Commit | Line | Data |
---|---|---|
91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
91d76f53 DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
16 | */ |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <errno.h> | |
7972aab2 | 20 | #include <inttypes.h> |
91d76f53 DG |
21 | #include <pthread.h> |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
099e26bd | 24 | #include <string.h> |
aba8e916 DG |
25 | #include <sys/stat.h> |
26 | #include <sys/types.h> | |
099e26bd | 27 | #include <unistd.h> |
0df502fd | 28 | #include <urcu/compiler.h> |
fb54cdbf | 29 | #include <lttng/ust-error.h> |
331744e3 | 30 | #include <signal.h> |
bec39940 | 31 | |
990570ed | 32 | #include <common/common.h> |
86acf0da | 33 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 34 | |
7972aab2 | 35 | #include "buffer-registry.h" |
86acf0da DG |
36 | #include "fd-limit.h" |
37 | #include "health.h" | |
56fff090 | 38 | #include "ust-app.h" |
48842b30 | 39 | #include "ust-consumer.h" |
d80a6244 | 40 | #include "ust-ctl.h" |
0b2dc8df | 41 | #include "utils.h" |
d80a6244 | 42 | |
77c5447b 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 | /* | |
77c5447b | 52 | * Return the incremented value of next_channel_key. |
ffe60014 | 53 | */ |
77c5447b | 54 | static uint64_t get_next_channel_key(void) |
ffe60014 | 55 | { |
77c5447b 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 | */ |
77c5447b | 67 | static uint64_t get_next_session_id(void) |
ffe60014 | 68 | { |
77c5447b MD |
69 | uint64_t ret; |
70 | ||
71 | pthread_mutex_lock(&next_session_id_lock); | |
72 | ret = ++_next_session_id; | |
73 | pthread_mutex_unlock(&next_session_id_lock); | |
74 | return ret; | |
ffe60014 DG |
75 | } |
76 | ||
d65d2de8 DG |
77 | static void copy_channel_attr_to_ustctl( |
78 | struct ustctl_consumer_channel_attr *attr, | |
79 | struct lttng_ust_channel_attr *uattr) | |
80 | { | |
81 | /* Copy event attributes since the layout is different. */ | |
82 | attr->subbuf_size = uattr->subbuf_size; | |
83 | attr->num_subbuf = uattr->num_subbuf; | |
84 | attr->overwrite = uattr->overwrite; | |
85 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
86 | attr->read_timer_interval = uattr->read_timer_interval; | |
87 | attr->output = uattr->output; | |
88 | } | |
89 | ||
025faf73 DG |
90 | /* |
91 | * Match function for the hash table lookup. | |
92 | * | |
93 | * It matches an ust app event based on three attributes which are the event | |
94 | * name, the filter bytecode and the loglevel. | |
95 | */ | |
18eace3b DG |
96 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
97 | { | |
98 | struct ust_app_event *event; | |
99 | const struct ust_app_ht_key *key; | |
100 | ||
101 | assert(node); | |
102 | assert(_key); | |
103 | ||
104 | event = caa_container_of(node, struct ust_app_event, node.node); | |
105 | key = _key; | |
106 | ||
107 | /* Match the 3 elements of the key: name, filter and loglevel. */ | |
108 | ||
109 | /* Event name */ | |
110 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
111 | goto no_match; | |
112 | } | |
113 | ||
114 | /* Event loglevel. */ | |
115 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
116 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
117 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
118 | /* | |
119 | * Match is accepted. This is because on event creation, the | |
120 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
121 | * -1 are accepted for this loglevel type since 0 is the one set by | |
122 | * the API when receiving an enable event. | |
123 | */ | |
124 | } else { | |
125 | goto no_match; | |
126 | } | |
18eace3b DG |
127 | } |
128 | ||
129 | /* One of the filters is NULL, fail. */ | |
130 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
131 | goto no_match; | |
132 | } | |
133 | ||
025faf73 DG |
134 | if (key->filter && event->filter) { |
135 | /* Both filters exists, check length followed by the bytecode. */ | |
136 | if (event->filter->len != key->filter->len || | |
137 | memcmp(event->filter->data, key->filter->data, | |
138 | event->filter->len) != 0) { | |
139 | goto no_match; | |
140 | } | |
18eace3b DG |
141 | } |
142 | ||
025faf73 | 143 | /* Match. */ |
18eace3b DG |
144 | return 1; |
145 | ||
146 | no_match: | |
147 | return 0; | |
18eace3b DG |
148 | } |
149 | ||
025faf73 DG |
150 | /* |
151 | * Unique add of an ust app event in the given ht. This uses the custom | |
152 | * ht_match_ust_app_event match function and the event name as hash. | |
153 | */ | |
d0b96690 | 154 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
155 | struct ust_app_event *event) |
156 | { | |
157 | struct cds_lfht_node *node_ptr; | |
158 | struct ust_app_ht_key key; | |
d0b96690 | 159 | struct lttng_ht *ht; |
18eace3b | 160 | |
d0b96690 DG |
161 | assert(ua_chan); |
162 | assert(ua_chan->events); | |
18eace3b DG |
163 | assert(event); |
164 | ||
d0b96690 | 165 | ht = ua_chan->events; |
18eace3b DG |
166 | key.name = event->attr.name; |
167 | key.filter = event->filter; | |
168 | key.loglevel = event->attr.loglevel; | |
169 | ||
170 | node_ptr = cds_lfht_add_unique(ht->ht, | |
171 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
172 | ht_match_ust_app_event, &key, &event->node.node); | |
173 | assert(node_ptr == &event->node.node); | |
174 | } | |
175 | ||
d88aee68 DG |
176 | /* |
177 | * Close the notify socket from the given RCU head object. This MUST be called | |
178 | * through a call_rcu(). | |
179 | */ | |
180 | static void close_notify_sock_rcu(struct rcu_head *head) | |
181 | { | |
182 | int ret; | |
183 | struct ust_app_notify_sock_obj *obj = | |
184 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
185 | ||
186 | /* Must have a valid fd here. */ | |
187 | assert(obj->fd >= 0); | |
188 | ||
189 | ret = close(obj->fd); | |
190 | if (ret) { | |
191 | ERR("close notify sock %d RCU", obj->fd); | |
192 | } | |
193 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
194 | ||
195 | free(obj); | |
196 | } | |
197 | ||
7972aab2 DG |
198 | /* |
199 | * Return the session registry according to the buffer type of the given | |
200 | * session. | |
201 | * | |
202 | * A registry per UID object MUST exists before calling this function or else | |
203 | * it assert() if not found. RCU read side lock must be acquired. | |
204 | */ | |
205 | static struct ust_registry_session *get_session_registry( | |
206 | struct ust_app_session *ua_sess) | |
207 | { | |
208 | struct ust_registry_session *registry = NULL; | |
209 | ||
210 | assert(ua_sess); | |
211 | ||
212 | switch (ua_sess->buffer_type) { | |
213 | case LTTNG_BUFFER_PER_PID: | |
214 | { | |
215 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
216 | if (!reg_pid) { | |
217 | goto error; | |
218 | } | |
219 | registry = reg_pid->registry->reg.ust; | |
220 | break; | |
221 | } | |
222 | case LTTNG_BUFFER_PER_UID: | |
223 | { | |
224 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
225 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
226 | if (!reg_uid) { | |
227 | goto error; | |
228 | } | |
229 | registry = reg_uid->registry->reg.ust; | |
230 | break; | |
231 | } | |
232 | default: | |
233 | assert(0); | |
234 | }; | |
235 | ||
236 | error: | |
237 | return registry; | |
238 | } | |
239 | ||
55cc08a6 DG |
240 | /* |
241 | * Delete ust context safely. RCU read lock must be held before calling | |
242 | * this function. | |
243 | */ | |
244 | static | |
245 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
246 | { | |
ffe60014 DG |
247 | int ret; |
248 | ||
249 | assert(ua_ctx); | |
250 | ||
55cc08a6 | 251 | if (ua_ctx->obj) { |
ffe60014 | 252 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
253 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
254 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
255 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 256 | } |
55cc08a6 DG |
257 | free(ua_ctx->obj); |
258 | } | |
259 | free(ua_ctx); | |
260 | } | |
261 | ||
d80a6244 DG |
262 | /* |
263 | * Delete ust app event safely. RCU read lock must be held before calling | |
264 | * this function. | |
265 | */ | |
8b366481 DG |
266 | static |
267 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 268 | { |
ffe60014 DG |
269 | int ret; |
270 | ||
271 | assert(ua_event); | |
272 | ||
53a80697 | 273 | free(ua_event->filter); |
d80a6244 | 274 | |
edb67388 | 275 | if (ua_event->obj != NULL) { |
ffe60014 DG |
276 | ret = ustctl_release_object(sock, ua_event->obj); |
277 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
278 | ERR("UST app sock %d release event obj failed with ret %d", | |
279 | sock, ret); | |
280 | } | |
edb67388 DG |
281 | free(ua_event->obj); |
282 | } | |
d80a6244 DG |
283 | free(ua_event); |
284 | } | |
285 | ||
286 | /* | |
7972aab2 DG |
287 | * Release ust data object of the given stream. |
288 | * | |
289 | * Return 0 on success or else a negative value. | |
d80a6244 | 290 | */ |
7972aab2 | 291 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 292 | { |
7972aab2 | 293 | int ret = 0; |
ffe60014 DG |
294 | |
295 | assert(stream); | |
296 | ||
8b366481 | 297 | if (stream->obj) { |
ffe60014 DG |
298 | ret = ustctl_release_object(sock, stream->obj); |
299 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
300 | ERR("UST app sock %d release stream obj failed with ret %d", | |
301 | sock, ret); | |
302 | } | |
4063050c | 303 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
304 | free(stream->obj); |
305 | } | |
7972aab2 DG |
306 | |
307 | return ret; | |
308 | } | |
309 | ||
310 | /* | |
311 | * Delete ust app stream safely. RCU read lock must be held before calling | |
312 | * this function. | |
313 | */ | |
314 | static | |
315 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
316 | { | |
317 | assert(stream); | |
318 | ||
319 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 320 | free(stream); |
d80a6244 DG |
321 | } |
322 | ||
36b588ed MD |
323 | /* |
324 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
325 | * section and outside of call_rcu thread, so we postpone its execution |
326 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
327 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
328 | */ |
329 | static | |
330 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
331 | { | |
332 | struct ust_app_channel *ua_chan = | |
333 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
334 | ||
0b2dc8df MD |
335 | ht_cleanup_push(ua_chan->ctx); |
336 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
337 | free(ua_chan); |
338 | } | |
339 | ||
d80a6244 DG |
340 | /* |
341 | * Delete ust app channel safely. RCU read lock must be held before calling | |
342 | * this function. | |
343 | */ | |
8b366481 | 344 | static |
d0b96690 DG |
345 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
346 | struct ust_app *app) | |
d80a6244 DG |
347 | { |
348 | int ret; | |
bec39940 | 349 | struct lttng_ht_iter iter; |
d80a6244 | 350 | struct ust_app_event *ua_event; |
55cc08a6 | 351 | struct ust_app_ctx *ua_ctx; |
030a66fa | 352 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 353 | struct ust_registry_session *registry; |
d80a6244 | 354 | |
ffe60014 DG |
355 | assert(ua_chan); |
356 | ||
357 | DBG3("UST app deleting channel %s", ua_chan->name); | |
358 | ||
55cc08a6 | 359 | /* Wipe stream */ |
d80a6244 | 360 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 361 | cds_list_del(&stream->list); |
d80a6244 DG |
362 | delete_ust_app_stream(sock, stream); |
363 | } | |
364 | ||
55cc08a6 | 365 | /* Wipe context */ |
bec39940 | 366 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
4623416f | 367 | cds_list_del(&ua_ctx->list); |
bec39940 | 368 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 DG |
369 | assert(!ret); |
370 | delete_ust_app_ctx(sock, ua_ctx); | |
371 | } | |
d80a6244 | 372 | |
55cc08a6 | 373 | /* Wipe events */ |
bec39940 DG |
374 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
375 | node.node) { | |
376 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 377 | assert(!ret); |
d80a6244 DG |
378 | delete_ust_app_event(sock, ua_event); |
379 | } | |
edb67388 | 380 | |
5894f2c8 MD |
381 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
382 | /* Wipe and free registry from session registry. */ | |
383 | registry = get_session_registry(ua_chan->session); | |
384 | if (registry) { | |
385 | ust_registry_channel_del_free(registry, ua_chan->key); | |
386 | } | |
7972aab2 | 387 | } |
d0b96690 | 388 | |
edb67388 | 389 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
390 | /* Remove channel from application UST object descriptor. */ |
391 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
392 | lttng_ht_del(app->ust_objd, &iter); | |
ffe60014 DG |
393 | ret = ustctl_release_object(sock, ua_chan->obj); |
394 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
395 | ERR("UST app sock %d release channel obj failed with ret %d", | |
396 | sock, ret); | |
397 | } | |
7972aab2 | 398 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
399 | free(ua_chan->obj); |
400 | } | |
36b588ed | 401 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
402 | } |
403 | ||
331744e3 | 404 | /* |
1b532a60 DG |
405 | * Push metadata to consumer socket. |
406 | * | |
407 | * The socket lock MUST be acquired. | |
408 | * The ust app session lock MUST be acquired. | |
331744e3 JD |
409 | * |
410 | * On success, return the len of metadata pushed or else a negative value. | |
411 | */ | |
412 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
413 | struct consumer_socket *socket, int send_zero_data) | |
414 | { | |
415 | int ret; | |
416 | char *metadata_str = NULL; | |
417 | size_t len, offset; | |
418 | ssize_t ret_val; | |
419 | ||
420 | assert(registry); | |
421 | assert(socket); | |
1b532a60 DG |
422 | |
423 | /* | |
424 | * On a push metadata error either the consumer is dead or the metadata | |
425 | * channel has been destroyed because its endpoint might have died (e.g: | |
426 | * relayd). If so, the metadata closed flag is set to 1 so we deny pushing | |
427 | * metadata again which is not valid anymore on the consumer side. | |
428 | * | |
429 | * The ust app session mutex locked allows us to make this check without | |
430 | * the registry lock. | |
431 | */ | |
432 | if (registry->metadata_closed) { | |
433 | return -EPIPE; | |
434 | } | |
331744e3 JD |
435 | |
436 | pthread_mutex_lock(®istry->lock); | |
437 | ||
438 | offset = registry->metadata_len_sent; | |
439 | len = registry->metadata_len - registry->metadata_len_sent; | |
440 | if (len == 0) { | |
441 | DBG3("No metadata to push for metadata key %" PRIu64, | |
442 | registry->metadata_key); | |
443 | ret_val = len; | |
444 | if (send_zero_data) { | |
445 | DBG("No metadata to push"); | |
446 | goto push_data; | |
447 | } | |
448 | goto end; | |
449 | } | |
450 | ||
451 | /* Allocate only what we have to send. */ | |
452 | metadata_str = zmalloc(len); | |
453 | if (!metadata_str) { | |
454 | PERROR("zmalloc ust app metadata string"); | |
455 | ret_val = -ENOMEM; | |
456 | goto error; | |
457 | } | |
458 | /* Copy what we haven't send out. */ | |
459 | memcpy(metadata_str, registry->metadata + offset, len); | |
460 | registry->metadata_len_sent += len; | |
461 | ||
462 | push_data: | |
463 | pthread_mutex_unlock(®istry->lock); | |
464 | ret = consumer_push_metadata(socket, registry->metadata_key, | |
465 | metadata_str, len, offset); | |
466 | if (ret < 0) { | |
890d27f4 DG |
467 | /* |
468 | * There is an acceptable race here between the registry metadata key | |
469 | * assignment and the creation on the consumer. The session daemon can | |
470 | * concurrently push metadata for this registry while being created on | |
471 | * the consumer since the metadata key of the registry is assigned | |
472 | * *before* it is setup to avoid the consumer to ask for metadata that | |
473 | * could possibly be not found in the session daemon. | |
474 | * | |
475 | * The metadata will get pushed either by the session being stopped or | |
476 | * the consumer requesting metadata if that race is triggered. | |
477 | */ | |
478 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
479 | ret = 0; | |
480 | } | |
f36ec06c DG |
481 | |
482 | /* Update back the actual metadata len sent since it failed here. */ | |
483 | pthread_mutex_lock(®istry->lock); | |
484 | registry->metadata_len_sent -= len; | |
485 | pthread_mutex_unlock(®istry->lock); | |
331744e3 JD |
486 | ret_val = ret; |
487 | goto error_push; | |
488 | } | |
489 | ||
490 | free(metadata_str); | |
491 | return len; | |
492 | ||
493 | end: | |
494 | error: | |
495 | pthread_mutex_unlock(®istry->lock); | |
496 | error_push: | |
497 | free(metadata_str); | |
498 | return ret_val; | |
499 | } | |
500 | ||
d88aee68 DG |
501 | /* |
502 | * For a given application and session, push metadata to consumer. The session | |
503 | * lock MUST be acquired here before calling this. | |
331744e3 JD |
504 | * Either sock or consumer is required : if sock is NULL, the default |
505 | * socket to send the metadata is retrieved from consumer, if sock | |
506 | * is not NULL we use it to send the metadata. | |
d88aee68 DG |
507 | * |
508 | * Return 0 on success else a negative error. | |
509 | */ | |
7972aab2 DG |
510 | static int push_metadata(struct ust_registry_session *registry, |
511 | struct consumer_output *consumer) | |
d88aee68 | 512 | { |
331744e3 JD |
513 | int ret_val; |
514 | ssize_t ret; | |
d88aee68 DG |
515 | struct consumer_socket *socket; |
516 | ||
7972aab2 DG |
517 | assert(registry); |
518 | assert(consumer); | |
519 | ||
520 | rcu_read_lock(); | |
d88aee68 | 521 | |
7972aab2 DG |
522 | /* |
523 | * Means that no metadata was assigned to the session. This can happens if | |
524 | * no start has been done previously. | |
525 | */ | |
526 | if (!registry->metadata_key) { | |
331744e3 | 527 | ret_val = 0; |
1b532a60 | 528 | goto end_rcu_unlock; |
d88aee68 DG |
529 | } |
530 | ||
d88aee68 | 531 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
532 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
533 | consumer); | |
d88aee68 | 534 | if (!socket) { |
331744e3 | 535 | ret_val = -1; |
d88aee68 DG |
536 | goto error_rcu_unlock; |
537 | } | |
538 | ||
539 | /* | |
540 | * TODO: Currently, we hold the socket lock around sampling of the next | |
541 | * metadata segment to ensure we send metadata over the consumer socket in | |
542 | * the correct order. This makes the registry lock nest inside the socket | |
543 | * lock. | |
544 | * | |
545 | * Please note that this is a temporary measure: we should move this lock | |
546 | * back into ust_consumer_push_metadata() when the consumer gets the | |
547 | * ability to reorder the metadata it receives. | |
548 | */ | |
549 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
550 | ret = ust_app_push_metadata(registry, socket, 0); |
551 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 552 | if (ret < 0) { |
331744e3 | 553 | ret_val = ret; |
d88aee68 DG |
554 | goto error_rcu_unlock; |
555 | } | |
556 | ||
d88aee68 | 557 | rcu_read_unlock(); |
d88aee68 DG |
558 | return 0; |
559 | ||
d88aee68 | 560 | error_rcu_unlock: |
1b532a60 DG |
561 | /* |
562 | * On error, flag the registry that the metadata is closed. We were unable | |
563 | * to push anything and this means that either the consumer is not | |
564 | * responding or the metadata cache has been destroyed on the consumer. | |
565 | */ | |
566 | registry->metadata_closed = 1; | |
567 | end_rcu_unlock: | |
d88aee68 | 568 | rcu_read_unlock(); |
331744e3 | 569 | return ret_val; |
d88aee68 DG |
570 | } |
571 | ||
572 | /* | |
573 | * Send to the consumer a close metadata command for the given session. Once | |
574 | * done, the metadata channel is deleted and the session metadata pointer is | |
575 | * nullified. The session lock MUST be acquired here unless the application is | |
576 | * in the destroy path. | |
577 | * | |
578 | * Return 0 on success else a negative value. | |
579 | */ | |
7972aab2 DG |
580 | static int close_metadata(struct ust_registry_session *registry, |
581 | struct consumer_output *consumer) | |
d88aee68 DG |
582 | { |
583 | int ret; | |
584 | struct consumer_socket *socket; | |
585 | ||
7972aab2 DG |
586 | assert(registry); |
587 | assert(consumer); | |
d88aee68 | 588 | |
7972aab2 DG |
589 | rcu_read_lock(); |
590 | ||
591 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 | 592 | ret = 0; |
1b532a60 | 593 | goto end; |
d88aee68 DG |
594 | } |
595 | ||
d88aee68 | 596 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
597 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
598 | consumer); | |
d88aee68 DG |
599 | if (!socket) { |
600 | ret = -1; | |
7972aab2 | 601 | goto error; |
d88aee68 DG |
602 | } |
603 | ||
7972aab2 | 604 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 605 | if (ret < 0) { |
7972aab2 | 606 | goto error; |
d88aee68 DG |
607 | } |
608 | ||
d88aee68 | 609 | error: |
1b532a60 DG |
610 | /* |
611 | * Metadata closed. Even on error this means that the consumer is not | |
612 | * responding or not found so either way a second close should NOT be emit | |
613 | * for this registry. | |
614 | */ | |
615 | registry->metadata_closed = 1; | |
616 | end: | |
7972aab2 | 617 | rcu_read_unlock(); |
d88aee68 DG |
618 | return ret; |
619 | } | |
620 | ||
36b588ed MD |
621 | /* |
622 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
623 | * section and outside of call_rcu thread, so we postpone its execution |
624 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
625 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
626 | */ |
627 | static | |
628 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
629 | { | |
630 | struct ust_app_session *ua_sess = | |
631 | caa_container_of(head, struct ust_app_session, rcu_head); | |
632 | ||
0b2dc8df | 633 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
634 | free(ua_sess); |
635 | } | |
636 | ||
d80a6244 DG |
637 | /* |
638 | * Delete ust app session safely. RCU read lock must be held before calling | |
639 | * this function. | |
640 | */ | |
8b366481 | 641 | static |
d0b96690 DG |
642 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
643 | struct ust_app *app) | |
d80a6244 DG |
644 | { |
645 | int ret; | |
bec39940 | 646 | struct lttng_ht_iter iter; |
d80a6244 | 647 | struct ust_app_channel *ua_chan; |
7972aab2 | 648 | struct ust_registry_session *registry; |
d80a6244 | 649 | |
d88aee68 DG |
650 | assert(ua_sess); |
651 | ||
1b532a60 DG |
652 | pthread_mutex_lock(&ua_sess->lock); |
653 | ||
7972aab2 | 654 | registry = get_session_registry(ua_sess); |
1b532a60 | 655 | if (registry && !registry->metadata_closed) { |
d88aee68 | 656 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 657 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 658 | |
7972aab2 DG |
659 | /* |
660 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
661 | * metadata only on destroy trace session in this case. Also, the |
662 | * previous push metadata could have flag the metadata registry to | |
663 | * close so don't send a close command if closed. | |
7972aab2 | 664 | */ |
1b532a60 DG |
665 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
666 | !registry->metadata_closed) { | |
7972aab2 DG |
667 | /* And ask to close it for this session registry. */ |
668 | (void) close_metadata(registry, ua_sess->consumer); | |
669 | } | |
d80a6244 DG |
670 | } |
671 | ||
bec39940 DG |
672 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
673 | node.node) { | |
674 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 675 | assert(!ret); |
d0b96690 | 676 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 677 | } |
d80a6244 | 678 | |
7972aab2 DG |
679 | /* In case of per PID, the registry is kept in the session. */ |
680 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
681 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
682 | if (reg_pid) { | |
683 | buffer_reg_pid_remove(reg_pid); | |
684 | buffer_reg_pid_destroy(reg_pid); | |
685 | } | |
686 | } | |
d0b96690 | 687 | |
aee6bafd | 688 | if (ua_sess->handle != -1) { |
ffe60014 DG |
689 | ret = ustctl_release_handle(sock, ua_sess->handle); |
690 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
691 | ERR("UST app sock %d release session handle failed with ret %d", | |
692 | sock, ret); | |
693 | } | |
aee6bafd | 694 | } |
1b532a60 DG |
695 | pthread_mutex_unlock(&ua_sess->lock); |
696 | ||
36b588ed | 697 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 698 | } |
91d76f53 DG |
699 | |
700 | /* | |
284d8f55 DG |
701 | * Delete a traceable application structure from the global list. Never call |
702 | * this function outside of a call_rcu call. | |
36b588ed MD |
703 | * |
704 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 705 | */ |
8b366481 DG |
706 | static |
707 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 708 | { |
8b366481 | 709 | int ret, sock; |
d42f20df | 710 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 711 | |
d80a6244 | 712 | /* Delete ust app sessions info */ |
852d0037 DG |
713 | sock = app->sock; |
714 | app->sock = -1; | |
d80a6244 | 715 | |
8b366481 | 716 | /* Wipe sessions */ |
d42f20df DG |
717 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
718 | teardown_node) { | |
719 | /* Free every object in the session and the session. */ | |
36b588ed | 720 | rcu_read_lock(); |
d0b96690 | 721 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 722 | rcu_read_unlock(); |
d80a6244 | 723 | } |
36b588ed | 724 | |
0b2dc8df MD |
725 | ht_cleanup_push(app->sessions); |
726 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 727 | |
6414a713 | 728 | /* |
852d0037 DG |
729 | * Wait until we have deleted the application from the sock hash table |
730 | * before closing this socket, otherwise an application could re-use the | |
731 | * socket ID and race with the teardown, using the same hash table entry. | |
732 | * | |
733 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
734 | * all RCU readers that could run concurrently with unregister app, | |
735 | * therefore we _need_ to only close that socket after a grace period. So | |
736 | * it should stay in this RCU callback. | |
737 | * | |
738 | * This close() is a very important step of the synchronization model so | |
739 | * every modification to this function must be carefully reviewed. | |
6414a713 | 740 | */ |
799e2c4f MD |
741 | ret = close(sock); |
742 | if (ret) { | |
743 | PERROR("close"); | |
744 | } | |
4063050c | 745 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 746 | |
852d0037 | 747 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 748 | free(app); |
099e26bd DG |
749 | } |
750 | ||
751 | /* | |
f6a9efaa | 752 | * URCU intermediate call to delete an UST app. |
099e26bd | 753 | */ |
8b366481 DG |
754 | static |
755 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 756 | { |
bec39940 DG |
757 | struct lttng_ht_node_ulong *node = |
758 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 759 | struct ust_app *app = |
852d0037 | 760 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 761 | |
852d0037 | 762 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 763 | delete_ust_app(app); |
099e26bd DG |
764 | } |
765 | ||
ffe60014 DG |
766 | /* |
767 | * Delete the session from the application ht and delete the data structure by | |
768 | * freeing every object inside and releasing them. | |
769 | */ | |
d0b96690 | 770 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
771 | struct ust_app_session *ua_sess) |
772 | { | |
773 | int ret; | |
774 | struct lttng_ht_iter iter; | |
775 | ||
776 | assert(app); | |
777 | assert(ua_sess); | |
778 | ||
779 | iter.iter.node = &ua_sess->node.node; | |
780 | ret = lttng_ht_del(app->sessions, &iter); | |
781 | if (ret) { | |
782 | /* Already scheduled for teardown. */ | |
783 | goto end; | |
784 | } | |
785 | ||
786 | /* Once deleted, free the data structure. */ | |
d0b96690 | 787 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
788 | |
789 | end: | |
790 | return; | |
791 | } | |
792 | ||
8b366481 DG |
793 | /* |
794 | * Alloc new UST app session. | |
795 | */ | |
796 | static | |
d0b96690 | 797 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
798 | { |
799 | struct ust_app_session *ua_sess; | |
800 | ||
801 | /* Init most of the default value by allocating and zeroing */ | |
802 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
803 | if (ua_sess == NULL) { | |
804 | PERROR("malloc"); | |
ffe60014 | 805 | goto error_free; |
8b366481 DG |
806 | } |
807 | ||
808 | ua_sess->handle = -1; | |
bec39940 | 809 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
d0b96690 | 810 | pthread_mutex_init(&ua_sess->lock, NULL); |
ffe60014 | 811 | |
8b366481 DG |
812 | return ua_sess; |
813 | ||
ffe60014 | 814 | error_free: |
8b366481 DG |
815 | return NULL; |
816 | } | |
817 | ||
818 | /* | |
819 | * Alloc new UST app channel. | |
820 | */ | |
821 | static | |
822 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 823 | struct ust_app_session *ua_sess, |
ffe60014 | 824 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
825 | { |
826 | struct ust_app_channel *ua_chan; | |
827 | ||
828 | /* Init most of the default value by allocating and zeroing */ | |
829 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
830 | if (ua_chan == NULL) { | |
831 | PERROR("malloc"); | |
832 | goto error; | |
833 | } | |
834 | ||
835 | /* Setup channel name */ | |
836 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
837 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
838 | ||
839 | ua_chan->enabled = 1; | |
840 | ua_chan->handle = -1; | |
45893984 | 841 | ua_chan->session = ua_sess; |
ffe60014 | 842 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
843 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
844 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
845 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
846 | |
847 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
4623416f | 848 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
849 | |
850 | /* Copy attributes */ | |
851 | if (attr) { | |
ffe60014 | 852 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
853 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
854 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
855 | ua_chan->attr.overwrite = attr->overwrite; | |
856 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
857 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
858 | ua_chan->attr.output = attr->output; | |
8b366481 | 859 | } |
ffe60014 DG |
860 | /* By default, the channel is a per cpu channel. */ |
861 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
862 | |
863 | DBG3("UST app channel %s allocated", ua_chan->name); | |
864 | ||
865 | return ua_chan; | |
866 | ||
867 | error: | |
868 | return NULL; | |
869 | } | |
870 | ||
37f1c236 DG |
871 | /* |
872 | * Allocate and initialize a UST app stream. | |
873 | * | |
874 | * Return newly allocated stream pointer or NULL on error. | |
875 | */ | |
ffe60014 | 876 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
877 | { |
878 | struct ust_app_stream *stream = NULL; | |
879 | ||
880 | stream = zmalloc(sizeof(*stream)); | |
881 | if (stream == NULL) { | |
882 | PERROR("zmalloc ust app stream"); | |
883 | goto error; | |
884 | } | |
885 | ||
886 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
887 | stream->handle = -1; | |
888 | ||
889 | error: | |
890 | return stream; | |
891 | } | |
892 | ||
8b366481 DG |
893 | /* |
894 | * Alloc new UST app event. | |
895 | */ | |
896 | static | |
897 | struct ust_app_event *alloc_ust_app_event(char *name, | |
898 | struct lttng_ust_event *attr) | |
899 | { | |
900 | struct ust_app_event *ua_event; | |
901 | ||
902 | /* Init most of the default value by allocating and zeroing */ | |
903 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
904 | if (ua_event == NULL) { | |
905 | PERROR("malloc"); | |
906 | goto error; | |
907 | } | |
908 | ||
909 | ua_event->enabled = 1; | |
910 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
911 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 912 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
913 | |
914 | /* Copy attributes */ | |
915 | if (attr) { | |
916 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
917 | } | |
918 | ||
919 | DBG3("UST app event %s allocated", ua_event->name); | |
920 | ||
921 | return ua_event; | |
922 | ||
923 | error: | |
924 | return NULL; | |
925 | } | |
926 | ||
927 | /* | |
928 | * Alloc new UST app context. | |
929 | */ | |
930 | static | |
931 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
932 | { | |
933 | struct ust_app_ctx *ua_ctx; | |
934 | ||
935 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
936 | if (ua_ctx == NULL) { | |
937 | goto error; | |
938 | } | |
939 | ||
4623416f DG |
940 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
941 | ||
8b366481 DG |
942 | if (uctx) { |
943 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
944 | } | |
945 | ||
946 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
947 | ||
948 | error: | |
949 | return ua_ctx; | |
950 | } | |
951 | ||
025faf73 DG |
952 | /* |
953 | * Allocate a filter and copy the given original filter. | |
954 | * | |
955 | * Return allocated filter or NULL on error. | |
956 | */ | |
957 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
958 | struct lttng_ust_filter_bytecode *orig_f) | |
959 | { | |
960 | struct lttng_ust_filter_bytecode *filter = NULL; | |
961 | ||
962 | /* Copy filter bytecode */ | |
963 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
964 | if (!filter) { | |
965 | PERROR("zmalloc alloc ust app filter"); | |
966 | goto error; | |
967 | } | |
968 | ||
969 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
970 | ||
971 | error: | |
972 | return filter; | |
973 | } | |
974 | ||
099e26bd | 975 | /* |
421cb601 DG |
976 | * Find an ust_app using the sock and return it. RCU read side lock must be |
977 | * held before calling this helper function. | |
099e26bd | 978 | */ |
8b366481 DG |
979 | static |
980 | struct ust_app *find_app_by_sock(int sock) | |
099e26bd | 981 | { |
bec39940 | 982 | struct lttng_ht_node_ulong *node; |
bec39940 | 983 | struct lttng_ht_iter iter; |
f6a9efaa | 984 | |
852d0037 | 985 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 986 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
987 | if (node == NULL) { |
988 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
989 | goto error; |
990 | } | |
852d0037 DG |
991 | |
992 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
993 | |
994 | error: | |
995 | return NULL; | |
099e26bd DG |
996 | } |
997 | ||
d0b96690 DG |
998 | /* |
999 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1000 | * be held before calling this helper function. | |
1001 | */ | |
1002 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1003 | { | |
1004 | struct lttng_ht_node_ulong *node; | |
1005 | struct lttng_ht_iter iter; | |
1006 | ||
1007 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1008 | &iter); | |
1009 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1010 | if (node == NULL) { | |
1011 | DBG2("UST app find by notify sock %d not found", sock); | |
1012 | goto error; | |
1013 | } | |
1014 | ||
1015 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1016 | ||
1017 | error: | |
1018 | return NULL; | |
1019 | } | |
1020 | ||
025faf73 DG |
1021 | /* |
1022 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1023 | * event loglevel. | |
1024 | * | |
1025 | * Return an ust_app_event object or NULL on error. | |
1026 | */ | |
18eace3b DG |
1027 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
1028 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel) | |
1029 | { | |
1030 | struct lttng_ht_iter iter; | |
1031 | struct lttng_ht_node_str *node; | |
1032 | struct ust_app_event *event = NULL; | |
1033 | struct ust_app_ht_key key; | |
18eace3b DG |
1034 | |
1035 | assert(name); | |
1036 | assert(ht); | |
1037 | ||
1038 | /* Setup key for event lookup. */ | |
1039 | key.name = name; | |
1040 | key.filter = filter; | |
1041 | key.loglevel = loglevel; | |
1042 | ||
025faf73 DG |
1043 | /* Lookup using the event name as hash and a custom match fct. */ |
1044 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1045 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1046 | node = lttng_ht_iter_get_node_str(&iter); |
1047 | if (node == NULL) { | |
1048 | goto end; | |
1049 | } | |
1050 | ||
1051 | event = caa_container_of(node, struct ust_app_event, node); | |
1052 | ||
1053 | end: | |
18eace3b DG |
1054 | return event; |
1055 | } | |
1056 | ||
55cc08a6 DG |
1057 | /* |
1058 | * Create the channel context on the tracer. | |
d0b96690 DG |
1059 | * |
1060 | * Called with UST app session lock held. | |
55cc08a6 DG |
1061 | */ |
1062 | static | |
1063 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1064 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1065 | { | |
1066 | int ret; | |
1067 | ||
840cb59c | 1068 | health_code_update(); |
86acf0da | 1069 | |
852d0037 | 1070 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1071 | ua_chan->obj, &ua_ctx->obj); |
1072 | if (ret < 0) { | |
ffe60014 DG |
1073 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1074 | ERR("UST app create channel context failed for app (pid: %d) " | |
1075 | "with ret %d", app->pid, ret); | |
1076 | } else { | |
47cb9d4a 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 { | |
47cb9d4a DG |
1121 | /* |
1122 | * This is normal behavior, an application can die during the | |
1123 | * creation process. Don't report an error so the execution can | |
1124 | * continue normally. | |
1125 | */ | |
1126 | ret = 0; | |
ffe60014 DG |
1127 | DBG3("UST app filter event failed. Application is dead."); |
1128 | } | |
53a80697 MD |
1129 | goto error; |
1130 | } | |
1131 | ||
1132 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1133 | ||
1134 | error: | |
840cb59c | 1135 | health_code_update(); |
53a80697 MD |
1136 | return ret; |
1137 | } | |
1138 | ||
9730260e DG |
1139 | /* |
1140 | * Disable the specified event on to UST tracer for the UST session. | |
1141 | */ | |
1142 | static int disable_ust_event(struct ust_app *app, | |
1143 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1144 | { | |
1145 | int ret; | |
1146 | ||
840cb59c | 1147 | health_code_update(); |
86acf0da | 1148 | |
852d0037 | 1149 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1150 | if (ret < 0) { |
ffe60014 DG |
1151 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1152 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1153 | "and session handle %d with ret %d", | |
1154 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1155 | } else { | |
47cb9d4a DG |
1156 | /* |
1157 | * This is normal behavior, an application can die during the | |
1158 | * creation process. Don't report an error so the execution can | |
1159 | * continue normally. | |
1160 | */ | |
1161 | ret = 0; | |
ffe60014 DG |
1162 | DBG3("UST app disable event failed. Application is dead."); |
1163 | } | |
9730260e DG |
1164 | goto error; |
1165 | } | |
1166 | ||
1167 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1168 | ua_event->attr.name, app->pid); |
9730260e DG |
1169 | |
1170 | error: | |
840cb59c | 1171 | health_code_update(); |
9730260e DG |
1172 | return ret; |
1173 | } | |
1174 | ||
78f0bacd DG |
1175 | /* |
1176 | * Disable the specified channel on to UST tracer for the UST session. | |
1177 | */ | |
1178 | static int disable_ust_channel(struct ust_app *app, | |
1179 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1180 | { | |
1181 | int ret; | |
1182 | ||
840cb59c | 1183 | health_code_update(); |
86acf0da | 1184 | |
852d0037 | 1185 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1186 | if (ret < 0) { |
ffe60014 DG |
1187 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1188 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1189 | "and session handle %d with ret %d", | |
1190 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1191 | } else { | |
47cb9d4a DG |
1192 | /* |
1193 | * This is normal behavior, an application can die during the | |
1194 | * creation process. Don't report an error so the execution can | |
1195 | * continue normally. | |
1196 | */ | |
1197 | ret = 0; | |
ffe60014 DG |
1198 | DBG3("UST app disable channel failed. Application is dead."); |
1199 | } | |
78f0bacd DG |
1200 | goto error; |
1201 | } | |
1202 | ||
78f0bacd | 1203 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1204 | ua_chan->name, app->pid); |
78f0bacd DG |
1205 | |
1206 | error: | |
840cb59c | 1207 | health_code_update(); |
78f0bacd DG |
1208 | return ret; |
1209 | } | |
1210 | ||
1211 | /* | |
1212 | * Enable the specified channel on to UST tracer for the UST session. | |
1213 | */ | |
1214 | static int enable_ust_channel(struct ust_app *app, | |
1215 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1216 | { | |
1217 | int ret; | |
1218 | ||
840cb59c | 1219 | health_code_update(); |
86acf0da | 1220 | |
852d0037 | 1221 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1222 | if (ret < 0) { |
ffe60014 DG |
1223 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1224 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1225 | "and session handle %d with ret %d", | |
1226 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1227 | } else { | |
47cb9d4a DG |
1228 | /* |
1229 | * This is normal behavior, an application can die during the | |
1230 | * creation process. Don't report an error so the execution can | |
1231 | * continue normally. | |
1232 | */ | |
1233 | ret = 0; | |
ffe60014 DG |
1234 | DBG3("UST app enable channel failed. Application is dead."); |
1235 | } | |
78f0bacd DG |
1236 | goto error; |
1237 | } | |
1238 | ||
1239 | ua_chan->enabled = 1; | |
1240 | ||
1241 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1242 | ua_chan->name, app->pid); |
78f0bacd DG |
1243 | |
1244 | error: | |
840cb59c | 1245 | health_code_update(); |
78f0bacd DG |
1246 | return ret; |
1247 | } | |
1248 | ||
edb67388 DG |
1249 | /* |
1250 | * Enable the specified event on to UST tracer for the UST session. | |
1251 | */ | |
1252 | static int enable_ust_event(struct ust_app *app, | |
1253 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1254 | { | |
1255 | int ret; | |
1256 | ||
840cb59c | 1257 | health_code_update(); |
86acf0da | 1258 | |
852d0037 | 1259 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1260 | if (ret < 0) { |
ffe60014 DG |
1261 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1262 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1263 | "and session handle %d with ret %d", | |
1264 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1265 | } else { | |
47cb9d4a DG |
1266 | /* |
1267 | * This is normal behavior, an application can die during the | |
1268 | * creation process. Don't report an error so the execution can | |
1269 | * continue normally. | |
1270 | */ | |
1271 | ret = 0; | |
ffe60014 DG |
1272 | DBG3("UST app enable event failed. Application is dead."); |
1273 | } | |
edb67388 DG |
1274 | goto error; |
1275 | } | |
1276 | ||
1277 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1278 | ua_event->attr.name, app->pid); |
edb67388 DG |
1279 | |
1280 | error: | |
840cb59c | 1281 | health_code_update(); |
edb67388 DG |
1282 | return ret; |
1283 | } | |
1284 | ||
099e26bd | 1285 | /* |
7972aab2 | 1286 | * Send channel and stream buffer to application. |
4f3ab6ee | 1287 | * |
ffe60014 | 1288 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1289 | */ |
7972aab2 DG |
1290 | static int send_channel_pid_to_ust(struct ust_app *app, |
1291 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1292 | { |
1293 | int ret; | |
ffe60014 | 1294 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1295 | |
1296 | assert(app); | |
ffe60014 | 1297 | assert(ua_sess); |
4f3ab6ee | 1298 | assert(ua_chan); |
4f3ab6ee | 1299 | |
840cb59c | 1300 | health_code_update(); |
4f3ab6ee | 1301 | |
7972aab2 DG |
1302 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1303 | app->sock); | |
86acf0da | 1304 | |
ffe60014 DG |
1305 | /* Send channel to the application. */ |
1306 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1307 | if (ret < 0) { |
b551a063 DG |
1308 | goto error; |
1309 | } | |
1310 | ||
d88aee68 DG |
1311 | health_code_update(); |
1312 | ||
ffe60014 DG |
1313 | /* Send all streams to application. */ |
1314 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1315 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1316 | if (ret < 0) { | |
1317 | goto error; | |
1318 | } | |
1319 | /* We don't need the stream anymore once sent to the tracer. */ | |
1320 | cds_list_del(&stream->list); | |
1321 | delete_ust_app_stream(-1, stream); | |
1322 | } | |
ffe60014 DG |
1323 | /* Flag the channel that it is sent to the application. */ |
1324 | ua_chan->is_sent = 1; | |
ffe60014 | 1325 | |
b551a063 | 1326 | error: |
840cb59c | 1327 | health_code_update(); |
b551a063 DG |
1328 | return ret; |
1329 | } | |
1330 | ||
91d76f53 | 1331 | /* |
5b4a0ec0 | 1332 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1333 | * |
1334 | * Should be called with session mutex held. | |
91d76f53 | 1335 | */ |
edb67388 DG |
1336 | static |
1337 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1338 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1339 | { |
5b4a0ec0 | 1340 | int ret = 0; |
284d8f55 | 1341 | |
840cb59c | 1342 | health_code_update(); |
86acf0da | 1343 | |
5b4a0ec0 | 1344 | /* Create UST event on tracer */ |
852d0037 | 1345 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1346 | &ua_event->obj); |
1347 | if (ret < 0) { | |
ffe60014 DG |
1348 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1349 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1350 | ua_event->attr.name, app->pid, ret); | |
1351 | } else { | |
47cb9d4a DG |
1352 | /* |
1353 | * This is normal behavior, an application can die during the | |
1354 | * creation process. Don't report an error so the execution can | |
1355 | * continue normally. | |
1356 | */ | |
1357 | ret = 0; | |
ffe60014 DG |
1358 | DBG3("UST app create event failed. Application is dead."); |
1359 | } | |
5b4a0ec0 | 1360 | goto error; |
91d76f53 | 1361 | } |
f6a9efaa | 1362 | |
5b4a0ec0 | 1363 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1364 | |
5b4a0ec0 | 1365 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1366 | ua_event->attr.name, app->pid); |
f6a9efaa | 1367 | |
840cb59c | 1368 | health_code_update(); |
86acf0da | 1369 | |
025faf73 DG |
1370 | /* Set filter if one is present. */ |
1371 | if (ua_event->filter) { | |
1372 | ret = set_ust_event_filter(ua_event, app); | |
1373 | if (ret < 0) { | |
1374 | goto error; | |
1375 | } | |
1376 | } | |
1377 | ||
8535a6d9 | 1378 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 1379 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
1380 | ret = disable_ust_event(app, ua_sess, ua_event); |
1381 | if (ret < 0) { | |
fc34caaa DG |
1382 | /* |
1383 | * If we hit an EPERM, something is wrong with our disable call. If | |
1384 | * we get an EEXIST, there is a problem on the tracer side since we | |
1385 | * just created it. | |
1386 | */ | |
1387 | switch (ret) { | |
49c336c1 | 1388 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1389 | /* Code flow problem */ |
1390 | assert(0); | |
49c336c1 | 1391 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1392 | /* It's OK for our use case. */ |
1393 | ret = 0; | |
1394 | break; | |
1395 | default: | |
1396 | break; | |
1397 | } | |
8535a6d9 DG |
1398 | goto error; |
1399 | } | |
1400 | } | |
1401 | ||
5b4a0ec0 | 1402 | error: |
840cb59c | 1403 | health_code_update(); |
5b4a0ec0 | 1404 | return ret; |
91d76f53 | 1405 | } |
48842b30 | 1406 | |
5b4a0ec0 DG |
1407 | /* |
1408 | * Copy data between an UST app event and a LTT event. | |
1409 | */ | |
421cb601 | 1410 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1411 | struct ltt_ust_event *uevent) |
1412 | { | |
1413 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); | |
1414 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1415 | ||
fc34caaa DG |
1416 | ua_event->enabled = uevent->enabled; |
1417 | ||
5b4a0ec0 DG |
1418 | /* Copy event attributes */ |
1419 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1420 | ||
53a80697 MD |
1421 | /* Copy filter bytecode */ |
1422 | if (uevent->filter) { | |
025faf73 DG |
1423 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1424 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1425 | } |
48842b30 DG |
1426 | } |
1427 | ||
5b4a0ec0 DG |
1428 | /* |
1429 | * Copy data between an UST app channel and a LTT channel. | |
1430 | */ | |
421cb601 | 1431 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1432 | struct ltt_ust_channel *uchan) |
1433 | { | |
bec39940 | 1434 | struct lttng_ht_iter iter; |
48842b30 | 1435 | struct ltt_ust_event *uevent; |
55cc08a6 | 1436 | struct ltt_ust_context *uctx; |
48842b30 | 1437 | struct ust_app_event *ua_event; |
55cc08a6 | 1438 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1439 | |
fc34caaa | 1440 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1441 | |
1442 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1443 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1444 | |
1624d5b7 JD |
1445 | ua_chan->tracefile_size = uchan->tracefile_size; |
1446 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1447 | ||
ffe60014 DG |
1448 | /* Copy event attributes since the layout is different. */ |
1449 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1450 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1451 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1452 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1453 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1454 | ua_chan->attr.output = uchan->attr.output; | |
1455 | /* | |
1456 | * Note that the attribute channel type is not set since the channel on the | |
1457 | * tracing registry side does not have this information. | |
1458 | */ | |
48842b30 | 1459 | |
fc34caaa | 1460 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1461 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1462 | |
4623416f | 1463 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1464 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1465 | if (ua_ctx == NULL) { | |
1466 | continue; | |
1467 | } | |
bec39940 DG |
1468 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1469 | (unsigned long) ua_ctx->ctx.ctx); | |
1470 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
4623416f | 1471 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1472 | } |
48842b30 | 1473 | |
421cb601 | 1474 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1475 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b DG |
1476 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
1477 | uevent->filter, uevent->attr.loglevel); | |
1478 | if (ua_event == NULL) { | |
421cb601 | 1479 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1480 | uevent->attr.name); |
284d8f55 | 1481 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1482 | if (ua_event == NULL) { |
5b4a0ec0 | 1483 | continue; |
48842b30 | 1484 | } |
421cb601 | 1485 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1486 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1487 | } |
48842b30 DG |
1488 | } |
1489 | ||
fc34caaa | 1490 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1491 | } |
1492 | ||
5b4a0ec0 DG |
1493 | /* |
1494 | * Copy data between a UST app session and a regular LTT session. | |
1495 | */ | |
421cb601 | 1496 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1497 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1498 | { |
bec39940 DG |
1499 | struct lttng_ht_node_str *ua_chan_node; |
1500 | struct lttng_ht_iter iter; | |
48842b30 DG |
1501 | struct ltt_ust_channel *uchan; |
1502 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1503 | time_t rawtime; |
1504 | struct tm *timeinfo; | |
1505 | char datetime[16]; | |
1506 | int ret; | |
1507 | ||
1508 | /* Get date and time for unique app path */ | |
1509 | time(&rawtime); | |
1510 | timeinfo = localtime(&rawtime); | |
1511 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1512 | |
421cb601 | 1513 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1514 | |
7972aab2 DG |
1515 | ua_sess->tracing_id = usess->id; |
1516 | ua_sess->id = get_next_session_id(); | |
1517 | ua_sess->uid = app->uid; | |
1518 | ua_sess->gid = app->gid; | |
1519 | ua_sess->euid = usess->uid; | |
1520 | ua_sess->egid = usess->gid; | |
1521 | ua_sess->buffer_type = usess->buffer_type; | |
1522 | ua_sess->bits_per_long = app->bits_per_long; | |
1523 | /* There is only one consumer object per session possible. */ | |
1524 | ua_sess->consumer = usess->consumer; | |
1525 | ||
1526 | switch (ua_sess->buffer_type) { | |
1527 | case LTTNG_BUFFER_PER_PID: | |
1528 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1529 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1530 | datetime); |
1531 | break; | |
1532 | case LTTNG_BUFFER_PER_UID: | |
1533 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1534 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1535 | break; | |
1536 | default: | |
1537 | assert(0); | |
1538 | goto error; | |
1539 | } | |
477d7741 MD |
1540 | if (ret < 0) { |
1541 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1542 | assert(0); |
7972aab2 | 1543 | goto error; |
477d7741 MD |
1544 | } |
1545 | ||
48842b30 | 1546 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1547 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1548 | uchan, node.node) { | |
1549 | struct lttng_ht_iter uiter; | |
ba767faf | 1550 | |
bec39940 DG |
1551 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1552 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1553 | if (ua_chan_node != NULL) { |
fc34caaa | 1554 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1555 | continue; |
1556 | } | |
421cb601 | 1557 | |
5b4a0ec0 DG |
1558 | DBG2("Channel %s not found on shadow session copy, creating it", |
1559 | uchan->name); | |
d0b96690 | 1560 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1561 | if (ua_chan == NULL) { |
fc34caaa | 1562 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1563 | continue; |
48842b30 | 1564 | } |
5b4a0ec0 | 1565 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1566 | /* |
1567 | * The concept of metadata channel does not exist on the tracing | |
1568 | * registry side of the session daemon so this can only be a per CPU | |
1569 | * channel and not metadata. | |
1570 | */ | |
1571 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1572 | ||
bec39940 | 1573 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1574 | } |
7972aab2 DG |
1575 | |
1576 | error: | |
1577 | return; | |
48842b30 DG |
1578 | } |
1579 | ||
78f0bacd DG |
1580 | /* |
1581 | * Lookup sesison wrapper. | |
1582 | */ | |
84cd17c6 MD |
1583 | static |
1584 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1585 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1586 | { |
1587 | /* Get right UST app session from app */ | |
77c5447b | 1588 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1589 | } |
1590 | ||
421cb601 DG |
1591 | /* |
1592 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1593 | * id. |
421cb601 | 1594 | */ |
48842b30 DG |
1595 | static struct ust_app_session *lookup_session_by_app( |
1596 | struct ltt_ust_session *usess, struct ust_app *app) | |
1597 | { | |
bec39940 | 1598 | struct lttng_ht_iter iter; |
77c5447b | 1599 | struct lttng_ht_node_u64 *node; |
48842b30 | 1600 | |
84cd17c6 | 1601 | __lookup_session_by_app(usess, app, &iter); |
77c5447b | 1602 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1603 | if (node == NULL) { |
1604 | goto error; | |
1605 | } | |
1606 | ||
1607 | return caa_container_of(node, struct ust_app_session, node); | |
1608 | ||
1609 | error: | |
1610 | return NULL; | |
1611 | } | |
1612 | ||
7972aab2 DG |
1613 | /* |
1614 | * Setup buffer registry per PID for the given session and application. If none | |
1615 | * is found, a new one is created, added to the global registry and | |
1616 | * initialized. If regp is valid, it's set with the newly created object. | |
1617 | * | |
1618 | * Return 0 on success or else a negative value. | |
1619 | */ | |
1620 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1621 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1622 | { | |
1623 | int ret = 0; | |
1624 | struct buffer_reg_pid *reg_pid; | |
1625 | ||
1626 | assert(ua_sess); | |
1627 | assert(app); | |
1628 | ||
1629 | rcu_read_lock(); | |
1630 | ||
1631 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1632 | if (!reg_pid) { | |
1633 | /* | |
1634 | * This is the create channel path meaning that if there is NO | |
1635 | * registry available, we have to create one for this session. | |
1636 | */ | |
1637 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1638 | if (ret < 0) { | |
1639 | goto error; | |
1640 | } | |
1641 | buffer_reg_pid_add(reg_pid); | |
1642 | } else { | |
1643 | goto end; | |
1644 | } | |
1645 | ||
1646 | /* Initialize registry. */ | |
1647 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1648 | app->bits_per_long, app->uint8_t_alignment, | |
1649 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1650 | app->uint64_t_alignment, app->long_alignment, |
1651 | app->byte_order, app->version.major, | |
1652 | app->version.minor); | |
7972aab2 DG |
1653 | if (ret < 0) { |
1654 | goto error; | |
1655 | } | |
1656 | ||
1657 | DBG3("UST app buffer registry per PID created successfully"); | |
1658 | ||
1659 | end: | |
1660 | if (regp) { | |
1661 | *regp = reg_pid; | |
1662 | } | |
1663 | error: | |
1664 | rcu_read_unlock(); | |
1665 | return ret; | |
1666 | } | |
1667 | ||
1668 | /* | |
1669 | * Setup buffer registry per UID for the given session and application. If none | |
1670 | * is found, a new one is created, added to the global registry and | |
1671 | * initialized. If regp is valid, it's set with the newly created object. | |
1672 | * | |
1673 | * Return 0 on success or else a negative value. | |
1674 | */ | |
1675 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1676 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1677 | { | |
1678 | int ret = 0; | |
1679 | struct buffer_reg_uid *reg_uid; | |
1680 | ||
1681 | assert(usess); | |
1682 | assert(app); | |
1683 | ||
1684 | rcu_read_lock(); | |
1685 | ||
1686 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1687 | if (!reg_uid) { | |
1688 | /* | |
1689 | * This is the create channel path meaning that if there is NO | |
1690 | * registry available, we have to create one for this session. | |
1691 | */ | |
1692 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1693 | LTTNG_DOMAIN_UST, ®_uid); | |
1694 | if (ret < 0) { | |
1695 | goto error; | |
1696 | } | |
1697 | buffer_reg_uid_add(reg_uid); | |
1698 | } else { | |
1699 | goto end; | |
1700 | } | |
1701 | ||
1702 | /* Initialize registry. */ | |
af6142cf | 1703 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1704 | app->bits_per_long, app->uint8_t_alignment, |
1705 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1706 | app->uint64_t_alignment, app->long_alignment, |
1707 | app->byte_order, app->version.major, | |
1708 | app->version.minor); | |
7972aab2 DG |
1709 | if (ret < 0) { |
1710 | goto error; | |
1711 | } | |
1712 | /* Add node to teardown list of the session. */ | |
1713 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1714 | ||
1715 | DBG3("UST app buffer registry per UID created successfully"); | |
1716 | ||
1717 | end: | |
1718 | if (regp) { | |
1719 | *regp = reg_uid; | |
1720 | } | |
1721 | error: | |
1722 | rcu_read_unlock(); | |
1723 | return ret; | |
1724 | } | |
1725 | ||
421cb601 | 1726 | /* |
3d8ca23b | 1727 | * Create a session on the tracer side for the given app. |
421cb601 | 1728 | * |
3d8ca23b DG |
1729 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1730 | * untouched. If the session was created, is_created is set to 1. On error, | |
1731 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1732 | * be NULL. | |
1733 | * | |
1734 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1735 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1736 | */ |
3d8ca23b DG |
1737 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1738 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1739 | int *is_created) | |
421cb601 | 1740 | { |
3d8ca23b | 1741 | int ret, created = 0; |
421cb601 DG |
1742 | struct ust_app_session *ua_sess; |
1743 | ||
3d8ca23b DG |
1744 | assert(usess); |
1745 | assert(app); | |
1746 | assert(ua_sess_ptr); | |
1747 | ||
840cb59c | 1748 | health_code_update(); |
86acf0da | 1749 | |
421cb601 DG |
1750 | ua_sess = lookup_session_by_app(usess, app); |
1751 | if (ua_sess == NULL) { | |
77c5447b | 1752 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1753 | app->pid, usess->id); |
d0b96690 | 1754 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1755 | if (ua_sess == NULL) { |
1756 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1757 | ret = -ENOMEM; |
1758 | goto error; | |
421cb601 | 1759 | } |
477d7741 | 1760 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1761 | created = 1; |
421cb601 DG |
1762 | } |
1763 | ||
7972aab2 DG |
1764 | switch (usess->buffer_type) { |
1765 | case LTTNG_BUFFER_PER_PID: | |
1766 | /* Init local registry. */ | |
1767 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1768 | if (ret < 0) { |
7972aab2 DG |
1769 | goto error; |
1770 | } | |
1771 | break; | |
1772 | case LTTNG_BUFFER_PER_UID: | |
1773 | /* Look for a global registry. If none exists, create one. */ | |
1774 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1775 | if (ret < 0) { | |
1776 | goto error; | |
1777 | } | |
1778 | break; | |
1779 | default: | |
1780 | assert(0); | |
1781 | ret = -EINVAL; | |
1782 | goto error; | |
1783 | } | |
1784 | ||
1785 | health_code_update(); | |
1786 | ||
1787 | if (ua_sess->handle == -1) { | |
1788 | ret = ustctl_create_session(app->sock); | |
1789 | if (ret < 0) { | |
1790 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1791 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1792 | app->pid, ret); |
1793 | } else { | |
1794 | DBG("UST app creating session failed. Application is dead"); | |
47cb9d4a DG |
1795 | /* |
1796 | * This is normal behavior, an application can die during the | |
1797 | * creation process. Don't report an error so the execution can | |
1798 | * continue normally. This will get flagged ENOTCONN and the | |
1799 | * caller will handle it. | |
1800 | */ | |
1801 | ret = 0; | |
ffe60014 | 1802 | } |
d0b96690 | 1803 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1804 | if (ret != -ENOMEM) { |
1805 | /* | |
1806 | * Tracer is probably gone or got an internal error so let's | |
1807 | * behave like it will soon unregister or not usable. | |
1808 | */ | |
1809 | ret = -ENOTCONN; | |
1810 | } | |
1811 | goto error; | |
421cb601 DG |
1812 | } |
1813 | ||
7972aab2 DG |
1814 | ua_sess->handle = ret; |
1815 | ||
1816 | /* Add ust app session to app's HT */ | |
77c5447b MD |
1817 | lttng_ht_node_init_u64(&ua_sess->node, |
1818 | ua_sess->tracing_id); | |
1819 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1820 | |
1821 | DBG2("UST app session created successfully with handle %d", ret); | |
1822 | } | |
1823 | ||
1824 | *ua_sess_ptr = ua_sess; | |
1825 | if (is_created) { | |
1826 | *is_created = created; | |
1827 | } | |
1828 | ||
1829 | /* Everything went well. */ | |
1830 | ret = 0; | |
1831 | ||
1832 | error: | |
1833 | health_code_update(); | |
1834 | return ret; | |
1835 | } | |
1836 | ||
1837 | /* | |
1838 | * Create a context for the channel on the tracer. | |
1839 | * | |
1840 | * Called with UST app session lock held and a RCU read side lock. | |
1841 | */ | |
1842 | static | |
1843 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1844 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1845 | struct ust_app *app) | |
1846 | { | |
1847 | int ret = 0; | |
1848 | struct lttng_ht_iter iter; | |
1849 | struct lttng_ht_node_ulong *node; | |
1850 | struct ust_app_ctx *ua_ctx; | |
1851 | ||
1852 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1853 | ||
1854 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); | |
1855 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1856 | if (node != NULL) { | |
1857 | ret = -EEXIST; | |
1858 | goto error; | |
1859 | } | |
1860 | ||
1861 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1862 | if (ua_ctx == NULL) { | |
1863 | /* malloc failed */ | |
1864 | ret = -1; | |
1865 | goto error; | |
1866 | } | |
1867 | ||
1868 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
1869 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
4623416f | 1870 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
1871 | |
1872 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1873 | if (ret < 0) { | |
1874 | goto error; | |
1875 | } | |
1876 | ||
1877 | error: | |
1878 | return ret; | |
1879 | } | |
1880 | ||
1881 | /* | |
1882 | * Enable on the tracer side a ust app event for the session and channel. | |
1883 | * | |
1884 | * Called with UST app session lock held. | |
1885 | */ | |
1886 | static | |
1887 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
1888 | struct ust_app_event *ua_event, struct ust_app *app) | |
1889 | { | |
1890 | int ret; | |
1891 | ||
1892 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1893 | if (ret < 0) { | |
1894 | goto error; | |
1895 | } | |
1896 | ||
1897 | ua_event->enabled = 1; | |
1898 | ||
1899 | error: | |
1900 | return ret; | |
1901 | } | |
1902 | ||
1903 | /* | |
1904 | * Disable on the tracer side a ust app event for the session and channel. | |
1905 | */ | |
1906 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
1907 | struct ust_app_event *ua_event, struct ust_app *app) | |
1908 | { | |
1909 | int ret; | |
1910 | ||
1911 | ret = disable_ust_event(app, ua_sess, ua_event); | |
1912 | if (ret < 0) { | |
1913 | goto error; | |
1914 | } | |
1915 | ||
1916 | ua_event->enabled = 0; | |
1917 | ||
1918 | error: | |
1919 | return ret; | |
1920 | } | |
1921 | ||
1922 | /* | |
1923 | * Lookup ust app channel for session and disable it on the tracer side. | |
1924 | */ | |
1925 | static | |
1926 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
1927 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
1928 | { | |
1929 | int ret; | |
1930 | ||
1931 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
1932 | if (ret < 0) { | |
1933 | goto error; | |
1934 | } | |
1935 | ||
1936 | ua_chan->enabled = 0; | |
1937 | ||
1938 | error: | |
1939 | return ret; | |
1940 | } | |
1941 | ||
1942 | /* | |
1943 | * Lookup ust app channel for session and enable it on the tracer side. This | |
1944 | * MUST be called with a RCU read side lock acquired. | |
1945 | */ | |
1946 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
1947 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
1948 | { | |
1949 | int ret = 0; | |
1950 | struct lttng_ht_iter iter; | |
1951 | struct lttng_ht_node_str *ua_chan_node; | |
1952 | struct ust_app_channel *ua_chan; | |
1953 | ||
1954 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
1955 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
1956 | if (ua_chan_node == NULL) { | |
77c5447b | 1957 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
1958 | uchan->name, ua_sess->tracing_id); |
1959 | goto error; | |
1960 | } | |
1961 | ||
1962 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
1963 | ||
1964 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
1965 | if (ret < 0) { | |
1966 | goto error; | |
1967 | } | |
1968 | ||
1969 | error: | |
1970 | return ret; | |
1971 | } | |
1972 | ||
1973 | /* | |
1974 | * Ask the consumer to create a channel and get it if successful. | |
1975 | * | |
1976 | * Return 0 on success or else a negative value. | |
1977 | */ | |
1978 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
1979 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
1980 | int bitness, struct ust_registry_session *registry) | |
1981 | { | |
1982 | int ret; | |
1983 | unsigned int nb_fd = 0; | |
1984 | struct consumer_socket *socket; | |
1985 | ||
1986 | assert(usess); | |
1987 | assert(ua_sess); | |
1988 | assert(ua_chan); | |
1989 | assert(registry); | |
1990 | ||
1991 | rcu_read_lock(); | |
1992 | health_code_update(); | |
1993 | ||
1994 | /* Get the right consumer socket for the application. */ | |
1995 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
1996 | if (!socket) { | |
1997 | ret = -EINVAL; | |
1998 | goto error; | |
1999 | } | |
2000 | ||
2001 | health_code_update(); | |
2002 | ||
2003 | /* Need one fd for the channel. */ | |
2004 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2005 | if (ret < 0) { | |
2006 | ERR("Exhausted number of available FD upon create channel"); | |
2007 | goto error; | |
2008 | } | |
2009 | ||
2010 | /* | |
2011 | * Ask consumer to create channel. The consumer will return the number of | |
2012 | * stream we have to expect. | |
2013 | */ | |
2014 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2015 | registry); | |
2016 | if (ret < 0) { | |
2017 | goto error_ask; | |
2018 | } | |
2019 | ||
2020 | /* | |
2021 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2022 | * stream (2 being the default value here). | |
2023 | */ | |
2024 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2025 | ||
2026 | /* Reserve the amount of file descriptor we need. */ | |
2027 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2028 | if (ret < 0) { | |
2029 | ERR("Exhausted number of available FD upon create channel"); | |
2030 | goto error_fd_get_stream; | |
2031 | } | |
2032 | ||
2033 | health_code_update(); | |
2034 | ||
2035 | /* | |
2036 | * Now get the channel from the consumer. This call wil populate the stream | |
2037 | * list of that channel and set the ust objects. | |
2038 | */ | |
d9078d0c DG |
2039 | if (usess->consumer->enabled) { |
2040 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2041 | if (ret < 0) { | |
2042 | goto error_destroy; | |
2043 | } | |
7972aab2 DG |
2044 | } |
2045 | ||
2046 | rcu_read_unlock(); | |
2047 | return 0; | |
2048 | ||
2049 | error_destroy: | |
2050 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2051 | error_fd_get_stream: | |
2052 | /* | |
2053 | * Initiate a destroy channel on the consumer since we had an error | |
2054 | * handling it on our side. The return value is of no importance since we | |
2055 | * already have a ret value set by the previous error that we need to | |
2056 | * return. | |
2057 | */ | |
2058 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2059 | error_ask: | |
2060 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2061 | error: | |
2062 | health_code_update(); | |
2063 | rcu_read_unlock(); | |
2064 | return ret; | |
2065 | } | |
2066 | ||
2067 | /* | |
2068 | * Duplicate the ust data object of the ust app stream and save it in the | |
2069 | * buffer registry stream. | |
2070 | * | |
2071 | * Return 0 on success or else a negative value. | |
2072 | */ | |
2073 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2074 | struct ust_app_stream *stream) | |
2075 | { | |
2076 | int ret; | |
2077 | ||
2078 | assert(reg_stream); | |
2079 | assert(stream); | |
2080 | ||
2081 | /* Reserve the amount of file descriptor we need. */ | |
2082 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2083 | if (ret < 0) { | |
2084 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2085 | goto error; | |
2086 | } | |
2087 | ||
2088 | /* Duplicate object for stream once the original is in the registry. */ | |
2089 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2090 | reg_stream->obj.ust); | |
2091 | if (ret < 0) { | |
2092 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2093 | reg_stream->obj.ust, stream->obj, ret); | |
2094 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2095 | goto error; | |
2096 | } | |
2097 | stream->handle = stream->obj->handle; | |
2098 | ||
2099 | error: | |
2100 | return ret; | |
2101 | } | |
2102 | ||
2103 | /* | |
2104 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2105 | * buffer registry channel. | |
2106 | * | |
2107 | * Return 0 on success or else a negative value. | |
2108 | */ | |
2109 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2110 | struct ust_app_channel *ua_chan) | |
2111 | { | |
2112 | int ret; | |
2113 | ||
2114 | assert(reg_chan); | |
2115 | assert(ua_chan); | |
2116 | ||
2117 | /* Need two fds for the channel. */ | |
2118 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2119 | if (ret < 0) { | |
2120 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2121 | goto error_fd_get; | |
2122 | } | |
2123 | ||
2124 | /* Duplicate object for stream once the original is in the registry. */ | |
2125 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2126 | if (ret < 0) { | |
2127 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2128 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2129 | goto error; | |
2130 | } | |
2131 | ua_chan->handle = ua_chan->obj->handle; | |
2132 | ||
2133 | return 0; | |
2134 | ||
2135 | error: | |
2136 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2137 | error_fd_get: | |
2138 | return ret; | |
2139 | } | |
2140 | ||
2141 | /* | |
2142 | * For a given channel buffer registry, setup all streams of the given ust | |
2143 | * application channel. | |
2144 | * | |
2145 | * Return 0 on success or else a negative value. | |
2146 | */ | |
2147 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2148 | struct ust_app_channel *ua_chan) | |
2149 | { | |
2150 | int ret = 0; | |
2151 | struct ust_app_stream *stream, *stmp; | |
2152 | ||
2153 | assert(reg_chan); | |
2154 | assert(ua_chan); | |
2155 | ||
2156 | DBG2("UST app setup buffer registry stream"); | |
2157 | ||
2158 | /* Send all streams to application. */ | |
2159 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2160 | struct buffer_reg_stream *reg_stream; | |
2161 | ||
2162 | ret = buffer_reg_stream_create(®_stream); | |
2163 | if (ret < 0) { | |
2164 | goto error; | |
2165 | } | |
2166 | ||
2167 | /* | |
2168 | * Keep original pointer and nullify it in the stream so the delete | |
2169 | * stream call does not release the object. | |
2170 | */ | |
2171 | reg_stream->obj.ust = stream->obj; | |
2172 | stream->obj = NULL; | |
2173 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2174 | |
7972aab2 DG |
2175 | /* We don't need the streams anymore. */ |
2176 | cds_list_del(&stream->list); | |
2177 | delete_ust_app_stream(-1, stream); | |
2178 | } | |
421cb601 | 2179 | |
7972aab2 DG |
2180 | error: |
2181 | return ret; | |
2182 | } | |
2183 | ||
2184 | /* | |
2185 | * Create a buffer registry channel for the given session registry and | |
2186 | * application channel object. If regp pointer is valid, it's set with the | |
2187 | * created object. Important, the created object is NOT added to the session | |
2188 | * registry hash table. | |
2189 | * | |
2190 | * Return 0 on success else a negative value. | |
2191 | */ | |
2192 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2193 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2194 | { | |
2195 | int ret; | |
2196 | struct buffer_reg_channel *reg_chan = NULL; | |
2197 | ||
2198 | assert(reg_sess); | |
2199 | assert(ua_chan); | |
2200 | ||
2201 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2202 | ||
2203 | /* Create buffer registry channel. */ | |
2204 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2205 | if (ret < 0) { | |
2206 | goto error_create; | |
421cb601 | 2207 | } |
7972aab2 DG |
2208 | assert(reg_chan); |
2209 | reg_chan->consumer_key = ua_chan->key; | |
421cb601 | 2210 | |
7972aab2 DG |
2211 | /* Create and add a channel registry to session. */ |
2212 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2213 | ua_chan->tracing_channel_id); | |
2214 | if (ret < 0) { | |
2215 | goto error; | |
d88aee68 | 2216 | } |
7972aab2 | 2217 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2218 | |
7972aab2 DG |
2219 | if (regp) { |
2220 | *regp = reg_chan; | |
3d8ca23b | 2221 | } |
d88aee68 | 2222 | |
7972aab2 | 2223 | return 0; |
3d8ca23b DG |
2224 | |
2225 | error: | |
7972aab2 DG |
2226 | /* Safe because the registry channel object was not added to any HT. */ |
2227 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2228 | error_create: | |
3d8ca23b | 2229 | return ret; |
421cb601 DG |
2230 | } |
2231 | ||
55cc08a6 | 2232 | /* |
7972aab2 DG |
2233 | * Setup buffer registry channel for the given session registry and application |
2234 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2235 | * |
7972aab2 | 2236 | * Return 0 on success else a negative value. |
55cc08a6 | 2237 | */ |
7972aab2 DG |
2238 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2239 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2240 | { |
7972aab2 | 2241 | int ret; |
55cc08a6 | 2242 | |
7972aab2 DG |
2243 | assert(reg_sess); |
2244 | assert(reg_chan); | |
2245 | assert(ua_chan); | |
2246 | assert(ua_chan->obj); | |
55cc08a6 | 2247 | |
7972aab2 | 2248 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2249 | |
7972aab2 DG |
2250 | /* Setup all streams for the registry. */ |
2251 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2252 | if (ret < 0) { | |
55cc08a6 DG |
2253 | goto error; |
2254 | } | |
2255 | ||
7972aab2 DG |
2256 | reg_chan->obj.ust = ua_chan->obj; |
2257 | ua_chan->obj = NULL; | |
55cc08a6 | 2258 | |
7972aab2 | 2259 | return 0; |
55cc08a6 DG |
2260 | |
2261 | error: | |
7972aab2 DG |
2262 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2263 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2264 | return ret; |
2265 | } | |
2266 | ||
edb67388 | 2267 | /* |
7972aab2 | 2268 | * Send buffer registry channel to the application. |
d0b96690 | 2269 | * |
7972aab2 | 2270 | * Return 0 on success else a negative value. |
edb67388 | 2271 | */ |
7972aab2 DG |
2272 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2273 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2274 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2275 | { |
2276 | int ret; | |
7972aab2 | 2277 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2278 | |
7972aab2 DG |
2279 | assert(reg_chan); |
2280 | assert(app); | |
2281 | assert(ua_sess); | |
2282 | assert(ua_chan); | |
2283 | ||
2284 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2285 | ||
2286 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2287 | if (ret < 0) { |
2288 | goto error; | |
2289 | } | |
2290 | ||
7972aab2 DG |
2291 | /* Send channel to the application. */ |
2292 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2293 | if (ret < 0) { | |
2294 | goto error; | |
2295 | } | |
2296 | ||
2297 | health_code_update(); | |
2298 | ||
2299 | /* Send all streams to application. */ | |
2300 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2301 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2302 | struct ust_app_stream stream; | |
2303 | ||
2304 | ret = duplicate_stream_object(reg_stream, &stream); | |
2305 | if (ret < 0) { | |
2306 | goto error_stream_unlock; | |
2307 | } | |
2308 | ||
2309 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2310 | if (ret < 0) { | |
8c067051 | 2311 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2312 | goto error_stream_unlock; |
2313 | } | |
edb67388 | 2314 | |
7972aab2 DG |
2315 | /* |
2316 | * The return value is not important here. This function will output an | |
2317 | * error if needed. | |
2318 | */ | |
2319 | (void) release_ust_app_stream(-1, &stream); | |
2320 | } | |
2321 | ua_chan->is_sent = 1; | |
2322 | ||
2323 | error_stream_unlock: | |
2324 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2325 | error: |
2326 | return ret; | |
2327 | } | |
2328 | ||
9730260e | 2329 | /* |
7972aab2 DG |
2330 | * Create and send to the application the created buffers with per UID buffers. |
2331 | * | |
2332 | * Return 0 on success else a negative value. | |
9730260e | 2333 | */ |
7972aab2 DG |
2334 | static int create_channel_per_uid(struct ust_app *app, |
2335 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2336 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2337 | { |
2338 | int ret; | |
7972aab2 DG |
2339 | struct buffer_reg_uid *reg_uid; |
2340 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2341 | |
7972aab2 DG |
2342 | assert(app); |
2343 | assert(usess); | |
2344 | assert(ua_sess); | |
2345 | assert(ua_chan); | |
2346 | ||
2347 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2348 | ||
2349 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2350 | /* | |
2351 | * The session creation handles the creation of this global registry | |
2352 | * object. If none can be find, there is a code flow problem or a | |
2353 | * teardown race. | |
2354 | */ | |
2355 | assert(reg_uid); | |
2356 | ||
2357 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2358 | reg_uid); | |
2359 | if (!reg_chan) { | |
2360 | /* Create the buffer registry channel object. */ | |
2361 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2362 | if (ret < 0) { | |
2363 | goto error; | |
2364 | } | |
2365 | assert(reg_chan); | |
2366 | ||
2367 | /* | |
2368 | * Create the buffers on the consumer side. This call populates the | |
2369 | * ust app channel object with all streams and data object. | |
2370 | */ | |
2371 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2372 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2373 | if (ret < 0) { | |
07d2ae95 DG |
2374 | /* |
2375 | * Let's remove the previously created buffer registry channel so | |
2376 | * it's not visible anymore in the session registry. | |
2377 | */ | |
2378 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2379 | ua_chan->tracing_channel_id); | |
2380 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2381 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2382 | goto error; |
2383 | } | |
2384 | ||
2385 | /* | |
2386 | * Setup the streams and add it to the session registry. | |
2387 | */ | |
2388 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2389 | if (ret < 0) { | |
2390 | goto error; | |
2391 | } | |
2392 | ||
2393 | } | |
2394 | ||
2395 | /* Send buffers to the application. */ | |
2396 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2397 | if (ret < 0) { |
2398 | goto error; | |
2399 | } | |
2400 | ||
9730260e DG |
2401 | error: |
2402 | return ret; | |
2403 | } | |
2404 | ||
78f0bacd | 2405 | /* |
7972aab2 DG |
2406 | * Create and send to the application the created buffers with per PID buffers. |
2407 | * | |
2408 | * Return 0 on success else a negative value. | |
78f0bacd | 2409 | */ |
7972aab2 DG |
2410 | static int create_channel_per_pid(struct ust_app *app, |
2411 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2412 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2413 | { |
8535a6d9 | 2414 | int ret; |
7972aab2 | 2415 | struct ust_registry_session *registry; |
78f0bacd | 2416 | |
7972aab2 DG |
2417 | assert(app); |
2418 | assert(usess); | |
2419 | assert(ua_sess); | |
2420 | assert(ua_chan); | |
2421 | ||
2422 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2423 | ||
2424 | rcu_read_lock(); | |
2425 | ||
2426 | registry = get_session_registry(ua_sess); | |
2427 | assert(registry); | |
2428 | ||
2429 | /* Create and add a new channel registry to session. */ | |
2430 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2431 | if (ret < 0) { |
2432 | goto error; | |
2433 | } | |
2434 | ||
7972aab2 DG |
2435 | /* Create and get channel on the consumer side. */ |
2436 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2437 | app->bits_per_long, registry); | |
2438 | if (ret < 0) { | |
2439 | goto error; | |
2440 | } | |
2441 | ||
2442 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2443 | if (ret < 0) { | |
2444 | goto error; | |
2445 | } | |
8535a6d9 | 2446 | |
78f0bacd | 2447 | error: |
7972aab2 | 2448 | rcu_read_unlock(); |
78f0bacd DG |
2449 | return ret; |
2450 | } | |
2451 | ||
2452 | /* | |
7972aab2 DG |
2453 | * From an already allocated ust app channel, create the channel buffers if |
2454 | * need and send it to the application. This MUST be called with a RCU read | |
2455 | * side lock acquired. | |
2456 | * | |
2457 | * Return 0 on success or else a negative value. | |
78f0bacd | 2458 | */ |
7972aab2 DG |
2459 | static int do_create_channel(struct ust_app *app, |
2460 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2461 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2462 | { |
7972aab2 | 2463 | int ret; |
78f0bacd | 2464 | |
7972aab2 DG |
2465 | assert(app); |
2466 | assert(usess); | |
2467 | assert(ua_sess); | |
2468 | assert(ua_chan); | |
2469 | ||
2470 | /* Handle buffer type before sending the channel to the application. */ | |
2471 | switch (usess->buffer_type) { | |
2472 | case LTTNG_BUFFER_PER_UID: | |
2473 | { | |
2474 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2475 | if (ret < 0) { | |
2476 | goto error; | |
2477 | } | |
2478 | break; | |
2479 | } | |
2480 | case LTTNG_BUFFER_PER_PID: | |
2481 | { | |
2482 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2483 | if (ret < 0) { | |
2484 | goto error; | |
2485 | } | |
2486 | break; | |
2487 | } | |
2488 | default: | |
2489 | assert(0); | |
2490 | ret = -EINVAL; | |
78f0bacd DG |
2491 | goto error; |
2492 | } | |
2493 | ||
7972aab2 DG |
2494 | /* Initialize ust objd object using the received handle and add it. */ |
2495 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2496 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2497 | |
7972aab2 DG |
2498 | /* If channel is not enabled, disable it on the tracer */ |
2499 | if (!ua_chan->enabled) { | |
2500 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2501 | if (ret < 0) { | |
2502 | goto error; | |
2503 | } | |
78f0bacd DG |
2504 | } |
2505 | ||
2506 | error: | |
2507 | return ret; | |
2508 | } | |
2509 | ||
284d8f55 | 2510 | /* |
4d710ac2 DG |
2511 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2512 | * newly created channel if not NULL. | |
d0b96690 | 2513 | * |
36b588ed | 2514 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2515 | * |
2516 | * Return 0 on success or else a negative value. | |
284d8f55 | 2517 | */ |
4d710ac2 DG |
2518 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2519 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2520 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2521 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2522 | { |
2523 | int ret = 0; | |
bec39940 DG |
2524 | struct lttng_ht_iter iter; |
2525 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2526 | struct ust_app_channel *ua_chan; |
2527 | ||
2528 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2529 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2530 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2531 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2532 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2533 | goto end; |
5b4a0ec0 DG |
2534 | } |
2535 | ||
d0b96690 | 2536 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2537 | if (ua_chan == NULL) { |
2538 | /* Only malloc can fail here */ | |
4d710ac2 | 2539 | ret = -ENOMEM; |
094d1690 | 2540 | goto error_alloc; |
fc34caaa DG |
2541 | } |
2542 | shadow_copy_channel(ua_chan, uchan); | |
2543 | ||
ffe60014 DG |
2544 | /* Set channel type. */ |
2545 | ua_chan->attr.type = type; | |
2546 | ||
7972aab2 | 2547 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2548 | if (ret < 0) { |
2549 | goto error; | |
2550 | } | |
2551 | ||
fc34caaa | 2552 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2553 | app->pid); |
fc34caaa | 2554 | |
d0b96690 DG |
2555 | /* Only add the channel if successful on the tracer side. */ |
2556 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2557 | ||
fc34caaa | 2558 | end: |
4d710ac2 DG |
2559 | if (ua_chanp) { |
2560 | *ua_chanp = ua_chan; | |
2561 | } | |
2562 | ||
2563 | /* Everything went well. */ | |
2564 | return 0; | |
5b4a0ec0 DG |
2565 | |
2566 | error: | |
d0b96690 | 2567 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2568 | error_alloc: |
4d710ac2 | 2569 | return ret; |
5b4a0ec0 DG |
2570 | } |
2571 | ||
2572 | /* | |
2573 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2574 | * |
2575 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2576 | */ |
edb67388 DG |
2577 | static |
2578 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2579 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2580 | struct ust_app *app) | |
284d8f55 | 2581 | { |
edb67388 | 2582 | int ret = 0; |
5b4a0ec0 | 2583 | struct ust_app_event *ua_event; |
284d8f55 | 2584 | |
5b4a0ec0 | 2585 | /* Get event node */ |
18eace3b DG |
2586 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
2587 | uevent->filter, uevent->attr.loglevel); | |
2588 | if (ua_event != NULL) { | |
fc34caaa | 2589 | ret = -EEXIST; |
edb67388 DG |
2590 | goto end; |
2591 | } | |
5b4a0ec0 | 2592 | |
edb67388 DG |
2593 | /* Does not exist so create one */ |
2594 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2595 | if (ua_event == NULL) { | |
2596 | /* Only malloc can failed so something is really wrong */ | |
2597 | ret = -ENOMEM; | |
fc34caaa | 2598 | goto end; |
5b4a0ec0 | 2599 | } |
edb67388 | 2600 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2601 | |
edb67388 | 2602 | /* Create it on the tracer side */ |
5b4a0ec0 | 2603 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2604 | if (ret < 0) { |
fc34caaa | 2605 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2606 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2607 | goto error; |
2608 | } | |
2609 | ||
d0b96690 | 2610 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2611 | |
fc34caaa | 2612 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2613 | app->pid); |
7f79d3a1 | 2614 | |
edb67388 | 2615 | end: |
fc34caaa DG |
2616 | return ret; |
2617 | ||
5b4a0ec0 | 2618 | error: |
fc34caaa DG |
2619 | /* Valid. Calling here is already in a read side lock */ |
2620 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2621 | return ret; |
5b4a0ec0 DG |
2622 | } |
2623 | ||
2624 | /* | |
2625 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2626 | * |
7972aab2 | 2627 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2628 | */ |
2629 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
d65d2de8 DG |
2630 | struct ust_app *app, struct consumer_output *consumer, |
2631 | struct ustctl_consumer_channel_attr *attr) | |
5b4a0ec0 DG |
2632 | { |
2633 | int ret = 0; | |
ffe60014 | 2634 | struct ust_app_channel *metadata; |
d88aee68 | 2635 | struct consumer_socket *socket; |
7972aab2 | 2636 | struct ust_registry_session *registry; |
5b4a0ec0 | 2637 | |
ffe60014 DG |
2638 | assert(ua_sess); |
2639 | assert(app); | |
d88aee68 | 2640 | assert(consumer); |
5b4a0ec0 | 2641 | |
7972aab2 DG |
2642 | registry = get_session_registry(ua_sess); |
2643 | assert(registry); | |
2644 | ||
1b532a60 DG |
2645 | /* Metadata already exists for this registry or it was closed previously */ |
2646 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2647 | ret = 0; |
2648 | goto error; | |
5b4a0ec0 DG |
2649 | } |
2650 | ||
ffe60014 | 2651 | /* Allocate UST metadata */ |
d0b96690 | 2652 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2653 | if (!metadata) { |
2654 | /* malloc() failed */ | |
2655 | ret = -ENOMEM; | |
2656 | goto error; | |
2657 | } | |
5b4a0ec0 | 2658 | |
d65d2de8 DG |
2659 | if (!attr) { |
2660 | /* Set default attributes for metadata. */ | |
2661 | metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
2662 | metadata->attr.subbuf_size = default_get_metadata_subbuf_size(); | |
2663 | metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
0a9c6494 DG |
2664 | metadata->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER; |
2665 | metadata->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER; | |
d65d2de8 DG |
2666 | metadata->attr.output = LTTNG_UST_MMAP; |
2667 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2668 | } else { | |
2669 | memcpy(&metadata->attr, attr, sizeof(metadata->attr)); | |
2670 | metadata->attr.output = LTTNG_UST_MMAP; | |
2671 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2672 | } | |
5b4a0ec0 | 2673 | |
7972aab2 DG |
2674 | /* Need one fd for the channel. */ |
2675 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2676 | if (ret < 0) { | |
2677 | ERR("Exhausted number of available FD upon create metadata"); | |
2678 | goto error; | |
2679 | } | |
2680 | ||
4dc3dfc5 DG |
2681 | /* Get the right consumer socket for the application. */ |
2682 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2683 | if (!socket) { | |
2684 | ret = -EINVAL; | |
2685 | goto error_consumer; | |
2686 | } | |
2687 | ||
331744e3 JD |
2688 | /* |
2689 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2690 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2691 | * consumer requesting the metadata and the ask_channel call on our side | |
2692 | * did not returned yet. | |
2693 | */ | |
2694 | registry->metadata_key = metadata->key; | |
2695 | ||
d88aee68 DG |
2696 | /* |
2697 | * Ask the metadata channel creation to the consumer. The metadata object | |
2698 | * will be created by the consumer and kept their. However, the stream is | |
2699 | * never added or monitored until we do a first push metadata to the | |
2700 | * consumer. | |
2701 | */ | |
7972aab2 DG |
2702 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2703 | registry); | |
d88aee68 | 2704 | if (ret < 0) { |
f2a444f1 DG |
2705 | /* Nullify the metadata key so we don't try to close it later on. */ |
2706 | registry->metadata_key = 0; | |
d88aee68 DG |
2707 | goto error_consumer; |
2708 | } | |
2709 | ||
2710 | /* | |
2711 | * The setup command will make the metadata stream be sent to the relayd, | |
2712 | * if applicable, and the thread managing the metadatas. This is important | |
2713 | * because after this point, if an error occurs, the only way the stream | |
2714 | * can be deleted is to be monitored in the consumer. | |
2715 | */ | |
7972aab2 | 2716 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2717 | if (ret < 0) { |
f2a444f1 DG |
2718 | /* Nullify the metadata key so we don't try to close it later on. */ |
2719 | registry->metadata_key = 0; | |
d88aee68 | 2720 | goto error_consumer; |
5b4a0ec0 DG |
2721 | } |
2722 | ||
7972aab2 DG |
2723 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2724 | metadata->key, app->pid); | |
5b4a0ec0 | 2725 | |
d88aee68 | 2726 | error_consumer: |
b80f0b6c | 2727 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2728 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2729 | error: |
ffe60014 | 2730 | return ret; |
5b4a0ec0 DG |
2731 | } |
2732 | ||
2733 | /* | |
2734 | * Return pointer to traceable apps list. | |
2735 | */ | |
bec39940 | 2736 | struct lttng_ht *ust_app_get_ht(void) |
5b4a0ec0 DG |
2737 | { |
2738 | return ust_app_ht; | |
2739 | } | |
2740 | ||
2741 | /* | |
d88aee68 DG |
2742 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2743 | * acquired before calling this function. | |
5b4a0ec0 DG |
2744 | */ |
2745 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2746 | { | |
d88aee68 | 2747 | struct ust_app *app = NULL; |
bec39940 DG |
2748 | struct lttng_ht_node_ulong *node; |
2749 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2750 | |
bec39940 DG |
2751 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2752 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2753 | if (node == NULL) { |
2754 | DBG2("UST app no found with pid %d", pid); | |
2755 | goto error; | |
2756 | } | |
5b4a0ec0 DG |
2757 | |
2758 | DBG2("Found UST app by pid %d", pid); | |
2759 | ||
d88aee68 | 2760 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2761 | |
2762 | error: | |
d88aee68 | 2763 | return app; |
5b4a0ec0 DG |
2764 | } |
2765 | ||
d88aee68 DG |
2766 | /* |
2767 | * Allocate and init an UST app object using the registration information and | |
2768 | * the command socket. This is called when the command socket connects to the | |
2769 | * session daemon. | |
2770 | * | |
2771 | * The object is returned on success or else NULL. | |
2772 | */ | |
d0b96690 | 2773 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2774 | { |
d0b96690 DG |
2775 | struct ust_app *lta = NULL; |
2776 | ||
2777 | assert(msg); | |
2778 | assert(sock >= 0); | |
2779 | ||
2780 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2781 | |
173af62f DG |
2782 | if ((msg->bits_per_long == 64 && |
2783 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2784 | || (msg->bits_per_long == 32 && | |
2785 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2786 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2787 | "%d-bit long, but no consumerd for this size is available.\n", |
2788 | msg->name, msg->pid, msg->bits_per_long); | |
2789 | goto error; | |
3f2c5fcc | 2790 | } |
d0b96690 | 2791 | |
5b4a0ec0 DG |
2792 | lta = zmalloc(sizeof(struct ust_app)); |
2793 | if (lta == NULL) { | |
2794 | PERROR("malloc"); | |
d0b96690 | 2795 | goto error; |
5b4a0ec0 DG |
2796 | } |
2797 | ||
2798 | lta->ppid = msg->ppid; | |
2799 | lta->uid = msg->uid; | |
2800 | lta->gid = msg->gid; | |
d0b96690 | 2801 | |
7753dea8 | 2802 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2803 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2804 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2805 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2806 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2807 | lta->long_alignment = msg->long_alignment; | |
2808 | lta->byte_order = msg->byte_order; | |
2809 | ||
5b4a0ec0 DG |
2810 | lta->v_major = msg->major; |
2811 | lta->v_minor = msg->minor; | |
77c5447b | 2812 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
2813 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2814 | lta->notify_sock = -1; | |
d88aee68 DG |
2815 | |
2816 | /* Copy name and make sure it's NULL terminated. */ | |
2817 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2818 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2819 | ||
2820 | /* | |
2821 | * Before this can be called, when receiving the registration information, | |
2822 | * the application compatibility is checked. So, at this point, the | |
2823 | * application can work with this session daemon. | |
2824 | */ | |
d0b96690 | 2825 | lta->compatible = 1; |
5b4a0ec0 | 2826 | |
852d0037 | 2827 | lta->pid = msg->pid; |
d0b96690 | 2828 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2829 | lta->sock = sock; |
d0b96690 | 2830 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2831 | |
d42f20df DG |
2832 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2833 | ||
d0b96690 DG |
2834 | error: |
2835 | return lta; | |
2836 | } | |
2837 | ||
d88aee68 DG |
2838 | /* |
2839 | * For a given application object, add it to every hash table. | |
2840 | */ | |
d0b96690 DG |
2841 | void ust_app_add(struct ust_app *app) |
2842 | { | |
2843 | assert(app); | |
2844 | assert(app->notify_sock >= 0); | |
2845 | ||
5b4a0ec0 | 2846 | rcu_read_lock(); |
852d0037 DG |
2847 | |
2848 | /* | |
2849 | * On a re-registration, we want to kick out the previous registration of | |
2850 | * that pid | |
2851 | */ | |
d0b96690 | 2852 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
2853 | |
2854 | /* | |
2855 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
2856 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
2857 | * already in the table. | |
2858 | */ | |
d0b96690 | 2859 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 2860 | |
d0b96690 DG |
2861 | /* Add application to the notify socket hash table. */ |
2862 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
2863 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 2864 | |
d0b96690 | 2865 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
2866 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
2867 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
2868 | app->v_minor); | |
5b4a0ec0 | 2869 | |
d0b96690 DG |
2870 | rcu_read_unlock(); |
2871 | } | |
2872 | ||
d88aee68 DG |
2873 | /* |
2874 | * Set the application version into the object. | |
2875 | * | |
2876 | * Return 0 on success else a negative value either an errno code or a | |
2877 | * LTTng-UST error code. | |
2878 | */ | |
d0b96690 DG |
2879 | int ust_app_version(struct ust_app *app) |
2880 | { | |
d88aee68 DG |
2881 | int ret; |
2882 | ||
d0b96690 | 2883 | assert(app); |
d88aee68 DG |
2884 | |
2885 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2886 | if (ret < 0) { | |
2887 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2888 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2889 | } else { | |
2890 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2891 | } | |
2892 | } | |
2893 | ||
2894 | return ret; | |
5b4a0ec0 DG |
2895 | } |
2896 | ||
2897 | /* | |
2898 | * Unregister app by removing it from the global traceable app list and freeing | |
2899 | * the data struct. | |
2900 | * | |
2901 | * The socket is already closed at this point so no close to sock. | |
2902 | */ | |
2903 | void ust_app_unregister(int sock) | |
2904 | { | |
2905 | struct ust_app *lta; | |
bec39940 DG |
2906 | struct lttng_ht_node_ulong *node; |
2907 | struct lttng_ht_iter iter; | |
d42f20df | 2908 | struct ust_app_session *ua_sess; |
525b0740 | 2909 | int ret; |
5b4a0ec0 DG |
2910 | |
2911 | rcu_read_lock(); | |
886459c6 | 2912 | |
5b4a0ec0 | 2913 | /* Get the node reference for a call_rcu */ |
852d0037 | 2914 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 2915 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 2916 | assert(node); |
284d8f55 | 2917 | |
852d0037 | 2918 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
2919 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
2920 | ||
886459c6 | 2921 | /* Remove application from PID hash table */ |
852d0037 DG |
2922 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
2923 | assert(!ret); | |
2924 | ||
d88aee68 DG |
2925 | /* |
2926 | * Remove application from notify hash table. The thread handling the | |
2927 | * notify socket could have deleted the node so ignore on error because | |
2928 | * either way it's valid. The close of that socket is handled by the other | |
2929 | * thread. | |
2930 | */ | |
d0b96690 | 2931 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 2932 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 2933 | |
5b98a774 DG |
2934 | /* |
2935 | * Ignore return value since the node might have been removed before by an | |
2936 | * add replace during app registration because the PID can be reassigned by | |
2937 | * the OS. | |
2938 | */ | |
d0b96690 | 2939 | iter.iter.node = <a->pid_n.node; |
bec39940 | 2940 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
2941 | if (ret) { |
2942 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
2943 | lta->pid); | |
2944 | } | |
852d0037 | 2945 | |
d42f20df DG |
2946 | /* Remove sessions so they are not visible during deletion.*/ |
2947 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
2948 | node.node) { | |
7972aab2 DG |
2949 | struct ust_registry_session *registry; |
2950 | ||
d42f20df DG |
2951 | ret = lttng_ht_del(lta->sessions, &iter); |
2952 | if (ret) { | |
2953 | /* The session was already removed so scheduled for teardown. */ | |
2954 | continue; | |
2955 | } | |
2956 | ||
2957 | /* | |
2958 | * Add session to list for teardown. This is safe since at this point we | |
2959 | * are the only one using this list. | |
2960 | */ | |
d88aee68 DG |
2961 | pthread_mutex_lock(&ua_sess->lock); |
2962 | ||
2963 | /* | |
2964 | * Normally, this is done in the delete session process which is | |
2965 | * executed in the call rcu below. However, upon registration we can't | |
2966 | * afford to wait for the grace period before pushing data or else the | |
2967 | * data pending feature can race between the unregistration and stop | |
2968 | * command where the data pending command is sent *before* the grace | |
2969 | * period ended. | |
2970 | * | |
2971 | * The close metadata below nullifies the metadata pointer in the | |
2972 | * session so the delete session will NOT push/close a second time. | |
2973 | */ | |
7972aab2 | 2974 | registry = get_session_registry(ua_sess); |
1b532a60 | 2975 | if (registry && !registry->metadata_closed) { |
7972aab2 DG |
2976 | /* Push metadata for application before freeing the application. */ |
2977 | (void) push_metadata(registry, ua_sess->consumer); | |
2978 | ||
2979 | /* | |
2980 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
2981 | * metadata only on destroy trace session in this case. Also, the |
2982 | * previous push metadata could have flag the metadata registry to | |
2983 | * close so don't send a close command if closed. | |
7972aab2 | 2984 | */ |
1b532a60 DG |
2985 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
2986 | !registry->metadata_closed) { | |
7972aab2 DG |
2987 | /* And ask to close it for this session registry. */ |
2988 | (void) close_metadata(registry, ua_sess->consumer); | |
2989 | } | |
2990 | } | |
d88aee68 | 2991 | |
d42f20df | 2992 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 2993 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
2994 | } |
2995 | ||
852d0037 DG |
2996 | /* Free memory */ |
2997 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
2998 | ||
5b4a0ec0 DG |
2999 | rcu_read_unlock(); |
3000 | return; | |
284d8f55 DG |
3001 | } |
3002 | ||
3003 | /* | |
5b4a0ec0 | 3004 | * Return traceable_app_count |
284d8f55 | 3005 | */ |
5b4a0ec0 | 3006 | unsigned long ust_app_list_count(void) |
284d8f55 | 3007 | { |
5b4a0ec0 | 3008 | unsigned long count; |
284d8f55 | 3009 | |
5b4a0ec0 | 3010 | rcu_read_lock(); |
bec39940 | 3011 | count = lttng_ht_get_count(ust_app_ht); |
5b4a0ec0 | 3012 | rcu_read_unlock(); |
284d8f55 | 3013 | |
5b4a0ec0 | 3014 | return count; |
284d8f55 DG |
3015 | } |
3016 | ||
5b4a0ec0 DG |
3017 | /* |
3018 | * Fill events array with all events name of all registered apps. | |
3019 | */ | |
3020 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3021 | { |
5b4a0ec0 DG |
3022 | int ret, handle; |
3023 | size_t nbmem, count = 0; | |
bec39940 | 3024 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3025 | struct ust_app *app; |
c617c0c6 | 3026 | struct lttng_event *tmp_event; |
421cb601 | 3027 | |
5b4a0ec0 | 3028 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3029 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3030 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3031 | PERROR("zmalloc ust app events"); |
3032 | ret = -ENOMEM; | |
421cb601 DG |
3033 | goto error; |
3034 | } | |
3035 | ||
5b4a0ec0 | 3036 | rcu_read_lock(); |
421cb601 | 3037 | |
852d0037 | 3038 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3039 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3040 | |
840cb59c | 3041 | health_code_update(); |
86acf0da | 3042 | |
e0c7ec2b DG |
3043 | if (!app->compatible) { |
3044 | /* | |
3045 | * TODO: In time, we should notice the caller of this error by | |
3046 | * telling him that this is a version error. | |
3047 | */ | |
3048 | continue; | |
3049 | } | |
852d0037 | 3050 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3051 | if (handle < 0) { |
ffe60014 DG |
3052 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3053 | ERR("UST app list events getting handle failed for app pid %d", | |
3054 | app->pid); | |
3055 | } | |
5b4a0ec0 DG |
3056 | continue; |
3057 | } | |
421cb601 | 3058 | |
852d0037 | 3059 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3060 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3061 | /* Handle ustctl error. */ |
3062 | if (ret < 0) { | |
3063 | free(tmp_event); | |
3064 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3065 | ERR("UST app tp list get failed for app %d with ret %d", | |
3066 | app->sock, ret); | |
3067 | } else { | |
3068 | DBG3("UST app tp list get failed. Application is dead"); | |
47cb9d4a DG |
3069 | /* |
3070 | * This is normal behavior, an application can die during the | |
3071 | * creation process. Don't report an error so the execution can | |
3072 | * continue normally. Continue normal execution. | |
3073 | */ | |
3074 | break; | |
ffe60014 DG |
3075 | } |
3076 | goto rcu_error; | |
3077 | } | |
3078 | ||
840cb59c | 3079 | health_code_update(); |
815564d8 | 3080 | if (count >= nbmem) { |
d7b3776f | 3081 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3082 | void *ptr; |
3083 | ||
815564d8 MD |
3084 | DBG2("Reallocating event list from %zu to %zu entries", nbmem, |
3085 | 2 * nbmem); | |
3086 | nbmem *= 2; | |
c617c0c6 MD |
3087 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event)); |
3088 | if (ptr == NULL) { | |
5b4a0ec0 | 3089 | PERROR("realloc ust app events"); |
c617c0c6 | 3090 | free(tmp_event); |
5b4a0ec0 DG |
3091 | ret = -ENOMEM; |
3092 | goto rcu_error; | |
3093 | } | |
c617c0c6 | 3094 | tmp_event = ptr; |
5b4a0ec0 | 3095 | } |
c617c0c6 MD |
3096 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3097 | tmp_event[count].loglevel = uiter.loglevel; | |
3098 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3099 | tmp_event[count].pid = app->pid; | |
3100 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3101 | count++; |
421cb601 | 3102 | } |
421cb601 DG |
3103 | } |
3104 | ||
5b4a0ec0 | 3105 | ret = count; |
c617c0c6 | 3106 | *events = tmp_event; |
421cb601 | 3107 | |
5b4a0ec0 | 3108 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3109 | |
5b4a0ec0 DG |
3110 | rcu_error: |
3111 | rcu_read_unlock(); | |
421cb601 | 3112 | error: |
840cb59c | 3113 | health_code_update(); |
5b4a0ec0 | 3114 | return ret; |
421cb601 DG |
3115 | } |
3116 | ||
f37d259d MD |
3117 | /* |
3118 | * Fill events array with all events name of all registered apps. | |
3119 | */ | |
3120 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3121 | { | |
3122 | int ret, handle; | |
3123 | size_t nbmem, count = 0; | |
3124 | struct lttng_ht_iter iter; | |
3125 | struct ust_app *app; | |
c617c0c6 | 3126 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3127 | |
3128 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3129 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3130 | if (tmp_event == NULL) { | |
f37d259d MD |
3131 | PERROR("zmalloc ust app event fields"); |
3132 | ret = -ENOMEM; | |
3133 | goto error; | |
3134 | } | |
3135 | ||
3136 | rcu_read_lock(); | |
3137 | ||
3138 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3139 | struct lttng_ust_field_iter uiter; | |
3140 | ||
840cb59c | 3141 | health_code_update(); |
86acf0da | 3142 | |
f37d259d MD |
3143 | if (!app->compatible) { |
3144 | /* | |
3145 | * TODO: In time, we should notice the caller of this error by | |
3146 | * telling him that this is a version error. | |
3147 | */ | |
3148 | continue; | |
3149 | } | |
3150 | handle = ustctl_tracepoint_field_list(app->sock); | |
3151 | if (handle < 0) { | |
ffe60014 DG |
3152 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3153 | ERR("UST app list field getting handle failed for app pid %d", | |
3154 | app->pid); | |
3155 | } | |
f37d259d MD |
3156 | continue; |
3157 | } | |
3158 | ||
3159 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3160 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3161 | /* Handle ustctl error. */ |
3162 | if (ret < 0) { | |
3163 | free(tmp_event); | |
3164 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3165 | ERR("UST app tp list field failed for app %d with ret %d", | |
3166 | app->sock, ret); | |
3167 | } else { | |
3168 | DBG3("UST app tp list field failed. Application is dead"); | |
47cb9d4a DG |
3169 | /* |
3170 | * This is normal behavior, an application can die during the | |
3171 | * creation process. Don't report an error so the execution can | |
3172 | * continue normally. | |
3173 | */ | |
3174 | break; | |
ffe60014 DG |
3175 | } |
3176 | goto rcu_error; | |
3177 | } | |
3178 | ||
840cb59c | 3179 | health_code_update(); |
f37d259d | 3180 | if (count >= nbmem) { |
d7b3776f | 3181 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3182 | void *ptr; |
3183 | ||
f37d259d MD |
3184 | DBG2("Reallocating event field list from %zu to %zu entries", nbmem, |
3185 | 2 * nbmem); | |
3186 | nbmem *= 2; | |
c617c0c6 MD |
3187 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field)); |
3188 | if (ptr == NULL) { | |
f37d259d | 3189 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3190 | free(tmp_event); |
f37d259d MD |
3191 | ret = -ENOMEM; |
3192 | goto rcu_error; | |
3193 | } | |
c617c0c6 | 3194 | tmp_event = ptr; |
f37d259d | 3195 | } |
f37d259d | 3196 | |
c617c0c6 | 3197 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
13d9b823 DG |
3198 | /* Mapping between these enums matches 1 to 1. */ |
3199 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3200 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3201 | |
c617c0c6 MD |
3202 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3203 | tmp_event[count].event.loglevel = uiter.loglevel; | |
13d9b823 | 3204 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3205 | tmp_event[count].event.pid = app->pid; |
3206 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3207 | count++; |
3208 | } | |
3209 | } | |
3210 | ||
3211 | ret = count; | |
c617c0c6 | 3212 | *fields = tmp_event; |
f37d259d MD |
3213 | |
3214 | DBG2("UST app list event fields done (%zu events)", count); | |
3215 | ||
3216 | rcu_error: | |
3217 | rcu_read_unlock(); | |
3218 | error: | |
840cb59c | 3219 | health_code_update(); |
f37d259d MD |
3220 | return ret; |
3221 | } | |
3222 | ||
5b4a0ec0 DG |
3223 | /* |
3224 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3225 | * |
3226 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3227 | */ |
3228 | void ust_app_clean_list(void) | |
421cb601 | 3229 | { |
5b4a0ec0 | 3230 | int ret; |
659ed79f | 3231 | struct ust_app *app; |
bec39940 | 3232 | struct lttng_ht_iter iter; |
421cb601 | 3233 | |
5b4a0ec0 | 3234 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3235 | |
5b4a0ec0 | 3236 | rcu_read_lock(); |
421cb601 | 3237 | |
659ed79f | 3238 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3239 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3240 | assert(!ret); |
659ed79f | 3241 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3242 | } |
3243 | ||
852d0037 | 3244 | /* Cleanup socket hash table */ |
659ed79f DG |
3245 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3246 | sock_n.node) { | |
852d0037 | 3247 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3248 | assert(!ret); |
3249 | } | |
852d0037 | 3250 | |
d88aee68 DG |
3251 | /* Cleanup notify socket hash table */ |
3252 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3253 | notify_sock_n.node) { | |
3254 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3255 | assert(!ret); | |
3256 | } | |
36b588ed | 3257 | rcu_read_unlock(); |
d88aee68 | 3258 | |
bec39940 | 3259 | /* Destroy is done only when the ht is empty */ |
0b2dc8df MD |
3260 | ht_cleanup_push(ust_app_ht); |
3261 | ht_cleanup_push(ust_app_ht_by_sock); | |
3262 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
5b4a0ec0 DG |
3263 | } |
3264 | ||
3265 | /* | |
3266 | * Init UST app hash table. | |
3267 | */ | |
3268 | void ust_app_ht_alloc(void) | |
3269 | { | |
bec39940 | 3270 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3271 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3272 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3273 | } |
3274 | ||
78f0bacd DG |
3275 | /* |
3276 | * For a specific UST session, disable the channel for all registered apps. | |
3277 | */ | |
35a9059d | 3278 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3279 | struct ltt_ust_channel *uchan) |
3280 | { | |
3281 | int ret = 0; | |
bec39940 DG |
3282 | struct lttng_ht_iter iter; |
3283 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3284 | struct ust_app *app; |
3285 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3286 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3287 | |
3288 | if (usess == NULL || uchan == NULL) { | |
3289 | ERR("Disabling UST global channel with NULL values"); | |
3290 | ret = -1; | |
3291 | goto error; | |
3292 | } | |
3293 | ||
77c5447b | 3294 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3295 | uchan->name, usess->id); |
78f0bacd DG |
3296 | |
3297 | rcu_read_lock(); | |
3298 | ||
3299 | /* For every registered applications */ | |
852d0037 | 3300 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3301 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3302 | if (!app->compatible) { |
3303 | /* | |
3304 | * TODO: In time, we should notice the caller of this error by | |
3305 | * telling him that this is a version error. | |
3306 | */ | |
3307 | continue; | |
3308 | } | |
78f0bacd DG |
3309 | ua_sess = lookup_session_by_app(usess, app); |
3310 | if (ua_sess == NULL) { | |
3311 | continue; | |
3312 | } | |
3313 | ||
8535a6d9 | 3314 | /* Get channel */ |
bec39940 DG |
3315 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3316 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3317 | /* If the session if found for the app, the channel must be there */ |
3318 | assert(ua_chan_node); | |
3319 | ||
3320 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3321 | /* The channel must not be already disabled */ | |
3322 | assert(ua_chan->enabled == 1); | |
3323 | ||
3324 | /* Disable channel onto application */ | |
3325 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3326 | if (ret < 0) { |
3327 | /* XXX: We might want to report this error at some point... */ | |
3328 | continue; | |
3329 | } | |
3330 | } | |
3331 | ||
3332 | rcu_read_unlock(); | |
3333 | ||
3334 | error: | |
3335 | return ret; | |
3336 | } | |
3337 | ||
3338 | /* | |
3339 | * For a specific UST session, enable the channel for all registered apps. | |
3340 | */ | |
35a9059d | 3341 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3342 | struct ltt_ust_channel *uchan) |
3343 | { | |
3344 | int ret = 0; | |
bec39940 | 3345 | struct lttng_ht_iter iter; |
78f0bacd DG |
3346 | struct ust_app *app; |
3347 | struct ust_app_session *ua_sess; | |
3348 | ||
3349 | if (usess == NULL || uchan == NULL) { | |
3350 | ERR("Adding UST global channel to NULL values"); | |
3351 | ret = -1; | |
3352 | goto error; | |
3353 | } | |
3354 | ||
77c5447b | 3355 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3356 | uchan->name, usess->id); |
78f0bacd DG |
3357 | |
3358 | rcu_read_lock(); | |
3359 | ||
3360 | /* For every registered applications */ | |
852d0037 | 3361 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3362 | if (!app->compatible) { |
3363 | /* | |
3364 | * TODO: In time, we should notice the caller of this error by | |
3365 | * telling him that this is a version error. | |
3366 | */ | |
3367 | continue; | |
3368 | } | |
78f0bacd DG |
3369 | ua_sess = lookup_session_by_app(usess, app); |
3370 | if (ua_sess == NULL) { | |
3371 | continue; | |
3372 | } | |
3373 | ||
3374 | /* Enable channel onto application */ | |
3375 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3376 | if (ret < 0) { | |
3377 | /* XXX: We might want to report this error at some point... */ | |
3378 | continue; | |
3379 | } | |
3380 | } | |
3381 | ||
3382 | rcu_read_unlock(); | |
3383 | ||
3384 | error: | |
3385 | return ret; | |
3386 | } | |
3387 | ||
b0a40d28 DG |
3388 | /* |
3389 | * Disable an event in a channel and for a specific session. | |
3390 | */ | |
35a9059d DG |
3391 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3392 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3393 | { |
3394 | int ret = 0; | |
bec39940 DG |
3395 | struct lttng_ht_iter iter, uiter; |
3396 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3397 | struct ust_app *app; |
3398 | struct ust_app_session *ua_sess; | |
3399 | struct ust_app_channel *ua_chan; | |
3400 | struct ust_app_event *ua_event; | |
3401 | ||
3402 | DBG("UST app disabling event %s for all apps in channel " | |
77c5447b MD |
3403 | "%s for session id %" PRIu64, |
3404 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3405 | |
3406 | rcu_read_lock(); | |
3407 | ||
3408 | /* For all registered applications */ | |
852d0037 | 3409 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3410 | if (!app->compatible) { |
3411 | /* | |
3412 | * TODO: In time, we should notice the caller of this error by | |
3413 | * telling him that this is a version error. | |
3414 | */ | |
3415 | continue; | |
3416 | } | |
b0a40d28 DG |
3417 | ua_sess = lookup_session_by_app(usess, app); |
3418 | if (ua_sess == NULL) { | |
3419 | /* Next app */ | |
3420 | continue; | |
3421 | } | |
3422 | ||
3423 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3424 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3425 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3426 | if (ua_chan_node == NULL) { |
77c5447b | 3427 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3428 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3429 | continue; |
3430 | } | |
3431 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3432 | ||
bec39940 DG |
3433 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3434 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3435 | if (ua_event_node == NULL) { |
3436 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3437 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3438 | continue; |
3439 | } | |
3440 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3441 | ||
7f79d3a1 | 3442 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3443 | if (ret < 0) { |
3444 | /* XXX: Report error someday... */ | |
3445 | continue; | |
3446 | } | |
3447 | } | |
3448 | ||
3449 | rcu_read_unlock(); | |
3450 | ||
3451 | return ret; | |
3452 | } | |
3453 | ||
9730260e | 3454 | /* |
edb67388 | 3455 | * For a specific UST session and UST channel, the event for all |
9730260e DG |
3456 | * registered apps. |
3457 | */ | |
35a9059d | 3458 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
9730260e DG |
3459 | struct ltt_ust_channel *uchan) |
3460 | { | |
3461 | int ret = 0; | |
bec39940 DG |
3462 | struct lttng_ht_iter iter, uiter; |
3463 | struct lttng_ht_node_str *ua_chan_node; | |
9730260e DG |
3464 | struct ust_app *app; |
3465 | struct ust_app_session *ua_sess; | |
3466 | struct ust_app_channel *ua_chan; | |
3467 | struct ust_app_event *ua_event; | |
3468 | ||
3469 | DBG("UST app disabling all event for all apps in channel " | |
77c5447b | 3470 | "%s for session id %" PRIu64, uchan->name, usess->id); |
9730260e 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 | } | |
9730260e | 3483 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3484 | if (!ua_sess) { |
3485 | /* The application has problem or is probably dead. */ | |
3486 | continue; | |
3487 | } | |
9730260e DG |
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); | |
edb67388 DG |
3492 | /* If the channel is not found, there is a code flow error */ |
3493 | assert(ua_chan_node); | |
3494 | ||
9730260e DG |
3495 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3496 | ||
3497 | /* Disable each events of channel */ | |
bec39940 DG |
3498 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3499 | node.node) { | |
7f79d3a1 | 3500 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
9730260e DG |
3501 | if (ret < 0) { |
3502 | /* XXX: Report error someday... */ | |
3503 | continue; | |
3504 | } | |
3505 | } | |
3506 | } | |
3507 | ||
3508 | rcu_read_unlock(); | |
3509 | ||
3510 | return ret; | |
3511 | } | |
3512 | ||
421cb601 | 3513 | /* |
5b4a0ec0 | 3514 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3515 | */ |
35a9059d | 3516 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3517 | struct ltt_ust_channel *uchan) |
3518 | { | |
3d8ca23b | 3519 | int ret = 0, created; |
bec39940 | 3520 | struct lttng_ht_iter iter; |
48842b30 | 3521 | struct ust_app *app; |
3d8ca23b | 3522 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3523 | |
fc34caaa DG |
3524 | /* Very wrong code flow */ |
3525 | assert(usess); | |
3526 | assert(uchan); | |
421cb601 | 3527 | |
77c5447b | 3528 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3529 | uchan->name, usess->id); |
48842b30 DG |
3530 | |
3531 | rcu_read_lock(); | |
421cb601 | 3532 | |
5b4a0ec0 | 3533 | /* For every registered applications */ |
852d0037 | 3534 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3535 | if (!app->compatible) { |
3536 | /* | |
3537 | * TODO: In time, we should notice the caller of this error by | |
3538 | * telling him that this is a version error. | |
3539 | */ | |
3540 | continue; | |
3541 | } | |
edb67388 DG |
3542 | /* |
3543 | * Create session on the tracer side and add it to app session HT. Note | |
3544 | * that if session exist, it will simply return a pointer to the ust | |
3545 | * app session. | |
3546 | */ | |
3d8ca23b DG |
3547 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3548 | if (ret < 0) { | |
3549 | switch (ret) { | |
3550 | case -ENOTCONN: | |
3551 | /* | |
3552 | * The application's socket is not valid. Either a bad socket | |
3553 | * or a timeout on it. We can't inform the caller that for a | |
3554 | * specific app, the session failed so lets continue here. | |
3555 | */ | |
3556 | continue; | |
3557 | case -ENOMEM: | |
3558 | default: | |
3559 | goto error_rcu_unlock; | |
3560 | } | |
48842b30 | 3561 | } |
3d8ca23b | 3562 | assert(ua_sess); |
48842b30 | 3563 | |
d0b96690 | 3564 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3565 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3566 | sizeof(uchan->name))) { | |
3567 | struct ustctl_consumer_channel_attr attr; | |
3568 | copy_channel_attr_to_ustctl(&attr, &uchan->attr); | |
3569 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
3570 | &attr); | |
3571 | } else { | |
3572 | /* Create channel onto application. We don't need the chan ref. */ | |
3573 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3574 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3575 | } | |
d0b96690 | 3576 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3577 | if (ret < 0) { |
3578 | if (ret == -ENOMEM) { | |
3579 | /* No more memory is a fatal error. Stop right now. */ | |
3580 | goto error_rcu_unlock; | |
3581 | } | |
3582 | /* Cleanup the created session if it's the case. */ | |
3583 | if (created) { | |
d0b96690 | 3584 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3585 | } |
48842b30 | 3586 | } |
48842b30 | 3587 | } |
5b4a0ec0 | 3588 | |
95e047ff | 3589 | error_rcu_unlock: |
48842b30 | 3590 | rcu_read_unlock(); |
3c14c33f | 3591 | return ret; |
48842b30 DG |
3592 | } |
3593 | ||
5b4a0ec0 | 3594 | /* |
edb67388 | 3595 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3596 | */ |
35a9059d | 3597 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3598 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3599 | { | |
3600 | int ret = 0; | |
bec39940 | 3601 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3602 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3603 | struct ust_app *app; |
3604 | struct ust_app_session *ua_sess; | |
3605 | struct ust_app_channel *ua_chan; | |
3606 | struct ust_app_event *ua_event; | |
48842b30 | 3607 | |
77c5447b | 3608 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3609 | uevent->attr.name, usess->id); |
48842b30 | 3610 | |
edb67388 DG |
3611 | /* |
3612 | * NOTE: At this point, this function is called only if the session and | |
3613 | * channel passed are already created for all apps. and enabled on the | |
3614 | * tracer also. | |
3615 | */ | |
3616 | ||
48842b30 | 3617 | rcu_read_lock(); |
421cb601 DG |
3618 | |
3619 | /* For all registered applications */ | |
852d0037 | 3620 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3621 | if (!app->compatible) { |
3622 | /* | |
3623 | * TODO: In time, we should notice the caller of this error by | |
3624 | * telling him that this is a version error. | |
3625 | */ | |
3626 | continue; | |
3627 | } | |
edb67388 | 3628 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3629 | if (!ua_sess) { |
3630 | /* The application has problem or is probably dead. */ | |
3631 | continue; | |
3632 | } | |
ba767faf | 3633 | |
d0b96690 DG |
3634 | pthread_mutex_lock(&ua_sess->lock); |
3635 | ||
edb67388 | 3636 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3637 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3638 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3639 | /* If the channel is not found, there is a code flow error */ |
3640 | assert(ua_chan_node); | |
3641 | ||
3642 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3643 | ||
18eace3b DG |
3644 | /* Get event node */ |
3645 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
3646 | uevent->filter, uevent->attr.loglevel); | |
3647 | if (ua_event == NULL) { | |
7f79d3a1 | 3648 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3649 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3650 | goto next_app; |
35a9059d | 3651 | } |
35a9059d DG |
3652 | |
3653 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3654 | if (ret < 0) { | |
d0b96690 | 3655 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3656 | goto error; |
48842b30 | 3657 | } |
d0b96690 DG |
3658 | next_app: |
3659 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3660 | } |
3661 | ||
7f79d3a1 | 3662 | error: |
edb67388 | 3663 | rcu_read_unlock(); |
edb67388 DG |
3664 | return ret; |
3665 | } | |
3666 | ||
3667 | /* | |
3668 | * For a specific existing UST session and UST channel, creates the event for | |
3669 | * all registered apps. | |
3670 | */ | |
35a9059d | 3671 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3672 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3673 | { | |
3674 | int ret = 0; | |
bec39940 DG |
3675 | struct lttng_ht_iter iter, uiter; |
3676 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3677 | struct ust_app *app; |
3678 | struct ust_app_session *ua_sess; | |
3679 | struct ust_app_channel *ua_chan; | |
3680 | ||
77c5447b | 3681 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3682 | uevent->attr.name, usess->id); |
edb67388 | 3683 | |
edb67388 DG |
3684 | rcu_read_lock(); |
3685 | ||
3686 | /* For all registered applications */ | |
852d0037 | 3687 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3688 | if (!app->compatible) { |
3689 | /* | |
3690 | * TODO: In time, we should notice the caller of this error by | |
3691 | * telling him that this is a version error. | |
3692 | */ | |
3693 | continue; | |
3694 | } | |
edb67388 | 3695 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3696 | if (!ua_sess) { |
3697 | /* The application has problem or is probably dead. */ | |
3698 | continue; | |
3699 | } | |
48842b30 | 3700 | |
d0b96690 | 3701 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 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 | ||
48842b30 DG |
3708 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3709 | ||
edb67388 | 3710 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3711 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3712 | if (ret < 0) { |
49c336c1 | 3713 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3714 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3715 | break; | |
3716 | } | |
3717 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3718 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3719 | continue; |
48842b30 | 3720 | } |
48842b30 | 3721 | } |
5b4a0ec0 | 3722 | |
48842b30 DG |
3723 | rcu_read_unlock(); |
3724 | ||
3725 | return ret; | |
3726 | } | |
3727 | ||
5b4a0ec0 DG |
3728 | /* |
3729 | * Start tracing for a specific UST session and app. | |
3730 | */ | |
b34cbebf | 3731 | static |
421cb601 | 3732 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3733 | { |
3734 | int ret = 0; | |
48842b30 | 3735 | struct ust_app_session *ua_sess; |
48842b30 | 3736 | |
852d0037 | 3737 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3738 | |
509cbaf8 MD |
3739 | rcu_read_lock(); |
3740 | ||
e0c7ec2b DG |
3741 | if (!app->compatible) { |
3742 | goto end; | |
3743 | } | |
3744 | ||
421cb601 DG |
3745 | ua_sess = lookup_session_by_app(usess, app); |
3746 | if (ua_sess == NULL) { | |
d42f20df DG |
3747 | /* The session is in teardown process. Ignore and continue. */ |
3748 | goto end; | |
421cb601 | 3749 | } |
48842b30 | 3750 | |
d0b96690 DG |
3751 | pthread_mutex_lock(&ua_sess->lock); |
3752 | ||
aea829b3 DG |
3753 | /* Upon restart, we skip the setup, already done */ |
3754 | if (ua_sess->started) { | |
8be98f9a | 3755 | goto skip_setup; |
aea829b3 | 3756 | } |
8be98f9a | 3757 | |
a4b92340 DG |
3758 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3759 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3760 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3761 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3762 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3763 | if (ret < 0) { |
3764 | if (ret != -EEXIST) { | |
3765 | ERR("Trace directory creation error"); | |
d0b96690 | 3766 | goto error_unlock; |
421cb601 | 3767 | } |
173af62f | 3768 | } |
7753dea8 | 3769 | } |
aea829b3 | 3770 | |
d65d2de8 DG |
3771 | /* |
3772 | * Create the metadata for the application. This returns gracefully if a | |
3773 | * metadata was already set for the session. | |
3774 | */ | |
3775 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, NULL); | |
421cb601 | 3776 | if (ret < 0) { |
d0b96690 | 3777 | goto error_unlock; |
421cb601 | 3778 | } |
48842b30 | 3779 | |
840cb59c | 3780 | health_code_update(); |
86acf0da | 3781 | |
8be98f9a | 3782 | skip_setup: |
421cb601 | 3783 | /* This start the UST tracing */ |
852d0037 | 3784 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3785 | if (ret < 0) { |
ffe60014 DG |
3786 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3787 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3788 | app->pid, ret); | |
3789 | } else { | |
3790 | DBG("UST app start session failed. Application is dead."); | |
47cb9d4a DG |
3791 | /* |
3792 | * This is normal behavior, an application can die during the | |
3793 | * creation process. Don't report an error so the execution can | |
3794 | * continue normally. | |
3795 | */ | |
3796 | pthread_mutex_unlock(&ua_sess->lock); | |
3797 | goto end; | |
ffe60014 | 3798 | } |
d0b96690 | 3799 | goto error_unlock; |
421cb601 | 3800 | } |
5b4a0ec0 | 3801 | |
55c3953d DG |
3802 | /* Indicate that the session has been started once */ |
3803 | ua_sess->started = 1; | |
3804 | ||
d0b96690 DG |
3805 | pthread_mutex_unlock(&ua_sess->lock); |
3806 | ||
840cb59c | 3807 | health_code_update(); |
86acf0da | 3808 | |
421cb601 | 3809 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3810 | ret = ustctl_wait_quiescent(app->sock); |
3811 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3812 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3813 | app->pid, ret); | |
3814 | } | |
48842b30 | 3815 | |
e0c7ec2b DG |
3816 | end: |
3817 | rcu_read_unlock(); | |
840cb59c | 3818 | health_code_update(); |
421cb601 | 3819 | return 0; |
48842b30 | 3820 | |
d0b96690 DG |
3821 | error_unlock: |
3822 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3823 | rcu_read_unlock(); |
840cb59c | 3824 | health_code_update(); |
421cb601 DG |
3825 | return -1; |
3826 | } | |
48842b30 | 3827 | |
8be98f9a MD |
3828 | /* |
3829 | * Stop tracing for a specific UST session and app. | |
3830 | */ | |
b34cbebf | 3831 | static |
8be98f9a MD |
3832 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3833 | { | |
3834 | int ret = 0; | |
3835 | struct ust_app_session *ua_sess; | |
7972aab2 | 3836 | struct ust_registry_session *registry; |
8be98f9a | 3837 | |
852d0037 | 3838 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3839 | |
3840 | rcu_read_lock(); | |
3841 | ||
e0c7ec2b | 3842 | if (!app->compatible) { |
d88aee68 | 3843 | goto end_no_session; |
e0c7ec2b DG |
3844 | } |
3845 | ||
8be98f9a MD |
3846 | ua_sess = lookup_session_by_app(usess, app); |
3847 | if (ua_sess == NULL) { | |
d88aee68 | 3848 | goto end_no_session; |
8be98f9a MD |
3849 | } |
3850 | ||
d88aee68 DG |
3851 | pthread_mutex_lock(&ua_sess->lock); |
3852 | ||
9bc07046 DG |
3853 | /* |
3854 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3855 | * that was never started. It's possible since we can have a fail start |
3856 | * from either the application manager thread or the command thread. Simply | |
3857 | * indicate that this is a stop error. | |
9bc07046 | 3858 | */ |
f9dfc3d9 | 3859 | if (!ua_sess->started) { |
c45536e1 DG |
3860 | goto error_rcu_unlock; |
3861 | } | |
7db205b5 | 3862 | |
840cb59c | 3863 | health_code_update(); |
86acf0da | 3864 | |
9d6c7d3f | 3865 | /* This inhibits UST tracing */ |
852d0037 | 3866 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3867 | if (ret < 0) { |
ffe60014 DG |
3868 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3869 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3870 | app->pid, ret); | |
3871 | } else { | |
3872 | DBG("UST app stop session failed. Application is dead."); | |
47cb9d4a DG |
3873 | /* |
3874 | * This is normal behavior, an application can die during the | |
3875 | * creation process. Don't report an error so the execution can | |
3876 | * continue normally. | |
3877 | */ | |
3878 | goto end_unlock; | |
ffe60014 | 3879 | } |
9d6c7d3f DG |
3880 | goto error_rcu_unlock; |
3881 | } | |
3882 | ||
840cb59c | 3883 | health_code_update(); |
86acf0da | 3884 | |
9d6c7d3f | 3885 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3886 | ret = ustctl_wait_quiescent(app->sock); |
3887 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3888 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3889 | app->pid, ret); | |
3890 | } | |
9d6c7d3f | 3891 | |
840cb59c | 3892 | health_code_update(); |
86acf0da | 3893 | |
b34cbebf MD |
3894 | registry = get_session_registry(ua_sess); |
3895 | assert(registry); | |
1b532a60 DG |
3896 | |
3897 | if (!registry->metadata_closed) { | |
3898 | /* Push metadata for application before freeing the application. */ | |
3899 | (void) push_metadata(registry, ua_sess->consumer); | |
3900 | } | |
b34cbebf | 3901 | |
47cb9d4a | 3902 | end_unlock: |
b34cbebf MD |
3903 | pthread_mutex_unlock(&ua_sess->lock); |
3904 | end_no_session: | |
3905 | rcu_read_unlock(); | |
3906 | health_code_update(); | |
3907 | return 0; | |
3908 | ||
3909 | error_rcu_unlock: | |
3910 | pthread_mutex_unlock(&ua_sess->lock); | |
3911 | rcu_read_unlock(); | |
3912 | health_code_update(); | |
3913 | return -1; | |
3914 | } | |
3915 | ||
3916 | /* | |
3917 | * Flush buffers for a specific UST session and app. | |
3918 | */ | |
3919 | static | |
3920 | int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
3921 | { | |
3922 | int ret = 0; | |
3923 | struct lttng_ht_iter iter; | |
3924 | struct ust_app_session *ua_sess; | |
3925 | struct ust_app_channel *ua_chan; | |
3926 | ||
3927 | DBG("Flushing buffers for ust app pid %d", app->pid); | |
3928 | ||
3929 | rcu_read_lock(); | |
3930 | ||
3931 | if (!app->compatible) { | |
3932 | goto end_no_session; | |
3933 | } | |
3934 | ||
3935 | ua_sess = lookup_session_by_app(usess, app); | |
3936 | if (ua_sess == NULL) { | |
3937 | goto end_no_session; | |
3938 | } | |
3939 | ||
3940 | pthread_mutex_lock(&ua_sess->lock); | |
3941 | ||
3942 | health_code_update(); | |
3943 | ||
9d6c7d3f | 3944 | /* Flushing buffers */ |
bec39940 DG |
3945 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
3946 | node.node) { | |
840cb59c | 3947 | health_code_update(); |
ffe60014 | 3948 | assert(ua_chan->is_sent); |
852d0037 | 3949 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 3950 | if (ret < 0) { |
ffe60014 DG |
3951 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3952 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
3953 | app->pid, ua_chan->name, ret); | |
3954 | } else { | |
3955 | DBG3("UST app failed to flush %s. Application is dead.", | |
3956 | ua_chan->name); | |
47cb9d4a DG |
3957 | /* |
3958 | * This is normal behavior, an application can die during the | |
3959 | * creation process. Don't report an error so the execution can | |
3960 | * continue normally. | |
3961 | */ | |
ffe60014 | 3962 | } |
6d3686da DG |
3963 | /* Continuing flushing all buffers */ |
3964 | continue; | |
8be98f9a MD |
3965 | } |
3966 | } | |
8be98f9a | 3967 | |
840cb59c | 3968 | health_code_update(); |
86acf0da | 3969 | |
d88aee68 DG |
3970 | pthread_mutex_unlock(&ua_sess->lock); |
3971 | end_no_session: | |
7db205b5 | 3972 | rcu_read_unlock(); |
840cb59c | 3973 | health_code_update(); |
8be98f9a | 3974 | return 0; |
8be98f9a MD |
3975 | } |
3976 | ||
84cd17c6 MD |
3977 | /* |
3978 | * Destroy a specific UST session in apps. | |
3979 | */ | |
3353de95 | 3980 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 3981 | { |
ffe60014 | 3982 | int ret; |
84cd17c6 | 3983 | struct ust_app_session *ua_sess; |
bec39940 | 3984 | struct lttng_ht_iter iter; |
77c5447b | 3985 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 3986 | |
852d0037 | 3987 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
3988 | |
3989 | rcu_read_lock(); | |
3990 | ||
e0c7ec2b DG |
3991 | if (!app->compatible) { |
3992 | goto end; | |
3993 | } | |
3994 | ||
84cd17c6 | 3995 | __lookup_session_by_app(usess, app, &iter); |
77c5447b | 3996 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 3997 | if (node == NULL) { |
d42f20df DG |
3998 | /* Session is being or is deleted. */ |
3999 | goto end; | |
84cd17c6 MD |
4000 | } |
4001 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4002 | |
840cb59c | 4003 | health_code_update(); |
d0b96690 | 4004 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4005 | |
840cb59c | 4006 | health_code_update(); |
7db205b5 | 4007 | |
84cd17c6 | 4008 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4009 | ret = ustctl_wait_quiescent(app->sock); |
4010 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4011 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4012 | app->pid, ret); | |
4013 | } | |
e0c7ec2b DG |
4014 | end: |
4015 | rcu_read_unlock(); | |
840cb59c | 4016 | health_code_update(); |
84cd17c6 | 4017 | return 0; |
84cd17c6 MD |
4018 | } |
4019 | ||
5b4a0ec0 DG |
4020 | /* |
4021 | * Start tracing for the UST session. | |
4022 | */ | |
421cb601 DG |
4023 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4024 | { | |
4025 | int ret = 0; | |
bec39940 | 4026 | struct lttng_ht_iter iter; |
421cb601 | 4027 | struct ust_app *app; |
48842b30 | 4028 | |
421cb601 DG |
4029 | DBG("Starting all UST traces"); |
4030 | ||
4031 | rcu_read_lock(); | |
421cb601 | 4032 | |
852d0037 | 4033 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4034 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4035 | if (ret < 0) { |
5b4a0ec0 DG |
4036 | /* Continue to next apps even on error */ |
4037 | continue; | |
48842b30 | 4038 | } |
48842b30 | 4039 | } |
5b4a0ec0 | 4040 | |
48842b30 DG |
4041 | rcu_read_unlock(); |
4042 | ||
4043 | return 0; | |
4044 | } | |
487cf67c | 4045 | |
8be98f9a MD |
4046 | /* |
4047 | * Start tracing for the UST session. | |
4048 | */ | |
4049 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4050 | { | |
4051 | int ret = 0; | |
bec39940 | 4052 | struct lttng_ht_iter iter; |
8be98f9a MD |
4053 | struct ust_app *app; |
4054 | ||
4055 | DBG("Stopping all UST traces"); | |
4056 | ||
4057 | rcu_read_lock(); | |
4058 | ||
b34cbebf MD |
4059 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4060 | ret = ust_app_stop_trace(usess, app); | |
4061 | if (ret < 0) { | |
4062 | /* Continue to next apps even on error */ | |
4063 | continue; | |
4064 | } | |
4065 | } | |
4066 | ||
5e674ece | 4067 | /* Flush buffers and push metadata (for UID buffers). */ |
b34cbebf MD |
4068 | switch (usess->buffer_type) { |
4069 | case LTTNG_BUFFER_PER_UID: | |
4070 | { | |
7972aab2 | 4071 | struct buffer_reg_uid *reg; |
b34cbebf MD |
4072 | |
4073 | /* Flush all per UID buffers associated to that session. */ | |
7972aab2 | 4074 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5e674ece | 4075 | struct ust_registry_session *ust_session_reg; |
7972aab2 DG |
4076 | struct buffer_reg_channel *reg_chan; |
4077 | struct consumer_socket *socket; | |
4078 | ||
4079 | /* Get consumer socket to use to push the metadata.*/ | |
4080 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4081 | usess->consumer); | |
4082 | if (!socket) { | |
4083 | /* Ignore request if no consumer is found for the session. */ | |
4084 | continue; | |
4085 | } | |
4086 | ||
4087 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4088 | reg_chan, node.node) { | |
4089 | /* | |
4090 | * The following call will print error values so the return | |
4091 | * code is of little importance because whatever happens, we | |
4092 | * have to try them all. | |
4093 | */ | |
4094 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4095 | } | |
5e674ece MD |
4096 | |
4097 | ust_session_reg = reg->registry->reg.ust; | |
4098 | if (!ust_session_reg->metadata_closed) { | |
4099 | /* Push metadata. */ | |
4100 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4101 | } | |
7972aab2 | 4102 | } |
5e674ece | 4103 | |
b34cbebf | 4104 | break; |
7972aab2 | 4105 | } |
b34cbebf MD |
4106 | case LTTNG_BUFFER_PER_PID: |
4107 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4108 | ret = ust_app_flush_trace(usess, app); | |
4109 | if (ret < 0) { | |
4110 | /* Continue to next apps even on error */ | |
4111 | continue; | |
4112 | } | |
8be98f9a | 4113 | } |
b34cbebf MD |
4114 | break; |
4115 | default: | |
4116 | assert(0); | |
4117 | break; | |
8be98f9a MD |
4118 | } |
4119 | ||
4120 | rcu_read_unlock(); | |
4121 | ||
4122 | return 0; | |
4123 | } | |
4124 | ||
84cd17c6 MD |
4125 | /* |
4126 | * Destroy app UST session. | |
4127 | */ | |
4128 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4129 | { | |
4130 | int ret = 0; | |
bec39940 | 4131 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4132 | struct ust_app *app; |
4133 | ||
4134 | DBG("Destroy all UST traces"); | |
4135 | ||
4136 | rcu_read_lock(); | |
4137 | ||
852d0037 | 4138 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4139 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4140 | if (ret < 0) { |
4141 | /* Continue to next apps even on error */ | |
4142 | continue; | |
4143 | } | |
4144 | } | |
4145 | ||
4146 | rcu_read_unlock(); | |
4147 | ||
4148 | return 0; | |
4149 | } | |
4150 | ||
5b4a0ec0 DG |
4151 | /* |
4152 | * Add channels/events from UST global domain to registered apps at sock. | |
4153 | */ | |
487cf67c DG |
4154 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4155 | { | |
55c54cce | 4156 | int ret = 0; |
4623416f | 4157 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4158 | struct ust_app *app; |
3d8ca23b | 4159 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4160 | struct ust_app_channel *ua_chan; |
4161 | struct ust_app_event *ua_event; | |
727d5404 | 4162 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4163 | |
95e047ff | 4164 | assert(usess); |
ffe60014 | 4165 | assert(sock >= 0); |
1f3580c7 | 4166 | |
77c5447b | 4167 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4168 | usess->id); |
487cf67c | 4169 | |
284d8f55 DG |
4170 | rcu_read_lock(); |
4171 | ||
487cf67c DG |
4172 | app = find_app_by_sock(sock); |
4173 | if (app == NULL) { | |
d88aee68 DG |
4174 | /* |
4175 | * Application can be unregistered before so this is possible hence | |
4176 | * simply stopping the update. | |
4177 | */ | |
4178 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4179 | goto error; |
4180 | } | |
4181 | ||
e0c7ec2b DG |
4182 | if (!app->compatible) { |
4183 | goto error; | |
4184 | } | |
4185 | ||
3d8ca23b DG |
4186 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4187 | if (ret < 0) { | |
4188 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4189 | goto error; |
4190 | } | |
3d8ca23b | 4191 | assert(ua_sess); |
487cf67c | 4192 | |
d0b96690 DG |
4193 | pthread_mutex_lock(&ua_sess->lock); |
4194 | ||
284d8f55 | 4195 | /* |
d0b96690 | 4196 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4197 | * app session above made a shadow copy of the UST global domain from the |
4198 | * ltt ust session. | |
4199 | */ | |
bec39940 DG |
4200 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4201 | node.node) { | |
d65d2de8 DG |
4202 | /* |
4203 | * For a metadata channel, handle it differently. | |
4204 | */ | |
4205 | if (!strncmp(ua_chan->name, DEFAULT_METADATA_NAME, | |
4206 | sizeof(ua_chan->name))) { | |
4207 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
4208 | &ua_chan->attr); | |
c7a339aa DG |
4209 | if (ret < 0) { |
4210 | goto error_unlock; | |
4211 | } | |
d65d2de8 DG |
4212 | /* Remove it from the hash table and continue!. */ |
4213 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
4214 | assert(!ret); | |
4215 | delete_ust_app_channel(-1, ua_chan, app); | |
4216 | continue; | |
4217 | } else { | |
4218 | ret = do_create_channel(app, usess, ua_sess, ua_chan); | |
c7a339aa DG |
4219 | if (ret < 0) { |
4220 | /* | |
4221 | * Stop everything. On error, the application failed, no more | |
4222 | * file descriptor are available or ENOMEM so stopping here is | |
4223 | * the only thing we can do for now. | |
4224 | */ | |
4225 | goto error_unlock; | |
4226 | } | |
487cf67c DG |
4227 | } |
4228 | ||
4623416f DG |
4229 | /* |
4230 | * Add context using the list so they are enabled in the same order the | |
4231 | * user added them. | |
4232 | */ | |
4233 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4234 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4235 | if (ret < 0) { | |
d0b96690 | 4236 | goto error_unlock; |
727d5404 DG |
4237 | } |
4238 | } | |
4239 | ||
4240 | ||
284d8f55 | 4241 | /* For each events */ |
bec39940 DG |
4242 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4243 | node.node) { | |
284d8f55 DG |
4244 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4245 | if (ret < 0) { | |
d0b96690 | 4246 | goto error_unlock; |
487cf67c | 4247 | } |
36dc12cc | 4248 | } |
487cf67c DG |
4249 | } |
4250 | ||
d0b96690 DG |
4251 | pthread_mutex_unlock(&ua_sess->lock); |
4252 | ||
36dc12cc | 4253 | if (usess->start_trace) { |
421cb601 | 4254 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4255 | if (ret < 0) { |
36dc12cc DG |
4256 | goto error; |
4257 | } | |
4258 | ||
852d0037 | 4259 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4260 | } |
4261 | ||
ffe60014 DG |
4262 | /* Everything went well at this point. */ |
4263 | rcu_read_unlock(); | |
4264 | return; | |
4265 | ||
d0b96690 DG |
4266 | error_unlock: |
4267 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4268 | error: |
ffe60014 | 4269 | if (ua_sess) { |
d0b96690 | 4270 | destroy_app_session(app, ua_sess); |
ffe60014 | 4271 | } |
487cf67c DG |
4272 | rcu_read_unlock(); |
4273 | return; | |
4274 | } | |
55cc08a6 DG |
4275 | |
4276 | /* | |
4277 | * Add context to a specific channel for global UST domain. | |
4278 | */ | |
4279 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4280 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4281 | { | |
4282 | int ret = 0; | |
bec39940 DG |
4283 | struct lttng_ht_node_str *ua_chan_node; |
4284 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4285 | struct ust_app_channel *ua_chan = NULL; |
4286 | struct ust_app_session *ua_sess; | |
4287 | struct ust_app *app; | |
4288 | ||
4289 | rcu_read_lock(); | |
4290 | ||
852d0037 | 4291 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4292 | if (!app->compatible) { |
4293 | /* | |
4294 | * TODO: In time, we should notice the caller of this error by | |
4295 | * telling him that this is a version error. | |
4296 | */ | |
4297 | continue; | |
4298 | } | |
55cc08a6 DG |
4299 | ua_sess = lookup_session_by_app(usess, app); |
4300 | if (ua_sess == NULL) { | |
4301 | continue; | |
4302 | } | |
4303 | ||
d0b96690 | 4304 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4305 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4306 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4307 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4308 | if (ua_chan_node == NULL) { |
d0b96690 | 4309 | goto next_app; |
55cc08a6 DG |
4310 | } |
4311 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4312 | node); | |
55cc08a6 DG |
4313 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4314 | if (ret < 0) { | |
d0b96690 | 4315 | goto next_app; |
55cc08a6 | 4316 | } |
d0b96690 DG |
4317 | next_app: |
4318 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4319 | } |
4320 | ||
55cc08a6 DG |
4321 | rcu_read_unlock(); |
4322 | return ret; | |
4323 | } | |
4324 | ||
76d45b40 DG |
4325 | /* |
4326 | * Enable event for a channel from a UST session for a specific PID. | |
4327 | */ | |
4328 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4329 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4330 | { | |
4331 | int ret = 0; | |
bec39940 | 4332 | struct lttng_ht_iter iter; |
18eace3b | 4333 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4334 | struct ust_app *app; |
4335 | struct ust_app_session *ua_sess; | |
4336 | struct ust_app_channel *ua_chan; | |
4337 | struct ust_app_event *ua_event; | |
4338 | ||
4339 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4340 | ||
4341 | rcu_read_lock(); | |
4342 | ||
4343 | app = ust_app_find_by_pid(pid); | |
4344 | if (app == NULL) { | |
4345 | ERR("UST app enable event per PID %d not found", pid); | |
4346 | ret = -1; | |
d0b96690 | 4347 | goto end; |
76d45b40 DG |
4348 | } |
4349 | ||
e0c7ec2b DG |
4350 | if (!app->compatible) { |
4351 | ret = 0; | |
d0b96690 | 4352 | goto end; |
e0c7ec2b DG |
4353 | } |
4354 | ||
76d45b40 | 4355 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4356 | if (!ua_sess) { |
4357 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4358 | ret = 0; |
4359 | goto end; | |
c4a1715b | 4360 | } |
76d45b40 | 4361 | |
d0b96690 | 4362 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4363 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4364 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4365 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4366 | /* If the channel is not found, there is a code flow error */ |
4367 | assert(ua_chan_node); | |
4368 | ||
4369 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4370 | ||
18eace3b DG |
4371 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4372 | uevent->filter, uevent->attr.loglevel); | |
4373 | if (ua_event == NULL) { | |
76d45b40 DG |
4374 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4375 | if (ret < 0) { | |
d0b96690 | 4376 | goto end_unlock; |
76d45b40 DG |
4377 | } |
4378 | } else { | |
76d45b40 DG |
4379 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4380 | if (ret < 0) { | |
d0b96690 | 4381 | goto end_unlock; |
76d45b40 DG |
4382 | } |
4383 | } | |
4384 | ||
d0b96690 DG |
4385 | end_unlock: |
4386 | pthread_mutex_unlock(&ua_sess->lock); | |
4387 | end: | |
76d45b40 DG |
4388 | rcu_read_unlock(); |
4389 | return ret; | |
4390 | } | |
7f79d3a1 DG |
4391 | |
4392 | /* | |
4393 | * Disable event for a channel from a UST session for a specific PID. | |
4394 | */ | |
4395 | int ust_app_disable_event_pid(struct ltt_ust_session *usess, | |
4396 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4397 | { | |
4398 | int ret = 0; | |
bec39940 DG |
4399 | struct lttng_ht_iter iter; |
4400 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
7f79d3a1 DG |
4401 | struct ust_app *app; |
4402 | struct ust_app_session *ua_sess; | |
4403 | struct ust_app_channel *ua_chan; | |
4404 | struct ust_app_event *ua_event; | |
4405 | ||
4406 | DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); | |
4407 | ||
4408 | rcu_read_lock(); | |
4409 | ||
4410 | app = ust_app_find_by_pid(pid); | |
4411 | if (app == NULL) { | |
4412 | ERR("UST app disable event per PID %d not found", pid); | |
4413 | ret = -1; | |
4414 | goto error; | |
4415 | } | |
4416 | ||
e0c7ec2b DG |
4417 | if (!app->compatible) { |
4418 | ret = 0; | |
4419 | goto error; | |
4420 | } | |
4421 | ||
7f79d3a1 | 4422 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4423 | if (!ua_sess) { |
4424 | /* The application has problem or is probably dead. */ | |
4425 | goto error; | |
4426 | } | |
7f79d3a1 DG |
4427 | |
4428 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4429 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4430 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4431 | if (ua_chan_node == NULL) { |
4432 | /* Channel does not exist, skip disabling */ | |
4433 | goto error; | |
4434 | } | |
4435 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4436 | ||
bec39940 DG |
4437 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); |
4438 | ua_event_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4439 | if (ua_event_node == NULL) { |
4440 | /* Event does not exist, skip disabling */ | |
4441 | goto error; | |
4442 | } | |
4443 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
4444 | ||
4445 | ret = disable_ust_app_event(ua_sess, ua_event, app); | |
4446 | if (ret < 0) { | |
4447 | goto error; | |
4448 | } | |
4449 | ||
4450 | error: | |
4451 | rcu_read_unlock(); | |
4452 | return ret; | |
4453 | } | |
e0c7ec2b | 4454 | |
4466912f DG |
4455 | /* |
4456 | * Calibrate registered applications. | |
4457 | */ | |
4458 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4459 | { | |
4460 | int ret = 0; | |
4461 | struct lttng_ht_iter iter; | |
4462 | struct ust_app *app; | |
4463 | ||
4464 | rcu_read_lock(); | |
4465 | ||
852d0037 | 4466 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4467 | if (!app->compatible) { |
4468 | /* | |
4469 | * TODO: In time, we should notice the caller of this error by | |
4470 | * telling him that this is a version error. | |
4471 | */ | |
4472 | continue; | |
4473 | } | |
4474 | ||
840cb59c | 4475 | health_code_update(); |
86acf0da | 4476 | |
852d0037 | 4477 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4478 | if (ret < 0) { |
4479 | switch (ret) { | |
4480 | case -ENOSYS: | |
4481 | /* Means that it's not implemented on the tracer side. */ | |
4482 | ret = 0; | |
4483 | break; | |
4484 | default: | |
4466912f | 4485 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4486 | app->pid, ret); |
4466912f DG |
4487 | break; |
4488 | } | |
4489 | } | |
4490 | } | |
4491 | ||
4492 | DBG("UST app global domain calibration finished"); | |
4493 | ||
4494 | rcu_read_unlock(); | |
4495 | ||
840cb59c | 4496 | health_code_update(); |
86acf0da | 4497 | |
4466912f DG |
4498 | return ret; |
4499 | } | |
d0b96690 DG |
4500 | |
4501 | /* | |
4502 | * Receive registration and populate the given msg structure. | |
4503 | * | |
4504 | * On success return 0 else a negative value returned by the ustctl call. | |
4505 | */ | |
4506 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4507 | { | |
4508 | int ret; | |
4509 | uint32_t pid, ppid, uid, gid; | |
4510 | ||
4511 | assert(msg); | |
4512 | ||
4513 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4514 | &pid, &ppid, &uid, &gid, | |
4515 | &msg->bits_per_long, | |
4516 | &msg->uint8_t_alignment, | |
4517 | &msg->uint16_t_alignment, | |
4518 | &msg->uint32_t_alignment, | |
4519 | &msg->uint64_t_alignment, | |
4520 | &msg->long_alignment, | |
4521 | &msg->byte_order, | |
4522 | msg->name); | |
4523 | if (ret < 0) { | |
4524 | switch (-ret) { | |
4525 | case EPIPE: | |
4526 | case ECONNRESET: | |
4527 | case LTTNG_UST_ERR_EXITING: | |
4528 | DBG3("UST app recv reg message failed. Application died"); | |
4529 | break; | |
4530 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4531 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4532 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4533 | LTTNG_UST_ABI_MINOR_VERSION); | |
4534 | break; | |
4535 | default: | |
4536 | ERR("UST app recv reg message failed with ret %d", ret); | |
4537 | break; | |
4538 | } | |
4539 | goto error; | |
4540 | } | |
4541 | msg->pid = (pid_t) pid; | |
4542 | msg->ppid = (pid_t) ppid; | |
4543 | msg->uid = (uid_t) uid; | |
4544 | msg->gid = (gid_t) gid; | |
4545 | ||
4546 | error: | |
4547 | return ret; | |
4548 | } | |
4549 | ||
d88aee68 DG |
4550 | /* |
4551 | * Return a ust app channel object using the application object and the channel | |
4552 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4553 | * lock MUST be acquired before calling this function. | |
4554 | */ | |
d0b96690 DG |
4555 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4556 | int objd) | |
4557 | { | |
4558 | struct lttng_ht_node_ulong *node; | |
4559 | struct lttng_ht_iter iter; | |
4560 | struct ust_app_channel *ua_chan = NULL; | |
4561 | ||
4562 | assert(app); | |
4563 | ||
4564 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4565 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4566 | if (node == NULL) { | |
4567 | DBG2("UST app channel find by objd %d not found", objd); | |
4568 | goto error; | |
4569 | } | |
4570 | ||
4571 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4572 | ||
4573 | error: | |
4574 | return ua_chan; | |
4575 | } | |
4576 | ||
d88aee68 DG |
4577 | /* |
4578 | * Reply to a register channel notification from an application on the notify | |
4579 | * socket. The channel metadata is also created. | |
4580 | * | |
4581 | * The session UST registry lock is acquired in this function. | |
4582 | * | |
4583 | * On success 0 is returned else a negative value. | |
4584 | */ | |
d0b96690 DG |
4585 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4586 | size_t nr_fields, struct ustctl_field *fields) | |
4587 | { | |
4588 | int ret, ret_code = 0; | |
4589 | uint32_t chan_id, reg_count; | |
7972aab2 | 4590 | uint64_t chan_reg_key; |
d0b96690 DG |
4591 | enum ustctl_channel_header type; |
4592 | struct ust_app *app; | |
4593 | struct ust_app_channel *ua_chan; | |
4594 | struct ust_app_session *ua_sess; | |
7972aab2 | 4595 | struct ust_registry_session *registry; |
45893984 | 4596 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4597 | |
4598 | rcu_read_lock(); | |
4599 | ||
4600 | /* Lookup application. If not found, there is a code flow error. */ | |
4601 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4602 | if (!app) { |
4603 | DBG("Application socket %d is being teardown. Abort event notify", | |
4604 | sock); | |
4605 | ret = 0; | |
d5d629b5 | 4606 | free(fields); |
d88aee68 DG |
4607 | goto error_rcu_unlock; |
4608 | } | |
d0b96690 | 4609 | |
4950b860 | 4610 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4611 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4612 | if (!ua_chan) { |
4613 | DBG("Application channel is being teardown. Abort event notify"); | |
4614 | ret = 0; | |
d5d629b5 | 4615 | free(fields); |
4950b860 MD |
4616 | goto error_rcu_unlock; |
4617 | } | |
4618 | ||
d0b96690 DG |
4619 | assert(ua_chan->session); |
4620 | ua_sess = ua_chan->session; | |
d0b96690 | 4621 | |
7972aab2 DG |
4622 | /* Get right session registry depending on the session buffer type. */ |
4623 | registry = get_session_registry(ua_sess); | |
4624 | assert(registry); | |
45893984 | 4625 | |
7972aab2 DG |
4626 | /* Depending on the buffer type, a different channel key is used. */ |
4627 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4628 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4629 | } else { |
7972aab2 | 4630 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4631 | } |
4632 | ||
7972aab2 DG |
4633 | pthread_mutex_lock(®istry->lock); |
4634 | ||
4635 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4636 | assert(chan_reg); | |
4637 | ||
4638 | if (!chan_reg->register_done) { | |
4639 | reg_count = ust_registry_get_event_count(chan_reg); | |
4640 | if (reg_count < 31) { | |
4641 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4642 | } else { | |
4643 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4644 | } | |
4645 | ||
4646 | chan_reg->nr_ctx_fields = nr_fields; | |
4647 | chan_reg->ctx_fields = fields; | |
4648 | chan_reg->header_type = type; | |
d0b96690 | 4649 | } else { |
7972aab2 DG |
4650 | /* Get current already assigned values. */ |
4651 | type = chan_reg->header_type; | |
d5d629b5 DG |
4652 | free(fields); |
4653 | /* Set to NULL so the error path does not do a double free. */ | |
4654 | fields = NULL; | |
d0b96690 | 4655 | } |
7972aab2 DG |
4656 | /* Channel id is set during the object creation. */ |
4657 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4658 | |
4659 | /* Append to metadata */ | |
7972aab2 DG |
4660 | if (!chan_reg->metadata_dumped) { |
4661 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4662 | if (ret_code) { |
4663 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4664 | goto reply; | |
4665 | } | |
4666 | } | |
4667 | ||
4668 | reply: | |
7972aab2 DG |
4669 | DBG3("UST app replying to register channel key %" PRIu64 |
4670 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4671 | ret_code); | |
d0b96690 DG |
4672 | |
4673 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4674 | if (ret < 0) { | |
4675 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4676 | ERR("UST app reply channel failed with ret %d", ret); | |
4677 | } else { | |
4678 | DBG3("UST app reply channel failed. Application died"); | |
4679 | } | |
4680 | goto error; | |
4681 | } | |
4682 | ||
7972aab2 DG |
4683 | /* This channel registry registration is completed. */ |
4684 | chan_reg->register_done = 1; | |
4685 | ||
d0b96690 | 4686 | error: |
7972aab2 | 4687 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4688 | error_rcu_unlock: |
d0b96690 | 4689 | rcu_read_unlock(); |
d5d629b5 DG |
4690 | if (ret) { |
4691 | free(fields); | |
4692 | } | |
d0b96690 DG |
4693 | return ret; |
4694 | } | |
4695 | ||
d88aee68 DG |
4696 | /* |
4697 | * Add event to the UST channel registry. When the event is added to the | |
4698 | * registry, the metadata is also created. Once done, this replies to the | |
4699 | * application with the appropriate error code. | |
4700 | * | |
4701 | * The session UST registry lock is acquired in the function. | |
4702 | * | |
4703 | * On success 0 is returned else a negative value. | |
4704 | */ | |
d0b96690 DG |
4705 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4706 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4707 | char *model_emf_uri) | |
4708 | { | |
4709 | int ret, ret_code; | |
4710 | uint32_t event_id = 0; | |
7972aab2 | 4711 | uint64_t chan_reg_key; |
d0b96690 DG |
4712 | struct ust_app *app; |
4713 | struct ust_app_channel *ua_chan; | |
4714 | struct ust_app_session *ua_sess; | |
7972aab2 | 4715 | struct ust_registry_session *registry; |
d0b96690 DG |
4716 | |
4717 | rcu_read_lock(); | |
4718 | ||
4719 | /* Lookup application. If not found, there is a code flow error. */ | |
4720 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4721 | if (!app) { |
4722 | DBG("Application socket %d is being teardown. Abort event notify", | |
4723 | sock); | |
4724 | ret = 0; | |
d5d629b5 DG |
4725 | free(sig); |
4726 | free(fields); | |
4727 | free(model_emf_uri); | |
d88aee68 DG |
4728 | goto error_rcu_unlock; |
4729 | } | |
d0b96690 | 4730 | |
4950b860 | 4731 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4732 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4733 | if (!ua_chan) { |
4734 | DBG("Application channel is being teardown. Abort event notify"); | |
4735 | ret = 0; | |
d5d629b5 DG |
4736 | free(sig); |
4737 | free(fields); | |
4738 | free(model_emf_uri); | |
4950b860 MD |
4739 | goto error_rcu_unlock; |
4740 | } | |
4741 | ||
d0b96690 DG |
4742 | assert(ua_chan->session); |
4743 | ua_sess = ua_chan->session; | |
4744 | ||
7972aab2 DG |
4745 | registry = get_session_registry(ua_sess); |
4746 | assert(registry); | |
4747 | ||
4748 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4749 | chan_reg_key = ua_chan->tracing_channel_id; | |
4750 | } else { | |
4751 | chan_reg_key = ua_chan->key; | |
4752 | } | |
4753 | ||
4754 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4755 | |
d5d629b5 DG |
4756 | /* |
4757 | * From this point on, this call acquires the ownership of the sig, fields | |
4758 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4759 | * three variables MUST NOT be read/write after this. | |
4760 | */ | |
7972aab2 | 4761 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4762 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
9664f59b MD |
4763 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4764 | app); | |
d0b96690 DG |
4765 | |
4766 | /* | |
4767 | * The return value is returned to ustctl so in case of an error, the | |
4768 | * application can be notified. In case of an error, it's important not to | |
4769 | * return a negative error or else the application will get closed. | |
4770 | */ | |
4771 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4772 | if (ret < 0) { | |
4773 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4774 | ERR("UST app reply event failed with ret %d", ret); | |
4775 | } else { | |
4776 | DBG3("UST app reply event failed. Application died"); | |
4777 | } | |
4778 | /* | |
4779 | * No need to wipe the create event since the application socket will | |
4780 | * get close on error hence cleaning up everything by itself. | |
4781 | */ | |
4782 | goto error; | |
4783 | } | |
4784 | ||
7972aab2 DG |
4785 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4786 | name, event_id); | |
d88aee68 | 4787 | |
d0b96690 | 4788 | error: |
7972aab2 | 4789 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4790 | error_rcu_unlock: |
d0b96690 DG |
4791 | rcu_read_unlock(); |
4792 | return ret; | |
4793 | } | |
4794 | ||
d88aee68 DG |
4795 | /* |
4796 | * Handle application notification through the given notify socket. | |
4797 | * | |
4798 | * Return 0 on success or else a negative value. | |
4799 | */ | |
d0b96690 DG |
4800 | int ust_app_recv_notify(int sock) |
4801 | { | |
4802 | int ret; | |
4803 | enum ustctl_notify_cmd cmd; | |
4804 | ||
4805 | DBG3("UST app receiving notify from sock %d", sock); | |
4806 | ||
4807 | ret = ustctl_recv_notify(sock, &cmd); | |
4808 | if (ret < 0) { | |
4809 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4810 | ERR("UST app recv notify failed with ret %d", ret); | |
4811 | } else { | |
4812 | DBG3("UST app recv notify failed. Application died"); | |
4813 | } | |
4814 | goto error; | |
4815 | } | |
4816 | ||
4817 | switch (cmd) { | |
4818 | case USTCTL_NOTIFY_CMD_EVENT: | |
4819 | { | |
4820 | int sobjd, cobjd, loglevel; | |
4821 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4822 | size_t nr_fields; | |
4823 | struct ustctl_field *fields; | |
4824 | ||
4825 | DBG2("UST app ustctl register event received"); | |
4826 | ||
4827 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4828 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4829 | if (ret < 0) { | |
4830 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4831 | ERR("UST app recv event failed with ret %d", ret); | |
4832 | } else { | |
4833 | DBG3("UST app recv event failed. Application died"); | |
4834 | } | |
4835 | goto error; | |
4836 | } | |
4837 | ||
d5d629b5 DG |
4838 | /* |
4839 | * Add event to the UST registry coming from the notify socket. This | |
4840 | * call will free if needed the sig, fields and model_emf_uri. This | |
4841 | * code path loses the ownsership of these variables and transfer them | |
4842 | * to the this function. | |
4843 | */ | |
d0b96690 DG |
4844 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4845 | fields, loglevel, model_emf_uri); | |
4846 | if (ret < 0) { | |
4847 | goto error; | |
4848 | } | |
4849 | ||
4850 | break; | |
4851 | } | |
4852 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4853 | { | |
4854 | int sobjd, cobjd; | |
4855 | size_t nr_fields; | |
4856 | struct ustctl_field *fields; | |
4857 | ||
4858 | DBG2("UST app ustctl register channel received"); | |
4859 | ||
4860 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4861 | &fields); | |
4862 | if (ret < 0) { | |
4863 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4864 | ERR("UST app recv channel failed with ret %d", ret); | |
4865 | } else { | |
4866 | DBG3("UST app recv channel failed. Application died"); | |
4867 | } | |
4868 | goto error; | |
4869 | } | |
4870 | ||
d5d629b5 DG |
4871 | /* |
4872 | * The fields ownership are transfered to this function call meaning | |
4873 | * that if needed it will be freed. After this, it's invalid to access | |
4874 | * fields or clean it up. | |
4875 | */ | |
d0b96690 DG |
4876 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4877 | fields); | |
4878 | if (ret < 0) { | |
4879 | goto error; | |
4880 | } | |
4881 | ||
4882 | break; | |
4883 | } | |
4884 | default: | |
4885 | /* Should NEVER happen. */ | |
4886 | assert(0); | |
4887 | } | |
4888 | ||
4889 | error: | |
4890 | return ret; | |
4891 | } | |
d88aee68 DG |
4892 | |
4893 | /* | |
4894 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4895 | * corresponding application. On failure, the call_rcu to close the socket is | |
4896 | * executed. If an application is found, it tries to delete it from the notify | |
4897 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4898 | * | |
4899 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4900 | * call RCU is not done but the rest of the cleanup is. | |
4901 | */ | |
4902 | void ust_app_notify_sock_unregister(int sock) | |
4903 | { | |
4904 | int err_enomem = 0; | |
4905 | struct lttng_ht_iter iter; | |
4906 | struct ust_app *app; | |
4907 | struct ust_app_notify_sock_obj *obj; | |
4908 | ||
4909 | assert(sock >= 0); | |
4910 | ||
4911 | rcu_read_lock(); | |
4912 | ||
4913 | obj = zmalloc(sizeof(*obj)); | |
4914 | if (!obj) { | |
4915 | /* | |
4916 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4917 | * procedure but the call_rcu will not be called. In this case, we | |
4918 | * accept the fd leak rather than possibly creating an unsynchronized | |
4919 | * state between threads. | |
4920 | * | |
4921 | * TODO: The notify object should be created once the notify socket is | |
4922 | * registered and stored independantely from the ust app object. The | |
4923 | * tricky part is to synchronize the teardown of the application and | |
4924 | * this notify object. Let's keep that in mind so we can avoid this | |
4925 | * kind of shenanigans with ENOMEM in the teardown path. | |
4926 | */ | |
4927 | err_enomem = 1; | |
4928 | } else { | |
4929 | obj->fd = sock; | |
4930 | } | |
4931 | ||
4932 | DBG("UST app notify socket unregister %d", sock); | |
4933 | ||
4934 | /* | |
4935 | * Lookup application by notify socket. If this fails, this means that the | |
4936 | * hash table delete has already been done by the application | |
4937 | * unregistration process so we can safely close the notify socket in a | |
4938 | * call RCU. | |
4939 | */ | |
4940 | app = find_app_by_notify_sock(sock); | |
4941 | if (!app) { | |
4942 | goto close_socket; | |
4943 | } | |
4944 | ||
4945 | iter.iter.node = &app->notify_sock_n.node; | |
4946 | ||
4947 | /* | |
4948 | * Whatever happens here either we fail or succeed, in both cases we have | |
4949 | * to close the socket after a grace period to continue to the call RCU | |
4950 | * here. If the deletion is successful, the application is not visible | |
4951 | * anymore by other threads and is it fails it means that it was already | |
4952 | * deleted from the hash table so either way we just have to close the | |
4953 | * socket. | |
4954 | */ | |
4955 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4956 | ||
4957 | close_socket: | |
4958 | rcu_read_unlock(); | |
4959 | ||
4960 | /* | |
4961 | * Close socket after a grace period to avoid for the socket to be reused | |
4962 | * before the application object is freed creating potential race between | |
4963 | * threads trying to add unique in the global hash table. | |
4964 | */ | |
4965 | if (!err_enomem) { | |
4966 | call_rcu(&obj->head, close_notify_sock_rcu); | |
4967 | } | |
4968 | } | |
f45e313d DG |
4969 | |
4970 | /* | |
4971 | * Destroy a ust app data structure and free its memory. | |
4972 | */ | |
4973 | void ust_app_destroy(struct ust_app *app) | |
4974 | { | |
4975 | if (!app) { | |
4976 | return; | |
4977 | } | |
4978 | ||
4979 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
4980 | } |