Update maintainer section of the man pages
[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.c
CommitLineData
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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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.
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7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
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AM
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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16 */
17
18#define _GNU_SOURCE
19#include <errno.h>
7972aab2 20#include <inttypes.h>
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21#include <pthread.h>
22#include <stdio.h>
23#include <stdlib.h>
099e26bd 24#include <string.h>
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25#include <sys/stat.h>
26#include <sys/types.h>
099e26bd 27#include <unistd.h>
0df502fd 28#include <urcu/compiler.h>
fb54cdbf 29#include <lttng/ust-error.h>
331744e3 30#include <signal.h>
bec39940 31
990570ed 32#include <common/common.h>
86acf0da 33#include <common/sessiond-comm/sessiond-comm.h>
1e307fab 34
7972aab2 35#include "buffer-registry.h"
86acf0da 36#include "fd-limit.h"
8782cc74 37#include "health-sessiond.h"
56fff090 38#include "ust-app.h"
48842b30 39#include "ust-consumer.h"
d80a6244 40#include "ust-ctl.h"
0b2dc8df 41#include "utils.h"
d80a6244 42
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43/* Next available channel key. Access under next_channel_key_lock. */
44static uint64_t _next_channel_key;
45static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER;
46
47/* Next available session ID. Access under next_session_id_lock. */
48static uint64_t _next_session_id;
49static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER;
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50
51/*
d9bf3ca4 52 * Return the incremented value of next_channel_key.
ffe60014 53 */
d9bf3ca4 54static uint64_t get_next_channel_key(void)
ffe60014 55{
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MD
56 uint64_t ret;
57
58 pthread_mutex_lock(&next_channel_key_lock);
59 ret = ++_next_channel_key;
60 pthread_mutex_unlock(&next_channel_key_lock);
61 return ret;
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62}
63
64/*
7972aab2 65 * Return the atomically incremented value of next_session_id.
ffe60014 66 */
d9bf3ca4 67static uint64_t get_next_session_id(void)
ffe60014 68{
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MD
69 uint64_t ret;
70
71 pthread_mutex_lock(&next_session_id_lock);
72 ret = ++_next_session_id;
73 pthread_mutex_unlock(&next_session_id_lock);
74 return ret;
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75}
76
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77static void copy_channel_attr_to_ustctl(
78 struct ustctl_consumer_channel_attr *attr,
79 struct lttng_ust_channel_attr *uattr)
80{
81 /* Copy event attributes since the layout is different. */
82 attr->subbuf_size = uattr->subbuf_size;
83 attr->num_subbuf = uattr->num_subbuf;
84 attr->overwrite = uattr->overwrite;
85 attr->switch_timer_interval = uattr->switch_timer_interval;
86 attr->read_timer_interval = uattr->read_timer_interval;
87 attr->output = uattr->output;
88}
89
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90/*
91 * Match function for the hash table lookup.
92 *
93 * It matches an ust app event based on three attributes which are the event
94 * name, the filter bytecode and the loglevel.
95 */
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96static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key)
97{
98 struct ust_app_event *event;
99 const struct ust_app_ht_key *key;
100
101 assert(node);
102 assert(_key);
103
104 event = caa_container_of(node, struct ust_app_event, node.node);
105 key = _key;
106
1af53eb5 107 /* Match the 4 elements of the key: name, filter, loglevel, exclusions */
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108
109 /* Event name */
110 if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
111 goto no_match;
112 }
113
114 /* Event loglevel. */
115 if (event->attr.loglevel != key->loglevel) {
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116 if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL
117 && key->loglevel == 0 && event->attr.loglevel == -1) {
118 /*
119 * Match is accepted. This is because on event creation, the
120 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
121 * -1 are accepted for this loglevel type since 0 is the one set by
122 * the API when receiving an enable event.
123 */
124 } else {
125 goto no_match;
126 }
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127 }
128
129 /* One of the filters is NULL, fail. */
130 if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
131 goto no_match;
132 }
133
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134 if (key->filter && event->filter) {
135 /* Both filters exists, check length followed by the bytecode. */
136 if (event->filter->len != key->filter->len ||
137 memcmp(event->filter->data, key->filter->data,
138 event->filter->len) != 0) {
139 goto no_match;
140 }
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DG
141 }
142
1af53eb5
JI
143 /* One of the exclusions is NULL, fail. */
144 if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) {
145 goto no_match;
146 }
147
148 if (key->exclusion && event->exclusion) {
149 /* Both exclusions exists, check count followed by the names. */
150 if (event->exclusion->count != key->exclusion->count ||
151 memcmp(event->exclusion->names, key->exclusion->names,
152 event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) {
153 goto no_match;
154 }
155 }
156
157
025faf73 158 /* Match. */
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159 return 1;
160
161no_match:
162 return 0;
18eace3b
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163}
164
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165/*
166 * Unique add of an ust app event in the given ht. This uses the custom
167 * ht_match_ust_app_event match function and the event name as hash.
168 */
d0b96690 169static void add_unique_ust_app_event(struct ust_app_channel *ua_chan,
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170 struct ust_app_event *event)
171{
172 struct cds_lfht_node *node_ptr;
173 struct ust_app_ht_key key;
d0b96690 174 struct lttng_ht *ht;
18eace3b 175
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176 assert(ua_chan);
177 assert(ua_chan->events);
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178 assert(event);
179
d0b96690 180 ht = ua_chan->events;
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181 key.name = event->attr.name;
182 key.filter = event->filter;
183 key.loglevel = event->attr.loglevel;
91c89f23 184 key.exclusion = event->exclusion;
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185
186 node_ptr = cds_lfht_add_unique(ht->ht,
187 ht->hash_fct(event->node.key, lttng_ht_seed),
188 ht_match_ust_app_event, &key, &event->node.node);
189 assert(node_ptr == &event->node.node);
190}
191
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192/*
193 * Close the notify socket from the given RCU head object. This MUST be called
194 * through a call_rcu().
195 */
196static void close_notify_sock_rcu(struct rcu_head *head)
197{
198 int ret;
199 struct ust_app_notify_sock_obj *obj =
200 caa_container_of(head, struct ust_app_notify_sock_obj, head);
201
202 /* Must have a valid fd here. */
203 assert(obj->fd >= 0);
204
205 ret = close(obj->fd);
206 if (ret) {
207 ERR("close notify sock %d RCU", obj->fd);
208 }
209 lttng_fd_put(LTTNG_FD_APPS, 1);
210
211 free(obj);
212}
213
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214/*
215 * Return the session registry according to the buffer type of the given
216 * session.
217 *
218 * A registry per UID object MUST exists before calling this function or else
219 * it assert() if not found. RCU read side lock must be acquired.
220 */
221static struct ust_registry_session *get_session_registry(
222 struct ust_app_session *ua_sess)
223{
224 struct ust_registry_session *registry = NULL;
225
226 assert(ua_sess);
227
228 switch (ua_sess->buffer_type) {
229 case LTTNG_BUFFER_PER_PID:
230 {
231 struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id);
232 if (!reg_pid) {
233 goto error;
234 }
235 registry = reg_pid->registry->reg.ust;
236 break;
237 }
238 case LTTNG_BUFFER_PER_UID:
239 {
240 struct buffer_reg_uid *reg_uid = buffer_reg_uid_find(
241 ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid);
242 if (!reg_uid) {
243 goto error;
244 }
245 registry = reg_uid->registry->reg.ust;
246 break;
247 }
248 default:
249 assert(0);
250 };
251
252error:
253 return registry;
254}
255
55cc08a6
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256/*
257 * Delete ust context safely. RCU read lock must be held before calling
258 * this function.
259 */
260static
261void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
262{
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263 int ret;
264
265 assert(ua_ctx);
266
55cc08a6 267 if (ua_ctx->obj) {
ffe60014 268 ret = ustctl_release_object(sock, ua_ctx->obj);
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269 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
270 ERR("UST app sock %d release ctx obj handle %d failed with ret %d",
271 sock, ua_ctx->obj->handle, ret);
ffe60014 272 }
55cc08a6
DG
273 free(ua_ctx->obj);
274 }
275 free(ua_ctx);
276}
277
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278/*
279 * Delete ust app event safely. RCU read lock must be held before calling
280 * this function.
281 */
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282static
283void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
d80a6244 284{
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285 int ret;
286
287 assert(ua_event);
288
53a80697 289 free(ua_event->filter);
951f0b71
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290 if (ua_event->exclusion != NULL)
291 free(ua_event->exclusion);
edb67388 292 if (ua_event->obj != NULL) {
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293 ret = ustctl_release_object(sock, ua_event->obj);
294 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
295 ERR("UST app sock %d release event obj failed with ret %d",
296 sock, ret);
297 }
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298 free(ua_event->obj);
299 }
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300 free(ua_event);
301}
302
303/*
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304 * Release ust data object of the given stream.
305 *
306 * Return 0 on success or else a negative value.
d80a6244 307 */
7972aab2 308static int release_ust_app_stream(int sock, struct ust_app_stream *stream)
d80a6244 309{
7972aab2 310 int ret = 0;
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311
312 assert(stream);
313
8b366481 314 if (stream->obj) {
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315 ret = ustctl_release_object(sock, stream->obj);
316 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
317 ERR("UST app sock %d release stream obj failed with ret %d",
318 sock, ret);
319 }
4063050c 320 lttng_fd_put(LTTNG_FD_APPS, 2);
8b366481
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321 free(stream->obj);
322 }
7972aab2
DG
323
324 return ret;
325}
326
327/*
328 * Delete ust app stream safely. RCU read lock must be held before calling
329 * this function.
330 */
331static
332void delete_ust_app_stream(int sock, struct ust_app_stream *stream)
333{
334 assert(stream);
335
336 (void) release_ust_app_stream(sock, stream);
84cd17c6 337 free(stream);
d80a6244
DG
338}
339
36b588ed
MD
340/*
341 * We need to execute ht_destroy outside of RCU read-side critical
0b2dc8df
MD
342 * section and outside of call_rcu thread, so we postpone its execution
343 * using ht_cleanup_push. It is simpler than to change the semantic of
344 * the many callers of delete_ust_app_session().
36b588ed
MD
345 */
346static
347void delete_ust_app_channel_rcu(struct rcu_head *head)
348{
349 struct ust_app_channel *ua_chan =
350 caa_container_of(head, struct ust_app_channel, rcu_head);
351
0b2dc8df
MD
352 ht_cleanup_push(ua_chan->ctx);
353 ht_cleanup_push(ua_chan->events);
36b588ed
MD
354 free(ua_chan);
355}
356
d80a6244
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357/*
358 * Delete ust app channel safely. RCU read lock must be held before calling
359 * this function.
360 */
8b366481 361static
d0b96690
DG
362void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan,
363 struct ust_app *app)
d80a6244
DG
364{
365 int ret;
bec39940 366 struct lttng_ht_iter iter;
d80a6244 367 struct ust_app_event *ua_event;
55cc08a6 368 struct ust_app_ctx *ua_ctx;
030a66fa 369 struct ust_app_stream *stream, *stmp;
7972aab2 370 struct ust_registry_session *registry;
d80a6244 371
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372 assert(ua_chan);
373
374 DBG3("UST app deleting channel %s", ua_chan->name);
375
55cc08a6 376 /* Wipe stream */
d80a6244 377 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
84cd17c6 378 cds_list_del(&stream->list);
d80a6244
DG
379 delete_ust_app_stream(sock, stream);
380 }
381
55cc08a6 382 /* Wipe context */
bec39940 383 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
31746f93 384 cds_list_del(&ua_ctx->list);
bec39940 385 ret = lttng_ht_del(ua_chan->ctx, &iter);
55cc08a6
DG
386 assert(!ret);
387 delete_ust_app_ctx(sock, ua_ctx);
388 }
d80a6244 389
55cc08a6 390 /* Wipe events */
bec39940
DG
391 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
392 node.node) {
393 ret = lttng_ht_del(ua_chan->events, &iter);
525b0740 394 assert(!ret);
d80a6244
DG
395 delete_ust_app_event(sock, ua_event);
396 }
edb67388 397
c8335706
MD
398 if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) {
399 /* Wipe and free registry from session registry. */
400 registry = get_session_registry(ua_chan->session);
401 if (registry) {
402 ust_registry_channel_del_free(registry, ua_chan->key);
403 }
7972aab2 404 }
d0b96690 405
edb67388 406 if (ua_chan->obj != NULL) {
d0b96690
DG
407 /* Remove channel from application UST object descriptor. */
408 iter.iter.node = &ua_chan->ust_objd_node.node;
c6e62271
DG
409 ret = lttng_ht_del(app->ust_objd, &iter);
410 assert(!ret);
ffe60014
DG
411 ret = ustctl_release_object(sock, ua_chan->obj);
412 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
413 ERR("UST app sock %d release channel obj failed with ret %d",
414 sock, ret);
415 }
7972aab2 416 lttng_fd_put(LTTNG_FD_APPS, 1);
edb67388
DG
417 free(ua_chan->obj);
418 }
36b588ed 419 call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu);
d80a6244
DG
420}
421
331744e3 422/*
1b532a60
DG
423 * Push metadata to consumer socket.
424 *
425 * The socket lock MUST be acquired.
426 * The ust app session lock MUST be acquired.
331744e3
JD
427 *
428 * On success, return the len of metadata pushed or else a negative value.
429 */
430ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
431 struct consumer_socket *socket, int send_zero_data)
432{
433 int ret;
434 char *metadata_str = NULL;
435 size_t len, offset;
436 ssize_t ret_val;
437
438 assert(registry);
439 assert(socket);
1b532a60
DG
440
441 /*
442 * On a push metadata error either the consumer is dead or the metadata
443 * channel has been destroyed because its endpoint might have died (e.g:
444 * relayd). If so, the metadata closed flag is set to 1 so we deny pushing
445 * metadata again which is not valid anymore on the consumer side.
446 *
447 * The ust app session mutex locked allows us to make this check without
448 * the registry lock.
449 */
450 if (registry->metadata_closed) {
451 return -EPIPE;
452 }
331744e3
JD
453
454 pthread_mutex_lock(&registry->lock);
455
456 offset = registry->metadata_len_sent;
457 len = registry->metadata_len - registry->metadata_len_sent;
458 if (len == 0) {
459 DBG3("No metadata to push for metadata key %" PRIu64,
460 registry->metadata_key);
461 ret_val = len;
462 if (send_zero_data) {
463 DBG("No metadata to push");
464 goto push_data;
465 }
466 goto end;
467 }
468
469 /* Allocate only what we have to send. */
470 metadata_str = zmalloc(len);
471 if (!metadata_str) {
472 PERROR("zmalloc ust app metadata string");
473 ret_val = -ENOMEM;
474 goto error;
475 }
476 /* Copy what we haven't send out. */
477 memcpy(metadata_str, registry->metadata + offset, len);
478 registry->metadata_len_sent += len;
479
480push_data:
481 pthread_mutex_unlock(&registry->lock);
482 ret = consumer_push_metadata(socket, registry->metadata_key,
483 metadata_str, len, offset);
484 if (ret < 0) {
000baf6a
DG
485 /*
486 * There is an acceptable race here between the registry metadata key
487 * assignment and the creation on the consumer. The session daemon can
488 * concurrently push metadata for this registry while being created on
489 * the consumer since the metadata key of the registry is assigned
490 * *before* it is setup to avoid the consumer to ask for metadata that
491 * could possibly be not found in the session daemon.
492 *
493 * The metadata will get pushed either by the session being stopped or
494 * the consumer requesting metadata if that race is triggered.
495 */
496 if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) {
497 ret = 0;
498 }
ffa3f245
DG
499
500 /* Update back the actual metadata len sent since it failed here. */
501 pthread_mutex_lock(&registry->lock);
502 registry->metadata_len_sent -= len;
503 pthread_mutex_unlock(&registry->lock);
331744e3
JD
504 ret_val = ret;
505 goto error_push;
506 }
507
508 free(metadata_str);
509 return len;
510
511end:
512error:
513 pthread_mutex_unlock(&registry->lock);
514error_push:
515 free(metadata_str);
516 return ret_val;
517}
518
d88aee68
DG
519/*
520 * For a given application and session, push metadata to consumer. The session
521 * lock MUST be acquired here before calling this.
331744e3
JD
522 * Either sock or consumer is required : if sock is NULL, the default
523 * socket to send the metadata is retrieved from consumer, if sock
524 * is not NULL we use it to send the metadata.
d88aee68
DG
525 *
526 * Return 0 on success else a negative error.
527 */
7972aab2
DG
528static int push_metadata(struct ust_registry_session *registry,
529 struct consumer_output *consumer)
d88aee68 530{
331744e3
JD
531 int ret_val;
532 ssize_t ret;
d88aee68
DG
533 struct consumer_socket *socket;
534
7972aab2
DG
535 assert(registry);
536 assert(consumer);
537
538 rcu_read_lock();
d88aee68 539
7972aab2
DG
540 /*
541 * Means that no metadata was assigned to the session. This can happens if
542 * no start has been done previously.
543 */
544 if (!registry->metadata_key) {
331744e3 545 ret_val = 0;
1b532a60 546 goto end_rcu_unlock;
d88aee68
DG
547 }
548
d88aee68 549 /* Get consumer socket to use to push the metadata.*/
7972aab2
DG
550 socket = consumer_find_socket_by_bitness(registry->bits_per_long,
551 consumer);
d88aee68 552 if (!socket) {
331744e3 553 ret_val = -1;
d88aee68
DG
554 goto error_rcu_unlock;
555 }
556
557 /*
558 * TODO: Currently, we hold the socket lock around sampling of the next
559 * metadata segment to ensure we send metadata over the consumer socket in
560 * the correct order. This makes the registry lock nest inside the socket
561 * lock.
562 *
563 * Please note that this is a temporary measure: we should move this lock
564 * back into ust_consumer_push_metadata() when the consumer gets the
565 * ability to reorder the metadata it receives.
566 */
567 pthread_mutex_lock(socket->lock);
331744e3
JD
568 ret = ust_app_push_metadata(registry, socket, 0);
569 pthread_mutex_unlock(socket->lock);
d88aee68 570 if (ret < 0) {
331744e3 571 ret_val = ret;
d88aee68
DG
572 goto error_rcu_unlock;
573 }
574
d88aee68 575 rcu_read_unlock();
d88aee68
DG
576 return 0;
577
d88aee68 578error_rcu_unlock:
1b532a60
DG
579 /*
580 * On error, flag the registry that the metadata is closed. We were unable
581 * to push anything and this means that either the consumer is not
582 * responding or the metadata cache has been destroyed on the consumer.
583 */
584 registry->metadata_closed = 1;
585end_rcu_unlock:
d88aee68 586 rcu_read_unlock();
331744e3 587 return ret_val;
d88aee68
DG
588}
589
590/*
591 * Send to the consumer a close metadata command for the given session. Once
592 * done, the metadata channel is deleted and the session metadata pointer is
593 * nullified. The session lock MUST be acquired here unless the application is
594 * in the destroy path.
595 *
596 * Return 0 on success else a negative value.
597 */
7972aab2
DG
598static int close_metadata(struct ust_registry_session *registry,
599 struct consumer_output *consumer)
d88aee68
DG
600{
601 int ret;
602 struct consumer_socket *socket;
603
7972aab2
DG
604 assert(registry);
605 assert(consumer);
d88aee68 606
7972aab2
DG
607 rcu_read_lock();
608
609 if (!registry->metadata_key || registry->metadata_closed) {
d88aee68 610 ret = 0;
1b532a60 611 goto end;
d88aee68
DG
612 }
613
d88aee68 614 /* Get consumer socket to use to push the metadata.*/
7972aab2
DG
615 socket = consumer_find_socket_by_bitness(registry->bits_per_long,
616 consumer);
d88aee68
DG
617 if (!socket) {
618 ret = -1;
7972aab2 619 goto error;
d88aee68
DG
620 }
621
7972aab2 622 ret = consumer_close_metadata(socket, registry->metadata_key);
d88aee68 623 if (ret < 0) {
7972aab2 624 goto error;
d88aee68
DG
625 }
626
d88aee68 627error:
1b532a60
DG
628 /*
629 * Metadata closed. Even on error this means that the consumer is not
630 * responding or not found so either way a second close should NOT be emit
631 * for this registry.
632 */
633 registry->metadata_closed = 1;
634end:
7972aab2 635 rcu_read_unlock();
d88aee68
DG
636 return ret;
637}
638
36b588ed
MD
639/*
640 * We need to execute ht_destroy outside of RCU read-side critical
0b2dc8df
MD
641 * section and outside of call_rcu thread, so we postpone its execution
642 * using ht_cleanup_push. It is simpler than to change the semantic of
643 * the many callers of delete_ust_app_session().
36b588ed
MD
644 */
645static
646void delete_ust_app_session_rcu(struct rcu_head *head)
647{
648 struct ust_app_session *ua_sess =
649 caa_container_of(head, struct ust_app_session, rcu_head);
650
0b2dc8df 651 ht_cleanup_push(ua_sess->channels);
36b588ed
MD
652 free(ua_sess);
653}
654
d80a6244
DG
655/*
656 * Delete ust app session safely. RCU read lock must be held before calling
657 * this function.
658 */
8b366481 659static
d0b96690
DG
660void delete_ust_app_session(int sock, struct ust_app_session *ua_sess,
661 struct ust_app *app)
d80a6244
DG
662{
663 int ret;
bec39940 664 struct lttng_ht_iter iter;
d80a6244 665 struct ust_app_channel *ua_chan;
7972aab2 666 struct ust_registry_session *registry;
d80a6244 667
d88aee68
DG
668 assert(ua_sess);
669
1b532a60
DG
670 pthread_mutex_lock(&ua_sess->lock);
671
7972aab2 672 registry = get_session_registry(ua_sess);
1b532a60 673 if (registry && !registry->metadata_closed) {
d88aee68 674 /* Push metadata for application before freeing the application. */
7972aab2 675 (void) push_metadata(registry, ua_sess->consumer);
d88aee68 676
7972aab2
DG
677 /*
678 * Don't ask to close metadata for global per UID buffers. Close
1b532a60
DG
679 * metadata only on destroy trace session in this case. Also, the
680 * previous push metadata could have flag the metadata registry to
681 * close so don't send a close command if closed.
7972aab2 682 */
1b532a60
DG
683 if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID &&
684 !registry->metadata_closed) {
7972aab2
DG
685 /* And ask to close it for this session registry. */
686 (void) close_metadata(registry, ua_sess->consumer);
687 }
d80a6244
DG
688 }
689
bec39940
DG
690 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
691 node.node) {
692 ret = lttng_ht_del(ua_sess->channels, &iter);
525b0740 693 assert(!ret);
d0b96690 694 delete_ust_app_channel(sock, ua_chan, app);
d80a6244 695 }
d80a6244 696
7972aab2
DG
697 /* In case of per PID, the registry is kept in the session. */
698 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) {
699 struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id);
700 if (reg_pid) {
701 buffer_reg_pid_remove(reg_pid);
702 buffer_reg_pid_destroy(reg_pid);
703 }
704 }
d0b96690 705
aee6bafd 706 if (ua_sess->handle != -1) {
ffe60014
DG
707 ret = ustctl_release_handle(sock, ua_sess->handle);
708 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
709 ERR("UST app sock %d release session handle failed with ret %d",
710 sock, ret);
711 }
aee6bafd 712 }
1b532a60
DG
713 pthread_mutex_unlock(&ua_sess->lock);
714
36b588ed 715 call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu);
d80a6244 716}
91d76f53
DG
717
718/*
284d8f55
DG
719 * Delete a traceable application structure from the global list. Never call
720 * this function outside of a call_rcu call.
36b588ed
MD
721 *
722 * RCU read side lock should _NOT_ be held when calling this function.
91d76f53 723 */
8b366481
DG
724static
725void delete_ust_app(struct ust_app *app)
91d76f53 726{
8b366481 727 int ret, sock;
d42f20df 728 struct ust_app_session *ua_sess, *tmp_ua_sess;
44d3bd01 729
d80a6244 730 /* Delete ust app sessions info */
852d0037
DG
731 sock = app->sock;
732 app->sock = -1;
d80a6244 733
8b366481 734 /* Wipe sessions */
d42f20df
DG
735 cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head,
736 teardown_node) {
737 /* Free every object in the session and the session. */
36b588ed 738 rcu_read_lock();
d0b96690 739 delete_ust_app_session(sock, ua_sess, app);
36b588ed 740 rcu_read_unlock();
d80a6244 741 }
36b588ed 742
0b2dc8df
MD
743 ht_cleanup_push(app->sessions);
744 ht_cleanup_push(app->ust_objd);
d80a6244 745
6414a713 746 /*
852d0037
DG
747 * Wait until we have deleted the application from the sock hash table
748 * before closing this socket, otherwise an application could re-use the
749 * socket ID and race with the teardown, using the same hash table entry.
750 *
751 * It's OK to leave the close in call_rcu. We want it to stay unique for
752 * all RCU readers that could run concurrently with unregister app,
753 * therefore we _need_ to only close that socket after a grace period. So
754 * it should stay in this RCU callback.
755 *
756 * This close() is a very important step of the synchronization model so
757 * every modification to this function must be carefully reviewed.
6414a713 758 */
799e2c4f
MD
759 ret = close(sock);
760 if (ret) {
761 PERROR("close");
762 }
4063050c 763 lttng_fd_put(LTTNG_FD_APPS, 1);
d80a6244 764
852d0037 765 DBG2("UST app pid %d deleted", app->pid);
284d8f55 766 free(app);
099e26bd
DG
767}
768
769/*
f6a9efaa 770 * URCU intermediate call to delete an UST app.
099e26bd 771 */
8b366481
DG
772static
773void delete_ust_app_rcu(struct rcu_head *head)
099e26bd 774{
bec39940
DG
775 struct lttng_ht_node_ulong *node =
776 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa 777 struct ust_app *app =
852d0037 778 caa_container_of(node, struct ust_app, pid_n);
f6a9efaa 779
852d0037 780 DBG3("Call RCU deleting app PID %d", app->pid);
f6a9efaa 781 delete_ust_app(app);
099e26bd
DG
782}
783
ffe60014
DG
784/*
785 * Delete the session from the application ht and delete the data structure by
786 * freeing every object inside and releasing them.
787 */
d0b96690 788static void destroy_app_session(struct ust_app *app,
ffe60014
DG
789 struct ust_app_session *ua_sess)
790{
791 int ret;
792 struct lttng_ht_iter iter;
793
794 assert(app);
795 assert(ua_sess);
796
797 iter.iter.node = &ua_sess->node.node;
798 ret = lttng_ht_del(app->sessions, &iter);
799 if (ret) {
800 /* Already scheduled for teardown. */
801 goto end;
802 }
803
804 /* Once deleted, free the data structure. */
d0b96690 805 delete_ust_app_session(app->sock, ua_sess, app);
ffe60014
DG
806
807end:
808 return;
809}
810
8b366481
DG
811/*
812 * Alloc new UST app session.
813 */
814static
d0b96690 815struct ust_app_session *alloc_ust_app_session(struct ust_app *app)
8b366481
DG
816{
817 struct ust_app_session *ua_sess;
818
819 /* Init most of the default value by allocating and zeroing */
820 ua_sess = zmalloc(sizeof(struct ust_app_session));
821 if (ua_sess == NULL) {
822 PERROR("malloc");
ffe60014 823 goto error_free;
8b366481
DG
824 }
825
826 ua_sess->handle = -1;
bec39940 827 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
ad7a9107 828 ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA;
84ad93e8 829 pthread_mutex_init(&ua_sess->lock, NULL);
ad7a9107 830
8b366481
DG
831 return ua_sess;
832
ffe60014 833error_free:
8b366481
DG
834 return NULL;
835}
836
837/*
838 * Alloc new UST app channel.
839 */
840static
841struct ust_app_channel *alloc_ust_app_channel(char *name,
d0b96690 842 struct ust_app_session *ua_sess,
ffe60014 843 struct lttng_ust_channel_attr *attr)
8b366481
DG
844{
845 struct ust_app_channel *ua_chan;
846
847 /* Init most of the default value by allocating and zeroing */
848 ua_chan = zmalloc(sizeof(struct ust_app_channel));
849 if (ua_chan == NULL) {
850 PERROR("malloc");
851 goto error;
852 }
853
854 /* Setup channel name */
855 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
856 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
857
858 ua_chan->enabled = 1;
859 ua_chan->handle = -1;
45893984 860 ua_chan->session = ua_sess;
ffe60014 861 ua_chan->key = get_next_channel_key();
bec39940
DG
862 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
863 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
864 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
8b366481
DG
865
866 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
31746f93 867 CDS_INIT_LIST_HEAD(&ua_chan->ctx_list);
8b366481
DG
868
869 /* Copy attributes */
870 if (attr) {
ffe60014 871 /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */
2fe6e7f5
DG
872 ua_chan->attr.subbuf_size = attr->subbuf_size;
873 ua_chan->attr.num_subbuf = attr->num_subbuf;
874 ua_chan->attr.overwrite = attr->overwrite;
875 ua_chan->attr.switch_timer_interval = attr->switch_timer_interval;
876 ua_chan->attr.read_timer_interval = attr->read_timer_interval;
877 ua_chan->attr.output = attr->output;
8b366481 878 }
ffe60014
DG
879 /* By default, the channel is a per cpu channel. */
880 ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU;
8b366481
DG
881
882 DBG3("UST app channel %s allocated", ua_chan->name);
883
884 return ua_chan;
885
886error:
887 return NULL;
888}
889
37f1c236
DG
890/*
891 * Allocate and initialize a UST app stream.
892 *
893 * Return newly allocated stream pointer or NULL on error.
894 */
ffe60014 895struct ust_app_stream *ust_app_alloc_stream(void)
37f1c236
DG
896{
897 struct ust_app_stream *stream = NULL;
898
899 stream = zmalloc(sizeof(*stream));
900 if (stream == NULL) {
901 PERROR("zmalloc ust app stream");
902 goto error;
903 }
904
905 /* Zero could be a valid value for a handle so flag it to -1. */
906 stream->handle = -1;
907
908error:
909 return stream;
910}
911
8b366481
DG
912/*
913 * Alloc new UST app event.
914 */
915static
916struct ust_app_event *alloc_ust_app_event(char *name,
917 struct lttng_ust_event *attr)
918{
919 struct ust_app_event *ua_event;
920
921 /* Init most of the default value by allocating and zeroing */
922 ua_event = zmalloc(sizeof(struct ust_app_event));
923 if (ua_event == NULL) {
924 PERROR("malloc");
925 goto error;
926 }
927
928 ua_event->enabled = 1;
929 strncpy(ua_event->name, name, sizeof(ua_event->name));
930 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
bec39940 931 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
8b366481
DG
932
933 /* Copy attributes */
934 if (attr) {
935 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
936 }
937
938 DBG3("UST app event %s allocated", ua_event->name);
939
940 return ua_event;
941
942error:
943 return NULL;
944}
945
946/*
947 * Alloc new UST app context.
948 */
949static
950struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
951{
952 struct ust_app_ctx *ua_ctx;
953
954 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
955 if (ua_ctx == NULL) {
956 goto error;
957 }
958
31746f93
DG
959 CDS_INIT_LIST_HEAD(&ua_ctx->list);
960
8b366481
DG
961 if (uctx) {
962 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
963 }
964
965 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
966
967error:
968 return ua_ctx;
969}
970
025faf73
DG
971/*
972 * Allocate a filter and copy the given original filter.
973 *
974 * Return allocated filter or NULL on error.
975 */
976static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter(
977 struct lttng_ust_filter_bytecode *orig_f)
978{
979 struct lttng_ust_filter_bytecode *filter = NULL;
980
981 /* Copy filter bytecode */
982 filter = zmalloc(sizeof(*filter) + orig_f->len);
983 if (!filter) {
984 PERROR("zmalloc alloc ust app filter");
985 goto error;
986 }
987
988 memcpy(filter, orig_f, sizeof(*filter) + orig_f->len);
989
990error:
991 return filter;
992}
993
099e26bd 994/*
421cb601
DG
995 * Find an ust_app using the sock and return it. RCU read side lock must be
996 * held before calling this helper function.
099e26bd 997 */
f20baf8e 998struct ust_app *ust_app_find_by_sock(int sock)
099e26bd 999{
bec39940 1000 struct lttng_ht_node_ulong *node;
bec39940 1001 struct lttng_ht_iter iter;
f6a9efaa 1002
852d0037 1003 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 1004 node = lttng_ht_iter_get_node_ulong(&iter);
f6a9efaa
DG
1005 if (node == NULL) {
1006 DBG2("UST app find by sock %d not found", sock);
f6a9efaa
DG
1007 goto error;
1008 }
852d0037
DG
1009
1010 return caa_container_of(node, struct ust_app, sock_n);
f6a9efaa
DG
1011
1012error:
1013 return NULL;
099e26bd
DG
1014}
1015
d0b96690
DG
1016/*
1017 * Find an ust_app using the notify sock and return it. RCU read side lock must
1018 * be held before calling this helper function.
1019 */
1020static struct ust_app *find_app_by_notify_sock(int sock)
1021{
1022 struct lttng_ht_node_ulong *node;
1023 struct lttng_ht_iter iter;
1024
1025 lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock),
1026 &iter);
1027 node = lttng_ht_iter_get_node_ulong(&iter);
1028 if (node == NULL) {
1029 DBG2("UST app find by notify sock %d not found", sock);
1030 goto error;
1031 }
1032
1033 return caa_container_of(node, struct ust_app, notify_sock_n);
1034
1035error:
1036 return NULL;
1037}
1038
025faf73
DG
1039/*
1040 * Lookup for an ust app event based on event name, filter bytecode and the
1041 * event loglevel.
1042 *
1043 * Return an ust_app_event object or NULL on error.
1044 */
18eace3b 1045static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht,
39c5a3a7
JI
1046 char *name, struct lttng_ust_filter_bytecode *filter, int loglevel,
1047 const struct lttng_event_exclusion *exclusion)
18eace3b
DG
1048{
1049 struct lttng_ht_iter iter;
1050 struct lttng_ht_node_str *node;
1051 struct ust_app_event *event = NULL;
1052 struct ust_app_ht_key key;
18eace3b
DG
1053
1054 assert(name);
1055 assert(ht);
1056
1057 /* Setup key for event lookup. */
1058 key.name = name;
1059 key.filter = filter;
1060 key.loglevel = loglevel;
39c5a3a7
JI
1061 /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */
1062 key.exclusion = (struct lttng_ust_event_exclusion *)exclusion;
18eace3b 1063
025faf73
DG
1064 /* Lookup using the event name as hash and a custom match fct. */
1065 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
1066 ht_match_ust_app_event, &key, &iter.iter);
18eace3b
DG
1067 node = lttng_ht_iter_get_node_str(&iter);
1068 if (node == NULL) {
1069 goto end;
1070 }
1071
1072 event = caa_container_of(node, struct ust_app_event, node);
1073
1074end:
18eace3b
DG
1075 return event;
1076}
1077
55cc08a6
DG
1078/*
1079 * Create the channel context on the tracer.
d0b96690
DG
1080 *
1081 * Called with UST app session lock held.
55cc08a6
DG
1082 */
1083static
1084int create_ust_channel_context(struct ust_app_channel *ua_chan,
1085 struct ust_app_ctx *ua_ctx, struct ust_app *app)
1086{
1087 int ret;
1088
840cb59c 1089 health_code_update();
86acf0da 1090
852d0037 1091 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
55cc08a6
DG
1092 ua_chan->obj, &ua_ctx->obj);
1093 if (ret < 0) {
ffe60014
DG
1094 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1095 ERR("UST app create channel context failed for app (pid: %d) "
1096 "with ret %d", app->pid, ret);
1097 } else {
3757b385
DG
1098 /*
1099 * This is normal behavior, an application can die during the
1100 * creation process. Don't report an error so the execution can
1101 * continue normally.
1102 */
1103 ret = 0;
ffe60014
DG
1104 DBG3("UST app disable event failed. Application is dead.");
1105 }
55cc08a6
DG
1106 goto error;
1107 }
1108
1109 ua_ctx->handle = ua_ctx->obj->handle;
1110
d0b96690
DG
1111 DBG2("UST app context handle %d created successfully for channel %s",
1112 ua_ctx->handle, ua_chan->name);
55cc08a6
DG
1113
1114error:
840cb59c 1115 health_code_update();
55cc08a6
DG
1116 return ret;
1117}
1118
53a80697
MD
1119/*
1120 * Set the filter on the tracer.
1121 */
1122static
1123int set_ust_event_filter(struct ust_app_event *ua_event,
1124 struct ust_app *app)
1125{
1126 int ret;
1127
840cb59c 1128 health_code_update();
86acf0da 1129
53a80697 1130 if (!ua_event->filter) {
86acf0da
DG
1131 ret = 0;
1132 goto error;
53a80697
MD
1133 }
1134
1135 ret = ustctl_set_filter(app->sock, ua_event->filter,
1136 ua_event->obj);
1137 if (ret < 0) {
ffe60014
DG
1138 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1139 ERR("UST app event %s filter failed for app (pid: %d) "
1140 "with ret %d", ua_event->attr.name, app->pid, ret);
1141 } else {
3757b385
DG
1142 /*
1143 * This is normal behavior, an application can die during the
1144 * creation process. Don't report an error so the execution can
1145 * continue normally.
1146 */
1147 ret = 0;
ffe60014
DG
1148 DBG3("UST app filter event failed. Application is dead.");
1149 }
53a80697
MD
1150 goto error;
1151 }
1152
1153 DBG2("UST filter set successfully for event %s", ua_event->name);
1154
1155error:
840cb59c 1156 health_code_update();
53a80697
MD
1157 return ret;
1158}
1159
7cc9a73c
JI
1160/*
1161 * Set event exclusions on the tracer.
1162 */
1163static
1164int set_ust_event_exclusion(struct ust_app_event *ua_event,
1165 struct ust_app *app)
1166{
1167 int ret;
1168
1169 health_code_update();
1170
1171 if (!ua_event->exclusion || !ua_event->exclusion->count) {
1172 ret = 0;
1173 goto error;
1174 }
1175
1176 ret = ustctl_set_exclusion(app->sock, ua_event->exclusion,
1177 ua_event->obj);
1178 if (ret < 0) {
1179 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1180 ERR("UST app event %s exclusions failed for app (pid: %d) "
1181 "with ret %d", ua_event->attr.name, app->pid, ret);
1182 } else {
1183 /*
1184 * This is normal behavior, an application can die during the
1185 * creation process. Don't report an error so the execution can
1186 * continue normally.
1187 */
1188 ret = 0;
1189 DBG3("UST app event exclusion failed. Application is dead.");
1190 }
1191 goto error;
1192 }
1193
1194 DBG2("UST exclusion set successfully for event %s", ua_event->name);
1195
1196error:
1197 health_code_update();
1198 return ret;
1199}
1200
9730260e
DG
1201/*
1202 * Disable the specified event on to UST tracer for the UST session.
1203 */
1204static int disable_ust_event(struct ust_app *app,
1205 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
1206{
1207 int ret;
1208
840cb59c 1209 health_code_update();
86acf0da 1210
852d0037 1211 ret = ustctl_disable(app->sock, ua_event->obj);
9730260e 1212 if (ret < 0) {
ffe60014
DG
1213 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1214 ERR("UST app event %s disable failed for app (pid: %d) "
1215 "and session handle %d with ret %d",
1216 ua_event->attr.name, app->pid, ua_sess->handle, ret);
1217 } else {
3757b385
DG
1218 /*
1219 * This is normal behavior, an application can die during the
1220 * creation process. Don't report an error so the execution can
1221 * continue normally.
1222 */
1223 ret = 0;
ffe60014
DG
1224 DBG3("UST app disable event failed. Application is dead.");
1225 }
9730260e
DG
1226 goto error;
1227 }
1228
1229 DBG2("UST app event %s disabled successfully for app (pid: %d)",
852d0037 1230 ua_event->attr.name, app->pid);
9730260e
DG
1231
1232error:
840cb59c 1233 health_code_update();
9730260e
DG
1234 return ret;
1235}
1236
78f0bacd
DG
1237/*
1238 * Disable the specified channel on to UST tracer for the UST session.
1239 */
1240static int disable_ust_channel(struct ust_app *app,
1241 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
1242{
1243 int ret;
1244
840cb59c 1245 health_code_update();
86acf0da 1246
852d0037 1247 ret = ustctl_disable(app->sock, ua_chan->obj);
78f0bacd 1248 if (ret < 0) {
ffe60014
DG
1249 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1250 ERR("UST app channel %s disable failed for app (pid: %d) "
1251 "and session handle %d with ret %d",
1252 ua_chan->name, app->pid, ua_sess->handle, ret);
1253 } else {
3757b385
DG
1254 /*
1255 * This is normal behavior, an application can die during the
1256 * creation process. Don't report an error so the execution can
1257 * continue normally.
1258 */
1259 ret = 0;
ffe60014
DG
1260 DBG3("UST app disable channel failed. Application is dead.");
1261 }
78f0bacd
DG
1262 goto error;
1263 }
1264
78f0bacd 1265 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
852d0037 1266 ua_chan->name, app->pid);
78f0bacd
DG
1267
1268error:
840cb59c 1269 health_code_update();
78f0bacd
DG
1270 return ret;
1271}
1272
1273/*
1274 * Enable the specified channel on to UST tracer for the UST session.
1275 */
1276static int enable_ust_channel(struct ust_app *app,
1277 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
1278{
1279 int ret;
1280
840cb59c 1281 health_code_update();
86acf0da 1282
852d0037 1283 ret = ustctl_enable(app->sock, ua_chan->obj);
78f0bacd 1284 if (ret < 0) {
ffe60014
DG
1285 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1286 ERR("UST app channel %s enable failed for app (pid: %d) "
1287 "and session handle %d with ret %d",
1288 ua_chan->name, app->pid, ua_sess->handle, ret);
1289 } else {
3757b385
DG
1290 /*
1291 * This is normal behavior, an application can die during the
1292 * creation process. Don't report an error so the execution can
1293 * continue normally.
1294 */
1295 ret = 0;
ffe60014
DG
1296 DBG3("UST app enable channel failed. Application is dead.");
1297 }
78f0bacd
DG
1298 goto error;
1299 }
1300
1301 ua_chan->enabled = 1;
1302
1303 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
852d0037 1304 ua_chan->name, app->pid);
78f0bacd
DG
1305
1306error:
840cb59c 1307 health_code_update();
78f0bacd
DG
1308 return ret;
1309}
1310
edb67388
DG
1311/*
1312 * Enable the specified event on to UST tracer for the UST session.
1313 */
1314static int enable_ust_event(struct ust_app *app,
1315 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
1316{
1317 int ret;
1318
840cb59c 1319 health_code_update();
86acf0da 1320
852d0037 1321 ret = ustctl_enable(app->sock, ua_event->obj);
edb67388 1322 if (ret < 0) {
ffe60014
DG
1323 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1324 ERR("UST app event %s enable failed for app (pid: %d) "
1325 "and session handle %d with ret %d",
1326 ua_event->attr.name, app->pid, ua_sess->handle, ret);
1327 } else {
3757b385
DG
1328 /*
1329 * This is normal behavior, an application can die during the
1330 * creation process. Don't report an error so the execution can
1331 * continue normally.
1332 */
1333 ret = 0;
ffe60014
DG
1334 DBG3("UST app enable event failed. Application is dead.");
1335 }
edb67388
DG
1336 goto error;
1337 }
1338
1339 DBG2("UST app event %s enabled successfully for app (pid: %d)",
852d0037 1340 ua_event->attr.name, app->pid);
edb67388
DG
1341
1342error:
840cb59c 1343 health_code_update();
edb67388
DG
1344 return ret;
1345}
1346
099e26bd 1347/*
7972aab2 1348 * Send channel and stream buffer to application.
4f3ab6ee 1349 *
ffe60014 1350 * Return 0 on success. On error, a negative value is returned.
4f3ab6ee 1351 */
7972aab2
DG
1352static int send_channel_pid_to_ust(struct ust_app *app,
1353 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
4f3ab6ee
DG
1354{
1355 int ret;
ffe60014 1356 struct ust_app_stream *stream, *stmp;
4f3ab6ee
DG
1357
1358 assert(app);
ffe60014 1359 assert(ua_sess);
4f3ab6ee 1360 assert(ua_chan);
4f3ab6ee 1361
840cb59c 1362 health_code_update();
4f3ab6ee 1363
7972aab2
DG
1364 DBG("UST app sending channel %s to UST app sock %d", ua_chan->name,
1365 app->sock);
86acf0da 1366
ffe60014
DG
1367 /* Send channel to the application. */
1368 ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
5b4a0ec0 1369 if (ret < 0) {
b551a063
DG
1370 goto error;
1371 }
1372
d88aee68
DG
1373 health_code_update();
1374
ffe60014
DG
1375 /* Send all streams to application. */
1376 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
1377 ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream);
1378 if (ret < 0) {
1379 goto error;
1380 }
1381 /* We don't need the stream anymore once sent to the tracer. */
1382 cds_list_del(&stream->list);
1383 delete_ust_app_stream(-1, stream);
1384 }
ffe60014
DG
1385 /* Flag the channel that it is sent to the application. */
1386 ua_chan->is_sent = 1;
ffe60014 1387
b551a063 1388error:
840cb59c 1389 health_code_update();
b551a063
DG
1390 return ret;
1391}
1392
91d76f53 1393/*
5b4a0ec0 1394 * Create the specified event onto the UST tracer for a UST session.
d0b96690
DG
1395 *
1396 * Should be called with session mutex held.
91d76f53 1397 */
edb67388
DG
1398static
1399int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
1400 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
91d76f53 1401{
5b4a0ec0 1402 int ret = 0;
284d8f55 1403
840cb59c 1404 health_code_update();
86acf0da 1405
5b4a0ec0 1406 /* Create UST event on tracer */
852d0037 1407 ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
5b4a0ec0
DG
1408 &ua_event->obj);
1409 if (ret < 0) {
ffe60014
DG
1410 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1411 ERR("Error ustctl create event %s for app pid: %d with ret %d",
1412 ua_event->attr.name, app->pid, ret);
1413 } else {
3757b385
DG
1414 /*
1415 * This is normal behavior, an application can die during the
1416 * creation process. Don't report an error so the execution can
1417 * continue normally.
1418 */
1419 ret = 0;
ffe60014
DG
1420 DBG3("UST app create event failed. Application is dead.");
1421 }
5b4a0ec0 1422 goto error;
91d76f53 1423 }
f6a9efaa 1424
5b4a0ec0 1425 ua_event->handle = ua_event->obj->handle;
284d8f55 1426
5b4a0ec0 1427 DBG2("UST app event %s created successfully for pid:%d",
852d0037 1428 ua_event->attr.name, app->pid);
f6a9efaa 1429
840cb59c 1430 health_code_update();
86acf0da 1431
025faf73
DG
1432 /* Set filter if one is present. */
1433 if (ua_event->filter) {
1434 ret = set_ust_event_filter(ua_event, app);
1435 if (ret < 0) {
1436 goto error;
1437 }
1438 }
1439
7cc9a73c
JI
1440 /* Set exclusions for the event */
1441 if (ua_event->exclusion) {
1442 ret = set_ust_event_exclusion(ua_event, app);
1443 if (ret < 0) {
1444 goto error;
1445 }
1446 }
1447
8535a6d9 1448 /* If event not enabled, disable it on the tracer */
fc34caaa 1449 if (ua_event->enabled == 0) {
8535a6d9
DG
1450 ret = disable_ust_event(app, ua_sess, ua_event);
1451 if (ret < 0) {
fc34caaa
DG
1452 /*
1453 * If we hit an EPERM, something is wrong with our disable call. If
1454 * we get an EEXIST, there is a problem on the tracer side since we
1455 * just created it.
1456 */
1457 switch (ret) {
49c336c1 1458 case -LTTNG_UST_ERR_PERM:
fc34caaa
DG
1459 /* Code flow problem */
1460 assert(0);
49c336c1 1461 case -LTTNG_UST_ERR_EXIST:
fc34caaa
DG
1462 /* It's OK for our use case. */
1463 ret = 0;
1464 break;
1465 default:
1466 break;
1467 }
8535a6d9
DG
1468 goto error;
1469 }
1470 }
1471
5b4a0ec0 1472error:
840cb59c 1473 health_code_update();
5b4a0ec0 1474 return ret;
91d76f53 1475}
48842b30 1476
5b4a0ec0
DG
1477/*
1478 * Copy data between an UST app event and a LTT event.
1479 */
421cb601 1480static void shadow_copy_event(struct ust_app_event *ua_event,
48842b30
DG
1481 struct ltt_ust_event *uevent)
1482{
b4ffad32
JI
1483 size_t exclusion_alloc_size;
1484
48842b30
DG
1485 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
1486 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
1487
fc34caaa
DG
1488 ua_event->enabled = uevent->enabled;
1489
5b4a0ec0
DG
1490 /* Copy event attributes */
1491 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
1492
53a80697
MD
1493 /* Copy filter bytecode */
1494 if (uevent->filter) {
025faf73
DG
1495 ua_event->filter = alloc_copy_ust_app_filter(uevent->filter);
1496 /* Filter might be NULL here in case of ENONEM. */
53a80697 1497 }
b4ffad32
JI
1498
1499 /* Copy exclusion data */
1500 if (uevent->exclusion) {
1501 exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) +
1502 LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count;
1503 ua_event->exclusion = zmalloc(exclusion_alloc_size);
5f8df26c
JI
1504 if (ua_event->exclusion == NULL) {
1505 PERROR("malloc");
1506 } else {
1507 memcpy(ua_event->exclusion, uevent->exclusion,
1508 exclusion_alloc_size);
b4ffad32
JI
1509 }
1510 }
48842b30
DG
1511}
1512
5b4a0ec0
DG
1513/*
1514 * Copy data between an UST app channel and a LTT channel.
1515 */
421cb601 1516static void shadow_copy_channel(struct ust_app_channel *ua_chan,
48842b30
DG
1517 struct ltt_ust_channel *uchan)
1518{
bec39940 1519 struct lttng_ht_iter iter;
48842b30 1520 struct ltt_ust_event *uevent;
55cc08a6 1521 struct ltt_ust_context *uctx;
48842b30 1522 struct ust_app_event *ua_event;
55cc08a6 1523 struct ust_app_ctx *ua_ctx;
48842b30 1524
fc34caaa 1525 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
48842b30
DG
1526
1527 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
1528 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
ffe60014 1529
1624d5b7
JD
1530 ua_chan->tracefile_size = uchan->tracefile_size;
1531 ua_chan->tracefile_count = uchan->tracefile_count;
1532
ffe60014
DG
1533 /* Copy event attributes since the layout is different. */
1534 ua_chan->attr.subbuf_size = uchan->attr.subbuf_size;
1535 ua_chan->attr.num_subbuf = uchan->attr.num_subbuf;
1536 ua_chan->attr.overwrite = uchan->attr.overwrite;
1537 ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval;
1538 ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval;
1539 ua_chan->attr.output = uchan->attr.output;
1540 /*
1541 * Note that the attribute channel type is not set since the channel on the
1542 * tracing registry side does not have this information.
1543 */
48842b30 1544
fc34caaa 1545 ua_chan->enabled = uchan->enabled;
7972aab2 1546 ua_chan->tracing_channel_id = uchan->id;
fc34caaa 1547
31746f93 1548 cds_list_for_each_entry(uctx, &uchan->ctx_list, list) {
55cc08a6
DG
1549 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
1550 if (ua_ctx == NULL) {
1551 continue;
1552 }
bec39940
DG
1553 lttng_ht_node_init_ulong(&ua_ctx->node,
1554 (unsigned long) ua_ctx->ctx.ctx);
aa3514e9 1555 lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node);
31746f93 1556 cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list);
55cc08a6 1557 }
48842b30 1558
421cb601 1559 /* Copy all events from ltt ust channel to ust app channel */
bec39940 1560 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
18eace3b 1561 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
39c5a3a7 1562 uevent->filter, uevent->attr.loglevel, uevent->exclusion);
18eace3b 1563 if (ua_event == NULL) {
421cb601 1564 DBG2("UST event %s not found on shadow copy channel",
48842b30 1565 uevent->attr.name);
284d8f55 1566 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
48842b30 1567 if (ua_event == NULL) {
5b4a0ec0 1568 continue;
48842b30 1569 }
421cb601 1570 shadow_copy_event(ua_event, uevent);
d0b96690 1571 add_unique_ust_app_event(ua_chan, ua_event);
48842b30 1572 }
48842b30
DG
1573 }
1574
fc34caaa 1575 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
48842b30
DG
1576}
1577
5b4a0ec0
DG
1578/*
1579 * Copy data between a UST app session and a regular LTT session.
1580 */
421cb601 1581static void shadow_copy_session(struct ust_app_session *ua_sess,
bec39940 1582 struct ltt_ust_session *usess, struct ust_app *app)
48842b30 1583{
bec39940
DG
1584 struct lttng_ht_node_str *ua_chan_node;
1585 struct lttng_ht_iter iter;
48842b30
DG
1586 struct ltt_ust_channel *uchan;
1587 struct ust_app_channel *ua_chan;
477d7741
MD
1588 time_t rawtime;
1589 struct tm *timeinfo;
1590 char datetime[16];
1591 int ret;
1592
1593 /* Get date and time for unique app path */
1594 time(&rawtime);
1595 timeinfo = localtime(&rawtime);
1596 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
48842b30 1597
421cb601 1598 DBG2("Shadow copy of session handle %d", ua_sess->handle);
48842b30 1599
7972aab2
DG
1600 ua_sess->tracing_id = usess->id;
1601 ua_sess->id = get_next_session_id();
1602 ua_sess->uid = app->uid;
1603 ua_sess->gid = app->gid;
1604 ua_sess->euid = usess->uid;
1605 ua_sess->egid = usess->gid;
1606 ua_sess->buffer_type = usess->buffer_type;
1607 ua_sess->bits_per_long = app->bits_per_long;
1608 /* There is only one consumer object per session possible. */
1609 ua_sess->consumer = usess->consumer;
2bba9e53 1610 ua_sess->output_traces = usess->output_traces;
ecc48a90 1611 ua_sess->live_timer_interval = usess->live_timer_interval;
84ad93e8
DG
1612 copy_channel_attr_to_ustctl(&ua_sess->metadata_attr,
1613 &usess->metadata_attr);
7972aab2
DG
1614
1615 switch (ua_sess->buffer_type) {
1616 case LTTNG_BUFFER_PER_PID:
1617 ret = snprintf(ua_sess->path, sizeof(ua_sess->path),
dec56f6c 1618 DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid,
7972aab2
DG
1619 datetime);
1620 break;
1621 case LTTNG_BUFFER_PER_UID:
1622 ret = snprintf(ua_sess->path, sizeof(ua_sess->path),
1623 DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long);
1624 break;
1625 default:
1626 assert(0);
1627 goto error;
1628 }
477d7741
MD
1629 if (ret < 0) {
1630 PERROR("asprintf UST shadow copy session");
477d7741 1631 assert(0);
7972aab2 1632 goto error;
477d7741
MD
1633 }
1634
48842b30 1635 /* Iterate over all channels in global domain. */
bec39940
DG
1636 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
1637 uchan, node.node) {
1638 struct lttng_ht_iter uiter;
ba767faf 1639
bec39940
DG
1640 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1641 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
5b4a0ec0 1642 if (ua_chan_node != NULL) {
fc34caaa 1643 /* Session exist. Contiuing. */
5b4a0ec0
DG
1644 continue;
1645 }
421cb601 1646
5b4a0ec0
DG
1647 DBG2("Channel %s not found on shadow session copy, creating it",
1648 uchan->name);
d0b96690 1649 ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr);
5b4a0ec0 1650 if (ua_chan == NULL) {
fc34caaa 1651 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
5b4a0ec0 1652 continue;
48842b30 1653 }
5b4a0ec0 1654 shadow_copy_channel(ua_chan, uchan);
ffe60014
DG
1655 /*
1656 * The concept of metadata channel does not exist on the tracing
1657 * registry side of the session daemon so this can only be a per CPU
1658 * channel and not metadata.
1659 */
1660 ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU;
1661
bec39940 1662 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
48842b30 1663 }
7972aab2
DG
1664
1665error:
1666 return;
48842b30
DG
1667}
1668
78f0bacd
DG
1669/*
1670 * Lookup sesison wrapper.
1671 */
84cd17c6
MD
1672static
1673void __lookup_session_by_app(struct ltt_ust_session *usess,
bec39940 1674 struct ust_app *app, struct lttng_ht_iter *iter)
84cd17c6
MD
1675{
1676 /* Get right UST app session from app */
d9bf3ca4 1677 lttng_ht_lookup(app->sessions, &usess->id, iter);
84cd17c6
MD
1678}
1679
421cb601
DG
1680/*
1681 * Return ust app session from the app session hashtable using the UST session
a991f516 1682 * id.
421cb601 1683 */
48842b30
DG
1684static struct ust_app_session *lookup_session_by_app(
1685 struct ltt_ust_session *usess, struct ust_app *app)
1686{
bec39940 1687 struct lttng_ht_iter iter;
d9bf3ca4 1688 struct lttng_ht_node_u64 *node;
48842b30 1689
84cd17c6 1690 __lookup_session_by_app(usess, app, &iter);
d9bf3ca4 1691 node = lttng_ht_iter_get_node_u64(&iter);
48842b30
DG
1692 if (node == NULL) {
1693 goto error;
1694 }
1695
1696 return caa_container_of(node, struct ust_app_session, node);
1697
1698error:
1699 return NULL;
1700}
1701
7972aab2
DG
1702/*
1703 * Setup buffer registry per PID for the given session and application. If none
1704 * is found, a new one is created, added to the global registry and
1705 * initialized. If regp is valid, it's set with the newly created object.
1706 *
1707 * Return 0 on success or else a negative value.
1708 */
1709static int setup_buffer_reg_pid(struct ust_app_session *ua_sess,
1710 struct ust_app *app, struct buffer_reg_pid **regp)
1711{
1712 int ret = 0;
1713 struct buffer_reg_pid *reg_pid;
1714
1715 assert(ua_sess);
1716 assert(app);
1717
1718 rcu_read_lock();
1719
1720 reg_pid = buffer_reg_pid_find(ua_sess->id);
1721 if (!reg_pid) {
1722 /*
1723 * This is the create channel path meaning that if there is NO
1724 * registry available, we have to create one for this session.
1725 */
1726 ret = buffer_reg_pid_create(ua_sess->id, &reg_pid);
1727 if (ret < 0) {
1728 goto error;
1729 }
1730 buffer_reg_pid_add(reg_pid);
1731 } else {
1732 goto end;
1733 }
1734
1735 /* Initialize registry. */
1736 ret = ust_registry_session_init(&reg_pid->registry->reg.ust, app,
1737 app->bits_per_long, app->uint8_t_alignment,
1738 app->uint16_t_alignment, app->uint32_t_alignment,
af6142cf
MD
1739 app->uint64_t_alignment, app->long_alignment,
1740 app->byte_order, app->version.major,
1741 app->version.minor);
7972aab2
DG
1742 if (ret < 0) {
1743 goto error;
1744 }
1745
1746 DBG3("UST app buffer registry per PID created successfully");
1747
1748end:
1749 if (regp) {
1750 *regp = reg_pid;
1751 }
1752error:
1753 rcu_read_unlock();
1754 return ret;
1755}
1756
1757/*
1758 * Setup buffer registry per UID for the given session and application. If none
1759 * is found, a new one is created, added to the global registry and
1760 * initialized. If regp is valid, it's set with the newly created object.
1761 *
1762 * Return 0 on success or else a negative value.
1763 */
1764static int setup_buffer_reg_uid(struct ltt_ust_session *usess,
1765 struct ust_app *app, struct buffer_reg_uid **regp)
1766{
1767 int ret = 0;
1768 struct buffer_reg_uid *reg_uid;
1769
1770 assert(usess);
1771 assert(app);
1772
1773 rcu_read_lock();
1774
1775 reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid);
1776 if (!reg_uid) {
1777 /*
1778 * This is the create channel path meaning that if there is NO
1779 * registry available, we have to create one for this session.
1780 */
1781 ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid,
1782 LTTNG_DOMAIN_UST, &reg_uid);
1783 if (ret < 0) {
1784 goto error;
1785 }
1786 buffer_reg_uid_add(reg_uid);
1787 } else {
1788 goto end;
1789 }
1790
1791 /* Initialize registry. */
af6142cf 1792 ret = ust_registry_session_init(&reg_uid->registry->reg.ust, NULL,
7972aab2
DG
1793 app->bits_per_long, app->uint8_t_alignment,
1794 app->uint16_t_alignment, app->uint32_t_alignment,
af6142cf
MD
1795 app->uint64_t_alignment, app->long_alignment,
1796 app->byte_order, app->version.major,
1797 app->version.minor);
7972aab2
DG
1798 if (ret < 0) {
1799 goto error;
1800 }
1801 /* Add node to teardown list of the session. */
1802 cds_list_add(&reg_uid->lnode, &usess->buffer_reg_uid_list);
1803
1804 DBG3("UST app buffer registry per UID created successfully");
1805
1806end:
1807 if (regp) {
1808 *regp = reg_uid;
1809 }
1810error:
1811 rcu_read_unlock();
1812 return ret;
1813}
1814
421cb601 1815/*
3d8ca23b 1816 * Create a session on the tracer side for the given app.
421cb601 1817 *
3d8ca23b
DG
1818 * On success, ua_sess_ptr is populated with the session pointer or else left
1819 * untouched. If the session was created, is_created is set to 1. On error,
1820 * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can
1821 * be NULL.
1822 *
1823 * Returns 0 on success or else a negative code which is either -ENOMEM or
1824 * -ENOTCONN which is the default code if the ustctl_create_session fails.
421cb601 1825 */
3d8ca23b
DG
1826static int create_ust_app_session(struct ltt_ust_session *usess,
1827 struct ust_app *app, struct ust_app_session **ua_sess_ptr,
1828 int *is_created)
421cb601 1829{
3d8ca23b 1830 int ret, created = 0;
421cb601
DG
1831 struct ust_app_session *ua_sess;
1832
3d8ca23b
DG
1833 assert(usess);
1834 assert(app);
1835 assert(ua_sess_ptr);
1836
840cb59c 1837 health_code_update();
86acf0da 1838
421cb601
DG
1839 ua_sess = lookup_session_by_app(usess, app);
1840 if (ua_sess == NULL) {
d9bf3ca4 1841 DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it",
852d0037 1842 app->pid, usess->id);
d0b96690 1843 ua_sess = alloc_ust_app_session(app);
421cb601
DG
1844 if (ua_sess == NULL) {
1845 /* Only malloc can failed so something is really wrong */
3d8ca23b
DG
1846 ret = -ENOMEM;
1847 goto error;
421cb601 1848 }
477d7741 1849 shadow_copy_session(ua_sess, usess, app);
3d8ca23b 1850 created = 1;
421cb601
DG
1851 }
1852
7972aab2
DG
1853 switch (usess->buffer_type) {
1854 case LTTNG_BUFFER_PER_PID:
1855 /* Init local registry. */
1856 ret = setup_buffer_reg_pid(ua_sess, app, NULL);
421cb601 1857 if (ret < 0) {
7972aab2
DG
1858 goto error;
1859 }
1860 break;
1861 case LTTNG_BUFFER_PER_UID:
1862 /* Look for a global registry. If none exists, create one. */
1863 ret = setup_buffer_reg_uid(usess, app, NULL);
1864 if (ret < 0) {
1865 goto error;
1866 }
1867 break;
1868 default:
1869 assert(0);
1870 ret = -EINVAL;
1871 goto error;
1872 }
1873
1874 health_code_update();
1875
1876 if (ua_sess->handle == -1) {
1877 ret = ustctl_create_session(app->sock);
1878 if (ret < 0) {
1879 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1880 ERR("Creating session for app pid %d with ret %d",
ffe60014
DG
1881 app->pid, ret);
1882 } else {
1883 DBG("UST app creating session failed. Application is dead");
3757b385
DG
1884 /*
1885 * This is normal behavior, an application can die during the
1886 * creation process. Don't report an error so the execution can
1887 * continue normally. This will get flagged ENOTCONN and the
1888 * caller will handle it.
1889 */
1890 ret = 0;
ffe60014 1891 }
d0b96690 1892 delete_ust_app_session(-1, ua_sess, app);
3d8ca23b
DG
1893 if (ret != -ENOMEM) {
1894 /*
1895 * Tracer is probably gone or got an internal error so let's
1896 * behave like it will soon unregister or not usable.
1897 */
1898 ret = -ENOTCONN;
1899 }
1900 goto error;
421cb601
DG
1901 }
1902
7972aab2
DG
1903 ua_sess->handle = ret;
1904
1905 /* Add ust app session to app's HT */
d9bf3ca4
MD
1906 lttng_ht_node_init_u64(&ua_sess->node,
1907 ua_sess->tracing_id);
1908 lttng_ht_add_unique_u64(app->sessions, &ua_sess->node);
7972aab2
DG
1909
1910 DBG2("UST app session created successfully with handle %d", ret);
1911 }
1912
1913 *ua_sess_ptr = ua_sess;
1914 if (is_created) {
1915 *is_created = created;
1916 }
1917
1918 /* Everything went well. */
1919 ret = 0;
1920
1921error:
1922 health_code_update();
1923 return ret;
1924}
1925
1926/*
1927 * Create a context for the channel on the tracer.
1928 *
1929 * Called with UST app session lock held and a RCU read side lock.
1930 */
1931static
1932int create_ust_app_channel_context(struct ust_app_session *ua_sess,
1933 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
1934 struct ust_app *app)
1935{
1936 int ret = 0;
1937 struct lttng_ht_iter iter;
1938 struct lttng_ht_node_ulong *node;
1939 struct ust_app_ctx *ua_ctx;
1940
1941 DBG2("UST app adding context to channel %s", ua_chan->name);
1942
1943 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1944 node = lttng_ht_iter_get_node_ulong(&iter);
1945 if (node != NULL) {
1946 ret = -EEXIST;
1947 goto error;
1948 }
1949
1950 ua_ctx = alloc_ust_app_ctx(uctx);
1951 if (ua_ctx == NULL) {
1952 /* malloc failed */
1953 ret = -1;
1954 goto error;
1955 }
1956
1957 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
aa3514e9 1958 lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node);
31746f93 1959 cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list);
7972aab2
DG
1960
1961 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
1962 if (ret < 0) {
1963 goto error;
1964 }
1965
1966error:
1967 return ret;
1968}
1969
1970/*
1971 * Enable on the tracer side a ust app event for the session and channel.
1972 *
1973 * Called with UST app session lock held.
1974 */
1975static
1976int enable_ust_app_event(struct ust_app_session *ua_sess,
1977 struct ust_app_event *ua_event, struct ust_app *app)
1978{
1979 int ret;
1980
1981 ret = enable_ust_event(app, ua_sess, ua_event);
1982 if (ret < 0) {
1983 goto error;
1984 }
1985
1986 ua_event->enabled = 1;
1987
1988error:
1989 return ret;
1990}
1991
1992/*
1993 * Disable on the tracer side a ust app event for the session and channel.
1994 */
1995static int disable_ust_app_event(struct ust_app_session *ua_sess,
1996 struct ust_app_event *ua_event, struct ust_app *app)
1997{
1998 int ret;
1999
2000 ret = disable_ust_event(app, ua_sess, ua_event);
2001 if (ret < 0) {
2002 goto error;
2003 }
2004
2005 ua_event->enabled = 0;
2006
2007error:
2008 return ret;
2009}
2010
2011/*
2012 * Lookup ust app channel for session and disable it on the tracer side.
2013 */
2014static
2015int disable_ust_app_channel(struct ust_app_session *ua_sess,
2016 struct ust_app_channel *ua_chan, struct ust_app *app)
2017{
2018 int ret;
2019
2020 ret = disable_ust_channel(app, ua_sess, ua_chan);
2021 if (ret < 0) {
2022 goto error;
2023 }
2024
2025 ua_chan->enabled = 0;
2026
2027error:
2028 return ret;
2029}
2030
2031/*
2032 * Lookup ust app channel for session and enable it on the tracer side. This
2033 * MUST be called with a RCU read side lock acquired.
2034 */
2035static int enable_ust_app_channel(struct ust_app_session *ua_sess,
2036 struct ltt_ust_channel *uchan, struct ust_app *app)
2037{
2038 int ret = 0;
2039 struct lttng_ht_iter iter;
2040 struct lttng_ht_node_str *ua_chan_node;
2041 struct ust_app_channel *ua_chan;
2042
2043 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2044 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2045 if (ua_chan_node == NULL) {
d9bf3ca4 2046 DBG2("Unable to find channel %s in ust session id %" PRIu64,
7972aab2
DG
2047 uchan->name, ua_sess->tracing_id);
2048 goto error;
2049 }
2050
2051 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2052
2053 ret = enable_ust_channel(app, ua_sess, ua_chan);
2054 if (ret < 0) {
2055 goto error;
2056 }
2057
2058error:
2059 return ret;
2060}
2061
2062/*
2063 * Ask the consumer to create a channel and get it if successful.
2064 *
2065 * Return 0 on success or else a negative value.
2066 */
2067static int do_consumer_create_channel(struct ltt_ust_session *usess,
2068 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan,
2069 int bitness, struct ust_registry_session *registry)
2070{
2071 int ret;
2072 unsigned int nb_fd = 0;
2073 struct consumer_socket *socket;
2074
2075 assert(usess);
2076 assert(ua_sess);
2077 assert(ua_chan);
2078 assert(registry);
2079
2080 rcu_read_lock();
2081 health_code_update();
2082
2083 /* Get the right consumer socket for the application. */
2084 socket = consumer_find_socket_by_bitness(bitness, usess->consumer);
2085 if (!socket) {
2086 ret = -EINVAL;
2087 goto error;
2088 }
2089
2090 health_code_update();
2091
2092 /* Need one fd for the channel. */
2093 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2094 if (ret < 0) {
2095 ERR("Exhausted number of available FD upon create channel");
2096 goto error;
2097 }
2098
2099 /*
2100 * Ask consumer to create channel. The consumer will return the number of
2101 * stream we have to expect.
2102 */
2103 ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket,
2104 registry);
2105 if (ret < 0) {
2106 goto error_ask;
2107 }
2108
2109 /*
2110 * Compute the number of fd needed before receiving them. It must be 2 per
2111 * stream (2 being the default value here).
2112 */
2113 nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count;
2114
2115 /* Reserve the amount of file descriptor we need. */
2116 ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd);
2117 if (ret < 0) {
2118 ERR("Exhausted number of available FD upon create channel");
2119 goto error_fd_get_stream;
2120 }
2121
2122 health_code_update();
2123
2124 /*
2125 * Now get the channel from the consumer. This call wil populate the stream
2126 * list of that channel and set the ust objects.
2127 */
d9078d0c
DG
2128 if (usess->consumer->enabled) {
2129 ret = ust_consumer_get_channel(socket, ua_chan);
2130 if (ret < 0) {
2131 goto error_destroy;
2132 }
7972aab2
DG
2133 }
2134
2135 rcu_read_unlock();
2136 return 0;
2137
2138error_destroy:
2139 lttng_fd_put(LTTNG_FD_APPS, nb_fd);
2140error_fd_get_stream:
2141 /*
2142 * Initiate a destroy channel on the consumer since we had an error
2143 * handling it on our side. The return value is of no importance since we
2144 * already have a ret value set by the previous error that we need to
2145 * return.
2146 */
2147 (void) ust_consumer_destroy_channel(socket, ua_chan);
2148error_ask:
2149 lttng_fd_put(LTTNG_FD_APPS, 1);
2150error:
2151 health_code_update();
2152 rcu_read_unlock();
2153 return ret;
2154}
2155
2156/*
2157 * Duplicate the ust data object of the ust app stream and save it in the
2158 * buffer registry stream.
2159 *
2160 * Return 0 on success or else a negative value.
2161 */
2162static int duplicate_stream_object(struct buffer_reg_stream *reg_stream,
2163 struct ust_app_stream *stream)
2164{
2165 int ret;
2166
2167 assert(reg_stream);
2168 assert(stream);
2169
2170 /* Reserve the amount of file descriptor we need. */
2171 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2172 if (ret < 0) {
2173 ERR("Exhausted number of available FD upon duplicate stream");
2174 goto error;
2175 }
2176
2177 /* Duplicate object for stream once the original is in the registry. */
2178 ret = ustctl_duplicate_ust_object_data(&stream->obj,
2179 reg_stream->obj.ust);
2180 if (ret < 0) {
2181 ERR("Duplicate stream obj from %p to %p failed with ret %d",
2182 reg_stream->obj.ust, stream->obj, ret);
2183 lttng_fd_put(LTTNG_FD_APPS, 2);
2184 goto error;
2185 }
2186 stream->handle = stream->obj->handle;
2187
2188error:
2189 return ret;
2190}
2191
2192/*
2193 * Duplicate the ust data object of the ust app. channel and save it in the
2194 * buffer registry channel.
2195 *
2196 * Return 0 on success or else a negative value.
2197 */
2198static int duplicate_channel_object(struct buffer_reg_channel *reg_chan,
2199 struct ust_app_channel *ua_chan)
2200{
2201 int ret;
2202
2203 assert(reg_chan);
2204 assert(ua_chan);
2205
2206 /* Need two fds for the channel. */
2207 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2208 if (ret < 0) {
2209 ERR("Exhausted number of available FD upon duplicate channel");
2210 goto error_fd_get;
2211 }
2212
2213 /* Duplicate object for stream once the original is in the registry. */
2214 ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust);
2215 if (ret < 0) {
2216 ERR("Duplicate channel obj from %p to %p failed with ret: %d",
2217 reg_chan->obj.ust, ua_chan->obj, ret);
2218 goto error;
2219 }
2220 ua_chan->handle = ua_chan->obj->handle;
2221
2222 return 0;
2223
2224error:
2225 lttng_fd_put(LTTNG_FD_APPS, 1);
2226error_fd_get:
2227 return ret;
2228}
2229
2230/*
2231 * For a given channel buffer registry, setup all streams of the given ust
2232 * application channel.
2233 *
2234 * Return 0 on success or else a negative value.
2235 */
2236static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan,
2237 struct ust_app_channel *ua_chan)
2238{
2239 int ret = 0;
2240 struct ust_app_stream *stream, *stmp;
2241
2242 assert(reg_chan);
2243 assert(ua_chan);
2244
2245 DBG2("UST app setup buffer registry stream");
2246
2247 /* Send all streams to application. */
2248 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
2249 struct buffer_reg_stream *reg_stream;
2250
2251 ret = buffer_reg_stream_create(&reg_stream);
2252 if (ret < 0) {
2253 goto error;
2254 }
2255
2256 /*
2257 * Keep original pointer and nullify it in the stream so the delete
2258 * stream call does not release the object.
2259 */
2260 reg_stream->obj.ust = stream->obj;
2261 stream->obj = NULL;
2262 buffer_reg_stream_add(reg_stream, reg_chan);
421cb601 2263
7972aab2
DG
2264 /* We don't need the streams anymore. */
2265 cds_list_del(&stream->list);
2266 delete_ust_app_stream(-1, stream);
2267 }
421cb601 2268
7972aab2
DG
2269error:
2270 return ret;
2271}
2272
2273/*
2274 * Create a buffer registry channel for the given session registry and
2275 * application channel object. If regp pointer is valid, it's set with the
2276 * created object. Important, the created object is NOT added to the session
2277 * registry hash table.
2278 *
2279 * Return 0 on success else a negative value.
2280 */
2281static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess,
2282 struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp)
2283{
2284 int ret;
2285 struct buffer_reg_channel *reg_chan = NULL;
2286
2287 assert(reg_sess);
2288 assert(ua_chan);
2289
2290 DBG2("UST app creating buffer registry channel for %s", ua_chan->name);
2291
2292 /* Create buffer registry channel. */
2293 ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, &reg_chan);
2294 if (ret < 0) {
2295 goto error_create;
421cb601 2296 }
7972aab2
DG
2297 assert(reg_chan);
2298 reg_chan->consumer_key = ua_chan->key;
8c924c7b 2299 reg_chan->subbuf_size = ua_chan->attr.subbuf_size;
421cb601 2300
7972aab2
DG
2301 /* Create and add a channel registry to session. */
2302 ret = ust_registry_channel_add(reg_sess->reg.ust,
2303 ua_chan->tracing_channel_id);
2304 if (ret < 0) {
2305 goto error;
d88aee68 2306 }
7972aab2 2307 buffer_reg_channel_add(reg_sess, reg_chan);
d88aee68 2308
7972aab2
DG
2309 if (regp) {
2310 *regp = reg_chan;
3d8ca23b 2311 }
d88aee68 2312
7972aab2 2313 return 0;
3d8ca23b
DG
2314
2315error:
7972aab2
DG
2316 /* Safe because the registry channel object was not added to any HT. */
2317 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
2318error_create:
3d8ca23b 2319 return ret;
421cb601
DG
2320}
2321
55cc08a6 2322/*
7972aab2
DG
2323 * Setup buffer registry channel for the given session registry and application
2324 * channel object. If regp pointer is valid, it's set with the created object.
d0b96690 2325 *
7972aab2 2326 * Return 0 on success else a negative value.
55cc08a6 2327 */
7972aab2
DG
2328static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess,
2329 struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan)
55cc08a6 2330{
7972aab2 2331 int ret;
55cc08a6 2332
7972aab2
DG
2333 assert(reg_sess);
2334 assert(reg_chan);
2335 assert(ua_chan);
2336 assert(ua_chan->obj);
55cc08a6 2337
7972aab2 2338 DBG2("UST app setup buffer registry channel for %s", ua_chan->name);
55cc08a6 2339
7972aab2
DG
2340 /* Setup all streams for the registry. */
2341 ret = setup_buffer_reg_streams(reg_chan, ua_chan);
2342 if (ret < 0) {
55cc08a6
DG
2343 goto error;
2344 }
2345
7972aab2
DG
2346 reg_chan->obj.ust = ua_chan->obj;
2347 ua_chan->obj = NULL;
55cc08a6 2348
7972aab2 2349 return 0;
55cc08a6
DG
2350
2351error:
7972aab2
DG
2352 buffer_reg_channel_remove(reg_sess, reg_chan);
2353 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
55cc08a6
DG
2354 return ret;
2355}
2356
edb67388 2357/*
7972aab2 2358 * Send buffer registry channel to the application.
d0b96690 2359 *
7972aab2 2360 * Return 0 on success else a negative value.
edb67388 2361 */
7972aab2
DG
2362static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan,
2363 struct ust_app *app, struct ust_app_session *ua_sess,
2364 struct ust_app_channel *ua_chan)
edb67388
DG
2365{
2366 int ret;
7972aab2 2367 struct buffer_reg_stream *reg_stream;
edb67388 2368
7972aab2
DG
2369 assert(reg_chan);
2370 assert(app);
2371 assert(ua_sess);
2372 assert(ua_chan);
2373
2374 DBG("UST app sending buffer registry channel to ust sock %d", app->sock);
2375
2376 ret = duplicate_channel_object(reg_chan, ua_chan);
edb67388
DG
2377 if (ret < 0) {
2378 goto error;
2379 }
2380
7972aab2
DG
2381 /* Send channel to the application. */
2382 ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
2383 if (ret < 0) {
2384 goto error;
2385 }
2386
2387 health_code_update();
2388
2389 /* Send all streams to application. */
2390 pthread_mutex_lock(&reg_chan->stream_list_lock);
2391 cds_list_for_each_entry(reg_stream, &reg_chan->streams, lnode) {
2392 struct ust_app_stream stream;
2393
2394 ret = duplicate_stream_object(reg_stream, &stream);
2395 if (ret < 0) {
2396 goto error_stream_unlock;
2397 }
2398
2399 ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream);
2400 if (ret < 0) {
8c067051 2401 (void) release_ust_app_stream(-1, &stream);
7972aab2
DG
2402 goto error_stream_unlock;
2403 }
edb67388 2404
7972aab2
DG
2405 /*
2406 * The return value is not important here. This function will output an
2407 * error if needed.
2408 */
2409 (void) release_ust_app_stream(-1, &stream);
2410 }
2411 ua_chan->is_sent = 1;
2412
2413error_stream_unlock:
2414 pthread_mutex_unlock(&reg_chan->stream_list_lock);
edb67388
DG
2415error:
2416 return ret;
2417}
2418
9730260e 2419/*
7972aab2
DG
2420 * Create and send to the application the created buffers with per UID buffers.
2421 *
2422 * Return 0 on success else a negative value.
9730260e 2423 */
7972aab2
DG
2424static int create_channel_per_uid(struct ust_app *app,
2425 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2426 struct ust_app_channel *ua_chan)
9730260e
DG
2427{
2428 int ret;
7972aab2
DG
2429 struct buffer_reg_uid *reg_uid;
2430 struct buffer_reg_channel *reg_chan;
9730260e 2431
7972aab2
DG
2432 assert(app);
2433 assert(usess);
2434 assert(ua_sess);
2435 assert(ua_chan);
2436
2437 DBG("UST app creating channel %s with per UID buffers", ua_chan->name);
2438
2439 reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid);
2440 /*
2441 * The session creation handles the creation of this global registry
2442 * object. If none can be find, there is a code flow problem or a
2443 * teardown race.
2444 */
2445 assert(reg_uid);
2446
2447 reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id,
2448 reg_uid);
2449 if (!reg_chan) {
2450 /* Create the buffer registry channel object. */
2451 ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, &reg_chan);
2452 if (ret < 0) {
f14256d6
MD
2453 ERR("Error creating the UST channel \"%s\" registry instance",
2454 ua_chan->name);
7972aab2
DG
2455 goto error;
2456 }
2457 assert(reg_chan);
2458
2459 /*
2460 * Create the buffers on the consumer side. This call populates the
2461 * ust app channel object with all streams and data object.
2462 */
2463 ret = do_consumer_create_channel(usess, ua_sess, ua_chan,
2464 app->bits_per_long, reg_uid->registry->reg.ust);
2465 if (ret < 0) {
f14256d6
MD
2466 ERR("Error creating UST channel \"%s\" on the consumer daemon",
2467 ua_chan->name);
2468
07d2ae95
DG
2469 /*
2470 * Let's remove the previously created buffer registry channel so
2471 * it's not visible anymore in the session registry.
2472 */
2473 ust_registry_channel_del_free(reg_uid->registry->reg.ust,
2474 ua_chan->tracing_channel_id);
2475 buffer_reg_channel_remove(reg_uid->registry, reg_chan);
2476 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
7972aab2
DG
2477 goto error;
2478 }
2479
2480 /*
2481 * Setup the streams and add it to the session registry.
2482 */
2483 ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan);
2484 if (ret < 0) {
f14256d6
MD
2485 ERR("Error setting up UST channel \"%s\"",
2486 ua_chan->name);
7972aab2
DG
2487 goto error;
2488 }
2489
2490 }
2491
2492 /* Send buffers to the application. */
2493 ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan);
9730260e 2494 if (ret < 0) {
f14256d6
MD
2495 /*
2496 * Don't report error to the console, since it may be
2497 * caused by application concurrently exiting.
2498 */
9730260e
DG
2499 goto error;
2500 }
2501
9730260e
DG
2502error:
2503 return ret;
2504}
2505
78f0bacd 2506/*
7972aab2
DG
2507 * Create and send to the application the created buffers with per PID buffers.
2508 *
2509 * Return 0 on success else a negative value.
78f0bacd 2510 */
7972aab2
DG
2511static int create_channel_per_pid(struct ust_app *app,
2512 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2513 struct ust_app_channel *ua_chan)
78f0bacd 2514{
8535a6d9 2515 int ret;
7972aab2 2516 struct ust_registry_session *registry;
78f0bacd 2517
7972aab2
DG
2518 assert(app);
2519 assert(usess);
2520 assert(ua_sess);
2521 assert(ua_chan);
2522
2523 DBG("UST app creating channel %s with per PID buffers", ua_chan->name);
2524
2525 rcu_read_lock();
2526
2527 registry = get_session_registry(ua_sess);
2528 assert(registry);
2529
2530 /* Create and add a new channel registry to session. */
2531 ret = ust_registry_channel_add(registry, ua_chan->key);
78f0bacd 2532 if (ret < 0) {
f14256d6
MD
2533 ERR("Error creating the UST channel \"%s\" registry instance",
2534 ua_chan->name);
78f0bacd
DG
2535 goto error;
2536 }
2537
7972aab2
DG
2538 /* Create and get channel on the consumer side. */
2539 ret = do_consumer_create_channel(usess, ua_sess, ua_chan,
2540 app->bits_per_long, registry);
2541 if (ret < 0) {
f14256d6
MD
2542 ERR("Error creating UST channel \"%s\" on the consumer daemon",
2543 ua_chan->name);
7972aab2
DG
2544 goto error;
2545 }
2546
2547 ret = send_channel_pid_to_ust(app, ua_sess, ua_chan);
2548 if (ret < 0) {
f14256d6
MD
2549 /*
2550 * Don't report error to the console, since it may be
2551 * caused by application concurrently exiting.
2552 */
7972aab2
DG
2553 goto error;
2554 }
8535a6d9 2555
78f0bacd 2556error:
7972aab2 2557 rcu_read_unlock();
78f0bacd
DG
2558 return ret;
2559}
2560
2561/*
7972aab2
DG
2562 * From an already allocated ust app channel, create the channel buffers if
2563 * need and send it to the application. This MUST be called with a RCU read
2564 * side lock acquired.
2565 *
2566 * Return 0 on success or else a negative value.
78f0bacd 2567 */
7972aab2
DG
2568static int do_create_channel(struct ust_app *app,
2569 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2570 struct ust_app_channel *ua_chan)
78f0bacd 2571{
7972aab2 2572 int ret;
78f0bacd 2573
7972aab2
DG
2574 assert(app);
2575 assert(usess);
2576 assert(ua_sess);
2577 assert(ua_chan);
2578
2579 /* Handle buffer type before sending the channel to the application. */
2580 switch (usess->buffer_type) {
2581 case LTTNG_BUFFER_PER_UID:
2582 {
2583 ret = create_channel_per_uid(app, usess, ua_sess, ua_chan);
2584 if (ret < 0) {
2585 goto error;
2586 }
2587 break;
2588 }
2589 case LTTNG_BUFFER_PER_PID:
2590 {
2591 ret = create_channel_per_pid(app, usess, ua_sess, ua_chan);
2592 if (ret < 0) {
2593 goto error;
2594 }
2595 break;
2596 }
2597 default:
2598 assert(0);
2599 ret = -EINVAL;
78f0bacd
DG
2600 goto error;
2601 }
2602
7972aab2
DG
2603 /* Initialize ust objd object using the received handle and add it. */
2604 lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle);
2605 lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node);
78f0bacd 2606
7972aab2
DG
2607 /* If channel is not enabled, disable it on the tracer */
2608 if (!ua_chan->enabled) {
2609 ret = disable_ust_channel(app, ua_sess, ua_chan);
2610 if (ret < 0) {
2611 goto error;
2612 }
78f0bacd
DG
2613 }
2614
2615error:
2616 return ret;
2617}
2618
284d8f55 2619/*
4d710ac2
DG
2620 * Create UST app channel and create it on the tracer. Set ua_chanp of the
2621 * newly created channel if not NULL.
d0b96690 2622 *
36b588ed 2623 * Called with UST app session lock and RCU read-side lock held.
7972aab2
DG
2624 *
2625 * Return 0 on success or else a negative value.
284d8f55 2626 */
4d710ac2
DG
2627static int create_ust_app_channel(struct ust_app_session *ua_sess,
2628 struct ltt_ust_channel *uchan, struct ust_app *app,
7972aab2 2629 enum lttng_ust_chan_type type, struct ltt_ust_session *usess,
4d710ac2 2630 struct ust_app_channel **ua_chanp)
5b4a0ec0
DG
2631{
2632 int ret = 0;
bec39940
DG
2633 struct lttng_ht_iter iter;
2634 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
2635 struct ust_app_channel *ua_chan;
2636
2637 /* Lookup channel in the ust app session */
bec39940
DG
2638 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2639 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
fc34caaa 2640 if (ua_chan_node != NULL) {
5b4a0ec0 2641 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
fc34caaa 2642 goto end;
5b4a0ec0
DG
2643 }
2644
d0b96690 2645 ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr);
fc34caaa
DG
2646 if (ua_chan == NULL) {
2647 /* Only malloc can fail here */
4d710ac2 2648 ret = -ENOMEM;
094d1690 2649 goto error_alloc;
fc34caaa
DG
2650 }
2651 shadow_copy_channel(ua_chan, uchan);
2652
ffe60014
DG
2653 /* Set channel type. */
2654 ua_chan->attr.type = type;
2655
7972aab2 2656 ret = do_create_channel(app, usess, ua_sess, ua_chan);
5b4a0ec0
DG
2657 if (ret < 0) {
2658 goto error;
2659 }
2660
fc34caaa 2661 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
852d0037 2662 app->pid);
fc34caaa 2663
d0b96690
DG
2664 /* Only add the channel if successful on the tracer side. */
2665 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
2666
fc34caaa 2667end:
4d710ac2
DG
2668 if (ua_chanp) {
2669 *ua_chanp = ua_chan;
2670 }
2671
2672 /* Everything went well. */
2673 return 0;
5b4a0ec0
DG
2674
2675error:
d0b96690 2676 delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app);
094d1690 2677error_alloc:
4d710ac2 2678 return ret;
5b4a0ec0
DG
2679}
2680
2681/*
2682 * Create UST app event and create it on the tracer side.
d0b96690
DG
2683 *
2684 * Called with ust app session mutex held.
5b4a0ec0 2685 */
edb67388
DG
2686static
2687int create_ust_app_event(struct ust_app_session *ua_sess,
2688 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
2689 struct ust_app *app)
284d8f55 2690{
edb67388 2691 int ret = 0;
5b4a0ec0 2692 struct ust_app_event *ua_event;
284d8f55 2693
5b4a0ec0 2694 /* Get event node */
18eace3b 2695 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
39c5a3a7 2696 uevent->filter, uevent->attr.loglevel, uevent->exclusion);
18eace3b 2697 if (ua_event != NULL) {
fc34caaa 2698 ret = -EEXIST;
edb67388
DG
2699 goto end;
2700 }
5b4a0ec0 2701
edb67388
DG
2702 /* Does not exist so create one */
2703 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
2704 if (ua_event == NULL) {
2705 /* Only malloc can failed so something is really wrong */
2706 ret = -ENOMEM;
fc34caaa 2707 goto end;
5b4a0ec0 2708 }
edb67388 2709 shadow_copy_event(ua_event, uevent);
5b4a0ec0 2710
edb67388 2711 /* Create it on the tracer side */
5b4a0ec0 2712 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 2713 if (ret < 0) {
fc34caaa 2714 /* Not found previously means that it does not exist on the tracer */
76f66f63 2715 assert(ret != -LTTNG_UST_ERR_EXIST);
284d8f55
DG
2716 goto error;
2717 }
2718
d0b96690 2719 add_unique_ust_app_event(ua_chan, ua_event);
284d8f55 2720
fc34caaa 2721 DBG2("UST app create event %s for PID %d completed", ua_event->name,
852d0037 2722 app->pid);
7f79d3a1 2723
edb67388 2724end:
fc34caaa
DG
2725 return ret;
2726
5b4a0ec0 2727error:
fc34caaa
DG
2728 /* Valid. Calling here is already in a read side lock */
2729 delete_ust_app_event(-1, ua_event);
edb67388 2730 return ret;
5b4a0ec0
DG
2731}
2732
2733/*
2734 * Create UST metadata and open it on the tracer side.
d0b96690 2735 *
7972aab2 2736 * Called with UST app session lock held and RCU read side lock.
5b4a0ec0
DG
2737 */
2738static int create_ust_app_metadata(struct ust_app_session *ua_sess,
ad7a9107 2739 struct ust_app *app, struct consumer_output *consumer)
5b4a0ec0
DG
2740{
2741 int ret = 0;
ffe60014 2742 struct ust_app_channel *metadata;
d88aee68 2743 struct consumer_socket *socket;
7972aab2 2744 struct ust_registry_session *registry;
5b4a0ec0 2745
ffe60014
DG
2746 assert(ua_sess);
2747 assert(app);
d88aee68 2748 assert(consumer);
5b4a0ec0 2749
7972aab2
DG
2750 registry = get_session_registry(ua_sess);
2751 assert(registry);
2752
1b532a60
DG
2753 /* Metadata already exists for this registry or it was closed previously */
2754 if (registry->metadata_key || registry->metadata_closed) {
7972aab2
DG
2755 ret = 0;
2756 goto error;
5b4a0ec0
DG
2757 }
2758
ffe60014 2759 /* Allocate UST metadata */
d0b96690 2760 metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL);
ffe60014
DG
2761 if (!metadata) {
2762 /* malloc() failed */
2763 ret = -ENOMEM;
2764 goto error;
2765 }
5b4a0ec0 2766
ad7a9107 2767 memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr));
5b4a0ec0 2768
7972aab2
DG
2769 /* Need one fd for the channel. */
2770 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2771 if (ret < 0) {
2772 ERR("Exhausted number of available FD upon create metadata");
2773 goto error;
2774 }
2775
4dc3dfc5
DG
2776 /* Get the right consumer socket for the application. */
2777 socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer);
2778 if (!socket) {
2779 ret = -EINVAL;
2780 goto error_consumer;
2781 }
2782
331744e3
JD
2783 /*
2784 * Keep metadata key so we can identify it on the consumer side. Assign it
2785 * to the registry *before* we ask the consumer so we avoid the race of the
2786 * consumer requesting the metadata and the ask_channel call on our side
2787 * did not returned yet.
2788 */
2789 registry->metadata_key = metadata->key;
2790
d88aee68
DG
2791 /*
2792 * Ask the metadata channel creation to the consumer. The metadata object
2793 * will be created by the consumer and kept their. However, the stream is
2794 * never added or monitored until we do a first push metadata to the
2795 * consumer.
2796 */
7972aab2
DG
2797 ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket,
2798 registry);
d88aee68 2799 if (ret < 0) {
f2a444f1
DG
2800 /* Nullify the metadata key so we don't try to close it later on. */
2801 registry->metadata_key = 0;
d88aee68
DG
2802 goto error_consumer;
2803 }
2804
2805 /*
2806 * The setup command will make the metadata stream be sent to the relayd,
2807 * if applicable, and the thread managing the metadatas. This is important
2808 * because after this point, if an error occurs, the only way the stream
2809 * can be deleted is to be monitored in the consumer.
2810 */
7972aab2 2811 ret = consumer_setup_metadata(socket, metadata->key);
ffe60014 2812 if (ret < 0) {
f2a444f1
DG
2813 /* Nullify the metadata key so we don't try to close it later on. */
2814 registry->metadata_key = 0;
d88aee68 2815 goto error_consumer;
5b4a0ec0
DG
2816 }
2817
7972aab2
DG
2818 DBG2("UST metadata with key %" PRIu64 " created for app pid %d",
2819 metadata->key, app->pid);
5b4a0ec0 2820
d88aee68 2821error_consumer:
b80f0b6c 2822 lttng_fd_put(LTTNG_FD_APPS, 1);
d88aee68 2823 delete_ust_app_channel(-1, metadata, app);
5b4a0ec0 2824error:
ffe60014 2825 return ret;
5b4a0ec0
DG
2826}
2827
5b4a0ec0 2828/*
d88aee68
DG
2829 * Return ust app pointer or NULL if not found. RCU read side lock MUST be
2830 * acquired before calling this function.
5b4a0ec0
DG
2831 */
2832struct ust_app *ust_app_find_by_pid(pid_t pid)
2833{
d88aee68 2834 struct ust_app *app = NULL;
bec39940
DG
2835 struct lttng_ht_node_ulong *node;
2836 struct lttng_ht_iter iter;
5b4a0ec0 2837
bec39940
DG
2838 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
2839 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
2840 if (node == NULL) {
2841 DBG2("UST app no found with pid %d", pid);
2842 goto error;
2843 }
5b4a0ec0
DG
2844
2845 DBG2("Found UST app by pid %d", pid);
2846
d88aee68 2847 app = caa_container_of(node, struct ust_app, pid_n);
5b4a0ec0
DG
2848
2849error:
d88aee68 2850 return app;
5b4a0ec0
DG
2851}
2852
d88aee68
DG
2853/*
2854 * Allocate and init an UST app object using the registration information and
2855 * the command socket. This is called when the command socket connects to the
2856 * session daemon.
2857 *
2858 * The object is returned on success or else NULL.
2859 */
d0b96690 2860struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock)
5b4a0ec0 2861{
d0b96690
DG
2862 struct ust_app *lta = NULL;
2863
2864 assert(msg);
2865 assert(sock >= 0);
2866
2867 DBG3("UST app creating application for socket %d", sock);
5b4a0ec0 2868
173af62f
DG
2869 if ((msg->bits_per_long == 64 &&
2870 (uatomic_read(&ust_consumerd64_fd) == -EINVAL))
2871 || (msg->bits_per_long == 32 &&
2872 (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) {
f943b0fb 2873 ERR("Registration failed: application \"%s\" (pid: %d) has "
d0b96690
DG
2874 "%d-bit long, but no consumerd for this size is available.\n",
2875 msg->name, msg->pid, msg->bits_per_long);
2876 goto error;
3f2c5fcc 2877 }
d0b96690 2878
5b4a0ec0
DG
2879 lta = zmalloc(sizeof(struct ust_app));
2880 if (lta == NULL) {
2881 PERROR("malloc");
d0b96690 2882 goto error;
5b4a0ec0
DG
2883 }
2884
2885 lta->ppid = msg->ppid;
2886 lta->uid = msg->uid;
2887 lta->gid = msg->gid;
d0b96690 2888
7753dea8 2889 lta->bits_per_long = msg->bits_per_long;
d0b96690
DG
2890 lta->uint8_t_alignment = msg->uint8_t_alignment;
2891 lta->uint16_t_alignment = msg->uint16_t_alignment;
2892 lta->uint32_t_alignment = msg->uint32_t_alignment;
2893 lta->uint64_t_alignment = msg->uint64_t_alignment;
2894 lta->long_alignment = msg->long_alignment;
2895 lta->byte_order = msg->byte_order;
2896
5b4a0ec0
DG
2897 lta->v_major = msg->major;
2898 lta->v_minor = msg->minor;
d9bf3ca4 2899 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
d0b96690
DG
2900 lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
2901 lta->notify_sock = -1;
d88aee68
DG
2902
2903 /* Copy name and make sure it's NULL terminated. */
2904 strncpy(lta->name, msg->name, sizeof(lta->name));
2905 lta->name[UST_APP_PROCNAME_LEN] = '\0';
2906
2907 /*
2908 * Before this can be called, when receiving the registration information,
2909 * the application compatibility is checked. So, at this point, the
2910 * application can work with this session daemon.
2911 */
d0b96690 2912 lta->compatible = 1;
5b4a0ec0 2913
852d0037 2914 lta->pid = msg->pid;
d0b96690 2915 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long) lta->pid);
852d0037 2916 lta->sock = sock;
d0b96690 2917 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long) lta->sock);
5b4a0ec0 2918
d42f20df
DG
2919 CDS_INIT_LIST_HEAD(&lta->teardown_head);
2920
d0b96690
DG
2921error:
2922 return lta;
2923}
2924
d88aee68
DG
2925/*
2926 * For a given application object, add it to every hash table.
2927 */
d0b96690
DG
2928void ust_app_add(struct ust_app *app)
2929{
2930 assert(app);
2931 assert(app->notify_sock >= 0);
2932
5b4a0ec0 2933 rcu_read_lock();
852d0037
DG
2934
2935 /*
2936 * On a re-registration, we want to kick out the previous registration of
2937 * that pid
2938 */
d0b96690 2939 lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n);
852d0037
DG
2940
2941 /*
2942 * The socket _should_ be unique until _we_ call close. So, a add_unique
2943 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
2944 * already in the table.
2945 */
d0b96690 2946 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n);
852d0037 2947
d0b96690
DG
2948 /* Add application to the notify socket hash table. */
2949 lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock);
2950 lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n);
5b4a0ec0 2951
d0b96690 2952 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s "
d88aee68
DG
2953 "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid,
2954 app->gid, app->sock, app->name, app->notify_sock, app->v_major,
2955 app->v_minor);
5b4a0ec0 2956
d0b96690
DG
2957 rcu_read_unlock();
2958}
2959
d88aee68
DG
2960/*
2961 * Set the application version into the object.
2962 *
2963 * Return 0 on success else a negative value either an errno code or a
2964 * LTTng-UST error code.
2965 */
d0b96690
DG
2966int ust_app_version(struct ust_app *app)
2967{
d88aee68
DG
2968 int ret;
2969
d0b96690 2970 assert(app);
d88aee68
DG
2971
2972 ret = ustctl_tracer_version(app->sock, &app->version);
2973 if (ret < 0) {
2974 if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
5368d366 2975 ERR("UST app %d version failed with ret %d", app->sock, ret);
d88aee68 2976 } else {
5368d366 2977 DBG3("UST app %d version failed. Application is dead", app->sock);
d88aee68
DG
2978 }
2979 }
2980
2981 return ret;
5b4a0ec0
DG
2982}
2983
2984/*
2985 * Unregister app by removing it from the global traceable app list and freeing
2986 * the data struct.
2987 *
2988 * The socket is already closed at this point so no close to sock.
2989 */
2990void ust_app_unregister(int sock)
2991{
2992 struct ust_app *lta;
bec39940
DG
2993 struct lttng_ht_node_ulong *node;
2994 struct lttng_ht_iter iter;
d42f20df 2995 struct ust_app_session *ua_sess;
525b0740 2996 int ret;
5b4a0ec0
DG
2997
2998 rcu_read_lock();
886459c6 2999
5b4a0ec0 3000 /* Get the node reference for a call_rcu */
852d0037 3001 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 3002 node = lttng_ht_iter_get_node_ulong(&iter);
d0b96690 3003 assert(node);
284d8f55 3004
852d0037 3005 lta = caa_container_of(node, struct ust_app, sock_n);
852d0037
DG
3006 DBG("PID %d unregistering with sock %d", lta->pid, sock);
3007
886459c6 3008 /* Remove application from PID hash table */
852d0037
DG
3009 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
3010 assert(!ret);
3011
d88aee68
DG
3012 /*
3013 * Remove application from notify hash table. The thread handling the
3014 * notify socket could have deleted the node so ignore on error because
3015 * either way it's valid. The close of that socket is handled by the other
3016 * thread.
3017 */
d0b96690 3018 iter.iter.node = &lta->notify_sock_n.node;
d88aee68 3019 (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
852d0037 3020
5b98a774
DG
3021 /*
3022 * Ignore return value since the node might have been removed before by an
3023 * add replace during app registration because the PID can be reassigned by
3024 * the OS.
3025 */
d0b96690 3026 iter.iter.node = &lta->pid_n.node;
bec39940 3027 ret = lttng_ht_del(ust_app_ht, &iter);
5b98a774
DG
3028 if (ret) {
3029 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
3030 lta->pid);
3031 }
852d0037 3032
d42f20df
DG
3033 /* Remove sessions so they are not visible during deletion.*/
3034 cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess,
3035 node.node) {
7972aab2
DG
3036 struct ust_registry_session *registry;
3037
d42f20df
DG
3038 ret = lttng_ht_del(lta->sessions, &iter);
3039 if (ret) {
3040 /* The session was already removed so scheduled for teardown. */
3041 continue;
3042 }
3043
3044 /*
3045 * Add session to list for teardown. This is safe since at this point we
3046 * are the only one using this list.
3047 */
d88aee68
DG
3048 pthread_mutex_lock(&ua_sess->lock);
3049
3050 /*
3051 * Normally, this is done in the delete session process which is
3052 * executed in the call rcu below. However, upon registration we can't
3053 * afford to wait for the grace period before pushing data or else the
3054 * data pending feature can race between the unregistration and stop
3055 * command where the data pending command is sent *before* the grace
3056 * period ended.
3057 *
3058 * The close metadata below nullifies the metadata pointer in the
3059 * session so the delete session will NOT push/close a second time.
3060 */
7972aab2 3061 registry = get_session_registry(ua_sess);
1b532a60 3062 if (registry && !registry->metadata_closed) {
7972aab2
DG
3063 /* Push metadata for application before freeing the application. */
3064 (void) push_metadata(registry, ua_sess->consumer);
3065
3066 /*
3067 * Don't ask to close metadata for global per UID buffers. Close
1b532a60
DG
3068 * metadata only on destroy trace session in this case. Also, the
3069 * previous push metadata could have flag the metadata registry to
3070 * close so don't send a close command if closed.
7972aab2 3071 */
1b532a60
DG
3072 if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID &&
3073 !registry->metadata_closed) {
7972aab2
DG
3074 /* And ask to close it for this session registry. */
3075 (void) close_metadata(registry, ua_sess->consumer);
3076 }
3077 }
d88aee68 3078
d42f20df 3079 cds_list_add(&ua_sess->teardown_node, &lta->teardown_head);
d88aee68 3080 pthread_mutex_unlock(&ua_sess->lock);
d42f20df
DG
3081 }
3082
852d0037
DG
3083 /* Free memory */
3084 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
3085
5b4a0ec0
DG
3086 rcu_read_unlock();
3087 return;
284d8f55
DG
3088}
3089
5b4a0ec0
DG
3090/*
3091 * Fill events array with all events name of all registered apps.
3092 */
3093int ust_app_list_events(struct lttng_event **events)
421cb601 3094{
5b4a0ec0
DG
3095 int ret, handle;
3096 size_t nbmem, count = 0;
bec39940 3097 struct lttng_ht_iter iter;
5b4a0ec0 3098 struct ust_app *app;
c617c0c6 3099 struct lttng_event *tmp_event;
421cb601 3100
5b4a0ec0 3101 nbmem = UST_APP_EVENT_LIST_SIZE;
c617c0c6
MD
3102 tmp_event = zmalloc(nbmem * sizeof(struct lttng_event));
3103 if (tmp_event == NULL) {
5b4a0ec0
DG
3104 PERROR("zmalloc ust app events");
3105 ret = -ENOMEM;
421cb601
DG
3106 goto error;
3107 }
3108
5b4a0ec0 3109 rcu_read_lock();
421cb601 3110
852d0037 3111 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
90eaa0d2 3112 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 3113
840cb59c 3114 health_code_update();
86acf0da 3115
e0c7ec2b
DG
3116 if (!app->compatible) {
3117 /*
3118 * TODO: In time, we should notice the caller of this error by
3119 * telling him that this is a version error.
3120 */
3121 continue;
3122 }
852d0037 3123 handle = ustctl_tracepoint_list(app->sock);
5b4a0ec0 3124 if (handle < 0) {
ffe60014
DG
3125 if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) {
3126 ERR("UST app list events getting handle failed for app pid %d",
3127 app->pid);
3128 }
5b4a0ec0
DG
3129 continue;
3130 }
421cb601 3131
852d0037 3132 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
fb54cdbf 3133 &uiter)) != -LTTNG_UST_ERR_NOENT) {
ffe60014
DG
3134 /* Handle ustctl error. */
3135 if (ret < 0) {
a2ba1ab0 3136 if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
ffe60014
DG
3137 ERR("UST app tp list get failed for app %d with ret %d",
3138 app->sock, ret);
3139 } else {
3140 DBG3("UST app tp list get failed. Application is dead");
3757b385
DG
3141 /*
3142 * This is normal behavior, an application can die during the
3143 * creation process. Don't report an error so the execution can
3144 * continue normally. Continue normal execution.
3145 */
3146 break;
ffe60014 3147 }
98f595d4 3148 free(tmp_event);
ffe60014
DG
3149 goto rcu_error;
3150 }
3151
840cb59c 3152 health_code_update();
815564d8 3153 if (count >= nbmem) {
d7b3776f 3154 /* In case the realloc fails, we free the memory */
53efb85a
MD
3155 struct lttng_event *new_tmp_event;
3156 size_t new_nbmem;
3157
3158 new_nbmem = nbmem << 1;
3159 DBG2("Reallocating event list from %zu to %zu entries",
3160 nbmem, new_nbmem);
3161 new_tmp_event = realloc(tmp_event,
3162 new_nbmem * sizeof(struct lttng_event));
3163 if (new_tmp_event == NULL) {
5b4a0ec0 3164 PERROR("realloc ust app events");
c617c0c6 3165 free(tmp_event);
5b4a0ec0
DG
3166 ret = -ENOMEM;
3167 goto rcu_error;
3168 }
53efb85a
MD
3169 /* Zero the new memory */
3170 memset(new_tmp_event + nbmem, 0,
3171 (new_nbmem - nbmem) * sizeof(struct lttng_event));
3172 nbmem = new_nbmem;
3173 tmp_event = new_tmp_event;
5b4a0ec0 3174 }
c617c0c6
MD
3175 memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
3176 tmp_event[count].loglevel = uiter.loglevel;
3177 tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
3178 tmp_event[count].pid = app->pid;
3179 tmp_event[count].enabled = -1;
5b4a0ec0 3180 count++;
421cb601 3181 }
421cb601
DG
3182 }
3183
5b4a0ec0 3184 ret = count;
c617c0c6 3185 *events = tmp_event;
421cb601 3186
5b4a0ec0 3187 DBG2("UST app list events done (%zu events)", count);
421cb601 3188
5b4a0ec0
DG
3189rcu_error:
3190 rcu_read_unlock();
421cb601 3191error:
840cb59c 3192 health_code_update();
5b4a0ec0 3193 return ret;
421cb601
DG
3194}
3195
f37d259d
MD
3196/*
3197 * Fill events array with all events name of all registered apps.
3198 */
3199int ust_app_list_event_fields(struct lttng_event_field **fields)
3200{
3201 int ret, handle;
3202 size_t nbmem, count = 0;
3203 struct lttng_ht_iter iter;
3204 struct ust_app *app;
c617c0c6 3205 struct lttng_event_field *tmp_event;
f37d259d
MD
3206
3207 nbmem = UST_APP_EVENT_LIST_SIZE;
c617c0c6
MD
3208 tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field));
3209 if (tmp_event == NULL) {
f37d259d
MD
3210 PERROR("zmalloc ust app event fields");
3211 ret = -ENOMEM;
3212 goto error;
3213 }
3214
3215 rcu_read_lock();
3216
3217 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
3218 struct lttng_ust_field_iter uiter;
3219
840cb59c 3220 health_code_update();
86acf0da 3221
f37d259d
MD
3222 if (!app->compatible) {
3223 /*
3224 * TODO: In time, we should notice the caller of this error by
3225 * telling him that this is a version error.
3226 */
3227 continue;
3228 }
3229 handle = ustctl_tracepoint_field_list(app->sock);
3230 if (handle < 0) {
ffe60014
DG
3231 if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) {
3232 ERR("UST app list field getting handle failed for app pid %d",
3233 app->pid);
3234 }
f37d259d
MD
3235 continue;
3236 }
3237
3238 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
fb54cdbf 3239 &uiter)) != -LTTNG_UST_ERR_NOENT) {
ffe60014
DG
3240 /* Handle ustctl error. */
3241 if (ret < 0) {
a2ba1ab0 3242 if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
ffe60014
DG
3243 ERR("UST app tp list field failed for app %d with ret %d",
3244 app->sock, ret);
3245 } else {
3246 DBG3("UST app tp list field failed. Application is dead");
3757b385
DG
3247 /*
3248 * This is normal behavior, an application can die during the
3249 * creation process. Don't report an error so the execution can
98f595d4 3250 * continue normally. Reset list and count for next app.
3757b385
DG
3251 */
3252 break;
ffe60014 3253 }
98f595d4 3254 free(tmp_event);
ffe60014
DG
3255 goto rcu_error;
3256 }
3257
840cb59c 3258 health_code_update();
f37d259d 3259 if (count >= nbmem) {
d7b3776f 3260 /* In case the realloc fails, we free the memory */
53efb85a
MD
3261 struct lttng_event_field *new_tmp_event;
3262 size_t new_nbmem;
3263
3264 new_nbmem = nbmem << 1;
3265 DBG2("Reallocating event field list from %zu to %zu entries",
3266 nbmem, new_nbmem);
3267 new_tmp_event = realloc(tmp_event,
3268 new_nbmem * sizeof(struct lttng_event_field));
3269 if (new_tmp_event == NULL) {
f37d259d 3270 PERROR("realloc ust app event fields");
c617c0c6 3271 free(tmp_event);
f37d259d
MD
3272 ret = -ENOMEM;
3273 goto rcu_error;
3274 }
53efb85a
MD
3275 /* Zero the new memory */
3276 memset(new_tmp_event + nbmem, 0,
3277 (new_nbmem - nbmem) * sizeof(struct lttng_event_field));
3278 nbmem = new_nbmem;
3279 tmp_event = new_tmp_event;
f37d259d 3280 }
f37d259d 3281
c617c0c6 3282 memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
2e84128e
DG
3283 /* Mapping between these enums matches 1 to 1. */
3284 tmp_event[count].type = (enum lttng_event_field_type) uiter.type;
c617c0c6