Fix: sessiond: rotation trigger leak
[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.cpp
CommitLineData
91d76f53 1/*
21cf9b6b 2 * Copyright (C) 2011 EfficiOS Inc.
ab5be9fa 3 * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
91d76f53 4 *
ab5be9fa 5 * SPDX-License-Identifier: GPL-2.0-only
91d76f53 6 *
91d76f53
DG
7 */
8
6c1c0768 9#define _LGPL_SOURCE
533a90fb
FD
10#include <errno.h>
11#include <fcntl.h>
7972aab2 12#include <inttypes.h>
91d76f53
DG
13#include <pthread.h>
14#include <stdio.h>
15#include <stdlib.h>
099e26bd 16#include <string.h>
533a90fb 17#include <sys/mman.h>
aba8e916
DG
18#include <sys/stat.h>
19#include <sys/types.h>
099e26bd 20#include <unistd.h>
0df502fd 21#include <urcu/compiler.h>
331744e3 22#include <signal.h>
bec39940 23
c9e313bc
SM
24#include <common/bytecode/bytecode.hpp>
25#include <common/compat/errno.hpp>
26#include <common/common.hpp>
27#include <common/hashtable/utils.hpp>
993578ff 28#include <lttng/event-rule/event-rule.h>
c9e313bc 29#include <lttng/event-rule/event-rule-internal.hpp>
695f7044 30#include <lttng/event-rule/user-tracepoint.h>
993578ff 31#include <lttng/condition/condition.h>
c9e313bc 32#include <lttng/condition/event-rule-matches-internal.hpp>
670a26e4 33#include <lttng/condition/event-rule-matches.h>
c9e313bc
SM
34#include <lttng/trigger/trigger-internal.hpp>
35#include <common/sessiond-comm/sessiond-comm.hpp>
1e307fab 36
c9e313bc
SM
37#include "buffer-registry.hpp"
38#include "condition-internal.hpp"
39#include "fd-limit.hpp"
40#include "health-sessiond.hpp"
41#include "ust-app.hpp"
42#include "ust-consumer.hpp"
43#include "lttng-ust-ctl.hpp"
44#include "lttng-ust-error.hpp"
45#include "utils.hpp"
46#include "session.hpp"
47#include "lttng-sessiond.hpp"
48#include "notification-thread-commands.hpp"
49#include "rotate.hpp"
50#include "event.hpp"
51#include "event-notifier-error-accounting.hpp"
52#include "ust-field-utils.hpp"
d80a6244 53
44cdb3a2
MJ
54struct lttng_ht *ust_app_ht;
55struct lttng_ht *ust_app_ht_by_sock;
56struct lttng_ht *ust_app_ht_by_notify_sock;
57
c4b88406
MD
58static
59int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess);
60
d9bf3ca4
MD
61/* Next available channel key. Access under next_channel_key_lock. */
62static uint64_t _next_channel_key;
63static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER;
64
65/* Next available session ID. Access under next_session_id_lock. */
66static uint64_t _next_session_id;
67static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER;
ffe60014
DG
68
69/*
d9bf3ca4 70 * Return the incremented value of next_channel_key.
ffe60014 71 */
d9bf3ca4 72static uint64_t get_next_channel_key(void)
ffe60014 73{
d9bf3ca4
MD
74 uint64_t ret;
75
76 pthread_mutex_lock(&next_channel_key_lock);
77 ret = ++_next_channel_key;
78 pthread_mutex_unlock(&next_channel_key_lock);
79 return ret;
ffe60014
DG
80}
81
82/*
7972aab2 83 * Return the atomically incremented value of next_session_id.
ffe60014 84 */
d9bf3ca4 85static uint64_t get_next_session_id(void)
ffe60014 86{
d9bf3ca4
MD
87 uint64_t ret;
88
89 pthread_mutex_lock(&next_session_id_lock);
90 ret = ++_next_session_id;
91 pthread_mutex_unlock(&next_session_id_lock);
92 return ret;
ffe60014
DG
93}
94
d65d2de8 95static void copy_channel_attr_to_ustctl(
b623cb6a 96 struct lttng_ust_ctl_consumer_channel_attr *attr,
fc4b93fa 97 struct lttng_ust_abi_channel_attr *uattr)
d65d2de8
DG
98{
99 /* Copy event attributes since the layout is different. */
100 attr->subbuf_size = uattr->subbuf_size;
101 attr->num_subbuf = uattr->num_subbuf;
102 attr->overwrite = uattr->overwrite;
103 attr->switch_timer_interval = uattr->switch_timer_interval;
104 attr->read_timer_interval = uattr->read_timer_interval;
7966af57 105 attr->output = (lttng_ust_abi_output) uattr->output;
491d1539 106 attr->blocking_timeout = uattr->u.s.blocking_timeout;
d65d2de8
DG
107}
108
025faf73
DG
109/*
110 * Match function for the hash table lookup.
111 *
112 * It matches an ust app event based on three attributes which are the event
113 * name, the filter bytecode and the loglevel.
114 */
18eace3b
DG
115static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key)
116{
117 struct ust_app_event *event;
118 const struct ust_app_ht_key *key;
2106efa0 119 int ev_loglevel_value;
18eace3b 120
a0377dfe
FD
121 LTTNG_ASSERT(node);
122 LTTNG_ASSERT(_key);
18eace3b
DG
123
124 event = caa_container_of(node, struct ust_app_event, node.node);
7966af57 125 key = (ust_app_ht_key *) _key;
2106efa0 126 ev_loglevel_value = event->attr.loglevel;
18eace3b 127
1af53eb5 128 /* Match the 4 elements of the key: name, filter, loglevel, exclusions */
18eace3b
DG
129
130 /* Event name */
131 if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
132 goto no_match;
133 }
134
135 /* Event loglevel. */
2106efa0 136 if (ev_loglevel_value != key->loglevel_type) {
fc4b93fa 137 if (event->attr.loglevel_type == LTTNG_UST_ABI_LOGLEVEL_ALL
2106efa0
PP
138 && key->loglevel_type == 0 &&
139 ev_loglevel_value == -1) {
025faf73
DG
140 /*
141 * Match is accepted. This is because on event creation, the
142 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
143 * -1 are accepted for this loglevel type since 0 is the one set by
144 * the API when receiving an enable event.
145 */
146 } else {
147 goto no_match;
148 }
18eace3b
DG
149 }
150
151 /* One of the filters is NULL, fail. */
152 if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
153 goto no_match;
154 }
155
025faf73
DG
156 if (key->filter && event->filter) {
157 /* Both filters exists, check length followed by the bytecode. */
158 if (event->filter->len != key->filter->len ||
159 memcmp(event->filter->data, key->filter->data,
160 event->filter->len) != 0) {
161 goto no_match;
162 }
18eace3b
DG
163 }
164
1af53eb5
JI
165 /* One of the exclusions is NULL, fail. */
166 if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) {
167 goto no_match;
168 }
169
170 if (key->exclusion && event->exclusion) {
171 /* Both exclusions exists, check count followed by the names. */
172 if (event->exclusion->count != key->exclusion->count ||
173 memcmp(event->exclusion->names, key->exclusion->names,
fc4b93fa 174 event->exclusion->count * LTTNG_UST_ABI_SYM_NAME_LEN) != 0) {
1af53eb5
JI
175 goto no_match;
176 }
177 }
178
179
025faf73 180 /* Match. */
18eace3b
DG
181 return 1;
182
183no_match:
184 return 0;
18eace3b
DG
185}
186
025faf73
DG
187/*
188 * Unique add of an ust app event in the given ht. This uses the custom
189 * ht_match_ust_app_event match function and the event name as hash.
190 */
d0b96690 191static void add_unique_ust_app_event(struct ust_app_channel *ua_chan,
18eace3b
DG
192 struct ust_app_event *event)
193{
194 struct cds_lfht_node *node_ptr;
195 struct ust_app_ht_key key;
d0b96690 196 struct lttng_ht *ht;
18eace3b 197
a0377dfe
FD
198 LTTNG_ASSERT(ua_chan);
199 LTTNG_ASSERT(ua_chan->events);
200 LTTNG_ASSERT(event);
18eace3b 201
d0b96690 202 ht = ua_chan->events;
18eace3b
DG
203 key.name = event->attr.name;
204 key.filter = event->filter;
7966af57 205 key.loglevel_type = (lttng_ust_abi_loglevel_type) event->attr.loglevel;
91c89f23 206 key.exclusion = event->exclusion;
18eace3b
DG
207
208 node_ptr = cds_lfht_add_unique(ht->ht,
209 ht->hash_fct(event->node.key, lttng_ht_seed),
210 ht_match_ust_app_event, &key, &event->node.node);
a0377dfe 211 LTTNG_ASSERT(node_ptr == &event->node.node);
18eace3b
DG
212}
213
d88aee68
DG
214/*
215 * Close the notify socket from the given RCU head object. This MUST be called
216 * through a call_rcu().
217 */
218static void close_notify_sock_rcu(struct rcu_head *head)
219{
220 int ret;
221 struct ust_app_notify_sock_obj *obj =
222 caa_container_of(head, struct ust_app_notify_sock_obj, head);
223
224 /* Must have a valid fd here. */
a0377dfe 225 LTTNG_ASSERT(obj->fd >= 0);
d88aee68
DG
226
227 ret = close(obj->fd);
228 if (ret) {
229 ERR("close notify sock %d RCU", obj->fd);
230 }
231 lttng_fd_put(LTTNG_FD_APPS, 1);
232
233 free(obj);
234}
235
7972aab2
DG
236/*
237 * Return the session registry according to the buffer type of the given
238 * session.
239 *
240 * A registry per UID object MUST exists before calling this function or else
a0377dfe 241 * it LTTNG_ASSERT() if not found. RCU read side lock must be acquired.
7972aab2
DG
242 */
243static struct ust_registry_session *get_session_registry(
244 struct ust_app_session *ua_sess)
245{
246 struct ust_registry_session *registry = NULL;
247
a0377dfe 248 LTTNG_ASSERT(ua_sess);
7972aab2
DG
249
250 switch (ua_sess->buffer_type) {
251 case LTTNG_BUFFER_PER_PID:
252 {
253 struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id);
254 if (!reg_pid) {
255 goto error;
256 }
257 registry = reg_pid->registry->reg.ust;
258 break;
259 }
260 case LTTNG_BUFFER_PER_UID:
261 {
262 struct buffer_reg_uid *reg_uid = buffer_reg_uid_find(
470cc211 263 ua_sess->tracing_id, ua_sess->bits_per_long,
ff588497 264 lttng_credentials_get_uid(&ua_sess->real_credentials));
7972aab2
DG
265 if (!reg_uid) {
266 goto error;
267 }
268 registry = reg_uid->registry->reg.ust;
269 break;
270 }
271 default:
a0377dfe 272 abort();
7972aab2
DG
273 };
274
275error:
276 return registry;
277}
278
55cc08a6
DG
279/*
280 * Delete ust context safely. RCU read lock must be held before calling
281 * this function.
282 */
283static
fb45065e
MD
284void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx,
285 struct ust_app *app)
55cc08a6 286{
ffe60014
DG
287 int ret;
288
a0377dfe 289 LTTNG_ASSERT(ua_ctx);
48b7cdc2 290 ASSERT_RCU_READ_LOCKED();
ffe60014 291
55cc08a6 292 if (ua_ctx->obj) {
fb45065e 293 pthread_mutex_lock(&app->sock_lock);
b623cb6a 294 ret = lttng_ust_ctl_release_object(sock, ua_ctx->obj);
fb45065e 295 pthread_mutex_unlock(&app->sock_lock);
be355079
JR
296 if (ret < 0) {
297 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
298 DBG3("UST app release ctx failed. Application is dead: pid = %d, sock = %d",
299 app->pid, app->sock);
300 } else if (ret == -EAGAIN) {
301 WARN("UST app release ctx failed. Communication time out: pid = %d, sock = %d",
302 app->pid, app->sock);
303 } else {
304 ERR("UST app release ctx obj handle %d failed with ret %d: pid = %d, sock = %d",
305 ua_ctx->obj->handle, ret,
306 app->pid, app->sock);
307 }
ffe60014 308 }
55cc08a6
DG
309 free(ua_ctx->obj);
310 }
311 free(ua_ctx);
312}
313
d80a6244
DG
314/*
315 * Delete ust app event safely. RCU read lock must be held before calling
316 * this function.
317 */
8b366481 318static
fb45065e
MD
319void delete_ust_app_event(int sock, struct ust_app_event *ua_event,
320 struct ust_app *app)
d80a6244 321{
ffe60014
DG
322 int ret;
323
a0377dfe 324 LTTNG_ASSERT(ua_event);
48b7cdc2 325 ASSERT_RCU_READ_LOCKED();
ffe60014 326
53a80697 327 free(ua_event->filter);
951f0b71
JI
328 if (ua_event->exclusion != NULL)
329 free(ua_event->exclusion);
edb67388 330 if (ua_event->obj != NULL) {
fb45065e 331 pthread_mutex_lock(&app->sock_lock);
b623cb6a 332 ret = lttng_ust_ctl_release_object(sock, ua_event->obj);
fb45065e 333 pthread_mutex_unlock(&app->sock_lock);
be355079
JR
334 if (ret < 0) {
335 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
336 DBG3("UST app release event failed. Application is dead: pid = %d, sock = %d",
337 app->pid, app->sock);
338 } else if (ret == -EAGAIN) {
339 WARN("UST app release event failed. Communication time out: pid = %d, sock = %d",
340 app->pid, app->sock);
341 } else {
342 ERR("UST app release event obj failed with ret %d: pid = %d, sock = %d",
343 ret, app->pid, app->sock);
344 }
ffe60014 345 }
edb67388
DG
346 free(ua_event->obj);
347 }
d80a6244
DG
348 free(ua_event);
349}
350
993578ff
JR
351/*
352 * Delayed reclaim of a ust_app_event_notifier_rule object. This MUST be called
353 * through a call_rcu().
354 */
355static
356void free_ust_app_event_notifier_rule_rcu(struct rcu_head *head)
357{
358 struct ust_app_event_notifier_rule *obj = caa_container_of(
359 head, struct ust_app_event_notifier_rule, rcu_head);
360
361 free(obj);
362}
363
364/*
365 * Delete ust app event notifier rule safely.
366 */
367static void delete_ust_app_event_notifier_rule(int sock,
368 struct ust_app_event_notifier_rule *ua_event_notifier_rule,
369 struct ust_app *app)
370{
371 int ret;
372
a0377dfe 373 LTTNG_ASSERT(ua_event_notifier_rule);
993578ff
JR
374
375 if (ua_event_notifier_rule->exclusion != NULL) {
376 free(ua_event_notifier_rule->exclusion);
377 }
378
379 if (ua_event_notifier_rule->obj != NULL) {
380 pthread_mutex_lock(&app->sock_lock);
b623cb6a 381 ret = lttng_ust_ctl_release_object(sock, ua_event_notifier_rule->obj);
993578ff 382 pthread_mutex_unlock(&app->sock_lock);
be355079
JR
383 if (ret < 0) {
384 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
385 DBG3("UST app release event notifier failed. Application is dead: pid = %d, sock = %d",
386 app->pid, app->sock);
387 } else if (ret == -EAGAIN) {
388 WARN("UST app release event notifier failed. Communication time out: pid = %d, sock = %d",
389 app->pid, app->sock);
390 } else {
391 ERR("UST app release event notifier failed with ret %d: pid = %d, sock = %d",
392 ret, app->pid, app->sock);
393 }
993578ff
JR
394 }
395
396 free(ua_event_notifier_rule->obj);
397 }
398
267d66aa 399 lttng_trigger_put(ua_event_notifier_rule->trigger);
993578ff
JR
400 call_rcu(&ua_event_notifier_rule->rcu_head,
401 free_ust_app_event_notifier_rule_rcu);
402}
403
d80a6244 404/*
7972aab2
DG
405 * Release ust data object of the given stream.
406 *
407 * Return 0 on success or else a negative value.
d80a6244 408 */
fb45065e
MD
409static int release_ust_app_stream(int sock, struct ust_app_stream *stream,
410 struct ust_app *app)
d80a6244 411{
7972aab2 412 int ret = 0;
ffe60014 413
a0377dfe 414 LTTNG_ASSERT(stream);
ffe60014 415
8b366481 416 if (stream->obj) {
fb45065e 417 pthread_mutex_lock(&app->sock_lock);
b623cb6a 418 ret = lttng_ust_ctl_release_object(sock, stream->obj);
fb45065e 419 pthread_mutex_unlock(&app->sock_lock);
be355079
JR
420 if (ret < 0) {
421 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
422 DBG3("UST app release stream failed. Application is dead: pid = %d, sock = %d",
423 app->pid, app->sock);
424 } else if (ret == -EAGAIN) {
425 WARN("UST app release stream failed. Communication time out: pid = %d, sock = %d",
426 app->pid, app->sock);
427 } else {
428 ERR("UST app release stream obj failed with ret %d: pid = %d, sock = %d",
429 ret, app->pid, app->sock);
430 }
ffe60014 431 }
4063050c 432 lttng_fd_put(LTTNG_FD_APPS, 2);
8b366481
DG
433 free(stream->obj);
434 }
7972aab2
DG
435
436 return ret;
437}
438
439/*
440 * Delete ust app stream safely. RCU read lock must be held before calling
441 * this function.
442 */
443static
fb45065e
MD
444void delete_ust_app_stream(int sock, struct ust_app_stream *stream,
445 struct ust_app *app)
7972aab2 446{
a0377dfe 447 LTTNG_ASSERT(stream);
48b7cdc2 448 ASSERT_RCU_READ_LOCKED();
7972aab2 449
fb45065e 450 (void) release_ust_app_stream(sock, stream, app);
84cd17c6 451 free(stream);
d80a6244
DG
452}
453
36b588ed
MD
454static
455void delete_ust_app_channel_rcu(struct rcu_head *head)
456{
457 struct ust_app_channel *ua_chan =
458 caa_container_of(head, struct ust_app_channel, rcu_head);
459
3c339053
FD
460 lttng_ht_destroy(ua_chan->ctx);
461 lttng_ht_destroy(ua_chan->events);
36b588ed
MD
462 free(ua_chan);
463}
464
fb83fe64
JD
465/*
466 * Extract the lost packet or discarded events counter when the channel is
467 * being deleted and store the value in the parent channel so we can
468 * access it from lttng list and at stop/destroy.
82cac6d2
JG
469 *
470 * The session list lock must be held by the caller.
fb83fe64
JD
471 */
472static
473void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan)
474{
475 uint64_t discarded = 0, lost = 0;
476 struct ltt_session *session;
477 struct ltt_ust_channel *uchan;
478
fc4b93fa 479 if (ua_chan->attr.type != LTTNG_UST_ABI_CHAN_PER_CPU) {
fb83fe64
JD
480 return;
481 }
482
483 rcu_read_lock();
484 session = session_find_by_id(ua_chan->session->tracing_id);
d68ec974
JG
485 if (!session || !session->ust_session) {
486 /*
487 * Not finding the session is not an error because there are
488 * multiple ways the channels can be torn down.
489 *
490 * 1) The session daemon can initiate the destruction of the
491 * ust app session after receiving a destroy command or
492 * during its shutdown/teardown.
493 * 2) The application, since we are in per-pid tracing, is
494 * unregistering and tearing down its ust app session.
495 *
496 * Both paths are protected by the session list lock which
497 * ensures that the accounting of lost packets and discarded
498 * events is done exactly once. The session is then unpublished
499 * from the session list, resulting in this condition.
500 */
fb83fe64
JD
501 goto end;
502 }
503
504 if (ua_chan->attr.overwrite) {
505 consumer_get_lost_packets(ua_chan->session->tracing_id,
506 ua_chan->key, session->ust_session->consumer,
507 &lost);
508 } else {
509 consumer_get_discarded_events(ua_chan->session->tracing_id,
510 ua_chan->key, session->ust_session->consumer,
511 &discarded);
512 }
513 uchan = trace_ust_find_channel_by_name(
514 session->ust_session->domain_global.channels,
515 ua_chan->name);
516 if (!uchan) {
517 ERR("Missing UST channel to store discarded counters");
518 goto end;
519 }
520
521 uchan->per_pid_closed_app_discarded += discarded;
522 uchan->per_pid_closed_app_lost += lost;
523
524end:
525 rcu_read_unlock();
e32d7f27
JG
526 if (session) {
527 session_put(session);
528 }
fb83fe64
JD
529}
530
d80a6244
DG
531/*
532 * Delete ust app channel safely. RCU read lock must be held before calling
533 * this function.
82cac6d2
JG
534 *
535 * The session list lock must be held by the caller.
d80a6244 536 */
8b366481 537static
d0b96690
DG
538void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan,
539 struct ust_app *app)
d80a6244
DG
540{
541 int ret;
bec39940 542 struct lttng_ht_iter iter;
d80a6244 543 struct ust_app_event *ua_event;
55cc08a6 544 struct ust_app_ctx *ua_ctx;
030a66fa 545 struct ust_app_stream *stream, *stmp;
7972aab2 546 struct ust_registry_session *registry;
d80a6244 547
a0377dfe 548 LTTNG_ASSERT(ua_chan);
48b7cdc2 549 ASSERT_RCU_READ_LOCKED();
ffe60014
DG
550
551 DBG3("UST app deleting channel %s", ua_chan->name);
552
55cc08a6 553 /* Wipe stream */
d80a6244 554 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
84cd17c6 555 cds_list_del(&stream->list);
fb45065e 556 delete_ust_app_stream(sock, stream, app);
d80a6244
DG
557 }
558
55cc08a6 559 /* Wipe context */
bec39940 560 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
31746f93 561 cds_list_del(&ua_ctx->list);
bec39940 562 ret = lttng_ht_del(ua_chan->ctx, &iter);
a0377dfe 563 LTTNG_ASSERT(!ret);
fb45065e 564 delete_ust_app_ctx(sock, ua_ctx, app);
55cc08a6 565 }
d80a6244 566
55cc08a6 567 /* Wipe events */
bec39940
DG
568 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
569 node.node) {
570 ret = lttng_ht_del(ua_chan->events, &iter);
a0377dfe 571 LTTNG_ASSERT(!ret);
fb45065e 572 delete_ust_app_event(sock, ua_event, app);
d80a6244 573 }
edb67388 574
c8335706
MD
575 if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) {
576 /* Wipe and free registry from session registry. */
577 registry = get_session_registry(ua_chan->session);
578 if (registry) {
e9404c27 579 ust_registry_channel_del_free(registry, ua_chan->key,
e38d96f9
MD
580 sock >= 0);
581 }
45798a31
JG
582 /*
583 * A negative socket can be used by the caller when
584 * cleaning-up a ua_chan in an error path. Skip the
585 * accounting in this case.
586 */
e38d96f9
MD
587 if (sock >= 0) {
588 save_per_pid_lost_discarded_counters(ua_chan);
c8335706 589 }
7972aab2 590 }
d0b96690 591
edb67388 592 if (ua_chan->obj != NULL) {
d0b96690
DG
593 /* Remove channel from application UST object descriptor. */
594 iter.iter.node = &ua_chan->ust_objd_node.node;
c6e62271 595 ret = lttng_ht_del(app->ust_objd, &iter);
a0377dfe 596 LTTNG_ASSERT(!ret);
fb45065e 597 pthread_mutex_lock(&app->sock_lock);
b623cb6a 598 ret = lttng_ust_ctl_release_object(sock, ua_chan->obj);
fb45065e 599 pthread_mutex_unlock(&app->sock_lock);
be355079
JR
600 if (ret < 0) {
601 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
602 DBG3("UST app channel %s release failed. Application is dead: pid = %d, sock = %d",
603 ua_chan->name, app->pid,
604 app->sock);
605 } else if (ret == -EAGAIN) {
606 WARN("UST app channel %s release failed. Communication time out: pid = %d, sock = %d",
607 ua_chan->name, app->pid,
608 app->sock);
609 } else {
610 ERR("UST app channel %s release failed with ret %d: pid = %d, sock = %d",
611 ua_chan->name, ret, app->pid,
612 app->sock);
613 }
ffe60014 614 }
7972aab2 615 lttng_fd_put(LTTNG_FD_APPS, 1);
edb67388
DG
616 free(ua_chan->obj);
617 }
36b588ed 618 call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu);
d80a6244
DG
619}
620
fb45065e
MD
621int ust_app_register_done(struct ust_app *app)
622{
623 int ret;
624
625 pthread_mutex_lock(&app->sock_lock);
b623cb6a 626 ret = lttng_ust_ctl_register_done(app->sock);
fb45065e
MD
627 pthread_mutex_unlock(&app->sock_lock);
628 return ret;
629}
630
fc4b93fa 631int ust_app_release_object(struct ust_app *app, struct lttng_ust_abi_object_data *data)
fb45065e
MD
632{
633 int ret, sock;
634
635 if (app) {
636 pthread_mutex_lock(&app->sock_lock);
637 sock = app->sock;
638 } else {
639 sock = -1;
640 }
b623cb6a 641 ret = lttng_ust_ctl_release_object(sock, data);
fb45065e
MD
642 if (app) {
643 pthread_mutex_unlock(&app->sock_lock);
644 }
645 return ret;
646}
647
331744e3 648/*
1b532a60
DG
649 * Push metadata to consumer socket.
650 *
0f1b1d25 651 * RCU read-side lock must be held to guarantee existence of socket.
dc2bbdae
MD
652 * Must be called with the ust app session lock held.
653 * Must be called with the registry lock held.
331744e3
JD
654 *
655 * On success, return the len of metadata pushed or else a negative value.
2c57e06d
MD
656 * Returning a -EPIPE return value means we could not send the metadata,
657 * but it can be caused by recoverable errors (e.g. the application has
658 * terminated concurrently).
331744e3
JD
659 */
660ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
661 struct consumer_socket *socket, int send_zero_data)
662{
663 int ret;
664 char *metadata_str = NULL;
c585821b 665 size_t len, offset, new_metadata_len_sent;
331744e3 666 ssize_t ret_val;
93ec662e 667 uint64_t metadata_key, metadata_version;
331744e3 668
a0377dfe
FD
669 LTTNG_ASSERT(registry);
670 LTTNG_ASSERT(socket);
48b7cdc2 671 ASSERT_RCU_READ_LOCKED();
1b532a60 672
c585821b
MD
673 metadata_key = registry->metadata_key;
674
ce34fcd0 675 /*
dc2bbdae
MD
676 * Means that no metadata was assigned to the session. This can
677 * happens if no start has been done previously.
ce34fcd0 678 */
c585821b 679 if (!metadata_key) {
ce34fcd0
MD
680 return 0;
681 }
682
331744e3
JD
683 offset = registry->metadata_len_sent;
684 len = registry->metadata_len - registry->metadata_len_sent;
c585821b 685 new_metadata_len_sent = registry->metadata_len;
93ec662e 686 metadata_version = registry->metadata_version;
331744e3
JD
687 if (len == 0) {
688 DBG3("No metadata to push for metadata key %" PRIu64,
689 registry->metadata_key);
690 ret_val = len;
691 if (send_zero_data) {
692 DBG("No metadata to push");
693 goto push_data;
694 }
695 goto end;
696 }
697
698 /* Allocate only what we have to send. */
64803277 699 metadata_str = calloc<char>(len);
331744e3
JD
700 if (!metadata_str) {
701 PERROR("zmalloc ust app metadata string");
702 ret_val = -ENOMEM;
703 goto error;
704 }
c585821b 705 /* Copy what we haven't sent out. */
331744e3 706 memcpy(metadata_str, registry->metadata + offset, len);
331744e3
JD
707
708push_data:
c585821b
MD
709 pthread_mutex_unlock(&registry->lock);
710 /*
711 * We need to unlock the registry while we push metadata to
712 * break a circular dependency between the consumerd metadata
713 * lock and the sessiond registry lock. Indeed, pushing metadata
714 * to the consumerd awaits that it gets pushed all the way to
715 * relayd, but doing so requires grabbing the metadata lock. If
716 * a concurrent metadata request is being performed by
717 * consumerd, this can try to grab the registry lock on the
718 * sessiond while holding the metadata lock on the consumer
719 * daemon. Those push and pull schemes are performed on two
720 * different bidirectionnal communication sockets.
721 */
722 ret = consumer_push_metadata(socket, metadata_key,
93ec662e 723 metadata_str, len, offset, metadata_version);
c585821b 724 pthread_mutex_lock(&registry->lock);
331744e3 725 if (ret < 0) {
000baf6a 726 /*
dc2bbdae
MD
727 * There is an acceptable race here between the registry
728 * metadata key assignment and the creation on the
729 * consumer. The session daemon can concurrently push
730 * metadata for this registry while being created on the
731 * consumer since the metadata key of the registry is
732 * assigned *before* it is setup to avoid the consumer
733 * to ask for metadata that could possibly be not found
734 * in the session daemon.
000baf6a 735 *
dc2bbdae
MD
736 * The metadata will get pushed either by the session
737 * being stopped or the consumer requesting metadata if
738 * that race is triggered.
000baf6a
DG
739 */
740 if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) {
741 ret = 0;
c585821b
MD
742 } else {
743 ERR("Error pushing metadata to consumer");
000baf6a 744 }
331744e3
JD
745 ret_val = ret;
746 goto error_push;
c585821b
MD
747 } else {
748 /*
749 * Metadata may have been concurrently pushed, since
750 * we're not holding the registry lock while pushing to
751 * consumer. This is handled by the fact that we send
752 * the metadata content, size, and the offset at which
753 * that metadata belongs. This may arrive out of order
754 * on the consumer side, and the consumer is able to
755 * deal with overlapping fragments. The consumer
756 * supports overlapping fragments, which must be
757 * contiguous starting from offset 0. We keep the
758 * largest metadata_len_sent value of the concurrent
759 * send.
760 */
761 registry->metadata_len_sent =
7966af57 762 std::max(registry->metadata_len_sent,
c585821b 763 new_metadata_len_sent);
331744e3 764 }
331744e3
JD
765 free(metadata_str);
766 return len;
767
768end:
769error:
ce34fcd0
MD
770 if (ret_val) {
771 /*
dc2bbdae
MD
772 * On error, flag the registry that the metadata is
773 * closed. We were unable to push anything and this
774 * means that either the consumer is not responding or
775 * the metadata cache has been destroyed on the
776 * consumer.
ce34fcd0
MD
777 */
778 registry->metadata_closed = 1;
779 }
331744e3
JD
780error_push:
781 free(metadata_str);
782 return ret_val;
783}
784
d88aee68 785/*
ce34fcd0 786 * For a given application and session, push metadata to consumer.
331744e3
JD
787 * Either sock or consumer is required : if sock is NULL, the default
788 * socket to send the metadata is retrieved from consumer, if sock
789 * is not NULL we use it to send the metadata.
ce34fcd0 790 * RCU read-side lock must be held while calling this function,
0f1b1d25 791 * therefore ensuring existence of registry. It also ensures existence
dc2bbdae 792 * of socket throughout this function.
d88aee68
DG
793 *
794 * Return 0 on success else a negative error.
2c57e06d
MD
795 * Returning a -EPIPE return value means we could not send the metadata,
796 * but it can be caused by recoverable errors (e.g. the application has
797 * terminated concurrently).
d88aee68 798 */
7972aab2
DG
799static int push_metadata(struct ust_registry_session *registry,
800 struct consumer_output *consumer)
d88aee68 801{
331744e3
JD
802 int ret_val;
803 ssize_t ret;
d88aee68
DG
804 struct consumer_socket *socket;
805
a0377dfe
FD
806 LTTNG_ASSERT(registry);
807 LTTNG_ASSERT(consumer);
48b7cdc2 808 ASSERT_RCU_READ_LOCKED();
7972aab2 809
ce34fcd0 810 pthread_mutex_lock(&registry->lock);
ce34fcd0 811 if (registry->metadata_closed) {
dc2bbdae
MD
812 ret_val = -EPIPE;
813 goto error;
d88aee68
DG
814 }
815
d88aee68 816 /* Get consumer socket to use to push the metadata.*/
7972aab2
DG
817 socket = consumer_find_socket_by_bitness(registry->bits_per_long,
818 consumer);
d88aee68 819 if (!socket) {
331744e3 820 ret_val = -1;
ce34fcd0 821 goto error;
d88aee68
DG
822 }
823
331744e3 824 ret = ust_app_push_metadata(registry, socket, 0);
d88aee68 825 if (ret < 0) {
331744e3 826 ret_val = ret;
ce34fcd0 827 goto error;
d88aee68 828 }
dc2bbdae 829 pthread_mutex_unlock(&registry->lock);
d88aee68
DG
830 return 0;
831
ce34fcd0 832error:
dc2bbdae 833 pthread_mutex_unlock(&registry->lock);
331744e3 834 return ret_val;
d88aee68
DG
835}
836
837/*
838 * Send to the consumer a close metadata command for the given session. Once
839 * done, the metadata channel is deleted and the session metadata pointer is
dc2bbdae 840 * nullified. The session lock MUST be held unless the application is
d88aee68
DG
841 * in the destroy path.
842 *
a70ac2f4
MD
843 * Do not hold the registry lock while communicating with the consumerd, because
844 * doing so causes inter-process deadlocks between consumerd and sessiond with
845 * the metadata request notification.
846 *
d88aee68
DG
847 * Return 0 on success else a negative value.
848 */
7972aab2
DG
849static int close_metadata(struct ust_registry_session *registry,
850 struct consumer_output *consumer)
d88aee68
DG
851{
852 int ret;
853 struct consumer_socket *socket;
a70ac2f4
MD
854 uint64_t metadata_key;
855 bool registry_was_already_closed;
d88aee68 856
a0377dfe
FD
857 LTTNG_ASSERT(registry);
858 LTTNG_ASSERT(consumer);
d88aee68 859
7972aab2
DG
860 rcu_read_lock();
861
ce34fcd0 862 pthread_mutex_lock(&registry->lock);
a70ac2f4
MD
863 metadata_key = registry->metadata_key;
864 registry_was_already_closed = registry->metadata_closed;
865 if (metadata_key != 0) {
866 /*
867 * Metadata closed. Even on error this means that the consumer
868 * is not responding or not found so either way a second close
869 * should NOT be emit for this registry.
870 */
871 registry->metadata_closed = 1;
872 }
873 pthread_mutex_unlock(&registry->lock);
ce34fcd0 874
a70ac2f4 875 if (metadata_key == 0 || registry_was_already_closed) {
d88aee68 876 ret = 0;
1b532a60 877 goto end;
d88aee68
DG
878 }
879
d88aee68 880 /* Get consumer socket to use to push the metadata.*/
7972aab2
DG
881 socket = consumer_find_socket_by_bitness(registry->bits_per_long,
882 consumer);
d88aee68
DG
883 if (!socket) {
884 ret = -1;
a70ac2f4 885 goto end;
d88aee68
DG
886 }
887
a70ac2f4 888 ret = consumer_close_metadata(socket, metadata_key);
d88aee68 889 if (ret < 0) {
a70ac2f4 890 goto end;
d88aee68
DG
891 }
892
1b532a60 893end:
7972aab2 894 rcu_read_unlock();
d88aee68
DG
895 return ret;
896}
897
36b588ed
MD
898static
899void delete_ust_app_session_rcu(struct rcu_head *head)
900{
901 struct ust_app_session *ua_sess =
902 caa_container_of(head, struct ust_app_session, rcu_head);
903
3c339053 904 lttng_ht_destroy(ua_sess->channels);
36b588ed
MD
905 free(ua_sess);
906}
907
d80a6244
DG
908/*
909 * Delete ust app session safely. RCU read lock must be held before calling
910 * this function.
82cac6d2
JG
911 *
912 * The session list lock must be held by the caller.
d80a6244 913 */
8b366481 914static
d0b96690
DG
915void delete_ust_app_session(int sock, struct ust_app_session *ua_sess,
916 struct ust_app *app)
d80a6244
DG
917{
918 int ret;
bec39940 919 struct lttng_ht_iter iter;
d80a6244 920 struct ust_app_channel *ua_chan;
7972aab2 921 struct ust_registry_session *registry;
d80a6244 922
a0377dfe 923 LTTNG_ASSERT(ua_sess);
48b7cdc2 924 ASSERT_RCU_READ_LOCKED();
d88aee68 925
1b532a60
DG
926 pthread_mutex_lock(&ua_sess->lock);
927
a0377dfe 928 LTTNG_ASSERT(!ua_sess->deleted);
b161602a
MD
929 ua_sess->deleted = true;
930
7972aab2 931 registry = get_session_registry(ua_sess);
fad1ed2f 932 /* Registry can be null on error path during initialization. */
ce34fcd0 933 if (registry) {
d88aee68 934 /* Push metadata for application before freeing the application. */
7972aab2 935 (void) push_metadata(registry, ua_sess->consumer);
d88aee68 936
7972aab2
DG
937 /*
938 * Don't ask to close metadata for global per UID buffers. Close
1b532a60
DG
939 * metadata only on destroy trace session in this case. Also, the
940 * previous push metadata could have flag the metadata registry to
941 * close so don't send a close command if closed.
7972aab2 942 */
ce34fcd0 943 if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) {
7972aab2
DG
944 /* And ask to close it for this session registry. */
945 (void) close_metadata(registry, ua_sess->consumer);
946 }
d80a6244
DG
947 }
948
bec39940
DG
949 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
950 node.node) {
951 ret = lttng_ht_del(ua_sess->channels, &iter);
a0377dfe 952 LTTNG_ASSERT(!ret);
d0b96690 953 delete_ust_app_channel(sock, ua_chan, app);
d80a6244 954 }
d80a6244 955
7972aab2
DG
956 /* In case of per PID, the registry is kept in the session. */
957 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) {
958 struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id);
959 if (reg_pid) {
fad1ed2f
JR
960 /*
961 * Registry can be null on error path during
962 * initialization.
963 */
7972aab2
DG
964 buffer_reg_pid_remove(reg_pid);
965 buffer_reg_pid_destroy(reg_pid);
966 }
967 }
d0b96690 968
aee6bafd 969 if (ua_sess->handle != -1) {
fb45065e 970 pthread_mutex_lock(&app->sock_lock);
b623cb6a 971 ret = lttng_ust_ctl_release_handle(sock, ua_sess->handle);
fb45065e 972 pthread_mutex_unlock(&app->sock_lock);
be355079
JR
973 if (ret < 0) {
974 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
975 DBG3("UST app release session handle failed. Application is dead: pid = %d, sock = %d",
976 app->pid, app->sock);
977 } else if (ret == -EAGAIN) {
978 WARN("UST app release session handle failed. Communication time out: pid = %d, sock = %d",
979 app->pid, app->sock);
980 } else {
981 ERR("UST app release session handle failed with ret %d: pid = %d, sock = %d",
982 ret, app->pid, app->sock);
983 }
ffe60014 984 }
be355079 985
10b56aef
MD
986 /* Remove session from application UST object descriptor. */
987 iter.iter.node = &ua_sess->ust_objd_node.node;
988 ret = lttng_ht_del(app->ust_sessions_objd, &iter);
a0377dfe 989 LTTNG_ASSERT(!ret);
aee6bafd 990 }
10b56aef 991
1b532a60
DG
992 pthread_mutex_unlock(&ua_sess->lock);
993
6addfa37
MD
994 consumer_output_put(ua_sess->consumer);
995
36b588ed 996 call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu);
d80a6244 997}
91d76f53
DG
998
999/*
284d8f55
DG
1000 * Delete a traceable application structure from the global list. Never call
1001 * this function outside of a call_rcu call.
91d76f53 1002 */
8b366481
DG
1003static
1004void delete_ust_app(struct ust_app *app)
91d76f53 1005{
8b366481 1006 int ret, sock;
d42f20df 1007 struct ust_app_session *ua_sess, *tmp_ua_sess;
993578ff
JR
1008 struct lttng_ht_iter iter;
1009 struct ust_app_event_notifier_rule *event_notifier_rule;
5e2abfaf 1010 bool event_notifier_write_fd_is_open;
44d3bd01 1011
82cac6d2
JG
1012 /*
1013 * The session list lock must be held during this function to guarantee
1014 * the existence of ua_sess.
1015 */
1016 session_lock_list();
d80a6244 1017 /* Delete ust app sessions info */
852d0037
DG
1018 sock = app->sock;
1019 app->sock = -1;
d80a6244 1020
8b366481 1021 /* Wipe sessions */
d42f20df
DG
1022 cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head,
1023 teardown_node) {
1024 /* Free every object in the session and the session. */
36b588ed 1025 rcu_read_lock();
d0b96690 1026 delete_ust_app_session(sock, ua_sess, app);
36b588ed 1027 rcu_read_unlock();
d80a6244 1028 }
36b588ed 1029
993578ff
JR
1030 /* Remove the event notifier rules associated with this app. */
1031 rcu_read_lock();
1032 cds_lfht_for_each_entry (app->token_to_event_notifier_rule_ht->ht,
1033 &iter.iter, event_notifier_rule, node.node) {
1034 ret = lttng_ht_del(app->token_to_event_notifier_rule_ht, &iter);
a0377dfe 1035 LTTNG_ASSERT(!ret);
993578ff
JR
1036
1037 delete_ust_app_event_notifier_rule(
1038 app->sock, event_notifier_rule, app);
1039 }
1040
1041 rcu_read_unlock();
1042
3c339053
FD
1043 lttng_ht_destroy(app->sessions);
1044 lttng_ht_destroy(app->ust_sessions_objd);
1045 lttng_ht_destroy(app->ust_objd);
1046 lttng_ht_destroy(app->token_to_event_notifier_rule_ht);
d80a6244 1047
da873412
JR
1048 /*
1049 * This could be NULL if the event notifier setup failed (e.g the app
1050 * was killed or the tracer does not support this feature).
1051 */
1052 if (app->event_notifier_group.object) {
1053 enum lttng_error_code ret_code;
533a90fb
FD
1054 enum event_notifier_error_accounting_status status;
1055
da873412
JR
1056 const int event_notifier_read_fd = lttng_pipe_get_readfd(
1057 app->event_notifier_group.event_pipe);
1058
1059 ret_code = notification_thread_command_remove_tracer_event_source(
412d7227 1060 the_notification_thread_handle,
da873412
JR
1061 event_notifier_read_fd);
1062 if (ret_code != LTTNG_OK) {
1063 ERR("Failed to remove application tracer event source from notification thread");
1064 }
1065
533a90fb
FD
1066 status = event_notifier_error_accounting_unregister_app(app);
1067 if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) {
1068 ERR("Error unregistering app from event notifier error accounting");
1069 }
1070
b623cb6a 1071 lttng_ust_ctl_release_object(sock, app->event_notifier_group.object);
da873412
JR
1072 free(app->event_notifier_group.object);
1073 }
1074
5e2abfaf
JG
1075 event_notifier_write_fd_is_open = lttng_pipe_is_write_open(
1076 app->event_notifier_group.event_pipe);
da873412 1077 lttng_pipe_destroy(app->event_notifier_group.event_pipe);
5e2abfaf
JG
1078 /*
1079 * Release the file descriptors reserved for the event notifier pipe.
1080 * The app could be destroyed before the write end of the pipe could be
1081 * passed to the application (and closed). In that case, both file
1082 * descriptors must be released.
1083 */
1084 lttng_fd_put(LTTNG_FD_APPS, event_notifier_write_fd_is_open ? 2 : 1);
da873412 1085
6414a713 1086 /*
852d0037
DG
1087 * Wait until we have deleted the application from the sock hash table
1088 * before closing this socket, otherwise an application could re-use the
1089 * socket ID and race with the teardown, using the same hash table entry.
1090 *
1091 * It's OK to leave the close in call_rcu. We want it to stay unique for
1092 * all RCU readers that could run concurrently with unregister app,
1093 * therefore we _need_ to only close that socket after a grace period. So
1094 * it should stay in this RCU callback.
1095 *
1096 * This close() is a very important step of the synchronization model so
1097 * every modification to this function must be carefully reviewed.
6414a713 1098 */
799e2c4f
MD
1099 ret = close(sock);
1100 if (ret) {
1101 PERROR("close");
1102 }
4063050c 1103 lttng_fd_put(LTTNG_FD_APPS, 1);
d80a6244 1104
852d0037 1105 DBG2("UST app pid %d deleted", app->pid);
284d8f55 1106 free(app);
82cac6d2 1107 session_unlock_list();
099e26bd
DG
1108}
1109
1110/*
f6a9efaa 1111 * URCU intermediate call to delete an UST app.
099e26bd 1112 */
8b366481
DG
1113static
1114void delete_ust_app_rcu(struct rcu_head *head)
099e26bd 1115{
bec39940
DG
1116 struct lttng_ht_node_ulong *node =
1117 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa 1118 struct ust_app *app =
852d0037 1119 caa_container_of(node, struct ust_app, pid_n);
f6a9efaa 1120
852d0037 1121 DBG3("Call RCU deleting app PID %d", app->pid);
f6a9efaa 1122 delete_ust_app(app);
099e26bd
DG
1123}
1124
ffe60014
DG
1125/*
1126 * Delete the session from the application ht and delete the data structure by
1127 * freeing every object inside and releasing them.
82cac6d2
JG
1128 *
1129 * The session list lock must be held by the caller.
ffe60014 1130 */
d0b96690 1131static void destroy_app_session(struct ust_app *app,
ffe60014
DG
1132 struct ust_app_session *ua_sess)
1133{
1134 int ret;
1135 struct lttng_ht_iter iter;
1136
a0377dfe
FD
1137 LTTNG_ASSERT(app);
1138 LTTNG_ASSERT(ua_sess);
ffe60014
DG
1139
1140 iter.iter.node = &ua_sess->node.node;
1141 ret = lttng_ht_del(app->sessions, &iter);
1142 if (ret) {
1143 /* Already scheduled for teardown. */
1144 goto end;
1145 }
1146
1147 /* Once deleted, free the data structure. */
d0b96690 1148 delete_ust_app_session(app->sock, ua_sess, app);
ffe60014
DG
1149
1150end:
1151 return;
1152}
1153
8b366481
DG
1154/*
1155 * Alloc new UST app session.
1156 */
1157static
40bbd087 1158struct ust_app_session *alloc_ust_app_session(void)
8b366481
DG
1159{
1160 struct ust_app_session *ua_sess;
1161
1162 /* Init most of the default value by allocating and zeroing */
64803277 1163 ua_sess = zmalloc<ust_app_session>();
8b366481
DG
1164 if (ua_sess == NULL) {
1165 PERROR("malloc");
ffe60014 1166 goto error_free;
8b366481
DG
1167 }
1168
1169 ua_sess->handle = -1;
bec39940 1170 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
fc4b93fa 1171 ua_sess->metadata_attr.type = LTTNG_UST_ABI_CHAN_METADATA;
84ad93e8 1172 pthread_mutex_init(&ua_sess->lock, NULL);
ad7a9107 1173
8b366481
DG
1174 return ua_sess;
1175
ffe60014 1176error_free:
8b366481
DG
1177 return NULL;
1178}
1179
1180/*
1181 * Alloc new UST app channel.
1182 */
1183static
b53d4e59 1184struct ust_app_channel *alloc_ust_app_channel(const char *name,
d0b96690 1185 struct ust_app_session *ua_sess,
fc4b93fa 1186 struct lttng_ust_abi_channel_attr *attr)
8b366481
DG
1187{
1188 struct ust_app_channel *ua_chan;
1189
1190 /* Init most of the default value by allocating and zeroing */
64803277 1191 ua_chan = zmalloc<ust_app_channel>();
8b366481
DG
1192 if (ua_chan == NULL) {
1193 PERROR("malloc");
1194 goto error;
1195 }
1196
1197 /* Setup channel name */
1198 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
1199 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
1200
1201 ua_chan->enabled = 1;
1202 ua_chan->handle = -1;
45893984 1203 ua_chan->session = ua_sess;
ffe60014 1204 ua_chan->key = get_next_channel_key();
bec39940
DG
1205 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1206 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
1207 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
8b366481
DG
1208
1209 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
31746f93 1210 CDS_INIT_LIST_HEAD(&ua_chan->ctx_list);
8b366481
DG
1211
1212 /* Copy attributes */
1213 if (attr) {
b623cb6a 1214 /* Translate from lttng_ust_channel to lttng_ust_ctl_consumer_channel_attr. */
2fe6e7f5
DG
1215 ua_chan->attr.subbuf_size = attr->subbuf_size;
1216 ua_chan->attr.num_subbuf = attr->num_subbuf;
1217 ua_chan->attr.overwrite = attr->overwrite;
1218 ua_chan->attr.switch_timer_interval = attr->switch_timer_interval;
1219 ua_chan->attr.read_timer_interval = attr->read_timer_interval;
7966af57 1220 ua_chan->attr.output = (lttng_ust_abi_output) attr->output;
491d1539 1221 ua_chan->attr.blocking_timeout = attr->u.s.blocking_timeout;
8b366481 1222 }
ffe60014 1223 /* By default, the channel is a per cpu channel. */
fc4b93fa 1224 ua_chan->attr.type = LTTNG_UST_ABI_CHAN_PER_CPU;
8b366481
DG
1225
1226 DBG3("UST app channel %s allocated", ua_chan->name);
1227
1228 return ua_chan;
1229
1230error:
1231 return NULL;
1232}
1233
37f1c236
DG
1234/*
1235 * Allocate and initialize a UST app stream.
1236 *
1237 * Return newly allocated stream pointer or NULL on error.
1238 */
ffe60014 1239struct ust_app_stream *ust_app_alloc_stream(void)
37f1c236
DG
1240{
1241 struct ust_app_stream *stream = NULL;
1242
64803277 1243 stream = zmalloc<ust_app_stream>();
37f1c236
DG
1244 if (stream == NULL) {
1245 PERROR("zmalloc ust app stream");
1246 goto error;
1247 }
1248
1249 /* Zero could be a valid value for a handle so flag it to -1. */
1250 stream->handle = -1;
1251
1252error:
1253 return stream;
1254}
1255
8b366481
DG
1256/*
1257 * Alloc new UST app event.
1258 */
1259static
1260struct ust_app_event *alloc_ust_app_event(char *name,
fc4b93fa 1261 struct lttng_ust_abi_event *attr)
8b366481
DG
1262{
1263 struct ust_app_event *ua_event;
1264
1265 /* Init most of the default value by allocating and zeroing */
64803277 1266 ua_event = zmalloc<ust_app_event>();
8b366481 1267 if (ua_event == NULL) {
20533947 1268 PERROR("Failed to allocate ust_app_event structure");
8b366481
DG
1269 goto error;
1270 }
1271
1272 ua_event->enabled = 1;
1273 strncpy(ua_event->name, name, sizeof(ua_event->name));
1274 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
bec39940 1275 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
8b366481
DG
1276
1277 /* Copy attributes */
1278 if (attr) {
1279 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
1280 }
1281
1282 DBG3("UST app event %s allocated", ua_event->name);
1283
1284 return ua_event;
1285
1286error:
1287 return NULL;
1288}
1289
993578ff
JR
1290/*
1291 * Allocate a new UST app event notifier rule.
1292 */
1293static struct ust_app_event_notifier_rule *alloc_ust_app_event_notifier_rule(
267d66aa 1294 struct lttng_trigger *trigger)
993578ff
JR
1295{
1296 enum lttng_event_rule_generate_exclusions_status
1297 generate_exclusion_status;
cc3b9644 1298 enum lttng_condition_status cond_status;
993578ff 1299 struct ust_app_event_notifier_rule *ua_event_notifier_rule;
267d66aa
JR
1300 struct lttng_condition *condition = NULL;
1301 const struct lttng_event_rule *event_rule = NULL;
993578ff 1302
64803277 1303 ua_event_notifier_rule = zmalloc<ust_app_event_notifier_rule>();
993578ff
JR
1304 if (ua_event_notifier_rule == NULL) {
1305 PERROR("Failed to allocate ust_app_event_notifier_rule structure");
1306 goto error;
1307 }
1308
1309 ua_event_notifier_rule->enabled = 1;
267d66aa
JR
1310 ua_event_notifier_rule->token = lttng_trigger_get_tracer_token(trigger);
1311 lttng_ht_node_init_u64(&ua_event_notifier_rule->node,
1312 ua_event_notifier_rule->token);
993578ff 1313
267d66aa 1314 condition = lttng_trigger_get_condition(trigger);
a0377dfe
FD
1315 LTTNG_ASSERT(condition);
1316 LTTNG_ASSERT(lttng_condition_get_type(condition) ==
8dbb86b8 1317 LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES);
267d66aa 1318
cc3b9644
FD
1319 cond_status = lttng_condition_event_rule_matches_get_rule(
1320 condition, &event_rule);
a0377dfe
FD
1321 LTTNG_ASSERT(cond_status == LTTNG_CONDITION_STATUS_OK);
1322 LTTNG_ASSERT(event_rule);
993578ff 1323
46e9a5fb 1324 ua_event_notifier_rule->error_counter_index =
8dbb86b8 1325 lttng_condition_event_rule_matches_get_error_counter_index(condition);
267d66aa
JR
1326 /* Acquire the event notifier's reference to the trigger. */
1327 lttng_trigger_get(trigger);
1328
1329 ua_event_notifier_rule->trigger = trigger;
993578ff
JR
1330 ua_event_notifier_rule->filter = lttng_event_rule_get_filter_bytecode(event_rule);
1331 generate_exclusion_status = lttng_event_rule_generate_exclusions(
1332 event_rule, &ua_event_notifier_rule->exclusion);
1333 switch (generate_exclusion_status) {
1334 case LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_OK:
1335 case LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_NONE:
1336 break;
1337 default:
8f0646a0 1338 /* Error occurred. */
267d66aa
JR
1339 ERR("Failed to generate exclusions from trigger while allocating an event notifier rule");
1340 goto error_put_trigger;
993578ff
JR
1341 }
1342
1343 DBG3("UST app event notifier rule allocated: token = %" PRIu64,
1344 ua_event_notifier_rule->token);
1345
1346 return ua_event_notifier_rule;
1347
267d66aa
JR
1348error_put_trigger:
1349 lttng_trigger_put(trigger);
993578ff
JR
1350error:
1351 free(ua_event_notifier_rule);
1352 return NULL;
1353}
1354
8b366481
DG
1355/*
1356 * Alloc new UST app context.
1357 */
1358static
bdf64013 1359struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx)
8b366481
DG
1360{
1361 struct ust_app_ctx *ua_ctx;
1362
64803277 1363 ua_ctx = zmalloc<ust_app_ctx>();
8b366481
DG
1364 if (ua_ctx == NULL) {
1365 goto error;
1366 }
1367
31746f93
DG
1368 CDS_INIT_LIST_HEAD(&ua_ctx->list);
1369
8b366481
DG
1370 if (uctx) {
1371 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
fc4b93fa 1372 if (uctx->ctx == LTTNG_UST_ABI_CONTEXT_APP_CONTEXT) {
f3db82be 1373 char *provider_name = NULL, *ctx_name = NULL;
bdf64013
JG
1374
1375 provider_name = strdup(uctx->u.app_ctx.provider_name);
1376 ctx_name = strdup(uctx->u.app_ctx.ctx_name);
1377 if (!provider_name || !ctx_name) {
1378 free(provider_name);
1379 free(ctx_name);
1380 goto error;
1381 }
1382
1383 ua_ctx->ctx.u.app_ctx.provider_name = provider_name;
1384 ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name;
1385 }
8b366481
DG
1386 }
1387
1388 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
8b366481 1389 return ua_ctx;
bdf64013
JG
1390error:
1391 free(ua_ctx);
1392 return NULL;
8b366481
DG
1393}
1394
51755dc8
JG
1395/*
1396 * Create a liblttng-ust filter bytecode from given bytecode.
1397 *
1398 * Return allocated filter or NULL on error.
1399 */
fc4b93fa
MD
1400static struct lttng_ust_abi_filter_bytecode *create_ust_filter_bytecode_from_bytecode(
1401 const struct lttng_bytecode *orig_f)
51755dc8 1402{
fc4b93fa 1403 struct lttng_ust_abi_filter_bytecode *filter = NULL;
51755dc8 1404
f2eafd2d 1405 /* Copy filter bytecode. */
64803277 1406 filter = zmalloc<lttng_ust_abi_filter_bytecode>(sizeof(*filter) + orig_f->len);
51755dc8 1407 if (!filter) {
f2eafd2d 1408 PERROR("Failed to allocate lttng_ust_filter_bytecode: bytecode len = %" PRIu32 " bytes", orig_f->len);
51755dc8
JG
1409 goto error;
1410 }
1411
a0377dfe 1412 LTTNG_ASSERT(sizeof(struct lttng_bytecode) ==
fc4b93fa 1413 sizeof(struct lttng_ust_abi_filter_bytecode));
51755dc8
JG
1414 memcpy(filter, orig_f, sizeof(*filter) + orig_f->len);
1415error:
1416 return filter;
1417}
1418
f2eafd2d
JR
1419/*
1420 * Create a liblttng-ust capture bytecode from given bytecode.
1421 *
1422 * Return allocated filter or NULL on error.
1423 */
fc4b93fa 1424static struct lttng_ust_abi_capture_bytecode *
f2eafd2d
JR
1425create_ust_capture_bytecode_from_bytecode(const struct lttng_bytecode *orig_f)
1426{
fc4b93fa 1427 struct lttng_ust_abi_capture_bytecode *capture = NULL;
f2eafd2d
JR
1428
1429 /* Copy capture bytecode. */
64803277 1430 capture = zmalloc<lttng_ust_abi_capture_bytecode>(sizeof(*capture) + orig_f->len);
f2eafd2d 1431 if (!capture) {
fc4b93fa 1432 PERROR("Failed to allocate lttng_ust_abi_capture_bytecode: bytecode len = %" PRIu32 " bytes", orig_f->len);
f2eafd2d
JR
1433 goto error;
1434 }
1435
a0377dfe 1436 LTTNG_ASSERT(sizeof(struct lttng_bytecode) ==
fc4b93fa 1437 sizeof(struct lttng_ust_abi_capture_bytecode));
f2eafd2d
JR
1438 memcpy(capture, orig_f, sizeof(*capture) + orig_f->len);
1439error:
1440 return capture;
1441}
1442
099e26bd 1443/*
421cb601
DG
1444 * Find an ust_app using the sock and return it. RCU read side lock must be
1445 * held before calling this helper function.
099e26bd 1446 */
f20baf8e 1447struct ust_app *ust_app_find_by_sock(int sock)
099e26bd 1448{
bec39940 1449 struct lttng_ht_node_ulong *node;
bec39940 1450 struct lttng_ht_iter iter;
f6a9efaa 1451
48b7cdc2
FD
1452 ASSERT_RCU_READ_LOCKED();
1453
852d0037 1454 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 1455 node = lttng_ht_iter_get_node_ulong(&iter);
f6a9efaa
DG
1456 if (node == NULL) {
1457 DBG2("UST app find by sock %d not found", sock);
f6a9efaa
DG
1458 goto error;
1459 }
852d0037
DG
1460
1461 return caa_container_of(node, struct ust_app, sock_n);
f6a9efaa
DG
1462
1463error:
1464 return NULL;
099e26bd
DG
1465}
1466
d0b96690
DG
1467/*
1468 * Find an ust_app using the notify sock and return it. RCU read side lock must
1469 * be held before calling this helper function.
1470 */
1471static struct ust_app *find_app_by_notify_sock(int sock)
1472{
1473 struct lttng_ht_node_ulong *node;
1474 struct lttng_ht_iter iter;
1475
48b7cdc2
FD
1476 ASSERT_RCU_READ_LOCKED();
1477
d0b96690
DG
1478 lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock),
1479 &iter);
1480 node = lttng_ht_iter_get_node_ulong(&iter);
1481 if (node == NULL) {
1482 DBG2("UST app find by notify sock %d not found", sock);
1483 goto error;
1484 }
1485
1486 return caa_container_of(node, struct ust_app, notify_sock_n);
1487
1488error:
1489 return NULL;
1490}
1491
025faf73
DG
1492/*
1493 * Lookup for an ust app event based on event name, filter bytecode and the
1494 * event loglevel.
1495 *
1496 * Return an ust_app_event object or NULL on error.
1497 */
18eace3b 1498static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht,
2b00d462 1499 const char *name, const struct lttng_bytecode *filter,
2106efa0 1500 int loglevel_value,
39c5a3a7 1501 const struct lttng_event_exclusion *exclusion)
18eace3b
DG
1502{
1503 struct lttng_ht_iter iter;
1504 struct lttng_ht_node_str *node;
1505 struct ust_app_event *event = NULL;
1506 struct ust_app_ht_key key;
18eace3b 1507
a0377dfe
FD
1508 LTTNG_ASSERT(name);
1509 LTTNG_ASSERT(ht);
18eace3b
DG
1510
1511 /* Setup key for event lookup. */
1512 key.name = name;
1513 key.filter = filter;
7966af57 1514 key.loglevel_type = (lttng_ust_abi_loglevel_type) loglevel_value;
39c5a3a7 1515 /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */
51755dc8 1516 key.exclusion = exclusion;
18eace3b 1517
025faf73
DG
1518 /* Lookup using the event name as hash and a custom match fct. */
1519 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
1520 ht_match_ust_app_event, &key, &iter.iter);
18eace3b
DG
1521 node = lttng_ht_iter_get_node_str(&iter);
1522 if (node == NULL) {
1523 goto end;
1524 }
1525
1526 event = caa_container_of(node, struct ust_app_event, node);
1527
1528end:
18eace3b
DG
1529 return event;
1530}
1531
993578ff
JR
1532/*
1533 * Look-up an event notifier rule based on its token id.
1534 *
1535 * Must be called with the RCU read lock held.
1536 * Return an ust_app_event_notifier_rule object or NULL on error.
1537 */
1538static struct ust_app_event_notifier_rule *find_ust_app_event_notifier_rule(
1539 struct lttng_ht *ht, uint64_t token)
1540{
1541 struct lttng_ht_iter iter;
1542 struct lttng_ht_node_u64 *node;
1543 struct ust_app_event_notifier_rule *event_notifier_rule = NULL;
1544
a0377dfe 1545 LTTNG_ASSERT(ht);
48b7cdc2 1546 ASSERT_RCU_READ_LOCKED();
993578ff
JR
1547
1548 lttng_ht_lookup(ht, &token, &iter);
1549 node = lttng_ht_iter_get_node_u64(&iter);
1550 if (node == NULL) {
1551 DBG2("UST app event notifier rule token not found: token = %" PRIu64,
1552 token);
1553 goto end;
1554 }
1555
1556 event_notifier_rule = caa_container_of(
1557 node, struct ust_app_event_notifier_rule, node);
1558end:
1559 return event_notifier_rule;
1560}
1561
55cc08a6
DG
1562/*
1563 * Create the channel context on the tracer.
d0b96690
DG
1564 *
1565 * Called with UST app session lock held.
55cc08a6
DG
1566 */
1567static
1568int create_ust_channel_context(struct ust_app_channel *ua_chan,
1569 struct ust_app_ctx *ua_ctx, struct ust_app *app)
1570{
1571 int ret;
1572
840cb59c 1573 health_code_update();
86acf0da 1574
fb45065e 1575 pthread_mutex_lock(&app->sock_lock);
b623cb6a 1576 ret = lttng_ust_ctl_add_context(app->sock, &ua_ctx->ctx,
55cc08a6 1577 ua_chan->obj, &ua_ctx->obj);
fb45065e 1578 pthread_mutex_unlock(&app->sock_lock);
55cc08a6 1579 if (ret < 0) {
be355079
JR
1580 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
1581 ret = 0;
1582 DBG3("UST app create channel context failed. Application is dead: pid = %d, sock = %d",
1583 app->pid, app->sock);
1584 } else if (ret == -EAGAIN) {
3757b385 1585 ret = 0;
be355079
JR
1586 WARN("UST app create channel context failed. Communication time out: pid = %d, sock = %d",
1587 app->pid, app->sock);
1588 } else {
1589 ERR("UST app create channel context failed with ret %d: pid = %d, sock = %d",
1590 ret, app->pid, app->sock);
ffe60014 1591 }
55cc08a6
DG
1592 goto error;
1593 }
1594
1595 ua_ctx->handle = ua_ctx->obj->handle;
1596
d0b96690
DG
1597 DBG2("UST app context handle %d created successfully for channel %s",
1598 ua_ctx->handle, ua_chan->name);
55cc08a6
DG
1599
1600error:
840cb59c 1601 health_code_update();
55cc08a6
DG
1602 return ret;
1603}
1604
53a80697
MD
1605/*
1606 * Set the filter on the tracer.
1607 */
a154c7b8 1608static int set_ust_object_filter(struct ust_app *app,
2b00d462 1609 const struct lttng_bytecode *bytecode,
fc4b93fa 1610 struct lttng_ust_abi_object_data *ust_object)
53a80697
MD
1611{
1612 int ret;
fc4b93fa 1613 struct lttng_ust_abi_filter_bytecode *ust_bytecode = NULL;
53a80697 1614
840cb59c 1615 health_code_update();
86acf0da 1616
f2eafd2d 1617 ust_bytecode = create_ust_filter_bytecode_from_bytecode(bytecode);
51755dc8
JG
1618 if (!ust_bytecode) {
1619 ret = -LTTNG_ERR_NOMEM;
1620 goto error;
1621 }
fb45065e 1622 pthread_mutex_lock(&app->sock_lock);
b623cb6a 1623 ret = lttng_ust_ctl_set_filter(app->sock, ust_bytecode,
a154c7b8 1624 ust_object);
fb45065e 1625 pthread_mutex_unlock(&app->sock_lock);
53a80697 1626 if (ret < 0) {
be355079 1627 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
3757b385 1628 ret = 0;
be355079
JR
1629 DBG3("UST app set filter failed. Application is dead: pid = %d, sock = %d",
1630 app->pid, app->sock);
1631 } else if (ret == -EAGAIN) {
1632 ret = 0;
1633 WARN("UST app set filter failed. Communication time out: pid = %d, sock = %d",
1634 app->pid, app->sock);
1635 } else {
1636 ERR("UST app set filter failed with ret %d: pid = %d, sock = %d, object = %p",
1637 ret, app->pid, app->sock, ust_object);
ffe60014 1638 }
53a80697
MD
1639 goto error;
1640 }
1641
f2eafd2d
JR
1642 DBG2("UST filter successfully set: object = %p", ust_object);
1643
1644error:
1645 health_code_update();
1646 free(ust_bytecode);
1647 return ret;
1648}
1649
1650/*
1651 * Set a capture bytecode for the passed object.
11f6ce94
JR
1652 * The sequence number enforces the ordering at runtime and on reception of
1653 * the captured payloads.
f2eafd2d
JR
1654 */
1655static int set_ust_capture(struct ust_app *app,
1656 const struct lttng_bytecode *bytecode,
11f6ce94 1657 unsigned int capture_seqnum,
3d1384a4 1658 struct lttng_ust_abi_object_data *ust_object)
f2eafd2d
JR
1659{
1660 int ret;
fc4b93fa 1661 struct lttng_ust_abi_capture_bytecode *ust_bytecode = NULL;
f2eafd2d
JR
1662
1663 health_code_update();
1664
1665 ust_bytecode = create_ust_capture_bytecode_from_bytecode(bytecode);
1666 if (!ust_bytecode) {
1667 ret = -LTTNG_ERR_NOMEM;
1668 goto error;
1669 }
1670
11f6ce94
JR
1671 /*
1672 * Set the sequence number to ensure the capture of fields is ordered.
1673 */
1674 ust_bytecode->seqnum = capture_seqnum;
1675
f2eafd2d 1676 pthread_mutex_lock(&app->sock_lock);
b623cb6a 1677 ret = lttng_ust_ctl_set_capture(app->sock, ust_bytecode,
f2eafd2d
JR
1678 ust_object);
1679 pthread_mutex_unlock(&app->sock_lock);
1680 if (ret < 0) {
be355079
JR
1681 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
1682 ret = 0;
1683 DBG3("UST app set capture failed. Application is dead: pid = %d, sock = %d",
1684 app->pid, app->sock);
1685 } else if (ret == -EAGAIN) {
f2eafd2d 1686 ret = 0;
be355079
JR
1687 DBG3("UST app set capture failed. Communication timeout: pid = %d, sock = %d",
1688 app->pid, app->sock);
1689 } else {
1690 ERR("UST app event set capture failed with ret %d: pid = %d, sock = %d",
1691 ret, app->pid,
1692 app->sock);
f2eafd2d
JR
1693 }
1694
1695 goto error;
1696 }
1697
1698 DBG2("UST capture successfully set: object = %p", ust_object);
53a80697
MD
1699
1700error:
840cb59c 1701 health_code_update();
51755dc8 1702 free(ust_bytecode);
53a80697
MD
1703 return ret;
1704}
1705
51755dc8 1706static
fc4b93fa 1707struct lttng_ust_abi_event_exclusion *create_ust_exclusion_from_exclusion(
c0901ffa 1708 const struct lttng_event_exclusion *exclusion)
51755dc8 1709{
fc4b93fa
MD
1710 struct lttng_ust_abi_event_exclusion *ust_exclusion = NULL;
1711 size_t exclusion_alloc_size = sizeof(struct lttng_ust_abi_event_exclusion) +
1712 LTTNG_UST_ABI_SYM_NAME_LEN * exclusion->count;
51755dc8 1713
64803277 1714 ust_exclusion = zmalloc<lttng_ust_abi_event_exclusion>(exclusion_alloc_size);
51755dc8
JG
1715 if (!ust_exclusion) {
1716 PERROR("malloc");
1717 goto end;
1718 }
1719
a0377dfe 1720 LTTNG_ASSERT(sizeof(struct lttng_event_exclusion) ==
fc4b93fa 1721 sizeof(struct lttng_ust_abi_event_exclusion));
51755dc8
JG
1722 memcpy(ust_exclusion, exclusion, exclusion_alloc_size);
1723end:
1724 return ust_exclusion;
1725}
1726
7cc9a73c
JI
1727/*
1728 * Set event exclusions on the tracer.
1729 */
c0901ffa
JR
1730static int set_ust_object_exclusions(struct ust_app *app,
1731 const struct lttng_event_exclusion *exclusions,
fc4b93fa 1732 struct lttng_ust_abi_object_data *ust_object)
7cc9a73c
JI
1733{
1734 int ret;
fc4b93fa 1735 struct lttng_ust_abi_event_exclusion *ust_exclusions = NULL;
7cc9a73c 1736
a0377dfe 1737 LTTNG_ASSERT(exclusions && exclusions->count > 0);
7cc9a73c 1738
c0901ffa 1739 health_code_update();
7cc9a73c 1740
c0901ffa
JR
1741 ust_exclusions = create_ust_exclusion_from_exclusion(
1742 exclusions);
1743 if (!ust_exclusions) {
51755dc8
JG
1744 ret = -LTTNG_ERR_NOMEM;
1745 goto error;
1746 }
fb45065e 1747 pthread_mutex_lock(&app->sock_lock);
b623cb6a 1748 ret = lttng_ust_ctl_set_exclusion(app->sock, ust_exclusions, ust_object);
fb45065e 1749 pthread_mutex_unlock(&app->sock_lock);
7cc9a73c 1750 if (ret < 0) {
be355079
JR
1751 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
1752 ret = 0;
1753 DBG3("UST app event exclusion failed. Application is dead: pid = %d, sock = %d",
1754 app->pid, app->sock);
1755 } else if (ret == -EAGAIN) {
7cc9a73c 1756 ret = 0;
be355079
JR
1757 WARN("UST app event exclusion failed. Communication time out(pid: %d, sock = %d",
1758 app->pid, app->sock);
1759 } else {
1760 ERR("UST app event exclusions failed with ret %d: pid = %d, sock = %d, object = %p",
1761 ret, app->pid, app->sock, ust_object);
7cc9a73c
JI
1762 }
1763 goto error;
1764 }
1765
c0901ffa 1766 DBG2("UST exclusions set successfully for object %p", ust_object);
7cc9a73c
JI
1767
1768error:
1769 health_code_update();
c0901ffa 1770 free(ust_exclusions);
7cc9a73c
JI
1771 return ret;
1772}
1773
9730260e
DG
1774/*
1775 * Disable the specified event on to UST tracer for the UST session.
1776 */
e2456d0a 1777static int disable_ust_object(struct ust_app *app,
fc4b93fa 1778 struct lttng_ust_abi_object_data *object)
9730260e
DG
1779{
1780 int ret;
1781
840cb59c 1782 health_code_update();
86acf0da 1783
fb45065e 1784 pthread_mutex_lock(&app->sock_lock);
b623cb6a 1785 ret = lttng_ust_ctl_disable(app->sock, object);
fb45065e 1786 pthread_mutex_unlock(&app->sock_lock);
9730260e 1787 if (ret < 0) {
be355079 1788 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
3757b385 1789 ret = 0;
be355079
JR
1790 DBG3("UST app disable object failed. Application is dead: pid = %d, sock = %d",
1791 app->pid, app->sock);
1792 } else if (ret == -EAGAIN) {
1793 ret = 0;
1794 WARN("UST app disable object failed. Communication time out: pid = %d, sock = %d",
1795 app->pid, app->sock);
1796 } else {
1797 ERR("UST app disable object failed with ret %d: pid = %d, sock = %d, object = %p",
1798 ret, app->pid, app->sock, object);
ffe60014 1799 }
9730260e
DG
1800 goto error;
1801 }
1802
be355079 1803 DBG2("UST app object %p disabled successfully for app: pid = %d",
e2456d0a 1804 object, app->pid);
9730260e
DG
1805
1806error:
840cb59c 1807 health_code_update();
9730260e
DG
1808 return ret;
1809}
1810
78f0bacd
DG
1811/*
1812 * Disable the specified channel on to UST tracer for the UST session.
1813 */
1814static int disable_ust_channel(struct ust_app *app,
1815 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
1816{
1817 int ret;
1818
840cb59c 1819 health_code_update();
86acf0da 1820
fb45065e 1821 pthread_mutex_lock(&app->sock_lock);
b623cb6a 1822 ret = lttng_ust_ctl_disable(app->sock, ua_chan->obj);
fb45065e 1823 pthread_mutex_unlock(&app->sock_lock);
78f0bacd 1824 if (ret < 0) {
be355079
JR
1825 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
1826 ret = 0;
1827 DBG3("UST app disable channel failed. Application is dead: pid = %d, sock = %d",
1828 app->pid, app->sock);
1829 } else if (ret == -EAGAIN) {
3757b385 1830 ret = 0;
be355079
JR
1831 WARN("UST app disable channel failed. Communication time out: pid = %d, sock = %d",
1832 app->pid, app->sock);
1833 } else {
1834 ERR("UST app channel %s disable failed, session handle %d, with ret %d: pid = %d, sock = %d",
1835 ua_chan->name, ua_sess->handle, ret,
1836 app->pid, app->sock);
ffe60014 1837 }
78f0bacd
DG
1838 goto error;
1839 }
1840
be355079 1841 DBG2("UST app channel %s disabled successfully for app: pid = %d",
852d0037 1842 ua_chan->name, app->pid);
78f0bacd
DG
1843
1844error:
840cb59c 1845 health_code_update();
78f0bacd
DG
1846 return ret;
1847}
1848
1849/*
1850 * Enable the specified channel on to UST tracer for the UST session.
1851 */
1852static int enable_ust_channel(struct ust_app *app,
1853 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
1854{
1855 int ret;
1856
840cb59c 1857 health_code_update();
86acf0da 1858
fb45065e 1859 pthread_mutex_lock(&app->sock_lock);
b623cb6a 1860 ret = lttng_ust_ctl_enable(app->sock, ua_chan->obj);
fb45065e 1861 pthread_mutex_unlock(&app->sock_lock);
78f0bacd 1862 if (ret < 0) {
be355079
JR
1863 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
1864 ret = 0;
1865 DBG3("UST app channel %s enable failed. Application is dead: pid = %d, sock = %d",
1866 ua_chan->name, app->pid, app->sock);
1867 } else if (ret == -EAGAIN) {
3757b385 1868 ret = 0;
be355079
JR
1869 WARN("UST app channel %s enable failed. Communication time out: pid = %d, sock = %d",
1870 ua_chan->name, app->pid, app->sock);
1871 } else {
1872 ERR("UST app channel %s enable failed, session handle %d, with ret %d: pid = %d, sock = %d",
1873 ua_chan->name, ua_sess->handle, ret,
1874 app->pid, app->sock);
ffe60014 1875 }
78f0bacd
DG
1876 goto error;
1877 }
1878
1879 ua_chan->enabled = 1;
1880
be355079 1881 DBG2("UST app channel %s enabled successfully for app: pid = %d",
852d0037 1882 ua_chan->name, app->pid);
78f0bacd
DG
1883
1884error:
840cb59c 1885 health_code_update();
78f0bacd
DG
1886 return ret;
1887}
1888
edb67388
DG
1889/*
1890 * Enable the specified event on to UST tracer for the UST session.
1891 */
3428a1b7 1892static int enable_ust_object(
fc4b93fa 1893 struct ust_app *app, struct lttng_ust_abi_object_data *ust_object)
edb67388
DG
1894{
1895 int ret;
1896
840cb59c 1897 health_code_update();
86acf0da 1898
fb45065e 1899 pthread_mutex_lock(&app->sock_lock);
b623cb6a 1900 ret = lttng_ust_ctl_enable(app->sock, ust_object);
fb45065e 1901 pthread_mutex_unlock(&app->sock_lock);
edb67388 1902 if (ret < 0) {
be355079 1903 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
3757b385 1904 ret = 0;
be355079
JR
1905 DBG3("UST app enable object failed. Application is dead: pid = %d, sock = %d",
1906 app->pid, app->sock);
1907 } else if (ret == -EAGAIN) {
1908 ret = 0;
1909 WARN("UST app enable object failed. Communication time out: pid = %d, sock = %d",
1910 app->pid, app->sock);
1911 } else {
1912 ERR("UST app enable object failed with ret %d: pid = %d, sock = %d, object = %p",
1913 ret, app->pid, app->sock, ust_object);
ffe60014 1914 }
edb67388
DG
1915 goto error;
1916 }
1917
be355079 1918 DBG2("UST app object %p enabled successfully for app: pid = %d",
3428a1b7 1919 ust_object, app->pid);
edb67388
DG
1920
1921error:
840cb59c 1922 health_code_update();
edb67388
DG
1923 return ret;
1924}
1925
099e26bd 1926/*
7972aab2 1927 * Send channel and stream buffer to application.
4f3ab6ee 1928 *
ffe60014 1929 * Return 0 on success. On error, a negative value is returned.
4f3ab6ee 1930 */
7972aab2
DG
1931static int send_channel_pid_to_ust(struct ust_app *app,
1932 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
4f3ab6ee
DG
1933{
1934 int ret;
ffe60014 1935 struct ust_app_stream *stream, *stmp;
4f3ab6ee 1936
a0377dfe
FD
1937 LTTNG_ASSERT(app);
1938 LTTNG_ASSERT(ua_sess);
1939 LTTNG_ASSERT(ua_chan);
4f3ab6ee 1940
840cb59c 1941 health_code_update();
4f3ab6ee 1942
7972aab2
DG
1943 DBG("UST app sending channel %s to UST app sock %d", ua_chan->name,
1944 app->sock);
86acf0da 1945
ffe60014
DG
1946 /* Send channel to the application. */
1947 ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
a7169585
MD
1948 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
1949 ret = -ENOTCONN; /* Caused by app exiting. */
1950 goto error;
be355079
JR
1951 } else if (ret == -EAGAIN) {
1952 /* Caused by timeout. */
1953 WARN("Communication with application %d timed out on send_channel for channel \"%s\" of session \"%" PRIu64 "\".",
1954 app->pid, ua_chan->name, ua_sess->tracing_id);
1955 /* Treat this the same way as an application that is exiting. */
1956 ret = -ENOTCONN;
1957 goto error;
a7169585 1958 } else if (ret < 0) {
b551a063
DG
1959 goto error;
1960 }
1961
d88aee68
DG
1962 health_code_update();
1963
ffe60014
DG
1964 /* Send all streams to application. */
1965 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
1966 ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream);
a7169585 1967 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
be355079 1968 ret = -ENOTCONN; /* Caused by app exiting. */
a7169585 1969 goto error;
be355079
JR
1970 } else if (ret == -EAGAIN) {
1971 /* Caused by timeout. */
1972 WARN("Communication with application %d timed out on send_stream for stream \"%s\" of channel \"%s\" of session \"%" PRIu64 "\".",
1973 app->pid, stream->name, ua_chan->name,
1974 ua_sess->tracing_id);
acfb63a8
JR
1975 /*
1976 * Treat this the same way as an application that is
1977 * exiting.
1978 */
be355079 1979 ret = -ENOTCONN;
a7169585 1980 } else if (ret < 0) {
ffe60014
DG
1981 goto error;
1982 }
1983 /* We don't need the stream anymore once sent to the tracer. */
1984 cds_list_del(&stream->list);
fb45065e 1985 delete_ust_app_stream(-1, stream, app);
ffe60014 1986 }
ffe60014
DG
1987 /* Flag the channel that it is sent to the application. */
1988 ua_chan->is_sent = 1;
ffe60014 1989
b551a063 1990error:
840cb59c 1991 health_code_update();
b551a063
DG
1992 return ret;
1993}
1994
91d76f53 1995/*
5b4a0ec0 1996 * Create the specified event onto the UST tracer for a UST session.
d0b96690
DG
1997 *
1998 * Should be called with session mutex held.
91d76f53 1999 */
edb67388 2000static
f46376a1 2001int create_ust_event(struct ust_app *app,
edb67388 2002 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
91d76f53 2003{
5b4a0ec0 2004 int ret = 0;
284d8f55 2005
840cb59c 2006 health_code_update();
86acf0da 2007
5b4a0ec0 2008 /* Create UST event on tracer */
fb45065e 2009 pthread_mutex_lock(&app->sock_lock);
b623cb6a 2010 ret = lttng_ust_ctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
5b4a0ec0 2011 &ua_event->obj);
fb45065e 2012 pthread_mutex_unlock(&app->sock_lock);
5b4a0ec0 2013 if (ret < 0) {
be355079
JR
2014 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
2015 ret = 0;
2016 DBG3("UST app create event failed. Application is dead: pid = %d, sock = %d",
2017 app->pid, app->sock);
2018 } else if (ret == -EAGAIN) {
3757b385 2019 ret = 0;
be355079
JR
2020 WARN("UST app create event failed. Communication time out: pid = %d, sock = %d",
2021 app->pid, app->sock);
2022 } else {
2023 ERR("UST app create event '%s' failed with ret %d: pid = %d, sock = %d",
2024 ua_event->attr.name, ret, app->pid,
2025 app->sock);
ffe60014 2026 }
5b4a0ec0 2027 goto error;
91d76f53 2028 }
f6a9efaa 2029
5b4a0ec0 2030 ua_event->handle = ua_event->obj->handle;
284d8f55 2031
be355079 2032 DBG2("UST app event %s created successfully for pid:%d object = %p",
3428a1b7 2033 ua_event->attr.name, app->pid, ua_event->obj);
f6a9efaa 2034
840cb59c 2035 health_code_update();
86acf0da 2036
025faf73
DG
2037 /* Set filter if one is present. */
2038 if (ua_event->filter) {
a154c7b8 2039 ret = set_ust_object_filter(app, ua_event->filter, ua_event->obj);
025faf73
DG
2040 if (ret < 0) {
2041 goto error;
2042 }
2043 }
2044
7cc9a73c
JI
2045 /* Set exclusions for the event */
2046 if (ua_event->exclusion) {
c0901ffa 2047 ret = set_ust_object_exclusions(app, ua_event->exclusion, ua_event->obj);
7cc9a73c
JI
2048 if (ret < 0) {
2049 goto error;
2050 }
2051 }
2052
8535a6d9 2053 /* If event not enabled, disable it on the tracer */
40113787
MD
2054 if (ua_event->enabled) {
2055 /*
2056 * We now need to explicitly enable the event, since it
2057 * is now disabled at creation.
2058 */
3428a1b7 2059 ret = enable_ust_object(app, ua_event->obj);
40113787
MD
2060 if (ret < 0) {
2061 /*
2062 * If we hit an EPERM, something is wrong with our enable call. If
2063 * we get an EEXIST, there is a problem on the tracer side since we
2064 * just created it.
2065 */
2066 switch (ret) {
2067 case -LTTNG_UST_ERR_PERM:
2068 /* Code flow problem */
a0377dfe 2069 abort();
40113787
MD
2070 case -LTTNG_UST_ERR_EXIST:
2071 /* It's OK for our use case. */
2072 ret = 0;
2073 break;
2074 default:
2075 break;
2076 }
2077 goto error;
2078 }
8535a6d9
DG
2079 }
2080
5b4a0ec0 2081error:
840cb59c 2082 health_code_update();
5b4a0ec0 2083 return ret;
91d76f53 2084}
48842b30 2085
993578ff
JR
2086static int init_ust_event_notifier_from_event_rule(
2087 const struct lttng_event_rule *rule,
fc4b93fa 2088 struct lttng_ust_abi_event_notifier *event_notifier)
993578ff
JR
2089{
2090 enum lttng_event_rule_status status;
fc4b93fa 2091 enum lttng_ust_abi_loglevel_type ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_ALL;
993578ff
JR
2092 int loglevel = -1, ret = 0;
2093 const char *pattern;
2094
993578ff
JR
2095
2096 memset(event_notifier, 0, sizeof(*event_notifier));
2097
44760c20
JR
2098 if (lttng_event_rule_targets_agent_domain(rule)) {
2099 /*
2100 * Special event for agents
2101 * The actual meat of the event is in the filter that will be
2102 * attached later on.
2103 * Set the default values for the agent event.
2104 */
2105 pattern = event_get_default_agent_ust_name(
2106 lttng_event_rule_get_domain_type(rule));
2107 loglevel = 0;
fc4b93fa 2108 ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_ALL;
44760c20 2109 } else {
85b05318 2110 const struct lttng_log_level_rule *log_level_rule;
993578ff 2111
a0377dfe 2112 LTTNG_ASSERT(lttng_event_rule_get_type(rule) ==
695f7044
JR
2113 LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT);
2114
2115 status = lttng_event_rule_user_tracepoint_get_name_pattern(rule, &pattern);
44760c20
JR
2116 if (status != LTTNG_EVENT_RULE_STATUS_OK) {
2117 /* At this point, this is a fatal error. */
2118 abort();
2119 }
993578ff 2120
695f7044 2121 status = lttng_event_rule_user_tracepoint_get_log_level_rule(
85b05318
JR
2122 rule, &log_level_rule);
2123 if (status == LTTNG_EVENT_RULE_STATUS_UNSET) {
fc4b93fa 2124 ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_ALL;
85b05318
JR
2125 } else if (status == LTTNG_EVENT_RULE_STATUS_OK) {
2126 enum lttng_log_level_rule_status llr_status;
2127
2128 switch (lttng_log_level_rule_get_type(log_level_rule)) {
2129 case LTTNG_LOG_LEVEL_RULE_TYPE_EXACTLY:
2130 ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_SINGLE;
2131 llr_status = lttng_log_level_rule_exactly_get_level(
2132 log_level_rule, &loglevel);
2133 break;
2134 case LTTNG_LOG_LEVEL_RULE_TYPE_AT_LEAST_AS_SEVERE_AS:
2135 ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_RANGE;
2136 llr_status = lttng_log_level_rule_at_least_as_severe_as_get_level(
2137 log_level_rule, &loglevel);
2138 break;
2139 default:
2140 abort();
2141 }
993578ff 2142
a0377dfe 2143 LTTNG_ASSERT(llr_status == LTTNG_LOG_LEVEL_RULE_STATUS_OK);
85b05318
JR
2144 } else {
2145 /* At this point this is a fatal error. */
2146 abort();
44760c20 2147 }
993578ff
JR
2148 }
2149
fc4b93fa 2150 event_notifier->event.instrumentation = LTTNG_UST_ABI_TRACEPOINT;
993578ff 2151 ret = lttng_strncpy(event_notifier->event.name, pattern,
4ab5469c 2152 sizeof(event_notifier->event.name));
993578ff
JR
2153 if (ret) {
2154 ERR("Failed to copy event rule pattern to notifier: pattern = '%s' ",
2155 pattern);
2156 goto end;
2157 }
2158
2159 event_notifier->event.loglevel_type = ust_loglevel_type;
2160 event_notifier->event.loglevel = loglevel;
2161end:
2162 return ret;
2163}
2164
2165/*
2166 * Create the specified event notifier against the user space tracer of a
2167 * given application.
2168 */
2169static int create_ust_event_notifier(struct ust_app *app,
2170 struct ust_app_event_notifier_rule *ua_event_notifier_rule)
2171{
2172 int ret = 0;
267d66aa
JR
2173 enum lttng_condition_status condition_status;
2174 const struct lttng_condition *condition = NULL;
fc4b93fa 2175 struct lttng_ust_abi_event_notifier event_notifier;
267d66aa 2176 const struct lttng_event_rule *event_rule = NULL;
f83be61d
JR
2177 unsigned int capture_bytecode_count = 0, i;
2178 enum lttng_condition_status cond_status;
695f7044 2179 enum lttng_event_rule_type event_rule_type;
993578ff
JR
2180
2181 health_code_update();
a0377dfe 2182 LTTNG_ASSERT(app->event_notifier_group.object);
993578ff 2183
267d66aa
JR
2184 condition = lttng_trigger_get_const_condition(
2185 ua_event_notifier_rule->trigger);
a0377dfe
FD
2186 LTTNG_ASSERT(condition);
2187 LTTNG_ASSERT(lttng_condition_get_type(condition) ==
8dbb86b8 2188 LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES);
993578ff 2189
8dbb86b8 2190 condition_status = lttng_condition_event_rule_matches_get_rule(
d602bd6a 2191 condition, &event_rule);
a0377dfe 2192 LTTNG_ASSERT(condition_status == LTTNG_CONDITION_STATUS_OK);
d602bd6a 2193
a0377dfe 2194 LTTNG_ASSERT(event_rule);
695f7044
JR
2195
2196 event_rule_type = lttng_event_rule_get_type(event_rule);
a0377dfe 2197 LTTNG_ASSERT(event_rule_type == LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT ||
695f7044
JR
2198 event_rule_type == LTTNG_EVENT_RULE_TYPE_JUL_LOGGING ||
2199 event_rule_type ==
2200 LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING ||
2201 event_rule_type ==
2202 LTTNG_EVENT_RULE_TYPE_PYTHON_LOGGING);
267d66aa
JR
2203
2204 init_ust_event_notifier_from_event_rule(event_rule, &event_notifier);
993578ff 2205 event_notifier.event.token = ua_event_notifier_rule->token;
533a90fb 2206 event_notifier.error_counter_index = ua_event_notifier_rule->error_counter_index;
993578ff
JR
2207
2208 /* Create UST event notifier against the tracer. */
2209 pthread_mutex_lock(&app->sock_lock);
b623cb6a 2210 ret = lttng_ust_ctl_create_event_notifier(app->sock, &event_notifier,
993578ff
JR
2211 app->event_notifier_group.object,
2212 &ua_event_notifier_rule->obj);
2213 pthread_mutex_unlock(&app->sock_lock);
2214 if (ret < 0) {
be355079 2215 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
993578ff 2216 ret = 0;
be355079
JR
2217 DBG3("UST app create event notifier failed. Application is dead: pid = %d, sock = %d",
2218 app->pid, app->sock);
2219 } else if (ret == -EAGAIN) {
2220 ret = 0;
2221 WARN("UST app create event notifier failed. Communication time out: pid = %d, sock = %d",
2222 app->pid, app->sock);
2223 } else {
2224 ERR("UST app create event notifier '%s' failed with ret %d: pid = %d, sock = %d",
2225 event_notifier.event.name, ret, app->pid,
2226 app->sock);
993578ff 2227 }
993578ff
JR
2228 goto error;
2229 }
2230
2231 ua_event_notifier_rule->handle = ua_event_notifier_rule->obj->handle;
2232
9324443a 2233 DBG2("UST app event notifier %s created successfully: app = '%s': pid = %d, object = %p",
be355079 2234 event_notifier.event.name, app->name, app->pid,
993578ff
JR
2235 ua_event_notifier_rule->obj);
2236
2237 health_code_update();
2238
2239 /* Set filter if one is present. */
2240 if (ua_event_notifier_rule->filter) {
2241 ret = set_ust_object_filter(app, ua_event_notifier_rule->filter,
2242 ua_event_notifier_rule->obj);
2243 if (ret < 0) {
2244 goto error;
2245 }
2246 }
2247
2248 /* Set exclusions for the event. */
2249 if (ua_event_notifier_rule->exclusion) {
2250 ret = set_ust_object_exclusions(app,
2251 ua_event_notifier_rule->exclusion,
2252 ua_event_notifier_rule->obj);
2253 if (ret < 0) {
2254 goto error;
2255 }
2256 }
f83be61d
JR
2257
2258 /* Set the capture bytecodes. */
8dbb86b8 2259 cond_status = lttng_condition_event_rule_matches_get_capture_descriptor_count(
f83be61d 2260 condition, &capture_bytecode_count);
a0377dfe 2261 LTTNG_ASSERT(cond_status == LTTNG_CONDITION_STATUS_OK);
f83be61d
JR
2262
2263 for (i = 0; i < capture_bytecode_count; i++) {
2264 const struct lttng_bytecode *capture_bytecode =
8dbb86b8 2265 lttng_condition_event_rule_matches_get_capture_bytecode_at_index(
f83be61d
JR
2266 condition, i);
2267
11f6ce94 2268 ret = set_ust_capture(app, capture_bytecode, i,
f83be61d
JR
2269 ua_event_notifier_rule->obj);
2270 if (ret < 0) {
2271 goto error;
2272 }
2273 }
993578ff
JR
2274
2275 /*
2276 * We now need to explicitly enable the event, since it
2277 * is disabled at creation.
2278 */
2279 ret = enable_ust_object(app, ua_event_notifier_rule->obj);
2280 if (ret < 0) {
2281 /*
2282 * If we hit an EPERM, something is wrong with our enable call.
2283 * If we get an EEXIST, there is a problem on the tracer side
2284 * since we just created it.
2285 */
2286 switch (ret) {
2287 case -LTTNG_UST_ERR_PERM:
2288 /* Code flow problem. */
2289 abort();
2290 case -LTTNG_UST_ERR_EXIST:
2291 /* It's OK for our use case. */
2292 ret = 0;
2293 break;
2294 default:
2295 break;
2296 }
2297
2298 goto error;
2299 }
2300
2301 ua_event_notifier_rule->enabled = true;
2302
2303error:
2304 health_code_update();
2305 return ret;
2306}
2307
5b4a0ec0
DG
2308/*
2309 * Copy data between an UST app event and a LTT event.
2310 */
421cb601 2311static void shadow_copy_event(struct ust_app_event *ua_event,
48842b30
DG
2312 struct ltt_ust_event *uevent)
2313{
b4ffad32
JI
2314 size_t exclusion_alloc_size;
2315
48842b30
DG
2316 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
2317 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
2318
fc34caaa
DG
2319 ua_event->enabled = uevent->enabled;
2320
5b4a0ec0
DG
2321 /* Copy event attributes */
2322 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
2323
53a80697
MD
2324 /* Copy filter bytecode */
2325 if (uevent->filter) {
2b00d462 2326 ua_event->filter = lttng_bytecode_copy(uevent->filter);
025faf73 2327 /* Filter might be NULL here in case of ENONEM. */
53a80697 2328 }
b4ffad32
JI
2329
2330 /* Copy exclusion data */
2331 if (uevent->exclusion) {
51755dc8 2332 exclusion_alloc_size = sizeof(struct lttng_event_exclusion) +
fc4b93fa 2333 LTTNG_UST_ABI_SYM_NAME_LEN * uevent->exclusion->count;
64803277 2334 ua_event->exclusion = zmalloc<lttng_event_exclusion>(exclusion_alloc_size);
5f8df26c
JI
2335 if (ua_event->exclusion == NULL) {
2336 PERROR("malloc");
2337 } else {
2338 memcpy(ua_event->exclusion, uevent->exclusion,
2339 exclusion_alloc_size);
b4ffad32
JI
2340 }
2341 }
48842b30
DG
2342}
2343
5b4a0ec0
DG
2344/*
2345 * Copy data between an UST app channel and a LTT channel.
2346 */
421cb601 2347static void shadow_copy_channel(struct ust_app_channel *ua_chan,
48842b30
DG
2348 struct ltt_ust_channel *uchan)
2349{
fc34caaa 2350 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
48842b30
DG
2351
2352 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
2353 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
ffe60014 2354
1624d5b7
JD
2355 ua_chan->tracefile_size = uchan->tracefile_size;
2356 ua_chan->tracefile_count = uchan->tracefile_count;
2357
ffe60014
DG
2358 /* Copy event attributes since the layout is different. */
2359 ua_chan->attr.subbuf_size = uchan->attr.subbuf_size;
2360 ua_chan->attr.num_subbuf = uchan->attr.num_subbuf;
2361 ua_chan->attr.overwrite = uchan->attr.overwrite;
2362 ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval;
2363 ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval;
e9404c27 2364 ua_chan->monitor_timer_interval = uchan->monitor_timer_interval;
7966af57 2365 ua_chan->attr.output = (lttng_ust_abi_output) uchan->attr.output;
491d1539
MD
2366 ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout;
2367
ffe60014
DG
2368 /*
2369 * Note that the attribute channel type is not set since the channel on the
2370 * tracing registry side does not have this information.
2371 */
48842b30 2372
fc34caaa 2373 ua_chan->enabled = uchan->enabled;
7972aab2 2374 ua_chan->tracing_channel_id = uchan->id;
fc34caaa 2375
fc34caaa 2376 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
48842b30
DG
2377}
2378
5b4a0ec0
DG
2379/*
2380 * Copy data between a UST app session and a regular LTT session.
2381 */
421cb601 2382static void shadow_copy_session(struct ust_app_session *ua_sess,
bec39940 2383 struct ltt_ust_session *usess, struct ust_app *app)
48842b30 2384{
477d7741
MD
2385 struct tm *timeinfo;
2386 char datetime[16];
2387 int ret;
d7ba1388 2388 char tmp_shm_path[PATH_MAX];
477d7741 2389
940c4592 2390 timeinfo = localtime(&app->registration_time);
477d7741 2391 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
48842b30 2392
421cb601 2393 DBG2("Shadow copy of session handle %d", ua_sess->handle);
48842b30 2394
7972aab2
DG
2395 ua_sess->tracing_id = usess->id;
2396 ua_sess->id = get_next_session_id();
ff588497
JR
2397 LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.uid, app->uid);
2398 LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.gid, app->gid);
2399 LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.uid, usess->uid);
2400 LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.gid, usess->gid);
7972aab2
DG
2401 ua_sess->buffer_type = usess->buffer_type;
2402 ua_sess->bits_per_long = app->bits_per_long;
6addfa37 2403
7972aab2 2404 /* There is only one consumer object per session possible. */
6addfa37 2405 consumer_output_get(usess->consumer);
7972aab2 2406 ua_sess->consumer = usess->consumer;
6addfa37 2407
2bba9e53 2408 ua_sess->output_traces = usess->output_traces;
ecc48a90 2409 ua_sess->live_timer_interval = usess->live_timer_interval;
84ad93e8
DG
2410 copy_channel_attr_to_ustctl(&ua_sess->metadata_attr,
2411 &usess->metadata_attr);
7972aab2
DG
2412
2413 switch (ua_sess->buffer_type) {
2414 case LTTNG_BUFFER_PER_PID:
2415 ret = snprintf(ua_sess->path, sizeof(ua_sess->path),
dec56f6c 2416 DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid,
7972aab2
DG
2417 datetime);
2418 break;
2419 case LTTNG_BUFFER_PER_UID:
2420 ret = snprintf(ua_sess->path, sizeof(ua_sess->path),
470cc211 2421 DEFAULT_UST_TRACE_UID_PATH,
ff588497 2422 lttng_credentials_get_uid(&ua_sess->real_credentials),
470cc211 2423 app->bits_per_long);
7972aab2
DG
2424 break;
2425 default:
a0377dfe 2426 abort();
7972aab2
DG
2427 goto error;
2428 }
477d7741
MD
2429 if (ret < 0) {
2430 PERROR("asprintf UST shadow copy session");
a0377dfe 2431 abort();
7972aab2 2432 goto error;
477d7741
MD
2433 }
2434
3d071855
MD
2435 strncpy(ua_sess->root_shm_path, usess->root_shm_path,
2436 sizeof(ua_sess->root_shm_path));
2437 ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0';
d7ba1388
MD
2438 strncpy(ua_sess->shm_path, usess->shm_path,
2439 sizeof(ua_sess->shm_path));
2440 ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0';
2441 if (ua_sess->shm_path[0]) {
2442 switch (ua_sess->buffer_type) {
2443 case LTTNG_BUFFER_PER_PID:
2444 ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path),
5da88b0f 2445 "/" DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s",
d7ba1388
MD
2446 app->name, app->pid, datetime);
2447 break;
2448 case LTTNG_BUFFER_PER_UID:
2449 ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path),
5da88b0f 2450 "/" DEFAULT_UST_TRACE_UID_PATH,
d7ba1388
MD
2451 app->uid, app->bits_per_long);
2452 break;
2453 default:
a0377dfe 2454 abort();
d7ba1388
MD
2455 goto error;
2456 }
2457 if (ret < 0) {
2458 PERROR("sprintf UST shadow copy session");
a0377dfe 2459 abort();
d7ba1388
MD
2460 goto error;
2461 }
2462 strncat(ua_sess->shm_path, tmp_shm_path,
2463 sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1);
2464 ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0';
2465 }
6addfa37 2466 return;
7972aab2
DG
2467
2468error:
6addfa37 2469 consumer_output_put(ua_sess->consumer);
48842b30
DG
2470}
2471
78f0bacd
DG
2472/*
2473 * Lookup sesison wrapper.
2474 */
84cd17c6 2475static
fb9a95c4 2476void __lookup_session_by_app(const struct ltt_ust_session *usess,
bec39940 2477 struct ust_app *app, struct lttng_ht_iter *iter)
84cd17c6
MD
2478{
2479 /* Get right UST app session from app */
d9bf3ca4 2480 lttng_ht_lookup(app->sessions, &usess->id, iter);
84cd17c6
MD
2481}
2482
421cb601
DG
2483/*
2484 * Return ust app session from the app session hashtable using the UST session
a991f516 2485 * id.
421cb601 2486 */
48842b30 2487static struct ust_app_session *lookup_session_by_app(
fb9a95c4 2488 const struct ltt_ust_session *usess, struct ust_app *app)
48842b30 2489{
bec39940 2490 struct lttng_ht_iter iter;
d9bf3ca4 2491 struct lttng_ht_node_u64 *node;
48842b30 2492
84cd17c6 2493 __lookup_session_by_app(usess, app, &iter);
d9bf3ca4 2494 node = lttng_ht_iter_get_node_u64(&iter);
48842b30
DG
2495 if (node == NULL) {
2496 goto error;
2497 }
2498
2499 return caa_container_of(node, struct ust_app_session, node);
2500
2501error:
2502 return NULL;
2503}
2504
7972aab2
DG
2505/*
2506 * Setup buffer registry per PID for the given session and application. If none
2507 * is found, a new one is created, added to the global registry and
2508 * initialized. If regp is valid, it's set with the newly created object.
2509 *
2510 * Return 0 on success or else a negative value.
2511 */
2512static int setup_buffer_reg_pid(struct ust_app_session *ua_sess,
2513 struct ust_app *app, struct buffer_reg_pid **regp)
2514{
2515 int ret = 0;
2516 struct buffer_reg_pid *reg_pid;
2517
a0377dfe
FD
2518 LTTNG_ASSERT(ua_sess);
2519 LTTNG_ASSERT(app);
7972aab2
DG
2520
2521 rcu_read_lock();
2522
2523 reg_pid = buffer_reg_pid_find(ua_sess->id);
2524 if (!reg_pid) {
2525 /*
2526 * This is the create channel path meaning that if there is NO
2527 * registry available, we have to create one for this session.
2528 */
d7ba1388 2529 ret = buffer_reg_pid_create(ua_sess->id, &reg_pid,
3d071855 2530 ua_sess->root_shm_path, ua_sess->shm_path);
7972aab2
DG
2531 if (ret < 0) {
2532 goto error;
2533 }
7972aab2
DG
2534 } else {
2535 goto end;
2536 }
2537
2538 /* Initialize registry. */
2539 ret = ust_registry_session_init(&reg_pid->registry->reg.ust, app,
2540 app->bits_per_long, app->uint8_t_alignment,
2541 app->uint16_t_alignment, app->uint32_t_alignment,
af6142cf 2542 app->uint64_t_alignment, app->long_alignment,
470cc211
JG
2543 app->byte_order, app->version.major, app->version.minor,
2544 reg_pid->root_shm_path, reg_pid->shm_path,
ff588497
JR
2545 lttng_credentials_get_uid(&ua_sess->effective_credentials),
2546 lttng_credentials_get_gid(&ua_sess->effective_credentials),
2547 ua_sess->tracing_id,
8de88061 2548 app->uid);
7972aab2 2549 if (ret < 0) {
286c991a
MD
2550 /*
2551 * reg_pid->registry->reg.ust is NULL upon error, so we need to
2552 * destroy the buffer registry, because it is always expected
2553 * that if the buffer registry can be found, its ust registry is
2554 * non-NULL.
2555 */
2556 buffer_reg_pid_destroy(reg_pid);
7972aab2
DG
2557 goto error;
2558 }
2559
286c991a
MD
2560 buffer_reg_pid_add(reg_pid);
2561
7972aab2
DG
2562 DBG3("UST app buffer registry per PID created successfully");
2563
2564end:
2565 if (regp) {
2566 *regp = reg_pid;
2567 }
2568error:
2569 rcu_read_unlock();
2570 return ret;
2571}
2572
2573/*
2574 * Setup buffer registry per UID for the given session and application. If none
2575 * is found, a new one is created, added to the global registry and
2576 * initialized. If regp is valid, it's set with the newly created object.
2577 *
2578 * Return 0 on success or else a negative value.
2579 */
2580static int setup_buffer_reg_uid(struct ltt_ust_session *usess,
d7ba1388 2581 struct ust_app_session *ua_sess,
7972aab2
DG
2582 struct ust_app *app, struct buffer_reg_uid **regp)
2583{
2584 int ret = 0;
2585 struct buffer_reg_uid *reg_uid;
2586
a0377dfe
FD
2587 LTTNG_ASSERT(usess);
2588 LTTNG_ASSERT(app);
7972aab2
DG
2589
2590 rcu_read_lock();
2591
2592 reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid);
2593 if (!reg_uid) {
2594 /*
2595 * This is the create channel path meaning that if there is NO
2596 * registry available, we have to create one for this session.
2597 */
2598 ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid,
3d071855
MD
2599 LTTNG_DOMAIN_UST, &reg_uid,
2600 ua_sess->root_shm_path, ua_sess->shm_path);
7972aab2
DG
2601 if (ret < 0) {
2602 goto error;
2603 }
7972aab2
DG
2604 } else {
2605 goto end;
2606 }
2607
2608 /* Initialize registry. */
af6142cf 2609 ret = ust_registry_session_init(&reg_uid->registry->reg.ust, NULL,
7972aab2
DG
2610 app->bits_per_long, app->uint8_t_alignment,
2611 app->uint16_t_alignment, app->uint32_t_alignment,
af6142cf
MD
2612 app->uint64_t_alignment, app->long_alignment,
2613 app->byte_order, app->version.major,
3d071855 2614 app->version.minor, reg_uid->root_shm_path,
8de88061
JR
2615 reg_uid->shm_path, usess->uid, usess->gid,
2616 ua_sess->tracing_id, app->uid);
7972aab2 2617 if (ret < 0) {
286c991a
MD
2618 /*
2619 * reg_uid->registry->reg.ust is NULL upon error, so we need to
2620 * destroy the buffer registry, because it is always expected
2621 * that if the buffer registry can be found, its ust registry is
2622 * non-NULL.
2623 */
2624 buffer_reg_uid_destroy(reg_uid, NULL);
7972aab2
DG
2625 goto error;
2626 }
2627 /* Add node to teardown list of the session. */
2628 cds_list_add(&reg_uid->lnode, &usess->buffer_reg_uid_list);
2629
286c991a 2630 buffer_reg_uid_add(reg_uid);
7972aab2 2631
286c991a 2632 DBG3("UST app buffer registry per UID created successfully");
7972aab2
DG
2633end:
2634 if (regp) {
2635 *regp = reg_uid;
2636 }
2637error:
2638 rcu_read_unlock();
2639 return ret;
2640}
2641
421cb601 2642/*
3d8ca23b 2643 * Create a session on the tracer side for the given app.
421cb601 2644 *
3d8ca23b
DG
2645 * On success, ua_sess_ptr is populated with the session pointer or else left
2646 * untouched. If the session was created, is_created is set to 1. On error,
2647 * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can
2648 * be NULL.
2649 *
2650 * Returns 0 on success or else a negative code which is either -ENOMEM or
b623cb6a 2651 * -ENOTCONN which is the default code if the lttng_ust_ctl_create_session fails.
421cb601 2652 */
03f91eaa 2653static int find_or_create_ust_app_session(struct ltt_ust_session *usess,
3d8ca23b
DG
2654 struct ust_app *app, struct ust_app_session **ua_sess_ptr,
2655 int *is_created)
421cb601 2656{
3d8ca23b 2657 int ret, created = 0;
421cb601
DG
2658 struct ust_app_session *ua_sess;
2659
a0377dfe
FD
2660 LTTNG_ASSERT(usess);
2661 LTTNG_ASSERT(app);
2662 LTTNG_ASSERT(ua_sess_ptr);
3d8ca23b 2663
840cb59c 2664 health_code_update();
86acf0da 2665
421cb601
DG
2666 ua_sess = lookup_session_by_app(usess, app);
2667 if (ua_sess == NULL) {
d9bf3ca4 2668 DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it",
852d0037 2669 app->pid, usess->id);
40bbd087 2670 ua_sess = alloc_ust_app_session();
421cb601
DG
2671 if (ua_sess == NULL) {
2672 /* Only malloc can failed so something is really wrong */
3d8ca23b
DG
2673 ret = -ENOMEM;
2674 goto error;
421cb601 2675 }
477d7741 2676 shadow_copy_session(ua_sess, usess, app);
3d8ca23b 2677 created = 1;
421cb601
DG
2678 }
2679
7972aab2
DG
2680 switch (usess->buffer_type) {
2681 case LTTNG_BUFFER_PER_PID:
2682 /* Init local registry. */
2683 ret = setup_buffer_reg_pid(ua_sess, app, NULL);
421cb601 2684 if (ret < 0) {
e64207cf 2685 delete_ust_app_session(-1, ua_sess, app);
7972aab2
DG
2686 goto error;
2687 }
2688 break;
2689 case LTTNG_BUFFER_PER_UID:
2690 /* Look for a global registry. If none exists, create one. */
d7ba1388 2691 ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL);
7972aab2 2692 if (ret < 0) {
e64207cf 2693 delete_ust_app_session(-1, ua_sess, app);
7972aab2
DG
2694 goto error;
2695 }
2696 break;
2697 default:
a0377dfe 2698 abort();
7972aab2
DG
2699 ret = -EINVAL;
2700 goto error;
2701 }
2702
2703 health_code_update();
2704
2705 if (ua_sess->handle == -1) {
fb45065e 2706 pthread_mutex_lock(&app->sock_lock);
b623cb6a 2707 ret = lttng_ust_ctl_create_session(app->sock);
fb45065e 2708 pthread_mutex_unlock(&app->sock_lock);
7972aab2 2709 if (ret < 0) {
be355079
JR
2710 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
2711 DBG("UST app creating session failed. Application is dead: pid = %d, sock = %d",
2712 app->pid, app->sock);
2713 ret = 0;
2714 } else if (ret == -EAGAIN) {
2715 DBG("UST app creating session failed. Communication time out: pid = %d, sock = %d",
2716 app->pid, app->sock);
3757b385 2717 ret = 0;
be355079
JR
2718 } else {
2719 ERR("UST app creating session failed with ret %d: pid = %d, sock =%d",
2720 ret, app->pid, app->sock);
ffe60014 2721 }
d0b96690 2722 delete_ust_app_session(-1, ua_sess, app);
3d8ca23b
DG
2723 if (ret != -ENOMEM) {
2724 /*
2725 * Tracer is probably gone or got an internal error so let's
2726 * behave like it will soon unregister or not usable.
2727 */
2728 ret = -ENOTCONN;
2729 }
2730 goto error;
421cb601
DG
2731 }
2732
7972aab2
DG
2733 ua_sess->handle = ret;
2734
2735 /* Add ust app session to app's HT */
d9bf3ca4
MD
2736 lttng_ht_node_init_u64(&ua_sess->node,
2737 ua_sess->tracing_id);
2738 lttng_ht_add_unique_u64(app->sessions, &ua_sess->node);
10b56aef
MD
2739 lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle);
2740 lttng_ht_add_unique_ulong(app->ust_sessions_objd,
2741 &ua_sess->ust_objd_node);
7972aab2
DG
2742
2743 DBG2("UST app session created successfully with handle %d", ret);
2744 }
2745
2746 *ua_sess_ptr = ua_sess;
2747 if (is_created) {
2748 *is_created = created;
2749 }
2750
2751 /* Everything went well. */
2752 ret = 0;
2753
2754error:
2755 health_code_update();
2756 return ret;
2757}
2758
6a6b2068
JG
2759/*
2760 * Match function for a hash table lookup of ust_app_ctx.
2761 *
2762 * It matches an ust app context based on the context type and, in the case
2763 * of perf counters, their name.
2764 */
2765static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key)
2766{
2767 struct ust_app_ctx *ctx;
bdf64013 2768 const struct lttng_ust_context_attr *key;
6a6b2068 2769
a0377dfe
FD
2770 LTTNG_ASSERT(node);
2771 LTTNG_ASSERT(_key);
6a6b2068
JG
2772
2773 ctx = caa_container_of(node, struct ust_app_ctx, node.node);
7966af57 2774 key = (lttng_ust_context_attr *) _key;
6a6b2068
JG
2775
2776 /* Context type */
2777 if (ctx->ctx.ctx != key->ctx) {
2778 goto no_match;
2779 }
2780
bdf64013 2781 switch(key->ctx) {
fc4b93fa 2782 case LTTNG_UST_ABI_CONTEXT_PERF_THREAD_COUNTER:
6a6b2068 2783 if (strncmp(key->u.perf_counter.name,
bdf64013
JG
2784 ctx->ctx.u.perf_counter.name,
2785 sizeof(key->u.perf_counter.name))) {
2786 goto no_match;
2787 }
2788 break;
fc4b93fa 2789 case LTTNG_UST_ABI_CONTEXT_APP_CONTEXT:
bdf64013
JG
2790 if (strcmp(key->u.app_ctx.provider_name,
2791 ctx->ctx.u.app_ctx.provider_name) ||
2792 strcmp(key->u.app_ctx.ctx_name,
2793 ctx->ctx.u.app_ctx.ctx_name)) {
6a6b2068
JG
2794 goto no_match;
2795 }
bdf64013
JG
2796 break;
2797 default:
2798 break;
6a6b2068
JG
2799 }
2800
2801 /* Match. */
2802 return 1;
2803
2804no_match:
2805 return 0;
2806}
2807
2808/*
2809 * Lookup for an ust app context from an lttng_ust_context.
2810 *
be184a0f 2811 * Must be called while holding RCU read side lock.
6a6b2068
JG
2812 * Return an ust_app_ctx object or NULL on error.
2813 */
2814static
2815struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht,
bdf64013 2816 struct lttng_ust_context_attr *uctx)
6a6b2068
JG
2817{
2818 struct lttng_ht_iter iter;
2819 struct lttng_ht_node_ulong *node;
2820 struct ust_app_ctx *app_ctx = NULL;
2821
a0377dfe
FD
2822 LTTNG_ASSERT(uctx);
2823 LTTNG_ASSERT(ht);
48b7cdc2 2824 ASSERT_RCU_READ_LOCKED();
6a6b2068
JG
2825
2826 /* Lookup using the lttng_ust_context_type and a custom match fct. */
2827 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed),
2828 ht_match_ust_app_ctx, uctx, &iter.iter);
2829 node = lttng_ht_iter_get_node_ulong(&iter);
2830 if (!node) {
2831 goto end;
2832 }
2833
2834 app_ctx = caa_container_of(node, struct ust_app_ctx, node);
2835
2836end:
2837 return app_ctx;
2838}
2839
7972aab2
DG
2840/*
2841 * Create a context for the channel on the tracer.
2842 *
2843 * Called with UST app session lock held and a RCU read side lock.
2844 */
2845static
c9edf082 2846int create_ust_app_channel_context(struct ust_app_channel *ua_chan,
f3db82be 2847 struct lttng_ust_context_attr *uctx,
7972aab2
DG
2848 struct ust_app *app)
2849{
2850 int ret = 0;
7972aab2
DG
2851 struct ust_app_ctx *ua_ctx;
2852
48b7cdc2
FD
2853 ASSERT_RCU_READ_LOCKED();
2854
7972aab2
DG
2855 DBG2("UST app adding context to channel %s", ua_chan->name);
2856
6a6b2068
JG
2857 ua_ctx = find_ust_app_context(ua_chan->ctx, uctx);
2858 if (ua_ctx) {
7972aab2
DG
2859 ret = -EEXIST;
2860 goto error;
2861 }
2862
2863 ua_ctx = alloc_ust_app_ctx(uctx);
2864 if (ua_ctx == NULL) {
2865 /* malloc failed */
7682f304 2866 ret = -ENOMEM;
7972aab2
DG
2867 goto error;
2868 }
2869
2870 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
aa3514e9 2871 lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node);
31746f93 2872 cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list);
7972aab2
DG
2873
2874 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2875 if (ret < 0) {
2876 goto error;
2877 }
2878
2879error:
2880 return ret;
2881}
2882
2883/*
2884 * Enable on the tracer side a ust app event for the session and channel.
2885 *
2886 * Called with UST app session lock held.
2887 */
2888static
f46376a1
MJ
2889int enable_ust_app_event(struct ust_app_event *ua_event,
2890 struct ust_app *app)
7972aab2
DG
2891{
2892 int ret;
2893
3428a1b7 2894 ret = enable_ust_object(app, ua_event->obj);
7972aab2
DG
2895 if (ret < 0) {
2896 goto error;
2897 }
2898
2899 ua_event->enabled = 1;
2900
2901error:
2902 return ret;
2903}
2904
2905/*
2906 * Disable on the tracer side a ust app event for the session and channel.
2907 */
f46376a1
MJ
2908static int disable_ust_app_event(struct ust_app_event *ua_event,
2909 struct ust_app *app)
7972aab2
DG
2910{
2911 int ret;
2912
e2456d0a 2913 ret = disable_ust_object(app, ua_event->obj);
7972aab2
DG
2914 if (ret < 0) {
2915 goto error;
2916 }
2917
2918 ua_event->enabled = 0;
2919
2920error:
2921 return ret;
2922}
2923
2924/*
2925 * Lookup ust app channel for session and disable it on the tracer side.
2926 */
2927static
2928int disable_ust_app_channel(struct ust_app_session *ua_sess,
2929 struct ust_app_channel *ua_chan, struct ust_app *app)
2930{
2931 int ret;
2932
2933 ret = disable_ust_channel(app, ua_sess, ua_chan);
2934 if (ret < 0) {
2935 goto error;
2936 }
2937
2938 ua_chan->enabled = 0;
2939
2940error:
2941 return ret;
2942}
2943
2944/*
2945 * Lookup ust app channel for session and enable it on the tracer side. This
2946 * MUST be called with a RCU read side lock acquired.
2947 */
2948static int enable_ust_app_channel(struct ust_app_session *ua_sess,
2949 struct ltt_ust_channel *uchan, struct ust_app *app)
2950{
2951 int ret = 0;
2952 struct lttng_ht_iter iter;
2953 struct lttng_ht_node_str *ua_chan_node;
2954 struct ust_app_channel *ua_chan;
2955
48b7cdc2
FD
2956 ASSERT_RCU_READ_LOCKED();
2957
7972aab2
DG
2958 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2959 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2960 if (ua_chan_node == NULL) {
d9bf3ca4 2961 DBG2("Unable to find channel %s in ust session id %" PRIu64,
7972aab2
DG
2962 uchan->name, ua_sess->tracing_id);
2963 goto error;
2964 }
2965
2966 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2967
2968 ret = enable_ust_channel(app, ua_sess, ua_chan);
2969 if (ret < 0) {
2970 goto error;
2971 }
2972
2973error:
2974 return ret;
2975}
2976
2977/*
2978 * Ask the consumer to create a channel and get it if successful.
2979 *
fad1ed2f
JR
2980 * Called with UST app session lock held.
2981 *
7972aab2
DG
2982 * Return 0 on success or else a negative value.
2983 */
2984static int do_consumer_create_channel(struct ltt_ust_session *usess,
2985 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan,
f46376a1 2986 int bitness, struct ust_registry_session *registry)
7972aab2
DG
2987{
2988 int ret;
2989 unsigned int nb_fd = 0;
2990 struct consumer_socket *socket;
2991
a0377dfe
FD
2992 LTTNG_ASSERT(usess);
2993 LTTNG_ASSERT(ua_sess);
2994 LTTNG_ASSERT(ua_chan);
2995 LTTNG_ASSERT(registry);
7972aab2
DG
2996
2997 rcu_read_lock();
2998 health_code_update();
2999
3000 /* Get the right consumer socket for the application. */
3001 socket = consumer_find_socket_by_bitness(bitness, usess->consumer);
3002 if (!socket) {
3003 ret = -EINVAL;
3004 goto error;
3005 }
3006
3007 health_code_update();
3008
3009 /* Need one fd for the channel. */
3010 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
3011 if (ret < 0) {
3012 ERR("Exhausted number of available FD upon create channel");
3013 goto error;
3014 }
3015
3016 /*
3017 * Ask consumer to create channel. The consumer will return the number of
3018 * stream we have to expect.
3019 */
3020 ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket,
d2956687 3021 registry, usess->current_trace_chunk);
7972aab2
DG
3022 if (ret < 0) {
3023 goto error_ask;
3024 }
3025
3026 /*
3027 * Compute the number of fd needed before receiving them. It must be 2 per
3028 * stream (2 being the default value here).
3029 */
3030 nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count;
3031
3032 /* Reserve the amount of file descriptor we need. */
3033 ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd);
3034 if (ret < 0) {
3035 ERR("Exhausted number of available FD upon create channel");
3036 goto error_fd_get_stream;
3037 }
3038
3039 health_code_update();
3040
3041 /*
db786d44 3042 * Now get the channel from the consumer. This call will populate the stream
7972aab2
DG
3043 * list of that channel and set the ust objects.
3044 */
d9078d0c
DG
3045 if (usess->consumer->enabled) {
3046 ret = ust_consumer_get_channel(socket, ua_chan);
3047 if (ret < 0) {
3048 goto error_destroy;
3049 }
7972aab2
DG
3050 }
3051
3052 rcu_read_unlock();
3053 return 0;
3054
3055error_destroy:
3056 lttng_fd_put(LTTNG_FD_APPS, nb_fd);
3057error_fd_get_stream:
3058 /*
3059 * Initiate a destroy channel on the consumer since we had an error
3060 * handling it on our side. The return value is of no importance since we
3061 * already have a ret value set by the previous error that we need to
3062 * return.
3063 */
3064 (void) ust_consumer_destroy_channel(socket, ua_chan);
3065error_ask:
3066 lttng_fd_put(LTTNG_FD_APPS, 1);
3067error:
3068 health_code_update();
3069 rcu_read_unlock();
3070 return ret;
3071}
3072
3073/*
3074 * Duplicate the ust data object of the ust app stream and save it in the
3075 * buffer registry stream.
3076 *
3077 * Return 0 on success or else a negative value.
3078 */
3079static int duplicate_stream_object(struct buffer_reg_stream *reg_stream,
3080 struct ust_app_stream *stream)
3081{
3082 int ret;
3083
a0377dfe
FD
3084 LTTNG_ASSERT(reg_stream);
3085 LTTNG_ASSERT(stream);
7972aab2 3086
86ba1e22 3087 /* Duplicating a stream requires 2 new fds. Reserve them. */
7972aab2
DG
3088 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
3089 if (ret < 0) {
3090 ERR("Exhausted number of available FD upon duplicate stream");
3091 goto error;
3092 }
3093
3094 /* Duplicate object for stream once the original is in the registry. */
b623cb6a 3095 ret = lttng_ust_ctl_duplicate_ust_object_data(&stream->obj,
7972aab2
DG
3096 reg_stream->obj.ust);
3097 if (ret < 0) {
3098 ERR("Duplicate stream obj from %p to %p failed with ret %d",
3099 reg_stream->obj.ust, stream->obj, ret);
3100 lttng_fd_put(LTTNG_FD_APPS, 2);
3101 goto error;
3102 }
3103 stream->handle = stream->obj->handle;
3104
3105error:
3106 return ret;
3107}
3108
3109/*
3110 * Duplicate the ust data object of the ust app. channel and save it in the
3111 * buffer registry channel.
3112 *
3113 * Return 0 on success or else a negative value.
3114 */
3273699d 3115static int duplicate_channel_object(struct buffer_reg_channel *buf_reg_chan,
7972aab2
DG
3116 struct ust_app_channel *ua_chan)
3117{
3118 int ret;
3119
a0377dfe
FD
3120 LTTNG_ASSERT(buf_reg_chan);
3121 LTTNG_ASSERT(ua_chan);
7972aab2 3122
86ba1e22 3123 /* Duplicating a channel requires 1 new fd. Reserve it. */
7972aab2
DG
3124 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
3125 if (ret < 0) {
3126 ERR("Exhausted number of available FD upon duplicate channel");
3127 goto error_fd_get;
3128 }
3129
3130 /* Duplicate object for stream once the original is in the registry. */
b623cb6a 3131 ret = lttng_ust_ctl_duplicate_ust_object_data(&ua_chan->obj, buf_reg_chan->obj.ust);
7972aab2
DG
3132 if (ret < 0) {
3133 ERR("Duplicate channel obj from %p to %p failed with ret: %d",
3273699d 3134 buf_reg_chan->obj.ust, ua_chan->obj, ret);
7972aab2
DG
3135 goto error;
3136 }
3137 ua_chan->handle = ua_chan->obj->handle;
3138
3139 return 0;
3140
3141error:
3142 lttng_fd_put(LTTNG_FD_APPS, 1);
3143error_fd_get:
3144 return ret;
3145}
3146
3147/*
3148 * For a given channel buffer registry, setup all streams of the given ust
3149 * application channel.
3150 *
3151 * Return 0 on success or else a negative value.
3152 */
3273699d 3153static int setup_buffer_reg_streams(struct buffer_reg_channel *buf_reg_chan,
fb45065e
MD
3154 struct ust_app_channel *ua_chan,
3155 struct ust_app *app)
7972aab2
DG
3156{
3157 int ret = 0;
3158 struct ust_app_stream *stream, *stmp;
3159
a0377dfe
FD
3160 LTTNG_ASSERT(buf_reg_chan);
3161 LTTNG_ASSERT(ua_chan);
7972aab2
DG
3162
3163 DBG2("UST app setup buffer registry stream");
3164
3165 /* Send all streams to application. */
3166 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
3167 struct buffer_reg_stream *reg_stream;
3168
3169 ret = buffer_reg_stream_create(&reg_stream);
3170 if (ret < 0) {
3171 goto error;
3172 }
3173
3174 /*
3175 * Keep original pointer and nullify it in the stream so the delete
3176 * stream call does not release the object.
3177 */
3178 reg_stream->obj.ust = stream->obj;
3179 stream->obj = NULL;
3273699d 3180 buffer_reg_stream_add(reg_stream, buf_reg_chan);
421cb601 3181
7972aab2
DG
3182 /* We don't need the streams anymore. */
3183 cds_list_del(&stream->list);
fb45065e 3184 delete_ust_app_stream(-1, stream, app);
7972aab2 3185 }
421cb601 3186
7972aab2
DG
3187error:
3188 return ret;
3189}
3190
3191/*
3192 * Create a buffer registry channel for the given session registry and
3193 * application channel object. If regp pointer is valid, it's set with the
3194 * created object. Important, the created object is NOT added to the session
3195 * registry hash table.
3196 *
3197 * Return 0 on success else a negative value.
3198 */
3199static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess,
3200 struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp)
3201{
3202 int ret;
3273699d 3203 struct buffer_reg_channel *buf_reg_chan = NULL;
7972aab2 3204
a0377dfe
FD
3205 LTTNG_ASSERT(reg_sess);
3206 LTTNG_ASSERT(ua_chan);
7972aab2
DG
3207
3208 DBG2("UST app creating buffer registry channel for %s", ua_chan->name);
3209
3210 /* Create buffer registry channel. */
3273699d 3211 ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, &buf_reg_chan);
7972aab2
DG
3212 if (ret < 0) {
3213 goto error_create;
421cb601 3214 }
a0377dfe 3215 LTTNG_ASSERT(buf_reg_chan);
3273699d
FD
3216 buf_reg_chan->consumer_key = ua_chan->key;
3217 buf_reg_chan->subbuf_size = ua_chan->attr.subbuf_size;
3218 buf_reg_chan->num_subbuf = ua_chan->attr.num_subbuf;
421cb601 3219
7972aab2
DG
3220 /* Create and add a channel registry to session. */
3221 ret = ust_registry_channel_add(reg_sess->reg.ust,
3222 ua_chan->tracing_channel_id);
3223 if (ret < 0) {
3224 goto error;
d88aee68 3225 }
3273699d 3226 buffer_reg_channel_add(reg_sess, buf_reg_chan);
d88aee68 3227
7972aab2 3228 if (regp) {
3273699d 3229 *regp = buf_reg_chan;
3d8ca23b 3230 }
d88aee68 3231
7972aab2 3232 return 0;
3d8ca23b
DG
3233
3234error:
7972aab2 3235 /* Safe because the registry channel object was not added to any HT. */
3273699d 3236 buffer_reg_channel_destroy(buf_reg_chan, LTTNG_DOMAIN_UST);
7972aab2 3237error_create:
3d8ca23b 3238 return ret;
421cb601
DG
3239}
3240
55cc08a6 3241/*
7972aab2
DG
3242 * Setup buffer registry channel for the given session registry and application
3243 * channel object. If regp pointer is valid, it's set with the created object.
d0b96690 3244 *
7972aab2 3245 * Return 0 on success else a negative value.
55cc08a6 3246 */
7972aab2 3247static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess,
3273699d 3248 struct ust_app_channel *ua_chan, struct buffer_reg_channel *buf_reg_chan,
fb45065e 3249 struct ust_app *app)
55cc08a6 3250{
7972aab2 3251 int ret;
55cc08a6 3252
a0377dfe
FD
3253 LTTNG_ASSERT(reg_sess);
3254 LTTNG_ASSERT(buf_reg_chan);
3255 LTTNG_ASSERT(ua_chan);
3256 LTTNG_ASSERT(ua_chan->obj);
55cc08a6 3257
7972aab2 3258 DBG2("UST app setup buffer registry channel for %s", ua_chan->name);
55cc08a6 3259
7972aab2 3260 /* Setup all streams for the registry. */
3273699d 3261 ret = setup_buffer_reg_streams(buf_reg_chan, ua_chan, app);
7972aab2 3262 if (ret < 0) {
55cc08a6
DG
3263 goto error;
3264 }
3265
3273699d 3266 buf_reg_chan->obj.ust = ua_chan->obj;
7972aab2 3267 ua_chan->obj = NULL;
55cc08a6 3268
7972aab2 3269 return 0;
55cc08a6
DG
3270
3271error:
3273699d
FD
3272 buffer_reg_channel_remove(reg_sess, buf_reg_chan);
3273 buffer_reg_channel_destroy(buf_reg_chan, LTTNG_DOMAIN_UST);
55cc08a6
DG
3274 return ret;
3275}
3276
edb67388 3277/*
7972aab2 3278 * Send buffer registry channel to the application.
d0b96690 3279 *
7972aab2 3280 * Return 0 on success else a negative value.
edb67388 3281 */
3273699d 3282static int send_channel_uid_to_ust(struct buffer_reg_channel *buf_reg_chan,
7972aab2
DG
3283 struct ust_app *app, struct ust_app_session *ua_sess,
3284 struct ust_app_channel *ua_chan)
edb67388
DG
3285{
3286 int ret;
7972aab2 3287 struct buffer_reg_stream *reg_stream;
edb67388 3288
a0377dfe
FD
3289 LTTNG_ASSERT(buf_reg_chan);
3290 LTTNG_ASSERT(app);
3291 LTTNG_ASSERT(ua_sess);
3292 LTTNG_ASSERT(ua_chan);
7972aab2
DG
3293
3294 DBG("UST app sending buffer registry channel to ust sock %d", app->sock);
3295
3273699d 3296 ret = duplicate_channel_object(buf_reg_chan, ua_chan);
edb67388
DG
3297 if (ret < 0) {
3298 goto error;
3299 }
3300
7972aab2
DG
3301 /* Send channel to the application. */
3302 ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
a7169585
MD
3303 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
3304 ret = -ENOTCONN; /* Caused by app exiting. */
3305 goto error;
be355079
JR
3306 } else if (ret == -EAGAIN) {
3307 /* Caused by timeout. */
3308 WARN("Communication with application %d timed out on send_channel for channel \"%s\" of session \"%" PRIu64 "\".",
3309 app->pid, ua_chan->name, ua_sess->tracing_id);
3310 /* Treat this the same way as an application that is exiting. */
3311 ret = -ENOTCONN;
3312 goto error;
a7169585 3313 } else if (ret < 0) {
7972aab2
DG
3314 goto error;
3315 }
3316
3317 health_code_update();
3318
3319 /* Send all streams to application. */
3273699d
FD
3320 pthread_mutex_lock(&buf_reg_chan->stream_list_lock);
3321 cds_list_for_each_entry(reg_stream, &buf_reg_chan->streams, lnode) {
9ee61e74 3322 struct ust_app_stream stream = {};
7972aab2
DG
3323
3324 ret = duplicate_stream_object(reg_stream, &stream);
3325 if (ret < 0) {
3326 goto error_stream_unlock;
3327 }
3328
3329 ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream);
3330 if (ret < 0) {
a7169585
MD
3331 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
3332 ret = -ENOTCONN; /* Caused by app exiting. */
be355079
JR
3333 } else if (ret == -EAGAIN) {
3334 /*
3335 * Caused by timeout.
3336 * Treat this the same way as an application
3337 * that is exiting.
3338 */
9ee61e74
JG
3339 WARN("Communication with application %d timed out on send_stream for stream of channel \"%s\" of session \"%" PRIu64 "\".",
3340 app->pid,
be355079
JR
3341 ua_chan->name,
3342 ua_sess->tracing_id);
3343 ret = -ENOTCONN;
a7169585 3344 }
be355079 3345 (void) release_ust_app_stream(-1, &stream, app);
7972aab2
DG
3346 goto error_stream_unlock;
3347 }
edb67388 3348
7972aab2
DG
3349 /*
3350 * The return value is not important here. This function will output an
3351 * error if needed.
3352 */
fb45065e 3353 (void) release_ust_app_stream(-1, &stream, app);
7972aab2
DG
3354 }
3355 ua_chan->is_sent = 1;
3356
3357error_stream_unlock:
3273699d 3358 pthread_mutex_unlock(&buf_reg_chan->stream_list_lock);
edb67388
DG
3359error:
3360 return ret;
3361}
3362
9730260e 3363/*
7972aab2
DG
3364 * Create and send to the application the created buffers with per UID buffers.
3365 *
9acdc1d6 3366 * This MUST be called with a RCU read side lock acquired.
71e0a100 3367 * The session list lock and the session's lock must be acquired.
9acdc1d6 3368 *
7972aab2 3369 * Return 0 on success else a negative value.
9730260e 3370 */
7972aab2
DG
3371static int create_channel_per_uid(struct ust_app *app,
3372 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
3373 struct ust_app_channel *ua_chan)
9730260e
DG
3374{
3375 int ret;
7972aab2 3376 struct buffer_reg_uid *reg_uid;
3273699d 3377 struct buffer_reg_channel *buf_reg_chan;
e32d7f27 3378 struct ltt_session *session = NULL;
e098433c 3379 enum lttng_error_code notification_ret;
3273699d 3380 struct ust_registry_channel *ust_reg_chan;
9730260e 3381
a0377dfe
FD
3382 LTTNG_ASSERT(app);
3383 LTTNG_ASSERT(usess);
3384 LTTNG_ASSERT(ua_sess);
3385 LTTNG_ASSERT(ua_chan);
48b7cdc2 3386 ASSERT_RCU_READ_LOCKED();
7972aab2
DG
3387
3388 DBG("UST app creating channel %s with per UID buffers", ua_chan->name);
3389
3390 reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid);
3391 /*
3392 * The session creation handles the creation of this global registry
3393 * object. If none can be find, there is a code flow problem or a
3394 * teardown race.
3395 */
a0377dfe 3396 LTTNG_ASSERT(reg_uid);
7972aab2 3397
3273699d 3398 buf_reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id,
7972aab2 3399 reg_uid);
3273699d 3400 if (buf_reg_chan) {
2721f7ea
JG
3401 goto send_channel;
3402 }
7972aab2 3403
2721f7ea 3404 /* Create the buffer registry channel object. */
3273699d 3405 ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, &buf_reg_chan);
2721f7ea
JG
3406 if (ret < 0) {
3407 ERR("Error creating the UST channel \"%s\" registry instance",
f14256d6 3408 ua_chan->name);
2721f7ea
JG
3409 goto error;
3410 }
f14256d6 3411
e098433c 3412 session = session_find_by_id(ua_sess->tracing_id);
a0377dfe
FD
3413 LTTNG_ASSERT(session);
3414 LTTNG_ASSERT(pthread_mutex_trylock(&session->lock));
3415 LTTNG_ASSERT(session_trylock_list());
e098433c 3416
2721f7ea
JG
3417 /*
3418 * Create the buffers on the consumer side. This call populates the
3419 * ust app channel object with all streams and data object.
3420 */
3421 ret = do_consumer_create_channel(usess, ua_sess, ua_chan,
f46376a1 3422 app->bits_per_long, reg_uid->registry->reg.ust);
2721f7ea
JG
3423 if (ret < 0) {
3424 ERR("Error creating UST channel \"%s\" on the consumer daemon",
3425 ua_chan->name);
7972aab2
DG
3426
3427 /*
2721f7ea
JG
3428 * Let's remove the previously created buffer registry channel so
3429 * it's not visible anymore in the session registry.
7972aab2 3430 */
2721f7ea
JG
3431 ust_registry_channel_del_free(reg_uid->registry->reg.ust,
3432 ua_chan->tracing_channel_id, false);
3273699d
FD
3433 buffer_reg_channel_remove(reg_uid->registry, buf_reg_chan);
3434 buffer_reg_channel_destroy(buf_reg_chan, LTTNG_DOMAIN_UST);
2721f7ea 3435 goto error;
7972aab2
DG
3436 }
3437
2721f7ea
JG
3438 /*
3439 * Setup the streams and add it to the session registry.
3440 */
3441 ret = setup_buffer_reg_channel(reg_uid->registry,
3273699d 3442 ua_chan, buf_reg_chan, app);
2721f7ea
JG
3443 if (ret < 0) {
3444 ERR("Error setting up UST channel \"%s\"", ua_chan->name);
3445 goto error;
3446 }
3447
e098433c
JG
3448 /* Notify the notification subsystem of the channel's creation. */
3449 pthread_mutex_lock(&reg_uid->registry->reg.ust->lock);
3273699d 3450 ust_reg_chan = ust_registry_channel_find(reg_uid->registry->reg.ust,
e098433c 3451 ua_chan->tracing_channel_id);
a0377dfe 3452 LTTNG_ASSERT(ust_reg_chan);
3273699d
FD
3453 ust_reg_chan->consumer_key = ua_chan->key;
3454 ust_reg_chan = NULL;
e098433c 3455 pthread_mutex_unlock(&reg_uid->registry->reg.ust->lock);
e9404c27 3456
e098433c 3457 notification_ret = notification_thread_command_add_channel(
412d7227
SM
3458 the_notification_thread_handle, session->name,
3459 lttng_credentials_get_uid(
3460 &ua_sess->effective_credentials),
3461 lttng_credentials_get_gid(
3462 &ua_sess->effective_credentials),
3463 ua_chan->name, ua_chan->key, LTTNG_DOMAIN_UST,
e098433c
JG
3464 ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf);
3465 if (notification_ret != LTTNG_OK) {
3466 ret = - (int) notification_ret;
3467 ERR("Failed to add channel to notification thread");
3468 goto error;
e9404c27
JG
3469 }
3470
2721f7ea 3471send_channel:
66ff8e3f 3472 /* Send buffers to the application. */
3273699d 3473 ret = send_channel_uid_to_ust(buf_reg_chan, app, ua_sess, ua_chan);
66ff8e3f
JG
3474 if (ret < 0) {
3475 if (ret != -ENOTCONN) {
3476 ERR("Error sending channel to application");
3477 }
3478 goto error;
3479 }
3480
9730260e 3481error:
e32d7f27
JG
3482 if (session) {
3483 session_put(session);
3484 }
9730260e
DG
3485 return ret;
3486}
3487
78f0bacd 3488/*
7972aab2
DG
3489 * Create and send to the application the created buffers with per PID buffers.
3490 *
fad1ed2f 3491 * Called with UST app session lock held.
71e0a100 3492 * The session list lock and the session's lock must be acquired.
fad1ed2f 3493 *
7972aab2 3494 * Return 0 on success else a negative value.
78f0bacd 3495 */
7972aab2
DG
3496static int create_channel_per_pid(struct ust_app *app,
3497 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
3498 struct ust_app_channel *ua_chan)
78f0bacd 3499{
8535a6d9 3500 int ret;
7972aab2 3501 struct ust_registry_session *registry;
e9404c27 3502 enum lttng_error_code cmd_ret;
e32d7f27 3503 struct ltt_session *session = NULL;
e9404c27 3504 uint64_t chan_reg_key;
3273699d 3505 struct ust_registry_channel *ust_reg_chan;
78f0bacd 3506
a0377dfe
FD
3507 LTTNG_ASSERT(app);
3508 LTTNG_ASSERT(usess);
3509 LTTNG_ASSERT(ua_sess);
3510 LTTNG_ASSERT(ua_chan);
7972aab2
DG
3511
3512 DBG("UST app creating channel %s with per PID buffers", ua_chan->name);
3513
3514 rcu_read_lock();
3515
3516 registry = get_session_registry(ua_sess);
fad1ed2f 3517 /* The UST app session lock is held, registry shall not be null. */
a0377dfe 3518 LTTNG_ASSERT(registry);
7972aab2
DG
3519
3520 /* Create and add a new channel registry to session. */
3521 ret = ust_registry_channel_add(registry, ua_chan->key);
78f0bacd 3522 if (ret < 0) {
f14256d6
MD
3523 ERR("Error creating the UST channel \"%s\" registry instance",
3524 ua_chan->name);
78f0bacd
DG
3525 goto error;
3526 }
3527
e098433c 3528 session = session_find_by_id(ua_sess->tracing_id);
a0377dfe 3529 LTTNG_ASSERT(session);
e098433c 3530
a0377dfe
FD
3531 LTTNG_ASSERT(pthread_mutex_trylock(&session->lock));
3532 LTTNG_ASSERT(session_trylock_list());
e098433c 3533
7972aab2
DG
3534 /* Create and get channel on the consumer side. */
3535 ret = do_consumer_create_channel(usess, ua_sess, ua_chan,
f46376a1 3536 app->bits_per_long, registry);
7972aab2 3537 if (ret < 0) {
f14256d6
MD
3538 ERR("Error creating UST channel \"%s\" on the consumer daemon",
3539 ua_chan->name);
5b951542 3540 goto error_remove_from_registry;
7972aab2
DG
3541 }
3542
3543 ret = send_channel_pid_to_ust(app, ua_sess, ua_chan);
3544 if (ret < 0) {
a7169585
MD
3545 if (ret != -ENOTCONN) {
3546 ERR("Error sending channel to application");
3547 }
5b951542 3548 goto error_remove_from_registry;
7972aab2 3549 }
8535a6d9 3550
e9404c27
JG
3551 chan_reg_key = ua_chan->key;
3552 pthread_mutex_lock(&registry->lock);
3273699d 3553 ust_reg_chan = ust_registry_channel_find(registry, chan_reg_key);
a0377dfe 3554 LTTNG_ASSERT(ust_reg_chan);
3273699d 3555 ust_reg_chan->consumer_key = ua_chan->key;
e9404c27
JG
3556 pthread_mutex_unlock(&registry->lock);
3557
3558 cmd_ret = notification_thread_command_add_channel(
412d7227
SM
3559 the_notification_thread_handle, session->name,
3560 lttng_credentials_get_uid(
3561 &ua_sess->effective_credentials),
3562 lttng_credentials_get_gid(
3563 &ua_sess->effective_credentials),
3564 ua_chan->name, ua_chan->key, LTTNG_DOMAIN_UST,
e9404c27
JG
3565 ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf);
3566 if (cmd_ret != LTTNG_OK) {
3567 ret = - (int) cmd_ret;
3568 ERR("Failed to add channel to notification thread");
5b951542 3569 goto error_remove_from_registry;
e9404c27
JG
3570 }
3571
5b951542
MD
3572error_remove_from_registry:
3573 if (ret) {
3574 ust_registry_channel_del_free(registry, ua_chan->key, false);
3575 }
78f0bacd 3576error:
7972aab2 3577 rcu_read_unlock();
e32d7f27
JG
3578 if (session) {
3579 session_put(session);
3580 }
78f0bacd
DG
3581 return ret;
3582}
3583
3584/*
7972aab2 3585 * From an already allocated ust app channel, create the channel buffers if
88e3c2f5 3586 * needed and send them to the application. This MUST be called with a RCU read
7972aab2
DG
3587 * side lock acquired.
3588 *
fad1ed2f
JR
3589 * Called with UST app session lock held.
3590 *
a7169585
MD
3591 * Return 0 on success or else a negative value. Returns -ENOTCONN if
3592 * the application exited concurrently.
78f0bacd 3593 */
88e3c2f5 3594static int ust_app_channel_send(struct ust_app *app,
7972aab2
DG
3595 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
3596 struct ust_app_channel *ua_chan)
78f0bacd 3597{
7972aab2 3598 int ret;
78f0bacd 3599
a0377dfe
FD
3600 LTTNG_ASSERT(app);
3601 LTTNG_ASSERT(usess);
3602 LTTNG_ASSERT(usess->active);
3603 LTTNG_ASSERT(ua_sess);
3604 LTTNG_ASSERT(ua_chan);
48b7cdc2 3605 ASSERT_RCU_READ_LOCKED();
7972aab2
DG
3606
3607 /* Handle buffer type before sending the channel to the application. */
3608 switch (usess->buffer_type) {
3609 case LTTNG_BUFFER_PER_UID:
3610 {
3611 ret = create_channel_per_uid(app, usess, ua_sess, ua_chan);
3612 if (ret < 0) {
3613 goto error;
3614 }
3615 break;
3616 }
3617 case LTTNG_BUFFER_PER_PID:
3618 {
3619 ret = create_channel_per_pid(app, usess, ua_sess, ua_chan);
3620 if (ret < 0) {
3621 goto error;
3622 }
3623 break;
3624 }
3625 default:
a0377dfe 3626 abort();
7972aab2 3627 ret = -EINVAL;
78f0bacd
DG
3628 goto error;
3629 }
3630
7972aab2
DG
3631 /* Initialize ust objd object using the received handle and add it. */
3632 lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle);
3633 lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node);
78f0bacd 3634
7972aab2
DG
3635 /* If channel is not enabled, disable it on the tracer */
3636 if (!ua_chan->enabled) {
3637 ret = disable_ust_channel(app, ua_sess, ua_chan);
3638 if (ret < 0) {
3639 goto error;
3640 }
78f0bacd
DG
3641 }
3642
3643error:
3644 return ret;
3645}
3646
284d8f55 3647/*
88e3c2f5 3648 * Create UST app channel and return it through ua_chanp if not NULL.
d0b96690 3649 *
36b588ed 3650 * Called with UST app session lock and RCU read-side lock held.
7972aab2 3651 *
88e3c2f5 3652 * Return 0 on success or else a negative value.
284d8f55 3653 */
88e3c2f5
JG
3654static int ust_app_channel_allocate(struct ust_app_session *ua_sess,
3655 struct ltt_ust_channel *uchan,
f46376a1
MJ
3656 enum lttng_ust_abi_chan_type type,
3657 struct ltt_ust_session *usess __attribute__((unused)),
4d710ac2 3658 struct ust_app_channel **ua_chanp)
5b4a0ec0
DG
3659{
3660 int ret = 0;
bec39940
DG
3661 struct lttng_ht_iter iter;
3662 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
3663 struct ust_app_channel *ua_chan;
3664
48b7cdc2
FD
3665 ASSERT_RCU_READ_LOCKED();
3666
5b4a0ec0 3667 /* Lookup channel in the ust app session */
bec39940
DG
3668 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
3669 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
fc34caaa 3670 if (ua_chan_node != NULL) {
5b4a0ec0 3671 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
fc34caaa 3672 goto end;
5b4a0ec0
DG
3673 }
3674
d0b96690 3675 ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr);
fc34caaa
DG
3676 if (ua_chan == NULL) {
3677 /* Only malloc can fail here */
4d710ac2 3678 ret = -ENOMEM;
88e3c2f5 3679 goto error;
fc34caaa
DG
3680 }
3681 shadow_copy_channel(ua_chan, uchan);
3682
ffe60014
DG
3683 /* Set channel type. */
3684 ua_chan->attr.type = type;
3685
d0b96690
DG
3686 /* Only add the channel if successful on the tracer side. */
3687 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
fc34caaa 3688end:
4d710ac2
DG
3689 if (ua_chanp) {
3690 *ua_chanp = ua_chan;
3691 }
3692
3693 /* Everything went well. */
3694 return 0;
5b4a0ec0
DG
3695
3696error:
4d710ac2 3697 return ret;
5b4a0ec0
DG
3698}
3699
3700/*
3701 * Create UST app event and create it on the tracer side.
d0b96690 3702 *
993578ff 3703 * Must be called with the RCU read side lock held.
d0b96690 3704 * Called with ust app session mutex held.
5b4a0ec0 3705 */
edb67388 3706static
f46376a1
MJ
3707int create_ust_app_event(struct ust_app_channel *ua_chan,
3708 struct ltt_ust_event *uevent,
edb67388 3709 struct ust_app *app)
284d8f55 3710{
edb67388 3711 int ret = 0;
5b4a0ec0 3712 struct ust_app_event *ua_event;
284d8f55 3713
48b7cdc2
FD
3714 ASSERT_RCU_READ_LOCKED();
3715
edb67388
DG
3716 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
3717 if (ua_event == NULL) {
20533947 3718 /* Only failure mode of alloc_ust_app_event(). */
edb67388 3719 ret = -ENOMEM;
fc34caaa 3720 goto end;
5b4a0ec0 3721 }
edb67388 3722 shadow_copy_event(ua_event, uevent);
5b4a0ec0 3723
edb67388 3724 /* Create it on the tracer side */
f46376a1 3725 ret = create_ust_event(app, ua_chan, ua_event);
284d8f55 3726 if (ret < 0) {
e9f11505
JG
3727 /*
3728 * Not found previously means that it does not exist on the
3729 * tracer. If the application reports that the event existed,
3730 * it means there is a bug in the sessiond or lttng-ust
3731 * (or corruption, etc.)
3732 */
3733 if (ret == -LTTNG_UST_ERR_EXIST) {
3734 ERR("Tracer for application reported that an event being created already existed: "
3735 "event_name = \"%s\", pid = %d, ppid = %d, uid = %d, gid = %d",
3736 uevent->attr.name,
3737 app->pid, app->ppid, app->uid,
3738 app->gid);
3739 }
284d8f55
DG
3740 goto error;
3741 }
3742
d0b96690 3743 add_unique_ust_app_event(ua_chan, ua_event);
284d8f55 3744
be355079
JR
3745 DBG2("UST app create event completed: app = '%s' pid = %d",
3746 app->name, app->pid);
7f79d3a1 3747
edb67388 3748end:
fc34caaa
DG
3749 return ret;
3750
5b4a0ec0 3751error:
fc34caaa 3752 /* Valid. Calling here is already in a read side lock */
fb45065e 3753 delete_ust_app_event(-1, ua_event, app);
edb67388 3754 return ret;
5b4a0ec0
DG
3755}
3756
993578ff
JR
3757/*
3758 * Create UST app event notifier rule and create it on the tracer side.
3759 *
3760 * Must be called with the RCU read side lock held.
3761 * Called with ust app session mutex held.
3762 */
3763static
267d66aa
JR
3764int create_ust_app_event_notifier_rule(struct lttng_trigger *trigger,
3765 struct ust_app *app)
993578ff
JR
3766{
3767 int ret = 0;
3768 struct ust_app_event_notifier_rule *ua_event_notifier_rule;
3769
48b7cdc2
FD
3770 ASSERT_RCU_READ_LOCKED();
3771
267d66aa 3772 ua_event_notifier_rule = alloc_ust_app_event_notifier_rule(trigger);
993578ff
JR
3773 if (ua_event_notifier_rule == NULL) {
3774 ret = -ENOMEM;
3775 goto end;
3776 }
3777
3778 /* Create it on the tracer side. */
3779 ret = create_ust_event_notifier(app, ua_event_notifier_rule);
3780 if (ret < 0) {
3781 /*
3782 * Not found previously means that it does not exist on the
3783 * tracer. If the application reports that the event existed,
3784 * it means there is a bug in the sessiond or lttng-ust
3785 * (or corruption, etc.)
3786 */
3787 if (ret == -LTTNG_UST_ERR_EXIST) {
3788 ERR("Tracer for application reported that an event notifier being created already exists: "
3789 "token = \"%" PRIu64 "\", pid = %d, ppid = %d, uid = %d, gid = %d",
267d66aa 3790 lttng_trigger_get_tracer_token(trigger),
993578ff
JR
3791 app->pid, app->ppid, app->uid,
3792 app->gid);
3793 }
3794 goto error;
3795 }
3796
3797 lttng_ht_add_unique_u64(app->token_to_event_notifier_rule_ht,
3798 &ua_event_notifier_rule->node);
3799
9324443a 3800 DBG2("UST app create token event rule completed: app = '%s', pid = %d, token = %" PRIu64,
be355079 3801 app->name, app->pid, lttng_trigger_get_tracer_token(trigger));
993578ff 3802
533a90fb 3803 goto end;
993578ff
JR
3804
3805error:
3806 /* The RCU read side lock is already being held by the caller. */
3807 delete_ust_app_event_notifier_rule(-1, ua_event_notifier_rule, app);
533a90fb 3808end:
993578ff
JR
3809 return ret;
3810}
3811
5b4a0ec0
DG
3812/*
3813 * Create UST metadata and open it on the tracer side.
d0b96690 3814 *
7972aab2 3815 * Called with UST app session lock held and RCU read side lock.
5b4a0ec0
DG
3816 */
3817static int create_ust_app_metadata(struct ust_app_session *ua_sess,
ad7a9107 3818 struct ust_app *app, struct consumer_output *consumer)
5b4a0ec0
DG
3819{
3820 int ret = 0;
ffe60014 3821 struct ust_app_channel *metadata;
d88aee68 3822 struct consumer_socket *socket;
7972aab2 3823 struct ust_registry_session *registry;
e32d7f27 3824 struct ltt_session *session = NULL;
5b4a0ec0 3825
a0377dfe
FD
3826 LTTNG_ASSERT(ua_sess);
3827 LTTNG_ASSERT(app);
3828 LTTNG_ASSERT(consumer);
48b7cdc2 3829 ASSERT_RCU_READ_LOCKED();
5b4a0ec0 3830
7972aab2 3831 registry = get_session_registry(ua_sess);
fad1ed2f 3832 /* The UST app session is held registry shall not be null. */
a0377dfe 3833 LTTNG_ASSERT(registry);
7972aab2 3834
ce34fcd0
MD
3835 pthread_mutex_lock(&registry->lock);
3836
1b532a60
DG
3837 /* Metadata already exists for this registry or it was closed previously */
3838 if (registry->metadata_key || registry->metadata_closed) {
7972aab2
DG
3839 ret = 0;
3840 goto error;
5b4a0ec0
DG
3841 }
3842
ffe60014 3843 /* Allocate UST metadata */
d0b96690 3844 metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL);
ffe60014
DG
3845 if (!metadata) {
3846 /* malloc() failed */
3847 ret = -ENOMEM;
3848 goto error;
3849 }
5b4a0ec0 3850
ad7a9107 3851 memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr));
5b4a0ec0 3852
7972aab2
DG
3853 /* Need one fd for the channel. */
3854 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
3855 if (ret < 0) {
3856 ERR("Exhausted number of available FD upon create metadata");
3857 goto error;
3858 }
3859
4dc3dfc5
DG
3860 /* Get the right consumer socket for the application. */
3861 socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer);
3862 if (!socket) {
3863 ret = -EINVAL;
3864 goto error_consumer;
3865 }
3866
331744e3
JD
3867 /*
3868 * Keep metadata key so we can identify it on the consumer side. Assign it
3869 * to the registry *before* we ask the consumer so we avoid the race of the
3870 * consumer requesting the metadata and the ask_channel call on our side
3871 * did not returned yet.
3872 */
3873 registry->metadata_key = metadata->key;
3874
e098433c 3875 session = session_find_by_id(ua_sess->tracing_id);
a0377dfe 3876 LTTNG_ASSERT(session);
e098433c 3877
a0377dfe
FD
3878 LTTNG_ASSERT(pthread_mutex_trylock(&session->lock));
3879 LTTNG_ASSERT(session_trylock_list());
e098433c 3880
d88aee68
DG
3881 /*
3882 * Ask the metadata channel creation to the consumer. The metadata object
3883 * will be created by the consumer and kept their. However, the stream is
3884 * never added or monitored until we do a first push metadata to the
3885 * consumer.
3886 */
7972aab2 3887 ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket,
d2956687 3888 registry, session->current_trace_chunk);
d88aee68 3889 if (ret < 0) {
f2a444f1
DG
3890 /* Nullify the metadata key so we don't try to close it later on. */
3891 registry->metadata_key = 0;
d88aee68
DG
3892 goto error_consumer;
3893 }
3894
3895 /*
3896 * The setup command will make the metadata stream be sent to the relayd,
3897 * if applicable, and the thread managing the metadatas. This is important
3898 * because after this point, if an error occurs, the only way the stream
3899 * can be deleted is to be monitored in the consumer.
3900 */
7972aab2 3901 ret = consumer_setup_metadata(socket, metadata->key);
ffe60014 3902 if (ret < 0) {
f2a444f1
DG
3903 /* Nullify the metadata key so we don't try to close it later on. */
3904 registry->metadata_key = 0;
d88aee68 3905 goto error_consumer;
5b4a0ec0
DG
3906 }
3907
7972aab2
DG
3908 DBG2("UST metadata with key %" PRIu64 " created for app pid %d",
3909 metadata->key, app->pid);
5b4a0ec0 3910
d88aee68 3911error_consumer:
b80f0b6c 3912 lttng_fd_put(LTTNG_FD_APPS, 1);
d88aee68 3913 delete_ust_app_channel(-1, metadata, app);
5b4a0ec0 3914error:
ce34fcd0 3915 pthread_mutex_unlock(&registry->lock);
e32d7f27
JG
3916 if (session) {
3917 session_put(session);
3918 }
ffe60014 3919 return ret;
5b4a0ec0
DG
3920}
3921
5b4a0ec0 3922/*
d88aee68
DG
3923 * Return ust app pointer or NULL if not found. RCU read side lock MUST be
3924 * acquired before calling this function.
5b4a0ec0
DG
3925 */
3926struct ust_app *ust_app_find_by_pid(pid_t pid)
3927{
d88aee68 3928 struct ust_app *app = NULL;
bec39940
DG
3929 struct lttng_ht_node_ulong *node;
3930 struct lttng_ht_iter iter;
5b4a0ec0 3931
bec39940
DG
3932 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
3933 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
3934 if (node == NULL) {
3935 DBG2("UST app no found with pid %d", pid);
3936 goto error;
3937 }
5b4a0ec0
DG
3938
3939 DBG2("Found UST app by pid %d", pid);
3940
d88aee68 3941 app = caa_container_of(node, struct ust_app, pid_n);
5b4a0ec0
DG
3942
3943error:
d88aee68 3944 return app;
5b4a0ec0
DG
3945}
3946
d88aee68
DG
3947/*
3948 * Allocate and init an UST app object using the registration information and
3949 * the command socket. This is called when the command socket connects to the
3950 * session daemon.
3951 *
3952 * The object is returned on success or else NULL.
3953 */
d0b96690 3954struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock)
5b4a0ec0 3955{
5e2abfaf 3956 int ret;
d0b96690 3957 struct ust_app *lta = NULL;
da873412 3958 struct lttng_pipe *event_notifier_event_source_pipe = NULL;
d0b96690 3959
a0377dfe
FD
3960 LTTNG_ASSERT(msg);
3961 LTTNG_ASSERT(sock >= 0);
d0b96690
DG
3962
3963 DBG3("UST app creating application for socket %d", sock);
5b4a0ec0 3964
173af62f 3965 if ((msg->bits_per_long == 64 &&
412d7227
SM
3966 (uatomic_read(&the_ust_consumerd64_fd) ==
3967 -EINVAL)) ||
3968 (msg->bits_per_long == 32 &&
3969 (uatomic_read(&the_ust_consumerd32_fd) ==
3970 -EINVAL))) {
f943b0fb 3971 ERR("Registration failed: application \"%s\" (pid: %d) has "
d0b96690
DG
3972 "%d-bit long, but no consumerd for this size is available.\n",
3973 msg->name, msg->pid, msg->bits_per_long);
3974 goto error;
3f2c5fcc 3975 }
d0b96690 3976
5e2abfaf
JG
3977 /*
3978 * Reserve the two file descriptors of the event source pipe. The write
3979 * end will be closed once it is passed to the application, at which
3980 * point a single 'put' will be performed.
3981 */
3982 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
3983 if (ret) {
be355079
JR
3984 ERR("Failed to reserve two file descriptors for the event source pipe while creating a new application instance: app = '%s', pid = %d",
3985 msg->name, (int) msg->pid);
5e2abfaf
JG
3986 goto error;
3987 }
3988
da873412
JR
3989 event_notifier_event_source_pipe = lttng_pipe_open(FD_CLOEXEC);
3990 if (!event_notifier_event_source_pipe) {
be355079
JR
3991 PERROR("Failed to open application event source pipe: '%s' (pid = %d)",
3992 msg->name, msg->pid);
da873412
JR
3993 goto error;
3994 }
3995
64803277 3996 lta = zmalloc<ust_app>();
5b4a0ec0
DG
3997 if (lta == NULL) {
3998 PERROR("malloc");
da873412 3999 goto error_free_pipe;
5b4a0ec0
DG
4000 }
4001
da873412
JR
4002 lta->event_notifier_group.event_pipe = event_notifier_event_source_pipe;
4003
5b4a0ec0
DG
4004 lta->ppid = msg->ppid;
4005 lta->uid = msg->uid;
4006 lta->gid = msg->gid;
d0b96690 4007
7753dea8 4008 lta->bits_per_long = msg->bits_per_long;
d0b96690
DG
4009 lta->uint8_t_alignment = msg->uint8_t_alignment;
4010 lta->uint16_t_alignment = msg->uint16_t_alignment;
4011 lta->uint32_t_alignment = msg->uint32_t_alignment;
4012 lta->uint64_t_alignment = msg->uint64_t_alignment;
4013 lta->long_alignment = msg->long_alignment;
4014 lta->byte_order = msg->byte_order;
4015
5b4a0ec0
DG
4016 lta->v_major = msg->major;
4017 lta->v_minor = msg->minor;
d9bf3ca4 4018 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
d0b96690 4019 lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
10b56aef 4020 lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
d0b96690 4021 lta->notify_sock = -1;
993578ff 4022 lta->token_to_event_notifier_rule_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
d88aee68
DG
4023
4024 /* Copy name and make sure it's NULL terminated. */
4025 strncpy(lta->name, msg->name, sizeof(lta->name));
4026 lta->name[UST_APP_PROCNAME_LEN] = '\0';
4027
4028 /*
4029 * Before this can be called, when receiving the registration information,
4030 * the application compatibility is checked. So, at this point, the
4031 * application can work with this session daemon.
4032 */
d0b96690 4033 lta->compatible = 1;
5b4a0ec0 4034
852d0037 4035 lta->pid = msg->pid;
d0b96690 4036 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long) lta->pid);
852d0037 4037 lta->sock = sock;
fb45065e 4038 pthread_mutex_init(&lta->sock_lock, NULL);
d0b96690 4039 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long) lta->sock);
5b4a0ec0 4040
d42f20df 4041 CDS_INIT_LIST_HEAD(&lta->teardown_head);
d0b96690 4042 return lta;
da873412
JR
4043
4044error_free_pipe:
4045 lttng_pipe_destroy(event_notifier_event_source_pipe);
5e2abfaf 4046 lttng_fd_put(LTTNG_FD_APPS, 2);
da873412
JR
4047error:
4048 return NULL;
d0b96690
DG
4049}
4050
d88aee68
DG
4051/*
4052 * For a given application object, add it to every hash table.
4053 */
d0b96690
DG
4054void ust_app_add(struct ust_app *app)
4055{
a0377dfe
FD
4056 LTTNG_ASSERT(app);
4057 LTTNG_ASSERT(app->notify_sock >= 0);
d0b96690 4058
940c4592
JR
4059 app->registration_time = time(NULL);
4060
5b4a0ec0 4061 rcu_read_lock();
852d0037
DG
4062
4063 /*
4064 * On a re-registration, we want to kick out the previous registration of
4065 * that pid
4066 */
d0b96690 4067 lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n);
852d0037
DG
4068
4069 /*
4070 * The socket _should_ be unique until _we_ call close. So, a add_unique
4071 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
4072 * already in the table.
4073 */
d0b96690 4074 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n);
852d0037 4075
d0b96690
DG
4076 /* Add application to the notify socket hash table. */
4077 lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock);
4078 lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n);
5b4a0ec0 4079
be355079
JR
4080 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock =%d name:%s "
4081 "notify_sock =%d (version %d.%d)", app->pid, app->ppid, app->uid,
d88aee68
DG
4082 app->gid, app->sock, app->name, app->notify_sock, app->v_major,
4083 app->v_minor);
5b4a0ec0 4084
d0b96690
DG
4085 rcu_read_unlock();
4086}
4087
d88aee68
DG
4088/*
4089 * Set the application version into the object.
4090 *
4091 * Return 0 on success else a negative value either an errno code or a
4092 * LTTng-UST error code.
4093 */
d0b96690
DG
4094int ust_app_version(struct ust_app *app)
4095{
d88aee68
DG
4096 int ret;
4097
a0377dfe 4098 LTTNG_ASSERT(app);
d88aee68 4099
fb45065e 4100 pthread_mutex_lock(&app->sock_lock);
b623cb6a 4101 ret = lttng_ust_ctl_tracer_version(app->sock, &app->version);
fb45065e 4102 pthread_mutex_unlock(&app->sock_lock);
d88aee68 4103 if (ret < 0) {
be355079
JR
4104 if (ret == -LTTNG_UST_ERR_EXITING || ret == -EPIPE) {
4105 DBG3("UST app version failed. Application is dead: pid = %d, sock = %d",
4106 app->pid, app->sock);
4107 } else if (ret == -EAGAIN) {
4108 WARN("UST app version failed. Communication time out: pid = %d, sock = %d",
4109 app->pid, app->sock);
d88aee68 4110 } else {
be355079
JR
4111 ERR("UST app version failed with ret %d: pid = %d, sock = %d",
4112 ret, app->pid, app->sock);
d88aee68
DG
4113 }
4114 }
4115
4116 return ret;
5b4a0ec0
DG
4117}
4118
783db316
MD
4119bool ust_app_supports_notifiers(const struct ust_app *app)
4120{
4121 return app->v_major >= 9;
4122}
4123
4124bool ust_app_supports_counters(const struct ust_app *app)
4125{
4126 return app->v_major >= 9;
4127}
4128
da873412
JR
4129/*
4130 * Setup the base event notifier group.
4131 *
4132 * Return 0 on success else a negative value either an errno code or a
4133 * LTTng-UST error code.
4134 */
4135int ust_app_setup_event_notifier_group(struct ust_app *app)
4136{
4137 int ret;
4138 int event_pipe_write_fd;
fc4b93fa 4139 struct lttng_ust_abi_object_data *event_notifier_group = NULL;
da873412 4140 enum lttng_error_code lttng_ret;
533a90fb 4141 enum event_notifier_error_accounting_status event_notifier_error_accounting_status;
da873412 4142
a0377dfe 4143 LTTNG_ASSERT(app);
da873412 4144
783db316
MD
4145 if (!ust_app_supports_notifiers(app)) {
4146 ret = -ENOSYS;
4147 goto error;
4148 }
4149
da873412
JR
4150 /* Get the write side of the pipe. */
4151 event_pipe_write_fd = lttng_pipe_get_writefd(
4152 app->event_notifier_group.event_pipe);
4153
4154 pthread_mutex_lock(&app->sock_lock);
b623cb6a 4155 ret = lttng_ust_ctl_create_event_notifier_group(app->sock,
da873412
JR
4156 event_pipe_write_fd, &event_notifier_group);
4157 pthread_mutex_unlock(&app->sock_lock);
4158 if (ret < 0) {
be355079
JR
4159 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
4160 ret = 0;
4161 DBG3("UST app create event notifier group failed. Application is dead: pid = %d, sock = %d",
4162 app->pid, app->sock);
4163 } else if (ret == -EAGAIN) {
4164 ret = 0;
4165 WARN("UST app create event notifier group failed. Communication time out: pid = %d, sock = %d",
4166 app->pid, app->sock);
da873412 4167 } else {
be355079
JR
4168 ERR("UST app create event notifier group failed with ret %d: pid = %d, sock = %d, event_pipe_write_fd: %d",
4169 ret, app->pid, app->sock, event_pipe_write_fd);
da873412 4170 }
da873412
JR
4171 goto error;
4172 }
4173
5d4193fd
JG
4174 ret = lttng_pipe_write_close(app->event_notifier_group.event_pipe);
4175 if (ret) {
be355079
JR
4176 ERR("Failed to close write end of the application's event source pipe: app = '%s' (pid = %d)",
4177 app->name, app->pid);
5d4193fd
JG
4178 goto error;
4179 }
4180
5e2abfaf
JG
4181 /*
4182 * Release the file descriptor that was reserved for the write-end of
4183 * the pipe.
4184 */
4185 lttng_fd_put(LTTNG_FD_APPS, 1);
4186
da873412 4187 lttng_ret = notification_thread_command_add_tracer_event_source(
412d7227
SM
4188 the_notification_thread_handle,
4189 lttng_pipe_get_readfd(
4190 app->event_notifier_group.event_pipe),
da873412
JR
4191 LTTNG_DOMAIN_UST);
4192 if (lttng_ret != LTTNG_OK) {
4193 ERR("Failed to add tracer event source to notification thread");
4194 ret = - 1;
4195 goto error;
4196 }
4197
4198 /* Assign handle only when the complete setup is valid. */
4199 app->event_notifier_group.object = event_notifier_group;
533a90fb 4200
a5a21280
FD
4201 event_notifier_error_accounting_status =
4202 event_notifier_error_accounting_register_app(app);
783db316
MD
4203 switch (event_notifier_error_accounting_status) {
4204 case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK:
4205 break;
4206 case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_UNSUPPORTED:
be355079
JR
4207 DBG3("Failed to setup event notifier error accounting (application does not support notifier error accounting): app socket fd = %d, app name = '%s', app pid = %d",
4208 app->sock, app->name, (int) app->pid);
783db316
MD
4209 ret = 0;
4210 goto error_accounting;
4211 case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD:
be355079
JR
4212 DBG3("Failed to setup event notifier error accounting (application is dead): app socket fd = %d, app name = '%s', app pid = %d",
4213 app->sock, app->name, (int) app->pid);
783db316
MD
4214 ret = 0;
4215 goto error_accounting;
4216 default:
533a90fb
FD
4217 ERR("Failed to setup event notifier error accounting for app");
4218 ret = -1;
cd9c532c 4219 goto error_accounting;
533a90fb
FD
4220 }
4221
da873412
JR
4222 return ret;
4223
cd9c532c
FD
4224error_accounting:
4225 lttng_ret = notification_thread_command_remove_tracer_event_source(
4226 the_notification_thread_handle,
4227 lttng_pipe_get_readfd(
4228 app->event_notifier_group.event_pipe));
4229 if (lttng_ret != LTTNG_OK) {
4230 ERR("Failed to remove application tracer event source from notification thread");
4231 }
4232
da873412 4233error:
b623cb6a 4234 lttng_ust_ctl_release_object(app->sock, app->event_notifier_group.object);
da873412 4235 free(app->event_notifier_group.object);
88631abd 4236 app->event_notifier_group.object = NULL;
da873412
JR
4237 return ret;
4238}
4239
5b4a0ec0
DG
4240/*
4241 * Unregister app by removing it from the global traceable app list and freeing
4242 * the data struct.
4243 *
4244 * The socket is already closed at this point so no close to sock.
4245 */
4246void ust_app_unregister(int sock)
4247{
4248 struct ust_app *lta;
bec39940 4249 struct lttng_ht_node_ulong *node;
c4b88406 4250 struct lttng_ht_iter ust_app_sock_iter;
bec39940 4251 struct lttng_ht_iter iter;
d42f20df 4252 struct ust_app_session *ua_sess;
525b0740 4253 int ret;
5b4a0ec0
DG
4254
4255 rcu_read_lock();
886459c6 4256
5b4a0ec0 4257 /* Get the node reference for a call_rcu */
c4b88406
MD
4258 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter);
4259 node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter);
a0377dfe 4260 LTTNG_ASSERT(node);
284d8f55 4261
852d0037 4262 lta = caa_container_of(node, struct ust_app, sock_n);
852d0037
DG
4263 DBG("PID %d unregistering with sock %d", lta->pid, sock);
4264
d88aee68 4265 /*
ce34fcd0
MD
4266 * For per-PID buffers, perform "push metadata" and flush all
4267 * application streams before removing app from hash tables,
4268 * ensuring proper behavior of data_pending check.
c4b88406 4269 * Remove sessions so they are not visible during deletion.
d88aee68 4270 */
d42f20df
DG
4271 cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess,
4272 node.node) {
7972aab2
DG
4273 struct ust_registry_session *registry;
4274
d42f20df
DG
4275 ret = lttng_ht_del(lta->sessions, &iter);
4276 if (ret) {
4277 /* The session was already removed so scheduled for teardown. */
4278 continue;
4279 }
4280
ce34fcd0
MD
4281 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) {
4282 (void) ust_app_flush_app_session(lta, ua_sess);
4283 }
c4b88406 4284
d42f20df
DG
4285 /*
4286 * Add session to list for teardown. This is safe since at this point we
4287 * are the only one using this list.
4288 */
d88aee68
DG
4289 pthread_mutex_lock(&ua_sess->lock);
4290
b161602a
MD
4291 if (ua_sess->deleted) {
4292 pthread_mutex_unlock(&ua_sess->lock);
4293 continue;
4294 }
4295
d88aee68
DG
4296 /*
4297 * Normally, this is done in the delete session process which is
4298 * executed in the call rcu below. However, upon registration we can't
4299 * afford to wait for the grace period before pushing data or else the
4300 * data pending feature can race between the unregistration and stop
4301 * command where the data pending command is sent *before* the grace
4302 * period ended.
4303 *
4304 * The close metadata below nullifies the metadata pointer in the
4305 * session so the delete session will NOT push/close a second time.
4306 */
7972aab2 4307 registry = get_session_registry(ua_sess);
ce34fcd0 4308 if (registry) {
7972aab2
DG
4309 /* Push metadata for application before freeing the application. */
4310 (void) push_metadata(registry, ua_sess->consumer);
4311
4312 /*
4313 * Don't ask to close metadata for global per UID buffers. Close
1b532a60
DG
4314 * metadata only on destroy trace session in this case. Also, the
4315 * previous push metadata could have flag the metadata registry to
4316 * close so don't send a close command if closed.
7972aab2 4317 */
ce34fcd0 4318 if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) {
7972aab2
DG
4319 /* And ask to close it for this session registry. */
4320 (void) close_metadata(registry, ua_sess->consumer);
4321 }
4322 }
d42f20df 4323 cds_list_add(&ua_sess->teardown_node, &lta->teardown_head);
c4b88406 4324
d88aee68 4325 pthread_mutex_unlock(&ua_sess->lock);
d42f20df
DG
4326 }
4327
c4b88406
MD
4328 /* Remove application from PID hash table */
4329 ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter);
a0377dfe 4330 LTTNG_ASSERT(!ret);
c4b88406
MD
4331
4332 /*
4333 * Remove application from notify hash table. The thread handling the
4334 * notify socket could have deleted the node so ignore on error because
c48239ca
JG
4335 * either way it's valid. The close of that socket is handled by the
4336 * apps_notify_thread.
c4b88406
MD
4337 */
4338 iter.iter.node = &lta->notify_sock_n.node;
4339 (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
4340
4341 /*
4342 * Ignore return value since the node might have been removed before by an
4343 * add replace during app registration because the PID can be reassigned by
4344 * the OS.
4345 */
4346 iter.iter.node = &lta->pid_n.node;
4347 ret = lttng_ht_del(ust_app_ht, &iter);
4348 if (ret) {
4349 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
4350 lta->pid);
4351 }
4352
852d0037
DG
4353 /* Free memory */
4354 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
4355
5b4a0ec0
DG
4356 rcu_read_unlock();
4357 return;
284d8f55
DG
4358}
4359
5b4a0ec0
DG
4360/*
4361 * Fill events array with all events name of all registered apps.
4362 */
4363int ust_app_list_events(struct lttng_event **events)
421cb601 4364{
5b4a0ec0
DG
4365 int ret, handle;
4366 size_t nbmem, count = 0;
bec39940 4367 struct lttng_ht_iter iter;
5b4a0ec0 4368 struct ust_app *app;
c617c0c6 4369 struct lttng_event *tmp_event;
421cb601 4370
5b4a0ec0 4371 nbmem = UST_APP_EVENT_LIST_SIZE;
64803277 4372 tmp_event = calloc<lttng_event>(nbmem);
c617c0c6 4373 if (tmp_event == NULL) {
5b4a0ec0
DG
4374 PERROR("zmalloc ust app events");
4375 ret = -ENOMEM;
421cb601
DG
4376 goto error;
4377 }
4378
5b4a0ec0 4379 rcu_read_lock();
421cb601 4380
852d0037 4381 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
fc4b93fa 4382 struct lttng_ust_abi_tracepoint_iter uiter;
ac3bd9c0 4383
840cb59c 4384 health_code_update();
86acf0da 4385
e0c7ec2b
DG
4386 if (!app->compatible) {
4387 /*
4388 * TODO: In time, we should notice the caller of this error by
4389 * telling him that this is a version error.
4390 */
4391 continue;
4392 }
fb45065e 4393 pthread_mutex_lock(&app->sock_lock);
b623cb6a 4394 handle = lttng_ust_ctl_tracepoint_list(app->sock);
5b4a0ec0 4395 if (handle < 0) {
ffe60014
DG
4396 if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) {
4397 ERR("UST app list events getting handle failed for app pid %d",
4398 app->pid);
4399 }
fb45065e 4400 pthread_mutex_unlock(&app->sock_lock);
5b4a0ec0
DG
4401 continue;
4402 }
421cb601 4403
b623cb6a 4404 while ((ret = lttng_ust_ctl_tracepoint_list_get(app->sock, handle,
fb54cdbf 4405 &uiter)) != -LTTNG_UST_ERR_NOENT) {
ffe60014
DG
4406 /* Handle ustctl error. */
4407 if (ret < 0) {
fb45065e
MD
4408 int release_ret;
4409
a2ba1ab0 4410 if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
ffe60014
DG
4411 ERR("UST app tp list get failed for app %d with ret %d",
4412 app->sock, ret);
4413 } else {
4414 DBG3("UST app tp list get failed. Application is dead");
3757b385 4415 break;
ffe60014 4416 }
98f595d4 4417 free(tmp_event);
b623cb6a 4418 release_ret = lttng_ust_ctl_release_handle(app->sock, handle);
68313703
JG
4419 if (release_ret < 0 &&
4420 release_ret != -LTTNG_UST_ERR_EXITING &&
4421 release_ret != -EPIPE) {
fb45065e
MD
4422 ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret);
4423 }
4424 pthread_mutex_unlock(&app->sock_lock);
ffe60014
DG
4425 goto rcu_error;
4426 }
4427
840cb59c 4428 health_code_update();
815564d8 4429 if (count >= nbmem) {
d7b3776f 4430 /* In case the realloc fails, we free the memory */
53efb85a
MD
4431 struct lttng_event *new_tmp_event;
4432 size_t new_nbmem;
4433
4434 new_nbmem = nbmem << 1;
4435 DBG2("Reallocating event list from %zu to %zu entries",
4436 nbmem, new_nbmem);
7966af57 4437 new_tmp_event = (lttng_event *) realloc(tmp_event,
53efb85a
MD
4438 new_nbmem * sizeof(struct lttng_event));
4439 if (new_tmp_event == NULL) {
fb45065e
MD
4440 int release_ret;
4441
5b4a0ec0 4442 PERROR("realloc ust app events");
c617c0c6 4443 free(tmp_event);
5b4a0ec0 4444 ret = -ENOMEM;
b623cb6a 4445 release_ret = lttng_ust_ctl_release_handle(app->sock, handle);
68313703
JG
4446 if (release_ret < 0 &&
4447 release_ret != -LTTNG_UST_ERR_EXITING &&
4448 release_ret != -EPIPE) {
fb45065e
MD
4449 ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret);
4450 }
4451 pthread_mutex_unlock(&app->sock_lock);
5b4a0ec0
DG
4452 goto rcu_error;
4453 }
53efb85a
MD
4454 /* Zero the new memory */
4455 memset(new_tmp_event + nbmem, 0,
4456 (new_nbmem - nbmem) * sizeof(struct lttng_event));
4457 nbmem = new_nbmem;
4458 tmp_event = new_tmp_event;
5b4a0ec0 4459 }
fc4b93fa 4460 memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_ABI_SYM_NAME_LEN);
c617c0c6 4461 tmp_event[count].loglevel = uiter.loglevel;
fc4b93fa 4462 tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_ABI_TRACEPOINT;
c617c0c6
MD
4463 tmp_event[count].pid = app->pid;
4464 tmp_event[count].enabled = -1;
5b4a0ec0 4465 count++;
421cb601 4466 }
b623cb6a 4467 ret = lttng_ust_ctl_release_handle(app->sock, handle);
fb45065e 4468 pthread_mutex_unlock(&app->sock_lock);
be355079
JR
4469 if (ret < 0) {
4470 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
4471 DBG3("Error releasing app handle. Application died: pid = %d, sock = %d",
4472 app->pid, app->sock);
4473 } else if (ret == -EAGAIN) {
4474 WARN("Error releasing app handle. Communication time out: pid = %d, sock = %d",
4475 app->pid, app->sock);
4476 } else {
4477 ERR("Error releasing app handle with ret %d: pid = %d, sock = %d",
4478 ret, app->pid, app->sock);
4479 }
fb45065e 4480 }
421cb601
DG
4481 }
4482
5b4a0ec0 4483 ret = count;
c617c0c6 4484 *events = tmp_event;
421cb601 4485
5b4a0ec0 4486 DBG2("UST app list events done (%zu events)", count);
421cb601 4487
5b4a0ec0
DG
4488rcu_error:
4489 rcu_read_unlock();
421cb601 4490error:
840cb59c 4491 health_code_update();
5b4a0ec0 4492 return ret;
421cb601
DG
4493}
4494
f37d259d
MD
4495/*
4496 * Fill events array with all events name of all registered apps.
4497 */
4498int ust_app_list_event_fields(struct lttng_event_field **fields)
4499{
4500 int ret, handle;
4501 size_t nbmem, count = 0;
4502 struct lttng_ht_iter iter;
4503 struct ust_app *app;
c617c0c6 4504 struct lttng_event_field *tmp_event;
f37d259d
MD
4505
4506 nbmem = UST_APP_EVENT_LIST_SIZE;
64803277 4507 tmp_event = calloc<lttng_event_field>(nbmem);
c617c0c6 4508 if (tmp_event == NULL) {
f37d259d
MD
4509 PERROR("zmalloc ust app event fields");
4510 ret = -ENOMEM;
4511 goto error;
4512 }
4513
4514 rcu_read_lock();
4515
4516 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
fc4b93fa 4517 struct lttng_ust_abi_field_iter uiter;
f37d259d 4518
840cb59c 4519 health_code_update();
86acf0da 4520
f37d259d
MD
4521 if (!app->compatible) {
4522 /*
4523 * TODO: In time, we should notice the caller of this error by
4524 * telling him that this is a version error.
4525 */
4526 continue;
4527 }
fb45065e 4528 pthread_mutex_lock(&app->sock_lock);
b623cb6a 4529 handle = lttng_ust_ctl_tracepoint_field_list(app->sock);
f37d259d 4530 if (handle < 0) {
ffe60014
DG
4531 if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) {
4532 ERR("UST app list field getting handle failed for app pid %d",
4533 app->pid);
4534 }
fb45065e 4535 pthread_mutex_unlock(&app->sock_lock);
f37d259d
MD
4536 continue;
4537 }
4538
b623cb6a 4539 while ((ret = lttng_ust_ctl_tracepoint_field_list_get(app->sock, handle,
fb54cdbf 4540 &uiter)) != -LTTNG_UST_ERR_NOENT) {
ffe60014
DG
4541 /* Handle ustctl error. */
4542 if (ret < 0) {
fb45065e
MD
4543 int release_ret;
4544
a2ba1ab0 4545 if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
ffe60014
DG
4546 ERR("UST app tp list field failed for app %d with ret %d",
4547 app->sock, ret);
4548 } else {
4549 DBG3("UST app tp list field failed. Application is dead");
3757b385 4550 break;
ffe60014 4551 }
98f595d4 4552 free(tmp_event);
b623cb6a 4553 release_ret = lttng_ust_ctl_release_handle(app->sock, handle);
fb45065e 4554 pthread_mutex_unlock(&app->sock_lock);
68313703
JG
4555 if (release_ret < 0 &&
4556 release_ret != -LTTNG_UST_ERR_EXITING &&
4557 release_ret != -EPIPE) {
fb45065e
MD
4558 ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret);
4559 }
ffe60014
DG
4560 goto rcu_error;
4561 }
4562
840cb59c 4563 health_code_update();
f37d259d 4564 if (count >= nbmem) {
d7b3776f 4565 /* In case the realloc fails, we free the memory */
53efb85a
MD
4566 struct lttng_event_field *new_tmp_event;
4567 size_t new_nbmem;
4568
4569 new_nbmem = nbmem << 1;
4570 DBG2("Reallocating event field list from %zu to %zu entries",
4571 nbmem, new_nbmem);
7966af57 4572 new_tmp_event = (lttng_event_field *) realloc(tmp_event,
53efb85a
MD
4573 new_nbmem * sizeof(struct lttng_event_field));
4574 if (new_tmp_event == NULL) {
fb45065e
MD
4575 int release_ret;
4576
f37d259d 4577 PERROR("realloc ust app event fields");
c617c0c6 4578 free(tmp_event);
f37d259d 4579 ret = -ENOMEM;
b623cb6a 4580 release_ret = lttng_ust_ctl_release_handle(app->sock, handle);
fb45065e 4581 pthread_mutex_unlock(&app->sock_lock);
68313703
JG
4582 if (release_ret &&
4583 release_ret != -LTTNG_UST_ERR_EXITING &&
4584 release_ret != -EPIPE) {
fb45065e
MD
4585 ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret);
4586 }
f37d259d
MD
4587 goto rcu_error;
4588 }
53efb85a
MD
4589 /* Zero the new memory */
4590 memset(new_tmp_event + nbmem, 0,
4591 (new_nbmem - nbmem) * sizeof(struct lttng_event_field));
4592 nbmem = new_nbmem;
4593 tmp_event = new_tmp_event;
f37d259d 4594 }
f37d259d 4595
fc4b93fa 4596 memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_ABI_SYM_NAME_LEN);
2e84128e
DG
4597 /* Mapping between these enums matches 1 to 1. */
4598 tmp_event[count].type = (enum lttng_event_field_type) uiter.type;
c617c0c6 4599 tmp_event[count].nowrite = uiter.nowrite;
f37d259d 4600
fc4b93fa 4601 memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_ABI_SYM_NAME_LEN);
c617c0c6 4602 tmp_event[count].event.loglevel = uiter.loglevel;
2e84128e 4603 tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT;
c617c0c6
MD
4604 tmp_event[count].event.pid = app->pid;
4605 tmp_event[count].event.enabled = -1;
f37d259d
MD
4606 count++;
4607 }
b623cb6a 4608 ret = lttng_ust_ctl_release_handle(app->sock, handle);
fb45065e 4609 pthread_mutex_unlock(&app->sock_lock);
68313703
JG
4610 if (ret < 0 &&
4611 ret != -LTTNG_UST_ERR_EXITING &&
4612 ret != -EPIPE) {
fb45065e
MD
4613 ERR("Error releasing app handle for app %d with ret %d", app->sock, ret);
4614 }
f37d259d
MD
4615 }
4616
4617 ret = count;
c617c0c6 4618 *fields = tmp_event;
f37d259d
MD
4619
4620 DBG2("UST app list event fields done (%zu events)", count);
4621
4622rcu_error:
4623 rcu_read_unlock();
4624error:
840cb59c 4625 health_code_update();
f37d259d
MD
4626 return ret;
4627}
4628
5b4a0ec0
DG
4629/*
4630 * Free and clean all traceable apps of the global list.
4631 */
4632void ust_app_clean_list(void)
421cb601 4633{
5b4a0ec0 4634 int ret;
659ed79f 4635 struct ust_app *app;
bec39940 4636 struct lttng_ht_iter iter;
421cb601 4637
5b4a0ec0 4638 DBG2("UST app cleaning registered apps hash table");
421cb601 4639
5b4a0ec0 4640 rcu_read_lock();
421cb601 4641
faadaa3a
JG
4642 /* Cleanup notify socket hash table */
4643 if (ust_app_ht_by_notify_sock) {
4644 cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app,
4645 notify_sock_n.node) {
b69a1b40
JG
4646 /*
4647 * Assert that all notifiers are gone as all triggers
4648 * are unregistered prior to this clean-up.
4649 */
a0377dfe 4650 LTTNG_ASSERT(lttng_ht_get_count(app->token_to_event_notifier_rule_ht) == 0);
faadaa3a 4651
faadaa3a
JG
4652 ust_app_notify_sock_unregister(app->notify_sock);
4653 }
4654 }
4655
f1b711c4
MD
4656 if (ust_app_ht) {
4657 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4658 ret = lttng_ht_del(ust_app_ht, &iter);
a0377dfe 4659 LTTNG_ASSERT(!ret);
f1b711c4
MD
4660 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
4661 }
421cb601
DG
4662 }
4663
852d0037 4664 /* Cleanup socket hash table */
f1b711c4
MD
4665 if (ust_app_ht_by_sock) {
4666 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app,
4667 sock_n.node) {
4668 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
a0377dfe 4669 LTTNG_ASSERT(!ret);
f1b711c4 4670 }
bec39940 4671 }
852d0037 4672
36b588ed 4673 rcu_read_unlock();
d88aee68 4674
bec39940 4675 /* Destroy is done only when the ht is empty */
f1b711c4 4676 if (ust_app_ht) {
3c339053 4677 lttng_ht_destroy(ust_app_ht);
f1b711c4
MD
4678 }
4679 if (ust_app_ht_by_sock) {
3c339053 4680 lttng_ht_destroy(ust_app_ht_by_sock);
f1b711c4
MD
4681 }
4682 if (ust_app_ht_by_notify_sock) {
3c339053 4683 lttng_ht_destroy(ust_app_ht_by_notify_sock);
f1b711c4 4684 }
5b4a0ec0
DG
4685}
4686
4687/*
4688 * Init UST app hash table.
4689 */
57703f6e 4690int ust_app_ht_alloc(void)
5b4a0ec0 4691{
bec39940 4692 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
57703f6e
MD
4693 if (!ust_app_ht) {
4694 return -1;
4695 }
852d0037 4696 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
57703f6e
MD
4697 if (!ust_app_ht_by_sock) {
4698 return -1;
4699 }
d0b96690 4700 ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
57703f6e
MD
4701 if (!ust_app_ht_by_notify_sock) {
4702 return -1;
4703 }
4704 return 0;
421cb601
DG
4705}
4706
78f0bacd
DG
4707/*
4708 * For a specific UST session, disable the channel for all registered apps.
4709 */
35a9059d 4710int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
4711 struct ltt_ust_channel *uchan)
4712{
4713 int ret = 0;
bec39940
DG
4714 struct lttng_ht_iter iter;
4715 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
4716 struct ust_app *app;
4717 struct ust_app_session *ua_sess;
8535a6d9 4718 struct ust_app_channel *ua_chan;
78f0bacd 4719
a0377dfe 4720 LTTNG_ASSERT(usess->active);
d9bf3ca4 4721 DBG2("UST app disabling channel %s from global domain for session id %" PRIu64,
a991f516 4722 uchan->name, usess->id);
78f0bacd
DG
4723
4724 rcu_read_lock();
4725
4726 /* For every registered applications */
852d0037 4727 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 4728 struct lttng_ht_iter uiter;
e0c7ec2b
DG
4729 if (!app->compatible) {
4730 /*
4731 * TODO: In time, we should notice the caller of this error by
4732 * telling him that this is a version error.
4733 */
4734 continue;
4735 }
78f0bacd
DG
4736 ua_sess = lookup_session_by_app(usess, app);
4737 if (ua_sess == NULL) {
4738 continue;
4739 }
4740
8535a6d9 4741 /* Get channel */
bec39940
DG
4742 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
4743 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9 4744 /* If the session if found for the app, the channel must be there */
a0377dfe 4745 LTTNG_ASSERT(ua_chan_node);
8535a6d9
DG
4746
4747 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
4748 /* The channel must not be already disabled */
a0377dfe 4749 LTTNG_ASSERT(ua_chan->enabled == 1);
8535a6d9
DG
4750
4751 /* Disable channel onto application */
4752 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
4753 if (ret < 0) {
4754 /* XXX: We might want to report this error at some point... */
4755 continue;
4756 }
4757 }
4758
4759 rcu_read_unlock();
78f0bacd
DG
4760 return ret;
4761}
4762
4763/*
4764 * For a specific UST session, enable the channel for all registered apps.
4765 */
35a9059d 4766int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
4767 struct ltt_ust_channel *uchan)
4768{
4769 int ret = 0;
bec39940 4770 struct lttng_ht_iter iter;
78f0bacd
DG
4771 struct ust_app *app;
4772 struct ust_app_session *ua_sess;
4773
a0377dfe 4774 LTTNG_ASSERT(usess->active);
d9bf3ca4 4775 DBG2("UST app enabling channel %s to global domain for session id %" PRIu64,
a991f516 4776 uchan->name, usess->id);
78f0bacd
DG
4777
4778 rcu_read_lock();
4779
4780 /* For every registered applications */
852d0037 4781 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
4782 if (!app->compatible) {
4783 /*
4784 * TODO: In time, we should notice the caller of this error by
4785 * telling him that this is a version error.
4786 */
4787 continue;
4788 }
78f0bacd
DG
4789 ua_sess = lookup_session_by_app(usess, app);
4790 if (ua_sess == NULL) {
4791 continue;
4792 }
4793
4794 /* Enable channel onto application */
4795 ret = enable_ust_app_channel(ua_sess, uchan, app);
4796 if (ret < 0) {
4797 /* XXX: We might want to report this error at some point... */
4798 continue;
4799 }
4800 }
4801
4802 rcu_read_unlock();
78f0bacd
DG
4803 return ret;
4804}
4805
b0a40d28
DG
4806/*
4807 * Disable an event in a channel and for a specific session.
4808 */
35a9059d
DG
4809int ust_app_disable_event_glb(struct ltt_ust_session *usess,
4810 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
b0a40d28
DG
4811{
4812 int ret = 0;
bec39940 4813 struct lttng_ht_iter iter, uiter;
700c5a9d 4814 struct lttng_ht_node_str *ua_chan_node;
b0a40d28
DG
4815 struct ust_app *app;
4816 struct ust_app_session *ua_sess;
4817 struct ust_app_channel *ua_chan;
4818 struct ust_app_event *ua_event;
4819
a0377dfe 4820 LTTNG_ASSERT(usess->active);
b0a40d28 4821 DBG("UST app disabling event %s for all apps in channel "
d9bf3ca4
MD
4822 "%s for session id %" PRIu64,
4823 uevent->attr.name, uchan->name, usess->id);
b0a40d28
DG
4824
4825 rcu_read_lock();
4826
4827 /* For all registered applications */
852d0037 4828 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
4829 if (!app->compatible) {
4830 /*
4831 * TODO: In time, we should notice the caller of this error by
4832 * telling him that this is a version error.
4833 */
4834 continue;
4835 }
b0a40d28
DG
4836 ua_sess = lookup_session_by_app(usess, app);
4837 if (ua_sess == NULL) {
4838 /* Next app */
4839 continue;
4840 }
4841
4842 /* Lookup channel in the ust app session */
bec39940
DG
4843 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
4844 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28 4845 if (ua_chan_node == NULL) {
d9bf3ca4 4846 DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d."
852d0037 4847 "Skipping", uchan->name, usess->id, app->pid);
b0a40d28
DG
4848 continue;
4849 }
4850 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
4851
700c5a9d
JR
4852 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
4853 uevent->filter, uevent->attr.loglevel,
4854 uevent->exclusion);
4855 if (ua_event == NULL) {
b0a40d28 4856 DBG2("Event %s not found in channel %s for app pid %d."
852d0037 4857 "Skipping", uevent->attr.name, uchan->name, app->pid);
b0a40d28
DG
4858 continue;
4859 }
b0a40d28 4860
f46376a1 4861 ret = disable_ust_app_event(ua_event, app);
b0a40d28
DG
4862 if (ret < 0) {
4863 /* XXX: Report error someday... */
4864 continue;
4865 }
4866 }
4867
4868 rcu_read_unlock();
88e3c2f5
JG
4869 return ret;
4870}
4871
4872/* The ua_sess lock must be held by the caller. */
4873static
4874int ust_app_channel_create(struct ltt_ust_session *usess,
4875 struct ust_app_session *ua_sess,
4876 struct ltt_ust_channel *uchan, struct ust_app *app,
4877 struct ust_app_channel **_ua_chan)
4878{
4879 int ret = 0;
4880 struct ust_app_channel *ua_chan = NULL;
4881
a0377dfe 4882 LTTNG_ASSERT(ua_sess);
88e3c2f5
JG
4883 ASSERT_LOCKED(ua_sess->lock);
4884
4885 if (!strncmp(uchan->name, DEFAULT_METADATA_NAME,
4886 sizeof(uchan->name))) {
4887 copy_channel_attr_to_ustctl(&ua_sess->metadata_attr,
4888 &uchan->attr);
4889 ret = 0;
4890 } else {
4891 struct ltt_ust_context *uctx = NULL;
4892
4893 /*
4894 * Create channel onto application and synchronize its
4895 * configuration.
4896 */
4897 ret = ust_app_channel_allocate(ua_sess, uchan,
fc4b93fa 4898 LTTNG_UST_ABI_CHAN_PER_CPU, usess,
88e3c2f5 4899 &ua_chan);
88ebf5a7
JR
4900 if (ret < 0) {
4901 goto error;
4902 }
4903
4904 ret = ust_app_channel_send(app, usess,
4905 ua_sess, ua_chan);
4906 if (ret) {
4907 goto error;
88e3c2f5
JG
4908 }
4909
4910 /* Add contexts. */
4911 cds_list_for_each_entry(uctx, &uchan->ctx_list, list) {
4912 ret = create_ust_app_channel_context(ua_chan,
4913 &uctx->ctx, app);
4914 if (ret) {
88ebf5a7 4915 goto error;
88e3c2f5
JG
4916 }
4917 }
4918 }
88ebf5a7
JR
4919
4920error:
88e3c2f5
JG
4921 if (ret < 0) {
4922 switch (ret) {
4923 case -ENOTCONN:
4924 /*
4925 * The application's socket is not valid. Either a bad socket
4926 * or a timeout on it. We can't inform the caller that for a
4927 * specific app, the session failed so lets continue here.
4928 */
4929 ret = 0; /* Not an error. */
4930 break;
4931 case -ENOMEM:
4932 default:
4933 break;
4934 }
4935 }
88ebf5a7 4936
88e3c2f5
JG
4937 if (ret == 0 && _ua_chan) {
4938 /*
4939 * Only return the application's channel on success. Note
4940 * that the channel can still be part of the application's
4941 * channel hashtable on error.
4942 */
4943 *_ua_chan = ua_chan;
4944 }
b0a40d28
DG
4945 return ret;
4946}
4947
5b4a0ec0 4948/*
edb67388 4949 * Enable event for a specific session and channel on the tracer.
5b4a0ec0 4950 */
35a9059d 4951int ust_app_enable_event_glb(struct ltt_ust_session *usess,
48842b30
DG
4952 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
4953{
4954 int ret = 0;
bec39940 4955 struct lttng_ht_iter iter, uiter;
18eace3b 4956 struct lttng_ht_node_str *ua_chan_node;
48842b30
DG
4957 struct ust_app *app;
4958 struct ust_app_session *ua_sess;
4959 struct ust_app_channel *ua_chan;
4960 struct ust_app_event *ua_event;
48842b30 4961
a0377dfe 4962 LTTNG_ASSERT(usess->active);
d9bf3ca4 4963 DBG("UST app enabling event %s for all apps for session id %" PRIu64,
a991f516 4964 uevent->attr.name, usess->id);
48842b30 4965
edb67388
DG
4966 /*
4967 * NOTE: At this point, this function is called only if the session and
4968 * channel passed are already created for all apps. and enabled on the
4969 * tracer also.
4970 */
4971
48842b30 4972 rcu_read_lock();
421cb601
DG
4973
4974 /* For all registered applications */
852d0037 4975 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
4976 if (!app->compatible) {
4977 /*
4978 * TODO: In time, we should notice the caller of this error by
4979 * telling him that this is a version error.
4980 */
4981 continue;
4982 }
edb67388 4983 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
4984 if (!ua_sess) {
4985 /* The application has problem or is probably dead. */
4986 continue;
4987 }
ba767faf 4988
d0b96690
DG
4989 pthread_mutex_lock(&ua_sess->lock);
4990
b161602a
MD
4991 if (ua_sess->deleted) {
4992 pthread_mutex_unlock(&ua_sess->lock);
4993 continue;
4994 }
4995
edb67388 4996 /* Lookup channel in the ust app session */
bec39940
DG
4997 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
4998 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
a7169585
MD
4999 /*
5000 * It is possible that the channel cannot be found is
5001 * the channel/event creation occurs concurrently with
5002 * an application exit.
5003 */
5004 if (!ua_chan_node) {
5005 pthread_mutex_unlock(&ua_sess->lock);
5006 continue;
5007 }
edb67388
DG
5008
5009 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
5010
18eace3b
DG
5011 /* Get event node */
5012 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
39c5a3a7 5013 uevent->filter, uevent->attr.loglevel, uevent->exclusion);
18eace3b 5014 if (ua_event == NULL) {
7f79d3a1 5015 DBG3("UST app enable event %s not found for app PID %d."
852d0037 5016 "Skipping app", uevent->attr.name, app->pid);
d0b96690 5017 goto next_app;
35a9059d 5018 }
35a9059d 5019
f46376a1 5020 ret = enable_ust_app_event(ua_event, app);
35a9059d 5021 if (ret < 0) {
d0b96690 5022 pthread_mutex_unlock(&ua_sess->lock);
7f79d3a1 5023 goto error;
48842b30 5024 }
d0b96690
DG
5025 next_app:
5026 pthread_mutex_unlock(&ua_sess->lock);
edb67388
DG
5027 }
5028
7f79d3a1 5029error:
edb67388 5030 rcu_read_unlock();
edb67388
DG
5031 return ret;
5032}
5033
5034/*
5035 * For a specific existing UST session and UST channel, creates the event for
5036 * all registered apps.
5037 */
35a9059d 5038int ust_app_create_event_glb(struct ltt_ust_session *usess,
edb67388
DG
5039 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
5040{
5041 int ret = 0;
bec39940
DG
5042 struct lttng_ht_iter iter, uiter;
5043 struct lttng_ht_node_str *ua_chan_node;
edb67388
DG
5044 struct ust_app *app;
5045 struct ust_app_session *ua_sess;
5046 struct ust_app_channel *ua_chan;
5047
a0377dfe 5048 LTTNG_ASSERT(usess->active);
d9bf3ca4 5049 DBG("UST app creating event %s for all apps for session id %" PRIu64,
a991f516 5050 uevent->attr.name, usess->id);
edb67388 5051
edb67388
DG
5052 rcu_read_lock();
5053
5054 /* For all registered applications */
852d0037 5055 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
5056 if (!app->compatible) {
5057 /*
5058 * TODO: In time, we should notice the caller of this error by
5059 * telling him that this is a version error.
5060 */
5061 continue;
5062 }
edb67388 5063 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
5064 if (!ua_sess) {
5065 /* The application has problem or is probably dead. */
5066 continue;
5067 }
48842b30 5068
d0b96690 5069 pthread_mutex_lock(&ua_sess->lock);
b161602a
MD
5070
5071 if (ua_sess->deleted) {
5072 pthread_mutex_unlock(&ua_sess->lock);
5073 continue;
5074 }
5075
48842b30 5076 /* Lookup channel in the ust app session */
bec39940
DG
5077 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
5078 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388 5079 /* If the channel is not found, there is a code flow error */
a0377dfe 5080 LTTNG_ASSERT(ua_chan_node);
edb67388 5081
48842b30
DG
5082 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
5083
f46376a1 5084 ret = create_ust_app_event(ua_chan, uevent, app);
d0b96690 5085 pthread_mutex_unlock(&ua_sess->lock);
edb67388 5086 if (ret < 0) {
49c336c1 5087 if (ret != -LTTNG_UST_ERR_EXIST) {
fc34caaa
DG
5088 /* Possible value at this point: -ENOMEM. If so, we stop! */
5089 break;
5090 }
5091 DBG2("UST app event %s already exist on app PID %d",
852d0037 5092 uevent->attr.name, app->pid);
5b4a0ec0 5093 continue;
48842b30 5094 }
48842b30 5095 }
5b4a0ec0 5096
48842b30 5097 rcu_read_unlock();
48842b30
DG
5098 return ret;
5099}
5100
5b4a0ec0
DG
5101/*
5102 * Start tracing for a specific UST session and app.
fad1ed2f
JR
5103 *
5104 * Called with UST app session lock held.
5105 *
5b4a0ec0 5106 */
b34cbebf 5107static
421cb601 5108int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
48842b30
DG
5109{
5110 int ret = 0;
48842b30 5111 struct ust_app_session *ua_sess;
48842b30 5112
852d0037 5113 DBG("Starting tracing for ust app pid %d", app->pid);
5cf5d0e7 5114
509cbaf8
MD
5115 rcu_read_lock();
5116
e0c7ec2b
DG
5117 if (!app->compatible) {
5118 goto end;
5119 }
5120
421cb601
DG
5121 ua_sess = lookup_session_by_app(usess, app);
5122 if (ua_sess == NULL) {
d42f20df
DG
5123 /* The session is in teardown process. Ignore and continue. */
5124 goto end;
421cb601 5125 }
48842b30 5126
d0b96690
DG
5127 pthread_mutex_lock(&ua_sess->lock);
5128
b161602a
MD
5129 if (ua_sess->deleted) {
5130 pthread_mutex_unlock(&ua_sess->lock);
5131 goto end;
5132 }
5133
b0a1c741
JR
5134 if (ua_sess->enabled) {
5135 pthread_mutex_unlock(&ua_sess->lock);
5136 goto end;
5137 }
5138
aea829b3
DG
5139 /* Upon restart, we skip the setup, already done */
5140 if (ua_sess->started) {
8be98f9a 5141 goto skip_setup;
aea829b3 5142 }
8be98f9a 5143
840cb59c 5144 health_code_update();
86acf0da 5145
8be98f9a 5146skip_setup:
a945cdc7 5147 /* This starts the UST tracing */
fb45065e 5148 pthread_mutex_lock(&app->sock_lock);
b623cb6a 5149 ret = lttng_ust_ctl_start_session(app->sock, ua_sess->handle);
fb45065e 5150 pthread_mutex_unlock(&app->sock_lock);
421cb601 5151 if (ret < 0) {
be355079
JR
5152 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
5153 DBG3("UST app start session failed. Application is dead: pid = %d, sock = %d",
5154 app->pid, app->sock);
5155 pthread_mutex_unlock(&ua_sess->lock);
5156 goto end;
5157 } else if (ret == -EAGAIN) {
5158 WARN("UST app start session failed. Communication time out: pid = %d, sock = %d",
5159 app->pid, app->sock);
3757b385
DG
5160 pthread_mutex_unlock(&ua_sess->lock);
5161 goto end;
be355079
JR
5162
5163 } else {
5164 ERR("UST app start session failed with ret %d: pid = %d, sock = %d",
5165 ret, app->pid, app->sock);
ffe60014 5166 }
d0b96690 5167 goto error_unlock;
421cb601 5168 }
5b4a0ec0 5169
55c3953d
DG
5170 /* Indicate that the session has been started once */
5171 ua_sess->started = 1;
b0a1c741 5172 ua_sess->enabled = 1;
55c3953d 5173
d0b96690
DG
5174 pthread_mutex_unlock(&ua_sess->lock);
5175
840cb59c 5176 health_code_update();
86acf0da 5177
421cb601 5178 /* Quiescent wait after starting trace */
fb45065e 5179 pthread_mutex_lock(&app->sock_lock);
b623cb6a 5180 ret = lttng_ust_ctl_wait_quiescent(app->sock);
fb45065e 5181 pthread_mutex_unlock(&app->sock_lock);
be355079
JR
5182 if (ret < 0) {
5183 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
5184 DBG3("UST app wait quiescent failed. Application is dead: pid = %d, sock = %d",
5185 app->pid, app->sock);
5186 } else if (ret == -EAGAIN) {
5187 WARN("UST app wait quiescent failed. Communication time out: pid = %d, sock = %d",
5188 app->pid, app->sock);
5189 } else {
5190 ERR("UST app wait quiescent failed with ret %d: pid %d, sock = %d",
5191 ret, app->pid, app->sock);
5192 }
ffe60014 5193 }
48842b30 5194
e0c7ec2b
DG
5195end:
5196 rcu_read_unlock();
840cb59c 5197 health_code_update();
421cb601 5198 return 0;
48842b30 5199
d0b96690
DG
5200error_unlock:
5201 pthread_mutex_unlock(&ua_sess->lock);
509cbaf8 5202 rcu_read_unlock();
840cb59c 5203 health_code_update();
421cb601
DG
5204 return -1;
5205}
48842b30 5206
8be98f9a
MD
5207/*
5208 * Stop tracing for a specific UST session and app.
5209 */
b34cbebf 5210static
8be98f9a
MD
5211int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
5212{
5213 int ret = 0;
5214 struct ust_app_session *ua_sess;
7972aab2 5215 struct ust_registry_session *registry;
8be98f9a 5216
852d0037 5217 DBG("Stopping tracing for ust app pid %d", app->pid);
8be98f9a
MD
5218
5219 rcu_read_lock();
5220
e0c7ec2b 5221 if (!app->compatible) {
d88aee68 5222 goto end_no_session;
e0c7ec2b
DG
5223 }
5224
8be98f9a
MD
5225 ua_sess = lookup_session_by_app(usess, app);
5226 if (ua_sess == NULL) {
d88aee68 5227 goto end_no_session;
8be98f9a
MD
5228 }
5229
d88aee68
DG
5230 pthread_mutex_lock(&ua_sess->lock);
5231
b161602a
MD
5232 if (ua_sess->deleted) {
5233 pthread_mutex_unlock(&ua_sess->lock);
5234 goto end_no_session;
5235 }
5236
9bc07046
DG
5237 /*
5238 * If started = 0, it means that stop trace has been called for a session
c45536e1
DG
5239 * that was never started. It's possible since we can have a fail start
5240 * from either the application manager thread or the command thread. Simply
5241 * indicate that this is a stop error.
9bc07046 5242 */
f9dfc3d9 5243 if (!ua_sess->started) {
c45536e1
DG
5244 goto error_rcu_unlock;
5245 }
7db205b5 5246
840cb59c 5247 health_code_update();
86acf0da 5248
9d6c7d3f 5249 /* This inhibits UST tracing */
fb45065e 5250 pthread_mutex_lock(&app->sock_lock);
b623cb6a 5251 ret = lttng_ust_ctl_stop_session(app->sock, ua_sess->handle);
fb45065e 5252 pthread_mutex_unlock(&app->sock_lock);
9d6c7d3f 5253 if (ret < 0) {
be355079
JR
5254 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
5255 DBG3("UST app stop session failed. Application is dead: pid = %d, sock = %d",
5256 app->pid, app->sock);
3757b385 5257 goto end_unlock;
be355079
JR
5258 } else if (ret == -EAGAIN) {
5259 WARN("UST app stop session failed. Communication time out: pid = %d, sock = %d",
5260 app->pid, app->sock);
5261 goto end_unlock;
5262
5263 } else {
5264 ERR("UST app stop session failed with ret %d: pid = %d, sock = %d",
5265 ret, app->pid, app->sock);
ffe60014 5266 }
9d6c7d3f
DG
5267 goto error_rcu_unlock;
5268 }
5269
840cb59c 5270 health_code_update();
b0a1c741 5271 ua_sess->enabled = 0;
86acf0da 5272
9d6c7d3f 5273 /* Quiescent wait after stopping trace */
fb45065e 5274 pthread_mutex_lock(&app->sock_lock);
b623cb6a 5275 ret = lttng_ust_ctl_wait_quiescent(app->sock);
fb45065e 5276 pthread_mutex_unlock(&app->sock_lock);
be355079
JR
5277 if (ret < 0) {
5278 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
9324443a 5279 DBG3("UST app wait quiescent failed. Application is dead: pid= %d, sock = %d",
be355079
JR
5280 app->pid, app->sock);
5281 } else if (ret == -EAGAIN) {
9324443a 5282 WARN("UST app wait quiescent failed. Communication time out: pid= %d, sock = %d",
be355079
JR
5283 app->pid, app->sock);
5284 } else {
9324443a 5285 ERR("UST app wait quiescent failed with ret %d: pid= %d, sock = %d",
be355079
JR
5286 ret, app->pid, app->sock);
5287 }
ffe60014 5288 }
9d6c7d3f 5289
840cb59c 5290 health_code_update();
86acf0da 5291
b34cbebf 5292 registry = get_session_registry(ua_sess);
fad1ed2f
JR
5293
5294 /* The UST app session is held registry shall not be null. */
a0377dfe 5295 LTTNG_ASSERT(registry);
1b532a60 5296
ce34fcd0
MD
5297 /* Push metadata for application before freeing the application. */
5298 (void) push_metadata(registry, ua_sess->consumer);
b34cbebf 5299
3757b385 5300end_unlock:
b34cbebf
MD
5301 pthread_mutex_unlock(&ua_sess->lock);
5302end_no_session:
5303 rcu_read_unlock();
5304 health_code_update();
5305 return 0;
5306
5307error_rcu_unlock:
5308 pthread_mutex_unlock(&ua_sess->lock);
5309 rcu_read_unlock();
5310 health_code_update();
5311 return -1;
5312}
5313
b34cbebf 5314static
c4b88406
MD
5315int ust_app_flush_app_session(struct ust_app *app,
5316 struct ust_app_session *ua_sess)
b34cbebf 5317{
c4b88406 5318 int ret, retval = 0;
b34cbebf 5319 struct lttng_ht_iter iter;
b34cbebf 5320 struct ust_app_channel *ua_chan;
c4b88406 5321 struct consumer_socket *socket;
b34cbebf 5322
c4b88406 5323 DBG("Flushing app session buffers for ust app pid %d", app->pid);
b34cbebf
MD
5324
5325 rcu_read_lock();
5326
5327 if (!app->compatible) {
c4b88406 5328 goto end_not_compatible;
b34cbebf
MD
5329 }
5330
5331 pthread_mutex_lock(&ua_sess->lock);
5332
b161602a
MD
5333 if (ua_sess->deleted) {
5334 goto end_deleted;
5335 }
5336
b34cbebf
MD
5337 health_code_update();
5338
9d6c7d3f 5339 /* Flushing buffers */
c4b88406
MD
5340 socket = consumer_find_socket_by_bitness(app->bits_per_long,
5341 ua_sess->consumer);
ce34fcd0
MD
5342
5343 /* Flush buffers and push metadata. */
5344 switch (ua_sess->buffer_type) {
5345 case LTTNG_BUFFER_PER_PID:
5346 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
5347 node.node) {
5348 health_code_update();
ce34fcd0
MD
5349 ret = consumer_flush_channel(socket, ua_chan->key);
5350 if (ret) {
5351 ERR("Error flushing consumer channel");
5352 retval = -1;
5353 continue;
5354 }
8be98f9a 5355 }
ce34fcd0
MD
5356 break;
5357 case LTTNG_BUFFER_PER_UID:
5358 default:
a0377dfe 5359 abort();
ce34fcd0 5360 break;
8be98f9a 5361 }
8be98f9a 5362
840cb59c 5363 health_code_update();
86acf0da 5364
b161602a 5365end_deleted:
d88aee68 5366 pthread_mutex_unlock(&ua_sess->lock);
ce34fcd0 5367
c4b88406
MD
5368end_not_compatible:
5369 rcu_read_unlock();
5370 health_code_update();
5371 return retval;
5372}
5373
5374/*
ce34fcd0
MD
5375 * Flush buffers for all applications for a specific UST session.
5376 * Called with UST session lock held.
c4b88406
MD
5377 */
5378static
ce34fcd0 5379int ust_app_flush_session(struct ltt_ust_session *usess)
c4b88406
MD
5380
5381{
99b1411c 5382 int ret = 0;
c4b88406 5383
ce34fcd0 5384 DBG("Flushing session buffers for all ust apps");
c4b88406
MD
5385
5386 rcu_read_lock();
5387
ce34fcd0
MD
5388 /* Flush buffers and push metadata. */
5389 switch (usess->buffer_type) {
5390 case LTTNG_BUFFER_PER_UID:
5391 {
5392 struct buffer_reg_uid *reg;
5393 struct lttng_ht_iter iter;
5394
5395 /* Flush all per UID buffers associated to that session. */
5396 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
5397 struct ust_registry_session *ust_session_reg;
3273699d 5398 struct buffer_reg_channel *buf_reg_chan;
ce34fcd0
MD
5399 struct consumer_socket *socket;
5400
5401 /* Get consumer socket to use to push the metadata.*/
5402 socket = consumer_find_socket_by_bitness(reg->bits_per_long,
5403 usess->consumer);
5404 if (!socket) {
5405 /* Ignore request if no consumer is found for the session. */
5406 continue;
5407 }
5408
5409 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
3273699d 5410 buf_reg_chan, node.node) {
ce34fcd0
MD
5411 /*
5412 * The following call will print error values so the return
5413 * code is of little importance because whatever happens, we
5414 * have to try them all.
5415 */
3273699d 5416 (void) consumer_flush_channel(socket, buf_reg_chan->consumer_key);
ce34fcd0
MD
5417 }
5418
5419 ust_session_reg = reg->registry->reg.ust;
5420 /* Push metadata. */
5421 (void) push_metadata(ust_session_reg, usess->consumer);
5422 }
ce34fcd0
MD
5423 break;
5424 }
5425 case LTTNG_BUFFER_PER_PID:
5426 {
5427 struct ust_app_session *ua_sess;
5428 struct lttng_ht_iter iter;
5429 struct ust_app *app;
5430
5431 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
5432 ua_sess = lookup_session_by_app(usess, app);
5433 if (ua_sess == NULL) {
5434 continue;
5435 }
5436 (void) ust_app_flush_app_session(app, ua_sess);
5437 }
5438 break;
5439 }
5440 default:
99b1411c 5441 ret = -1;
a0377dfe 5442 abort();
ce34fcd0 5443 break;
c4b88406 5444 }
c4b88406 5445
7db205b5 5446 rcu_read_unlock();
840cb59c 5447 health_code_update();
c4b88406 5448 return ret;
8be98f9a
MD
5449}
5450
0dd01979
MD
5451static
5452int ust_app_clear_quiescent_app_session(struct ust_app *app,
5453 struct ust_app_session *ua_sess)
5454{
5455 int ret = 0;
5456 struct lttng_ht_iter iter;
5457 struct ust_app_channel *ua_chan;
5458 struct consumer_socket *socket;
5459
5460 DBG("Clearing stream quiescent state for ust app pid %d", app->pid);
5461
5462 rcu_read_lock();
5463
5464 if (!app->compatible) {
5465 goto end_not_compatible;
5466 }
5467
5468 pthread_mutex_lock(&ua_sess->lock);
5469
5470 if (ua_sess->deleted) {
5471 goto end_unlock;
5472 }
5473
5474 health_code_update();
5475
5476 socket = consumer_find_socket_by_bitness(app->bits_per_long,
5477 ua_sess->consumer);
5478 if (!socket) {
5479 ERR("Failed to find consumer (%" PRIu32 ") socket",
5480 app->bits_per_long);
5481 ret = -1;
5482 goto end_unlock;
5483 }
5484
5485 /* Clear quiescent state. */
5486 switch (ua_sess->buffer_type) {
5487 case LTTNG_BUFFER_PER_PID:
5488 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter,
5489 ua_chan, node.node) {
5490 health_code_update();
5491 ret = consumer_clear_quiescent_channel(socket,
5492 ua_chan->key);
5493 if (ret) {
5494 ERR("Error clearing quiescent state for consumer channel");
5495 ret = -1;
5496 continue;
5497 }
5498 }
5499 break;
5500 case LTTNG_BUFFER_PER_UID:
5501 default:
a0377dfe 5502 abort();
0dd01979
MD
5503 ret = -1;
5504 break;
5505 }
5506
5507 health_code_update();
5508
5509end_unlock:
5510 pthread_mutex_unlock(&ua_sess->lock);
5511
5512end_not_compatible:
5513 rcu_read_unlock();
5514 health_code_update();
5515 return ret;
5516}
5517
5518/*
5519 * Clear quiescent state in each stream for all applications for a
5520 * specific UST session.
5521 * Called with UST session lock held.
5522 */
5523static
5524int ust_app_clear_quiescent_session(struct ltt_ust_session *usess)
5525
5526{
5527 int ret = 0;
5528
5529 DBG("Clearing stream quiescent state for all ust apps");
5530
5531 rcu_read_lock();
5532
5533 switch (usess->buffer_type) {
5534 case LTTNG_BUFFER_PER_UID:
5535 {
5536 struct lttng_ht_iter iter;
5537 struct buffer_reg_uid *reg;
5538
5539 /*
5540 * Clear quiescent for all per UID buffers associated to
5541 * that session.
5542 */
5543 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
5544 struct consumer_socket *socket;
3273699d 5545 struct buffer_reg_channel *buf_reg_chan;
0dd01979
MD
5546
5547 /* Get associated consumer socket.*/
5548 socket = consumer_find_socket_by_bitness(
5549 reg->bits_per_long, usess->consumer);
5550 if (!socket) {
5551 /*
5552 * Ignore request if no consumer is found for
5553 * the session.
5554 */
5555 continue;
5556 }
5557
5558 cds_lfht_for_each_entry(reg->registry->channels->ht,
3273699d 5559 &iter.iter, buf_reg_chan, node.node) {
0dd01979
MD
5560 /*
5561 * The following call will print error values so
5562 * the return code is of little importance
5563 * because whatever happens, we have to try them
5564 * all.
5565 */
5566 (void) consumer_clear_quiescent_channel(socket,
3273699d 5567 buf_reg_chan->consumer_key);
0dd01979
MD
5568 }
5569 }
5570 break;
5571 }
5572 case LTTNG_BUFFER_PER_PID:
5573 {
5574 struct ust_app_session *ua_sess;
5575 struct lttng_ht_iter iter;
5576 struct ust_app *app;
5577
5578 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app,
5579 pid_n.node) {
5580 ua_sess = lookup_session_by_app(usess, app);
5581 if (ua_sess == NULL) {
5582 continue;
5583 }
5584 (void) ust_app_clear_quiescent_app_session(app,
5585 ua_sess);
5586 }
5587 break;
5588 }
5589 default:
5590 ret = -1;
a0377dfe 5591 abort();
0dd01979
MD
5592 break;
5593 }
5594
5595 rcu_read_unlock();
5596 health_code_update();
5597 return ret;
5598}
5599
84cd17c6
MD
5600/*
5601 * Destroy a specific UST session in apps.
5602 */
3353de95 5603static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
84cd17c6 5604{
ffe60014 5605 int ret;
84cd17c6 5606 struct ust_app_session *ua_sess;
bec39940 5607 struct lttng_ht_iter iter;
d9bf3ca4 5608 struct lttng_ht_node_u64 *node;
84cd17c6 5609
852d0037 5610 DBG("Destroy tracing for ust app pid %d", app->pid);
84cd17c6
MD
5611
5612 rcu_read_lock();
5613
e0c7ec2b
DG
5614 if (!app->compatible) {
5615 goto end;
5616 }
5617
84cd17c6 5618 __lookup_session_by_app(usess, app, &iter);
d9bf3ca4 5619 node = lttng_ht_iter_get_node_u64(&iter);
84cd17c6 5620 if (node == NULL) {
d42f20df
DG
5621 /* Session is being or is deleted. */
5622 goto end;
84cd17c6
MD
5623 }
5624 ua_sess = caa_container_of(node, struct ust_app_session, node);
c4a1715b 5625
840cb59c 5626 health_code_update();
d0b96690 5627 destroy_app_session(app, ua_sess);
84cd17c6 5628
840cb59c 5629 health_code_update();
7db205b5 5630
84cd17c6 5631 /* Quiescent wait after stopping trace */
fb45065e 5632 pthread_mutex_lock(&app->sock_lock);
b623cb6a 5633 ret = lttng_ust_ctl_wait_quiescent(app->sock);
fb45065e 5634 pthread_mutex_unlock(&app->sock_lock);
be355079
JR
5635 if (ret < 0) {
5636 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
9324443a 5637 DBG3("UST app wait quiescent failed. Application is dead: pid= %d, sock = %d",
be355079
JR
5638 app->pid, app->sock);
5639 } else if (ret == -EAGAIN) {
9324443a 5640 WARN("UST app wait quiescent failed. Communication time out: pid= %d, sock = %d",
be355079
JR
5641 app->pid, app->sock);
5642 } else {
9324443a 5643 ERR("UST app wait quiescent failed with ret %d: pid= %d, sock = %d",
be355079
JR
5644 ret, app->pid, app->sock);
5645 }
ffe60014 5646 }
e0c7ec2b
DG
5647end:
5648 rcu_read_unlock();
840cb59c 5649 health_code_update();
84cd17c6 5650 return 0;
84cd17c6
MD
5651}
5652
5b4a0ec0
DG
5653/*
5654 * Start tracing for the UST session.
5655 */
421cb601
DG
5656int ust_app_start_trace_all(struct ltt_ust_session *usess)
5657{
bec39940 5658 struct lttng_ht_iter iter;
421cb601 5659 struct ust_app *app;
48842b30 5660
421cb601
DG
5661 DBG("Starting all UST traces");
5662
bb2452c8
MD
5663 /*
5664 * Even though the start trace might fail, flag this session active so
5665 * other application coming in are started by default.
5666 */
5667 usess->active = 1;
5668
421cb601 5669 rcu_read_lock();
421cb601 5670
0dd01979
MD
5671 /*
5672 * In a start-stop-start use-case, we need to clear the quiescent state
5673 * of each channel set by the prior stop command, thus ensuring that a
5674 * following stop or destroy is sure to grab a timestamp_end near those
5675 * operations, even if the packet is empty.
5676 */
5677 (void) ust_app_clear_quiescent_session(usess);
5678
0498a00c
MD
5679 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
5680 ust_app_global_update(usess, app);
5681 }
5682
48842b30
DG
5683 rcu_read_unlock();
5684
5685 return 0;
5686}
487cf67c 5687
8be98f9a
MD
5688/*
5689 * Start tracing for the UST session.
ce34fcd0 5690 * Called with UST session lock held.
8be98f9a
MD
5691 */
5692int ust_app_stop_trace_all(struct ltt_ust_session *usess)
5693{
5694 int ret = 0;
bec39940 5695 struct lttng_ht_iter iter;
8be98f9a
MD
5696 struct ust_app *app;
5697
5698 DBG("Stopping all UST traces");
5699
bb2452c8
MD
5700 /*
5701 * Even though the stop trace might fail, flag this session inactive so
5702 * other application coming in are not started by default.
5703 */
5704 usess->active = 0;
5705
8be98f9a
MD
5706 rcu_read_lock();
5707
b34cbebf
MD
5708 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
5709 ret = ust_app_stop_trace(usess, app);
5710 if (ret < 0) {
5711 /* Continue to next apps even on error */
5712 continue;
5713 }
5714 }
5715
ce34fcd0 5716 (void) ust_app_flush_session(usess);
8be98f9a
MD
5717
5718 rcu_read_unlock();
5719
5720 return 0;
5721}
5722
84cd17c6
MD
5723/*
5724 * Destroy app UST session.
5725 */
5726int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
5727{
5728 int ret = 0;
bec39940 5729 struct lttng_ht_iter iter;
84cd17c6
MD
5730 struct ust_app *app;
5731
5732 DBG("Destroy all UST traces");
5733
5734 rcu_read_lock();
5735
852d0037 5736 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
3353de95 5737 ret = destroy_trace(usess, app);
84cd17c6
MD
5738 if (ret < 0) {
5739 /* Continue to next apps even on error */
5740 continue;
5741 }
5742 }
5743
5744 rcu_read_unlock();
5745
5746 return 0;
5747}
5748
88e3c2f5 5749/* The ua_sess lock must be held by the caller. */
a9ad0c8f 5750static
88e3c2f5
JG
5751int find_or_create_ust_app_channel(
5752 struct ltt_ust_session *usess,
5753 struct ust_app_session *ua_sess,
5754 struct ust_app *app,
5755 struct ltt_ust_channel *uchan,
5756 struct ust_app_channel **ua_chan)
487cf67c 5757{
55c54cce 5758 int ret = 0;
88e3c2f5
JG
5759 struct lttng_ht_iter iter;
5760 struct lttng_ht_node_str *ua_chan_node;
5761
5762 lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &iter);
5763 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
5764 if (ua_chan_node) {
5765 *ua_chan = caa_container_of(ua_chan_node,
5766 struct ust_app_channel, node);
5767 goto end;
5768 }
5769
5770 ret = ust_app_channel_create(usess, ua_sess, uchan, app, ua_chan);
5771 if (ret) {
5772 goto end;
5773 }
5774end:
5775 return ret;
5776}
5777
5778static
5779int ust_app_channel_synchronize_event(struct ust_app_channel *ua_chan,
f46376a1 5780 struct ltt_ust_event *uevent,
88e3c2f5
JG
5781 struct ust_app *app)
5782{
5783 int ret = 0;
5784 struct ust_app_event *ua_event = NULL;
5785
5786 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
5787 uevent->filter, uevent->attr.loglevel, uevent->exclusion);
5788 if (!ua_event) {
f46376a1 5789 ret = create_ust_app_event(ua_chan, uevent, app);
88e3c2f5
JG
5790 if (ret < 0) {
5791 goto end;
5792 }
5793 } else {
5794 if (ua_event->enabled != uevent->enabled) {
5795 ret = uevent->enabled ?
f46376a1
MJ
5796 enable_ust_app_event(ua_event, app) :
5797 disable_ust_app_event(ua_event, app);
88e3c2f5
JG
5798 }
5799 }
5800
5801end:
5802 return ret;
5803}
5804
993578ff
JR
5805/* Called with RCU read-side lock held. */
5806static
5807void ust_app_synchronize_event_notifier_rules(struct ust_app *app)
5808{
5809 int ret = 0;
5810 enum lttng_error_code ret_code;
5811 enum lttng_trigger_status t_status;
5812 struct lttng_ht_iter app_trigger_iter;
5813 struct lttng_triggers *triggers = NULL;
5814 struct ust_app_event_notifier_rule *event_notifier_rule;
5815 unsigned int count, i;
5816
48b7cdc2
FD
5817 ASSERT_RCU_READ_LOCKED();
5818
783db316
MD
5819 if (!ust_app_supports_notifiers(app)) {
5820 goto end;
5821 }
5822
993578ff
JR
5823 /*
5824 * Currrently, registering or unregistering a trigger with an
5825 * event rule condition causes a full synchronization of the event
5826 * notifiers.
5827 *
5828 * The first step attempts to add an event notifier for all registered
5829 * triggers that apply to the user space tracers. Then, the
5830 * application's event notifiers rules are all checked against the list
5831 * of registered triggers. Any event notifier that doesn't have a
5832 * matching trigger can be assumed to have been disabled.
5833 *
5834 * All of this is inefficient, but is put in place to get the feature
5835 * rolling as it is simpler at this moment. It will be optimized Soon™
5836 * to allow the state of enabled
5837 * event notifiers to be synchronized in a piece-wise way.
5838 */
5839
5840 /* Get all triggers using uid 0 (root) */
5841 ret_code = notification_thread_command_list_triggers(
412d7227 5842 the_notification_thread_handle, 0, &triggers);
993578ff 5843 if (ret_code != LTTNG_OK) {
993578ff
JR
5844 goto end;
5845 }
5846
a0377dfe 5847 LTTNG_ASSERT(triggers);
993578ff
JR
5848
5849 t_status = lttng_triggers_get_count(triggers, &count);
5850 if (t_status != LTTNG_TRIGGER_STATUS_OK) {
993578ff
JR
5851 goto end;
5852 }
5853
5854 for (i = 0; i < count; i++) {
5855 struct lttng_condition *condition;
5856 struct lttng_event_rule *event_rule;
5857 struct lttng_trigger *trigger;
5858 const struct ust_app_event_notifier_rule *looked_up_event_notifier_rule;
5859 enum lttng_condition_status condition_status;
5860 uint64_t token;
5861
5862 trigger = lttng_triggers_borrow_mutable_at_index(triggers, i);
a0377dfe 5863 LTTNG_ASSERT(trigger);
993578ff
JR
5864
5865 token = lttng_trigger_get_tracer_token(trigger);
5866 condition = lttng_trigger_get_condition(trigger);
5867
8dbb86b8
JR
5868 if (lttng_condition_get_type(condition) !=
5869 LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES) {
993578ff
JR
5870 /* Does not apply */
5871 continue;
5872 }
5873
8dbb86b8
JR
5874 condition_status =
5875 lttng_condition_event_rule_matches_borrow_rule_mutable(
5876 condition, &event_rule);
a0377dfe 5877 LTTNG_ASSERT(condition_status == LTTNG_CONDITION_STATUS_OK);
993578ff
JR
5878
5879 if (lttng_event_rule_get_domain_type(event_rule) == LTTNG_DOMAIN_KERNEL) {
5880 /* Skip kernel related triggers. */
5881 continue;
5882 }
5883
5884 /*
5885 * Find or create the associated token event rule. The caller
5886 * holds the RCU read lock, so this is safe to call without
5887 * explicitly acquiring it here.
5888 */
5889 looked_up_event_notifier_rule = find_ust_app_event_notifier_rule(
5890 app->token_to_event_notifier_rule_ht, token);
5891 if (!looked_up_event_notifier_rule) {
267d66aa 5892 ret = create_ust_app_event_notifier_rule(trigger, app);
993578ff
JR
5893 if (ret < 0) {
5894 goto end;
5895 }
5896 }
5897 }
5898
5899 rcu_read_lock();
5900 /* Remove all unknown event sources from the app. */
5901 cds_lfht_for_each_entry (app->token_to_event_notifier_rule_ht->ht,
5902 &app_trigger_iter.iter, event_notifier_rule,
5903 node.node) {
5904 const uint64_t app_token = event_notifier_rule->token;
5905 bool found = false;
5906
5907 /*
5908 * Check if the app event trigger still exists on the
5909 * notification side.
5910 */
5911 for (i = 0; i < count; i++) {
5912 uint64_t notification_thread_token;
5913 const struct lttng_trigger *trigger =
5914 lttng_triggers_get_at_index(
5915 triggers, i);
5916
a0377dfe 5917 LTTNG_ASSERT(trigger);
993578ff
JR
5918
5919 notification_thread_token =
5920 lttng_trigger_get_tracer_token(trigger);
5921
5922 if (notification_thread_token == app_token) {
5923 found = true;
5924 break;
5925 }
5926 }
5927
5928 if (found) {
5929 /* Still valid. */
5930 continue;
5931 }
5932
5933 /*
5934 * This trigger was unregistered, disable it on the tracer's
5935 * side.
5936 */
5937 ret = lttng_ht_del(app->token_to_event_notifier_rule_ht,
5938 &app_trigger_iter);
a0377dfe 5939 LTTNG_ASSERT(ret == 0);
993578ff
JR
5940
5941 /* Callee logs errors. */
5942 (void) disable_ust_object(app, event_notifier_rule->obj);
5943
5944 delete_ust_app_event_notifier_rule(
5945 app->sock, event_notifier_rule, app);
5946 }
5947
5948 rcu_read_unlock();
5949
5950end:
5951 lttng_triggers_destroy(triggers);
5952 return;
5953}
5954
88e3c2f5 5955/*
a84d1024 5956 * RCU read lock must be held by the caller.
88e3c2f5
JG
5957 */
5958static
a84d1024
FD
5959void ust_app_synchronize_all_channels(struct ltt_ust_session *usess,
5960 struct ust_app_session *ua_sess,
88e3c2f5
JG
5961 struct ust_app *app)
5962{
5963 int ret = 0;
5964 struct cds_lfht_iter uchan_iter;
5965 struct ltt_ust_channel *uchan;
1f3580c7 5966
a0377dfe
FD
5967 LTTNG_ASSERT(usess);
5968 LTTNG_ASSERT(ua_sess);
5969 LTTNG_ASSERT(app);
48b7cdc2 5970 ASSERT_RCU_READ_LOCKED();
ef67c072 5971
88e3c2f5
JG
5972 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &uchan_iter,
5973 uchan, node.node) {
5974 struct ust_app_channel *ua_chan;
5975 struct cds_lfht_iter uevent_iter;
5976 struct ltt_ust_event *uevent;
487cf67c 5977
31746f93 5978 /*
88e3c2f5
JG
5979 * Search for a matching ust_app_channel. If none is found,
5980 * create it. Creating the channel will cause the ua_chan
5981 * structure to be allocated, the channel buffers to be
5982 * allocated (if necessary) and sent to the application, and
5983 * all enabled contexts will be added to the channel.
31746f93 5984 */
f3db82be 5985 ret = find_or_create_ust_app_channel(usess, ua_sess,
88e3c2f5
JG
5986 app, uchan, &ua_chan);
5987 if (ret) {
5988 /* Tracer is probably gone or ENOMEM. */
a84d1024 5989 goto end;
727d5404
DG
5990 }
5991
88e3c2f5
JG
5992 if (!ua_chan) {
5993 /* ua_chan will be NULL for the metadata channel */
5994 continue;
5995 }
727d5404 5996
88e3c2f5 5997 cds_lfht_for_each_entry(uchan->events->ht, &uevent_iter, uevent,
bec39940 5998 node.node) {
88e3c2f5 5999 ret = ust_app_channel_synchronize_event(ua_chan,
f46376a1 6000 uevent, app);
88e3c2f5 6001 if (ret) {
a84d1024 6002 goto end;
487cf67c 6003 }
36dc12cc 6004 }
d0b96690 6005
88e3c2f5
JG
6006 if (ua_chan->enabled != uchan->enabled) {
6007 ret = uchan->enabled ?
6008 enable_ust_app_channel(ua_sess, uchan, app) :
6009 disable_ust_app_channel(ua_sess, ua_chan, app);
6010 if (ret) {
a84d1024 6011 goto end;
88e3c2f5
JG
6012 }
6013 }
36dc12cc 6014 }
a84d1024
FD
6015end:
6016 return;
6017}
6018
6019/*
6020 * The caller must ensure that the application is compatible and is tracked
6021 * by the process attribute trackers.
6022 */
6023static
6024void ust_app_synchronize(struct ltt_ust_session *usess,
6025 struct ust_app *app)
6026{
6027 int ret = 0;
6028 struct ust_app_session *ua_sess = NULL;
6029
6030 /*
6031 * The application's configuration should only be synchronized for
6032 * active sessions.
6033 */
a0377dfe 6034 LTTNG_ASSERT(usess->active);
a84d1024
FD
6035
6036 ret = find_or_create_ust_app_session(usess, app, &ua_sess, NULL);
6037 if (ret < 0) {
6038 /* Tracer is probably gone or ENOMEM. */
50f71cad
FD
6039 if (ua_sess) {
6040 destroy_app_session(app, ua_sess);
6041 }
6042 goto end;
a84d1024 6043 }
a0377dfe 6044 LTTNG_ASSERT(ua_sess);
a84d1024
FD
6045
6046 pthread_mutex_lock(&ua_sess->lock);
6047 if (ua_sess->deleted) {
50f71cad 6048 goto deleted_session;
a84d1024
FD
6049 }
6050
6051 rcu_read_lock();
6052
6053 ust_app_synchronize_all_channels(usess, ua_sess, app);
ef67c072
JG
6054
6055 /*
6056 * Create the metadata for the application. This returns gracefully if a
6057 * metadata was already set for the session.
6058 *
6059 * The metadata channel must be created after the data channels as the
6060 * consumer daemon assumes this ordering. When interacting with a relay
6061 * daemon, the consumer will use this assumption to send the
6062 * "STREAMS_SENT" message to the relay daemon.
6063 */
6064 ret = create_ust_app_metadata(ua_sess, app, usess->consumer);
6065 if (ret < 0) {
50f71cad
FD
6066 ERR("Metadata creation failed for app sock %d for session id %" PRIu64,
6067 app->sock, usess->id);
ef67c072
JG
6068 }
6069
88e3c2f5 6070 rcu_read_unlock();
0498a00c 6071
50f71cad 6072deleted_session:
d0b96690 6073 pthread_mutex_unlock(&ua_sess->lock);
50f71cad 6074end:
487cf67c
DG
6075 return;
6076}
55cc08a6 6077
a9ad0c8f
MD
6078static
6079void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app)
6080{
6081 struct ust_app_session *ua_sess;
6082
6083 ua_sess = lookup_session_by_app(usess, app);
6084 if (ua_sess == NULL) {
6085 return;
6086 }
6087 destroy_app_session(app, ua_sess);
6088}
6089
6090/*
6091 * Add channels/events from UST global domain to registered apps at sock.
6092 *
6093 * Called with session lock held.
6094 * Called with RCU read-side lock held.
6095 */
6096void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app)
6097{
a0377dfe
FD
6098 LTTNG_ASSERT(usess);
6099 LTTNG_ASSERT(usess->active);
48b7cdc2 6100 ASSERT_RCU_READ_LOCKED();
a9ad0c8f
MD
6101
6102 DBG2("UST app global update for app sock %d for session id %" PRIu64,
6103 app->sock, usess->id);
6104
6105 if (!app->compatible) {
6106 return;
6107 }
159b042f
JG
6108 if (trace_ust_id_tracker_lookup(LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID,
6109 usess, app->pid) &&
55c9e7ca 6110 trace_ust_id_tracker_lookup(
159b042f
JG
6111 LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID,
6112 usess, app->uid) &&
55c9e7ca 6113 trace_ust_id_tracker_lookup(
159b042f
JG
6114 LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID,
6115 usess, app->gid)) {
88e3c2f5
JG
6116 /*
6117 * Synchronize the application's internal tracing configuration
6118 * and start tracing.
6119 */
6120 ust_app_synchronize(usess, app);
6121 ust_app_start_trace(usess, app);
a9ad0c8f
MD
6122 } else {
6123 ust_app_global_destroy(usess, app);
6124 }
6125}
6126
993578ff
JR
6127/*
6128 * Add all event notifiers to an application.
6129 *
6130 * Called with session lock held.
6131 * Called with RCU read-side lock held.
6132 */
6133void ust_app_global_update_event_notifier_rules(struct ust_app *app)
6134{
48b7cdc2
FD
6135 ASSERT_RCU_READ_LOCKED();
6136
9324443a 6137 DBG2("UST application global event notifier rules update: app = '%s', pid = %d",
be355079 6138 app->name, app->pid);
993578ff 6139
783db316 6140 if (!app->compatible || !ust_app_supports_notifiers(app)) {
993578ff
JR
6141 return;
6142 }
6143
6144 if (app->event_notifier_group.object == NULL) {
9324443a 6145 WARN("UST app global update of event notifiers for app skipped since communication handle is null: app = '%s', pid = %d",
be355079 6146 app->name, app->pid);
993578ff
JR
6147 return;
6148 }
6149
6150 ust_app_synchronize_event_notifier_rules(app);
6151}
6152
a9ad0c8f
MD
6153/*
6154 * Called with session lock held.
6155 */
6156void ust_app_global_update_all(struct ltt_ust_session *usess)
6157{
6158 struct lttng_ht_iter iter;
6159 struct ust_app *app;
6160
6161 rcu_read_lock();
6162 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
6163 ust_app_global_update(usess, app);
6164 }
6165 rcu_read_unlock();
6166}
6167
993578ff
JR
6168void ust_app_global_update_all_event_notifier_rules(void)
6169{
6170 struct lttng_ht_iter iter;
6171 struct ust_app *app;
6172
6173 rcu_read_lock();
6174 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
6175 ust_app_global_update_event_notifier_rules(app);
6176 }
6177
6178 rcu_read_unlock();
6179}
6180
55cc08a6
DG
6181/*
6182 * Add context to a specific channel for global UST domain.
6183 */
6184int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
6185 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
6186{
6187 int ret = 0;
bec39940
DG
6188 struct lttng_ht_node_str *ua_chan_node;
6189 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
6190 struct ust_app_channel *ua_chan = NULL;
6191 struct ust_app_session *ua_sess;
6192 struct ust_app *app;
6193
a0377dfe 6194 LTTNG_ASSERT(usess->active);
0498a00c 6195
55cc08a6 6196 rcu_read_lock();
852d0037 6197 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
6198 if (!app->compatible) {
6199 /*
6200 * TODO: In time, we should notice the caller of this error by
6201 * telling him that this is a version error.
6202 */
6203 continue;
6204 }
55cc08a6
DG
6205 ua_sess = lookup_session_by_app(usess, app);
6206 if (ua_sess == NULL) {
6207 continue;
6208 }
6209
d0b96690 6210 pthread_mutex_lock(&ua_sess->lock);
b161602a
MD
6211
6212 if (ua_sess->deleted) {
6213 pthread_mutex_unlock(&ua_sess->lock);
6214 continue;
6215 }
6216
55cc08a6 6217 /* Lookup channel in the ust app session */
bec39940
DG
6218 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
6219 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6 6220 if (ua_chan_node == NULL) {
d0b96690 6221 goto next_app;
55cc08a6
DG
6222 }
6223 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
6224 node);
c9edf082 6225 ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app);
55cc08a6 6226 if (ret < 0) {
d0b96690 6227 goto next_app;
55cc08a6 6228 }
d0b96690
DG
6229 next_app:
6230 pthread_mutex_unlock(&ua_sess->lock);
55cc08a6
DG
6231 }
6232
55cc08a6 6233 rcu_read_unlock();
76d45b40
DG
6234 return ret;
6235}
7f79d3a1 6236
d0b96690
DG
6237/*
6238 * Receive registration and populate the given msg structure.
6239 *
6240 * On success return 0 else a negative value returned by the ustctl call.
6241 */
6242int ust_app_recv_registration(int sock, struct ust_register_msg *msg)
6243{
6244 int ret;
6245 uint32_t pid, ppid, uid, gid;
6246
a0377dfe 6247 LTTNG_ASSERT(msg);
d0b96690 6248
b623cb6a 6249 ret = lttng_ust_ctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor,
d0b96690
DG
6250 &pid, &ppid, &uid, &gid,
6251 &msg->bits_per_long,
6252 &msg->uint8_t_alignment,
6253 &msg->uint16_t_alignment,
6254 &msg->uint32_t_alignment,
6255 &msg->uint64_t_alignment,
6256 &msg->long_alignment,
6257 &msg->byte_order,
6258 msg->name);
6259 if (ret < 0) {
6260 switch (-ret) {
6261 case EPIPE:
6262 case ECONNRESET:
6263 case LTTNG_UST_ERR_EXITING:
6264 DBG3("UST app recv reg message failed. Application died");
6265 break;
6266 case LTTNG_UST_ERR_UNSUP_MAJOR:
6267 ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d",
6268 msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION,
6269 LTTNG_UST_ABI_MINOR_VERSION);
6270 break;
6271 default:
6272 ERR("UST app recv reg message failed with ret %d", ret);
6273 break;
6274 }
6275 goto error;
6276 }
6277 msg->pid = (pid_t) pid;
6278 msg->ppid = (pid_t) ppid;
6279 msg->uid = (uid_t) uid;
6280 msg->gid = (gid_t) gid;
6281
6282error:
6283 return ret;
6284}
6285
10b56aef
MD
6286/*
6287 * Return a ust app session object using the application object and the
6288 * session object descriptor has a key. If not found, NULL is returned.
6289 * A RCU read side lock MUST be acquired when calling this function.
6290*/
6291static struct ust_app_session *find_session_by_objd(struct ust_app *app,
6292 int objd)
6293{
6294 struct lttng_ht_node_ulong *node;
6295 struct lttng_ht_iter iter;
6296 struct ust_app_session *ua_sess = NULL;
6297
a0377dfe 6298 LTTNG_ASSERT(app);
48b7cdc2 6299 ASSERT_RCU_READ_LOCKED();
10b56aef
MD
6300
6301 lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter);
6302 node = lttng_ht_iter_get_node_ulong(&iter);
6303 if (node == NULL) {
6304 DBG2("UST app session find by objd %d not found", objd);
6305 goto error;
6306 }
6307
6308 ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node);
6309
6310error:
6311 return ua_sess;
6312}
6313
d88aee68
DG
6314/*
6315 * Return a ust app channel object using the application object and the channel
6316 * object descriptor has a key. If not found, NULL is returned. A RCU read side
6317 * lock MUST be acquired before calling this function.
6318 */
d0b96690
DG
6319static struct ust_app_channel *find_channel_by_objd(struct ust_app *app,
6320 int objd)
6321{
6322 struct lttng_ht_node_ulong *node;
6323 struct lttng_ht_iter iter;
6324 struct ust_app_channel *ua_chan = NULL;
6325
a0377dfe 6326 LTTNG_ASSERT(app);
48b7cdc2 6327 ASSERT_RCU_READ_LOCKED();
d0b96690
DG
6328
6329 lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter);
6330 node = lttng_ht_iter_get_node_ulong(&iter);
6331 if (node == NULL) {
6332 DBG2("UST app channel find by objd %d not found", objd);
6333 goto error;
6334 }
6335
6336 ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node);
6337
6338error:
6339 return ua_chan;
6340}
6341
c559ee63
MD
6342/*
6343 * Fixup legacy context fields for comparison:
6344 * - legacy array becomes array_nestable,
6345 * - legacy struct becomes struct_nestable,
6346 * - legacy variant becomes variant_nestable,
6347 * legacy sequences are not emitted in LTTng-UST contexts.
6348 */
6349static int ust_app_fixup_legacy_context_fields(size_t *_nr_fields,
6350 struct lttng_ust_ctl_field **_fields)
6351{
6352 struct lttng_ust_ctl_field *fields = *_fields, *new_fields = NULL;
6353 size_t nr_fields = *_nr_fields, new_nr_fields = 0, i, j;
6354 bool found = false;
6355 int ret = 0;
6356
6357 for (i = 0; i < nr_fields; i++) {
6358 const struct lttng_ust_ctl_field *field = &fields[i];
6359
6360 switch (field->type.atype) {
6361 case lttng_ust_ctl_atype_sequence:
6362 ERR("Unexpected legacy sequence context.");
6363 ret = -EINVAL;
6364 goto end;
6365 case lttng_ust_ctl_atype_array:
6366 switch (field->type.u.legacy.array.elem_type.atype) {
6367 case lttng_ust_ctl_atype_integer:
6368 break;
6369 default:
6370 ERR("Unexpected legacy array element type in context.");
6371 ret = -EINVAL;
6372 goto end;
6373 }
6374 found = true;
6375 /* One field for array_nested, one field for elem type. */
6376 new_nr_fields += 2;
6377 break;
6378
6379 case lttng_ust_ctl_atype_struct: /* Fallthrough */
6380 case lttng_ust_ctl_atype_variant:
6381 found = true;
6382 new_nr_fields++;
6383 break;
6384 default:
6385 new_nr_fields++;
6386 break;
6387 }
6388 }
6389 if (!found) {
6390 goto end;
6391 }
64803277
SM
6392
6393 new_fields = calloc<lttng_ust_ctl_field>(new_nr_fields);
c559ee63
MD
6394 if (!new_fields) {
6395 ret = -ENOMEM;
6396 goto end;
6397 }
64803277 6398
c559ee63
MD
6399 for (i = 0, j = 0; i < nr_fields; i++, j++) {
6400 const struct lttng_ust_ctl_field *field = &fields[i];
6401 struct lttng_ust_ctl_field *new_field = &new_fields[j];
6402
6403 switch (field->type.atype) {
6404 case lttng_ust_ctl_atype_array:
6405 /* One field for array_nested, one field for elem type. */
6406 strncpy(new_field->name, field->name, LTTNG_UST_ABI_SYM_NAME_LEN - 1);
6407 new_field->type.atype = lttng_ust_ctl_atype_array_nestable;
6408 new_field->type.u.array_nestable.length = field->type.u.legacy.array.length;
6409 new_field->type.u.array_nestable.alignment = 0;
6410 new_field = &new_fields[++j]; /* elem type */
6411 new_field->type.atype = field->type.u.legacy.array.elem_type.atype;
6412 assert(new_field->type.atype == lttng_ust_ctl_atype_integer);
6413 new_field->type.u.integer = field->type.u.legacy.array.elem_type.u.basic.integer;
6414 break;
6415 case lttng_ust_ctl_atype_struct:
6416 strncpy(new_field->name, field->name, LTTNG_UST_ABI_SYM_NAME_LEN - 1);
6417 new_field->type.atype = lttng_ust_ctl_atype_struct_nestable;
6418 new_field->type.u.struct_nestable.nr_fields = field->type.u.legacy._struct.nr_fields;
6419 new_field->type.u.struct_nestable.alignment = 0;
6420 break;
6421 case lttng_ust_ctl_atype_variant:
6422 strncpy(new_field->name, field->name, LTTNG_UST_ABI_SYM_NAME_LEN - 1);
6423 new_field->type.atype = lttng_ust_ctl_atype_variant_nestable;
6424 new_field->type.u.variant_nestable.nr_choices = field->type.u.legacy.variant.nr_choices;
6425 strncpy(new_field->type.u.variant_nestable.tag_name,
6426 field->type.u.legacy.variant.tag_name,
6427 LTTNG_UST_ABI_SYM_NAME_LEN - 1);
6428 new_field->type.u.variant_nestable.alignment = 0;
6429 break;
6430 default:
6431 *new_field = *field;
6432 break;
6433 }
6434 }
6435 free(fields);
6436 *_fields = new_fields;
6437 *_nr_fields = new_nr_fields;
6438end:
6439 return ret;
6440}
6441
d88aee68
DG
6442/*
6443 * Reply to a register channel notification from an application on the notify
6444 * socket. The channel metadata is also created.
6445 *
6446 * The session UST registry lock is acquired in this function.
6447 *
6448 * On success 0 is returned else a negative value.
6449 */
8eede835 6450static int reply_ust_register_channel(int sock, int cobjd,
b623cb6a 6451 size_t nr_fields, struct lttng_ust_ctl_field *fields)
d0b96690
DG
6452{
6453 int ret, ret_code = 0;
294e218e 6454 uint32_t chan_id;
7972aab2 6455 uint64_t chan_reg_key;
c559ee63 6456 enum lttng_ust_ctl_channel_header type = LTTNG_UST_CTL_CHANNEL_HEADER_UNKNOWN;
d0b96690
DG
6457 struct ust_app *app;
6458 struct ust_app_channel *ua_chan;
6459 struct ust_app_session *ua_sess;
7972aab2 6460 struct ust_registry_session *registry;
3273699d 6461 struct ust_registry_channel *ust_reg_chan;
d0b96690
DG
6462
6463 rcu_read_lock();
6464
6465 /* Lookup application. If not found, there is a code flow error. */
6466 app = find_app_by_notify_sock(sock);
d88aee68 6467 if (!app) {
fad1ed2f 6468 DBG("Application socket %d is being torn down. Abort event notify",
d88aee68 6469 sock);
48c77bf7 6470 ret = -1;
d88aee68
DG
6471 goto error_rcu_unlock;
6472 }
d0b96690 6473
4950b860 6474 /* Lookup channel by UST object descriptor. */
d0b96690 6475 ua_chan = find_channel_by_objd(app, cobjd);
4950b860 6476 if (!ua_chan) {
fad1ed2f 6477 DBG("Application channel is being torn down. Abort event notify");
4950b860
MD
6478 ret = 0;
6479 goto error_rcu_unlock;
6480 }
6481
a0377dfe 6482 LTTNG_ASSERT(ua_chan->session);
d0b96690 6483 ua_sess = ua_chan->session;
d0b96690 6484
7972aab2
DG
6485 /* Get right session registry depending on the session buffer type. */
6486 registry = get_session_registry(ua_sess);
fad1ed2f
JR
6487 if (!registry) {
6488 DBG("Application session is being torn down. Abort event notify");
6489 ret = 0;
6490 goto error_rcu_unlock;
6491 };
45893984 6492
7972aab2
DG
6493 /* Depending on the buffer type, a different channel key is used. */
6494 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) {
6495 chan_reg_key = ua_chan->tracing_channel_id;
d0b96690 6496 } else {
7972aab2 6497 chan_reg_key = ua_chan->key;
d0b96690
DG
6498 }
6499
7972aab2
DG
6500 pthread_mutex_lock(&registry->lock);
6501
3273699d 6502 ust_reg_chan = ust_registry_channel_find(registry, chan_reg_key);
a0377dfe 6503 LTTNG_ASSERT(ust_reg_chan);
7972aab2 6504
fb277293
MD
6505 /* Channel id is set during the object creation. */
6506 chan_id = ust_reg_chan->chan_id;
6507
c559ee63
MD
6508 ret = ust_app_fixup_legacy_context_fields(&nr_fields, &fields);
6509 if (ret < 0) {
6510 ERR("Registering application channel due to legacy context fields fixup error: pid = %d, sock = %d",
6511 app->pid, app->sock);
6512 ret_code = -EINVAL;
6513 goto reply;
6514 }
3273699d 6515 if (!ust_reg_chan->register_done) {
294e218e
MD
6516 /*
6517 * TODO: eventually use the registry event count for
6518 * this channel to better guess header type for per-pid
6519 * buffers.
6520 */
b623cb6a 6521 type = LTTNG_UST_CTL_CHANNEL_HEADER_LARGE;
3273699d
FD
6522 ust_reg_chan->nr_ctx_fields = nr_fields;
6523 ust_reg_chan->ctx_fields = fields;
fad1ed2f 6524 fields = NULL;
3273699d 6525 ust_reg_chan->header_type = type;
d0b96690 6526 } else {
7972aab2 6527 /* Get current already assigned values. */
3273699d 6528 type = ust_reg_chan->header_type;
fb277293
MD
6529 /*
6530 * Validate that the context fields match between
6531 * registry and newcoming application.
6532 */
6533 if (!match_lttng_ust_ctl_field_array(ust_reg_chan->ctx_fields,
6534 ust_reg_chan->nr_ctx_fields,
6535 fields, nr_fields)) {
6536 ERR("Registering application channel due to context field mismatch: pid = %d, sock = %d",
6537 app->pid, app->sock);
6538 ret_code = -EINVAL;
6539 goto reply;
6540 }
d0b96690 6541 }
d0b96690
DG
6542
6543 /* Append to metadata */
3273699d
FD
6544 if (!ust_reg_chan->metadata_dumped) {
6545 ret_code = ust_metadata_channel_statedump(registry, ust_reg_chan);
d0b96690
DG
6546 if (ret_code) {
6547 ERR("Error appending channel metadata (errno = %d)", ret_code);
6548 goto reply;
6549 }
6550 }
6551
6552reply:
7972aab2 6553 DBG3("UST app replying to register channel key %" PRIu64
be355079 6554 " with id %u, type = %d, ret = %d", chan_reg_key, chan_id, type,
7972aab2 6555 ret_code);
d0b96690 6556
b623cb6a 6557 ret = lttng_ust_ctl_reply_register_channel(sock, chan_id, type, ret_code);
d0b96690 6558 if (ret < 0) {
be355079
JR
6559 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
6560 DBG3("UST app reply channel failed. Application died: pid = %d, sock = %d",
6561 app->pid, app->sock);
6562 } else if (ret == -EAGAIN) {
6563 WARN("UST app reply channel failed. Communication time out: pid = %d, sock = %d",
6564 app->pid, app->sock);
d0b96690 6565 } else {
be355079
JR
6566 ERR("UST app reply channel failed with ret %d: pid = %d, sock = %d",
6567 ret, app->pid, app->sock);
d0b96690
DG
6568 }
6569 goto error;
6570 }
6571
7972aab2 6572 /* This channel registry registration is completed. */
3273699d 6573 ust_reg_chan->register_done = 1;
7972aab2 6574
d0b96690 6575error:
7972aab2 6576 pthread_mutex_unlock(&registry->lock);
d88aee68 6577error_rcu_unlock:
d0b96690 6578 rcu_read_unlock();
fad1ed2f 6579 free(fields);
d0b96690
DG
6580 return ret;
6581}
6582
d88aee68
DG
6583/*
6584 * Add event to the UST channel registry. When the event is added to the
6585 * registry, the metadata is also created. Once done, this replies to the
6586 * application with the appropriate error code.
6587 *
6588 * The session UST registry lock is acquired in the function.
6589 *
6590 * On success 0 is returned else a negative value.
6591 */
d0b96690 6592static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name,
b623cb6a 6593 char *sig, size_t nr_fields, struct lttng_ust_ctl_field *fields,
2106efa0 6594 int loglevel_value, char *model_emf_uri)
d0b96690
DG
6595{
6596 int ret, ret_code;
6597 uint32_t event_id = 0;
7972aab2 6598 uint64_t chan_reg_key;
d0b96690
DG
6599 struct ust_app *app;
6600 struct ust_app_channel *ua_chan;
6601 struct ust_app_session *ua_sess;
7972aab2 6602 struct ust_registry_session *registry;
d0b96690
DG
6603
6604 rcu_read_lock();
6605
6606 /* Lookup application. If not found, there is a code flow error. */
6607 app = find_app_by_notify_sock(sock);
d88aee68 6608 if (!app) {
fad1ed2f 6609 DBG("Application socket %d is being torn down. Abort event notify",
d88aee68 6610 sock);
48c77bf7 6611 ret = -1;
d88aee68
DG
6612 goto error_rcu_unlock;
6613 }
d0b96690 6614
4950b860 6615 /* Lookup channel by UST object descriptor. */
d0b96690 6616 ua_chan = find_channel_by_objd(app, cobjd);
4950b860 6617 if (!ua_chan) {
fad1ed2f 6618 DBG("Application channel is being torn down. Abort event notify");
4950b860
MD
6619 ret = 0;
6620 goto error_rcu_unlock;
6621 }
6622
a0377dfe 6623 LTTNG_ASSERT(ua_chan->session);
d0b96690
DG
6624 ua_sess = ua_chan->session;
6625
7972aab2 6626 registry = get_session_registry(ua_sess);
fad1ed2f
JR
6627 if (!registry) {
6628 DBG("Application session is being torn down. Abort event notify");
6629 ret = 0;
6630 goto error_rcu_unlock;
6631 }
7972aab2
DG
6632
6633 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) {
6634 chan_reg_key = ua_chan->tracing_channel_id;
6635 } else {
6636 chan_reg_key = ua_chan->key;
6637 }
6638
6639 pthread_mutex_lock(&registry->lock);
d0b96690 6640
d5d629b5
DG
6641 /*
6642 * From this point on, this call acquires the ownership of the sig, fields
6643 * and model_emf_uri meaning any free are done inside it if needed. These
6644 * three variables MUST NOT be read/write after this.
6645 */
7972aab2 6646 ret_code = ust_registry_create_event(registry, chan_reg_key,
2106efa0
PP
6647 sobjd, cobjd, name, sig, nr_fields, fields,
6648 loglevel_value, model_emf_uri, ua_sess->buffer_type,
6649 &event_id, app);
fad1ed2f
JR
6650 sig = NULL;
6651 fields = NULL;
6652 model_emf_uri = NULL;
d0b96690
DG
6653
6654 /*
6655 * The return value is returned to ustctl so in case of an error, the
6656 * application can be notified. In case of an error, it's important not to
6657 * return a negative error or else the application will get closed.
6658 */
b623cb6a 6659 ret = lttng_ust_ctl_reply_register_event(sock, event_id, ret_code);
d0b96690 6660 if (ret < 0) {
be355079
JR
6661 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
6662 DBG3("UST app reply event failed. Application died: pid = %d, sock = %d.",
6663 app->pid, app->sock);
6664 } else if (ret == -EAGAIN) {
6665 WARN("UST app reply event failed. Communication time out: pid = %d, sock = %d",
6666 app->pid, app->sock);
d0b96690 6667 } else {
be355079
JR
6668 ERR("UST app reply event failed with ret %d: pid = %d, sock = %d",
6669 ret, app->pid, app->sock);
d0b96690
DG
6670 }
6671 /*
6672 * No need to wipe the create event since the application socket will
6673 * get close on error hence cleaning up everything by itself.
6674 */
6675 goto error;
6676 }
6677
7972aab2
DG
6678 DBG3("UST registry event %s with id %" PRId32 " added successfully",
6679 name, event_id);
d88aee68 6680
d0b96690 6681error:
7972aab2 6682 pthread_mutex_unlock(&registry->lock);
d88aee68 6683error_rcu_unlock:
d0b96690 6684 rcu_read_unlock();
fad1ed2f
JR
6685 free(sig);
6686 free(fields);
6687 free(model_emf_uri);
d0b96690
DG
6688 return ret;
6689}
6690
10b56aef
MD
6691/*
6692 * Add enum to the UST session registry. Once done, this replies to the
6693 * application with the appropriate error code.
6694 *
6695 * The session UST registry lock is acquired within this function.
6696 *
6697 * On success 0 is returned else a negative value.
6698 */
6699static int add_enum_ust_registry(int sock, int sobjd, char *name,
b623cb6a 6700 struct lttng_ust_ctl_enum_entry *entries, size_t nr_entries)
10b56aef
MD
6701{
6702 int ret = 0, ret_code;
6703 struct ust_app *app;
6704 struct ust_app_session *ua_sess;
6705 struct ust_registry_session *registry;
6706 uint64_t enum_id = -1ULL;
6707
6708 rcu_read_lock();
6709
6710 /* Lookup application. If not found, there is a code flow error. */
6711 app = find_app_by_notify_sock(sock);
6712 if (!app) {
6713 /* Return an error since this is not an error */
6714 DBG("Application socket %d is being torn down. Aborting enum registration",
6715 sock);
6716 free(entries);
48c77bf7 6717 ret = -1;
10b56aef
MD
6718 goto error_rcu_unlock;
6719 }
6720
6721 /* Lookup session by UST object descriptor. */
6722 ua_sess = find_session_by_objd(app, sobjd);
6723 if (!ua_sess) {
6724 /* Return an error since this is not an error */
acfb63a8 6725 DBG("Application session is being torn down (session not found). Aborting enum registration.");
10b56aef
MD
6726 free(entries);
6727 goto error_rcu_unlock;
6728 }
6729
6730 registry = get_session_registry(ua_sess);
fad1ed2f 6731 if (!registry) {
acfb63a8 6732 DBG("Application session is being torn down (registry not found). Aborting enum registration.");
fad1ed2f
JR
6733 free(entries);
6734 goto error_rcu_unlock;
6735 }
10b56aef
MD
6736
6737 pthread_mutex_lock(&registry->lock);
6738
6739 /*
6740 * From this point on, the callee acquires the ownership of
6741 * entries. The variable entries MUST NOT be read/written after
6742 * call.
6743 */
6744 ret_code = ust_registry_create_or_find_enum(registry, sobjd, name,
6745 entries, nr_entries, &enum_id);
6746 entries = NULL;
6747
6748 /*
6749 * The return value is returned to ustctl so in case of an error, the
6750 * application can be notified. In case of an error, it's important not to
6751 * return a negative error or else the application will get closed.
6752 */
b623cb6a 6753 ret = lttng_ust_ctl_reply_register_enum(sock, enum_id, ret_code);
10b56aef 6754 if (ret < 0) {
be355079
JR
6755 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
6756 DBG3("UST app reply enum failed. Application died: pid = %d, sock = %d",
6757 app->pid, app->sock);
6758 } else if (ret == -EAGAIN) {
6759 WARN("UST app reply enum failed. Communication time out: pid = %d, sock = %d",
6760 app->pid, app->sock);
10b56aef 6761 } else {
be355079
JR
6762 ERR("UST app reply enum failed with ret %d: pid = %d, sock = %d",
6763 ret, app->pid, app->sock);
10b56aef
MD
6764 }
6765 /*
6766 * No need to wipe the create enum since the application socket will
6767 * get close on error hence cleaning up everything by itself.
6768 */
6769 goto error;
6770 }
6771
6772 DBG3("UST registry enum %s added successfully or already found", name);
6773
6774error:
6775 pthread_mutex_unlock(&registry->lock);
6776error_rcu_unlock:
6777 rcu_read_unlock();
6778 return ret;
6779}
6780
d88aee68
DG
6781/*
6782 * Handle application notification through the given notify socket.
6783 *
6784 * Return 0 on success or else a negative value.
6785 */
d0b96690
DG
6786int ust_app_recv_notify(int sock)
6787{
6788 int ret;
b623cb6a 6789 enum lttng_ust_ctl_notify_cmd cmd;
d0b96690
DG
6790
6791 DBG3("UST app receiving notify from sock %d", sock);
6792
b623cb6a 6793 ret = lttng_ust_ctl_recv_notify(sock, &cmd);
d0b96690 6794 if (ret < 0) {
be355079
JR
6795 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
6796 DBG3("UST app recv notify failed. Application died: sock = %d",
6797 sock);
6798 } else if (ret == -EAGAIN) {
6799 WARN("UST app recv notify failed. Communication time out: sock = %d",
6800 sock);
d0b96690 6801 } else {
be355079
JR
6802 ERR("UST app recv notify failed with ret %d: sock = %d",
6803 ret, sock);
d0b96690
DG
6804 }
6805 goto error;
6806 }
6807
6808 switch (cmd) {
b623cb6a 6809 case LTTNG_UST_CTL_NOTIFY_CMD_EVENT:
d0b96690 6810 {
2106efa0 6811 int sobjd, cobjd, loglevel_value;
fc4b93fa 6812 char name[LTTNG_UST_ABI_SYM_NAME_LEN], *sig, *model_emf_uri;
d0b96690 6813 size_t nr_fields;
b623cb6a 6814 struct lttng_ust_ctl_field *fields;
d0b96690
DG
6815
6816 DBG2("UST app ustctl register event received");
6817
b623cb6a 6818 ret = lttng_ust_ctl_recv_register_event(sock, &sobjd, &cobjd, name,
2106efa0
PP
6819 &loglevel_value, &sig, &nr_fields, &fields,
6820 &model_emf_uri);
d0b96690 6821 if (ret < 0) {
be355079
JR
6822 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
6823 DBG3("UST app recv event failed. Application died: sock = %d",
6824 sock);
6825 } else if (ret == -EAGAIN) {
6826 WARN("UST app recv event failed. Communication time out: sock = %d",
6827 sock);
d0b96690 6828 } else {
be355079
JR
6829 ERR("UST app recv event failed with ret %d: sock = %d",
6830 ret, sock);
d0b96690
DG
6831 }
6832 goto error;
6833 }
6834
d5d629b5
DG
6835 /*
6836 * Add event to the UST registry coming from the notify socket. This
6837 * call will free if needed the sig, fields and model_emf_uri. This
6838 * code path loses the ownsership of these variables and transfer them
6839 * to the this function.
6840 */
d0b96690 6841 ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields,
2106efa0 6842 fields, loglevel_value, model_emf_uri);
d0b96690
DG
6843 if (ret < 0) {
6844 goto error;
6845 }
6846
6847 break;
6848 }
b623cb6a 6849 case LTTNG_UST_CTL_NOTIFY_CMD_CHANNEL:
d0b96690
DG
6850 {
6851 int sobjd, cobjd;
6852 size_t nr_fields;
b623cb6a 6853 struct lttng_ust_ctl_field *fields;
d0b96690
DG
6854
6855 DBG2("UST app ustctl register channel received");
6856
b623cb6a 6857 ret = lttng_ust_ctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields,
d0b96690
DG
6858 &fields);
6859 if (ret < 0) {
be355079
JR
6860 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
6861 DBG3("UST app recv channel failed. Application died: sock = %d",
6862 sock);
6863 } else if (ret == -EAGAIN) {
6864 WARN("UST app recv channel failed. Communication time out: sock = %d",
6865 sock);
d0b96690 6866 } else {
9324443a 6867 ERR("UST app recv channel failed with ret %d: sock = %d",
be355079 6868 ret, sock);
d0b96690
DG
6869 }
6870 goto error;
6871 }
6872
d5d629b5
DG
6873 /*
6874 * The fields ownership are transfered to this function call meaning
6875 * that if needed it will be freed. After this, it's invalid to access
6876 * fields or clean it up.
6877 */
8eede835 6878 ret = reply_ust_register_channel(sock, cobjd, nr_fields,
d0b96690
DG
6879 fields);
6880 if (ret < 0) {
6881 goto error;
6882 }
6883
6884 break;
6885 }
b623cb6a 6886 case LTTNG_UST_CTL_NOTIFY_CMD_ENUM:
10b56aef
MD
6887 {
6888 int sobjd;
fc4b93fa 6889 char name[LTTNG_UST_ABI_SYM_NAME_LEN];
10b56aef 6890 size_t nr_entries;
b623cb6a 6891 struct lttng_ust_ctl_enum_entry *entries;
10b56aef
MD
6892
6893 DBG2("UST app ustctl register enum received");
6894
b623cb6a 6895 ret = lttng_ust_ctl_recv_register_enum(sock, &sobjd, name,
10b56aef
MD
6896 &entries, &nr_entries);
6897 if (ret < 0) {
be355079
JR
6898 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
6899 DBG3("UST app recv enum failed. Application died: sock = %d",
6900 sock);
6901 } else if (ret == -EAGAIN) {
6902 WARN("UST app recv enum failed. Communication time out: sock = %d",
6903 sock);
10b56aef 6904 } else {
be355079
JR
6905 ERR("UST app recv enum failed with ret %d: sock = %d",
6906 ret, sock);
10b56aef
MD
6907 }
6908 goto error;
6909 }
6910
6911 /* Callee assumes ownership of entries */
6912 ret = add_enum_ust_registry(sock, sobjd, name,
6913 entries, nr_entries);
6914 if (ret < 0) {
6915 goto error;
6916 }
6917
6918 break;
6919 }
d0b96690
DG
6920 default:
6921 /* Should NEVER happen. */
a0377dfe 6922 abort();
d0b96690
DG
6923 }
6924
6925error:
6926 return ret;
6927}
d88aee68
DG
6928
6929/*
6930 * Once the notify socket hangs up, this is called. First, it tries to find the
6931 * corresponding application. On failure, the call_rcu to close the socket is
6932 * executed. If an application is found, it tries to delete it from the notify
6933 * socket hash table. Whathever the result, it proceeds to the call_rcu.
6934 *
6935 * Note that an object needs to be allocated here so on ENOMEM failure, the
6936 * call RCU is not done but the rest of the cleanup is.
6937 */
6938void ust_app_notify_sock_unregister(int sock)
6939{
6940 int err_enomem = 0;
6941 struct lttng_ht_iter iter;
6942 struct ust_app *app;
6943 struct ust_app_notify_sock_obj *obj;
6944
a0377dfe 6945 LTTNG_ASSERT(sock >= 0);
d88aee68
DG
6946
6947 rcu_read_lock();
6948
64803277 6949 obj = zmalloc<ust_app_notify_sock_obj>();
d88aee68
DG
6950 if (!obj) {
6951 /*
6952 * An ENOMEM is kind of uncool. If this strikes we continue the
6953 * procedure but the call_rcu will not be called. In this case, we
6954 * accept the fd leak rather than possibly creating an unsynchronized
6955 * state between threads.
6956 *
6957 * TODO: The notify object should be created once the notify socket is
6958 * registered and stored independantely from the ust app object. The
6959 * tricky part is to synchronize the teardown of the application and
6960 * this notify object. Let's keep that in mind so we can avoid this
6961 * kind of shenanigans with ENOMEM in the teardown path.
6962 */
6963 err_enomem = 1;
6964 } else {
6965 obj->fd = sock;
6966 }
6967
6968 DBG("UST app notify socket unregister %d", sock);
6969
6970 /*
6971 * Lookup application by notify socket. If this fails, this means that the
6972 * hash table delete has already been done by the application
6973 * unregistration process so we can safely close the notify socket in a
6974 * call RCU.
6975 */
6976 app = find_app_by_notify_sock(sock);
6977 if (!app) {
6978 goto close_socket;
6979 }
6980
6981 iter.iter.node = &app->notify_sock_n.node;
6982
6983 /*
6984 * Whatever happens here either we fail or succeed, in both cases we have
6985 * to close the socket after a grace period to continue to the call RCU
6986 * here. If the deletion is successful, the application is not visible
6987 * anymore by other threads and is it fails it means that it was already
6988 * deleted from the hash table so either way we just have to close the
6989 * socket.
6990 */
6991 (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
6992
6993close_socket:
6994 rcu_read_unlock();
6995
6996 /*
6997 * Close socket after a grace period to avoid for the socket to be reused
6998 * before the application object is freed creating potential race between
6999 * threads trying to add unique in the global hash table.
7000 */
7001 if (!err_enomem) {
7002 call_rcu(&obj->head, close_notify_sock_rcu);
7003 }
7004}
f45e313d
DG
7005
7006/*
7007 * Destroy a ust app data structure and free its memory.
7008 */
7009void ust_app_destroy(struct ust_app *app)
7010{
7011 if (!app) {
7012 return;
7013 }
7014
7015 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
7016}
6dc3064a
DG
7017
7018/*
7019 * Take a snapshot for a given UST session. The snapshot is sent to the given
7020 * output.
7021 *
9a654598 7022 * Returns LTTNG_OK on success or a LTTNG_ERR error code.
6dc3064a 7023 */
fb9a95c4
JG
7024enum lttng_error_code ust_app_snapshot_record(
7025 const struct ltt_ust_session *usess,
f46376a1 7026 const struct consumer_output *output,
d07ceecd 7027 uint64_t nb_packets_per_stream)
6dc3064a
DG
7028{
7029 int ret = 0;
9a654598 7030 enum lttng_error_code status = LTTNG_OK;
6dc3064a
DG
7031 struct lttng_ht_iter iter;
7032 struct ust_app *app;
affce97e 7033 char *trace_path = NULL;
6dc3064a 7034
a0377dfe
FD
7035 LTTNG_ASSERT(usess);
7036 LTTNG_ASSERT(output);
6dc3064a
DG
7037
7038 rcu_read_lock();
7039
8c924c7b
MD
7040 switch (usess->buffer_type) {
7041 case LTTNG_BUFFER_PER_UID:
7042 {
7043 struct buffer_reg_uid *reg;
6dc3064a 7044
8c924c7b 7045 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
3273699d 7046 struct buffer_reg_channel *buf_reg_chan;
8c924c7b 7047 struct consumer_socket *socket;
3b967712 7048 char pathname[PATH_MAX];
5da88b0f 7049 size_t consumer_path_offset = 0;
6dc3064a 7050
2b269489
JR
7051 if (!reg->registry->reg.ust->metadata_key) {
7052 /* Skip since no metadata is present */
7053 continue;
7054 }
7055
8c924c7b
MD
7056 /* Get consumer socket to use to push the metadata.*/
7057 socket = consumer_find_socket_by_bitness(reg->bits_per_long,
7058 usess->consumer);
7059 if (!socket) {
9a654598 7060 status = LTTNG_ERR_INVALID;
8c924c7b
MD
7061 goto error;
7062 }
6dc3064a 7063
8c924c7b
MD
7064 memset(pathname, 0, sizeof(pathname));
7065 ret = snprintf(pathname, sizeof(pathname),
bd666153 7066 DEFAULT_UST_TRACE_UID_PATH,
8c924c7b
MD
7067 reg->uid, reg->bits_per_long);
7068 if (ret < 0) {
7069 PERROR("snprintf snapshot path");
9a654598 7070 status = LTTNG_ERR_INVALID;
8c924c7b
MD
7071 goto error;
7072 }
affce97e
JG
7073 /* Free path allowed on previous iteration. */
7074 free(trace_path);
5da88b0f
MD
7075 trace_path = setup_channel_trace_path(usess->consumer, pathname,
7076 &consumer_path_offset);
3b967712
MD
7077 if (!trace_path) {
7078 status = LTTNG_ERR_INVALID;
7079 goto error;
7080 }
f3db82be 7081 /* Add the UST default trace dir to path. */
8c924c7b 7082 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
3273699d 7083 buf_reg_chan, node.node) {
9a654598 7084 status = consumer_snapshot_channel(socket,
3273699d 7085 buf_reg_chan->consumer_key,
f46376a1 7086 output, 0, &trace_path[consumer_path_offset],
d2956687 7087 nb_packets_per_stream);
9a654598 7088 if (status != LTTNG_OK) {
8c924c7b
MD
7089 goto error;
7090 }
7091 }
9a654598 7092 status = consumer_snapshot_channel(socket,
68808f4e 7093 reg->registry->reg.ust->metadata_key, output, 1,
f46376a1 7094 &trace_path[consumer_path_offset], 0);
9a654598 7095 if (status != LTTNG_OK) {
8c924c7b
MD
7096 goto error;
7097 }
af706bb7 7098 }
8c924c7b
MD
7099 break;
7100 }
7101 case LTTNG_BUFFER_PER_PID:
7102 {
7103 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
7104 struct consumer_socket *socket;
7105 struct lttng_ht_iter chan_iter;
7106 struct ust_app_channel *ua_chan;
7107 struct ust_app_session *ua_sess;
7108 struct ust_registry_session *registry;
3b967712 7109 char pathname[PATH_MAX];
5da88b0f 7110 size_t consumer_path_offset = 0;
8c924c7b
MD
7111
7112 ua_sess = lookup_session_by_app(usess, app);
7113 if (!ua_sess) {
7114 /* Session not associated with this app. */
7115 continue;
7116 }
af706bb7 7117
8c924c7b
MD
7118 /* Get the right consumer socket for the application. */
7119 socket = consumer_find_socket_by_bitness(app->bits_per_long,
348a81dc 7120 output);
8c924c7b 7121 if (!socket) {
9a654598 7122 status = LTTNG_ERR_INVALID;
5c786ded
JD
7123 goto error;
7124 }
7125
8c924c7b
MD
7126 /* Add the UST default trace dir to path. */
7127 memset(pathname, 0, sizeof(pathname));
bd666153 7128 ret = snprintf(pathname, sizeof(pathname), "%s",
8c924c7b 7129 ua_sess->path);
6dc3064a 7130 if (ret < 0) {
9a654598 7131 status = LTTNG_ERR_INVALID;
8c924c7b 7132 PERROR("snprintf snapshot path");
6dc3064a
DG
7133 goto error;
7134 }
affce97e
JG
7135 /* Free path allowed on previous iteration. */
7136 free(trace_path);
5da88b0f
MD
7137 trace_path = setup_channel_trace_path(usess->consumer, pathname,
7138 &consumer_path_offset);
3b967712
MD
7139 if (!trace_path) {
7140 status = LTTNG_ERR_INVALID;
7141 goto error;
7142 }
f3db82be 7143 cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
8c924c7b 7144 ua_chan, node.node) {
9a654598 7145 status = consumer_snapshot_channel(socket,
470cc211 7146 ua_chan->key, output, 0,
f46376a1 7147 &trace_path[consumer_path_offset],
d2956687 7148 nb_packets_per_stream);
9a654598
JG
7149 switch (status) {
7150 case LTTNG_OK:
7151 break;
7152 case LTTNG_ERR_CHAN_NOT_FOUND:
7153 continue;
7154 default:
8c924c7b
MD
7155 goto error;
7156 }
7157 }
7158
7159 registry = get_session_registry(ua_sess);
fad1ed2f 7160 if (!registry) {
9bbfb88c
MD
7161 DBG("Application session is being torn down. Skip application.");
7162 continue;
fad1ed2f 7163 }
9a654598 7164 status = consumer_snapshot_channel(socket,
470cc211 7165 registry->metadata_key, output, 1,
f46376a1 7166 &trace_path[consumer_path_offset], 0);
9a654598
JG
7167 switch (status) {
7168 case LTTNG_OK:
7169 break;
7170 case LTTNG_ERR_CHAN_NOT_FOUND:
7171 continue;
7172 default:
8c924c7b
MD
7173 goto error;
7174 }
7175 }
7176 break;
7177 }
7178 default:
a0377dfe 7179 abort();
8c924c7b 7180 break;
6dc3064a
DG
7181 }
7182
7183error:
affce97e 7184 free(trace_path);
6dc3064a 7185 rcu_read_unlock();
9a654598 7186 return status;
6dc3064a 7187}
5c786ded
JD
7188
7189/*
d07ceecd 7190 * Return the size taken by one more packet per stream.
5c786ded 7191 */
fb9a95c4
JG
7192uint64_t ust_app_get_size_one_more_packet_per_stream(
7193 const struct ltt_ust_session *usess, uint64_t cur_nr_packets)
5c786ded 7194{
d07ceecd 7195 uint64_t tot_size = 0;
5c786ded
JD
7196 struct ust_app *app;
7197 struct lttng_ht_iter iter;
7198
a0377dfe 7199 LTTNG_ASSERT(usess);
5c786ded
JD
7200
7201 switch (usess->buffer_type) {
7202 case LTTNG_BUFFER_PER_UID:
7203 {
7204 struct buffer_reg_uid *reg;
7205
7206 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
3273699d 7207 struct buffer_reg_channel *buf_reg_chan;
5c786ded 7208
b7064eaa 7209 rcu_read_lock();
5c786ded 7210 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
3273699d
FD
7211 buf_reg_chan, node.node) {
7212 if (cur_nr_packets >= buf_reg_chan->num_subbuf) {
d07ceecd
MD
7213 /*
7214 * Don't take channel into account if we
7215 * already grab all its packets.
7216 */
7217 continue;
7218 }
3273699d 7219 tot_size += buf_reg_chan->subbuf_size * buf_reg_chan->stream_count;
5c786ded 7220 }
b7064eaa 7221 rcu_read_unlock();
5c786ded
JD
7222 }
7223 break;
7224 }
7225 case LTTNG_BUFFER_PER_PID:
7226 {
7227 rcu_read_lock();
7228 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
7229 struct ust_app_channel *ua_chan;
7230 struct ust_app_session *ua_sess;
7231 struct lttng_ht_iter chan_iter;
7232
7233 ua_sess = lookup_session_by_app(usess, app);
7234 if (!ua_sess) {
7235 /* Session not associated with this app. */
7236 continue;
7237 }
7238
7239 cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
7240 ua_chan, node.node) {
d07ceecd
MD
7241 if (cur_nr_packets >= ua_chan->attr.num_subbuf) {
7242 /*
7243 * Don't take channel into account if we
7244 * already grab all its packets.
7245 */
7246 continue;
7247 }
7248 tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count;
5c786ded
JD
7249 }
7250 }
7251 rcu_read_unlock();
7252 break;
7253 }
7254 default:
a0377dfe 7255 abort();
5c786ded
JD
7256 break;
7257 }
7258
d07ceecd 7259 return tot_size;
5c786ded 7260}
fb83fe64
JD
7261
7262int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id,
7263 struct cds_list_head *buffer_reg_uid_list,
7264 struct consumer_output *consumer, uint64_t uchan_id,
7265 int overwrite, uint64_t *discarded, uint64_t *lost)
7266{
7267 int ret;
7268 uint64_t consumer_chan_key;
7269
70dd8162
MD
7270 *discarded = 0;
7271 *lost = 0;
7272
fb83fe64 7273 ret = buffer_reg_uid_consumer_channel_key(
76604852 7274 buffer_reg_uid_list, uchan_id, &consumer_chan_key);
fb83fe64 7275 if (ret < 0) {
70dd8162
MD
7276 /* Not found */
7277 ret = 0;
fb83fe64
JD
7278 goto end;
7279 }
7280
7281 if (overwrite) {
7282 ret = consumer_get_lost_packets(ust_session_id,
7283 consumer_chan_key, consumer, lost);
7284 } else {
7285 ret = consumer_get_discarded_events(ust_session_id,
7286 consumer_chan_key, consumer, discarded);
7287 }
7288
7289end:
7290 return ret;
7291}
7292
7293int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess,
7294 struct ltt_ust_channel *uchan,
7295 struct consumer_output *consumer, int overwrite,
7296 uint64_t *discarded, uint64_t *lost)
7297{
7298 int ret = 0;
7299 struct lttng_ht_iter iter;
7300 struct lttng_ht_node_str *ua_chan_node;
7301 struct ust_app *app;
7302 struct ust_app_session *ua_sess;
7303 struct ust_app_channel *ua_chan;
7304
70dd8162
MD
7305 *discarded = 0;
7306 *lost = 0;
7307
fb83fe64
JD
7308 rcu_read_lock();
7309 /*
70dd8162
MD
7310 * Iterate over every registered applications. Sum counters for
7311 * all applications containing requested session and channel.
fb83fe64
JD
7312 */
7313 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
7314 struct lttng_ht_iter uiter;
7315
7316 ua_sess = lookup_session_by_app(usess, app);
7317 if (ua_sess == NULL) {
7318 continue;
7319 }
7320
7321 /* Get channel */
ee022399 7322 lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter);
fb83fe64
JD
7323 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
7324 /* If the session is found for the app, the channel must be there */
a0377dfe 7325 LTTNG_ASSERT(ua_chan_node);
fb83fe64
JD
7326
7327 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
7328
7329 if (overwrite) {
70dd8162
MD
7330 uint64_t _lost;
7331
fb83fe64 7332 ret = consumer_get_lost_packets(usess->id, ua_chan->key,
70dd8162
MD
7333 consumer, &_lost);
7334 if (ret < 0) {
7335 break;
7336 }
7337 (*lost) += _lost;
fb83fe64 7338 } else {
70dd8162
MD
7339 uint64_t _discarded;
7340
fb83fe64 7341 ret = consumer_get_discarded_events(usess->id,
70dd8162
MD
7342 ua_chan->key, consumer, &_discarded);
7343 if (ret < 0) {
7344 break;
7345 }
7346 (*discarded) += _discarded;
fb83fe64 7347 }
fb83fe64
JD
7348 }
7349
fb83fe64
JD
7350 rcu_read_unlock();
7351 return ret;
7352}
c2561365
JD
7353
7354static
7355int ust_app_regenerate_statedump(struct ltt_ust_session *usess,
7356 struct ust_app *app)
7357{
7358 int ret = 0;
7359 struct ust_app_session *ua_sess;
7360
7361 DBG("Regenerating the metadata for ust app pid %d", app->pid);
7362
7363 rcu_read_lock();
7364
7365 ua_sess = lookup_session_by_app(usess, app);
7366 if (ua_sess == NULL) {
7367 /* The session is in teardown process. Ignore and continue. */
7368 goto end;
7369 }
7370
7371 pthread_mutex_lock(&ua_sess->lock);
7372
7373 if (ua_sess->deleted) {
7374 goto end_unlock;
7375 }
7376
7377 pthread_mutex_lock(&app->sock_lock);
b623cb6a 7378 ret = lttng_ust_ctl_regenerate_statedump(app->sock, ua_sess->handle);
c2561365
JD
7379 pthread_mutex_unlock(&app->sock_lock);
7380
7381end_unlock:
7382 pthread_mutex_unlock(&ua_sess->lock);
7383
7384end:
7385 rcu_read_unlock();
7386 health_code_update();
7387 return ret;
7388}
7389
7390/*
7391 * Regenerate the statedump for each app in the session.
7392 */
7393int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess)
7394{
7395 int ret = 0;
7396 struct lttng_ht_iter iter;
7397 struct ust_app *app;
7398
7399 DBG("Regenerating the metadata for all UST apps");
7400
7401 rcu_read_lock();
7402
7403 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
7404 if (!app->compatible) {
7405 continue;
7406 }
7407
7408 ret = ust_app_regenerate_statedump(usess, app);
7409 if (ret < 0) {
7410 /* Continue to the next app even on error */
7411 continue;
7412 }
7413 }
7414
7415 rcu_read_unlock();
7416
7417 return 0;
7418}
5c408ad8
JD
7419
7420/*
7421 * Rotate all the channels of a session.
7422 *
6f6d3b69 7423 * Return LTTNG_OK on success or else an LTTng error code.
5c408ad8 7424 */
6f6d3b69 7425enum lttng_error_code ust_app_rotate_session(struct ltt_session *session)
5c408ad8 7426{
6f6d3b69
MD
7427 int ret;
7428 enum lttng_error_code cmd_ret = LTTNG_OK;
5c408ad8
JD
7429 struct lttng_ht_iter iter;
7430 struct ust_app *app;
7431 struct ltt_ust_session *usess = session->ust_session;
5c408ad8 7432
a0377dfe 7433 LTTNG_ASSERT(usess);
5c408ad8
JD
7434
7435 rcu_read_lock();
7436
7437 switch (usess->buffer_type) {
7438 case LTTNG_BUFFER_PER_UID:
7439 {
7440 struct buffer_reg_uid *reg;
7441
7442 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
3273699d 7443 struct buffer_reg_channel *buf_reg_chan;
5c408ad8
JD
7444 struct consumer_socket *socket;
7445
7446 /* Get consumer socket to use to push the metadata.*/
7447 socket = consumer_find_socket_by_bitness(reg->bits_per_long,
7448 usess->consumer);
7449 if (!socket) {
6f6d3b69 7450 cmd_ret = LTTNG_ERR_INVALID;
5c408ad8
JD
7451 goto error;
7452 }
7453
5c408ad8
JD
7454 /* Rotate the data channels. */
7455 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
3273699d 7456 buf_reg_chan, node.node) {
5c408ad8 7457 ret = consumer_rotate_channel(socket,
3273699d 7458 buf_reg_chan->consumer_key,
d2956687
JG
7459 usess->consumer,
7460 /* is_metadata_channel */ false);
5c408ad8 7461 if (ret < 0) {
6f6d3b69 7462 cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER;
5c408ad8
JD
7463 goto error;
7464 }
7465 }
7466
db786d44
JR
7467 /*
7468 * The metadata channel might not be present.
7469 *
7470 * Consumer stream allocation can be done
7471 * asynchronously and can fail on intermediary
7472 * operations (i.e add context) and lead to data
7473 * channels created with no metadata channel.
7474 */
7475 if (!reg->registry->reg.ust->metadata_key) {
7476 /* Skip since no metadata is present. */
7477 continue;
7478 }
7479
5c408ad8
JD
7480 (void) push_metadata(reg->registry->reg.ust, usess->consumer);
7481
7482 ret = consumer_rotate_channel(socket,
7483 reg->registry->reg.ust->metadata_key,
d2956687
JG
7484 usess->consumer,
7485 /* is_metadata_channel */ true);
5c408ad8 7486 if (ret < 0) {
6f6d3b69 7487 cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER;
5c408ad8
JD
7488 goto error;
7489 }
5c408ad8
JD
7490 }
7491 break;
7492 }
7493 case LTTNG_BUFFER_PER_PID:
7494 {
7495 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
7496 struct consumer_socket *socket;
7497 struct lttng_ht_iter chan_iter;
7498 struct ust_app_channel *ua_chan;
7499 struct ust_app_session *ua_sess;
7500 struct ust_registry_session *registry;
7501
7502 ua_sess = lookup_session_by_app(usess, app);
7503 if (!ua_sess) {
7504 /* Session not associated with this app. */
7505 continue;
7506 }
5c408ad8
JD
7507
7508 /* Get the right consumer socket for the application. */
7509 socket = consumer_find_socket_by_bitness(app->bits_per_long,
7510 usess->consumer);
7511 if (!socket) {
6f6d3b69 7512 cmd_ret = LTTNG_ERR_INVALID;
5c408ad8
JD
7513 goto error;
7514 }
7515
7516 registry = get_session_registry(ua_sess);
7517 if (!registry) {
6f6d3b69
MD
7518 DBG("Application session is being torn down. Skip application.");
7519 continue;
5c408ad8
JD
7520 }
7521
5c408ad8
JD
7522 /* Rotate the data channels. */
7523 cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
7524 ua_chan, node.node) {
470cc211
JG
7525 ret = consumer_rotate_channel(socket,
7526 ua_chan->key,
d2956687
JG
7527 ua_sess->consumer,
7528 /* is_metadata_channel */ false);
5c408ad8 7529 if (ret < 0) {
6f6d3b69
MD
7530 /* Per-PID buffer and application going away. */
7531 if (ret == -LTTNG_ERR_CHAN_NOT_FOUND)
7532 continue;
7533 cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER;
5c408ad8
JD
7534 goto error;
7535 }
7536 }
7537
7538 /* Rotate the metadata channel. */
7539 (void) push_metadata(registry, usess->consumer);
470cc211
JG
7540 ret = consumer_rotate_channel(socket,
7541 registry->metadata_key,
d2956687
JG
7542 ua_sess->consumer,
7543 /* is_metadata_channel */ true);
5c408ad8 7544 if (ret < 0) {
6f6d3b69
MD
7545 /* Per-PID buffer and application going away. */
7546 if (ret == -LTTNG_ERR_CHAN_NOT_FOUND)
7547 continue;
7548 cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER;
5c408ad8
JD
7549 goto error;
7550 }
5c408ad8
JD
7551 }
7552 break;
7553 }
7554 default:
a0377dfe 7555 abort();
5c408ad8
JD
7556 break;
7557 }
7558
6f6d3b69 7559 cmd_ret = LTTNG_OK;
5c408ad8
JD
7560
7561error:
7562 rcu_read_unlock();
6f6d3b69 7563 return cmd_ret;
5c408ad8 7564}
d2956687
JG
7565
7566enum lttng_error_code ust_app_create_channel_subdirectories(
7567 const struct ltt_ust_session *usess)
7568{
7569 enum lttng_error_code ret = LTTNG_OK;
7570 struct lttng_ht_iter iter;
7571 enum lttng_trace_chunk_status chunk_status;
7572 char *pathname_index;
7573 int fmt_ret;
7574
a0377dfe 7575 LTTNG_ASSERT(usess->current_trace_chunk);
d2956687
JG
7576 rcu_read_lock();
7577
7578 switch (usess->buffer_type) {
7579 case LTTNG_BUFFER_PER_UID:
7580 {
7581 struct buffer_reg_uid *reg;
7582
7583 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
7584 fmt_ret = asprintf(&pathname_index,
5da88b0f 7585 DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH "/" DEFAULT_INDEX_DIR,
d2956687
JG
7586 reg->uid, reg->bits_per_long);
7587 if (fmt_ret < 0) {
7588 ERR("Failed to format channel index directory");
7589 ret = LTTNG_ERR_CREATE_DIR_FAIL;
7590 goto error;
7591 }
7592
7593 /*
7594 * Create the index subdirectory which will take care
7595 * of implicitly creating the channel's path.
7596 */
7597 chunk_status = lttng_trace_chunk_create_subdirectory(
7598 usess->current_trace_chunk,
7599 pathname_index);
7600 free(pathname_index);
7601 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
7602 ret = LTTNG_ERR_CREATE_DIR_FAIL;
7603 goto error;
7604 }
7605 }
7606 break;
7607 }
7608 case LTTNG_BUFFER_PER_PID:
7609 {
7610 struct ust_app *app;
7611
495dece5
MD
7612 /*
7613 * Create the toplevel ust/ directory in case no apps are running.
7614 */
7615 chunk_status = lttng_trace_chunk_create_subdirectory(
7616 usess->current_trace_chunk,
7617 DEFAULT_UST_TRACE_DIR);
7618 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
7619 ret = LTTNG_ERR_CREATE_DIR_FAIL;
7620 goto error;
7621 }
7622
d2956687
JG
7623 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app,
7624 pid_n.node) {
7625 struct ust_app_session *ua_sess;
7626 struct ust_registry_session *registry;
7627
7628 ua_sess = lookup_session_by_app(usess, app);
7629 if (!ua_sess) {
7630 /* Session not associated with this app. */
7631 continue;
7632 }
7633
7634 registry = get_session_registry(ua_sess);
7635 if (!registry) {
7636 DBG("Application session is being torn down. Skip application.");
7637 continue;
7638 }
7639
7640 fmt_ret = asprintf(&pathname_index,
5da88b0f 7641 DEFAULT_UST_TRACE_DIR "/%s/" DEFAULT_INDEX_DIR,
d2956687
JG
7642 ua_sess->path);
7643 if (fmt_ret < 0) {
7644 ERR("Failed to format channel index directory");
7645 ret = LTTNG_ERR_CREATE_DIR_FAIL;
7646 goto error;
7647 }
7648 /*
7649 * Create the index subdirectory which will take care
7650 * of implicitly creating the channel's path.
7651 */
7652 chunk_status = lttng_trace_chunk_create_subdirectory(
7653 usess->current_trace_chunk,
7654 pathname_index);
7655 free(pathname_index);
7656 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
7657 ret = LTTNG_ERR_CREATE_DIR_FAIL;
7658 goto error;
7659 }
7660 }
7661 break;
7662 }
7663 default:
7664 abort();
7665 }
7666
7667 ret = LTTNG_OK;
7668error:
7669 rcu_read_unlock();
7670 return ret;
7671}
4a9b9759
MD
7672
7673/*
7674 * Clear all the channels of a session.
7675 *
7676 * Return LTTNG_OK on success or else an LTTng error code.
7677 */
7678enum lttng_error_code ust_app_clear_session(struct ltt_session *session)
7679{
7680 int ret;
7681 enum lttng_error_code cmd_ret = LTTNG_OK;
7682 struct lttng_ht_iter iter;
7683 struct ust_app *app;
7684 struct ltt_ust_session *usess = session->ust_session;
7685
a0377dfe 7686 LTTNG_ASSERT(usess);
4a9b9759
MD
7687
7688 rcu_read_lock();
7689
7690 if (usess->active) {
7691 ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id);
7692 cmd_ret = LTTNG_ERR_FATAL;
7693 goto end;
7694 }
7695
7696 switch (usess->buffer_type) {
7697 case LTTNG_BUFFER_PER_UID:
7698 {
7699 struct buffer_reg_uid *reg;
7700
7701 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
3273699d 7702 struct buffer_reg_channel *buf_reg_chan;
4a9b9759
MD
7703 struct consumer_socket *socket;
7704
7705 /* Get consumer socket to use to push the metadata.*/
7706 socket = consumer_find_socket_by_bitness(reg->bits_per_long,
7707 usess->consumer);
7708 if (!socket) {
7709 cmd_ret = LTTNG_ERR_INVALID;
7710 goto error_socket;
7711 }
7712
7713 /* Clear the data channels. */
7714 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
3273699d 7715 buf_reg_chan, node.node) {
4a9b9759 7716 ret = consumer_clear_channel(socket,
3273699d 7717 buf_reg_chan->consumer_key);
4a9b9759
MD
7718 if (ret < 0) {
7719 goto error;
7720 }
7721 }
7722
7723 (void) push_metadata(reg->registry->reg.ust, usess->consumer);
7724
7725 /*
7726 * Clear the metadata channel.
7727 * Metadata channel is not cleared per se but we still need to
7728 * perform a rotation operation on it behind the scene.
7729 */
7730 ret = consumer_clear_channel(socket,
7731 reg->registry->reg.ust->metadata_key);
7732 if (ret < 0) {
7733 goto error;
7734 }
7735 }
7736 break;
7737 }
7738 case LTTNG_BUFFER_PER_PID:
7739 {
7740 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
7741 struct consumer_socket *socket;
7742 struct lttng_ht_iter chan_iter;
7743 struct ust_app_channel *ua_chan;
7744 struct ust_app_session *ua_sess;
7745 struct ust_registry_session *registry;
7746
7747 ua_sess = lookup_session_by_app(usess, app);
7748 if (!ua_sess) {
7749 /* Session not associated with this app. */
7750 continue;
7751 }
7752
7753 /* Get the right consumer socket for the application. */
7754 socket = consumer_find_socket_by_bitness(app->bits_per_long,
7755 usess->consumer);
7756 if (!socket) {
7757 cmd_ret = LTTNG_ERR_INVALID;
7758 goto error_socket;
7759 }
7760
7761 registry = get_session_registry(ua_sess);
7762 if (!registry) {
7763 DBG("Application session is being torn down. Skip application.");
7764 continue;
7765 }
7766
7767 /* Clear the data channels. */
7768 cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
7769 ua_chan, node.node) {
7770 ret = consumer_clear_channel(socket, ua_chan->key);
7771 if (ret < 0) {
7772 /* Per-PID buffer and application going away. */
7773 if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) {
7774 continue;
7775 }
7776 goto error;
7777 }
7778 }
7779
7780 (void) push_metadata(registry, usess->consumer);
7781
7782 /*
7783 * Clear the metadata channel.
7784 * Metadata channel is not cleared per se but we still need to
7785 * perform rotation operation on it behind the scene.
7786 */
7787 ret = consumer_clear_channel(socket, registry->metadata_key);
7788 if (ret < 0) {
7789 /* Per-PID buffer and application going away. */
7790 if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) {
7791 continue;
7792 }
7793 goto error;
7794 }
7795 }
7796 break;
7797 }
7798 default:
a0377dfe 7799 abort();
4a9b9759
MD
7800 break;
7801 }
7802
7803 cmd_ret = LTTNG_OK;
7804 goto end;
7805
7806error:
7807 switch (-ret) {
7808 case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED:
7809 cmd_ret = LTTNG_ERR_CLEAR_RELAY_DISALLOWED;
7810 break;
7811 default:
7812 cmd_ret = LTTNG_ERR_CLEAR_FAIL_CONSUMER;
7813 }
7814
7815error_socket:
7816end:
7817 rcu_read_unlock();
7818 return cmd_ret;
7819}
04ed9e10
JG
7820
7821/*
7822 * This function skips the metadata channel as the begin/end timestamps of a
7823 * metadata packet are useless.
7824 *
7825 * Moreover, opening a packet after a "clear" will cause problems for live
7826 * sessions as it will introduce padding that was not part of the first trace
7827 * chunk. The relay daemon expects the content of the metadata stream of
7828 * successive metadata trace chunks to be strict supersets of one another.
7829 *
7830 * For example, flushing a packet at the beginning of the metadata stream of
7831 * a trace chunk resulting from a "clear" session command will cause the
7832 * size of the metadata stream of the new trace chunk to not match the size of
7833 * the metadata stream of the original chunk. This will confuse the relay
7834 * daemon as the same "offset" in a metadata stream will no longer point
7835 * to the same content.
7836 */
7837enum lttng_error_code ust_app_open_packets(struct ltt_session *session)
7838{
7839 enum lttng_error_code ret = LTTNG_OK;
7840 struct lttng_ht_iter iter;
7841 struct ltt_ust_session *usess = session->ust_session;
7842
a0377dfe 7843 LTTNG_ASSERT(usess);
04ed9e10
JG
7844
7845 rcu_read_lock();
7846
7847 switch (usess->buffer_type) {
7848 case LTTNG_BUFFER_PER_UID:
7849 {
7850 struct buffer_reg_uid *reg;
7851
7852 cds_list_for_each_entry (
7853 reg, &usess->buffer_reg_uid_list, lnode) {
3273699d 7854 struct buffer_reg_channel *buf_reg_chan;
04ed9e10
JG
7855 struct consumer_socket *socket;
7856
7857 socket = consumer_find_socket_by_bitness(
7858 reg->bits_per_long, usess->consumer);
7859 if (!socket) {
7860 ret = LTTNG_ERR_FATAL;
7861 goto error;
7862 }
7863
7864 cds_lfht_for_each_entry(reg->registry->channels->ht,
3273699d 7865 &iter.iter, buf_reg_chan, node.node) {
04ed9e10
JG
7866 const int open_ret =
7867 consumer_open_channel_packets(
7868 socket,
3273699d 7869 buf_reg_chan->consumer_key);
04ed9e10
JG
7870
7871 if (open_ret < 0) {
7872 ret = LTTNG_ERR_UNK;
7873 goto error;
7874 }
7875 }
7876 }
7877 break;
7878 }
7879 case LTTNG_BUFFER_PER_PID:
7880 {
7881 struct ust_app *app;
7882
7883 cds_lfht_for_each_entry (
7884 ust_app_ht->ht, &iter.iter, app, pid_n.node) {
7885 struct consumer_socket *socket;
7886 struct lttng_ht_iter chan_iter;
7887 struct ust_app_channel *ua_chan;
7888 struct ust_app_session *ua_sess;
7889 struct ust_registry_session *registry;
7890
7891 ua_sess = lookup_session_by_app(usess, app);
7892 if (!ua_sess) {
7893 /* Session not associated with this app. */
7894 continue;
7895 }
7896
7897 /* Get the right consumer socket for the application. */
7898 socket = consumer_find_socket_by_bitness(
7899 app->bits_per_long, usess->consumer);
7900 if (!socket) {
7901 ret = LTTNG_ERR_FATAL;
7902 goto error;
7903 }
7904
7905 registry = get_session_registry(ua_sess);
7906 if (!registry) {
7907 DBG("Application session is being torn down. Skip application.");
7908 continue;
7909 }
7910
7911 cds_lfht_for_each_entry(ua_sess->channels->ht,
7912 &chan_iter.iter, ua_chan, node.node) {
7913 const int open_ret =
7914 consumer_open_channel_packets(
7915 socket,
7916 ua_chan->key);
7917
7918 if (open_ret < 0) {
7919 /*
7920 * Per-PID buffer and application going
7921 * away.
7922 */
97a171e1 7923 if (open_ret == -LTTNG_ERR_CHAN_NOT_FOUND) {
04ed9e10
JG
7924 continue;
7925 }
7926
7927 ret = LTTNG_ERR_UNK;
7928 goto error;
7929 }
7930 }
7931 }
7932 break;
7933 }
7934 default:
7935 abort();
7936 break;
7937 }
7938
7939error:
7940 rcu_read_unlock();
7941 return ret;
7942}
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