Fix: format string type mismatch
[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.c
CommitLineData
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DG
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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AM
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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16 */
17
18#define _GNU_SOURCE
19#include <errno.h>
7972aab2 20#include <inttypes.h>
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;
ffe60014
DG
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
DG
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 */
18eace3b
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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) {
025faf73
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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
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127 }
128
129 /* One of the filters is NULL, fail. */
130 if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
131 goto no_match;
132 }
133
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134 if (key->filter && event->filter) {
135 /* Both filters exists, check length followed by the bytecode. */
136 if (event->filter->len != key->filter->len ||
137 memcmp(event->filter->data, key->filter->data,
138 event->filter->len) != 0) {
139 goto no_match;
140 }
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
d0b96690
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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
d88aee68
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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{
ffe60014
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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{
ffe60014
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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) {
ffe60014
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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) {
ffe60014
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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
DG
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
DG
366 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
367 ret = lttng_ht_del(ua_chan->ctx, &iter);
55cc08a6
DG
368 assert(!ret);
369 delete_ust_app_ctx(sock, ua_ctx);
370 }
d80a6244 371
55cc08a6 372 /* Wipe events */
bec39940
DG
373 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
374 node.node) {
375 ret = lttng_ht_del(ua_chan->events, &iter);
525b0740 376 assert(!ret);
d80a6244
DG
377 delete_ust_app_event(sock, ua_event);
378 }
edb67388 379
c8335706
MD
380 if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) {
381 /* Wipe and free registry from session registry. */
382 registry = get_session_registry(ua_chan->session);
383 if (registry) {
384 ust_registry_channel_del_free(registry, ua_chan->key);
385 }
7972aab2 386 }
d0b96690 387
edb67388 388 if (ua_chan->obj != NULL) {
d0b96690
DG
389 /* Remove channel from application UST object descriptor. */
390 iter.iter.node = &ua_chan->ust_objd_node.node;
391 lttng_ht_del(app->ust_objd, &iter);
ffe60014
DG
392 ret = ustctl_release_object(sock, ua_chan->obj);
393 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
394 ERR("UST app sock %d release channel obj failed with ret %d",
395 sock, ret);
396 }
7972aab2 397 lttng_fd_put(LTTNG_FD_APPS, 1);
edb67388
DG
398 free(ua_chan->obj);
399 }
36b588ed 400 call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu);
d80a6244
DG
401}
402
331744e3 403/*
1b532a60
DG
404 * Push metadata to consumer socket.
405 *
406 * The socket lock MUST be acquired.
407 * The ust app session lock MUST be acquired.
331744e3
JD
408 *
409 * On success, return the len of metadata pushed or else a negative value.
410 */
411ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
412 struct consumer_socket *socket, int send_zero_data)
413{
414 int ret;
415 char *metadata_str = NULL;
416 size_t len, offset;
417 ssize_t ret_val;
418
419 assert(registry);
420 assert(socket);
1b532a60
DG
421
422 /*
423 * On a push metadata error either the consumer is dead or the metadata
424 * channel has been destroyed because its endpoint might have died (e.g:
425 * relayd). If so, the metadata closed flag is set to 1 so we deny pushing
426 * metadata again which is not valid anymore on the consumer side.
427 *
428 * The ust app session mutex locked allows us to make this check without
429 * the registry lock.
430 */
431 if (registry->metadata_closed) {
432 return -EPIPE;
433 }
331744e3
JD
434
435 pthread_mutex_lock(&registry->lock);
436
437 offset = registry->metadata_len_sent;
438 len = registry->metadata_len - registry->metadata_len_sent;
439 if (len == 0) {
440 DBG3("No metadata to push for metadata key %" PRIu64,
441 registry->metadata_key);
442 ret_val = len;
443 if (send_zero_data) {
444 DBG("No metadata to push");
445 goto push_data;
446 }
447 goto end;
448 }
449
450 /* Allocate only what we have to send. */
451 metadata_str = zmalloc(len);
452 if (!metadata_str) {
453 PERROR("zmalloc ust app metadata string");
454 ret_val = -ENOMEM;
455 goto error;
456 }
457 /* Copy what we haven't send out. */
458 memcpy(metadata_str, registry->metadata + offset, len);
459 registry->metadata_len_sent += len;
460
461push_data:
462 pthread_mutex_unlock(&registry->lock);
463 ret = consumer_push_metadata(socket, registry->metadata_key,
464 metadata_str, len, offset);
465 if (ret < 0) {
466 ret_val = ret;
467 goto error_push;
468 }
469
470 free(metadata_str);
471 return len;
472
473end:
474error:
475 pthread_mutex_unlock(&registry->lock);
476error_push:
477 free(metadata_str);
478 return ret_val;
479}
480
d88aee68
DG
481/*
482 * For a given application and session, push metadata to consumer. The session
483 * lock MUST be acquired here before calling this.
331744e3
JD
484 * Either sock or consumer is required : if sock is NULL, the default
485 * socket to send the metadata is retrieved from consumer, if sock
486 * is not NULL we use it to send the metadata.
d88aee68
DG
487 *
488 * Return 0 on success else a negative error.
489 */
7972aab2
DG
490static int push_metadata(struct ust_registry_session *registry,
491 struct consumer_output *consumer)
d88aee68 492{
331744e3
JD
493 int ret_val;
494 ssize_t ret;
d88aee68
DG
495 struct consumer_socket *socket;
496
7972aab2
DG
497 assert(registry);
498 assert(consumer);
499
500 rcu_read_lock();
d88aee68 501
7972aab2
DG
502 /*
503 * Means that no metadata was assigned to the session. This can happens if
504 * no start has been done previously.
505 */
506 if (!registry->metadata_key) {
331744e3 507 ret_val = 0;
1b532a60 508 goto end_rcu_unlock;
d88aee68
DG
509 }
510
d88aee68 511 /* Get consumer socket to use to push the metadata.*/
7972aab2
DG
512 socket = consumer_find_socket_by_bitness(registry->bits_per_long,
513 consumer);
d88aee68 514 if (!socket) {
331744e3 515 ret_val = -1;
d88aee68
DG
516 goto error_rcu_unlock;
517 }
518
519 /*
520 * TODO: Currently, we hold the socket lock around sampling of the next
521 * metadata segment to ensure we send metadata over the consumer socket in
522 * the correct order. This makes the registry lock nest inside the socket
523 * lock.
524 *
525 * Please note that this is a temporary measure: we should move this lock
526 * back into ust_consumer_push_metadata() when the consumer gets the
527 * ability to reorder the metadata it receives.
528 */
529 pthread_mutex_lock(socket->lock);
331744e3
JD
530 ret = ust_app_push_metadata(registry, socket, 0);
531 pthread_mutex_unlock(socket->lock);
d88aee68 532 if (ret < 0) {
331744e3 533 ret_val = ret;
d88aee68
DG
534 goto error_rcu_unlock;
535 }
536
d88aee68 537 rcu_read_unlock();
d88aee68
DG
538 return 0;
539
d88aee68 540error_rcu_unlock:
1b532a60
DG
541 /*
542 * On error, flag the registry that the metadata is closed. We were unable
543 * to push anything and this means that either the consumer is not
544 * responding or the metadata cache has been destroyed on the consumer.
545 */
546 registry->metadata_closed = 1;
547end_rcu_unlock:
d88aee68 548 rcu_read_unlock();
331744e3 549 return ret_val;
d88aee68
DG
550}
551
552/*
553 * Send to the consumer a close metadata command for the given session. Once
554 * done, the metadata channel is deleted and the session metadata pointer is
555 * nullified. The session lock MUST be acquired here unless the application is
556 * in the destroy path.
557 *
558 * Return 0 on success else a negative value.
559 */
7972aab2
DG
560static int close_metadata(struct ust_registry_session *registry,
561 struct consumer_output *consumer)
d88aee68
DG
562{
563 int ret;
564 struct consumer_socket *socket;
565
7972aab2
DG
566 assert(registry);
567 assert(consumer);
d88aee68 568
7972aab2
DG
569 rcu_read_lock();
570
571 if (!registry->metadata_key || registry->metadata_closed) {
d88aee68 572 ret = 0;
1b532a60 573 goto end;
d88aee68
DG
574 }
575
d88aee68 576 /* Get consumer socket to use to push the metadata.*/
7972aab2
DG
577 socket = consumer_find_socket_by_bitness(registry->bits_per_long,
578 consumer);
d88aee68
DG
579 if (!socket) {
580 ret = -1;
7972aab2 581 goto error;
d88aee68
DG
582 }
583
7972aab2 584 ret = consumer_close_metadata(socket, registry->metadata_key);
d88aee68 585 if (ret < 0) {
7972aab2 586 goto error;
d88aee68
DG
587 }
588
d88aee68 589error:
1b532a60
DG
590 /*
591 * Metadata closed. Even on error this means that the consumer is not
592 * responding or not found so either way a second close should NOT be emit
593 * for this registry.
594 */
595 registry->metadata_closed = 1;
596end:
7972aab2 597 rcu_read_unlock();
d88aee68
DG
598 return ret;
599}
600
36b588ed
MD
601/*
602 * We need to execute ht_destroy outside of RCU read-side critical
0b2dc8df
MD
603 * section and outside of call_rcu thread, so we postpone its execution
604 * using ht_cleanup_push. It is simpler than to change the semantic of
605 * the many callers of delete_ust_app_session().
36b588ed
MD
606 */
607static
608void delete_ust_app_session_rcu(struct rcu_head *head)
609{
610 struct ust_app_session *ua_sess =
611 caa_container_of(head, struct ust_app_session, rcu_head);
612
0b2dc8df 613 ht_cleanup_push(ua_sess->channels);
36b588ed
MD
614 free(ua_sess);
615}
616
d80a6244
DG
617/*
618 * Delete ust app session safely. RCU read lock must be held before calling
619 * this function.
620 */
8b366481 621static
d0b96690
DG
622void delete_ust_app_session(int sock, struct ust_app_session *ua_sess,
623 struct ust_app *app)
d80a6244
DG
624{
625 int ret;
bec39940 626 struct lttng_ht_iter iter;
d80a6244 627 struct ust_app_channel *ua_chan;
7972aab2 628 struct ust_registry_session *registry;
d80a6244 629
d88aee68
DG
630 assert(ua_sess);
631
1b532a60
DG
632 pthread_mutex_lock(&ua_sess->lock);
633
7972aab2 634 registry = get_session_registry(ua_sess);
1b532a60 635 if (registry && !registry->metadata_closed) {
d88aee68 636 /* Push metadata for application before freeing the application. */
7972aab2 637 (void) push_metadata(registry, ua_sess->consumer);
d88aee68 638
7972aab2
DG
639 /*
640 * Don't ask to close metadata for global per UID buffers. Close
1b532a60
DG
641 * metadata only on destroy trace session in this case. Also, the
642 * previous push metadata could have flag the metadata registry to
643 * close so don't send a close command if closed.
7972aab2 644 */
1b532a60
DG
645 if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID &&
646 !registry->metadata_closed) {
7972aab2
DG
647 /* And ask to close it for this session registry. */
648 (void) close_metadata(registry, ua_sess->consumer);
649 }
d80a6244
DG
650 }
651
bec39940
DG
652 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
653 node.node) {
654 ret = lttng_ht_del(ua_sess->channels, &iter);
525b0740 655 assert(!ret);
d0b96690 656 delete_ust_app_channel(sock, ua_chan, app);
d80a6244 657 }
d80a6244 658
7972aab2
DG
659 /* In case of per PID, the registry is kept in the session. */
660 if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) {
661 struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id);
662 if (reg_pid) {
663 buffer_reg_pid_remove(reg_pid);
664 buffer_reg_pid_destroy(reg_pid);
665 }
666 }
d0b96690 667
aee6bafd 668 if (ua_sess->handle != -1) {
ffe60014
DG
669 ret = ustctl_release_handle(sock, ua_sess->handle);
670 if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
671 ERR("UST app sock %d release session handle failed with ret %d",
672 sock, ret);
673 }
aee6bafd 674 }
1b532a60
DG
675 pthread_mutex_unlock(&ua_sess->lock);
676
36b588ed 677 call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu);
d80a6244 678}
91d76f53
DG
679
680/*
284d8f55
DG
681 * Delete a traceable application structure from the global list. Never call
682 * this function outside of a call_rcu call.
36b588ed
MD
683 *
684 * RCU read side lock should _NOT_ be held when calling this function.
91d76f53 685 */
8b366481
DG
686static
687void delete_ust_app(struct ust_app *app)
91d76f53 688{
8b366481 689 int ret, sock;
d42f20df 690 struct ust_app_session *ua_sess, *tmp_ua_sess;
44d3bd01 691
d80a6244 692 /* Delete ust app sessions info */
852d0037
DG
693 sock = app->sock;
694 app->sock = -1;
d80a6244 695
8b366481 696 /* Wipe sessions */
d42f20df
DG
697 cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head,
698 teardown_node) {
699 /* Free every object in the session and the session. */
36b588ed 700 rcu_read_lock();
d0b96690 701 delete_ust_app_session(sock, ua_sess, app);
36b588ed 702 rcu_read_unlock();
d80a6244 703 }
36b588ed 704
0b2dc8df
MD
705 ht_cleanup_push(app->sessions);
706 ht_cleanup_push(app->ust_objd);
d80a6244 707
6414a713 708 /*
852d0037
DG
709 * Wait until we have deleted the application from the sock hash table
710 * before closing this socket, otherwise an application could re-use the
711 * socket ID and race with the teardown, using the same hash table entry.
712 *
713 * It's OK to leave the close in call_rcu. We want it to stay unique for
714 * all RCU readers that could run concurrently with unregister app,
715 * therefore we _need_ to only close that socket after a grace period. So
716 * it should stay in this RCU callback.
717 *
718 * This close() is a very important step of the synchronization model so
719 * every modification to this function must be carefully reviewed.
6414a713 720 */
799e2c4f
MD
721 ret = close(sock);
722 if (ret) {
723 PERROR("close");
724 }
4063050c 725 lttng_fd_put(LTTNG_FD_APPS, 1);
d80a6244 726
852d0037 727 DBG2("UST app pid %d deleted", app->pid);
284d8f55 728 free(app);
099e26bd
DG
729}
730
731/*
f6a9efaa 732 * URCU intermediate call to delete an UST app.
099e26bd 733 */
8b366481
DG
734static
735void delete_ust_app_rcu(struct rcu_head *head)
099e26bd 736{
bec39940
DG
737 struct lttng_ht_node_ulong *node =
738 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa 739 struct ust_app *app =
852d0037 740 caa_container_of(node, struct ust_app, pid_n);
f6a9efaa 741
852d0037 742 DBG3("Call RCU deleting app PID %d", app->pid);
f6a9efaa 743 delete_ust_app(app);
099e26bd
DG
744}
745
ffe60014
DG
746/*
747 * Delete the session from the application ht and delete the data structure by
748 * freeing every object inside and releasing them.
749 */
d0b96690 750static void destroy_app_session(struct ust_app *app,
ffe60014
DG
751 struct ust_app_session *ua_sess)
752{
753 int ret;
754 struct lttng_ht_iter iter;
755
756 assert(app);
757 assert(ua_sess);
758
759 iter.iter.node = &ua_sess->node.node;
760 ret = lttng_ht_del(app->sessions, &iter);
761 if (ret) {
762 /* Already scheduled for teardown. */
763 goto end;
764 }
765
766 /* Once deleted, free the data structure. */
d0b96690 767 delete_ust_app_session(app->sock, ua_sess, app);
ffe60014
DG
768
769end:
770 return;
771}
772
8b366481
DG
773/*
774 * Alloc new UST app session.
775 */
776static
d0b96690 777struct ust_app_session *alloc_ust_app_session(struct ust_app *app)
8b366481
DG
778{
779 struct ust_app_session *ua_sess;
780
781 /* Init most of the default value by allocating and zeroing */
782 ua_sess = zmalloc(sizeof(struct ust_app_session));
783 if (ua_sess == NULL) {
784 PERROR("malloc");
ffe60014 785 goto error_free;
8b366481
DG
786 }
787
788 ua_sess->handle = -1;
bec39940 789 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
d0b96690 790 pthread_mutex_init(&ua_sess->lock, NULL);
ffe60014 791
8b366481
DG
792 return ua_sess;
793
ffe60014 794error_free:
8b366481
DG
795 return NULL;
796}
797
798/*
799 * Alloc new UST app channel.
800 */
801static
802struct ust_app_channel *alloc_ust_app_channel(char *name,
d0b96690 803 struct ust_app_session *ua_sess,
ffe60014 804 struct lttng_ust_channel_attr *attr)
8b366481
DG
805{
806 struct ust_app_channel *ua_chan;
807
808 /* Init most of the default value by allocating and zeroing */
809 ua_chan = zmalloc(sizeof(struct ust_app_channel));
810 if (ua_chan == NULL) {
811 PERROR("malloc");
812 goto error;
813 }
814
815 /* Setup channel name */
816 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
817 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
818
819 ua_chan->enabled = 1;
820 ua_chan->handle = -1;
45893984 821 ua_chan->session = ua_sess;
ffe60014 822 ua_chan->key = get_next_channel_key();
bec39940
DG
823 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
824 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
825 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
8b366481
DG
826
827 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
828
829 /* Copy attributes */
830 if (attr) {
ffe60014 831 /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */
2fe6e7f5
DG
832 ua_chan->attr.subbuf_size = attr->subbuf_size;
833 ua_chan->attr.num_subbuf = attr->num_subbuf;
834 ua_chan->attr.overwrite = attr->overwrite;
835 ua_chan->attr.switch_timer_interval = attr->switch_timer_interval;
836 ua_chan->attr.read_timer_interval = attr->read_timer_interval;
837 ua_chan->attr.output = attr->output;
8b366481 838 }
ffe60014
DG
839 /* By default, the channel is a per cpu channel. */
840 ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU;
8b366481
DG
841
842 DBG3("UST app channel %s allocated", ua_chan->name);
843
844 return ua_chan;
845
846error:
847 return NULL;
848}
849
37f1c236
DG
850/*
851 * Allocate and initialize a UST app stream.
852 *
853 * Return newly allocated stream pointer or NULL on error.
854 */
ffe60014 855struct ust_app_stream *ust_app_alloc_stream(void)
37f1c236
DG
856{
857 struct ust_app_stream *stream = NULL;
858
859 stream = zmalloc(sizeof(*stream));
860 if (stream == NULL) {
861 PERROR("zmalloc ust app stream");
862 goto error;
863 }
864
865 /* Zero could be a valid value for a handle so flag it to -1. */
866 stream->handle = -1;
867
868error:
869 return stream;
870}
871
8b366481
DG
872/*
873 * Alloc new UST app event.
874 */
875static
876struct ust_app_event *alloc_ust_app_event(char *name,
877 struct lttng_ust_event *attr)
878{
879 struct ust_app_event *ua_event;
880
881 /* Init most of the default value by allocating and zeroing */
882 ua_event = zmalloc(sizeof(struct ust_app_event));
883 if (ua_event == NULL) {
884 PERROR("malloc");
885 goto error;
886 }
887
888 ua_event->enabled = 1;
889 strncpy(ua_event->name, name, sizeof(ua_event->name));
890 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
bec39940 891 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
8b366481
DG
892
893 /* Copy attributes */
894 if (attr) {
895 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
896 }
897
898 DBG3("UST app event %s allocated", ua_event->name);
899
900 return ua_event;
901
902error:
903 return NULL;
904}
905
906/*
907 * Alloc new UST app context.
908 */
909static
910struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
911{
912 struct ust_app_ctx *ua_ctx;
913
914 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
915 if (ua_ctx == NULL) {
916 goto error;
917 }
918
919 if (uctx) {
920 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
921 }
922
923 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
924
925error:
926 return ua_ctx;
927}
928
025faf73
DG
929/*
930 * Allocate a filter and copy the given original filter.
931 *
932 * Return allocated filter or NULL on error.
933 */
934static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter(
935 struct lttng_ust_filter_bytecode *orig_f)
936{
937 struct lttng_ust_filter_bytecode *filter = NULL;
938
939 /* Copy filter bytecode */
940 filter = zmalloc(sizeof(*filter) + orig_f->len);
941 if (!filter) {
942 PERROR("zmalloc alloc ust app filter");
943 goto error;
944 }
945
946 memcpy(filter, orig_f, sizeof(*filter) + orig_f->len);
947
948error:
949 return filter;
950}
951
099e26bd 952/*
421cb601
DG
953 * Find an ust_app using the sock and return it. RCU read side lock must be
954 * held before calling this helper function.
099e26bd 955 */
8b366481
DG
956static
957struct ust_app *find_app_by_sock(int sock)
099e26bd 958{
bec39940 959 struct lttng_ht_node_ulong *node;
bec39940 960 struct lttng_ht_iter iter;
f6a9efaa 961
852d0037 962 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 963 node = lttng_ht_iter_get_node_ulong(&iter);
f6a9efaa
DG
964 if (node == NULL) {
965 DBG2("UST app find by sock %d not found", sock);
f6a9efaa
DG
966 goto error;
967 }
852d0037
DG
968
969 return caa_container_of(node, struct ust_app, sock_n);
f6a9efaa
DG
970
971error:
972 return NULL;
099e26bd
DG
973}
974
d0b96690
DG
975/*
976 * Find an ust_app using the notify sock and return it. RCU read side lock must
977 * be held before calling this helper function.
978 */
979static struct ust_app *find_app_by_notify_sock(int sock)
980{
981 struct lttng_ht_node_ulong *node;
982 struct lttng_ht_iter iter;
983
984 lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock),
985 &iter);
986 node = lttng_ht_iter_get_node_ulong(&iter);
987 if (node == NULL) {
988 DBG2("UST app find by notify sock %d not found", sock);
989 goto error;
990 }
991
992 return caa_container_of(node, struct ust_app, notify_sock_n);
993
994error:
995 return NULL;
996}
997
025faf73
DG
998/*
999 * Lookup for an ust app event based on event name, filter bytecode and the
1000 * event loglevel.
1001 *
1002 * Return an ust_app_event object or NULL on error.
1003 */
18eace3b
DG
1004static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht,
1005 char *name, struct lttng_ust_filter_bytecode *filter, int loglevel)
1006{
1007 struct lttng_ht_iter iter;
1008 struct lttng_ht_node_str *node;
1009 struct ust_app_event *event = NULL;
1010 struct ust_app_ht_key key;
18eace3b
DG
1011
1012 assert(name);
1013 assert(ht);
1014
1015 /* Setup key for event lookup. */
1016 key.name = name;
1017 key.filter = filter;
1018 key.loglevel = loglevel;
1019
025faf73
DG
1020 /* Lookup using the event name as hash and a custom match fct. */
1021 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
1022 ht_match_ust_app_event, &key, &iter.iter);
18eace3b
DG
1023 node = lttng_ht_iter_get_node_str(&iter);
1024 if (node == NULL) {
1025 goto end;
1026 }
1027
1028 event = caa_container_of(node, struct ust_app_event, node);
1029
1030end:
18eace3b
DG
1031 return event;
1032}
1033
55cc08a6
DG
1034/*
1035 * Create the channel context on the tracer.
d0b96690
DG
1036 *
1037 * Called with UST app session lock held.
55cc08a6
DG
1038 */
1039static
1040int create_ust_channel_context(struct ust_app_channel *ua_chan,
1041 struct ust_app_ctx *ua_ctx, struct ust_app *app)
1042{
1043 int ret;
1044
840cb59c 1045 health_code_update();
86acf0da 1046
852d0037 1047 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
55cc08a6
DG
1048 ua_chan->obj, &ua_ctx->obj);
1049 if (ret < 0) {
ffe60014
DG
1050 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1051 ERR("UST app create channel context failed for app (pid: %d) "
1052 "with ret %d", app->pid, ret);
1053 } else {
1054 DBG3("UST app disable event failed. Application is dead.");
1055 }
55cc08a6
DG
1056 goto error;
1057 }
1058
1059 ua_ctx->handle = ua_ctx->obj->handle;
1060
d0b96690
DG
1061 DBG2("UST app context handle %d created successfully for channel %s",
1062 ua_ctx->handle, ua_chan->name);
55cc08a6
DG
1063
1064error:
840cb59c 1065 health_code_update();
55cc08a6
DG
1066 return ret;
1067}
1068
53a80697
MD
1069/*
1070 * Set the filter on the tracer.
1071 */
1072static
1073int set_ust_event_filter(struct ust_app_event *ua_event,
1074 struct ust_app *app)
1075{
1076 int ret;
1077
840cb59c 1078 health_code_update();
86acf0da 1079
53a80697 1080 if (!ua_event->filter) {
86acf0da
DG
1081 ret = 0;
1082 goto error;
53a80697
MD
1083 }
1084
1085 ret = ustctl_set_filter(app->sock, ua_event->filter,
1086 ua_event->obj);
1087 if (ret < 0) {
ffe60014
DG
1088 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1089 ERR("UST app event %s filter failed for app (pid: %d) "
1090 "with ret %d", ua_event->attr.name, app->pid, ret);
1091 } else {
1092 DBG3("UST app filter event failed. Application is dead.");
1093 }
53a80697
MD
1094 goto error;
1095 }
1096
1097 DBG2("UST filter set successfully for event %s", ua_event->name);
1098
1099error:
840cb59c 1100 health_code_update();
53a80697
MD
1101 return ret;
1102}
1103
9730260e
DG
1104/*
1105 * Disable the specified event on to UST tracer for the UST session.
1106 */
1107static int disable_ust_event(struct ust_app *app,
1108 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
1109{
1110 int ret;
1111
840cb59c 1112 health_code_update();
86acf0da 1113
852d0037 1114 ret = ustctl_disable(app->sock, ua_event->obj);
9730260e 1115 if (ret < 0) {
ffe60014
DG
1116 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1117 ERR("UST app event %s disable failed for app (pid: %d) "
1118 "and session handle %d with ret %d",
1119 ua_event->attr.name, app->pid, ua_sess->handle, ret);
1120 } else {
1121 DBG3("UST app disable event failed. Application is dead.");
1122 }
9730260e
DG
1123 goto error;
1124 }
1125
1126 DBG2("UST app event %s disabled successfully for app (pid: %d)",
852d0037 1127 ua_event->attr.name, app->pid);
9730260e
DG
1128
1129error:
840cb59c 1130 health_code_update();
9730260e
DG
1131 return ret;
1132}
1133
78f0bacd
DG
1134/*
1135 * Disable the specified channel on to UST tracer for the UST session.
1136 */
1137static int disable_ust_channel(struct ust_app *app,
1138 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
1139{
1140 int ret;
1141
840cb59c 1142 health_code_update();
86acf0da 1143
852d0037 1144 ret = ustctl_disable(app->sock, ua_chan->obj);
78f0bacd 1145 if (ret < 0) {
ffe60014
DG
1146 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1147 ERR("UST app channel %s disable failed for app (pid: %d) "
1148 "and session handle %d with ret %d",
1149 ua_chan->name, app->pid, ua_sess->handle, ret);
1150 } else {
1151 DBG3("UST app disable channel failed. Application is dead.");
1152 }
78f0bacd
DG
1153 goto error;
1154 }
1155
78f0bacd 1156 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
852d0037 1157 ua_chan->name, app->pid);
78f0bacd
DG
1158
1159error:
840cb59c 1160 health_code_update();
78f0bacd
DG
1161 return ret;
1162}
1163
1164/*
1165 * Enable the specified channel on to UST tracer for the UST session.
1166 */
1167static int enable_ust_channel(struct ust_app *app,
1168 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
1169{
1170 int ret;
1171
840cb59c 1172 health_code_update();
86acf0da 1173
852d0037 1174 ret = ustctl_enable(app->sock, ua_chan->obj);
78f0bacd 1175 if (ret < 0) {
ffe60014
DG
1176 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1177 ERR("UST app channel %s enable failed for app (pid: %d) "
1178 "and session handle %d with ret %d",
1179 ua_chan->name, app->pid, ua_sess->handle, ret);
1180 } else {
1181 DBG3("UST app enable channel failed. Application is dead.");
1182 }
78f0bacd
DG
1183 goto error;
1184 }
1185
1186 ua_chan->enabled = 1;
1187
1188 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
852d0037 1189 ua_chan->name, app->pid);
78f0bacd
DG
1190
1191error:
840cb59c 1192 health_code_update();
78f0bacd
DG
1193 return ret;
1194}
1195
edb67388
DG
1196/*
1197 * Enable the specified event on to UST tracer for the UST session.
1198 */
1199static int enable_ust_event(struct ust_app *app,
1200 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
1201{
1202 int ret;
1203
840cb59c 1204 health_code_update();
86acf0da 1205
852d0037 1206 ret = ustctl_enable(app->sock, ua_event->obj);
edb67388 1207 if (ret < 0) {
ffe60014
DG
1208 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1209 ERR("UST app event %s enable failed for app (pid: %d) "
1210 "and session handle %d with ret %d",
1211 ua_event->attr.name, app->pid, ua_sess->handle, ret);
1212 } else {
1213 DBG3("UST app enable event failed. Application is dead.");
1214 }
edb67388
DG
1215 goto error;
1216 }
1217
1218 DBG2("UST app event %s enabled successfully for app (pid: %d)",
852d0037 1219 ua_event->attr.name, app->pid);
edb67388
DG
1220
1221error:
840cb59c 1222 health_code_update();
edb67388
DG
1223 return ret;
1224}
1225
099e26bd 1226/*
7972aab2 1227 * Send channel and stream buffer to application.
4f3ab6ee 1228 *
ffe60014 1229 * Return 0 on success. On error, a negative value is returned.
4f3ab6ee 1230 */
7972aab2
DG
1231static int send_channel_pid_to_ust(struct ust_app *app,
1232 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
4f3ab6ee
DG
1233{
1234 int ret;
ffe60014 1235 struct ust_app_stream *stream, *stmp;
4f3ab6ee
DG
1236
1237 assert(app);
ffe60014 1238 assert(ua_sess);
4f3ab6ee 1239 assert(ua_chan);
4f3ab6ee 1240
840cb59c 1241 health_code_update();
4f3ab6ee 1242
7972aab2
DG
1243 DBG("UST app sending channel %s to UST app sock %d", ua_chan->name,
1244 app->sock);
86acf0da 1245
ffe60014
DG
1246 /* Send channel to the application. */
1247 ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
5b4a0ec0 1248 if (ret < 0) {
b551a063
DG
1249 goto error;
1250 }
1251
d88aee68
DG
1252 health_code_update();
1253
ffe60014
DG
1254 /* Send all streams to application. */
1255 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
1256 ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream);
1257 if (ret < 0) {
1258 goto error;
1259 }
1260 /* We don't need the stream anymore once sent to the tracer. */
1261 cds_list_del(&stream->list);
1262 delete_ust_app_stream(-1, stream);
1263 }
ffe60014
DG
1264 /* Flag the channel that it is sent to the application. */
1265 ua_chan->is_sent = 1;
ffe60014 1266
b551a063 1267error:
840cb59c 1268 health_code_update();
b551a063
DG
1269 return ret;
1270}
1271
91d76f53 1272/*
5b4a0ec0 1273 * Create the specified event onto the UST tracer for a UST session.
d0b96690
DG
1274 *
1275 * Should be called with session mutex held.
91d76f53 1276 */
edb67388
DG
1277static
1278int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
1279 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
91d76f53 1280{
5b4a0ec0 1281 int ret = 0;
284d8f55 1282
840cb59c 1283 health_code_update();
86acf0da 1284
5b4a0ec0 1285 /* Create UST event on tracer */
852d0037 1286 ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
5b4a0ec0
DG
1287 &ua_event->obj);
1288 if (ret < 0) {
ffe60014
DG
1289 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1290 ERR("Error ustctl create event %s for app pid: %d with ret %d",
1291 ua_event->attr.name, app->pid, ret);
1292 } else {
1293 DBG3("UST app create event failed. Application is dead.");
1294 }
5b4a0ec0 1295 goto error;
91d76f53 1296 }
f6a9efaa 1297
5b4a0ec0 1298 ua_event->handle = ua_event->obj->handle;
284d8f55 1299
5b4a0ec0 1300 DBG2("UST app event %s created successfully for pid:%d",
852d0037 1301 ua_event->attr.name, app->pid);
f6a9efaa 1302
840cb59c 1303 health_code_update();
86acf0da 1304
025faf73
DG
1305 /* Set filter if one is present. */
1306 if (ua_event->filter) {
1307 ret = set_ust_event_filter(ua_event, app);
1308 if (ret < 0) {
1309 goto error;
1310 }
1311 }
1312
8535a6d9 1313 /* If event not enabled, disable it on the tracer */
fc34caaa 1314 if (ua_event->enabled == 0) {
8535a6d9
DG
1315 ret = disable_ust_event(app, ua_sess, ua_event);
1316 if (ret < 0) {
fc34caaa
DG
1317 /*
1318 * If we hit an EPERM, something is wrong with our disable call. If
1319 * we get an EEXIST, there is a problem on the tracer side since we
1320 * just created it.
1321 */
1322 switch (ret) {
49c336c1 1323 case -LTTNG_UST_ERR_PERM:
fc34caaa
DG
1324 /* Code flow problem */
1325 assert(0);
49c336c1 1326 case -LTTNG_UST_ERR_EXIST:
fc34caaa
DG
1327 /* It's OK for our use case. */
1328 ret = 0;
1329 break;
1330 default:
1331 break;
1332 }
8535a6d9
DG
1333 goto error;
1334 }
1335 }
1336
5b4a0ec0 1337error:
840cb59c 1338 health_code_update();
5b4a0ec0 1339 return ret;
91d76f53 1340}
48842b30 1341
5b4a0ec0
DG
1342/*
1343 * Copy data between an UST app event and a LTT event.
1344 */
421cb601 1345static void shadow_copy_event(struct ust_app_event *ua_event,
48842b30
DG
1346 struct ltt_ust_event *uevent)
1347{
1348 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
1349 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
1350
fc34caaa
DG
1351 ua_event->enabled = uevent->enabled;
1352
5b4a0ec0
DG
1353 /* Copy event attributes */
1354 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
1355
53a80697
MD
1356 /* Copy filter bytecode */
1357 if (uevent->filter) {
025faf73
DG
1358 ua_event->filter = alloc_copy_ust_app_filter(uevent->filter);
1359 /* Filter might be NULL here in case of ENONEM. */
53a80697 1360 }
48842b30
DG
1361}
1362
5b4a0ec0
DG
1363/*
1364 * Copy data between an UST app channel and a LTT channel.
1365 */
421cb601 1366static void shadow_copy_channel(struct ust_app_channel *ua_chan,
48842b30
DG
1367 struct ltt_ust_channel *uchan)
1368{
bec39940 1369 struct lttng_ht_iter iter;
48842b30 1370 struct ltt_ust_event *uevent;
55cc08a6 1371 struct ltt_ust_context *uctx;
48842b30 1372 struct ust_app_event *ua_event;
55cc08a6 1373 struct ust_app_ctx *ua_ctx;
48842b30 1374
fc34caaa 1375 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
48842b30
DG
1376
1377 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
1378 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
ffe60014 1379
1624d5b7
JD
1380 ua_chan->tracefile_size = uchan->tracefile_size;
1381 ua_chan->tracefile_count = uchan->tracefile_count;
1382
ffe60014
DG
1383 /* Copy event attributes since the layout is different. */
1384 ua_chan->attr.subbuf_size = uchan->attr.subbuf_size;
1385 ua_chan->attr.num_subbuf = uchan->attr.num_subbuf;
1386 ua_chan->attr.overwrite = uchan->attr.overwrite;
1387 ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval;
1388 ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval;
1389 ua_chan->attr.output = uchan->attr.output;
1390 /*
1391 * Note that the attribute channel type is not set since the channel on the
1392 * tracing registry side does not have this information.
1393 */
48842b30 1394
fc34caaa 1395 ua_chan->enabled = uchan->enabled;
7972aab2 1396 ua_chan->tracing_channel_id = uchan->id;
fc34caaa 1397
bec39940 1398 cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) {
55cc08a6
DG
1399 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
1400 if (ua_ctx == NULL) {
1401 continue;
1402 }
bec39940
DG
1403 lttng_ht_node_init_ulong(&ua_ctx->node,
1404 (unsigned long) ua_ctx->ctx.ctx);
1405 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6 1406 }
48842b30 1407
421cb601 1408 /* Copy all events from ltt ust channel to ust app channel */
bec39940 1409 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
18eace3b
DG
1410 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
1411 uevent->filter, uevent->attr.loglevel);
1412 if (ua_event == NULL) {
421cb601 1413 DBG2("UST event %s not found on shadow copy channel",
48842b30 1414 uevent->attr.name);
284d8f55 1415 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
48842b30 1416 if (ua_event == NULL) {
5b4a0ec0 1417 continue;
48842b30 1418 }
421cb601 1419 shadow_copy_event(ua_event, uevent);
d0b96690 1420 add_unique_ust_app_event(ua_chan, ua_event);
48842b30 1421 }
48842b30
DG
1422 }
1423
fc34caaa 1424 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
48842b30
DG
1425}
1426
5b4a0ec0
DG
1427/*
1428 * Copy data between a UST app session and a regular LTT session.
1429 */
421cb601 1430static void shadow_copy_session(struct ust_app_session *ua_sess,
bec39940 1431 struct ltt_ust_session *usess, struct ust_app *app)
48842b30 1432{
bec39940
DG
1433 struct lttng_ht_node_str *ua_chan_node;
1434 struct lttng_ht_iter iter;
48842b30
DG
1435 struct ltt_ust_channel *uchan;
1436 struct ust_app_channel *ua_chan;
477d7741
MD
1437 time_t rawtime;
1438 struct tm *timeinfo;
1439 char datetime[16];
1440 int ret;
1441
1442 /* Get date and time for unique app path */
1443 time(&rawtime);
1444 timeinfo = localtime(&rawtime);
1445 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
48842b30 1446
421cb601 1447 DBG2("Shadow copy of session handle %d", ua_sess->handle);
48842b30 1448
7972aab2
DG
1449 ua_sess->tracing_id = usess->id;
1450 ua_sess->id = get_next_session_id();
1451 ua_sess->uid = app->uid;
1452 ua_sess->gid = app->gid;
1453 ua_sess->euid = usess->uid;
1454 ua_sess->egid = usess->gid;
1455 ua_sess->buffer_type = usess->buffer_type;
1456 ua_sess->bits_per_long = app->bits_per_long;
1457 /* There is only one consumer object per session possible. */
1458 ua_sess->consumer = usess->consumer;
2bba9e53 1459 ua_sess->output_traces = usess->output_traces;
7972aab2
DG
1460
1461 switch (ua_sess->buffer_type) {
1462 case LTTNG_BUFFER_PER_PID:
1463 ret = snprintf(ua_sess->path, sizeof(ua_sess->path),
dec56f6c 1464 DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid,
7972aab2
DG
1465 datetime);
1466 break;
1467 case LTTNG_BUFFER_PER_UID:
1468 ret = snprintf(ua_sess->path, sizeof(ua_sess->path),
1469 DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long);
1470 break;
1471 default:
1472 assert(0);
1473 goto error;
1474 }
477d7741
MD
1475 if (ret < 0) {
1476 PERROR("asprintf UST shadow copy session");
477d7741 1477 assert(0);
7972aab2 1478 goto error;
477d7741
MD
1479 }
1480
48842b30 1481 /* Iterate over all channels in global domain. */
bec39940
DG
1482 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
1483 uchan, node.node) {
1484 struct lttng_ht_iter uiter;
ba767faf 1485
bec39940
DG
1486 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1487 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
5b4a0ec0 1488 if (ua_chan_node != NULL) {
fc34caaa 1489 /* Session exist. Contiuing. */
5b4a0ec0
DG
1490 continue;
1491 }
421cb601 1492
5b4a0ec0
DG
1493 DBG2("Channel %s not found on shadow session copy, creating it",
1494 uchan->name);
d0b96690 1495 ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr);
5b4a0ec0 1496 if (ua_chan == NULL) {
fc34caaa 1497 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
5b4a0ec0 1498 continue;
48842b30 1499 }
5b4a0ec0 1500 shadow_copy_channel(ua_chan, uchan);
ffe60014
DG
1501 /*
1502 * The concept of metadata channel does not exist on the tracing
1503 * registry side of the session daemon so this can only be a per CPU
1504 * channel and not metadata.
1505 */
1506 ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU;
1507
bec39940 1508 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
48842b30 1509 }
7972aab2
DG
1510
1511error:
1512 return;
48842b30
DG
1513}
1514
78f0bacd
DG
1515/*
1516 * Lookup sesison wrapper.
1517 */
84cd17c6
MD
1518static
1519void __lookup_session_by_app(struct ltt_ust_session *usess,
bec39940 1520 struct ust_app *app, struct lttng_ht_iter *iter)
84cd17c6
MD
1521{
1522 /* Get right UST app session from app */
d9bf3ca4 1523 lttng_ht_lookup(app->sessions, &usess->id, iter);
84cd17c6
MD
1524}
1525
421cb601
DG
1526/*
1527 * Return ust app session from the app session hashtable using the UST session
a991f516 1528 * id.
421cb601 1529 */
48842b30
DG
1530static struct ust_app_session *lookup_session_by_app(
1531 struct ltt_ust_session *usess, struct ust_app *app)
1532{
bec39940 1533 struct lttng_ht_iter iter;
d9bf3ca4 1534 struct lttng_ht_node_u64 *node;
48842b30 1535
84cd17c6 1536 __lookup_session_by_app(usess, app, &iter);
d9bf3ca4 1537 node = lttng_ht_iter_get_node_u64(&iter);
48842b30
DG
1538 if (node == NULL) {
1539 goto error;
1540 }
1541
1542 return caa_container_of(node, struct ust_app_session, node);
1543
1544error:
1545 return NULL;
1546}
1547
7972aab2
DG
1548/*
1549 * Setup buffer registry per PID for the given session and application. If none
1550 * is found, a new one is created, added to the global registry and
1551 * initialized. If regp is valid, it's set with the newly created object.
1552 *
1553 * Return 0 on success or else a negative value.
1554 */
1555static int setup_buffer_reg_pid(struct ust_app_session *ua_sess,
1556 struct ust_app *app, struct buffer_reg_pid **regp)
1557{
1558 int ret = 0;
1559 struct buffer_reg_pid *reg_pid;
1560
1561 assert(ua_sess);
1562 assert(app);
1563
1564 rcu_read_lock();
1565
1566 reg_pid = buffer_reg_pid_find(ua_sess->id);
1567 if (!reg_pid) {
1568 /*
1569 * This is the create channel path meaning that if there is NO
1570 * registry available, we have to create one for this session.
1571 */
1572 ret = buffer_reg_pid_create(ua_sess->id, &reg_pid);
1573 if (ret < 0) {
1574 goto error;
1575 }
1576 buffer_reg_pid_add(reg_pid);
1577 } else {
1578 goto end;
1579 }
1580
1581 /* Initialize registry. */
1582 ret = ust_registry_session_init(&reg_pid->registry->reg.ust, app,
1583 app->bits_per_long, app->uint8_t_alignment,
1584 app->uint16_t_alignment, app->uint32_t_alignment,
af6142cf
MD
1585 app->uint64_t_alignment, app->long_alignment,
1586 app->byte_order, app->version.major,
1587 app->version.minor);
7972aab2
DG
1588 if (ret < 0) {
1589 goto error;
1590 }
1591
1592 DBG3("UST app buffer registry per PID created successfully");
1593
1594end:
1595 if (regp) {
1596 *regp = reg_pid;
1597 }
1598error:
1599 rcu_read_unlock();
1600 return ret;
1601}
1602
1603/*
1604 * Setup buffer registry per UID for the given session and application. If none
1605 * is found, a new one is created, added to the global registry and
1606 * initialized. If regp is valid, it's set with the newly created object.
1607 *
1608 * Return 0 on success or else a negative value.
1609 */
1610static int setup_buffer_reg_uid(struct ltt_ust_session *usess,
1611 struct ust_app *app, struct buffer_reg_uid **regp)
1612{
1613 int ret = 0;
1614 struct buffer_reg_uid *reg_uid;
1615
1616 assert(usess);
1617 assert(app);
1618
1619 rcu_read_lock();
1620
1621 reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid);
1622 if (!reg_uid) {
1623 /*
1624 * This is the create channel path meaning that if there is NO
1625 * registry available, we have to create one for this session.
1626 */
1627 ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid,
1628 LTTNG_DOMAIN_UST, &reg_uid);
1629 if (ret < 0) {
1630 goto error;
1631 }
1632 buffer_reg_uid_add(reg_uid);
1633 } else {
1634 goto end;
1635 }
1636
1637 /* Initialize registry. */
af6142cf 1638 ret = ust_registry_session_init(&reg_uid->registry->reg.ust, NULL,
7972aab2
DG
1639 app->bits_per_long, app->uint8_t_alignment,
1640 app->uint16_t_alignment, app->uint32_t_alignment,
af6142cf
MD
1641 app->uint64_t_alignment, app->long_alignment,
1642 app->byte_order, app->version.major,
1643 app->version.minor);
7972aab2
DG
1644 if (ret < 0) {
1645 goto error;
1646 }
1647 /* Add node to teardown list of the session. */
1648 cds_list_add(&reg_uid->lnode, &usess->buffer_reg_uid_list);
1649
1650 DBG3("UST app buffer registry per UID created successfully");
1651
1652end:
1653 if (regp) {
1654 *regp = reg_uid;
1655 }
1656error:
1657 rcu_read_unlock();
1658 return ret;
1659}
1660
421cb601 1661/*
3d8ca23b 1662 * Create a session on the tracer side for the given app.
421cb601 1663 *
3d8ca23b
DG
1664 * On success, ua_sess_ptr is populated with the session pointer or else left
1665 * untouched. If the session was created, is_created is set to 1. On error,
1666 * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can
1667 * be NULL.
1668 *
1669 * Returns 0 on success or else a negative code which is either -ENOMEM or
1670 * -ENOTCONN which is the default code if the ustctl_create_session fails.
421cb601 1671 */
3d8ca23b
DG
1672static int create_ust_app_session(struct ltt_ust_session *usess,
1673 struct ust_app *app, struct ust_app_session **ua_sess_ptr,
1674 int *is_created)
421cb601 1675{
3d8ca23b 1676 int ret, created = 0;
421cb601
DG
1677 struct ust_app_session *ua_sess;
1678
3d8ca23b
DG
1679 assert(usess);
1680 assert(app);
1681 assert(ua_sess_ptr);
1682
840cb59c 1683 health_code_update();
86acf0da 1684
421cb601
DG
1685 ua_sess = lookup_session_by_app(usess, app);
1686 if (ua_sess == NULL) {
d9bf3ca4 1687 DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it",
852d0037 1688 app->pid, usess->id);
d0b96690 1689 ua_sess = alloc_ust_app_session(app);
421cb601
DG
1690 if (ua_sess == NULL) {
1691 /* Only malloc can failed so something is really wrong */
3d8ca23b
DG
1692 ret = -ENOMEM;
1693 goto error;
421cb601 1694 }
477d7741 1695 shadow_copy_session(ua_sess, usess, app);
3d8ca23b 1696 created = 1;
421cb601
DG
1697 }
1698
7972aab2
DG
1699 switch (usess->buffer_type) {
1700 case LTTNG_BUFFER_PER_PID:
1701 /* Init local registry. */
1702 ret = setup_buffer_reg_pid(ua_sess, app, NULL);
421cb601 1703 if (ret < 0) {
7972aab2
DG
1704 goto error;
1705 }
1706 break;
1707 case LTTNG_BUFFER_PER_UID:
1708 /* Look for a global registry. If none exists, create one. */
1709 ret = setup_buffer_reg_uid(usess, app, NULL);
1710 if (ret < 0) {
1711 goto error;
1712 }
1713 break;
1714 default:
1715 assert(0);
1716 ret = -EINVAL;
1717 goto error;
1718 }
1719
1720 health_code_update();
1721
1722 if (ua_sess->handle == -1) {
1723 ret = ustctl_create_session(app->sock);
1724 if (ret < 0) {
1725 if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
1726 ERR("Creating session for app pid %d with ret %d",
ffe60014
DG
1727 app->pid, ret);
1728 } else {
1729 DBG("UST app creating session failed. Application is dead");
1730 }
d0b96690 1731 delete_ust_app_session(-1, ua_sess, app);
3d8ca23b
DG
1732 if (ret != -ENOMEM) {
1733 /*
1734 * Tracer is probably gone or got an internal error so let's
1735 * behave like it will soon unregister or not usable.
1736 */
1737 ret = -ENOTCONN;
1738 }
1739 goto error;
421cb601
DG
1740 }
1741
7972aab2
DG
1742 ua_sess->handle = ret;
1743
1744 /* Add ust app session to app's HT */
d9bf3ca4
MD
1745 lttng_ht_node_init_u64(&ua_sess->node,
1746 ua_sess->tracing_id);
1747 lttng_ht_add_unique_u64(app->sessions, &ua_sess->node);
7972aab2
DG
1748
1749 DBG2("UST app session created successfully with handle %d", ret);
1750 }
1751
1752 *ua_sess_ptr = ua_sess;
1753 if (is_created) {
1754 *is_created = created;
1755 }
1756
1757 /* Everything went well. */
1758 ret = 0;
1759
1760error:
1761 health_code_update();
1762 return ret;
1763}
1764
1765/*
1766 * Create a context for the channel on the tracer.
1767 *
1768 * Called with UST app session lock held and a RCU read side lock.
1769 */
1770static
1771int create_ust_app_channel_context(struct ust_app_session *ua_sess,
1772 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
1773 struct ust_app *app)
1774{
1775 int ret = 0;
1776 struct lttng_ht_iter iter;
1777 struct lttng_ht_node_ulong *node;
1778 struct ust_app_ctx *ua_ctx;
1779
1780 DBG2("UST app adding context to channel %s", ua_chan->name);
1781
1782 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1783 node = lttng_ht_iter_get_node_ulong(&iter);
1784 if (node != NULL) {
1785 ret = -EEXIST;
1786 goto error;
1787 }
1788
1789 ua_ctx = alloc_ust_app_ctx(uctx);
1790 if (ua_ctx == NULL) {
1791 /* malloc failed */
1792 ret = -1;
1793 goto error;
1794 }
1795
1796 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1797 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
1798
1799 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
1800 if (ret < 0) {
1801 goto error;
1802 }
1803
1804error:
1805 return ret;
1806}
1807
1808/*
1809 * Enable on the tracer side a ust app event for the session and channel.
1810 *
1811 * Called with UST app session lock held.
1812 */
1813static
1814int enable_ust_app_event(struct ust_app_session *ua_sess,
1815 struct ust_app_event *ua_event, struct ust_app *app)
1816{
1817 int ret;
1818
1819 ret = enable_ust_event(app, ua_sess, ua_event);
1820 if (ret < 0) {
1821 goto error;
1822 }
1823
1824 ua_event->enabled = 1;
1825
1826error:
1827 return ret;
1828}
1829
1830/*
1831 * Disable on the tracer side a ust app event for the session and channel.
1832 */
1833static int disable_ust_app_event(struct ust_app_session *ua_sess,
1834 struct ust_app_event *ua_event, struct ust_app *app)
1835{
1836 int ret;
1837
1838 ret = disable_ust_event(app, ua_sess, ua_event);
1839 if (ret < 0) {
1840 goto error;
1841 }
1842
1843 ua_event->enabled = 0;
1844
1845error:
1846 return ret;
1847}
1848
1849/*
1850 * Lookup ust app channel for session and disable it on the tracer side.
1851 */
1852static
1853int disable_ust_app_channel(struct ust_app_session *ua_sess,
1854 struct ust_app_channel *ua_chan, struct ust_app *app)
1855{
1856 int ret;
1857
1858 ret = disable_ust_channel(app, ua_sess, ua_chan);
1859 if (ret < 0) {
1860 goto error;
1861 }
1862
1863 ua_chan->enabled = 0;
1864
1865error:
1866 return ret;
1867}
1868
1869/*
1870 * Lookup ust app channel for session and enable it on the tracer side. This
1871 * MUST be called with a RCU read side lock acquired.
1872 */
1873static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1874 struct ltt_ust_channel *uchan, struct ust_app *app)
1875{
1876 int ret = 0;
1877 struct lttng_ht_iter iter;
1878 struct lttng_ht_node_str *ua_chan_node;
1879 struct ust_app_channel *ua_chan;
1880
1881 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1882 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1883 if (ua_chan_node == NULL) {
d9bf3ca4 1884 DBG2("Unable to find channel %s in ust session id %" PRIu64,
7972aab2
DG
1885 uchan->name, ua_sess->tracing_id);
1886 goto error;
1887 }
1888
1889 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1890
1891 ret = enable_ust_channel(app, ua_sess, ua_chan);
1892 if (ret < 0) {
1893 goto error;
1894 }
1895
1896error:
1897 return ret;
1898}
1899
1900/*
1901 * Ask the consumer to create a channel and get it if successful.
1902 *
1903 * Return 0 on success or else a negative value.
1904 */
1905static int do_consumer_create_channel(struct ltt_ust_session *usess,
1906 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan,
1907 int bitness, struct ust_registry_session *registry)
1908{
1909 int ret;
1910 unsigned int nb_fd = 0;
1911 struct consumer_socket *socket;
1912
1913 assert(usess);
1914 assert(ua_sess);
1915 assert(ua_chan);
1916 assert(registry);
1917
1918 rcu_read_lock();
1919 health_code_update();
1920
1921 /* Get the right consumer socket for the application. */
1922 socket = consumer_find_socket_by_bitness(bitness, usess->consumer);
1923 if (!socket) {
1924 ret = -EINVAL;
1925 goto error;
1926 }
1927
1928 health_code_update();
1929
1930 /* Need one fd for the channel. */
1931 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
1932 if (ret < 0) {
1933 ERR("Exhausted number of available FD upon create channel");
1934 goto error;
1935 }
1936
1937 /*
1938 * Ask consumer to create channel. The consumer will return the number of
1939 * stream we have to expect.
1940 */
1941 ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket,
1942 registry);
1943 if (ret < 0) {
1944 goto error_ask;
1945 }
1946
1947 /*
1948 * Compute the number of fd needed before receiving them. It must be 2 per
1949 * stream (2 being the default value here).
1950 */
1951 nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count;
1952
1953 /* Reserve the amount of file descriptor we need. */
1954 ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd);
1955 if (ret < 0) {
1956 ERR("Exhausted number of available FD upon create channel");
1957 goto error_fd_get_stream;
1958 }
1959
1960 health_code_update();
1961
1962 /*
1963 * Now get the channel from the consumer. This call wil populate the stream
1964 * list of that channel and set the ust objects.
1965 */
d9078d0c
DG
1966 if (usess->consumer->enabled) {
1967 ret = ust_consumer_get_channel(socket, ua_chan);
1968 if (ret < 0) {
1969 goto error_destroy;
1970 }
7972aab2
DG
1971 }
1972
1973 rcu_read_unlock();
1974 return 0;
1975
1976error_destroy:
1977 lttng_fd_put(LTTNG_FD_APPS, nb_fd);
1978error_fd_get_stream:
1979 /*
1980 * Initiate a destroy channel on the consumer since we had an error
1981 * handling it on our side. The return value is of no importance since we
1982 * already have a ret value set by the previous error that we need to
1983 * return.
1984 */
1985 (void) ust_consumer_destroy_channel(socket, ua_chan);
1986error_ask:
1987 lttng_fd_put(LTTNG_FD_APPS, 1);
1988error:
1989 health_code_update();
1990 rcu_read_unlock();
1991 return ret;
1992}
1993
1994/*
1995 * Duplicate the ust data object of the ust app stream and save it in the
1996 * buffer registry stream.
1997 *
1998 * Return 0 on success or else a negative value.
1999 */
2000static int duplicate_stream_object(struct buffer_reg_stream *reg_stream,
2001 struct ust_app_stream *stream)
2002{
2003 int ret;
2004
2005 assert(reg_stream);
2006 assert(stream);
2007
2008 /* Reserve the amount of file descriptor we need. */
2009 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2010 if (ret < 0) {
2011 ERR("Exhausted number of available FD upon duplicate stream");
2012 goto error;
2013 }
2014
2015 /* Duplicate object for stream once the original is in the registry. */
2016 ret = ustctl_duplicate_ust_object_data(&stream->obj,
2017 reg_stream->obj.ust);
2018 if (ret < 0) {
2019 ERR("Duplicate stream obj from %p to %p failed with ret %d",
2020 reg_stream->obj.ust, stream->obj, ret);
2021 lttng_fd_put(LTTNG_FD_APPS, 2);
2022 goto error;
2023 }
2024 stream->handle = stream->obj->handle;
2025
2026error:
2027 return ret;
2028}
2029
2030/*
2031 * Duplicate the ust data object of the ust app. channel and save it in the
2032 * buffer registry channel.
2033 *
2034 * Return 0 on success or else a negative value.
2035 */
2036static int duplicate_channel_object(struct buffer_reg_channel *reg_chan,
2037 struct ust_app_channel *ua_chan)
2038{
2039 int ret;
2040
2041 assert(reg_chan);
2042 assert(ua_chan);
2043
2044 /* Need two fds for the channel. */
2045 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2046 if (ret < 0) {
2047 ERR("Exhausted number of available FD upon duplicate channel");
2048 goto error_fd_get;
2049 }
2050
2051 /* Duplicate object for stream once the original is in the registry. */
2052 ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust);
2053 if (ret < 0) {
2054 ERR("Duplicate channel obj from %p to %p failed with ret: %d",
2055 reg_chan->obj.ust, ua_chan->obj, ret);
2056 goto error;
2057 }
2058 ua_chan->handle = ua_chan->obj->handle;
2059
2060 return 0;
2061
2062error:
2063 lttng_fd_put(LTTNG_FD_APPS, 1);
2064error_fd_get:
2065 return ret;
2066}
2067
2068/*
2069 * For a given channel buffer registry, setup all streams of the given ust
2070 * application channel.
2071 *
2072 * Return 0 on success or else a negative value.
2073 */
2074static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan,
2075 struct ust_app_channel *ua_chan)
2076{
2077 int ret = 0;
2078 struct ust_app_stream *stream, *stmp;
2079
2080 assert(reg_chan);
2081 assert(ua_chan);
2082
2083 DBG2("UST app setup buffer registry stream");
2084
2085 /* Send all streams to application. */
2086 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
2087 struct buffer_reg_stream *reg_stream;
2088
2089 ret = buffer_reg_stream_create(&reg_stream);
2090 if (ret < 0) {
2091 goto error;
2092 }
2093
2094 /*
2095 * Keep original pointer and nullify it in the stream so the delete
2096 * stream call does not release the object.
2097 */
2098 reg_stream->obj.ust = stream->obj;
2099 stream->obj = NULL;
2100 buffer_reg_stream_add(reg_stream, reg_chan);
421cb601 2101
7972aab2
DG
2102 /* We don't need the streams anymore. */
2103 cds_list_del(&stream->list);
2104 delete_ust_app_stream(-1, stream);
2105 }
421cb601 2106
7972aab2
DG
2107error:
2108 return ret;
2109}
2110
2111/*
2112 * Create a buffer registry channel for the given session registry and
2113 * application channel object. If regp pointer is valid, it's set with the
2114 * created object. Important, the created object is NOT added to the session
2115 * registry hash table.
2116 *
2117 * Return 0 on success else a negative value.
2118 */
2119static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess,
2120 struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp)
2121{
2122 int ret;
2123 struct buffer_reg_channel *reg_chan = NULL;
2124
2125 assert(reg_sess);
2126 assert(ua_chan);
2127
2128 DBG2("UST app creating buffer registry channel for %s", ua_chan->name);
2129
2130 /* Create buffer registry channel. */
2131 ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, &reg_chan);
2132 if (ret < 0) {
2133 goto error_create;
421cb601 2134 }
7972aab2
DG
2135 assert(reg_chan);
2136 reg_chan->consumer_key = ua_chan->key;
8c924c7b 2137 reg_chan->subbuf_size = ua_chan->attr.subbuf_size;
421cb601 2138
7972aab2
DG
2139 /* Create and add a channel registry to session. */
2140 ret = ust_registry_channel_add(reg_sess->reg.ust,
2141 ua_chan->tracing_channel_id);
2142 if (ret < 0) {
2143 goto error;
d88aee68 2144 }
7972aab2 2145 buffer_reg_channel_add(reg_sess, reg_chan);
d88aee68 2146
7972aab2
DG
2147 if (regp) {
2148 *regp = reg_chan;
3d8ca23b 2149 }
d88aee68 2150
7972aab2 2151 return 0;
3d8ca23b
DG
2152
2153error:
7972aab2
DG
2154 /* Safe because the registry channel object was not added to any HT. */
2155 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
2156error_create:
3d8ca23b 2157 return ret;
421cb601
DG
2158}
2159
55cc08a6 2160/*
7972aab2
DG
2161 * Setup buffer registry channel for the given session registry and application
2162 * channel object. If regp pointer is valid, it's set with the created object.
d0b96690 2163 *
7972aab2 2164 * Return 0 on success else a negative value.
55cc08a6 2165 */
7972aab2
DG
2166static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess,
2167 struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan)
55cc08a6 2168{
7972aab2 2169 int ret;
55cc08a6 2170
7972aab2
DG
2171 assert(reg_sess);
2172 assert(reg_chan);
2173 assert(ua_chan);
2174 assert(ua_chan->obj);
55cc08a6 2175
7972aab2 2176 DBG2("UST app setup buffer registry channel for %s", ua_chan->name);
55cc08a6 2177
7972aab2
DG
2178 /* Setup all streams for the registry. */
2179 ret = setup_buffer_reg_streams(reg_chan, ua_chan);
2180 if (ret < 0) {
55cc08a6
DG
2181 goto error;
2182 }
2183
7972aab2
DG
2184 reg_chan->obj.ust = ua_chan->obj;
2185 ua_chan->obj = NULL;
55cc08a6 2186
7972aab2 2187 return 0;
55cc08a6
DG
2188
2189error:
7972aab2
DG
2190 buffer_reg_channel_remove(reg_sess, reg_chan);
2191 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
55cc08a6
DG
2192 return ret;
2193}
2194
edb67388 2195/*
7972aab2 2196 * Send buffer registry channel to the application.
d0b96690 2197 *
7972aab2 2198 * Return 0 on success else a negative value.
edb67388 2199 */
7972aab2
DG
2200static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan,
2201 struct ust_app *app, struct ust_app_session *ua_sess,
2202 struct ust_app_channel *ua_chan)
edb67388
DG
2203{
2204 int ret;
7972aab2 2205 struct buffer_reg_stream *reg_stream;
edb67388 2206
7972aab2
DG
2207 assert(reg_chan);
2208 assert(app);
2209 assert(ua_sess);
2210 assert(ua_chan);
2211
2212 DBG("UST app sending buffer registry channel to ust sock %d", app->sock);
2213
2214 ret = duplicate_channel_object(reg_chan, ua_chan);
edb67388
DG
2215 if (ret < 0) {
2216 goto error;
2217 }
2218
7972aab2
DG
2219 /* Send channel to the application. */
2220 ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
2221 if (ret < 0) {
2222 goto error;
2223 }
2224
2225 health_code_update();
2226
2227 /* Send all streams to application. */
2228 pthread_mutex_lock(&reg_chan->stream_list_lock);
2229 cds_list_for_each_entry(reg_stream, &reg_chan->streams, lnode) {
2230 struct ust_app_stream stream;
2231
2232 ret = duplicate_stream_object(reg_stream, &stream);
2233 if (ret < 0) {
2234 goto error_stream_unlock;
2235 }
2236
2237 ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream);
2238 if (ret < 0) {
8c067051 2239 (void) release_ust_app_stream(-1, &stream);
7972aab2
DG
2240 goto error_stream_unlock;
2241 }
edb67388 2242
7972aab2
DG
2243 /*
2244 * The return value is not important here. This function will output an
2245 * error if needed.
2246 */
2247 (void) release_ust_app_stream(-1, &stream);
2248 }
2249 ua_chan->is_sent = 1;
2250
2251error_stream_unlock:
2252 pthread_mutex_unlock(&reg_chan->stream_list_lock);
edb67388
DG
2253error:
2254 return ret;
2255}
2256
9730260e 2257/*
7972aab2
DG
2258 * Create and send to the application the created buffers with per UID buffers.
2259 *
2260 * Return 0 on success else a negative value.
9730260e 2261 */
7972aab2
DG
2262static int create_channel_per_uid(struct ust_app *app,
2263 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2264 struct ust_app_channel *ua_chan)
9730260e
DG
2265{
2266 int ret;
7972aab2
DG
2267 struct buffer_reg_uid *reg_uid;
2268 struct buffer_reg_channel *reg_chan;
9730260e 2269
7972aab2
DG
2270 assert(app);
2271 assert(usess);
2272 assert(ua_sess);
2273 assert(ua_chan);
2274
2275 DBG("UST app creating channel %s with per UID buffers", ua_chan->name);
2276
2277 reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid);
2278 /*
2279 * The session creation handles the creation of this global registry
2280 * object. If none can be find, there is a code flow problem or a
2281 * teardown race.
2282 */
2283 assert(reg_uid);
2284
2285 reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id,
2286 reg_uid);
2287 if (!reg_chan) {
2288 /* Create the buffer registry channel object. */
2289 ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, &reg_chan);
2290 if (ret < 0) {
2291 goto error;
2292 }
2293 assert(reg_chan);
2294
2295 /*
2296 * Create the buffers on the consumer side. This call populates the
2297 * ust app channel object with all streams and data object.
2298 */
2299 ret = do_consumer_create_channel(usess, ua_sess, ua_chan,
2300 app->bits_per_long, reg_uid->registry->reg.ust);
2301 if (ret < 0) {
07d2ae95
DG
2302 /*
2303 * Let's remove the previously created buffer registry channel so
2304 * it's not visible anymore in the session registry.
2305 */
2306 ust_registry_channel_del_free(reg_uid->registry->reg.ust,
2307 ua_chan->tracing_channel_id);
2308 buffer_reg_channel_remove(reg_uid->registry, reg_chan);
2309 buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST);
7972aab2
DG
2310 goto error;
2311 }
2312
2313 /*
2314 * Setup the streams and add it to the session registry.
2315 */
2316 ret = setup_buffer_reg_channel(reg_uid->registry, ua_chan, reg_chan);
2317 if (ret < 0) {
2318 goto error;
2319 }
2320
2321 }
2322
2323 /* Send buffers to the application. */
2324 ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan);
9730260e
DG
2325 if (ret < 0) {
2326 goto error;
2327 }
2328
9730260e
DG
2329error:
2330 return ret;
2331}
2332
78f0bacd 2333/*
7972aab2
DG
2334 * Create and send to the application the created buffers with per PID buffers.
2335 *
2336 * Return 0 on success else a negative value.
78f0bacd 2337 */
7972aab2
DG
2338static int create_channel_per_pid(struct ust_app *app,
2339 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2340 struct ust_app_channel *ua_chan)
78f0bacd 2341{
8535a6d9 2342 int ret;
7972aab2 2343 struct ust_registry_session *registry;
78f0bacd 2344
7972aab2
DG
2345 assert(app);
2346 assert(usess);
2347 assert(ua_sess);
2348 assert(ua_chan);
2349
2350 DBG("UST app creating channel %s with per PID buffers", ua_chan->name);
2351
2352 rcu_read_lock();
2353
2354 registry = get_session_registry(ua_sess);
2355 assert(registry);
2356
2357 /* Create and add a new channel registry to session. */
2358 ret = ust_registry_channel_add(registry, ua_chan->key);
78f0bacd
DG
2359 if (ret < 0) {
2360 goto error;
2361 }
2362
7972aab2
DG
2363 /* Create and get channel on the consumer side. */
2364 ret = do_consumer_create_channel(usess, ua_sess, ua_chan,
2365 app->bits_per_long, registry);
2366 if (ret < 0) {
2367 goto error;
2368 }
2369
2370 ret = send_channel_pid_to_ust(app, ua_sess, ua_chan);
2371 if (ret < 0) {
2372 goto error;
2373 }
8535a6d9 2374
78f0bacd 2375error:
7972aab2 2376 rcu_read_unlock();
78f0bacd
DG
2377 return ret;
2378}
2379
2380/*
7972aab2
DG
2381 * From an already allocated ust app channel, create the channel buffers if
2382 * need and send it to the application. This MUST be called with a RCU read
2383 * side lock acquired.
2384 *
2385 * Return 0 on success or else a negative value.
78f0bacd 2386 */
7972aab2
DG
2387static int do_create_channel(struct ust_app *app,
2388 struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
2389 struct ust_app_channel *ua_chan)
78f0bacd 2390{
7972aab2 2391 int ret;
78f0bacd 2392
7972aab2
DG
2393 assert(app);
2394 assert(usess);
2395 assert(ua_sess);
2396 assert(ua_chan);
2397
2398 /* Handle buffer type before sending the channel to the application. */
2399 switch (usess->buffer_type) {
2400 case LTTNG_BUFFER_PER_UID:
2401 {
2402 ret = create_channel_per_uid(app, usess, ua_sess, ua_chan);
2403 if (ret < 0) {
2404 goto error;
2405 }
2406 break;
2407 }
2408 case LTTNG_BUFFER_PER_PID:
2409 {
2410 ret = create_channel_per_pid(app, usess, ua_sess, ua_chan);
2411 if (ret < 0) {
2412 goto error;
2413 }
2414 break;
2415 }
2416 default:
2417 assert(0);
2418 ret = -EINVAL;
78f0bacd
DG
2419 goto error;
2420 }
2421
7972aab2
DG
2422 /* Initialize ust objd object using the received handle and add it. */
2423 lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle);
2424 lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node);
78f0bacd 2425
7972aab2
DG
2426 /* If channel is not enabled, disable it on the tracer */
2427 if (!ua_chan->enabled) {
2428 ret = disable_ust_channel(app, ua_sess, ua_chan);
2429 if (ret < 0) {
2430 goto error;
2431 }
78f0bacd
DG
2432 }
2433
2434error:
2435 return ret;
2436}
2437
284d8f55 2438/*
4d710ac2
DG
2439 * Create UST app channel and create it on the tracer. Set ua_chanp of the
2440 * newly created channel if not NULL.
d0b96690 2441 *
36b588ed 2442 * Called with UST app session lock and RCU read-side lock held.
7972aab2
DG
2443 *
2444 * Return 0 on success or else a negative value.
284d8f55 2445 */
4d710ac2
DG
2446static int create_ust_app_channel(struct ust_app_session *ua_sess,
2447 struct ltt_ust_channel *uchan, struct ust_app *app,
7972aab2 2448 enum lttng_ust_chan_type type, struct ltt_ust_session *usess,
4d710ac2 2449 struct ust_app_channel **ua_chanp)
5b4a0ec0
DG
2450{
2451 int ret = 0;
bec39940
DG
2452 struct lttng_ht_iter iter;
2453 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
2454 struct ust_app_channel *ua_chan;
2455
2456 /* Lookup channel in the ust app session */
bec39940
DG
2457 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2458 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
fc34caaa 2459 if (ua_chan_node != NULL) {
5b4a0ec0 2460 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
fc34caaa 2461 goto end;
5b4a0ec0
DG
2462 }
2463
d0b96690 2464 ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr);
fc34caaa
DG
2465 if (ua_chan == NULL) {
2466 /* Only malloc can fail here */
4d710ac2 2467 ret = -ENOMEM;
094d1690 2468 goto error_alloc;
fc34caaa
DG
2469 }
2470 shadow_copy_channel(ua_chan, uchan);
2471
ffe60014
DG
2472 /* Set channel type. */
2473 ua_chan->attr.type = type;
2474
7972aab2 2475 ret = do_create_channel(app, usess, ua_sess, ua_chan);
5b4a0ec0
DG
2476 if (ret < 0) {
2477 goto error;
2478 }
2479
fc34caaa 2480 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
852d0037 2481 app->pid);
fc34caaa 2482
d0b96690
DG
2483 /* Only add the channel if successful on the tracer side. */
2484 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
2485
fc34caaa 2486end:
4d710ac2
DG
2487 if (ua_chanp) {
2488 *ua_chanp = ua_chan;
2489 }
2490
2491 /* Everything went well. */
2492 return 0;
5b4a0ec0
DG
2493
2494error:
d0b96690 2495 delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app);
094d1690 2496error_alloc:
4d710ac2 2497 return ret;
5b4a0ec0
DG
2498}
2499
2500/*
2501 * Create UST app event and create it on the tracer side.
d0b96690
DG
2502 *
2503 * Called with ust app session mutex held.
5b4a0ec0 2504 */
edb67388
DG
2505static
2506int create_ust_app_event(struct ust_app_session *ua_sess,
2507 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
2508 struct ust_app *app)
284d8f55 2509{
edb67388 2510 int ret = 0;
5b4a0ec0 2511 struct ust_app_event *ua_event;
284d8f55 2512
5b4a0ec0 2513 /* Get event node */
18eace3b
DG
2514 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
2515 uevent->filter, uevent->attr.loglevel);
2516 if (ua_event != NULL) {
fc34caaa 2517 ret = -EEXIST;
edb67388
DG
2518 goto end;
2519 }
5b4a0ec0 2520
edb67388
DG
2521 /* Does not exist so create one */
2522 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
2523 if (ua_event == NULL) {
2524 /* Only malloc can failed so something is really wrong */
2525 ret = -ENOMEM;
fc34caaa 2526 goto end;
5b4a0ec0 2527 }
edb67388 2528 shadow_copy_event(ua_event, uevent);
5b4a0ec0 2529
edb67388 2530 /* Create it on the tracer side */
5b4a0ec0 2531 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 2532 if (ret < 0) {
fc34caaa 2533 /* Not found previously means that it does not exist on the tracer */
76f66f63 2534 assert(ret != -LTTNG_UST_ERR_EXIST);
284d8f55
DG
2535 goto error;
2536 }
2537
d0b96690 2538 add_unique_ust_app_event(ua_chan, ua_event);
284d8f55 2539
fc34caaa 2540 DBG2("UST app create event %s for PID %d completed", ua_event->name,
852d0037 2541 app->pid);
7f79d3a1 2542
edb67388 2543end:
fc34caaa
DG
2544 return ret;
2545
5b4a0ec0 2546error:
fc34caaa
DG
2547 /* Valid. Calling here is already in a read side lock */
2548 delete_ust_app_event(-1, ua_event);
edb67388 2549 return ret;
5b4a0ec0
DG
2550}
2551
2552/*
2553 * Create UST metadata and open it on the tracer side.
d0b96690 2554 *
7972aab2 2555 * Called with UST app session lock held and RCU read side lock.
5b4a0ec0
DG
2556 */
2557static int create_ust_app_metadata(struct ust_app_session *ua_sess,
d65d2de8
DG
2558 struct ust_app *app, struct consumer_output *consumer,
2559 struct ustctl_consumer_channel_attr *attr)
5b4a0ec0
DG
2560{
2561 int ret = 0;
ffe60014 2562 struct ust_app_channel *metadata;
d88aee68 2563 struct consumer_socket *socket;
7972aab2 2564 struct ust_registry_session *registry;
5b4a0ec0 2565
ffe60014
DG
2566 assert(ua_sess);
2567 assert(app);
d88aee68 2568 assert(consumer);
5b4a0ec0 2569
7972aab2
DG
2570 registry = get_session_registry(ua_sess);
2571 assert(registry);
2572
1b532a60
DG
2573 /* Metadata already exists for this registry or it was closed previously */
2574 if (registry->metadata_key || registry->metadata_closed) {
7972aab2
DG
2575 ret = 0;
2576 goto error;
5b4a0ec0
DG
2577 }
2578
ffe60014 2579 /* Allocate UST metadata */
d0b96690 2580 metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL);
ffe60014
DG
2581 if (!metadata) {
2582 /* malloc() failed */
2583 ret = -ENOMEM;
2584 goto error;
2585 }
5b4a0ec0 2586
d65d2de8
DG
2587 if (!attr) {
2588 /* Set default attributes for metadata. */
2589 metadata->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
2590 metadata->attr.subbuf_size = default_get_metadata_subbuf_size();
2591 metadata->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
0a9c6494
DG
2592 metadata->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER;
2593 metadata->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER;
d65d2de8
DG
2594 metadata->attr.output = LTTNG_UST_MMAP;
2595 metadata->attr.type = LTTNG_UST_CHAN_METADATA;
2596 } else {
2597 memcpy(&metadata->attr, attr, sizeof(metadata->attr));
2598 metadata->attr.output = LTTNG_UST_MMAP;
2599 metadata->attr.type = LTTNG_UST_CHAN_METADATA;
2600 }
5b4a0ec0 2601
7972aab2
DG
2602 /* Need one fd for the channel. */
2603 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2604 if (ret < 0) {
2605 ERR("Exhausted number of available FD upon create metadata");
2606 goto error;
2607 }
2608
4dc3dfc5
DG
2609 /* Get the right consumer socket for the application. */
2610 socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer);
2611 if (!socket) {
2612 ret = -EINVAL;
2613 goto error_consumer;
2614 }
2615
331744e3
JD
2616 /*
2617 * Keep metadata key so we can identify it on the consumer side. Assign it
2618 * to the registry *before* we ask the consumer so we avoid the race of the
2619 * consumer requesting the metadata and the ask_channel call on our side
2620 * did not returned yet.
2621 */
2622 registry->metadata_key = metadata->key;
2623
d88aee68
DG
2624 /*
2625 * Ask the metadata channel creation to the consumer. The metadata object
2626 * will be created by the consumer and kept their. However, the stream is
2627 * never added or monitored until we do a first push metadata to the
2628 * consumer.
2629 */
7972aab2
DG
2630 ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket,
2631 registry);
d88aee68 2632 if (ret < 0) {
f2a444f1
DG
2633 /* Nullify the metadata key so we don't try to close it later on. */
2634 registry->metadata_key = 0;
d88aee68
DG
2635 goto error_consumer;
2636 }
2637
2638 /*
2639 * The setup command will make the metadata stream be sent to the relayd,
2640 * if applicable, and the thread managing the metadatas. This is important
2641 * because after this point, if an error occurs, the only way the stream
2642 * can be deleted is to be monitored in the consumer.
2643 */
7972aab2 2644 ret = consumer_setup_metadata(socket, metadata->key);
ffe60014 2645 if (ret < 0) {
f2a444f1
DG
2646 /* Nullify the metadata key so we don't try to close it later on. */
2647 registry->metadata_key = 0;
d88aee68 2648 goto error_consumer;
5b4a0ec0
DG
2649 }
2650
7972aab2
DG
2651 DBG2("UST metadata with key %" PRIu64 " created for app pid %d",
2652 metadata->key, app->pid);
5b4a0ec0 2653
d88aee68 2654error_consumer:
b80f0b6c 2655 lttng_fd_put(LTTNG_FD_APPS, 1);
d88aee68 2656 delete_ust_app_channel(-1, metadata, app);
5b4a0ec0 2657error:
ffe60014 2658 return ret;
5b4a0ec0
DG
2659}
2660
2661/*
2662 * Return pointer to traceable apps list.
2663 */
bec39940 2664struct lttng_ht *ust_app_get_ht(void)
5b4a0ec0
DG
2665{
2666 return ust_app_ht;
2667}
2668
2669/*
d88aee68
DG
2670 * Return ust app pointer or NULL if not found. RCU read side lock MUST be
2671 * acquired before calling this function.
5b4a0ec0
DG
2672 */
2673struct ust_app *ust_app_find_by_pid(pid_t pid)
2674{
d88aee68 2675 struct ust_app *app = NULL;
bec39940
DG
2676 struct lttng_ht_node_ulong *node;
2677 struct lttng_ht_iter iter;
5b4a0ec0 2678
bec39940
DG
2679 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
2680 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
2681 if (node == NULL) {
2682 DBG2("UST app no found with pid %d", pid);
2683 goto error;
2684 }
5b4a0ec0
DG
2685
2686 DBG2("Found UST app by pid %d", pid);
2687
d88aee68 2688 app = caa_container_of(node, struct ust_app, pid_n);
5b4a0ec0
DG
2689
2690error:
d88aee68 2691 return app;
5b4a0ec0
DG
2692}
2693
d88aee68
DG
2694/*
2695 * Allocate and init an UST app object using the registration information and
2696 * the command socket. This is called when the command socket connects to the
2697 * session daemon.
2698 *
2699 * The object is returned on success or else NULL.
2700 */
d0b96690 2701struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock)
5b4a0ec0 2702{
d0b96690
DG
2703 struct ust_app *lta = NULL;
2704
2705 assert(msg);
2706 assert(sock >= 0);
2707
2708 DBG3("UST app creating application for socket %d", sock);
5b4a0ec0 2709
173af62f
DG
2710 if ((msg->bits_per_long == 64 &&
2711 (uatomic_read(&ust_consumerd64_fd) == -EINVAL))
2712 || (msg->bits_per_long == 32 &&
2713 (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) {
f943b0fb 2714 ERR("Registration failed: application \"%s\" (pid: %d) has "
d0b96690
DG
2715 "%d-bit long, but no consumerd for this size is available.\n",
2716 msg->name, msg->pid, msg->bits_per_long);
2717 goto error;
3f2c5fcc 2718 }
d0b96690 2719
5b4a0ec0
DG
2720 lta = zmalloc(sizeof(struct ust_app));
2721 if (lta == NULL) {
2722 PERROR("malloc");
d0b96690 2723 goto error;
5b4a0ec0
DG
2724 }
2725
2726 lta->ppid = msg->ppid;
2727 lta->uid = msg->uid;
2728 lta->gid = msg->gid;
d0b96690 2729
7753dea8 2730 lta->bits_per_long = msg->bits_per_long;
d0b96690
DG
2731 lta->uint8_t_alignment = msg->uint8_t_alignment;
2732 lta->uint16_t_alignment = msg->uint16_t_alignment;
2733 lta->uint32_t_alignment = msg->uint32_t_alignment;
2734 lta->uint64_t_alignment = msg->uint64_t_alignment;
2735 lta->long_alignment = msg->long_alignment;
2736 lta->byte_order = msg->byte_order;
2737
5b4a0ec0
DG
2738 lta->v_major = msg->major;
2739 lta->v_minor = msg->minor;
d9bf3ca4 2740 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
d0b96690
DG
2741 lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
2742 lta->notify_sock = -1;
d88aee68
DG
2743
2744 /* Copy name and make sure it's NULL terminated. */
2745 strncpy(lta->name, msg->name, sizeof(lta->name));
2746 lta->name[UST_APP_PROCNAME_LEN] = '\0';
2747
2748 /*
2749 * Before this can be called, when receiving the registration information,
2750 * the application compatibility is checked. So, at this point, the
2751 * application can work with this session daemon.
2752 */
d0b96690 2753 lta->compatible = 1;
5b4a0ec0 2754
852d0037 2755 lta->pid = msg->pid;
d0b96690 2756 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long) lta->pid);
852d0037 2757 lta->sock = sock;
d0b96690 2758 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long) lta->sock);
5b4a0ec0 2759
d42f20df
DG
2760 CDS_INIT_LIST_HEAD(&lta->teardown_head);
2761
d0b96690
DG
2762error:
2763 return lta;
2764}
2765
d88aee68
DG
2766/*
2767 * For a given application object, add it to every hash table.
2768 */
d0b96690
DG
2769void ust_app_add(struct ust_app *app)
2770{
2771 assert(app);
2772 assert(app->notify_sock >= 0);
2773
5b4a0ec0 2774 rcu_read_lock();
852d0037
DG
2775
2776 /*
2777 * On a re-registration, we want to kick out the previous registration of
2778 * that pid
2779 */
d0b96690 2780 lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n);
852d0037
DG
2781
2782 /*
2783 * The socket _should_ be unique until _we_ call close. So, a add_unique
2784 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
2785 * already in the table.
2786 */
d0b96690 2787 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n);
852d0037 2788
d0b96690
DG
2789 /* Add application to the notify socket hash table. */
2790 lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock);
2791 lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n);
5b4a0ec0 2792
d0b96690 2793 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s "
d88aee68
DG
2794 "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid,
2795 app->gid, app->sock, app->name, app->notify_sock, app->v_major,
2796 app->v_minor);
5b4a0ec0 2797
d0b96690
DG
2798 rcu_read_unlock();
2799}
2800
d88aee68
DG
2801/*
2802 * Set the application version into the object.
2803 *
2804 * Return 0 on success else a negative value either an errno code or a
2805 * LTTng-UST error code.
2806 */
d0b96690
DG
2807int ust_app_version(struct ust_app *app)
2808{
d88aee68
DG
2809 int ret;
2810
d0b96690 2811 assert(app);
d88aee68
DG
2812
2813 ret = ustctl_tracer_version(app->sock, &app->version);
2814 if (ret < 0) {
2815 if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
2816 ERR("UST app %d verson failed with ret %d", app->sock, ret);
2817 } else {
2818 DBG3("UST app %d verion failed. Application is dead", app->sock);
2819 }
2820 }
2821
2822 return ret;
5b4a0ec0
DG
2823}
2824
2825/*
2826 * Unregister app by removing it from the global traceable app list and freeing
2827 * the data struct.
2828 *
2829 * The socket is already closed at this point so no close to sock.
2830 */
2831void ust_app_unregister(int sock)
2832{
2833 struct ust_app *lta;
bec39940
DG
2834 struct lttng_ht_node_ulong *node;
2835 struct lttng_ht_iter iter;
d42f20df 2836 struct ust_app_session *ua_sess;
525b0740 2837 int ret;
5b4a0ec0
DG
2838
2839 rcu_read_lock();
886459c6 2840
5b4a0ec0 2841 /* Get the node reference for a call_rcu */
852d0037 2842 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 2843 node = lttng_ht_iter_get_node_ulong(&iter);
d0b96690 2844 assert(node);
284d8f55 2845
852d0037 2846 lta = caa_container_of(node, struct ust_app, sock_n);
852d0037
DG
2847 DBG("PID %d unregistering with sock %d", lta->pid, sock);
2848
886459c6 2849 /* Remove application from PID hash table */
852d0037
DG
2850 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
2851 assert(!ret);
2852
d88aee68
DG
2853 /*
2854 * Remove application from notify hash table. The thread handling the
2855 * notify socket could have deleted the node so ignore on error because
2856 * either way it's valid. The close of that socket is handled by the other
2857 * thread.
2858 */
d0b96690 2859 iter.iter.node = &lta->notify_sock_n.node;
d88aee68 2860 (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
852d0037 2861
5b98a774
DG
2862 /*
2863 * Ignore return value since the node might have been removed before by an
2864 * add replace during app registration because the PID can be reassigned by
2865 * the OS.
2866 */
d0b96690 2867 iter.iter.node = &lta->pid_n.node;
bec39940 2868 ret = lttng_ht_del(ust_app_ht, &iter);
5b98a774
DG
2869 if (ret) {
2870 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
2871 lta->pid);
2872 }
852d0037 2873
d42f20df
DG
2874 /* Remove sessions so they are not visible during deletion.*/
2875 cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess,
2876 node.node) {
7972aab2
DG
2877 struct ust_registry_session *registry;
2878
d42f20df
DG
2879 ret = lttng_ht_del(lta->sessions, &iter);
2880 if (ret) {
2881 /* The session was already removed so scheduled for teardown. */
2882 continue;
2883 }
2884
2885 /*
2886 * Add session to list for teardown. This is safe since at this point we
2887 * are the only one using this list.
2888 */
d88aee68
DG
2889 pthread_mutex_lock(&ua_sess->lock);
2890
2891 /*
2892 * Normally, this is done in the delete session process which is
2893 * executed in the call rcu below. However, upon registration we can't
2894 * afford to wait for the grace period before pushing data or else the
2895 * data pending feature can race between the unregistration and stop
2896 * command where the data pending command is sent *before* the grace
2897 * period ended.
2898 *
2899 * The close metadata below nullifies the metadata pointer in the
2900 * session so the delete session will NOT push/close a second time.
2901 */
7972aab2 2902 registry = get_session_registry(ua_sess);
1b532a60 2903 if (registry && !registry->metadata_closed) {
7972aab2
DG
2904 /* Push metadata for application before freeing the application. */
2905 (void) push_metadata(registry, ua_sess->consumer);
2906
2907 /*
2908 * Don't ask to close metadata for global per UID buffers. Close
1b532a60
DG
2909 * metadata only on destroy trace session in this case. Also, the
2910 * previous push metadata could have flag the metadata registry to
2911 * close so don't send a close command if closed.
7972aab2 2912 */
1b532a60
DG
2913 if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID &&
2914 !registry->metadata_closed) {
7972aab2
DG
2915 /* And ask to close it for this session registry. */
2916 (void) close_metadata(registry, ua_sess->consumer);
2917 }
2918 }
d88aee68 2919
d42f20df 2920 cds_list_add(&ua_sess->teardown_node, &lta->teardown_head);
d88aee68 2921 pthread_mutex_unlock(&ua_sess->lock);
d42f20df
DG
2922 }
2923
852d0037
DG
2924 /* Free memory */
2925 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
2926
5b4a0ec0
DG
2927 rcu_read_unlock();
2928 return;
284d8f55
DG
2929}
2930
2931/*
5b4a0ec0 2932 * Return traceable_app_count
284d8f55 2933 */
5b4a0ec0 2934unsigned long ust_app_list_count(void)
284d8f55 2935{
5b4a0ec0 2936 unsigned long count;
284d8f55 2937
5b4a0ec0 2938 rcu_read_lock();
bec39940 2939 count = lttng_ht_get_count(ust_app_ht);
5b4a0ec0 2940 rcu_read_unlock();
284d8f55 2941
5b4a0ec0 2942 return count;
284d8f55
DG
2943}
2944
5b4a0ec0
DG
2945/*
2946 * Fill events array with all events name of all registered apps.
2947 */
2948int ust_app_list_events(struct lttng_event **events)
421cb601 2949{
5b4a0ec0
DG
2950 int ret, handle;
2951 size_t nbmem, count = 0;
bec39940 2952 struct lttng_ht_iter iter;
5b4a0ec0 2953 struct ust_app *app;
c617c0c6 2954 struct lttng_event *tmp_event;
421cb601 2955
5b4a0ec0 2956 nbmem = UST_APP_EVENT_LIST_SIZE;
c617c0c6
MD
2957 tmp_event = zmalloc(nbmem * sizeof(struct lttng_event));
2958 if (tmp_event == NULL) {
5b4a0ec0
DG
2959 PERROR("zmalloc ust app events");
2960 ret = -ENOMEM;
421cb601
DG
2961 goto error;
2962 }
2963
5b4a0ec0 2964 rcu_read_lock();
421cb601 2965
852d0037 2966 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
90eaa0d2 2967 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 2968
840cb59c 2969 health_code_update();
86acf0da 2970
e0c7ec2b
DG
2971 if (!app->compatible) {
2972 /*
2973 * TODO: In time, we should notice the caller of this error by
2974 * telling him that this is a version error.
2975 */
2976 continue;
2977 }
852d0037 2978 handle = ustctl_tracepoint_list(app->sock);
5b4a0ec0 2979 if (handle < 0) {
ffe60014
DG
2980 if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) {
2981 ERR("UST app list events getting handle failed for app pid %d",
2982 app->pid);
2983 }
5b4a0ec0
DG
2984 continue;
2985 }
421cb601 2986
852d0037 2987 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
fb54cdbf 2988 &uiter)) != -LTTNG_UST_ERR_NOENT) {
ffe60014
DG
2989 /* Handle ustctl error. */
2990 if (ret < 0) {
2991 free(tmp_event);
2992 if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) {
2993 ERR("UST app tp list get failed for app %d with ret %d",
2994 app->sock, ret);
2995 } else {
2996 DBG3("UST app tp list get failed. Application is dead");
2997 }
2998 goto rcu_error;
2999 }
3000
840cb59c 3001 health_code_update();
815564d8 3002 if (count >= nbmem) {
d7b3776f 3003 /* In case the realloc fails, we free the memory */
c617c0c6
MD
3004 void *ptr;
3005
815564d8
MD
3006 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
3007 2 * nbmem);
3008 nbmem *= 2;
c617c0c6
MD
3009 ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event));
3010 if (ptr == NULL) {
5b4a0ec0 3011 PERROR("realloc ust app events");
c617c0c6 3012 free(tmp_event);
5b4a0ec0
DG
3013 ret = -ENOMEM;
3014 goto rcu_error;
3015 }
c617c0c6 3016 tmp_event = ptr;
5b4a0ec0 3017 }
c617c0c6
MD
3018 memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
3019 tmp_event[count].loglevel = uiter.loglevel;
3020 tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
3021 tmp_event[count].pid = app->pid;
3022 tmp_event[count].enabled = -1;
5b4a0ec0 3023 count++;
421cb601 3024 }
421cb601
DG
3025 }
3026
5b4a0ec0 3027 ret = count;
c617c0c6 3028 *events = tmp_event;
421cb601 3029
5b4a0ec0 3030 DBG2("UST app list events done (%zu events)", count);
421cb601 3031
5b4a0ec0
DG
3032rcu_error:
3033 rcu_read_unlock();
421cb601 3034error:
840cb59c 3035 health_code_update();
5b4a0ec0 3036 return ret;
421cb601
DG
3037}
3038
f37d259d
MD
3039/*
3040 * Fill events array with all events name of all registered apps.
3041 */
3042int ust_app_list_event_fields(struct lttng_event_field **fields)
3043{
3044 int ret, handle;
3045 size_t nbmem, count = 0;
3046 struct lttng_ht_iter iter;
3047 struct ust_app *app;
c617c0c6 3048 struct lttng_event_field *tmp_event;
f37d259d
MD
3049
3050 nbmem = UST_APP_EVENT_LIST_SIZE;
c617c0c6
MD
3051 tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field));
3052 if (tmp_event == NULL) {
f37d259d
MD
3053 PERROR("zmalloc ust app event fields");
3054 ret = -ENOMEM;
3055 goto error;
3056 }
3057
3058 rcu_read_lock();
3059
3060 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
3061 struct lttng_ust_field_iter uiter;
3062
840cb59c 3063 health_code_update();
86acf0da 3064
f37d259d
MD
3065 if (!app->compatible) {
3066 /*
3067 * TODO: In time, we should notice the caller of this error by
3068 * telling him that this is a version error.
3069 */
3070 continue;
3071 }
3072 handle = ustctl_tracepoint_field_list(app->sock);
3073 if (handle < 0) {
ffe60014
DG
3074 if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) {
3075 ERR("UST app list field getting handle failed for app pid %d",
3076 app->pid);
3077 }
f37d259d
MD
3078 continue;
3079 }
3080
3081 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
fb54cdbf 3082 &uiter)) != -LTTNG_UST_ERR_NOENT) {
ffe60014
DG
3083 /* Handle ustctl error. */
3084 if (ret < 0) {
3085 free(tmp_event);
3086 if (ret != -LTTNG_UST_ERR_EXITING || ret != -EPIPE) {
3087 ERR("UST app tp list field failed for app %d with ret %d",
3088 app->sock, ret);
3089 } else {
3090 DBG3("UST app tp list field failed. Application is dead");
3091 }
3092 goto rcu_error;
3093 }
3094
840cb59c 3095 health_code_update();
f37d259d 3096 if (count >= nbmem) {
d7b3776f 3097 /* In case the realloc fails, we free the memory */
c617c0c6
MD
3098 void *ptr;
3099
f37d259d
MD
3100 DBG2("Reallocating event field list from %zu to %zu entries", nbmem,
3101 2 * nbmem);
3102 nbmem *= 2;
c617c0c6
MD
3103 ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field));
3104 if (ptr == NULL) {
f37d259d 3105 PERROR("realloc ust app event fields");
c617c0c6 3106 free(tmp_event);
f37d259d
MD
3107 ret = -ENOMEM;
3108 goto rcu_error;
3109 }
c617c0c6 3110 tmp_event = ptr;
f37d259d 3111 }
f37d259d 3112
c617c0c6
MD
3113 memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
3114 tmp_event[count].type = uiter.type;
3115 tmp_event[count].nowrite = uiter.nowrite;
f37d259d 3116
c617c0c6
MD
3117 memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
3118 tmp_event[count].event.loglevel = uiter.loglevel;
3119 tmp_event[count].event.type = LTTNG_UST_TRACEPOINT;
3120 tmp_event[count].event.pid = app->pid;
3121 tmp_event[count].event.enabled = -1;
f37d259d
MD
3122 count++;
3123 }
3124 }
3125
3126 ret = count;
c617c0c6 3127 *fields = tmp_event;
f37d259d
MD
3128
3129 DBG2("UST app list event fields done (%zu events)", count);
3130
3131rcu_error:
3132 rcu_read_unlock();
3133error:
840cb59c 3134 health_code_update();
f37d259d
MD
3135 return ret;
3136}
3137
5b4a0ec0
DG
3138/*
3139 * Free and clean all traceable apps of the global list.
36b588ed
MD
3140 *
3141 * Should _NOT_ be called with RCU read-side lock held.
5b4a0ec0
DG
3142 */
3143void ust_app_clean_list(void)
421cb601 3144{
5b4a0ec0 3145 int ret;
659ed79f 3146 struct ust_app *app;
bec39940 3147 struct lttng_ht_iter iter;
421cb601 3148
5b4a0ec0 3149 DBG2("UST app cleaning registered apps hash table");
421cb601 3150
5b4a0ec0 3151 rcu_read_lock();
421cb601 3152
659ed79f 3153 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 3154 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 3155 assert(!ret);
659ed79f 3156 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
421cb601
DG
3157 }
3158
852d0037 3159 /* Cleanup socket hash table */
659ed79f
DG
3160 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app,
3161 sock_n.node) {
852d0037 3162 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
bec39940
DG
3163 assert(!ret);
3164 }
852d0037 3165
d88aee68
DG
3166 /* Cleanup notify socket hash table */
3167 cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app,
3168 notify_sock_n.node) {
3169 ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
3170 assert(!ret);
3171 }
36b588ed 3172 rcu_read_unlock();
d88aee68 3173
bec39940 3174 /* Destroy is done only when the ht is empty */
0b2dc8df
MD
3175 ht_cleanup_push(ust_app_ht);
3176 ht_cleanup_push(ust_app_ht_by_sock);
3177 ht_cleanup_push(ust_app_ht_by_notify_sock);
5b4a0ec0
DG
3178}
3179
3180/*
3181 * Init UST app hash table.
3182 */
3183void ust_app_ht_alloc(void)
3184{
bec39940 3185 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
852d0037 3186 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
d0b96690 3187 ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
421cb601
DG
3188}
3189
78f0bacd
DG
3190/*
3191 * For a specific UST session, disable the channel for all registered apps.
3192 */
35a9059d 3193int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
3194 struct ltt_ust_channel *uchan)
3195{
3196 int ret = 0;
bec39940
DG
3197 struct lttng_ht_iter iter;
3198 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
3199 struct ust_app *app;
3200 struct ust_app_session *ua_sess;
8535a6d9 3201 struct ust_app_channel *ua_chan;
78f0bacd
DG
3202
3203 if (usess == NULL || uchan == NULL) {
3204 ERR("Disabling UST global channel with NULL values");
3205 ret = -1;
3206 goto error;
3207 }
3208
d9bf3ca4 3209 DBG2("UST app disabling channel %s from global domain for session id %" PRIu64,
a991f516 3210 uchan->name, usess->id);
78f0bacd
DG
3211
3212 rcu_read_lock();
3213
3214 /* For every registered applications */
852d0037 3215 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 3216 struct lttng_ht_iter uiter;
e0c7ec2b
DG
3217 if (!app->compatible) {
3218 /*
3219 * TODO: In time, we should notice the caller of this error by
3220 * telling him that this is a version error.
3221 */
3222 continue;
3223 }
78f0bacd
DG
3224 ua_sess = lookup_session_by_app(usess, app);
3225 if (ua_sess == NULL) {
3226 continue;
3227 }
3228
8535a6d9 3229 /* Get channel */
bec39940
DG
3230 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
3231 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9
DG
3232 /* If the session if found for the app, the channel must be there */
3233 assert(ua_chan_node);
3234
3235 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
3236 /* The channel must not be already disabled */
3237 assert(ua_chan->enabled == 1);
3238
3239 /* Disable channel onto application */
3240 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
3241 if (ret < 0) {
3242 /* XXX: We might want to report this error at some point... */
3243 continue;
3244 }
3245 }
3246
3247 rcu_read_unlock();
3248
3249error:
3250 return ret;
3251}
3252
3253/*
3254 * For a specific UST session, enable the channel for all registered apps.
3255 */
35a9059d 3256int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
3257 struct ltt_ust_channel *uchan)
3258{
3259 int ret = 0;
bec39940 3260 struct lttng_ht_iter iter;
78f0bacd
DG
3261 struct ust_app *app;
3262 struct ust_app_session *ua_sess;
3263
3264 if (usess == NULL || uchan == NULL) {
3265 ERR("Adding UST global channel to NULL values");
3266 ret = -1;
3267 goto error;
3268 }
3269
d9bf3ca4 3270 DBG2("UST app enabling channel %s to global domain for session id %" PRIu64,
a991f516 3271 uchan->name, usess->id);
78f0bacd
DG
3272
3273 rcu_read_lock();
3274
3275 /* For every registered applications */
852d0037 3276 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
3277 if (!app->compatible) {
3278 /*
3279 * TODO: In time, we should notice the caller of this error by
3280 * telling him that this is a version error.
3281 */
3282 continue;
3283 }
78f0bacd
DG
3284 ua_sess = lookup_session_by_app(usess, app);
3285 if (ua_sess == NULL) {
3286 continue;
3287 }
3288
3289 /* Enable channel onto application */
3290 ret = enable_ust_app_channel(ua_sess, uchan, app);
3291 if (ret < 0) {
3292 /* XXX: We might want to report this error at some point... */
3293 continue;
3294 }
3295 }
3296
3297 rcu_read_unlock();
3298
3299error:
3300 return ret;
3301}