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; | |
35700c8a DG |
392 | ret = lttng_ht_del(app->ust_objd, &iter); |
393 | assert(!ret); | |
ffe60014 DG |
394 | ret = ustctl_release_object(sock, ua_chan->obj); |
395 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
396 | ERR("UST app sock %d release channel obj failed with ret %d", | |
397 | sock, ret); | |
398 | } | |
7972aab2 | 399 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
400 | free(ua_chan->obj); |
401 | } | |
36b588ed | 402 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
403 | } |
404 | ||
331744e3 | 405 | /* |
1b532a60 DG |
406 | * Push metadata to consumer socket. |
407 | * | |
408 | * The socket lock MUST be acquired. | |
409 | * The ust app session lock MUST be acquired. | |
331744e3 JD |
410 | * |
411 | * On success, return the len of metadata pushed or else a negative value. | |
412 | */ | |
413 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
414 | struct consumer_socket *socket, int send_zero_data) | |
415 | { | |
416 | int ret; | |
417 | char *metadata_str = NULL; | |
418 | size_t len, offset; | |
419 | ssize_t ret_val; | |
420 | ||
421 | assert(registry); | |
422 | assert(socket); | |
1b532a60 DG |
423 | |
424 | /* | |
425 | * On a push metadata error either the consumer is dead or the metadata | |
426 | * channel has been destroyed because its endpoint might have died (e.g: | |
427 | * relayd). If so, the metadata closed flag is set to 1 so we deny pushing | |
428 | * metadata again which is not valid anymore on the consumer side. | |
429 | * | |
430 | * The ust app session mutex locked allows us to make this check without | |
431 | * the registry lock. | |
432 | */ | |
433 | if (registry->metadata_closed) { | |
434 | return -EPIPE; | |
435 | } | |
331744e3 JD |
436 | |
437 | pthread_mutex_lock(®istry->lock); | |
438 | ||
439 | offset = registry->metadata_len_sent; | |
440 | len = registry->metadata_len - registry->metadata_len_sent; | |
441 | if (len == 0) { | |
442 | DBG3("No metadata to push for metadata key %" PRIu64, | |
443 | registry->metadata_key); | |
444 | ret_val = len; | |
445 | if (send_zero_data) { | |
446 | DBG("No metadata to push"); | |
447 | goto push_data; | |
448 | } | |
449 | goto end; | |
450 | } | |
451 | ||
452 | /* Allocate only what we have to send. */ | |
453 | metadata_str = zmalloc(len); | |
454 | if (!metadata_str) { | |
455 | PERROR("zmalloc ust app metadata string"); | |
456 | ret_val = -ENOMEM; | |
457 | goto error; | |
458 | } | |
459 | /* Copy what we haven't send out. */ | |
460 | memcpy(metadata_str, registry->metadata + offset, len); | |
461 | registry->metadata_len_sent += len; | |
462 | ||
463 | push_data: | |
464 | pthread_mutex_unlock(®istry->lock); | |
465 | ret = consumer_push_metadata(socket, registry->metadata_key, | |
466 | metadata_str, len, offset); | |
467 | if (ret < 0) { | |
890d27f4 DG |
468 | /* |
469 | * There is an acceptable race here between the registry metadata key | |
470 | * assignment and the creation on the consumer. The session daemon can | |
471 | * concurrently push metadata for this registry while being created on | |
472 | * the consumer since the metadata key of the registry is assigned | |
473 | * *before* it is setup to avoid the consumer to ask for metadata that | |
474 | * could possibly be not found in the session daemon. | |
475 | * | |
476 | * The metadata will get pushed either by the session being stopped or | |
477 | * the consumer requesting metadata if that race is triggered. | |
478 | */ | |
479 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
480 | ret = 0; | |
481 | } | |
f36ec06c DG |
482 | |
483 | /* Update back the actual metadata len sent since it failed here. */ | |
484 | pthread_mutex_lock(®istry->lock); | |
485 | registry->metadata_len_sent -= len; | |
486 | pthread_mutex_unlock(®istry->lock); | |
331744e3 JD |
487 | ret_val = ret; |
488 | goto error_push; | |
489 | } | |
490 | ||
491 | free(metadata_str); | |
492 | return len; | |
493 | ||
494 | end: | |
495 | error: | |
496 | pthread_mutex_unlock(®istry->lock); | |
497 | error_push: | |
498 | free(metadata_str); | |
499 | return ret_val; | |
500 | } | |
501 | ||
d88aee68 DG |
502 | /* |
503 | * For a given application and session, push metadata to consumer. The session | |
504 | * lock MUST be acquired here before calling this. | |
331744e3 JD |
505 | * Either sock or consumer is required : if sock is NULL, the default |
506 | * socket to send the metadata is retrieved from consumer, if sock | |
507 | * is not NULL we use it to send the metadata. | |
d88aee68 DG |
508 | * |
509 | * Return 0 on success else a negative error. | |
510 | */ | |
7972aab2 DG |
511 | static int push_metadata(struct ust_registry_session *registry, |
512 | struct consumer_output *consumer) | |
d88aee68 | 513 | { |
331744e3 JD |
514 | int ret_val; |
515 | ssize_t ret; | |
d88aee68 DG |
516 | struct consumer_socket *socket; |
517 | ||
7972aab2 DG |
518 | assert(registry); |
519 | assert(consumer); | |
520 | ||
521 | rcu_read_lock(); | |
d88aee68 | 522 | |
7972aab2 DG |
523 | /* |
524 | * Means that no metadata was assigned to the session. This can happens if | |
525 | * no start has been done previously. | |
526 | */ | |
527 | if (!registry->metadata_key) { | |
331744e3 | 528 | ret_val = 0; |
1b532a60 | 529 | goto end_rcu_unlock; |
d88aee68 DG |
530 | } |
531 | ||
d88aee68 | 532 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
533 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
534 | consumer); | |
d88aee68 | 535 | if (!socket) { |
331744e3 | 536 | ret_val = -1; |
d88aee68 DG |
537 | goto error_rcu_unlock; |
538 | } | |
539 | ||
540 | /* | |
541 | * TODO: Currently, we hold the socket lock around sampling of the next | |
542 | * metadata segment to ensure we send metadata over the consumer socket in | |
543 | * the correct order. This makes the registry lock nest inside the socket | |
544 | * lock. | |
545 | * | |
546 | * Please note that this is a temporary measure: we should move this lock | |
547 | * back into ust_consumer_push_metadata() when the consumer gets the | |
548 | * ability to reorder the metadata it receives. | |
549 | */ | |
550 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
551 | ret = ust_app_push_metadata(registry, socket, 0); |
552 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 553 | if (ret < 0) { |
331744e3 | 554 | ret_val = ret; |
d88aee68 DG |
555 | goto error_rcu_unlock; |
556 | } | |
557 | ||
d88aee68 | 558 | rcu_read_unlock(); |
d88aee68 DG |
559 | return 0; |
560 | ||
d88aee68 | 561 | error_rcu_unlock: |
1b532a60 DG |
562 | /* |
563 | * On error, flag the registry that the metadata is closed. We were unable | |
564 | * to push anything and this means that either the consumer is not | |
565 | * responding or the metadata cache has been destroyed on the consumer. | |
566 | */ | |
567 | registry->metadata_closed = 1; | |
568 | end_rcu_unlock: | |
d88aee68 | 569 | rcu_read_unlock(); |
331744e3 | 570 | return ret_val; |
d88aee68 DG |
571 | } |
572 | ||
573 | /* | |
574 | * Send to the consumer a close metadata command for the given session. Once | |
575 | * done, the metadata channel is deleted and the session metadata pointer is | |
576 | * nullified. The session lock MUST be acquired here unless the application is | |
577 | * in the destroy path. | |
578 | * | |
579 | * Return 0 on success else a negative value. | |
580 | */ | |
7972aab2 DG |
581 | static int close_metadata(struct ust_registry_session *registry, |
582 | struct consumer_output *consumer) | |
d88aee68 DG |
583 | { |
584 | int ret; | |
585 | struct consumer_socket *socket; | |
586 | ||
7972aab2 DG |
587 | assert(registry); |
588 | assert(consumer); | |
d88aee68 | 589 | |
7972aab2 DG |
590 | rcu_read_lock(); |
591 | ||
592 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 | 593 | ret = 0; |
1b532a60 | 594 | goto end; |
d88aee68 DG |
595 | } |
596 | ||
d88aee68 | 597 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
598 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
599 | consumer); | |
d88aee68 DG |
600 | if (!socket) { |
601 | ret = -1; | |
7972aab2 | 602 | goto error; |
d88aee68 DG |
603 | } |
604 | ||
7972aab2 | 605 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 606 | if (ret < 0) { |
7972aab2 | 607 | goto error; |
d88aee68 DG |
608 | } |
609 | ||
d88aee68 | 610 | error: |
1b532a60 DG |
611 | /* |
612 | * Metadata closed. Even on error this means that the consumer is not | |
613 | * responding or not found so either way a second close should NOT be emit | |
614 | * for this registry. | |
615 | */ | |
616 | registry->metadata_closed = 1; | |
617 | end: | |
7972aab2 | 618 | rcu_read_unlock(); |
d88aee68 DG |
619 | return ret; |
620 | } | |
621 | ||
36b588ed MD |
622 | /* |
623 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
624 | * section and outside of call_rcu thread, so we postpone its execution |
625 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
626 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
627 | */ |
628 | static | |
629 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
630 | { | |
631 | struct ust_app_session *ua_sess = | |
632 | caa_container_of(head, struct ust_app_session, rcu_head); | |
633 | ||
0b2dc8df | 634 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
635 | free(ua_sess); |
636 | } | |
637 | ||
d80a6244 DG |
638 | /* |
639 | * Delete ust app session safely. RCU read lock must be held before calling | |
640 | * this function. | |
641 | */ | |
8b366481 | 642 | static |
d0b96690 DG |
643 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
644 | struct ust_app *app) | |
d80a6244 DG |
645 | { |
646 | int ret; | |
bec39940 | 647 | struct lttng_ht_iter iter; |
d80a6244 | 648 | struct ust_app_channel *ua_chan; |
7972aab2 | 649 | struct ust_registry_session *registry; |
d80a6244 | 650 | |
d88aee68 DG |
651 | assert(ua_sess); |
652 | ||
1b532a60 DG |
653 | pthread_mutex_lock(&ua_sess->lock); |
654 | ||
7972aab2 | 655 | registry = get_session_registry(ua_sess); |
1b532a60 | 656 | if (registry && !registry->metadata_closed) { |
d88aee68 | 657 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 658 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 659 | |
7972aab2 DG |
660 | /* |
661 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
662 | * metadata only on destroy trace session in this case. Also, the |
663 | * previous push metadata could have flag the metadata registry to | |
664 | * close so don't send a close command if closed. | |
7972aab2 | 665 | */ |
1b532a60 DG |
666 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
667 | !registry->metadata_closed) { | |
7972aab2 DG |
668 | /* And ask to close it for this session registry. */ |
669 | (void) close_metadata(registry, ua_sess->consumer); | |
670 | } | |
d80a6244 DG |
671 | } |
672 | ||
bec39940 DG |
673 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
674 | node.node) { | |
675 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 676 | assert(!ret); |
d0b96690 | 677 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 678 | } |
d80a6244 | 679 | |
7972aab2 DG |
680 | /* In case of per PID, the registry is kept in the session. */ |
681 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
682 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
683 | if (reg_pid) { | |
684 | buffer_reg_pid_remove(reg_pid); | |
685 | buffer_reg_pid_destroy(reg_pid); | |
686 | } | |
687 | } | |
d0b96690 | 688 | |
aee6bafd | 689 | if (ua_sess->handle != -1) { |
ffe60014 DG |
690 | ret = ustctl_release_handle(sock, ua_sess->handle); |
691 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
692 | ERR("UST app sock %d release session handle failed with ret %d", | |
693 | sock, ret); | |
694 | } | |
aee6bafd | 695 | } |
1b532a60 DG |
696 | pthread_mutex_unlock(&ua_sess->lock); |
697 | ||
36b588ed | 698 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 699 | } |
91d76f53 DG |
700 | |
701 | /* | |
284d8f55 DG |
702 | * Delete a traceable application structure from the global list. Never call |
703 | * this function outside of a call_rcu call. | |
36b588ed MD |
704 | * |
705 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 706 | */ |
8b366481 DG |
707 | static |
708 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 709 | { |
8b366481 | 710 | int ret, sock; |
d42f20df | 711 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 712 | |
d80a6244 | 713 | /* Delete ust app sessions info */ |
852d0037 DG |
714 | sock = app->sock; |
715 | app->sock = -1; | |
d80a6244 | 716 | |
8b366481 | 717 | /* Wipe sessions */ |
d42f20df DG |
718 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
719 | teardown_node) { | |
720 | /* Free every object in the session and the session. */ | |
36b588ed | 721 | rcu_read_lock(); |
d0b96690 | 722 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 723 | rcu_read_unlock(); |
d80a6244 | 724 | } |
36b588ed | 725 | |
0b2dc8df MD |
726 | ht_cleanup_push(app->sessions); |
727 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 728 | |
6414a713 | 729 | /* |
852d0037 DG |
730 | * Wait until we have deleted the application from the sock hash table |
731 | * before closing this socket, otherwise an application could re-use the | |
732 | * socket ID and race with the teardown, using the same hash table entry. | |
733 | * | |
734 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
735 | * all RCU readers that could run concurrently with unregister app, | |
736 | * therefore we _need_ to only close that socket after a grace period. So | |
737 | * it should stay in this RCU callback. | |
738 | * | |
739 | * This close() is a very important step of the synchronization model so | |
740 | * every modification to this function must be carefully reviewed. | |
6414a713 | 741 | */ |
799e2c4f MD |
742 | ret = close(sock); |
743 | if (ret) { | |
744 | PERROR("close"); | |
745 | } | |
4063050c | 746 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 747 | |
852d0037 | 748 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 749 | free(app); |
099e26bd DG |
750 | } |
751 | ||
752 | /* | |
f6a9efaa | 753 | * URCU intermediate call to delete an UST app. |
099e26bd | 754 | */ |
8b366481 DG |
755 | static |
756 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 757 | { |
bec39940 DG |
758 | struct lttng_ht_node_ulong *node = |
759 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 760 | struct ust_app *app = |
852d0037 | 761 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 762 | |
852d0037 | 763 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 764 | delete_ust_app(app); |
099e26bd DG |
765 | } |
766 | ||
ffe60014 DG |
767 | /* |
768 | * Delete the session from the application ht and delete the data structure by | |
769 | * freeing every object inside and releasing them. | |
770 | */ | |
d0b96690 | 771 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
772 | struct ust_app_session *ua_sess) |
773 | { | |
774 | int ret; | |
775 | struct lttng_ht_iter iter; | |
776 | ||
777 | assert(app); | |
778 | assert(ua_sess); | |
779 | ||
780 | iter.iter.node = &ua_sess->node.node; | |
781 | ret = lttng_ht_del(app->sessions, &iter); | |
782 | if (ret) { | |
783 | /* Already scheduled for teardown. */ | |
784 | goto end; | |
785 | } | |
786 | ||
787 | /* Once deleted, free the data structure. */ | |
d0b96690 | 788 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
789 | |
790 | end: | |
791 | return; | |
792 | } | |
793 | ||
8b366481 DG |
794 | /* |
795 | * Alloc new UST app session. | |
796 | */ | |
797 | static | |
d0b96690 | 798 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
799 | { |
800 | struct ust_app_session *ua_sess; | |
801 | ||
802 | /* Init most of the default value by allocating and zeroing */ | |
803 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
804 | if (ua_sess == NULL) { | |
805 | PERROR("malloc"); | |
ffe60014 | 806 | goto error_free; |
8b366481 DG |
807 | } |
808 | ||
809 | ua_sess->handle = -1; | |
bec39940 | 810 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
d0b96690 | 811 | pthread_mutex_init(&ua_sess->lock, NULL); |
ffe60014 | 812 | |
8b366481 DG |
813 | return ua_sess; |
814 | ||
ffe60014 | 815 | error_free: |
8b366481 DG |
816 | return NULL; |
817 | } | |
818 | ||
819 | /* | |
820 | * Alloc new UST app channel. | |
821 | */ | |
822 | static | |
823 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 824 | struct ust_app_session *ua_sess, |
ffe60014 | 825 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
826 | { |
827 | struct ust_app_channel *ua_chan; | |
828 | ||
829 | /* Init most of the default value by allocating and zeroing */ | |
830 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
831 | if (ua_chan == NULL) { | |
832 | PERROR("malloc"); | |
833 | goto error; | |
834 | } | |
835 | ||
836 | /* Setup channel name */ | |
837 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
838 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
839 | ||
840 | ua_chan->enabled = 1; | |
841 | ua_chan->handle = -1; | |
45893984 | 842 | ua_chan->session = ua_sess; |
ffe60014 | 843 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
844 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
845 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
846 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
847 | |
848 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
4623416f | 849 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
850 | |
851 | /* Copy attributes */ | |
852 | if (attr) { | |
ffe60014 | 853 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
854 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
855 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
856 | ua_chan->attr.overwrite = attr->overwrite; | |
857 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
858 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
859 | ua_chan->attr.output = attr->output; | |
8b366481 | 860 | } |
ffe60014 DG |
861 | /* By default, the channel is a per cpu channel. */ |
862 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
863 | |
864 | DBG3("UST app channel %s allocated", ua_chan->name); | |
865 | ||
866 | return ua_chan; | |
867 | ||
868 | error: | |
869 | return NULL; | |
870 | } | |
871 | ||
37f1c236 DG |
872 | /* |
873 | * Allocate and initialize a UST app stream. | |
874 | * | |
875 | * Return newly allocated stream pointer or NULL on error. | |
876 | */ | |
ffe60014 | 877 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
878 | { |
879 | struct ust_app_stream *stream = NULL; | |
880 | ||
881 | stream = zmalloc(sizeof(*stream)); | |
882 | if (stream == NULL) { | |
883 | PERROR("zmalloc ust app stream"); | |
884 | goto error; | |
885 | } | |
886 | ||
887 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
888 | stream->handle = -1; | |
889 | ||
890 | error: | |
891 | return stream; | |
892 | } | |
893 | ||
8b366481 DG |
894 | /* |
895 | * Alloc new UST app event. | |
896 | */ | |
897 | static | |
898 | struct ust_app_event *alloc_ust_app_event(char *name, | |
899 | struct lttng_ust_event *attr) | |
900 | { | |
901 | struct ust_app_event *ua_event; | |
902 | ||
903 | /* Init most of the default value by allocating and zeroing */ | |
904 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
905 | if (ua_event == NULL) { | |
906 | PERROR("malloc"); | |
907 | goto error; | |
908 | } | |
909 | ||
910 | ua_event->enabled = 1; | |
911 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
912 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 913 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
914 | |
915 | /* Copy attributes */ | |
916 | if (attr) { | |
917 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
918 | } | |
919 | ||
920 | DBG3("UST app event %s allocated", ua_event->name); | |
921 | ||
922 | return ua_event; | |
923 | ||
924 | error: | |
925 | return NULL; | |
926 | } | |
927 | ||
928 | /* | |
929 | * Alloc new UST app context. | |
930 | */ | |
931 | static | |
932 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
933 | { | |
934 | struct ust_app_ctx *ua_ctx; | |
935 | ||
936 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
937 | if (ua_ctx == NULL) { | |
938 | goto error; | |
939 | } | |
940 | ||
4623416f DG |
941 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
942 | ||
8b366481 DG |
943 | if (uctx) { |
944 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
945 | } | |
946 | ||
947 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
948 | ||
949 | error: | |
950 | return ua_ctx; | |
951 | } | |
952 | ||
025faf73 DG |
953 | /* |
954 | * Allocate a filter and copy the given original filter. | |
955 | * | |
956 | * Return allocated filter or NULL on error. | |
957 | */ | |
958 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
959 | struct lttng_ust_filter_bytecode *orig_f) | |
960 | { | |
961 | struct lttng_ust_filter_bytecode *filter = NULL; | |
962 | ||
963 | /* Copy filter bytecode */ | |
964 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
965 | if (!filter) { | |
966 | PERROR("zmalloc alloc ust app filter"); | |
967 | goto error; | |
968 | } | |
969 | ||
970 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
971 | ||
972 | error: | |
973 | return filter; | |
974 | } | |
975 | ||
099e26bd | 976 | /* |
421cb601 DG |
977 | * Find an ust_app using the sock and return it. RCU read side lock must be |
978 | * held before calling this helper function. | |
099e26bd | 979 | */ |
8b366481 DG |
980 | static |
981 | struct ust_app *find_app_by_sock(int sock) | |
099e26bd | 982 | { |
bec39940 | 983 | struct lttng_ht_node_ulong *node; |
bec39940 | 984 | struct lttng_ht_iter iter; |
f6a9efaa | 985 | |
852d0037 | 986 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 987 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
988 | if (node == NULL) { |
989 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
990 | goto error; |
991 | } | |
852d0037 DG |
992 | |
993 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
994 | |
995 | error: | |
996 | return NULL; | |
099e26bd DG |
997 | } |
998 | ||
d0b96690 DG |
999 | /* |
1000 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1001 | * be held before calling this helper function. | |
1002 | */ | |
1003 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1004 | { | |
1005 | struct lttng_ht_node_ulong *node; | |
1006 | struct lttng_ht_iter iter; | |
1007 | ||
1008 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1009 | &iter); | |
1010 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1011 | if (node == NULL) { | |
1012 | DBG2("UST app find by notify sock %d not found", sock); | |
1013 | goto error; | |
1014 | } | |
1015 | ||
1016 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1017 | ||
1018 | error: | |
1019 | return NULL; | |
1020 | } | |
1021 | ||
025faf73 DG |
1022 | /* |
1023 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1024 | * event loglevel. | |
1025 | * | |
1026 | * Return an ust_app_event object or NULL on error. | |
1027 | */ | |
18eace3b DG |
1028 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
1029 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel) | |
1030 | { | |
1031 | struct lttng_ht_iter iter; | |
1032 | struct lttng_ht_node_str *node; | |
1033 | struct ust_app_event *event = NULL; | |
1034 | struct ust_app_ht_key key; | |
18eace3b DG |
1035 | |
1036 | assert(name); | |
1037 | assert(ht); | |
1038 | ||
1039 | /* Setup key for event lookup. */ | |
1040 | key.name = name; | |
1041 | key.filter = filter; | |
1042 | key.loglevel = loglevel; | |
1043 | ||
025faf73 DG |
1044 | /* Lookup using the event name as hash and a custom match fct. */ |
1045 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1046 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1047 | node = lttng_ht_iter_get_node_str(&iter); |
1048 | if (node == NULL) { | |
1049 | goto end; | |
1050 | } | |
1051 | ||
1052 | event = caa_container_of(node, struct ust_app_event, node); | |
1053 | ||
1054 | end: | |
18eace3b DG |
1055 | return event; |
1056 | } | |
1057 | ||
55cc08a6 DG |
1058 | /* |
1059 | * Create the channel context on the tracer. | |
d0b96690 DG |
1060 | * |
1061 | * Called with UST app session lock held. | |
55cc08a6 DG |
1062 | */ |
1063 | static | |
1064 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1065 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1066 | { | |
1067 | int ret; | |
1068 | ||
840cb59c | 1069 | health_code_update(); |
86acf0da | 1070 | |
852d0037 | 1071 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1072 | ua_chan->obj, &ua_ctx->obj); |
1073 | if (ret < 0) { | |
ffe60014 DG |
1074 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1075 | ERR("UST app create channel context failed for app (pid: %d) " | |
1076 | "with ret %d", app->pid, ret); | |
1077 | } else { | |
47cb9d4a DG |
1078 | /* |
1079 | * This is normal behavior, an application can die during the | |
1080 | * creation process. Don't report an error so the execution can | |
1081 | * continue normally. | |
1082 | */ | |
1083 | ret = 0; | |
ffe60014 DG |
1084 | DBG3("UST app disable event failed. Application is dead."); |
1085 | } | |
55cc08a6 DG |
1086 | goto error; |
1087 | } | |
1088 | ||
1089 | ua_ctx->handle = ua_ctx->obj->handle; | |
1090 | ||
d0b96690 DG |
1091 | DBG2("UST app context handle %d created successfully for channel %s", |
1092 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1093 | |
1094 | error: | |
840cb59c | 1095 | health_code_update(); |
55cc08a6 DG |
1096 | return ret; |
1097 | } | |
1098 | ||
53a80697 MD |
1099 | /* |
1100 | * Set the filter on the tracer. | |
1101 | */ | |
1102 | static | |
1103 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1104 | struct ust_app *app) | |
1105 | { | |
1106 | int ret; | |
1107 | ||
840cb59c | 1108 | health_code_update(); |
86acf0da | 1109 | |
53a80697 | 1110 | if (!ua_event->filter) { |
86acf0da DG |
1111 | ret = 0; |
1112 | goto error; | |
53a80697 MD |
1113 | } |
1114 | ||
1115 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1116 | ua_event->obj); | |
1117 | if (ret < 0) { | |
ffe60014 DG |
1118 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1119 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1120 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1121 | } else { | |
47cb9d4a DG |
1122 | /* |
1123 | * This is normal behavior, an application can die during the | |
1124 | * creation process. Don't report an error so the execution can | |
1125 | * continue normally. | |
1126 | */ | |
1127 | ret = 0; | |
ffe60014 DG |
1128 | DBG3("UST app filter event failed. Application is dead."); |
1129 | } | |
53a80697 MD |
1130 | goto error; |
1131 | } | |
1132 | ||
1133 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1134 | ||
1135 | error: | |
840cb59c | 1136 | health_code_update(); |
53a80697 MD |
1137 | return ret; |
1138 | } | |
1139 | ||
9730260e DG |
1140 | /* |
1141 | * Disable the specified event on to UST tracer for the UST session. | |
1142 | */ | |
1143 | static int disable_ust_event(struct ust_app *app, | |
1144 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1145 | { | |
1146 | int ret; | |
1147 | ||
840cb59c | 1148 | health_code_update(); |
86acf0da | 1149 | |
852d0037 | 1150 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1151 | if (ret < 0) { |
ffe60014 DG |
1152 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1153 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1154 | "and session handle %d with ret %d", | |
1155 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1156 | } else { | |
47cb9d4a DG |
1157 | /* |
1158 | * This is normal behavior, an application can die during the | |
1159 | * creation process. Don't report an error so the execution can | |
1160 | * continue normally. | |
1161 | */ | |
1162 | ret = 0; | |
ffe60014 DG |
1163 | DBG3("UST app disable event failed. Application is dead."); |
1164 | } | |
9730260e DG |
1165 | goto error; |
1166 | } | |
1167 | ||
1168 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1169 | ua_event->attr.name, app->pid); |
9730260e DG |
1170 | |
1171 | error: | |
840cb59c | 1172 | health_code_update(); |
9730260e DG |
1173 | return ret; |
1174 | } | |
1175 | ||
78f0bacd DG |
1176 | /* |
1177 | * Disable the specified channel on to UST tracer for the UST session. | |
1178 | */ | |
1179 | static int disable_ust_channel(struct ust_app *app, | |
1180 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1181 | { | |
1182 | int ret; | |
1183 | ||
840cb59c | 1184 | health_code_update(); |
86acf0da | 1185 | |
852d0037 | 1186 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1187 | if (ret < 0) { |
ffe60014 DG |
1188 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1189 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1190 | "and session handle %d with ret %d", | |
1191 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1192 | } else { | |
47cb9d4a DG |
1193 | /* |
1194 | * This is normal behavior, an application can die during the | |
1195 | * creation process. Don't report an error so the execution can | |
1196 | * continue normally. | |
1197 | */ | |
1198 | ret = 0; | |
ffe60014 DG |
1199 | DBG3("UST app disable channel failed. Application is dead."); |
1200 | } | |
78f0bacd DG |
1201 | goto error; |
1202 | } | |
1203 | ||
78f0bacd | 1204 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1205 | ua_chan->name, app->pid); |
78f0bacd DG |
1206 | |
1207 | error: | |
840cb59c | 1208 | health_code_update(); |
78f0bacd DG |
1209 | return ret; |
1210 | } | |
1211 | ||
1212 | /* | |
1213 | * Enable the specified channel on to UST tracer for the UST session. | |
1214 | */ | |
1215 | static int enable_ust_channel(struct ust_app *app, | |
1216 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1217 | { | |
1218 | int ret; | |
1219 | ||
840cb59c | 1220 | health_code_update(); |
86acf0da | 1221 | |
852d0037 | 1222 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1223 | if (ret < 0) { |
ffe60014 DG |
1224 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1225 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1226 | "and session handle %d with ret %d", | |
1227 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1228 | } else { | |
47cb9d4a DG |
1229 | /* |
1230 | * This is normal behavior, an application can die during the | |
1231 | * creation process. Don't report an error so the execution can | |
1232 | * continue normally. | |
1233 | */ | |
1234 | ret = 0; | |
ffe60014 DG |
1235 | DBG3("UST app enable channel failed. Application is dead."); |
1236 | } | |
78f0bacd DG |
1237 | goto error; |
1238 | } | |
1239 | ||
1240 | ua_chan->enabled = 1; | |
1241 | ||
1242 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1243 | ua_chan->name, app->pid); |
78f0bacd DG |
1244 | |
1245 | error: | |
840cb59c | 1246 | health_code_update(); |
78f0bacd DG |
1247 | return ret; |
1248 | } | |
1249 | ||
edb67388 DG |
1250 | /* |
1251 | * Enable the specified event on to UST tracer for the UST session. | |
1252 | */ | |
1253 | static int enable_ust_event(struct ust_app *app, | |
1254 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1255 | { | |
1256 | int ret; | |
1257 | ||
840cb59c | 1258 | health_code_update(); |
86acf0da | 1259 | |
852d0037 | 1260 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1261 | if (ret < 0) { |
ffe60014 DG |
1262 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1263 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1264 | "and session handle %d with ret %d", | |
1265 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1266 | } else { | |
47cb9d4a DG |
1267 | /* |
1268 | * This is normal behavior, an application can die during the | |
1269 | * creation process. Don't report an error so the execution can | |
1270 | * continue normally. | |
1271 | */ | |
1272 | ret = 0; | |
ffe60014 DG |
1273 | DBG3("UST app enable event failed. Application is dead."); |
1274 | } | |
edb67388 DG |
1275 | goto error; |
1276 | } | |
1277 | ||
1278 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1279 | ua_event->attr.name, app->pid); |
edb67388 DG |
1280 | |
1281 | error: | |
840cb59c | 1282 | health_code_update(); |
edb67388 DG |
1283 | return ret; |
1284 | } | |
1285 | ||
099e26bd | 1286 | /* |
7972aab2 | 1287 | * Send channel and stream buffer to application. |
4f3ab6ee | 1288 | * |
ffe60014 | 1289 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1290 | */ |
7972aab2 DG |
1291 | static int send_channel_pid_to_ust(struct ust_app *app, |
1292 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1293 | { |
1294 | int ret; | |
ffe60014 | 1295 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1296 | |
1297 | assert(app); | |
ffe60014 | 1298 | assert(ua_sess); |
4f3ab6ee | 1299 | assert(ua_chan); |
4f3ab6ee | 1300 | |
840cb59c | 1301 | health_code_update(); |
4f3ab6ee | 1302 | |
7972aab2 DG |
1303 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1304 | app->sock); | |
86acf0da | 1305 | |
ffe60014 DG |
1306 | /* Send channel to the application. */ |
1307 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1308 | if (ret < 0) { |
b551a063 DG |
1309 | goto error; |
1310 | } | |
1311 | ||
d88aee68 DG |
1312 | health_code_update(); |
1313 | ||
ffe60014 DG |
1314 | /* Send all streams to application. */ |
1315 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1316 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1317 | if (ret < 0) { | |
1318 | goto error; | |
1319 | } | |
1320 | /* We don't need the stream anymore once sent to the tracer. */ | |
1321 | cds_list_del(&stream->list); | |
1322 | delete_ust_app_stream(-1, stream); | |
1323 | } | |
ffe60014 DG |
1324 | /* Flag the channel that it is sent to the application. */ |
1325 | ua_chan->is_sent = 1; | |
ffe60014 | 1326 | |
b551a063 | 1327 | error: |
840cb59c | 1328 | health_code_update(); |
b551a063 DG |
1329 | return ret; |
1330 | } | |
1331 | ||
91d76f53 | 1332 | /* |
5b4a0ec0 | 1333 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1334 | * |
1335 | * Should be called with session mutex held. | |
91d76f53 | 1336 | */ |
edb67388 DG |
1337 | static |
1338 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1339 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1340 | { |
5b4a0ec0 | 1341 | int ret = 0; |
284d8f55 | 1342 | |
840cb59c | 1343 | health_code_update(); |
86acf0da | 1344 | |
5b4a0ec0 | 1345 | /* Create UST event on tracer */ |
852d0037 | 1346 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1347 | &ua_event->obj); |
1348 | if (ret < 0) { | |
ffe60014 DG |
1349 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1350 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1351 | ua_event->attr.name, app->pid, ret); | |
1352 | } else { | |
47cb9d4a DG |
1353 | /* |
1354 | * This is normal behavior, an application can die during the | |
1355 | * creation process. Don't report an error so the execution can | |
1356 | * continue normally. | |
1357 | */ | |
1358 | ret = 0; | |
ffe60014 DG |
1359 | DBG3("UST app create event failed. Application is dead."); |
1360 | } | |
5b4a0ec0 | 1361 | goto error; |
91d76f53 | 1362 | } |
f6a9efaa | 1363 | |
5b4a0ec0 | 1364 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1365 | |
5b4a0ec0 | 1366 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1367 | ua_event->attr.name, app->pid); |
f6a9efaa | 1368 | |
840cb59c | 1369 | health_code_update(); |
86acf0da | 1370 | |
025faf73 DG |
1371 | /* Set filter if one is present. */ |
1372 | if (ua_event->filter) { | |
1373 | ret = set_ust_event_filter(ua_event, app); | |
1374 | if (ret < 0) { | |
1375 | goto error; | |
1376 | } | |
1377 | } | |
1378 | ||
8535a6d9 | 1379 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 1380 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
1381 | ret = disable_ust_event(app, ua_sess, ua_event); |
1382 | if (ret < 0) { | |
fc34caaa DG |
1383 | /* |
1384 | * If we hit an EPERM, something is wrong with our disable call. If | |
1385 | * we get an EEXIST, there is a problem on the tracer side since we | |
1386 | * just created it. | |
1387 | */ | |
1388 | switch (ret) { | |
49c336c1 | 1389 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1390 | /* Code flow problem */ |
1391 | assert(0); | |
49c336c1 | 1392 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1393 | /* It's OK for our use case. */ |
1394 | ret = 0; | |
1395 | break; | |
1396 | default: | |
1397 | break; | |
1398 | } | |
8535a6d9 DG |
1399 | goto error; |
1400 | } | |
1401 | } | |
1402 | ||
5b4a0ec0 | 1403 | error: |
840cb59c | 1404 | health_code_update(); |
5b4a0ec0 | 1405 | return ret; |
91d76f53 | 1406 | } |
48842b30 | 1407 | |
5b4a0ec0 DG |
1408 | /* |
1409 | * Copy data between an UST app event and a LTT event. | |
1410 | */ | |
421cb601 | 1411 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1412 | struct ltt_ust_event *uevent) |
1413 | { | |
1414 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); | |
1415 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1416 | ||
fc34caaa DG |
1417 | ua_event->enabled = uevent->enabled; |
1418 | ||
5b4a0ec0 DG |
1419 | /* Copy event attributes */ |
1420 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1421 | ||
53a80697 MD |
1422 | /* Copy filter bytecode */ |
1423 | if (uevent->filter) { | |
025faf73 DG |
1424 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1425 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1426 | } |
48842b30 DG |
1427 | } |
1428 | ||
5b4a0ec0 DG |
1429 | /* |
1430 | * Copy data between an UST app channel and a LTT channel. | |
1431 | */ | |
421cb601 | 1432 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1433 | struct ltt_ust_channel *uchan) |
1434 | { | |
bec39940 | 1435 | struct lttng_ht_iter iter; |
48842b30 | 1436 | struct ltt_ust_event *uevent; |
55cc08a6 | 1437 | struct ltt_ust_context *uctx; |
48842b30 | 1438 | struct ust_app_event *ua_event; |
55cc08a6 | 1439 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1440 | |
fc34caaa | 1441 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1442 | |
1443 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1444 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1445 | |
1624d5b7 JD |
1446 | ua_chan->tracefile_size = uchan->tracefile_size; |
1447 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1448 | ||
ffe60014 DG |
1449 | /* Copy event attributes since the layout is different. */ |
1450 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1451 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1452 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1453 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1454 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1455 | ua_chan->attr.output = uchan->attr.output; | |
1456 | /* | |
1457 | * Note that the attribute channel type is not set since the channel on the | |
1458 | * tracing registry side does not have this information. | |
1459 | */ | |
48842b30 | 1460 | |
fc34caaa | 1461 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1462 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1463 | |
4623416f | 1464 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1465 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1466 | if (ua_ctx == NULL) { | |
1467 | continue; | |
1468 | } | |
bec39940 DG |
1469 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1470 | (unsigned long) ua_ctx->ctx.ctx); | |
1471 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
4623416f | 1472 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1473 | } |
48842b30 | 1474 | |
421cb601 | 1475 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1476 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b DG |
1477 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
1478 | uevent->filter, uevent->attr.loglevel); | |
1479 | if (ua_event == NULL) { | |
421cb601 | 1480 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1481 | uevent->attr.name); |
284d8f55 | 1482 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1483 | if (ua_event == NULL) { |
5b4a0ec0 | 1484 | continue; |
48842b30 | 1485 | } |
421cb601 | 1486 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1487 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1488 | } |
48842b30 DG |
1489 | } |
1490 | ||
fc34caaa | 1491 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1492 | } |
1493 | ||
5b4a0ec0 DG |
1494 | /* |
1495 | * Copy data between a UST app session and a regular LTT session. | |
1496 | */ | |
421cb601 | 1497 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1498 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1499 | { |
bec39940 DG |
1500 | struct lttng_ht_node_str *ua_chan_node; |
1501 | struct lttng_ht_iter iter; | |
48842b30 DG |
1502 | struct ltt_ust_channel *uchan; |
1503 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1504 | time_t rawtime; |
1505 | struct tm *timeinfo; | |
1506 | char datetime[16]; | |
1507 | int ret; | |
1508 | ||
1509 | /* Get date and time for unique app path */ | |
1510 | time(&rawtime); | |
1511 | timeinfo = localtime(&rawtime); | |
1512 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1513 | |
421cb601 | 1514 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1515 | |
7972aab2 DG |
1516 | ua_sess->tracing_id = usess->id; |
1517 | ua_sess->id = get_next_session_id(); | |
1518 | ua_sess->uid = app->uid; | |
1519 | ua_sess->gid = app->gid; | |
1520 | ua_sess->euid = usess->uid; | |
1521 | ua_sess->egid = usess->gid; | |
1522 | ua_sess->buffer_type = usess->buffer_type; | |
1523 | ua_sess->bits_per_long = app->bits_per_long; | |
1524 | /* There is only one consumer object per session possible. */ | |
1525 | ua_sess->consumer = usess->consumer; | |
1526 | ||
1527 | switch (ua_sess->buffer_type) { | |
1528 | case LTTNG_BUFFER_PER_PID: | |
1529 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1530 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1531 | datetime); |
1532 | break; | |
1533 | case LTTNG_BUFFER_PER_UID: | |
1534 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1535 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1536 | break; | |
1537 | default: | |
1538 | assert(0); | |
1539 | goto error; | |
1540 | } | |
477d7741 MD |
1541 | if (ret < 0) { |
1542 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1543 | assert(0); |
7972aab2 | 1544 | goto error; |
477d7741 MD |
1545 | } |
1546 | ||
48842b30 | 1547 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1548 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1549 | uchan, node.node) { | |
1550 | struct lttng_ht_iter uiter; | |
ba767faf | 1551 | |
bec39940 DG |
1552 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1553 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1554 | if (ua_chan_node != NULL) { |
fc34caaa | 1555 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1556 | continue; |
1557 | } | |
421cb601 | 1558 | |
5b4a0ec0 DG |
1559 | DBG2("Channel %s not found on shadow session copy, creating it", |
1560 | uchan->name); | |
d0b96690 | 1561 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1562 | if (ua_chan == NULL) { |
fc34caaa | 1563 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1564 | continue; |
48842b30 | 1565 | } |
5b4a0ec0 | 1566 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1567 | /* |
1568 | * The concept of metadata channel does not exist on the tracing | |
1569 | * registry side of the session daemon so this can only be a per CPU | |
1570 | * channel and not metadata. | |
1571 | */ | |
1572 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1573 | ||
bec39940 | 1574 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1575 | } |
7972aab2 DG |
1576 | |
1577 | error: | |
1578 | return; | |
48842b30 DG |
1579 | } |
1580 | ||
78f0bacd DG |
1581 | /* |
1582 | * Lookup sesison wrapper. | |
1583 | */ | |
84cd17c6 MD |
1584 | static |
1585 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1586 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1587 | { |
1588 | /* Get right UST app session from app */ | |
77c5447b | 1589 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1590 | } |
1591 | ||
421cb601 DG |
1592 | /* |
1593 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1594 | * id. |
421cb601 | 1595 | */ |
48842b30 DG |
1596 | static struct ust_app_session *lookup_session_by_app( |
1597 | struct ltt_ust_session *usess, struct ust_app *app) | |
1598 | { | |
bec39940 | 1599 | struct lttng_ht_iter iter; |
77c5447b | 1600 | struct lttng_ht_node_u64 *node; |
48842b30 | 1601 | |
84cd17c6 | 1602 | __lookup_session_by_app(usess, app, &iter); |
77c5447b | 1603 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1604 | if (node == NULL) { |
1605 | goto error; | |
1606 | } | |
1607 | ||
1608 | return caa_container_of(node, struct ust_app_session, node); | |
1609 | ||
1610 | error: | |
1611 | return NULL; | |
1612 | } | |
1613 | ||
7972aab2 DG |
1614 | /* |
1615 | * Setup buffer registry per PID for the given session and application. If none | |
1616 | * is found, a new one is created, added to the global registry and | |
1617 | * initialized. If regp is valid, it's set with the newly created object. | |
1618 | * | |
1619 | * Return 0 on success or else a negative value. | |
1620 | */ | |
1621 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1622 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1623 | { | |
1624 | int ret = 0; | |
1625 | struct buffer_reg_pid *reg_pid; | |
1626 | ||
1627 | assert(ua_sess); | |
1628 | assert(app); | |
1629 | ||
1630 | rcu_read_lock(); | |
1631 | ||
1632 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1633 | if (!reg_pid) { | |
1634 | /* | |
1635 | * This is the create channel path meaning that if there is NO | |
1636 | * registry available, we have to create one for this session. | |
1637 | */ | |
1638 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1639 | if (ret < 0) { | |
1640 | goto error; | |
1641 | } | |
1642 | buffer_reg_pid_add(reg_pid); | |
1643 | } else { | |
1644 | goto end; | |
1645 | } | |
1646 | ||
1647 | /* Initialize registry. */ | |
1648 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1649 | app->bits_per_long, app->uint8_t_alignment, | |
1650 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1651 | app->uint64_t_alignment, app->long_alignment, |
1652 | app->byte_order, app->version.major, | |
1653 | app->version.minor); | |
7972aab2 DG |
1654 | if (ret < 0) { |
1655 | goto error; | |
1656 | } | |
1657 | ||
1658 | DBG3("UST app buffer registry per PID created successfully"); | |
1659 | ||
1660 | end: | |
1661 | if (regp) { | |
1662 | *regp = reg_pid; | |
1663 | } | |
1664 | error: | |
1665 | rcu_read_unlock(); | |
1666 | return ret; | |
1667 | } | |
1668 | ||
1669 | /* | |
1670 | * Setup buffer registry per UID for the given session and application. If none | |
1671 | * is found, a new one is created, added to the global registry and | |
1672 | * initialized. If regp is valid, it's set with the newly created object. | |
1673 | * | |
1674 | * Return 0 on success or else a negative value. | |
1675 | */ | |
1676 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1677 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1678 | { | |
1679 | int ret = 0; | |
1680 | struct buffer_reg_uid *reg_uid; | |
1681 | ||
1682 | assert(usess); | |
1683 | assert(app); | |
1684 | ||
1685 | rcu_read_lock(); | |
1686 | ||
1687 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1688 | if (!reg_uid) { | |
1689 | /* | |
1690 | * This is the create channel path meaning that if there is NO | |
1691 | * registry available, we have to create one for this session. | |
1692 | */ | |
1693 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1694 | LTTNG_DOMAIN_UST, ®_uid); | |
1695 | if (ret < 0) { | |
1696 | goto error; | |
1697 | } | |
1698 | buffer_reg_uid_add(reg_uid); | |
1699 | } else { | |
1700 | goto end; | |
1701 | } | |
1702 | ||
1703 | /* Initialize registry. */ | |
af6142cf | 1704 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1705 | app->bits_per_long, app->uint8_t_alignment, |
1706 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1707 | app->uint64_t_alignment, app->long_alignment, |
1708 | app->byte_order, app->version.major, | |
1709 | app->version.minor); | |
7972aab2 DG |
1710 | if (ret < 0) { |
1711 | goto error; | |
1712 | } | |
1713 | /* Add node to teardown list of the session. */ | |
1714 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1715 | ||
1716 | DBG3("UST app buffer registry per UID created successfully"); | |
1717 | ||
1718 | end: | |
1719 | if (regp) { | |
1720 | *regp = reg_uid; | |
1721 | } | |
1722 | error: | |
1723 | rcu_read_unlock(); | |
1724 | return ret; | |
1725 | } | |
1726 | ||
421cb601 | 1727 | /* |
3d8ca23b | 1728 | * Create a session on the tracer side for the given app. |
421cb601 | 1729 | * |
3d8ca23b DG |
1730 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1731 | * untouched. If the session was created, is_created is set to 1. On error, | |
1732 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1733 | * be NULL. | |
1734 | * | |
1735 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1736 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1737 | */ |
3d8ca23b DG |
1738 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1739 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1740 | int *is_created) | |
421cb601 | 1741 | { |
3d8ca23b | 1742 | int ret, created = 0; |
421cb601 DG |
1743 | struct ust_app_session *ua_sess; |
1744 | ||
3d8ca23b DG |
1745 | assert(usess); |
1746 | assert(app); | |
1747 | assert(ua_sess_ptr); | |
1748 | ||
840cb59c | 1749 | health_code_update(); |
86acf0da | 1750 | |
421cb601 DG |
1751 | ua_sess = lookup_session_by_app(usess, app); |
1752 | if (ua_sess == NULL) { | |
77c5447b | 1753 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1754 | app->pid, usess->id); |
d0b96690 | 1755 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1756 | if (ua_sess == NULL) { |
1757 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1758 | ret = -ENOMEM; |
1759 | goto error; | |
421cb601 | 1760 | } |
477d7741 | 1761 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1762 | created = 1; |
421cb601 DG |
1763 | } |
1764 | ||
7972aab2 DG |
1765 | switch (usess->buffer_type) { |
1766 | case LTTNG_BUFFER_PER_PID: | |
1767 | /* Init local registry. */ | |
1768 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1769 | if (ret < 0) { |
7972aab2 DG |
1770 | goto error; |
1771 | } | |
1772 | break; | |
1773 | case LTTNG_BUFFER_PER_UID: | |
1774 | /* Look for a global registry. If none exists, create one. */ | |
1775 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1776 | if (ret < 0) { | |
1777 | goto error; | |
1778 | } | |
1779 | break; | |
1780 | default: | |
1781 | assert(0); | |
1782 | ret = -EINVAL; | |
1783 | goto error; | |
1784 | } | |
1785 | ||
1786 | health_code_update(); | |
1787 | ||
1788 | if (ua_sess->handle == -1) { | |
1789 | ret = ustctl_create_session(app->sock); | |
1790 | if (ret < 0) { | |
1791 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1792 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1793 | app->pid, ret); |
1794 | } else { | |
1795 | DBG("UST app creating session failed. Application is dead"); | |
47cb9d4a DG |
1796 | /* |
1797 | * This is normal behavior, an application can die during the | |
1798 | * creation process. Don't report an error so the execution can | |
1799 | * continue normally. This will get flagged ENOTCONN and the | |
1800 | * caller will handle it. | |
1801 | */ | |
1802 | ret = 0; | |
ffe60014 | 1803 | } |
d0b96690 | 1804 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1805 | if (ret != -ENOMEM) { |
1806 | /* | |
1807 | * Tracer is probably gone or got an internal error so let's | |
1808 | * behave like it will soon unregister or not usable. | |
1809 | */ | |
1810 | ret = -ENOTCONN; | |
1811 | } | |
1812 | goto error; | |
421cb601 DG |
1813 | } |
1814 | ||
7972aab2 DG |
1815 | ua_sess->handle = ret; |
1816 | ||
1817 | /* Add ust app session to app's HT */ | |
77c5447b MD |
1818 | lttng_ht_node_init_u64(&ua_sess->node, |
1819 | ua_sess->tracing_id); | |
1820 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1821 | |
1822 | DBG2("UST app session created successfully with handle %d", ret); | |
1823 | } | |
1824 | ||
1825 | *ua_sess_ptr = ua_sess; | |
1826 | if (is_created) { | |
1827 | *is_created = created; | |
1828 | } | |
1829 | ||
1830 | /* Everything went well. */ | |
1831 | ret = 0; | |
1832 | ||
1833 | error: | |
1834 | health_code_update(); | |
1835 | return ret; | |
1836 | } | |
1837 | ||
1838 | /* | |
1839 | * Create a context for the channel on the tracer. | |
1840 | * | |
1841 | * Called with UST app session lock held and a RCU read side lock. | |
1842 | */ | |
1843 | static | |
1844 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1845 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1846 | struct ust_app *app) | |
1847 | { | |
1848 | int ret = 0; | |
1849 | struct lttng_ht_iter iter; | |
1850 | struct lttng_ht_node_ulong *node; | |
1851 | struct ust_app_ctx *ua_ctx; | |
1852 | ||
1853 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1854 | ||
1855 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); | |
1856 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1857 | if (node != NULL) { | |
1858 | ret = -EEXIST; | |
1859 | goto error; | |
1860 | } | |
1861 | ||
1862 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1863 | if (ua_ctx == NULL) { | |
1864 | /* malloc failed */ | |
1865 | ret = -1; | |
1866 | goto error; | |
1867 | } | |
1868 | ||
1869 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
1870 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
4623416f | 1871 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
1872 | |
1873 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1874 | if (ret < 0) { | |
1875 | goto error; | |
1876 | } | |
1877 | ||
1878 | error: | |
1879 | return ret; | |
1880 | } | |
1881 | ||
1882 | /* | |
1883 | * Enable on the tracer side a ust app event for the session and channel. | |
1884 | * | |
1885 | * Called with UST app session lock held. | |
1886 | */ | |
1887 | static | |
1888 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
1889 | struct ust_app_event *ua_event, struct ust_app *app) | |
1890 | { | |
1891 | int ret; | |
1892 | ||
1893 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1894 | if (ret < 0) { | |
1895 | goto error; | |
1896 | } | |
1897 | ||
1898 | ua_event->enabled = 1; | |
1899 | ||
1900 | error: | |
1901 | return ret; | |
1902 | } | |
1903 | ||
1904 | /* | |
1905 | * Disable on the tracer side a ust app event for the session and channel. | |
1906 | */ | |
1907 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
1908 | struct ust_app_event *ua_event, struct ust_app *app) | |
1909 | { | |
1910 | int ret; | |
1911 | ||
1912 | ret = disable_ust_event(app, ua_sess, ua_event); | |
1913 | if (ret < 0) { | |
1914 | goto error; | |
1915 | } | |
1916 | ||
1917 | ua_event->enabled = 0; | |
1918 | ||
1919 | error: | |
1920 | return ret; | |
1921 | } | |
1922 | ||
1923 | /* | |
1924 | * Lookup ust app channel for session and disable it on the tracer side. | |
1925 | */ | |
1926 | static | |
1927 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
1928 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
1929 | { | |
1930 | int ret; | |
1931 | ||
1932 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
1933 | if (ret < 0) { | |
1934 | goto error; | |
1935 | } | |
1936 | ||
1937 | ua_chan->enabled = 0; | |
1938 | ||
1939 | error: | |
1940 | return ret; | |
1941 | } | |
1942 | ||
1943 | /* | |
1944 | * Lookup ust app channel for session and enable it on the tracer side. This | |
1945 | * MUST be called with a RCU read side lock acquired. | |
1946 | */ | |
1947 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
1948 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
1949 | { | |
1950 | int ret = 0; | |
1951 | struct lttng_ht_iter iter; | |
1952 | struct lttng_ht_node_str *ua_chan_node; | |
1953 | struct ust_app_channel *ua_chan; | |
1954 | ||
1955 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
1956 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
1957 | if (ua_chan_node == NULL) { | |
77c5447b | 1958 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
1959 | uchan->name, ua_sess->tracing_id); |
1960 | goto error; | |
1961 | } | |
1962 | ||
1963 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
1964 | ||
1965 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
1966 | if (ret < 0) { | |
1967 | goto error; | |
1968 | } | |
1969 | ||
1970 | error: | |
1971 | return ret; | |
1972 | } | |
1973 | ||
1974 | /* | |
1975 | * Ask the consumer to create a channel and get it if successful. | |
1976 | * | |
1977 | * Return 0 on success or else a negative value. | |
1978 | */ | |
1979 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
1980 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
1981 | int bitness, struct ust_registry_session *registry) | |
1982 | { | |
1983 | int ret; | |
1984 | unsigned int nb_fd = 0; | |
1985 | struct consumer_socket *socket; | |
1986 | ||
1987 | assert(usess); | |
1988 | assert(ua_sess); | |
1989 | assert(ua_chan); | |
1990 | assert(registry); | |
1991 | ||
1992 | rcu_read_lock(); | |
1993 | health_code_update(); | |
1994 | ||
1995 | /* Get the right consumer socket for the application. */ | |
1996 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
1997 | if (!socket) { | |
1998 | ret = -EINVAL; | |
1999 | goto error; | |
2000 | } | |
2001 | ||
2002 | health_code_update(); | |
2003 | ||
2004 | /* Need one fd for the channel. */ | |
2005 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2006 | if (ret < 0) { | |
2007 | ERR("Exhausted number of available FD upon create channel"); | |
2008 | goto error; | |
2009 | } | |
2010 | ||
2011 | /* | |
2012 | * Ask consumer to create channel. The consumer will return the number of | |
2013 | * stream we have to expect. | |
2014 | */ | |
2015 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2016 | registry); | |
2017 | if (ret < 0) { | |
2018 | goto error_ask; | |
2019 | } | |
2020 | ||
2021 | /* | |
2022 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2023 | * stream (2 being the default value here). | |
2024 | */ | |
2025 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2026 | ||
2027 | /* Reserve the amount of file descriptor we need. */ | |
2028 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2029 | if (ret < 0) { | |
2030 | ERR("Exhausted number of available FD upon create channel"); | |
2031 | goto error_fd_get_stream; | |
2032 | } | |
2033 | ||
2034 | health_code_update(); | |
2035 | ||
2036 | /* | |
2037 | * Now get the channel from the consumer. This call wil populate the stream | |
2038 | * list of that channel and set the ust objects. | |
2039 | */ | |
d9078d0c DG |
2040 | if (usess->consumer->enabled) { |
2041 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2042 | if (ret < 0) { | |
2043 | goto error_destroy; | |
2044 | } | |
7972aab2 DG |
2045 | } |
2046 | ||
2047 | rcu_read_unlock(); | |
2048 | return 0; | |
2049 | ||
2050 | error_destroy: | |
2051 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2052 | error_fd_get_stream: | |
2053 | /* | |
2054 | * Initiate a destroy channel on the consumer since we had an error | |
2055 | * handling it on our side. The return value is of no importance since we | |
2056 | * already have a ret value set by the previous error that we need to | |
2057 | * return. | |
2058 | */ | |
2059 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2060 | error_ask: | |
2061 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2062 | error: | |
2063 | health_code_update(); | |
2064 | rcu_read_unlock(); | |
2065 | return ret; | |
2066 | } | |
2067 | ||
2068 | /* | |
2069 | * Duplicate the ust data object of the ust app stream and save it in the | |
2070 | * buffer registry stream. | |
2071 | * | |
2072 | * Return 0 on success or else a negative value. | |
2073 | */ | |
2074 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2075 | struct ust_app_stream *stream) | |
2076 | { | |
2077 | int ret; | |
2078 | ||
2079 | assert(reg_stream); | |
2080 | assert(stream); | |
2081 | ||
2082 | /* Reserve the amount of file descriptor we need. */ | |
2083 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2084 | if (ret < 0) { | |
2085 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2086 | goto error; | |
2087 | } | |
2088 | ||
2089 | /* Duplicate object for stream once the original is in the registry. */ | |
2090 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2091 | reg_stream->obj.ust); | |
2092 | if (ret < 0) { | |
2093 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2094 | reg_stream->obj.ust, stream->obj, ret); | |
2095 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2096 | goto error; | |
2097 | } | |
2098 | stream->handle = stream->obj->handle; | |
2099 | ||
2100 | error: | |
2101 | return ret; | |
2102 | } | |
2103 | ||
2104 | /* | |
2105 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2106 | * buffer registry channel. | |
2107 | * | |
2108 | * Return 0 on success or else a negative value. | |
2109 | */ | |
2110 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2111 | struct ust_app_channel *ua_chan) | |
2112 | { | |
2113 | int ret; | |
2114 | ||
2115 | assert(reg_chan); | |
2116 | assert(ua_chan); | |
2117 | ||
2118 | /* Need two fds for the channel. */ | |
2119 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2120 | if (ret < 0) { | |
2121 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2122 | goto error_fd_get; | |
2123 | } | |
2124 | ||
2125 | /* Duplicate object for stream once the original is in the registry. */ | |
2126 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2127 | if (ret < 0) { | |
2128 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2129 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2130 | goto error; | |
2131 | } | |
2132 | ua_chan->handle = ua_chan->obj->handle; | |
2133 | ||
2134 | return 0; | |
2135 | ||
2136 | error: | |
2137 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2138 | error_fd_get: | |
2139 | return ret; | |
2140 | } | |
2141 | ||
2142 | /* | |
2143 | * For a given channel buffer registry, setup all streams of the given ust | |
2144 | * application channel. | |
2145 | * | |
2146 | * Return 0 on success or else a negative value. | |
2147 | */ | |
2148 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2149 | struct ust_app_channel *ua_chan) | |
2150 | { | |
2151 | int ret = 0; | |
2152 | struct ust_app_stream *stream, *stmp; | |
2153 | ||
2154 | assert(reg_chan); | |
2155 | assert(ua_chan); | |
2156 | ||
2157 | DBG2("UST app setup buffer registry stream"); | |
2158 | ||
2159 | /* Send all streams to application. */ | |
2160 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2161 | struct buffer_reg_stream *reg_stream; | |
2162 | ||
2163 | ret = buffer_reg_stream_create(®_stream); | |
2164 | if (ret < 0) { | |
2165 | goto error; | |
2166 | } | |
2167 | ||
2168 | /* | |
2169 | * Keep original pointer and nullify it in the stream so the delete | |
2170 | * stream call does not release the object. | |
2171 | */ | |
2172 | reg_stream->obj.ust = stream->obj; | |
2173 | stream->obj = NULL; | |
2174 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2175 | |
7972aab2 DG |
2176 | /* We don't need the streams anymore. */ |
2177 | cds_list_del(&stream->list); | |
2178 | delete_ust_app_stream(-1, stream); | |
2179 | } | |
421cb601 | 2180 | |
7972aab2 DG |
2181 | error: |
2182 | return ret; | |
2183 | } | |
2184 | ||
2185 | /* | |
2186 | * Create a buffer registry channel for the given session registry and | |
2187 | * application channel object. If regp pointer is valid, it's set with the | |
2188 | * created object. Important, the created object is NOT added to the session | |
2189 | * registry hash table. | |
2190 | * | |
2191 | * Return 0 on success else a negative value. | |
2192 | */ | |
2193 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2194 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2195 | { | |
2196 | int ret; | |
2197 | struct buffer_reg_channel *reg_chan = NULL; | |
2198 | ||
2199 | assert(reg_sess); | |
2200 | assert(ua_chan); | |
2201 | ||
2202 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2203 | ||
2204 | /* Create buffer registry channel. */ | |
2205 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2206 | if (ret < 0) { | |
2207 | goto error_create; | |
421cb601 | 2208 | } |
7972aab2 DG |
2209 | assert(reg_chan); |
2210 | reg_chan->consumer_key = ua_chan->key; | |
421cb601 | 2211 | |
7972aab2 DG |
2212 | /* Create and add a channel registry to session. */ |
2213 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2214 | ua_chan->tracing_channel_id); | |
2215 | if (ret < 0) { | |
2216 | goto error; | |
d88aee68 | 2217 | } |
7972aab2 | 2218 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2219 | |
7972aab2 DG |
2220 | if (regp) { |
2221 | *regp = reg_chan; | |
3d8ca23b | 2222 | } |
d88aee68 | 2223 | |
7972aab2 | 2224 | return 0; |
3d8ca23b DG |
2225 | |
2226 | error: | |
7972aab2 DG |
2227 | /* Safe because the registry channel object was not added to any HT. */ |
2228 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2229 | error_create: | |
3d8ca23b | 2230 | return ret; |
421cb601 DG |
2231 | } |
2232 | ||
55cc08a6 | 2233 | /* |
7972aab2 DG |
2234 | * Setup buffer registry channel for the given session registry and application |
2235 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2236 | * |
7972aab2 | 2237 | * Return 0 on success else a negative value. |
55cc08a6 | 2238 | */ |
7972aab2 DG |
2239 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2240 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2241 | { |
7972aab2 | 2242 | int ret; |
55cc08a6 | 2243 | |
7972aab2 DG |
2244 | assert(reg_sess); |
2245 | assert(reg_chan); | |
2246 | assert(ua_chan); | |
2247 | assert(ua_chan->obj); | |
55cc08a6 | 2248 | |
7972aab2 | 2249 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2250 | |
7972aab2 DG |
2251 | /* Setup all streams for the registry. */ |
2252 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2253 | if (ret < 0) { | |
55cc08a6 DG |
2254 | goto error; |
2255 | } | |
2256 | ||
7972aab2 DG |
2257 | reg_chan->obj.ust = ua_chan->obj; |
2258 | ua_chan->obj = NULL; | |
55cc08a6 | 2259 | |
7972aab2 | 2260 | return 0; |
55cc08a6 DG |
2261 | |
2262 | error: | |
7972aab2 DG |
2263 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2264 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2265 | return ret; |
2266 | } | |
2267 | ||
edb67388 | 2268 | /* |
7972aab2 | 2269 | * Send buffer registry channel to the application. |
d0b96690 | 2270 | * |
7972aab2 | 2271 | * Return 0 on success else a negative value. |
edb67388 | 2272 | */ |
7972aab2 DG |
2273 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2274 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2275 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2276 | { |
2277 | int ret; | |
7972aab2 | 2278 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2279 | |
7972aab2 DG |
2280 | assert(reg_chan); |
2281 | assert(app); | |
2282 | assert(ua_sess); | |
2283 | assert(ua_chan); | |
2284 | ||
2285 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2286 | ||
2287 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2288 | if (ret < 0) { |
2289 | goto error; | |
2290 | } | |
2291 | ||
7972aab2 DG |
2292 | /* Send channel to the application. */ |
2293 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2294 | if (ret < 0) { | |
2295 | goto error; | |
2296 | } | |
2297 | ||
2298 | health_code_update(); | |
2299 | ||
2300 | /* Send all streams to application. */ | |
2301 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2302 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2303 | struct ust_app_stream stream; | |
2304 | ||
2305 | ret = duplicate_stream_object(reg_stream, &stream); | |
2306 | if (ret < 0) { | |
2307 | goto error_stream_unlock; | |
2308 | } | |
2309 | ||
2310 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2311 | if (ret < 0) { | |
8c067051 | 2312 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2313 | goto error_stream_unlock; |
2314 | } | |
edb67388 | 2315 | |
7972aab2 DG |
2316 | /* |
2317 | * The return value is not important here. This function will output an | |
2318 | * error if needed. | |
2319 | */ | |
2320 | (void) release_ust_app_stream(-1, &stream); | |
2321 | } | |
2322 | ua_chan->is_sent = 1; | |
2323 | ||
2324 | error_stream_unlock: | |
2325 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2326 | error: |
2327 | return ret; | |
2328 | } | |
2329 | ||
9730260e | 2330 | /* |
7972aab2 DG |
2331 | * Create and send to the application the created buffers with per UID buffers. |
2332 | * | |
2333 | * Return 0 on success else a negative value. | |
9730260e | 2334 | */ |
7972aab2 DG |
2335 | static int create_channel_per_uid(struct ust_app *app, |
2336 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2337 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2338 | { |
2339 | int ret; | |
7972aab2 DG |
2340 | struct buffer_reg_uid *reg_uid; |
2341 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2342 | |
7972aab2 DG |
2343 | assert(app); |
2344 | assert(usess); | |
2345 | assert(ua_sess); | |
2346 | assert(ua_chan); | |
2347 | ||
2348 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2349 | ||
2350 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2351 | /* | |
2352 | * The session creation handles the creation of this global registry | |
2353 | * object. If none can be find, there is a code flow problem or a | |
2354 | * teardown race. | |
2355 | */ | |
2356 | assert(reg_uid); | |
2357 | ||
2358 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2359 | reg_uid); | |
2360 | if (!reg_chan) { | |
2361 | /* Create the buffer registry channel object. */ | |
2362 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2363 | if (ret < 0) { | |
2364 | goto error; | |
2365 | } | |
2366 | assert(reg_chan); | |
2367 | ||
2368 | /* | |
2369 | * Create the buffers on the consumer side. This call populates the | |
2370 | * ust app channel object with all streams and data object. | |
2371 | */ | |
2372 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2373 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2374 | if (ret < 0) { | |
07d2ae95 DG |
2375 | /* |
2376 | * Let's remove the previously created buffer registry channel so | |
2377 | * it's not visible anymore in the session registry. | |
2378 | */ | |
2379 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2380 | ua_chan->tracing_channel_id); | |
2381 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2382 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2383 | goto error; |
2384 | } | |
2385 | ||
2386 | /* | |
2387 | * Setup the streams and add it to the session registry. | |
2388 | */ | |
2389 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2390 | if (ret < 0) { | |
2391 | goto error; | |
2392 | } | |
2393 | ||
2394 | } | |
2395 | ||
2396 | /* Send buffers to the application. */ | |
2397 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2398 | if (ret < 0) { |
2399 | goto error; | |
2400 | } | |
2401 | ||
9730260e DG |
2402 | error: |
2403 | return ret; | |
2404 | } | |
2405 | ||
78f0bacd | 2406 | /* |
7972aab2 DG |
2407 | * Create and send to the application the created buffers with per PID buffers. |
2408 | * | |
2409 | * Return 0 on success else a negative value. | |
78f0bacd | 2410 | */ |
7972aab2 DG |
2411 | static int create_channel_per_pid(struct ust_app *app, |
2412 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2413 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2414 | { |
8535a6d9 | 2415 | int ret; |
7972aab2 | 2416 | struct ust_registry_session *registry; |
78f0bacd | 2417 | |
7972aab2 DG |
2418 | assert(app); |
2419 | assert(usess); | |
2420 | assert(ua_sess); | |
2421 | assert(ua_chan); | |
2422 | ||
2423 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2424 | ||
2425 | rcu_read_lock(); | |
2426 | ||
2427 | registry = get_session_registry(ua_sess); | |
2428 | assert(registry); | |
2429 | ||
2430 | /* Create and add a new channel registry to session. */ | |
2431 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2432 | if (ret < 0) { |
2433 | goto error; | |
2434 | } | |
2435 | ||
7972aab2 DG |
2436 | /* Create and get channel on the consumer side. */ |
2437 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2438 | app->bits_per_long, registry); | |
2439 | if (ret < 0) { | |
2440 | goto error; | |
2441 | } | |
2442 | ||
2443 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2444 | if (ret < 0) { | |
2445 | goto error; | |
2446 | } | |
8535a6d9 | 2447 | |
78f0bacd | 2448 | error: |
7972aab2 | 2449 | rcu_read_unlock(); |
78f0bacd DG |
2450 | return ret; |
2451 | } | |
2452 | ||
2453 | /* | |
7972aab2 DG |
2454 | * From an already allocated ust app channel, create the channel buffers if |
2455 | * need and send it to the application. This MUST be called with a RCU read | |
2456 | * side lock acquired. | |
2457 | * | |
2458 | * Return 0 on success or else a negative value. | |
78f0bacd | 2459 | */ |
7972aab2 DG |
2460 | static int do_create_channel(struct ust_app *app, |
2461 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2462 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2463 | { |
7972aab2 | 2464 | int ret; |
78f0bacd | 2465 | |
7972aab2 DG |
2466 | assert(app); |
2467 | assert(usess); | |
2468 | assert(ua_sess); | |
2469 | assert(ua_chan); | |
2470 | ||
2471 | /* Handle buffer type before sending the channel to the application. */ | |
2472 | switch (usess->buffer_type) { | |
2473 | case LTTNG_BUFFER_PER_UID: | |
2474 | { | |
2475 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2476 | if (ret < 0) { | |
2477 | goto error; | |
2478 | } | |
2479 | break; | |
2480 | } | |
2481 | case LTTNG_BUFFER_PER_PID: | |
2482 | { | |
2483 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2484 | if (ret < 0) { | |
2485 | goto error; | |
2486 | } | |
2487 | break; | |
2488 | } | |
2489 | default: | |
2490 | assert(0); | |
2491 | ret = -EINVAL; | |
78f0bacd DG |
2492 | goto error; |
2493 | } | |
2494 | ||
7972aab2 DG |
2495 | /* Initialize ust objd object using the received handle and add it. */ |
2496 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2497 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2498 | |
7972aab2 DG |
2499 | /* If channel is not enabled, disable it on the tracer */ |
2500 | if (!ua_chan->enabled) { | |
2501 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2502 | if (ret < 0) { | |
2503 | goto error; | |
2504 | } | |
78f0bacd DG |
2505 | } |
2506 | ||
2507 | error: | |
2508 | return ret; | |
2509 | } | |
2510 | ||
284d8f55 | 2511 | /* |
4d710ac2 DG |
2512 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2513 | * newly created channel if not NULL. | |
d0b96690 | 2514 | * |
36b588ed | 2515 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2516 | * |
2517 | * Return 0 on success or else a negative value. | |
284d8f55 | 2518 | */ |
4d710ac2 DG |
2519 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2520 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2521 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2522 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2523 | { |
2524 | int ret = 0; | |
bec39940 DG |
2525 | struct lttng_ht_iter iter; |
2526 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2527 | struct ust_app_channel *ua_chan; |
2528 | ||
2529 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2530 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2531 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2532 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2533 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2534 | goto end; |
5b4a0ec0 DG |
2535 | } |
2536 | ||
d0b96690 | 2537 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2538 | if (ua_chan == NULL) { |
2539 | /* Only malloc can fail here */ | |
4d710ac2 | 2540 | ret = -ENOMEM; |
094d1690 | 2541 | goto error_alloc; |
fc34caaa DG |
2542 | } |
2543 | shadow_copy_channel(ua_chan, uchan); | |
2544 | ||
ffe60014 DG |
2545 | /* Set channel type. */ |
2546 | ua_chan->attr.type = type; | |
2547 | ||
7972aab2 | 2548 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2549 | if (ret < 0) { |
2550 | goto error; | |
2551 | } | |
2552 | ||
fc34caaa | 2553 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2554 | app->pid); |
fc34caaa | 2555 | |
d0b96690 DG |
2556 | /* Only add the channel if successful on the tracer side. */ |
2557 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2558 | ||
fc34caaa | 2559 | end: |
4d710ac2 DG |
2560 | if (ua_chanp) { |
2561 | *ua_chanp = ua_chan; | |
2562 | } | |
2563 | ||
2564 | /* Everything went well. */ | |
2565 | return 0; | |
5b4a0ec0 DG |
2566 | |
2567 | error: | |
d0b96690 | 2568 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2569 | error_alloc: |
4d710ac2 | 2570 | return ret; |
5b4a0ec0 DG |
2571 | } |
2572 | ||
2573 | /* | |
2574 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2575 | * |
2576 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2577 | */ |
edb67388 DG |
2578 | static |
2579 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2580 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2581 | struct ust_app *app) | |
284d8f55 | 2582 | { |
edb67388 | 2583 | int ret = 0; |
5b4a0ec0 | 2584 | struct ust_app_event *ua_event; |
284d8f55 | 2585 | |
5b4a0ec0 | 2586 | /* Get event node */ |
18eace3b DG |
2587 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
2588 | uevent->filter, uevent->attr.loglevel); | |
2589 | if (ua_event != NULL) { | |
fc34caaa | 2590 | ret = -EEXIST; |
edb67388 DG |
2591 | goto end; |
2592 | } | |
5b4a0ec0 | 2593 | |
edb67388 DG |
2594 | /* Does not exist so create one */ |
2595 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2596 | if (ua_event == NULL) { | |
2597 | /* Only malloc can failed so something is really wrong */ | |
2598 | ret = -ENOMEM; | |
fc34caaa | 2599 | goto end; |
5b4a0ec0 | 2600 | } |
edb67388 | 2601 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2602 | |
edb67388 | 2603 | /* Create it on the tracer side */ |
5b4a0ec0 | 2604 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2605 | if (ret < 0) { |
fc34caaa | 2606 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2607 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2608 | goto error; |
2609 | } | |
2610 | ||
d0b96690 | 2611 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2612 | |
fc34caaa | 2613 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2614 | app->pid); |
7f79d3a1 | 2615 | |
edb67388 | 2616 | end: |
fc34caaa DG |
2617 | return ret; |
2618 | ||
5b4a0ec0 | 2619 | error: |
fc34caaa DG |
2620 | /* Valid. Calling here is already in a read side lock */ |
2621 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2622 | return ret; |
5b4a0ec0 DG |
2623 | } |
2624 | ||
2625 | /* | |
2626 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2627 | * |
7972aab2 | 2628 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2629 | */ |
2630 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
d65d2de8 DG |
2631 | struct ust_app *app, struct consumer_output *consumer, |
2632 | struct ustctl_consumer_channel_attr *attr) | |
5b4a0ec0 DG |
2633 | { |
2634 | int ret = 0; | |
ffe60014 | 2635 | struct ust_app_channel *metadata; |
d88aee68 | 2636 | struct consumer_socket *socket; |
7972aab2 | 2637 | struct ust_registry_session *registry; |
5b4a0ec0 | 2638 | |
ffe60014 DG |
2639 | assert(ua_sess); |
2640 | assert(app); | |
d88aee68 | 2641 | assert(consumer); |
5b4a0ec0 | 2642 | |
7972aab2 DG |
2643 | registry = get_session_registry(ua_sess); |
2644 | assert(registry); | |
2645 | ||
1b532a60 DG |
2646 | /* Metadata already exists for this registry or it was closed previously */ |
2647 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2648 | ret = 0; |
2649 | goto error; | |
5b4a0ec0 DG |
2650 | } |
2651 | ||
ffe60014 | 2652 | /* Allocate UST metadata */ |
d0b96690 | 2653 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2654 | if (!metadata) { |
2655 | /* malloc() failed */ | |
2656 | ret = -ENOMEM; | |
2657 | goto error; | |
2658 | } | |
5b4a0ec0 | 2659 | |
d65d2de8 DG |
2660 | if (!attr) { |
2661 | /* Set default attributes for metadata. */ | |
2662 | metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
2663 | metadata->attr.subbuf_size = default_get_metadata_subbuf_size(); | |
2664 | metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
0a9c6494 DG |
2665 | metadata->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER; |
2666 | metadata->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER; | |
d65d2de8 DG |
2667 | metadata->attr.output = LTTNG_UST_MMAP; |
2668 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2669 | } else { | |
2670 | memcpy(&metadata->attr, attr, sizeof(metadata->attr)); | |
2671 | metadata->attr.output = LTTNG_UST_MMAP; | |
2672 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2673 | } | |
5b4a0ec0 | 2674 | |
7972aab2 DG |
2675 | /* Need one fd for the channel. */ |
2676 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2677 | if (ret < 0) { | |
2678 | ERR("Exhausted number of available FD upon create metadata"); | |
2679 | goto error; | |
2680 | } | |
2681 | ||
4dc3dfc5 DG |
2682 | /* Get the right consumer socket for the application. */ |
2683 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2684 | if (!socket) { | |
2685 | ret = -EINVAL; | |
2686 | goto error_consumer; | |
2687 | } | |
2688 | ||
331744e3 JD |
2689 | /* |
2690 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2691 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2692 | * consumer requesting the metadata and the ask_channel call on our side | |
2693 | * did not returned yet. | |
2694 | */ | |
2695 | registry->metadata_key = metadata->key; | |
2696 | ||
d88aee68 DG |
2697 | /* |
2698 | * Ask the metadata channel creation to the consumer. The metadata object | |
2699 | * will be created by the consumer and kept their. However, the stream is | |
2700 | * never added or monitored until we do a first push metadata to the | |
2701 | * consumer. | |
2702 | */ | |
7972aab2 DG |
2703 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2704 | registry); | |
d88aee68 | 2705 | if (ret < 0) { |
f2a444f1 DG |
2706 | /* Nullify the metadata key so we don't try to close it later on. */ |
2707 | registry->metadata_key = 0; | |
d88aee68 DG |
2708 | goto error_consumer; |
2709 | } | |
2710 | ||
2711 | /* | |
2712 | * The setup command will make the metadata stream be sent to the relayd, | |
2713 | * if applicable, and the thread managing the metadatas. This is important | |
2714 | * because after this point, if an error occurs, the only way the stream | |
2715 | * can be deleted is to be monitored in the consumer. | |
2716 | */ | |
7972aab2 | 2717 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2718 | if (ret < 0) { |
f2a444f1 DG |
2719 | /* Nullify the metadata key so we don't try to close it later on. */ |
2720 | registry->metadata_key = 0; | |
d88aee68 | 2721 | goto error_consumer; |
5b4a0ec0 DG |
2722 | } |
2723 | ||
7972aab2 DG |
2724 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2725 | metadata->key, app->pid); | |
5b4a0ec0 | 2726 | |
d88aee68 | 2727 | error_consumer: |
b80f0b6c | 2728 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2729 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2730 | error: |
ffe60014 | 2731 | return ret; |
5b4a0ec0 DG |
2732 | } |
2733 | ||
2734 | /* | |
2735 | * Return pointer to traceable apps list. | |
2736 | */ | |
bec39940 | 2737 | struct lttng_ht *ust_app_get_ht(void) |
5b4a0ec0 DG |
2738 | { |
2739 | return ust_app_ht; | |
2740 | } | |
2741 | ||
2742 | /* | |
d88aee68 DG |
2743 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2744 | * acquired before calling this function. | |
5b4a0ec0 DG |
2745 | */ |
2746 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2747 | { | |
d88aee68 | 2748 | struct ust_app *app = NULL; |
bec39940 DG |
2749 | struct lttng_ht_node_ulong *node; |
2750 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2751 | |
bec39940 DG |
2752 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2753 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2754 | if (node == NULL) { |
2755 | DBG2("UST app no found with pid %d", pid); | |
2756 | goto error; | |
2757 | } | |
5b4a0ec0 DG |
2758 | |
2759 | DBG2("Found UST app by pid %d", pid); | |
2760 | ||
d88aee68 | 2761 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2762 | |
2763 | error: | |
d88aee68 | 2764 | return app; |
5b4a0ec0 DG |
2765 | } |
2766 | ||
d88aee68 DG |
2767 | /* |
2768 | * Allocate and init an UST app object using the registration information and | |
2769 | * the command socket. This is called when the command socket connects to the | |
2770 | * session daemon. | |
2771 | * | |
2772 | * The object is returned on success or else NULL. | |
2773 | */ | |
d0b96690 | 2774 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2775 | { |
d0b96690 DG |
2776 | struct ust_app *lta = NULL; |
2777 | ||
2778 | assert(msg); | |
2779 | assert(sock >= 0); | |
2780 | ||
2781 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2782 | |
173af62f DG |
2783 | if ((msg->bits_per_long == 64 && |
2784 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2785 | || (msg->bits_per_long == 32 && | |
2786 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2787 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2788 | "%d-bit long, but no consumerd for this size is available.\n", |
2789 | msg->name, msg->pid, msg->bits_per_long); | |
2790 | goto error; | |
3f2c5fcc | 2791 | } |
d0b96690 | 2792 | |
5b4a0ec0 DG |
2793 | lta = zmalloc(sizeof(struct ust_app)); |
2794 | if (lta == NULL) { | |
2795 | PERROR("malloc"); | |
d0b96690 | 2796 | goto error; |
5b4a0ec0 DG |
2797 | } |
2798 | ||
2799 | lta->ppid = msg->ppid; | |
2800 | lta->uid = msg->uid; | |
2801 | lta->gid = msg->gid; | |
d0b96690 | 2802 | |
7753dea8 | 2803 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2804 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2805 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2806 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2807 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2808 | lta->long_alignment = msg->long_alignment; | |
2809 | lta->byte_order = msg->byte_order; | |
2810 | ||
5b4a0ec0 DG |
2811 | lta->v_major = msg->major; |
2812 | lta->v_minor = msg->minor; | |
77c5447b | 2813 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
2814 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2815 | lta->notify_sock = -1; | |
d88aee68 DG |
2816 | |
2817 | /* Copy name and make sure it's NULL terminated. */ | |
2818 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2819 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2820 | ||
2821 | /* | |
2822 | * Before this can be called, when receiving the registration information, | |
2823 | * the application compatibility is checked. So, at this point, the | |
2824 | * application can work with this session daemon. | |
2825 | */ | |
d0b96690 | 2826 | lta->compatible = 1; |
5b4a0ec0 | 2827 | |
852d0037 | 2828 | lta->pid = msg->pid; |
d0b96690 | 2829 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2830 | lta->sock = sock; |
d0b96690 | 2831 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2832 | |
d42f20df DG |
2833 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2834 | ||
d0b96690 DG |
2835 | error: |
2836 | return lta; | |
2837 | } | |
2838 | ||
d88aee68 DG |
2839 | /* |
2840 | * For a given application object, add it to every hash table. | |
2841 | */ | |
d0b96690 DG |
2842 | void ust_app_add(struct ust_app *app) |
2843 | { | |
2844 | assert(app); | |
2845 | assert(app->notify_sock >= 0); | |
2846 | ||
5b4a0ec0 | 2847 | rcu_read_lock(); |
852d0037 DG |
2848 | |
2849 | /* | |
2850 | * On a re-registration, we want to kick out the previous registration of | |
2851 | * that pid | |
2852 | */ | |
d0b96690 | 2853 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
2854 | |
2855 | /* | |
2856 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
2857 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
2858 | * already in the table. | |
2859 | */ | |
d0b96690 | 2860 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 2861 | |
d0b96690 DG |
2862 | /* Add application to the notify socket hash table. */ |
2863 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
2864 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 2865 | |
d0b96690 | 2866 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
2867 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
2868 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
2869 | app->v_minor); | |
5b4a0ec0 | 2870 | |
d0b96690 DG |
2871 | rcu_read_unlock(); |
2872 | } | |
2873 | ||
d88aee68 DG |
2874 | /* |
2875 | * Set the application version into the object. | |
2876 | * | |
2877 | * Return 0 on success else a negative value either an errno code or a | |
2878 | * LTTng-UST error code. | |
2879 | */ | |
d0b96690 DG |
2880 | int ust_app_version(struct ust_app *app) |
2881 | { | |
d88aee68 DG |
2882 | int ret; |
2883 | ||
d0b96690 | 2884 | assert(app); |
d88aee68 DG |
2885 | |
2886 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2887 | if (ret < 0) { | |
2888 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2889 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2890 | } else { | |
2891 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2892 | } | |
2893 | } | |
2894 | ||
2895 | return ret; | |
5b4a0ec0 DG |
2896 | } |
2897 | ||
2898 | /* | |
2899 | * Unregister app by removing it from the global traceable app list and freeing | |
2900 | * the data struct. | |
2901 | * | |
2902 | * The socket is already closed at this point so no close to sock. | |
2903 | */ | |
2904 | void ust_app_unregister(int sock) | |
2905 | { | |
2906 | struct ust_app *lta; | |
bec39940 DG |
2907 | struct lttng_ht_node_ulong *node; |
2908 | struct lttng_ht_iter iter; | |
d42f20df | 2909 | struct ust_app_session *ua_sess; |
525b0740 | 2910 | int ret; |
5b4a0ec0 DG |
2911 | |
2912 | rcu_read_lock(); | |
886459c6 | 2913 | |
5b4a0ec0 | 2914 | /* Get the node reference for a call_rcu */ |
852d0037 | 2915 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 2916 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 2917 | assert(node); |
284d8f55 | 2918 | |
852d0037 | 2919 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
2920 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
2921 | ||
886459c6 | 2922 | /* Remove application from PID hash table */ |
852d0037 DG |
2923 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
2924 | assert(!ret); | |
2925 | ||
d88aee68 DG |
2926 | /* |
2927 | * Remove application from notify hash table. The thread handling the | |
2928 | * notify socket could have deleted the node so ignore on error because | |
2929 | * either way it's valid. The close of that socket is handled by the other | |
2930 | * thread. | |
2931 | */ | |
d0b96690 | 2932 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 2933 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 2934 | |
5b98a774 DG |
2935 | /* |
2936 | * Ignore return value since the node might have been removed before by an | |
2937 | * add replace during app registration because the PID can be reassigned by | |
2938 | * the OS. | |
2939 | */ | |
d0b96690 | 2940 | iter.iter.node = <a->pid_n.node; |
bec39940 | 2941 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
2942 | if (ret) { |
2943 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
2944 | lta->pid); | |
2945 | } | |
852d0037 | 2946 | |
d42f20df DG |
2947 | /* Remove sessions so they are not visible during deletion.*/ |
2948 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
2949 | node.node) { | |
7972aab2 DG |
2950 | struct ust_registry_session *registry; |
2951 | ||
d42f20df DG |
2952 | ret = lttng_ht_del(lta->sessions, &iter); |
2953 | if (ret) { | |
2954 | /* The session was already removed so scheduled for teardown. */ | |
2955 | continue; | |
2956 | } | |
2957 | ||
2958 | /* | |
2959 | * Add session to list for teardown. This is safe since at this point we | |
2960 | * are the only one using this list. | |
2961 | */ | |
d88aee68 DG |
2962 | pthread_mutex_lock(&ua_sess->lock); |
2963 | ||
2964 | /* | |
2965 | * Normally, this is done in the delete session process which is | |
2966 | * executed in the call rcu below. However, upon registration we can't | |
2967 | * afford to wait for the grace period before pushing data or else the | |
2968 | * data pending feature can race between the unregistration and stop | |
2969 | * command where the data pending command is sent *before* the grace | |
2970 | * period ended. | |
2971 | * | |
2972 | * The close metadata below nullifies the metadata pointer in the | |
2973 | * session so the delete session will NOT push/close a second time. | |
2974 | */ | |
7972aab2 | 2975 | registry = get_session_registry(ua_sess); |
1b532a60 | 2976 | if (registry && !registry->metadata_closed) { |
7972aab2 DG |
2977 | /* Push metadata for application before freeing the application. */ |
2978 | (void) push_metadata(registry, ua_sess->consumer); | |
2979 | ||
2980 | /* | |
2981 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
2982 | * metadata only on destroy trace session in this case. Also, the |
2983 | * previous push metadata could have flag the metadata registry to | |
2984 | * close so don't send a close command if closed. | |
7972aab2 | 2985 | */ |
1b532a60 DG |
2986 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
2987 | !registry->metadata_closed) { | |
7972aab2 DG |
2988 | /* And ask to close it for this session registry. */ |
2989 | (void) close_metadata(registry, ua_sess->consumer); | |
2990 | } | |
2991 | } | |
d88aee68 | 2992 | |
d42f20df | 2993 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 2994 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
2995 | } |
2996 | ||
852d0037 DG |
2997 | /* Free memory */ |
2998 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
2999 | ||
5b4a0ec0 DG |
3000 | rcu_read_unlock(); |
3001 | return; | |
284d8f55 DG |
3002 | } |
3003 | ||
3004 | /* | |
5b4a0ec0 | 3005 | * Return traceable_app_count |
284d8f55 | 3006 | */ |
5b4a0ec0 | 3007 | unsigned long ust_app_list_count(void) |
284d8f55 | 3008 | { |
5b4a0ec0 | 3009 | unsigned long count; |
284d8f55 | 3010 | |
5b4a0ec0 | 3011 | rcu_read_lock(); |
bec39940 | 3012 | count = lttng_ht_get_count(ust_app_ht); |
5b4a0ec0 | 3013 | rcu_read_unlock(); |
284d8f55 | 3014 | |
5b4a0ec0 | 3015 | return count; |
284d8f55 DG |
3016 | } |
3017 | ||
5b4a0ec0 DG |
3018 | /* |
3019 | * Fill events array with all events name of all registered apps. | |
3020 | */ | |
3021 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3022 | { |
5b4a0ec0 DG |
3023 | int ret, handle; |
3024 | size_t nbmem, count = 0; | |
bec39940 | 3025 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3026 | struct ust_app *app; |
c617c0c6 | 3027 | struct lttng_event *tmp_event; |
421cb601 | 3028 | |
5b4a0ec0 | 3029 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3030 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3031 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3032 | PERROR("zmalloc ust app events"); |
3033 | ret = -ENOMEM; | |
421cb601 DG |
3034 | goto error; |
3035 | } | |
3036 | ||
5b4a0ec0 | 3037 | rcu_read_lock(); |
421cb601 | 3038 | |
852d0037 | 3039 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3040 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3041 | |
840cb59c | 3042 | health_code_update(); |
86acf0da | 3043 | |
e0c7ec2b DG |
3044 | if (!app->compatible) { |
3045 | /* | |
3046 | * TODO: In time, we should notice the caller of this error by | |
3047 | * telling him that this is a version error. | |
3048 | */ | |
3049 | continue; | |
3050 | } | |
852d0037 | 3051 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3052 | if (handle < 0) { |
ffe60014 DG |
3053 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3054 | ERR("UST app list events getting handle failed for app pid %d", | |
3055 | app->pid); | |
3056 | } | |
5b4a0ec0 DG |
3057 | continue; |
3058 | } | |
421cb601 | 3059 | |
852d0037 | 3060 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3061 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3062 | /* Handle ustctl error. */ |
3063 | if (ret < 0) { | |
3064 | free(tmp_event); | |
151b126b | 3065 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3066 | ERR("UST app tp list get failed for app %d with ret %d", |
3067 | app->sock, ret); | |
3068 | } else { | |
3069 | DBG3("UST app tp list get failed. Application is dead"); | |
47cb9d4a DG |
3070 | /* |
3071 | * This is normal behavior, an application can die during the | |
3072 | * creation process. Don't report an error so the execution can | |
3073 | * continue normally. Continue normal execution. | |
3074 | */ | |
3075 | break; | |
ffe60014 DG |
3076 | } |
3077 | goto rcu_error; | |
3078 | } | |
3079 | ||
840cb59c | 3080 | health_code_update(); |
815564d8 | 3081 | if (count >= nbmem) { |
d7b3776f | 3082 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3083 | void *ptr; |
3084 | ||
815564d8 MD |
3085 | DBG2("Reallocating event list from %zu to %zu entries", nbmem, |
3086 | 2 * nbmem); | |
3087 | nbmem *= 2; | |
c617c0c6 MD |
3088 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event)); |
3089 | if (ptr == NULL) { | |
5b4a0ec0 | 3090 | PERROR("realloc ust app events"); |
c617c0c6 | 3091 | free(tmp_event); |
5b4a0ec0 DG |
3092 | ret = -ENOMEM; |
3093 | goto rcu_error; | |
3094 | } | |
c617c0c6 | 3095 | tmp_event = ptr; |
5b4a0ec0 | 3096 | } |
c617c0c6 MD |
3097 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3098 | tmp_event[count].loglevel = uiter.loglevel; | |
3099 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3100 | tmp_event[count].pid = app->pid; | |
3101 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3102 | count++; |
421cb601 | 3103 | } |
421cb601 DG |
3104 | } |
3105 | ||
5b4a0ec0 | 3106 | ret = count; |
c617c0c6 | 3107 | *events = tmp_event; |
421cb601 | 3108 | |
5b4a0ec0 | 3109 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3110 | |
5b4a0ec0 DG |
3111 | rcu_error: |
3112 | rcu_read_unlock(); | |
421cb601 | 3113 | error: |
840cb59c | 3114 | health_code_update(); |
5b4a0ec0 | 3115 | return ret; |
421cb601 DG |
3116 | } |
3117 | ||
f37d259d MD |
3118 | /* |
3119 | * Fill events array with all events name of all registered apps. | |
3120 | */ | |
3121 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3122 | { | |
3123 | int ret, handle; | |
3124 | size_t nbmem, count = 0; | |
3125 | struct lttng_ht_iter iter; | |
3126 | struct ust_app *app; | |
c617c0c6 | 3127 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3128 | |
3129 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3130 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3131 | if (tmp_event == NULL) { | |
f37d259d MD |
3132 | PERROR("zmalloc ust app event fields"); |
3133 | ret = -ENOMEM; | |
3134 | goto error; | |
3135 | } | |
3136 | ||
3137 | rcu_read_lock(); | |
3138 | ||
3139 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3140 | struct lttng_ust_field_iter uiter; | |
3141 | ||
840cb59c | 3142 | health_code_update(); |
86acf0da | 3143 | |
f37d259d MD |
3144 | if (!app->compatible) { |
3145 | /* | |
3146 | * TODO: In time, we should notice the caller of this error by | |
3147 | * telling him that this is a version error. | |
3148 | */ | |
3149 | continue; | |
3150 | } | |
3151 | handle = ustctl_tracepoint_field_list(app->sock); | |
3152 | if (handle < 0) { | |
ffe60014 DG |
3153 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3154 | ERR("UST app list field getting handle failed for app pid %d", | |
3155 | app->pid); | |
3156 | } | |
f37d259d MD |
3157 | continue; |
3158 | } | |
3159 | ||
3160 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3161 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3162 | /* Handle ustctl error. */ |
3163 | if (ret < 0) { | |
3164 | free(tmp_event); | |
151b126b | 3165 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3166 | ERR("UST app tp list field failed for app %d with ret %d", |
3167 | app->sock, ret); | |
3168 | } else { | |
3169 | DBG3("UST app tp list field failed. Application is dead"); | |
47cb9d4a DG |
3170 | /* |
3171 | * This is normal behavior, an application can die during the | |
3172 | * creation process. Don't report an error so the execution can | |
3173 | * continue normally. | |
3174 | */ | |
3175 | break; | |
ffe60014 DG |
3176 | } |
3177 | goto rcu_error; | |
3178 | } | |
3179 | ||
840cb59c | 3180 | health_code_update(); |
f37d259d | 3181 | if (count >= nbmem) { |
d7b3776f | 3182 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3183 | void *ptr; |
3184 | ||
f37d259d MD |
3185 | DBG2("Reallocating event field list from %zu to %zu entries", nbmem, |
3186 | 2 * nbmem); | |
3187 | nbmem *= 2; | |
c617c0c6 MD |
3188 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field)); |
3189 | if (ptr == NULL) { | |
f37d259d | 3190 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3191 | free(tmp_event); |
f37d259d MD |
3192 | ret = -ENOMEM; |
3193 | goto rcu_error; | |
3194 | } | |
c617c0c6 | 3195 | tmp_event = ptr; |
f37d259d | 3196 | } |
f37d259d | 3197 | |
c617c0c6 | 3198 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
13d9b823 DG |
3199 | /* Mapping between these enums matches 1 to 1. */ |
3200 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3201 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3202 | |
c617c0c6 MD |
3203 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3204 | tmp_event[count].event.loglevel = uiter.loglevel; | |
13d9b823 | 3205 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3206 | tmp_event[count].event.pid = app->pid; |
3207 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3208 | count++; |
3209 | } | |
3210 | } | |
3211 | ||
3212 | ret = count; | |
c617c0c6 | 3213 | *fields = tmp_event; |
f37d259d MD |
3214 | |
3215 | DBG2("UST app list event fields done (%zu events)", count); | |
3216 | ||
3217 | rcu_error: | |
3218 | rcu_read_unlock(); | |
3219 | error: | |
840cb59c | 3220 | health_code_update(); |
f37d259d MD |
3221 | return ret; |
3222 | } | |
3223 | ||
5b4a0ec0 DG |
3224 | /* |
3225 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3226 | * |
3227 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3228 | */ |
3229 | void ust_app_clean_list(void) | |
421cb601 | 3230 | { |
5b4a0ec0 | 3231 | int ret; |
659ed79f | 3232 | struct ust_app *app; |
bec39940 | 3233 | struct lttng_ht_iter iter; |
421cb601 | 3234 | |
5b4a0ec0 | 3235 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3236 | |
5b4a0ec0 | 3237 | rcu_read_lock(); |
421cb601 | 3238 | |
659ed79f | 3239 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3240 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3241 | assert(!ret); |
659ed79f | 3242 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3243 | } |
3244 | ||
852d0037 | 3245 | /* Cleanup socket hash table */ |
659ed79f DG |
3246 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3247 | sock_n.node) { | |
852d0037 | 3248 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3249 | assert(!ret); |
3250 | } | |
852d0037 | 3251 | |
d88aee68 DG |
3252 | /* Cleanup notify socket hash table */ |
3253 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3254 | notify_sock_n.node) { | |
3255 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3256 | assert(!ret); | |
3257 | } | |
36b588ed | 3258 | rcu_read_unlock(); |
d88aee68 | 3259 | |
bec39940 | 3260 | /* Destroy is done only when the ht is empty */ |
0b2dc8df MD |
3261 | ht_cleanup_push(ust_app_ht); |
3262 | ht_cleanup_push(ust_app_ht_by_sock); | |
3263 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
5b4a0ec0 DG |
3264 | } |
3265 | ||
3266 | /* | |
3267 | * Init UST app hash table. | |
3268 | */ | |
3269 | void ust_app_ht_alloc(void) | |
3270 | { | |
bec39940 | 3271 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3272 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3273 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3274 | } |
3275 | ||
78f0bacd DG |
3276 | /* |
3277 | * For a specific UST session, disable the channel for all registered apps. | |
3278 | */ | |
35a9059d | 3279 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3280 | struct ltt_ust_channel *uchan) |
3281 | { | |
3282 | int ret = 0; | |
bec39940 DG |
3283 | struct lttng_ht_iter iter; |
3284 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3285 | struct ust_app *app; |
3286 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3287 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3288 | |
3289 | if (usess == NULL || uchan == NULL) { | |
3290 | ERR("Disabling UST global channel with NULL values"); | |
3291 | ret = -1; | |
3292 | goto error; | |
3293 | } | |
3294 | ||
77c5447b | 3295 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3296 | uchan->name, usess->id); |
78f0bacd DG |
3297 | |
3298 | rcu_read_lock(); | |
3299 | ||
3300 | /* For every registered applications */ | |
852d0037 | 3301 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3302 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3303 | if (!app->compatible) { |
3304 | /* | |
3305 | * TODO: In time, we should notice the caller of this error by | |
3306 | * telling him that this is a version error. | |
3307 | */ | |
3308 | continue; | |
3309 | } | |
78f0bacd DG |
3310 | ua_sess = lookup_session_by_app(usess, app); |
3311 | if (ua_sess == NULL) { | |
3312 | continue; | |
3313 | } | |
3314 | ||
8535a6d9 | 3315 | /* Get channel */ |
bec39940 DG |
3316 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3317 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3318 | /* If the session if found for the app, the channel must be there */ |
3319 | assert(ua_chan_node); | |
3320 | ||
3321 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3322 | /* The channel must not be already disabled */ | |
3323 | assert(ua_chan->enabled == 1); | |
3324 | ||
3325 | /* Disable channel onto application */ | |
3326 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3327 | if (ret < 0) { |
3328 | /* XXX: We might want to report this error at some point... */ | |
3329 | continue; | |
3330 | } | |
3331 | } | |
3332 | ||
3333 | rcu_read_unlock(); | |
3334 | ||
3335 | error: | |
3336 | return ret; | |
3337 | } | |
3338 | ||
3339 | /* | |
3340 | * For a specific UST session, enable the channel for all registered apps. | |
3341 | */ | |
35a9059d | 3342 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3343 | struct ltt_ust_channel *uchan) |
3344 | { | |
3345 | int ret = 0; | |
bec39940 | 3346 | struct lttng_ht_iter iter; |
78f0bacd DG |
3347 | struct ust_app *app; |
3348 | struct ust_app_session *ua_sess; | |
3349 | ||
3350 | if (usess == NULL || uchan == NULL) { | |
3351 | ERR("Adding UST global channel to NULL values"); | |
3352 | ret = -1; | |
3353 | goto error; | |
3354 | } | |
3355 | ||
77c5447b | 3356 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3357 | uchan->name, usess->id); |
78f0bacd DG |
3358 | |
3359 | rcu_read_lock(); | |
3360 | ||
3361 | /* For every registered applications */ | |
852d0037 | 3362 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3363 | if (!app->compatible) { |
3364 | /* | |
3365 | * TODO: In time, we should notice the caller of this error by | |
3366 | * telling him that this is a version error. | |
3367 | */ | |
3368 | continue; | |
3369 | } | |
78f0bacd DG |
3370 | ua_sess = lookup_session_by_app(usess, app); |
3371 | if (ua_sess == NULL) { | |
3372 | continue; | |
3373 | } | |
3374 | ||
3375 | /* Enable channel onto application */ | |
3376 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3377 | if (ret < 0) { | |
3378 | /* XXX: We might want to report this error at some point... */ | |
3379 | continue; | |
3380 | } | |
3381 | } | |
3382 | ||
3383 | rcu_read_unlock(); | |
3384 | ||
3385 | error: | |
3386 | return ret; | |
3387 | } | |
3388 | ||
b0a40d28 DG |
3389 | /* |
3390 | * Disable an event in a channel and for a specific session. | |
3391 | */ | |
35a9059d DG |
3392 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3393 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3394 | { |
3395 | int ret = 0; | |
bec39940 DG |
3396 | struct lttng_ht_iter iter, uiter; |
3397 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3398 | struct ust_app *app; |
3399 | struct ust_app_session *ua_sess; | |
3400 | struct ust_app_channel *ua_chan; | |
3401 | struct ust_app_event *ua_event; | |
3402 | ||
3403 | DBG("UST app disabling event %s for all apps in channel " | |
77c5447b MD |
3404 | "%s for session id %" PRIu64, |
3405 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3406 | |
3407 | rcu_read_lock(); | |
3408 | ||
3409 | /* For all registered applications */ | |
852d0037 | 3410 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3411 | if (!app->compatible) { |
3412 | /* | |
3413 | * TODO: In time, we should notice the caller of this error by | |
3414 | * telling him that this is a version error. | |
3415 | */ | |
3416 | continue; | |
3417 | } | |
b0a40d28 DG |
3418 | ua_sess = lookup_session_by_app(usess, app); |
3419 | if (ua_sess == NULL) { | |
3420 | /* Next app */ | |
3421 | continue; | |
3422 | } | |
3423 | ||
3424 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3425 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3426 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3427 | if (ua_chan_node == NULL) { |
77c5447b | 3428 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3429 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3430 | continue; |
3431 | } | |
3432 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3433 | ||
bec39940 DG |
3434 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3435 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3436 | if (ua_event_node == NULL) { |
3437 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3438 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3439 | continue; |
3440 | } | |
3441 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3442 | ||
7f79d3a1 | 3443 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3444 | if (ret < 0) { |
3445 | /* XXX: Report error someday... */ | |
3446 | continue; | |
3447 | } | |
3448 | } | |
3449 | ||
3450 | rcu_read_unlock(); | |
3451 | ||
3452 | return ret; | |
3453 | } | |
3454 | ||
9730260e | 3455 | /* |
edb67388 | 3456 | * For a specific UST session and UST channel, the event for all |
9730260e DG |
3457 | * registered apps. |
3458 | */ | |
35a9059d | 3459 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
9730260e DG |
3460 | struct ltt_ust_channel *uchan) |
3461 | { | |
3462 | int ret = 0; | |
bec39940 DG |
3463 | struct lttng_ht_iter iter, uiter; |
3464 | struct lttng_ht_node_str *ua_chan_node; | |
9730260e DG |
3465 | struct ust_app *app; |
3466 | struct ust_app_session *ua_sess; | |
3467 | struct ust_app_channel *ua_chan; | |
3468 | struct ust_app_event *ua_event; | |
3469 | ||
3470 | DBG("UST app disabling all event for all apps in channel " | |
77c5447b | 3471 | "%s for session id %" PRIu64, uchan->name, usess->id); |
9730260e DG |
3472 | |
3473 | rcu_read_lock(); | |
3474 | ||
3475 | /* For all registered applications */ | |
852d0037 | 3476 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3477 | if (!app->compatible) { |
3478 | /* | |
3479 | * TODO: In time, we should notice the caller of this error by | |
3480 | * telling him that this is a version error. | |
3481 | */ | |
3482 | continue; | |
3483 | } | |
9730260e | 3484 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3485 | if (!ua_sess) { |
3486 | /* The application has problem or is probably dead. */ | |
3487 | continue; | |
3488 | } | |
9730260e DG |
3489 | |
3490 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3491 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3492 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3493 | /* If the channel is not found, there is a code flow error */ |
3494 | assert(ua_chan_node); | |
3495 | ||
9730260e DG |
3496 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3497 | ||
3498 | /* Disable each events of channel */ | |
bec39940 DG |
3499 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3500 | node.node) { | |
7f79d3a1 | 3501 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
9730260e DG |
3502 | if (ret < 0) { |
3503 | /* XXX: Report error someday... */ | |
3504 | continue; | |
3505 | } | |
3506 | } | |
3507 | } | |
3508 | ||
3509 | rcu_read_unlock(); | |
3510 | ||
3511 | return ret; | |
3512 | } | |
3513 | ||
421cb601 | 3514 | /* |
5b4a0ec0 | 3515 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3516 | */ |
35a9059d | 3517 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3518 | struct ltt_ust_channel *uchan) |
3519 | { | |
3d8ca23b | 3520 | int ret = 0, created; |
bec39940 | 3521 | struct lttng_ht_iter iter; |
48842b30 | 3522 | struct ust_app *app; |
3d8ca23b | 3523 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3524 | |
fc34caaa DG |
3525 | /* Very wrong code flow */ |
3526 | assert(usess); | |
3527 | assert(uchan); | |
421cb601 | 3528 | |
77c5447b | 3529 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3530 | uchan->name, usess->id); |
48842b30 DG |
3531 | |
3532 | rcu_read_lock(); | |
421cb601 | 3533 | |
5b4a0ec0 | 3534 | /* For every registered applications */ |
852d0037 | 3535 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3536 | if (!app->compatible) { |
3537 | /* | |
3538 | * TODO: In time, we should notice the caller of this error by | |
3539 | * telling him that this is a version error. | |
3540 | */ | |
3541 | continue; | |
3542 | } | |
edb67388 DG |
3543 | /* |
3544 | * Create session on the tracer side and add it to app session HT. Note | |
3545 | * that if session exist, it will simply return a pointer to the ust | |
3546 | * app session. | |
3547 | */ | |
3d8ca23b DG |
3548 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3549 | if (ret < 0) { | |
3550 | switch (ret) { | |
3551 | case -ENOTCONN: | |
3552 | /* | |
3553 | * The application's socket is not valid. Either a bad socket | |
3554 | * or a timeout on it. We can't inform the caller that for a | |
3555 | * specific app, the session failed so lets continue here. | |
3556 | */ | |
3557 | continue; | |
3558 | case -ENOMEM: | |
3559 | default: | |
3560 | goto error_rcu_unlock; | |
3561 | } | |
48842b30 | 3562 | } |
3d8ca23b | 3563 | assert(ua_sess); |
48842b30 | 3564 | |
d0b96690 | 3565 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3566 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3567 | sizeof(uchan->name))) { | |
3568 | struct ustctl_consumer_channel_attr attr; | |
3569 | copy_channel_attr_to_ustctl(&attr, &uchan->attr); | |
3570 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
3571 | &attr); | |
3572 | } else { | |
3573 | /* Create channel onto application. We don't need the chan ref. */ | |
3574 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3575 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3576 | } | |
d0b96690 | 3577 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3578 | if (ret < 0) { |
3579 | if (ret == -ENOMEM) { | |
3580 | /* No more memory is a fatal error. Stop right now. */ | |
3581 | goto error_rcu_unlock; | |
3582 | } | |
3583 | /* Cleanup the created session if it's the case. */ | |
3584 | if (created) { | |
d0b96690 | 3585 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3586 | } |
48842b30 | 3587 | } |
48842b30 | 3588 | } |
5b4a0ec0 | 3589 | |
95e047ff | 3590 | error_rcu_unlock: |
48842b30 | 3591 | rcu_read_unlock(); |
3c14c33f | 3592 | return ret; |
48842b30 DG |
3593 | } |
3594 | ||
5b4a0ec0 | 3595 | /* |
edb67388 | 3596 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3597 | */ |
35a9059d | 3598 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3599 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3600 | { | |
3601 | int ret = 0; | |
bec39940 | 3602 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3603 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3604 | struct ust_app *app; |
3605 | struct ust_app_session *ua_sess; | |
3606 | struct ust_app_channel *ua_chan; | |
3607 | struct ust_app_event *ua_event; | |
48842b30 | 3608 | |
77c5447b | 3609 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3610 | uevent->attr.name, usess->id); |
48842b30 | 3611 | |
edb67388 DG |
3612 | /* |
3613 | * NOTE: At this point, this function is called only if the session and | |
3614 | * channel passed are already created for all apps. and enabled on the | |
3615 | * tracer also. | |
3616 | */ | |
3617 | ||
48842b30 | 3618 | rcu_read_lock(); |
421cb601 DG |
3619 | |
3620 | /* For all registered applications */ | |
852d0037 | 3621 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3622 | if (!app->compatible) { |
3623 | /* | |
3624 | * TODO: In time, we should notice the caller of this error by | |
3625 | * telling him that this is a version error. | |
3626 | */ | |
3627 | continue; | |
3628 | } | |
edb67388 | 3629 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3630 | if (!ua_sess) { |
3631 | /* The application has problem or is probably dead. */ | |
3632 | continue; | |
3633 | } | |
ba767faf | 3634 | |
d0b96690 DG |
3635 | pthread_mutex_lock(&ua_sess->lock); |
3636 | ||
edb67388 | 3637 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3638 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3639 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3640 | /* If the channel is not found, there is a code flow error */ |
3641 | assert(ua_chan_node); | |
3642 | ||
3643 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3644 | ||
18eace3b DG |
3645 | /* Get event node */ |
3646 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
3647 | uevent->filter, uevent->attr.loglevel); | |
3648 | if (ua_event == NULL) { | |
7f79d3a1 | 3649 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3650 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3651 | goto next_app; |
35a9059d | 3652 | } |
35a9059d DG |
3653 | |
3654 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3655 | if (ret < 0) { | |
d0b96690 | 3656 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3657 | goto error; |
48842b30 | 3658 | } |
d0b96690 DG |
3659 | next_app: |
3660 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3661 | } |
3662 | ||
7f79d3a1 | 3663 | error: |
edb67388 | 3664 | rcu_read_unlock(); |
edb67388 DG |
3665 | return ret; |
3666 | } | |
3667 | ||
3668 | /* | |
3669 | * For a specific existing UST session and UST channel, creates the event for | |
3670 | * all registered apps. | |
3671 | */ | |
35a9059d | 3672 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3673 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3674 | { | |
3675 | int ret = 0; | |
bec39940 DG |
3676 | struct lttng_ht_iter iter, uiter; |
3677 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3678 | struct ust_app *app; |
3679 | struct ust_app_session *ua_sess; | |
3680 | struct ust_app_channel *ua_chan; | |
3681 | ||
77c5447b | 3682 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3683 | uevent->attr.name, usess->id); |
edb67388 | 3684 | |
edb67388 DG |
3685 | rcu_read_lock(); |
3686 | ||
3687 | /* For all registered applications */ | |
852d0037 | 3688 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3689 | if (!app->compatible) { |
3690 | /* | |
3691 | * TODO: In time, we should notice the caller of this error by | |
3692 | * telling him that this is a version error. | |
3693 | */ | |
3694 | continue; | |
3695 | } | |
edb67388 | 3696 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3697 | if (!ua_sess) { |
3698 | /* The application has problem or is probably dead. */ | |
3699 | continue; | |
3700 | } | |
48842b30 | 3701 | |
d0b96690 | 3702 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3703 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3704 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3705 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3706 | /* If the channel is not found, there is a code flow error */ |
3707 | assert(ua_chan_node); | |
3708 | ||
48842b30 DG |
3709 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3710 | ||
edb67388 | 3711 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3712 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3713 | if (ret < 0) { |
49c336c1 | 3714 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3715 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3716 | break; | |
3717 | } | |
3718 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3719 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3720 | continue; |
48842b30 | 3721 | } |
48842b30 | 3722 | } |
5b4a0ec0 | 3723 | |
48842b30 DG |
3724 | rcu_read_unlock(); |
3725 | ||
3726 | return ret; | |
3727 | } | |
3728 | ||
5b4a0ec0 DG |
3729 | /* |
3730 | * Start tracing for a specific UST session and app. | |
3731 | */ | |
b34cbebf | 3732 | static |
421cb601 | 3733 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3734 | { |
3735 | int ret = 0; | |
48842b30 | 3736 | struct ust_app_session *ua_sess; |
48842b30 | 3737 | |
852d0037 | 3738 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3739 | |
509cbaf8 MD |
3740 | rcu_read_lock(); |
3741 | ||
e0c7ec2b DG |
3742 | if (!app->compatible) { |
3743 | goto end; | |
3744 | } | |
3745 | ||
421cb601 DG |
3746 | ua_sess = lookup_session_by_app(usess, app); |
3747 | if (ua_sess == NULL) { | |
d42f20df DG |
3748 | /* The session is in teardown process. Ignore and continue. */ |
3749 | goto end; | |
421cb601 | 3750 | } |
48842b30 | 3751 | |
d0b96690 DG |
3752 | pthread_mutex_lock(&ua_sess->lock); |
3753 | ||
aea829b3 DG |
3754 | /* Upon restart, we skip the setup, already done */ |
3755 | if (ua_sess->started) { | |
8be98f9a | 3756 | goto skip_setup; |
aea829b3 | 3757 | } |
8be98f9a | 3758 | |
a4b92340 DG |
3759 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3760 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3761 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3762 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3763 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3764 | if (ret < 0) { |
3765 | if (ret != -EEXIST) { | |
3766 | ERR("Trace directory creation error"); | |
d0b96690 | 3767 | goto error_unlock; |
421cb601 | 3768 | } |
173af62f | 3769 | } |
7753dea8 | 3770 | } |
aea829b3 | 3771 | |
d65d2de8 DG |
3772 | /* |
3773 | * Create the metadata for the application. This returns gracefully if a | |
3774 | * metadata was already set for the session. | |
3775 | */ | |
3776 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, NULL); | |
421cb601 | 3777 | if (ret < 0) { |
d0b96690 | 3778 | goto error_unlock; |
421cb601 | 3779 | } |
48842b30 | 3780 | |
840cb59c | 3781 | health_code_update(); |
86acf0da | 3782 | |
8be98f9a | 3783 | skip_setup: |
421cb601 | 3784 | /* This start the UST tracing */ |
852d0037 | 3785 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3786 | if (ret < 0) { |
ffe60014 DG |
3787 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3788 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3789 | app->pid, ret); | |
3790 | } else { | |
3791 | DBG("UST app start session failed. Application is dead."); | |
47cb9d4a DG |
3792 | /* |
3793 | * This is normal behavior, an application can die during the | |
3794 | * creation process. Don't report an error so the execution can | |
3795 | * continue normally. | |
3796 | */ | |
3797 | pthread_mutex_unlock(&ua_sess->lock); | |
3798 | goto end; | |
ffe60014 | 3799 | } |
d0b96690 | 3800 | goto error_unlock; |
421cb601 | 3801 | } |
5b4a0ec0 | 3802 | |
55c3953d DG |
3803 | /* Indicate that the session has been started once */ |
3804 | ua_sess->started = 1; | |
3805 | ||
d0b96690 DG |
3806 | pthread_mutex_unlock(&ua_sess->lock); |
3807 | ||
840cb59c | 3808 | health_code_update(); |
86acf0da | 3809 | |
421cb601 | 3810 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3811 | ret = ustctl_wait_quiescent(app->sock); |
3812 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3813 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3814 | app->pid, ret); | |
3815 | } | |
48842b30 | 3816 | |
e0c7ec2b DG |
3817 | end: |
3818 | rcu_read_unlock(); | |
840cb59c | 3819 | health_code_update(); |
421cb601 | 3820 | return 0; |
48842b30 | 3821 | |
d0b96690 DG |
3822 | error_unlock: |
3823 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3824 | rcu_read_unlock(); |
840cb59c | 3825 | health_code_update(); |
421cb601 DG |
3826 | return -1; |
3827 | } | |
48842b30 | 3828 | |
8be98f9a MD |
3829 | /* |
3830 | * Stop tracing for a specific UST session and app. | |
3831 | */ | |
b34cbebf | 3832 | static |
8be98f9a MD |
3833 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3834 | { | |
3835 | int ret = 0; | |
3836 | struct ust_app_session *ua_sess; | |
7972aab2 | 3837 | struct ust_registry_session *registry; |
8be98f9a | 3838 | |
852d0037 | 3839 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3840 | |
3841 | rcu_read_lock(); | |
3842 | ||
e0c7ec2b | 3843 | if (!app->compatible) { |
d88aee68 | 3844 | goto end_no_session; |
e0c7ec2b DG |
3845 | } |
3846 | ||
8be98f9a MD |
3847 | ua_sess = lookup_session_by_app(usess, app); |
3848 | if (ua_sess == NULL) { | |
d88aee68 | 3849 | goto end_no_session; |
8be98f9a MD |
3850 | } |
3851 | ||
d88aee68 DG |
3852 | pthread_mutex_lock(&ua_sess->lock); |
3853 | ||
9bc07046 DG |
3854 | /* |
3855 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3856 | * that was never started. It's possible since we can have a fail start |
3857 | * from either the application manager thread or the command thread. Simply | |
3858 | * indicate that this is a stop error. | |
9bc07046 | 3859 | */ |
f9dfc3d9 | 3860 | if (!ua_sess->started) { |
c45536e1 DG |
3861 | goto error_rcu_unlock; |
3862 | } | |
7db205b5 | 3863 | |
840cb59c | 3864 | health_code_update(); |
86acf0da | 3865 | |
9d6c7d3f | 3866 | /* This inhibits UST tracing */ |
852d0037 | 3867 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3868 | if (ret < 0) { |
ffe60014 DG |
3869 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3870 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3871 | app->pid, ret); | |
3872 | } else { | |
3873 | DBG("UST app stop session failed. Application is dead."); | |
47cb9d4a DG |
3874 | /* |
3875 | * This is normal behavior, an application can die during the | |
3876 | * creation process. Don't report an error so the execution can | |
3877 | * continue normally. | |
3878 | */ | |
3879 | goto end_unlock; | |
ffe60014 | 3880 | } |
9d6c7d3f DG |
3881 | goto error_rcu_unlock; |
3882 | } | |
3883 | ||
840cb59c | 3884 | health_code_update(); |
86acf0da | 3885 | |
9d6c7d3f | 3886 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3887 | ret = ustctl_wait_quiescent(app->sock); |
3888 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3889 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3890 | app->pid, ret); | |
3891 | } | |
9d6c7d3f | 3892 | |
840cb59c | 3893 | health_code_update(); |
86acf0da | 3894 | |
b34cbebf MD |
3895 | registry = get_session_registry(ua_sess); |
3896 | assert(registry); | |
1b532a60 DG |
3897 | |
3898 | if (!registry->metadata_closed) { | |
3899 | /* Push metadata for application before freeing the application. */ | |
3900 | (void) push_metadata(registry, ua_sess->consumer); | |
3901 | } | |
b34cbebf | 3902 | |
47cb9d4a | 3903 | end_unlock: |
b34cbebf MD |
3904 | pthread_mutex_unlock(&ua_sess->lock); |
3905 | end_no_session: | |
3906 | rcu_read_unlock(); | |
3907 | health_code_update(); | |
3908 | return 0; | |
3909 | ||
3910 | error_rcu_unlock: | |
3911 | pthread_mutex_unlock(&ua_sess->lock); | |
3912 | rcu_read_unlock(); | |
3913 | health_code_update(); | |
3914 | return -1; | |
3915 | } | |
3916 | ||
3917 | /* | |
3918 | * Flush buffers for a specific UST session and app. | |
3919 | */ | |
3920 | static | |
3921 | int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
3922 | { | |
3923 | int ret = 0; | |
3924 | struct lttng_ht_iter iter; | |
3925 | struct ust_app_session *ua_sess; | |
3926 | struct ust_app_channel *ua_chan; | |
3927 | ||
3928 | DBG("Flushing buffers for ust app pid %d", app->pid); | |
3929 | ||
3930 | rcu_read_lock(); | |
3931 | ||
3932 | if (!app->compatible) { | |
3933 | goto end_no_session; | |
3934 | } | |
3935 | ||
3936 | ua_sess = lookup_session_by_app(usess, app); | |
3937 | if (ua_sess == NULL) { | |
3938 | goto end_no_session; | |
3939 | } | |
3940 | ||
3941 | pthread_mutex_lock(&ua_sess->lock); | |
3942 | ||
3943 | health_code_update(); | |
3944 | ||
9d6c7d3f | 3945 | /* Flushing buffers */ |
bec39940 DG |
3946 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
3947 | node.node) { | |
840cb59c | 3948 | health_code_update(); |
ffe60014 | 3949 | assert(ua_chan->is_sent); |
852d0037 | 3950 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 3951 | if (ret < 0) { |
ffe60014 DG |
3952 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3953 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
3954 | app->pid, ua_chan->name, ret); | |
3955 | } else { | |
3956 | DBG3("UST app failed to flush %s. Application is dead.", | |
3957 | ua_chan->name); | |
47cb9d4a DG |
3958 | /* |
3959 | * This is normal behavior, an application can die during the | |
3960 | * creation process. Don't report an error so the execution can | |
3961 | * continue normally. | |
3962 | */ | |
ffe60014 | 3963 | } |
6d3686da DG |
3964 | /* Continuing flushing all buffers */ |
3965 | continue; | |
8be98f9a MD |
3966 | } |
3967 | } | |
8be98f9a | 3968 | |
840cb59c | 3969 | health_code_update(); |
86acf0da | 3970 | |
d88aee68 DG |
3971 | pthread_mutex_unlock(&ua_sess->lock); |
3972 | end_no_session: | |
7db205b5 | 3973 | rcu_read_unlock(); |
840cb59c | 3974 | health_code_update(); |
8be98f9a | 3975 | return 0; |
8be98f9a MD |
3976 | } |
3977 | ||
84cd17c6 MD |
3978 | /* |
3979 | * Destroy a specific UST session in apps. | |
3980 | */ | |
3353de95 | 3981 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 3982 | { |
ffe60014 | 3983 | int ret; |
84cd17c6 | 3984 | struct ust_app_session *ua_sess; |
bec39940 | 3985 | struct lttng_ht_iter iter; |
77c5447b | 3986 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 3987 | |
852d0037 | 3988 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
3989 | |
3990 | rcu_read_lock(); | |
3991 | ||
e0c7ec2b DG |
3992 | if (!app->compatible) { |
3993 | goto end; | |
3994 | } | |
3995 | ||
84cd17c6 | 3996 | __lookup_session_by_app(usess, app, &iter); |
77c5447b | 3997 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 3998 | if (node == NULL) { |
d42f20df DG |
3999 | /* Session is being or is deleted. */ |
4000 | goto end; | |
84cd17c6 MD |
4001 | } |
4002 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4003 | |
840cb59c | 4004 | health_code_update(); |
d0b96690 | 4005 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4006 | |
840cb59c | 4007 | health_code_update(); |
7db205b5 | 4008 | |
84cd17c6 | 4009 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
4010 | ret = ustctl_wait_quiescent(app->sock); |
4011 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4012 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4013 | app->pid, ret); | |
4014 | } | |
e0c7ec2b DG |
4015 | end: |
4016 | rcu_read_unlock(); | |
840cb59c | 4017 | health_code_update(); |
84cd17c6 | 4018 | return 0; |
84cd17c6 MD |
4019 | } |
4020 | ||
5b4a0ec0 DG |
4021 | /* |
4022 | * Start tracing for the UST session. | |
4023 | */ | |
421cb601 DG |
4024 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4025 | { | |
4026 | int ret = 0; | |
bec39940 | 4027 | struct lttng_ht_iter iter; |
421cb601 | 4028 | struct ust_app *app; |
48842b30 | 4029 | |
421cb601 DG |
4030 | DBG("Starting all UST traces"); |
4031 | ||
4032 | rcu_read_lock(); | |
421cb601 | 4033 | |
852d0037 | 4034 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4035 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4036 | if (ret < 0) { |
5b4a0ec0 DG |
4037 | /* Continue to next apps even on error */ |
4038 | continue; | |
48842b30 | 4039 | } |
48842b30 | 4040 | } |
5b4a0ec0 | 4041 | |
48842b30 DG |
4042 | rcu_read_unlock(); |
4043 | ||
4044 | return 0; | |
4045 | } | |
487cf67c | 4046 | |
8be98f9a MD |
4047 | /* |
4048 | * Start tracing for the UST session. | |
4049 | */ | |
4050 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4051 | { | |
4052 | int ret = 0; | |
bec39940 | 4053 | struct lttng_ht_iter iter; |
8be98f9a MD |
4054 | struct ust_app *app; |
4055 | ||
4056 | DBG("Stopping all UST traces"); | |
4057 | ||
4058 | rcu_read_lock(); | |
4059 | ||
b34cbebf MD |
4060 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4061 | ret = ust_app_stop_trace(usess, app); | |
4062 | if (ret < 0) { | |
4063 | /* Continue to next apps even on error */ | |
4064 | continue; | |
4065 | } | |
4066 | } | |
4067 | ||
5e674ece | 4068 | /* Flush buffers and push metadata (for UID buffers). */ |
b34cbebf MD |
4069 | switch (usess->buffer_type) { |
4070 | case LTTNG_BUFFER_PER_UID: | |
4071 | { | |
7972aab2 | 4072 | struct buffer_reg_uid *reg; |
b34cbebf MD |
4073 | |
4074 | /* Flush all per UID buffers associated to that session. */ | |
7972aab2 | 4075 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5e674ece | 4076 | struct ust_registry_session *ust_session_reg; |
7972aab2 DG |
4077 | struct buffer_reg_channel *reg_chan; |
4078 | struct consumer_socket *socket; | |
4079 | ||
4080 | /* Get consumer socket to use to push the metadata.*/ | |
4081 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4082 | usess->consumer); | |
4083 | if (!socket) { | |
4084 | /* Ignore request if no consumer is found for the session. */ | |
4085 | continue; | |
4086 | } | |
4087 | ||
4088 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4089 | reg_chan, node.node) { | |
4090 | /* | |
4091 | * The following call will print error values so the return | |
4092 | * code is of little importance because whatever happens, we | |
4093 | * have to try them all. | |
4094 | */ | |
4095 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4096 | } | |
5e674ece MD |
4097 | |
4098 | ust_session_reg = reg->registry->reg.ust; | |
4099 | if (!ust_session_reg->metadata_closed) { | |
4100 | /* Push metadata. */ | |
4101 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4102 | } | |
7972aab2 | 4103 | } |
5e674ece | 4104 | |
b34cbebf | 4105 | break; |
7972aab2 | 4106 | } |
b34cbebf MD |
4107 | case LTTNG_BUFFER_PER_PID: |
4108 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4109 | ret = ust_app_flush_trace(usess, app); | |
4110 | if (ret < 0) { | |
4111 | /* Continue to next apps even on error */ | |
4112 | continue; | |
4113 | } | |
8be98f9a | 4114 | } |
b34cbebf MD |
4115 | break; |
4116 | default: | |
4117 | assert(0); | |
4118 | break; | |
8be98f9a MD |
4119 | } |
4120 | ||
4121 | rcu_read_unlock(); | |
4122 | ||
4123 | return 0; | |
4124 | } | |
4125 | ||
84cd17c6 MD |
4126 | /* |
4127 | * Destroy app UST session. | |
4128 | */ | |
4129 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4130 | { | |
4131 | int ret = 0; | |
bec39940 | 4132 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4133 | struct ust_app *app; |
4134 | ||
4135 | DBG("Destroy all UST traces"); | |
4136 | ||
4137 | rcu_read_lock(); | |
4138 | ||
852d0037 | 4139 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4140 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4141 | if (ret < 0) { |
4142 | /* Continue to next apps even on error */ | |
4143 | continue; | |
4144 | } | |
4145 | } | |
4146 | ||
4147 | rcu_read_unlock(); | |
4148 | ||
4149 | return 0; | |
4150 | } | |
4151 | ||
5b4a0ec0 DG |
4152 | /* |
4153 | * Add channels/events from UST global domain to registered apps at sock. | |
4154 | */ | |
487cf67c DG |
4155 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4156 | { | |
55c54cce | 4157 | int ret = 0; |
4623416f | 4158 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4159 | struct ust_app *app; |
3d8ca23b | 4160 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4161 | struct ust_app_channel *ua_chan; |
4162 | struct ust_app_event *ua_event; | |
727d5404 | 4163 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4164 | |
95e047ff | 4165 | assert(usess); |
ffe60014 | 4166 | assert(sock >= 0); |
1f3580c7 | 4167 | |
77c5447b | 4168 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4169 | usess->id); |
487cf67c | 4170 | |
284d8f55 DG |
4171 | rcu_read_lock(); |
4172 | ||
487cf67c DG |
4173 | app = find_app_by_sock(sock); |
4174 | if (app == NULL) { | |
d88aee68 DG |
4175 | /* |
4176 | * Application can be unregistered before so this is possible hence | |
4177 | * simply stopping the update. | |
4178 | */ | |
4179 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4180 | goto error; |
4181 | } | |
4182 | ||
e0c7ec2b DG |
4183 | if (!app->compatible) { |
4184 | goto error; | |
4185 | } | |
4186 | ||
3d8ca23b DG |
4187 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4188 | if (ret < 0) { | |
4189 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4190 | goto error; |
4191 | } | |
3d8ca23b | 4192 | assert(ua_sess); |
487cf67c | 4193 | |
d0b96690 DG |
4194 | pthread_mutex_lock(&ua_sess->lock); |
4195 | ||
284d8f55 | 4196 | /* |
d0b96690 | 4197 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4198 | * app session above made a shadow copy of the UST global domain from the |
4199 | * ltt ust session. | |
4200 | */ | |
bec39940 DG |
4201 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4202 | node.node) { | |
d65d2de8 DG |
4203 | /* |
4204 | * For a metadata channel, handle it differently. | |
4205 | */ | |
4206 | if (!strncmp(ua_chan->name, DEFAULT_METADATA_NAME, | |
4207 | sizeof(ua_chan->name))) { | |
4208 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
4209 | &ua_chan->attr); | |
c7a339aa DG |
4210 | if (ret < 0) { |
4211 | goto error_unlock; | |
4212 | } | |
d65d2de8 DG |
4213 | /* Remove it from the hash table and continue!. */ |
4214 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
4215 | assert(!ret); | |
4216 | delete_ust_app_channel(-1, ua_chan, app); | |
4217 | continue; | |
4218 | } else { | |
4219 | ret = do_create_channel(app, usess, ua_sess, ua_chan); | |
c7a339aa DG |
4220 | if (ret < 0) { |
4221 | /* | |
4222 | * Stop everything. On error, the application failed, no more | |
4223 | * file descriptor are available or ENOMEM so stopping here is | |
4224 | * the only thing we can do for now. | |
4225 | */ | |
4226 | goto error_unlock; | |
4227 | } | |
487cf67c DG |
4228 | } |
4229 | ||
4623416f DG |
4230 | /* |
4231 | * Add context using the list so they are enabled in the same order the | |
4232 | * user added them. | |
4233 | */ | |
4234 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4235 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4236 | if (ret < 0) { | |
d0b96690 | 4237 | goto error_unlock; |
727d5404 DG |
4238 | } |
4239 | } | |
4240 | ||
4241 | ||
284d8f55 | 4242 | /* For each events */ |
bec39940 DG |
4243 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4244 | node.node) { | |
284d8f55 DG |
4245 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4246 | if (ret < 0) { | |
d0b96690 | 4247 | goto error_unlock; |
487cf67c | 4248 | } |
36dc12cc | 4249 | } |
487cf67c DG |
4250 | } |
4251 | ||
d0b96690 DG |
4252 | pthread_mutex_unlock(&ua_sess->lock); |
4253 | ||
36dc12cc | 4254 | if (usess->start_trace) { |
421cb601 | 4255 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4256 | if (ret < 0) { |
36dc12cc DG |
4257 | goto error; |
4258 | } | |
4259 | ||
852d0037 | 4260 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4261 | } |
4262 | ||
ffe60014 DG |
4263 | /* Everything went well at this point. */ |
4264 | rcu_read_unlock(); | |
4265 | return; | |
4266 | ||
d0b96690 DG |
4267 | error_unlock: |
4268 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4269 | error: |
ffe60014 | 4270 | if (ua_sess) { |
d0b96690 | 4271 | destroy_app_session(app, ua_sess); |
ffe60014 | 4272 | } |
487cf67c DG |
4273 | rcu_read_unlock(); |
4274 | return; | |
4275 | } | |
55cc08a6 DG |
4276 | |
4277 | /* | |
4278 | * Add context to a specific channel for global UST domain. | |
4279 | */ | |
4280 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4281 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4282 | { | |
4283 | int ret = 0; | |
bec39940 DG |
4284 | struct lttng_ht_node_str *ua_chan_node; |
4285 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4286 | struct ust_app_channel *ua_chan = NULL; |
4287 | struct ust_app_session *ua_sess; | |
4288 | struct ust_app *app; | |
4289 | ||
4290 | rcu_read_lock(); | |
4291 | ||
852d0037 | 4292 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4293 | if (!app->compatible) { |
4294 | /* | |
4295 | * TODO: In time, we should notice the caller of this error by | |
4296 | * telling him that this is a version error. | |
4297 | */ | |
4298 | continue; | |
4299 | } | |
55cc08a6 DG |
4300 | ua_sess = lookup_session_by_app(usess, app); |
4301 | if (ua_sess == NULL) { | |
4302 | continue; | |
4303 | } | |
4304 | ||
d0b96690 | 4305 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4306 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4307 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4308 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4309 | if (ua_chan_node == NULL) { |
d0b96690 | 4310 | goto next_app; |
55cc08a6 DG |
4311 | } |
4312 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4313 | node); | |
55cc08a6 DG |
4314 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4315 | if (ret < 0) { | |
d0b96690 | 4316 | goto next_app; |
55cc08a6 | 4317 | } |
d0b96690 DG |
4318 | next_app: |
4319 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4320 | } |
4321 | ||
55cc08a6 DG |
4322 | rcu_read_unlock(); |
4323 | return ret; | |
4324 | } | |
4325 | ||
76d45b40 DG |
4326 | /* |
4327 | * Enable event for a channel from a UST session for a specific PID. | |
4328 | */ | |
4329 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4330 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4331 | { | |
4332 | int ret = 0; | |
bec39940 | 4333 | struct lttng_ht_iter iter; |
18eace3b | 4334 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4335 | struct ust_app *app; |
4336 | struct ust_app_session *ua_sess; | |
4337 | struct ust_app_channel *ua_chan; | |
4338 | struct ust_app_event *ua_event; | |
4339 | ||
4340 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4341 | ||
4342 | rcu_read_lock(); | |
4343 | ||
4344 | app = ust_app_find_by_pid(pid); | |
4345 | if (app == NULL) { | |
4346 | ERR("UST app enable event per PID %d not found", pid); | |
4347 | ret = -1; | |
d0b96690 | 4348 | goto end; |
76d45b40 DG |
4349 | } |
4350 | ||
e0c7ec2b DG |
4351 | if (!app->compatible) { |
4352 | ret = 0; | |
d0b96690 | 4353 | goto end; |
e0c7ec2b DG |
4354 | } |
4355 | ||
76d45b40 | 4356 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4357 | if (!ua_sess) { |
4358 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4359 | ret = 0; |
4360 | goto end; | |
c4a1715b | 4361 | } |
76d45b40 | 4362 | |
d0b96690 | 4363 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4364 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4365 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4366 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4367 | /* If the channel is not found, there is a code flow error */ |
4368 | assert(ua_chan_node); | |
4369 | ||
4370 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4371 | ||
18eace3b DG |
4372 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4373 | uevent->filter, uevent->attr.loglevel); | |
4374 | if (ua_event == NULL) { | |
76d45b40 DG |
4375 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4376 | if (ret < 0) { | |
d0b96690 | 4377 | goto end_unlock; |
76d45b40 DG |
4378 | } |
4379 | } else { | |
76d45b40 DG |
4380 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4381 | if (ret < 0) { | |
d0b96690 | 4382 | goto end_unlock; |
76d45b40 DG |
4383 | } |
4384 | } | |
4385 | ||
d0b96690 DG |
4386 | end_unlock: |
4387 | pthread_mutex_unlock(&ua_sess->lock); | |
4388 | end: | |
76d45b40 DG |
4389 | rcu_read_unlock(); |
4390 | return ret; | |
4391 | } | |
7f79d3a1 DG |
4392 | |
4393 | /* | |
4394 | * Disable event for a channel from a UST session for a specific PID. | |
4395 | */ | |
4396 | int ust_app_disable_event_pid(struct ltt_ust_session *usess, | |
4397 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4398 | { | |
4399 | int ret = 0; | |
bec39940 DG |
4400 | struct lttng_ht_iter iter; |
4401 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
7f79d3a1 DG |
4402 | struct ust_app *app; |
4403 | struct ust_app_session *ua_sess; | |
4404 | struct ust_app_channel *ua_chan; | |
4405 | struct ust_app_event *ua_event; | |
4406 | ||
4407 | DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); | |
4408 | ||
4409 | rcu_read_lock(); | |
4410 | ||
4411 | app = ust_app_find_by_pid(pid); | |
4412 | if (app == NULL) { | |
4413 | ERR("UST app disable event per PID %d not found", pid); | |
4414 | ret = -1; | |
4415 | goto error; | |
4416 | } | |
4417 | ||
e0c7ec2b DG |
4418 | if (!app->compatible) { |
4419 | ret = 0; | |
4420 | goto error; | |
4421 | } | |
4422 | ||
7f79d3a1 | 4423 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4424 | if (!ua_sess) { |
4425 | /* The application has problem or is probably dead. */ | |
4426 | goto error; | |
4427 | } | |
7f79d3a1 DG |
4428 | |
4429 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4430 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4431 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4432 | if (ua_chan_node == NULL) { |
4433 | /* Channel does not exist, skip disabling */ | |
4434 | goto error; | |
4435 | } | |
4436 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4437 | ||
bec39940 DG |
4438 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); |
4439 | ua_event_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4440 | if (ua_event_node == NULL) { |
4441 | /* Event does not exist, skip disabling */ | |
4442 | goto error; | |
4443 | } | |
4444 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
4445 | ||
4446 | ret = disable_ust_app_event(ua_sess, ua_event, app); | |
4447 | if (ret < 0) { | |
4448 | goto error; | |
4449 | } | |
4450 | ||
4451 | error: | |
4452 | rcu_read_unlock(); | |
4453 | return ret; | |
4454 | } | |
e0c7ec2b | 4455 | |
4466912f DG |
4456 | /* |
4457 | * Calibrate registered applications. | |
4458 | */ | |
4459 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4460 | { | |
4461 | int ret = 0; | |
4462 | struct lttng_ht_iter iter; | |
4463 | struct ust_app *app; | |
4464 | ||
4465 | rcu_read_lock(); | |
4466 | ||
852d0037 | 4467 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4468 | if (!app->compatible) { |
4469 | /* | |
4470 | * TODO: In time, we should notice the caller of this error by | |
4471 | * telling him that this is a version error. | |
4472 | */ | |
4473 | continue; | |
4474 | } | |
4475 | ||
840cb59c | 4476 | health_code_update(); |
86acf0da | 4477 | |
852d0037 | 4478 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4479 | if (ret < 0) { |
4480 | switch (ret) { | |
4481 | case -ENOSYS: | |
4482 | /* Means that it's not implemented on the tracer side. */ | |
4483 | ret = 0; | |
4484 | break; | |
4485 | default: | |
4466912f | 4486 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4487 | app->pid, ret); |
4466912f DG |
4488 | break; |
4489 | } | |
4490 | } | |
4491 | } | |
4492 | ||
4493 | DBG("UST app global domain calibration finished"); | |
4494 | ||
4495 | rcu_read_unlock(); | |
4496 | ||
840cb59c | 4497 | health_code_update(); |
86acf0da | 4498 | |
4466912f DG |
4499 | return ret; |
4500 | } | |
d0b96690 DG |
4501 | |
4502 | /* | |
4503 | * Receive registration and populate the given msg structure. | |
4504 | * | |
4505 | * On success return 0 else a negative value returned by the ustctl call. | |
4506 | */ | |
4507 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4508 | { | |
4509 | int ret; | |
4510 | uint32_t pid, ppid, uid, gid; | |
4511 | ||
4512 | assert(msg); | |
4513 | ||
4514 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4515 | &pid, &ppid, &uid, &gid, | |
4516 | &msg->bits_per_long, | |
4517 | &msg->uint8_t_alignment, | |
4518 | &msg->uint16_t_alignment, | |
4519 | &msg->uint32_t_alignment, | |
4520 | &msg->uint64_t_alignment, | |
4521 | &msg->long_alignment, | |
4522 | &msg->byte_order, | |
4523 | msg->name); | |
4524 | if (ret < 0) { | |
4525 | switch (-ret) { | |
4526 | case EPIPE: | |
4527 | case ECONNRESET: | |
4528 | case LTTNG_UST_ERR_EXITING: | |
4529 | DBG3("UST app recv reg message failed. Application died"); | |
4530 | break; | |
4531 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4532 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4533 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4534 | LTTNG_UST_ABI_MINOR_VERSION); | |
4535 | break; | |
4536 | default: | |
4537 | ERR("UST app recv reg message failed with ret %d", ret); | |
4538 | break; | |
4539 | } | |
4540 | goto error; | |
4541 | } | |
4542 | msg->pid = (pid_t) pid; | |
4543 | msg->ppid = (pid_t) ppid; | |
4544 | msg->uid = (uid_t) uid; | |
4545 | msg->gid = (gid_t) gid; | |
4546 | ||
4547 | error: | |
4548 | return ret; | |
4549 | } | |
4550 | ||
d88aee68 DG |
4551 | /* |
4552 | * Return a ust app channel object using the application object and the channel | |
4553 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4554 | * lock MUST be acquired before calling this function. | |
4555 | */ | |
d0b96690 DG |
4556 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4557 | int objd) | |
4558 | { | |
4559 | struct lttng_ht_node_ulong *node; | |
4560 | struct lttng_ht_iter iter; | |
4561 | struct ust_app_channel *ua_chan = NULL; | |
4562 | ||
4563 | assert(app); | |
4564 | ||
4565 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4566 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4567 | if (node == NULL) { | |
4568 | DBG2("UST app channel find by objd %d not found", objd); | |
4569 | goto error; | |
4570 | } | |
4571 | ||
4572 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4573 | ||
4574 | error: | |
4575 | return ua_chan; | |
4576 | } | |
4577 | ||
d88aee68 DG |
4578 | /* |
4579 | * Reply to a register channel notification from an application on the notify | |
4580 | * socket. The channel metadata is also created. | |
4581 | * | |
4582 | * The session UST registry lock is acquired in this function. | |
4583 | * | |
4584 | * On success 0 is returned else a negative value. | |
4585 | */ | |
d0b96690 DG |
4586 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4587 | size_t nr_fields, struct ustctl_field *fields) | |
4588 | { | |
4589 | int ret, ret_code = 0; | |
4590 | uint32_t chan_id, reg_count; | |
7972aab2 | 4591 | uint64_t chan_reg_key; |
d0b96690 DG |
4592 | enum ustctl_channel_header type; |
4593 | struct ust_app *app; | |
4594 | struct ust_app_channel *ua_chan; | |
4595 | struct ust_app_session *ua_sess; | |
7972aab2 | 4596 | struct ust_registry_session *registry; |
45893984 | 4597 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4598 | |
4599 | rcu_read_lock(); | |
4600 | ||
4601 | /* Lookup application. If not found, there is a code flow error. */ | |
4602 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4603 | if (!app) { |
4604 | DBG("Application socket %d is being teardown. Abort event notify", | |
4605 | sock); | |
4606 | ret = 0; | |
d5d629b5 | 4607 | free(fields); |
d88aee68 DG |
4608 | goto error_rcu_unlock; |
4609 | } | |
d0b96690 | 4610 | |
4950b860 | 4611 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4612 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4613 | if (!ua_chan) { |
4614 | DBG("Application channel is being teardown. Abort event notify"); | |
4615 | ret = 0; | |
d5d629b5 | 4616 | free(fields); |
4950b860 MD |
4617 | goto error_rcu_unlock; |
4618 | } | |
4619 | ||
d0b96690 DG |
4620 | assert(ua_chan->session); |
4621 | ua_sess = ua_chan->session; | |
d0b96690 | 4622 | |
7972aab2 DG |
4623 | /* Get right session registry depending on the session buffer type. */ |
4624 | registry = get_session_registry(ua_sess); | |
4625 | assert(registry); | |
45893984 | 4626 | |
7972aab2 DG |
4627 | /* Depending on the buffer type, a different channel key is used. */ |
4628 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4629 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4630 | } else { |
7972aab2 | 4631 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4632 | } |
4633 | ||
7972aab2 DG |
4634 | pthread_mutex_lock(®istry->lock); |
4635 | ||
4636 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4637 | assert(chan_reg); | |
4638 | ||
4639 | if (!chan_reg->register_done) { | |
4640 | reg_count = ust_registry_get_event_count(chan_reg); | |
4641 | if (reg_count < 31) { | |
4642 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4643 | } else { | |
4644 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4645 | } | |
4646 | ||
4647 | chan_reg->nr_ctx_fields = nr_fields; | |
4648 | chan_reg->ctx_fields = fields; | |
4649 | chan_reg->header_type = type; | |
d0b96690 | 4650 | } else { |
7972aab2 DG |
4651 | /* Get current already assigned values. */ |
4652 | type = chan_reg->header_type; | |
d5d629b5 DG |
4653 | free(fields); |
4654 | /* Set to NULL so the error path does not do a double free. */ | |
4655 | fields = NULL; | |
d0b96690 | 4656 | } |
7972aab2 DG |
4657 | /* Channel id is set during the object creation. */ |
4658 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4659 | |
4660 | /* Append to metadata */ | |
7972aab2 DG |
4661 | if (!chan_reg->metadata_dumped) { |
4662 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4663 | if (ret_code) { |
4664 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4665 | goto reply; | |
4666 | } | |
4667 | } | |
4668 | ||
4669 | reply: | |
7972aab2 DG |
4670 | DBG3("UST app replying to register channel key %" PRIu64 |
4671 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4672 | ret_code); | |
d0b96690 DG |
4673 | |
4674 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4675 | if (ret < 0) { | |
4676 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4677 | ERR("UST app reply channel failed with ret %d", ret); | |
4678 | } else { | |
4679 | DBG3("UST app reply channel failed. Application died"); | |
4680 | } | |
4681 | goto error; | |
4682 | } | |
4683 | ||
7972aab2 DG |
4684 | /* This channel registry registration is completed. */ |
4685 | chan_reg->register_done = 1; | |
4686 | ||
d0b96690 | 4687 | error: |
7972aab2 | 4688 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4689 | error_rcu_unlock: |
d0b96690 | 4690 | rcu_read_unlock(); |
d5d629b5 DG |
4691 | if (ret) { |
4692 | free(fields); | |
4693 | } | |
d0b96690 DG |
4694 | return ret; |
4695 | } | |
4696 | ||
d88aee68 DG |
4697 | /* |
4698 | * Add event to the UST channel registry. When the event is added to the | |
4699 | * registry, the metadata is also created. Once done, this replies to the | |
4700 | * application with the appropriate error code. | |
4701 | * | |
4702 | * The session UST registry lock is acquired in the function. | |
4703 | * | |
4704 | * On success 0 is returned else a negative value. | |
4705 | */ | |
d0b96690 DG |
4706 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4707 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4708 | char *model_emf_uri) | |
4709 | { | |
4710 | int ret, ret_code; | |
4711 | uint32_t event_id = 0; | |
7972aab2 | 4712 | uint64_t chan_reg_key; |
d0b96690 DG |
4713 | struct ust_app *app; |
4714 | struct ust_app_channel *ua_chan; | |
4715 | struct ust_app_session *ua_sess; | |
7972aab2 | 4716 | struct ust_registry_session *registry; |
d0b96690 DG |
4717 | |
4718 | rcu_read_lock(); | |
4719 | ||
4720 | /* Lookup application. If not found, there is a code flow error. */ | |
4721 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4722 | if (!app) { |
4723 | DBG("Application socket %d is being teardown. Abort event notify", | |
4724 | sock); | |
4725 | ret = 0; | |
d5d629b5 DG |
4726 | free(sig); |
4727 | free(fields); | |
4728 | free(model_emf_uri); | |
d88aee68 DG |
4729 | goto error_rcu_unlock; |
4730 | } | |
d0b96690 | 4731 | |
4950b860 | 4732 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4733 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4734 | if (!ua_chan) { |
4735 | DBG("Application channel is being teardown. Abort event notify"); | |
4736 | ret = 0; | |
d5d629b5 DG |
4737 | free(sig); |
4738 | free(fields); | |
4739 | free(model_emf_uri); | |
4950b860 MD |
4740 | goto error_rcu_unlock; |
4741 | } | |
4742 | ||
d0b96690 DG |
4743 | assert(ua_chan->session); |
4744 | ua_sess = ua_chan->session; | |
4745 | ||
7972aab2 DG |
4746 | registry = get_session_registry(ua_sess); |
4747 | assert(registry); | |
4748 | ||
4749 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4750 | chan_reg_key = ua_chan->tracing_channel_id; | |
4751 | } else { | |
4752 | chan_reg_key = ua_chan->key; | |
4753 | } | |
4754 | ||
4755 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4756 | |
d5d629b5 DG |
4757 | /* |
4758 | * From this point on, this call acquires the ownership of the sig, fields | |
4759 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4760 | * three variables MUST NOT be read/write after this. | |
4761 | */ | |
7972aab2 | 4762 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4763 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
9664f59b MD |
4764 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4765 | app); | |
d0b96690 DG |
4766 | |
4767 | /* | |
4768 | * The return value is returned to ustctl so in case of an error, the | |
4769 | * application can be notified. In case of an error, it's important not to | |
4770 | * return a negative error or else the application will get closed. | |
4771 | */ | |
4772 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4773 | if (ret < 0) { | |
4774 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4775 | ERR("UST app reply event failed with ret %d", ret); | |
4776 | } else { | |
4777 | DBG3("UST app reply event failed. Application died"); | |
4778 | } | |
4779 | /* | |
4780 | * No need to wipe the create event since the application socket will | |
4781 | * get close on error hence cleaning up everything by itself. | |
4782 | */ | |
4783 | goto error; | |
4784 | } | |
4785 | ||
7972aab2 DG |
4786 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4787 | name, event_id); | |
d88aee68 | 4788 | |
d0b96690 | 4789 | error: |
7972aab2 | 4790 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4791 | error_rcu_unlock: |
d0b96690 DG |
4792 | rcu_read_unlock(); |
4793 | return ret; | |
4794 | } | |
4795 | ||
d88aee68 DG |
4796 | /* |
4797 | * Handle application notification through the given notify socket. | |
4798 | * | |
4799 | * Return 0 on success or else a negative value. | |
4800 | */ | |
d0b96690 DG |
4801 | int ust_app_recv_notify(int sock) |
4802 | { | |
4803 | int ret; | |
4804 | enum ustctl_notify_cmd cmd; | |
4805 | ||
4806 | DBG3("UST app receiving notify from sock %d", sock); | |
4807 | ||
4808 | ret = ustctl_recv_notify(sock, &cmd); | |
4809 | if (ret < 0) { | |
4810 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4811 | ERR("UST app recv notify failed with ret %d", ret); | |
4812 | } else { | |
4813 | DBG3("UST app recv notify failed. Application died"); | |
4814 | } | |
4815 | goto error; | |
4816 | } | |
4817 | ||
4818 | switch (cmd) { | |
4819 | case USTCTL_NOTIFY_CMD_EVENT: | |
4820 | { | |
4821 | int sobjd, cobjd, loglevel; | |
4822 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4823 | size_t nr_fields; | |
4824 | struct ustctl_field *fields; | |
4825 | ||
4826 | DBG2("UST app ustctl register event received"); | |
4827 | ||
4828 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4829 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4830 | if (ret < 0) { | |
4831 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4832 | ERR("UST app recv event failed with ret %d", ret); | |
4833 | } else { | |
4834 | DBG3("UST app recv event failed. Application died"); | |
4835 | } | |
4836 | goto error; | |
4837 | } | |
4838 | ||
d5d629b5 DG |
4839 | /* |
4840 | * Add event to the UST registry coming from the notify socket. This | |
4841 | * call will free if needed the sig, fields and model_emf_uri. This | |
4842 | * code path loses the ownsership of these variables and transfer them | |
4843 | * to the this function. | |
4844 | */ | |
d0b96690 DG |
4845 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4846 | fields, loglevel, model_emf_uri); | |
4847 | if (ret < 0) { | |
4848 | goto error; | |
4849 | } | |
4850 | ||
4851 | break; | |
4852 | } | |
4853 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4854 | { | |
4855 | int sobjd, cobjd; | |
4856 | size_t nr_fields; | |
4857 | struct ustctl_field *fields; | |
4858 | ||
4859 | DBG2("UST app ustctl register channel received"); | |
4860 | ||
4861 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4862 | &fields); | |
4863 | if (ret < 0) { | |
4864 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4865 | ERR("UST app recv channel failed with ret %d", ret); | |
4866 | } else { | |
4867 | DBG3("UST app recv channel failed. Application died"); | |
4868 | } | |
4869 | goto error; | |
4870 | } | |
4871 | ||
d5d629b5 DG |
4872 | /* |
4873 | * The fields ownership are transfered to this function call meaning | |
4874 | * that if needed it will be freed. After this, it's invalid to access | |
4875 | * fields or clean it up. | |
4876 | */ | |
d0b96690 DG |
4877 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4878 | fields); | |
4879 | if (ret < 0) { | |
4880 | goto error; | |
4881 | } | |
4882 | ||
4883 | break; | |
4884 | } | |
4885 | default: | |
4886 | /* Should NEVER happen. */ | |
4887 | assert(0); | |
4888 | } | |
4889 | ||
4890 | error: | |
4891 | return ret; | |
4892 | } | |
d88aee68 DG |
4893 | |
4894 | /* | |
4895 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4896 | * corresponding application. On failure, the call_rcu to close the socket is | |
4897 | * executed. If an application is found, it tries to delete it from the notify | |
4898 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4899 | * | |
4900 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4901 | * call RCU is not done but the rest of the cleanup is. | |
4902 | */ | |
4903 | void ust_app_notify_sock_unregister(int sock) | |
4904 | { | |
4905 | int err_enomem = 0; | |
4906 | struct lttng_ht_iter iter; | |
4907 | struct ust_app *app; | |
4908 | struct ust_app_notify_sock_obj *obj; | |
4909 | ||
4910 | assert(sock >= 0); | |
4911 | ||
4912 | rcu_read_lock(); | |
4913 | ||
4914 | obj = zmalloc(sizeof(*obj)); | |
4915 | if (!obj) { | |
4916 | /* | |
4917 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4918 | * procedure but the call_rcu will not be called. In this case, we | |
4919 | * accept the fd leak rather than possibly creating an unsynchronized | |
4920 | * state between threads. | |
4921 | * | |
4922 | * TODO: The notify object should be created once the notify socket is | |
4923 | * registered and stored independantely from the ust app object. The | |
4924 | * tricky part is to synchronize the teardown of the application and | |
4925 | * this notify object. Let's keep that in mind so we can avoid this | |
4926 | * kind of shenanigans with ENOMEM in the teardown path. | |
4927 | */ | |
4928 | err_enomem = 1; | |
4929 | } else { | |
4930 | obj->fd = sock; | |
4931 | } | |
4932 | ||
4933 | DBG("UST app notify socket unregister %d", sock); | |
4934 | ||
4935 | /* | |
4936 | * Lookup application by notify socket. If this fails, this means that the | |
4937 | * hash table delete has already been done by the application | |
4938 | * unregistration process so we can safely close the notify socket in a | |
4939 | * call RCU. | |
4940 | */ | |
4941 | app = find_app_by_notify_sock(sock); | |
4942 | if (!app) { | |
4943 | goto close_socket; | |
4944 | } | |
4945 | ||
4946 | iter.iter.node = &app->notify_sock_n.node; | |
4947 | ||
4948 | /* | |
4949 | * Whatever happens here either we fail or succeed, in both cases we have | |
4950 | * to close the socket after a grace period to continue to the call RCU | |
4951 | * here. If the deletion is successful, the application is not visible | |
4952 | * anymore by other threads and is it fails it means that it was already | |
4953 | * deleted from the hash table so either way we just have to close the | |
4954 | * socket. | |
4955 | */ | |
4956 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4957 | ||
4958 | close_socket: | |
4959 | rcu_read_unlock(); | |
4960 | ||
4961 | /* | |
4962 | * Close socket after a grace period to avoid for the socket to be reused | |
4963 | * before the application object is freed creating potential race between | |
4964 | * threads trying to add unique in the global hash table. | |
4965 | */ | |
4966 | if (!err_enomem) { | |
4967 | call_rcu(&obj->head, close_notify_sock_rcu); | |
4968 | } | |
4969 | } | |
f45e313d DG |
4970 | |
4971 | /* | |
4972 | * Destroy a ust app data structure and free its memory. | |
4973 | */ | |
4974 | void ust_app_destroy(struct ust_app *app) | |
4975 | { | |
4976 | if (!app) { | |
4977 | return; | |
4978 | } | |
4979 | ||
4980 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
4981 | } |