Move completed trace archive chunks to an "archives" sub-folder
[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
DG
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(
253 ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid);
254 if (!reg_uid) {
255 goto error;
256 }
257 registry = reg_uid->registry->reg.ust;
258 break;
259 }
260 default:
261 assert(0);
262 };
263
264error:
265 return registry;
266}
267
55cc08a6
DG
268/*
269 * Delete ust context safely. RCU read lock must be held before calling
270 * this function.
271 */
272static
fb45065e
MD
273void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx,
274 struct ust_app *app)
55cc08a6 275{
ffe60014
DG
276 int ret;
277
278 assert(ua_ctx);
279
55cc08a6 280 if (ua_ctx->obj) {
fb45065e 281 pthread_mutex_lock(&app->sock_lock);
ffe60014 282 ret = ustctl_release_object(sock, ua_ctx->obj);
fb45065e 283 pthread_mutex_unlock(&app->sock_lock);
d0b96690
DG
284 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
285 ERR("UST app sock %d release ctx obj handle %d failed with ret %d",
286 sock, ua_ctx->obj->handle, ret);
ffe60014 287 }
55cc08a6
DG
288 free(ua_ctx->obj);
289 }
290 free(ua_ctx);
291}
292
d80a6244
DG
293/*
294 * Delete ust app event safely. RCU read lock must be held before calling
295 * this function.
296 */
8b366481 297static
fb45065e
MD
298void delete_ust_app_event(int sock, struct ust_app_event *ua_event,
299 struct ust_app *app)
d80a6244 300{
ffe60014
DG
301 int ret;
302
303 assert(ua_event);
304
53a80697 305 free(ua_event->filter);
951f0b71
JI
306 if (ua_event->exclusion != NULL)
307 free(ua_event->exclusion);
edb67388 308 if (ua_event->obj != NULL) {
fb45065e 309 pthread_mutex_lock(&app->sock_lock);
ffe60014 310 ret = ustctl_release_object(sock, ua_event->obj);
fb45065e 311 pthread_mutex_unlock(&app->sock_lock);
ffe60014
DG
312 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
313 ERR("UST app sock %d release event obj failed with ret %d",
314 sock, ret);
315 }
edb67388
DG
316 free(ua_event->obj);
317 }
d80a6244
DG
318 free(ua_event);
319}
320
321/*
7972aab2
DG
322 * Release ust data object of the given stream.
323 *
324 * Return 0 on success or else a negative value.
d80a6244 325 */
fb45065e
MD
326static int release_ust_app_stream(int sock, struct ust_app_stream *stream,
327 struct ust_app *app)
d80a6244 328{
7972aab2 329 int ret = 0;
ffe60014
DG
330
331 assert(stream);
332
8b366481 333 if (stream->obj) {
fb45065e 334 pthread_mutex_lock(&app->sock_lock);
ffe60014 335 ret = ustctl_release_object(sock, stream->obj);
fb45065e 336 pthread_mutex_unlock(&app->sock_lock);
ffe60014
DG
337 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
338 ERR("UST app sock %d release stream obj failed with ret %d",
339 sock, ret);
340 }
4063050c 341 lttng_fd_put(LTTNG_FD_APPS, 2);
8b366481
DG
342 free(stream->obj);
343 }
7972aab2
DG
344
345 return ret;
346}
347
348/*
349 * Delete ust app stream safely. RCU read lock must be held before calling
350 * this function.
351 */
352static
fb45065e
MD
353void delete_ust_app_stream(int sock, struct ust_app_stream *stream,
354 struct ust_app *app)
7972aab2
DG
355{
356 assert(stream);
357
fb45065e 358 (void) release_ust_app_stream(sock, stream, app);
84cd17c6 359 free(stream);
d80a6244
DG
360}
361
36b588ed
MD
362/*
363 * We need to execute ht_destroy outside of RCU read-side critical
0b2dc8df
MD
364 * section and outside of call_rcu thread, so we postpone its execution
365 * using ht_cleanup_push. It is simpler than to change the semantic of
366 * the many callers of delete_ust_app_session().
36b588ed
MD
367 */
368static
369void delete_ust_app_channel_rcu(struct rcu_head *head)
370{
371 struct ust_app_channel *ua_chan =
372 caa_container_of(head, struct ust_app_channel, rcu_head);
373
0b2dc8df
MD
374 ht_cleanup_push(ua_chan->ctx);
375 ht_cleanup_push(ua_chan->events);
36b588ed
MD
376 free(ua_chan);
377}
378
fb83fe64
JD
379/*
380 * Extract the lost packet or discarded events counter when the channel is
381 * being deleted and store the value in the parent channel so we can
382 * access it from lttng list and at stop/destroy.
82cac6d2
JG
383 *
384 * The session list lock must be held by the caller.
fb83fe64
JD
385 */
386static
387void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan)
388{
389 uint64_t discarded = 0, lost = 0;
390 struct ltt_session *session;
391 struct ltt_ust_channel *uchan;
392
393 if (ua_chan->attr.type != LTTNG_UST_CHAN_PER_CPU) {
394 return;
395 }
396
397 rcu_read_lock();
398 session = session_find_by_id(ua_chan->session->tracing_id);
d68ec974
JG
399 if (!session || !session->ust_session) {
400 /*
401 * Not finding the session is not an error because there are
402 * multiple ways the channels can be torn down.
403 *
404 * 1) The session daemon can initiate the destruction of the
405 * ust app session after receiving a destroy command or
406 * during its shutdown/teardown.
407 * 2) The application, since we are in per-pid tracing, is
408 * unregistering and tearing down its ust app session.
409 *
410 * Both paths are protected by the session list lock which
411 * ensures that the accounting of lost packets and discarded
412 * events is done exactly once. The session is then unpublished
413 * from the session list, resulting in this condition.
414 */
fb83fe64
JD
415 goto end;
416 }
417
418 if (ua_chan->attr.overwrite) {
419 consumer_get_lost_packets(ua_chan->session->tracing_id,
420 ua_chan->key, session->ust_session->consumer,
421 &lost);
422 } else {
423 consumer_get_discarded_events(ua_chan->session->tracing_id,
424 ua_chan->key, session->ust_session->consumer,
425 &discarded);
426 }
427 uchan = trace_ust_find_channel_by_name(
428 session->ust_session->domain_global.channels,
429 ua_chan->name);
430 if (!uchan) {
431 ERR("Missing UST channel to store discarded counters");
432 goto end;
433 }
434
435 uchan->per_pid_closed_app_discarded += discarded;
436 uchan->per_pid_closed_app_lost += lost;
437
438end:
439 rcu_read_unlock();
e32d7f27
JG
440 if (session) {
441 session_put(session);
442 }
fb83fe64
JD
443}
444
d80a6244
DG
445/*
446 * Delete ust app channel safely. RCU read lock must be held before calling
447 * this function.
82cac6d2
JG
448 *
449 * The session list lock must be held by the caller.
d80a6244 450 */
8b366481 451static
d0b96690
DG
452void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan,
453 struct ust_app *app)
d80a6244
DG
454{
455 int ret;
bec39940 456 struct lttng_ht_iter iter;
d80a6244 457 struct ust_app_event *ua_event;
55cc08a6 458 struct ust_app_ctx *ua_ctx;
030a66fa 459 struct ust_app_stream *stream, *stmp;
7972aab2 460 struct ust_registry_session *registry;
d80a6244 461
ffe60014
DG
462 assert(ua_chan);
463
464 DBG3("UST app deleting channel %s", ua_chan->name);
465
55cc08a6 466 /* Wipe stream */
d80a6244 467 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
84cd17c6 468 cds_list_del(&stream->list);
fb45065e 469 delete_ust_app_stream(sock, stream, app);
d80a6244
DG
470 }
471
55cc08a6 472 /* Wipe context */
bec39940 473 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
31746f93 474 cds_list_del(&ua_ctx->list);
bec39940 475 ret = lttng_ht_del(ua_chan->ctx, &iter);
55cc08a6 476 assert(!ret);
fb45065e 477 delete_ust_app_ctx(sock, ua_ctx, app);
55cc08a6 478 }
d80a6244 479
55cc08a6 480 /* Wipe events */
bec39940
DG
481 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
482 node.node) {
483 ret = lttng_ht_del(ua_chan->events, &iter);
525b0740 484 assert(!ret);
fb45065e 485 delete_ust_app_event(sock, ua_event, app);
d80a6244 486 }
edb67388 487
c8335706
MD
488 if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) {
489 /* Wipe and free registry from session registry. */
490 registry = get_session_registry(ua_chan->session);
491 if (registry) {
e9404c27 492 ust_registry_channel_del_free(registry, ua_chan->key,
e38d96f9
MD
493 sock >= 0);
494 }
45798a31
JG
495 /*
496 * A negative socket can be used by the caller when
497 * cleaning-up a ua_chan in an error path. Skip the
498 * accounting in this case.
499 */
e38d96f9
MD
500 if (sock >= 0) {
501 save_per_pid_lost_discarded_counters(ua_chan);
c8335706 502 }
7972aab2 503 }
d0b96690 504
edb67388 505 if (ua_chan->obj != NULL) {
d0b96690
DG
506 /* Remove channel from application UST object descriptor. */
507 iter.iter.node = &ua_chan->ust_objd_node.node;
c6e62271
DG
508 ret = lttng_ht_del(app->ust_objd, &iter);
509 assert(!ret);
fb45065e 510 pthread_mutex_lock(&app->sock_lock);
ffe60014 511 ret = ustctl_release_object(sock, ua_chan->obj);
fb45065e 512 pthread_mutex_unlock(&app->sock_lock);
ffe60014
DG
513 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
514 ERR("UST app sock %d release channel obj failed with ret %d",
515 sock, ret);
516 }
7972aab2 517 lttng_fd_put(LTTNG_FD_APPS, 1);
edb67388
DG
518 free(ua_chan->obj);
519 }
36b588ed 520 call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu);
d80a6244
DG
521}
522
fb45065e
MD
523int ust_app_register_done(struct ust_app *app)
524{
525 int ret;
526
527 pthread_mutex_lock(&app->sock_lock);
528 ret = ustctl_register_done(app->sock);
529 pthread_mutex_unlock(&app->sock_lock);
530 return ret;
531}
532
533int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data)
534{
535 int ret, sock;
536
537 if (app) {
538 pthread_mutex_lock(&app->sock_lock);
539 sock = app->sock;
540 } else {
541 sock = -1;
542 }
543 ret = ustctl_release_object(sock, data);
544 if (app) {
545 pthread_mutex_unlock(&app->sock_lock);
546 }
547 return ret;
548}
549
331744e3 550/*
1b532a60
DG
551 * Push metadata to consumer socket.
552 *
dc2bbdae
MD
553 * RCU read-side lock must be held to guarantee existance of socket.
554 * Must be called with the ust app session lock held.
555 * Must be called with the registry lock held.
331744e3
JD
556 *
557 * On success, return the len of metadata pushed or else a negative value.
2c57e06d
MD
558 * Returning a -EPIPE return value means we could not send the metadata,
559 * but it can be caused by recoverable errors (e.g. the application has
560 * terminated concurrently).
331744e3
JD
561 */
562ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
563 struct consumer_socket *socket, int send_zero_data)
564{
565 int ret;
566 char *metadata_str = NULL;
c585821b 567 size_t len, offset, new_metadata_len_sent;
331744e3 568 ssize_t ret_val;
93ec662e 569 uint64_t metadata_key, metadata_version;
331744e3
JD
570
571 assert(registry);
572 assert(socket);
1b532a60 573
c585821b
MD
574 metadata_key = registry->metadata_key;
575
ce34fcd0 576 /*
dc2bbdae
MD
577 * Means that no metadata was assigned to the session. This can
578 * happens if no start has been done previously.
ce34fcd0 579 */
c585821b 580 if (!metadata_key) {
ce34fcd0
MD
581 return 0;
582 }
583
331744e3
JD
584 offset = registry->metadata_len_sent;
585 len = registry->metadata_len - registry->metadata_len_sent;
c585821b 586 new_metadata_len_sent = registry->metadata_len;
93ec662e 587 metadata_version = registry->metadata_version;
331744e3
JD
588 if (len == 0) {
589 DBG3("No metadata to push for metadata key %" PRIu64,
590 registry->metadata_key);
591 ret_val = len;
592 if (send_zero_data) {
593 DBG("No metadata to push");
594 goto push_data;
595 }
596 goto end;
597 }
598
599 /* Allocate only what we have to send. */
600 metadata_str = zmalloc(len);
601 if (!metadata_str) {
602 PERROR("zmalloc ust app metadata string");
603 ret_val = -ENOMEM;
604 goto error;
605 }
c585821b 606 /* Copy what we haven't sent out. */
331744e3 607 memcpy(metadata_str, registry->metadata + offset, len);
331744e3
JD
608
609push_data:
c585821b
MD
610 pthread_mutex_unlock(&registry->lock);
611 /*
612 * We need to unlock the registry while we push metadata to
613 * break a circular dependency between the consumerd metadata
614 * lock and the sessiond registry lock. Indeed, pushing metadata
615 * to the consumerd awaits that it gets pushed all the way to
616 * relayd, but doing so requires grabbing the metadata lock. If
617 * a concurrent metadata request is being performed by
618 * consumerd, this can try to grab the registry lock on the
619 * sessiond while holding the metadata lock on the consumer
620 * daemon. Those push and pull schemes are performed on two
621 * different bidirectionnal communication sockets.
622 */
623 ret = consumer_push_metadata(socket, metadata_key,
93ec662e 624 metadata_str, len, offset, metadata_version);
c585821b 625 pthread_mutex_lock(&registry->lock);
331744e3 626 if (ret < 0) {
000baf6a 627 /*
dc2bbdae
MD
628 * There is an acceptable race here between the registry
629 * metadata key assignment and the creation on the
630 * consumer. The session daemon can concurrently push
631 * metadata for this registry while being created on the
632 * consumer since the metadata key of the registry is
633 * assigned *before* it is setup to avoid the consumer
634 * to ask for metadata that could possibly be not found
635 * in the session daemon.
000baf6a 636 *
dc2bbdae
MD
637 * The metadata will get pushed either by the session
638 * being stopped or the consumer requesting metadata if
639 * that race is triggered.
000baf6a
DG
640 */
641 if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) {
642 ret = 0;
c585821b
MD
643 } else {
644 ERR("Error pushing metadata to consumer");
000baf6a 645 }
331744e3
JD
646 ret_val = ret;
647 goto error_push;
c585821b
MD
648 } else {
649 /*
650 * Metadata may have been concurrently pushed, since
651 * we're not holding the registry lock while pushing to
652 * consumer. This is handled by the fact that we send
653 * the metadata content, size, and the offset at which
654 * that metadata belongs. This may arrive out of order
655 * on the consumer side, and the consumer is able to
656 * deal with overlapping fragments. The consumer
657 * supports overlapping fragments, which must be
658 * contiguous starting from offset 0. We keep the
659 * largest metadata_len_sent value of the concurrent
660 * send.
661 */
662 registry->metadata_len_sent =
663 max_t(size_t, registry->metadata_len_sent,
664 new_metadata_len_sent);
331744e3 665 }
331744e3
JD
666 free(metadata_str);
667 return len;
668
669end:
670error:
ce34fcd0
MD
671 if (ret_val) {
672 /*
dc2bbdae
MD
673 * On error, flag the registry that the metadata is
674 * closed. We were unable to push anything and this
675 * means that either the consumer is not responding or
676 * the metadata cache has been destroyed on the
677 * consumer.
ce34fcd0
MD
678 */
679 registry->metadata_closed = 1;
680 }
331744e3
JD
681error_push:
682 free(metadata_str);
683 return ret_val;
684}
685
d88aee68 686/*
ce34fcd0 687 * For a given application and session, push metadata to consumer.
331744e3
JD
688 * Either sock or consumer is required : if sock is NULL, the default
689 * socket to send the metadata is retrieved from consumer, if sock
690 * is not NULL we use it to send the metadata.
ce34fcd0 691 * RCU read-side lock must be held while calling this function,
dc2bbdae
MD
692 * therefore ensuring existance of registry. It also ensures existance
693 * of socket throughout this function.
d88aee68
DG
694 *
695 * Return 0 on success else a negative error.
2c57e06d
MD
696 * Returning a -EPIPE return value means we could not send the metadata,
697 * but it can be caused by recoverable errors (e.g. the application has
698 * terminated concurrently).
d88aee68 699 */
7972aab2
DG
700static int push_metadata(struct ust_registry_session *registry,
701 struct consumer_output *consumer)
d88aee68 702{
331744e3
JD
703 int ret_val;
704 ssize_t ret;
d88aee68
DG
705 struct consumer_socket *socket;
706
7972aab2
DG
707 assert(registry);
708 assert(consumer);
709
ce34fcd0 710 pthread_mutex_lock(&registry->lock);
ce34fcd0 711 if (registry->metadata_closed) {
dc2bbdae
MD
712 ret_val = -EPIPE;
713 goto error;
d88aee68
DG
714 }
715
d88aee68 716 /* Get consumer socket to use to push the metadata.*/
7972aab2
DG
717 socket = consumer_find_socket_by_bitness(registry->bits_per_long,
718 consumer);
d88aee68 719 if (!socket) {
331744e3 720 ret_val = -1;
ce34fcd0 721 goto error;
d88aee68
DG
722 }
723
331744e3 724 ret = ust_app_push_metadata(registry, socket, 0);
d88aee68 725 if (ret < 0) {
331744e3 726 ret_val = ret;
ce34fcd0 727 goto error;
d88aee68 728 }
dc2bbdae 729 pthread_mutex_unlock(&registry->lock);
d88aee68
DG
730 return 0;
731
ce34fcd0 732error:
dc2bbdae 733 pthread_mutex_unlock(&registry->lock);
331744e3 734 return ret_val;
d88aee68
DG
735}
736
737/*
738 * Send to the consumer a close metadata command for the given session. Once
739 * done, the metadata channel is deleted and the session metadata pointer is
dc2bbdae 740 * nullified. The session lock MUST be held unless the application is
d88aee68
DG
741 * in the destroy path.
742 *
743 * Return 0 on success else a negative value.
744 */
7972aab2
DG
745static int close_metadata(struct ust_registry_session *registry,
746 struct consumer_output *consumer)
d88aee68
DG
747{
748 int ret;
749 struct consumer_socket *socket;
750
7972aab2
DG
751 assert(registry);
752 assert(consumer);
d88aee68 753
7972aab2
DG
754 rcu_read_lock();
755
ce34fcd0
MD
756 pthread_mutex_lock(&registry->lock);
757
7972aab2 758 if (!registry->metadata_key || registry->metadata_closed) {
d88aee68 759 ret = 0;
1b532a60 760 goto end;
d88aee68
DG
761 }
762
d88aee68 763 /* Get consumer socket to use to push the metadata.*/
7972aab2
DG
764 socket = consumer_find_socket_by_bitness(registry->bits_per_long,
765 consumer);
d88aee68
DG
766 if (!socket) {
767 ret = -1;
7972aab2 768 goto error;
d88aee68
DG
769 }
770
7972aab2 771 ret = consumer_close_metadata(socket, registry->metadata_key);
d88aee68 772 if (ret < 0) {
7972aab2 773 goto error;
d88aee68
DG
774 }
775
d88aee68 776error:
1b532a60
DG
777 /*
778 * Metadata closed. Even on error this means that the consumer is not
779 * responding or not found so either way a second close should NOT be emit
780 * for this registry.
781 */
782 registry->metadata_closed = 1;
783end:
ce34fcd0 784 pthread_mutex_unlock(&registry->lock);
7972aab2 785 rcu_read_unlock();
d88aee68
DG
786 return ret;
787}
788
36b588ed
MD
789/*
790 * We need to execute ht_destroy outside of RCU read-side critical
0b2dc8df
MD
791 * section and outside of call_rcu thread, so we postpone its execution
792 * using ht_cleanup_push. It is simpler than to change the semantic of
793 * the many callers of delete_ust_app_session().
36b588ed
MD
794 */
795static
796void delete_ust_app_session_rcu(struct rcu_head *head)
797{
798 struct ust_app_session *ua_sess =
799 caa_container_of(head, struct ust_app_session, rcu_head);
800
0b2dc8df 801 ht_cleanup_push(ua_sess->channels);
36b588ed
MD
802 free(ua_sess);
803}
804
d80a6244
DG
805/*
806 * Delete ust app session safely. RCU read lock must be held before calling
807 * this function.
82cac6d2
JG
808 *
809 * The session list lock must be held by the caller.
d80a6244 810 */
8b366481 811static
d0b96690
DG
812void delete_ust_app_session(int sock, struct ust_app_session *ua_sess,
813 struct ust_app *app)
d80a6244
DG
814{
815 int ret;
bec39940 816 struct lttng_ht_iter iter;
d80a6244 817 struct ust_app_channel *ua_chan;
7972aab2 818 struct ust_registry_session *registry;
d80a6244 819
d88aee68
DG
820 assert(ua_sess);
821
1b532a60
DG
822 pthread_mutex_lock(&ua_sess->lock);
823
b161602a
MD
824 assert(!ua_sess->deleted);
825 ua_sess->deleted = true;
826
7972aab2 827 registry = get_session_registry(ua_sess);
fad1ed2f 828 /* Registry can be null on error path during initialization. */
ce34fcd0 829 if (registry) {
d88aee68 830 /* Push metadata for application before freeing the application. */
7972aab2 831 (void) push_metadata(registry, ua_sess->consumer);
d88aee68 832
7972aab2
DG
833 /*
834 * Don't ask to close metadata for global per UID buffers. Close
1b532a60
DG
835 * metadata only on destroy trace session in this case. Also, the
836 * previous push metadata could have flag the metadata registry to
837 * close so don't send a close command if closed.
7972aab2 838 */
ce34fcd0 839 if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) {
7972aab2
DG
840 /* And ask to close it for this session registry. */
841 (void) close_metadata(registry, ua_sess->consumer);
842 }
d80a6244
DG
843 }
844
bec39940
DG
845 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
846 node.node) {
847 ret = lttng_ht_del(ua_sess->channels, &iter);
525b0740 848 assert(!ret);
d0b96690 849 delete_ust_app_channel(sock, ua_chan, app);
d80a6244 850 }
d80a6244 851
7972aab2
DG
852 /* In case of per PID, the registry is kept in the session. */
853 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) {
854 struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id);
855 if (reg_pid) {
fad1ed2f
JR
856 /*
857 * Registry can be null on error path during
858 * initialization.
859 */
7972aab2
DG
860 buffer_reg_pid_remove(reg_pid);
861 buffer_reg_pid_destroy(reg_pid);
862 }
863 }
d0b96690 864
aee6bafd 865 if (ua_sess->handle != -1) {
fb45065e 866 pthread_mutex_lock(&app->sock_lock);
ffe60014 867 ret = ustctl_release_handle(sock, ua_sess->handle);
fb45065e 868 pthread_mutex_unlock(&app->sock_lock);
ffe60014
DG
869 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
870 ERR("UST app sock %d release session handle failed with ret %d",
871 sock, ret);
872 }
10b56aef
MD
873 /* Remove session from application UST object descriptor. */
874 iter.iter.node = &ua_sess->ust_objd_node.node;
875 ret = lttng_ht_del(app->ust_sessions_objd, &iter);
876 assert(!ret);
aee6bafd 877 }
10b56aef 878
1b532a60
DG
879 pthread_mutex_unlock(&ua_sess->lock);
880
6addfa37
MD
881 consumer_output_put(ua_sess->consumer);
882
36b588ed 883 call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu);
d80a6244 884}
91d76f53
DG
885
886/*
284d8f55
DG
887 * Delete a traceable application structure from the global list. Never call
888 * this function outside of a call_rcu call.
36b588ed
MD
889 *
890 * RCU read side lock should _NOT_ be held when calling this function.
91d76f53 891 */
8b366481
DG
892static
893void delete_ust_app(struct ust_app *app)
91d76f53 894{
8b366481 895 int ret, sock;
d42f20df 896 struct ust_app_session *ua_sess, *tmp_ua_sess;
44d3bd01 897
82cac6d2
JG
898 /*
899 * The session list lock must be held during this function to guarantee
900 * the existence of ua_sess.
901 */
902 session_lock_list();
d80a6244 903 /* Delete ust app sessions info */
852d0037
DG
904 sock = app->sock;
905 app->sock = -1;
d80a6244 906
8b366481 907 /* Wipe sessions */
d42f20df
DG
908 cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head,
909 teardown_node) {
910 /* Free every object in the session and the session. */
36b588ed 911 rcu_read_lock();
d0b96690 912 delete_ust_app_session(sock, ua_sess, app);
36b588ed 913 rcu_read_unlock();
d80a6244 914 }
36b588ed 915
0b2dc8df 916 ht_cleanup_push(app->sessions);
10b56aef 917 ht_cleanup_push(app->ust_sessions_objd);
0b2dc8df 918 ht_cleanup_push(app->ust_objd);
d80a6244 919
6414a713 920 /*
852d0037
DG
921 * Wait until we have deleted the application from the sock hash table
922 * before closing this socket, otherwise an application could re-use the
923 * socket ID and race with the teardown, using the same hash table entry.
924 *
925 * It's OK to leave the close in call_rcu. We want it to stay unique for
926 * all RCU readers that could run concurrently with unregister app,
927 * therefore we _need_ to only close that socket after a grace period. So
928 * it should stay in this RCU callback.
929 *
930 * This close() is a very important step of the synchronization model so
931 * every modification to this function must be carefully reviewed.
6414a713 932 */
799e2c4f
MD
933 ret = close(sock);
934 if (ret) {
935 PERROR("close");
936 }
4063050c 937 lttng_fd_put(LTTNG_FD_APPS, 1);
d80a6244 938
852d0037 939 DBG2("UST app pid %d deleted", app->pid);
284d8f55 940 free(app);
82cac6d2 941 session_unlock_list();
099e26bd
DG
942}
943
944/*
f6a9efaa 945 * URCU intermediate call to delete an UST app.
099e26bd 946 */
8b366481
DG
947static
948void delete_ust_app_rcu(struct rcu_head *head)
099e26bd 949{
bec39940
DG
950 struct lttng_ht_node_ulong *node =
951 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa 952 struct ust_app *app =
852d0037 953 caa_container_of(node, struct ust_app, pid_n);
f6a9efaa 954
852d0037 955 DBG3("Call RCU deleting app PID %d", app->pid);
f6a9efaa 956 delete_ust_app(app);
099e26bd
DG
957}
958
ffe60014
DG
959/*
960 * Delete the session from the application ht and delete the data structure by
961 * freeing every object inside and releasing them.
82cac6d2
JG
962 *
963 * The session list lock must be held by the caller.
ffe60014 964 */
d0b96690 965static void destroy_app_session(struct ust_app *app,
ffe60014
DG
966 struct ust_app_session *ua_sess)
967{
968 int ret;
969 struct lttng_ht_iter iter;
970
971 assert(app);
972 assert(ua_sess);
973
974 iter.iter.node = &ua_sess->node.node;
975 ret = lttng_ht_del(app->sessions, &iter);
976 if (ret) {
977 /* Already scheduled for teardown. */
978 goto end;
979 }
980
981 /* Once deleted, free the data structure. */
d0b96690 982 delete_ust_app_session(app->sock, ua_sess, app);
ffe60014
DG
983
984end:
985 return;
986}
987
8b366481
DG
988/*
989 * Alloc new UST app session.
990 */
991static
40bbd087 992struct ust_app_session *alloc_ust_app_session(void)
8b366481
DG
993{
994 struct ust_app_session *ua_sess;
995
996 /* Init most of the default value by allocating and zeroing */
997 ua_sess = zmalloc(sizeof(struct ust_app_session));
998 if (ua_sess == NULL) {
999 PERROR("malloc");
ffe60014 1000 goto error_free;
8b366481
DG
1001 }
1002
1003 ua_sess->handle = -1;
bec39940 1004 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
ad7a9107 1005 ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA;
84ad93e8 1006 pthread_mutex_init(&ua_sess->lock, NULL);
ad7a9107 1007
8b366481
DG
1008 return ua_sess;
1009
ffe60014 1010error_free:
8b366481
DG
1011 return NULL;
1012}
1013
1014/*
1015 * Alloc new UST app channel.
1016 */
1017static
1018struct ust_app_channel *alloc_ust_app_channel(char *name,
d0b96690 1019 struct ust_app_session *ua_sess,
ffe60014 1020 struct lttng_ust_channel_attr *attr)
8b366481
DG
1021{
1022 struct ust_app_channel *ua_chan;
1023
1024 /* Init most of the default value by allocating and zeroing */
1025 ua_chan = zmalloc(sizeof(struct ust_app_channel));
1026 if (ua_chan == NULL) {
1027 PERROR("malloc");
1028 goto error;
1029 }
1030
1031 /* Setup channel name */
1032 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
1033 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
1034
1035 ua_chan->enabled = 1;
1036 ua_chan->handle = -1;
45893984 1037 ua_chan->session = ua_sess;
ffe60014 1038 ua_chan->key = get_next_channel_key();
bec39940
DG
1039 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1040 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
1041 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
8b366481
DG
1042
1043 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
31746f93 1044 CDS_INIT_LIST_HEAD(&ua_chan->ctx_list);
8b366481
DG
1045
1046 /* Copy attributes */
1047 if (attr) {
ffe60014 1048 /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */
2fe6e7f5
DG
1049 ua_chan->attr.subbuf_size = attr->subbuf_size;
1050 ua_chan->attr.num_subbuf = attr->num_subbuf;
1051 ua_chan->attr.overwrite = attr->overwrite;
1052 ua_chan->attr.switch_timer_interval = attr->switch_timer_interval;
1053 ua_chan->attr.read_timer_interval = attr->read_timer_interval;
1054 ua_chan->attr.output = attr->output;
491d1539 1055 ua_chan->attr.blocking_timeout = attr->u.s.blocking_timeout;
8b366481 1056 }
ffe60014
DG
1057 /* By default, the channel is a per cpu channel. */
1058 ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU;
8b366481
DG
1059
1060 DBG3("UST app channel %s allocated", ua_chan->name);
1061
1062 return ua_chan;
1063
1064error:
1065 return NULL;
1066}
1067
37f1c236
DG
1068/*
1069 * Allocate and initialize a UST app stream.
1070 *
1071 * Return newly allocated stream pointer or NULL on error.
1072 */
ffe60014 1073struct ust_app_stream *ust_app_alloc_stream(void)
37f1c236
DG
1074{
1075 struct ust_app_stream *stream = NULL;
1076
1077 stream = zmalloc(sizeof(*stream));
1078 if (stream == NULL) {
1079 PERROR("zmalloc ust app stream");
1080 goto error;
1081 }
1082
1083 /* Zero could be a valid value for a handle so flag it to -1. */
1084 stream->handle = -1;
1085
1086error:
1087 return stream;
1088}
1089
8b366481
DG
1090/*
1091 * Alloc new UST app event.
1092 */
1093static
1094struct ust_app_event *alloc_ust_app_event(char *name,
1095 struct lttng_ust_event *attr)
1096{
1097 struct ust_app_event *ua_event;
1098
1099 /* Init most of the default value by allocating and zeroing */
1100 ua_event = zmalloc(sizeof(struct ust_app_event));
1101 if (ua_event == NULL) {
1102 PERROR("malloc");
1103 goto error;
1104 }
1105
1106 ua_event->enabled = 1;
1107 strncpy(ua_event->name, name, sizeof(ua_event->name));
1108 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
bec39940 1109 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
8b366481
DG
1110
1111 /* Copy attributes */
1112 if (attr) {
1113 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
1114 }
1115
1116 DBG3("UST app event %s allocated", ua_event->name);
1117
1118 return ua_event;
1119
1120error:
1121 return NULL;
1122}
1123
1124/*
1125 * Alloc new UST app context.
1126 */
1127static
bdf64013 1128struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx)
8b366481
DG
1129{
1130 struct ust_app_ctx *ua_ctx;
1131
1132 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
1133 if (ua_ctx == NULL) {
1134 goto error;
1135 }
1136
31746f93
DG
1137 CDS_INIT_LIST_HEAD(&ua_ctx->list);
1138
8b366481
DG
1139 if (uctx) {
1140 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
bdf64013
JG
1141 if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) {
1142 char *provider_name = NULL, *ctx_name = NULL;
1143
1144 provider_name = strdup(uctx->u.app_ctx.provider_name);
1145 ctx_name = strdup(uctx->u.app_ctx.ctx_name);
1146 if (!provider_name || !ctx_name) {
1147 free(provider_name);
1148 free(ctx_name);
1149 goto error;
1150 }
1151
1152 ua_ctx->ctx.u.app_ctx.provider_name = provider_name;
1153 ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name;
1154 }
8b366481
DG
1155 }
1156
1157 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
8b366481 1158 return ua_ctx;
bdf64013
JG
1159error:
1160 free(ua_ctx);
1161 return NULL;
8b366481
DG
1162}
1163
025faf73
DG
1164/*
1165 * Allocate a filter and copy the given original filter.
1166 *
1167 * Return allocated filter or NULL on error.
1168 */
51755dc8
JG
1169static struct lttng_filter_bytecode *copy_filter_bytecode(
1170 struct lttng_filter_bytecode *orig_f)
025faf73 1171{
51755dc8 1172 struct lttng_filter_bytecode *filter = NULL;
025faf73
DG
1173
1174 /* Copy filter bytecode */
1175 filter = zmalloc(sizeof(*filter) + orig_f->len);
1176 if (!filter) {
51755dc8 1177 PERROR("zmalloc alloc filter bytecode");
025faf73
DG
1178 goto error;
1179 }
1180
1181 memcpy(filter, orig_f, sizeof(*filter) + orig_f->len);
1182
1183error:
1184 return filter;
1185}
1186
51755dc8
JG
1187/*
1188 * Create a liblttng-ust filter bytecode from given bytecode.
1189 *
1190 * Return allocated filter or NULL on error.
1191 */
1192static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode(
1193 struct lttng_filter_bytecode *orig_f)
1194{
1195 struct lttng_ust_filter_bytecode *filter = NULL;
1196
1197 /* Copy filter bytecode */
1198 filter = zmalloc(sizeof(*filter) + orig_f->len);
1199 if (!filter) {
1200 PERROR("zmalloc alloc ust filter bytecode");
1201 goto error;
1202 }
1203
1204 assert(sizeof(struct lttng_filter_bytecode) ==
1205 sizeof(struct lttng_ust_filter_bytecode));
1206 memcpy(filter, orig_f, sizeof(*filter) + orig_f->len);
1207error:
1208 return filter;
1209}
1210
099e26bd 1211/*
421cb601
DG
1212 * Find an ust_app using the sock and return it. RCU read side lock must be
1213 * held before calling this helper function.
099e26bd 1214 */
f20baf8e 1215struct ust_app *ust_app_find_by_sock(int sock)
099e26bd 1216{
bec39940 1217 struct lttng_ht_node_ulong *node;
bec39940 1218 struct lttng_ht_iter iter;
f6a9efaa 1219
852d0037 1220 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 1221 node = lttng_ht_iter_get_node_ulong(&iter);
f6a9efaa
DG
1222 if (node == NULL) {
1223 DBG2("UST app find by sock %d not found", sock);
f6a9efaa
DG
1224 goto error;
1225 }
852d0037
DG
1226
1227 return caa_container_of(node, struct ust_app, sock_n);
f6a9efaa
DG
1228
1229error:
1230 return NULL;
099e26bd
DG
1231}
1232
d0b96690
DG
1233/*
1234 * Find an ust_app using the notify sock and return it. RCU read side lock must
1235 * be held before calling this helper function.
1236 */
1237static struct ust_app *find_app_by_notify_sock(int sock)
1238{
1239 struct lttng_ht_node_ulong *node;
1240 struct lttng_ht_iter iter;
1241
1242 lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock),
1243 &iter);
1244 node = lttng_ht_iter_get_node_ulong(&iter);
1245 if (node == NULL) {
1246 DBG2("UST app find by notify sock %d not found", sock);
1247 goto error;
1248 }
1249
1250 return caa_container_of(node, struct ust_app, notify_sock_n);
1251
1252error:
1253 return NULL;
1254}
1255
025faf73
DG
1256/*
1257 * Lookup for an ust app event based on event name, filter bytecode and the
1258 * event loglevel.
1259 *
1260 * Return an ust_app_event object or NULL on error.
1261 */
18eace3b 1262static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht,
88e3c2f5 1263 const char *name, const struct lttng_filter_bytecode *filter,
2106efa0 1264 int loglevel_value,
39c5a3a7 1265 const struct lttng_event_exclusion *exclusion)
18eace3b
DG
1266{
1267 struct lttng_ht_iter iter;
1268 struct lttng_ht_node_str *node;
1269 struct ust_app_event *event = NULL;
1270 struct ust_app_ht_key key;
18eace3b
DG
1271
1272 assert(name);
1273 assert(ht);
1274
1275 /* Setup key for event lookup. */
1276 key.name = name;
1277 key.filter = filter;
2106efa0 1278 key.loglevel_type = loglevel_value;
39c5a3a7 1279 /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */
51755dc8 1280 key.exclusion = exclusion;
18eace3b 1281
025faf73
DG
1282 /* Lookup using the event name as hash and a custom match fct. */
1283 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
1284 ht_match_ust_app_event, &key, &iter.iter);
18eace3b
DG
1285 node = lttng_ht_iter_get_node_str(&iter);
1286 if (node == NULL) {
1287 goto end;
1288 }
1289
1290 event = caa_container_of(node, struct ust_app_event, node);
1291
1292end:
18eace3b
DG
1293 return event;
1294}
1295
55cc08a6
DG
1296/*
1297 * Create the channel context on the tracer.
d0b96690
DG
1298 *
1299 * Called with UST app session lock held.
55cc08a6
DG
1300 */
1301static
1302int create_ust_channel_context(struct ust_app_channel *ua_chan,
1303 struct ust_app_ctx *ua_ctx, struct ust_app *app)
1304{
1305 int ret;
1306
840cb59c 1307 health_code_update();
86acf0da 1308
fb45065e 1309 pthread_mutex_lock(&app->sock_lock);
852d0037 1310 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
55cc08a6 1311 ua_chan->obj, &ua_ctx->obj);
fb45065e 1312 pthread_mutex_unlock(&app->sock_lock);
55cc08a6 1313 if (ret < 0) {
ffe60014
DG
1314 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1315 ERR("UST app create channel context failed for app (pid: %d) "
1316 "with ret %d", app->pid, ret);
1317 } else {
3757b385
DG
1318 /*
1319 * This is normal behavior, an application can die during the
1320 * creation process. Don't report an error so the execution can
1321 * continue normally.
1322 */
1323 ret = 0;
88e3c2f5 1324 DBG3("UST app add context failed. Application is dead.");
ffe60014 1325 }
55cc08a6
DG
1326 goto error;
1327 }
1328
1329 ua_ctx->handle = ua_ctx->obj->handle;
1330
d0b96690
DG
1331 DBG2("UST app context handle %d created successfully for channel %s",
1332 ua_ctx->handle, ua_chan->name);
55cc08a6
DG
1333
1334error:
840cb59c 1335 health_code_update();
55cc08a6
DG
1336 return ret;
1337}
1338
53a80697
MD
1339/*
1340 * Set the filter on the tracer.
1341 */
1342static
1343int set_ust_event_filter(struct ust_app_event *ua_event,
1344 struct ust_app *app)
1345{
1346 int ret;
51755dc8 1347 struct lttng_ust_filter_bytecode *ust_bytecode = NULL;
53a80697 1348
840cb59c 1349 health_code_update();
86acf0da 1350
53a80697 1351 if (!ua_event->filter) {
86acf0da
DG
1352 ret = 0;
1353 goto error;
53a80697
MD
1354 }
1355
51755dc8
JG
1356 ust_bytecode = create_ust_bytecode_from_bytecode(ua_event->filter);
1357 if (!ust_bytecode) {
1358 ret = -LTTNG_ERR_NOMEM;
1359 goto error;
1360 }
fb45065e 1361 pthread_mutex_lock(&app->sock_lock);
51755dc8 1362 ret = ustctl_set_filter(app->sock, ust_bytecode,
53a80697 1363 ua_event->obj);
fb45065e 1364 pthread_mutex_unlock(&app->sock_lock);
53a80697 1365 if (ret < 0) {
ffe60014
DG
1366 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1367 ERR("UST app event %s filter failed for app (pid: %d) "
1368 "with ret %d", ua_event->attr.name, app->pid, ret);
1369 } else {
3757b385
DG
1370 /*
1371 * This is normal behavior, an application can die during the
1372 * creation process. Don't report an error so the execution can
1373 * continue normally.
1374 */
1375 ret = 0;
ffe60014
DG
1376 DBG3("UST app filter event failed. Application is dead.");
1377 }
53a80697
MD
1378 goto error;
1379 }
1380
1381 DBG2("UST filter set successfully for event %s", ua_event->name);
1382
1383error:
840cb59c 1384 health_code_update();
51755dc8 1385 free(ust_bytecode);
53a80697
MD
1386 return ret;
1387}
1388
51755dc8
JG
1389static
1390struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion(
1391 struct lttng_event_exclusion *exclusion)
1392{
1393 struct lttng_ust_event_exclusion *ust_exclusion = NULL;
1394 size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) +
1395 LTTNG_UST_SYM_NAME_LEN * exclusion->count;
1396
1397 ust_exclusion = zmalloc(exclusion_alloc_size);
1398 if (!ust_exclusion) {
1399 PERROR("malloc");
1400 goto end;
1401 }
1402
1403 assert(sizeof(struct lttng_event_exclusion) ==
1404 sizeof(struct lttng_ust_event_exclusion));
1405 memcpy(ust_exclusion, exclusion, exclusion_alloc_size);
1406end:
1407 return ust_exclusion;
1408}
1409
7cc9a73c
JI
1410/*
1411 * Set event exclusions on the tracer.
1412 */
1413static
1414int set_ust_event_exclusion(struct ust_app_event *ua_event,
1415 struct ust_app *app)
1416{
1417 int ret;
51755dc8 1418 struct lttng_ust_event_exclusion *ust_exclusion = NULL;
7cc9a73c
JI
1419
1420 health_code_update();
1421
1422 if (!ua_event->exclusion || !ua_event->exclusion->count) {
1423 ret = 0;
1424 goto error;
1425 }
1426
51755dc8
JG
1427 ust_exclusion = create_ust_exclusion_from_exclusion(
1428 ua_event->exclusion);
1429 if (!ust_exclusion) {
1430 ret = -LTTNG_ERR_NOMEM;
1431 goto error;
1432 }
fb45065e 1433 pthread_mutex_lock(&app->sock_lock);
51755dc8 1434 ret = ustctl_set_exclusion(app->sock, ust_exclusion, ua_event->obj);
fb45065e 1435 pthread_mutex_unlock(&app->sock_lock);
7cc9a73c
JI
1436 if (ret < 0) {
1437 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1438 ERR("UST app event %s exclusions failed for app (pid: %d) "
1439 "with ret %d", ua_event->attr.name, app->pid, ret);
1440 } else {
1441 /*
1442 * This is normal behavior, an application can die during the
1443 * creation process. Don't report an error so the execution can
1444 * continue normally.
1445 */
1446 ret = 0;
1447 DBG3("UST app event exclusion failed. Application is dead.");
1448 }
1449 goto error;
1450 }
1451
1452 DBG2("UST exclusion set successfully for event %s", ua_event->name);
1453
1454error:
1455 health_code_update();
51755dc8 1456 free(ust_exclusion);
7cc9a73c
JI
1457 return ret;
1458}
1459
9730260e
DG
1460/*
1461 * Disable the specified event on to UST tracer for the UST session.
1462 */
1463static int disable_ust_event(struct ust_app *app,
1464 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
1465{
1466 int ret;
1467
840cb59c 1468 health_code_update();
86acf0da 1469
fb45065e 1470 pthread_mutex_lock(&app->sock_lock);
852d0037 1471 ret = ustctl_disable(app->sock, ua_event->obj);
fb45065e 1472 pthread_mutex_unlock(&app->sock_lock);
9730260e 1473 if (ret < 0) {
ffe60014
DG
1474 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1475 ERR("UST app event %s disable failed for app (pid: %d) "
1476 "and session handle %d with ret %d",
1477 ua_event->attr.name, app->pid, ua_sess->handle, ret);
1478 } else {
3757b385
DG
1479 /*
1480 * This is normal behavior, an application can die during the
1481 * creation process. Don't report an error so the execution can
1482 * continue normally.
1483 */
1484 ret = 0;
ffe60014
DG
1485 DBG3("UST app disable event failed. Application is dead.");
1486 }
9730260e
DG
1487 goto error;
1488 }
1489
1490 DBG2("UST app event %s disabled successfully for app (pid: %d)",
852d0037 1491 ua_event->attr.name, app->pid);
9730260e
DG
1492
1493error:
840cb59c 1494 health_code_update();
9730260e
DG
1495 return ret;
1496}
1497
78f0bacd
DG
1498/*
1499 * Disable the specified channel on to UST tracer for the UST session.
1500 */
1501static int disable_ust_channel(struct ust_app *app,
1502 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
1503{
1504 int ret;
1505
840cb59c 1506 health_code_update();
86acf0da 1507
fb45065e 1508 pthread_mutex_lock(&app->sock_lock);
852d0037 1509 ret = ustctl_disable(app->sock, ua_chan->obj);
fb45065e 1510 pthread_mutex_unlock(&app->sock_lock);
78f0bacd 1511 if (ret < 0) {
ffe60014
DG
1512 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1513 ERR("UST app channel %s disable failed for app (pid: %d) "
1514 "and session handle %d with ret %d",
1515 ua_chan->name, app->pid, ua_sess->handle, ret);
1516 } else {
3757b385
DG
1517 /*
1518 * This is normal behavior, an application can die during the
1519 * creation process. Don't report an error so the execution can
1520 * continue normally.
1521 */
1522 ret = 0;
ffe60014
DG
1523 DBG3("UST app disable channel failed. Application is dead.");
1524 }
78f0bacd
DG
1525 goto error;
1526 }
1527
78f0bacd 1528 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
852d0037 1529 ua_chan->name, app->pid);
78f0bacd
DG
1530
1531error:
840cb59c 1532 health_code_update();
78f0bacd
DG
1533 return ret;
1534}
1535
1536/*
1537 * Enable the specified channel on to UST tracer for the UST session.
1538 */
1539static int enable_ust_channel(struct ust_app *app,
1540 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
1541{
1542 int ret;
1543
840cb59c 1544 health_code_update();
86acf0da 1545
fb45065e 1546 pthread_mutex_lock(&app->sock_lock);
852d0037 1547 ret = ustctl_enable(app->sock, ua_chan->obj);
fb45065e 1548 pthread_mutex_unlock(&app->sock_lock);
78f0bacd 1549 if (ret < 0) {
ffe60014
DG
1550 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1551 ERR("UST app channel %s enable failed for app (pid: %d) "
1552 "and session handle %d with ret %d",
1553 ua_chan->name, app->pid, ua_sess->handle, ret);
1554 } else {
3757b385
DG
1555 /*
1556 * This is normal behavior, an application can die during the
1557 * creation process. Don't report an error so the execution can
1558 * continue normally.
1559 */
1560 ret = 0;
ffe60014
DG
1561 DBG3("UST app enable channel failed. Application is dead.");
1562 }
78f0bacd
DG
1563 goto error;
1564 }
1565
1566 ua_chan->enabled = 1;
1567
1568 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
852d0037 1569 ua_chan->name, app->pid);
78f0bacd
DG
1570
1571error:
840cb59c 1572 health_code_update();
78f0bacd
DG
1573 return ret;
1574}
1575
edb67388
DG
1576/*
1577 * Enable the specified event on to UST tracer for the UST session.
1578 */
1579static int enable_ust_event(struct ust_app *app,
1580 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
1581{
1582 int ret;
1583
840cb59c 1584 health_code_update();
86acf0da 1585
fb45065e 1586 pthread_mutex_lock(&app->sock_lock);
852d0037 1587 ret = ustctl_enable(app->sock, ua_event->obj);
fb45065e 1588 pthread_mutex_unlock(&app->sock_lock);
edb67388 1589 if (ret < 0) {
ffe60014
DG
1590 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1591 ERR("UST app event %s enable failed for app (pid: %d) "
1592 "and session handle %d with ret %d",
1593 ua_event->attr.name, app->pid, ua_sess->handle, ret);
1594 } else {
3757b385
DG
1595 /*
1596 * This is normal behavior, an application can die during the
1597 * creation process. Don't report an error so the execution can
1598 * continue normally.
1599 */
1600 ret = 0;
ffe60014
DG
1601 DBG3("UST app enable event failed. Application is dead.");
1602 }
edb67388
DG
1603 goto error;
1604 }
1605
1606 DBG2("UST app event %s enabled successfully for app (pid: %d)",
852d0037 1607 ua_event->attr.name, app->pid);
edb67388
DG
1608
1609error:
840cb59c 1610 health_code_update();
edb67388
DG
1611 return ret;
1612}
1613
099e26bd 1614/*
7972aab2 1615 * Send channel and stream buffer to application.
4f3ab6ee 1616 *
ffe60014 1617 * Return 0 on success. On error, a negative value is returned.
4f3ab6ee 1618 */
7972aab2
DG
1619static int send_channel_pid_to_ust(struct ust_app *app,
1620 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
4f3ab6ee
DG
1621{
1622 int ret;
ffe60014 1623 struct ust_app_stream *stream, *stmp;
4f3ab6ee
DG
1624
1625 assert(app);
ffe60014 1626 assert(ua_sess);
4f3ab6ee 1627 assert(ua_chan);
4f3ab6ee 1628
840cb59c 1629 health_code_update();
4f3ab6ee 1630
7972aab2
DG
1631 DBG("UST app sending channel %s to UST app sock %d", ua_chan->name,
1632 app->sock);
86acf0da 1633
ffe60014
DG
1634 /* Send channel to the application. */
1635 ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
a7169585
MD
1636 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
1637 ret = -ENOTCONN; /* Caused by app exiting. */
1638 goto error;
1639 } else if (ret < 0) {
b551a063
DG
1640 goto error;
1641 }
1642
d88aee68
DG
1643 health_code_update();
1644
ffe60014
DG
1645 /* Send all streams to application. */
1646 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
1647 ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream);
a7169585
MD
1648 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
1649 ret = -ENOTCONN; /* Caused by app exiting. */
1650 goto error;
1651 } else if (ret < 0) {
ffe60014
DG
1652 goto error;
1653 }
1654 /* We don't need the stream anymore once sent to the tracer. */
1655 cds_list_del(&stream->list);
fb45065e 1656 delete_ust_app_stream(-1, stream, app);
ffe60014 1657 }
ffe60014
DG
1658 /* Flag the channel that it is sent to the application. */
1659 ua_chan->is_sent = 1;
ffe60014 1660
b551a063 1661error:
840cb59c 1662 health_code_update();
b551a063
DG
1663 return ret;
1664}
1665
91d76f53 1666/*
5b4a0ec0 1667 * Create the specified event onto the UST tracer for a UST session.
d0b96690
DG
1668 *
1669 * Should be called with session mutex held.
91d76f53 1670 */
edb67388
DG
1671static
1672int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
1673 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
91d76f53 1674{
5b4a0ec0 1675 int ret = 0;
284d8f55 1676
840cb59c 1677 health_code_update();
86acf0da 1678
5b4a0ec0 1679 /* Create UST event on tracer */
fb45065e 1680 pthread_mutex_lock(&app->sock_lock);
852d0037 1681 ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
5b4a0ec0 1682 &ua_event->obj);
fb45065e 1683 pthread_mutex_unlock(&app->sock_lock);
5b4a0ec0 1684 if (ret < 0) {
ffe60014 1685 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
88e3c2f5 1686 abort();
ffe60014
DG
1687 ERR("Error ustctl create event %s for app pid: %d with ret %d",
1688 ua_event->attr.name, app->pid, ret);
1689 } else {
3757b385
DG
1690 /*
1691 * This is normal behavior, an application can die during the
1692 * creation process. Don't report an error so the execution can
1693 * continue normally.
1694 */
1695 ret = 0;
ffe60014
DG
1696 DBG3("UST app create event failed. Application is dead.");
1697 }
5b4a0ec0 1698 goto error;
91d76f53 1699 }
f6a9efaa 1700
5b4a0ec0 1701 ua_event->handle = ua_event->obj->handle;
284d8f55 1702
5b4a0ec0 1703 DBG2("UST app event %s created successfully for pid:%d",
852d0037 1704 ua_event->attr.name, app->pid);
f6a9efaa 1705
840cb59c 1706 health_code_update();
86acf0da 1707
025faf73
DG
1708 /* Set filter if one is present. */
1709 if (ua_event->filter) {
1710 ret = set_ust_event_filter(ua_event, app);
1711 if (ret < 0) {
1712 goto error;
1713 }
1714 }
1715
7cc9a73c
JI
1716 /* Set exclusions for the event */
1717 if (ua_event->exclusion) {
1718 ret = set_ust_event_exclusion(ua_event, app);
1719 if (ret < 0) {
1720 goto error;
1721 }
1722 }
1723
8535a6d9 1724 /* If event not enabled, disable it on the tracer */
40113787
MD
1725 if (ua_event->enabled) {
1726 /*
1727 * We now need to explicitly enable the event, since it
1728 * is now disabled at creation.
1729 */
1730 ret = enable_ust_event(app, ua_sess, ua_event);
1731 if (ret < 0) {
1732 /*
1733 * If we hit an EPERM, something is wrong with our enable call. If
1734 * we get an EEXIST, there is a problem on the tracer side since we
1735 * just created it.
1736 */
1737 switch (ret) {
1738 case -LTTNG_UST_ERR_PERM:
1739 /* Code flow problem */
1740 assert(0);
1741 case -LTTNG_UST_ERR_EXIST:
1742 /* It's OK for our use case. */
1743 ret = 0;
1744 break;
1745 default:
1746 break;
1747 }
1748 goto error;
1749 }
8535a6d9
DG
1750 }
1751
5b4a0ec0 1752error:
840cb59c 1753 health_code_update();
5b4a0ec0 1754 return ret;
91d76f53 1755}
48842b30 1756
5b4a0ec0
DG
1757/*
1758 * Copy data between an UST app event and a LTT event.
1759 */
421cb601 1760static void shadow_copy_event(struct ust_app_event *ua_event,
48842b30
DG
1761 struct ltt_ust_event *uevent)
1762{
b4ffad32
JI
1763 size_t exclusion_alloc_size;
1764
48842b30
DG
1765 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
1766 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
1767
fc34caaa
DG
1768 ua_event->enabled = uevent->enabled;
1769
5b4a0ec0
DG
1770 /* Copy event attributes */
1771 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
1772
53a80697
MD
1773 /* Copy filter bytecode */
1774 if (uevent->filter) {
51755dc8 1775 ua_event->filter = copy_filter_bytecode(uevent->filter);
025faf73 1776 /* Filter might be NULL here in case of ENONEM. */
53a80697 1777 }
b4ffad32
JI
1778
1779 /* Copy exclusion data */
1780 if (uevent->exclusion) {
51755dc8 1781 exclusion_alloc_size = sizeof(struct lttng_event_exclusion) +
b4ffad32
JI
1782 LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count;
1783 ua_event->exclusion = zmalloc(exclusion_alloc_size);
5f8df26c
JI
1784 if (ua_event->exclusion == NULL) {
1785 PERROR("malloc");
1786 } else {
1787 memcpy(ua_event->exclusion, uevent->exclusion,
1788 exclusion_alloc_size);
b4ffad32
JI
1789 }
1790 }
48842b30
DG
1791}
1792
5b4a0ec0
DG
1793/*
1794 * Copy data between an UST app channel and a LTT channel.
1795 */
421cb601 1796static void shadow_copy_channel(struct ust_app_channel *ua_chan,
48842b30
DG
1797 struct ltt_ust_channel *uchan)
1798{
fc34caaa 1799 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
48842b30
DG
1800
1801 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
1802 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
ffe60014 1803
1624d5b7
JD
1804 ua_chan->tracefile_size = uchan->tracefile_size;
1805 ua_chan->tracefile_count = uchan->tracefile_count;
1806
ffe60014
DG
1807 /* Copy event attributes since the layout is different. */
1808 ua_chan->attr.subbuf_size = uchan->attr.subbuf_size;
1809 ua_chan->attr.num_subbuf = uchan->attr.num_subbuf;
1810 ua_chan->attr.overwrite = uchan->attr.overwrite;
1811 ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval;
1812 ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval;
e9404c27 1813 ua_chan->monitor_timer_interval = uchan->monitor_timer_interval;
ffe60014 1814 ua_chan->attr.output = uchan->attr.output;
491d1539
MD
1815 ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout;
1816
ffe60014
DG
1817 /*
1818 * Note that the attribute channel type is not set since the channel on the
1819 * tracing registry side does not have this information.
1820 */
48842b30 1821
fc34caaa 1822 ua_chan->enabled = uchan->enabled;
7972aab2 1823 ua_chan->tracing_channel_id = uchan->id;
fc34caaa 1824
fc34caaa 1825 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
48842b30
DG
1826}
1827
5b4a0ec0
DG
1828/*
1829 * Copy data between a UST app session and a regular LTT session.
1830 */
421cb601 1831static void shadow_copy_session(struct ust_app_session *ua_sess,
bec39940 1832 struct ltt_ust_session *usess, struct ust_app *app)
48842b30 1833{
477d7741
MD
1834 time_t rawtime;
1835 struct tm *timeinfo;
1836 char datetime[16];
1837 int ret;
d7ba1388 1838 char tmp_shm_path[PATH_MAX];
477d7741
MD
1839
1840 /* Get date and time for unique app path */
1841 time(&rawtime);
1842 timeinfo = localtime(&rawtime);
1843 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
48842b30 1844
421cb601 1845 DBG2("Shadow copy of session handle %d", ua_sess->handle);
48842b30 1846
7972aab2
DG
1847 ua_sess->tracing_id = usess->id;
1848 ua_sess->id = get_next_session_id();
1849 ua_sess->uid = app->uid;
1850 ua_sess->gid = app->gid;
1851 ua_sess->euid = usess->uid;
1852 ua_sess->egid = usess->gid;
1853 ua_sess->buffer_type = usess->buffer_type;
1854 ua_sess->bits_per_long = app->bits_per_long;
6addfa37 1855
7972aab2 1856 /* There is only one consumer object per session possible. */
6addfa37 1857 consumer_output_get(usess->consumer);
7972aab2 1858 ua_sess->consumer = usess->consumer;
6addfa37 1859
2bba9e53 1860 ua_sess->output_traces = usess->output_traces;
ecc48a90 1861 ua_sess->live_timer_interval = usess->live_timer_interval;
84ad93e8
DG
1862 copy_channel_attr_to_ustctl(&ua_sess->metadata_attr,
1863 &usess->metadata_attr);
7972aab2
DG
1864
1865 switch (ua_sess->buffer_type) {
1866 case LTTNG_BUFFER_PER_PID:
1867 ret = snprintf(ua_sess->path, sizeof(ua_sess->path),
dec56f6c 1868 DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid,
7972aab2
DG
1869 datetime);
1870 break;
1871 case LTTNG_BUFFER_PER_UID:
1872 ret = snprintf(ua_sess->path, sizeof(ua_sess->path),
1873 DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long);
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
MD
1925static
1926void __lookup_session_by_app(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
DG
1937static struct ust_app_session *lookup_session_by_app(
1938 struct ltt_ust_session *usess, struct ust_app *app)
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
MD
1992 app->uint64_t_alignment, app->long_alignment,
1993 app->byte_order, app->version.major,
3d071855
MD
1994 app->version.minor, reg_pid->root_shm_path,
1995 reg_pid->shm_path,
d7ba1388 1996 ua_sess->euid, ua_sess->egid);
7972aab2 1997 if (ret < 0) {
286c991a
MD
1998 /*
1999 * reg_pid->registry->reg.ust is NULL upon error, so we need to
2000 * destroy the buffer registry, because it is always expected
2001 * that if the buffer registry can be found, its ust registry is
2002 * non-NULL.
2003 */
2004 buffer_reg_pid_destroy(reg_pid);
7972aab2
DG
2005 goto error;
2006 }
2007
286c991a
MD
2008 buffer_reg_pid_add(reg_pid);
2009
7972aab2
DG
2010 DBG3("UST app buffer registry per PID created successfully");
2011
2012end:
2013 if (regp) {
2014 *regp = reg_pid;
2015 }
2016error:
2017 rcu_read_unlock();
2018 return ret;
2019}
2020
2021/*
2022 * Setup buffer registry per UID for the given session and application. If none
2023 * is found, a new one is created, added to the global registry and
2024 * initialized. If regp is valid, it's set with the newly created object.
2025 *
2026 * Return 0 on success or else a negative value.
2027 */
2028static int setup_buffer_reg_uid(struct ltt_ust_session *usess,
d7ba1388 2029 struct ust_app_session *ua_sess,
7972aab2
DG
2030 struct ust_app *app, struct buffer_reg_uid **regp)
2031{
2032 int ret = 0;
2033 struct buffer_reg_uid *reg_uid;
2034
2035 assert(usess);
2036 assert(app);
2037
2038 rcu_read_lock();
2039
2040 reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid);
2041 if (!reg_uid) {
2042 /*
2043 * This is the create channel path meaning that if there is NO
2044 * registry available, we have to create one for this session.
2045 */
2046 ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid,
3d071855
MD
2047 LTTNG_DOMAIN_UST, &reg_uid,
2048 ua_sess->root_shm_path, ua_sess->shm_path);
7972aab2
DG
2049 if (ret < 0) {
2050 goto error;
2051 }
7972aab2
DG
2052 } else {
2053 goto end;
2054 }
2055
2056 /* Initialize registry. */
af6142cf 2057 ret = ust_registry_session_init(&reg_uid->registry->reg.ust, NULL,
7972aab2
DG
2058 app->bits_per_long, app->uint8_t_alignment,
2059 app->uint16_t_alignment, app->uint32_t_alignment,
af6142cf
MD
2060 app->uint64_t_alignment, app->long_alignment,
2061 app->byte_order, app->version.major,
3d071855
MD
2062 app->version.minor, reg_uid->root_shm_path,
2063 reg_uid->shm_path, usess->uid, usess->gid);
7972aab2 2064 if (ret < 0) {
286c991a
MD
2065 /*
2066 * reg_uid->registry->reg.ust is NULL upon error, so we need to
2067 * destroy the buffer registry, because it is always expected
2068 * that if the buffer registry can be found, its ust registry is
2069 * non-NULL.
2070 */
2071 buffer_reg_uid_destroy(reg_uid, NULL);
7972aab2
DG
2072 goto error;
2073 }
2074 /* Add node to teardown list of the session. */
2075 cds_list_add(&reg_uid->lnode, &usess->buffer_reg_uid_list);
2076
286c991a 2077 buffer_reg_uid_add(reg_uid);
7972aab2 2078
286c991a 2079 DBG3("UST app buffer registry per UID created successfully");
7972aab2
DG
2080end:
2081 if (regp) {
2082 *regp = reg_uid;
2083 }
2084error:
2085 rcu_read_unlock();
2086 return ret;
2087}
2088
421cb601 2089/*
3d8ca23b 2090 * Create a session on the tracer side for the given app.
421cb601 2091 *
3d8ca23b
DG
2092 * On success, ua_sess_ptr is populated with the session pointer or else left
2093 * untouched. If the session was created, is_created is set to 1. On error,
2094 * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can
2095 * be NULL.
2096 *
2097 * Returns 0 on success or else a negative code which is either -ENOMEM or
2098 * -ENOTCONN which is the default code if the ustctl_create_session fails.
421cb601 2099 */
03f91eaa 2100static int find_or_create_ust_app_session(struct ltt_ust_session *usess,
3d8ca23b
DG
2101 struct ust_app *app, struct ust_app_session **ua_sess_ptr,
2102 int *is_created)
421cb601 2103{
3d8ca23b 2104 int ret, created = 0;
421cb601
DG
2105 struct ust_app_session *ua_sess;
2106
3d8ca23b
DG
2107 assert(usess);
2108 assert(app);
2109 assert(ua_sess_ptr);
2110
840cb59c 2111 health_code_update();
86acf0da 2112
421cb601
DG
2113 ua_sess = lookup_session_by_app(usess, app);
2114 if (ua_sess == NULL) {
d9bf3ca4 2115 DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it",
852d0037 2116 app->pid, usess->id);
40bbd087 2117 ua_sess = alloc_ust_app_session();
421cb601
DG
2118 if (ua_sess == NULL) {
2119 /* Only malloc can failed so something is really wrong */
3d8ca23b
DG
2120 ret = -ENOMEM;
2121 goto error;
421cb601 2122 }
477d7741 2123 shadow_copy_session(ua_sess, usess, app);
3d8ca23b 2124 created = 1;
421cb601
DG
2125 }
2126
7972aab2
DG
2127 switch (usess->buffer_type) {
2128 case LTTNG_BUFFER_PER_PID:
2129 /* Init local registry. */
2130 ret = setup_buffer_reg_pid(ua_sess, app, NULL);
421cb601 2131 if (ret < 0) {
e64207cf 2132 delete_ust_app_session(-1, ua_sess, app);
7972aab2
DG
2133 goto error;
2134 }
2135 break;
2136 case LTTNG_BUFFER_PER_UID:
2137 /* Look for a global registry. If none exists, create one. */
d7ba1388 2138 ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL);
7972aab2 2139 if (ret < 0) {
e64207cf 2140 delete_ust_app_session(-1, ua_sess, app);
7972aab2
DG
2141 goto error;
2142 }
2143 break;
2144 default:
2145 assert(0);
2146 ret = -EINVAL;
2147 goto error;
2148 }
2149
2150 health_code_update();
2151
2152 if (ua_sess->handle == -1) {
fb45065e 2153 pthread_mutex_lock(&app->sock_lock);
7972aab2 2154 ret = ustctl_create_session(app->sock);
fb45065e 2155 pthread_mutex_unlock(&app->sock_lock);
7972aab2
DG
2156 if (ret < 0) {
2157 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
2158 ERR("Creating session for app pid %d with ret %d",
ffe60014
DG
2159 app->pid, ret);
2160 } else {
2161 DBG("UST app creating session failed. Application is dead");
3757b385
DG
2162 /*
2163 * This is normal behavior, an application can die during the
2164 * creation process. Don't report an error so the execution can
2165 * continue normally. This will get flagged ENOTCONN and the
2166 * caller will handle it.
2167 */
2168 ret = 0;
ffe60014 2169 }
d0b96690 2170 delete_ust_app_session(-1, ua_sess, app);
3d8ca23b
DG
2171 if (ret != -ENOMEM) {
2172 /*
2173 * Tracer is probably gone or got an internal error so let's
2174 * behave like it will soon unregister or not usable.
2175 */
2176 ret = -ENOTCONN;
2177 }
2178 goto error;
421cb601
DG
2179 }
2180
7972aab2
DG
2181 ua_sess->handle = ret;
2182
2183 /* Add ust app session to app's HT */
d9bf3ca4
MD
2184 lttng_ht_node_init_u64(&ua_sess->node,
2185 ua_sess->tracing_id);
2186 lttng_ht_add_unique_u64(app->sessions, &ua_sess->node);
10b56aef
MD
2187 lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle);
2188 lttng_ht_add_unique_ulong(app->ust_sessions_objd,
2189 &ua_sess->ust_objd_node);
7972aab2
DG
2190
2191 DBG2("UST app session created successfully with handle %d", ret);
2192 }
2193
2194 *ua_sess_ptr = ua_sess;
2195 if (is_created) {
2196 *is_created = created;
2197 }
2198
2199 /* Everything went well. */
2200 ret = 0;
2201
2202error:
2203 health_code_update();
2204 return ret;
2205}
2206
6a6b2068
JG
2207/*
2208 * Match function for a hash table lookup of ust_app_ctx.
2209 *
2210 * It matches an ust app context based on the context type and, in the case
2211 * of perf counters, their name.
2212 */
2213static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key)
2214{
2215 struct ust_app_ctx *ctx;
bdf64013 2216 const struct lttng_ust_context_attr *key;
6a6b2068
JG
2217
2218 assert(node);
2219 assert(_key);
2220
2221 ctx = caa_container_of(node, struct ust_app_ctx, node.node);
2222 key = _key;
2223
2224 /* Context type */
2225 if (ctx->ctx.ctx != key->ctx) {
2226 goto no_match;
2227 }
2228
bdf64013
JG
2229 switch(key->ctx) {
2230 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER:
6a6b2068 2231 if (strncmp(key->u.perf_counter.name,
bdf64013
JG
2232 ctx->ctx.u.perf_counter.name,
2233 sizeof(key->u.perf_counter.name))) {
2234 goto no_match;
2235 }
2236 break;
2237 case LTTNG_UST_CONTEXT_APP_CONTEXT:
2238 if (strcmp(key->u.app_ctx.provider_name,
2239 ctx->ctx.u.app_ctx.provider_name) ||
2240 strcmp(key->u.app_ctx.ctx_name,
2241 ctx->ctx.u.app_ctx.ctx_name)) {
6a6b2068
JG
2242 goto no_match;
2243 }
bdf64013
JG
2244 break;
2245 default:
2246 break;
6a6b2068
JG
2247 }
2248
2249 /* Match. */
2250 return 1;
2251
2252no_match:
2253 return 0;
2254}
2255
2256/*
2257 * Lookup for an ust app context from an lttng_ust_context.
2258 *
be184a0f 2259 * Must be called while holding RCU read side lock.
6a6b2068
JG
2260 * Return an ust_app_ctx object or NULL on error.
2261 */
2262static
2263struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht,
bdf64013 2264 struct lttng_ust_context_attr *uctx)
6a6b2068
JG
2265{
2266 struct lttng_ht_iter iter;
2267 struct lttng_ht_node_ulong *node;
2268 struct ust_app_ctx *app_ctx = NULL;
2269
2270 assert(uctx);
2271 assert(ht);
2272
2273 /* Lookup using the lttng_ust_context_type and a custom match fct. */
2274 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed),
2275 ht_match_ust_app_ctx, uctx, &iter.iter);
2276 node = lttng_ht_iter_get_node_ulong(&iter);
2277 if (!node) {
2278 goto end;
2279 }
2280
2281 app_ctx = caa_container_of(node, struct ust_app_ctx, node);
2282
2283end:
2284 return app_ctx;
2285}
2286
7972aab2
DG
2287/*
2288 * Create a context for the channel on the tracer.
2289 *
2290 * Called with UST app session lock held and a RCU read side lock.
2291 */
2292static
c9edf082 2293int create_ust_app_channel_context(struct ust_app_channel *ua_chan,
bdf64013 2294 struct lttng_ust_context_attr *uctx,
7972aab2
DG
2295 struct ust_app *app)
2296{
2297 int ret = 0;
7972aab2
DG
2298 struct ust_app_ctx *ua_ctx;
2299
2300 DBG2("UST app adding context to channel %s", ua_chan->name);
2301
6a6b2068
JG
2302 ua_ctx = find_ust_app_context(ua_chan->ctx, uctx);
2303 if (ua_ctx) {
7972aab2
DG
2304 ret = -EEXIST;
2305 goto error;
2306 }
2307
2308 ua_ctx = alloc_ust_app_ctx(uctx);
2309 if (ua_ctx == NULL) {
2310 /* malloc failed */
7682f304 2311 ret = -ENOMEM;
7972aab2
DG
2312 goto error;
2313 }
2314
2315 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
aa3514e9 2316 lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node);
31746f93 2317 cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list);
7972aab2
DG
2318
2319 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2320 if (ret < 0) {
2321 goto error;
2322 }
2323
2324error:
2325 return ret;
2326}
2327
2328/*
2329 * Enable on the tracer side a ust app event for the session and channel.
2330 *
2331 * Called with UST app session lock held.
2332 */
2333static
2334int enable_ust_app_event(struct ust_app_session *ua_sess,
2335 struct ust_app_event *ua_event, struct ust_app *app)
2336{
2337 int ret;
2338
2339 ret = enable_ust_event(app, ua_sess, ua_event);
2340 if (ret < 0) {
2341 goto error;
2342 }
2343
2344 ua_event->enabled = 1;
2345
2346error:
2347 return ret;
2348}
2349
2350/*
2351 * Disable on the tracer side a ust app event for the session and channel.
2352 */
2353static int disable_ust_app_event(struct ust_app_session *ua_sess,
2354 struct ust_app_event *ua_event, struct ust_app *app)
2355{
2356 int ret;
2357
2358 ret = disable_ust_event(app, ua_sess, ua_event);
2359 if (ret < 0) {
2360 goto error;
2361 }
2362
2363 ua_event->enabled = 0;
2364
2365error:
2366 return ret;
2367}
2368
2369/*
2370 * Lookup ust app channel for session and disable it on the tracer side.
2371 */
2372static
2373int disable_ust_app_channel(struct ust_app_session *ua_sess,
2374 struct ust_app_channel *ua_chan, struct ust_app *app)
2375{
2376 int ret;
2377
2378 ret = disable_ust_channel(app, ua_sess, ua_chan);
2379 if (ret < 0) {
2380 goto error;
2381 }
2382
2383 ua_chan->enabled = 0;
2384
2385error:
2386 return ret;
2387}
2388
2389/*
2390 * Lookup ust app channel for session and enable it on the tracer side. This
2391 * MUST be called with a RCU read side lock acquired.
2392 */
2393static int enable_ust_app_channel(struct ust_app_session *ua_sess,
2394 struct ltt_ust_channel *uchan, struct ust_app *app)
2395{
2396 int ret = 0;
2397 struct lttng_ht_iter iter;
2398 struct lttng_ht_node_str *ua_chan_node;
2399 struct ust_app_channel *ua_chan;
2400
2401 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2402 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2403 if (ua_chan_node == NULL) {
d9bf3ca4 2404 DBG2("Unable to find channel %s in ust session id %" PRIu64,
7972aab2
DG
2405 uchan->name, ua_sess->tracing_id);
2406 goto error;
2407 }
2408
2409 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2410
2411 ret = enable_ust_channel(app, ua_sess, ua_chan);
2412 if (ret < 0) {
2413 goto error;
2414 }
2415
2416error:
2417 return ret;
2418}
2419
2420/*
2421 * Ask the consumer to create a channel and get it if successful.
2422 *
fad1ed2f
JR
2423 * Called with UST app session lock held.
2424 *
7972aab2
DG
2425 * Return 0 on success or else a negative value.
2426 */
2427static int do_consumer_create_channel(struct ltt_ust_session *usess,
2428 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan,
e098433c
JG
2429 int bitness, struct ust_registry_session *registry,
2430 uint64_t trace_archive_id)
7972aab2
DG
2431{
2432 int ret;
2433 unsigned int nb_fd = 0;
2434 struct consumer_socket *socket;
2435
2436 assert(usess);
2437 assert(ua_sess);
2438 assert(ua_chan);
2439 assert(registry);
2440
2441 rcu_read_lock();
2442 health_code_update();
2443
2444 /* Get the right consumer socket for the application. */
2445 socket = consumer_find_socket_by_bitness(bitness, usess->consumer);
2446 if (!socket) {
2447 ret = -EINVAL;
2448 goto error;
2449 }
2450
2451 health_code_update();
2452
2453 /* Need one fd for the channel. */
2454 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2455 if (ret < 0) {
2456 ERR("Exhausted number of available FD upon create channel");
2457 goto error;
2458 }
2459
2460 /*
2461 * Ask consumer to create channel. The consumer will return the number of
2462 * stream we have to expect.
2463 */
2464 ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket,
e098433c 2465 registry, trace_archive_id);
7972aab2
DG
2466 if (ret < 0) {
2467 goto error_ask;
2468 }
2469
2470 /*
2471 * Compute the number of fd needed before receiving them. It must be 2 per
2472 * stream (2 being the default value here).
2473 */
2474 nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count;
2475
2476 /* Reserve the amount of file descriptor we need. */
2477 ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd);
2478 if (ret < 0) {
2479 ERR("Exhausted number of available FD upon create channel");
2480 goto error_fd_get_stream;
2481 }
2482
2483 health_code_update();
2484
2485 /*
2486 * Now get the channel from the consumer. This call wil populate the stream
2487 * list of that channel and set the ust objects.
2488 */
d9078d0c
DG
2489 if (usess->consumer->enabled) {
2490 ret = ust_consumer_get_channel(socket, ua_chan);
2491 if (ret < 0) {
2492 goto error_destroy;
2493 }
7972aab2
DG
2494 }
2495
2496 rcu_read_unlock();
2497 return 0;
2498
2499error_destroy:
2500 lttng_fd_put(LTTNG_FD_APPS, nb_fd);
2501error_fd_get_stream:
2502 /*
2503 * Initiate a destroy channel on the consumer since we had an error
2504 * handling it on our side. The return value is of no importance since we
2505 * already have a ret value set by the previous error that we need to
2506 * return.
2507 */
2508 (void) ust_consumer_destroy_channel(socket, ua_chan);
2509error_ask:
2510 lttng_fd_put(LTTNG_FD_APPS, 1);
2511error:
2512 health_code_update();
2513 rcu_read_unlock();
2514 return ret;
2515}
2516
2517/*
2518 * Duplicate the ust data object of the ust app stream and save it in the
2519 * buffer registry stream.
2520 *
2521 * Return 0 on success or else a negative value.
2522 */
2523static int duplicate_stream_object(struct buffer_reg_stream *reg_stream,
2524 struct ust_app_stream *stream)
2525{
2526 int ret;
2527
2528 assert(reg_stream);
2529 assert(stream);
2530
2531 /* Reserve the amount of file descriptor we need. */
2532 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2533 if (ret < 0) {
2534 ERR("Exhausted number of available FD upon duplicate stream");
2535 goto error;
2536 }
2537
2538 /* Duplicate object for stream once the original is in the registry. */
2539 ret = ustctl_duplicate_ust_object_data(&stream->obj,
2540 reg_stream->obj.ust);
2541 if (ret < 0) {
2542 ERR("Duplicate stream obj from %p to %p failed with ret %d",
2543 reg_stream->obj.ust, stream->obj, ret);
2544 lttng_fd_put(LTTNG_FD_APPS, 2);
2545 goto error;
2546 }
2547 stream->handle = stream->obj->handle;
2548
2549error:
2550 return ret;
2551}
2552
2553/*
2554 * Duplicate the ust data object of the ust app. channel and save it in the
2555 * buffer registry channel.
2556 *
2557 * Return 0 on success or else a negative value.
2558 */
2559static int duplicate_channel_object(struct buffer_reg_channel *reg_chan,
2560 struct ust_app_channel *ua_chan)
2561{
2562 int ret;
2563
2564 assert(reg_chan);
2565 assert(ua_chan);
2566
2567 /* Need two fds for the channel. */
2568 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2569 if (ret < 0) {
2570 ERR("Exhausted number of available FD upon duplicate channel");
2571 goto error_fd_get;
2572 }
2573
2574 /* Duplicate object for stream once the original is in the registry. */
2575 ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust);
2576 if (ret < 0) {
2577 ERR("Duplicate channel obj from %p to %p failed with ret: %d",
2578 reg_chan->obj.ust, ua_chan->obj, ret);
2579 goto error;
2580 }
2581 ua_chan->handle = ua_chan->obj->handle;
2582
2583 return 0;
2584
2585error:
2586 lttng_fd_put(LTTNG_FD_APPS, 1);
2587error_fd_get:
2588 return ret;
2589}
2590
2591/*
2592 * For a given channel buffer registry, setup all streams of the given ust
2593 * application channel.
2594 *
2595 * Return 0 on success or else a negative value.
2596 */
2597static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan,
fb45065e
MD
2598 struct ust_app_channel *ua_chan,
2599 struct ust_app *app)
7972aab2
DG
2600{
2601 int ret = 0;
2602 struct ust_app_stream *stream, *stmp;
2603
2604 assert(reg_chan);
2605 assert(ua_chan);
2606
2607 DBG2("UST app setup buffer registry stream");
2608
2609 /* Send all streams to application. */
2610 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
2611 struct buffer_reg_stream *reg_stream;
2612
2613 ret = buffer_reg_stream_create(&reg_stream);
2614 if (ret < 0) {
2615 goto error;
2616 }
2617
2618 /*
2619 * Keep original pointer and nullify it in the stream so the delete
2620 * stream call does not release the object.
2621 */
2622 reg_stream->obj.ust = stream->obj;
2623 stream->obj = NULL;
2624 buffer_reg_stream_add(reg_stream, reg_chan);
421cb601 2625
7972aab2
DG
2626 /* We don't need the streams anymore. */
2627 cds_list_del(&stream->list);
fb45065e 2628 delete_ust_app_stream(-1, stream, app);
7972aab2 2629 }
421cb601 2630
7972aab2
DG
2631error:
2632 return ret;
2633}
2634
2635/*
2636 * Create a buffer registry channel for the given session registry and
2637 * application channel object. If regp pointer is valid, it's set with the
2638 * created object. Important, the created object is NOT added to the session
2639 * registry hash table.
2640 *
2641 * Return 0 on success else a negative value.
2642 */
2643static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess,
2644 struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp)
2645{
2646 int ret;
2647 struct buffer_reg_channel *reg_chan = NULL;
2648
2649 assert(reg_sess);
2650 assert(ua_chan);
2651
2652 DBG2("UST app creating buffer registry channel for %s", ua_chan->name);
2653
2654 /* Create buffer registry channel. */
2655 ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, &reg_chan);
2656 if (ret < 0) {
2657 goto error_create;
421cb601 2658 }
7972aab2
DG
2659 assert(reg_chan);
2660 reg_chan->consumer_key = ua_chan->key;
8c924c7b 2661 reg_chan->subbuf_size = ua_chan->attr.subbuf_size;
d07ceecd 2662 reg_chan->num_subbuf = ua_chan->attr.num_subbuf;
421cb601 2663
7972aab2
DG
2664 /* Create and add a channel registry to session. */
2665 ret = ust_registry_channel_add(reg_sess->reg.ust,
2666 ua_chan->tracing_channel_id);
2667 if (ret < 0) {
2668 goto error;
d88aee68 2669 }
7972aab2 2670 buffer_reg_channel_add(reg_sess, reg_chan);
d88aee68 2671
7972aab2
DG
2672 if (regp) {
2673 *regp = reg_chan;
3d8ca23b 2674 }
d88aee68 2675
7972aab2 2676 return 0;
3d8ca23b
DG
2677
2678error:
7972aab2
DG
2679 /* Safe because the registry channel object was not added to any HT. */
2680 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
2681error_create:
3d8ca23b 2682 return ret;
421cb601
DG
2683}
2684
55cc08a6 2685/*
7972aab2
DG
2686 * Setup buffer registry channel for the given session registry and application
2687 * channel object. If regp pointer is valid, it's set with the created object.
d0b96690 2688 *
7972aab2 2689 * Return 0 on success else a negative value.
55cc08a6 2690 */
7972aab2 2691static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess,
fb45065e
MD
2692 struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan,
2693 struct ust_app *app)
55cc08a6 2694{
7972aab2 2695 int ret;
55cc08a6 2696
7972aab2
DG
2697 assert(reg_sess);
2698 assert(reg_chan);
2699 assert(ua_chan);
2700 assert(ua_chan->obj);
55cc08a6 2701
7972aab2 2702 DBG2("UST app setup buffer registry channel for %s", ua_chan->name);
55cc08a6 2703
7972aab2 2704 /* Setup all streams for the registry. */
fb45065e 2705 ret = setup_buffer_reg_streams(reg_chan, ua_chan, app);
7972aab2 2706 if (ret < 0) {
55cc08a6
DG
2707 goto error;
2708 }
2709
7972aab2
DG
2710 reg_chan->obj.ust = ua_chan->obj;
2711 ua_chan->obj = NULL;
55cc08a6 2712
7972aab2 2713 return 0;
55cc08a6
DG
2714
2715error:
7972aab2
DG
2716 buffer_reg_channel_remove(reg_sess, reg_chan);
2717 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
55cc08a6
DG
2718 return ret;
2719}
2720
edb67388 2721/*
7972aab2 2722 * Send buffer registry channel to the application.
d0b96690 2723 *
7972aab2 2724 * Return 0 on success else a negative value.
edb67388 2725 */
7972aab2
DG
2726static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan,
2727 struct ust_app *app, struct ust_app_session *ua_sess,
2728 struct ust_app_channel *ua_chan)
edb67388
DG
2729{
2730 int ret;
7972aab2 2731 struct buffer_reg_stream *reg_stream;
edb67388 2732
7972aab2
DG
2733 assert(reg_chan);
2734 assert(app);
2735 assert(ua_sess);
2736 assert(ua_chan);
2737
2738 DBG("UST app sending buffer registry channel to ust sock %d", app->sock);
2739
2740 ret = duplicate_channel_object(reg_chan, ua_chan);
edb67388
DG
2741 if (ret < 0) {
2742 goto error;
2743 }
2744
7972aab2
DG
2745 /* Send channel to the application. */
2746 ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
a7169585
MD
2747 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
2748 ret = -ENOTCONN; /* Caused by app exiting. */
2749 goto error;
2750 } else if (ret < 0) {
7972aab2
DG
2751 goto error;
2752 }
2753
2754 health_code_update();
2755
2756 /* Send all streams to application. */
2757 pthread_mutex_lock(&reg_chan->stream_list_lock);
2758 cds_list_for_each_entry(reg_stream, &reg_chan->streams, lnode) {
2759 struct ust_app_stream stream;
2760
2761 ret = duplicate_stream_object(reg_stream, &stream);
2762 if (ret < 0) {
2763 goto error_stream_unlock;
2764 }
2765
2766 ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream);
2767 if (ret < 0) {
fb45065e 2768 (void) release_ust_app_stream(-1, &stream, app);
a7169585
MD
2769 if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
2770 ret = -ENOTCONN; /* Caused by app exiting. */
a7169585 2771 }
7972aab2
DG
2772 goto error_stream_unlock;
2773 }
edb67388 2774
7972aab2
DG
2775 /*
2776 * The return value is not important here. This function will output an
2777 * error if needed.
2778 */
fb45065e 2779 (void) release_ust_app_stream(-1, &stream, app);
7972aab2
DG
2780 }
2781 ua_chan->is_sent = 1;
2782
2783error_stream_unlock:
2784 pthread_mutex_unlock(&reg_chan->stream_list_lock);
edb67388
DG
2785error:
2786 return ret;
2787}
2788
9730260e 2789/*
7972aab2
DG
2790 * Create and send to the application the created buffers with per UID buffers.
2791 *
9acdc1d6 2792 * This MUST be called with a RCU read side lock acquired.
71e0a100 2793 * The session list lock and the session's lock must be acquired.
9acdc1d6 2794 *
7972aab2 2795 * Return 0 on success else a negative value.
9730260e 2796 */
7972aab2
DG
2797static int create_channel_per_uid(struct ust_app *app,
2798 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2799 struct ust_app_channel *ua_chan)
9730260e
DG
2800{
2801 int ret;
7972aab2
DG
2802 struct buffer_reg_uid *reg_uid;
2803 struct buffer_reg_channel *reg_chan;
e32d7f27 2804 struct ltt_session *session = NULL;
e098433c
JG
2805 enum lttng_error_code notification_ret;
2806 struct ust_registry_channel *chan_reg;
9730260e 2807
7972aab2
DG
2808 assert(app);
2809 assert(usess);
2810 assert(ua_sess);
2811 assert(ua_chan);
2812
2813 DBG("UST app creating channel %s with per UID buffers", ua_chan->name);
2814
2815 reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid);
2816 /*
2817 * The session creation handles the creation of this global registry
2818 * object. If none can be find, there is a code flow problem or a
2819 * teardown race.
2820 */
2821 assert(reg_uid);
2822
2823 reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id,
2824 reg_uid);
2721f7ea
JG
2825 if (reg_chan) {
2826 goto send_channel;
2827 }
7972aab2 2828
2721f7ea
JG
2829 /* Create the buffer registry channel object. */
2830 ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, &reg_chan);
2831 if (ret < 0) {
2832 ERR("Error creating the UST channel \"%s\" registry instance",
f14256d6 2833 ua_chan->name);
2721f7ea
JG
2834 goto error;
2835 }
f14256d6 2836
e098433c
JG
2837 session = session_find_by_id(ua_sess->tracing_id);
2838 assert(session);
2839 assert(pthread_mutex_trylock(&session->lock));
2840 assert(session_trylock_list());
2841
2721f7ea
JG
2842 /*
2843 * Create the buffers on the consumer side. This call populates the
2844 * ust app channel object with all streams and data object.
2845 */
2846 ret = do_consumer_create_channel(usess, ua_sess, ua_chan,
e098433c
JG
2847 app->bits_per_long, reg_uid->registry->reg.ust,
2848 session->current_archive_id);
2721f7ea
JG
2849 if (ret < 0) {
2850 ERR("Error creating UST channel \"%s\" on the consumer daemon",
2851 ua_chan->name);
7972aab2
DG
2852
2853 /*
2721f7ea
JG
2854 * Let's remove the previously created buffer registry channel so
2855 * it's not visible anymore in the session registry.
7972aab2 2856 */
2721f7ea
JG
2857 ust_registry_channel_del_free(reg_uid->registry->reg.ust,
2858 ua_chan->tracing_channel_id, false);
2859 buffer_reg_channel_remove(reg_uid->registry, reg_chan);
2860 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
2861 goto error;
7972aab2
DG
2862 }
2863
2721f7ea
JG
2864 /*
2865 * Setup the streams and add it to the session registry.
2866 */
2867 ret = setup_buffer_reg_channel(reg_uid->registry,
2868 ua_chan, reg_chan, app);
2869 if (ret < 0) {
2870 ERR("Error setting up UST channel \"%s\"", ua_chan->name);
2871 goto error;
2872 }
2873
e098433c
JG
2874 /* Notify the notification subsystem of the channel's creation. */
2875 pthread_mutex_lock(&reg_uid->registry->reg.ust->lock);
2876 chan_reg = ust_registry_channel_find(reg_uid->registry->reg.ust,
2877 ua_chan->tracing_channel_id);
2878 assert(chan_reg);
2879 chan_reg->consumer_key = ua_chan->key;
2880 chan_reg = NULL;
2881 pthread_mutex_unlock(&reg_uid->registry->reg.ust->lock);
e9404c27 2882
e098433c
JG
2883 notification_ret = notification_thread_command_add_channel(
2884 notification_thread_handle, session->name,
2885 ua_sess->euid, ua_sess->egid,
2886 ua_chan->name,
2887 ua_chan->key,
2888 LTTNG_DOMAIN_UST,
2889 ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf);
2890 if (notification_ret != LTTNG_OK) {
2891 ret = - (int) notification_ret;
2892 ERR("Failed to add channel to notification thread");
2893 goto error;
e9404c27
JG
2894 }
2895
2721f7ea 2896send_channel:
66ff8e3f
JG
2897 /* Send buffers to the application. */
2898 ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan);
2899 if (ret < 0) {
2900 if (ret != -ENOTCONN) {
2901 ERR("Error sending channel to application");
2902 }
2903 goto error;
2904 }
2905
9730260e 2906error:
e32d7f27
JG
2907 if (session) {
2908 session_put(session);
2909 }
9730260e
DG
2910 return ret;
2911}
2912
78f0bacd 2913/*
7972aab2
DG
2914 * Create and send to the application the created buffers with per PID buffers.
2915 *
fad1ed2f 2916 * Called with UST app session lock held.
71e0a100 2917 * The session list lock and the session's lock must be acquired.
fad1ed2f 2918 *
7972aab2 2919 * Return 0 on success else a negative value.
78f0bacd 2920 */
7972aab2
DG
2921static int create_channel_per_pid(struct ust_app *app,
2922 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2923 struct ust_app_channel *ua_chan)
78f0bacd 2924{
8535a6d9 2925 int ret;
7972aab2 2926 struct ust_registry_session *registry;
e9404c27 2927 enum lttng_error_code cmd_ret;
e32d7f27 2928 struct ltt_session *session = NULL;
e9404c27
JG
2929 uint64_t chan_reg_key;
2930 struct ust_registry_channel *chan_reg;
78f0bacd 2931
7972aab2
DG
2932 assert(app);
2933 assert(usess);
2934 assert(ua_sess);
2935 assert(ua_chan);
2936
2937 DBG("UST app creating channel %s with per PID buffers", ua_chan->name);
2938
2939 rcu_read_lock();
2940
2941 registry = get_session_registry(ua_sess);
fad1ed2f 2942 /* The UST app session lock is held, registry shall not be null. */
7972aab2
DG
2943 assert(registry);
2944
2945 /* Create and add a new channel registry to session. */
2946 ret = ust_registry_channel_add(registry, ua_chan->key);
78f0bacd 2947 if (ret < 0) {
f14256d6
MD
2948 ERR("Error creating the UST channel \"%s\" registry instance",
2949 ua_chan->name);
78f0bacd
DG
2950 goto error;
2951 }
2952
e098433c
JG
2953 session = session_find_by_id(ua_sess->tracing_id);
2954 assert(session);
2955
2956 assert(pthread_mutex_trylock(&session->lock));
2957 assert(session_trylock_list());
2958
7972aab2
DG
2959 /* Create and get channel on the consumer side. */
2960 ret = do_consumer_create_channel(usess, ua_sess, ua_chan,
e098433c
JG
2961 app->bits_per_long, registry,
2962 session->current_archive_id);
7972aab2 2963 if (ret < 0) {
f14256d6
MD
2964 ERR("Error creating UST channel \"%s\" on the consumer daemon",
2965 ua_chan->name);
5b951542 2966 goto error_remove_from_registry;
7972aab2
DG
2967 }
2968
2969 ret = send_channel_pid_to_ust(app, ua_sess, ua_chan);
2970 if (ret < 0) {
a7169585
MD
2971 if (ret != -ENOTCONN) {
2972 ERR("Error sending channel to application");
2973 }
5b951542 2974 goto error_remove_from_registry;
7972aab2 2975 }
8535a6d9 2976
e9404c27
JG
2977 chan_reg_key = ua_chan->key;
2978 pthread_mutex_lock(&registry->lock);
2979 chan_reg = ust_registry_channel_find(registry, chan_reg_key);
2980 assert(chan_reg);
2981 chan_reg->consumer_key = ua_chan->key;
2982 pthread_mutex_unlock(&registry->lock);
2983
2984 cmd_ret = notification_thread_command_add_channel(
2985 notification_thread_handle, session->name,
2986 ua_sess->euid, ua_sess->egid,
2987 ua_chan->name,
2988 ua_chan->key,
2989 LTTNG_DOMAIN_UST,
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,
e098433c 3239 registry, session->current_archive_id);
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
5b4a0ec0 3379 rcu_read_lock();
852d0037
DG
3380
3381 /*
3382 * On a re-registration, we want to kick out the previous registration of
3383 * that pid
3384 */
d0b96690 3385 lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n);
852d0037
DG
3386
3387 /*
3388 * The socket _should_ be unique until _we_ call close. So, a add_unique
3389 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
3390 * already in the table.
3391 */
d0b96690 3392 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n);
852d0037 3393
d0b96690
DG
3394 /* Add application to the notify socket hash table. */
3395 lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock);
3396 lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n);
5b4a0ec0 3397
d0b96690 3398 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s "
d88aee68
DG
3399 "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid,
3400 app->gid, app->sock, app->name, app->notify_sock, app->v_major,
3401 app->v_minor);
5b4a0ec0 3402
d0b96690
DG
3403 rcu_read_unlock();
3404}
3405
d88aee68
DG
3406/*
3407 * Set the application version into the object.
3408 *
3409 * Return 0 on success else a negative value either an errno code or a
3410 * LTTng-UST error code.
3411 */
d0b96690
DG
3412int ust_app_version(struct ust_app *app)
3413{
d88aee68
DG
3414 int ret;
3415
d0b96690 3416 assert(app);
d88aee68 3417
fb45065e 3418 pthread_mutex_lock(&app->sock_lock);
d88aee68 3419 ret = ustctl_tracer_version(app->sock, &app->version);
fb45065e 3420 pthread_mutex_unlock(&app->sock_lock);
d88aee68
DG
3421 if (ret < 0) {
3422 if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
5368d366 3423 ERR("UST app %d version failed with ret %d", app->sock, ret);
d88aee68 3424 } else {
5368d366 3425 DBG3("UST app %d version failed. Application is dead", app->sock);
d88aee68
DG
3426 }
3427 }
3428
3429 return ret;
5b4a0ec0
DG
3430}
3431
3432/*
3433 * Unregister app by removing it from the global traceable app list and freeing
3434 * the data struct.
3435 *
3436 * The socket is already closed at this point so no close to sock.
3437 */
3438void ust_app_unregister(int sock)
3439{
3440 struct ust_app *lta;
bec39940 3441 struct lttng_ht_node_ulong *node;
c4b88406 3442 struct lttng_ht_iter ust_app_sock_iter;
bec39940 3443 struct lttng_ht_iter iter;
d42f20df 3444 struct ust_app_session *ua_sess;
525b0740 3445 int ret;
5b4a0ec0
DG
3446
3447 rcu_read_lock();
886459c6 3448
5b4a0ec0 3449 /* Get the node reference for a call_rcu */
c4b88406
MD
3450 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter);
3451 node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter);
d0b96690 3452 assert(node);
284d8f55 3453
852d0037 3454 lta = caa_container_of(node, struct ust_app, sock_n);
852d0037
DG
3455 DBG("PID %d unregistering with sock %d", lta->pid, sock);
3456
d88aee68 3457 /*
ce34fcd0
MD
3458 * For per-PID buffers, perform "push metadata" and flush all
3459 * application streams before removing app from hash tables,
3460 * ensuring proper behavior of data_pending check.
c4b88406 3461 * Remove sessions so they are not visible during deletion.
d88aee68 3462 */
d42f20df
DG
3463 cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess,
3464 node.node) {
7972aab2
DG
3465 struct ust_registry_session *registry;
3466
d42f20df
DG
3467 ret = lttng_ht_del(lta->sessions, &iter);
3468 if (ret) {
3469 /* The session was already removed so scheduled for teardown. */
3470 continue;
3471 }
3472
ce34fcd0
MD
3473 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) {
3474 (void) ust_app_flush_app_session(lta, ua_sess);
3475 }
c4b88406 3476
d42f20df
DG
3477 /*
3478 * Add session to list for teardown. This is safe since at this point we
3479 * are the only one using this list.
3480 */
d88aee68
DG
3481 pthread_mutex_lock(&ua_sess->lock);
3482
b161602a
MD
3483 if (ua_sess->deleted) {
3484 pthread_mutex_unlock(&ua_sess->lock);
3485 continue;
3486 }
3487
d88aee68
DG
3488 /*
3489 * Normally, this is done in the delete session process which is
3490 * executed in the call rcu below. However, upon registration we can't
3491 * afford to wait for the grace period before pushing data or else the
3492 * data pending feature can race between the unregistration and stop
3493 * command where the data pending command is sent *before* the grace
3494 * period ended.
3495 *
3496 * The close metadata below nullifies the metadata pointer in the
3497 * session so the delete session will NOT push/close a second time.
3498 */
7972aab2 3499 registry = get_session_registry(ua_sess);
ce34fcd0 3500 if (registry) {
7972aab2
DG
3501 /* Push metadata for application before freeing the application. */
3502 (void) push_metadata(registry, ua_sess->consumer);
3503
3504 /*
3505 * Don't ask to close metadata for global per UID buffers. Close
1b532a60
DG
3506 * metadata only on destroy trace session in this case. Also, the
3507 * previous push metadata could have flag the metadata registry to
3508 * close so don't send a close command if closed.
7972aab2 3509 */
ce34fcd0 3510 if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) {
7972aab2
DG
3511 /* And ask to close it for this session registry. */
3512 (void) close_metadata(registry, ua_sess->consumer);
3513 }
3514 }
d42f20df 3515 cds_list_add(&ua_sess->teardown_node, &lta->teardown_head);
c4b88406 3516
d88aee68 3517 pthread_mutex_unlock(&ua_sess->lock);
d42f20df
DG
3518 }
3519
c4b88406
MD
3520 /* Remove application from PID hash table */
3521 ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter);
3522 assert(!ret);
3523
3524 /*
3525 * Remove application from notify hash table. The thread handling the
3526 * notify socket could have deleted the node so ignore on error because
c48239ca
JG
3527 * either way it's valid. The close of that socket is handled by the
3528 * apps_notify_thread.
c4b88406
MD
3529 */
3530 iter.iter.node = &lta->notify_sock_n.node;
3531 (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
3532
3533 /*
3534 * Ignore return value since the node might have been removed before by an
3535 * add replace during app registration because the PID can be reassigned by
3536 * the OS.
3537 */
3538 iter.iter.node = &lta->pid_n.node;
3539 ret = lttng_ht_del(ust_app_ht, &iter);
3540 if (ret) {
3541 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
3542 lta->pid);
3543 }
3544
852d0037
DG
3545 /* Free memory */
3546 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
3547
5b4a0ec0
DG
3548 rcu_read_unlock();
3549 return;
284d8f55
DG
3550}
3551
5b4a0ec0
DG
3552/*
3553 * Fill events array with all events name of all registered apps.
3554 */
3555int ust_app_list_events(struct lttng_event **events)
421cb601 3556{
5b4a0ec0
DG
3557 int ret, handle;
3558 size_t nbmem, count = 0;
bec39940 3559 struct lttng_ht_iter iter;
5b4a0ec0 3560 struct ust_app *app;
c617c0c6 3561 struct lttng_event *tmp_event;
421cb601 3562
5b4a0ec0 3563 nbmem = UST_APP_EVENT_LIST_SIZE;
c617c0c6
MD
3564 tmp_event = zmalloc(nbmem * sizeof(struct lttng_event));
3565 if (tmp_event == NULL) {
5b4a0ec0
DG
3566 PERROR("zmalloc ust app events");
3567 ret = -ENOMEM;
421cb601
DG
3568 goto error;
3569 }
3570
5b4a0ec0 3571 rcu_read_lock();
421cb601 3572
852d0037 3573 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
90eaa0d2 3574 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 3575
840cb59c 3576 health_code_update();
86acf0da 3577
e0c7ec2b
DG
3578 if (!app->compatible) {
3579 /*
3580 * TODO: In time, we should notice the caller of this error by
3581 * telling him that this is a version error.
3582 */
3583 continue;
3584 }
fb45065e 3585 pthread_mutex_lock(&app->sock_lock);
852d0037 3586 handle = ustctl_tracepoint_list(app->sock);
5b4a0ec0 3587 if (handle < 0) {
ffe60014
DG
3588 if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) {
3589 ERR("UST app list events getting handle failed for app pid %d",
3590 app->pid);
3591 }
fb45065e 3592 pthread_mutex_unlock(&app->sock_lock);
5b4a0ec0
DG
3593 continue;
3594 }
421cb601 3595
852d0037 3596 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
fb54cdbf 3597 &uiter)) != -LTTNG_UST_ERR_NOENT) {
ffe60014
DG
3598 /* Handle ustctl error. */
3599 if (ret < 0) {
fb45065e
MD
3600 int release_ret;
3601
a2ba1ab0 3602 if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
ffe60014
DG
3603 ERR("UST app tp list get failed for app %d with ret %d",
3604 app->sock, ret);
3605 } else {
3606 DBG3("UST app tp list get failed. Application is dead");
3757b385
DG
3607 /*
3608 * This is normal behavior, an application can die during the
3609 * creation process. Don't report an error so the execution can
3610 * continue normally. Continue normal execution.
3611 */
3612 break;
ffe60014 3613 }
98f595d4 3614 free(tmp_event);
fb45065e 3615 release_ret = ustctl_release_handle(app->sock, handle);
68313703
JG
3616 if (release_ret < 0 &&
3617 release_ret != -LTTNG_UST_ERR_EXITING &&
3618 release_ret != -EPIPE) {
fb45065e
MD
3619 ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret);
3620 }
3621 pthread_mutex_unlock(&app->sock_lock);
ffe60014
DG
3622 goto rcu_error;
3623 }
3624
840cb59c 3625 health_code_update();
815564d8 3626 if (count >= nbmem) {
d7b3776f 3627 /* In case the realloc fails, we free the memory */
53efb85a
MD
3628 struct lttng_event *new_tmp_event;
3629 size_t new_nbmem;
3630
3631 new_nbmem = nbmem << 1;
3632 DBG2("Reallocating event list from %zu to %zu entries",
3633 nbmem, new_nbmem);
3634 new_tmp_event = realloc(tmp_event,
3635 new_nbmem * sizeof(struct lttng_event));
3636 if (new_tmp_event == NULL) {
fb45065e
MD
3637 int release_ret;
3638
5b4a0ec0 3639 PERROR("realloc ust app events");
c617c0c6 3640 free(tmp_event);
5b4a0ec0 3641 ret = -ENOMEM;
fb45065e 3642 release_ret = ustctl_release_handle(app->sock, handle);
68313703
JG
3643 if (release_ret < 0 &&
3644 release_ret != -LTTNG_UST_ERR_EXITING &&
3645 release_ret != -EPIPE) {
fb45065e
MD
3646 ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret);
3647 }
3648 pthread_mutex_unlock(&app->sock_lock);
5b4a0ec0
DG
3649 goto rcu_error;
3650 }
53efb85a
MD
3651 /* Zero the new memory */
3652 memset(new_tmp_event + nbmem, 0,
3653 (new_nbmem - nbmem) * sizeof(struct lttng_event));
3654 nbmem = new_nbmem;
3655 tmp_event = new_tmp_event;
5b4a0ec0 3656 }
c617c0c6
MD
3657 memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
3658 tmp_event[count].loglevel = uiter.loglevel;
3659 tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
3660 tmp_event[count].pid = app->pid;
3661 tmp_event[count].enabled = -1;
5b4a0ec0 3662 count++;
421cb601 3663 }
fb45065e
MD
3664 ret = ustctl_release_handle(app->sock, handle);
3665 pthread_mutex_unlock(&app->sock_lock);
68313703 3666 if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
fb45065e
MD
3667 ERR("Error releasing app handle for app %d with ret %d", app->sock, ret);
3668 }
421cb601
DG
3669 }
3670
5b4a0ec0 3671 ret = count;
c617c0c6 3672 *events = tmp_event;
421cb601 3673
5b4a0ec0 3674 DBG2("UST app list events done (%zu events)", count);
421cb601 3675
5b4a0ec0
DG
3676rcu_error:
3677 rcu_read_unlock();
421cb601 3678error:
840cb59c 3679 health_code_update();
5b4a0ec0 3680 return ret;
421cb601
DG
3681}
3682
f37d259d
MD
3683/*
3684 * Fill events array with all events name of all registered apps.
3685 */
3686int ust_app_list_event_fields(struct lttng_event_field **fields)
3687{
3688 int ret, handle;
3689 size_t nbmem, count = 0;
3690 struct lttng_ht_iter iter;
3691 struct ust_app *app;
c617c0c6 3692 struct lttng_event_field *tmp_event;
f37d259d
MD
3693
3694 nbmem = UST_APP_EVENT_LIST_SIZE;
c617c0c6
MD
3695 tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field));
3696 if (tmp_event == NULL) {
f37d259d
MD
3697 PERROR("zmalloc ust app event fields");
3698 ret = -ENOMEM;
3699 goto error;
3700 }
3701
3702 rcu_read_lock();
3703
3704 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
3705 struct lttng_ust_field_iter uiter;
3706
840cb59c 3707 health_code_update();
86acf0da 3708
f37d259d
MD
3709 if (!app->compatible) {
3710 /*
3711 * TODO: In time, we should notice the caller of this error by
3712 * telling him that this is a version error.
3713 */
3714 continue;
3715 }
fb45065e 3716 pthread_mutex_lock(&app->sock_lock);
f37d259d
MD
3717 handle = ustctl_tracepoint_field_list(app->sock);
3718 if (handle < 0) {
ffe60014
DG
3719 if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) {
3720 ERR("UST app list field getting handle failed for app pid %d",
3721 app->pid);
3722 }
fb45065e 3723 pthread_mutex_unlock(&app->sock_lock);
f37d259d
MD
3724 continue;
3725 }
3726
3727 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
fb54cdbf 3728 &uiter)) != -LTTNG_UST_ERR_NOENT) {
ffe60014
DG
3729 /* Handle ustctl error. */
3730 if (ret < 0) {
fb45065e
MD
3731 int release_ret;
3732
a2ba1ab0 3733 if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
ffe60014
DG
3734 ERR("UST app tp list field failed for app %d with ret %d",
3735 app->sock, ret);
3736 } else {
3737 DBG3("UST app tp list field failed. Application is dead");
3757b385
DG
3738 /*
3739 * This is normal behavior, an application can die during the
3740 * creation process. Don't report an error so the execution can
98f595d4 3741 * continue normally. Reset list and count for next app.
3757b385
DG
3742 */
3743 break;
ffe60014 3744 }
98f595d4 3745 free(tmp_event);
fb45065e
MD
3746 release_ret = ustctl_release_handle(app->sock, handle);
3747 pthread_mutex_unlock(&app->sock_lock);
68313703
JG
3748 if (release_ret < 0 &&
3749 release_ret != -LTTNG_UST_ERR_EXITING &&
3750 release_ret != -EPIPE) {
fb45065e
MD
3751 ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret);
3752 }
ffe60014
DG
3753 goto rcu_error;
3754 }
3755
840cb59c 3756 health_code_update();
f37d259d 3757 if (count >= nbmem) {
d7b3776f 3758 /* In case the realloc fails, we free the memory */
53efb85a
MD
3759 struct lttng_event_field *new_tmp_event;
3760 size_t new_nbmem;
3761
3762 new_nbmem = nbmem << 1;
3763 DBG2("Reallocating event field list from %zu to %zu entries",
3764 nbmem, new_nbmem);
3765 new_tmp_event = realloc(tmp_event,
3766 new_nbmem * sizeof(struct lttng_event_field));
3767 if (new_tmp_event == NULL) {
fb45065e
MD
3768 int release_ret;
3769
f37d259d 3770 PERROR("realloc ust app event fields");
c617c0c6 3771 free(tmp_event);
f37d259d 3772 ret = -ENOMEM;
fb45065e
MD
3773 release_ret = ustctl_release_handle(app->sock, handle);
3774 pthread_mutex_unlock(&app->sock_lock);
68313703
JG
3775 if (release_ret &&
3776 release_ret != -LTTNG_UST_ERR_EXITING &&
3777 release_ret != -EPIPE) {
fb45065e
MD
3778 ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret);
3779 }
f37d259d
MD
3780 goto rcu_error;
3781 }
53efb85a
MD
3782 /* Zero the new memory */
3783 memset(new_tmp_event + nbmem, 0,
3784 (new_nbmem - nbmem) * sizeof(struct lttng_event_field));
3785 nbmem = new_nbmem;
3786 tmp_event = new_tmp_event;
f37d259d 3787 }
f37d259d 3788
c617c0c6 3789 memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
2e84128e
DG
3790 /* Mapping between these enums matches 1 to 1. */
3791 tmp_event[count].type = (enum lttng_event_field_type) uiter.type;
c617c0c6 3792 tmp_event[count].nowrite = uiter.nowrite;
f37d259d 3793
c617c0c6
MD
3794 memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
3795 tmp_event[count].event.loglevel = uiter.loglevel;
2e84128e 3796 tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT;
c617c0c6
MD
3797 tmp_event[count].event.pid = app->pid;
3798 tmp_event[count].event.enabled = -1;
f37d259d
MD
3799 count++;
3800 }
fb45065e
MD
3801 ret = ustctl_release_handle(app->sock, handle);
3802 pthread_mutex_unlock(&app->sock_lock);
68313703
JG
3803 if (ret < 0 &&
3804 ret != -LTTNG_UST_ERR_EXITING &&
3805 ret != -EPIPE) {
fb45065e
MD
3806 ERR("Error releasing app handle for app %d with ret %d", app->sock, ret);
3807 }
f37d259d
MD
3808 }
3809
3810 ret = count;
c617c0c6 3811 *fields = tmp_event;
f37d259d
MD
3812
3813 DBG2("UST app list event fields done (%zu events)", count);
3814
3815rcu_error:
3816 rcu_read_unlock();
3817error:
840cb59c 3818 health_code_update();
f37d259d
MD
3819 return ret;
3820}
3821
5b4a0ec0
DG
3822/*
3823 * Free and clean all traceable apps of the global list.
36b588ed
MD
3824 *
3825 * Should _NOT_ be called with RCU read-side lock held.
5b4a0ec0
DG
3826 */
3827void ust_app_clean_list(void)
421cb601 3828{
5b4a0ec0 3829 int ret;
659ed79f 3830 struct ust_app *app;
bec39940 3831 struct lttng_ht_iter iter;
421cb601 3832
5b4a0ec0 3833 DBG2("UST app cleaning registered apps hash table");
421cb601 3834
5b4a0ec0 3835 rcu_read_lock();
421cb601 3836
faadaa3a
JG
3837 /* Cleanup notify socket hash table */
3838 if (ust_app_ht_by_notify_sock) {
3839 cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app,
3840 notify_sock_n.node) {
3841 struct cds_lfht_node *node;
3842 struct ust_app *app;
3843
3844 node = cds_lfht_iter_get_node(&iter.iter);
3845 if (!node) {
3846 continue;
3847 }
3848
3849 app = container_of(node, struct ust_app,
3850 notify_sock_n.node);
3851 ust_app_notify_sock_unregister(app->notify_sock);
3852 }
3853 }
3854
f1b711c4
MD
3855 if (ust_app_ht) {
3856 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
3857 ret = lttng_ht_del(ust_app_ht, &iter);
3858 assert(!ret);
3859 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
3860 }
421cb601
DG
3861 }
3862
852d0037 3863 /* Cleanup socket hash table */
f1b711c4
MD
3864 if (ust_app_ht_by_sock) {
3865 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app,
3866 sock_n.node) {
3867 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
3868 assert(!ret);
3869 }
bec39940 3870 }
852d0037 3871
36b588ed 3872 rcu_read_unlock();
d88aee68 3873
bec39940 3874 /* Destroy is done only when the ht is empty */
f1b711c4
MD
3875 if (ust_app_ht) {
3876 ht_cleanup_push(ust_app_ht);
3877 }
3878 if (ust_app_ht_by_sock) {
3879 ht_cleanup_push(ust_app_ht_by_sock);
3880 }
3881 if (ust_app_ht_by_notify_sock) {
3882 ht_cleanup_push(ust_app_ht_by_notify_sock);
3883 }
5b4a0ec0
DG
3884}
3885
3886/*
3887 * Init UST app hash table.
3888 */
57703f6e 3889int ust_app_ht_alloc(void)
5b4a0ec0 3890{
bec39940 3891 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
57703f6e
MD
3892 if (!ust_app_ht) {
3893 return -1;
3894 }
852d0037 3895 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
57703f6e
MD
3896 if (!ust_app_ht_by_sock) {
3897 return -1;
3898 }
d0b96690 3899 ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
57703f6e
MD
3900 if (!ust_app_ht_by_notify_sock) {
3901 return -1;
3902 }
3903 return 0;
421cb601
DG
3904}
3905
78f0bacd
DG
3906/*
3907 * For a specific UST session, disable the channel for all registered apps.
3908 */
35a9059d 3909int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
3910 struct ltt_ust_channel *uchan)
3911{
3912 int ret = 0;
bec39940
DG
3913 struct lttng_ht_iter iter;
3914 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
3915 struct ust_app *app;
3916 struct ust_app_session *ua_sess;
8535a6d9 3917 struct ust_app_channel *ua_chan;
78f0bacd 3918
88e3c2f5 3919 assert(usess->active);
d9bf3ca4 3920 DBG2("UST app disabling channel %s from global domain for session id %" PRIu64,
a991f516 3921 uchan->name, usess->id);
78f0bacd
DG
3922
3923 rcu_read_lock();
3924
3925 /* For every registered applications */
852d0037 3926 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 3927 struct lttng_ht_iter uiter;
e0c7ec2b
DG
3928 if (!app->compatible) {
3929 /*
3930 * TODO: In time, we should notice the caller of this error by
3931 * telling him that this is a version error.
3932 */
3933 continue;
3934 }
78f0bacd
DG
3935 ua_sess = lookup_session_by_app(usess, app);
3936 if (ua_sess == NULL) {
3937 continue;
3938 }
3939
8535a6d9 3940 /* Get channel */
bec39940
DG
3941 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
3942 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9
DG
3943 /* If the session if found for the app, the channel must be there */
3944 assert(ua_chan_node);
3945
3946 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
3947 /* The channel must not be already disabled */
3948 assert(ua_chan->enabled == 1);
3949
3950 /* Disable channel onto application */
3951 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
3952 if (ret < 0) {
3953 /* XXX: We might want to report this error at some point... */
3954 continue;
3955 }
3956 }
3957
3958 rcu_read_unlock();
78f0bacd
DG
3959 return ret;
3960}
3961
3962/*
3963 * For a specific UST session, enable the channel for all registered apps.
3964 */
35a9059d 3965int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
3966 struct ltt_ust_channel *uchan)
3967{
3968 int ret = 0;
bec39940 3969 struct lttng_ht_iter iter;
78f0bacd
DG
3970 struct ust_app *app;
3971 struct ust_app_session *ua_sess;
3972
88e3c2f5 3973 assert(usess->active);
d9bf3ca4 3974 DBG2("UST app enabling channel %s to global domain for session id %" PRIu64,
a991f516 3975 uchan->name, usess->id);
78f0bacd
DG
3976
3977 rcu_read_lock();
3978
3979 /* For every registered applications */
852d0037 3980 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
3981 if (!app->compatible) {
3982 /*
3983 * TODO: In time, we should notice the caller of this error by
3984 * telling him that this is a version error.
3985 */
3986 continue;
3987 }
78f0bacd
DG
3988 ua_sess = lookup_session_by_app(usess, app);
3989 if (ua_sess == NULL) {
3990 continue;
3991 }
3992
3993 /* Enable channel onto application */
3994 ret = enable_ust_app_channel(ua_sess, uchan, app);
3995 if (ret < 0) {
3996 /* XXX: We might want to report this error at some point... */
3997 continue;
3998 }
3999 }
4000
4001 rcu_read_unlock();
78f0bacd
DG
4002 return ret;
4003}
4004
b0a40d28
DG
4005/*
4006 * Disable an event in a channel and for a specific session.
4007 */
35a9059d
DG
4008int ust_app_disable_event_glb(struct ltt_ust_session *usess,
4009 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
b0a40d28
DG
4010{
4011 int ret = 0;
bec39940 4012 struct lttng_ht_iter iter, uiter;
700c5a9d 4013 struct lttng_ht_node_str *ua_chan_node;
b0a40d28
DG
4014 struct ust_app *app;
4015 struct ust_app_session *ua_sess;
4016 struct ust_app_channel *ua_chan;
4017 struct ust_app_event *ua_event;
4018
88e3c2f5 4019 assert(usess->active);
b0a40d28 4020 DBG("UST app disabling event %s for all apps in channel "
d9bf3ca4
MD
4021 "%s for session id %" PRIu64,
4022 uevent->attr.name, uchan->name, usess->id);
b0a40d28
DG
4023
4024 rcu_read_lock();
4025
4026 /* For all registered applications */
852d0037 4027 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
4028 if (!app->compatible) {
4029 /*
4030 * TODO: In time, we should notice the caller of this error by
4031 * telling him that this is a version error.
4032 */
4033 continue;
4034 }
b0a40d28
DG
4035 ua_sess = lookup_session_by_app(usess, app);
4036 if (ua_sess == NULL) {
4037 /* Next app */
4038 continue;
4039 }
4040
4041 /* Lookup channel in the ust app session */
bec39940
DG
4042 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
4043 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28 4044 if (ua_chan_node == NULL) {
d9bf3ca4 4045 DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d."
852d0037 4046 "Skipping", uchan->name, usess->id, app->pid);
b0a40d28
DG
4047 continue;
4048 }
4049 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
4050
700c5a9d
JR
4051 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
4052 uevent->filter, uevent->attr.loglevel,
4053 uevent->exclusion);
4054 if (ua_event == NULL) {
b0a40d28 4055 DBG2("Event %s not found in channel %s for app pid %d."
852d0037 4056 "Skipping", uevent->attr.name, uchan->name, app->pid);
b0a40d28
DG
4057 continue;
4058 }
b0a40d28 4059
7f79d3a1 4060 ret = disable_ust_app_event(ua_sess, ua_event, app);
b0a40d28
DG
4061 if (ret < 0) {
4062 /* XXX: Report error someday... */
4063 continue;
4064 }
4065 }
4066
4067 rcu_read_unlock();
88e3c2f5
JG
4068 return ret;
4069}
4070
4071/* The ua_sess lock must be held by the caller. */
4072static
4073int ust_app_channel_create(struct ltt_ust_session *usess,
4074 struct ust_app_session *ua_sess,
4075 struct ltt_ust_channel *uchan, struct ust_app *app,
4076 struct ust_app_channel **_ua_chan)
4077{
4078 int ret = 0;
4079 struct ust_app_channel *ua_chan = NULL;
4080
4081 assert(ua_sess);
4082 ASSERT_LOCKED(ua_sess->lock);
4083
4084 if (!strncmp(uchan->name, DEFAULT_METADATA_NAME,
4085 sizeof(uchan->name))) {
4086 copy_channel_attr_to_ustctl(&ua_sess->metadata_attr,
4087 &uchan->attr);
4088 ret = 0;
4089 } else {
4090 struct ltt_ust_context *uctx = NULL;
4091
4092 /*
4093 * Create channel onto application and synchronize its
4094 * configuration.
4095 */
4096 ret = ust_app_channel_allocate(ua_sess, uchan,
4097 LTTNG_UST_CHAN_PER_CPU, usess,
4098 &ua_chan);
4099 if (ret == 0) {
4100 ret = ust_app_channel_send(app, usess,
4101 ua_sess, ua_chan);
4102 } else {
4103 goto end;
4104 }
4105
4106 /* Add contexts. */
4107 cds_list_for_each_entry(uctx, &uchan->ctx_list, list) {
4108 ret = create_ust_app_channel_context(ua_chan,
4109 &uctx->ctx, app);
4110 if (ret) {
4111 goto end;
4112 }
4113 }
4114 }
4115 if (ret < 0) {
4116 switch (ret) {
4117 case -ENOTCONN:
4118 /*
4119 * The application's socket is not valid. Either a bad socket
4120 * or a timeout on it. We can't inform the caller that for a
4121 * specific app, the session failed so lets continue here.
4122 */
4123 ret = 0; /* Not an error. */
4124 break;
4125 case -ENOMEM:
4126 default:
4127 break;
4128 }
4129 }
0498a00c 4130end:
88e3c2f5
JG
4131 if (ret == 0 && _ua_chan) {
4132 /*
4133 * Only return the application's channel on success. Note
4134 * that the channel can still be part of the application's
4135 * channel hashtable on error.
4136 */
4137 *_ua_chan = ua_chan;
4138 }
b0a40d28
DG
4139 return ret;
4140}
4141
421cb601 4142/*
5b4a0ec0 4143 * For a specific UST session, create the channel for all registered apps.
421cb601 4144 */
35a9059d 4145int ust_app_create_channel_glb(struct ltt_ust_session *usess,
48842b30
DG
4146 struct ltt_ust_channel *uchan)
4147{
88e3c2f5
JG
4148 int ret = 0;
4149 struct cds_lfht_iter iter;
48842b30 4150 struct ust_app *app;
48842b30 4151
fc34caaa 4152 assert(usess);
88e3c2f5 4153 assert(usess->active);
fc34caaa 4154 assert(uchan);
421cb601 4155
d9bf3ca4 4156 DBG2("UST app adding channel %s to UST domain for session id %" PRIu64,
a991f516 4157 uchan->name, usess->id);
48842b30
DG
4158
4159 rcu_read_lock();
5b4a0ec0 4160 /* For every registered applications */
88e3c2f5
JG
4161 cds_lfht_for_each_entry(ust_app_ht->ht, &iter, app, pid_n.node) {
4162 struct ust_app_session *ua_sess;
4163 int session_was_created = 0;
4164
4165 if (!app->compatible ||
4166 !trace_ust_pid_tracker_lookup(usess, app->pid)) {
4167 goto error_rcu_unlock;
a9ad0c8f
MD
4168 }
4169
edb67388
DG
4170 /*
4171 * Create session on the tracer side and add it to app session HT. Note
4172 * that if session exist, it will simply return a pointer to the ust
4173 * app session.
4174 */
88e3c2f5
JG
4175 ret = find_or_create_ust_app_session(usess, app, &ua_sess,
4176 &session_was_created);
3d8ca23b
DG
4177 if (ret < 0) {
4178 switch (ret) {
4179 case -ENOTCONN:
4180 /*
88e3c2f5
JG
4181 * The application's socket is not valid. Either a bad
4182 * socket or a timeout on it. We can't inform the caller
4183 * that for a specific app, the session failed so lets
4184 * continue here; it is not an error.
3d8ca23b 4185 */
88e3c2f5
JG
4186 ret = 0;
4187 goto error_rcu_unlock;
3d8ca23b
DG
4188 case -ENOMEM:
4189 default:
4190 goto error_rcu_unlock;
4191 }
48842b30 4192 }
b161602a
MD
4193
4194 if (ua_sess->deleted) {
b161602a
MD
4195 continue;
4196 }
88e3c2f5
JG
4197 ret = ust_app_channel_create(usess, ua_sess, uchan, app, NULL);
4198 if (ret) {
4199 if (session_was_created) {
d0b96690 4200 destroy_app_session(app, ua_sess);
3d8ca23b 4201 }
88e3c2f5 4202 goto error_rcu_unlock;
48842b30 4203 }
48842b30 4204 }
5b4a0ec0 4205
95e047ff 4206error_rcu_unlock:
48842b30 4207 rcu_read_unlock();
3c14c33f 4208 return ret;
48842b30
DG
4209}
4210
5b4a0ec0 4211/*
edb67388 4212 * Enable event for a specific session and channel on the tracer.
5b4a0ec0 4213 */
35a9059d 4214int ust_app_enable_event_glb(struct ltt_ust_session *usess,
48842b30
DG
4215 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
4216{
4217 int ret = 0;
bec39940 4218 struct lttng_ht_iter iter, uiter;
18eace3b 4219 struct lttng_ht_node_str *ua_chan_node;
48842b30
DG
4220 struct ust_app *app;
4221 struct ust_app_session *ua_sess;
4222 struct ust_app_channel *ua_chan;
4223 struct ust_app_event *ua_event;
48842b30 4224
88e3c2f5 4225 assert(usess->active);
d9bf3ca4 4226 DBG("UST app enabling event %s for all apps for session id %" PRIu64,
a991f516 4227 uevent->attr.name, usess->id);
48842b30 4228
edb67388
DG
4229 /*
4230 * NOTE: At this point, this function is called only if the session and
4231 * channel passed are already created for all apps. and enabled on the
4232 * tracer also.
4233 */
4234
48842b30 4235 rcu_read_lock();
421cb601
DG
4236
4237 /* For all registered applications */
852d0037 4238 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
4239 if (!app->compatible) {
4240 /*
4241 * TODO: In time, we should notice the caller of this error by
4242 * telling him that this is a version error.
4243 */
4244 continue;
4245 }
edb67388 4246 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
4247 if (!ua_sess) {
4248 /* The application has problem or is probably dead. */
4249 continue;
4250 }
ba767faf 4251
d0b96690
DG
4252 pthread_mutex_lock(&ua_sess->lock);
4253
b161602a
MD
4254 if (ua_sess->deleted) {
4255 pthread_mutex_unlock(&ua_sess->lock);
4256 continue;
4257 }
4258
edb67388 4259 /* Lookup channel in the ust app session */
bec39940
DG
4260 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
4261 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
a7169585
MD
4262 /*
4263 * It is possible that the channel cannot be found is
4264 * the channel/event creation occurs concurrently with
4265 * an application exit.
4266 */
4267 if (!ua_chan_node) {
4268 pthread_mutex_unlock(&ua_sess->lock);
4269 continue;
4270 }
edb67388
DG
4271
4272 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
4273
18eace3b
DG
4274 /* Get event node */
4275 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
39c5a3a7 4276 uevent->filter, uevent->attr.loglevel, uevent->exclusion);
18eace3b 4277 if (ua_event == NULL) {
7f79d3a1 4278 DBG3("UST app enable event %s not found for app PID %d."
852d0037 4279 "Skipping app", uevent->attr.name, app->pid);
d0b96690 4280 goto next_app;
35a9059d 4281 }
35a9059d
DG
4282
4283 ret = enable_ust_app_event(ua_sess, ua_event, app);
4284 if (ret < 0) {
d0b96690 4285 pthread_mutex_unlock(&ua_sess->lock);
7f79d3a1 4286 goto error;
48842b30 4287 }
d0b96690
DG
4288 next_app:
4289 pthread_mutex_unlock(&ua_sess->lock);
edb67388
DG
4290 }
4291
7f79d3a1 4292error:
edb67388 4293 rcu_read_unlock();
edb67388
DG
4294 return ret;
4295}
4296
4297/*
4298 * For a specific existing UST session and UST channel, creates the event for
4299 * all registered apps.
4300 */
35a9059d 4301int ust_app_create_event_glb(struct ltt_ust_session *usess,
edb67388
DG
4302 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
4303{
4304 int ret = 0;
bec39940
DG
4305 struct lttng_ht_iter iter, uiter;
4306 struct lttng_ht_node_str *ua_chan_node;
edb67388
DG
4307 struct ust_app *app;
4308 struct ust_app_session *ua_sess;
4309 struct ust_app_channel *ua_chan;
4310
88e3c2f5 4311 assert(usess->active);
d9bf3ca4 4312 DBG("UST app creating event %s for all apps for session id %" PRIu64,
a991f516 4313 uevent->attr.name, usess->id);
edb67388 4314
edb67388
DG
4315 rcu_read_lock();
4316
4317 /* For all registered applications */
852d0037 4318 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
4319 if (!app->compatible) {
4320 /*
4321 * TODO: In time, we should notice the caller of this error by
4322 * telling him that this is a version error.
4323 */
4324 continue;
4325 }
edb67388 4326 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
4327 if (!ua_sess) {
4328 /* The application has problem or is probably dead. */
4329 continue;
4330 }
48842b30 4331
d0b96690 4332 pthread_mutex_lock(&ua_sess->lock);
b161602a
MD
4333
4334 if (ua_sess->deleted) {
4335 pthread_mutex_unlock(&ua_sess->lock);
4336 continue;
4337 }
4338
48842b30 4339 /* Lookup channel in the ust app session */
bec39940
DG
4340 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
4341 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
4342 /* If the channel is not found, there is a code flow error */
4343 assert(ua_chan_node);
4344
48842b30
DG
4345 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
4346
edb67388 4347 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
d0b96690 4348 pthread_mutex_unlock(&ua_sess->lock);
edb67388 4349 if (ret < 0) {
49c336c1 4350 if (ret != -LTTNG_UST_ERR_EXIST) {
fc34caaa
DG
4351 /* Possible value at this point: -ENOMEM. If so, we stop! */
4352 break;
4353 }
4354 DBG2("UST app event %s already exist on app PID %d",
852d0037 4355 uevent->attr.name, app->pid);
5b4a0ec0 4356 continue;
48842b30 4357 }
48842b30 4358 }
5b4a0ec0 4359
48842b30 4360 rcu_read_unlock();
48842b30
DG
4361 return ret;
4362}
4363
5b4a0ec0
DG
4364/*
4365 * Start tracing for a specific UST session and app.
fad1ed2f
JR
4366 *
4367 * Called with UST app session lock held.
4368 *
5b4a0ec0 4369 */
b34cbebf 4370static
421cb601 4371int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
48842b30
DG
4372{
4373 int ret = 0;
48842b30 4374 struct ust_app_session *ua_sess;
48842b30 4375
852d0037 4376 DBG("Starting tracing for ust app pid %d", app->pid);
5cf5d0e7 4377
509cbaf8
MD
4378 rcu_read_lock();
4379
e0c7ec2b
DG
4380 if (!app->compatible) {
4381 goto end;
4382 }
4383
421cb601
DG
4384 ua_sess = lookup_session_by_app(usess, app);
4385 if (ua_sess == NULL) {
d42f20df
DG
4386 /* The session is in teardown process. Ignore and continue. */
4387 goto end;
421cb601 4388 }
48842b30 4389
d0b96690
DG
4390 pthread_mutex_lock(&ua_sess->lock);
4391
b161602a
MD
4392 if (ua_sess->deleted) {
4393 pthread_mutex_unlock(&ua_sess->lock);
4394 goto end;
4395 }
4396
aea829b3
DG
4397 /* Upon restart, we skip the setup, already done */
4398 if (ua_sess->started) {
8be98f9a 4399 goto skip_setup;
aea829b3 4400 }
8be98f9a 4401
a4b92340
DG
4402 /* Create directories if consumer is LOCAL and has a path defined. */
4403 if (usess->consumer->type == CONSUMER_DST_LOCAL &&
366a9222
JD
4404 usess->consumer->dst.session_root_path[0] != '\0') {
4405 char *tmp_path;
4406
61ba6b6d 4407 tmp_path = zmalloc(LTTNG_PATH_MAX);
366a9222
JD
4408 if (!tmp_path) {
4409 ERR("Alloc tmp_path");
4410 goto error_unlock;
4411 }
61ba6b6d 4412 ret = snprintf(tmp_path, LTTNG_PATH_MAX, "%s%s%s",
366a9222
JD
4413 usess->consumer->dst.session_root_path,
4414 usess->consumer->chunk_path,
4415 usess->consumer->subdir);
61ba6b6d 4416 if (ret >= LTTNG_PATH_MAX) {
366a9222 4417 ERR("Local destination path exceeds the maximal allowed length of %i bytes (needs %i bytes) with path = \"%s%s%s\"",
61ba6b6d 4418 LTTNG_PATH_MAX, ret,
366a9222
JD
4419 usess->consumer->dst.session_root_path,
4420 usess->consumer->chunk_path,
4421 usess->consumer->subdir);
a0fda194 4422 free(tmp_path);
366a9222
JD
4423 goto error_unlock;
4424 }
4425
4426 DBG("Creating directory path for local tracing: \"%s\"",
4427 tmp_path);
4428 ret = run_as_mkdir_recursive(tmp_path, S_IRWXU | S_IRWXG,
4429 ua_sess->euid, ua_sess->egid);
4430 free(tmp_path);
a4b92340 4431 if (ret < 0) {
df5b86c8 4432 if (errno != EEXIST) {
a4b92340 4433 ERR("Trace directory creation error");
d0b96690 4434 goto error_unlock;
421cb601 4435 }
173af62f 4436 }
7753dea8 4437 }
aea829b3 4438
d65d2de8
DG
4439 /*
4440 * Create the metadata for the application. This returns gracefully if a
4441 * metadata was already set for the session.
4442 */
ad7a9107 4443 ret = create_ust_app_metadata(ua_sess, app, usess->consumer);
421cb601 4444 if (ret < 0) {
d0b96690 4445 goto error_unlock;
421cb601 4446 }
48842b30 4447
840cb59c 4448 health_code_update();
86acf0da 4449
8be98f9a 4450skip_setup:
421cb601 4451 /* This start the UST tracing */
fb45065e 4452 pthread_mutex_lock(&app->sock_lock);
852d0037 4453 ret = ustctl_start_session(app->sock, ua_sess->handle);
fb45065e 4454 pthread_mutex_unlock(&app->sock_lock);
421cb601 4455 if (ret < 0) {
ffe60014
DG
4456 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4457 ERR("Error starting tracing for app pid: %d (ret: %d)",
4458 app->pid, ret);
4459 } else {
4460 DBG("UST app start session failed. Application is dead.");
3757b385
DG
4461 /*
4462 * This is normal behavior, an application can die during the
4463 * creation process. Don't report an error so the execution can
4464 * continue normally.
4465 */
4466 pthread_mutex_unlock(&ua_sess->lock);
4467 goto end;
ffe60014 4468 }
d0b96690 4469 goto error_unlock;
421cb601 4470 }
5b4a0ec0 4471
55c3953d
DG
4472 /* Indicate that the session has been started once */
4473 ua_sess->started = 1;
4474
d0b96690
DG
4475 pthread_mutex_unlock(&ua_sess->lock);
4476
840cb59c 4477 health_code_update();
86acf0da 4478
421cb601 4479 /* Quiescent wait after starting trace */
fb45065e 4480 pthread_mutex_lock(&app->sock_lock);
ffe60014 4481 ret = ustctl_wait_quiescent(app->sock);
fb45065e 4482 pthread_mutex_unlock(&app->sock_lock);
ffe60014
DG
4483 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4484 ERR("UST app wait quiescent failed for app pid %d ret %d",
4485 app->pid, ret);
4486 }
48842b30 4487
e0c7ec2b
DG
4488end:
4489 rcu_read_unlock();
840cb59c 4490 health_code_update();
421cb601 4491 return 0;
48842b30 4492
d0b96690
DG
4493error_unlock:
4494 pthread_mutex_unlock(&ua_sess->lock);
509cbaf8 4495 rcu_read_unlock();
840cb59c 4496 health_code_update();
421cb601
DG
4497 return -1;
4498}
48842b30 4499
8be98f9a
MD
4500/*
4501 * Stop tracing for a specific UST session and app.
4502 */
b34cbebf 4503static
8be98f9a
MD
4504int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
4505{
4506 int ret = 0;
4507 struct ust_app_session *ua_sess;
7972aab2 4508 struct ust_registry_session *registry;
8be98f9a 4509
852d0037 4510 DBG("Stopping tracing for ust app pid %d", app->pid);
8be98f9a
MD
4511
4512 rcu_read_lock();
4513
e0c7ec2b 4514 if (!app->compatible) {
d88aee68 4515 goto end_no_session;
e0c7ec2b
DG
4516 }
4517
8be98f9a
MD
4518 ua_sess = lookup_session_by_app(usess, app);
4519 if (ua_sess == NULL) {
d88aee68 4520 goto end_no_session;
8be98f9a
MD
4521 }
4522
d88aee68
DG
4523 pthread_mutex_lock(&ua_sess->lock);
4524
b161602a
MD
4525 if (ua_sess->deleted) {
4526 pthread_mutex_unlock(&ua_sess->lock);
4527 goto end_no_session;
4528 }
4529
9bc07046
DG
4530 /*
4531 * If started = 0, it means that stop trace has been called for a session
c45536e1
DG
4532 * that was never started. It's possible since we can have a fail start
4533 * from either the application manager thread or the command thread. Simply
4534 * indicate that this is a stop error.
9bc07046 4535 */
f9dfc3d9 4536 if (!ua_sess->started) {
c45536e1
DG
4537 goto error_rcu_unlock;
4538 }
7db205b5 4539
840cb59c 4540 health_code_update();
86acf0da 4541
9d6c7d3f 4542 /* This inhibits UST tracing */
fb45065e 4543 pthread_mutex_lock(&app->sock_lock);
852d0037 4544 ret = ustctl_stop_session(app->sock, ua_sess->handle);
fb45065e 4545 pthread_mutex_unlock(&app->sock_lock);
9d6c7d3f 4546 if (ret < 0) {
ffe60014
DG
4547 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4548 ERR("Error stopping tracing for app pid: %d (ret: %d)",
4549 app->pid, ret);
4550 } else {
4551 DBG("UST app stop session failed. Application is dead.");
3757b385
DG
4552 /*
4553 * This is normal behavior, an application can die during the
4554 * creation process. Don't report an error so the execution can
4555 * continue normally.
4556 */
4557 goto end_unlock;
ffe60014 4558 }
9d6c7d3f
DG
4559 goto error_rcu_unlock;
4560 }
4561
840cb59c 4562 health_code_update();
86acf0da 4563
9d6c7d3f 4564 /* Quiescent wait after stopping trace */
fb45065e 4565 pthread_mutex_lock(&app->sock_lock);
ffe60014 4566 ret = ustctl_wait_quiescent(app->sock);
fb45065e 4567 pthread_mutex_unlock(&app->sock_lock);
ffe60014
DG
4568 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4569 ERR("UST app wait quiescent failed for app pid %d ret %d",
4570 app->pid, ret);
4571 }
9d6c7d3f 4572
840cb59c 4573 health_code_update();
86acf0da 4574
b34cbebf 4575 registry = get_session_registry(ua_sess);
fad1ed2f
JR
4576
4577 /* The UST app session is held registry shall not be null. */
b34cbebf 4578 assert(registry);
1b532a60 4579
ce34fcd0
MD
4580 /* Push metadata for application before freeing the application. */
4581 (void) push_metadata(registry, ua_sess->consumer);
b34cbebf 4582
3757b385 4583end_unlock:
b34cbebf
MD
4584 pthread_mutex_unlock(&ua_sess->lock);
4585end_no_session:
4586 rcu_read_unlock();
4587 health_code_update();
4588 return 0;
4589
4590error_rcu_unlock:
4591 pthread_mutex_unlock(&ua_sess->lock);
4592 rcu_read_unlock();
4593 health_code_update();
4594 return -1;
4595}
4596
b34cbebf 4597static
c4b88406
MD
4598int ust_app_flush_app_session(struct ust_app *app,
4599 struct ust_app_session *ua_sess)
b34cbebf 4600{
c4b88406 4601 int ret, retval = 0;
b34cbebf 4602 struct lttng_ht_iter iter;
b34cbebf 4603 struct ust_app_channel *ua_chan;
c4b88406 4604 struct consumer_socket *socket;
b34cbebf 4605
c4b88406 4606 DBG("Flushing app session buffers for ust app pid %d", app->pid);
b34cbebf
MD
4607
4608 rcu_read_lock();
4609
4610 if (!app->compatible) {
c4b88406 4611 goto end_not_compatible;
b34cbebf
MD
4612 }
4613
4614 pthread_mutex_lock(&ua_sess->lock);
4615
b161602a
MD
4616 if (ua_sess->deleted) {
4617 goto end_deleted;
4618 }
4619
b34cbebf
MD
4620 health_code_update();
4621
9d6c7d3f 4622 /* Flushing buffers */
c4b88406
MD
4623 socket = consumer_find_socket_by_bitness(app->bits_per_long,
4624 ua_sess->consumer);
ce34fcd0
MD
4625
4626 /* Flush buffers and push metadata. */
4627 switch (ua_sess->buffer_type) {
4628 case LTTNG_BUFFER_PER_PID:
4629 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
4630 node.node) {
4631 health_code_update();
ce34fcd0
MD
4632 ret = consumer_flush_channel(socket, ua_chan->key);
4633 if (ret) {
4634 ERR("Error flushing consumer channel");
4635 retval = -1;
4636 continue;
4637 }
8be98f9a 4638 }
ce34fcd0
MD
4639 break;
4640 case LTTNG_BUFFER_PER_UID:
4641 default:
4642 assert(0);
4643 break;
8be98f9a 4644 }
8be98f9a 4645
840cb59c 4646 health_code_update();
86acf0da 4647
b161602a 4648end_deleted:
d88aee68 4649 pthread_mutex_unlock(&ua_sess->lock);
ce34fcd0 4650
c4b88406
MD
4651end_not_compatible:
4652 rcu_read_unlock();
4653 health_code_update();
4654 return retval;
4655}
4656
4657/*
ce34fcd0
MD
4658 * Flush buffers for all applications for a specific UST session.
4659 * Called with UST session lock held.
c4b88406
MD
4660 */
4661static
ce34fcd0 4662int ust_app_flush_session(struct ltt_ust_session *usess)
c4b88406
MD
4663
4664{
99b1411c 4665 int ret = 0;
c4b88406 4666
ce34fcd0 4667 DBG("Flushing session buffers for all ust apps");
c4b88406
MD
4668
4669 rcu_read_lock();
4670
ce34fcd0
MD
4671 /* Flush buffers and push metadata. */
4672 switch (usess->buffer_type) {
4673 case LTTNG_BUFFER_PER_UID:
4674 {
4675 struct buffer_reg_uid *reg;
4676 struct lttng_ht_iter iter;
4677
4678 /* Flush all per UID buffers associated to that session. */
4679 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
4680 struct ust_registry_session *ust_session_reg;
4681 struct buffer_reg_channel *reg_chan;
4682 struct consumer_socket *socket;
4683
4684 /* Get consumer socket to use to push the metadata.*/
4685 socket = consumer_find_socket_by_bitness(reg->bits_per_long,
4686 usess->consumer);
4687 if (!socket) {
4688 /* Ignore request if no consumer is found for the session. */
4689 continue;
4690 }
4691
4692 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
4693 reg_chan, node.node) {
4694 /*
4695 * The following call will print error values so the return
4696 * code is of little importance because whatever happens, we
4697 * have to try them all.
4698 */
4699 (void) consumer_flush_channel(socket, reg_chan->consumer_key);
4700 }
4701
4702 ust_session_reg = reg->registry->reg.ust;
4703 /* Push metadata. */
4704 (void) push_metadata(ust_session_reg, usess->consumer);
4705 }
ce34fcd0
MD
4706 break;
4707 }
4708 case LTTNG_BUFFER_PER_PID:
4709 {
4710 struct ust_app_session *ua_sess;
4711 struct lttng_ht_iter iter;
4712 struct ust_app *app;
4713
4714 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4715 ua_sess = lookup_session_by_app(usess, app);
4716 if (ua_sess == NULL) {
4717 continue;
4718 }
4719 (void) ust_app_flush_app_session(app, ua_sess);
4720 }
4721 break;
4722 }
4723 default:
99b1411c 4724 ret = -1;
ce34fcd0
MD
4725 assert(0);
4726 break;
c4b88406 4727 }
c4b88406 4728
7db205b5 4729 rcu_read_unlock();
840cb59c 4730 health_code_update();
c4b88406 4731 return ret;
8be98f9a
MD
4732}
4733
0dd01979
MD
4734static
4735int ust_app_clear_quiescent_app_session(struct ust_app *app,
4736 struct ust_app_session *ua_sess)
4737{
4738 int ret = 0;
4739 struct lttng_ht_iter iter;
4740 struct ust_app_channel *ua_chan;
4741 struct consumer_socket *socket;
4742
4743 DBG("Clearing stream quiescent state for ust app pid %d", app->pid);
4744
4745 rcu_read_lock();
4746
4747 if (!app->compatible) {
4748 goto end_not_compatible;
4749 }
4750
4751 pthread_mutex_lock(&ua_sess->lock);
4752
4753 if (ua_sess->deleted) {
4754 goto end_unlock;
4755 }
4756
4757 health_code_update();
4758
4759 socket = consumer_find_socket_by_bitness(app->bits_per_long,
4760 ua_sess->consumer);
4761 if (!socket) {
4762 ERR("Failed to find consumer (%" PRIu32 ") socket",
4763 app->bits_per_long);
4764 ret = -1;
4765 goto end_unlock;
4766 }
4767
4768 /* Clear quiescent state. */
4769 switch (ua_sess->buffer_type) {
4770 case LTTNG_BUFFER_PER_PID:
4771 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter,
4772 ua_chan, node.node) {
4773 health_code_update();
4774 ret = consumer_clear_quiescent_channel(socket,
4775 ua_chan->key);
4776 if (ret) {
4777 ERR("Error clearing quiescent state for consumer channel");
4778 ret = -1;
4779 continue;
4780 }
4781 }
4782 break;
4783 case LTTNG_BUFFER_PER_UID:
4784 default:
4785 assert(0);
4786 ret = -1;
4787 break;
4788 }
4789
4790 health_code_update();
4791
4792end_unlock:
4793 pthread_mutex_unlock(&ua_sess->lock);
4794
4795end_not_compatible:
4796 rcu_read_unlock();
4797 health_code_update();
4798 return ret;
4799}
4800
4801/*
4802 * Clear quiescent state in each stream for all applications for a
4803 * specific UST session.
4804 * Called with UST session lock held.
4805 */
4806static
4807int ust_app_clear_quiescent_session(struct ltt_ust_session *usess)
4808
4809{
4810 int ret = 0;
4811
4812 DBG("Clearing stream quiescent state for all ust apps");
4813
4814 rcu_read_lock();
4815
4816 switch (usess->buffer_type) {
4817 case LTTNG_BUFFER_PER_UID:
4818 {
4819 struct lttng_ht_iter iter;
4820 struct buffer_reg_uid *reg;
4821
4822 /*
4823 * Clear quiescent for all per UID buffers associated to
4824 * that session.
4825 */
4826 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
4827 struct consumer_socket *socket;
4828 struct buffer_reg_channel *reg_chan;
4829
4830 /* Get associated consumer socket.*/
4831 socket = consumer_find_socket_by_bitness(
4832 reg->bits_per_long, usess->consumer);
4833 if (!socket) {
4834 /*
4835 * Ignore request if no consumer is found for
4836 * the session.
4837 */
4838 continue;
4839 }
4840
4841 cds_lfht_for_each_entry(reg->registry->channels->ht,
4842 &iter.iter, reg_chan, node.node) {
4843 /*
4844 * The following call will print error values so
4845 * the return code is of little importance
4846 * because whatever happens, we have to try them
4847 * all.
4848 */
4849 (void) consumer_clear_quiescent_channel(socket,
4850 reg_chan->consumer_key);
4851 }
4852 }
4853 break;
4854 }
4855 case LTTNG_BUFFER_PER_PID:
4856 {
4857 struct ust_app_session *ua_sess;
4858 struct lttng_ht_iter iter;
4859 struct ust_app *app;
4860
4861 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app,
4862 pid_n.node) {
4863 ua_sess = lookup_session_by_app(usess, app);
4864 if (ua_sess == NULL) {
4865 continue;
4866 }
4867 (void) ust_app_clear_quiescent_app_session(app,
4868 ua_sess);
4869 }
4870 break;
4871 }
4872 default:
4873 ret = -1;
4874 assert(0);
4875 break;
4876 }
4877
4878 rcu_read_unlock();
4879 health_code_update();
4880 return ret;
4881}
4882
84cd17c6
MD
4883/*
4884 * Destroy a specific UST session in apps.
4885 */
3353de95 4886static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
84cd17c6 4887{
ffe60014 4888 int ret;
84cd17c6 4889 struct ust_app_session *ua_sess;
bec39940 4890 struct lttng_ht_iter iter;
d9bf3ca4 4891 struct lttng_ht_node_u64 *node;
84cd17c6 4892
852d0037 4893 DBG("Destroy tracing for ust app pid %d", app->pid);
84cd17c6
MD
4894
4895 rcu_read_lock();
4896
e0c7ec2b
DG
4897 if (!app->compatible) {
4898 goto end;
4899 }
4900
84cd17c6 4901 __lookup_session_by_app(usess, app, &iter);
d9bf3ca4 4902 node = lttng_ht_iter_get_node_u64(&iter);
84cd17c6 4903 if (node == NULL) {
d42f20df
DG
4904 /* Session is being or is deleted. */
4905 goto end;
84cd17c6
MD
4906 }
4907 ua_sess = caa_container_of(node, struct ust_app_session, node);
c4a1715b 4908
840cb59c 4909 health_code_update();
d0b96690 4910 destroy_app_session(app, ua_sess);
84cd17c6 4911
840cb59c 4912 health_code_update();
7db205b5 4913
84cd17c6 4914 /* Quiescent wait after stopping trace */
fb45065e 4915 pthread_mutex_lock(&app->sock_lock);
ffe60014 4916 ret = ustctl_wait_quiescent(app->sock);
fb45065e 4917 pthread_mutex_unlock(&app->sock_lock);
ffe60014
DG
4918 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
4919 ERR("UST app wait quiescent failed for app pid %d ret %d",
4920 app->pid, ret);
4921 }
e0c7ec2b
DG
4922end:
4923 rcu_read_unlock();
840cb59c 4924 health_code_update();
84cd17c6 4925 return 0;
84cd17c6
MD
4926}
4927
5b4a0ec0
DG
4928/*
4929 * Start tracing for the UST session.
4930 */
421cb601
DG
4931int ust_app_start_trace_all(struct ltt_ust_session *usess)
4932{
bec39940 4933 struct lttng_ht_iter iter;
421cb601 4934 struct ust_app *app;
48842b30 4935
421cb601
DG
4936 DBG("Starting all UST traces");
4937
bb2452c8
MD
4938 /*
4939 * Even though the start trace might fail, flag this session active so
4940 * other application coming in are started by default.
4941 */
4942 usess->active = 1;
4943
421cb601 4944 rcu_read_lock();
421cb601 4945
0dd01979
MD
4946 /*
4947 * In a start-stop-start use-case, we need to clear the quiescent state
4948 * of each channel set by the prior stop command, thus ensuring that a
4949 * following stop or destroy is sure to grab a timestamp_end near those
4950 * operations, even if the packet is empty.
4951 */
4952 (void) ust_app_clear_quiescent_session(usess);
4953
0498a00c
MD
4954 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4955 ust_app_global_update(usess, app);
4956 }
4957
48842b30
DG
4958 rcu_read_unlock();
4959
4960 return 0;
4961}
487cf67c 4962
8be98f9a
MD
4963/*
4964 * Start tracing for the UST session.
ce34fcd0 4965 * Called with UST session lock held.
8be98f9a
MD
4966 */
4967int ust_app_stop_trace_all(struct ltt_ust_session *usess)
4968{
4969 int ret = 0;
bec39940 4970 struct lttng_ht_iter iter;
8be98f9a
MD
4971 struct ust_app *app;
4972
4973 DBG("Stopping all UST traces");
4974
bb2452c8
MD
4975 /*
4976 * Even though the stop trace might fail, flag this session inactive so
4977 * other application coming in are not started by default.
4978 */
4979 usess->active = 0;
4980
8be98f9a
MD
4981 rcu_read_lock();
4982
b34cbebf
MD
4983 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4984 ret = ust_app_stop_trace(usess, app);
4985 if (ret < 0) {
4986 /* Continue to next apps even on error */
4987 continue;
4988 }
4989 }
4990
ce34fcd0 4991 (void) ust_app_flush_session(usess);
8be98f9a
MD
4992
4993 rcu_read_unlock();
4994
4995 return 0;
4996}
4997
84cd17c6
MD
4998/*
4999 * Destroy app UST session.
5000 */
5001int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
5002{
5003 int ret = 0;
bec39940 5004 struct lttng_ht_iter iter;
84cd17c6
MD
5005 struct ust_app *app;
5006
5007 DBG("Destroy all UST traces");
5008
5009 rcu_read_lock();
5010
852d0037 5011 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
3353de95 5012 ret = destroy_trace(usess, app);
84cd17c6
MD
5013 if (ret < 0) {
5014 /* Continue to next apps even on error */
5015 continue;
5016 }
5017 }
5018
5019 rcu_read_unlock();
5020
5021 return 0;
5022}
5023
88e3c2f5 5024/* The ua_sess lock must be held by the caller. */
a9ad0c8f 5025static
88e3c2f5
JG
5026int find_or_create_ust_app_channel(
5027 struct ltt_ust_session *usess,
5028 struct ust_app_session *ua_sess,
5029 struct ust_app *app,
5030 struct ltt_ust_channel *uchan,
5031 struct ust_app_channel **ua_chan)
487cf67c 5032{
55c54cce 5033 int ret = 0;
88e3c2f5
JG
5034 struct lttng_ht_iter iter;
5035 struct lttng_ht_node_str *ua_chan_node;
5036
5037 lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &iter);
5038 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
5039 if (ua_chan_node) {
5040 *ua_chan = caa_container_of(ua_chan_node,
5041 struct ust_app_channel, node);
5042 goto end;
5043 }
5044
5045 ret = ust_app_channel_create(usess, ua_sess, uchan, app, ua_chan);
5046 if (ret) {
5047 goto end;
5048 }
5049end:
5050 return ret;
5051}
5052
5053static
5054int ust_app_channel_synchronize_event(struct ust_app_channel *ua_chan,
5055 struct ltt_ust_event *uevent, struct ust_app_session *ua_sess,
5056 struct ust_app *app)
5057{
5058 int ret = 0;
5059 struct ust_app_event *ua_event = NULL;
5060
5061 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
5062 uevent->filter, uevent->attr.loglevel, uevent->exclusion);
5063 if (!ua_event) {
5064 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
5065 if (ret < 0) {
5066 goto end;
5067 }
5068 } else {
5069 if (ua_event->enabled != uevent->enabled) {
5070 ret = uevent->enabled ?
5071 enable_ust_app_event(ua_sess, ua_event, app) :
5072 disable_ust_app_event(ua_sess, ua_event, app);
5073 }
5074 }
5075
5076end:
5077 return ret;
5078}
5079
5080/*
5081 * The caller must ensure that the application is compatible and is tracked
5082 * by the PID tracker.
5083 */
5084static
5085void ust_app_synchronize(struct ltt_ust_session *usess,
5086 struct ust_app *app)
5087{
5088 int ret = 0;
5089 struct cds_lfht_iter uchan_iter;
5090 struct ltt_ust_channel *uchan;
3d8ca23b 5091 struct ust_app_session *ua_sess = NULL;
1f3580c7 5092
88e3c2f5
JG
5093 /*
5094 * The application's configuration should only be synchronized for
5095 * active sessions.
5096 */
5097 assert(usess->active);
5098
5099 ret = find_or_create_ust_app_session(usess, app, &ua_sess, NULL);
3d8ca23b
DG
5100 if (ret < 0) {
5101 /* Tracer is probably gone or ENOMEM. */
487cf67c
DG
5102 goto error;
5103 }
3d8ca23b 5104 assert(ua_sess);
487cf67c 5105
d0b96690 5106 pthread_mutex_lock(&ua_sess->lock);
b161602a
MD
5107 if (ua_sess->deleted) {
5108 pthread_mutex_unlock(&ua_sess->lock);
5109 goto end;
5110 }
5111
88e3c2f5
JG
5112 rcu_read_lock();
5113 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &uchan_iter,
5114 uchan, node.node) {
5115 struct ust_app_channel *ua_chan;
5116 struct cds_lfht_iter uevent_iter;
5117 struct ltt_ust_event *uevent;
487cf67c 5118
31746f93 5119 /*
88e3c2f5
JG
5120 * Search for a matching ust_app_channel. If none is found,
5121 * create it. Creating the channel will cause the ua_chan
5122 * structure to be allocated, the channel buffers to be
5123 * allocated (if necessary) and sent to the application, and
5124 * all enabled contexts will be added to the channel.
31746f93 5125 */
88e3c2f5
JG
5126 ret = find_or_create_ust_app_channel(usess, ua_sess,
5127 app, uchan, &ua_chan);
5128 if (ret) {
5129 /* Tracer is probably gone or ENOMEM. */
5130 goto error_unlock;
727d5404
DG
5131 }
5132
88e3c2f5
JG
5133 if (!ua_chan) {
5134 /* ua_chan will be NULL for the metadata channel */
5135 continue;
5136 }
727d5404 5137
88e3c2f5 5138 cds_lfht_for_each_entry(uchan->events->ht, &uevent_iter, uevent,
bec39940 5139 node.node) {
88e3c2f5
JG
5140 ret = ust_app_channel_synchronize_event(ua_chan,
5141 uevent, ua_sess, app);
5142 if (ret) {
d0b96690 5143 goto error_unlock;
487cf67c 5144 }
36dc12cc 5145 }
d0b96690 5146
88e3c2f5
JG
5147 if (ua_chan->enabled != uchan->enabled) {
5148 ret = uchan->enabled ?
5149 enable_ust_app_channel(ua_sess, uchan, app) :
5150 disable_ust_app_channel(ua_sess, ua_chan, app);
5151 if (ret) {
5152 goto error_unlock;
5153 }
5154 }
36dc12cc 5155 }
88e3c2f5 5156 rcu_read_unlock();
0498a00c 5157
a9ad0c8f 5158end:
88e3c2f5 5159 pthread_mutex_unlock(&ua_sess->lock);
ffe60014 5160 /* Everything went well at this point. */
ffe60014
DG
5161 return;
5162
d0b96690 5163error_unlock:
88e3c2f5 5164 rcu_read_unlock();
d0b96690 5165 pthread_mutex_unlock(&ua_sess->lock);
487cf67c 5166error:
ffe60014 5167 if (ua_sess) {
d0b96690 5168 destroy_app_session(app, ua_sess);
ffe60014 5169 }
487cf67c
DG
5170 return;
5171}
55cc08a6 5172
a9ad0c8f
MD
5173static
5174void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app)
5175{
5176 struct ust_app_session *ua_sess;
5177
5178 ua_sess = lookup_session_by_app(usess, app);
5179 if (ua_sess == NULL) {
5180 return;
5181 }
5182 destroy_app_session(app, ua_sess);
5183}
5184
5185/*
5186 * Add channels/events from UST global domain to registered apps at sock.
5187 *
5188 * Called with session lock held.
5189 * Called with RCU read-side lock held.
5190 */
5191void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app)
5192{
5193 assert(usess);
88e3c2f5 5194 assert(usess->active);
a9ad0c8f
MD
5195
5196 DBG2("UST app global update for app sock %d for session id %" PRIu64,
5197 app->sock, usess->id);
5198
5199 if (!app->compatible) {
5200 return;
5201 }
a9ad0c8f 5202 if (trace_ust_pid_tracker_lookup(usess, app->pid)) {
88e3c2f5
JG
5203 /*
5204 * Synchronize the application's internal tracing configuration
5205 * and start tracing.
5206 */
5207 ust_app_synchronize(usess, app);
5208 ust_app_start_trace(usess, app);
a9ad0c8f
MD
5209 } else {
5210 ust_app_global_destroy(usess, app);
5211 }
5212}
5213
5214/*
5215 * Called with session lock held.
5216 */
5217void ust_app_global_update_all(struct ltt_ust_session *usess)
5218{
5219 struct lttng_ht_iter iter;
5220 struct ust_app *app;
5221
5222 rcu_read_lock();
5223 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
5224 ust_app_global_update(usess, app);
5225 }
5226 rcu_read_unlock();
5227}
5228
55cc08a6
DG
5229/*
5230 * Add context to a specific channel for global UST domain.
5231 */
5232int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
5233 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
5234{
5235 int ret = 0;
bec39940
DG
5236 struct lttng_ht_node_str *ua_chan_node;
5237 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
5238 struct ust_app_channel *ua_chan = NULL;
5239 struct ust_app_session *ua_sess;
5240 struct ust_app *app;
5241
88e3c2f5 5242 assert(usess->active);
0498a00c 5243
55cc08a6 5244 rcu_read_lock();
852d0037 5245 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
5246 if (!app->compatible) {
5247 /*
5248 * TODO: In time, we should notice the caller of this error by
5249 * telling him that this is a version error.
5250 */
5251 continue;
5252 }
55cc08a6
DG
5253 ua_sess = lookup_session_by_app(usess, app);
5254 if (ua_sess == NULL) {
5255 continue;
5256 }
5257
d0b96690 5258 pthread_mutex_lock(&ua_sess->lock);
b161602a
MD
5259
5260 if (ua_sess->deleted) {
5261 pthread_mutex_unlock(&ua_sess->lock);
5262 continue;
5263 }
5264
55cc08a6 5265 /* Lookup channel in the ust app session */
bec39940
DG
5266 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
5267 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6 5268 if (ua_chan_node == NULL) {
d0b96690 5269 goto next_app;
55cc08a6
DG
5270 }
5271 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
5272 node);
c9edf082 5273 ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app);
55cc08a6 5274 if (ret < 0) {
d0b96690 5275 goto next_app;
55cc08a6 5276 }
d0b96690
DG
5277 next_app:
5278 pthread_mutex_unlock(&ua_sess->lock);
55cc08a6
DG
5279 }
5280
55cc08a6 5281 rcu_read_unlock();
76d45b40
DG
5282 return ret;
5283}
7f79d3a1 5284
d0b96690
DG
5285/*
5286 * Receive registration and populate the given msg structure.
5287 *
5288 * On success return 0 else a negative value returned by the ustctl call.
5289 */
5290int ust_app_recv_registration(int sock, struct ust_register_msg *msg)
5291{
5292 int ret;
5293 uint32_t pid, ppid, uid, gid;
5294
5295 assert(msg);
5296
5297 ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor,
5298 &pid, &ppid, &uid, &gid,
5299 &msg->bits_per_long,
5300 &msg->uint8_t_alignment,
5301 &msg->uint16_t_alignment,
5302 &msg->uint32_t_alignment,
5303 &msg->uint64_t_alignment,
5304 &msg->long_alignment,
5305 &msg->byte_order,
5306 msg->name);
5307 if (ret < 0) {
5308 switch (-ret) {
5309 case EPIPE:
5310 case ECONNRESET:
5311 case LTTNG_UST_ERR_EXITING:
5312 DBG3("UST app recv reg message failed. Application died");
5313 break;
5314 case LTTNG_UST_ERR_UNSUP_MAJOR:
5315 ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d",
5316 msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION,
5317 LTTNG_UST_ABI_MINOR_VERSION);
5318 break;
5319 default:
5320 ERR("UST app recv reg message failed with ret %d", ret);
5321 break;
5322 }
5323 goto error;
5324 }
5325 msg->pid = (pid_t) pid;
5326 msg->ppid = (pid_t) ppid;
5327 msg->uid = (uid_t) uid;
5328 msg->gid = (gid_t) gid;
5329
5330error:
5331 return ret;
5332}
5333
10b56aef
MD
5334/*
5335 * Return a ust app session object using the application object and the
5336 * session object descriptor has a key. If not found, NULL is returned.
5337 * A RCU read side lock MUST be acquired when calling this function.
5338*/
5339static struct ust_app_session *find_session_by_objd(struct ust_app *app,
5340 int objd)
5341{
5342 struct lttng_ht_node_ulong *node;
5343 struct lttng_ht_iter iter;
5344 struct ust_app_session *ua_sess = NULL;
5345
5346 assert(app);
5347
5348 lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter);
5349 node = lttng_ht_iter_get_node_ulong(&iter);
5350 if (node == NULL) {
5351 DBG2("UST app session find by objd %d not found", objd);
5352 goto error;
5353 }
5354
5355 ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node);
5356
5357error:
5358 return ua_sess;
5359}
5360
d88aee68
DG
5361/*
5362 * Return a ust app channel object using the application object and the channel
5363 * object descriptor has a key. If not found, NULL is returned. A RCU read side
5364 * lock MUST be acquired before calling this function.
5365 */
d0b96690
DG
5366static struct ust_app_channel *find_channel_by_objd(struct ust_app *app,
5367 int objd)
5368{
5369 struct lttng_ht_node_ulong *node;
5370 struct lttng_ht_iter iter;
5371 struct ust_app_channel *ua_chan = NULL;
5372
5373 assert(app);
5374
5375 lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter);
5376 node = lttng_ht_iter_get_node_ulong(&iter);
5377 if (node == NULL) {
5378 DBG2("UST app channel find by objd %d not found", objd);
5379 goto error;
5380 }
5381
5382 ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node);
5383
5384error:
5385 return ua_chan;
5386}
5387
d88aee68
DG
5388/*
5389 * Reply to a register channel notification from an application on the notify
5390 * socket. The channel metadata is also created.
5391 *
5392 * The session UST registry lock is acquired in this function.
5393 *
5394 * On success 0 is returned else a negative value.
5395 */
8eede835 5396static int reply_ust_register_channel(int sock, int cobjd,
d0b96690
DG
5397 size_t nr_fields, struct ustctl_field *fields)
5398{
5399 int ret, ret_code = 0;
294e218e 5400 uint32_t chan_id;
7972aab2 5401 uint64_t chan_reg_key;
d0b96690
DG
5402 enum ustctl_channel_header type;
5403 struct ust_app *app;
5404 struct ust_app_channel *ua_chan;
5405 struct ust_app_session *ua_sess;
7972aab2 5406 struct ust_registry_session *registry;
45893984 5407 struct ust_registry_channel *chan_reg;
d0b96690
DG
5408
5409 rcu_read_lock();
5410
5411 /* Lookup application. If not found, there is a code flow error. */
5412 app = find_app_by_notify_sock(sock);
d88aee68 5413 if (!app) {
fad1ed2f 5414 DBG("Application socket %d is being torn down. Abort event notify",
d88aee68
DG
5415 sock);
5416 ret = 0;
5417 goto error_rcu_unlock;
5418 }
d0b96690 5419
4950b860 5420 /* Lookup channel by UST object descriptor. */
d0b96690 5421 ua_chan = find_channel_by_objd(app, cobjd);
4950b860 5422 if (!ua_chan) {
fad1ed2f 5423 DBG("Application channel is being torn down. Abort event notify");
4950b860
MD
5424 ret = 0;
5425 goto error_rcu_unlock;
5426 }
5427
d0b96690
DG
5428 assert(ua_chan->session);
5429 ua_sess = ua_chan->session;
d0b96690 5430
7972aab2
DG
5431 /* Get right session registry depending on the session buffer type. */
5432 registry = get_session_registry(ua_sess);
fad1ed2f
JR
5433 if (!registry) {
5434 DBG("Application session is being torn down. Abort event notify");
5435 ret = 0;
5436 goto error_rcu_unlock;
5437 };
45893984 5438
7972aab2
DG
5439 /* Depending on the buffer type, a different channel key is used. */
5440 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) {
5441 chan_reg_key = ua_chan->tracing_channel_id;
d0b96690 5442 } else {
7972aab2 5443 chan_reg_key = ua_chan->key;
d0b96690
DG
5444 }
5445
7972aab2
DG
5446 pthread_mutex_lock(&registry->lock);
5447
5448 chan_reg = ust_registry_channel_find(registry, chan_reg_key);
5449 assert(chan_reg);
5450
5451 if (!chan_reg->register_done) {
294e218e
MD
5452 /*
5453 * TODO: eventually use the registry event count for
5454 * this channel to better guess header type for per-pid
5455 * buffers.
5456 */
5457 type = USTCTL_CHANNEL_HEADER_LARGE;
7972aab2
DG
5458 chan_reg->nr_ctx_fields = nr_fields;
5459 chan_reg->ctx_fields = fields;
fad1ed2f 5460 fields = NULL;
7972aab2 5461 chan_reg->header_type = type;
d0b96690 5462 } else {
7972aab2
DG
5463 /* Get current already assigned values. */
5464 type = chan_reg->header_type;
d0b96690 5465 }
7972aab2
DG
5466 /* Channel id is set during the object creation. */
5467 chan_id = chan_reg->chan_id;
d0b96690
DG
5468
5469 /* Append to metadata */
7972aab2
DG
5470 if (!chan_reg->metadata_dumped) {
5471 ret_code = ust_metadata_channel_statedump(registry, chan_reg);
d0b96690
DG
5472 if (ret_code) {
5473 ERR("Error appending channel metadata (errno = %d)", ret_code);
5474 goto reply;
5475 }
5476 }
5477
5478reply:
7972aab2
DG
5479 DBG3("UST app replying to register channel key %" PRIu64
5480 " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type,
5481 ret_code);
d0b96690
DG
5482
5483 ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code);
5484 if (ret < 0) {
5485 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
5486 ERR("UST app reply channel failed with ret %d", ret);
5487 } else {
5488 DBG3("UST app reply channel failed. Application died");
5489 }
5490 goto error;
5491 }
5492
7972aab2
DG
5493 /* This channel registry registration is completed. */
5494 chan_reg->register_done = 1;
5495
d0b96690 5496error:
7972aab2 5497 pthread_mutex_unlock(&registry->lock);
d88aee68 5498error_rcu_unlock:
d0b96690 5499 rcu_read_unlock();
fad1ed2f 5500 free(fields);
d0b96690
DG
5501 return ret;
5502}
5503
d88aee68
DG
5504/*
5505 * Add event to the UST channel registry. When the event is added to the
5506 * registry, the metadata is also created. Once done, this replies to the
5507 * application with the appropriate error code.
5508 *
5509 * The session UST registry lock is acquired in the function.
5510 *
5511 * On success 0 is returned else a negative value.
5512 */
d0b96690 5513static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name,
2106efa0
PP
5514 char *sig, size_t nr_fields, struct ustctl_field *fields,
5515 int loglevel_value, char *model_emf_uri)
d0b96690
DG
5516{
5517 int ret, ret_code;
5518 uint32_t event_id = 0;
7972aab2 5519 uint64_t chan_reg_key;
d0b96690
DG
5520 struct ust_app *app;
5521 struct ust_app_channel *ua_chan;
5522 struct ust_app_session *ua_sess;
7972aab2 5523 struct ust_registry_session *registry;
d0b96690
DG
5524
5525 rcu_read_lock();
5526
5527 /* Lookup application. If not found, there is a code flow error. */
5528 app = find_app_by_notify_sock(sock);
d88aee68 5529 if (!app) {
fad1ed2f 5530 DBG("Application socket %d is being torn down. Abort event notify",
d88aee68
DG
5531 sock);
5532 ret = 0;
5533 goto error_rcu_unlock;
5534 }
d0b96690 5535
4950b860 5536 /* Lookup channel by UST object descriptor. */
d0b96690 5537 ua_chan = find_channel_by_objd(app, cobjd);
4950b860 5538 if (!ua_chan) {
fad1ed2f 5539 DBG("Application channel is being torn down. Abort event notify");
4950b860
MD
5540 ret = 0;
5541 goto error_rcu_unlock;
5542 }
5543
d0b96690
DG
5544 assert(ua_chan->session);
5545 ua_sess = ua_chan->session;
5546
7972aab2 5547 registry = get_session_registry(ua_sess);
fad1ed2f
JR
5548 if (!registry) {
5549 DBG("Application session is being torn down. Abort event notify");
5550 ret = 0;
5551 goto error_rcu_unlock;
5552 }
7972aab2
DG
5553
5554 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) {
5555 chan_reg_key = ua_chan->tracing_channel_id;
5556 } else {
5557 chan_reg_key = ua_chan->key;
5558 }
5559
5560 pthread_mutex_lock(&registry->lock);
d0b96690 5561
d5d629b5
DG
5562 /*
5563 * From this point on, this call acquires the ownership of the sig, fields
5564 * and model_emf_uri meaning any free are done inside it if needed. These
5565 * three variables MUST NOT be read/write after this.
5566 */
7972aab2 5567 ret_code = ust_registry_create_event(registry, chan_reg_key,
2106efa0
PP
5568 sobjd, cobjd, name, sig, nr_fields, fields,
5569 loglevel_value, model_emf_uri, ua_sess->buffer_type,
5570 &event_id, app);
fad1ed2f
JR
5571 sig = NULL;
5572 fields = NULL;
5573 model_emf_uri = NULL;
d0b96690
DG
5574
5575 /*
5576 * The return value is returned to ustctl so in case of an error, the
5577 * application can be notified. In case of an error, it's important not to
5578 * return a negative error or else the application will get closed.
5579 */
5580 ret = ustctl_reply_register_event(sock, event_id, ret_code);
5581 if (ret < 0) {
5582 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
5583 ERR("UST app reply event failed with ret %d", ret);
5584 } else {
5585 DBG3("UST app reply event failed. Application died");
5586 }
5587 /*
5588 * No need to wipe the create event since the application socket will
5589 * get close on error hence cleaning up everything by itself.
5590 */
5591 goto error;
5592 }
5593
7972aab2
DG
5594 DBG3("UST registry event %s with id %" PRId32 " added successfully",
5595 name, event_id);
d88aee68 5596
d0b96690 5597error:
7972aab2 5598 pthread_mutex_unlock(&registry->lock);
d88aee68 5599error_rcu_unlock:
d0b96690 5600 rcu_read_unlock();
fad1ed2f
JR
5601 free(sig);
5602 free(fields);
5603 free(model_emf_uri);
d0b96690
DG
5604 return ret;
5605}
5606
10b56aef
MD
5607/*
5608 * Add enum to the UST session registry. Once done, this replies to the
5609 * application with the appropriate error code.
5610 *
5611 * The session UST registry lock is acquired within this function.
5612 *
5613 * On success 0 is returned else a negative value.
5614 */
5615static int add_enum_ust_registry(int sock, int sobjd, char *name,
5616 struct ustctl_enum_entry *entries, size_t nr_entries)
5617{
5618 int ret = 0, ret_code;
5619 struct ust_app *app;
5620 struct ust_app_session *ua_sess;
5621 struct ust_registry_session *registry;
5622 uint64_t enum_id = -1ULL;
5623
5624 rcu_read_lock();
5625
5626 /* Lookup application. If not found, there is a code flow error. */
5627 app = find_app_by_notify_sock(sock);
5628 if (!app) {
5629 /* Return an error since this is not an error */
5630 DBG("Application socket %d is being torn down. Aborting enum registration",
5631 sock);
5632 free(entries);
5633 goto error_rcu_unlock;
5634 }
5635
5636 /* Lookup session by UST object descriptor. */
5637 ua_sess = find_session_by_objd(app, sobjd);
5638 if (!ua_sess) {
5639 /* Return an error since this is not an error */
fad1ed2f 5640 DBG("Application session is being torn down (session not found). Aborting enum registration.");
10b56aef
MD
5641 free(entries);
5642 goto error_rcu_unlock;
5643 }
5644
5645 registry = get_session_registry(ua_sess);
fad1ed2f
JR
5646 if (!registry) {
5647 DBG("Application session is being torn down (registry not found). Aborting enum registration.");
5648 free(entries);
5649 goto error_rcu_unlock;
5650 }
10b56aef
MD
5651
5652 pthread_mutex_lock(&registry->lock);
5653
5654 /*
5655 * From this point on, the callee acquires the ownership of
5656 * entries. The variable entries MUST NOT be read/written after
5657 * call.
5658 */
5659 ret_code = ust_registry_create_or_find_enum(registry, sobjd, name,
5660 entries, nr_entries, &enum_id);
5661 entries = NULL;
5662
5663 /*
5664 * The return value is returned to ustctl so in case of an error, the
5665 * application can be notified. In case of an error, it's important not to
5666 * return a negative error or else the application will get closed.
5667 */
5668 ret = ustctl_reply_register_enum(sock, enum_id, ret_code);
5669 if (ret < 0) {
5670 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
5671 ERR("UST app reply enum failed with ret %d", ret);
5672 } else {
5673 DBG3("UST app reply enum failed. Application died");
5674 }
5675 /*
5676 * No need to wipe the create enum since the application socket will
5677 * get close on error hence cleaning up everything by itself.
5678 */
5679 goto error;
5680 }
5681
5682 DBG3("UST registry enum %s added successfully or already found", name);
5683
5684error:
5685 pthread_mutex_unlock(&registry->lock);
5686error_rcu_unlock:
5687 rcu_read_unlock();
5688 return ret;
5689}
5690
d88aee68
DG
5691/*
5692 * Handle application notification through the given notify socket.
5693 *
5694 * Return 0 on success or else a negative value.
5695 */
d0b96690
DG
5696int ust_app_recv_notify(int sock)
5697{
5698 int ret;
5699 enum ustctl_notify_cmd cmd;
5700
5701 DBG3("UST app receiving notify from sock %d", sock);
5702
5703 ret = ustctl_recv_notify(sock, &cmd);
5704 if (ret < 0) {
5705 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
5706 ERR("UST app recv notify failed with ret %d", ret);
5707 } else {
5708 DBG3("UST app recv notify failed. Application died");
5709 }
5710 goto error;
5711 }
5712
5713 switch (cmd) {
5714 case USTCTL_NOTIFY_CMD_EVENT:
5715 {
2106efa0 5716 int sobjd, cobjd, loglevel_value;
d0b96690
DG
5717 char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri;
5718 size_t nr_fields;
5719 struct ustctl_field *fields;
5720
5721 DBG2("UST app ustctl register event received");
5722
2106efa0
PP
5723 ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name,
5724 &loglevel_value, &sig, &nr_fields, &fields,
5725 &model_emf_uri);
d0b96690
DG
5726 if (ret < 0) {
5727 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
5728 ERR("UST app recv event failed with ret %d", ret);
5729 } else {
5730 DBG3("UST app recv event failed. Application died");
5731 }
5732 goto error;
5733 }
5734
d5d629b5
DG
5735 /*
5736 * Add event to the UST registry coming from the notify socket. This
5737 * call will free if needed the sig, fields and model_emf_uri. This
5738 * code path loses the ownsership of these variables and transfer them
5739 * to the this function.
5740 */
d0b96690 5741 ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields,
2106efa0 5742 fields, loglevel_value, model_emf_uri);
d0b96690
DG
5743 if (ret < 0) {
5744 goto error;
5745 }
5746
5747 break;
5748 }
5749 case USTCTL_NOTIFY_CMD_CHANNEL:
5750 {
5751 int sobjd, cobjd;
5752 size_t nr_fields;
5753 struct ustctl_field *fields;
5754
5755 DBG2("UST app ustctl register channel received");
5756
5757 ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields,
5758 &fields);
5759 if (ret < 0) {
5760 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
5761 ERR("UST app recv channel failed with ret %d", ret);
5762 } else {
5763 DBG3("UST app recv channel failed. Application died");
5764 }
5765 goto error;
5766 }
5767
d5d629b5
DG
5768 /*
5769 * The fields ownership are transfered to this function call meaning
5770 * that if needed it will be freed. After this, it's invalid to access
5771 * fields or clean it up.
5772 */
8eede835 5773 ret = reply_ust_register_channel(sock, cobjd, nr_fields,
d0b96690
DG
5774 fields);
5775 if (ret < 0) {
5776 goto error;
5777 }
5778
5779 break;
5780 }
10b56aef
MD
5781 case USTCTL_NOTIFY_CMD_ENUM:
5782 {
5783 int sobjd;
5784 char name[LTTNG_UST_SYM_NAME_LEN];
5785 size_t nr_entries;
5786 struct ustctl_enum_entry *entries;
5787
5788 DBG2("UST app ustctl register enum received");
5789
5790 ret = ustctl_recv_register_enum(sock, &sobjd, name,
5791 &entries, &nr_entries);
5792 if (ret < 0) {
5793 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
5794 ERR("UST app recv enum failed with ret %d", ret);
5795 } else {
5796 DBG3("UST app recv enum failed. Application died");
5797 }
5798 goto error;
5799 }
5800
5801 /* Callee assumes ownership of entries */
5802 ret = add_enum_ust_registry(sock, sobjd, name,
5803 entries, nr_entries);
5804 if (ret < 0) {
5805 goto error;
5806 }
5807
5808 break;
5809 }
d0b96690
DG
5810 default:
5811 /* Should NEVER happen. */
5812 assert(0);
5813 }
5814
5815error:
5816 return ret;
5817}
d88aee68
DG
5818
5819/*
5820 * Once the notify socket hangs up, this is called. First, it tries to find the
5821 * corresponding application. On failure, the call_rcu to close the socket is
5822 * executed. If an application is found, it tries to delete it from the notify
5823 * socket hash table. Whathever the result, it proceeds to the call_rcu.
5824 *
5825 * Note that an object needs to be allocated here so on ENOMEM failure, the
5826 * call RCU is not done but the rest of the cleanup is.
5827 */
5828void ust_app_notify_sock_unregister(int sock)
5829{
5830 int err_enomem = 0;
5831 struct lttng_ht_iter iter;
5832 struct ust_app *app;
5833 struct ust_app_notify_sock_obj *obj;
5834
5835 assert(sock >= 0);
5836
5837 rcu_read_lock();
5838
5839 obj = zmalloc(sizeof(*obj));
5840 if (!obj) {
5841 /*
5842 * An ENOMEM is kind of uncool. If this strikes we continue the
5843 * procedure but the call_rcu will not be called. In this case, we
5844 * accept the fd leak rather than possibly creating an unsynchronized
5845 * state between threads.
5846 *
5847 * TODO: The notify object should be created once the notify socket is
5848 * registered and stored independantely from the ust app object. The
5849 * tricky part is to synchronize the teardown of the application and
5850 * this notify object. Let's keep that in mind so we can avoid this
5851 * kind of shenanigans with ENOMEM in the teardown path.
5852 */
5853 err_enomem = 1;
5854 } else {
5855 obj->fd = sock;
5856 }
5857
5858 DBG("UST app notify socket unregister %d", sock);
5859
5860 /*
5861 * Lookup application by notify socket. If this fails, this means that the
5862 * hash table delete has already been done by the application
5863 * unregistration process so we can safely close the notify socket in a
5864 * call RCU.
5865 */
5866 app = find_app_by_notify_sock(sock);
5867 if (!app) {
5868 goto close_socket;
5869 }
5870
5871 iter.iter.node = &app->notify_sock_n.node;
5872
5873 /*
5874 * Whatever happens here either we fail or succeed, in both cases we have
5875 * to close the socket after a grace period to continue to the call RCU
5876 * here. If the deletion is successful, the application is not visible
5877 * anymore by other threads and is it fails it means that it was already
5878 * deleted from the hash table so either way we just have to close the
5879 * socket.
5880 */
5881 (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
5882
5883close_socket:
5884 rcu_read_unlock();
5885
5886 /*
5887 * Close socket after a grace period to avoid for the socket to be reused
5888 * before the application object is freed creating potential race between
5889 * threads trying to add unique in the global hash table.
5890 */
5891 if (!err_enomem) {
5892 call_rcu(&obj->head, close_notify_sock_rcu);
5893 }
5894}
f45e313d
DG
5895
5896/*
5897 * Destroy a ust app data structure and free its memory.
5898 */
5899void ust_app_destroy(struct ust_app *app)
5900{
5901 if (!app) {
5902 return;
5903 }
5904
5905 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
5906}
6dc3064a
DG
5907
5908/*
5909 * Take a snapshot for a given UST session. The snapshot is sent to the given
5910 * output.
5911 *
9a654598 5912 * Returns LTTNG_OK on success or a LTTNG_ERR error code.
6dc3064a 5913 */
9a654598 5914enum lttng_error_code ust_app_snapshot_record(struct ltt_ust_session *usess,
d07ceecd
MD
5915 struct snapshot_output *output, int wait,
5916 uint64_t nb_packets_per_stream)
6dc3064a
DG
5917{
5918 int ret = 0;
9a654598 5919 enum lttng_error_code status = LTTNG_OK;
6dc3064a
DG
5920 struct lttng_ht_iter iter;
5921 struct ust_app *app;
af706bb7 5922 char pathname[PATH_MAX];
e32d7f27 5923 struct ltt_session *session = NULL;
e098433c 5924 uint64_t trace_archive_id;
6dc3064a
DG
5925
5926 assert(usess);
5927 assert(output);
5928
5929 rcu_read_lock();
5930
e098433c
JG
5931 session = session_find_by_id(usess->id);
5932 assert(session);
5933 assert(pthread_mutex_trylock(&session->lock));
5934 assert(session_trylock_list());
5935 trace_archive_id = session->current_archive_id;
5936
8c924c7b
MD
5937 switch (usess->buffer_type) {
5938 case LTTNG_BUFFER_PER_UID:
5939 {
5940 struct buffer_reg_uid *reg;
6dc3064a 5941
8c924c7b
MD
5942 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
5943 struct buffer_reg_channel *reg_chan;
5944 struct consumer_socket *socket;
6dc3064a 5945
2b269489
JR
5946 if (!reg->registry->reg.ust->metadata_key) {
5947 /* Skip since no metadata is present */
5948 continue;
5949 }
5950
8c924c7b
MD
5951 /* Get consumer socket to use to push the metadata.*/
5952 socket = consumer_find_socket_by_bitness(reg->bits_per_long,
5953 usess->consumer);
5954 if (!socket) {
9a654598 5955 status = LTTNG_ERR_INVALID;
8c924c7b
MD
5956 goto error;
5957 }
6dc3064a 5958
8c924c7b
MD
5959 memset(pathname, 0, sizeof(pathname));
5960 ret = snprintf(pathname, sizeof(pathname),
5961 DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH,
5962 reg->uid, reg->bits_per_long);
5963 if (ret < 0) {
5964 PERROR("snprintf snapshot path");
9a654598 5965 status = LTTNG_ERR_INVALID;
8c924c7b
MD
5966 goto error;
5967 }
5968
5969 /* Add the UST default trace dir to path. */
5970 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
5971 reg_chan, node.node) {
9a654598 5972 status = consumer_snapshot_channel(socket,
e098433c
JG
5973 reg_chan->consumer_key,
5974 output, 0, usess->uid,
5975 usess->gid, pathname, wait,
5976 nb_packets_per_stream,
5977 trace_archive_id);
9a654598 5978 if (status != LTTNG_OK) {
8c924c7b
MD
5979 goto error;
5980 }
5981 }
9a654598 5982 status = consumer_snapshot_channel(socket,
68808f4e 5983 reg->registry->reg.ust->metadata_key, output, 1,
e098433c
JG
5984 usess->uid, usess->gid, pathname, wait, 0,
5985 trace_archive_id);
9a654598 5986 if (status != LTTNG_OK) {
8c924c7b
MD
5987 goto error;
5988 }
af706bb7 5989 }
8c924c7b
MD
5990 break;
5991 }
5992 case LTTNG_BUFFER_PER_PID:
5993 {
5994 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
5995 struct consumer_socket *socket;
5996 struct lttng_ht_iter chan_iter;
5997 struct ust_app_channel *ua_chan;
5998 struct ust_app_session *ua_sess;
5999 struct ust_registry_session *registry;
6000
6001 ua_sess = lookup_session_by_app(usess, app);
6002 if (!ua_sess) {
6003 /* Session not associated with this app. */
6004 continue;
6005 }
af706bb7 6006
8c924c7b
MD
6007 /* Get the right consumer socket for the application. */
6008 socket = consumer_find_socket_by_bitness(app->bits_per_long,
6009 output->consumer);
6010 if (!socket) {
9a654598 6011 status = LTTNG_ERR_INVALID;
5c786ded
JD
6012 goto error;
6013 }
6014
8c924c7b
MD
6015 /* Add the UST default trace dir to path. */
6016 memset(pathname, 0, sizeof(pathname));
6017 ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s",
6018 ua_sess->path);
6dc3064a 6019 if (ret < 0) {
9a654598 6020 status = LTTNG_ERR_INVALID;
8c924c7b 6021 PERROR("snprintf snapshot path");
6dc3064a
DG
6022 goto error;
6023 }
6dc3064a 6024
8c924c7b
MD
6025 cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
6026 ua_chan, node.node) {
9a654598 6027 status = consumer_snapshot_channel(socket,
e098433c
JG
6028 ua_chan->key, output,
6029 0, ua_sess->euid, ua_sess->egid,
6030 pathname, wait,
6031 nb_packets_per_stream,
6032 trace_archive_id);
9a654598
JG
6033 switch (status) {
6034 case LTTNG_OK:
6035 break;
6036 case LTTNG_ERR_CHAN_NOT_FOUND:
6037 continue;
6038 default:
8c924c7b
MD
6039 goto error;
6040 }
6041 }
6042
6043 registry = get_session_registry(ua_sess);
fad1ed2f 6044 if (!registry) {
9bbfb88c
MD
6045 DBG("Application session is being torn down. Skip application.");
6046 continue;
fad1ed2f 6047 }
9a654598 6048 status = consumer_snapshot_channel(socket,
e098433c
JG
6049 registry->metadata_key, output,
6050 1, ua_sess->euid, ua_sess->egid,
6051 pathname, wait, 0,
6052 trace_archive_id);
9a654598
JG
6053 switch (status) {
6054 case LTTNG_OK:
6055 break;
6056 case LTTNG_ERR_CHAN_NOT_FOUND:
6057 continue;
6058 default:
8c924c7b
MD
6059 goto error;
6060 }
6061 }
6062 break;
6063 }
6064 default:
6065 assert(0);
6066 break;
6dc3064a
DG
6067 }
6068
6069error:
6070 rcu_read_unlock();
e32d7f27
JG
6071 if (session) {
6072 session_put(session);
6073 }
9a654598 6074 return status;
6dc3064a 6075}
5c786ded
JD
6076
6077/*
d07ceecd 6078 * Return the size taken by one more packet per stream.
5c786ded 6079 */
d07ceecd
MD
6080uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session *usess,
6081 uint64_t cur_nr_packets)
5c786ded 6082{
d07ceecd 6083 uint64_t tot_size = 0;
5c786ded
JD
6084 struct ust_app *app;
6085 struct lttng_ht_iter iter;
6086
6087 assert(usess);
6088
6089 switch (usess->buffer_type) {
6090 case LTTNG_BUFFER_PER_UID:
6091 {
6092 struct buffer_reg_uid *reg;
6093
6094 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
6095 struct buffer_reg_channel *reg_chan;
6096
b7064eaa 6097 rcu_read_lock();
5c786ded
JD
6098 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
6099 reg_chan, node.node) {
d07ceecd
MD
6100 if (cur_nr_packets >= reg_chan->num_subbuf) {
6101 /*
6102 * Don't take channel into account if we
6103 * already grab all its packets.
6104 */
6105 continue;
6106 }
6107 tot_size += reg_chan->subbuf_size * reg_chan->stream_count;
5c786ded 6108 }
b7064eaa 6109 rcu_read_unlock();
5c786ded
JD
6110 }
6111 break;
6112 }
6113 case LTTNG_BUFFER_PER_PID:
6114 {
6115 rcu_read_lock();
6116 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
6117 struct ust_app_channel *ua_chan;
6118 struct ust_app_session *ua_sess;
6119 struct lttng_ht_iter chan_iter;
6120
6121 ua_sess = lookup_session_by_app(usess, app);
6122 if (!ua_sess) {
6123 /* Session not associated with this app. */
6124 continue;
6125 }
6126
6127 cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
6128 ua_chan, node.node) {
d07ceecd
MD
6129 if (cur_nr_packets >= ua_chan->attr.num_subbuf) {
6130 /*
6131 * Don't take channel into account if we
6132 * already grab all its packets.
6133 */
6134 continue;
6135 }
6136 tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count;
5c786ded
JD
6137 }
6138 }
6139 rcu_read_unlock();
6140 break;
6141 }
6142 default:
6143 assert(0);
6144 break;
6145 }
6146
d07ceecd 6147 return tot_size;
5c786ded 6148}
fb83fe64
JD
6149
6150int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id,
6151 struct cds_list_head *buffer_reg_uid_list,
6152 struct consumer_output *consumer, uint64_t uchan_id,
6153 int overwrite, uint64_t *discarded, uint64_t *lost)
6154{
6155 int ret;
6156 uint64_t consumer_chan_key;
6157
70dd8162
MD
6158 *discarded = 0;
6159 *lost = 0;
6160
fb83fe64 6161 ret = buffer_reg_uid_consumer_channel_key(
76604852 6162 buffer_reg_uid_list, uchan_id, &consumer_chan_key);
fb83fe64 6163 if (ret < 0) {
70dd8162
MD
6164 /* Not found */
6165 ret = 0;
fb83fe64
JD
6166 goto end;
6167 }
6168
6169 if (overwrite) {
6170 ret = consumer_get_lost_packets(ust_session_id,
6171 consumer_chan_key, consumer, lost);
6172 } else {
6173 ret = consumer_get_discarded_events(ust_session_id,
6174 consumer_chan_key, consumer, discarded);
6175 }
6176
6177end:
6178 return ret;
6179}
6180
6181int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess,
6182 struct ltt_ust_channel *uchan,
6183 struct consumer_output *consumer, int overwrite,
6184 uint64_t *discarded, uint64_t *lost)
6185{
6186 int ret = 0;
6187 struct lttng_ht_iter iter;
6188 struct lttng_ht_node_str *ua_chan_node;
6189 struct ust_app *app;
6190 struct ust_app_session *ua_sess;
6191 struct ust_app_channel *ua_chan;
6192
70dd8162
MD
6193 *discarded = 0;
6194 *lost = 0;
6195
fb83fe64
JD
6196 rcu_read_lock();
6197 /*
70dd8162
MD
6198 * Iterate over every registered applications. Sum counters for
6199 * all applications containing requested session and channel.
fb83fe64
JD
6200 */
6201 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
6202 struct lttng_ht_iter uiter;
6203
6204 ua_sess = lookup_session_by_app(usess, app);
6205 if (ua_sess == NULL) {
6206 continue;
6207 }
6208
6209 /* Get channel */
ee022399 6210 lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter);
fb83fe64
JD
6211 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
6212 /* If the session is found for the app, the channel must be there */
6213 assert(ua_chan_node);
6214
6215 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
6216
6217 if (overwrite) {
70dd8162
MD
6218 uint64_t _lost;
6219
fb83fe64 6220 ret = consumer_get_lost_packets(usess->id, ua_chan->key,
70dd8162
MD
6221 consumer, &_lost);
6222 if (ret < 0) {
6223 break;
6224 }
6225 (*lost) += _lost;
fb83fe64 6226 } else {
70dd8162
MD
6227 uint64_t _discarded;
6228
fb83fe64 6229 ret = consumer_get_discarded_events(usess->id,
70dd8162
MD
6230 ua_chan->key, consumer, &_discarded);
6231 if (ret < 0) {
6232 break;
6233 }
6234 (*discarded) += _discarded;
fb83fe64 6235 }
fb83fe64
JD
6236 }
6237
fb83fe64
JD
6238 rcu_read_unlock();
6239 return ret;
6240}
c2561365
JD
6241
6242static
6243int ust_app_regenerate_statedump(struct ltt_ust_session *usess,
6244 struct ust_app *app)
6245{
6246 int ret = 0;
6247 struct ust_app_session *ua_sess;
6248
6249 DBG("Regenerating the metadata for ust app pid %d", app->pid);
6250
6251 rcu_read_lock();
6252
6253 ua_sess = lookup_session_by_app(usess, app);
6254 if (ua_sess == NULL) {
6255 /* The session is in teardown process. Ignore and continue. */
6256 goto end;
6257 }
6258
6259 pthread_mutex_lock(&ua_sess->lock);
6260
6261 if (ua_sess->deleted) {
6262 goto end_unlock;
6263 }
6264
6265 pthread_mutex_lock(&app->sock_lock);
6266 ret = ustctl_regenerate_statedump(app->sock, ua_sess->handle);
6267 pthread_mutex_unlock(&app->sock_lock);
6268
6269end_unlock:
6270 pthread_mutex_unlock(&ua_sess->lock);
6271
6272end:
6273 rcu_read_unlock();
6274 health_code_update();
6275 return ret;
6276}
6277
6278/*
6279 * Regenerate the statedump for each app in the session.
6280 */
6281int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess)
6282{
6283 int ret = 0;
6284 struct lttng_ht_iter iter;
6285 struct ust_app *app;
6286
6287 DBG("Regenerating the metadata for all UST apps");
6288
6289 rcu_read_lock();
6290
6291 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
6292 if (!app->compatible) {
6293 continue;
6294 }
6295
6296 ret = ust_app_regenerate_statedump(usess, app);
6297 if (ret < 0) {
6298 /* Continue to the next app even on error */
6299 continue;
6300 }
6301 }
6302
6303 rcu_read_unlock();
6304
6305 return 0;
6306}
5c408ad8
JD
6307
6308/*
6309 * Rotate all the channels of a session.
6310 *
6f6d3b69 6311 * Return LTTNG_OK on success or else an LTTng error code.
5c408ad8 6312 */
6f6d3b69 6313enum lttng_error_code ust_app_rotate_session(struct ltt_session *session)
5c408ad8 6314{
6f6d3b69
MD
6315 int ret;
6316 enum lttng_error_code cmd_ret = LTTNG_OK;
5c408ad8
JD
6317 struct lttng_ht_iter iter;
6318 struct ust_app *app;
6319 struct ltt_ust_session *usess = session->ust_session;
6320 char pathname[LTTNG_PATH_MAX];
6321
6322 assert(usess);
6323
6324 rcu_read_lock();
6325
6326 switch (usess->buffer_type) {
6327 case LTTNG_BUFFER_PER_UID:
6328 {
6329 struct buffer_reg_uid *reg;
6330
6331 cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) {
6332 struct buffer_reg_channel *reg_chan;
6333 struct consumer_socket *socket;
6334
6335 /* Get consumer socket to use to push the metadata.*/
6336 socket = consumer_find_socket_by_bitness(reg->bits_per_long,
6337 usess->consumer);
6338 if (!socket) {
6f6d3b69 6339 cmd_ret = LTTNG_ERR_INVALID;
5c408ad8
JD
6340 goto error;
6341 }
6342
5c408ad8
JD
6343 ret = snprintf(pathname, sizeof(pathname),
6344 DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH,
6345 reg->uid, reg->bits_per_long);
6346 if (ret < 0 || ret == sizeof(pathname)) {
6347 PERROR("Failed to format rotation path");
6f6d3b69 6348 cmd_ret = LTTNG_ERR_INVALID;
5c408ad8
JD
6349 goto error;
6350 }
6351
6352 /* Rotate the data channels. */
6353 cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
6354 reg_chan, node.node) {
5c408ad8
JD
6355 ret = consumer_rotate_channel(socket,
6356 reg_chan->consumer_key,
6357 usess->uid, usess->gid,
6358 usess->consumer, pathname,
6359 /* is_metadata_channel */ false,
92816cc3 6360 session->current_archive_id);
5c408ad8 6361 if (ret < 0) {
6f6d3b69 6362 cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER;
5c408ad8
JD
6363 goto error;
6364 }
6365 }
6366
6367 (void) push_metadata(reg->registry->reg.ust, usess->consumer);
6368
6369 ret = consumer_rotate_channel(socket,
6370 reg->registry->reg.ust->metadata_key,
6371 usess->uid, usess->gid,
6372 usess->consumer, pathname,
6373 /* is_metadata_channel */ true,
92816cc3 6374 session->current_archive_id);
5c408ad8 6375 if (ret < 0) {
6f6d3b69 6376 cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER;
5c408ad8
JD
6377 goto error;
6378 }
5c408ad8
JD
6379 }
6380 break;
6381 }
6382 case LTTNG_BUFFER_PER_PID:
6383 {
6384 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
6385 struct consumer_socket *socket;
6386 struct lttng_ht_iter chan_iter;
6387 struct ust_app_channel *ua_chan;
6388 struct ust_app_session *ua_sess;
6389 struct ust_registry_session *registry;
6390
6391 ua_sess = lookup_session_by_app(usess, app);
6392 if (!ua_sess) {
6393 /* Session not associated with this app. */
6394 continue;
6395 }
6396 ret = snprintf(pathname, sizeof(pathname),
6397 DEFAULT_UST_TRACE_DIR "/%s",
6398 ua_sess->path);
6399 if (ret < 0 || ret == sizeof(pathname)) {
6400 PERROR("Failed to format rotation path");
6f6d3b69 6401 cmd_ret = LTTNG_ERR_INVALID;
5c408ad8
JD
6402 goto error;
6403 }
6404
6405 /* Get the right consumer socket for the application. */
6406 socket = consumer_find_socket_by_bitness(app->bits_per_long,
6407 usess->consumer);
6408 if (!socket) {
6f6d3b69 6409 cmd_ret = LTTNG_ERR_INVALID;
5c408ad8
JD
6410 goto error;
6411 }
6412
6413 registry = get_session_registry(ua_sess);
6414 if (!registry) {
6f6d3b69
MD
6415 DBG("Application session is being torn down. Skip application.");
6416 continue;
5c408ad8
JD
6417 }
6418
5c408ad8
JD
6419
6420 /* Rotate the data channels. */
6421 cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
6422 ua_chan, node.node) {
5c408ad8
JD
6423 ret = consumer_rotate_channel(socket, ua_chan->key,
6424 ua_sess->euid, ua_sess->egid,
6425 ua_sess->consumer, pathname,
6426 /* is_metadata_channel */ false,
92816cc3 6427 session->current_archive_id);
5c408ad8 6428 if (ret < 0) {
6f6d3b69
MD
6429 /* Per-PID buffer and application going away. */
6430 if (ret == -LTTNG_ERR_CHAN_NOT_FOUND)
6431 continue;
6432 cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER;
5c408ad8
JD
6433 goto error;
6434 }
6435 }
6436
6437 /* Rotate the metadata channel. */
6438 (void) push_metadata(registry, usess->consumer);
6439 ret = consumer_rotate_channel(socket, registry->metadata_key,
6440 ua_sess->euid, ua_sess->egid,
6441 ua_sess->consumer, pathname,
6442 /* is_metadata_channel */ true,
92816cc3 6443 session->current_archive_id);
5c408ad8 6444 if (ret < 0) {
6f6d3b69
MD
6445 /* Per-PID buffer and application going away. */
6446 if (ret == -LTTNG_ERR_CHAN_NOT_FOUND)
6447 continue;
6448 cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER;
5c408ad8
JD
6449 goto error;
6450 }
5c408ad8
JD
6451 }
6452 break;
6453 }
6454 default:
6455 assert(0);
6456 break;
6457 }
6458
6f6d3b69 6459 cmd_ret = LTTNG_OK;
5c408ad8
JD
6460
6461error:
6462 rcu_read_unlock();
6f6d3b69 6463 return cmd_ret;
5c408ad8 6464}
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