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 DG |
40 | #include "ust-ctl.h" |
41 | ||
ffe60014 DG |
42 | /* Next available channel key. */ |
43 | static unsigned long next_channel_key; | |
7972aab2 | 44 | static unsigned long next_session_id; |
ffe60014 DG |
45 | |
46 | /* | |
47 | * Return the atomically incremented value of next_channel_key. | |
48 | */ | |
49 | static inline unsigned long get_next_channel_key(void) | |
50 | { | |
51 | return uatomic_add_return(&next_channel_key, 1); | |
52 | } | |
53 | ||
54 | /* | |
7972aab2 | 55 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 56 | */ |
7972aab2 | 57 | static inline unsigned long get_next_session_id(void) |
ffe60014 | 58 | { |
7972aab2 | 59 | return uatomic_add_return(&next_session_id, 1); |
ffe60014 DG |
60 | } |
61 | ||
d65d2de8 DG |
62 | static void copy_channel_attr_to_ustctl( |
63 | struct ustctl_consumer_channel_attr *attr, | |
64 | struct lttng_ust_channel_attr *uattr) | |
65 | { | |
66 | /* Copy event attributes since the layout is different. */ | |
67 | attr->subbuf_size = uattr->subbuf_size; | |
68 | attr->num_subbuf = uattr->num_subbuf; | |
69 | attr->overwrite = uattr->overwrite; | |
70 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
71 | attr->read_timer_interval = uattr->read_timer_interval; | |
72 | attr->output = uattr->output; | |
73 | } | |
74 | ||
025faf73 DG |
75 | /* |
76 | * Match function for the hash table lookup. | |
77 | * | |
78 | * It matches an ust app event based on three attributes which are the event | |
79 | * name, the filter bytecode and the loglevel. | |
80 | */ | |
18eace3b DG |
81 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
82 | { | |
83 | struct ust_app_event *event; | |
84 | const struct ust_app_ht_key *key; | |
85 | ||
86 | assert(node); | |
87 | assert(_key); | |
88 | ||
89 | event = caa_container_of(node, struct ust_app_event, node.node); | |
90 | key = _key; | |
91 | ||
92 | /* Match the 3 elements of the key: name, filter and loglevel. */ | |
93 | ||
94 | /* Event name */ | |
95 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
96 | goto no_match; | |
97 | } | |
98 | ||
99 | /* Event loglevel. */ | |
100 | if (event->attr.loglevel != key->loglevel) { | |
025faf73 DG |
101 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
102 | && key->loglevel == 0 && event->attr.loglevel == -1) { | |
103 | /* | |
104 | * Match is accepted. This is because on event creation, the | |
105 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
106 | * -1 are accepted for this loglevel type since 0 is the one set by | |
107 | * the API when receiving an enable event. | |
108 | */ | |
109 | } else { | |
110 | goto no_match; | |
111 | } | |
18eace3b DG |
112 | } |
113 | ||
114 | /* One of the filters is NULL, fail. */ | |
115 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
116 | goto no_match; | |
117 | } | |
118 | ||
025faf73 DG |
119 | if (key->filter && event->filter) { |
120 | /* Both filters exists, check length followed by the bytecode. */ | |
121 | if (event->filter->len != key->filter->len || | |
122 | memcmp(event->filter->data, key->filter->data, | |
123 | event->filter->len) != 0) { | |
124 | goto no_match; | |
125 | } | |
18eace3b DG |
126 | } |
127 | ||
025faf73 | 128 | /* Match. */ |
18eace3b DG |
129 | return 1; |
130 | ||
131 | no_match: | |
132 | return 0; | |
18eace3b DG |
133 | } |
134 | ||
025faf73 DG |
135 | /* |
136 | * Unique add of an ust app event in the given ht. This uses the custom | |
137 | * ht_match_ust_app_event match function and the event name as hash. | |
138 | */ | |
d0b96690 | 139 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
140 | struct ust_app_event *event) |
141 | { | |
142 | struct cds_lfht_node *node_ptr; | |
143 | struct ust_app_ht_key key; | |
d0b96690 | 144 | struct lttng_ht *ht; |
18eace3b | 145 | |
d0b96690 DG |
146 | assert(ua_chan); |
147 | assert(ua_chan->events); | |
18eace3b DG |
148 | assert(event); |
149 | ||
d0b96690 | 150 | ht = ua_chan->events; |
18eace3b DG |
151 | key.name = event->attr.name; |
152 | key.filter = event->filter; | |
153 | key.loglevel = event->attr.loglevel; | |
154 | ||
155 | node_ptr = cds_lfht_add_unique(ht->ht, | |
156 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
157 | ht_match_ust_app_event, &key, &event->node.node); | |
158 | assert(node_ptr == &event->node.node); | |
159 | } | |
160 | ||
d88aee68 DG |
161 | /* |
162 | * Close the notify socket from the given RCU head object. This MUST be called | |
163 | * through a call_rcu(). | |
164 | */ | |
165 | static void close_notify_sock_rcu(struct rcu_head *head) | |
166 | { | |
167 | int ret; | |
168 | struct ust_app_notify_sock_obj *obj = | |
169 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
170 | ||
171 | /* Must have a valid fd here. */ | |
172 | assert(obj->fd >= 0); | |
173 | ||
174 | ret = close(obj->fd); | |
175 | if (ret) { | |
176 | ERR("close notify sock %d RCU", obj->fd); | |
177 | } | |
178 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
179 | ||
180 | free(obj); | |
181 | } | |
182 | ||
7972aab2 DG |
183 | /* |
184 | * Return the session registry according to the buffer type of the given | |
185 | * session. | |
186 | * | |
187 | * A registry per UID object MUST exists before calling this function or else | |
188 | * it assert() if not found. RCU read side lock must be acquired. | |
189 | */ | |
190 | static struct ust_registry_session *get_session_registry( | |
191 | struct ust_app_session *ua_sess) | |
192 | { | |
193 | struct ust_registry_session *registry = NULL; | |
194 | ||
195 | assert(ua_sess); | |
196 | ||
197 | switch (ua_sess->buffer_type) { | |
198 | case LTTNG_BUFFER_PER_PID: | |
199 | { | |
200 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
201 | if (!reg_pid) { | |
202 | goto error; | |
203 | } | |
204 | registry = reg_pid->registry->reg.ust; | |
205 | break; | |
206 | } | |
207 | case LTTNG_BUFFER_PER_UID: | |
208 | { | |
209 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
210 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
211 | if (!reg_uid) { | |
212 | goto error; | |
213 | } | |
214 | registry = reg_uid->registry->reg.ust; | |
215 | break; | |
216 | } | |
217 | default: | |
218 | assert(0); | |
219 | }; | |
220 | ||
221 | error: | |
222 | return registry; | |
223 | } | |
224 | ||
55cc08a6 DG |
225 | /* |
226 | * Delete ust context safely. RCU read lock must be held before calling | |
227 | * this function. | |
228 | */ | |
229 | static | |
230 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx) | |
231 | { | |
ffe60014 DG |
232 | int ret; |
233 | ||
234 | assert(ua_ctx); | |
235 | ||
55cc08a6 | 236 | if (ua_ctx->obj) { |
ffe60014 | 237 | ret = ustctl_release_object(sock, ua_ctx->obj); |
d0b96690 DG |
238 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
239 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
240 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 241 | } |
55cc08a6 DG |
242 | free(ua_ctx->obj); |
243 | } | |
244 | free(ua_ctx); | |
245 | } | |
246 | ||
d80a6244 DG |
247 | /* |
248 | * Delete ust app event safely. RCU read lock must be held before calling | |
249 | * this function. | |
250 | */ | |
8b366481 DG |
251 | static |
252 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event) | |
d80a6244 | 253 | { |
ffe60014 DG |
254 | int ret; |
255 | ||
256 | assert(ua_event); | |
257 | ||
53a80697 | 258 | free(ua_event->filter); |
d80a6244 | 259 | |
edb67388 | 260 | if (ua_event->obj != NULL) { |
ffe60014 DG |
261 | ret = ustctl_release_object(sock, ua_event->obj); |
262 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
263 | ERR("UST app sock %d release event obj failed with ret %d", | |
264 | sock, ret); | |
265 | } | |
edb67388 DG |
266 | free(ua_event->obj); |
267 | } | |
d80a6244 DG |
268 | free(ua_event); |
269 | } | |
270 | ||
271 | /* | |
7972aab2 DG |
272 | * Release ust data object of the given stream. |
273 | * | |
274 | * Return 0 on success or else a negative value. | |
d80a6244 | 275 | */ |
7972aab2 | 276 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream) |
d80a6244 | 277 | { |
7972aab2 | 278 | int ret = 0; |
ffe60014 DG |
279 | |
280 | assert(stream); | |
281 | ||
8b366481 | 282 | if (stream->obj) { |
ffe60014 DG |
283 | ret = ustctl_release_object(sock, stream->obj); |
284 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
285 | ERR("UST app sock %d release stream obj failed with ret %d", | |
286 | sock, ret); | |
287 | } | |
4063050c | 288 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
289 | free(stream->obj); |
290 | } | |
7972aab2 DG |
291 | |
292 | return ret; | |
293 | } | |
294 | ||
295 | /* | |
296 | * Delete ust app stream safely. RCU read lock must be held before calling | |
297 | * this function. | |
298 | */ | |
299 | static | |
300 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream) | |
301 | { | |
302 | assert(stream); | |
303 | ||
304 | (void) release_ust_app_stream(sock, stream); | |
84cd17c6 | 305 | free(stream); |
d80a6244 DG |
306 | } |
307 | ||
36b588ed MD |
308 | /* |
309 | * We need to execute ht_destroy outside of RCU read-side critical | |
310 | * section, so we postpone its execution using call_rcu. It is simpler | |
311 | * than to change the semantic of the many callers of | |
312 | * delete_ust_app_channel(). | |
313 | */ | |
314 | static | |
315 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
316 | { | |
317 | struct ust_app_channel *ua_chan = | |
318 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
319 | ||
320 | lttng_ht_destroy(ua_chan->ctx); | |
321 | lttng_ht_destroy(ua_chan->events); | |
322 | free(ua_chan); | |
323 | } | |
324 | ||
d80a6244 DG |
325 | /* |
326 | * Delete ust app channel safely. RCU read lock must be held before calling | |
327 | * this function. | |
328 | */ | |
8b366481 | 329 | static |
d0b96690 DG |
330 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
331 | struct ust_app *app) | |
d80a6244 DG |
332 | { |
333 | int ret; | |
bec39940 | 334 | struct lttng_ht_iter iter; |
d80a6244 | 335 | struct ust_app_event *ua_event; |
55cc08a6 | 336 | struct ust_app_ctx *ua_ctx; |
030a66fa | 337 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 338 | struct ust_registry_session *registry; |
d80a6244 | 339 | |
ffe60014 DG |
340 | assert(ua_chan); |
341 | ||
342 | DBG3("UST app deleting channel %s", ua_chan->name); | |
343 | ||
55cc08a6 | 344 | /* Wipe stream */ |
d80a6244 | 345 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 346 | cds_list_del(&stream->list); |
d80a6244 DG |
347 | delete_ust_app_stream(sock, stream); |
348 | } | |
349 | ||
55cc08a6 | 350 | /* Wipe context */ |
bec39940 DG |
351 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
352 | ret = lttng_ht_del(ua_chan->ctx, &iter); | |
55cc08a6 DG |
353 | assert(!ret); |
354 | delete_ust_app_ctx(sock, ua_ctx); | |
355 | } | |
d80a6244 | 356 | |
55cc08a6 | 357 | /* Wipe events */ |
bec39940 DG |
358 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
359 | node.node) { | |
360 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 361 | assert(!ret); |
d80a6244 DG |
362 | delete_ust_app_event(sock, ua_event); |
363 | } | |
edb67388 | 364 | |
45893984 | 365 | /* Wipe and free registry from session registry. */ |
7972aab2 DG |
366 | registry = get_session_registry(ua_chan->session); |
367 | if (registry) { | |
368 | ust_registry_channel_del_free(registry, ua_chan->key); | |
369 | } | |
d0b96690 | 370 | |
edb67388 | 371 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
372 | /* Remove channel from application UST object descriptor. */ |
373 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
374 | lttng_ht_del(app->ust_objd, &iter); | |
ffe60014 DG |
375 | ret = ustctl_release_object(sock, ua_chan->obj); |
376 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
377 | ERR("UST app sock %d release channel obj failed with ret %d", | |
378 | sock, ret); | |
379 | } | |
7972aab2 | 380 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
381 | free(ua_chan->obj); |
382 | } | |
36b588ed | 383 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
384 | } |
385 | ||
331744e3 | 386 | /* |
1b532a60 DG |
387 | * Push metadata to consumer socket. |
388 | * | |
389 | * The socket lock MUST be acquired. | |
390 | * The ust app session lock MUST be acquired. | |
331744e3 JD |
391 | * |
392 | * On success, return the len of metadata pushed or else a negative value. | |
393 | */ | |
394 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
395 | struct consumer_socket *socket, int send_zero_data) | |
396 | { | |
397 | int ret; | |
398 | char *metadata_str = NULL; | |
399 | size_t len, offset; | |
400 | ssize_t ret_val; | |
401 | ||
402 | assert(registry); | |
403 | assert(socket); | |
1b532a60 DG |
404 | |
405 | /* | |
406 | * On a push metadata error either the consumer is dead or the metadata | |
407 | * channel has been destroyed because its endpoint might have died (e.g: | |
408 | * relayd). If so, the metadata closed flag is set to 1 so we deny pushing | |
409 | * metadata again which is not valid anymore on the consumer side. | |
410 | * | |
411 | * The ust app session mutex locked allows us to make this check without | |
412 | * the registry lock. | |
413 | */ | |
414 | if (registry->metadata_closed) { | |
415 | return -EPIPE; | |
416 | } | |
331744e3 JD |
417 | |
418 | pthread_mutex_lock(®istry->lock); | |
419 | ||
420 | offset = registry->metadata_len_sent; | |
421 | len = registry->metadata_len - registry->metadata_len_sent; | |
422 | if (len == 0) { | |
423 | DBG3("No metadata to push for metadata key %" PRIu64, | |
424 | registry->metadata_key); | |
425 | ret_val = len; | |
426 | if (send_zero_data) { | |
427 | DBG("No metadata to push"); | |
428 | goto push_data; | |
429 | } | |
430 | goto end; | |
431 | } | |
432 | ||
433 | /* Allocate only what we have to send. */ | |
434 | metadata_str = zmalloc(len); | |
435 | if (!metadata_str) { | |
436 | PERROR("zmalloc ust app metadata string"); | |
437 | ret_val = -ENOMEM; | |
438 | goto error; | |
439 | } | |
440 | /* Copy what we haven't send out. */ | |
441 | memcpy(metadata_str, registry->metadata + offset, len); | |
442 | registry->metadata_len_sent += len; | |
443 | ||
444 | push_data: | |
445 | pthread_mutex_unlock(®istry->lock); | |
446 | ret = consumer_push_metadata(socket, registry->metadata_key, | |
447 | metadata_str, len, offset); | |
448 | if (ret < 0) { | |
449 | ret_val = ret; | |
450 | goto error_push; | |
451 | } | |
452 | ||
453 | free(metadata_str); | |
454 | return len; | |
455 | ||
456 | end: | |
457 | error: | |
458 | pthread_mutex_unlock(®istry->lock); | |
459 | error_push: | |
460 | free(metadata_str); | |
461 | return ret_val; | |
462 | } | |
463 | ||
d88aee68 DG |
464 | /* |
465 | * For a given application and session, push metadata to consumer. The session | |
466 | * lock MUST be acquired here before calling this. | |
331744e3 JD |
467 | * Either sock or consumer is required : if sock is NULL, the default |
468 | * socket to send the metadata is retrieved from consumer, if sock | |
469 | * is not NULL we use it to send the metadata. | |
d88aee68 DG |
470 | * |
471 | * Return 0 on success else a negative error. | |
472 | */ | |
7972aab2 DG |
473 | static int push_metadata(struct ust_registry_session *registry, |
474 | struct consumer_output *consumer) | |
d88aee68 | 475 | { |
331744e3 JD |
476 | int ret_val; |
477 | ssize_t ret; | |
d88aee68 DG |
478 | struct consumer_socket *socket; |
479 | ||
7972aab2 DG |
480 | assert(registry); |
481 | assert(consumer); | |
482 | ||
483 | rcu_read_lock(); | |
d88aee68 | 484 | |
7972aab2 DG |
485 | /* |
486 | * Means that no metadata was assigned to the session. This can happens if | |
487 | * no start has been done previously. | |
488 | */ | |
489 | if (!registry->metadata_key) { | |
331744e3 | 490 | ret_val = 0; |
1b532a60 | 491 | goto end_rcu_unlock; |
d88aee68 DG |
492 | } |
493 | ||
d88aee68 | 494 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
495 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
496 | consumer); | |
d88aee68 | 497 | if (!socket) { |
331744e3 | 498 | ret_val = -1; |
d88aee68 DG |
499 | goto error_rcu_unlock; |
500 | } | |
501 | ||
502 | /* | |
503 | * TODO: Currently, we hold the socket lock around sampling of the next | |
504 | * metadata segment to ensure we send metadata over the consumer socket in | |
505 | * the correct order. This makes the registry lock nest inside the socket | |
506 | * lock. | |
507 | * | |
508 | * Please note that this is a temporary measure: we should move this lock | |
509 | * back into ust_consumer_push_metadata() when the consumer gets the | |
510 | * ability to reorder the metadata it receives. | |
511 | */ | |
512 | pthread_mutex_lock(socket->lock); | |
331744e3 JD |
513 | ret = ust_app_push_metadata(registry, socket, 0); |
514 | pthread_mutex_unlock(socket->lock); | |
d88aee68 | 515 | if (ret < 0) { |
331744e3 | 516 | ret_val = ret; |
d88aee68 DG |
517 | goto error_rcu_unlock; |
518 | } | |
519 | ||
d88aee68 | 520 | rcu_read_unlock(); |
d88aee68 DG |
521 | return 0; |
522 | ||
d88aee68 | 523 | error_rcu_unlock: |
1b532a60 DG |
524 | /* |
525 | * On error, flag the registry that the metadata is closed. We were unable | |
526 | * to push anything and this means that either the consumer is not | |
527 | * responding or the metadata cache has been destroyed on the consumer. | |
528 | */ | |
529 | registry->metadata_closed = 1; | |
530 | end_rcu_unlock: | |
d88aee68 | 531 | rcu_read_unlock(); |
331744e3 | 532 | return ret_val; |
d88aee68 DG |
533 | } |
534 | ||
535 | /* | |
536 | * Send to the consumer a close metadata command for the given session. Once | |
537 | * done, the metadata channel is deleted and the session metadata pointer is | |
538 | * nullified. The session lock MUST be acquired here unless the application is | |
539 | * in the destroy path. | |
540 | * | |
541 | * Return 0 on success else a negative value. | |
542 | */ | |
7972aab2 DG |
543 | static int close_metadata(struct ust_registry_session *registry, |
544 | struct consumer_output *consumer) | |
d88aee68 DG |
545 | { |
546 | int ret; | |
547 | struct consumer_socket *socket; | |
548 | ||
7972aab2 DG |
549 | assert(registry); |
550 | assert(consumer); | |
d88aee68 | 551 | |
7972aab2 DG |
552 | rcu_read_lock(); |
553 | ||
554 | if (!registry->metadata_key || registry->metadata_closed) { | |
d88aee68 | 555 | ret = 0; |
1b532a60 | 556 | goto end; |
d88aee68 DG |
557 | } |
558 | ||
d88aee68 | 559 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
560 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
561 | consumer); | |
d88aee68 DG |
562 | if (!socket) { |
563 | ret = -1; | |
7972aab2 | 564 | goto error; |
d88aee68 DG |
565 | } |
566 | ||
7972aab2 | 567 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 568 | if (ret < 0) { |
7972aab2 | 569 | goto error; |
d88aee68 DG |
570 | } |
571 | ||
d88aee68 | 572 | error: |
1b532a60 DG |
573 | /* |
574 | * Metadata closed. Even on error this means that the consumer is not | |
575 | * responding or not found so either way a second close should NOT be emit | |
576 | * for this registry. | |
577 | */ | |
578 | registry->metadata_closed = 1; | |
579 | end: | |
7972aab2 | 580 | rcu_read_unlock(); |
d88aee68 DG |
581 | return ret; |
582 | } | |
583 | ||
36b588ed MD |
584 | /* |
585 | * We need to execute ht_destroy outside of RCU read-side critical | |
586 | * section, so we postpone its execution using call_rcu. It is simpler | |
587 | * than to change the semantic of the many callers of | |
588 | * delete_ust_app_session(). | |
589 | */ | |
590 | static | |
591 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
592 | { | |
593 | struct ust_app_session *ua_sess = | |
594 | caa_container_of(head, struct ust_app_session, rcu_head); | |
595 | ||
596 | lttng_ht_destroy(ua_sess->channels); | |
597 | free(ua_sess); | |
598 | } | |
599 | ||
d80a6244 DG |
600 | /* |
601 | * Delete ust app session safely. RCU read lock must be held before calling | |
602 | * this function. | |
603 | */ | |
8b366481 | 604 | static |
d0b96690 DG |
605 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
606 | struct ust_app *app) | |
d80a6244 DG |
607 | { |
608 | int ret; | |
bec39940 | 609 | struct lttng_ht_iter iter; |
d80a6244 | 610 | struct ust_app_channel *ua_chan; |
7972aab2 | 611 | struct ust_registry_session *registry; |
d80a6244 | 612 | |
d88aee68 DG |
613 | assert(ua_sess); |
614 | ||
1b532a60 DG |
615 | pthread_mutex_lock(&ua_sess->lock); |
616 | ||
7972aab2 | 617 | registry = get_session_registry(ua_sess); |
1b532a60 | 618 | if (registry && !registry->metadata_closed) { |
d88aee68 | 619 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 620 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 621 | |
7972aab2 DG |
622 | /* |
623 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
624 | * metadata only on destroy trace session in this case. Also, the |
625 | * previous push metadata could have flag the metadata registry to | |
626 | * close so don't send a close command if closed. | |
7972aab2 | 627 | */ |
1b532a60 DG |
628 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
629 | !registry->metadata_closed) { | |
7972aab2 DG |
630 | /* And ask to close it for this session registry. */ |
631 | (void) close_metadata(registry, ua_sess->consumer); | |
632 | } | |
d80a6244 DG |
633 | } |
634 | ||
bec39940 DG |
635 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
636 | node.node) { | |
637 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 638 | assert(!ret); |
d0b96690 | 639 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 640 | } |
d80a6244 | 641 | |
7972aab2 DG |
642 | /* In case of per PID, the registry is kept in the session. */ |
643 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
644 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
645 | if (reg_pid) { | |
646 | buffer_reg_pid_remove(reg_pid); | |
647 | buffer_reg_pid_destroy(reg_pid); | |
648 | } | |
649 | } | |
d0b96690 | 650 | |
aee6bafd | 651 | if (ua_sess->handle != -1) { |
ffe60014 DG |
652 | ret = ustctl_release_handle(sock, ua_sess->handle); |
653 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
654 | ERR("UST app sock %d release session handle failed with ret %d", | |
655 | sock, ret); | |
656 | } | |
aee6bafd | 657 | } |
1b532a60 DG |
658 | pthread_mutex_unlock(&ua_sess->lock); |
659 | ||
36b588ed | 660 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 661 | } |
91d76f53 DG |
662 | |
663 | /* | |
284d8f55 DG |
664 | * Delete a traceable application structure from the global list. Never call |
665 | * this function outside of a call_rcu call. | |
36b588ed MD |
666 | * |
667 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 668 | */ |
8b366481 DG |
669 | static |
670 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 671 | { |
8b366481 | 672 | int ret, sock; |
d42f20df | 673 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 674 | |
d80a6244 | 675 | /* Delete ust app sessions info */ |
852d0037 DG |
676 | sock = app->sock; |
677 | app->sock = -1; | |
d80a6244 | 678 | |
8b366481 | 679 | /* Wipe sessions */ |
d42f20df DG |
680 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
681 | teardown_node) { | |
682 | /* Free every object in the session and the session. */ | |
36b588ed | 683 | rcu_read_lock(); |
d0b96690 | 684 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 685 | rcu_read_unlock(); |
d80a6244 | 686 | } |
36b588ed MD |
687 | |
688 | lttng_ht_destroy(app->sessions); | |
7972aab2 | 689 | lttng_ht_destroy(app->ust_objd); |
d80a6244 | 690 | |
6414a713 | 691 | /* |
852d0037 DG |
692 | * Wait until we have deleted the application from the sock hash table |
693 | * before closing this socket, otherwise an application could re-use the | |
694 | * socket ID and race with the teardown, using the same hash table entry. | |
695 | * | |
696 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
697 | * all RCU readers that could run concurrently with unregister app, | |
698 | * therefore we _need_ to only close that socket after a grace period. So | |
699 | * it should stay in this RCU callback. | |
700 | * | |
701 | * This close() is a very important step of the synchronization model so | |
702 | * every modification to this function must be carefully reviewed. | |
6414a713 | 703 | */ |
799e2c4f MD |
704 | ret = close(sock); |
705 | if (ret) { | |
706 | PERROR("close"); | |
707 | } | |
4063050c | 708 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 709 | |
852d0037 | 710 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 711 | free(app); |
099e26bd DG |
712 | } |
713 | ||
714 | /* | |
f6a9efaa | 715 | * URCU intermediate call to delete an UST app. |
099e26bd | 716 | */ |
8b366481 DG |
717 | static |
718 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 719 | { |
bec39940 DG |
720 | struct lttng_ht_node_ulong *node = |
721 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 722 | struct ust_app *app = |
852d0037 | 723 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 724 | |
852d0037 | 725 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 726 | delete_ust_app(app); |
099e26bd DG |
727 | } |
728 | ||
ffe60014 DG |
729 | /* |
730 | * Delete the session from the application ht and delete the data structure by | |
731 | * freeing every object inside and releasing them. | |
732 | */ | |
d0b96690 | 733 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
734 | struct ust_app_session *ua_sess) |
735 | { | |
736 | int ret; | |
737 | struct lttng_ht_iter iter; | |
738 | ||
739 | assert(app); | |
740 | assert(ua_sess); | |
741 | ||
742 | iter.iter.node = &ua_sess->node.node; | |
743 | ret = lttng_ht_del(app->sessions, &iter); | |
744 | if (ret) { | |
745 | /* Already scheduled for teardown. */ | |
746 | goto end; | |
747 | } | |
748 | ||
749 | /* Once deleted, free the data structure. */ | |
d0b96690 | 750 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
751 | |
752 | end: | |
753 | return; | |
754 | } | |
755 | ||
8b366481 DG |
756 | /* |
757 | * Alloc new UST app session. | |
758 | */ | |
759 | static | |
d0b96690 | 760 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
761 | { |
762 | struct ust_app_session *ua_sess; | |
763 | ||
764 | /* Init most of the default value by allocating and zeroing */ | |
765 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
766 | if (ua_sess == NULL) { | |
767 | PERROR("malloc"); | |
ffe60014 | 768 | goto error_free; |
8b366481 DG |
769 | } |
770 | ||
771 | ua_sess->handle = -1; | |
bec39940 | 772 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
d0b96690 | 773 | pthread_mutex_init(&ua_sess->lock, NULL); |
ffe60014 | 774 | |
8b366481 DG |
775 | return ua_sess; |
776 | ||
ffe60014 | 777 | error_free: |
8b366481 DG |
778 | return NULL; |
779 | } | |
780 | ||
781 | /* | |
782 | * Alloc new UST app channel. | |
783 | */ | |
784 | static | |
785 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 786 | struct ust_app_session *ua_sess, |
ffe60014 | 787 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
788 | { |
789 | struct ust_app_channel *ua_chan; | |
790 | ||
791 | /* Init most of the default value by allocating and zeroing */ | |
792 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
793 | if (ua_chan == NULL) { | |
794 | PERROR("malloc"); | |
795 | goto error; | |
796 | } | |
797 | ||
798 | /* Setup channel name */ | |
799 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
800 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
801 | ||
802 | ua_chan->enabled = 1; | |
803 | ua_chan->handle = -1; | |
45893984 | 804 | ua_chan->session = ua_sess; |
ffe60014 | 805 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
806 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
807 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
808 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
809 | |
810 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
811 | ||
812 | /* Copy attributes */ | |
813 | if (attr) { | |
ffe60014 | 814 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
815 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
816 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
817 | ua_chan->attr.overwrite = attr->overwrite; | |
818 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
819 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
820 | ua_chan->attr.output = attr->output; | |
8b366481 | 821 | } |
ffe60014 DG |
822 | /* By default, the channel is a per cpu channel. */ |
823 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
824 | |
825 | DBG3("UST app channel %s allocated", ua_chan->name); | |
826 | ||
827 | return ua_chan; | |
828 | ||
829 | error: | |
830 | return NULL; | |
831 | } | |
832 | ||
37f1c236 DG |
833 | /* |
834 | * Allocate and initialize a UST app stream. | |
835 | * | |
836 | * Return newly allocated stream pointer or NULL on error. | |
837 | */ | |
ffe60014 | 838 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
839 | { |
840 | struct ust_app_stream *stream = NULL; | |
841 | ||
842 | stream = zmalloc(sizeof(*stream)); | |
843 | if (stream == NULL) { | |
844 | PERROR("zmalloc ust app stream"); | |
845 | goto error; | |
846 | } | |
847 | ||
848 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
849 | stream->handle = -1; | |
850 | ||
851 | error: | |
852 | return stream; | |
853 | } | |
854 | ||
8b366481 DG |
855 | /* |
856 | * Alloc new UST app event. | |
857 | */ | |
858 | static | |
859 | struct ust_app_event *alloc_ust_app_event(char *name, | |
860 | struct lttng_ust_event *attr) | |
861 | { | |
862 | struct ust_app_event *ua_event; | |
863 | ||
864 | /* Init most of the default value by allocating and zeroing */ | |
865 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
866 | if (ua_event == NULL) { | |
867 | PERROR("malloc"); | |
868 | goto error; | |
869 | } | |
870 | ||
871 | ua_event->enabled = 1; | |
872 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
873 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 874 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
875 | |
876 | /* Copy attributes */ | |
877 | if (attr) { | |
878 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
879 | } | |
880 | ||
881 | DBG3("UST app event %s allocated", ua_event->name); | |
882 | ||
883 | return ua_event; | |
884 | ||
885 | error: | |
886 | return NULL; | |
887 | } | |
888 | ||
889 | /* | |
890 | * Alloc new UST app context. | |
891 | */ | |
892 | static | |
893 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx) | |
894 | { | |
895 | struct ust_app_ctx *ua_ctx; | |
896 | ||
897 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
898 | if (ua_ctx == NULL) { | |
899 | goto error; | |
900 | } | |
901 | ||
902 | if (uctx) { | |
903 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
904 | } | |
905 | ||
906 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
907 | ||
908 | error: | |
909 | return ua_ctx; | |
910 | } | |
911 | ||
025faf73 DG |
912 | /* |
913 | * Allocate a filter and copy the given original filter. | |
914 | * | |
915 | * Return allocated filter or NULL on error. | |
916 | */ | |
917 | static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter( | |
918 | struct lttng_ust_filter_bytecode *orig_f) | |
919 | { | |
920 | struct lttng_ust_filter_bytecode *filter = NULL; | |
921 | ||
922 | /* Copy filter bytecode */ | |
923 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
924 | if (!filter) { | |
925 | PERROR("zmalloc alloc ust app filter"); | |
926 | goto error; | |
927 | } | |
928 | ||
929 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
930 | ||
931 | error: | |
932 | return filter; | |
933 | } | |
934 | ||
099e26bd | 935 | /* |
421cb601 DG |
936 | * Find an ust_app using the sock and return it. RCU read side lock must be |
937 | * held before calling this helper function. | |
099e26bd | 938 | */ |
8b366481 DG |
939 | static |
940 | struct ust_app *find_app_by_sock(int sock) | |
099e26bd | 941 | { |
bec39940 | 942 | struct lttng_ht_node_ulong *node; |
bec39940 | 943 | struct lttng_ht_iter iter; |
f6a9efaa | 944 | |
852d0037 | 945 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 946 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
947 | if (node == NULL) { |
948 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
949 | goto error; |
950 | } | |
852d0037 DG |
951 | |
952 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
953 | |
954 | error: | |
955 | return NULL; | |
099e26bd DG |
956 | } |
957 | ||
d0b96690 DG |
958 | /* |
959 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
960 | * be held before calling this helper function. | |
961 | */ | |
962 | static struct ust_app *find_app_by_notify_sock(int sock) | |
963 | { | |
964 | struct lttng_ht_node_ulong *node; | |
965 | struct lttng_ht_iter iter; | |
966 | ||
967 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
968 | &iter); | |
969 | node = lttng_ht_iter_get_node_ulong(&iter); | |
970 | if (node == NULL) { | |
971 | DBG2("UST app find by notify sock %d not found", sock); | |
972 | goto error; | |
973 | } | |
974 | ||
975 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
976 | ||
977 | error: | |
978 | return NULL; | |
979 | } | |
980 | ||
025faf73 DG |
981 | /* |
982 | * Lookup for an ust app event based on event name, filter bytecode and the | |
983 | * event loglevel. | |
984 | * | |
985 | * Return an ust_app_event object or NULL on error. | |
986 | */ | |
18eace3b DG |
987 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
988 | char *name, struct lttng_ust_filter_bytecode *filter, int loglevel) | |
989 | { | |
990 | struct lttng_ht_iter iter; | |
991 | struct lttng_ht_node_str *node; | |
992 | struct ust_app_event *event = NULL; | |
993 | struct ust_app_ht_key key; | |
18eace3b DG |
994 | |
995 | assert(name); | |
996 | assert(ht); | |
997 | ||
998 | /* Setup key for event lookup. */ | |
999 | key.name = name; | |
1000 | key.filter = filter; | |
1001 | key.loglevel = loglevel; | |
1002 | ||
025faf73 DG |
1003 | /* Lookup using the event name as hash and a custom match fct. */ |
1004 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1005 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1006 | node = lttng_ht_iter_get_node_str(&iter); |
1007 | if (node == NULL) { | |
1008 | goto end; | |
1009 | } | |
1010 | ||
1011 | event = caa_container_of(node, struct ust_app_event, node); | |
1012 | ||
1013 | end: | |
18eace3b DG |
1014 | return event; |
1015 | } | |
1016 | ||
55cc08a6 DG |
1017 | /* |
1018 | * Create the channel context on the tracer. | |
d0b96690 DG |
1019 | * |
1020 | * Called with UST app session lock held. | |
55cc08a6 DG |
1021 | */ |
1022 | static | |
1023 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1024 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1025 | { | |
1026 | int ret; | |
1027 | ||
840cb59c | 1028 | health_code_update(); |
86acf0da | 1029 | |
852d0037 | 1030 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 DG |
1031 | ua_chan->obj, &ua_ctx->obj); |
1032 | if (ret < 0) { | |
ffe60014 DG |
1033 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1034 | ERR("UST app create channel context failed for app (pid: %d) " | |
1035 | "with ret %d", app->pid, ret); | |
1036 | } else { | |
1037 | DBG3("UST app disable event failed. Application is dead."); | |
1038 | } | |
55cc08a6 DG |
1039 | goto error; |
1040 | } | |
1041 | ||
1042 | ua_ctx->handle = ua_ctx->obj->handle; | |
1043 | ||
d0b96690 DG |
1044 | DBG2("UST app context handle %d created successfully for channel %s", |
1045 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1046 | |
1047 | error: | |
840cb59c | 1048 | health_code_update(); |
55cc08a6 DG |
1049 | return ret; |
1050 | } | |
1051 | ||
53a80697 MD |
1052 | /* |
1053 | * Set the filter on the tracer. | |
1054 | */ | |
1055 | static | |
1056 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1057 | struct ust_app *app) | |
1058 | { | |
1059 | int ret; | |
1060 | ||
840cb59c | 1061 | health_code_update(); |
86acf0da | 1062 | |
53a80697 | 1063 | if (!ua_event->filter) { |
86acf0da DG |
1064 | ret = 0; |
1065 | goto error; | |
53a80697 MD |
1066 | } |
1067 | ||
1068 | ret = ustctl_set_filter(app->sock, ua_event->filter, | |
1069 | ua_event->obj); | |
1070 | if (ret < 0) { | |
ffe60014 DG |
1071 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1072 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1073 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1074 | } else { | |
1075 | DBG3("UST app filter event failed. Application is dead."); | |
1076 | } | |
53a80697 MD |
1077 | goto error; |
1078 | } | |
1079 | ||
1080 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1081 | ||
1082 | error: | |
840cb59c | 1083 | health_code_update(); |
53a80697 MD |
1084 | return ret; |
1085 | } | |
1086 | ||
9730260e DG |
1087 | /* |
1088 | * Disable the specified event on to UST tracer for the UST session. | |
1089 | */ | |
1090 | static int disable_ust_event(struct ust_app *app, | |
1091 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1092 | { | |
1093 | int ret; | |
1094 | ||
840cb59c | 1095 | health_code_update(); |
86acf0da | 1096 | |
852d0037 | 1097 | ret = ustctl_disable(app->sock, ua_event->obj); |
9730260e | 1098 | if (ret < 0) { |
ffe60014 DG |
1099 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1100 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1101 | "and session handle %d with ret %d", | |
1102 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1103 | } else { | |
1104 | DBG3("UST app disable event failed. Application is dead."); | |
1105 | } | |
9730260e DG |
1106 | goto error; |
1107 | } | |
1108 | ||
1109 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1110 | ua_event->attr.name, app->pid); |
9730260e DG |
1111 | |
1112 | error: | |
840cb59c | 1113 | health_code_update(); |
9730260e DG |
1114 | return ret; |
1115 | } | |
1116 | ||
78f0bacd DG |
1117 | /* |
1118 | * Disable the specified channel on to UST tracer for the UST session. | |
1119 | */ | |
1120 | static int disable_ust_channel(struct ust_app *app, | |
1121 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1122 | { | |
1123 | int ret; | |
1124 | ||
840cb59c | 1125 | health_code_update(); |
86acf0da | 1126 | |
852d0037 | 1127 | ret = ustctl_disable(app->sock, ua_chan->obj); |
78f0bacd | 1128 | if (ret < 0) { |
ffe60014 DG |
1129 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1130 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1131 | "and session handle %d with ret %d", | |
1132 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1133 | } else { | |
1134 | DBG3("UST app disable channel failed. Application is dead."); | |
1135 | } | |
78f0bacd DG |
1136 | goto error; |
1137 | } | |
1138 | ||
78f0bacd | 1139 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1140 | ua_chan->name, app->pid); |
78f0bacd DG |
1141 | |
1142 | error: | |
840cb59c | 1143 | health_code_update(); |
78f0bacd DG |
1144 | return ret; |
1145 | } | |
1146 | ||
1147 | /* | |
1148 | * Enable the specified channel on to UST tracer for the UST session. | |
1149 | */ | |
1150 | static int enable_ust_channel(struct ust_app *app, | |
1151 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1152 | { | |
1153 | int ret; | |
1154 | ||
840cb59c | 1155 | health_code_update(); |
86acf0da | 1156 | |
852d0037 | 1157 | ret = ustctl_enable(app->sock, ua_chan->obj); |
78f0bacd | 1158 | if (ret < 0) { |
ffe60014 DG |
1159 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1160 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1161 | "and session handle %d with ret %d", | |
1162 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1163 | } else { | |
1164 | DBG3("UST app enable channel failed. Application is dead."); | |
1165 | } | |
78f0bacd DG |
1166 | goto error; |
1167 | } | |
1168 | ||
1169 | ua_chan->enabled = 1; | |
1170 | ||
1171 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1172 | ua_chan->name, app->pid); |
78f0bacd DG |
1173 | |
1174 | error: | |
840cb59c | 1175 | health_code_update(); |
78f0bacd DG |
1176 | return ret; |
1177 | } | |
1178 | ||
edb67388 DG |
1179 | /* |
1180 | * Enable the specified event on to UST tracer for the UST session. | |
1181 | */ | |
1182 | static int enable_ust_event(struct ust_app *app, | |
1183 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1184 | { | |
1185 | int ret; | |
1186 | ||
840cb59c | 1187 | health_code_update(); |
86acf0da | 1188 | |
852d0037 | 1189 | ret = ustctl_enable(app->sock, ua_event->obj); |
edb67388 | 1190 | if (ret < 0) { |
ffe60014 DG |
1191 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1192 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1193 | "and session handle %d with ret %d", | |
1194 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1195 | } else { | |
1196 | DBG3("UST app enable event failed. Application is dead."); | |
1197 | } | |
edb67388 DG |
1198 | goto error; |
1199 | } | |
1200 | ||
1201 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1202 | ua_event->attr.name, app->pid); |
edb67388 DG |
1203 | |
1204 | error: | |
840cb59c | 1205 | health_code_update(); |
edb67388 DG |
1206 | return ret; |
1207 | } | |
1208 | ||
099e26bd | 1209 | /* |
7972aab2 | 1210 | * Send channel and stream buffer to application. |
4f3ab6ee | 1211 | * |
ffe60014 | 1212 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1213 | */ |
7972aab2 DG |
1214 | static int send_channel_pid_to_ust(struct ust_app *app, |
1215 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1216 | { |
1217 | int ret; | |
ffe60014 | 1218 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1219 | |
1220 | assert(app); | |
ffe60014 | 1221 | assert(ua_sess); |
4f3ab6ee | 1222 | assert(ua_chan); |
4f3ab6ee | 1223 | |
840cb59c | 1224 | health_code_update(); |
4f3ab6ee | 1225 | |
7972aab2 DG |
1226 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1227 | app->sock); | |
86acf0da | 1228 | |
ffe60014 DG |
1229 | /* Send channel to the application. */ |
1230 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
5b4a0ec0 | 1231 | if (ret < 0) { |
b551a063 DG |
1232 | goto error; |
1233 | } | |
1234 | ||
d88aee68 DG |
1235 | health_code_update(); |
1236 | ||
ffe60014 DG |
1237 | /* Send all streams to application. */ |
1238 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1239 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
1240 | if (ret < 0) { | |
1241 | goto error; | |
1242 | } | |
1243 | /* We don't need the stream anymore once sent to the tracer. */ | |
1244 | cds_list_del(&stream->list); | |
1245 | delete_ust_app_stream(-1, stream); | |
1246 | } | |
ffe60014 DG |
1247 | /* Flag the channel that it is sent to the application. */ |
1248 | ua_chan->is_sent = 1; | |
ffe60014 | 1249 | |
b551a063 | 1250 | error: |
840cb59c | 1251 | health_code_update(); |
b551a063 DG |
1252 | return ret; |
1253 | } | |
1254 | ||
91d76f53 | 1255 | /* |
5b4a0ec0 | 1256 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1257 | * |
1258 | * Should be called with session mutex held. | |
91d76f53 | 1259 | */ |
edb67388 DG |
1260 | static |
1261 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1262 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1263 | { |
5b4a0ec0 | 1264 | int ret = 0; |
284d8f55 | 1265 | |
840cb59c | 1266 | health_code_update(); |
86acf0da | 1267 | |
5b4a0ec0 | 1268 | /* Create UST event on tracer */ |
852d0037 | 1269 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 DG |
1270 | &ua_event->obj); |
1271 | if (ret < 0) { | |
ffe60014 DG |
1272 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1273 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1274 | ua_event->attr.name, app->pid, ret); | |
1275 | } else { | |
1276 | DBG3("UST app create event failed. Application is dead."); | |
1277 | } | |
5b4a0ec0 | 1278 | goto error; |
91d76f53 | 1279 | } |
f6a9efaa | 1280 | |
5b4a0ec0 | 1281 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1282 | |
5b4a0ec0 | 1283 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1284 | ua_event->attr.name, app->pid); |
f6a9efaa | 1285 | |
840cb59c | 1286 | health_code_update(); |
86acf0da | 1287 | |
025faf73 DG |
1288 | /* Set filter if one is present. */ |
1289 | if (ua_event->filter) { | |
1290 | ret = set_ust_event_filter(ua_event, app); | |
1291 | if (ret < 0) { | |
1292 | goto error; | |
1293 | } | |
1294 | } | |
1295 | ||
8535a6d9 | 1296 | /* If event not enabled, disable it on the tracer */ |
fc34caaa | 1297 | if (ua_event->enabled == 0) { |
8535a6d9 DG |
1298 | ret = disable_ust_event(app, ua_sess, ua_event); |
1299 | if (ret < 0) { | |
fc34caaa DG |
1300 | /* |
1301 | * If we hit an EPERM, something is wrong with our disable call. If | |
1302 | * we get an EEXIST, there is a problem on the tracer side since we | |
1303 | * just created it. | |
1304 | */ | |
1305 | switch (ret) { | |
49c336c1 | 1306 | case -LTTNG_UST_ERR_PERM: |
fc34caaa DG |
1307 | /* Code flow problem */ |
1308 | assert(0); | |
49c336c1 | 1309 | case -LTTNG_UST_ERR_EXIST: |
fc34caaa DG |
1310 | /* It's OK for our use case. */ |
1311 | ret = 0; | |
1312 | break; | |
1313 | default: | |
1314 | break; | |
1315 | } | |
8535a6d9 DG |
1316 | goto error; |
1317 | } | |
1318 | } | |
1319 | ||
5b4a0ec0 | 1320 | error: |
840cb59c | 1321 | health_code_update(); |
5b4a0ec0 | 1322 | return ret; |
91d76f53 | 1323 | } |
48842b30 | 1324 | |
5b4a0ec0 DG |
1325 | /* |
1326 | * Copy data between an UST app event and a LTT event. | |
1327 | */ | |
421cb601 | 1328 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1329 | struct ltt_ust_event *uevent) |
1330 | { | |
1331 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); | |
1332 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1333 | ||
fc34caaa DG |
1334 | ua_event->enabled = uevent->enabled; |
1335 | ||
5b4a0ec0 DG |
1336 | /* Copy event attributes */ |
1337 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1338 | ||
53a80697 MD |
1339 | /* Copy filter bytecode */ |
1340 | if (uevent->filter) { | |
025faf73 DG |
1341 | ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); |
1342 | /* Filter might be NULL here in case of ENONEM. */ | |
53a80697 | 1343 | } |
48842b30 DG |
1344 | } |
1345 | ||
5b4a0ec0 DG |
1346 | /* |
1347 | * Copy data between an UST app channel and a LTT channel. | |
1348 | */ | |
421cb601 | 1349 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1350 | struct ltt_ust_channel *uchan) |
1351 | { | |
bec39940 | 1352 | struct lttng_ht_iter iter; |
48842b30 | 1353 | struct ltt_ust_event *uevent; |
55cc08a6 | 1354 | struct ltt_ust_context *uctx; |
48842b30 | 1355 | struct ust_app_event *ua_event; |
55cc08a6 | 1356 | struct ust_app_ctx *ua_ctx; |
48842b30 | 1357 | |
fc34caaa | 1358 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1359 | |
1360 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1361 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1362 | |
1624d5b7 JD |
1363 | ua_chan->tracefile_size = uchan->tracefile_size; |
1364 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1365 | ||
ffe60014 DG |
1366 | /* Copy event attributes since the layout is different. */ |
1367 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1368 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1369 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1370 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1371 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1372 | ua_chan->attr.output = uchan->attr.output; | |
1373 | /* | |
1374 | * Note that the attribute channel type is not set since the channel on the | |
1375 | * tracing registry side does not have this information. | |
1376 | */ | |
48842b30 | 1377 | |
fc34caaa | 1378 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1379 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1380 | |
bec39940 | 1381 | cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) { |
55cc08a6 DG |
1382 | ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1383 | if (ua_ctx == NULL) { | |
1384 | continue; | |
1385 | } | |
bec39940 DG |
1386 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1387 | (unsigned long) ua_ctx->ctx.ctx); | |
1388 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
55cc08a6 | 1389 | } |
48842b30 | 1390 | |
421cb601 | 1391 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1392 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b DG |
1393 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
1394 | uevent->filter, uevent->attr.loglevel); | |
1395 | if (ua_event == NULL) { | |
421cb601 | 1396 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1397 | uevent->attr.name); |
284d8f55 | 1398 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1399 | if (ua_event == NULL) { |
5b4a0ec0 | 1400 | continue; |
48842b30 | 1401 | } |
421cb601 | 1402 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1403 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1404 | } |
48842b30 DG |
1405 | } |
1406 | ||
fc34caaa | 1407 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1408 | } |
1409 | ||
5b4a0ec0 DG |
1410 | /* |
1411 | * Copy data between a UST app session and a regular LTT session. | |
1412 | */ | |
421cb601 | 1413 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1414 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1415 | { |
bec39940 DG |
1416 | struct lttng_ht_node_str *ua_chan_node; |
1417 | struct lttng_ht_iter iter; | |
48842b30 DG |
1418 | struct ltt_ust_channel *uchan; |
1419 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1420 | time_t rawtime; |
1421 | struct tm *timeinfo; | |
1422 | char datetime[16]; | |
1423 | int ret; | |
1424 | ||
1425 | /* Get date and time for unique app path */ | |
1426 | time(&rawtime); | |
1427 | timeinfo = localtime(&rawtime); | |
1428 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1429 | |
421cb601 | 1430 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1431 | |
7972aab2 DG |
1432 | ua_sess->tracing_id = usess->id; |
1433 | ua_sess->id = get_next_session_id(); | |
1434 | ua_sess->uid = app->uid; | |
1435 | ua_sess->gid = app->gid; | |
1436 | ua_sess->euid = usess->uid; | |
1437 | ua_sess->egid = usess->gid; | |
1438 | ua_sess->buffer_type = usess->buffer_type; | |
1439 | ua_sess->bits_per_long = app->bits_per_long; | |
1440 | /* There is only one consumer object per session possible. */ | |
1441 | ua_sess->consumer = usess->consumer; | |
1442 | ||
1443 | switch (ua_sess->buffer_type) { | |
1444 | case LTTNG_BUFFER_PER_PID: | |
1445 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1446 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1447 | datetime); |
1448 | break; | |
1449 | case LTTNG_BUFFER_PER_UID: | |
1450 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1451 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1452 | break; | |
1453 | default: | |
1454 | assert(0); | |
1455 | goto error; | |
1456 | } | |
477d7741 MD |
1457 | if (ret < 0) { |
1458 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1459 | assert(0); |
7972aab2 | 1460 | goto error; |
477d7741 MD |
1461 | } |
1462 | ||
48842b30 | 1463 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1464 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1465 | uchan, node.node) { | |
1466 | struct lttng_ht_iter uiter; | |
ba767faf | 1467 | |
bec39940 DG |
1468 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1469 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1470 | if (ua_chan_node != NULL) { |
fc34caaa | 1471 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1472 | continue; |
1473 | } | |
421cb601 | 1474 | |
5b4a0ec0 DG |
1475 | DBG2("Channel %s not found on shadow session copy, creating it", |
1476 | uchan->name); | |
d0b96690 | 1477 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
5b4a0ec0 | 1478 | if (ua_chan == NULL) { |
fc34caaa | 1479 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1480 | continue; |
48842b30 | 1481 | } |
5b4a0ec0 | 1482 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1483 | /* |
1484 | * The concept of metadata channel does not exist on the tracing | |
1485 | * registry side of the session daemon so this can only be a per CPU | |
1486 | * channel and not metadata. | |
1487 | */ | |
1488 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1489 | ||
bec39940 | 1490 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1491 | } |
7972aab2 DG |
1492 | |
1493 | error: | |
1494 | return; | |
48842b30 DG |
1495 | } |
1496 | ||
78f0bacd DG |
1497 | /* |
1498 | * Lookup sesison wrapper. | |
1499 | */ | |
84cd17c6 MD |
1500 | static |
1501 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1502 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1503 | { |
1504 | /* Get right UST app session from app */ | |
2c348c10 | 1505 | lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter); |
84cd17c6 MD |
1506 | } |
1507 | ||
421cb601 DG |
1508 | /* |
1509 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1510 | * id. |
421cb601 | 1511 | */ |
48842b30 DG |
1512 | static struct ust_app_session *lookup_session_by_app( |
1513 | struct ltt_ust_session *usess, struct ust_app *app) | |
1514 | { | |
bec39940 DG |
1515 | struct lttng_ht_iter iter; |
1516 | struct lttng_ht_node_ulong *node; | |
48842b30 | 1517 | |
84cd17c6 | 1518 | __lookup_session_by_app(usess, app, &iter); |
bec39940 | 1519 | node = lttng_ht_iter_get_node_ulong(&iter); |
48842b30 DG |
1520 | if (node == NULL) { |
1521 | goto error; | |
1522 | } | |
1523 | ||
1524 | return caa_container_of(node, struct ust_app_session, node); | |
1525 | ||
1526 | error: | |
1527 | return NULL; | |
1528 | } | |
1529 | ||
7972aab2 DG |
1530 | /* |
1531 | * Setup buffer registry per PID for the given session and application. If none | |
1532 | * is found, a new one is created, added to the global registry and | |
1533 | * initialized. If regp is valid, it's set with the newly created object. | |
1534 | * | |
1535 | * Return 0 on success or else a negative value. | |
1536 | */ | |
1537 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1538 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1539 | { | |
1540 | int ret = 0; | |
1541 | struct buffer_reg_pid *reg_pid; | |
1542 | ||
1543 | assert(ua_sess); | |
1544 | assert(app); | |
1545 | ||
1546 | rcu_read_lock(); | |
1547 | ||
1548 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1549 | if (!reg_pid) { | |
1550 | /* | |
1551 | * This is the create channel path meaning that if there is NO | |
1552 | * registry available, we have to create one for this session. | |
1553 | */ | |
1554 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid); | |
1555 | if (ret < 0) { | |
1556 | goto error; | |
1557 | } | |
1558 | buffer_reg_pid_add(reg_pid); | |
1559 | } else { | |
1560 | goto end; | |
1561 | } | |
1562 | ||
1563 | /* Initialize registry. */ | |
1564 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1565 | app->bits_per_long, app->uint8_t_alignment, | |
1566 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1567 | app->uint64_t_alignment, app->long_alignment, |
1568 | app->byte_order, app->version.major, | |
1569 | app->version.minor); | |
7972aab2 DG |
1570 | if (ret < 0) { |
1571 | goto error; | |
1572 | } | |
1573 | ||
1574 | DBG3("UST app buffer registry per PID created successfully"); | |
1575 | ||
1576 | end: | |
1577 | if (regp) { | |
1578 | *regp = reg_pid; | |
1579 | } | |
1580 | error: | |
1581 | rcu_read_unlock(); | |
1582 | return ret; | |
1583 | } | |
1584 | ||
1585 | /* | |
1586 | * Setup buffer registry per UID for the given session and application. If none | |
1587 | * is found, a new one is created, added to the global registry and | |
1588 | * initialized. If regp is valid, it's set with the newly created object. | |
1589 | * | |
1590 | * Return 0 on success or else a negative value. | |
1591 | */ | |
1592 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
1593 | struct ust_app *app, struct buffer_reg_uid **regp) | |
1594 | { | |
1595 | int ret = 0; | |
1596 | struct buffer_reg_uid *reg_uid; | |
1597 | ||
1598 | assert(usess); | |
1599 | assert(app); | |
1600 | ||
1601 | rcu_read_lock(); | |
1602 | ||
1603 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
1604 | if (!reg_uid) { | |
1605 | /* | |
1606 | * This is the create channel path meaning that if there is NO | |
1607 | * registry available, we have to create one for this session. | |
1608 | */ | |
1609 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
1610 | LTTNG_DOMAIN_UST, ®_uid); | |
1611 | if (ret < 0) { | |
1612 | goto error; | |
1613 | } | |
1614 | buffer_reg_uid_add(reg_uid); | |
1615 | } else { | |
1616 | goto end; | |
1617 | } | |
1618 | ||
1619 | /* Initialize registry. */ | |
af6142cf | 1620 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
1621 | app->bits_per_long, app->uint8_t_alignment, |
1622 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
1623 | app->uint64_t_alignment, app->long_alignment, |
1624 | app->byte_order, app->version.major, | |
1625 | app->version.minor); | |
7972aab2 DG |
1626 | if (ret < 0) { |
1627 | goto error; | |
1628 | } | |
1629 | /* Add node to teardown list of the session. */ | |
1630 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
1631 | ||
1632 | DBG3("UST app buffer registry per UID created successfully"); | |
1633 | ||
1634 | end: | |
1635 | if (regp) { | |
1636 | *regp = reg_uid; | |
1637 | } | |
1638 | error: | |
1639 | rcu_read_unlock(); | |
1640 | return ret; | |
1641 | } | |
1642 | ||
421cb601 | 1643 | /* |
3d8ca23b | 1644 | * Create a session on the tracer side for the given app. |
421cb601 | 1645 | * |
3d8ca23b DG |
1646 | * On success, ua_sess_ptr is populated with the session pointer or else left |
1647 | * untouched. If the session was created, is_created is set to 1. On error, | |
1648 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
1649 | * be NULL. | |
1650 | * | |
1651 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
1652 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 1653 | */ |
3d8ca23b DG |
1654 | static int create_ust_app_session(struct ltt_ust_session *usess, |
1655 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
1656 | int *is_created) | |
421cb601 | 1657 | { |
3d8ca23b | 1658 | int ret, created = 0; |
421cb601 DG |
1659 | struct ust_app_session *ua_sess; |
1660 | ||
3d8ca23b DG |
1661 | assert(usess); |
1662 | assert(app); | |
1663 | assert(ua_sess_ptr); | |
1664 | ||
840cb59c | 1665 | health_code_update(); |
86acf0da | 1666 | |
421cb601 DG |
1667 | ua_sess = lookup_session_by_app(usess, app); |
1668 | if (ua_sess == NULL) { | |
a991f516 | 1669 | DBG2("UST app pid: %d session id %d not found, creating it", |
852d0037 | 1670 | app->pid, usess->id); |
d0b96690 | 1671 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
1672 | if (ua_sess == NULL) { |
1673 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
1674 | ret = -ENOMEM; |
1675 | goto error; | |
421cb601 | 1676 | } |
477d7741 | 1677 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 1678 | created = 1; |
421cb601 DG |
1679 | } |
1680 | ||
7972aab2 DG |
1681 | switch (usess->buffer_type) { |
1682 | case LTTNG_BUFFER_PER_PID: | |
1683 | /* Init local registry. */ | |
1684 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 1685 | if (ret < 0) { |
7972aab2 DG |
1686 | goto error; |
1687 | } | |
1688 | break; | |
1689 | case LTTNG_BUFFER_PER_UID: | |
1690 | /* Look for a global registry. If none exists, create one. */ | |
1691 | ret = setup_buffer_reg_uid(usess, app, NULL); | |
1692 | if (ret < 0) { | |
1693 | goto error; | |
1694 | } | |
1695 | break; | |
1696 | default: | |
1697 | assert(0); | |
1698 | ret = -EINVAL; | |
1699 | goto error; | |
1700 | } | |
1701 | ||
1702 | health_code_update(); | |
1703 | ||
1704 | if (ua_sess->handle == -1) { | |
1705 | ret = ustctl_create_session(app->sock); | |
1706 | if (ret < 0) { | |
1707 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1708 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
1709 | app->pid, ret); |
1710 | } else { | |
1711 | DBG("UST app creating session failed. Application is dead"); | |
1712 | } | |
d0b96690 | 1713 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
1714 | if (ret != -ENOMEM) { |
1715 | /* | |
1716 | * Tracer is probably gone or got an internal error so let's | |
1717 | * behave like it will soon unregister or not usable. | |
1718 | */ | |
1719 | ret = -ENOTCONN; | |
1720 | } | |
1721 | goto error; | |
421cb601 DG |
1722 | } |
1723 | ||
7972aab2 DG |
1724 | ua_sess->handle = ret; |
1725 | ||
1726 | /* Add ust app session to app's HT */ | |
1727 | lttng_ht_node_init_ulong(&ua_sess->node, | |
1728 | (unsigned long) ua_sess->tracing_id); | |
1729 | lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node); | |
1730 | ||
1731 | DBG2("UST app session created successfully with handle %d", ret); | |
1732 | } | |
1733 | ||
1734 | *ua_sess_ptr = ua_sess; | |
1735 | if (is_created) { | |
1736 | *is_created = created; | |
1737 | } | |
1738 | ||
1739 | /* Everything went well. */ | |
1740 | ret = 0; | |
1741 | ||
1742 | error: | |
1743 | health_code_update(); | |
1744 | return ret; | |
1745 | } | |
1746 | ||
1747 | /* | |
1748 | * Create a context for the channel on the tracer. | |
1749 | * | |
1750 | * Called with UST app session lock held and a RCU read side lock. | |
1751 | */ | |
1752 | static | |
1753 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
1754 | struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx, | |
1755 | struct ust_app *app) | |
1756 | { | |
1757 | int ret = 0; | |
1758 | struct lttng_ht_iter iter; | |
1759 | struct lttng_ht_node_ulong *node; | |
1760 | struct ust_app_ctx *ua_ctx; | |
1761 | ||
1762 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
1763 | ||
1764 | lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter); | |
1765 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1766 | if (node != NULL) { | |
1767 | ret = -EEXIST; | |
1768 | goto error; | |
1769 | } | |
1770 | ||
1771 | ua_ctx = alloc_ust_app_ctx(uctx); | |
1772 | if (ua_ctx == NULL) { | |
1773 | /* malloc failed */ | |
1774 | ret = -1; | |
1775 | goto error; | |
1776 | } | |
1777 | ||
1778 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
1779 | lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node); | |
1780 | ||
1781 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
1782 | if (ret < 0) { | |
1783 | goto error; | |
1784 | } | |
1785 | ||
1786 | error: | |
1787 | return ret; | |
1788 | } | |
1789 | ||
1790 | /* | |
1791 | * Enable on the tracer side a ust app event for the session and channel. | |
1792 | * | |
1793 | * Called with UST app session lock held. | |
1794 | */ | |
1795 | static | |
1796 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
1797 | struct ust_app_event *ua_event, struct ust_app *app) | |
1798 | { | |
1799 | int ret; | |
1800 | ||
1801 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1802 | if (ret < 0) { | |
1803 | goto error; | |
1804 | } | |
1805 | ||
1806 | ua_event->enabled = 1; | |
1807 | ||
1808 | error: | |
1809 | return ret; | |
1810 | } | |
1811 | ||
1812 | /* | |
1813 | * Disable on the tracer side a ust app event for the session and channel. | |
1814 | */ | |
1815 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
1816 | struct ust_app_event *ua_event, struct ust_app *app) | |
1817 | { | |
1818 | int ret; | |
1819 | ||
1820 | ret = disable_ust_event(app, ua_sess, ua_event); | |
1821 | if (ret < 0) { | |
1822 | goto error; | |
1823 | } | |
1824 | ||
1825 | ua_event->enabled = 0; | |
1826 | ||
1827 | error: | |
1828 | return ret; | |
1829 | } | |
1830 | ||
1831 | /* | |
1832 | * Lookup ust app channel for session and disable it on the tracer side. | |
1833 | */ | |
1834 | static | |
1835 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
1836 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
1837 | { | |
1838 | int ret; | |
1839 | ||
1840 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
1841 | if (ret < 0) { | |
1842 | goto error; | |
1843 | } | |
1844 | ||
1845 | ua_chan->enabled = 0; | |
1846 | ||
1847 | error: | |
1848 | return ret; | |
1849 | } | |
1850 | ||
1851 | /* | |
1852 | * Lookup ust app channel for session and enable it on the tracer side. This | |
1853 | * MUST be called with a RCU read side lock acquired. | |
1854 | */ | |
1855 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
1856 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
1857 | { | |
1858 | int ret = 0; | |
1859 | struct lttng_ht_iter iter; | |
1860 | struct lttng_ht_node_str *ua_chan_node; | |
1861 | struct ust_app_channel *ua_chan; | |
1862 | ||
1863 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
1864 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
1865 | if (ua_chan_node == NULL) { | |
1866 | DBG2("Unable to find channel %s in ust session id %u", | |
1867 | uchan->name, ua_sess->tracing_id); | |
1868 | goto error; | |
1869 | } | |
1870 | ||
1871 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
1872 | ||
1873 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
1874 | if (ret < 0) { | |
1875 | goto error; | |
1876 | } | |
1877 | ||
1878 | error: | |
1879 | return ret; | |
1880 | } | |
1881 | ||
1882 | /* | |
1883 | * Ask the consumer to create a channel and get it if successful. | |
1884 | * | |
1885 | * Return 0 on success or else a negative value. | |
1886 | */ | |
1887 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
1888 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
1889 | int bitness, struct ust_registry_session *registry) | |
1890 | { | |
1891 | int ret; | |
1892 | unsigned int nb_fd = 0; | |
1893 | struct consumer_socket *socket; | |
1894 | ||
1895 | assert(usess); | |
1896 | assert(ua_sess); | |
1897 | assert(ua_chan); | |
1898 | assert(registry); | |
1899 | ||
1900 | rcu_read_lock(); | |
1901 | health_code_update(); | |
1902 | ||
1903 | /* Get the right consumer socket for the application. */ | |
1904 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
1905 | if (!socket) { | |
1906 | ret = -EINVAL; | |
1907 | goto error; | |
1908 | } | |
1909 | ||
1910 | health_code_update(); | |
1911 | ||
1912 | /* Need one fd for the channel. */ | |
1913 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
1914 | if (ret < 0) { | |
1915 | ERR("Exhausted number of available FD upon create channel"); | |
1916 | goto error; | |
1917 | } | |
1918 | ||
1919 | /* | |
1920 | * Ask consumer to create channel. The consumer will return the number of | |
1921 | * stream we have to expect. | |
1922 | */ | |
1923 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
1924 | registry); | |
1925 | if (ret < 0) { | |
1926 | goto error_ask; | |
1927 | } | |
1928 | ||
1929 | /* | |
1930 | * Compute the number of fd needed before receiving them. It must be 2 per | |
1931 | * stream (2 being the default value here). | |
1932 | */ | |
1933 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
1934 | ||
1935 | /* Reserve the amount of file descriptor we need. */ | |
1936 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
1937 | if (ret < 0) { | |
1938 | ERR("Exhausted number of available FD upon create channel"); | |
1939 | goto error_fd_get_stream; | |
1940 | } | |
1941 | ||
1942 | health_code_update(); | |
1943 | ||
1944 | /* | |
1945 | * Now get the channel from the consumer. This call wil populate the stream | |
1946 | * list of that channel and set the ust objects. | |
1947 | */ | |
1948 | ret = ust_consumer_get_channel(socket, ua_chan); | |
1949 | if (ret < 0) { | |
1950 | goto error_destroy; | |
1951 | } | |
1952 | ||
1953 | rcu_read_unlock(); | |
1954 | return 0; | |
1955 | ||
1956 | error_destroy: | |
1957 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
1958 | error_fd_get_stream: | |
1959 | /* | |
1960 | * Initiate a destroy channel on the consumer since we had an error | |
1961 | * handling it on our side. The return value is of no importance since we | |
1962 | * already have a ret value set by the previous error that we need to | |
1963 | * return. | |
1964 | */ | |
1965 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
1966 | error_ask: | |
1967 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
1968 | error: | |
1969 | health_code_update(); | |
1970 | rcu_read_unlock(); | |
1971 | return ret; | |
1972 | } | |
1973 | ||
1974 | /* | |
1975 | * Duplicate the ust data object of the ust app stream and save it in the | |
1976 | * buffer registry stream. | |
1977 | * | |
1978 | * Return 0 on success or else a negative value. | |
1979 | */ | |
1980 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
1981 | struct ust_app_stream *stream) | |
1982 | { | |
1983 | int ret; | |
1984 | ||
1985 | assert(reg_stream); | |
1986 | assert(stream); | |
1987 | ||
1988 | /* Reserve the amount of file descriptor we need. */ | |
1989 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
1990 | if (ret < 0) { | |
1991 | ERR("Exhausted number of available FD upon duplicate stream"); | |
1992 | goto error; | |
1993 | } | |
1994 | ||
1995 | /* Duplicate object for stream once the original is in the registry. */ | |
1996 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
1997 | reg_stream->obj.ust); | |
1998 | if (ret < 0) { | |
1999 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2000 | reg_stream->obj.ust, stream->obj, ret); | |
2001 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2002 | goto error; | |
2003 | } | |
2004 | stream->handle = stream->obj->handle; | |
2005 | ||
2006 | error: | |
2007 | return ret; | |
2008 | } | |
2009 | ||
2010 | /* | |
2011 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2012 | * buffer registry channel. | |
2013 | * | |
2014 | * Return 0 on success or else a negative value. | |
2015 | */ | |
2016 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2017 | struct ust_app_channel *ua_chan) | |
2018 | { | |
2019 | int ret; | |
2020 | ||
2021 | assert(reg_chan); | |
2022 | assert(ua_chan); | |
2023 | ||
2024 | /* Need two fds for the channel. */ | |
2025 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2026 | if (ret < 0) { | |
2027 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2028 | goto error_fd_get; | |
2029 | } | |
2030 | ||
2031 | /* Duplicate object for stream once the original is in the registry. */ | |
2032 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2033 | if (ret < 0) { | |
2034 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2035 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2036 | goto error; | |
2037 | } | |
2038 | ua_chan->handle = ua_chan->obj->handle; | |
2039 | ||
2040 | return 0; | |
2041 | ||
2042 | error: | |
2043 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2044 | error_fd_get: | |
2045 | return ret; | |
2046 | } | |
2047 | ||
2048 | /* | |
2049 | * For a given channel buffer registry, setup all streams of the given ust | |
2050 | * application channel. | |
2051 | * | |
2052 | * Return 0 on success or else a negative value. | |
2053 | */ | |
2054 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
2055 | struct ust_app_channel *ua_chan) | |
2056 | { | |
2057 | int ret = 0; | |
2058 | struct ust_app_stream *stream, *stmp; | |
2059 | ||
2060 | assert(reg_chan); | |
2061 | assert(ua_chan); | |
2062 | ||
2063 | DBG2("UST app setup buffer registry stream"); | |
2064 | ||
2065 | /* Send all streams to application. */ | |
2066 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2067 | struct buffer_reg_stream *reg_stream; | |
2068 | ||
2069 | ret = buffer_reg_stream_create(®_stream); | |
2070 | if (ret < 0) { | |
2071 | goto error; | |
2072 | } | |
2073 | ||
2074 | /* | |
2075 | * Keep original pointer and nullify it in the stream so the delete | |
2076 | * stream call does not release the object. | |
2077 | */ | |
2078 | reg_stream->obj.ust = stream->obj; | |
2079 | stream->obj = NULL; | |
2080 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2081 | |
7972aab2 DG |
2082 | /* We don't need the streams anymore. */ |
2083 | cds_list_del(&stream->list); | |
2084 | delete_ust_app_stream(-1, stream); | |
2085 | } | |
421cb601 | 2086 | |
7972aab2 DG |
2087 | error: |
2088 | return ret; | |
2089 | } | |
2090 | ||
2091 | /* | |
2092 | * Create a buffer registry channel for the given session registry and | |
2093 | * application channel object. If regp pointer is valid, it's set with the | |
2094 | * created object. Important, the created object is NOT added to the session | |
2095 | * registry hash table. | |
2096 | * | |
2097 | * Return 0 on success else a negative value. | |
2098 | */ | |
2099 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2100 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2101 | { | |
2102 | int ret; | |
2103 | struct buffer_reg_channel *reg_chan = NULL; | |
2104 | ||
2105 | assert(reg_sess); | |
2106 | assert(ua_chan); | |
2107 | ||
2108 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2109 | ||
2110 | /* Create buffer registry channel. */ | |
2111 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2112 | if (ret < 0) { | |
2113 | goto error_create; | |
421cb601 | 2114 | } |
7972aab2 DG |
2115 | assert(reg_chan); |
2116 | reg_chan->consumer_key = ua_chan->key; | |
421cb601 | 2117 | |
7972aab2 DG |
2118 | /* Create and add a channel registry to session. */ |
2119 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2120 | ua_chan->tracing_channel_id); | |
2121 | if (ret < 0) { | |
2122 | goto error; | |
d88aee68 | 2123 | } |
7972aab2 | 2124 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2125 | |
7972aab2 DG |
2126 | if (regp) { |
2127 | *regp = reg_chan; | |
3d8ca23b | 2128 | } |
d88aee68 | 2129 | |
7972aab2 | 2130 | return 0; |
3d8ca23b DG |
2131 | |
2132 | error: | |
7972aab2 DG |
2133 | /* Safe because the registry channel object was not added to any HT. */ |
2134 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2135 | error_create: | |
3d8ca23b | 2136 | return ret; |
421cb601 DG |
2137 | } |
2138 | ||
55cc08a6 | 2139 | /* |
7972aab2 DG |
2140 | * Setup buffer registry channel for the given session registry and application |
2141 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2142 | * |
7972aab2 | 2143 | * Return 0 on success else a negative value. |
55cc08a6 | 2144 | */ |
7972aab2 DG |
2145 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
2146 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan) | |
55cc08a6 | 2147 | { |
7972aab2 | 2148 | int ret; |
55cc08a6 | 2149 | |
7972aab2 DG |
2150 | assert(reg_sess); |
2151 | assert(reg_chan); | |
2152 | assert(ua_chan); | |
2153 | assert(ua_chan->obj); | |
55cc08a6 | 2154 | |
7972aab2 | 2155 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2156 | |
7972aab2 DG |
2157 | /* Setup all streams for the registry. */ |
2158 | ret = setup_buffer_reg_streams(reg_chan, ua_chan); | |
2159 | if (ret < 0) { | |
55cc08a6 DG |
2160 | goto error; |
2161 | } | |
2162 | ||
7972aab2 DG |
2163 | reg_chan->obj.ust = ua_chan->obj; |
2164 | ua_chan->obj = NULL; | |
55cc08a6 | 2165 | |
7972aab2 | 2166 | return 0; |
55cc08a6 DG |
2167 | |
2168 | error: | |
7972aab2 DG |
2169 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2170 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2171 | return ret; |
2172 | } | |
2173 | ||
edb67388 | 2174 | /* |
7972aab2 | 2175 | * Send buffer registry channel to the application. |
d0b96690 | 2176 | * |
7972aab2 | 2177 | * Return 0 on success else a negative value. |
edb67388 | 2178 | */ |
7972aab2 DG |
2179 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2180 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2181 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2182 | { |
2183 | int ret; | |
7972aab2 | 2184 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2185 | |
7972aab2 DG |
2186 | assert(reg_chan); |
2187 | assert(app); | |
2188 | assert(ua_sess); | |
2189 | assert(ua_chan); | |
2190 | ||
2191 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2192 | ||
2193 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2194 | if (ret < 0) { |
2195 | goto error; | |
2196 | } | |
2197 | ||
7972aab2 DG |
2198 | /* Send channel to the application. */ |
2199 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
2200 | if (ret < 0) { | |
2201 | goto error; | |
2202 | } | |
2203 | ||
2204 | health_code_update(); | |
2205 | ||
2206 | /* Send all streams to application. */ | |
2207 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2208 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2209 | struct ust_app_stream stream; | |
2210 | ||
2211 | ret = duplicate_stream_object(reg_stream, &stream); | |
2212 | if (ret < 0) { | |
2213 | goto error_stream_unlock; | |
2214 | } | |
2215 | ||
2216 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2217 | if (ret < 0) { | |
8c067051 | 2218 | (void) release_ust_app_stream(-1, &stream); |
7972aab2 DG |
2219 | goto error_stream_unlock; |
2220 | } | |
edb67388 | 2221 | |
7972aab2 DG |
2222 | /* |
2223 | * The return value is not important here. This function will output an | |
2224 | * error if needed. | |
2225 | */ | |
2226 | (void) release_ust_app_stream(-1, &stream); | |
2227 | } | |
2228 | ua_chan->is_sent = 1; | |
2229 | ||
2230 | error_stream_unlock: | |
2231 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2232 | error: |
2233 | return ret; | |
2234 | } | |
2235 | ||
9730260e | 2236 | /* |
7972aab2 DG |
2237 | * Create and send to the application the created buffers with per UID buffers. |
2238 | * | |
2239 | * Return 0 on success else a negative value. | |
9730260e | 2240 | */ |
7972aab2 DG |
2241 | static int create_channel_per_uid(struct ust_app *app, |
2242 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2243 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2244 | { |
2245 | int ret; | |
7972aab2 DG |
2246 | struct buffer_reg_uid *reg_uid; |
2247 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2248 | |
7972aab2 DG |
2249 | assert(app); |
2250 | assert(usess); | |
2251 | assert(ua_sess); | |
2252 | assert(ua_chan); | |
2253 | ||
2254 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2255 | ||
2256 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2257 | /* | |
2258 | * The session creation handles the creation of this global registry | |
2259 | * object. If none can be find, there is a code flow problem or a | |
2260 | * teardown race. | |
2261 | */ | |
2262 | assert(reg_uid); | |
2263 | ||
2264 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2265 | reg_uid); | |
2266 | if (!reg_chan) { | |
2267 | /* Create the buffer registry channel object. */ | |
2268 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2269 | if (ret < 0) { | |
2270 | goto error; | |
2271 | } | |
2272 | assert(reg_chan); | |
2273 | ||
2274 | /* | |
2275 | * Create the buffers on the consumer side. This call populates the | |
2276 | * ust app channel object with all streams and data object. | |
2277 | */ | |
2278 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2279 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2280 | if (ret < 0) { | |
07d2ae95 DG |
2281 | /* |
2282 | * Let's remove the previously created buffer registry channel so | |
2283 | * it's not visible anymore in the session registry. | |
2284 | */ | |
2285 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2286 | ua_chan->tracing_channel_id); | |
2287 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2288 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2289 | goto error; |
2290 | } | |
2291 | ||
2292 | /* | |
2293 | * Setup the streams and add it to the session registry. | |
2294 | */ | |
2295 | ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan); | |
2296 | if (ret < 0) { | |
2297 | goto error; | |
2298 | } | |
2299 | ||
2300 | } | |
2301 | ||
2302 | /* Send buffers to the application. */ | |
2303 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e DG |
2304 | if (ret < 0) { |
2305 | goto error; | |
2306 | } | |
2307 | ||
9730260e DG |
2308 | error: |
2309 | return ret; | |
2310 | } | |
2311 | ||
78f0bacd | 2312 | /* |
7972aab2 DG |
2313 | * Create and send to the application the created buffers with per PID buffers. |
2314 | * | |
2315 | * Return 0 on success else a negative value. | |
78f0bacd | 2316 | */ |
7972aab2 DG |
2317 | static int create_channel_per_pid(struct ust_app *app, |
2318 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2319 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2320 | { |
8535a6d9 | 2321 | int ret; |
7972aab2 | 2322 | struct ust_registry_session *registry; |
78f0bacd | 2323 | |
7972aab2 DG |
2324 | assert(app); |
2325 | assert(usess); | |
2326 | assert(ua_sess); | |
2327 | assert(ua_chan); | |
2328 | ||
2329 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2330 | ||
2331 | rcu_read_lock(); | |
2332 | ||
2333 | registry = get_session_registry(ua_sess); | |
2334 | assert(registry); | |
2335 | ||
2336 | /* Create and add a new channel registry to session. */ | |
2337 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd DG |
2338 | if (ret < 0) { |
2339 | goto error; | |
2340 | } | |
2341 | ||
7972aab2 DG |
2342 | /* Create and get channel on the consumer side. */ |
2343 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2344 | app->bits_per_long, registry); | |
2345 | if (ret < 0) { | |
2346 | goto error; | |
2347 | } | |
2348 | ||
2349 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2350 | if (ret < 0) { | |
2351 | goto error; | |
2352 | } | |
8535a6d9 | 2353 | |
78f0bacd | 2354 | error: |
7972aab2 | 2355 | rcu_read_unlock(); |
78f0bacd DG |
2356 | return ret; |
2357 | } | |
2358 | ||
2359 | /* | |
7972aab2 DG |
2360 | * From an already allocated ust app channel, create the channel buffers if |
2361 | * need and send it to the application. This MUST be called with a RCU read | |
2362 | * side lock acquired. | |
2363 | * | |
2364 | * Return 0 on success or else a negative value. | |
78f0bacd | 2365 | */ |
7972aab2 DG |
2366 | static int do_create_channel(struct ust_app *app, |
2367 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2368 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2369 | { |
7972aab2 | 2370 | int ret; |
78f0bacd | 2371 | |
7972aab2 DG |
2372 | assert(app); |
2373 | assert(usess); | |
2374 | assert(ua_sess); | |
2375 | assert(ua_chan); | |
2376 | ||
2377 | /* Handle buffer type before sending the channel to the application. */ | |
2378 | switch (usess->buffer_type) { | |
2379 | case LTTNG_BUFFER_PER_UID: | |
2380 | { | |
2381 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2382 | if (ret < 0) { | |
2383 | goto error; | |
2384 | } | |
2385 | break; | |
2386 | } | |
2387 | case LTTNG_BUFFER_PER_PID: | |
2388 | { | |
2389 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
2390 | if (ret < 0) { | |
2391 | goto error; | |
2392 | } | |
2393 | break; | |
2394 | } | |
2395 | default: | |
2396 | assert(0); | |
2397 | ret = -EINVAL; | |
78f0bacd DG |
2398 | goto error; |
2399 | } | |
2400 | ||
7972aab2 DG |
2401 | /* Initialize ust objd object using the received handle and add it. */ |
2402 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
2403 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 2404 | |
7972aab2 DG |
2405 | /* If channel is not enabled, disable it on the tracer */ |
2406 | if (!ua_chan->enabled) { | |
2407 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2408 | if (ret < 0) { | |
2409 | goto error; | |
2410 | } | |
78f0bacd DG |
2411 | } |
2412 | ||
2413 | error: | |
2414 | return ret; | |
2415 | } | |
2416 | ||
284d8f55 | 2417 | /* |
4d710ac2 DG |
2418 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
2419 | * newly created channel if not NULL. | |
d0b96690 | 2420 | * |
36b588ed | 2421 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 DG |
2422 | * |
2423 | * Return 0 on success or else a negative value. | |
284d8f55 | 2424 | */ |
4d710ac2 DG |
2425 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
2426 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 2427 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 2428 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
2429 | { |
2430 | int ret = 0; | |
bec39940 DG |
2431 | struct lttng_ht_iter iter; |
2432 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
2433 | struct ust_app_channel *ua_chan; |
2434 | ||
2435 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
2436 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
2437 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 2438 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 2439 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 2440 | goto end; |
5b4a0ec0 DG |
2441 | } |
2442 | ||
d0b96690 | 2443 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
2444 | if (ua_chan == NULL) { |
2445 | /* Only malloc can fail here */ | |
4d710ac2 | 2446 | ret = -ENOMEM; |
094d1690 | 2447 | goto error_alloc; |
fc34caaa DG |
2448 | } |
2449 | shadow_copy_channel(ua_chan, uchan); | |
2450 | ||
ffe60014 DG |
2451 | /* Set channel type. */ |
2452 | ua_chan->attr.type = type; | |
2453 | ||
7972aab2 | 2454 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
2455 | if (ret < 0) { |
2456 | goto error; | |
2457 | } | |
2458 | ||
fc34caaa | 2459 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 2460 | app->pid); |
fc34caaa | 2461 | |
d0b96690 DG |
2462 | /* Only add the channel if successful on the tracer side. */ |
2463 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
2464 | ||
fc34caaa | 2465 | end: |
4d710ac2 DG |
2466 | if (ua_chanp) { |
2467 | *ua_chanp = ua_chan; | |
2468 | } | |
2469 | ||
2470 | /* Everything went well. */ | |
2471 | return 0; | |
5b4a0ec0 DG |
2472 | |
2473 | error: | |
d0b96690 | 2474 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 2475 | error_alloc: |
4d710ac2 | 2476 | return ret; |
5b4a0ec0 DG |
2477 | } |
2478 | ||
2479 | /* | |
2480 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
2481 | * |
2482 | * Called with ust app session mutex held. | |
5b4a0ec0 | 2483 | */ |
edb67388 DG |
2484 | static |
2485 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
2486 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
2487 | struct ust_app *app) | |
284d8f55 | 2488 | { |
edb67388 | 2489 | int ret = 0; |
5b4a0ec0 | 2490 | struct ust_app_event *ua_event; |
284d8f55 | 2491 | |
5b4a0ec0 | 2492 | /* Get event node */ |
18eace3b DG |
2493 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
2494 | uevent->filter, uevent->attr.loglevel); | |
2495 | if (ua_event != NULL) { | |
fc34caaa | 2496 | ret = -EEXIST; |
edb67388 DG |
2497 | goto end; |
2498 | } | |
5b4a0ec0 | 2499 | |
edb67388 DG |
2500 | /* Does not exist so create one */ |
2501 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
2502 | if (ua_event == NULL) { | |
2503 | /* Only malloc can failed so something is really wrong */ | |
2504 | ret = -ENOMEM; | |
fc34caaa | 2505 | goto end; |
5b4a0ec0 | 2506 | } |
edb67388 | 2507 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 2508 | |
edb67388 | 2509 | /* Create it on the tracer side */ |
5b4a0ec0 | 2510 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 2511 | if (ret < 0) { |
fc34caaa | 2512 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 2513 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
2514 | goto error; |
2515 | } | |
2516 | ||
d0b96690 | 2517 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 2518 | |
fc34caaa | 2519 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 2520 | app->pid); |
7f79d3a1 | 2521 | |
edb67388 | 2522 | end: |
fc34caaa DG |
2523 | return ret; |
2524 | ||
5b4a0ec0 | 2525 | error: |
fc34caaa DG |
2526 | /* Valid. Calling here is already in a read side lock */ |
2527 | delete_ust_app_event(-1, ua_event); | |
edb67388 | 2528 | return ret; |
5b4a0ec0 DG |
2529 | } |
2530 | ||
2531 | /* | |
2532 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 2533 | * |
7972aab2 | 2534 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
2535 | */ |
2536 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
d65d2de8 DG |
2537 | struct ust_app *app, struct consumer_output *consumer, |
2538 | struct ustctl_consumer_channel_attr *attr) | |
5b4a0ec0 DG |
2539 | { |
2540 | int ret = 0; | |
ffe60014 | 2541 | struct ust_app_channel *metadata; |
d88aee68 | 2542 | struct consumer_socket *socket; |
7972aab2 | 2543 | struct ust_registry_session *registry; |
5b4a0ec0 | 2544 | |
ffe60014 DG |
2545 | assert(ua_sess); |
2546 | assert(app); | |
d88aee68 | 2547 | assert(consumer); |
5b4a0ec0 | 2548 | |
7972aab2 DG |
2549 | registry = get_session_registry(ua_sess); |
2550 | assert(registry); | |
2551 | ||
1b532a60 DG |
2552 | /* Metadata already exists for this registry or it was closed previously */ |
2553 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
2554 | ret = 0; |
2555 | goto error; | |
5b4a0ec0 DG |
2556 | } |
2557 | ||
ffe60014 | 2558 | /* Allocate UST metadata */ |
d0b96690 | 2559 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
2560 | if (!metadata) { |
2561 | /* malloc() failed */ | |
2562 | ret = -ENOMEM; | |
2563 | goto error; | |
2564 | } | |
5b4a0ec0 | 2565 | |
d65d2de8 DG |
2566 | if (!attr) { |
2567 | /* Set default attributes for metadata. */ | |
2568 | metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
2569 | metadata->attr.subbuf_size = default_get_metadata_subbuf_size(); | |
2570 | metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; | |
0a9c6494 DG |
2571 | metadata->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER; |
2572 | metadata->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER; | |
d65d2de8 DG |
2573 | metadata->attr.output = LTTNG_UST_MMAP; |
2574 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2575 | } else { | |
2576 | memcpy(&metadata->attr, attr, sizeof(metadata->attr)); | |
2577 | metadata->attr.output = LTTNG_UST_MMAP; | |
2578 | metadata->attr.type = LTTNG_UST_CHAN_METADATA; | |
2579 | } | |
5b4a0ec0 | 2580 | |
7972aab2 DG |
2581 | /* Need one fd for the channel. */ |
2582 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2583 | if (ret < 0) { | |
2584 | ERR("Exhausted number of available FD upon create metadata"); | |
2585 | goto error; | |
2586 | } | |
2587 | ||
4dc3dfc5 DG |
2588 | /* Get the right consumer socket for the application. */ |
2589 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
2590 | if (!socket) { | |
2591 | ret = -EINVAL; | |
2592 | goto error_consumer; | |
2593 | } | |
2594 | ||
331744e3 JD |
2595 | /* |
2596 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
2597 | * to the registry *before* we ask the consumer so we avoid the race of the | |
2598 | * consumer requesting the metadata and the ask_channel call on our side | |
2599 | * did not returned yet. | |
2600 | */ | |
2601 | registry->metadata_key = metadata->key; | |
2602 | ||
d88aee68 DG |
2603 | /* |
2604 | * Ask the metadata channel creation to the consumer. The metadata object | |
2605 | * will be created by the consumer and kept their. However, the stream is | |
2606 | * never added or monitored until we do a first push metadata to the | |
2607 | * consumer. | |
2608 | */ | |
7972aab2 DG |
2609 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
2610 | registry); | |
d88aee68 | 2611 | if (ret < 0) { |
7972aab2 DG |
2612 | /* |
2613 | * Safe because the metadata obj pointer is not set so the delete below | |
2614 | * will not put a FD back again. | |
2615 | */ | |
d88aee68 DG |
2616 | goto error_consumer; |
2617 | } | |
2618 | ||
2619 | /* | |
2620 | * The setup command will make the metadata stream be sent to the relayd, | |
2621 | * if applicable, and the thread managing the metadatas. This is important | |
2622 | * because after this point, if an error occurs, the only way the stream | |
2623 | * can be deleted is to be monitored in the consumer. | |
2624 | */ | |
7972aab2 | 2625 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 2626 | if (ret < 0) { |
7972aab2 DG |
2627 | /* |
2628 | * Safe because the metadata obj pointer is not set so the delete below | |
2629 | * will not put a FD back again. | |
2630 | */ | |
d88aee68 | 2631 | goto error_consumer; |
5b4a0ec0 DG |
2632 | } |
2633 | ||
7972aab2 DG |
2634 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
2635 | metadata->key, app->pid); | |
5b4a0ec0 | 2636 | |
d88aee68 | 2637 | error_consumer: |
b80f0b6c | 2638 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 2639 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 2640 | error: |
ffe60014 | 2641 | return ret; |
5b4a0ec0 DG |
2642 | } |
2643 | ||
2644 | /* | |
2645 | * Return pointer to traceable apps list. | |
2646 | */ | |
bec39940 | 2647 | struct lttng_ht *ust_app_get_ht(void) |
5b4a0ec0 DG |
2648 | { |
2649 | return ust_app_ht; | |
2650 | } | |
2651 | ||
2652 | /* | |
d88aee68 DG |
2653 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
2654 | * acquired before calling this function. | |
5b4a0ec0 DG |
2655 | */ |
2656 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
2657 | { | |
d88aee68 | 2658 | struct ust_app *app = NULL; |
bec39940 DG |
2659 | struct lttng_ht_node_ulong *node; |
2660 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 2661 | |
bec39940 DG |
2662 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
2663 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
2664 | if (node == NULL) { |
2665 | DBG2("UST app no found with pid %d", pid); | |
2666 | goto error; | |
2667 | } | |
5b4a0ec0 DG |
2668 | |
2669 | DBG2("Found UST app by pid %d", pid); | |
2670 | ||
d88aee68 | 2671 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
2672 | |
2673 | error: | |
d88aee68 | 2674 | return app; |
5b4a0ec0 DG |
2675 | } |
2676 | ||
d88aee68 DG |
2677 | /* |
2678 | * Allocate and init an UST app object using the registration information and | |
2679 | * the command socket. This is called when the command socket connects to the | |
2680 | * session daemon. | |
2681 | * | |
2682 | * The object is returned on success or else NULL. | |
2683 | */ | |
d0b96690 | 2684 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 2685 | { |
d0b96690 DG |
2686 | struct ust_app *lta = NULL; |
2687 | ||
2688 | assert(msg); | |
2689 | assert(sock >= 0); | |
2690 | ||
2691 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 2692 | |
173af62f DG |
2693 | if ((msg->bits_per_long == 64 && |
2694 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
2695 | || (msg->bits_per_long == 32 && | |
2696 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 2697 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
2698 | "%d-bit long, but no consumerd for this size is available.\n", |
2699 | msg->name, msg->pid, msg->bits_per_long); | |
2700 | goto error; | |
3f2c5fcc | 2701 | } |
d0b96690 | 2702 | |
5b4a0ec0 DG |
2703 | lta = zmalloc(sizeof(struct ust_app)); |
2704 | if (lta == NULL) { | |
2705 | PERROR("malloc"); | |
d0b96690 | 2706 | goto error; |
5b4a0ec0 DG |
2707 | } |
2708 | ||
2709 | lta->ppid = msg->ppid; | |
2710 | lta->uid = msg->uid; | |
2711 | lta->gid = msg->gid; | |
d0b96690 | 2712 | |
7753dea8 | 2713 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
2714 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
2715 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
2716 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
2717 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
2718 | lta->long_alignment = msg->long_alignment; | |
2719 | lta->byte_order = msg->byte_order; | |
2720 | ||
5b4a0ec0 DG |
2721 | lta->v_major = msg->major; |
2722 | lta->v_minor = msg->minor; | |
bec39940 | 2723 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 DG |
2724 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2725 | lta->notify_sock = -1; | |
d88aee68 DG |
2726 | |
2727 | /* Copy name and make sure it's NULL terminated. */ | |
2728 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
2729 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
2730 | ||
2731 | /* | |
2732 | * Before this can be called, when receiving the registration information, | |
2733 | * the application compatibility is checked. So, at this point, the | |
2734 | * application can work with this session daemon. | |
2735 | */ | |
d0b96690 | 2736 | lta->compatible = 1; |
5b4a0ec0 | 2737 | |
852d0037 | 2738 | lta->pid = msg->pid; |
d0b96690 | 2739 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 2740 | lta->sock = sock; |
d0b96690 | 2741 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 2742 | |
d42f20df DG |
2743 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
2744 | ||
d0b96690 DG |
2745 | error: |
2746 | return lta; | |
2747 | } | |
2748 | ||
d88aee68 DG |
2749 | /* |
2750 | * For a given application object, add it to every hash table. | |
2751 | */ | |
d0b96690 DG |
2752 | void ust_app_add(struct ust_app *app) |
2753 | { | |
2754 | assert(app); | |
2755 | assert(app->notify_sock >= 0); | |
2756 | ||
5b4a0ec0 | 2757 | rcu_read_lock(); |
852d0037 DG |
2758 | |
2759 | /* | |
2760 | * On a re-registration, we want to kick out the previous registration of | |
2761 | * that pid | |
2762 | */ | |
d0b96690 | 2763 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
2764 | |
2765 | /* | |
2766 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
2767 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
2768 | * already in the table. | |
2769 | */ | |
d0b96690 | 2770 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 2771 | |
d0b96690 DG |
2772 | /* Add application to the notify socket hash table. */ |
2773 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
2774 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 2775 | |
d0b96690 | 2776 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
2777 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
2778 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
2779 | app->v_minor); | |
5b4a0ec0 | 2780 | |
d0b96690 DG |
2781 | rcu_read_unlock(); |
2782 | } | |
2783 | ||
d88aee68 DG |
2784 | /* |
2785 | * Set the application version into the object. | |
2786 | * | |
2787 | * Return 0 on success else a negative value either an errno code or a | |
2788 | * LTTng-UST error code. | |
2789 | */ | |
d0b96690 DG |
2790 | int ust_app_version(struct ust_app *app) |
2791 | { | |
d88aee68 DG |
2792 | int ret; |
2793 | ||
d0b96690 | 2794 | assert(app); |
d88aee68 DG |
2795 | |
2796 | ret = ustctl_tracer_version(app->sock, &app->version); | |
2797 | if (ret < 0) { | |
2798 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
2799 | ERR("UST app %d verson failed with ret %d", app->sock, ret); | |
2800 | } else { | |
2801 | DBG3("UST app %d verion failed. Application is dead", app->sock); | |
2802 | } | |
2803 | } | |
2804 | ||
2805 | return ret; | |
5b4a0ec0 DG |
2806 | } |
2807 | ||
2808 | /* | |
2809 | * Unregister app by removing it from the global traceable app list and freeing | |
2810 | * the data struct. | |
2811 | * | |
2812 | * The socket is already closed at this point so no close to sock. | |
2813 | */ | |
2814 | void ust_app_unregister(int sock) | |
2815 | { | |
2816 | struct ust_app *lta; | |
bec39940 DG |
2817 | struct lttng_ht_node_ulong *node; |
2818 | struct lttng_ht_iter iter; | |
d42f20df | 2819 | struct ust_app_session *ua_sess; |
525b0740 | 2820 | int ret; |
5b4a0ec0 DG |
2821 | |
2822 | rcu_read_lock(); | |
886459c6 | 2823 | |
5b4a0ec0 | 2824 | /* Get the node reference for a call_rcu */ |
852d0037 | 2825 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 2826 | node = lttng_ht_iter_get_node_ulong(&iter); |
d0b96690 | 2827 | assert(node); |
284d8f55 | 2828 | |
852d0037 | 2829 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
2830 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
2831 | ||
886459c6 | 2832 | /* Remove application from PID hash table */ |
852d0037 DG |
2833 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
2834 | assert(!ret); | |
2835 | ||
d88aee68 DG |
2836 | /* |
2837 | * Remove application from notify hash table. The thread handling the | |
2838 | * notify socket could have deleted the node so ignore on error because | |
2839 | * either way it's valid. The close of that socket is handled by the other | |
2840 | * thread. | |
2841 | */ | |
d0b96690 | 2842 | iter.iter.node = <a->notify_sock_n.node; |
d88aee68 | 2843 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); |
852d0037 | 2844 | |
5b98a774 DG |
2845 | /* |
2846 | * Ignore return value since the node might have been removed before by an | |
2847 | * add replace during app registration because the PID can be reassigned by | |
2848 | * the OS. | |
2849 | */ | |
d0b96690 | 2850 | iter.iter.node = <a->pid_n.node; |
bec39940 | 2851 | ret = lttng_ht_del(ust_app_ht, &iter); |
5b98a774 DG |
2852 | if (ret) { |
2853 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
2854 | lta->pid); | |
2855 | } | |
852d0037 | 2856 | |
d42f20df DG |
2857 | /* Remove sessions so they are not visible during deletion.*/ |
2858 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, | |
2859 | node.node) { | |
7972aab2 DG |
2860 | struct ust_registry_session *registry; |
2861 | ||
d42f20df DG |
2862 | ret = lttng_ht_del(lta->sessions, &iter); |
2863 | if (ret) { | |
2864 | /* The session was already removed so scheduled for teardown. */ | |
2865 | continue; | |
2866 | } | |
2867 | ||
2868 | /* | |
2869 | * Add session to list for teardown. This is safe since at this point we | |
2870 | * are the only one using this list. | |
2871 | */ | |
d88aee68 DG |
2872 | pthread_mutex_lock(&ua_sess->lock); |
2873 | ||
2874 | /* | |
2875 | * Normally, this is done in the delete session process which is | |
2876 | * executed in the call rcu below. However, upon registration we can't | |
2877 | * afford to wait for the grace period before pushing data or else the | |
2878 | * data pending feature can race between the unregistration and stop | |
2879 | * command where the data pending command is sent *before* the grace | |
2880 | * period ended. | |
2881 | * | |
2882 | * The close metadata below nullifies the metadata pointer in the | |
2883 | * session so the delete session will NOT push/close a second time. | |
2884 | */ | |
7972aab2 | 2885 | registry = get_session_registry(ua_sess); |
1b532a60 | 2886 | if (registry && !registry->metadata_closed) { |
7972aab2 DG |
2887 | /* Push metadata for application before freeing the application. */ |
2888 | (void) push_metadata(registry, ua_sess->consumer); | |
2889 | ||
2890 | /* | |
2891 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
2892 | * metadata only on destroy trace session in this case. Also, the |
2893 | * previous push metadata could have flag the metadata registry to | |
2894 | * close so don't send a close command if closed. | |
7972aab2 | 2895 | */ |
1b532a60 DG |
2896 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID && |
2897 | !registry->metadata_closed) { | |
7972aab2 DG |
2898 | /* And ask to close it for this session registry. */ |
2899 | (void) close_metadata(registry, ua_sess->consumer); | |
2900 | } | |
2901 | } | |
d88aee68 | 2902 | |
d42f20df | 2903 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
d88aee68 | 2904 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
2905 | } |
2906 | ||
852d0037 DG |
2907 | /* Free memory */ |
2908 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
2909 | ||
5b4a0ec0 DG |
2910 | rcu_read_unlock(); |
2911 | return; | |
284d8f55 DG |
2912 | } |
2913 | ||
2914 | /* | |
5b4a0ec0 | 2915 | * Return traceable_app_count |
284d8f55 | 2916 | */ |
5b4a0ec0 | 2917 | unsigned long ust_app_list_count(void) |
284d8f55 | 2918 | { |
5b4a0ec0 | 2919 | unsigned long count; |
284d8f55 | 2920 | |
5b4a0ec0 | 2921 | rcu_read_lock(); |
bec39940 | 2922 | count = lttng_ht_get_count(ust_app_ht); |
5b4a0ec0 | 2923 | rcu_read_unlock(); |
284d8f55 | 2924 | |
5b4a0ec0 | 2925 | return count; |
284d8f55 DG |
2926 | } |
2927 | ||
5b4a0ec0 DG |
2928 | /* |
2929 | * Fill events array with all events name of all registered apps. | |
2930 | */ | |
2931 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 2932 | { |
5b4a0ec0 DG |
2933 | int ret, handle; |
2934 | size_t nbmem, count = 0; | |
bec39940 | 2935 | struct lttng_ht_iter iter; |
5b4a0ec0 | 2936 | struct ust_app *app; |
c617c0c6 | 2937 | struct lttng_event *tmp_event; |
421cb601 | 2938 | |
5b4a0ec0 | 2939 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
2940 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
2941 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
2942 | PERROR("zmalloc ust app events"); |
2943 | ret = -ENOMEM; | |
421cb601 DG |
2944 | goto error; |
2945 | } | |
2946 | ||
5b4a0ec0 | 2947 | rcu_read_lock(); |
421cb601 | 2948 | |
852d0037 | 2949 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 2950 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 2951 | |
840cb59c | 2952 | health_code_update(); |
86acf0da | 2953 | |
e0c7ec2b DG |
2954 | if (!app->compatible) { |
2955 | /* | |
2956 | * TODO: In time, we should notice the caller of this error by | |
2957 | * telling him that this is a version error. | |
2958 | */ | |
2959 | continue; | |
2960 | } | |
852d0037 | 2961 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 2962 | if (handle < 0) { |
ffe60014 DG |
2963 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
2964 | ERR("UST app list events getting handle failed for app pid %d", | |
2965 | app->pid); | |
2966 | } | |
5b4a0ec0 DG |
2967 | continue; |
2968 | } | |
421cb601 | 2969 | |
852d0037 | 2970 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 2971 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
2972 | /* Handle ustctl error. */ |
2973 | if (ret < 0) { | |
2974 | free(tmp_event); | |
2975 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
2976 | ERR("UST app tp list get failed for app %d with ret %d", | |
2977 | app->sock, ret); | |
2978 | } else { | |
2979 | DBG3("UST app tp list get failed. Application is dead"); | |
2980 | } | |
2981 | goto rcu_error; | |
2982 | } | |
2983 | ||
840cb59c | 2984 | health_code_update(); |
815564d8 | 2985 | if (count >= nbmem) { |
d7b3776f | 2986 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
2987 | void *ptr; |
2988 | ||
815564d8 MD |
2989 | DBG2("Reallocating event list from %zu to %zu entries", nbmem, |
2990 | 2 * nbmem); | |
2991 | nbmem *= 2; | |
c617c0c6 MD |
2992 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event)); |
2993 | if (ptr == NULL) { | |
5b4a0ec0 | 2994 | PERROR("realloc ust app events"); |
c617c0c6 | 2995 | free(tmp_event); |
5b4a0ec0 DG |
2996 | ret = -ENOMEM; |
2997 | goto rcu_error; | |
2998 | } | |
c617c0c6 | 2999 | tmp_event = ptr; |
5b4a0ec0 | 3000 | } |
c617c0c6 MD |
3001 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3002 | tmp_event[count].loglevel = uiter.loglevel; | |
3003 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3004 | tmp_event[count].pid = app->pid; | |
3005 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3006 | count++; |
421cb601 | 3007 | } |
421cb601 DG |
3008 | } |
3009 | ||
5b4a0ec0 | 3010 | ret = count; |
c617c0c6 | 3011 | *events = tmp_event; |
421cb601 | 3012 | |
5b4a0ec0 | 3013 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3014 | |
5b4a0ec0 DG |
3015 | rcu_error: |
3016 | rcu_read_unlock(); | |
421cb601 | 3017 | error: |
840cb59c | 3018 | health_code_update(); |
5b4a0ec0 | 3019 | return ret; |
421cb601 DG |
3020 | } |
3021 | ||
f37d259d MD |
3022 | /* |
3023 | * Fill events array with all events name of all registered apps. | |
3024 | */ | |
3025 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3026 | { | |
3027 | int ret, handle; | |
3028 | size_t nbmem, count = 0; | |
3029 | struct lttng_ht_iter iter; | |
3030 | struct ust_app *app; | |
c617c0c6 | 3031 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3032 | |
3033 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3034 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3035 | if (tmp_event == NULL) { | |
f37d259d MD |
3036 | PERROR("zmalloc ust app event fields"); |
3037 | ret = -ENOMEM; | |
3038 | goto error; | |
3039 | } | |
3040 | ||
3041 | rcu_read_lock(); | |
3042 | ||
3043 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3044 | struct lttng_ust_field_iter uiter; | |
3045 | ||
840cb59c | 3046 | health_code_update(); |
86acf0da | 3047 | |
f37d259d MD |
3048 | if (!app->compatible) { |
3049 | /* | |
3050 | * TODO: In time, we should notice the caller of this error by | |
3051 | * telling him that this is a version error. | |
3052 | */ | |
3053 | continue; | |
3054 | } | |
3055 | handle = ustctl_tracepoint_field_list(app->sock); | |
3056 | if (handle < 0) { | |
ffe60014 DG |
3057 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3058 | ERR("UST app list field getting handle failed for app pid %d", | |
3059 | app->pid); | |
3060 | } | |
f37d259d MD |
3061 | continue; |
3062 | } | |
3063 | ||
3064 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3065 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3066 | /* Handle ustctl error. */ |
3067 | if (ret < 0) { | |
3068 | free(tmp_event); | |
3069 | if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) { | |
3070 | ERR("UST app tp list field failed for app %d with ret %d", | |
3071 | app->sock, ret); | |
3072 | } else { | |
3073 | DBG3("UST app tp list field failed. Application is dead"); | |
3074 | } | |
3075 | goto rcu_error; | |
3076 | } | |
3077 | ||
840cb59c | 3078 | health_code_update(); |
f37d259d | 3079 | if (count >= nbmem) { |
d7b3776f | 3080 | /* In case the realloc fails, we free the memory */ |
c617c0c6 MD |
3081 | void *ptr; |
3082 | ||
f37d259d MD |
3083 | DBG2("Reallocating event field list from %zu to %zu entries", nbmem, |
3084 | 2 * nbmem); | |
3085 | nbmem *= 2; | |
c617c0c6 MD |
3086 | ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field)); |
3087 | if (ptr == NULL) { | |
f37d259d | 3088 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3089 | free(tmp_event); |
f37d259d MD |
3090 | ret = -ENOMEM; |
3091 | goto rcu_error; | |
3092 | } | |
c617c0c6 | 3093 | tmp_event = ptr; |
f37d259d | 3094 | } |
f37d259d | 3095 | |
c617c0c6 MD |
3096 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
3097 | tmp_event[count].type = uiter.type; | |
3098 | tmp_event[count].nowrite = uiter.nowrite; | |
f37d259d | 3099 | |
c617c0c6 MD |
3100 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3101 | tmp_event[count].event.loglevel = uiter.loglevel; | |
3102 | tmp_event[count].event.type = LTTNG_UST_TRACEPOINT; | |
3103 | tmp_event[count].event.pid = app->pid; | |
3104 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3105 | count++; |
3106 | } | |
3107 | } | |
3108 | ||
3109 | ret = count; | |
c617c0c6 | 3110 | *fields = tmp_event; |
f37d259d MD |
3111 | |
3112 | DBG2("UST app list event fields done (%zu events)", count); | |
3113 | ||
3114 | rcu_error: | |
3115 | rcu_read_unlock(); | |
3116 | error: | |
840cb59c | 3117 | health_code_update(); |
f37d259d MD |
3118 | return ret; |
3119 | } | |
3120 | ||
5b4a0ec0 DG |
3121 | /* |
3122 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3123 | * |
3124 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3125 | */ |
3126 | void ust_app_clean_list(void) | |
421cb601 | 3127 | { |
5b4a0ec0 | 3128 | int ret; |
659ed79f | 3129 | struct ust_app *app; |
bec39940 | 3130 | struct lttng_ht_iter iter; |
421cb601 | 3131 | |
5b4a0ec0 | 3132 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3133 | |
5b4a0ec0 | 3134 | rcu_read_lock(); |
421cb601 | 3135 | |
659ed79f | 3136 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3137 | ret = lttng_ht_del(ust_app_ht, &iter); |
525b0740 | 3138 | assert(!ret); |
659ed79f | 3139 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); |
421cb601 DG |
3140 | } |
3141 | ||
852d0037 | 3142 | /* Cleanup socket hash table */ |
659ed79f DG |
3143 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, |
3144 | sock_n.node) { | |
852d0037 | 3145 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); |
bec39940 DG |
3146 | assert(!ret); |
3147 | } | |
852d0037 | 3148 | |
d88aee68 DG |
3149 | /* Cleanup notify socket hash table */ |
3150 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3151 | notify_sock_n.node) { | |
3152 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3153 | assert(!ret); | |
3154 | } | |
36b588ed | 3155 | rcu_read_unlock(); |
d88aee68 | 3156 | |
bec39940 | 3157 | /* Destroy is done only when the ht is empty */ |
852d0037 DG |
3158 | lttng_ht_destroy(ust_app_ht); |
3159 | lttng_ht_destroy(ust_app_ht_by_sock); | |
d88aee68 | 3160 | lttng_ht_destroy(ust_app_ht_by_notify_sock); |
5b4a0ec0 DG |
3161 | } |
3162 | ||
3163 | /* | |
3164 | * Init UST app hash table. | |
3165 | */ | |
3166 | void ust_app_ht_alloc(void) | |
3167 | { | |
bec39940 | 3168 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
852d0037 | 3169 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3170 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
421cb601 DG |
3171 | } |
3172 | ||
78f0bacd DG |
3173 | /* |
3174 | * For a specific UST session, disable the channel for all registered apps. | |
3175 | */ | |
35a9059d | 3176 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3177 | struct ltt_ust_channel *uchan) |
3178 | { | |
3179 | int ret = 0; | |
bec39940 DG |
3180 | struct lttng_ht_iter iter; |
3181 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3182 | struct ust_app *app; |
3183 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3184 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3185 | |
3186 | if (usess == NULL || uchan == NULL) { | |
3187 | ERR("Disabling UST global channel with NULL values"); | |
3188 | ret = -1; | |
3189 | goto error; | |
3190 | } | |
3191 | ||
a991f516 MD |
3192 | DBG2("UST app disabling channel %s from global domain for session id %d", |
3193 | uchan->name, usess->id); | |
78f0bacd DG |
3194 | |
3195 | rcu_read_lock(); | |
3196 | ||
3197 | /* For every registered applications */ | |
852d0037 | 3198 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3199 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3200 | if (!app->compatible) { |
3201 | /* | |
3202 | * TODO: In time, we should notice the caller of this error by | |
3203 | * telling him that this is a version error. | |
3204 | */ | |
3205 | continue; | |
3206 | } | |
78f0bacd DG |
3207 | ua_sess = lookup_session_by_app(usess, app); |
3208 | if (ua_sess == NULL) { | |
3209 | continue; | |
3210 | } | |
3211 | ||
8535a6d9 | 3212 | /* Get channel */ |
bec39940 DG |
3213 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3214 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3215 | /* If the session if found for the app, the channel must be there */ |
3216 | assert(ua_chan_node); | |
3217 | ||
3218 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3219 | /* The channel must not be already disabled */ | |
3220 | assert(ua_chan->enabled == 1); | |
3221 | ||
3222 | /* Disable channel onto application */ | |
3223 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3224 | if (ret < 0) { |
3225 | /* XXX: We might want to report this error at some point... */ | |
3226 | continue; | |
3227 | } | |
3228 | } | |
3229 | ||
3230 | rcu_read_unlock(); | |
3231 | ||
3232 | error: | |
3233 | return ret; | |
3234 | } | |
3235 | ||
3236 | /* | |
3237 | * For a specific UST session, enable the channel for all registered apps. | |
3238 | */ | |
35a9059d | 3239 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3240 | struct ltt_ust_channel *uchan) |
3241 | { | |
3242 | int ret = 0; | |
bec39940 | 3243 | struct lttng_ht_iter iter; |
78f0bacd DG |
3244 | struct ust_app *app; |
3245 | struct ust_app_session *ua_sess; | |
3246 | ||
3247 | if (usess == NULL || uchan == NULL) { | |
3248 | ERR("Adding UST global channel to NULL values"); | |
3249 | ret = -1; | |
3250 | goto error; | |
3251 | } | |
3252 | ||
a991f516 MD |
3253 | DBG2("UST app enabling channel %s to global domain for session id %d", |
3254 | uchan->name, usess->id); | |
78f0bacd DG |
3255 | |
3256 | rcu_read_lock(); | |
3257 | ||
3258 | /* For every registered applications */ | |
852d0037 | 3259 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3260 | if (!app->compatible) { |
3261 | /* | |
3262 | * TODO: In time, we should notice the caller of this error by | |
3263 | * telling him that this is a version error. | |
3264 | */ | |
3265 | continue; | |
3266 | } | |
78f0bacd DG |
3267 | ua_sess = lookup_session_by_app(usess, app); |
3268 | if (ua_sess == NULL) { | |
3269 | continue; | |
3270 | } | |
3271 | ||
3272 | /* Enable channel onto application */ | |
3273 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3274 | if (ret < 0) { | |
3275 | /* XXX: We might want to report this error at some point... */ | |
3276 | continue; | |
3277 | } | |
3278 | } | |
3279 | ||
3280 | rcu_read_unlock(); | |
3281 | ||
3282 | error: | |
3283 | return ret; | |
3284 | } | |
3285 | ||
b0a40d28 DG |
3286 | /* |
3287 | * Disable an event in a channel and for a specific session. | |
3288 | */ | |
35a9059d DG |
3289 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3290 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3291 | { |
3292 | int ret = 0; | |
bec39940 DG |
3293 | struct lttng_ht_iter iter, uiter; |
3294 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
b0a40d28 DG |
3295 | struct ust_app *app; |
3296 | struct ust_app_session *ua_sess; | |
3297 | struct ust_app_channel *ua_chan; | |
3298 | struct ust_app_event *ua_event; | |
3299 | ||
3300 | DBG("UST app disabling event %s for all apps in channel " | |
a991f516 | 3301 | "%s for session id %d", uevent->attr.name, uchan->name, usess->id); |
b0a40d28 DG |
3302 | |
3303 | rcu_read_lock(); | |
3304 | ||
3305 | /* For all registered applications */ | |
852d0037 | 3306 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3307 | if (!app->compatible) { |
3308 | /* | |
3309 | * TODO: In time, we should notice the caller of this error by | |
3310 | * telling him that this is a version error. | |
3311 | */ | |
3312 | continue; | |
3313 | } | |
b0a40d28 DG |
3314 | ua_sess = lookup_session_by_app(usess, app); |
3315 | if (ua_sess == NULL) { | |
3316 | /* Next app */ | |
3317 | continue; | |
3318 | } | |
3319 | ||
3320 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3321 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3322 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 3323 | if (ua_chan_node == NULL) { |
a991f516 | 3324 | DBG2("Channel %s not found in session id %d for app pid %d." |
852d0037 | 3325 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
3326 | continue; |
3327 | } | |
3328 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3329 | ||
bec39940 DG |
3330 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); |
3331 | ua_event_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 DG |
3332 | if (ua_event_node == NULL) { |
3333 | DBG2("Event %s not found in channel %s for app pid %d." | |
852d0037 | 3334 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
3335 | continue; |
3336 | } | |
3337 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
3338 | ||
7f79d3a1 | 3339 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
3340 | if (ret < 0) { |
3341 | /* XXX: Report error someday... */ | |
3342 | continue; | |
3343 | } | |
3344 | } | |
3345 | ||
3346 | rcu_read_unlock(); | |
3347 | ||
3348 | return ret; | |
3349 | } | |
3350 | ||
9730260e | 3351 | /* |
edb67388 | 3352 | * For a specific UST session and UST channel, the event for all |
9730260e DG |
3353 | * registered apps. |
3354 | */ | |
35a9059d | 3355 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
9730260e DG |
3356 | struct ltt_ust_channel *uchan) |
3357 | { | |
3358 | int ret = 0; | |
bec39940 DG |
3359 | struct lttng_ht_iter iter, uiter; |
3360 | struct lttng_ht_node_str *ua_chan_node; | |
9730260e DG |
3361 | struct ust_app *app; |
3362 | struct ust_app_session *ua_sess; | |
3363 | struct ust_app_channel *ua_chan; | |
3364 | struct ust_app_event *ua_event; | |
3365 | ||
3366 | DBG("UST app disabling all event for all apps in channel " | |
a991f516 | 3367 | "%s for session id %d", uchan->name, usess->id); |
9730260e DG |
3368 | |
3369 | rcu_read_lock(); | |
3370 | ||
3371 | /* For all registered applications */ | |
852d0037 | 3372 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3373 | if (!app->compatible) { |
3374 | /* | |
3375 | * TODO: In time, we should notice the caller of this error by | |
3376 | * telling him that this is a version error. | |
3377 | */ | |
3378 | continue; | |
3379 | } | |
9730260e | 3380 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3381 | if (!ua_sess) { |
3382 | /* The application has problem or is probably dead. */ | |
3383 | continue; | |
3384 | } | |
9730260e DG |
3385 | |
3386 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3387 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3388 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3389 | /* If the channel is not found, there is a code flow error */ |
3390 | assert(ua_chan_node); | |
3391 | ||
9730260e DG |
3392 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3393 | ||
3394 | /* Disable each events of channel */ | |
bec39940 DG |
3395 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
3396 | node.node) { | |
7f79d3a1 | 3397 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
9730260e DG |
3398 | if (ret < 0) { |
3399 | /* XXX: Report error someday... */ | |
3400 | continue; | |
3401 | } | |
3402 | } | |
3403 | } | |
3404 | ||
3405 | rcu_read_unlock(); | |
3406 | ||
3407 | return ret; | |
3408 | } | |
3409 | ||
421cb601 | 3410 | /* |
5b4a0ec0 | 3411 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 3412 | */ |
35a9059d | 3413 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3414 | struct ltt_ust_channel *uchan) |
3415 | { | |
3d8ca23b | 3416 | int ret = 0, created; |
bec39940 | 3417 | struct lttng_ht_iter iter; |
48842b30 | 3418 | struct ust_app *app; |
3d8ca23b | 3419 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 3420 | |
fc34caaa DG |
3421 | /* Very wrong code flow */ |
3422 | assert(usess); | |
3423 | assert(uchan); | |
421cb601 | 3424 | |
7972aab2 | 3425 | DBG2("UST app adding channel %s to UST domain for session id %d", |
a991f516 | 3426 | uchan->name, usess->id); |
48842b30 DG |
3427 | |
3428 | rcu_read_lock(); | |
421cb601 | 3429 | |
5b4a0ec0 | 3430 | /* For every registered applications */ |
852d0037 | 3431 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3432 | if (!app->compatible) { |
3433 | /* | |
3434 | * TODO: In time, we should notice the caller of this error by | |
3435 | * telling him that this is a version error. | |
3436 | */ | |
3437 | continue; | |
3438 | } | |
edb67388 DG |
3439 | /* |
3440 | * Create session on the tracer side and add it to app session HT. Note | |
3441 | * that if session exist, it will simply return a pointer to the ust | |
3442 | * app session. | |
3443 | */ | |
3d8ca23b DG |
3444 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
3445 | if (ret < 0) { | |
3446 | switch (ret) { | |
3447 | case -ENOTCONN: | |
3448 | /* | |
3449 | * The application's socket is not valid. Either a bad socket | |
3450 | * or a timeout on it. We can't inform the caller that for a | |
3451 | * specific app, the session failed so lets continue here. | |
3452 | */ | |
3453 | continue; | |
3454 | case -ENOMEM: | |
3455 | default: | |
3456 | goto error_rcu_unlock; | |
3457 | } | |
48842b30 | 3458 | } |
3d8ca23b | 3459 | assert(ua_sess); |
48842b30 | 3460 | |
d0b96690 | 3461 | pthread_mutex_lock(&ua_sess->lock); |
d65d2de8 DG |
3462 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
3463 | sizeof(uchan->name))) { | |
3464 | struct ustctl_consumer_channel_attr attr; | |
3465 | copy_channel_attr_to_ustctl(&attr, &uchan->attr); | |
3466 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
3467 | &attr); | |
3468 | } else { | |
3469 | /* Create channel onto application. We don't need the chan ref. */ | |
3470 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
3471 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
3472 | } | |
d0b96690 | 3473 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b DG |
3474 | if (ret < 0) { |
3475 | if (ret == -ENOMEM) { | |
3476 | /* No more memory is a fatal error. Stop right now. */ | |
3477 | goto error_rcu_unlock; | |
3478 | } | |
3479 | /* Cleanup the created session if it's the case. */ | |
3480 | if (created) { | |
d0b96690 | 3481 | destroy_app_session(app, ua_sess); |
3d8ca23b | 3482 | } |
48842b30 | 3483 | } |
48842b30 | 3484 | } |
5b4a0ec0 | 3485 | |
95e047ff | 3486 | error_rcu_unlock: |
48842b30 | 3487 | rcu_read_unlock(); |
3c14c33f | 3488 | return ret; |
48842b30 DG |
3489 | } |
3490 | ||
5b4a0ec0 | 3491 | /* |
edb67388 | 3492 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 3493 | */ |
35a9059d | 3494 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
3495 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3496 | { | |
3497 | int ret = 0; | |
bec39940 | 3498 | struct lttng_ht_iter iter, uiter; |
18eace3b | 3499 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
3500 | struct ust_app *app; |
3501 | struct ust_app_session *ua_sess; | |
3502 | struct ust_app_channel *ua_chan; | |
3503 | struct ust_app_event *ua_event; | |
48842b30 | 3504 | |
a991f516 MD |
3505 | DBG("UST app enabling event %s for all apps for session id %d", |
3506 | uevent->attr.name, usess->id); | |
48842b30 | 3507 | |
edb67388 DG |
3508 | /* |
3509 | * NOTE: At this point, this function is called only if the session and | |
3510 | * channel passed are already created for all apps. and enabled on the | |
3511 | * tracer also. | |
3512 | */ | |
3513 | ||
48842b30 | 3514 | rcu_read_lock(); |
421cb601 DG |
3515 | |
3516 | /* For all registered applications */ | |
852d0037 | 3517 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3518 | if (!app->compatible) { |
3519 | /* | |
3520 | * TODO: In time, we should notice the caller of this error by | |
3521 | * telling him that this is a version error. | |
3522 | */ | |
3523 | continue; | |
3524 | } | |
edb67388 | 3525 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3526 | if (!ua_sess) { |
3527 | /* The application has problem or is probably dead. */ | |
3528 | continue; | |
3529 | } | |
ba767faf | 3530 | |
d0b96690 DG |
3531 | pthread_mutex_lock(&ua_sess->lock); |
3532 | ||
edb67388 | 3533 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3534 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3535 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3536 | /* If the channel is not found, there is a code flow error */ |
3537 | assert(ua_chan_node); | |
3538 | ||
3539 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3540 | ||
18eace3b DG |
3541 | /* Get event node */ |
3542 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
3543 | uevent->filter, uevent->attr.loglevel); | |
3544 | if (ua_event == NULL) { | |
7f79d3a1 | 3545 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 3546 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 3547 | goto next_app; |
35a9059d | 3548 | } |
35a9059d DG |
3549 | |
3550 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
3551 | if (ret < 0) { | |
d0b96690 | 3552 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 3553 | goto error; |
48842b30 | 3554 | } |
d0b96690 DG |
3555 | next_app: |
3556 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
3557 | } |
3558 | ||
7f79d3a1 | 3559 | error: |
edb67388 | 3560 | rcu_read_unlock(); |
edb67388 DG |
3561 | return ret; |
3562 | } | |
3563 | ||
3564 | /* | |
3565 | * For a specific existing UST session and UST channel, creates the event for | |
3566 | * all registered apps. | |
3567 | */ | |
35a9059d | 3568 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
3569 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
3570 | { | |
3571 | int ret = 0; | |
bec39940 DG |
3572 | struct lttng_ht_iter iter, uiter; |
3573 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
3574 | struct ust_app *app; |
3575 | struct ust_app_session *ua_sess; | |
3576 | struct ust_app_channel *ua_chan; | |
3577 | ||
a991f516 MD |
3578 | DBG("UST app creating event %s for all apps for session id %d", |
3579 | uevent->attr.name, usess->id); | |
edb67388 | 3580 | |
edb67388 DG |
3581 | rcu_read_lock(); |
3582 | ||
3583 | /* For all registered applications */ | |
852d0037 | 3584 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3585 | if (!app->compatible) { |
3586 | /* | |
3587 | * TODO: In time, we should notice the caller of this error by | |
3588 | * telling him that this is a version error. | |
3589 | */ | |
3590 | continue; | |
3591 | } | |
edb67388 | 3592 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
3593 | if (!ua_sess) { |
3594 | /* The application has problem or is probably dead. */ | |
3595 | continue; | |
3596 | } | |
48842b30 | 3597 | |
d0b96690 | 3598 | pthread_mutex_lock(&ua_sess->lock); |
48842b30 | 3599 | /* Lookup channel in the ust app session */ |
bec39940 DG |
3600 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3601 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
3602 | /* If the channel is not found, there is a code flow error */ |
3603 | assert(ua_chan_node); | |
3604 | ||
48842b30 DG |
3605 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
3606 | ||
edb67388 | 3607 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 3608 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 3609 | if (ret < 0) { |
49c336c1 | 3610 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
3611 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
3612 | break; | |
3613 | } | |
3614 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 3615 | uevent->attr.name, app->pid); |
5b4a0ec0 | 3616 | continue; |
48842b30 | 3617 | } |
48842b30 | 3618 | } |
5b4a0ec0 | 3619 | |
48842b30 DG |
3620 | rcu_read_unlock(); |
3621 | ||
3622 | return ret; | |
3623 | } | |
3624 | ||
5b4a0ec0 DG |
3625 | /* |
3626 | * Start tracing for a specific UST session and app. | |
3627 | */ | |
b34cbebf | 3628 | static |
421cb601 | 3629 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
3630 | { |
3631 | int ret = 0; | |
48842b30 | 3632 | struct ust_app_session *ua_sess; |
48842b30 | 3633 | |
852d0037 | 3634 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 3635 | |
509cbaf8 MD |
3636 | rcu_read_lock(); |
3637 | ||
e0c7ec2b DG |
3638 | if (!app->compatible) { |
3639 | goto end; | |
3640 | } | |
3641 | ||
421cb601 DG |
3642 | ua_sess = lookup_session_by_app(usess, app); |
3643 | if (ua_sess == NULL) { | |
d42f20df DG |
3644 | /* The session is in teardown process. Ignore and continue. */ |
3645 | goto end; | |
421cb601 | 3646 | } |
48842b30 | 3647 | |
d0b96690 DG |
3648 | pthread_mutex_lock(&ua_sess->lock); |
3649 | ||
aea829b3 DG |
3650 | /* Upon restart, we skip the setup, already done */ |
3651 | if (ua_sess->started) { | |
8be98f9a | 3652 | goto skip_setup; |
aea829b3 | 3653 | } |
8be98f9a | 3654 | |
a4b92340 DG |
3655 | /* Create directories if consumer is LOCAL and has a path defined. */ |
3656 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
3657 | strlen(usess->consumer->dst.trace_path) > 0) { | |
3658 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 3659 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 DG |
3660 | if (ret < 0) { |
3661 | if (ret != -EEXIST) { | |
3662 | ERR("Trace directory creation error"); | |
d0b96690 | 3663 | goto error_unlock; |
421cb601 | 3664 | } |
173af62f | 3665 | } |
7753dea8 | 3666 | } |
aea829b3 | 3667 | |
d65d2de8 DG |
3668 | /* |
3669 | * Create the metadata for the application. This returns gracefully if a | |
3670 | * metadata was already set for the session. | |
3671 | */ | |
3672 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, NULL); | |
421cb601 | 3673 | if (ret < 0) { |
d0b96690 | 3674 | goto error_unlock; |
421cb601 | 3675 | } |
48842b30 | 3676 | |
840cb59c | 3677 | health_code_update(); |
86acf0da | 3678 | |
8be98f9a | 3679 | skip_setup: |
421cb601 | 3680 | /* This start the UST tracing */ |
852d0037 | 3681 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
421cb601 | 3682 | if (ret < 0) { |
ffe60014 DG |
3683 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3684 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
3685 | app->pid, ret); | |
3686 | } else { | |
3687 | DBG("UST app start session failed. Application is dead."); | |
3688 | } | |
d0b96690 | 3689 | goto error_unlock; |
421cb601 | 3690 | } |
5b4a0ec0 | 3691 | |
55c3953d DG |
3692 | /* Indicate that the session has been started once */ |
3693 | ua_sess->started = 1; | |
3694 | ||
d0b96690 DG |
3695 | pthread_mutex_unlock(&ua_sess->lock); |
3696 | ||
840cb59c | 3697 | health_code_update(); |
86acf0da | 3698 | |
421cb601 | 3699 | /* Quiescent wait after starting trace */ |
ffe60014 DG |
3700 | ret = ustctl_wait_quiescent(app->sock); |
3701 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3702 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3703 | app->pid, ret); | |
3704 | } | |
48842b30 | 3705 | |
e0c7ec2b DG |
3706 | end: |
3707 | rcu_read_unlock(); | |
840cb59c | 3708 | health_code_update(); |
421cb601 | 3709 | return 0; |
48842b30 | 3710 | |
d0b96690 DG |
3711 | error_unlock: |
3712 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 3713 | rcu_read_unlock(); |
840cb59c | 3714 | health_code_update(); |
421cb601 DG |
3715 | return -1; |
3716 | } | |
48842b30 | 3717 | |
8be98f9a MD |
3718 | /* |
3719 | * Stop tracing for a specific UST session and app. | |
3720 | */ | |
b34cbebf | 3721 | static |
8be98f9a MD |
3722 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
3723 | { | |
3724 | int ret = 0; | |
3725 | struct ust_app_session *ua_sess; | |
7972aab2 | 3726 | struct ust_registry_session *registry; |
8be98f9a | 3727 | |
852d0037 | 3728 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
3729 | |
3730 | rcu_read_lock(); | |
3731 | ||
e0c7ec2b | 3732 | if (!app->compatible) { |
d88aee68 | 3733 | goto end_no_session; |
e0c7ec2b DG |
3734 | } |
3735 | ||
8be98f9a MD |
3736 | ua_sess = lookup_session_by_app(usess, app); |
3737 | if (ua_sess == NULL) { | |
d88aee68 | 3738 | goto end_no_session; |
8be98f9a MD |
3739 | } |
3740 | ||
d88aee68 DG |
3741 | pthread_mutex_lock(&ua_sess->lock); |
3742 | ||
9bc07046 DG |
3743 | /* |
3744 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
3745 | * that was never started. It's possible since we can have a fail start |
3746 | * from either the application manager thread or the command thread. Simply | |
3747 | * indicate that this is a stop error. | |
9bc07046 | 3748 | */ |
f9dfc3d9 | 3749 | if (!ua_sess->started) { |
c45536e1 DG |
3750 | goto error_rcu_unlock; |
3751 | } | |
7db205b5 | 3752 | |
840cb59c | 3753 | health_code_update(); |
86acf0da | 3754 | |
9d6c7d3f | 3755 | /* This inhibits UST tracing */ |
852d0037 | 3756 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
9d6c7d3f | 3757 | if (ret < 0) { |
ffe60014 DG |
3758 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3759 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
3760 | app->pid, ret); | |
3761 | } else { | |
3762 | DBG("UST app stop session failed. Application is dead."); | |
3763 | } | |
9d6c7d3f DG |
3764 | goto error_rcu_unlock; |
3765 | } | |
3766 | ||
840cb59c | 3767 | health_code_update(); |
86acf0da | 3768 | |
9d6c7d3f | 3769 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3770 | ret = ustctl_wait_quiescent(app->sock); |
3771 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3772 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3773 | app->pid, ret); | |
3774 | } | |
9d6c7d3f | 3775 | |
840cb59c | 3776 | health_code_update(); |
86acf0da | 3777 | |
b34cbebf MD |
3778 | registry = get_session_registry(ua_sess); |
3779 | assert(registry); | |
1b532a60 DG |
3780 | |
3781 | if (!registry->metadata_closed) { | |
3782 | /* Push metadata for application before freeing the application. */ | |
3783 | (void) push_metadata(registry, ua_sess->consumer); | |
3784 | } | |
b34cbebf MD |
3785 | |
3786 | pthread_mutex_unlock(&ua_sess->lock); | |
3787 | end_no_session: | |
3788 | rcu_read_unlock(); | |
3789 | health_code_update(); | |
3790 | return 0; | |
3791 | ||
3792 | error_rcu_unlock: | |
3793 | pthread_mutex_unlock(&ua_sess->lock); | |
3794 | rcu_read_unlock(); | |
3795 | health_code_update(); | |
3796 | return -1; | |
3797 | } | |
3798 | ||
3799 | /* | |
3800 | * Flush buffers for a specific UST session and app. | |
3801 | */ | |
3802 | static | |
3803 | int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app) | |
3804 | { | |
3805 | int ret = 0; | |
3806 | struct lttng_ht_iter iter; | |
3807 | struct ust_app_session *ua_sess; | |
3808 | struct ust_app_channel *ua_chan; | |
3809 | ||
3810 | DBG("Flushing buffers for ust app pid %d", app->pid); | |
3811 | ||
3812 | rcu_read_lock(); | |
3813 | ||
3814 | if (!app->compatible) { | |
3815 | goto end_no_session; | |
3816 | } | |
3817 | ||
3818 | ua_sess = lookup_session_by_app(usess, app); | |
3819 | if (ua_sess == NULL) { | |
3820 | goto end_no_session; | |
3821 | } | |
3822 | ||
3823 | pthread_mutex_lock(&ua_sess->lock); | |
3824 | ||
3825 | health_code_update(); | |
3826 | ||
9d6c7d3f | 3827 | /* Flushing buffers */ |
bec39940 DG |
3828 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
3829 | node.node) { | |
840cb59c | 3830 | health_code_update(); |
ffe60014 | 3831 | assert(ua_chan->is_sent); |
852d0037 | 3832 | ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj); |
8be98f9a | 3833 | if (ret < 0) { |
ffe60014 DG |
3834 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3835 | ERR("UST app PID %d channel %s flush failed with ret %d", | |
3836 | app->pid, ua_chan->name, ret); | |
3837 | } else { | |
3838 | DBG3("UST app failed to flush %s. Application is dead.", | |
3839 | ua_chan->name); | |
3840 | /* No need to continue. */ | |
d88aee68 | 3841 | break; |
ffe60014 | 3842 | } |
6d3686da DG |
3843 | /* Continuing flushing all buffers */ |
3844 | continue; | |
8be98f9a MD |
3845 | } |
3846 | } | |
8be98f9a | 3847 | |
840cb59c | 3848 | health_code_update(); |
86acf0da | 3849 | |
d88aee68 DG |
3850 | pthread_mutex_unlock(&ua_sess->lock); |
3851 | end_no_session: | |
7db205b5 | 3852 | rcu_read_unlock(); |
840cb59c | 3853 | health_code_update(); |
8be98f9a | 3854 | return 0; |
8be98f9a MD |
3855 | } |
3856 | ||
84cd17c6 MD |
3857 | /* |
3858 | * Destroy a specific UST session in apps. | |
3859 | */ | |
3353de95 | 3860 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 3861 | { |
ffe60014 | 3862 | int ret; |
84cd17c6 | 3863 | struct ust_app_session *ua_sess; |
bec39940 DG |
3864 | struct lttng_ht_iter iter; |
3865 | struct lttng_ht_node_ulong *node; | |
84cd17c6 | 3866 | |
852d0037 | 3867 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
3868 | |
3869 | rcu_read_lock(); | |
3870 | ||
e0c7ec2b DG |
3871 | if (!app->compatible) { |
3872 | goto end; | |
3873 | } | |
3874 | ||
84cd17c6 | 3875 | __lookup_session_by_app(usess, app, &iter); |
bec39940 | 3876 | node = lttng_ht_iter_get_node_ulong(&iter); |
84cd17c6 | 3877 | if (node == NULL) { |
d42f20df DG |
3878 | /* Session is being or is deleted. */ |
3879 | goto end; | |
84cd17c6 MD |
3880 | } |
3881 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 3882 | |
840cb59c | 3883 | health_code_update(); |
d0b96690 | 3884 | destroy_app_session(app, ua_sess); |
84cd17c6 | 3885 | |
840cb59c | 3886 | health_code_update(); |
7db205b5 | 3887 | |
84cd17c6 | 3888 | /* Quiescent wait after stopping trace */ |
ffe60014 DG |
3889 | ret = ustctl_wait_quiescent(app->sock); |
3890 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
3891 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
3892 | app->pid, ret); | |
3893 | } | |
e0c7ec2b DG |
3894 | end: |
3895 | rcu_read_unlock(); | |
840cb59c | 3896 | health_code_update(); |
84cd17c6 | 3897 | return 0; |
84cd17c6 MD |
3898 | } |
3899 | ||
5b4a0ec0 DG |
3900 | /* |
3901 | * Start tracing for the UST session. | |
3902 | */ | |
421cb601 DG |
3903 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
3904 | { | |
3905 | int ret = 0; | |
bec39940 | 3906 | struct lttng_ht_iter iter; |
421cb601 | 3907 | struct ust_app *app; |
48842b30 | 3908 | |
421cb601 DG |
3909 | DBG("Starting all UST traces"); |
3910 | ||
3911 | rcu_read_lock(); | |
421cb601 | 3912 | |
852d0037 | 3913 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 3914 | ret = ust_app_start_trace(usess, app); |
48842b30 | 3915 | if (ret < 0) { |
5b4a0ec0 DG |
3916 | /* Continue to next apps even on error */ |
3917 | continue; | |
48842b30 | 3918 | } |
48842b30 | 3919 | } |
5b4a0ec0 | 3920 | |
48842b30 DG |
3921 | rcu_read_unlock(); |
3922 | ||
3923 | return 0; | |
3924 | } | |
487cf67c | 3925 | |
8be98f9a MD |
3926 | /* |
3927 | * Start tracing for the UST session. | |
3928 | */ | |
3929 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
3930 | { | |
3931 | int ret = 0; | |
bec39940 | 3932 | struct lttng_ht_iter iter; |
8be98f9a MD |
3933 | struct ust_app *app; |
3934 | ||
3935 | DBG("Stopping all UST traces"); | |
3936 | ||
3937 | rcu_read_lock(); | |
3938 | ||
b34cbebf MD |
3939 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3940 | ret = ust_app_stop_trace(usess, app); | |
3941 | if (ret < 0) { | |
3942 | /* Continue to next apps even on error */ | |
3943 | continue; | |
3944 | } | |
3945 | } | |
3946 | ||
3947 | /* Flush buffers */ | |
3948 | switch (usess->buffer_type) { | |
3949 | case LTTNG_BUFFER_PER_UID: | |
3950 | { | |
7972aab2 | 3951 | struct buffer_reg_uid *reg; |
b34cbebf MD |
3952 | |
3953 | /* Flush all per UID buffers associated to that session. */ | |
7972aab2 DG |
3954 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
3955 | struct buffer_reg_channel *reg_chan; | |
3956 | struct consumer_socket *socket; | |
3957 | ||
3958 | /* Get consumer socket to use to push the metadata.*/ | |
3959 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
3960 | usess->consumer); | |
3961 | if (!socket) { | |
3962 | /* Ignore request if no consumer is found for the session. */ | |
3963 | continue; | |
3964 | } | |
3965 | ||
3966 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
3967 | reg_chan, node.node) { | |
3968 | /* | |
3969 | * The following call will print error values so the return | |
3970 | * code is of little importance because whatever happens, we | |
3971 | * have to try them all. | |
3972 | */ | |
3973 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
3974 | } | |
3975 | } | |
b34cbebf | 3976 | break; |
7972aab2 | 3977 | } |
b34cbebf MD |
3978 | case LTTNG_BUFFER_PER_PID: |
3979 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3980 | ret = ust_app_flush_trace(usess, app); | |
3981 | if (ret < 0) { | |
3982 | /* Continue to next apps even on error */ | |
3983 | continue; | |
3984 | } | |
8be98f9a | 3985 | } |
b34cbebf MD |
3986 | break; |
3987 | default: | |
3988 | assert(0); | |
3989 | break; | |
8be98f9a MD |
3990 | } |
3991 | ||
3992 | rcu_read_unlock(); | |
3993 | ||
3994 | return 0; | |
3995 | } | |
3996 | ||
84cd17c6 MD |
3997 | /* |
3998 | * Destroy app UST session. | |
3999 | */ | |
4000 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4001 | { | |
4002 | int ret = 0; | |
bec39940 | 4003 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4004 | struct ust_app *app; |
4005 | ||
4006 | DBG("Destroy all UST traces"); | |
4007 | ||
4008 | rcu_read_lock(); | |
4009 | ||
852d0037 | 4010 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4011 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4012 | if (ret < 0) { |
4013 | /* Continue to next apps even on error */ | |
4014 | continue; | |
4015 | } | |
4016 | } | |
4017 | ||
4018 | rcu_read_unlock(); | |
4019 | ||
4020 | return 0; | |
4021 | } | |
4022 | ||
5b4a0ec0 DG |
4023 | /* |
4024 | * Add channels/events from UST global domain to registered apps at sock. | |
4025 | */ | |
487cf67c DG |
4026 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
4027 | { | |
55c54cce | 4028 | int ret = 0; |
727d5404 | 4029 | struct lttng_ht_iter iter, uiter, iter_ctx; |
487cf67c | 4030 | struct ust_app *app; |
3d8ca23b | 4031 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4032 | struct ust_app_channel *ua_chan; |
4033 | struct ust_app_event *ua_event; | |
727d5404 | 4034 | struct ust_app_ctx *ua_ctx; |
1f3580c7 | 4035 | |
95e047ff | 4036 | assert(usess); |
ffe60014 | 4037 | assert(sock >= 0); |
1f3580c7 | 4038 | |
a991f516 MD |
4039 | DBG2("UST app global update for app sock %d for session id %d", sock, |
4040 | usess->id); | |
487cf67c | 4041 | |
284d8f55 DG |
4042 | rcu_read_lock(); |
4043 | ||
487cf67c DG |
4044 | app = find_app_by_sock(sock); |
4045 | if (app == NULL) { | |
d88aee68 DG |
4046 | /* |
4047 | * Application can be unregistered before so this is possible hence | |
4048 | * simply stopping the update. | |
4049 | */ | |
4050 | DBG3("UST app update failed to find app sock %d", sock); | |
487cf67c DG |
4051 | goto error; |
4052 | } | |
4053 | ||
e0c7ec2b DG |
4054 | if (!app->compatible) { |
4055 | goto error; | |
4056 | } | |
4057 | ||
3d8ca23b DG |
4058 | ret = create_ust_app_session(usess, app, &ua_sess, NULL); |
4059 | if (ret < 0) { | |
4060 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4061 | goto error; |
4062 | } | |
3d8ca23b | 4063 | assert(ua_sess); |
487cf67c | 4064 | |
d0b96690 DG |
4065 | pthread_mutex_lock(&ua_sess->lock); |
4066 | ||
284d8f55 | 4067 | /* |
d0b96690 | 4068 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4069 | * app session above made a shadow copy of the UST global domain from the |
4070 | * ltt ust session. | |
4071 | */ | |
bec39940 DG |
4072 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4073 | node.node) { | |
d65d2de8 DG |
4074 | /* |
4075 | * For a metadata channel, handle it differently. | |
4076 | */ | |
4077 | if (!strncmp(ua_chan->name, DEFAULT_METADATA_NAME, | |
4078 | sizeof(ua_chan->name))) { | |
4079 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer, | |
4080 | &ua_chan->attr); | |
c7a339aa DG |
4081 | if (ret < 0) { |
4082 | goto error_unlock; | |
4083 | } | |
d65d2de8 DG |
4084 | /* Remove it from the hash table and continue!. */ |
4085 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
4086 | assert(!ret); | |
4087 | delete_ust_app_channel(-1, ua_chan, app); | |
4088 | continue; | |
4089 | } else { | |
4090 | ret = do_create_channel(app, usess, ua_sess, ua_chan); | |
c7a339aa DG |
4091 | if (ret < 0) { |
4092 | /* | |
4093 | * Stop everything. On error, the application failed, no more | |
4094 | * file descriptor are available or ENOMEM so stopping here is | |
4095 | * the only thing we can do for now. | |
4096 | */ | |
4097 | goto error_unlock; | |
4098 | } | |
487cf67c DG |
4099 | } |
4100 | ||
727d5404 DG |
4101 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx, |
4102 | node.node) { | |
4103 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
4104 | if (ret < 0) { | |
d0b96690 | 4105 | goto error_unlock; |
727d5404 DG |
4106 | } |
4107 | } | |
4108 | ||
4109 | ||
284d8f55 | 4110 | /* For each events */ |
bec39940 DG |
4111 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4112 | node.node) { | |
284d8f55 DG |
4113 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4114 | if (ret < 0) { | |
d0b96690 | 4115 | goto error_unlock; |
487cf67c | 4116 | } |
36dc12cc | 4117 | } |
487cf67c DG |
4118 | } |
4119 | ||
d0b96690 DG |
4120 | pthread_mutex_unlock(&ua_sess->lock); |
4121 | ||
36dc12cc | 4122 | if (usess->start_trace) { |
421cb601 | 4123 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4124 | if (ret < 0) { |
36dc12cc DG |
4125 | goto error; |
4126 | } | |
4127 | ||
852d0037 | 4128 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc DG |
4129 | } |
4130 | ||
ffe60014 DG |
4131 | /* Everything went well at this point. */ |
4132 | rcu_read_unlock(); | |
4133 | return; | |
4134 | ||
d0b96690 DG |
4135 | error_unlock: |
4136 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 4137 | error: |
ffe60014 | 4138 | if (ua_sess) { |
d0b96690 | 4139 | destroy_app_session(app, ua_sess); |
ffe60014 | 4140 | } |
487cf67c DG |
4141 | rcu_read_unlock(); |
4142 | return; | |
4143 | } | |
55cc08a6 DG |
4144 | |
4145 | /* | |
4146 | * Add context to a specific channel for global UST domain. | |
4147 | */ | |
4148 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
4149 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
4150 | { | |
4151 | int ret = 0; | |
bec39940 DG |
4152 | struct lttng_ht_node_str *ua_chan_node; |
4153 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
4154 | struct ust_app_channel *ua_chan = NULL; |
4155 | struct ust_app_session *ua_sess; | |
4156 | struct ust_app *app; | |
4157 | ||
4158 | rcu_read_lock(); | |
4159 | ||
852d0037 | 4160 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4161 | if (!app->compatible) { |
4162 | /* | |
4163 | * TODO: In time, we should notice the caller of this error by | |
4164 | * telling him that this is a version error. | |
4165 | */ | |
4166 | continue; | |
4167 | } | |
55cc08a6 DG |
4168 | ua_sess = lookup_session_by_app(usess, app); |
4169 | if (ua_sess == NULL) { | |
4170 | continue; | |
4171 | } | |
4172 | ||
d0b96690 | 4173 | pthread_mutex_lock(&ua_sess->lock); |
55cc08a6 | 4174 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4175 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4176 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 4177 | if (ua_chan_node == NULL) { |
d0b96690 | 4178 | goto next_app; |
55cc08a6 DG |
4179 | } |
4180 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
4181 | node); | |
55cc08a6 DG |
4182 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
4183 | if (ret < 0) { | |
d0b96690 | 4184 | goto next_app; |
55cc08a6 | 4185 | } |
d0b96690 DG |
4186 | next_app: |
4187 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
4188 | } |
4189 | ||
55cc08a6 DG |
4190 | rcu_read_unlock(); |
4191 | return ret; | |
4192 | } | |
4193 | ||
76d45b40 DG |
4194 | /* |
4195 | * Enable event for a channel from a UST session for a specific PID. | |
4196 | */ | |
4197 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
4198 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4199 | { | |
4200 | int ret = 0; | |
bec39940 | 4201 | struct lttng_ht_iter iter; |
18eace3b | 4202 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
4203 | struct ust_app *app; |
4204 | struct ust_app_session *ua_sess; | |
4205 | struct ust_app_channel *ua_chan; | |
4206 | struct ust_app_event *ua_event; | |
4207 | ||
4208 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
4209 | ||
4210 | rcu_read_lock(); | |
4211 | ||
4212 | app = ust_app_find_by_pid(pid); | |
4213 | if (app == NULL) { | |
4214 | ERR("UST app enable event per PID %d not found", pid); | |
4215 | ret = -1; | |
d0b96690 | 4216 | goto end; |
76d45b40 DG |
4217 | } |
4218 | ||
e0c7ec2b DG |
4219 | if (!app->compatible) { |
4220 | ret = 0; | |
d0b96690 | 4221 | goto end; |
e0c7ec2b DG |
4222 | } |
4223 | ||
76d45b40 | 4224 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4225 | if (!ua_sess) { |
4226 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
4227 | ret = 0; |
4228 | goto end; | |
c4a1715b | 4229 | } |
76d45b40 | 4230 | |
d0b96690 | 4231 | pthread_mutex_lock(&ua_sess->lock); |
76d45b40 | 4232 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4233 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4234 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
4235 | /* If the channel is not found, there is a code flow error */ |
4236 | assert(ua_chan_node); | |
4237 | ||
4238 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4239 | ||
18eace3b DG |
4240 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4241 | uevent->filter, uevent->attr.loglevel); | |
4242 | if (ua_event == NULL) { | |
76d45b40 DG |
4243 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
4244 | if (ret < 0) { | |
d0b96690 | 4245 | goto end_unlock; |
76d45b40 DG |
4246 | } |
4247 | } else { | |
76d45b40 DG |
4248 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
4249 | if (ret < 0) { | |
d0b96690 | 4250 | goto end_unlock; |
76d45b40 DG |
4251 | } |
4252 | } | |
4253 | ||
d0b96690 DG |
4254 | end_unlock: |
4255 | pthread_mutex_unlock(&ua_sess->lock); | |
4256 | end: | |
76d45b40 DG |
4257 | rcu_read_unlock(); |
4258 | return ret; | |
4259 | } | |
7f79d3a1 DG |
4260 | |
4261 | /* | |
4262 | * Disable event for a channel from a UST session for a specific PID. | |
4263 | */ | |
4264 | int ust_app_disable_event_pid(struct ltt_ust_session *usess, | |
4265 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
4266 | { | |
4267 | int ret = 0; | |
bec39940 DG |
4268 | struct lttng_ht_iter iter; |
4269 | struct lttng_ht_node_str *ua_chan_node, *ua_event_node; | |
7f79d3a1 DG |
4270 | struct ust_app *app; |
4271 | struct ust_app_session *ua_sess; | |
4272 | struct ust_app_channel *ua_chan; | |
4273 | struct ust_app_event *ua_event; | |
4274 | ||
4275 | DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid); | |
4276 | ||
4277 | rcu_read_lock(); | |
4278 | ||
4279 | app = ust_app_find_by_pid(pid); | |
4280 | if (app == NULL) { | |
4281 | ERR("UST app disable event per PID %d not found", pid); | |
4282 | ret = -1; | |
4283 | goto error; | |
4284 | } | |
4285 | ||
e0c7ec2b DG |
4286 | if (!app->compatible) { |
4287 | ret = 0; | |
4288 | goto error; | |
4289 | } | |
4290 | ||
7f79d3a1 | 4291 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4292 | if (!ua_sess) { |
4293 | /* The application has problem or is probably dead. */ | |
4294 | goto error; | |
4295 | } | |
7f79d3a1 DG |
4296 | |
4297 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4298 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
4299 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4300 | if (ua_chan_node == NULL) { |
4301 | /* Channel does not exist, skip disabling */ | |
4302 | goto error; | |
4303 | } | |
4304 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4305 | ||
bec39940 DG |
4306 | lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); |
4307 | ua_event_node = lttng_ht_iter_get_node_str(&iter); | |
7f79d3a1 DG |
4308 | if (ua_event_node == NULL) { |
4309 | /* Event does not exist, skip disabling */ | |
4310 | goto error; | |
4311 | } | |
4312 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); | |
4313 | ||
4314 | ret = disable_ust_app_event(ua_sess, ua_event, app); | |
4315 | if (ret < 0) { | |
4316 | goto error; | |
4317 | } | |
4318 | ||
4319 | error: | |
4320 | rcu_read_unlock(); | |
4321 | return ret; | |
4322 | } | |
e0c7ec2b | 4323 | |
4466912f DG |
4324 | /* |
4325 | * Calibrate registered applications. | |
4326 | */ | |
4327 | int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate) | |
4328 | { | |
4329 | int ret = 0; | |
4330 | struct lttng_ht_iter iter; | |
4331 | struct ust_app *app; | |
4332 | ||
4333 | rcu_read_lock(); | |
4334 | ||
852d0037 | 4335 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4466912f DG |
4336 | if (!app->compatible) { |
4337 | /* | |
4338 | * TODO: In time, we should notice the caller of this error by | |
4339 | * telling him that this is a version error. | |
4340 | */ | |
4341 | continue; | |
4342 | } | |
4343 | ||
840cb59c | 4344 | health_code_update(); |
86acf0da | 4345 | |
852d0037 | 4346 | ret = ustctl_calibrate(app->sock, calibrate); |
4466912f DG |
4347 | if (ret < 0) { |
4348 | switch (ret) { | |
4349 | case -ENOSYS: | |
4350 | /* Means that it's not implemented on the tracer side. */ | |
4351 | ret = 0; | |
4352 | break; | |
4353 | default: | |
4466912f | 4354 | DBG2("Calibrate app PID %d returned with error %d", |
852d0037 | 4355 | app->pid, ret); |
4466912f DG |
4356 | break; |
4357 | } | |
4358 | } | |
4359 | } | |
4360 | ||
4361 | DBG("UST app global domain calibration finished"); | |
4362 | ||
4363 | rcu_read_unlock(); | |
4364 | ||
840cb59c | 4365 | health_code_update(); |
86acf0da | 4366 | |
4466912f DG |
4367 | return ret; |
4368 | } | |
d0b96690 DG |
4369 | |
4370 | /* | |
4371 | * Receive registration and populate the given msg structure. | |
4372 | * | |
4373 | * On success return 0 else a negative value returned by the ustctl call. | |
4374 | */ | |
4375 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
4376 | { | |
4377 | int ret; | |
4378 | uint32_t pid, ppid, uid, gid; | |
4379 | ||
4380 | assert(msg); | |
4381 | ||
4382 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
4383 | &pid, &ppid, &uid, &gid, | |
4384 | &msg->bits_per_long, | |
4385 | &msg->uint8_t_alignment, | |
4386 | &msg->uint16_t_alignment, | |
4387 | &msg->uint32_t_alignment, | |
4388 | &msg->uint64_t_alignment, | |
4389 | &msg->long_alignment, | |
4390 | &msg->byte_order, | |
4391 | msg->name); | |
4392 | if (ret < 0) { | |
4393 | switch (-ret) { | |
4394 | case EPIPE: | |
4395 | case ECONNRESET: | |
4396 | case LTTNG_UST_ERR_EXITING: | |
4397 | DBG3("UST app recv reg message failed. Application died"); | |
4398 | break; | |
4399 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
4400 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
4401 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
4402 | LTTNG_UST_ABI_MINOR_VERSION); | |
4403 | break; | |
4404 | default: | |
4405 | ERR("UST app recv reg message failed with ret %d", ret); | |
4406 | break; | |
4407 | } | |
4408 | goto error; | |
4409 | } | |
4410 | msg->pid = (pid_t) pid; | |
4411 | msg->ppid = (pid_t) ppid; | |
4412 | msg->uid = (uid_t) uid; | |
4413 | msg->gid = (gid_t) gid; | |
4414 | ||
4415 | error: | |
4416 | return ret; | |
4417 | } | |
4418 | ||
d88aee68 DG |
4419 | /* |
4420 | * Return a ust app channel object using the application object and the channel | |
4421 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
4422 | * lock MUST be acquired before calling this function. | |
4423 | */ | |
d0b96690 DG |
4424 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
4425 | int objd) | |
4426 | { | |
4427 | struct lttng_ht_node_ulong *node; | |
4428 | struct lttng_ht_iter iter; | |
4429 | struct ust_app_channel *ua_chan = NULL; | |
4430 | ||
4431 | assert(app); | |
4432 | ||
4433 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
4434 | node = lttng_ht_iter_get_node_ulong(&iter); | |
4435 | if (node == NULL) { | |
4436 | DBG2("UST app channel find by objd %d not found", objd); | |
4437 | goto error; | |
4438 | } | |
4439 | ||
4440 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
4441 | ||
4442 | error: | |
4443 | return ua_chan; | |
4444 | } | |
4445 | ||
d88aee68 DG |
4446 | /* |
4447 | * Reply to a register channel notification from an application on the notify | |
4448 | * socket. The channel metadata is also created. | |
4449 | * | |
4450 | * The session UST registry lock is acquired in this function. | |
4451 | * | |
4452 | * On success 0 is returned else a negative value. | |
4453 | */ | |
d0b96690 DG |
4454 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
4455 | size_t nr_fields, struct ustctl_field *fields) | |
4456 | { | |
4457 | int ret, ret_code = 0; | |
4458 | uint32_t chan_id, reg_count; | |
7972aab2 | 4459 | uint64_t chan_reg_key; |
d0b96690 DG |
4460 | enum ustctl_channel_header type; |
4461 | struct ust_app *app; | |
4462 | struct ust_app_channel *ua_chan; | |
4463 | struct ust_app_session *ua_sess; | |
7972aab2 | 4464 | struct ust_registry_session *registry; |
45893984 | 4465 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
4466 | |
4467 | rcu_read_lock(); | |
4468 | ||
4469 | /* Lookup application. If not found, there is a code flow error. */ | |
4470 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4471 | if (!app) { |
4472 | DBG("Application socket %d is being teardown. Abort event notify", | |
4473 | sock); | |
4474 | ret = 0; | |
4475 | goto error_rcu_unlock; | |
4476 | } | |
d0b96690 DG |
4477 | |
4478 | /* Lookup channel by UST object descriptor. Should always be found. */ | |
4479 | ua_chan = find_channel_by_objd(app, cobjd); | |
4480 | assert(ua_chan); | |
4481 | assert(ua_chan->session); | |
4482 | ua_sess = ua_chan->session; | |
d0b96690 | 4483 | |
7972aab2 DG |
4484 | /* Get right session registry depending on the session buffer type. */ |
4485 | registry = get_session_registry(ua_sess); | |
4486 | assert(registry); | |
45893984 | 4487 | |
7972aab2 DG |
4488 | /* Depending on the buffer type, a different channel key is used. */ |
4489 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4490 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 4491 | } else { |
7972aab2 | 4492 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
4493 | } |
4494 | ||
7972aab2 DG |
4495 | pthread_mutex_lock(®istry->lock); |
4496 | ||
4497 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
4498 | assert(chan_reg); | |
4499 | ||
4500 | if (!chan_reg->register_done) { | |
4501 | reg_count = ust_registry_get_event_count(chan_reg); | |
4502 | if (reg_count < 31) { | |
4503 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
4504 | } else { | |
4505 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
4506 | } | |
4507 | ||
4508 | chan_reg->nr_ctx_fields = nr_fields; | |
4509 | chan_reg->ctx_fields = fields; | |
4510 | chan_reg->header_type = type; | |
d0b96690 | 4511 | } else { |
7972aab2 DG |
4512 | /* Get current already assigned values. */ |
4513 | type = chan_reg->header_type; | |
d0b96690 | 4514 | } |
7972aab2 DG |
4515 | /* Channel id is set during the object creation. */ |
4516 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
4517 | |
4518 | /* Append to metadata */ | |
7972aab2 DG |
4519 | if (!chan_reg->metadata_dumped) { |
4520 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
4521 | if (ret_code) { |
4522 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
4523 | goto reply; | |
4524 | } | |
4525 | } | |
4526 | ||
4527 | reply: | |
7972aab2 DG |
4528 | DBG3("UST app replying to register channel key %" PRIu64 |
4529 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
4530 | ret_code); | |
d0b96690 DG |
4531 | |
4532 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
4533 | if (ret < 0) { | |
4534 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4535 | ERR("UST app reply channel failed with ret %d", ret); | |
4536 | } else { | |
4537 | DBG3("UST app reply channel failed. Application died"); | |
4538 | } | |
4539 | goto error; | |
4540 | } | |
4541 | ||
7972aab2 DG |
4542 | /* This channel registry registration is completed. */ |
4543 | chan_reg->register_done = 1; | |
4544 | ||
d0b96690 | 4545 | error: |
7972aab2 | 4546 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4547 | error_rcu_unlock: |
d0b96690 DG |
4548 | rcu_read_unlock(); |
4549 | return ret; | |
4550 | } | |
4551 | ||
d88aee68 DG |
4552 | /* |
4553 | * Add event to the UST channel registry. When the event is added to the | |
4554 | * registry, the metadata is also created. Once done, this replies to the | |
4555 | * application with the appropriate error code. | |
4556 | * | |
4557 | * The session UST registry lock is acquired in the function. | |
4558 | * | |
4559 | * On success 0 is returned else a negative value. | |
4560 | */ | |
d0b96690 DG |
4561 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
4562 | char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel, | |
4563 | char *model_emf_uri) | |
4564 | { | |
4565 | int ret, ret_code; | |
4566 | uint32_t event_id = 0; | |
7972aab2 | 4567 | uint64_t chan_reg_key; |
d0b96690 DG |
4568 | struct ust_app *app; |
4569 | struct ust_app_channel *ua_chan; | |
4570 | struct ust_app_session *ua_sess; | |
7972aab2 | 4571 | struct ust_registry_session *registry; |
d0b96690 DG |
4572 | |
4573 | rcu_read_lock(); | |
4574 | ||
4575 | /* Lookup application. If not found, there is a code flow error. */ | |
4576 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
4577 | if (!app) { |
4578 | DBG("Application socket %d is being teardown. Abort event notify", | |
4579 | sock); | |
4580 | ret = 0; | |
4581 | goto error_rcu_unlock; | |
4582 | } | |
d0b96690 DG |
4583 | |
4584 | /* Lookup channel by UST object descriptor. Should always be found. */ | |
4585 | ua_chan = find_channel_by_objd(app, cobjd); | |
4586 | assert(ua_chan); | |
4587 | assert(ua_chan->session); | |
4588 | ua_sess = ua_chan->session; | |
4589 | ||
7972aab2 DG |
4590 | registry = get_session_registry(ua_sess); |
4591 | assert(registry); | |
4592 | ||
4593 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
4594 | chan_reg_key = ua_chan->tracing_channel_id; | |
4595 | } else { | |
4596 | chan_reg_key = ua_chan->key; | |
4597 | } | |
4598 | ||
4599 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 4600 | |
7972aab2 | 4601 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
45893984 | 4602 | sobjd, cobjd, name, sig, nr_fields, fields, loglevel, |
7972aab2 | 4603 | model_emf_uri, ua_sess->buffer_type, &event_id); |
d0b96690 DG |
4604 | |
4605 | /* | |
4606 | * The return value is returned to ustctl so in case of an error, the | |
4607 | * application can be notified. In case of an error, it's important not to | |
4608 | * return a negative error or else the application will get closed. | |
4609 | */ | |
4610 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
4611 | if (ret < 0) { | |
4612 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4613 | ERR("UST app reply event failed with ret %d", ret); | |
4614 | } else { | |
4615 | DBG3("UST app reply event failed. Application died"); | |
4616 | } | |
4617 | /* | |
4618 | * No need to wipe the create event since the application socket will | |
4619 | * get close on error hence cleaning up everything by itself. | |
4620 | */ | |
4621 | goto error; | |
4622 | } | |
4623 | ||
7972aab2 DG |
4624 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
4625 | name, event_id); | |
d88aee68 | 4626 | |
d0b96690 | 4627 | error: |
7972aab2 | 4628 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 4629 | error_rcu_unlock: |
d0b96690 DG |
4630 | rcu_read_unlock(); |
4631 | return ret; | |
4632 | } | |
4633 | ||
d88aee68 DG |
4634 | /* |
4635 | * Handle application notification through the given notify socket. | |
4636 | * | |
4637 | * Return 0 on success or else a negative value. | |
4638 | */ | |
d0b96690 DG |
4639 | int ust_app_recv_notify(int sock) |
4640 | { | |
4641 | int ret; | |
4642 | enum ustctl_notify_cmd cmd; | |
4643 | ||
4644 | DBG3("UST app receiving notify from sock %d", sock); | |
4645 | ||
4646 | ret = ustctl_recv_notify(sock, &cmd); | |
4647 | if (ret < 0) { | |
4648 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4649 | ERR("UST app recv notify failed with ret %d", ret); | |
4650 | } else { | |
4651 | DBG3("UST app recv notify failed. Application died"); | |
4652 | } | |
4653 | goto error; | |
4654 | } | |
4655 | ||
4656 | switch (cmd) { | |
4657 | case USTCTL_NOTIFY_CMD_EVENT: | |
4658 | { | |
4659 | int sobjd, cobjd, loglevel; | |
4660 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; | |
4661 | size_t nr_fields; | |
4662 | struct ustctl_field *fields; | |
4663 | ||
4664 | DBG2("UST app ustctl register event received"); | |
4665 | ||
4666 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel, | |
4667 | &sig, &nr_fields, &fields, &model_emf_uri); | |
4668 | if (ret < 0) { | |
4669 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4670 | ERR("UST app recv event failed with ret %d", ret); | |
4671 | } else { | |
4672 | DBG3("UST app recv event failed. Application died"); | |
4673 | } | |
4674 | goto error; | |
4675 | } | |
4676 | ||
4677 | /* Add event to the UST registry coming from the notify socket. */ | |
4678 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, | |
4679 | fields, loglevel, model_emf_uri); | |
4680 | if (ret < 0) { | |
4681 | goto error; | |
4682 | } | |
4683 | ||
4684 | break; | |
4685 | } | |
4686 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
4687 | { | |
4688 | int sobjd, cobjd; | |
4689 | size_t nr_fields; | |
4690 | struct ustctl_field *fields; | |
4691 | ||
4692 | DBG2("UST app ustctl register channel received"); | |
4693 | ||
4694 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
4695 | &fields); | |
4696 | if (ret < 0) { | |
4697 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
4698 | ERR("UST app recv channel failed with ret %d", ret); | |
4699 | } else { | |
4700 | DBG3("UST app recv channel failed. Application died"); | |
4701 | } | |
4702 | goto error; | |
4703 | } | |
4704 | ||
4705 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, | |
4706 | fields); | |
4707 | if (ret < 0) { | |
4708 | goto error; | |
4709 | } | |
4710 | ||
4711 | break; | |
4712 | } | |
4713 | default: | |
4714 | /* Should NEVER happen. */ | |
4715 | assert(0); | |
4716 | } | |
4717 | ||
4718 | error: | |
4719 | return ret; | |
4720 | } | |
d88aee68 DG |
4721 | |
4722 | /* | |
4723 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
4724 | * corresponding application. On failure, the call_rcu to close the socket is | |
4725 | * executed. If an application is found, it tries to delete it from the notify | |
4726 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
4727 | * | |
4728 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
4729 | * call RCU is not done but the rest of the cleanup is. | |
4730 | */ | |
4731 | void ust_app_notify_sock_unregister(int sock) | |
4732 | { | |
4733 | int err_enomem = 0; | |
4734 | struct lttng_ht_iter iter; | |
4735 | struct ust_app *app; | |
4736 | struct ust_app_notify_sock_obj *obj; | |
4737 | ||
4738 | assert(sock >= 0); | |
4739 | ||
4740 | rcu_read_lock(); | |
4741 | ||
4742 | obj = zmalloc(sizeof(*obj)); | |
4743 | if (!obj) { | |
4744 | /* | |
4745 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
4746 | * procedure but the call_rcu will not be called. In this case, we | |
4747 | * accept the fd leak rather than possibly creating an unsynchronized | |
4748 | * state between threads. | |
4749 | * | |
4750 | * TODO: The notify object should be created once the notify socket is | |
4751 | * registered and stored independantely from the ust app object. The | |
4752 | * tricky part is to synchronize the teardown of the application and | |
4753 | * this notify object. Let's keep that in mind so we can avoid this | |
4754 | * kind of shenanigans with ENOMEM in the teardown path. | |
4755 | */ | |
4756 | err_enomem = 1; | |
4757 | } else { | |
4758 | obj->fd = sock; | |
4759 | } | |
4760 | ||
4761 | DBG("UST app notify socket unregister %d", sock); | |
4762 | ||
4763 | /* | |
4764 | * Lookup application by notify socket. If this fails, this means that the | |
4765 | * hash table delete has already been done by the application | |
4766 | * unregistration process so we can safely close the notify socket in a | |
4767 | * call RCU. | |
4768 | */ | |
4769 | app = find_app_by_notify_sock(sock); | |
4770 | if (!app) { | |
4771 | goto close_socket; | |
4772 | } | |
4773 | ||
4774 | iter.iter.node = &app->notify_sock_n.node; | |
4775 | ||
4776 | /* | |
4777 | * Whatever happens here either we fail or succeed, in both cases we have | |
4778 | * to close the socket after a grace period to continue to the call RCU | |
4779 | * here. If the deletion is successful, the application is not visible | |
4780 | * anymore by other threads and is it fails it means that it was already | |
4781 | * deleted from the hash table so either way we just have to close the | |
4782 | * socket. | |
4783 | */ | |
4784 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4785 | ||
4786 | close_socket: | |
4787 | rcu_read_unlock(); | |
4788 | ||
4789 | /* | |
4790 | * Close socket after a grace period to avoid for the socket to be reused | |
4791 | * before the application object is freed creating potential race between | |
4792 | * threads trying to add unique in the global hash table. | |
4793 | */ | |
4794 | if (!err_enomem) { | |
4795 | call_rcu(&obj->head, close_notify_sock_rcu); | |
4796 | } | |
4797 | } |