Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
91d76f53 DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
16 | */ |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <errno.h> | |
7972aab2 | 20 | #include <inttypes.h> |
91d76f53 DG |
21 | #include <pthread.h> |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
099e26bd | 24 | #include <string.h> |
aba8e916 DG |
25 | #include <sys/stat.h> |
26 | #include <sys/types.h> | |
099e26bd | 27 | #include <unistd.h> |
0df502fd | 28 | #include <urcu/compiler.h> |
fb54cdbf | 29 | #include <lttng/ust-error.h> |
331744e3 | 30 | #include <signal.h> |
bec39940 | 31 | |
990570ed | 32 | #include <common/common.h> |
86acf0da | 33 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 34 | |
7972aab2 | 35 | #include "buffer-registry.h" |
86acf0da | 36 | #include "fd-limit.h" |
8782cc74 | 37 | #include "health-sessiond.h" |
56fff090 | 38 | #include "ust-app.h" |
48842b30 | 39 | #include "ust-consumer.h" |
d80a6244 | 40 | #include "ust-ctl.h" |
0b2dc8df | 41 | #include "utils.h" |
d80a6244 | 42 | |
d9bf3ca4 MD |
43 | /* Next available channel key. Access under next_channel_key_lock. */ |
44 | static uint64_t _next_channel_key; | |
45 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
46 | ||
47 | /* Next available session ID. Access under next_session_id_lock. */ | |
48 | static uint64_t _next_session_id; | |
49 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
50 | |
51 | /* | |
d9bf3ca4 | 52 | * Return the incremented value of next_channel_key. |
ffe60014 | 53 | */ |
d9bf3ca4 | 54 | static uint64_t get_next_channel_key(void) |
ffe60014 | 55 | { |
d9bf3ca4 MD |
56 | uint64_t ret; |
57 | ||
58 | pthread_mutex_lock(&next_channel_key_lock); | |
59 | ret = ++_next_channel_key; | |
60 | pthread_mutex_unlock(&next_channel_key_lock); | |
61 | return ret; | |
ffe60014 DG |
62 | } |
63 | ||
64 | /* | |
7972aab2 | 65 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 66 | */ |
d9bf3ca4 | 67 | static uint64_t get_next_session_id(void) |
ffe60014 | 68 | { |
d9bf3ca4 MD |
69 | uint64_t ret; |
70 | ||
71 | pthread_mutex_lock(&next_session_id_lock); | |
72 | ret = ++_next_session_id; | |
73 | pthread_mutex_unlock(&next_session_id_lock); | |
74 | return ret; | |
ffe60014 DG |
75 | } |
76 | ||
d65d2de8 DG |
77 | static void copy_channel_attr_to_ustctl( |
78 | struct ustctl_consumer_channel_attr *attr, | |
79 | struct lttng_ust_channel_attr *uattr) | |
80 | { | |
81 | /* Copy event attributes since the layout is different. */ | |
82 | attr->subbuf_size = uattr->subbuf_size; | |
83 | attr->num_subbuf = uattr->num_subbuf; | |
84 | attr->overwrite = uattr->overwrite; | |
85 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
86 | attr->read_timer_interval = uattr->read_timer_interval; | |
87 | attr->output = uattr->output; | |
88 | } | |
89 | ||
025faf73 DG |
90 | /* |
91 | * Match function for the hash table lookup. | |
92 | * | |
93 | * It matches an ust app event based on three attributes which are the event | |
94 | * name, the filter bytecode and the loglevel. | |
95 | */ | |
18eace3b DG |
96 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
97 | { | |
98 | struct ust_app_event *event; | |
99 | const struct ust_app_ht_key *key; | |
100 | ||
101 | assert(node); | |
102 | assert(_key); | |
103 | ||
104 | event = caa_container_of(node, struct ust_app_event, node.node); | |
105 | key = _key; | |
106 | ||
1af53eb5 | 107 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
108 | |
109 | /* Event name */ | |
110 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
111 | goto no_match; | |
112 | } | |
113 | ||
114 | /* Event loglevel. */ | |
115 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
116 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
117 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
118 | /* | |
119 | * Match is accepted. This is because on event creation, the | |
120 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
121 | * -1 are accepted for this loglevel type since 0 is the one set by | |
122 | * the API when receiving an enable event. | |
123 | */ | |
124 | } else { | |
125 | goto no_match; | |
126 | } | |
18eace3b DG |
127 | } |
128 | ||
129 | /* One of the filters is NULL, fail. */ | |
130 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
131 | goto no_match; | |
132 | } | |
133 | ||
025faf73 DG |
134 | if (key->filter && event->filter) { |
135 | /* Both filters exists, check length followed by the bytecode. */ | |
136 | if (event->filter->len != key->filter->len || | |
137 | memcmp(event->filter->data, key->filter->data, | |
138 | event->filter->len) != 0) { | |
139 | goto no_match; | |
140 | } | |
18eace3b DG |
141 | } |
142 | ||
1af53eb5 JI |
143 | /* One of the exclusions is NULL, fail. */ |
144 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
145 | goto no_match; | |
146 | } | |
147 | ||
148 | if (key->exclusion && event->exclusion) { | |
149 | /* Both exclusions exists, check count followed by the names. */ | |
150 | if (event->exclusion->count != key->exclusion->count || | |
151 | memcmp(event->exclusion->names, key->exclusion->names, | |
152 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
153 | goto no_match; | |
154 | } | |
155 | } | |
156 | ||
157 | ||
025faf73 | 158 | /* Match. */ |
18eace3b DG |
159 | return 1; |
160 | ||
161 | no_match: | |
162 | return 0; | |
18eace3b DG |
163 | } |
164 | ||
025faf73 DG |
165 | /* |
166 | * Unique add of an ust app event in the given ht. This uses the custom | |
167 | * ht_match_ust_app_event match function and the event name as hash. | |
168 | */ | |
d0b96690 | 169 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
170 | struct ust_app_event *event) |
171 | { | |
172 | struct cds_lfht_node *node_ptr; | |
173 | struct ust_app_ht_key key; | |
d0b96690 | 174 | struct lttng_ht *ht; |
18eace3b | 175 | |
d0b96690 DG |
176 | assert(ua_chan); |
177 | assert(ua_chan->events); | |
18eace3b DG |
178 | assert(event); |
179 | ||
d0b96690 | 180 | ht = ua_chan->events; |
18eace3b DG |
181 | key.name = event->attr.name; |
182 | key.filter = event->filter; | |
183 | key.loglevel = event->attr.loglevel; | |
91c89f23 | 184 | key.exclusion = event->exclusion; |
18eace3b DG |
185 | |
186 | node_ptr = cds_lfht_add_unique(ht->ht, | |
187 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
188 | ht_match_ust_app_event, &key, &event->node.node); | |
189 | assert(node_ptr == &event->node.node); | |
190 | } | |
191 | ||
d88aee68 DG |
192 | /* |
193 | * Close the notify socket from the given RCU head object. This MUST be called | |
194 | * through a call_rcu(). | |
195 | */ | |
196 | static void close_notify_sock_rcu(struct rcu_head *head) | |
197 | { | |
198 | int ret; | |
199 | struct ust_app_notify_sock_obj *obj = | |
200 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
201 | ||
202 | /* Must have a valid fd here. */ | |
203 | assert(obj->fd >= 0); | |
204 | ||
205 | ret = close(obj->fd); | |
206 | if (ret) { | |
207 | ERR("close notify sock %d RCU", obj->fd); | |
208 | } | |
209 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
210 | ||
211 | free(obj); | |
212 | } | |
213 | ||
7972aab2 DG |
214 | /* |
215 | * Return the session registry according to the buffer type of the given | |
216 | * session. | |
217 | * | |
218 | * A registry per UID object MUST exists before calling this function or else | |
219 | * it assert() if not found. RCU read side lock must be acquired. | |
220 | */ | |
221 | static struct ust_registry_session *get_session_registry( | |
222 | struct ust_app_session *ua_sess) | |
223 | { | |
224 | struct ust_registry_session *registry = NULL; | |
225 | ||
226 | assert(ua_sess); | |
227 | ||
228 | switch (ua_sess->buffer_type) { | |
229 | case LTTNG_BUFFER_PER_PID: | |
230 | { | |
231 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
232 | if (!reg_pid) { | |
233 | goto error; | |
234 | } | |
235 | registry = reg_pid->registry->reg.ust; | |
236 | break; | |
237 | } | |
238 | case LTTNG_BUFFER_PER_UID: | |
239 | { | |
240 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
241 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
242 | if (!reg_uid) { | |
243 | goto error; | |
244 | } | |
245 | registry = reg_uid->registry->reg.ust; | |
246 | break; | |
247 | } | |
248 | default: | |
249 | assert(0); | |
250 | }; | |
251 | ||
252 | error: | |
253 | return registry; | |
254 | } | |
255 | ||
55cc08a6 DG |
256 | /* |
257 | * Delete ust context safely. RCU read lock must be held before calling | |
258 | * this function. | |
259 | */ | |
260 | static | |
261 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
262 | { | |
ffe60014 DG |
263 | int ret; |
264 | ||
265 | assert(ua_ctx); | |
266 | ||
55cc08a6 | 267 | if (ua_ctx->obj) { |
ffe60014 | 268 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
269 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
270 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
271 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 272 | } |
55cc08a6 DG |
273 | free(ua_ctx->obj); |
274 | } | |
275 | free(ua_ctx); | |
276 | } | |
277 | ||
d80a6244 DG |
278 | /* |
279 | * Delete ust app event safely. RCU read lock must be held before calling | |
280 | * this function. | |
281 | */ | |
8b366481 DG |
282 | static |
283 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 284 | { |
ffe60014 DG |
285 | int ret; |
286 | ||
287 | assert(ua_event); | |
288 | ||
53a80697 | 289 | free(ua_event->filter); |
951f0b71 JI |
290 | if (ua_event->exclusion != NULL) |
291 | free(ua_event->exclusion); | |
edb67388 | 292 | if (ua_event->obj != NULL) { |
ffe60014 DG |
293 | ret = ustctl_release_object(sock, ua_event->obj); |
294 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
295 | ERR("UST app sock %d release event obj failed with ret %d", | |
296 | sock, ret); | |
297 | } | |
edb67388 DG |
298 | free(ua_event->obj); |
299 | } | |
d80a6244 DG |
300 | free(ua_event); |
301 | } | |
302 | ||
303 | /* | |
7972aab2 DG |
304 | * Release ust data object of the given stream. |
305 | * | |
306 | * Return 0 on success or else a negative value. | |
d80a6244 | 307 | */ |
7972aab2 | 308 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 309 | { |
7972aab2 | 310 | int ret = 0; |
ffe60014 DG |
311 | |
312 | assert(stream); | |
313 | ||
8b366481 | 314 | if (stream->obj) { |
ffe60014 DG |
315 | ret = ustctl_release_object(sock, stream->obj); |
316 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
317 | ERR("UST app sock %d release stream obj failed with ret %d", | |
318 | sock, ret); | |
319 | } | |
4063050c | 320 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
321 | free(stream->obj); |
322 | } | |
7972aab2 DG |
323 | |
324 | return ret; | |
325 | } | |
326 | ||
327 | /* | |
328 | * Delete ust app stream safely. RCU read lock must be held before calling | |
329 | * this function. | |
330 | */ | |
331 | static | |
332 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
333 | { | |
334 | assert(stream); | |
335 | ||
336 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 337 | free(stream); |
d80a6244 DG |
338 | } |
339 | ||
36b588ed MD |
340 | /* |
341 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
342 | * section and outside of call_rcu thread, so we postpone its execution |
343 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
344 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
345 | */ |
346 | static | |
347 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
348 | { | |
349 | struct ust_app_channel *ua_chan = | |
350 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
351 | ||
0b2dc8df MD |
352 | ht_cleanup_push(ua_chan->ctx); |
353 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
354 | free(ua_chan); |
355 | } | |
356 | ||
d80a6244 DG |
357 | /* |
358 | * Delete ust app channel safely. RCU read lock must be held before calling | |
359 | * this function. | |
360 | */ | |
8b366481 | 361 | static |
d0b96690 DG |
362 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
363 | struct ust_app *app) | |
d80a6244 DG |
364 | { |
365 | int ret; | |
bec39940 | 366 | struct lttng_ht_iter iter; |
d80a6244 | 367 | struct ust_app_event *ua_event; |
55cc08a6 | 368 | struct ust_app_ctx *ua_ctx; |
030a66fa | 369 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 370 | struct ust_registry_session *registry; |
d80a6244 | 371 | |
ffe60014 DG |
372 | assert(ua_chan); |
373 | ||
374 | DBG3("UST app deleting channel %s", ua_chan->name); | |
375 | ||
55cc08a6 | 376 | /* Wipe stream */ |
d80a6244 | 377 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 378 | cds_list_del(&stream->list); |
d80a6244 DG |
379 | delete_ust_app_stream(sock, stream); |
380 | } | |
381 | ||
55cc08a6 | 382 | /* Wipe context */ |
bec39940 | 383 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 384 | cds_list_del(&ua_ctx->list); |
bec39940 | 385 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 DG |
386 | assert(!ret); |
387 | delete_ust_app_ctx(sock, ua_ctx); | |
388 | } | |
d80a6244 | 389 | |
55cc08a6 | 390 | /* Wipe events */ |
bec39940 DG |
391 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
392 | node.node) { | |
393 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 394 | assert(!ret); |
d80a6244 DG |
395 | delete_ust_app_event(sock, ua_event); |
396 | } | |
edb67388 | 397 | |
c8335706 MD |
398 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
399 | /* Wipe and free registry from session registry. */ | |
400 | registry = get_session_registry(ua_chan->session); | |
401 | if (registry) { | |
402 | ust_registry_channel_del_free(registry, ua_chan->key); | |
403 | } | |
7972aab2 | 404 | } |
d0b96690 | 405 | |
edb67388 | 406 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
407 | /* Remove channel from application UST object descriptor. */ |
408 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
409 | lttng_ht_del(app->ust_objd, &iter); | |
ffe60014 DG |
410 | ret = ustctl_release_object(sock, ua_chan->obj); |
411 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
412 | ERR("UST app sock %d release channel obj failed with ret %d", | |
413 | sock, ret); | |
414 | } | |
7972aab2 | 415 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
416 | free(ua_chan->obj); |
417 | } | |
36b588ed | 418 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
419 | } |
420 | ||
331744e3 | 421 | /* |
1b532a60 DG |
422 | * Push metadata to consumer socket. |
423 | * | |
424 | * The socket lock MUST be acquired. | |
425 | * The ust app session lock MUST be acquired. | |
331744e3 JD |
426 | * |
427 | * On success, return the len of metadata pushed or else a negative value. | |
428 | */ | |
429 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
430 | struct consumer_socket *socket, int send_zero_data) | |
431 | { | |
432 | int ret; | |
433 | char *metadata_str = NULL; | |
434 | size_t len, offset; | |
435 | ssize_t ret_val; | |
436 | ||
437 | assert(registry); | |
438 | assert(socket); | |
1b532a60 DG |
439 | |
440 | /* | |
441 | * On a push metadata error either the consumer is dead or the metadata | |
442 | * channel has been destroyed because its endpoint might have died (e.g: | |
443 | * relayd). If so, the metadata closed flag is set to 1 so we deny pushing | |
444 | * metadata again which is not valid anymore on the consumer side. | |
445 | * | |
446 | * The ust app session mutex locked allows us to make this check without | |
447 | * the registry lock. | |
448 | */ | |
449 | if (registry->metadata_closed) { | |
450 | return -EPIPE; | |
451 | } | |
331744e3 JD |
452 | |
453 | pthread_mutex_lock(®istry->lock); | |
454 | ||
455 | offset = registry->metadata_len_sent; | |
456 | len = registry->metadata_len - registry->metadata_len_sent; | |
457 | if (len == 0) { | |
458 | DBG3("No metadata to push for metadata key %" PRIu64, | |
459 | registry->metadata_key); | |
460 | ret_val = len; | |
461 | if (send_zero_data) { | |
462 | DBG("No metadata to push"); | |
463 | goto push_data; | |
464 | } | |
465 | goto end; | |
466 | } | |
467 | ||
468 | /* Allocate only what we have to send. */ | |
469 | metadata_str = zmalloc(len); | |
470 | if (!metadata_str) { | |
471 | PERROR("zmalloc ust app metadata string"); | |
472 | ret_val = -ENOMEM; | |
473 | goto error; | |
474 | } | |
475 | /* Copy what we haven't send out. */ | |
476 | memcpy(metadata_str, registry->metadata + offset, len); | |
477 | registry->metadata_len_sent += len; | |
478 | ||
479 | push_data: | |
480 | pthread_mutex_unlock(®istry->lock); | |
481 | ret = consumer_push_metadata(socket, registry->metadata_key, | |
482 | metadata_str, len, offset); | |
483 | if (ret < 0) { | |
484 | ret_val = ret; | |
485 | goto error_push; | |
486 | } | |
487 | ||
488 | free(metadata_str); | |
489 | return len; | |
490 | ||
491 | end: | |
492 | error: | |
493 | pthread_mutex_unlock(®istry->lock); | |
494 | error_push: | |
495 | free(metadata_str); | |
496 | return ret_val; | |
497 | } | |
498 | ||
d88aee68 DG |
499 | /* |
500 | * For a given application and session, push metadata to consumer. The session | |
501 | * lock MUST be acquired here before calling this. | |
331744e3 JD |
502 | * Either sock or consumer is required : if sock is NULL, the default |
503 | * socket to send the metadata is retrieved from consumer, if sock | |
504 | * is not NULL we use it to send the metadata. | |
d88aee68 DG |
505 | * |
506 | * Return 0 on success else a negative error. | |
507 | */ | |
7972aab2 DG |
508 | static int push_metadata(struct ust_registry_session *registry, |
509 | struct consumer_output *consumer) | |
d88aee68 | 510 | { |
331744e3 JD |
511 | int ret_val; |
512 | ssize_t ret; | |
d88aee68 DG |
513 | struct consumer_socket *socket; |
514 | ||
7972aab2 DG |
515 | assert(registry); |
516 | assert(consumer); | |
517 | ||
518 | rcu_read_lock(); | |
d88aee68 | 519 | |
7972aab2 DG |
520 | /* |
521 | * Means that no metadata was assigned to the session. This can happens if | |
522 | * no start has been done previously. | |
523 | */ | |
524 | if (!registry->metadata_key) { | |
331744e3 | 525 | ret_val = 0; |
1b532a60 | 526 | goto end_rcu_unlock; |
d88aee68 DG |
527 | } |
528 | ||
d88aee68 | 529 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
530 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
531 | consumer); | |
d88aee68 | 532 | if (!socket) { |
331744e3 | 533 | ret_val = -1; |
d88aee68 DG |
534 | goto error_rcu_unlock; |
535 | } | |
536 | ||
537 | /* | |
538 | * TODO: Currently, we hold the socket lock around sampling of the next | |
539 | * metadata segment to ensure we send metadata over the consumer socket in | |
540 | * the correct order. This makes the registry lock nest inside the socket | |
541 | * lock. | |
542 | * | |
543 | * Please note that this is a temporary measure: we should move this lock | |
544 | * back into ust_consumer_push_metadata() when the consumer gets the | |
545 | * ability to reorder the metadata it receives. | |
546 | */ | |
547 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
548 | ret = ust_app_push_metadata(registry, socket, 0); |
549 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 550 | if (ret < 0) { |
331744e3 | 551 | ret_val = ret; |
d88aee68 DG |
552 | goto error_rcu_unlock; |
553 | } | |
554 | ||
d88aee68 | 555 | rcu_read_unlock(); |
d88aee68 DG |
556 | return 0; |
557 | ||
d88aee68 | 558 | error_rcu_unlock: |
1b532a60 DG |
559 | /* |
560 | * On error, flag the registry that the metadata is closed. We were unable | |
561 | * to push anything and this means that either the consumer is not | |
562 | * responding or the metadata cache has been destroyed on the consumer. | |
563 | */ | |
564 | registry->metadata_closed = 1; | |
565 | end_rcu_unlock: | |
d88aee68 | 566 | rcu_read_unlock(); |
331744e3 | 567 | return ret_val; |
d88aee68 DG |
568 | } |
569 | ||
570 | /* | |
571 | * Send to the consumer a close metadata command for the given session. Once | |
572 | * done, the metadata channel is deleted and the session metadata pointer is | |
573 | * nullified. The session lock MUST be acquired here unless the application is | |
574 | * in the destroy path. | |
575 | * | |
576 | * Return 0 on success else a negative value. | |
577 | */ | |
7972aab2 DG |
578 | static int close_metadata(struct ust_registry_session *registry, |
579 | struct consumer_output *consumer) | |
d88aee68 DG |
580 | { |
581 | int ret; | |
582 | struct consumer_socket *socket; | |
583 | ||
7972aab2 DG |
584 | assert(registry); |
585 | assert(consumer); | |
d88aee68 | 586 | |
7972aab2 DG |
587 | rcu_read_lock(); |
588 | ||
589 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 | 590 | ret = 0; |
1b532a60 | 591 | goto end; |
d88aee68 DG |
592 | } |
593 | ||
d88aee68 | 594 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
595 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
596 | consumer); | |
d88aee68 DG |
597 | if (!socket) { |
598 | ret = -1; | |
7972aab2 | 599 | goto error; |
d88aee68 DG |
600 | } |
601 | ||
7972aab2 | 602 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 603 | if (ret < 0) { |
7972aab2 | 604 | goto error; |
d88aee68 DG |
605 | } |
606 | ||
d88aee68 | 607 | error: |
1b532a60 DG |
608 | /* |
609 | * Metadata closed. Even on error this means that the consumer is not | |
610 | * responding or not found so either way a second close should NOT be emit | |
611 | * for this registry. | |
612 | */ | |
613 | registry->metadata_closed = 1; | |
614 | end: | |
7972aab2 | 615 | rcu_read_unlock(); |
d88aee68 DG |
616 | return ret; |
617 | } | |
618 | ||
36b588ed MD |
619 | /* |
620 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
621 | * section and outside of call_rcu thread, so we postpone its execution |
622 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
623 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
624 | */ |
625 | static | |
626 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
627 | { | |
628 | struct ust_app_session *ua_sess = | |
629 | caa_container_of(head, struct ust_app_session, rcu_head); | |
630 | ||
0b2dc8df | 631 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
632 | free(ua_sess); |
633 | } | |
634 | ||
d80a6244 DG |
635 | /* |
636 | * Delete ust app session safely. RCU read lock must be held before calling | |
637 | * this function. | |
638 | */ | |
8b366481 | 639 | static |
d0b96690 DG |
640 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
641 | struct ust_app *app) | |
d80a6244 DG |
642 | { |
643 | int ret; | |
bec39940 | 644 | struct lttng_ht_iter iter; |
d80a6244 | 645 | struct ust_app_channel *ua_chan; |
7972aab2 | 646 | struct ust_registry_session *registry; |
d80a6244 | 647 | |
d88aee68 DG |
648 | assert(ua_sess); |
649 | ||
1b532a60 DG |
650 | pthread_mutex_lock(&ua_sess->lock); |
651 | ||
7972aab2 | 652 | registry = get_session_registry(ua_sess); |
1b532a60 | 653 | if (registry && !registry->metadata_closed) { |
d88aee68 | 654 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 655 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 656 | |
7972aab2 DG |
657 | /* |
658 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
659 | * metadata only on destroy trace session in this case. Also, the |
660 | * previous push metadata could have flag the metadata registry to | |
661 | * close so don't send a close command if closed. | |
7972aab2 | 662 | */ |
1b532a60 DG |
663 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
664 | !registry->metadata_closed) { | |
7972aab2 DG |
665 | /* And ask to close it for this session registry. */ |
666 | (void) close_metadata(registry, ua_sess->consumer); | |
667 | } | |
d80a6244 DG |
668 | } |
669 | ||
bec39940 DG |
670 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
671 | node.node) { | |
672 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 673 | assert(!ret); |
d0b96690 | 674 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 675 | } |
d80a6244 | 676 | |
7972aab2 DG |
677 | /* In case of per PID, the registry is kept in the session. */ |
678 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
679 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
680 | if (reg_pid) { | |
681 | buffer_reg_pid_remove(reg_pid); | |
682 | buffer_reg_pid_destroy(reg_pid); | |
683 | } | |
684 | } | |
d0b96690 | 685 | |
aee6bafd | 686 | if (ua_sess->handle != -1) { |
ffe60014 DG |
687 | ret = ustctl_release_handle(sock, ua_sess->handle); |
688 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
689 | ERR("UST app sock %d release session handle failed with ret %d", | |
690 | sock, ret); | |
691 | } | |
aee6bafd | 692 | } |
1b532a60 DG |
693 | pthread_mutex_unlock(&ua_sess->lock); |
694 | ||
36b588ed | 695 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 696 | } |
91d76f53 DG |
697 | |
698 | /* | |
284d8f55 DG |
699 | * Delete a traceable application structure from the global list. Never call |
700 | * this function outside of a call_rcu call. | |
36b588ed MD |
701 | * |
702 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 703 | */ |
8b366481 DG |
704 | static |
705 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 706 | { |
8b366481 | 707 | int ret, sock; |
d42f20df | 708 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 709 | |
d80a6244 | 710 | /* Delete ust app sessions info */ |
852d0037 DG |
711 | sock = app->sock; |
712 | app->sock = -1; | |
d80a6244 | 713 | |
8b366481 | 714 | /* Wipe sessions */ |
d42f20df DG |
715 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
716 | teardown_node) { | |
717 | /* Free every object in the session and the session. */ | |
36b588ed | 718 | rcu_read_lock(); |
d0b96690 | 719 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 720 | rcu_read_unlock(); |
d80a6244 | 721 | } |
36b588ed | 722 | |
0b2dc8df MD |
723 | ht_cleanup_push(app->sessions); |
724 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 725 | |
6414a713 | 726 | /* |
852d0037 DG |
727 | * Wait until we have deleted the application from the sock hash table |
728 | * before closing this socket, otherwise an application could re-use the | |
729 | * socket ID and race with the teardown, using the same hash table entry. | |
730 | * | |
731 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
732 | * all RCU readers that could run concurrently with unregister app, | |
733 | * therefore we _need_ to only close that socket after a grace period. So | |
734 | * it should stay in this RCU callback. | |
735 | * | |
736 | * This close() is a very important step of the synchronization model so | |
737 | * every modification to this function must be carefully reviewed. | |
6414a713 | 738 | */ |
799e2c4f MD |
739 | ret = close(sock); |
740 | if (ret) { | |
741 | PERROR("close"); | |
742 | } | |
4063050c | 743 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 744 | |
852d0037 | 745 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 746 | free(app); |
099e26bd DG |
747 | } |
748 | ||
749 | /* | |
f6a9efaa | 750 | * URCU intermediate call to delete an UST app. |
099e26bd | 751 | */ |
8b366481 DG |
752 | static |
753 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 754 | { |
bec39940 DG |
755 | struct lttng_ht_node_ulong *node = |
756 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 757 | struct ust_app *app = |
852d0037 | 758 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 759 | |
852d0037 | 760 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 761 | delete_ust_app(app); |
099e26bd DG |
762 | } |
763 | ||
ffe60014 DG |
764 | /* |
765 | * Delete the session from the application ht and delete the data structure by | |
766 | * freeing every object inside and releasing them. | |
767 | */ | |
d0b96690 | 768 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
769 | struct ust_app_session *ua_sess) |
770 | { | |
771 | int ret; | |
772 | struct lttng_ht_iter iter; | |
773 | ||
774 | assert(app); | |
775 | assert(ua_sess); | |
776 | ||
777 | iter.iter.node = &ua_sess->node.node; | |
778 | ret = lttng_ht_del(app->sessions, &iter); | |
779 | if (ret) { | |
780 | /* Already scheduled for teardown. */ | |
781 | goto end; | |
782 | } | |
783 | ||
784 | /* Once deleted, free the data structure. */ | |
d0b96690 | 785 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
786 | |
787 | end: | |
788 | return; | |
789 | } | |
790 | ||
8b366481 DG |
791 | /* |
792 | * Alloc new UST app session. | |
793 | */ | |
794 | static | |
d0b96690 | 795 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
796 | { |
797 | struct ust_app_session *ua_sess; | |
798 | ||
799 | /* Init most of the default value by allocating and zeroing */ | |
800 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
801 | if (ua_sess == NULL) { | |
802 | PERROR("malloc"); | |
ffe60014 | 803 | goto error_free; |
8b366481 DG |
804 | } |
805 | ||
806 | ua_sess->handle = -1; | |
bec39940 | 807 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
d0b96690 | 808 | pthread_mutex_init(&ua_sess->lock, NULL); |
ffe60014 | 809 | |
8b366481 DG |
810 | return ua_sess; |
811 | ||
ffe60014 | 812 | error_free: |
8b366481 DG |
813 | return NULL; |
814 | } | |
815 | ||
816 | /* | |
817 | * Alloc new UST app channel. | |
818 | */ | |
819 | static | |
820 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 821 | struct ust_app_session *ua_sess, |
ffe60014 | 822 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
823 | { |
824 | struct ust_app_channel *ua_chan; | |
825 | ||
826 | /* Init most of the default value by allocating and zeroing */ | |
827 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
828 | if (ua_chan == NULL) { | |
829 | PERROR("malloc"); | |
830 | goto error; | |
831 | } | |
832 | ||
833 | /* Setup channel name */ | |
834 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
835 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
836 | ||
837 | ua_chan->enabled = 1; | |
838 | ua_chan->handle = -1; | |
45893984 | 839 | ua_chan->session = ua_sess; |
ffe60014 | 840 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
841 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
842 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
843 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
844 | |
845 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 846 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
847 | |
848 | /* Copy attributes */ | |
849 | if (attr) { | |
ffe60014 | 850 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
851 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
852 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
853 | ua_chan->attr.overwrite = attr->overwrite; | |
854 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
855 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
856 | ua_chan->attr.output = attr->output; | |
8b366481 | 857 | } |
ffe60014 DG |
858 | /* By default, the channel is a per cpu channel. */ |
859 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
860 | |
861 | DBG3("UST app channel %s allocated", ua_chan->name); | |
862 | ||
863 | return ua_chan; | |
864 | ||
865 | error: | |
866 | return NULL; | |
867 | } | |
868 | ||
37f1c236 DG |
869 | /* |
870 | * Allocate and initialize a UST app stream. | |
871 | * | |
872 | * Return newly allocated stream pointer or NULL on error. | |
873 | */ | |
ffe60014 | 874 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
875 | { |
876 | struct ust_app_stream *stream = NULL; | |
877 | ||
878 | stream = zmalloc(sizeof(*stream)); | |
879 | if (stream == NULL) { | |
880 | PERROR("zmalloc ust app stream"); | |
881 | goto error; | |
882 | } | |
883 | ||
884 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
885 | stream->handle = -1; | |
886 | ||
887 | error: | |
888 | return stream; | |
889 | } | |
890 | ||
8b366481 DG |
891 | /* |
892 | * Alloc new UST app event. | |
893 | */ | |
894 | static | |
895 | struct ust_app_event *alloc_ust_app_event(char *name, | |
896 | struct lttng_ust_event *attr) | |
897 | { | |
898 | struct ust_app_event *ua_event; | |
899 | ||
900 | /* Init most of the default value by allocating and zeroing */ | |
901 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
902 | if (ua_event == NULL) { | |
903 | PERROR("malloc"); | |
904 | goto error; | |
905 | } | |
906 | ||
907 | ua_event->enabled = 1; | |
908 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
909 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 910 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
911 | |
912 | /* Copy attributes */ | |
913 | if (attr) { | |
914 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
915 | } | |
916 | ||
917 | DBG3("UST app event %s allocated", ua_event->name); | |
918 | ||
919 | return ua_event; | |
920 | ||
921 | error: | |
922 | return NULL; | |
923 | } | |
924 | ||
925 | /* | |
926 | * Alloc new UST app context. | |
927 | */ | |
928 | static | |
929 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
930 | { | |
931 | struct ust_app_ctx *ua_ctx; | |
932 | ||
933 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
934 | if (ua_ctx == NULL) { | |
935 | goto error; | |
936 | } | |
937 | ||
31746f93 DG |
938 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
939 | ||
8b366481 DG |
940 | if (uctx) { |
941 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
942 | } | |
943 | ||
944 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
945 | ||
946 | error: | |
947 | return ua_ctx; | |
948 | } | |
949 | ||
025faf73 DG |
950 | /* |
951 | * Allocate a filter and copy the given original filter. | |
952 | * | |
953 | * Return allocated filter or NULL on error. | |
954 | */ | |
955 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
956 | struct lttng_ust_filter_bytecode *orig_f) | |
957 | { | |
958 | struct lttng_ust_filter_bytecode *filter = NULL; | |
959 | ||
960 | /* Copy filter bytecode */ | |
961 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
962 | if (!filter) { | |
963 | PERROR("zmalloc alloc ust app filter"); | |
964 | goto error; | |
965 | } | |
966 | ||
967 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
968 | ||
969 | error: | |
970 | return filter; | |
971 | } | |
972 | ||
099e26bd | 973 | /* |
421cb601 DG |
974 | * Find an ust_app using the sock and return it. RCU read side lock must be |
975 | * held before calling this helper function. | |
099e26bd | 976 | */ |
f20baf8e | 977 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 978 | { |
bec39940 | 979 | struct lttng_ht_node_ulong *node; |
bec39940 | 980 | struct lttng_ht_iter iter; |
f6a9efaa | 981 | |
852d0037 | 982 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 983 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
984 | if (node == NULL) { |
985 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
986 | goto error; |
987 | } | |
852d0037 DG |
988 | |
989 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
990 | |
991 | error: | |
992 | return NULL; | |
099e26bd DG |
993 | } |
994 | ||
d0b96690 DG |
995 | /* |
996 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
997 | * be held before calling this helper function. | |
998 | */ | |
999 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1000 | { | |
1001 | struct lttng_ht_node_ulong *node; | |
1002 | struct lttng_ht_iter iter; | |
1003 | ||
1004 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1005 | &iter); | |
1006 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1007 | if (node == NULL) { | |
1008 | DBG2("UST app find by notify sock %d not found", sock); | |
1009 | goto error; | |
1010 | } | |
1011 | ||
1012 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1013 | ||
1014 | error: | |
1015 | return NULL; | |
1016 | } | |
1017 | ||
025faf73 DG |
1018 | /* |
1019 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1020 | * event loglevel. | |
1021 | * | |
1022 | * Return an ust_app_event object or NULL on error. | |
1023 | */ | |
18eace3b | 1024 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
39c5a3a7 JI |
1025 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel, |
1026 | const struct lttng_event_exclusion *exclusion) | |
18eace3b DG |
1027 | { |
1028 | struct lttng_ht_iter iter; | |
1029 | struct lttng_ht_node_str *node; | |
1030 | struct ust_app_event *event = NULL; | |
1031 | struct ust_app_ht_key key; | |
18eace3b DG |
1032 | |
1033 | assert(name); | |
1034 | assert(ht); | |
1035 | ||
1036 | /* Setup key for event lookup. */ | |
1037 | key.name = name; | |
1038 | key.filter = filter; | |
1039 | key.loglevel = loglevel; | |
39c5a3a7 JI |
1040 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
1041 | key.exclusion = (struct lttng_ust_event_exclusion *)exclusion; | |
18eace3b | 1042 | |
025faf73 DG |
1043 | /* Lookup using the event name as hash and a custom match fct. */ |
1044 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1045 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1046 | node = lttng_ht_iter_get_node_str(&iter); |
1047 | if (node == NULL) { | |
1048 | goto end; | |
1049 | } | |
1050 | ||
1051 | event = caa_container_of(node, struct ust_app_event, node); | |
1052 | ||
1053 | end: | |
18eace3b DG |
1054 | return event; |
1055 | } | |
1056 | ||
55cc08a6 DG |
1057 | /* |
1058 | * Create the channel context on the tracer. | |
d0b96690 DG |
1059 | * |
1060 | * Called with UST app session lock held. | |
55cc08a6 DG |
1061 | */ |
1062 | static | |
1063 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1064 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1065 | { | |
1066 | int ret; | |
1067 | ||
840cb59c | 1068 | health_code_update(); |
86acf0da | 1069 | |
852d0037 | 1070 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1071 | ua_chan->obj, &ua_ctx->obj); |
1072 | if (ret < 0) { | |
ffe60014 DG |
1073 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1074 | ERR("UST app create channel context failed for app (pid: %d) " | |
1075 | "with ret %d", app->pid, ret); | |
1076 | } else { | |
3757b385 DG |
1077 | /* |
1078 | * This is normal behavior, an application can die during the | |
1079 | * creation process. Don't report an error so the execution can | |
1080 | * continue normally. | |
1081 | */ | |
1082 | ret = 0; | |
ffe60014 DG |
1083 | DBG3("UST app disable event failed. Application is dead."); |
1084 | } | |
55cc08a6 DG |
1085 | goto error; |
1086 | } | |
1087 | ||
1088 | ua_ctx->handle = ua_ctx->obj->handle; | |
1089 | ||
d0b96690 DG |
1090 | DBG2("UST app context handle %d created successfully for channel %s", |
1091 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1092 | |
1093 | error: | |
840cb59c | 1094 | health_code_update(); |
55cc08a6 DG |
1095 | return ret; |
1096 | } | |
1097 | ||
53a80697 MD |
1098 | /* |
1099 | * Set the filter on the tracer. | |
1100 | */ | |
1101 | static | |
1102 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1103 | struct ust_app *app) | |
1104 | { | |
1105 | int ret; | |
1106 | ||
840cb59c | 1107 | health_code_update(); |
86acf0da | 1108 | |
53a80697 | 1109 | if (!ua_event->filter) { |
86acf0da DG |
1110 | ret = 0; |
1111 | goto error; | |
53a80697 MD |
1112 | } |
1113 | ||
1114 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1115 | ua_event->obj); | |
1116 | if (ret < 0) { | |
ffe60014 DG |
1117 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1118 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1119 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1120 | } else { | |
3757b385 DG |
1121 | /* |
1122 | * This is normal behavior, an application can die during the | |
1123 | * creation process. Don't report an error so the execution can | |
1124 | * continue normally. | |
1125 | */ | |
1126 | ret = 0; | |
ffe60014 DG |
1127 | DBG3("UST app filter event failed. Application is dead."); |
1128 | } | |
53a80697 MD |
1129 | goto error; |
1130 | } | |
1131 | ||
1132 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1133 | ||
1134 | error: | |
840cb59c | 1135 | health_code_update(); |
53a80697 MD |
1136 | return ret; |
1137 | } | |
1138 | ||
7cc9a73c JI |
1139 | /* |
1140 | * Set event exclusions on the tracer. | |
1141 | */ | |
1142 | static | |
1143 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1144 | struct ust_app *app) | |
1145 | { | |
1146 | int ret; | |
1147 | ||
1148 | health_code_update(); | |
1149 | ||
1150 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1151 | ret = 0; | |
1152 | goto error; | |
1153 | } | |
1154 | ||
1155 | ret = ustctl_set_exclusion(app->sock, ua_event->exclusion, | |
1156 | ua_event->obj); | |
1157 | if (ret < 0) { | |
1158 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1159 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1160 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1161 | } else { | |
1162 | /* | |
1163 | * This is normal behavior, an application can die during the | |
1164 | * creation process. Don't report an error so the execution can | |
1165 | * continue normally. | |
1166 | */ | |
1167 | ret = 0; | |
1168 | DBG3("UST app event exclusion failed. Application is dead."); | |
1169 | } | |
1170 | goto error; | |
1171 | } | |
1172 | ||
1173 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1174 | ||
1175 | error: | |
1176 | health_code_update(); | |
1177 | return ret; | |
1178 | } | |
1179 | ||
9730260e DG |
1180 | /* |
1181 | * Disable the specified event on to UST tracer for the UST session. | |
1182 | */ | |
1183 | static int disable_ust_event(struct ust_app *app, | |
1184 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1185 | { | |
1186 | int ret; | |
1187 | ||
840cb59c | 1188 | health_code_update(); |
86acf0da | 1189 | |
852d0037 | 1190 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1191 | if (ret < 0) { |
ffe60014 DG |
1192 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1193 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1194 | "and session handle %d with ret %d", | |
1195 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1196 | } else { | |
3757b385 DG |
1197 | /* |
1198 | * This is normal behavior, an application can die during the | |
1199 | * creation process. Don't report an error so the execution can | |
1200 | * continue normally. | |
1201 | */ | |
1202 | ret = 0; | |
ffe60014 DG |
1203 | DBG3("UST app disable event failed. Application is dead."); |
1204 | } | |
9730260e DG |
1205 | goto error; |
1206 | } | |
1207 | ||
1208 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1209 | ua_event->attr.name, app->pid); |
9730260e DG |
1210 | |
1211 | error: | |
840cb59c | 1212 | health_code_update(); |
9730260e DG |
1213 | return ret; |
1214 | } | |
1215 | ||
78f0bacd DG |
1216 | /* |
1217 | * Disable the specified channel on to UST tracer for the UST session. | |
1218 | */ | |
1219 | static int disable_ust_channel(struct ust_app *app, | |
1220 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1221 | { | |
1222 | int ret; | |
1223 | ||
840cb59c | 1224 | health_code_update(); |
86acf0da | 1225 | |
852d0037 | 1226 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1227 | if (ret < 0) { |
ffe60014 DG |
1228 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1229 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1230 | "and session handle %d with ret %d", | |
1231 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1232 | } else { | |
3757b385 DG |
1233 | /* |
1234 | * This is normal behavior, an application can die during the | |
1235 | * creation process. Don't report an error so the execution can | |
1236 | * continue normally. | |
1237 | */ | |
1238 | ret = 0; | |
ffe60014 DG |
1239 | DBG3("UST app disable channel failed. Application is dead."); |
1240 | } | |
78f0bacd DG |
1241 | goto error; |
1242 | } | |
1243 | ||
78f0bacd | 1244 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1245 | ua_chan->name, app->pid); |
78f0bacd DG |
1246 | |
1247 | error: | |
840cb59c | 1248 | health_code_update(); |
78f0bacd DG |
1249 | return ret; |
1250 | } | |
1251 | ||
1252 | /* | |
1253 | * Enable the specified channel on to UST tracer for the UST session. | |
1254 | */ | |
1255 | static int enable_ust_channel(struct ust_app *app, | |
1256 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1257 | { | |
1258 | int ret; | |
1259 | ||
840cb59c | 1260 | health_code_update(); |
86acf0da | 1261 | |
852d0037 | 1262 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1263 | if (ret < 0) { |
ffe60014 DG |
1264 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1265 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1266 | "and session handle %d with ret %d", | |
1267 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1268 | } else { | |
3757b385 DG |
1269 | /* |
1270 | * This is normal behavior, an application can die during the | |
1271 | * creation process. Don't report an error so the execution can | |
1272 | * continue normally. | |
1273 | */ | |
1274 | ret = 0; | |
ffe60014 DG |
1275 | DBG3("UST app enable channel failed. Application is dead."); |
1276 | } | |
78f0bacd DG |
1277 | goto error; |
1278 | } | |
1279 | ||
1280 | ua_chan->enabled = 1; | |
1281 | ||
1282 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1283 | ua_chan->name, app->pid); |
78f0bacd DG |
1284 | |
1285 | error: | |
840cb59c | 1286 | health_code_update(); |
78f0bacd DG |
1287 | return ret; |
1288 | } | |
1289 | ||
edb67388 DG |
1290 | /* |
1291 | * Enable the specified event on to UST tracer for the UST session. | |
1292 | */ | |
1293 | static int enable_ust_event(struct ust_app *app, | |
1294 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1295 | { | |
1296 | int ret; | |
1297 | ||
840cb59c | 1298 | health_code_update(); |
86acf0da | 1299 | |
852d0037 | 1300 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1301 | if (ret < 0) { |
ffe60014 DG |
1302 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1303 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1304 | "and session handle %d with ret %d", | |
1305 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1306 | } else { | |
3757b385 DG |
1307 | /* |
1308 | * This is normal behavior, an application can die during the | |
1309 | * creation process. Don't report an error so the execution can | |
1310 | * continue normally. | |
1311 | */ | |
1312 | ret = 0; | |
ffe60014 DG |
1313 | DBG3("UST app enable event failed. Application is dead."); |
1314 | } | |
edb67388 DG |
1315 | goto error; |
1316 | } | |
1317 | ||
1318 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1319 | ua_event->attr.name, app->pid); |
edb67388 DG |
1320 | |
1321 | error: | |
840cb59c | 1322 | health_code_update(); |
edb67388 DG |
1323 | return ret; |
1324 | } | |
1325 | ||
099e26bd | 1326 | /* |
7972aab2 | 1327 | * Send channel and stream buffer to application. |
4f3ab6ee | 1328 | * |
ffe60014 | 1329 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1330 | */ |
7972aab2 DG |
1331 | static int send_channel_pid_to_ust(struct ust_app *app, |
1332 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1333 | { |
1334 | int ret; | |
ffe60014 | 1335 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1336 | |
1337 | assert(app); | |
ffe60014 | 1338 | assert(ua_sess); |
4f3ab6ee | 1339 | assert(ua_chan); |
4f3ab6ee | 1340 | |
840cb59c | 1341 | health_code_update(); |
4f3ab6ee | 1342 | |
7972aab2 DG |
1343 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1344 | app->sock); | |
86acf0da | 1345 | |
ffe60014 DG |
1346 | /* Send channel to the application. */ |
1347 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1348 | if (ret < 0) { |
b551a063 DG |
1349 | goto error; |
1350 | } | |
1351 | ||
d88aee68 DG |
1352 | health_code_update(); |
1353 | ||
ffe60014 DG |
1354 | /* Send all streams to application. */ |
1355 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1356 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1357 | if (ret < 0) { | |
1358 | goto error; | |
1359 | } | |
1360 | /* We don't need the stream anymore once sent to the tracer. */ | |
1361 | cds_list_del(&stream->list); | |
1362 | delete_ust_app_stream(-1, stream); | |
1363 | } | |
ffe60014 DG |
1364 | /* Flag the channel that it is sent to the application. */ |
1365 | ua_chan->is_sent = 1; | |
ffe60014 | 1366 | |
b551a063 | 1367 | error: |
840cb59c | 1368 | health_code_update(); |
b551a063 DG |
1369 | return ret; |
1370 | } | |
1371 | ||
91d76f53 | 1372 | /* |
5b4a0ec0 | 1373 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1374 | * |
1375 | * Should be called with session mutex held. | |
91d76f53 | 1376 | */ |
edb67388 DG |
1377 | static |
1378 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1379 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1380 | { |
5b4a0ec0 | 1381 | int ret = 0; |
284d8f55 | 1382 | |
840cb59c | 1383 | health_code_update(); |
86acf0da | 1384 | |
5b4a0ec0 | 1385 | /* Create UST event on tracer */ |
852d0037 | 1386 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1387 | &ua_event->obj); |
1388 | if (ret < 0) { | |
ffe60014 DG |
1389 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1390 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1391 | ua_event->attr.name, app->pid, ret); | |
1392 | } else { | |
3757b385 DG |
1393 | /* |
1394 | * This is normal behavior, an application can die during the | |
1395 | * creation process. Don't report an error so the execution can | |
1396 | * continue normally. | |
1397 | */ | |
1398 | ret = 0; | |
ffe60014 DG |
1399 | DBG3("UST app create event failed. Application is dead."); |
1400 | } | |
5b4a0ec0 | 1401 | goto error; |
91d76f53 | 1402 | } |
f6a9efaa | 1403 | |
5b4a0ec0 | 1404 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1405 | |
5b4a0ec0 | 1406 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1407 | ua_event->attr.name, app->pid); |
f6a9efaa | 1408 | |
840cb59c | 1409 | health_code_update(); |
86acf0da | 1410 | |
025faf73 DG |
1411 | /* Set filter if one is present. */ |
1412 | if (ua_event->filter) { | |
1413 | ret = set_ust_event_filter(ua_event, app); | |
1414 | if (ret < 0) { | |
1415 | goto error; | |
1416 | } | |
1417 | } | |
1418 | ||
7cc9a73c JI |
1419 | /* Set exclusions for the event */ |
1420 | if (ua_event->exclusion) { | |
1421 | ret = set_ust_event_exclusion(ua_event, app); | |
1422 | if (ret < 0) { | |
1423 | goto error; | |
1424 | } | |
1425 | } | |
1426 | ||
8535a6d9 | 1427 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 1428 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
1429 | ret = disable_ust_event(app, ua_sess, ua_event); |
1430 | if (ret < 0) { | |
fc34caaa DG |
1431 | /* |
1432 | * If we hit an EPERM, something is wrong with our disable call. If | |
1433 | * we get an EEXIST, there is a problem on the tracer side since we | |
1434 | * just created it. | |
1435 | */ | |
1436 | switch (ret) { | |
49c336c1 | 1437 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1438 | /* Code flow problem */ |
1439 | assert(0); | |
49c336c1 | 1440 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1441 | /* It's OK for our use case. */ |
1442 | ret = 0; | |
1443 | break; | |
1444 | default: | |
1445 | break; | |
1446 | } | |
8535a6d9 DG |
1447 | goto error; |
1448 | } | |
1449 | } | |
1450 | ||
5b4a0ec0 | 1451 | error: |
840cb59c | 1452 | health_code_update(); |
5b4a0ec0 | 1453 | return ret; |
91d76f53 | 1454 | } |
48842b30 | 1455 | |
5b4a0ec0 DG |
1456 | /* |
1457 | * Copy data between an UST app event and a LTT event. | |
1458 | */ | |
421cb601 | 1459 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1460 | struct ltt_ust_event *uevent) |
1461 | { | |
b4ffad32 JI |
1462 | size_t exclusion_alloc_size; |
1463 | ||
48842b30 DG |
1464 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1465 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1466 | ||
fc34caaa DG |
1467 | ua_event->enabled = uevent->enabled; |
1468 | ||
5b4a0ec0 DG |
1469 | /* Copy event attributes */ |
1470 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1471 | ||
53a80697 MD |
1472 | /* Copy filter bytecode */ |
1473 | if (uevent->filter) { | |
025faf73 DG |
1474 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1475 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1476 | } |
b4ffad32 JI |
1477 | |
1478 | /* Copy exclusion data */ | |
1479 | if (uevent->exclusion) { | |
1480 | exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1481 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; | |
1482 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1483 | if (ua_event->exclusion == NULL) { |
1484 | PERROR("malloc"); | |
1485 | } else { | |
1486 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1487 | exclusion_alloc_size); | |
b4ffad32 JI |
1488 | } |
1489 | } | |
48842b30 DG |
1490 | } |
1491 | ||
5b4a0ec0 DG |
1492 | /* |
1493 | * Copy data between an UST app channel and a LTT channel. | |
1494 | */ | |
421cb601 | 1495 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1496 | struct ltt_ust_channel *uchan) |
1497 | { | |
bec39940 | 1498 | struct lttng_ht_iter iter; |
48842b30 | 1499 | struct ltt_ust_event *uevent; |
55cc08a6 | 1500 | struct ltt_ust_context *uctx; |
48842b30 | 1501 | struct ust_app_event *ua_event; |
55cc08a6 | 1502 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1503 | |
fc34caaa | 1504 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1505 | |
1506 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1507 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1508 | |
1624d5b7 JD |
1509 | ua_chan->tracefile_size = uchan->tracefile_size; |
1510 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1511 | ||
ffe60014 DG |
1512 | /* Copy event attributes since the layout is different. */ |
1513 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1514 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1515 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1516 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1517 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1518 | ua_chan->attr.output = uchan->attr.output; | |
1519 | /* | |
1520 | * Note that the attribute channel type is not set since the channel on the | |
1521 | * tracing registry side does not have this information. | |
1522 | */ | |
48842b30 | 1523 | |
fc34caaa | 1524 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1525 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1526 | |
31746f93 | 1527 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1528 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1529 | if (ua_ctx == NULL) { | |
1530 | continue; | |
1531 | } | |
bec39940 DG |
1532 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1533 | (unsigned long) ua_ctx->ctx.ctx); | |
1534 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
31746f93 | 1535 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1536 | } |
48842b30 | 1537 | |
421cb601 | 1538 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1539 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1540 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1541 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1542 | if (ua_event == NULL) { |
421cb601 | 1543 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1544 | uevent->attr.name); |
284d8f55 | 1545 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1546 | if (ua_event == NULL) { |
5b4a0ec0 | 1547 | continue; |
48842b30 | 1548 | } |
421cb601 | 1549 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1550 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1551 | } |
48842b30 DG |
1552 | } |
1553 | ||
fc34caaa | 1554 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1555 | } |
1556 | ||
5b4a0ec0 DG |
1557 | /* |
1558 | * Copy data between a UST app session and a regular LTT session. | |
1559 | */ | |
421cb601 | 1560 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1561 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1562 | { |
bec39940 DG |
1563 | struct lttng_ht_node_str *ua_chan_node; |
1564 | struct lttng_ht_iter iter; | |
48842b30 DG |
1565 | struct ltt_ust_channel *uchan; |
1566 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1567 | time_t rawtime; |
1568 | struct tm *timeinfo; | |
1569 | char datetime[16]; | |
1570 | int ret; | |
1571 | ||
1572 | /* Get date and time for unique app path */ | |
1573 | time(&rawtime); | |
1574 | timeinfo = localtime(&rawtime); | |
1575 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1576 | |
421cb601 | 1577 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1578 | |
7972aab2 DG |
1579 | ua_sess->tracing_id = usess->id; |
1580 | ua_sess->id = get_next_session_id(); | |
1581 | ua_sess->uid = app->uid; | |
1582 | ua_sess->gid = app->gid; | |
1583 | ua_sess->euid = usess->uid; | |
1584 | ua_sess->egid = usess->gid; | |
1585 | ua_sess->buffer_type = usess->buffer_type; | |
1586 | ua_sess->bits_per_long = app->bits_per_long; | |
1587 | /* There is only one consumer object per session possible. */ | |
1588 | ua_sess->consumer = usess->consumer; | |
2bba9e53 | 1589 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1590 | ua_sess->live_timer_interval = usess->live_timer_interval; |
7972aab2 DG |
1591 | |
1592 | switch (ua_sess->buffer_type) { | |
1593 | case LTTNG_BUFFER_PER_PID: | |
1594 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1595 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1596 | datetime); |
1597 | break; | |
1598 | case LTTNG_BUFFER_PER_UID: | |
1599 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1600 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1601 | break; | |
1602 | default: | |
1603 | assert(0); | |
1604 | goto error; | |
1605 | } | |
477d7741 MD |
1606 | if (ret < 0) { |
1607 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1608 | assert(0); |
7972aab2 | 1609 | goto error; |
477d7741 MD |
1610 | } |
1611 | ||
48842b30 | 1612 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1613 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1614 | uchan, node.node) { | |
1615 | struct lttng_ht_iter uiter; | |
ba767faf | 1616 | |
bec39940 DG |
1617 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1618 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1619 | if (ua_chan_node != NULL) { |
fc34caaa | 1620 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1621 | continue; |
1622 | } | |
421cb601 | 1623 | |
5b4a0ec0 DG |
1624 | DBG2("Channel %s not found on shadow session copy, creating it", |
1625 | uchan->name); | |
d0b96690 | 1626 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1627 | if (ua_chan == NULL) { |
fc34caaa | 1628 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1629 | continue; |
48842b30 | 1630 | } |
5b4a0ec0 | 1631 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1632 | /* |
1633 | * The concept of metadata channel does not exist on the tracing | |
1634 | * registry side of the session daemon so this can only be a per CPU | |
1635 | * channel and not metadata. | |
1636 | */ | |
1637 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1638 | ||
bec39940 | 1639 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1640 | } |
7972aab2 DG |
1641 | |
1642 | error: | |
1643 | return; | |
48842b30 DG |
1644 | } |
1645 | ||
78f0bacd DG |
1646 | /* |
1647 | * Lookup sesison wrapper. | |
1648 | */ | |
84cd17c6 MD |
1649 | static |
1650 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1651 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1652 | { |
1653 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1654 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1655 | } |
1656 | ||
421cb601 DG |
1657 | /* |
1658 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1659 | * id. |
421cb601 | 1660 | */ |
48842b30 DG |
1661 | static struct ust_app_session *lookup_session_by_app( |
1662 | struct ltt_ust_session *usess, struct ust_app *app) | |
1663 | { | |
bec39940 | 1664 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1665 | struct lttng_ht_node_u64 *node; |
48842b30 | 1666 | |
84cd17c6 | 1667 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1668 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1669 | if (node == NULL) { |
1670 | goto error; | |
1671 | } | |
1672 | ||
1673 | return caa_container_of(node, struct ust_app_session, node); | |
1674 | ||
1675 | error: | |
1676 | return NULL; | |
1677 | } | |
1678 | ||
7972aab2 DG |
1679 | /* |
1680 | * Setup buffer registry per PID for the given session and application. If none | |
1681 | * is found, a new one is created, added to the global registry and | |
1682 | * initialized. If regp is valid, it's set with the newly created object. | |
1683 | * | |
1684 | * Return 0 on success or else a negative value. | |
1685 | */ | |
1686 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1687 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1688 | { | |
1689 | int ret = 0; | |
1690 | struct buffer_reg_pid *reg_pid; | |
1691 | ||
1692 | assert(ua_sess); | |
1693 | assert(app); | |
1694 | ||
1695 | rcu_read_lock(); | |
1696 | ||
1697 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1698 | if (!reg_pid) { | |
1699 | /* | |
1700 | * This is the create channel path meaning that if there is NO | |
1701 | * registry available, we have to create one for this session. | |
1702 | */ | |
1703 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1704 | if (ret < 0) { | |
1705 | goto error; | |
1706 | } | |
1707 | buffer_reg_pid_add(reg_pid); | |
1708 | } else { | |
1709 | goto end; | |
1710 | } | |
1711 | ||
1712 | /* Initialize registry. */ | |
1713 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1714 | app->bits_per_long, app->uint8_t_alignment, | |
1715 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1716 | app->uint64_t_alignment, app->long_alignment, |
1717 | app->byte_order, app->version.major, | |
1718 | app->version.minor); | |
7972aab2 DG |
1719 | if (ret < 0) { |
1720 | goto error; | |
1721 | } | |
1722 | ||
1723 | DBG3("UST app buffer registry per PID created successfully"); | |
1724 | ||
1725 | end: | |
1726 | if (regp) { | |
1727 | *regp = reg_pid; | |
1728 | } | |
1729 | error: | |
1730 | rcu_read_unlock(); | |
1731 | return ret; | |
1732 | } | |
1733 | ||
1734 | /* | |
1735 | * Setup buffer registry per UID for the given session and application. If none | |
1736 | * is found, a new one is created, added to the global registry and | |
1737 | * initialized. If regp is valid, it's set with the newly created object. | |
1738 | * | |
1739 | * Return 0 on success or else a negative value. | |
1740 | */ | |
1741 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1742 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1743 | { | |
1744 | int ret = 0; | |
1745 | struct buffer_reg_uid *reg_uid; | |
1746 | ||
1747 | assert(usess); | |
1748 | assert(app); | |
1749 | ||
1750 | rcu_read_lock(); | |
1751 | ||
1752 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1753 | if (!reg_uid) { | |
1754 | /* | |
1755 | * This is the create channel path meaning that if there is NO | |
1756 | * registry available, we have to create one for this session. | |
1757 | */ | |
1758 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1759 | LTTNG_DOMAIN_UST, ®_uid); | |
1760 | if (ret < 0) { | |
1761 | goto error; | |
1762 | } | |
1763 | buffer_reg_uid_add(reg_uid); | |
1764 | } else { | |
1765 | goto end; | |
1766 | } | |
1767 | ||
1768 | /* Initialize registry. */ | |
af6142cf | 1769 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1770 | app->bits_per_long, app->uint8_t_alignment, |
1771 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1772 | app->uint64_t_alignment, app->long_alignment, |
1773 | app->byte_order, app->version.major, | |
1774 | app->version.minor); | |
7972aab2 DG |
1775 | if (ret < 0) { |
1776 | goto error; | |
1777 | } | |
1778 | /* Add node to teardown list of the session. */ | |
1779 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1780 | ||
1781 | DBG3("UST app buffer registry per UID created successfully"); | |
1782 | ||
1783 | end: | |
1784 | if (regp) { | |
1785 | *regp = reg_uid; | |
1786 | } | |
1787 | error: | |
1788 | rcu_read_unlock(); | |
1789 | return ret; | |
1790 | } | |
1791 | ||
421cb601 | 1792 | /* |
3d8ca23b | 1793 | * Create a session on the tracer side for the given app. |
421cb601 | 1794 | * |
3d8ca23b DG |
1795 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1796 | * untouched. If the session was created, is_created is set to 1. On error, | |
1797 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1798 | * be NULL. | |
1799 | * | |
1800 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1801 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1802 | */ |
3d8ca23b DG |
1803 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1804 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1805 | int *is_created) | |
421cb601 | 1806 | { |
3d8ca23b | 1807 | int ret, created = 0; |
421cb601 DG |
1808 | struct ust_app_session *ua_sess; |
1809 | ||
3d8ca23b DG |
1810 | assert(usess); |
1811 | assert(app); | |
1812 | assert(ua_sess_ptr); | |
1813 | ||
840cb59c | 1814 | health_code_update(); |
86acf0da | 1815 | |
421cb601 DG |
1816 | ua_sess = lookup_session_by_app(usess, app); |
1817 | if (ua_sess == NULL) { | |
d9bf3ca4 | 1818 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1819 | app->pid, usess->id); |
d0b96690 | 1820 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1821 | if (ua_sess == NULL) { |
1822 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1823 | ret = -ENOMEM; |
1824 | goto error; | |
421cb601 | 1825 | } |
477d7741 | 1826 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1827 | created = 1; |
421cb601 DG |
1828 | } |
1829 | ||
7972aab2 DG |
1830 | switch (usess->buffer_type) { |
1831 | case LTTNG_BUFFER_PER_PID: | |
1832 | /* Init local registry. */ | |
1833 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1834 | if (ret < 0) { |
7972aab2 DG |
1835 | goto error; |
1836 | } | |
1837 | break; | |
1838 | case LTTNG_BUFFER_PER_UID: | |
1839 | /* Look for a global registry. If none exists, create one. */ | |
1840 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1841 | if (ret < 0) { | |
1842 | goto error; | |
1843 | } | |
1844 | break; | |
1845 | default: | |
1846 | assert(0); | |
1847 | ret = -EINVAL; | |
1848 | goto error; | |
1849 | } | |
1850 | ||
1851 | health_code_update(); | |
1852 | ||
1853 | if (ua_sess->handle == -1) { | |
1854 | ret = ustctl_create_session(app->sock); | |
1855 | if (ret < 0) { | |
1856 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1857 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1858 | app->pid, ret); |
1859 | } else { | |
1860 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
1861 | /* |
1862 | * This is normal behavior, an application can die during the | |
1863 | * creation process. Don't report an error so the execution can | |
1864 | * continue normally. This will get flagged ENOTCONN and the | |
1865 | * caller will handle it. | |
1866 | */ | |
1867 | ret = 0; | |
ffe60014 | 1868 | } |
d0b96690 | 1869 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1870 | if (ret != -ENOMEM) { |
1871 | /* | |
1872 | * Tracer is probably gone or got an internal error so let's | |
1873 | * behave like it will soon unregister or not usable. | |
1874 | */ | |
1875 | ret = -ENOTCONN; | |
1876 | } | |
1877 | goto error; | |
421cb601 DG |
1878 | } |
1879 | ||
7972aab2 DG |
1880 | ua_sess->handle = ret; |
1881 | ||
1882 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
1883 | lttng_ht_node_init_u64(&ua_sess->node, |
1884 | ua_sess->tracing_id); | |
1885 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1886 | |
1887 | DBG2("UST app session created successfully with handle %d", ret); | |
1888 | } | |
1889 | ||
1890 | *ua_sess_ptr = ua_sess; | |
1891 | if (is_created) { | |
1892 | *is_created = created; | |
1893 | } | |
1894 | ||
1895 | /* Everything went well. */ | |
1896 | ret = 0; | |
1897 | ||
1898 | error: | |
1899 | health_code_update(); | |
1900 | return ret; | |
1901 | } | |
1902 | ||
1903 | /* | |
1904 | * Create a context for the channel on the tracer. | |
1905 | * | |
1906 | * Called with UST app session lock held and a RCU read side lock. | |
1907 | */ | |
1908 | static | |
1909 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1910 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1911 | struct ust_app *app) | |
1912 | { | |
1913 | int ret = 0; | |
1914 | struct lttng_ht_iter iter; | |
1915 | struct lttng_ht_node_ulong *node; | |
1916 | struct ust_app_ctx *ua_ctx; | |
1917 | ||
1918 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1919 | ||
1920 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); | |
1921 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1922 | if (node != NULL) { | |
1923 | ret = -EEXIST; | |
1924 | goto error; | |
1925 | } | |
1926 | ||
1927 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1928 | if (ua_ctx == NULL) { | |
1929 | /* malloc failed */ | |
1930 | ret = -1; | |
1931 | goto error; | |
1932 | } | |
1933 | ||
1934 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
1935 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
31746f93 | 1936 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
1937 | |
1938 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1939 | if (ret < 0) { | |
1940 | goto error; | |
1941 | } | |
1942 | ||
1943 | error: | |
1944 | return ret; | |
1945 | } | |
1946 | ||
1947 | /* | |
1948 | * Enable on the tracer side a ust app event for the session and channel. | |
1949 | * | |
1950 | * Called with UST app session lock held. | |
1951 | */ | |
1952 | static | |
1953 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
1954 | struct ust_app_event *ua_event, struct ust_app *app) | |
1955 | { | |
1956 | int ret; | |
1957 | ||
1958 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1959 | if (ret < 0) { | |
1960 | goto error; | |
1961 | } | |
1962 | ||
1963 | ua_event->enabled = 1; | |
1964 | ||
1965 | error: | |
1966 | return ret; | |
1967 | } | |
1968 | ||
1969 | /* | |
1970 | * Disable on the tracer side a ust app event for the session and channel. | |
1971 | */ | |
1972 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
1973 | struct ust_app_event *ua_event, struct ust_app *app) | |
1974 | { | |
1975 | int ret; | |
1976 | ||
1977 | ret = disable_ust_event(app, ua_sess, ua_event); | |
1978 | if (ret < 0) { | |
1979 | goto error; | |
1980 | } | |
1981 | ||
1982 | ua_event->enabled = 0; | |
1983 | ||
1984 | error: | |
1985 | return ret; | |
1986 | } | |
1987 | ||
1988 | /* | |
1989 | * Lookup ust app channel for session and disable it on the tracer side. | |
1990 | */ | |
1991 | static | |
1992 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
1993 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
1994 | { | |
1995 | int ret; | |
1996 | ||
1997 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
1998 | if (ret < 0) { | |
1999 | goto error; | |
2000 | } | |
2001 | ||
2002 | ua_chan->enabled = 0; | |
2003 | ||
2004 | error: | |
2005 | return ret; | |
2006 | } | |
2007 | ||
2008 | /* | |
2009 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2010 | * MUST be called with a RCU read side lock acquired. | |
2011 | */ | |
2012 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2013 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2014 | { | |
2015 | int ret = 0; | |
2016 | struct lttng_ht_iter iter; | |
2017 | struct lttng_ht_node_str *ua_chan_node; | |
2018 | struct ust_app_channel *ua_chan; | |
2019 | ||
2020 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2021 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2022 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2023 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2024 | uchan->name, ua_sess->tracing_id); |
2025 | goto error; | |
2026 | } | |
2027 | ||
2028 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2029 | ||
2030 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2031 | if (ret < 0) { | |
2032 | goto error; | |
2033 | } | |
2034 | ||
2035 | error: | |
2036 | return ret; | |
2037 | } | |
2038 | ||
2039 | /* | |
2040 | * Ask the consumer to create a channel and get it if successful. | |
2041 | * | |
2042 | * Return 0 on success or else a negative value. | |
2043 | */ | |
2044 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2045 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2046 | int bitness, struct ust_registry_session *registry) | |
2047 | { | |
2048 | int ret; | |
2049 | unsigned int nb_fd = 0; | |
2050 | struct consumer_socket *socket; | |
2051 | ||
2052 | assert(usess); | |
2053 | assert(ua_sess); | |
2054 | assert(ua_chan); | |
2055 | assert(registry); | |
2056 | ||
2057 | rcu_read_lock(); | |
2058 | health_code_update(); | |
2059 | ||
2060 | /* Get the right consumer socket for the application. */ | |
2061 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2062 | if (!socket) { | |
2063 | ret = -EINVAL; | |
2064 | goto error; | |
2065 | } | |
2066 | ||
2067 | health_code_update(); | |
2068 | ||
2069 | /* Need one fd for the channel. */ | |
2070 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2071 | if (ret < 0) { | |
2072 | ERR("Exhausted number of available FD upon create channel"); | |
2073 | goto error; | |
2074 | } | |
2075 | ||
2076 | /* | |
2077 | * Ask consumer to create channel. The consumer will return the number of | |
2078 | * stream we have to expect. | |
2079 | */ | |
2080 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2081 | registry); | |
2082 | if (ret < 0) { | |
2083 | goto error_ask; | |
2084 | } | |
2085 | ||
2086 | /* | |
2087 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2088 | * stream (2 being the default value here). | |
2089 | */ | |
2090 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2091 | ||
2092 | /* Reserve the amount of file descriptor we need. */ | |
2093 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2094 | if (ret < 0) { | |
2095 | ERR("Exhausted number of available FD upon create channel"); | |
2096 | goto error_fd_get_stream; | |
2097 | } | |
2098 | ||
2099 | health_code_update(); | |
2100 | ||
2101 | /* | |
2102 | * Now get the channel from the consumer. This call wil populate the stream | |
2103 | * list of that channel and set the ust objects. | |
2104 | */ | |
d9078d0c DG |
2105 | if (usess->consumer->enabled) { |
2106 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2107 | if (ret < 0) { | |
2108 | goto error_destroy; | |
2109 | } | |
7972aab2 DG |
2110 | } |
2111 | ||
2112 | rcu_read_unlock(); | |
2113 | return 0; | |
2114 | ||
2115 | error_destroy: | |
2116 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2117 | error_fd_get_stream: | |
2118 | /* | |
2119 | * Initiate a destroy channel on the consumer since we had an error | |
2120 | * handling it on our side. The return value is of no importance since we | |
2121 | * already have a ret value set by the previous error that we need to | |
2122 | * return. | |
2123 | */ | |
2124 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2125 | error_ask: | |
2126 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2127 | error: | |
2128 | health_code_update(); | |
2129 | rcu_read_unlock(); | |
2130 | return ret; | |
2131 | } | |
2132 | ||
2133 | /* | |
2134 | * Duplicate the ust data object of the ust app stream and save it in the | |
2135 | * buffer registry stream. | |
2136 | * | |
2137 | * Return 0 on success or else a negative value. | |
2138 | */ | |
2139 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2140 | struct ust_app_stream *stream) | |
2141 | { | |
2142 | int ret; | |
2143 | ||
2144 | assert(reg_stream); | |
2145 | assert(stream); | |
2146 | ||
2147 | /* Reserve the amount of file descriptor we need. */ | |
2148 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2149 | if (ret < 0) { | |
2150 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2151 | goto error; | |
2152 | } | |
2153 | ||
2154 | /* Duplicate object for stream once the original is in the registry. */ | |
2155 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2156 | reg_stream->obj.ust); | |
2157 | if (ret < 0) { | |
2158 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2159 | reg_stream->obj.ust, stream->obj, ret); | |
2160 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2161 | goto error; | |
2162 | } | |
2163 | stream->handle = stream->obj->handle; | |
2164 | ||
2165 | error: | |
2166 | return ret; | |
2167 | } | |
2168 | ||
2169 | /* | |
2170 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2171 | * buffer registry channel. | |
2172 | * | |
2173 | * Return 0 on success or else a negative value. | |
2174 | */ | |
2175 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2176 | struct ust_app_channel *ua_chan) | |
2177 | { | |
2178 | int ret; | |
2179 | ||
2180 | assert(reg_chan); | |
2181 | assert(ua_chan); | |
2182 | ||
2183 | /* Need two fds for the channel. */ | |
2184 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2185 | if (ret < 0) { | |
2186 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2187 | goto error_fd_get; | |
2188 | } | |
2189 | ||
2190 | /* Duplicate object for stream once the original is in the registry. */ | |
2191 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2192 | if (ret < 0) { | |
2193 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2194 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2195 | goto error; | |
2196 | } | |
2197 | ua_chan->handle = ua_chan->obj->handle; | |
2198 | ||
2199 | return 0; | |
2200 | ||
2201 | error: | |
2202 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2203 | error_fd_get: | |
2204 | return ret; | |
2205 | } | |
2206 | ||
2207 | /* | |
2208 | * For a given channel buffer registry, setup all streams of the given ust | |
2209 | * application channel. | |
2210 | * | |
2211 | * Return 0 on success or else a negative value. | |
2212 | */ | |
2213 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2214 | struct ust_app_channel *ua_chan) | |
2215 | { | |
2216 | int ret = 0; | |
2217 | struct ust_app_stream *stream, *stmp; | |
2218 | ||
2219 | assert(reg_chan); | |
2220 | assert(ua_chan); | |
2221 | ||
2222 | DBG2("UST app setup buffer registry stream"); | |
2223 | ||
2224 | /* Send all streams to application. */ | |
2225 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2226 | struct buffer_reg_stream *reg_stream; | |
2227 | ||
2228 | ret = buffer_reg_stream_create(®_stream); | |
2229 | if (ret < 0) { | |
2230 | goto error; | |
2231 | } | |
2232 | ||
2233 | /* | |
2234 | * Keep original pointer and nullify it in the stream so the delete | |
2235 | * stream call does not release the object. | |
2236 | */ | |
2237 | reg_stream->obj.ust = stream->obj; | |
2238 | stream->obj = NULL; | |
2239 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2240 | |
7972aab2 DG |
2241 | /* We don't need the streams anymore. */ |
2242 | cds_list_del(&stream->list); | |
2243 | delete_ust_app_stream(-1, stream); | |
2244 | } | |
421cb601 | 2245 | |
7972aab2 DG |
2246 | error: |
2247 | return ret; | |
2248 | } | |
2249 | ||
2250 | /* | |
2251 | * Create a buffer registry channel for the given session registry and | |
2252 | * application channel object. If regp pointer is valid, it's set with the | |
2253 | * created object. Important, the created object is NOT added to the session | |
2254 | * registry hash table. | |
2255 | * | |
2256 | * Return 0 on success else a negative value. | |
2257 | */ | |
2258 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2259 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2260 | { | |
2261 | int ret; | |
2262 | struct buffer_reg_channel *reg_chan = NULL; | |
2263 | ||
2264 | assert(reg_sess); | |
2265 | assert(ua_chan); | |
2266 | ||
2267 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2268 | ||
2269 | /* Create buffer registry channel. */ | |
2270 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2271 | if (ret < 0) { | |
2272 | goto error_create; | |
421cb601 | 2273 | } |
7972aab2 DG |
2274 | assert(reg_chan); |
2275 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2276 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
421cb601 | 2277 | |
7972aab2 DG |
2278 | /* Create and add a channel registry to session. */ |
2279 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2280 | ua_chan->tracing_channel_id); | |
2281 | if (ret < 0) { | |
2282 | goto error; | |
d88aee68 | 2283 | } |
7972aab2 | 2284 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2285 | |
7972aab2 DG |
2286 | if (regp) { |
2287 | *regp = reg_chan; | |
3d8ca23b | 2288 | } |
d88aee68 | 2289 | |
7972aab2 | 2290 | return 0; |
3d8ca23b DG |
2291 | |
2292 | error: | |
7972aab2 DG |
2293 | /* Safe because the registry channel object was not added to any HT. */ |
2294 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2295 | error_create: | |
3d8ca23b | 2296 | return ret; |
421cb601 DG |
2297 | } |
2298 | ||
55cc08a6 | 2299 | /* |
7972aab2 DG |
2300 | * Setup buffer registry channel for the given session registry and application |
2301 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2302 | * |
7972aab2 | 2303 | * Return 0 on success else a negative value. |
55cc08a6 | 2304 | */ |
7972aab2 DG |
2305 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2306 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2307 | { |
7972aab2 | 2308 | int ret; |
55cc08a6 | 2309 | |
7972aab2 DG |
2310 | assert(reg_sess); |
2311 | assert(reg_chan); | |
2312 | assert(ua_chan); | |
2313 | assert(ua_chan->obj); | |
55cc08a6 | 2314 | |
7972aab2 | 2315 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2316 | |
7972aab2 DG |
2317 | /* Setup all streams for the registry. */ |
2318 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2319 | if (ret < 0) { | |
55cc08a6 DG |
2320 | goto error; |
2321 | } | |
2322 | ||
7972aab2 DG |
2323 | reg_chan->obj.ust = ua_chan->obj; |
2324 | ua_chan->obj = NULL; | |
55cc08a6 | 2325 | |
7972aab2 | 2326 | return 0; |
55cc08a6 DG |
2327 | |
2328 | error: | |
7972aab2 DG |
2329 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2330 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2331 | return ret; |
2332 | } | |
2333 | ||
edb67388 | 2334 | /* |
7972aab2 | 2335 | * Send buffer registry channel to the application. |
d0b96690 | 2336 | * |
7972aab2 | 2337 | * Return 0 on success else a negative value. |
edb67388 | 2338 | */ |
7972aab2 DG |
2339 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2340 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2341 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2342 | { |
2343 | int ret; | |
7972aab2 | 2344 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2345 | |
7972aab2 DG |
2346 | assert(reg_chan); |
2347 | assert(app); | |
2348 | assert(ua_sess); | |
2349 | assert(ua_chan); | |
2350 | ||
2351 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2352 | ||
2353 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2354 | if (ret < 0) { |
2355 | goto error; | |
2356 | } | |
2357 | ||
7972aab2 DG |
2358 | /* Send channel to the application. */ |
2359 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2360 | if (ret < 0) { | |
2361 | goto error; | |
2362 | } | |
2363 | ||
2364 | health_code_update(); | |
2365 | ||
2366 | /* Send all streams to application. */ | |
2367 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2368 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2369 | struct ust_app_stream stream; | |
2370 | ||
2371 | ret = duplicate_stream_object(reg_stream, &stream); | |
2372 | if (ret < 0) { | |
2373 | goto error_stream_unlock; | |
2374 | } | |
2375 | ||
2376 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2377 | if (ret < 0) { | |
8c067051 | 2378 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2379 | goto error_stream_unlock; |
2380 | } | |
edb67388 | 2381 | |
7972aab2 DG |
2382 | /* |
2383 | * The return value is not important here. This function will output an | |
2384 | * error if needed. | |
2385 | */ | |
2386 | (void) release_ust_app_stream(-1, &stream); | |
2387 | } | |
2388 | ua_chan->is_sent = 1; | |
2389 | ||
2390 | error_stream_unlock: | |
2391 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2392 | error: |
2393 | return ret; | |
2394 | } | |
2395 | ||
9730260e | 2396 | /* |
7972aab2 DG |
2397 | * Create and send to the application the created buffers with per UID buffers. |
2398 | * | |
2399 | * Return 0 on success else a negative value. | |
9730260e | 2400 | */ |
7972aab2 DG |
2401 | static int create_channel_per_uid(struct ust_app *app, |
2402 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2403 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2404 | { |
2405 | int ret; | |
7972aab2 DG |
2406 | struct buffer_reg_uid *reg_uid; |
2407 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2408 | |
7972aab2 DG |
2409 | assert(app); |
2410 | assert(usess); | |
2411 | assert(ua_sess); | |
2412 | assert(ua_chan); | |
2413 | ||
2414 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2415 | ||
2416 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2417 | /* | |
2418 | * The session creation handles the creation of this global registry | |
2419 | * object. If none can be find, there is a code flow problem or a | |
2420 | * teardown race. | |
2421 | */ | |
2422 | assert(reg_uid); | |
2423 | ||
2424 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2425 | reg_uid); | |
2426 | if (!reg_chan) { | |
2427 | /* Create the buffer registry channel object. */ | |
2428 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2429 | if (ret < 0) { | |
2430 | goto error; | |
2431 | } | |
2432 | assert(reg_chan); | |
2433 | ||
2434 | /* | |
2435 | * Create the buffers on the consumer side. This call populates the | |
2436 | * ust app channel object with all streams and data object. | |
2437 | */ | |
2438 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2439 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2440 | if (ret < 0) { | |
07d2ae95 DG |
2441 | /* |
2442 | * Let's remove the previously created buffer registry channel so | |
2443 | * it's not visible anymore in the session registry. | |
2444 | */ | |
2445 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2446 | ua_chan->tracing_channel_id); | |
2447 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2448 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2449 | goto error; |
2450 | } | |
2451 | ||
2452 | /* | |
2453 | * Setup the streams and add it to the session registry. | |
2454 | */ | |
2455 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2456 | if (ret < 0) { | |
2457 | goto error; | |
2458 | } | |
2459 | ||
2460 | } | |
2461 | ||
2462 | /* Send buffers to the application. */ | |
2463 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2464 | if (ret < 0) { |
2465 | goto error; | |
2466 | } | |
2467 | ||
9730260e DG |
2468 | error: |
2469 | return ret; | |
2470 | } | |
2471 | ||
78f0bacd | 2472 | /* |
7972aab2 DG |
2473 | * Create and send to the application the created buffers with per PID buffers. |
2474 | * | |
2475 | * Return 0 on success else a negative value. | |
78f0bacd | 2476 | */ |
7972aab2 DG |
2477 | static int create_channel_per_pid(struct ust_app *app, |
2478 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2479 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2480 | { |
8535a6d9 | 2481 | int ret; |
7972aab2 | 2482 | struct ust_registry_session *registry; |
78f0bacd | 2483 | |
7972aab2 DG |
2484 | assert(app); |
2485 | assert(usess); | |
2486 | assert(ua_sess); | |
2487 | assert(ua_chan); | |
2488 | ||
2489 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2490 | ||
2491 | rcu_read_lock(); | |
2492 | ||
2493 | registry = get_session_registry(ua_sess); | |
2494 | assert(registry); | |
2495 | ||
2496 | /* Create and add a new channel registry to session. */ | |
2497 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2498 | if (ret < 0) { |
2499 | goto error; | |
2500 | } | |
2501 | ||
7972aab2 DG |
2502 | /* Create and get channel on the consumer side. */ |
2503 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2504 | app->bits_per_long, registry); | |
2505 | if (ret < 0) { | |
2506 | goto error; | |
2507 | } | |
2508 | ||
2509 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2510 | if (ret < 0) { | |
2511 | goto error; | |
2512 | } | |
8535a6d9 | 2513 | |
78f0bacd | 2514 | error: |
7972aab2 | 2515 | rcu_read_unlock(); |
78f0bacd DG |
2516 | return ret; |
2517 | } | |
2518 | ||
2519 | /* | |
7972aab2 DG |
2520 | * From an already allocated ust app channel, create the channel buffers if |
2521 | * need and send it to the application. This MUST be called with a RCU read | |
2522 | * side lock acquired. | |
2523 | * | |
2524 | * Return 0 on success or else a negative value. | |
78f0bacd | 2525 | */ |
7972aab2 DG |
2526 | static int do_create_channel(struct ust_app *app, |
2527 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2528 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2529 | { |
7972aab2 | 2530 | int ret; |
78f0bacd | 2531 | |
7972aab2 DG |
2532 | assert(app); |
2533 | assert(usess); | |
2534 | assert(ua_sess); | |
2535 | assert(ua_chan); | |
2536 | ||
2537 | /* Handle buffer type before sending the channel to the application. */ | |
2538 | switch (usess->buffer_type) { | |
2539 | case LTTNG_BUFFER_PER_UID: | |
2540 | { | |
2541 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2542 | if (ret < 0) { | |
2543 | goto error; | |
2544 | } | |
2545 | break; | |
2546 | } | |
2547 | case LTTNG_BUFFER_PER_PID: | |
2548 | { | |
2549 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2550 | if (ret < 0) { | |
2551 | goto error; | |
2552 | } | |
2553 | break; | |
2554 | } | |
2555 | default: | |
2556 | assert(0); | |
2557 | ret = -EINVAL; | |
78f0bacd DG |
2558 | goto error; |
2559 | } | |
2560 | ||
7972aab2 DG |
2561 | /* Initialize ust objd object using the received handle and add it. */ |
2562 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2563 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2564 | |
7972aab2 DG |
2565 | /* If channel is not enabled, disable it on the tracer */ |
2566 | if (!ua_chan->enabled) { | |
2567 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2568 | if (ret < 0) { | |
2569 | goto error; | |
2570 | } | |
78f0bacd DG |
2571 | } |
2572 | ||
2573 | error: | |
2574 | return ret; | |
2575 | } | |
2576 | ||
284d8f55 | 2577 | /* |
4d710ac2 DG |
2578 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2579 | * newly created channel if not NULL. | |
d0b96690 | 2580 | * |
36b588ed | 2581 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2582 | * |
2583 | * Return 0 on success or else a negative value. | |
284d8f55 | 2584 | */ |
4d710ac2 DG |
2585 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2586 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2587 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2588 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2589 | { |
2590 | int ret = 0; | |
bec39940 DG |
2591 | struct lttng_ht_iter iter; |
2592 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2593 | struct ust_app_channel *ua_chan; |
2594 | ||
2595 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2596 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2597 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2598 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2599 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2600 | goto end; |
5b4a0ec0 DG |
2601 | } |
2602 | ||
d0b96690 | 2603 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2604 | if (ua_chan == NULL) { |
2605 | /* Only malloc can fail here */ | |
4d710ac2 | 2606 | ret = -ENOMEM; |
094d1690 | 2607 | goto error_alloc; |
fc34caaa DG |
2608 | } |
2609 | shadow_copy_channel(ua_chan, uchan); | |
2610 | ||
ffe60014 DG |
2611 | /* Set channel type. */ |
2612 | ua_chan->attr.type = type; | |
2613 | ||
7972aab2 | 2614 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2615 | if (ret < 0) { |
2616 | goto error; | |
2617 | } | |
2618 | ||
fc34caaa | 2619 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2620 | app->pid); |
fc34caaa | 2621 | |
d0b96690 DG |
2622 | /* Only add the channel if successful on the tracer side. */ |
2623 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2624 | ||
fc34caaa | 2625 | end: |
4d710ac2 DG |
2626 | if (ua_chanp) { |
2627 | *ua_chanp = ua_chan; | |
2628 | } | |
2629 | ||
2630 | /* Everything went well. */ | |
2631 | return 0; | |
5b4a0ec0 DG |
2632 | |
2633 | error: | |
d0b96690 | 2634 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2635 | error_alloc: |
4d710ac2 | 2636 | return ret; |
5b4a0ec0 DG |
2637 | } |
2638 | ||
2639 | /* | |
2640 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2641 | * |
2642 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2643 | */ |
edb67388 DG |
2644 | static |
2645 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2646 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2647 | struct ust_app *app) | |
284d8f55 | 2648 | { |
edb67388 | 2649 | int ret = 0; |
5b4a0ec0 | 2650 | struct ust_app_event *ua_event; |
284d8f55 | 2651 | |
5b4a0ec0 | 2652 | /* Get event node */ |
18eace3b | 2653 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 2654 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 2655 | if (ua_event != NULL) { |
fc34caaa | 2656 | ret = -EEXIST; |
edb67388 DG |
2657 | goto end; |
2658 | } | |
5b4a0ec0 | 2659 | |
edb67388 DG |
2660 | /* Does not exist so create one */ |
2661 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2662 | if (ua_event == NULL) { | |
2663 | /* Only malloc can failed so something is really wrong */ | |
2664 | ret = -ENOMEM; | |
fc34caaa | 2665 | goto end; |
5b4a0ec0 | 2666 | } |
edb67388 | 2667 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2668 | |
edb67388 | 2669 | /* Create it on the tracer side */ |
5b4a0ec0 | 2670 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2671 | if (ret < 0) { |
fc34caaa | 2672 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2673 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2674 | goto error; |
2675 | } | |
2676 | ||
d0b96690 | 2677 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2678 | |
fc34caaa | 2679 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2680 | app->pid); |
7f79d3a1 | 2681 | |
edb67388 | 2682 | end: |
fc34caaa DG |
2683 | return ret; |
2684 | ||
5b4a0ec0 | 2685 | error: |
fc34caaa DG |
2686 | /* Valid. Calling here is already in a read side lock */ |
2687 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2688 | return ret; |
5b4a0ec0 DG |
2689 | } |
2690 | ||
2691 | /* | |
2692 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2693 | * |
7972aab2 | 2694 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2695 | */ |
2696 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
d65d2de8 DG |
2697 | struct ust_app *app, struct consumer_output *consumer, |
2698 | struct ustctl_consumer_channel_attr *attr) | |
5b4a0ec0 DG |
2699 | { |
2700 | int ret = 0; | |
ffe60014 | 2701 | struct ust_app_channel *metadata; |
d88aee68 | 2702 | struct consumer_socket *socket; |
7972aab2 | 2703 | struct ust_registry_session *registry; |
5b4a0ec0 | 2704 | |
ffe60014 DG |
2705 | assert(ua_sess); |
2706 | assert(app); | |
d88aee68 | 2707 | assert(consumer); |
5b4a0ec0 | 2708 | |
7972aab2 DG |
2709 | registry = get_session_registry(ua_sess); |
2710 | assert(registry); | |
2711 | ||
1b532a60 DG |
2712 | /* Metadata already exists for this registry or it was closed previously */ |
2713 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2714 | ret = 0; |
2715 | goto error; | |
5b4a0ec0 DG |
2716 | } |
2717 | ||
ffe60014 | 2718 | /* Allocate UST metadata */ |
d0b96690 | 2719 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2720 | if (!metadata) { |
2721 | /* malloc() failed */ | |
2722 | ret = -ENOMEM; | |
2723 | goto error; | |
2724 | } | |
5b4a0ec0 | 2725 | |
d65d2de8 DG |
2726 | if (!attr) { |
2727 | /* Set default attributes for metadata. */ | |
2728 | metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
2729 | metadata->attr.subbuf_size = default_get_metadata_subbuf_size(); | |
2730 | metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
0a9c6494 DG |
2731 | metadata->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER; |
2732 | metadata->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER; | |
d65d2de8 DG |
2733 | metadata->attr.output = LTTNG_UST_MMAP; |
2734 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2735 | } else { | |
2736 | memcpy(&metadata->attr, attr, sizeof(metadata->attr)); | |
2737 | metadata->attr.output = LTTNG_UST_MMAP; | |
2738 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2739 | } | |
5b4a0ec0 | 2740 | |
7972aab2 DG |
2741 | /* Need one fd for the channel. */ |
2742 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2743 | if (ret < 0) { | |
2744 | ERR("Exhausted number of available FD upon create metadata"); | |
2745 | goto error; | |
2746 | } | |
2747 | ||
4dc3dfc5 DG |
2748 | /* Get the right consumer socket for the application. */ |
2749 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2750 | if (!socket) { | |
2751 | ret = -EINVAL; | |
2752 | goto error_consumer; | |
2753 | } | |
2754 | ||
331744e3 JD |
2755 | /* |
2756 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2757 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2758 | * consumer requesting the metadata and the ask_channel call on our side | |
2759 | * did not returned yet. | |
2760 | */ | |
2761 | registry->metadata_key = metadata->key; | |
2762 | ||
d88aee68 DG |
2763 | /* |
2764 | * Ask the metadata channel creation to the consumer. The metadata object | |
2765 | * will be created by the consumer and kept their. However, the stream is | |
2766 | * never added or monitored until we do a first push metadata to the | |
2767 | * consumer. | |
2768 | */ | |
7972aab2 DG |
2769 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2770 | registry); | |
d88aee68 | 2771 | if (ret < 0) { |
f2a444f1 DG |
2772 | /* Nullify the metadata key so we don't try to close it later on. */ |
2773 | registry->metadata_key = 0; | |
d88aee68 DG |
2774 | goto error_consumer; |
2775 | } | |
2776 | ||
2777 | /* | |
2778 | * The setup command will make the metadata stream be sent to the relayd, | |
2779 | * if applicable, and the thread managing the metadatas. This is important | |
2780 | * because after this point, if an error occurs, the only way the stream | |
2781 | * can be deleted is to be monitored in the consumer. | |
2782 | */ | |
7972aab2 | 2783 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2784 | if (ret < 0) { |
f2a444f1 DG |
2785 | /* Nullify the metadata key so we don't try to close it later on. */ |
2786 | registry->metadata_key = 0; | |
d88aee68 | 2787 | goto error_consumer; |
5b4a0ec0 DG |
2788 | } |
2789 | ||
7972aab2 DG |
2790 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2791 | metadata->key, app->pid); | |
5b4a0ec0 | 2792 | |
d88aee68 | 2793 | error_consumer: |
b80f0b6c | 2794 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2795 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2796 | error: |
ffe60014 | 2797 | return ret; |
5b4a0ec0 DG |
2798 | } |
2799 | ||
2800 | /* | |
2801 | * Return pointer to traceable apps list. | |
2802 | */ | |
bec39940 | 2803 | struct lttng_ht *ust_app_get_ht(void) |
5b4a0ec0 DG |
2804 | { |
2805 | return ust_app_ht; | |
2806 | } | |
2807 | ||
2808 | /* | |
d88aee68 DG |
2809 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2810 | * acquired before calling this function. | |
5b4a0ec0 DG |
2811 | */ |
2812 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2813 | { | |
d88aee68 | 2814 | struct ust_app *app = NULL; |
bec39940 DG |
2815 | struct lttng_ht_node_ulong *node; |
2816 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2817 | |
bec39940 DG |
2818 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2819 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2820 | if (node == NULL) { |
2821 | DBG2("UST app no found with pid %d", pid); | |
2822 | goto error; | |
2823 | } | |
5b4a0ec0 DG |
2824 | |
2825 | DBG2("Found UST app by pid %d", pid); | |
2826 | ||
d88aee68 | 2827 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2828 | |
2829 | error: | |
d88aee68 | 2830 | return app; |
5b4a0ec0 DG |
2831 | } |
2832 | ||
d88aee68 DG |
2833 | /* |
2834 | * Allocate and init an UST app object using the registration information and | |
2835 | * the command socket. This is called when the command socket connects to the | |
2836 | * session daemon. | |
2837 | * | |
2838 | * The object is returned on success or else NULL. | |
2839 | */ | |
d0b96690 | 2840 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2841 | { |
d0b96690 DG |
2842 | struct ust_app *lta = NULL; |
2843 | ||
2844 | assert(msg); | |
2845 | assert(sock >= 0); | |
2846 | ||
2847 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2848 | |
173af62f DG |
2849 | if ((msg->bits_per_long == 64 && |
2850 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2851 | || (msg->bits_per_long == 32 && | |
2852 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2853 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2854 | "%d-bit long, but no consumerd for this size is available.\n", |
2855 | msg->name, msg->pid, msg->bits_per_long); | |
2856 | goto error; | |
3f2c5fcc | 2857 | } |
d0b96690 | 2858 | |
5b4a0ec0 DG |
2859 | lta = zmalloc(sizeof(struct ust_app)); |
2860 | if (lta == NULL) { | |
2861 | PERROR("malloc"); | |
d0b96690 | 2862 | goto error; |
5b4a0ec0 DG |
2863 | } |
2864 | ||
2865 | lta->ppid = msg->ppid; | |
2866 | lta->uid = msg->uid; | |
2867 | lta->gid = msg->gid; | |
d0b96690 | 2868 | |
7753dea8 | 2869 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2870 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2871 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2872 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2873 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2874 | lta->long_alignment = msg->long_alignment; | |
2875 | lta->byte_order = msg->byte_order; | |
2876 | ||
5b4a0ec0 DG |
2877 | lta->v_major = msg->major; |
2878 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 2879 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
2880 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2881 | lta->notify_sock = -1; | |
d88aee68 DG |
2882 | |
2883 | /* Copy name and make sure it's NULL terminated. */ | |
2884 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2885 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2886 | ||
2887 | /* | |
2888 | * Before this can be called, when receiving the registration information, | |
2889 | * the application compatibility is checked. So, at this point, the | |
2890 | * application can work with this session daemon. | |
2891 | */ | |
d0b96690 | 2892 | lta->compatible = 1; |
5b4a0ec0 | 2893 | |
852d0037 | 2894 | lta->pid = msg->pid; |
d0b96690 | 2895 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2896 | lta->sock = sock; |
d0b96690 | 2897 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2898 | |
d42f20df DG |
2899 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2900 | ||
d0b96690 DG |
2901 | error: |
2902 | return lta; | |
2903 | } | |
2904 | ||
d88aee68 DG |
2905 | /* |
2906 | * For a given application object, add it to every hash table. | |
2907 | */ | |
d0b96690 DG |
2908 | void ust_app_add(struct ust_app *app) |
2909 | { | |
2910 | assert(app); | |
2911 | assert(app->notify_sock >= 0); | |
2912 | ||
5b4a0ec0 | 2913 | rcu_read_lock(); |
852d0037 DG |
2914 | |
2915 | /* | |
2916 | * On a re-registration, we want to kick out the previous registration of | |
2917 | * that pid | |
2918 | */ | |
d0b96690 | 2919 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
2920 | |
2921 | /* | |
2922 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
2923 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
2924 | * already in the table. | |
2925 | */ | |
d0b96690 | 2926 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 2927 | |
d0b96690 DG |
2928 | /* Add application to the notify socket hash table. */ |
2929 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
2930 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 2931 | |
d0b96690 | 2932 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
2933 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
2934 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
2935 | app->v_minor); | |
5b4a0ec0 | 2936 | |
d0b96690 DG |
2937 | rcu_read_unlock(); |
2938 | } | |
2939 | ||
d88aee68 DG |
2940 | /* |
2941 | * Set the application version into the object. | |
2942 | * | |
2943 | * Return 0 on success else a negative value either an errno code or a | |
2944 | * LTTng-UST error code. | |
2945 | */ | |
d0b96690 DG |
2946 | int ust_app_version(struct ust_app *app) |
2947 | { | |
d88aee68 DG |
2948 | int ret; |
2949 | ||
d0b96690 | 2950 | assert(app); |
d88aee68 DG |
2951 | |
2952 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2953 | if (ret < 0) { | |
2954 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2955 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2956 | } else { | |
2957 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2958 | } | |
2959 | } | |
2960 | ||
2961 | return ret; | |
5b4a0ec0 DG |
2962 | } |
2963 | ||
2964 | /* | |
2965 | * Unregister app by removing it from the global traceable app list and freeing | |
2966 | * the data struct. | |
2967 | * | |
2968 | * The socket is already closed at this point so no close to sock. | |
2969 | */ | |
2970 | void ust_app_unregister(int sock) | |
2971 | { | |
2972 | struct ust_app *lta; | |
bec39940 DG |
2973 | struct lttng_ht_node_ulong *node; |
2974 | struct lttng_ht_iter iter; | |
d42f20df | 2975 | struct ust_app_session *ua_sess; |
525b0740 | 2976 | int ret; |
5b4a0ec0 DG |
2977 | |
2978 | rcu_read_lock(); | |
886459c6 | 2979 | |
5b4a0ec0 | 2980 | /* Get the node reference for a call_rcu */ |
852d0037 | 2981 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 2982 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 2983 | assert(node); |
284d8f55 | 2984 | |
852d0037 | 2985 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
2986 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
2987 | ||
886459c6 | 2988 | /* Remove application from PID hash table */ |
852d0037 DG |
2989 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
2990 | assert(!ret); | |
2991 | ||
d88aee68 DG |
2992 | /* |
2993 | * Remove application from notify hash table. The thread handling the | |
2994 | * notify socket could have deleted the node so ignore on error because | |
2995 | * either way it's valid. The close of that socket is handled by the other | |
2996 | * thread. | |
2997 | */ | |
d0b96690 | 2998 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 2999 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 3000 | |
5b98a774 DG |
3001 | /* |
3002 | * Ignore return value since the node might have been removed before by an | |
3003 | * add replace during app registration because the PID can be reassigned by | |
3004 | * the OS. | |
3005 | */ | |
d0b96690 | 3006 | iter.iter.node = <a->pid_n.node; |
bec39940 | 3007 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
3008 | if (ret) { |
3009 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3010 | lta->pid); | |
3011 | } | |
852d0037 | 3012 | |
d42f20df DG |
3013 | /* Remove sessions so they are not visible during deletion.*/ |
3014 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
3015 | node.node) { | |
7972aab2 DG |
3016 | struct ust_registry_session *registry; |
3017 | ||
d42f20df DG |
3018 | ret = lttng_ht_del(lta->sessions, &iter); |
3019 | if (ret) { | |
3020 | /* The session was already removed so scheduled for teardown. */ | |
3021 | continue; | |
3022 | } | |
3023 | ||
3024 | /* | |
3025 | * Add session to list for teardown. This is safe since at this point we | |
3026 | * are the only one using this list. | |
3027 | */ | |
d88aee68 DG |
3028 | pthread_mutex_lock(&ua_sess->lock); |
3029 | ||
3030 | /* | |
3031 | * Normally, this is done in the delete session process which is | |
3032 | * executed in the call rcu below. However, upon registration we can't | |
3033 | * afford to wait for the grace period before pushing data or else the | |
3034 | * data pending feature can race between the unregistration and stop | |
3035 | * command where the data pending command is sent *before* the grace | |
3036 | * period ended. | |
3037 | * | |
3038 | * The close metadata below nullifies the metadata pointer in the | |
3039 | * session so the delete session will NOT push/close a second time. | |
3040 | */ | |
7972aab2 | 3041 | registry = get_session_registry(ua_sess); |
1b532a60 | 3042 | if (registry && !registry->metadata_closed) { |
7972aab2 DG |
3043 | /* Push metadata for application before freeing the application. */ |
3044 | (void) push_metadata(registry, ua_sess->consumer); | |
3045 | ||
3046 | /* | |
3047 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3048 | * metadata only on destroy trace session in this case. Also, the |
3049 | * previous push metadata could have flag the metadata registry to | |
3050 | * close so don't send a close command if closed. | |
7972aab2 | 3051 | */ |
1b532a60 DG |
3052 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
3053 | !registry->metadata_closed) { | |
7972aab2 DG |
3054 | /* And ask to close it for this session registry. */ |
3055 | (void) close_metadata(registry, ua_sess->consumer); | |
3056 | } | |
3057 | } | |
d88aee68 | 3058 | |
d42f20df | 3059 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 3060 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3061 | } |
3062 | ||
852d0037 DG |
3063 | /* Free memory */ |
3064 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3065 | ||
5b4a0ec0 DG |
3066 | rcu_read_unlock(); |
3067 | return; | |
284d8f55 DG |
3068 | } |
3069 | ||
3070 | /* | |
5b4a0ec0 | 3071 | * Return traceable_app_count |
284d8f55 | 3072 | */ |
5b4a0ec0 | 3073 | unsigned long ust_app_list_count(void) |
284d8f55 | 3074 | { |
5b4a0ec0 | 3075 | unsigned long count; |
284d8f55 | 3076 | |
5b4a0ec0 | 3077 | rcu_read_lock(); |
bec39940 | 3078 | count = lttng_ht_get_count(ust_app_ht); |
5b4a0ec0 | 3079 | rcu_read_unlock(); |
284d8f55 | 3080 | |
5b4a0ec0 | 3081 | return count; |
284d8f55 DG |
3082 | } |
3083 | ||
5b4a0ec0 DG |
3084 | /* |
3085 | * Fill events array with all events name of all registered apps. | |
3086 | */ | |
3087 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3088 | { |
5b4a0ec0 DG |
3089 | int ret, handle; |
3090 | size_t nbmem, count = 0; | |
bec39940 | 3091 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3092 | struct ust_app *app; |
c617c0c6 | 3093 | struct lttng_event *tmp_event; |
421cb601 | 3094 | |
5b4a0ec0 | 3095 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3096 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3097 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3098 | PERROR("zmalloc ust app events"); |
3099 | ret = -ENOMEM; | |
421cb601 DG |
3100 | goto error; |
3101 | } | |
3102 | ||
5b4a0ec0 | 3103 | rcu_read_lock(); |
421cb601 | 3104 | |
852d0037 | 3105 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3106 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3107 | |
840cb59c | 3108 | health_code_update(); |
86acf0da | 3109 | |
e0c7ec2b DG |
3110 | if (!app->compatible) { |
3111 | /* | |
3112 | * TODO: In time, we should notice the caller of this error by | |
3113 | * telling him that this is a version error. | |
3114 | */ | |
3115 | continue; | |
3116 | } | |
852d0037 | 3117 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3118 | if (handle < 0) { |
ffe60014 DG |
3119 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3120 | ERR("UST app list events getting handle failed for app pid %d", | |
3121 | app->pid); | |
3122 | } | |
5b4a0ec0 DG |
3123 | continue; |
3124 | } | |
421cb601 | 3125 | |
852d0037 | 3126 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3127 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3128 | /* Handle ustctl error. */ |
3129 | if (ret < 0) { | |
3130 | free(tmp_event); | |
3131 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3132 | ERR("UST app tp list get failed for app %d with ret %d", | |
3133 | app->sock, ret); | |
3134 | } else { | |
3135 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3136 | /* |
3137 | * This is normal behavior, an application can die during the | |
3138 | * creation process. Don't report an error so the execution can | |
3139 | * continue normally. Continue normal execution. | |
3140 | */ | |
3141 | break; | |
ffe60014 DG |
3142 | } |
3143 | goto rcu_error; | |
3144 | } | |
3145 | ||
840cb59c | 3146 | health_code_update(); |
815564d8 | 3147 | if (count >= nbmem) { |
d7b3776f | 3148 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3149 | void *ptr; |
3150 | ||
815564d8 MD |
3151 | DBG2("Reallocating event list from %zu to %zu entries", nbmem, |
3152 | 2 * nbmem); | |
3153 | nbmem *= 2; | |
c617c0c6 MD |
3154 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event)); |
3155 | if (ptr == NULL) { | |
5b4a0ec0 | 3156 | PERROR("realloc ust app events"); |
c617c0c6 | 3157 | free(tmp_event); |
5b4a0ec0 DG |
3158 | ret = -ENOMEM; |
3159 | goto rcu_error; | |
3160 | } | |
c617c0c6 | 3161 | tmp_event = ptr; |
5b4a0ec0 | 3162 | } |
c617c0c6 MD |
3163 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3164 | tmp_event[count].loglevel = uiter.loglevel; | |
3165 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3166 | tmp_event[count].pid = app->pid; | |
3167 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3168 | count++; |
421cb601 | 3169 | } |
421cb601 DG |
3170 | } |
3171 | ||
5b4a0ec0 | 3172 | ret = count; |
c617c0c6 | 3173 | *events = tmp_event; |
421cb601 | 3174 | |
5b4a0ec0 | 3175 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3176 | |
5b4a0ec0 DG |
3177 | rcu_error: |
3178 | rcu_read_unlock(); | |
421cb601 | 3179 | error: |
840cb59c | 3180 | health_code_update(); |
5b4a0ec0 | 3181 | return ret; |
421cb601 DG |
3182 | } |
3183 | ||
f37d259d MD |
3184 | /* |
3185 | * Fill events array with all events name of all registered apps. | |
3186 | */ | |
3187 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3188 | { | |
3189 | int ret, handle; | |
3190 | size_t nbmem, count = 0; | |
3191 | struct lttng_ht_iter iter; | |
3192 | struct ust_app *app; | |
c617c0c6 | 3193 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3194 | |
3195 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3196 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3197 | if (tmp_event == NULL) { | |
f37d259d MD |
3198 | PERROR("zmalloc ust app event fields"); |
3199 | ret = -ENOMEM; | |
3200 | goto error; | |
3201 | } | |
3202 | ||
3203 | rcu_read_lock(); | |
3204 | ||
3205 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3206 | struct lttng_ust_field_iter uiter; | |
3207 | ||
840cb59c | 3208 | health_code_update(); |
86acf0da | 3209 | |
f37d259d MD |
3210 | if (!app->compatible) { |
3211 | /* | |
3212 | * TODO: In time, we should notice the caller of this error by | |
3213 | * telling him that this is a version error. | |
3214 | */ | |
3215 | continue; | |
3216 | } | |
3217 | handle = ustctl_tracepoint_field_list(app->sock); | |
3218 | if (handle < 0) { | |
ffe60014 DG |
3219 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3220 | ERR("UST app list field getting handle failed for app pid %d", | |
3221 | app->pid); | |
3222 | } | |
f37d259d MD |
3223 | continue; |
3224 | } | |
3225 | ||
3226 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3227 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3228 | /* Handle ustctl error. */ |
3229 | if (ret < 0) { | |
3230 | free(tmp_event); | |
3231 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3232 | ERR("UST app tp list field failed for app %d with ret %d", | |
3233 | app->sock, ret); | |
3234 | } else { | |
3235 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3236 | /* |
3237 | * This is normal behavior, an application can die during the | |
3238 | * creation process. Don't report an error so the execution can | |
3239 | * continue normally. | |
3240 | */ | |
3241 | break; | |
ffe60014 DG |
3242 | } |
3243 | goto rcu_error; | |
3244 | } | |
3245 | ||
840cb59c | 3246 | health_code_update(); |
f37d259d | 3247 | if (count >= nbmem) { |
d7b3776f | 3248 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3249 | void *ptr; |
3250 | ||
f37d259d MD |
3251 | DBG2("Reallocating event field list from %zu to %zu entries", nbmem, |
3252 | 2 * nbmem); | |
3253 | nbmem *= 2; | |
c617c0c6 MD |
3254 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field)); |
3255 | if (ptr == NULL) { | |
f37d259d | 3256 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3257 | free(tmp_event); |
f37d259d MD |
3258 | ret = -ENOMEM; |
3259 | goto rcu_error; | |
3260 | } | |
c617c0c6 | 3261 | tmp_event = ptr; |
f37d259d | 3262 | } |
f37d259d | 3263 | |
c617c0c6 MD |
3264 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
3265 | tmp_event[count].type = uiter.type; | |
3266 | tmp_event[count].nowrite = uiter.nowrite; | |
f37d259d | 3267 | |
c617c0c6 MD |
3268 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3269 | tmp_event[count].event.loglevel = uiter.loglevel; | |
3270 | tmp_event[count].event.type = LTTNG_UST_TRACEPOINT; | |
3271 | tmp_event[count].event.pid = app->pid; | |
3272 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3273 | count++; |
3274 | } | |
3275 | } | |
3276 | ||
3277 | ret = count; | |
c617c0c6 | 3278 | *fields = tmp_event; |
f37d259d MD |
3279 | |
3280 | DBG2("UST app list event fields done (%zu events)", count); | |
3281 | ||
3282 | rcu_error: | |
3283 | rcu_read_unlock(); | |
3284 | error: | |
840cb59c | 3285 | health_code_update(); |
f37d259d MD |
3286 | return ret; |
3287 | } | |
3288 | ||
5b4a0ec0 DG |
3289 | /* |
3290 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3291 | * |
3292 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3293 | */ |
3294 | void ust_app_clean_list(void) | |
421cb601 | 3295 | { |
5b4a0ec0 | 3296 | int ret; |
659ed79f | 3297 | struct ust_app *app; |
bec39940 | 3298 | struct lttng_ht_iter iter; |
421cb601 | 3299 | |
5b4a0ec0 | 3300 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3301 | |
5b4a0ec0 | 3302 | rcu_read_lock(); |
421cb601 | 3303 | |
659ed79f | 3304 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3305 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3306 | assert(!ret); |
659ed79f | 3307 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3308 | } |
3309 | ||
852d0037 | 3310 | /* Cleanup socket hash table */ |
659ed79f DG |
3311 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3312 | sock_n.node) { | |
852d0037 | 3313 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3314 | assert(!ret); |
3315 | } | |
852d0037 | 3316 | |
d88aee68 DG |
3317 | /* Cleanup notify socket hash table */ |
3318 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3319 | notify_sock_n.node) { | |
3320 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3321 | assert(!ret); | |
3322 | } | |
36b588ed | 3323 | rcu_read_unlock(); |
d88aee68 | 3324 | |
bec39940 | 3325 | /* Destroy is done only when the ht is empty */ |
0b2dc8df MD |
3326 | ht_cleanup_push(ust_app_ht); |
3327 | ht_cleanup_push(ust_app_ht_by_sock); | |
3328 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
5b4a0ec0 DG |
3329 | } |
3330 | ||
3331 | /* | |
3332 | * Init UST app hash table. | |
3333 | */ | |
3334 | void ust_app_ht_alloc(void) | |
3335 | { | |
bec39940 | 3336 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3337 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3338 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3339 | } |
3340 | ||
78f0bacd DG |
3341 | /* |
3342 | * For a specific UST session, disable the channel for all registered apps. | |
3343 | */ | |
35a9059d | 3344 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3345 | struct ltt_ust_channel *uchan) |
3346 | { | |
3347 | int ret = 0; | |
bec39940 DG |
3348 | struct lttng_ht_iter iter; |
3349 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3350 | struct ust_app *app; |
3351 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3352 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3353 | |
3354 | if (usess == NULL || uchan == NULL) { | |
3355 | ERR("Disabling UST global channel with NULL values"); | |
3356 | ret = -1; | |
3357 | goto error; | |
3358 | } | |
3359 | ||
d9bf3ca4 | 3360 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3361 | uchan->name, usess->id); |
78f0bacd DG |
3362 | |
3363 | rcu_read_lock(); | |
3364 | ||
3365 | /* For every registered applications */ | |
852d0037 | 3366 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3367 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3368 | if (!app->compatible) { |
3369 | /* | |
3370 | * TODO: In time, we should notice the caller of this error by | |
3371 | * telling him that this is a version error. | |
3372 | */ | |
3373 | continue; | |
3374 | } | |
78f0bacd DG |
3375 | ua_sess = lookup_session_by_app(usess, app); |
3376 | if (ua_sess == NULL) { | |
3377 | continue; | |
3378 | } | |
3379 | ||
8535a6d9 | 3380 | /* Get channel */ |
bec39940 DG |
3381 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3382 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3383 | /* If the session if found for the app, the channel must be there */ |
3384 | assert(ua_chan_node); | |
3385 | ||
3386 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3387 | /* The channel must not be already disabled */ | |
3388 | assert(ua_chan->enabled == 1); | |
3389 | ||
3390 | /* Disable channel onto application */ | |
3391 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3392 | if (ret < 0) { |
3393 | /* XXX: We might want to report this error at some point... */ | |
3394 | continue; | |
3395 | } | |
3396 | } | |
3397 | ||
3398 | rcu_read_unlock(); | |
3399 | ||
3400 | error: | |
3401 | return ret; | |
3402 | } | |
3403 | ||
3404 | /* | |
3405 | * For a specific UST session, enable the channel for all registered apps. | |
3406 | */ | |
35a9059d | 3407 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3408 | struct ltt_ust_channel *uchan) |
3409 | { | |
3410 | int ret = 0; | |
bec39940 | 3411 | struct lttng_ht_iter iter; |
78f0bacd DG |
3412 | struct ust_app *app; |
3413 | struct ust_app_session *ua_sess; | |
3414 | ||
3415 | if (usess == NULL || uchan == NULL) { | |
3416 | ERR("Adding UST global channel to NULL values"); | |
3417 | ret = -1; | |
3418 | goto error; | |
3419 | } | |
3420 | ||
d9bf3ca4 | 3421 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3422 | uchan->name, usess->id); |
78f0bacd DG |
3423 | |
3424 | rcu_read_lock(); | |
3425 | ||
3426 | /* For every registered applications */ | |
852d0037 | 3427 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3428 | if (!app->compatible) { |
3429 | /* | |
3430 | * TODO: In time, we should notice the caller of this error by | |
3431 | * telling him that this is a version error. | |
3432 | */ | |
3433 | continue; | |
3434 | } | |
78f0bacd DG |
3435 | ua_sess = lookup_session_by_app(usess, app); |
3436 | if (ua_sess == NULL) { | |
3437 | continue; | |
3438 | } | |
3439 | ||
3440 | /* Enable channel onto application */ | |
3441 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3442 | if (ret < 0) { | |
3443 | /* XXX: We might want to report this error at some point... */ | |
3444 | continue; | |
3445 | } | |
3446 | } | |
3447 | ||
3448 | rcu_read_unlock(); | |
3449 | ||
3450 | error: | |
3451 | return ret; | |
3452 | } | |
3453 | ||
b0a40d28 DG |
3454 | /* |
3455 | * Disable an event in a channel and for a specific session. | |
3456 | */ | |
35a9059d DG |
3457 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3458 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3459 | { |
3460 | int ret = 0; | |
bec39940 DG |
3461 | struct lttng_ht_iter iter, uiter; |
3462 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3463 | struct ust_app *app; |
3464 | struct ust_app_session *ua_sess; | |
3465 | struct ust_app_channel *ua_chan; | |
3466 | struct ust_app_event *ua_event; | |
3467 | ||
3468 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3469 | "%s for session id %" PRIu64, |
3470 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3471 | |
3472 | rcu_read_lock(); | |
3473 | ||
3474 | /* For all registered applications */ | |
852d0037 | 3475 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3476 | if (!app->compatible) { |
3477 | /* | |
3478 | * TODO: In time, we should notice the caller of this error by | |
3479 | * telling him that this is a version error. | |
3480 | */ | |
3481 | continue; | |
3482 | } | |
b0a40d28 DG |
3483 | ua_sess = lookup_session_by_app(usess, app); |
3484 | if (ua_sess == NULL) { | |
3485 | /* Next app */ | |
3486 | continue; | |
3487 | } | |
3488 | ||
3489 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3490 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3491 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3492 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 3493 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3494 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3495 | continue; |
3496 | } | |
3497 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3498 | ||
bec39940 DG |
3499 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3500 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3501 | if (ua_event_node == NULL) { |
3502 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3503 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3504 | continue; |
3505 | } | |
3506 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3507 | ||
7f79d3a1 | 3508 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3509 | if (ret < 0) { |
3510 | /* XXX: Report error someday... */ | |
3511 | continue; | |
3512 | } | |
3513 | } | |
3514 | ||
3515 | rcu_read_unlock(); | |
3516 | ||
3517 | return ret; | |
3518 | } | |
3519 | ||
9730260e | 3520 | /* |
edb67388 | 3521 | * For a specific UST session and UST channel, the event for all |
9730260e DG |
3522 | * registered apps. |
3523 | */ | |
35a9059d | 3524 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
9730260e DG |
3525 | struct ltt_ust_channel *uchan) |
3526 | { | |
3527 | int ret = 0; | |
bec39940 DG |
3528 | struct lttng_ht_iter iter, uiter; |
3529 | struct lttng_ht_node_str *ua_chan_node; | |
9730260e DG |
3530 | struct ust_app *app; |
3531 | struct ust_app_session *ua_sess; | |
3532 | struct ust_app_channel *ua_chan; | |
3533 | struct ust_app_event *ua_event; | |
3534 | ||
3535 | DBG("UST app disabling all event for all apps in channel " | |
d9bf3ca4 | 3536 | "%s for session id %" PRIu64, uchan->name, usess->id); |
9730260e DG |
3537 | |
3538 | rcu_read_lock(); | |
3539 | ||
3540 | /* For all registered applications */ | |
852d0037 | 3541 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3542 | if (!app->compatible) { |
3543 | /* | |
3544 | * TODO: In time, we should notice the caller of this error by | |
3545 | * telling him that this is a version error. | |
3546 | */ | |
3547 | continue; | |
3548 | } | |
9730260e | 3549 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3550 | if (!ua_sess) { |
3551 | /* The application has problem or is probably dead. */ | |
3552 | continue; | |
3553 | } | |
9730260e DG |
3554 | |
3555 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3556 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3557 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3558 | /* If the channel is not found, there is a code flow error */ |
3559 | assert(ua_chan_node); | |
3560 | ||
9730260e DG |
3561 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3562 | ||
3563 | /* Disable each events of channel */ | |
bec39940 DG |
3564 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3565 | node.node) { | |
7f79d3a1 | 3566 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
9730260e DG |
3567 | if (ret < 0) { |
3568 | /* XXX: Report error someday... */ | |
3569 | continue; | |
3570 | } | |
3571 | } | |
3572 | } | |
3573 | ||
3574 | rcu_read_unlock(); | |
3575 | ||
3576 | return ret; | |
3577 | } | |
3578 | ||
421cb601 | 3579 | /* |
5b4a0ec0 | 3580 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3581 | */ |
35a9059d | 3582 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3583 | struct ltt_ust_channel *uchan) |
3584 | { | |
3d8ca23b | 3585 | int ret = 0, created; |
bec39940 | 3586 | struct lttng_ht_iter iter; |
48842b30 | 3587 | struct ust_app *app; |
3d8ca23b | 3588 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3589 | |
fc34caaa DG |
3590 | /* Very wrong code flow */ |
3591 | assert(usess); | |
3592 | assert(uchan); | |
421cb601 | 3593 | |
d9bf3ca4 | 3594 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3595 | uchan->name, usess->id); |
48842b30 DG |
3596 | |
3597 | rcu_read_lock(); | |
421cb601 | 3598 | |
5b4a0ec0 | 3599 | /* For every registered applications */ |
852d0037 | 3600 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3601 | if (!app->compatible) { |
3602 | /* | |
3603 | * TODO: In time, we should notice the caller of this error by | |
3604 | * telling him that this is a version error. | |
3605 | */ | |
3606 | continue; | |
3607 | } | |
edb67388 DG |
3608 | /* |
3609 | * Create session on the tracer side and add it to app session HT. Note | |
3610 | * that if session exist, it will simply return a pointer to the ust | |
3611 | * app session. | |
3612 | */ | |
3d8ca23b DG |
3613 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3614 | if (ret < 0) { | |
3615 | switch (ret) { | |
3616 | case -ENOTCONN: | |
3617 | /* | |
3618 | * The application's socket is not valid. Either a bad socket | |
3619 | * or a timeout on it. We can't inform the caller that for a | |
3620 | * specific app, the session failed so lets continue here. | |
3621 | */ | |
3622 | continue; | |
3623 | case -ENOMEM: | |
3624 | default: | |
3625 | goto error_rcu_unlock; | |
3626 | } | |
48842b30 | 3627 | } |
3d8ca23b | 3628 | assert(ua_sess); |
48842b30 | 3629 | |
d0b96690 | 3630 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3631 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3632 | sizeof(uchan->name))) { | |
3633 | struct ustctl_consumer_channel_attr attr; | |
3634 | copy_channel_attr_to_ustctl(&attr, &uchan->attr); | |
3635 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
3636 | &attr); | |
3637 | } else { | |
3638 | /* Create channel onto application. We don't need the chan ref. */ | |
3639 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3640 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3641 | } | |
d0b96690 | 3642 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3643 | if (ret < 0) { |
3644 | if (ret == -ENOMEM) { | |
3645 | /* No more memory is a fatal error. Stop right now. */ | |
3646 | goto error_rcu_unlock; | |
3647 | } | |
3648 | /* Cleanup the created session if it's the case. */ | |
3649 | if (created) { | |
d0b96690 | 3650 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3651 | } |
48842b30 | 3652 | } |
48842b30 | 3653 | } |
5b4a0ec0 | 3654 | |
95e047ff | 3655 | error_rcu_unlock: |
48842b30 | 3656 | rcu_read_unlock(); |
3c14c33f | 3657 | return ret; |
48842b30 DG |
3658 | } |
3659 | ||
5b4a0ec0 | 3660 | /* |
edb67388 | 3661 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3662 | */ |
35a9059d | 3663 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3664 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3665 | { | |
3666 | int ret = 0; | |
bec39940 | 3667 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3668 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3669 | struct ust_app *app; |
3670 | struct ust_app_session *ua_sess; | |
3671 | struct ust_app_channel *ua_chan; | |
3672 | struct ust_app_event *ua_event; | |
48842b30 | 3673 | |
d9bf3ca4 | 3674 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3675 | uevent->attr.name, usess->id); |
48842b30 | 3676 | |
edb67388 DG |
3677 | /* |
3678 | * NOTE: At this point, this function is called only if the session and | |
3679 | * channel passed are already created for all apps. and enabled on the | |
3680 | * tracer also. | |
3681 | */ | |
3682 | ||
48842b30 | 3683 | rcu_read_lock(); |
421cb601 DG |
3684 | |
3685 | /* For all registered applications */ | |
852d0037 | 3686 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3687 | if (!app->compatible) { |
3688 | /* | |
3689 | * TODO: In time, we should notice the caller of this error by | |
3690 | * telling him that this is a version error. | |
3691 | */ | |
3692 | continue; | |
3693 | } | |
edb67388 | 3694 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3695 | if (!ua_sess) { |
3696 | /* The application has problem or is probably dead. */ | |
3697 | continue; | |
3698 | } | |
ba767faf | 3699 | |
d0b96690 DG |
3700 | pthread_mutex_lock(&ua_sess->lock); |
3701 | ||
edb67388 | 3702 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3703 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3704 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3705 | /* If the channel is not found, there is a code flow error */ |
3706 | assert(ua_chan_node); | |
3707 | ||
3708 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3709 | ||
18eace3b DG |
3710 | /* Get event node */ |
3711 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 3712 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3713 | if (ua_event == NULL) { |
7f79d3a1 | 3714 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3715 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3716 | goto next_app; |
35a9059d | 3717 | } |
35a9059d DG |
3718 | |
3719 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3720 | if (ret < 0) { | |
d0b96690 | 3721 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3722 | goto error; |
48842b30 | 3723 | } |
d0b96690 DG |
3724 | next_app: |
3725 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3726 | } |
3727 | ||
7f79d3a1 | 3728 | error: |
edb67388 | 3729 | rcu_read_unlock(); |
edb67388 DG |
3730 | return ret; |
3731 | } | |
3732 | ||
3733 | /* | |
3734 | * For a specific existing UST session and UST channel, creates the event for | |
3735 | * all registered apps. | |
3736 | */ | |
35a9059d | 3737 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3738 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3739 | { | |
3740 | int ret = 0; | |
bec39940 DG |
3741 | struct lttng_ht_iter iter, uiter; |
3742 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3743 | struct ust_app *app; |
3744 | struct ust_app_session *ua_sess; | |
3745 | struct ust_app_channel *ua_chan; | |
3746 | ||
d9bf3ca4 | 3747 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3748 | uevent->attr.name, usess->id); |
edb67388 | 3749 | |
edb67388 DG |
3750 | rcu_read_lock(); |
3751 | ||
3752 | /* For all registered applications */ | |
852d0037 | 3753 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3754 | if (!app->compatible) { |
3755 | /* | |
3756 | * TODO: In time, we should notice the caller of this error by | |
3757 | * telling him that this is a version error. | |
3758 | */ | |
3759 | continue; | |
3760 | } | |
edb67388 | 3761 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3762 | if (!ua_sess) { |
3763 | /* The application has problem or is probably dead. */ | |
3764 | continue; | |
3765 | } | |
48842b30 | 3766 | |
d0b96690 | 3767 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3768 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3769 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3770 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3771 | /* If the channel is not found, there is a code flow error */ |
3772 | assert(ua_chan_node); | |
3773 | ||
48842b30 DG |
3774 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3775 | ||
edb67388 | 3776 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3777 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3778 | if (ret < 0) { |
49c336c1 | 3779 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3780 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3781 | break; | |
3782 | } | |
3783 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3784 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3785 | continue; |
48842b30 | 3786 | } |
48842b30 | 3787 | } |
5b4a0ec0 | 3788 | |
48842b30 DG |
3789 | rcu_read_unlock(); |
3790 | ||
3791 | return ret; | |
3792 | } | |
3793 | ||
5b4a0ec0 DG |
3794 | /* |
3795 | * Start tracing for a specific UST session and app. | |
3796 | */ | |
b34cbebf | 3797 | static |
421cb601 | 3798 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3799 | { |
3800 | int ret = 0; | |
48842b30 | 3801 | struct ust_app_session *ua_sess; |
48842b30 | 3802 | |
852d0037 | 3803 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3804 | |
509cbaf8 MD |
3805 | rcu_read_lock(); |
3806 | ||
e0c7ec2b DG |
3807 | if (!app->compatible) { |
3808 | goto end; | |
3809 | } | |
3810 | ||
421cb601 DG |
3811 | ua_sess = lookup_session_by_app(usess, app); |
3812 | if (ua_sess == NULL) { | |
d42f20df DG |
3813 | /* The session is in teardown process. Ignore and continue. */ |
3814 | goto end; | |
421cb601 | 3815 | } |
48842b30 | 3816 | |
d0b96690 DG |
3817 | pthread_mutex_lock(&ua_sess->lock); |
3818 | ||
aea829b3 DG |
3819 | /* Upon restart, we skip the setup, already done */ |
3820 | if (ua_sess->started) { | |
8be98f9a | 3821 | goto skip_setup; |
aea829b3 | 3822 | } |
8be98f9a | 3823 | |
a4b92340 DG |
3824 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3825 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3826 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3827 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3828 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3829 | if (ret < 0) { |
3830 | if (ret != -EEXIST) { | |
3831 | ERR("Trace directory creation error"); | |
d0b96690 | 3832 | goto error_unlock; |
421cb601 | 3833 | } |
173af62f | 3834 | } |
7753dea8 | 3835 | } |
aea829b3 | 3836 | |
d65d2de8 DG |
3837 | /* |
3838 | * Create the metadata for the application. This returns gracefully if a | |
3839 | * metadata was already set for the session. | |
3840 | */ | |
3841 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, NULL); | |
421cb601 | 3842 | if (ret < 0) { |
d0b96690 | 3843 | goto error_unlock; |
421cb601 | 3844 | } |
48842b30 | 3845 | |
840cb59c | 3846 | health_code_update(); |
86acf0da | 3847 | |
8be98f9a | 3848 | skip_setup: |
421cb601 | 3849 | /* This start the UST tracing */ |
852d0037 | 3850 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3851 | if (ret < 0) { |
ffe60014 DG |
3852 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3853 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3854 | app->pid, ret); | |
3855 | } else { | |
3856 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
3857 | /* |
3858 | * This is normal behavior, an application can die during the | |
3859 | * creation process. Don't report an error so the execution can | |
3860 | * continue normally. | |
3861 | */ | |
3862 | pthread_mutex_unlock(&ua_sess->lock); | |
3863 | goto end; | |
ffe60014 | 3864 | } |
d0b96690 | 3865 | goto error_unlock; |
421cb601 | 3866 | } |
5b4a0ec0 | 3867 | |
55c3953d DG |
3868 | /* Indicate that the session has been started once */ |
3869 | ua_sess->started = 1; | |
3870 | ||
d0b96690 DG |
3871 | pthread_mutex_unlock(&ua_sess->lock); |
3872 | ||
840cb59c | 3873 | health_code_update(); |
86acf0da | 3874 | |
421cb601 | 3875 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3876 | ret = ustctl_wait_quiescent(app->sock); |
3877 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3878 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3879 | app->pid, ret); | |
3880 | } | |
48842b30 | 3881 | |
e0c7ec2b DG |
3882 | end: |
3883 | rcu_read_unlock(); | |
840cb59c | 3884 | health_code_update(); |
421cb601 | 3885 | return 0; |
48842b30 | 3886 | |
d0b96690 DG |
3887 | error_unlock: |
3888 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3889 | rcu_read_unlock(); |
840cb59c | 3890 | health_code_update(); |
421cb601 DG |
3891 | return -1; |
3892 | } | |
48842b30 | 3893 | |
8be98f9a MD |
3894 | /* |
3895 | * Stop tracing for a specific UST session and app. | |
3896 | */ | |
b34cbebf | 3897 | static |
8be98f9a MD |
3898 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3899 | { | |
3900 | int ret = 0; | |
3901 | struct ust_app_session *ua_sess; | |
7972aab2 | 3902 | struct ust_registry_session *registry; |
8be98f9a | 3903 | |
852d0037 | 3904 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3905 | |
3906 | rcu_read_lock(); | |
3907 | ||
e0c7ec2b | 3908 | if (!app->compatible) { |
d88aee68 | 3909 | goto end_no_session; |
e0c7ec2b DG |
3910 | } |
3911 | ||
8be98f9a MD |
3912 | ua_sess = lookup_session_by_app(usess, app); |
3913 | if (ua_sess == NULL) { | |
d88aee68 | 3914 | goto end_no_session; |
8be98f9a MD |
3915 | } |
3916 | ||
d88aee68 DG |
3917 | pthread_mutex_lock(&ua_sess->lock); |
3918 | ||
9bc07046 DG |
3919 | /* |
3920 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3921 | * that was never started. It's possible since we can have a fail start |
3922 | * from either the application manager thread or the command thread. Simply | |
3923 | * indicate that this is a stop error. | |
9bc07046 | 3924 | */ |
f9dfc3d9 | 3925 | if (!ua_sess->started) { |
c45536e1 DG |
3926 | goto error_rcu_unlock; |
3927 | } | |
7db205b5 | 3928 | |
840cb59c | 3929 | health_code_update(); |
86acf0da | 3930 | |
9d6c7d3f | 3931 | /* This inhibits UST tracing */ |
852d0037 | 3932 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3933 | if (ret < 0) { |
ffe60014 DG |
3934 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3935 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3936 | app->pid, ret); | |
3937 | } else { | |
3938 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
3939 | /* |
3940 | * This is normal behavior, an application can die during the | |
3941 | * creation process. Don't report an error so the execution can | |
3942 | * continue normally. | |
3943 | */ | |
3944 | goto end_unlock; | |
ffe60014 | 3945 | } |
9d6c7d3f DG |
3946 | goto error_rcu_unlock; |
3947 | } | |
3948 | ||
840cb59c | 3949 | health_code_update(); |
86acf0da | 3950 | |
9d6c7d3f | 3951 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3952 | ret = ustctl_wait_quiescent(app->sock); |
3953 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3954 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3955 | app->pid, ret); | |
3956 | } | |
9d6c7d3f | 3957 | |
840cb59c | 3958 | health_code_update(); |
86acf0da | 3959 | |
b34cbebf MD |
3960 | registry = get_session_registry(ua_sess); |
3961 | assert(registry); | |
1b532a60 DG |
3962 | |
3963 | if (!registry->metadata_closed) { | |
3964 | /* Push metadata for application before freeing the application. */ | |
3965 | (void) push_metadata(registry, ua_sess->consumer); | |
3966 | } | |
b34cbebf | 3967 | |
3757b385 | 3968 | end_unlock: |
b34cbebf MD |
3969 | pthread_mutex_unlock(&ua_sess->lock); |
3970 | end_no_session: | |
3971 | rcu_read_unlock(); | |
3972 | health_code_update(); | |
3973 | return 0; | |
3974 | ||
3975 | error_rcu_unlock: | |
3976 | pthread_mutex_unlock(&ua_sess->lock); | |
3977 | rcu_read_unlock(); | |
3978 | health_code_update(); | |
3979 | return -1; | |
3980 | } | |
3981 | ||
3982 | /* | |
3983 | * Flush buffers for a specific UST session and app. | |
3984 | */ | |
3985 | static | |
3986 | int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
3987 | { | |
3988 | int ret = 0; | |
3989 | struct lttng_ht_iter iter; | |
3990 | struct ust_app_session *ua_sess; | |
3991 | struct ust_app_channel *ua_chan; | |
3992 | ||
3993 | DBG("Flushing buffers for ust app pid %d", app->pid); | |
3994 | ||
3995 | rcu_read_lock(); | |
3996 | ||
3997 | if (!app->compatible) { | |
3998 | goto end_no_session; | |
3999 | } | |
4000 | ||
4001 | ua_sess = lookup_session_by_app(usess, app); | |
4002 | if (ua_sess == NULL) { | |
4003 | goto end_no_session; | |
4004 | } | |
4005 | ||
4006 | pthread_mutex_lock(&ua_sess->lock); | |
4007 | ||
4008 | health_code_update(); | |
4009 | ||
9d6c7d3f | 4010 | /* Flushing buffers */ |
bec39940 DG |
4011 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4012 | node.node) { | |
840cb59c | 4013 | health_code_update(); |
ffe60014 | 4014 | assert(ua_chan->is_sent); |
852d0037 | 4015 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 4016 | if (ret < 0) { |
ffe60014 DG |
4017 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4018 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
4019 | app->pid, ua_chan->name, ret); | |
4020 | } else { | |
4021 | DBG3("UST app failed to flush %s. Application is dead.", | |
4022 | ua_chan->name); | |
3757b385 DG |
4023 | /* |
4024 | * This is normal behavior, an application can die during the | |
4025 | * creation process. Don't report an error so the execution can | |
4026 | * continue normally. | |
4027 | */ | |
ffe60014 | 4028 | } |
6d3686da DG |
4029 | /* Continuing flushing all buffers */ |
4030 | continue; | |
8be98f9a MD |
4031 | } |
4032 | } | |
8be98f9a | 4033 | |
840cb59c | 4034 | health_code_update(); |
86acf0da | 4035 | |
d88aee68 DG |
4036 | pthread_mutex_unlock(&ua_sess->lock); |
4037 | end_no_session: | |
7db205b5 | 4038 | rcu_read_unlock(); |
840cb59c | 4039 | health_code_update(); |
8be98f9a | 4040 | return 0; |
8be98f9a MD |
4041 | } |
4042 | ||
84cd17c6 MD |
4043 | /* |
4044 | * Destroy a specific UST session in apps. | |
4045 | */ | |
3353de95 | 4046 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4047 | { |
ffe60014 | 4048 | int ret; |
84cd17c6 | 4049 | struct ust_app_session *ua_sess; |
bec39940 | 4050 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4051 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4052 | |
852d0037 | 4053 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4054 | |
4055 | rcu_read_lock(); | |
4056 | ||
e0c7ec2b DG |
4057 | if (!app->compatible) { |
4058 | goto end; | |
4059 | } | |
4060 | ||
84cd17c6 | 4061 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4062 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4063 | if (node == NULL) { |
d42f20df DG |
4064 | /* Session is being or is deleted. */ |
4065 | goto end; | |
84cd17c6 MD |
4066 | } |
4067 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4068 | |
840cb59c | 4069 | health_code_update(); |
d0b96690 | 4070 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4071 | |
840cb59c | 4072 | health_code_update(); |
7db205b5 | 4073 | |
84cd17c6 | 4074 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4075 | ret = ustctl_wait_quiescent(app->sock); |
4076 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4077 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4078 | app->pid, ret); | |
4079 | } | |
e0c7ec2b DG |
4080 | end: |
4081 | rcu_read_unlock(); | |
840cb59c | 4082 | health_code_update(); |
84cd17c6 | 4083 | return 0; |
84cd17c6 MD |
4084 | } |
4085 | ||
5b4a0ec0 DG |
4086 | /* |
4087 | * Start tracing for the UST session. | |
4088 | */ | |
421cb601 DG |
4089 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4090 | { | |
4091 | int ret = 0; | |
bec39940 | 4092 | struct lttng_ht_iter iter; |
421cb601 | 4093 | struct ust_app *app; |
48842b30 | 4094 | |
421cb601 DG |
4095 | DBG("Starting all UST traces"); |
4096 | ||
4097 | rcu_read_lock(); | |
421cb601 | 4098 | |
852d0037 | 4099 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4100 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4101 | if (ret < 0) { |
5b4a0ec0 DG |
4102 | /* Continue to next apps even on error */ |
4103 | continue; | |
48842b30 | 4104 | } |
48842b30 | 4105 | } |
5b4a0ec0 | 4106 | |
48842b30 DG |
4107 | rcu_read_unlock(); |
4108 | ||
4109 | return 0; | |
4110 | } | |
487cf67c | 4111 | |
8be98f9a MD |
4112 | /* |
4113 | * Start tracing for the UST session. | |
4114 | */ | |
4115 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4116 | { | |
4117 | int ret = 0; | |
bec39940 | 4118 | struct lttng_ht_iter iter; |
8be98f9a MD |
4119 | struct ust_app *app; |
4120 | ||
4121 | DBG("Stopping all UST traces"); | |
4122 | ||
4123 | rcu_read_lock(); | |
4124 | ||
b34cbebf MD |
4125 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4126 | ret = ust_app_stop_trace(usess, app); | |
4127 | if (ret < 0) { | |
4128 | /* Continue to next apps even on error */ | |
4129 | continue; | |
4130 | } | |
4131 | } | |
4132 | ||
b0a5f0fb | 4133 | /* Flush buffers and push metadata (for UID buffers). */ |
b34cbebf MD |
4134 | switch (usess->buffer_type) { |
4135 | case LTTNG_BUFFER_PER_UID: | |
4136 | { | |
7972aab2 | 4137 | struct buffer_reg_uid *reg; |
b34cbebf MD |
4138 | |
4139 | /* Flush all per UID buffers associated to that session. */ | |
7972aab2 | 4140 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
b0a5f0fb | 4141 | struct ust_registry_session *ust_session_reg; |
7972aab2 DG |
4142 | struct buffer_reg_channel *reg_chan; |
4143 | struct consumer_socket *socket; | |
4144 | ||
4145 | /* Get consumer socket to use to push the metadata.*/ | |
4146 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4147 | usess->consumer); | |
4148 | if (!socket) { | |
4149 | /* Ignore request if no consumer is found for the session. */ | |
4150 | continue; | |
4151 | } | |
4152 | ||
4153 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4154 | reg_chan, node.node) { | |
4155 | /* | |
4156 | * The following call will print error values so the return | |
4157 | * code is of little importance because whatever happens, we | |
4158 | * have to try them all. | |
4159 | */ | |
4160 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4161 | } | |
b0a5f0fb MD |
4162 | |
4163 | ust_session_reg = reg->registry->reg.ust; | |
4164 | if (!ust_session_reg->metadata_closed) { | |
4165 | /* Push metadata. */ | |
4166 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4167 | } | |
7972aab2 | 4168 | } |
b0a5f0fb | 4169 | |
b34cbebf | 4170 | break; |
7972aab2 | 4171 | } |
b34cbebf MD |
4172 | case LTTNG_BUFFER_PER_PID: |
4173 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4174 | ret = ust_app_flush_trace(usess, app); | |
4175 | if (ret < 0) { | |
4176 | /* Continue to next apps even on error */ | |
4177 | continue; | |
4178 | } | |
8be98f9a | 4179 | } |
b34cbebf MD |
4180 | break; |
4181 | default: | |
4182 | assert(0); | |
4183 | break; | |
8be98f9a MD |
4184 | } |
4185 | ||
4186 | rcu_read_unlock(); | |
4187 | ||
4188 | return 0; | |
4189 | } | |
4190 | ||
84cd17c6 MD |
4191 | /* |
4192 | * Destroy app UST session. | |
4193 | */ | |
4194 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4195 | { | |
4196 | int ret = 0; | |
bec39940 | 4197 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4198 | struct ust_app *app; |
4199 | ||
4200 | DBG("Destroy all UST traces"); | |
4201 | ||
4202 | rcu_read_lock(); | |
4203 | ||
852d0037 | 4204 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4205 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4206 | if (ret < 0) { |
4207 | /* Continue to next apps even on error */ | |
4208 | continue; | |
4209 | } | |
4210 | } | |
4211 | ||
4212 | rcu_read_unlock(); | |
4213 | ||
4214 | return 0; | |
4215 | } | |
4216 | ||
5b4a0ec0 DG |
4217 | /* |
4218 | * Add channels/events from UST global domain to registered apps at sock. | |
4219 | */ | |
487cf67c DG |
4220 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4221 | { | |
55c54cce | 4222 | int ret = 0; |
31746f93 | 4223 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4224 | struct ust_app *app; |
3d8ca23b | 4225 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4226 | struct ust_app_channel *ua_chan; |
4227 | struct ust_app_event *ua_event; | |
727d5404 | 4228 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4229 | |
95e047ff | 4230 | assert(usess); |
ffe60014 | 4231 | assert(sock >= 0); |
1f3580c7 | 4232 | |
d9bf3ca4 | 4233 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4234 | usess->id); |
487cf67c | 4235 | |
284d8f55 DG |
4236 | rcu_read_lock(); |
4237 | ||
f20baf8e | 4238 | app = ust_app_find_by_sock(sock); |
487cf67c | 4239 | if (app == NULL) { |
d88aee68 DG |
4240 | /* |
4241 | * Application can be unregistered before so this is possible hence | |
4242 | * simply stopping the update. | |
4243 | */ | |
4244 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4245 | goto error; |
4246 | } | |
4247 | ||
e0c7ec2b DG |
4248 | if (!app->compatible) { |
4249 | goto error; | |
4250 | } | |
4251 | ||
3d8ca23b DG |
4252 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4253 | if (ret < 0) { | |
4254 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4255 | goto error; |
4256 | } | |
3d8ca23b | 4257 | assert(ua_sess); |
487cf67c | 4258 | |
d0b96690 DG |
4259 | pthread_mutex_lock(&ua_sess->lock); |
4260 | ||
284d8f55 | 4261 | /* |
d0b96690 | 4262 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4263 | * app session above made a shadow copy of the UST global domain from the |
4264 | * ltt ust session. | |
4265 | */ | |
bec39940 DG |
4266 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4267 | node.node) { | |
d65d2de8 DG |
4268 | /* |
4269 | * For a metadata channel, handle it differently. | |
4270 | */ | |
4271 | if (!strncmp(ua_chan->name, DEFAULT_METADATA_NAME, | |
4272 | sizeof(ua_chan->name))) { | |
4273 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
4274 | &ua_chan->attr); | |
c7a339aa DG |
4275 | if (ret < 0) { |
4276 | goto error_unlock; | |
4277 | } | |
d65d2de8 DG |
4278 | /* Remove it from the hash table and continue!. */ |
4279 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
4280 | assert(!ret); | |
4281 | delete_ust_app_channel(-1, ua_chan, app); | |
4282 | continue; | |
4283 | } else { | |
4284 | ret = do_create_channel(app, usess, ua_sess, ua_chan); | |
c7a339aa DG |
4285 | if (ret < 0) { |
4286 | /* | |
4287 | * Stop everything. On error, the application failed, no more | |
4288 | * file descriptor are available or ENOMEM so stopping here is | |
4289 | * the only thing we can do for now. | |
4290 | */ | |
4291 | goto error_unlock; | |
4292 | } | |
487cf67c DG |
4293 | } |
4294 | ||
31746f93 DG |
4295 | /* |
4296 | * Add context using the list so they are enabled in the same order the | |
4297 | * user added them. | |
4298 | */ | |
4299 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4300 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4301 | if (ret < 0) { | |
d0b96690 | 4302 | goto error_unlock; |
727d5404 DG |
4303 | } |
4304 | } | |
4305 | ||
4306 | ||
284d8f55 | 4307 | /* For each events */ |
bec39940 DG |
4308 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4309 | node.node) { | |
284d8f55 DG |
4310 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4311 | if (ret < 0) { | |
d0b96690 | 4312 | goto error_unlock; |
487cf67c | 4313 | } |
36dc12cc | 4314 | } |
487cf67c DG |
4315 | } |
4316 | ||
d0b96690 DG |
4317 | pthread_mutex_unlock(&ua_sess->lock); |
4318 | ||
36dc12cc | 4319 | if (usess->start_trace) { |
421cb601 | 4320 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4321 | if (ret < 0) { |
36dc12cc DG |
4322 | goto error; |
4323 | } | |
4324 | ||
852d0037 | 4325 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4326 | } |
4327 | ||
ffe60014 DG |
4328 | /* Everything went well at this point. */ |
4329 | rcu_read_unlock(); | |
4330 | return; | |
4331 | ||
d0b96690 DG |
4332 | error_unlock: |
4333 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4334 | error: |
ffe60014 | 4335 | if (ua_sess) { |
d0b96690 | 4336 | destroy_app_session(app, ua_sess); |
ffe60014 | 4337 | } |
487cf67c DG |
4338 | rcu_read_unlock(); |
4339 | return; | |
4340 | } | |
55cc08a6 DG |
4341 | |
4342 | /* | |
4343 | * Add context to a specific channel for global UST domain. | |
4344 | */ | |
4345 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4346 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4347 | { | |
4348 | int ret = 0; | |
bec39940 DG |
4349 | struct lttng_ht_node_str *ua_chan_node; |
4350 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4351 | struct ust_app_channel *ua_chan = NULL; |
4352 | struct ust_app_session *ua_sess; | |
4353 | struct ust_app *app; | |
4354 | ||
4355 | rcu_read_lock(); | |
4356 | ||
852d0037 | 4357 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4358 | if (!app->compatible) { |
4359 | /* | |
4360 | * TODO: In time, we should notice the caller of this error by | |
4361 | * telling him that this is a version error. | |
4362 | */ | |
4363 | continue; | |
4364 | } | |
55cc08a6 DG |
4365 | ua_sess = lookup_session_by_app(usess, app); |
4366 | if (ua_sess == NULL) { | |
4367 | continue; | |
4368 | } | |
4369 | ||
d0b96690 | 4370 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4371 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4372 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4373 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4374 | if (ua_chan_node == NULL) { |
d0b96690 | 4375 | goto next_app; |
55cc08a6 DG |
4376 | } |
4377 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4378 | node); | |
55cc08a6 DG |
4379 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4380 | if (ret < 0) { | |
d0b96690 | 4381 | goto next_app; |
55cc08a6 | 4382 | } |
d0b96690 DG |
4383 | next_app: |
4384 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4385 | } |
4386 | ||
55cc08a6 DG |
4387 | rcu_read_unlock(); |
4388 | return ret; | |
4389 | } | |
4390 | ||
76d45b40 DG |
4391 | /* |
4392 | * Enable event for a channel from a UST session for a specific PID. | |
4393 | */ | |
4394 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4395 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4396 | { | |
4397 | int ret = 0; | |
bec39940 | 4398 | struct lttng_ht_iter iter; |
18eace3b | 4399 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4400 | struct ust_app *app; |
4401 | struct ust_app_session *ua_sess; | |
4402 | struct ust_app_channel *ua_chan; | |
4403 | struct ust_app_event *ua_event; | |
4404 | ||
4405 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4406 | ||
4407 | rcu_read_lock(); | |
4408 | ||
4409 | app = ust_app_find_by_pid(pid); | |
4410 | if (app == NULL) { | |
4411 | ERR("UST app enable event per PID %d not found", pid); | |
4412 | ret = -1; | |
d0b96690 | 4413 | goto end; |
76d45b40 DG |
4414 | } |
4415 | ||
e0c7ec2b DG |
4416 | if (!app->compatible) { |
4417 | ret = 0; | |
d0b96690 | 4418 | goto end; |
e0c7ec2b DG |
4419 | } |
4420 | ||
76d45b40 | 4421 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4422 | if (!ua_sess) { |
4423 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4424 | ret = 0; |
4425 | goto end; | |
c4a1715b | 4426 | } |
76d45b40 | 4427 | |
d0b96690 | 4428 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4429 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4430 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4431 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4432 | /* If the channel is not found, there is a code flow error */ |
4433 | assert(ua_chan_node); | |
4434 | ||
4435 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4436 | ||
18eace3b | 4437 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 4438 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4439 | if (ua_event == NULL) { |
76d45b40 DG |
4440 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4441 | if (ret < 0) { | |
d0b96690 | 4442 | goto end_unlock; |
76d45b40 DG |
4443 | } |
4444 | } else { | |
76d45b40 DG |
4445 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4446 | if (ret < 0) { | |
d0b96690 | 4447 | goto end_unlock; |
76d45b40 DG |
4448 | } |
4449 | } | |
4450 | ||
d0b96690 DG |
4451 | end_unlock: |
4452 | pthread_mutex_unlock(&ua_sess->lock); | |
4453 | end: | |
76d45b40 DG |
4454 | rcu_read_unlock(); |
4455 | return ret; | |
4456 | } | |
7f79d3a1 DG |
4457 | |
4458 | /* | |
4459 | * Disable event for a channel from a UST session for a specific PID. | |
4460 | */ | |
4461 | int ust_app_disable_event_pid(struct ltt_ust_session *usess, | |
4462 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4463 | { | |
4464 | int ret = 0; | |
bec39940 DG |
4465 | struct lttng_ht_iter iter; |
4466 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
7f79d3a1 DG |
4467 | struct ust_app *app; |
4468 | struct ust_app_session *ua_sess; | |
4469 | struct ust_app_channel *ua_chan; | |
4470 | struct ust_app_event *ua_event; | |
4471 | ||
4472 | DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); | |
4473 | ||
4474 | rcu_read_lock(); | |
4475 | ||
4476 | app = ust_app_find_by_pid(pid); | |
4477 | if (app == NULL) { | |
4478 | ERR("UST app disable event per PID %d not found", pid); | |
4479 | ret = -1; | |
4480 | goto error; | |
4481 | } | |
4482 | ||
e0c7ec2b DG |
4483 | if (!app->compatible) { |
4484 | ret = 0; | |
4485 | goto error; | |
4486 | } | |
4487 | ||
7f79d3a1 | 4488 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4489 | if (!ua_sess) { |
4490 | /* The application has problem or is probably dead. */ | |
4491 | goto error; | |
4492 | } | |
7f79d3a1 DG |
4493 | |
4494 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4495 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4496 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4497 | if (ua_chan_node == NULL) { |
4498 | /* Channel does not exist, skip disabling */ | |
4499 | goto error; | |
4500 | } | |
4501 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4502 | ||
bec39940 DG |
4503 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); |
4504 | ua_event_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4505 | if (ua_event_node == NULL) { |
4506 | /* Event does not exist, skip disabling */ | |
4507 | goto error; | |
4508 | } | |
4509 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
4510 | ||
4511 | ret = disable_ust_app_event(ua_sess, ua_event, app); | |
4512 | if (ret < 0) { | |
4513 | goto error; | |
4514 | } | |
4515 | ||
4516 | error: | |
4517 | rcu_read_unlock(); | |
4518 | return ret; | |
4519 | } | |
e0c7ec2b | 4520 | |
4466912f DG |
4521 | /* |
4522 | * Calibrate registered applications. | |
4523 | */ | |
4524 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4525 | { | |
4526 | int ret = 0; | |
4527 | struct lttng_ht_iter iter; | |
4528 | struct ust_app *app; | |
4529 | ||
4530 | rcu_read_lock(); | |
4531 | ||
852d0037 | 4532 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4533 | if (!app->compatible) { |
4534 | /* | |
4535 | * TODO: In time, we should notice the caller of this error by | |
4536 | * telling him that this is a version error. | |
4537 | */ | |
4538 | continue; | |
4539 | } | |
4540 | ||
840cb59c | 4541 | health_code_update(); |
86acf0da | 4542 | |
852d0037 | 4543 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4544 | if (ret < 0) { |
4545 | switch (ret) { | |
4546 | case -ENOSYS: | |
4547 | /* Means that it's not implemented on the tracer side. */ | |
4548 | ret = 0; | |
4549 | break; | |
4550 | default: | |
4466912f | 4551 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4552 | app->pid, ret); |
4466912f DG |
4553 | break; |
4554 | } | |
4555 | } | |
4556 | } | |
4557 | ||
4558 | DBG("UST app global domain calibration finished"); | |
4559 | ||
4560 | rcu_read_unlock(); | |
4561 | ||
840cb59c | 4562 | health_code_update(); |
86acf0da | 4563 | |
4466912f DG |
4564 | return ret; |
4565 | } | |
d0b96690 DG |
4566 | |
4567 | /* | |
4568 | * Receive registration and populate the given msg structure. | |
4569 | * | |
4570 | * On success return 0 else a negative value returned by the ustctl call. | |
4571 | */ | |
4572 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4573 | { | |
4574 | int ret; | |
4575 | uint32_t pid, ppid, uid, gid; | |
4576 | ||
4577 | assert(msg); | |
4578 | ||
4579 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4580 | &pid, &ppid, &uid, &gid, | |
4581 | &msg->bits_per_long, | |
4582 | &msg->uint8_t_alignment, | |
4583 | &msg->uint16_t_alignment, | |
4584 | &msg->uint32_t_alignment, | |
4585 | &msg->uint64_t_alignment, | |
4586 | &msg->long_alignment, | |
4587 | &msg->byte_order, | |
4588 | msg->name); | |
4589 | if (ret < 0) { | |
4590 | switch (-ret) { | |
4591 | case EPIPE: | |
4592 | case ECONNRESET: | |
4593 | case LTTNG_UST_ERR_EXITING: | |
4594 | DBG3("UST app recv reg message failed. Application died"); | |
4595 | break; | |
4596 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4597 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4598 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4599 | LTTNG_UST_ABI_MINOR_VERSION); | |
4600 | break; | |
4601 | default: | |
4602 | ERR("UST app recv reg message failed with ret %d", ret); | |
4603 | break; | |
4604 | } | |
4605 | goto error; | |
4606 | } | |
4607 | msg->pid = (pid_t) pid; | |
4608 | msg->ppid = (pid_t) ppid; | |
4609 | msg->uid = (uid_t) uid; | |
4610 | msg->gid = (gid_t) gid; | |
4611 | ||
4612 | error: | |
4613 | return ret; | |
4614 | } | |
4615 | ||
d88aee68 DG |
4616 | /* |
4617 | * Return a ust app channel object using the application object and the channel | |
4618 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4619 | * lock MUST be acquired before calling this function. | |
4620 | */ | |
d0b96690 DG |
4621 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4622 | int objd) | |
4623 | { | |
4624 | struct lttng_ht_node_ulong *node; | |
4625 | struct lttng_ht_iter iter; | |
4626 | struct ust_app_channel *ua_chan = NULL; | |
4627 | ||
4628 | assert(app); | |
4629 | ||
4630 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4631 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4632 | if (node == NULL) { | |
4633 | DBG2("UST app channel find by objd %d not found", objd); | |
4634 | goto error; | |
4635 | } | |
4636 | ||
4637 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4638 | ||
4639 | error: | |
4640 | return ua_chan; | |
4641 | } | |
4642 | ||
d88aee68 DG |
4643 | /* |
4644 | * Reply to a register channel notification from an application on the notify | |
4645 | * socket. The channel metadata is also created. | |
4646 | * | |
4647 | * The session UST registry lock is acquired in this function. | |
4648 | * | |
4649 | * On success 0 is returned else a negative value. | |
4650 | */ | |
d0b96690 DG |
4651 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4652 | size_t nr_fields, struct ustctl_field *fields) | |
4653 | { | |
4654 | int ret, ret_code = 0; | |
4655 | uint32_t chan_id, reg_count; | |
7972aab2 | 4656 | uint64_t chan_reg_key; |
d0b96690 DG |
4657 | enum ustctl_channel_header type; |
4658 | struct ust_app *app; | |
4659 | struct ust_app_channel *ua_chan; | |
4660 | struct ust_app_session *ua_sess; | |
7972aab2 | 4661 | struct ust_registry_session *registry; |
45893984 | 4662 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4663 | |
4664 | rcu_read_lock(); | |
4665 | ||
4666 | /* Lookup application. If not found, there is a code flow error. */ | |
4667 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4668 | if (!app) { |
4669 | DBG("Application socket %d is being teardown. Abort event notify", | |
4670 | sock); | |
4671 | ret = 0; | |
d5d629b5 | 4672 | free(fields); |
d88aee68 DG |
4673 | goto error_rcu_unlock; |
4674 | } | |
d0b96690 | 4675 | |
4950b860 | 4676 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4677 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4678 | if (!ua_chan) { |
4679 | DBG("Application channel is being teardown. Abort event notify"); | |
4680 | ret = 0; | |
d5d629b5 | 4681 | free(fields); |
4950b860 MD |
4682 | goto error_rcu_unlock; |
4683 | } | |
4684 | ||
d0b96690 DG |
4685 | assert(ua_chan->session); |
4686 | ua_sess = ua_chan->session; | |
d0b96690 | 4687 | |
7972aab2 DG |
4688 | /* Get right session registry depending on the session buffer type. */ |
4689 | registry = get_session_registry(ua_sess); | |
4690 | assert(registry); | |
45893984 | 4691 | |
7972aab2 DG |
4692 | /* Depending on the buffer type, a different channel key is used. */ |
4693 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4694 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4695 | } else { |
7972aab2 | 4696 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4697 | } |
4698 | ||
7972aab2 DG |
4699 | pthread_mutex_lock(®istry->lock); |
4700 | ||
4701 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4702 | assert(chan_reg); | |
4703 | ||
4704 | if (!chan_reg->register_done) { | |
4705 | reg_count = ust_registry_get_event_count(chan_reg); | |
4706 | if (reg_count < 31) { | |
4707 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4708 | } else { | |
4709 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4710 | } | |
4711 | ||
4712 | chan_reg->nr_ctx_fields = nr_fields; | |
4713 | chan_reg->ctx_fields = fields; | |
4714 | chan_reg->header_type = type; | |
d0b96690 | 4715 | } else { |
7972aab2 DG |
4716 | /* Get current already assigned values. */ |
4717 | type = chan_reg->header_type; | |
d5d629b5 DG |
4718 | free(fields); |
4719 | /* Set to NULL so the error path does not do a double free. */ | |
4720 | fields = NULL; | |
d0b96690 | 4721 | } |
7972aab2 DG |
4722 | /* Channel id is set during the object creation. */ |
4723 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4724 | |
4725 | /* Append to metadata */ | |
7972aab2 DG |
4726 | if (!chan_reg->metadata_dumped) { |
4727 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4728 | if (ret_code) { |
4729 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4730 | goto reply; | |
4731 | } | |
4732 | } | |
4733 | ||
4734 | reply: | |
7972aab2 DG |
4735 | DBG3("UST app replying to register channel key %" PRIu64 |
4736 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4737 | ret_code); | |
d0b96690 DG |
4738 | |
4739 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4740 | if (ret < 0) { | |
4741 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4742 | ERR("UST app reply channel failed with ret %d", ret); | |
4743 | } else { | |
4744 | DBG3("UST app reply channel failed. Application died"); | |
4745 | } | |
4746 | goto error; | |
4747 | } | |
4748 | ||
7972aab2 DG |
4749 | /* This channel registry registration is completed. */ |
4750 | chan_reg->register_done = 1; | |
4751 | ||
d0b96690 | 4752 | error: |
7972aab2 | 4753 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4754 | error_rcu_unlock: |
d0b96690 | 4755 | rcu_read_unlock(); |
d5d629b5 DG |
4756 | if (ret) { |
4757 | free(fields); | |
4758 | } | |
d0b96690 DG |
4759 | return ret; |
4760 | } | |
4761 | ||
d88aee68 DG |
4762 | /* |
4763 | * Add event to the UST channel registry. When the event is added to the | |
4764 | * registry, the metadata is also created. Once done, this replies to the | |
4765 | * application with the appropriate error code. | |
4766 | * | |
4767 | * The session UST registry lock is acquired in the function. | |
4768 | * | |
4769 | * On success 0 is returned else a negative value. | |
4770 | */ | |
d0b96690 DG |
4771 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4772 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4773 | char *model_emf_uri) | |
4774 | { | |
4775 | int ret, ret_code; | |
4776 | uint32_t event_id = 0; | |
7972aab2 | 4777 | uint64_t chan_reg_key; |
d0b96690 DG |
4778 | struct ust_app *app; |
4779 | struct ust_app_channel *ua_chan; | |
4780 | struct ust_app_session *ua_sess; | |
7972aab2 | 4781 | struct ust_registry_session *registry; |
d0b96690 DG |
4782 | |
4783 | rcu_read_lock(); | |
4784 | ||
4785 | /* Lookup application. If not found, there is a code flow error. */ | |
4786 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4787 | if (!app) { |
4788 | DBG("Application socket %d is being teardown. Abort event notify", | |
4789 | sock); | |
4790 | ret = 0; | |
d5d629b5 DG |
4791 | free(sig); |
4792 | free(fields); | |
4793 | free(model_emf_uri); | |
d88aee68 DG |
4794 | goto error_rcu_unlock; |
4795 | } | |
d0b96690 | 4796 | |
4950b860 | 4797 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4798 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4799 | if (!ua_chan) { |
4800 | DBG("Application channel is being teardown. Abort event notify"); | |
4801 | ret = 0; | |
d5d629b5 DG |
4802 | free(sig); |
4803 | free(fields); | |
4804 | free(model_emf_uri); | |
4950b860 MD |
4805 | goto error_rcu_unlock; |
4806 | } | |
4807 | ||
d0b96690 DG |
4808 | assert(ua_chan->session); |
4809 | ua_sess = ua_chan->session; | |
4810 | ||
7972aab2 DG |
4811 | registry = get_session_registry(ua_sess); |
4812 | assert(registry); | |
4813 | ||
4814 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4815 | chan_reg_key = ua_chan->tracing_channel_id; | |
4816 | } else { | |
4817 | chan_reg_key = ua_chan->key; | |
4818 | } | |
4819 | ||
4820 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4821 | |
d5d629b5 DG |
4822 | /* |
4823 | * From this point on, this call acquires the ownership of the sig, fields | |
4824 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4825 | * three variables MUST NOT be read/write after this. | |
4826 | */ | |
7972aab2 | 4827 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4828 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
8494bda5 MD |
4829 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4830 | app); | |
d0b96690 DG |
4831 | |
4832 | /* | |
4833 | * The return value is returned to ustctl so in case of an error, the | |
4834 | * application can be notified. In case of an error, it's important not to | |
4835 | * return a negative error or else the application will get closed. | |
4836 | */ | |
4837 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4838 | if (ret < 0) { | |
4839 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4840 | ERR("UST app reply event failed with ret %d", ret); | |
4841 | } else { | |
4842 | DBG3("UST app reply event failed. Application died"); | |
4843 | } | |
4844 | /* | |
4845 | * No need to wipe the create event since the application socket will | |
4846 | * get close on error hence cleaning up everything by itself. | |
4847 | */ | |
4848 | goto error; | |
4849 | } | |
4850 | ||
7972aab2 DG |
4851 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4852 | name, event_id); | |
d88aee68 | 4853 | |
d0b96690 | 4854 | error: |
7972aab2 | 4855 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4856 | error_rcu_unlock: |
d0b96690 DG |
4857 | rcu_read_unlock(); |
4858 | return ret; | |
4859 | } | |
4860 | ||
d88aee68 DG |
4861 | /* |
4862 | * Handle application notification through the given notify socket. | |
4863 | * | |
4864 | * Return 0 on success or else a negative value. | |
4865 | */ | |
d0b96690 DG |
4866 | int ust_app_recv_notify(int sock) |
4867 | { | |
4868 | int ret; | |
4869 | enum ustctl_notify_cmd cmd; | |
4870 | ||
4871 | DBG3("UST app receiving notify from sock %d", sock); | |
4872 | ||
4873 | ret = ustctl_recv_notify(sock, &cmd); | |
4874 | if (ret < 0) { | |
4875 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4876 | ERR("UST app recv notify failed with ret %d", ret); | |
4877 | } else { | |
4878 | DBG3("UST app recv notify failed. Application died"); | |
4879 | } | |
4880 | goto error; | |
4881 | } | |
4882 | ||
4883 | switch (cmd) { | |
4884 | case USTCTL_NOTIFY_CMD_EVENT: | |
4885 | { | |
4886 | int sobjd, cobjd, loglevel; | |
4887 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4888 | size_t nr_fields; | |
4889 | struct ustctl_field *fields; | |
4890 | ||
4891 | DBG2("UST app ustctl register event received"); | |
4892 | ||
4893 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4894 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4895 | if (ret < 0) { | |
4896 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4897 | ERR("UST app recv event failed with ret %d", ret); | |
4898 | } else { | |
4899 | DBG3("UST app recv event failed. Application died"); | |
4900 | } | |
4901 | goto error; | |
4902 | } | |
4903 | ||
d5d629b5 DG |
4904 | /* |
4905 | * Add event to the UST registry coming from the notify socket. This | |
4906 | * call will free if needed the sig, fields and model_emf_uri. This | |
4907 | * code path loses the ownsership of these variables and transfer them | |
4908 | * to the this function. | |
4909 | */ | |
d0b96690 DG |
4910 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4911 | fields, loglevel, model_emf_uri); | |
4912 | if (ret < 0) { | |
4913 | goto error; | |
4914 | } | |
4915 | ||
4916 | break; | |
4917 | } | |
4918 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4919 | { | |
4920 | int sobjd, cobjd; | |
4921 | size_t nr_fields; | |
4922 | struct ustctl_field *fields; | |
4923 | ||
4924 | DBG2("UST app ustctl register channel received"); | |
4925 | ||
4926 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4927 | &fields); | |
4928 | if (ret < 0) { | |
4929 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4930 | ERR("UST app recv channel failed with ret %d", ret); | |
4931 | } else { | |
4932 | DBG3("UST app recv channel failed. Application died"); | |
4933 | } | |
4934 | goto error; | |
4935 | } | |
4936 | ||
d5d629b5 DG |
4937 | /* |
4938 | * The fields ownership are transfered to this function call meaning | |
4939 | * that if needed it will be freed. After this, it's invalid to access | |
4940 | * fields or clean it up. | |
4941 | */ | |
d0b96690 DG |
4942 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4943 | fields); | |
4944 | if (ret < 0) { | |
4945 | goto error; | |
4946 | } | |
4947 | ||
4948 | break; | |
4949 | } | |
4950 | default: | |
4951 | /* Should NEVER happen. */ | |
4952 | assert(0); | |
4953 | } | |
4954 | ||
4955 | error: | |
4956 | return ret; | |
4957 | } | |
d88aee68 DG |
4958 | |
4959 | /* | |
4960 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4961 | * corresponding application. On failure, the call_rcu to close the socket is | |
4962 | * executed. If an application is found, it tries to delete it from the notify | |
4963 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4964 | * | |
4965 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4966 | * call RCU is not done but the rest of the cleanup is. | |
4967 | */ | |
4968 | void ust_app_notify_sock_unregister(int sock) | |
4969 | { | |
4970 | int err_enomem = 0; | |
4971 | struct lttng_ht_iter iter; | |
4972 | struct ust_app *app; | |
4973 | struct ust_app_notify_sock_obj *obj; | |
4974 | ||
4975 | assert(sock >= 0); | |
4976 | ||
4977 | rcu_read_lock(); | |
4978 | ||
4979 | obj = zmalloc(sizeof(*obj)); | |
4980 | if (!obj) { | |
4981 | /* | |
4982 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4983 | * procedure but the call_rcu will not be called. In this case, we | |
4984 | * accept the fd leak rather than possibly creating an unsynchronized | |
4985 | * state between threads. | |
4986 | * | |
4987 | * TODO: The notify object should be created once the notify socket is | |
4988 | * registered and stored independantely from the ust app object. The | |
4989 | * tricky part is to synchronize the teardown of the application and | |
4990 | * this notify object. Let's keep that in mind so we can avoid this | |
4991 | * kind of shenanigans with ENOMEM in the teardown path. | |
4992 | */ | |
4993 | err_enomem = 1; | |
4994 | } else { | |
4995 | obj->fd = sock; | |
4996 | } | |
4997 | ||
4998 | DBG("UST app notify socket unregister %d", sock); | |
4999 | ||
5000 | /* | |
5001 | * Lookup application by notify socket. If this fails, this means that the | |
5002 | * hash table delete has already been done by the application | |
5003 | * unregistration process so we can safely close the notify socket in a | |
5004 | * call RCU. | |
5005 | */ | |
5006 | app = find_app_by_notify_sock(sock); | |
5007 | if (!app) { | |
5008 | goto close_socket; | |
5009 | } | |
5010 | ||
5011 | iter.iter.node = &app->notify_sock_n.node; | |
5012 | ||
5013 | /* | |
5014 | * Whatever happens here either we fail or succeed, in both cases we have | |
5015 | * to close the socket after a grace period to continue to the call RCU | |
5016 | * here. If the deletion is successful, the application is not visible | |
5017 | * anymore by other threads and is it fails it means that it was already | |
5018 | * deleted from the hash table so either way we just have to close the | |
5019 | * socket. | |
5020 | */ | |
5021 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5022 | ||
5023 | close_socket: | |
5024 | rcu_read_unlock(); | |
5025 | ||
5026 | /* | |
5027 | * Close socket after a grace period to avoid for the socket to be reused | |
5028 | * before the application object is freed creating potential race between | |
5029 | * threads trying to add unique in the global hash table. | |
5030 | */ | |
5031 | if (!err_enomem) { | |
5032 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5033 | } | |
5034 | } | |
f45e313d DG |
5035 | |
5036 | /* | |
5037 | * Destroy a ust app data structure and free its memory. | |
5038 | */ | |
5039 | void ust_app_destroy(struct ust_app *app) | |
5040 | { | |
5041 | if (!app) { | |
5042 | return; | |
5043 | } | |
5044 | ||
5045 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5046 | } | |
6dc3064a DG |
5047 | |
5048 | /* | |
5049 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5050 | * output. | |
5051 | * | |
5052 | * Return 0 on success or else a negative value. | |
5053 | */ | |
5054 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
5c786ded | 5055 | struct snapshot_output *output, int wait, unsigned int nb_streams) |
6dc3064a DG |
5056 | { |
5057 | int ret = 0; | |
5058 | struct lttng_ht_iter iter; | |
5059 | struct ust_app *app; | |
af706bb7 | 5060 | char pathname[PATH_MAX]; |
5c786ded | 5061 | uint64_t max_stream_size = 0; |
6dc3064a DG |
5062 | |
5063 | assert(usess); | |
5064 | assert(output); | |
5065 | ||
5066 | rcu_read_lock(); | |
5067 | ||
5c786ded JD |
5068 | /* |
5069 | * Compute the maximum size of a single stream if a max size is asked by | |
5070 | * the caller. | |
5071 | */ | |
5072 | if (output->max_size > 0 && nb_streams > 0) { | |
5073 | max_stream_size = output->max_size / nb_streams; | |
5074 | } | |
5075 | ||
8c924c7b MD |
5076 | switch (usess->buffer_type) { |
5077 | case LTTNG_BUFFER_PER_UID: | |
5078 | { | |
5079 | struct buffer_reg_uid *reg; | |
6dc3064a | 5080 | |
8c924c7b MD |
5081 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5082 | struct buffer_reg_channel *reg_chan; | |
5083 | struct consumer_socket *socket; | |
6dc3064a | 5084 | |
8c924c7b MD |
5085 | /* Get consumer socket to use to push the metadata.*/ |
5086 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5087 | usess->consumer); | |
5088 | if (!socket) { | |
5089 | ret = -EINVAL; | |
5090 | goto error; | |
5091 | } | |
6dc3064a | 5092 | |
8c924c7b MD |
5093 | memset(pathname, 0, sizeof(pathname)); |
5094 | ret = snprintf(pathname, sizeof(pathname), | |
5095 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5096 | reg->uid, reg->bits_per_long); | |
5097 | if (ret < 0) { | |
5098 | PERROR("snprintf snapshot path"); | |
5099 | goto error; | |
5100 | } | |
5101 | ||
5102 | /* Add the UST default trace dir to path. */ | |
5103 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5104 | reg_chan, node.node) { | |
5105 | ||
5106 | /* | |
5107 | * Make sure the maximum stream size is not lower than the | |
5108 | * subbuffer size or else it's an error since we won't be able to | |
5109 | * snapshot anything. | |
5110 | */ | |
5111 | if (max_stream_size && | |
5112 | reg_chan->subbuf_size > max_stream_size) { | |
5113 | ret = -EINVAL; | |
5114 | DBG3("UST app snapshot record maximum stream size %" PRIu64 | |
6a00837f | 5115 | " is smaller than subbuffer size of %zu", |
8c924c7b MD |
5116 | max_stream_size, reg_chan->subbuf_size); |
5117 | goto error; | |
5118 | } | |
5119 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, output, 0, | |
5120 | usess->uid, usess->gid, pathname, wait, | |
5121 | max_stream_size); | |
5122 | if (ret < 0) { | |
5123 | goto error; | |
5124 | } | |
5125 | } | |
5126 | ret = consumer_snapshot_channel(socket, reg->registry->reg.ust->metadata_key, output, | |
5127 | 1, usess->uid, usess->gid, pathname, wait, | |
5128 | max_stream_size); | |
5129 | if (ret < 0) { | |
5130 | goto error; | |
5131 | } | |
af706bb7 | 5132 | } |
8c924c7b MD |
5133 | break; |
5134 | } | |
5135 | case LTTNG_BUFFER_PER_PID: | |
5136 | { | |
5137 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5138 | struct consumer_socket *socket; | |
5139 | struct lttng_ht_iter chan_iter; | |
5140 | struct ust_app_channel *ua_chan; | |
5141 | struct ust_app_session *ua_sess; | |
5142 | struct ust_registry_session *registry; | |
5143 | ||
5144 | ua_sess = lookup_session_by_app(usess, app); | |
5145 | if (!ua_sess) { | |
5146 | /* Session not associated with this app. */ | |
5147 | continue; | |
5148 | } | |
af706bb7 | 5149 | |
8c924c7b MD |
5150 | /* Get the right consumer socket for the application. */ |
5151 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5152 | output->consumer); | |
5153 | if (!socket) { | |
5c786ded | 5154 | ret = -EINVAL; |
5c786ded JD |
5155 | goto error; |
5156 | } | |
5157 | ||
8c924c7b MD |
5158 | /* Add the UST default trace dir to path. */ |
5159 | memset(pathname, 0, sizeof(pathname)); | |
5160 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5161 | ua_sess->path); | |
6dc3064a | 5162 | if (ret < 0) { |
8c924c7b | 5163 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5164 | goto error; |
5165 | } | |
6dc3064a | 5166 | |
8c924c7b MD |
5167 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5168 | ua_chan, node.node) { | |
5169 | /* | |
5170 | * Make sure the maximum stream size is not lower than the | |
5171 | * subbuffer size or else it's an error since we won't be able to | |
5172 | * snapshot anything. | |
5173 | */ | |
5174 | if (max_stream_size && | |
5175 | ua_chan->attr.subbuf_size > max_stream_size) { | |
5176 | ret = -EINVAL; | |
5177 | DBG3("UST app snapshot record maximum stream size %" PRIu64 | |
5178 | " is smaller than subbuffer size of %" PRIu64, | |
5179 | max_stream_size, ua_chan->attr.subbuf_size); | |
5180 | goto error; | |
5181 | } | |
6dc3064a | 5182 | |
8c924c7b MD |
5183 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, 0, |
5184 | ua_sess->euid, ua_sess->egid, pathname, wait, | |
5185 | max_stream_size); | |
5186 | if (ret < 0) { | |
5187 | goto error; | |
5188 | } | |
5189 | } | |
5190 | ||
5191 | registry = get_session_registry(ua_sess); | |
5192 | assert(registry); | |
5193 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
5194 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, | |
5195 | max_stream_size); | |
5196 | if (ret < 0) { | |
5197 | goto error; | |
5198 | } | |
5199 | } | |
5200 | break; | |
5201 | } | |
5202 | default: | |
5203 | assert(0); | |
5204 | break; | |
6dc3064a DG |
5205 | } |
5206 | ||
5207 | error: | |
5208 | rcu_read_unlock(); | |
5209 | return ret; | |
5210 | } | |
5c786ded JD |
5211 | |
5212 | /* | |
5213 | * Return the number of streams for a UST session. | |
5214 | */ | |
5215 | unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess) | |
5216 | { | |
5217 | unsigned int ret = 0; | |
5218 | struct ust_app *app; | |
5219 | struct lttng_ht_iter iter; | |
5220 | ||
5221 | assert(usess); | |
5222 | ||
5223 | switch (usess->buffer_type) { | |
5224 | case LTTNG_BUFFER_PER_UID: | |
5225 | { | |
5226 | struct buffer_reg_uid *reg; | |
5227 | ||
5228 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5229 | struct buffer_reg_channel *reg_chan; | |
5230 | ||
5231 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5232 | reg_chan, node.node) { | |
5233 | ret += reg_chan->stream_count; | |
5234 | } | |
5235 | } | |
5236 | break; | |
5237 | } | |
5238 | case LTTNG_BUFFER_PER_PID: | |
5239 | { | |
5240 | rcu_read_lock(); | |
5241 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5242 | struct ust_app_channel *ua_chan; | |
5243 | struct ust_app_session *ua_sess; | |
5244 | struct lttng_ht_iter chan_iter; | |
5245 | ||
5246 | ua_sess = lookup_session_by_app(usess, app); | |
5247 | if (!ua_sess) { | |
5248 | /* Session not associated with this app. */ | |
5249 | continue; | |
5250 | } | |
5251 | ||
5252 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5253 | ua_chan, node.node) { | |
5254 | ret += ua_chan->streams.count; | |
5255 | } | |
5256 | } | |
5257 | rcu_read_unlock(); | |
5258 | break; | |
5259 | } | |
5260 | default: | |
5261 | assert(0); | |
5262 | break; | |
5263 | } | |
5264 | ||
5265 | return ret; | |
5266 | } |