Tests: add placeholder symbol to allow unit tests to link
[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>
b0880ae5
JG
32#include <common/dynamic-buffer.h>
33#include <common/buffer-view.h>
34#include <lttng/trigger/trigger-internal.h>
35#include <lttng/condition/condition.h>
36#include <lttng/action/action.h>
37#include <lttng/channel-internal.h>
2f77fc4b
DG
38
39#include "channel.h"
40#include "consumer.h"
41#include "event.h"
8782cc74 42#include "health-sessiond.h"
2f77fc4b
DG
43#include "kernel.h"
44#include "kernel-consumer.h"
45#include "lttng-sessiond.h"
46#include "utils.h"
834978fd 47#include "syscall.h"
7c1d2758 48#include "agent.h"
93ec662e 49#include "buffer-registry.h"
b0880ae5
JG
50#include "notification-thread.h"
51#include "notification-thread-commands.h"
2f77fc4b
DG
52
53#include "cmd.h"
54
55/*
56 * Used to keep a unique index for each relayd socket created where this value
57 * is associated with streams on the consumer so it can match the right relayd
d88aee68
DG
58 * to send to. It must be accessed with the relayd_net_seq_idx_lock
59 * held.
2f77fc4b 60 */
d88aee68
DG
61static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
62static uint64_t relayd_net_seq_idx;
2f77fc4b 63
7076b56e
JG
64static int validate_event_name(const char *);
65static int validate_ust_event_name(const char *);
66static int cmd_enable_event_internal(struct ltt_session *session,
67 struct lttng_domain *domain,
68 char *channel_name, struct lttng_event *event,
69 char *filter_expression,
70 struct lttng_filter_bytecode *filter,
71 struct lttng_event_exclusion *exclusion,
72 int wpipe);
73
2f77fc4b
DG
74/*
75 * Create a session path used by list_lttng_sessions for the case that the
76 * session consumer is on the network.
77 */
78static int build_network_session_path(char *dst, size_t size,
79 struct ltt_session *session)
80{
81 int ret, kdata_port, udata_port;
82 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
83 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
84
85 assert(session);
86 assert(dst);
87
88 memset(tmp_urls, 0, sizeof(tmp_urls));
89 memset(tmp_uurl, 0, sizeof(tmp_uurl));
90
91 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
92
93 if (session->kernel_session && session->kernel_session->consumer) {
94 kuri = &session->kernel_session->consumer->dst.net.control;
95 kdata_port = session->kernel_session->consumer->dst.net.data.port;
96 }
97
98 if (session->ust_session && session->ust_session->consumer) {
99 uuri = &session->ust_session->consumer->dst.net.control;
100 udata_port = session->ust_session->consumer->dst.net.data.port;
101 }
102
103 if (uuri == NULL && kuri == NULL) {
104 uri = &session->consumer->dst.net.control;
105 kdata_port = session->consumer->dst.net.data.port;
106 } else if (kuri && uuri) {
107 ret = uri_compare(kuri, uuri);
108 if (ret) {
109 /* Not Equal */
110 uri = kuri;
111 /* Build uuri URL string */
112 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
113 if (ret < 0) {
114 goto error;
115 }
116 } else {
117 uri = kuri;
118 }
119 } else if (kuri && uuri == NULL) {
120 uri = kuri;
121 } else if (uuri && kuri == NULL) {
122 uri = uuri;
123 }
124
125 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
126 if (ret < 0) {
127 goto error;
128 }
129
9aa9f900
DG
130 /*
131 * Do we have a UST url set. If yes, this means we have both kernel and UST
132 * to print.
133 */
9d035200 134 if (*tmp_uurl != '\0') {
2f77fc4b
DG
135 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
136 tmp_urls, kdata_port, tmp_uurl, udata_port);
137 } else {
9aa9f900 138 int dport;
bef08707 139 if (kuri || (!kuri && !uuri)) {
9aa9f900
DG
140 dport = kdata_port;
141 } else {
142 /* No kernel URI, use the UST port. */
143 dport = udata_port;
144 }
145 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
2f77fc4b
DG
146 }
147
148error:
149 return ret;
150}
151
fb83fe64
JD
152/*
153 * Get run-time attributes if the session has been started (discarded events,
154 * lost packets).
155 */
156static int get_kernel_runtime_stats(struct ltt_session *session,
157 struct ltt_kernel_channel *kchan, uint64_t *discarded_events,
158 uint64_t *lost_packets)
159{
160 int ret;
161
162 if (!session->has_been_started) {
163 ret = 0;
164 *discarded_events = 0;
165 *lost_packets = 0;
166 goto end;
167 }
168
169 ret = consumer_get_discarded_events(session->id, kchan->fd,
170 session->kernel_session->consumer,
171 discarded_events);
172 if (ret < 0) {
173 goto end;
174 }
175
176 ret = consumer_get_lost_packets(session->id, kchan->fd,
177 session->kernel_session->consumer,
178 lost_packets);
179 if (ret < 0) {
180 goto end;
181 }
182
183end:
184 return ret;
185}
186
187/*
188 * Get run-time attributes if the session has been started (discarded events,
189 * lost packets).
190 */
191static int get_ust_runtime_stats(struct ltt_session *session,
192 struct ltt_ust_channel *uchan, uint64_t *discarded_events,
193 uint64_t *lost_packets)
194{
195 int ret;
196 struct ltt_ust_session *usess;
197
a91c5803
JG
198 if (!discarded_events || !lost_packets) {
199 ret = -1;
200 goto end;
201 }
202
fb83fe64 203 usess = session->ust_session;
a905c624
JG
204 assert(discarded_events);
205 assert(lost_packets);
fb83fe64
JD
206
207 if (!usess || !session->has_been_started) {
208 *discarded_events = 0;
209 *lost_packets = 0;
210 ret = 0;
211 goto end;
212 }
213
214 if (usess->buffer_type == LTTNG_BUFFER_PER_UID) {
215 ret = ust_app_uid_get_channel_runtime_stats(usess->id,
216 &usess->buffer_reg_uid_list,
217 usess->consumer, uchan->id,
218 uchan->attr.overwrite,
219 discarded_events,
220 lost_packets);
221 } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) {
222 ret = ust_app_pid_get_channel_runtime_stats(usess,
223 uchan, usess->consumer,
224 uchan->attr.overwrite,
225 discarded_events,
226 lost_packets);
227 if (ret < 0) {
228 goto end;
229 }
230 *discarded_events += uchan->per_pid_closed_app_discarded;
231 *lost_packets += uchan->per_pid_closed_app_lost;
232 } else {
233 ERR("Unsupported buffer type");
967bc289 234 assert(0);
fb83fe64
JD
235 ret = -1;
236 goto end;
237 }
238
239end:
240 return ret;
241}
242
2f77fc4b
DG
243/*
244 * Fill lttng_channel array of all channels.
245 */
56a37563 246static void list_lttng_channels(enum lttng_domain_type domain,
fb83fe64
JD
247 struct ltt_session *session, struct lttng_channel *channels,
248 struct lttcomm_channel_extended *chan_exts)
2f77fc4b 249{
fb83fe64 250 int i = 0, ret;
2f77fc4b
DG
251 struct ltt_kernel_channel *kchan;
252
253 DBG("Listing channels for session %s", session->name);
254
255 switch (domain) {
256 case LTTNG_DOMAIN_KERNEL:
257 /* Kernel channels */
258 if (session->kernel_session != NULL) {
259 cds_list_for_each_entry(kchan,
260 &session->kernel_session->channel_list.head, list) {
fb83fe64
JD
261 uint64_t discarded_events, lost_packets;
262
263 ret = get_kernel_runtime_stats(session, kchan,
264 &discarded_events, &lost_packets);
265 if (ret < 0) {
266 goto end;
267 }
2f77fc4b
DG
268 /* Copy lttng_channel struct to array */
269 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
270 channels[i].enabled = kchan->enabled;
fb83fe64
JD
271 chan_exts[i].discarded_events =
272 discarded_events;
273 chan_exts[i].lost_packets = lost_packets;
2f77fc4b
DG
274 i++;
275 }
276 }
277 break;
278 case LTTNG_DOMAIN_UST:
279 {
280 struct lttng_ht_iter iter;
281 struct ltt_ust_channel *uchan;
282
e7fe706f 283 rcu_read_lock();
2f77fc4b
DG
284 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
285 &iter.iter, uchan, node.node) {
a91c5803 286 uint64_t discarded_events = 0, lost_packets = 0;
fb83fe64 287
8ee609c8
MD
288 if (lttng_strncpy(channels[i].name, uchan->name,
289 LTTNG_SYMBOL_NAME_LEN)) {
290 break;
291 }
2f77fc4b
DG
292 channels[i].attr.overwrite = uchan->attr.overwrite;
293 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
294 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
295 channels[i].attr.switch_timer_interval =
296 uchan->attr.switch_timer_interval;
297 channels[i].attr.read_timer_interval =
298 uchan->attr.read_timer_interval;
299 channels[i].enabled = uchan->enabled;
2f785fe7
DG
300 channels[i].attr.tracefile_size = uchan->tracefile_size;
301 channels[i].attr.tracefile_count = uchan->tracefile_count;
5e4435a4
JG
302
303 /*
304 * Map enum lttng_ust_output to enum lttng_event_output.
305 */
2f77fc4b
DG
306 switch (uchan->attr.output) {
307 case LTTNG_UST_MMAP:
2f77fc4b
DG
308 channels[i].attr.output = LTTNG_EVENT_MMAP;
309 break;
5e4435a4
JG
310 default:
311 /*
312 * LTTNG_UST_MMAP is the only supported UST
313 * output mode.
314 */
315 assert(0);
316 break;
2f77fc4b 317 }
fb83fe64
JD
318
319 ret = get_ust_runtime_stats(session, uchan,
320 &discarded_events, &lost_packets);
321 if (ret < 0) {
322 break;
323 }
324 chan_exts[i].discarded_events = discarded_events;
325 chan_exts[i].lost_packets = lost_packets;
2f77fc4b
DG
326 i++;
327 }
e7fe706f 328 rcu_read_unlock();
2f77fc4b
DG
329 break;
330 }
331 default:
332 break;
333 }
fb83fe64
JD
334
335end:
336 return;
2f77fc4b
DG
337}
338
b4e3ceb9 339static void increment_extended_len(const char *filter_expression,
795d57ce 340 struct lttng_event_exclusion *exclusion, size_t *extended_len)
b4e3ceb9
PP
341{
342 *extended_len += sizeof(struct lttcomm_event_extended_header);
343
344 if (filter_expression) {
345 *extended_len += strlen(filter_expression) + 1;
346 }
795d57ce
PP
347
348 if (exclusion) {
349 *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN;
350 }
b4e3ceb9
PP
351}
352
353static void append_extended_info(const char *filter_expression,
795d57ce 354 struct lttng_event_exclusion *exclusion, void **extended_at)
b4e3ceb9
PP
355{
356 struct lttcomm_event_extended_header extended_header;
357 size_t filter_len = 0;
795d57ce 358 size_t nb_exclusions = 0;
b4e3ceb9
PP
359
360 if (filter_expression) {
361 filter_len = strlen(filter_expression) + 1;
362 }
363
795d57ce
PP
364 if (exclusion) {
365 nb_exclusions = exclusion->count;
366 }
367
368 /* Set header fields */
b4e3ceb9 369 extended_header.filter_len = filter_len;
795d57ce
PP
370 extended_header.nb_exclusions = nb_exclusions;
371
372 /* Copy header */
b4e3ceb9
PP
373 memcpy(*extended_at, &extended_header, sizeof(extended_header));
374 *extended_at += sizeof(extended_header);
795d57ce
PP
375
376 /* Copy filter string */
377 if (filter_expression) {
378 memcpy(*extended_at, filter_expression, filter_len);
379 *extended_at += filter_len;
380 }
381
382 /* Copy exclusion names */
383 if (exclusion) {
384 size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
385
386 memcpy(*extended_at, &exclusion->names, len);
387 *extended_at += len;
388 }
b4e3ceb9
PP
389}
390
3c6a091f 391/*
022d91ba 392 * Create a list of agent domain events.
3c6a091f
DG
393 *
394 * Return number of events in list on success or else a negative value.
395 */
022d91ba 396static int list_lttng_agent_events(struct agent *agt,
b4e3ceb9 397 struct lttng_event **events, size_t *total_size)
3c6a091f
DG
398{
399 int i = 0, ret = 0;
400 unsigned int nb_event = 0;
022d91ba 401 struct agent_event *event;
3c6a091f
DG
402 struct lttng_event *tmp_events;
403 struct lttng_ht_iter iter;
b4e3ceb9
PP
404 size_t extended_len = 0;
405 void *extended_at;
3c6a091f 406
022d91ba 407 assert(agt);
3c6a091f
DG
408 assert(events);
409
022d91ba 410 DBG3("Listing agent events");
3c6a091f 411
e5bbf678 412 rcu_read_lock();
022d91ba 413 nb_event = lttng_ht_get_count(agt->events);
e5bbf678 414 rcu_read_unlock();
3c6a091f
DG
415 if (nb_event == 0) {
416 ret = nb_event;
b4e3ceb9 417 *total_size = 0;
3c6a091f
DG
418 goto error;
419 }
420
b4e3ceb9
PP
421 /* Compute required extended infos size */
422 extended_len = nb_event * sizeof(struct lttcomm_event_extended_header);
423
424 /*
425 * This is only valid because the commands which add events are
426 * processed in the same thread as the listing.
427 */
428 rcu_read_lock();
429 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
795d57ce
PP
430 increment_extended_len(event->filter_expression, NULL,
431 &extended_len);
b4e3ceb9
PP
432 }
433 rcu_read_unlock();
434
435 *total_size = nb_event * sizeof(*tmp_events) + extended_len;
436 tmp_events = zmalloc(*total_size);
3c6a091f 437 if (!tmp_events) {
022d91ba 438 PERROR("zmalloc agent events session");
3c6a091f
DG
439 ret = -LTTNG_ERR_FATAL;
440 goto error;
441 }
442
b4e3ceb9
PP
443 extended_at = ((uint8_t *) tmp_events) +
444 nb_event * sizeof(struct lttng_event);
445
3c6a091f 446 rcu_read_lock();
022d91ba 447 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
3c6a091f
DG
448 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
449 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
450 tmp_events[i].enabled = event->enabled;
2106efa0 451 tmp_events[i].loglevel = event->loglevel_value;
ff94328f 452 tmp_events[i].loglevel_type = event->loglevel_type;
3c6a091f 453 i++;
b4e3ceb9
PP
454
455 /* Append extended info */
795d57ce
PP
456 append_extended_info(event->filter_expression, NULL,
457 &extended_at);
3c6a091f
DG
458 }
459 rcu_read_unlock();
460
461 *events = tmp_events;
462 ret = nb_event;
463
464error:
465 assert(nb_event == i);
466 return ret;
467}
468
2f77fc4b
DG
469/*
470 * Create a list of ust global domain events.
471 */
472static int list_lttng_ust_global_events(char *channel_name,
b4e3ceb9
PP
473 struct ltt_ust_domain_global *ust_global,
474 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
475{
476 int i = 0, ret = 0;
477 unsigned int nb_event = 0;
478 struct lttng_ht_iter iter;
479 struct lttng_ht_node_str *node;
480 struct ltt_ust_channel *uchan;
481 struct ltt_ust_event *uevent;
482 struct lttng_event *tmp;
b4e3ceb9
PP
483 size_t extended_len = 0;
484 void *extended_at;
2f77fc4b
DG
485
486 DBG("Listing UST global events for channel %s", channel_name);
487
488 rcu_read_lock();
489
490 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
491 node = lttng_ht_iter_get_node_str(&iter);
492 if (node == NULL) {
f73fabfd 493 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
d31d3e8c 494 goto end;
2f77fc4b
DG
495 }
496
497 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
498
3c442be3 499 nb_event = lttng_ht_get_count(uchan->events);
2f77fc4b
DG
500 if (nb_event == 0) {
501 ret = nb_event;
b4e3ceb9 502 *total_size = 0;
d31d3e8c 503 goto end;
2f77fc4b
DG
504 }
505
506 DBG3("Listing UST global %d events", nb_event);
507
b4e3ceb9
PP
508 /* Compute required extended infos size */
509 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
510 if (uevent->internal) {
511 nb_event--;
512 continue;
513 }
514
515 increment_extended_len(uevent->filter_expression,
795d57ce 516 uevent->exclusion, &extended_len);
b4e3ceb9 517 }
d31d3e8c
PP
518 if (nb_event == 0) {
519 /* All events are internal, skip. */
520 ret = 0;
521 *total_size = 0;
522 goto end;
523 }
b4e3ceb9
PP
524
525 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
526 tmp = zmalloc(*total_size);
2f77fc4b 527 if (tmp == NULL) {
b12c38df
JG
528 ret = -LTTNG_ERR_FATAL;
529 goto end;
2f77fc4b
DG
530 }
531
b4e3ceb9
PP
532 extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event);
533
2f77fc4b 534 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
3c442be3
JG
535 if (uevent->internal) {
536 /* This event should remain hidden from clients */
3c442be3
JG
537 continue;
538 }
2f77fc4b
DG
539 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
540 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
541 tmp[i].enabled = uevent->enabled;
542
543 switch (uevent->attr.instrumentation) {
544 case LTTNG_UST_TRACEPOINT:
545 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
546 break;
547 case LTTNG_UST_PROBE:
548 tmp[i].type = LTTNG_EVENT_PROBE;
549 break;
550 case LTTNG_UST_FUNCTION:
551 tmp[i].type = LTTNG_EVENT_FUNCTION;
552 break;
553 }
554
555 tmp[i].loglevel = uevent->attr.loglevel;
556 switch (uevent->attr.loglevel_type) {
557 case LTTNG_UST_LOGLEVEL_ALL:
558 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
559 break;
560 case LTTNG_UST_LOGLEVEL_RANGE:
561 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
562 break;
563 case LTTNG_UST_LOGLEVEL_SINGLE:
564 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
565 break;
566 }
567 if (uevent->filter) {
568 tmp[i].filter = 1;
569 }
4634f12e
JI
570 if (uevent->exclusion) {
571 tmp[i].exclusion = 1;
572 }
2f77fc4b 573 i++;
b4e3ceb9
PP
574
575 /* Append extended info */
795d57ce
PP
576 append_extended_info(uevent->filter_expression,
577 uevent->exclusion, &extended_at);
2f77fc4b
DG
578 }
579
580 ret = nb_event;
581 *events = tmp;
d31d3e8c 582end:
2f77fc4b
DG
583 rcu_read_unlock();
584 return ret;
585}
586
587/*
588 * Fill lttng_event array of all kernel events in the channel.
589 */
590static int list_lttng_kernel_events(char *channel_name,
b4e3ceb9
PP
591 struct ltt_kernel_session *kernel_session,
592 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
593{
594 int i = 0, ret;
595 unsigned int nb_event;
596 struct ltt_kernel_event *event;
597 struct ltt_kernel_channel *kchan;
b4e3ceb9
PP
598 size_t extended_len = 0;
599 void *extended_at;
2f77fc4b
DG
600
601 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
602 if (kchan == NULL) {
f73fabfd 603 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG
604 goto error;
605 }
606
607 nb_event = kchan->event_count;
608
609 DBG("Listing events for channel %s", kchan->channel->name);
610
611 if (nb_event == 0) {
b4e3ceb9 612 *total_size = 0;
834978fd 613 *events = NULL;
db906c12 614 goto end;
2f77fc4b
DG
615 }
616
b4e3ceb9
PP
617 /* Compute required extended infos size */
618 cds_list_for_each_entry(event, &kchan->events_list.head, list) {
795d57ce
PP
619 increment_extended_len(event->filter_expression, NULL,
620 &extended_len);
b4e3ceb9
PP
621 }
622
623 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
624 *events = zmalloc(*total_size);
2f77fc4b 625 if (*events == NULL) {
f73fabfd 626 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
627 goto error;
628 }
629
ab4aa612 630 extended_at = ((void *) *events) +
b4e3ceb9
PP
631 nb_event * sizeof(struct lttng_event);
632
2f77fc4b
DG
633 /* Kernel channels */
634 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
635 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
636 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
637 (*events)[i].enabled = event->enabled;
00f992f2
JG
638 (*events)[i].filter =
639 (unsigned char) !!event->filter_expression;
2f77fc4b
DG
640
641 switch (event->event->instrumentation) {
642 case LTTNG_KERNEL_TRACEPOINT:
643 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
644 break;
2f77fc4b 645 case LTTNG_KERNEL_KRETPROBE:
1896972b
DG
646 (*events)[i].type = LTTNG_EVENT_FUNCTION;
647 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
648 sizeof(struct lttng_kernel_kprobe));
649 break;
650 case LTTNG_KERNEL_KPROBE:
2f77fc4b
DG
651 (*events)[i].type = LTTNG_EVENT_PROBE;
652 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
653 sizeof(struct lttng_kernel_kprobe));
654 break;
655 case LTTNG_KERNEL_FUNCTION:
656 (*events)[i].type = LTTNG_EVENT_FUNCTION;
657 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
658 sizeof(struct lttng_kernel_function));
659 break;
660 case LTTNG_KERNEL_NOOP:
661 (*events)[i].type = LTTNG_EVENT_NOOP;
662 break;
663 case LTTNG_KERNEL_SYSCALL:
664 (*events)[i].type = LTTNG_EVENT_SYSCALL;
665 break;
666 case LTTNG_KERNEL_ALL:
667 assert(0);
668 break;
669 }
670 i++;
b4e3ceb9
PP
671
672 /* Append extended info */
795d57ce
PP
673 append_extended_info(event->filter_expression, NULL,
674 &extended_at);
2f77fc4b
DG
675 }
676
db906c12 677end:
2f77fc4b
DG
678 return nb_event;
679
680error:
f73fabfd
DG
681 /* Negate the error code to differentiate the size from an error */
682 return -ret;
2f77fc4b
DG
683}
684
685/*
686 * Add URI so the consumer output object. Set the correct path depending on the
687 * domain adding the default trace directory.
688 */
689static int add_uri_to_consumer(struct consumer_output *consumer,
56a37563
JG
690 struct lttng_uri *uri, enum lttng_domain_type domain,
691 const char *session_name)
2f77fc4b 692{
f73fabfd 693 int ret = LTTNG_OK;
2f77fc4b
DG
694 const char *default_trace_dir;
695
696 assert(uri);
697
698 if (consumer == NULL) {
699 DBG("No consumer detected. Don't add URI. Stopping.");
f73fabfd 700 ret = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
701 goto error;
702 }
703
704 switch (domain) {
705 case LTTNG_DOMAIN_KERNEL:
706 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
707 break;
708 case LTTNG_DOMAIN_UST:
709 default_trace_dir = DEFAULT_UST_TRACE_DIR;
710 break;
711 default:
712 /*
713 * This case is possible is we try to add the URI to the global tracing
714 * session consumer object which in this case there is no subdir.
715 */
716 default_trace_dir = "";
717 }
718
719 switch (uri->dtype) {
720 case LTTNG_DST_IPV4:
721 case LTTNG_DST_IPV6:
722 DBG2("Setting network URI to consumer");
723
df75acac
DG
724 if (consumer->type == CONSUMER_DST_NET) {
725 if ((uri->stype == LTTNG_STREAM_CONTROL &&
785d2d0d
DG
726 consumer->dst.net.control_isset) ||
727 (uri->stype == LTTNG_STREAM_DATA &&
728 consumer->dst.net.data_isset)) {
df75acac
DG
729 ret = LTTNG_ERR_URL_EXIST;
730 goto error;
731 }
732 } else {
733 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
785d2d0d
DG
734 }
735
df75acac
DG
736 consumer->type = CONSUMER_DST_NET;
737
2f77fc4b
DG
738 /* Set URI into consumer output object */
739 ret = consumer_set_network_uri(consumer, uri);
740 if (ret < 0) {
a74934ba 741 ret = -ret;
2f77fc4b
DG
742 goto error;
743 } else if (ret == 1) {
744 /*
745 * URI was the same in the consumer so we do not append the subdir
746 * again so to not duplicate output dir.
747 */
f86c9f4e 748 ret = LTTNG_OK;
2f77fc4b
DG
749 goto error;
750 }
751
752 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
753 ret = consumer_set_subdir(consumer, session_name);
754 if (ret < 0) {
f73fabfd 755 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
756 goto error;
757 }
758 }
759
760 if (uri->stype == LTTNG_STREAM_CONTROL) {
761 /* On a new subdir, reappend the default trace dir. */
c30ce0b3
CB
762 strncat(consumer->subdir, default_trace_dir,
763 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2f77fc4b
DG
764 DBG3("Append domain trace name to subdir %s", consumer->subdir);
765 }
766
767 break;
768 case LTTNG_DST_PATH:
769 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
770 memset(consumer->dst.trace_path, 0,
771 sizeof(consumer->dst.trace_path));
9ac05d92
MD
772 /* Explicit length checks for strcpy and strcat. */
773 if (strlen(uri->dst.path) + strlen(default_trace_dir)
774 >= sizeof(consumer->dst.trace_path)) {
775 ret = LTTNG_ERR_FATAL;
776 goto error;
777 }
778 strcpy(consumer->dst.trace_path, uri->dst.path);
2f77fc4b 779 /* Append default trace dir */
9ac05d92 780 strcat(consumer->dst.trace_path, default_trace_dir);
2f77fc4b
DG
781 /* Flag consumer as local. */
782 consumer->type = CONSUMER_DST_LOCAL;
783 break;
784 }
785
a74934ba
DG
786 ret = LTTNG_OK;
787
2f77fc4b
DG
788error:
789 return ret;
790}
791
792/*
793 * Init tracing by creating trace directory and sending fds kernel consumer.
794 */
795static int init_kernel_tracing(struct ltt_kernel_session *session)
796{
797 int ret = 0;
798 struct lttng_ht_iter iter;
799 struct consumer_socket *socket;
800
801 assert(session);
802
e7fe706f
DG
803 rcu_read_lock();
804
2f77fc4b
DG
805 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
806 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
807 socket, node.node) {
2f77fc4b 808 pthread_mutex_lock(socket->lock);
f50f23d9 809 ret = kernel_consumer_send_session(socket, session);
2f77fc4b
DG
810 pthread_mutex_unlock(socket->lock);
811 if (ret < 0) {
f73fabfd 812 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
813 goto error;
814 }
815 }
816 }
817
818error:
e7fe706f 819 rcu_read_unlock();
2f77fc4b
DG
820 return ret;
821}
822
823/*
824 * Create a socket to the relayd using the URI.
825 *
826 * On success, the relayd_sock pointer is set to the created socket.
827 * Else, it's stays untouched and a lttcomm error code is returned.
828 */
6151a90f 829static int create_connect_relayd(struct lttng_uri *uri,
b31610f2
JD
830 struct lttcomm_relayd_sock **relayd_sock,
831 struct consumer_output *consumer)
2f77fc4b
DG
832{
833 int ret;
6151a90f 834 struct lttcomm_relayd_sock *rsock;
2f77fc4b 835
6151a90f
JD
836 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
837 RELAYD_VERSION_COMM_MINOR);
838 if (!rsock) {
f73fabfd 839 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
840 goto error;
841 }
842
ffe60014
DG
843 /*
844 * Connect to relayd so we can proceed with a session creation. This call
845 * can possibly block for an arbitrary amount of time to set the health
846 * state to be in poll execution.
847 */
848 health_poll_entry();
6151a90f 849 ret = relayd_connect(rsock);
ffe60014 850 health_poll_exit();
2f77fc4b
DG
851 if (ret < 0) {
852 ERR("Unable to reach lttng-relayd");
f73fabfd 853 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG
854 goto free_sock;
855 }
856
857 /* Create socket for control stream. */
858 if (uri->stype == LTTNG_STREAM_CONTROL) {
859 DBG3("Creating relayd stream socket from URI");
860
861 /* Check relayd version */
6151a90f 862 ret = relayd_version_check(rsock);
2f77fc4b 863 if (ret < 0) {
f73fabfd 864 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
2f77fc4b
DG
865 goto close_sock;
866 }
b31610f2
JD
867 consumer->relay_major_version = rsock->major;
868 consumer->relay_minor_version = rsock->minor;
2f77fc4b
DG
869 } else if (uri->stype == LTTNG_STREAM_DATA) {
870 DBG3("Creating relayd data socket from URI");
871 } else {
872 /* Command is not valid */
873 ERR("Relayd invalid stream type: %d", uri->stype);
f73fabfd 874 ret = LTTNG_ERR_INVALID;
2f77fc4b
DG
875 goto close_sock;
876 }
877
6151a90f 878 *relayd_sock = rsock;
2f77fc4b 879
f73fabfd 880 return LTTNG_OK;
2f77fc4b
DG
881
882close_sock:
6151a90f
JD
883 /* The returned value is not useful since we are on an error path. */
884 (void) relayd_close(rsock);
2f77fc4b 885free_sock:
6151a90f 886 free(rsock);
2f77fc4b
DG
887error:
888 return ret;
889}
890
891/*
892 * Connect to the relayd using URI and send the socket to the right consumer.
893 */
56a37563
JG
894static int send_consumer_relayd_socket(enum lttng_domain_type domain,
895 unsigned int session_id, struct lttng_uri *relayd_uri,
896 struct consumer_output *consumer,
d3e2ba59
JD
897 struct consumer_socket *consumer_sock,
898 char *session_name, char *hostname, int session_live_timer)
2f77fc4b
DG
899{
900 int ret;
6151a90f 901 struct lttcomm_relayd_sock *rsock = NULL;
2f77fc4b 902
ffe60014 903 /* Connect to relayd and make version check if uri is the control. */
b31610f2 904 ret = create_connect_relayd(relayd_uri, &rsock, consumer);
ffe60014 905 if (ret != LTTNG_OK) {
6151a90f 906 goto error;
ffe60014 907 }
6151a90f 908 assert(rsock);
ffe60014 909
2f77fc4b 910 /* Set the network sequence index if not set. */
d88aee68
DG
911 if (consumer->net_seq_index == (uint64_t) -1ULL) {
912 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
913 /*
914 * Increment net_seq_idx because we are about to transfer the
915 * new relayd socket to the consumer.
d88aee68 916 * Assign unique key so the consumer can match streams.
2f77fc4b 917 */
d88aee68
DG
918 consumer->net_seq_index = ++relayd_net_seq_idx;
919 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
920 }
921
2f77fc4b 922 /* Send relayd socket to consumer. */
6151a90f 923 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
d3e2ba59
JD
924 relayd_uri->stype, session_id,
925 session_name, hostname, session_live_timer);
2f77fc4b 926 if (ret < 0) {
f73fabfd 927 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
928 goto close_sock;
929 }
930
c890b720
DG
931 /* Flag that the corresponding socket was sent. */
932 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
ffe60014 933 consumer_sock->control_sock_sent = 1;
c890b720 934 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
ffe60014 935 consumer_sock->data_sock_sent = 1;
c890b720
DG
936 }
937
f73fabfd 938 ret = LTTNG_OK;
2f77fc4b
DG
939
940 /*
941 * Close socket which was dup on the consumer side. The session daemon does
942 * NOT keep track of the relayd socket(s) once transfer to the consumer.
943 */
944
945close_sock:
6151a90f
JD
946 (void) relayd_close(rsock);
947 free(rsock);
2f77fc4b 948
6151a90f 949error:
ffe60014
DG
950 if (ret != LTTNG_OK) {
951 /*
d9078d0c
DG
952 * The consumer output for this session should not be used anymore
953 * since the relayd connection failed thus making any tracing or/and
954 * streaming not usable.
ffe60014 955 */
d9078d0c 956 consumer->enabled = 0;
ffe60014 957 }
2f77fc4b
DG
958 return ret;
959}
960
961/*
962 * Send both relayd sockets to a specific consumer and domain. This is a
963 * helper function to facilitate sending the information to the consumer for a
964 * session.
965 */
56a37563
JG
966static int send_consumer_relayd_sockets(enum lttng_domain_type domain,
967 unsigned int session_id, struct consumer_output *consumer,
968 struct consumer_socket *sock, char *session_name,
969 char *hostname, int session_live_timer)
2f77fc4b 970{
dda67f6c 971 int ret = LTTNG_OK;
2f77fc4b 972
2f77fc4b 973 assert(consumer);
6dc3064a 974 assert(sock);
2f77fc4b 975
2f77fc4b 976 /* Sending control relayd socket. */
ffe60014 977 if (!sock->control_sock_sent) {
6dc3064a 978 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD
979 &consumer->dst.net.control, consumer, sock,
980 session_name, hostname, session_live_timer);
c890b720
DG
981 if (ret != LTTNG_OK) {
982 goto error;
983 }
2f77fc4b
DG
984 }
985
986 /* Sending data relayd socket. */
ffe60014 987 if (!sock->data_sock_sent) {
6dc3064a 988 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD
989 &consumer->dst.net.data, consumer, sock,
990 session_name, hostname, session_live_timer);
c890b720
DG
991 if (ret != LTTNG_OK) {
992 goto error;
993 }
2f77fc4b
DG
994 }
995
2f77fc4b
DG
996error:
997 return ret;
998}
999
1000/*
1001 * Setup relayd connections for a tracing session. First creates the socket to
1002 * the relayd and send them to the right domain consumer. Consumer type MUST be
1003 * network.
1004 */
ffe60014 1005int cmd_setup_relayd(struct ltt_session *session)
2f77fc4b 1006{
f73fabfd 1007 int ret = LTTNG_OK;
2f77fc4b
DG
1008 struct ltt_ust_session *usess;
1009 struct ltt_kernel_session *ksess;
1010 struct consumer_socket *socket;
1011 struct lttng_ht_iter iter;
1012
1013 assert(session);
1014
1015 usess = session->ust_session;
1016 ksess = session->kernel_session;
1017
785d2d0d 1018 DBG("Setting relayd for session %s", session->name);
2f77fc4b 1019
e7fe706f
DG
1020 rcu_read_lock();
1021
2f77fc4b
DG
1022 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
1023 && usess->consumer->enabled) {
1024 /* For each consumer socket, send relayd sockets */
1025 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
1026 socket, node.node) {
2f77fc4b 1027 pthread_mutex_lock(socket->lock);
6dc3064a 1028 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
d3e2ba59
JD
1029 usess->consumer, socket,
1030 session->name, session->hostname,
1031 session->live_timer);
2f77fc4b 1032 pthread_mutex_unlock(socket->lock);
f73fabfd 1033 if (ret != LTTNG_OK) {
2f77fc4b
DG
1034 goto error;
1035 }
6dc3064a
DG
1036 /* Session is now ready for network streaming. */
1037 session->net_handle = 1;
2f77fc4b 1038 }
b31610f2
JD
1039 session->consumer->relay_major_version =
1040 usess->consumer->relay_major_version;
1041 session->consumer->relay_minor_version =
1042 usess->consumer->relay_minor_version;
2f77fc4b
DG
1043 }
1044
1045 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
1046 && ksess->consumer->enabled) {
1047 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
1048 socket, node.node) {
2f77fc4b 1049 pthread_mutex_lock(socket->lock);
6dc3064a 1050 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
d3e2ba59
JD
1051 ksess->consumer, socket,
1052 session->name, session->hostname,
1053 session->live_timer);
2f77fc4b 1054 pthread_mutex_unlock(socket->lock);
f73fabfd 1055 if (ret != LTTNG_OK) {
2f77fc4b
DG
1056 goto error;
1057 }
6dc3064a
DG
1058 /* Session is now ready for network streaming. */
1059 session->net_handle = 1;
2f77fc4b 1060 }
b31610f2
JD
1061 session->consumer->relay_major_version =
1062 ksess->consumer->relay_major_version;
1063 session->consumer->relay_minor_version =
1064 ksess->consumer->relay_minor_version;
2f77fc4b
DG
1065 }
1066
1067error:
e7fe706f 1068 rcu_read_unlock();
2f77fc4b
DG
1069 return ret;
1070}
1071
9b6c7ec5
DG
1072/*
1073 * Start a kernel session by opening all necessary streams.
1074 */
1075static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
1076{
1077 int ret;
1078 struct ltt_kernel_channel *kchan;
1079
1080 /* Open kernel metadata */
07b86b52 1081 if (ksess->metadata == NULL && ksess->output_traces) {
9b6c7ec5
DG
1082 ret = kernel_open_metadata(ksess);
1083 if (ret < 0) {
1084 ret = LTTNG_ERR_KERN_META_FAIL;
1085 goto error;
1086 }
1087 }
1088
1089 /* Open kernel metadata stream */
07b86b52 1090 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
9b6c7ec5
DG
1091 ret = kernel_open_metadata_stream(ksess);
1092 if (ret < 0) {
1093 ERR("Kernel create metadata stream failed");
1094 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1095 goto error;
1096 }
1097 }
1098
1099 /* For each channel */
1100 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
1101 if (kchan->stream_count == 0) {
1102 ret = kernel_open_channel_stream(kchan);
1103 if (ret < 0) {
1104 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1105 goto error;
1106 }
1107 /* Update the stream global counter */
1108 ksess->stream_count_global += ret;
1109 }
1110 }
1111
1112 /* Setup kernel consumer socket and send fds to it */
1113 ret = init_kernel_tracing(ksess);
e43c41c5 1114 if (ret != 0) {
9b6c7ec5
DG
1115 ret = LTTNG_ERR_KERN_START_FAIL;
1116 goto error;
1117 }
1118
1119 /* This start the kernel tracing */
1120 ret = kernel_start_session(ksess);
1121 if (ret < 0) {
1122 ret = LTTNG_ERR_KERN_START_FAIL;
1123 goto error;
1124 }
1125
1126 /* Quiescent wait after starting trace */
784303b0 1127 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5 1128
14fb1ebe 1129 ksess->active = 1;
9b6c7ec5
DG
1130
1131 ret = LTTNG_OK;
1132
1133error:
1134 return ret;
1135}
1136
2f77fc4b
DG
1137/*
1138 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1139 */
56a37563
JG
1140int cmd_disable_channel(struct ltt_session *session,
1141 enum lttng_domain_type domain, char *channel_name)
2f77fc4b
DG
1142{
1143 int ret;
1144 struct ltt_ust_session *usess;
1145
1146 usess = session->ust_session;
1147
2223c96f
DG
1148 rcu_read_lock();
1149
2f77fc4b
DG
1150 switch (domain) {
1151 case LTTNG_DOMAIN_KERNEL:
1152 {
1153 ret = channel_kernel_disable(session->kernel_session,
1154 channel_name);
f73fabfd 1155 if (ret != LTTNG_OK) {
2f77fc4b
DG
1156 goto error;
1157 }
1158
1159 kernel_wait_quiescent(kernel_tracer_fd);
1160 break;
1161 }
1162 case LTTNG_DOMAIN_UST:
1163 {
1164 struct ltt_ust_channel *uchan;
1165 struct lttng_ht *chan_ht;
1166
1167 chan_ht = usess->domain_global.channels;
1168
1169 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
1170 if (uchan == NULL) {
f73fabfd 1171 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
1172 goto error;
1173 }
1174
7972aab2 1175 ret = channel_ust_disable(usess, uchan);
f73fabfd 1176 if (ret != LTTNG_OK) {
2f77fc4b
DG
1177 goto error;
1178 }
1179 break;
1180 }
2f77fc4b 1181 default:
f73fabfd 1182 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1183 goto error;
1184 }
1185
f73fabfd 1186 ret = LTTNG_OK;
2f77fc4b
DG
1187
1188error:
2223c96f 1189 rcu_read_unlock();
2f77fc4b
DG
1190 return ret;
1191}
1192
ccf10263
MD
1193/*
1194 * Command LTTNG_TRACK_PID processed by the client thread.
a9ad0c8f
MD
1195 *
1196 * Called with session lock held.
ccf10263 1197 */
56a37563
JG
1198int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain,
1199 int pid)
ccf10263
MD
1200{
1201 int ret;
1202
1203 rcu_read_lock();
1204
1205 switch (domain) {
1206 case LTTNG_DOMAIN_KERNEL:
1207 {
1208 struct ltt_kernel_session *ksess;
1209
1210 ksess = session->kernel_session;
1211
1212 ret = kernel_track_pid(ksess, pid);
1213 if (ret != LTTNG_OK) {
1214 goto error;
1215 }
1216
1217 kernel_wait_quiescent(kernel_tracer_fd);
1218 break;
1219 }
ccf10263 1220 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
1221 {
1222 struct ltt_ust_session *usess;
1223
1224 usess = session->ust_session;
1225
1226 ret = trace_ust_track_pid(usess, pid);
1227 if (ret != LTTNG_OK) {
1228 goto error;
1229 }
1230 break;
1231 }
ccf10263
MD
1232 default:
1233 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1234 goto error;
1235 }
1236
1237 ret = LTTNG_OK;
1238
1239error:
1240 rcu_read_unlock();
1241 return ret;
1242}
1243
1244/*
1245 * Command LTTNG_UNTRACK_PID processed by the client thread.
a9ad0c8f
MD
1246 *
1247 * Called with session lock held.
ccf10263 1248 */
56a37563
JG
1249int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain,
1250 int pid)
ccf10263
MD
1251{
1252 int ret;
1253
1254 rcu_read_lock();
1255
1256 switch (domain) {
1257 case LTTNG_DOMAIN_KERNEL:
1258 {
1259 struct ltt_kernel_session *ksess;
1260
1261 ksess = session->kernel_session;
1262
1263 ret = kernel_untrack_pid(ksess, pid);
1264 if (ret != LTTNG_OK) {
1265 goto error;
1266 }
1267
1268 kernel_wait_quiescent(kernel_tracer_fd);
1269 break;
1270 }
ccf10263 1271 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
1272 {
1273 struct ltt_ust_session *usess;
1274
1275 usess = session->ust_session;
1276
1277 ret = trace_ust_untrack_pid(usess, pid);
1278 if (ret != LTTNG_OK) {
1279 goto error;
1280 }
1281 break;
1282 }
ccf10263
MD
1283 default:
1284 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1285 goto error;
1286 }
1287
1288 ret = LTTNG_OK;
1289
1290error:
1291 rcu_read_unlock();
1292 return ret;
1293}
1294
2f77fc4b
DG
1295/*
1296 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1297 *
1298 * The wpipe arguments is used as a notifier for the kernel thread.
1299 */
1300int cmd_enable_channel(struct ltt_session *session,
7972aab2 1301 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
2f77fc4b
DG
1302{
1303 int ret;
1304 struct ltt_ust_session *usess = session->ust_session;
1305 struct lttng_ht *chan_ht;
1f345e94 1306 size_t len;
2f77fc4b
DG
1307
1308 assert(session);
1309 assert(attr);
7972aab2 1310 assert(domain);
2f77fc4b 1311
f5436bfc 1312 len = lttng_strnlen(attr->name, sizeof(attr->name));
1f345e94
PP
1313
1314 /* Validate channel name */
1315 if (attr->name[0] == '.' ||
1316 memchr(attr->name, '/', len) != NULL) {
1317 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1318 goto end;
1319 }
1320
2f77fc4b
DG
1321 DBG("Enabling channel %s for session %s", attr->name, session->name);
1322
03b4fdcf
DG
1323 rcu_read_lock();
1324
ecc48a90
JD
1325 /*
1326 * Don't try to enable a channel if the session has been started at
1327 * some point in time before. The tracer does not allow it.
1328 */
8382cf6f 1329 if (session->has_been_started) {
ecc48a90
JD
1330 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1331 goto error;
1332 }
1333
1334 /*
1335 * If the session is a live session, remove the switch timer, the
1336 * live timer does the same thing but sends also synchronisation
1337 * beacons for inactive streams.
1338 */
1339 if (session->live_timer > 0) {
1340 attr->attr.live_timer_interval = session->live_timer;
1341 attr->attr.switch_timer_interval = 0;
1342 }
1343
7972aab2 1344 switch (domain->type) {
2f77fc4b
DG
1345 case LTTNG_DOMAIN_KERNEL:
1346 {
1347 struct ltt_kernel_channel *kchan;
1348
2f77fc4b
DG
1349 kchan = trace_kernel_get_channel_by_name(attr->name,
1350 session->kernel_session);
1351 if (kchan == NULL) {
1352 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
85076754
MD
1353 if (attr->name[0] != '\0') {
1354 session->kernel_session->has_non_default_channel = 1;
1355 }
2f77fc4b
DG
1356 } else {
1357 ret = channel_kernel_enable(session->kernel_session, kchan);
1358 }
1359
f73fabfd 1360 if (ret != LTTNG_OK) {
2f77fc4b
DG
1361 goto error;
1362 }
1363
784303b0 1364 kernel_wait_quiescent(kernel_tracer_fd);
2f77fc4b
DG
1365 break;
1366 }
1367 case LTTNG_DOMAIN_UST:
9232818f
JG
1368 case LTTNG_DOMAIN_JUL:
1369 case LTTNG_DOMAIN_LOG4J:
1370 case LTTNG_DOMAIN_PYTHON:
2f77fc4b
DG
1371 {
1372 struct ltt_ust_channel *uchan;
1373
9232818f
JG
1374 /*
1375 * FIXME
1376 *
1377 * Current agent implementation limitations force us to allow
1378 * only one channel at once in "agent" subdomains. Each
1379 * subdomain has a default channel name which must be strictly
1380 * adhered to.
1381 */
1382 if (domain->type == LTTNG_DOMAIN_JUL) {
1383 if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME,
1384 LTTNG_SYMBOL_NAME_LEN)) {
1385 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1386 goto error;
1387 }
1388 } else if (domain->type == LTTNG_DOMAIN_LOG4J) {
1389 if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME,
1390 LTTNG_SYMBOL_NAME_LEN)) {
1391 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1392 goto error;
1393 }
1394 } else if (domain->type == LTTNG_DOMAIN_PYTHON) {
1395 if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME,
1396 LTTNG_SYMBOL_NAME_LEN)) {
1397 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1398 goto error;
1399 }
1400 }
1401
2f77fc4b
DG
1402 chan_ht = usess->domain_global.channels;
1403
1404 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1405 if (uchan == NULL) {
7972aab2 1406 ret = channel_ust_create(usess, attr, domain->buf_type);
85076754
MD
1407 if (attr->name[0] != '\0') {
1408 usess->has_non_default_channel = 1;
1409 }
2f77fc4b 1410 } else {
7972aab2 1411 ret = channel_ust_enable(usess, uchan);
2f77fc4b
DG
1412 }
1413 break;
1414 }
2f77fc4b 1415 default:
f73fabfd 1416 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1417 goto error;
1418 }
1419
1420error:
2223c96f 1421 rcu_read_unlock();
1f345e94 1422end:
2f77fc4b
DG
1423 return ret;
1424}
1425
2f77fc4b
DG
1426/*
1427 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1428 */
56a37563
JG
1429int cmd_disable_event(struct ltt_session *session,
1430 enum lttng_domain_type domain, char *channel_name,
6e911cad 1431 struct lttng_event *event)
2f77fc4b
DG
1432{
1433 int ret;
6e911cad
MD
1434 char *event_name;
1435
18a720cd
MD
1436 DBG("Disable event command for event \'%s\'", event->name);
1437
6e911cad 1438 event_name = event->name;
7076b56e
JG
1439 if (validate_event_name(event_name)) {
1440 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1441 goto error;
1442 }
6e911cad 1443
9b7431cf
JG
1444 /* Error out on unhandled search criteria */
1445 if (event->loglevel_type || event->loglevel != -1 || event->enabled
6e911cad 1446 || event->pid || event->filter || event->exclusion) {
7076b56e
JG
1447 ret = LTTNG_ERR_UNK;
1448 goto error;
6e911cad 1449 }
2f77fc4b 1450
2223c96f
DG
1451 rcu_read_lock();
1452
2f77fc4b
DG
1453 switch (domain) {
1454 case LTTNG_DOMAIN_KERNEL:
1455 {
1456 struct ltt_kernel_channel *kchan;
1457 struct ltt_kernel_session *ksess;
1458
1459 ksess = session->kernel_session;
1460
85076754
MD
1461 /*
1462 * If a non-default channel has been created in the
1463 * session, explicitely require that -c chan_name needs
1464 * to be provided.
1465 */
1466 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1467 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1468 goto error_unlock;
85076754
MD
1469 }
1470
2f77fc4b
DG
1471 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1472 if (kchan == NULL) {
f73fabfd 1473 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
7076b56e 1474 goto error_unlock;
2f77fc4b
DG
1475 }
1476
6e911cad
MD
1477 switch (event->type) {
1478 case LTTNG_EVENT_ALL:
9550ee81 1479 case LTTNG_EVENT_TRACEPOINT:
d0ae4ea8 1480 case LTTNG_EVENT_SYSCALL:
9550ee81
JR
1481 case LTTNG_EVENT_PROBE:
1482 case LTTNG_EVENT_FUNCTION:
1483 case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */
1484 if (event_name[0] == '\0') {
1485 ret = event_kernel_disable_event(kchan,
1486 NULL, event->type);
29c62722 1487 } else {
d0ae4ea8 1488 ret = event_kernel_disable_event(kchan,
9550ee81 1489 event_name, event->type);
29c62722 1490 }
6e911cad 1491 if (ret != LTTNG_OK) {
7076b56e 1492 goto error_unlock;
6e911cad
MD
1493 }
1494 break;
6e911cad
MD
1495 default:
1496 ret = LTTNG_ERR_UNK;
7076b56e 1497 goto error_unlock;
2f77fc4b
DG
1498 }
1499
1500 kernel_wait_quiescent(kernel_tracer_fd);
1501 break;
1502 }
1503 case LTTNG_DOMAIN_UST:
1504 {
1505 struct ltt_ust_channel *uchan;
1506 struct ltt_ust_session *usess;
1507
1508 usess = session->ust_session;
1509
7076b56e
JG
1510 if (validate_ust_event_name(event_name)) {
1511 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1512 goto error_unlock;
1513 }
1514
85076754
MD
1515 /*
1516 * If a non-default channel has been created in the
9550ee81 1517 * session, explicitly require that -c chan_name needs
85076754
MD
1518 * to be provided.
1519 */
1520 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1521 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1522 goto error_unlock;
85076754
MD
1523 }
1524
2f77fc4b
DG
1525 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1526 channel_name);
1527 if (uchan == NULL) {
f73fabfd 1528 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
7076b56e 1529 goto error_unlock;
2f77fc4b
DG
1530 }
1531
6e911cad
MD
1532 switch (event->type) {
1533 case LTTNG_EVENT_ALL:
b3639870
JR
1534 /*
1535 * An empty event name means that everything
1536 * should be disabled.
1537 */
1538 if (event->name[0] == '\0') {
1539 ret = event_ust_disable_all_tracepoints(usess, uchan);
77d536b2
JR
1540 } else {
1541 ret = event_ust_disable_tracepoint(usess, uchan,
1542 event_name);
1543 }
6e911cad 1544 if (ret != LTTNG_OK) {
7076b56e 1545 goto error_unlock;
6e911cad
MD
1546 }
1547 break;
1548 default:
1549 ret = LTTNG_ERR_UNK;
7076b56e 1550 goto error_unlock;
2f77fc4b
DG
1551 }
1552
1553 DBG3("Disable UST event %s in channel %s completed", event_name,
1554 channel_name);
1555 break;
1556 }
5cdb6027 1557 case LTTNG_DOMAIN_LOG4J:
f20baf8e 1558 case LTTNG_DOMAIN_JUL:
0e115563 1559 case LTTNG_DOMAIN_PYTHON:
f20baf8e 1560 {
fefd409b 1561 struct agent *agt;
f20baf8e
DG
1562 struct ltt_ust_session *usess = session->ust_session;
1563
1564 assert(usess);
1565
6e911cad
MD
1566 switch (event->type) {
1567 case LTTNG_EVENT_ALL:
1568 break;
1569 default:
1570 ret = LTTNG_ERR_UNK;
7076b56e 1571 goto error_unlock;
6e911cad
MD
1572 }
1573
5cdb6027 1574 agt = trace_ust_find_agent(usess, domain);
fefd409b
DG
1575 if (!agt) {
1576 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
7076b56e 1577 goto error_unlock;
fefd409b 1578 }
b3639870
JR
1579 /*
1580 * An empty event name means that everything
1581 * should be disabled.
1582 */
1583 if (event->name[0] == '\0') {
18a720cd
MD
1584 ret = event_agent_disable_all(usess, agt);
1585 } else {
1586 ret = event_agent_disable(usess, agt, event_name);
1587 }
f20baf8e 1588 if (ret != LTTNG_OK) {
7076b56e 1589 goto error_unlock;
f20baf8e
DG
1590 }
1591
1592 break;
1593 }
2f77fc4b 1594 default:
f73fabfd 1595 ret = LTTNG_ERR_UND;
7076b56e 1596 goto error_unlock;
2f77fc4b
DG
1597 }
1598
f73fabfd 1599 ret = LTTNG_OK;
2f77fc4b 1600
7076b56e 1601error_unlock:
2223c96f 1602 rcu_read_unlock();
7076b56e 1603error:
2f77fc4b
DG
1604 return ret;
1605}
1606
2f77fc4b
DG
1607/*
1608 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1609 */
56a37563 1610int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain,
601d5acf 1611 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
2f77fc4b 1612{
d5979e4a 1613 int ret, chan_kern_created = 0, chan_ust_created = 0;
bdf64013
JG
1614 char *app_ctx_provider_name = NULL, *app_ctx_name = NULL;
1615
1616 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
1617 app_ctx_provider_name = ctx->u.app_ctx.provider_name;
1618 app_ctx_name = ctx->u.app_ctx.ctx_name;
1619 }
2f77fc4b
DG
1620
1621 switch (domain) {
1622 case LTTNG_DOMAIN_KERNEL:
979e618e
DG
1623 assert(session->kernel_session);
1624
1625 if (session->kernel_session->channel_count == 0) {
1626 /* Create default channel */
1627 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1628 if (ret != LTTNG_OK) {
1629 goto error;
1630 }
d5979e4a 1631 chan_kern_created = 1;
979e618e 1632 }
2f77fc4b 1633 /* Add kernel context to kernel tracer */
601d5acf 1634 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
f73fabfd 1635 if (ret != LTTNG_OK) {
2f77fc4b
DG
1636 goto error;
1637 }
1638 break;
bdf64013
JG
1639 case LTTNG_DOMAIN_JUL:
1640 case LTTNG_DOMAIN_LOG4J:
1641 {
1642 /*
1643 * Validate channel name.
1644 * If no channel name is given and the domain is JUL or LOG4J,
1645 * set it to the appropriate domain-specific channel name. If
1646 * a name is provided but does not match the expexted channel
1647 * name, return an error.
1648 */
1649 if (domain == LTTNG_DOMAIN_JUL && *channel_name &&
1650 strcmp(channel_name,
1651 DEFAULT_JUL_CHANNEL_NAME)) {
1652 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1653 goto error;
1654 } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name &&
1655 strcmp(channel_name,
1656 DEFAULT_LOG4J_CHANNEL_NAME)) {
1657 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1658 goto error;
1659 }
a93b3916 1660 /* break is _not_ missing here. */
bdf64013 1661 }
2f77fc4b
DG
1662 case LTTNG_DOMAIN_UST:
1663 {
1664 struct ltt_ust_session *usess = session->ust_session;
85076754
MD
1665 unsigned int chan_count;
1666
2f77fc4b
DG
1667 assert(usess);
1668
85076754 1669 chan_count = lttng_ht_get_count(usess->domain_global.channels);
979e618e
DG
1670 if (chan_count == 0) {
1671 struct lttng_channel *attr;
1672 /* Create default channel */
0a9c6494 1673 attr = channel_new_default_attr(domain, usess->buffer_type);
979e618e
DG
1674 if (attr == NULL) {
1675 ret = LTTNG_ERR_FATAL;
1676 goto error;
1677 }
1678
7972aab2 1679 ret = channel_ust_create(usess, attr, usess->buffer_type);
979e618e
DG
1680 if (ret != LTTNG_OK) {
1681 free(attr);
1682 goto error;
1683 }
1684 free(attr);
d5979e4a 1685 chan_ust_created = 1;
979e618e
DG
1686 }
1687
601d5acf 1688 ret = context_ust_add(usess, domain, ctx, channel_name);
bdf64013
JG
1689 free(app_ctx_provider_name);
1690 free(app_ctx_name);
1691 app_ctx_name = NULL;
1692 app_ctx_provider_name = NULL;
f73fabfd 1693 if (ret != LTTNG_OK) {
2f77fc4b
DG
1694 goto error;
1695 }
1696 break;
1697 }
2f77fc4b 1698 default:
f73fabfd 1699 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1700 goto error;
1701 }
1702
bdf64013
JG
1703 ret = LTTNG_OK;
1704 goto end;
2f77fc4b
DG
1705
1706error:
d5979e4a
DG
1707 if (chan_kern_created) {
1708 struct ltt_kernel_channel *kchan =
1709 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1710 session->kernel_session);
1711 /* Created previously, this should NOT fail. */
1712 assert(kchan);
1713 kernel_destroy_channel(kchan);
1714 }
1715
1716 if (chan_ust_created) {
1717 struct ltt_ust_channel *uchan =
1718 trace_ust_find_channel_by_name(
1719 session->ust_session->domain_global.channels,
1720 DEFAULT_CHANNEL_NAME);
1721 /* Created previously, this should NOT fail. */
1722 assert(uchan);
1723 /* Remove from the channel list of the session. */
1724 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1725 uchan);
1726 trace_ust_destroy_channel(uchan);
1727 }
bdf64013
JG
1728end:
1729 free(app_ctx_provider_name);
1730 free(app_ctx_name);
2f77fc4b
DG
1731 return ret;
1732}
1733
930a2e99
JG
1734static int validate_event_name(const char *name)
1735{
1736 int ret = 0;
1737 const char *c = name;
1738 const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN;
bf9807db 1739 bool null_terminated = false;
930a2e99
JG
1740
1741 /*
1742 * Make sure that unescaped wildcards are only used as the last
1743 * character of the event name.
1744 */
1745 while (c < event_name_end) {
1746 switch (*c) {
1747 case '\0':
bf9807db 1748 null_terminated = true;
930a2e99
JG
1749 goto end;
1750 case '\\':
1751 c++;
1752 break;
1753 case '*':
1754 if ((c + 1) < event_name_end && *(c + 1)) {
1755 /* Wildcard is not the last character */
1756 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1757 goto end;
1758 }
1759 default:
1760 break;
1761 }
1762 c++;
1763 }
1764end:
bf9807db
JG
1765 if (!ret && !null_terminated) {
1766 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1767 }
930a2e99
JG
1768 return ret;
1769}
1770
dac8e046
JG
1771static inline bool name_starts_with(const char *name, const char *prefix)
1772{
1773 const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
1774
1775 return !strncmp(name, prefix, max_cmp_len);
1776}
1777
1778/* Perform userspace-specific event name validation */
1779static int validate_ust_event_name(const char *name)
1780{
1781 int ret = 0;
1782
1783 if (!name) {
1784 ret = -1;
1785 goto end;
1786 }
1787
1788 /*
1789 * Check name against all internal UST event component namespaces used
1790 * by the agents.
1791 */
1792 if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) ||
1793 name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) ||
1794 name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) {
1795 ret = -1;
1796 }
1797
1798end:
1799 return ret;
1800}
88f06f15 1801
2f77fc4b 1802/*
88f06f15
JG
1803 * Internal version of cmd_enable_event() with a supplemental
1804 * "internal_event" flag which is used to enable internal events which should
1805 * be hidden from clients. Such events are used in the agent implementation to
1806 * enable the events through which all "agent" events are funeled.
2f77fc4b 1807 */
88f06f15
JG
1808static int _cmd_enable_event(struct ltt_session *session,
1809 struct lttng_domain *domain,
025faf73 1810 char *channel_name, struct lttng_event *event,
6b453b5e 1811 char *filter_expression,
db8f1377
JI
1812 struct lttng_filter_bytecode *filter,
1813 struct lttng_event_exclusion *exclusion,
88f06f15 1814 int wpipe, bool internal_event)
2f77fc4b 1815{
e5f5db7f 1816 int ret, channel_created = 0;
cfedea03 1817 struct lttng_channel *attr = NULL;
2f77fc4b
DG
1818
1819 assert(session);
1820 assert(event);
1821 assert(channel_name);
1822
2a385866
JG
1823 /* If we have a filter, we must have its filter expression */
1824 assert(!(!!filter_expression ^ !!filter));
1825
18a720cd
MD
1826 DBG("Enable event command for event \'%s\'", event->name);
1827
f5ac4bd7
MD
1828 rcu_read_lock();
1829
930a2e99
JG
1830 ret = validate_event_name(event->name);
1831 if (ret) {
1832 goto error;
1833 }
1834
7972aab2 1835 switch (domain->type) {
2f77fc4b
DG
1836 case LTTNG_DOMAIN_KERNEL:
1837 {
1838 struct ltt_kernel_channel *kchan;
1839
85076754
MD
1840 /*
1841 * If a non-default channel has been created in the
1842 * session, explicitely require that -c chan_name needs
1843 * to be provided.
1844 */
1845 if (session->kernel_session->has_non_default_channel
1846 && channel_name[0] == '\0') {
1847 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1848 goto error;
1849 }
1850
2f77fc4b
DG
1851 kchan = trace_kernel_get_channel_by_name(channel_name,
1852 session->kernel_session);
1853 if (kchan == NULL) {
0a9c6494
DG
1854 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1855 LTTNG_BUFFER_GLOBAL);
2f77fc4b 1856 if (attr == NULL) {
f73fabfd 1857 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1858 goto error;
1859 }
04c17253
MD
1860 if (lttng_strncpy(attr->name, channel_name,
1861 sizeof(attr->name))) {
1862 ret = LTTNG_ERR_INVALID;
04c17253
MD
1863 goto error;
1864 }
2f77fc4b
DG
1865
1866 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1867 if (ret != LTTNG_OK) {
2f77fc4b
DG
1868 goto error;
1869 }
e5f5db7f 1870 channel_created = 1;
2f77fc4b
DG
1871 }
1872
1873 /* Get the newly created kernel channel pointer */
1874 kchan = trace_kernel_get_channel_by_name(channel_name,
1875 session->kernel_session);
1876 if (kchan == NULL) {
1877 /* This sould not happen... */
f73fabfd 1878 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1879 goto error;
1880 }
1881
6e911cad
MD
1882 switch (event->type) {
1883 case LTTNG_EVENT_ALL:
29c62722 1884 {
00a62084
MD
1885 char *filter_expression_a = NULL;
1886 struct lttng_filter_bytecode *filter_a = NULL;
1887
1888 /*
1889 * We need to duplicate filter_expression and filter,
1890 * because ownership is passed to first enable
1891 * event.
1892 */
1893 if (filter_expression) {
1894 filter_expression_a = strdup(filter_expression);
1895 if (!filter_expression_a) {
1896 ret = LTTNG_ERR_FATAL;
1897 goto error;
1898 }
1899 }
1900 if (filter) {
1901 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
1902 if (!filter_a) {
1903 free(filter_expression_a);
1904 ret = LTTNG_ERR_FATAL;
1905 goto error;
1906 }
1907 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
1908 }
29c62722 1909 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
00a62084
MD
1910 ret = event_kernel_enable_event(kchan, event,
1911 filter_expression, filter);
a969e101
MD
1912 /* We have passed ownership */
1913 filter_expression = NULL;
1914 filter = NULL;
29c62722
MD
1915 if (ret != LTTNG_OK) {
1916 if (channel_created) {
1917 /* Let's not leak a useless channel. */
1918 kernel_destroy_channel(kchan);
1919 }
00a62084
MD
1920 free(filter_expression_a);
1921 free(filter_a);
29c62722
MD
1922 goto error;
1923 }
1924 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
00a62084
MD
1925 ret = event_kernel_enable_event(kchan, event,
1926 filter_expression_a, filter_a);
60d21fa2
AB
1927 /* We have passed ownership */
1928 filter_expression_a = NULL;
1929 filter_a = NULL;
29c62722
MD
1930 if (ret != LTTNG_OK) {
1931 goto error;
1932 }
1933 break;
1934 }
6e6ef3d7
DG
1935 case LTTNG_EVENT_PROBE:
1936 case LTTNG_EVENT_FUNCTION:
1937 case LTTNG_EVENT_FUNCTION_ENTRY:
6e911cad 1938 case LTTNG_EVENT_TRACEPOINT:
00a62084
MD
1939 ret = event_kernel_enable_event(kchan, event,
1940 filter_expression, filter);
a969e101
MD
1941 /* We have passed ownership */
1942 filter_expression = NULL;
1943 filter = NULL;
6e911cad
MD
1944 if (ret != LTTNG_OK) {
1945 if (channel_created) {
1946 /* Let's not leak a useless channel. */
1947 kernel_destroy_channel(kchan);
1948 }
1949 goto error;
e5f5db7f 1950 }
6e911cad
MD
1951 break;
1952 case LTTNG_EVENT_SYSCALL:
00a62084
MD
1953 ret = event_kernel_enable_event(kchan, event,
1954 filter_expression, filter);
a969e101
MD
1955 /* We have passed ownership */
1956 filter_expression = NULL;
1957 filter = NULL;
e2b957af
MD
1958 if (ret != LTTNG_OK) {
1959 goto error;
1960 }
6e911cad
MD
1961 break;
1962 default:
1963 ret = LTTNG_ERR_UNK;
2f77fc4b
DG
1964 goto error;
1965 }
1966
1967 kernel_wait_quiescent(kernel_tracer_fd);
1968 break;
1969 }
1970 case LTTNG_DOMAIN_UST:
1971 {
1972 struct ltt_ust_channel *uchan;
1973 struct ltt_ust_session *usess = session->ust_session;
1974
1975 assert(usess);
1976
85076754
MD
1977 /*
1978 * If a non-default channel has been created in the
1979 * session, explicitely require that -c chan_name needs
1980 * to be provided.
1981 */
1982 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1983 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1984 goto error;
1985 }
1986
2f77fc4b
DG
1987 /* Get channel from global UST domain */
1988 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1989 channel_name);
1990 if (uchan == NULL) {
1991 /* Create default channel */
0a9c6494
DG
1992 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1993 usess->buffer_type);
2f77fc4b 1994 if (attr == NULL) {
f73fabfd 1995 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1996 goto error;
1997 }
04c17253
MD
1998 if (lttng_strncpy(attr->name, channel_name,
1999 sizeof(attr->name))) {
2000 ret = LTTNG_ERR_INVALID;
04c17253
MD
2001 goto error;
2002 }
2f77fc4b
DG
2003
2004 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 2005 if (ret != LTTNG_OK) {
2f77fc4b
DG
2006 goto error;
2007 }
2f77fc4b
DG
2008
2009 /* Get the newly created channel reference back */
2010 uchan = trace_ust_find_channel_by_name(
2011 usess->domain_global.channels, channel_name);
2012 assert(uchan);
2013 }
2014
141feb8c
JG
2015 if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) {
2016 /*
2017 * Don't allow users to add UST events to channels which
2018 * are assigned to a userspace subdomain (JUL, Log4J,
2019 * Python, etc.).
2020 */
2021 ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN;
2022 goto error;
2023 }
2024
dac8e046
JG
2025 if (!internal_event) {
2026 /*
2027 * Ensure the event name is not reserved for internal
2028 * use.
2029 */
2030 ret = validate_ust_event_name(event->name);
2031 if (ret) {
2032 WARN("Userspace event name %s failed validation.",
2033 event->name ?
2034 event->name : "NULL");
2035 ret = LTTNG_ERR_INVALID_EVENT_NAME;
2036 goto error;
2037 }
2038 }
2039
2f77fc4b 2040 /* At this point, the session and channel exist on the tracer */
6b453b5e 2041 ret = event_ust_enable_tracepoint(usess, uchan, event,
88f06f15
JG
2042 filter_expression, filter, exclusion,
2043 internal_event);
49d21f93
MD
2044 /* We have passed ownership */
2045 filter_expression = NULL;
2046 filter = NULL;
2047 exclusion = NULL;
94382e15
JG
2048 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2049 goto already_enabled;
2050 } else if (ret != LTTNG_OK) {
2f77fc4b
DG
2051 goto error;
2052 }
2053 break;
2054 }
5cdb6027 2055 case LTTNG_DOMAIN_LOG4J:
f20baf8e 2056 case LTTNG_DOMAIN_JUL:
0e115563 2057 case LTTNG_DOMAIN_PYTHON:
f20baf8e 2058 {
da6c3a50 2059 const char *default_event_name, *default_chan_name;
fefd409b 2060 struct agent *agt;
f20baf8e
DG
2061 struct lttng_event uevent;
2062 struct lttng_domain tmp_dom;
2063 struct ltt_ust_session *usess = session->ust_session;
2064
2065 assert(usess);
2066
5cdb6027 2067 agt = trace_ust_find_agent(usess, domain->type);
fefd409b 2068 if (!agt) {
5cdb6027 2069 agt = agent_create(domain->type);
fefd409b 2070 if (!agt) {
e5b3c48c 2071 ret = LTTNG_ERR_NOMEM;
fefd409b
DG
2072 goto error;
2073 }
2074 agent_add(agt, usess->agents);
2075 }
2076
022d91ba 2077 /* Create the default tracepoint. */
996de3c7 2078 memset(&uevent, 0, sizeof(uevent));
f20baf8e
DG
2079 uevent.type = LTTNG_EVENT_TRACEPOINT;
2080 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
51755dc8
JG
2081 default_event_name = event_get_default_agent_ust_name(
2082 domain->type);
da6c3a50 2083 if (!default_event_name) {
e5b3c48c 2084 ret = LTTNG_ERR_FATAL;
da6c3a50 2085 goto error;
f43f95a9 2086 }
da6c3a50 2087 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
f20baf8e
DG
2088 uevent.name[sizeof(uevent.name) - 1] = '\0';
2089
2090 /*
2091 * The domain type is changed because we are about to enable the
2092 * default channel and event for the JUL domain that are hardcoded.
2093 * This happens in the UST domain.
2094 */
2095 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
2096 tmp_dom.type = LTTNG_DOMAIN_UST;
2097
0e115563
DG
2098 switch (domain->type) {
2099 case LTTNG_DOMAIN_LOG4J:
da6c3a50 2100 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
0e115563
DG
2101 break;
2102 case LTTNG_DOMAIN_JUL:
da6c3a50 2103 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
0e115563
DG
2104 break;
2105 case LTTNG_DOMAIN_PYTHON:
2106 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
2107 break;
2108 default:
e98a44b0 2109 /* The switch/case we are in makes this impossible */
0e115563 2110 assert(0);
da6c3a50
DG
2111 }
2112
971da06a 2113 {
8404118c 2114 char *filter_expression_copy = NULL;
51755dc8 2115 struct lttng_filter_bytecode *filter_copy = NULL;
971da06a
JG
2116
2117 if (filter) {
51755dc8
JG
2118 const size_t filter_size = sizeof(
2119 struct lttng_filter_bytecode)
2120 + filter->len;
2121
2122 filter_copy = zmalloc(filter_size);
971da06a 2123 if (!filter_copy) {
018096a4 2124 ret = LTTNG_ERR_NOMEM;
b742e3e2 2125 goto error;
971da06a 2126 }
51755dc8 2127 memcpy(filter_copy, filter, filter_size);
971da06a 2128
8404118c
JG
2129 filter_expression_copy =
2130 strdup(filter_expression);
2131 if (!filter_expression) {
2132 ret = LTTNG_ERR_NOMEM;
51755dc8
JG
2133 }
2134
2135 if (!filter_expression_copy || !filter_copy) {
2136 free(filter_expression_copy);
2137 free(filter_copy);
2138 goto error;
8404118c 2139 }
971da06a
JG
2140 }
2141
88f06f15 2142 ret = cmd_enable_event_internal(session, &tmp_dom,
971da06a 2143 (char *) default_chan_name,
8404118c
JG
2144 &uevent, filter_expression_copy,
2145 filter_copy, NULL, wpipe);
971da06a
JG
2146 }
2147
94382e15
JG
2148 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2149 goto already_enabled;
2150 } else if (ret != LTTNG_OK) {
f20baf8e
DG
2151 goto error;
2152 }
2153
2154 /* The wild card * means that everything should be enabled. */
2155 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
8404118c
JG
2156 ret = event_agent_enable_all(usess, agt, event, filter,
2157 filter_expression);
f20baf8e 2158 } else {
8404118c
JG
2159 ret = event_agent_enable(usess, agt, event, filter,
2160 filter_expression);
f20baf8e 2161 }
51755dc8
JG
2162 filter = NULL;
2163 filter_expression = NULL;
f20baf8e
DG
2164 if (ret != LTTNG_OK) {
2165 goto error;
2166 }
2167
2168 break;
2169 }
2f77fc4b 2170 default:
f73fabfd 2171 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2172 goto error;
2173 }
2174
f73fabfd 2175 ret = LTTNG_OK;
2f77fc4b 2176
94382e15 2177already_enabled:
2f77fc4b 2178error:
49d21f93
MD
2179 free(filter_expression);
2180 free(filter);
2181 free(exclusion);
cfedea03 2182 free(attr);
2223c96f 2183 rcu_read_unlock();
2f77fc4b
DG
2184 return ret;
2185}
2186
88f06f15
JG
2187/*
2188 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2189 * We own filter, exclusion, and filter_expression.
2190 */
2191int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
2192 char *channel_name, struct lttng_event *event,
2193 char *filter_expression,
2194 struct lttng_filter_bytecode *filter,
2195 struct lttng_event_exclusion *exclusion,
2196 int wpipe)
2197{
2198 return _cmd_enable_event(session, domain, channel_name, event,
2199 filter_expression, filter, exclusion, wpipe, false);
2200}
2201
2202/*
2203 * Enable an event which is internal to LTTng. An internal should
2204 * never be made visible to clients and are immune to checks such as
2205 * reserved names.
2206 */
2207static int cmd_enable_event_internal(struct ltt_session *session,
2208 struct lttng_domain *domain,
2209 char *channel_name, struct lttng_event *event,
2210 char *filter_expression,
2211 struct lttng_filter_bytecode *filter,
2212 struct lttng_event_exclusion *exclusion,
2213 int wpipe)
2214{
2215 return _cmd_enable_event(session, domain, channel_name, event,
2216 filter_expression, filter, exclusion, wpipe, true);
2217}
2218
2f77fc4b
DG
2219/*
2220 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2221 */
56a37563
JG
2222ssize_t cmd_list_tracepoints(enum lttng_domain_type domain,
2223 struct lttng_event **events)
2f77fc4b
DG
2224{
2225 int ret;
2226 ssize_t nb_events = 0;
2227
2228 switch (domain) {
2229 case LTTNG_DOMAIN_KERNEL:
2230 nb_events = kernel_list_events(kernel_tracer_fd, events);
2231 if (nb_events < 0) {
f73fabfd 2232 ret = LTTNG_ERR_KERN_LIST_FAIL;
2f77fc4b
DG
2233 goto error;
2234 }
2235 break;
2236 case LTTNG_DOMAIN_UST:
2237 nb_events = ust_app_list_events(events);
2238 if (nb_events < 0) {
f73fabfd 2239 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
2240 goto error;
2241 }
2242 break;
5cdb6027 2243 case LTTNG_DOMAIN_LOG4J:
3c6a091f 2244 case LTTNG_DOMAIN_JUL:
0e115563 2245 case LTTNG_DOMAIN_PYTHON:
f60140a1 2246 nb_events = agent_list_events(events, domain);
3c6a091f
DG
2247 if (nb_events < 0) {
2248 ret = LTTNG_ERR_UST_LIST_FAIL;
2249 goto error;
2250 }
2251 break;
2f77fc4b 2252 default:
f73fabfd 2253 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2254 goto error;
2255 }
2256
2257 return nb_events;
2258
2259error:
2260 /* Return negative value to differentiate return code */
2261 return -ret;
2262}
2263
2264/*
2265 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2266 */
56a37563 2267ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain,
2f77fc4b
DG
2268 struct lttng_event_field **fields)
2269{
2270 int ret;
2271 ssize_t nb_fields = 0;
2272
2273 switch (domain) {
2274 case LTTNG_DOMAIN_UST:
2275 nb_fields = ust_app_list_event_fields(fields);
2276 if (nb_fields < 0) {
f73fabfd 2277 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
2278 goto error;
2279 }
2280 break;
2281 case LTTNG_DOMAIN_KERNEL:
2282 default: /* fall-through */
f73fabfd 2283 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2284 goto error;
2285 }
2286
2287 return nb_fields;
2288
2289error:
2290 /* Return negative value to differentiate return code */
2291 return -ret;
2292}
2293
834978fd
DG
2294ssize_t cmd_list_syscalls(struct lttng_event **events)
2295{
2296 return syscall_table_list(events);
2297}
2298
a5dfbb9d
MD
2299/*
2300 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2301 *
2302 * Called with session lock held.
2303 */
2304ssize_t cmd_list_tracker_pids(struct ltt_session *session,
56a37563 2305 enum lttng_domain_type domain, int32_t **pids)
a5dfbb9d
MD
2306{
2307 int ret;
2308 ssize_t nr_pids = 0;
2309
2310 switch (domain) {
2311 case LTTNG_DOMAIN_KERNEL:
2312 {
2313 struct ltt_kernel_session *ksess;
2314
2315 ksess = session->kernel_session;
2316 nr_pids = kernel_list_tracker_pids(ksess, pids);
2317 if (nr_pids < 0) {
2318 ret = LTTNG_ERR_KERN_LIST_FAIL;
2319 goto error;
2320 }
2321 break;
2322 }
2323 case LTTNG_DOMAIN_UST:
2324 {
2325 struct ltt_ust_session *usess;
2326
2327 usess = session->ust_session;
2328 nr_pids = trace_ust_list_tracker_pids(usess, pids);
2329 if (nr_pids < 0) {
2330 ret = LTTNG_ERR_UST_LIST_FAIL;
2331 goto error;
2332 }
2333 break;
2334 }
2335 case LTTNG_DOMAIN_LOG4J:
2336 case LTTNG_DOMAIN_JUL:
2337 case LTTNG_DOMAIN_PYTHON:
2338 default:
2339 ret = LTTNG_ERR_UND;
2340 goto error;
2341 }
2342
2343 return nr_pids;
2344
2345error:
2346 /* Return negative value to differentiate return code */
2347 return -ret;
2348}
2349
2f77fc4b
DG
2350/*
2351 * Command LTTNG_START_TRACE processed by the client thread.
a9ad0c8f
MD
2352 *
2353 * Called with session mutex held.
2f77fc4b
DG
2354 */
2355int cmd_start_trace(struct ltt_session *session)
2356{
2357 int ret;
cde3e505 2358 unsigned long nb_chan = 0;
2f77fc4b
DG
2359 struct ltt_kernel_session *ksession;
2360 struct ltt_ust_session *usess;
2f77fc4b
DG
2361
2362 assert(session);
2363
2364 /* Ease our life a bit ;) */
2365 ksession = session->kernel_session;
2366 usess = session->ust_session;
2367
8382cf6f
DG
2368 /* Is the session already started? */
2369 if (session->active) {
f73fabfd 2370 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2371 goto error;
2372 }
2373
cde3e505
DG
2374 /*
2375 * Starting a session without channel is useless since after that it's not
2376 * possible to enable channel thus inform the client.
2377 */
2378 if (usess && usess->domain_global.channels) {
2379 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
2380 }
2381 if (ksession) {
2382 nb_chan += ksession->channel_count;
2383 }
2384 if (!nb_chan) {
2385 ret = LTTNG_ERR_NO_CHANNEL;
2386 goto error;
2387 }
2388
2f77fc4b
DG
2389 /* Kernel tracing */
2390 if (ksession != NULL) {
9b6c7ec5
DG
2391 ret = start_kernel_session(ksession, kernel_tracer_fd);
2392 if (ret != LTTNG_OK) {
2f77fc4b
DG
2393 goto error;
2394 }
2f77fc4b
DG
2395 }
2396
2397 /* Flag session that trace should start automatically */
2398 if (usess) {
14fb1ebe
DG
2399 /*
2400 * Even though the start trace might fail, flag this session active so
2401 * other application coming in are started by default.
2402 */
2403 usess->active = 1;
2f77fc4b
DG
2404
2405 ret = ust_app_start_trace_all(usess);
2406 if (ret < 0) {
f73fabfd 2407 ret = LTTNG_ERR_UST_START_FAIL;
2f77fc4b
DG
2408 goto error;
2409 }
2410 }
2411
8382cf6f
DG
2412 /* Flag this after a successful start. */
2413 session->has_been_started = 1;
2414 session->active = 1;
9b6c7ec5 2415
f73fabfd 2416 ret = LTTNG_OK;
2f77fc4b
DG
2417
2418error:
2419 return ret;
2420}
2421
2422/*
2423 * Command LTTNG_STOP_TRACE processed by the client thread.
2424 */
2425int cmd_stop_trace(struct ltt_session *session)
2426{
2427 int ret;
2428 struct ltt_kernel_channel *kchan;
2429 struct ltt_kernel_session *ksession;
2430 struct ltt_ust_session *usess;
2431
2432 assert(session);
2433
2434 /* Short cut */
2435 ksession = session->kernel_session;
2436 usess = session->ust_session;
2437
8382cf6f
DG
2438 /* Session is not active. Skip everythong and inform the client. */
2439 if (!session->active) {
f73fabfd 2440 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2f77fc4b
DG
2441 goto error;
2442 }
2443
2f77fc4b 2444 /* Kernel tracer */
14fb1ebe 2445 if (ksession && ksession->active) {
2f77fc4b
DG
2446 DBG("Stop kernel tracing");
2447
566d8970
MD
2448 ret = kernel_stop_session(ksession);
2449 if (ret < 0) {
2450 ret = LTTNG_ERR_KERN_STOP_FAIL;
2451 goto error;
2452 }
2453
2454 kernel_wait_quiescent(kernel_tracer_fd);
2455
2456 /* Flush metadata after stopping (if exists) */
2f77fc4b
DG
2457 if (ksession->metadata_stream_fd >= 0) {
2458 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2459 if (ret < 0) {
2460 ERR("Kernel metadata flush failed");
2461 }
2462 }
2463
566d8970 2464 /* Flush all buffers after stopping */
2f77fc4b
DG
2465 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2466 ret = kernel_flush_buffer(kchan);
2467 if (ret < 0) {
2468 ERR("Kernel flush buffer error");
2469 }
2470 }
2471
14fb1ebe 2472 ksession->active = 0;
2f77fc4b
DG
2473 }
2474
14fb1ebe
DG
2475 if (usess && usess->active) {
2476 /*
2477 * Even though the stop trace might fail, flag this session inactive so
2478 * other application coming in are not started by default.
2479 */
2480 usess->active = 0;
2f77fc4b
DG
2481
2482 ret = ust_app_stop_trace_all(usess);
2483 if (ret < 0) {
f73fabfd 2484 ret = LTTNG_ERR_UST_STOP_FAIL;
2f77fc4b
DG
2485 goto error;
2486 }
2487 }
2488
8382cf6f
DG
2489 /* Flag inactive after a successful stop. */
2490 session->active = 0;
f73fabfd 2491 ret = LTTNG_OK;
2f77fc4b
DG
2492
2493error:
2494 return ret;
2495}
2496
2497/*
2498 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2499 */
bda32d56
JG
2500int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2501 struct lttng_uri *uris)
2f77fc4b
DG
2502{
2503 int ret, i;
2504 struct ltt_kernel_session *ksess = session->kernel_session;
2505 struct ltt_ust_session *usess = session->ust_session;
2f77fc4b
DG
2506
2507 assert(session);
2508 assert(uris);
2509 assert(nb_uri > 0);
2510
8382cf6f
DG
2511 /* Can't set consumer URI if the session is active. */
2512 if (session->active) {
f73fabfd 2513 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2514 goto error;
2515 }
2516
bda32d56 2517 /* Set the "global" consumer URIs */
2f77fc4b 2518 for (i = 0; i < nb_uri; i++) {
bda32d56
JG
2519 ret = add_uri_to_consumer(session->consumer,
2520 &uris[i], 0, session->name);
a74934ba 2521 if (ret != LTTNG_OK) {
2f77fc4b
DG
2522 goto error;
2523 }
2f77fc4b
DG
2524 }
2525
bda32d56
JG
2526 /* Set UST session URIs */
2527 if (session->ust_session) {
2528 for (i = 0; i < nb_uri; i++) {
2529 ret = add_uri_to_consumer(
2530 session->ust_session->consumer,
2531 &uris[i], LTTNG_DOMAIN_UST,
2532 session->name);
2533 if (ret != LTTNG_OK) {
2534 goto error;
2535 }
2536 }
2537 }
2538
2539 /* Set kernel session URIs */
2540 if (session->kernel_session) {
2541 for (i = 0; i < nb_uri; i++) {
2542 ret = add_uri_to_consumer(
2543 session->kernel_session->consumer,
2544 &uris[i], LTTNG_DOMAIN_KERNEL,
2545 session->name);
2546 if (ret != LTTNG_OK) {
2547 goto error;
2548 }
2549 }
2550 }
2551
7ab70fe0
DG
2552 /*
2553 * Make sure to set the session in output mode after we set URI since a
2554 * session can be created without URL (thus flagged in no output mode).
2555 */
2556 session->output_traces = 1;
2557 if (ksess) {
2558 ksess->output_traces = 1;
bda32d56
JG
2559 }
2560
2561 if (usess) {
7ab70fe0
DG
2562 usess->output_traces = 1;
2563 }
2564
2f77fc4b 2565 /* All good! */
f73fabfd 2566 ret = LTTNG_OK;
2f77fc4b
DG
2567
2568error:
2569 return ret;
2570}
2571
2572/*
2573 * Command LTTNG_CREATE_SESSION processed by the client thread.
2574 */
2575int cmd_create_session_uri(char *name, struct lttng_uri *uris,
ecc48a90 2576 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2f77fc4b
DG
2577{
2578 int ret;
2f77fc4b
DG
2579 struct ltt_session *session;
2580
2581 assert(name);
2bba9e53 2582 assert(creds);
785d2d0d 2583
2f77fc4b
DG
2584 /*
2585 * Verify if the session already exist
2586 *
2587 * XXX: There is no need for the session lock list here since the caller
2588 * (process_client_msg) is holding it. We might want to change that so a
2589 * single command does not lock the entire session list.
2590 */
2591 session = session_find_by_name(name);
2592 if (session != NULL) {
f73fabfd 2593 ret = LTTNG_ERR_EXIST_SESS;
2f77fc4b
DG
2594 goto find_error;
2595 }
2596
2597 /* Create tracing session in the registry */
dec56f6c 2598 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2f77fc4b 2599 LTTNG_SOCK_GET_GID_CRED(creds));
f73fabfd 2600 if (ret != LTTNG_OK) {
2f77fc4b
DG
2601 goto session_error;
2602 }
2603
2604 /*
2605 * Get the newly created session pointer back
2606 *
2607 * XXX: There is no need for the session lock list here since the caller
2608 * (process_client_msg) is holding it. We might want to change that so a
2609 * single command does not lock the entire session list.
2610 */
2611 session = session_find_by_name(name);
2612 assert(session);
2613
ecc48a90 2614 session->live_timer = live_timer;
2f77fc4b
DG
2615 /* Create default consumer output for the session not yet created. */
2616 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2617 if (session->consumer == NULL) {
f73fabfd 2618 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2619 goto consumer_error;
2620 }
2621
2bba9e53 2622 if (uris) {
bda32d56 2623 ret = cmd_set_consumer_uri(session, nb_uri, uris);
2bba9e53
DG
2624 if (ret != LTTNG_OK) {
2625 goto consumer_error;
2626 }
2627 session->output_traces = 1;
2628 } else {
2629 session->output_traces = 0;
2630 DBG2("Session %s created with no output", session->name);
2f77fc4b
DG
2631 }
2632
2633 session->consumer->enabled = 1;
2634
f73fabfd 2635 return LTTNG_OK;
2f77fc4b
DG
2636
2637consumer_error:
2638 session_destroy(session);
2639session_error:
2640find_error:
2641 return ret;
2642}
2643
27babd3a
DG
2644/*
2645 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2646 */
2647int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2648 size_t nb_uri, lttng_sock_cred *creds)
2649{
2650 int ret;
2651 struct ltt_session *session;
2652 struct snapshot_output *new_output = NULL;
2653
2654 assert(name);
2655 assert(creds);
2656
2657 /*
2658 * Create session in no output mode with URIs set to NULL. The uris we've
2659 * received are for a default snapshot output if one.
2660 */
ae58b817 2661 ret = cmd_create_session_uri(name, NULL, 0, creds, 0);
27babd3a
DG
2662 if (ret != LTTNG_OK) {
2663 goto error;
2664 }
2665
2666 /* Get the newly created session pointer back. This should NEVER fail. */
2667 session = session_find_by_name(name);
2668 assert(session);
2669
2670 /* Flag session for snapshot mode. */
2671 session->snapshot_mode = 1;
2672
2673 /* Skip snapshot output creation if no URI is given. */
2674 if (nb_uri == 0) {
2675 goto end;
2676 }
2677
2678 new_output = snapshot_output_alloc();
2679 if (!new_output) {
2680 ret = LTTNG_ERR_NOMEM;
2681 goto error_snapshot_alloc;
2682 }
2683
2684 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2685 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2686 if (ret < 0) {
2687 if (ret == -ENOMEM) {
2688 ret = LTTNG_ERR_NOMEM;
2689 } else {
2690 ret = LTTNG_ERR_INVALID;
2691 }
2692 goto error_snapshot;
2693 }
2694
2695 rcu_read_lock();
2696 snapshot_add_output(&session->snapshot, new_output);
2697 rcu_read_unlock();
2698
2699end:
2700 return LTTNG_OK;
2701
2702error_snapshot:
2703 snapshot_output_destroy(new_output);
2704error_snapshot_alloc:
2705 session_destroy(session);
2706error:
2707 return ret;
2708}
2709
2f77fc4b
DG
2710/*
2711 * Command LTTNG_DESTROY_SESSION processed by the client thread.
a9ad0c8f
MD
2712 *
2713 * Called with session lock held.
2f77fc4b
DG
2714 */
2715int cmd_destroy_session(struct ltt_session *session, int wpipe)
2716{
2717 int ret;
2718 struct ltt_ust_session *usess;
2719 struct ltt_kernel_session *ksess;
2720
2721 /* Safety net */
2722 assert(session);
2723
2724 usess = session->ust_session;
2725 ksess = session->kernel_session;
2726
2727 /* Clean kernel session teardown */
2728 kernel_destroy_session(ksess);
2729
2730 /* UST session teardown */
2731 if (usess) {
2732 /* Close any relayd session */
2733 consumer_output_send_destroy_relayd(usess->consumer);
2734
2735 /* Destroy every UST application related to this session. */
2736 ret = ust_app_destroy_trace_all(usess);
2737 if (ret) {
2738 ERR("Error in ust_app_destroy_trace_all");
2739 }
2740
2741 /* Clean up the rest. */
2742 trace_ust_destroy_session(usess);
2743 }
2744
2745 /*
2746 * Must notify the kernel thread here to update it's poll set in order to
2747 * remove the channel(s)' fd just destroyed.
2748 */
2749 ret = notify_thread_pipe(wpipe);
2750 if (ret < 0) {
2751 PERROR("write kernel poll pipe");
2752 }
2753
2754 ret = session_destroy(session);
2755
2756 return ret;
2757}
2758
2f77fc4b
DG
2759/*
2760 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2761 */
56a37563
JG
2762int cmd_register_consumer(struct ltt_session *session,
2763 enum lttng_domain_type domain, const char *sock_path,
2764 struct consumer_data *cdata)
2f77fc4b
DG
2765{
2766 int ret, sock;
dd81b457 2767 struct consumer_socket *socket = NULL;
2f77fc4b
DG
2768
2769 assert(session);
2770 assert(cdata);
2771 assert(sock_path);
2772
2773 switch (domain) {
2774 case LTTNG_DOMAIN_KERNEL:
2775 {
2776 struct ltt_kernel_session *ksess = session->kernel_session;
2777
2778 assert(ksess);
2779
2780 /* Can't register a consumer if there is already one */
2781 if (ksess->consumer_fds_sent != 0) {
f73fabfd 2782 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
2783 goto error;
2784 }
2785
2786 sock = lttcomm_connect_unix_sock(sock_path);
2787 if (sock < 0) {
f73fabfd 2788 ret = LTTNG_ERR_CONNECT_FAIL;
2f77fc4b
DG
2789 goto error;
2790 }
4ce514c4 2791 cdata->cmd_sock = sock;
2f77fc4b 2792
4ce514c4 2793 socket = consumer_allocate_socket(&cdata->cmd_sock);
2f77fc4b 2794 if (socket == NULL) {
f66c074c
DG
2795 ret = close(sock);
2796 if (ret < 0) {
2797 PERROR("close register consumer");
2798 }
4ce514c4 2799 cdata->cmd_sock = -1;
f73fabfd 2800 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2801 goto error;
2802 }
2803
2804 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2805 if (socket->lock == NULL) {
2806 PERROR("zmalloc pthread mutex");
f73fabfd 2807 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2808 goto error;
2809 }
2810 pthread_mutex_init(socket->lock, NULL);
2811 socket->registered = 1;
2812
2813 rcu_read_lock();
2814 consumer_add_socket(socket, ksess->consumer);
2815 rcu_read_unlock();
2816
2817 pthread_mutex_lock(&cdata->pid_mutex);
2818 cdata->pid = -1;
2819 pthread_mutex_unlock(&cdata->pid_mutex);
2820
2821 break;
2822 }
2823 default:
2824 /* TODO: Userspace tracing */
f73fabfd 2825 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2826 goto error;
2827 }
2828
dd81b457 2829 return LTTNG_OK;
2f77fc4b
DG
2830
2831error:
dd81b457
DG
2832 if (socket) {
2833 consumer_destroy_socket(socket);
2834 }
2f77fc4b
DG
2835 return ret;
2836}
2837
2838/*
2839 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2840 */
2841ssize_t cmd_list_domains(struct ltt_session *session,
2842 struct lttng_domain **domains)
2843{
2844 int ret, index = 0;
2845 ssize_t nb_dom = 0;
fefd409b
DG
2846 struct agent *agt;
2847 struct lttng_ht_iter iter;
2f77fc4b
DG
2848
2849 if (session->kernel_session != NULL) {
2850 DBG3("Listing domains found kernel domain");
2851 nb_dom++;
2852 }
2853
2854 if (session->ust_session != NULL) {
2855 DBG3("Listing domains found UST global domain");
2856 nb_dom++;
3c6a091f 2857
e0a74f01 2858 rcu_read_lock();
fefd409b
DG
2859 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2860 agt, node.node) {
2861 if (agt->being_used) {
2862 nb_dom++;
2863 }
3c6a091f 2864 }
e0a74f01 2865 rcu_read_unlock();
2f77fc4b
DG
2866 }
2867
fa64dfb4
JG
2868 if (!nb_dom) {
2869 goto end;
2870 }
2871
2f77fc4b
DG
2872 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2873 if (*domains == NULL) {
f73fabfd 2874 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2875 goto error;
2876 }
2877
2878 if (session->kernel_session != NULL) {
2879 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
b5edb9e8
PP
2880
2881 /* Kernel session buffer type is always GLOBAL */
2882 (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL;
2883
2f77fc4b
DG
2884 index++;
2885 }
2886
2887 if (session->ust_session != NULL) {
2888 (*domains)[index].type = LTTNG_DOMAIN_UST;
88c5f0d8 2889 (*domains)[index].buf_type = session->ust_session->buffer_type;
2f77fc4b 2890 index++;
3c6a091f 2891
e0a74f01 2892 rcu_read_lock();
fefd409b
DG
2893 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2894 agt, node.node) {
2895 if (agt->being_used) {
2896 (*domains)[index].type = agt->domain;
2897 (*domains)[index].buf_type = session->ust_session->buffer_type;
2898 index++;
2899 }
3c6a091f 2900 }
e0a74f01 2901 rcu_read_unlock();
2f77fc4b 2902 }
fa64dfb4 2903end:
2f77fc4b
DG
2904 return nb_dom;
2905
2906error:
f73fabfd
DG
2907 /* Return negative value to differentiate return code */
2908 return -ret;
2f77fc4b
DG
2909}
2910
2911
2912/*
2913 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2914 */
56a37563
JG
2915ssize_t cmd_list_channels(enum lttng_domain_type domain,
2916 struct ltt_session *session, struct lttng_channel **channels)
2f77fc4b 2917{
53e367f9 2918 ssize_t nb_chan = 0, payload_size = 0, ret;
2f77fc4b
DG
2919
2920 switch (domain) {
2921 case LTTNG_DOMAIN_KERNEL:
2922 if (session->kernel_session != NULL) {
2923 nb_chan = session->kernel_session->channel_count;
2924 }
2925 DBG3("Number of kernel channels %zd", nb_chan);
c7d620a2 2926 if (nb_chan <= 0) {
53e367f9
JG
2927 ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2928 goto end;
c7d620a2 2929 }
2f77fc4b
DG
2930 break;
2931 case LTTNG_DOMAIN_UST:
2932 if (session->ust_session != NULL) {
7ffc31a2 2933 rcu_read_lock();
2f77fc4b 2934 nb_chan = lttng_ht_get_count(
7ffc31a2
JG
2935 session->ust_session->domain_global.channels);
2936 rcu_read_unlock();
2f77fc4b
DG
2937 }
2938 DBG3("Number of UST global channels %zd", nb_chan);
ade7ce52 2939 if (nb_chan < 0) {
53e367f9
JG
2940 ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND;
2941 goto end;
c7d620a2 2942 }
2f77fc4b
DG
2943 break;
2944 default:
53e367f9
JG
2945 ret = -LTTNG_ERR_UND;
2946 goto end;
2f77fc4b
DG
2947 }
2948
2949 if (nb_chan > 0) {
53e367f9
JG
2950 const size_t channel_size = sizeof(struct lttng_channel) +
2951 sizeof(struct lttcomm_channel_extended);
2952 struct lttcomm_channel_extended *channel_exts;
2953
2954 payload_size = nb_chan * channel_size;
2955 *channels = zmalloc(payload_size);
2f77fc4b 2956 if (*channels == NULL) {
53e367f9
JG
2957 ret = -LTTNG_ERR_FATAL;
2958 goto end;
2f77fc4b
DG
2959 }
2960
53e367f9
JG
2961 channel_exts = ((void *) *channels) +
2962 (nb_chan * sizeof(struct lttng_channel));
2963 list_lttng_channels(domain, session, *channels, channel_exts);
2964 } else {
2965 *channels = NULL;
2f77fc4b
DG
2966 }
2967
53e367f9
JG
2968 ret = payload_size;
2969end:
2970 return ret;
2f77fc4b
DG
2971}
2972
2973/*
2974 * Command LTTNG_LIST_EVENTS processed by the client thread.
2975 */
56a37563
JG
2976ssize_t cmd_list_events(enum lttng_domain_type domain,
2977 struct ltt_session *session, char *channel_name,
b4e3ceb9 2978 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
2979{
2980 int ret = 0;
2981 ssize_t nb_event = 0;
2982
2983 switch (domain) {
2984 case LTTNG_DOMAIN_KERNEL:
2985 if (session->kernel_session != NULL) {
2986 nb_event = list_lttng_kernel_events(channel_name,
b4e3ceb9
PP
2987 session->kernel_session, events,
2988 total_size);
2f77fc4b
DG
2989 }
2990 break;
2991 case LTTNG_DOMAIN_UST:
2992 {
2993 if (session->ust_session != NULL) {
2994 nb_event = list_lttng_ust_global_events(channel_name,
b4e3ceb9
PP
2995 &session->ust_session->domain_global, events,
2996 total_size);
2f77fc4b
DG
2997 }
2998 break;
2999 }
5cdb6027 3000 case LTTNG_DOMAIN_LOG4J:
3c6a091f 3001 case LTTNG_DOMAIN_JUL:
0e115563 3002 case LTTNG_DOMAIN_PYTHON:
3c6a091f 3003 if (session->ust_session) {
fefd409b
DG
3004 struct lttng_ht_iter iter;
3005 struct agent *agt;
3006
b11feea5 3007 rcu_read_lock();
fefd409b
DG
3008 cds_lfht_for_each_entry(session->ust_session->agents->ht,
3009 &iter.iter, agt, node.node) {
1dfd9906
JG
3010 if (agt->domain == domain) {
3011 nb_event = list_lttng_agent_events(
b4e3ceb9
PP
3012 agt, events,
3013 total_size);
1dfd9906
JG
3014 break;
3015 }
fefd409b 3016 }
b11feea5 3017 rcu_read_unlock();
3c6a091f
DG
3018 }
3019 break;
2f77fc4b 3020 default:
f73fabfd 3021 ret = LTTNG_ERR_UND;
2f77fc4b
DG
3022 goto error;
3023 }
3024
f73fabfd 3025 return nb_event;
2f77fc4b
DG
3026
3027error:
f73fabfd
DG
3028 /* Return negative value to differentiate return code */
3029 return -ret;
2f77fc4b
DG
3030}
3031
3032/*
3033 * Using the session list, filled a lttng_session array to send back to the
3034 * client for session listing.
3035 *
3036 * The session list lock MUST be acquired before calling this function. Use
3037 * session_lock_list() and session_unlock_list().
3038 */
3039void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
3040 gid_t gid)
3041{
3042 int ret;
3043 unsigned int i = 0;
3044 struct ltt_session *session;
3045 struct ltt_session_list *list = session_get_list();
3046
3047 DBG("Getting all available session for UID %d GID %d",
3048 uid, gid);
3049 /*
3050 * Iterate over session list and append data after the control struct in
3051 * the buffer.
3052 */
3053 cds_list_for_each_entry(session, &list->head, list) {
3054 /*
3055 * Only list the sessions the user can control.
3056 */
3057 if (!session_access_ok(session, uid, gid)) {
3058 continue;
3059 }
3060
3061 struct ltt_kernel_session *ksess = session->kernel_session;
3062 struct ltt_ust_session *usess = session->ust_session;
3063
3064 if (session->consumer->type == CONSUMER_DST_NET ||
3065 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
3066 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
3067 ret = build_network_session_path(sessions[i].path,
dec56f6c 3068 sizeof(sessions[i].path), session);
2f77fc4b 3069 } else {
dec56f6c 3070 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2f77fc4b
DG
3071 session->consumer->dst.trace_path);
3072 }
3073 if (ret < 0) {
3074 PERROR("snprintf session path");
3075 continue;
3076 }
3077
3078 strncpy(sessions[i].name, session->name, NAME_MAX);
3079 sessions[i].name[NAME_MAX - 1] = '\0';
8382cf6f 3080 sessions[i].enabled = session->active;
2cbf8fed 3081 sessions[i].snapshot_mode = session->snapshot_mode;
8960e9cd 3082 sessions[i].live_timer_interval = session->live_timer;
2f77fc4b
DG
3083 i++;
3084 }
3085}
3086
806e2684 3087/*
6d805429 3088 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
d3f14b8a 3089 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
806e2684 3090 */
6d805429 3091int cmd_data_pending(struct ltt_session *session)
806e2684
DG
3092{
3093 int ret;
3094 struct ltt_kernel_session *ksess = session->kernel_session;
3095 struct ltt_ust_session *usess = session->ust_session;
3096
3097 assert(session);
3098
3099 /* Session MUST be stopped to ask for data availability. */
8382cf6f 3100 if (session->active) {
806e2684
DG
3101 ret = LTTNG_ERR_SESSION_STARTED;
3102 goto error;
3a89d11a
DG
3103 } else {
3104 /*
3105 * If stopped, just make sure we've started before else the above call
3106 * will always send that there is data pending.
3107 *
3108 * The consumer assumes that when the data pending command is received,
3109 * the trace has been started before or else no output data is written
3110 * by the streams which is a condition for data pending. So, this is
3111 * *VERY* important that we don't ask the consumer before a start
3112 * trace.
3113 */
8382cf6f 3114 if (!session->has_been_started) {
3a89d11a
DG
3115 ret = 0;
3116 goto error;
3117 }
806e2684
DG
3118 }
3119
3120 if (ksess && ksess->consumer) {
6d805429
DG
3121 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
3122 if (ret == 1) {
806e2684
DG
3123 /* Data is still being extracted for the kernel. */
3124 goto error;
3125 }
3126 }
3127
3128 if (usess && usess->consumer) {
6d805429
DG
3129 ret = consumer_is_data_pending(usess->id, usess->consumer);
3130 if (ret == 1) {
806e2684
DG
3131 /* Data is still being extracted for the kernel. */
3132 goto error;
3133 }
3134 }
3135
3136 /* Data is ready to be read by a viewer */
6d805429 3137 ret = 0;
806e2684
DG
3138
3139error:
3140 return ret;
3141}
3142
6dc3064a
DG
3143/*
3144 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
3145 *
3146 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3147 */
3148int cmd_snapshot_add_output(struct ltt_session *session,
3149 struct lttng_snapshot_output *output, uint32_t *id)
3150{
3151 int ret;
3152 struct snapshot_output *new_output;
3153
3154 assert(session);
3155 assert(output);
3156
3157 DBG("Cmd snapshot add output for session %s", session->name);
3158
3159 /*
903ef685 3160 * Can't create an output if the session is not set in no-output mode.
6dc3064a
DG
3161 */
3162 if (session->output_traces) {
903ef685 3163 ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
6dc3064a
DG
3164 goto error;
3165 }
3166
3167 /* Only one output is allowed until we have the "tee" feature. */
3168 if (session->snapshot.nb_output == 1) {
3169 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
3170 goto error;
3171 }
3172
3173 new_output = snapshot_output_alloc();
3174 if (!new_output) {
3175 ret = LTTNG_ERR_NOMEM;
3176 goto error;
3177 }
3178
3179 ret = snapshot_output_init(output->max_size, output->name,
3180 output->ctrl_url, output->data_url, session->consumer, new_output,
3181 &session->snapshot);
3182 if (ret < 0) {
3183 if (ret == -ENOMEM) {
3184 ret = LTTNG_ERR_NOMEM;
3185 } else {
3186 ret = LTTNG_ERR_INVALID;
3187 }
3188 goto free_error;
3189 }
3190
6dc3064a
DG
3191 rcu_read_lock();
3192 snapshot_add_output(&session->snapshot, new_output);
3193 if (id) {
3194 *id = new_output->id;
3195 }
3196 rcu_read_unlock();
3197
3198 return LTTNG_OK;
3199
3200free_error:
3201 snapshot_output_destroy(new_output);
3202error:
3203 return ret;
3204}
3205
3206/*
3207 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
3208 *
3209 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3210 */
3211int cmd_snapshot_del_output(struct ltt_session *session,
3212 struct lttng_snapshot_output *output)
3213{
3214 int ret;
eb240553 3215 struct snapshot_output *sout = NULL;
6dc3064a
DG
3216
3217 assert(session);
3218 assert(output);
3219
6dc3064a
DG
3220 rcu_read_lock();
3221
3222 /*
d3f14b8a
MD
3223 * Permission denied to create an output if the session is not
3224 * set in no output mode.
6dc3064a
DG
3225 */
3226 if (session->output_traces) {
903ef685 3227 ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
6dc3064a
DG
3228 goto error;
3229 }
3230
eb240553
DG
3231 if (output->id) {
3232 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
3233 session->name);
3234 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
3235 } else if (*output->name != '\0') {
3236 DBG("Cmd snapshot del output name %s for session %s", output->name,
3237 session->name);
3238 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
3239 }
6dc3064a
DG
3240 if (!sout) {
3241 ret = LTTNG_ERR_INVALID;
3242 goto error;
3243 }
3244
3245 snapshot_delete_output(&session->snapshot, sout);
3246 snapshot_output_destroy(sout);
3247 ret = LTTNG_OK;
3248
3249error:
3250 rcu_read_unlock();
3251 return ret;
3252}
3253
3254/*
3255 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
3256 *
3257 * If no output is available, outputs is untouched and 0 is returned.
3258 *
3259 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
3260 */
3261ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
3262 struct lttng_snapshot_output **outputs)
3263{
3264 int ret, idx = 0;
b223ca94 3265 struct lttng_snapshot_output *list = NULL;
6dc3064a
DG
3266 struct lttng_ht_iter iter;
3267 struct snapshot_output *output;
3268
3269 assert(session);
3270 assert(outputs);
3271
3272 DBG("Cmd snapshot list outputs for session %s", session->name);
3273
3274 /*
d3f14b8a
MD
3275 * Permission denied to create an output if the session is not
3276 * set in no output mode.
6dc3064a
DG
3277 */
3278 if (session->output_traces) {
903ef685
JG
3279 ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION;
3280 goto end;
6dc3064a
DG
3281 }
3282
3283 if (session->snapshot.nb_output == 0) {
3284 ret = 0;
903ef685 3285 goto end;
6dc3064a
DG
3286 }
3287
3288 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
3289 if (!list) {
b223ca94 3290 ret = -LTTNG_ERR_NOMEM;
903ef685 3291 goto end;
6dc3064a
DG
3292 }
3293
3294 /* Copy list from session to the new list object. */
b223ca94 3295 rcu_read_lock();
6dc3064a
DG
3296 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
3297 output, node.node) {
3298 assert(output->consumer);
3299 list[idx].id = output->id;
3300 list[idx].max_size = output->max_size;
6ce22875
MD
3301 if (lttng_strncpy(list[idx].name, output->name,
3302 sizeof(list[idx].name))) {
3303 ret = -LTTNG_ERR_INVALID;
903ef685 3304 goto error;
6ce22875 3305 }
6dc3064a 3306 if (output->consumer->type == CONSUMER_DST_LOCAL) {
6ce22875
MD
3307 if (lttng_strncpy(list[idx].ctrl_url,
3308 output->consumer->dst.trace_path,
3309 sizeof(list[idx].ctrl_url))) {
3310 ret = -LTTNG_ERR_INVALID;
903ef685 3311 goto error;
6ce22875 3312 }
6dc3064a
DG
3313 } else {
3314 /* Control URI. */
3315 ret = uri_to_str_url(&output->consumer->dst.net.control,
3316 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
3317 if (ret < 0) {
b223ca94 3318 ret = -LTTNG_ERR_NOMEM;
903ef685 3319 goto error;
6dc3064a
DG
3320 }
3321
3322 /* Data URI. */
3323 ret = uri_to_str_url(&output->consumer->dst.net.data,
3324 list[idx].data_url, sizeof(list[idx].data_url));
3325 if (ret < 0) {
b223ca94 3326 ret = -LTTNG_ERR_NOMEM;
903ef685 3327 goto error;
6dc3064a
DG
3328 }
3329 }
3330 idx++;
3331 }
3332
3333 *outputs = list;
b223ca94
JG
3334 list = NULL;
3335 ret = session->snapshot.nb_output;
6dc3064a 3336error:
903ef685 3337 rcu_read_unlock();
b223ca94 3338 free(list);
903ef685 3339end:
b223ca94 3340 return ret;
6dc3064a
DG
3341}
3342
93ec662e
JD
3343/*
3344 * Check if we can regenerate the metadata for this session.
3345 * Only kernel, UST per-uid and non-live sessions are supported.
3346 *
3347 * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise.
3348 */
3349static
eded6438 3350int check_regenerate_metadata_support(struct ltt_session *session)
93ec662e
JD
3351{