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