Fix: support VPATH build for tests
[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.c
CommitLineData
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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AM
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
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7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
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13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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16 */
17
18#define _GNU_SOURCE
19#include <errno.h>
7972aab2 20#include <inttypes.h>
91d76f53
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21#include <pthread.h>
22#include <stdio.h>
23#include <stdlib.h>
099e26bd 24#include <string.h>
aba8e916
DG
25#include <sys/stat.h>
26#include <sys/types.h>
099e26bd 27#include <unistd.h>
0df502fd 28#include <urcu/compiler.h>
fb54cdbf 29#include <lttng/ust-error.h>
331744e3 30#include <signal.h>
bec39940 31
990570ed 32#include <common/common.h>
86acf0da 33#include <common/sessiond-comm/sessiond-comm.h>
1e307fab 34
7972aab2 35#include "buffer-registry.h"
86acf0da
DG
36#include "fd-limit.h"
37#include "health.h"
56fff090 38#include "ust-app.h"
48842b30 39#include "ust-consumer.h"
d80a6244 40#include "ust-ctl.h"
0b2dc8df 41#include "utils.h"
d80a6244 42
d9bf3ca4
MD
43/* Next available channel key. Access under next_channel_key_lock. */
44static uint64_t _next_channel_key;
45static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER;
46
47/* Next available session ID. Access under next_session_id_lock. */
48static uint64_t _next_session_id;
49static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER;
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50
51/*
d9bf3ca4 52 * Return the incremented value of next_channel_key.
ffe60014 53 */
d9bf3ca4 54static uint64_t get_next_channel_key(void)
ffe60014 55{
d9bf3ca4
MD
56 uint64_t ret;
57
58 pthread_mutex_lock(&next_channel_key_lock);
59 ret = ++_next_channel_key;
60 pthread_mutex_unlock(&next_channel_key_lock);
61 return ret;
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62}
63
64/*
7972aab2 65 * Return the atomically incremented value of next_session_id.
ffe60014 66 */
d9bf3ca4 67static uint64_t get_next_session_id(void)
ffe60014 68{
d9bf3ca4
MD
69 uint64_t ret;
70
71 pthread_mutex_lock(&next_session_id_lock);
72 ret = ++_next_session_id;
73 pthread_mutex_unlock(&next_session_id_lock);
74 return ret;
ffe60014
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75}
76
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77static void copy_channel_attr_to_ustctl(
78 struct ustctl_consumer_channel_attr *attr,
79 struct lttng_ust_channel_attr *uattr)
80{
81 /* Copy event attributes since the layout is different. */
82 attr->subbuf_size = uattr->subbuf_size;
83 attr->num_subbuf = uattr->num_subbuf;
84 attr->overwrite = uattr->overwrite;
85 attr->switch_timer_interval = uattr->switch_timer_interval;
86 attr->read_timer_interval = uattr->read_timer_interval;
87 attr->output = uattr->output;
88}
89
025faf73
DG
90/*
91 * Match function for the hash table lookup.
92 *
93 * It matches an ust app event based on three attributes which are the event
94 * name, the filter bytecode and the loglevel.
95 */
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96static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key)
97{
98 struct ust_app_event *event;
99 const struct ust_app_ht_key *key;
100
101 assert(node);
102 assert(_key);
103
104 event = caa_container_of(node, struct ust_app_event, node.node);
105 key = _key;
106
107 /* Match the 3 elements of the key: name, filter and loglevel. */
108
109 /* Event name */
110 if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
111 goto no_match;
112 }
113
114 /* Event loglevel. */
115 if (event->attr.loglevel != key->loglevel) {
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116 if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL
117 && key->loglevel == 0 && event->attr.loglevel == -1) {
118 /*
119 * Match is accepted. This is because on event creation, the
120 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
121 * -1 are accepted for this loglevel type since 0 is the one set by
122 * the API when receiving an enable event.
123 */
124 } else {
125 goto no_match;
126 }
18eace3b
DG
127 }
128
129 /* One of the filters is NULL, fail. */
130 if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
131 goto no_match;
132 }
133
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134 if (key->filter && event->filter) {
135 /* Both filters exists, check length followed by the bytecode. */
136 if (event->filter->len != key->filter->len ||
137 memcmp(event->filter->data, key->filter->data,
138 event->filter->len) != 0) {
139 goto no_match;
140 }
18eace3b
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141 }
142
025faf73 143 /* Match. */
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144 return 1;
145
146no_match:
147 return 0;
18eace3b
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148}
149
025faf73
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150/*
151 * Unique add of an ust app event in the given ht. This uses the custom
152 * ht_match_ust_app_event match function and the event name as hash.
153 */
d0b96690 154static void add_unique_ust_app_event(struct ust_app_channel *ua_chan,
18eace3b
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155 struct ust_app_event *event)
156{
157 struct cds_lfht_node *node_ptr;
158 struct ust_app_ht_key key;
d0b96690 159 struct lttng_ht *ht;
18eace3b 160
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161 assert(ua_chan);
162 assert(ua_chan->events);
18eace3b
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163 assert(event);
164
d0b96690 165 ht = ua_chan->events;
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166 key.name = event->attr.name;
167 key.filter = event->filter;
168 key.loglevel = event->attr.loglevel;
169
170 node_ptr = cds_lfht_add_unique(ht->ht,
171 ht->hash_fct(event->node.key, lttng_ht_seed),
172 ht_match_ust_app_event, &key, &event->node.node);
173 assert(node_ptr == &event->node.node);
174}
175
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176/*
177 * Close the notify socket from the given RCU head object. This MUST be called
178 * through a call_rcu().
179 */
180static void close_notify_sock_rcu(struct rcu_head *head)
181{
182 int ret;
183 struct ust_app_notify_sock_obj *obj =
184 caa_container_of(head, struct ust_app_notify_sock_obj, head);
185
186 /* Must have a valid fd here. */
187 assert(obj->fd >= 0);
188
189 ret = close(obj->fd);
190 if (ret) {
191 ERR("close notify sock %d RCU", obj->fd);
192 }
193 lttng_fd_put(LTTNG_FD_APPS, 1);
194
195 free(obj);
196}
197
7972aab2
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198/*
199 * Return the session registry according to the buffer type of the given
200 * session.
201 *
202 * A registry per UID object MUST exists before calling this function or else
203 * it assert() if not found. RCU read side lock must be acquired.
204 */
205static struct ust_registry_session *get_session_registry(
206 struct ust_app_session *ua_sess)
207{
208 struct ust_registry_session *registry = NULL;
209
210 assert(ua_sess);
211
212 switch (ua_sess->buffer_type) {
213 case LTTNG_BUFFER_PER_PID:
214 {
215 struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id);
216 if (!reg_pid) {
217 goto error;
218 }
219 registry = reg_pid->registry->reg.ust;
220 break;
221 }
222 case LTTNG_BUFFER_PER_UID:
223 {
224 struct buffer_reg_uid *reg_uid = buffer_reg_uid_find(
225 ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid);
226 if (!reg_uid) {
227 goto error;
228 }
229 registry = reg_uid->registry->reg.ust;
230 break;
231 }
232 default:
233 assert(0);
234 };
235
236error:
237 return registry;
238}
239
55cc08a6
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240/*
241 * Delete ust context safely. RCU read lock must be held before calling
242 * this function.
243 */
244static
245void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
246{
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247 int ret;
248
249 assert(ua_ctx);
250
55cc08a6 251 if (ua_ctx->obj) {
ffe60014 252 ret = ustctl_release_object(sock, ua_ctx->obj);
d0b96690
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253 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
254 ERR("UST app sock %d release ctx obj handle %d failed with ret %d",
255 sock, ua_ctx->obj->handle, ret);
ffe60014 256 }
55cc08a6
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257 free(ua_ctx->obj);
258 }
259 free(ua_ctx);
260}
261
d80a6244
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262/*
263 * Delete ust app event safely. RCU read lock must be held before calling
264 * this function.
265 */
8b366481
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266static
267void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
d80a6244 268{
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269 int ret;
270
271 assert(ua_event);
272
53a80697 273 free(ua_event->filter);
d80a6244 274
edb67388 275 if (ua_event->obj != NULL) {
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276 ret = ustctl_release_object(sock, ua_event->obj);
277 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
278 ERR("UST app sock %d release event obj failed with ret %d",
279 sock, ret);
280 }
edb67388
DG
281 free(ua_event->obj);
282 }
d80a6244
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283 free(ua_event);
284}
285
286/*
7972aab2
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287 * Release ust data object of the given stream.
288 *
289 * Return 0 on success or else a negative value.
d80a6244 290 */
7972aab2 291static int release_ust_app_stream(int sock, struct ust_app_stream *stream)
d80a6244 292{
7972aab2 293 int ret = 0;
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294
295 assert(stream);
296
8b366481 297 if (stream->obj) {
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298 ret = ustctl_release_object(sock, stream->obj);
299 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
300 ERR("UST app sock %d release stream obj failed with ret %d",
301 sock, ret);
302 }
4063050c 303 lttng_fd_put(LTTNG_FD_APPS, 2);
8b366481
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304 free(stream->obj);
305 }
7972aab2
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306
307 return ret;
308}
309
310/*
311 * Delete ust app stream safely. RCU read lock must be held before calling
312 * this function.
313 */
314static
315void delete_ust_app_stream(int sock, struct ust_app_stream *stream)
316{
317 assert(stream);
318
319 (void) release_ust_app_stream(sock, stream);
84cd17c6 320 free(stream);
d80a6244
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321}
322
36b588ed
MD
323/*
324 * We need to execute ht_destroy outside of RCU read-side critical
0b2dc8df
MD
325 * section and outside of call_rcu thread, so we postpone its execution
326 * using ht_cleanup_push. It is simpler than to change the semantic of
327 * the many callers of delete_ust_app_session().
36b588ed
MD
328 */
329static
330void delete_ust_app_channel_rcu(struct rcu_head *head)
331{
332 struct ust_app_channel *ua_chan =
333 caa_container_of(head, struct ust_app_channel, rcu_head);
334
0b2dc8df
MD
335 ht_cleanup_push(ua_chan->ctx);
336 ht_cleanup_push(ua_chan->events);
36b588ed
MD
337 free(ua_chan);
338}
339
d80a6244
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340/*
341 * Delete ust app channel safely. RCU read lock must be held before calling
342 * this function.
343 */
8b366481 344static
d0b96690
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345void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan,
346 struct ust_app *app)
d80a6244
DG
347{
348 int ret;
bec39940 349 struct lttng_ht_iter iter;
d80a6244 350 struct ust_app_event *ua_event;
55cc08a6 351 struct ust_app_ctx *ua_ctx;
030a66fa 352 struct ust_app_stream *stream, *stmp;
7972aab2 353 struct ust_registry_session *registry;
d80a6244 354
ffe60014
DG
355 assert(ua_chan);
356
357 DBG3("UST app deleting channel %s", ua_chan->name);
358
55cc08a6 359 /* Wipe stream */
d80a6244 360 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
84cd17c6 361 cds_list_del(&stream->list);
d80a6244
DG
362 delete_ust_app_stream(sock, stream);
363 }
364
55cc08a6 365 /* Wipe context */
bec39940 366 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
31746f93 367 cds_list_del(&ua_ctx->list);
bec39940 368 ret = lttng_ht_del(ua_chan->ctx, &iter);
55cc08a6
DG
369 assert(!ret);
370 delete_ust_app_ctx(sock, ua_ctx);
371 }
d80a6244 372
55cc08a6 373 /* Wipe events */
bec39940
DG
374 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
375 node.node) {
376 ret = lttng_ht_del(ua_chan->events, &iter);
525b0740 377 assert(!ret);
d80a6244
DG
378 delete_ust_app_event(sock, ua_event);
379 }
edb67388 380
c8335706
MD
381 if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) {
382 /* Wipe and free registry from session registry. */
383 registry = get_session_registry(ua_chan->session);
384 if (registry) {
385 ust_registry_channel_del_free(registry, ua_chan->key);
386 }
7972aab2 387 }
d0b96690 388
edb67388 389 if (ua_chan->obj != NULL) {
d0b96690
DG
390 /* Remove channel from application UST object descriptor. */
391 iter.iter.node = &ua_chan->ust_objd_node.node;
392 lttng_ht_del(app->ust_objd, &iter);
ffe60014
DG
393 ret = ustctl_release_object(sock, ua_chan->obj);
394 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
395 ERR("UST app sock %d release channel obj failed with ret %d",
396 sock, ret);
397 }
7972aab2 398 lttng_fd_put(LTTNG_FD_APPS, 1);
edb67388
DG
399 free(ua_chan->obj);
400 }
36b588ed 401 call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu);
d80a6244
DG
402}
403
331744e3 404/*
1b532a60
DG
405 * Push metadata to consumer socket.
406 *
407 * The socket lock MUST be acquired.
408 * The ust app session lock MUST be acquired.
331744e3
JD
409 *
410 * On success, return the len of metadata pushed or else a negative value.
411 */
412ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
413 struct consumer_socket *socket, int send_zero_data)
414{
415 int ret;
416 char *metadata_str = NULL;
417 size_t len, offset;
418 ssize_t ret_val;
419
420 assert(registry);
421 assert(socket);
1b532a60
DG
422
423 /*
424 * On a push metadata error either the consumer is dead or the metadata
425 * channel has been destroyed because its endpoint might have died (e.g:
426 * relayd). If so, the metadata closed flag is set to 1 so we deny pushing
427 * metadata again which is not valid anymore on the consumer side.
428 *
429 * The ust app session mutex locked allows us to make this check without
430 * the registry lock.
431 */
432 if (registry->metadata_closed) {
433 return -EPIPE;
434 }
331744e3
JD
435
436 pthread_mutex_lock(&registry->lock);
437
438 offset = registry->metadata_len_sent;
439 len = registry->metadata_len - registry->metadata_len_sent;
440 if (len == 0) {
441 DBG3("No metadata to push for metadata key %" PRIu64,
442 registry->metadata_key);
443 ret_val = len;
444 if (send_zero_data) {
445 DBG("No metadata to push");
446 goto push_data;
447 }
448 goto end;
449 }
450
451 /* Allocate only what we have to send. */
452 metadata_str = zmalloc(len);
453 if (!metadata_str) {
454 PERROR("zmalloc ust app metadata string");
455 ret_val = -ENOMEM;
456 goto error;
457 }
458 /* Copy what we haven't send out. */
459 memcpy(metadata_str, registry->metadata + offset, len);
460 registry->metadata_len_sent += len;
461
462push_data:
463 pthread_mutex_unlock(&registry->lock);
464 ret = consumer_push_metadata(socket, registry->metadata_key,
465 metadata_str, len, offset);
466 if (ret < 0) {
467 ret_val = ret;
468 goto error_push;
469 }
470
471 free(metadata_str);
472 return len;
473
474end:
475error:
476 pthread_mutex_unlock(&registry->lock);
477error_push:
478 free(metadata_str);
479 return ret_val;
480}
481
d88aee68
DG
482/*
483 * For a given application and session, push metadata to consumer. The session
484 * lock MUST be acquired here before calling this.
331744e3
JD
485 * Either sock or consumer is required : if sock is NULL, the default
486 * socket to send the metadata is retrieved from consumer, if sock
487 * is not NULL we use it to send the metadata.
d88aee68
DG
488 *
489 * Return 0 on success else a negative error.
490 */
7972aab2
DG
491static int push_metadata(struct ust_registry_session *registry,
492 struct consumer_output *consumer)
d88aee68 493{
331744e3
JD
494 int ret_val;
495 ssize_t ret;
d88aee68
DG
496 struct consumer_socket *socket;
497
7972aab2
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498 assert(registry);
499 assert(consumer);
500
501 rcu_read_lock();
d88aee68 502
7972aab2
DG
503 /*
504 * Means that no metadata was assigned to the session. This can happens if
505 * no start has been done previously.
506 */
507 if (!registry->metadata_key) {
331744e3 508 ret_val = 0;
1b532a60 509 goto end_rcu_unlock;
d88aee68
DG
510 }
511
d88aee68 512 /* Get consumer socket to use to push the metadata.*/
7972aab2
DG
513 socket = consumer_find_socket_by_bitness(registry->bits_per_long,
514 consumer);
d88aee68 515 if (!socket) {
331744e3 516 ret_val = -1;
d88aee68
DG
517 goto error_rcu_unlock;
518 }
519
520 /*
521 * TODO: Currently, we hold the socket lock around sampling of the next
522 * metadata segment to ensure we send metadata over the consumer socket in
523 * the correct order. This makes the registry lock nest inside the socket
524 * lock.
525 *
526 * Please note that this is a temporary measure: we should move this lock
527 * back into ust_consumer_push_metadata() when the consumer gets the
528 * ability to reorder the metadata it receives.
529 */
530 pthread_mutex_lock(socket->lock);
331744e3
JD
531 ret = ust_app_push_metadata(registry, socket, 0);
532 pthread_mutex_unlock(socket->lock);
d88aee68 533 if (ret < 0) {
331744e3 534 ret_val = ret;
d88aee68
DG
535 goto error_rcu_unlock;
536 }
537
d88aee68 538 rcu_read_unlock();
d88aee68
DG
539 return 0;
540
d88aee68 541error_rcu_unlock:
1b532a60
DG
542 /*
543 * On error, flag the registry that the metadata is closed. We were unable
544 * to push anything and this means that either the consumer is not
545 * responding or the metadata cache has been destroyed on the consumer.
546 */
547 registry->metadata_closed = 1;
548end_rcu_unlock:
d88aee68 549 rcu_read_unlock();
331744e3 550 return ret_val;
d88aee68
DG
551}
552
553/*
554 * Send to the consumer a close metadata command for the given session. Once
555 * done, the metadata channel is deleted and the session metadata pointer is
556 * nullified. The session lock MUST be acquired here unless the application is
557 * in the destroy path.
558 *
559 * Return 0 on success else a negative value.
560 */
7972aab2
DG
561static int close_metadata(struct ust_registry_session *registry,
562 struct consumer_output *consumer)
d88aee68
DG
563{
564 int ret;
565 struct consumer_socket *socket;
566
7972aab2
DG
567 assert(registry);
568 assert(consumer);
d88aee68 569
7972aab2
DG
570 rcu_read_lock();
571
572 if (!registry->metadata_key || registry->metadata_closed) {
d88aee68 573 ret = 0;
1b532a60 574 goto end;
d88aee68
DG
575 }
576
d88aee68 577 /* Get consumer socket to use to push the metadata.*/
7972aab2
DG
578 socket = consumer_find_socket_by_bitness(registry->bits_per_long,
579 consumer);
d88aee68
DG
580 if (!socket) {
581 ret = -1;
7972aab2 582 goto error;
d88aee68
DG
583 }
584
7972aab2 585 ret = consumer_close_metadata(socket, registry->metadata_key);
d88aee68 586 if (ret < 0) {
7972aab2 587 goto error;
d88aee68
DG
588 }
589
d88aee68 590error:
1b532a60
DG
591 /*
592 * Metadata closed. Even on error this means that the consumer is not
593 * responding or not found so either way a second close should NOT be emit
594 * for this registry.
595 */
596 registry->metadata_closed = 1;
597end:
7972aab2 598 rcu_read_unlock();
d88aee68
DG
599 return ret;
600}
601
36b588ed
MD
602/*
603 * We need to execute ht_destroy outside of RCU read-side critical
0b2dc8df
MD
604 * section and outside of call_rcu thread, so we postpone its execution
605 * using ht_cleanup_push. It is simpler than to change the semantic of
606 * the many callers of delete_ust_app_session().
36b588ed
MD
607 */
608static
609void delete_ust_app_session_rcu(struct rcu_head *head)
610{
611 struct ust_app_session *ua_sess =
612 caa_container_of(head, struct ust_app_session, rcu_head);
613
0b2dc8df 614 ht_cleanup_push(ua_sess->channels);
36b588ed
MD
615 free(ua_sess);
616}
617
d80a6244
DG
618/*
619 * Delete ust app session safely. RCU read lock must be held before calling
620 * this function.
621 */
8b366481 622static
d0b96690
DG
623void delete_ust_app_session(int sock, struct ust_app_session *ua_sess,
624 struct ust_app *app)
d80a6244
DG
625{
626 int ret;
bec39940 627 struct lttng_ht_iter iter;
d80a6244 628 struct ust_app_channel *ua_chan;
7972aab2 629 struct ust_registry_session *registry;
d80a6244 630
d88aee68
DG
631 assert(ua_sess);
632
1b532a60
DG
633 pthread_mutex_lock(&ua_sess->lock);
634
7972aab2 635 registry = get_session_registry(ua_sess);
1b532a60 636 if (registry && !registry->metadata_closed) {
d88aee68 637 /* Push metadata for application before freeing the application. */
7972aab2 638 (void) push_metadata(registry, ua_sess->consumer);
d88aee68 639
7972aab2
DG
640 /*
641 * Don't ask to close metadata for global per UID buffers. Close
1b532a60
DG
642 * metadata only on destroy trace session in this case. Also, the
643 * previous push metadata could have flag the metadata registry to
644 * close so don't send a close command if closed.
7972aab2 645 */
1b532a60
DG
646 if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID &&
647 !registry->metadata_closed) {
7972aab2
DG
648 /* And ask to close it for this session registry. */
649 (void) close_metadata(registry, ua_sess->consumer);
650 }
d80a6244
DG
651 }
652
bec39940
DG
653 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
654 node.node) {
655 ret = lttng_ht_del(ua_sess->channels, &iter);
525b0740 656 assert(!ret);
d0b96690 657 delete_ust_app_channel(sock, ua_chan, app);
d80a6244 658 }
d80a6244 659
7972aab2
DG
660 /* In case of per PID, the registry is kept in the session. */
661 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) {
662 struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id);
663 if (reg_pid) {
664 buffer_reg_pid_remove(reg_pid);
665 buffer_reg_pid_destroy(reg_pid);
666 }
667 }
d0b96690 668
aee6bafd 669 if (ua_sess->handle != -1) {
ffe60014
DG
670 ret = ustctl_release_handle(sock, ua_sess->handle);
671 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
672 ERR("UST app sock %d release session handle failed with ret %d",
673 sock, ret);
674 }
aee6bafd 675 }
1b532a60
DG
676 pthread_mutex_unlock(&ua_sess->lock);
677
36b588ed 678 call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu);
d80a6244 679}
91d76f53
DG
680
681/*
284d8f55
DG
682 * Delete a traceable application structure from the global list. Never call
683 * this function outside of a call_rcu call.
36b588ed
MD
684 *
685 * RCU read side lock should _NOT_ be held when calling this function.
91d76f53 686 */
8b366481
DG
687static
688void delete_ust_app(struct ust_app *app)
91d76f53 689{
8b366481 690 int ret, sock;
d42f20df 691 struct ust_app_session *ua_sess, *tmp_ua_sess;
44d3bd01 692
d80a6244 693 /* Delete ust app sessions info */
852d0037
DG
694 sock = app->sock;
695 app->sock = -1;
d80a6244 696
8b366481 697 /* Wipe sessions */
d42f20df
DG
698 cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head,
699 teardown_node) {
700 /* Free every object in the session and the session. */
36b588ed 701 rcu_read_lock();
d0b96690 702 delete_ust_app_session(sock, ua_sess, app);
36b588ed 703 rcu_read_unlock();
d80a6244 704 }
36b588ed 705
0b2dc8df
MD
706 ht_cleanup_push(app->sessions);
707 ht_cleanup_push(app->ust_objd);
d80a6244 708
6414a713 709 /*
852d0037
DG
710 * Wait until we have deleted the application from the sock hash table
711 * before closing this socket, otherwise an application could re-use the
712 * socket ID and race with the teardown, using the same hash table entry.
713 *
714 * It's OK to leave the close in call_rcu. We want it to stay unique for
715 * all RCU readers that could run concurrently with unregister app,
716 * therefore we _need_ to only close that socket after a grace period. So
717 * it should stay in this RCU callback.
718 *
719 * This close() is a very important step of the synchronization model so
720 * every modification to this function must be carefully reviewed.
6414a713 721 */
799e2c4f
MD
722 ret = close(sock);
723 if (ret) {
724 PERROR("close");
725 }
4063050c 726 lttng_fd_put(LTTNG_FD_APPS, 1);
d80a6244 727
852d0037 728 DBG2("UST app pid %d deleted", app->pid);
284d8f55 729 free(app);
099e26bd
DG
730}
731
732/*
f6a9efaa 733 * URCU intermediate call to delete an UST app.
099e26bd 734 */
8b366481
DG
735static
736void delete_ust_app_rcu(struct rcu_head *head)
099e26bd 737{
bec39940
DG
738 struct lttng_ht_node_ulong *node =
739 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa 740 struct ust_app *app =
852d0037 741 caa_container_of(node, struct ust_app, pid_n);
f6a9efaa 742
852d0037 743 DBG3("Call RCU deleting app PID %d", app->pid);
f6a9efaa 744 delete_ust_app(app);
099e26bd
DG
745}
746
ffe60014
DG
747/*
748 * Delete the session from the application ht and delete the data structure by
749 * freeing every object inside and releasing them.
750 */
d0b96690 751static void destroy_app_session(struct ust_app *app,
ffe60014
DG
752 struct ust_app_session *ua_sess)
753{
754 int ret;
755 struct lttng_ht_iter iter;
756
757 assert(app);
758 assert(ua_sess);
759
760 iter.iter.node = &ua_sess->node.node;
761 ret = lttng_ht_del(app->sessions, &iter);
762 if (ret) {
763 /* Already scheduled for teardown. */
764 goto end;
765 }
766
767 /* Once deleted, free the data structure. */
d0b96690 768 delete_ust_app_session(app->sock, ua_sess, app);
ffe60014
DG
769
770end:
771 return;
772}
773
8b366481
DG
774/*
775 * Alloc new UST app session.
776 */
777static
d0b96690 778struct ust_app_session *alloc_ust_app_session(struct ust_app *app)
8b366481
DG
779{
780 struct ust_app_session *ua_sess;
781
782 /* Init most of the default value by allocating and zeroing */
783 ua_sess = zmalloc(sizeof(struct ust_app_session));
784 if (ua_sess == NULL) {
785 PERROR("malloc");
ffe60014 786 goto error_free;
8b366481
DG
787 }
788
789 ua_sess->handle = -1;
bec39940 790 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
d0b96690 791 pthread_mutex_init(&ua_sess->lock, NULL);
ffe60014 792
8b366481
DG
793 return ua_sess;
794
ffe60014 795error_free:
8b366481
DG
796 return NULL;
797}
798
799/*
800 * Alloc new UST app channel.
801 */
802static
803struct ust_app_channel *alloc_ust_app_channel(char *name,
d0b96690 804 struct ust_app_session *ua_sess,
ffe60014 805 struct lttng_ust_channel_attr *attr)
8b366481
DG
806{
807 struct ust_app_channel *ua_chan;
808
809 /* Init most of the default value by allocating and zeroing */
810 ua_chan = zmalloc(sizeof(struct ust_app_channel));
811 if (ua_chan == NULL) {
812 PERROR("malloc");
813 goto error;
814 }
815
816 /* Setup channel name */
817 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
818 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
819
820 ua_chan->enabled = 1;
821 ua_chan->handle = -1;
45893984 822 ua_chan->session = ua_sess;
ffe60014 823 ua_chan->key = get_next_channel_key();
bec39940
DG
824 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
825 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
826 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
8b366481
DG
827
828 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
31746f93 829 CDS_INIT_LIST_HEAD(&ua_chan->ctx_list);
8b366481
DG
830
831 /* Copy attributes */
832 if (attr) {
ffe60014 833 /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */
2fe6e7f5
DG
834 ua_chan->attr.subbuf_size = attr->subbuf_size;
835 ua_chan->attr.num_subbuf = attr->num_subbuf;
836 ua_chan->attr.overwrite = attr->overwrite;
837 ua_chan->attr.switch_timer_interval = attr->switch_timer_interval;
838 ua_chan->attr.read_timer_interval = attr->read_timer_interval;
839 ua_chan->attr.output = attr->output;
8b366481 840 }
ffe60014
DG
841 /* By default, the channel is a per cpu channel. */
842 ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU;
8b366481
DG
843
844 DBG3("UST app channel %s allocated", ua_chan->name);
845
846 return ua_chan;
847
848error:
849 return NULL;
850}
851
37f1c236
DG
852/*
853 * Allocate and initialize a UST app stream.
854 *
855 * Return newly allocated stream pointer or NULL on error.
856 */
ffe60014 857struct ust_app_stream *ust_app_alloc_stream(void)
37f1c236
DG
858{
859 struct ust_app_stream *stream = NULL;
860
861 stream = zmalloc(sizeof(*stream));
862 if (stream == NULL) {
863 PERROR("zmalloc ust app stream");
864 goto error;
865 }
866
867 /* Zero could be a valid value for a handle so flag it to -1. */
868 stream->handle = -1;
869
870error:
871 return stream;
872}
873
8b366481
DG
874/*
875 * Alloc new UST app event.
876 */
877static
878struct ust_app_event *alloc_ust_app_event(char *name,
879 struct lttng_ust_event *attr)
880{
881 struct ust_app_event *ua_event;
882
883 /* Init most of the default value by allocating and zeroing */
884 ua_event = zmalloc(sizeof(struct ust_app_event));
885 if (ua_event == NULL) {
886 PERROR("malloc");
887 goto error;
888 }
889
890 ua_event->enabled = 1;
891 strncpy(ua_event->name, name, sizeof(ua_event->name));
892 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
bec39940 893 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
8b366481
DG
894
895 /* Copy attributes */
896 if (attr) {
897 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
898 }
899
900 DBG3("UST app event %s allocated", ua_event->name);
901
902 return ua_event;
903
904error:
905 return NULL;
906}
907
908/*
909 * Alloc new UST app context.
910 */
911static
912struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
913{
914 struct ust_app_ctx *ua_ctx;
915
916 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
917 if (ua_ctx == NULL) {
918 goto error;
919 }
920
31746f93
DG
921 CDS_INIT_LIST_HEAD(&ua_ctx->list);
922
8b366481
DG
923 if (uctx) {
924 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
925 }
926
927 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
928
929error:
930 return ua_ctx;
931}
932
025faf73
DG
933/*
934 * Allocate a filter and copy the given original filter.
935 *
936 * Return allocated filter or NULL on error.
937 */
938static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter(
939 struct lttng_ust_filter_bytecode *orig_f)
940{
941 struct lttng_ust_filter_bytecode *filter = NULL;
942
943 /* Copy filter bytecode */
944 filter = zmalloc(sizeof(*filter) + orig_f->len);
945 if (!filter) {
946 PERROR("zmalloc alloc ust app filter");
947 goto error;
948 }
949
950 memcpy(filter, orig_f, sizeof(*filter) + orig_f->len);
951
952error:
953 return filter;
954}
955
099e26bd 956/*
421cb601
DG
957 * Find an ust_app using the sock and return it. RCU read side lock must be
958 * held before calling this helper function.
099e26bd 959 */
8b366481
DG
960static
961struct ust_app *find_app_by_sock(int sock)
099e26bd 962{
bec39940 963 struct lttng_ht_node_ulong *node;
bec39940 964 struct lttng_ht_iter iter;
f6a9efaa 965
852d0037 966 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 967 node = lttng_ht_iter_get_node_ulong(&iter);
f6a9efaa
DG
968 if (node == NULL) {
969 DBG2("UST app find by sock %d not found", sock);
f6a9efaa
DG
970 goto error;
971 }
852d0037
DG
972
973 return caa_container_of(node, struct ust_app, sock_n);
f6a9efaa
DG
974
975error:
976 return NULL;
099e26bd
DG
977}
978
d0b96690
DG
979/*
980 * Find an ust_app using the notify sock and return it. RCU read side lock must
981 * be held before calling this helper function.
982 */
983static struct ust_app *find_app_by_notify_sock(int sock)
984{
985 struct lttng_ht_node_ulong *node;
986 struct lttng_ht_iter iter;
987
988 lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock),
989 &iter);
990 node = lttng_ht_iter_get_node_ulong(&iter);
991 if (node == NULL) {
992 DBG2("UST app find by notify sock %d not found", sock);
993 goto error;
994 }
995
996 return caa_container_of(node, struct ust_app, notify_sock_n);
997
998error:
999 return NULL;
1000}
1001
025faf73
DG
1002/*
1003 * Lookup for an ust app event based on event name, filter bytecode and the
1004 * event loglevel.
1005 *
1006 * Return an ust_app_event object or NULL on error.
1007 */
18eace3b
DG
1008static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht,
1009 char *name, struct lttng_ust_filter_bytecode *filter, int loglevel)
1010{
1011 struct lttng_ht_iter iter;
1012 struct lttng_ht_node_str *node;
1013 struct ust_app_event *event = NULL;
1014 struct ust_app_ht_key key;
18eace3b
DG
1015
1016 assert(name);
1017 assert(ht);
1018
1019 /* Setup key for event lookup. */
1020 key.name = name;
1021 key.filter = filter;
1022 key.loglevel = loglevel;
1023
025faf73
DG
1024 /* Lookup using the event name as hash and a custom match fct. */
1025 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
1026 ht_match_ust_app_event, &key, &iter.iter);
18eace3b
DG
1027 node = lttng_ht_iter_get_node_str(&iter);
1028 if (node == NULL) {
1029 goto end;
1030 }
1031
1032 event = caa_container_of(node, struct ust_app_event, node);
1033
1034end:
18eace3b
DG
1035 return event;
1036}
1037
55cc08a6
DG
1038/*
1039 * Create the channel context on the tracer.
d0b96690
DG
1040 *
1041 * Called with UST app session lock held.
55cc08a6
DG
1042 */
1043static
1044int create_ust_channel_context(struct ust_app_channel *ua_chan,
1045 struct ust_app_ctx *ua_ctx, struct ust_app *app)
1046{
1047 int ret;
1048
840cb59c 1049 health_code_update();
86acf0da 1050
852d0037 1051 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
55cc08a6
DG
1052 ua_chan->obj, &ua_ctx->obj);
1053 if (ret < 0) {
ffe60014
DG
1054 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1055 ERR("UST app create channel context failed for app (pid: %d) "
1056 "with ret %d", app->pid, ret);
1057 } else {
1058 DBG3("UST app disable event failed. Application is dead.");
1059 }
55cc08a6
DG
1060 goto error;
1061 }
1062
1063 ua_ctx->handle = ua_ctx->obj->handle;
1064
d0b96690
DG
1065 DBG2("UST app context handle %d created successfully for channel %s",
1066 ua_ctx->handle, ua_chan->name);
55cc08a6
DG
1067
1068error:
840cb59c 1069 health_code_update();
55cc08a6
DG
1070 return ret;
1071}
1072
53a80697
MD
1073/*
1074 * Set the filter on the tracer.
1075 */
1076static
1077int set_ust_event_filter(struct ust_app_event *ua_event,
1078 struct ust_app *app)
1079{
1080 int ret;
1081
840cb59c 1082 health_code_update();
86acf0da 1083
53a80697 1084 if (!ua_event->filter) {
86acf0da
DG
1085 ret = 0;
1086 goto error;
53a80697
MD
1087 }
1088
1089 ret = ustctl_set_filter(app->sock, ua_event->filter,
1090 ua_event->obj);
1091 if (ret < 0) {
ffe60014
DG
1092 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1093 ERR("UST app event %s filter failed for app (pid: %d) "
1094 "with ret %d", ua_event->attr.name, app->pid, ret);
1095 } else {
1096 DBG3("UST app filter event failed. Application is dead.");
1097 }
53a80697
MD
1098 goto error;
1099 }
1100
1101 DBG2("UST filter set successfully for event %s", ua_event->name);
1102
1103error:
840cb59c 1104 health_code_update();
53a80697
MD
1105 return ret;
1106}
1107
9730260e
DG
1108/*
1109 * Disable the specified event on to UST tracer for the UST session.
1110 */
1111static int disable_ust_event(struct ust_app *app,
1112 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
1113{
1114 int ret;
1115
840cb59c 1116 health_code_update();
86acf0da 1117
852d0037 1118 ret = ustctl_disable(app->sock, ua_event->obj);
9730260e 1119 if (ret < 0) {
ffe60014
DG
1120 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1121 ERR("UST app event %s disable failed for app (pid: %d) "
1122 "and session handle %d with ret %d",
1123 ua_event->attr.name, app->pid, ua_sess->handle, ret);
1124 } else {
1125 DBG3("UST app disable event failed. Application is dead.");
1126 }
9730260e
DG
1127 goto error;
1128 }
1129
1130 DBG2("UST app event %s disabled successfully for app (pid: %d)",
852d0037 1131 ua_event->attr.name, app->pid);
9730260e
DG
1132
1133error:
840cb59c 1134 health_code_update();
9730260e
DG
1135 return ret;
1136}
1137
78f0bacd
DG
1138/*
1139 * Disable the specified channel on to UST tracer for the UST session.
1140 */
1141static int disable_ust_channel(struct ust_app *app,
1142 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
1143{
1144 int ret;
1145
840cb59c 1146 health_code_update();
86acf0da 1147
852d0037 1148 ret = ustctl_disable(app->sock, ua_chan->obj);
78f0bacd 1149 if (ret < 0) {
ffe60014
DG
1150 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1151 ERR("UST app channel %s disable failed for app (pid: %d) "
1152 "and session handle %d with ret %d",
1153 ua_chan->name, app->pid, ua_sess->handle, ret);
1154 } else {
1155 DBG3("UST app disable channel failed. Application is dead.");
1156 }
78f0bacd
DG
1157 goto error;
1158 }
1159
78f0bacd 1160 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
852d0037 1161 ua_chan->name, app->pid);
78f0bacd
DG
1162
1163error:
840cb59c 1164 health_code_update();
78f0bacd
DG
1165 return ret;
1166}
1167
1168/*
1169 * Enable the specified channel on to UST tracer for the UST session.
1170 */
1171static int enable_ust_channel(struct ust_app *app,
1172 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
1173{
1174 int ret;
1175
840cb59c 1176 health_code_update();
86acf0da 1177
852d0037 1178 ret = ustctl_enable(app->sock, ua_chan->obj);
78f0bacd 1179 if (ret < 0) {
ffe60014
DG
1180 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1181 ERR("UST app channel %s enable failed for app (pid: %d) "
1182 "and session handle %d with ret %d",
1183 ua_chan->name, app->pid, ua_sess->handle, ret);
1184 } else {
1185 DBG3("UST app enable channel failed. Application is dead.");
1186 }
78f0bacd
DG
1187 goto error;
1188 }
1189
1190 ua_chan->enabled = 1;
1191
1192 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
852d0037 1193 ua_chan->name, app->pid);
78f0bacd
DG
1194
1195error:
840cb59c 1196 health_code_update();
78f0bacd
DG
1197 return ret;
1198}
1199
edb67388
DG
1200/*
1201 * Enable the specified event on to UST tracer for the UST session.
1202 */
1203static int enable_ust_event(struct ust_app *app,
1204 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
1205{
1206 int ret;
1207
840cb59c 1208 health_code_update();
86acf0da 1209
852d0037 1210 ret = ustctl_enable(app->sock, ua_event->obj);
edb67388 1211 if (ret < 0) {
ffe60014
DG
1212 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1213 ERR("UST app event %s enable failed for app (pid: %d) "
1214 "and session handle %d with ret %d",
1215 ua_event->attr.name, app->pid, ua_sess->handle, ret);
1216 } else {
1217 DBG3("UST app enable event failed. Application is dead.");
1218 }
edb67388
DG
1219 goto error;
1220 }
1221
1222 DBG2("UST app event %s enabled successfully for app (pid: %d)",
852d0037 1223 ua_event->attr.name, app->pid);
edb67388
DG
1224
1225error:
840cb59c 1226 health_code_update();
edb67388
DG
1227 return ret;
1228}
1229
099e26bd 1230/*
7972aab2 1231 * Send channel and stream buffer to application.
4f3ab6ee 1232 *
ffe60014 1233 * Return 0 on success. On error, a negative value is returned.
4f3ab6ee 1234 */
7972aab2
DG
1235static int send_channel_pid_to_ust(struct ust_app *app,
1236 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
4f3ab6ee
DG
1237{
1238 int ret;
ffe60014 1239 struct ust_app_stream *stream, *stmp;
4f3ab6ee
DG
1240
1241 assert(app);
ffe60014 1242 assert(ua_sess);
4f3ab6ee 1243 assert(ua_chan);
4f3ab6ee 1244
840cb59c 1245 health_code_update();
4f3ab6ee 1246
7972aab2
DG
1247 DBG("UST app sending channel %s to UST app sock %d", ua_chan->name,
1248 app->sock);
86acf0da 1249
ffe60014
DG
1250 /* Send channel to the application. */
1251 ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
5b4a0ec0 1252 if (ret < 0) {
b551a063
DG
1253 goto error;
1254 }
1255
d88aee68
DG
1256 health_code_update();
1257
ffe60014
DG
1258 /* Send all streams to application. */
1259 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
1260 ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream);
1261 if (ret < 0) {
1262 goto error;
1263 }
1264 /* We don't need the stream anymore once sent to the tracer. */
1265 cds_list_del(&stream->list);
1266 delete_ust_app_stream(-1, stream);
1267 }
ffe60014
DG
1268 /* Flag the channel that it is sent to the application. */
1269 ua_chan->is_sent = 1;
ffe60014 1270
b551a063 1271error:
840cb59c 1272 health_code_update();
b551a063
DG
1273 return ret;
1274}
1275
91d76f53 1276/*
5b4a0ec0 1277 * Create the specified event onto the UST tracer for a UST session.
d0b96690
DG
1278 *
1279 * Should be called with session mutex held.
91d76f53 1280 */
edb67388
DG
1281static
1282int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
1283 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
91d76f53 1284{
5b4a0ec0 1285 int ret = 0;
284d8f55 1286
840cb59c 1287 health_code_update();
86acf0da 1288
5b4a0ec0 1289 /* Create UST event on tracer */
852d0037 1290 ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
5b4a0ec0
DG
1291 &ua_event->obj);
1292 if (ret < 0) {
ffe60014
DG
1293 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1294 ERR("Error ustctl create event %s for app pid: %d with ret %d",
1295 ua_event->attr.name, app->pid, ret);
1296 } else {
1297 DBG3("UST app create event failed. Application is dead.");
1298 }
5b4a0ec0 1299 goto error;
91d76f53 1300 }
f6a9efaa 1301
5b4a0ec0 1302 ua_event->handle = ua_event->obj->handle;
284d8f55 1303
5b4a0ec0 1304 DBG2("UST app event %s created successfully for pid:%d",
852d0037 1305 ua_event->attr.name, app->pid);
f6a9efaa 1306
840cb59c 1307 health_code_update();
86acf0da 1308
025faf73
DG
1309 /* Set filter if one is present. */
1310 if (ua_event->filter) {
1311 ret = set_ust_event_filter(ua_event, app);
1312 if (ret < 0) {
1313 goto error;
1314 }
1315 }
1316
8535a6d9 1317 /* If event not enabled, disable it on the tracer */
fc34caaa 1318 if (ua_event->enabled == 0) {
8535a6d9
DG
1319 ret = disable_ust_event(app, ua_sess, ua_event);
1320 if (ret < 0) {
fc34caaa
DG
1321 /*
1322 * If we hit an EPERM, something is wrong with our disable call. If
1323 * we get an EEXIST, there is a problem on the tracer side since we
1324 * just created it.
1325 */
1326 switch (ret) {
49c336c1 1327 case -LTTNG_UST_ERR_PERM:
fc34caaa
DG
1328 /* Code flow problem */
1329 assert(0);
49c336c1 1330 case -LTTNG_UST_ERR_EXIST:
fc34caaa
DG
1331 /* It's OK for our use case. */
1332 ret = 0;
1333 break;
1334 default:
1335 break;
1336 }
8535a6d9
DG
1337 goto error;
1338 }
1339 }
1340
5b4a0ec0 1341error:
840cb59c 1342 health_code_update();
5b4a0ec0 1343 return ret;
91d76f53 1344}
48842b30 1345
5b4a0ec0
DG
1346/*
1347 * Copy data between an UST app event and a LTT event.
1348 */
421cb601 1349static void shadow_copy_event(struct ust_app_event *ua_event,
48842b30
DG
1350 struct ltt_ust_event *uevent)
1351{
1352 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
1353 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
1354
fc34caaa
DG
1355 ua_event->enabled = uevent->enabled;
1356
5b4a0ec0
DG
1357 /* Copy event attributes */
1358 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
1359
53a80697
MD
1360 /* Copy filter bytecode */
1361 if (uevent->filter) {
025faf73
DG
1362 ua_event->filter = alloc_copy_ust_app_filter(uevent->filter);
1363 /* Filter might be NULL here in case of ENONEM. */
53a80697 1364 }
48842b30
DG
1365}
1366
5b4a0ec0
DG
1367/*
1368 * Copy data between an UST app channel and a LTT channel.
1369 */
421cb601 1370static void shadow_copy_channel(struct ust_app_channel *ua_chan,
48842b30
DG
1371 struct ltt_ust_channel *uchan)
1372{
bec39940 1373 struct lttng_ht_iter iter;
48842b30 1374 struct ltt_ust_event *uevent;
55cc08a6 1375 struct ltt_ust_context *uctx;
48842b30 1376 struct ust_app_event *ua_event;
55cc08a6 1377 struct ust_app_ctx *ua_ctx;
48842b30 1378
fc34caaa 1379 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
48842b30
DG
1380
1381 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
1382 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
ffe60014 1383
1624d5b7
JD
1384 ua_chan->tracefile_size = uchan->tracefile_size;
1385 ua_chan->tracefile_count = uchan->tracefile_count;
1386
ffe60014
DG
1387 /* Copy event attributes since the layout is different. */
1388 ua_chan->attr.subbuf_size = uchan->attr.subbuf_size;
1389 ua_chan->attr.num_subbuf = uchan->attr.num_subbuf;
1390 ua_chan->attr.overwrite = uchan->attr.overwrite;
1391 ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval;
1392 ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval;
1393 ua_chan->attr.output = uchan->attr.output;
1394 /*
1395 * Note that the attribute channel type is not set since the channel on the
1396 * tracing registry side does not have this information.
1397 */
48842b30 1398
fc34caaa 1399 ua_chan->enabled = uchan->enabled;
7972aab2 1400 ua_chan->tracing_channel_id = uchan->id;
fc34caaa 1401
31746f93 1402 cds_list_for_each_entry(uctx, &uchan->ctx_list, list) {
55cc08a6
DG
1403 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
1404 if (ua_ctx == NULL) {
1405 continue;
1406 }
bec39940
DG
1407 lttng_ht_node_init_ulong(&ua_ctx->node,
1408 (unsigned long) ua_ctx->ctx.ctx);
1409 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
31746f93 1410 cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list);
55cc08a6 1411 }
48842b30 1412
421cb601 1413 /* Copy all events from ltt ust channel to ust app channel */
bec39940 1414 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
18eace3b
DG
1415 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
1416 uevent->filter, uevent->attr.loglevel);
1417 if (ua_event == NULL) {
421cb601 1418 DBG2("UST event %s not found on shadow copy channel",
48842b30 1419 uevent->attr.name);
284d8f55 1420 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
48842b30 1421 if (ua_event == NULL) {
5b4a0ec0 1422 continue;
48842b30 1423 }
421cb601 1424 shadow_copy_event(ua_event, uevent);
d0b96690 1425 add_unique_ust_app_event(ua_chan, ua_event);
48842b30 1426 }
48842b30
DG
1427 }
1428
fc34caaa 1429 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
48842b30
DG
1430}
1431
5b4a0ec0
DG
1432/*
1433 * Copy data between a UST app session and a regular LTT session.
1434 */
421cb601 1435static void shadow_copy_session(struct ust_app_session *ua_sess,
bec39940 1436 struct ltt_ust_session *usess, struct ust_app *app)
48842b30 1437{
bec39940
DG
1438 struct lttng_ht_node_str *ua_chan_node;
1439 struct lttng_ht_iter iter;
48842b30
DG
1440 struct ltt_ust_channel *uchan;
1441 struct ust_app_channel *ua_chan;
477d7741
MD
1442 time_t rawtime;
1443 struct tm *timeinfo;
1444 char datetime[16];
1445 int ret;
1446
1447 /* Get date and time for unique app path */
1448 time(&rawtime);
1449 timeinfo = localtime(&rawtime);
1450 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
48842b30 1451
421cb601 1452 DBG2("Shadow copy of session handle %d", ua_sess->handle);
48842b30 1453
7972aab2
DG
1454 ua_sess->tracing_id = usess->id;
1455 ua_sess->id = get_next_session_id();
1456 ua_sess->uid = app->uid;
1457 ua_sess->gid = app->gid;
1458 ua_sess->euid = usess->uid;
1459 ua_sess->egid = usess->gid;
1460 ua_sess->buffer_type = usess->buffer_type;
1461 ua_sess->bits_per_long = app->bits_per_long;
1462 /* There is only one consumer object per session possible. */
1463 ua_sess->consumer = usess->consumer;
2bba9e53 1464 ua_sess->output_traces = usess->output_traces;
7972aab2
DG
1465
1466 switch (ua_sess->buffer_type) {
1467 case LTTNG_BUFFER_PER_PID:
1468 ret = snprintf(ua_sess->path, sizeof(ua_sess->path),
dec56f6c 1469 DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid,
7972aab2
DG
1470 datetime);
1471 break;
1472 case LTTNG_BUFFER_PER_UID:
1473 ret = snprintf(ua_sess->path, sizeof(ua_sess->path),
1474 DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long);
1475 break;
1476 default:
1477 assert(0);
1478 goto error;
1479 }
477d7741
MD
1480 if (ret < 0) {
1481 PERROR("asprintf UST shadow copy session");
477d7741 1482 assert(0);
7972aab2 1483 goto error;
477d7741
MD
1484 }
1485
48842b30 1486 /* Iterate over all channels in global domain. */
bec39940
DG
1487 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
1488 uchan, node.node) {
1489 struct lttng_ht_iter uiter;
ba767faf 1490
bec39940
DG
1491 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1492 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
5b4a0ec0 1493 if (ua_chan_node != NULL) {
fc34caaa 1494 /* Session exist. Contiuing. */
5b4a0ec0
DG
1495 continue;
1496 }
421cb601 1497
5b4a0ec0
DG
1498 DBG2("Channel %s not found on shadow session copy, creating it",
1499 uchan->name);
d0b96690 1500 ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr);
5b4a0ec0 1501 if (ua_chan == NULL) {
fc34caaa 1502 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
5b4a0ec0 1503 continue;
48842b30 1504 }
5b4a0ec0 1505 shadow_copy_channel(ua_chan, uchan);
ffe60014
DG
1506 /*
1507 * The concept of metadata channel does not exist on the tracing
1508 * registry side of the session daemon so this can only be a per CPU
1509 * channel and not metadata.
1510 */
1511 ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU;
1512
bec39940 1513 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
48842b30 1514 }
7972aab2
DG
1515
1516error:
1517 return;
48842b30
DG
1518}
1519
78f0bacd
DG
1520/*
1521 * Lookup sesison wrapper.
1522 */
84cd17c6
MD
1523static
1524void __lookup_session_by_app(struct ltt_ust_session *usess,
bec39940 1525 struct ust_app *app, struct lttng_ht_iter *iter)
84cd17c6
MD
1526{
1527 /* Get right UST app session from app */
d9bf3ca4 1528 lttng_ht_lookup(app->sessions, &usess->id, iter);
84cd17c6
MD
1529}
1530
421cb601
DG
1531/*
1532 * Return ust app session from the app session hashtable using the UST session
a991f516 1533 * id.
421cb601 1534 */
48842b30
DG
1535static struct ust_app_session *lookup_session_by_app(
1536 struct ltt_ust_session *usess, struct ust_app *app)
1537{
bec39940 1538 struct lttng_ht_iter iter;
d9bf3ca4 1539 struct lttng_ht_node_u64 *node;
48842b30 1540
84cd17c6 1541 __lookup_session_by_app(usess, app, &iter);
d9bf3ca4 1542 node = lttng_ht_iter_get_node_u64(&iter);
48842b30
DG
1543 if (node == NULL) {
1544 goto error;
1545 }
1546
1547 return caa_container_of(node, struct ust_app_session, node);
1548
1549error:
1550 return NULL;
1551}
1552
7972aab2
DG
1553/*
1554 * Setup buffer registry per PID for the given session and application. If none
1555 * is found, a new one is created, added to the global registry and
1556 * initialized. If regp is valid, it's set with the newly created object.
1557 *
1558 * Return 0 on success or else a negative value.
1559 */
1560static int setup_buffer_reg_pid(struct ust_app_session *ua_sess,
1561 struct ust_app *app, struct buffer_reg_pid **regp)
1562{
1563 int ret = 0;
1564 struct buffer_reg_pid *reg_pid;
1565
1566 assert(ua_sess);
1567 assert(app);
1568
1569 rcu_read_lock();
1570
1571 reg_pid = buffer_reg_pid_find(ua_sess->id);
1572 if (!reg_pid) {
1573 /*
1574 * This is the create channel path meaning that if there is NO
1575 * registry available, we have to create one for this session.
1576 */
1577 ret = buffer_reg_pid_create(ua_sess->id, &reg_pid);
1578 if (ret < 0) {
1579 goto error;
1580 }
1581 buffer_reg_pid_add(reg_pid);
1582 } else {
1583 goto end;
1584 }
1585
1586 /* Initialize registry. */
1587 ret = ust_registry_session_init(&reg_pid->registry->reg.ust, app,
1588 app->bits_per_long, app->uint8_t_alignment,
1589 app->uint16_t_alignment, app->uint32_t_alignment,
af6142cf
MD
1590 app->uint64_t_alignment, app->long_alignment,
1591 app->byte_order, app->version.major,
1592 app->version.minor);
7972aab2
DG
1593 if (ret < 0) {
1594 goto error;
1595 }
1596
1597 DBG3("UST app buffer registry per PID created successfully");
1598
1599end:
1600 if (regp) {
1601 *regp = reg_pid;
1602 }
1603error:
1604 rcu_read_unlock();
1605 return ret;
1606}
1607
1608/*
1609 * Setup buffer registry per UID for the given session and application. If none
1610 * is found, a new one is created, added to the global registry and
1611 * initialized. If regp is valid, it's set with the newly created object.
1612 *
1613 * Return 0 on success or else a negative value.
1614 */
1615static int setup_buffer_reg_uid(struct ltt_ust_session *usess,
1616 struct ust_app *app, struct buffer_reg_uid **regp)
1617{
1618 int ret = 0;
1619 struct buffer_reg_uid *reg_uid;
1620
1621 assert(usess);
1622 assert(app);
1623
1624 rcu_read_lock();
1625
1626 reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid);
1627 if (!reg_uid) {
1628 /*
1629 * This is the create channel path meaning that if there is NO
1630 * registry available, we have to create one for this session.
1631 */
1632 ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid,
1633 LTTNG_DOMAIN_UST, &reg_uid);
1634 if (ret < 0) {
1635 goto error;
1636 }
1637 buffer_reg_uid_add(reg_uid);
1638 } else {
1639 goto end;
1640 }
1641
1642 /* Initialize registry. */
af6142cf 1643 ret = ust_registry_session_init(&reg_uid->registry->reg.ust, NULL,
7972aab2
DG
1644 app->bits_per_long, app->uint8_t_alignment,
1645 app->uint16_t_alignment, app->uint32_t_alignment,
af6142cf
MD
1646 app->uint64_t_alignment, app->long_alignment,
1647 app->byte_order, app->version.major,
1648 app->version.minor);
7972aab2
DG
1649 if (ret < 0) {
1650 goto error;
1651 }
1652 /* Add node to teardown list of the session. */
1653 cds_list_add(&reg_uid->lnode, &usess->buffer_reg_uid_list);
1654
1655 DBG3("UST app buffer registry per UID created successfully");
1656
1657end:
1658 if (regp) {
1659 *regp = reg_uid;
1660 }
1661error:
1662 rcu_read_unlock();
1663 return ret;
1664}
1665
421cb601 1666/*
3d8ca23b 1667 * Create a session on the tracer side for the given app.
421cb601 1668 *
3d8ca23b
DG
1669 * On success, ua_sess_ptr is populated with the session pointer or else left
1670 * untouched. If the session was created, is_created is set to 1. On error,
1671 * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can
1672 * be NULL.
1673 *
1674 * Returns 0 on success or else a negative code which is either -ENOMEM or
1675 * -ENOTCONN which is the default code if the ustctl_create_session fails.
421cb601 1676 */
3d8ca23b
DG
1677static int create_ust_app_session(struct ltt_ust_session *usess,
1678 struct ust_app *app, struct ust_app_session **ua_sess_ptr,
1679 int *is_created)
421cb601 1680{
3d8ca23b 1681 int ret, created = 0;
421cb601
DG
1682 struct ust_app_session *ua_sess;
1683
3d8ca23b
DG
1684 assert(usess);
1685 assert(app);
1686 assert(ua_sess_ptr);
1687
840cb59c 1688 health_code_update();
86acf0da 1689
421cb601
DG
1690 ua_sess = lookup_session_by_app(usess, app);
1691 if (ua_sess == NULL) {
d9bf3ca4 1692 DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it",
852d0037 1693 app->pid, usess->id);
d0b96690 1694 ua_sess = alloc_ust_app_session(app);
421cb601
DG
1695 if (ua_sess == NULL) {
1696 /* Only malloc can failed so something is really wrong */
3d8ca23b
DG
1697 ret = -ENOMEM;
1698 goto error;
421cb601 1699 }
477d7741 1700 shadow_copy_session(ua_sess, usess, app);
3d8ca23b 1701 created = 1;
421cb601
DG
1702 }
1703
7972aab2
DG
1704 switch (usess->buffer_type) {
1705 case LTTNG_BUFFER_PER_PID:
1706 /* Init local registry. */
1707 ret = setup_buffer_reg_pid(ua_sess, app, NULL);
421cb601 1708 if (ret < 0) {
7972aab2
DG
1709 goto error;
1710 }
1711 break;
1712 case LTTNG_BUFFER_PER_UID:
1713 /* Look for a global registry. If none exists, create one. */
1714 ret = setup_buffer_reg_uid(usess, app, NULL);
1715 if (ret < 0) {
1716 goto error;
1717 }
1718 break;
1719 default:
1720 assert(0);
1721 ret = -EINVAL;
1722 goto error;
1723 }
1724
1725 health_code_update();
1726
1727 if (ua_sess->handle == -1) {
1728 ret = ustctl_create_session(app->sock);
1729 if (ret < 0) {
1730 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1731 ERR("Creating session for app pid %d with ret %d",
ffe60014
DG
1732 app->pid, ret);
1733 } else {
1734 DBG("UST app creating session failed. Application is dead");
1735 }
d0b96690 1736 delete_ust_app_session(-1, ua_sess, app);
3d8ca23b
DG
1737 if (ret != -ENOMEM) {
1738 /*
1739 * Tracer is probably gone or got an internal error so let's
1740 * behave like it will soon unregister or not usable.
1741 */
1742 ret = -ENOTCONN;
1743 }
1744 goto error;
421cb601
DG
1745 }
1746
7972aab2
DG
1747 ua_sess->handle = ret;
1748
1749 /* Add ust app session to app's HT */
d9bf3ca4
MD
1750 lttng_ht_node_init_u64(&ua_sess->node,
1751 ua_sess->tracing_id);
1752 lttng_ht_add_unique_u64(app->sessions, &ua_sess->node);
7972aab2
DG
1753
1754 DBG2("UST app session created successfully with handle %d", ret);
1755 }
1756
1757 *ua_sess_ptr = ua_sess;
1758 if (is_created) {
1759 *is_created = created;
1760 }
1761
1762 /* Everything went well. */
1763 ret = 0;
1764
1765error:
1766 health_code_update();
1767 return ret;
1768}
1769
1770/*
1771 * Create a context for the channel on the tracer.
1772 *
1773 * Called with UST app session lock held and a RCU read side lock.
1774 */
1775static
1776int create_ust_app_channel_context(struct ust_app_session *ua_sess,
1777 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
1778 struct ust_app *app)
1779{
1780 int ret = 0;
1781 struct lttng_ht_iter iter;
1782 struct lttng_ht_node_ulong *node;
1783 struct ust_app_ctx *ua_ctx;
1784
1785 DBG2("UST app adding context to channel %s", ua_chan->name);
1786
1787 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1788 node = lttng_ht_iter_get_node_ulong(&iter);
1789 if (node != NULL) {
1790 ret = -EEXIST;
1791 goto error;
1792 }
1793
1794 ua_ctx = alloc_ust_app_ctx(uctx);
1795 if (ua_ctx == NULL) {
1796 /* malloc failed */
1797 ret = -1;
1798 goto error;
1799 }
1800
1801 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1802 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
31746f93 1803 cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list);
7972aab2
DG
1804
1805 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
1806 if (ret < 0) {
1807 goto error;
1808 }
1809
1810error:
1811 return ret;
1812}
1813
1814/*
1815 * Enable on the tracer side a ust app event for the session and channel.
1816 *
1817 * Called with UST app session lock held.
1818 */
1819static
1820int enable_ust_app_event(struct ust_app_session *ua_sess,
1821 struct ust_app_event *ua_event, struct ust_app *app)
1822{
1823 int ret;
1824
1825 ret = enable_ust_event(app, ua_sess, ua_event);
1826 if (ret < 0) {
1827 goto error;
1828 }
1829
1830 ua_event->enabled = 1;
1831
1832error:
1833 return ret;
1834}
1835
1836/*
1837 * Disable on the tracer side a ust app event for the session and channel.
1838 */
1839static int disable_ust_app_event(struct ust_app_session *ua_sess,
1840 struct ust_app_event *ua_event, struct ust_app *app)
1841{
1842 int ret;
1843
1844 ret = disable_ust_event(app, ua_sess, ua_event);
1845 if (ret < 0) {
1846 goto error;
1847 }
1848
1849 ua_event->enabled = 0;
1850
1851error:
1852 return ret;
1853}
1854
1855/*
1856 * Lookup ust app channel for session and disable it on the tracer side.
1857 */
1858static
1859int disable_ust_app_channel(struct ust_app_session *ua_sess,
1860 struct ust_app_channel *ua_chan, struct ust_app *app)
1861{
1862 int ret;
1863
1864 ret = disable_ust_channel(app, ua_sess, ua_chan);
1865 if (ret < 0) {
1866 goto error;
1867 }
1868
1869 ua_chan->enabled = 0;
1870
1871error:
1872 return ret;
1873}
1874
1875/*
1876 * Lookup ust app channel for session and enable it on the tracer side. This
1877 * MUST be called with a RCU read side lock acquired.
1878 */
1879static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1880 struct ltt_ust_channel *uchan, struct ust_app *app)
1881{
1882 int ret = 0;
1883 struct lttng_ht_iter iter;
1884 struct lttng_ht_node_str *ua_chan_node;
1885 struct ust_app_channel *ua_chan;
1886
1887 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1888 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1889 if (ua_chan_node == NULL) {
d9bf3ca4 1890 DBG2("Unable to find channel %s in ust session id %" PRIu64,
7972aab2
DG
1891 uchan->name, ua_sess->tracing_id);
1892 goto error;
1893 }
1894
1895 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1896
1897 ret = enable_ust_channel(app, ua_sess, ua_chan);
1898 if (ret < 0) {
1899 goto error;
1900 }
1901
1902error:
1903 return ret;
1904}
1905
1906/*
1907 * Ask the consumer to create a channel and get it if successful.
1908 *
1909 * Return 0 on success or else a negative value.
1910 */
1911static int do_consumer_create_channel(struct ltt_ust_session *usess,
1912 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan,
1913 int bitness, struct ust_registry_session *registry)
1914{
1915 int ret;
1916 unsigned int nb_fd = 0;
1917 struct consumer_socket *socket;
1918
1919 assert(usess);
1920 assert(ua_sess);
1921 assert(ua_chan);
1922 assert(registry);
1923
1924 rcu_read_lock();
1925 health_code_update();
1926
1927 /* Get the right consumer socket for the application. */
1928 socket = consumer_find_socket_by_bitness(bitness, usess->consumer);
1929 if (!socket) {
1930 ret = -EINVAL;
1931 goto error;
1932 }
1933
1934 health_code_update();
1935
1936 /* Need one fd for the channel. */
1937 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
1938 if (ret < 0) {
1939 ERR("Exhausted number of available FD upon create channel");
1940 goto error;
1941 }
1942
1943 /*
1944 * Ask consumer to create channel. The consumer will return the number of
1945 * stream we have to expect.
1946 */
1947 ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket,
1948 registry);
1949 if (ret < 0) {
1950 goto error_ask;
1951 }
1952
1953 /*
1954 * Compute the number of fd needed before receiving them. It must be 2 per
1955 * stream (2 being the default value here).
1956 */
1957 nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count;
1958
1959 /* Reserve the amount of file descriptor we need. */
1960 ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd);
1961 if (ret < 0) {
1962 ERR("Exhausted number of available FD upon create channel");
1963 goto error_fd_get_stream;
1964 }
1965
1966 health_code_update();
1967
1968 /*
1969 * Now get the channel from the consumer. This call wil populate the stream
1970 * list of that channel and set the ust objects.
1971 */
d9078d0c
DG
1972 if (usess->consumer->enabled) {
1973 ret = ust_consumer_get_channel(socket, ua_chan);
1974 if (ret < 0) {
1975 goto error_destroy;
1976 }
7972aab2
DG
1977 }
1978
1979 rcu_read_unlock();
1980 return 0;
1981
1982error_destroy:
1983 lttng_fd_put(LTTNG_FD_APPS, nb_fd);
1984error_fd_get_stream:
1985 /*
1986 * Initiate a destroy channel on the consumer since we had an error
1987 * handling it on our side. The return value is of no importance since we
1988 * already have a ret value set by the previous error that we need to
1989 * return.
1990 */
1991 (void) ust_consumer_destroy_channel(socket, ua_chan);
1992error_ask:
1993 lttng_fd_put(LTTNG_FD_APPS, 1);
1994error:
1995 health_code_update();
1996 rcu_read_unlock();
1997 return ret;
1998}
1999
2000/*
2001 * Duplicate the ust data object of the ust app stream and save it in the
2002 * buffer registry stream.
2003 *
2004 * Return 0 on success or else a negative value.
2005 */
2006static int duplicate_stream_object(struct buffer_reg_stream *reg_stream,
2007 struct ust_app_stream *stream)
2008{
2009 int ret;
2010
2011 assert(reg_stream);
2012 assert(stream);
2013
2014 /* Reserve the amount of file descriptor we need. */
2015 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2016 if (ret < 0) {
2017 ERR("Exhausted number of available FD upon duplicate stream");
2018 goto error;
2019 }
2020
2021 /* Duplicate object for stream once the original is in the registry. */
2022 ret = ustctl_duplicate_ust_object_data(&stream->obj,
2023 reg_stream->obj.ust);
2024 if (ret < 0) {
2025 ERR("Duplicate stream obj from %p to %p failed with ret %d",
2026 reg_stream->obj.ust, stream->obj, ret);
2027 lttng_fd_put(LTTNG_FD_APPS, 2);
2028 goto error;
2029 }
2030 stream->handle = stream->obj->handle;
2031
2032error:
2033 return ret;
2034}
2035
2036/*
2037 * Duplicate the ust data object of the ust app. channel and save it in the
2038 * buffer registry channel.
2039 *
2040 * Return 0 on success or else a negative value.
2041 */
2042static int duplicate_channel_object(struct buffer_reg_channel *reg_chan,
2043 struct ust_app_channel *ua_chan)
2044{
2045 int ret;
2046
2047 assert(reg_chan);
2048 assert(ua_chan);
2049
2050 /* Need two fds for the channel. */
2051 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2052 if (ret < 0) {
2053 ERR("Exhausted number of available FD upon duplicate channel");
2054 goto error_fd_get;
2055 }
2056
2057 /* Duplicate object for stream once the original is in the registry. */
2058 ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust);
2059 if (ret < 0) {
2060 ERR("Duplicate channel obj from %p to %p failed with ret: %d",
2061 reg_chan->obj.ust, ua_chan->obj, ret);
2062 goto error;
2063 }
2064 ua_chan->handle = ua_chan->obj->handle;
2065
2066 return 0;
2067
2068error:
2069 lttng_fd_put(LTTNG_FD_APPS, 1);
2070error_fd_get:
2071 return ret;
2072}
2073
2074/*
2075 * For a given channel buffer registry, setup all streams of the given ust
2076 * application channel.
2077 *
2078 * Return 0 on success or else a negative value.
2079 */
2080static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan,
2081 struct ust_app_channel *ua_chan)
2082{
2083 int ret = 0;
2084 struct ust_app_stream *stream, *stmp;
2085
2086 assert(reg_chan);
2087 assert(ua_chan);
2088
2089 DBG2("UST app setup buffer registry stream");
2090
2091 /* Send all streams to application. */
2092 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
2093 struct buffer_reg_stream *reg_stream;
2094
2095 ret = buffer_reg_stream_create(&reg_stream);
2096 if (ret < 0) {
2097 goto error;
2098 }
2099
2100 /*
2101 * Keep original pointer and nullify it in the stream so the delete
2102 * stream call does not release the object.
2103 */
2104 reg_stream->obj.ust = stream->obj;
2105 stream->obj = NULL;
2106 buffer_reg_stream_add(reg_stream, reg_chan);
421cb601 2107
7972aab2
DG
2108 /* We don't need the streams anymore. */
2109 cds_list_del(&stream->list);
2110 delete_ust_app_stream(-1, stream);
2111 }
421cb601 2112
7972aab2
DG
2113error:
2114 return ret;
2115}
2116
2117/*
2118 * Create a buffer registry channel for the given session registry and
2119 * application channel object. If regp pointer is valid, it's set with the
2120 * created object. Important, the created object is NOT added to the session
2121 * registry hash table.
2122 *
2123 * Return 0 on success else a negative value.
2124 */
2125static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess,
2126 struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp)
2127{
2128 int ret;
2129 struct buffer_reg_channel *reg_chan = NULL;
2130
2131 assert(reg_sess);
2132 assert(ua_chan);
2133
2134 DBG2("UST app creating buffer registry channel for %s", ua_chan->name);
2135
2136 /* Create buffer registry channel. */
2137 ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, &reg_chan);
2138 if (ret < 0) {
2139 goto error_create;
421cb601 2140 }
7972aab2
DG
2141 assert(reg_chan);
2142 reg_chan->consumer_key = ua_chan->key;
8c924c7b 2143 reg_chan->subbuf_size = ua_chan->attr.subbuf_size;
421cb601 2144
7972aab2
DG
2145 /* Create and add a channel registry to session. */
2146 ret = ust_registry_channel_add(reg_sess->reg.ust,
2147 ua_chan->tracing_channel_id);
2148 if (ret < 0) {
2149 goto error;
d88aee68 2150 }
7972aab2 2151 buffer_reg_channel_add(reg_sess, reg_chan);
d88aee68 2152
7972aab2
DG
2153 if (regp) {
2154 *regp = reg_chan;
3d8ca23b 2155 }
d88aee68 2156
7972aab2 2157 return 0;
3d8ca23b
DG
2158
2159error:
7972aab2
DG
2160 /* Safe because the registry channel object was not added to any HT. */
2161 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
2162error_create:
3d8ca23b 2163 return ret;
421cb601
DG
2164}
2165
55cc08a6 2166/*
7972aab2
DG
2167 * Setup buffer registry channel for the given session registry and application
2168 * channel object. If regp pointer is valid, it's set with the created object.
d0b96690 2169 *
7972aab2 2170 * Return 0 on success else a negative value.
55cc08a6 2171 */
7972aab2
DG
2172static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess,
2173 struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan)
55cc08a6 2174{
7972aab2 2175 int ret;
55cc08a6 2176
7972aab2
DG
2177 assert(reg_sess);
2178 assert(reg_chan);
2179 assert(ua_chan);
2180 assert(ua_chan->obj);
55cc08a6 2181
7972aab2 2182 DBG2("UST app setup buffer registry channel for %s", ua_chan->name);
55cc08a6 2183
7972aab2
DG
2184 /* Setup all streams for the registry. */
2185 ret = setup_buffer_reg_streams(reg_chan, ua_chan);
2186 if (ret < 0) {
55cc08a6
DG
2187 goto error;
2188 }
2189
7972aab2
DG
2190 reg_chan->obj.ust = ua_chan->obj;
2191 ua_chan->obj = NULL;
55cc08a6 2192
7972aab2 2193 return 0;
55cc08a6
DG
2194
2195error:
7972aab2
DG
2196 buffer_reg_channel_remove(reg_sess, reg_chan);
2197 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
55cc08a6
DG
2198 return ret;
2199}
2200
edb67388 2201/*
7972aab2 2202 * Send buffer registry channel to the application.
d0b96690 2203 *
7972aab2 2204 * Return 0 on success else a negative value.
edb67388 2205 */
7972aab2
DG
2206static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan,
2207 struct ust_app *app, struct ust_app_session *ua_sess,
2208 struct ust_app_channel *ua_chan)
edb67388
DG
2209{
2210 int ret;
7972aab2 2211 struct buffer_reg_stream *reg_stream;
edb67388 2212
7972aab2
DG
2213 assert(reg_chan);
2214 assert(app);
2215 assert(ua_sess);
2216 assert(ua_chan);
2217
2218 DBG("UST app sending buffer registry channel to ust sock %d", app->sock);
2219
2220 ret = duplicate_channel_object(reg_chan, ua_chan);
edb67388
DG
2221 if (ret < 0) {
2222 goto error;
2223 }
2224
7972aab2
DG
2225 /* Send channel to the application. */
2226 ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
2227 if (ret < 0) {
2228 goto error;
2229 }
2230
2231 health_code_update();
2232
2233 /* Send all streams to application. */
2234 pthread_mutex_lock(&reg_chan->stream_list_lock);
2235 cds_list_for_each_entry(reg_stream, &reg_chan->streams, lnode) {
2236 struct ust_app_stream stream;
2237
2238 ret = duplicate_stream_object(reg_stream, &stream);
2239 if (ret < 0) {
2240 goto error_stream_unlock;
2241 }
2242
2243 ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream);
2244 if (ret < 0) {
8c067051 2245 (void) release_ust_app_stream(-1, &stream);
7972aab2
DG
2246 goto error_stream_unlock;
2247 }
edb67388 2248
7972aab2
DG
2249 /*
2250 * The return value is not important here. This function will output an
2251 * error if needed.
2252 */
2253 (void) release_ust_app_stream(-1, &stream);
2254 }
2255 ua_chan->is_sent = 1;
2256
2257error_stream_unlock:
2258 pthread_mutex_unlock(&reg_chan->stream_list_lock);
edb67388
DG
2259error:
2260 return ret;
2261}
2262
9730260e 2263/*
7972aab2
DG
2264 * Create and send to the application the created buffers with per UID buffers.
2265 *
2266 * Return 0 on success else a negative value.
9730260e 2267 */
7972aab2
DG
2268static int create_channel_per_uid(struct ust_app *app,
2269 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2270 struct ust_app_channel *ua_chan)
9730260e
DG
2271{
2272 int ret;
7972aab2
DG
2273 struct buffer_reg_uid *reg_uid;
2274 struct buffer_reg_channel *reg_chan;
9730260e 2275
7972aab2
DG
2276 assert(app);
2277 assert(usess);
2278 assert(ua_sess);
2279 assert(ua_chan);
2280
2281 DBG("UST app creating channel %s with per UID buffers", ua_chan->name);
2282
2283 reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid);
2284 /*
2285 * The session creation handles the creation of this global registry
2286 * object. If none can be find, there is a code flow problem or a
2287 * teardown race.
2288 */
2289 assert(reg_uid);
2290
2291 reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id,
2292 reg_uid);
2293 if (!reg_chan) {
2294 /* Create the buffer registry channel object. */
2295 ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, &reg_chan);
2296 if (ret < 0) {
2297 goto error;
2298 }
2299 assert(reg_chan);
2300
2301 /*
2302 * Create the buffers on the consumer side. This call populates the
2303 * ust app channel object with all streams and data object.
2304 */
2305 ret = do_consumer_create_channel(usess, ua_sess, ua_chan,
2306 app->bits_per_long, reg_uid->registry->reg.ust);
2307 if (ret < 0) {
07d2ae95
DG
2308 /*
2309 * Let's remove the previously created buffer registry channel so
2310 * it's not visible anymore in the session registry.
2311 */
2312 ust_registry_channel_del_free(reg_uid->registry->reg.ust,
2313 ua_chan->tracing_channel_id);
2314 buffer_reg_channel_remove(reg_uid->registry, reg_chan);
2315 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
7972aab2
DG
2316 goto error;
2317 }
2318
2319 /*
2320 * Setup the streams and add it to the session registry.
2321 */
2322 ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan);
2323 if (ret < 0) {
2324 goto error;
2325 }
2326
2327 }
2328
2329 /* Send buffers to the application. */
2330 ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan);
9730260e
DG
2331 if (ret < 0) {
2332 goto error;
2333 }
2334
9730260e
DG
2335error:
2336 return ret;
2337}
2338
78f0bacd 2339/*
7972aab2
DG
2340 * Create and send to the application the created buffers with per PID buffers.
2341 *
2342 * Return 0 on success else a negative value.
78f0bacd 2343 */
7972aab2
DG
2344static int create_channel_per_pid(struct ust_app *app,
2345 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2346 struct ust_app_channel *ua_chan)
78f0bacd 2347{
8535a6d9 2348 int ret;
7972aab2 2349 struct ust_registry_session *registry;
78f0bacd 2350
7972aab2
DG
2351 assert(app);
2352 assert(usess);
2353 assert(ua_sess);
2354 assert(ua_chan);
2355
2356 DBG("UST app creating channel %s with per PID buffers", ua_chan->name);
2357
2358 rcu_read_lock();
2359
2360 registry = get_session_registry(ua_sess);
2361 assert(registry);
2362
2363 /* Create and add a new channel registry to session. */
2364 ret = ust_registry_channel_add(registry, ua_chan->key);
78f0bacd
DG
2365 if (ret < 0) {
2366 goto error;
2367 }
2368
7972aab2
DG
2369 /* Create and get channel on the consumer side. */
2370 ret = do_consumer_create_channel(usess, ua_sess, ua_chan,
2371 app->bits_per_long, registry);
2372 if (ret < 0) {
2373 goto error;
2374 }
2375
2376 ret = send_channel_pid_to_ust(app, ua_sess, ua_chan);
2377 if (ret < 0) {
2378 goto error;
2379 }
8535a6d9 2380
78f0bacd 2381error:
7972aab2 2382 rcu_read_unlock();
78f0bacd
DG
2383 return ret;
2384}
2385
2386/*
7972aab2
DG
2387 * From an already allocated ust app channel, create the channel buffers if
2388 * need and send it to the application. This MUST be called with a RCU read
2389 * side lock acquired.
2390 *
2391 * Return 0 on success or else a negative value.
78f0bacd 2392 */
7972aab2
DG
2393static int do_create_channel(struct ust_app *app,
2394 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2395 struct ust_app_channel *ua_chan)
78f0bacd 2396{
7972aab2 2397 int ret;
78f0bacd 2398
7972aab2
DG
2399 assert(app);
2400 assert(usess);
2401 assert(ua_sess);
2402 assert(ua_chan);
2403
2404 /* Handle buffer type before sending the channel to the application. */
2405 switch (usess->buffer_type) {
2406 case LTTNG_BUFFER_PER_UID:
2407 {
2408 ret = create_channel_per_uid(app, usess, ua_sess, ua_chan);
2409 if (ret < 0) {
2410 goto error;
2411 }
2412 break;
2413 }
2414 case LTTNG_BUFFER_PER_PID:
2415 {
2416 ret = create_channel_per_pid(app, usess, ua_sess, ua_chan);
2417 if (ret < 0) {
2418 goto error;
2419 }
2420 break;
2421 }
2422 default:
2423 assert(0);
2424 ret = -EINVAL;
78f0bacd
DG
2425 goto error;
2426 }
2427
7972aab2
DG
2428 /* Initialize ust objd object using the received handle and add it. */
2429 lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle);
2430 lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node);
78f0bacd 2431
7972aab2
DG
2432 /* If channel is not enabled, disable it on the tracer */
2433 if (!ua_chan->enabled) {
2434 ret = disable_ust_channel(app, ua_sess, ua_chan);
2435 if (ret < 0) {
2436 goto error;
2437 }
78f0bacd
DG
2438 }
2439
2440error:
2441 return ret;
2442}
2443
284d8f55 2444/*
4d710ac2
DG
2445 * Create UST app channel and create it on the tracer. Set ua_chanp of the
2446 * newly created channel if not NULL.
d0b96690 2447 *
36b588ed 2448 * Called with UST app session lock and RCU read-side lock held.
7972aab2
DG
2449 *
2450 * Return 0 on success or else a negative value.
284d8f55 2451 */
4d710ac2
DG
2452static int create_ust_app_channel(struct ust_app_session *ua_sess,
2453 struct ltt_ust_channel *uchan, struct ust_app *app,
7972aab2 2454 enum lttng_ust_chan_type type, struct ltt_ust_session *usess,
4d710ac2 2455 struct ust_app_channel **ua_chanp)
5b4a0ec0
DG
2456{
2457 int ret = 0;
bec39940
DG
2458 struct lttng_ht_iter iter;
2459 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
2460 struct ust_app_channel *ua_chan;
2461
2462 /* Lookup channel in the ust app session */
bec39940
DG
2463 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2464 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
fc34caaa 2465 if (ua_chan_node != NULL) {
5b4a0ec0 2466 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
fc34caaa 2467 goto end;
5b4a0ec0
DG
2468 }
2469
d0b96690 2470 ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr);
fc34caaa
DG
2471 if (ua_chan == NULL) {
2472 /* Only malloc can fail here */
4d710ac2 2473 ret = -ENOMEM;
094d1690 2474 goto error_alloc;
fc34caaa
DG
2475 }
2476 shadow_copy_channel(ua_chan, uchan);
2477
ffe60014
DG
2478 /* Set channel type. */
2479 ua_chan->attr.type = type;
2480
7972aab2 2481 ret = do_create_channel(app, usess, ua_sess, ua_chan);
5b4a0ec0
DG
2482 if (ret < 0) {
2483 goto error;
2484 }
2485
fc34caaa 2486 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
852d0037 2487 app->pid);
fc34caaa 2488
d0b96690
DG
2489 /* Only add the channel if successful on the tracer side. */
2490 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
2491
fc34caaa 2492end:
4d710ac2
DG
2493 if (ua_chanp) {
2494 *ua_chanp = ua_chan;
2495 }
2496
2497 /* Everything went well. */
2498 return 0;
5b4a0ec0
DG
2499
2500error:
d0b96690 2501 delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app);
094d1690 2502error_alloc:
4d710ac2 2503 return ret;
5b4a0ec0
DG
2504}
2505
2506/*
2507 * Create UST app event and create it on the tracer side.
d0b96690
DG
2508 *
2509 * Called with ust app session mutex held.
5b4a0ec0 2510 */
edb67388
DG
2511static
2512int create_ust_app_event(struct ust_app_session *ua_sess,
2513 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
2514 struct ust_app *app)
284d8f55 2515{
edb67388 2516 int ret = 0;
5b4a0ec0 2517 struct ust_app_event *ua_event;
284d8f55 2518
5b4a0ec0 2519 /* Get event node */
18eace3b
DG
2520 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
2521 uevent->filter, uevent->attr.loglevel);
2522 if (ua_event != NULL) {
fc34caaa 2523 ret = -EEXIST;
edb67388
DG
2524 goto end;
2525 }
5b4a0ec0 2526
edb67388
DG
2527 /* Does not exist so create one */
2528 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
2529 if (ua_event == NULL) {
2530 /* Only malloc can failed so something is really wrong */
2531 ret = -ENOMEM;
fc34caaa 2532 goto end;
5b4a0ec0 2533 }
edb67388 2534 shadow_copy_event(ua_event, uevent);
5b4a0ec0 2535
edb67388 2536 /* Create it on the tracer side */
5b4a0ec0 2537 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 2538 if (ret < 0) {
fc34caaa 2539 /* Not found previously means that it does not exist on the tracer */
76f66f63 2540 assert(ret != -LTTNG_UST_ERR_EXIST);
284d8f55
DG
2541 goto error;
2542 }
2543
d0b96690 2544 add_unique_ust_app_event(ua_chan, ua_event);
284d8f55 2545
fc34caaa 2546 DBG2("UST app create event %s for PID %d completed", ua_event->name,
852d0037 2547 app->pid);
7f79d3a1 2548
edb67388 2549end:
fc34caaa
DG
2550 return ret;
2551
5b4a0ec0 2552error:
fc34caaa
DG
2553 /* Valid. Calling here is already in a read side lock */
2554 delete_ust_app_event(-1, ua_event);
edb67388 2555 return ret;
5b4a0ec0
DG
2556}
2557
2558/*
2559 * Create UST metadata and open it on the tracer side.
d0b96690 2560 *
7972aab2 2561 * Called with UST app session lock held and RCU read side lock.
5b4a0ec0
DG
2562 */
2563static int create_ust_app_metadata(struct ust_app_session *ua_sess,
d65d2de8
DG
2564 struct ust_app *app, struct consumer_output *consumer,
2565 struct ustctl_consumer_channel_attr *attr)
5b4a0ec0
DG
2566{
2567 int ret = 0;
ffe60014 2568 struct ust_app_channel *metadata;
d88aee68 2569 struct consumer_socket *socket;
7972aab2 2570 struct ust_registry_session *registry;
5b4a0ec0 2571
ffe60014
DG
2572 assert(ua_sess);
2573 assert(app);
d88aee68 2574 assert(consumer);
5b4a0ec0 2575
7972aab2
DG
2576 registry = get_session_registry(ua_sess);
2577 assert(registry);
2578
1b532a60
DG
2579 /* Metadata already exists for this registry or it was closed previously */
2580 if (registry->metadata_key || registry->metadata_closed) {
7972aab2
DG
2581 ret = 0;
2582 goto error;
5b4a0ec0
DG
2583 }
2584
ffe60014 2585 /* Allocate UST metadata */
d0b96690 2586 metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL);
ffe60014
DG
2587 if (!metadata) {
2588 /* malloc() failed */
2589 ret = -ENOMEM;
2590 goto error;
2591 }
5b4a0ec0 2592
d65d2de8
DG
2593 if (!attr) {
2594 /* Set default attributes for metadata. */
2595 metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
2596 metadata->attr.subbuf_size = default_get_metadata_subbuf_size();
2597 metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
0a9c6494
DG
2598 metadata->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER;
2599 metadata->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER;
d65d2de8
DG
2600 metadata->attr.output = LTTNG_UST_MMAP;
2601 metadata->attr.type = LTTNG_UST_CHAN_METADATA;
2602 } else {
2603 memcpy(&metadata->attr, attr, sizeof(metadata->attr));
2604 metadata->attr.output = LTTNG_UST_MMAP;
2605 metadata->attr.type = LTTNG_UST_CHAN_METADATA;
2606 }
5b4a0ec0 2607
7972aab2
DG
2608 /* Need one fd for the channel. */
2609 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2610 if (ret < 0) {
2611 ERR("Exhausted number of available FD upon create metadata");
2612 goto error;
2613 }
2614
4dc3dfc5
DG
2615 /* Get the right consumer socket for the application. */
2616 socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer);
2617 if (!socket) {
2618 ret = -EINVAL;
2619 goto error_consumer;
2620 }
2621
331744e3
JD
2622 /*
2623 * Keep metadata key so we can identify it on the consumer side. Assign it
2624 * to the registry *before* we ask the consumer so we avoid the race of the
2625 * consumer requesting the metadata and the ask_channel call on our side
2626 * did not returned yet.
2627 */
2628 registry->metadata_key = metadata->key;
2629
d88aee68
DG
2630 /*
2631 * Ask the metadata channel creation to the consumer. The metadata object
2632 * will be created by the consumer and kept their. However, the stream is
2633 * never added or monitored until we do a first push metadata to the
2634 * consumer.
2635 */
7972aab2
DG
2636 ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket,
2637 registry);
d88aee68 2638 if (ret < 0) {
f2a444f1
DG
2639 /* Nullify the metadata key so we don't try to close it later on. */
2640 registry->metadata_key = 0;
d88aee68
DG
2641 goto error_consumer;
2642 }
2643
2644 /*
2645 * The setup command will make the metadata stream be sent to the relayd,
2646 * if applicable, and the thread managing the metadatas. This is important
2647 * because after this point, if an error occurs, the only way the stream
2648 * can be deleted is to be monitored in the consumer.
2649 */
7972aab2 2650 ret = consumer_setup_metadata(socket, metadata->key);
ffe60014 2651 if (ret < 0) {
f2a444f1
DG
2652 /* Nullify the metadata key so we don't try to close it later on. */
2653 registry->metadata_key = 0;
d88aee68 2654 goto error_consumer;
5b4a0ec0
DG
2655 }
2656
7972aab2
DG
2657 DBG2("UST metadata with key %" PRIu64 " created for app pid %d",
2658 metadata->key, app->pid);
5b4a0ec0 2659
d88aee68 2660error_consumer:
b80f0b6c 2661 lttng_fd_put(LTTNG_FD_APPS, 1);
d88aee68 2662 delete_ust_app_channel(-1, metadata, app);
5b4a0ec0 2663error:
ffe60014 2664 return ret;
5b4a0ec0
DG
2665}
2666
2667/*
2668 * Return pointer to traceable apps list.
2669 */
bec39940 2670struct lttng_ht *ust_app_get_ht(void)
5b4a0ec0
DG
2671{
2672 return ust_app_ht;
2673}
2674
2675/*
d88aee68
DG
2676 * Return ust app pointer or NULL if not found. RCU read side lock MUST be
2677 * acquired before calling this function.
5b4a0ec0
DG
2678 */
2679struct ust_app *ust_app_find_by_pid(pid_t pid)
2680{
d88aee68 2681 struct ust_app *app = NULL;
bec39940
DG
2682 struct lttng_ht_node_ulong *node;
2683 struct lttng_ht_iter iter;
5b4a0ec0 2684
bec39940
DG
2685 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
2686 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
2687 if (node == NULL) {
2688 DBG2("UST app no found with pid %d", pid);
2689 goto error;
2690 }
5b4a0ec0
DG
2691
2692 DBG2("Found UST app by pid %d", pid);
2693
d88aee68 2694 app = caa_container_of(node, struct ust_app, pid_n);
5b4a0ec0
DG
2695
2696error:
d88aee68 2697 return app;
5b4a0ec0
DG
2698}
2699
d88aee68
DG
2700/*
2701 * Allocate and init an UST app object using the registration information and
2702 * the command socket. This is called when the command socket connects to the
2703 * session daemon.
2704 *
2705 * The object is returned on success or else NULL.
2706 */
d0b96690 2707struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock)
5b4a0ec0 2708{
d0b96690
DG
2709 struct ust_app *lta = NULL;
2710
2711 assert(msg);
2712 assert(sock >= 0);
2713
2714 DBG3("UST app creating application for socket %d", sock);
5b4a0ec0 2715
173af62f
DG
2716 if ((msg->bits_per_long == 64 &&
2717 (uatomic_read(&ust_consumerd64_fd) == -EINVAL))
2718 || (msg->bits_per_long == 32 &&
2719 (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) {
f943b0fb 2720 ERR("Registration failed: application \"%s\" (pid: %d) has "
d0b96690
DG
2721 "%d-bit long, but no consumerd for this size is available.\n",
2722 msg->name, msg->pid, msg->bits_per_long);
2723 goto error;
3f2c5fcc 2724 }
d0b96690 2725
5b4a0ec0
DG
2726 lta = zmalloc(sizeof(struct ust_app));
2727 if (lta == NULL) {
2728 PERROR("malloc");
d0b96690 2729 goto error;
5b4a0ec0
DG
2730 }
2731
2732 lta->ppid = msg->ppid;
2733 lta->uid = msg->uid;
2734 lta->gid = msg->gid;
d0b96690 2735
7753dea8 2736 lta->bits_per_long = msg->bits_per_long;
d0b96690
DG
2737 lta->uint8_t_alignment = msg->uint8_t_alignment;
2738 lta->uint16_t_alignment = msg->uint16_t_alignment;
2739 lta->uint32_t_alignment = msg->uint32_t_alignment;
2740 lta->uint64_t_alignment = msg->uint64_t_alignment;
2741 lta->long_alignment = msg->long_alignment;
2742 lta->byte_order = msg->byte_order;
2743
5b4a0ec0
DG
2744 lta->v_major = msg->major;
2745 lta->v_minor = msg->minor;
d9bf3ca4 2746 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
d0b96690
DG
2747 lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
2748 lta->notify_sock = -1;
d88aee68
DG
2749
2750 /* Copy name and make sure it's NULL terminated. */
2751 strncpy(lta->name, msg->name, sizeof(lta->name));
2752 lta->name[UST_APP_PROCNAME_LEN] = '\0';
2753
2754 /*
2755 * Before this can be called, when receiving the registration information,
2756 * the application compatibility is checked. So, at this point, the
2757 * application can work with this session daemon.
2758 */
d0b96690 2759 lta->compatible = 1;
5b4a0ec0 2760
852d0037 2761 lta->pid = msg->pid;
d0b96690 2762 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long) lta->pid);
852d0037 2763 lta->sock = sock;
d0b96690 2764 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long) lta->sock);
5b4a0ec0 2765
d42f20df
DG
2766 CDS_INIT_LIST_HEAD(&lta->teardown_head);
2767
d0b96690
DG
2768error:
2769 return lta;
2770}
2771
d88aee68
DG
2772/*
2773 * For a given application object, add it to every hash table.
2774 */
d0b96690
DG
2775void ust_app_add(struct ust_app *app)
2776{
2777 assert(app);
2778 assert(app->notify_sock >= 0);
2779
5b4a0ec0 2780 rcu_read_lock();
852d0037
DG
2781
2782 /*
2783 * On a re-registration, we want to kick out the previous registration of
2784 * that pid
2785 */
d0b96690 2786 lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n);
852d0037
DG
2787
2788 /*
2789 * The socket _should_ be unique until _we_ call close. So, a add_unique
2790 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
2791 * already in the table.
2792 */
d0b96690 2793 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n);
852d0037 2794
d0b96690
DG
2795 /* Add application to the notify socket hash table. */
2796 lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock);
2797 lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n);
5b4a0ec0 2798
d0b96690 2799 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s "
d88aee68
DG
2800 "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid,
2801 app->gid, app->sock, app->name, app->notify_sock, app->v_major,
2802 app->v_minor);
5b4a0ec0 2803
d0b96690
DG
2804 rcu_read_unlock();
2805}
2806
d88aee68
DG
2807/*
2808 * Set the application version into the object.
2809 *
2810 * Return 0 on success else a negative value either an errno code or a
2811 * LTTng-UST error code.
2812 */
d0b96690
DG
2813int ust_app_version(struct ust_app *app)
2814{
d88aee68
DG
2815 int ret;
2816
d0b96690 2817 assert(app);
d88aee68
DG
2818
2819 ret = ustctl_tracer_version(app->sock, &app->version);
2820 if (ret < 0) {
2821 if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
2822 ERR("UST app %d verson failed with ret %d", app->sock, ret);
2823 } else {
2824 DBG3("UST app %d verion failed. Application is dead", app->sock);
2825 }
2826 }
2827
2828 return ret;
5b4a0ec0
DG
2829}
2830
2831/*
2832 * Unregister app by removing it from the global traceable app list and freeing
2833 * the data struct.
2834 *
2835 * The socket is already closed at this point so no close to sock.
2836 */
2837void ust_app_unregister(int sock)
2838{
2839 struct ust_app *lta;
bec39940
DG
2840 struct lttng_ht_node_ulong *node;
2841 struct lttng_ht_iter iter;
d42f20df 2842 struct ust_app_session *ua_sess;
525b0740 2843 int ret;
5b4a0ec0
DG
2844
2845 rcu_read_lock();
886459c6 2846
5b4a0ec0 2847 /* Get the node reference for a call_rcu */
852d0037 2848 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 2849 node = lttng_ht_iter_get_node_ulong(&iter);
d0b96690 2850 assert(node);
284d8f55 2851
852d0037 2852 lta = caa_container_of(node, struct ust_app, sock_n);
852d0037
DG
2853 DBG("PID %d unregistering with sock %d", lta->pid, sock);
2854
886459c6 2855 /* Remove application from PID hash table */
852d0037
DG
2856 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
2857 assert(!ret);
2858
d88aee68
DG
2859 /*
2860 * Remove application from notify hash table. The thread handling the
2861 * notify socket could have deleted the node so ignore on error because
2862 * either way it's valid. The close of that socket is handled by the other
2863 * thread.
2864 */
d0b96690 2865 iter.iter.node = &lta->notify_sock_n.node;
d88aee68 2866 (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
852d0037 2867
5b98a774
DG
2868 /*
2869 * Ignore return value since the node might have been removed before by an
2870 * add replace during app registration because the PID can be reassigned by
2871 * the OS.
2872 */
d0b96690 2873 iter.iter.node = &lta->pid_n.node;
bec39940 2874 ret = lttng_ht_del(ust_app_ht, &iter);
5b98a774
DG
2875 if (ret) {
2876 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
2877 lta->pid);
2878 }
852d0037 2879
d42f20df
DG
2880 /* Remove sessions so they are not visible during deletion.*/
2881 cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess,
2882 node.node) {
7972aab2
DG
2883 struct ust_registry_session *registry;
2884
d42f20df
DG
2885 ret = lttng_ht_del(lta->sessions, &iter);
2886 if (ret) {
2887 /* The session was already removed so scheduled for teardown. */
2888 continue;
2889 }
2890
2891 /*
2892 * Add session to list for teardown. This is safe since at this point we
2893 * are the only one using this list.
2894 */
d88aee68
DG
2895 pthread_mutex_lock(&ua_sess->lock);
2896
2897 /*
2898 * Normally, this is done in the delete session process which is
2899 * executed in the call rcu below. However, upon registration we can't
2900 * afford to wait for the grace period before pushing data or else the
2901 * data pending feature can race between the unregistration and stop
2902 * command where the data pending command is sent *before* the grace
2903 * period ended.
2904 *
2905 * The close metadata below nullifies the metadata pointer in the
2906 * session so the delete session will NOT push/close a second time.
2907 */
7972aab2 2908 registry = get_session_registry(ua_sess);
1b532a60 2909 if (registry && !registry->metadata_closed) {
7972aab2
DG
2910 /* Push metadata for application before freeing the application. */
2911 (void) push_metadata(registry, ua_sess->consumer);
2912
2913 /*
2914 * Don't ask to close metadata for global per UID buffers. Close
1b532a60
DG
2915 * metadata only on destroy trace session in this case. Also, the
2916 * previous push metadata could have flag the metadata registry to
2917 * close so don't send a close command if closed.
7972aab2 2918 */
1b532a60
DG
2919 if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID &&
2920 !registry->metadata_closed) {
7972aab2
DG
2921 /* And ask to close it for this session registry. */
2922 (void) close_metadata(registry, ua_sess->consumer);
2923 }
2924 }
d88aee68 2925
d42f20df 2926 cds_list_add(&ua_sess->teardown_node, &lta->teardown_head);
d88aee68 2927 pthread_mutex_unlock(&ua_sess->lock);
d42f20df
DG
2928 }
2929
852d0037
DG
2930 /* Free memory */
2931 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
2932
5b4a0ec0
DG
2933 rcu_read_unlock();
2934 return;
284d8f55
DG
2935}
2936
2937/*
5b4a0ec0 2938 * Return traceable_app_count
284d8f55 2939 */
5b4a0ec0 2940unsigned long ust_app_list_count(void)
284d8f55 2941{
5b4a0ec0 2942 unsigned long count;
284d8f55 2943
5b4a0ec0 2944 rcu_read_lock();
bec39940 2945 count = lttng_ht_get_count(ust_app_ht);
5b4a0ec0 2946 rcu_read_unlock();
284d8f55 2947
5b4a0ec0 2948 return count;
284d8f55
DG
2949}
2950
5b4a0ec0
DG
2951/*
2952 * Fill events array with all events name of all registered apps.
2953 */
2954int ust_app_list_events(struct lttng_event **events)
421cb601 2955{
5b4a0ec0
DG
2956 int ret, handle;
2957 size_t nbmem, count = 0;
bec39940 2958 struct lttng_ht_iter iter;
5b4a0ec0 2959 struct ust_app *app;
c617c0c6 2960 struct lttng_event *tmp_event;
421cb601 2961
5b4a0ec0 2962 nbmem = UST_APP_EVENT_LIST_SIZE;
c617c0c6
MD
2963 tmp_event = zmalloc(nbmem * sizeof(struct lttng_event));
2964 if (tmp_event == NULL) {
5b4a0ec0
DG
2965 PERROR("zmalloc ust app events");
2966 ret = -ENOMEM;
421cb601
DG
2967 goto error;
2968 }
2969
5b4a0ec0 2970 rcu_read_lock();
421cb601 2971
852d0037 2972 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
90eaa0d2 2973 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 2974
840cb59c 2975 health_code_update();
86acf0da 2976
e0c7ec2b
DG
2977 if (!app->compatible) {
2978 /*
2979 * TODO: In time, we should notice the caller of this error by
2980 * telling him that this is a version error.
2981 */
2982 continue;
2983 }
852d0037 2984 handle = ustctl_tracepoint_list(app->sock);
5b4a0ec0 2985 if (handle < 0) {
ffe60014
DG
2986 if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) {
2987 ERR("UST app list events getting handle failed for app pid %d",
2988 app->pid);
2989 }
5b4a0ec0
DG
2990 continue;
2991 }
421cb601 2992
852d0037 2993 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
fb54cdbf 2994 &uiter)) != -LTTNG_UST_ERR_NOENT) {
ffe60014
DG
2995 /* Handle ustctl error. */
2996 if (ret < 0) {
2997 free(tmp_event);
2998 if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) {
2999 ERR("UST app tp list get failed for app %d with ret %d",
3000 app->sock, ret);
3001 } else {
3002 DBG3("UST app tp list get failed. Application is dead");
3003 }
3004 goto rcu_error;
3005 }
3006
840cb59c 3007 health_code_update();
815564d8 3008 if (count >= nbmem) {
d7b3776f 3009 /* In case the realloc fails, we free the memory */
c617c0c6
MD
3010 void *ptr;
3011
815564d8
MD
3012 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
3013 2 * nbmem);
3014 nbmem *= 2;
c617c0c6
MD
3015 ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event));
3016 if (ptr == NULL) {
5b4a0ec0 3017 PERROR("realloc ust app events");
c617c0c6 3018 free(tmp_event);
5b4a0ec0
DG
3019 ret = -ENOMEM;
3020 goto rcu_error;
3021 }
c617c0c6 3022 tmp_event = ptr;
5b4a0ec0 3023 }
c617c0c6
MD
3024 memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
3025 tmp_event[count].loglevel = uiter.loglevel;
3026 tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
3027 tmp_event[count].pid = app->pid;
3028 tmp_event[count].enabled = -1;
5b4a0ec0 3029 count++;
421cb601 3030 }
421cb601
DG
3031 }
3032
5b4a0ec0 3033 ret = count;
c617c0c6 3034 *events = tmp_event;
421cb601 3035
5b4a0ec0 3036 DBG2("UST app list events done (%zu events)", count);
421cb601 3037
5b4a0ec0
DG
3038rcu_error:
3039 rcu_read_unlock();
421cb601 3040error:
840cb59c 3041 health_code_update();
5b4a0ec0 3042 return ret;
421cb601
DG
3043}
3044
f37d259d
MD
3045/*
3046 * Fill events array with all events name of all registered apps.
3047 */
3048int ust_app_list_event_fields(struct lttng_event_field **fields)
3049{
3050 int ret, handle;
3051 size_t nbmem, count = 0;
3052 struct lttng_ht_iter iter;
3053 struct ust_app *app;
c617c0c6 3054 struct lttng_event_field *tmp_event;
f37d259d
MD
3055
3056 nbmem = UST_APP_EVENT_LIST_SIZE;
c617c0c6
MD
3057 tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field));
3058 if (tmp_event == NULL) {
f37d259d
MD
3059 PERROR("zmalloc ust app event fields");
3060 ret = -ENOMEM;
3061 goto error;
3062 }
3063
3064 rcu_read_lock();
3065
3066 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
3067 struct lttng_ust_field_iter uiter;
3068
840cb59c 3069 health_code_update();
86acf0da 3070
f37d259d
MD
3071 if (!app->compatible) {
3072 /*
3073 * TODO: In time, we should notice the caller of this error by
3074 * telling him that this is a version error.
3075 */
3076 continue;
3077 }
3078 handle = ustctl_tracepoint_field_list(app->sock);
3079 if (handle < 0) {
ffe60014
DG
3080 if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) {
3081 ERR("UST app list field getting handle failed for app pid %d",
3082 app->pid);
3083 }
f37d259d
MD
3084 continue;
3085 }
3086
3087 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
fb54cdbf 3088 &uiter)) != -LTTNG_UST_ERR_NOENT) {
ffe60014
DG
3089 /* Handle ustctl error. */
3090 if (ret < 0) {
3091 free(tmp_event);
3092 if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) {
3093 ERR("UST app tp list field failed for app %d with ret %d",
3094 app->sock, ret);
3095 } else {
3096 DBG3("UST app tp list field failed. Application is dead");
3097 }
3098 goto rcu_error;
3099 }
3100
840cb59c 3101 health_code_update();
f37d259d 3102 if (count >= nbmem) {
d7b3776f 3103 /* In case the realloc fails, we free the memory */
c617c0c6
MD
3104 void *ptr;
3105
f37d259d
MD
3106 DBG2("Reallocating event field list from %zu to %zu entries", nbmem,
3107 2 * nbmem);
3108 nbmem *= 2;
c617c0c6
MD
3109 ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field));
3110 if (ptr == NULL) {
f37d259d 3111 PERROR("realloc ust app event fields");
c617c0c6 3112 free(tmp_event);
f37d259d
MD
3113 ret = -ENOMEM;
3114 goto rcu_error;
3115 }
c617c0c6 3116 tmp_event = ptr;
f37d259d 3117 }
f37d259d 3118
c617c0c6
MD
3119 memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
3120 tmp_event[count].type = uiter.type;
3121 tmp_event[count].nowrite = uiter.nowrite;
f37d259d 3122
c617c0c6
MD
3123 memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
3124 tmp_event[count].event.loglevel = uiter.loglevel;
3125 tmp_event[count].event.type = LTTNG_UST_TRACEPOINT;
3126 tmp_event[count].event.pid = app->pid;
3127 tmp_event[count].event.enabled = -1;
f37d259d
MD
3128 count++;
3129 }
3130 }
3131
3132 ret = count;
c617c0c6 3133 *fields = tmp_event;
f37d259d
MD
3134
3135 DBG2("UST app list event fields done (%zu events)", count);
3136
3137rcu_error:
3138 rcu_read_unlock();
3139error:
840cb59c 3140 health_code_update();
f37d259d
MD
3141 return ret;
3142}
3143
5b4a0ec0
DG
3144/*
3145 * Free and clean all traceable apps of the global list.
36b588ed
MD
3146 *
3147 * Should _NOT_ be called with RCU read-side lock held.
5b4a0ec0
DG
3148 */
3149void ust_app_clean_list(void)
421cb601 3150{
5b4a0ec0 3151 int ret;
659ed79f 3152 struct ust_app *app;
bec39940 3153 struct lttng_ht_iter iter;
421cb601 3154
5b4a0ec0 3155 DBG2("UST app cleaning registered apps hash table");
421cb601 3156
5b4a0ec0 3157 rcu_read_lock();
421cb601 3158
659ed79f 3159 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 3160 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 3161 assert(!ret);
659ed79f 3162 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
421cb601
DG
3163 }
3164
852d0037 3165 /* Cleanup socket hash table */
659ed79f
DG
3166 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app,
3167 sock_n.node) {
852d0037 3168 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
bec39940
DG
3169 assert(!ret);
3170 }
852d0037 3171
d88aee68
DG
3172 /* Cleanup notify socket hash table */
3173 cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app,
3174 notify_sock_n.node) {
3175 ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
3176 assert(!ret);
3177 }
36b588ed 3178 rcu_read_unlock();
d88aee68 3179
bec39940 3180 /* Destroy is done only when the ht is empty */
0b2dc8df
MD
3181 ht_cleanup_push(ust_app_ht);
3182 ht_cleanup_push(ust_app_ht_by_sock);
3183 ht_cleanup_push(ust_app_ht_by_notify_sock);
5b4a0ec0
DG
3184}
3185
3186/*
3187 * Init UST app hash table.
3188 */
3189void ust_app_ht_alloc(void)
3190{
bec39940 3191 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
852d0037 3192 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
d0b96690 3193 ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
421cb601
DG
3194}
3195
78f0bacd
DG
3196/*
3197 * For a specific UST session, disable the channel for all registered apps.
3198 */
35a9059d 3199int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
3200 struct ltt_ust_channel *uchan)
3201{
3202 int ret = 0;
bec39940
DG
3203 struct lttng_ht_iter iter;
3204 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
3205 struct ust_app *app;
3206 struct ust_app_session *ua_sess;
8535a6d9 3207 struct ust_app_channel *ua_chan;
78f0bacd
DG
3208
3209 if (usess == NULL || uchan == NULL) {
3210 ERR("Disabling UST global channel with NULL values");
3211 ret = -1;
3212 goto error;
3213 }
3214
d9bf3ca4 3215 DBG2("UST app disabling channel %s from global domain for session id %" PRIu64,
a991f516 3216 uchan->name, usess->id);
78f0bacd
DG
3217
3218 rcu_read_lock();
3219
3220 /* For every registered applications */
852d0037 3221 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 3222 struct lttng_ht_iter uiter;
e0c7ec2b
DG
3223 if (!app->compatible) {
3224 /*
3225 * TODO: In time, we should notice the caller of this error by
3226 * telling him that this is a version error.
3227 */
3228 continue;
3229 }
78f0bacd
DG
3230 ua_sess = lookup_session_by_app(usess, app);
3231 if (ua_sess == NULL) {
3232 continue;
3233 }
3234
8535a6d9 3235 /* Get channel */
bec39940
DG
3236 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
3237 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9
DG
3238 /* If the session if found for the app, the channel must be there */
3239 assert(ua_chan_node);
3240
3241 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
3242 /* The channel must not be already disabled */
3243 assert(ua_chan->enabled == 1);
3244
3245 /* Disable channel onto application */
3246 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
3247 if (ret < 0) {
3248 /* XXX: We might want to report this error at some point... */
3249 continue;
3250 }
3251 }
3252
3253 rcu_read_unlock();
3254
3255error:
3256 return ret;
3257}
3258
3259/*
3260 * For a specific UST session, enable the channel for all registered apps.
3261 */
35a9059d 3262int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
3263 struct ltt_ust_channel *uchan)
3264{
3265 int ret = 0;
bec39940 3266 struct lttng_ht_iter iter;
78f0bacd
DG
3267 struct ust_app *app;
3268 struct ust_app_session *ua_sess;
3269
3270 if (usess == NULL || uchan == NULL) {
3271 ERR("Adding UST global channel to NULL values");
3272 ret = -1;
3273 goto error;
3274 }
3275
d9bf3ca4 3276 DBG2("UST app enabling channel %s to global domain for session id %" PRIu64,
a991f516 3277 uchan->name, usess->id);
78f0bacd
DG
3278
3279 rcu_read_lock();
3280
3281 /* For every registered applications */
852d0037 3282 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
3283 if (!app->compatible) {
3284 /*
3285 * TODO: In time, we should notice the caller of this error by
3286 * telling him that this is a version error.
3287 */
3288 continue;
3289 }
78f0bacd
DG
3290 ua_sess = lookup_session_by_app(usess, app);