Rename LTTng index in CTF index
[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.c
CommitLineData
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 *
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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.
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16 */
17
18#define _GNU_SOURCE
19#include <errno.h>
7972aab2 20#include <inttypes.h>
91d76f53
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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 36#include "fd-limit.h"
8782cc74 37#include "health-sessiond.h"
56fff090 38#include "ust-app.h"
48842b30 39#include "ust-consumer.h"
d80a6244 40#include "ust-ctl.h"
0b2dc8df 41#include "utils.h"
d80a6244 42
d9bf3ca4
MD
43/* Next available channel key. Access under next_channel_key_lock. */
44static uint64_t _next_channel_key;
45static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER;
46
47/* Next available session ID. Access under next_session_id_lock. */
48static uint64_t _next_session_id;
49static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER;
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50
51/*
d9bf3ca4 52 * Return the incremented value of next_channel_key.
ffe60014 53 */
d9bf3ca4 54static uint64_t get_next_channel_key(void)
ffe60014 55{
d9bf3ca4
MD
56 uint64_t ret;
57
58 pthread_mutex_lock(&next_channel_key_lock);
59 ret = ++_next_channel_key;
60 pthread_mutex_unlock(&next_channel_key_lock);
61 return ret;
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DG
62}
63
64/*
7972aab2 65 * Return the atomically incremented value of next_session_id.
ffe60014 66 */
d9bf3ca4 67static uint64_t get_next_session_id(void)
ffe60014 68{
d9bf3ca4
MD
69 uint64_t ret;
70
71 pthread_mutex_lock(&next_session_id_lock);
72 ret = ++_next_session_id;
73 pthread_mutex_unlock(&next_session_id_lock);
74 return ret;
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75}
76
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77static void copy_channel_attr_to_ustctl(
78 struct ustctl_consumer_channel_attr *attr,
79 struct lttng_ust_channel_attr *uattr)
80{
81 /* Copy event attributes since the layout is different. */
82 attr->subbuf_size = uattr->subbuf_size;
83 attr->num_subbuf = uattr->num_subbuf;
84 attr->overwrite = uattr->overwrite;
85 attr->switch_timer_interval = uattr->switch_timer_interval;
86 attr->read_timer_interval = uattr->read_timer_interval;
87 attr->output = uattr->output;
88}
89
025faf73
DG
90/*
91 * Match function for the hash table lookup.
92 *
93 * It matches an ust app event based on three attributes which are the event
94 * name, the filter bytecode and the loglevel.
95 */
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96static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key)
97{
98 struct ust_app_event *event;
99 const struct ust_app_ht_key *key;
100
101 assert(node);
102 assert(_key);
103
104 event = caa_container_of(node, struct ust_app_event, node.node);
105 key = _key;
106
1af53eb5 107 /* Match the 4 elements of the key: name, filter, loglevel, exclusions */
18eace3b
DG
108
109 /* Event name */
110 if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
111 goto no_match;
112 }
113
114 /* Event loglevel. */
115 if (event->attr.loglevel != key->loglevel) {
025faf73
DG
116 if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL
117 && key->loglevel == 0 && event->attr.loglevel == -1) {
118 /*
119 * Match is accepted. This is because on event creation, the
120 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
121 * -1 are accepted for this loglevel type since 0 is the one set by
122 * the API when receiving an enable event.
123 */
124 } else {
125 goto no_match;
126 }
18eace3b
DG
127 }
128
129 /* One of the filters is NULL, fail. */
130 if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
131 goto no_match;
132 }
133
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134 if (key->filter && event->filter) {
135 /* Both filters exists, check length followed by the bytecode. */
136 if (event->filter->len != key->filter->len ||
137 memcmp(event->filter->data, key->filter->data,
138 event->filter->len) != 0) {
139 goto no_match;
140 }
18eace3b
DG
141 }
142
1af53eb5
JI
143 /* One of the exclusions is NULL, fail. */
144 if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) {
145 goto no_match;
146 }
147
148 if (key->exclusion && event->exclusion) {
149 /* Both exclusions exists, check count followed by the names. */
150 if (event->exclusion->count != key->exclusion->count ||
151 memcmp(event->exclusion->names, key->exclusion->names,
152 event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) {
153 goto no_match;
154 }
155 }
156
157
025faf73 158 /* Match. */
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159 return 1;
160
161no_match:
162 return 0;
18eace3b
DG
163}
164
025faf73
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165/*
166 * Unique add of an ust app event in the given ht. This uses the custom
167 * ht_match_ust_app_event match function and the event name as hash.
168 */
d0b96690 169static void add_unique_ust_app_event(struct ust_app_channel *ua_chan,
18eace3b
DG
170 struct ust_app_event *event)
171{
172 struct cds_lfht_node *node_ptr;
173 struct ust_app_ht_key key;
d0b96690 174 struct lttng_ht *ht;
18eace3b 175
d0b96690
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176 assert(ua_chan);
177 assert(ua_chan->events);
18eace3b
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178 assert(event);
179
d0b96690 180 ht = ua_chan->events;
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181 key.name = event->attr.name;
182 key.filter = event->filter;
183 key.loglevel = event->attr.loglevel;
91c89f23 184 key.exclusion = event->exclusion;
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185
186 node_ptr = cds_lfht_add_unique(ht->ht,
187 ht->hash_fct(event->node.key, lttng_ht_seed),
188 ht_match_ust_app_event, &key, &event->node.node);
189 assert(node_ptr == &event->node.node);
190}
191
d88aee68
DG
192/*
193 * Close the notify socket from the given RCU head object. This MUST be called
194 * through a call_rcu().
195 */
196static void close_notify_sock_rcu(struct rcu_head *head)
197{
198 int ret;
199 struct ust_app_notify_sock_obj *obj =
200 caa_container_of(head, struct ust_app_notify_sock_obj, head);
201
202 /* Must have a valid fd here. */
203 assert(obj->fd >= 0);
204
205 ret = close(obj->fd);
206 if (ret) {
207 ERR("close notify sock %d RCU", obj->fd);
208 }
209 lttng_fd_put(LTTNG_FD_APPS, 1);
210
211 free(obj);
212}
213
7972aab2
DG
214/*
215 * Return the session registry according to the buffer type of the given
216 * session.
217 *
218 * A registry per UID object MUST exists before calling this function or else
219 * it assert() if not found. RCU read side lock must be acquired.
220 */
221static struct ust_registry_session *get_session_registry(
222 struct ust_app_session *ua_sess)
223{
224 struct ust_registry_session *registry = NULL;
225
226 assert(ua_sess);
227
228 switch (ua_sess->buffer_type) {
229 case LTTNG_BUFFER_PER_PID:
230 {
231 struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id);
232 if (!reg_pid) {
233 goto error;
234 }
235 registry = reg_pid->registry->reg.ust;
236 break;
237 }
238 case LTTNG_BUFFER_PER_UID:
239 {
240 struct buffer_reg_uid *reg_uid = buffer_reg_uid_find(
241 ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid);
242 if (!reg_uid) {
243 goto error;
244 }
245 registry = reg_uid->registry->reg.ust;
246 break;
247 }
248 default:
249 assert(0);
250 };
251
252error:
253 return registry;
254}
255
55cc08a6
DG
256/*
257 * Delete ust context safely. RCU read lock must be held before calling
258 * this function.
259 */
260static
261void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
262{
ffe60014
DG
263 int ret;
264
265 assert(ua_ctx);
266
55cc08a6 267 if (ua_ctx->obj) {
ffe60014 268 ret = ustctl_release_object(sock, ua_ctx->obj);
d0b96690
DG
269 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
270 ERR("UST app sock %d release ctx obj handle %d failed with ret %d",
271 sock, ua_ctx->obj->handle, ret);
ffe60014 272 }
55cc08a6
DG
273 free(ua_ctx->obj);
274 }
275 free(ua_ctx);
276}
277
d80a6244
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278/*
279 * Delete ust app event safely. RCU read lock must be held before calling
280 * this function.
281 */
8b366481
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282static
283void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
d80a6244 284{
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285 int ret;
286
287 assert(ua_event);
288
53a80697 289 free(ua_event->filter);
951f0b71
JI
290 if (ua_event->exclusion != NULL)
291 free(ua_event->exclusion);
edb67388 292 if (ua_event->obj != NULL) {
ffe60014
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293 ret = ustctl_release_object(sock, ua_event->obj);
294 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
295 ERR("UST app sock %d release event obj failed with ret %d",
296 sock, ret);
297 }
edb67388
DG
298 free(ua_event->obj);
299 }
d80a6244
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300 free(ua_event);
301}
302
303/*
7972aab2
DG
304 * Release ust data object of the given stream.
305 *
306 * Return 0 on success or else a negative value.
d80a6244 307 */
7972aab2 308static int release_ust_app_stream(int sock, struct ust_app_stream *stream)
d80a6244 309{
7972aab2 310 int ret = 0;
ffe60014
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311
312 assert(stream);
313
8b366481 314 if (stream->obj) {
ffe60014
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315 ret = ustctl_release_object(sock, stream->obj);
316 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
317 ERR("UST app sock %d release stream obj failed with ret %d",
318 sock, ret);
319 }
4063050c 320 lttng_fd_put(LTTNG_FD_APPS, 2);
8b366481
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321 free(stream->obj);
322 }
7972aab2
DG
323
324 return ret;
325}
326
327/*
328 * Delete ust app stream safely. RCU read lock must be held before calling
329 * this function.
330 */
331static
332void delete_ust_app_stream(int sock, struct ust_app_stream *stream)
333{
334 assert(stream);
335
336 (void) release_ust_app_stream(sock, stream);
84cd17c6 337 free(stream);
d80a6244
DG
338}
339
36b588ed
MD
340/*
341 * We need to execute ht_destroy outside of RCU read-side critical
0b2dc8df
MD
342 * section and outside of call_rcu thread, so we postpone its execution
343 * using ht_cleanup_push. It is simpler than to change the semantic of
344 * the many callers of delete_ust_app_session().
36b588ed
MD
345 */
346static
347void delete_ust_app_channel_rcu(struct rcu_head *head)
348{
349 struct ust_app_channel *ua_chan =
350 caa_container_of(head, struct ust_app_channel, rcu_head);
351
0b2dc8df
MD
352 ht_cleanup_push(ua_chan->ctx);
353 ht_cleanup_push(ua_chan->events);
36b588ed
MD
354 free(ua_chan);
355}
356
d80a6244
DG
357/*
358 * Delete ust app channel safely. RCU read lock must be held before calling
359 * this function.
360 */
8b366481 361static
d0b96690
DG
362void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan,
363 struct ust_app *app)
d80a6244
DG
364{
365 int ret;
bec39940 366 struct lttng_ht_iter iter;
d80a6244 367 struct ust_app_event *ua_event;
55cc08a6 368 struct ust_app_ctx *ua_ctx;
030a66fa 369 struct ust_app_stream *stream, *stmp;
7972aab2 370 struct ust_registry_session *registry;
d80a6244 371
ffe60014
DG
372 assert(ua_chan);
373
374 DBG3("UST app deleting channel %s", ua_chan->name);
375
55cc08a6 376 /* Wipe stream */
d80a6244 377 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
84cd17c6 378 cds_list_del(&stream->list);
d80a6244
DG
379 delete_ust_app_stream(sock, stream);
380 }
381
55cc08a6 382 /* Wipe context */
bec39940 383 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
31746f93 384 cds_list_del(&ua_ctx->list);
bec39940 385 ret = lttng_ht_del(ua_chan->ctx, &iter);
55cc08a6
DG
386 assert(!ret);
387 delete_ust_app_ctx(sock, ua_ctx);
388 }
d80a6244 389
55cc08a6 390 /* Wipe events */
bec39940
DG
391 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
392 node.node) {
393 ret = lttng_ht_del(ua_chan->events, &iter);
525b0740 394 assert(!ret);
d80a6244
DG
395 delete_ust_app_event(sock, ua_event);
396 }
edb67388 397
c8335706
MD
398 if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) {
399 /* Wipe and free registry from session registry. */
400 registry = get_session_registry(ua_chan->session);
401 if (registry) {
402 ust_registry_channel_del_free(registry, ua_chan->key);
403 }
7972aab2 404 }
d0b96690 405
edb67388 406 if (ua_chan->obj != NULL) {
d0b96690
DG
407 /* Remove channel from application UST object descriptor. */
408 iter.iter.node = &ua_chan->ust_objd_node.node;
409 lttng_ht_del(app->ust_objd, &iter);
ffe60014
DG
410 ret = ustctl_release_object(sock, ua_chan->obj);
411 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
412 ERR("UST app sock %d release channel obj failed with ret %d",
413 sock, ret);
414 }
7972aab2 415 lttng_fd_put(LTTNG_FD_APPS, 1);
edb67388
DG
416 free(ua_chan->obj);
417 }
36b588ed 418 call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu);
d80a6244
DG
419}
420
331744e3 421/*
1b532a60
DG
422 * Push metadata to consumer socket.
423 *
424 * The socket lock MUST be acquired.
425 * The ust app session lock MUST be acquired.
331744e3
JD
426 *
427 * On success, return the len of metadata pushed or else a negative value.
428 */
429ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
430 struct consumer_socket *socket, int send_zero_data)
431{
432 int ret;
433 char *metadata_str = NULL;
434 size_t len, offset;
435 ssize_t ret_val;
436
437 assert(registry);
438 assert(socket);
1b532a60
DG
439
440 /*
441 * On a push metadata error either the consumer is dead or the metadata
442 * channel has been destroyed because its endpoint might have died (e.g:
443 * relayd). If so, the metadata closed flag is set to 1 so we deny pushing
444 * metadata again which is not valid anymore on the consumer side.
445 *
446 * The ust app session mutex locked allows us to make this check without
447 * the registry lock.
448 */
449 if (registry->metadata_closed) {
450 return -EPIPE;
451 }
331744e3
JD
452
453 pthread_mutex_lock(&registry->lock);
454
455 offset = registry->metadata_len_sent;
456 len = registry->metadata_len - registry->metadata_len_sent;
457 if (len == 0) {
458 DBG3("No metadata to push for metadata key %" PRIu64,
459 registry->metadata_key);
460 ret_val = len;
461 if (send_zero_data) {
462 DBG("No metadata to push");
463 goto push_data;
464 }
465 goto end;
466 }
467
468 /* Allocate only what we have to send. */
469 metadata_str = zmalloc(len);
470 if (!metadata_str) {
471 PERROR("zmalloc ust app metadata string");
472 ret_val = -ENOMEM;
473 goto error;
474 }
475 /* Copy what we haven't send out. */
476 memcpy(metadata_str, registry->metadata + offset, len);
477 registry->metadata_len_sent += len;
478
479push_data:
480 pthread_mutex_unlock(&registry->lock);
481 ret = consumer_push_metadata(socket, registry->metadata_key,
482 metadata_str, len, offset);
483 if (ret < 0) {
484 ret_val = ret;
485 goto error_push;
486 }
487
488 free(metadata_str);
489 return len;
490
491end:
492error:
493 pthread_mutex_unlock(&registry->lock);
494error_push:
495 free(metadata_str);
496 return ret_val;
497}
498
d88aee68
DG
499/*
500 * For a given application and session, push metadata to consumer. The session
501 * lock MUST be acquired here before calling this.
331744e3
JD
502 * Either sock or consumer is required : if sock is NULL, the default
503 * socket to send the metadata is retrieved from consumer, if sock
504 * is not NULL we use it to send the metadata.
d88aee68
DG
505 *
506 * Return 0 on success else a negative error.
507 */
7972aab2
DG
508static int push_metadata(struct ust_registry_session *registry,
509 struct consumer_output *consumer)
d88aee68 510{
331744e3
JD
511 int ret_val;
512 ssize_t ret;
d88aee68
DG
513 struct consumer_socket *socket;
514
7972aab2
DG
515 assert(registry);
516 assert(consumer);
517
518 rcu_read_lock();
d88aee68 519
7972aab2
DG
520 /*
521 * Means that no metadata was assigned to the session. This can happens if
522 * no start has been done previously.
523 */
524 if (!registry->metadata_key) {
331744e3 525 ret_val = 0;
1b532a60 526 goto end_rcu_unlock;
d88aee68
DG
527 }
528
d88aee68 529 /* Get consumer socket to use to push the metadata.*/
7972aab2
DG
530 socket = consumer_find_socket_by_bitness(registry->bits_per_long,
531 consumer);
d88aee68 532 if (!socket) {
331744e3 533 ret_val = -1;
d88aee68
DG
534 goto error_rcu_unlock;
535 }
536
537 /*
538 * TODO: Currently, we hold the socket lock around sampling of the next
539 * metadata segment to ensure we send metadata over the consumer socket in
540 * the correct order. This makes the registry lock nest inside the socket
541 * lock.
542 *
543 * Please note that this is a temporary measure: we should move this lock
544 * back into ust_consumer_push_metadata() when the consumer gets the
545 * ability to reorder the metadata it receives.
546 */
547 pthread_mutex_lock(socket->lock);
331744e3
JD
548 ret = ust_app_push_metadata(registry, socket, 0);
549 pthread_mutex_unlock(socket->lock);
d88aee68 550 if (ret < 0) {
331744e3 551 ret_val = ret;
d88aee68
DG
552 goto error_rcu_unlock;
553 }
554
d88aee68 555 rcu_read_unlock();
d88aee68
DG
556 return 0;
557
d88aee68 558error_rcu_unlock:
1b532a60
DG
559 /*
560 * On error, flag the registry that the metadata is closed. We were unable
561 * to push anything and this means that either the consumer is not
562 * responding or the metadata cache has been destroyed on the consumer.
563 */
564 registry->metadata_closed = 1;
565end_rcu_unlock:
d88aee68 566 rcu_read_unlock();
331744e3 567 return ret_val;
d88aee68
DG
568}
569
570/*
571 * Send to the consumer a close metadata command for the given session. Once
572 * done, the metadata channel is deleted and the session metadata pointer is
573 * nullified. The session lock MUST be acquired here unless the application is
574 * in the destroy path.
575 *
576 * Return 0 on success else a negative value.
577 */
7972aab2
DG
578static int close_metadata(struct ust_registry_session *registry,
579 struct consumer_output *consumer)
d88aee68
DG
580{
581 int ret;
582 struct consumer_socket *socket;
583
7972aab2
DG
584 assert(registry);
585 assert(consumer);
d88aee68 586
7972aab2
DG
587 rcu_read_lock();
588
589 if (!registry->metadata_key || registry->metadata_closed) {
d88aee68 590 ret = 0;
1b532a60 591 goto end;
d88aee68
DG
592 }
593
d88aee68 594 /* Get consumer socket to use to push the metadata.*/
7972aab2
DG
595 socket = consumer_find_socket_by_bitness(registry->bits_per_long,
596 consumer);
d88aee68
DG
597 if (!socket) {
598 ret = -1;
7972aab2 599 goto error;
d88aee68
DG
600 }
601
7972aab2 602 ret = consumer_close_metadata(socket, registry->metadata_key);
d88aee68 603 if (ret < 0) {
7972aab2 604 goto error;
d88aee68
DG
605 }
606
d88aee68 607error:
1b532a60
DG
608 /*
609 * Metadata closed. Even on error this means that the consumer is not
610 * responding or not found so either way a second close should NOT be emit
611 * for this registry.
612 */
613 registry->metadata_closed = 1;
614end:
7972aab2 615 rcu_read_unlock();
d88aee68
DG
616 return ret;
617}
618
36b588ed
MD
619/*
620 * We need to execute ht_destroy outside of RCU read-side critical
0b2dc8df
MD
621 * section and outside of call_rcu thread, so we postpone its execution
622 * using ht_cleanup_push. It is simpler than to change the semantic of
623 * the many callers of delete_ust_app_session().
36b588ed
MD
624 */
625static
626void delete_ust_app_session_rcu(struct rcu_head *head)
627{
628 struct ust_app_session *ua_sess =
629 caa_container_of(head, struct ust_app_session, rcu_head);
630
0b2dc8df 631 ht_cleanup_push(ua_sess->channels);
36b588ed
MD
632 free(ua_sess);
633}
634
d80a6244
DG
635/*
636 * Delete ust app session safely. RCU read lock must be held before calling
637 * this function.
638 */
8b366481 639static
d0b96690
DG
640void delete_ust_app_session(int sock, struct ust_app_session *ua_sess,
641 struct ust_app *app)
d80a6244
DG
642{
643 int ret;
bec39940 644 struct lttng_ht_iter iter;
d80a6244 645 struct ust_app_channel *ua_chan;
7972aab2 646 struct ust_registry_session *registry;
d80a6244 647
d88aee68
DG
648 assert(ua_sess);
649
1b532a60
DG
650 pthread_mutex_lock(&ua_sess->lock);
651
7972aab2 652 registry = get_session_registry(ua_sess);
1b532a60 653 if (registry && !registry->metadata_closed) {
d88aee68 654 /* Push metadata for application before freeing the application. */
7972aab2 655 (void) push_metadata(registry, ua_sess->consumer);
d88aee68 656
7972aab2
DG
657 /*
658 * Don't ask to close metadata for global per UID buffers. Close
1b532a60
DG
659 * metadata only on destroy trace session in this case. Also, the
660 * previous push metadata could have flag the metadata registry to
661 * close so don't send a close command if closed.
7972aab2 662 */
1b532a60
DG
663 if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID &&
664 !registry->metadata_closed) {
7972aab2
DG
665 /* And ask to close it for this session registry. */
666 (void) close_metadata(registry, ua_sess->consumer);
667 }
d80a6244
DG
668 }
669
bec39940
DG
670 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
671 node.node) {
672 ret = lttng_ht_del(ua_sess->channels, &iter);
525b0740 673 assert(!ret);
d0b96690 674 delete_ust_app_channel(sock, ua_chan, app);
d80a6244 675 }
d80a6244 676
7972aab2
DG
677 /* In case of per PID, the registry is kept in the session. */
678 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) {
679 struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id);
680 if (reg_pid) {
681 buffer_reg_pid_remove(reg_pid);
682 buffer_reg_pid_destroy(reg_pid);
683 }
684 }
d0b96690 685
aee6bafd 686 if (ua_sess->handle != -1) {
ffe60014
DG
687 ret = ustctl_release_handle(sock, ua_sess->handle);
688 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
689 ERR("UST app sock %d release session handle failed with ret %d",
690 sock, ret);
691 }
aee6bafd 692 }
1b532a60
DG
693 pthread_mutex_unlock(&ua_sess->lock);
694
36b588ed 695 call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu);
d80a6244 696}
91d76f53
DG
697
698/*
284d8f55
DG
699 * Delete a traceable application structure from the global list. Never call
700 * this function outside of a call_rcu call.
36b588ed
MD
701 *
702 * RCU read side lock should _NOT_ be held when calling this function.
91d76f53 703 */
8b366481
DG
704static
705void delete_ust_app(struct ust_app *app)
91d76f53 706{
8b366481 707 int ret, sock;
d42f20df 708 struct ust_app_session *ua_sess, *tmp_ua_sess;
44d3bd01 709
d80a6244 710 /* Delete ust app sessions info */
852d0037
DG
711 sock = app->sock;
712 app->sock = -1;
d80a6244 713
8b366481 714 /* Wipe sessions */
d42f20df
DG
715 cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head,
716 teardown_node) {
717 /* Free every object in the session and the session. */
36b588ed 718 rcu_read_lock();
d0b96690 719 delete_ust_app_session(sock, ua_sess, app);
36b588ed 720 rcu_read_unlock();
d80a6244 721 }
36b588ed 722
0b2dc8df
MD
723 ht_cleanup_push(app->sessions);
724 ht_cleanup_push(app->ust_objd);
d80a6244 725
6414a713 726 /*
852d0037
DG
727 * Wait until we have deleted the application from the sock hash table
728 * before closing this socket, otherwise an application could re-use the
729 * socket ID and race with the teardown, using the same hash table entry.
730 *
731 * It's OK to leave the close in call_rcu. We want it to stay unique for
732 * all RCU readers that could run concurrently with unregister app,
733 * therefore we _need_ to only close that socket after a grace period. So
734 * it should stay in this RCU callback.
735 *
736 * This close() is a very important step of the synchronization model so
737 * every modification to this function must be carefully reviewed.
6414a713 738 */
799e2c4f
MD
739 ret = close(sock);
740 if (ret) {
741 PERROR("close");
742 }
4063050c 743 lttng_fd_put(LTTNG_FD_APPS, 1);
d80a6244 744
852d0037 745 DBG2("UST app pid %d deleted", app->pid);
284d8f55 746 free(app);
099e26bd
DG
747}
748
749/*
f6a9efaa 750 * URCU intermediate call to delete an UST app.
099e26bd 751 */
8b366481
DG
752static
753void delete_ust_app_rcu(struct rcu_head *head)
099e26bd 754{
bec39940
DG
755 struct lttng_ht_node_ulong *node =
756 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa 757 struct ust_app *app =
852d0037 758 caa_container_of(node, struct ust_app, pid_n);
f6a9efaa 759
852d0037 760 DBG3("Call RCU deleting app PID %d", app->pid);
f6a9efaa 761 delete_ust_app(app);
099e26bd
DG
762}
763
ffe60014
DG
764/*
765 * Delete the session from the application ht and delete the data structure by
766 * freeing every object inside and releasing them.
767 */
d0b96690 768static void destroy_app_session(struct ust_app *app,
ffe60014
DG
769 struct ust_app_session *ua_sess)
770{
771 int ret;
772 struct lttng_ht_iter iter;
773
774 assert(app);
775 assert(ua_sess);
776
777 iter.iter.node = &ua_sess->node.node;
778 ret = lttng_ht_del(app->sessions, &iter);
779 if (ret) {
780 /* Already scheduled for teardown. */
781 goto end;
782 }
783
784 /* Once deleted, free the data structure. */
d0b96690 785 delete_ust_app_session(app->sock, ua_sess, app);
ffe60014
DG
786
787end:
788 return;
789}
790
8b366481
DG
791/*
792 * Alloc new UST app session.
793 */
794static
d0b96690 795struct ust_app_session *alloc_ust_app_session(struct ust_app *app)
8b366481
DG
796{
797 struct ust_app_session *ua_sess;
798
799 /* Init most of the default value by allocating and zeroing */
800 ua_sess = zmalloc(sizeof(struct ust_app_session));
801 if (ua_sess == NULL) {
802 PERROR("malloc");
ffe60014 803 goto error_free;
8b366481
DG
804 }
805
806 ua_sess->handle = -1;
bec39940 807 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
d0b96690 808 pthread_mutex_init(&ua_sess->lock, NULL);
ffe60014 809
8b366481
DG
810 return ua_sess;
811
ffe60014 812error_free:
8b366481
DG
813 return NULL;
814}
815
816/*
817 * Alloc new UST app channel.
818 */
819static
820struct ust_app_channel *alloc_ust_app_channel(char *name,
d0b96690 821 struct ust_app_session *ua_sess,
ffe60014 822 struct lttng_ust_channel_attr *attr)
8b366481
DG
823{
824 struct ust_app_channel *ua_chan;
825
826 /* Init most of the default value by allocating and zeroing */
827 ua_chan = zmalloc(sizeof(struct ust_app_channel));
828 if (ua_chan == NULL) {
829 PERROR("malloc");
830 goto error;
831 }
832
833 /* Setup channel name */
834 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
835 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
836
837 ua_chan->enabled = 1;
838 ua_chan->handle = -1;
45893984 839 ua_chan->session = ua_sess;
ffe60014 840 ua_chan->key = get_next_channel_key();
bec39940
DG
841 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
842 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
843 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
8b366481
DG
844
845 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
31746f93 846 CDS_INIT_LIST_HEAD(&ua_chan->ctx_list);
8b366481
DG
847
848 /* Copy attributes */
849 if (attr) {
ffe60014 850 /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */
2fe6e7f5
DG
851 ua_chan->attr.subbuf_size = attr->subbuf_size;
852 ua_chan->attr.num_subbuf = attr->num_subbuf;
853 ua_chan->attr.overwrite = attr->overwrite;
854 ua_chan->attr.switch_timer_interval = attr->switch_timer_interval;
855 ua_chan->attr.read_timer_interval = attr->read_timer_interval;
856 ua_chan->attr.output = attr->output;
8b366481 857 }
ffe60014
DG
858 /* By default, the channel is a per cpu channel. */
859 ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU;
8b366481
DG
860
861 DBG3("UST app channel %s allocated", ua_chan->name);
862
863 return ua_chan;
864
865error:
866 return NULL;
867}
868
37f1c236
DG
869/*
870 * Allocate and initialize a UST app stream.
871 *
872 * Return newly allocated stream pointer or NULL on error.
873 */
ffe60014 874struct ust_app_stream *ust_app_alloc_stream(void)
37f1c236
DG
875{
876 struct ust_app_stream *stream = NULL;
877
878 stream = zmalloc(sizeof(*stream));
879 if (stream == NULL) {
880 PERROR("zmalloc ust app stream");
881 goto error;
882 }
883
884 /* Zero could be a valid value for a handle so flag it to -1. */
885 stream->handle = -1;
886
887error:
888 return stream;
889}
890
8b366481
DG
891/*
892 * Alloc new UST app event.
893 */
894static
895struct ust_app_event *alloc_ust_app_event(char *name,
896 struct lttng_ust_event *attr)
897{
898 struct ust_app_event *ua_event;
899
900 /* Init most of the default value by allocating and zeroing */
901 ua_event = zmalloc(sizeof(struct ust_app_event));
902 if (ua_event == NULL) {
903 PERROR("malloc");
904 goto error;
905 }
906
907 ua_event->enabled = 1;
908 strncpy(ua_event->name, name, sizeof(ua_event->name));
909 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
bec39940 910 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
8b366481
DG
911
912 /* Copy attributes */
913 if (attr) {
914 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
915 }
916
917 DBG3("UST app event %s allocated", ua_event->name);
918
919 return ua_event;
920
921error:
922 return NULL;
923}
924
925/*
926 * Alloc new UST app context.
927 */
928static
929struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
930{
931 struct ust_app_ctx *ua_ctx;
932
933 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
934 if (ua_ctx == NULL) {
935 goto error;
936 }
937
31746f93
DG
938 CDS_INIT_LIST_HEAD(&ua_ctx->list);
939
8b366481
DG
940 if (uctx) {
941 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
942 }
943
944 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
945
946error:
947 return ua_ctx;
948}
949
025faf73
DG
950/*
951 * Allocate a filter and copy the given original filter.
952 *
953 * Return allocated filter or NULL on error.
954 */
955static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter(
956 struct lttng_ust_filter_bytecode *orig_f)
957{
958 struct lttng_ust_filter_bytecode *filter = NULL;
959
960 /* Copy filter bytecode */
961 filter = zmalloc(sizeof(*filter) + orig_f->len);
962 if (!filter) {
963 PERROR("zmalloc alloc ust app filter");
964 goto error;
965 }
966
967 memcpy(filter, orig_f, sizeof(*filter) + orig_f->len);
968
969error:
970 return filter;
971}
972
099e26bd 973/*
421cb601
DG
974 * Find an ust_app using the sock and return it. RCU read side lock must be
975 * held before calling this helper function.
099e26bd 976 */
f20baf8e 977struct ust_app *ust_app_find_by_sock(int sock)
099e26bd 978{
bec39940 979 struct lttng_ht_node_ulong *node;
bec39940 980 struct lttng_ht_iter iter;
f6a9efaa 981
852d0037 982 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 983 node = lttng_ht_iter_get_node_ulong(&iter);
f6a9efaa
DG
984 if (node == NULL) {
985 DBG2("UST app find by sock %d not found", sock);
f6a9efaa
DG
986 goto error;
987 }
852d0037
DG
988
989 return caa_container_of(node, struct ust_app, sock_n);
f6a9efaa
DG
990
991error:
992 return NULL;
099e26bd
DG
993}
994
d0b96690
DG
995/*
996 * Find an ust_app using the notify sock and return it. RCU read side lock must
997 * be held before calling this helper function.
998 */
999static struct ust_app *find_app_by_notify_sock(int sock)
1000{
1001 struct lttng_ht_node_ulong *node;
1002 struct lttng_ht_iter iter;
1003
1004 lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock),
1005 &iter);
1006 node = lttng_ht_iter_get_node_ulong(&iter);
1007 if (node == NULL) {
1008 DBG2("UST app find by notify sock %d not found", sock);
1009 goto error;
1010 }
1011
1012 return caa_container_of(node, struct ust_app, notify_sock_n);
1013
1014error:
1015 return NULL;
1016}
1017
025faf73
DG
1018/*
1019 * Lookup for an ust app event based on event name, filter bytecode and the
1020 * event loglevel.
1021 *
1022 * Return an ust_app_event object or NULL on error.
1023 */
18eace3b 1024static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht,
39c5a3a7
JI
1025 char *name, struct lttng_ust_filter_bytecode *filter, int loglevel,
1026 const struct lttng_event_exclusion *exclusion)
18eace3b
DG
1027{
1028 struct lttng_ht_iter iter;
1029 struct lttng_ht_node_str *node;
1030 struct ust_app_event *event = NULL;
1031 struct ust_app_ht_key key;
18eace3b
DG
1032
1033 assert(name);
1034 assert(ht);
1035
1036 /* Setup key for event lookup. */
1037 key.name = name;
1038 key.filter = filter;
1039 key.loglevel = loglevel;
39c5a3a7
JI
1040 /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */
1041 key.exclusion = (struct lttng_ust_event_exclusion *)exclusion;
18eace3b 1042
025faf73
DG
1043 /* Lookup using the event name as hash and a custom match fct. */
1044 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
1045 ht_match_ust_app_event, &key, &iter.iter);
18eace3b
DG
1046 node = lttng_ht_iter_get_node_str(&iter);
1047 if (node == NULL) {
1048 goto end;
1049 }
1050
1051 event = caa_container_of(node, struct ust_app_event, node);
1052
1053end:
18eace3b
DG
1054 return event;
1055}
1056
55cc08a6
DG
1057/*
1058 * Create the channel context on the tracer.
d0b96690
DG
1059 *
1060 * Called with UST app session lock held.
55cc08a6
DG
1061 */
1062static
1063int create_ust_channel_context(struct ust_app_channel *ua_chan,
1064 struct ust_app_ctx *ua_ctx, struct ust_app *app)
1065{
1066 int ret;
1067
840cb59c 1068 health_code_update();
86acf0da 1069
852d0037 1070 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
55cc08a6
DG
1071 ua_chan->obj, &ua_ctx->obj);
1072 if (ret < 0) {
ffe60014
DG
1073 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1074 ERR("UST app create channel context failed for app (pid: %d) "
1075 "with ret %d", app->pid, ret);
1076 } else {
3757b385
DG
1077 /*
1078 * This is normal behavior, an application can die during the
1079 * creation process. Don't report an error so the execution can
1080 * continue normally.
1081 */
1082 ret = 0;
ffe60014
DG
1083 DBG3("UST app disable event failed. Application is dead.");
1084 }
55cc08a6
DG
1085 goto error;
1086 }
1087
1088 ua_ctx->handle = ua_ctx->obj->handle;
1089
d0b96690
DG
1090 DBG2("UST app context handle %d created successfully for channel %s",
1091 ua_ctx->handle, ua_chan->name);
55cc08a6
DG
1092
1093error:
840cb59c 1094 health_code_update();
55cc08a6
DG
1095 return ret;
1096}
1097
53a80697
MD
1098/*
1099 * Set the filter on the tracer.
1100 */
1101static
1102int set_ust_event_filter(struct ust_app_event *ua_event,
1103 struct ust_app *app)
1104{
1105 int ret;
1106
840cb59c 1107 health_code_update();
86acf0da 1108
53a80697 1109 if (!ua_event->filter) {
86acf0da
DG
1110 ret = 0;
1111 goto error;
53a80697
MD
1112 }
1113
1114 ret = ustctl_set_filter(app->sock, ua_event->filter,
1115 ua_event->obj);
1116 if (ret < 0) {
ffe60014
DG
1117 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1118 ERR("UST app event %s filter failed for app (pid: %d) "
1119 "with ret %d", ua_event->attr.name, app->pid, ret);
1120 } else {
3757b385
DG
1121 /*
1122 * This is normal behavior, an application can die during the
1123 * creation process. Don't report an error so the execution can
1124 * continue normally.
1125 */
1126 ret = 0;
ffe60014
DG
1127 DBG3("UST app filter event failed. Application is dead.");
1128 }
53a80697
MD
1129 goto error;
1130 }
1131
1132 DBG2("UST filter set successfully for event %s", ua_event->name);
1133
1134error:
840cb59c 1135 health_code_update();
53a80697
MD
1136 return ret;
1137}
1138
7cc9a73c
JI
1139/*
1140 * Set event exclusions on the tracer.
1141 */
1142static
1143int set_ust_event_exclusion(struct ust_app_event *ua_event,
1144 struct ust_app *app)
1145{
1146 int ret;
1147
1148 health_code_update();
1149
1150 if (!ua_event->exclusion || !ua_event->exclusion->count) {
1151 ret = 0;
1152 goto error;
1153 }
1154
1155 ret = ustctl_set_exclusion(app->sock, ua_event->exclusion,
1156 ua_event->obj);
1157 if (ret < 0) {
1158 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1159 ERR("UST app event %s exclusions failed for app (pid: %d) "
1160 "with ret %d", ua_event->attr.name, app->pid, ret);
1161 } else {
1162 /*
1163 * This is normal behavior, an application can die during the
1164 * creation process. Don't report an error so the execution can
1165 * continue normally.
1166 */
1167 ret = 0;
1168 DBG3("UST app event exclusion failed. Application is dead.");
1169 }
1170 goto error;
1171 }
1172
1173 DBG2("UST exclusion set successfully for event %s", ua_event->name);
1174
1175error:
1176 health_code_update();
1177 return ret;
1178}
1179
9730260e
DG
1180/*
1181 * Disable the specified event on to UST tracer for the UST session.
1182 */
1183static int disable_ust_event(struct ust_app *app,
1184 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
1185{
1186 int ret;
1187
840cb59c 1188 health_code_update();
86acf0da 1189
852d0037 1190 ret = ustctl_disable(app->sock, ua_event->obj);
9730260e 1191 if (ret < 0) {
ffe60014
DG
1192 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1193 ERR("UST app event %s disable failed for app (pid: %d) "
1194 "and session handle %d with ret %d",
1195 ua_event->attr.name, app->pid, ua_sess->handle, ret);
1196 } else {
3757b385
DG
1197 /*
1198 * This is normal behavior, an application can die during the
1199 * creation process. Don't report an error so the execution can
1200 * continue normally.
1201 */
1202 ret = 0;
ffe60014
DG
1203 DBG3("UST app disable event failed. Application is dead.");
1204 }
9730260e
DG
1205 goto error;
1206 }
1207
1208 DBG2("UST app event %s disabled successfully for app (pid: %d)",
852d0037 1209 ua_event->attr.name, app->pid);
9730260e
DG
1210
1211error:
840cb59c 1212 health_code_update();
9730260e
DG
1213 return ret;
1214}
1215
78f0bacd
DG
1216/*
1217 * Disable the specified channel on to UST tracer for the UST session.
1218 */
1219static int disable_ust_channel(struct ust_app *app,
1220 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
1221{
1222 int ret;
1223
840cb59c 1224 health_code_update();
86acf0da 1225
852d0037 1226 ret = ustctl_disable(app->sock, ua_chan->obj);
78f0bacd 1227 if (ret < 0) {
ffe60014
DG
1228 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1229 ERR("UST app channel %s disable failed for app (pid: %d) "
1230 "and session handle %d with ret %d",
1231 ua_chan->name, app->pid, ua_sess->handle, ret);
1232 } else {
3757b385
DG
1233 /*
1234 * This is normal behavior, an application can die during the
1235 * creation process. Don't report an error so the execution can
1236 * continue normally.
1237 */
1238 ret = 0;
ffe60014
DG
1239 DBG3("UST app disable channel failed. Application is dead.");
1240 }
78f0bacd
DG
1241 goto error;
1242 }
1243
78f0bacd 1244 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
852d0037 1245 ua_chan->name, app->pid);
78f0bacd
DG
1246
1247error:
840cb59c 1248 health_code_update();
78f0bacd
DG
1249 return ret;
1250}
1251
1252/*
1253 * Enable the specified channel on to UST tracer for the UST session.
1254 */
1255static int enable_ust_channel(struct ust_app *app,
1256 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
1257{
1258 int ret;
1259
840cb59c 1260 health_code_update();
86acf0da 1261
852d0037 1262 ret = ustctl_enable(app->sock, ua_chan->obj);
78f0bacd 1263 if (ret < 0) {
ffe60014
DG
1264 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1265 ERR("UST app channel %s enable failed for app (pid: %d) "
1266 "and session handle %d with ret %d",
1267 ua_chan->name, app->pid, ua_sess->handle, ret);
1268 } else {
3757b385
DG
1269 /*
1270 * This is normal behavior, an application can die during the
1271 * creation process. Don't report an error so the execution can
1272 * continue normally.
1273 */
1274 ret = 0;
ffe60014
DG
1275 DBG3("UST app enable channel failed. Application is dead.");
1276 }
78f0bacd
DG
1277 goto error;
1278 }
1279
1280 ua_chan->enabled = 1;
1281
1282 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
852d0037 1283 ua_chan->name, app->pid);
78f0bacd
DG
1284
1285error:
840cb59c 1286 health_code_update();
78f0bacd
DG
1287 return ret;
1288}
1289
edb67388
DG
1290/*
1291 * Enable the specified event on to UST tracer for the UST session.
1292 */
1293static int enable_ust_event(struct ust_app *app,
1294 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
1295{
1296 int ret;
1297
840cb59c 1298 health_code_update();
86acf0da 1299
852d0037 1300 ret = ustctl_enable(app->sock, ua_event->obj);
edb67388 1301 if (ret < 0) {
ffe60014
DG
1302 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1303 ERR("UST app event %s enable failed for app (pid: %d) "
1304 "and session handle %d with ret %d",
1305 ua_event->attr.name, app->pid, ua_sess->handle, ret);
1306 } else {
3757b385
DG
1307 /*
1308 * This is normal behavior, an application can die during the
1309 * creation process. Don't report an error so the execution can
1310 * continue normally.
1311 */
1312 ret = 0;
ffe60014
DG
1313 DBG3("UST app enable event failed. Application is dead.");
1314 }
edb67388
DG
1315 goto error;
1316 }
1317
1318 DBG2("UST app event %s enabled successfully for app (pid: %d)",
852d0037 1319 ua_event->attr.name, app->pid);
edb67388
DG
1320
1321error:
840cb59c 1322 health_code_update();
edb67388
DG
1323 return ret;
1324}
1325
099e26bd 1326/*
7972aab2 1327 * Send channel and stream buffer to application.
4f3ab6ee 1328 *
ffe60014 1329 * Return 0 on success. On error, a negative value is returned.
4f3ab6ee 1330 */
7972aab2
DG
1331static int send_channel_pid_to_ust(struct ust_app *app,
1332 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
4f3ab6ee
DG
1333{
1334 int ret;
ffe60014 1335 struct ust_app_stream *stream, *stmp;
4f3ab6ee
DG
1336
1337 assert(app);
ffe60014 1338 assert(ua_sess);
4f3ab6ee 1339 assert(ua_chan);
4f3ab6ee 1340
840cb59c 1341 health_code_update();
4f3ab6ee 1342
7972aab2
DG
1343 DBG("UST app sending channel %s to UST app sock %d", ua_chan->name,
1344 app->sock);
86acf0da 1345
ffe60014
DG
1346 /* Send channel to the application. */
1347 ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
5b4a0ec0 1348 if (ret < 0) {
b551a063
DG
1349 goto error;
1350 }
1351
d88aee68
DG
1352 health_code_update();
1353
ffe60014
DG
1354 /* Send all streams to application. */
1355 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
1356 ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream);
1357 if (ret < 0) {
1358 goto error;
1359 }
1360 /* We don't need the stream anymore once sent to the tracer. */
1361 cds_list_del(&stream->list);
1362 delete_ust_app_stream(-1, stream);
1363 }
ffe60014
DG
1364 /* Flag the channel that it is sent to the application. */
1365 ua_chan->is_sent = 1;
ffe60014 1366
b551a063 1367error:
840cb59c 1368 health_code_update();
b551a063
DG
1369 return ret;
1370}
1371
91d76f53 1372/*
5b4a0ec0 1373 * Create the specified event onto the UST tracer for a UST session.
d0b96690
DG
1374 *
1375 * Should be called with session mutex held.
91d76f53 1376 */
edb67388
DG
1377static
1378int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
1379 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
91d76f53 1380{
5b4a0ec0 1381 int ret = 0;
284d8f55 1382
840cb59c 1383 health_code_update();
86acf0da 1384
5b4a0ec0 1385 /* Create UST event on tracer */
852d0037 1386 ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
5b4a0ec0
DG
1387 &ua_event->obj);
1388 if (ret < 0) {
ffe60014
DG
1389 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1390 ERR("Error ustctl create event %s for app pid: %d with ret %d",
1391 ua_event->attr.name, app->pid, ret);
1392 } else {
3757b385
DG
1393 /*
1394 * This is normal behavior, an application can die during the
1395 * creation process. Don't report an error so the execution can
1396 * continue normally.
1397 */
1398 ret = 0;
ffe60014
DG
1399 DBG3("UST app create event failed. Application is dead.");
1400 }
5b4a0ec0 1401 goto error;
91d76f53 1402 }
f6a9efaa 1403
5b4a0ec0 1404 ua_event->handle = ua_event->obj->handle;
284d8f55 1405
5b4a0ec0 1406 DBG2("UST app event %s created successfully for pid:%d",
852d0037 1407 ua_event->attr.name, app->pid);
f6a9efaa 1408
840cb59c 1409 health_code_update();
86acf0da 1410
025faf73
DG
1411 /* Set filter if one is present. */
1412 if (ua_event->filter) {
1413 ret = set_ust_event_filter(ua_event, app);
1414 if (ret < 0) {
1415 goto error;
1416 }
1417 }
1418
7cc9a73c
JI
1419 /* Set exclusions for the event */
1420 if (ua_event->exclusion) {
1421 ret = set_ust_event_exclusion(ua_event, app);
1422 if (ret < 0) {
1423 goto error;
1424 }
1425 }
1426
8535a6d9 1427 /* If event not enabled, disable it on the tracer */
fc34caaa 1428 if (ua_event->enabled == 0) {
8535a6d9
DG
1429 ret = disable_ust_event(app, ua_sess, ua_event);
1430 if (ret < 0) {
fc34caaa
DG
1431 /*
1432 * If we hit an EPERM, something is wrong with our disable call. If
1433 * we get an EEXIST, there is a problem on the tracer side since we
1434 * just created it.
1435 */
1436 switch (ret) {
49c336c1 1437 case -LTTNG_UST_ERR_PERM:
fc34caaa
DG
1438 /* Code flow problem */
1439 assert(0);
49c336c1 1440 case -LTTNG_UST_ERR_EXIST:
fc34caaa
DG
1441 /* It's OK for our use case. */
1442 ret = 0;
1443 break;
1444 default:
1445 break;
1446 }
8535a6d9
DG
1447 goto error;
1448 }
1449 }
1450
5b4a0ec0 1451error:
840cb59c 1452 health_code_update();
5b4a0ec0 1453 return ret;
91d76f53 1454}
48842b30 1455
5b4a0ec0
DG
1456/*
1457 * Copy data between an UST app event and a LTT event.
1458 */
421cb601 1459static void shadow_copy_event(struct ust_app_event *ua_event,
48842b30
DG
1460 struct ltt_ust_event *uevent)
1461{
b4ffad32
JI
1462 size_t exclusion_alloc_size;
1463
48842b30
DG
1464 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
1465 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
1466
fc34caaa
DG
1467 ua_event->enabled = uevent->enabled;
1468
5b4a0ec0
DG
1469 /* Copy event attributes */
1470 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
1471
53a80697
MD
1472 /* Copy filter bytecode */
1473 if (uevent->filter) {
025faf73
DG
1474 ua_event->filter = alloc_copy_ust_app_filter(uevent->filter);
1475 /* Filter might be NULL here in case of ENONEM. */
53a80697 1476 }
b4ffad32
JI
1477
1478 /* Copy exclusion data */
1479 if (uevent->exclusion) {
1480 exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) +
1481 LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count;
1482 ua_event->exclusion = zmalloc(exclusion_alloc_size);
5f8df26c
JI
1483 if (ua_event->exclusion == NULL) {
1484 PERROR("malloc");
1485 } else {
1486 memcpy(ua_event->exclusion, uevent->exclusion,
1487 exclusion_alloc_size);
b4ffad32
JI
1488 }
1489 }
48842b30
DG
1490}
1491
5b4a0ec0
DG
1492/*
1493 * Copy data between an UST app channel and a LTT channel.
1494 */
421cb601 1495static void shadow_copy_channel(struct ust_app_channel *ua_chan,
48842b30
DG
1496 struct ltt_ust_channel *uchan)
1497{
bec39940 1498 struct lttng_ht_iter iter;
48842b30 1499 struct ltt_ust_event *uevent;
55cc08a6 1500 struct ltt_ust_context *uctx;
48842b30 1501 struct ust_app_event *ua_event;
55cc08a6 1502 struct ust_app_ctx *ua_ctx;
48842b30 1503
fc34caaa 1504 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
48842b30
DG
1505
1506 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
1507 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
ffe60014 1508
1624d5b7
JD
1509 ua_chan->tracefile_size = uchan->tracefile_size;
1510 ua_chan->tracefile_count = uchan->tracefile_count;
1511
ffe60014
DG
1512 /* Copy event attributes since the layout is different. */
1513 ua_chan->attr.subbuf_size = uchan->attr.subbuf_size;
1514 ua_chan->attr.num_subbuf = uchan->attr.num_subbuf;
1515 ua_chan->attr.overwrite = uchan->attr.overwrite;
1516 ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval;
1517 ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval;
1518 ua_chan->attr.output = uchan->attr.output;
1519 /*
1520 * Note that the attribute channel type is not set since the channel on the
1521 * tracing registry side does not have this information.
1522 */
48842b30 1523
fc34caaa 1524 ua_chan->enabled = uchan->enabled;
7972aab2 1525 ua_chan->tracing_channel_id = uchan->id;
fc34caaa 1526
31746f93 1527 cds_list_for_each_entry(uctx, &uchan->ctx_list, list) {
55cc08a6
DG
1528 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
1529 if (ua_ctx == NULL) {
1530 continue;
1531 }
bec39940
DG
1532 lttng_ht_node_init_ulong(&ua_ctx->node,
1533 (unsigned long) ua_ctx->ctx.ctx);
1534 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
31746f93 1535 cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list);
55cc08a6 1536 }
48842b30 1537
421cb601 1538 /* Copy all events from ltt ust channel to ust app channel */
bec39940 1539 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
18eace3b 1540 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
39c5a3a7 1541 uevent->filter, uevent->attr.loglevel, uevent->exclusion);
18eace3b 1542 if (ua_event == NULL) {
421cb601 1543 DBG2("UST event %s not found on shadow copy channel",
48842b30 1544 uevent->attr.name);
284d8f55 1545 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
48842b30 1546 if (ua_event == NULL) {
5b4a0ec0 1547 continue;
48842b30 1548 }
421cb601 1549 shadow_copy_event(ua_event, uevent);
d0b96690 1550 add_unique_ust_app_event(ua_chan, ua_event);
48842b30 1551 }
48842b30
DG
1552 }
1553
fc34caaa 1554 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
48842b30
DG
1555}
1556
5b4a0ec0
DG
1557/*
1558 * Copy data between a UST app session and a regular LTT session.
1559 */
421cb601 1560static void shadow_copy_session(struct ust_app_session *ua_sess,
bec39940 1561 struct ltt_ust_session *usess, struct ust_app *app)
48842b30 1562{
bec39940
DG
1563 struct lttng_ht_node_str *ua_chan_node;
1564 struct lttng_ht_iter iter;
48842b30
DG
1565 struct ltt_ust_channel *uchan;
1566 struct ust_app_channel *ua_chan;
477d7741
MD
1567 time_t rawtime;
1568 struct tm *timeinfo;
1569 char datetime[16];
1570 int ret;
1571
1572 /* Get date and time for unique app path */
1573 time(&rawtime);
1574 timeinfo = localtime(&rawtime);
1575 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
48842b30 1576
421cb601 1577 DBG2("Shadow copy of session handle %d", ua_sess->handle);
48842b30 1578
7972aab2
DG
1579 ua_sess->tracing_id = usess->id;
1580 ua_sess->id = get_next_session_id();
1581 ua_sess->uid = app->uid;
1582 ua_sess->gid = app->gid;
1583 ua_sess->euid = usess->uid;
1584 ua_sess->egid = usess->gid;
1585 ua_sess->buffer_type = usess->buffer_type;
1586 ua_sess->bits_per_long = app->bits_per_long;
1587 /* There is only one consumer object per session possible. */
1588 ua_sess->consumer = usess->consumer;
2bba9e53 1589 ua_sess->output_traces = usess->output_traces;
ecc48a90 1590 ua_sess->live_timer_interval = usess->live_timer_interval;
7972aab2
DG
1591
1592 switch (ua_sess->buffer_type) {
1593 case LTTNG_BUFFER_PER_PID:
1594 ret = snprintf(ua_sess->path, sizeof(ua_sess->path),
dec56f6c 1595 DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid,
7972aab2
DG
1596 datetime);
1597 break;
1598 case LTTNG_BUFFER_PER_UID:
1599 ret = snprintf(ua_sess->path, sizeof(ua_sess->path),
1600 DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long);
1601 break;
1602 default:
1603 assert(0);
1604 goto error;
1605 }
477d7741
MD
1606 if (ret < 0) {
1607 PERROR("asprintf UST shadow copy session");
477d7741 1608 assert(0);
7972aab2 1609 goto error;
477d7741
MD
1610 }
1611
48842b30 1612 /* Iterate over all channels in global domain. */
bec39940
DG
1613 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
1614 uchan, node.node) {
1615 struct lttng_ht_iter uiter;
ba767faf 1616
bec39940
DG
1617 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1618 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
5b4a0ec0 1619 if (ua_chan_node != NULL) {
fc34caaa 1620 /* Session exist. Contiuing. */
5b4a0ec0
DG
1621 continue;
1622 }
421cb601 1623
5b4a0ec0
DG
1624 DBG2("Channel %s not found on shadow session copy, creating it",
1625 uchan->name);
d0b96690 1626 ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr);
5b4a0ec0 1627 if (ua_chan == NULL) {
fc34caaa 1628 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
5b4a0ec0 1629 continue;
48842b30 1630 }
5b4a0ec0 1631 shadow_copy_channel(ua_chan, uchan);
ffe60014
DG
1632 /*
1633 * The concept of metadata channel does not exist on the tracing
1634 * registry side of the session daemon so this can only be a per CPU
1635 * channel and not metadata.
1636 */
1637 ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU;
1638
bec39940 1639 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
48842b30 1640 }
7972aab2
DG
1641
1642error:
1643 return;
48842b30
DG
1644}
1645
78f0bacd
DG
1646/*
1647 * Lookup sesison wrapper.
1648 */
84cd17c6
MD
1649static
1650void __lookup_session_by_app(struct ltt_ust_session *usess,
bec39940 1651 struct ust_app *app, struct lttng_ht_iter *iter)
84cd17c6
MD
1652{
1653 /* Get right UST app session from app */
d9bf3ca4 1654 lttng_ht_lookup(app->sessions, &usess->id, iter);
84cd17c6
MD
1655}
1656
421cb601
DG
1657/*
1658 * Return ust app session from the app session hashtable using the UST session
a991f516 1659 * id.
421cb601 1660 */
48842b30
DG
1661static struct ust_app_session *lookup_session_by_app(
1662 struct ltt_ust_session *usess, struct ust_app *app)
1663{
bec39940 1664 struct lttng_ht_iter iter;
d9bf3ca4 1665 struct lttng_ht_node_u64 *node;
48842b30 1666
84cd17c6 1667 __lookup_session_by_app(usess, app, &iter);
d9bf3ca4 1668 node = lttng_ht_iter_get_node_u64(&iter);
48842b30
DG
1669 if (node == NULL) {
1670 goto error;
1671 }
1672
1673 return caa_container_of(node, struct ust_app_session, node);
1674
1675error:
1676 return NULL;
1677}
1678
7972aab2
DG
1679/*
1680 * Setup buffer registry per PID for the given session and application. If none
1681 * is found, a new one is created, added to the global registry and
1682 * initialized. If regp is valid, it's set with the newly created object.
1683 *
1684 * Return 0 on success or else a negative value.
1685 */
1686static int setup_buffer_reg_pid(struct ust_app_session *ua_sess,
1687 struct ust_app *app, struct buffer_reg_pid **regp)
1688{
1689 int ret = 0;
1690 struct buffer_reg_pid *reg_pid;
1691
1692 assert(ua_sess);
1693 assert(app);
1694
1695 rcu_read_lock();
1696
1697 reg_pid = buffer_reg_pid_find(ua_sess->id);
1698 if (!reg_pid) {
1699 /*
1700 * This is the create channel path meaning that if there is NO
1701 * registry available, we have to create one for this session.
1702 */
1703 ret = buffer_reg_pid_create(ua_sess->id, &reg_pid);
1704 if (ret < 0) {
1705 goto error;
1706 }
1707 buffer_reg_pid_add(reg_pid);
1708 } else {
1709 goto end;
1710 }
1711
1712 /* Initialize registry. */
1713 ret = ust_registry_session_init(&reg_pid->registry->reg.ust, app,
1714 app->bits_per_long, app->uint8_t_alignment,
1715 app->uint16_t_alignment, app->uint32_t_alignment,
af6142cf
MD
1716 app->uint64_t_alignment, app->long_alignment,
1717 app->byte_order, app->version.major,
1718 app->version.minor);
7972aab2
DG
1719 if (ret < 0) {
1720 goto error;
1721 }
1722
1723 DBG3("UST app buffer registry per PID created successfully");
1724
1725end:
1726 if (regp) {
1727 *regp = reg_pid;
1728 }
1729error:
1730 rcu_read_unlock();
1731 return ret;
1732}
1733
1734/*
1735 * Setup buffer registry per UID for the given session and application. If none
1736 * is found, a new one is created, added to the global registry and
1737 * initialized. If regp is valid, it's set with the newly created object.
1738 *
1739 * Return 0 on success or else a negative value.
1740 */
1741static int setup_buffer_reg_uid(struct ltt_ust_session *usess,
1742 struct ust_app *app, struct buffer_reg_uid **regp)
1743{
1744 int ret = 0;
1745 struct buffer_reg_uid *reg_uid;
1746
1747 assert(usess);
1748 assert(app);
1749
1750 rcu_read_lock();
1751
1752 reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid);
1753 if (!reg_uid) {
1754 /*
1755 * This is the create channel path meaning that if there is NO
1756 * registry available, we have to create one for this session.
1757 */
1758 ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid,
1759 LTTNG_DOMAIN_UST, &reg_uid);
1760 if (ret < 0) {
1761 goto error;
1762 }
1763 buffer_reg_uid_add(reg_uid);
1764 } else {
1765 goto end;
1766 }
1767
1768 /* Initialize registry. */
af6142cf 1769 ret = ust_registry_session_init(&reg_uid->registry->reg.ust, NULL,
7972aab2
DG
1770 app->bits_per_long, app->uint8_t_alignment,
1771 app->uint16_t_alignment, app->uint32_t_alignment,
af6142cf
MD
1772 app->uint64_t_alignment, app->long_alignment,
1773 app->byte_order, app->version.major,
1774 app->version.minor);
7972aab2
DG
1775 if (ret < 0) {
1776 goto error;
1777 }
1778 /* Add node to teardown list of the session. */
1779 cds_list_add(&reg_uid->lnode, &usess->buffer_reg_uid_list);
1780
1781 DBG3("UST app buffer registry per UID created successfully");
1782
1783end:
1784 if (regp) {
1785 *regp = reg_uid;
1786 }
1787error:
1788 rcu_read_unlock();
1789 return ret;
1790}
1791
421cb601 1792/*
3d8ca23b 1793 * Create a session on the tracer side for the given app.
421cb601 1794 *
3d8ca23b
DG
1795 * On success, ua_sess_ptr is populated with the session pointer or else left
1796 * untouched. If the session was created, is_created is set to 1. On error,
1797 * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can
1798 * be NULL.
1799 *
1800 * Returns 0 on success or else a negative code which is either -ENOMEM or
1801 * -ENOTCONN which is the default code if the ustctl_create_session fails.
421cb601 1802 */
3d8ca23b
DG
1803static int create_ust_app_session(struct ltt_ust_session *usess,
1804 struct ust_app *app, struct ust_app_session **ua_sess_ptr,
1805 int *is_created)
421cb601 1806{
3d8ca23b 1807 int ret, created = 0;
421cb601
DG
1808 struct ust_app_session *ua_sess;
1809
3d8ca23b
DG
1810 assert(usess);
1811 assert(app);
1812 assert(ua_sess_ptr);
1813
840cb59c 1814 health_code_update();
86acf0da 1815
421cb601
DG
1816 ua_sess = lookup_session_by_app(usess, app);
1817 if (ua_sess == NULL) {
d9bf3ca4 1818 DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it",
852d0037 1819 app->pid, usess->id);
d0b96690 1820 ua_sess = alloc_ust_app_session(app);
421cb601
DG
1821 if (ua_sess == NULL) {
1822 /* Only malloc can failed so something is really wrong */
3d8ca23b
DG
1823 ret = -ENOMEM;
1824 goto error;
421cb601 1825 }
477d7741 1826 shadow_copy_session(ua_sess, usess, app);
3d8ca23b 1827 created = 1;
421cb601
DG
1828 }
1829
7972aab2
DG
1830 switch (usess->buffer_type) {
1831 case LTTNG_BUFFER_PER_PID:
1832 /* Init local registry. */
1833 ret = setup_buffer_reg_pid(ua_sess, app, NULL);
421cb601 1834 if (ret < 0) {
7972aab2
DG
1835 goto error;
1836 }
1837 break;
1838 case LTTNG_BUFFER_PER_UID:
1839 /* Look for a global registry. If none exists, create one. */
1840 ret = setup_buffer_reg_uid(usess, app, NULL);
1841 if (ret < 0) {
1842 goto error;
1843 }
1844 break;
1845 default:
1846 assert(0);
1847 ret = -EINVAL;
1848 goto error;
1849 }
1850
1851 health_code_update();
1852
1853 if (ua_sess->handle == -1) {
1854 ret = ustctl_create_session(app->sock);
1855 if (ret < 0) {
1856 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1857 ERR("Creating session for app pid %d with ret %d",
ffe60014
DG
1858 app->pid, ret);
1859 } else {
1860 DBG("UST app creating session failed. Application is dead");
3757b385
DG
1861 /*
1862 * This is normal behavior, an application can die during the
1863 * creation process. Don't report an error so the execution can
1864 * continue normally. This will get flagged ENOTCONN and the
1865 * caller will handle it.
1866 */
1867 ret = 0;
ffe60014 1868 }
d0b96690 1869 delete_ust_app_session(-1, ua_sess, app);
3d8ca23b
DG
1870 if (ret != -ENOMEM) {
1871 /*
1872 * Tracer is probably gone or got an internal error so let's
1873 * behave like it will soon unregister or not usable.
1874 */
1875 ret = -ENOTCONN;
1876 }
1877 goto error;
421cb601
DG
1878 }
1879
7972aab2
DG
1880 ua_sess->handle = ret;
1881
1882 /* Add ust app session to app's HT */
d9bf3ca4
MD
1883 lttng_ht_node_init_u64(&ua_sess->node,
1884 ua_sess->tracing_id);
1885 lttng_ht_add_unique_u64(app->sessions, &ua_sess->node);
7972aab2
DG
1886
1887 DBG2("UST app session created successfully with handle %d", ret);
1888 }
1889
1890 *ua_sess_ptr = ua_sess;
1891 if (is_created) {
1892 *is_created = created;
1893 }
1894
1895 /* Everything went well. */
1896 ret = 0;
1897
1898error:
1899 health_code_update();
1900 return ret;
1901}
1902
1903/*
1904 * Create a context for the channel on the tracer.
1905 *
1906 * Called with UST app session lock held and a RCU read side lock.
1907 */
1908static
1909int create_ust_app_channel_context(struct ust_app_session *ua_sess,
1910 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
1911 struct ust_app *app)
1912{
1913 int ret = 0;
1914 struct lttng_ht_iter iter;
1915 struct lttng_ht_node_ulong *node;
1916 struct ust_app_ctx *ua_ctx;
1917
1918 DBG2("UST app adding context to channel %s", ua_chan->name);
1919
1920 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1921 node = lttng_ht_iter_get_node_ulong(&iter);
1922 if (node != NULL) {
1923 ret = -EEXIST;
1924 goto error;
1925 }
1926
1927 ua_ctx = alloc_ust_app_ctx(uctx);
1928 if (ua_ctx == NULL) {
1929 /* malloc failed */
1930 ret = -1;
1931 goto error;
1932 }
1933
1934 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1935 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
31746f93 1936 cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list);
7972aab2
DG
1937
1938 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
1939 if (ret < 0) {
1940 goto error;
1941 }
1942
1943error:
1944 return ret;
1945}
1946
1947/*
1948 * Enable on the tracer side a ust app event for the session and channel.
1949 *
1950 * Called with UST app session lock held.
1951 */
1952static
1953int enable_ust_app_event(struct ust_app_session *ua_sess,
1954 struct ust_app_event *ua_event, struct ust_app *app)
1955{
1956 int ret;
1957
1958 ret = enable_ust_event(app, ua_sess, ua_event);
1959 if (ret < 0) {
1960 goto error;
1961 }
1962
1963 ua_event->enabled = 1;
1964
1965error:
1966 return ret;
1967}
1968
1969/*
1970 * Disable on the tracer side a ust app event for the session and channel.
1971 */
1972static int disable_ust_app_event(struct ust_app_session *ua_sess,
1973 struct ust_app_event *ua_event, struct ust_app *app)
1974{
1975 int ret;
1976
1977 ret = disable_ust_event(app, ua_sess, ua_event);
1978 if (ret < 0) {
1979 goto error;
1980 }
1981
1982 ua_event->enabled = 0;
1983
1984error:
1985 return ret;
1986}
1987
1988/*
1989 * Lookup ust app channel for session and disable it on the tracer side.
1990 */
1991static
1992int disable_ust_app_channel(struct ust_app_session *ua_sess,
1993 struct ust_app_channel *ua_chan, struct ust_app *app)
1994{
1995 int ret;
1996
1997 ret = disable_ust_channel(app, ua_sess, ua_chan);
1998 if (ret < 0) {
1999 goto error;
2000 }
2001
2002 ua_chan->enabled = 0;
2003
2004error:
2005 return ret;
2006}
2007
2008/*
2009 * Lookup ust app channel for session and enable it on the tracer side. This
2010 * MUST be called with a RCU read side lock acquired.
2011 */
2012static int enable_ust_app_channel(struct ust_app_session *ua_sess,
2013 struct ltt_ust_channel *uchan, struct ust_app *app)
2014{
2015 int ret = 0;
2016 struct lttng_ht_iter iter;
2017 struct lttng_ht_node_str *ua_chan_node;
2018 struct ust_app_channel *ua_chan;
2019
2020 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2021 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2022 if (ua_chan_node == NULL) {
d9bf3ca4 2023 DBG2("Unable to find channel %s in ust session id %" PRIu64,
7972aab2
DG
2024 uchan->name, ua_sess->tracing_id);
2025 goto error;
2026 }
2027
2028 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2029
2030 ret = enable_ust_channel(app, ua_sess, ua_chan);
2031 if (ret < 0) {
2032 goto error;
2033 }
2034
2035error:
2036 return ret;
2037}
2038
2039/*
2040 * Ask the consumer to create a channel and get it if successful.
2041 *
2042 * Return 0 on success or else a negative value.
2043 */
2044static int do_consumer_create_channel(struct ltt_ust_session *usess,
2045 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan,
2046 int bitness, struct ust_registry_session *registry)
2047{
2048 int ret;
2049 unsigned int nb_fd = 0;
2050 struct consumer_socket *socket;
2051
2052 assert(usess);
2053 assert(ua_sess);
2054 assert(ua_chan);
2055 assert(registry);
2056
2057 rcu_read_lock();
2058 health_code_update();
2059
2060 /* Get the right consumer socket for the application. */
2061 socket = consumer_find_socket_by_bitness(bitness, usess->consumer);
2062 if (!socket) {
2063 ret = -EINVAL;
2064 goto error;
2065 }
2066
2067 health_code_update();
2068
2069 /* Need one fd for the channel. */
2070 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2071 if (ret < 0) {
2072 ERR("Exhausted number of available FD upon create channel");
2073 goto error;
2074 }
2075
2076 /*
2077 * Ask consumer to create channel. The consumer will return the number of
2078 * stream we have to expect.
2079 */
2080 ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket,
2081 registry);
2082 if (ret < 0) {
2083 goto error_ask;
2084 }
2085
2086 /*
2087 * Compute the number of fd needed before receiving them. It must be 2 per
2088 * stream (2 being the default value here).
2089 */
2090 nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count;
2091
2092 /* Reserve the amount of file descriptor we need. */
2093 ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd);
2094 if (ret < 0) {
2095 ERR("Exhausted number of available FD upon create channel");
2096 goto error_fd_get_stream;
2097 }
2098
2099 health_code_update();
2100
2101 /*
2102 * Now get the channel from the consumer. This call wil populate the stream
2103 * list of that channel and set the ust objects.
2104 */
d9078d0c
DG
2105 if (usess->consumer->enabled) {
2106 ret = ust_consumer_get_channel(socket, ua_chan);
2107 if (ret < 0) {
2108 goto error_destroy;
2109 }
7972aab2
DG
2110 }
2111
2112 rcu_read_unlock();
2113 return 0;
2114
2115error_destroy:
2116 lttng_fd_put(LTTNG_FD_APPS, nb_fd);
2117error_fd_get_stream:
2118 /*
2119 * Initiate a destroy channel on the consumer since we had an error
2120 * handling it on our side. The return value is of no importance since we
2121 * already have a ret value set by the previous error that we need to
2122 * return.
2123 */
2124 (void) ust_consumer_destroy_channel(socket, ua_chan);
2125error_ask:
2126 lttng_fd_put(LTTNG_FD_APPS, 1);
2127error:
2128 health_code_update();
2129 rcu_read_unlock();
2130 return ret;
2131}
2132
2133/*
2134 * Duplicate the ust data object of the ust app stream and save it in the
2135 * buffer registry stream.
2136 *
2137 * Return 0 on success or else a negative value.
2138 */
2139static int duplicate_stream_object(struct buffer_reg_stream *reg_stream,
2140 struct ust_app_stream *stream)
2141{
2142 int ret;
2143
2144 assert(reg_stream);
2145 assert(stream);
2146
2147 /* Reserve the amount of file descriptor we need. */
2148 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2149 if (ret < 0) {
2150 ERR("Exhausted number of available FD upon duplicate stream");
2151 goto error;
2152 }
2153
2154 /* Duplicate object for stream once the original is in the registry. */
2155 ret = ustctl_duplicate_ust_object_data(&stream->obj,
2156 reg_stream->obj.ust);
2157 if (ret < 0) {
2158 ERR("Duplicate stream obj from %p to %p failed with ret %d",
2159 reg_stream->obj.ust, stream->obj, ret);
2160 lttng_fd_put(LTTNG_FD_APPS, 2);
2161 goto error;
2162 }
2163 stream->handle = stream->obj->handle;
2164
2165error:
2166 return ret;
2167}
2168
2169/*
2170 * Duplicate the ust data object of the ust app. channel and save it in the
2171 * buffer registry channel.
2172 *
2173 * Return 0 on success or else a negative value.
2174 */
2175static int duplicate_channel_object(struct buffer_reg_channel *reg_chan,
2176 struct ust_app_channel *ua_chan)
2177{
2178 int ret;
2179
2180 assert(reg_chan);
2181 assert(ua_chan);
2182
2183 /* Need two fds for the channel. */
2184 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2185 if (ret < 0) {
2186 ERR("Exhausted number of available FD upon duplicate channel");
2187 goto error_fd_get;
2188 }
2189
2190 /* Duplicate object for stream once the original is in the registry. */
2191 ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust);
2192 if (ret < 0) {
2193 ERR("Duplicate channel obj from %p to %p failed with ret: %d",
2194 reg_chan->obj.ust, ua_chan->obj, ret);
2195 goto error;
2196 }
2197 ua_chan->handle = ua_chan->obj->handle;
2198
2199 return 0;
2200
2201error:
2202 lttng_fd_put(LTTNG_FD_APPS, 1);
2203error_fd_get:
2204 return ret;
2205}
2206
2207/*
2208 * For a given channel buffer registry, setup all streams of the given ust
2209 * application channel.
2210 *
2211 * Return 0 on success or else a negative value.
2212 */
2213static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan,
2214 struct ust_app_channel *ua_chan)
2215{
2216 int ret = 0;
2217 struct ust_app_stream *stream, *stmp;
2218
2219 assert(reg_chan);
2220 assert(ua_chan);
2221
2222 DBG2("UST app setup buffer registry stream");
2223
2224 /* Send all streams to application. */
2225 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
2226 struct buffer_reg_stream *reg_stream;
2227
2228 ret = buffer_reg_stream_create(&reg_stream);
2229 if (ret < 0) {
2230 goto error;
2231 }
2232
2233 /*
2234 * Keep original pointer and nullify it in the stream so the delete
2235 * stream call does not release the object.
2236 */
2237 reg_stream->obj.ust = stream->obj;
2238 stream->obj = NULL;
2239 buffer_reg_stream_add(reg_stream, reg_chan);
421cb601 2240
7972aab2
DG
2241 /* We don't need the streams anymore. */
2242 cds_list_del(&stream->list);
2243 delete_ust_app_stream(-1, stream);
2244 }
421cb601 2245
7972aab2
DG
2246error:
2247 return ret;
2248}
2249
2250/*
2251 * Create a buffer registry channel for the given session registry and
2252 * application channel object. If regp pointer is valid, it's set with the
2253 * created object. Important, the created object is NOT added to the session
2254 * registry hash table.
2255 *
2256 * Return 0 on success else a negative value.
2257 */
2258static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess,
2259 struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp)
2260{
2261 int ret;
2262 struct buffer_reg_channel *reg_chan = NULL;
2263
2264 assert(reg_sess);
2265 assert(ua_chan);
2266
2267 DBG2("UST app creating buffer registry channel for %s", ua_chan->name);
2268
2269 /* Create buffer registry channel. */
2270 ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, &reg_chan);
2271 if (ret < 0) {
2272 goto error_create;
421cb601 2273 }
7972aab2
DG
2274 assert(reg_chan);
2275 reg_chan->consumer_key = ua_chan->key;
8c924c7b 2276 reg_chan->subbuf_size = ua_chan->attr.subbuf_size;
421cb601 2277
7972aab2
DG
2278 /* Create and add a channel registry to session. */
2279 ret = ust_registry_channel_add(reg_sess->reg.ust,
2280 ua_chan->tracing_channel_id);
2281 if (ret < 0) {
2282 goto error;
d88aee68 2283 }
7972aab2 2284 buffer_reg_channel_add(reg_sess, reg_chan);
d88aee68 2285
7972aab2
DG
2286 if (regp) {
2287 *regp = reg_chan;
3d8ca23b 2288 }
d88aee68 2289
7972aab2 2290 return 0;
3d8ca23b
DG
2291
2292error:
7972aab2
DG
2293 /* Safe because the registry channel object was not added to any HT. */
2294 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
2295error_create:
3d8ca23b 2296 return ret;
421cb601
DG
2297}
2298
55cc08a6 2299/*
7972aab2
DG
2300 * Setup buffer registry channel for the given session registry and application
2301 * channel object. If regp pointer is valid, it's set with the created object.
d0b96690 2302 *
7972aab2 2303 * Return 0 on success else a negative value.
55cc08a6 2304 */
7972aab2
DG
2305static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess,
2306 struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan)
55cc08a6 2307{
7972aab2 2308 int ret;
55cc08a6 2309
7972aab2
DG
2310 assert(reg_sess);
2311 assert(reg_chan);
2312 assert(ua_chan);
2313 assert(ua_chan->obj);
55cc08a6 2314
7972aab2 2315 DBG2("UST app setup buffer registry channel for %s", ua_chan->name);
55cc08a6 2316
7972aab2
DG
2317 /* Setup all streams for the registry. */
2318 ret = setup_buffer_reg_streams(reg_chan, ua_chan);
2319 if (ret < 0) {
55cc08a6
DG
2320 goto error;
2321 }
2322
7972aab2
DG
2323 reg_chan->obj.ust = ua_chan->obj;
2324 ua_chan->obj = NULL;
55cc08a6 2325
7972aab2 2326 return 0;
55cc08a6
DG
2327
2328error:
7972aab2
DG
2329 buffer_reg_channel_remove(reg_sess, reg_chan);
2330 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
55cc08a6
DG
2331 return ret;
2332}
2333
edb67388 2334/*
7972aab2 2335 * Send buffer registry channel to the application.
d0b96690 2336 *
7972aab2 2337 * Return 0 on success else a negative value.
edb67388 2338 */
7972aab2
DG
2339static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan,
2340 struct ust_app *app, struct ust_app_session *ua_sess,
2341 struct ust_app_channel *ua_chan)
edb67388
DG
2342{
2343 int ret;
7972aab2 2344 struct buffer_reg_stream *reg_stream;
edb67388 2345
7972aab2
DG
2346 assert(reg_chan);
2347 assert(app);
2348 assert(ua_sess);
2349 assert(ua_chan);
2350
2351 DBG("UST app sending buffer registry channel to ust sock %d", app->sock);
2352
2353 ret = duplicate_channel_object(reg_chan, ua_chan);
edb67388
DG
2354 if (ret < 0) {
2355 goto error;
2356 }
2357
7972aab2
DG
2358 /* Send channel to the application. */
2359 ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
2360 if (ret < 0) {
2361 goto error;
2362 }
2363
2364 health_code_update();
2365
2366 /* Send all streams to application. */
2367 pthread_mutex_lock(&reg_chan->stream_list_lock);
2368 cds_list_for_each_entry(reg_stream, &reg_chan->streams, lnode) {
2369 struct ust_app_stream stream;
2370
2371 ret = duplicate_stream_object(reg_stream, &stream);
2372 if (ret < 0) {
2373 goto error_stream_unlock;
2374 }
2375
2376 ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream);
2377 if (ret < 0) {
8c067051 2378 (void) release_ust_app_stream(-1, &stream);
7972aab2
DG
2379 goto error_stream_unlock;
2380 }
edb67388 2381
7972aab2
DG
2382 /*
2383 * The return value is not important here. This function will output an
2384 * error if needed.
2385 */
2386 (void) release_ust_app_stream(-1, &stream);
2387 }
2388 ua_chan->is_sent = 1;
2389
2390error_stream_unlock:
2391 pthread_mutex_unlock(&reg_chan->stream_list_lock);
edb67388
DG
2392error:
2393 return ret;
2394}
2395
9730260e 2396/*
7972aab2
DG
2397 * Create and send to the application the created buffers with per UID buffers.
2398 *
2399 * Return 0 on success else a negative value.
9730260e 2400 */
7972aab2
DG
2401static int create_channel_per_uid(struct ust_app *app,
2402 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2403 struct ust_app_channel *ua_chan)
9730260e
DG
2404{
2405 int ret;
7972aab2
DG
2406 struct buffer_reg_uid *reg_uid;
2407 struct buffer_reg_channel *reg_chan;
9730260e 2408
7972aab2
DG
2409 assert(app);
2410 assert(usess);
2411 assert(ua_sess);
2412 assert(ua_chan);
2413
2414 DBG("UST app creating channel %s with per UID buffers", ua_chan->name);
2415
2416 reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid);
2417 /*
2418 * The session creation handles the creation of this global registry
2419 * object. If none can be find, there is a code flow problem or a
2420 * teardown race.
2421 */
2422 assert(reg_uid);
2423
2424 reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id,
2425 reg_uid);
2426 if (!reg_chan) {
2427 /* Create the buffer registry channel object. */
2428 ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, &reg_chan);
2429 if (ret < 0) {
2430 goto error;
2431 }
2432 assert(reg_chan);
2433
2434 /*
2435 * Create the buffers on the consumer side. This call populates the
2436 * ust app channel object with all streams and data object.
2437 */
2438 ret = do_consumer_create_channel(usess, ua_sess, ua_chan,
2439 app->bits_per_long, reg_uid->registry->reg.ust);
2440 if (ret < 0) {
07d2ae95
DG
2441 /*
2442 * Let's remove the previously created buffer registry channel so
2443 * it's not visible anymore in the session registry.
2444 */
2445 ust_registry_channel_del_free(reg_uid->registry->reg.ust,
2446 ua_chan->tracing_channel_id);
2447 buffer_reg_channel_remove(reg_uid->registry, reg_chan);
2448 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
7972aab2
DG
2449 goto error;
2450 }
2451
2452 /*
2453 * Setup the streams and add it to the session registry.
2454 */
2455 ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan);
2456 if (ret < 0) {
2457 goto error;
2458 }
2459
2460 }
2461
2462 /* Send buffers to the application. */
2463 ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan);
9730260e
DG
2464 if (ret < 0) {
2465 goto error;
2466 }
2467
9730260e
DG
2468error:
2469 return ret;
2470}
2471
78f0bacd 2472/*
7972aab2
DG
2473 * Create and send to the application the created buffers with per PID buffers.
2474 *
2475 * Return 0 on success else a negative value.
78f0bacd 2476 */
7972aab2
DG
2477static int create_channel_per_pid(struct ust_app *app,
2478 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2479 struct ust_app_channel *ua_chan)
78f0bacd 2480{
8535a6d9 2481 int ret;
7972aab2 2482 struct ust_registry_session *registry;
78f0bacd 2483
7972aab2
DG
2484 assert(app);
2485 assert(usess);
2486 assert(ua_sess);
2487 assert(ua_chan);
2488
2489 DBG("UST app creating channel %s with per PID buffers", ua_chan->name);
2490
2491 rcu_read_lock();
2492
2493 registry = get_session_registry(ua_sess);
2494 assert(registry);
2495
2496 /* Create and add a new channel registry to session. */
2497 ret = ust_registry_channel_add(registry, ua_chan->key);
78f0bacd
DG
2498 if (ret < 0) {
2499 goto error;
2500 }
2501
7972aab2
DG
2502 /* Create and get channel on the consumer side. */
2503 ret = do_consumer_create_channel(usess, ua_sess, ua_chan,
2504 app->bits_per_long, registry);
2505 if (ret < 0) {
2506 goto error;
2507 }
2508
2509 ret = send_channel_pid_to_ust(app, ua_sess, ua_chan);
2510 if (ret < 0) {
2511 goto error;
2512 }
8535a6d9 2513
78f0bacd 2514error:
7972aab2 2515 rcu_read_unlock();
78f0bacd
DG
2516 return ret;
2517}
2518
2519/*
7972aab2
DG
2520 * From an already allocated ust app channel, create the channel buffers if
2521 * need and send it to the application. This MUST be called with a RCU read
2522 * side lock acquired.
2523 *
2524 * Return 0 on success or else a negative value.
78f0bacd 2525 */
7972aab2
DG
2526static int do_create_channel(struct ust_app *app,
2527 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2528 struct ust_app_channel *ua_chan)
78f0bacd 2529{
7972aab2 2530 int ret;
78f0bacd 2531
7972aab2
DG
2532 assert(app);
2533 assert(usess);
2534 assert(ua_sess);
2535 assert(ua_chan);
2536
2537 /* Handle buffer type before sending the channel to the application. */
2538 switch (usess->buffer_type) {
2539 case LTTNG_BUFFER_PER_UID:
2540 {
2541 ret = create_channel_per_uid(app, usess, ua_sess, ua_chan);
2542 if (ret < 0) {
2543 goto error;
2544 }
2545 break;
2546 }
2547 case LTTNG_BUFFER_PER_PID:
2548 {
2549 ret = create_channel_per_pid(app, usess, ua_sess, ua_chan);
2550 if (ret < 0) {
2551 goto error;
2552 }
2553 break;
2554 }
2555 default:
2556 assert(0);
2557 ret = -EINVAL;
78f0bacd
DG
2558 goto error;
2559 }
2560
7972aab2
DG
2561 /* Initialize ust objd object using the received handle and add it. */
2562 lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle);
2563 lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node);
78f0bacd 2564
7972aab2
DG
2565 /* If channel is not enabled, disable it on the tracer */
2566 if (!ua_chan->enabled) {
2567 ret = disable_ust_channel(app, ua_sess, ua_chan);
2568 if (ret < 0) {
2569 goto error;
2570 }
78f0bacd
DG
2571 }
2572
2573error:
2574 return ret;
2575}
2576
284d8f55 2577/*
4d710ac2
DG
2578 * Create UST app channel and create it on the tracer. Set ua_chanp of the
2579 * newly created channel if not NULL.
d0b96690 2580 *
36b588ed 2581 * Called with UST app session lock and RCU read-side lock held.
7972aab2
DG
2582 *
2583 * Return 0 on success or else a negative value.
284d8f55 2584 */
4d710ac2
DG
2585static int create_ust_app_channel(struct ust_app_session *ua_sess,
2586 struct ltt_ust_channel *uchan, struct ust_app *app,
7972aab2 2587 enum lttng_ust_chan_type type, struct ltt_ust_session *usess,
4d710ac2 2588 struct ust_app_channel **ua_chanp)
5b4a0ec0
DG
2589{
2590 int ret = 0;
bec39940
DG
2591 struct lttng_ht_iter iter;
2592 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
2593 struct ust_app_channel *ua_chan;
2594
2595 /* Lookup channel in the ust app session */
bec39940
DG
2596 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2597 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
fc34caaa 2598 if (ua_chan_node != NULL) {
5b4a0ec0 2599 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
fc34caaa 2600 goto end;
5b4a0ec0
DG
2601 }
2602
d0b96690 2603 ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr);
fc34caaa
DG
2604 if (ua_chan == NULL) {
2605 /* Only malloc can fail here */
4d710ac2 2606 ret = -ENOMEM;
094d1690 2607 goto error_alloc;
fc34caaa
DG
2608 }
2609 shadow_copy_channel(ua_chan, uchan);
2610
ffe60014
DG
2611 /* Set channel type. */
2612 ua_chan->attr.type = type;
2613
7972aab2 2614 ret = do_create_channel(app, usess, ua_sess, ua_chan);
5b4a0ec0
DG
2615 if (ret < 0) {
2616 goto error;
2617 }
2618
fc34caaa 2619 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
852d0037 2620 app->pid);
fc34caaa 2621
d0b96690
DG
2622 /* Only add the channel if successful on the tracer side. */
2623 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
2624
fc34caaa 2625end:
4d710ac2
DG
2626 if (ua_chanp) {
2627 *ua_chanp = ua_chan;
2628 }
2629
2630 /* Everything went well. */
2631 return 0;
5b4a0ec0
DG
2632
2633error:
d0b96690 2634 delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app);
094d1690 2635error_alloc:
4d710ac2 2636 return ret;
5b4a0ec0
DG
2637}
2638
2639/*
2640 * Create UST app event and create it on the tracer side.
d0b96690
DG
2641 *
2642 * Called with ust app session mutex held.
5b4a0ec0 2643 */
edb67388
DG
2644static
2645int create_ust_app_event(struct ust_app_session *ua_sess,
2646 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
2647 struct ust_app *app)
284d8f55 2648{
edb67388 2649 int ret = 0;
5b4a0ec0 2650 struct ust_app_event *ua_event;
284d8f55 2651
5b4a0ec0 2652 /* Get event node */
18eace3b 2653 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
39c5a3a7 2654 uevent->filter, uevent->attr.loglevel, uevent->exclusion);
18eace3b 2655 if (ua_event != NULL) {
fc34caaa 2656 ret = -EEXIST;
edb67388
DG
2657 goto end;
2658 }
5b4a0ec0 2659
edb67388
DG
2660 /* Does not exist so create one */
2661 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
2662 if (ua_event == NULL) {
2663 /* Only malloc can failed so something is really wrong */
2664 ret = -ENOMEM;
fc34caaa 2665 goto end;
5b4a0ec0 2666 }
edb67388 2667 shadow_copy_event(ua_event, uevent);
5b4a0ec0 2668
edb67388 2669 /* Create it on the tracer side */
5b4a0ec0 2670 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 2671 if (ret < 0) {
fc34caaa 2672 /* Not found previously means that it does not exist on the tracer */
76f66f63 2673 assert(ret != -LTTNG_UST_ERR_EXIST);
284d8f55
DG
2674 goto error;
2675 }
2676
d0b96690 2677 add_unique_ust_app_event(ua_chan, ua_event);
284d8f55 2678
fc34caaa 2679 DBG2("UST app create event %s for PID %d completed", ua_event->name,
852d0037 2680 app->pid);
7f79d3a1 2681
edb67388 2682end:
fc34caaa
DG
2683 return ret;
2684
5b4a0ec0 2685error:
fc34caaa
DG
2686 /* Valid. Calling here is already in a read side lock */
2687 delete_ust_app_event(-1, ua_event);
edb67388 2688 return ret;
5b4a0ec0
DG
2689}
2690
2691/*
2692 * Create UST metadata and open it on the tracer side.
d0b96690 2693 *
7972aab2 2694 * Called with UST app session lock held and RCU read side lock.
5b4a0ec0
DG
2695 */
2696static int create_ust_app_metadata(struct ust_app_session *ua_sess,
d65d2de8
DG
2697 struct ust_app *app, struct consumer_output *consumer,
2698 struct ustctl_consumer_channel_attr *attr)
5b4a0ec0
DG
2699{
2700 int ret = 0;
ffe60014 2701 struct ust_app_channel *metadata;
d88aee68 2702 struct consumer_socket *socket;
7972aab2 2703 struct ust_registry_session *registry;
5b4a0ec0 2704
ffe60014
DG
2705 assert(ua_sess);
2706 assert(app);
d88aee68 2707 assert(consumer);
5b4a0ec0 2708
7972aab2
DG
2709 registry = get_session_registry(ua_sess);
2710 assert(registry);
2711
1b532a60
DG
2712 /* Metadata already exists for this registry or it was closed previously */
2713 if (registry->metadata_key || registry->metadata_closed) {
7972aab2
DG
2714 ret = 0;
2715 goto error;
5b4a0ec0
DG
2716 }
2717
ffe60014 2718 /* Allocate UST metadata */
d0b96690 2719 metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL);
ffe60014
DG
2720 if (!metadata) {
2721 /* malloc() failed */
2722 ret = -ENOMEM;
2723 goto error;
2724 }
5b4a0ec0 2725
d65d2de8
DG
2726 if (!attr) {
2727 /* Set default attributes for metadata. */
2728 metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
2729 metadata->attr.subbuf_size = default_get_metadata_subbuf_size();
2730 metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
0a9c6494
DG
2731 metadata->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER;
2732 metadata->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER;
d65d2de8
DG
2733 metadata->attr.output = LTTNG_UST_MMAP;
2734 metadata->attr.type = LTTNG_UST_CHAN_METADATA;
2735 } else {
2736 memcpy(&metadata->attr, attr, sizeof(metadata->attr));
2737 metadata->attr.output = LTTNG_UST_MMAP;
2738 metadata->attr.type = LTTNG_UST_CHAN_METADATA;
2739 }
5b4a0ec0 2740
7972aab2
DG
2741 /* Need one fd for the channel. */
2742 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2743 if (ret < 0) {
2744 ERR("Exhausted number of available FD upon create metadata");
2745 goto error;
2746 }
2747
4dc3dfc5
DG
2748 /* Get the right consumer socket for the application. */
2749 socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer);
2750 if (!socket) {
2751 ret = -EINVAL;
2752 goto error_consumer;
2753 }
2754
331744e3
JD
2755 /*
2756 * Keep metadata key so we can identify it on the consumer side. Assign it
2757 * to the registry *before* we ask the consumer so we avoid the race of the
2758 * consumer requesting the metadata and the ask_channel call on our side
2759 * did not returned yet.
2760 */
2761 registry->metadata_key = metadata->key;
2762
d88aee68
DG
2763 /*
2764 * Ask the metadata channel creation to the consumer. The metadata object
2765 * will be created by the consumer and kept their. However, the stream is
2766 * never added or monitored until we do a first push metadata to the
2767 * consumer.
2768 */
7972aab2
DG
2769 ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket,
2770 registry);
d88aee68 2771 if (ret < 0) {
f2a444f1
DG
2772 /* Nullify the metadata key so we don't try to close it later on. */
2773 registry->metadata_key = 0;
d88aee68
DG
2774 goto error_consumer;
2775 }
2776
2777 /*
2778 * The setup command will make the metadata stream be sent to the relayd,
2779 * if applicable, and the thread managing the metadatas. This is important
2780 * because after this point, if an error occurs, the only way the stream
2781 * can be deleted is to be monitored in the consumer.
2782 */
7972aab2 2783 ret = consumer_setup_metadata(socket, metadata->key);
ffe60014 2784 if (ret < 0) {
f2a444f1
DG
2785 /* Nullify the metadata key so we don't try to close it later on. */
2786 registry->metadata_key = 0;
d88aee68 2787 goto error_consumer;
5b4a0ec0
DG
2788 }
2789
7972aab2
DG
2790 DBG2("UST metadata with key %" PRIu64 " created for app pid %d",
2791 metadata->key, app->pid);
5b4a0ec0 2792
d88aee68 2793error_consumer:
b80f0b6c 2794 lttng_fd_put(LTTNG_FD_APPS, 1);
d88aee68 2795 delete_ust_app_channel(-1, metadata, app);
5b4a0ec0 2796error:
ffe60014 2797 return ret;
5b4a0ec0
DG
2798}
2799
2800/*
2801 * Return pointer to traceable apps list.
2802 */
bec39940 2803struct lttng_ht *ust_app_get_ht(void)
5b4a0ec0
DG
2804{
2805 return ust_app_ht;
2806}
2807
2808/*
d88aee68
DG
2809 * Return ust app pointer or NULL if not found. RCU read side lock MUST be
2810 * acquired before calling this function.
5b4a0ec0
DG
2811 */
2812struct ust_app *ust_app_find_by_pid(pid_t pid)
2813{
d88aee68 2814 struct ust_app *app = NULL;
bec39940
DG
2815 struct lttng_ht_node_ulong *node;
2816 struct lttng_ht_iter iter;
5b4a0ec0 2817
bec39940
DG
2818 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
2819 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
2820 if (node == NULL) {
2821 DBG2("UST app no found with pid %d", pid);
2822 goto error;
2823 }
5b4a0ec0
DG
2824
2825 DBG2("Found UST app by pid %d", pid);
2826
d88aee68 2827 app = caa_container_of(node, struct ust_app, pid_n);
5b4a0ec0
DG
2828
2829error:
d88aee68 2830 return app;
5b4a0ec0
DG
2831}
2832
d88aee68
DG
2833/*
2834 * Allocate and init an UST app object using the registration information and
2835 * the command socket. This is called when the command socket connects to the
2836 * session daemon.
2837 *
2838 * The object is returned on success or else NULL.
2839 */
d0b96690 2840struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock)
5b4a0ec0 2841{
d0b96690
DG
2842 struct ust_app *lta = NULL;
2843
2844 assert(msg);
2845 assert(sock >= 0);
2846
2847 DBG3("UST app creating application for socket %d", sock);
5b4a0ec0 2848
173af62f
DG
2849 if ((msg->bits_per_long == 64 &&
2850 (uatomic_read(&ust_consumerd64_fd) == -EINVAL))
2851 || (msg->bits_per_long == 32 &&
2852 (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) {
f943b0fb 2853 ERR("Registration failed: application \"%s\" (pid: %d) has "
d0b96690
DG
2854 "%d-bit long, but no consumerd for this size is available.\n",
2855 msg->name, msg->pid, msg->bits_per_long);
2856 goto error;
3f2c5fcc 2857 }
d0b96690 2858
5b4a0ec0
DG
2859 lta = zmalloc(sizeof(struct ust_app));
2860 if (lta == NULL) {
2861 PERROR("malloc");
d0b96690 2862 goto error;
5b4a0ec0
DG
2863 }
2864
2865 lta->ppid = msg->ppid;
2866 lta->uid = msg->uid;
2867 lta->gid = msg->gid;
d0b96690 2868
7753dea8 2869 lta->bits_per_long = msg->bits_per_long;
d0b96690
DG
2870 lta->uint8_t_alignment = msg->uint8_t_alignment;
2871 lta->uint16_t_alignment = msg->uint16_t_alignment;
2872 lta->uint32_t_alignment = msg->uint32_t_alignment;
2873 lta->uint64_t_alignment = msg->uint64_t_alignment;
2874 lta->long_alignment = msg->long_alignment;
2875 lta->byte_order = msg->byte_order;
2876
5b4a0ec0
DG
2877 lta->v_major = msg->major;
2878 lta->v_minor = msg->minor;
d9bf3ca4 2879 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
d0b96690
DG
2880 lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
2881 lta->notify_sock = -1;
d88aee68
DG
2882
2883 /* Copy name and make sure it's NULL terminated. */
2884 strncpy(lta->name, msg->name, sizeof(lta->name));
2885 lta->name[UST_APP_PROCNAME_LEN] = '\0';
2886
2887 /*
2888 * Before this can be called, when receiving the registration information,
2889 * the application compatibility is checked. So, at this point, the
2890 * application can work with this session daemon.
2891 */
d0b96690 2892 lta->compatible = 1;
5b4a0ec0 2893
852d0037 2894 lta->pid = msg->pid;
d0b96690 2895 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long) lta->pid);
852d0037 2896 lta->sock = sock;
d0b96690 2897 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long) lta->sock);
5b4a0ec0 2898
d42f20df
DG
2899 CDS_INIT_LIST_HEAD(&lta->teardown_head);
2900
d0b96690
DG
2901error:
2902 return lta;
2903}
2904
d88aee68
DG
2905/*
2906 * For a given application object, add it to every hash table.
2907 */
d0b96690
DG
2908void ust_app_add(struct ust_app *app)
2909{
2910 assert(app);
2911 assert(app->notify_sock >= 0);
2912
5b4a0ec0 2913 rcu_read_lock();
852d0037
DG
2914
2915 /*
2916 * On a re-registration, we want to kick out the previous registration of
2917 * that pid
2918 */
d0b96690 2919 lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n);
852d0037
DG
2920
2921 /*
2922 * The socket _should_ be unique until _we_ call close. So, a add_unique
2923 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
2924 * already in the table.
2925 */
d0b96690 2926 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n);
852d0037 2927
d0b96690
DG
2928 /* Add application to the notify socket hash table. */
2929 lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock);
2930 lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n);
5b4a0ec0 2931
d0b96690 2932 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s "
d88aee68
DG
2933 "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid,
2934 app->gid, app->sock, app->name, app->notify_sock, app->v_major,
2935 app->v_minor);
5b4a0ec0 2936
d0b96690
DG
2937 rcu_read_unlock();
2938}
2939
d88aee68
DG
2940/*
2941 * Set the application version into the object.
2942 *
2943 * Return 0 on success else a negative value either an errno code or a
2944 * LTTng-UST error code.
2945 */
d0b96690
DG
2946int ust_app_version(struct ust_app *app)
2947{
d88aee68
DG
2948 int ret;
2949
d0b96690 2950 assert(app);
d88aee68
DG
2951
2952 ret = ustctl_tracer_version(app->sock, &app->version);
2953 if (ret < 0) {
2954 if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
2955 ERR("UST app %d verson failed with ret %d", app->sock, ret);
2956 } else {
2957 DBG3("UST app %d verion failed. Application is dead", app->sock);
2958 }
2959 }
2960
2961 return ret;
5b4a0ec0
DG
2962}
2963
2964/*
2965 * Unregister app by removing it from the global traceable app list and freeing
2966 * the data struct.
2967 *
2968 * The socket is already closed at this point so no close to sock.
2969 */
2970void ust_app_unregister(int sock)
2971{
2972 struct ust_app *lta;
bec39940
DG
2973 struct lttng_ht_node_ulong *node;
2974 struct lttng_ht_iter iter;
d42f20df 2975 struct ust_app_session *ua_sess;
525b0740 2976 int ret;
5b4a0ec0
DG
2977
2978 rcu_read_lock();
886459c6 2979
5b4a0ec0 2980 /* Get the node reference for a call_rcu */
852d0037 2981 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 2982 node = lttng_ht_iter_get_node_ulong(&iter);
d0b96690 2983 assert(node);
284d8f55 2984
852d0037 2985 lta = caa_container_of(node, struct ust_app, sock_n);
852d0037
DG
2986 DBG("PID %d unregistering with sock %d", lta->pid, sock);
2987
886459c6 2988 /* Remove application from PID hash table */
852d0037
DG
2989 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
2990 assert(!ret);
2991
d88aee68
DG
2992 /*
2993 * Remove application from notify hash table. The thread handling the
2994 * notify socket could have deleted the node so ignore on error because
2995 * either way it's valid. The close of that socket is handled by the other
2996 * thread.
2997 */
d0b96690 2998 iter.iter.node = &lta->notify_sock_n.node;
d88aee68 2999 (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
852d0037 3000
5b98a774
DG
3001 /*
3002 * Ignore return value since the node might have been removed before by an
3003 * add replace during app registration because the PID can be reassigned by
3004 * the OS.
3005 */
d0b96690 3006 iter.iter.node = &lta->pid_n.node;
bec39940 3007 ret = lttng_ht_del(ust_app_ht, &iter);
5b98a774
DG
3008 if (ret) {
3009 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
3010 lta->pid);
3011 }
852d0037 3012
d42f20df
DG
3013 /* Remove sessions so they are not visible during deletion.*/
3014 cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess,
3015 node.node) {
7972aab2
DG
3016 struct ust_registry_session *registry;
3017
d42f20df
DG
3018 ret = lttng_ht_del(lta->sessions, &iter);
3019 if (ret) {
3020 /* The session was already removed so scheduled for teardown. */
3021 continue;
3022 }
3023
3024 /*
3025 * Add session to list for teardown. This is safe since at this point we
3026 * are the only one using this list.
3027 */
d88aee68
DG
3028 pthread_mutex_lock(&ua_sess->lock);
3029
3030 /*
3031 * Normally, this is done in the delete session process which is
3032 * executed in the call rcu below. However, upon registration we can't
3033 * afford to wait for the grace period before pushing data or else the
3034 * data pending feature can race between the unregistration and stop
3035 * command where the data pending command is sent *before* the grace
3036 * period ended.
3037 *
3038 * The close metadata below nullifies the metadata pointer in the
3039 * session so the delete session will NOT push/close a second time.
3040 */
7972aab2 3041 registry = get_session_registry(ua_sess);
1b532a60 3042 if (registry && !registry->metadata_closed) {
7972aab2
DG
3043 /* Push metadata for application before freeing the application. */
3044 (void) push_metadata(registry, ua_sess->consumer);
3045
3046 /*
3047 * Don't ask to close metadata for global per UID buffers. Close
1b532a60
DG
3048 * metadata only on destroy trace session in this case. Also, the
3049 * previous push metadata could have flag the metadata registry to
3050 * close so don't send a close command if closed.
7972aab2 3051 */
1b532a60
DG
3052 if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID &&
3053 !registry->metadata_closed) {
7972aab2
DG
3054 /* And ask to close it for this session registry. */
3055 (void) close_metadata(registry, ua_sess->consumer);
3056 }
3057 }
d88aee68 3058
d42f20df 3059 cds_list_add(&ua_sess->teardown_node, &lta->teardown_head);
d88aee68 3060 pthread_mutex_unlock(&ua_sess->lock);
d42f20df
DG
3061 }
3062
852d0037
DG
3063 /* Free memory */
3064 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
3065
5b4a0ec0
DG
3066 rcu_read_unlock();
3067 return;
284d8f55
DG
3068}
3069
3070/*
5b4a0ec0 3071 * Return traceable_app_count
284d8f55 3072 */
5b4a0ec0 3073unsigned long ust_app_list_count(void)
284d8f55 3074{
5b4a0ec0 3075 unsigned long count;
284d8f55 3076
5b4a0ec0 3077 rcu_read_lock();
bec39940 3078 count = lttng_ht_get_count(ust_app_ht);
5b4a0ec0 3079 rcu_read_unlock();
284d8f55 3080
5b4a0ec0 3081 return count;
284d8f55
DG
3082}
3083
5b4a0ec0
DG
3084/*
3085 * Fill events array with all events name of all registered apps.
3086 */
3087int ust_app_list_events(struct lttng_event **events)
421cb601 3088{
5b4a0ec0
DG
3089 int ret, handle;
3090 size_t nbmem, count = 0;
bec39940 3091 struct lttng_ht_iter iter;
5b4a0ec0 3092 struct ust_app *app;
c617c0c6 3093 struct lttng_event *tmp_event;
421cb601 3094
5b4a0ec0 3095 nbmem = UST_APP_EVENT_LIST_SIZE;
c617c0c6
MD
3096 tmp_event = zmalloc(nbmem * sizeof(struct lttng_event));
3097 if (tmp_event == NULL) {
5b4a0ec0
DG
3098 PERROR("zmalloc ust app events");
3099 ret = -ENOMEM;
421cb601
DG
3100 goto error;
3101 }
3102
5b4a0ec0 3103 rcu_read_lock();
421cb601 3104
852d0037 3105 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
90eaa0d2 3106 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 3107
840cb59c 3108 health_code_update();
86acf0da 3109
e0c7ec2b
DG
3110 if (!app->compatible) {
3111 /*
3112 * TODO: In time, we should notice the caller of this error by
3113 * telling him that this is a version error.
3114 */
3115 continue;
3116 }
852d0037 3117 handle = ustctl_tracepoint_list(app->sock);
5b4a0ec0 3118 if (handle < 0) {
ffe60014
DG
3119 if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) {
3120 ERR("UST app list events getting handle failed for app pid %d",
3121 app->pid);
3122 }
5b4a0ec0
DG
3123 continue;
3124 }
421cb601 3125
852d0037 3126 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
fb54cdbf 3127 &uiter)) != -LTTNG_UST_ERR_NOENT) {
ffe60014
DG
3128 /* Handle ustctl error. */
3129 if (ret < 0) {
3130 free(tmp_event);
3131 if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) {
3132 ERR("UST app tp list get failed for app %d with ret %d",
3133 app->sock, ret);
3134 } else {
3135 DBG3("UST app tp list get failed. Application is dead");
3757b385
DG
3136 /*
3137 * This is normal behavior, an application can die during the
3138 * creation process. Don't report an error so the execution can
3139 * continue normally. Continue normal execution.
3140 */
3141 break;
ffe60014
DG
3142 }
3143 goto rcu_error;
3144 }
3145
840cb59c 3146 health_code_update();
815564d8 3147 if (count >= nbmem) {
d7b3776f 3148 /* In case the realloc fails, we free the memory */
c617c0c6
MD
3149 void *ptr;
3150
815564d8
MD
3151 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
3152 2 * nbmem);
3153 nbmem *= 2;
c617c0c6
MD
3154 ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event));
3155 if (ptr == NULL) {
5b4a0ec0 3156 PERROR("realloc ust app events");
c617c0c6 3157 free(tmp_event);
5b4a0ec0
DG
3158 ret = -ENOMEM;
3159 goto rcu_error;
3160 }
c617c0c6 3161 tmp_event = ptr;
5b4a0ec0 3162 }
c617c0c6
MD
3163 memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
3164 tmp_event[count].loglevel = uiter.loglevel;
3165 tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
3166 tmp_event[count].pid = app->pid;
3167 tmp_event[count].enabled = -1;
5b4a0ec0 3168 count++;
421cb601 3169 }
421cb601
DG
3170 }
3171
5b4a0ec0 3172 ret = count;
c617c0c6 3173 *events = tmp_event;
421cb601 3174
5b4a0ec0 3175 DBG2("UST app list events done (%zu events)", count);
421cb601 3176
5b4a0ec0
DG
3177rcu_error:
3178 rcu_read_unlock();
421cb601 3179error:
840cb59c 3180 health_code_update();
5b4a0ec0 3181 return ret;
421cb601
DG
3182}
3183
f37d259d
MD
3184/*
3185 * Fill events array with all events name of all registered apps.
3186 */
3187int ust_app_list_event_fields(struct lttng_event_field **fields)
3188{
3189 int ret, handle;
3190 size_t nbmem, count = 0;
3191 struct lttng_ht_iter iter;
3192 struct ust_app *app;
c617c0c6 3193 struct lttng_event_field *tmp_event;
f37d259d
MD
3194
3195 nbmem = UST_APP_EVENT_LIST_SIZE;
c617c0c6
MD
3196 tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field));
3197 if (tmp_event == NULL) {
f37d259d
MD
3198 PERROR("zmalloc ust app event fields");
3199 ret = -ENOMEM;
3200 goto error;
3201 }
3202
3203 rcu_read_lock();
3204
3205 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
3206 struct lttng_ust_field_iter uiter;
3207
840cb59c 3208 health_code_update();
86acf0da 3209
f37d259d
MD
3210 if (!app->compatible) {
3211 /*
3212 * TODO: In time, we should notice the caller of this error by
3213 * telling him that this is a version error.
3214 */
3215 continue;
3216 }
3217 handle = ustctl_tracepoint_field_list(app->sock);
3218 if (handle < 0) {
ffe60014
DG
3219 if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) {
3220 ERR("UST app list field getting handle failed for app pid %d",
3221 app->pid);
3222 }
f37d259d
MD
3223 continue;
3224 }
3225
3226 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
fb54cdbf 3227 &uiter)) != -LTTNG_UST_ERR_NOENT) {
ffe60014
DG
3228 /* Handle ustctl error. */
3229 if (ret < 0) {
3230 free(tmp_event);
3231 if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) {
3232 ERR("UST app tp list field failed for app %d with ret %d",
3233 app->sock, ret);
3234 } else {
3235 DBG3("UST app tp list field failed. Application is dead");
3757b385
DG
3236 /*
3237 * This is normal behavior, an application can die during the
3238 * creation process. Don't report an error so the execution can
3239 * continue normally.
3240 */
3241 break;
ffe60014
DG
3242 }
3243 goto rcu_error;
3244 }
3245
840cb59c 3246 health_code_update();
f37d259d 3247 if (count >= nbmem) {
d7b3776f 3248 /* In case the realloc fails, we free the memory */
c617c0c6
MD
3249 void *ptr;
3250
f37d259d
MD
3251 DBG2("Reallocating event field list from %zu to %zu entries", nbmem,
3252 2 * nbmem);
3253 nbmem *= 2;
c617c0c6
MD
3254 ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field));
3255 if (ptr == NULL) {
f37d259d 3256 PERROR("realloc ust app event fields");
c617c0c6 3257 free(tmp_event);
f37d259d
MD
3258 ret = -ENOMEM;
3259 goto rcu_error;
3260 }
c617c0c6 3261 tmp_event = ptr;
f37d259d 3262 }
f37d259d 3263
c617c0c6 3264 memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
2e84128e
DG
3265 /* Mapping between these enums matches 1 to 1. */
3266 tmp_event[count].type = (enum lttng_event_field_type) uiter.type;
c617c0c6 3267 tmp_event[count].nowrite = uiter.nowrite;
f37d259d 3268
c617c0c6
MD
3269 memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
3270 tmp_event[count].event.loglevel = uiter.loglevel;
2e84128e 3271 tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT;
c617c0c6
MD
3272 tmp_event[count].event.pid = app->pid;
3273 tmp_event[count].event.enabled = -1;
f37d259d
MD
3274 count++;
3275 }
3276 }
3277
3278 ret = count;
c617c0c6 3279 *fields = tmp_event;
f37d259d
MD
3280
3281 DBG2("UST app list event fields done (%zu events)", count);
3282
3283rcu_error:
3284 rcu_read_unlock();
3285error:
840cb59c 3286 health_code_update();
f37d259d
MD
3287 return ret;
3288}
3289
5b4a0ec0
DG
3290/*
3291 * Free and clean all traceable apps of the global list.
36b588ed
MD
3292 *
3293 * Should _NOT_ be called with RCU read-side lock held.
5b4a0ec0
DG
3294 */
3295void ust_app_clean_list(void)
421cb601 3296{
5b4a0ec0 3297 int ret;
659ed79f 3298 struct ust_app *app;
bec39940 3299 struct lttng_ht_iter iter;
421cb601 3300
5b4a0ec0 3301 DBG2("UST app cleaning registered apps hash table");
421cb601 3302
5b4a0ec0 3303 rcu_read_lock();
421cb601 3304
659ed79f 3305 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 3306 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 3307 assert(!ret);
659ed79f 3308 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
421cb601
DG
3309 }
3310
852d0037 3311 /* Cleanup socket hash table */
659ed79f
DG
3312 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app,
3313 sock_n.node) {
852d0037 3314 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
bec39940
DG
3315 assert(!ret);
3316 }
852d0037 3317
d88aee68
DG
3318 /* Cleanup notify socket hash table */
3319 cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app,
3320 notify_sock_n.node) {
3321 ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
3322 assert(!ret);
3323 }
36b588ed 3324 rcu_read_unlock();
d88aee68 3325
bec39940 3326 /* Destroy is done only when the ht is empty */
0b2dc8df
MD
3327 ht_cleanup_push(ust_app_ht);
3328 ht_cleanup_push(ust_app_ht_by_sock);
3329 ht_cleanup_push(ust_app_ht_by_notify_sock);
5b4a0ec0
DG
3330}
3331
3332/*
3333 * Init UST app hash table.
3334 */
3335void ust_app_ht_alloc(void)
3336{
bec39940 3337 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
852d0037 3338 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
d0b96690 3339 ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
421cb601
DG
3340}
3341
78f0bacd
DG
3342/*
3343 * For a specific UST session, disable the channel for all registered apps.
3344 */
35a9059d 3345int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
3346 struct ltt_ust_channel *uchan)
3347{
3348 int ret = 0;
bec39940
DG
3349 struct lttng_ht_iter iter;
3350 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
3351 struct ust_app *app;
3352 struct ust_app_session *ua_sess;
8535a6d9 3353 struct ust_app_channel *ua_chan;
78f0bacd
DG
3354
3355 if (usess == NULL || uchan == NULL) {
3356 ERR("Disabling UST global channel with NULL values");
3357 ret = -1;
3358 goto error;
3359 }
3360
d9bf3ca4 3361 DBG2("UST app disabling channel %s from global domain for session id %" PRIu64,
a991f516 3362 uchan->name, usess->id);
78f0bacd
DG
3363
3364 rcu_read_lock();
3365
3366 /* For every registered applications */
852d0037 3367 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 3368 struct lttng_ht_iter uiter;
e0c7ec2b
DG
3369 if (!app->compatible) {
3370 /*
3371 * TODO: In time, we should notice the caller of this error by
3372 * telling him that this is a version error.
3373 */
3374 continue;
3375 }
78f0bacd
DG
3376 ua_sess = lookup_session_by_app(usess, app);
3377 if (ua_sess == NULL) {
3378 continue;
3379 }
3380
8535a6d9 3381 /* Get channel */
bec39940
DG
3382 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
3383 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9
DG
3384 /* If the session if found for the app, the channel must be there */
3385 assert(ua_chan_node);
3386
3387 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
3388 /* The channel must not be already disabled */
3389 assert(ua_chan->enabled == 1);
3390
3391 /* Disable channel onto application */
3392 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
3393 if (ret < 0) {
3394 /* XXX: We might want to report this error at some point... */
3395 continue;
3396 }
3397 }
3398
3399 rcu_read_unlock();
3400
3401error:
3402 return ret;
3403}
3404
3405/*
3406 * For a specific UST session, enable the channel for all registered apps.
3407 */
35a9059d 3408int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
3409 struct ltt_ust_channel *uchan)
3410{
3411 int ret = 0;
bec39940 3412 struct lttng_ht_iter iter;
78f0bacd
DG
3413 struct ust_app *app;
3414 struct ust_app_session *ua_sess;
3415
3416 if (usess == NULL || uchan == NULL) {
3417 ERR("Adding UST global channel to NULL values");
3418 ret = -1;
3419 goto error;
3420 }
3421
d9bf3ca4 3422 DBG2("UST app enabling channel %s to global domain for session id %" PRIu64,
a991f516 3423 uchan->name, usess->id);
78f0bacd
DG
3424
3425 rcu_read_lock();
3426
3427 /* For every registered applications */
852d0037 3428 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
3429 if (!app->compatible) {
3430 /*
3431 * TODO: In time, we should notice the caller of this error by
3432 * telling him that this is a version error.
3433 */
3434 continue;
3435 }
78f0bacd
DG
3436 ua_sess = lookup_session_by_app(usess, app);
3437 if (ua_sess == NULL) {
3438 continue;
3439 }
3440
3441 /* Enable channel onto application */
3442 ret = enable_ust_app_channel(ua_sess, uchan, app);
3443 if (ret < 0) {
3444 /* XXX: We might want to report this error at some point... */
3445 continue;
3446 }
3447 }
3448
3449 rcu_read_unlock();
3450
3451error:
3452 return ret;
3453}
3454
b0a40d28
DG
3455/*
3456 * Disable an event in a channel and for a specific session.
3457 */
35a9059d
DG
3458int ust_app_disable_event_glb(struct ltt_ust_session *usess,
3459 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
b0a40d28
DG
3460{
3461 int ret = 0;
bec39940
DG
3462 struct lttng_ht_iter iter, uiter;
3463 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
b0a40d28
DG
3464 struct ust_app *app;
3465 struct ust_app_session *ua_sess;
3466 struct ust_app_channel *ua_chan;
3467 struct ust_app_event *ua_event;
3468
3469 DBG("UST app disabling event %s for all apps in channel "
d9bf3ca4
MD
3470 "%s for session id %" PRIu64,
3471 uevent->attr.name, uchan->name, usess->id);
b0a40d28
DG
3472
3473 rcu_read_lock();
3474
3475 /* For all registered applications */
852d0037 3476 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
3477 if (!app->compatible) {
3478 /*
3479 * TODO: In time, we should notice the caller of this error by
3480 * telling him that this is a version error.
3481 */
3482 continue;
3483 }
b0a40d28
DG
3484 ua_sess = lookup_session_by_app(usess, app);
3485 if (ua_sess == NULL) {
3486 /* Next app */
3487 continue;
3488 }
3489
3490 /* Lookup channel in the ust app session */
bec39940
DG
3491 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
3492 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28 3493 if (ua_chan_node == NULL) {
d9bf3ca4 3494 DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d."
852d0037 3495 "Skipping", uchan->name, usess->id, app->pid);
b0a40d28
DG
3496 continue;
3497 }
3498 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
3499
bec39940
DG
3500 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
3501 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28
DG
3502 if (ua_event_node == NULL) {
3503 DBG2("Event %s not found in channel %s for app pid %d."
852d0037 3504 "Skipping", uevent->attr.name, uchan->name, app->pid);
b0a40d28
DG
3505 continue;
3506 }
3507 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
3508
7f79d3a1 3509 ret = disable_ust_app_event(ua_sess, ua_event, app);
b0a40d28
DG
3510 if (ret < 0) {
3511 /* XXX: Report error someday... */
3512 continue;
3513 }
3514 }
3515
3516 rcu_read_unlock();
3517
3518 return ret;
3519}
3520
9730260e 3521/*
edb67388 3522 * For a specific UST session and UST channel, the event for all
9730260e
DG
3523 * registered apps.
3524 */
35a9059d 3525int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
9730260e
DG
3526 struct ltt_ust_channel *uchan)
3527{
3528 int ret = 0;
bec39940
DG
3529 struct lttng_ht_iter iter, uiter;
3530 struct lttng_ht_node_str *ua_chan_node;
9730260e
DG
3531 struct ust_app *app;
3532 struct ust_app_session *ua_sess;
3533 struct ust_app_channel *ua_chan;
3534 struct ust_app_event *ua_event;
3535
3536 DBG("UST app disabling all event for all apps in channel "
d9bf3ca4 3537 "%s for session id %" PRIu64, uchan->name, usess->id);
9730260e
DG
3538
3539 rcu_read_lock();
3540
3541 /* For all registered applications */
852d0037 3542 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
3543 if (!app->compatible) {
3544 /*
3545 * TODO: In time, we should notice the caller of this error by
3546 * telling him that this is a version error.
3547 */
3548 continue;
3549 }
9730260e 3550 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
3551 if (!ua_sess) {
3552 /* The application has problem or is probably dead. */
3553 continue;
3554 }
9730260e
DG
3555
3556 /* Lookup channel in the ust app session */
bec39940
DG
3557 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
3558 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
3559 /* If the channel is not found, there is a code flow error */
3560 assert(ua_chan_node);
3561
9730260e
DG
3562 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
3563
3564 /* Disable each events of channel */
bec39940
DG
3565 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
3566 node.node) {
7f79d3a1 3567 ret = disable_ust_app_event(ua_sess, ua_event, app);
9730260e
DG
3568 if (ret < 0) {
3569 /* XXX: Report error someday... */
3570 continue;
3571 }
3572 }
3573 }
3574
3575 rcu_read_unlock();
3576
3577 return ret;
3578}
3579
421cb601 3580/*
5b4a0ec0 3581 * For a specific UST session, create the channel for all registered apps.
421cb601 3582 */
35a9059d 3583int ust_app_create_channel_glb(struct ltt_ust_session *usess,
48842b30
DG
3584 struct ltt_ust_channel *uchan)
3585{
3d8ca23b 3586 int ret = 0, created;
bec39940 3587 struct lttng_ht_iter iter;
48842b30 3588 struct ust_app *app;
3d8ca23b 3589 struct ust_app_session *ua_sess = NULL;
48842b30 3590
fc34caaa
DG
3591 /* Very wrong code flow */
3592 assert(usess);
3593 assert(uchan);
421cb601 3594
d9bf3ca4 3595 DBG2("UST app adding channel %s to UST domain for session id %" PRIu64,
a991f516 3596 uchan->name, usess->id);
48842b30
DG
3597
3598 rcu_read_lock();
421cb601 3599
5b4a0ec0 3600 /* For every registered applications */
852d0037 3601 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
3602 if (!app->compatible) {
3603 /*
3604 * TODO: In time, we should notice the caller of this error by
3605 * telling him that this is a version error.
3606 */
3607 continue;
3608 }
edb67388
DG
3609 /*
3610 * Create session on the tracer side and add it to app session HT. Note
3611 * that if session exist, it will simply return a pointer to the ust
3612 * app session.
3613 */
3d8ca23b
DG
3614 ret = create_ust_app_session(usess, app, &ua_sess, &created);
3615 if (ret < 0) {
3616 switch (ret) {
3617 case -ENOTCONN:
3618 /*
3619 * The application's socket is not valid. Either a bad socket
3620 * or a timeout on it. We can't inform the caller that for a
3621 * specific app, the session failed so lets continue here.
3622 */
3623 continue;
3624 case -ENOMEM:
3625 default:
3626 goto error_rcu_unlock;
3627 }
48842b30 3628 }
3d8ca23b 3629 assert(ua_sess);
48842b30 3630
d0b96690 3631 pthread_mutex_lock(&ua_sess->lock);
d65d2de8
DG
3632 if (!strncmp(uchan->name, DEFAULT_METADATA_NAME,
3633 sizeof(uchan->name))) {
3634 struct ustctl_consumer_channel_attr attr;
3635 copy_channel_attr_to_ustctl(&attr, &uchan->attr);
3636 ret = create_ust_app_metadata(ua_sess, app, usess->consumer,
3637 &attr);
3638 } else {
3639 /* Create channel onto application. We don't need the chan ref. */
3640 ret = create_ust_app_channel(ua_sess, uchan, app,
3641 LTTNG_UST_CHAN_PER_CPU, usess, NULL);
3642 }
d0b96690 3643 pthread_mutex_unlock(&ua_sess->lock);
3d8ca23b
DG
3644 if (ret < 0) {
3645 if (ret == -ENOMEM) {
3646 /* No more memory is a fatal error. Stop right now. */
3647 goto error_rcu_unlock;
3648 }
3649 /* Cleanup the created session if it's the case. */
3650 if (created) {
d0b96690 3651 destroy_app_session(app, ua_sess);
3d8ca23b 3652 }
48842b30 3653 }
48842b30 3654 }
5b4a0ec0 3655
95e047ff 3656error_rcu_unlock:
48842b30 3657 rcu_read_unlock();
3c14c33f 3658 return ret;
48842b30
DG
3659}
3660
5b4a0ec0 3661/*
edb67388 3662 * Enable event for a specific session and channel on the tracer.
5b4a0ec0 3663 */
35a9059d 3664int ust_app_enable_event_glb(struct ltt_ust_session *usess,
48842b30
DG
3665 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
3666{
3667 int ret = 0;
bec39940 3668 struct lttng_ht_iter iter, uiter;
18eace3b 3669 struct lttng_ht_node_str *ua_chan_node;
48842b30
DG
3670 struct ust_app *app;
3671 struct ust_app_session *ua_sess;
3672 struct ust_app_channel *ua_chan;
3673 struct ust_app_event *ua_event;
48842b30 3674
d9bf3ca4 3675 DBG("UST app enabling event %s for all apps for session id %" PRIu64,
a991f516 3676 uevent->attr.name, usess->id);
48842b30 3677
edb67388
DG
3678 /*
3679 * NOTE: At this point, this function is called only if the session and
3680 * channel passed are already created for all apps. and enabled on the
3681 * tracer also.
3682 */
3683
48842b30 3684 rcu_read_lock();
421cb601
DG
3685
3686 /* For all registered applications */
852d0037 3687 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
3688 if (!app->compatible) {
3689 /*
3690 * TODO: In time, we should notice the caller of this error by
3691 * telling him that this is a version error.
3692 */
3693 continue;
3694 }
edb67388 3695 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
3696 if (!ua_sess) {
3697 /* The application has problem or is probably dead. */
3698 continue;
3699 }
ba767faf 3700
d0b96690
DG
3701 pthread_mutex_lock(&ua_sess->lock);
3702
edb67388 3703 /* Lookup channel in the ust app session */
bec39940
DG
3704 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
3705 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
3706 /* If the channel is not found, there is a code flow error */
3707 assert(ua_chan_node);
3708
3709 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
3710
18eace3b
DG
3711 /* Get event node */
3712 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
39c5a3a7 3713 uevent->filter, uevent->attr.loglevel, uevent->exclusion);
18eace3b 3714 if (ua_event == NULL) {
7f79d3a1 3715 DBG3("UST app enable event %s not found for app PID %d."
852d0037 3716 "Skipping app", uevent->attr.name, app->pid);
d0b96690 3717 goto next_app;
35a9059d 3718 }
35a9059d
DG
3719
3720 ret = enable_ust_app_event(ua_sess, ua_event, app);
3721 if (ret < 0) {
d0b96690 3722 pthread_mutex_unlock(&ua_sess->lock);
7f79d3a1 3723 goto error;
48842b30 3724 }
d0b96690
DG
3725 next_app:
3726 pthread_mutex_unlock(&ua_sess->lock);
edb67388
DG
3727 }
3728
7f79d3a1 3729error:
edb67388 3730 rcu_read_unlock();
edb67388
DG
3731 return ret;
3732}
3733
3734/*
3735 * For a specific existing UST session and UST channel, creates the event for
3736 * all registered apps.
3737 */
35a9059d 3738int ust_app_create_event_glb(struct ltt_ust_session *usess,
edb67388
DG
3739 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
3740{
3741 int ret = 0;
bec39940
DG
3742 struct lttng_ht_iter iter, uiter;
3743 struct lttng_ht_node_str *ua_chan_node;
edb67388
DG
3744 struct ust_app *app;
3745 struct ust_app_session *ua_sess;
3746 struct ust_app_channel *ua_chan;
3747
d9bf3ca4 3748 DBG("UST app creating event %s for all apps for session id %" PRIu64,
a991f516 3749 uevent->attr.name, usess->id);
edb67388 3750
edb67388
DG
3751 rcu_read_lock();
3752
3753 /* For all registered applications */
852d0037 3754 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
3755 if (!app->compatible) {
3756 /*
3757 * TODO: In time, we should notice the caller of this error by
3758 * telling him that this is a version error.
3759 */
3760 continue;
3761 }
edb67388 3762 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
3763 if (!ua_sess) {
3764 /* The application has problem or is probably dead. */
3765 continue;
3766 }
48842b30 3767
d0b96690 3768 pthread_mutex_lock(&ua_sess->lock);
48842b30 3769 /* Lookup channel in the ust app session */
bec39940
DG
3770 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
3771 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
3772 /* If the channel is not found, there is a code flow error */
3773 assert(ua_chan_node);
3774
48842b30
DG
3775 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
3776
edb67388 3777 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
d0b96690 3778 pthread_mutex_unlock(&ua_sess->lock);
edb67388 3779 if (ret < 0) {
49c336c1 3780 if (ret != -LTTNG_UST_ERR_EXIST) {
fc34caaa
DG
3781 /* Possible value at this point: -ENOMEM. If so, we stop! */
3782 break;
3783 }
3784 DBG2("UST app event %s already exist on app PID %d",
852d0037 3785 uevent->attr.name, app->pid);
5b4a0ec0 3786 continue;
48842b30 3787 }
48842b30 3788 }
5b4a0ec0 3789
48842b30
DG
3790 rcu_read_unlock();
3791
3792 return ret;
3793}
3794
5b4a0ec0
DG
3795/*
3796 * Start tracing for a specific UST session and app.
3797 */
b34cbebf 3798static
421cb601 3799int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
48842b30
DG
3800{
3801 int ret = 0;
48842b30 3802 struct ust_app_session *ua_sess;
48842b30 3803
852d0037 3804 DBG("Starting tracing for ust app pid %d", app->pid);
5cf5d0e7 3805
509cbaf8
MD
3806 rcu_read_lock();
3807
e0c7ec2b
DG
3808 if (!app->compatible) {
3809 goto end;
3810 }
3811
421cb601
DG
3812 ua_sess = lookup_session_by_app(usess, app);
3813 if (ua_sess == NULL) {
d42f20df
DG
3814 /* The session is in teardown process. Ignore and continue. */
3815 goto end;
421cb601 3816 }
48842b30 3817
d0b96690
DG
3818 pthread_mutex_lock(&ua_sess->lock);
3819
aea829b3
DG
3820 /* Upon restart, we skip the setup, already done */
3821 if (ua_sess->started) {
8be98f9a 3822 goto skip_setup;
aea829b3 3823 }
8be98f9a 3824
a4b92340
DG
3825 /* Create directories if consumer is LOCAL and has a path defined. */
3826 if (usess->consumer->type == CONSUMER_DST_LOCAL &&
3827 strlen(usess->consumer->dst.trace_path) > 0) {
3828 ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path,
7972aab2 3829 S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid);
a4b92340
DG
3830 if (ret < 0) {
3831 if (ret != -EEXIST) {
3832 ERR("Trace directory creation error");
d0b96690 3833 goto error_unlock;
421cb601 3834 }
173af62f 3835 }
7753dea8 3836 }
aea829b3 3837
d65d2de8
DG
3838 /*
3839 * Create the metadata for the application. This returns gracefully if a
3840 * metadata was already set for the session.
3841 */
3842 ret = create_ust_app_metadata(ua_sess, app, usess->consumer, NULL);
421cb601 3843 if (ret < 0) {
d0b96690 3844 goto error_unlock;
421cb601 3845 }
48842b30 3846
840cb59c 3847 health_code_update();
86acf0da 3848
8be98f9a 3849skip_setup:
421cb601 3850 /* This start the UST tracing */
852d0037 3851 ret = ustctl_start_session(app->sock, ua_sess->handle);
421cb601 3852 if (ret < 0) {
ffe60014
DG
3853 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
3854 ERR("Error starting tracing for app pid: %d (ret: %d)",
3855 app->pid, ret);
3856 } else {
3857 DBG("UST app start session failed. Application is dead.");
3757b385
DG
3858 /*
3859 * This is normal behavior, an application can die during the
3860 * creation process. Don't report an error so the execution can
3861 * continue normally.
3862 */
3863 pthread_mutex_unlock(&ua_sess->lock);
3864 goto end;
ffe60014 3865 }
d0b96690 3866 goto error_unlock;
421cb601 3867 }
5b4a0ec0 3868
55c3953d
DG
3869 /* Indicate that the session has been started once */
3870 ua_sess->started = 1;
3871
d0b96690
DG
3872 pthread_mutex_unlock(&ua_sess->lock);
3873
840cb59c 3874 health_code_update();
86acf0da 3875
421cb601 3876 /* Quiescent wait after starting trace */
ffe60014
DG
3877 ret = ustctl_wait_quiescent(app->sock);
3878 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
3879 ERR("UST app wait quiescent failed for app pid %d ret %d",
3880 app->pid, ret);
3881 }
48842b30 3882
e0c7ec2b
DG
3883end:
3884 rcu_read_unlock();
840cb59c 3885 health_code_update();
421cb601 3886 return 0;
48842b30 3887
d0b96690
DG
3888error_unlock:
3889 pthread_mutex_unlock(&ua_sess->lock);
509cbaf8 3890 rcu_read_unlock();
840cb59c 3891 health_code_update();
421cb601
DG
3892 return -1;
3893}
48842b30 3894
8be98f9a
MD
3895/*
3896 * Stop tracing for a specific UST session and app.
3897 */
b34cbebf 3898static
8be98f9a
MD
3899int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
3900{
3901 int ret = 0;
3902 struct ust_app_session *ua_sess;
7972aab2 3903 struct ust_registry_session *registry;
8be98f9a 3904
852d0037 3905 DBG("Stopping tracing for ust app pid %d", app->pid);
8be98f9a
MD
3906
3907 rcu_read_lock();
3908
e0c7ec2b 3909 if (!app->compatible) {
d88aee68 3910 goto end_no_session;
e0c7ec2b
DG
3911 }
3912
8be98f9a
MD
3913 ua_sess = lookup_session_by_app(usess, app);
3914 if (ua_sess == NULL) {
d88aee68 3915 goto end_no_session;
8be98f9a
MD
3916 }
3917
d88aee68
DG
3918 pthread_mutex_lock(&ua_sess->lock);
3919
9bc07046
DG
3920 /*
3921 * If started = 0, it means that stop trace has been called for a session
c45536e1
DG
3922 * that was never started. It's possible since we can have a fail start
3923 * from either the application manager thread or the command thread. Simply
3924 * indicate that this is a stop error.
9bc07046 3925 */
f9dfc3d9 3926 if (!ua_sess->started) {
c45536e1
DG
3927 goto error_rcu_unlock;
3928 }
7db205b5 3929
840cb59c 3930 health_code_update();
86acf0da 3931
9d6c7d3f 3932 /* This inhibits UST tracing */
852d0037 3933 ret = ustctl_stop_session(app->sock, ua_sess->handle);
9d6c7d3f 3934 if (ret < 0) {
ffe60014
DG
3935 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
3936 ERR("Error stopping tracing for app pid: %d (ret: %d)",
3937 app->pid, ret);
3938 } else {
3939 DBG("UST app stop session failed. Application is dead.");
3757b385
DG
3940 /*
3941 * This is normal behavior, an application can die during the
3942 * creation process. Don't report an error so the execution can
3943 * continue normally.
3944 */
3945 goto end_unlock;
ffe60014 3946 }
9d6c7d3f
DG
3947 goto error_rcu_unlock;
3948 }
3949
840cb59c 3950 health_code_update();
86acf0da 3951
9d6c7d3f 3952 /* Quiescent wait after stopping trace */
ffe60014
DG
3953 ret = ustctl_wait_quiescent(app->sock);
3954 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
3955 ERR("UST app wait quiescent failed for app pid %d ret %d",
3956 app->pid, ret);
3957 }
9d6c7d3f 3958
840cb59c 3959 health_code_update();
86acf0da 3960
b34cbebf
MD
3961 registry = get_session_registry(ua_sess);
3962 assert(registry);
1b532a60
DG
3963
3964 if (!registry->metadata_closed) {
3965 /* Push metadata for application before freeing the application. */
3966 (void) push_metadata(registry, ua_sess->consumer);
3967 }
b34cbebf 3968
3757b385 3969end_unlock:
b34cbebf
MD
3970 pthread_mutex_unlock(&ua_sess->lock);
3971end_no_session:
3972 rcu_read_unlock();
3973 health_code_update();
3974 return 0;
3975
3976error_rcu_unlock:
3977 pthread_mutex_unlock(&ua_sess->lock);
3978 rcu_read_unlock();
3979 health_code_update();
3980 return -1;
3981}
3982
3983/*
3984 * Flush buffers for a specific UST session and app.
3985 */
3986static
3987int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app)
3988{
3989 int ret = 0;
3990 struct lttng_ht_iter iter;
3991 struct ust_app_session *ua_sess;
3992 struct ust_app_channel *ua_chan;
3993
3994 DBG("Flushing buffers for ust app pid %d", app->pid);
3995
3996 rcu_read_lock();
3997
3998 if (!app->compatible) {
3999 goto end_no_session;
4000 }
4001
4002 ua_sess = lookup_session_by_app(usess, app);
4003 if (ua_sess == NULL) {
4004 goto end_no_session;
4005 }
4006
4007 pthread_mutex_lock(&ua_sess->lock);
4008
4009 health_code_update();
4010
9d6c7d3f 4011 /* Flushing buffers */
bec39940
DG
4012 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
4013 node.node) {
840cb59c 4014 health_code_update();
ffe60014 4015 assert(ua_chan->is_sent);
852d0037 4016 ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
8be98f9a 4017 if (ret < 0) {
ffe60014
DG
4018 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4019 ERR("UST app PID %d channel %s flush failed with ret %d",
4020 app->pid, ua_chan->name, ret);
4021 } else {
4022 DBG3("UST app failed to flush %s. Application is dead.",
4023 ua_chan->name);
3757b385
DG
4024 /*
4025 * This is normal behavior, an application can die during the
4026 * creation process. Don't report an error so the execution can
4027 * continue normally.
4028 */
ffe60014 4029 }
6d3686da
DG
4030 /* Continuing flushing all buffers */
4031 continue;
8be98f9a
MD
4032 }
4033 }
8be98f9a 4034
840cb59c 4035 health_code_update();
86acf0da 4036
d88aee68
DG
4037 pthread_mutex_unlock(&ua_sess->lock);
4038end_no_session:
7db205b5 4039 rcu_read_unlock();
840cb59c 4040 health_code_update();
8be98f9a 4041 return 0;
8be98f9a
MD
4042}
4043
84cd17c6
MD
4044/*
4045 * Destroy a specific UST session in apps.
4046 */
3353de95 4047static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
84cd17c6 4048{
ffe60014 4049 int ret;
84cd17c6 4050 struct ust_app_session *ua_sess;
bec39940 4051 struct lttng_ht_iter iter;
d9bf3ca4 4052 struct lttng_ht_node_u64 *node;
84cd17c6 4053
852d0037 4054 DBG("Destroy tracing for ust app pid %d", app->pid);
84cd17c6
MD
4055
4056 rcu_read_lock();
4057
e0c7ec2b
DG
4058 if (!app->compatible) {
4059 goto end;
4060 }
4061
84cd17c6 4062 __lookup_session_by_app(usess, app, &iter);
d9bf3ca4 4063 node = lttng_ht_iter_get_node_u64(&iter);
84cd17c6 4064 if (node == NULL) {
d42f20df
DG
4065 /* Session is being or is deleted. */
4066 goto end;
84cd17c6
MD
4067 }
4068 ua_sess = caa_container_of(node, struct ust_app_session, node);
c4a1715b 4069
840cb59c 4070 health_code_update();
d0b96690 4071 destroy_app_session(app, ua_sess);
84cd17c6 4072
840cb59c 4073 health_code_update();
7db205b5 4074
84cd17c6 4075 /* Quiescent wait after stopping trace */
ffe60014
DG
4076 ret = ustctl_wait_quiescent(app->sock);
4077 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4078 ERR("UST app wait quiescent failed for app pid %d ret %d",
4079 app->pid, ret);
4080 }
e0c7ec2b
DG
4081end:
4082 rcu_read_unlock();
840cb59c 4083 health_code_update();
84cd17c6 4084 return 0;
84cd17c6
MD
4085}
4086
5b4a0ec0
DG
4087/*
4088 * Start tracing for the UST session.
4089 */
421cb601
DG
4090int ust_app_start_trace_all(struct ltt_ust_session *usess)
4091{
4092 int ret = 0;
bec39940 4093 struct lttng_ht_iter iter;
421cb601 4094 struct ust_app *app;
48842b30 4095
421cb601
DG
4096 DBG("Starting all UST traces");
4097
4098 rcu_read_lock();
421cb601 4099
852d0037 4100 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
421cb601 4101 ret = ust_app_start_trace(usess, app);
48842b30 4102 if (ret < 0) {
5b4a0ec0
DG
4103 /* Continue to next apps even on error */
4104 continue;
48842b30 4105 }
48842b30 4106 }
5b4a0ec0 4107
48842b30
DG
4108 rcu_read_unlock();
4109
4110 return 0;
4111}
487cf67c 4112
8be98f9a
MD
4113/*
4114 * Start tracing for the UST session.
4115 */
4116int ust_app_stop_trace_all(struct ltt_ust_session *usess)
4117{
4118 int ret = 0;
bec39940 4119 struct lttng_ht_iter iter;
8be98f9a
MD
4120 struct ust_app *app;
4121
4122 DBG("Stopping all UST traces");
4123
4124 rcu_read_lock();
4125
b34cbebf
MD
4126 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4127 ret = ust_app_stop_trace(usess, app);
4128 if (ret < 0) {
4129 /* Continue to next apps even on error */
4130 continue;
4131 }
4132 }
4133
b0a5f0fb 4134 /* Flush buffers and push metadata (for UID buffers). */
b34cbebf
MD
4135 switch (usess->buffer_type) {
4136 case LTTNG_BUFFER_PER_UID:
4137 {
7972aab2 4138 struct buffer_reg_uid *reg;
b34cbebf
MD
4139
4140 /* Flush all per UID buffers associated to that session. */
7972aab2 4141 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
b0a5f0fb 4142 struct ust_registry_session *ust_session_reg;
7972aab2
DG
4143 struct buffer_reg_channel *reg_chan;
4144 struct consumer_socket *socket;
4145
4146 /* Get consumer socket to use to push the metadata.*/
4147 socket = consumer_find_socket_by_bitness(reg->bits_per_long,
4148 usess->consumer);
4149 if (!socket) {
4150 /* Ignore request if no consumer is found for the session. */
4151 continue;
4152 }
4153
4154 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
4155 reg_chan, node.node) {
4156 /*
4157 * The following call will print error values so the return
4158 * code is of little importance because whatever happens, we
4159 * have to try them all.
4160 */
4161 (void) consumer_flush_channel(socket, reg_chan->consumer_key);
4162 }
b0a5f0fb
MD
4163
4164 ust_session_reg = reg->registry->reg.ust;
4165 if (!ust_session_reg->metadata_closed) {
4166 /* Push metadata. */
4167 (void) push_metadata(ust_session_reg, usess->consumer);
4168 }
7972aab2 4169 }
b0a5f0fb 4170
b34cbebf 4171 break;
7972aab2 4172 }
b34cbebf
MD
4173 case LTTNG_BUFFER_PER_PID:
4174 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4175 ret = ust_app_flush_trace(usess, app);
4176 if (ret < 0) {
4177 /* Continue to next apps even on error */
4178 continue;
4179 }
8be98f9a 4180 }
b34cbebf
MD
4181 break;
4182 default:
4183 assert(0);
4184 break;
8be98f9a
MD
4185 }
4186
4187 rcu_read_unlock();
4188
4189 return 0;
4190}
4191
84cd17c6
MD
4192/*
4193 * Destroy app UST session.
4194 */
4195int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
4196{
4197 int ret = 0;
bec39940 4198 struct lttng_ht_iter iter;
84cd17c6
MD
4199 struct ust_app *app;
4200
4201 DBG("Destroy all UST traces");
4202
4203 rcu_read_lock();
4204
852d0037 4205 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
3353de95 4206 ret = destroy_trace(usess, app);
84cd17c6
MD
4207 if (ret < 0) {
4208 /* Continue to next apps even on error */
4209 continue;
4210 }
4211 }
4212
4213 rcu_read_unlock();
4214
4215 return 0;
4216}
4217
5b4a0ec0
DG
4218/*
4219 * Add channels/events from UST global domain to registered apps at sock.
4220 */
487cf67c
DG
4221void ust_app_global_update(struct ltt_ust_session *usess, int sock)
4222{
55c54cce 4223 int ret = 0;
31746f93 4224 struct lttng_ht_iter iter, uiter;
487cf67c 4225 struct ust_app *app;
3d8ca23b 4226 struct ust_app_session *ua_sess = NULL;
487cf67c
DG
4227 struct ust_app_channel *ua_chan;
4228 struct ust_app_event *ua_event;
727d5404 4229 struct ust_app_ctx *ua_ctx;
1f3580c7 4230
95e047ff 4231 assert(usess);
ffe60014 4232 assert(sock >= 0);
1f3580c7 4233
d9bf3ca4 4234 DBG2("UST app global update for app sock %d for session id %" PRIu64, sock,
a991f516 4235 usess->id);
487cf67c 4236
284d8f55
DG
4237 rcu_read_lock();
4238
f20baf8e 4239 app = ust_app_find_by_sock(sock);
487cf67c 4240 if (app == NULL) {
d88aee68
DG
4241 /*
4242 * Application can be unregistered before so this is possible hence
4243 * simply stopping the update.
4244 */
4245 DBG3("UST app update failed to find app sock %d", sock);
487cf67c
DG
4246 goto error;
4247 }
4248
e0c7ec2b
DG
4249 if (!app->compatible) {
4250 goto error;
4251 }
4252
3d8ca23b
DG
4253 ret = create_ust_app_session(usess, app, &ua_sess, NULL);
4254 if (ret < 0) {
4255 /* Tracer is probably gone or ENOMEM. */
487cf67c
DG
4256 goto error;
4257 }
3d8ca23b 4258 assert(ua_sess);
487cf67c 4259
d0b96690
DG
4260 pthread_mutex_lock(&ua_sess->lock);
4261
284d8f55 4262 /*
d0b96690 4263 * We can iterate safely here over all UST app session since the create ust
284d8f55
DG
4264 * app session above made a shadow copy of the UST global domain from the
4265 * ltt ust session.
4266 */
bec39940
DG
4267 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
4268 node.node) {
d65d2de8
DG
4269 /*
4270 * For a metadata channel, handle it differently.
4271 */
4272 if (!strncmp(ua_chan->name, DEFAULT_METADATA_NAME,
4273 sizeof(ua_chan->name))) {
4274 ret = create_ust_app_metadata(ua_sess, app, usess->consumer,
4275 &ua_chan->attr);
c7a339aa
DG
4276 if (ret < 0) {
4277 goto error_unlock;
4278 }
d65d2de8
DG
4279 /* Remove it from the hash table and continue!. */
4280 ret = lttng_ht_del(ua_sess->channels, &iter);
4281 assert(!ret);
4282 delete_ust_app_channel(-1, ua_chan, app);
4283 continue;
4284 } else {
4285 ret = do_create_channel(app, usess, ua_sess, ua_chan);
c7a339aa
DG
4286 if (ret < 0) {
4287 /*
4288 * Stop everything. On error, the application failed, no more
4289 * file descriptor are available or ENOMEM so stopping here is
4290 * the only thing we can do for now.
4291 */
4292 goto error_unlock;
4293 }
487cf67c
DG
4294 }
4295
31746f93
DG
4296 /*
4297 * Add context using the list so they are enabled in the same order the
4298 * user added them.
4299 */
4300 cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) {
727d5404
DG
4301 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
4302 if (ret < 0) {
d0b96690 4303 goto error_unlock;
727d5404
DG
4304 }
4305 }
4306
4307
284d8f55 4308 /* For each events */
bec39940
DG
4309 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
4310 node.node) {
284d8f55
DG
4311 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
4312 if (ret < 0) {
d0b96690 4313 goto error_unlock;
487cf67c 4314 }
36dc12cc 4315 }
487cf67c
DG
4316 }
4317
d0b96690
DG
4318 pthread_mutex_unlock(&ua_sess->lock);
4319
36dc12cc 4320 if (usess->start_trace) {
421cb601 4321 ret = ust_app_start_trace(usess, app);
36dc12cc 4322 if (ret < 0) {
36dc12cc
DG
4323 goto error;
4324 }
4325
852d0037 4326 DBG2("UST trace started for app pid %d", app->pid);
36dc12cc
DG
4327 }
4328
ffe60014
DG
4329 /* Everything went well at this point. */
4330 rcu_read_unlock();
4331 return;
4332
d0b96690
DG
4333error_unlock:
4334 pthread_mutex_unlock(&ua_sess->lock);
487cf67c 4335error:
ffe60014 4336 if (ua_sess) {
d0b96690 4337 destroy_app_session(app, ua_sess);
ffe60014 4338 }
487cf67c
DG
4339 rcu_read_unlock();
4340 return;
4341}
55cc08a6
DG
4342
4343/*
4344 * Add context to a specific channel for global UST domain.
4345 */
4346int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
4347 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
4348{
4349 int ret = 0;
bec39940
DG
4350 struct lttng_ht_node_str *ua_chan_node;
4351 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
4352 struct ust_app_channel *ua_chan = NULL;
4353 struct ust_app_session *ua_sess;
4354 struct ust_app *app;
4355
4356 rcu_read_lock();
4357
852d0037 4358 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
4359 if (!app->compatible) {
4360 /*
4361 * TODO: In time, we should notice the caller of this error by
4362 * telling him that this is a version error.
4363 */
4364 continue;
4365 }
55cc08a6
DG
4366 ua_sess = lookup_session_by_app(usess, app);
4367 if (ua_sess == NULL) {
4368 continue;
4369 }
4370
d0b96690 4371 pthread_mutex_lock(&ua_sess->lock);
55cc08a6 4372 /* Lookup channel in the ust app session */
bec39940
DG
4373 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
4374 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6 4375 if (ua_chan_node == NULL) {
d0b96690 4376 goto next_app;
55cc08a6
DG
4377 }
4378 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
4379 node);
55cc08a6
DG
4380 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
4381 if (ret < 0) {
d0b96690 4382 goto next_app;
55cc08a6 4383 }
d0b96690
DG
4384 next_app:
4385 pthread_mutex_unlock(&ua_sess->lock);
55cc08a6
DG
4386 }
4387
55cc08a6
DG
4388 rcu_read_unlock();
4389 return ret;
4390}
4391
76d45b40
DG
4392/*
4393 * Enable event for a channel from a UST session for a specific PID.
4394 */
4395int ust_app_enable_event_pid(struct ltt_ust_session *usess,
4396 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
4397{
4398 int ret = 0;
bec39940 4399 struct lttng_ht_iter iter;
18eace3b 4400 struct lttng_ht_node_str *ua_chan_node;
76d45b40
DG
4401 struct ust_app *app;
4402 struct ust_app_session *ua_sess;
4403 struct ust_app_channel *ua_chan;
4404 struct ust_app_event *ua_event;
4405
4406 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
4407
4408 rcu_read_lock();
4409
4410 app = ust_app_find_by_pid(pid);
4411 if (app == NULL) {
4412 ERR("UST app enable event per PID %d not found", pid);
4413 ret = -1;
d0b96690 4414 goto end;
76d45b40
DG
4415 }
4416
e0c7ec2b
DG
4417 if (!app->compatible) {
4418 ret = 0;
d0b96690 4419 goto end;
e0c7ec2b
DG
4420 }
4421
76d45b40 4422 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
4423 if (!ua_sess) {
4424 /* The application has problem or is probably dead. */
d0b96690
DG
4425 ret = 0;
4426 goto end;
c4a1715b 4427 }
76d45b40 4428
d0b96690 4429 pthread_mutex_lock(&ua_sess->lock);
76d45b40 4430 /* Lookup channel in the ust app session */
bec39940
DG
4431 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
4432 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
4433 /* If the channel is not found, there is a code flow error */
4434 assert(ua_chan_node);
4435
4436 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
4437
18eace3b 4438 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
39c5a3a7 4439 uevent->filter, uevent->attr.loglevel, uevent->exclusion);
18eace3b 4440 if (ua_event == NULL) {
76d45b40
DG
4441 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
4442 if (ret < 0) {
d0b96690 4443 goto end_unlock;
76d45b40
DG
4444 }
4445 } else {
76d45b40
DG
4446 ret = enable_ust_app_event(ua_sess, ua_event, app);
4447 if (ret < 0) {
d0b96690 4448 goto end_unlock;
76d45b40
DG
4449 }
4450 }
4451
d0b96690
DG
4452end_unlock:
4453 pthread_mutex_unlock(&ua_sess->lock);
4454end:
76d45b40
DG
4455 rcu_read_unlock();
4456 return ret;
4457}
7f79d3a1
DG
4458
4459/*
4460 * Disable event for a channel from a UST session for a specific PID.
4461 */
4462int ust_app_disable_event_pid(struct ltt_ust_session *usess,
4463 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
4464{
4465 int ret = 0;
bec39940
DG
4466 struct lttng_ht_iter iter;
4467 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
7f79d3a1
DG
4468 struct ust_app *app;
4469 struct ust_app_session *ua_sess;
4470 struct ust_app_channel *ua_chan;
4471 struct ust_app_event *ua_event;
4472
4473 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
4474
4475 rcu_read_lock();
4476
4477 app = ust_app_find_by_pid(pid);
4478 if (app == NULL) {
4479 ERR("UST app disable event per PID %d not found", pid);
4480 ret = -1;
4481 goto error;
4482 }
4483
e0c7ec2b
DG
4484 if (!app->compatible) {
4485 ret = 0;
4486 goto error;
4487 }
4488
7f79d3a1 4489 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
4490 if (!ua_sess) {
4491 /* The application has problem or is probably dead. */
4492 goto error;
4493 }
7f79d3a1
DG
4494
4495 /* Lookup channel in the ust app session */
bec39940
DG
4496 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
4497 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
4498 if (ua_chan_node == NULL) {
4499 /* Channel does not exist, skip disabling */
4500 goto error;
4501 }
4502 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
4503
bec39940
DG
4504 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
4505 ua_event_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
4506 if (ua_event_node == NULL) {
4507 /* Event does not exist, skip disabling */
4508 goto error;
4509 }
4510 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
4511
4512 ret = disable_ust_app_event(ua_sess, ua_event, app);
4513 if (ret < 0) {
4514 goto error;
4515 }
4516
4517error:
4518 rcu_read_unlock();
4519 return ret;
4520}
e0c7ec2b 4521
4466912f
DG
4522/*
4523 * Calibrate registered applications.
4524 */
4525int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
4526{
4527 int ret = 0;
4528 struct lttng_ht_iter iter;
4529 struct ust_app *app;
4530
4531 rcu_read_lock();
4532
852d0037 4533 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4466912f
DG
4534 if (!app->compatible) {
4535 /*
4536 * TODO: In time, we should notice the caller of this error by
4537 * telling him that this is a version error.
4538 */
4539 continue;
4540 }
4541
840cb59c 4542 health_code_update();
86acf0da 4543
852d0037 4544 ret = ustctl_calibrate(app->sock, calibrate);
4466912f
DG
4545 if (ret < 0) {
4546 switch (ret) {
4547 case -ENOSYS:
4548 /* Means that it's not implemented on the tracer side. */
4549 ret = 0;
4550 break;
4551 default:
4466912f 4552 DBG2("Calibrate app PID %d returned with error %d",
852d0037 4553 app->pid, ret);
4466912f
DG
4554 break;
4555 }
4556 }
4557 }
4558
4559 DBG("UST app global domain calibration finished");
4560
4561 rcu_read_unlock();
4562
840cb59c 4563 health_code_update();
86acf0da 4564
4466912f
DG
4565 return ret;
4566}
d0b96690
DG
4567
4568/*
4569 * Receive registration and populate the given msg structure.
4570 *
4571 * On success return 0 else a negative value returned by the ustctl call.
4572 */
4573int ust_app_recv_registration(int sock, struct ust_register_msg *msg)
4574{
4575 int ret;
4576 uint32_t pid, ppid, uid, gid;
4577
4578 assert(msg);
4579
4580 ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor,
4581 &pid, &ppid, &uid, &gid,
4582 &msg->bits_per_long,
4583 &msg->uint8_t_alignment,
4584 &msg->uint16_t_alignment,
4585 &msg->uint32_t_alignment,
4586 &msg->uint64_t_alignment,
4587 &msg->long_alignment,
4588 &msg->byte_order,
4589 msg->name);
4590 if (ret < 0) {
4591 switch (-ret) {
4592 case EPIPE:
4593 case ECONNRESET:
4594 case LTTNG_UST_ERR_EXITING:
4595 DBG3("UST app recv reg message failed. Application died");
4596 break;
4597 case LTTNG_UST_ERR_UNSUP_MAJOR:
4598 ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d",
4599 msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION,
4600 LTTNG_UST_ABI_MINOR_VERSION);
4601 break;
4602 default:
4603 ERR("UST app recv reg message failed with ret %d", ret);
4604 break;
4605 }
4606 goto error;
4607 }
4608 msg->pid = (pid_t) pid;
4609 msg->ppid = (pid_t) ppid;
4610 msg->uid = (uid_t) uid;
4611 msg->gid = (gid_t) gid;
4612
4613error:
4614 return ret;
4615}
4616
d88aee68
DG
4617/*
4618 * Return a ust app channel object using the application object and the channel
4619 * object descriptor has a key. If not found, NULL is returned. A RCU read side
4620 * lock MUST be acquired before calling this function.
4621 */
d0b96690
DG
4622static struct ust_app_channel *find_channel_by_objd(struct ust_app *app,
4623 int objd)
4624{
4625 struct lttng_ht_node_ulong *node;
4626 struct lttng_ht_iter iter;
4627 struct ust_app_channel *ua_chan = NULL;
4628
4629 assert(app);
4630
4631 lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter);
4632 node = lttng_ht_iter_get_node_ulong(&iter);
4633 if (node == NULL) {
4634 DBG2("UST app channel find by objd %d not found", objd);
4635 goto error;
4636 }
4637
4638 ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node);
4639
4640error:
4641 return ua_chan;
4642}
4643
d88aee68
DG
4644/*
4645 * Reply to a register channel notification from an application on the notify
4646 * socket. The channel metadata is also created.
4647 *
4648 * The session UST registry lock is acquired in this function.
4649 *
4650 * On success 0 is returned else a negative value.
4651 */
d0b96690
DG
4652static int reply_ust_register_channel(int sock, int sobjd, int cobjd,
4653 size_t nr_fields, struct ustctl_field *fields)
4654{
4655 int ret, ret_code = 0;
4656 uint32_t chan_id, reg_count;
7972aab2 4657 uint64_t chan_reg_key;
d0b96690
DG
4658 enum ustctl_channel_header type;
4659 struct ust_app *app;
4660 struct ust_app_channel *ua_chan;
4661 struct ust_app_session *ua_sess;
7972aab2 4662 struct ust_registry_session *registry;
45893984 4663 struct ust_registry_channel *chan_reg;
d0b96690
DG
4664
4665 rcu_read_lock();
4666
4667 /* Lookup application. If not found, there is a code flow error. */
4668 app = find_app_by_notify_sock(sock);
d88aee68
DG
4669 if (!app) {
4670 DBG("Application socket %d is being teardown. Abort event notify",
4671 sock);
4672 ret = 0;
d5d629b5 4673 free(fields);
d88aee68
DG
4674 goto error_rcu_unlock;
4675 }
d0b96690 4676
4950b860 4677 /* Lookup channel by UST object descriptor. */
d0b96690 4678 ua_chan = find_channel_by_objd(app, cobjd);
4950b860
MD
4679 if (!ua_chan) {
4680 DBG("Application channel is being teardown. Abort event notify");
4681 ret = 0;
d5d629b5 4682 free(fields);
4950b860
MD
4683 goto error_rcu_unlock;
4684 }
4685
d0b96690
DG
4686 assert(ua_chan->session);
4687 ua_sess = ua_chan->session;
d0b96690 4688
7972aab2
DG
4689 /* Get right session registry depending on the session buffer type. */
4690 registry = get_session_registry(ua_sess);
4691 assert(registry);
45893984 4692
7972aab2
DG
4693 /* Depending on the buffer type, a different channel key is used. */
4694 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) {
4695 chan_reg_key = ua_chan->tracing_channel_id;
d0b96690 4696 } else {
7972aab2 4697 chan_reg_key = ua_chan->key;
d0b96690
DG
4698 }
4699
7972aab2
DG
4700 pthread_mutex_lock(&registry->lock);
4701
4702 chan_reg = ust_registry_channel_find(registry, chan_reg_key);
4703 assert(chan_reg);
4704
4705 if (!chan_reg->register_done) {
4706 reg_count = ust_registry_get_event_count(chan_reg);
4707 if (reg_count < 31) {
4708 type = USTCTL_CHANNEL_HEADER_COMPACT;
4709 } else {
4710 type = USTCTL_CHANNEL_HEADER_LARGE;
4711 }
4712
4713 chan_reg->nr_ctx_fields = nr_fields;
4714 chan_reg->ctx_fields = fields;
4715 chan_reg->header_type = type;
d0b96690 4716 } else {
7972aab2
DG
4717 /* Get current already assigned values. */
4718 type = chan_reg->header_type;
d5d629b5
DG
4719 free(fields);
4720 /* Set to NULL so the error path does not do a double free. */
4721 fields = NULL;
d0b96690 4722 }
7972aab2
DG
4723 /* Channel id is set during the object creation. */
4724 chan_id = chan_reg->chan_id;
d0b96690
DG
4725
4726 /* Append to metadata */
7972aab2
DG
4727 if (!chan_reg->metadata_dumped) {
4728 ret_code = ust_metadata_channel_statedump(registry, chan_reg);
d0b96690
DG
4729 if (ret_code) {
4730 ERR("Error appending channel metadata (errno = %d)", ret_code);
4731 goto reply;
4732 }
4733 }
4734
4735reply:
7972aab2
DG
4736 DBG3("UST app replying to register channel key %" PRIu64
4737 " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type,
4738 ret_code);
d0b96690
DG
4739
4740 ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code);
4741 if (ret < 0) {
4742 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4743 ERR("UST app reply channel failed with ret %d", ret);
4744 } else {
4745 DBG3("UST app reply channel failed. Application died");
4746 }
4747 goto error;
4748 }
4749
7972aab2
DG
4750 /* This channel registry registration is completed. */
4751 chan_reg->register_done = 1;
4752
d0b96690 4753error:
7972aab2 4754 pthread_mutex_unlock(&registry->lock);
d88aee68 4755error_rcu_unlock:
d0b96690 4756 rcu_read_unlock();
d5d629b5
DG
4757 if (ret) {
4758 free(fields);
4759 }
d0b96690
DG
4760 return ret;
4761}
4762
d88aee68
DG
4763/*
4764 * Add event to the UST channel registry. When the event is added to the
4765 * registry, the metadata is also created. Once done, this replies to the
4766 * application with the appropriate error code.
4767 *
4768 * The session UST registry lock is acquired in the function.
4769 *
4770 * On success 0 is returned else a negative value.
4771 */
d0b96690
DG
4772static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name,
4773 char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel,
4774 char *model_emf_uri)
4775{
4776 int ret, ret_code;
4777 uint32_t event_id = 0;
7972aab2 4778 uint64_t chan_reg_key;
d0b96690
DG
4779 struct ust_app *app;
4780 struct ust_app_channel *ua_chan;
4781 struct ust_app_session *ua_sess;
7972aab2 4782 struct ust_registry_session *registry;
d0b96690
DG
4783
4784 rcu_read_lock();
4785
4786 /* Lookup application. If not found, there is a code flow error. */
4787 app = find_app_by_notify_sock(sock);
d88aee68
DG
4788 if (!app) {
4789 DBG("Application socket %d is being teardown. Abort event notify",
4790 sock);
4791 ret = 0;
d5d629b5
DG
4792 free(sig);
4793 free(fields);
4794 free(model_emf_uri);
d88aee68
DG
4795 goto error_rcu_unlock;
4796 }
d0b96690 4797
4950b860 4798 /* Lookup channel by UST object descriptor. */
d0b96690 4799 ua_chan = find_channel_by_objd(app, cobjd);
4950b860
MD
4800 if (!ua_chan) {
4801 DBG("Application channel is being teardown. Abort event notify");
4802 ret = 0;
d5d629b5
DG
4803 free(sig);
4804 free(fields);
4805 free(model_emf_uri);
4950b860
MD
4806 goto error_rcu_unlock;
4807 }
4808
d0b96690
DG
4809 assert(ua_chan->session);
4810 ua_sess = ua_chan->session;
4811
7972aab2
DG
4812 registry = get_session_registry(ua_sess);
4813 assert(registry);
4814
4815 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) {
4816 chan_reg_key = ua_chan->tracing_channel_id;
4817 } else {
4818 chan_reg_key = ua_chan->key;
4819 }
4820
4821 pthread_mutex_lock(&registry->lock);
d0b96690 4822
d5d629b5
DG
4823 /*
4824 * From this point on, this call acquires the ownership of the sig, fields
4825 * and model_emf_uri meaning any free are done inside it if needed. These
4826 * three variables MUST NOT be read/write after this.
4827 */
7972aab2 4828 ret_code = ust_registry_create_event(registry, chan_reg_key,
45893984 4829 sobjd, cobjd, name, sig, nr_fields, fields, loglevel,
8494bda5
MD
4830 model_emf_uri, ua_sess->buffer_type, &event_id,
4831 app);
d0b96690
DG
4832
4833 /*
4834 * The return value is returned to ustctl so in case of an error, the
4835 * application can be notified. In case of an error, it's important not to
4836 * return a negative error or else the application will get closed.
4837 */
4838 ret = ustctl_reply_register_event(sock, event_id, ret_code);
4839 if (ret < 0) {
4840 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4841 ERR("UST app reply event failed with ret %d", ret);
4842 } else {
4843 DBG3("UST app reply event failed. Application died");
4844 }
4845 /*
4846 * No need to wipe the create event since the application socket will
4847 * get close on error hence cleaning up everything by itself.
4848 */
4849 goto error;
4850 }
4851
7972aab2
DG
4852 DBG3("UST registry event %s with id %" PRId32 " added successfully",
4853 name, event_id);
d88aee68 4854
d0b96690 4855error:
7972aab2 4856 pthread_mutex_unlock(&registry->lock);
d88aee68 4857error_rcu_unlock:
d0b96690
DG
4858 rcu_read_unlock();
4859 return ret;
4860}
4861
d88aee68
DG
4862/*
4863 * Handle application notification through the given notify socket.
4864 *
4865 * Return 0 on success or else a negative value.
4866 */
d0b96690
DG
4867int ust_app_recv_notify(int sock)
4868{
4869 int ret;
4870 enum ustctl_notify_cmd cmd;
4871
4872 DBG3("UST app receiving notify from sock %d", sock);
4873
4874 ret = ustctl_recv_notify(sock, &cmd);
4875 if (ret < 0) {
4876 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4877 ERR("UST app recv notify failed with ret %d", ret);
4878 } else {
4879 DBG3("UST app recv notify failed. Application died");
4880 }
4881 goto error;
4882 }
4883
4884 switch (cmd) {
4885 case USTCTL_NOTIFY_CMD_EVENT:
4886 {
4887 int sobjd, cobjd, loglevel;
4888 char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri;
4889 size_t nr_fields;
4890 struct ustctl_field *fields;
4891
4892 DBG2("UST app ustctl register event received");
4893
4894 ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel,
4895 &sig, &nr_fields, &fields, &model_emf_uri);
4896 if (ret < 0) {
4897 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4898 ERR("UST app recv event failed with ret %d", ret);
4899 } else {
4900 DBG3("UST app recv event failed. Application died");
4901 }
4902 goto error;
4903 }
4904
d5d629b5
DG
4905 /*
4906 * Add event to the UST registry coming from the notify socket. This
4907 * call will free if needed the sig, fields and model_emf_uri. This
4908 * code path loses the ownsership of these variables and transfer them
4909 * to the this function.
4910 */
d0b96690
DG
4911 ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields,
4912 fields, loglevel, model_emf_uri);
4913 if (ret < 0) {
4914 goto error;
4915 }
4916
4917 break;
4918 }
4919 case USTCTL_NOTIFY_CMD_CHANNEL:
4920 {
4921 int sobjd, cobjd;
4922 size_t nr_fields;
4923 struct ustctl_field *fields;
4924
4925 DBG2("UST app ustctl register channel received");
4926
4927 ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields,
4928 &fields);
4929 if (ret < 0) {
4930 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4931 ERR("UST app recv channel failed with ret %d", ret);
4932 } else {
4933 DBG3("UST app recv channel failed. Application died");
4934 }
4935 goto error;
4936 }
4937
d5d629b5
DG
4938 /*
4939 * The fields ownership are transfered to this function call meaning
4940 * that if needed it will be freed. After this, it's invalid to access
4941 * fields or clean it up.
4942 */
d0b96690
DG
4943 ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields,
4944 fields);
4945 if (ret < 0) {
4946 goto error;
4947 }
4948
4949 break;
4950 }
4951 default:
4952 /* Should NEVER happen. */
4953 assert(0);
4954 }
4955
4956error:
4957 return ret;
4958}
d88aee68
DG
4959
4960/*
4961 * Once the notify socket hangs up, this is called. First, it tries to find the
4962 * corresponding application. On failure, the call_rcu to close the socket is
4963 * executed. If an application is found, it tries to delete it from the notify
4964 * socket hash table. Whathever the result, it proceeds to the call_rcu.
4965 *
4966 * Note that an object needs to be allocated here so on ENOMEM failure, the
4967 * call RCU is not done but the rest of the cleanup is.
4968 */
4969void ust_app_notify_sock_unregister(int sock)
4970{
4971 int err_enomem = 0;
4972 struct lttng_ht_iter iter;
4973 struct ust_app *app;
4974 struct ust_app_notify_sock_obj *obj;
4975
4976 assert(sock >= 0);
4977
4978 rcu_read_lock();
4979
4980 obj = zmalloc(sizeof(*obj));
4981 if (!obj) {
4982 /*
4983 * An ENOMEM is kind of uncool. If this strikes we continue the
4984 * procedure but the call_rcu will not be called. In this case, we
4985 * accept the fd leak rather than possibly creating an unsynchronized
4986 * state between threads.
4987 *
4988 * TODO: The notify object should be created once the notify socket is
4989 * registered and stored independantely from the ust app object. The
4990 * tricky part is to synchronize the teardown of the application and
4991 * this notify object. Let's keep that in mind so we can avoid this
4992 * kind of shenanigans with ENOMEM in the teardown path.
4993 */
4994 err_enomem = 1;
4995 } else {
4996 obj->fd = sock;
4997 }
4998
4999 DBG("UST app notify socket unregister %d", sock);
5000
5001 /*
5002 * Lookup application by notify socket. If this fails, this means that the
5003 * hash table delete has already been done by the application
5004 * unregistration process so we can safely close the notify socket in a
5005 * call RCU.
5006 */
5007 app = find_app_by_notify_sock(sock);
5008 if (!app) {
5009 goto close_socket;
5010 }
5011
5012 iter.iter.node = &app->notify_sock_n.node;
5013
5014 /*
5015 * Whatever happens here either we fail or succeed, in both cases we have
5016 * to close the socket after a grace period to continue to the call RCU
5017 * here. If the deletion is successful, the application is not visible
5018 * anymore by other threads and is it fails it means that it was already
5019 * deleted from the hash table so either way we just have to close the
5020 * socket.
5021 */
5022 (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
5023
5024close_socket:
5025 rcu_read_unlock();
5026
5027 /*
5028 * Close socket after a grace period to avoid for the socket to be reused
5029 * before the application object is freed creating potential race between
5030 * threads trying to add unique in the global hash table.
5031 */
5032 if (!err_enomem) {
5033 call_rcu(&obj->head, close_notify_sock_rcu);
5034 }
5035}
f45e313d
DG
5036
5037/*
5038 * Destroy a ust app data structure and free its memory.
5039 */
5040void ust_app_destroy(struct ust_app *app)
5041{
5042 if (!app) {
5043 return;
5044 }
5045
5046 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
5047}
6dc3064a
DG
5048
5049/*
5050 * Take a snapshot for a given UST session. The snapshot is sent to the given
5051 * output.
5052 *
5053 * Return 0 on success or else a negative value.
5054 */
5055int ust_app_snapshot_record(struct ltt_ust_session *usess,
5c786ded 5056 struct snapshot_output *output, int wait, unsigned int nb_streams)
6dc3064a
DG
5057{
5058 int ret = 0;
5059 struct lttng_ht_iter iter;
5060 struct ust_app *app;
af706bb7 5061 char pathname[PATH_MAX];
5c786ded 5062 uint64_t max_stream_size = 0;
6dc3064a
DG
5063
5064 assert(usess);
5065 assert(output);
5066
5067 rcu_read_lock();
5068
5c786ded
JD
5069 /*
5070 * Compute the maximum size of a single stream if a max size is asked by
5071 * the caller.
5072 */
5073 if (output->max_size > 0 && nb_streams > 0) {
5074 max_stream_size = output->max_size / nb_streams;
5075 }
5076
8c924c7b
MD
5077 switch (usess->buffer_type) {
5078 case LTTNG_BUFFER_PER_UID:
5079 {
5080 struct buffer_reg_uid *reg;
6dc3064a 5081
8c924c7b
MD
5082 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
5083 struct buffer_reg_channel *reg_chan;
5084 struct consumer_socket *socket;
6dc3064a 5085
8c924c7b
MD
5086 /* Get consumer socket to use to push the metadata.*/
5087 socket = consumer_find_socket_by_bitness(reg->bits_per_long,
5088 usess->consumer);
5089 if (!socket) {
5090 ret = -EINVAL;
5091 goto error;
5092 }
6dc3064a 5093
8c924c7b
MD
5094 memset(pathname, 0, sizeof(pathname));
5095 ret = snprintf(pathname, sizeof(pathname),
5096 DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH,
5097 reg->uid, reg->bits_per_long);
5098 if (ret < 0) {
5099 PERROR("snprintf snapshot path");
5100 goto error;
5101 }
5102
5103 /* Add the UST default trace dir to path. */
5104 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
5105 reg_chan, node.node) {
5106
5107 /*
5108 * Make sure the maximum stream size is not lower than the
5109 * subbuffer size or else it's an error since we won't be able to
5110 * snapshot anything.
5111 */
5112 if (max_stream_size &&
5113 reg_chan->subbuf_size > max_stream_size) {
5114 ret = -EINVAL;
5115 DBG3("UST app snapshot record maximum stream size %" PRIu64
6a00837f 5116 " is smaller than subbuffer size of %zu",
8c924c7b
MD
5117 max_stream_size, reg_chan->subbuf_size);
5118 goto error;
5119 }
5120 ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, output, 0,
5121 usess->uid, usess->gid, pathname, wait,
5122 max_stream_size);
5123 if (ret < 0) {
5124 goto error;
5125 }
5126 }
5127 ret = consumer_snapshot_channel(socket, reg->registry->reg.ust->metadata_key, output,
5128 1, usess->uid, usess->gid, pathname, wait,
5129 max_stream_size);
5130 if (ret < 0) {
5131 goto error;
5132 }
af706bb7 5133 }
8c924c7b
MD
5134 break;
5135 }
5136 case LTTNG_BUFFER_PER_PID:
5137 {
5138 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
5139 struct consumer_socket *socket;
5140 struct lttng_ht_iter chan_iter;
5141 struct ust_app_channel *ua_chan;
5142 struct ust_app_session *ua_sess;
5143 struct ust_registry_session *registry;
5144
5145 ua_sess = lookup_session_by_app(usess, app);
5146 if (!ua_sess) {
5147 /* Session not associated with this app. */
5148 continue;
5149 }
af706bb7 5150
8c924c7b
MD
5151 /* Get the right consumer socket for the application. */
5152 socket = consumer_find_socket_by_bitness(app->bits_per_long,
5153 output->consumer);
5154 if (!socket) {
5c786ded 5155 ret = -EINVAL;
5c786ded
JD
5156 goto error;
5157 }
5158
8c924c7b
MD
5159 /* Add the UST default trace dir to path. */
5160 memset(pathname, 0, sizeof(pathname));
5161 ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s",
5162 ua_sess->path);
6dc3064a 5163 if (ret < 0) {
8c924c7b 5164 PERROR("snprintf snapshot path");
6dc3064a
DG
5165 goto error;
5166 }
6dc3064a 5167
8c924c7b
MD
5168 cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
5169 ua_chan, node.node) {
5170 /*
5171 * Make sure the maximum stream size is not lower than the
5172 * subbuffer size or else it's an error since we won't be able to
5173 * snapshot anything.
5174 */
5175 if (max_stream_size &&
5176 ua_chan->attr.subbuf_size > max_stream_size) {
5177 ret = -EINVAL;
5178 DBG3("UST app snapshot record maximum stream size %" PRIu64
5179 " is smaller than subbuffer size of %" PRIu64,
5180 max_stream_size, ua_chan->attr.subbuf_size);
5181 goto error;
5182 }
6dc3064a 5183
8c924c7b
MD
5184 ret = consumer_snapshot_channel(socket, ua_chan->key, output, 0,
5185 ua_sess->euid, ua_sess->egid, pathname, wait,
5186 max_stream_size);
5187 if (ret < 0) {
5188 goto error;
5189 }
5190 }
5191
5192 registry = get_session_registry(ua_sess);
5193 assert(registry);
5194 ret = consumer_snapshot_channel(socket, registry->metadata_key, output,
5195 1, ua_sess->euid, ua_sess->egid, pathname, wait,
5196 max_stream_size);
5197 if (ret < 0) {
5198 goto error;
5199 }
5200 }
5201 break;
5202 }
5203 default:
5204 assert(0);
5205 break;
6dc3064a
DG
5206 }
5207
5208error:
5209 rcu_read_unlock();
5210 return ret;
5211}
5c786ded
JD
5212
5213/*
5214 * Return the number of streams for a UST session.
5215 */
5216unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess)
5217{
5218 unsigned int ret = 0;
5219 struct ust_app *app;
5220 struct lttng_ht_iter iter;
5221
5222 assert(usess);
5223
5224 switch (usess->buffer_type) {
5225 case LTTNG_BUFFER_PER_UID:
5226 {
5227 struct buffer_reg_uid *reg;
5228
5229 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
5230 struct buffer_reg_channel *reg_chan;
5231
5232 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
5233 reg_chan, node.node) {
5234 ret += reg_chan->stream_count;
5235 }
5236 }
5237 break;
5238 }
5239 case LTTNG_BUFFER_PER_PID:
5240 {
5241 rcu_read_lock();
5242 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
5243 struct ust_app_channel *ua_chan;
5244 struct ust_app_session *ua_sess;
5245 struct lttng_ht_iter chan_iter;
5246
5247 ua_sess = lookup_session_by_app(usess, app);
5248 if (!ua_sess) {
5249 /* Session not associated with this app. */
5250 continue;
5251 }
5252
5253 cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
5254 ua_chan, node.node) {
5255 ret += ua_chan->streams.count;
5256 }
5257 }
5258 rcu_read_unlock();
5259 break;
5260 }
5261 default:
5262 assert(0);
5263 break;
5264 }
5265
5266 return ret;
5267}
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