Fix: truncate the metadata file in shm-path
[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
CommitLineData
2f77fc4b
DG
1/*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
bdf64013 3 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
2f77fc4b
DG
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License, version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 51
16 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
6c1c0768 19#define _LGPL_SOURCE
2f77fc4b 20#include <assert.h>
6dc3064a 21#include <inttypes.h>
2f77fc4b
DG
22#include <urcu/list.h>
23#include <urcu/uatomic.h>
24
25#include <common/defaults.h>
26#include <common/common.h>
27#include <common/sessiond-comm/sessiond-comm.h>
28#include <common/relayd/relayd.h>
10a50311 29#include <common/utils.h>
f5436bfc 30#include <common/compat/string.h>
93ec662e 31#include <common/kernel-ctl/kernel-ctl.h>
2f77fc4b
DG
32
33#include "channel.h"
34#include "consumer.h"
35#include "event.h"
8782cc74 36#include "health-sessiond.h"
2f77fc4b
DG
37#include "kernel.h"
38#include "kernel-consumer.h"
39#include "lttng-sessiond.h"
40#include "utils.h"
834978fd 41#include "syscall.h"
7c1d2758 42#include "agent.h"
93ec662e 43#include "buffer-registry.h"
2f77fc4b
DG
44
45#include "cmd.h"
46
47/*
48 * Used to keep a unique index for each relayd socket created where this value
49 * is associated with streams on the consumer so it can match the right relayd
d88aee68
DG
50 * to send to. It must be accessed with the relayd_net_seq_idx_lock
51 * held.
2f77fc4b 52 */
d88aee68
DG
53static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
54static uint64_t relayd_net_seq_idx;
2f77fc4b 55
7076b56e
JG
56static int validate_event_name(const char *);
57static int validate_ust_event_name(const char *);
58static int cmd_enable_event_internal(struct ltt_session *session,
59 struct lttng_domain *domain,
60 char *channel_name, struct lttng_event *event,
61 char *filter_expression,
62 struct lttng_filter_bytecode *filter,
63 struct lttng_event_exclusion *exclusion,
64 int wpipe);
65
2f77fc4b
DG
66/*
67 * Create a session path used by list_lttng_sessions for the case that the
68 * session consumer is on the network.
69 */
70static int build_network_session_path(char *dst, size_t size,
71 struct ltt_session *session)
72{
73 int ret, kdata_port, udata_port;
74 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
75 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
76
77 assert(session);
78 assert(dst);
79
80 memset(tmp_urls, 0, sizeof(tmp_urls));
81 memset(tmp_uurl, 0, sizeof(tmp_uurl));
82
83 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
84
85 if (session->kernel_session && session->kernel_session->consumer) {
86 kuri = &session->kernel_session->consumer->dst.net.control;
87 kdata_port = session->kernel_session->consumer->dst.net.data.port;
88 }
89
90 if (session->ust_session && session->ust_session->consumer) {
91 uuri = &session->ust_session->consumer->dst.net.control;
92 udata_port = session->ust_session->consumer->dst.net.data.port;
93 }
94
95 if (uuri == NULL && kuri == NULL) {
96 uri = &session->consumer->dst.net.control;
97 kdata_port = session->consumer->dst.net.data.port;
98 } else if (kuri && uuri) {
99 ret = uri_compare(kuri, uuri);
100 if (ret) {
101 /* Not Equal */
102 uri = kuri;
103 /* Build uuri URL string */
104 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
105 if (ret < 0) {
106 goto error;
107 }
108 } else {
109 uri = kuri;
110 }
111 } else if (kuri && uuri == NULL) {
112 uri = kuri;
113 } else if (uuri && kuri == NULL) {
114 uri = uuri;
115 }
116
117 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
118 if (ret < 0) {
119 goto error;
120 }
121
9aa9f900
DG
122 /*
123 * Do we have a UST url set. If yes, this means we have both kernel and UST
124 * to print.
125 */
9d035200 126 if (*tmp_uurl != '\0') {
2f77fc4b
DG
127 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
128 tmp_urls, kdata_port, tmp_uurl, udata_port);
129 } else {
9aa9f900 130 int dport;
bef08707 131 if (kuri || (!kuri && !uuri)) {
9aa9f900
DG
132 dport = kdata_port;
133 } else {
134 /* No kernel URI, use the UST port. */
135 dport = udata_port;
136 }
137 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
2f77fc4b
DG
138 }
139
140error:
141 return ret;
142}
143
fb83fe64
JD
144/*
145 * Get run-time attributes if the session has been started (discarded events,
146 * lost packets).
147 */
148static int get_kernel_runtime_stats(struct ltt_session *session,
149 struct ltt_kernel_channel *kchan, uint64_t *discarded_events,
150 uint64_t *lost_packets)
151{
152 int ret;
153
154 if (!session->has_been_started) {
155 ret = 0;
156 *discarded_events = 0;
157 *lost_packets = 0;
158 goto end;
159 }
160
161 ret = consumer_get_discarded_events(session->id, kchan->fd,
162 session->kernel_session->consumer,
163 discarded_events);
164 if (ret < 0) {
165 goto end;
166 }
167
168 ret = consumer_get_lost_packets(session->id, kchan->fd,
169 session->kernel_session->consumer,
170 lost_packets);
171 if (ret < 0) {
172 goto end;
173 }
174
175end:
176 return ret;
177}
178
179/*
180 * Get run-time attributes if the session has been started (discarded events,
181 * lost packets).
182 */
183static int get_ust_runtime_stats(struct ltt_session *session,
184 struct ltt_ust_channel *uchan, uint64_t *discarded_events,
185 uint64_t *lost_packets)
186{
187 int ret;
188 struct ltt_ust_session *usess;
189
a91c5803
JG
190 if (!discarded_events || !lost_packets) {
191 ret = -1;
192 goto end;
193 }
194
fb83fe64 195 usess = session->ust_session;
a905c624
JG
196 assert(discarded_events);
197 assert(lost_packets);
fb83fe64
JD
198
199 if (!usess || !session->has_been_started) {
200 *discarded_events = 0;
201 *lost_packets = 0;
202 ret = 0;
203 goto end;
204 }
205
206 if (usess->buffer_type == LTTNG_BUFFER_PER_UID) {
207 ret = ust_app_uid_get_channel_runtime_stats(usess->id,
208 &usess->buffer_reg_uid_list,
209 usess->consumer, uchan->id,
210 uchan->attr.overwrite,
211 discarded_events,
212 lost_packets);
213 } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) {
214 ret = ust_app_pid_get_channel_runtime_stats(usess,
215 uchan, usess->consumer,
216 uchan->attr.overwrite,
217 discarded_events,
218 lost_packets);
219 if (ret < 0) {
220 goto end;
221 }
222 *discarded_events += uchan->per_pid_closed_app_discarded;
223 *lost_packets += uchan->per_pid_closed_app_lost;
224 } else {
225 ERR("Unsupported buffer type");
967bc289 226 assert(0);
fb83fe64
JD
227 ret = -1;
228 goto end;
229 }
230
231end:
232 return ret;
233}
234
2f77fc4b
DG
235/*
236 * Fill lttng_channel array of all channels.
237 */
56a37563 238static void list_lttng_channels(enum lttng_domain_type domain,
fb83fe64
JD
239 struct ltt_session *session, struct lttng_channel *channels,
240 struct lttcomm_channel_extended *chan_exts)
2f77fc4b 241{
fb83fe64 242 int i = 0, ret;
2f77fc4b
DG
243 struct ltt_kernel_channel *kchan;
244
245 DBG("Listing channels for session %s", session->name);
246
247 switch (domain) {
248 case LTTNG_DOMAIN_KERNEL:
249 /* Kernel channels */
250 if (session->kernel_session != NULL) {
251 cds_list_for_each_entry(kchan,
252 &session->kernel_session->channel_list.head, list) {
fb83fe64
JD
253 uint64_t discarded_events, lost_packets;
254
255 ret = get_kernel_runtime_stats(session, kchan,
256 &discarded_events, &lost_packets);
257 if (ret < 0) {
258 goto end;
259 }
2f77fc4b
DG
260 /* Copy lttng_channel struct to array */
261 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
262 channels[i].enabled = kchan->enabled;
fb83fe64
JD
263 chan_exts[i].discarded_events =
264 discarded_events;
265 chan_exts[i].lost_packets = lost_packets;
2f77fc4b
DG
266 i++;
267 }
268 }
269 break;
270 case LTTNG_DOMAIN_UST:
271 {
272 struct lttng_ht_iter iter;
273 struct ltt_ust_channel *uchan;
274
e7fe706f 275 rcu_read_lock();
2f77fc4b
DG
276 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
277 &iter.iter, uchan, node.node) {
a91c5803 278 uint64_t discarded_events = 0, lost_packets = 0;
fb83fe64 279
8ee609c8
MD
280 if (lttng_strncpy(channels[i].name, uchan->name,
281 LTTNG_SYMBOL_NAME_LEN)) {
282 break;
283 }
2f77fc4b
DG
284 channels[i].attr.overwrite = uchan->attr.overwrite;
285 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
286 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
287 channels[i].attr.switch_timer_interval =
288 uchan->attr.switch_timer_interval;
289 channels[i].attr.read_timer_interval =
290 uchan->attr.read_timer_interval;
291 channels[i].enabled = uchan->enabled;
2f785fe7
DG
292 channels[i].attr.tracefile_size = uchan->tracefile_size;
293 channels[i].attr.tracefile_count = uchan->tracefile_count;
5e4435a4
JG
294
295 /*
296 * Map enum lttng_ust_output to enum lttng_event_output.
297 */
2f77fc4b
DG
298 switch (uchan->attr.output) {
299 case LTTNG_UST_MMAP:
2f77fc4b
DG
300 channels[i].attr.output = LTTNG_EVENT_MMAP;
301 break;
5e4435a4
JG
302 default:
303 /*
304 * LTTNG_UST_MMAP is the only supported UST
305 * output mode.
306 */
307 assert(0);
308 break;
2f77fc4b 309 }
fb83fe64
JD
310
311 ret = get_ust_runtime_stats(session, uchan,
312 &discarded_events, &lost_packets);
313 if (ret < 0) {
314 break;
315 }
316 chan_exts[i].discarded_events = discarded_events;
317 chan_exts[i].lost_packets = lost_packets;
2f77fc4b
DG
318 i++;
319 }
e7fe706f 320 rcu_read_unlock();
2f77fc4b
DG
321 break;
322 }
323 default:
324 break;
325 }
fb83fe64
JD
326
327end:
328 return;
2f77fc4b
DG
329}
330
b4e3ceb9 331static void increment_extended_len(const char *filter_expression,
795d57ce 332 struct lttng_event_exclusion *exclusion, size_t *extended_len)
b4e3ceb9
PP
333{
334 *extended_len += sizeof(struct lttcomm_event_extended_header);
335
336 if (filter_expression) {
337 *extended_len += strlen(filter_expression) + 1;
338 }
795d57ce
PP
339
340 if (exclusion) {
341 *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN;
342 }
b4e3ceb9
PP
343}
344
345static void append_extended_info(const char *filter_expression,
795d57ce 346 struct lttng_event_exclusion *exclusion, void **extended_at)
b4e3ceb9
PP
347{
348 struct lttcomm_event_extended_header extended_header;
349 size_t filter_len = 0;
795d57ce 350 size_t nb_exclusions = 0;
b4e3ceb9
PP
351
352 if (filter_expression) {
353 filter_len = strlen(filter_expression) + 1;
354 }
355
795d57ce
PP
356 if (exclusion) {
357 nb_exclusions = exclusion->count;
358 }
359
360 /* Set header fields */
b4e3ceb9 361 extended_header.filter_len = filter_len;
795d57ce
PP
362 extended_header.nb_exclusions = nb_exclusions;
363
364 /* Copy header */
b4e3ceb9
PP
365 memcpy(*extended_at, &extended_header, sizeof(extended_header));
366 *extended_at += sizeof(extended_header);
795d57ce
PP
367
368 /* Copy filter string */
369 if (filter_expression) {
370 memcpy(*extended_at, filter_expression, filter_len);
371 *extended_at += filter_len;
372 }
373
374 /* Copy exclusion names */
375 if (exclusion) {
376 size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
377
378 memcpy(*extended_at, &exclusion->names, len);
379 *extended_at += len;
380 }
b4e3ceb9
PP
381}
382
3c6a091f 383/*
022d91ba 384 * Create a list of agent domain events.
3c6a091f
DG
385 *
386 * Return number of events in list on success or else a negative value.
387 */
022d91ba 388static int list_lttng_agent_events(struct agent *agt,
b4e3ceb9 389 struct lttng_event **events, size_t *total_size)
3c6a091f
DG
390{
391 int i = 0, ret = 0;
392 unsigned int nb_event = 0;
022d91ba 393 struct agent_event *event;
3c6a091f
DG
394 struct lttng_event *tmp_events;
395 struct lttng_ht_iter iter;
b4e3ceb9
PP
396 size_t extended_len = 0;
397 void *extended_at;
3c6a091f 398
022d91ba 399 assert(agt);
3c6a091f
DG
400 assert(events);
401
022d91ba 402 DBG3("Listing agent events");
3c6a091f 403
e5bbf678 404 rcu_read_lock();
022d91ba 405 nb_event = lttng_ht_get_count(agt->events);
e5bbf678 406 rcu_read_unlock();
3c6a091f
DG
407 if (nb_event == 0) {
408 ret = nb_event;
b4e3ceb9 409 *total_size = 0;
3c6a091f
DG
410 goto error;
411 }
412
b4e3ceb9
PP
413 /* Compute required extended infos size */
414 extended_len = nb_event * sizeof(struct lttcomm_event_extended_header);
415
416 /*
417 * This is only valid because the commands which add events are
418 * processed in the same thread as the listing.
419 */
420 rcu_read_lock();
421 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
795d57ce
PP
422 increment_extended_len(event->filter_expression, NULL,
423 &extended_len);
b4e3ceb9
PP
424 }
425 rcu_read_unlock();
426
427 *total_size = nb_event * sizeof(*tmp_events) + extended_len;
428 tmp_events = zmalloc(*total_size);
3c6a091f 429 if (!tmp_events) {
022d91ba 430 PERROR("zmalloc agent events session");
3c6a091f
DG
431 ret = -LTTNG_ERR_FATAL;
432 goto error;
433 }
434
b4e3ceb9
PP
435 extended_at = ((uint8_t *) tmp_events) +
436 nb_event * sizeof(struct lttng_event);
437
3c6a091f 438 rcu_read_lock();
022d91ba 439 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
3c6a091f
DG
440 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
441 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
442 tmp_events[i].enabled = event->enabled;
2106efa0 443 tmp_events[i].loglevel = event->loglevel_value;
ff94328f 444 tmp_events[i].loglevel_type = event->loglevel_type;
3c6a091f 445 i++;
b4e3ceb9
PP
446
447 /* Append extended info */
795d57ce
PP
448 append_extended_info(event->filter_expression, NULL,
449 &extended_at);
3c6a091f
DG
450 }
451 rcu_read_unlock();
452
453 *events = tmp_events;
454 ret = nb_event;
455
456error:
457 assert(nb_event == i);
458 return ret;
459}
460
2f77fc4b
DG
461/*
462 * Create a list of ust global domain events.
463 */
464static int list_lttng_ust_global_events(char *channel_name,
b4e3ceb9
PP
465 struct ltt_ust_domain_global *ust_global,
466 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
467{
468 int i = 0, ret = 0;
469 unsigned int nb_event = 0;
470 struct lttng_ht_iter iter;
471 struct lttng_ht_node_str *node;
472 struct ltt_ust_channel *uchan;
473 struct ltt_ust_event *uevent;
474 struct lttng_event *tmp;
b4e3ceb9
PP
475 size_t extended_len = 0;
476 void *extended_at;
2f77fc4b
DG
477
478 DBG("Listing UST global events for channel %s", channel_name);
479
480 rcu_read_lock();
481
482 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
483 node = lttng_ht_iter_get_node_str(&iter);
484 if (node == NULL) {
f73fabfd 485 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
d31d3e8c 486 goto end;
2f77fc4b
DG
487 }
488
489 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
490
3c442be3 491 nb_event = lttng_ht_get_count(uchan->events);
2f77fc4b
DG
492 if (nb_event == 0) {
493 ret = nb_event;
b4e3ceb9 494 *total_size = 0;
d31d3e8c 495 goto end;
2f77fc4b
DG
496 }
497
498 DBG3("Listing UST global %d events", nb_event);
499
b4e3ceb9
PP
500 /* Compute required extended infos size */
501 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
502 if (uevent->internal) {
503 nb_event--;
504 continue;
505 }
506
507 increment_extended_len(uevent->filter_expression,
795d57ce 508 uevent->exclusion, &extended_len);
b4e3ceb9 509 }
d31d3e8c
PP
510 if (nb_event == 0) {
511 /* All events are internal, skip. */
512 ret = 0;
513 *total_size = 0;
514 goto end;
515 }
b4e3ceb9
PP
516
517 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
518 tmp = zmalloc(*total_size);
2f77fc4b 519 if (tmp == NULL) {
b12c38df
JG
520 ret = -LTTNG_ERR_FATAL;
521 goto end;
2f77fc4b
DG
522 }
523
b4e3ceb9
PP
524 extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event);
525
2f77fc4b 526 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
3c442be3
JG
527 if (uevent->internal) {
528 /* This event should remain hidden from clients */
3c442be3
JG
529 continue;
530 }
2f77fc4b
DG
531 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
532 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
533 tmp[i].enabled = uevent->enabled;
534
535 switch (uevent->attr.instrumentation) {
536 case LTTNG_UST_TRACEPOINT:
537 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
538 break;
539 case LTTNG_UST_PROBE:
540 tmp[i].type = LTTNG_EVENT_PROBE;
541 break;
542 case LTTNG_UST_FUNCTION:
543 tmp[i].type = LTTNG_EVENT_FUNCTION;
544 break;
545 }
546
547 tmp[i].loglevel = uevent->attr.loglevel;
548 switch (uevent->attr.loglevel_type) {
549 case LTTNG_UST_LOGLEVEL_ALL:
550 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
551 break;
552 case LTTNG_UST_LOGLEVEL_RANGE:
553 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
554 break;
555 case LTTNG_UST_LOGLEVEL_SINGLE:
556 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
557 break;
558 }
559 if (uevent->filter) {
560 tmp[i].filter = 1;
561 }
4634f12e
JI
562 if (uevent->exclusion) {
563 tmp[i].exclusion = 1;
564 }
2f77fc4b 565 i++;
b4e3ceb9
PP
566
567 /* Append extended info */
795d57ce
PP
568 append_extended_info(uevent->filter_expression,
569 uevent->exclusion, &extended_at);
2f77fc4b
DG
570 }
571
572 ret = nb_event;
573 *events = tmp;
d31d3e8c 574end:
2f77fc4b
DG
575 rcu_read_unlock();
576 return ret;
577}
578
579/*
580 * Fill lttng_event array of all kernel events in the channel.
581 */
582static int list_lttng_kernel_events(char *channel_name,
b4e3ceb9
PP
583 struct ltt_kernel_session *kernel_session,
584 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
585{
586 int i = 0, ret;
587 unsigned int nb_event;
588 struct ltt_kernel_event *event;
589 struct ltt_kernel_channel *kchan;
b4e3ceb9
PP
590 size_t extended_len = 0;
591 void *extended_at;
2f77fc4b
DG
592
593 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
594 if (kchan == NULL) {
f73fabfd 595 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG
596 goto error;
597 }
598
599 nb_event = kchan->event_count;
600
601 DBG("Listing events for channel %s", kchan->channel->name);
602
603 if (nb_event == 0) {
b4e3ceb9 604 *total_size = 0;
834978fd 605 *events = NULL;
db906c12 606 goto end;
2f77fc4b
DG
607 }
608
b4e3ceb9
PP
609 /* Compute required extended infos size */
610 cds_list_for_each_entry(event, &kchan->events_list.head, list) {
795d57ce
PP
611 increment_extended_len(event->filter_expression, NULL,
612 &extended_len);
b4e3ceb9
PP
613 }
614
615 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
616 *events = zmalloc(*total_size);
2f77fc4b 617 if (*events == NULL) {
f73fabfd 618 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
619 goto error;
620 }
621
ab4aa612 622 extended_at = ((void *) *events) +
b4e3ceb9
PP
623 nb_event * sizeof(struct lttng_event);
624
2f77fc4b
DG
625 /* Kernel channels */
626 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
627 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
628 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
629 (*events)[i].enabled = event->enabled;
00f992f2
JG
630 (*events)[i].filter =
631 (unsigned char) !!event->filter_expression;
2f77fc4b
DG
632
633 switch (event->event->instrumentation) {
634 case LTTNG_KERNEL_TRACEPOINT:
635 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
636 break;
2f77fc4b 637 case LTTNG_KERNEL_KRETPROBE:
1896972b
DG
638 (*events)[i].type = LTTNG_EVENT_FUNCTION;
639 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
640 sizeof(struct lttng_kernel_kprobe));
641 break;
642 case LTTNG_KERNEL_KPROBE:
2f77fc4b
DG
643 (*events)[i].type = LTTNG_EVENT_PROBE;
644 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
645 sizeof(struct lttng_kernel_kprobe));
646 break;
647 case LTTNG_KERNEL_FUNCTION:
648 (*events)[i].type = LTTNG_EVENT_FUNCTION;
649 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
650 sizeof(struct lttng_kernel_function));
651 break;
652 case LTTNG_KERNEL_NOOP:
653 (*events)[i].type = LTTNG_EVENT_NOOP;
654 break;
655 case LTTNG_KERNEL_SYSCALL:
656 (*events)[i].type = LTTNG_EVENT_SYSCALL;
657 break;
658 case LTTNG_KERNEL_ALL:
659 assert(0);
660 break;
661 }
662 i++;
b4e3ceb9
PP
663
664 /* Append extended info */
795d57ce
PP
665 append_extended_info(event->filter_expression, NULL,
666 &extended_at);
2f77fc4b
DG
667 }
668
db906c12 669end:
2f77fc4b
DG
670 return nb_event;
671
672error:
f73fabfd
DG
673 /* Negate the error code to differentiate the size from an error */
674 return -ret;
2f77fc4b
DG
675}
676
677/*
678 * Add URI so the consumer output object. Set the correct path depending on the
679 * domain adding the default trace directory.
680 */
681static int add_uri_to_consumer(struct consumer_output *consumer,
56a37563
JG
682 struct lttng_uri *uri, enum lttng_domain_type domain,
683 const char *session_name)
2f77fc4b 684{
f73fabfd 685 int ret = LTTNG_OK;
2f77fc4b
DG
686 const char *default_trace_dir;
687
688 assert(uri);
689
690 if (consumer == NULL) {
691 DBG("No consumer detected. Don't add URI. Stopping.");
f73fabfd 692 ret = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
693 goto error;
694 }
695
696 switch (domain) {
697 case LTTNG_DOMAIN_KERNEL:
698 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
699 break;
700 case LTTNG_DOMAIN_UST:
701 default_trace_dir = DEFAULT_UST_TRACE_DIR;
702 break;
703 default:
704 /*
705 * This case is possible is we try to add the URI to the global tracing
706 * session consumer object which in this case there is no subdir.
707 */
708 default_trace_dir = "";
709 }
710
711 switch (uri->dtype) {
712 case LTTNG_DST_IPV4:
713 case LTTNG_DST_IPV6:
714 DBG2("Setting network URI to consumer");
715
df75acac
DG
716 if (consumer->type == CONSUMER_DST_NET) {
717 if ((uri->stype == LTTNG_STREAM_CONTROL &&
785d2d0d
DG
718 consumer->dst.net.control_isset) ||
719 (uri->stype == LTTNG_STREAM_DATA &&
720 consumer->dst.net.data_isset)) {
df75acac
DG
721 ret = LTTNG_ERR_URL_EXIST;
722 goto error;
723 }
724 } else {
725 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
785d2d0d
DG
726 }
727
df75acac
DG
728 consumer->type = CONSUMER_DST_NET;
729
2f77fc4b
DG
730 /* Set URI into consumer output object */
731 ret = consumer_set_network_uri(consumer, uri);
732 if (ret < 0) {
a74934ba 733 ret = -ret;
2f77fc4b
DG
734 goto error;
735 } else if (ret == 1) {
736 /*
737 * URI was the same in the consumer so we do not append the subdir
738 * again so to not duplicate output dir.
739 */
f86c9f4e 740 ret = LTTNG_OK;
2f77fc4b
DG
741 goto error;
742 }
743
744 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
745 ret = consumer_set_subdir(consumer, session_name);
746 if (ret < 0) {
f73fabfd 747 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
748 goto error;
749 }
750 }
751
752 if (uri->stype == LTTNG_STREAM_CONTROL) {
753 /* On a new subdir, reappend the default trace dir. */
c30ce0b3
CB
754 strncat(consumer->subdir, default_trace_dir,
755 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2f77fc4b
DG
756 DBG3("Append domain trace name to subdir %s", consumer->subdir);
757 }
758
759 break;
760 case LTTNG_DST_PATH:
761 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
762 memset(consumer->dst.trace_path, 0,
763 sizeof(consumer->dst.trace_path));
9ac05d92
MD
764 /* Explicit length checks for strcpy and strcat. */
765 if (strlen(uri->dst.path) + strlen(default_trace_dir)
766 >= sizeof(consumer->dst.trace_path)) {
767 ret = LTTNG_ERR_FATAL;
768 goto error;
769 }
770 strcpy(consumer->dst.trace_path, uri->dst.path);
2f77fc4b 771 /* Append default trace dir */
9ac05d92 772 strcat(consumer->dst.trace_path, default_trace_dir);
2f77fc4b
DG
773 /* Flag consumer as local. */
774 consumer->type = CONSUMER_DST_LOCAL;
775 break;
776 }
777
a74934ba
DG
778 ret = LTTNG_OK;
779
2f77fc4b
DG
780error:
781 return ret;
782}
783
784/*
785 * Init tracing by creating trace directory and sending fds kernel consumer.
786 */
787static int init_kernel_tracing(struct ltt_kernel_session *session)
788{
789 int ret = 0;
790 struct lttng_ht_iter iter;
791 struct consumer_socket *socket;
792
793 assert(session);
794
e7fe706f
DG
795 rcu_read_lock();
796
2f77fc4b
DG
797 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
798 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
799 socket, node.node) {
2f77fc4b 800 pthread_mutex_lock(socket->lock);
f50f23d9 801 ret = kernel_consumer_send_session(socket, session);
2f77fc4b
DG
802 pthread_mutex_unlock(socket->lock);
803 if (ret < 0) {
f73fabfd 804 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
805 goto error;
806 }
807 }
808 }
809
810error:
e7fe706f 811 rcu_read_unlock();
2f77fc4b
DG
812 return ret;
813}
814
815/*
816 * Create a socket to the relayd using the URI.
817 *
818 * On success, the relayd_sock pointer is set to the created socket.
819 * Else, it's stays untouched and a lttcomm error code is returned.
820 */
6151a90f 821static int create_connect_relayd(struct lttng_uri *uri,
b31610f2
JD
822 struct lttcomm_relayd_sock **relayd_sock,
823 struct consumer_output *consumer)
2f77fc4b
DG
824{
825 int ret;
6151a90f 826 struct lttcomm_relayd_sock *rsock;
2f77fc4b 827
6151a90f
JD
828 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
829 RELAYD_VERSION_COMM_MINOR);
830 if (!rsock) {
f73fabfd 831 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
832 goto error;
833 }
834
ffe60014
DG
835 /*
836 * Connect to relayd so we can proceed with a session creation. This call
837 * can possibly block for an arbitrary amount of time to set the health
838 * state to be in poll execution.
839 */
840 health_poll_entry();
6151a90f 841 ret = relayd_connect(rsock);
ffe60014 842 health_poll_exit();
2f77fc4b
DG
843 if (ret < 0) {
844 ERR("Unable to reach lttng-relayd");
f73fabfd 845 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG
846 goto free_sock;
847 }
848
849 /* Create socket for control stream. */
850 if (uri->stype == LTTNG_STREAM_CONTROL) {
851 DBG3("Creating relayd stream socket from URI");
852
853 /* Check relayd version */
6151a90f 854 ret = relayd_version_check(rsock);
2f77fc4b 855 if (ret < 0) {
f73fabfd 856 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
2f77fc4b
DG
857 goto close_sock;
858 }
b31610f2
JD
859 consumer->relay_major_version = rsock->major;
860 consumer->relay_minor_version = rsock->minor;
2f77fc4b
DG
861 } else if (uri->stype == LTTNG_STREAM_DATA) {
862 DBG3("Creating relayd data socket from URI");
863 } else {
864 /* Command is not valid */
865 ERR("Relayd invalid stream type: %d", uri->stype);
f73fabfd 866 ret = LTTNG_ERR_INVALID;
2f77fc4b
DG
867 goto close_sock;
868 }
869
6151a90f 870 *relayd_sock = rsock;
2f77fc4b 871
f73fabfd 872 return LTTNG_OK;
2f77fc4b
DG
873
874close_sock:
6151a90f
JD
875 /* The returned value is not useful since we are on an error path. */
876 (void) relayd_close(rsock);
2f77fc4b 877free_sock:
6151a90f 878 free(rsock);
2f77fc4b
DG
879error:
880 return ret;
881}
882
883/*
884 * Connect to the relayd using URI and send the socket to the right consumer.
885 */
56a37563
JG
886static int send_consumer_relayd_socket(enum lttng_domain_type domain,
887 unsigned int session_id, struct lttng_uri *relayd_uri,
888 struct consumer_output *consumer,
d3e2ba59
JD
889 struct consumer_socket *consumer_sock,
890 char *session_name, char *hostname, int session_live_timer)
2f77fc4b
DG
891{
892 int ret;
6151a90f 893 struct lttcomm_relayd_sock *rsock = NULL;
2f77fc4b 894
ffe60014 895 /* Connect to relayd and make version check if uri is the control. */
b31610f2 896 ret = create_connect_relayd(relayd_uri, &rsock, consumer);
ffe60014 897 if (ret != LTTNG_OK) {
6151a90f 898 goto error;
ffe60014 899 }
6151a90f 900 assert(rsock);
ffe60014 901
2f77fc4b 902 /* Set the network sequence index if not set. */
d88aee68
DG
903 if (consumer->net_seq_index == (uint64_t) -1ULL) {
904 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
905 /*
906 * Increment net_seq_idx because we are about to transfer the
907 * new relayd socket to the consumer.
d88aee68 908 * Assign unique key so the consumer can match streams.
2f77fc4b 909 */
d88aee68
DG
910 consumer->net_seq_index = ++relayd_net_seq_idx;
911 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
912 }
913
2f77fc4b 914 /* Send relayd socket to consumer. */
6151a90f 915 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
d3e2ba59
JD
916 relayd_uri->stype, session_id,
917 session_name, hostname, session_live_timer);
2f77fc4b 918 if (ret < 0) {
f73fabfd 919 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
920 goto close_sock;
921 }
922
c890b720
DG
923 /* Flag that the corresponding socket was sent. */
924 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
ffe60014 925 consumer_sock->control_sock_sent = 1;
c890b720 926 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
ffe60014 927 consumer_sock->data_sock_sent = 1;
c890b720
DG
928 }
929
f73fabfd 930 ret = LTTNG_OK;
2f77fc4b
DG
931
932 /*
933 * Close socket which was dup on the consumer side. The session daemon does
934 * NOT keep track of the relayd socket(s) once transfer to the consumer.
935 */
936
937close_sock:
6151a90f
JD
938 (void) relayd_close(rsock);
939 free(rsock);
2f77fc4b 940
6151a90f 941error:
ffe60014
DG
942 if (ret != LTTNG_OK) {
943 /*
d9078d0c
DG
944 * The consumer output for this session should not be used anymore
945 * since the relayd connection failed thus making any tracing or/and
946 * streaming not usable.
ffe60014 947 */
d9078d0c 948 consumer->enabled = 0;
ffe60014 949 }
2f77fc4b
DG
950 return ret;
951}
952
953/*
954 * Send both relayd sockets to a specific consumer and domain. This is a
955 * helper function to facilitate sending the information to the consumer for a
956 * session.
957 */
56a37563
JG
958static int send_consumer_relayd_sockets(enum lttng_domain_type domain,
959 unsigned int session_id, struct consumer_output *consumer,
960 struct consumer_socket *sock, char *session_name,
961 char *hostname, int session_live_timer)
2f77fc4b 962{
dda67f6c 963 int ret = LTTNG_OK;
2f77fc4b 964
2f77fc4b 965 assert(consumer);
6dc3064a 966 assert(sock);
2f77fc4b 967
2f77fc4b 968 /* Sending control relayd socket. */
ffe60014 969 if (!sock->control_sock_sent) {
6dc3064a 970 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD
971 &consumer->dst.net.control, consumer, sock,
972 session_name, hostname, session_live_timer);
c890b720
DG
973 if (ret != LTTNG_OK) {
974 goto error;
975 }
2f77fc4b
DG
976 }
977
978 /* Sending data relayd socket. */
ffe60014 979 if (!sock->data_sock_sent) {
6dc3064a 980 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD
981 &consumer->dst.net.data, consumer, sock,
982 session_name, hostname, session_live_timer);
c890b720
DG
983 if (ret != LTTNG_OK) {
984 goto error;
985 }
2f77fc4b
DG
986 }
987
2f77fc4b
DG
988error:
989 return ret;
990}
991
992/*
993 * Setup relayd connections for a tracing session. First creates the socket to
994 * the relayd and send them to the right domain consumer. Consumer type MUST be
995 * network.
996 */
ffe60014 997int cmd_setup_relayd(struct ltt_session *session)
2f77fc4b 998{
f73fabfd 999 int ret = LTTNG_OK;
2f77fc4b
DG
1000 struct ltt_ust_session *usess;
1001 struct ltt_kernel_session *ksess;
1002 struct consumer_socket *socket;
1003 struct lttng_ht_iter iter;
1004
1005 assert(session);
1006
1007 usess = session->ust_session;
1008 ksess = session->kernel_session;
1009
785d2d0d 1010 DBG("Setting relayd for session %s", session->name);
2f77fc4b 1011
e7fe706f
DG
1012 rcu_read_lock();
1013
2f77fc4b
DG
1014 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
1015 && usess->consumer->enabled) {
1016 /* For each consumer socket, send relayd sockets */
1017 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
1018 socket, node.node) {
2f77fc4b 1019 pthread_mutex_lock(socket->lock);
6dc3064a 1020 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
d3e2ba59
JD
1021 usess->consumer, socket,
1022 session->name, session->hostname,
1023 session->live_timer);
2f77fc4b 1024 pthread_mutex_unlock(socket->lock);
f73fabfd 1025 if (ret != LTTNG_OK) {
2f77fc4b
DG
1026 goto error;
1027 }
6dc3064a
DG
1028 /* Session is now ready for network streaming. */
1029 session->net_handle = 1;
2f77fc4b 1030 }
b31610f2
JD
1031 session->consumer->relay_major_version =
1032 usess->consumer->relay_major_version;
1033 session->consumer->relay_minor_version =
1034 usess->consumer->relay_minor_version;
2f77fc4b
DG
1035 }
1036
1037 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
1038 && ksess->consumer->enabled) {
1039 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
1040 socket, node.node) {
2f77fc4b 1041 pthread_mutex_lock(socket->lock);
6dc3064a 1042 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
d3e2ba59
JD
1043 ksess->consumer, socket,
1044 session->name, session->hostname,
1045 session->live_timer);
2f77fc4b 1046 pthread_mutex_unlock(socket->lock);
f73fabfd 1047 if (ret != LTTNG_OK) {
2f77fc4b
DG
1048 goto error;
1049 }
6dc3064a
DG
1050 /* Session is now ready for network streaming. */
1051 session->net_handle = 1;
2f77fc4b 1052 }
b31610f2
JD
1053 session->consumer->relay_major_version =
1054 ksess->consumer->relay_major_version;
1055 session->consumer->relay_minor_version =
1056 ksess->consumer->relay_minor_version;
2f77fc4b
DG
1057 }
1058
1059error:
e7fe706f 1060 rcu_read_unlock();
2f77fc4b
DG
1061 return ret;
1062}
1063
9b6c7ec5
DG
1064/*
1065 * Start a kernel session by opening all necessary streams.
1066 */
1067static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
1068{
1069 int ret;
1070 struct ltt_kernel_channel *kchan;
1071
1072 /* Open kernel metadata */
07b86b52 1073 if (ksess->metadata == NULL && ksess->output_traces) {
9b6c7ec5
DG
1074 ret = kernel_open_metadata(ksess);
1075 if (ret < 0) {
1076 ret = LTTNG_ERR_KERN_META_FAIL;
1077 goto error;
1078 }
1079 }
1080
1081 /* Open kernel metadata stream */
07b86b52 1082 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
9b6c7ec5
DG
1083 ret = kernel_open_metadata_stream(ksess);
1084 if (ret < 0) {
1085 ERR("Kernel create metadata stream failed");
1086 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1087 goto error;
1088 }
1089 }
1090
1091 /* For each channel */
1092 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
1093 if (kchan->stream_count == 0) {
1094 ret = kernel_open_channel_stream(kchan);
1095 if (ret < 0) {
1096 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1097 goto error;
1098 }
1099 /* Update the stream global counter */
1100 ksess->stream_count_global += ret;
1101 }
1102 }
1103
1104 /* Setup kernel consumer socket and send fds to it */
1105 ret = init_kernel_tracing(ksess);
e43c41c5 1106 if (ret != 0) {
9b6c7ec5
DG
1107 ret = LTTNG_ERR_KERN_START_FAIL;
1108 goto error;
1109 }
1110
1111 /* This start the kernel tracing */
1112 ret = kernel_start_session(ksess);
1113 if (ret < 0) {
1114 ret = LTTNG_ERR_KERN_START_FAIL;
1115 goto error;
1116 }
1117
1118 /* Quiescent wait after starting trace */
784303b0 1119 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5 1120
14fb1ebe 1121 ksess->active = 1;
9b6c7ec5
DG
1122
1123 ret = LTTNG_OK;
1124
1125error:
1126 return ret;
1127}
1128
2f77fc4b
DG
1129/*
1130 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1131 */
56a37563
JG
1132int cmd_disable_channel(struct ltt_session *session,
1133 enum lttng_domain_type domain, char *channel_name)
2f77fc4b
DG
1134{
1135 int ret;
1136 struct ltt_ust_session *usess;
1137
1138 usess = session->ust_session;
1139
2223c96f
DG
1140 rcu_read_lock();
1141
2f77fc4b
DG
1142 switch (domain) {
1143 case LTTNG_DOMAIN_KERNEL:
1144 {
1145 ret = channel_kernel_disable(session->kernel_session,
1146 channel_name);
f73fabfd 1147 if (ret != LTTNG_OK) {
2f77fc4b
DG
1148 goto error;
1149 }
1150
1151 kernel_wait_quiescent(kernel_tracer_fd);
1152 break;
1153 }
1154 case LTTNG_DOMAIN_UST:
1155 {
1156 struct ltt_ust_channel *uchan;
1157 struct lttng_ht *chan_ht;
1158
1159 chan_ht = usess->domain_global.channels;
1160
1161 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
1162 if (uchan == NULL) {
f73fabfd 1163 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
1164 goto error;
1165 }
1166
7972aab2 1167 ret = channel_ust_disable(usess, uchan);
f73fabfd 1168 if (ret != LTTNG_OK) {
2f77fc4b
DG
1169 goto error;
1170 }
1171 break;
1172 }
2f77fc4b 1173 default:
f73fabfd 1174 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1175 goto error;
1176 }
1177
f73fabfd 1178 ret = LTTNG_OK;
2f77fc4b
DG
1179
1180error:
2223c96f 1181 rcu_read_unlock();
2f77fc4b
DG
1182 return ret;
1183}
1184
ccf10263
MD
1185/*
1186 * Command LTTNG_TRACK_PID processed by the client thread.
a9ad0c8f
MD
1187 *
1188 * Called with session lock held.
ccf10263 1189 */
56a37563
JG
1190int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain,
1191 int pid)
ccf10263
MD
1192{
1193 int ret;
1194
1195 rcu_read_lock();
1196
1197 switch (domain) {
1198 case LTTNG_DOMAIN_KERNEL:
1199 {
1200 struct ltt_kernel_session *ksess;
1201
1202 ksess = session->kernel_session;
1203
1204 ret = kernel_track_pid(ksess, pid);
1205 if (ret != LTTNG_OK) {
1206 goto error;
1207 }
1208
1209 kernel_wait_quiescent(kernel_tracer_fd);
1210 break;
1211 }
ccf10263 1212 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
1213 {
1214 struct ltt_ust_session *usess;
1215
1216 usess = session->ust_session;
1217
1218 ret = trace_ust_track_pid(usess, pid);
1219 if (ret != LTTNG_OK) {
1220 goto error;
1221 }
1222 break;
1223 }
ccf10263
MD
1224 default:
1225 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1226 goto error;
1227 }
1228
1229 ret = LTTNG_OK;
1230
1231error:
1232 rcu_read_unlock();
1233 return ret;
1234}
1235
1236/*
1237 * Command LTTNG_UNTRACK_PID processed by the client thread.
a9ad0c8f
MD
1238 *
1239 * Called with session lock held.
ccf10263 1240 */
56a37563
JG
1241int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain,
1242 int pid)
ccf10263
MD
1243{
1244 int ret;
1245
1246 rcu_read_lock();
1247
1248 switch (domain) {
1249 case LTTNG_DOMAIN_KERNEL:
1250 {
1251 struct ltt_kernel_session *ksess;
1252
1253 ksess = session->kernel_session;
1254
1255 ret = kernel_untrack_pid(ksess, pid);
1256 if (ret != LTTNG_OK) {
1257 goto error;
1258 }
1259
1260 kernel_wait_quiescent(kernel_tracer_fd);
1261 break;
1262 }
ccf10263 1263 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
1264 {
1265 struct ltt_ust_session *usess;
1266
1267 usess = session->ust_session;
1268
1269 ret = trace_ust_untrack_pid(usess, pid);
1270 if (ret != LTTNG_OK) {
1271 goto error;
1272 }
1273 break;
1274 }
ccf10263
MD
1275 default:
1276 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1277 goto error;
1278 }
1279
1280 ret = LTTNG_OK;
1281
1282error:
1283 rcu_read_unlock();
1284 return ret;
1285}
1286
2f77fc4b
DG
1287/*
1288 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1289 *
1290 * The wpipe arguments is used as a notifier for the kernel thread.
1291 */
1292int cmd_enable_channel(struct ltt_session *session,
7972aab2 1293 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
2f77fc4b
DG
1294{
1295 int ret;
1296 struct ltt_ust_session *usess = session->ust_session;
1297 struct lttng_ht *chan_ht;
1f345e94 1298 size_t len;
2f77fc4b
DG
1299
1300 assert(session);
1301 assert(attr);
7972aab2 1302 assert(domain);
2f77fc4b 1303
f5436bfc 1304 len = lttng_strnlen(attr->name, sizeof(attr->name));
1f345e94
PP
1305
1306 /* Validate channel name */
1307 if (attr->name[0] == '.' ||
1308 memchr(attr->name, '/', len) != NULL) {
1309 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1310 goto end;
1311 }
1312
2f77fc4b
DG
1313 DBG("Enabling channel %s for session %s", attr->name, session->name);
1314
03b4fdcf
DG
1315 rcu_read_lock();
1316
ecc48a90
JD
1317 /*
1318 * Don't try to enable a channel if the session has been started at
1319 * some point in time before. The tracer does not allow it.
1320 */
8382cf6f 1321 if (session->has_been_started) {
ecc48a90
JD
1322 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1323 goto error;
1324 }
1325
1326 /*
1327 * If the session is a live session, remove the switch timer, the
1328 * live timer does the same thing but sends also synchronisation
1329 * beacons for inactive streams.
1330 */
1331 if (session->live_timer > 0) {
1332 attr->attr.live_timer_interval = session->live_timer;
1333 attr->attr.switch_timer_interval = 0;
1334 }
1335
7972aab2 1336 switch (domain->type) {
2f77fc4b
DG
1337 case LTTNG_DOMAIN_KERNEL:
1338 {
1339 struct ltt_kernel_channel *kchan;
1340
2f77fc4b
DG
1341 kchan = trace_kernel_get_channel_by_name(attr->name,
1342 session->kernel_session);
1343 if (kchan == NULL) {
1344 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
85076754
MD
1345 if (attr->name[0] != '\0') {
1346 session->kernel_session->has_non_default_channel = 1;
1347 }
2f77fc4b
DG
1348 } else {
1349 ret = channel_kernel_enable(session->kernel_session, kchan);
1350 }
1351
f73fabfd 1352 if (ret != LTTNG_OK) {
2f77fc4b
DG
1353 goto error;
1354 }
1355
784303b0 1356 kernel_wait_quiescent(kernel_tracer_fd);
2f77fc4b
DG
1357 break;
1358 }
1359 case LTTNG_DOMAIN_UST:
9232818f
JG
1360 case LTTNG_DOMAIN_JUL:
1361 case LTTNG_DOMAIN_LOG4J:
1362 case LTTNG_DOMAIN_PYTHON:
2f77fc4b
DG
1363 {
1364 struct ltt_ust_channel *uchan;
1365
9232818f
JG
1366 /*
1367 * FIXME
1368 *
1369 * Current agent implementation limitations force us to allow
1370 * only one channel at once in "agent" subdomains. Each
1371 * subdomain has a default channel name which must be strictly
1372 * adhered to.
1373 */
1374 if (domain->type == LTTNG_DOMAIN_JUL) {
1375 if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME,
1376 LTTNG_SYMBOL_NAME_LEN)) {
1377 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1378 goto error;
1379 }
1380 } else if (domain->type == LTTNG_DOMAIN_LOG4J) {
1381 if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME,
1382 LTTNG_SYMBOL_NAME_LEN)) {
1383 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1384 goto error;
1385 }
1386 } else if (domain->type == LTTNG_DOMAIN_PYTHON) {
1387 if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME,
1388 LTTNG_SYMBOL_NAME_LEN)) {
1389 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1390 goto error;
1391 }
1392 }
1393
2f77fc4b
DG
1394 chan_ht = usess->domain_global.channels;
1395
1396 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1397 if (uchan == NULL) {
7972aab2 1398 ret = channel_ust_create(usess, attr, domain->buf_type);
85076754
MD
1399 if (attr->name[0] != '\0') {
1400 usess->has_non_default_channel = 1;
1401 }
2f77fc4b 1402 } else {
7972aab2 1403 ret = channel_ust_enable(usess, uchan);
2f77fc4b
DG
1404 }
1405 break;
1406 }
2f77fc4b 1407 default:
f73fabfd 1408 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1409 goto error;
1410 }
1411
1412error:
2223c96f 1413 rcu_read_unlock();
1f345e94 1414end:
2f77fc4b
DG
1415 return ret;
1416}
1417
2f77fc4b
DG
1418/*
1419 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1420 */
56a37563
JG
1421int cmd_disable_event(struct ltt_session *session,
1422 enum lttng_domain_type domain, char *channel_name,
6e911cad 1423 struct lttng_event *event)
2f77fc4b
DG
1424{
1425 int ret;
6e911cad
MD
1426 char *event_name;
1427
18a720cd
MD
1428 DBG("Disable event command for event \'%s\'", event->name);
1429
6e911cad 1430 event_name = event->name;
7076b56e
JG
1431 if (validate_event_name(event_name)) {
1432 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1433 goto error;
1434 }
6e911cad 1435
9b7431cf
JG
1436 /* Error out on unhandled search criteria */
1437 if (event->loglevel_type || event->loglevel != -1 || event->enabled
6e911cad 1438 || event->pid || event->filter || event->exclusion) {
7076b56e
JG
1439 ret = LTTNG_ERR_UNK;
1440 goto error;
6e911cad 1441 }
2f77fc4b 1442
2223c96f
DG
1443 rcu_read_lock();
1444
2f77fc4b
DG
1445 switch (domain) {
1446 case LTTNG_DOMAIN_KERNEL:
1447 {
1448 struct ltt_kernel_channel *kchan;
1449 struct ltt_kernel_session *ksess;
1450
1451 ksess = session->kernel_session;
1452
85076754
MD
1453 /*
1454 * If a non-default channel has been created in the
1455 * session, explicitely require that -c chan_name needs
1456 * to be provided.
1457 */
1458 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1459 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1460 goto error_unlock;
85076754
MD
1461 }
1462
2f77fc4b
DG
1463 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1464 if (kchan == NULL) {
f73fabfd 1465 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
7076b56e 1466 goto error_unlock;
2f77fc4b
DG
1467 }
1468
6e911cad
MD
1469 switch (event->type) {
1470 case LTTNG_EVENT_ALL:
9550ee81 1471 case LTTNG_EVENT_TRACEPOINT:
d0ae4ea8 1472 case LTTNG_EVENT_SYSCALL:
9550ee81
JR
1473 case LTTNG_EVENT_PROBE:
1474 case LTTNG_EVENT_FUNCTION:
1475 case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */
1476 if (event_name[0] == '\0') {
1477 ret = event_kernel_disable_event(kchan,
1478 NULL, event->type);
29c62722 1479 } else {
d0ae4ea8 1480 ret = event_kernel_disable_event(kchan,
9550ee81 1481 event_name, event->type);
29c62722 1482 }
6e911cad 1483 if (ret != LTTNG_OK) {
7076b56e 1484 goto error_unlock;
6e911cad
MD
1485 }
1486 break;
6e911cad
MD
1487 default:
1488 ret = LTTNG_ERR_UNK;
7076b56e 1489 goto error_unlock;
2f77fc4b
DG
1490 }
1491
1492 kernel_wait_quiescent(kernel_tracer_fd);
1493 break;
1494 }
1495 case LTTNG_DOMAIN_UST:
1496 {
1497 struct ltt_ust_channel *uchan;
1498 struct ltt_ust_session *usess;
1499
1500 usess = session->ust_session;
1501
7076b56e
JG
1502 if (validate_ust_event_name(event_name)) {
1503 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1504 goto error_unlock;
1505 }
1506
85076754
MD
1507 /*
1508 * If a non-default channel has been created in the
9550ee81 1509 * session, explicitly require that -c chan_name needs
85076754
MD
1510 * to be provided.
1511 */
1512 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1513 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1514 goto error_unlock;
85076754
MD
1515 }
1516
2f77fc4b
DG
1517 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1518 channel_name);
1519 if (uchan == NULL) {
f73fabfd 1520 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
7076b56e 1521 goto error_unlock;
2f77fc4b
DG
1522 }
1523
6e911cad
MD
1524 switch (event->type) {
1525 case LTTNG_EVENT_ALL:
b3639870
JR
1526 /*
1527 * An empty event name means that everything
1528 * should be disabled.
1529 */
1530 if (event->name[0] == '\0') {
1531 ret = event_ust_disable_all_tracepoints(usess, uchan);
77d536b2
JR
1532 } else {
1533 ret = event_ust_disable_tracepoint(usess, uchan,
1534 event_name);
1535 }
6e911cad 1536 if (ret != LTTNG_OK) {
7076b56e 1537 goto error_unlock;
6e911cad
MD
1538 }
1539 break;
1540 default:
1541 ret = LTTNG_ERR_UNK;
7076b56e 1542 goto error_unlock;
2f77fc4b
DG
1543 }
1544
1545 DBG3("Disable UST event %s in channel %s completed", event_name,
1546 channel_name);
1547 break;
1548 }
5cdb6027 1549 case LTTNG_DOMAIN_LOG4J:
f20baf8e 1550 case LTTNG_DOMAIN_JUL:
0e115563 1551 case LTTNG_DOMAIN_PYTHON:
f20baf8e 1552 {
fefd409b 1553 struct agent *agt;
f20baf8e
DG
1554 struct ltt_ust_session *usess = session->ust_session;
1555
1556 assert(usess);
1557
6e911cad
MD
1558 switch (event->type) {
1559 case LTTNG_EVENT_ALL:
1560 break;
1561 default:
1562 ret = LTTNG_ERR_UNK;
7076b56e 1563 goto error_unlock;
6e911cad
MD
1564 }
1565
5cdb6027 1566 agt = trace_ust_find_agent(usess, domain);
fefd409b
DG
1567 if (!agt) {
1568 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
7076b56e 1569 goto error_unlock;
fefd409b 1570 }
b3639870
JR
1571 /*
1572 * An empty event name means that everything
1573 * should be disabled.
1574 */
1575 if (event->name[0] == '\0') {
18a720cd
MD
1576 ret = event_agent_disable_all(usess, agt);
1577 } else {
1578 ret = event_agent_disable(usess, agt, event_name);
1579 }
f20baf8e 1580 if (ret != LTTNG_OK) {
7076b56e 1581 goto error_unlock;
f20baf8e
DG
1582 }
1583
1584 break;
1585 }
2f77fc4b 1586 default:
f73fabfd 1587 ret = LTTNG_ERR_UND;
7076b56e 1588 goto error_unlock;
2f77fc4b
DG
1589 }
1590
f73fabfd 1591 ret = LTTNG_OK;
2f77fc4b 1592
7076b56e 1593error_unlock:
2223c96f 1594 rcu_read_unlock();
7076b56e 1595error:
2f77fc4b
DG
1596 return ret;
1597}
1598
2f77fc4b
DG
1599/*
1600 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1601 */
56a37563 1602int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain,
601d5acf 1603 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
2f77fc4b 1604{
d5979e4a 1605 int ret, chan_kern_created = 0, chan_ust_created = 0;
bdf64013
JG
1606 char *app_ctx_provider_name = NULL, *app_ctx_name = NULL;
1607
1608 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
1609 app_ctx_provider_name = ctx->u.app_ctx.provider_name;
1610 app_ctx_name = ctx->u.app_ctx.ctx_name;
1611 }
2f77fc4b
DG
1612
1613 switch (domain) {
1614 case LTTNG_DOMAIN_KERNEL:
979e618e
DG
1615 assert(session->kernel_session);
1616
1617 if (session->kernel_session->channel_count == 0) {
1618 /* Create default channel */
1619 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1620 if (ret != LTTNG_OK) {
1621 goto error;
1622 }
d5979e4a 1623 chan_kern_created = 1;
979e618e 1624 }
2f77fc4b 1625 /* Add kernel context to kernel tracer */
601d5acf 1626 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
f73fabfd 1627 if (ret != LTTNG_OK) {
2f77fc4b
DG
1628 goto error;
1629 }
1630 break;
bdf64013
JG
1631 case LTTNG_DOMAIN_JUL:
1632 case LTTNG_DOMAIN_LOG4J:
1633 {
1634 /*
1635 * Validate channel name.
1636 * If no channel name is given and the domain is JUL or LOG4J,
1637 * set it to the appropriate domain-specific channel name. If
1638 * a name is provided but does not match the expexted channel
1639 * name, return an error.
1640 */
1641 if (domain == LTTNG_DOMAIN_JUL && *channel_name &&
1642 strcmp(channel_name,
1643 DEFAULT_JUL_CHANNEL_NAME)) {
1644 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1645 goto error;
1646 } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name &&
1647 strcmp(channel_name,
1648 DEFAULT_LOG4J_CHANNEL_NAME)) {
1649 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1650 goto error;
1651 }
a93b3916 1652 /* break is _not_ missing here. */
bdf64013 1653 }
2f77fc4b
DG
1654 case LTTNG_DOMAIN_UST:
1655 {
1656 struct ltt_ust_session *usess = session->ust_session;
85076754
MD
1657 unsigned int chan_count;
1658
2f77fc4b
DG
1659 assert(usess);
1660
85076754 1661 chan_count = lttng_ht_get_count(usess->domain_global.channels);
979e618e
DG
1662 if (chan_count == 0) {
1663 struct lttng_channel *attr;
1664 /* Create default channel */
0a9c6494 1665 attr = channel_new_default_attr(domain, usess->buffer_type);
979e618e
DG
1666 if (attr == NULL) {
1667 ret = LTTNG_ERR_FATAL;
1668 goto error;
1669 }
1670
7972aab2 1671 ret = channel_ust_create(usess, attr, usess->buffer_type);
979e618e
DG
1672 if (ret != LTTNG_OK) {
1673 free(attr);
1674 goto error;
1675 }
1676 free(attr);
d5979e4a 1677 chan_ust_created = 1;
979e618e
DG
1678 }
1679
601d5acf 1680 ret = context_ust_add(usess, domain, ctx, channel_name);
bdf64013
JG
1681 free(app_ctx_provider_name);
1682 free(app_ctx_name);
1683 app_ctx_name = NULL;
1684 app_ctx_provider_name = NULL;
f73fabfd 1685 if (ret != LTTNG_OK) {
2f77fc4b
DG
1686 goto error;
1687 }
1688 break;
1689 }
2f77fc4b 1690 default:
f73fabfd 1691 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1692 goto error;
1693 }
1694
bdf64013
JG
1695 ret = LTTNG_OK;
1696 goto end;
2f77fc4b
DG
1697
1698error:
d5979e4a
DG
1699 if (chan_kern_created) {
1700 struct ltt_kernel_channel *kchan =
1701 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1702 session->kernel_session);
1703 /* Created previously, this should NOT fail. */
1704 assert(kchan);
1705 kernel_destroy_channel(kchan);
1706 }
1707
1708 if (chan_ust_created) {
1709 struct ltt_ust_channel *uchan =
1710 trace_ust_find_channel_by_name(
1711 session->ust_session->domain_global.channels,
1712 DEFAULT_CHANNEL_NAME);
1713 /* Created previously, this should NOT fail. */
1714 assert(uchan);
1715 /* Remove from the channel list of the session. */
1716 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1717 uchan);
1718 trace_ust_destroy_channel(uchan);
1719 }
bdf64013
JG
1720end:
1721 free(app_ctx_provider_name);
1722 free(app_ctx_name);
2f77fc4b
DG
1723 return ret;
1724}
1725
930a2e99
JG
1726static int validate_event_name(const char *name)
1727{
1728 int ret = 0;
1729 const char *c = name;
1730 const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN;
bf9807db 1731 bool null_terminated = false;
930a2e99
JG
1732
1733 /*
1734 * Make sure that unescaped wildcards are only used as the last
1735 * character of the event name.
1736 */
1737 while (c < event_name_end) {
1738 switch (*c) {
1739 case '\0':
bf9807db 1740 null_terminated = true;
930a2e99
JG
1741 goto end;
1742 case '\\':
1743 c++;
1744 break;
1745 case '*':
1746 if ((c + 1) < event_name_end && *(c + 1)) {
1747 /* Wildcard is not the last character */
1748 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1749 goto end;
1750 }
1751 default:
1752 break;
1753 }
1754 c++;
1755 }
1756end:
bf9807db
JG
1757 if (!ret && !null_terminated) {
1758 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1759 }
930a2e99
JG
1760 return ret;
1761}
1762
dac8e046
JG
1763static inline bool name_starts_with(const char *name, const char *prefix)
1764{
1765 const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
1766
1767 return !strncmp(name, prefix, max_cmp_len);
1768}
1769
1770/* Perform userspace-specific event name validation */
1771static int validate_ust_event_name(const char *name)
1772{
1773 int ret = 0;
1774
1775 if (!name) {
1776 ret = -1;
1777 goto end;
1778 }
1779
1780 /*
1781 * Check name against all internal UST event component namespaces used
1782 * by the agents.
1783 */
1784 if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) ||
1785 name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) ||
1786 name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) {
1787 ret = -1;
1788 }
1789
1790end:
1791 return ret;
1792}
88f06f15 1793
2f77fc4b 1794/*
88f06f15
JG
1795 * Internal version of cmd_enable_event() with a supplemental
1796 * "internal_event" flag which is used to enable internal events which should
1797 * be hidden from clients. Such events are used in the agent implementation to
1798 * enable the events through which all "agent" events are funeled.
2f77fc4b 1799 */
88f06f15
JG
1800static int _cmd_enable_event(struct ltt_session *session,
1801 struct lttng_domain *domain,
025faf73 1802 char *channel_name, struct lttng_event *event,
6b453b5e 1803 char *filter_expression,
db8f1377
JI
1804 struct lttng_filter_bytecode *filter,
1805 struct lttng_event_exclusion *exclusion,
88f06f15 1806 int wpipe, bool internal_event)
2f77fc4b 1807{
e5f5db7f 1808 int ret, channel_created = 0;
cfedea03 1809 struct lttng_channel *attr = NULL;
2f77fc4b
DG
1810
1811 assert(session);
1812 assert(event);
1813 assert(channel_name);
1814
2a385866
JG
1815 /* If we have a filter, we must have its filter expression */
1816 assert(!(!!filter_expression ^ !!filter));
1817
18a720cd
MD
1818 DBG("Enable event command for event \'%s\'", event->name);
1819
f5ac4bd7
MD
1820 rcu_read_lock();
1821
930a2e99
JG
1822 ret = validate_event_name(event->name);
1823 if (ret) {
1824 goto error;
1825 }
1826
7972aab2 1827 switch (domain->type) {
2f77fc4b
DG
1828 case LTTNG_DOMAIN_KERNEL:
1829 {
1830 struct ltt_kernel_channel *kchan;
1831
85076754
MD
1832 /*
1833 * If a non-default channel has been created in the
1834 * session, explicitely require that -c chan_name needs
1835 * to be provided.
1836 */
1837 if (session->kernel_session->has_non_default_channel
1838 && channel_name[0] == '\0') {
1839 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1840 goto error;
1841 }
1842
2f77fc4b
DG
1843 kchan = trace_kernel_get_channel_by_name(channel_name,
1844 session->kernel_session);
1845 if (kchan == NULL) {
0a9c6494
DG
1846 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1847 LTTNG_BUFFER_GLOBAL);
2f77fc4b 1848 if (attr == NULL) {
f73fabfd 1849 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1850 goto error;
1851 }
04c17253
MD
1852 if (lttng_strncpy(attr->name, channel_name,
1853 sizeof(attr->name))) {
1854 ret = LTTNG_ERR_INVALID;
04c17253
MD
1855 goto error;
1856 }
2f77fc4b
DG
1857
1858 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1859 if (ret != LTTNG_OK) {
2f77fc4b
DG
1860 goto error;
1861 }
e5f5db7f 1862 channel_created = 1;
2f77fc4b
DG
1863 }
1864
1865 /* Get the newly created kernel channel pointer */
1866 kchan = trace_kernel_get_channel_by_name(channel_name,
1867 session->kernel_session);
1868 if (kchan == NULL) {
1869 /* This sould not happen... */
f73fabfd 1870 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1871 goto error;
1872 }
1873
6e911cad
MD
1874 switch (event->type) {
1875 case LTTNG_EVENT_ALL:
29c62722 1876 {
00a62084
MD
1877 char *filter_expression_a = NULL;
1878 struct lttng_filter_bytecode *filter_a = NULL;
1879
1880 /*
1881 * We need to duplicate filter_expression and filter,
1882 * because ownership is passed to first enable
1883 * event.
1884 */
1885 if (filter_expression) {
1886 filter_expression_a = strdup(filter_expression);
1887 if (!filter_expression_a) {
1888 ret = LTTNG_ERR_FATAL;
1889 goto error;
1890 }
1891 }
1892 if (filter) {
1893 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
1894 if (!filter_a) {
1895 free(filter_expression_a);
1896 ret = LTTNG_ERR_FATAL;
1897 goto error;
1898 }
1899 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
1900 }
29c62722 1901 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
00a62084
MD
1902 ret = event_kernel_enable_event(kchan, event,
1903 filter_expression, filter);
a969e101
MD
1904 /* We have passed ownership */
1905 filter_expression = NULL;
1906 filter = NULL;
29c62722
MD
1907 if (ret != LTTNG_OK) {
1908 if (channel_created) {
1909 /* Let's not leak a useless channel. */
1910 kernel_destroy_channel(kchan);
1911 }
00a62084
MD
1912 free(filter_expression_a);
1913 free(filter_a);
29c62722
MD
1914 goto error;
1915 }
1916 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
00a62084
MD
1917 ret = event_kernel_enable_event(kchan, event,
1918 filter_expression_a, filter_a);
60d21fa2
AB
1919 /* We have passed ownership */
1920 filter_expression_a = NULL;
1921 filter_a = NULL;
29c62722
MD
1922 if (ret != LTTNG_OK) {
1923 goto error;
1924 }
1925 break;
1926 }
6e6ef3d7
DG
1927 case LTTNG_EVENT_PROBE:
1928 case LTTNG_EVENT_FUNCTION:
1929 case LTTNG_EVENT_FUNCTION_ENTRY:
6e911cad 1930 case LTTNG_EVENT_TRACEPOINT:
00a62084
MD
1931 ret = event_kernel_enable_event(kchan, event,
1932 filter_expression, filter);
a969e101
MD
1933 /* We have passed ownership */
1934 filter_expression = NULL;
1935 filter = NULL;
6e911cad
MD
1936 if (ret != LTTNG_OK) {
1937 if (channel_created) {
1938 /* Let's not leak a useless channel. */
1939 kernel_destroy_channel(kchan);
1940 }
1941 goto error;
e5f5db7f 1942 }
6e911cad
MD
1943 break;
1944 case LTTNG_EVENT_SYSCALL:
00a62084
MD
1945 ret = event_kernel_enable_event(kchan, event,
1946 filter_expression, filter);
a969e101
MD
1947 /* We have passed ownership */
1948 filter_expression = NULL;
1949 filter = NULL;
e2b957af
MD
1950 if (ret != LTTNG_OK) {
1951 goto error;
1952 }
6e911cad
MD
1953 break;
1954 default:
1955 ret = LTTNG_ERR_UNK;
2f77fc4b
DG
1956 goto error;
1957 }
1958
1959 kernel_wait_quiescent(kernel_tracer_fd);
1960 break;
1961 }
1962 case LTTNG_DOMAIN_UST:
1963 {
1964 struct ltt_ust_channel *uchan;
1965 struct ltt_ust_session *usess = session->ust_session;
1966
1967 assert(usess);
1968
85076754
MD
1969 /*
1970 * If a non-default channel has been created in the
1971 * session, explicitely require that -c chan_name needs
1972 * to be provided.
1973 */
1974 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1975 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1976 goto error;
1977 }
1978
2f77fc4b
DG
1979 /* Get channel from global UST domain */
1980 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1981 channel_name);
1982 if (uchan == NULL) {
1983 /* Create default channel */
0a9c6494
DG
1984 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1985 usess->buffer_type);
2f77fc4b 1986 if (attr == NULL) {
f73fabfd 1987 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1988 goto error;
1989 }
04c17253
MD
1990 if (lttng_strncpy(attr->name, channel_name,
1991 sizeof(attr->name))) {
1992 ret = LTTNG_ERR_INVALID;
04c17253
MD
1993 goto error;
1994 }
2f77fc4b
DG
1995
1996 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1997 if (ret != LTTNG_OK) {
2f77fc4b
DG
1998 goto error;
1999 }
2f77fc4b
DG
2000
2001 /* Get the newly created channel reference back */
2002 uchan = trace_ust_find_channel_by_name(
2003 usess->domain_global.channels, channel_name);
2004 assert(uchan);
2005 }
2006
141feb8c
JG
2007 if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) {
2008 /*
2009 * Don't allow users to add UST events to channels which
2010 * are assigned to a userspace subdomain (JUL, Log4J,
2011 * Python, etc.).
2012 */
2013 ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN;
2014 goto error;
2015 }
2016
dac8e046
JG
2017 if (!internal_event) {
2018 /*
2019 * Ensure the event name is not reserved for internal
2020 * use.
2021 */
2022 ret = validate_ust_event_name(event->name);
2023 if (ret) {
2024 WARN("Userspace event name %s failed validation.",
2025 event->name ?
2026 event->name : "NULL");
2027 ret = LTTNG_ERR_INVALID_EVENT_NAME;
2028 goto error;
2029 }
2030 }
2031
2f77fc4b 2032 /* At this point, the session and channel exist on the tracer */
6b453b5e 2033 ret = event_ust_enable_tracepoint(usess, uchan, event,
88f06f15
JG
2034 filter_expression, filter, exclusion,
2035 internal_event);
49d21f93
MD
2036 /* We have passed ownership */
2037 filter_expression = NULL;
2038 filter = NULL;
2039 exclusion = NULL;
94382e15
JG
2040 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2041 goto already_enabled;
2042 } else if (ret != LTTNG_OK) {
2f77fc4b
DG
2043 goto error;
2044 }
2045 break;
2046 }
5cdb6027 2047 case LTTNG_DOMAIN_LOG4J:
f20baf8e 2048 case LTTNG_DOMAIN_JUL:
0e115563 2049 case LTTNG_DOMAIN_PYTHON:
f20baf8e 2050 {
da6c3a50 2051 const char *default_event_name, *default_chan_name;
fefd409b 2052 struct agent *agt;
f20baf8e
DG
2053 struct lttng_event uevent;
2054 struct lttng_domain tmp_dom;
2055 struct ltt_ust_session *usess = session->ust_session;
2056
2057 assert(usess);
2058
5cdb6027 2059 agt = trace_ust_find_agent(usess, domain->type);
fefd409b 2060 if (!agt) {
5cdb6027 2061 agt = agent_create(domain->type);
fefd409b 2062 if (!agt) {
e5b3c48c 2063 ret = LTTNG_ERR_NOMEM;
fefd409b
DG
2064 goto error;
2065 }
2066 agent_add(agt, usess->agents);
2067 }
2068
022d91ba 2069 /* Create the default tracepoint. */
996de3c7 2070 memset(&uevent, 0, sizeof(uevent));
f20baf8e
DG
2071 uevent.type = LTTNG_EVENT_TRACEPOINT;
2072 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
51755dc8
JG
2073 default_event_name = event_get_default_agent_ust_name(
2074 domain->type);
da6c3a50 2075 if (!default_event_name) {
e5b3c48c 2076 ret = LTTNG_ERR_FATAL;
da6c3a50 2077 goto error;
f43f95a9 2078 }
da6c3a50 2079 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
f20baf8e
DG
2080 uevent.name[sizeof(uevent.name) - 1] = '\0';
2081
2082 /*
2083 * The domain type is changed because we are about to enable the
2084 * default channel and event for the JUL domain that are hardcoded.
2085 * This happens in the UST domain.
2086 */
2087 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
2088 tmp_dom.type = LTTNG_DOMAIN_UST;
2089
0e115563
DG
2090 switch (domain->type) {
2091 case LTTNG_DOMAIN_LOG4J:
da6c3a50 2092 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
0e115563
DG
2093 break;
2094 case LTTNG_DOMAIN_JUL:
da6c3a50 2095 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
0e115563
DG
2096 break;
2097 case LTTNG_DOMAIN_PYTHON:
2098 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
2099 break;
2100 default:
e98a44b0 2101 /* The switch/case we are in makes this impossible */
0e115563 2102 assert(0);
da6c3a50
DG
2103 }
2104
971da06a 2105 {
8404118c 2106 char *filter_expression_copy = NULL;
51755dc8 2107 struct lttng_filter_bytecode *filter_copy = NULL;
971da06a
JG
2108
2109 if (filter) {
51755dc8
JG
2110 const size_t filter_size = sizeof(
2111 struct lttng_filter_bytecode)
2112 + filter->len;
2113
2114 filter_copy = zmalloc(filter_size);
971da06a 2115 if (!filter_copy) {
018096a4 2116 ret = LTTNG_ERR_NOMEM;
b742e3e2 2117 goto error;
971da06a 2118 }
51755dc8 2119 memcpy(filter_copy, filter, filter_size);
971da06a 2120
8404118c
JG
2121 filter_expression_copy =
2122 strdup(filter_expression);
2123 if (!filter_expression) {
2124 ret = LTTNG_ERR_NOMEM;
51755dc8
JG
2125 }
2126
2127 if (!filter_expression_copy || !filter_copy) {
2128 free(filter_expression_copy);
2129 free(filter_copy);
2130 goto error;
8404118c 2131 }
971da06a
JG
2132 }
2133
88f06f15 2134 ret = cmd_enable_event_internal(session, &tmp_dom,
971da06a 2135 (char *) default_chan_name,
8404118c
JG
2136 &uevent, filter_expression_copy,
2137 filter_copy, NULL, wpipe);
971da06a
JG
2138 }
2139
94382e15
JG
2140 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2141 goto already_enabled;
2142 } else if (ret != LTTNG_OK) {
f20baf8e
DG
2143 goto error;
2144 }
2145
2146 /* The wild card * means that everything should be enabled. */
2147 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
8404118c
JG
2148 ret = event_agent_enable_all(usess, agt, event, filter,
2149 filter_expression);
f20baf8e 2150 } else {
8404118c
JG
2151 ret = event_agent_enable(usess, agt, event, filter,
2152 filter_expression);
f20baf8e 2153 }
51755dc8
JG
2154 filter = NULL;
2155 filter_expression = NULL;
f20baf8e
DG
2156 if (ret != LTTNG_OK) {
2157 goto error;
2158 }
2159
2160 break;
2161 }
2f77fc4b 2162 default:
f73fabfd 2163 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2164 goto error;
2165 }
2166
f73fabfd 2167 ret = LTTNG_OK;
2f77fc4b 2168
94382e15 2169already_enabled:
2f77fc4b 2170error:
49d21f93
MD
2171 free(filter_expression);
2172 free(filter);
2173 free(exclusion);
cfedea03 2174 free(attr);
2223c96f 2175 rcu_read_unlock();
2f77fc4b
DG
2176 return ret;
2177}
2178
88f06f15
JG
2179/*
2180 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2181 * We own filter, exclusion, and filter_expression.
2182 */
2183int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
2184 char *channel_name, struct lttng_event *event,
2185 char *filter_expression,
2186 struct lttng_filter_bytecode *filter,
2187 struct lttng_event_exclusion *exclusion,
2188 int wpipe)
2189{
2190 return _cmd_enable_event(session, domain, channel_name, event,
2191 filter_expression, filter, exclusion, wpipe, false);
2192}
2193
2194/*
2195 * Enable an event which is internal to LTTng. An internal should
2196 * never be made visible to clients and are immune to checks such as
2197 * reserved names.
2198 */
2199static int cmd_enable_event_internal(struct ltt_session *session,
2200 struct lttng_domain *domain,
2201 char *channel_name, struct lttng_event *event,
2202 char *filter_expression,
2203 struct lttng_filter_bytecode *filter,
2204 struct lttng_event_exclusion *exclusion,
2205 int wpipe)
2206{
2207 return _cmd_enable_event(session, domain, channel_name, event,
2208 filter_expression, filter, exclusion, wpipe, true);
2209}
2210
2f77fc4b
DG
2211/*
2212 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2213 */
56a37563
JG
2214ssize_t cmd_list_tracepoints(enum lttng_domain_type domain,
2215 struct lttng_event **events)
2f77fc4b
DG
2216{
2217 int ret;
2218 ssize_t nb_events = 0;
2219
2220 switch (domain) {
2221 case LTTNG_DOMAIN_KERNEL:
2222 nb_events = kernel_list_events(kernel_tracer_fd, events);
2223 if (nb_events < 0) {
f73fabfd 2224 ret = LTTNG_ERR_KERN_LIST_FAIL;
2f77fc4b
DG
2225 goto error;
2226 }
2227 break;
2228 case LTTNG_DOMAIN_UST:
2229 nb_events = ust_app_list_events(events);
2230 if (nb_events < 0) {
f73fabfd 2231 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
2232 goto error;
2233 }
2234 break;
5cdb6027 2235 case LTTNG_DOMAIN_LOG4J:
3c6a091f 2236 case LTTNG_DOMAIN_JUL:
0e115563 2237 case LTTNG_DOMAIN_PYTHON:
f60140a1 2238 nb_events = agent_list_events(events, domain);
3c6a091f
DG
2239 if (nb_events < 0) {
2240 ret = LTTNG_ERR_UST_LIST_FAIL;
2241 goto error;
2242 }
2243 break;
2f77fc4b 2244 default:
f73fabfd 2245 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2246 goto error;
2247 }
2248
2249 return nb_events;
2250
2251error:
2252 /* Return negative value to differentiate return code */
2253 return -ret;
2254}
2255
2256/*
2257 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2258 */
56a37563 2259ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain,
2f77fc4b
DG
2260 struct lttng_event_field **fields)
2261{
2262 int ret;
2263 ssize_t nb_fields = 0;
2264
2265 switch (domain) {
2266 case LTTNG_DOMAIN_UST:
2267 nb_fields = ust_app_list_event_fields(fields);
2268 if (nb_fields < 0) {
f73fabfd 2269 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
2270 goto error;
2271 }
2272 break;
2273 case LTTNG_DOMAIN_KERNEL:
2274 default: /* fall-through */
f73fabfd 2275 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2276 goto error;
2277 }
2278
2279 return nb_fields;
2280
2281error:
2282 /* Return negative value to differentiate return code */
2283 return -ret;
2284}
2285
834978fd
DG
2286ssize_t cmd_list_syscalls(struct lttng_event **events)
2287{
2288 return syscall_table_list(events);
2289}
2290
a5dfbb9d
MD
2291/*
2292 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2293 *
2294 * Called with session lock held.
2295 */
2296ssize_t cmd_list_tracker_pids(struct ltt_session *session,
56a37563 2297 enum lttng_domain_type domain, int32_t **pids)
a5dfbb9d
MD
2298{
2299 int ret;
2300 ssize_t nr_pids = 0;
2301
2302 switch (domain) {
2303 case LTTNG_DOMAIN_KERNEL:
2304 {
2305 struct ltt_kernel_session *ksess;
2306
2307 ksess = session->kernel_session;
2308 nr_pids = kernel_list_tracker_pids(ksess, pids);
2309 if (nr_pids < 0) {
2310 ret = LTTNG_ERR_KERN_LIST_FAIL;
2311 goto error;
2312 }
2313 break;
2314 }
2315 case LTTNG_DOMAIN_UST:
2316 {
2317 struct ltt_ust_session *usess;
2318
2319 usess = session->ust_session;
2320 nr_pids = trace_ust_list_tracker_pids(usess, pids);
2321 if (nr_pids < 0) {
2322 ret = LTTNG_ERR_UST_LIST_FAIL;
2323 goto error;
2324 }
2325 break;
2326 }
2327 case LTTNG_DOMAIN_LOG4J:
2328 case LTTNG_DOMAIN_JUL:
2329 case LTTNG_DOMAIN_PYTHON:
2330 default:
2331 ret = LTTNG_ERR_UND;
2332 goto error;
2333 }
2334
2335 return nr_pids;
2336
2337error:
2338 /* Return negative value to differentiate return code */
2339 return -ret;
2340}
2341
2f77fc4b
DG
2342/*
2343 * Command LTTNG_START_TRACE processed by the client thread.
a9ad0c8f
MD
2344 *
2345 * Called with session mutex held.
2f77fc4b
DG
2346 */
2347int cmd_start_trace(struct ltt_session *session)
2348{
2349 int ret;
cde3e505 2350 unsigned long nb_chan = 0;
2f77fc4b
DG
2351 struct ltt_kernel_session *ksession;
2352 struct ltt_ust_session *usess;
2f77fc4b
DG
2353
2354 assert(session);
2355
2356 /* Ease our life a bit ;) */
2357 ksession = session->kernel_session;
2358 usess = session->ust_session;
2359
8382cf6f
DG
2360 /* Is the session already started? */
2361 if (session->active) {
f73fabfd 2362 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2363 goto error;
2364 }
2365
cde3e505
DG
2366 /*
2367 * Starting a session without channel is useless since after that it's not
2368 * possible to enable channel thus inform the client.
2369 */
2370 if (usess && usess->domain_global.channels) {
2371 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
2372 }
2373 if (ksession) {
2374 nb_chan += ksession->channel_count;
2375 }
2376 if (!nb_chan) {
2377 ret = LTTNG_ERR_NO_CHANNEL;
2378 goto error;
2379 }
2380
2f77fc4b
DG
2381 /* Kernel tracing */
2382 if (ksession != NULL) {
9b6c7ec5
DG
2383 ret = start_kernel_session(ksession, kernel_tracer_fd);
2384 if (ret != LTTNG_OK) {
2f77fc4b
DG
2385 goto error;
2386 }
2f77fc4b
DG
2387 }
2388
2389 /* Flag session that trace should start automatically */
2390 if (usess) {
14fb1ebe
DG
2391 /*
2392 * Even though the start trace might fail, flag this session active so
2393 * other application coming in are started by default.
2394 */
2395 usess->active = 1;
2f77fc4b
DG
2396
2397 ret = ust_app_start_trace_all(usess);
2398 if (ret < 0) {
f73fabfd 2399 ret = LTTNG_ERR_UST_START_FAIL;
2f77fc4b
DG
2400 goto error;
2401 }
2402 }
2403
8382cf6f
DG
2404 /* Flag this after a successful start. */
2405 session->has_been_started = 1;
2406 session->active = 1;
9b6c7ec5 2407
f73fabfd 2408 ret = LTTNG_OK;
2f77fc4b
DG
2409
2410error:
2411 return ret;
2412}
2413
2414/*
2415 * Command LTTNG_STOP_TRACE processed by the client thread.
2416 */
2417int cmd_stop_trace(struct ltt_session *session)
2418{
2419 int ret;
2420 struct ltt_kernel_channel *kchan;
2421 struct ltt_kernel_session *ksession;
2422 struct ltt_ust_session *usess;
2423
2424 assert(session);
2425
2426 /* Short cut */
2427 ksession = session->kernel_session;
2428 usess = session->ust_session;
2429
8382cf6f
DG
2430 /* Session is not active. Skip everythong and inform the client. */
2431 if (!session->active) {
f73fabfd 2432 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2f77fc4b
DG
2433 goto error;
2434 }
2435
2f77fc4b 2436 /* Kernel tracer */
14fb1ebe 2437 if (ksession && ksession->active) {
2f77fc4b
DG
2438 DBG("Stop kernel tracing");
2439
566d8970
MD
2440 ret = kernel_stop_session(ksession);
2441 if (ret < 0) {
2442 ret = LTTNG_ERR_KERN_STOP_FAIL;
2443 goto error;
2444 }
2445
2446 kernel_wait_quiescent(kernel_tracer_fd);
2447
2448 /* Flush metadata after stopping (if exists) */
2f77fc4b
DG
2449 if (ksession->metadata_stream_fd >= 0) {
2450 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2451 if (ret < 0) {
2452 ERR("Kernel metadata flush failed");
2453 }
2454 }
2455
566d8970 2456 /* Flush all buffers after stopping */
2f77fc4b
DG
2457 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2458 ret = kernel_flush_buffer(kchan);
2459 if (ret < 0) {
2460 ERR("Kernel flush buffer error");
2461 }
2462 }
2463
14fb1ebe 2464 ksession->active = 0;
2f77fc4b
DG
2465 }
2466
14fb1ebe
DG
2467 if (usess && usess->active) {
2468 /*
2469 * Even though the stop trace might fail, flag this session inactive so
2470 * other application coming in are not started by default.
2471 */
2472 usess->active = 0;
2f77fc4b
DG
2473
2474 ret = ust_app_stop_trace_all(usess);
2475 if (ret < 0) {
f73fabfd 2476 ret = LTTNG_ERR_UST_STOP_FAIL;
2f77fc4b
DG
2477 goto error;
2478 }
2479 }
2480
8382cf6f
DG
2481 /* Flag inactive after a successful stop. */
2482 session->active = 0;
f73fabfd 2483 ret = LTTNG_OK;
2f77fc4b
DG
2484
2485error:
2486 return ret;
2487}
2488
2489/*
2490 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2491 */
bda32d56
JG
2492int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2493 struct lttng_uri *uris)
2f77fc4b
DG
2494{
2495 int ret, i;
2496 struct ltt_kernel_session *ksess = session->kernel_session;
2497 struct ltt_ust_session *usess = session->ust_session;
2f77fc4b
DG
2498
2499 assert(session);
2500 assert(uris);
2501 assert(nb_uri > 0);
2502
8382cf6f
DG
2503 /* Can't set consumer URI if the session is active. */
2504 if (session->active) {
f73fabfd 2505 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2506 goto error;
2507 }
2508
bda32d56 2509 /* Set the "global" consumer URIs */
2f77fc4b 2510 for (i = 0; i < nb_uri; i++) {
bda32d56
JG
2511 ret = add_uri_to_consumer(session->consumer,
2512 &uris[i], 0, session->name);
a74934ba 2513 if (ret != LTTNG_OK) {
2f77fc4b
DG
2514 goto error;
2515 }
2f77fc4b
DG
2516 }
2517
bda32d56
JG
2518 /* Set UST session URIs */
2519 if (session->ust_session) {
2520 for (i = 0; i < nb_uri; i++) {
2521 ret = add_uri_to_consumer(
2522 session->ust_session->consumer,
2523 &uris[i], LTTNG_DOMAIN_UST,
2524 session->name);
2525 if (ret != LTTNG_OK) {
2526 goto error;
2527 }
2528 }
2529 }
2530
2531 /* Set kernel session URIs */
2532 if (session->kernel_session) {
2533 for (i = 0; i < nb_uri; i++) {
2534 ret = add_uri_to_consumer(
2535 session->kernel_session->consumer,
2536 &uris[i], LTTNG_DOMAIN_KERNEL,
2537 session->name);
2538 if (ret != LTTNG_OK) {
2539 goto error;
2540 }
2541 }
2542 }
2543
7ab70fe0
DG
2544 /*
2545 * Make sure to set the session in output mode after we set URI since a
2546 * session can be created without URL (thus flagged in no output mode).
2547 */
2548 session->output_traces = 1;
2549 if (ksess) {
2550 ksess->output_traces = 1;
bda32d56
JG
2551 }
2552
2553 if (usess) {
7ab70fe0
DG
2554 usess->output_traces = 1;
2555 }
2556
2f77fc4b 2557 /* All good! */
f73fabfd 2558 ret = LTTNG_OK;
2f77fc4b
DG
2559
2560error:
2561 return ret;
2562}
2563
2564/*
2565 * Command LTTNG_CREATE_SESSION processed by the client thread.
2566 */
2567int cmd_create_session_uri(char *name, struct lttng_uri *uris,
ecc48a90 2568 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2f77fc4b
DG
2569{
2570 int ret;
2f77fc4b
DG
2571 struct ltt_session *session;
2572
2573 assert(name);
2bba9e53 2574 assert(creds);
785d2d0d 2575
2f77fc4b
DG
2576 /*
2577 * Verify if the session already exist
2578 *
2579 * XXX: There is no need for the session lock list here since the caller
2580 * (process_client_msg) is holding it. We might want to change that so a
2581 * single command does not lock the entire session list.
2582 */
2583 session = session_find_by_name(name);
2584 if (session != NULL) {
f73fabfd 2585 ret = LTTNG_ERR_EXIST_SESS;
2f77fc4b
DG
2586 goto find_error;
2587 }
2588
2589 /* Create tracing session in the registry */
dec56f6c 2590 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2f77fc4b 2591 LTTNG_SOCK_GET_GID_CRED(creds));
f73fabfd 2592 if (ret != LTTNG_OK) {
2f77fc4b
DG
2593 goto session_error;
2594 }
2595
2596 /*
2597 * Get the newly created session pointer back
2598 *
2599 * XXX: There is no need for the session lock list here since the caller
2600 * (process_client_msg) is holding it. We might want to change that so a
2601 * single command does not lock the entire session list.
2602 */
2603 session = session_find_by_name(name);
2604 assert(session);
2605
ecc48a90 2606 session->live_timer = live_timer;
2f77fc4b
DG
2607 /* Create default consumer output for the session not yet created. */
2608 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2609 if (session->consumer == NULL) {
f73fabfd 2610 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2611 goto consumer_error;
2612 }
2613
2bba9e53 2614 if (uris) {
bda32d56 2615 ret = cmd_set_consumer_uri(session, nb_uri, uris);
2bba9e53
DG
2616 if (ret != LTTNG_OK) {
2617 goto consumer_error;
2618 }
2619 session->output_traces = 1;
2620 } else {
2621 session->output_traces = 0;
2622 DBG2("Session %s created with no output", session->name);
2f77fc4b
DG
2623 }
2624
2625 session->consumer->enabled = 1;
2626
f73fabfd 2627 return LTTNG_OK;
2f77fc4b
DG
2628
2629consumer_error:
2630 session_destroy(session);
2631session_error:
2632find_error:
2633 return ret;
2634}
2635
27babd3a
DG
2636/*
2637 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2638 */
2639int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2640 size_t nb_uri, lttng_sock_cred *creds)
2641{
2642 int ret;
2643 struct ltt_session *session;
2644 struct snapshot_output *new_output = NULL;
2645
2646 assert(name);
2647 assert(creds);
2648
2649 /*
2650 * Create session in no output mode with URIs set to NULL. The uris we've
2651 * received are for a default snapshot output if one.
2652 */
ae58b817 2653 ret = cmd_create_session_uri(name, NULL, 0, creds, 0);
27babd3a
DG
2654 if (ret != LTTNG_OK) {
2655 goto error;
2656 }
2657
2658 /* Get the newly created session pointer back. This should NEVER fail. */
2659 session = session_find_by_name(name);
2660 assert(session);
2661
2662 /* Flag session for snapshot mode. */
2663 session->snapshot_mode = 1;
2664
2665 /* Skip snapshot output creation if no URI is given. */
2666 if (nb_uri == 0) {
2667 goto end;
2668 }
2669
2670 new_output = snapshot_output_alloc();
2671 if (!new_output) {
2672 ret = LTTNG_ERR_NOMEM;
2673 goto error_snapshot_alloc;
2674 }
2675
2676 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2677 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2678 if (ret < 0) {
2679 if (ret == -ENOMEM) {
2680 ret = LTTNG_ERR_NOMEM;
2681 } else {
2682 ret = LTTNG_ERR_INVALID;
2683 }
2684 goto error_snapshot;
2685 }
2686
2687 rcu_read_lock();
2688 snapshot_add_output(&session->snapshot, new_output);
2689 rcu_read_unlock();
2690
2691end:
2692 return LTTNG_OK;
2693
2694error_snapshot:
2695 snapshot_output_destroy(new_output);
2696error_snapshot_alloc:
2697 session_destroy(session);
2698error:
2699 return ret;
2700}
2701
2f77fc4b
DG
2702/*
2703 * Command LTTNG_DESTROY_SESSION processed by the client thread.
a9ad0c8f
MD
2704 *
2705 * Called with session lock held.
2f77fc4b
DG
2706 */
2707int cmd_destroy_session(struct ltt_session *session, int wpipe)
2708{
2709 int ret;
2710 struct ltt_ust_session *usess;
2711 struct ltt_kernel_session *ksess;
2712
2713 /* Safety net */
2714 assert(session);
2715
2716 usess = session->ust_session;
2717 ksess = session->kernel_session;
2718
2719 /* Clean kernel session teardown */
2720 kernel_destroy_session(ksess);
2721
2722 /* UST session teardown */
2723 if (usess) {
2724 /* Close any relayd session */
2725 consumer_output_send_destroy_relayd(usess->consumer);
2726
2727 /* Destroy every UST application related to this session. */
2728 ret = ust_app_destroy_trace_all(usess);
2729 if (ret) {
2730 ERR("Error in ust_app_destroy_trace_all");
2731 }
2732
2733 /* Clean up the rest. */
2734 trace_ust_destroy_session(usess);
2735 }
2736
2737 /*
2738 * Must notify the kernel thread here to update it's poll set in order to
2739 * remove the channel(s)' fd just destroyed.
2740 */
2741 ret = notify_thread_pipe(wpipe);
2742 if (ret < 0) {
2743 PERROR("write kernel poll pipe");
2744 }
2745
2746 ret = session_destroy(session);
2747
2748 return ret;
2749}
2750
2f77fc4b
DG
2751/*
2752 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2753 */
56a37563
JG
2754int cmd_register_consumer(struct ltt_session *session,
2755 enum lttng_domain_type domain, const char *sock_path,
2756 struct consumer_data *cdata)
2f77fc4b
DG
2757{
2758 int ret, sock;
dd81b457 2759 struct consumer_socket *socket = NULL;
2f77fc4b
DG
2760
2761 assert(session);
2762 assert(cdata);
2763 assert(sock_path);
2764
2765 switch (domain) {
2766 case LTTNG_DOMAIN_KERNEL:
2767 {
2768 struct ltt_kernel_session *ksess = session->kernel_session;
2769
2770 assert(ksess);
2771
2772 /* Can't register a consumer if there is already one */
2773 if (ksess->consumer_fds_sent != 0) {
f73fabfd 2774 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
2775 goto error;
2776 }
2777
2778 sock = lttcomm_connect_unix_sock(sock_path);
2779 if (sock < 0) {
f73fabfd 2780 ret = LTTNG_ERR_CONNECT_FAIL;
2f77fc4b
DG
2781 goto error;
2782 }
4ce514c4 2783 cdata->cmd_sock = sock;
2f77fc4b 2784
4ce514c4 2785 socket = consumer_allocate_socket(&cdata->cmd_sock);
2f77fc4b 2786 if (socket == NULL) {
f66c074c
DG
2787 ret = close(sock);
2788 if (ret < 0) {
2789 PERROR("close register consumer");
2790 }
4ce514c4 2791 cdata->cmd_sock = -1;
f73fabfd 2792 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2793 goto error;
2794 }
2795
2796 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2797 if (socket->lock == NULL) {
2798 PERROR("zmalloc pthread mutex");
f73fabfd 2799 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2800 goto error;
2801 }
2802 pthread_mutex_init(socket->lock, NULL);
2803 socket->registered = 1;
2804
2805 rcu_read_lock();
2806 consumer_add_socket(socket, ksess->consumer);
2807 rcu_read_unlock();
2808
2809 pthread_mutex_lock(&cdata->pid_mutex);
2810 cdata->pid = -1;
2811 pthread_mutex_unlock(&cdata->pid_mutex);
2812
2813 break;
2814 }
2815 default:
2816 /* TODO: Userspace tracing */
f73fabfd 2817 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2818 goto error;
2819 }
2820
dd81b457 2821 return LTTNG_OK;
2f77fc4b
DG
2822
2823error:
dd81b457
DG
2824 if (socket) {
2825 consumer_destroy_socket(socket);
2826 }
2f77fc4b
DG
2827 return ret;
2828}
2829
2830/*
2831 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2832 */
2833ssize_t cmd_list_domains(struct ltt_session *session,
2834 struct lttng_domain **domains)
2835{
2836 int ret, index = 0;
2837 ssize_t nb_dom = 0;
fefd409b
DG
2838 struct agent *agt;
2839 struct lttng_ht_iter iter;
2f77fc4b
DG
2840
2841 if (session->kernel_session != NULL) {
2842 DBG3("Listing domains found kernel domain");
2843 nb_dom++;
2844 }
2845
2846 if (session->ust_session != NULL) {
2847 DBG3("Listing domains found UST global domain");
2848 nb_dom++;
3c6a091f 2849
e0a74f01 2850 rcu_read_lock();
fefd409b
DG
2851 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2852 agt, node.node) {
2853 if (agt->being_used) {
2854 nb_dom++;
2855 }
3c6a091f 2856 }
e0a74f01 2857 rcu_read_unlock();
2f77fc4b
DG
2858 }
2859
fa64dfb4
JG
2860 if (!nb_dom) {
2861 goto end;
2862 }
2863
2f77fc4b
DG
2864 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2865 if (*domains == NULL) {
f73fabfd 2866 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2867 goto error;
2868 }
2869
2870 if (session->kernel_session != NULL) {
2871 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
b5edb9e8
PP
2872
2873 /* Kernel session buffer type is always GLOBAL */
2874 (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL;
2875
2f77fc4b
DG
2876 index++;
2877 }
2878
2879 if (session->ust_session != NULL) {
2880 (*domains)[index].type = LTTNG_DOMAIN_UST;
88c5f0d8 2881 (*domains)[index].buf_type = session->ust_session->buffer_type;
2f77fc4b 2882 index++;
3c6a091f 2883
e0a74f01 2884 rcu_read_lock();
fefd409b
DG
2885 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2886 agt, node.node) {
2887 if (agt->being_used) {
2888 (*domains)[index].type = agt->domain;
2889 (*domains)[index].buf_type = session->ust_session->buffer_type;
2890 index++;
2891 }
3c6a091f 2892 }
e0a74f01 2893 rcu_read_unlock();
2f77fc4b 2894 }
fa64dfb4 2895end:
2f77fc4b
DG
2896 return nb_dom;
2897
2898error:
f73fabfd
DG
2899 /* Return negative value to differentiate return code */
2900 return -ret;
2f77fc4b
DG
2901}
2902
2903
2904/*
2905 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2906 */
56a37563
JG
2907ssize_t cmd_list_channels(enum lttng_domain_type domain,
2908 struct ltt_session *session, struct lttng_channel **channels)
2f77fc4b 2909{
53e367f9 2910 ssize_t nb_chan = 0, payload_size = 0, ret;
2f77fc4b
DG
2911
2912 switch (domain) {
2913 case LTTNG_DOMAIN_KERNEL:
2914 if (session->kernel_session != NULL) {
2915 nb_chan = session->kernel_session->channel_count;
2916 }
2917 DBG3("Number of kernel channels %zd", nb_chan);
c7d620a2 2918 if (nb_chan <= 0) {
53e367f9
JG
2919 ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2920 goto end;
c7d620a2 2921 }
2f77fc4b
DG
2922 break;
2923 case LTTNG_DOMAIN_UST:
2924 if (session->ust_session != NULL) {
7ffc31a2 2925 rcu_read_lock();
2f77fc4b 2926 nb_chan = lttng_ht_get_count(
7ffc31a2
JG
2927 session->ust_session->domain_global.channels);
2928 rcu_read_unlock();
2f77fc4b
DG
2929 }
2930 DBG3("Number of UST global channels %zd", nb_chan);
ade7ce52 2931 if (nb_chan < 0) {
53e367f9
JG
2932 ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND;
2933 goto end;
c7d620a2 2934 }
2f77fc4b
DG
2935 break;
2936 default:
53e367f9
JG
2937 ret = -LTTNG_ERR_UND;
2938 goto end;
2f77fc4b
DG
2939 }
2940
2941 if (nb_chan > 0) {
53e367f9
JG
2942 const size_t channel_size = sizeof(struct lttng_channel) +
2943 sizeof(struct lttcomm_channel_extended);
2944 struct lttcomm_channel_extended *channel_exts;
2945
2946 payload_size = nb_chan * channel_size;
2947 *channels = zmalloc(payload_size);
2f77fc4b 2948 if (*channels == NULL) {
53e367f9
JG
2949 ret = -LTTNG_ERR_FATAL;
2950 goto end;
2f77fc4b
DG
2951 }
2952
53e367f9
JG
2953 channel_exts = ((void *) *channels) +
2954 (nb_chan * sizeof(struct lttng_channel));
2955 list_lttng_channels(domain, session, *channels, channel_exts);
2956 } else {
2957 *channels = NULL;
2f77fc4b
DG
2958 }
2959
53e367f9
JG
2960 ret = payload_size;
2961end:
2962 return ret;
2f77fc4b
DG
2963}
2964
2965/*
2966 * Command LTTNG_LIST_EVENTS processed by the client thread.
2967 */
56a37563
JG
2968ssize_t cmd_list_events(enum lttng_domain_type domain,
2969 struct ltt_session *session, char *channel_name,
b4e3ceb9 2970 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
2971{
2972 int ret = 0;
2973 ssize_t nb_event = 0;
2974
2975 switch (domain) {
2976 case LTTNG_DOMAIN_KERNEL:
2977 if (session->kernel_session != NULL) {
2978 nb_event = list_lttng_kernel_events(channel_name,
b4e3ceb9
PP
2979 session->kernel_session, events,
2980 total_size);
2f77fc4b
DG
2981 }
2982 break;
2983 case LTTNG_DOMAIN_UST:
2984 {
2985 if (session->ust_session != NULL) {
2986 nb_event = list_lttng_ust_global_events(channel_name,
b4e3ceb9
PP
2987 &session->ust_session->domain_global, events,
2988 total_size);
2f77fc4b
DG
2989 }
2990 break;
2991 }
5cdb6027 2992 case LTTNG_DOMAIN_LOG4J:
3c6a091f 2993 case LTTNG_DOMAIN_JUL:
0e115563 2994 case LTTNG_DOMAIN_PYTHON:
3c6a091f 2995 if (session->ust_session) {
fefd409b
DG
2996 struct lttng_ht_iter iter;
2997 struct agent *agt;
2998
b11feea5 2999 rcu_read_lock();
fefd409b
DG
3000 cds_lfht_for_each_entry(session->ust_session->agents->ht,
3001 &iter.iter, agt, node.node) {
1dfd9906
JG
3002 if (agt->domain == domain) {
3003 nb_event = list_lttng_agent_events(
b4e3ceb9
PP
3004 agt, events,
3005 total_size);
1dfd9906
JG
3006 break;
3007 }
fefd409b 3008 }
b11feea5 3009 rcu_read_unlock();
3c6a091f
DG
3010 }
3011 break;
2f77fc4b 3012 default:
f73fabfd 3013 ret = LTTNG_ERR_UND;
2f77fc4b
DG
3014 goto error;
3015 }
3016
f73fabfd 3017 return nb_event;
2f77fc4b
DG
3018
3019error:
f73fabfd
DG
3020 /* Return negative value to differentiate return code */
3021 return -ret;
2f77fc4b
DG
3022}
3023
3024/*
3025 * Using the session list, filled a lttng_session array to send back to the
3026 * client for session listing.
3027 *
3028 * The session list lock MUST be acquired before calling this function. Use
3029 * session_lock_list() and session_unlock_list().
3030 */
3031void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
3032 gid_t gid)
3033{
3034 int ret;
3035 unsigned int i = 0;
3036 struct ltt_session *session;
3037 struct ltt_session_list *list = session_get_list();
3038
3039 DBG("Getting all available session for UID %d GID %d",
3040 uid, gid);
3041 /*
3042 * Iterate over session list and append data after the control struct in
3043 * the buffer.
3044 */
3045 cds_list_for_each_entry(session, &list->head, list) {
3046 /*
3047 * Only list the sessions the user can control.
3048 */
3049 if (!session_access_ok(session, uid, gid)) {
3050 continue;
3051 }
3052
3053 struct ltt_kernel_session *ksess = session->kernel_session;
3054 struct ltt_ust_session *usess = session->ust_session;
3055
3056 if (session->consumer->type == CONSUMER_DST_NET ||
3057 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
3058 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
3059 ret = build_network_session_path(sessions[i].path,
dec56f6c 3060 sizeof(sessions[i].path), session);
2f77fc4b 3061 } else {
dec56f6c 3062 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2f77fc4b
DG
3063 session->consumer->dst.trace_path);
3064 }
3065 if (ret < 0) {
3066 PERROR("snprintf session path");
3067 continue;
3068 }
3069
3070 strncpy(sessions[i].name, session->name, NAME_MAX);
3071 sessions[i].name[NAME_MAX - 1] = '\0';
8382cf6f 3072 sessions[i].enabled = session->active;
2cbf8fed 3073 sessions[i].snapshot_mode = session->snapshot_mode;
8960e9cd 3074 sessions[i].live_timer_interval = session->live_timer;
2f77fc4b
DG
3075 i++;
3076 }
3077}
3078
806e2684 3079/*
6d805429 3080 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
d3f14b8a 3081 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
806e2684 3082 */
6d805429 3083int cmd_data_pending(struct ltt_session *session)
806e2684
DG
3084{
3085 int ret;
3086 struct ltt_kernel_session *ksess = session->kernel_session;
3087 struct ltt_ust_session *usess = session->ust_session;
3088
3089 assert(session);
3090
3091 /* Session MUST be stopped to ask for data availability. */
8382cf6f 3092 if (session->active) {
806e2684
DG
3093 ret = LTTNG_ERR_SESSION_STARTED;
3094 goto error;
3a89d11a
DG
3095 } else {
3096 /*
3097 * If stopped, just make sure we've started before else the above call
3098 * will always send that there is data pending.
3099 *
3100 * The consumer assumes that when the data pending command is received,
3101 * the trace has been started before or else no output data is written
3102 * by the streams which is a condition for data pending. So, this is
3103 * *VERY* important that we don't ask the consumer before a start
3104 * trace.
3105 */
8382cf6f 3106 if (!session->has_been_started) {
3a89d11a
DG
3107 ret = 0;
3108 goto error;
3109 }
806e2684
DG
3110 }
3111
3112 if (ksess && ksess->consumer) {
6d805429
DG
3113 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
3114 if (ret == 1) {
806e2684
DG
3115 /* Data is still being extracted for the kernel. */
3116 goto error;
3117 }
3118 }
3119
3120 if (usess && usess->consumer) {
6d805429
DG
3121 ret = consumer_is_data_pending(usess->id, usess->consumer);
3122 if (ret == 1) {
806e2684
DG
3123 /* Data is still being extracted for the kernel. */
3124 goto error;
3125 }
3126 }
3127
3128 /* Data is ready to be read by a viewer */
6d805429 3129 ret = 0;
806e2684
DG
3130
3131error:
3132 return ret;
3133}
3134
6dc3064a
DG
3135/*
3136 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
3137 *
3138 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3139 */
3140int cmd_snapshot_add_output(struct ltt_session *session,
3141 struct lttng_snapshot_output *output, uint32_t *id)
3142{
3143 int ret;
3144 struct snapshot_output *new_output;
3145
3146 assert(session);
3147 assert(output);
3148
3149 DBG("Cmd snapshot add output for session %s", session->name);
3150
3151 /*
903ef685 3152 * Can't create an output if the session is not set in no-output mode.
6dc3064a
DG
3153 */
3154 if (session->output_traces) {
903ef685 3155 ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
6dc3064a
DG
3156 goto error;
3157 }
3158
3159 /* Only one output is allowed until we have the "tee" feature. */
3160 if (session->snapshot.nb_output == 1) {
3161 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
3162 goto error;
3163 }
3164
3165 new_output = snapshot_output_alloc();
3166 if (!new_output) {
3167 ret = LTTNG_ERR_NOMEM;
3168 goto error;
3169 }
3170
3171 ret = snapshot_output_init(output->max_size, output->name,
3172 output->ctrl_url, output->data_url, session->consumer, new_output,
3173 &session->snapshot);
3174 if (ret < 0) {
3175 if (ret == -ENOMEM) {
3176 ret = LTTNG_ERR_NOMEM;
3177 } else {
3178 ret = LTTNG_ERR_INVALID;
3179 }
3180 goto free_error;
3181 }
3182
6dc3064a
DG
3183 rcu_read_lock();
3184 snapshot_add_output(&session->snapshot, new_output);
3185 if (id) {
3186 *id = new_output->id;
3187 }
3188 rcu_read_unlock();
3189
3190 return LTTNG_OK;
3191
3192free_error:
3193 snapshot_output_destroy(new_output);
3194error:
3195 return ret;
3196}
3197
3198/*
3199 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
3200 *
3201 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3202 */
3203int cmd_snapshot_del_output(struct ltt_session *session,
3204 struct lttng_snapshot_output *output)
3205{
3206 int ret;
eb240553 3207 struct snapshot_output *sout = NULL;
6dc3064a
DG
3208
3209 assert(session);
3210 assert(output);
3211
6dc3064a
DG
3212 rcu_read_lock();
3213
3214 /*
d3f14b8a
MD
3215 * Permission denied to create an output if the session is not
3216 * set in no output mode.
6dc3064a
DG
3217 */
3218 if (session->output_traces) {
903ef685 3219 ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
6dc3064a
DG
3220 goto error;
3221 }
3222
eb240553
DG
3223 if (output->id) {
3224 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
3225 session->name);
3226 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
3227 } else if (*output->name != '\0') {
3228 DBG("Cmd snapshot del output name %s for session %s", output->name,
3229 session->name);
3230 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
3231 }
6dc3064a
DG
3232 if (!sout) {
3233 ret = LTTNG_ERR_INVALID;
3234 goto error;
3235 }
3236
3237 snapshot_delete_output(&session->snapshot, sout);
3238 snapshot_output_destroy(sout);
3239 ret = LTTNG_OK;
3240
3241error:
3242 rcu_read_unlock();
3243 return ret;
3244}
3245
3246/*
3247 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
3248 *
3249 * If no output is available, outputs is untouched and 0 is returned.
3250 *
3251 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
3252 */
3253ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
3254 struct lttng_snapshot_output **outputs)
3255{
3256 int ret, idx = 0;
b223ca94 3257 struct lttng_snapshot_output *list = NULL;
6dc3064a
DG
3258 struct lttng_ht_iter iter;
3259 struct snapshot_output *output;
3260
3261 assert(session);
3262 assert(outputs);
3263
3264 DBG("Cmd snapshot list outputs for session %s", session->name);
3265
3266 /*
d3f14b8a
MD
3267 * Permission denied to create an output if the session is not
3268 * set in no output mode.
6dc3064a
DG
3269 */
3270 if (session->output_traces) {
903ef685
JG
3271 ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION;
3272 goto end;
6dc3064a
DG
3273 }
3274
3275 if (session->snapshot.nb_output == 0) {
3276 ret = 0;
903ef685 3277 goto end;
6dc3064a
DG
3278 }
3279
3280 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
3281 if (!list) {
b223ca94 3282 ret = -LTTNG_ERR_NOMEM;
903ef685 3283 goto end;
6dc3064a
DG
3284 }
3285
3286 /* Copy list from session to the new list object. */
b223ca94 3287 rcu_read_lock();
6dc3064a
DG
3288 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
3289 output, node.node) {
3290 assert(output->consumer);
3291 list[idx].id = output->id;
3292 list[idx].max_size = output->max_size;
6ce22875
MD
3293 if (lttng_strncpy(list[idx].name, output->name,
3294 sizeof(list[idx].name))) {
3295 ret = -LTTNG_ERR_INVALID;
903ef685 3296 goto error;
6ce22875 3297 }
6dc3064a 3298 if (output->consumer->type == CONSUMER_DST_LOCAL) {
6ce22875
MD
3299 if (lttng_strncpy(list[idx].ctrl_url,
3300 output->consumer->dst.trace_path,
3301 sizeof(list[idx].ctrl_url))) {
3302 ret = -LTTNG_ERR_INVALID;
903ef685 3303 goto error;
6ce22875 3304 }
6dc3064a
DG
3305 } else {
3306 /* Control URI. */
3307 ret = uri_to_str_url(&output->consumer->dst.net.control,
3308 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
3309 if (ret < 0) {
b223ca94 3310 ret = -LTTNG_ERR_NOMEM;
903ef685 3311 goto error;
6dc3064a
DG
3312 }
3313
3314 /* Data URI. */
3315 ret = uri_to_str_url(&output->consumer->dst.net.data,
3316 list[idx].data_url, sizeof(list[idx].data_url));
3317 if (ret < 0) {
b223ca94 3318 ret = -LTTNG_ERR_NOMEM;
903ef685 3319 goto error;
6dc3064a
DG
3320 }
3321 }
3322 idx++;
3323 }
3324
3325 *outputs = list;
b223ca94
JG
3326 list = NULL;
3327 ret = session->snapshot.nb_output;
6dc3064a 3328error:
903ef685 3329 rcu_read_unlock();
b223ca94 3330 free(list);
903ef685 3331end:
b223ca94 3332 return ret;
6dc3064a
DG
3333}
3334
93ec662e
JD
3335/*
3336 * Check if we can regenerate the metadata for this session.
3337 * Only kernel, UST per-uid and non-live sessions are supported.
3338 *
3339 * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise.
3340 */
3341static
eded6438 3342int check_regenerate_metadata_support(struct ltt_session *session)
93ec662e
JD
3343{
3344 int ret;
3345
3346 assert(session);
3347
3348 if (session->live_timer != 0) {
3349 ret = LTTNG_ERR_LIVE_SESSION;
3350 goto end;
3351 }
3352 if (!session->active) {
3353 ret = LTTNG_ERR_SESSION_NOT_STARTED;
3354 goto end;