Fix: lttng: out-of-bound copy of arguments in 'view' command handler
[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.c
CommitLineData
91d76f53
DG
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
bdf64013 3 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
91d76f53 4 *
d14d33bf
AM
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
91d76f53
DG
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
d14d33bf
AM
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
91d76f53
DG
17 */
18
6c1c0768 19#define _LGPL_SOURCE
91d76f53 20#include <errno.h>
7972aab2 21#include <inttypes.h>
91d76f53
DG
22#include <pthread.h>
23#include <stdio.h>
24#include <stdlib.h>
099e26bd 25#include <string.h>
aba8e916
DG
26#include <sys/stat.h>
27#include <sys/types.h>
099e26bd 28#include <unistd.h>
0df502fd 29#include <urcu/compiler.h>
fb54cdbf 30#include <lttng/ust-error.h>
331744e3 31#include <signal.h>
bec39940 32
990570ed 33#include <common/common.h>
86acf0da 34#include <common/sessiond-comm/sessiond-comm.h>
1e307fab 35
7972aab2 36#include "buffer-registry.h"
86acf0da 37#include "fd-limit.h"
8782cc74 38#include "health-sessiond.h"
56fff090 39#include "ust-app.h"
48842b30 40#include "ust-consumer.h"
d80a6244 41#include "ust-ctl.h"
0b2dc8df 42#include "utils.h"
fb83fe64 43#include "session.h"
e9404c27
JG
44#include "lttng-sessiond.h"
45#include "notification-thread-commands.h"
5c408ad8 46#include "rotate.h"
d80a6244 47
c4b88406
MD
48static
49int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess);
50
d9bf3ca4
MD
51/* Next available channel key. Access under next_channel_key_lock. */
52static uint64_t _next_channel_key;
53static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER;
54
55/* Next available session ID. Access under next_session_id_lock. */
56static uint64_t _next_session_id;
57static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER;
ffe60014
DG
58
59/*
d9bf3ca4 60 * Return the incremented value of next_channel_key.
ffe60014 61 */
d9bf3ca4 62static uint64_t get_next_channel_key(void)
ffe60014 63{
d9bf3ca4
MD
64 uint64_t ret;
65
66 pthread_mutex_lock(&next_channel_key_lock);
67 ret = ++_next_channel_key;
68 pthread_mutex_unlock(&next_channel_key_lock);
69 return ret;
ffe60014
DG
70}
71
72/*
7972aab2 73 * Return the atomically incremented value of next_session_id.
ffe60014 74 */
d9bf3ca4 75static uint64_t get_next_session_id(void)
ffe60014 76{
d9bf3ca4
MD
77 uint64_t ret;
78
79 pthread_mutex_lock(&next_session_id_lock);
80 ret = ++_next_session_id;
81 pthread_mutex_unlock(&next_session_id_lock);
82 return ret;
ffe60014
DG
83}
84
d65d2de8
DG
85static void copy_channel_attr_to_ustctl(
86 struct ustctl_consumer_channel_attr *attr,
87 struct lttng_ust_channel_attr *uattr)
88{
89 /* Copy event attributes since the layout is different. */
90 attr->subbuf_size = uattr->subbuf_size;
91 attr->num_subbuf = uattr->num_subbuf;
92 attr->overwrite = uattr->overwrite;
93 attr->switch_timer_interval = uattr->switch_timer_interval;
94 attr->read_timer_interval = uattr->read_timer_interval;
95 attr->output = uattr->output;
491d1539 96 attr->blocking_timeout = uattr->u.s.blocking_timeout;
d65d2de8
DG
97}
98
025faf73
DG
99/*
100 * Match function for the hash table lookup.
101 *
102 * It matches an ust app event based on three attributes which are the event
103 * name, the filter bytecode and the loglevel.
104 */
18eace3b
DG
105static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key)
106{
107 struct ust_app_event *event;
108 const struct ust_app_ht_key *key;
2106efa0 109 int ev_loglevel_value;
18eace3b
DG
110
111 assert(node);
112 assert(_key);
113
114 event = caa_container_of(node, struct ust_app_event, node.node);
115 key = _key;
2106efa0 116 ev_loglevel_value = event->attr.loglevel;
18eace3b 117
1af53eb5 118 /* Match the 4 elements of the key: name, filter, loglevel, exclusions */
18eace3b
DG
119
120 /* Event name */
121 if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
122 goto no_match;
123 }
124
125 /* Event loglevel. */
2106efa0 126 if (ev_loglevel_value != key->loglevel_type) {
025faf73 127 if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL
2106efa0
PP
128 && key->loglevel_type == 0 &&
129 ev_loglevel_value == -1) {
025faf73
DG
130 /*
131 * Match is accepted. This is because on event creation, the
132 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
133 * -1 are accepted for this loglevel type since 0 is the one set by
134 * the API when receiving an enable event.
135 */
136 } else {
137 goto no_match;
138 }
18eace3b
DG
139 }
140
141 /* One of the filters is NULL, fail. */
142 if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
143 goto no_match;
144 }
145
025faf73
DG
146 if (key->filter && event->filter) {
147 /* Both filters exists, check length followed by the bytecode. */
148 if (event->filter->len != key->filter->len ||
149 memcmp(event->filter->data, key->filter->data,
150 event->filter->len) != 0) {
151 goto no_match;
152 }
18eace3b
DG
153 }
154
1af53eb5
JI
155 /* One of the exclusions is NULL, fail. */
156 if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) {
157 goto no_match;
158 }
159
160 if (key->exclusion && event->exclusion) {
161 /* Both exclusions exists, check count followed by the names. */
162 if (event->exclusion->count != key->exclusion->count ||
163 memcmp(event->exclusion->names, key->exclusion->names,
164 event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) {
165 goto no_match;
166 }
167 }
168
169
025faf73 170 /* Match. */
18eace3b
DG
171 return 1;
172
173no_match:
174 return 0;
18eace3b
DG
175}
176
025faf73
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177/*
178 * Unique add of an ust app event in the given ht. This uses the custom
179 * ht_match_ust_app_event match function and the event name as hash.
180 */
d0b96690 181static void add_unique_ust_app_event(struct ust_app_channel *ua_chan,
18eace3b
DG
182 struct ust_app_event *event)
183{
184 struct cds_lfht_node *node_ptr;
185 struct ust_app_ht_key key;
d0b96690 186 struct lttng_ht *ht;
18eace3b 187
d0b96690
DG
188 assert(ua_chan);
189 assert(ua_chan->events);
18eace3b
DG
190 assert(event);
191
d0b96690 192 ht = ua_chan->events;
18eace3b
DG
193 key.name = event->attr.name;
194 key.filter = event->filter;
2106efa0 195 key.loglevel_type = event->attr.loglevel;
91c89f23 196 key.exclusion = event->exclusion;
18eace3b
DG
197
198 node_ptr = cds_lfht_add_unique(ht->ht,
199 ht->hash_fct(event->node.key, lttng_ht_seed),
200 ht_match_ust_app_event, &key, &event->node.node);
201 assert(node_ptr == &event->node.node);
202}
203
d88aee68
DG
204/*
205 * Close the notify socket from the given RCU head object. This MUST be called
206 * through a call_rcu().
207 */
208static void close_notify_sock_rcu(struct rcu_head *head)
209{
210 int ret;
211 struct ust_app_notify_sock_obj *obj =
212 caa_container_of(head, struct ust_app_notify_sock_obj, head);
213
214 /* Must have a valid fd here. */
215 assert(obj->fd >= 0);
216
217 ret = close(obj->fd);
218 if (ret) {
219 ERR("close notify sock %d RCU", obj->fd);
220 }
221 lttng_fd_put(LTTNG_FD_APPS, 1);
222
223 free(obj);
224}
225
7972aab2
DG
226/*
227 * Return the session registry according to the buffer type of the given
228 * session.
229 *
230 * A registry per UID object MUST exists before calling this function or else
231 * it assert() if not found. RCU read side lock must be acquired.
232 */
233static struct ust_registry_session *get_session_registry(
234 struct ust_app_session *ua_sess)
235{
236 struct ust_registry_session *registry = NULL;
237
238 assert(ua_sess);
239
240 switch (ua_sess->buffer_type) {
241 case LTTNG_BUFFER_PER_PID:
242 {
243 struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id);
244 if (!reg_pid) {
245 goto error;
246 }
247 registry = reg_pid->registry->reg.ust;
248 break;
249 }
250 case LTTNG_BUFFER_PER_UID:
251 {
252 struct buffer_reg_uid *reg_uid = buffer_reg_uid_find(
470cc211
JG
253 ua_sess->tracing_id, ua_sess->bits_per_long,
254 ua_sess->real_credentials.uid);
7972aab2
DG
255 if (!reg_uid) {
256 goto error;
257 }
258 registry = reg_uid->registry->reg.ust;
259 break;
260 }
261 default:
262 assert(0);
263 };
264
265error:
266 return registry;
267}
268
55cc08a6
DG
269/*
270 * Delete ust context safely. RCU read lock must be held before calling
271 * this function.
272 */
273static
fb45065e
MD
274void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx,
275 struct ust_app *app)
55cc08a6 276{
ffe60014
DG
277 int ret;
278
279 assert(ua_ctx);
280
55cc08a6 281 if (ua_ctx->obj) {
fb45065e 282 pthread_mutex_lock(&app->sock_lock);
ffe60014 283 ret = ustctl_release_object(sock, ua_ctx->obj);
fb45065e 284 pthread_mutex_unlock(&app->sock_lock);
d0b96690
DG
285 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
286 ERR("UST app sock %d release ctx obj handle %d failed with ret %d",
287 sock, ua_ctx->obj->handle, ret);
ffe60014 288 }
55cc08a6
DG
289 free(ua_ctx->obj);
290 }
291 free(ua_ctx);
292}
293
d80a6244
DG
294/*
295 * Delete ust app event safely. RCU read lock must be held before calling
296 * this function.
297 */
8b366481 298static
fb45065e
MD
299void delete_ust_app_event(int sock, struct ust_app_event *ua_event,
300 struct ust_app *app)
d80a6244 301{
ffe60014
DG
302 int ret;
303
304 assert(ua_event);
305
53a80697 306 free(ua_event->filter);
951f0b71
JI
307 if (ua_event->exclusion != NULL)
308 free(ua_event->exclusion);
edb67388 309 if (ua_event->obj != NULL) {
fb45065e 310 pthread_mutex_lock(&app->sock_lock);
ffe60014 311 ret = ustctl_release_object(sock, ua_event->obj);
fb45065e 312 pthread_mutex_unlock(&app->sock_lock);
ffe60014
DG
313 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
314 ERR("UST app sock %d release event obj failed with ret %d",
315 sock, ret);
316 }
edb67388
DG
317 free(ua_event->obj);
318 }
d80a6244
DG
319 free(ua_event);
320}
321
322/*
7972aab2
DG
323 * Release ust data object of the given stream.
324 *
325 * Return 0 on success or else a negative value.
d80a6244 326 */
fb45065e
MD
327static int release_ust_app_stream(int sock, struct ust_app_stream *stream,
328 struct ust_app *app)
d80a6244 329{
7972aab2 330 int ret = 0;
ffe60014
DG
331
332 assert(stream);
333
8b366481 334 if (stream->obj) {
fb45065e 335 pthread_mutex_lock(&app->sock_lock);
ffe60014 336 ret = ustctl_release_object(sock, stream->obj);
fb45065e 337 pthread_mutex_unlock(&app->sock_lock);
ffe60014
DG
338 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
339 ERR("UST app sock %d release stream obj failed with ret %d",
340 sock, ret);
341 }
4063050c 342 lttng_fd_put(LTTNG_FD_APPS, 2);
8b366481
DG
343 free(stream->obj);
344 }
7972aab2
DG
345
346 return ret;
347}
348
349/*
350 * Delete ust app stream safely. RCU read lock must be held before calling
351 * this function.
352 */
353static
fb45065e
MD
354void delete_ust_app_stream(int sock, struct ust_app_stream *stream,
355 struct ust_app *app)
7972aab2
DG
356{
357 assert(stream);
358
fb45065e 359 (void) release_ust_app_stream(sock, stream, app);
84cd17c6 360 free(stream);
d80a6244
DG
361}
362
36b588ed
MD
363/*
364 * We need to execute ht_destroy outside of RCU read-side critical
0b2dc8df
MD
365 * section and outside of call_rcu thread, so we postpone its execution
366 * using ht_cleanup_push. It is simpler than to change the semantic of
367 * the many callers of delete_ust_app_session().
36b588ed
MD
368 */
369static
370void delete_ust_app_channel_rcu(struct rcu_head *head)
371{
372 struct ust_app_channel *ua_chan =
373 caa_container_of(head, struct ust_app_channel, rcu_head);
374
0b2dc8df
MD
375 ht_cleanup_push(ua_chan->ctx);
376 ht_cleanup_push(ua_chan->events);
36b588ed
MD
377 free(ua_chan);
378}
379
fb83fe64
JD
380/*
381 * Extract the lost packet or discarded events counter when the channel is
382 * being deleted and store the value in the parent channel so we can
383 * access it from lttng list and at stop/destroy.
82cac6d2
JG
384 *
385 * The session list lock must be held by the caller.
fb83fe64
JD
386 */
387static
388void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan)
389{
390 uint64_t discarded = 0, lost = 0;
391 struct ltt_session *session;
392 struct ltt_ust_channel *uchan;
393
394 if (ua_chan->attr.type != LTTNG_UST_CHAN_PER_CPU) {
395 return;
396 }
397
398 rcu_read_lock();
399 session = session_find_by_id(ua_chan->session->tracing_id);
d68ec974
JG
400 if (!session || !session->ust_session) {
401 /*
402 * Not finding the session is not an error because there are
403 * multiple ways the channels can be torn down.
404 *
405 * 1) The session daemon can initiate the destruction of the
406 * ust app session after receiving a destroy command or
407 * during its shutdown/teardown.
408 * 2) The application, since we are in per-pid tracing, is
409 * unregistering and tearing down its ust app session.
410 *
411 * Both paths are protected by the session list lock which
412 * ensures that the accounting of lost packets and discarded
413 * events is done exactly once. The session is then unpublished
414 * from the session list, resulting in this condition.
415 */
fb83fe64
JD
416 goto end;
417 }
418
419 if (ua_chan->attr.overwrite) {
420 consumer_get_lost_packets(ua_chan->session->tracing_id,
421 ua_chan->key, session->ust_session->consumer,
422 &lost);
423 } else {
424 consumer_get_discarded_events(ua_chan->session->tracing_id,
425 ua_chan->key, session->ust_session->consumer,
426 &discarded);
427 }
428 uchan = trace_ust_find_channel_by_name(
429 session->ust_session->domain_global.channels,
430 ua_chan->name);
431 if (!uchan) {
432 ERR("Missing UST channel to store discarded counters");
433 goto end;
434 }
435
436 uchan->per_pid_closed_app_discarded += discarded;
437 uchan->per_pid_closed_app_lost += lost;
438
439end:
440 rcu_read_unlock();
e32d7f27
JG
441 if (session) {
442 session_put(session);
443 }
fb83fe64
JD
444}
445
d80a6244
DG
446/*
447 * Delete ust app channel safely. RCU read lock must be held before calling
448 * this function.
82cac6d2
JG
449 *
450 * The session list lock must be held by the caller.
d80a6244 451 */
8b366481 452static
d0b96690
DG
453void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan,
454 struct ust_app *app)
d80a6244
DG
455{
456 int ret;
bec39940 457 struct lttng_ht_iter iter;
d80a6244 458 struct ust_app_event *ua_event;
55cc08a6 459 struct ust_app_ctx *ua_ctx;
030a66fa 460 struct ust_app_stream *stream, *stmp;
7972aab2 461 struct ust_registry_session *registry;
d80a6244 462
ffe60014
DG
463 assert(ua_chan);
464
465 DBG3("UST app deleting channel %s", ua_chan->name);
466
55cc08a6 467 /* Wipe stream */
d80a6244 468 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
84cd17c6 469 cds_list_del(&stream->list);
fb45065e 470 delete_ust_app_stream(sock, stream, app);
d80a6244
DG
471 }
472
55cc08a6 473 /* Wipe context */
bec39940 474 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
31746f93 475 cds_list_del(&ua_ctx->list);
bec39940 476 ret = lttng_ht_del(ua_chan->ctx, &iter);
55cc08a6 477 assert(!ret);
fb45065e 478 delete_ust_app_ctx(sock, ua_ctx, app);
55cc08a6 479 }
d80a6244 480
55cc08a6 481 /* Wipe events */
bec39940
DG
482 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
483 node.node) {
484 ret = lttng_ht_del(ua_chan->events, &iter);
525b0740 485 assert(!ret);
fb45065e 486 delete_ust_app_event(sock, ua_event, app);
d80a6244 487 }
edb67388 488
c8335706
MD
489 if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) {
490 /* Wipe and free registry from session registry. */
491 registry = get_session_registry(ua_chan->session);
492 if (registry) {
e9404c27 493 ust_registry_channel_del_free(registry, ua_chan->key,
e38d96f9
MD
494 sock >= 0);
495 }
45798a31
JG
496 /*
497 * A negative socket can be used by the caller when
498 * cleaning-up a ua_chan in an error path. Skip the
499 * accounting in this case.
500 */
e38d96f9
MD
501 if (sock >= 0) {
502 save_per_pid_lost_discarded_counters(ua_chan);
c8335706 503 }
7972aab2 504 }
d0b96690 505
edb67388 506 if (ua_chan->obj != NULL) {
d0b96690
DG
507 /* Remove channel from application UST object descriptor. */
508 iter.iter.node = &ua_chan->ust_objd_node.node;
c6e62271
DG
509 ret = lttng_ht_del(app->ust_objd, &iter);
510 assert(!ret);
fb45065e 511 pthread_mutex_lock(&app->sock_lock);
ffe60014 512 ret = ustctl_release_object(sock, ua_chan->obj);
fb45065e 513 pthread_mutex_unlock(&app->sock_lock);
ffe60014
DG
514 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
515 ERR("UST app sock %d release channel obj failed with ret %d",
516 sock, ret);
517 }
7972aab2 518 lttng_fd_put(LTTNG_FD_APPS, 1);
edb67388
DG
519 free(ua_chan->obj);
520 }
36b588ed 521 call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu);
d80a6244
DG
522}
523
fb45065e
MD
524int ust_app_register_done(struct ust_app *app)
525{
526 int ret;
527
528 pthread_mutex_lock(&app->sock_lock);
529 ret = ustctl_register_done(app->sock);
530 pthread_mutex_unlock(&app->sock_lock);
531 return ret;
532}
533
534int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data)
535{
536 int ret, sock;
537
538 if (app) {
539 pthread_mutex_lock(&app->sock_lock);
540 sock = app->sock;
541 } else {
542 sock = -1;
543 }
544 ret = ustctl_release_object(sock, data);
545 if (app) {
546 pthread_mutex_unlock(&app->sock_lock);
547 }
548 return ret;
549}
550
331744e3 551/*
1b532a60
DG
552 * Push metadata to consumer socket.
553 *
dc2bbdae
MD
554 * RCU read-side lock must be held to guarantee existance of socket.
555 * Must be called with the ust app session lock held.
556 * Must be called with the registry lock held.
331744e3
JD
557 *
558 * On success, return the len of metadata pushed or else a negative value.
2c57e06d
MD
559 * Returning a -EPIPE return value means we could not send the metadata,
560 * but it can be caused by recoverable errors (e.g. the application has
561 * terminated concurrently).
331744e3
JD
562 */
563ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
564 struct consumer_socket *socket, int send_zero_data)
565{
566 int ret;
567 char *metadata_str = NULL;
c585821b 568 size_t len, offset, new_metadata_len_sent;
331744e3 569 ssize_t ret_val;
93ec662e 570 uint64_t metadata_key, metadata_version;
331744e3
JD
571
572 assert(registry);
573 assert(socket);
1b532a60 574
c585821b
MD
575 metadata_key = registry->metadata_key;
576
ce34fcd0 577 /*
dc2bbdae
MD
578 * Means that no metadata was assigned to the session. This can
579 * happens if no start has been done previously.
ce34fcd0 580 */
c585821b 581 if (!metadata_key) {
ce34fcd0
MD
582 return 0;
583 }
584
331744e3
JD
585 offset = registry->metadata_len_sent;
586 len = registry->metadata_len - registry->metadata_len_sent;
c585821b 587 new_metadata_len_sent = registry->metadata_len;
93ec662e 588 metadata_version = registry->metadata_version;
331744e3
JD
589 if (len == 0) {
590 DBG3("No metadata to push for metadata key %" PRIu64,
591 registry->metadata_key);
592 ret_val = len;
593 if (send_zero_data) {
594 DBG("No metadata to push");
595 goto push_data;
596 }
597 goto end;
598 }
599
600 /* Allocate only what we have to send. */
601 metadata_str = zmalloc(len);
602 if (!metadata_str) {
603 PERROR("zmalloc ust app metadata string");
604 ret_val = -ENOMEM;
605 goto error;
606 }
c585821b 607 /* Copy what we haven't sent out. */
331744e3 608 memcpy(metadata_str, registry->metadata + offset, len);
331744e3
JD
609
610push_data:
c585821b
MD
611 pthread_mutex_unlock(&registry->lock);
612 /*
613 * We need to unlock the registry while we push metadata to
614 * break a circular dependency between the consumerd metadata
615 * lock and the sessiond registry lock. Indeed, pushing metadata
616 * to the consumerd awaits that it gets pushed all the way to
617 * relayd, but doing so requires grabbing the metadata lock. If
618 * a concurrent metadata request is being performed by
619 * consumerd, this can try to grab the registry lock on the
620 * sessiond while holding the metadata lock on the consumer
621 * daemon. Those push and pull schemes are performed on two
622 * different bidirectionnal communication sockets.
623 */
624 ret = consumer_push_metadata(socket, metadata_key,
93ec662e 625 metadata_str, len, offset, metadata_version);
c585821b 626 pthread_mutex_lock(&registry->lock);
331744e3 627 if (ret < 0) {
000baf6a 628 /*
dc2bbdae
MD
629 * There is an acceptable race here between the registry
630 * metadata key assignment and the creation on the
631 * consumer. The session daemon can concurrently push
632 * metadata for this registry while being created on the
633 * consumer since the metadata key of the registry is
634 * assigned *before* it is setup to avoid the consumer
635 * to ask for metadata that could possibly be not found
636 * in the session daemon.
000baf6a 637 *
dc2bbdae
MD
638 * The metadata will get pushed either by the session
639 * being stopped or the consumer requesting metadata if
640 * that race is triggered.
000baf6a
DG
641 */
642 if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) {
643 ret = 0;
c585821b
MD
644 } else {
645 ERR("Error pushing metadata to consumer");
000baf6a 646 }
331744e3
JD
647 ret_val = ret;
648 goto error_push;
c585821b
MD
649 } else {
650 /*
651 * Metadata may have been concurrently pushed, since
652 * we're not holding the registry lock while pushing to
653 * consumer. This is handled by the fact that we send
654 * the metadata content, size, and the offset at which
655 * that metadata belongs. This may arrive out of order
656 * on the consumer side, and the consumer is able to
657 * deal with overlapping fragments. The consumer
658 * supports overlapping fragments, which must be
659 * contiguous starting from offset 0. We keep the
660 * largest metadata_len_sent value of the concurrent
661 * send.
662 */
663 registry->metadata_len_sent =
664 max_t(size_t, registry->metadata_len_sent,
665 new_metadata_len_sent);
331744e3 666 }
331744e3
JD
667 free(metadata_str);
668 return len;
669
670end:
671error:
ce34fcd0
MD
672 if (ret_val) {
673 /*
dc2bbdae
MD
674 * On error, flag the registry that the metadata is
675 * closed. We were unable to push anything and this
676 * means that either the consumer is not responding or
677 * the metadata cache has been destroyed on the
678 * consumer.
ce34fcd0
MD
679 */
680 registry->metadata_closed = 1;
681 }
331744e3
JD
682error_push:
683 free(metadata_str);
684 return ret_val;
685}
686
d88aee68 687/*
ce34fcd0 688 * For a given application and session, push metadata to consumer.
331744e3
JD
689 * Either sock or consumer is required : if sock is NULL, the default
690 * socket to send the metadata is retrieved from consumer, if sock
691 * is not NULL we use it to send the metadata.
ce34fcd0 692 * RCU read-side lock must be held while calling this function,
dc2bbdae
MD
693 * therefore ensuring existance of registry. It also ensures existance
694 * of socket throughout this function.
d88aee68
DG
695 *
696 * Return 0 on success else a negative error.
2c57e06d
MD
697 * Returning a -EPIPE return value means we could not send the metadata,
698 * but it can be caused by recoverable errors (e.g. the application has
699 * terminated concurrently).
d88aee68 700 */
7972aab2
DG
701static int push_metadata(struct ust_registry_session *registry,
702 struct consumer_output *consumer)
d88aee68 703{
331744e3
JD
704 int ret_val;
705 ssize_t ret;
d88aee68
DG
706 struct consumer_socket *socket;
707
7972aab2
DG
708 assert(registry);
709 assert(consumer);
710
ce34fcd0 711 pthread_mutex_lock(&registry->lock);
ce34fcd0 712 if (registry->metadata_closed) {
dc2bbdae
MD
713 ret_val = -EPIPE;
714 goto error;
d88aee68
DG
715 }
716
d88aee68 717 /* Get consumer socket to use to push the metadata.*/
7972aab2
DG
718 socket = consumer_find_socket_by_bitness(registry->bits_per_long,
719 consumer);
d88aee68 720 if (!socket) {
331744e3 721 ret_val = -1;
ce34fcd0 722 goto error;
d88aee68
DG
723 }
724
331744e3 725 ret = ust_app_push_metadata(registry, socket, 0);
d88aee68 726 if (ret < 0) {
331744e3 727 ret_val = ret;
ce34fcd0 728 goto error;
d88aee68 729 }
dc2bbdae 730 pthread_mutex_unlock(&registry->lock);
d88aee68
DG
731 return 0;
732
ce34fcd0 733error:
dc2bbdae 734 pthread_mutex_unlock(&registry->lock);
331744e3 735 return ret_val;
d88aee68
DG
736}
737
738/*
739 * Send to the consumer a close metadata command for the given session. Once
740 * done, the metadata channel is deleted and the session metadata pointer is
dc2bbdae 741 * nullified. The session lock MUST be held unless the application is
d88aee68
DG
742 * in the destroy path.
743 *
744 * Return 0 on success else a negative value.
745 */
7972aab2
DG
746static int close_metadata(struct ust_registry_session *registry,
747 struct consumer_output *consumer)
d88aee68
DG
748{
749 int ret;
750 struct consumer_socket *socket;
751
7972aab2
DG
752 assert(registry);
753 assert(consumer);
d88aee68 754
7972aab2
DG
755 rcu_read_lock();
756
ce34fcd0
MD
757 pthread_mutex_lock(&registry->lock);
758
7972aab2 759 if (!registry->metadata_key || registry->metadata_closed) {
d88aee68 760 ret = 0;
1b532a60 761 goto end;
d88aee68
DG
762 }
763
d88aee68 764 /* Get consumer socket to use to push the metadata.*/
7972aab2
DG
765 socket = consumer_find_socket_by_bitness(registry->bits_per_long,
766 consumer);
d88aee68
DG
767 if (!socket) {
768 ret = -1;
7972aab2 769 goto error;
d88aee68
DG
770 }
771
7972aab2 772 ret = consumer_close_metadata(socket, registry->metadata_key);
d88aee68 773 if (ret < 0) {
7972aab2 774 goto error;
d88aee68
DG
775 }
776
d88aee68 777error:
1b532a60
DG
778 /*
779 * Metadata closed. Even on error this means that the consumer is not
780 * responding or not found so either way a second close should NOT be emit
781 * for this registry.
782 */
783 registry->metadata_closed = 1;
784end:
ce34fcd0 785 pthread_mutex_unlock(&registry->lock);
7972aab2 786 rcu_read_unlock();
d88aee68
DG
787 return ret;
788}
789
36b588ed
MD
790/*
791 * We need to execute ht_destroy outside of RCU read-side critical
0b2dc8df
MD
792 * section and outside of call_rcu thread, so we postpone its execution
793 * using ht_cleanup_push. It is simpler than to change the semantic of
794 * the many callers of delete_ust_app_session().
36b588ed
MD
795 */
796static
797void delete_ust_app_session_rcu(struct rcu_head *head)
798{
799 struct ust_app_session *ua_sess =
800 caa_container_of(head, struct ust_app_session, rcu_head);
801
0b2dc8df 802 ht_cleanup_push(ua_sess->channels);
36b588ed
MD
803 free(ua_sess);
804}
805
d80a6244
DG
806/*
807 * Delete ust app session safely. RCU read lock must be held before calling
808 * this function.
82cac6d2
JG
809 *
810 * The session list lock must be held by the caller.
d80a6244 811 */
8b366481 812static
d0b96690
DG
813void delete_ust_app_session(int sock, struct ust_app_session *ua_sess,
814 struct ust_app *app)
d80a6244
DG
815{
816 int ret;
bec39940 817 struct lttng_ht_iter iter;
d80a6244 818 struct ust_app_channel *ua_chan;
7972aab2 819 struct ust_registry_session *registry;
d80a6244 820
d88aee68
DG
821 assert(ua_sess);
822
1b532a60
DG
823 pthread_mutex_lock(&ua_sess->lock);
824
b161602a
MD
825 assert(!ua_sess->deleted);
826 ua_sess->deleted = true;
827
7972aab2 828 registry = get_session_registry(ua_sess);
fad1ed2f 829 /* Registry can be null on error path during initialization. */
ce34fcd0 830 if (registry) {
d88aee68 831 /* Push metadata for application before freeing the application. */
7972aab2 832 (void) push_metadata(registry, ua_sess->consumer);
d88aee68 833
7972aab2
DG
834 /*
835 * Don't ask to close metadata for global per UID buffers. Close
1b532a60
DG
836 * metadata only on destroy trace session in this case. Also, the
837 * previous push metadata could have flag the metadata registry to
838 * close so don't send a close command if closed.
7972aab2 839 */
ce34fcd0 840 if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) {
7972aab2
DG
841 /* And ask to close it for this session registry. */
842 (void) close_metadata(registry, ua_sess->consumer);
843 }
d80a6244
DG
844 }
845
bec39940
DG
846 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
847 node.node) {
848 ret = lttng_ht_del(ua_sess->channels, &iter);
525b0740 849 assert(!ret);
d0b96690 850 delete_ust_app_channel(sock, ua_chan, app);
d80a6244 851 }
d80a6244 852
7972aab2
DG
853 /* In case of per PID, the registry is kept in the session. */
854 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) {
855 struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id);
856 if (reg_pid) {
fad1ed2f
JR
857 /*
858 * Registry can be null on error path during
859 * initialization.
860 */
7972aab2
DG
861 buffer_reg_pid_remove(reg_pid);
862 buffer_reg_pid_destroy(reg_pid);
863 }
864 }
d0b96690 865
aee6bafd 866 if (ua_sess->handle != -1) {
fb45065e 867 pthread_mutex_lock(&app->sock_lock);
ffe60014 868 ret = ustctl_release_handle(sock, ua_sess->handle);
fb45065e 869 pthread_mutex_unlock(&app->sock_lock);
ffe60014
DG
870 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
871 ERR("UST app sock %d release session handle failed with ret %d",
872 sock, ret);
873 }
10b56aef
MD
874 /* Remove session from application UST object descriptor. */
875 iter.iter.node = &ua_sess->ust_objd_node.node;
876 ret = lttng_ht_del(app->ust_sessions_objd, &iter);
877 assert(!ret);
aee6bafd 878 }
10b56aef 879
1b532a60
DG
880 pthread_mutex_unlock(&ua_sess->lock);
881
6addfa37
MD
882 consumer_output_put(ua_sess->consumer);
883
36b588ed 884 call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu);
d80a6244 885}
91d76f53
DG
886
887/*
284d8f55
DG
888 * Delete a traceable application structure from the global list. Never call
889 * this function outside of a call_rcu call.
36b588ed
MD
890 *
891 * RCU read side lock should _NOT_ be held when calling this function.
91d76f53 892 */
8b366481
DG
893static
894void delete_ust_app(struct ust_app *app)
91d76f53 895{
8b366481 896 int ret, sock;
d42f20df 897 struct ust_app_session *ua_sess, *tmp_ua_sess;
44d3bd01 898
82cac6d2
JG
899 /*
900 * The session list lock must be held during this function to guarantee
901 * the existence of ua_sess.
902 */
903 session_lock_list();
d80a6244 904 /* Delete ust app sessions info */
852d0037
DG
905 sock = app->sock;
906 app->sock = -1;
d80a6244 907
8b366481 908 /* Wipe sessions */
d42f20df
DG
909 cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head,
910 teardown_node) {
911 /* Free every object in the session and the session. */
36b588ed 912 rcu_read_lock();
d0b96690 913 delete_ust_app_session(sock, ua_sess, app);
36b588ed 914 rcu_read_unlock();
d80a6244 915 }
36b588ed 916
0b2dc8df 917 ht_cleanup_push(app->sessions);
10b56aef 918 ht_cleanup_push(app->ust_sessions_objd);
0b2dc8df 919 ht_cleanup_push(app->ust_objd);
d80a6244 920
6414a713 921 /*
852d0037
DG
922 * Wait until we have deleted the application from the sock hash table
923 * before closing this socket, otherwise an application could re-use the
924 * socket ID and race with the teardown, using the same hash table entry.
925 *
926 * It's OK to leave the close in call_rcu. We want it to stay unique for
927 * all RCU readers that could run concurrently with unregister app,
928 * therefore we _need_ to only close that socket after a grace period. So
929 * it should stay in this RCU callback.
930 *
931 * This close() is a very important step of the synchronization model so
932 * every modification to this function must be carefully reviewed.
6414a713 933 */
799e2c4f
MD
934 ret = close(sock);
935 if (ret) {
936 PERROR("close");
937 }
4063050c 938 lttng_fd_put(LTTNG_FD_APPS, 1);
d80a6244 939
852d0037 940 DBG2("UST app pid %d deleted", app->pid);
284d8f55 941 free(app);
82cac6d2 942 session_unlock_list();
099e26bd
DG
943}
944
945/*
f6a9efaa 946 * URCU intermediate call to delete an UST app.
099e26bd 947 */
8b366481
DG
948static
949void delete_ust_app_rcu(struct rcu_head *head)
099e26bd 950{
bec39940
DG
951 struct lttng_ht_node_ulong *node =
952 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa 953 struct ust_app *app =
852d0037 954 caa_container_of(node, struct ust_app, pid_n);
f6a9efaa 955
852d0037 956 DBG3("Call RCU deleting app PID %d", app->pid);
f6a9efaa 957 delete_ust_app(app);
099e26bd
DG
958}
959
ffe60014
DG
960/*
961 * Delete the session from the application ht and delete the data structure by
962 * freeing every object inside and releasing them.
82cac6d2
JG
963 *
964 * The session list lock must be held by the caller.
ffe60014 965 */
d0b96690 966static void destroy_app_session(struct ust_app *app,
ffe60014
DG
967 struct ust_app_session *ua_sess)
968{
969 int ret;
970 struct lttng_ht_iter iter;
971
972 assert(app);
973 assert(ua_sess);
974
975 iter.iter.node = &ua_sess->node.node;
976 ret = lttng_ht_del(app->sessions, &iter);
977 if (ret) {
978 /* Already scheduled for teardown. */
979 goto end;
980 }
981
982 /* Once deleted, free the data structure. */
d0b96690 983 delete_ust_app_session(app->sock, ua_sess, app);
ffe60014
DG
984
985end:
986 return;
987}
988
8b366481
DG
989/*
990 * Alloc new UST app session.
991 */
992static
40bbd087 993struct ust_app_session *alloc_ust_app_session(void)
8b366481
DG
994{
995 struct ust_app_session *ua_sess;
996
997 /* Init most of the default value by allocating and zeroing */
998 ua_sess = zmalloc(sizeof(struct ust_app_session));
999 if (ua_sess == NULL) {
1000 PERROR("malloc");
ffe60014 1001 goto error_free;
8b366481
DG
1002 }
1003
1004 ua_sess->handle = -1;
bec39940 1005 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
ad7a9107 1006 ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA;
84ad93e8 1007 pthread_mutex_init(&ua_sess->lock, NULL);
ad7a9107 1008
8b366481
DG
1009 return ua_sess;
1010
ffe60014 1011error_free:
8b366481
DG
1012 return NULL;
1013}
1014
1015/*
1016 * Alloc new UST app channel.
1017 */
1018static
1019struct ust_app_channel *alloc_ust_app_channel(char *name,
d0b96690 1020 struct ust_app_session *ua_sess,
ffe60014 1021 struct lttng_ust_channel_attr *attr)
8b366481
DG
1022{
1023 struct ust_app_channel *ua_chan;
1024
1025 /* Init most of the default value by allocating and zeroing */
1026 ua_chan = zmalloc(sizeof(struct ust_app_channel));
1027 if (ua_chan == NULL) {
1028 PERROR("malloc");
1029 goto error;
1030 }
1031
1032 /* Setup channel name */
1033 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
1034 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
1035
1036 ua_chan->enabled = 1;
1037 ua_chan->handle = -1;
45893984 1038 ua_chan->session = ua_sess;
ffe60014 1039 ua_chan->key = get_next_channel_key();
bec39940
DG
1040 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1041 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
1042 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
8b366481
DG
1043
1044 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
31746f93 1045 CDS_INIT_LIST_HEAD(&ua_chan->ctx_list);
8b366481
DG
1046
1047 /* Copy attributes */
1048 if (attr) {
ffe60014 1049 /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */
2fe6e7f5
DG
1050 ua_chan->attr.subbuf_size = attr->subbuf_size;
1051 ua_chan->attr.num_subbuf = attr->num_subbuf;
1052 ua_chan->attr.overwrite = attr->overwrite;
1053 ua_chan->attr.switch_timer_interval = attr->switch_timer_interval;
1054 ua_chan->attr.read_timer_interval = attr->read_timer_interval;
1055 ua_chan->attr.output = attr->output;
491d1539 1056 ua_chan->attr.blocking_timeout = attr->u.s.blocking_timeout;
8b366481 1057 }
ffe60014
DG
1058 /* By default, the channel is a per cpu channel. */
1059 ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU;
8b366481
DG
1060
1061 DBG3("UST app channel %s allocated", ua_chan->name);
1062
1063 return ua_chan;
1064
1065error:
1066 return NULL;
1067}
1068
37f1c236
DG
1069/*
1070 * Allocate and initialize a UST app stream.
1071 *
1072 * Return newly allocated stream pointer or NULL on error.
1073 */
ffe60014 1074struct ust_app_stream *ust_app_alloc_stream(void)
37f1c236
DG
1075{
1076 struct ust_app_stream *stream = NULL;
1077
1078 stream = zmalloc(sizeof(*stream));
1079 if (stream == NULL) {
1080 PERROR("zmalloc ust app stream");
1081 goto error;
1082 }
1083
1084 /* Zero could be a valid value for a handle so flag it to -1. */
1085 stream->handle = -1;
1086
1087error:
1088 return stream;
1089}
1090
8b366481
DG
1091/*
1092 * Alloc new UST app event.
1093 */
1094static
1095struct ust_app_event *alloc_ust_app_event(char *name,
1096 struct lttng_ust_event *attr)
1097{
1098 struct ust_app_event *ua_event;
1099
1100 /* Init most of the default value by allocating and zeroing */
1101 ua_event = zmalloc(sizeof(struct ust_app_event));
1102 if (ua_event == NULL) {
1103 PERROR("malloc");
1104 goto error;
1105 }
1106
1107 ua_event->enabled = 1;
1108 strncpy(ua_event->name, name, sizeof(ua_event->name));
1109 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
bec39940 1110 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
8b366481
DG
1111
1112 /* Copy attributes */
1113 if (attr) {
1114 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
1115 }
1116
1117 DBG3("UST app event %s allocated", ua_event->name);
1118
1119 return ua_event;
1120
1121error:
1122 return NULL;
1123}
1124
1125/*
1126 * Alloc new UST app context.
1127 */
1128static
bdf64013 1129struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx)
8b366481
DG
1130{
1131 struct ust_app_ctx *ua_ctx;
1132
1133 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
1134 if (ua_ctx == NULL) {
1135 goto error;
1136 }
1137
31746f93
DG
1138 CDS_INIT_LIST_HEAD(&ua_ctx->list);
1139
8b366481
DG
1140 if (uctx) {
1141 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
bdf64013
JG
1142 if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) {
1143 char *provider_name = NULL, *ctx_name = NULL;
1144
1145 provider_name = strdup(uctx->u.app_ctx.provider_name);
1146 ctx_name = strdup(uctx->u.app_ctx.ctx_name);
1147 if (!provider_name || !ctx_name) {
1148 free(provider_name);
1149 free(ctx_name);
1150 goto error;
1151 }
1152
1153 ua_ctx->ctx.u.app_ctx.provider_name = provider_name;
1154 ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name;
1155 }
8b366481
DG
1156 }
1157
1158 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
8b366481 1159 return ua_ctx;
bdf64013
JG
1160error:
1161 free(ua_ctx);
1162 return NULL;
8b366481
DG
1163}
1164
025faf73
DG
1165/*
1166 * Allocate a filter and copy the given original filter.
1167 *
1168 * Return allocated filter or NULL on error.
1169 */
51755dc8
JG
1170static struct lttng_filter_bytecode *copy_filter_bytecode(
1171 struct lttng_filter_bytecode *orig_f)
025faf73 1172{
51755dc8 1173 struct lttng_filter_bytecode *filter = NULL;
025faf73
DG
1174
1175 /* Copy filter bytecode */
1176 filter = zmalloc(sizeof(*filter) + orig_f->len);
1177 if (!filter) {
51755dc8 1178 PERROR("zmalloc alloc filter bytecode");
025faf73
DG
1179 goto error;
1180 }
1181
1182 memcpy(filter, orig_f, sizeof(*filter) + orig_f->len);
1183
1184error:
1185 return filter;
1186}
1187
51755dc8
JG
1188/*
1189 * Create a liblttng-ust filter bytecode from given bytecode.
1190 *
1191 * Return allocated filter or NULL on error.
1192 */
1193static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode(
1194 struct lttng_filter_bytecode *orig_f)
1195{
1196 struct lttng_ust_filter_bytecode *filter = NULL;
1197
1198 /* Copy filter bytecode */
1199 filter = zmalloc(sizeof(*filter) + orig_f->len);
1200 if (!filter) {
1201 PERROR("zmalloc alloc ust filter bytecode");
1202 goto error;
1203 }
1204
1205 assert(sizeof(struct lttng_filter_bytecode) ==
1206 sizeof(struct lttng_ust_filter_bytecode));
1207 memcpy(filter, orig_f, sizeof(*filter) + orig_f->len);
1208error:
1209 return filter;
1210}
1211
099e26bd 1212/*
421cb601
DG
1213 * Find an ust_app using the sock and return it. RCU read side lock must be
1214 * held before calling this helper function.
099e26bd 1215 */
f20baf8e 1216struct ust_app *ust_app_find_by_sock(int sock)
099e26bd 1217{
bec39940 1218 struct lttng_ht_node_ulong *node;
bec39940 1219 struct lttng_ht_iter iter;
f6a9efaa 1220
852d0037 1221 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 1222 node = lttng_ht_iter_get_node_ulong(&iter);
f6a9efaa
DG
1223 if (node == NULL) {
1224 DBG2("UST app find by sock %d not found", sock);
f6a9efaa
DG
1225 goto error;
1226 }
852d0037
DG
1227
1228 return caa_container_of(node, struct ust_app, sock_n);
f6a9efaa
DG
1229
1230error:
1231 return NULL;
099e26bd
DG
1232}
1233
d0b96690
DG
1234/*
1235 * Find an ust_app using the notify sock and return it. RCU read side lock must
1236 * be held before calling this helper function.
1237 */
1238static struct ust_app *find_app_by_notify_sock(int sock)
1239{
1240 struct lttng_ht_node_ulong *node;
1241 struct lttng_ht_iter iter;
1242
1243 lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock),
1244 &iter);
1245 node = lttng_ht_iter_get_node_ulong(&iter);
1246 if (node == NULL) {
1247 DBG2("UST app find by notify sock %d not found", sock);
1248 goto error;
1249 }
1250
1251 return caa_container_of(node, struct ust_app, notify_sock_n);
1252
1253error:
1254 return NULL;
1255}
1256
025faf73
DG
1257/*
1258 * Lookup for an ust app event based on event name, filter bytecode and the
1259 * event loglevel.
1260 *
1261 * Return an ust_app_event object or NULL on error.
1262 */
18eace3b 1263static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht,
88e3c2f5 1264 const char *name, const struct lttng_filter_bytecode *filter,
2106efa0 1265 int loglevel_value,
39c5a3a7 1266 const struct lttng_event_exclusion *exclusion)
18eace3b
DG
1267{
1268 struct lttng_ht_iter iter;
1269 struct lttng_ht_node_str *node;
1270 struct ust_app_event *event = NULL;
1271 struct ust_app_ht_key key;
18eace3b
DG
1272
1273 assert(name);
1274 assert(ht);
1275
1276 /* Setup key for event lookup. */
1277 key.name = name;
1278 key.filter = filter;
2106efa0 1279 key.loglevel_type = loglevel_value;
39c5a3a7 1280 /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */
51755dc8 1281 key.exclusion = exclusion;
18eace3b 1282
025faf73
DG
1283 /* Lookup using the event name as hash and a custom match fct. */
1284 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
1285 ht_match_ust_app_event, &key, &iter.iter);
18eace3b
DG
1286 node = lttng_ht_iter_get_node_str(&iter);
1287 if (node == NULL) {
1288 goto end;
1289 }
1290
1291 event = caa_container_of(node, struct ust_app_event, node);
1292
1293end:
18eace3b
DG
1294 return event;
1295}
1296
55cc08a6
DG
1297/*
1298 * Create the channel context on the tracer.
d0b96690
DG
1299 *
1300 * Called with UST app session lock held.
55cc08a6
DG
1301 */
1302static
1303int create_ust_channel_context(struct ust_app_channel *ua_chan,
1304 struct ust_app_ctx *ua_ctx, struct ust_app *app)
1305{
1306 int ret;
1307
840cb59c 1308 health_code_update();
86acf0da 1309
fb45065e 1310 pthread_mutex_lock(&app->sock_lock);
852d0037 1311 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
55cc08a6 1312 ua_chan->obj, &ua_ctx->obj);
fb45065e 1313 pthread_mutex_unlock(&app->sock_lock);
55cc08a6 1314 if (ret < 0) {
ffe60014
DG
1315 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1316 ERR("UST app create channel context failed for app (pid: %d) "
1317 "with ret %d", app->pid, ret);
1318 } else {
3757b385
DG
1319 /*
1320 * This is normal behavior, an application can die during the
1321 * creation process. Don't report an error so the execution can
1322 * continue normally.
1323 */
1324 ret = 0;
88e3c2f5 1325 DBG3("UST app add context failed. Application is dead.");
ffe60014 1326 }
55cc08a6
DG
1327 goto error;
1328 }
1329
1330 ua_ctx->handle = ua_ctx->obj->handle;
1331
d0b96690
DG
1332 DBG2("UST app context handle %d created successfully for channel %s",
1333 ua_ctx->handle, ua_chan->name);
55cc08a6
DG
1334
1335error:
840cb59c 1336 health_code_update();
55cc08a6
DG
1337 return ret;
1338}
1339
53a80697
MD
1340/*
1341 * Set the filter on the tracer.
1342 */
1343static
1344int set_ust_event_filter(struct ust_app_event *ua_event,
1345 struct ust_app *app)
1346{
1347 int ret;
51755dc8 1348 struct lttng_ust_filter_bytecode *ust_bytecode = NULL;
53a80697 1349
840cb59c 1350 health_code_update();
86acf0da 1351
53a80697 1352 if (!ua_event->filter) {
86acf0da
DG
1353 ret = 0;
1354 goto error;
53a80697
MD
1355 }
1356
51755dc8
JG
1357 ust_bytecode = create_ust_bytecode_from_bytecode(ua_event->filter);
1358 if (!ust_bytecode) {
1359 ret = -LTTNG_ERR_NOMEM;
1360 goto error;
1361 }
fb45065e 1362 pthread_mutex_lock(&app->sock_lock);
51755dc8 1363 ret = ustctl_set_filter(app->sock, ust_bytecode,
53a80697 1364 ua_event->obj);
fb45065e 1365 pthread_mutex_unlock(&app->sock_lock);
53a80697 1366 if (ret < 0) {
ffe60014
DG
1367 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1368 ERR("UST app event %s filter failed for app (pid: %d) "
1369 "with ret %d", ua_event->attr.name, app->pid, ret);
1370 } else {
3757b385
DG
1371 /*
1372 * This is normal behavior, an application can die during the
1373 * creation process. Don't report an error so the execution can
1374 * continue normally.
1375 */
1376 ret = 0;
ffe60014
DG
1377 DBG3("UST app filter event failed. Application is dead.");
1378 }
53a80697
MD
1379 goto error;
1380 }
1381
1382 DBG2("UST filter set successfully for event %s", ua_event->name);
1383
1384error:
840cb59c 1385 health_code_update();
51755dc8 1386 free(ust_bytecode);
53a80697
MD
1387 return ret;
1388}
1389
51755dc8
JG
1390static
1391struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion(
1392 struct lttng_event_exclusion *exclusion)
1393{
1394 struct lttng_ust_event_exclusion *ust_exclusion = NULL;
1395 size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) +
1396 LTTNG_UST_SYM_NAME_LEN * exclusion->count;
1397
1398 ust_exclusion = zmalloc(exclusion_alloc_size);
1399 if (!ust_exclusion) {
1400 PERROR("malloc");
1401 goto end;
1402 }
1403
1404 assert(sizeof(struct lttng_event_exclusion) ==
1405 sizeof(struct lttng_ust_event_exclusion));
1406 memcpy(ust_exclusion, exclusion, exclusion_alloc_size);
1407end:
1408 return ust_exclusion;
1409}
1410
7cc9a73c
JI
1411/*
1412 * Set event exclusions on the tracer.
1413 */
1414static
1415int set_ust_event_exclusion(struct ust_app_event *ua_event,
1416 struct ust_app *app)
1417{
1418 int ret;
51755dc8 1419 struct lttng_ust_event_exclusion *ust_exclusion = NULL;
7cc9a73c
JI
1420
1421 health_code_update();
1422
1423 if (!ua_event->exclusion || !ua_event->exclusion->count) {
1424 ret = 0;
1425 goto error;
1426 }
1427
51755dc8
JG
1428 ust_exclusion = create_ust_exclusion_from_exclusion(
1429 ua_event->exclusion);
1430 if (!ust_exclusion) {
1431 ret = -LTTNG_ERR_NOMEM;
1432 goto error;
1433 }
fb45065e 1434 pthread_mutex_lock(&app->sock_lock);
51755dc8 1435 ret = ustctl_set_exclusion(app->sock, ust_exclusion, ua_event->obj);
fb45065e 1436 pthread_mutex_unlock(&app->sock_lock);
7cc9a73c
JI
1437 if (ret < 0) {
1438 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1439 ERR("UST app event %s exclusions failed for app (pid: %d) "
1440 "with ret %d", ua_event->attr.name, app->pid, ret);
1441 } else {
1442 /*
1443 * This is normal behavior, an application can die during the
1444 * creation process. Don't report an error so the execution can
1445 * continue normally.
1446 */
1447 ret = 0;
1448 DBG3("UST app event exclusion failed. Application is dead.");
1449 }
1450 goto error;
1451 }
1452
1453 DBG2("UST exclusion set successfully for event %s", ua_event->name);
1454
1455error:
1456 health_code_update();
51755dc8 1457 free(ust_exclusion);
7cc9a73c
JI
1458 return ret;
1459}
1460
9730260e
DG
1461/*
1462 * Disable the specified event on to UST tracer for the UST session.
1463 */
1464static int disable_ust_event(struct ust_app *app,
1465 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
1466{
1467 int ret;
1468
840cb59c 1469 health_code_update();
86acf0da 1470
fb45065e 1471 pthread_mutex_lock(&app->sock_lock);
852d0037 1472 ret = ustctl_disable(app->sock, ua_event->obj);
fb45065e 1473 pthread_mutex_unlock(&app->sock_lock);
9730260e 1474 if (ret < 0) {
ffe60014
DG
1475 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1476 ERR("UST app event %s disable failed for app (pid: %d) "
1477 "and session handle %d with ret %d",
1478 ua_event->attr.name, app->pid, ua_sess->handle, ret);
1479 } else {
3757b385
DG
1480 /*
1481 * This is normal behavior, an application can die during the
1482 * creation process. Don't report an error so the execution can
1483 * continue normally.
1484 */
1485 ret = 0;
ffe60014
DG
1486 DBG3("UST app disable event failed. Application is dead.");
1487 }
9730260e
DG
1488 goto error;
1489 }
1490
1491 DBG2("UST app event %s disabled successfully for app (pid: %d)",
852d0037 1492 ua_event->attr.name, app->pid);
9730260e
DG
1493
1494error:
840cb59c 1495 health_code_update();
9730260e
DG
1496 return ret;
1497}
1498
78f0bacd
DG
1499/*
1500 * Disable the specified channel on to UST tracer for the UST session.
1501 */
1502static int disable_ust_channel(struct ust_app *app,
1503 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
1504{
1505 int ret;
1506
840cb59c 1507 health_code_update();
86acf0da 1508
fb45065e 1509 pthread_mutex_lock(&app->sock_lock);
852d0037 1510 ret = ustctl_disable(app->sock, ua_chan->obj);
fb45065e 1511 pthread_mutex_unlock(&app->sock_lock);
78f0bacd 1512 if (ret < 0) {
ffe60014
DG
1513 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1514 ERR("UST app channel %s disable failed for app (pid: %d) "
1515 "and session handle %d with ret %d",
1516 ua_chan->name, app->pid, ua_sess->handle, ret);
1517 } else {
3757b385
DG
1518 /*
1519 * This is normal behavior, an application can die during the
1520 * creation process. Don't report an error so the execution can
1521 * continue normally.
1522 */
1523 ret = 0;
ffe60014
DG
1524 DBG3("UST app disable channel failed. Application is dead.");
1525 }
78f0bacd
DG
1526 goto error;
1527 }
1528
78f0bacd 1529 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
852d0037 1530 ua_chan->name, app->pid);
78f0bacd
DG
1531
1532error:
840cb59c 1533 health_code_update();
78f0bacd
DG
1534 return ret;
1535}
1536
1537/*
1538 * Enable the specified channel on to UST tracer for the UST session.
1539 */
1540static int enable_ust_channel(struct ust_app *app,
1541 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
1542{
1543 int ret;
1544
840cb59c 1545 health_code_update();
86acf0da 1546
fb45065e 1547 pthread_mutex_lock(&app->sock_lock);
852d0037 1548 ret = ustctl_enable(app->sock, ua_chan->obj);
fb45065e 1549 pthread_mutex_unlock(&app->sock_lock);
78f0bacd 1550 if (ret < 0) {
ffe60014
DG
1551 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1552 ERR("UST app channel %s enable failed for app (pid: %d) "
1553 "and session handle %d with ret %d",
1554 ua_chan->name, app->pid, ua_sess->handle, ret);
1555 } else {
3757b385
DG
1556 /*
1557 * This is normal behavior, an application can die during the
1558 * creation process. Don't report an error so the execution can
1559 * continue normally.
1560 */
1561 ret = 0;
ffe60014
DG
1562 DBG3("UST app enable channel failed. Application is dead.");
1563 }
78f0bacd
DG
1564 goto error;
1565 }
1566
1567 ua_chan->enabled = 1;
1568
1569 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
852d0037 1570 ua_chan->name, app->pid);
78f0bacd
DG
1571
1572error:
840cb59c 1573 health_code_update();
78f0bacd
DG
1574 return ret;
1575}
1576
edb67388
DG
1577/*
1578 * Enable the specified event on to UST tracer for the UST session.
1579 */
1580static int enable_ust_event(struct ust_app *app,
1581 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
1582{
1583 int ret;
1584
840cb59c 1585 health_code_update();
86acf0da 1586
fb45065e 1587 pthread_mutex_lock(&app->sock_lock);
852d0037 1588 ret = ustctl_enable(app->sock, ua_event->obj);
fb45065e 1589 pthread_mutex_unlock(&app->sock_lock);
edb67388 1590 if (ret < 0) {
ffe60014
DG
1591 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1592 ERR("UST app event %s enable failed for app (pid: %d) "
1593 "and session handle %d with ret %d",
1594 ua_event->attr.name, app->pid, ua_sess->handle, ret);
1595 } else {
3757b385
DG
1596 /*
1597 * This is normal behavior, an application can die during the
1598 * creation process. Don't report an error so the execution can
1599 * continue normally.
1600 */
1601 ret = 0;
ffe60014
DG
1602 DBG3("UST app enable event failed. Application is dead.");
1603 }
edb67388
DG
1604 goto error;
1605 }
1606
1607 DBG2("UST app event %s enabled successfully for app (pid: %d)",
852d0037 1608 ua_event->attr.name, app->pid);
edb67388
DG
1609
1610error:
840cb59c 1611 health_code_update();
edb67388
DG
1612 return ret;
1613}
1614
099e26bd 1615/*
7972aab2 1616 * Send channel and stream buffer to application.
4f3ab6ee 1617 *
ffe60014 1618 * Return 0 on success. On error, a negative value is returned.
4f3ab6ee 1619 */
7972aab2
DG
1620static int send_channel_pid_to_ust(struct ust_app *app,
1621 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
4f3ab6ee
DG
1622{
1623 int ret;
ffe60014 1624 struct ust_app_stream *stream, *stmp;
4f3ab6ee
DG
1625
1626 assert(app);
ffe60014 1627 assert(ua_sess);
4f3ab6ee 1628 assert(ua_chan);
4f3ab6ee 1629
840cb59c 1630 health_code_update();
4f3ab6ee 1631
7972aab2
DG
1632 DBG("UST app sending channel %s to UST app sock %d", ua_chan->name,
1633 app->sock);
86acf0da 1634
ffe60014
DG
1635 /* Send channel to the application. */
1636 ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
a7169585
MD
1637 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
1638 ret = -ENOTCONN; /* Caused by app exiting. */
1639 goto error;
1640 } else if (ret < 0) {
b551a063
DG
1641 goto error;
1642 }
1643
d88aee68
DG
1644 health_code_update();
1645
ffe60014
DG
1646 /* Send all streams to application. */
1647 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
1648 ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream);
a7169585
MD
1649 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
1650 ret = -ENOTCONN; /* Caused by app exiting. */
1651 goto error;
1652 } else if (ret < 0) {
ffe60014
DG
1653 goto error;
1654 }
1655 /* We don't need the stream anymore once sent to the tracer. */
1656 cds_list_del(&stream->list);
fb45065e 1657 delete_ust_app_stream(-1, stream, app);
ffe60014 1658 }
ffe60014
DG
1659 /* Flag the channel that it is sent to the application. */
1660 ua_chan->is_sent = 1;
ffe60014 1661
b551a063 1662error:
840cb59c 1663 health_code_update();
b551a063
DG
1664 return ret;
1665}
1666
91d76f53 1667/*
5b4a0ec0 1668 * Create the specified event onto the UST tracer for a UST session.
d0b96690
DG
1669 *
1670 * Should be called with session mutex held.
91d76f53 1671 */
edb67388
DG
1672static
1673int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
1674 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
91d76f53 1675{
5b4a0ec0 1676 int ret = 0;
284d8f55 1677
840cb59c 1678 health_code_update();
86acf0da 1679
5b4a0ec0 1680 /* Create UST event on tracer */
fb45065e 1681 pthread_mutex_lock(&app->sock_lock);
852d0037 1682 ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
5b4a0ec0 1683 &ua_event->obj);
fb45065e 1684 pthread_mutex_unlock(&app->sock_lock);
5b4a0ec0 1685 if (ret < 0) {
ffe60014 1686 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
88e3c2f5 1687 abort();
ffe60014
DG
1688 ERR("Error ustctl create event %s for app pid: %d with ret %d",
1689 ua_event->attr.name, app->pid, ret);
1690 } else {
3757b385
DG
1691 /*
1692 * This is normal behavior, an application can die during the
1693 * creation process. Don't report an error so the execution can
1694 * continue normally.
1695 */
1696 ret = 0;
ffe60014
DG
1697 DBG3("UST app create event failed. Application is dead.");
1698 }
5b4a0ec0 1699 goto error;
91d76f53 1700 }
f6a9efaa 1701
5b4a0ec0 1702 ua_event->handle = ua_event->obj->handle;
284d8f55 1703
5b4a0ec0 1704 DBG2("UST app event %s created successfully for pid:%d",
852d0037 1705 ua_event->attr.name, app->pid);
f6a9efaa 1706
840cb59c 1707 health_code_update();
86acf0da 1708
025faf73
DG
1709 /* Set filter if one is present. */
1710 if (ua_event->filter) {
1711 ret = set_ust_event_filter(ua_event, app);
1712 if (ret < 0) {
1713 goto error;
1714 }
1715 }
1716
7cc9a73c
JI
1717 /* Set exclusions for the event */
1718 if (ua_event->exclusion) {
1719 ret = set_ust_event_exclusion(ua_event, app);
1720 if (ret < 0) {
1721 goto error;
1722 }
1723 }
1724
8535a6d9 1725 /* If event not enabled, disable it on the tracer */
40113787
MD
1726 if (ua_event->enabled) {
1727 /*
1728 * We now need to explicitly enable the event, since it
1729 * is now disabled at creation.
1730 */
1731 ret = enable_ust_event(app, ua_sess, ua_event);
1732 if (ret < 0) {
1733 /*
1734 * If we hit an EPERM, something is wrong with our enable call. If
1735 * we get an EEXIST, there is a problem on the tracer side since we
1736 * just created it.
1737 */
1738 switch (ret) {
1739 case -LTTNG_UST_ERR_PERM:
1740 /* Code flow problem */
1741 assert(0);
1742 case -LTTNG_UST_ERR_EXIST:
1743 /* It's OK for our use case. */
1744 ret = 0;
1745 break;
1746 default:
1747 break;
1748 }
1749 goto error;
1750 }
8535a6d9
DG
1751 }
1752
5b4a0ec0 1753error:
840cb59c 1754 health_code_update();
5b4a0ec0 1755 return ret;
91d76f53 1756}
48842b30 1757
5b4a0ec0
DG
1758/*
1759 * Copy data between an UST app event and a LTT event.
1760 */
421cb601 1761static void shadow_copy_event(struct ust_app_event *ua_event,
48842b30
DG
1762 struct ltt_ust_event *uevent)
1763{
b4ffad32
JI
1764 size_t exclusion_alloc_size;
1765
48842b30
DG
1766 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
1767 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
1768
fc34caaa
DG
1769 ua_event->enabled = uevent->enabled;
1770
5b4a0ec0
DG
1771 /* Copy event attributes */
1772 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
1773
53a80697
MD
1774 /* Copy filter bytecode */
1775 if (uevent->filter) {
51755dc8 1776 ua_event->filter = copy_filter_bytecode(uevent->filter);
025faf73 1777 /* Filter might be NULL here in case of ENONEM. */
53a80697 1778 }
b4ffad32
JI
1779
1780 /* Copy exclusion data */
1781 if (uevent->exclusion) {
51755dc8 1782 exclusion_alloc_size = sizeof(struct lttng_event_exclusion) +
b4ffad32
JI
1783 LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count;
1784 ua_event->exclusion = zmalloc(exclusion_alloc_size);
5f8df26c
JI
1785 if (ua_event->exclusion == NULL) {
1786 PERROR("malloc");
1787 } else {
1788 memcpy(ua_event->exclusion, uevent->exclusion,
1789 exclusion_alloc_size);
b4ffad32
JI
1790 }
1791 }
48842b30
DG
1792}
1793
5b4a0ec0
DG
1794/*
1795 * Copy data between an UST app channel and a LTT channel.
1796 */
421cb601 1797static void shadow_copy_channel(struct ust_app_channel *ua_chan,
48842b30
DG
1798 struct ltt_ust_channel *uchan)
1799{
fc34caaa 1800 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
48842b30
DG
1801
1802 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
1803 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
ffe60014 1804
1624d5b7
JD
1805 ua_chan->tracefile_size = uchan->tracefile_size;
1806 ua_chan->tracefile_count = uchan->tracefile_count;
1807
ffe60014
DG
1808 /* Copy event attributes since the layout is different. */
1809 ua_chan->attr.subbuf_size = uchan->attr.subbuf_size;
1810 ua_chan->attr.num_subbuf = uchan->attr.num_subbuf;
1811 ua_chan->attr.overwrite = uchan->attr.overwrite;
1812 ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval;
1813 ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval;
e9404c27 1814 ua_chan->monitor_timer_interval = uchan->monitor_timer_interval;
ffe60014 1815 ua_chan->attr.output = uchan->attr.output;
491d1539
MD
1816 ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout;
1817
ffe60014
DG
1818 /*
1819 * Note that the attribute channel type is not set since the channel on the
1820 * tracing registry side does not have this information.
1821 */
48842b30 1822
fc34caaa 1823 ua_chan->enabled = uchan->enabled;
7972aab2 1824 ua_chan->tracing_channel_id = uchan->id;
fc34caaa 1825
fc34caaa 1826 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
48842b30
DG
1827}
1828
5b4a0ec0
DG
1829/*
1830 * Copy data between a UST app session and a regular LTT session.
1831 */
421cb601 1832static void shadow_copy_session(struct ust_app_session *ua_sess,
bec39940 1833 struct ltt_ust_session *usess, struct ust_app *app)
48842b30 1834{
477d7741
MD
1835 struct tm *timeinfo;
1836 char datetime[16];
1837 int ret;
d7ba1388 1838 char tmp_shm_path[PATH_MAX];
477d7741 1839
940c4592 1840 timeinfo = localtime(&app->registration_time);
477d7741 1841 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
48842b30 1842
421cb601 1843 DBG2("Shadow copy of session handle %d", ua_sess->handle);
48842b30 1844
7972aab2
DG
1845 ua_sess->tracing_id = usess->id;
1846 ua_sess->id = get_next_session_id();
470cc211
JG
1847 ua_sess->real_credentials.uid = app->uid;
1848 ua_sess->real_credentials.gid = app->gid;
1849 ua_sess->effective_credentials.uid = usess->uid;
1850 ua_sess->effective_credentials.gid = usess->gid;
7972aab2
DG
1851 ua_sess->buffer_type = usess->buffer_type;
1852 ua_sess->bits_per_long = app->bits_per_long;
6addfa37 1853
7972aab2 1854 /* There is only one consumer object per session possible. */
6addfa37 1855 consumer_output_get(usess->consumer);
7972aab2 1856 ua_sess->consumer = usess->consumer;
6addfa37 1857
2bba9e53 1858 ua_sess->output_traces = usess->output_traces;
ecc48a90 1859 ua_sess->live_timer_interval = usess->live_timer_interval;
84ad93e8
DG
1860 copy_channel_attr_to_ustctl(&ua_sess->metadata_attr,
1861 &usess->metadata_attr);
7972aab2
DG
1862
1863 switch (ua_sess->buffer_type) {
1864 case LTTNG_BUFFER_PER_PID:
1865 ret = snprintf(ua_sess->path, sizeof(ua_sess->path),
dec56f6c 1866 DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid,
7972aab2
DG
1867 datetime);
1868 break;
1869 case LTTNG_BUFFER_PER_UID:
1870 ret = snprintf(ua_sess->path, sizeof(ua_sess->path),
470cc211
JG
1871 DEFAULT_UST_TRACE_UID_PATH,
1872 ua_sess->real_credentials.uid,
1873 app->bits_per_long);
7972aab2
DG
1874 break;
1875 default:
1876 assert(0);
1877 goto error;
1878 }
477d7741
MD
1879 if (ret < 0) {
1880 PERROR("asprintf UST shadow copy session");
477d7741 1881 assert(0);
7972aab2 1882 goto error;
477d7741
MD
1883 }
1884
3d071855
MD
1885 strncpy(ua_sess->root_shm_path, usess->root_shm_path,
1886 sizeof(ua_sess->root_shm_path));
1887 ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0';
d7ba1388
MD
1888 strncpy(ua_sess->shm_path, usess->shm_path,
1889 sizeof(ua_sess->shm_path));
1890 ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0';
1891 if (ua_sess->shm_path[0]) {
1892 switch (ua_sess->buffer_type) {
1893 case LTTNG_BUFFER_PER_PID:
1894 ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path),
1895 DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s",
1896 app->name, app->pid, datetime);
1897 break;
1898 case LTTNG_BUFFER_PER_UID:
1899 ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path),
1900 DEFAULT_UST_TRACE_UID_PATH,
1901 app->uid, app->bits_per_long);
1902 break;
1903 default:
1904 assert(0);
1905 goto error;
1906 }
1907 if (ret < 0) {
1908 PERROR("sprintf UST shadow copy session");
1909 assert(0);
1910 goto error;
1911 }
1912 strncat(ua_sess->shm_path, tmp_shm_path,
1913 sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1);
1914 ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0';
1915 }
6addfa37 1916 return;
7972aab2
DG
1917
1918error:
6addfa37 1919 consumer_output_put(ua_sess->consumer);
48842b30
DG
1920}
1921
78f0bacd
DG
1922/*
1923 * Lookup sesison wrapper.
1924 */
84cd17c6 1925static
fb9a95c4 1926void __lookup_session_by_app(const struct ltt_ust_session *usess,
bec39940 1927 struct ust_app *app, struct lttng_ht_iter *iter)
84cd17c6
MD
1928{
1929 /* Get right UST app session from app */
d9bf3ca4 1930 lttng_ht_lookup(app->sessions, &usess->id, iter);
84cd17c6
MD
1931}
1932
421cb601
DG
1933/*
1934 * Return ust app session from the app session hashtable using the UST session
a991f516 1935 * id.
421cb601 1936 */
48842b30 1937static struct ust_app_session *lookup_session_by_app(
fb9a95c4 1938 const struct ltt_ust_session *usess, struct ust_app *app)
48842b30 1939{
bec39940 1940 struct lttng_ht_iter iter;
d9bf3ca4 1941 struct lttng_ht_node_u64 *node;
48842b30 1942
84cd17c6 1943 __lookup_session_by_app(usess, app, &iter);
d9bf3ca4 1944 node = lttng_ht_iter_get_node_u64(&iter);
48842b30
DG
1945 if (node == NULL) {
1946 goto error;
1947 }
1948
1949 return caa_container_of(node, struct ust_app_session, node);
1950
1951error:
1952 return NULL;
1953}
1954
7972aab2
DG
1955/*
1956 * Setup buffer registry per PID for the given session and application. If none
1957 * is found, a new one is created, added to the global registry and
1958 * initialized. If regp is valid, it's set with the newly created object.
1959 *
1960 * Return 0 on success or else a negative value.
1961 */
1962static int setup_buffer_reg_pid(struct ust_app_session *ua_sess,
1963 struct ust_app *app, struct buffer_reg_pid **regp)
1964{
1965 int ret = 0;
1966 struct buffer_reg_pid *reg_pid;
1967
1968 assert(ua_sess);
1969 assert(app);
1970
1971 rcu_read_lock();
1972
1973 reg_pid = buffer_reg_pid_find(ua_sess->id);
1974 if (!reg_pid) {
1975 /*
1976 * This is the create channel path meaning that if there is NO
1977 * registry available, we have to create one for this session.
1978 */
d7ba1388 1979 ret = buffer_reg_pid_create(ua_sess->id, &reg_pid,
3d071855 1980 ua_sess->root_shm_path, ua_sess->shm_path);
7972aab2
DG
1981 if (ret < 0) {
1982 goto error;
1983 }
7972aab2
DG
1984 } else {
1985 goto end;
1986 }
1987
1988 /* Initialize registry. */
1989 ret = ust_registry_session_init(&reg_pid->registry->reg.ust, app,
1990 app->bits_per_long, app->uint8_t_alignment,
1991 app->uint16_t_alignment, app->uint32_t_alignment,
af6142cf 1992 app->uint64_t_alignment, app->long_alignment,
470cc211
JG
1993 app->byte_order, app->version.major, app->version.minor,
1994 reg_pid->root_shm_path, reg_pid->shm_path,
1995 ua_sess->effective_credentials.uid,
8de88061
JR
1996 ua_sess->effective_credentials.gid, ua_sess->tracing_id,
1997 app->uid);
7972aab2 1998 if (ret < 0) {
286c991a
MD
1999 /*
2000 * reg_pid->registry->reg.ust is NULL upon error, so we need to
2001 * destroy the buffer registry, because it is always expected
2002 * that if the buffer registry can be found, its ust registry is
2003 * non-NULL.
2004 */
2005 buffer_reg_pid_destroy(reg_pid);
7972aab2
DG
2006 goto error;
2007 }
2008
286c991a
MD
2009 buffer_reg_pid_add(reg_pid);
2010
7972aab2
DG
2011 DBG3("UST app buffer registry per PID created successfully");
2012
2013end:
2014 if (regp) {
2015 *regp = reg_pid;
2016 }
2017error:
2018 rcu_read_unlock();
2019 return ret;
2020}
2021
2022/*
2023 * Setup buffer registry per UID for the given session and application. If none
2024 * is found, a new one is created, added to the global registry and
2025 * initialized. If regp is valid, it's set with the newly created object.
2026 *
2027 * Return 0 on success or else a negative value.
2028 */
2029static int setup_buffer_reg_uid(struct ltt_ust_session *usess,
d7ba1388 2030 struct ust_app_session *ua_sess,
7972aab2
DG
2031 struct ust_app *app, struct buffer_reg_uid **regp)
2032{
2033 int ret = 0;
2034 struct buffer_reg_uid *reg_uid;
2035
2036 assert(usess);
2037 assert(app);
2038
2039 rcu_read_lock();
2040
2041 reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid);
2042 if (!reg_uid) {
2043 /*
2044 * This is the create channel path meaning that if there is NO
2045 * registry available, we have to create one for this session.
2046 */
2047 ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid,
3d071855
MD
2048 LTTNG_DOMAIN_UST, &reg_uid,
2049 ua_sess->root_shm_path, ua_sess->shm_path);
7972aab2
DG
2050 if (ret < 0) {
2051 goto error;
2052 }
7972aab2
DG
2053 } else {
2054 goto end;
2055 }
2056
2057 /* Initialize registry. */
af6142cf 2058 ret = ust_registry_session_init(&reg_uid->registry->reg.ust, NULL,
7972aab2
DG
2059 app->bits_per_long, app->uint8_t_alignment,
2060 app->uint16_t_alignment, app->uint32_t_alignment,
af6142cf
MD
2061 app->uint64_t_alignment, app->long_alignment,
2062 app->byte_order, app->version.major,
3d071855 2063 app->version.minor, reg_uid->root_shm_path,
8de88061
JR
2064 reg_uid->shm_path, usess->uid, usess->gid,
2065 ua_sess->tracing_id, app->uid);
7972aab2 2066 if (ret < 0) {
286c991a
MD
2067 /*
2068 * reg_uid->registry->reg.ust is NULL upon error, so we need to
2069 * destroy the buffer registry, because it is always expected
2070 * that if the buffer registry can be found, its ust registry is
2071 * non-NULL.
2072 */
2073 buffer_reg_uid_destroy(reg_uid, NULL);
7972aab2
DG
2074 goto error;
2075 }
2076 /* Add node to teardown list of the session. */
2077 cds_list_add(&reg_uid->lnode, &usess->buffer_reg_uid_list);
2078
286c991a 2079 buffer_reg_uid_add(reg_uid);
7972aab2 2080
286c991a 2081 DBG3("UST app buffer registry per UID created successfully");
7972aab2
DG
2082end:
2083 if (regp) {
2084 *regp = reg_uid;
2085 }
2086error:
2087 rcu_read_unlock();
2088 return ret;
2089}
2090
421cb601 2091/*
3d8ca23b 2092 * Create a session on the tracer side for the given app.
421cb601 2093 *
3d8ca23b
DG
2094 * On success, ua_sess_ptr is populated with the session pointer or else left
2095 * untouched. If the session was created, is_created is set to 1. On error,
2096 * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can
2097 * be NULL.
2098 *
2099 * Returns 0 on success or else a negative code which is either -ENOMEM or
2100 * -ENOTCONN which is the default code if the ustctl_create_session fails.
421cb601 2101 */
03f91eaa 2102static int find_or_create_ust_app_session(struct ltt_ust_session *usess,
3d8ca23b
DG
2103 struct ust_app *app, struct ust_app_session **ua_sess_ptr,
2104 int *is_created)
421cb601 2105{
3d8ca23b 2106 int ret, created = 0;
421cb601
DG
2107 struct ust_app_session *ua_sess;
2108
3d8ca23b
DG
2109 assert(usess);
2110 assert(app);
2111 assert(ua_sess_ptr);
2112
840cb59c 2113 health_code_update();
86acf0da 2114
421cb601
DG
2115 ua_sess = lookup_session_by_app(usess, app);
2116 if (ua_sess == NULL) {
d9bf3ca4 2117 DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it",
852d0037 2118 app->pid, usess->id);
40bbd087 2119 ua_sess = alloc_ust_app_session();
421cb601
DG
2120 if (ua_sess == NULL) {
2121 /* Only malloc can failed so something is really wrong */
3d8ca23b
DG
2122 ret = -ENOMEM;
2123 goto error;
421cb601 2124 }
477d7741 2125 shadow_copy_session(ua_sess, usess, app);
3d8ca23b 2126 created = 1;
421cb601
DG
2127 }
2128
7972aab2
DG
2129 switch (usess->buffer_type) {
2130 case LTTNG_BUFFER_PER_PID:
2131 /* Init local registry. */
2132 ret = setup_buffer_reg_pid(ua_sess, app, NULL);
421cb601 2133 if (ret < 0) {
e64207cf 2134 delete_ust_app_session(-1, ua_sess, app);
7972aab2
DG
2135 goto error;
2136 }
2137 break;
2138 case LTTNG_BUFFER_PER_UID:
2139 /* Look for a global registry. If none exists, create one. */
d7ba1388 2140 ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL);
7972aab2 2141 if (ret < 0) {
e64207cf 2142 delete_ust_app_session(-1, ua_sess, app);
7972aab2
DG
2143 goto error;
2144 }
2145 break;
2146 default:
2147 assert(0);
2148 ret = -EINVAL;
2149 goto error;
2150 }
2151
2152 health_code_update();
2153
2154 if (ua_sess->handle == -1) {
fb45065e 2155 pthread_mutex_lock(&app->sock_lock);
7972aab2 2156 ret = ustctl_create_session(app->sock);
fb45065e 2157 pthread_mutex_unlock(&app->sock_lock);
7972aab2
DG
2158 if (ret < 0) {
2159 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
2160 ERR("Creating session for app pid %d with ret %d",
ffe60014
DG
2161 app->pid, ret);
2162 } else {
2163 DBG("UST app creating session failed. Application is dead");
3757b385
DG
2164 /*
2165 * This is normal behavior, an application can die during the
2166 * creation process. Don't report an error so the execution can
2167 * continue normally. This will get flagged ENOTCONN and the
2168 * caller will handle it.
2169 */
2170 ret = 0;
ffe60014 2171 }
d0b96690 2172 delete_ust_app_session(-1, ua_sess, app);
3d8ca23b
DG
2173 if (ret != -ENOMEM) {
2174 /*
2175 * Tracer is probably gone or got an internal error so let's
2176 * behave like it will soon unregister or not usable.
2177 */
2178 ret = -ENOTCONN;
2179 }
2180 goto error;
421cb601
DG
2181 }
2182
7972aab2
DG
2183 ua_sess->handle = ret;
2184
2185 /* Add ust app session to app's HT */
d9bf3ca4
MD
2186 lttng_ht_node_init_u64(&ua_sess->node,
2187 ua_sess->tracing_id);
2188 lttng_ht_add_unique_u64(app->sessions, &ua_sess->node);
10b56aef
MD
2189 lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle);
2190 lttng_ht_add_unique_ulong(app->ust_sessions_objd,
2191 &ua_sess->ust_objd_node);
7972aab2
DG
2192
2193 DBG2("UST app session created successfully with handle %d", ret);
2194 }
2195
2196 *ua_sess_ptr = ua_sess;
2197 if (is_created) {
2198 *is_created = created;
2199 }
2200
2201 /* Everything went well. */
2202 ret = 0;
2203
2204error:
2205 health_code_update();
2206 return ret;
2207}
2208
6a6b2068
JG
2209/*
2210 * Match function for a hash table lookup of ust_app_ctx.
2211 *
2212 * It matches an ust app context based on the context type and, in the case
2213 * of perf counters, their name.
2214 */
2215static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key)
2216{
2217 struct ust_app_ctx *ctx;
bdf64013 2218 const struct lttng_ust_context_attr *key;
6a6b2068
JG
2219
2220 assert(node);
2221 assert(_key);
2222
2223 ctx = caa_container_of(node, struct ust_app_ctx, node.node);
2224 key = _key;
2225
2226 /* Context type */
2227 if (ctx->ctx.ctx != key->ctx) {
2228 goto no_match;
2229 }
2230
bdf64013
JG
2231 switch(key->ctx) {
2232 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER:
6a6b2068 2233 if (strncmp(key->u.perf_counter.name,
bdf64013
JG
2234 ctx->ctx.u.perf_counter.name,
2235 sizeof(key->u.perf_counter.name))) {
2236 goto no_match;
2237 }
2238 break;
2239 case LTTNG_UST_CONTEXT_APP_CONTEXT:
2240 if (strcmp(key->u.app_ctx.provider_name,
2241 ctx->ctx.u.app_ctx.provider_name) ||
2242 strcmp(key->u.app_ctx.ctx_name,
2243 ctx->ctx.u.app_ctx.ctx_name)) {
6a6b2068
JG
2244 goto no_match;
2245 }
bdf64013
JG
2246 break;
2247 default:
2248 break;
6a6b2068
JG
2249 }
2250
2251 /* Match. */
2252 return 1;
2253
2254no_match:
2255 return 0;
2256}
2257
2258/*
2259 * Lookup for an ust app context from an lttng_ust_context.
2260 *
be184a0f 2261 * Must be called while holding RCU read side lock.
6a6b2068
JG
2262 * Return an ust_app_ctx object or NULL on error.
2263 */
2264static
2265struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht,
bdf64013 2266 struct lttng_ust_context_attr *uctx)
6a6b2068
JG
2267{
2268 struct lttng_ht_iter iter;
2269 struct lttng_ht_node_ulong *node;
2270 struct ust_app_ctx *app_ctx = NULL;
2271
2272 assert(uctx);
2273 assert(ht);
2274
2275 /* Lookup using the lttng_ust_context_type and a custom match fct. */
2276 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed),
2277 ht_match_ust_app_ctx, uctx, &iter.iter);
2278 node = lttng_ht_iter_get_node_ulong(&iter);
2279 if (!node) {
2280 goto end;
2281 }
2282
2283 app_ctx = caa_container_of(node, struct ust_app_ctx, node);
2284
2285end:
2286 return app_ctx;
2287}
2288
7972aab2
DG
2289/*
2290 * Create a context for the channel on the tracer.
2291 *
2292 * Called with UST app session lock held and a RCU read side lock.
2293 */
2294static
c9edf082 2295int create_ust_app_channel_context(struct ust_app_channel *ua_chan,
bdf64013 2296 struct lttng_ust_context_attr *uctx,
7972aab2
DG
2297 struct ust_app *app)
2298{
2299 int ret = 0;
7972aab2
DG
2300 struct ust_app_ctx *ua_ctx;
2301
2302 DBG2("UST app adding context to channel %s", ua_chan->name);
2303
6a6b2068
JG
2304 ua_ctx = find_ust_app_context(ua_chan->ctx, uctx);
2305 if (ua_ctx) {
7972aab2
DG
2306 ret = -EEXIST;
2307 goto error;
2308 }
2309
2310 ua_ctx = alloc_ust_app_ctx(uctx);
2311 if (ua_ctx == NULL) {
2312 /* malloc failed */
7682f304 2313 ret = -ENOMEM;
7972aab2
DG
2314 goto error;
2315 }
2316
2317 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
aa3514e9 2318 lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node);
31746f93 2319 cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list);
7972aab2
DG
2320
2321 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2322 if (ret < 0) {
2323 goto error;
2324 }
2325
2326error:
2327 return ret;
2328}
2329
2330/*
2331 * Enable on the tracer side a ust app event for the session and channel.
2332 *
2333 * Called with UST app session lock held.
2334 */
2335static
2336int enable_ust_app_event(struct ust_app_session *ua_sess,
2337 struct ust_app_event *ua_event, struct ust_app *app)
2338{
2339 int ret;
2340
2341 ret = enable_ust_event(app, ua_sess, ua_event);
2342 if (ret < 0) {
2343 goto error;
2344 }
2345
2346 ua_event->enabled = 1;
2347
2348error:
2349 return ret;
2350}
2351
2352/*
2353 * Disable on the tracer side a ust app event for the session and channel.
2354 */
2355static int disable_ust_app_event(struct ust_app_session *ua_sess,
2356 struct ust_app_event *ua_event, struct ust_app *app)
2357{
2358 int ret;
2359
2360 ret = disable_ust_event(app, ua_sess, ua_event);
2361 if (ret < 0) {
2362 goto error;
2363 }
2364
2365 ua_event->enabled = 0;
2366
2367error:
2368 return ret;
2369}
2370
2371/*
2372 * Lookup ust app channel for session and disable it on the tracer side.
2373 */
2374static
2375int disable_ust_app_channel(struct ust_app_session *ua_sess,
2376 struct ust_app_channel *ua_chan, struct ust_app *app)
2377{
2378 int ret;
2379
2380 ret = disable_ust_channel(app, ua_sess, ua_chan);
2381 if (ret < 0) {
2382 goto error;
2383 }
2384
2385 ua_chan->enabled = 0;
2386
2387error:
2388 return ret;
2389}
2390
2391/*
2392 * Lookup ust app channel for session and enable it on the tracer side. This
2393 * MUST be called with a RCU read side lock acquired.
2394 */
2395static int enable_ust_app_channel(struct ust_app_session *ua_sess,
2396 struct ltt_ust_channel *uchan, struct ust_app *app)
2397{
2398 int ret = 0;
2399 struct lttng_ht_iter iter;
2400 struct lttng_ht_node_str *ua_chan_node;
2401 struct ust_app_channel *ua_chan;
2402
2403 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2404 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2405 if (ua_chan_node == NULL) {
d9bf3ca4 2406 DBG2("Unable to find channel %s in ust session id %" PRIu64,
7972aab2
DG
2407 uchan->name, ua_sess->tracing_id);
2408 goto error;
2409 }
2410
2411 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2412
2413 ret = enable_ust_channel(app, ua_sess, ua_chan);
2414 if (ret < 0) {
2415 goto error;
2416 }
2417
2418error:
2419 return ret;
2420}
2421
2422/*
2423 * Ask the consumer to create a channel and get it if successful.
2424 *
fad1ed2f
JR
2425 * Called with UST app session lock held.
2426 *
7972aab2
DG
2427 * Return 0 on success or else a negative value.
2428 */
2429static int do_consumer_create_channel(struct ltt_ust_session *usess,
2430 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan,
e098433c
JG
2431 int bitness, struct ust_registry_session *registry,
2432 uint64_t trace_archive_id)
7972aab2
DG
2433{
2434 int ret;
2435 unsigned int nb_fd = 0;
2436 struct consumer_socket *socket;
2437
2438 assert(usess);
2439 assert(ua_sess);
2440 assert(ua_chan);
2441 assert(registry);
2442
2443 rcu_read_lock();
2444 health_code_update();
2445
2446 /* Get the right consumer socket for the application. */
2447 socket = consumer_find_socket_by_bitness(bitness, usess->consumer);
2448 if (!socket) {
2449 ret = -EINVAL;
2450 goto error;
2451 }
2452
2453 health_code_update();
2454
2455 /* Need one fd for the channel. */
2456 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2457 if (ret < 0) {
2458 ERR("Exhausted number of available FD upon create channel");
2459 goto error;
2460 }
2461
2462 /*
2463 * Ask consumer to create channel. The consumer will return the number of
2464 * stream we have to expect.
2465 */
2466 ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket,
d2956687 2467 registry, usess->current_trace_chunk);
7972aab2
DG
2468 if (ret < 0) {
2469 goto error_ask;
2470 }
2471
2472 /*
2473 * Compute the number of fd needed before receiving them. It must be 2 per
2474 * stream (2 being the default value here).
2475 */
2476 nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count;
2477
2478 /* Reserve the amount of file descriptor we need. */
2479 ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd);
2480 if (ret < 0) {
2481 ERR("Exhausted number of available FD upon create channel");
2482 goto error_fd_get_stream;
2483 }
2484
2485 health_code_update();
2486
2487 /*
2488 * Now get the channel from the consumer. This call wil populate the stream
2489 * list of that channel and set the ust objects.
2490 */
d9078d0c
DG
2491 if (usess->consumer->enabled) {
2492 ret = ust_consumer_get_channel(socket, ua_chan);
2493 if (ret < 0) {
2494 goto error_destroy;
2495 }
7972aab2
DG
2496 }
2497
2498 rcu_read_unlock();
2499 return 0;
2500
2501error_destroy:
2502 lttng_fd_put(LTTNG_FD_APPS, nb_fd);
2503error_fd_get_stream:
2504 /*
2505 * Initiate a destroy channel on the consumer since we had an error
2506 * handling it on our side. The return value is of no importance since we
2507 * already have a ret value set by the previous error that we need to
2508 * return.
2509 */
2510 (void) ust_consumer_destroy_channel(socket, ua_chan);
2511error_ask:
2512 lttng_fd_put(LTTNG_FD_APPS, 1);
2513error:
2514 health_code_update();
2515 rcu_read_unlock();
2516 return ret;
2517}
2518
2519/*
2520 * Duplicate the ust data object of the ust app stream and save it in the
2521 * buffer registry stream.
2522 *
2523 * Return 0 on success or else a negative value.
2524 */
2525static int duplicate_stream_object(struct buffer_reg_stream *reg_stream,
2526 struct ust_app_stream *stream)
2527{
2528 int ret;
2529
2530 assert(reg_stream);
2531 assert(stream);
2532
2533 /* Reserve the amount of file descriptor we need. */
2534 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2535 if (ret < 0) {
2536 ERR("Exhausted number of available FD upon duplicate stream");
2537 goto error;
2538 }
2539
2540 /* Duplicate object for stream once the original is in the registry. */
2541 ret = ustctl_duplicate_ust_object_data(&stream->obj,
2542 reg_stream->obj.ust);
2543 if (ret < 0) {
2544 ERR("Duplicate stream obj from %p to %p failed with ret %d",
2545 reg_stream->obj.ust, stream->obj, ret);
2546 lttng_fd_put(LTTNG_FD_APPS, 2);
2547 goto error;
2548 }
2549 stream->handle = stream->obj->handle;
2550
2551error:
2552 return ret;
2553}
2554
2555/*
2556 * Duplicate the ust data object of the ust app. channel and save it in the
2557 * buffer registry channel.
2558 *
2559 * Return 0 on success or else a negative value.
2560 */
2561static int duplicate_channel_object(struct buffer_reg_channel *reg_chan,
2562 struct ust_app_channel *ua_chan)
2563{
2564 int ret;
2565
2566 assert(reg_chan);
2567 assert(ua_chan);
2568
2569 /* Need two fds for the channel. */
2570 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2571 if (ret < 0) {
2572 ERR("Exhausted number of available FD upon duplicate channel");
2573 goto error_fd_get;
2574 }
2575
2576 /* Duplicate object for stream once the original is in the registry. */
2577 ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust);
2578 if (ret < 0) {
2579 ERR("Duplicate channel obj from %p to %p failed with ret: %d",
2580 reg_chan->obj.ust, ua_chan->obj, ret);
2581 goto error;
2582 }
2583 ua_chan->handle = ua_chan->obj->handle;
2584
2585 return 0;
2586
2587error:
2588 lttng_fd_put(LTTNG_FD_APPS, 1);
2589error_fd_get:
2590 return ret;
2591}
2592
2593/*
2594 * For a given channel buffer registry, setup all streams of the given ust
2595 * application channel.
2596 *
2597 * Return 0 on success or else a negative value.
2598 */
2599static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan,
fb45065e
MD
2600 struct ust_app_channel *ua_chan,
2601 struct ust_app *app)
7972aab2
DG
2602{
2603 int ret = 0;
2604 struct ust_app_stream *stream, *stmp;
2605
2606 assert(reg_chan);
2607 assert(ua_chan);
2608
2609 DBG2("UST app setup buffer registry stream");
2610
2611 /* Send all streams to application. */
2612 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
2613 struct buffer_reg_stream *reg_stream;
2614
2615 ret = buffer_reg_stream_create(&reg_stream);
2616 if (ret < 0) {
2617 goto error;
2618 }
2619
2620 /*
2621 * Keep original pointer and nullify it in the stream so the delete
2622 * stream call does not release the object.
2623 */
2624 reg_stream->obj.ust = stream->obj;
2625 stream->obj = NULL;
2626 buffer_reg_stream_add(reg_stream, reg_chan);
421cb601 2627
7972aab2
DG
2628 /* We don't need the streams anymore. */
2629 cds_list_del(&stream->list);
fb45065e 2630 delete_ust_app_stream(-1, stream, app);
7972aab2 2631 }
421cb601 2632
7972aab2
DG
2633error:
2634 return ret;
2635}
2636
2637/*
2638 * Create a buffer registry channel for the given session registry and
2639 * application channel object. If regp pointer is valid, it's set with the
2640 * created object. Important, the created object is NOT added to the session
2641 * registry hash table.
2642 *
2643 * Return 0 on success else a negative value.
2644 */
2645static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess,
2646 struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp)
2647{
2648 int ret;
2649 struct buffer_reg_channel *reg_chan = NULL;
2650
2651 assert(reg_sess);
2652 assert(ua_chan);
2653
2654 DBG2("UST app creating buffer registry channel for %s", ua_chan->name);
2655
2656 /* Create buffer registry channel. */
2657 ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, &reg_chan);
2658 if (ret < 0) {
2659 goto error_create;
421cb601 2660 }
7972aab2
DG
2661 assert(reg_chan);
2662 reg_chan->consumer_key = ua_chan->key;
8c924c7b 2663 reg_chan->subbuf_size = ua_chan->attr.subbuf_size;
d07ceecd 2664 reg_chan->num_subbuf = ua_chan->attr.num_subbuf;
421cb601 2665
7972aab2
DG
2666 /* Create and add a channel registry to session. */
2667 ret = ust_registry_channel_add(reg_sess->reg.ust,
2668 ua_chan->tracing_channel_id);
2669 if (ret < 0) {
2670 goto error;
d88aee68 2671 }
7972aab2 2672 buffer_reg_channel_add(reg_sess, reg_chan);
d88aee68 2673
7972aab2
DG
2674 if (regp) {
2675 *regp = reg_chan;
3d8ca23b 2676 }
d88aee68 2677
7972aab2 2678 return 0;
3d8ca23b
DG
2679
2680error:
7972aab2
DG
2681 /* Safe because the registry channel object was not added to any HT. */
2682 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
2683error_create:
3d8ca23b 2684 return ret;
421cb601
DG
2685}
2686
55cc08a6 2687/*
7972aab2
DG
2688 * Setup buffer registry channel for the given session registry and application
2689 * channel object. If regp pointer is valid, it's set with the created object.
d0b96690 2690 *
7972aab2 2691 * Return 0 on success else a negative value.
55cc08a6 2692 */
7972aab2 2693static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess,
fb45065e
MD
2694 struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan,
2695 struct ust_app *app)
55cc08a6 2696{
7972aab2 2697 int ret;
55cc08a6 2698
7972aab2
DG
2699 assert(reg_sess);
2700 assert(reg_chan);
2701 assert(ua_chan);
2702 assert(ua_chan->obj);
55cc08a6 2703
7972aab2 2704 DBG2("UST app setup buffer registry channel for %s", ua_chan->name);
55cc08a6 2705
7972aab2 2706 /* Setup all streams for the registry. */
fb45065e 2707 ret = setup_buffer_reg_streams(reg_chan, ua_chan, app);
7972aab2 2708 if (ret < 0) {
55cc08a6
DG
2709 goto error;
2710 }
2711
7972aab2
DG
2712 reg_chan->obj.ust = ua_chan->obj;
2713 ua_chan->obj = NULL;
55cc08a6 2714
7972aab2 2715 return 0;
55cc08a6
DG
2716
2717error:
7972aab2
DG
2718 buffer_reg_channel_remove(reg_sess, reg_chan);
2719 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
55cc08a6
DG
2720 return ret;
2721}
2722
edb67388 2723/*
7972aab2 2724 * Send buffer registry channel to the application.
d0b96690 2725 *
7972aab2 2726 * Return 0 on success else a negative value.
edb67388 2727 */
7972aab2
DG
2728static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan,
2729 struct ust_app *app, struct ust_app_session *ua_sess,
2730 struct ust_app_channel *ua_chan)
edb67388
DG
2731{
2732 int ret;
7972aab2 2733 struct buffer_reg_stream *reg_stream;
edb67388 2734
7972aab2
DG
2735 assert(reg_chan);
2736 assert(app);
2737 assert(ua_sess);
2738 assert(ua_chan);
2739
2740 DBG("UST app sending buffer registry channel to ust sock %d", app->sock);
2741
2742 ret = duplicate_channel_object(reg_chan, ua_chan);
edb67388
DG
2743 if (ret < 0) {
2744 goto error;
2745 }
2746
7972aab2
DG
2747 /* Send channel to the application. */
2748 ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
a7169585
MD
2749 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
2750 ret = -ENOTCONN; /* Caused by app exiting. */
2751 goto error;
2752 } else if (ret < 0) {
7972aab2
DG
2753 goto error;
2754 }
2755
2756 health_code_update();
2757
2758 /* Send all streams to application. */
2759 pthread_mutex_lock(&reg_chan->stream_list_lock);
2760 cds_list_for_each_entry(reg_stream, &reg_chan->streams, lnode) {
2761 struct ust_app_stream stream;
2762
2763 ret = duplicate_stream_object(reg_stream, &stream);
2764 if (ret < 0) {
2765 goto error_stream_unlock;
2766 }
2767
2768 ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream);
2769 if (ret < 0) {
fb45065e 2770 (void) release_ust_app_stream(-1, &stream, app);
a7169585
MD
2771 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
2772 ret = -ENOTCONN; /* Caused by app exiting. */
a7169585 2773 }
7972aab2
DG
2774 goto error_stream_unlock;
2775 }
edb67388 2776
7972aab2
DG
2777 /*
2778 * The return value is not important here. This function will output an
2779 * error if needed.
2780 */
fb45065e 2781 (void) release_ust_app_stream(-1, &stream, app);
7972aab2
DG
2782 }
2783 ua_chan->is_sent = 1;
2784
2785error_stream_unlock:
2786 pthread_mutex_unlock(&reg_chan->stream_list_lock);
edb67388
DG
2787error:
2788 return ret;
2789}
2790
9730260e 2791/*
7972aab2
DG
2792 * Create and send to the application the created buffers with per UID buffers.
2793 *
9acdc1d6 2794 * This MUST be called with a RCU read side lock acquired.
71e0a100 2795 * The session list lock and the session's lock must be acquired.
9acdc1d6 2796 *
7972aab2 2797 * Return 0 on success else a negative value.
9730260e 2798 */
7972aab2
DG
2799static int create_channel_per_uid(struct ust_app *app,
2800 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2801 struct ust_app_channel *ua_chan)
9730260e
DG
2802{
2803 int ret;
7972aab2
DG
2804 struct buffer_reg_uid *reg_uid;
2805 struct buffer_reg_channel *reg_chan;
e32d7f27 2806 struct ltt_session *session = NULL;
e098433c
JG
2807 enum lttng_error_code notification_ret;
2808 struct ust_registry_channel *chan_reg;
9730260e 2809
7972aab2
DG
2810 assert(app);
2811 assert(usess);
2812 assert(ua_sess);
2813 assert(ua_chan);
2814
2815 DBG("UST app creating channel %s with per UID buffers", ua_chan->name);
2816
2817 reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid);
2818 /*
2819 * The session creation handles the creation of this global registry
2820 * object. If none can be find, there is a code flow problem or a
2821 * teardown race.
2822 */
2823 assert(reg_uid);
2824
2825 reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id,
2826 reg_uid);
2721f7ea
JG
2827 if (reg_chan) {
2828 goto send_channel;
2829 }
7972aab2 2830
2721f7ea
JG
2831 /* Create the buffer registry channel object. */
2832 ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, &reg_chan);
2833 if (ret < 0) {
2834 ERR("Error creating the UST channel \"%s\" registry instance",
f14256d6 2835 ua_chan->name);
2721f7ea
JG
2836 goto error;
2837 }
f14256d6 2838
e098433c
JG
2839 session = session_find_by_id(ua_sess->tracing_id);
2840 assert(session);
2841 assert(pthread_mutex_trylock(&session->lock));
2842 assert(session_trylock_list());
2843
2721f7ea
JG
2844 /*
2845 * Create the buffers on the consumer side. This call populates the
2846 * ust app channel object with all streams and data object.
2847 */
2848 ret = do_consumer_create_channel(usess, ua_sess, ua_chan,
e098433c 2849 app->bits_per_long, reg_uid->registry->reg.ust,
d2956687 2850 session->most_recent_chunk_id.value);
2721f7ea
JG
2851 if (ret < 0) {
2852 ERR("Error creating UST channel \"%s\" on the consumer daemon",
2853 ua_chan->name);
7972aab2
DG
2854
2855 /*
2721f7ea
JG
2856 * Let's remove the previously created buffer registry channel so
2857 * it's not visible anymore in the session registry.
7972aab2 2858 */
2721f7ea
JG
2859 ust_registry_channel_del_free(reg_uid->registry->reg.ust,
2860 ua_chan->tracing_channel_id, false);
2861 buffer_reg_channel_remove(reg_uid->registry, reg_chan);
2862 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
2863 goto error;
7972aab2
DG
2864 }
2865
2721f7ea
JG
2866 /*
2867 * Setup the streams and add it to the session registry.
2868 */
2869 ret = setup_buffer_reg_channel(reg_uid->registry,
2870 ua_chan, reg_chan, app);
2871 if (ret < 0) {
2872 ERR("Error setting up UST channel \"%s\"", ua_chan->name);
2873 goto error;
2874 }
2875
e098433c
JG
2876 /* Notify the notification subsystem of the channel's creation. */
2877 pthread_mutex_lock(&reg_uid->registry->reg.ust->lock);
2878 chan_reg = ust_registry_channel_find(reg_uid->registry->reg.ust,
2879 ua_chan->tracing_channel_id);
2880 assert(chan_reg);
2881 chan_reg->consumer_key = ua_chan->key;
2882 chan_reg = NULL;
2883 pthread_mutex_unlock(&reg_uid->registry->reg.ust->lock);
e9404c27 2884
e098433c
JG
2885 notification_ret = notification_thread_command_add_channel(
2886 notification_thread_handle, session->name,
470cc211
JG
2887 ua_sess->effective_credentials.uid,
2888 ua_sess->effective_credentials.gid, ua_chan->name,
2889 ua_chan->key, LTTNG_DOMAIN_UST,
e098433c
JG
2890 ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf);
2891 if (notification_ret != LTTNG_OK) {
2892 ret = - (int) notification_ret;
2893 ERR("Failed to add channel to notification thread");
2894 goto error;
e9404c27
JG
2895 }
2896
2721f7ea 2897send_channel:
66ff8e3f
JG
2898 /* Send buffers to the application. */
2899 ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan);
2900 if (ret < 0) {
2901 if (ret != -ENOTCONN) {
2902 ERR("Error sending channel to application");
2903 }
2904 goto error;
2905 }
2906
9730260e 2907error:
e32d7f27
JG
2908 if (session) {
2909 session_put(session);
2910 }
9730260e
DG
2911 return ret;
2912}
2913
78f0bacd 2914/*
7972aab2
DG
2915 * Create and send to the application the created buffers with per PID buffers.
2916 *
fad1ed2f 2917 * Called with UST app session lock held.
71e0a100 2918 * The session list lock and the session's lock must be acquired.
fad1ed2f 2919 *
7972aab2 2920 * Return 0 on success else a negative value.
78f0bacd 2921 */
7972aab2
DG
2922static int create_channel_per_pid(struct ust_app *app,
2923 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2924 struct ust_app_channel *ua_chan)
78f0bacd 2925{
8535a6d9 2926 int ret;
7972aab2 2927 struct ust_registry_session *registry;
e9404c27 2928 enum lttng_error_code cmd_ret;
e32d7f27 2929 struct ltt_session *session = NULL;
e9404c27
JG
2930 uint64_t chan_reg_key;
2931 struct ust_registry_channel *chan_reg;
78f0bacd 2932
7972aab2
DG
2933 assert(app);
2934 assert(usess);
2935 assert(ua_sess);
2936 assert(ua_chan);
2937
2938 DBG("UST app creating channel %s with per PID buffers", ua_chan->name);
2939
2940 rcu_read_lock();
2941
2942 registry = get_session_registry(ua_sess);
fad1ed2f 2943 /* The UST app session lock is held, registry shall not be null. */
7972aab2
DG
2944 assert(registry);
2945
2946 /* Create and add a new channel registry to session. */
2947 ret = ust_registry_channel_add(registry, ua_chan->key);
78f0bacd 2948 if (ret < 0) {
f14256d6
MD
2949 ERR("Error creating the UST channel \"%s\" registry instance",
2950 ua_chan->name);
78f0bacd
DG
2951 goto error;
2952 }
2953
e098433c
JG
2954 session = session_find_by_id(ua_sess->tracing_id);
2955 assert(session);
2956
2957 assert(pthread_mutex_trylock(&session->lock));
2958 assert(session_trylock_list());
2959
7972aab2
DG
2960 /* Create and get channel on the consumer side. */
2961 ret = do_consumer_create_channel(usess, ua_sess, ua_chan,
e098433c 2962 app->bits_per_long, registry,
d2956687 2963 session->most_recent_chunk_id.value);
7972aab2 2964 if (ret < 0) {
f14256d6
MD
2965 ERR("Error creating UST channel \"%s\" on the consumer daemon",
2966 ua_chan->name);
5b951542 2967 goto error_remove_from_registry;
7972aab2
DG
2968 }
2969
2970 ret = send_channel_pid_to_ust(app, ua_sess, ua_chan);
2971 if (ret < 0) {
a7169585
MD
2972 if (ret != -ENOTCONN) {
2973 ERR("Error sending channel to application");
2974 }
5b951542 2975 goto error_remove_from_registry;
7972aab2 2976 }
8535a6d9 2977
e9404c27
JG
2978 chan_reg_key = ua_chan->key;
2979 pthread_mutex_lock(&registry->lock);
2980 chan_reg = ust_registry_channel_find(registry, chan_reg_key);
2981 assert(chan_reg);
2982 chan_reg->consumer_key = ua_chan->key;
2983 pthread_mutex_unlock(&registry->lock);
2984
2985 cmd_ret = notification_thread_command_add_channel(
2986 notification_thread_handle, session->name,
470cc211
JG
2987 ua_sess->effective_credentials.uid,
2988 ua_sess->effective_credentials.gid, ua_chan->name,
2989 ua_chan->key, LTTNG_DOMAIN_UST,
e9404c27
JG
2990 ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf);
2991 if (cmd_ret != LTTNG_OK) {
2992 ret = - (int) cmd_ret;
2993 ERR("Failed to add channel to notification thread");
5b951542 2994 goto error_remove_from_registry;
e9404c27
JG
2995 }
2996
5b951542
MD
2997error_remove_from_registry:
2998 if (ret) {
2999 ust_registry_channel_del_free(registry, ua_chan->key, false);
3000 }
78f0bacd 3001error:
7972aab2 3002 rcu_read_unlock();
e32d7f27
JG
3003 if (session) {
3004 session_put(session);
3005 }
78f0bacd
DG
3006 return ret;
3007}
3008
3009/*
7972aab2 3010 * From an already allocated ust app channel, create the channel buffers if
88e3c2f5 3011 * needed and send them to the application. This MUST be called with a RCU read
7972aab2
DG
3012 * side lock acquired.
3013 *
fad1ed2f
JR
3014 * Called with UST app session lock held.
3015 *
a7169585
MD
3016 * Return 0 on success or else a negative value. Returns -ENOTCONN if
3017 * the application exited concurrently.
78f0bacd 3018 */
88e3c2f5 3019static int ust_app_channel_send(struct ust_app *app,
7972aab2
DG
3020 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
3021 struct ust_app_channel *ua_chan)
78f0bacd 3022{
7972aab2 3023 int ret;
78f0bacd 3024
7972aab2
DG
3025 assert(app);
3026 assert(usess);
88e3c2f5 3027 assert(usess->active);
7972aab2
DG
3028 assert(ua_sess);
3029 assert(ua_chan);
3030
3031 /* Handle buffer type before sending the channel to the application. */
3032 switch (usess->buffer_type) {
3033 case LTTNG_BUFFER_PER_UID:
3034 {
3035 ret = create_channel_per_uid(app, usess, ua_sess, ua_chan);
3036 if (ret < 0) {
3037 goto error;
3038 }
3039 break;
3040 }
3041 case LTTNG_BUFFER_PER_PID:
3042 {
3043 ret = create_channel_per_pid(app, usess, ua_sess, ua_chan);
3044 if (ret < 0) {
3045 goto error;
3046 }
3047 break;
3048 }
3049 default:
3050 assert(0);
3051 ret = -EINVAL;
78f0bacd
DG
3052 goto error;
3053 }
3054
7972aab2
DG
3055 /* Initialize ust objd object using the received handle and add it. */
3056 lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle);
3057 lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node);
78f0bacd 3058
7972aab2
DG
3059 /* If channel is not enabled, disable it on the tracer */
3060 if (!ua_chan->enabled) {
3061 ret = disable_ust_channel(app, ua_sess, ua_chan);
3062 if (ret < 0) {
3063 goto error;
3064 }
78f0bacd
DG
3065 }
3066
3067error:
3068 return ret;
3069}
3070
284d8f55 3071/*
88e3c2f5 3072 * Create UST app channel and return it through ua_chanp if not NULL.
d0b96690 3073 *
36b588ed 3074 * Called with UST app session lock and RCU read-side lock held.
7972aab2 3075 *
88e3c2f5 3076 * Return 0 on success or else a negative value.
284d8f55 3077 */
88e3c2f5
JG
3078static int ust_app_channel_allocate(struct ust_app_session *ua_sess,
3079 struct ltt_ust_channel *uchan,
7972aab2 3080 enum lttng_ust_chan_type type, struct ltt_ust_session *usess,
4d710ac2 3081 struct ust_app_channel **ua_chanp)
5b4a0ec0
DG
3082{
3083 int ret = 0;
bec39940
DG
3084 struct lttng_ht_iter iter;
3085 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
3086 struct ust_app_channel *ua_chan;
3087
3088 /* Lookup channel in the ust app session */
bec39940
DG
3089 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
3090 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
fc34caaa 3091 if (ua_chan_node != NULL) {
5b4a0ec0 3092 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
fc34caaa 3093 goto end;
5b4a0ec0
DG
3094 }
3095
d0b96690 3096 ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr);
fc34caaa
DG
3097 if (ua_chan == NULL) {
3098 /* Only malloc can fail here */
4d710ac2 3099 ret = -ENOMEM;
88e3c2f5 3100 goto error;
fc34caaa
DG
3101 }
3102 shadow_copy_channel(ua_chan, uchan);
3103
ffe60014
DG
3104 /* Set channel type. */
3105 ua_chan->attr.type = type;
3106
d0b96690
DG
3107 /* Only add the channel if successful on the tracer side. */
3108 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
fc34caaa 3109end:
4d710ac2
DG
3110 if (ua_chanp) {
3111 *ua_chanp = ua_chan;
3112 }
3113
3114 /* Everything went well. */
3115 return 0;
5b4a0ec0
DG
3116
3117error:
4d710ac2 3118 return ret;
5b4a0ec0
DG
3119}
3120
3121/*
3122 * Create UST app event and create it on the tracer side.
d0b96690
DG
3123 *
3124 * Called with ust app session mutex held.
5b4a0ec0 3125 */
edb67388
DG
3126static
3127int create_ust_app_event(struct ust_app_session *ua_sess,
3128 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
3129 struct ust_app *app)
284d8f55 3130{
edb67388 3131 int ret = 0;
5b4a0ec0 3132 struct ust_app_event *ua_event;
284d8f55 3133
edb67388
DG
3134 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
3135 if (ua_event == NULL) {
3136 /* Only malloc can failed so something is really wrong */
3137 ret = -ENOMEM;
fc34caaa 3138 goto end;
5b4a0ec0 3139 }
edb67388 3140 shadow_copy_event(ua_event, uevent);
5b4a0ec0 3141
edb67388 3142 /* Create it on the tracer side */
5b4a0ec0 3143 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 3144 if (ret < 0) {
fc34caaa 3145 /* Not found previously means that it does not exist on the tracer */
76f66f63 3146 assert(ret != -LTTNG_UST_ERR_EXIST);
284d8f55
DG
3147 goto error;
3148 }
3149
d0b96690 3150 add_unique_ust_app_event(ua_chan, ua_event);
284d8f55 3151
fc34caaa 3152 DBG2("UST app create event %s for PID %d completed", ua_event->name,
852d0037 3153 app->pid);
7f79d3a1 3154
edb67388 3155end:
fc34caaa
DG
3156 return ret;
3157
5b4a0ec0 3158error:
fc34caaa 3159 /* Valid. Calling here is already in a read side lock */
fb45065e 3160 delete_ust_app_event(-1, ua_event, app);
edb67388 3161 return ret;
5b4a0ec0
DG
3162}
3163
3164/*
3165 * Create UST metadata and open it on the tracer side.
d0b96690 3166 *
7972aab2 3167 * Called with UST app session lock held and RCU read side lock.
5b4a0ec0
DG
3168 */
3169static int create_ust_app_metadata(struct ust_app_session *ua_sess,
ad7a9107 3170 struct ust_app *app, struct consumer_output *consumer)
5b4a0ec0
DG
3171{
3172 int ret = 0;
ffe60014 3173 struct ust_app_channel *metadata;
d88aee68 3174 struct consumer_socket *socket;
7972aab2 3175 struct ust_registry_session *registry;
e32d7f27 3176 struct ltt_session *session = NULL;
5b4a0ec0 3177
ffe60014
DG
3178 assert(ua_sess);
3179 assert(app);
d88aee68 3180 assert(consumer);
5b4a0ec0 3181
7972aab2 3182 registry = get_session_registry(ua_sess);
fad1ed2f 3183 /* The UST app session is held registry shall not be null. */
7972aab2
DG
3184 assert(registry);
3185
ce34fcd0
MD
3186 pthread_mutex_lock(&registry->lock);
3187
1b532a60
DG
3188 /* Metadata already exists for this registry or it was closed previously */
3189 if (registry->metadata_key || registry->metadata_closed) {
7972aab2
DG
3190 ret = 0;
3191 goto error;
5b4a0ec0
DG
3192 }
3193
ffe60014 3194 /* Allocate UST metadata */
d0b96690 3195 metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL);
ffe60014
DG
3196 if (!metadata) {
3197 /* malloc() failed */
3198 ret = -ENOMEM;
3199 goto error;
3200 }
5b4a0ec0 3201
ad7a9107 3202 memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr));
5b4a0ec0 3203
7972aab2
DG
3204 /* Need one fd for the channel. */
3205 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
3206 if (ret < 0) {
3207 ERR("Exhausted number of available FD upon create metadata");
3208 goto error;
3209 }
3210
4dc3dfc5
DG
3211 /* Get the right consumer socket for the application. */
3212 socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer);
3213 if (!socket) {
3214 ret = -EINVAL;
3215 goto error_consumer;
3216 }
3217
331744e3
JD
3218 /*
3219 * Keep metadata key so we can identify it on the consumer side. Assign it
3220 * to the registry *before* we ask the consumer so we avoid the race of the
3221 * consumer requesting the metadata and the ask_channel call on our side
3222 * did not returned yet.
3223 */
3224 registry->metadata_key = metadata->key;
3225
e098433c
JG
3226 session = session_find_by_id(ua_sess->tracing_id);
3227 assert(session);
3228
3229 assert(pthread_mutex_trylock(&session->lock));
3230 assert(session_trylock_list());
3231
d88aee68
DG
3232 /*
3233 * Ask the metadata channel creation to the consumer. The metadata object
3234 * will be created by the consumer and kept their. However, the stream is
3235 * never added or monitored until we do a first push metadata to the
3236 * consumer.
3237 */
7972aab2 3238 ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket,
d2956687 3239 registry, session->current_trace_chunk);
d88aee68 3240 if (ret < 0) {
f2a444f1
DG
3241 /* Nullify the metadata key so we don't try to close it later on. */
3242 registry->metadata_key = 0;
d88aee68
DG
3243 goto error_consumer;
3244 }
3245
3246 /*
3247 * The setup command will make the metadata stream be sent to the relayd,
3248 * if applicable, and the thread managing the metadatas. This is important
3249 * because after this point, if an error occurs, the only way the stream
3250 * can be deleted is to be monitored in the consumer.
3251 */
7972aab2 3252 ret = consumer_setup_metadata(socket, metadata->key);
ffe60014 3253 if (ret < 0) {
f2a444f1
DG
3254 /* Nullify the metadata key so we don't try to close it later on. */
3255 registry->metadata_key = 0;
d88aee68 3256 goto error_consumer;
5b4a0ec0
DG
3257 }
3258
7972aab2
DG
3259 DBG2("UST metadata with key %" PRIu64 " created for app pid %d",
3260 metadata->key, app->pid);
5b4a0ec0 3261
d88aee68 3262error_consumer:
b80f0b6c 3263 lttng_fd_put(LTTNG_FD_APPS, 1);
d88aee68 3264 delete_ust_app_channel(-1, metadata, app);
5b4a0ec0 3265error:
ce34fcd0 3266 pthread_mutex_unlock(&registry->lock);
e32d7f27
JG
3267 if (session) {
3268 session_put(session);
3269 }
ffe60014 3270 return ret;
5b4a0ec0
DG
3271}
3272
5b4a0ec0 3273/*
d88aee68
DG
3274 * Return ust app pointer or NULL if not found. RCU read side lock MUST be
3275 * acquired before calling this function.
5b4a0ec0
DG
3276 */
3277struct ust_app *ust_app_find_by_pid(pid_t pid)
3278{
d88aee68 3279 struct ust_app *app = NULL;
bec39940
DG
3280 struct lttng_ht_node_ulong *node;
3281 struct lttng_ht_iter iter;
5b4a0ec0 3282
bec39940
DG
3283 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
3284 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
3285 if (node == NULL) {
3286 DBG2("UST app no found with pid %d", pid);
3287 goto error;
3288 }
5b4a0ec0
DG
3289
3290 DBG2("Found UST app by pid %d", pid);
3291
d88aee68 3292 app = caa_container_of(node, struct ust_app, pid_n);
5b4a0ec0
DG
3293
3294error:
d88aee68 3295 return app;
5b4a0ec0
DG
3296}
3297
d88aee68
DG
3298/*
3299 * Allocate and init an UST app object using the registration information and
3300 * the command socket. This is called when the command socket connects to the
3301 * session daemon.
3302 *
3303 * The object is returned on success or else NULL.
3304 */
d0b96690 3305struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock)
5b4a0ec0 3306{
d0b96690
DG
3307 struct ust_app *lta = NULL;
3308
3309 assert(msg);
3310 assert(sock >= 0);
3311
3312 DBG3("UST app creating application for socket %d", sock);
5b4a0ec0 3313
173af62f
DG
3314 if ((msg->bits_per_long == 64 &&
3315 (uatomic_read(&ust_consumerd64_fd) == -EINVAL))
3316 || (msg->bits_per_long == 32 &&
3317 (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) {
f943b0fb 3318 ERR("Registration failed: application \"%s\" (pid: %d) has "
d0b96690
DG
3319 "%d-bit long, but no consumerd for this size is available.\n",
3320 msg->name, msg->pid, msg->bits_per_long);
3321 goto error;
3f2c5fcc 3322 }
d0b96690 3323
5b4a0ec0
DG
3324 lta = zmalloc(sizeof(struct ust_app));
3325 if (lta == NULL) {
3326 PERROR("malloc");
d0b96690 3327 goto error;
5b4a0ec0
DG
3328 }
3329
3330 lta->ppid = msg->ppid;
3331 lta->uid = msg->uid;
3332 lta->gid = msg->gid;
d0b96690 3333
7753dea8 3334 lta->bits_per_long = msg->bits_per_long;
d0b96690
DG
3335 lta->uint8_t_alignment = msg->uint8_t_alignment;
3336 lta->uint16_t_alignment = msg->uint16_t_alignment;
3337 lta->uint32_t_alignment = msg->uint32_t_alignment;
3338 lta->uint64_t_alignment = msg->uint64_t_alignment;
3339 lta->long_alignment = msg->long_alignment;
3340 lta->byte_order = msg->byte_order;
3341
5b4a0ec0
DG
3342 lta->v_major = msg->major;
3343 lta->v_minor = msg->minor;
d9bf3ca4 3344 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
d0b96690 3345 lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
10b56aef 3346 lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
d0b96690 3347 lta->notify_sock = -1;
d88aee68
DG
3348
3349 /* Copy name and make sure it's NULL terminated. */
3350 strncpy(lta->name, msg->name, sizeof(lta->name));
3351 lta->name[UST_APP_PROCNAME_LEN] = '\0';
3352
3353 /*
3354 * Before this can be called, when receiving the registration information,
3355 * the application compatibility is checked. So, at this point, the
3356 * application can work with this session daemon.
3357 */
d0b96690 3358 lta->compatible = 1;
5b4a0ec0 3359
852d0037 3360 lta->pid = msg->pid;
d0b96690 3361 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long) lta->pid);
852d0037 3362 lta->sock = sock;
fb45065e 3363 pthread_mutex_init(&lta->sock_lock, NULL);
d0b96690 3364 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long) lta->sock);
5b4a0ec0 3365
d42f20df 3366 CDS_INIT_LIST_HEAD(&lta->teardown_head);
d0b96690
DG
3367error:
3368 return lta;
3369}
3370
d88aee68
DG
3371/*
3372 * For a given application object, add it to every hash table.
3373 */
d0b96690
DG
3374void ust_app_add(struct ust_app *app)
3375{
3376 assert(app);
3377 assert(app->notify_sock >= 0);
3378
940c4592
JR
3379 app->registration_time = time(NULL);
3380
5b4a0ec0 3381 rcu_read_lock();
852d0037
DG
3382
3383 /*
3384 * On a re-registration, we want to kick out the previous registration of
3385 * that pid
3386 */
d0b96690 3387 lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n);
852d0037
DG
3388
3389 /*
3390 * The socket _should_ be unique until _we_ call close. So, a add_unique
3391 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
3392 * already in the table.
3393 */
d0b96690 3394 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n);
852d0037 3395
d0b96690
DG
3396 /* Add application to the notify socket hash table. */
3397 lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock);
3398 lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n);
5b4a0ec0 3399
d0b96690 3400 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s "
d88aee68
DG
3401 "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid,
3402 app->gid, app->sock, app->name, app->notify_sock, app->v_major,
3403 app->v_minor);
5b4a0ec0 3404
d0b96690
DG
3405 rcu_read_unlock();
3406}
3407
d88aee68
DG
3408/*
3409 * Set the application version into the object.
3410 *
3411 * Return 0 on success else a negative value either an errno code or a
3412 * LTTng-UST error code.
3413 */
d0b96690
DG
3414int ust_app_version(struct ust_app *app)
3415{
d88aee68
DG
3416 int ret;
3417
d0b96690 3418 assert(app);
d88aee68 3419
fb45065e 3420 pthread_mutex_lock(&app->sock_lock);
d88aee68 3421 ret = ustctl_tracer_version(app->sock, &app->version);
fb45065e 3422 pthread_mutex_unlock(&app->sock_lock);
d88aee68
DG
3423 if (ret < 0) {
3424 if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
5368d366 3425 ERR("UST app %d version failed with ret %d", app->sock, ret);
d88aee68 3426 } else {
5368d366 3427 DBG3("UST app %d version failed. Application is dead", app->sock);
d88aee68
DG
3428 }
3429 }
3430
3431 return ret;
5b4a0ec0
DG
3432}
3433
3434/*
3435 * Unregister app by removing it from the global traceable app list and freeing
3436 * the data struct.
3437 *
3438 * The socket is already closed at this point so no close to sock.
3439 */
3440void ust_app_unregister(int sock)
3441{
3442 struct ust_app *lta;
bec39940 3443 struct lttng_ht_node_ulong *node;
c4b88406 3444 struct lttng_ht_iter ust_app_sock_iter;
bec39940 3445 struct lttng_ht_iter iter;
d42f20df 3446 struct ust_app_session *ua_sess;
525b0740 3447 int ret;
5b4a0ec0
DG
3448
3449 rcu_read_lock();
886459c6 3450
5b4a0ec0 3451 /* Get the node reference for a call_rcu */
c4b88406
MD
3452 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter);
3453 node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter);
d0b96690 3454 assert(node);
284d8f55 3455
852d0037 3456 lta = caa_container_of(node, struct ust_app, sock_n);
852d0037
DG
3457 DBG("PID %d unregistering with sock %d", lta->pid, sock);
3458
d88aee68 3459 /*
ce34fcd0
MD
3460 * For per-PID buffers, perform "push metadata" and flush all
3461 * application streams before removing app from hash tables,
3462 * ensuring proper behavior of data_pending check.
c4b88406 3463 * Remove sessions so they are not visible during deletion.
d88aee68 3464 */
d42f20df
DG
3465 cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess,
3466 node.node) {
7972aab2
DG
3467 struct ust_registry_session *registry;
3468
d42f20df
DG
3469 ret = lttng_ht_del(lta->sessions, &iter);
3470 if (ret) {
3471 /* The session was already removed so scheduled for teardown. */
3472 continue;
3473 }
3474
ce34fcd0
MD
3475 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) {
3476 (void) ust_app_flush_app_session(lta, ua_sess);
3477 }
c4b88406 3478
d42f20df
DG
3479 /*
3480 * Add session to list for teardown. This is safe since at this point we
3481 * are the only one using this list.
3482 */
d88aee68
DG
3483 pthread_mutex_lock(&ua_sess->lock);
3484
b161602a
MD
3485 if (ua_sess->deleted) {
3486 pthread_mutex_unlock(&ua_sess->lock);
3487 continue;
3488 }
3489
d88aee68
DG
3490 /*
3491 * Normally, this is done in the delete session process which is
3492 * executed in the call rcu below. However, upon registration we can't
3493 * afford to wait for the grace period before pushing data or else the
3494 * data pending feature can race between the unregistration and stop
3495 * command where the data pending command is sent *before* the grace
3496 * period ended.
3497 *
3498 * The close metadata below nullifies the metadata pointer in the
3499 * session so the delete session will NOT push/close a second time.
3500 */
7972aab2 3501 registry = get_session_registry(ua_sess);
ce34fcd0 3502 if (registry) {
7972aab2
DG
3503 /* Push metadata for application before freeing the application. */
3504 (void) push_metadata(registry, ua_sess->consumer);
3505
3506 /*
3507 * Don't ask to close metadata for global per UID buffers. Close
1b532a60
DG
3508 * metadata only on destroy trace session in this case. Also, the
3509 * previous push metadata could have flag the metadata registry to
3510 * close so don't send a close command if closed.
7972aab2 3511 */
ce34fcd0 3512 if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) {
7972aab2
DG
3513 /* And ask to close it for this session registry. */
3514 (void) close_metadata(registry, ua_sess->consumer);
3515 }
3516 }
d42f20df 3517 cds_list_add(&ua_sess->teardown_node, &lta->teardown_head);
c4b88406 3518
d88aee68 3519 pthread_mutex_unlock(&ua_sess->lock);
d42f20df
DG
3520 }
3521
c4b88406
MD
3522 /* Remove application from PID hash table */
3523 ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter);
3524 assert(!ret);
3525
3526 /*
3527 * Remove application from notify hash table. The thread handling the
3528 * notify socket could have deleted the node so ignore on error because
c48239ca
JG
3529 * either way it's valid. The close of that socket is handled by the
3530 * apps_notify_thread.
c4b88406
MD
3531 */
3532 iter.iter.node = &lta->notify_sock_n.node;
3533 (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
3534
3535 /*
3536 * Ignore return value since the node might have been removed before by an
3537 * add replace during app registration because the PID can be reassigned by
3538 * the OS.
3539 */
3540 iter.iter.node = &lta->pid_n.node;
3541 ret = lttng_ht_del(ust_app_ht, &iter);
3542 if (ret) {
3543 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
3544 lta->pid);
3545 }
3546
852d0037
DG
3547 /* Free memory */
3548 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
3549
5b4a0ec0
DG
3550 rcu_read_unlock();
3551 return;
284d8f55
DG
3552}
3553
5b4a0ec0
DG
3554/*
3555 * Fill events array with all events name of all registered apps.
3556 */
3557int ust_app_list_events(struct lttng_event **events)
421cb601 3558{
5b4a0ec0
DG
3559 int ret, handle;
3560 size_t nbmem, count = 0;
bec39940 3561 struct lttng_ht_iter iter;
5b4a0ec0 3562 struct ust_app *app;
c617c0c6 3563 struct lttng_event *tmp_event;
421cb601 3564
5b4a0ec0 3565 nbmem = UST_APP_EVENT_LIST_SIZE;
c617c0c6
MD
3566 tmp_event = zmalloc(nbmem * sizeof(struct lttng_event));
3567 if (tmp_event == NULL) {
5b4a0ec0
DG
3568 PERROR("zmalloc ust app events");
3569 ret = -ENOMEM;
421cb601
DG
3570 goto error;
3571 }
3572
5b4a0ec0 3573 rcu_read_lock();
421cb601 3574
852d0037 3575 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
90eaa0d2 3576 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 3577
840cb59c 3578 health_code_update();
86acf0da 3579
e0c7ec2b
DG
3580 if (!app->compatible) {
3581 /*
3582 * TODO: In time, we should notice the caller of this error by
3583 * telling him that this is a version error.
3584 */
3585 continue;
3586 }
fb45065e 3587 pthread_mutex_lock(&app->sock_lock);
852d0037 3588 handle = ustctl_tracepoint_list(app->sock);
5b4a0ec0 3589 if (handle < 0) {
ffe60014
DG
3590 if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) {
3591 ERR("UST app list events getting handle failed for app pid %d",
3592 app->pid);
3593 }
fb45065e 3594 pthread_mutex_unlock(&app->sock_lock);
5b4a0ec0
DG
3595 continue;
3596 }
421cb601 3597
852d0037 3598 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
fb54cdbf 3599 &uiter)) != -LTTNG_UST_ERR_NOENT) {
ffe60014
DG
3600 /* Handle ustctl error. */
3601 if (ret < 0) {
fb45065e
MD
3602 int release_ret;
3603
a2ba1ab0 3604 if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
ffe60014
DG
3605 ERR("UST app tp list get failed for app %d with ret %d",
3606 app->sock, ret);
3607 } else {
3608 DBG3("UST app tp list get failed. Application is dead");
3757b385
DG
3609 /*
3610 * This is normal behavior, an application can die during the
3611 * creation process. Don't report an error so the execution can
3612 * continue normally. Continue normal execution.
3613 */
3614 break;
ffe60014 3615 }
98f595d4 3616 free(tmp_event);
fb45065e 3617 release_ret = ustctl_release_handle(app->sock, handle);
68313703
JG
3618 if (release_ret < 0 &&
3619 release_ret != -LTTNG_UST_ERR_EXITING &&
3620 release_ret != -EPIPE) {
fb45065e
MD
3621 ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret);
3622 }
3623 pthread_mutex_unlock(&app->sock_lock);
ffe60014
DG
3624 goto rcu_error;
3625 }
3626
840cb59c 3627 health_code_update();
815564d8 3628 if (count >= nbmem) {
d7b3776f 3629 /* In case the realloc fails, we free the memory */
53efb85a
MD
3630 struct lttng_event *new_tmp_event;
3631 size_t new_nbmem;
3632
3633 new_nbmem = nbmem << 1;
3634 DBG2("Reallocating event list from %zu to %zu entries",
3635 nbmem, new_nbmem);
3636 new_tmp_event = realloc(tmp_event,
3637 new_nbmem * sizeof(struct lttng_event));
3638 if (new_tmp_event == NULL) {
fb45065e
MD
3639 int release_ret;
3640
5b4a0ec0 3641 PERROR("realloc ust app events");
c617c0c6 3642 free(tmp_event);
5b4a0ec0 3643 ret = -ENOMEM;
fb45065e 3644 release_ret = ustctl_release_handle(app->sock, handle);
68313703
JG
3645 if (release_ret < 0 &&
3646 release_ret != -LTTNG_UST_ERR_EXITING &&
3647 release_ret != -EPIPE) {
fb45065e
MD
3648 ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret);
3649 }
3650 pthread_mutex_unlock(&app->sock_lock);
5b4a0ec0
DG
3651 goto rcu_error;
3652 }
53efb85a
MD
3653 /* Zero the new memory */
3654 memset(new_tmp_event + nbmem, 0,
3655 (new_nbmem - nbmem) * sizeof(struct lttng_event));
3656 nbmem = new_nbmem;
3657 tmp_event = new_tmp_event;
5b4a0ec0 3658 }
c617c0c6
MD
3659 memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
3660 tmp_event[count].loglevel = uiter.loglevel;
3661 tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
3662 tmp_event[count].pid = app->pid;
3663 tmp_event[count].enabled = -1;
5b4a0ec0 3664 count++;
421cb601 3665 }
fb45065e
MD
3666 ret = ustctl_release_handle(app->sock, handle);
3667 pthread_mutex_unlock(&app->sock_lock);
68313703 3668 if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
fb45065e
MD
3669 ERR("Error releasing app handle for app %d with ret %d", app->sock, ret);
3670 }
421cb601
DG
3671 }
3672
5b4a0ec0 3673 ret = count;
c617c0c6 3674 *events = tmp_event;
421cb601 3675
5b4a0ec0 3676 DBG2("UST app list events done (%zu events)", count);
421cb601 3677
5b4a0ec0
DG
3678rcu_error:
3679 rcu_read_unlock();
421cb601 3680error:
840cb59c 3681 health_code_update();
5b4a0ec0 3682 return ret;
421cb601
DG
3683}
3684
f37d259d
MD
3685/*
3686 * Fill events array with all events name of all registered apps.
3687 */
3688int ust_app_list_event_fields(struct lttng_event_field **fields)
3689{
3690 int ret, handle;
3691 size_t nbmem, count = 0;
3692 struct lttng_ht_iter iter;
3693 struct ust_app *app;
c617c0c6 3694 struct lttng_event_field *tmp_event;
f37d259d
MD
3695
3696 nbmem = UST_APP_EVENT_LIST_SIZE;
c617c0c6
MD
3697 tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field));
3698 if (tmp_event == NULL) {
f37d259d
MD
3699 PERROR("zmalloc ust app event fields");
3700 ret = -ENOMEM;
3701 goto error;
3702 }
3703
3704 rcu_read_lock();
3705
3706 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
3707 struct lttng_ust_field_iter uiter;
3708
840cb59c 3709 health_code_update();
86acf0da 3710
f37d259d
MD
3711 if (!app->compatible) {
3712 /*
3713 * TODO: In time, we should notice the caller of this error by
3714 * telling him that this is a version error.
3715 */
3716 continue;
3717 }
fb45065e 3718 pthread_mutex_lock(&app->sock_lock);
f37d259d
MD
3719 handle = ustctl_tracepoint_field_list(app->sock);
3720 if (handle < 0) {
ffe60014
DG
3721 if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) {
3722 ERR("UST app list field getting handle failed for app pid %d",
3723 app->pid);
3724 }
fb45065e 3725 pthread_mutex_unlock(&app->sock_lock);
f37d259d
MD
3726 continue;
3727 }
3728
3729 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
fb54cdbf 3730 &uiter)) != -LTTNG_UST_ERR_NOENT) {
ffe60014
DG
3731 /* Handle ustctl error. */
3732 if (ret < 0) {
fb45065e
MD
3733 int release_ret;
3734
a2ba1ab0 3735 if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
ffe60014
DG
3736 ERR("UST app tp list field failed for app %d with ret %d",
3737 app->sock, ret);
3738 } else {
3739 DBG3("UST app tp list field failed. Application is dead");
3757b385
DG
3740 /*
3741 * This is normal behavior, an application can die during the
3742 * creation process. Don't report an error so the execution can
98f595d4 3743 * continue normally. Reset list and count for next app.
3757b385
DG
3744 */
3745 break;
ffe60014 3746 }
98f595d4 3747 free(tmp_event);
fb45065e
MD
3748 release_ret = ustctl_release_handle(app->sock, handle);
3749 pthread_mutex_unlock(&app->sock_lock);
68313703
JG
3750 if (release_ret < 0 &&
3751 release_ret != -LTTNG_UST_ERR_EXITING &&
3752 release_ret != -EPIPE) {
fb45065e
MD
3753 ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret);
3754 }
ffe60014
DG
3755 goto rcu_error;
3756 }
3757
840cb59c 3758 health_code_update();
f37d259d 3759 if (count >= nbmem) {
d7b3776f 3760 /* In case the realloc fails, we free the memory */
53efb85a
MD
3761 struct lttng_event_field *new_tmp_event;
3762 size_t new_nbmem;
3763
3764 new_nbmem = nbmem << 1;
3765 DBG2("Reallocating event field list from %zu to %zu entries",
3766 nbmem, new_nbmem);
3767 new_tmp_event = realloc(tmp_event,
3768 new_nbmem * sizeof(struct lttng_event_field));
3769 if (new_tmp_event == NULL) {
fb45065e
MD
3770 int release_ret;
3771
f37d259d 3772 PERROR("realloc ust app event fields");
c617c0c6 3773 free(tmp_event);
f37d259d 3774 ret = -ENOMEM;
fb45065e
MD
3775 release_ret = ustctl_release_handle(app->sock, handle);
3776 pthread_mutex_unlock(&app->sock_lock);
68313703
JG
3777 if (release_ret &&
3778 release_ret != -LTTNG_UST_ERR_EXITING &&
3779 release_ret != -EPIPE) {
fb45065e
MD
3780 ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret);
3781 }
f37d259d
MD
3782 goto rcu_error;
3783 }
53efb85a
MD
3784 /* Zero the new memory */
3785 memset(new_tmp_event + nbmem, 0,
3786 (new_nbmem - nbmem) * sizeof(struct lttng_event_field));
3787 nbmem = new_nbmem;
3788 tmp_event = new_tmp_event;
f37d259d 3789 }
f37d259d 3790
c617c0c6 3791 memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
2e84128e
DG
3792 /* Mapping between these enums matches 1 to 1. */
3793 tmp_event[count].type = (enum lttng_event_field_type) uiter.type;
c617c0c6 3794 tmp_event[count].nowrite = uiter.nowrite;
f37d259d 3795
c617c0c6
MD
3796 memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
3797 tmp_event[count].event.loglevel = uiter.loglevel;
2e84128e 3798 tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT;
c617c0c6
MD
3799 tmp_event[count].event.pid = app->pid;
3800 tmp_event[count].event.enabled = -1;
f37d259d
MD
3801 count++;
3802 }
fb45065e
MD
3803 ret = ustctl_release_handle(app->sock, handle);
3804 pthread_mutex_unlock(&app->sock_lock);
68313703
JG
3805 if (ret < 0 &&
3806 ret != -LTTNG_UST_ERR_EXITING &&
3807 ret != -EPIPE) {
fb45065e
MD
3808 ERR("Error releasing app handle for app %d with ret %d", app->sock, ret);
3809 }
f37d259d
MD
3810 }
3811
3812 ret = count;
c617c0c6 3813 *fields = tmp_event;
f37d259d
MD
3814
3815 DBG2("UST app list event fields done (%zu events)", count);
3816
3817rcu_error:
3818 rcu_read_unlock();
3819error:
840cb59c 3820 health_code_update();
f37d259d
MD
3821 return ret;
3822}
3823
5b4a0ec0
DG
3824/*
3825 * Free and clean all traceable apps of the global list.
36b588ed
MD
3826 *
3827 * Should _NOT_ be called with RCU read-side lock held.
5b4a0ec0
DG
3828 */
3829void ust_app_clean_list(void)
421cb601 3830{
5b4a0ec0 3831 int ret;
659ed79f 3832 struct ust_app *app;
bec39940 3833 struct lttng_ht_iter iter;
421cb601 3834
5b4a0ec0 3835 DBG2("UST app cleaning registered apps hash table");
421cb601 3836
5b4a0ec0 3837 rcu_read_lock();
421cb601 3838
faadaa3a
JG
3839 /* Cleanup notify socket hash table */
3840 if (ust_app_ht_by_notify_sock) {
3841 cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app,
3842 notify_sock_n.node) {
3843 struct cds_lfht_node *node;
3844 struct ust_app *app;
3845
3846 node = cds_lfht_iter_get_node(&iter.iter);
3847 if (!node) {
3848 continue;
3849 }
3850
3851 app = container_of(node, struct ust_app,
3852 notify_sock_n.node);
3853 ust_app_notify_sock_unregister(app->notify_sock);
3854 }
3855 }
3856
f1b711c4
MD
3857 if (ust_app_ht) {
3858 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
3859 ret = lttng_ht_del(ust_app_ht, &iter);
3860 assert(!ret);
3861 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
3862 }
421cb601
DG
3863 }
3864
852d0037 3865 /* Cleanup socket hash table */
f1b711c4
MD
3866 if (ust_app_ht_by_sock) {
3867 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app,
3868 sock_n.node) {
3869 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
3870 assert(!ret);
3871 }
bec39940 3872 }
852d0037 3873
36b588ed 3874 rcu_read_unlock();
d88aee68 3875
bec39940 3876 /* Destroy is done only when the ht is empty */
f1b711c4
MD
3877 if (ust_app_ht) {
3878 ht_cleanup_push(ust_app_ht);
3879 }
3880 if (ust_app_ht_by_sock) {
3881 ht_cleanup_push(ust_app_ht_by_sock);
3882 }
3883 if (ust_app_ht_by_notify_sock) {
3884 ht_cleanup_push(ust_app_ht_by_notify_sock);
3885 }
5b4a0ec0
DG
3886}
3887
3888/*
3889 * Init UST app hash table.
3890 */
57703f6e 3891int ust_app_ht_alloc(void)
5b4a0ec0 3892{
bec39940 3893 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
57703f6e
MD
3894 if (!ust_app_ht) {
3895 return -1;
3896 }
852d0037 3897 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
57703f6e
MD
3898 if (!ust_app_ht_by_sock) {
3899 return -1;
3900 }
d0b96690 3901 ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
57703f6e
MD
3902 if (!ust_app_ht_by_notify_sock) {
3903 return -1;
3904 }
3905 return 0;
421cb601
DG
3906}
3907
78f0bacd
DG
3908/*
3909 * For a specific UST session, disable the channel for all registered apps.
3910 */
35a9059d 3911int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
3912 struct ltt_ust_channel *uchan)
3913{
3914 int ret = 0;
bec39940
DG
3915 struct lttng_ht_iter iter;
3916 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
3917 struct ust_app *app;
3918 struct ust_app_session *ua_sess;
8535a6d9 3919 struct ust_app_channel *ua_chan;
78f0bacd 3920
88e3c2f5 3921 assert(usess->active);
d9bf3ca4 3922 DBG2("UST app disabling channel %s from global domain for session id %" PRIu64,
a991f516 3923 uchan->name, usess->id);
78f0bacd
DG
3924
3925 rcu_read_lock();
3926
3927 /* For every registered applications */
852d0037 3928 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 3929 struct lttng_ht_iter uiter;
e0c7ec2b
DG
3930 if (!app->compatible) {
3931 /*
3932 * TODO: In time, we should notice the caller of this error by
3933 * telling him that this is a version error.
3934 */
3935 continue;
3936 }
78f0bacd
DG
3937 ua_sess = lookup_session_by_app(usess, app);
3938 if (ua_sess == NULL) {
3939 continue;
3940 }
3941
8535a6d9 3942 /* Get channel */
bec39940
DG
3943 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
3944 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9
DG
3945 /* If the session if found for the app, the channel must be there */
3946 assert(ua_chan_node);
3947
3948 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
3949 /* The channel must not be already disabled */
3950 assert(ua_chan->enabled == 1);
3951
3952 /* Disable channel onto application */
3953 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
3954 if (ret < 0) {
3955 /* XXX: We might want to report this error at some point... */
3956 continue;
3957 }
3958 }
3959
3960 rcu_read_unlock();
78f0bacd
DG
3961 return ret;
3962}
3963
3964/*
3965 * For a specific UST session, enable the channel for all registered apps.
3966 */
35a9059d 3967int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
3968 struct ltt_ust_channel *uchan)
3969{
3970 int ret = 0;
bec39940 3971 struct lttng_ht_iter iter;
78f0bacd
DG
3972 struct ust_app *app;
3973 struct ust_app_session *ua_sess;
3974
88e3c2f5 3975 assert(usess->active);
d9bf3ca4 3976 DBG2("UST app enabling channel %s to global domain for session id %" PRIu64,
a991f516 3977 uchan->name, usess->id);
78f0bacd
DG
3978
3979 rcu_read_lock();
3980
3981 /* For every registered applications */
852d0037 3982 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
3983 if (!app->compatible) {
3984 /*
3985 * TODO: In time, we should notice the caller of this error by
3986 * telling him that this is a version error.
3987 */
3988 continue;
3989 }
78f0bacd
DG
3990 ua_sess = lookup_session_by_app(usess, app);
3991 if (ua_sess == NULL) {
3992 continue;
3993 }
3994
3995 /* Enable channel onto application */
3996 ret = enable_ust_app_channel(ua_sess, uchan, app);
3997 if (ret < 0) {
3998 /* XXX: We might want to report this error at some point... */
3999 continue;
4000 }
4001 }
4002
4003 rcu_read_unlock();
78f0bacd
DG
4004 return ret;
4005}
4006
b0a40d28
DG
4007/*
4008 * Disable an event in a channel and for a specific session.
4009 */
35a9059d
DG
4010int ust_app_disable_event_glb(struct ltt_ust_session *usess,
4011 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
b0a40d28
DG
4012{
4013 int ret = 0;
bec39940 4014 struct lttng_ht_iter iter, uiter;
700c5a9d 4015 struct lttng_ht_node_str *ua_chan_node;
b0a40d28
DG
4016 struct ust_app *app;
4017 struct ust_app_session *ua_sess;
4018 struct ust_app_channel *ua_chan;
4019 struct ust_app_event *ua_event;
4020
88e3c2f5 4021 assert(usess->active);
b0a40d28 4022 DBG("UST app disabling event %s for all apps in channel "
d9bf3ca4
MD
4023 "%s for session id %" PRIu64,
4024 uevent->attr.name, uchan->name, usess->id);
b0a40d28
DG
4025
4026 rcu_read_lock();
4027
4028 /* For all registered applications */
852d0037 4029 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
4030 if (!app->compatible) {
4031 /*
4032 * TODO: In time, we should notice the caller of this error by
4033 * telling him that this is a version error.
4034 */
4035 continue;
4036 }
b0a40d28
DG
4037 ua_sess = lookup_session_by_app(usess, app);
4038 if (ua_sess == NULL) {
4039 /* Next app */
4040 continue;
4041 }
4042
4043 /* Lookup channel in the ust app session */
bec39940
DG
4044 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
4045 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28 4046 if (ua_chan_node == NULL) {
d9bf3ca4 4047 DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d."
852d0037 4048 "Skipping", uchan->name, usess->id, app->pid);
b0a40d28
DG
4049 continue;
4050 }
4051 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
4052
700c5a9d
JR
4053 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
4054 uevent->filter, uevent->attr.loglevel,
4055 uevent->exclusion);
4056 if (ua_event == NULL) {
b0a40d28 4057 DBG2("Event %s not found in channel %s for app pid %d."
852d0037 4058 "Skipping", uevent->attr.name, uchan->name, app->pid);
b0a40d28
DG
4059 continue;
4060 }
b0a40d28 4061
7f79d3a1 4062 ret = disable_ust_app_event(ua_sess, ua_event, app);
b0a40d28
DG
4063 if (ret < 0) {
4064 /* XXX: Report error someday... */
4065 continue;
4066 }
4067 }
4068
4069 rcu_read_unlock();
88e3c2f5
JG
4070 return ret;
4071}
4072
4073/* The ua_sess lock must be held by the caller. */
4074static
4075int ust_app_channel_create(struct ltt_ust_session *usess,
4076 struct ust_app_session *ua_sess,
4077 struct ltt_ust_channel *uchan, struct ust_app *app,
4078 struct ust_app_channel **_ua_chan)
4079{
4080 int ret = 0;
4081 struct ust_app_channel *ua_chan = NULL;
4082
4083 assert(ua_sess);
4084 ASSERT_LOCKED(ua_sess->lock);
4085
4086 if (!strncmp(uchan->name, DEFAULT_METADATA_NAME,
4087 sizeof(uchan->name))) {
4088 copy_channel_attr_to_ustctl(&ua_sess->metadata_attr,
4089 &uchan->attr);
4090 ret = 0;
4091 } else {
4092 struct ltt_ust_context *uctx = NULL;
4093
4094 /*
4095 * Create channel onto application and synchronize its
4096 * configuration.
4097 */
4098 ret = ust_app_channel_allocate(ua_sess, uchan,
4099 LTTNG_UST_CHAN_PER_CPU, usess,
4100 &ua_chan);
4101 if (ret == 0) {
4102 ret = ust_app_channel_send(app, usess,
4103 ua_sess, ua_chan);
4104 } else {
4105 goto end;
4106 }
4107
4108 /* Add contexts. */
4109 cds_list_for_each_entry(uctx, &uchan->ctx_list, list) {
4110 ret = create_ust_app_channel_context(ua_chan,
4111 &uctx->ctx, app);
4112 if (ret) {
4113 goto end;
4114 }
4115 }
4116 }
4117 if (ret < 0) {
4118 switch (ret) {
4119 case -ENOTCONN:
4120 /*
4121 * The application's socket is not valid. Either a bad socket
4122 * or a timeout on it. We can't inform the caller that for a
4123 * specific app, the session failed so lets continue here.
4124 */
4125 ret = 0; /* Not an error. */
4126 break;
4127 case -ENOMEM:
4128 default:
4129 break;
4130 }
4131 }
0498a00c 4132end:
88e3c2f5
JG
4133 if (ret == 0 && _ua_chan) {
4134 /*
4135 * Only return the application's channel on success. Note
4136 * that the channel can still be part of the application's
4137 * channel hashtable on error.
4138 */
4139 *_ua_chan = ua_chan;
4140 }
b0a40d28
DG
4141 return ret;
4142}
4143
421cb601 4144/*
5b4a0ec0 4145 * For a specific UST session, create the channel for all registered apps.
421cb601 4146 */
35a9059d 4147int ust_app_create_channel_glb(struct ltt_ust_session *usess,
48842b30
DG
4148 struct ltt_ust_channel *uchan)
4149{
88e3c2f5
JG
4150 int ret = 0;
4151 struct cds_lfht_iter iter;
48842b30 4152 struct ust_app *app;
48842b30 4153
fc34caaa 4154 assert(usess);
88e3c2f5 4155 assert(usess->active);
fc34caaa 4156 assert(uchan);
421cb601 4157
d9bf3ca4 4158 DBG2("UST app adding channel %s to UST domain for session id %" PRIu64,
a991f516 4159 uchan->name, usess->id);
48842b30
DG
4160
4161 rcu_read_lock();
5b4a0ec0 4162 /* For every registered applications */
88e3c2f5
JG
4163 cds_lfht_for_each_entry(ust_app_ht->ht, &iter, app, pid_n.node) {
4164 struct ust_app_session *ua_sess;
4165 int session_was_created = 0;
4166
4167 if (!app->compatible ||
4168 !trace_ust_pid_tracker_lookup(usess, app->pid)) {
4169 goto error_rcu_unlock;
a9ad0c8f
MD
4170 }
4171
edb67388
DG
4172 /*
4173 * Create session on the tracer side and add it to app session HT. Note
4174 * that if session exist, it will simply return a pointer to the ust
4175 * app session.
4176 */
88e3c2f5
JG
4177 ret = find_or_create_ust_app_session(usess, app, &ua_sess,
4178 &session_was_created);
3d8ca23b
DG
4179 if (ret < 0) {
4180 switch (ret) {
4181 case -ENOTCONN:
4182 /*
88e3c2f5
JG
4183 * The application's socket is not valid. Either a bad
4184 * socket or a timeout on it. We can't inform the caller
4185 * that for a specific app, the session failed so lets
4186 * continue here; it is not an error.
3d8ca23b 4187 */
88e3c2f5
JG
4188 ret = 0;
4189 goto error_rcu_unlock;
3d8ca23b
DG
4190 case -ENOMEM:
4191 default:
4192 goto error_rcu_unlock;
4193 }
48842b30 4194 }
b161602a
MD
4195
4196 if (ua_sess->deleted) {
b161602a
MD
4197 continue;
4198 }
88e3c2f5
JG
4199 ret = ust_app_channel_create(usess, ua_sess, uchan, app, NULL);
4200 if (ret) {
4201 if (session_was_created) {
d0b96690 4202 destroy_app_session(app, ua_sess);
3d8ca23b 4203 }
88e3c2f5 4204 goto error_rcu_unlock;
48842b30 4205 }
48842b30 4206 }
5b4a0ec0 4207
95e047ff 4208error_rcu_unlock:
48842b30 4209 rcu_read_unlock();
3c14c33f 4210 return ret;
48842b30
DG
4211}
4212
5b4a0ec0 4213/*
edb67388 4214 * Enable event for a specific session and channel on the tracer.
5b4a0ec0 4215 */
35a9059d 4216int ust_app_enable_event_glb(struct ltt_ust_session *usess,
48842b30
DG
4217 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
4218{
4219 int ret = 0;
bec39940 4220 struct lttng_ht_iter iter, uiter;
18eace3b 4221 struct lttng_ht_node_str *ua_chan_node;
48842b30
DG
4222 struct ust_app *app;
4223 struct ust_app_session *ua_sess;
4224 struct ust_app_channel *ua_chan;
4225 struct ust_app_event *ua_event;
48842b30 4226
88e3c2f5 4227 assert(usess->active);
d9bf3ca4 4228 DBG("UST app enabling event %s for all apps for session id %" PRIu64,
a991f516 4229 uevent->attr.name, usess->id);
48842b30 4230
edb67388
DG
4231 /*
4232 * NOTE: At this point, this function is called only if the session and
4233 * channel passed are already created for all apps. and enabled on the
4234 * tracer also.
4235 */
4236
48842b30 4237 rcu_read_lock();
421cb601
DG
4238
4239 /* For all registered applications */
852d0037 4240 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
4241 if (!app->compatible) {
4242 /*
4243 * TODO: In time, we should notice the caller of this error by
4244 * telling him that this is a version error.
4245 */
4246 continue;
4247 }
edb67388 4248 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
4249 if (!ua_sess) {
4250 /* The application has problem or is probably dead. */
4251 continue;
4252 }
ba767faf 4253
d0b96690
DG
4254 pthread_mutex_lock(&ua_sess->lock);
4255
b161602a
MD
4256 if (ua_sess->deleted) {
4257 pthread_mutex_unlock(&ua_sess->lock);
4258 continue;
4259 }
4260
edb67388 4261 /* Lookup channel in the ust app session */
bec39940
DG
4262 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
4263 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
a7169585
MD
4264 /*
4265 * It is possible that the channel cannot be found is
4266 * the channel/event creation occurs concurrently with
4267 * an application exit.
4268 */
4269 if (!ua_chan_node) {
4270 pthread_mutex_unlock(&ua_sess->lock);
4271 continue;
4272 }
edb67388
DG
4273
4274 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
4275
18eace3b
DG
4276 /* Get event node */
4277 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
39c5a3a7 4278 uevent->filter, uevent->attr.loglevel, uevent->exclusion);
18eace3b 4279 if (ua_event == NULL) {
7f79d3a1 4280 DBG3("UST app enable event %s not found for app PID %d."
852d0037 4281 "Skipping app", uevent->attr.name, app->pid);
d0b96690 4282 goto next_app;
35a9059d 4283 }
35a9059d
DG
4284
4285 ret = enable_ust_app_event(ua_sess, ua_event, app);
4286 if (ret < 0) {
d0b96690 4287 pthread_mutex_unlock(&ua_sess->lock);
7f79d3a1 4288 goto error;
48842b30 4289 }
d0b96690
DG
4290 next_app:
4291 pthread_mutex_unlock(&ua_sess->lock);
edb67388
DG
4292 }
4293
7f79d3a1 4294error:
edb67388 4295 rcu_read_unlock();
edb67388
DG
4296 return ret;
4297}
4298
4299/*
4300 * For a specific existing UST session and UST channel, creates the event for
4301 * all registered apps.
4302 */
35a9059d 4303int ust_app_create_event_glb(struct ltt_ust_session *usess,
edb67388
DG
4304 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
4305{
4306 int ret = 0;
bec39940
DG
4307 struct lttng_ht_iter iter, uiter;
4308 struct lttng_ht_node_str *ua_chan_node;
edb67388
DG
4309 struct ust_app *app;
4310 struct ust_app_session *ua_sess;
4311 struct ust_app_channel *ua_chan;
4312
88e3c2f5 4313 assert(usess->active);
d9bf3ca4 4314 DBG("UST app creating event %s for all apps for session id %" PRIu64,
a991f516 4315 uevent->attr.name, usess->id);
edb67388 4316
edb67388
DG
4317 rcu_read_lock();
4318
4319 /* For all registered applications */
852d0037 4320 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
4321 if (!app->compatible) {
4322 /*
4323 * TODO: In time, we should notice the caller of this error by
4324 * telling him that this is a version error.
4325 */
4326 continue;
4327 }
edb67388 4328 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
4329 if (!ua_sess) {
4330 /* The application has problem or is probably dead. */
4331 continue;
4332 }
48842b30 4333
d0b96690 4334 pthread_mutex_lock(&ua_sess->lock);
b161602a
MD
4335
4336 if (ua_sess->deleted) {
4337 pthread_mutex_unlock(&ua_sess->lock);
4338 continue;
4339 }
4340
48842b30 4341 /* Lookup channel in the ust app session */
bec39940
DG
4342 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
4343 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
4344 /* If the channel is not found, there is a code flow error */
4345 assert(ua_chan_node);
4346
48842b30
DG
4347 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
4348
edb67388 4349 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
d0b96690 4350 pthread_mutex_unlock(&ua_sess->lock);
edb67388 4351 if (ret < 0) {
49c336c1 4352 if (ret != -LTTNG_UST_ERR_EXIST) {
fc34caaa
DG
4353 /* Possible value at this point: -ENOMEM. If so, we stop! */
4354 break;
4355 }
4356 DBG2("UST app event %s already exist on app PID %d",
852d0037 4357 uevent->attr.name, app->pid);
5b4a0ec0 4358 continue;
48842b30 4359 }
48842b30 4360 }
5b4a0ec0 4361
48842b30 4362 rcu_read_unlock();
48842b30
DG
4363 return ret;
4364}
4365
5b4a0ec0
DG
4366/*
4367 * Start tracing for a specific UST session and app.
fad1ed2f
JR
4368 *
4369 * Called with UST app session lock held.
4370 *
5b4a0ec0 4371 */
b34cbebf 4372static
421cb601 4373int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
48842b30
DG
4374{
4375 int ret = 0;
48842b30 4376 struct ust_app_session *ua_sess;
48842b30 4377
852d0037 4378 DBG("Starting tracing for ust app pid %d", app->pid);
5cf5d0e7 4379
509cbaf8
MD
4380 rcu_read_lock();
4381
e0c7ec2b
DG
4382 if (!app->compatible) {
4383 goto end;
4384 }
4385
421cb601
DG
4386 ua_sess = lookup_session_by_app(usess, app);
4387 if (ua_sess == NULL) {
d42f20df
DG
4388 /* The session is in teardown process. Ignore and continue. */
4389 goto end;
421cb601 4390 }
48842b30 4391
d0b96690
DG
4392 pthread_mutex_lock(&ua_sess->lock);
4393
b161602a
MD
4394 if (ua_sess->deleted) {
4395 pthread_mutex_unlock(&ua_sess->lock);
4396 goto end;
4397 }
4398
aea829b3
DG
4399 /* Upon restart, we skip the setup, already done */
4400 if (ua_sess->started) {
8be98f9a 4401 goto skip_setup;
aea829b3 4402 }
8be98f9a 4403
d65d2de8
DG
4404 /*
4405 * Create the metadata for the application. This returns gracefully if a
4406 * metadata was already set for the session.
4407 */
ad7a9107 4408 ret = create_ust_app_metadata(ua_sess, app, usess->consumer);
421cb601 4409 if (ret < 0) {
d0b96690 4410 goto error_unlock;
421cb601 4411 }
48842b30 4412
840cb59c 4413 health_code_update();
86acf0da 4414
8be98f9a 4415skip_setup:
421cb601 4416 /* This start the UST tracing */
fb45065e 4417 pthread_mutex_lock(&app->sock_lock);
852d0037 4418 ret = ustctl_start_session(app->sock, ua_sess->handle);
fb45065e 4419 pthread_mutex_unlock(&app->sock_lock);
421cb601 4420 if (ret < 0) {
ffe60014
DG
4421 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4422 ERR("Error starting tracing for app pid: %d (ret: %d)",
4423 app->pid, ret);
4424 } else {
4425 DBG("UST app start session failed. Application is dead.");
3757b385
DG
4426 /*
4427 * This is normal behavior, an application can die during the
4428 * creation process. Don't report an error so the execution can
4429 * continue normally.
4430 */
4431 pthread_mutex_unlock(&ua_sess->lock);
4432 goto end;
ffe60014 4433 }
d0b96690 4434 goto error_unlock;
421cb601 4435 }
5b4a0ec0 4436
55c3953d
DG
4437 /* Indicate that the session has been started once */
4438 ua_sess->started = 1;
4439
d0b96690
DG
4440 pthread_mutex_unlock(&ua_sess->lock);
4441
840cb59c 4442 health_code_update();
86acf0da 4443
421cb601 4444 /* Quiescent wait after starting trace */
fb45065e 4445 pthread_mutex_lock(&app->sock_lock);
ffe60014 4446 ret = ustctl_wait_quiescent(app->sock);
fb45065e 4447 pthread_mutex_unlock(&app->sock_lock);
ffe60014
DG
4448 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4449 ERR("UST app wait quiescent failed for app pid %d ret %d",
4450 app->pid, ret);
4451 }
48842b30 4452
e0c7ec2b
DG
4453end:
4454 rcu_read_unlock();
840cb59c 4455 health_code_update();
421cb601 4456 return 0;
48842b30 4457
d0b96690
DG
4458error_unlock:
4459 pthread_mutex_unlock(&ua_sess->lock);
509cbaf8 4460 rcu_read_unlock();
840cb59c 4461 health_code_update();
421cb601
DG
4462 return -1;
4463}
48842b30 4464
8be98f9a
MD
4465/*
4466 * Stop tracing for a specific UST session and app.
4467 */
b34cbebf 4468static
8be98f9a
MD
4469int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
4470{
4471 int ret = 0;
4472 struct ust_app_session *ua_sess;
7972aab2 4473 struct ust_registry_session *registry;
8be98f9a 4474
852d0037 4475 DBG("Stopping tracing for ust app pid %d", app->pid);
8be98f9a
MD
4476
4477 rcu_read_lock();
4478
e0c7ec2b 4479 if (!app->compatible) {
d88aee68 4480 goto end_no_session;
e0c7ec2b
DG
4481 }
4482
8be98f9a
MD
4483 ua_sess = lookup_session_by_app(usess, app);
4484 if (ua_sess == NULL) {
d88aee68 4485 goto end_no_session;
8be98f9a
MD
4486 }
4487
d88aee68
DG
4488 pthread_mutex_lock(&ua_sess->lock);
4489
b161602a
MD
4490 if (ua_sess->deleted) {
4491 pthread_mutex_unlock(&ua_sess->lock);
4492 goto end_no_session;
4493 }
4494
9bc07046
DG
4495 /*
4496 * If started = 0, it means that stop trace has been called for a session
c45536e1
DG
4497 * that was never started. It's possible since we can have a fail start
4498 * from either the application manager thread or the command thread. Simply
4499 * indicate that this is a stop error.
9bc07046 4500 */
f9dfc3d9 4501 if (!ua_sess->started) {
c45536e1
DG
4502 goto error_rcu_unlock;
4503 }
7db205b5 4504
840cb59c 4505 health_code_update();
86acf0da 4506
9d6c7d3f 4507 /* This inhibits UST tracing */
fb45065e 4508 pthread_mutex_lock(&app->sock_lock);
852d0037 4509 ret = ustctl_stop_session(app->sock, ua_sess->handle);
fb45065e 4510 pthread_mutex_unlock(&app->sock_lock);
9d6c7d3f 4511 if (ret < 0) {
ffe60014
DG
4512 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4513 ERR("Error stopping tracing for app pid: %d (ret: %d)",
4514 app->pid, ret);
4515 } else {
4516 DBG("UST app stop session failed. Application is dead.");
3757b385
DG
4517 /*
4518 * This is normal behavior, an application can die during the
4519 * creation process. Don't report an error so the execution can
4520 * continue normally.
4521 */
4522 goto end_unlock;
ffe60014 4523 }
9d6c7d3f
DG
4524 goto error_rcu_unlock;
4525 }
4526
840cb59c 4527 health_code_update();
86acf0da 4528
9d6c7d3f 4529 /* Quiescent wait after stopping trace */
fb45065e 4530 pthread_mutex_lock(&app->sock_lock);
ffe60014 4531 ret = ustctl_wait_quiescent(app->sock);
fb45065e 4532 pthread_mutex_unlock(&app->sock_lock);
ffe60014
DG
4533 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4534 ERR("UST app wait quiescent failed for app pid %d ret %d",
4535 app->pid, ret);
4536 }
9d6c7d3f 4537
840cb59c 4538 health_code_update();
86acf0da 4539
b34cbebf 4540 registry = get_session_registry(ua_sess);
fad1ed2f
JR
4541
4542 /* The UST app session is held registry shall not be null. */
b34cbebf 4543 assert(registry);
1b532a60 4544
ce34fcd0
MD
4545 /* Push metadata for application before freeing the application. */
4546 (void) push_metadata(registry, ua_sess->consumer);
b34cbebf 4547
3757b385 4548end_unlock:
b34cbebf
MD
4549 pthread_mutex_unlock(&ua_sess->lock);
4550end_no_session:
4551 rcu_read_unlock();
4552 health_code_update();
4553 return 0;
4554
4555error_rcu_unlock:
4556 pthread_mutex_unlock(&ua_sess->lock);
4557 rcu_read_unlock();
4558 health_code_update();
4559 return -1;
4560}
4561
b34cbebf 4562static
c4b88406
MD
4563int ust_app_flush_app_session(struct ust_app *app,
4564 struct ust_app_session *ua_sess)
b34cbebf 4565{
c4b88406 4566 int ret, retval = 0;
b34cbebf 4567 struct lttng_ht_iter iter;
b34cbebf 4568 struct ust_app_channel *ua_chan;
c4b88406 4569 struct consumer_socket *socket;
b34cbebf 4570
c4b88406 4571 DBG("Flushing app session buffers for ust app pid %d", app->pid);
b34cbebf
MD
4572
4573 rcu_read_lock();
4574
4575 if (!app->compatible) {
c4b88406 4576 goto end_not_compatible;
b34cbebf
MD
4577 }
4578
4579 pthread_mutex_lock(&ua_sess->lock);
4580
b161602a
MD
4581 if (ua_sess->deleted) {
4582 goto end_deleted;
4583 }
4584
b34cbebf
MD
4585 health_code_update();
4586
9d6c7d3f 4587 /* Flushing buffers */
c4b88406
MD
4588 socket = consumer_find_socket_by_bitness(app->bits_per_long,
4589 ua_sess->consumer);
ce34fcd0
MD
4590
4591 /* Flush buffers and push metadata. */
4592 switch (ua_sess->buffer_type) {
4593 case LTTNG_BUFFER_PER_PID:
4594 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
4595 node.node) {
4596 health_code_update();
ce34fcd0
MD
4597 ret = consumer_flush_channel(socket, ua_chan->key);
4598 if (ret) {
4599 ERR("Error flushing consumer channel");
4600 retval = -1;
4601 continue;
4602 }
8be98f9a 4603 }
ce34fcd0
MD
4604 break;
4605 case LTTNG_BUFFER_PER_UID:
4606 default:
4607 assert(0);
4608 break;
8be98f9a 4609 }
8be98f9a 4610
840cb59c 4611 health_code_update();
86acf0da 4612
b161602a 4613end_deleted:
d88aee68 4614 pthread_mutex_unlock(&ua_sess->lock);
ce34fcd0 4615
c4b88406
MD
4616end_not_compatible:
4617 rcu_read_unlock();
4618 health_code_update();
4619 return retval;
4620}
4621
4622/*
ce34fcd0
MD
4623 * Flush buffers for all applications for a specific UST session.
4624 * Called with UST session lock held.
c4b88406
MD
4625 */
4626static
ce34fcd0 4627int ust_app_flush_session(struct ltt_ust_session *usess)
c4b88406
MD
4628
4629{
99b1411c 4630 int ret = 0;
c4b88406 4631
ce34fcd0 4632 DBG("Flushing session buffers for all ust apps");
c4b88406
MD
4633
4634 rcu_read_lock();
4635
ce34fcd0
MD
4636 /* Flush buffers and push metadata. */
4637 switch (usess->buffer_type) {
4638 case LTTNG_BUFFER_PER_UID:
4639 {
4640 struct buffer_reg_uid *reg;
4641 struct lttng_ht_iter iter;
4642
4643 /* Flush all per UID buffers associated to that session. */
4644 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
4645 struct ust_registry_session *ust_session_reg;
4646 struct buffer_reg_channel *reg_chan;
4647 struct consumer_socket *socket;
4648
4649 /* Get consumer socket to use to push the metadata.*/
4650 socket = consumer_find_socket_by_bitness(reg->bits_per_long,
4651 usess->consumer);
4652 if (!socket) {
4653 /* Ignore request if no consumer is found for the session. */
4654 continue;
4655 }
4656
4657 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
4658 reg_chan, node.node) {
4659 /*
4660 * The following call will print error values so the return
4661 * code is of little importance because whatever happens, we
4662 * have to try them all.
4663 */
4664 (void) consumer_flush_channel(socket, reg_chan->consumer_key);
4665 }
4666
4667 ust_session_reg = reg->registry->reg.ust;
4668 /* Push metadata. */
4669 (void) push_metadata(ust_session_reg, usess->consumer);
4670 }
ce34fcd0
MD
4671 break;
4672 }
4673 case LTTNG_BUFFER_PER_PID:
4674 {
4675 struct ust_app_session *ua_sess;
4676 struct lttng_ht_iter iter;
4677 struct ust_app *app;
4678
4679 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4680 ua_sess = lookup_session_by_app(usess, app);
4681 if (ua_sess == NULL) {
4682 continue;
4683 }
4684 (void) ust_app_flush_app_session(app, ua_sess);
4685 }
4686 break;
4687 }
4688 default:
99b1411c 4689 ret = -1;
ce34fcd0
MD
4690 assert(0);
4691 break;
c4b88406 4692 }
c4b88406 4693
7db205b5 4694 rcu_read_unlock();
840cb59c 4695 health_code_update();
c4b88406 4696 return ret;
8be98f9a
MD
4697}
4698
0dd01979
MD
4699static
4700int ust_app_clear_quiescent_app_session(struct ust_app *app,
4701 struct ust_app_session *ua_sess)
4702{
4703 int ret = 0;
4704 struct lttng_ht_iter iter;
4705 struct ust_app_channel *ua_chan;
4706 struct consumer_socket *socket;
4707
4708 DBG("Clearing stream quiescent state for ust app pid %d", app->pid);
4709
4710 rcu_read_lock();
4711
4712 if (!app->compatible) {
4713 goto end_not_compatible;
4714 }
4715
4716 pthread_mutex_lock(&ua_sess->lock);
4717
4718 if (ua_sess->deleted) {
4719 goto end_unlock;
4720 }
4721
4722 health_code_update();
4723
4724 socket = consumer_find_socket_by_bitness(app->bits_per_long,
4725 ua_sess->consumer);
4726 if (!socket) {
4727 ERR("Failed to find consumer (%" PRIu32 ") socket",
4728 app->bits_per_long);
4729 ret = -1;
4730 goto end_unlock;
4731 }
4732
4733 /* Clear quiescent state. */
4734 switch (ua_sess->buffer_type) {
4735 case LTTNG_BUFFER_PER_PID:
4736 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter,
4737 ua_chan, node.node) {
4738 health_code_update();
4739 ret = consumer_clear_quiescent_channel(socket,
4740 ua_chan->key);
4741 if (ret) {
4742 ERR("Error clearing quiescent state for consumer channel");
4743 ret = -1;
4744 continue;
4745 }
4746 }
4747 break;
4748 case LTTNG_BUFFER_PER_UID:
4749 default:
4750 assert(0);
4751 ret = -1;
4752 break;
4753 }
4754
4755 health_code_update();
4756
4757end_unlock:
4758 pthread_mutex_unlock(&ua_sess->lock);
4759
4760end_not_compatible:
4761 rcu_read_unlock();
4762 health_code_update();
4763 return ret;
4764}
4765
4766/*
4767 * Clear quiescent state in each stream for all applications for a
4768 * specific UST session.
4769 * Called with UST session lock held.
4770 */
4771static
4772int ust_app_clear_quiescent_session(struct ltt_ust_session *usess)
4773
4774{
4775 int ret = 0;
4776
4777 DBG("Clearing stream quiescent state for all ust apps");
4778
4779 rcu_read_lock();
4780
4781 switch (usess->buffer_type) {
4782 case LTTNG_BUFFER_PER_UID:
4783 {
4784 struct lttng_ht_iter iter;
4785 struct buffer_reg_uid *reg;
4786
4787 /*
4788 * Clear quiescent for all per UID buffers associated to
4789 * that session.
4790 */
4791 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
4792 struct consumer_socket *socket;
4793 struct buffer_reg_channel *reg_chan;
4794
4795 /* Get associated consumer socket.*/
4796 socket = consumer_find_socket_by_bitness(
4797 reg->bits_per_long, usess->consumer);
4798 if (!socket) {
4799 /*
4800 * Ignore request if no consumer is found for
4801 * the session.
4802 */
4803 continue;
4804 }
4805
4806 cds_lfht_for_each_entry(reg->registry->channels->ht,
4807 &iter.iter, reg_chan, node.node) {
4808 /*
4809 * The following call will print error values so
4810 * the return code is of little importance
4811 * because whatever happens, we have to try them
4812 * all.
4813 */
4814 (void) consumer_clear_quiescent_channel(socket,
4815 reg_chan->consumer_key);
4816 }
4817 }
4818 break;
4819 }
4820 case LTTNG_BUFFER_PER_PID:
4821 {
4822 struct ust_app_session *ua_sess;
4823 struct lttng_ht_iter iter;
4824 struct ust_app *app;
4825
4826 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app,
4827 pid_n.node) {
4828 ua_sess = lookup_session_by_app(usess, app);
4829 if (ua_sess == NULL) {
4830 continue;
4831 }
4832 (void) ust_app_clear_quiescent_app_session(app,
4833 ua_sess);
4834 }
4835 break;
4836 }
4837 default:
4838 ret = -1;
4839 assert(0);
4840 break;
4841 }
4842
4843 rcu_read_unlock();
4844 health_code_update();
4845 return ret;
4846}
4847
84cd17c6
MD
4848/*
4849 * Destroy a specific UST session in apps.
4850 */
3353de95 4851static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
84cd17c6 4852{
ffe60014 4853 int ret;
84cd17c6 4854 struct ust_app_session *ua_sess;
bec39940 4855 struct lttng_ht_iter iter;
d9bf3ca4 4856 struct lttng_ht_node_u64 *node;
84cd17c6 4857
852d0037 4858 DBG("Destroy tracing for ust app pid %d", app->pid);
84cd17c6
MD
4859
4860 rcu_read_lock();
4861
e0c7ec2b
DG
4862 if (!app->compatible) {
4863 goto end;
4864 }
4865
84cd17c6 4866 __lookup_session_by_app(usess, app, &iter);
d9bf3ca4 4867 node = lttng_ht_iter_get_node_u64(&iter);
84cd17c6 4868 if (node == NULL) {
d42f20df
DG
4869 /* Session is being or is deleted. */
4870 goto end;
84cd17c6
MD
4871 }
4872 ua_sess = caa_container_of(node, struct ust_app_session, node);
c4a1715b 4873
840cb59c 4874 health_code_update();
d0b96690 4875 destroy_app_session(app, ua_sess);
84cd17c6 4876
840cb59c 4877 health_code_update();
7db205b5 4878
84cd17c6 4879 /* Quiescent wait after stopping trace */
fb45065e 4880 pthread_mutex_lock(&app->sock_lock);
ffe60014 4881 ret = ustctl_wait_quiescent(app->sock);
fb45065e 4882 pthread_mutex_unlock(&app->sock_lock);
ffe60014
DG
4883 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4884 ERR("UST app wait quiescent failed for app pid %d ret %d",
4885 app->pid, ret);
4886 }
e0c7ec2b
DG
4887end:
4888 rcu_read_unlock();
840cb59c 4889 health_code_update();
84cd17c6 4890 return 0;
84cd17c6
MD
4891}
4892
5b4a0ec0
DG
4893/*
4894 * Start tracing for the UST session.
4895 */
421cb601
DG
4896int ust_app_start_trace_all(struct ltt_ust_session *usess)
4897{
bec39940 4898 struct lttng_ht_iter iter;
421cb601 4899 struct ust_app *app;
48842b30 4900
421cb601
DG
4901 DBG("Starting all UST traces");
4902
bb2452c8
MD
4903 /*
4904 * Even though the start trace might fail, flag this session active so
4905 * other application coming in are started by default.
4906 */
4907 usess->active = 1;
4908
421cb601 4909 rcu_read_lock();
421cb601 4910
0dd01979
MD
4911 /*
4912 * In a start-stop-start use-case, we need to clear the quiescent state
4913 * of each channel set by the prior stop command, thus ensuring that a
4914 * following stop or destroy is sure to grab a timestamp_end near those
4915 * operations, even if the packet is empty.
4916 */
4917 (void) ust_app_clear_quiescent_session(usess);
4918
0498a00c
MD
4919 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4920 ust_app_global_update(usess, app);
4921 }
4922
48842b30
DG
4923 rcu_read_unlock();
4924
4925 return 0;
4926}
487cf67c 4927
8be98f9a
MD
4928/*
4929 * Start tracing for the UST session.
ce34fcd0 4930 * Called with UST session lock held.
8be98f9a
MD
4931 */
4932int ust_app_stop_trace_all(struct ltt_ust_session *usess)
4933{
4934 int ret = 0;
bec39940 4935 struct lttng_ht_iter iter;
8be98f9a
MD
4936 struct ust_app *app;
4937
4938 DBG("Stopping all UST traces");
4939
bb2452c8
MD
4940 /*
4941 * Even though the stop trace might fail, flag this session inactive so
4942 * other application coming in are not started by default.
4943 */
4944 usess->active = 0;
4945
8be98f9a
MD
4946 rcu_read_lock();
4947
b34cbebf
MD
4948 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4949 ret = ust_app_stop_trace(usess, app);
4950 if (ret < 0) {
4951 /* Continue to next apps even on error */
4952 continue;
4953 }
4954 }
4955
ce34fcd0 4956 (void) ust_app_flush_session(usess);
8be98f9a
MD
4957
4958 rcu_read_unlock();
4959
4960 return 0;
4961}
4962
84cd17c6
MD
4963/*
4964 * Destroy app UST session.
4965 */
4966int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
4967{
4968 int ret = 0;
bec39940 4969 struct lttng_ht_iter iter;
84cd17c6
MD
4970 struct ust_app *app;
4971
4972 DBG("Destroy all UST traces");
4973
4974 rcu_read_lock();
4975
852d0037 4976 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
3353de95 4977 ret = destroy_trace(usess, app);
84cd17c6
MD
4978 if (ret < 0) {
4979 /* Continue to next apps even on error */
4980 continue;
4981 }
4982 }
4983
4984 rcu_read_unlock();
4985
4986 return 0;
4987}
4988
88e3c2f5 4989/* The ua_sess lock must be held by the caller. */
a9ad0c8f 4990static
88e3c2f5
JG
4991int find_or_create_ust_app_channel(
4992 struct ltt_ust_session *usess,
4993 struct ust_app_session *ua_sess,
4994 struct ust_app *app,
4995 struct ltt_ust_channel *uchan,
4996 struct ust_app_channel **ua_chan)
487cf67c 4997{
55c54cce 4998 int ret = 0;
88e3c2f5
JG
4999 struct lttng_ht_iter iter;
5000 struct lttng_ht_node_str *ua_chan_node;
5001
5002 lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &iter);
5003 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
5004 if (ua_chan_node) {
5005 *ua_chan = caa_container_of(ua_chan_node,
5006 struct ust_app_channel, node);
5007 goto end;
5008 }
5009
5010 ret = ust_app_channel_create(usess, ua_sess, uchan, app, ua_chan);
5011 if (ret) {
5012 goto end;
5013 }
5014end:
5015 return ret;
5016}
5017
5018static
5019int ust_app_channel_synchronize_event(struct ust_app_channel *ua_chan,
5020 struct ltt_ust_event *uevent, struct ust_app_session *ua_sess,
5021 struct ust_app *app)
5022{
5023 int ret = 0;
5024 struct ust_app_event *ua_event = NULL;
5025
5026 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
5027 uevent->filter, uevent->attr.loglevel, uevent->exclusion);
5028 if (!ua_event) {
5029 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
5030 if (ret < 0) {
5031 goto end;
5032 }
5033 } else {
5034 if (ua_event->enabled != uevent->enabled) {
5035 ret = uevent->enabled ?
5036 enable_ust_app_event(ua_sess, ua_event, app) :
5037 disable_ust_app_event(ua_sess, ua_event, app);
5038 }
5039 }
5040
5041end:
5042 return ret;
5043}
5044
5045/*
5046 * The caller must ensure that the application is compatible and is tracked
5047 * by the PID tracker.
5048 */
5049static
5050void ust_app_synchronize(struct ltt_ust_session *usess,
5051 struct ust_app *app)
5052{
5053 int ret = 0;
5054 struct cds_lfht_iter uchan_iter;
5055 struct ltt_ust_channel *uchan;
3d8ca23b 5056 struct ust_app_session *ua_sess = NULL;
1f3580c7 5057
88e3c2f5
JG
5058 /*
5059 * The application's configuration should only be synchronized for
5060 * active sessions.
5061 */
5062 assert(usess->active);
5063
5064 ret = find_or_create_ust_app_session(usess, app, &ua_sess, NULL);
3d8ca23b
DG
5065 if (ret < 0) {
5066 /* Tracer is probably gone or ENOMEM. */
487cf67c
DG
5067 goto error;
5068 }
3d8ca23b 5069 assert(ua_sess);
487cf67c 5070
d0b96690 5071 pthread_mutex_lock(&ua_sess->lock);
b161602a
MD
5072 if (ua_sess->deleted) {
5073 pthread_mutex_unlock(&ua_sess->lock);
5074 goto end;
5075 }
5076
88e3c2f5
JG
5077 rcu_read_lock();
5078 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &uchan_iter,
5079 uchan, node.node) {
5080 struct ust_app_channel *ua_chan;
5081 struct cds_lfht_iter uevent_iter;
5082 struct ltt_ust_event *uevent;
487cf67c 5083
31746f93 5084 /*
88e3c2f5
JG
5085 * Search for a matching ust_app_channel. If none is found,
5086 * create it. Creating the channel will cause the ua_chan
5087 * structure to be allocated, the channel buffers to be
5088 * allocated (if necessary) and sent to the application, and
5089 * all enabled contexts will be added to the channel.
31746f93 5090 */
88e3c2f5
JG
5091 ret = find_or_create_ust_app_channel(usess, ua_sess,
5092 app, uchan, &ua_chan);
5093 if (ret) {
5094 /* Tracer is probably gone or ENOMEM. */
5095 goto error_unlock;
727d5404
DG
5096 }
5097
88e3c2f5
JG
5098 if (!ua_chan) {
5099 /* ua_chan will be NULL for the metadata channel */
5100 continue;
5101 }
727d5404 5102
88e3c2f5 5103 cds_lfht_for_each_entry(uchan->events->ht, &uevent_iter, uevent,
bec39940 5104 node.node) {
88e3c2f5
JG
5105 ret = ust_app_channel_synchronize_event(ua_chan,
5106 uevent, ua_sess, app);
5107 if (ret) {
d0b96690 5108 goto error_unlock;
487cf67c 5109 }
36dc12cc 5110 }
d0b96690 5111
88e3c2f5
JG
5112 if (ua_chan->enabled != uchan->enabled) {
5113 ret = uchan->enabled ?
5114 enable_ust_app_channel(ua_sess, uchan, app) :
5115 disable_ust_app_channel(ua_sess, ua_chan, app);
5116 if (ret) {
5117 goto error_unlock;
5118 }
5119 }
36dc12cc 5120 }
88e3c2f5 5121 rcu_read_unlock();
0498a00c 5122
a9ad0c8f 5123end:
88e3c2f5 5124 pthread_mutex_unlock(&ua_sess->lock);
ffe60014 5125 /* Everything went well at this point. */
ffe60014
DG
5126 return;
5127
d0b96690 5128error_unlock:
88e3c2f5 5129 rcu_read_unlock();
d0b96690 5130 pthread_mutex_unlock(&ua_sess->lock);
487cf67c 5131error:
ffe60014 5132 if (ua_sess) {
d0b96690 5133 destroy_app_session(app, ua_sess);
ffe60014 5134 }
487cf67c
DG
5135 return;
5136}
55cc08a6 5137
a9ad0c8f
MD
5138static
5139void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app)
5140{
5141 struct ust_app_session *ua_sess;
5142
5143 ua_sess = lookup_session_by_app(usess, app);
5144 if (ua_sess == NULL) {
5145 return;
5146 }
5147 destroy_app_session(app, ua_sess);
5148}
5149
5150/*
5151 * Add channels/events from UST global domain to registered apps at sock.
5152 *
5153 * Called with session lock held.
5154 * Called with RCU read-side lock held.
5155 */
5156void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app)
5157{
5158 assert(usess);
88e3c2f5 5159 assert(usess->active);
a9ad0c8f
MD
5160
5161 DBG2("UST app global update for app sock %d for session id %" PRIu64,
5162 app->sock, usess->id);
5163
5164 if (!app->compatible) {
5165 return;
5166 }
a9ad0c8f 5167 if (trace_ust_pid_tracker_lookup(usess, app->pid)) {
88e3c2f5
JG
5168 /*
5169 * Synchronize the application's internal tracing configuration
5170 * and start tracing.
5171 */
5172 ust_app_synchronize(usess, app);
5173 ust_app_start_trace(usess, app);
a9ad0c8f
MD
5174 } else {
5175 ust_app_global_destroy(usess, app);
5176 }
5177}
5178
5179/*
5180 * Called with session lock held.
5181 */
5182void ust_app_global_update_all(struct ltt_ust_session *usess)
5183{
5184 struct lttng_ht_iter iter;
5185 struct ust_app *app;
5186
5187 rcu_read_lock();
5188 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
5189 ust_app_global_update(usess, app);
5190 }
5191 rcu_read_unlock();
5192}
5193
55cc08a6
DG
5194/*
5195 * Add context to a specific channel for global UST domain.
5196 */
5197int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
5198 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
5199{
5200 int ret = 0;
bec39940
DG
5201 struct lttng_ht_node_str *ua_chan_node;
5202 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
5203 struct ust_app_channel *ua_chan = NULL;
5204 struct ust_app_session *ua_sess;
5205 struct ust_app *app;
5206
88e3c2f5 5207 assert(usess->active);
0498a00c 5208
55cc08a6 5209 rcu_read_lock();
852d0037 5210 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
5211 if (!app->compatible) {
5212 /*
5213 * TODO: In time, we should notice the caller of this error by
5214 * telling him that this is a version error.
5215 */
5216 continue;
5217 }
55cc08a6
DG
5218 ua_sess = lookup_session_by_app(usess, app);
5219 if (ua_sess == NULL) {
5220 continue;
5221 }
5222
d0b96690 5223 pthread_mutex_lock(&ua_sess->lock);
b161602a
MD
5224
5225 if (ua_sess->deleted) {
5226 pthread_mutex_unlock(&ua_sess->lock);
5227 continue;
5228 }
5229
55cc08a6 5230 /* Lookup channel in the ust app session */
bec39940
DG
5231 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
5232 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6 5233 if (ua_chan_node == NULL) {
d0b96690 5234 goto next_app;
55cc08a6
DG
5235 }
5236 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
5237 node);
c9edf082 5238 ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app);
55cc08a6 5239 if (ret < 0) {
d0b96690 5240 goto next_app;
55cc08a6 5241 }
d0b96690
DG
5242 next_app:
5243 pthread_mutex_unlock(&ua_sess->lock);
55cc08a6
DG
5244 }
5245
55cc08a6 5246 rcu_read_unlock();
76d45b40
DG
5247 return ret;
5248}
7f79d3a1 5249
d0b96690
DG
5250/*
5251 * Receive registration and populate the given msg structure.
5252 *
5253 * On success return 0 else a negative value returned by the ustctl call.
5254 */
5255int ust_app_recv_registration(int sock, struct ust_register_msg *msg)
5256{
5257 int ret;
5258 uint32_t pid, ppid, uid, gid;
5259
5260 assert(msg);
5261
5262 ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor,
5263 &pid, &ppid, &uid, &gid,
5264 &msg->bits_per_long,
5265 &msg->uint8_t_alignment,
5266 &msg->uint16_t_alignment,
5267 &msg->uint32_t_alignment,
5268 &msg->uint64_t_alignment,
5269 &msg->long_alignment,
5270 &msg->byte_order,
5271 msg->name);
5272 if (ret < 0) {
5273 switch (-ret) {
5274 case EPIPE:
5275 case ECONNRESET:
5276 case LTTNG_UST_ERR_EXITING:
5277 DBG3("UST app recv reg message failed. Application died");
5278 break;
5279 case LTTNG_UST_ERR_UNSUP_MAJOR:
5280 ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d",
5281 msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION,
5282 LTTNG_UST_ABI_MINOR_VERSION);
5283 break;
5284 default:
5285 ERR("UST app recv reg message failed with ret %d", ret);
5286 break;
5287 }
5288 goto error;
5289 }
5290 msg->pid = (pid_t) pid;
5291 msg->ppid = (pid_t) ppid;
5292 msg->uid = (uid_t) uid;
5293 msg->gid = (gid_t) gid;
5294
5295error:
5296 return ret;
5297}
5298
10b56aef
MD
5299/*
5300 * Return a ust app session object using the application object and the
5301 * session object descriptor has a key. If not found, NULL is returned.
5302 * A RCU read side lock MUST be acquired when calling this function.
5303*/
5304static struct ust_app_session *find_session_by_objd(struct ust_app *app,
5305 int objd)
5306{
5307 struct lttng_ht_node_ulong *node;
5308 struct lttng_ht_iter iter;
5309 struct ust_app_session *ua_sess = NULL;
5310
5311 assert(app);
5312
5313 lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter);
5314 node = lttng_ht_iter_get_node_ulong(&iter);
5315 if (node == NULL) {
5316 DBG2("UST app session find by objd %d not found", objd);
5317 goto error;
5318 }
5319
5320 ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node);
5321
5322error:
5323 return ua_sess;
5324}
5325
d88aee68
DG
5326/*
5327 * Return a ust app channel object using the application object and the channel
5328 * object descriptor has a key. If not found, NULL is returned. A RCU read side
5329 * lock MUST be acquired before calling this function.
5330 */
d0b96690
DG
5331static struct ust_app_channel *find_channel_by_objd(struct ust_app *app,
5332 int objd)
5333{
5334 struct lttng_ht_node_ulong *node;
5335 struct lttng_ht_iter iter;
5336 struct ust_app_channel *ua_chan = NULL;
5337
5338 assert(app);
5339
5340 lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter);
5341 node = lttng_ht_iter_get_node_ulong(&iter);
5342 if (node == NULL) {
5343 DBG2("UST app channel find by objd %d not found", objd);
5344 goto error;
5345 }
5346
5347 ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node);
5348
5349error:
5350 return ua_chan;
5351}
5352
d88aee68
DG
5353/*
5354 * Reply to a register channel notification from an application on the notify
5355 * socket. The channel metadata is also created.
5356 *
5357 * The session UST registry lock is acquired in this function.
5358 *
5359 * On success 0 is returned else a negative value.
5360 */
8eede835 5361static int reply_ust_register_channel(int sock, int cobjd,
d0b96690
DG
5362 size_t nr_fields, struct ustctl_field *fields)
5363{
5364 int ret, ret_code = 0;
294e218e 5365 uint32_t chan_id;
7972aab2 5366 uint64_t chan_reg_key;
d0b96690
DG
5367 enum ustctl_channel_header type;
5368 struct ust_app *app;
5369 struct ust_app_channel *ua_chan;
5370 struct ust_app_session *ua_sess;
7972aab2 5371 struct ust_registry_session *registry;
45893984 5372 struct ust_registry_channel *chan_reg;
d0b96690
DG
5373
5374 rcu_read_lock();
5375
5376 /* Lookup application. If not found, there is a code flow error. */
5377 app = find_app_by_notify_sock(sock);
d88aee68 5378 if (!app) {
fad1ed2f 5379 DBG("Application socket %d is being torn down. Abort event notify",
d88aee68
DG
5380 sock);
5381 ret = 0;
5382 goto error_rcu_unlock;
5383 }
d0b96690 5384
4950b860 5385 /* Lookup channel by UST object descriptor. */
d0b96690 5386 ua_chan = find_channel_by_objd(app, cobjd);
4950b860 5387 if (!ua_chan) {
fad1ed2f 5388 DBG("Application channel is being torn down. Abort event notify");
4950b860
MD
5389 ret = 0;
5390 goto error_rcu_unlock;
5391 }
5392
d0b96690
DG
5393 assert(ua_chan->session);
5394 ua_sess = ua_chan->session;
d0b96690 5395
7972aab2
DG
5396 /* Get right session registry depending on the session buffer type. */
5397 registry = get_session_registry(ua_sess);
fad1ed2f
JR
5398 if (!registry) {
5399 DBG("Application session is being torn down. Abort event notify");
5400 ret = 0;
5401 goto error_rcu_unlock;
5402 };
45893984 5403
7972aab2
DG
5404 /* Depending on the buffer type, a different channel key is used. */
5405 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) {
5406 chan_reg_key = ua_chan->tracing_channel_id;
d0b96690 5407 } else {
7972aab2 5408 chan_reg_key = ua_chan->key;
d0b96690
DG
5409 }
5410
7972aab2
DG
5411 pthread_mutex_lock(&registry->lock);
5412
5413 chan_reg = ust_registry_channel_find(registry, chan_reg_key);
5414 assert(chan_reg);
5415
5416 if (!chan_reg->register_done) {
294e218e
MD
5417 /*
5418 * TODO: eventually use the registry event count for
5419 * this channel to better guess header type for per-pid
5420 * buffers.
5421 */
5422 type = USTCTL_CHANNEL_HEADER_LARGE;
7972aab2
DG
5423 chan_reg->nr_ctx_fields = nr_fields;
5424 chan_reg->ctx_fields = fields;
fad1ed2f 5425 fields = NULL;
7972aab2 5426 chan_reg->header_type = type;
d0b96690 5427 } else {
7972aab2
DG
5428 /* Get current already assigned values. */
5429 type = chan_reg->header_type;
d0b96690 5430 }
7972aab2
DG
5431 /* Channel id is set during the object creation. */
5432 chan_id = chan_reg->chan_id;
d0b96690
DG
5433
5434 /* Append to metadata */
7972aab2
DG
5435 if (!chan_reg->metadata_dumped) {
5436 ret_code = ust_metadata_channel_statedump(registry, chan_reg);
d0b96690
DG
5437 if (ret_code) {
5438 ERR("Error appending channel metadata (errno = %d)", ret_code);
5439 goto reply;
5440 }
5441 }
5442
5443reply:
7972aab2
DG
5444 DBG3("UST app replying to register channel key %" PRIu64
5445 " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type,
5446 ret_code);
d0b96690
DG
5447
5448 ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code);
5449 if (ret < 0) {
5450 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
5451 ERR("UST app reply channel failed with ret %d", ret);
5452 } else {
5453 DBG3("UST app reply channel failed. Application died");
5454 }
5455 goto error;
5456 }
5457
7972aab2
DG
5458 /* This channel registry registration is completed. */
5459 chan_reg->register_done = 1;
5460
d0b96690 5461error:
7972aab2 5462 pthread_mutex_unlock(&registry->lock);
d88aee68 5463error_rcu_unlock:
d0b96690 5464 rcu_read_unlock();
fad1ed2f 5465 free(fields);
d0b96690
DG
5466 return ret;
5467}
5468
d88aee68
DG
5469/*
5470 * Add event to the UST channel registry. When the event is added to the
5471 * registry, the metadata is also created. Once done, this replies to the
5472 * application with the appropriate error code.
5473 *
5474 * The session UST registry lock is acquired in the function.
5475 *
5476 * On success 0 is returned else a negative value.
5477 */
d0b96690 5478static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name,
2106efa0
PP
5479 char *sig, size_t nr_fields, struct ustctl_field *fields,
5480 int loglevel_value, char *model_emf_uri)
d0b96690
DG
5481{
5482 int ret, ret_code;
5483 uint32_t event_id = 0;
7972aab2 5484 uint64_t chan_reg_key;
d0b96690
DG
5485 struct ust_app *app;
5486 struct ust_app_channel *ua_chan;
5487 struct ust_app_session *ua_sess;
7972aab2 5488 struct ust_registry_session *registry;
d0b96690
DG
5489
5490 rcu_read_lock();
5491
5492 /* Lookup application. If not found, there is a code flow error. */
5493 app = find_app_by_notify_sock(sock);
d88aee68 5494 if (!app) {
fad1ed2f 5495 DBG("Application socket %d is being torn down. Abort event notify",
d88aee68
DG
5496 sock);
5497 ret = 0;
5498 goto error_rcu_unlock;
5499 }
d0b96690 5500
4950b860 5501 /* Lookup channel by UST object descriptor. */
d0b96690 5502 ua_chan = find_channel_by_objd(app, cobjd);
4950b860 5503 if (!ua_chan) {
fad1ed2f 5504 DBG("Application channel is being torn down. Abort event notify");
4950b860
MD
5505 ret = 0;
5506 goto error_rcu_unlock;
5507 }
5508
d0b96690
DG
5509 assert(ua_chan->session);
5510 ua_sess = ua_chan->session;
5511
7972aab2 5512 registry = get_session_registry(ua_sess);
fad1ed2f
JR
5513 if (!registry) {
5514 DBG("Application session is being torn down. Abort event notify");
5515 ret = 0;
5516 goto error_rcu_unlock;
5517 }
7972aab2
DG
5518
5519 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) {
5520 chan_reg_key = ua_chan->tracing_channel_id;
5521 } else {
5522 chan_reg_key = ua_chan->key;
5523 }
5524
5525 pthread_mutex_lock(&registry->lock);
d0b96690 5526
d5d629b5
DG
5527 /*
5528 * From this point on, this call acquires the ownership of the sig, fields
5529 * and model_emf_uri meaning any free are done inside it if needed. These
5530 * three variables MUST NOT be read/write after this.
5531 */
7972aab2 5532 ret_code = ust_registry_create_event(registry, chan_reg_key,
2106efa0
PP
5533 sobjd, cobjd, name, sig, nr_fields, fields,
5534 loglevel_value, model_emf_uri, ua_sess->buffer_type,
5535 &event_id, app);
fad1ed2f
JR
5536 sig = NULL;
5537 fields = NULL;
5538 model_emf_uri = NULL;
d0b96690
DG
5539
5540 /*
5541 * The return value is returned to ustctl so in case of an error, the
5542 * application can be notified. In case of an error, it's important not to
5543 * return a negative error or else the application will get closed.
5544 */
5545 ret = ustctl_reply_register_event(sock, event_id, ret_code);
5546 if (ret < 0) {
5547 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
5548 ERR("UST app reply event failed with ret %d", ret);
5549 } else {
5550 DBG3("UST app reply event failed. Application died");
5551 }
5552 /*
5553 * No need to wipe the create event since the application socket will
5554 * get close on error hence cleaning up everything by itself.
5555 */
5556 goto error;
5557 }
5558
7972aab2
DG
5559 DBG3("UST registry event %s with id %" PRId32 " added successfully",
5560 name, event_id);
d88aee68 5561
d0b96690 5562error:
7972aab2 5563 pthread_mutex_unlock(&registry->lock);
d88aee68 5564error_rcu_unlock:
d0b96690 5565 rcu_read_unlock();
fad1ed2f
JR
5566 free(sig);
5567 free(fields);
5568 free(model_emf_uri);
d0b96690
DG
5569 return ret;
5570}
5571
10b56aef
MD
5572/*
5573 * Add enum to the UST session registry. Once done, this replies to the
5574 * application with the appropriate error code.
5575 *
5576 * The session UST registry lock is acquired within this function.
5577 *
5578 * On success 0 is returned else a negative value.
5579 */
5580static int add_enum_ust_registry(int sock, int sobjd, char *name,
5581 struct ustctl_enum_entry *entries, size_t nr_entries)
5582{
5583 int ret = 0, ret_code;
5584 struct ust_app *app;
5585 struct ust_app_session *ua_sess;
5586 struct ust_registry_session *registry;
5587 uint64_t enum_id = -1ULL;
5588
5589 rcu_read_lock();
5590
5591 /* Lookup application. If not found, there is a code flow error. */
5592 app = find_app_by_notify_sock(sock);
5593 if (!app) {
5594 /* Return an error since this is not an error */
5595 DBG("Application socket %d is being torn down. Aborting enum registration",
5596 sock);
5597 free(entries);
5598 goto error_rcu_unlock;
5599 }
5600
5601 /* Lookup session by UST object descriptor. */
5602 ua_sess = find_session_by_objd(app, sobjd);
5603 if (!ua_sess) {
5604 /* Return an error since this is not an error */
fad1ed2f 5605 DBG("Application session is being torn down (session not found). Aborting enum registration.");
10b56aef
MD
5606 free(entries);
5607 goto error_rcu_unlock;
5608 }
5609
5610 registry = get_session_registry(ua_sess);
fad1ed2f
JR
5611 if (!registry) {
5612 DBG("Application session is being torn down (registry not found). Aborting enum registration.");
5613 free(entries);
5614 goto error_rcu_unlock;
5615 }
10b56aef
MD
5616
5617 pthread_mutex_lock(&registry->lock);
5618
5619 /*
5620 * From this point on, the callee acquires the ownership of
5621 * entries. The variable entries MUST NOT be read/written after
5622 * call.
5623 */
5624 ret_code = ust_registry_create_or_find_enum(registry, sobjd, name,
5625 entries, nr_entries, &enum_id);
5626 entries = NULL;
5627
5628 /*
5629 * The return value is returned to ustctl so in case of an error, the
5630 * application can be notified. In case of an error, it's important not to
5631 * return a negative error or else the application will get closed.
5632 */
5633 ret = ustctl_reply_register_enum(sock, enum_id, ret_code);
5634 if (ret < 0) {
5635 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
5636 ERR("UST app reply enum failed with ret %d", ret);
5637 } else {
5638 DBG3("UST app reply enum failed. Application died");
5639 }
5640 /*
5641 * No need to wipe the create enum since the application socket will
5642 * get close on error hence cleaning up everything by itself.
5643 */
5644 goto error;
5645 }
5646
5647 DBG3("UST registry enum %s added successfully or already found", name);
5648
5649error:
5650 pthread_mutex_unlock(&registry->lock);
5651error_rcu_unlock:
5652 rcu_read_unlock();
5653 return ret;
5654}
5655
d88aee68
DG
5656/*
5657 * Handle application notification through the given notify socket.
5658 *
5659 * Return 0 on success or else a negative value.
5660 */
d0b96690
DG
5661int ust_app_recv_notify(int sock)
5662{
5663 int ret;
5664 enum ustctl_notify_cmd cmd;
5665
5666 DBG3("UST app receiving notify from sock %d", sock);
5667
5668 ret = ustctl_recv_notify(sock, &cmd);
5669 if (ret < 0) {
5670 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
5671 ERR("UST app recv notify failed with ret %d", ret);
5672 } else {
5673 DBG3("UST app recv notify failed. Application died");
5674 }
5675 goto error;
5676 }
5677
5678 switch (cmd) {
5679 case USTCTL_NOTIFY_CMD_EVENT:
5680 {
2106efa0 5681 int sobjd, cobjd, loglevel_value;
d0b96690
DG
5682 char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri;
5683 size_t nr_fields;
5684 struct ustctl_field *fields;
5685
5686 DBG2("UST app ustctl register event received");
5687
2106efa0
PP
5688 ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name,
5689 &loglevel_value, &sig, &nr_fields, &fields,
5690 &model_emf_uri);
d0b96690
DG
5691 if (ret < 0) {
5692 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
5693 ERR("UST app recv event failed with ret %d", ret);
5694 } else {
5695 DBG3("UST app recv event failed. Application died");
5696 }
5697 goto error;
5698 }
5699
d5d629b5
DG
5700 /*
5701 * Add event to the UST registry coming from the notify socket. This
5702 * call will free if needed the sig, fields and model_emf_uri. This
5703 * code path loses the ownsership of these variables and transfer them
5704 * to the this function.
5705 */
d0b96690 5706 ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields,
2106efa0 5707 fields, loglevel_value, model_emf_uri);
d0b96690
DG
5708 if (ret < 0) {
5709 goto error;
5710 }
5711
5712 break;
5713 }
5714 case USTCTL_NOTIFY_CMD_CHANNEL:
5715 {
5716 int sobjd, cobjd;
5717 size_t nr_fields;
5718 struct ustctl_field *fields;
5719
5720 DBG2("UST app ustctl register channel received");
5721
5722 ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields,
5723 &fields);
5724 if (ret < 0) {
5725 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
5726 ERR("UST app recv channel failed with ret %d", ret);
5727 } else {
5728 DBG3("UST app recv channel failed. Application died");
5729 }
5730 goto error;
5731 }
5732
d5d629b5
DG
5733 /*
5734 * The fields ownership are transfered to this function call meaning
5735 * that if needed it will be freed. After this, it's invalid to access
5736 * fields or clean it up.
5737 */
8eede835 5738 ret = reply_ust_register_channel(sock, cobjd, nr_fields,
d0b96690
DG
5739 fields);
5740 if (ret < 0) {
5741 goto error;
5742 }
5743
5744 break;
5745 }
10b56aef
MD
5746 case USTCTL_NOTIFY_CMD_ENUM:
5747 {
5748 int sobjd;
5749 char name[LTTNG_UST_SYM_NAME_LEN];
5750 size_t nr_entries;
5751 struct ustctl_enum_entry *entries;
5752
5753 DBG2("UST app ustctl register enum received");
5754
5755 ret = ustctl_recv_register_enum(sock, &sobjd, name,
5756 &entries, &nr_entries);
5757 if (ret < 0) {
5758 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
5759 ERR("UST app recv enum failed with ret %d", ret);
5760 } else {
5761 DBG3("UST app recv enum failed. Application died");
5762 }
5763 goto error;
5764 }
5765
5766 /* Callee assumes ownership of entries */
5767 ret = add_enum_ust_registry(sock, sobjd, name,
5768 entries, nr_entries);
5769 if (ret < 0) {
5770 goto error;
5771 }
5772
5773 break;
5774 }
d0b96690
DG
5775 default:
5776 /* Should NEVER happen. */
5777 assert(0);
5778 }
5779
5780error:
5781 return ret;
5782}
d88aee68
DG
5783
5784/*
5785 * Once the notify socket hangs up, this is called. First, it tries to find the
5786 * corresponding application. On failure, the call_rcu to close the socket is
5787 * executed. If an application is found, it tries to delete it from the notify
5788 * socket hash table. Whathever the result, it proceeds to the call_rcu.
5789 *
5790 * Note that an object needs to be allocated here so on ENOMEM failure, the
5791 * call RCU is not done but the rest of the cleanup is.
5792 */
5793void ust_app_notify_sock_unregister(int sock)
5794{
5795 int err_enomem = 0;
5796 struct lttng_ht_iter iter;
5797 struct ust_app *app;
5798 struct ust_app_notify_sock_obj *obj;
5799
5800 assert(sock >= 0);
5801
5802 rcu_read_lock();
5803
5804 obj = zmalloc(sizeof(*obj));
5805 if (!obj) {
5806 /*
5807 * An ENOMEM is kind of uncool. If this strikes we continue the
5808 * procedure but the call_rcu will not be called. In this case, we
5809 * accept the fd leak rather than possibly creating an unsynchronized
5810 * state between threads.
5811 *
5812 * TODO: The notify object should be created once the notify socket is
5813 * registered and stored independantely from the ust app object. The
5814 * tricky part is to synchronize the teardown of the application and
5815 * this notify object. Let's keep that in mind so we can avoid this
5816 * kind of shenanigans with ENOMEM in the teardown path.
5817 */
5818 err_enomem = 1;
5819 } else {
5820 obj->fd = sock;
5821 }
5822
5823 DBG("UST app notify socket unregister %d", sock);
5824
5825 /*
5826 * Lookup application by notify socket. If this fails, this means that the
5827 * hash table delete has already been done by the application
5828 * unregistration process so we can safely close the notify socket in a
5829 * call RCU.
5830 */
5831 app = find_app_by_notify_sock(sock);
5832 if (!app) {
5833 goto close_socket;
5834 }
5835
5836 iter.iter.node = &app->notify_sock_n.node;
5837
5838 /*
5839 * Whatever happens here either we fail or succeed, in both cases we have
5840 * to close the socket after a grace period to continue to the call RCU
5841 * here. If the deletion is successful, the application is not visible
5842 * anymore by other threads and is it fails it means that it was already
5843 * deleted from the hash table so either way we just have to close the
5844 * socket.
5845 */
5846 (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
5847
5848close_socket:
5849 rcu_read_unlock();
5850
5851 /*
5852 * Close socket after a grace period to avoid for the socket to be reused
5853 * before the application object is freed creating potential race between
5854 * threads trying to add unique in the global hash table.
5855 */
5856 if (!err_enomem) {
5857 call_rcu(&obj->head, close_notify_sock_rcu);
5858 }
5859}
f45e313d
DG
5860
5861/*
5862 * Destroy a ust app data structure and free its memory.
5863 */
5864void ust_app_destroy(struct ust_app *app)
5865{
5866 if (!app) {
5867 return;
5868 }
5869
5870 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
5871}
6dc3064a
DG
5872
5873/*
5874 * Take a snapshot for a given UST session. The snapshot is sent to the given
5875 * output.
5876 *
9a654598 5877 * Returns LTTNG_OK on success or a LTTNG_ERR error code.
6dc3064a 5878 */
fb9a95c4
JG
5879enum lttng_error_code ust_app_snapshot_record(
5880 const struct ltt_ust_session *usess,
348a81dc 5881 const struct consumer_output *output, int wait,
d07ceecd 5882 uint64_t nb_packets_per_stream)
6dc3064a
DG
5883{
5884 int ret = 0;
9a654598 5885 enum lttng_error_code status = LTTNG_OK;
6dc3064a
DG
5886 struct lttng_ht_iter iter;
5887 struct ust_app *app;
affce97e 5888 char *trace_path = NULL;
6dc3064a
DG
5889
5890 assert(usess);
5891 assert(output);
5892
5893 rcu_read_lock();
5894
8c924c7b
MD
5895 switch (usess->buffer_type) {
5896 case LTTNG_BUFFER_PER_UID:
5897 {
5898 struct buffer_reg_uid *reg;
6dc3064a 5899
8c924c7b
MD
5900 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
5901 struct buffer_reg_channel *reg_chan;
5902 struct consumer_socket *socket;
3b967712 5903 char pathname[PATH_MAX];
6dc3064a 5904
2b269489
JR
5905 if (!reg->registry->reg.ust->metadata_key) {
5906 /* Skip since no metadata is present */
5907 continue;
5908 }
5909
8c924c7b
MD
5910 /* Get consumer socket to use to push the metadata.*/
5911 socket = consumer_find_socket_by_bitness(reg->bits_per_long,
5912 usess->consumer);
5913 if (!socket) {
9a654598 5914 status = LTTNG_ERR_INVALID;
8c924c7b
MD
5915 goto error;
5916 }
6dc3064a 5917
8c924c7b 5918 memset(pathname, 0, sizeof(pathname));
d2956687
JG
5919 /*
5920 * DEFAULT_UST_TRACE_UID_PATH already contains a path
5921 * separator.
5922 */
8c924c7b 5923 ret = snprintf(pathname, sizeof(pathname),
d2956687 5924 DEFAULT_UST_TRACE_DIR DEFAULT_UST_TRACE_UID_PATH,
8c924c7b
MD
5925 reg->uid, reg->bits_per_long);
5926 if (ret < 0) {
5927 PERROR("snprintf snapshot path");
9a654598 5928 status = LTTNG_ERR_INVALID;
8c924c7b
MD
5929 goto error;
5930 }
affce97e
JG
5931 /* Free path allowed on previous iteration. */
5932 free(trace_path);
3b967712
MD
5933 trace_path = setup_channel_trace_path(usess->consumer, pathname);
5934 if (!trace_path) {
5935 status = LTTNG_ERR_INVALID;
5936 goto error;
5937 }
d2956687 5938 /* Add the UST default trace dir to path. */
8c924c7b
MD
5939 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
5940 reg_chan, node.node) {
9a654598 5941 status = consumer_snapshot_channel(socket,
e098433c
JG
5942 reg_chan->consumer_key,
5943 output, 0, usess->uid,
3b967712 5944 usess->gid, trace_path, wait,
d2956687 5945 nb_packets_per_stream);
9a654598 5946 if (status != LTTNG_OK) {
8c924c7b
MD
5947 goto error;
5948 }
5949 }
9a654598 5950 status = consumer_snapshot_channel(socket,
68808f4e 5951 reg->registry->reg.ust->metadata_key, output, 1,
3b967712 5952 usess->uid, usess->gid, trace_path, wait, 0);
9a654598 5953 if (status != LTTNG_OK) {
8c924c7b
MD
5954 goto error;
5955 }
af706bb7 5956 }
8c924c7b
MD
5957 break;
5958 }
5959 case LTTNG_BUFFER_PER_PID:
5960 {
5961 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
5962 struct consumer_socket *socket;
5963 struct lttng_ht_iter chan_iter;
5964 struct ust_app_channel *ua_chan;
5965 struct ust_app_session *ua_sess;
5966 struct ust_registry_session *registry;
3b967712 5967 char pathname[PATH_MAX];
8c924c7b
MD
5968
5969 ua_sess = lookup_session_by_app(usess, app);
5970 if (!ua_sess) {
5971 /* Session not associated with this app. */
5972 continue;
5973 }
af706bb7 5974
8c924c7b
MD
5975 /* Get the right consumer socket for the application. */
5976 socket = consumer_find_socket_by_bitness(app->bits_per_long,
348a81dc 5977 output);
8c924c7b 5978 if (!socket) {
9a654598 5979 status = LTTNG_ERR_INVALID;
5c786ded
JD
5980 goto error;
5981 }
5982
8c924c7b
MD
5983 /* Add the UST default trace dir to path. */
5984 memset(pathname, 0, sizeof(pathname));
d2956687 5985 ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "%s",
8c924c7b 5986 ua_sess->path);
6dc3064a 5987 if (ret < 0) {
9a654598 5988 status = LTTNG_ERR_INVALID;
8c924c7b 5989 PERROR("snprintf snapshot path");
6dc3064a
DG
5990 goto error;
5991 }
affce97e
JG
5992 /* Free path allowed on previous iteration. */
5993 free(trace_path);
3b967712
MD
5994 trace_path = setup_channel_trace_path(usess->consumer, pathname);
5995 if (!trace_path) {
5996 status = LTTNG_ERR_INVALID;
5997 goto error;
5998 }
d2956687 5999 cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
8c924c7b 6000 ua_chan, node.node) {
9a654598 6001 status = consumer_snapshot_channel(socket,
470cc211
JG
6002 ua_chan->key, output, 0,
6003 ua_sess->effective_credentials
6004 .uid,
6005 ua_sess->effective_credentials
6006 .gid,
3b967712 6007 trace_path, wait,
d2956687 6008 nb_packets_per_stream);
9a654598
JG
6009 switch (status) {
6010 case LTTNG_OK:
6011 break;
6012 case LTTNG_ERR_CHAN_NOT_FOUND:
6013 continue;
6014 default:
8c924c7b
MD
6015 goto error;
6016 }
6017 }
6018
6019 registry = get_session_registry(ua_sess);
fad1ed2f 6020 if (!registry) {
9bbfb88c
MD
6021 DBG("Application session is being torn down. Skip application.");
6022 continue;
fad1ed2f 6023 }
9a654598 6024 status = consumer_snapshot_channel(socket,
470cc211
JG
6025 registry->metadata_key, output, 1,
6026 ua_sess->effective_credentials.uid,
6027 ua_sess->effective_credentials.gid,
3b967712 6028 trace_path, wait, 0);
9a654598
JG
6029 switch (status) {
6030 case LTTNG_OK:
6031 break;
6032 case LTTNG_ERR_CHAN_NOT_FOUND:
6033 continue;
6034 default:
8c924c7b
MD
6035 goto error;
6036 }
6037 }
6038 break;
6039 }
6040 default:
6041 assert(0);
6042 break;
6dc3064a
DG
6043 }
6044
6045error:
affce97e 6046 free(trace_path);
6dc3064a 6047 rcu_read_unlock();
9a654598 6048 return status;
6dc3064a 6049}
5c786ded
JD
6050
6051/*
d07ceecd 6052 * Return the size taken by one more packet per stream.
5c786ded 6053 */
fb9a95c4
JG
6054uint64_t ust_app_get_size_one_more_packet_per_stream(
6055 const struct ltt_ust_session *usess, uint64_t cur_nr_packets)
5c786ded 6056{
d07ceecd 6057 uint64_t tot_size = 0;
5c786ded
JD
6058 struct ust_app *app;
6059 struct lttng_ht_iter iter;
6060
6061 assert(usess);
6062
6063 switch (usess->buffer_type) {
6064 case LTTNG_BUFFER_PER_UID:
6065 {
6066 struct buffer_reg_uid *reg;
6067
6068 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
6069 struct buffer_reg_channel *reg_chan;
6070
b7064eaa 6071 rcu_read_lock();
5c786ded
JD
6072 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
6073 reg_chan, node.node) {
d07ceecd
MD
6074 if (cur_nr_packets >= reg_chan->num_subbuf) {
6075 /*
6076 * Don't take channel into account if we
6077 * already grab all its packets.
6078 */
6079 continue;
6080 }
6081 tot_size += reg_chan->subbuf_size * reg_chan->stream_count;
5c786ded 6082 }
b7064eaa 6083 rcu_read_unlock();
5c786ded
JD
6084 }
6085 break;
6086 }
6087 case LTTNG_BUFFER_PER_PID:
6088 {
6089 rcu_read_lock();
6090 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
6091 struct ust_app_channel *ua_chan;
6092 struct ust_app_session *ua_sess;
6093 struct lttng_ht_iter chan_iter;
6094
6095 ua_sess = lookup_session_by_app(usess, app);
6096 if (!ua_sess) {
6097 /* Session not associated with this app. */
6098 continue;
6099 }
6100
6101 cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
6102 ua_chan, node.node) {
d07ceecd
MD
6103 if (cur_nr_packets >= ua_chan->attr.num_subbuf) {
6104 /*
6105 * Don't take channel into account if we
6106 * already grab all its packets.
6107 */
6108 continue;
6109 }
6110 tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count;
5c786ded
JD
6111 }
6112 }
6113 rcu_read_unlock();
6114 break;
6115 }
6116 default:
6117 assert(0);
6118 break;
6119 }
6120
d07ceecd 6121 return tot_size;
5c786ded 6122}
fb83fe64
JD
6123
6124int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id,
6125 struct cds_list_head *buffer_reg_uid_list,
6126 struct consumer_output *consumer, uint64_t uchan_id,
6127 int overwrite, uint64_t *discarded, uint64_t *lost)
6128{
6129 int ret;
6130 uint64_t consumer_chan_key;
6131
70dd8162
MD
6132 *discarded = 0;
6133 *lost = 0;
6134
fb83fe64 6135 ret = buffer_reg_uid_consumer_channel_key(
76604852 6136 buffer_reg_uid_list, uchan_id, &consumer_chan_key);
fb83fe64 6137 if (ret < 0) {
70dd8162
MD
6138 /* Not found */
6139 ret = 0;
fb83fe64
JD
6140 goto end;
6141 }
6142
6143 if (overwrite) {
6144 ret = consumer_get_lost_packets(ust_session_id,
6145 consumer_chan_key, consumer, lost);
6146 } else {
6147 ret = consumer_get_discarded_events(ust_session_id,
6148 consumer_chan_key, consumer, discarded);
6149 }
6150
6151end:
6152 return ret;
6153}
6154
6155int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess,
6156 struct ltt_ust_channel *uchan,
6157 struct consumer_output *consumer, int overwrite,
6158 uint64_t *discarded, uint64_t *lost)
6159{
6160 int ret = 0;
6161 struct lttng_ht_iter iter;
6162 struct lttng_ht_node_str *ua_chan_node;
6163 struct ust_app *app;
6164 struct ust_app_session *ua_sess;
6165 struct ust_app_channel *ua_chan;
6166
70dd8162
MD
6167 *discarded = 0;
6168 *lost = 0;
6169
fb83fe64
JD
6170 rcu_read_lock();
6171 /*
70dd8162
MD
6172 * Iterate over every registered applications. Sum counters for
6173 * all applications containing requested session and channel.
fb83fe64
JD
6174 */
6175 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
6176 struct lttng_ht_iter uiter;
6177
6178 ua_sess = lookup_session_by_app(usess, app);
6179 if (ua_sess == NULL) {
6180 continue;
6181 }
6182
6183 /* Get channel */
ee022399 6184 lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter);
fb83fe64
JD
6185 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
6186 /* If the session is found for the app, the channel must be there */
6187 assert(ua_chan_node);
6188
6189 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
6190
6191 if (overwrite) {
70dd8162
MD
6192 uint64_t _lost;
6193
fb83fe64 6194 ret = consumer_get_lost_packets(usess->id, ua_chan->key,
70dd8162
MD
6195 consumer, &_lost);
6196 if (ret < 0) {
6197 break;
6198 }
6199 (*lost) += _lost;
fb83fe64 6200 } else {
70dd8162
MD
6201 uint64_t _discarded;
6202
fb83fe64 6203 ret = consumer_get_discarded_events(usess->id,
70dd8162
MD
6204 ua_chan->key, consumer, &_discarded);
6205 if (ret < 0) {
6206 break;
6207 }
6208 (*discarded) += _discarded;
fb83fe64 6209 }
fb83fe64
JD
6210 }
6211
fb83fe64
JD
6212 rcu_read_unlock();
6213 return ret;
6214}
c2561365
JD
6215
6216static
6217int ust_app_regenerate_statedump(struct ltt_ust_session *usess,
6218 struct ust_app *app)
6219{
6220 int ret = 0;
6221 struct ust_app_session *ua_sess;
6222
6223 DBG("Regenerating the metadata for ust app pid %d", app->pid);
6224
6225 rcu_read_lock();
6226
6227 ua_sess = lookup_session_by_app(usess, app);
6228 if (ua_sess == NULL) {
6229 /* The session is in teardown process. Ignore and continue. */
6230 goto end;
6231 }
6232
6233 pthread_mutex_lock(&ua_sess->lock);
6234
6235 if (ua_sess->deleted) {
6236 goto end_unlock;
6237 }
6238
6239 pthread_mutex_lock(&app->sock_lock);
6240 ret = ustctl_regenerate_statedump(app->sock, ua_sess->handle);
6241 pthread_mutex_unlock(&app->sock_lock);
6242
6243end_unlock:
6244 pthread_mutex_unlock(&ua_sess->lock);
6245
6246end:
6247 rcu_read_unlock();
6248 health_code_update();
6249 return ret;
6250}
6251
6252/*
6253 * Regenerate the statedump for each app in the session.
6254 */
6255int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess)
6256{
6257 int ret = 0;
6258 struct lttng_ht_iter iter;
6259 struct ust_app *app;
6260
6261 DBG("Regenerating the metadata for all UST apps");
6262
6263 rcu_read_lock();
6264
6265 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
6266 if (!app->compatible) {
6267 continue;
6268 }
6269
6270 ret = ust_app_regenerate_statedump(usess, app);
6271 if (ret < 0) {
6272 /* Continue to the next app even on error */
6273 continue;
6274 }
6275 }
6276
6277 rcu_read_unlock();
6278
6279 return 0;
6280}
5c408ad8
JD
6281
6282/*
6283 * Rotate all the channels of a session.
6284 *
6f6d3b69 6285 * Return LTTNG_OK on success or else an LTTng error code.
5c408ad8 6286 */
6f6d3b69 6287enum lttng_error_code ust_app_rotate_session(struct ltt_session *session)
5c408ad8 6288{
6f6d3b69
MD
6289 int ret;
6290 enum lttng_error_code cmd_ret = LTTNG_OK;
5c408ad8
JD
6291 struct lttng_ht_iter iter;
6292 struct ust_app *app;
6293 struct ltt_ust_session *usess = session->ust_session;
5c408ad8
JD
6294
6295 assert(usess);
6296
6297 rcu_read_lock();
6298
6299 switch (usess->buffer_type) {
6300 case LTTNG_BUFFER_PER_UID:
6301 {
6302 struct buffer_reg_uid *reg;
6303
6304 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
6305 struct buffer_reg_channel *reg_chan;
6306 struct consumer_socket *socket;
6307
6308 /* Get consumer socket to use to push the metadata.*/
6309 socket = consumer_find_socket_by_bitness(reg->bits_per_long,
6310 usess->consumer);
6311 if (!socket) {
6f6d3b69 6312 cmd_ret = LTTNG_ERR_INVALID;
5c408ad8
JD
6313 goto error;
6314 }
6315
5c408ad8
JD
6316 /* Rotate the data channels. */
6317 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
6318 reg_chan, node.node) {
5c408ad8
JD
6319 ret = consumer_rotate_channel(socket,
6320 reg_chan->consumer_key,
6321 usess->uid, usess->gid,
d2956687
JG
6322 usess->consumer,
6323 /* is_metadata_channel */ false);
5c408ad8 6324 if (ret < 0) {
6f6d3b69 6325 cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER;
5c408ad8
JD
6326 goto error;
6327 }
6328 }
6329
6330 (void) push_metadata(reg->registry->reg.ust, usess->consumer);
6331
6332 ret = consumer_rotate_channel(socket,
6333 reg->registry->reg.ust->metadata_key,
6334 usess->uid, usess->gid,
d2956687
JG
6335 usess->consumer,
6336 /* is_metadata_channel */ true);
5c408ad8 6337 if (ret < 0) {
6f6d3b69 6338 cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER;
5c408ad8
JD
6339 goto error;
6340 }
5c408ad8
JD
6341 }
6342 break;
6343 }
6344 case LTTNG_BUFFER_PER_PID:
6345 {
6346 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
6347 struct consumer_socket *socket;
6348 struct lttng_ht_iter chan_iter;
6349 struct ust_app_channel *ua_chan;
6350 struct ust_app_session *ua_sess;
6351 struct ust_registry_session *registry;
6352
6353 ua_sess = lookup_session_by_app(usess, app);
6354 if (!ua_sess) {
6355 /* Session not associated with this app. */
6356 continue;
6357 }
5c408ad8
JD
6358
6359 /* Get the right consumer socket for the application. */
6360 socket = consumer_find_socket_by_bitness(app->bits_per_long,
6361 usess->consumer);
6362 if (!socket) {
6f6d3b69 6363 cmd_ret = LTTNG_ERR_INVALID;
5c408ad8
JD
6364 goto error;
6365 }
6366
6367 registry = get_session_registry(ua_sess);
6368 if (!registry) {
6f6d3b69
MD
6369 DBG("Application session is being torn down. Skip application.");
6370 continue;
5c408ad8
JD
6371 }
6372
5c408ad8
JD
6373 /* Rotate the data channels. */
6374 cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
6375 ua_chan, node.node) {
470cc211
JG
6376 ret = consumer_rotate_channel(socket,
6377 ua_chan->key,
6378 ua_sess->effective_credentials
6379 .uid,
6380 ua_sess->effective_credentials
6381 .gid,
d2956687
JG
6382 ua_sess->consumer,
6383 /* is_metadata_channel */ false);
5c408ad8 6384 if (ret < 0) {
6f6d3b69
MD
6385 /* Per-PID buffer and application going away. */
6386 if (ret == -LTTNG_ERR_CHAN_NOT_FOUND)
6387 continue;
6388 cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER;
5c408ad8
JD
6389 goto error;
6390 }
6391 }
6392
6393 /* Rotate the metadata channel. */
6394 (void) push_metadata(registry, usess->consumer);
470cc211
JG
6395 ret = consumer_rotate_channel(socket,
6396 registry->metadata_key,
6397 ua_sess->effective_credentials.uid,
6398 ua_sess->effective_credentials.gid,
d2956687
JG
6399 ua_sess->consumer,
6400 /* is_metadata_channel */ true);
5c408ad8 6401 if (ret < 0) {
6f6d3b69
MD
6402 /* Per-PID buffer and application going away. */
6403 if (ret == -LTTNG_ERR_CHAN_NOT_FOUND)
6404 continue;
6405 cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER;
5c408ad8
JD
6406 goto error;
6407 }
5c408ad8
JD
6408 }
6409 break;
6410 }
6411 default:
6412 assert(0);
6413 break;
6414 }
6415
6f6d3b69 6416 cmd_ret = LTTNG_OK;
5c408ad8
JD
6417
6418error:
6419 rcu_read_unlock();
6f6d3b69 6420 return cmd_ret;
5c408ad8 6421}
d2956687
JG
6422
6423enum lttng_error_code ust_app_create_channel_subdirectories(
6424 const struct ltt_ust_session *usess)
6425{
6426 enum lttng_error_code ret = LTTNG_OK;
6427 struct lttng_ht_iter iter;
6428 enum lttng_trace_chunk_status chunk_status;
6429 char *pathname_index;
6430 int fmt_ret;
6431
6432 assert(usess->current_trace_chunk);
6433 rcu_read_lock();
6434
6435 switch (usess->buffer_type) {
6436 case LTTNG_BUFFER_PER_UID:
6437 {
6438 struct buffer_reg_uid *reg;
6439
6440 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
6441 fmt_ret = asprintf(&pathname_index,
6442 DEFAULT_UST_TRACE_DIR DEFAULT_UST_TRACE_UID_PATH "/" DEFAULT_INDEX_DIR,
6443 reg->uid, reg->bits_per_long);
6444 if (fmt_ret < 0) {
6445 ERR("Failed to format channel index directory");
6446 ret = LTTNG_ERR_CREATE_DIR_FAIL;
6447 goto error;
6448 }
6449
6450 /*
6451 * Create the index subdirectory which will take care
6452 * of implicitly creating the channel's path.
6453 */
6454 chunk_status = lttng_trace_chunk_create_subdirectory(
6455 usess->current_trace_chunk,
6456 pathname_index);
6457 free(pathname_index);
6458 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
6459 ret = LTTNG_ERR_CREATE_DIR_FAIL;
6460 goto error;
6461 }
6462 }
6463 break;
6464 }
6465 case LTTNG_BUFFER_PER_PID:
6466 {
6467 struct ust_app *app;
6468
6469 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app,
6470 pid_n.node) {
6471 struct ust_app_session *ua_sess;
6472 struct ust_registry_session *registry;
6473
6474 ua_sess = lookup_session_by_app(usess, app);
6475 if (!ua_sess) {
6476 /* Session not associated with this app. */
6477 continue;
6478 }
6479
6480 registry = get_session_registry(ua_sess);
6481 if (!registry) {
6482 DBG("Application session is being torn down. Skip application.");
6483 continue;
6484 }
6485
6486 fmt_ret = asprintf(&pathname_index,
6487 DEFAULT_UST_TRACE_DIR "%s/" DEFAULT_INDEX_DIR,
6488 ua_sess->path);
6489 if (fmt_ret < 0) {
6490 ERR("Failed to format channel index directory");
6491 ret = LTTNG_ERR_CREATE_DIR_FAIL;
6492 goto error;
6493 }
6494 /*
6495 * Create the index subdirectory which will take care
6496 * of implicitly creating the channel's path.
6497 */
6498 chunk_status = lttng_trace_chunk_create_subdirectory(
6499 usess->current_trace_chunk,
6500 pathname_index);
6501 free(pathname_index);
6502 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
6503 ret = LTTNG_ERR_CREATE_DIR_FAIL;
6504 goto error;
6505 }
6506 }
6507 break;
6508 }
6509 default:
6510 abort();
6511 }
6512
6513 ret = LTTNG_OK;
6514error:
6515 rcu_read_unlock();
6516 return ret;
6517}
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