Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
91d76f53 DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
16 | */ |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <errno.h> | |
7972aab2 | 20 | #include <inttypes.h> |
91d76f53 DG |
21 | #include <pthread.h> |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
099e26bd | 24 | #include <string.h> |
aba8e916 DG |
25 | #include <sys/stat.h> |
26 | #include <sys/types.h> | |
099e26bd | 27 | #include <unistd.h> |
0df502fd | 28 | #include <urcu/compiler.h> |
fb54cdbf | 29 | #include <lttng/ust-error.h> |
331744e3 | 30 | #include <signal.h> |
bec39940 | 31 | |
990570ed | 32 | #include <common/common.h> |
86acf0da | 33 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 34 | |
7972aab2 | 35 | #include "buffer-registry.h" |
86acf0da 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 | } | |
331744e3 JD |
481 | ret_val = ret; |
482 | goto error_push; | |
483 | } | |
484 | ||
485 | free(metadata_str); | |
486 | return len; | |
487 | ||
488 | end: | |
489 | error: | |
490 | pthread_mutex_unlock(®istry->lock); | |
491 | error_push: | |
492 | free(metadata_str); | |
493 | return ret_val; | |
494 | } | |
495 | ||
d88aee68 DG |
496 | /* |
497 | * For a given application and session, push metadata to consumer. The session | |
498 | * lock MUST be acquired here before calling this. | |
331744e3 JD |
499 | * Either sock or consumer is required : if sock is NULL, the default |
500 | * socket to send the metadata is retrieved from consumer, if sock | |
501 | * is not NULL we use it to send the metadata. | |
d88aee68 DG |
502 | * |
503 | * Return 0 on success else a negative error. | |
504 | */ | |
7972aab2 DG |
505 | static int push_metadata(struct ust_registry_session *registry, |
506 | struct consumer_output *consumer) | |
d88aee68 | 507 | { |
331744e3 JD |
508 | int ret_val; |
509 | ssize_t ret; | |
d88aee68 DG |
510 | struct consumer_socket *socket; |
511 | ||
7972aab2 DG |
512 | assert(registry); |
513 | assert(consumer); | |
514 | ||
515 | rcu_read_lock(); | |
d88aee68 | 516 | |
7972aab2 DG |
517 | /* |
518 | * Means that no metadata was assigned to the session. This can happens if | |
519 | * no start has been done previously. | |
520 | */ | |
521 | if (!registry->metadata_key) { | |
331744e3 | 522 | ret_val = 0; |
1b532a60 | 523 | goto end_rcu_unlock; |
d88aee68 DG |
524 | } |
525 | ||
d88aee68 | 526 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
527 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
528 | consumer); | |
d88aee68 | 529 | if (!socket) { |
331744e3 | 530 | ret_val = -1; |
d88aee68 DG |
531 | goto error_rcu_unlock; |
532 | } | |
533 | ||
534 | /* | |
535 | * TODO: Currently, we hold the socket lock around sampling of the next | |
536 | * metadata segment to ensure we send metadata over the consumer socket in | |
537 | * the correct order. This makes the registry lock nest inside the socket | |
538 | * lock. | |
539 | * | |
540 | * Please note that this is a temporary measure: we should move this lock | |
541 | * back into ust_consumer_push_metadata() when the consumer gets the | |
542 | * ability to reorder the metadata it receives. | |
543 | */ | |
544 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
545 | ret = ust_app_push_metadata(registry, socket, 0); |
546 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 547 | if (ret < 0) { |
331744e3 | 548 | ret_val = ret; |
d88aee68 DG |
549 | goto error_rcu_unlock; |
550 | } | |
551 | ||
d88aee68 | 552 | rcu_read_unlock(); |
d88aee68 DG |
553 | return 0; |
554 | ||
d88aee68 | 555 | error_rcu_unlock: |
1b532a60 DG |
556 | /* |
557 | * On error, flag the registry that the metadata is closed. We were unable | |
558 | * to push anything and this means that either the consumer is not | |
559 | * responding or the metadata cache has been destroyed on the consumer. | |
560 | */ | |
561 | registry->metadata_closed = 1; | |
562 | end_rcu_unlock: | |
d88aee68 | 563 | rcu_read_unlock(); |
331744e3 | 564 | return ret_val; |
d88aee68 DG |
565 | } |
566 | ||
567 | /* | |
568 | * Send to the consumer a close metadata command for the given session. Once | |
569 | * done, the metadata channel is deleted and the session metadata pointer is | |
570 | * nullified. The session lock MUST be acquired here unless the application is | |
571 | * in the destroy path. | |
572 | * | |
573 | * Return 0 on success else a negative value. | |
574 | */ | |
7972aab2 DG |
575 | static int close_metadata(struct ust_registry_session *registry, |
576 | struct consumer_output *consumer) | |
d88aee68 DG |
577 | { |
578 | int ret; | |
579 | struct consumer_socket *socket; | |
580 | ||
7972aab2 DG |
581 | assert(registry); |
582 | assert(consumer); | |
d88aee68 | 583 | |
7972aab2 DG |
584 | rcu_read_lock(); |
585 | ||
586 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 | 587 | ret = 0; |
1b532a60 | 588 | goto end; |
d88aee68 DG |
589 | } |
590 | ||
d88aee68 | 591 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
592 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
593 | consumer); | |
d88aee68 DG |
594 | if (!socket) { |
595 | ret = -1; | |
7972aab2 | 596 | goto error; |
d88aee68 DG |
597 | } |
598 | ||
7972aab2 | 599 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 600 | if (ret < 0) { |
7972aab2 | 601 | goto error; |
d88aee68 DG |
602 | } |
603 | ||
d88aee68 | 604 | error: |
1b532a60 DG |
605 | /* |
606 | * Metadata closed. Even on error this means that the consumer is not | |
607 | * responding or not found so either way a second close should NOT be emit | |
608 | * for this registry. | |
609 | */ | |
610 | registry->metadata_closed = 1; | |
611 | end: | |
7972aab2 | 612 | rcu_read_unlock(); |
d88aee68 DG |
613 | return ret; |
614 | } | |
615 | ||
36b588ed MD |
616 | /* |
617 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
618 | * section and outside of call_rcu thread, so we postpone its execution |
619 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
620 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
621 | */ |
622 | static | |
623 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
624 | { | |
625 | struct ust_app_session *ua_sess = | |
626 | caa_container_of(head, struct ust_app_session, rcu_head); | |
627 | ||
0b2dc8df | 628 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
629 | free(ua_sess); |
630 | } | |
631 | ||
d80a6244 DG |
632 | /* |
633 | * Delete ust app session safely. RCU read lock must be held before calling | |
634 | * this function. | |
635 | */ | |
8b366481 | 636 | static |
d0b96690 DG |
637 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
638 | struct ust_app *app) | |
d80a6244 DG |
639 | { |
640 | int ret; | |
bec39940 | 641 | struct lttng_ht_iter iter; |
d80a6244 | 642 | struct ust_app_channel *ua_chan; |
7972aab2 | 643 | struct ust_registry_session *registry; |
d80a6244 | 644 | |
d88aee68 DG |
645 | assert(ua_sess); |
646 | ||
1b532a60 DG |
647 | pthread_mutex_lock(&ua_sess->lock); |
648 | ||
7972aab2 | 649 | registry = get_session_registry(ua_sess); |
1b532a60 | 650 | if (registry && !registry->metadata_closed) { |
d88aee68 | 651 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 652 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 653 | |
7972aab2 DG |
654 | /* |
655 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
656 | * metadata only on destroy trace session in this case. Also, the |
657 | * previous push metadata could have flag the metadata registry to | |
658 | * close so don't send a close command if closed. | |
7972aab2 | 659 | */ |
1b532a60 DG |
660 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
661 | !registry->metadata_closed) { | |
7972aab2 DG |
662 | /* And ask to close it for this session registry. */ |
663 | (void) close_metadata(registry, ua_sess->consumer); | |
664 | } | |
d80a6244 DG |
665 | } |
666 | ||
bec39940 DG |
667 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
668 | node.node) { | |
669 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 670 | assert(!ret); |
d0b96690 | 671 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 672 | } |
d80a6244 | 673 | |
7972aab2 DG |
674 | /* In case of per PID, the registry is kept in the session. */ |
675 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
676 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
677 | if (reg_pid) { | |
678 | buffer_reg_pid_remove(reg_pid); | |
679 | buffer_reg_pid_destroy(reg_pid); | |
680 | } | |
681 | } | |
d0b96690 | 682 | |
aee6bafd | 683 | if (ua_sess->handle != -1) { |
ffe60014 DG |
684 | ret = ustctl_release_handle(sock, ua_sess->handle); |
685 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
686 | ERR("UST app sock %d release session handle failed with ret %d", | |
687 | sock, ret); | |
688 | } | |
aee6bafd | 689 | } |
1b532a60 DG |
690 | pthread_mutex_unlock(&ua_sess->lock); |
691 | ||
36b588ed | 692 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 693 | } |
91d76f53 DG |
694 | |
695 | /* | |
284d8f55 DG |
696 | * Delete a traceable application structure from the global list. Never call |
697 | * this function outside of a call_rcu call. | |
36b588ed MD |
698 | * |
699 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 700 | */ |
8b366481 DG |
701 | static |
702 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 703 | { |
8b366481 | 704 | int ret, sock; |
d42f20df | 705 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 706 | |
d80a6244 | 707 | /* Delete ust app sessions info */ |
852d0037 DG |
708 | sock = app->sock; |
709 | app->sock = -1; | |
d80a6244 | 710 | |
8b366481 | 711 | /* Wipe sessions */ |
d42f20df DG |
712 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
713 | teardown_node) { | |
714 | /* Free every object in the session and the session. */ | |
36b588ed | 715 | rcu_read_lock(); |
d0b96690 | 716 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 717 | rcu_read_unlock(); |
d80a6244 | 718 | } |
36b588ed | 719 | |
0b2dc8df MD |
720 | ht_cleanup_push(app->sessions); |
721 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 722 | |
6414a713 | 723 | /* |
852d0037 DG |
724 | * Wait until we have deleted the application from the sock hash table |
725 | * before closing this socket, otherwise an application could re-use the | |
726 | * socket ID and race with the teardown, using the same hash table entry. | |
727 | * | |
728 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
729 | * all RCU readers that could run concurrently with unregister app, | |
730 | * therefore we _need_ to only close that socket after a grace period. So | |
731 | * it should stay in this RCU callback. | |
732 | * | |
733 | * This close() is a very important step of the synchronization model so | |
734 | * every modification to this function must be carefully reviewed. | |
6414a713 | 735 | */ |
799e2c4f MD |
736 | ret = close(sock); |
737 | if (ret) { | |
738 | PERROR("close"); | |
739 | } | |
4063050c | 740 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 741 | |
852d0037 | 742 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 743 | free(app); |
099e26bd DG |
744 | } |
745 | ||
746 | /* | |
f6a9efaa | 747 | * URCU intermediate call to delete an UST app. |
099e26bd | 748 | */ |
8b366481 DG |
749 | static |
750 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 751 | { |
bec39940 DG |
752 | struct lttng_ht_node_ulong *node = |
753 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 754 | struct ust_app *app = |
852d0037 | 755 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 756 | |
852d0037 | 757 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 758 | delete_ust_app(app); |
099e26bd DG |
759 | } |
760 | ||
ffe60014 DG |
761 | /* |
762 | * Delete the session from the application ht and delete the data structure by | |
763 | * freeing every object inside and releasing them. | |
764 | */ | |
d0b96690 | 765 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
766 | struct ust_app_session *ua_sess) |
767 | { | |
768 | int ret; | |
769 | struct lttng_ht_iter iter; | |
770 | ||
771 | assert(app); | |
772 | assert(ua_sess); | |
773 | ||
774 | iter.iter.node = &ua_sess->node.node; | |
775 | ret = lttng_ht_del(app->sessions, &iter); | |
776 | if (ret) { | |
777 | /* Already scheduled for teardown. */ | |
778 | goto end; | |
779 | } | |
780 | ||
781 | /* Once deleted, free the data structure. */ | |
d0b96690 | 782 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
783 | |
784 | end: | |
785 | return; | |
786 | } | |
787 | ||
8b366481 DG |
788 | /* |
789 | * Alloc new UST app session. | |
790 | */ | |
791 | static | |
d0b96690 | 792 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
793 | { |
794 | struct ust_app_session *ua_sess; | |
795 | ||
796 | /* Init most of the default value by allocating and zeroing */ | |
797 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
798 | if (ua_sess == NULL) { | |
799 | PERROR("malloc"); | |
ffe60014 | 800 | goto error_free; |
8b366481 DG |
801 | } |
802 | ||
803 | ua_sess->handle = -1; | |
bec39940 | 804 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
d0b96690 | 805 | pthread_mutex_init(&ua_sess->lock, NULL); |
ffe60014 | 806 | |
8b366481 DG |
807 | return ua_sess; |
808 | ||
ffe60014 | 809 | error_free: |
8b366481 DG |
810 | return NULL; |
811 | } | |
812 | ||
813 | /* | |
814 | * Alloc new UST app channel. | |
815 | */ | |
816 | static | |
817 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 818 | struct ust_app_session *ua_sess, |
ffe60014 | 819 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
820 | { |
821 | struct ust_app_channel *ua_chan; | |
822 | ||
823 | /* Init most of the default value by allocating and zeroing */ | |
824 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
825 | if (ua_chan == NULL) { | |
826 | PERROR("malloc"); | |
827 | goto error; | |
828 | } | |
829 | ||
830 | /* Setup channel name */ | |
831 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
832 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
833 | ||
834 | ua_chan->enabled = 1; | |
835 | ua_chan->handle = -1; | |
45893984 | 836 | ua_chan->session = ua_sess; |
ffe60014 | 837 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
838 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
839 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
840 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
841 | |
842 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
4623416f | 843 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
844 | |
845 | /* Copy attributes */ | |
846 | if (attr) { | |
ffe60014 | 847 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
848 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
849 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
850 | ua_chan->attr.overwrite = attr->overwrite; | |
851 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
852 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
853 | ua_chan->attr.output = attr->output; | |
8b366481 | 854 | } |
ffe60014 DG |
855 | /* By default, the channel is a per cpu channel. */ |
856 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
857 | |
858 | DBG3("UST app channel %s allocated", ua_chan->name); | |
859 | ||
860 | return ua_chan; | |
861 | ||
862 | error: | |
863 | return NULL; | |
864 | } | |
865 | ||
37f1c236 DG |
866 | /* |
867 | * Allocate and initialize a UST app stream. | |
868 | * | |
869 | * Return newly allocated stream pointer or NULL on error. | |
870 | */ | |
ffe60014 | 871 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
872 | { |
873 | struct ust_app_stream *stream = NULL; | |
874 | ||
875 | stream = zmalloc(sizeof(*stream)); | |
876 | if (stream == NULL) { | |
877 | PERROR("zmalloc ust app stream"); | |
878 | goto error; | |
879 | } | |
880 | ||
881 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
882 | stream->handle = -1; | |
883 | ||
884 | error: | |
885 | return stream; | |
886 | } | |
887 | ||
8b366481 DG |
888 | /* |
889 | * Alloc new UST app event. | |
890 | */ | |
891 | static | |
892 | struct ust_app_event *alloc_ust_app_event(char *name, | |
893 | struct lttng_ust_event *attr) | |
894 | { | |
895 | struct ust_app_event *ua_event; | |
896 | ||
897 | /* Init most of the default value by allocating and zeroing */ | |
898 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
899 | if (ua_event == NULL) { | |
900 | PERROR("malloc"); | |
901 | goto error; | |
902 | } | |
903 | ||
904 | ua_event->enabled = 1; | |
905 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
906 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 907 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
908 | |
909 | /* Copy attributes */ | |
910 | if (attr) { | |
911 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
912 | } | |
913 | ||
914 | DBG3("UST app event %s allocated", ua_event->name); | |
915 | ||
916 | return ua_event; | |
917 | ||
918 | error: | |
919 | return NULL; | |
920 | } | |
921 | ||
922 | /* | |
923 | * Alloc new UST app context. | |
924 | */ | |
925 | static | |
926 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
927 | { | |
928 | struct ust_app_ctx *ua_ctx; | |
929 | ||
930 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
931 | if (ua_ctx == NULL) { | |
932 | goto error; | |
933 | } | |
934 | ||
4623416f DG |
935 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
936 | ||
8b366481 DG |
937 | if (uctx) { |
938 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
939 | } | |
940 | ||
941 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
942 | ||
943 | error: | |
944 | return ua_ctx; | |
945 | } | |
946 | ||
025faf73 DG |
947 | /* |
948 | * Allocate a filter and copy the given original filter. | |
949 | * | |
950 | * Return allocated filter or NULL on error. | |
951 | */ | |
952 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
953 | struct lttng_ust_filter_bytecode *orig_f) | |
954 | { | |
955 | struct lttng_ust_filter_bytecode *filter = NULL; | |
956 | ||
957 | /* Copy filter bytecode */ | |
958 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
959 | if (!filter) { | |
960 | PERROR("zmalloc alloc ust app filter"); | |
961 | goto error; | |
962 | } | |
963 | ||
964 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
965 | ||
966 | error: | |
967 | return filter; | |
968 | } | |
969 | ||
099e26bd | 970 | /* |
421cb601 DG |
971 | * Find an ust_app using the sock and return it. RCU read side lock must be |
972 | * held before calling this helper function. | |
099e26bd | 973 | */ |
8b366481 DG |
974 | static |
975 | struct ust_app *find_app_by_sock(int sock) | |
099e26bd | 976 | { |
bec39940 | 977 | struct lttng_ht_node_ulong *node; |
bec39940 | 978 | struct lttng_ht_iter iter; |
f6a9efaa | 979 | |
852d0037 | 980 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 981 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
982 | if (node == NULL) { |
983 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
984 | goto error; |
985 | } | |
852d0037 DG |
986 | |
987 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
988 | |
989 | error: | |
990 | return NULL; | |
099e26bd DG |
991 | } |
992 | ||
d0b96690 DG |
993 | /* |
994 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
995 | * be held before calling this helper function. | |
996 | */ | |
997 | static struct ust_app *find_app_by_notify_sock(int sock) | |
998 | { | |
999 | struct lttng_ht_node_ulong *node; | |
1000 | struct lttng_ht_iter iter; | |
1001 | ||
1002 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1003 | &iter); | |
1004 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1005 | if (node == NULL) { | |
1006 | DBG2("UST app find by notify sock %d not found", sock); | |
1007 | goto error; | |
1008 | } | |
1009 | ||
1010 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1011 | ||
1012 | error: | |
1013 | return NULL; | |
1014 | } | |
1015 | ||
025faf73 DG |
1016 | /* |
1017 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1018 | * event loglevel. | |
1019 | * | |
1020 | * Return an ust_app_event object or NULL on error. | |
1021 | */ | |
18eace3b DG |
1022 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
1023 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel) | |
1024 | { | |
1025 | struct lttng_ht_iter iter; | |
1026 | struct lttng_ht_node_str *node; | |
1027 | struct ust_app_event *event = NULL; | |
1028 | struct ust_app_ht_key key; | |
18eace3b DG |
1029 | |
1030 | assert(name); | |
1031 | assert(ht); | |
1032 | ||
1033 | /* Setup key for event lookup. */ | |
1034 | key.name = name; | |
1035 | key.filter = filter; | |
1036 | key.loglevel = loglevel; | |
1037 | ||
025faf73 DG |
1038 | /* Lookup using the event name as hash and a custom match fct. */ |
1039 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1040 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1041 | node = lttng_ht_iter_get_node_str(&iter); |
1042 | if (node == NULL) { | |
1043 | goto end; | |
1044 | } | |
1045 | ||
1046 | event = caa_container_of(node, struct ust_app_event, node); | |
1047 | ||
1048 | end: | |
18eace3b DG |
1049 | return event; |
1050 | } | |
1051 | ||
55cc08a6 DG |
1052 | /* |
1053 | * Create the channel context on the tracer. | |
d0b96690 DG |
1054 | * |
1055 | * Called with UST app session lock held. | |
55cc08a6 DG |
1056 | */ |
1057 | static | |
1058 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1059 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1060 | { | |
1061 | int ret; | |
1062 | ||
840cb59c | 1063 | health_code_update(); |
86acf0da | 1064 | |
852d0037 | 1065 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1066 | ua_chan->obj, &ua_ctx->obj); |
1067 | if (ret < 0) { | |
ffe60014 DG |
1068 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1069 | ERR("UST app create channel context failed for app (pid: %d) " | |
1070 | "with ret %d", app->pid, ret); | |
1071 | } else { | |
47cb9d4a DG |
1072 | /* |
1073 | * This is normal behavior, an application can die during the | |
1074 | * creation process. Don't report an error so the execution can | |
1075 | * continue normally. | |
1076 | */ | |
1077 | ret = 0; | |
ffe60014 DG |
1078 | DBG3("UST app disable event failed. Application is dead."); |
1079 | } | |
55cc08a6 DG |
1080 | goto error; |
1081 | } | |
1082 | ||
1083 | ua_ctx->handle = ua_ctx->obj->handle; | |
1084 | ||
d0b96690 DG |
1085 | DBG2("UST app context handle %d created successfully for channel %s", |
1086 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1087 | |
1088 | error: | |
840cb59c | 1089 | health_code_update(); |
55cc08a6 DG |
1090 | return ret; |
1091 | } | |
1092 | ||
53a80697 MD |
1093 | /* |
1094 | * Set the filter on the tracer. | |
1095 | */ | |
1096 | static | |
1097 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1098 | struct ust_app *app) | |
1099 | { | |
1100 | int ret; | |
1101 | ||
840cb59c | 1102 | health_code_update(); |
86acf0da | 1103 | |
53a80697 | 1104 | if (!ua_event->filter) { |
86acf0da DG |
1105 | ret = 0; |
1106 | goto error; | |
53a80697 MD |
1107 | } |
1108 | ||
1109 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1110 | ua_event->obj); | |
1111 | if (ret < 0) { | |
ffe60014 DG |
1112 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1113 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1114 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1115 | } else { | |
47cb9d4a DG |
1116 | /* |
1117 | * This is normal behavior, an application can die during the | |
1118 | * creation process. Don't report an error so the execution can | |
1119 | * continue normally. | |
1120 | */ | |
1121 | ret = 0; | |
ffe60014 DG |
1122 | DBG3("UST app filter event failed. Application is dead."); |
1123 | } | |
53a80697 MD |
1124 | goto error; |
1125 | } | |
1126 | ||
1127 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1128 | ||
1129 | error: | |
840cb59c | 1130 | health_code_update(); |
53a80697 MD |
1131 | return ret; |
1132 | } | |
1133 | ||
9730260e DG |
1134 | /* |
1135 | * Disable the specified event on to UST tracer for the UST session. | |
1136 | */ | |
1137 | static int disable_ust_event(struct ust_app *app, | |
1138 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1139 | { | |
1140 | int ret; | |
1141 | ||
840cb59c | 1142 | health_code_update(); |
86acf0da | 1143 | |
852d0037 | 1144 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1145 | if (ret < 0) { |
ffe60014 DG |
1146 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1147 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1148 | "and session handle %d with ret %d", | |
1149 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1150 | } else { | |
47cb9d4a DG |
1151 | /* |
1152 | * This is normal behavior, an application can die during the | |
1153 | * creation process. Don't report an error so the execution can | |
1154 | * continue normally. | |
1155 | */ | |
1156 | ret = 0; | |
ffe60014 DG |
1157 | DBG3("UST app disable event failed. Application is dead."); |
1158 | } | |
9730260e DG |
1159 | goto error; |
1160 | } | |
1161 | ||
1162 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1163 | ua_event->attr.name, app->pid); |
9730260e DG |
1164 | |
1165 | error: | |
840cb59c | 1166 | health_code_update(); |
9730260e DG |
1167 | return ret; |
1168 | } | |
1169 | ||
78f0bacd DG |
1170 | /* |
1171 | * Disable the specified channel on to UST tracer for the UST session. | |
1172 | */ | |
1173 | static int disable_ust_channel(struct ust_app *app, | |
1174 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1175 | { | |
1176 | int ret; | |
1177 | ||
840cb59c | 1178 | health_code_update(); |
86acf0da | 1179 | |
852d0037 | 1180 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1181 | if (ret < 0) { |
ffe60014 DG |
1182 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1183 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1184 | "and session handle %d with ret %d", | |
1185 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1186 | } else { | |
47cb9d4a DG |
1187 | /* |
1188 | * This is normal behavior, an application can die during the | |
1189 | * creation process. Don't report an error so the execution can | |
1190 | * continue normally. | |
1191 | */ | |
1192 | ret = 0; | |
ffe60014 DG |
1193 | DBG3("UST app disable channel failed. Application is dead."); |
1194 | } | |
78f0bacd DG |
1195 | goto error; |
1196 | } | |
1197 | ||
78f0bacd | 1198 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1199 | ua_chan->name, app->pid); |
78f0bacd DG |
1200 | |
1201 | error: | |
840cb59c | 1202 | health_code_update(); |
78f0bacd DG |
1203 | return ret; |
1204 | } | |
1205 | ||
1206 | /* | |
1207 | * Enable the specified channel on to UST tracer for the UST session. | |
1208 | */ | |
1209 | static int enable_ust_channel(struct ust_app *app, | |
1210 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1211 | { | |
1212 | int ret; | |
1213 | ||
840cb59c | 1214 | health_code_update(); |
86acf0da | 1215 | |
852d0037 | 1216 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1217 | if (ret < 0) { |
ffe60014 DG |
1218 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1219 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1220 | "and session handle %d with ret %d", | |
1221 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1222 | } else { | |
47cb9d4a DG |
1223 | /* |
1224 | * This is normal behavior, an application can die during the | |
1225 | * creation process. Don't report an error so the execution can | |
1226 | * continue normally. | |
1227 | */ | |
1228 | ret = 0; | |
ffe60014 DG |
1229 | DBG3("UST app enable channel failed. Application is dead."); |
1230 | } | |
78f0bacd DG |
1231 | goto error; |
1232 | } | |
1233 | ||
1234 | ua_chan->enabled = 1; | |
1235 | ||
1236 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1237 | ua_chan->name, app->pid); |
78f0bacd DG |
1238 | |
1239 | error: | |
840cb59c | 1240 | health_code_update(); |
78f0bacd DG |
1241 | return ret; |
1242 | } | |
1243 | ||
edb67388 DG |
1244 | /* |
1245 | * Enable the specified event on to UST tracer for the UST session. | |
1246 | */ | |
1247 | static int enable_ust_event(struct ust_app *app, | |
1248 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1249 | { | |
1250 | int ret; | |
1251 | ||
840cb59c | 1252 | health_code_update(); |
86acf0da | 1253 | |
852d0037 | 1254 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1255 | if (ret < 0) { |
ffe60014 DG |
1256 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1257 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1258 | "and session handle %d with ret %d", | |
1259 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1260 | } else { | |
47cb9d4a DG |
1261 | /* |
1262 | * This is normal behavior, an application can die during the | |
1263 | * creation process. Don't report an error so the execution can | |
1264 | * continue normally. | |
1265 | */ | |
1266 | ret = 0; | |
ffe60014 DG |
1267 | DBG3("UST app enable event failed. Application is dead."); |
1268 | } | |
edb67388 DG |
1269 | goto error; |
1270 | } | |
1271 | ||
1272 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1273 | ua_event->attr.name, app->pid); |
edb67388 DG |
1274 | |
1275 | error: | |
840cb59c | 1276 | health_code_update(); |
edb67388 DG |
1277 | return ret; |
1278 | } | |
1279 | ||
099e26bd | 1280 | /* |
7972aab2 | 1281 | * Send channel and stream buffer to application. |
4f3ab6ee | 1282 | * |
ffe60014 | 1283 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1284 | */ |
7972aab2 DG |
1285 | static int send_channel_pid_to_ust(struct ust_app *app, |
1286 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1287 | { |
1288 | int ret; | |
ffe60014 | 1289 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1290 | |
1291 | assert(app); | |
ffe60014 | 1292 | assert(ua_sess); |
4f3ab6ee | 1293 | assert(ua_chan); |
4f3ab6ee | 1294 | |
840cb59c | 1295 | health_code_update(); |
4f3ab6ee | 1296 | |
7972aab2 DG |
1297 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1298 | app->sock); | |
86acf0da | 1299 | |
ffe60014 DG |
1300 | /* Send channel to the application. */ |
1301 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1302 | if (ret < 0) { |
b551a063 DG |
1303 | goto error; |
1304 | } | |
1305 | ||
d88aee68 DG |
1306 | health_code_update(); |
1307 | ||
ffe60014 DG |
1308 | /* Send all streams to application. */ |
1309 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1310 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1311 | if (ret < 0) { | |
1312 | goto error; | |
1313 | } | |
1314 | /* We don't need the stream anymore once sent to the tracer. */ | |
1315 | cds_list_del(&stream->list); | |
1316 | delete_ust_app_stream(-1, stream); | |
1317 | } | |
ffe60014 DG |
1318 | /* Flag the channel that it is sent to the application. */ |
1319 | ua_chan->is_sent = 1; | |
ffe60014 | 1320 | |
b551a063 | 1321 | error: |
840cb59c | 1322 | health_code_update(); |
b551a063 DG |
1323 | return ret; |
1324 | } | |
1325 | ||
91d76f53 | 1326 | /* |
5b4a0ec0 | 1327 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1328 | * |
1329 | * Should be called with session mutex held. | |
91d76f53 | 1330 | */ |
edb67388 DG |
1331 | static |
1332 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1333 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1334 | { |
5b4a0ec0 | 1335 | int ret = 0; |
284d8f55 | 1336 | |
840cb59c | 1337 | health_code_update(); |
86acf0da | 1338 | |
5b4a0ec0 | 1339 | /* Create UST event on tracer */ |
852d0037 | 1340 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1341 | &ua_event->obj); |
1342 | if (ret < 0) { | |
ffe60014 DG |
1343 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1344 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1345 | ua_event->attr.name, app->pid, ret); | |
1346 | } else { | |
47cb9d4a DG |
1347 | /* |
1348 | * This is normal behavior, an application can die during the | |
1349 | * creation process. Don't report an error so the execution can | |
1350 | * continue normally. | |
1351 | */ | |
1352 | ret = 0; | |
ffe60014 DG |
1353 | DBG3("UST app create event failed. Application is dead."); |
1354 | } | |
5b4a0ec0 | 1355 | goto error; |
91d76f53 | 1356 | } |
f6a9efaa | 1357 | |
5b4a0ec0 | 1358 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1359 | |
5b4a0ec0 | 1360 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1361 | ua_event->attr.name, app->pid); |
f6a9efaa | 1362 | |
840cb59c | 1363 | health_code_update(); |
86acf0da | 1364 | |
025faf73 DG |
1365 | /* Set filter if one is present. */ |
1366 | if (ua_event->filter) { | |
1367 | ret = set_ust_event_filter(ua_event, app); | |
1368 | if (ret < 0) { | |
1369 | goto error; | |
1370 | } | |
1371 | } | |
1372 | ||
8535a6d9 | 1373 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 1374 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
1375 | ret = disable_ust_event(app, ua_sess, ua_event); |
1376 | if (ret < 0) { | |
fc34caaa DG |
1377 | /* |
1378 | * If we hit an EPERM, something is wrong with our disable call. If | |
1379 | * we get an EEXIST, there is a problem on the tracer side since we | |
1380 | * just created it. | |
1381 | */ | |
1382 | switch (ret) { | |
49c336c1 | 1383 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1384 | /* Code flow problem */ |
1385 | assert(0); | |
49c336c1 | 1386 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1387 | /* It's OK for our use case. */ |
1388 | ret = 0; | |
1389 | break; | |
1390 | default: | |
1391 | break; | |
1392 | } | |
8535a6d9 DG |
1393 | goto error; |
1394 | } | |
1395 | } | |
1396 | ||
5b4a0ec0 | 1397 | error: |
840cb59c | 1398 | health_code_update(); |
5b4a0ec0 | 1399 | return ret; |
91d76f53 | 1400 | } |
48842b30 | 1401 | |
5b4a0ec0 DG |
1402 | /* |
1403 | * Copy data between an UST app event and a LTT event. | |
1404 | */ | |
421cb601 | 1405 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1406 | struct ltt_ust_event *uevent) |
1407 | { | |
1408 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); | |
1409 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1410 | ||
fc34caaa DG |
1411 | ua_event->enabled = uevent->enabled; |
1412 | ||
5b4a0ec0 DG |
1413 | /* Copy event attributes */ |
1414 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1415 | ||
53a80697 MD |
1416 | /* Copy filter bytecode */ |
1417 | if (uevent->filter) { | |
025faf73 DG |
1418 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1419 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1420 | } |
48842b30 DG |
1421 | } |
1422 | ||
5b4a0ec0 DG |
1423 | /* |
1424 | * Copy data between an UST app channel and a LTT channel. | |
1425 | */ | |
421cb601 | 1426 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1427 | struct ltt_ust_channel *uchan) |
1428 | { | |
bec39940 | 1429 | struct lttng_ht_iter iter; |
48842b30 | 1430 | struct ltt_ust_event *uevent; |
55cc08a6 | 1431 | struct ltt_ust_context *uctx; |
48842b30 | 1432 | struct ust_app_event *ua_event; |
55cc08a6 | 1433 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1434 | |
fc34caaa | 1435 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1436 | |
1437 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1438 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1439 | |
1624d5b7 JD |
1440 | ua_chan->tracefile_size = uchan->tracefile_size; |
1441 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1442 | ||
ffe60014 DG |
1443 | /* Copy event attributes since the layout is different. */ |
1444 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1445 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1446 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1447 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1448 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1449 | ua_chan->attr.output = uchan->attr.output; | |
1450 | /* | |
1451 | * Note that the attribute channel type is not set since the channel on the | |
1452 | * tracing registry side does not have this information. | |
1453 | */ | |
48842b30 | 1454 | |
fc34caaa | 1455 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1456 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1457 | |
4623416f | 1458 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1459 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1460 | if (ua_ctx == NULL) { | |
1461 | continue; | |
1462 | } | |
bec39940 DG |
1463 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1464 | (unsigned long) ua_ctx->ctx.ctx); | |
1465 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
4623416f | 1466 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1467 | } |
48842b30 | 1468 | |
421cb601 | 1469 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1470 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b DG |
1471 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
1472 | uevent->filter, uevent->attr.loglevel); | |
1473 | if (ua_event == NULL) { | |
421cb601 | 1474 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1475 | uevent->attr.name); |
284d8f55 | 1476 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1477 | if (ua_event == NULL) { |
5b4a0ec0 | 1478 | continue; |
48842b30 | 1479 | } |
421cb601 | 1480 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1481 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1482 | } |
48842b30 DG |
1483 | } |
1484 | ||
fc34caaa | 1485 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1486 | } |
1487 | ||
5b4a0ec0 DG |
1488 | /* |
1489 | * Copy data between a UST app session and a regular LTT session. | |
1490 | */ | |
421cb601 | 1491 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1492 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1493 | { |
bec39940 DG |
1494 | struct lttng_ht_node_str *ua_chan_node; |
1495 | struct lttng_ht_iter iter; | |
48842b30 DG |
1496 | struct ltt_ust_channel *uchan; |
1497 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1498 | time_t rawtime; |
1499 | struct tm *timeinfo; | |
1500 | char datetime[16]; | |
1501 | int ret; | |
1502 | ||
1503 | /* Get date and time for unique app path */ | |
1504 | time(&rawtime); | |
1505 | timeinfo = localtime(&rawtime); | |
1506 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1507 | |
421cb601 | 1508 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1509 | |
7972aab2 DG |
1510 | ua_sess->tracing_id = usess->id; |
1511 | ua_sess->id = get_next_session_id(); | |
1512 | ua_sess->uid = app->uid; | |
1513 | ua_sess->gid = app->gid; | |
1514 | ua_sess->euid = usess->uid; | |
1515 | ua_sess->egid = usess->gid; | |
1516 | ua_sess->buffer_type = usess->buffer_type; | |
1517 | ua_sess->bits_per_long = app->bits_per_long; | |
1518 | /* There is only one consumer object per session possible. */ | |
1519 | ua_sess->consumer = usess->consumer; | |
1520 | ||
1521 | switch (ua_sess->buffer_type) { | |
1522 | case LTTNG_BUFFER_PER_PID: | |
1523 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1524 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1525 | datetime); |
1526 | break; | |
1527 | case LTTNG_BUFFER_PER_UID: | |
1528 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1529 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1530 | break; | |
1531 | default: | |
1532 | assert(0); | |
1533 | goto error; | |
1534 | } | |
477d7741 MD |
1535 | if (ret < 0) { |
1536 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1537 | assert(0); |
7972aab2 | 1538 | goto error; |
477d7741 MD |
1539 | } |
1540 | ||
48842b30 | 1541 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1542 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1543 | uchan, node.node) { | |
1544 | struct lttng_ht_iter uiter; | |
ba767faf | 1545 | |
bec39940 DG |
1546 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1547 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1548 | if (ua_chan_node != NULL) { |
fc34caaa | 1549 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1550 | continue; |
1551 | } | |
421cb601 | 1552 | |
5b4a0ec0 DG |
1553 | DBG2("Channel %s not found on shadow session copy, creating it", |
1554 | uchan->name); | |
d0b96690 | 1555 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1556 | if (ua_chan == NULL) { |
fc34caaa | 1557 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1558 | continue; |
48842b30 | 1559 | } |
5b4a0ec0 | 1560 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1561 | /* |
1562 | * The concept of metadata channel does not exist on the tracing | |
1563 | * registry side of the session daemon so this can only be a per CPU | |
1564 | * channel and not metadata. | |
1565 | */ | |
1566 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1567 | ||
bec39940 | 1568 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1569 | } |
7972aab2 DG |
1570 | |
1571 | error: | |
1572 | return; | |
48842b30 DG |
1573 | } |
1574 | ||
78f0bacd DG |
1575 | /* |
1576 | * Lookup sesison wrapper. | |
1577 | */ | |
84cd17c6 MD |
1578 | static |
1579 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1580 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1581 | { |
1582 | /* Get right UST app session from app */ | |
77c5447b | 1583 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1584 | } |
1585 | ||
421cb601 DG |
1586 | /* |
1587 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1588 | * id. |
421cb601 | 1589 | */ |
48842b30 DG |
1590 | static struct ust_app_session *lookup_session_by_app( |
1591 | struct ltt_ust_session *usess, struct ust_app *app) | |
1592 | { | |
bec39940 | 1593 | struct lttng_ht_iter iter; |
77c5447b | 1594 | struct lttng_ht_node_u64 *node; |
48842b30 | 1595 | |
84cd17c6 | 1596 | __lookup_session_by_app(usess, app, &iter); |
77c5447b | 1597 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1598 | if (node == NULL) { |
1599 | goto error; | |
1600 | } | |
1601 | ||
1602 | return caa_container_of(node, struct ust_app_session, node); | |
1603 | ||
1604 | error: | |
1605 | return NULL; | |
1606 | } | |
1607 | ||
7972aab2 DG |
1608 | /* |
1609 | * Setup buffer registry per PID for the given session and application. If none | |
1610 | * is found, a new one is created, added to the global registry and | |
1611 | * initialized. If regp is valid, it's set with the newly created object. | |
1612 | * | |
1613 | * Return 0 on success or else a negative value. | |
1614 | */ | |
1615 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1616 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1617 | { | |
1618 | int ret = 0; | |
1619 | struct buffer_reg_pid *reg_pid; | |
1620 | ||
1621 | assert(ua_sess); | |
1622 | assert(app); | |
1623 | ||
1624 | rcu_read_lock(); | |
1625 | ||
1626 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1627 | if (!reg_pid) { | |
1628 | /* | |
1629 | * This is the create channel path meaning that if there is NO | |
1630 | * registry available, we have to create one for this session. | |
1631 | */ | |
1632 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1633 | if (ret < 0) { | |
1634 | goto error; | |
1635 | } | |
1636 | buffer_reg_pid_add(reg_pid); | |
1637 | } else { | |
1638 | goto end; | |
1639 | } | |
1640 | ||
1641 | /* Initialize registry. */ | |
1642 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1643 | app->bits_per_long, app->uint8_t_alignment, | |
1644 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1645 | app->uint64_t_alignment, app->long_alignment, |
1646 | app->byte_order, app->version.major, | |
1647 | app->version.minor); | |
7972aab2 DG |
1648 | if (ret < 0) { |
1649 | goto error; | |
1650 | } | |
1651 | ||
1652 | DBG3("UST app buffer registry per PID created successfully"); | |
1653 | ||
1654 | end: | |
1655 | if (regp) { | |
1656 | *regp = reg_pid; | |
1657 | } | |
1658 | error: | |
1659 | rcu_read_unlock(); | |
1660 | return ret; | |
1661 | } | |
1662 | ||
1663 | /* | |
1664 | * Setup buffer registry per UID for the given session and application. If none | |
1665 | * is found, a new one is created, added to the global registry and | |
1666 | * initialized. If regp is valid, it's set with the newly created object. | |
1667 | * | |
1668 | * Return 0 on success or else a negative value. | |
1669 | */ | |
1670 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1671 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1672 | { | |
1673 | int ret = 0; | |
1674 | struct buffer_reg_uid *reg_uid; | |
1675 | ||
1676 | assert(usess); | |
1677 | assert(app); | |
1678 | ||
1679 | rcu_read_lock(); | |
1680 | ||
1681 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1682 | if (!reg_uid) { | |
1683 | /* | |
1684 | * This is the create channel path meaning that if there is NO | |
1685 | * registry available, we have to create one for this session. | |
1686 | */ | |
1687 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1688 | LTTNG_DOMAIN_UST, ®_uid); | |
1689 | if (ret < 0) { | |
1690 | goto error; | |
1691 | } | |
1692 | buffer_reg_uid_add(reg_uid); | |
1693 | } else { | |
1694 | goto end; | |
1695 | } | |
1696 | ||
1697 | /* Initialize registry. */ | |
af6142cf | 1698 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1699 | app->bits_per_long, app->uint8_t_alignment, |
1700 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1701 | app->uint64_t_alignment, app->long_alignment, |
1702 | app->byte_order, app->version.major, | |
1703 | app->version.minor); | |
7972aab2 DG |
1704 | if (ret < 0) { |
1705 | goto error; | |
1706 | } | |
1707 | /* Add node to teardown list of the session. */ | |
1708 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1709 | ||
1710 | DBG3("UST app buffer registry per UID created successfully"); | |
1711 | ||
1712 | end: | |
1713 | if (regp) { | |
1714 | *regp = reg_uid; | |
1715 | } | |
1716 | error: | |
1717 | rcu_read_unlock(); | |
1718 | return ret; | |
1719 | } | |
1720 | ||
421cb601 | 1721 | /* |
3d8ca23b | 1722 | * Create a session on the tracer side for the given app. |
421cb601 | 1723 | * |
3d8ca23b DG |
1724 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1725 | * untouched. If the session was created, is_created is set to 1. On error, | |
1726 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1727 | * be NULL. | |
1728 | * | |
1729 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1730 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1731 | */ |
3d8ca23b DG |
1732 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1733 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1734 | int *is_created) | |
421cb601 | 1735 | { |
3d8ca23b | 1736 | int ret, created = 0; |
421cb601 DG |
1737 | struct ust_app_session *ua_sess; |
1738 | ||
3d8ca23b DG |
1739 | assert(usess); |
1740 | assert(app); | |
1741 | assert(ua_sess_ptr); | |
1742 | ||
840cb59c | 1743 | health_code_update(); |
86acf0da | 1744 | |
421cb601 DG |
1745 | ua_sess = lookup_session_by_app(usess, app); |
1746 | if (ua_sess == NULL) { | |
77c5447b | 1747 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1748 | app->pid, usess->id); |
d0b96690 | 1749 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1750 | if (ua_sess == NULL) { |
1751 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1752 | ret = -ENOMEM; |
1753 | goto error; | |
421cb601 | 1754 | } |
477d7741 | 1755 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1756 | created = 1; |
421cb601 DG |
1757 | } |
1758 | ||
7972aab2 DG |
1759 | switch (usess->buffer_type) { |
1760 | case LTTNG_BUFFER_PER_PID: | |
1761 | /* Init local registry. */ | |
1762 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1763 | if (ret < 0) { |
7972aab2 DG |
1764 | goto error; |
1765 | } | |
1766 | break; | |
1767 | case LTTNG_BUFFER_PER_UID: | |
1768 | /* Look for a global registry. If none exists, create one. */ | |
1769 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1770 | if (ret < 0) { | |
1771 | goto error; | |
1772 | } | |
1773 | break; | |
1774 | default: | |
1775 | assert(0); | |
1776 | ret = -EINVAL; | |
1777 | goto error; | |
1778 | } | |
1779 | ||
1780 | health_code_update(); | |
1781 | ||
1782 | if (ua_sess->handle == -1) { | |
1783 | ret = ustctl_create_session(app->sock); | |
1784 | if (ret < 0) { | |
1785 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1786 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1787 | app->pid, ret); |
1788 | } else { | |
1789 | DBG("UST app creating session failed. Application is dead"); | |
47cb9d4a DG |
1790 | /* |
1791 | * This is normal behavior, an application can die during the | |
1792 | * creation process. Don't report an error so the execution can | |
1793 | * continue normally. This will get flagged ENOTCONN and the | |
1794 | * caller will handle it. | |
1795 | */ | |
1796 | ret = 0; | |
ffe60014 | 1797 | } |
d0b96690 | 1798 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1799 | if (ret != -ENOMEM) { |
1800 | /* | |
1801 | * Tracer is probably gone or got an internal error so let's | |
1802 | * behave like it will soon unregister or not usable. | |
1803 | */ | |
1804 | ret = -ENOTCONN; | |
1805 | } | |
1806 | goto error; | |
421cb601 DG |
1807 | } |
1808 | ||
7972aab2 DG |
1809 | ua_sess->handle = ret; |
1810 | ||
1811 | /* Add ust app session to app's HT */ | |
77c5447b MD |
1812 | lttng_ht_node_init_u64(&ua_sess->node, |
1813 | ua_sess->tracing_id); | |
1814 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1815 | |
1816 | DBG2("UST app session created successfully with handle %d", ret); | |
1817 | } | |
1818 | ||
1819 | *ua_sess_ptr = ua_sess; | |
1820 | if (is_created) { | |
1821 | *is_created = created; | |
1822 | } | |
1823 | ||
1824 | /* Everything went well. */ | |
1825 | ret = 0; | |
1826 | ||
1827 | error: | |
1828 | health_code_update(); | |
1829 | return ret; | |
1830 | } | |
1831 | ||
1832 | /* | |
1833 | * Create a context for the channel on the tracer. | |
1834 | * | |
1835 | * Called with UST app session lock held and a RCU read side lock. | |
1836 | */ | |
1837 | static | |
1838 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1839 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1840 | struct ust_app *app) | |
1841 | { | |
1842 | int ret = 0; | |
1843 | struct lttng_ht_iter iter; | |
1844 | struct lttng_ht_node_ulong *node; | |
1845 | struct ust_app_ctx *ua_ctx; | |
1846 | ||
1847 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1848 | ||
1849 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); | |
1850 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1851 | if (node != NULL) { | |
1852 | ret = -EEXIST; | |
1853 | goto error; | |
1854 | } | |
1855 | ||
1856 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1857 | if (ua_ctx == NULL) { | |
1858 | /* malloc failed */ | |
1859 | ret = -1; | |
1860 | goto error; | |
1861 | } | |
1862 | ||
1863 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
1864 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
4623416f | 1865 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
1866 | |
1867 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1868 | if (ret < 0) { | |
1869 | goto error; | |
1870 | } | |
1871 | ||
1872 | error: | |
1873 | return ret; | |
1874 | } | |
1875 | ||
1876 | /* | |
1877 | * Enable on the tracer side a ust app event for the session and channel. | |
1878 | * | |
1879 | * Called with UST app session lock held. | |
1880 | */ | |
1881 | static | |
1882 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
1883 | struct ust_app_event *ua_event, struct ust_app *app) | |
1884 | { | |
1885 | int ret; | |
1886 | ||
1887 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1888 | if (ret < 0) { | |
1889 | goto error; | |
1890 | } | |
1891 | ||
1892 | ua_event->enabled = 1; | |
1893 | ||
1894 | error: | |
1895 | return ret; | |
1896 | } | |
1897 | ||
1898 | /* | |
1899 | * Disable on the tracer side a ust app event for the session and channel. | |
1900 | */ | |
1901 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
1902 | struct ust_app_event *ua_event, struct ust_app *app) | |
1903 | { | |
1904 | int ret; | |
1905 | ||
1906 | ret = disable_ust_event(app, ua_sess, ua_event); | |
1907 | if (ret < 0) { | |
1908 | goto error; | |
1909 | } | |
1910 | ||
1911 | ua_event->enabled = 0; | |
1912 | ||
1913 | error: | |
1914 | return ret; | |
1915 | } | |
1916 | ||
1917 | /* | |
1918 | * Lookup ust app channel for session and disable it on the tracer side. | |
1919 | */ | |
1920 | static | |
1921 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
1922 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
1923 | { | |
1924 | int ret; | |
1925 | ||
1926 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
1927 | if (ret < 0) { | |
1928 | goto error; | |
1929 | } | |
1930 | ||
1931 | ua_chan->enabled = 0; | |
1932 | ||
1933 | error: | |
1934 | return ret; | |
1935 | } | |
1936 | ||
1937 | /* | |
1938 | * Lookup ust app channel for session and enable it on the tracer side. This | |
1939 | * MUST be called with a RCU read side lock acquired. | |
1940 | */ | |
1941 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
1942 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
1943 | { | |
1944 | int ret = 0; | |
1945 | struct lttng_ht_iter iter; | |
1946 | struct lttng_ht_node_str *ua_chan_node; | |
1947 | struct ust_app_channel *ua_chan; | |
1948 | ||
1949 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
1950 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
1951 | if (ua_chan_node == NULL) { | |
77c5447b | 1952 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
1953 | uchan->name, ua_sess->tracing_id); |
1954 | goto error; | |
1955 | } | |
1956 | ||
1957 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
1958 | ||
1959 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
1960 | if (ret < 0) { | |
1961 | goto error; | |
1962 | } | |
1963 | ||
1964 | error: | |
1965 | return ret; | |
1966 | } | |
1967 | ||
1968 | /* | |
1969 | * Ask the consumer to create a channel and get it if successful. | |
1970 | * | |
1971 | * Return 0 on success or else a negative value. | |
1972 | */ | |
1973 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
1974 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
1975 | int bitness, struct ust_registry_session *registry) | |
1976 | { | |
1977 | int ret; | |
1978 | unsigned int nb_fd = 0; | |
1979 | struct consumer_socket *socket; | |
1980 | ||
1981 | assert(usess); | |
1982 | assert(ua_sess); | |
1983 | assert(ua_chan); | |
1984 | assert(registry); | |
1985 | ||
1986 | rcu_read_lock(); | |
1987 | health_code_update(); | |
1988 | ||
1989 | /* Get the right consumer socket for the application. */ | |
1990 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
1991 | if (!socket) { | |
1992 | ret = -EINVAL; | |
1993 | goto error; | |
1994 | } | |
1995 | ||
1996 | health_code_update(); | |
1997 | ||
1998 | /* Need one fd for the channel. */ | |
1999 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2000 | if (ret < 0) { | |
2001 | ERR("Exhausted number of available FD upon create channel"); | |
2002 | goto error; | |
2003 | } | |
2004 | ||
2005 | /* | |
2006 | * Ask consumer to create channel. The consumer will return the number of | |
2007 | * stream we have to expect. | |
2008 | */ | |
2009 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2010 | registry); | |
2011 | if (ret < 0) { | |
2012 | goto error_ask; | |
2013 | } | |
2014 | ||
2015 | /* | |
2016 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2017 | * stream (2 being the default value here). | |
2018 | */ | |
2019 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2020 | ||
2021 | /* Reserve the amount of file descriptor we need. */ | |
2022 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2023 | if (ret < 0) { | |
2024 | ERR("Exhausted number of available FD upon create channel"); | |
2025 | goto error_fd_get_stream; | |
2026 | } | |
2027 | ||
2028 | health_code_update(); | |
2029 | ||
2030 | /* | |
2031 | * Now get the channel from the consumer. This call wil populate the stream | |
2032 | * list of that channel and set the ust objects. | |
2033 | */ | |
d9078d0c DG |
2034 | if (usess->consumer->enabled) { |
2035 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2036 | if (ret < 0) { | |
2037 | goto error_destroy; | |
2038 | } | |
7972aab2 DG |
2039 | } |
2040 | ||
2041 | rcu_read_unlock(); | |
2042 | return 0; | |
2043 | ||
2044 | error_destroy: | |
2045 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2046 | error_fd_get_stream: | |
2047 | /* | |
2048 | * Initiate a destroy channel on the consumer since we had an error | |
2049 | * handling it on our side. The return value is of no importance since we | |
2050 | * already have a ret value set by the previous error that we need to | |
2051 | * return. | |
2052 | */ | |
2053 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2054 | error_ask: | |
2055 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2056 | error: | |
2057 | health_code_update(); | |
2058 | rcu_read_unlock(); | |
2059 | return ret; | |
2060 | } | |
2061 | ||
2062 | /* | |
2063 | * Duplicate the ust data object of the ust app stream and save it in the | |
2064 | * buffer registry stream. | |
2065 | * | |
2066 | * Return 0 on success or else a negative value. | |
2067 | */ | |
2068 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2069 | struct ust_app_stream *stream) | |
2070 | { | |
2071 | int ret; | |
2072 | ||
2073 | assert(reg_stream); | |
2074 | assert(stream); | |
2075 | ||
2076 | /* Reserve the amount of file descriptor we need. */ | |
2077 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2078 | if (ret < 0) { | |
2079 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2080 | goto error; | |
2081 | } | |
2082 | ||
2083 | /* Duplicate object for stream once the original is in the registry. */ | |
2084 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2085 | reg_stream->obj.ust); | |
2086 | if (ret < 0) { | |
2087 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2088 | reg_stream->obj.ust, stream->obj, ret); | |
2089 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2090 | goto error; | |
2091 | } | |
2092 | stream->handle = stream->obj->handle; | |
2093 | ||
2094 | error: | |
2095 | return ret; | |
2096 | } | |
2097 | ||
2098 | /* | |
2099 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2100 | * buffer registry channel. | |
2101 | * | |
2102 | * Return 0 on success or else a negative value. | |
2103 | */ | |
2104 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2105 | struct ust_app_channel *ua_chan) | |
2106 | { | |
2107 | int ret; | |
2108 | ||
2109 | assert(reg_chan); | |
2110 | assert(ua_chan); | |
2111 | ||
2112 | /* Need two fds for the channel. */ | |
2113 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2114 | if (ret < 0) { | |
2115 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2116 | goto error_fd_get; | |
2117 | } | |
2118 | ||
2119 | /* Duplicate object for stream once the original is in the registry. */ | |
2120 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2121 | if (ret < 0) { | |
2122 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2123 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2124 | goto error; | |
2125 | } | |
2126 | ua_chan->handle = ua_chan->obj->handle; | |
2127 | ||
2128 | return 0; | |
2129 | ||
2130 | error: | |
2131 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2132 | error_fd_get: | |
2133 | return ret; | |
2134 | } | |
2135 | ||
2136 | /* | |
2137 | * For a given channel buffer registry, setup all streams of the given ust | |
2138 | * application channel. | |
2139 | * | |
2140 | * Return 0 on success or else a negative value. | |
2141 | */ | |
2142 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2143 | struct ust_app_channel *ua_chan) | |
2144 | { | |
2145 | int ret = 0; | |
2146 | struct ust_app_stream *stream, *stmp; | |
2147 | ||
2148 | assert(reg_chan); | |
2149 | assert(ua_chan); | |
2150 | ||
2151 | DBG2("UST app setup buffer registry stream"); | |
2152 | ||
2153 | /* Send all streams to application. */ | |
2154 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2155 | struct buffer_reg_stream *reg_stream; | |
2156 | ||
2157 | ret = buffer_reg_stream_create(®_stream); | |
2158 | if (ret < 0) { | |
2159 | goto error; | |
2160 | } | |
2161 | ||
2162 | /* | |
2163 | * Keep original pointer and nullify it in the stream so the delete | |
2164 | * stream call does not release the object. | |
2165 | */ | |
2166 | reg_stream->obj.ust = stream->obj; | |
2167 | stream->obj = NULL; | |
2168 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2169 | |
7972aab2 DG |
2170 | /* We don't need the streams anymore. */ |
2171 | cds_list_del(&stream->list); | |
2172 | delete_ust_app_stream(-1, stream); | |
2173 | } | |
421cb601 | 2174 | |
7972aab2 DG |
2175 | error: |
2176 | return ret; | |
2177 | } | |
2178 | ||
2179 | /* | |
2180 | * Create a buffer registry channel for the given session registry and | |
2181 | * application channel object. If regp pointer is valid, it's set with the | |
2182 | * created object. Important, the created object is NOT added to the session | |
2183 | * registry hash table. | |
2184 | * | |
2185 | * Return 0 on success else a negative value. | |
2186 | */ | |
2187 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2188 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2189 | { | |
2190 | int ret; | |
2191 | struct buffer_reg_channel *reg_chan = NULL; | |
2192 | ||
2193 | assert(reg_sess); | |
2194 | assert(ua_chan); | |
2195 | ||
2196 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2197 | ||
2198 | /* Create buffer registry channel. */ | |
2199 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2200 | if (ret < 0) { | |
2201 | goto error_create; | |
421cb601 | 2202 | } |
7972aab2 DG |
2203 | assert(reg_chan); |
2204 | reg_chan->consumer_key = ua_chan->key; | |
421cb601 | 2205 | |
7972aab2 DG |
2206 | /* Create and add a channel registry to session. */ |
2207 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2208 | ua_chan->tracing_channel_id); | |
2209 | if (ret < 0) { | |
2210 | goto error; | |
d88aee68 | 2211 | } |
7972aab2 | 2212 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2213 | |
7972aab2 DG |
2214 | if (regp) { |
2215 | *regp = reg_chan; | |
3d8ca23b | 2216 | } |
d88aee68 | 2217 | |
7972aab2 | 2218 | return 0; |
3d8ca23b DG |
2219 | |
2220 | error: | |
7972aab2 DG |
2221 | /* Safe because the registry channel object was not added to any HT. */ |
2222 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2223 | error_create: | |
3d8ca23b | 2224 | return ret; |
421cb601 DG |
2225 | } |
2226 | ||
55cc08a6 | 2227 | /* |
7972aab2 DG |
2228 | * Setup buffer registry channel for the given session registry and application |
2229 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2230 | * |
7972aab2 | 2231 | * Return 0 on success else a negative value. |
55cc08a6 | 2232 | */ |
7972aab2 DG |
2233 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2234 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2235 | { |
7972aab2 | 2236 | int ret; |
55cc08a6 | 2237 | |
7972aab2 DG |
2238 | assert(reg_sess); |
2239 | assert(reg_chan); | |
2240 | assert(ua_chan); | |
2241 | assert(ua_chan->obj); | |
55cc08a6 | 2242 | |
7972aab2 | 2243 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2244 | |
7972aab2 DG |
2245 | /* Setup all streams for the registry. */ |
2246 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2247 | if (ret < 0) { | |
55cc08a6 DG |
2248 | goto error; |
2249 | } | |
2250 | ||
7972aab2 DG |
2251 | reg_chan->obj.ust = ua_chan->obj; |
2252 | ua_chan->obj = NULL; | |
55cc08a6 | 2253 | |
7972aab2 | 2254 | return 0; |
55cc08a6 DG |
2255 | |
2256 | error: | |
7972aab2 DG |
2257 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2258 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2259 | return ret; |
2260 | } | |
2261 | ||
edb67388 | 2262 | /* |
7972aab2 | 2263 | * Send buffer registry channel to the application. |
d0b96690 | 2264 | * |
7972aab2 | 2265 | * Return 0 on success else a negative value. |
edb67388 | 2266 | */ |
7972aab2 DG |
2267 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2268 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2269 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2270 | { |
2271 | int ret; | |
7972aab2 | 2272 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2273 | |
7972aab2 DG |
2274 | assert(reg_chan); |
2275 | assert(app); | |
2276 | assert(ua_sess); | |
2277 | assert(ua_chan); | |
2278 | ||
2279 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2280 | ||
2281 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2282 | if (ret < 0) { |
2283 | goto error; | |
2284 | } | |
2285 | ||
7972aab2 DG |
2286 | /* Send channel to the application. */ |
2287 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2288 | if (ret < 0) { | |
2289 | goto error; | |
2290 | } | |
2291 | ||
2292 | health_code_update(); | |
2293 | ||
2294 | /* Send all streams to application. */ | |
2295 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2296 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2297 | struct ust_app_stream stream; | |
2298 | ||
2299 | ret = duplicate_stream_object(reg_stream, &stream); | |
2300 | if (ret < 0) { | |
2301 | goto error_stream_unlock; | |
2302 | } | |
2303 | ||
2304 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2305 | if (ret < 0) { | |
8c067051 | 2306 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2307 | goto error_stream_unlock; |
2308 | } | |
edb67388 | 2309 | |
7972aab2 DG |
2310 | /* |
2311 | * The return value is not important here. This function will output an | |
2312 | * error if needed. | |
2313 | */ | |
2314 | (void) release_ust_app_stream(-1, &stream); | |
2315 | } | |
2316 | ua_chan->is_sent = 1; | |
2317 | ||
2318 | error_stream_unlock: | |
2319 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2320 | error: |
2321 | return ret; | |
2322 | } | |
2323 | ||
9730260e | 2324 | /* |
7972aab2 DG |
2325 | * Create and send to the application the created buffers with per UID buffers. |
2326 | * | |
2327 | * Return 0 on success else a negative value. | |
9730260e | 2328 | */ |
7972aab2 DG |
2329 | static int create_channel_per_uid(struct ust_app *app, |
2330 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2331 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2332 | { |
2333 | int ret; | |
7972aab2 DG |
2334 | struct buffer_reg_uid *reg_uid; |
2335 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2336 | |
7972aab2 DG |
2337 | assert(app); |
2338 | assert(usess); | |
2339 | assert(ua_sess); | |
2340 | assert(ua_chan); | |
2341 | ||
2342 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2343 | ||
2344 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2345 | /* | |
2346 | * The session creation handles the creation of this global registry | |
2347 | * object. If none can be find, there is a code flow problem or a | |
2348 | * teardown race. | |
2349 | */ | |
2350 | assert(reg_uid); | |
2351 | ||
2352 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2353 | reg_uid); | |
2354 | if (!reg_chan) { | |
2355 | /* Create the buffer registry channel object. */ | |
2356 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2357 | if (ret < 0) { | |
2358 | goto error; | |
2359 | } | |
2360 | assert(reg_chan); | |
2361 | ||
2362 | /* | |
2363 | * Create the buffers on the consumer side. This call populates the | |
2364 | * ust app channel object with all streams and data object. | |
2365 | */ | |
2366 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2367 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2368 | if (ret < 0) { | |
07d2ae95 DG |
2369 | /* |
2370 | * Let's remove the previously created buffer registry channel so | |
2371 | * it's not visible anymore in the session registry. | |
2372 | */ | |
2373 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2374 | ua_chan->tracing_channel_id); | |
2375 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2376 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2377 | goto error; |
2378 | } | |
2379 | ||
2380 | /* | |
2381 | * Setup the streams and add it to the session registry. | |
2382 | */ | |
2383 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2384 | if (ret < 0) { | |
2385 | goto error; | |
2386 | } | |
2387 | ||
2388 | } | |
2389 | ||
2390 | /* Send buffers to the application. */ | |
2391 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2392 | if (ret < 0) { |
2393 | goto error; | |
2394 | } | |
2395 | ||
9730260e DG |
2396 | error: |
2397 | return ret; | |
2398 | } | |
2399 | ||
78f0bacd | 2400 | /* |
7972aab2 DG |
2401 | * Create and send to the application the created buffers with per PID buffers. |
2402 | * | |
2403 | * Return 0 on success else a negative value. | |
78f0bacd | 2404 | */ |
7972aab2 DG |
2405 | static int create_channel_per_pid(struct ust_app *app, |
2406 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2407 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2408 | { |
8535a6d9 | 2409 | int ret; |
7972aab2 | 2410 | struct ust_registry_session *registry; |
78f0bacd | 2411 | |
7972aab2 DG |
2412 | assert(app); |
2413 | assert(usess); | |
2414 | assert(ua_sess); | |
2415 | assert(ua_chan); | |
2416 | ||
2417 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2418 | ||
2419 | rcu_read_lock(); | |
2420 | ||
2421 | registry = get_session_registry(ua_sess); | |
2422 | assert(registry); | |
2423 | ||
2424 | /* Create and add a new channel registry to session. */ | |
2425 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2426 | if (ret < 0) { |
2427 | goto error; | |
2428 | } | |
2429 | ||
7972aab2 DG |
2430 | /* Create and get channel on the consumer side. */ |
2431 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2432 | app->bits_per_long, registry); | |
2433 | if (ret < 0) { | |
2434 | goto error; | |
2435 | } | |
2436 | ||
2437 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2438 | if (ret < 0) { | |
2439 | goto error; | |
2440 | } | |
8535a6d9 | 2441 | |
78f0bacd | 2442 | error: |
7972aab2 | 2443 | rcu_read_unlock(); |
78f0bacd DG |
2444 | return ret; |
2445 | } | |
2446 | ||
2447 | /* | |
7972aab2 DG |
2448 | * From an already allocated ust app channel, create the channel buffers if |
2449 | * need and send it to the application. This MUST be called with a RCU read | |
2450 | * side lock acquired. | |
2451 | * | |
2452 | * Return 0 on success or else a negative value. | |
78f0bacd | 2453 | */ |
7972aab2 DG |
2454 | static int do_create_channel(struct ust_app *app, |
2455 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2456 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2457 | { |
7972aab2 | 2458 | int ret; |
78f0bacd | 2459 | |
7972aab2 DG |
2460 | assert(app); |
2461 | assert(usess); | |
2462 | assert(ua_sess); | |
2463 | assert(ua_chan); | |
2464 | ||
2465 | /* Handle buffer type before sending the channel to the application. */ | |
2466 | switch (usess->buffer_type) { | |
2467 | case LTTNG_BUFFER_PER_UID: | |
2468 | { | |
2469 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2470 | if (ret < 0) { | |
2471 | goto error; | |
2472 | } | |
2473 | break; | |
2474 | } | |
2475 | case LTTNG_BUFFER_PER_PID: | |
2476 | { | |
2477 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2478 | if (ret < 0) { | |
2479 | goto error; | |
2480 | } | |
2481 | break; | |
2482 | } | |
2483 | default: | |
2484 | assert(0); | |
2485 | ret = -EINVAL; | |
78f0bacd DG |
2486 | goto error; |
2487 | } | |
2488 | ||
7972aab2 DG |
2489 | /* Initialize ust objd object using the received handle and add it. */ |
2490 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2491 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2492 | |
7972aab2 DG |
2493 | /* If channel is not enabled, disable it on the tracer */ |
2494 | if (!ua_chan->enabled) { | |
2495 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2496 | if (ret < 0) { | |
2497 | goto error; | |
2498 | } | |
78f0bacd DG |
2499 | } |
2500 | ||
2501 | error: | |
2502 | return ret; | |
2503 | } | |
2504 | ||
284d8f55 | 2505 | /* |
4d710ac2 DG |
2506 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2507 | * newly created channel if not NULL. | |
d0b96690 | 2508 | * |
36b588ed | 2509 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2510 | * |
2511 | * Return 0 on success or else a negative value. | |
284d8f55 | 2512 | */ |
4d710ac2 DG |
2513 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2514 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2515 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2516 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2517 | { |
2518 | int ret = 0; | |
bec39940 DG |
2519 | struct lttng_ht_iter iter; |
2520 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2521 | struct ust_app_channel *ua_chan; |
2522 | ||
2523 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2524 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2525 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2526 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2527 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2528 | goto end; |
5b4a0ec0 DG |
2529 | } |
2530 | ||
d0b96690 | 2531 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2532 | if (ua_chan == NULL) { |
2533 | /* Only malloc can fail here */ | |
4d710ac2 | 2534 | ret = -ENOMEM; |
094d1690 | 2535 | goto error_alloc; |
fc34caaa DG |
2536 | } |
2537 | shadow_copy_channel(ua_chan, uchan); | |
2538 | ||
ffe60014 DG |
2539 | /* Set channel type. */ |
2540 | ua_chan->attr.type = type; | |
2541 | ||
7972aab2 | 2542 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2543 | if (ret < 0) { |
2544 | goto error; | |
2545 | } | |
2546 | ||
fc34caaa | 2547 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2548 | app->pid); |
fc34caaa | 2549 | |
d0b96690 DG |
2550 | /* Only add the channel if successful on the tracer side. */ |
2551 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2552 | ||
fc34caaa | 2553 | end: |
4d710ac2 DG |
2554 | if (ua_chanp) { |
2555 | *ua_chanp = ua_chan; | |
2556 | } | |
2557 | ||
2558 | /* Everything went well. */ | |
2559 | return 0; | |
5b4a0ec0 DG |
2560 | |
2561 | error: | |
d0b96690 | 2562 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2563 | error_alloc: |
4d710ac2 | 2564 | return ret; |
5b4a0ec0 DG |
2565 | } |
2566 | ||
2567 | /* | |
2568 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2569 | * |
2570 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2571 | */ |
edb67388 DG |
2572 | static |
2573 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2574 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2575 | struct ust_app *app) | |
284d8f55 | 2576 | { |
edb67388 | 2577 | int ret = 0; |
5b4a0ec0 | 2578 | struct ust_app_event *ua_event; |
284d8f55 | 2579 | |
5b4a0ec0 | 2580 | /* Get event node */ |
18eace3b DG |
2581 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
2582 | uevent->filter, uevent->attr.loglevel); | |
2583 | if (ua_event != NULL) { | |
fc34caaa | 2584 | ret = -EEXIST; |
edb67388 DG |
2585 | goto end; |
2586 | } | |
5b4a0ec0 | 2587 | |
edb67388 DG |
2588 | /* Does not exist so create one */ |
2589 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2590 | if (ua_event == NULL) { | |
2591 | /* Only malloc can failed so something is really wrong */ | |
2592 | ret = -ENOMEM; | |
fc34caaa | 2593 | goto end; |
5b4a0ec0 | 2594 | } |
edb67388 | 2595 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2596 | |
edb67388 | 2597 | /* Create it on the tracer side */ |
5b4a0ec0 | 2598 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2599 | if (ret < 0) { |
fc34caaa | 2600 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2601 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2602 | goto error; |
2603 | } | |
2604 | ||
d0b96690 | 2605 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2606 | |
fc34caaa | 2607 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2608 | app->pid); |
7f79d3a1 | 2609 | |
edb67388 | 2610 | end: |
fc34caaa DG |
2611 | return ret; |
2612 | ||
5b4a0ec0 | 2613 | error: |
fc34caaa DG |
2614 | /* Valid. Calling here is already in a read side lock */ |
2615 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2616 | return ret; |
5b4a0ec0 DG |
2617 | } |
2618 | ||
2619 | /* | |
2620 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2621 | * |
7972aab2 | 2622 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2623 | */ |
2624 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
d65d2de8 DG |
2625 | struct ust_app *app, struct consumer_output *consumer, |
2626 | struct ustctl_consumer_channel_attr *attr) | |
5b4a0ec0 DG |
2627 | { |
2628 | int ret = 0; | |
ffe60014 | 2629 | struct ust_app_channel *metadata; |
d88aee68 | 2630 | struct consumer_socket *socket; |
7972aab2 | 2631 | struct ust_registry_session *registry; |
5b4a0ec0 | 2632 | |
ffe60014 DG |
2633 | assert(ua_sess); |
2634 | assert(app); | |
d88aee68 | 2635 | assert(consumer); |
5b4a0ec0 | 2636 | |
7972aab2 DG |
2637 | registry = get_session_registry(ua_sess); |
2638 | assert(registry); | |
2639 | ||
1b532a60 DG |
2640 | /* Metadata already exists for this registry or it was closed previously */ |
2641 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2642 | ret = 0; |
2643 | goto error; | |
5b4a0ec0 DG |
2644 | } |
2645 | ||
ffe60014 | 2646 | /* Allocate UST metadata */ |
d0b96690 | 2647 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2648 | if (!metadata) { |
2649 | /* malloc() failed */ | |
2650 | ret = -ENOMEM; | |
2651 | goto error; | |
2652 | } | |
5b4a0ec0 | 2653 | |
d65d2de8 DG |
2654 | if (!attr) { |
2655 | /* Set default attributes for metadata. */ | |
2656 | metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
2657 | metadata->attr.subbuf_size = default_get_metadata_subbuf_size(); | |
2658 | metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
0a9c6494 DG |
2659 | metadata->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER; |
2660 | metadata->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER; | |
d65d2de8 DG |
2661 | metadata->attr.output = LTTNG_UST_MMAP; |
2662 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2663 | } else { | |
2664 | memcpy(&metadata->attr, attr, sizeof(metadata->attr)); | |
2665 | metadata->attr.output = LTTNG_UST_MMAP; | |
2666 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2667 | } | |
5b4a0ec0 | 2668 | |
7972aab2 DG |
2669 | /* Need one fd for the channel. */ |
2670 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2671 | if (ret < 0) { | |
2672 | ERR("Exhausted number of available FD upon create metadata"); | |
2673 | goto error; | |
2674 | } | |
2675 | ||
4dc3dfc5 DG |
2676 | /* Get the right consumer socket for the application. */ |
2677 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2678 | if (!socket) { | |
2679 | ret = -EINVAL; | |
2680 | goto error_consumer; | |
2681 | } | |
2682 | ||
331744e3 JD |
2683 | /* |
2684 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2685 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2686 | * consumer requesting the metadata and the ask_channel call on our side | |
2687 | * did not returned yet. | |
2688 | */ | |
2689 | registry->metadata_key = metadata->key; | |
2690 | ||
d88aee68 DG |
2691 | /* |
2692 | * Ask the metadata channel creation to the consumer. The metadata object | |
2693 | * will be created by the consumer and kept their. However, the stream is | |
2694 | * never added or monitored until we do a first push metadata to the | |
2695 | * consumer. | |
2696 | */ | |
7972aab2 DG |
2697 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2698 | registry); | |
d88aee68 | 2699 | if (ret < 0) { |
f2a444f1 DG |
2700 | /* Nullify the metadata key so we don't try to close it later on. */ |
2701 | registry->metadata_key = 0; | |
d88aee68 DG |
2702 | goto error_consumer; |
2703 | } | |
2704 | ||
2705 | /* | |
2706 | * The setup command will make the metadata stream be sent to the relayd, | |
2707 | * if applicable, and the thread managing the metadatas. This is important | |
2708 | * because after this point, if an error occurs, the only way the stream | |
2709 | * can be deleted is to be monitored in the consumer. | |
2710 | */ | |
7972aab2 | 2711 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2712 | if (ret < 0) { |
f2a444f1 DG |
2713 | /* Nullify the metadata key so we don't try to close it later on. */ |
2714 | registry->metadata_key = 0; | |
d88aee68 | 2715 | goto error_consumer; |
5b4a0ec0 DG |
2716 | } |
2717 | ||
7972aab2 DG |
2718 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2719 | metadata->key, app->pid); | |
5b4a0ec0 | 2720 | |
d88aee68 | 2721 | error_consumer: |
b80f0b6c | 2722 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2723 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2724 | error: |
ffe60014 | 2725 | return ret; |
5b4a0ec0 DG |
2726 | } |
2727 | ||
2728 | /* | |
2729 | * Return pointer to traceable apps list. | |
2730 | */ | |
bec39940 | 2731 | struct lttng_ht *ust_app_get_ht(void) |
5b4a0ec0 DG |
2732 | { |
2733 | return ust_app_ht; | |
2734 | } | |
2735 | ||
2736 | /* | |
d88aee68 DG |
2737 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2738 | * acquired before calling this function. | |
5b4a0ec0 DG |
2739 | */ |
2740 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2741 | { | |
d88aee68 | 2742 | struct ust_app *app = NULL; |
bec39940 DG |
2743 | struct lttng_ht_node_ulong *node; |
2744 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2745 | |
bec39940 DG |
2746 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2747 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2748 | if (node == NULL) { |
2749 | DBG2("UST app no found with pid %d", pid); | |
2750 | goto error; | |
2751 | } | |
5b4a0ec0 DG |
2752 | |
2753 | DBG2("Found UST app by pid %d", pid); | |
2754 | ||
d88aee68 | 2755 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2756 | |
2757 | error: | |
d88aee68 | 2758 | return app; |
5b4a0ec0 DG |
2759 | } |
2760 | ||
d88aee68 DG |
2761 | /* |
2762 | * Allocate and init an UST app object using the registration information and | |
2763 | * the command socket. This is called when the command socket connects to the | |
2764 | * session daemon. | |
2765 | * | |
2766 | * The object is returned on success or else NULL. | |
2767 | */ | |
d0b96690 | 2768 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2769 | { |
d0b96690 DG |
2770 | struct ust_app *lta = NULL; |
2771 | ||
2772 | assert(msg); | |
2773 | assert(sock >= 0); | |
2774 | ||
2775 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2776 | |
173af62f DG |
2777 | if ((msg->bits_per_long == 64 && |
2778 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2779 | || (msg->bits_per_long == 32 && | |
2780 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2781 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2782 | "%d-bit long, but no consumerd for this size is available.\n", |
2783 | msg->name, msg->pid, msg->bits_per_long); | |
2784 | goto error; | |
3f2c5fcc | 2785 | } |
d0b96690 | 2786 | |
5b4a0ec0 DG |
2787 | lta = zmalloc(sizeof(struct ust_app)); |
2788 | if (lta == NULL) { | |
2789 | PERROR("malloc"); | |
d0b96690 | 2790 | goto error; |
5b4a0ec0 DG |
2791 | } |
2792 | ||
2793 | lta->ppid = msg->ppid; | |
2794 | lta->uid = msg->uid; | |
2795 | lta->gid = msg->gid; | |
d0b96690 | 2796 | |
7753dea8 | 2797 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2798 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2799 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2800 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2801 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2802 | lta->long_alignment = msg->long_alignment; | |
2803 | lta->byte_order = msg->byte_order; | |
2804 | ||
5b4a0ec0 DG |
2805 | lta->v_major = msg->major; |
2806 | lta->v_minor = msg->minor; | |
77c5447b | 2807 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
2808 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2809 | lta->notify_sock = -1; | |
d88aee68 DG |
2810 | |
2811 | /* Copy name and make sure it's NULL terminated. */ | |
2812 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2813 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2814 | ||
2815 | /* | |
2816 | * Before this can be called, when receiving the registration information, | |
2817 | * the application compatibility is checked. So, at this point, the | |
2818 | * application can work with this session daemon. | |
2819 | */ | |
d0b96690 | 2820 | lta->compatible = 1; |
5b4a0ec0 | 2821 | |
852d0037 | 2822 | lta->pid = msg->pid; |
d0b96690 | 2823 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2824 | lta->sock = sock; |
d0b96690 | 2825 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2826 | |
d42f20df DG |
2827 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2828 | ||
d0b96690 DG |
2829 | error: |
2830 | return lta; | |
2831 | } | |
2832 | ||
d88aee68 DG |
2833 | /* |
2834 | * For a given application object, add it to every hash table. | |
2835 | */ | |
d0b96690 DG |
2836 | void ust_app_add(struct ust_app *app) |
2837 | { | |
2838 | assert(app); | |
2839 | assert(app->notify_sock >= 0); | |
2840 | ||
5b4a0ec0 | 2841 | rcu_read_lock(); |
852d0037 DG |
2842 | |
2843 | /* | |
2844 | * On a re-registration, we want to kick out the previous registration of | |
2845 | * that pid | |
2846 | */ | |
d0b96690 | 2847 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
2848 | |
2849 | /* | |
2850 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
2851 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
2852 | * already in the table. | |
2853 | */ | |
d0b96690 | 2854 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 2855 | |
d0b96690 DG |
2856 | /* Add application to the notify socket hash table. */ |
2857 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
2858 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 2859 | |
d0b96690 | 2860 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
2861 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
2862 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
2863 | app->v_minor); | |
5b4a0ec0 | 2864 | |
d0b96690 DG |
2865 | rcu_read_unlock(); |
2866 | } | |
2867 | ||
d88aee68 DG |
2868 | /* |
2869 | * Set the application version into the object. | |
2870 | * | |
2871 | * Return 0 on success else a negative value either an errno code or a | |
2872 | * LTTng-UST error code. | |
2873 | */ | |
d0b96690 DG |
2874 | int ust_app_version(struct ust_app *app) |
2875 | { | |
d88aee68 DG |
2876 | int ret; |
2877 | ||
d0b96690 | 2878 | assert(app); |
d88aee68 DG |
2879 | |
2880 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2881 | if (ret < 0) { | |
2882 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2883 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2884 | } else { | |
2885 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2886 | } | |
2887 | } | |
2888 | ||
2889 | return ret; | |
5b4a0ec0 DG |
2890 | } |
2891 | ||
2892 | /* | |
2893 | * Unregister app by removing it from the global traceable app list and freeing | |
2894 | * the data struct. | |
2895 | * | |
2896 | * The socket is already closed at this point so no close to sock. | |
2897 | */ | |
2898 | void ust_app_unregister(int sock) | |
2899 | { | |
2900 | struct ust_app *lta; | |
bec39940 DG |
2901 | struct lttng_ht_node_ulong *node; |
2902 | struct lttng_ht_iter iter; | |
d42f20df | 2903 | struct ust_app_session *ua_sess; |
525b0740 | 2904 | int ret; |
5b4a0ec0 DG |
2905 | |
2906 | rcu_read_lock(); | |
886459c6 | 2907 | |
5b4a0ec0 | 2908 | /* Get the node reference for a call_rcu */ |
852d0037 | 2909 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 2910 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 2911 | assert(node); |
284d8f55 | 2912 | |
852d0037 | 2913 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
2914 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
2915 | ||
886459c6 | 2916 | /* Remove application from PID hash table */ |
852d0037 DG |
2917 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
2918 | assert(!ret); | |
2919 | ||
d88aee68 DG |
2920 | /* |
2921 | * Remove application from notify hash table. The thread handling the | |
2922 | * notify socket could have deleted the node so ignore on error because | |
2923 | * either way it's valid. The close of that socket is handled by the other | |
2924 | * thread. | |
2925 | */ | |
d0b96690 | 2926 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 2927 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 2928 | |
5b98a774 DG |
2929 | /* |
2930 | * Ignore return value since the node might have been removed before by an | |
2931 | * add replace during app registration because the PID can be reassigned by | |
2932 | * the OS. | |
2933 | */ | |
d0b96690 | 2934 | iter.iter.node = <a->pid_n.node; |
bec39940 | 2935 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
2936 | if (ret) { |
2937 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
2938 | lta->pid); | |
2939 | } | |
852d0037 | 2940 | |
d42f20df DG |
2941 | /* Remove sessions so they are not visible during deletion.*/ |
2942 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
2943 | node.node) { | |
7972aab2 DG |
2944 | struct ust_registry_session *registry; |
2945 | ||
d42f20df DG |
2946 | ret = lttng_ht_del(lta->sessions, &iter); |
2947 | if (ret) { | |
2948 | /* The session was already removed so scheduled for teardown. */ | |
2949 | continue; | |
2950 | } | |
2951 | ||
2952 | /* | |
2953 | * Add session to list for teardown. This is safe since at this point we | |
2954 | * are the only one using this list. | |
2955 | */ | |
d88aee68 DG |
2956 | pthread_mutex_lock(&ua_sess->lock); |
2957 | ||
2958 | /* | |
2959 | * Normally, this is done in the delete session process which is | |
2960 | * executed in the call rcu below. However, upon registration we can't | |
2961 | * afford to wait for the grace period before pushing data or else the | |
2962 | * data pending feature can race between the unregistration and stop | |
2963 | * command where the data pending command is sent *before* the grace | |
2964 | * period ended. | |
2965 | * | |
2966 | * The close metadata below nullifies the metadata pointer in the | |
2967 | * session so the delete session will NOT push/close a second time. | |
2968 | */ | |
7972aab2 | 2969 | registry = get_session_registry(ua_sess); |
1b532a60 | 2970 | if (registry && !registry->metadata_closed) { |
7972aab2 DG |
2971 | /* Push metadata for application before freeing the application. */ |
2972 | (void) push_metadata(registry, ua_sess->consumer); | |
2973 | ||
2974 | /* | |
2975 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
2976 | * metadata only on destroy trace session in this case. Also, the |
2977 | * previous push metadata could have flag the metadata registry to | |
2978 | * close so don't send a close command if closed. | |
7972aab2 | 2979 | */ |
1b532a60 DG |
2980 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
2981 | !registry->metadata_closed) { | |
7972aab2 DG |
2982 | /* And ask to close it for this session registry. */ |
2983 | (void) close_metadata(registry, ua_sess->consumer); | |
2984 | } | |
2985 | } | |
d88aee68 | 2986 | |
d42f20df | 2987 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 2988 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
2989 | } |
2990 | ||
852d0037 DG |
2991 | /* Free memory */ |
2992 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
2993 | ||
5b4a0ec0 DG |
2994 | rcu_read_unlock(); |
2995 | return; | |
284d8f55 DG |
2996 | } |
2997 | ||
2998 | /* | |
5b4a0ec0 | 2999 | * Return traceable_app_count |
284d8f55 | 3000 | */ |
5b4a0ec0 | 3001 | unsigned long ust_app_list_count(void) |
284d8f55 | 3002 | { |
5b4a0ec0 | 3003 | unsigned long count; |
284d8f55 | 3004 | |
5b4a0ec0 | 3005 | rcu_read_lock(); |
bec39940 | 3006 | count = lttng_ht_get_count(ust_app_ht); |
5b4a0ec0 | 3007 | rcu_read_unlock(); |
284d8f55 | 3008 | |
5b4a0ec0 | 3009 | return count; |
284d8f55 DG |
3010 | } |
3011 | ||
5b4a0ec0 DG |
3012 | /* |
3013 | * Fill events array with all events name of all registered apps. | |
3014 | */ | |
3015 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3016 | { |
5b4a0ec0 DG |
3017 | int ret, handle; |
3018 | size_t nbmem, count = 0; | |
bec39940 | 3019 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3020 | struct ust_app *app; |
c617c0c6 | 3021 | struct lttng_event *tmp_event; |
421cb601 | 3022 | |
5b4a0ec0 | 3023 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3024 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3025 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3026 | PERROR("zmalloc ust app events"); |
3027 | ret = -ENOMEM; | |
421cb601 DG |
3028 | goto error; |
3029 | } | |
3030 | ||
5b4a0ec0 | 3031 | rcu_read_lock(); |
421cb601 | 3032 | |
852d0037 | 3033 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3034 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3035 | |
840cb59c | 3036 | health_code_update(); |
86acf0da | 3037 | |
e0c7ec2b DG |
3038 | if (!app->compatible) { |
3039 | /* | |
3040 | * TODO: In time, we should notice the caller of this error by | |
3041 | * telling him that this is a version error. | |
3042 | */ | |
3043 | continue; | |
3044 | } | |
852d0037 | 3045 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3046 | if (handle < 0) { |
ffe60014 DG |
3047 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3048 | ERR("UST app list events getting handle failed for app pid %d", | |
3049 | app->pid); | |
3050 | } | |
5b4a0ec0 DG |
3051 | continue; |
3052 | } | |
421cb601 | 3053 | |
852d0037 | 3054 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3055 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3056 | /* Handle ustctl error. */ |
3057 | if (ret < 0) { | |
3058 | free(tmp_event); | |
3059 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3060 | ERR("UST app tp list get failed for app %d with ret %d", | |
3061 | app->sock, ret); | |
3062 | } else { | |
3063 | DBG3("UST app tp list get failed. Application is dead"); | |
47cb9d4a DG |
3064 | /* |
3065 | * This is normal behavior, an application can die during the | |
3066 | * creation process. Don't report an error so the execution can | |
3067 | * continue normally. Continue normal execution. | |
3068 | */ | |
3069 | break; | |
ffe60014 DG |
3070 | } |
3071 | goto rcu_error; | |
3072 | } | |
3073 | ||
840cb59c | 3074 | health_code_update(); |
815564d8 | 3075 | if (count >= nbmem) { |
d7b3776f | 3076 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3077 | void *ptr; |
3078 | ||
815564d8 MD |
3079 | DBG2("Reallocating event list from %zu to %zu entries", nbmem, |
3080 | 2 * nbmem); | |
3081 | nbmem *= 2; | |
c617c0c6 MD |
3082 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event)); |
3083 | if (ptr == NULL) { | |
5b4a0ec0 | 3084 | PERROR("realloc ust app events"); |
c617c0c6 | 3085 | free(tmp_event); |
5b4a0ec0 DG |
3086 | ret = -ENOMEM; |
3087 | goto rcu_error; | |
3088 | } | |
c617c0c6 | 3089 | tmp_event = ptr; |
5b4a0ec0 | 3090 | } |
c617c0c6 MD |
3091 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3092 | tmp_event[count].loglevel = uiter.loglevel; | |
3093 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3094 | tmp_event[count].pid = app->pid; | |
3095 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3096 | count++; |
421cb601 | 3097 | } |
421cb601 DG |
3098 | } |
3099 | ||
5b4a0ec0 | 3100 | ret = count; |
c617c0c6 | 3101 | *events = tmp_event; |
421cb601 | 3102 | |
5b4a0ec0 | 3103 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3104 | |
5b4a0ec0 DG |
3105 | rcu_error: |
3106 | rcu_read_unlock(); | |
421cb601 | 3107 | error: |
840cb59c | 3108 | health_code_update(); |
5b4a0ec0 | 3109 | return ret; |
421cb601 DG |
3110 | } |
3111 | ||
f37d259d MD |
3112 | /* |
3113 | * Fill events array with all events name of all registered apps. | |
3114 | */ | |
3115 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3116 | { | |
3117 | int ret, handle; | |
3118 | size_t nbmem, count = 0; | |
3119 | struct lttng_ht_iter iter; | |
3120 | struct ust_app *app; | |
c617c0c6 | 3121 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3122 | |
3123 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3124 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3125 | if (tmp_event == NULL) { | |
f37d259d MD |
3126 | PERROR("zmalloc ust app event fields"); |
3127 | ret = -ENOMEM; | |
3128 | goto error; | |
3129 | } | |
3130 | ||
3131 | rcu_read_lock(); | |
3132 | ||
3133 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3134 | struct lttng_ust_field_iter uiter; | |
3135 | ||
840cb59c | 3136 | health_code_update(); |
86acf0da | 3137 | |
f37d259d MD |
3138 | if (!app->compatible) { |
3139 | /* | |
3140 | * TODO: In time, we should notice the caller of this error by | |
3141 | * telling him that this is a version error. | |
3142 | */ | |
3143 | continue; | |
3144 | } | |
3145 | handle = ustctl_tracepoint_field_list(app->sock); | |
3146 | if (handle < 0) { | |
ffe60014 DG |
3147 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3148 | ERR("UST app list field getting handle failed for app pid %d", | |
3149 | app->pid); | |
3150 | } | |
f37d259d MD |
3151 | continue; |
3152 | } | |
3153 | ||
3154 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3155 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3156 | /* Handle ustctl error. */ |
3157 | if (ret < 0) { | |
3158 | free(tmp_event); | |
3159 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3160 | ERR("UST app tp list field failed for app %d with ret %d", | |
3161 | app->sock, ret); | |
3162 | } else { | |
3163 | DBG3("UST app tp list field failed. Application is dead"); | |
47cb9d4a DG |
3164 | /* |
3165 | * This is normal behavior, an application can die during the | |
3166 | * creation process. Don't report an error so the execution can | |
3167 | * continue normally. | |
3168 | */ | |
3169 | break; | |
ffe60014 DG |
3170 | } |
3171 | goto rcu_error; | |
3172 | } | |
3173 | ||
840cb59c | 3174 | health_code_update(); |
f37d259d | 3175 | if (count >= nbmem) { |
d7b3776f | 3176 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3177 | void *ptr; |
3178 | ||
f37d259d MD |
3179 | DBG2("Reallocating event field list from %zu to %zu entries", nbmem, |
3180 | 2 * nbmem); | |
3181 | nbmem *= 2; | |
c617c0c6 MD |
3182 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field)); |
3183 | if (ptr == NULL) { | |
f37d259d | 3184 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3185 | free(tmp_event); |
f37d259d MD |
3186 | ret = -ENOMEM; |
3187 | goto rcu_error; | |
3188 | } | |
c617c0c6 | 3189 | tmp_event = ptr; |
f37d259d | 3190 | } |
f37d259d | 3191 | |
c617c0c6 | 3192 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
13d9b823 DG |
3193 | /* Mapping between these enums matches 1 to 1. */ |
3194 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3195 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3196 | |
c617c0c6 MD |
3197 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3198 | tmp_event[count].event.loglevel = uiter.loglevel; | |
13d9b823 | 3199 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3200 | tmp_event[count].event.pid = app->pid; |
3201 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3202 | count++; |
3203 | } | |
3204 | } | |
3205 | ||
3206 | ret = count; | |
c617c0c6 | 3207 | *fields = tmp_event; |
f37d259d MD |
3208 | |
3209 | DBG2("UST app list event fields done (%zu events)", count); | |
3210 | ||
3211 | rcu_error: | |
3212 | rcu_read_unlock(); | |
3213 | error: | |
840cb59c | 3214 | health_code_update(); |
f37d259d MD |
3215 | return ret; |
3216 | } | |
3217 | ||
5b4a0ec0 DG |
3218 | /* |
3219 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3220 | * |
3221 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3222 | */ |
3223 | void ust_app_clean_list(void) | |
421cb601 | 3224 | { |
5b4a0ec0 | 3225 | int ret; |
659ed79f | 3226 | struct ust_app *app; |
bec39940 | 3227 | struct lttng_ht_iter iter; |
421cb601 | 3228 | |
5b4a0ec0 | 3229 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3230 | |
5b4a0ec0 | 3231 | rcu_read_lock(); |
421cb601 | 3232 | |
659ed79f | 3233 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3234 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3235 | assert(!ret); |
659ed79f | 3236 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3237 | } |
3238 | ||
852d0037 | 3239 | /* Cleanup socket hash table */ |
659ed79f DG |
3240 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3241 | sock_n.node) { | |
852d0037 | 3242 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3243 | assert(!ret); |
3244 | } | |
852d0037 | 3245 | |
d88aee68 DG |
3246 | /* Cleanup notify socket hash table */ |
3247 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3248 | notify_sock_n.node) { | |
3249 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3250 | assert(!ret); | |
3251 | } | |
36b588ed | 3252 | rcu_read_unlock(); |
d88aee68 | 3253 | |
bec39940 | 3254 | /* Destroy is done only when the ht is empty */ |
0b2dc8df MD |
3255 | ht_cleanup_push(ust_app_ht); |
3256 | ht_cleanup_push(ust_app_ht_by_sock); | |
3257 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
5b4a0ec0 DG |
3258 | } |
3259 | ||
3260 | /* | |
3261 | * Init UST app hash table. | |
3262 | */ | |
3263 | void ust_app_ht_alloc(void) | |
3264 | { | |
bec39940 | 3265 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3266 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3267 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3268 | } |
3269 | ||
78f0bacd DG |
3270 | /* |
3271 | * For a specific UST session, disable the channel for all registered apps. | |
3272 | */ | |
35a9059d | 3273 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3274 | struct ltt_ust_channel *uchan) |
3275 | { | |
3276 | int ret = 0; | |
bec39940 DG |
3277 | struct lttng_ht_iter iter; |
3278 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3279 | struct ust_app *app; |
3280 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3281 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3282 | |
3283 | if (usess == NULL || uchan == NULL) { | |
3284 | ERR("Disabling UST global channel with NULL values"); | |
3285 | ret = -1; | |
3286 | goto error; | |
3287 | } | |
3288 | ||
77c5447b | 3289 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3290 | uchan->name, usess->id); |
78f0bacd DG |
3291 | |
3292 | rcu_read_lock(); | |
3293 | ||
3294 | /* For every registered applications */ | |
852d0037 | 3295 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3296 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3297 | if (!app->compatible) { |
3298 | /* | |
3299 | * TODO: In time, we should notice the caller of this error by | |
3300 | * telling him that this is a version error. | |
3301 | */ | |
3302 | continue; | |
3303 | } | |
78f0bacd DG |
3304 | ua_sess = lookup_session_by_app(usess, app); |
3305 | if (ua_sess == NULL) { | |
3306 | continue; | |
3307 | } | |
3308 | ||
8535a6d9 | 3309 | /* Get channel */ |
bec39940 DG |
3310 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3311 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3312 | /* If the session if found for the app, the channel must be there */ |
3313 | assert(ua_chan_node); | |
3314 | ||
3315 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3316 | /* The channel must not be already disabled */ | |
3317 | assert(ua_chan->enabled == 1); | |
3318 | ||
3319 | /* Disable channel onto application */ | |
3320 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3321 | if (ret < 0) { |
3322 | /* XXX: We might want to report this error at some point... */ | |
3323 | continue; | |
3324 | } | |
3325 | } | |
3326 | ||
3327 | rcu_read_unlock(); | |
3328 | ||
3329 | error: | |
3330 | return ret; | |
3331 | } | |
3332 | ||
3333 | /* | |
3334 | * For a specific UST session, enable the channel for all registered apps. | |
3335 | */ | |
35a9059d | 3336 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3337 | struct ltt_ust_channel *uchan) |
3338 | { | |
3339 | int ret = 0; | |
bec39940 | 3340 | struct lttng_ht_iter iter; |
78f0bacd DG |
3341 | struct ust_app *app; |
3342 | struct ust_app_session *ua_sess; | |
3343 | ||
3344 | if (usess == NULL || uchan == NULL) { | |
3345 | ERR("Adding UST global channel to NULL values"); | |
3346 | ret = -1; | |
3347 | goto error; | |
3348 | } | |
3349 | ||
77c5447b | 3350 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3351 | uchan->name, usess->id); |
78f0bacd DG |
3352 | |
3353 | rcu_read_lock(); | |
3354 | ||
3355 | /* For every registered applications */ | |
852d0037 | 3356 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3357 | if (!app->compatible) { |
3358 | /* | |
3359 | * TODO: In time, we should notice the caller of this error by | |
3360 | * telling him that this is a version error. | |
3361 | */ | |
3362 | continue; | |
3363 | } | |
78f0bacd DG |
3364 | ua_sess = lookup_session_by_app(usess, app); |
3365 | if (ua_sess == NULL) { | |
3366 | continue; | |
3367 | } | |
3368 | ||
3369 | /* Enable channel onto application */ | |
3370 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3371 | if (ret < 0) { | |
3372 | /* XXX: We might want to report this error at some point... */ | |
3373 | continue; | |
3374 | } | |
3375 | } | |
3376 | ||
3377 | rcu_read_unlock(); | |
3378 | ||
3379 | error: | |
3380 | return ret; | |
3381 | } | |
3382 | ||
b0a40d28 DG |
3383 | /* |
3384 | * Disable an event in a channel and for a specific session. | |
3385 | */ | |
35a9059d DG |
3386 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3387 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3388 | { |
3389 | int ret = 0; | |
bec39940 DG |
3390 | struct lttng_ht_iter iter, uiter; |
3391 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3392 | struct ust_app *app; |
3393 | struct ust_app_session *ua_sess; | |
3394 | struct ust_app_channel *ua_chan; | |
3395 | struct ust_app_event *ua_event; | |
3396 | ||
3397 | DBG("UST app disabling event %s for all apps in channel " | |
77c5447b MD |
3398 | "%s for session id %" PRIu64, |
3399 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3400 | |
3401 | rcu_read_lock(); | |
3402 | ||
3403 | /* For all registered applications */ | |
852d0037 | 3404 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3405 | if (!app->compatible) { |
3406 | /* | |
3407 | * TODO: In time, we should notice the caller of this error by | |
3408 | * telling him that this is a version error. | |
3409 | */ | |
3410 | continue; | |
3411 | } | |
b0a40d28 DG |
3412 | ua_sess = lookup_session_by_app(usess, app); |
3413 | if (ua_sess == NULL) { | |
3414 | /* Next app */ | |
3415 | continue; | |
3416 | } | |
3417 | ||
3418 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3419 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3420 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3421 | if (ua_chan_node == NULL) { |
77c5447b | 3422 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3423 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3424 | continue; |
3425 | } | |
3426 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3427 | ||
bec39940 DG |
3428 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3429 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3430 | if (ua_event_node == NULL) { |
3431 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3432 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3433 | continue; |
3434 | } | |
3435 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3436 | ||
7f79d3a1 | 3437 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3438 | if (ret < 0) { |
3439 | /* XXX: Report error someday... */ | |
3440 | continue; | |
3441 | } | |
3442 | } | |
3443 | ||
3444 | rcu_read_unlock(); | |
3445 | ||
3446 | return ret; | |
3447 | } | |
3448 | ||
9730260e | 3449 | /* |
edb67388 | 3450 | * For a specific UST session and UST channel, the event for all |
9730260e DG |
3451 | * registered apps. |
3452 | */ | |
35a9059d | 3453 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
9730260e DG |
3454 | struct ltt_ust_channel *uchan) |
3455 | { | |
3456 | int ret = 0; | |
bec39940 DG |
3457 | struct lttng_ht_iter iter, uiter; |
3458 | struct lttng_ht_node_str *ua_chan_node; | |
9730260e DG |
3459 | struct ust_app *app; |
3460 | struct ust_app_session *ua_sess; | |
3461 | struct ust_app_channel *ua_chan; | |
3462 | struct ust_app_event *ua_event; | |
3463 | ||
3464 | DBG("UST app disabling all event for all apps in channel " | |
77c5447b | 3465 | "%s for session id %" PRIu64, uchan->name, usess->id); |
9730260e DG |
3466 | |
3467 | rcu_read_lock(); | |
3468 | ||
3469 | /* For all registered applications */ | |
852d0037 | 3470 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3471 | if (!app->compatible) { |
3472 | /* | |
3473 | * TODO: In time, we should notice the caller of this error by | |
3474 | * telling him that this is a version error. | |
3475 | */ | |
3476 | continue; | |
3477 | } | |
9730260e | 3478 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3479 | if (!ua_sess) { |
3480 | /* The application has problem or is probably dead. */ | |
3481 | continue; | |
3482 | } | |
9730260e DG |
3483 | |
3484 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3485 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3486 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3487 | /* If the channel is not found, there is a code flow error */ |
3488 | assert(ua_chan_node); | |
3489 | ||
9730260e DG |
3490 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3491 | ||
3492 | /* Disable each events of channel */ | |
bec39940 DG |
3493 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3494 | node.node) { | |
7f79d3a1 | 3495 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
9730260e DG |
3496 | if (ret < 0) { |
3497 | /* XXX: Report error someday... */ | |
3498 | continue; | |
3499 | } | |
3500 | } | |
3501 | } | |
3502 | ||
3503 | rcu_read_unlock(); | |
3504 | ||
3505 | return ret; | |
3506 | } | |
3507 | ||
421cb601 | 3508 | /* |
5b4a0ec0 | 3509 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3510 | */ |
35a9059d | 3511 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3512 | struct ltt_ust_channel *uchan) |
3513 | { | |
3d8ca23b | 3514 | int ret = 0, created; |
bec39940 | 3515 | struct lttng_ht_iter iter; |
48842b30 | 3516 | struct ust_app *app; |
3d8ca23b | 3517 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3518 | |
fc34caaa DG |
3519 | /* Very wrong code flow */ |
3520 | assert(usess); | |
3521 | assert(uchan); | |
421cb601 | 3522 | |
77c5447b | 3523 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3524 | uchan->name, usess->id); |
48842b30 DG |
3525 | |
3526 | rcu_read_lock(); | |
421cb601 | 3527 | |
5b4a0ec0 | 3528 | /* For every registered applications */ |
852d0037 | 3529 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3530 | if (!app->compatible) { |
3531 | /* | |
3532 | * TODO: In time, we should notice the caller of this error by | |
3533 | * telling him that this is a version error. | |
3534 | */ | |
3535 | continue; | |
3536 | } | |
edb67388 DG |
3537 | /* |
3538 | * Create session on the tracer side and add it to app session HT. Note | |
3539 | * that if session exist, it will simply return a pointer to the ust | |
3540 | * app session. | |
3541 | */ | |
3d8ca23b DG |
3542 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3543 | if (ret < 0) { | |
3544 | switch (ret) { | |
3545 | case -ENOTCONN: | |
3546 | /* | |
3547 | * The application's socket is not valid. Either a bad socket | |
3548 | * or a timeout on it. We can't inform the caller that for a | |
3549 | * specific app, the session failed so lets continue here. | |
3550 | */ | |
3551 | continue; | |
3552 | case -ENOMEM: | |
3553 | default: | |
3554 | goto error_rcu_unlock; | |
3555 | } | |
48842b30 | 3556 | } |
3d8ca23b | 3557 | assert(ua_sess); |
48842b30 | 3558 | |
d0b96690 | 3559 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3560 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3561 | sizeof(uchan->name))) { | |
3562 | struct ustctl_consumer_channel_attr attr; | |
3563 | copy_channel_attr_to_ustctl(&attr, &uchan->attr); | |
3564 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
3565 | &attr); | |
3566 | } else { | |
3567 | /* Create channel onto application. We don't need the chan ref. */ | |
3568 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3569 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3570 | } | |
d0b96690 | 3571 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3572 | if (ret < 0) { |
3573 | if (ret == -ENOMEM) { | |
3574 | /* No more memory is a fatal error. Stop right now. */ | |
3575 | goto error_rcu_unlock; | |
3576 | } | |
3577 | /* Cleanup the created session if it's the case. */ | |
3578 | if (created) { | |
d0b96690 | 3579 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3580 | } |
48842b30 | 3581 | } |
48842b30 | 3582 | } |
5b4a0ec0 | 3583 | |
95e047ff | 3584 | error_rcu_unlock: |
48842b30 | 3585 | rcu_read_unlock(); |
3c14c33f | 3586 | return ret; |
48842b30 DG |
3587 | } |
3588 | ||
5b4a0ec0 | 3589 | /* |
edb67388 | 3590 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3591 | */ |
35a9059d | 3592 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3593 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3594 | { | |
3595 | int ret = 0; | |
bec39940 | 3596 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3597 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3598 | struct ust_app *app; |
3599 | struct ust_app_session *ua_sess; | |
3600 | struct ust_app_channel *ua_chan; | |
3601 | struct ust_app_event *ua_event; | |
48842b30 | 3602 | |
77c5447b | 3603 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3604 | uevent->attr.name, usess->id); |
48842b30 | 3605 | |
edb67388 DG |
3606 | /* |
3607 | * NOTE: At this point, this function is called only if the session and | |
3608 | * channel passed are already created for all apps. and enabled on the | |
3609 | * tracer also. | |
3610 | */ | |
3611 | ||
48842b30 | 3612 | rcu_read_lock(); |
421cb601 DG |
3613 | |
3614 | /* For all registered applications */ | |
852d0037 | 3615 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3616 | if (!app->compatible) { |
3617 | /* | |
3618 | * TODO: In time, we should notice the caller of this error by | |
3619 | * telling him that this is a version error. | |
3620 | */ | |
3621 | continue; | |
3622 | } | |
edb67388 | 3623 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3624 | if (!ua_sess) { |
3625 | /* The application has problem or is probably dead. */ | |
3626 | continue; | |
3627 | } | |
ba767faf | 3628 | |
d0b96690 DG |
3629 | pthread_mutex_lock(&ua_sess->lock); |
3630 | ||
edb67388 | 3631 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3632 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3633 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3634 | /* If the channel is not found, there is a code flow error */ |
3635 | assert(ua_chan_node); | |
3636 | ||
3637 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3638 | ||
18eace3b DG |
3639 | /* Get event node */ |
3640 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
3641 | uevent->filter, uevent->attr.loglevel); | |
3642 | if (ua_event == NULL) { | |
7f79d3a1 | 3643 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3644 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3645 | goto next_app; |
35a9059d | 3646 | } |
35a9059d DG |
3647 | |
3648 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3649 | if (ret < 0) { | |
d0b96690 | 3650 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3651 | goto error; |
48842b30 | 3652 | } |
d0b96690 DG |
3653 | next_app: |
3654 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3655 | } |
3656 | ||
7f79d3a1 | 3657 | error: |
edb67388 | 3658 | rcu_read_unlock(); |
edb67388 DG |
3659 | return ret; |
3660 | } | |
3661 | ||
3662 | /* | |
3663 | * For a specific existing UST session and UST channel, creates the event for | |
3664 | * all registered apps. | |
3665 | */ | |
35a9059d | 3666 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3667 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3668 | { | |
3669 | int ret = 0; | |
bec39940 DG |
3670 | struct lttng_ht_iter iter, uiter; |
3671 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3672 | struct ust_app *app; |
3673 | struct ust_app_session *ua_sess; | |
3674 | struct ust_app_channel *ua_chan; | |
3675 | ||
77c5447b | 3676 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3677 | uevent->attr.name, usess->id); |
edb67388 | 3678 | |
edb67388 DG |
3679 | rcu_read_lock(); |
3680 | ||
3681 | /* For all registered applications */ | |
852d0037 | 3682 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3683 | if (!app->compatible) { |
3684 | /* | |
3685 | * TODO: In time, we should notice the caller of this error by | |
3686 | * telling him that this is a version error. | |
3687 | */ | |
3688 | continue; | |
3689 | } | |
edb67388 | 3690 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3691 | if (!ua_sess) { |
3692 | /* The application has problem or is probably dead. */ | |
3693 | continue; | |
3694 | } | |
48842b30 | 3695 | |
d0b96690 | 3696 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3697 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3698 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3699 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3700 | /* If the channel is not found, there is a code flow error */ |
3701 | assert(ua_chan_node); | |
3702 | ||
48842b30 DG |
3703 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3704 | ||
edb67388 | 3705 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3706 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3707 | if (ret < 0) { |
49c336c1 | 3708 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3709 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3710 | break; | |
3711 | } | |
3712 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3713 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3714 | continue; |
48842b30 | 3715 | } |
48842b30 | 3716 | } |
5b4a0ec0 | 3717 | |
48842b30 DG |
3718 | rcu_read_unlock(); |
3719 | ||
3720 | return ret; | |
3721 | } | |
3722 | ||
5b4a0ec0 DG |
3723 | /* |
3724 | * Start tracing for a specific UST session and app. | |
3725 | */ | |
b34cbebf | 3726 | static |
421cb601 | 3727 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3728 | { |
3729 | int ret = 0; | |
48842b30 | 3730 | struct ust_app_session *ua_sess; |
48842b30 | 3731 | |
852d0037 | 3732 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3733 | |
509cbaf8 MD |
3734 | rcu_read_lock(); |
3735 | ||
e0c7ec2b DG |
3736 | if (!app->compatible) { |
3737 | goto end; | |
3738 | } | |
3739 | ||
421cb601 DG |
3740 | ua_sess = lookup_session_by_app(usess, app); |
3741 | if (ua_sess == NULL) { | |
d42f20df DG |
3742 | /* The session is in teardown process. Ignore and continue. */ |
3743 | goto end; | |
421cb601 | 3744 | } |
48842b30 | 3745 | |
d0b96690 DG |
3746 | pthread_mutex_lock(&ua_sess->lock); |
3747 | ||
aea829b3 DG |
3748 | /* Upon restart, we skip the setup, already done */ |
3749 | if (ua_sess->started) { | |
8be98f9a | 3750 | goto skip_setup; |
aea829b3 | 3751 | } |
8be98f9a | 3752 | |
a4b92340 DG |
3753 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3754 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3755 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3756 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3757 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3758 | if (ret < 0) { |
3759 | if (ret != -EEXIST) { | |
3760 | ERR("Trace directory creation error"); | |
d0b96690 | 3761 | goto error_unlock; |
421cb601 | 3762 | } |
173af62f | 3763 | } |
7753dea8 | 3764 | } |
aea829b3 | 3765 | |
d65d2de8 DG |
3766 | /* |
3767 | * Create the metadata for the application. This returns gracefully if a | |
3768 | * metadata was already set for the session. | |
3769 | */ | |
3770 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, NULL); | |
421cb601 | 3771 | if (ret < 0) { |
d0b96690 | 3772 | goto error_unlock; |
421cb601 | 3773 | } |
48842b30 | 3774 | |
840cb59c | 3775 | health_code_update(); |
86acf0da | 3776 | |
8be98f9a | 3777 | skip_setup: |
421cb601 | 3778 | /* This start the UST tracing */ |
852d0037 | 3779 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3780 | if (ret < 0) { |
ffe60014 DG |
3781 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3782 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3783 | app->pid, ret); | |
3784 | } else { | |
3785 | DBG("UST app start session failed. Application is dead."); | |
47cb9d4a DG |
3786 | /* |
3787 | * This is normal behavior, an application can die during the | |
3788 | * creation process. Don't report an error so the execution can | |
3789 | * continue normally. | |
3790 | */ | |
3791 | pthread_mutex_unlock(&ua_sess->lock); | |
3792 | goto end; | |
ffe60014 | 3793 | } |
d0b96690 | 3794 | goto error_unlock; |
421cb601 | 3795 | } |
5b4a0ec0 | 3796 | |
55c3953d DG |
3797 | /* Indicate that the session has been started once */ |
3798 | ua_sess->started = 1; | |
3799 | ||
d0b96690 DG |
3800 | pthread_mutex_unlock(&ua_sess->lock); |
3801 | ||
840cb59c | 3802 | health_code_update(); |
86acf0da | 3803 | |
421cb601 | 3804 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3805 | ret = ustctl_wait_quiescent(app->sock); |
3806 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3807 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3808 | app->pid, ret); | |
3809 | } | |
48842b30 | 3810 | |
e0c7ec2b DG |
3811 | end: |
3812 | rcu_read_unlock(); | |
840cb59c | 3813 | health_code_update(); |
421cb601 | 3814 | return 0; |
48842b30 | 3815 | |
d0b96690 DG |
3816 | error_unlock: |
3817 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3818 | rcu_read_unlock(); |
840cb59c | 3819 | health_code_update(); |
421cb601 DG |
3820 | return -1; |
3821 | } | |
48842b30 | 3822 | |
8be98f9a MD |
3823 | /* |
3824 | * Stop tracing for a specific UST session and app. | |
3825 | */ | |
b34cbebf | 3826 | static |
8be98f9a MD |
3827 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3828 | { | |
3829 | int ret = 0; | |
3830 | struct ust_app_session *ua_sess; | |
7972aab2 | 3831 | struct ust_registry_session *registry; |
8be98f9a | 3832 | |
852d0037 | 3833 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3834 | |
3835 | rcu_read_lock(); | |
3836 | ||
e0c7ec2b | 3837 | if (!app->compatible) { |
d88aee68 | 3838 | goto end_no_session; |
e0c7ec2b DG |
3839 | } |
3840 | ||
8be98f9a MD |
3841 | ua_sess = lookup_session_by_app(usess, app); |
3842 | if (ua_sess == NULL) { | |
d88aee68 | 3843 | goto end_no_session; |
8be98f9a MD |
3844 | } |
3845 | ||
d88aee68 DG |
3846 | pthread_mutex_lock(&ua_sess->lock); |
3847 | ||
9bc07046 DG |
3848 | /* |
3849 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3850 | * that was never started. It's possible since we can have a fail start |
3851 | * from either the application manager thread or the command thread. Simply | |
3852 | * indicate that this is a stop error. | |
9bc07046 | 3853 | */ |
f9dfc3d9 | 3854 | if (!ua_sess->started) { |
c45536e1 DG |
3855 | goto error_rcu_unlock; |
3856 | } | |
7db205b5 | 3857 | |
840cb59c | 3858 | health_code_update(); |
86acf0da | 3859 | |
9d6c7d3f | 3860 | /* This inhibits UST tracing */ |
852d0037 | 3861 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3862 | if (ret < 0) { |
ffe60014 DG |
3863 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3864 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3865 | app->pid, ret); | |
3866 | } else { | |
3867 | DBG("UST app stop session failed. Application is dead."); | |
47cb9d4a DG |
3868 | /* |
3869 | * This is normal behavior, an application can die during the | |
3870 | * creation process. Don't report an error so the execution can | |
3871 | * continue normally. | |
3872 | */ | |
3873 | goto end_unlock; | |
ffe60014 | 3874 | } |
9d6c7d3f DG |
3875 | goto error_rcu_unlock; |
3876 | } | |
3877 | ||
840cb59c | 3878 | health_code_update(); |
86acf0da | 3879 | |
9d6c7d3f | 3880 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3881 | ret = ustctl_wait_quiescent(app->sock); |
3882 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3883 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3884 | app->pid, ret); | |
3885 | } | |
9d6c7d3f | 3886 | |
840cb59c | 3887 | health_code_update(); |
86acf0da | 3888 | |
b34cbebf MD |
3889 | registry = get_session_registry(ua_sess); |
3890 | assert(registry); | |
1b532a60 DG |
3891 | |
3892 | if (!registry->metadata_closed) { | |
3893 | /* Push metadata for application before freeing the application. */ | |
3894 | (void) push_metadata(registry, ua_sess->consumer); | |
3895 | } | |
b34cbebf | 3896 | |
47cb9d4a | 3897 | end_unlock: |
b34cbebf MD |
3898 | pthread_mutex_unlock(&ua_sess->lock); |
3899 | end_no_session: | |
3900 | rcu_read_unlock(); | |
3901 | health_code_update(); | |
3902 | return 0; | |
3903 | ||
3904 | error_rcu_unlock: | |
3905 | pthread_mutex_unlock(&ua_sess->lock); | |
3906 | rcu_read_unlock(); | |
3907 | health_code_update(); | |
3908 | return -1; | |
3909 | } | |
3910 | ||
3911 | /* | |
3912 | * Flush buffers for a specific UST session and app. | |
3913 | */ | |
3914 | static | |
3915 | int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
3916 | { | |
3917 | int ret = 0; | |
3918 | struct lttng_ht_iter iter; | |
3919 | struct ust_app_session *ua_sess; | |
3920 | struct ust_app_channel *ua_chan; | |
3921 | ||
3922 | DBG("Flushing buffers for ust app pid %d", app->pid); | |
3923 | ||
3924 | rcu_read_lock(); | |
3925 | ||
3926 | if (!app->compatible) { | |
3927 | goto end_no_session; | |
3928 | } | |
3929 | ||
3930 | ua_sess = lookup_session_by_app(usess, app); | |
3931 | if (ua_sess == NULL) { | |
3932 | goto end_no_session; | |
3933 | } | |
3934 | ||
3935 | pthread_mutex_lock(&ua_sess->lock); | |
3936 | ||
3937 | health_code_update(); | |
3938 | ||
9d6c7d3f | 3939 | /* Flushing buffers */ |
bec39940 DG |
3940 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
3941 | node.node) { | |
840cb59c | 3942 | health_code_update(); |
ffe60014 | 3943 | assert(ua_chan->is_sent); |
852d0037 | 3944 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 3945 | if (ret < 0) { |
ffe60014 DG |
3946 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3947 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
3948 | app->pid, ua_chan->name, ret); | |
3949 | } else { | |
3950 | DBG3("UST app failed to flush %s. Application is dead.", | |
3951 | ua_chan->name); | |
47cb9d4a DG |
3952 | /* |
3953 | * This is normal behavior, an application can die during the | |
3954 | * creation process. Don't report an error so the execution can | |
3955 | * continue normally. | |
3956 | */ | |
ffe60014 | 3957 | } |
6d3686da DG |
3958 | /* Continuing flushing all buffers */ |
3959 | continue; | |
8be98f9a MD |
3960 | } |
3961 | } | |
8be98f9a | 3962 | |
840cb59c | 3963 | health_code_update(); |
86acf0da | 3964 | |
d88aee68 DG |
3965 | pthread_mutex_unlock(&ua_sess->lock); |
3966 | end_no_session: | |
7db205b5 | 3967 | rcu_read_unlock(); |
840cb59c | 3968 | health_code_update(); |
8be98f9a | 3969 | return 0; |
8be98f9a MD |
3970 | } |
3971 | ||
84cd17c6 MD |
3972 | /* |
3973 | * Destroy a specific UST session in apps. | |
3974 | */ | |
3353de95 | 3975 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 3976 | { |
ffe60014 | 3977 | int ret; |
84cd17c6 | 3978 | struct ust_app_session *ua_sess; |
bec39940 | 3979 | struct lttng_ht_iter iter; |
77c5447b | 3980 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 3981 | |
852d0037 | 3982 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
3983 | |
3984 | rcu_read_lock(); | |
3985 | ||
e0c7ec2b DG |
3986 | if (!app->compatible) { |
3987 | goto end; | |
3988 | } | |
3989 | ||
84cd17c6 | 3990 | __lookup_session_by_app(usess, app, &iter); |
77c5447b | 3991 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 3992 | if (node == NULL) { |
d42f20df DG |
3993 | /* Session is being or is deleted. */ |
3994 | goto end; | |
84cd17c6 MD |
3995 | } |
3996 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 3997 | |
840cb59c | 3998 | health_code_update(); |
d0b96690 | 3999 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4000 | |
840cb59c | 4001 | health_code_update(); |
7db205b5 | 4002 | |
84cd17c6 | 4003 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4004 | ret = ustctl_wait_quiescent(app->sock); |
4005 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4006 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4007 | app->pid, ret); | |
4008 | } | |
e0c7ec2b DG |
4009 | end: |
4010 | rcu_read_unlock(); | |
840cb59c | 4011 | health_code_update(); |
84cd17c6 | 4012 | return 0; |
84cd17c6 MD |
4013 | } |
4014 | ||
5b4a0ec0 DG |
4015 | /* |
4016 | * Start tracing for the UST session. | |
4017 | */ | |
421cb601 DG |
4018 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4019 | { | |
4020 | int ret = 0; | |
bec39940 | 4021 | struct lttng_ht_iter iter; |
421cb601 | 4022 | struct ust_app *app; |
48842b30 | 4023 | |
421cb601 DG |
4024 | DBG("Starting all UST traces"); |
4025 | ||
4026 | rcu_read_lock(); | |
421cb601 | 4027 | |
852d0037 | 4028 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4029 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4030 | if (ret < 0) { |
5b4a0ec0 DG |
4031 | /* Continue to next apps even on error */ |
4032 | continue; | |
48842b30 | 4033 | } |
48842b30 | 4034 | } |
5b4a0ec0 | 4035 | |
48842b30 DG |
4036 | rcu_read_unlock(); |
4037 | ||
4038 | return 0; | |
4039 | } | |
487cf67c | 4040 | |
8be98f9a MD |
4041 | /* |
4042 | * Start tracing for the UST session. | |
4043 | */ | |
4044 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4045 | { | |
4046 | int ret = 0; | |
bec39940 | 4047 | struct lttng_ht_iter iter; |
8be98f9a MD |
4048 | struct ust_app *app; |
4049 | ||
4050 | DBG("Stopping all UST traces"); | |
4051 | ||
4052 | rcu_read_lock(); | |
4053 | ||
b34cbebf MD |
4054 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4055 | ret = ust_app_stop_trace(usess, app); | |
4056 | if (ret < 0) { | |
4057 | /* Continue to next apps even on error */ | |
4058 | continue; | |
4059 | } | |
4060 | } | |
4061 | ||
5e674ece | 4062 | /* Flush buffers and push metadata (for UID buffers). */ |
b34cbebf MD |
4063 | switch (usess->buffer_type) { |
4064 | case LTTNG_BUFFER_PER_UID: | |
4065 | { | |
7972aab2 | 4066 | struct buffer_reg_uid *reg; |
b34cbebf MD |
4067 | |
4068 | /* Flush all per UID buffers associated to that session. */ | |
7972aab2 | 4069 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5e674ece | 4070 | struct ust_registry_session *ust_session_reg; |
7972aab2 DG |
4071 | struct buffer_reg_channel *reg_chan; |
4072 | struct consumer_socket *socket; | |
4073 | ||
4074 | /* Get consumer socket to use to push the metadata.*/ | |
4075 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4076 | usess->consumer); | |
4077 | if (!socket) { | |
4078 | /* Ignore request if no consumer is found for the session. */ | |
4079 | continue; | |
4080 | } | |
4081 | ||
4082 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4083 | reg_chan, node.node) { | |
4084 | /* | |
4085 | * The following call will print error values so the return | |
4086 | * code is of little importance because whatever happens, we | |
4087 | * have to try them all. | |
4088 | */ | |
4089 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4090 | } | |
5e674ece MD |
4091 | |
4092 | ust_session_reg = reg->registry->reg.ust; | |
4093 | if (!ust_session_reg->metadata_closed) { | |
4094 | /* Push metadata. */ | |
4095 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4096 | } | |
7972aab2 | 4097 | } |
5e674ece | 4098 | |
b34cbebf | 4099 | break; |
7972aab2 | 4100 | } |
b34cbebf MD |
4101 | case LTTNG_BUFFER_PER_PID: |
4102 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4103 | ret = ust_app_flush_trace(usess, app); | |
4104 | if (ret < 0) { | |
4105 | /* Continue to next apps even on error */ | |
4106 | continue; | |
4107 | } | |
8be98f9a | 4108 | } |
b34cbebf MD |
4109 | break; |
4110 | default: | |
4111 | assert(0); | |
4112 | break; | |
8be98f9a MD |
4113 | } |
4114 | ||
4115 | rcu_read_unlock(); | |
4116 | ||
4117 | return 0; | |
4118 | } | |
4119 | ||
84cd17c6 MD |
4120 | /* |
4121 | * Destroy app UST session. | |
4122 | */ | |
4123 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4124 | { | |
4125 | int ret = 0; | |
bec39940 | 4126 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4127 | struct ust_app *app; |
4128 | ||
4129 | DBG("Destroy all UST traces"); | |
4130 | ||
4131 | rcu_read_lock(); | |
4132 | ||
852d0037 | 4133 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4134 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4135 | if (ret < 0) { |
4136 | /* Continue to next apps even on error */ | |
4137 | continue; | |
4138 | } | |
4139 | } | |
4140 | ||
4141 | rcu_read_unlock(); | |
4142 | ||
4143 | return 0; | |
4144 | } | |
4145 | ||
5b4a0ec0 DG |
4146 | /* |
4147 | * Add channels/events from UST global domain to registered apps at sock. | |
4148 | */ | |
487cf67c DG |
4149 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4150 | { | |
55c54cce | 4151 | int ret = 0; |
4623416f | 4152 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4153 | struct ust_app *app; |
3d8ca23b | 4154 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4155 | struct ust_app_channel *ua_chan; |
4156 | struct ust_app_event *ua_event; | |
727d5404 | 4157 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4158 | |
95e047ff | 4159 | assert(usess); |
ffe60014 | 4160 | assert(sock >= 0); |
1f3580c7 | 4161 | |
77c5447b | 4162 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4163 | usess->id); |
487cf67c | 4164 | |
284d8f55 DG |
4165 | rcu_read_lock(); |
4166 | ||
487cf67c DG |
4167 | app = find_app_by_sock(sock); |
4168 | if (app == NULL) { | |
d88aee68 DG |
4169 | /* |
4170 | * Application can be unregistered before so this is possible hence | |
4171 | * simply stopping the update. | |
4172 | */ | |
4173 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4174 | goto error; |
4175 | } | |
4176 | ||
e0c7ec2b DG |
4177 | if (!app->compatible) { |
4178 | goto error; | |
4179 | } | |
4180 | ||
3d8ca23b DG |
4181 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4182 | if (ret < 0) { | |
4183 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4184 | goto error; |
4185 | } | |
3d8ca23b | 4186 | assert(ua_sess); |
487cf67c | 4187 | |
d0b96690 DG |
4188 | pthread_mutex_lock(&ua_sess->lock); |
4189 | ||
284d8f55 | 4190 | /* |
d0b96690 | 4191 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4192 | * app session above made a shadow copy of the UST global domain from the |
4193 | * ltt ust session. | |
4194 | */ | |
bec39940 DG |
4195 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4196 | node.node) { | |
d65d2de8 DG |
4197 | /* |
4198 | * For a metadata channel, handle it differently. | |
4199 | */ | |
4200 | if (!strncmp(ua_chan->name, DEFAULT_METADATA_NAME, | |
4201 | sizeof(ua_chan->name))) { | |
4202 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
4203 | &ua_chan->attr); | |
c7a339aa DG |
4204 | if (ret < 0) { |
4205 | goto error_unlock; | |
4206 | } | |
d65d2de8 DG |
4207 | /* Remove it from the hash table and continue!. */ |
4208 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
4209 | assert(!ret); | |
4210 | delete_ust_app_channel(-1, ua_chan, app); | |
4211 | continue; | |
4212 | } else { | |
4213 | ret = do_create_channel(app, usess, ua_sess, ua_chan); | |
c7a339aa DG |
4214 | if (ret < 0) { |
4215 | /* | |
4216 | * Stop everything. On error, the application failed, no more | |
4217 | * file descriptor are available or ENOMEM so stopping here is | |
4218 | * the only thing we can do for now. | |
4219 | */ | |
4220 | goto error_unlock; | |
4221 | } | |
487cf67c DG |
4222 | } |
4223 | ||
4623416f DG |
4224 | /* |
4225 | * Add context using the list so they are enabled in the same order the | |
4226 | * user added them. | |
4227 | */ | |
4228 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4229 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4230 | if (ret < 0) { | |
d0b96690 | 4231 | goto error_unlock; |
727d5404 DG |
4232 | } |
4233 | } | |
4234 | ||
4235 | ||
284d8f55 | 4236 | /* For each events */ |
bec39940 DG |
4237 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4238 | node.node) { | |
284d8f55 DG |
4239 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4240 | if (ret < 0) { | |
d0b96690 | 4241 | goto error_unlock; |
487cf67c | 4242 | } |
36dc12cc | 4243 | } |
487cf67c DG |
4244 | } |
4245 | ||
d0b96690 DG |
4246 | pthread_mutex_unlock(&ua_sess->lock); |
4247 | ||
36dc12cc | 4248 | if (usess->start_trace) { |
421cb601 | 4249 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4250 | if (ret < 0) { |
36dc12cc DG |
4251 | goto error; |
4252 | } | |
4253 | ||
852d0037 | 4254 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4255 | } |
4256 | ||
ffe60014 DG |
4257 | /* Everything went well at this point. */ |
4258 | rcu_read_unlock(); | |
4259 | return; | |
4260 | ||
d0b96690 DG |
4261 | error_unlock: |
4262 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4263 | error: |
ffe60014 | 4264 | if (ua_sess) { |
d0b96690 | 4265 | destroy_app_session(app, ua_sess); |
ffe60014 | 4266 | } |
487cf67c DG |
4267 | rcu_read_unlock(); |
4268 | return; | |
4269 | } | |
55cc08a6 DG |
4270 | |
4271 | /* | |
4272 | * Add context to a specific channel for global UST domain. | |
4273 | */ | |
4274 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4275 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4276 | { | |
4277 | int ret = 0; | |
bec39940 DG |
4278 | struct lttng_ht_node_str *ua_chan_node; |
4279 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4280 | struct ust_app_channel *ua_chan = NULL; |
4281 | struct ust_app_session *ua_sess; | |
4282 | struct ust_app *app; | |
4283 | ||
4284 | rcu_read_lock(); | |
4285 | ||
852d0037 | 4286 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4287 | if (!app->compatible) { |
4288 | /* | |
4289 | * TODO: In time, we should notice the caller of this error by | |
4290 | * telling him that this is a version error. | |
4291 | */ | |
4292 | continue; | |
4293 | } | |
55cc08a6 DG |
4294 | ua_sess = lookup_session_by_app(usess, app); |
4295 | if (ua_sess == NULL) { | |
4296 | continue; | |
4297 | } | |
4298 | ||
d0b96690 | 4299 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4300 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4301 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4302 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4303 | if (ua_chan_node == NULL) { |
d0b96690 | 4304 | goto next_app; |
55cc08a6 DG |
4305 | } |
4306 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4307 | node); | |
55cc08a6 DG |
4308 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4309 | if (ret < 0) { | |
d0b96690 | 4310 | goto next_app; |
55cc08a6 | 4311 | } |
d0b96690 DG |
4312 | next_app: |
4313 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4314 | } |
4315 | ||
55cc08a6 DG |
4316 | rcu_read_unlock(); |
4317 | return ret; | |
4318 | } | |
4319 | ||
76d45b40 DG |
4320 | /* |
4321 | * Enable event for a channel from a UST session for a specific PID. | |
4322 | */ | |
4323 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4324 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4325 | { | |
4326 | int ret = 0; | |
bec39940 | 4327 | struct lttng_ht_iter iter; |
18eace3b | 4328 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4329 | struct ust_app *app; |
4330 | struct ust_app_session *ua_sess; | |
4331 | struct ust_app_channel *ua_chan; | |
4332 | struct ust_app_event *ua_event; | |
4333 | ||
4334 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4335 | ||
4336 | rcu_read_lock(); | |
4337 | ||
4338 | app = ust_app_find_by_pid(pid); | |
4339 | if (app == NULL) { | |
4340 | ERR("UST app enable event per PID %d not found", pid); | |
4341 | ret = -1; | |
d0b96690 | 4342 | goto end; |
76d45b40 DG |
4343 | } |
4344 | ||
e0c7ec2b DG |
4345 | if (!app->compatible) { |
4346 | ret = 0; | |
d0b96690 | 4347 | goto end; |
e0c7ec2b DG |
4348 | } |
4349 | ||
76d45b40 | 4350 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4351 | if (!ua_sess) { |
4352 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4353 | ret = 0; |
4354 | goto end; | |
c4a1715b | 4355 | } |
76d45b40 | 4356 | |
d0b96690 | 4357 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4358 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4359 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4360 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4361 | /* If the channel is not found, there is a code flow error */ |
4362 | assert(ua_chan_node); | |
4363 | ||
4364 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4365 | ||
18eace3b DG |
4366 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4367 | uevent->filter, uevent->attr.loglevel); | |
4368 | if (ua_event == NULL) { | |
76d45b40 DG |
4369 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4370 | if (ret < 0) { | |
d0b96690 | 4371 | goto end_unlock; |
76d45b40 DG |
4372 | } |
4373 | } else { | |
76d45b40 DG |
4374 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4375 | if (ret < 0) { | |
d0b96690 | 4376 | goto end_unlock; |
76d45b40 DG |
4377 | } |
4378 | } | |
4379 | ||
d0b96690 DG |
4380 | end_unlock: |
4381 | pthread_mutex_unlock(&ua_sess->lock); | |
4382 | end: | |
76d45b40 DG |
4383 | rcu_read_unlock(); |
4384 | return ret; | |
4385 | } | |
7f79d3a1 DG |
4386 | |
4387 | /* | |
4388 | * Disable event for a channel from a UST session for a specific PID. | |
4389 | */ | |
4390 | int ust_app_disable_event_pid(struct ltt_ust_session *usess, | |
4391 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4392 | { | |
4393 | int ret = 0; | |
bec39940 DG |
4394 | struct lttng_ht_iter iter; |
4395 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
7f79d3a1 DG |
4396 | struct ust_app *app; |
4397 | struct ust_app_session *ua_sess; | |
4398 | struct ust_app_channel *ua_chan; | |
4399 | struct ust_app_event *ua_event; | |
4400 | ||
4401 | DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); | |
4402 | ||
4403 | rcu_read_lock(); | |
4404 | ||
4405 | app = ust_app_find_by_pid(pid); | |
4406 | if (app == NULL) { | |
4407 | ERR("UST app disable event per PID %d not found", pid); | |
4408 | ret = -1; | |
4409 | goto error; | |
4410 | } | |
4411 | ||
e0c7ec2b DG |
4412 | if (!app->compatible) { |
4413 | ret = 0; | |
4414 | goto error; | |
4415 | } | |
4416 | ||
7f79d3a1 | 4417 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4418 | if (!ua_sess) { |
4419 | /* The application has problem or is probably dead. */ | |
4420 | goto error; | |
4421 | } | |
7f79d3a1 DG |
4422 | |
4423 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4424 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4425 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4426 | if (ua_chan_node == NULL) { |
4427 | /* Channel does not exist, skip disabling */ | |
4428 | goto error; | |
4429 | } | |
4430 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4431 | ||
bec39940 DG |
4432 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); |
4433 | ua_event_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4434 | if (ua_event_node == NULL) { |
4435 | /* Event does not exist, skip disabling */ | |
4436 | goto error; | |
4437 | } | |
4438 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
4439 | ||
4440 | ret = disable_ust_app_event(ua_sess, ua_event, app); | |
4441 | if (ret < 0) { | |
4442 | goto error; | |
4443 | } | |
4444 | ||
4445 | error: | |
4446 | rcu_read_unlock(); | |
4447 | return ret; | |
4448 | } | |
e0c7ec2b | 4449 | |
4466912f DG |
4450 | /* |
4451 | * Calibrate registered applications. | |
4452 | */ | |
4453 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4454 | { | |
4455 | int ret = 0; | |
4456 | struct lttng_ht_iter iter; | |
4457 | struct ust_app *app; | |
4458 | ||
4459 | rcu_read_lock(); | |
4460 | ||
852d0037 | 4461 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4462 | if (!app->compatible) { |
4463 | /* | |
4464 | * TODO: In time, we should notice the caller of this error by | |
4465 | * telling him that this is a version error. | |
4466 | */ | |
4467 | continue; | |
4468 | } | |
4469 | ||
840cb59c | 4470 | health_code_update(); |
86acf0da | 4471 | |
852d0037 | 4472 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4473 | if (ret < 0) { |
4474 | switch (ret) { | |
4475 | case -ENOSYS: | |
4476 | /* Means that it's not implemented on the tracer side. */ | |
4477 | ret = 0; | |
4478 | break; | |
4479 | default: | |
4466912f | 4480 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4481 | app->pid, ret); |
4466912f DG |
4482 | break; |
4483 | } | |
4484 | } | |
4485 | } | |
4486 | ||
4487 | DBG("UST app global domain calibration finished"); | |
4488 | ||
4489 | rcu_read_unlock(); | |
4490 | ||
840cb59c | 4491 | health_code_update(); |
86acf0da | 4492 | |
4466912f DG |
4493 | return ret; |
4494 | } | |
d0b96690 DG |
4495 | |
4496 | /* | |
4497 | * Receive registration and populate the given msg structure. | |
4498 | * | |
4499 | * On success return 0 else a negative value returned by the ustctl call. | |
4500 | */ | |
4501 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4502 | { | |
4503 | int ret; | |
4504 | uint32_t pid, ppid, uid, gid; | |
4505 | ||
4506 | assert(msg); | |
4507 | ||
4508 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4509 | &pid, &ppid, &uid, &gid, | |
4510 | &msg->bits_per_long, | |
4511 | &msg->uint8_t_alignment, | |
4512 | &msg->uint16_t_alignment, | |
4513 | &msg->uint32_t_alignment, | |
4514 | &msg->uint64_t_alignment, | |
4515 | &msg->long_alignment, | |
4516 | &msg->byte_order, | |
4517 | msg->name); | |
4518 | if (ret < 0) { | |
4519 | switch (-ret) { | |
4520 | case EPIPE: | |
4521 | case ECONNRESET: | |
4522 | case LTTNG_UST_ERR_EXITING: | |
4523 | DBG3("UST app recv reg message failed. Application died"); | |
4524 | break; | |
4525 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4526 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4527 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4528 | LTTNG_UST_ABI_MINOR_VERSION); | |
4529 | break; | |
4530 | default: | |
4531 | ERR("UST app recv reg message failed with ret %d", ret); | |
4532 | break; | |
4533 | } | |
4534 | goto error; | |
4535 | } | |
4536 | msg->pid = (pid_t) pid; | |
4537 | msg->ppid = (pid_t) ppid; | |
4538 | msg->uid = (uid_t) uid; | |
4539 | msg->gid = (gid_t) gid; | |
4540 | ||
4541 | error: | |
4542 | return ret; | |
4543 | } | |
4544 | ||
d88aee68 DG |
4545 | /* |
4546 | * Return a ust app channel object using the application object and the channel | |
4547 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4548 | * lock MUST be acquired before calling this function. | |
4549 | */ | |
d0b96690 DG |
4550 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4551 | int objd) | |
4552 | { | |
4553 | struct lttng_ht_node_ulong *node; | |
4554 | struct lttng_ht_iter iter; | |
4555 | struct ust_app_channel *ua_chan = NULL; | |
4556 | ||
4557 | assert(app); | |
4558 | ||
4559 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4560 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4561 | if (node == NULL) { | |
4562 | DBG2("UST app channel find by objd %d not found", objd); | |
4563 | goto error; | |
4564 | } | |
4565 | ||
4566 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4567 | ||
4568 | error: | |
4569 | return ua_chan; | |
4570 | } | |
4571 | ||
d88aee68 DG |
4572 | /* |
4573 | * Reply to a register channel notification from an application on the notify | |
4574 | * socket. The channel metadata is also created. | |
4575 | * | |
4576 | * The session UST registry lock is acquired in this function. | |
4577 | * | |
4578 | * On success 0 is returned else a negative value. | |
4579 | */ | |
d0b96690 DG |
4580 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4581 | size_t nr_fields, struct ustctl_field *fields) | |
4582 | { | |
4583 | int ret, ret_code = 0; | |
4584 | uint32_t chan_id, reg_count; | |
7972aab2 | 4585 | uint64_t chan_reg_key; |
d0b96690 DG |
4586 | enum ustctl_channel_header type; |
4587 | struct ust_app *app; | |
4588 | struct ust_app_channel *ua_chan; | |
4589 | struct ust_app_session *ua_sess; | |
7972aab2 | 4590 | struct ust_registry_session *registry; |
45893984 | 4591 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4592 | |
4593 | rcu_read_lock(); | |
4594 | ||
4595 | /* Lookup application. If not found, there is a code flow error. */ | |
4596 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4597 | if (!app) { |
4598 | DBG("Application socket %d is being teardown. Abort event notify", | |
4599 | sock); | |
4600 | ret = 0; | |
d5d629b5 | 4601 | free(fields); |
d88aee68 DG |
4602 | goto error_rcu_unlock; |
4603 | } | |
d0b96690 | 4604 | |
4950b860 | 4605 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4606 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4607 | if (!ua_chan) { |
4608 | DBG("Application channel is being teardown. Abort event notify"); | |
4609 | ret = 0; | |
d5d629b5 | 4610 | free(fields); |
4950b860 MD |
4611 | goto error_rcu_unlock; |
4612 | } | |
4613 | ||
d0b96690 DG |
4614 | assert(ua_chan->session); |
4615 | ua_sess = ua_chan->session; | |
d0b96690 | 4616 | |
7972aab2 DG |
4617 | /* Get right session registry depending on the session buffer type. */ |
4618 | registry = get_session_registry(ua_sess); | |
4619 | assert(registry); | |
45893984 | 4620 | |
7972aab2 DG |
4621 | /* Depending on the buffer type, a different channel key is used. */ |
4622 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4623 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4624 | } else { |
7972aab2 | 4625 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4626 | } |
4627 | ||
7972aab2 DG |
4628 | pthread_mutex_lock(®istry->lock); |
4629 | ||
4630 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4631 | assert(chan_reg); | |
4632 | ||
4633 | if (!chan_reg->register_done) { | |
4634 | reg_count = ust_registry_get_event_count(chan_reg); | |
4635 | if (reg_count < 31) { | |
4636 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4637 | } else { | |
4638 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4639 | } | |
4640 | ||
4641 | chan_reg->nr_ctx_fields = nr_fields; | |
4642 | chan_reg->ctx_fields = fields; | |
4643 | chan_reg->header_type = type; | |
d0b96690 | 4644 | } else { |
7972aab2 DG |
4645 | /* Get current already assigned values. */ |
4646 | type = chan_reg->header_type; | |
d5d629b5 DG |
4647 | free(fields); |
4648 | /* Set to NULL so the error path does not do a double free. */ | |
4649 | fields = NULL; | |
d0b96690 | 4650 | } |
7972aab2 DG |
4651 | /* Channel id is set during the object creation. */ |
4652 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4653 | |
4654 | /* Append to metadata */ | |
7972aab2 DG |
4655 | if (!chan_reg->metadata_dumped) { |
4656 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4657 | if (ret_code) { |
4658 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4659 | goto reply; | |
4660 | } | |
4661 | } | |
4662 | ||
4663 | reply: | |
7972aab2 DG |
4664 | DBG3("UST app replying to register channel key %" PRIu64 |
4665 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4666 | ret_code); | |
d0b96690 DG |
4667 | |
4668 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4669 | if (ret < 0) { | |
4670 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4671 | ERR("UST app reply channel failed with ret %d", ret); | |
4672 | } else { | |
4673 | DBG3("UST app reply channel failed. Application died"); | |
4674 | } | |
4675 | goto error; | |
4676 | } | |
4677 | ||
7972aab2 DG |
4678 | /* This channel registry registration is completed. */ |
4679 | chan_reg->register_done = 1; | |
4680 | ||
d0b96690 | 4681 | error: |
7972aab2 | 4682 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4683 | error_rcu_unlock: |
d0b96690 | 4684 | rcu_read_unlock(); |
d5d629b5 DG |
4685 | if (ret) { |
4686 | free(fields); | |
4687 | } | |
d0b96690 DG |
4688 | return ret; |
4689 | } | |
4690 | ||
d88aee68 DG |
4691 | /* |
4692 | * Add event to the UST channel registry. When the event is added to the | |
4693 | * registry, the metadata is also created. Once done, this replies to the | |
4694 | * application with the appropriate error code. | |
4695 | * | |
4696 | * The session UST registry lock is acquired in the function. | |
4697 | * | |
4698 | * On success 0 is returned else a negative value. | |
4699 | */ | |
d0b96690 DG |
4700 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4701 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4702 | char *model_emf_uri) | |
4703 | { | |
4704 | int ret, ret_code; | |
4705 | uint32_t event_id = 0; | |
7972aab2 | 4706 | uint64_t chan_reg_key; |
d0b96690 DG |
4707 | struct ust_app *app; |
4708 | struct ust_app_channel *ua_chan; | |
4709 | struct ust_app_session *ua_sess; | |
7972aab2 | 4710 | struct ust_registry_session *registry; |
d0b96690 DG |
4711 | |
4712 | rcu_read_lock(); | |
4713 | ||
4714 | /* Lookup application. If not found, there is a code flow error. */ | |
4715 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4716 | if (!app) { |
4717 | DBG("Application socket %d is being teardown. Abort event notify", | |
4718 | sock); | |
4719 | ret = 0; | |
d5d629b5 DG |
4720 | free(sig); |
4721 | free(fields); | |
4722 | free(model_emf_uri); | |
d88aee68 DG |
4723 | goto error_rcu_unlock; |
4724 | } | |
d0b96690 | 4725 | |
4950b860 | 4726 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4727 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4728 | if (!ua_chan) { |
4729 | DBG("Application channel is being teardown. Abort event notify"); | |
4730 | ret = 0; | |
d5d629b5 DG |
4731 | free(sig); |
4732 | free(fields); | |
4733 | free(model_emf_uri); | |
4950b860 MD |
4734 | goto error_rcu_unlock; |
4735 | } | |
4736 | ||
d0b96690 DG |
4737 | assert(ua_chan->session); |
4738 | ua_sess = ua_chan->session; | |
4739 | ||
7972aab2 DG |
4740 | registry = get_session_registry(ua_sess); |
4741 | assert(registry); | |
4742 | ||
4743 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4744 | chan_reg_key = ua_chan->tracing_channel_id; | |
4745 | } else { | |
4746 | chan_reg_key = ua_chan->key; | |
4747 | } | |
4748 | ||
4749 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4750 | |
d5d629b5 DG |
4751 | /* |
4752 | * From this point on, this call acquires the ownership of the sig, fields | |
4753 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4754 | * three variables MUST NOT be read/write after this. | |
4755 | */ | |
7972aab2 | 4756 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4757 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
9664f59b MD |
4758 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4759 | app); | |
d0b96690 DG |
4760 | |
4761 | /* | |
4762 | * The return value is returned to ustctl so in case of an error, the | |
4763 | * application can be notified. In case of an error, it's important not to | |
4764 | * return a negative error or else the application will get closed. | |
4765 | */ | |
4766 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4767 | if (ret < 0) { | |
4768 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4769 | ERR("UST app reply event failed with ret %d", ret); | |
4770 | } else { | |
4771 | DBG3("UST app reply event failed. Application died"); | |
4772 | } | |
4773 | /* | |
4774 | * No need to wipe the create event since the application socket will | |
4775 | * get close on error hence cleaning up everything by itself. | |
4776 | */ | |
4777 | goto error; | |
4778 | } | |
4779 | ||
7972aab2 DG |
4780 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4781 | name, event_id); | |
d88aee68 | 4782 | |
d0b96690 | 4783 | error: |
7972aab2 | 4784 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4785 | error_rcu_unlock: |
d0b96690 DG |
4786 | rcu_read_unlock(); |
4787 | return ret; | |
4788 | } | |
4789 | ||
d88aee68 DG |
4790 | /* |
4791 | * Handle application notification through the given notify socket. | |
4792 | * | |
4793 | * Return 0 on success or else a negative value. | |
4794 | */ | |
d0b96690 DG |
4795 | int ust_app_recv_notify(int sock) |
4796 | { | |
4797 | int ret; | |
4798 | enum ustctl_notify_cmd cmd; | |
4799 | ||
4800 | DBG3("UST app receiving notify from sock %d", sock); | |
4801 | ||
4802 | ret = ustctl_recv_notify(sock, &cmd); | |
4803 | if (ret < 0) { | |
4804 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4805 | ERR("UST app recv notify failed with ret %d", ret); | |
4806 | } else { | |
4807 | DBG3("UST app recv notify failed. Application died"); | |
4808 | } | |
4809 | goto error; | |
4810 | } | |
4811 | ||
4812 | switch (cmd) { | |
4813 | case USTCTL_NOTIFY_CMD_EVENT: | |
4814 | { | |
4815 | int sobjd, cobjd, loglevel; | |
4816 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4817 | size_t nr_fields; | |
4818 | struct ustctl_field *fields; | |
4819 | ||
4820 | DBG2("UST app ustctl register event received"); | |
4821 | ||
4822 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4823 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4824 | if (ret < 0) { | |
4825 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4826 | ERR("UST app recv event failed with ret %d", ret); | |
4827 | } else { | |
4828 | DBG3("UST app recv event failed. Application died"); | |
4829 | } | |
4830 | goto error; | |
4831 | } | |
4832 | ||
d5d629b5 DG |
4833 | /* |
4834 | * Add event to the UST registry coming from the notify socket. This | |
4835 | * call will free if needed the sig, fields and model_emf_uri. This | |
4836 | * code path loses the ownsership of these variables and transfer them | |
4837 | * to the this function. | |
4838 | */ | |
d0b96690 DG |
4839 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4840 | fields, loglevel, model_emf_uri); | |
4841 | if (ret < 0) { | |
4842 | goto error; | |
4843 | } | |
4844 | ||
4845 | break; | |
4846 | } | |
4847 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4848 | { | |
4849 | int sobjd, cobjd; | |
4850 | size_t nr_fields; | |
4851 | struct ustctl_field *fields; | |
4852 | ||
4853 | DBG2("UST app ustctl register channel received"); | |
4854 | ||
4855 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4856 | &fields); | |
4857 | if (ret < 0) { | |
4858 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4859 | ERR("UST app recv channel failed with ret %d", ret); | |
4860 | } else { | |
4861 | DBG3("UST app recv channel failed. Application died"); | |
4862 | } | |
4863 | goto error; | |
4864 | } | |
4865 | ||
d5d629b5 DG |
4866 | /* |
4867 | * The fields ownership are transfered to this function call meaning | |
4868 | * that if needed it will be freed. After this, it's invalid to access | |
4869 | * fields or clean it up. | |
4870 | */ | |
d0b96690 DG |
4871 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4872 | fields); | |
4873 | if (ret < 0) { | |
4874 | goto error; | |
4875 | } | |
4876 | ||
4877 | break; | |
4878 | } | |
4879 | default: | |
4880 | /* Should NEVER happen. */ | |
4881 | assert(0); | |
4882 | } | |
4883 | ||
4884 | error: | |
4885 | return ret; | |
4886 | } | |
d88aee68 DG |
4887 | |
4888 | /* | |
4889 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4890 | * corresponding application. On failure, the call_rcu to close the socket is | |
4891 | * executed. If an application is found, it tries to delete it from the notify | |
4892 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4893 | * | |
4894 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4895 | * call RCU is not done but the rest of the cleanup is. | |
4896 | */ | |
4897 | void ust_app_notify_sock_unregister(int sock) | |
4898 | { | |
4899 | int err_enomem = 0; | |
4900 | struct lttng_ht_iter iter; | |
4901 | struct ust_app *app; | |
4902 | struct ust_app_notify_sock_obj *obj; | |
4903 | ||
4904 | assert(sock >= 0); | |
4905 | ||
4906 | rcu_read_lock(); | |
4907 | ||
4908 | obj = zmalloc(sizeof(*obj)); | |
4909 | if (!obj) { | |
4910 | /* | |
4911 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4912 | * procedure but the call_rcu will not be called. In this case, we | |
4913 | * accept the fd leak rather than possibly creating an unsynchronized | |
4914 | * state between threads. | |
4915 | * | |
4916 | * TODO: The notify object should be created once the notify socket is | |
4917 | * registered and stored independantely from the ust app object. The | |
4918 | * tricky part is to synchronize the teardown of the application and | |
4919 | * this notify object. Let's keep that in mind so we can avoid this | |
4920 | * kind of shenanigans with ENOMEM in the teardown path. | |
4921 | */ | |
4922 | err_enomem = 1; | |
4923 | } else { | |
4924 | obj->fd = sock; | |
4925 | } | |
4926 | ||
4927 | DBG("UST app notify socket unregister %d", sock); | |
4928 | ||
4929 | /* | |
4930 | * Lookup application by notify socket. If this fails, this means that the | |
4931 | * hash table delete has already been done by the application | |
4932 | * unregistration process so we can safely close the notify socket in a | |
4933 | * call RCU. | |
4934 | */ | |
4935 | app = find_app_by_notify_sock(sock); | |
4936 | if (!app) { | |
4937 | goto close_socket; | |
4938 | } | |
4939 | ||
4940 | iter.iter.node = &app->notify_sock_n.node; | |
4941 | ||
4942 | /* | |
4943 | * Whatever happens here either we fail or succeed, in both cases we have | |
4944 | * to close the socket after a grace period to continue to the call RCU | |
4945 | * here. If the deletion is successful, the application is not visible | |
4946 | * anymore by other threads and is it fails it means that it was already | |
4947 | * deleted from the hash table so either way we just have to close the | |
4948 | * socket. | |
4949 | */ | |
4950 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4951 | ||
4952 | close_socket: | |
4953 | rcu_read_unlock(); | |
4954 | ||
4955 | /* | |
4956 | * Close socket after a grace period to avoid for the socket to be reused | |
4957 | * before the application object is freed creating potential race between | |
4958 | * threads trying to add unique in the global hash table. | |
4959 | */ | |
4960 | if (!err_enomem) { | |
4961 | call_rcu(&obj->head, close_notify_sock_rcu); | |
4962 | } | |
4963 | } | |
f45e313d DG |
4964 | |
4965 | /* | |
4966 | * Destroy a ust app data structure and free its memory. | |
4967 | */ | |
4968 | void ust_app_destroy(struct ust_app *app) | |
4969 | { | |
4970 | if (!app) { | |
4971 | return; | |
4972 | } | |
4973 | ||
4974 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
4975 | } |