Commit | Line | Data |
---|---|---|
91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
91d76f53 DG |
7 | * |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
d14d33bf AM |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
16 | */ |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <errno.h> | |
7972aab2 | 20 | #include <inttypes.h> |
91d76f53 DG |
21 | #include <pthread.h> |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
099e26bd | 24 | #include <string.h> |
aba8e916 DG |
25 | #include <sys/stat.h> |
26 | #include <sys/types.h> | |
099e26bd | 27 | #include <unistd.h> |
0df502fd | 28 | #include <urcu/compiler.h> |
fb54cdbf | 29 | #include <lttng/ust-error.h> |
331744e3 | 30 | #include <signal.h> |
bec39940 | 31 | |
990570ed | 32 | #include <common/common.h> |
86acf0da | 33 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 34 | |
7972aab2 | 35 | #include "buffer-registry.h" |
86acf0da DG |
36 | #include "fd-limit.h" |
37 | #include "health.h" | |
56fff090 | 38 | #include "ust-app.h" |
48842b30 | 39 | #include "ust-consumer.h" |
d80a6244 | 40 | #include "ust-ctl.h" |
0b2dc8df | 41 | #include "utils.h" |
d80a6244 | 42 | |
77c5447b MD |
43 | /* Next available channel key. Access under next_channel_key_lock. */ |
44 | static uint64_t _next_channel_key; | |
45 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
46 | ||
47 | /* Next available session ID. Access under next_session_id_lock. */ | |
48 | static uint64_t _next_session_id; | |
49 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
50 | |
51 | /* | |
77c5447b | 52 | * Return the incremented value of next_channel_key. |
ffe60014 | 53 | */ |
77c5447b | 54 | static uint64_t get_next_channel_key(void) |
ffe60014 | 55 | { |
77c5447b MD |
56 | uint64_t ret; |
57 | ||
58 | pthread_mutex_lock(&next_channel_key_lock); | |
59 | ret = ++_next_channel_key; | |
60 | pthread_mutex_unlock(&next_channel_key_lock); | |
61 | return ret; | |
ffe60014 DG |
62 | } |
63 | ||
64 | /* | |
7972aab2 | 65 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 66 | */ |
77c5447b | 67 | static uint64_t get_next_session_id(void) |
ffe60014 | 68 | { |
77c5447b MD |
69 | uint64_t ret; |
70 | ||
71 | pthread_mutex_lock(&next_session_id_lock); | |
72 | ret = ++_next_session_id; | |
73 | pthread_mutex_unlock(&next_session_id_lock); | |
74 | return ret; | |
ffe60014 DG |
75 | } |
76 | ||
d65d2de8 DG |
77 | static void copy_channel_attr_to_ustctl( |
78 | struct ustctl_consumer_channel_attr *attr, | |
79 | struct lttng_ust_channel_attr *uattr) | |
80 | { | |
81 | /* Copy event attributes since the layout is different. */ | |
82 | attr->subbuf_size = uattr->subbuf_size; | |
83 | attr->num_subbuf = uattr->num_subbuf; | |
84 | attr->overwrite = uattr->overwrite; | |
85 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
86 | attr->read_timer_interval = uattr->read_timer_interval; | |
87 | attr->output = uattr->output; | |
88 | } | |
89 | ||
025faf73 DG |
90 | /* |
91 | * Match function for the hash table lookup. | |
92 | * | |
93 | * It matches an ust app event based on three attributes which are the event | |
94 | * name, the filter bytecode and the loglevel. | |
95 | */ | |
18eace3b DG |
96 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
97 | { | |
98 | struct ust_app_event *event; | |
99 | const struct ust_app_ht_key *key; | |
100 | ||
101 | assert(node); | |
102 | assert(_key); | |
103 | ||
104 | event = caa_container_of(node, struct ust_app_event, node.node); | |
105 | key = _key; | |
106 | ||
107 | /* Match the 3 elements of the key: name, filter and loglevel. */ | |
108 | ||
109 | /* Event name */ | |
110 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
111 | goto no_match; | |
112 | } | |
113 | ||
114 | /* Event loglevel. */ | |
115 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
116 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
117 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
118 | /* | |
119 | * Match is accepted. This is because on event creation, the | |
120 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
121 | * -1 are accepted for this loglevel type since 0 is the one set by | |
122 | * the API when receiving an enable event. | |
123 | */ | |
124 | } else { | |
125 | goto no_match; | |
126 | } | |
18eace3b DG |
127 | } |
128 | ||
129 | /* One of the filters is NULL, fail. */ | |
130 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
131 | goto no_match; | |
132 | } | |
133 | ||
025faf73 DG |
134 | if (key->filter && event->filter) { |
135 | /* Both filters exists, check length followed by the bytecode. */ | |
136 | if (event->filter->len != key->filter->len || | |
137 | memcmp(event->filter->data, key->filter->data, | |
138 | event->filter->len) != 0) { | |
139 | goto no_match; | |
140 | } | |
18eace3b DG |
141 | } |
142 | ||
025faf73 | 143 | /* Match. */ |
18eace3b DG |
144 | return 1; |
145 | ||
146 | no_match: | |
147 | return 0; | |
18eace3b DG |
148 | } |
149 | ||
025faf73 DG |
150 | /* |
151 | * Unique add of an ust app event in the given ht. This uses the custom | |
152 | * ht_match_ust_app_event match function and the event name as hash. | |
153 | */ | |
d0b96690 | 154 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
155 | struct ust_app_event *event) |
156 | { | |
157 | struct cds_lfht_node *node_ptr; | |
158 | struct ust_app_ht_key key; | |
d0b96690 | 159 | struct lttng_ht *ht; |
18eace3b | 160 | |
d0b96690 DG |
161 | assert(ua_chan); |
162 | assert(ua_chan->events); | |
18eace3b DG |
163 | assert(event); |
164 | ||
d0b96690 | 165 | ht = ua_chan->events; |
18eace3b DG |
166 | key.name = event->attr.name; |
167 | key.filter = event->filter; | |
168 | key.loglevel = event->attr.loglevel; | |
169 | ||
170 | node_ptr = cds_lfht_add_unique(ht->ht, | |
171 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
172 | ht_match_ust_app_event, &key, &event->node.node); | |
173 | assert(node_ptr == &event->node.node); | |
174 | } | |
175 | ||
d88aee68 DG |
176 | /* |
177 | * Close the notify socket from the given RCU head object. This MUST be called | |
178 | * through a call_rcu(). | |
179 | */ | |
180 | static void close_notify_sock_rcu(struct rcu_head *head) | |
181 | { | |
182 | int ret; | |
183 | struct ust_app_notify_sock_obj *obj = | |
184 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
185 | ||
186 | /* Must have a valid fd here. */ | |
187 | assert(obj->fd >= 0); | |
188 | ||
189 | ret = close(obj->fd); | |
190 | if (ret) { | |
191 | ERR("close notify sock %d RCU", obj->fd); | |
192 | } | |
193 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
194 | ||
195 | free(obj); | |
196 | } | |
197 | ||
7972aab2 DG |
198 | /* |
199 | * Return the session registry according to the buffer type of the given | |
200 | * session. | |
201 | * | |
202 | * A registry per UID object MUST exists before calling this function or else | |
203 | * it assert() if not found. RCU read side lock must be acquired. | |
204 | */ | |
205 | static struct ust_registry_session *get_session_registry( | |
206 | struct ust_app_session *ua_sess) | |
207 | { | |
208 | struct ust_registry_session *registry = NULL; | |
209 | ||
210 | assert(ua_sess); | |
211 | ||
212 | switch (ua_sess->buffer_type) { | |
213 | case LTTNG_BUFFER_PER_PID: | |
214 | { | |
215 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
216 | if (!reg_pid) { | |
217 | goto error; | |
218 | } | |
219 | registry = reg_pid->registry->reg.ust; | |
220 | break; | |
221 | } | |
222 | case LTTNG_BUFFER_PER_UID: | |
223 | { | |
224 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
225 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
226 | if (!reg_uid) { | |
227 | goto error; | |
228 | } | |
229 | registry = reg_uid->registry->reg.ust; | |
230 | break; | |
231 | } | |
232 | default: | |
233 | assert(0); | |
234 | }; | |
235 | ||
236 | error: | |
237 | return registry; | |
238 | } | |
239 | ||
55cc08a6 DG |
240 | /* |
241 | * Delete ust context safely. RCU read lock must be held before calling | |
242 | * this function. | |
243 | */ | |
244 | static | |
245 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
246 | { | |
ffe60014 DG |
247 | int ret; |
248 | ||
249 | assert(ua_ctx); | |
250 | ||
55cc08a6 | 251 | if (ua_ctx->obj) { |
ffe60014 | 252 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
253 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
254 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
255 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 256 | } |
55cc08a6 DG |
257 | free(ua_ctx->obj); |
258 | } | |
259 | free(ua_ctx); | |
260 | } | |
261 | ||
d80a6244 DG |
262 | /* |
263 | * Delete ust app event safely. RCU read lock must be held before calling | |
264 | * this function. | |
265 | */ | |
8b366481 DG |
266 | static |
267 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 268 | { |
ffe60014 DG |
269 | int ret; |
270 | ||
271 | assert(ua_event); | |
272 | ||
53a80697 | 273 | free(ua_event->filter); |
d80a6244 | 274 | |
edb67388 | 275 | if (ua_event->obj != NULL) { |
ffe60014 DG |
276 | ret = ustctl_release_object(sock, ua_event->obj); |
277 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
278 | ERR("UST app sock %d release event obj failed with ret %d", | |
279 | sock, ret); | |
280 | } | |
edb67388 DG |
281 | free(ua_event->obj); |
282 | } | |
d80a6244 DG |
283 | free(ua_event); |
284 | } | |
285 | ||
286 | /* | |
7972aab2 DG |
287 | * Release ust data object of the given stream. |
288 | * | |
289 | * Return 0 on success or else a negative value. | |
d80a6244 | 290 | */ |
7972aab2 | 291 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 292 | { |
7972aab2 | 293 | int ret = 0; |
ffe60014 DG |
294 | |
295 | assert(stream); | |
296 | ||
8b366481 | 297 | if (stream->obj) { |
ffe60014 DG |
298 | ret = ustctl_release_object(sock, stream->obj); |
299 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
300 | ERR("UST app sock %d release stream obj failed with ret %d", | |
301 | sock, ret); | |
302 | } | |
4063050c | 303 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
304 | free(stream->obj); |
305 | } | |
7972aab2 DG |
306 | |
307 | return ret; | |
308 | } | |
309 | ||
310 | /* | |
311 | * Delete ust app stream safely. RCU read lock must be held before calling | |
312 | * this function. | |
313 | */ | |
314 | static | |
315 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
316 | { | |
317 | assert(stream); | |
318 | ||
319 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 320 | free(stream); |
d80a6244 DG |
321 | } |
322 | ||
36b588ed MD |
323 | /* |
324 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
325 | * section and outside of call_rcu thread, so we postpone its execution |
326 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
327 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
328 | */ |
329 | static | |
330 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
331 | { | |
332 | struct ust_app_channel *ua_chan = | |
333 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
334 | ||
0b2dc8df MD |
335 | ht_cleanup_push(ua_chan->ctx); |
336 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
337 | free(ua_chan); |
338 | } | |
339 | ||
d80a6244 DG |
340 | /* |
341 | * Delete ust app channel safely. RCU read lock must be held before calling | |
342 | * this function. | |
343 | */ | |
8b366481 | 344 | static |
d0b96690 DG |
345 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
346 | struct ust_app *app) | |
d80a6244 DG |
347 | { |
348 | int ret; | |
bec39940 | 349 | struct lttng_ht_iter iter; |
d80a6244 | 350 | struct ust_app_event *ua_event; |
55cc08a6 | 351 | struct ust_app_ctx *ua_ctx; |
030a66fa | 352 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 353 | struct ust_registry_session *registry; |
d80a6244 | 354 | |
ffe60014 DG |
355 | assert(ua_chan); |
356 | ||
357 | DBG3("UST app deleting channel %s", ua_chan->name); | |
358 | ||
55cc08a6 | 359 | /* Wipe stream */ |
d80a6244 | 360 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 361 | cds_list_del(&stream->list); |
d80a6244 DG |
362 | delete_ust_app_stream(sock, stream); |
363 | } | |
364 | ||
55cc08a6 | 365 | /* Wipe context */ |
bec39940 | 366 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
4623416f | 367 | cds_list_del(&ua_ctx->list); |
bec39940 | 368 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 DG |
369 | assert(!ret); |
370 | delete_ust_app_ctx(sock, ua_ctx); | |
371 | } | |
d80a6244 | 372 | |
55cc08a6 | 373 | /* Wipe events */ |
bec39940 DG |
374 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
375 | node.node) { | |
376 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 377 | assert(!ret); |
d80a6244 DG |
378 | delete_ust_app_event(sock, ua_event); |
379 | } | |
edb67388 | 380 | |
5894f2c8 MD |
381 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
382 | /* Wipe and free registry from session registry. */ | |
383 | registry = get_session_registry(ua_chan->session); | |
384 | if (registry) { | |
385 | ust_registry_channel_del_free(registry, ua_chan->key); | |
386 | } | |
7972aab2 | 387 | } |
d0b96690 | 388 | |
edb67388 | 389 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
390 | /* Remove channel from application UST object descriptor. */ |
391 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
392 | lttng_ht_del(app->ust_objd, &iter); | |
ffe60014 DG |
393 | ret = ustctl_release_object(sock, ua_chan->obj); |
394 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
395 | ERR("UST app sock %d release channel obj failed with ret %d", | |
396 | sock, ret); | |
397 | } | |
7972aab2 | 398 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
399 | free(ua_chan->obj); |
400 | } | |
36b588ed | 401 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
402 | } |
403 | ||
331744e3 | 404 | /* |
1b532a60 DG |
405 | * Push metadata to consumer socket. |
406 | * | |
407 | * The socket lock MUST be acquired. | |
408 | * The ust app session lock MUST be acquired. | |
331744e3 JD |
409 | * |
410 | * On success, return the len of metadata pushed or else a negative value. | |
411 | */ | |
412 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
413 | struct consumer_socket *socket, int send_zero_data) | |
414 | { | |
415 | int ret; | |
416 | char *metadata_str = NULL; | |
417 | size_t len, offset; | |
418 | ssize_t ret_val; | |
419 | ||
420 | assert(registry); | |
421 | assert(socket); | |
1b532a60 DG |
422 | |
423 | /* | |
424 | * On a push metadata error either the consumer is dead or the metadata | |
425 | * channel has been destroyed because its endpoint might have died (e.g: | |
426 | * relayd). If so, the metadata closed flag is set to 1 so we deny pushing | |
427 | * metadata again which is not valid anymore on the consumer side. | |
428 | * | |
429 | * The ust app session mutex locked allows us to make this check without | |
430 | * the registry lock. | |
431 | */ | |
432 | if (registry->metadata_closed) { | |
433 | return -EPIPE; | |
434 | } | |
331744e3 JD |
435 | |
436 | pthread_mutex_lock(®istry->lock); | |
437 | ||
438 | offset = registry->metadata_len_sent; | |
439 | len = registry->metadata_len - registry->metadata_len_sent; | |
440 | if (len == 0) { | |
441 | DBG3("No metadata to push for metadata key %" PRIu64, | |
442 | registry->metadata_key); | |
443 | ret_val = len; | |
444 | if (send_zero_data) { | |
445 | DBG("No metadata to push"); | |
446 | goto push_data; | |
447 | } | |
448 | goto end; | |
449 | } | |
450 | ||
451 | /* Allocate only what we have to send. */ | |
452 | metadata_str = zmalloc(len); | |
453 | if (!metadata_str) { | |
454 | PERROR("zmalloc ust app metadata string"); | |
455 | ret_val = -ENOMEM; | |
456 | goto error; | |
457 | } | |
458 | /* Copy what we haven't send out. */ | |
459 | memcpy(metadata_str, registry->metadata + offset, len); | |
460 | registry->metadata_len_sent += len; | |
461 | ||
462 | push_data: | |
463 | pthread_mutex_unlock(®istry->lock); | |
464 | ret = consumer_push_metadata(socket, registry->metadata_key, | |
465 | metadata_str, len, offset); | |
466 | if (ret < 0) { | |
467 | ret_val = ret; | |
468 | goto error_push; | |
469 | } | |
470 | ||
471 | free(metadata_str); | |
472 | return len; | |
473 | ||
474 | end: | |
475 | error: | |
476 | pthread_mutex_unlock(®istry->lock); | |
477 | error_push: | |
478 | free(metadata_str); | |
479 | return ret_val; | |
480 | } | |
481 | ||
d88aee68 DG |
482 | /* |
483 | * For a given application and session, push metadata to consumer. The session | |
484 | * lock MUST be acquired here before calling this. | |
331744e3 JD |
485 | * Either sock or consumer is required : if sock is NULL, the default |
486 | * socket to send the metadata is retrieved from consumer, if sock | |
487 | * is not NULL we use it to send the metadata. | |
d88aee68 DG |
488 | * |
489 | * Return 0 on success else a negative error. | |
490 | */ | |
7972aab2 DG |
491 | static int push_metadata(struct ust_registry_session *registry, |
492 | struct consumer_output *consumer) | |
d88aee68 | 493 | { |
331744e3 JD |
494 | int ret_val; |
495 | ssize_t ret; | |
d88aee68 DG |
496 | struct consumer_socket *socket; |
497 | ||
7972aab2 DG |
498 | assert(registry); |
499 | assert(consumer); | |
500 | ||
501 | rcu_read_lock(); | |
d88aee68 | 502 | |
7972aab2 DG |
503 | /* |
504 | * Means that no metadata was assigned to the session. This can happens if | |
505 | * no start has been done previously. | |
506 | */ | |
507 | if (!registry->metadata_key) { | |
331744e3 | 508 | ret_val = 0; |
1b532a60 | 509 | goto end_rcu_unlock; |
d88aee68 DG |
510 | } |
511 | ||
d88aee68 | 512 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
513 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
514 | consumer); | |
d88aee68 | 515 | if (!socket) { |
331744e3 | 516 | ret_val = -1; |
d88aee68 DG |
517 | goto error_rcu_unlock; |
518 | } | |
519 | ||
520 | /* | |
521 | * TODO: Currently, we hold the socket lock around sampling of the next | |
522 | * metadata segment to ensure we send metadata over the consumer socket in | |
523 | * the correct order. This makes the registry lock nest inside the socket | |
524 | * lock. | |
525 | * | |
526 | * Please note that this is a temporary measure: we should move this lock | |
527 | * back into ust_consumer_push_metadata() when the consumer gets the | |
528 | * ability to reorder the metadata it receives. | |
529 | */ | |
530 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
531 | ret = ust_app_push_metadata(registry, socket, 0); |
532 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 533 | if (ret < 0) { |
331744e3 | 534 | ret_val = ret; |
d88aee68 DG |
535 | goto error_rcu_unlock; |
536 | } | |
537 | ||
d88aee68 | 538 | rcu_read_unlock(); |
d88aee68 DG |
539 | return 0; |
540 | ||
d88aee68 | 541 | error_rcu_unlock: |
1b532a60 DG |
542 | /* |
543 | * On error, flag the registry that the metadata is closed. We were unable | |
544 | * to push anything and this means that either the consumer is not | |
545 | * responding or the metadata cache has been destroyed on the consumer. | |
546 | */ | |
547 | registry->metadata_closed = 1; | |
548 | end_rcu_unlock: | |
d88aee68 | 549 | rcu_read_unlock(); |
331744e3 | 550 | return ret_val; |
d88aee68 DG |
551 | } |
552 | ||
553 | /* | |
554 | * Send to the consumer a close metadata command for the given session. Once | |
555 | * done, the metadata channel is deleted and the session metadata pointer is | |
556 | * nullified. The session lock MUST be acquired here unless the application is | |
557 | * in the destroy path. | |
558 | * | |
559 | * Return 0 on success else a negative value. | |
560 | */ | |
7972aab2 DG |
561 | static int close_metadata(struct ust_registry_session *registry, |
562 | struct consumer_output *consumer) | |
d88aee68 DG |
563 | { |
564 | int ret; | |
565 | struct consumer_socket *socket; | |
566 | ||
7972aab2 DG |
567 | assert(registry); |
568 | assert(consumer); | |
d88aee68 | 569 | |
7972aab2 DG |
570 | rcu_read_lock(); |
571 | ||
572 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 | 573 | ret = 0; |
1b532a60 | 574 | goto end; |
d88aee68 DG |
575 | } |
576 | ||
d88aee68 | 577 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
578 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
579 | consumer); | |
d88aee68 DG |
580 | if (!socket) { |
581 | ret = -1; | |
7972aab2 | 582 | goto error; |
d88aee68 DG |
583 | } |
584 | ||
7972aab2 | 585 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 586 | if (ret < 0) { |
7972aab2 | 587 | goto error; |
d88aee68 DG |
588 | } |
589 | ||
d88aee68 | 590 | error: |
1b532a60 DG |
591 | /* |
592 | * Metadata closed. Even on error this means that the consumer is not | |
593 | * responding or not found so either way a second close should NOT be emit | |
594 | * for this registry. | |
595 | */ | |
596 | registry->metadata_closed = 1; | |
597 | end: | |
7972aab2 | 598 | rcu_read_unlock(); |
d88aee68 DG |
599 | return ret; |
600 | } | |
601 | ||
36b588ed MD |
602 | /* |
603 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
604 | * section and outside of call_rcu thread, so we postpone its execution |
605 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
606 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
607 | */ |
608 | static | |
609 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
610 | { | |
611 | struct ust_app_session *ua_sess = | |
612 | caa_container_of(head, struct ust_app_session, rcu_head); | |
613 | ||
0b2dc8df | 614 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
615 | free(ua_sess); |
616 | } | |
617 | ||
d80a6244 DG |
618 | /* |
619 | * Delete ust app session safely. RCU read lock must be held before calling | |
620 | * this function. | |
621 | */ | |
8b366481 | 622 | static |
d0b96690 DG |
623 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
624 | struct ust_app *app) | |
d80a6244 DG |
625 | { |
626 | int ret; | |
bec39940 | 627 | struct lttng_ht_iter iter; |
d80a6244 | 628 | struct ust_app_channel *ua_chan; |
7972aab2 | 629 | struct ust_registry_session *registry; |
d80a6244 | 630 | |
d88aee68 DG |
631 | assert(ua_sess); |
632 | ||
1b532a60 DG |
633 | pthread_mutex_lock(&ua_sess->lock); |
634 | ||
7972aab2 | 635 | registry = get_session_registry(ua_sess); |
1b532a60 | 636 | if (registry && !registry->metadata_closed) { |
d88aee68 | 637 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 638 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 639 | |
7972aab2 DG |
640 | /* |
641 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
642 | * metadata only on destroy trace session in this case. Also, the |
643 | * previous push metadata could have flag the metadata registry to | |
644 | * close so don't send a close command if closed. | |
7972aab2 | 645 | */ |
1b532a60 DG |
646 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
647 | !registry->metadata_closed) { | |
7972aab2 DG |
648 | /* And ask to close it for this session registry. */ |
649 | (void) close_metadata(registry, ua_sess->consumer); | |
650 | } | |
d80a6244 DG |
651 | } |
652 | ||
bec39940 DG |
653 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
654 | node.node) { | |
655 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 656 | assert(!ret); |
d0b96690 | 657 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 658 | } |
d80a6244 | 659 | |
7972aab2 DG |
660 | /* In case of per PID, the registry is kept in the session. */ |
661 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
662 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
663 | if (reg_pid) { | |
664 | buffer_reg_pid_remove(reg_pid); | |
665 | buffer_reg_pid_destroy(reg_pid); | |
666 | } | |
667 | } | |
d0b96690 | 668 | |
aee6bafd | 669 | if (ua_sess->handle != -1) { |
ffe60014 DG |
670 | ret = ustctl_release_handle(sock, ua_sess->handle); |
671 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
672 | ERR("UST app sock %d release session handle failed with ret %d", | |
673 | sock, ret); | |
674 | } | |
aee6bafd | 675 | } |
1b532a60 DG |
676 | pthread_mutex_unlock(&ua_sess->lock); |
677 | ||
36b588ed | 678 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 679 | } |
91d76f53 DG |
680 | |
681 | /* | |
284d8f55 DG |
682 | * Delete a traceable application structure from the global list. Never call |
683 | * this function outside of a call_rcu call. | |
36b588ed MD |
684 | * |
685 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 686 | */ |
8b366481 DG |
687 | static |
688 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 689 | { |
8b366481 | 690 | int ret, sock; |
d42f20df | 691 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 692 | |
d80a6244 | 693 | /* Delete ust app sessions info */ |
852d0037 DG |
694 | sock = app->sock; |
695 | app->sock = -1; | |
d80a6244 | 696 | |
8b366481 | 697 | /* Wipe sessions */ |
d42f20df DG |
698 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
699 | teardown_node) { | |
700 | /* Free every object in the session and the session. */ | |
36b588ed | 701 | rcu_read_lock(); |
d0b96690 | 702 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 703 | rcu_read_unlock(); |
d80a6244 | 704 | } |
36b588ed | 705 | |
0b2dc8df MD |
706 | ht_cleanup_push(app->sessions); |
707 | ht_cleanup_push(app->ust_objd); | |
d80a6244 | 708 | |
6414a713 | 709 | /* |
852d0037 DG |
710 | * Wait until we have deleted the application from the sock hash table |
711 | * before closing this socket, otherwise an application could re-use the | |
712 | * socket ID and race with the teardown, using the same hash table entry. | |
713 | * | |
714 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
715 | * all RCU readers that could run concurrently with unregister app, | |
716 | * therefore we _need_ to only close that socket after a grace period. So | |
717 | * it should stay in this RCU callback. | |
718 | * | |
719 | * This close() is a very important step of the synchronization model so | |
720 | * every modification to this function must be carefully reviewed. | |
6414a713 | 721 | */ |
799e2c4f MD |
722 | ret = close(sock); |
723 | if (ret) { | |
724 | PERROR("close"); | |
725 | } | |
4063050c | 726 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 727 | |
852d0037 | 728 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 729 | free(app); |
099e26bd DG |
730 | } |
731 | ||
732 | /* | |
f6a9efaa | 733 | * URCU intermediate call to delete an UST app. |
099e26bd | 734 | */ |
8b366481 DG |
735 | static |
736 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 737 | { |
bec39940 DG |
738 | struct lttng_ht_node_ulong *node = |
739 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 740 | struct ust_app *app = |
852d0037 | 741 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 742 | |
852d0037 | 743 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 744 | delete_ust_app(app); |
099e26bd DG |
745 | } |
746 | ||
ffe60014 DG |
747 | /* |
748 | * Delete the session from the application ht and delete the data structure by | |
749 | * freeing every object inside and releasing them. | |
750 | */ | |
d0b96690 | 751 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
752 | struct ust_app_session *ua_sess) |
753 | { | |
754 | int ret; | |
755 | struct lttng_ht_iter iter; | |
756 | ||
757 | assert(app); | |
758 | assert(ua_sess); | |
759 | ||
760 | iter.iter.node = &ua_sess->node.node; | |
761 | ret = lttng_ht_del(app->sessions, &iter); | |
762 | if (ret) { | |
763 | /* Already scheduled for teardown. */ | |
764 | goto end; | |
765 | } | |
766 | ||
767 | /* Once deleted, free the data structure. */ | |
d0b96690 | 768 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
769 | |
770 | end: | |
771 | return; | |
772 | } | |
773 | ||
8b366481 DG |
774 | /* |
775 | * Alloc new UST app session. | |
776 | */ | |
777 | static | |
d0b96690 | 778 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
779 | { |
780 | struct ust_app_session *ua_sess; | |
781 | ||
782 | /* Init most of the default value by allocating and zeroing */ | |
783 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
784 | if (ua_sess == NULL) { | |
785 | PERROR("malloc"); | |
ffe60014 | 786 | goto error_free; |
8b366481 DG |
787 | } |
788 | ||
789 | ua_sess->handle = -1; | |
bec39940 | 790 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
d0b96690 | 791 | pthread_mutex_init(&ua_sess->lock, NULL); |
ffe60014 | 792 | |
8b366481 DG |
793 | return ua_sess; |
794 | ||
ffe60014 | 795 | error_free: |
8b366481 DG |
796 | return NULL; |
797 | } | |
798 | ||
799 | /* | |
800 | * Alloc new UST app channel. | |
801 | */ | |
802 | static | |
803 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 804 | struct ust_app_session *ua_sess, |
ffe60014 | 805 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
806 | { |
807 | struct ust_app_channel *ua_chan; | |
808 | ||
809 | /* Init most of the default value by allocating and zeroing */ | |
810 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
811 | if (ua_chan == NULL) { | |
812 | PERROR("malloc"); | |
813 | goto error; | |
814 | } | |
815 | ||
816 | /* Setup channel name */ | |
817 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
818 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
819 | ||
820 | ua_chan->enabled = 1; | |
821 | ua_chan->handle = -1; | |
45893984 | 822 | ua_chan->session = ua_sess; |
ffe60014 | 823 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
824 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
825 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
826 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
827 | |
828 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
4623416f | 829 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
830 | |
831 | /* Copy attributes */ | |
832 | if (attr) { | |
ffe60014 | 833 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
834 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
835 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
836 | ua_chan->attr.overwrite = attr->overwrite; | |
837 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
838 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
839 | ua_chan->attr.output = attr->output; | |
8b366481 | 840 | } |
ffe60014 DG |
841 | /* By default, the channel is a per cpu channel. */ |
842 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
843 | |
844 | DBG3("UST app channel %s allocated", ua_chan->name); | |
845 | ||
846 | return ua_chan; | |
847 | ||
848 | error: | |
849 | return NULL; | |
850 | } | |
851 | ||
37f1c236 DG |
852 | /* |
853 | * Allocate and initialize a UST app stream. | |
854 | * | |
855 | * Return newly allocated stream pointer or NULL on error. | |
856 | */ | |
ffe60014 | 857 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
858 | { |
859 | struct ust_app_stream *stream = NULL; | |
860 | ||
861 | stream = zmalloc(sizeof(*stream)); | |
862 | if (stream == NULL) { | |
863 | PERROR("zmalloc ust app stream"); | |
864 | goto error; | |
865 | } | |
866 | ||
867 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
868 | stream->handle = -1; | |
869 | ||
870 | error: | |
871 | return stream; | |
872 | } | |
873 | ||
8b366481 DG |
874 | /* |
875 | * Alloc new UST app event. | |
876 | */ | |
877 | static | |
878 | struct ust_app_event *alloc_ust_app_event(char *name, | |
879 | struct lttng_ust_event *attr) | |
880 | { | |
881 | struct ust_app_event *ua_event; | |
882 | ||
883 | /* Init most of the default value by allocating and zeroing */ | |
884 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
885 | if (ua_event == NULL) { | |
886 | PERROR("malloc"); | |
887 | goto error; | |
888 | } | |
889 | ||
890 | ua_event->enabled = 1; | |
891 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
892 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 893 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
894 | |
895 | /* Copy attributes */ | |
896 | if (attr) { | |
897 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
898 | } | |
899 | ||
900 | DBG3("UST app event %s allocated", ua_event->name); | |
901 | ||
902 | return ua_event; | |
903 | ||
904 | error: | |
905 | return NULL; | |
906 | } | |
907 | ||
908 | /* | |
909 | * Alloc new UST app context. | |
910 | */ | |
911 | static | |
912 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
913 | { | |
914 | struct ust_app_ctx *ua_ctx; | |
915 | ||
916 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
917 | if (ua_ctx == NULL) { | |
918 | goto error; | |
919 | } | |
920 | ||
4623416f DG |
921 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
922 | ||
8b366481 DG |
923 | if (uctx) { |
924 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
925 | } | |
926 | ||
927 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
928 | ||
929 | error: | |
930 | return ua_ctx; | |
931 | } | |
932 | ||
025faf73 DG |
933 | /* |
934 | * Allocate a filter and copy the given original filter. | |
935 | * | |
936 | * Return allocated filter or NULL on error. | |
937 | */ | |
938 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
939 | struct lttng_ust_filter_bytecode *orig_f) | |
940 | { | |
941 | struct lttng_ust_filter_bytecode *filter = NULL; | |
942 | ||
943 | /* Copy filter bytecode */ | |
944 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
945 | if (!filter) { | |
946 | PERROR("zmalloc alloc ust app filter"); | |
947 | goto error; | |
948 | } | |
949 | ||
950 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
951 | ||
952 | error: | |
953 | return filter; | |
954 | } | |
955 | ||
099e26bd | 956 | /* |
421cb601 DG |
957 | * Find an ust_app using the sock and return it. RCU read side lock must be |
958 | * held before calling this helper function. | |
099e26bd | 959 | */ |
8b366481 DG |
960 | static |
961 | struct ust_app *find_app_by_sock(int sock) | |
099e26bd | 962 | { |
bec39940 | 963 | struct lttng_ht_node_ulong *node; |
bec39940 | 964 | struct lttng_ht_iter iter; |
f6a9efaa | 965 | |
852d0037 | 966 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 967 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
968 | if (node == NULL) { |
969 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
970 | goto error; |
971 | } | |
852d0037 DG |
972 | |
973 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
974 | |
975 | error: | |
976 | return NULL; | |
099e26bd DG |
977 | } |
978 | ||
d0b96690 DG |
979 | /* |
980 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
981 | * be held before calling this helper function. | |
982 | */ | |
983 | static struct ust_app *find_app_by_notify_sock(int sock) | |
984 | { | |
985 | struct lttng_ht_node_ulong *node; | |
986 | struct lttng_ht_iter iter; | |
987 | ||
988 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
989 | &iter); | |
990 | node = lttng_ht_iter_get_node_ulong(&iter); | |
991 | if (node == NULL) { | |
992 | DBG2("UST app find by notify sock %d not found", sock); | |
993 | goto error; | |
994 | } | |
995 | ||
996 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
997 | ||
998 | error: | |
999 | return NULL; | |
1000 | } | |
1001 | ||
025faf73 DG |
1002 | /* |
1003 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1004 | * event loglevel. | |
1005 | * | |
1006 | * Return an ust_app_event object or NULL on error. | |
1007 | */ | |
18eace3b DG |
1008 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
1009 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel) | |
1010 | { | |
1011 | struct lttng_ht_iter iter; | |
1012 | struct lttng_ht_node_str *node; | |
1013 | struct ust_app_event *event = NULL; | |
1014 | struct ust_app_ht_key key; | |
18eace3b DG |
1015 | |
1016 | assert(name); | |
1017 | assert(ht); | |
1018 | ||
1019 | /* Setup key for event lookup. */ | |
1020 | key.name = name; | |
1021 | key.filter = filter; | |
1022 | key.loglevel = loglevel; | |
1023 | ||
025faf73 DG |
1024 | /* Lookup using the event name as hash and a custom match fct. */ |
1025 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1026 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1027 | node = lttng_ht_iter_get_node_str(&iter); |
1028 | if (node == NULL) { | |
1029 | goto end; | |
1030 | } | |
1031 | ||
1032 | event = caa_container_of(node, struct ust_app_event, node); | |
1033 | ||
1034 | end: | |
18eace3b DG |
1035 | return event; |
1036 | } | |
1037 | ||
55cc08a6 DG |
1038 | /* |
1039 | * Create the channel context on the tracer. | |
d0b96690 DG |
1040 | * |
1041 | * Called with UST app session lock held. | |
55cc08a6 DG |
1042 | */ |
1043 | static | |
1044 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1045 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1046 | { | |
1047 | int ret; | |
1048 | ||
840cb59c | 1049 | health_code_update(); |
86acf0da | 1050 | |
852d0037 | 1051 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1052 | ua_chan->obj, &ua_ctx->obj); |
1053 | if (ret < 0) { | |
ffe60014 DG |
1054 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1055 | ERR("UST app create channel context failed for app (pid: %d) " | |
1056 | "with ret %d", app->pid, ret); | |
1057 | } else { | |
47cb9d4a DG |
1058 | /* |
1059 | * This is normal behavior, an application can die during the | |
1060 | * creation process. Don't report an error so the execution can | |
1061 | * continue normally. | |
1062 | */ | |
1063 | ret = 0; | |
ffe60014 DG |
1064 | DBG3("UST app disable event failed. Application is dead."); |
1065 | } | |
55cc08a6 DG |
1066 | goto error; |
1067 | } | |
1068 | ||
1069 | ua_ctx->handle = ua_ctx->obj->handle; | |
1070 | ||
d0b96690 DG |
1071 | DBG2("UST app context handle %d created successfully for channel %s", |
1072 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1073 | |
1074 | error: | |
840cb59c | 1075 | health_code_update(); |
55cc08a6 DG |
1076 | return ret; |
1077 | } | |
1078 | ||
53a80697 MD |
1079 | /* |
1080 | * Set the filter on the tracer. | |
1081 | */ | |
1082 | static | |
1083 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1084 | struct ust_app *app) | |
1085 | { | |
1086 | int ret; | |
1087 | ||
840cb59c | 1088 | health_code_update(); |
86acf0da | 1089 | |
53a80697 | 1090 | if (!ua_event->filter) { |
86acf0da DG |
1091 | ret = 0; |
1092 | goto error; | |
53a80697 MD |
1093 | } |
1094 | ||
1095 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1096 | ua_event->obj); | |
1097 | if (ret < 0) { | |
ffe60014 DG |
1098 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1099 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1100 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1101 | } else { | |
47cb9d4a DG |
1102 | /* |
1103 | * This is normal behavior, an application can die during the | |
1104 | * creation process. Don't report an error so the execution can | |
1105 | * continue normally. | |
1106 | */ | |
1107 | ret = 0; | |
ffe60014 DG |
1108 | DBG3("UST app filter event failed. Application is dead."); |
1109 | } | |
53a80697 MD |
1110 | goto error; |
1111 | } | |
1112 | ||
1113 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1114 | ||
1115 | error: | |
840cb59c | 1116 | health_code_update(); |
53a80697 MD |
1117 | return ret; |
1118 | } | |
1119 | ||
9730260e DG |
1120 | /* |
1121 | * Disable the specified event on to UST tracer for the UST session. | |
1122 | */ | |
1123 | static int disable_ust_event(struct ust_app *app, | |
1124 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1125 | { | |
1126 | int ret; | |
1127 | ||
840cb59c | 1128 | health_code_update(); |
86acf0da | 1129 | |
852d0037 | 1130 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1131 | if (ret < 0) { |
ffe60014 DG |
1132 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1133 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1134 | "and session handle %d with ret %d", | |
1135 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1136 | } else { | |
47cb9d4a DG |
1137 | /* |
1138 | * This is normal behavior, an application can die during the | |
1139 | * creation process. Don't report an error so the execution can | |
1140 | * continue normally. | |
1141 | */ | |
1142 | ret = 0; | |
ffe60014 DG |
1143 | DBG3("UST app disable event failed. Application is dead."); |
1144 | } | |
9730260e DG |
1145 | goto error; |
1146 | } | |
1147 | ||
1148 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1149 | ua_event->attr.name, app->pid); |
9730260e DG |
1150 | |
1151 | error: | |
840cb59c | 1152 | health_code_update(); |
9730260e DG |
1153 | return ret; |
1154 | } | |
1155 | ||
78f0bacd DG |
1156 | /* |
1157 | * Disable the specified channel on to UST tracer for the UST session. | |
1158 | */ | |
1159 | static int disable_ust_channel(struct ust_app *app, | |
1160 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1161 | { | |
1162 | int ret; | |
1163 | ||
840cb59c | 1164 | health_code_update(); |
86acf0da | 1165 | |
852d0037 | 1166 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1167 | if (ret < 0) { |
ffe60014 DG |
1168 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1169 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1170 | "and session handle %d with ret %d", | |
1171 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1172 | } else { | |
47cb9d4a DG |
1173 | /* |
1174 | * This is normal behavior, an application can die during the | |
1175 | * creation process. Don't report an error so the execution can | |
1176 | * continue normally. | |
1177 | */ | |
1178 | ret = 0; | |
ffe60014 DG |
1179 | DBG3("UST app disable channel failed. Application is dead."); |
1180 | } | |
78f0bacd DG |
1181 | goto error; |
1182 | } | |
1183 | ||
78f0bacd | 1184 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1185 | ua_chan->name, app->pid); |
78f0bacd DG |
1186 | |
1187 | error: | |
840cb59c | 1188 | health_code_update(); |
78f0bacd DG |
1189 | return ret; |
1190 | } | |
1191 | ||
1192 | /* | |
1193 | * Enable the specified channel on to UST tracer for the UST session. | |
1194 | */ | |
1195 | static int enable_ust_channel(struct ust_app *app, | |
1196 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1197 | { | |
1198 | int ret; | |
1199 | ||
840cb59c | 1200 | health_code_update(); |
86acf0da | 1201 | |
852d0037 | 1202 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1203 | if (ret < 0) { |
ffe60014 DG |
1204 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1205 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1206 | "and session handle %d with ret %d", | |
1207 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1208 | } else { | |
47cb9d4a DG |
1209 | /* |
1210 | * This is normal behavior, an application can die during the | |
1211 | * creation process. Don't report an error so the execution can | |
1212 | * continue normally. | |
1213 | */ | |
1214 | ret = 0; | |
ffe60014 DG |
1215 | DBG3("UST app enable channel failed. Application is dead."); |
1216 | } | |
78f0bacd DG |
1217 | goto error; |
1218 | } | |
1219 | ||
1220 | ua_chan->enabled = 1; | |
1221 | ||
1222 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1223 | ua_chan->name, app->pid); |
78f0bacd DG |
1224 | |
1225 | error: | |
840cb59c | 1226 | health_code_update(); |
78f0bacd DG |
1227 | return ret; |
1228 | } | |
1229 | ||
edb67388 DG |
1230 | /* |
1231 | * Enable the specified event on to UST tracer for the UST session. | |
1232 | */ | |
1233 | static int enable_ust_event(struct ust_app *app, | |
1234 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1235 | { | |
1236 | int ret; | |
1237 | ||
840cb59c | 1238 | health_code_update(); |
86acf0da | 1239 | |
852d0037 | 1240 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1241 | if (ret < 0) { |
ffe60014 DG |
1242 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1243 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1244 | "and session handle %d with ret %d", | |
1245 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1246 | } else { | |
47cb9d4a DG |
1247 | /* |
1248 | * This is normal behavior, an application can die during the | |
1249 | * creation process. Don't report an error so the execution can | |
1250 | * continue normally. | |
1251 | */ | |
1252 | ret = 0; | |
ffe60014 DG |
1253 | DBG3("UST app enable event failed. Application is dead."); |
1254 | } | |
edb67388 DG |
1255 | goto error; |
1256 | } | |
1257 | ||
1258 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1259 | ua_event->attr.name, app->pid); |
edb67388 DG |
1260 | |
1261 | error: | |
840cb59c | 1262 | health_code_update(); |
edb67388 DG |
1263 | return ret; |
1264 | } | |
1265 | ||
099e26bd | 1266 | /* |
7972aab2 | 1267 | * Send channel and stream buffer to application. |
4f3ab6ee | 1268 | * |
ffe60014 | 1269 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1270 | */ |
7972aab2 DG |
1271 | static int send_channel_pid_to_ust(struct ust_app *app, |
1272 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1273 | { |
1274 | int ret; | |
ffe60014 | 1275 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1276 | |
1277 | assert(app); | |
ffe60014 | 1278 | assert(ua_sess); |
4f3ab6ee | 1279 | assert(ua_chan); |
4f3ab6ee | 1280 | |
840cb59c | 1281 | health_code_update(); |
4f3ab6ee | 1282 | |
7972aab2 DG |
1283 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1284 | app->sock); | |
86acf0da | 1285 | |
ffe60014 DG |
1286 | /* Send channel to the application. */ |
1287 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1288 | if (ret < 0) { |
b551a063 DG |
1289 | goto error; |
1290 | } | |
1291 | ||
d88aee68 DG |
1292 | health_code_update(); |
1293 | ||
ffe60014 DG |
1294 | /* Send all streams to application. */ |
1295 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1296 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1297 | if (ret < 0) { | |
1298 | goto error; | |
1299 | } | |
1300 | /* We don't need the stream anymore once sent to the tracer. */ | |
1301 | cds_list_del(&stream->list); | |
1302 | delete_ust_app_stream(-1, stream); | |
1303 | } | |
ffe60014 DG |
1304 | /* Flag the channel that it is sent to the application. */ |
1305 | ua_chan->is_sent = 1; | |
ffe60014 | 1306 | |
b551a063 | 1307 | error: |
840cb59c | 1308 | health_code_update(); |
b551a063 DG |
1309 | return ret; |
1310 | } | |
1311 | ||
91d76f53 | 1312 | /* |
5b4a0ec0 | 1313 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1314 | * |
1315 | * Should be called with session mutex held. | |
91d76f53 | 1316 | */ |
edb67388 DG |
1317 | static |
1318 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1319 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1320 | { |
5b4a0ec0 | 1321 | int ret = 0; |
284d8f55 | 1322 | |
840cb59c | 1323 | health_code_update(); |
86acf0da | 1324 | |
5b4a0ec0 | 1325 | /* Create UST event on tracer */ |
852d0037 | 1326 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1327 | &ua_event->obj); |
1328 | if (ret < 0) { | |
ffe60014 DG |
1329 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1330 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1331 | ua_event->attr.name, app->pid, ret); | |
1332 | } else { | |
47cb9d4a DG |
1333 | /* |
1334 | * This is normal behavior, an application can die during the | |
1335 | * creation process. Don't report an error so the execution can | |
1336 | * continue normally. | |
1337 | */ | |
1338 | ret = 0; | |
ffe60014 DG |
1339 | DBG3("UST app create event failed. Application is dead."); |
1340 | } | |
5b4a0ec0 | 1341 | goto error; |
91d76f53 | 1342 | } |
f6a9efaa | 1343 | |
5b4a0ec0 | 1344 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1345 | |
5b4a0ec0 | 1346 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1347 | ua_event->attr.name, app->pid); |
f6a9efaa | 1348 | |
840cb59c | 1349 | health_code_update(); |
86acf0da | 1350 | |
025faf73 DG |
1351 | /* Set filter if one is present. */ |
1352 | if (ua_event->filter) { | |
1353 | ret = set_ust_event_filter(ua_event, app); | |
1354 | if (ret < 0) { | |
1355 | goto error; | |
1356 | } | |
1357 | } | |
1358 | ||
8535a6d9 | 1359 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 1360 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
1361 | ret = disable_ust_event(app, ua_sess, ua_event); |
1362 | if (ret < 0) { | |
fc34caaa DG |
1363 | /* |
1364 | * If we hit an EPERM, something is wrong with our disable call. If | |
1365 | * we get an EEXIST, there is a problem on the tracer side since we | |
1366 | * just created it. | |
1367 | */ | |
1368 | switch (ret) { | |
49c336c1 | 1369 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1370 | /* Code flow problem */ |
1371 | assert(0); | |
49c336c1 | 1372 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1373 | /* It's OK for our use case. */ |
1374 | ret = 0; | |
1375 | break; | |
1376 | default: | |
1377 | break; | |
1378 | } | |
8535a6d9 DG |
1379 | goto error; |
1380 | } | |
1381 | } | |
1382 | ||
5b4a0ec0 | 1383 | error: |
840cb59c | 1384 | health_code_update(); |
5b4a0ec0 | 1385 | return ret; |
91d76f53 | 1386 | } |
48842b30 | 1387 | |
5b4a0ec0 DG |
1388 | /* |
1389 | * Copy data between an UST app event and a LTT event. | |
1390 | */ | |
421cb601 | 1391 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1392 | struct ltt_ust_event *uevent) |
1393 | { | |
1394 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); | |
1395 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1396 | ||
fc34caaa DG |
1397 | ua_event->enabled = uevent->enabled; |
1398 | ||
5b4a0ec0 DG |
1399 | /* Copy event attributes */ |
1400 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1401 | ||
53a80697 MD |
1402 | /* Copy filter bytecode */ |
1403 | if (uevent->filter) { | |
025faf73 DG |
1404 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1405 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1406 | } |
48842b30 DG |
1407 | } |
1408 | ||
5b4a0ec0 DG |
1409 | /* |
1410 | * Copy data between an UST app channel and a LTT channel. | |
1411 | */ | |
421cb601 | 1412 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1413 | struct ltt_ust_channel *uchan) |
1414 | { | |
bec39940 | 1415 | struct lttng_ht_iter iter; |
48842b30 | 1416 | struct ltt_ust_event *uevent; |
55cc08a6 | 1417 | struct ltt_ust_context *uctx; |
48842b30 | 1418 | struct ust_app_event *ua_event; |
55cc08a6 | 1419 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1420 | |
fc34caaa | 1421 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1422 | |
1423 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1424 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1425 | |
1624d5b7 JD |
1426 | ua_chan->tracefile_size = uchan->tracefile_size; |
1427 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1428 | ||
ffe60014 DG |
1429 | /* Copy event attributes since the layout is different. */ |
1430 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1431 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1432 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1433 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1434 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1435 | ua_chan->attr.output = uchan->attr.output; | |
1436 | /* | |
1437 | * Note that the attribute channel type is not set since the channel on the | |
1438 | * tracing registry side does not have this information. | |
1439 | */ | |
48842b30 | 1440 | |
fc34caaa | 1441 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1442 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1443 | |
4623416f | 1444 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
55cc08a6 DG |
1445 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1446 | if (ua_ctx == NULL) { | |
1447 | continue; | |
1448 | } | |
bec39940 DG |
1449 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1450 | (unsigned long) ua_ctx->ctx.ctx); | |
1451 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
4623416f | 1452 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1453 | } |
48842b30 | 1454 | |
421cb601 | 1455 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1456 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b DG |
1457 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
1458 | uevent->filter, uevent->attr.loglevel); | |
1459 | if (ua_event == NULL) { | |
421cb601 | 1460 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1461 | uevent->attr.name); |
284d8f55 | 1462 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1463 | if (ua_event == NULL) { |
5b4a0ec0 | 1464 | continue; |
48842b30 | 1465 | } |
421cb601 | 1466 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1467 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1468 | } |
48842b30 DG |
1469 | } |
1470 | ||
fc34caaa | 1471 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1472 | } |
1473 | ||
5b4a0ec0 DG |
1474 | /* |
1475 | * Copy data between a UST app session and a regular LTT session. | |
1476 | */ | |
421cb601 | 1477 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1478 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1479 | { |
bec39940 DG |
1480 | struct lttng_ht_node_str *ua_chan_node; |
1481 | struct lttng_ht_iter iter; | |
48842b30 DG |
1482 | struct ltt_ust_channel *uchan; |
1483 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1484 | time_t rawtime; |
1485 | struct tm *timeinfo; | |
1486 | char datetime[16]; | |
1487 | int ret; | |
1488 | ||
1489 | /* Get date and time for unique app path */ | |
1490 | time(&rawtime); | |
1491 | timeinfo = localtime(&rawtime); | |
1492 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1493 | |
421cb601 | 1494 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1495 | |
7972aab2 DG |
1496 | ua_sess->tracing_id = usess->id; |
1497 | ua_sess->id = get_next_session_id(); | |
1498 | ua_sess->uid = app->uid; | |
1499 | ua_sess->gid = app->gid; | |
1500 | ua_sess->euid = usess->uid; | |
1501 | ua_sess->egid = usess->gid; | |
1502 | ua_sess->buffer_type = usess->buffer_type; | |
1503 | ua_sess->bits_per_long = app->bits_per_long; | |
1504 | /* There is only one consumer object per session possible. */ | |
1505 | ua_sess->consumer = usess->consumer; | |
1506 | ||
1507 | switch (ua_sess->buffer_type) { | |
1508 | case LTTNG_BUFFER_PER_PID: | |
1509 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1510 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1511 | datetime); |
1512 | break; | |
1513 | case LTTNG_BUFFER_PER_UID: | |
1514 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1515 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1516 | break; | |
1517 | default: | |
1518 | assert(0); | |
1519 | goto error; | |
1520 | } | |
477d7741 MD |
1521 | if (ret < 0) { |
1522 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1523 | assert(0); |
7972aab2 | 1524 | goto error; |
477d7741 MD |
1525 | } |
1526 | ||
48842b30 | 1527 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1528 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1529 | uchan, node.node) { | |
1530 | struct lttng_ht_iter uiter; | |
ba767faf | 1531 | |
bec39940 DG |
1532 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1533 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1534 | if (ua_chan_node != NULL) { |
fc34caaa | 1535 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1536 | continue; |
1537 | } | |
421cb601 | 1538 | |
5b4a0ec0 DG |
1539 | DBG2("Channel %s not found on shadow session copy, creating it", |
1540 | uchan->name); | |
d0b96690 | 1541 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1542 | if (ua_chan == NULL) { |
fc34caaa | 1543 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1544 | continue; |
48842b30 | 1545 | } |
5b4a0ec0 | 1546 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1547 | /* |
1548 | * The concept of metadata channel does not exist on the tracing | |
1549 | * registry side of the session daemon so this can only be a per CPU | |
1550 | * channel and not metadata. | |
1551 | */ | |
1552 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1553 | ||
bec39940 | 1554 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1555 | } |
7972aab2 DG |
1556 | |
1557 | error: | |
1558 | return; | |
48842b30 DG |
1559 | } |
1560 | ||
78f0bacd DG |
1561 | /* |
1562 | * Lookup sesison wrapper. | |
1563 | */ | |
84cd17c6 MD |
1564 | static |
1565 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1566 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1567 | { |
1568 | /* Get right UST app session from app */ | |
77c5447b | 1569 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1570 | } |
1571 | ||
421cb601 DG |
1572 | /* |
1573 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1574 | * id. |
421cb601 | 1575 | */ |
48842b30 DG |
1576 | static struct ust_app_session *lookup_session_by_app( |
1577 | struct ltt_ust_session *usess, struct ust_app *app) | |
1578 | { | |
bec39940 | 1579 | struct lttng_ht_iter iter; |
77c5447b | 1580 | struct lttng_ht_node_u64 *node; |
48842b30 | 1581 | |
84cd17c6 | 1582 | __lookup_session_by_app(usess, app, &iter); |
77c5447b | 1583 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1584 | if (node == NULL) { |
1585 | goto error; | |
1586 | } | |
1587 | ||
1588 | return caa_container_of(node, struct ust_app_session, node); | |
1589 | ||
1590 | error: | |
1591 | return NULL; | |
1592 | } | |
1593 | ||
7972aab2 DG |
1594 | /* |
1595 | * Setup buffer registry per PID for the given session and application. If none | |
1596 | * is found, a new one is created, added to the global registry and | |
1597 | * initialized. If regp is valid, it's set with the newly created object. | |
1598 | * | |
1599 | * Return 0 on success or else a negative value. | |
1600 | */ | |
1601 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1602 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1603 | { | |
1604 | int ret = 0; | |
1605 | struct buffer_reg_pid *reg_pid; | |
1606 | ||
1607 | assert(ua_sess); | |
1608 | assert(app); | |
1609 | ||
1610 | rcu_read_lock(); | |
1611 | ||
1612 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1613 | if (!reg_pid) { | |
1614 | /* | |
1615 | * This is the create channel path meaning that if there is NO | |
1616 | * registry available, we have to create one for this session. | |
1617 | */ | |
1618 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1619 | if (ret < 0) { | |
1620 | goto error; | |
1621 | } | |
1622 | buffer_reg_pid_add(reg_pid); | |
1623 | } else { | |
1624 | goto end; | |
1625 | } | |
1626 | ||
1627 | /* Initialize registry. */ | |
1628 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1629 | app->bits_per_long, app->uint8_t_alignment, | |
1630 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1631 | app->uint64_t_alignment, app->long_alignment, |
1632 | app->byte_order, app->version.major, | |
1633 | app->version.minor); | |
7972aab2 DG |
1634 | if (ret < 0) { |
1635 | goto error; | |
1636 | } | |
1637 | ||
1638 | DBG3("UST app buffer registry per PID created successfully"); | |
1639 | ||
1640 | end: | |
1641 | if (regp) { | |
1642 | *regp = reg_pid; | |
1643 | } | |
1644 | error: | |
1645 | rcu_read_unlock(); | |
1646 | return ret; | |
1647 | } | |
1648 | ||
1649 | /* | |
1650 | * Setup buffer registry per UID for the given session and application. If none | |
1651 | * is found, a new one is created, added to the global registry and | |
1652 | * initialized. If regp is valid, it's set with the newly created object. | |
1653 | * | |
1654 | * Return 0 on success or else a negative value. | |
1655 | */ | |
1656 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1657 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1658 | { | |
1659 | int ret = 0; | |
1660 | struct buffer_reg_uid *reg_uid; | |
1661 | ||
1662 | assert(usess); | |
1663 | assert(app); | |
1664 | ||
1665 | rcu_read_lock(); | |
1666 | ||
1667 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1668 | if (!reg_uid) { | |
1669 | /* | |
1670 | * This is the create channel path meaning that if there is NO | |
1671 | * registry available, we have to create one for this session. | |
1672 | */ | |
1673 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1674 | LTTNG_DOMAIN_UST, ®_uid); | |
1675 | if (ret < 0) { | |
1676 | goto error; | |
1677 | } | |
1678 | buffer_reg_uid_add(reg_uid); | |
1679 | } else { | |
1680 | goto end; | |
1681 | } | |
1682 | ||
1683 | /* Initialize registry. */ | |
af6142cf | 1684 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1685 | app->bits_per_long, app->uint8_t_alignment, |
1686 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1687 | app->uint64_t_alignment, app->long_alignment, |
1688 | app->byte_order, app->version.major, | |
1689 | app->version.minor); | |
7972aab2 DG |
1690 | if (ret < 0) { |
1691 | goto error; | |
1692 | } | |
1693 | /* Add node to teardown list of the session. */ | |
1694 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1695 | ||
1696 | DBG3("UST app buffer registry per UID created successfully"); | |
1697 | ||
1698 | end: | |
1699 | if (regp) { | |
1700 | *regp = reg_uid; | |
1701 | } | |
1702 | error: | |
1703 | rcu_read_unlock(); | |
1704 | return ret; | |
1705 | } | |
1706 | ||
421cb601 | 1707 | /* |
3d8ca23b | 1708 | * Create a session on the tracer side for the given app. |
421cb601 | 1709 | * |
3d8ca23b DG |
1710 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1711 | * untouched. If the session was created, is_created is set to 1. On error, | |
1712 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1713 | * be NULL. | |
1714 | * | |
1715 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1716 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1717 | */ |
3d8ca23b DG |
1718 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1719 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1720 | int *is_created) | |
421cb601 | 1721 | { |
3d8ca23b | 1722 | int ret, created = 0; |
421cb601 DG |
1723 | struct ust_app_session *ua_sess; |
1724 | ||
3d8ca23b DG |
1725 | assert(usess); |
1726 | assert(app); | |
1727 | assert(ua_sess_ptr); | |
1728 | ||
840cb59c | 1729 | health_code_update(); |
86acf0da | 1730 | |
421cb601 DG |
1731 | ua_sess = lookup_session_by_app(usess, app); |
1732 | if (ua_sess == NULL) { | |
77c5447b | 1733 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 1734 | app->pid, usess->id); |
d0b96690 | 1735 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1736 | if (ua_sess == NULL) { |
1737 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1738 | ret = -ENOMEM; |
1739 | goto error; | |
421cb601 | 1740 | } |
477d7741 | 1741 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1742 | created = 1; |
421cb601 DG |
1743 | } |
1744 | ||
7972aab2 DG |
1745 | switch (usess->buffer_type) { |
1746 | case LTTNG_BUFFER_PER_PID: | |
1747 | /* Init local registry. */ | |
1748 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1749 | if (ret < 0) { |
7972aab2 DG |
1750 | goto error; |
1751 | } | |
1752 | break; | |
1753 | case LTTNG_BUFFER_PER_UID: | |
1754 | /* Look for a global registry. If none exists, create one. */ | |
1755 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1756 | if (ret < 0) { | |
1757 | goto error; | |
1758 | } | |
1759 | break; | |
1760 | default: | |
1761 | assert(0); | |
1762 | ret = -EINVAL; | |
1763 | goto error; | |
1764 | } | |
1765 | ||
1766 | health_code_update(); | |
1767 | ||
1768 | if (ua_sess->handle == -1) { | |
1769 | ret = ustctl_create_session(app->sock); | |
1770 | if (ret < 0) { | |
1771 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1772 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1773 | app->pid, ret); |
1774 | } else { | |
1775 | DBG("UST app creating session failed. Application is dead"); | |
47cb9d4a DG |
1776 | /* |
1777 | * This is normal behavior, an application can die during the | |
1778 | * creation process. Don't report an error so the execution can | |
1779 | * continue normally. This will get flagged ENOTCONN and the | |
1780 | * caller will handle it. | |
1781 | */ | |
1782 | ret = 0; | |
ffe60014 | 1783 | } |
d0b96690 | 1784 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1785 | if (ret != -ENOMEM) { |
1786 | /* | |
1787 | * Tracer is probably gone or got an internal error so let's | |
1788 | * behave like it will soon unregister or not usable. | |
1789 | */ | |
1790 | ret = -ENOTCONN; | |
1791 | } | |
1792 | goto error; | |
421cb601 DG |
1793 | } |
1794 | ||
7972aab2 DG |
1795 | ua_sess->handle = ret; |
1796 | ||
1797 | /* Add ust app session to app's HT */ | |
77c5447b MD |
1798 | lttng_ht_node_init_u64(&ua_sess->node, |
1799 | ua_sess->tracing_id); | |
1800 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
7972aab2 DG |
1801 | |
1802 | DBG2("UST app session created successfully with handle %d", ret); | |
1803 | } | |
1804 | ||
1805 | *ua_sess_ptr = ua_sess; | |
1806 | if (is_created) { | |
1807 | *is_created = created; | |
1808 | } | |
1809 | ||
1810 | /* Everything went well. */ | |
1811 | ret = 0; | |
1812 | ||
1813 | error: | |
1814 | health_code_update(); | |
1815 | return ret; | |
1816 | } | |
1817 | ||
1818 | /* | |
1819 | * Create a context for the channel on the tracer. | |
1820 | * | |
1821 | * Called with UST app session lock held and a RCU read side lock. | |
1822 | */ | |
1823 | static | |
1824 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1825 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1826 | struct ust_app *app) | |
1827 | { | |
1828 | int ret = 0; | |
1829 | struct lttng_ht_iter iter; | |
1830 | struct lttng_ht_node_ulong *node; | |
1831 | struct ust_app_ctx *ua_ctx; | |
1832 | ||
1833 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1834 | ||
1835 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); | |
1836 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1837 | if (node != NULL) { | |
1838 | ret = -EEXIST; | |
1839 | goto error; | |
1840 | } | |
1841 | ||
1842 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1843 | if (ua_ctx == NULL) { | |
1844 | /* malloc failed */ | |
1845 | ret = -1; | |
1846 | goto error; | |
1847 | } | |
1848 | ||
1849 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
1850 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
4623416f | 1851 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
1852 | |
1853 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1854 | if (ret < 0) { | |
1855 | goto error; | |
1856 | } | |
1857 | ||
1858 | error: | |
1859 | return ret; | |
1860 | } | |
1861 | ||
1862 | /* | |
1863 | * Enable on the tracer side a ust app event for the session and channel. | |
1864 | * | |
1865 | * Called with UST app session lock held. | |
1866 | */ | |
1867 | static | |
1868 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
1869 | struct ust_app_event *ua_event, struct ust_app *app) | |
1870 | { | |
1871 | int ret; | |
1872 | ||
1873 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1874 | if (ret < 0) { | |
1875 | goto error; | |
1876 | } | |
1877 | ||
1878 | ua_event->enabled = 1; | |
1879 | ||
1880 | error: | |
1881 | return ret; | |
1882 | } | |
1883 | ||
1884 | /* | |
1885 | * Disable on the tracer side a ust app event for the session and channel. | |
1886 | */ | |
1887 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
1888 | struct ust_app_event *ua_event, struct ust_app *app) | |
1889 | { | |
1890 | int ret; | |
1891 | ||
1892 | ret = disable_ust_event(app, ua_sess, ua_event); | |
1893 | if (ret < 0) { | |
1894 | goto error; | |
1895 | } | |
1896 | ||
1897 | ua_event->enabled = 0; | |
1898 | ||
1899 | error: | |
1900 | return ret; | |
1901 | } | |
1902 | ||
1903 | /* | |
1904 | * Lookup ust app channel for session and disable it on the tracer side. | |
1905 | */ | |
1906 | static | |
1907 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
1908 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
1909 | { | |
1910 | int ret; | |
1911 | ||
1912 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
1913 | if (ret < 0) { | |
1914 | goto error; | |
1915 | } | |
1916 | ||
1917 | ua_chan->enabled = 0; | |
1918 | ||
1919 | error: | |
1920 | return ret; | |
1921 | } | |
1922 | ||
1923 | /* | |
1924 | * Lookup ust app channel for session and enable it on the tracer side. This | |
1925 | * MUST be called with a RCU read side lock acquired. | |
1926 | */ | |
1927 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
1928 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
1929 | { | |
1930 | int ret = 0; | |
1931 | struct lttng_ht_iter iter; | |
1932 | struct lttng_ht_node_str *ua_chan_node; | |
1933 | struct ust_app_channel *ua_chan; | |
1934 | ||
1935 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
1936 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
1937 | if (ua_chan_node == NULL) { | |
77c5447b | 1938 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
1939 | uchan->name, ua_sess->tracing_id); |
1940 | goto error; | |
1941 | } | |
1942 | ||
1943 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
1944 | ||
1945 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
1946 | if (ret < 0) { | |
1947 | goto error; | |
1948 | } | |
1949 | ||
1950 | error: | |
1951 | return ret; | |
1952 | } | |
1953 | ||
1954 | /* | |
1955 | * Ask the consumer to create a channel and get it if successful. | |
1956 | * | |
1957 | * Return 0 on success or else a negative value. | |
1958 | */ | |
1959 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
1960 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
1961 | int bitness, struct ust_registry_session *registry) | |
1962 | { | |
1963 | int ret; | |
1964 | unsigned int nb_fd = 0; | |
1965 | struct consumer_socket *socket; | |
1966 | ||
1967 | assert(usess); | |
1968 | assert(ua_sess); | |
1969 | assert(ua_chan); | |
1970 | assert(registry); | |
1971 | ||
1972 | rcu_read_lock(); | |
1973 | health_code_update(); | |
1974 | ||
1975 | /* Get the right consumer socket for the application. */ | |
1976 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
1977 | if (!socket) { | |
1978 | ret = -EINVAL; | |
1979 | goto error; | |
1980 | } | |
1981 | ||
1982 | health_code_update(); | |
1983 | ||
1984 | /* Need one fd for the channel. */ | |
1985 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
1986 | if (ret < 0) { | |
1987 | ERR("Exhausted number of available FD upon create channel"); | |
1988 | goto error; | |
1989 | } | |
1990 | ||
1991 | /* | |
1992 | * Ask consumer to create channel. The consumer will return the number of | |
1993 | * stream we have to expect. | |
1994 | */ | |
1995 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
1996 | registry); | |
1997 | if (ret < 0) { | |
1998 | goto error_ask; | |
1999 | } | |
2000 | ||
2001 | /* | |
2002 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2003 | * stream (2 being the default value here). | |
2004 | */ | |
2005 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2006 | ||
2007 | /* Reserve the amount of file descriptor we need. */ | |
2008 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2009 | if (ret < 0) { | |
2010 | ERR("Exhausted number of available FD upon create channel"); | |
2011 | goto error_fd_get_stream; | |
2012 | } | |
2013 | ||
2014 | health_code_update(); | |
2015 | ||
2016 | /* | |
2017 | * Now get the channel from the consumer. This call wil populate the stream | |
2018 | * list of that channel and set the ust objects. | |
2019 | */ | |
d9078d0c DG |
2020 | if (usess->consumer->enabled) { |
2021 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2022 | if (ret < 0) { | |
2023 | goto error_destroy; | |
2024 | } | |
7972aab2 DG |
2025 | } |
2026 | ||
2027 | rcu_read_unlock(); | |
2028 | return 0; | |
2029 | ||
2030 | error_destroy: | |
2031 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2032 | error_fd_get_stream: | |
2033 | /* | |
2034 | * Initiate a destroy channel on the consumer since we had an error | |
2035 | * handling it on our side. The return value is of no importance since we | |
2036 | * already have a ret value set by the previous error that we need to | |
2037 | * return. | |
2038 | */ | |
2039 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2040 | error_ask: | |
2041 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2042 | error: | |
2043 | health_code_update(); | |
2044 | rcu_read_unlock(); | |
2045 | return ret; | |
2046 | } | |
2047 | ||
2048 | /* | |
2049 | * Duplicate the ust data object of the ust app stream and save it in the | |
2050 | * buffer registry stream. | |
2051 | * | |
2052 | * Return 0 on success or else a negative value. | |
2053 | */ | |
2054 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2055 | struct ust_app_stream *stream) | |
2056 | { | |
2057 | int ret; | |
2058 | ||
2059 | assert(reg_stream); | |
2060 | assert(stream); | |
2061 | ||
2062 | /* Reserve the amount of file descriptor we need. */ | |
2063 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2064 | if (ret < 0) { | |
2065 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2066 | goto error; | |
2067 | } | |
2068 | ||
2069 | /* Duplicate object for stream once the original is in the registry. */ | |
2070 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2071 | reg_stream->obj.ust); | |
2072 | if (ret < 0) { | |
2073 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2074 | reg_stream->obj.ust, stream->obj, ret); | |
2075 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2076 | goto error; | |
2077 | } | |
2078 | stream->handle = stream->obj->handle; | |
2079 | ||
2080 | error: | |
2081 | return ret; | |
2082 | } | |
2083 | ||
2084 | /* | |
2085 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2086 | * buffer registry channel. | |
2087 | * | |
2088 | * Return 0 on success or else a negative value. | |
2089 | */ | |
2090 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2091 | struct ust_app_channel *ua_chan) | |
2092 | { | |
2093 | int ret; | |
2094 | ||
2095 | assert(reg_chan); | |
2096 | assert(ua_chan); | |
2097 | ||
2098 | /* Need two fds for the channel. */ | |
2099 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2100 | if (ret < 0) { | |
2101 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2102 | goto error_fd_get; | |
2103 | } | |
2104 | ||
2105 | /* Duplicate object for stream once the original is in the registry. */ | |
2106 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2107 | if (ret < 0) { | |
2108 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2109 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2110 | goto error; | |
2111 | } | |
2112 | ua_chan->handle = ua_chan->obj->handle; | |
2113 | ||
2114 | return 0; | |
2115 | ||
2116 | error: | |
2117 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2118 | error_fd_get: | |
2119 | return ret; | |
2120 | } | |
2121 | ||
2122 | /* | |
2123 | * For a given channel buffer registry, setup all streams of the given ust | |
2124 | * application channel. | |
2125 | * | |
2126 | * Return 0 on success or else a negative value. | |
2127 | */ | |
2128 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2129 | struct ust_app_channel *ua_chan) | |
2130 | { | |
2131 | int ret = 0; | |
2132 | struct ust_app_stream *stream, *stmp; | |
2133 | ||
2134 | assert(reg_chan); | |
2135 | assert(ua_chan); | |
2136 | ||
2137 | DBG2("UST app setup buffer registry stream"); | |
2138 | ||
2139 | /* Send all streams to application. */ | |
2140 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2141 | struct buffer_reg_stream *reg_stream; | |
2142 | ||
2143 | ret = buffer_reg_stream_create(®_stream); | |
2144 | if (ret < 0) { | |
2145 | goto error; | |
2146 | } | |
2147 | ||
2148 | /* | |
2149 | * Keep original pointer and nullify it in the stream so the delete | |
2150 | * stream call does not release the object. | |
2151 | */ | |
2152 | reg_stream->obj.ust = stream->obj; | |
2153 | stream->obj = NULL; | |
2154 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2155 | |
7972aab2 DG |
2156 | /* We don't need the streams anymore. */ |
2157 | cds_list_del(&stream->list); | |
2158 | delete_ust_app_stream(-1, stream); | |
2159 | } | |
421cb601 | 2160 | |
7972aab2 DG |
2161 | error: |
2162 | return ret; | |
2163 | } | |
2164 | ||
2165 | /* | |
2166 | * Create a buffer registry channel for the given session registry and | |
2167 | * application channel object. If regp pointer is valid, it's set with the | |
2168 | * created object. Important, the created object is NOT added to the session | |
2169 | * registry hash table. | |
2170 | * | |
2171 | * Return 0 on success else a negative value. | |
2172 | */ | |
2173 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2174 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2175 | { | |
2176 | int ret; | |
2177 | struct buffer_reg_channel *reg_chan = NULL; | |
2178 | ||
2179 | assert(reg_sess); | |
2180 | assert(ua_chan); | |
2181 | ||
2182 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2183 | ||
2184 | /* Create buffer registry channel. */ | |
2185 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2186 | if (ret < 0) { | |
2187 | goto error_create; | |
421cb601 | 2188 | } |
7972aab2 DG |
2189 | assert(reg_chan); |
2190 | reg_chan->consumer_key = ua_chan->key; | |
421cb601 | 2191 | |
7972aab2 DG |
2192 | /* Create and add a channel registry to session. */ |
2193 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2194 | ua_chan->tracing_channel_id); | |
2195 | if (ret < 0) { | |
2196 | goto error; | |
d88aee68 | 2197 | } |
7972aab2 | 2198 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2199 | |
7972aab2 DG |
2200 | if (regp) { |
2201 | *regp = reg_chan; | |
3d8ca23b | 2202 | } |
d88aee68 | 2203 | |
7972aab2 | 2204 | return 0; |
3d8ca23b DG |
2205 | |
2206 | error: | |
7972aab2 DG |
2207 | /* Safe because the registry channel object was not added to any HT. */ |
2208 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2209 | error_create: | |
3d8ca23b | 2210 | return ret; |
421cb601 DG |
2211 | } |
2212 | ||
55cc08a6 | 2213 | /* |
7972aab2 DG |
2214 | * Setup buffer registry channel for the given session registry and application |
2215 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2216 | * |
7972aab2 | 2217 | * Return 0 on success else a negative value. |
55cc08a6 | 2218 | */ |
7972aab2 DG |
2219 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2220 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2221 | { |
7972aab2 | 2222 | int ret; |
55cc08a6 | 2223 | |
7972aab2 DG |
2224 | assert(reg_sess); |
2225 | assert(reg_chan); | |
2226 | assert(ua_chan); | |
2227 | assert(ua_chan->obj); | |
55cc08a6 | 2228 | |
7972aab2 | 2229 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2230 | |
7972aab2 DG |
2231 | /* Setup all streams for the registry. */ |
2232 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2233 | if (ret < 0) { | |
55cc08a6 DG |
2234 | goto error; |
2235 | } | |
2236 | ||
7972aab2 DG |
2237 | reg_chan->obj.ust = ua_chan->obj; |
2238 | ua_chan->obj = NULL; | |
55cc08a6 | 2239 | |
7972aab2 | 2240 | return 0; |
55cc08a6 DG |
2241 | |
2242 | error: | |
7972aab2 DG |
2243 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2244 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2245 | return ret; |
2246 | } | |
2247 | ||
edb67388 | 2248 | /* |
7972aab2 | 2249 | * Send buffer registry channel to the application. |
d0b96690 | 2250 | * |
7972aab2 | 2251 | * Return 0 on success else a negative value. |
edb67388 | 2252 | */ |
7972aab2 DG |
2253 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2254 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2255 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2256 | { |
2257 | int ret; | |
7972aab2 | 2258 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2259 | |
7972aab2 DG |
2260 | assert(reg_chan); |
2261 | assert(app); | |
2262 | assert(ua_sess); | |
2263 | assert(ua_chan); | |
2264 | ||
2265 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2266 | ||
2267 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2268 | if (ret < 0) { |
2269 | goto error; | |
2270 | } | |
2271 | ||
7972aab2 DG |
2272 | /* Send channel to the application. */ |
2273 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2274 | if (ret < 0) { | |
2275 | goto error; | |
2276 | } | |
2277 | ||
2278 | health_code_update(); | |
2279 | ||
2280 | /* Send all streams to application. */ | |
2281 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2282 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2283 | struct ust_app_stream stream; | |
2284 | ||
2285 | ret = duplicate_stream_object(reg_stream, &stream); | |
2286 | if (ret < 0) { | |
2287 | goto error_stream_unlock; | |
2288 | } | |
2289 | ||
2290 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2291 | if (ret < 0) { | |
8c067051 | 2292 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2293 | goto error_stream_unlock; |
2294 | } | |
edb67388 | 2295 | |
7972aab2 DG |
2296 | /* |
2297 | * The return value is not important here. This function will output an | |
2298 | * error if needed. | |
2299 | */ | |
2300 | (void) release_ust_app_stream(-1, &stream); | |
2301 | } | |
2302 | ua_chan->is_sent = 1; | |
2303 | ||
2304 | error_stream_unlock: | |
2305 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2306 | error: |
2307 | return ret; | |
2308 | } | |
2309 | ||
9730260e | 2310 | /* |
7972aab2 DG |
2311 | * Create and send to the application the created buffers with per UID buffers. |
2312 | * | |
2313 | * Return 0 on success else a negative value. | |
9730260e | 2314 | */ |
7972aab2 DG |
2315 | static int create_channel_per_uid(struct ust_app *app, |
2316 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2317 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2318 | { |
2319 | int ret; | |
7972aab2 DG |
2320 | struct buffer_reg_uid *reg_uid; |
2321 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2322 | |
7972aab2 DG |
2323 | assert(app); |
2324 | assert(usess); | |
2325 | assert(ua_sess); | |
2326 | assert(ua_chan); | |
2327 | ||
2328 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2329 | ||
2330 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2331 | /* | |
2332 | * The session creation handles the creation of this global registry | |
2333 | * object. If none can be find, there is a code flow problem or a | |
2334 | * teardown race. | |
2335 | */ | |
2336 | assert(reg_uid); | |
2337 | ||
2338 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2339 | reg_uid); | |
2340 | if (!reg_chan) { | |
2341 | /* Create the buffer registry channel object. */ | |
2342 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2343 | if (ret < 0) { | |
2344 | goto error; | |
2345 | } | |
2346 | assert(reg_chan); | |
2347 | ||
2348 | /* | |
2349 | * Create the buffers on the consumer side. This call populates the | |
2350 | * ust app channel object with all streams and data object. | |
2351 | */ | |
2352 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2353 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2354 | if (ret < 0) { | |
07d2ae95 DG |
2355 | /* |
2356 | * Let's remove the previously created buffer registry channel so | |
2357 | * it's not visible anymore in the session registry. | |
2358 | */ | |
2359 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2360 | ua_chan->tracing_channel_id); | |
2361 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2362 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2363 | goto error; |
2364 | } | |
2365 | ||
2366 | /* | |
2367 | * Setup the streams and add it to the session registry. | |
2368 | */ | |
2369 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2370 | if (ret < 0) { | |
2371 | goto error; | |
2372 | } | |
2373 | ||
2374 | } | |
2375 | ||
2376 | /* Send buffers to the application. */ | |
2377 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2378 | if (ret < 0) { |
2379 | goto error; | |
2380 | } | |
2381 | ||
9730260e DG |
2382 | error: |
2383 | return ret; | |
2384 | } | |
2385 | ||
78f0bacd | 2386 | /* |
7972aab2 DG |
2387 | * Create and send to the application the created buffers with per PID buffers. |
2388 | * | |
2389 | * Return 0 on success else a negative value. | |
78f0bacd | 2390 | */ |
7972aab2 DG |
2391 | static int create_channel_per_pid(struct ust_app *app, |
2392 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2393 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2394 | { |
8535a6d9 | 2395 | int ret; |
7972aab2 | 2396 | struct ust_registry_session *registry; |
78f0bacd | 2397 | |
7972aab2 DG |
2398 | assert(app); |
2399 | assert(usess); | |
2400 | assert(ua_sess); | |
2401 | assert(ua_chan); | |
2402 | ||
2403 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2404 | ||
2405 | rcu_read_lock(); | |
2406 | ||
2407 | registry = get_session_registry(ua_sess); | |
2408 | assert(registry); | |
2409 | ||
2410 | /* Create and add a new channel registry to session. */ | |
2411 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2412 | if (ret < 0) { |
2413 | goto error; | |
2414 | } | |
2415 | ||
7972aab2 DG |
2416 | /* Create and get channel on the consumer side. */ |
2417 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2418 | app->bits_per_long, registry); | |
2419 | if (ret < 0) { | |
2420 | goto error; | |
2421 | } | |
2422 | ||
2423 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2424 | if (ret < 0) { | |
2425 | goto error; | |
2426 | } | |
8535a6d9 | 2427 | |
78f0bacd | 2428 | error: |
7972aab2 | 2429 | rcu_read_unlock(); |
78f0bacd DG |
2430 | return ret; |
2431 | } | |
2432 | ||
2433 | /* | |
7972aab2 DG |
2434 | * From an already allocated ust app channel, create the channel buffers if |
2435 | * need and send it to the application. This MUST be called with a RCU read | |
2436 | * side lock acquired. | |
2437 | * | |
2438 | * Return 0 on success or else a negative value. | |
78f0bacd | 2439 | */ |
7972aab2 DG |
2440 | static int do_create_channel(struct ust_app *app, |
2441 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2442 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2443 | { |
7972aab2 | 2444 | int ret; |
78f0bacd | 2445 | |
7972aab2 DG |
2446 | assert(app); |
2447 | assert(usess); | |
2448 | assert(ua_sess); | |
2449 | assert(ua_chan); | |
2450 | ||
2451 | /* Handle buffer type before sending the channel to the application. */ | |
2452 | switch (usess->buffer_type) { | |
2453 | case LTTNG_BUFFER_PER_UID: | |
2454 | { | |
2455 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2456 | if (ret < 0) { | |
2457 | goto error; | |
2458 | } | |
2459 | break; | |
2460 | } | |
2461 | case LTTNG_BUFFER_PER_PID: | |
2462 | { | |
2463 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2464 | if (ret < 0) { | |
2465 | goto error; | |
2466 | } | |
2467 | break; | |
2468 | } | |
2469 | default: | |
2470 | assert(0); | |
2471 | ret = -EINVAL; | |
78f0bacd DG |
2472 | goto error; |
2473 | } | |
2474 | ||
7972aab2 DG |
2475 | /* Initialize ust objd object using the received handle and add it. */ |
2476 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2477 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2478 | |
7972aab2 DG |
2479 | /* If channel is not enabled, disable it on the tracer */ |
2480 | if (!ua_chan->enabled) { | |
2481 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2482 | if (ret < 0) { | |
2483 | goto error; | |
2484 | } | |
78f0bacd DG |
2485 | } |
2486 | ||
2487 | error: | |
2488 | return ret; | |
2489 | } | |
2490 | ||
284d8f55 | 2491 | /* |
4d710ac2 DG |
2492 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2493 | * newly created channel if not NULL. | |
d0b96690 | 2494 | * |
36b588ed | 2495 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2496 | * |
2497 | * Return 0 on success or else a negative value. | |
284d8f55 | 2498 | */ |
4d710ac2 DG |
2499 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2500 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2501 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2502 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2503 | { |
2504 | int ret = 0; | |
bec39940 DG |
2505 | struct lttng_ht_iter iter; |
2506 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2507 | struct ust_app_channel *ua_chan; |
2508 | ||
2509 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2510 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2511 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2512 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2513 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2514 | goto end; |
5b4a0ec0 DG |
2515 | } |
2516 | ||
d0b96690 | 2517 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2518 | if (ua_chan == NULL) { |
2519 | /* Only malloc can fail here */ | |
4d710ac2 | 2520 | ret = -ENOMEM; |
094d1690 | 2521 | goto error_alloc; |
fc34caaa DG |
2522 | } |
2523 | shadow_copy_channel(ua_chan, uchan); | |
2524 | ||
ffe60014 DG |
2525 | /* Set channel type. */ |
2526 | ua_chan->attr.type = type; | |
2527 | ||
7972aab2 | 2528 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2529 | if (ret < 0) { |
2530 | goto error; | |
2531 | } | |
2532 | ||
fc34caaa | 2533 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2534 | app->pid); |
fc34caaa | 2535 | |
d0b96690 DG |
2536 | /* Only add the channel if successful on the tracer side. */ |
2537 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2538 | ||
fc34caaa | 2539 | end: |
4d710ac2 DG |
2540 | if (ua_chanp) { |
2541 | *ua_chanp = ua_chan; | |
2542 | } | |
2543 | ||
2544 | /* Everything went well. */ | |
2545 | return 0; | |
5b4a0ec0 DG |
2546 | |
2547 | error: | |
d0b96690 | 2548 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2549 | error_alloc: |
4d710ac2 | 2550 | return ret; |
5b4a0ec0 DG |
2551 | } |
2552 | ||
2553 | /* | |
2554 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2555 | * |
2556 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2557 | */ |
edb67388 DG |
2558 | static |
2559 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2560 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2561 | struct ust_app *app) | |
284d8f55 | 2562 | { |
edb67388 | 2563 | int ret = 0; |
5b4a0ec0 | 2564 | struct ust_app_event *ua_event; |
284d8f55 | 2565 | |
5b4a0ec0 | 2566 | /* Get event node */ |
18eace3b DG |
2567 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
2568 | uevent->filter, uevent->attr.loglevel); | |
2569 | if (ua_event != NULL) { | |
fc34caaa | 2570 | ret = -EEXIST; |
edb67388 DG |
2571 | goto end; |
2572 | } | |
5b4a0ec0 | 2573 | |
edb67388 DG |
2574 | /* Does not exist so create one */ |
2575 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2576 | if (ua_event == NULL) { | |
2577 | /* Only malloc can failed so something is really wrong */ | |
2578 | ret = -ENOMEM; | |
fc34caaa | 2579 | goto end; |
5b4a0ec0 | 2580 | } |
edb67388 | 2581 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2582 | |
edb67388 | 2583 | /* Create it on the tracer side */ |
5b4a0ec0 | 2584 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2585 | if (ret < 0) { |
fc34caaa | 2586 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2587 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2588 | goto error; |
2589 | } | |
2590 | ||
d0b96690 | 2591 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2592 | |
fc34caaa | 2593 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2594 | app->pid); |
7f79d3a1 | 2595 | |
edb67388 | 2596 | end: |
fc34caaa DG |
2597 | return ret; |
2598 | ||
5b4a0ec0 | 2599 | error: |
fc34caaa DG |
2600 | /* Valid. Calling here is already in a read side lock */ |
2601 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2602 | return ret; |
5b4a0ec0 DG |
2603 | } |
2604 | ||
2605 | /* | |
2606 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2607 | * |
7972aab2 | 2608 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2609 | */ |
2610 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
d65d2de8 DG |
2611 | struct ust_app *app, struct consumer_output *consumer, |
2612 | struct ustctl_consumer_channel_attr *attr) | |
5b4a0ec0 DG |
2613 | { |
2614 | int ret = 0; | |
ffe60014 | 2615 | struct ust_app_channel *metadata; |
d88aee68 | 2616 | struct consumer_socket *socket; |
7972aab2 | 2617 | struct ust_registry_session *registry; |
5b4a0ec0 | 2618 | |
ffe60014 DG |
2619 | assert(ua_sess); |
2620 | assert(app); | |
d88aee68 | 2621 | assert(consumer); |
5b4a0ec0 | 2622 | |
7972aab2 DG |
2623 | registry = get_session_registry(ua_sess); |
2624 | assert(registry); | |
2625 | ||
1b532a60 DG |
2626 | /* Metadata already exists for this registry or it was closed previously */ |
2627 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2628 | ret = 0; |
2629 | goto error; | |
5b4a0ec0 DG |
2630 | } |
2631 | ||
ffe60014 | 2632 | /* Allocate UST metadata */ |
d0b96690 | 2633 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2634 | if (!metadata) { |
2635 | /* malloc() failed */ | |
2636 | ret = -ENOMEM; | |
2637 | goto error; | |
2638 | } | |
5b4a0ec0 | 2639 | |
d65d2de8 DG |
2640 | if (!attr) { |
2641 | /* Set default attributes for metadata. */ | |
2642 | metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
2643 | metadata->attr.subbuf_size = default_get_metadata_subbuf_size(); | |
2644 | metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
0a9c6494 DG |
2645 | metadata->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER; |
2646 | metadata->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER; | |
d65d2de8 DG |
2647 | metadata->attr.output = LTTNG_UST_MMAP; |
2648 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2649 | } else { | |
2650 | memcpy(&metadata->attr, attr, sizeof(metadata->attr)); | |
2651 | metadata->attr.output = LTTNG_UST_MMAP; | |
2652 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2653 | } | |
5b4a0ec0 | 2654 | |
7972aab2 DG |
2655 | /* Need one fd for the channel. */ |
2656 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2657 | if (ret < 0) { | |
2658 | ERR("Exhausted number of available FD upon create metadata"); | |
2659 | goto error; | |
2660 | } | |
2661 | ||
4dc3dfc5 DG |
2662 | /* Get the right consumer socket for the application. */ |
2663 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2664 | if (!socket) { | |
2665 | ret = -EINVAL; | |
2666 | goto error_consumer; | |
2667 | } | |
2668 | ||
331744e3 JD |
2669 | /* |
2670 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2671 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2672 | * consumer requesting the metadata and the ask_channel call on our side | |
2673 | * did not returned yet. | |
2674 | */ | |
2675 | registry->metadata_key = metadata->key; | |
2676 | ||
d88aee68 DG |
2677 | /* |
2678 | * Ask the metadata channel creation to the consumer. The metadata object | |
2679 | * will be created by the consumer and kept their. However, the stream is | |
2680 | * never added or monitored until we do a first push metadata to the | |
2681 | * consumer. | |
2682 | */ | |
7972aab2 DG |
2683 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2684 | registry); | |
d88aee68 | 2685 | if (ret < 0) { |
f2a444f1 DG |
2686 | /* Nullify the metadata key so we don't try to close it later on. */ |
2687 | registry->metadata_key = 0; | |
d88aee68 DG |
2688 | goto error_consumer; |
2689 | } | |
2690 | ||
2691 | /* | |
2692 | * The setup command will make the metadata stream be sent to the relayd, | |
2693 | * if applicable, and the thread managing the metadatas. This is important | |
2694 | * because after this point, if an error occurs, the only way the stream | |
2695 | * can be deleted is to be monitored in the consumer. | |
2696 | */ | |
7972aab2 | 2697 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2698 | if (ret < 0) { |
f2a444f1 DG |
2699 | /* Nullify the metadata key so we don't try to close it later on. */ |
2700 | registry->metadata_key = 0; | |
d88aee68 | 2701 | goto error_consumer; |
5b4a0ec0 DG |
2702 | } |
2703 | ||
7972aab2 DG |
2704 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2705 | metadata->key, app->pid); | |
5b4a0ec0 | 2706 | |
d88aee68 | 2707 | error_consumer: |
b80f0b6c | 2708 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2709 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2710 | error: |
ffe60014 | 2711 | return ret; |
5b4a0ec0 DG |
2712 | } |
2713 | ||
2714 | /* | |
2715 | * Return pointer to traceable apps list. | |
2716 | */ | |
bec39940 | 2717 | struct lttng_ht *ust_app_get_ht(void) |
5b4a0ec0 DG |
2718 | { |
2719 | return ust_app_ht; | |
2720 | } | |
2721 | ||
2722 | /* | |
d88aee68 DG |
2723 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2724 | * acquired before calling this function. | |
5b4a0ec0 DG |
2725 | */ |
2726 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2727 | { | |
d88aee68 | 2728 | struct ust_app *app = NULL; |
bec39940 DG |
2729 | struct lttng_ht_node_ulong *node; |
2730 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2731 | |
bec39940 DG |
2732 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2733 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2734 | if (node == NULL) { |
2735 | DBG2("UST app no found with pid %d", pid); | |
2736 | goto error; | |
2737 | } | |
5b4a0ec0 DG |
2738 | |
2739 | DBG2("Found UST app by pid %d", pid); | |
2740 | ||
d88aee68 | 2741 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2742 | |
2743 | error: | |
d88aee68 | 2744 | return app; |
5b4a0ec0 DG |
2745 | } |
2746 | ||
d88aee68 DG |
2747 | /* |
2748 | * Allocate and init an UST app object using the registration information and | |
2749 | * the command socket. This is called when the command socket connects to the | |
2750 | * session daemon. | |
2751 | * | |
2752 | * The object is returned on success or else NULL. | |
2753 | */ | |
d0b96690 | 2754 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2755 | { |
d0b96690 DG |
2756 | struct ust_app *lta = NULL; |
2757 | ||
2758 | assert(msg); | |
2759 | assert(sock >= 0); | |
2760 | ||
2761 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2762 | |
173af62f DG |
2763 | if ((msg->bits_per_long == 64 && |
2764 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2765 | || (msg->bits_per_long == 32 && | |
2766 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2767 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2768 | "%d-bit long, but no consumerd for this size is available.\n", |
2769 | msg->name, msg->pid, msg->bits_per_long); | |
2770 | goto error; | |
3f2c5fcc | 2771 | } |
d0b96690 | 2772 | |
5b4a0ec0 DG |
2773 | lta = zmalloc(sizeof(struct ust_app)); |
2774 | if (lta == NULL) { | |
2775 | PERROR("malloc"); | |
d0b96690 | 2776 | goto error; |
5b4a0ec0 DG |
2777 | } |
2778 | ||
2779 | lta->ppid = msg->ppid; | |
2780 | lta->uid = msg->uid; | |
2781 | lta->gid = msg->gid; | |
d0b96690 | 2782 | |
7753dea8 | 2783 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2784 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2785 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2786 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2787 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2788 | lta->long_alignment = msg->long_alignment; | |
2789 | lta->byte_order = msg->byte_order; | |
2790 | ||
5b4a0ec0 DG |
2791 | lta->v_major = msg->major; |
2792 | lta->v_minor = msg->minor; | |
77c5447b | 2793 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 DG |
2794 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2795 | lta->notify_sock = -1; | |
d88aee68 DG |
2796 | |
2797 | /* Copy name and make sure it's NULL terminated. */ | |
2798 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2799 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2800 | ||
2801 | /* | |
2802 | * Before this can be called, when receiving the registration information, | |
2803 | * the application compatibility is checked. So, at this point, the | |
2804 | * application can work with this session daemon. | |
2805 | */ | |
d0b96690 | 2806 | lta->compatible = 1; |
5b4a0ec0 | 2807 | |
852d0037 | 2808 | lta->pid = msg->pid; |
d0b96690 | 2809 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2810 | lta->sock = sock; |
d0b96690 | 2811 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2812 | |
d42f20df DG |
2813 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2814 | ||
d0b96690 DG |
2815 | error: |
2816 | return lta; | |
2817 | } | |
2818 | ||
d88aee68 DG |
2819 | /* |
2820 | * For a given application object, add it to every hash table. | |
2821 | */ | |
d0b96690 DG |
2822 | void ust_app_add(struct ust_app *app) |
2823 | { | |
2824 | assert(app); | |
2825 | assert(app->notify_sock >= 0); | |
2826 | ||
5b4a0ec0 | 2827 | rcu_read_lock(); |
852d0037 DG |
2828 | |
2829 | /* | |
2830 | * On a re-registration, we want to kick out the previous registration of | |
2831 | * that pid | |
2832 | */ | |
d0b96690 | 2833 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
2834 | |
2835 | /* | |
2836 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
2837 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
2838 | * already in the table. | |
2839 | */ | |
d0b96690 | 2840 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 2841 | |
d0b96690 DG |
2842 | /* Add application to the notify socket hash table. */ |
2843 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
2844 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 2845 | |
d0b96690 | 2846 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
2847 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
2848 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
2849 | app->v_minor); | |
5b4a0ec0 | 2850 | |
d0b96690 DG |
2851 | rcu_read_unlock(); |
2852 | } | |
2853 | ||
d88aee68 DG |
2854 | /* |
2855 | * Set the application version into the object. | |
2856 | * | |
2857 | * Return 0 on success else a negative value either an errno code or a | |
2858 | * LTTng-UST error code. | |
2859 | */ | |
d0b96690 DG |
2860 | int ust_app_version(struct ust_app *app) |
2861 | { | |
d88aee68 DG |
2862 | int ret; |
2863 | ||
d0b96690 | 2864 | assert(app); |
d88aee68 DG |
2865 | |
2866 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2867 | if (ret < 0) { | |
2868 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2869 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2870 | } else { | |
2871 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2872 | } | |
2873 | } | |
2874 | ||
2875 | return ret; | |
5b4a0ec0 DG |
2876 | } |
2877 | ||
2878 | /* | |
2879 | * Unregister app by removing it from the global traceable app list and freeing | |
2880 | * the data struct. | |
2881 | * | |
2882 | * The socket is already closed at this point so no close to sock. | |
2883 | */ | |
2884 | void ust_app_unregister(int sock) | |
2885 | { | |
2886 | struct ust_app *lta; | |
bec39940 DG |
2887 | struct lttng_ht_node_ulong *node; |
2888 | struct lttng_ht_iter iter; | |
d42f20df | 2889 | struct ust_app_session *ua_sess; |
525b0740 | 2890 | int ret; |
5b4a0ec0 DG |
2891 | |
2892 | rcu_read_lock(); | |
886459c6 | 2893 | |
5b4a0ec0 | 2894 | /* Get the node reference for a call_rcu */ |
852d0037 | 2895 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 2896 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 2897 | assert(node); |
284d8f55 | 2898 | |
852d0037 | 2899 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
2900 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
2901 | ||
886459c6 | 2902 | /* Remove application from PID hash table */ |
852d0037 DG |
2903 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
2904 | assert(!ret); | |
2905 | ||
d88aee68 DG |
2906 | /* |
2907 | * Remove application from notify hash table. The thread handling the | |
2908 | * notify socket could have deleted the node so ignore on error because | |
2909 | * either way it's valid. The close of that socket is handled by the other | |
2910 | * thread. | |
2911 | */ | |
d0b96690 | 2912 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 2913 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 2914 | |
5b98a774 DG |
2915 | /* |
2916 | * Ignore return value since the node might have been removed before by an | |
2917 | * add replace during app registration because the PID can be reassigned by | |
2918 | * the OS. | |
2919 | */ | |
d0b96690 | 2920 | iter.iter.node = <a->pid_n.node; |
bec39940 | 2921 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
2922 | if (ret) { |
2923 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
2924 | lta->pid); | |
2925 | } | |
852d0037 | 2926 | |
d42f20df DG |
2927 | /* Remove sessions so they are not visible during deletion.*/ |
2928 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
2929 | node.node) { | |
7972aab2 DG |
2930 | struct ust_registry_session *registry; |
2931 | ||
d42f20df DG |
2932 | ret = lttng_ht_del(lta->sessions, &iter); |
2933 | if (ret) { | |
2934 | /* The session was already removed so scheduled for teardown. */ | |
2935 | continue; | |
2936 | } | |
2937 | ||
2938 | /* | |
2939 | * Add session to list for teardown. This is safe since at this point we | |
2940 | * are the only one using this list. | |
2941 | */ | |
d88aee68 DG |
2942 | pthread_mutex_lock(&ua_sess->lock); |
2943 | ||
2944 | /* | |
2945 | * Normally, this is done in the delete session process which is | |
2946 | * executed in the call rcu below. However, upon registration we can't | |
2947 | * afford to wait for the grace period before pushing data or else the | |
2948 | * data pending feature can race between the unregistration and stop | |
2949 | * command where the data pending command is sent *before* the grace | |
2950 | * period ended. | |
2951 | * | |
2952 | * The close metadata below nullifies the metadata pointer in the | |
2953 | * session so the delete session will NOT push/close a second time. | |
2954 | */ | |
7972aab2 | 2955 | registry = get_session_registry(ua_sess); |
1b532a60 | 2956 | if (registry && !registry->metadata_closed) { |
7972aab2 DG |
2957 | /* Push metadata for application before freeing the application. */ |
2958 | (void) push_metadata(registry, ua_sess->consumer); | |
2959 | ||
2960 | /* | |
2961 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
2962 | * metadata only on destroy trace session in this case. Also, the |
2963 | * previous push metadata could have flag the metadata registry to | |
2964 | * close so don't send a close command if closed. | |
7972aab2 | 2965 | */ |
1b532a60 DG |
2966 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
2967 | !registry->metadata_closed) { | |
7972aab2 DG |
2968 | /* And ask to close it for this session registry. */ |
2969 | (void) close_metadata(registry, ua_sess->consumer); | |
2970 | } | |
2971 | } | |
d88aee68 | 2972 | |
d42f20df | 2973 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 2974 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
2975 | } |
2976 | ||
852d0037 DG |
2977 | /* Free memory */ |
2978 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
2979 | ||
5b4a0ec0 DG |
2980 | rcu_read_unlock(); |
2981 | return; | |
284d8f55 DG |
2982 | } |
2983 | ||
2984 | /* | |
5b4a0ec0 | 2985 | * Return traceable_app_count |
284d8f55 | 2986 | */ |
5b4a0ec0 | 2987 | unsigned long ust_app_list_count(void) |
284d8f55 | 2988 | { |
5b4a0ec0 | 2989 | unsigned long count; |
284d8f55 | 2990 | |
5b4a0ec0 | 2991 | rcu_read_lock(); |
bec39940 | 2992 | count = lttng_ht_get_count(ust_app_ht); |
5b4a0ec0 | 2993 | rcu_read_unlock(); |
284d8f55 | 2994 | |
5b4a0ec0 | 2995 | return count; |
284d8f55 DG |
2996 | } |
2997 | ||
5b4a0ec0 DG |
2998 | /* |
2999 | * Fill events array with all events name of all registered apps. | |
3000 | */ | |
3001 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3002 | { |
5b4a0ec0 DG |
3003 | int ret, handle; |
3004 | size_t nbmem, count = 0; | |
bec39940 | 3005 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3006 | struct ust_app *app; |
c617c0c6 | 3007 | struct lttng_event *tmp_event; |
421cb601 | 3008 | |
5b4a0ec0 | 3009 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3010 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3011 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3012 | PERROR("zmalloc ust app events"); |
3013 | ret = -ENOMEM; | |
421cb601 DG |
3014 | goto error; |
3015 | } | |
3016 | ||
5b4a0ec0 | 3017 | rcu_read_lock(); |
421cb601 | 3018 | |
852d0037 | 3019 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3020 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3021 | |
840cb59c | 3022 | health_code_update(); |
86acf0da | 3023 | |
e0c7ec2b DG |
3024 | if (!app->compatible) { |
3025 | /* | |
3026 | * TODO: In time, we should notice the caller of this error by | |
3027 | * telling him that this is a version error. | |
3028 | */ | |
3029 | continue; | |
3030 | } | |
852d0037 | 3031 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3032 | if (handle < 0) { |
ffe60014 DG |
3033 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3034 | ERR("UST app list events getting handle failed for app pid %d", | |
3035 | app->pid); | |
3036 | } | |
5b4a0ec0 DG |
3037 | continue; |
3038 | } | |
421cb601 | 3039 | |
852d0037 | 3040 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3041 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3042 | /* Handle ustctl error. */ |
3043 | if (ret < 0) { | |
3044 | free(tmp_event); | |
3045 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3046 | ERR("UST app tp list get failed for app %d with ret %d", | |
3047 | app->sock, ret); | |
3048 | } else { | |
3049 | DBG3("UST app tp list get failed. Application is dead"); | |
47cb9d4a DG |
3050 | /* |
3051 | * This is normal behavior, an application can die during the | |
3052 | * creation process. Don't report an error so the execution can | |
3053 | * continue normally. Continue normal execution. | |
3054 | */ | |
3055 | break; | |
ffe60014 DG |
3056 | } |
3057 | goto rcu_error; | |
3058 | } | |
3059 | ||
840cb59c | 3060 | health_code_update(); |
815564d8 | 3061 | if (count >= nbmem) { |
d7b3776f | 3062 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3063 | void *ptr; |
3064 | ||
815564d8 MD |
3065 | DBG2("Reallocating event list from %zu to %zu entries", nbmem, |
3066 | 2 * nbmem); | |
3067 | nbmem *= 2; | |
c617c0c6 MD |
3068 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event)); |
3069 | if (ptr == NULL) { | |
5b4a0ec0 | 3070 | PERROR("realloc ust app events"); |
c617c0c6 | 3071 | free(tmp_event); |
5b4a0ec0 DG |
3072 | ret = -ENOMEM; |
3073 | goto rcu_error; | |
3074 | } | |
c617c0c6 | 3075 | tmp_event = ptr; |
5b4a0ec0 | 3076 | } |
c617c0c6 MD |
3077 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3078 | tmp_event[count].loglevel = uiter.loglevel; | |
3079 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3080 | tmp_event[count].pid = app->pid; | |
3081 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3082 | count++; |
421cb601 | 3083 | } |
421cb601 DG |
3084 | } |
3085 | ||
5b4a0ec0 | 3086 | ret = count; |
c617c0c6 | 3087 | *events = tmp_event; |
421cb601 | 3088 | |
5b4a0ec0 | 3089 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3090 | |
5b4a0ec0 DG |
3091 | rcu_error: |
3092 | rcu_read_unlock(); | |
421cb601 | 3093 | error: |
840cb59c | 3094 | health_code_update(); |
5b4a0ec0 | 3095 | return ret; |
421cb601 DG |
3096 | } |
3097 | ||
f37d259d MD |
3098 | /* |
3099 | * Fill events array with all events name of all registered apps. | |
3100 | */ | |
3101 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3102 | { | |
3103 | int ret, handle; | |
3104 | size_t nbmem, count = 0; | |
3105 | struct lttng_ht_iter iter; | |
3106 | struct ust_app *app; | |
c617c0c6 | 3107 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3108 | |
3109 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3110 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3111 | if (tmp_event == NULL) { | |
f37d259d MD |
3112 | PERROR("zmalloc ust app event fields"); |
3113 | ret = -ENOMEM; | |
3114 | goto error; | |
3115 | } | |
3116 | ||
3117 | rcu_read_lock(); | |
3118 | ||
3119 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3120 | struct lttng_ust_field_iter uiter; | |
3121 | ||
840cb59c | 3122 | health_code_update(); |
86acf0da | 3123 | |
f37d259d MD |
3124 | if (!app->compatible) { |
3125 | /* | |
3126 | * TODO: In time, we should notice the caller of this error by | |
3127 | * telling him that this is a version error. | |
3128 | */ | |
3129 | continue; | |
3130 | } | |
3131 | handle = ustctl_tracepoint_field_list(app->sock); | |
3132 | if (handle < 0) { | |
ffe60014 DG |
3133 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3134 | ERR("UST app list field getting handle failed for app pid %d", | |
3135 | app->pid); | |
3136 | } | |
f37d259d MD |
3137 | continue; |
3138 | } | |
3139 | ||
3140 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3141 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3142 | /* Handle ustctl error. */ |
3143 | if (ret < 0) { | |
3144 | free(tmp_event); | |
3145 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3146 | ERR("UST app tp list field failed for app %d with ret %d", | |
3147 | app->sock, ret); | |
3148 | } else { | |
3149 | DBG3("UST app tp list field failed. Application is dead"); | |
47cb9d4a DG |
3150 | /* |
3151 | * This is normal behavior, an application can die during the | |
3152 | * creation process. Don't report an error so the execution can | |
3153 | * continue normally. | |
3154 | */ | |
3155 | break; | |
ffe60014 DG |
3156 | } |
3157 | goto rcu_error; | |
3158 | } | |
3159 | ||
840cb59c | 3160 | health_code_update(); |
f37d259d | 3161 | if (count >= nbmem) { |
d7b3776f | 3162 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3163 | void *ptr; |
3164 | ||
f37d259d MD |
3165 | DBG2("Reallocating event field list from %zu to %zu entries", nbmem, |
3166 | 2 * nbmem); | |
3167 | nbmem *= 2; | |
c617c0c6 MD |
3168 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field)); |
3169 | if (ptr == NULL) { | |
f37d259d | 3170 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3171 | free(tmp_event); |
f37d259d MD |
3172 | ret = -ENOMEM; |
3173 | goto rcu_error; | |
3174 | } | |
c617c0c6 | 3175 | tmp_event = ptr; |
f37d259d | 3176 | } |
f37d259d | 3177 | |
c617c0c6 MD |
3178 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
3179 | tmp_event[count].type = uiter.type; | |
3180 | tmp_event[count].nowrite = uiter.nowrite; | |
f37d259d | 3181 | |
c617c0c6 MD |
3182 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3183 | tmp_event[count].event.loglevel = uiter.loglevel; | |
3184 | tmp_event[count].event.type = LTTNG_UST_TRACEPOINT; | |
3185 | tmp_event[count].event.pid = app->pid; | |
3186 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3187 | count++; |
3188 | } | |
3189 | } | |
3190 | ||
3191 | ret = count; | |
c617c0c6 | 3192 | *fields = tmp_event; |
f37d259d MD |
3193 | |
3194 | DBG2("UST app list event fields done (%zu events)", count); | |
3195 | ||
3196 | rcu_error: | |
3197 | rcu_read_unlock(); | |
3198 | error: | |
840cb59c | 3199 | health_code_update(); |
f37d259d MD |
3200 | return ret; |
3201 | } | |
3202 | ||
5b4a0ec0 DG |
3203 | /* |
3204 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3205 | * |
3206 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3207 | */ |
3208 | void ust_app_clean_list(void) | |
421cb601 | 3209 | { |
5b4a0ec0 | 3210 | int ret; |
659ed79f | 3211 | struct ust_app *app; |
bec39940 | 3212 | struct lttng_ht_iter iter; |
421cb601 | 3213 | |
5b4a0ec0 | 3214 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3215 | |
5b4a0ec0 | 3216 | rcu_read_lock(); |
421cb601 | 3217 | |
659ed79f | 3218 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3219 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3220 | assert(!ret); |
659ed79f | 3221 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3222 | } |
3223 | ||
852d0037 | 3224 | /* Cleanup socket hash table */ |
659ed79f DG |
3225 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3226 | sock_n.node) { | |
852d0037 | 3227 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3228 | assert(!ret); |
3229 | } | |
852d0037 | 3230 | |
d88aee68 DG |
3231 | /* Cleanup notify socket hash table */ |
3232 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3233 | notify_sock_n.node) { | |
3234 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3235 | assert(!ret); | |
3236 | } | |
36b588ed | 3237 | rcu_read_unlock(); |
d88aee68 | 3238 | |
bec39940 | 3239 | /* Destroy is done only when the ht is empty */ |
0b2dc8df MD |
3240 | ht_cleanup_push(ust_app_ht); |
3241 | ht_cleanup_push(ust_app_ht_by_sock); | |
3242 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
5b4a0ec0 DG |
3243 | } |
3244 | ||
3245 | /* | |
3246 | * Init UST app hash table. | |
3247 | */ | |
3248 | void ust_app_ht_alloc(void) | |
3249 | { | |
bec39940 | 3250 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3251 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3252 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3253 | } |
3254 | ||
78f0bacd DG |
3255 | /* |
3256 | * For a specific UST session, disable the channel for all registered apps. | |
3257 | */ | |
35a9059d | 3258 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3259 | struct ltt_ust_channel *uchan) |
3260 | { | |
3261 | int ret = 0; | |
bec39940 DG |
3262 | struct lttng_ht_iter iter; |
3263 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3264 | struct ust_app *app; |
3265 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3266 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3267 | |
3268 | if (usess == NULL || uchan == NULL) { | |
3269 | ERR("Disabling UST global channel with NULL values"); | |
3270 | ret = -1; | |
3271 | goto error; | |
3272 | } | |
3273 | ||
77c5447b | 3274 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3275 | uchan->name, usess->id); |
78f0bacd DG |
3276 | |
3277 | rcu_read_lock(); | |
3278 | ||
3279 | /* For every registered applications */ | |
852d0037 | 3280 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3281 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3282 | if (!app->compatible) { |
3283 | /* | |
3284 | * TODO: In time, we should notice the caller of this error by | |
3285 | * telling him that this is a version error. | |
3286 | */ | |
3287 | continue; | |
3288 | } | |
78f0bacd DG |
3289 | ua_sess = lookup_session_by_app(usess, app); |
3290 | if (ua_sess == NULL) { | |
3291 | continue; | |
3292 | } | |
3293 | ||
8535a6d9 | 3294 | /* Get channel */ |
bec39940 DG |
3295 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3296 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3297 | /* If the session if found for the app, the channel must be there */ |
3298 | assert(ua_chan_node); | |
3299 | ||
3300 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3301 | /* The channel must not be already disabled */ | |
3302 | assert(ua_chan->enabled == 1); | |
3303 | ||
3304 | /* Disable channel onto application */ | |
3305 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3306 | if (ret < 0) { |
3307 | /* XXX: We might want to report this error at some point... */ | |
3308 | continue; | |
3309 | } | |
3310 | } | |
3311 | ||
3312 | rcu_read_unlock(); | |
3313 | ||
3314 | error: | |
3315 | return ret; | |
3316 | } | |
3317 | ||
3318 | /* | |
3319 | * For a specific UST session, enable the channel for all registered apps. | |
3320 | */ | |
35a9059d | 3321 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3322 | struct ltt_ust_channel *uchan) |
3323 | { | |
3324 | int ret = 0; | |
bec39940 | 3325 | struct lttng_ht_iter iter; |
78f0bacd DG |
3326 | struct ust_app *app; |
3327 | struct ust_app_session *ua_sess; | |
3328 | ||
3329 | if (usess == NULL || uchan == NULL) { | |
3330 | ERR("Adding UST global channel to NULL values"); | |
3331 | ret = -1; | |
3332 | goto error; | |
3333 | } | |
3334 | ||
77c5447b | 3335 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3336 | uchan->name, usess->id); |
78f0bacd DG |
3337 | |
3338 | rcu_read_lock(); | |
3339 | ||
3340 | /* For every registered applications */ | |
852d0037 | 3341 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3342 | if (!app->compatible) { |
3343 | /* | |
3344 | * TODO: In time, we should notice the caller of this error by | |
3345 | * telling him that this is a version error. | |
3346 | */ | |
3347 | continue; | |
3348 | } | |
78f0bacd DG |
3349 | ua_sess = lookup_session_by_app(usess, app); |
3350 | if (ua_sess == NULL) { | |
3351 | continue; | |
3352 | } | |
3353 | ||
3354 | /* Enable channel onto application */ | |
3355 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3356 | if (ret < 0) { | |
3357 | /* XXX: We might want to report this error at some point... */ | |
3358 | continue; | |
3359 | } | |
3360 | } | |
3361 | ||
3362 | rcu_read_unlock(); | |
3363 | ||
3364 | error: | |
3365 | return ret; | |
3366 | } | |
3367 | ||
b0a40d28 DG |
3368 | /* |
3369 | * Disable an event in a channel and for a specific session. | |
3370 | */ | |
35a9059d DG |
3371 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3372 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3373 | { |
3374 | int ret = 0; | |
bec39940 DG |
3375 | struct lttng_ht_iter iter, uiter; |
3376 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3377 | struct ust_app *app; |
3378 | struct ust_app_session *ua_sess; | |
3379 | struct ust_app_channel *ua_chan; | |
3380 | struct ust_app_event *ua_event; | |
3381 | ||
3382 | DBG("UST app disabling event %s for all apps in channel " | |
77c5447b MD |
3383 | "%s for session id %" PRIu64, |
3384 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3385 | |
3386 | rcu_read_lock(); | |
3387 | ||
3388 | /* For all registered applications */ | |
852d0037 | 3389 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3390 | if (!app->compatible) { |
3391 | /* | |
3392 | * TODO: In time, we should notice the caller of this error by | |
3393 | * telling him that this is a version error. | |
3394 | */ | |
3395 | continue; | |
3396 | } | |
b0a40d28 DG |
3397 | ua_sess = lookup_session_by_app(usess, app); |
3398 | if (ua_sess == NULL) { | |
3399 | /* Next app */ | |
3400 | continue; | |
3401 | } | |
3402 | ||
3403 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3404 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3405 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3406 | if (ua_chan_node == NULL) { |
77c5447b | 3407 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 3408 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3409 | continue; |
3410 | } | |
3411 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3412 | ||
bec39940 DG |
3413 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3414 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3415 | if (ua_event_node == NULL) { |
3416 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3417 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3418 | continue; |
3419 | } | |
3420 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3421 | ||
7f79d3a1 | 3422 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3423 | if (ret < 0) { |
3424 | /* XXX: Report error someday... */ | |
3425 | continue; | |
3426 | } | |
3427 | } | |
3428 | ||
3429 | rcu_read_unlock(); | |
3430 | ||
3431 | return ret; | |
3432 | } | |
3433 | ||
9730260e | 3434 | /* |
edb67388 | 3435 | * For a specific UST session and UST channel, the event for all |
9730260e DG |
3436 | * registered apps. |
3437 | */ | |
35a9059d | 3438 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
9730260e DG |
3439 | struct ltt_ust_channel *uchan) |
3440 | { | |
3441 | int ret = 0; | |
bec39940 DG |
3442 | struct lttng_ht_iter iter, uiter; |
3443 | struct lttng_ht_node_str *ua_chan_node; | |
9730260e DG |
3444 | struct ust_app *app; |
3445 | struct ust_app_session *ua_sess; | |
3446 | struct ust_app_channel *ua_chan; | |
3447 | struct ust_app_event *ua_event; | |
3448 | ||
3449 | DBG("UST app disabling all event for all apps in channel " | |
77c5447b | 3450 | "%s for session id %" PRIu64, uchan->name, usess->id); |
9730260e DG |
3451 | |
3452 | rcu_read_lock(); | |
3453 | ||
3454 | /* For all registered applications */ | |
852d0037 | 3455 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3456 | if (!app->compatible) { |
3457 | /* | |
3458 | * TODO: In time, we should notice the caller of this error by | |
3459 | * telling him that this is a version error. | |
3460 | */ | |
3461 | continue; | |
3462 | } | |
9730260e | 3463 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3464 | if (!ua_sess) { |
3465 | /* The application has problem or is probably dead. */ | |
3466 | continue; | |
3467 | } | |
9730260e DG |
3468 | |
3469 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3470 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3471 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3472 | /* If the channel is not found, there is a code flow error */ |
3473 | assert(ua_chan_node); | |
3474 | ||
9730260e DG |
3475 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3476 | ||
3477 | /* Disable each events of channel */ | |
bec39940 DG |
3478 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3479 | node.node) { | |
7f79d3a1 | 3480 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
9730260e DG |
3481 | if (ret < 0) { |
3482 | /* XXX: Report error someday... */ | |
3483 | continue; | |
3484 | } | |
3485 | } | |
3486 | } | |
3487 | ||
3488 | rcu_read_unlock(); | |
3489 | ||
3490 | return ret; | |
3491 | } | |
3492 | ||
421cb601 | 3493 | /* |
5b4a0ec0 | 3494 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3495 | */ |
35a9059d | 3496 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3497 | struct ltt_ust_channel *uchan) |
3498 | { | |
3d8ca23b | 3499 | int ret = 0, created; |
bec39940 | 3500 | struct lttng_ht_iter iter; |
48842b30 | 3501 | struct ust_app *app; |
3d8ca23b | 3502 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3503 | |
fc34caaa DG |
3504 | /* Very wrong code flow */ |
3505 | assert(usess); | |
3506 | assert(uchan); | |
421cb601 | 3507 | |
77c5447b | 3508 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 3509 | uchan->name, usess->id); |
48842b30 DG |
3510 | |
3511 | rcu_read_lock(); | |
421cb601 | 3512 | |
5b4a0ec0 | 3513 | /* For every registered applications */ |
852d0037 | 3514 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3515 | if (!app->compatible) { |
3516 | /* | |
3517 | * TODO: In time, we should notice the caller of this error by | |
3518 | * telling him that this is a version error. | |
3519 | */ | |
3520 | continue; | |
3521 | } | |
edb67388 DG |
3522 | /* |
3523 | * Create session on the tracer side and add it to app session HT. Note | |
3524 | * that if session exist, it will simply return a pointer to the ust | |
3525 | * app session. | |
3526 | */ | |
3d8ca23b DG |
3527 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3528 | if (ret < 0) { | |
3529 | switch (ret) { | |
3530 | case -ENOTCONN: | |
3531 | /* | |
3532 | * The application's socket is not valid. Either a bad socket | |
3533 | * or a timeout on it. We can't inform the caller that for a | |
3534 | * specific app, the session failed so lets continue here. | |
3535 | */ | |
3536 | continue; | |
3537 | case -ENOMEM: | |
3538 | default: | |
3539 | goto error_rcu_unlock; | |
3540 | } | |
48842b30 | 3541 | } |
3d8ca23b | 3542 | assert(ua_sess); |
48842b30 | 3543 | |
d0b96690 | 3544 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3545 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3546 | sizeof(uchan->name))) { | |
3547 | struct ustctl_consumer_channel_attr attr; | |
3548 | copy_channel_attr_to_ustctl(&attr, &uchan->attr); | |
3549 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
3550 | &attr); | |
3551 | } else { | |
3552 | /* Create channel onto application. We don't need the chan ref. */ | |
3553 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3554 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3555 | } | |
d0b96690 | 3556 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3557 | if (ret < 0) { |
3558 | if (ret == -ENOMEM) { | |
3559 | /* No more memory is a fatal error. Stop right now. */ | |
3560 | goto error_rcu_unlock; | |
3561 | } | |
3562 | /* Cleanup the created session if it's the case. */ | |
3563 | if (created) { | |
d0b96690 | 3564 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3565 | } |
48842b30 | 3566 | } |
48842b30 | 3567 | } |
5b4a0ec0 | 3568 | |
95e047ff | 3569 | error_rcu_unlock: |
48842b30 | 3570 | rcu_read_unlock(); |
3c14c33f | 3571 | return ret; |
48842b30 DG |
3572 | } |
3573 | ||
5b4a0ec0 | 3574 | /* |
edb67388 | 3575 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3576 | */ |
35a9059d | 3577 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3578 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3579 | { | |
3580 | int ret = 0; | |
bec39940 | 3581 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3582 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3583 | struct ust_app *app; |
3584 | struct ust_app_session *ua_sess; | |
3585 | struct ust_app_channel *ua_chan; | |
3586 | struct ust_app_event *ua_event; | |
48842b30 | 3587 | |
77c5447b | 3588 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 3589 | uevent->attr.name, usess->id); |
48842b30 | 3590 | |
edb67388 DG |
3591 | /* |
3592 | * NOTE: At this point, this function is called only if the session and | |
3593 | * channel passed are already created for all apps. and enabled on the | |
3594 | * tracer also. | |
3595 | */ | |
3596 | ||
48842b30 | 3597 | rcu_read_lock(); |
421cb601 DG |
3598 | |
3599 | /* For all registered applications */ | |
852d0037 | 3600 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3601 | if (!app->compatible) { |
3602 | /* | |
3603 | * TODO: In time, we should notice the caller of this error by | |
3604 | * telling him that this is a version error. | |
3605 | */ | |
3606 | continue; | |
3607 | } | |
edb67388 | 3608 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3609 | if (!ua_sess) { |
3610 | /* The application has problem or is probably dead. */ | |
3611 | continue; | |
3612 | } | |
ba767faf | 3613 | |
d0b96690 DG |
3614 | pthread_mutex_lock(&ua_sess->lock); |
3615 | ||
edb67388 | 3616 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3617 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3618 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3619 | /* If the channel is not found, there is a code flow error */ |
3620 | assert(ua_chan_node); | |
3621 | ||
3622 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3623 | ||
18eace3b DG |
3624 | /* Get event node */ |
3625 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
3626 | uevent->filter, uevent->attr.loglevel); | |
3627 | if (ua_event == NULL) { | |
7f79d3a1 | 3628 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3629 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3630 | goto next_app; |
35a9059d | 3631 | } |
35a9059d DG |
3632 | |
3633 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3634 | if (ret < 0) { | |
d0b96690 | 3635 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3636 | goto error; |
48842b30 | 3637 | } |
d0b96690 DG |
3638 | next_app: |
3639 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3640 | } |
3641 | ||
7f79d3a1 | 3642 | error: |
edb67388 | 3643 | rcu_read_unlock(); |
edb67388 DG |
3644 | return ret; |
3645 | } | |
3646 | ||
3647 | /* | |
3648 | * For a specific existing UST session and UST channel, creates the event for | |
3649 | * all registered apps. | |
3650 | */ | |
35a9059d | 3651 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3652 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3653 | { | |
3654 | int ret = 0; | |
bec39940 DG |
3655 | struct lttng_ht_iter iter, uiter; |
3656 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3657 | struct ust_app *app; |
3658 | struct ust_app_session *ua_sess; | |
3659 | struct ust_app_channel *ua_chan; | |
3660 | ||
77c5447b | 3661 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 3662 | uevent->attr.name, usess->id); |
edb67388 | 3663 | |
edb67388 DG |
3664 | rcu_read_lock(); |
3665 | ||
3666 | /* For all registered applications */ | |
852d0037 | 3667 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3668 | if (!app->compatible) { |
3669 | /* | |
3670 | * TODO: In time, we should notice the caller of this error by | |
3671 | * telling him that this is a version error. | |
3672 | */ | |
3673 | continue; | |
3674 | } | |
edb67388 | 3675 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3676 | if (!ua_sess) { |
3677 | /* The application has problem or is probably dead. */ | |
3678 | continue; | |
3679 | } | |
48842b30 | 3680 | |
d0b96690 | 3681 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3682 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3683 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3684 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3685 | /* If the channel is not found, there is a code flow error */ |
3686 | assert(ua_chan_node); | |
3687 | ||
48842b30 DG |
3688 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3689 | ||
edb67388 | 3690 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3691 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3692 | if (ret < 0) { |
49c336c1 | 3693 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3694 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3695 | break; | |
3696 | } | |
3697 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3698 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3699 | continue; |
48842b30 | 3700 | } |
48842b30 | 3701 | } |
5b4a0ec0 | 3702 | |
48842b30 DG |
3703 | rcu_read_unlock(); |
3704 | ||
3705 | return ret; | |
3706 | } | |
3707 | ||
5b4a0ec0 DG |
3708 | /* |
3709 | * Start tracing for a specific UST session and app. | |
3710 | */ | |
b34cbebf | 3711 | static |
421cb601 | 3712 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3713 | { |
3714 | int ret = 0; | |
48842b30 | 3715 | struct ust_app_session *ua_sess; |
48842b30 | 3716 | |
852d0037 | 3717 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3718 | |
509cbaf8 MD |
3719 | rcu_read_lock(); |
3720 | ||
e0c7ec2b DG |
3721 | if (!app->compatible) { |
3722 | goto end; | |
3723 | } | |
3724 | ||
421cb601 DG |
3725 | ua_sess = lookup_session_by_app(usess, app); |
3726 | if (ua_sess == NULL) { | |
d42f20df DG |
3727 | /* The session is in teardown process. Ignore and continue. */ |
3728 | goto end; | |
421cb601 | 3729 | } |
48842b30 | 3730 | |
d0b96690 DG |
3731 | pthread_mutex_lock(&ua_sess->lock); |
3732 | ||
aea829b3 DG |
3733 | /* Upon restart, we skip the setup, already done */ |
3734 | if (ua_sess->started) { | |
8be98f9a | 3735 | goto skip_setup; |
aea829b3 | 3736 | } |
8be98f9a | 3737 | |
a4b92340 DG |
3738 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3739 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3740 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3741 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3742 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3743 | if (ret < 0) { |
3744 | if (ret != -EEXIST) { | |
3745 | ERR("Trace directory creation error"); | |
d0b96690 | 3746 | goto error_unlock; |
421cb601 | 3747 | } |
173af62f | 3748 | } |
7753dea8 | 3749 | } |
aea829b3 | 3750 | |
d65d2de8 DG |
3751 | /* |
3752 | * Create the metadata for the application. This returns gracefully if a | |
3753 | * metadata was already set for the session. | |
3754 | */ | |
3755 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, NULL); | |
421cb601 | 3756 | if (ret < 0) { |
d0b96690 | 3757 | goto error_unlock; |
421cb601 | 3758 | } |
48842b30 | 3759 | |
840cb59c | 3760 | health_code_update(); |
86acf0da | 3761 | |
8be98f9a | 3762 | skip_setup: |
421cb601 | 3763 | /* This start the UST tracing */ |
852d0037 | 3764 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3765 | if (ret < 0) { |
ffe60014 DG |
3766 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3767 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3768 | app->pid, ret); | |
3769 | } else { | |
3770 | DBG("UST app start session failed. Application is dead."); | |
47cb9d4a DG |
3771 | /* |
3772 | * This is normal behavior, an application can die during the | |
3773 | * creation process. Don't report an error so the execution can | |
3774 | * continue normally. | |
3775 | */ | |
3776 | pthread_mutex_unlock(&ua_sess->lock); | |
3777 | goto end; | |
ffe60014 | 3778 | } |
d0b96690 | 3779 | goto error_unlock; |
421cb601 | 3780 | } |
5b4a0ec0 | 3781 | |
55c3953d DG |
3782 | /* Indicate that the session has been started once */ |
3783 | ua_sess->started = 1; | |
3784 | ||
d0b96690 DG |
3785 | pthread_mutex_unlock(&ua_sess->lock); |
3786 | ||
840cb59c | 3787 | health_code_update(); |
86acf0da | 3788 | |
421cb601 | 3789 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3790 | ret = ustctl_wait_quiescent(app->sock); |
3791 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3792 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3793 | app->pid, ret); | |
3794 | } | |
48842b30 | 3795 | |
e0c7ec2b DG |
3796 | end: |
3797 | rcu_read_unlock(); | |
840cb59c | 3798 | health_code_update(); |
421cb601 | 3799 | return 0; |
48842b30 | 3800 | |
d0b96690 DG |
3801 | error_unlock: |
3802 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3803 | rcu_read_unlock(); |
840cb59c | 3804 | health_code_update(); |
421cb601 DG |
3805 | return -1; |
3806 | } | |
48842b30 | 3807 | |
8be98f9a MD |
3808 | /* |
3809 | * Stop tracing for a specific UST session and app. | |
3810 | */ | |
b34cbebf | 3811 | static |
8be98f9a MD |
3812 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3813 | { | |
3814 | int ret = 0; | |
3815 | struct ust_app_session *ua_sess; | |
7972aab2 | 3816 | struct ust_registry_session *registry; |
8be98f9a | 3817 | |
852d0037 | 3818 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3819 | |
3820 | rcu_read_lock(); | |
3821 | ||
e0c7ec2b | 3822 | if (!app->compatible) { |
d88aee68 | 3823 | goto end_no_session; |
e0c7ec2b DG |
3824 | } |
3825 | ||
8be98f9a MD |
3826 | ua_sess = lookup_session_by_app(usess, app); |
3827 | if (ua_sess == NULL) { | |
d88aee68 | 3828 | goto end_no_session; |
8be98f9a MD |
3829 | } |
3830 | ||
d88aee68 DG |
3831 | pthread_mutex_lock(&ua_sess->lock); |
3832 | ||
9bc07046 DG |
3833 | /* |
3834 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3835 | * that was never started. It's possible since we can have a fail start |
3836 | * from either the application manager thread or the command thread. Simply | |
3837 | * indicate that this is a stop error. | |
9bc07046 | 3838 | */ |
f9dfc3d9 | 3839 | if (!ua_sess->started) { |
c45536e1 DG |
3840 | goto error_rcu_unlock; |
3841 | } | |
7db205b5 | 3842 | |
840cb59c | 3843 | health_code_update(); |
86acf0da | 3844 | |
9d6c7d3f | 3845 | /* This inhibits UST tracing */ |
852d0037 | 3846 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3847 | if (ret < 0) { |
ffe60014 DG |
3848 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3849 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3850 | app->pid, ret); | |
3851 | } else { | |
3852 | DBG("UST app stop session failed. Application is dead."); | |
47cb9d4a DG |
3853 | /* |
3854 | * This is normal behavior, an application can die during the | |
3855 | * creation process. Don't report an error so the execution can | |
3856 | * continue normally. | |
3857 | */ | |
3858 | goto end_unlock; | |
ffe60014 | 3859 | } |
9d6c7d3f DG |
3860 | goto error_rcu_unlock; |
3861 | } | |
3862 | ||
840cb59c | 3863 | health_code_update(); |
86acf0da | 3864 | |
9d6c7d3f | 3865 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3866 | ret = ustctl_wait_quiescent(app->sock); |
3867 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3868 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3869 | app->pid, ret); | |
3870 | } | |
9d6c7d3f | 3871 | |
840cb59c | 3872 | health_code_update(); |
86acf0da | 3873 | |
b34cbebf MD |
3874 | registry = get_session_registry(ua_sess); |
3875 | assert(registry); | |
1b532a60 DG |
3876 | |
3877 | if (!registry->metadata_closed) { | |
3878 | /* Push metadata for application before freeing the application. */ | |
3879 | (void) push_metadata(registry, ua_sess->consumer); | |
3880 | } | |
b34cbebf | 3881 | |
47cb9d4a | 3882 | end_unlock: |
b34cbebf MD |
3883 | pthread_mutex_unlock(&ua_sess->lock); |
3884 | end_no_session: | |
3885 | rcu_read_unlock(); | |
3886 | health_code_update(); | |
3887 | return 0; | |
3888 | ||
3889 | error_rcu_unlock: | |
3890 | pthread_mutex_unlock(&ua_sess->lock); | |
3891 | rcu_read_unlock(); | |
3892 | health_code_update(); | |
3893 | return -1; | |
3894 | } | |
3895 | ||
3896 | /* | |
3897 | * Flush buffers for a specific UST session and app. | |
3898 | */ | |
3899 | static | |
3900 | int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
3901 | { | |
3902 | int ret = 0; | |
3903 | struct lttng_ht_iter iter; | |
3904 | struct ust_app_session *ua_sess; | |
3905 | struct ust_app_channel *ua_chan; | |
3906 | ||
3907 | DBG("Flushing buffers for ust app pid %d", app->pid); | |
3908 | ||
3909 | rcu_read_lock(); | |
3910 | ||
3911 | if (!app->compatible) { | |
3912 | goto end_no_session; | |
3913 | } | |
3914 | ||
3915 | ua_sess = lookup_session_by_app(usess, app); | |
3916 | if (ua_sess == NULL) { | |
3917 | goto end_no_session; | |
3918 | } | |
3919 | ||
3920 | pthread_mutex_lock(&ua_sess->lock); | |
3921 | ||
3922 | health_code_update(); | |
3923 | ||
9d6c7d3f | 3924 | /* Flushing buffers */ |
bec39940 DG |
3925 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
3926 | node.node) { | |
840cb59c | 3927 | health_code_update(); |
ffe60014 | 3928 | assert(ua_chan->is_sent); |
852d0037 | 3929 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 3930 | if (ret < 0) { |
ffe60014 DG |
3931 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3932 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
3933 | app->pid, ua_chan->name, ret); | |
3934 | } else { | |
3935 | DBG3("UST app failed to flush %s. Application is dead.", | |
3936 | ua_chan->name); | |
47cb9d4a DG |
3937 | /* |
3938 | * This is normal behavior, an application can die during the | |
3939 | * creation process. Don't report an error so the execution can | |
3940 | * continue normally. | |
3941 | */ | |
ffe60014 | 3942 | } |
6d3686da DG |
3943 | /* Continuing flushing all buffers */ |
3944 | continue; | |
8be98f9a MD |
3945 | } |
3946 | } | |
8be98f9a | 3947 | |
840cb59c | 3948 | health_code_update(); |
86acf0da | 3949 | |
d88aee68 DG |
3950 | pthread_mutex_unlock(&ua_sess->lock); |
3951 | end_no_session: | |
7db205b5 | 3952 | rcu_read_unlock(); |
840cb59c | 3953 | health_code_update(); |
8be98f9a | 3954 | return 0; |
8be98f9a MD |
3955 | } |
3956 | ||
84cd17c6 MD |
3957 | /* |
3958 | * Destroy a specific UST session in apps. | |
3959 | */ | |
3353de95 | 3960 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 3961 | { |
ffe60014 | 3962 | int ret; |
84cd17c6 | 3963 | struct ust_app_session *ua_sess; |
bec39940 | 3964 | struct lttng_ht_iter iter; |
77c5447b | 3965 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 3966 | |
852d0037 | 3967 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
3968 | |
3969 | rcu_read_lock(); | |
3970 | ||
e0c7ec2b DG |
3971 | if (!app->compatible) { |
3972 | goto end; | |
3973 | } | |
3974 | ||
84cd17c6 | 3975 | __lookup_session_by_app(usess, app, &iter); |
77c5447b | 3976 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 3977 | if (node == NULL) { |
d42f20df DG |
3978 | /* Session is being or is deleted. */ |
3979 | goto end; | |
84cd17c6 MD |
3980 | } |
3981 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 3982 | |
840cb59c | 3983 | health_code_update(); |
d0b96690 | 3984 | destroy_app_session(app, ua_sess); |
84cd17c6 | 3985 | |
840cb59c | 3986 | health_code_update(); |
7db205b5 | 3987 | |
84cd17c6 | 3988 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3989 | ret = ustctl_wait_quiescent(app->sock); |
3990 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3991 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3992 | app->pid, ret); | |
3993 | } | |
e0c7ec2b DG |
3994 | end: |
3995 | rcu_read_unlock(); | |
840cb59c | 3996 | health_code_update(); |
84cd17c6 | 3997 | return 0; |
84cd17c6 MD |
3998 | } |
3999 | ||
5b4a0ec0 DG |
4000 | /* |
4001 | * Start tracing for the UST session. | |
4002 | */ | |
421cb601 DG |
4003 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4004 | { | |
4005 | int ret = 0; | |
bec39940 | 4006 | struct lttng_ht_iter iter; |
421cb601 | 4007 | struct ust_app *app; |
48842b30 | 4008 | |
421cb601 DG |
4009 | DBG("Starting all UST traces"); |
4010 | ||
4011 | rcu_read_lock(); | |
421cb601 | 4012 | |
852d0037 | 4013 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4014 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4015 | if (ret < 0) { |
5b4a0ec0 DG |
4016 | /* Continue to next apps even on error */ |
4017 | continue; | |
48842b30 | 4018 | } |
48842b30 | 4019 | } |
5b4a0ec0 | 4020 | |
48842b30 DG |
4021 | rcu_read_unlock(); |
4022 | ||
4023 | return 0; | |
4024 | } | |
487cf67c | 4025 | |
8be98f9a MD |
4026 | /* |
4027 | * Start tracing for the UST session. | |
4028 | */ | |
4029 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4030 | { | |
4031 | int ret = 0; | |
bec39940 | 4032 | struct lttng_ht_iter iter; |
8be98f9a MD |
4033 | struct ust_app *app; |
4034 | ||
4035 | DBG("Stopping all UST traces"); | |
4036 | ||
4037 | rcu_read_lock(); | |
4038 | ||
b34cbebf MD |
4039 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4040 | ret = ust_app_stop_trace(usess, app); | |
4041 | if (ret < 0) { | |
4042 | /* Continue to next apps even on error */ | |
4043 | continue; | |
4044 | } | |
4045 | } | |
4046 | ||
5e674ece | 4047 | /* Flush buffers and push metadata (for UID buffers). */ |
b34cbebf MD |
4048 | switch (usess->buffer_type) { |
4049 | case LTTNG_BUFFER_PER_UID: | |
4050 | { | |
7972aab2 | 4051 | struct buffer_reg_uid *reg; |
b34cbebf MD |
4052 | |
4053 | /* Flush all per UID buffers associated to that session. */ | |
7972aab2 | 4054 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5e674ece | 4055 | struct ust_registry_session *ust_session_reg; |
7972aab2 DG |
4056 | struct buffer_reg_channel *reg_chan; |
4057 | struct consumer_socket *socket; | |
4058 | ||
4059 | /* Get consumer socket to use to push the metadata.*/ | |
4060 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4061 | usess->consumer); | |
4062 | if (!socket) { | |
4063 | /* Ignore request if no consumer is found for the session. */ | |
4064 | continue; | |
4065 | } | |
4066 | ||
4067 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4068 | reg_chan, node.node) { | |
4069 | /* | |
4070 | * The following call will print error values so the return | |
4071 | * code is of little importance because whatever happens, we | |
4072 | * have to try them all. | |
4073 | */ | |
4074 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4075 | } | |
5e674ece MD |
4076 | |
4077 | ust_session_reg = reg->registry->reg.ust; | |
4078 | if (!ust_session_reg->metadata_closed) { | |
4079 | /* Push metadata. */ | |
4080 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4081 | } | |
7972aab2 | 4082 | } |
5e674ece | 4083 | |
b34cbebf | 4084 | break; |
7972aab2 | 4085 | } |
b34cbebf MD |
4086 | case LTTNG_BUFFER_PER_PID: |
4087 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4088 | ret = ust_app_flush_trace(usess, app); | |
4089 | if (ret < 0) { | |
4090 | /* Continue to next apps even on error */ | |
4091 | continue; | |
4092 | } | |
8be98f9a | 4093 | } |
b34cbebf MD |
4094 | break; |
4095 | default: | |
4096 | assert(0); | |
4097 | break; | |
8be98f9a MD |
4098 | } |
4099 | ||
4100 | rcu_read_unlock(); | |
4101 | ||
4102 | return 0; | |
4103 | } | |
4104 | ||
84cd17c6 MD |
4105 | /* |
4106 | * Destroy app UST session. | |
4107 | */ | |
4108 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4109 | { | |
4110 | int ret = 0; | |
bec39940 | 4111 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4112 | struct ust_app *app; |
4113 | ||
4114 | DBG("Destroy all UST traces"); | |
4115 | ||
4116 | rcu_read_lock(); | |
4117 | ||
852d0037 | 4118 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4119 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4120 | if (ret < 0) { |
4121 | /* Continue to next apps even on error */ | |
4122 | continue; | |
4123 | } | |
4124 | } | |
4125 | ||
4126 | rcu_read_unlock(); | |
4127 | ||
4128 | return 0; | |
4129 | } | |
4130 | ||
5b4a0ec0 DG |
4131 | /* |
4132 | * Add channels/events from UST global domain to registered apps at sock. | |
4133 | */ | |
487cf67c DG |
4134 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4135 | { | |
55c54cce | 4136 | int ret = 0; |
4623416f | 4137 | struct lttng_ht_iter iter, uiter; |
487cf67c | 4138 | struct ust_app *app; |
3d8ca23b | 4139 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4140 | struct ust_app_channel *ua_chan; |
4141 | struct ust_app_event *ua_event; | |
727d5404 | 4142 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4143 | |
95e047ff | 4144 | assert(usess); |
ffe60014 | 4145 | assert(sock >= 0); |
1f3580c7 | 4146 | |
77c5447b | 4147 | DBG2("UST app global update for app sock %d for session id %" PRIu64, sock, |
a991f516 | 4148 | usess->id); |
487cf67c | 4149 | |
284d8f55 DG |
4150 | rcu_read_lock(); |
4151 | ||
487cf67c DG |
4152 | app = find_app_by_sock(sock); |
4153 | if (app == NULL) { | |
d88aee68 DG |
4154 | /* |
4155 | * Application can be unregistered before so this is possible hence | |
4156 | * simply stopping the update. | |
4157 | */ | |
4158 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4159 | goto error; |
4160 | } | |
4161 | ||
e0c7ec2b DG |
4162 | if (!app->compatible) { |
4163 | goto error; | |
4164 | } | |
4165 | ||
3d8ca23b DG |
4166 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4167 | if (ret < 0) { | |
4168 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4169 | goto error; |
4170 | } | |
3d8ca23b | 4171 | assert(ua_sess); |
487cf67c | 4172 | |
d0b96690 DG |
4173 | pthread_mutex_lock(&ua_sess->lock); |
4174 | ||
284d8f55 | 4175 | /* |
d0b96690 | 4176 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4177 | * app session above made a shadow copy of the UST global domain from the |
4178 | * ltt ust session. | |
4179 | */ | |
bec39940 DG |
4180 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4181 | node.node) { | |
d65d2de8 DG |
4182 | /* |
4183 | * For a metadata channel, handle it differently. | |
4184 | */ | |
4185 | if (!strncmp(ua_chan->name, DEFAULT_METADATA_NAME, | |
4186 | sizeof(ua_chan->name))) { | |
4187 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
4188 | &ua_chan->attr); | |
c7a339aa DG |
4189 | if (ret < 0) { |
4190 | goto error_unlock; | |
4191 | } | |
d65d2de8 DG |
4192 | /* Remove it from the hash table and continue!. */ |
4193 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
4194 | assert(!ret); | |
4195 | delete_ust_app_channel(-1, ua_chan, app); | |
4196 | continue; | |
4197 | } else { | |
4198 | ret = do_create_channel(app, usess, ua_sess, ua_chan); | |
c7a339aa DG |
4199 | if (ret < 0) { |
4200 | /* | |
4201 | * Stop everything. On error, the application failed, no more | |
4202 | * file descriptor are available or ENOMEM so stopping here is | |
4203 | * the only thing we can do for now. | |
4204 | */ | |
4205 | goto error_unlock; | |
4206 | } | |
487cf67c DG |
4207 | } |
4208 | ||
4623416f DG |
4209 | /* |
4210 | * Add context using the list so they are enabled in the same order the | |
4211 | * user added them. | |
4212 | */ | |
4213 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4214 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4215 | if (ret < 0) { | |
d0b96690 | 4216 | goto error_unlock; |
727d5404 DG |
4217 | } |
4218 | } | |
4219 | ||
4220 | ||
284d8f55 | 4221 | /* For each events */ |
bec39940 DG |
4222 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4223 | node.node) { | |
284d8f55 DG |
4224 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4225 | if (ret < 0) { | |
d0b96690 | 4226 | goto error_unlock; |
487cf67c | 4227 | } |
36dc12cc | 4228 | } |
487cf67c DG |
4229 | } |
4230 | ||
d0b96690 DG |
4231 | pthread_mutex_unlock(&ua_sess->lock); |
4232 | ||
36dc12cc | 4233 | if (usess->start_trace) { |
421cb601 | 4234 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4235 | if (ret < 0) { |
36dc12cc DG |
4236 | goto error; |
4237 | } | |
4238 | ||
852d0037 | 4239 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4240 | } |
4241 | ||
ffe60014 DG |
4242 | /* Everything went well at this point. */ |
4243 | rcu_read_unlock(); | |
4244 | return; | |
4245 | ||
d0b96690 DG |
4246 | error_unlock: |
4247 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4248 | error: |
ffe60014 | 4249 | if (ua_sess) { |
d0b96690 | 4250 | destroy_app_session(app, ua_sess); |
ffe60014 | 4251 | } |
487cf67c DG |
4252 | rcu_read_unlock(); |
4253 | return; | |
4254 | } | |
55cc08a6 DG |
4255 | |
4256 | /* | |
4257 | * Add context to a specific channel for global UST domain. | |
4258 | */ | |
4259 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4260 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4261 | { | |
4262 | int ret = 0; | |
bec39940 DG |
4263 | struct lttng_ht_node_str *ua_chan_node; |
4264 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4265 | struct ust_app_channel *ua_chan = NULL; |
4266 | struct ust_app_session *ua_sess; | |
4267 | struct ust_app *app; | |
4268 | ||
4269 | rcu_read_lock(); | |
4270 | ||
852d0037 | 4271 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4272 | if (!app->compatible) { |
4273 | /* | |
4274 | * TODO: In time, we should notice the caller of this error by | |
4275 | * telling him that this is a version error. | |
4276 | */ | |
4277 | continue; | |
4278 | } | |
55cc08a6 DG |
4279 | ua_sess = lookup_session_by_app(usess, app); |
4280 | if (ua_sess == NULL) { | |
4281 | continue; | |
4282 | } | |
4283 | ||
d0b96690 | 4284 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4285 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4286 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4287 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4288 | if (ua_chan_node == NULL) { |
d0b96690 | 4289 | goto next_app; |
55cc08a6 DG |
4290 | } |
4291 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4292 | node); | |
55cc08a6 DG |
4293 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4294 | if (ret < 0) { | |
d0b96690 | 4295 | goto next_app; |
55cc08a6 | 4296 | } |
d0b96690 DG |
4297 | next_app: |
4298 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4299 | } |
4300 | ||
55cc08a6 DG |
4301 | rcu_read_unlock(); |
4302 | return ret; | |
4303 | } | |
4304 | ||
76d45b40 DG |
4305 | /* |
4306 | * Enable event for a channel from a UST session for a specific PID. | |
4307 | */ | |
4308 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4309 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4310 | { | |
4311 | int ret = 0; | |
bec39940 | 4312 | struct lttng_ht_iter iter; |
18eace3b | 4313 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4314 | struct ust_app *app; |
4315 | struct ust_app_session *ua_sess; | |
4316 | struct ust_app_channel *ua_chan; | |
4317 | struct ust_app_event *ua_event; | |
4318 | ||
4319 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4320 | ||
4321 | rcu_read_lock(); | |
4322 | ||
4323 | app = ust_app_find_by_pid(pid); | |
4324 | if (app == NULL) { | |
4325 | ERR("UST app enable event per PID %d not found", pid); | |
4326 | ret = -1; | |
d0b96690 | 4327 | goto end; |
76d45b40 DG |
4328 | } |
4329 | ||
e0c7ec2b DG |
4330 | if (!app->compatible) { |
4331 | ret = 0; | |
d0b96690 | 4332 | goto end; |
e0c7ec2b DG |
4333 | } |
4334 | ||
76d45b40 | 4335 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4336 | if (!ua_sess) { |
4337 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4338 | ret = 0; |
4339 | goto end; | |
c4a1715b | 4340 | } |
76d45b40 | 4341 | |
d0b96690 | 4342 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4343 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4344 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4345 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4346 | /* If the channel is not found, there is a code flow error */ |
4347 | assert(ua_chan_node); | |
4348 | ||
4349 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4350 | ||
18eace3b DG |
4351 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4352 | uevent->filter, uevent->attr.loglevel); | |
4353 | if (ua_event == NULL) { | |
76d45b40 DG |
4354 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4355 | if (ret < 0) { | |
d0b96690 | 4356 | goto end_unlock; |
76d45b40 DG |
4357 | } |
4358 | } else { | |
76d45b40 DG |
4359 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4360 | if (ret < 0) { | |
d0b96690 | 4361 | goto end_unlock; |
76d45b40 DG |
4362 | } |
4363 | } | |
4364 | ||
d0b96690 DG |
4365 | end_unlock: |
4366 | pthread_mutex_unlock(&ua_sess->lock); | |
4367 | end: | |
76d45b40 DG |
4368 | rcu_read_unlock(); |
4369 | return ret; | |
4370 | } | |
7f79d3a1 DG |
4371 | |
4372 | /* | |
4373 | * Disable event for a channel from a UST session for a specific PID. | |
4374 | */ | |
4375 | int ust_app_disable_event_pid(struct ltt_ust_session *usess, | |
4376 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4377 | { | |
4378 | int ret = 0; | |
bec39940 DG |
4379 | struct lttng_ht_iter iter; |
4380 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
7f79d3a1 DG |
4381 | struct ust_app *app; |
4382 | struct ust_app_session *ua_sess; | |
4383 | struct ust_app_channel *ua_chan; | |
4384 | struct ust_app_event *ua_event; | |
4385 | ||
4386 | DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); | |
4387 | ||
4388 | rcu_read_lock(); | |
4389 | ||
4390 | app = ust_app_find_by_pid(pid); | |
4391 | if (app == NULL) { | |
4392 | ERR("UST app disable event per PID %d not found", pid); | |
4393 | ret = -1; | |
4394 | goto error; | |
4395 | } | |
4396 | ||
e0c7ec2b DG |
4397 | if (!app->compatible) { |
4398 | ret = 0; | |
4399 | goto error; | |
4400 | } | |
4401 | ||
7f79d3a1 | 4402 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4403 | if (!ua_sess) { |
4404 | /* The application has problem or is probably dead. */ | |
4405 | goto error; | |
4406 | } | |
7f79d3a1 DG |
4407 | |
4408 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4409 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4410 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4411 | if (ua_chan_node == NULL) { |
4412 | /* Channel does not exist, skip disabling */ | |
4413 | goto error; | |
4414 | } | |
4415 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4416 | ||
bec39940 DG |
4417 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); |
4418 | ua_event_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4419 | if (ua_event_node == NULL) { |
4420 | /* Event does not exist, skip disabling */ | |
4421 | goto error; | |
4422 | } | |
4423 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
4424 | ||
4425 | ret = disable_ust_app_event(ua_sess, ua_event, app); | |
4426 | if (ret < 0) { | |
4427 | goto error; | |
4428 | } | |
4429 | ||
4430 | error: | |
4431 | rcu_read_unlock(); | |
4432 | return ret; | |
4433 | } | |
e0c7ec2b | 4434 | |
4466912f DG |
4435 | /* |
4436 | * Calibrate registered applications. | |
4437 | */ | |
4438 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4439 | { | |
4440 | int ret = 0; | |
4441 | struct lttng_ht_iter iter; | |
4442 | struct ust_app *app; | |
4443 | ||
4444 | rcu_read_lock(); | |
4445 | ||
852d0037 | 4446 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4447 | if (!app->compatible) { |
4448 | /* | |
4449 | * TODO: In time, we should notice the caller of this error by | |
4450 | * telling him that this is a version error. | |
4451 | */ | |
4452 | continue; | |
4453 | } | |
4454 | ||
840cb59c | 4455 | health_code_update(); |
86acf0da | 4456 | |
852d0037 | 4457 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4458 | if (ret < 0) { |
4459 | switch (ret) { | |
4460 | case -ENOSYS: | |
4461 | /* Means that it's not implemented on the tracer side. */ | |
4462 | ret = 0; | |
4463 | break; | |
4464 | default: | |
4466912f | 4465 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4466 | app->pid, ret); |
4466912f DG |
4467 | break; |
4468 | } | |
4469 | } | |
4470 | } | |
4471 | ||
4472 | DBG("UST app global domain calibration finished"); | |
4473 | ||
4474 | rcu_read_unlock(); | |
4475 | ||
840cb59c | 4476 | health_code_update(); |
86acf0da | 4477 | |
4466912f DG |
4478 | return ret; |
4479 | } | |
d0b96690 DG |
4480 | |
4481 | /* | |
4482 | * Receive registration and populate the given msg structure. | |
4483 | * | |
4484 | * On success return 0 else a negative value returned by the ustctl call. | |
4485 | */ | |
4486 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4487 | { | |
4488 | int ret; | |
4489 | uint32_t pid, ppid, uid, gid; | |
4490 | ||
4491 | assert(msg); | |
4492 | ||
4493 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4494 | &pid, &ppid, &uid, &gid, | |
4495 | &msg->bits_per_long, | |
4496 | &msg->uint8_t_alignment, | |
4497 | &msg->uint16_t_alignment, | |
4498 | &msg->uint32_t_alignment, | |
4499 | &msg->uint64_t_alignment, | |
4500 | &msg->long_alignment, | |
4501 | &msg->byte_order, | |
4502 | msg->name); | |
4503 | if (ret < 0) { | |
4504 | switch (-ret) { | |
4505 | case EPIPE: | |
4506 | case ECONNRESET: | |
4507 | case LTTNG_UST_ERR_EXITING: | |
4508 | DBG3("UST app recv reg message failed. Application died"); | |
4509 | break; | |
4510 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4511 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4512 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4513 | LTTNG_UST_ABI_MINOR_VERSION); | |
4514 | break; | |
4515 | default: | |
4516 | ERR("UST app recv reg message failed with ret %d", ret); | |
4517 | break; | |
4518 | } | |
4519 | goto error; | |
4520 | } | |
4521 | msg->pid = (pid_t) pid; | |
4522 | msg->ppid = (pid_t) ppid; | |
4523 | msg->uid = (uid_t) uid; | |
4524 | msg->gid = (gid_t) gid; | |
4525 | ||
4526 | error: | |
4527 | return ret; | |
4528 | } | |
4529 | ||
d88aee68 DG |
4530 | /* |
4531 | * Return a ust app channel object using the application object and the channel | |
4532 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4533 | * lock MUST be acquired before calling this function. | |
4534 | */ | |
d0b96690 DG |
4535 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4536 | int objd) | |
4537 | { | |
4538 | struct lttng_ht_node_ulong *node; | |
4539 | struct lttng_ht_iter iter; | |
4540 | struct ust_app_channel *ua_chan = NULL; | |
4541 | ||
4542 | assert(app); | |
4543 | ||
4544 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4545 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4546 | if (node == NULL) { | |
4547 | DBG2("UST app channel find by objd %d not found", objd); | |
4548 | goto error; | |
4549 | } | |
4550 | ||
4551 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4552 | ||
4553 | error: | |
4554 | return ua_chan; | |
4555 | } | |
4556 | ||
d88aee68 DG |
4557 | /* |
4558 | * Reply to a register channel notification from an application on the notify | |
4559 | * socket. The channel metadata is also created. | |
4560 | * | |
4561 | * The session UST registry lock is acquired in this function. | |
4562 | * | |
4563 | * On success 0 is returned else a negative value. | |
4564 | */ | |
d0b96690 DG |
4565 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4566 | size_t nr_fields, struct ustctl_field *fields) | |
4567 | { | |
4568 | int ret, ret_code = 0; | |
4569 | uint32_t chan_id, reg_count; | |
7972aab2 | 4570 | uint64_t chan_reg_key; |
d0b96690 DG |
4571 | enum ustctl_channel_header type; |
4572 | struct ust_app *app; | |
4573 | struct ust_app_channel *ua_chan; | |
4574 | struct ust_app_session *ua_sess; | |
7972aab2 | 4575 | struct ust_registry_session *registry; |
45893984 | 4576 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4577 | |
4578 | rcu_read_lock(); | |
4579 | ||
4580 | /* Lookup application. If not found, there is a code flow error. */ | |
4581 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4582 | if (!app) { |
4583 | DBG("Application socket %d is being teardown. Abort event notify", | |
4584 | sock); | |
4585 | ret = 0; | |
d5d629b5 | 4586 | free(fields); |
d88aee68 DG |
4587 | goto error_rcu_unlock; |
4588 | } | |
d0b96690 | 4589 | |
4950b860 | 4590 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4591 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4592 | if (!ua_chan) { |
4593 | DBG("Application channel is being teardown. Abort event notify"); | |
4594 | ret = 0; | |
d5d629b5 | 4595 | free(fields); |
4950b860 MD |
4596 | goto error_rcu_unlock; |
4597 | } | |
4598 | ||
d0b96690 DG |
4599 | assert(ua_chan->session); |
4600 | ua_sess = ua_chan->session; | |
d0b96690 | 4601 | |
7972aab2 DG |
4602 | /* Get right session registry depending on the session buffer type. */ |
4603 | registry = get_session_registry(ua_sess); | |
4604 | assert(registry); | |
45893984 | 4605 | |
7972aab2 DG |
4606 | /* Depending on the buffer type, a different channel key is used. */ |
4607 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4608 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4609 | } else { |
7972aab2 | 4610 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4611 | } |
4612 | ||
7972aab2 DG |
4613 | pthread_mutex_lock(®istry->lock); |
4614 | ||
4615 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4616 | assert(chan_reg); | |
4617 | ||
4618 | if (!chan_reg->register_done) { | |
4619 | reg_count = ust_registry_get_event_count(chan_reg); | |
4620 | if (reg_count < 31) { | |
4621 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4622 | } else { | |
4623 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4624 | } | |
4625 | ||
4626 | chan_reg->nr_ctx_fields = nr_fields; | |
4627 | chan_reg->ctx_fields = fields; | |
4628 | chan_reg->header_type = type; | |
d0b96690 | 4629 | } else { |
7972aab2 DG |
4630 | /* Get current already assigned values. */ |
4631 | type = chan_reg->header_type; | |
d5d629b5 DG |
4632 | free(fields); |
4633 | /* Set to NULL so the error path does not do a double free. */ | |
4634 | fields = NULL; | |
d0b96690 | 4635 | } |
7972aab2 DG |
4636 | /* Channel id is set during the object creation. */ |
4637 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4638 | |
4639 | /* Append to metadata */ | |
7972aab2 DG |
4640 | if (!chan_reg->metadata_dumped) { |
4641 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4642 | if (ret_code) { |
4643 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4644 | goto reply; | |
4645 | } | |
4646 | } | |
4647 | ||
4648 | reply: | |
7972aab2 DG |
4649 | DBG3("UST app replying to register channel key %" PRIu64 |
4650 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4651 | ret_code); | |
d0b96690 DG |
4652 | |
4653 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4654 | if (ret < 0) { | |
4655 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4656 | ERR("UST app reply channel failed with ret %d", ret); | |
4657 | } else { | |
4658 | DBG3("UST app reply channel failed. Application died"); | |
4659 | } | |
4660 | goto error; | |
4661 | } | |
4662 | ||
7972aab2 DG |
4663 | /* This channel registry registration is completed. */ |
4664 | chan_reg->register_done = 1; | |
4665 | ||
d0b96690 | 4666 | error: |
7972aab2 | 4667 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4668 | error_rcu_unlock: |
d0b96690 | 4669 | rcu_read_unlock(); |
d5d629b5 DG |
4670 | if (ret) { |
4671 | free(fields); | |
4672 | } | |
d0b96690 DG |
4673 | return ret; |
4674 | } | |
4675 | ||
d88aee68 DG |
4676 | /* |
4677 | * Add event to the UST channel registry. When the event is added to the | |
4678 | * registry, the metadata is also created. Once done, this replies to the | |
4679 | * application with the appropriate error code. | |
4680 | * | |
4681 | * The session UST registry lock is acquired in the function. | |
4682 | * | |
4683 | * On success 0 is returned else a negative value. | |
4684 | */ | |
d0b96690 DG |
4685 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4686 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4687 | char *model_emf_uri) | |
4688 | { | |
4689 | int ret, ret_code; | |
4690 | uint32_t event_id = 0; | |
7972aab2 | 4691 | uint64_t chan_reg_key; |
d0b96690 DG |
4692 | struct ust_app *app; |
4693 | struct ust_app_channel *ua_chan; | |
4694 | struct ust_app_session *ua_sess; | |
7972aab2 | 4695 | struct ust_registry_session *registry; |
d0b96690 DG |
4696 | |
4697 | rcu_read_lock(); | |
4698 | ||
4699 | /* Lookup application. If not found, there is a code flow error. */ | |
4700 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4701 | if (!app) { |
4702 | DBG("Application socket %d is being teardown. Abort event notify", | |
4703 | sock); | |
4704 | ret = 0; | |
d5d629b5 DG |
4705 | free(sig); |
4706 | free(fields); | |
4707 | free(model_emf_uri); | |
d88aee68 DG |
4708 | goto error_rcu_unlock; |
4709 | } | |
d0b96690 | 4710 | |
4950b860 | 4711 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 4712 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
4713 | if (!ua_chan) { |
4714 | DBG("Application channel is being teardown. Abort event notify"); | |
4715 | ret = 0; | |
d5d629b5 DG |
4716 | free(sig); |
4717 | free(fields); | |
4718 | free(model_emf_uri); | |
4950b860 MD |
4719 | goto error_rcu_unlock; |
4720 | } | |
4721 | ||
d0b96690 DG |
4722 | assert(ua_chan->session); |
4723 | ua_sess = ua_chan->session; | |
4724 | ||
7972aab2 DG |
4725 | registry = get_session_registry(ua_sess); |
4726 | assert(registry); | |
4727 | ||
4728 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4729 | chan_reg_key = ua_chan->tracing_channel_id; | |
4730 | } else { | |
4731 | chan_reg_key = ua_chan->key; | |
4732 | } | |
4733 | ||
4734 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4735 | |
d5d629b5 DG |
4736 | /* |
4737 | * From this point on, this call acquires the ownership of the sig, fields | |
4738 | * and model_emf_uri meaning any free are done inside it if needed. These | |
4739 | * three variables MUST NOT be read/write after this. | |
4740 | */ | |
7972aab2 | 4741 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4742 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
9664f59b MD |
4743 | model_emf_uri, ua_sess->buffer_type, &event_id, |
4744 | app); | |
d0b96690 DG |
4745 | |
4746 | /* | |
4747 | * The return value is returned to ustctl so in case of an error, the | |
4748 | * application can be notified. In case of an error, it's important not to | |
4749 | * return a negative error or else the application will get closed. | |
4750 | */ | |
4751 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4752 | if (ret < 0) { | |
4753 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4754 | ERR("UST app reply event failed with ret %d", ret); | |
4755 | } else { | |
4756 | DBG3("UST app reply event failed. Application died"); | |
4757 | } | |
4758 | /* | |
4759 | * No need to wipe the create event since the application socket will | |
4760 | * get close on error hence cleaning up everything by itself. | |
4761 | */ | |
4762 | goto error; | |
4763 | } | |
4764 | ||
7972aab2 DG |
4765 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4766 | name, event_id); | |
d88aee68 | 4767 | |
d0b96690 | 4768 | error: |
7972aab2 | 4769 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4770 | error_rcu_unlock: |
d0b96690 DG |
4771 | rcu_read_unlock(); |
4772 | return ret; | |
4773 | } | |
4774 | ||
d88aee68 DG |
4775 | /* |
4776 | * Handle application notification through the given notify socket. | |
4777 | * | |
4778 | * Return 0 on success or else a negative value. | |
4779 | */ | |
d0b96690 DG |
4780 | int ust_app_recv_notify(int sock) |
4781 | { | |
4782 | int ret; | |
4783 | enum ustctl_notify_cmd cmd; | |
4784 | ||
4785 | DBG3("UST app receiving notify from sock %d", sock); | |
4786 | ||
4787 | ret = ustctl_recv_notify(sock, &cmd); | |
4788 | if (ret < 0) { | |
4789 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4790 | ERR("UST app recv notify failed with ret %d", ret); | |
4791 | } else { | |
4792 | DBG3("UST app recv notify failed. Application died"); | |
4793 | } | |
4794 | goto error; | |
4795 | } | |
4796 | ||
4797 | switch (cmd) { | |
4798 | case USTCTL_NOTIFY_CMD_EVENT: | |
4799 | { | |
4800 | int sobjd, cobjd, loglevel; | |
4801 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4802 | size_t nr_fields; | |
4803 | struct ustctl_field *fields; | |
4804 | ||
4805 | DBG2("UST app ustctl register event received"); | |
4806 | ||
4807 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4808 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4809 | if (ret < 0) { | |
4810 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4811 | ERR("UST app recv event failed with ret %d", ret); | |
4812 | } else { | |
4813 | DBG3("UST app recv event failed. Application died"); | |
4814 | } | |
4815 | goto error; | |
4816 | } | |
4817 | ||
d5d629b5 DG |
4818 | /* |
4819 | * Add event to the UST registry coming from the notify socket. This | |
4820 | * call will free if needed the sig, fields and model_emf_uri. This | |
4821 | * code path loses the ownsership of these variables and transfer them | |
4822 | * to the this function. | |
4823 | */ | |
d0b96690 DG |
4824 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
4825 | fields, loglevel, model_emf_uri); | |
4826 | if (ret < 0) { | |
4827 | goto error; | |
4828 | } | |
4829 | ||
4830 | break; | |
4831 | } | |
4832 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4833 | { | |
4834 | int sobjd, cobjd; | |
4835 | size_t nr_fields; | |
4836 | struct ustctl_field *fields; | |
4837 | ||
4838 | DBG2("UST app ustctl register channel received"); | |
4839 | ||
4840 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4841 | &fields); | |
4842 | if (ret < 0) { | |
4843 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4844 | ERR("UST app recv channel failed with ret %d", ret); | |
4845 | } else { | |
4846 | DBG3("UST app recv channel failed. Application died"); | |
4847 | } | |
4848 | goto error; | |
4849 | } | |
4850 | ||
d5d629b5 DG |
4851 | /* |
4852 | * The fields ownership are transfered to this function call meaning | |
4853 | * that if needed it will be freed. After this, it's invalid to access | |
4854 | * fields or clean it up. | |
4855 | */ | |
d0b96690 DG |
4856 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
4857 | fields); | |
4858 | if (ret < 0) { | |
4859 | goto error; | |
4860 | } | |
4861 | ||
4862 | break; | |
4863 | } | |
4864 | default: | |
4865 | /* Should NEVER happen. */ | |
4866 | assert(0); | |
4867 | } | |
4868 | ||
4869 | error: | |
4870 | return ret; | |
4871 | } | |
d88aee68 DG |
4872 | |
4873 | /* | |
4874 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4875 | * corresponding application. On failure, the call_rcu to close the socket is | |
4876 | * executed. If an application is found, it tries to delete it from the notify | |
4877 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4878 | * | |
4879 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4880 | * call RCU is not done but the rest of the cleanup is. | |
4881 | */ | |
4882 | void ust_app_notify_sock_unregister(int sock) | |
4883 | { | |
4884 | int err_enomem = 0; | |
4885 | struct lttng_ht_iter iter; | |
4886 | struct ust_app *app; | |
4887 | struct ust_app_notify_sock_obj *obj; | |
4888 | ||
4889 | assert(sock >= 0); | |
4890 | ||
4891 | rcu_read_lock(); | |
4892 | ||
4893 | obj = zmalloc(sizeof(*obj)); | |
4894 | if (!obj) { | |
4895 | /* | |
4896 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4897 | * procedure but the call_rcu will not be called. In this case, we | |
4898 | * accept the fd leak rather than possibly creating an unsynchronized | |
4899 | * state between threads. | |
4900 | * | |
4901 | * TODO: The notify object should be created once the notify socket is | |
4902 | * registered and stored independantely from the ust app object. The | |
4903 | * tricky part is to synchronize the teardown of the application and | |
4904 | * this notify object. Let's keep that in mind so we can avoid this | |
4905 | * kind of shenanigans with ENOMEM in the teardown path. | |
4906 | */ | |
4907 | err_enomem = 1; | |
4908 | } else { | |
4909 | obj->fd = sock; | |
4910 | } | |
4911 | ||
4912 | DBG("UST app notify socket unregister %d", sock); | |
4913 | ||
4914 | /* | |
4915 | * Lookup application by notify socket. If this fails, this means that the | |
4916 | * hash table delete has already been done by the application | |
4917 | * unregistration process so we can safely close the notify socket in a | |
4918 | * call RCU. | |
4919 | */ | |
4920 | app = find_app_by_notify_sock(sock); | |
4921 | if (!app) { | |
4922 | goto close_socket; | |
4923 | } | |
4924 | ||
4925 | iter.iter.node = &app->notify_sock_n.node; | |
4926 | ||
4927 | /* | |
4928 | * Whatever happens here either we fail or succeed, in both cases we have | |
4929 | * to close the socket after a grace period to continue to the call RCU | |
4930 | * here. If the deletion is successful, the application is not visible | |
4931 | * anymore by other threads and is it fails it means that it was already | |
4932 | * deleted from the hash table so either way we just have to close the | |
4933 | * socket. | |
4934 | */ | |
4935 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4936 | ||
4937 | close_socket: | |
4938 | rcu_read_unlock(); | |
4939 | ||
4940 | /* | |
4941 | * Close socket after a grace period to avoid for the socket to be reused | |
4942 | * before the application object is freed creating potential race between | |
4943 | * threads trying to add unique in the global hash table. | |
4944 | */ | |
4945 | if (!err_enomem) { | |
4946 | call_rcu(&obj->head, close_notify_sock_rcu); | |
4947 | } | |
4948 | } | |
f45e313d DG |
4949 | |
4950 | /* | |
4951 | * Destroy a ust app data structure and free its memory. | |
4952 | */ | |
4953 | void ust_app_destroy(struct ust_app *app) | |
4954 | { | |
4955 | if (!app) { | |
4956 | return; | |
4957 | } | |
4958 | ||
4959 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
4960 | } |