Fix: channel names are not validated
[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.
91d76f53
DG
16 */
17
18#define _GNU_SOURCE
6c1c0768 19#define _LGPL_SOURCE
91d76f53 20#include <errno.h>
7972aab2 21#include <inttypes.h>
91d76f53
DG
22#include <pthread.h>
23#include <stdio.h>
24#include <stdlib.h>
099e26bd 25#include <string.h>
aba8e916
DG
26#include <sys/stat.h>
27#include <sys/types.h>
099e26bd 28#include <unistd.h>
0df502fd 29#include <urcu/compiler.h>
fb54cdbf 30#include <lttng/ust-error.h>
331744e3 31#include <signal.h>
bec39940 32
990570ed 33#include <common/common.h>
86acf0da 34#include <common/sessiond-comm/sessiond-comm.h>
1e307fab 35
7972aab2 36#include "buffer-registry.h"
86acf0da 37#include "fd-limit.h"
8782cc74 38#include "health-sessiond.h"
56fff090 39#include "ust-app.h"
48842b30 40#include "ust-consumer.h"
d80a6244 41#include "ust-ctl.h"
0b2dc8df 42#include "utils.h"
d80a6244 43
d9bf3ca4
MD
44/* Next available channel key. Access under next_channel_key_lock. */
45static uint64_t _next_channel_key;
46static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER;
47
48/* Next available session ID. Access under next_session_id_lock. */
49static uint64_t _next_session_id;
50static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER;
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DG
51
52/*
d9bf3ca4 53 * Return the incremented value of next_channel_key.
ffe60014 54 */
d9bf3ca4 55static uint64_t get_next_channel_key(void)
ffe60014 56{
d9bf3ca4
MD
57 uint64_t ret;
58
59 pthread_mutex_lock(&next_channel_key_lock);
60 ret = ++_next_channel_key;
61 pthread_mutex_unlock(&next_channel_key_lock);
62 return ret;
ffe60014
DG
63}
64
65/*
7972aab2 66 * Return the atomically incremented value of next_session_id.
ffe60014 67 */
d9bf3ca4 68static uint64_t get_next_session_id(void)
ffe60014 69{
d9bf3ca4
MD
70 uint64_t ret;
71
72 pthread_mutex_lock(&next_session_id_lock);
73 ret = ++_next_session_id;
74 pthread_mutex_unlock(&next_session_id_lock);
75 return ret;
ffe60014
DG
76}
77
d65d2de8
DG
78static void copy_channel_attr_to_ustctl(
79 struct ustctl_consumer_channel_attr *attr,
80 struct lttng_ust_channel_attr *uattr)
81{
82 /* Copy event attributes since the layout is different. */
83 attr->subbuf_size = uattr->subbuf_size;
84 attr->num_subbuf = uattr->num_subbuf;
85 attr->overwrite = uattr->overwrite;
86 attr->switch_timer_interval = uattr->switch_timer_interval;
87 attr->read_timer_interval = uattr->read_timer_interval;
88 attr->output = uattr->output;
89}
90
025faf73
DG
91/*
92 * Match function for the hash table lookup.
93 *
94 * It matches an ust app event based on three attributes which are the event
95 * name, the filter bytecode and the loglevel.
96 */
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97static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key)
98{
99 struct ust_app_event *event;
100 const struct ust_app_ht_key *key;
101
102 assert(node);
103 assert(_key);
104
105 event = caa_container_of(node, struct ust_app_event, node.node);
106 key = _key;
107
1af53eb5 108 /* Match the 4 elements of the key: name, filter, loglevel, exclusions */
18eace3b
DG
109
110 /* Event name */
111 if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
112 goto no_match;
113 }
114
115 /* Event loglevel. */
116 if (event->attr.loglevel != key->loglevel) {
025faf73
DG
117 if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL
118 && key->loglevel == 0 && event->attr.loglevel == -1) {
119 /*
120 * Match is accepted. This is because on event creation, the
121 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
122 * -1 are accepted for this loglevel type since 0 is the one set by
123 * the API when receiving an enable event.
124 */
125 } else {
126 goto no_match;
127 }
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DG
128 }
129
130 /* One of the filters is NULL, fail. */
131 if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
132 goto no_match;
133 }
134
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DG
135 if (key->filter && event->filter) {
136 /* Both filters exists, check length followed by the bytecode. */
137 if (event->filter->len != key->filter->len ||
138 memcmp(event->filter->data, key->filter->data,
139 event->filter->len) != 0) {
140 goto no_match;
141 }
18eace3b
DG
142 }
143
1af53eb5
JI
144 /* One of the exclusions is NULL, fail. */
145 if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) {
146 goto no_match;
147 }
148
149 if (key->exclusion && event->exclusion) {
150 /* Both exclusions exists, check count followed by the names. */
151 if (event->exclusion->count != key->exclusion->count ||
152 memcmp(event->exclusion->names, key->exclusion->names,
153 event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) {
154 goto no_match;
155 }
156 }
157
158
025faf73 159 /* Match. */
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160 return 1;
161
162no_match:
163 return 0;
18eace3b
DG
164}
165
025faf73
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166/*
167 * Unique add of an ust app event in the given ht. This uses the custom
168 * ht_match_ust_app_event match function and the event name as hash.
169 */
d0b96690 170static void add_unique_ust_app_event(struct ust_app_channel *ua_chan,
18eace3b
DG
171 struct ust_app_event *event)
172{
173 struct cds_lfht_node *node_ptr;
174 struct ust_app_ht_key key;
d0b96690 175 struct lttng_ht *ht;
18eace3b 176
d0b96690
DG
177 assert(ua_chan);
178 assert(ua_chan->events);
18eace3b
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179 assert(event);
180
d0b96690 181 ht = ua_chan->events;
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182 key.name = event->attr.name;
183 key.filter = event->filter;
184 key.loglevel = event->attr.loglevel;
91c89f23 185 key.exclusion = event->exclusion;
18eace3b
DG
186
187 node_ptr = cds_lfht_add_unique(ht->ht,
188 ht->hash_fct(event->node.key, lttng_ht_seed),
189 ht_match_ust_app_event, &key, &event->node.node);
190 assert(node_ptr == &event->node.node);
191}
192
d88aee68
DG
193/*
194 * Close the notify socket from the given RCU head object. This MUST be called
195 * through a call_rcu().
196 */
197static void close_notify_sock_rcu(struct rcu_head *head)
198{
199 int ret;
200 struct ust_app_notify_sock_obj *obj =
201 caa_container_of(head, struct ust_app_notify_sock_obj, head);
202
203 /* Must have a valid fd here. */
204 assert(obj->fd >= 0);
205
206 ret = close(obj->fd);
207 if (ret) {
208 ERR("close notify sock %d RCU", obj->fd);
209 }
210 lttng_fd_put(LTTNG_FD_APPS, 1);
211
212 free(obj);
213}
214
7972aab2
DG
215/*
216 * Return the session registry according to the buffer type of the given
217 * session.
218 *
219 * A registry per UID object MUST exists before calling this function or else
220 * it assert() if not found. RCU read side lock must be acquired.
221 */
222static struct ust_registry_session *get_session_registry(
223 struct ust_app_session *ua_sess)
224{
225 struct ust_registry_session *registry = NULL;
226
227 assert(ua_sess);
228
229 switch (ua_sess->buffer_type) {
230 case LTTNG_BUFFER_PER_PID:
231 {
232 struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id);
233 if (!reg_pid) {
234 goto error;
235 }
236 registry = reg_pid->registry->reg.ust;
237 break;
238 }
239 case LTTNG_BUFFER_PER_UID:
240 {
241 struct buffer_reg_uid *reg_uid = buffer_reg_uid_find(
242 ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid);
243 if (!reg_uid) {
244 goto error;
245 }
246 registry = reg_uid->registry->reg.ust;
247 break;
248 }
249 default:
250 assert(0);
251 };
252
253error:
254 return registry;
255}
256
55cc08a6
DG
257/*
258 * Delete ust context safely. RCU read lock must be held before calling
259 * this function.
260 */
261static
262void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
263{
ffe60014
DG
264 int ret;
265
266 assert(ua_ctx);
267
55cc08a6 268 if (ua_ctx->obj) {
ffe60014 269 ret = ustctl_release_object(sock, ua_ctx->obj);
d0b96690
DG
270 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
271 ERR("UST app sock %d release ctx obj handle %d failed with ret %d",
272 sock, ua_ctx->obj->handle, ret);
ffe60014 273 }
55cc08a6
DG
274 free(ua_ctx->obj);
275 }
276 free(ua_ctx);
277}
278
d80a6244
DG
279/*
280 * Delete ust app event safely. RCU read lock must be held before calling
281 * this function.
282 */
8b366481
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283static
284void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
d80a6244 285{
ffe60014
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286 int ret;
287
288 assert(ua_event);
289
53a80697 290 free(ua_event->filter);
951f0b71
JI
291 if (ua_event->exclusion != NULL)
292 free(ua_event->exclusion);
edb67388 293 if (ua_event->obj != NULL) {
ffe60014
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294 ret = ustctl_release_object(sock, ua_event->obj);
295 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
296 ERR("UST app sock %d release event obj failed with ret %d",
297 sock, ret);
298 }
edb67388
DG
299 free(ua_event->obj);
300 }
d80a6244
DG
301 free(ua_event);
302}
303
304/*
7972aab2
DG
305 * Release ust data object of the given stream.
306 *
307 * Return 0 on success or else a negative value.
d80a6244 308 */
7972aab2 309static int release_ust_app_stream(int sock, struct ust_app_stream *stream)
d80a6244 310{
7972aab2 311 int ret = 0;
ffe60014
DG
312
313 assert(stream);
314
8b366481 315 if (stream->obj) {
ffe60014
DG
316 ret = ustctl_release_object(sock, stream->obj);
317 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
318 ERR("UST app sock %d release stream obj failed with ret %d",
319 sock, ret);
320 }
4063050c 321 lttng_fd_put(LTTNG_FD_APPS, 2);
8b366481
DG
322 free(stream->obj);
323 }
7972aab2
DG
324
325 return ret;
326}
327
328/*
329 * Delete ust app stream safely. RCU read lock must be held before calling
330 * this function.
331 */
332static
333void delete_ust_app_stream(int sock, struct ust_app_stream *stream)
334{
335 assert(stream);
336
337 (void) release_ust_app_stream(sock, stream);
84cd17c6 338 free(stream);
d80a6244
DG
339}
340
36b588ed
MD
341/*
342 * We need to execute ht_destroy outside of RCU read-side critical
0b2dc8df
MD
343 * section and outside of call_rcu thread, so we postpone its execution
344 * using ht_cleanup_push. It is simpler than to change the semantic of
345 * the many callers of delete_ust_app_session().
36b588ed
MD
346 */
347static
348void delete_ust_app_channel_rcu(struct rcu_head *head)
349{
350 struct ust_app_channel *ua_chan =
351 caa_container_of(head, struct ust_app_channel, rcu_head);
352
0b2dc8df
MD
353 ht_cleanup_push(ua_chan->ctx);
354 ht_cleanup_push(ua_chan->events);
36b588ed
MD
355 free(ua_chan);
356}
357
d80a6244
DG
358/*
359 * Delete ust app channel safely. RCU read lock must be held before calling
360 * this function.
361 */
8b366481 362static
d0b96690
DG
363void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan,
364 struct ust_app *app)
d80a6244
DG
365{
366 int ret;
bec39940 367 struct lttng_ht_iter iter;
d80a6244 368 struct ust_app_event *ua_event;
55cc08a6 369 struct ust_app_ctx *ua_ctx;
030a66fa 370 struct ust_app_stream *stream, *stmp;
7972aab2 371 struct ust_registry_session *registry;
d80a6244 372
ffe60014
DG
373 assert(ua_chan);
374
375 DBG3("UST app deleting channel %s", ua_chan->name);
376
55cc08a6 377 /* Wipe stream */
d80a6244 378 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
84cd17c6 379 cds_list_del(&stream->list);
d80a6244
DG
380 delete_ust_app_stream(sock, stream);
381 }
382
55cc08a6 383 /* Wipe context */
bec39940 384 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
31746f93 385 cds_list_del(&ua_ctx->list);
bec39940 386 ret = lttng_ht_del(ua_chan->ctx, &iter);
55cc08a6
DG
387 assert(!ret);
388 delete_ust_app_ctx(sock, ua_ctx);
389 }
d80a6244 390
55cc08a6 391 /* Wipe events */
bec39940
DG
392 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
393 node.node) {
394 ret = lttng_ht_del(ua_chan->events, &iter);
525b0740 395 assert(!ret);
d80a6244
DG
396 delete_ust_app_event(sock, ua_event);
397 }
edb67388 398
c8335706
MD
399 if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) {
400 /* Wipe and free registry from session registry. */
401 registry = get_session_registry(ua_chan->session);
402 if (registry) {
403 ust_registry_channel_del_free(registry, ua_chan->key);
404 }
7972aab2 405 }
d0b96690 406
edb67388 407 if (ua_chan->obj != NULL) {
d0b96690
DG
408 /* Remove channel from application UST object descriptor. */
409 iter.iter.node = &ua_chan->ust_objd_node.node;
c6e62271
DG
410 ret = lttng_ht_del(app->ust_objd, &iter);
411 assert(!ret);
ffe60014
DG
412 ret = ustctl_release_object(sock, ua_chan->obj);
413 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
414 ERR("UST app sock %d release channel obj failed with ret %d",
415 sock, ret);
416 }
7972aab2 417 lttng_fd_put(LTTNG_FD_APPS, 1);
edb67388
DG
418 free(ua_chan->obj);
419 }
36b588ed 420 call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu);
d80a6244
DG
421}
422
331744e3 423/*
1b532a60
DG
424 * Push metadata to consumer socket.
425 *
426 * The socket lock MUST be acquired.
427 * The ust app session lock MUST be acquired.
331744e3
JD
428 *
429 * On success, return the len of metadata pushed or else a negative value.
430 */
431ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
432 struct consumer_socket *socket, int send_zero_data)
433{
434 int ret;
435 char *metadata_str = NULL;
436 size_t len, offset;
437 ssize_t ret_val;
438
439 assert(registry);
440 assert(socket);
1b532a60
DG
441
442 /*
443 * On a push metadata error either the consumer is dead or the metadata
444 * channel has been destroyed because its endpoint might have died (e.g:
445 * relayd). If so, the metadata closed flag is set to 1 so we deny pushing
446 * metadata again which is not valid anymore on the consumer side.
447 *
448 * The ust app session mutex locked allows us to make this check without
449 * the registry lock.
450 */
451 if (registry->metadata_closed) {
452 return -EPIPE;
453 }
331744e3
JD
454
455 pthread_mutex_lock(&registry->lock);
456
457 offset = registry->metadata_len_sent;
458 len = registry->metadata_len - registry->metadata_len_sent;
459 if (len == 0) {
460 DBG3("No metadata to push for metadata key %" PRIu64,
461 registry->metadata_key);
462 ret_val = len;
463 if (send_zero_data) {
464 DBG("No metadata to push");
465 goto push_data;
466 }
467 goto end;
468 }
469
470 /* Allocate only what we have to send. */
471 metadata_str = zmalloc(len);
472 if (!metadata_str) {
473 PERROR("zmalloc ust app metadata string");
474 ret_val = -ENOMEM;
475 goto error;
476 }
477 /* Copy what we haven't send out. */
478 memcpy(metadata_str, registry->metadata + offset, len);
479 registry->metadata_len_sent += len;
480
481push_data:
482 pthread_mutex_unlock(&registry->lock);
483 ret = consumer_push_metadata(socket, registry->metadata_key,
484 metadata_str, len, offset);
485 if (ret < 0) {
000baf6a
DG
486 /*
487 * There is an acceptable race here between the registry metadata key
488 * assignment and the creation on the consumer. The session daemon can
489 * concurrently push metadata for this registry while being created on
490 * the consumer since the metadata key of the registry is assigned
491 * *before* it is setup to avoid the consumer to ask for metadata that
492 * could possibly be not found in the session daemon.
493 *
494 * The metadata will get pushed either by the session being stopped or
495 * the consumer requesting metadata if that race is triggered.
496 */
497 if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) {
498 ret = 0;
499 }
ffa3f245
DG
500
501 /* Update back the actual metadata len sent since it failed here. */
502 pthread_mutex_lock(&registry->lock);
503 registry->metadata_len_sent -= len;
504 pthread_mutex_unlock(&registry->lock);
331744e3
JD
505 ret_val = ret;
506 goto error_push;
507 }
508
509 free(metadata_str);
510 return len;
511
512end:
513error:
514 pthread_mutex_unlock(&registry->lock);
515error_push:
516 free(metadata_str);
517 return ret_val;
518}
519
d88aee68
DG
520/*
521 * For a given application and session, push metadata to consumer. The session
522 * lock MUST be acquired here before calling this.
331744e3
JD
523 * Either sock or consumer is required : if sock is NULL, the default
524 * socket to send the metadata is retrieved from consumer, if sock
525 * is not NULL we use it to send the metadata.
d88aee68
DG
526 *
527 * Return 0 on success else a negative error.
528 */
7972aab2
DG
529static int push_metadata(struct ust_registry_session *registry,
530 struct consumer_output *consumer)
d88aee68 531{
331744e3
JD
532 int ret_val;
533 ssize_t ret;
d88aee68
DG
534 struct consumer_socket *socket;
535
7972aab2
DG
536 assert(registry);
537 assert(consumer);
538
539 rcu_read_lock();
d88aee68 540
7972aab2
DG
541 /*
542 * Means that no metadata was assigned to the session. This can happens if
543 * no start has been done previously.
544 */
545 if (!registry->metadata_key) {
331744e3 546 ret_val = 0;
1b532a60 547 goto end_rcu_unlock;
d88aee68
DG
548 }
549
d88aee68 550 /* Get consumer socket to use to push the metadata.*/
7972aab2
DG
551 socket = consumer_find_socket_by_bitness(registry->bits_per_long,
552 consumer);
d88aee68 553 if (!socket) {
331744e3 554 ret_val = -1;
d88aee68
DG
555 goto error_rcu_unlock;
556 }
557
558 /*
559 * TODO: Currently, we hold the socket lock around sampling of the next
560 * metadata segment to ensure we send metadata over the consumer socket in
561 * the correct order. This makes the registry lock nest inside the socket
562 * lock.
563 *
564 * Please note that this is a temporary measure: we should move this lock
565 * back into ust_consumer_push_metadata() when the consumer gets the
566 * ability to reorder the metadata it receives.
567 */
568 pthread_mutex_lock(socket->lock);
331744e3
JD
569 ret = ust_app_push_metadata(registry, socket, 0);
570 pthread_mutex_unlock(socket->lock);
d88aee68 571 if (ret < 0) {
331744e3 572 ret_val = ret;
d88aee68
DG
573 goto error_rcu_unlock;
574 }
575
d88aee68 576 rcu_read_unlock();
d88aee68
DG
577 return 0;
578
d88aee68 579error_rcu_unlock:
1b532a60
DG
580 /*
581 * On error, flag the registry that the metadata is closed. We were unable
582 * to push anything and this means that either the consumer is not
583 * responding or the metadata cache has been destroyed on the consumer.
584 */
585 registry->metadata_closed = 1;
586end_rcu_unlock:
d88aee68 587 rcu_read_unlock();
331744e3 588 return ret_val;
d88aee68
DG
589}
590
591/*
592 * Send to the consumer a close metadata command for the given session. Once
593 * done, the metadata channel is deleted and the session metadata pointer is
594 * nullified. The session lock MUST be acquired here unless the application is
595 * in the destroy path.
596 *
597 * Return 0 on success else a negative value.
598 */
7972aab2
DG
599static int close_metadata(struct ust_registry_session *registry,
600 struct consumer_output *consumer)
d88aee68
DG
601{
602 int ret;
603 struct consumer_socket *socket;
604
7972aab2
DG
605 assert(registry);
606 assert(consumer);
d88aee68 607
7972aab2
DG
608 rcu_read_lock();
609
610 if (!registry->metadata_key || registry->metadata_closed) {
d88aee68 611 ret = 0;
1b532a60 612 goto end;
d88aee68
DG
613 }
614
d88aee68 615 /* Get consumer socket to use to push the metadata.*/
7972aab2
DG
616 socket = consumer_find_socket_by_bitness(registry->bits_per_long,
617 consumer);
d88aee68
DG
618 if (!socket) {
619 ret = -1;
7972aab2 620 goto error;
d88aee68
DG
621 }
622
7972aab2 623 ret = consumer_close_metadata(socket, registry->metadata_key);
d88aee68 624 if (ret < 0) {
7972aab2 625 goto error;
d88aee68
DG
626 }
627
d88aee68 628error:
1b532a60
DG
629 /*
630 * Metadata closed. Even on error this means that the consumer is not
631 * responding or not found so either way a second close should NOT be emit
632 * for this registry.
633 */
634 registry->metadata_closed = 1;
635end:
7972aab2 636 rcu_read_unlock();
d88aee68
DG
637 return ret;
638}
639
36b588ed
MD
640/*
641 * We need to execute ht_destroy outside of RCU read-side critical
0b2dc8df
MD
642 * section and outside of call_rcu thread, so we postpone its execution
643 * using ht_cleanup_push. It is simpler than to change the semantic of
644 * the many callers of delete_ust_app_session().
36b588ed
MD
645 */
646static
647void delete_ust_app_session_rcu(struct rcu_head *head)
648{
649 struct ust_app_session *ua_sess =
650 caa_container_of(head, struct ust_app_session, rcu_head);
651
0b2dc8df 652 ht_cleanup_push(ua_sess->channels);
36b588ed
MD
653 free(ua_sess);
654}
655
d80a6244
DG
656/*
657 * Delete ust app session safely. RCU read lock must be held before calling
658 * this function.
659 */
8b366481 660static
d0b96690
DG
661void delete_ust_app_session(int sock, struct ust_app_session *ua_sess,
662 struct ust_app *app)
d80a6244
DG
663{
664 int ret;
bec39940 665 struct lttng_ht_iter iter;
d80a6244 666 struct ust_app_channel *ua_chan;
7972aab2 667 struct ust_registry_session *registry;
d80a6244 668
d88aee68
DG
669 assert(ua_sess);
670
1b532a60
DG
671 pthread_mutex_lock(&ua_sess->lock);
672
7972aab2 673 registry = get_session_registry(ua_sess);
1b532a60 674 if (registry && !registry->metadata_closed) {
d88aee68 675 /* Push metadata for application before freeing the application. */
7972aab2 676 (void) push_metadata(registry, ua_sess->consumer);
d88aee68 677
7972aab2
DG
678 /*
679 * Don't ask to close metadata for global per UID buffers. Close
1b532a60
DG
680 * metadata only on destroy trace session in this case. Also, the
681 * previous push metadata could have flag the metadata registry to
682 * close so don't send a close command if closed.
7972aab2 683 */
1b532a60
DG
684 if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID &&
685 !registry->metadata_closed) {
7972aab2
DG
686 /* And ask to close it for this session registry. */
687 (void) close_metadata(registry, ua_sess->consumer);
688 }
d80a6244
DG
689 }
690
bec39940
DG
691 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
692 node.node) {
693 ret = lttng_ht_del(ua_sess->channels, &iter);
525b0740 694 assert(!ret);
d0b96690 695 delete_ust_app_channel(sock, ua_chan, app);
d80a6244 696 }
d80a6244 697
7972aab2
DG
698 /* In case of per PID, the registry is kept in the session. */
699 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) {
700 struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id);
701 if (reg_pid) {
702 buffer_reg_pid_remove(reg_pid);
703 buffer_reg_pid_destroy(reg_pid);
704 }
705 }
d0b96690 706
aee6bafd 707 if (ua_sess->handle != -1) {
ffe60014
DG
708 ret = ustctl_release_handle(sock, ua_sess->handle);
709 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
710 ERR("UST app sock %d release session handle failed with ret %d",
711 sock, ret);
712 }
aee6bafd 713 }
1b532a60
DG
714 pthread_mutex_unlock(&ua_sess->lock);
715
36b588ed 716 call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu);
d80a6244 717}
91d76f53
DG
718
719/*
284d8f55
DG
720 * Delete a traceable application structure from the global list. Never call
721 * this function outside of a call_rcu call.
36b588ed
MD
722 *
723 * RCU read side lock should _NOT_ be held when calling this function.
91d76f53 724 */
8b366481
DG
725static
726void delete_ust_app(struct ust_app *app)
91d76f53 727{
8b366481 728 int ret, sock;
d42f20df 729 struct ust_app_session *ua_sess, *tmp_ua_sess;
44d3bd01 730
d80a6244 731 /* Delete ust app sessions info */
852d0037
DG
732 sock = app->sock;
733 app->sock = -1;
d80a6244 734
8b366481 735 /* Wipe sessions */
d42f20df
DG
736 cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head,
737 teardown_node) {
738 /* Free every object in the session and the session. */
36b588ed 739 rcu_read_lock();
d0b96690 740 delete_ust_app_session(sock, ua_sess, app);
36b588ed 741 rcu_read_unlock();
d80a6244 742 }
36b588ed 743
0b2dc8df
MD
744 ht_cleanup_push(app->sessions);
745 ht_cleanup_push(app->ust_objd);
d80a6244 746
6414a713 747 /*
852d0037
DG
748 * Wait until we have deleted the application from the sock hash table
749 * before closing this socket, otherwise an application could re-use the
750 * socket ID and race with the teardown, using the same hash table entry.
751 *
752 * It's OK to leave the close in call_rcu. We want it to stay unique for
753 * all RCU readers that could run concurrently with unregister app,
754 * therefore we _need_ to only close that socket after a grace period. So
755 * it should stay in this RCU callback.
756 *
757 * This close() is a very important step of the synchronization model so
758 * every modification to this function must be carefully reviewed.
6414a713 759 */
799e2c4f
MD
760 ret = close(sock);
761 if (ret) {
762 PERROR("close");
763 }
4063050c 764 lttng_fd_put(LTTNG_FD_APPS, 1);
d80a6244 765
852d0037 766 DBG2("UST app pid %d deleted", app->pid);
284d8f55 767 free(app);
099e26bd
DG
768}
769
770/*
f6a9efaa 771 * URCU intermediate call to delete an UST app.
099e26bd 772 */
8b366481
DG
773static
774void delete_ust_app_rcu(struct rcu_head *head)
099e26bd 775{
bec39940
DG
776 struct lttng_ht_node_ulong *node =
777 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa 778 struct ust_app *app =
852d0037 779 caa_container_of(node, struct ust_app, pid_n);
f6a9efaa 780
852d0037 781 DBG3("Call RCU deleting app PID %d", app->pid);
f6a9efaa 782 delete_ust_app(app);
099e26bd
DG
783}
784
ffe60014
DG
785/*
786 * Delete the session from the application ht and delete the data structure by
787 * freeing every object inside and releasing them.
788 */
d0b96690 789static void destroy_app_session(struct ust_app *app,
ffe60014
DG
790 struct ust_app_session *ua_sess)
791{
792 int ret;
793 struct lttng_ht_iter iter;
794
795 assert(app);
796 assert(ua_sess);
797
798 iter.iter.node = &ua_sess->node.node;
799 ret = lttng_ht_del(app->sessions, &iter);
800 if (ret) {
801 /* Already scheduled for teardown. */
802 goto end;
803 }
804
805 /* Once deleted, free the data structure. */
d0b96690 806 delete_ust_app_session(app->sock, ua_sess, app);
ffe60014
DG
807
808end:
809 return;
810}
811
8b366481
DG
812/*
813 * Alloc new UST app session.
814 */
815static
d0b96690 816struct ust_app_session *alloc_ust_app_session(struct ust_app *app)
8b366481
DG
817{
818 struct ust_app_session *ua_sess;
819
820 /* Init most of the default value by allocating and zeroing */
821 ua_sess = zmalloc(sizeof(struct ust_app_session));
822 if (ua_sess == NULL) {
823 PERROR("malloc");
ffe60014 824 goto error_free;
8b366481
DG
825 }
826
827 ua_sess->handle = -1;
bec39940 828 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
ad7a9107 829 ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA;
84ad93e8 830 pthread_mutex_init(&ua_sess->lock, NULL);
ad7a9107 831
8b366481
DG
832 return ua_sess;
833
ffe60014 834error_free:
8b366481
DG
835 return NULL;
836}
837
838/*
839 * Alloc new UST app channel.
840 */
841static
842struct ust_app_channel *alloc_ust_app_channel(char *name,
d0b96690 843 struct ust_app_session *ua_sess,
ffe60014 844 struct lttng_ust_channel_attr *attr)
8b366481
DG
845{
846 struct ust_app_channel *ua_chan;
847
848 /* Init most of the default value by allocating and zeroing */
849 ua_chan = zmalloc(sizeof(struct ust_app_channel));
850 if (ua_chan == NULL) {
851 PERROR("malloc");
852 goto error;
853 }
854
855 /* Setup channel name */
856 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
857 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
858
859 ua_chan->enabled = 1;
860 ua_chan->handle = -1;
45893984 861 ua_chan->session = ua_sess;
ffe60014 862 ua_chan->key = get_next_channel_key();
bec39940
DG
863 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
864 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
865 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
8b366481
DG
866
867 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
31746f93 868 CDS_INIT_LIST_HEAD(&ua_chan->ctx_list);
8b366481
DG
869
870 /* Copy attributes */
871 if (attr) {
ffe60014 872 /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */
2fe6e7f5
DG
873 ua_chan->attr.subbuf_size = attr->subbuf_size;
874 ua_chan->attr.num_subbuf = attr->num_subbuf;
875 ua_chan->attr.overwrite = attr->overwrite;
876 ua_chan->attr.switch_timer_interval = attr->switch_timer_interval;
877 ua_chan->attr.read_timer_interval = attr->read_timer_interval;
878 ua_chan->attr.output = attr->output;
8b366481 879 }
ffe60014
DG
880 /* By default, the channel is a per cpu channel. */
881 ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU;
8b366481
DG
882
883 DBG3("UST app channel %s allocated", ua_chan->name);
884
885 return ua_chan;
886
887error:
888 return NULL;
889}
890
37f1c236
DG
891/*
892 * Allocate and initialize a UST app stream.
893 *
894 * Return newly allocated stream pointer or NULL on error.
895 */
ffe60014 896struct ust_app_stream *ust_app_alloc_stream(void)
37f1c236
DG
897{
898 struct ust_app_stream *stream = NULL;
899
900 stream = zmalloc(sizeof(*stream));
901 if (stream == NULL) {
902 PERROR("zmalloc ust app stream");
903 goto error;
904 }
905
906 /* Zero could be a valid value for a handle so flag it to -1. */
907 stream->handle = -1;
908
909error:
910 return stream;
911}
912
8b366481
DG
913/*
914 * Alloc new UST app event.
915 */
916static
917struct ust_app_event *alloc_ust_app_event(char *name,
918 struct lttng_ust_event *attr)
919{
920 struct ust_app_event *ua_event;
921
922 /* Init most of the default value by allocating and zeroing */
923 ua_event = zmalloc(sizeof(struct ust_app_event));
924 if (ua_event == NULL) {
925 PERROR("malloc");
926 goto error;
927 }
928
929 ua_event->enabled = 1;
930 strncpy(ua_event->name, name, sizeof(ua_event->name));
931 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
bec39940 932 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
8b366481
DG
933
934 /* Copy attributes */
935 if (attr) {
936 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
937 }
938
939 DBG3("UST app event %s allocated", ua_event->name);
940
941 return ua_event;
942
943error:
944 return NULL;
945}
946
947/*
948 * Alloc new UST app context.
949 */
950static
951struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
952{
953 struct ust_app_ctx *ua_ctx;
954
955 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
956 if (ua_ctx == NULL) {
957 goto error;
958 }
959
31746f93
DG
960 CDS_INIT_LIST_HEAD(&ua_ctx->list);
961
8b366481
DG
962 if (uctx) {
963 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
964 }
965
966 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
967
968error:
969 return ua_ctx;
970}
971
025faf73
DG
972/*
973 * Allocate a filter and copy the given original filter.
974 *
975 * Return allocated filter or NULL on error.
976 */
977static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter(
978 struct lttng_ust_filter_bytecode *orig_f)
979{
980 struct lttng_ust_filter_bytecode *filter = NULL;
981
982 /* Copy filter bytecode */
983 filter = zmalloc(sizeof(*filter) + orig_f->len);
984 if (!filter) {
985 PERROR("zmalloc alloc ust app filter");
986 goto error;
987 }
988
989 memcpy(filter, orig_f, sizeof(*filter) + orig_f->len);
990
991error:
992 return filter;
993}
994
099e26bd 995/*
421cb601
DG
996 * Find an ust_app using the sock and return it. RCU read side lock must be
997 * held before calling this helper function.
099e26bd 998 */
f20baf8e 999struct ust_app *ust_app_find_by_sock(int sock)
099e26bd 1000{
bec39940 1001 struct lttng_ht_node_ulong *node;
bec39940 1002 struct lttng_ht_iter iter;
f6a9efaa 1003
852d0037 1004 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 1005 node = lttng_ht_iter_get_node_ulong(&iter);
f6a9efaa
DG
1006 if (node == NULL) {
1007 DBG2("UST app find by sock %d not found", sock);
f6a9efaa
DG
1008 goto error;
1009 }
852d0037
DG
1010
1011 return caa_container_of(node, struct ust_app, sock_n);
f6a9efaa
DG
1012
1013error:
1014 return NULL;
099e26bd
DG
1015}
1016
d0b96690
DG
1017/*
1018 * Find an ust_app using the notify sock and return it. RCU read side lock must
1019 * be held before calling this helper function.
1020 */
1021static struct ust_app *find_app_by_notify_sock(int sock)
1022{
1023 struct lttng_ht_node_ulong *node;
1024 struct lttng_ht_iter iter;
1025
1026 lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock),
1027 &iter);
1028 node = lttng_ht_iter_get_node_ulong(&iter);
1029 if (node == NULL) {
1030 DBG2("UST app find by notify sock %d not found", sock);
1031 goto error;
1032 }
1033
1034 return caa_container_of(node, struct ust_app, notify_sock_n);
1035
1036error:
1037 return NULL;
1038}
1039
025faf73
DG
1040/*
1041 * Lookup for an ust app event based on event name, filter bytecode and the
1042 * event loglevel.
1043 *
1044 * Return an ust_app_event object or NULL on error.
1045 */
18eace3b 1046static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht,
39c5a3a7
JI
1047 char *name, struct lttng_ust_filter_bytecode *filter, int loglevel,
1048 const struct lttng_event_exclusion *exclusion)
18eace3b
DG
1049{
1050 struct lttng_ht_iter iter;
1051 struct lttng_ht_node_str *node;
1052 struct ust_app_event *event = NULL;
1053 struct ust_app_ht_key key;
18eace3b
DG
1054
1055 assert(name);
1056 assert(ht);
1057
1058 /* Setup key for event lookup. */
1059 key.name = name;
1060 key.filter = filter;
1061 key.loglevel = loglevel;
39c5a3a7
JI
1062 /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */
1063 key.exclusion = (struct lttng_ust_event_exclusion *)exclusion;
18eace3b 1064
025faf73
DG
1065 /* Lookup using the event name as hash and a custom match fct. */
1066 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
1067 ht_match_ust_app_event, &key, &iter.iter);
18eace3b
DG
1068 node = lttng_ht_iter_get_node_str(&iter);
1069 if (node == NULL) {
1070 goto end;
1071 }
1072
1073 event = caa_container_of(node, struct ust_app_event, node);
1074
1075end:
18eace3b
DG
1076 return event;
1077}
1078
55cc08a6
DG
1079/*
1080 * Create the channel context on the tracer.
d0b96690
DG
1081 *
1082 * Called with UST app session lock held.
55cc08a6
DG
1083 */
1084static
1085int create_ust_channel_context(struct ust_app_channel *ua_chan,
1086 struct ust_app_ctx *ua_ctx, struct ust_app *app)
1087{
1088 int ret;
1089
840cb59c 1090 health_code_update();
86acf0da 1091
852d0037 1092 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
55cc08a6
DG
1093 ua_chan->obj, &ua_ctx->obj);
1094 if (ret < 0) {
ffe60014
DG
1095 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1096 ERR("UST app create channel context failed for app (pid: %d) "
1097 "with ret %d", app->pid, ret);
1098 } else {
3757b385
DG
1099 /*
1100 * This is normal behavior, an application can die during the
1101 * creation process. Don't report an error so the execution can
1102 * continue normally.
1103 */
1104 ret = 0;
ffe60014
DG
1105 DBG3("UST app disable event failed. Application is dead.");
1106 }
55cc08a6
DG
1107 goto error;
1108 }
1109
1110 ua_ctx->handle = ua_ctx->obj->handle;
1111
d0b96690
DG
1112 DBG2("UST app context handle %d created successfully for channel %s",
1113 ua_ctx->handle, ua_chan->name);
55cc08a6
DG
1114
1115error:
840cb59c 1116 health_code_update();
55cc08a6
DG
1117 return ret;
1118}
1119
53a80697
MD
1120/*
1121 * Set the filter on the tracer.
1122 */
1123static
1124int set_ust_event_filter(struct ust_app_event *ua_event,
1125 struct ust_app *app)
1126{
1127 int ret;
1128
840cb59c 1129 health_code_update();
86acf0da 1130
53a80697 1131 if (!ua_event->filter) {
86acf0da
DG
1132 ret = 0;
1133 goto error;
53a80697
MD
1134 }
1135
1136 ret = ustctl_set_filter(app->sock, ua_event->filter,
1137 ua_event->obj);
1138 if (ret < 0) {
ffe60014
DG
1139 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1140 ERR("UST app event %s filter failed for app (pid: %d) "
1141 "with ret %d", ua_event->attr.name, app->pid, ret);
1142 } else {
3757b385
DG
1143 /*
1144 * This is normal behavior, an application can die during the
1145 * creation process. Don't report an error so the execution can
1146 * continue normally.
1147 */
1148 ret = 0;
ffe60014
DG
1149 DBG3("UST app filter event failed. Application is dead.");
1150 }
53a80697
MD
1151 goto error;
1152 }
1153
1154 DBG2("UST filter set successfully for event %s", ua_event->name);
1155
1156error:
840cb59c 1157 health_code_update();
53a80697
MD
1158 return ret;
1159}
1160
7cc9a73c
JI
1161/*
1162 * Set event exclusions on the tracer.
1163 */
1164static
1165int set_ust_event_exclusion(struct ust_app_event *ua_event,
1166 struct ust_app *app)
1167{
1168 int ret;
1169
1170 health_code_update();
1171
1172 if (!ua_event->exclusion || !ua_event->exclusion->count) {
1173 ret = 0;
1174 goto error;
1175 }
1176
1177 ret = ustctl_set_exclusion(app->sock, ua_event->exclusion,
1178 ua_event->obj);
1179 if (ret < 0) {
1180 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1181 ERR("UST app event %s exclusions failed for app (pid: %d) "
1182 "with ret %d", ua_event->attr.name, app->pid, ret);
1183 } else {
1184 /*
1185 * This is normal behavior, an application can die during the
1186 * creation process. Don't report an error so the execution can
1187 * continue normally.
1188 */
1189 ret = 0;
1190 DBG3("UST app event exclusion failed. Application is dead.");
1191 }
1192 goto error;
1193 }
1194
1195 DBG2("UST exclusion set successfully for event %s", ua_event->name);
1196
1197error:
1198 health_code_update();
1199 return ret;
1200}
1201
9730260e
DG
1202/*
1203 * Disable the specified event on to UST tracer for the UST session.
1204 */
1205static int disable_ust_event(struct ust_app *app,
1206 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
1207{
1208 int ret;
1209
840cb59c 1210 health_code_update();
86acf0da 1211
852d0037 1212 ret = ustctl_disable(app->sock, ua_event->obj);
9730260e 1213 if (ret < 0) {
ffe60014
DG
1214 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1215 ERR("UST app event %s disable failed for app (pid: %d) "
1216 "and session handle %d with ret %d",
1217 ua_event->attr.name, app->pid, ua_sess->handle, ret);
1218 } else {
3757b385
DG
1219 /*
1220 * This is normal behavior, an application can die during the
1221 * creation process. Don't report an error so the execution can
1222 * continue normally.
1223 */
1224 ret = 0;
ffe60014
DG
1225 DBG3("UST app disable event failed. Application is dead.");
1226 }
9730260e
DG
1227 goto error;
1228 }
1229
1230 DBG2("UST app event %s disabled successfully for app (pid: %d)",
852d0037 1231 ua_event->attr.name, app->pid);
9730260e
DG
1232
1233error:
840cb59c 1234 health_code_update();
9730260e
DG
1235 return ret;
1236}
1237
78f0bacd
DG
1238/*
1239 * Disable the specified channel on to UST tracer for the UST session.
1240 */
1241static int disable_ust_channel(struct ust_app *app,
1242 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
1243{
1244 int ret;
1245
840cb59c 1246 health_code_update();
86acf0da 1247
852d0037 1248 ret = ustctl_disable(app->sock, ua_chan->obj);
78f0bacd 1249 if (ret < 0) {
ffe60014
DG
1250 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1251 ERR("UST app channel %s disable failed for app (pid: %d) "
1252 "and session handle %d with ret %d",
1253 ua_chan->name, app->pid, ua_sess->handle, ret);
1254 } else {
3757b385
DG
1255 /*
1256 * This is normal behavior, an application can die during the
1257 * creation process. Don't report an error so the execution can
1258 * continue normally.
1259 */
1260 ret = 0;
ffe60014
DG
1261 DBG3("UST app disable channel failed. Application is dead.");
1262 }
78f0bacd
DG
1263 goto error;
1264 }
1265
78f0bacd 1266 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
852d0037 1267 ua_chan->name, app->pid);
78f0bacd
DG
1268
1269error:
840cb59c 1270 health_code_update();
78f0bacd
DG
1271 return ret;
1272}
1273
1274/*
1275 * Enable the specified channel on to UST tracer for the UST session.
1276 */
1277static int enable_ust_channel(struct ust_app *app,
1278 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
1279{
1280 int ret;
1281
840cb59c 1282 health_code_update();
86acf0da 1283
852d0037 1284 ret = ustctl_enable(app->sock, ua_chan->obj);
78f0bacd 1285 if (ret < 0) {
ffe60014
DG
1286 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1287 ERR("UST app channel %s enable failed for app (pid: %d) "
1288 "and session handle %d with ret %d",
1289 ua_chan->name, app->pid, ua_sess->handle, ret);
1290 } else {
3757b385
DG
1291 /*
1292 * This is normal behavior, an application can die during the
1293 * creation process. Don't report an error so the execution can
1294 * continue normally.
1295 */
1296 ret = 0;
ffe60014
DG
1297 DBG3("UST app enable channel failed. Application is dead.");
1298 }
78f0bacd
DG
1299 goto error;
1300 }
1301
1302 ua_chan->enabled = 1;
1303
1304 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
852d0037 1305 ua_chan->name, app->pid);
78f0bacd
DG
1306
1307error:
840cb59c 1308 health_code_update();
78f0bacd
DG
1309 return ret;
1310}
1311
edb67388
DG
1312/*
1313 * Enable the specified event on to UST tracer for the UST session.
1314 */
1315static int enable_ust_event(struct ust_app *app,
1316 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
1317{
1318 int ret;
1319
840cb59c 1320 health_code_update();
86acf0da 1321
852d0037 1322 ret = ustctl_enable(app->sock, ua_event->obj);
edb67388 1323 if (ret < 0) {
ffe60014
DG
1324 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1325 ERR("UST app event %s enable failed for app (pid: %d) "
1326 "and session handle %d with ret %d",
1327 ua_event->attr.name, app->pid, ua_sess->handle, ret);
1328 } else {
3757b385
DG
1329 /*
1330 * This is normal behavior, an application can die during the
1331 * creation process. Don't report an error so the execution can
1332 * continue normally.
1333 */
1334 ret = 0;
ffe60014
DG
1335 DBG3("UST app enable event failed. Application is dead.");
1336 }
edb67388
DG
1337 goto error;
1338 }
1339
1340 DBG2("UST app event %s enabled successfully for app (pid: %d)",
852d0037 1341 ua_event->attr.name, app->pid);
edb67388
DG
1342
1343error:
840cb59c 1344 health_code_update();
edb67388
DG
1345 return ret;
1346}
1347
099e26bd 1348/*
7972aab2 1349 * Send channel and stream buffer to application.
4f3ab6ee 1350 *
ffe60014 1351 * Return 0 on success. On error, a negative value is returned.
4f3ab6ee 1352 */
7972aab2
DG
1353static int send_channel_pid_to_ust(struct ust_app *app,
1354 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
4f3ab6ee
DG
1355{
1356 int ret;
ffe60014 1357 struct ust_app_stream *stream, *stmp;
4f3ab6ee
DG
1358
1359 assert(app);
ffe60014 1360 assert(ua_sess);
4f3ab6ee 1361 assert(ua_chan);
4f3ab6ee 1362
840cb59c 1363 health_code_update();
4f3ab6ee 1364
7972aab2
DG
1365 DBG("UST app sending channel %s to UST app sock %d", ua_chan->name,
1366 app->sock);
86acf0da 1367
ffe60014
DG
1368 /* Send channel to the application. */
1369 ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
5b4a0ec0 1370 if (ret < 0) {
b551a063
DG
1371 goto error;
1372 }
1373
d88aee68
DG
1374 health_code_update();
1375
ffe60014
DG
1376 /* Send all streams to application. */
1377 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
1378 ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream);
1379 if (ret < 0) {
1380 goto error;
1381 }
1382 /* We don't need the stream anymore once sent to the tracer. */
1383 cds_list_del(&stream->list);
1384 delete_ust_app_stream(-1, stream);
1385 }
ffe60014
DG
1386 /* Flag the channel that it is sent to the application. */
1387 ua_chan->is_sent = 1;
ffe60014 1388
b551a063 1389error:
840cb59c 1390 health_code_update();
b551a063
DG
1391 return ret;
1392}
1393
91d76f53 1394/*
5b4a0ec0 1395 * Create the specified event onto the UST tracer for a UST session.
d0b96690
DG
1396 *
1397 * Should be called with session mutex held.
91d76f53 1398 */
edb67388
DG
1399static
1400int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
1401 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
91d76f53 1402{
5b4a0ec0 1403 int ret = 0;
284d8f55 1404
840cb59c 1405 health_code_update();
86acf0da 1406
5b4a0ec0 1407 /* Create UST event on tracer */
852d0037 1408 ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
5b4a0ec0
DG
1409 &ua_event->obj);
1410 if (ret < 0) {
ffe60014
DG
1411 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1412 ERR("Error ustctl create event %s for app pid: %d with ret %d",
1413 ua_event->attr.name, app->pid, ret);
1414 } else {
3757b385
DG
1415 /*
1416 * This is normal behavior, an application can die during the
1417 * creation process. Don't report an error so the execution can
1418 * continue normally.
1419 */
1420 ret = 0;
ffe60014
DG
1421 DBG3("UST app create event failed. Application is dead.");
1422 }
5b4a0ec0 1423 goto error;
91d76f53 1424 }
f6a9efaa 1425
5b4a0ec0 1426 ua_event->handle = ua_event->obj->handle;
284d8f55 1427
5b4a0ec0 1428 DBG2("UST app event %s created successfully for pid:%d",
852d0037 1429 ua_event->attr.name, app->pid);
f6a9efaa 1430
840cb59c 1431 health_code_update();
86acf0da 1432
025faf73
DG
1433 /* Set filter if one is present. */
1434 if (ua_event->filter) {
1435 ret = set_ust_event_filter(ua_event, app);
1436 if (ret < 0) {
1437 goto error;
1438 }
1439 }
1440
7cc9a73c
JI
1441 /* Set exclusions for the event */
1442 if (ua_event->exclusion) {
1443 ret = set_ust_event_exclusion(ua_event, app);
1444 if (ret < 0) {
1445 goto error;
1446 }
1447 }
1448
8535a6d9 1449 /* If event not enabled, disable it on the tracer */
40113787
MD
1450 if (ua_event->enabled) {
1451 /*
1452 * We now need to explicitly enable the event, since it
1453 * is now disabled at creation.
1454 */
1455 ret = enable_ust_event(app, ua_sess, ua_event);
1456 if (ret < 0) {
1457 /*
1458 * If we hit an EPERM, something is wrong with our enable call. If
1459 * we get an EEXIST, there is a problem on the tracer side since we
1460 * just created it.
1461 */
1462 switch (ret) {
1463 case -LTTNG_UST_ERR_PERM:
1464 /* Code flow problem */
1465 assert(0);
1466 case -LTTNG_UST_ERR_EXIST:
1467 /* It's OK for our use case. */
1468 ret = 0;
1469 break;
1470 default:
1471 break;
1472 }
1473 goto error;
1474 }
8535a6d9
DG
1475 }
1476
5b4a0ec0 1477error:
840cb59c 1478 health_code_update();
5b4a0ec0 1479 return ret;
91d76f53 1480}
48842b30 1481
5b4a0ec0
DG
1482/*
1483 * Copy data between an UST app event and a LTT event.
1484 */
421cb601 1485static void shadow_copy_event(struct ust_app_event *ua_event,
48842b30
DG
1486 struct ltt_ust_event *uevent)
1487{
b4ffad32
JI
1488 size_t exclusion_alloc_size;
1489
48842b30
DG
1490 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
1491 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
1492
fc34caaa
DG
1493 ua_event->enabled = uevent->enabled;
1494
5b4a0ec0
DG
1495 /* Copy event attributes */
1496 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
1497
53a80697
MD
1498 /* Copy filter bytecode */
1499 if (uevent->filter) {
025faf73
DG
1500 ua_event->filter = alloc_copy_ust_app_filter(uevent->filter);
1501 /* Filter might be NULL here in case of ENONEM. */
53a80697 1502 }
b4ffad32
JI
1503
1504 /* Copy exclusion data */
1505 if (uevent->exclusion) {
1506 exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) +
1507 LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count;
1508 ua_event->exclusion = zmalloc(exclusion_alloc_size);
5f8df26c
JI
1509 if (ua_event->exclusion == NULL) {
1510 PERROR("malloc");
1511 } else {
1512 memcpy(ua_event->exclusion, uevent->exclusion,
1513 exclusion_alloc_size);
b4ffad32
JI
1514 }
1515 }
48842b30
DG
1516}
1517
5b4a0ec0
DG
1518/*
1519 * Copy data between an UST app channel and a LTT channel.
1520 */
421cb601 1521static void shadow_copy_channel(struct ust_app_channel *ua_chan,
48842b30
DG
1522 struct ltt_ust_channel *uchan)
1523{
bec39940 1524 struct lttng_ht_iter iter;
48842b30 1525 struct ltt_ust_event *uevent;
55cc08a6 1526 struct ltt_ust_context *uctx;
48842b30 1527 struct ust_app_event *ua_event;
55cc08a6 1528 struct ust_app_ctx *ua_ctx;
48842b30 1529
fc34caaa 1530 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
48842b30
DG
1531
1532 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
1533 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
ffe60014 1534
1624d5b7
JD
1535 ua_chan->tracefile_size = uchan->tracefile_size;
1536 ua_chan->tracefile_count = uchan->tracefile_count;
1537
ffe60014
DG
1538 /* Copy event attributes since the layout is different. */
1539 ua_chan->attr.subbuf_size = uchan->attr.subbuf_size;
1540 ua_chan->attr.num_subbuf = uchan->attr.num_subbuf;
1541 ua_chan->attr.overwrite = uchan->attr.overwrite;
1542 ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval;
1543 ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval;
1544 ua_chan->attr.output = uchan->attr.output;
1545 /*
1546 * Note that the attribute channel type is not set since the channel on the
1547 * tracing registry side does not have this information.
1548 */
48842b30 1549
fc34caaa 1550 ua_chan->enabled = uchan->enabled;
7972aab2 1551 ua_chan->tracing_channel_id = uchan->id;
fc34caaa 1552
31746f93 1553 cds_list_for_each_entry(uctx, &uchan->ctx_list, list) {
55cc08a6
DG
1554 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
1555 if (ua_ctx == NULL) {
1556 continue;
1557 }
bec39940
DG
1558 lttng_ht_node_init_ulong(&ua_ctx->node,
1559 (unsigned long) ua_ctx->ctx.ctx);
aa3514e9 1560 lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node);
31746f93 1561 cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list);
55cc08a6 1562 }
48842b30 1563
421cb601 1564 /* Copy all events from ltt ust channel to ust app channel */
bec39940 1565 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
18eace3b 1566 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
39c5a3a7 1567 uevent->filter, uevent->attr.loglevel, uevent->exclusion);
18eace3b 1568 if (ua_event == NULL) {
421cb601 1569 DBG2("UST event %s not found on shadow copy channel",
48842b30 1570 uevent->attr.name);
284d8f55 1571 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
48842b30 1572 if (ua_event == NULL) {
5b4a0ec0 1573 continue;
48842b30 1574 }
421cb601 1575 shadow_copy_event(ua_event, uevent);
d0b96690 1576 add_unique_ust_app_event(ua_chan, ua_event);
48842b30 1577 }
48842b30
DG
1578 }
1579
fc34caaa 1580 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
48842b30
DG
1581}
1582
5b4a0ec0
DG
1583/*
1584 * Copy data between a UST app session and a regular LTT session.
1585 */
421cb601 1586static void shadow_copy_session(struct ust_app_session *ua_sess,
bec39940 1587 struct ltt_ust_session *usess, struct ust_app *app)
48842b30 1588{
bec39940
DG
1589 struct lttng_ht_node_str *ua_chan_node;
1590 struct lttng_ht_iter iter;
48842b30
DG
1591 struct ltt_ust_channel *uchan;
1592 struct ust_app_channel *ua_chan;
477d7741
MD
1593 time_t rawtime;
1594 struct tm *timeinfo;
1595 char datetime[16];
1596 int ret;
1597
1598 /* Get date and time for unique app path */
1599 time(&rawtime);
1600 timeinfo = localtime(&rawtime);
1601 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
48842b30 1602
421cb601 1603 DBG2("Shadow copy of session handle %d", ua_sess->handle);
48842b30 1604
7972aab2
DG
1605 ua_sess->tracing_id = usess->id;
1606 ua_sess->id = get_next_session_id();
1607 ua_sess->uid = app->uid;
1608 ua_sess->gid = app->gid;
1609 ua_sess->euid = usess->uid;
1610 ua_sess->egid = usess->gid;
1611 ua_sess->buffer_type = usess->buffer_type;
1612 ua_sess->bits_per_long = app->bits_per_long;
1613 /* There is only one consumer object per session possible. */
1614 ua_sess->consumer = usess->consumer;
2bba9e53 1615 ua_sess->output_traces = usess->output_traces;
ecc48a90 1616 ua_sess->live_timer_interval = usess->live_timer_interval;
84ad93e8
DG
1617 copy_channel_attr_to_ustctl(&ua_sess->metadata_attr,
1618 &usess->metadata_attr);
7972aab2
DG
1619
1620 switch (ua_sess->buffer_type) {
1621 case LTTNG_BUFFER_PER_PID:
1622 ret = snprintf(ua_sess->path, sizeof(ua_sess->path),
dec56f6c 1623 DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid,
7972aab2
DG
1624 datetime);
1625 break;
1626 case LTTNG_BUFFER_PER_UID:
1627 ret = snprintf(ua_sess->path, sizeof(ua_sess->path),
1628 DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long);
1629 break;
1630 default:
1631 assert(0);
1632 goto error;
1633 }
477d7741
MD
1634 if (ret < 0) {
1635 PERROR("asprintf UST shadow copy session");
477d7741 1636 assert(0);
7972aab2 1637 goto error;
477d7741
MD
1638 }
1639
48842b30 1640 /* Iterate over all channels in global domain. */
bec39940
DG
1641 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
1642 uchan, node.node) {
1643 struct lttng_ht_iter uiter;
ba767faf 1644
bec39940
DG
1645 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1646 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
5b4a0ec0 1647 if (ua_chan_node != NULL) {
fc34caaa 1648 /* Session exist. Contiuing. */
5b4a0ec0
DG
1649 continue;
1650 }
421cb601 1651
5b4a0ec0
DG
1652 DBG2("Channel %s not found on shadow session copy, creating it",
1653 uchan->name);
d0b96690 1654 ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr);
5b4a0ec0 1655 if (ua_chan == NULL) {
fc34caaa 1656 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
5b4a0ec0 1657 continue;
48842b30 1658 }
5b4a0ec0 1659 shadow_copy_channel(ua_chan, uchan);
ffe60014
DG
1660 /*
1661 * The concept of metadata channel does not exist on the tracing
1662 * registry side of the session daemon so this can only be a per CPU
1663 * channel and not metadata.
1664 */
1665 ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU;
1666
bec39940 1667 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
48842b30 1668 }
7972aab2
DG
1669
1670error:
1671 return;
48842b30
DG
1672}
1673
78f0bacd
DG
1674/*
1675 * Lookup sesison wrapper.
1676 */
84cd17c6
MD
1677static
1678void __lookup_session_by_app(struct ltt_ust_session *usess,
bec39940 1679 struct ust_app *app, struct lttng_ht_iter *iter)
84cd17c6
MD
1680{
1681 /* Get right UST app session from app */
d9bf3ca4 1682 lttng_ht_lookup(app->sessions, &usess->id, iter);
84cd17c6
MD
1683}
1684
421cb601
DG
1685/*
1686 * Return ust app session from the app session hashtable using the UST session
a991f516 1687 * id.
421cb601 1688 */
48842b30
DG
1689static struct ust_app_session *lookup_session_by_app(
1690 struct ltt_ust_session *usess, struct ust_app *app)
1691{
bec39940 1692 struct lttng_ht_iter iter;
d9bf3ca4 1693 struct lttng_ht_node_u64 *node;
48842b30 1694
84cd17c6 1695 __lookup_session_by_app(usess, app, &iter);
d9bf3ca4 1696 node = lttng_ht_iter_get_node_u64(&iter);
48842b30
DG
1697 if (node == NULL) {
1698 goto error;
1699 }
1700
1701 return caa_container_of(node, struct ust_app_session, node);
1702
1703error:
1704 return NULL;
1705}
1706
7972aab2
DG
1707/*
1708 * Setup buffer registry per PID for the given session and application. If none
1709 * is found, a new one is created, added to the global registry and
1710 * initialized. If regp is valid, it's set with the newly created object.
1711 *
1712 * Return 0 on success or else a negative value.
1713 */
1714static int setup_buffer_reg_pid(struct ust_app_session *ua_sess,
1715 struct ust_app *app, struct buffer_reg_pid **regp)
1716{
1717 int ret = 0;
1718 struct buffer_reg_pid *reg_pid;
1719
1720 assert(ua_sess);
1721 assert(app);
1722
1723 rcu_read_lock();
1724
1725 reg_pid = buffer_reg_pid_find(ua_sess->id);
1726 if (!reg_pid) {
1727 /*
1728 * This is the create channel path meaning that if there is NO
1729 * registry available, we have to create one for this session.
1730 */
1731 ret = buffer_reg_pid_create(ua_sess->id, &reg_pid);
1732 if (ret < 0) {
1733 goto error;
1734 }
1735 buffer_reg_pid_add(reg_pid);
1736 } else {
1737 goto end;
1738 }
1739
1740 /* Initialize registry. */
1741 ret = ust_registry_session_init(&reg_pid->registry->reg.ust, app,
1742 app->bits_per_long, app->uint8_t_alignment,
1743 app->uint16_t_alignment, app->uint32_t_alignment,
af6142cf
MD
1744 app->uint64_t_alignment, app->long_alignment,
1745 app->byte_order, app->version.major,
1746 app->version.minor);
7972aab2
DG
1747 if (ret < 0) {
1748 goto error;
1749 }
1750
1751 DBG3("UST app buffer registry per PID created successfully");
1752
1753end:
1754 if (regp) {
1755 *regp = reg_pid;
1756 }
1757error:
1758 rcu_read_unlock();
1759 return ret;
1760}
1761
1762/*
1763 * Setup buffer registry per UID for the given session and application. If none
1764 * is found, a new one is created, added to the global registry and
1765 * initialized. If regp is valid, it's set with the newly created object.
1766 *
1767 * Return 0 on success or else a negative value.
1768 */
1769static int setup_buffer_reg_uid(struct ltt_ust_session *usess,
1770 struct ust_app *app, struct buffer_reg_uid **regp)
1771{
1772 int ret = 0;
1773 struct buffer_reg_uid *reg_uid;
1774
1775 assert(usess);
1776 assert(app);
1777
1778 rcu_read_lock();
1779
1780 reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid);
1781 if (!reg_uid) {
1782 /*
1783 * This is the create channel path meaning that if there is NO
1784 * registry available, we have to create one for this session.
1785 */
1786 ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid,
1787 LTTNG_DOMAIN_UST, &reg_uid);
1788 if (ret < 0) {
1789 goto error;
1790 }
1791 buffer_reg_uid_add(reg_uid);
1792 } else {
1793 goto end;
1794 }
1795
1796 /* Initialize registry. */
af6142cf 1797 ret = ust_registry_session_init(&reg_uid->registry->reg.ust, NULL,
7972aab2
DG
1798 app->bits_per_long, app->uint8_t_alignment,
1799 app->uint16_t_alignment, app->uint32_t_alignment,
af6142cf
MD
1800 app->uint64_t_alignment, app->long_alignment,
1801 app->byte_order, app->version.major,
1802 app->version.minor);
7972aab2
DG
1803 if (ret < 0) {
1804 goto error;
1805 }
1806 /* Add node to teardown list of the session. */
1807 cds_list_add(&reg_uid->lnode, &usess->buffer_reg_uid_list);
1808
1809 DBG3("UST app buffer registry per UID created successfully");
1810
1811end:
1812 if (regp) {
1813 *regp = reg_uid;
1814 }
1815error:
1816 rcu_read_unlock();
1817 return ret;
1818}
1819
421cb601 1820/*
3d8ca23b 1821 * Create a session on the tracer side for the given app.
421cb601 1822 *
3d8ca23b
DG
1823 * On success, ua_sess_ptr is populated with the session pointer or else left
1824 * untouched. If the session was created, is_created is set to 1. On error,
1825 * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can
1826 * be NULL.
1827 *
1828 * Returns 0 on success or else a negative code which is either -ENOMEM or
1829 * -ENOTCONN which is the default code if the ustctl_create_session fails.
421cb601 1830 */
3d8ca23b
DG
1831static int create_ust_app_session(struct ltt_ust_session *usess,
1832 struct ust_app *app, struct ust_app_session **ua_sess_ptr,
1833 int *is_created)
421cb601 1834{
3d8ca23b 1835 int ret, created = 0;
421cb601
DG
1836 struct ust_app_session *ua_sess;
1837
3d8ca23b
DG
1838 assert(usess);
1839 assert(app);
1840 assert(ua_sess_ptr);
1841
840cb59c 1842 health_code_update();
86acf0da 1843
421cb601
DG
1844 ua_sess = lookup_session_by_app(usess, app);
1845 if (ua_sess == NULL) {
d9bf3ca4 1846 DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it",
852d0037 1847 app->pid, usess->id);
d0b96690 1848 ua_sess = alloc_ust_app_session(app);
421cb601
DG
1849 if (ua_sess == NULL) {
1850 /* Only malloc can failed so something is really wrong */
3d8ca23b
DG
1851 ret = -ENOMEM;
1852 goto error;
421cb601 1853 }
477d7741 1854 shadow_copy_session(ua_sess, usess, app);
3d8ca23b 1855 created = 1;
421cb601
DG
1856 }
1857
7972aab2
DG
1858 switch (usess->buffer_type) {
1859 case LTTNG_BUFFER_PER_PID:
1860 /* Init local registry. */
1861 ret = setup_buffer_reg_pid(ua_sess, app, NULL);
421cb601 1862 if (ret < 0) {
7972aab2
DG
1863 goto error;
1864 }
1865 break;
1866 case LTTNG_BUFFER_PER_UID:
1867 /* Look for a global registry. If none exists, create one. */
1868 ret = setup_buffer_reg_uid(usess, app, NULL);
1869 if (ret < 0) {
1870 goto error;
1871 }
1872 break;
1873 default:
1874 assert(0);
1875 ret = -EINVAL;
1876 goto error;
1877 }
1878
1879 health_code_update();
1880
1881 if (ua_sess->handle == -1) {
1882 ret = ustctl_create_session(app->sock);
1883 if (ret < 0) {
1884 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1885 ERR("Creating session for app pid %d with ret %d",
ffe60014
DG
1886 app->pid, ret);
1887 } else {
1888 DBG("UST app creating session failed. Application is dead");
3757b385
DG
1889 /*
1890 * This is normal behavior, an application can die during the
1891 * creation process. Don't report an error so the execution can
1892 * continue normally. This will get flagged ENOTCONN and the
1893 * caller will handle it.
1894 */
1895 ret = 0;
ffe60014 1896 }
d0b96690 1897 delete_ust_app_session(-1, ua_sess, app);
3d8ca23b
DG
1898 if (ret != -ENOMEM) {
1899 /*
1900 * Tracer is probably gone or got an internal error so let's
1901 * behave like it will soon unregister or not usable.
1902 */
1903 ret = -ENOTCONN;
1904 }
1905 goto error;
421cb601
DG
1906 }
1907
7972aab2
DG
1908 ua_sess->handle = ret;
1909
1910 /* Add ust app session to app's HT */
d9bf3ca4
MD
1911 lttng_ht_node_init_u64(&ua_sess->node,
1912 ua_sess->tracing_id);
1913 lttng_ht_add_unique_u64(app->sessions, &ua_sess->node);
7972aab2
DG
1914
1915 DBG2("UST app session created successfully with handle %d", ret);
1916 }
1917
1918 *ua_sess_ptr = ua_sess;
1919 if (is_created) {
1920 *is_created = created;
1921 }
1922
1923 /* Everything went well. */
1924 ret = 0;
1925
1926error:
1927 health_code_update();
1928 return ret;
1929}
1930
6a6b2068
JG
1931/*
1932 * Match function for a hash table lookup of ust_app_ctx.
1933 *
1934 * It matches an ust app context based on the context type and, in the case
1935 * of perf counters, their name.
1936 */
1937static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key)
1938{
1939 struct ust_app_ctx *ctx;
1940 const struct lttng_ust_context *key;
1941
1942 assert(node);
1943 assert(_key);
1944
1945 ctx = caa_container_of(node, struct ust_app_ctx, node.node);
1946 key = _key;
1947
1948 /* Context type */
1949 if (ctx->ctx.ctx != key->ctx) {
1950 goto no_match;
1951 }
1952
1953 /* Check the name in the case of perf thread counters. */
1954 if (key->ctx == LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER) {
1955 if (strncmp(key->u.perf_counter.name,
1956 ctx->ctx.u.perf_counter.name,
1957 sizeof(key->u.perf_counter.name))) {
1958 goto no_match;
1959 }
1960 }
1961
1962 /* Match. */
1963 return 1;
1964
1965no_match:
1966 return 0;
1967}
1968
1969/*
1970 * Lookup for an ust app context from an lttng_ust_context.
1971 *
be184a0f 1972 * Must be called while holding RCU read side lock.
6a6b2068
JG
1973 * Return an ust_app_ctx object or NULL on error.
1974 */
1975static
1976struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht,
1977 struct lttng_ust_context *uctx)
1978{
1979 struct lttng_ht_iter iter;
1980 struct lttng_ht_node_ulong *node;
1981 struct ust_app_ctx *app_ctx = NULL;
1982
1983 assert(uctx);
1984 assert(ht);
1985
1986 /* Lookup using the lttng_ust_context_type and a custom match fct. */
1987 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed),
1988 ht_match_ust_app_ctx, uctx, &iter.iter);
1989 node = lttng_ht_iter_get_node_ulong(&iter);
1990 if (!node) {
1991 goto end;
1992 }
1993
1994 app_ctx = caa_container_of(node, struct ust_app_ctx, node);
1995
1996end:
1997 return app_ctx;
1998}
1999
7972aab2
DG
2000/*
2001 * Create a context for the channel on the tracer.
2002 *
2003 * Called with UST app session lock held and a RCU read side lock.
2004 */
2005static
2006int create_ust_app_channel_context(struct ust_app_session *ua_sess,
2007 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
2008 struct ust_app *app)
2009{
2010 int ret = 0;
7972aab2
DG
2011 struct ust_app_ctx *ua_ctx;
2012
2013 DBG2("UST app adding context to channel %s", ua_chan->name);
2014
6a6b2068
JG
2015 ua_ctx = find_ust_app_context(ua_chan->ctx, uctx);
2016 if (ua_ctx) {
7972aab2
DG
2017 ret = -EEXIST;
2018 goto error;
2019 }
2020
2021 ua_ctx = alloc_ust_app_ctx(uctx);
2022 if (ua_ctx == NULL) {
2023 /* malloc failed */
2024 ret = -1;
2025 goto error;
2026 }
2027
2028 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
aa3514e9 2029 lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node);
31746f93 2030 cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list);
7972aab2
DG
2031
2032 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2033 if (ret < 0) {
2034 goto error;
2035 }
2036
2037error:
2038 return ret;
2039}
2040
2041/*
2042 * Enable on the tracer side a ust app event for the session and channel.
2043 *
2044 * Called with UST app session lock held.
2045 */
2046static
2047int enable_ust_app_event(struct ust_app_session *ua_sess,
2048 struct ust_app_event *ua_event, struct ust_app *app)
2049{
2050 int ret;
2051
2052 ret = enable_ust_event(app, ua_sess, ua_event);
2053 if (ret < 0) {
2054 goto error;
2055 }
2056
2057 ua_event->enabled = 1;
2058
2059error:
2060 return ret;
2061}
2062
2063/*
2064 * Disable on the tracer side a ust app event for the session and channel.
2065 */
2066static int disable_ust_app_event(struct ust_app_session *ua_sess,
2067 struct ust_app_event *ua_event, struct ust_app *app)
2068{
2069 int ret;
2070
2071 ret = disable_ust_event(app, ua_sess, ua_event);
2072 if (ret < 0) {
2073 goto error;
2074 }
2075
2076 ua_event->enabled = 0;
2077
2078error:
2079 return ret;
2080}
2081
2082/*
2083 * Lookup ust app channel for session and disable it on the tracer side.
2084 */
2085static
2086int disable_ust_app_channel(struct ust_app_session *ua_sess,
2087 struct ust_app_channel *ua_chan, struct ust_app *app)
2088{
2089 int ret;
2090
2091 ret = disable_ust_channel(app, ua_sess, ua_chan);
2092 if (ret < 0) {
2093 goto error;
2094 }
2095
2096 ua_chan->enabled = 0;
2097
2098error:
2099 return ret;
2100}
2101
2102/*
2103 * Lookup ust app channel for session and enable it on the tracer side. This
2104 * MUST be called with a RCU read side lock acquired.
2105 */
2106static int enable_ust_app_channel(struct ust_app_session *ua_sess,
2107 struct ltt_ust_channel *uchan, struct ust_app *app)
2108{
2109 int ret = 0;
2110 struct lttng_ht_iter iter;
2111 struct lttng_ht_node_str *ua_chan_node;
2112 struct ust_app_channel *ua_chan;
2113
2114 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2115 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2116 if (ua_chan_node == NULL) {
d9bf3ca4 2117 DBG2("Unable to find channel %s in ust session id %" PRIu64,
7972aab2
DG
2118 uchan->name, ua_sess->tracing_id);
2119 goto error;
2120 }
2121
2122 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2123
2124 ret = enable_ust_channel(app, ua_sess, ua_chan);
2125 if (ret < 0) {
2126 goto error;
2127 }
2128
2129error:
2130 return ret;
2131}
2132
2133/*
2134 * Ask the consumer to create a channel and get it if successful.
2135 *
2136 * Return 0 on success or else a negative value.
2137 */
2138static int do_consumer_create_channel(struct ltt_ust_session *usess,
2139 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan,
2140 int bitness, struct ust_registry_session *registry)
2141{
2142 int ret;
2143 unsigned int nb_fd = 0;
2144 struct consumer_socket *socket;
2145
2146 assert(usess);
2147 assert(ua_sess);
2148 assert(ua_chan);
2149 assert(registry);
2150
2151 rcu_read_lock();
2152 health_code_update();
2153
2154 /* Get the right consumer socket for the application. */
2155 socket = consumer_find_socket_by_bitness(bitness, usess->consumer);
2156 if (!socket) {
2157 ret = -EINVAL;
2158 goto error;
2159 }
2160
2161 health_code_update();
2162
2163 /* Need one fd for the channel. */
2164 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2165 if (ret < 0) {
2166 ERR("Exhausted number of available FD upon create channel");
2167 goto error;
2168 }
2169
2170 /*
2171 * Ask consumer to create channel. The consumer will return the number of
2172 * stream we have to expect.
2173 */
2174 ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket,
2175 registry);
2176 if (ret < 0) {
2177 goto error_ask;
2178 }
2179
2180 /*
2181 * Compute the number of fd needed before receiving them. It must be 2 per
2182 * stream (2 being the default value here).
2183 */
2184 nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count;
2185
2186 /* Reserve the amount of file descriptor we need. */
2187 ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd);
2188 if (ret < 0) {
2189 ERR("Exhausted number of available FD upon create channel");
2190 goto error_fd_get_stream;
2191 }
2192
2193 health_code_update();
2194
2195 /*
2196 * Now get the channel from the consumer. This call wil populate the stream
2197 * list of that channel and set the ust objects.
2198 */
d9078d0c
DG
2199 if (usess->consumer->enabled) {
2200 ret = ust_consumer_get_channel(socket, ua_chan);
2201 if (ret < 0) {
2202 goto error_destroy;
2203 }
7972aab2
DG
2204 }
2205
2206 rcu_read_unlock();
2207 return 0;
2208
2209error_destroy:
2210 lttng_fd_put(LTTNG_FD_APPS, nb_fd);
2211error_fd_get_stream:
2212 /*
2213 * Initiate a destroy channel on the consumer since we had an error
2214 * handling it on our side. The return value is of no importance since we
2215 * already have a ret value set by the previous error that we need to
2216 * return.
2217 */
2218 (void) ust_consumer_destroy_channel(socket, ua_chan);
2219error_ask:
2220 lttng_fd_put(LTTNG_FD_APPS, 1);
2221error:
2222 health_code_update();
2223 rcu_read_unlock();
2224 return ret;
2225}
2226
2227/*
2228 * Duplicate the ust data object of the ust app stream and save it in the
2229 * buffer registry stream.
2230 *
2231 * Return 0 on success or else a negative value.
2232 */
2233static int duplicate_stream_object(struct buffer_reg_stream *reg_stream,
2234 struct ust_app_stream *stream)
2235{
2236 int ret;
2237
2238 assert(reg_stream);
2239 assert(stream);
2240
2241 /* Reserve the amount of file descriptor we need. */
2242 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2243 if (ret < 0) {
2244 ERR("Exhausted number of available FD upon duplicate stream");
2245 goto error;
2246 }
2247
2248 /* Duplicate object for stream once the original is in the registry. */
2249 ret = ustctl_duplicate_ust_object_data(&stream->obj,
2250 reg_stream->obj.ust);
2251 if (ret < 0) {
2252 ERR("Duplicate stream obj from %p to %p failed with ret %d",
2253 reg_stream->obj.ust, stream->obj, ret);
2254 lttng_fd_put(LTTNG_FD_APPS, 2);
2255 goto error;
2256 }
2257 stream->handle = stream->obj->handle;
2258
2259error:
2260 return ret;
2261}
2262
2263/*
2264 * Duplicate the ust data object of the ust app. channel and save it in the
2265 * buffer registry channel.
2266 *
2267 * Return 0 on success or else a negative value.
2268 */
2269static int duplicate_channel_object(struct buffer_reg_channel *reg_chan,
2270 struct ust_app_channel *ua_chan)
2271{
2272 int ret;
2273
2274 assert(reg_chan);
2275 assert(ua_chan);
2276
2277 /* Need two fds for the channel. */
2278 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2279 if (ret < 0) {
2280 ERR("Exhausted number of available FD upon duplicate channel");
2281 goto error_fd_get;
2282 }
2283
2284 /* Duplicate object for stream once the original is in the registry. */
2285 ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust);
2286 if (ret < 0) {
2287 ERR("Duplicate channel obj from %p to %p failed with ret: %d",
2288 reg_chan->obj.ust, ua_chan->obj, ret);
2289 goto error;
2290 }
2291 ua_chan->handle = ua_chan->obj->handle;
2292
2293 return 0;
2294
2295error:
2296 lttng_fd_put(LTTNG_FD_APPS, 1);
2297error_fd_get:
2298 return ret;
2299}
2300
2301/*
2302 * For a given channel buffer registry, setup all streams of the given ust
2303 * application channel.
2304 *
2305 * Return 0 on success or else a negative value.
2306 */
2307static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan,
2308 struct ust_app_channel *ua_chan)
2309{
2310 int ret = 0;
2311 struct ust_app_stream *stream, *stmp;
2312
2313 assert(reg_chan);
2314 assert(ua_chan);
2315
2316 DBG2("UST app setup buffer registry stream");
2317
2318 /* Send all streams to application. */
2319 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
2320 struct buffer_reg_stream *reg_stream;
2321
2322 ret = buffer_reg_stream_create(&reg_stream);
2323 if (ret < 0) {
2324 goto error;
2325 }
2326
2327 /*
2328 * Keep original pointer and nullify it in the stream so the delete
2329 * stream call does not release the object.
2330 */
2331 reg_stream->obj.ust = stream->obj;
2332 stream->obj = NULL;
2333 buffer_reg_stream_add(reg_stream, reg_chan);
421cb601 2334
7972aab2
DG
2335 /* We don't need the streams anymore. */
2336 cds_list_del(&stream->list);
2337 delete_ust_app_stream(-1, stream);
2338 }
421cb601 2339
7972aab2
DG
2340error:
2341 return ret;
2342}
2343
2344/*
2345 * Create a buffer registry channel for the given session registry and
2346 * application channel object. If regp pointer is valid, it's set with the
2347 * created object. Important, the created object is NOT added to the session
2348 * registry hash table.
2349 *
2350 * Return 0 on success else a negative value.
2351 */
2352static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess,
2353 struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp)
2354{
2355 int ret;
2356 struct buffer_reg_channel *reg_chan = NULL;
2357
2358 assert(reg_sess);
2359 assert(ua_chan);
2360
2361 DBG2("UST app creating buffer registry channel for %s", ua_chan->name);
2362
2363 /* Create buffer registry channel. */
2364 ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, &reg_chan);
2365 if (ret < 0) {
2366 goto error_create;
421cb601 2367 }
7972aab2
DG
2368 assert(reg_chan);
2369 reg_chan->consumer_key = ua_chan->key;
8c924c7b 2370 reg_chan->subbuf_size = ua_chan->attr.subbuf_size;
421cb601 2371
7972aab2
DG
2372 /* Create and add a channel registry to session. */
2373 ret = ust_registry_channel_add(reg_sess->reg.ust,
2374 ua_chan->tracing_channel_id);
2375 if (ret < 0) {
2376 goto error;
d88aee68 2377 }
7972aab2 2378 buffer_reg_channel_add(reg_sess, reg_chan);
d88aee68 2379
7972aab2
DG
2380 if (regp) {
2381 *regp = reg_chan;
3d8ca23b 2382 }
d88aee68 2383
7972aab2 2384 return 0;
3d8ca23b
DG
2385
2386error:
7972aab2
DG
2387 /* Safe because the registry channel object was not added to any HT. */
2388 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
2389error_create:
3d8ca23b 2390 return ret;
421cb601
DG
2391}
2392
55cc08a6 2393/*
7972aab2
DG
2394 * Setup buffer registry channel for the given session registry and application
2395 * channel object. If regp pointer is valid, it's set with the created object.
d0b96690 2396 *
7972aab2 2397 * Return 0 on success else a negative value.
55cc08a6 2398 */
7972aab2
DG
2399static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess,
2400 struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan)
55cc08a6 2401{
7972aab2 2402 int ret;
55cc08a6 2403
7972aab2
DG
2404 assert(reg_sess);
2405 assert(reg_chan);
2406 assert(ua_chan);
2407 assert(ua_chan->obj);
55cc08a6 2408
7972aab2 2409 DBG2("UST app setup buffer registry channel for %s", ua_chan->name);
55cc08a6 2410
7972aab2
DG
2411 /* Setup all streams for the registry. */
2412 ret = setup_buffer_reg_streams(reg_chan, ua_chan);
2413 if (ret < 0) {
55cc08a6
DG
2414 goto error;
2415 }
2416
7972aab2
DG
2417 reg_chan->obj.ust = ua_chan->obj;
2418 ua_chan->obj = NULL;
55cc08a6 2419
7972aab2 2420 return 0;
55cc08a6
DG
2421
2422error:
7972aab2
DG
2423 buffer_reg_channel_remove(reg_sess, reg_chan);
2424 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
55cc08a6
DG
2425 return ret;
2426}
2427
edb67388 2428/*
7972aab2 2429 * Send buffer registry channel to the application.
d0b96690 2430 *
7972aab2 2431 * Return 0 on success else a negative value.
edb67388 2432 */
7972aab2
DG
2433static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan,
2434 struct ust_app *app, struct ust_app_session *ua_sess,
2435 struct ust_app_channel *ua_chan)
edb67388
DG
2436{
2437 int ret;
7972aab2 2438 struct buffer_reg_stream *reg_stream;
edb67388 2439
7972aab2
DG
2440 assert(reg_chan);
2441 assert(app);
2442 assert(ua_sess);
2443 assert(ua_chan);
2444
2445 DBG("UST app sending buffer registry channel to ust sock %d", app->sock);
2446
2447 ret = duplicate_channel_object(reg_chan, ua_chan);
edb67388
DG
2448 if (ret < 0) {
2449 goto error;
2450 }
2451
7972aab2
DG
2452 /* Send channel to the application. */
2453 ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
2454 if (ret < 0) {
2455 goto error;
2456 }
2457
2458 health_code_update();
2459
2460 /* Send all streams to application. */
2461 pthread_mutex_lock(&reg_chan->stream_list_lock);
2462 cds_list_for_each_entry(reg_stream, &reg_chan->streams, lnode) {
2463 struct ust_app_stream stream;
2464
2465 ret = duplicate_stream_object(reg_stream, &stream);
2466 if (ret < 0) {
2467 goto error_stream_unlock;
2468 }
2469
2470 ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream);
2471 if (ret < 0) {
8c067051 2472 (void) release_ust_app_stream(-1, &stream);
7972aab2
DG
2473 goto error_stream_unlock;
2474 }
edb67388 2475
7972aab2
DG
2476 /*
2477 * The return value is not important here. This function will output an
2478 * error if needed.
2479 */
2480 (void) release_ust_app_stream(-1, &stream);
2481 }
2482 ua_chan->is_sent = 1;
2483
2484error_stream_unlock:
2485 pthread_mutex_unlock(&reg_chan->stream_list_lock);
edb67388
DG
2486error:
2487 return ret;
2488}
2489
9730260e 2490/*
7972aab2
DG
2491 * Create and send to the application the created buffers with per UID buffers.
2492 *
2493 * Return 0 on success else a negative value.
9730260e 2494 */
7972aab2
DG
2495static int create_channel_per_uid(struct ust_app *app,
2496 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2497 struct ust_app_channel *ua_chan)
9730260e
DG
2498{
2499 int ret;
7972aab2
DG
2500 struct buffer_reg_uid *reg_uid;
2501 struct buffer_reg_channel *reg_chan;
9730260e 2502
7972aab2
DG
2503 assert(app);
2504 assert(usess);
2505 assert(ua_sess);
2506 assert(ua_chan);
2507
2508 DBG("UST app creating channel %s with per UID buffers", ua_chan->name);
2509
2510 reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid);
2511 /*
2512 * The session creation handles the creation of this global registry
2513 * object. If none can be find, there is a code flow problem or a
2514 * teardown race.
2515 */
2516 assert(reg_uid);
2517
2518 reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id,
2519 reg_uid);
2520 if (!reg_chan) {
2521 /* Create the buffer registry channel object. */
2522 ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, &reg_chan);
2523 if (ret < 0) {
f14256d6
MD
2524 ERR("Error creating the UST channel \"%s\" registry instance",
2525 ua_chan->name);
7972aab2
DG
2526 goto error;
2527 }
2528 assert(reg_chan);
2529
2530 /*
2531 * Create the buffers on the consumer side. This call populates the
2532 * ust app channel object with all streams and data object.
2533 */
2534 ret = do_consumer_create_channel(usess, ua_sess, ua_chan,
2535 app->bits_per_long, reg_uid->registry->reg.ust);
2536 if (ret < 0) {
f14256d6
MD
2537 ERR("Error creating UST channel \"%s\" on the consumer daemon",
2538 ua_chan->name);
2539
07d2ae95
DG
2540 /*
2541 * Let's remove the previously created buffer registry channel so
2542 * it's not visible anymore in the session registry.
2543 */
2544 ust_registry_channel_del_free(reg_uid->registry->reg.ust,
2545 ua_chan->tracing_channel_id);
2546 buffer_reg_channel_remove(reg_uid->registry, reg_chan);
2547 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
7972aab2
DG
2548 goto error;
2549 }
2550
2551 /*
2552 * Setup the streams and add it to the session registry.
2553 */
2554 ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan);
2555 if (ret < 0) {
f14256d6
MD
2556 ERR("Error setting up UST channel \"%s\"",
2557 ua_chan->name);
7972aab2
DG
2558 goto error;
2559 }
2560
2561 }
2562
2563 /* Send buffers to the application. */
2564 ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan);
9730260e 2565 if (ret < 0) {
f14256d6
MD
2566 /*
2567 * Don't report error to the console, since it may be
2568 * caused by application concurrently exiting.
2569 */
9730260e
DG
2570 goto error;
2571 }
2572
9730260e
DG
2573error:
2574 return ret;
2575}
2576
78f0bacd 2577/*
7972aab2
DG
2578 * Create and send to the application the created buffers with per PID buffers.
2579 *
2580 * Return 0 on success else a negative value.
78f0bacd 2581 */
7972aab2
DG
2582static int create_channel_per_pid(struct ust_app *app,
2583 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2584 struct ust_app_channel *ua_chan)
78f0bacd 2585{
8535a6d9 2586 int ret;
7972aab2 2587 struct ust_registry_session *registry;
78f0bacd 2588
7972aab2
DG
2589 assert(app);
2590 assert(usess);
2591 assert(ua_sess);
2592 assert(ua_chan);
2593
2594 DBG("UST app creating channel %s with per PID buffers", ua_chan->name);
2595
2596 rcu_read_lock();
2597
2598 registry = get_session_registry(ua_sess);
2599 assert(registry);
2600
2601 /* Create and add a new channel registry to session. */
2602 ret = ust_registry_channel_add(registry, ua_chan->key);
78f0bacd 2603 if (ret < 0) {
f14256d6
MD
2604 ERR("Error creating the UST channel \"%s\" registry instance",
2605 ua_chan->name);
78f0bacd
DG
2606 goto error;
2607 }
2608
7972aab2
DG
2609 /* Create and get channel on the consumer side. */
2610 ret = do_consumer_create_channel(usess, ua_sess, ua_chan,
2611 app->bits_per_long, registry);
2612 if (ret < 0) {
f14256d6
MD
2613 ERR("Error creating UST channel \"%s\" on the consumer daemon",
2614 ua_chan->name);
7972aab2
DG
2615 goto error;
2616 }
2617
2618 ret = send_channel_pid_to_ust(app, ua_sess, ua_chan);
2619 if (ret < 0) {
f14256d6
MD
2620 /*
2621 * Don't report error to the console, since it may be
2622 * caused by application concurrently exiting.
2623 */
7972aab2
DG
2624 goto error;
2625 }
8535a6d9 2626
78f0bacd 2627error:
7972aab2 2628 rcu_read_unlock();
78f0bacd
DG
2629 return ret;
2630}
2631
2632/*
7972aab2
DG
2633 * From an already allocated ust app channel, create the channel buffers if
2634 * need and send it to the application. This MUST be called with a RCU read
2635 * side lock acquired.
2636 *
2637 * Return 0 on success or else a negative value.
78f0bacd 2638 */
7972aab2
DG
2639static int do_create_channel(struct ust_app *app,
2640 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2641 struct ust_app_channel *ua_chan)
78f0bacd 2642{
7972aab2 2643 int ret;
78f0bacd 2644
7972aab2
DG
2645 assert(app);
2646 assert(usess);
2647 assert(ua_sess);
2648 assert(ua_chan);
2649
2650 /* Handle buffer type before sending the channel to the application. */
2651 switch (usess->buffer_type) {
2652 case LTTNG_BUFFER_PER_UID:
2653 {
2654 ret = create_channel_per_uid(app, usess, ua_sess, ua_chan);
2655 if (ret < 0) {
2656 goto error;
2657 }
2658 break;
2659 }
2660 case LTTNG_BUFFER_PER_PID:
2661 {
2662 ret = create_channel_per_pid(app, usess, ua_sess, ua_chan);
2663 if (ret < 0) {
2664 goto error;
2665 }
2666 break;
2667 }
2668 default:
2669 assert(0);
2670 ret = -EINVAL;
78f0bacd
DG
2671 goto error;
2672 }
2673
7972aab2
DG
2674 /* Initialize ust objd object using the received handle and add it. */
2675 lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle);
2676 lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node);
78f0bacd 2677
7972aab2
DG
2678 /* If channel is not enabled, disable it on the tracer */
2679 if (!ua_chan->enabled) {
2680 ret = disable_ust_channel(app, ua_sess, ua_chan);
2681 if (ret < 0) {
2682 goto error;
2683 }
78f0bacd
DG
2684 }
2685
2686error:
2687 return ret;
2688}
2689
284d8f55 2690/*
4d710ac2
DG
2691 * Create UST app channel and create it on the tracer. Set ua_chanp of the
2692 * newly created channel if not NULL.
d0b96690 2693 *
36b588ed 2694 * Called with UST app session lock and RCU read-side lock held.
7972aab2
DG
2695 *
2696 * Return 0 on success or else a negative value.
284d8f55 2697 */
4d710ac2
DG
2698static int create_ust_app_channel(struct ust_app_session *ua_sess,
2699 struct ltt_ust_channel *uchan, struct ust_app *app,
7972aab2 2700 enum lttng_ust_chan_type type, struct ltt_ust_session *usess,
4d710ac2 2701 struct ust_app_channel **ua_chanp)
5b4a0ec0
DG
2702{
2703 int ret = 0;
bec39940
DG
2704 struct lttng_ht_iter iter;
2705 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
2706 struct ust_app_channel *ua_chan;
2707
2708 /* Lookup channel in the ust app session */
bec39940
DG
2709 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2710 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
fc34caaa 2711 if (ua_chan_node != NULL) {
5b4a0ec0 2712 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
fc34caaa 2713 goto end;
5b4a0ec0
DG
2714 }
2715
d0b96690 2716 ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr);
fc34caaa
DG
2717 if (ua_chan == NULL) {
2718 /* Only malloc can fail here */
4d710ac2 2719 ret = -ENOMEM;
094d1690 2720 goto error_alloc;
fc34caaa
DG
2721 }
2722 shadow_copy_channel(ua_chan, uchan);
2723
ffe60014
DG
2724 /* Set channel type. */
2725 ua_chan->attr.type = type;
2726
7972aab2 2727 ret = do_create_channel(app, usess, ua_sess, ua_chan);
5b4a0ec0
DG
2728 if (ret < 0) {
2729 goto error;
2730 }
2731
fc34caaa 2732 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
852d0037 2733 app->pid);
fc34caaa 2734
d0b96690
DG
2735 /* Only add the channel if successful on the tracer side. */
2736 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
2737
fc34caaa 2738end:
4d710ac2
DG
2739 if (ua_chanp) {
2740 *ua_chanp = ua_chan;
2741 }
2742
2743 /* Everything went well. */
2744 return 0;
5b4a0ec0
DG
2745
2746error:
d0b96690 2747 delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app);
094d1690 2748error_alloc:
4d710ac2 2749 return ret;
5b4a0ec0
DG
2750}
2751
2752/*
2753 * Create UST app event and create it on the tracer side.
d0b96690
DG
2754 *
2755 * Called with ust app session mutex held.
5b4a0ec0 2756 */
edb67388
DG
2757static
2758int create_ust_app_event(struct ust_app_session *ua_sess,
2759 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
2760 struct ust_app *app)
284d8f55 2761{
edb67388 2762 int ret = 0;
5b4a0ec0 2763 struct ust_app_event *ua_event;
284d8f55 2764
5b4a0ec0 2765 /* Get event node */
18eace3b 2766 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
39c5a3a7 2767 uevent->filter, uevent->attr.loglevel, uevent->exclusion);
18eace3b 2768 if (ua_event != NULL) {
fc34caaa 2769 ret = -EEXIST;
edb67388
DG
2770 goto end;
2771 }
5b4a0ec0 2772
edb67388
DG
2773 /* Does not exist so create one */
2774 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
2775 if (ua_event == NULL) {
2776 /* Only malloc can failed so something is really wrong */
2777 ret = -ENOMEM;
fc34caaa 2778 goto end;
5b4a0ec0 2779 }
edb67388 2780 shadow_copy_event(ua_event, uevent);
5b4a0ec0 2781
edb67388 2782 /* Create it on the tracer side */
5b4a0ec0 2783 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 2784 if (ret < 0) {
fc34caaa 2785 /* Not found previously means that it does not exist on the tracer */
76f66f63 2786 assert(ret != -LTTNG_UST_ERR_EXIST);
284d8f55
DG
2787 goto error;
2788 }
2789
d0b96690 2790 add_unique_ust_app_event(ua_chan, ua_event);
284d8f55 2791
fc34caaa 2792 DBG2("UST app create event %s for PID %d completed", ua_event->name,
852d0037 2793 app->pid);
7f79d3a1 2794
edb67388 2795end:
fc34caaa
DG
2796 return ret;
2797
5b4a0ec0 2798error:
fc34caaa
DG
2799 /* Valid. Calling here is already in a read side lock */
2800 delete_ust_app_event(-1, ua_event);
edb67388 2801 return ret;
5b4a0ec0
DG
2802}
2803
2804/*
2805 * Create UST metadata and open it on the tracer side.
d0b96690 2806 *
7972aab2 2807 * Called with UST app session lock held and RCU read side lock.
5b4a0ec0
DG
2808 */
2809static int create_ust_app_metadata(struct ust_app_session *ua_sess,
ad7a9107 2810 struct ust_app *app, struct consumer_output *consumer)
5b4a0ec0
DG
2811{
2812 int ret = 0;
ffe60014 2813 struct ust_app_channel *metadata;
d88aee68 2814 struct consumer_socket *socket;
7972aab2 2815 struct ust_registry_session *registry;
5b4a0ec0 2816
ffe60014
DG
2817 assert(ua_sess);
2818 assert(app);
d88aee68 2819 assert(consumer);
5b4a0ec0 2820
7972aab2
DG
2821 registry = get_session_registry(ua_sess);
2822 assert(registry);
2823
1b532a60
DG
2824 /* Metadata already exists for this registry or it was closed previously */
2825 if (registry->metadata_key || registry->metadata_closed) {
7972aab2
DG
2826 ret = 0;
2827 goto error;
5b4a0ec0
DG
2828 }
2829
ffe60014 2830 /* Allocate UST metadata */
d0b96690 2831 metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL);
ffe60014
DG
2832 if (!metadata) {
2833 /* malloc() failed */
2834 ret = -ENOMEM;
2835 goto error;
2836 }
5b4a0ec0 2837
ad7a9107 2838 memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr));
5b4a0ec0 2839
7972aab2
DG
2840 /* Need one fd for the channel. */
2841 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2842 if (ret < 0) {
2843 ERR("Exhausted number of available FD upon create metadata");
2844 goto error;
2845 }
2846
4dc3dfc5
DG
2847 /* Get the right consumer socket for the application. */
2848 socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer);
2849 if (!socket) {
2850 ret = -EINVAL;
2851 goto error_consumer;
2852 }
2853
331744e3
JD
2854 /*
2855 * Keep metadata key so we can identify it on the consumer side. Assign it
2856 * to the registry *before* we ask the consumer so we avoid the race of the
2857 * consumer requesting the metadata and the ask_channel call on our side
2858 * did not returned yet.
2859 */
2860 registry->metadata_key = metadata->key;
2861
d88aee68
DG
2862 /*
2863 * Ask the metadata channel creation to the consumer. The metadata object
2864 * will be created by the consumer and kept their. However, the stream is
2865 * never added or monitored until we do a first push metadata to the
2866 * consumer.
2867 */
7972aab2
DG
2868 ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket,
2869 registry);
d88aee68 2870 if (ret < 0) {
f2a444f1
DG
2871 /* Nullify the metadata key so we don't try to close it later on. */
2872 registry->metadata_key = 0;
d88aee68
DG
2873 goto error_consumer;
2874 }
2875
2876 /*
2877 * The setup command will make the metadata stream be sent to the relayd,
2878 * if applicable, and the thread managing the metadatas. This is important
2879 * because after this point, if an error occurs, the only way the stream
2880 * can be deleted is to be monitored in the consumer.
2881 */
7972aab2 2882 ret = consumer_setup_metadata(socket, metadata->key);
ffe60014 2883 if (ret < 0) {
f2a444f1
DG
2884 /* Nullify the metadata key so we don't try to close it later on. */
2885 registry->metadata_key = 0;
d88aee68 2886 goto error_consumer;
5b4a0ec0
DG
2887 }
2888
7972aab2
DG
2889 DBG2("UST metadata with key %" PRIu64 " created for app pid %d",
2890 metadata->key, app->pid);
5b4a0ec0 2891
d88aee68 2892error_consumer:
b80f0b6c 2893 lttng_fd_put(LTTNG_FD_APPS, 1);
d88aee68 2894 delete_ust_app_channel(-1, metadata, app);
5b4a0ec0 2895error:
ffe60014 2896 return ret;
5b4a0ec0
DG
2897}
2898
5b4a0ec0 2899/*
d88aee68
DG
2900 * Return ust app pointer or NULL if not found. RCU read side lock MUST be
2901 * acquired before calling this function.
5b4a0ec0
DG
2902 */
2903struct ust_app *ust_app_find_by_pid(pid_t pid)
2904{
d88aee68 2905 struct ust_app *app = NULL;
bec39940
DG
2906 struct lttng_ht_node_ulong *node;
2907 struct lttng_ht_iter iter;
5b4a0ec0 2908
bec39940
DG
2909 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
2910 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
2911 if (node == NULL) {
2912 DBG2("UST app no found with pid %d", pid);
2913 goto error;
2914 }
5b4a0ec0
DG
2915
2916 DBG2("Found UST app by pid %d", pid);
2917
d88aee68 2918 app = caa_container_of(node, struct ust_app, pid_n);
5b4a0ec0
DG
2919
2920error:
d88aee68 2921 return app;
5b4a0ec0
DG
2922}
2923
d88aee68
DG
2924/*
2925 * Allocate and init an UST app object using the registration information and
2926 * the command socket. This is called when the command socket connects to the
2927 * session daemon.
2928 *
2929 * The object is returned on success or else NULL.
2930 */
d0b96690 2931struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock)
5b4a0ec0 2932{
d0b96690
DG
2933 struct ust_app *lta = NULL;
2934
2935 assert(msg);
2936 assert(sock >= 0);
2937
2938 DBG3("UST app creating application for socket %d", sock);
5b4a0ec0 2939
173af62f
DG
2940 if ((msg->bits_per_long == 64 &&
2941 (uatomic_read(&ust_consumerd64_fd) == -EINVAL))
2942 || (msg->bits_per_long == 32 &&
2943 (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) {
f943b0fb 2944 ERR("Registration failed: application \"%s\" (pid: %d) has "
d0b96690
DG
2945 "%d-bit long, but no consumerd for this size is available.\n",
2946 msg->name, msg->pid, msg->bits_per_long);
2947 goto error;
3f2c5fcc 2948 }
d0b96690 2949
5b4a0ec0
DG
2950 lta = zmalloc(sizeof(struct ust_app));
2951 if (lta == NULL) {
2952 PERROR("malloc");
d0b96690 2953 goto error;
5b4a0ec0
DG
2954 }
2955
2956 lta->ppid = msg->ppid;
2957 lta->uid = msg->uid;
2958 lta->gid = msg->gid;
d0b96690 2959
7753dea8 2960 lta->bits_per_long = msg->bits_per_long;
d0b96690
DG
2961 lta->uint8_t_alignment = msg->uint8_t_alignment;
2962 lta->uint16_t_alignment = msg->uint16_t_alignment;
2963 lta->uint32_t_alignment = msg->uint32_t_alignment;
2964 lta->uint64_t_alignment = msg->uint64_t_alignment;
2965 lta->long_alignment = msg->long_alignment;
2966 lta->byte_order = msg->byte_order;
2967
5b4a0ec0
DG
2968 lta->v_major = msg->major;
2969 lta->v_minor = msg->minor;
d9bf3ca4 2970 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
d0b96690
DG
2971 lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
2972 lta->notify_sock = -1;
d88aee68
DG
2973
2974 /* Copy name and make sure it's NULL terminated. */
2975 strncpy(lta->name, msg->name, sizeof(lta->name));
2976 lta->name[UST_APP_PROCNAME_LEN] = '\0';
2977
2978 /*
2979 * Before this can be called, when receiving the registration information,
2980 * the application compatibility is checked. So, at this point, the
2981 * application can work with this session daemon.
2982 */
d0b96690 2983 lta->compatible = 1;
5b4a0ec0 2984
852d0037 2985 lta->pid = msg->pid;
d0b96690 2986 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long) lta->pid);
852d0037 2987 lta->sock = sock;
d0b96690 2988 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long) lta->sock);
5b4a0ec0 2989
d42f20df
DG
2990 CDS_INIT_LIST_HEAD(&lta->teardown_head);
2991
d0b96690
DG
2992error:
2993 return lta;
2994}
2995
d88aee68
DG
2996/*
2997 * For a given application object, add it to every hash table.
2998 */
d0b96690
DG
2999void ust_app_add(struct ust_app *app)
3000{
3001 assert(app);
3002 assert(app->notify_sock >= 0);
3003
5b4a0ec0 3004 rcu_read_lock();
852d0037
DG
3005
3006 /*
3007 * On a re-registration, we want to kick out the previous registration of
3008 * that pid
3009 */
d0b96690 3010 lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n);
852d0037
DG
3011
3012 /*
3013 * The socket _should_ be unique until _we_ call close. So, a add_unique
3014 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
3015 * already in the table.
3016 */
d0b96690 3017 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n);
852d0037 3018
d0b96690
DG
3019 /* Add application to the notify socket hash table. */
3020 lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock);
3021 lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n);
5b4a0ec0 3022
d0b96690 3023 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s "
d88aee68
DG
3024 "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid,
3025 app->gid, app->sock, app->name, app->notify_sock, app->v_major,
3026 app->v_minor);
5b4a0ec0 3027
d0b96690
DG
3028 rcu_read_unlock();
3029}
3030
d88aee68
DG
3031/*
3032 * Set the application version into the object.
3033 *
3034 * Return 0 on success else a negative value either an errno code or a
3035 * LTTng-UST error code.
3036 */
d0b96690
DG
3037int ust_app_version(struct ust_app *app)
3038{
d88aee68
DG
3039 int ret;
3040
d0b96690 3041 assert(app);
d88aee68
DG
3042
3043 ret = ustctl_tracer_version(app->sock, &app->version);
3044 if (ret < 0) {
3045 if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
5368d366 3046 ERR("UST app %d version failed with ret %d", app->sock, ret);
d88aee68 3047 } else {
5368d366 3048 DBG3("UST app %d version failed. Application is dead", app->sock);
d88aee68
DG
3049 }
3050 }
3051
3052 return ret;
5b4a0ec0
DG
3053}
3054
3055/*
3056 * Unregister app by removing it from the global traceable app list and freeing
3057 * the data struct.
3058 *
3059 * The socket is already closed at this point so no close to sock.
3060 */
3061void ust_app_unregister(int sock)
3062{
3063 struct ust_app *lta;
bec39940
DG
3064 struct lttng_ht_node_ulong *node;
3065 struct lttng_ht_iter iter;
d42f20df 3066 struct ust_app_session *ua_sess;
525b0740 3067 int ret;
5b4a0ec0
DG
3068
3069 rcu_read_lock();
886459c6 3070
5b4a0ec0 3071 /* Get the node reference for a call_rcu */
852d0037 3072 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 3073 node = lttng_ht_iter_get_node_ulong(&iter);
d0b96690 3074 assert(node);
284d8f55 3075
852d0037 3076 lta = caa_container_of(node, struct ust_app, sock_n);
852d0037
DG
3077 DBG("PID %d unregistering with sock %d", lta->pid, sock);
3078
886459c6 3079 /* Remove application from PID hash table */
852d0037
DG
3080 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
3081 assert(!ret);
3082
d88aee68
DG
3083 /*
3084 * Remove application from notify hash table. The thread handling the
3085 * notify socket could have deleted the node so ignore on error because
3086 * either way it's valid. The close of that socket is handled by the other
3087 * thread.
3088 */
d0b96690 3089 iter.iter.node = &lta->notify_sock_n.node;
d88aee68 3090 (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
852d0037 3091
5b98a774
DG
3092 /*
3093 * Ignore return value since the node might have been removed before by an
3094 * add replace during app registration because the PID can be reassigned by
3095 * the OS.
3096 */
d0b96690 3097 iter.iter.node = &lta->pid_n.node;
bec39940 3098 ret = lttng_ht_del(ust_app_ht, &iter);
5b98a774
DG
3099 if (ret) {
3100 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
3101 lta->pid);
3102 }
852d0037 3103
d42f20df
DG
3104 /* Remove sessions so they are not visible during deletion.*/
3105 cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess,
3106 node.node) {
7972aab2
DG
3107 struct ust_registry_session *registry;
3108
d42f20df
DG
3109 ret = lttng_ht_del(lta->sessions, &iter);
3110 if (ret) {
3111 /* The session was already removed so scheduled for teardown. */
3112 continue;
3113 }
3114
3115 /*
3116 * Add session to list for teardown. This is safe since at this point we
3117 * are the only one using this list.
3118 */
d88aee68
DG
3119 pthread_mutex_lock(&ua_sess->lock);
3120
3121 /*
3122 * Normally, this is done in the delete session process which is
3123 * executed in the call rcu below. However, upon registration we can't
3124 * afford to wait for the grace period before pushing data or else the
3125 * data pending feature can race between the unregistration and stop
3126 * command where the data pending command is sent *before* the grace
3127 * period ended.
3128 *
3129 * The close metadata below nullifies the metadata pointer in the
3130 * session so the delete session will NOT push/close a second time.
3131 */
7972aab2 3132 registry = get_session_registry(ua_sess);
1b532a60 3133 if (registry && !registry->metadata_closed) {
7972aab2
DG
3134 /* Push metadata for application before freeing the application. */
3135 (void) push_metadata(registry, ua_sess->consumer);
3136
3137 /*
3138 * Don't ask to close metadata for global per UID buffers. Close
1b532a60
DG
3139 * metadata only on destroy trace session in this case. Also, the
3140 * previous push metadata could have flag the metadata registry to
3141 * close so don't send a close command if closed.
7972aab2 3142 */
1b532a60
DG
3143 if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID &&
3144 !registry->metadata_closed) {
7972aab2
DG
3145 /* And ask to close it for this session registry. */
3146 (void) close_metadata(registry, ua_sess->consumer);
3147 }
3148 }
d88aee68 3149
d42f20df 3150 cds_list_add(&ua_sess->teardown_node, &lta->teardown_head);
d88aee68 3151 pthread_mutex_unlock(&ua_sess->lock);
d42f20df
DG
3152 }
3153
852d0037
DG
3154 /* Free memory */
3155 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
3156
5b4a0ec0
DG
3157 rcu_read_unlock();
3158 return;
284d8f55
DG
3159}
3160
5b4a0ec0
DG
3161/*
3162 * Fill events array with all events name of all registered apps.
3163 */
3164int ust_app_list_events(struct lttng_event **events)
421cb601 3165{
5b4a0ec0
DG
3166 int ret, handle;
3167 size_t nbmem, count = 0;
bec39940 3168 struct lttng_ht_iter iter;
5b4a0ec0 3169 struct ust_app *app;
c617c0c6 3170 struct lttng_event *tmp_event;
421cb601 3171
5b4a0ec0 3172 nbmem = UST_APP_EVENT_LIST_SIZE;
c617c0c6
MD
3173 tmp_event = zmalloc(nbmem * sizeof(struct lttng_event));
3174 if (tmp_event == NULL) {
5b4a0ec0
DG
3175 PERROR("zmalloc ust app events");
3176 ret = -ENOMEM;
421cb601
DG
3177 goto error;
3178 }
3179
5b4a0ec0 3180 rcu_read_lock();
421cb601 3181
852d0037 3182 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
90eaa0d2 3183 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 3184
840cb59c 3185 health_code_update();
86acf0da 3186
e0c7ec2b
DG
3187 if (!app->compatible) {
3188 /*
3189 * TODO: In time, we should notice the caller of this error by
3190 * telling him that this is a version error.
3191 */
3192 continue;
3193 }
852d0037 3194 handle = ustctl_tracepoint_list(app->sock);
5b4a0ec0 3195 if (handle < 0) {
ffe60014
DG
3196 if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) {
3197 ERR("UST app list events getting handle failed for app pid %d",
3198 app->pid);
3199 }
5b4a0ec0
DG
3200 continue;
3201 }
421cb601 3202
852d0037 3203 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
fb54cdbf 3204 &uiter)) != -LTTNG_UST_ERR_NOENT) {
ffe60014
DG
3205 /* Handle ustctl error. */
3206 if (ret < 0) {
a2ba1ab0 3207 if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
ffe60014
DG
3208 ERR("UST app tp list get failed for app %d with ret %d",
3209 app->sock, ret);
3210 } else {
3211 DBG3("UST app tp list get failed. Application is dead");
3757b385
DG
3212 /*
3213 * This is normal behavior, an application can die during the
3214 * creation process. Don't report an error so the execution can
3215 * continue normally. Continue normal execution.
3216 */
3217 break;
ffe60014 3218 }
98f595d4 3219 free(tmp_event);
ffe60014
DG
3220 goto rcu_error;
3221 }
3222
840cb59c 3223 health_code_update();
815564d8 3224 if (count >= nbmem) {
d7b3776f 3225 /* In case the realloc fails, we free the memory */
53efb85a
MD
3226 struct lttng_event *new_tmp_event;
3227 size_t new_nbmem;
3228
3229 new_nbmem = nbmem << 1;
3230 DBG2("Reallocating event list from %zu to %zu entries",
3231 nbmem, new_nbmem);
3232 new_tmp_event = realloc(tmp_event,
3233 new_nbmem * sizeof(struct lttng_event));
3234 if (new_tmp_event == NULL) {
5b4a0ec0 3235 PERROR("realloc ust app events");
c617c0c6 3236 free(tmp_event);
5b4a0ec0
DG
3237 ret = -ENOMEM;
3238 goto rcu_error;
3239 }
53efb85a
MD
3240 /* Zero the new memory */
3241 memset(new_tmp_event + nbmem, 0,
3242 (new_nbmem - nbmem) * sizeof(struct lttng_event));
3243 nbmem = new_nbmem;
3244 tmp_event = new_tmp_event;
5b4a0ec0 3245 }
c617c0c6
MD
3246 memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
3247 tmp_event[count].loglevel = uiter.loglevel;
3248 tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
3249 tmp_event[count].pid = app->pid;
3250 tmp_event[count].enabled = -1;
5b4a0ec0 3251 count++;
421cb601 3252 }
421cb601
DG
3253 }
3254
5b4a0ec0 3255 ret = count;
c617c0c6 3256 *events = tmp_event;
421cb601 3257
5b4a0ec0 3258 DBG2("UST app list events done (%zu events)", count);
421cb601 3259
5b4a0ec0
DG
3260rcu_error:
3261 rcu_read_unlock();
421cb601 3262error:
840cb59c 3263 health_code_update();
5b4a0ec0 3264 return ret;
421cb601
DG
3265}
3266
f37d259d
MD
3267/*
3268 * Fill events array with all events name of all registered apps.
3269 */
3270int ust_app_list_event_fields(struct lttng_event_field **fields)
3271{
3272 int ret, handle;
3273 size_t nbmem, count = 0;
3274 struct lttng_ht_iter iter;
3275 struct ust_app *app;
c617c0c6 3276 struct lttng_event_field *tmp_event;
f37d259d
MD
3277
3278 nbmem = UST_APP_EVENT_LIST_SIZE;
c617c0c6
MD
3279 tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field));
3280 if (tmp_event == NULL) {
f37d259d
MD
3281 PERROR("zmalloc ust app event fields");
3282 ret = -ENOMEM;
3283 goto error;
3284 }
3285
3286 rcu_read_lock();
3287
3288 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
3289 struct lttng_ust_field_iter uiter;
3290
840cb59c 3291 health_code_update();
86acf0da 3292
f37d259d
MD
3293 if (!app->compatible) {
3294 /*
3295 * TODO: In time, we should notice the caller of this error by
3296 * telling him that this is a version error.
3297 */
3298 continue;
3299 }
3300 handle = ustctl_tracepoint_field_list(app->sock);
3301 if (handle < 0) {
ffe60014
DG
3302 if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) {
3303 ERR("UST app list field getting handle failed for app pid %d",
3304 app->pid);
3305 }
f37d259d
MD
3306 continue;
3307 }
3308
3309 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
fb54cdbf 3310 &uiter)) != -LTTNG_UST_ERR_NOENT) {
ffe60014
DG
3311 /* Handle ustctl error. */
3312 if (ret < 0) {
a2ba1ab0 3313 if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
ffe60014
DG
3314 ERR("UST app tp list field failed for app %d with ret %d",
3315 app->sock, ret);
3316 } else {
3317 DBG3("UST app tp list field failed. Application is dead");
3757b385
DG
3318 /*
3319 * This is normal behavior, an application can die during the
3320 * creation process. Don't report an error so the execution can
98f595d4 3321 * continue normally. Reset list and count for next app.
3757b385
DG
3322 */
3323 break;
ffe60014 3324 }
98f595d4 3325 free(tmp_event);
ffe60014
DG
3326 goto rcu_error;
3327 }
3328
840cb59c 3329 health_code_update();
f37d259d 3330 if (count >= nbmem) {
d7b3776f 3331 /* In case the realloc fails, we free the memory */
53efb85a
MD
3332 struct lttng_event_field *new_tmp_event;
3333 size_t new_nbmem;
3334
3335 new_nbmem = nbmem << 1;
3336 DBG2("Reallocating event field list from %zu to %zu entries",
3337 nbmem, new_nbmem);
3338 new_tmp_event = realloc(tmp_event,
3339 new_nbmem * sizeof(struct lttng_event_field));
3340 if (new_tmp_event == NULL) {
f37d259d 3341 PERROR("realloc ust app event fields");
c617c0c6 3342 free(tmp_event);
f37d259d
MD
3343 ret = -ENOMEM;
3344 goto rcu_error;
3345 }
53efb85a
MD
3346 /* Zero the new memory */
3347 memset(new_tmp_event + nbmem, 0,
3348 (new_nbmem - nbmem) * sizeof(struct lttng_event_field));
3349 nbmem = new_nbmem;
3350 tmp_event = new_tmp_event;
f37d259d 3351 }
f37d259d 3352
c617c0c6 3353 memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
2e84128e
DG
3354 /* Mapping between these enums matches 1 to 1. */
3355 tmp_event[count].type = (enum lttng_event_field_type) uiter.type;
c617c0c6 3356 tmp_event[count].nowrite = uiter.nowrite;
f37d259d 3357
c617c0c6
MD
3358 memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
3359 tmp_event[count].event.loglevel = uiter.loglevel;
2e84128e 3360 tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT;
c617c0c6
MD
3361 tmp_event[count].event.pid = app->pid;
3362 tmp_event[count].event.enabled = -1;
f37d259d
MD
3363 count++;
3364 }
3365 }
3366
3367 ret = count;
c617c0c6 3368 *fields = tmp_event;
f37d259d
MD
3369
3370 DBG2("UST app list event fields done (%zu events)", count);
3371
3372rcu_error:
3373 rcu_read_unlock();
3374error:
840cb59c 3375 health_code_update();
f37d259d
MD
3376 return ret;
3377}
3378
5b4a0ec0
DG
3379/*
3380 * Free and clean all traceable apps of the global list.
36b588ed
MD
3381 *
3382 * Should _NOT_ be called with RCU read-side lock held.
5b4a0ec0
DG
3383 */
3384void ust_app_clean_list(void)
421cb601 3385{
5b4a0ec0 3386 int ret;
659ed79f 3387 struct ust_app *app;
bec39940 3388 struct lttng_ht_iter iter;
421cb601 3389
5b4a0ec0 3390 DBG2("UST app cleaning registered apps hash table");
421cb601 3391
5b4a0ec0 3392 rcu_read_lock();
421cb601 3393
659ed79f 3394 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 3395 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 3396 assert(!ret);
659ed79f 3397 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
421cb601
DG
3398 }
3399
852d0037 3400 /* Cleanup socket hash table */
659ed79f
DG
3401 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app,
3402 sock_n.node) {
852d0037 3403 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
bec39940
DG
3404 assert(!ret);
3405 }
852d0037 3406
d88aee68
DG
3407 /* Cleanup notify socket hash table */
3408 cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app,
3409 notify_sock_n.node) {
3410 ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
3411 assert(!ret);
3412 }
36b588ed 3413 rcu_read_unlock();
d88aee68 3414
bec39940 3415 /* Destroy is done only when the ht is empty */
0b2dc8df
MD
3416 ht_cleanup_push(ust_app_ht);
3417 ht_cleanup_push(ust_app_ht_by_sock);
3418 ht_cleanup_push(ust_app_ht_by_notify_sock);
5b4a0ec0
DG
3419}
3420
3421/*
3422 * Init UST app hash table.
3423 */
3424void ust_app_ht_alloc(void)
3425{
bec39940 3426 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
852d0037 3427 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
d0b96690 3428 ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
421cb601
DG
3429}
3430
78f0bacd
DG
3431/*
3432 * For a specific UST session, disable the channel for all registered apps.
3433 */
35a9059d 3434int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
3435 struct ltt_ust_channel *uchan)
3436{
3437 int ret = 0;
bec39940
DG
3438 struct lttng_ht_iter iter;
3439 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
3440 struct ust_app *app;
3441 struct ust_app_session *ua_sess;
8535a6d9 3442 struct ust_app_channel *ua_chan;
78f0bacd
DG
3443
3444 if (usess == NULL || uchan == NULL) {
3445 ERR("Disabling UST global channel with NULL values");
3446 ret = -1;
3447 goto error;
3448 }
3449
d9bf3ca4 3450 DBG2("UST app disabling channel %s from global domain for session id %" PRIu64,
a991f516 3451 uchan->name, usess->id);
78f0bacd
DG
3452
3453 rcu_read_lock();
3454
3455 /* For every registered applications */
852d0037 3456 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 3457 struct lttng_ht_iter uiter;
e0c7ec2b
DG
3458 if (!app->compatible) {
3459 /*
3460 * TODO: In time, we should notice the caller of this error by
3461 * telling him that this is a version error.
3462 */
3463 continue;
3464 }
78f0bacd
DG
3465 ua_sess = lookup_session_by_app(usess, app);
3466 if (ua_sess == NULL) {
3467 continue;
3468 }
3469
8535a6d9 3470 /* Get channel */
bec39940
DG
3471 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
3472 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9
DG
3473 /* If the session if found for the app, the channel must be there */
3474 assert(ua_chan_node);
3475
3476 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
3477 /* The channel must not be already disabled */
3478 assert(ua_chan->enabled == 1);
3479
3480 /* Disable channel onto application */
3481 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
3482 if (ret < 0) {
3483 /* XXX: We might want to report this error at some point... */
3484 continue;
3485 }
3486 }
3487
3488 rcu_read_unlock();
3489
3490error:
3491 return ret;
3492}
3493
3494/*
3495 * For a specific UST session, enable the channel for all registered apps.
3496 */
35a9059d 3497int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
3498 struct ltt_ust_channel *uchan)
3499{
3500 int ret = 0;
bec39940 3501 struct lttng_ht_iter iter;
78f0bacd
DG
3502 struct ust_app *app;
3503 struct ust_app_session *ua_sess;
3504
3505 if (usess == NULL || uchan == NULL) {
3506 ERR("Adding UST global channel to NULL values");
3507 ret = -1;
3508 goto error;
3509 }
3510
d9bf3ca4 3511 DBG2("UST app enabling channel %s to global domain for session id %" PRIu64,
a991f516 3512 uchan->name, usess->id);
78f0bacd
DG
3513
3514 rcu_read_lock();
3515
3516 /* For every registered applications */
852d0037 3517 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
3518 if (!app->compatible) {
3519 /*
3520 * TODO: In time, we should notice the caller of this error by
3521 * telling him that this is a version error.
3522 */
3523 continue;
3524 }
78f0bacd
DG
3525 ua_sess = lookup_session_by_app(usess, app);
3526 if (ua_sess == NULL) {
3527 continue;
3528 }
3529
3530 /* Enable channel onto application */
3531 ret = enable_ust_app_channel(ua_sess, uchan, app);
3532 if (ret < 0) {
3533 /* XXX: We might want to report this error at some point... */
3534 continue;
3535 }
3536 }
3537
3538 rcu_read_unlock();
3539
3540error:
3541 return ret;
3542}
3543
b0a40d28
DG
3544/*
3545 * Disable an event in a channel and for a specific session.
3546 */
35a9059d
DG
3547int ust_app_disable_event_glb(struct ltt_ust_session *usess,
3548 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
b0a40d28
DG
3549{
3550 int ret = 0;
bec39940
DG
3551 struct lttng_ht_iter iter, uiter;
3552 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
b0a40d28
DG
3553 struct ust_app *app;
3554 struct ust_app_session *ua_sess;
3555 struct ust_app_channel *ua_chan;
3556 struct ust_app_event *ua_event;
3557
3558 DBG("UST app disabling event %s for all apps in channel "
d9bf3ca4
MD
3559 "%s for session id %" PRIu64,
3560 uevent->attr.name, uchan->name, usess->id);
b0a40d28
DG
3561
3562 rcu_read_lock();
3563
3564 /* For all registered applications */
852d0037 3565 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
3566 if (!app->compatible) {
3567 /*
3568 * TODO: In time, we should notice the caller of this error by
3569 * telling him that this is a version error.
3570 */
3571 continue;
3572 }
b0a40d28
DG
3573 ua_sess = lookup_session_by_app(usess, app);
3574 if (ua_sess == NULL) {
3575 /* Next app */
3576 continue;
3577 }
3578
3579 /* Lookup channel in the ust app session */
bec39940
DG
3580 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
3581 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28 3582 if (ua_chan_node == NULL) {
d9bf3ca4 3583 DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d."
852d0037 3584 "Skipping", uchan->name, usess->id, app->pid);
b0a40d28
DG
3585 continue;
3586 }
3587 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
3588
bec39940
DG
3589 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
3590 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28
DG
3591 if (ua_event_node == NULL) {
3592 DBG2("Event %s not found in channel %s for app pid %d."
852d0037 3593 "Skipping", uevent->attr.name, uchan->name, app->pid);
b0a40d28
DG
3594 continue;
3595 }
3596 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
3597
7f79d3a1 3598 ret = disable_ust_app_event(ua_sess, ua_event, app);
b0a40d28
DG
3599 if (ret < 0) {
3600 /* XXX: Report error someday... */
3601 continue;
3602 }
3603 }
3604
3605 rcu_read_unlock();
3606
3607 return ret;
3608}
3609
421cb601 3610/*
5b4a0ec0 3611 * For a specific UST session, create the channel for all registered apps.
421cb601 3612 */
35a9059d 3613int ust_app_create_channel_glb(struct ltt_ust_session *usess,
48842b30
DG
3614 struct ltt_ust_channel *uchan)
3615{
3d8ca23b 3616 int ret = 0, created;
bec39940 3617 struct lttng_ht_iter iter;
48842b30 3618 struct ust_app *app;
3d8ca23b 3619 struct ust_app_session *ua_sess = NULL;
48842b30 3620
fc34caaa
DG
3621 /* Very wrong code flow */
3622 assert(usess);
3623 assert(uchan);
421cb601 3624
d9bf3ca4 3625 DBG2("UST app adding channel %s to UST domain for session id %" PRIu64,
a991f516 3626 uchan->name, usess->id);
48842b30
DG
3627
3628 rcu_read_lock();
421cb601 3629
5b4a0ec0 3630 /* For every registered applications */
852d0037 3631 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
3632 if (!app->compatible) {
3633 /*
3634 * TODO: In time, we should notice the caller of this error by
3635 * telling him that this is a version error.
3636 */
3637 continue;
3638 }
edb67388
DG
3639 /*
3640 * Create session on the tracer side and add it to app session HT. Note
3641 * that if session exist, it will simply return a pointer to the ust
3642 * app session.
3643 */
3d8ca23b
DG
3644 ret = create_ust_app_session(usess, app, &ua_sess, &created);
3645 if (ret < 0) {
3646 switch (ret) {
3647 case -ENOTCONN:
3648 /*
3649 * The application's socket is not valid. Either a bad socket
3650 * or a timeout on it. We can't inform the caller that for a
3651 * specific app, the session failed so lets continue here.
3652 */
3653 continue;
3654 case -ENOMEM:
3655 default:
3656 goto error_rcu_unlock;
3657 }
48842b30 3658 }
3d8ca23b 3659 assert(ua_sess);
48842b30 3660
d0b96690 3661 pthread_mutex_lock(&ua_sess->lock);
d65d2de8
DG
3662 if (!strncmp(uchan->name, DEFAULT_METADATA_NAME,
3663 sizeof(uchan->name))) {
ad7a9107
DG
3664 copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr);
3665 ret = 0;
d65d2de8
DG
3666 } else {
3667 /* Create channel onto application. We don't need the chan ref. */
3668 ret = create_ust_app_channel(ua_sess, uchan, app,
3669 LTTNG_UST_CHAN_PER_CPU, usess, NULL);
3670 }
d0b96690 3671 pthread_mutex_unlock(&ua_sess->lock);
3d8ca23b
DG
3672 if (ret < 0) {
3673 if (ret == -ENOMEM) {
3674 /* No more memory is a fatal error. Stop right now. */
3675 goto error_rcu_unlock;
3676 }
3677 /* Cleanup the created session if it's the case. */
3678 if (created) {
d0b96690 3679 destroy_app_session(app, ua_sess);
3d8ca23b 3680 }
48842b30 3681 }
48842b30 3682 }
5b4a0ec0 3683
95e047ff 3684error_rcu_unlock:
48842b30 3685 rcu_read_unlock();
3c14c33f 3686 return ret;
48842b30
DG
3687}
3688
5b4a0ec0 3689/*
edb67388 3690 * Enable event for a specific session and channel on the tracer.
5b4a0ec0 3691 */
35a9059d 3692int ust_app_enable_event_glb(struct ltt_ust_session *usess,
48842b30
DG
3693 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
3694{
3695 int ret = 0;
bec39940 3696 struct lttng_ht_iter iter, uiter;
18eace3b 3697 struct lttng_ht_node_str *ua_chan_node;
48842b30
DG
3698 struct ust_app *app;
3699 struct ust_app_session *ua_sess;
3700 struct ust_app_channel *ua_chan;
3701 struct ust_app_event *ua_event;
48842b30 3702
d9bf3ca4 3703 DBG("UST app enabling event %s for all apps for session id %" PRIu64,
a991f516 3704 uevent->attr.name, usess->id);
48842b30 3705
edb67388
DG
3706 /*
3707 * NOTE: At this point, this function is called only if the session and
3708 * channel passed are already created for all apps. and enabled on the
3709 * tracer also.
3710 */
3711
48842b30 3712 rcu_read_lock();
421cb601
DG
3713
3714 /* For all registered applications */
852d0037 3715 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
3716 if (!app->compatible) {
3717 /*
3718 * TODO: In time, we should notice the caller of this error by
3719 * telling him that this is a version error.
3720 */
3721 continue;
3722 }
edb67388 3723 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
3724 if (!ua_sess) {
3725 /* The application has problem or is probably dead. */
3726 continue;
3727 }
ba767faf 3728
d0b96690
DG
3729 pthread_mutex_lock(&ua_sess->lock);
3730
edb67388 3731 /* Lookup channel in the ust app session */
bec39940
DG
3732 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
3733 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
3734 /* If the channel is not found, there is a code flow error */
3735 assert(ua_chan_node);
3736
3737 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
3738
18eace3b
DG
3739 /* Get event node */
3740 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
39c5a3a7 3741 uevent->filter, uevent->attr.loglevel, uevent->exclusion);
18eace3b 3742 if (ua_event == NULL) {
7f79d3a1 3743 DBG3("UST app enable event %s not found for app PID %d."
852d0037 3744 "Skipping app", uevent->attr.name, app->pid);
d0b96690 3745 goto next_app;
35a9059d 3746 }
35a9059d
DG
3747
3748 ret = enable_ust_app_event(ua_sess, ua_event, app);
3749 if (ret < 0) {
d0b96690 3750 pthread_mutex_unlock(&ua_sess->lock);
7f79d3a1 3751 goto error;
48842b30 3752 }
d0b96690
DG
3753 next_app:
3754 pthread_mutex_unlock(&ua_sess->lock);
edb67388
DG
3755 }
3756
7f79d3a1 3757error:
edb67388 3758 rcu_read_unlock();
edb67388
DG
3759 return ret;
3760}
3761
3762/*
3763 * For a specific existing UST session and UST channel, creates the event for
3764 * all registered apps.
3765 */
35a9059d 3766int ust_app_create_event_glb(struct ltt_ust_session *usess,
edb67388
DG
3767 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
3768{
3769 int ret = 0;
bec39940
DG
3770 struct lttng_ht_iter iter, uiter;
3771 struct lttng_ht_node_str *ua_chan_node;
edb67388
DG
3772 struct ust_app *app;
3773 struct ust_app_session *ua_sess;
3774 struct ust_app_channel *ua_chan;
3775
d9bf3ca4 3776 DBG("UST app creating event %s for all apps for session id %" PRIu64,
a991f516 3777 uevent->attr.name, usess->id);
edb67388 3778
edb67388
DG
3779 rcu_read_lock();
3780
3781 /* For all registered applications */
852d0037 3782 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
3783 if (!app->compatible) {
3784 /*
3785 * TODO: In time, we should notice the caller of this error by
3786 * telling him that this is a version error.
3787 */
3788 continue;
3789 }
edb67388 3790 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
3791 if (!ua_sess) {
3792 /* The application has problem or is probably dead. */
3793 continue;
3794 }
48842b30 3795
d0b96690 3796 pthread_mutex_lock(&ua_sess->lock);
48842b30 3797 /* Lookup channel in the ust app session */
bec39940
DG
3798 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
3799 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
3800 /* If the channel is not found, there is a code flow error */
3801 assert(ua_chan_node);
3802
48842b30
DG
3803 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
3804
edb67388 3805 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
d0b96690 3806 pthread_mutex_unlock(&ua_sess->lock);
edb67388 3807 if (ret < 0) {
49c336c1 3808 if (ret != -LTTNG_UST_ERR_EXIST) {
fc34caaa
DG
3809 /* Possible value at this point: -ENOMEM. If so, we stop! */
3810 break;
3811 }
3812 DBG2("UST app event %s already exist on app PID %d",
852d0037 3813 uevent->attr.name, app->pid);
5b4a0ec0 3814 continue;
48842b30 3815 }
48842b30 3816 }
5b4a0ec0 3817
48842b30
DG
3818 rcu_read_unlock();
3819
3820 return ret;
3821}
3822
5b4a0ec0
DG
3823/*
3824 * Start tracing for a specific UST session and app.
3825 */
b34cbebf 3826static
421cb601 3827int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
48842b30
DG
3828{
3829 int ret = 0;
48842b30 3830 struct ust_app_session *ua_sess;
48842b30 3831
852d0037 3832 DBG("Starting tracing for ust app pid %d", app->pid);
5cf5d0e7 3833
509cbaf8
MD
3834 rcu_read_lock();
3835
e0c7ec2b
DG
3836 if (!app->compatible) {
3837 goto end;
3838 }
3839
421cb601
DG
3840 ua_sess = lookup_session_by_app(usess, app);
3841 if (ua_sess == NULL) {
d42f20df
DG
3842 /* The session is in teardown process. Ignore and continue. */
3843 goto end;
421cb601 3844 }
48842b30 3845
d0b96690
DG
3846 pthread_mutex_lock(&ua_sess->lock);
3847
aea829b3
DG
3848 /* Upon restart, we skip the setup, already done */
3849 if (ua_sess->started) {
8be98f9a 3850 goto skip_setup;
aea829b3 3851 }
8be98f9a 3852
a4b92340
DG
3853 /* Create directories if consumer is LOCAL and has a path defined. */
3854 if (usess->consumer->type == CONSUMER_DST_LOCAL &&
3855 strlen(usess->consumer->dst.trace_path) > 0) {
3856 ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path,
7972aab2 3857 S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid);
a4b92340
DG
3858 if (ret < 0) {
3859 if (ret != -EEXIST) {
3860 ERR("Trace directory creation error");
d0b96690 3861 goto error_unlock;
421cb601 3862 }
173af62f 3863 }
7753dea8 3864 }
aea829b3 3865
d65d2de8
DG
3866 /*
3867 * Create the metadata for the application. This returns gracefully if a
3868 * metadata was already set for the session.
3869 */
ad7a9107 3870 ret = create_ust_app_metadata(ua_sess, app, usess->consumer);
421cb601 3871 if (ret < 0) {
d0b96690 3872 goto error_unlock;
421cb601 3873 }
48842b30 3874
840cb59c 3875 health_code_update();
86acf0da 3876
8be98f9a 3877skip_setup:
421cb601 3878 /* This start the UST tracing */
852d0037 3879 ret = ustctl_start_session(app->sock, ua_sess->handle);
421cb601 3880 if (ret < 0) {
ffe60014
DG
3881 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
3882 ERR("Error starting tracing for app pid: %d (ret: %d)",
3883 app->pid, ret);
3884 } else {
3885 DBG("UST app start session failed. Application is dead.");
3757b385
DG
3886 /*
3887 * This is normal behavior, an application can die during the
3888 * creation process. Don't report an error so the execution can
3889 * continue normally.
3890 */
3891 pthread_mutex_unlock(&ua_sess->lock);
3892 goto end;
ffe60014 3893 }
d0b96690 3894 goto error_unlock;
421cb601 3895 }
5b4a0ec0 3896
55c3953d
DG
3897 /* Indicate that the session has been started once */
3898 ua_sess->started = 1;
3899
d0b96690
DG
3900 pthread_mutex_unlock(&ua_sess->lock);
3901
840cb59c 3902 health_code_update();
86acf0da 3903
421cb601 3904 /* Quiescent wait after starting trace */
ffe60014
DG
3905 ret = ustctl_wait_quiescent(app->sock);
3906 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
3907 ERR("UST app wait quiescent failed for app pid %d ret %d",
3908 app->pid, ret);
3909 }
48842b30 3910
e0c7ec2b
DG
3911end:
3912 rcu_read_unlock();
840cb59c 3913 health_code_update();
421cb601 3914 return 0;
48842b30 3915
d0b96690
DG
3916error_unlock:
3917 pthread_mutex_unlock(&ua_sess->lock);
509cbaf8 3918 rcu_read_unlock();
840cb59c 3919 health_code_update();
421cb601
DG
3920 return -1;
3921}
48842b30 3922
8be98f9a
MD
3923/*
3924 * Stop tracing for a specific UST session and app.
3925 */
b34cbebf 3926static
8be98f9a
MD
3927int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
3928{
3929 int ret = 0;
3930 struct ust_app_session *ua_sess;
7972aab2 3931 struct ust_registry_session *registry;
8be98f9a 3932
852d0037 3933 DBG("Stopping tracing for ust app pid %d", app->pid);
8be98f9a
MD
3934
3935 rcu_read_lock();
3936
e0c7ec2b 3937 if (!app->compatible) {
d88aee68 3938 goto end_no_session;
e0c7ec2b
DG
3939 }
3940
8be98f9a
MD
3941 ua_sess = lookup_session_by_app(usess, app);
3942 if (ua_sess == NULL) {
d88aee68 3943 goto end_no_session;
8be98f9a
MD
3944 }
3945
d88aee68
DG
3946 pthread_mutex_lock(&ua_sess->lock);
3947
9bc07046
DG
3948 /*
3949 * If started = 0, it means that stop trace has been called for a session
c45536e1
DG
3950 * that was never started. It's possible since we can have a fail start
3951 * from either the application manager thread or the command thread. Simply
3952 * indicate that this is a stop error.
9bc07046 3953 */
f9dfc3d9 3954 if (!ua_sess->started) {
c45536e1
DG
3955 goto error_rcu_unlock;
3956 }
7db205b5 3957
840cb59c 3958 health_code_update();
86acf0da 3959
9d6c7d3f 3960 /* This inhibits UST tracing */
852d0037 3961 ret = ustctl_stop_session(app->sock, ua_sess->handle);
9d6c7d3f 3962 if (ret < 0) {
ffe60014
DG
3963 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
3964 ERR("Error stopping tracing for app pid: %d (ret: %d)",
3965 app->pid, ret);
3966 } else {
3967 DBG("UST app stop session failed. Application is dead.");
3757b385
DG
3968 /*
3969 * This is normal behavior, an application can die during the
3970 * creation process. Don't report an error so the execution can
3971 * continue normally.
3972 */
3973 goto end_unlock;
ffe60014 3974 }
9d6c7d3f
DG
3975 goto error_rcu_unlock;
3976 }
3977
840cb59c 3978 health_code_update();
86acf0da 3979
9d6c7d3f 3980 /* Quiescent wait after stopping trace */
ffe60014
DG
3981 ret = ustctl_wait_quiescent(app->sock);
3982 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
3983 ERR("UST app wait quiescent failed for app pid %d ret %d",
3984 app->pid, ret);
3985 }
9d6c7d3f 3986
840cb59c 3987 health_code_update();
86acf0da 3988
b34cbebf
MD
3989 registry = get_session_registry(ua_sess);
3990 assert(registry);
1b532a60
DG
3991
3992 if (!registry->metadata_closed) {
3993 /* Push metadata for application before freeing the application. */
3994 (void) push_metadata(registry, ua_sess->consumer);
3995 }
b34cbebf 3996
3757b385 3997end_unlock:
b34cbebf
MD
3998 pthread_mutex_unlock(&ua_sess->lock);
3999end_no_session:
4000 rcu_read_unlock();
4001 health_code_update();
4002 return 0;
4003
4004error_rcu_unlock:
4005 pthread_mutex_unlock(&ua_sess->lock);
4006 rcu_read_unlock();
4007 health_code_update();
4008 return -1;
4009}
4010
4011/*
4012 * Flush buffers for a specific UST session and app.
4013 */
4014static
4015int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app)
4016{
4017 int ret = 0;
4018 struct lttng_ht_iter iter;
4019 struct ust_app_session *ua_sess;
4020 struct ust_app_channel *ua_chan;
4021
4022 DBG("Flushing buffers for ust app pid %d", app->pid);
4023
4024 rcu_read_lock();
4025
4026 if (!app->compatible) {
4027 goto end_no_session;
4028 }
4029
4030 ua_sess = lookup_session_by_app(usess, app);
4031 if (ua_sess == NULL) {
4032 goto end_no_session;
4033 }
4034
4035 pthread_mutex_lock(&ua_sess->lock);
4036
4037 health_code_update();
4038
9d6c7d3f 4039 /* Flushing buffers */
bec39940
DG
4040 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
4041 node.node) {
840cb59c 4042 health_code_update();
ffe60014 4043 assert(ua_chan->is_sent);
852d0037 4044 ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
8be98f9a 4045 if (ret < 0) {
ffe60014
DG
4046 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4047 ERR("UST app PID %d channel %s flush failed with ret %d",
4048 app->pid, ua_chan->name, ret);
4049 } else {
4050 DBG3("UST app failed to flush %s. Application is dead.",
4051 ua_chan->name);
3757b385
DG
4052 /*
4053 * This is normal behavior, an application can die during the
4054 * creation process. Don't report an error so the execution can
4055 * continue normally.
4056 */
ffe60014 4057 }
6d3686da
DG
4058 /* Continuing flushing all buffers */
4059 continue;
8be98f9a
MD
4060 }
4061 }
8be98f9a 4062
840cb59c 4063 health_code_update();
86acf0da 4064
d88aee68
DG
4065 pthread_mutex_unlock(&ua_sess->lock);
4066end_no_session:
7db205b5 4067 rcu_read_unlock();
840cb59c 4068 health_code_update();
8be98f9a 4069 return 0;
8be98f9a
MD
4070}
4071
84cd17c6
MD
4072/*
4073 * Destroy a specific UST session in apps.
4074 */
3353de95 4075static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
84cd17c6 4076{
ffe60014 4077 int ret;
84cd17c6 4078 struct ust_app_session *ua_sess;
bec39940 4079 struct lttng_ht_iter iter;
d9bf3ca4 4080 struct lttng_ht_node_u64 *node;
84cd17c6 4081
852d0037 4082 DBG("Destroy tracing for ust app pid %d", app->pid);
84cd17c6
MD
4083
4084 rcu_read_lock();
4085
e0c7ec2b
DG
4086 if (!app->compatible) {
4087 goto end;
4088 }
4089
84cd17c6 4090 __lookup_session_by_app(usess, app, &iter);
d9bf3ca4 4091 node = lttng_ht_iter_get_node_u64(&iter);
84cd17c6 4092 if (node == NULL) {
d42f20df
DG
4093 /* Session is being or is deleted. */
4094 goto end;
84cd17c6
MD
4095 }
4096 ua_sess = caa_container_of(node, struct ust_app_session, node);
c4a1715b 4097
840cb59c 4098 health_code_update();
d0b96690 4099 destroy_app_session(app, ua_sess);
84cd17c6 4100
840cb59c 4101 health_code_update();
7db205b5 4102
84cd17c6 4103 /* Quiescent wait after stopping trace */
ffe60014
DG
4104 ret = ustctl_wait_quiescent(app->sock);
4105 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4106 ERR("UST app wait quiescent failed for app pid %d ret %d",
4107 app->pid, ret);
4108 }
e0c7ec2b
DG
4109end:
4110 rcu_read_unlock();
840cb59c 4111 health_code_update();
84cd17c6 4112 return 0;
84cd17c6
MD
4113}
4114
5b4a0ec0
DG
4115/*
4116 * Start tracing for the UST session.
4117 */
421cb601
DG
4118int ust_app_start_trace_all(struct ltt_ust_session *usess)
4119{
4120 int ret = 0;
bec39940 4121 struct lttng_ht_iter iter;
421cb601 4122 struct ust_app *app;
48842b30 4123
421cb601
DG
4124 DBG("Starting all UST traces");
4125
4126 rcu_read_lock();
421cb601 4127
852d0037 4128 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
421cb601 4129 ret = ust_app_start_trace(usess, app);
48842b30 4130 if (ret < 0) {
5b4a0ec0
DG
4131 /* Continue to next apps even on error */
4132 continue;
48842b30 4133 }
48842b30 4134 }
5b4a0ec0 4135
48842b30
DG
4136 rcu_read_unlock();
4137
4138 return 0;
4139}
487cf67c 4140
8be98f9a
MD
4141/*
4142 * Start tracing for the UST session.
4143 */
4144int ust_app_stop_trace_all(struct ltt_ust_session *usess)
4145{
4146 int ret = 0;
bec39940 4147 struct lttng_ht_iter iter;
8be98f9a
MD
4148 struct ust_app *app;
4149
4150 DBG("Stopping all UST traces");
4151
4152 rcu_read_lock();
4153
b34cbebf
MD
4154 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4155 ret = ust_app_stop_trace(usess, app);
4156 if (ret < 0) {
4157 /* Continue to next apps even on error */
4158 continue;
4159 }
4160 }
4161
b0a5f0fb 4162 /* Flush buffers and push metadata (for UID buffers). */
b34cbebf
MD
4163 switch (usess->buffer_type) {
4164 case LTTNG_BUFFER_PER_UID:
4165 {
7972aab2 4166 struct buffer_reg_uid *reg;
b34cbebf
MD
4167
4168 /* Flush all per UID buffers associated to that session. */
7972aab2 4169 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
b0a5f0fb 4170 struct ust_registry_session *ust_session_reg;
7972aab2
DG
4171 struct buffer_reg_channel *reg_chan;
4172 struct consumer_socket *socket;
4173
4174 /* Get consumer socket to use to push the metadata.*/
4175 socket = consumer_find_socket_by_bitness(reg->bits_per_long,
4176 usess->consumer);
4177 if (!socket) {
4178 /* Ignore request if no consumer is found for the session. */
4179 continue;
4180 }
4181
4182 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
4183 reg_chan, node.node) {
4184 /*
4185 * The following call will print error values so the return
4186 * code is of little importance because whatever happens, we
4187 * have to try them all.
4188 */
4189 (void) consumer_flush_channel(socket, reg_chan->consumer_key);
4190 }
b0a5f0fb
MD
4191
4192 ust_session_reg = reg->registry->reg.ust;
4193 if (!ust_session_reg->metadata_closed) {
4194 /* Push metadata. */
4195 (void) push_metadata(ust_session_reg, usess->consumer);
4196 }
7972aab2 4197 }
b0a5f0fb 4198
b34cbebf 4199 break;
7972aab2 4200 }
b34cbebf
MD
4201 case LTTNG_BUFFER_PER_PID:
4202 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4203 ret = ust_app_flush_trace(usess, app);
4204 if (ret < 0) {
4205 /* Continue to next apps even on error */
4206 continue;
4207 }
8be98f9a 4208 }
b34cbebf
MD
4209 break;
4210 default:
4211 assert(0);
4212 break;
8be98f9a
MD
4213 }
4214
4215 rcu_read_unlock();
4216
4217 return 0;
4218}
4219
84cd17c6
MD
4220/*
4221 * Destroy app UST session.
4222 */
4223int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
4224{
4225 int ret = 0;
bec39940 4226 struct lttng_ht_iter iter;
84cd17c6
MD
4227 struct ust_app *app;
4228
4229 DBG("Destroy all UST traces");
4230
4231 rcu_read_lock();
4232
852d0037 4233 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
3353de95 4234 ret = destroy_trace(usess, app);
84cd17c6
MD
4235 if (ret < 0) {
4236 /* Continue to next apps even on error */
4237 continue;
4238 }
4239 }
4240
4241 rcu_read_unlock();
4242
4243 return 0;
4244}
4245
5b4a0ec0
DG
4246/*
4247 * Add channels/events from UST global domain to registered apps at sock.
4248 */
487cf67c
DG
4249void ust_app_global_update(struct ltt_ust_session *usess, int sock)
4250{
55c54cce 4251 int ret = 0;
31746f93 4252 struct lttng_ht_iter iter, uiter;
487cf67c 4253 struct ust_app *app;
3d8ca23b 4254 struct ust_app_session *ua_sess = NULL;
487cf67c
DG
4255 struct ust_app_channel *ua_chan;
4256 struct ust_app_event *ua_event;
727d5404 4257 struct ust_app_ctx *ua_ctx;
1f3580c7 4258
95e047ff 4259 assert(usess);
ffe60014 4260 assert(sock >= 0);
1f3580c7 4261
d9bf3ca4 4262 DBG2("UST app global update for app sock %d for session id %" PRIu64, sock,
a991f516 4263 usess->id);
487cf67c 4264
284d8f55
DG
4265 rcu_read_lock();
4266
f20baf8e 4267 app = ust_app_find_by_sock(sock);
487cf67c 4268 if (app == NULL) {
d88aee68
DG
4269 /*
4270 * Application can be unregistered before so this is possible hence
4271 * simply stopping the update.
4272 */
4273 DBG3("UST app update failed to find app sock %d", sock);
487cf67c
DG
4274 goto error;
4275 }
4276
e0c7ec2b
DG
4277 if (!app->compatible) {
4278 goto error;
4279 }
4280
3d8ca23b
DG
4281 ret = create_ust_app_session(usess, app, &ua_sess, NULL);
4282 if (ret < 0) {
4283 /* Tracer is probably gone or ENOMEM. */
487cf67c
DG
4284 goto error;
4285 }
3d8ca23b 4286 assert(ua_sess);
487cf67c 4287
d0b96690
DG
4288 pthread_mutex_lock(&ua_sess->lock);
4289
284d8f55 4290 /*
d0b96690 4291 * We can iterate safely here over all UST app session since the create ust
284d8f55
DG
4292 * app session above made a shadow copy of the UST global domain from the
4293 * ltt ust session.
4294 */
bec39940
DG
4295 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
4296 node.node) {
ad7a9107
DG
4297 ret = do_create_channel(app, usess, ua_sess, ua_chan);
4298 if (ret < 0) {
4299 /*
4300 * Stop everything. On error, the application failed, no more
4301 * file descriptor are available or ENOMEM so stopping here is
4302 * the only thing we can do for now.
4303 */
4304 goto error_unlock;
487cf67c
DG
4305 }
4306
31746f93
DG
4307 /*
4308 * Add context using the list so they are enabled in the same order the
4309 * user added them.
4310 */
4311 cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) {
727d5404
DG
4312 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
4313 if (ret < 0) {
d0b96690 4314 goto error_unlock;
727d5404
DG
4315 }
4316 }
4317
4318
284d8f55 4319 /* For each events */
bec39940
DG
4320 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
4321 node.node) {
284d8f55
DG
4322 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
4323 if (ret < 0) {
d0b96690 4324 goto error_unlock;
487cf67c 4325 }
36dc12cc 4326 }
487cf67c
DG
4327 }
4328
d0b96690
DG
4329 pthread_mutex_unlock(&ua_sess->lock);
4330
14fb1ebe 4331 if (usess->active) {
421cb601 4332 ret = ust_app_start_trace(usess, app);
36dc12cc 4333 if (ret < 0) {
36dc12cc
DG
4334 goto error;
4335 }
4336
852d0037 4337 DBG2("UST trace started for app pid %d", app->pid);
36dc12cc
DG
4338 }
4339
ffe60014
DG
4340 /* Everything went well at this point. */
4341 rcu_read_unlock();
4342 return;
4343
d0b96690
DG
4344error_unlock:
4345 pthread_mutex_unlock(&ua_sess->lock);
487cf67c 4346error:
ffe60014 4347 if (ua_sess) {
d0b96690 4348 destroy_app_session(app, ua_sess);
ffe60014 4349 }
487cf67c
DG
4350 rcu_read_unlock();
4351 return;
4352}
55cc08a6
DG
4353
4354/*
4355 * Add context to a specific channel for global UST domain.
4356 */
4357int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
4358 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
4359{
4360 int ret = 0;
bec39940
DG
4361 struct lttng_ht_node_str *ua_chan_node;
4362 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
4363 struct ust_app_channel *ua_chan = NULL;
4364 struct ust_app_session *ua_sess;
4365 struct ust_app *app;
4366
4367 rcu_read_lock();
4368
852d0037 4369 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
4370 if (!app->compatible) {
4371 /*
4372 * TODO: In time, we should notice the caller of this error by
4373 * telling him that this is a version error.
4374 */
4375 continue;
4376 }
55cc08a6
DG
4377 ua_sess = lookup_session_by_app(usess, app);
4378 if (ua_sess == NULL) {
4379 continue;
4380 }
4381
d0b96690 4382 pthread_mutex_lock(&ua_sess->lock);
55cc08a6 4383 /* Lookup channel in the ust app session */
bec39940
DG
4384 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
4385 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6 4386 if (ua_chan_node == NULL) {
d0b96690 4387 goto next_app;
55cc08a6
DG
4388 }
4389 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
4390 node);
55cc08a6
DG
4391 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
4392 if (ret < 0) {
d0b96690 4393 goto next_app;
55cc08a6 4394 }
d0b96690
DG
4395 next_app:
4396 pthread_mutex_unlock(&ua_sess->lock);
55cc08a6
DG
4397 }
4398
55cc08a6
DG
4399 rcu_read_unlock();
4400 return ret;
4401}
4402
76d45b40
DG
4403/*
4404 * Enable event for a channel from a UST session for a specific PID.
4405 */
4406int ust_app_enable_event_pid(struct ltt_ust_session *usess,
4407 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
4408{
4409 int ret = 0;
bec39940 4410 struct lttng_ht_iter iter;
18eace3b 4411 struct lttng_ht_node_str *ua_chan_node;
76d45b40
DG
4412 struct ust_app *app;
4413 struct ust_app_session *ua_sess;
4414 struct ust_app_channel *ua_chan;
4415 struct ust_app_event *ua_event;
4416
4417 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
4418
4419 rcu_read_lock();
4420
4421 app = ust_app_find_by_pid(pid);
4422 if (app == NULL) {
4423 ERR("UST app enable event per PID %d not found", pid);
4424 ret = -1;
d0b96690 4425 goto end;
76d45b40
DG
4426 }
4427
e0c7ec2b
DG
4428 if (!app->compatible) {
4429 ret = 0;
d0b96690 4430 goto end;
e0c7ec2b
DG
4431 }
4432
76d45b40 4433 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
4434 if (!ua_sess) {
4435 /* The application has problem or is probably dead. */
d0b96690
DG
4436 ret = 0;
4437 goto end;
c4a1715b 4438 }
76d45b40 4439
d0b96690 4440 pthread_mutex_lock(&ua_sess->lock);
76d45b40 4441 /* Lookup channel in the ust app session */
bec39940
DG
4442 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
4443 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
4444 /* If the channel is not found, there is a code flow error */
4445 assert(ua_chan_node);
4446
4447 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
4448
18eace3b 4449 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
39c5a3a7 4450 uevent->filter, uevent->attr.loglevel, uevent->exclusion);
18eace3b 4451 if (ua_event == NULL) {
76d45b40
DG
4452 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
4453 if (ret < 0) {
d0b96690 4454 goto end_unlock;
76d45b40
DG
4455 }
4456 } else {
76d45b40
DG
4457 ret = enable_ust_app_event(ua_sess, ua_event, app);
4458 if (ret < 0) {
d0b96690 4459 goto end_unlock;
76d45b40
DG
4460 }
4461 }
4462
d0b96690
DG
4463end_unlock:
4464 pthread_mutex_unlock(&ua_sess->lock);
4465end:
76d45b40
DG
4466 rcu_read_unlock();
4467 return ret;
4468}
7f79d3a1 4469
4466912f
DG
4470/*
4471 * Calibrate registered applications.
4472 */
4473int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
4474{
4475 int ret = 0;
4476 struct lttng_ht_iter iter;
4477 struct ust_app *app;
4478
4479 rcu_read_lock();
4480
852d0037 4481 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4466912f
DG
4482 if (!app->compatible) {
4483 /*
4484 * TODO: In time, we should notice the caller of this error by
4485 * telling him that this is a version error.
4486 */
4487 continue;
4488 }
4489
840cb59c 4490 health_code_update();
86acf0da 4491
852d0037 4492 ret = ustctl_calibrate(app->sock, calibrate);
4466912f
DG
4493 if (ret < 0) {
4494 switch (ret) {
4495 case -ENOSYS:
4496 /* Means that it's not implemented on the tracer side. */
4497 ret = 0;
4498 break;
4499 default:
4466912f 4500 DBG2("Calibrate app PID %d returned with error %d",
852d0037 4501 app->pid, ret);
4466912f
DG
4502 break;
4503 }
4504 }
4505 }
4506
4507 DBG("UST app global domain calibration finished");
4508
4509 rcu_read_unlock();
4510
840cb59c 4511 health_code_update();
86acf0da 4512
4466912f
DG
4513 return ret;
4514}
d0b96690
DG
4515
4516/*
4517 * Receive registration and populate the given msg structure.
4518 *
4519 * On success return 0 else a negative value returned by the ustctl call.
4520 */
4521int ust_app_recv_registration(int sock, struct ust_register_msg *msg)
4522{
4523 int ret;
4524 uint32_t pid, ppid, uid, gid;
4525
4526 assert(msg);
4527
4528 ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor,
4529 &pid, &ppid, &uid, &gid,
4530 &msg->bits_per_long,
4531 &msg->uint8_t_alignment,
4532 &msg->uint16_t_alignment,
4533 &msg->uint32_t_alignment,
4534 &msg->uint64_t_alignment,
4535 &msg->long_alignment,
4536 &msg->byte_order,
4537 msg->name);
4538 if (ret < 0) {
4539 switch (-ret) {
4540 case EPIPE:
4541 case ECONNRESET:
4542 case LTTNG_UST_ERR_EXITING:
4543 DBG3("UST app recv reg message failed. Application died");
4544 break;
4545 case LTTNG_UST_ERR_UNSUP_MAJOR:
4546 ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d",
4547 msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION,
4548 LTTNG_UST_ABI_MINOR_VERSION);
4549 break;
4550 default:
4551 ERR("UST app recv reg message failed with ret %d", ret);
4552 break;
4553 }
4554 goto error;
4555 }
4556 msg->pid = (pid_t) pid;
4557 msg->ppid = (pid_t) ppid;
4558 msg->uid = (uid_t) uid;
4559 msg->gid = (gid_t) gid;
4560
4561error:
4562 return ret;
4563}
4564
d88aee68
DG
4565/*
4566 * Return a ust app channel object using the application object and the channel
4567 * object descriptor has a key. If not found, NULL is returned. A RCU read side
4568 * lock MUST be acquired before calling this function.
4569 */
d0b96690
DG
4570static struct ust_app_channel *find_channel_by_objd(struct ust_app *app,
4571 int objd)
4572{
4573 struct lttng_ht_node_ulong *node;
4574 struct lttng_ht_iter iter;
4575 struct ust_app_channel *ua_chan = NULL;
4576
4577 assert(app);
4578
4579 lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter);
4580 node = lttng_ht_iter_get_node_ulong(&iter);
4581 if (node == NULL) {
4582 DBG2("UST app channel find by objd %d not found", objd);
4583 goto error;
4584 }
4585
4586 ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node);
4587
4588error:
4589 return ua_chan;
4590}
4591
d88aee68
DG
4592/*
4593 * Reply to a register channel notification from an application on the notify
4594 * socket. The channel metadata is also created.
4595 *
4596 * The session UST registry lock is acquired in this function.
4597 *
4598 * On success 0 is returned else a negative value.
4599 */
d0b96690
DG
4600static int reply_ust_register_channel(int sock, int sobjd, int cobjd,
4601 size_t nr_fields, struct ustctl_field *fields)
4602{
4603 int ret, ret_code = 0;
4604 uint32_t chan_id, reg_count;
7972aab2 4605 uint64_t chan_reg_key;
d0b96690
DG
4606 enum ustctl_channel_header type;
4607 struct ust_app *app;
4608 struct ust_app_channel *ua_chan;
4609 struct ust_app_session *ua_sess;
7972aab2 4610 struct ust_registry_session *registry;
45893984 4611 struct ust_registry_channel *chan_reg;
d0b96690
DG
4612
4613 rcu_read_lock();
4614
4615 /* Lookup application. If not found, there is a code flow error. */
4616 app = find_app_by_notify_sock(sock);
d88aee68
DG
4617 if (!app) {
4618 DBG("Application socket %d is being teardown. Abort event notify",
4619 sock);
4620 ret = 0;
d5d629b5 4621 free(fields);
d88aee68
DG
4622 goto error_rcu_unlock;
4623 }
d0b96690 4624
4950b860 4625 /* Lookup channel by UST object descriptor. */
d0b96690 4626 ua_chan = find_channel_by_objd(app, cobjd);
4950b860
MD
4627 if (!ua_chan) {
4628 DBG("Application channel is being teardown. Abort event notify");
4629 ret = 0;
d5d629b5 4630 free(fields);
4950b860
MD
4631 goto error_rcu_unlock;
4632 }
4633
d0b96690
DG
4634 assert(ua_chan->session);
4635 ua_sess = ua_chan->session;
d0b96690 4636
7972aab2
DG
4637 /* Get right session registry depending on the session buffer type. */
4638 registry = get_session_registry(ua_sess);
4639 assert(registry);
45893984 4640
7972aab2
DG
4641 /* Depending on the buffer type, a different channel key is used. */
4642 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) {
4643 chan_reg_key = ua_chan->tracing_channel_id;
d0b96690 4644 } else {
7972aab2 4645 chan_reg_key = ua_chan->key;
d0b96690
DG
4646 }
4647
7972aab2
DG
4648 pthread_mutex_lock(&registry->lock);
4649
4650 chan_reg = ust_registry_channel_find(registry, chan_reg_key);
4651 assert(chan_reg);
4652
4653 if (!chan_reg->register_done) {
4654 reg_count = ust_registry_get_event_count(chan_reg);
4655 if (reg_count < 31) {
4656 type = USTCTL_CHANNEL_HEADER_COMPACT;
4657 } else {
4658 type = USTCTL_CHANNEL_HEADER_LARGE;
4659 }
4660
4661 chan_reg->nr_ctx_fields = nr_fields;
4662 chan_reg->ctx_fields = fields;
4663 chan_reg->header_type = type;
d0b96690 4664 } else {
7972aab2
DG
4665 /* Get current already assigned values. */
4666 type = chan_reg->header_type;
d5d629b5
DG
4667 free(fields);
4668 /* Set to NULL so the error path does not do a double free. */
4669 fields = NULL;
d0b96690 4670 }
7972aab2
DG
4671 /* Channel id is set during the object creation. */
4672 chan_id = chan_reg->chan_id;
d0b96690
DG
4673
4674 /* Append to metadata */
7972aab2
DG
4675 if (!chan_reg->metadata_dumped) {
4676 ret_code = ust_metadata_channel_statedump(registry, chan_reg);
d0b96690
DG
4677 if (ret_code) {
4678 ERR("Error appending channel metadata (errno = %d)", ret_code);
4679 goto reply;
4680 }
4681 }
4682
4683reply:
7972aab2
DG
4684 DBG3("UST app replying to register channel key %" PRIu64
4685 " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type,
4686 ret_code);
d0b96690
DG
4687
4688 ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code);
4689 if (ret < 0) {
4690 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4691 ERR("UST app reply channel failed with ret %d", ret);
4692 } else {
4693 DBG3("UST app reply channel failed. Application died");
4694 }
4695 goto error;
4696 }
4697
7972aab2
DG
4698 /* This channel registry registration is completed. */
4699 chan_reg->register_done = 1;
4700
d0b96690 4701error:
7972aab2 4702 pthread_mutex_unlock(&registry->lock);
d88aee68 4703error_rcu_unlock:
d0b96690 4704 rcu_read_unlock();
d5d629b5
DG
4705 if (ret) {
4706 free(fields);
4707 }
d0b96690
DG
4708 return ret;
4709}
4710
d88aee68
DG
4711/*
4712 * Add event to the UST channel registry. When the event is added to the
4713 * registry, the metadata is also created. Once done, this replies to the
4714 * application with the appropriate error code.
4715 *
4716 * The session UST registry lock is acquired in the function.
4717 *
4718 * On success 0 is returned else a negative value.
4719 */
d0b96690
DG
4720static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name,
4721 char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel,
4722 char *model_emf_uri)
4723{
4724 int ret, ret_code;
4725 uint32_t event_id = 0;
7972aab2 4726 uint64_t chan_reg_key;
d0b96690
DG
4727 struct ust_app *app;
4728 struct ust_app_channel *ua_chan;
4729 struct ust_app_session *ua_sess;
7972aab2 4730 struct ust_registry_session *registry;
d0b96690
DG
4731
4732 rcu_read_lock();
4733
4734 /* Lookup application. If not found, there is a code flow error. */
4735 app = find_app_by_notify_sock(sock);
d88aee68
DG
4736 if (!app) {
4737 DBG("Application socket %d is being teardown. Abort event notify",
4738 sock);
4739 ret = 0;
d5d629b5
DG
4740 free(sig);
4741 free(fields);
4742 free(model_emf_uri);
d88aee68
DG
4743 goto error_rcu_unlock;
4744 }
d0b96690 4745
4950b860 4746 /* Lookup channel by UST object descriptor. */
d0b96690 4747 ua_chan = find_channel_by_objd(app, cobjd);
4950b860
MD
4748 if (!ua_chan) {
4749 DBG("Application channel is being teardown. Abort event notify");
4750 ret = 0;
d5d629b5
DG
4751 free(sig);
4752 free(fields);
4753 free(model_emf_uri);
4950b860
MD
4754 goto error_rcu_unlock;
4755 }
4756
d0b96690
DG
4757 assert(ua_chan->session);
4758 ua_sess = ua_chan->session;
4759
7972aab2
DG
4760 registry = get_session_registry(ua_sess);
4761 assert(registry);
4762
4763 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) {
4764 chan_reg_key = ua_chan->tracing_channel_id;
4765 } else {
4766 chan_reg_key = ua_chan->key;
4767 }
4768
4769 pthread_mutex_lock(&registry->lock);
d0b96690 4770
d5d629b5
DG
4771 /*
4772 * From this point on, this call acquires the ownership of the sig, fields
4773 * and model_emf_uri meaning any free are done inside it if needed. These
4774 * three variables MUST NOT be read/write after this.
4775 */
7972aab2 4776 ret_code = ust_registry_create_event(registry, chan_reg_key,
45893984 4777 sobjd, cobjd, name, sig, nr_fields, fields, loglevel,
8494bda5
MD
4778 model_emf_uri, ua_sess->buffer_type, &event_id,
4779 app);
d0b96690
DG
4780
4781 /*
4782 * The return value is returned to ustctl so in case of an error, the
4783 * application can be notified. In case of an error, it's important not to
4784 * return a negative error or else the application will get closed.
4785 */
4786 ret = ustctl_reply_register_event(sock, event_id, ret_code);
4787 if (ret < 0) {
4788 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4789 ERR("UST app reply event failed with ret %d", ret);
4790 } else {
4791 DBG3("UST app reply event failed. Application died");
4792 }
4793 /*
4794 * No need to wipe the create event since the application socket will
4795 * get close on error hence cleaning up everything by itself.
4796 */
4797 goto error;
4798 }
4799
7972aab2
DG
4800 DBG3("UST registry event %s with id %" PRId32 " added successfully",
4801 name, event_id);
d88aee68 4802
d0b96690 4803error:
7972aab2 4804 pthread_mutex_unlock(&registry->lock);
d88aee68 4805error_rcu_unlock:
d0b96690
DG
4806 rcu_read_unlock();
4807 return ret;
4808}
4809
d88aee68
DG
4810/*
4811 * Handle application notification through the given notify socket.
4812 *
4813 * Return 0 on success or else a negative value.
4814 */
d0b96690
DG
4815int ust_app_recv_notify(int sock)
4816{
4817 int ret;
4818 enum ustctl_notify_cmd cmd;
4819
4820 DBG3("UST app receiving notify from sock %d", sock);
4821
4822 ret = ustctl_recv_notify(sock, &cmd);
4823 if (ret < 0) {
4824 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4825 ERR("UST app recv notify failed with ret %d", ret);
4826 } else {
4827 DBG3("UST app recv notify failed. Application died");
4828 }
4829 goto error;
4830 }
4831
4832 switch (cmd) {
4833 case USTCTL_NOTIFY_CMD_EVENT:
4834 {
4835 int sobjd, cobjd, loglevel;
4836 char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri;
4837 size_t nr_fields;
4838 struct ustctl_field *fields;
4839
4840 DBG2("UST app ustctl register event received");
4841
4842 ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel,
4843 &sig, &nr_fields, &fields, &model_emf_uri);
4844 if (ret < 0) {
4845 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4846 ERR("UST app recv event failed with ret %d", ret);
4847 } else {
4848 DBG3("UST app recv event failed. Application died");
4849 }
4850 goto error;
4851 }
4852
d5d629b5
DG
4853 /*
4854 * Add event to the UST registry coming from the notify socket. This
4855 * call will free if needed the sig, fields and model_emf_uri. This
4856 * code path loses the ownsership of these variables and transfer them
4857 * to the this function.
4858 */
d0b96690
DG
4859 ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields,
4860 fields, loglevel, model_emf_uri);
4861 if (ret < 0) {
4862 goto error;
4863 }
4864
4865 break;
4866 }
4867 case USTCTL_NOTIFY_CMD_CHANNEL:
4868 {
4869 int sobjd, cobjd;
4870 size_t nr_fields;
4871 struct ustctl_field *fields;
4872
4873 DBG2("UST app ustctl register channel received");
4874
4875 ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields,
4876 &fields);
4877 if (ret < 0) {
4878 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4879 ERR("UST app recv channel failed with ret %d", ret);
4880 } else {
4881 DBG3("UST app recv channel failed. Application died");
4882 }
4883 goto error;
4884 }
4885
d5d629b5
DG
4886 /*
4887 * The fields ownership are transfered to this function call meaning
4888 * that if needed it will be freed. After this, it's invalid to access
4889 * fields or clean it up.
4890 */
d0b96690
DG
4891 ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields,
4892 fields);
4893 if (ret < 0) {
4894 goto error;
4895 }
4896
4897 break;
4898 }
4899 default:
4900 /* Should NEVER happen. */
4901 assert(0);
4902 }
4903
4904error:
4905 return ret;
4906}
d88aee68
DG
4907
4908/*
4909 * Once the notify socket hangs up, this is called. First, it tries to find the
4910 * corresponding application. On failure, the call_rcu to close the socket is
4911 * executed. If an application is found, it tries to delete it from the notify
4912 * socket hash table. Whathever the result, it proceeds to the call_rcu.
4913 *
4914 * Note that an object needs to be allocated here so on ENOMEM failure, the
4915 * call RCU is not done but the rest of the cleanup is.
4916 */
4917void ust_app_notify_sock_unregister(int sock)
4918{
4919 int err_enomem = 0;
4920 struct lttng_ht_iter iter;
4921 struct ust_app *app;
4922 struct ust_app_notify_sock_obj *obj;
4923
4924 assert(sock >= 0);
4925
4926 rcu_read_lock();
4927
4928 obj = zmalloc(sizeof(*obj));
4929 if (!obj) {
4930 /*
4931 * An ENOMEM is kind of uncool. If this strikes we continue the
4932 * procedure but the call_rcu will not be called. In this case, we
4933 * accept the fd leak rather than possibly creating an unsynchronized
4934 * state between threads.
4935 *
4936 * TODO: The notify object should be created once the notify socket is
4937 * registered and stored independantely from the ust app object. The
4938 * tricky part is to synchronize the teardown of the application and
4939 * this notify object. Let's keep that in mind so we can avoid this
4940 * kind of shenanigans with ENOMEM in the teardown path.
4941 */
4942 err_enomem = 1;
4943 } else {
4944 obj->fd = sock;
4945 }
4946
4947 DBG("UST app notify socket unregister %d", sock);
4948
4949 /*
4950 * Lookup application by notify socket. If this fails, this means that the
4951 * hash table delete has already been done by the application
4952 * unregistration process so we can safely close the notify socket in a
4953 * call RCU.
4954 */
4955 app = find_app_by_notify_sock(sock);
4956 if (!app) {
4957 goto close_socket;
4958 }
4959
4960 iter.iter.node = &app->notify_sock_n.node;
4961
4962 /*
4963 * Whatever happens here either we fail or succeed, in both cases we have
4964 * to close the socket after a grace period to continue to the call RCU
4965 * here. If the deletion is successful, the application is not visible
4966 * anymore by other threads and is it fails it means that it was already
4967 * deleted from the hash table so either way we just have to close the
4968 * socket.
4969 */
4970 (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
4971
4972close_socket:
4973 rcu_read_unlock();
4974
4975 /*
4976 * Close socket after a grace period to avoid for the socket to be reused
4977 * before the application object is freed creating potential race between
4978 * threads trying to add unique in the global hash table.
4979 */
4980 if (!err_enomem) {
4981 call_rcu(&obj->head, close_notify_sock_rcu);
4982 }
4983}
f45e313d
DG
4984
4985/*
4986 * Destroy a ust app data structure and free its memory.
4987 */
4988void ust_app_destroy(struct ust_app *app)
4989{
4990 if (!app) {
4991 return;
4992 }
4993
4994 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
4995}
6dc3064a
DG
4996
4997/*
4998 * Take a snapshot for a given UST session. The snapshot is sent to the given
4999 * output.
5000 *
5001 * Return 0 on success or else a negative value.
5002 */
5003int ust_app_snapshot_record(struct ltt_ust_session *usess,
68808f4e 5004 struct snapshot_output *output, int wait, uint64_t max_stream_size)
6dc3064a
DG
5005{
5006 int ret = 0;
7badf927 5007 unsigned int snapshot_done = 0;
6dc3064a
DG
5008 struct lttng_ht_iter iter;
5009 struct ust_app *app;
af706bb7 5010 char pathname[PATH_MAX];
6dc3064a
DG
5011
5012 assert(usess);
5013 assert(output);
5014
5015 rcu_read_lock();
5016
8c924c7b
MD
5017 switch (usess->buffer_type) {
5018 case LTTNG_BUFFER_PER_UID:
5019 {
5020 struct buffer_reg_uid *reg;
6dc3064a 5021
8c924c7b
MD
5022 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
5023 struct buffer_reg_channel *reg_chan;
5024 struct consumer_socket *socket;
6dc3064a 5025
8c924c7b
MD
5026 /* Get consumer socket to use to push the metadata.*/
5027 socket = consumer_find_socket_by_bitness(reg->bits_per_long,
5028 usess->consumer);
5029 if (!socket) {
5030 ret = -EINVAL;
5031 goto error;
5032 }
6dc3064a 5033
8c924c7b
MD
5034 memset(pathname, 0, sizeof(pathname));
5035 ret = snprintf(pathname, sizeof(pathname),
5036 DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH,
5037 reg->uid, reg->bits_per_long);
5038 if (ret < 0) {
5039 PERROR("snprintf snapshot path");
5040 goto error;
5041 }
5042
5043 /* Add the UST default trace dir to path. */
5044 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
5045 reg_chan, node.node) {
68808f4e
DG
5046 ret = consumer_snapshot_channel(socket, reg_chan->consumer_key,
5047 output, 0, usess->uid, usess->gid, pathname, wait,
8c924c7b
MD
5048 max_stream_size);
5049 if (ret < 0) {
5050 goto error;
5051 }
5052 }
68808f4e
DG
5053 ret = consumer_snapshot_channel(socket,
5054 reg->registry->reg.ust->metadata_key, output, 1,
5055 usess->uid, usess->gid, pathname, wait, max_stream_size);
8c924c7b
MD
5056 if (ret < 0) {
5057 goto error;
5058 }
7badf927 5059 snapshot_done = 1;
af706bb7 5060 }
8c924c7b
MD
5061 break;
5062 }
5063 case LTTNG_BUFFER_PER_PID:
5064 {
5065 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
5066 struct consumer_socket *socket;
5067 struct lttng_ht_iter chan_iter;
5068 struct ust_app_channel *ua_chan;
5069 struct ust_app_session *ua_sess;
5070 struct ust_registry_session *registry;
5071
5072 ua_sess = lookup_session_by_app(usess, app);
5073 if (!ua_sess) {
5074 /* Session not associated with this app. */
5075 continue;
5076 }
af706bb7 5077
8c924c7b
MD
5078 /* Get the right consumer socket for the application. */
5079 socket = consumer_find_socket_by_bitness(app->bits_per_long,
5080 output->consumer);
5081 if (!socket) {
5c786ded 5082 ret = -EINVAL;
5c786ded
JD
5083 goto error;
5084 }
5085
8c924c7b
MD
5086 /* Add the UST default trace dir to path. */
5087 memset(pathname, 0, sizeof(pathname));
5088 ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s",
5089 ua_sess->path);
6dc3064a 5090 if (ret < 0) {
8c924c7b 5091 PERROR("snprintf snapshot path");
6dc3064a
DG
5092 goto error;
5093 }
6dc3064a 5094
8c924c7b
MD
5095 cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
5096 ua_chan, node.node) {
68808f4e
DG
5097 ret = consumer_snapshot_channel(socket, ua_chan->key, output,
5098 0, ua_sess->euid, ua_sess->egid, pathname, wait,
8c924c7b
MD
5099 max_stream_size);
5100 if (ret < 0) {
5101 goto error;
5102 }
5103 }
5104
5105 registry = get_session_registry(ua_sess);
5106 assert(registry);
5107 ret = consumer_snapshot_channel(socket, registry->metadata_key, output,
5108 1, ua_sess->euid, ua_sess->egid, pathname, wait,
5109 max_stream_size);
5110 if (ret < 0) {
5111 goto error;
5112 }
7badf927 5113 snapshot_done = 1;
8c924c7b
MD
5114 }
5115 break;
5116 }
5117 default:
5118 assert(0);
5119 break;
6dc3064a
DG
5120 }
5121
7badf927
DG
5122 if (!snapshot_done) {
5123 /*
5124 * If no snapshot was made and we are not in the error path, this means
5125 * that there are no buffers thus no (prior) application to snapshot
5126 * data from so we have simply NO data.
5127 */
5128 ret = -ENODATA;
5129 }
5130
6dc3064a
DG
5131error:
5132 rcu_read_unlock();
5133 return ret;
5134}
5c786ded
JD
5135
5136/*
5137 * Return the number of streams for a UST session.
5138 */
5139unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess)
5140{
5141 unsigned int ret = 0;
5142 struct ust_app *app;
5143 struct lttng_ht_iter iter;
5144
5145 assert(usess);
5146
5147 switch (usess->buffer_type) {
5148 case LTTNG_BUFFER_PER_UID:
5149 {
5150 struct buffer_reg_uid *reg;
5151
5152 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
5153 struct buffer_reg_channel *reg_chan;
5154
b7064eaa 5155 rcu_read_lock();
5c786ded
JD
5156 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
5157 reg_chan, node.node) {
5158 ret += reg_chan->stream_count;
5159 }
b7064eaa 5160 rcu_read_unlock();
5c786ded
JD
5161 }
5162 break;
5163 }
5164 case LTTNG_BUFFER_PER_PID:
5165 {
5166 rcu_read_lock();
5167 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
5168 struct ust_app_channel *ua_chan;
5169 struct ust_app_session *ua_sess;
5170 struct lttng_ht_iter chan_iter;
5171
5172 ua_sess = lookup_session_by_app(usess, app);
5173 if (!ua_sess) {
5174 /* Session not associated with this app. */
5175 continue;
5176 }
5177
5178 cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
5179 ua_chan, node.node) {
5180 ret += ua_chan->streams.count;
5181 }
5182 }
5183 rcu_read_unlock();
5184 break;
5185 }
5186 default:
5187 assert(0);
5188 break;
5189 }
5190
5191 return ret;
5192}
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