96690 DG |
4914 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4915 | fields); | |
4916 | if (ret < 0) { | |
4917 | goto error; | |
4918 | } | |
4919 | ||
4920 | break; | |
4921 | } | |
4922 | default: | |
4923 | /* Should NEVER happen. */ | |
4924 | assert(0); | |
4925 | } | |
4926 | ||
4927 | error: | |
4928 | return ret; | |
4929 | } | |
d88aee68 DG |
4930 | |
4931 | /* | |
4932 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4933 | * corresponding application. On failure, the call_rcu to close the socket is | |
4934 | * executed. If an application is found, it tries to delete it from the notify | |
4935 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4936 | * | |
4937 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4938 | * call RCU is not done but the rest of the cleanup is. | |
4939 | */ | |
4940 | void ust_app_notify_sock_unregister(int sock) | |
4941 | { | |
4942 | int err_enomem = 0; | |
4943 | struct lttng_ht_iter iter; | |
4944 | struct ust_app *app; | |
4945 | struct ust_app_notify_sock_obj *obj; | |
4946 | ||
4947 | assert(sock >= 0); | |
4948 | ||
4949 | rcu_read_lock(); | |
4950 | ||
4951 | obj = zmalloc(sizeof(*obj)); | |
4952 | if (!obj) { | |
4953 | /* | |
4954 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4955 | * procedure but the call_rcu will not be called. In this case, we | |
4956 | * accept the fd leak rather than possibly creating an unsynchronized | |
4957 | * state between threads. | |
4958 | * | |
4959 | * TODO: The notify object should be created once the notify socket is | |
4960 | * registered and stored independantely from the ust app object. The | |
4961 | * tricky part is to synchronize the teardown of the application and | |
4962 | * this notify object. Let's keep that in mind so we can avoid this | |
4963 | * kind of shenanigans with ENOMEM in the teardown path. | |
4964 | */ | |
4965 | err_enomem = 1; | |
4966 | } else { | |
4967 | obj->fd = sock; | |
4968 | } | |
4969 | ||
4970 | DBG("UST app notify socket unregister %d", sock); | |
4971 | ||
4972 | /* | |
4973 | * Lookup application by notify socket. If this fails, this means that the | |
4974 | * hash table delete has already been done by the application | |
4975 | * unregistration process so we can safely close the notify socket in a | |
4976 | * call RCU. | |
4977 | */ | |
4978 | app = find_app_by_notify_sock(sock); | |
4979 | if (!app) { | |
4980 | goto close_socket; | |
4981 | } | |
4982 | ||
4983 | iter.iter.node = &app->notify_sock_n.node; | |
4984 | ||
4985 | /* | |
4986 | * Whatever happens here either we fail or succeed, in both cases we have | |
4987 | * to close the socket after a grace period to continue to the call RCU | |
4988 | * here. If the deletion is successful, the application is not visible | |
4989 | * anymore by other threads and is it fails it means that it was already | |
4990 | * deleted from the hash table so either way we just have to close the | |
4991 | * socket. | |
4992 | */ | |
4993 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4994 | ||
4995 | close_socket: | |
4996 | rcu_read_unlock(); | |
4997 | ||
4998 | /* | |
4999 | * Close socket after a grace period to avoid for the socket to be reused | |
5000 | * before the application object is freed creating potential race between | |
5001 | * threads trying to add unique in the global hash table. | |
5002 | */ | |
5003 | if (!err_enomem) { | |
5004 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5005 | } | |
5006 | } | |
f45e313d DG |
5007 | |
5008 | /* | |
5009 | * Destroy a ust app data structure and free its memory. | |
5010 | */ | |
5011 | void ust_app_destroy(struct ust_app *app) | |
5012 | { | |
5013 | if (!app) { | |
5014 | return; | |
5015 | } | |
5016 | ||
5017 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5018 | } | |
6dc3064a DG |
5019 | |
5020 | /* | |
5021 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5022 | * output. | |
5023 | * | |
5024 | * Return 0 on success or else a negative value. | |
5025 | */ | |
5026 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
65b95a7f | 5027 | struct snapshot_output *output, int wait, uint64_t max_stream_size) |
6dc3064a DG |
5028 | { |
5029 | int ret = 0; | |
7badf927 | 5030 | unsigned int snapshot_done = 0; |
6dc3064a DG |
5031 | struct lttng_ht_iter iter; |
5032 | struct ust_app *app; | |
af706bb7 | 5033 | char pathname[PATH_MAX]; |
6dc3064a DG |
5034 | |
5035 | assert(usess); | |
5036 | assert(output); | |
5037 | ||
5038 | rcu_read_lock(); | |
5039 | ||
8c924c7b MD |
5040 | switch (usess->buffer_type) { |
5041 | case LTTNG_BUFFER_PER_UID: | |
5042 | { | |
5043 | struct buffer_reg_uid *reg; | |
6dc3064a | 5044 | |
8c924c7b MD |
5045 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5046 | struct buffer_reg_channel *reg_chan; | |
5047 | struct consumer_socket *socket; | |
6dc3064a | 5048 | |
8c924c7b MD |
5049 | /* Get consumer socket to use to push the metadata.*/ |
5050 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5051 | usess->consumer); | |
5052 | if (!socket) { | |
5053 | ret = -EINVAL; | |
5054 | goto error; | |
5055 | } | |
6dc3064a | 5056 | |
8c924c7b MD |
5057 | memset(pathname, 0, sizeof(pathname)); |
5058 | ret = snprintf(pathname, sizeof(pathname), | |
5059 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5060 | reg->uid, reg->bits_per_long); | |
5061 | if (ret < 0) { | |
5062 | PERROR("snprintf snapshot path"); | |
5063 | goto error; | |
5064 | } | |
5065 | ||
5066 | /* Add the UST default trace dir to path. */ | |
5067 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5068 | reg_chan, node.node) { | |
65b95a7f DG |
5069 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, |
5070 | output, 0, usess->uid, usess->gid, pathname, wait, | |
8c924c7b MD |
5071 | max_stream_size); |
5072 | if (ret < 0) { | |
5073 | goto error; | |
5074 | } | |
5075 | } | |
65b95a7f DG |
5076 | ret = consumer_snapshot_channel(socket, |
5077 | reg->registry->reg.ust->metadata_key, output, 1, | |
5078 | usess->uid, usess->gid, pathname, wait, max_stream_size); | |
8c924c7b MD |
5079 | if (ret < 0) { |
5080 | goto error; | |
5081 | } | |
7badf927 | 5082 | snapshot_done = 1; |
af706bb7 | 5083 | } |
8c924c7b MD |
5084 | break; |
5085 | } | |
5086 | case LTTNG_BUFFER_PER_PID: | |
5087 | { | |
5088 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5089 | struct consumer_socket *socket; | |
5090 | struct lttng_ht_iter chan_iter; | |
5091 | struct ust_app_channel *ua_chan; | |
5092 | struct ust_app_session *ua_sess; | |
5093 | struct ust_registry_session *registry; | |
5094 | ||
5095 | ua_sess = lookup_session_by_app(usess, app); | |
5096 | if (!ua_sess) { | |
5097 | /* Session not associated with this app. */ | |
5098 | continue; | |
5099 | } | |
af706bb7 | 5100 | |
8c924c7b MD |
5101 | /* Get the right consumer socket for the application. */ |
5102 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5103 | output->consumer); | |
5104 | if (!socket) { | |
5c786ded | 5105 | ret = -EINVAL; |
5c786ded JD |
5106 | goto error; |
5107 | } | |
5108 | ||
8c924c7b MD |
5109 | /* Add the UST default trace dir to path. */ |
5110 | memset(pathname, 0, sizeof(pathname)); | |
5111 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5112 | ua_sess->path); | |
6dc3064a | 5113 | if (ret < 0) { |
8c924c7b | 5114 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5115 | goto error; |
5116 | } | |
6dc3064a | 5117 | |
8c924c7b MD |
5118 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5119 | ua_chan, node.node) { | |
65b95a7f DG |
5120 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, |
5121 | 0, ua_sess->euid, ua_sess->egid, pathname, wait, | |
8c924c7b MD |
5122 | max_stream_size); |
5123 | if (ret < 0) { | |
5124 | goto error; | |
5125 | } | |
5126 | } | |
5127 | ||
5128 | registry = get_session_registry(ua_sess); | |
5129 | assert(registry); | |
5130 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
5131 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, | |
5132 | max_stream_size); | |
5133 | if (ret < 0) { | |
5134 | goto error; | |
5135 | } | |
7badf927 | 5136 | snapshot_done = 1; |
8c924c7b MD |
5137 | } |
5138 | break; | |
5139 | } | |
5140 | default: | |
5141 | assert(0); | |
5142 | break; | |
6dc3064a DG |
5143 | } |
5144 | ||
7badf927 DG |
5145 | if (!snapshot_done) { |
5146 | /* | |
5147 | * If no snapshot was made and we are not in the error path, this means | |
5148 | * that there are no buffers thus no (prior) application to snapshot | |
5149 | * data from so we have simply NO data. | |
5150 | */ | |
5151 | ret = -ENODATA; | |
5152 | } | |
5153 | ||
6dc3064a DG |
5154 | error: |
5155 | rcu_read_unlock(); | |
5156 | return ret; | |
5157 | } | |
5c786ded JD |
5158 | |
5159 | /* | |
5160 | * Return the number of streams for a UST session. | |
5161 | */ | |
5162 | unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess) | |
5163 | { | |
5164 | unsigned int ret = 0; | |
5165 | struct ust_app *app; | |
5166 | struct lttng_ht_iter iter; | |
5167 | ||
5168 | assert(usess); | |
5169 | ||
5170 | switch (usess->buffer_type) { | |
5171 | case LTTNG_BUFFER_PER_UID: | |
5172 | { | |
5173 | struct buffer_reg_uid *reg; | |
5174 | ||
5175 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5176 | struct buffer_reg_channel *reg_chan; | |
5177 | ||
21644f95 | 5178 | rcu_read_lock(); |
5c786ded JD |
5179 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5180 | reg_chan, node.node) { | |
5181 | ret += reg_chan->stream_count; | |
5182 | } | |
21644f95 | 5183 | rcu_read_unlock(); |
5c786ded JD |
5184 | } |
5185 | break; | |
5186 | } | |
5187 | case LTTNG_BUFFER_PER_PID: | |
5188 | { | |
5189 | rcu_read_lock(); | |
5190 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5191 | struct ust_app_channel *ua_chan; | |
5192 | struct ust_app_session *ua_sess; | |
5193 | struct lttng_ht_iter chan_iter; | |
5194 | ||
5195 | ua_sess = lookup_session_by_app(usess, app); | |
5196 | if (!ua_sess) { | |
5197 | /* Session not associated with this app. */ | |
5198 | continue; | |
5199 | } | |
5200 | ||
5201 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5202 | ua_chan, node.node) { | |
5203 | ret += ua_chan->streams.count; | |
5204 | } | |
5205 | } | |
5206 | rcu_read_unlock(); | |
5207 | break; | |
5208 | } | |
5209 | default: | |
5210 | assert(0); | |
5211 | break; | |
5212 | } | |
5213 | ||
5214 | return ret; | |
5215 | } |