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