Fix: duplicated kernel consumer socket locking
[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>
6e21424e 37#include <lttng/channel.h>
b0880ae5 38#include <lttng/channel-internal.h>
9f449915 39#include <common/string-utils/string-utils.h>
2f77fc4b
DG
40
41#include "channel.h"
42#include "consumer.h"
43#include "event.h"
8782cc74 44#include "health-sessiond.h"
2f77fc4b
DG
45#include "kernel.h"
46#include "kernel-consumer.h"
47#include "lttng-sessiond.h"
48#include "utils.h"
834978fd 49#include "syscall.h"
7c1d2758 50#include "agent.h"
93ec662e 51#include "buffer-registry.h"
b0880ae5
JG
52#include "notification-thread.h"
53#include "notification-thread-commands.h"
2f77fc4b
DG
54
55#include "cmd.h"
56
57/*
58 * Used to keep a unique index for each relayd socket created where this value
59 * is associated with streams on the consumer so it can match the right relayd
d88aee68
DG
60 * to send to. It must be accessed with the relayd_net_seq_idx_lock
61 * held.
2f77fc4b 62 */
d88aee68
DG
63static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
64static uint64_t relayd_net_seq_idx;
2f77fc4b 65
7076b56e
JG
66static int validate_ust_event_name(const char *);
67static int cmd_enable_event_internal(struct ltt_session *session,
68 struct lttng_domain *domain,
69 char *channel_name, struct lttng_event *event,
70 char *filter_expression,
71 struct lttng_filter_bytecode *filter,
72 struct lttng_event_exclusion *exclusion,
73 int wpipe);
74
2f77fc4b
DG
75/*
76 * Create a session path used by list_lttng_sessions for the case that the
77 * session consumer is on the network.
78 */
79static int build_network_session_path(char *dst, size_t size,
80 struct ltt_session *session)
81{
82 int ret, kdata_port, udata_port;
83 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
84 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
85
86 assert(session);
87 assert(dst);
88
89 memset(tmp_urls, 0, sizeof(tmp_urls));
90 memset(tmp_uurl, 0, sizeof(tmp_uurl));
91
92 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
93
94 if (session->kernel_session && session->kernel_session->consumer) {
95 kuri = &session->kernel_session->consumer->dst.net.control;
96 kdata_port = session->kernel_session->consumer->dst.net.data.port;
97 }
98
99 if (session->ust_session && session->ust_session->consumer) {
100 uuri = &session->ust_session->consumer->dst.net.control;
101 udata_port = session->ust_session->consumer->dst.net.data.port;
102 }
103
104 if (uuri == NULL && kuri == NULL) {
105 uri = &session->consumer->dst.net.control;
106 kdata_port = session->consumer->dst.net.data.port;
107 } else if (kuri && uuri) {
108 ret = uri_compare(kuri, uuri);
109 if (ret) {
110 /* Not Equal */
111 uri = kuri;
112 /* Build uuri URL string */
113 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
114 if (ret < 0) {
115 goto error;
116 }
117 } else {
118 uri = kuri;
119 }
120 } else if (kuri && uuri == NULL) {
121 uri = kuri;
122 } else if (uuri && kuri == NULL) {
123 uri = uuri;
124 }
125
126 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
127 if (ret < 0) {
128 goto error;
129 }
130
9aa9f900
DG
131 /*
132 * Do we have a UST url set. If yes, this means we have both kernel and UST
133 * to print.
134 */
9d035200 135 if (*tmp_uurl != '\0') {
2f77fc4b
DG
136 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
137 tmp_urls, kdata_port, tmp_uurl, udata_port);
138 } else {
9aa9f900 139 int dport;
bef08707 140 if (kuri || (!kuri && !uuri)) {
9aa9f900
DG
141 dport = kdata_port;
142 } else {
143 /* No kernel URI, use the UST port. */
144 dport = udata_port;
145 }
146 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
2f77fc4b
DG
147 }
148
149error:
150 return ret;
151}
152
fb83fe64
JD
153/*
154 * Get run-time attributes if the session has been started (discarded events,
155 * lost packets).
156 */
157static int get_kernel_runtime_stats(struct ltt_session *session,
158 struct ltt_kernel_channel *kchan, uint64_t *discarded_events,
159 uint64_t *lost_packets)
160{
161 int ret;
162
163 if (!session->has_been_started) {
164 ret = 0;
165 *discarded_events = 0;
166 *lost_packets = 0;
167 goto end;
168 }
169
170 ret = consumer_get_discarded_events(session->id, kchan->fd,
171 session->kernel_session->consumer,
172 discarded_events);
173 if (ret < 0) {
174 goto end;
175 }
176
177 ret = consumer_get_lost_packets(session->id, kchan->fd,
178 session->kernel_session->consumer,
179 lost_packets);
180 if (ret < 0) {
181 goto end;
182 }
183
184end:
185 return ret;
186}
187
188/*
189 * Get run-time attributes if the session has been started (discarded events,
190 * lost packets).
191 */
192static int get_ust_runtime_stats(struct ltt_session *session,
193 struct ltt_ust_channel *uchan, uint64_t *discarded_events,
194 uint64_t *lost_packets)
195{
196 int ret;
197 struct ltt_ust_session *usess;
198
a91c5803
JG
199 if (!discarded_events || !lost_packets) {
200 ret = -1;
201 goto end;
202 }
203
fb83fe64 204 usess = session->ust_session;
a905c624
JG
205 assert(discarded_events);
206 assert(lost_packets);
fb83fe64
JD
207
208 if (!usess || !session->has_been_started) {
209 *discarded_events = 0;
210 *lost_packets = 0;
211 ret = 0;
212 goto end;
213 }
214
215 if (usess->buffer_type == LTTNG_BUFFER_PER_UID) {
216 ret = ust_app_uid_get_channel_runtime_stats(usess->id,
217 &usess->buffer_reg_uid_list,
218 usess->consumer, uchan->id,
219 uchan->attr.overwrite,
220 discarded_events,
221 lost_packets);
222 } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) {
223 ret = ust_app_pid_get_channel_runtime_stats(usess,
224 uchan, usess->consumer,
225 uchan->attr.overwrite,
226 discarded_events,
227 lost_packets);
228 if (ret < 0) {
229 goto end;
230 }
231 *discarded_events += uchan->per_pid_closed_app_discarded;
232 *lost_packets += uchan->per_pid_closed_app_lost;
233 } else {
234 ERR("Unsupported buffer type");
967bc289 235 assert(0);
fb83fe64
JD
236 ret = -1;
237 goto end;
238 }
239
240end:
241 return ret;
242}
243
2f77fc4b
DG
244/*
245 * Fill lttng_channel array of all channels.
246 */
d449df4a 247static ssize_t list_lttng_channels(enum lttng_domain_type domain,
fb83fe64 248 struct ltt_session *session, struct lttng_channel *channels,
cf0bcb51 249 struct lttng_channel_extended *chan_exts)
2f77fc4b 250{
d449df4a 251 int i = 0, ret = 0;
2f77fc4b
DG
252 struct ltt_kernel_channel *kchan;
253
254 DBG("Listing channels for session %s", session->name);
255
256 switch (domain) {
257 case LTTNG_DOMAIN_KERNEL:
258 /* Kernel channels */
259 if (session->kernel_session != NULL) {
260 cds_list_for_each_entry(kchan,
261 &session->kernel_session->channel_list.head, list) {
fb83fe64 262 uint64_t discarded_events, lost_packets;
cf0bcb51
JG
263 struct lttng_channel_extended *extended;
264
265 extended = (struct lttng_channel_extended *)
266 kchan->channel->attr.extended.ptr;
fb83fe64
JD
267
268 ret = get_kernel_runtime_stats(session, kchan,
269 &discarded_events, &lost_packets);
270 if (ret < 0) {
271 goto end;
272 }
2f77fc4b
DG
273 /* Copy lttng_channel struct to array */
274 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
275 channels[i].enabled = kchan->enabled;
fb83fe64
JD
276 chan_exts[i].discarded_events =
277 discarded_events;
278 chan_exts[i].lost_packets = lost_packets;
cf0bcb51
JG
279 chan_exts[i].monitor_timer_interval =
280 extended->monitor_timer_interval;
491d1539 281 chan_exts[i].blocking_timeout = 0;
2f77fc4b
DG
282 i++;
283 }
284 }
285 break;
286 case LTTNG_DOMAIN_UST:
287 {
288 struct lttng_ht_iter iter;
289 struct ltt_ust_channel *uchan;
290
e7fe706f 291 rcu_read_lock();
2f77fc4b
DG
292 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
293 &iter.iter, uchan, node.node) {
a91c5803 294 uint64_t discarded_events = 0, lost_packets = 0;
fb83fe64 295
8ee609c8
MD
296 if (lttng_strncpy(channels[i].name, uchan->name,
297 LTTNG_SYMBOL_NAME_LEN)) {
298 break;
299 }
2f77fc4b
DG
300 channels[i].attr.overwrite = uchan->attr.overwrite;
301 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
302 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
303 channels[i].attr.switch_timer_interval =
304 uchan->attr.switch_timer_interval;
305 channels[i].attr.read_timer_interval =
306 uchan->attr.read_timer_interval;
307 channels[i].enabled = uchan->enabled;
2f785fe7
DG
308 channels[i].attr.tracefile_size = uchan->tracefile_size;
309 channels[i].attr.tracefile_count = uchan->tracefile_count;
5e4435a4
JG
310
311 /*
312 * Map enum lttng_ust_output to enum lttng_event_output.
313 */
2f77fc4b
DG
314 switch (uchan->attr.output) {
315 case LTTNG_UST_MMAP:
2f77fc4b
DG
316 channels[i].attr.output = LTTNG_EVENT_MMAP;
317 break;
5e4435a4
JG
318 default:
319 /*
320 * LTTNG_UST_MMAP is the only supported UST
321 * output mode.
322 */
323 assert(0);
324 break;
2f77fc4b 325 }
fb83fe64 326
d449df4a
MD
327 chan_exts[i].monitor_timer_interval =
328 uchan->monitor_timer_interval;
491d1539
MD
329 chan_exts[i].blocking_timeout =
330 uchan->attr.u.s.blocking_timeout;
d449df4a 331
fb83fe64
JD
332 ret = get_ust_runtime_stats(session, uchan,
333 &discarded_events, &lost_packets);
334 if (ret < 0) {
335 break;
336 }
337 chan_exts[i].discarded_events = discarded_events;
338 chan_exts[i].lost_packets = lost_packets;
2f77fc4b
DG
339 i++;
340 }
e7fe706f 341 rcu_read_unlock();
2f77fc4b
DG
342 break;
343 }
344 default:
345 break;
346 }
fb83fe64
JD
347
348end:
d449df4a
MD
349 if (ret < 0) {
350 return -LTTNG_ERR_FATAL;
351 } else {
352 return LTTNG_OK;
353 }
2f77fc4b
DG
354}
355
b4e3ceb9 356static void increment_extended_len(const char *filter_expression,
795d57ce 357 struct lttng_event_exclusion *exclusion, size_t *extended_len)
b4e3ceb9
PP
358{
359 *extended_len += sizeof(struct lttcomm_event_extended_header);
360
361 if (filter_expression) {
362 *extended_len += strlen(filter_expression) + 1;
363 }
795d57ce
PP
364
365 if (exclusion) {
366 *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN;
367 }
b4e3ceb9
PP
368}
369
370static void append_extended_info(const char *filter_expression,
795d57ce 371 struct lttng_event_exclusion *exclusion, void **extended_at)
b4e3ceb9
PP
372{
373 struct lttcomm_event_extended_header extended_header;
374 size_t filter_len = 0;
795d57ce 375 size_t nb_exclusions = 0;
b4e3ceb9
PP
376
377 if (filter_expression) {
378 filter_len = strlen(filter_expression) + 1;
379 }
380
795d57ce
PP
381 if (exclusion) {
382 nb_exclusions = exclusion->count;
383 }
384
385 /* Set header fields */
b4e3ceb9 386 extended_header.filter_len = filter_len;
795d57ce
PP
387 extended_header.nb_exclusions = nb_exclusions;
388
389 /* Copy header */
b4e3ceb9
PP
390 memcpy(*extended_at, &extended_header, sizeof(extended_header));
391 *extended_at += sizeof(extended_header);
795d57ce
PP
392
393 /* Copy filter string */
394 if (filter_expression) {
395 memcpy(*extended_at, filter_expression, filter_len);
396 *extended_at += filter_len;
397 }
398
399 /* Copy exclusion names */
400 if (exclusion) {
401 size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
402
403 memcpy(*extended_at, &exclusion->names, len);
404 *extended_at += len;
405 }
b4e3ceb9
PP
406}
407
3c6a091f 408/*
022d91ba 409 * Create a list of agent domain events.
3c6a091f
DG
410 *
411 * Return number of events in list on success or else a negative value.
412 */
022d91ba 413static int list_lttng_agent_events(struct agent *agt,
b4e3ceb9 414 struct lttng_event **events, size_t *total_size)
3c6a091f
DG
415{
416 int i = 0, ret = 0;
417 unsigned int nb_event = 0;
022d91ba 418 struct agent_event *event;
3c6a091f
DG
419 struct lttng_event *tmp_events;
420 struct lttng_ht_iter iter;
b4e3ceb9
PP
421 size_t extended_len = 0;
422 void *extended_at;
3c6a091f 423
022d91ba 424 assert(agt);
3c6a091f
DG
425 assert(events);
426
022d91ba 427 DBG3("Listing agent events");
3c6a091f 428
e5bbf678 429 rcu_read_lock();
022d91ba 430 nb_event = lttng_ht_get_count(agt->events);
e5bbf678 431 rcu_read_unlock();
3c6a091f
DG
432 if (nb_event == 0) {
433 ret = nb_event;
b4e3ceb9 434 *total_size = 0;
3c6a091f
DG
435 goto error;
436 }
437
b4e3ceb9
PP
438 /* Compute required extended infos size */
439 extended_len = nb_event * sizeof(struct lttcomm_event_extended_header);
440
441 /*
442 * This is only valid because the commands which add events are
443 * processed in the same thread as the listing.
444 */
445 rcu_read_lock();
446 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
795d57ce
PP
447 increment_extended_len(event->filter_expression, NULL,
448 &extended_len);
b4e3ceb9
PP
449 }
450 rcu_read_unlock();
451
452 *total_size = nb_event * sizeof(*tmp_events) + extended_len;
453 tmp_events = zmalloc(*total_size);
3c6a091f 454 if (!tmp_events) {
022d91ba 455 PERROR("zmalloc agent events session");
3c6a091f
DG
456 ret = -LTTNG_ERR_FATAL;
457 goto error;
458 }
459
b4e3ceb9
PP
460 extended_at = ((uint8_t *) tmp_events) +
461 nb_event * sizeof(struct lttng_event);
462
3c6a091f 463 rcu_read_lock();
022d91ba 464 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
3c6a091f
DG
465 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
466 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
467 tmp_events[i].enabled = event->enabled;
2106efa0 468 tmp_events[i].loglevel = event->loglevel_value;
ff94328f 469 tmp_events[i].loglevel_type = event->loglevel_type;
3c6a091f 470 i++;
b4e3ceb9
PP
471
472 /* Append extended info */
795d57ce
PP
473 append_extended_info(event->filter_expression, NULL,
474 &extended_at);
3c6a091f
DG
475 }
476 rcu_read_unlock();
477
478 *events = tmp_events;
479 ret = nb_event;
480
481error:
482 assert(nb_event == i);
483 return ret;
484}
485
2f77fc4b
DG
486/*
487 * Create a list of ust global domain events.
488 */
489static int list_lttng_ust_global_events(char *channel_name,
b4e3ceb9
PP
490 struct ltt_ust_domain_global *ust_global,
491 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
492{
493 int i = 0, ret = 0;
494 unsigned int nb_event = 0;
495 struct lttng_ht_iter iter;
496 struct lttng_ht_node_str *node;
497 struct ltt_ust_channel *uchan;
498 struct ltt_ust_event *uevent;
499 struct lttng_event *tmp;
b4e3ceb9
PP
500 size_t extended_len = 0;
501 void *extended_at;
2f77fc4b
DG
502
503 DBG("Listing UST global events for channel %s", channel_name);
504
505 rcu_read_lock();
506
507 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
508 node = lttng_ht_iter_get_node_str(&iter);
509 if (node == NULL) {
f73fabfd 510 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
d31d3e8c 511 goto end;
2f77fc4b
DG
512 }
513
514 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
515
3c442be3 516 nb_event = lttng_ht_get_count(uchan->events);
2f77fc4b
DG
517 if (nb_event == 0) {
518 ret = nb_event;
b4e3ceb9 519 *total_size = 0;
d31d3e8c 520 goto end;
2f77fc4b
DG
521 }
522
523 DBG3("Listing UST global %d events", nb_event);
524
b4e3ceb9
PP
525 /* Compute required extended infos size */
526 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
527 if (uevent->internal) {
528 nb_event--;
529 continue;
530 }
531
532 increment_extended_len(uevent->filter_expression,
795d57ce 533 uevent->exclusion, &extended_len);
b4e3ceb9 534 }
d31d3e8c
PP
535 if (nb_event == 0) {
536 /* All events are internal, skip. */
537 ret = 0;
538 *total_size = 0;
539 goto end;
540 }
b4e3ceb9
PP
541
542 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
543 tmp = zmalloc(*total_size);
2f77fc4b 544 if (tmp == NULL) {
b12c38df
JG
545 ret = -LTTNG_ERR_FATAL;
546 goto end;
2f77fc4b
DG
547 }
548
b4e3ceb9
PP
549 extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event);
550
2f77fc4b 551 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
3c442be3
JG
552 if (uevent->internal) {
553 /* This event should remain hidden from clients */
3c442be3
JG
554 continue;
555 }
2f77fc4b
DG
556 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
557 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
558 tmp[i].enabled = uevent->enabled;
559
560 switch (uevent->attr.instrumentation) {
561 case LTTNG_UST_TRACEPOINT:
562 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
563 break;
564 case LTTNG_UST_PROBE:
565 tmp[i].type = LTTNG_EVENT_PROBE;
566 break;
567 case LTTNG_UST_FUNCTION:
568 tmp[i].type = LTTNG_EVENT_FUNCTION;
569 break;
570 }
571
572 tmp[i].loglevel = uevent->attr.loglevel;
573 switch (uevent->attr.loglevel_type) {
574 case LTTNG_UST_LOGLEVEL_ALL:
575 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
576 break;
577 case LTTNG_UST_LOGLEVEL_RANGE:
578 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
579 break;
580 case LTTNG_UST_LOGLEVEL_SINGLE:
581 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
582 break;
583 }
584 if (uevent->filter) {
585 tmp[i].filter = 1;
586 }
4634f12e
JI
587 if (uevent->exclusion) {
588 tmp[i].exclusion = 1;
589 }
2f77fc4b 590 i++;
b4e3ceb9
PP
591
592 /* Append extended info */
795d57ce
PP
593 append_extended_info(uevent->filter_expression,
594 uevent->exclusion, &extended_at);
2f77fc4b
DG
595 }
596
597 ret = nb_event;
598 *events = tmp;
d31d3e8c 599end:
2f77fc4b
DG
600 rcu_read_unlock();
601 return ret;
602}
603
604/*
605 * Fill lttng_event array of all kernel events in the channel.
606 */
607static int list_lttng_kernel_events(char *channel_name,
b4e3ceb9
PP
608 struct ltt_kernel_session *kernel_session,
609 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
610{
611 int i = 0, ret;
612 unsigned int nb_event;
613 struct ltt_kernel_event *event;
614 struct ltt_kernel_channel *kchan;
b4e3ceb9
PP
615 size_t extended_len = 0;
616 void *extended_at;
2f77fc4b
DG
617
618 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
619 if (kchan == NULL) {
f73fabfd 620 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG
621 goto error;
622 }
623
624 nb_event = kchan->event_count;
625
626 DBG("Listing events for channel %s", kchan->channel->name);
627
628 if (nb_event == 0) {
b4e3ceb9 629 *total_size = 0;
834978fd 630 *events = NULL;
db906c12 631 goto end;
2f77fc4b
DG
632 }
633
b4e3ceb9
PP
634 /* Compute required extended infos size */
635 cds_list_for_each_entry(event, &kchan->events_list.head, list) {
795d57ce
PP
636 increment_extended_len(event->filter_expression, NULL,
637 &extended_len);
b4e3ceb9
PP
638 }
639
640 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
641 *events = zmalloc(*total_size);
2f77fc4b 642 if (*events == NULL) {
f73fabfd 643 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
644 goto error;
645 }
646
ab4aa612 647 extended_at = ((void *) *events) +
b4e3ceb9
PP
648 nb_event * sizeof(struct lttng_event);
649
2f77fc4b
DG
650 /* Kernel channels */
651 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
652 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
653 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
654 (*events)[i].enabled = event->enabled;
00f992f2
JG
655 (*events)[i].filter =
656 (unsigned char) !!event->filter_expression;
2f77fc4b
DG
657
658 switch (event->event->instrumentation) {
659 case LTTNG_KERNEL_TRACEPOINT:
660 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
661 break;
2f77fc4b 662 case LTTNG_KERNEL_KRETPROBE:
1896972b
DG
663 (*events)[i].type = LTTNG_EVENT_FUNCTION;
664 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
665 sizeof(struct lttng_kernel_kprobe));
666 break;
667 case LTTNG_KERNEL_KPROBE:
2f77fc4b
DG
668 (*events)[i].type = LTTNG_EVENT_PROBE;
669 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
670 sizeof(struct lttng_kernel_kprobe));
671 break;
672 case LTTNG_KERNEL_FUNCTION:
673 (*events)[i].type = LTTNG_EVENT_FUNCTION;
674 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
675 sizeof(struct lttng_kernel_function));
676 break;
677 case LTTNG_KERNEL_NOOP:
678 (*events)[i].type = LTTNG_EVENT_NOOP;
679 break;
680 case LTTNG_KERNEL_SYSCALL:
681 (*events)[i].type = LTTNG_EVENT_SYSCALL;
682 break;
683 case LTTNG_KERNEL_ALL:
684 assert(0);
685 break;
686 }
687 i++;
b4e3ceb9
PP
688
689 /* Append extended info */
795d57ce
PP
690 append_extended_info(event->filter_expression, NULL,
691 &extended_at);
2f77fc4b
DG
692 }
693
db906c12 694end:
2f77fc4b
DG
695 return nb_event;
696
697error:
f73fabfd
DG
698 /* Negate the error code to differentiate the size from an error */
699 return -ret;
2f77fc4b
DG
700}
701
702/*
703 * Add URI so the consumer output object. Set the correct path depending on the
704 * domain adding the default trace directory.
705 */
706static int add_uri_to_consumer(struct consumer_output *consumer,
56a37563
JG
707 struct lttng_uri *uri, enum lttng_domain_type domain,
708 const char *session_name)
2f77fc4b 709{
f73fabfd 710 int ret = LTTNG_OK;
2f77fc4b
DG
711 const char *default_trace_dir;
712
713 assert(uri);
714
715 if (consumer == NULL) {
716 DBG("No consumer detected. Don't add URI. Stopping.");
f73fabfd 717 ret = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
718 goto error;
719 }
720
721 switch (domain) {
722 case LTTNG_DOMAIN_KERNEL:
723 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
724 break;
725 case LTTNG_DOMAIN_UST:
726 default_trace_dir = DEFAULT_UST_TRACE_DIR;
727 break;
728 default:
729 /*
730 * This case is possible is we try to add the URI to the global tracing
731 * session consumer object which in this case there is no subdir.
732 */
733 default_trace_dir = "";
734 }
735
736 switch (uri->dtype) {
737 case LTTNG_DST_IPV4:
738 case LTTNG_DST_IPV6:
739 DBG2("Setting network URI to consumer");
740
df75acac
DG
741 if (consumer->type == CONSUMER_DST_NET) {
742 if ((uri->stype == LTTNG_STREAM_CONTROL &&
785d2d0d
DG
743 consumer->dst.net.control_isset) ||
744 (uri->stype == LTTNG_STREAM_DATA &&
745 consumer->dst.net.data_isset)) {
df75acac
DG
746 ret = LTTNG_ERR_URL_EXIST;
747 goto error;
748 }
749 } else {
750 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
785d2d0d
DG
751 }
752
df75acac
DG
753 consumer->type = CONSUMER_DST_NET;
754
2f77fc4b
DG
755 /* Set URI into consumer output object */
756 ret = consumer_set_network_uri(consumer, uri);
757 if (ret < 0) {
a74934ba 758 ret = -ret;
2f77fc4b
DG
759 goto error;
760 } else if (ret == 1) {
761 /*
762 * URI was the same in the consumer so we do not append the subdir
763 * again so to not duplicate output dir.
764 */
f86c9f4e 765 ret = LTTNG_OK;
2f77fc4b
DG
766 goto error;
767 }
768
769 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
770 ret = consumer_set_subdir(consumer, session_name);
771 if (ret < 0) {
f73fabfd 772 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
773 goto error;
774 }
775 }
776
777 if (uri->stype == LTTNG_STREAM_CONTROL) {
778 /* On a new subdir, reappend the default trace dir. */
c30ce0b3
CB
779 strncat(consumer->subdir, default_trace_dir,
780 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2f77fc4b
DG
781 DBG3("Append domain trace name to subdir %s", consumer->subdir);
782 }
783
784 break;
785 case LTTNG_DST_PATH:
786 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
787 memset(consumer->dst.trace_path, 0,
788 sizeof(consumer->dst.trace_path));
9ac05d92
MD
789 /* Explicit length checks for strcpy and strcat. */
790 if (strlen(uri->dst.path) + strlen(default_trace_dir)
791 >= sizeof(consumer->dst.trace_path)) {
792 ret = LTTNG_ERR_FATAL;
793 goto error;
794 }
795 strcpy(consumer->dst.trace_path, uri->dst.path);
2f77fc4b 796 /* Append default trace dir */
9ac05d92 797 strcat(consumer->dst.trace_path, default_trace_dir);
2f77fc4b
DG
798 /* Flag consumer as local. */
799 consumer->type = CONSUMER_DST_LOCAL;
800 break;
801 }
802
a74934ba
DG
803 ret = LTTNG_OK;
804
2f77fc4b
DG
805error:
806 return ret;
807}
808
809/*
810 * Init tracing by creating trace directory and sending fds kernel consumer.
811 */
812static int init_kernel_tracing(struct ltt_kernel_session *session)
813{
814 int ret = 0;
815 struct lttng_ht_iter iter;
816 struct consumer_socket *socket;
817
818 assert(session);
819
e7fe706f
DG
820 rcu_read_lock();
821
2f77fc4b
DG
822 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
823 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
824 socket, node.node) {
2f77fc4b 825 pthread_mutex_lock(socket->lock);
f50f23d9 826 ret = kernel_consumer_send_session(socket, session);
2f77fc4b
DG
827 pthread_mutex_unlock(socket->lock);
828 if (ret < 0) {
f73fabfd 829 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
830 goto error;
831 }
832 }
833 }
834
835error:
e7fe706f 836 rcu_read_unlock();
2f77fc4b
DG
837 return ret;
838}
839
840/*
841 * Create a socket to the relayd using the URI.
842 *
843 * On success, the relayd_sock pointer is set to the created socket.
844 * Else, it's stays untouched and a lttcomm error code is returned.
845 */
6151a90f 846static int create_connect_relayd(struct lttng_uri *uri,
b31610f2
JD
847 struct lttcomm_relayd_sock **relayd_sock,
848 struct consumer_output *consumer)
2f77fc4b
DG
849{
850 int ret;
6151a90f 851 struct lttcomm_relayd_sock *rsock;
2f77fc4b 852
6151a90f
JD
853 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
854 RELAYD_VERSION_COMM_MINOR);
855 if (!rsock) {
f73fabfd 856 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
857 goto error;
858 }
859
ffe60014
DG
860 /*
861 * Connect to relayd so we can proceed with a session creation. This call
862 * can possibly block for an arbitrary amount of time to set the health
863 * state to be in poll execution.
864 */
865 health_poll_entry();
6151a90f 866 ret = relayd_connect(rsock);
ffe60014 867 health_poll_exit();
2f77fc4b
DG
868 if (ret < 0) {
869 ERR("Unable to reach lttng-relayd");
f73fabfd 870 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG
871 goto free_sock;
872 }
873
874 /* Create socket for control stream. */
875 if (uri->stype == LTTNG_STREAM_CONTROL) {
876 DBG3("Creating relayd stream socket from URI");
877
878 /* Check relayd version */
6151a90f 879 ret = relayd_version_check(rsock);
2f77fc4b 880 if (ret < 0) {
f73fabfd 881 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
2f77fc4b
DG
882 goto close_sock;
883 }
b31610f2
JD
884 consumer->relay_major_version = rsock->major;
885 consumer->relay_minor_version = rsock->minor;
2f77fc4b
DG
886 } else if (uri->stype == LTTNG_STREAM_DATA) {
887 DBG3("Creating relayd data socket from URI");
888 } else {
889 /* Command is not valid */
890 ERR("Relayd invalid stream type: %d", uri->stype);
f73fabfd 891 ret = LTTNG_ERR_INVALID;
2f77fc4b
DG
892 goto close_sock;
893 }
894
6151a90f 895 *relayd_sock = rsock;
2f77fc4b 896
f73fabfd 897 return LTTNG_OK;
2f77fc4b
DG
898
899close_sock:
6151a90f
JD
900 /* The returned value is not useful since we are on an error path. */
901 (void) relayd_close(rsock);
2f77fc4b 902free_sock:
6151a90f 903 free(rsock);
2f77fc4b
DG
904error:
905 return ret;
906}
907
908/*
909 * Connect to the relayd using URI and send the socket to the right consumer.
43fade62
JG
910 *
911 * The consumer socket lock must be held by the caller.
2f77fc4b 912 */
56a37563
JG
913static int send_consumer_relayd_socket(enum lttng_domain_type domain,
914 unsigned int session_id, struct lttng_uri *relayd_uri,
915 struct consumer_output *consumer,
d3e2ba59
JD
916 struct consumer_socket *consumer_sock,
917 char *session_name, char *hostname, int session_live_timer)
2f77fc4b
DG
918{
919 int ret;
6151a90f 920 struct lttcomm_relayd_sock *rsock = NULL;
2f77fc4b 921
ffe60014 922 /* Connect to relayd and make version check if uri is the control. */
b31610f2 923 ret = create_connect_relayd(relayd_uri, &rsock, consumer);
ffe60014 924 if (ret != LTTNG_OK) {
9e218353 925 goto relayd_comm_error;
ffe60014 926 }
6151a90f 927 assert(rsock);
ffe60014 928
2f77fc4b 929 /* Set the network sequence index if not set. */
d88aee68
DG
930 if (consumer->net_seq_index == (uint64_t) -1ULL) {
931 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
932 /*
933 * Increment net_seq_idx because we are about to transfer the
934 * new relayd socket to the consumer.
d88aee68 935 * Assign unique key so the consumer can match streams.
2f77fc4b 936 */
d88aee68
DG
937 consumer->net_seq_index = ++relayd_net_seq_idx;
938 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
939 }
940
2f77fc4b 941 /* Send relayd socket to consumer. */
6151a90f 942 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
d3e2ba59
JD
943 relayd_uri->stype, session_id,
944 session_name, hostname, session_live_timer);
2f77fc4b 945 if (ret < 0) {
f73fabfd 946 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
947 goto close_sock;
948 }
949
c890b720
DG
950 /* Flag that the corresponding socket was sent. */
951 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
ffe60014 952 consumer_sock->control_sock_sent = 1;
c890b720 953 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
ffe60014 954 consumer_sock->data_sock_sent = 1;
c890b720
DG
955 }
956
f73fabfd 957 ret = LTTNG_OK;
2f77fc4b
DG
958
959 /*
960 * Close socket which was dup on the consumer side. The session daemon does
961 * NOT keep track of the relayd socket(s) once transfer to the consumer.
962 */
963
964close_sock:
ffe60014
DG
965 if (ret != LTTNG_OK) {
966 /*
d9078d0c
DG
967 * The consumer output for this session should not be used anymore
968 * since the relayd connection failed thus making any tracing or/and
969 * streaming not usable.
ffe60014 970 */
d9078d0c 971 consumer->enabled = 0;
ffe60014 972 }
9e218353
JR
973 (void) relayd_close(rsock);
974 free(rsock);
975
976relayd_comm_error:
2f77fc4b
DG
977 return ret;
978}
979
980/*
981 * Send both relayd sockets to a specific consumer and domain. This is a
982 * helper function to facilitate sending the information to the consumer for a
983 * session.
43fade62
JG
984 *
985 * The consumer socket lock must be held by the caller.
2f77fc4b 986 */
56a37563
JG
987static int send_consumer_relayd_sockets(enum lttng_domain_type domain,
988 unsigned int session_id, struct consumer_output *consumer,
989 struct consumer_socket *sock, char *session_name,
990 char *hostname, int session_live_timer)
2f77fc4b 991{
dda67f6c 992 int ret = LTTNG_OK;
2f77fc4b 993
2f77fc4b 994 assert(consumer);
6dc3064a 995 assert(sock);
2f77fc4b 996
2f77fc4b 997 /* Sending control relayd socket. */
ffe60014 998 if (!sock->control_sock_sent) {
6dc3064a 999 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD
1000 &consumer->dst.net.control, consumer, sock,
1001 session_name, hostname, session_live_timer);
c890b720
DG
1002 if (ret != LTTNG_OK) {
1003 goto error;
1004 }
2f77fc4b
DG
1005 }
1006
1007 /* Sending data relayd socket. */
ffe60014 1008 if (!sock->data_sock_sent) {
6dc3064a 1009 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD
1010 &consumer->dst.net.data, consumer, sock,
1011 session_name, hostname, session_live_timer);
c890b720
DG
1012 if (ret != LTTNG_OK) {
1013 goto error;
1014 }
2f77fc4b
DG
1015 }
1016
2f77fc4b
DG
1017error:
1018 return ret;
1019}
1020
1021/*
1022 * Setup relayd connections for a tracing session. First creates the socket to
1023 * the relayd and send them to the right domain consumer. Consumer type MUST be
1024 * network.
1025 */
ffe60014 1026int cmd_setup_relayd(struct ltt_session *session)
2f77fc4b 1027{
f73fabfd 1028 int ret = LTTNG_OK;
2f77fc4b
DG
1029 struct ltt_ust_session *usess;
1030 struct ltt_kernel_session *ksess;
1031 struct consumer_socket *socket;
1032 struct lttng_ht_iter iter;
1033
1034 assert(session);
1035
1036 usess = session->ust_session;
1037 ksess = session->kernel_session;
1038
785d2d0d 1039 DBG("Setting relayd for session %s", session->name);
2f77fc4b 1040
e7fe706f
DG
1041 rcu_read_lock();
1042
2f77fc4b
DG
1043 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
1044 && usess->consumer->enabled) {
1045 /* For each consumer socket, send relayd sockets */
1046 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
1047 socket, node.node) {
2f77fc4b 1048 pthread_mutex_lock(socket->lock);
6dc3064a 1049 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
d3e2ba59
JD
1050 usess->consumer, socket,
1051 session->name, session->hostname,
1052 session->live_timer);
2f77fc4b 1053 pthread_mutex_unlock(socket->lock);
f73fabfd 1054 if (ret != LTTNG_OK) {
2f77fc4b
DG
1055 goto error;
1056 }
6dc3064a
DG
1057 /* Session is now ready for network streaming. */
1058 session->net_handle = 1;
2f77fc4b 1059 }
b31610f2
JD
1060 session->consumer->relay_major_version =
1061 usess->consumer->relay_major_version;
1062 session->consumer->relay_minor_version =
1063 usess->consumer->relay_minor_version;
2f77fc4b
DG
1064 }
1065
1066 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
1067 && ksess->consumer->enabled) {
1068 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
1069 socket, node.node) {
2f77fc4b 1070 pthread_mutex_lock(socket->lock);
6dc3064a 1071 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
d3e2ba59
JD
1072 ksess->consumer, socket,
1073 session->name, session->hostname,
1074 session->live_timer);
2f77fc4b 1075 pthread_mutex_unlock(socket->lock);
f73fabfd 1076 if (ret != LTTNG_OK) {
2f77fc4b
DG
1077 goto error;
1078 }
6dc3064a
DG
1079 /* Session is now ready for network streaming. */
1080 session->net_handle = 1;
2f77fc4b 1081 }
b31610f2
JD
1082 session->consumer->relay_major_version =
1083 ksess->consumer->relay_major_version;
1084 session->consumer->relay_minor_version =
1085 ksess->consumer->relay_minor_version;
2f77fc4b
DG
1086 }
1087
1088error:
e7fe706f 1089 rcu_read_unlock();
2f77fc4b
DG
1090 return ret;
1091}
1092
9b6c7ec5
DG
1093/*
1094 * Start a kernel session by opening all necessary streams.
1095 */
1096static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
1097{
1098 int ret;
1099 struct ltt_kernel_channel *kchan;
1100
1101 /* Open kernel metadata */
07b86b52 1102 if (ksess->metadata == NULL && ksess->output_traces) {
9b6c7ec5
DG
1103 ret = kernel_open_metadata(ksess);
1104 if (ret < 0) {
1105 ret = LTTNG_ERR_KERN_META_FAIL;
1106 goto error;
1107 }
1108 }
1109
1110 /* Open kernel metadata stream */
07b86b52 1111 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
9b6c7ec5
DG
1112 ret = kernel_open_metadata_stream(ksess);
1113 if (ret < 0) {
1114 ERR("Kernel create metadata stream failed");
1115 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1116 goto error;
1117 }
1118 }
1119
1120 /* For each channel */
1121 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
1122 if (kchan->stream_count == 0) {
1123 ret = kernel_open_channel_stream(kchan);
1124 if (ret < 0) {
1125 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1126 goto error;
1127 }
1128 /* Update the stream global counter */
1129 ksess->stream_count_global += ret;
1130 }
1131 }
1132
1133 /* Setup kernel consumer socket and send fds to it */
1134 ret = init_kernel_tracing(ksess);
e43c41c5 1135 if (ret != 0) {
9b6c7ec5
DG
1136 ret = LTTNG_ERR_KERN_START_FAIL;
1137 goto error;
1138 }
1139
1140 /* This start the kernel tracing */
1141 ret = kernel_start_session(ksess);
1142 if (ret < 0) {
1143 ret = LTTNG_ERR_KERN_START_FAIL;
1144 goto error;
1145 }
1146
1147 /* Quiescent wait after starting trace */
784303b0 1148 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5 1149
14fb1ebe 1150 ksess->active = 1;
9b6c7ec5
DG
1151
1152 ret = LTTNG_OK;
1153
1154error:
1155 return ret;
1156}
1157
2f77fc4b
DG
1158/*
1159 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1160 */
56a37563
JG
1161int cmd_disable_channel(struct ltt_session *session,
1162 enum lttng_domain_type domain, char *channel_name)
2f77fc4b
DG
1163{
1164 int ret;
1165 struct ltt_ust_session *usess;
1166
1167 usess = session->ust_session;
1168
2223c96f
DG
1169 rcu_read_lock();
1170
2f77fc4b
DG
1171 switch (domain) {
1172 case LTTNG_DOMAIN_KERNEL:
1173 {
1174 ret = channel_kernel_disable(session->kernel_session,
1175 channel_name);
f73fabfd 1176 if (ret != LTTNG_OK) {
2f77fc4b
DG
1177 goto error;
1178 }
1179
1180 kernel_wait_quiescent(kernel_tracer_fd);
1181 break;
1182 }
1183 case LTTNG_DOMAIN_UST:
1184 {
1185 struct ltt_ust_channel *uchan;
1186 struct lttng_ht *chan_ht;
1187
1188 chan_ht = usess->domain_global.channels;
1189
1190 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
1191 if (uchan == NULL) {
f73fabfd 1192 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
1193 goto error;
1194 }
1195
7972aab2 1196 ret = channel_ust_disable(usess, uchan);
f73fabfd 1197 if (ret != LTTNG_OK) {
2f77fc4b
DG
1198 goto error;
1199 }
1200 break;
1201 }
2f77fc4b 1202 default:
f73fabfd 1203 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1204 goto error;
1205 }
1206
f73fabfd 1207 ret = LTTNG_OK;
2f77fc4b
DG
1208
1209error:
2223c96f 1210 rcu_read_unlock();
2f77fc4b
DG
1211 return ret;
1212}
1213
ccf10263
MD
1214/*
1215 * Command LTTNG_TRACK_PID processed by the client thread.
a9ad0c8f
MD
1216 *
1217 * Called with session lock held.
ccf10263 1218 */
56a37563
JG
1219int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain,
1220 int pid)
ccf10263
MD
1221{
1222 int ret;
1223
1224 rcu_read_lock();
1225
1226 switch (domain) {
1227 case LTTNG_DOMAIN_KERNEL:
1228 {
1229 struct ltt_kernel_session *ksess;
1230
1231 ksess = session->kernel_session;
1232
1233 ret = kernel_track_pid(ksess, pid);
1234 if (ret != LTTNG_OK) {
1235 goto error;
1236 }
1237
1238 kernel_wait_quiescent(kernel_tracer_fd);
1239 break;
1240 }
ccf10263 1241 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
1242 {
1243 struct ltt_ust_session *usess;
1244
1245 usess = session->ust_session;
1246
1247 ret = trace_ust_track_pid(usess, pid);
1248 if (ret != LTTNG_OK) {
1249 goto error;
1250 }
1251 break;
1252 }
ccf10263
MD
1253 default:
1254 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1255 goto error;
1256 }
1257
1258 ret = LTTNG_OK;
1259
1260error:
1261 rcu_read_unlock();
1262 return ret;
1263}
1264
1265/*
1266 * Command LTTNG_UNTRACK_PID processed by the client thread.
a9ad0c8f
MD
1267 *
1268 * Called with session lock held.
ccf10263 1269 */
56a37563
JG
1270int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain,
1271 int pid)
ccf10263
MD
1272{
1273 int ret;
1274
1275 rcu_read_lock();
1276
1277 switch (domain) {
1278 case LTTNG_DOMAIN_KERNEL:
1279 {
1280 struct ltt_kernel_session *ksess;
1281
1282 ksess = session->kernel_session;
1283
1284 ret = kernel_untrack_pid(ksess, pid);
1285 if (ret != LTTNG_OK) {
1286 goto error;
1287 }
1288
1289 kernel_wait_quiescent(kernel_tracer_fd);
1290 break;
1291 }
ccf10263 1292 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
1293 {
1294 struct ltt_ust_session *usess;
1295
1296 usess = session->ust_session;
1297
1298 ret = trace_ust_untrack_pid(usess, pid);
1299 if (ret != LTTNG_OK) {
1300 goto error;
1301 }
1302 break;
1303 }
ccf10263
MD
1304 default:
1305 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1306 goto error;
1307 }
1308
1309 ret = LTTNG_OK;
1310
1311error:
1312 rcu_read_unlock();
1313 return ret;
1314}
1315
2f77fc4b
DG
1316/*
1317 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1318 *
1319 * The wpipe arguments is used as a notifier for the kernel thread.
1320 */
1321int cmd_enable_channel(struct ltt_session *session,
7972aab2 1322 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
2f77fc4b
DG
1323{
1324 int ret;
1325 struct ltt_ust_session *usess = session->ust_session;
1326 struct lttng_ht *chan_ht;
1f345e94 1327 size_t len;
2f77fc4b
DG
1328
1329 assert(session);
1330 assert(attr);
7972aab2 1331 assert(domain);
2f77fc4b 1332
f5436bfc 1333 len = lttng_strnlen(attr->name, sizeof(attr->name));
1f345e94
PP
1334
1335 /* Validate channel name */
1336 if (attr->name[0] == '.' ||
1337 memchr(attr->name, '/', len) != NULL) {
1338 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1339 goto end;
1340 }
1341
2f77fc4b
DG
1342 DBG("Enabling channel %s for session %s", attr->name, session->name);
1343
03b4fdcf
DG
1344 rcu_read_lock();
1345
ecc48a90
JD
1346 /*
1347 * Don't try to enable a channel if the session has been started at
1348 * some point in time before. The tracer does not allow it.
1349 */
8382cf6f 1350 if (session->has_been_started) {
ecc48a90
JD
1351 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1352 goto error;
1353 }
1354
1355 /*
1356 * If the session is a live session, remove the switch timer, the
1357 * live timer does the same thing but sends also synchronisation
1358 * beacons for inactive streams.
1359 */
1360 if (session->live_timer > 0) {
1361 attr->attr.live_timer_interval = session->live_timer;
1362 attr->attr.switch_timer_interval = 0;
1363 }
1364
6e21424e
JR
1365 /* Check for feature support */
1366 switch (domain->type) {
1367 case LTTNG_DOMAIN_KERNEL:
1368 {
1369 if (kernel_supports_ring_buffer_snapshot_sample_positions(kernel_tracer_fd) != 1) {
1370 /* Sampling position of buffer is not supported */
1371 WARN("Kernel tracer does not support buffer monitoring. "
1372 "Setting the monitor interval timer to 0 "
1373 "(disabled) for channel '%s' of session '%s'",
1374 attr-> name, session->name);
1375 lttng_channel_set_monitor_timer_interval(attr, 0);
1376 }
1377 break;
1378 }
1379 case LTTNG_DOMAIN_UST:
1380 case LTTNG_DOMAIN_JUL:
1381 case LTTNG_DOMAIN_LOG4J:
1382 case LTTNG_DOMAIN_PYTHON:
1383 break;
1384 default:
1385 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1386 goto error;
1387 }
1388
7972aab2 1389 switch (domain->type) {
2f77fc4b
DG
1390 case LTTNG_DOMAIN_KERNEL:
1391 {
1392 struct ltt_kernel_channel *kchan;
1393
2f77fc4b
DG
1394 kchan = trace_kernel_get_channel_by_name(attr->name,
1395 session->kernel_session);
1396 if (kchan == NULL) {
1397 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
85076754
MD
1398 if (attr->name[0] != '\0') {
1399 session->kernel_session->has_non_default_channel = 1;
1400 }
2f77fc4b
DG
1401 } else {
1402 ret = channel_kernel_enable(session->kernel_session, kchan);
1403 }
1404
f73fabfd 1405 if (ret != LTTNG_OK) {
2f77fc4b
DG
1406 goto error;
1407 }
1408
784303b0 1409 kernel_wait_quiescent(kernel_tracer_fd);
2f77fc4b
DG
1410 break;
1411 }
1412 case LTTNG_DOMAIN_UST:
9232818f
JG
1413 case LTTNG_DOMAIN_JUL:
1414 case LTTNG_DOMAIN_LOG4J:
1415 case LTTNG_DOMAIN_PYTHON:
2f77fc4b
DG
1416 {
1417 struct ltt_ust_channel *uchan;
1418
9232818f
JG
1419 /*
1420 * FIXME
1421 *
1422 * Current agent implementation limitations force us to allow
1423 * only one channel at once in "agent" subdomains. Each
1424 * subdomain has a default channel name which must be strictly
1425 * adhered to.
1426 */
1427 if (domain->type == LTTNG_DOMAIN_JUL) {
1428 if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME,
1429 LTTNG_SYMBOL_NAME_LEN)) {
1430 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1431 goto error;
1432 }
1433 } else if (domain->type == LTTNG_DOMAIN_LOG4J) {
1434 if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME,
1435 LTTNG_SYMBOL_NAME_LEN)) {
1436 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1437 goto error;
1438 }
1439 } else if (domain->type == LTTNG_DOMAIN_PYTHON) {
1440 if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME,
1441 LTTNG_SYMBOL_NAME_LEN)) {
1442 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1443 goto error;
1444 }
1445 }
1446
2f77fc4b
DG
1447 chan_ht = usess->domain_global.channels;
1448
1449 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1450 if (uchan == NULL) {
7972aab2 1451 ret = channel_ust_create(usess, attr, domain->buf_type);
85076754
MD
1452 if (attr->name[0] != '\0') {
1453 usess->has_non_default_channel = 1;
1454 }
2f77fc4b 1455 } else {
7972aab2 1456 ret = channel_ust_enable(usess, uchan);
2f77fc4b
DG
1457 }
1458 break;
1459 }
2f77fc4b 1460 default:
f73fabfd 1461 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1462 goto error;
1463 }
1464
1465error:
2223c96f 1466 rcu_read_unlock();
1f345e94 1467end:
2f77fc4b
DG
1468 return ret;
1469}
1470
2f77fc4b
DG
1471/*
1472 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1473 */
56a37563
JG
1474int cmd_disable_event(struct ltt_session *session,
1475 enum lttng_domain_type domain, char *channel_name,
6e911cad 1476 struct lttng_event *event)
2f77fc4b
DG
1477{
1478 int ret;
6e911cad
MD
1479 char *event_name;
1480
18a720cd
MD
1481 DBG("Disable event command for event \'%s\'", event->name);
1482
6e911cad
MD
1483 event_name = event->name;
1484
9b7431cf
JG
1485 /* Error out on unhandled search criteria */
1486 if (event->loglevel_type || event->loglevel != -1 || event->enabled
6e911cad 1487 || event->pid || event->filter || event->exclusion) {
7076b56e
JG
1488 ret = LTTNG_ERR_UNK;
1489 goto error;
6e911cad 1490 }
2f77fc4b 1491
2223c96f
DG
1492 rcu_read_lock();
1493
2f77fc4b
DG
1494 switch (domain) {
1495 case LTTNG_DOMAIN_KERNEL:
1496 {
1497 struct ltt_kernel_channel *kchan;
1498 struct ltt_kernel_session *ksess;
1499
1500 ksess = session->kernel_session;
1501
85076754
MD
1502 /*
1503 * If a non-default channel has been created in the
1504 * session, explicitely require that -c chan_name needs
1505 * to be provided.
1506 */
1507 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1508 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1509 goto error_unlock;
85076754
MD
1510 }
1511
2f77fc4b
DG
1512 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1513 if (kchan == NULL) {
f73fabfd 1514 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
7076b56e 1515 goto error_unlock;
2f77fc4b
DG
1516 }
1517
6e911cad
MD
1518 switch (event->type) {
1519 case LTTNG_EVENT_ALL:
9550ee81 1520 case LTTNG_EVENT_TRACEPOINT:
d0ae4ea8 1521 case LTTNG_EVENT_SYSCALL:
9550ee81
JR
1522 case LTTNG_EVENT_PROBE:
1523 case LTTNG_EVENT_FUNCTION:
1524 case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */
1525 if (event_name[0] == '\0') {
1526 ret = event_kernel_disable_event(kchan,
1527 NULL, event->type);
29c62722 1528 } else {
d0ae4ea8 1529 ret = event_kernel_disable_event(kchan,
9550ee81 1530 event_name, event->type);
29c62722 1531 }
6e911cad 1532 if (ret != LTTNG_OK) {
7076b56e 1533 goto error_unlock;
6e911cad
MD
1534 }
1535 break;
6e911cad
MD
1536 default:
1537 ret = LTTNG_ERR_UNK;
7076b56e 1538 goto error_unlock;
2f77fc4b
DG
1539 }
1540
1541 kernel_wait_quiescent(kernel_tracer_fd);
1542 break;
1543 }
1544 case LTTNG_DOMAIN_UST:
1545 {
1546 struct ltt_ust_channel *uchan;
1547 struct ltt_ust_session *usess;
1548
1549 usess = session->ust_session;
1550
7076b56e
JG
1551 if (validate_ust_event_name(event_name)) {
1552 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1553 goto error_unlock;
1554 }
1555
85076754
MD
1556 /*
1557 * If a non-default channel has been created in the
9550ee81 1558 * session, explicitly require that -c chan_name needs
85076754
MD
1559 * to be provided.
1560 */
1561 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1562 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1563 goto error_unlock;
85076754
MD
1564 }
1565
2f77fc4b
DG
1566 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1567 channel_name);
1568 if (uchan == NULL) {
f73fabfd 1569 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
7076b56e 1570 goto error_unlock;
2f77fc4b
DG
1571 }
1572
6e911cad
MD
1573 switch (event->type) {
1574 case LTTNG_EVENT_ALL:
b3639870
JR
1575 /*
1576 * An empty event name means that everything
1577 * should be disabled.
1578 */
1579 if (event->name[0] == '\0') {
1580 ret = event_ust_disable_all_tracepoints(usess, uchan);
77d536b2
JR
1581 } else {
1582 ret = event_ust_disable_tracepoint(usess, uchan,
1583 event_name);
1584 }
6e911cad 1585 if (ret != LTTNG_OK) {
7076b56e 1586 goto error_unlock;
6e911cad
MD
1587 }
1588 break;
1589 default:
1590 ret = LTTNG_ERR_UNK;
7076b56e 1591 goto error_unlock;
2f77fc4b
DG
1592 }
1593
1594 DBG3("Disable UST event %s in channel %s completed", event_name,
1595 channel_name);
1596 break;
1597 }
5cdb6027 1598 case LTTNG_DOMAIN_LOG4J:
f20baf8e 1599 case LTTNG_DOMAIN_JUL:
0e115563 1600 case LTTNG_DOMAIN_PYTHON:
f20baf8e 1601 {
fefd409b 1602 struct agent *agt;
f20baf8e
DG
1603 struct ltt_ust_session *usess = session->ust_session;
1604
1605 assert(usess);
1606
6e911cad
MD
1607 switch (event->type) {
1608 case LTTNG_EVENT_ALL:
1609 break;
1610 default:
1611 ret = LTTNG_ERR_UNK;
7076b56e 1612 goto error_unlock;
6e911cad
MD
1613 }
1614
5cdb6027 1615 agt = trace_ust_find_agent(usess, domain);
fefd409b
DG
1616 if (!agt) {
1617 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
7076b56e 1618 goto error_unlock;
fefd409b 1619 }
b3639870
JR
1620 /*
1621 * An empty event name means that everything
1622 * should be disabled.
1623 */
1624 if (event->name[0] == '\0') {
18a720cd
MD
1625 ret = event_agent_disable_all(usess, agt);
1626 } else {
1627 ret = event_agent_disable(usess, agt, event_name);
1628 }
f20baf8e 1629 if (ret != LTTNG_OK) {
7076b56e 1630 goto error_unlock;
f20baf8e
DG
1631 }
1632
1633 break;
1634 }
2f77fc4b 1635 default:
f73fabfd 1636 ret = LTTNG_ERR_UND;
7076b56e 1637 goto error_unlock;
2f77fc4b
DG
1638 }
1639
f73fabfd 1640 ret = LTTNG_OK;
2f77fc4b 1641
7076b56e 1642error_unlock:
2223c96f 1643 rcu_read_unlock();
7076b56e 1644error:
2f77fc4b
DG
1645 return ret;
1646}
1647
2f77fc4b
DG
1648/*
1649 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1650 */
56a37563 1651int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain,
601d5acf 1652 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
2f77fc4b 1653{
d5979e4a 1654 int ret, chan_kern_created = 0, chan_ust_created = 0;
bdf64013
JG
1655 char *app_ctx_provider_name = NULL, *app_ctx_name = NULL;
1656
1657 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
1658 app_ctx_provider_name = ctx->u.app_ctx.provider_name;
1659 app_ctx_name = ctx->u.app_ctx.ctx_name;
1660 }
2f77fc4b
DG
1661
1662 switch (domain) {
1663 case LTTNG_DOMAIN_KERNEL:
979e618e
DG
1664 assert(session->kernel_session);
1665
1666 if (session->kernel_session->channel_count == 0) {
1667 /* Create default channel */
1668 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1669 if (ret != LTTNG_OK) {
1670 goto error;
1671 }
d5979e4a 1672 chan_kern_created = 1;
979e618e 1673 }
2f77fc4b 1674 /* Add kernel context to kernel tracer */
601d5acf 1675 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
f73fabfd 1676 if (ret != LTTNG_OK) {
2f77fc4b
DG
1677 goto error;
1678 }
1679 break;
bdf64013
JG
1680 case LTTNG_DOMAIN_JUL:
1681 case LTTNG_DOMAIN_LOG4J:
1682 {
1683 /*
1684 * Validate channel name.
1685 * If no channel name is given and the domain is JUL or LOG4J,
1686 * set it to the appropriate domain-specific channel name. If
1687 * a name is provided but does not match the expexted channel
1688 * name, return an error.
1689 */
1690 if (domain == LTTNG_DOMAIN_JUL && *channel_name &&
1691 strcmp(channel_name,
1692 DEFAULT_JUL_CHANNEL_NAME)) {
1693 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1694 goto error;
1695 } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name &&
1696 strcmp(channel_name,
1697 DEFAULT_LOG4J_CHANNEL_NAME)) {
1698 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1699 goto error;
1700 }
a93b3916 1701 /* break is _not_ missing here. */
bdf64013 1702 }
2f77fc4b
DG
1703 case LTTNG_DOMAIN_UST:
1704 {
1705 struct ltt_ust_session *usess = session->ust_session;
85076754
MD
1706 unsigned int chan_count;
1707
2f77fc4b
DG
1708 assert(usess);
1709
85076754 1710 chan_count = lttng_ht_get_count(usess->domain_global.channels);
979e618e
DG
1711 if (chan_count == 0) {
1712 struct lttng_channel *attr;
1713 /* Create default channel */
0a9c6494 1714 attr = channel_new_default_attr(domain, usess->buffer_type);
979e618e
DG
1715 if (attr == NULL) {
1716 ret = LTTNG_ERR_FATAL;
1717 goto error;
1718 }
1719
7972aab2 1720 ret = channel_ust_create(usess, attr, usess->buffer_type);
979e618e
DG
1721 if (ret != LTTNG_OK) {
1722 free(attr);
1723 goto error;
1724 }
cf0bcb51 1725 channel_attr_destroy(attr);
d5979e4a 1726 chan_ust_created = 1;
979e618e
DG
1727 }
1728
601d5acf 1729 ret = context_ust_add(usess, domain, ctx, channel_name);
bdf64013
JG
1730 free(app_ctx_provider_name);
1731 free(app_ctx_name);
1732 app_ctx_name = NULL;
1733 app_ctx_provider_name = NULL;
f73fabfd 1734 if (ret != LTTNG_OK) {
2f77fc4b
DG
1735 goto error;
1736 }
1737 break;
1738 }
2f77fc4b 1739 default:
f73fabfd 1740 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1741 goto error;
1742 }
1743
bdf64013
JG
1744 ret = LTTNG_OK;
1745 goto end;
2f77fc4b
DG
1746
1747error:
d5979e4a
DG
1748 if (chan_kern_created) {
1749 struct ltt_kernel_channel *kchan =
1750 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1751 session->kernel_session);
1752 /* Created previously, this should NOT fail. */
1753 assert(kchan);
1754 kernel_destroy_channel(kchan);
1755 }
1756
1757 if (chan_ust_created) {
1758 struct ltt_ust_channel *uchan =
1759 trace_ust_find_channel_by_name(
1760 session->ust_session->domain_global.channels,
1761 DEFAULT_CHANNEL_NAME);
1762 /* Created previously, this should NOT fail. */
1763 assert(uchan);
1764 /* Remove from the channel list of the session. */
1765 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1766 uchan);
1767 trace_ust_destroy_channel(uchan);
1768 }
bdf64013
JG
1769end:
1770 free(app_ctx_provider_name);
1771 free(app_ctx_name);
2f77fc4b
DG
1772 return ret;
1773}
1774
dac8e046
JG
1775static inline bool name_starts_with(const char *name, const char *prefix)
1776{
1777 const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
1778
1779 return !strncmp(name, prefix, max_cmp_len);
1780}
1781
1782/* Perform userspace-specific event name validation */
1783static int validate_ust_event_name(const char *name)
1784{
1785 int ret = 0;
1786
1787 if (!name) {
1788 ret = -1;
1789 goto end;
1790 }
1791
1792 /*
1793 * Check name against all internal UST event component namespaces used
1794 * by the agents.
1795 */
1796 if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) ||
1797 name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) ||
1798 name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) {
1799 ret = -1;
1800 }
1801
1802end:
1803 return ret;
1804}
88f06f15 1805
2f77fc4b 1806/*
88f06f15
JG
1807 * Internal version of cmd_enable_event() with a supplemental
1808 * "internal_event" flag which is used to enable internal events which should
1809 * be hidden from clients. Such events are used in the agent implementation to
1810 * enable the events through which all "agent" events are funeled.
2f77fc4b 1811 */
88f06f15
JG
1812static int _cmd_enable_event(struct ltt_session *session,
1813 struct lttng_domain *domain,
025faf73 1814 char *channel_name, struct lttng_event *event,
6b453b5e 1815 char *filter_expression,
db8f1377
JI
1816 struct lttng_filter_bytecode *filter,
1817 struct lttng_event_exclusion *exclusion,
88f06f15 1818 int wpipe, bool internal_event)
2f77fc4b 1819{
9f449915 1820 int ret = 0, channel_created = 0;
cfedea03 1821 struct lttng_channel *attr = NULL;
2f77fc4b
DG
1822
1823 assert(session);
1824 assert(event);
1825 assert(channel_name);
1826
2a385866
JG
1827 /* If we have a filter, we must have its filter expression */
1828 assert(!(!!filter_expression ^ !!filter));
1829
9f449915
PP
1830 /* Normalize event name as a globbing pattern */
1831 strutils_normalize_star_glob_pattern(event->name);
18a720cd 1832
9f449915
PP
1833 /* Normalize exclusion names as globbing patterns */
1834 if (exclusion) {
1835 size_t i;
f5ac4bd7 1836
9f449915
PP
1837 for (i = 0; i < exclusion->count; i++) {
1838 char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i);
1839
1840 strutils_normalize_star_glob_pattern(name);
1841 }
930a2e99
JG
1842 }
1843
9f449915
PP
1844 DBG("Enable event command for event \'%s\'", event->name);
1845
1846 rcu_read_lock();
1847
7972aab2 1848 switch (domain->type) {
2f77fc4b
DG
1849 case LTTNG_DOMAIN_KERNEL:
1850 {
1851 struct ltt_kernel_channel *kchan;
1852
85076754
MD
1853 /*
1854 * If a non-default channel has been created in the
1855 * session, explicitely require that -c chan_name needs
1856 * to be provided.
1857 */
1858 if (session->kernel_session->has_non_default_channel
1859 && channel_name[0] == '\0') {
1860 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1861 goto error;
1862 }
1863
2f77fc4b
DG
1864 kchan = trace_kernel_get_channel_by_name(channel_name,
1865 session->kernel_session);
1866 if (kchan == NULL) {
0a9c6494
DG
1867 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1868 LTTNG_BUFFER_GLOBAL);
2f77fc4b 1869 if (attr == NULL) {
f73fabfd 1870 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1871 goto error;
1872 }
04c17253
MD
1873 if (lttng_strncpy(attr->name, channel_name,
1874 sizeof(attr->name))) {
1875 ret = LTTNG_ERR_INVALID;
04c17253
MD
1876 goto error;
1877 }
2f77fc4b
DG
1878
1879 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1880 if (ret != LTTNG_OK) {
2f77fc4b
DG
1881 goto error;
1882 }
e5f5db7f 1883 channel_created = 1;
2f77fc4b
DG
1884 }
1885
1886 /* Get the newly created kernel channel pointer */
1887 kchan = trace_kernel_get_channel_by_name(channel_name,
1888 session->kernel_session);
1889 if (kchan == NULL) {
1890 /* This sould not happen... */
f73fabfd 1891 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1892 goto error;
1893 }
1894
6e911cad
MD
1895 switch (event->type) {
1896 case LTTNG_EVENT_ALL:
29c62722 1897 {
00a62084
MD
1898 char *filter_expression_a = NULL;
1899 struct lttng_filter_bytecode *filter_a = NULL;
1900
1901 /*
1902 * We need to duplicate filter_expression and filter,
1903 * because ownership is passed to first enable
1904 * event.
1905 */
1906 if (filter_expression) {
1907 filter_expression_a = strdup(filter_expression);
1908 if (!filter_expression_a) {
1909 ret = LTTNG_ERR_FATAL;
1910 goto error;
1911 }
1912 }
1913 if (filter) {
1914 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
1915 if (!filter_a) {
1916 free(filter_expression_a);
1917 ret = LTTNG_ERR_FATAL;
1918 goto error;
1919 }
1920 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
1921 }
29c62722 1922 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
00a62084
MD
1923 ret = event_kernel_enable_event(kchan, event,
1924 filter_expression, filter);
a969e101
MD
1925 /* We have passed ownership */
1926 filter_expression = NULL;
1927 filter = NULL;
29c62722
MD
1928 if (ret != LTTNG_OK) {
1929 if (channel_created) {
1930 /* Let's not leak a useless channel. */
1931 kernel_destroy_channel(kchan);
1932 }
00a62084
MD
1933 free(filter_expression_a);
1934 free(filter_a);
29c62722
MD
1935 goto error;
1936 }
1937 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
00a62084
MD
1938 ret = event_kernel_enable_event(kchan, event,
1939 filter_expression_a, filter_a);
60d21fa2
AB
1940 /* We have passed ownership */
1941 filter_expression_a = NULL;
1942 filter_a = NULL;
29c62722
MD
1943 if (ret != LTTNG_OK) {
1944 goto error;
1945 }
1946 break;
1947 }
6e6ef3d7
DG
1948 case LTTNG_EVENT_PROBE:
1949 case LTTNG_EVENT_FUNCTION:
1950 case LTTNG_EVENT_FUNCTION_ENTRY:
6e911cad 1951 case LTTNG_EVENT_TRACEPOINT:
00a62084
MD
1952 ret = event_kernel_enable_event(kchan, event,
1953 filter_expression, filter);
a969e101
MD
1954 /* We have passed ownership */
1955 filter_expression = NULL;
1956 filter = NULL;
6e911cad
MD
1957 if (ret != LTTNG_OK) {
1958 if (channel_created) {
1959 /* Let's not leak a useless channel. */
1960 kernel_destroy_channel(kchan);
1961 }
1962 goto error;
e5f5db7f 1963 }
6e911cad
MD
1964 break;
1965 case LTTNG_EVENT_SYSCALL:
00a62084
MD
1966 ret = event_kernel_enable_event(kchan, event,
1967 filter_expression, filter);
a969e101
MD
1968 /* We have passed ownership */
1969 filter_expression = NULL;
1970 filter = NULL;
e2b957af
MD
1971 if (ret != LTTNG_OK) {
1972 goto error;
1973 }
6e911cad
MD
1974 break;
1975 default:
1976 ret = LTTNG_ERR_UNK;
2f77fc4b
DG
1977 goto error;
1978 }
1979
1980 kernel_wait_quiescent(kernel_tracer_fd);
1981 break;
1982 }
1983 case LTTNG_DOMAIN_UST:
1984 {
1985 struct ltt_ust_channel *uchan;
1986 struct ltt_ust_session *usess = session->ust_session;
1987
1988 assert(usess);
1989
85076754
MD
1990 /*
1991 * If a non-default channel has been created in the
1992 * session, explicitely require that -c chan_name needs
1993 * to be provided.
1994 */
1995 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1996 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1997 goto error;
1998 }
1999
2f77fc4b
DG
2000 /* Get channel from global UST domain */
2001 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2002 channel_name);
2003 if (uchan == NULL) {
2004 /* Create default channel */
0a9c6494
DG
2005 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
2006 usess->buffer_type);
2f77fc4b 2007 if (attr == NULL) {
f73fabfd 2008 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2009 goto error;
2010 }
04c17253
MD
2011 if (lttng_strncpy(attr->name, channel_name,
2012 sizeof(attr->name))) {
2013 ret = LTTNG_ERR_INVALID;
04c17253
MD
2014 goto error;
2015 }
2f77fc4b
DG
2016
2017 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 2018 if (ret != LTTNG_OK) {
2f77fc4b
DG
2019 goto error;
2020 }
2f77fc4b
DG
2021
2022 /* Get the newly created channel reference back */
2023 uchan = trace_ust_find_channel_by_name(
2024 usess->domain_global.channels, channel_name);
2025 assert(uchan);
2026 }
2027
141feb8c
JG
2028 if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) {
2029 /*
2030 * Don't allow users to add UST events to channels which
2031 * are assigned to a userspace subdomain (JUL, Log4J,
2032 * Python, etc.).
2033 */
2034 ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN;
2035 goto error;
2036 }
2037
dac8e046
JG
2038 if (!internal_event) {
2039 /*
2040 * Ensure the event name is not reserved for internal
2041 * use.
2042 */
2043 ret = validate_ust_event_name(event->name);
2044 if (ret) {
2045 WARN("Userspace event name %s failed validation.",
2046 event->name ?
2047 event->name : "NULL");
2048 ret = LTTNG_ERR_INVALID_EVENT_NAME;
2049 goto error;
2050 }
2051 }
2052
2f77fc4b 2053 /* At this point, the session and channel exist on the tracer */
6b453b5e 2054 ret = event_ust_enable_tracepoint(usess, uchan, event,
88f06f15
JG
2055 filter_expression, filter, exclusion,
2056 internal_event);
49d21f93
MD
2057 /* We have passed ownership */
2058 filter_expression = NULL;
2059 filter = NULL;
2060 exclusion = NULL;
94382e15
JG
2061 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2062 goto already_enabled;
2063 } else if (ret != LTTNG_OK) {
2f77fc4b
DG
2064 goto error;
2065 }
2066 break;
2067 }
5cdb6027 2068 case LTTNG_DOMAIN_LOG4J:
f20baf8e 2069 case LTTNG_DOMAIN_JUL:
0e115563 2070 case LTTNG_DOMAIN_PYTHON:
f20baf8e 2071 {
da6c3a50 2072 const char *default_event_name, *default_chan_name;
fefd409b 2073 struct agent *agt;
f20baf8e
DG
2074 struct lttng_event uevent;
2075 struct lttng_domain tmp_dom;
2076 struct ltt_ust_session *usess = session->ust_session;
2077
2078 assert(usess);
2079
5cdb6027 2080 agt = trace_ust_find_agent(usess, domain->type);
fefd409b 2081 if (!agt) {
5cdb6027 2082 agt = agent_create(domain->type);
fefd409b 2083 if (!agt) {
e5b3c48c 2084 ret = LTTNG_ERR_NOMEM;
fefd409b
DG
2085 goto error;
2086 }
2087 agent_add(agt, usess->agents);
2088 }
2089
022d91ba 2090 /* Create the default tracepoint. */
996de3c7 2091 memset(&uevent, 0, sizeof(uevent));
f20baf8e
DG
2092 uevent.type = LTTNG_EVENT_TRACEPOINT;
2093 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
51755dc8
JG
2094 default_event_name = event_get_default_agent_ust_name(
2095 domain->type);
da6c3a50 2096 if (!default_event_name) {
e5b3c48c 2097 ret = LTTNG_ERR_FATAL;
da6c3a50 2098 goto error;
f43f95a9 2099 }
da6c3a50 2100 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
f20baf8e
DG
2101 uevent.name[sizeof(uevent.name) - 1] = '\0';
2102
2103 /*
2104 * The domain type is changed because we are about to enable the
2105 * default channel and event for the JUL domain that are hardcoded.
2106 * This happens in the UST domain.
2107 */
2108 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
2109 tmp_dom.type = LTTNG_DOMAIN_UST;
2110
0e115563
DG
2111 switch (domain->type) {
2112 case LTTNG_DOMAIN_LOG4J:
da6c3a50 2113 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
0e115563
DG
2114 break;
2115 case LTTNG_DOMAIN_JUL:
da6c3a50 2116 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
0e115563
DG
2117 break;
2118 case LTTNG_DOMAIN_PYTHON:
2119 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
2120 break;
2121 default:
e98a44b0 2122 /* The switch/case we are in makes this impossible */
0e115563 2123 assert(0);
da6c3a50
DG
2124 }
2125
971da06a 2126 {
8404118c 2127 char *filter_expression_copy = NULL;
51755dc8 2128 struct lttng_filter_bytecode *filter_copy = NULL;
971da06a
JG
2129
2130 if (filter) {
51755dc8
JG
2131 const size_t filter_size = sizeof(
2132 struct lttng_filter_bytecode)
2133 + filter->len;
2134
2135 filter_copy = zmalloc(filter_size);
971da06a 2136 if (!filter_copy) {
018096a4 2137 ret = LTTNG_ERR_NOMEM;
b742e3e2 2138 goto error;
971da06a 2139 }
51755dc8 2140 memcpy(filter_copy, filter, filter_size);
971da06a 2141
8404118c
JG
2142 filter_expression_copy =
2143 strdup(filter_expression);
2144 if (!filter_expression) {
2145 ret = LTTNG_ERR_NOMEM;
51755dc8
JG
2146 }
2147
2148 if (!filter_expression_copy || !filter_copy) {
2149 free(filter_expression_copy);
2150 free(filter_copy);
2151 goto error;
8404118c 2152 }
971da06a
JG
2153 }
2154
88f06f15 2155 ret = cmd_enable_event_internal(session, &tmp_dom,
971da06a 2156 (char *) default_chan_name,
8404118c
JG
2157 &uevent, filter_expression_copy,
2158 filter_copy, NULL, wpipe);
971da06a
JG
2159 }
2160
94382e15
JG
2161 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2162 goto already_enabled;
2163 } else if (ret != LTTNG_OK) {
f20baf8e
DG
2164 goto error;
2165 }
2166
2167 /* The wild card * means that everything should be enabled. */
2168 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
8404118c
JG
2169 ret = event_agent_enable_all(usess, agt, event, filter,
2170 filter_expression);
f20baf8e 2171 } else {
8404118c
JG
2172 ret = event_agent_enable(usess, agt, event, filter,
2173 filter_expression);
f20baf8e 2174 }
51755dc8
JG
2175 filter = NULL;
2176 filter_expression = NULL;
f20baf8e
DG
2177 if (ret != LTTNG_OK) {
2178 goto error;
2179 }
2180
2181 break;
2182 }
2f77fc4b 2183 default:
f73fabfd 2184 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2185 goto error;
2186 }
2187
f73fabfd 2188 ret = LTTNG_OK;
2f77fc4b 2189
94382e15 2190already_enabled:
2f77fc4b 2191error:
49d21f93
MD
2192 free(filter_expression);
2193 free(filter);
2194 free(exclusion);
cf0bcb51 2195 channel_attr_destroy(attr);
2223c96f 2196 rcu_read_unlock();
2f77fc4b
DG
2197 return ret;
2198}
2199
88f06f15
JG
2200/*
2201 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2202 * We own filter, exclusion, and filter_expression.
2203 */
2204int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
2205 char *channel_name, struct lttng_event *event,
2206 char *filter_expression,
2207 struct lttng_filter_bytecode *filter,
2208 struct lttng_event_exclusion *exclusion,
2209 int wpipe)
2210{
2211 return _cmd_enable_event(session, domain, channel_name, event,
2212 filter_expression, filter, exclusion, wpipe, false);
2213}
2214
2215/*
2216 * Enable an event which is internal to LTTng. An internal should
2217 * never be made visible to clients and are immune to checks such as
2218 * reserved names.
2219 */
2220static int cmd_enable_event_internal(struct ltt_session *session,
2221 struct lttng_domain *domain,
2222 char *channel_name, struct lttng_event *event,
2223 char *filter_expression,
2224 struct lttng_filter_bytecode *filter,
2225 struct lttng_event_exclusion *exclusion,
2226 int wpipe)
2227{
2228 return _cmd_enable_event(session, domain, channel_name, event,
2229 filter_expression, filter, exclusion, wpipe, true);
2230}
2231
2f77fc4b
DG
2232/*
2233 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2234 */
56a37563
JG
2235ssize_t cmd_list_tracepoints(enum lttng_domain_type domain,
2236 struct lttng_event **events)
2f77fc4b
DG
2237{
2238 int ret;
2239 ssize_t nb_events = 0;
2240
2241 switch (domain) {
2242 case LTTNG_DOMAIN_KERNEL:
2243 nb_events = kernel_list_events(kernel_tracer_fd, events);
2244 if (nb_events < 0) {
f73fabfd 2245 ret = LTTNG_ERR_KERN_LIST_FAIL;
2f77fc4b
DG
2246 goto error;
2247 }
2248 break;
2249 case LTTNG_DOMAIN_UST:
2250 nb_events = ust_app_list_events(events);
2251 if (nb_events < 0) {
f73fabfd 2252 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
2253 goto error;
2254 }
2255 break;
5cdb6027 2256 case LTTNG_DOMAIN_LOG4J:
3c6a091f 2257 case LTTNG_DOMAIN_JUL:
0e115563 2258 case LTTNG_DOMAIN_PYTHON:
f60140a1 2259 nb_events = agent_list_events(events, domain);
3c6a091f
DG
2260 if (nb_events < 0) {
2261 ret = LTTNG_ERR_UST_LIST_FAIL;
2262 goto error;
2263 }
2264 break;
2f77fc4b 2265 default:
f73fabfd 2266 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2267 goto error;
2268 }
2269
2270 return nb_events;
2271
2272error:
2273 /* Return negative value to differentiate return code */
2274 return -ret;
2275}
2276
2277/*
2278 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2279 */
56a37563 2280ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain,
2f77fc4b
DG
2281 struct lttng_event_field **fields)
2282{
2283 int ret;
2284 ssize_t nb_fields = 0;
2285
2286 switch (domain) {
2287 case LTTNG_DOMAIN_UST:
2288 nb_fields = ust_app_list_event_fields(fields);
2289 if (nb_fields < 0) {
f73fabfd 2290 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
2291 goto error;
2292 }
2293 break;
2294 case LTTNG_DOMAIN_KERNEL:
2295 default: /* fall-through */
f73fabfd 2296 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2297 goto error;
2298 }
2299
2300 return nb_fields;
2301
2302error:
2303 /* Return negative value to differentiate return code */
2304 return -ret;
2305}
2306
834978fd
DG
2307ssize_t cmd_list_syscalls(struct lttng_event **events)
2308{
2309 return syscall_table_list(events);
2310}
2311
a5dfbb9d
MD
2312/*
2313 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2314 *
2315 * Called with session lock held.
2316 */
2317ssize_t cmd_list_tracker_pids(struct ltt_session *session,
56a37563 2318 enum lttng_domain_type domain, int32_t **pids)
a5dfbb9d
MD
2319{
2320 int ret;
2321 ssize_t nr_pids = 0;
2322
2323 switch (domain) {
2324 case LTTNG_DOMAIN_KERNEL:
2325 {
2326 struct ltt_kernel_session *ksess;
2327
2328 ksess = session->kernel_session;
2329 nr_pids = kernel_list_tracker_pids(ksess, pids);
2330 if (nr_pids < 0) {
2331 ret = LTTNG_ERR_KERN_LIST_FAIL;
2332 goto error;
2333 }
2334 break;
2335 }
2336 case LTTNG_DOMAIN_UST:
2337 {
2338 struct ltt_ust_session *usess;
2339
2340 usess = session->ust_session;
2341 nr_pids = trace_ust_list_tracker_pids(usess, pids);
2342 if (nr_pids < 0) {
2343 ret = LTTNG_ERR_UST_LIST_FAIL;
2344 goto error;
2345 }
2346 break;
2347 }
2348 case LTTNG_DOMAIN_LOG4J:
2349 case LTTNG_DOMAIN_JUL:
2350 case LTTNG_DOMAIN_PYTHON:
2351 default:
2352 ret = LTTNG_ERR_UND;
2353 goto error;
2354 }
2355
2356 return nr_pids;
2357
2358error:
2359 /* Return negative value to differentiate return code */
2360 return -ret;
2361}
2362
2f77fc4b
DG
2363/*
2364 * Command LTTNG_START_TRACE processed by the client thread.
a9ad0c8f
MD
2365 *
2366 * Called with session mutex held.
2f77fc4b
DG
2367 */
2368int cmd_start_trace(struct ltt_session *session)
2369{
2370 int ret;
cde3e505 2371 unsigned long nb_chan = 0;
2f77fc4b
DG
2372 struct ltt_kernel_session *ksession;
2373 struct ltt_ust_session *usess;
2f77fc4b
DG
2374
2375 assert(session);
2376
2377 /* Ease our life a bit ;) */
2378 ksession = session->kernel_session;
2379 usess = session->ust_session;
2380
8382cf6f
DG
2381 /* Is the session already started? */
2382 if (session->active) {
f73fabfd 2383 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2384 goto error;
2385 }
2386
cde3e505
DG
2387 /*
2388 * Starting a session without channel is useless since after that it's not
2389 * possible to enable channel thus inform the client.
2390 */
2391 if (usess && usess->domain_global.channels) {
2392 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
2393 }
2394 if (ksession) {
2395 nb_chan += ksession->channel_count;
2396 }
2397 if (!nb_chan) {
2398 ret = LTTNG_ERR_NO_CHANNEL;
2399 goto error;
2400 }
2401
2f77fc4b
DG
2402 /* Kernel tracing */
2403 if (ksession != NULL) {
9b6c7ec5
DG
2404 ret = start_kernel_session(ksession, kernel_tracer_fd);
2405 if (ret != LTTNG_OK) {
2f77fc4b
DG
2406 goto error;
2407 }
2f77fc4b
DG
2408 }
2409
2410 /* Flag session that trace should start automatically */
2411 if (usess) {
14fb1ebe
DG
2412 /*
2413 * Even though the start trace might fail, flag this session active so
2414 * other application coming in are started by default.
2415 */
2416 usess->active = 1;
2f77fc4b
DG
2417
2418 ret = ust_app_start_trace_all(usess);
2419 if (ret < 0) {
f73fabfd 2420 ret = LTTNG_ERR_UST_START_FAIL;
2f77fc4b
DG
2421 goto error;
2422 }
2423 }
2424
8382cf6f
DG
2425 /* Flag this after a successful start. */
2426 session->has_been_started = 1;
2427 session->active = 1;
9b6c7ec5 2428
f73fabfd 2429 ret = LTTNG_OK;
2f77fc4b
DG
2430
2431error:
2432 return ret;
2433}
2434
2435/*
2436 * Command LTTNG_STOP_TRACE processed by the client thread.
2437 */
2438int cmd_stop_trace(struct ltt_session *session)
2439{
2440 int ret;
2441 struct ltt_kernel_channel *kchan;
2442 struct ltt_kernel_session *ksession;
2443 struct ltt_ust_session *usess;
2444
2445 assert(session);
2446
2447 /* Short cut */
2448 ksession = session->kernel_session;
2449 usess = session->ust_session;
2450
8382cf6f
DG
2451 /* Session is not active. Skip everythong and inform the client. */
2452 if (!session->active) {
f73fabfd 2453 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2f77fc4b
DG
2454 goto error;
2455 }
2456
2f77fc4b 2457 /* Kernel tracer */
14fb1ebe 2458 if (ksession && ksession->active) {
2f77fc4b
DG
2459 DBG("Stop kernel tracing");
2460
566d8970
MD
2461 ret = kernel_stop_session(ksession);
2462 if (ret < 0) {
2463 ret = LTTNG_ERR_KERN_STOP_FAIL;
2464 goto error;
2465 }
2466
2467 kernel_wait_quiescent(kernel_tracer_fd);
2468
2469 /* Flush metadata after stopping (if exists) */
2f77fc4b
DG
2470 if (ksession->metadata_stream_fd >= 0) {
2471 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2472 if (ret < 0) {
2473 ERR("Kernel metadata flush failed");
2474 }
2475 }
2476
566d8970 2477 /* Flush all buffers after stopping */
2f77fc4b
DG
2478 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2479 ret = kernel_flush_buffer(kchan);
2480 if (ret < 0) {
2481 ERR("Kernel flush buffer error");
2482 }
2483 }
2484
14fb1ebe 2485 ksession->active = 0;
2f77fc4b
DG
2486 }
2487
14fb1ebe
DG
2488 if (usess && usess->active) {
2489 /*
2490 * Even though the stop trace might fail, flag this session inactive so
2491 * other application coming in are not started by default.
2492 */
2493 usess->active = 0;
2f77fc4b
DG
2494
2495 ret = ust_app_stop_trace_all(usess);
2496 if (ret < 0) {
f73fabfd 2497 ret = LTTNG_ERR_UST_STOP_FAIL;
2f77fc4b
DG
2498 goto error;
2499 }
2500 }
2501
8382cf6f
DG
2502 /* Flag inactive after a successful stop. */
2503 session->active = 0;
f73fabfd 2504 ret = LTTNG_OK;
2f77fc4b
DG
2505
2506error:
2507 return ret;
2508}
2509
2510/*
2511 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2512 */
bda32d56
JG
2513int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2514 struct lttng_uri *uris)
2f77fc4b
DG
2515{
2516 int ret, i;
2517 struct ltt_kernel_session *ksess = session->kernel_session;
2518 struct ltt_ust_session *usess = session->ust_session;
2f77fc4b
DG
2519
2520 assert(session);
2521 assert(uris);
2522 assert(nb_uri > 0);
2523
8382cf6f
DG
2524 /* Can't set consumer URI if the session is active. */
2525 if (session->active) {
f73fabfd 2526 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2527 goto error;
2528 }
2529
bda32d56 2530 /* Set the "global" consumer URIs */
2f77fc4b 2531 for (i = 0; i < nb_uri; i++) {
bda32d56
JG
2532 ret = add_uri_to_consumer(session->consumer,
2533 &uris[i], 0, session->name);
a74934ba 2534 if (ret != LTTNG_OK) {
2f77fc4b
DG
2535 goto error;
2536 }
2f77fc4b
DG
2537 }
2538
bda32d56
JG
2539 /* Set UST session URIs */
2540 if (session->ust_session) {
2541 for (i = 0; i < nb_uri; i++) {
2542 ret = add_uri_to_consumer(
2543 session->ust_session->consumer,
2544 &uris[i], LTTNG_DOMAIN_UST,
2545 session->name);
2546 if (ret != LTTNG_OK) {
2547 goto error;
2548 }
2549 }
2550 }
2551
2552 /* Set kernel session URIs */
2553 if (session->kernel_session) {
2554 for (i = 0; i < nb_uri; i++) {
2555 ret = add_uri_to_consumer(
2556 session->kernel_session->consumer,
2557 &uris[i], LTTNG_DOMAIN_KERNEL,
2558 session->name);
2559 if (ret != LTTNG_OK) {
2560 goto error;
2561 }
2562 }
2563 }
2564
7ab70fe0
DG
2565 /*
2566 * Make sure to set the session in output mode after we set URI since a
2567 * session can be created without URL (thus flagged in no output mode).
2568 */
2569 session->output_traces = 1;
2570 if (ksess) {
2571 ksess->output_traces = 1;
bda32d56
JG
2572 }
2573
2574 if (usess) {
7ab70fe0
DG
2575 usess->output_traces = 1;
2576 }
2577
2f77fc4b 2578 /* All good! */
f73fabfd 2579 ret = LTTNG_OK;
2f77fc4b
DG
2580
2581error:
2582 return ret;
2583}
2584
2585/*
2586 * Command LTTNG_CREATE_SESSION processed by the client thread.
2587 */
2588int cmd_create_session_uri(char *name, struct lttng_uri *uris,
ecc48a90 2589 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2f77fc4b
DG
2590{
2591 int ret;
2f77fc4b
DG
2592 struct ltt_session *session;
2593
2594 assert(name);
2bba9e53 2595 assert(creds);
785d2d0d 2596
2f77fc4b
DG
2597 /*
2598 * Verify if the session already exist
2599 *
2600 * XXX: There is no need for the session lock list here since the caller
2601 * (process_client_msg) is holding it. We might want to change that so a
2602 * single command does not lock the entire session list.
2603 */
2604 session = session_find_by_name(name);
2605 if (session != NULL) {
f73fabfd 2606 ret = LTTNG_ERR_EXIST_SESS;
2f77fc4b
DG
2607 goto find_error;
2608 }
2609
2610 /* Create tracing session in the registry */
dec56f6c 2611 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2f77fc4b 2612 LTTNG_SOCK_GET_GID_CRED(creds));
f73fabfd 2613 if (ret != LTTNG_OK) {
2f77fc4b
DG
2614 goto session_error;
2615 }
2616
2617 /*
2618 * Get the newly created session pointer back
2619 *
2620 * XXX: There is no need for the session lock list here since the caller
2621 * (process_client_msg) is holding it. We might want to change that so a
2622 * single command does not lock the entire session list.
2623 */
2624 session = session_find_by_name(name);
2625 assert(session);
2626
ecc48a90 2627 session->live_timer = live_timer;
2f77fc4b
DG
2628 /* Create default consumer output for the session not yet created. */
2629 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2630 if (session->consumer == NULL) {
f73fabfd 2631 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2632 goto consumer_error;
2633 }
2634
2bba9e53 2635 if (uris) {
bda32d56 2636 ret = cmd_set_consumer_uri(session, nb_uri, uris);
2bba9e53
DG
2637 if (ret != LTTNG_OK) {
2638 goto consumer_error;
2639 }
2640 session->output_traces = 1;
2641 } else {
2642 session->output_traces = 0;
2643 DBG2("Session %s created with no output", session->name);
2f77fc4b
DG
2644 }
2645
2646 session->consumer->enabled = 1;
2647
f73fabfd 2648 return LTTNG_OK;
2f77fc4b
DG
2649
2650consumer_error:
2651 session_destroy(session);
2652session_error:
2653find_error:
2654 return ret;
2655}
2656
27babd3a
DG
2657/*
2658 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2659 */
2660int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2661 size_t nb_uri, lttng_sock_cred *creds)
2662{
2663 int ret;
2664 struct ltt_session *session;
2665 struct snapshot_output *new_output = NULL;
2666
2667 assert(name);
2668 assert(creds);
2669
2670 /*
2671 * Create session in no output mode with URIs set to NULL. The uris we've
2672 * received are for a default snapshot output if one.
2673 */
ae58b817 2674 ret = cmd_create_session_uri(name, NULL, 0, creds, 0);
27babd3a
DG
2675 if (ret != LTTNG_OK) {
2676 goto error;
2677 }
2678
2679 /* Get the newly created session pointer back. This should NEVER fail. */
2680 session = session_find_by_name(name);
2681 assert(session);
2682
2683 /* Flag session for snapshot mode. */
2684 session->snapshot_mode = 1;
2685
2686 /* Skip snapshot output creation if no URI is given. */
2687 if (nb_uri == 0) {
2688 goto end;
2689 }
2690
2691 new_output = snapshot_output_alloc();
2692 if (!new_output) {
2693 ret = LTTNG_ERR_NOMEM;
2694 goto error_snapshot_alloc;
2695 }
2696
2697 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2698 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2699 if (ret < 0) {
2700 if (ret == -ENOMEM) {
2701 ret = LTTNG_ERR_NOMEM;
2702 } else {
2703 ret = LTTNG_ERR_INVALID;
2704 }
2705 goto error_snapshot;
2706 }
2707
2708 rcu_read_lock();
2709 snapshot_add_output(&session->snapshot, new_output);
2710 rcu_read_unlock();
2711
2712end:
2713 return LTTNG_OK;
2714
2715error_snapshot:
2716 snapshot_output_destroy(new_output);
2717error_snapshot_alloc:
2718 session_destroy(session);
2719error:
2720 return ret;
2721}
2722
2f77fc4b
DG
2723/*
2724 * Command LTTNG_DESTROY_SESSION processed by the client thread.
a9ad0c8f
MD
2725 *
2726 * Called with session lock held.
2f77fc4b
DG
2727 */
2728int cmd_destroy_session(struct ltt_session *session, int wpipe)
2729{
2730 int ret;
2731 struct ltt_ust_session *usess;
2732 struct ltt_kernel_session *ksess;
2733
2734 /* Safety net */
2735 assert(session);
2736
2737 usess = session->ust_session;
2738 ksess = session->kernel_session;
2739
2740 /* Clean kernel session teardown */
2741 kernel_destroy_session(ksess);
2742
2743 /* UST session teardown */
2744 if (usess) {
2745 /* Close any relayd session */
2746 consumer_output_send_destroy_relayd(usess->consumer);
2747
2748 /* Destroy every UST application related to this session. */
2749 ret = ust_app_destroy_trace_all(usess);
2750 if (ret) {
2751 ERR("Error in ust_app_destroy_trace_all");
2752 }
2753
2754 /* Clean up the rest. */
2755 trace_ust_destroy_session(usess);
2756 }
2757
2758 /*
2759 * Must notify the kernel thread here to update it's poll set in order to
2760 * remove the channel(s)' fd just destroyed.
2761 */
2762 ret = notify_thread_pipe(wpipe);
2763 if (ret < 0) {
2764 PERROR("write kernel poll pipe");
2765 }
2766
2767 ret = session_destroy(session);
2768
2769 return ret;
2770}
2771
2f77fc4b
DG
2772/*
2773 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2774 */
56a37563
JG
2775int cmd_register_consumer(struct ltt_session *session,
2776 enum lttng_domain_type domain, const char *sock_path,
2777 struct consumer_data *cdata)
2f77fc4b
DG
2778{
2779 int ret, sock;
dd81b457 2780 struct consumer_socket *socket = NULL;
2f77fc4b
DG
2781
2782 assert(session);
2783 assert(cdata);
2784 assert(sock_path);
2785
2786 switch (domain) {
2787 case LTTNG_DOMAIN_KERNEL:
2788 {
2789 struct ltt_kernel_session *ksess = session->kernel_session;
2790
2791 assert(ksess);
2792
2793 /* Can't register a consumer if there is already one */
2794 if (ksess->consumer_fds_sent != 0) {
f73fabfd 2795 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
2796 goto error;
2797 }
2798
2799 sock = lttcomm_connect_unix_sock(sock_path);
2800 if (sock < 0) {
f73fabfd 2801 ret = LTTNG_ERR_CONNECT_FAIL;
2f77fc4b
DG
2802 goto error;
2803 }
4ce514c4 2804 cdata->cmd_sock = sock;
2f77fc4b 2805
4ce514c4 2806 socket = consumer_allocate_socket(&cdata->cmd_sock);
2f77fc4b 2807 if (socket == NULL) {
f66c074c
DG
2808 ret = close(sock);
2809 if (ret < 0) {
2810 PERROR("close register consumer");
2811 }
4ce514c4 2812 cdata->cmd_sock = -1;
f73fabfd 2813 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2814 goto error;
2815 }
2816
2817 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2818 if (socket->lock == NULL) {
2819 PERROR("zmalloc pthread mutex");
f73fabfd 2820 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2821 goto error;
2822 }
2823 pthread_mutex_init(socket->lock, NULL);
2824 socket->registered = 1;
2825
2826 rcu_read_lock();
2827 consumer_add_socket(socket, ksess->consumer);
2828 rcu_read_unlock();
2829
2830 pthread_mutex_lock(&cdata->pid_mutex);
2831 cdata->pid = -1;
2832 pthread_mutex_unlock(&cdata->pid_mutex);
2833
2834 break;
2835 }
2836 default:
2837 /* TODO: Userspace tracing */
f73fabfd 2838 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2839 goto error;
2840 }
2841
dd81b457 2842 return LTTNG_OK;
2f77fc4b
DG
2843
2844error:
dd81b457
DG
2845 if (socket) {
2846 consumer_destroy_socket(socket);
2847 }
2f77fc4b
DG
2848 return ret;
2849}
2850
2851/*
2852 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2853 */
2854ssize_t cmd_list_domains(struct ltt_session *session,
2855 struct lttng_domain **domains)
2856{
2857 int ret, index = 0;
2858 ssize_t nb_dom = 0;
fefd409b
DG
2859 struct agent *agt;
2860 struct lttng_ht_iter iter;
2f77fc4b
DG
2861
2862 if (session->kernel_session != NULL) {
2863 DBG3("Listing domains found kernel domain");
2864 nb_dom++;
2865 }
2866
2867 if (session->ust_session != NULL) {
2868 DBG3("Listing domains found UST global domain");
2869 nb_dom++;
3c6a091f 2870
e0a74f01 2871 rcu_read_lock();
fefd409b
DG
2872 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2873 agt, node.node) {
2874 if (agt->being_used) {
2875 nb_dom++;
2876 }
3c6a091f 2877 }
e0a74f01 2878 rcu_read_unlock();
2f77fc4b
DG
2879 }
2880
fa64dfb4
JG
2881 if (!nb_dom) {
2882 goto end;
2883 }
2884
2f77fc4b
DG
2885 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2886 if (*domains == NULL) {
f73fabfd 2887 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2888 goto error;
2889 }
2890
2891 if (session->kernel_session != NULL) {
2892 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
b5edb9e8
PP
2893
2894 /* Kernel session buffer type is always GLOBAL */
2895 (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL;
2896
2f77fc4b
DG
2897 index++;
2898 }
2899
2900 if (session->ust_session != NULL) {
2901 (*domains)[index].type = LTTNG_DOMAIN_UST;
88c5f0d8 2902 (*domains)[index].buf_type = session->ust_session->buffer_type;
2f77fc4b 2903 index++;
3c6a091f 2904
e0a74f01 2905 rcu_read_lock();
fefd409b
DG
2906 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2907 agt, node.node) {
2908 if (agt->being_used) {
2909 (*domains)[index].type = agt->domain;
2910 (*domains)[index].buf_type = session->ust_session->buffer_type;
2911 index++;
2912 }
3c6a091f 2913 }
e0a74f01 2914 rcu_read_unlock();
2f77fc4b 2915 }
fa64dfb4 2916end:
2f77fc4b
DG
2917 return nb_dom;
2918
2919error:
f73fabfd
DG
2920 /* Return negative value to differentiate return code */
2921 return -ret;
2f77fc4b
DG
2922}
2923
2924
2925/*
2926 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2927 */
56a37563
JG
2928ssize_t cmd_list_channels(enum lttng_domain_type domain,
2929 struct ltt_session *session, struct lttng_channel **channels)
2f77fc4b 2930{
53e367f9 2931 ssize_t nb_chan = 0, payload_size = 0, ret;
2f77fc4b
DG
2932
2933 switch (domain) {
2934 case LTTNG_DOMAIN_KERNEL:
2935 if (session->kernel_session != NULL) {
2936 nb_chan = session->kernel_session->channel_count;
2937 }
2938 DBG3("Number of kernel channels %zd", nb_chan);
c7d620a2 2939 if (nb_chan <= 0) {
53e367f9
JG
2940 ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2941 goto end;
c7d620a2 2942 }
2f77fc4b
DG
2943 break;
2944 case LTTNG_DOMAIN_UST:
2945 if (session->ust_session != NULL) {
7ffc31a2 2946 rcu_read_lock();
2f77fc4b 2947 nb_chan = lttng_ht_get_count(
7ffc31a2
JG
2948 session->ust_session->domain_global.channels);
2949 rcu_read_unlock();
2f77fc4b
DG
2950 }
2951 DBG3("Number of UST global channels %zd", nb_chan);
ade7ce52 2952 if (nb_chan < 0) {
53e367f9
JG
2953 ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND;
2954 goto end;
c7d620a2 2955 }
2f77fc4b
DG
2956 break;
2957 default:
53e367f9
JG
2958 ret = -LTTNG_ERR_UND;
2959 goto end;
2f77fc4b
DG
2960 }
2961
2962 if (nb_chan > 0) {
53e367f9 2963 const size_t channel_size = sizeof(struct lttng_channel) +
cf0bcb51
JG
2964 sizeof(struct lttng_channel_extended);
2965 struct lttng_channel_extended *channel_exts;
53e367f9
JG
2966
2967 payload_size = nb_chan * channel_size;
2968 *channels = zmalloc(payload_size);
2f77fc4b 2969 if (*channels == NULL) {
53e367f9
JG
2970 ret = -LTTNG_ERR_FATAL;
2971 goto end;
2f77fc4b
DG
2972 }
2973
53e367f9
JG
2974 channel_exts = ((void *) *channels) +
2975 (nb_chan * sizeof(struct lttng_channel));
d449df4a
MD
2976 ret = list_lttng_channels(domain, session, *channels, channel_exts);
2977 if (ret != LTTNG_OK) {
2978 free(*channels);
2979 *channels = NULL;
2980 goto end;
2981 }
53e367f9
JG
2982 } else {
2983 *channels = NULL;
2f77fc4b
DG
2984 }
2985
53e367f9
JG
2986 ret = payload_size;
2987end:
2988 return ret;
2f77fc4b
DG
2989}
2990
2991/*
2992 * Command LTTNG_LIST_EVENTS processed by the client thread.
2993 */
56a37563
JG
2994ssize_t cmd_list_events(enum lttng_domain_type domain,
2995 struct ltt_session *session, char *channel_name,
b4e3ceb9 2996 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
2997{
2998 int ret = 0;
2999 ssize_t nb_event = 0;
3000
3001 switch (domain) {
3002 case LTTNG_DOMAIN_KERNEL:
3003 if (session->kernel_session != NULL) {
3004 nb_event = list_lttng_kernel_events(channel_name,
b4e3ceb9
PP
3005 session->kernel_session, events,
3006 total_size);
2f77fc4b
DG
3007 }
3008 break;
3009 case LTTNG_DOMAIN_UST:
3010 {
3011 if (session->ust_session != NULL) {
3012 nb_event = list_lttng_ust_global_events(channel_name,
b4e3ceb9
PP
3013 &session->ust_session->domain_global, events,
3014 total_size);
2f77fc4b
DG
3015 }
3016 break;
3017 }
5cdb6027 3018 case LTTNG_DOMAIN_LOG4J:
3c6a091f 3019 case LTTNG_DOMAIN_JUL:
0e115563 3020 case LTTNG_DOMAIN_PYTHON:
3c6a091f 3021 if (session->ust_session) {
fefd409b
DG
3022 struct lttng_ht_iter iter;
3023 struct agent *agt;
3024
b11feea5 3025 rcu_read_lock();
fefd409b
DG
3026 cds_lfht_for_each_entry(session->ust_session->agents->ht,
3027 &iter.iter, agt, node.node) {
1dfd9906
JG
3028 if (agt->domain == domain) {
3029 nb_event = list_lttng_agent_events(
b4e3ceb9
PP
3030 agt, events,
3031 total_size);
1dfd9906
JG
3032 break;
3033 }
fefd409b 3034 }
b11feea5 3035 rcu_read_unlock();
3c6a091f
DG
3036 }
3037 break;
2f77fc4b 3038 default:
f73fabfd 3039 ret = LTTNG_ERR_UND;
2f77fc4b
DG
3040 goto error;
3041 }
3042
f73fabfd 3043 return nb_event;
2f77fc4b
DG
3044
3045error:
f73fabfd
DG
3046 /* Return negative value to differentiate return code */
3047 return -ret;
2f77fc4b
DG
3048}
3049
3050/*
3051 * Using the session list, filled a lttng_session array to send back to the
3052 * client for session listing.
3053 *
3054 * The session list lock MUST be acquired before calling this function. Use
3055 * session_lock_list() and session_unlock_list().
3056 */
3057void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
3058 gid_t gid)
3059{
3060 int ret;
3061 unsigned int i = 0;
3062 struct ltt_session *session;
3063 struct ltt_session_list *list = session_get_list();
3064
3065 DBG("Getting all available session for UID %d GID %d",
3066 uid, gid);
3067 /*
3068 * Iterate over session list and append data after the control struct in
3069 * the buffer.
3070 */
3071 cds_list_for_each_entry(session, &list->head, list) {
3072 /*
3073 * Only list the sessions the user can control.
3074 */
3075 if (!session_access_ok(session, uid, gid)) {
3076 continue;
3077 }
3078
3079 struct ltt_kernel_session *ksess = session->kernel_session;
3080 struct ltt_ust_session *usess = session->ust_session;
3081
3082 if (session->consumer->type == CONSUMER_DST_NET ||
3083 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
3084 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
3085 ret = build_network_session_path(sessions[i].path,
dec56f6c 3086 sizeof(sessions[i].path), session);
2f77fc4b 3087 } else {
dec56f6c 3088 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2f77fc4b
DG
3089 session->consumer->dst.trace_path);
3090 }
3091 if (ret < 0) {
3092 PERROR("snprintf session path");
3093 continue;
3094 }
3095
3096 strncpy(sessions[i].name, session->name, NAME_MAX);
3097 sessions[i].name[NAME_MAX - 1] = '\0';
8382cf6f 3098 sessions[i].enabled = session->active;
2cbf8fed 3099 sessions[i].snapshot_mode = session->snapshot_mode;
8960e9cd 3100 sessions[i].live_timer_interval = session->live_timer;
2f77fc4b
DG
3101 i++;
3102 }
3103}
3104
806e2684 3105/*
6d805429 3106 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
d3f14b8a 3107 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
806e2684 3108 */
6d805429 3109int cmd_data_pending(struct ltt_session *session)
806e2684
DG
3110{
3111 int ret;
3112 struct ltt_kernel_session *ksess = session->kernel_session;
3113 struct ltt_ust_session *usess = session->ust_session;
3114
3115 assert(session);
3116
3117 /* Session MUST be stopped to ask for data availability. */
8382cf6f 3118 if (session->active) {
806e2684
DG
3119 ret = LTTNG_ERR_SESSION_STARTED;
3120 goto error;
3a89d11a
DG
3121 } else {
3122 /*
3123 * If stopped, just make sure we've started before else the above call
3124 * will always send that there is data pending.
3125 *
3126 * The consumer assumes that when the data pending command is received,
3127 * the trace has been started before or else no output data is written
3128 * by the streams which is a condition for data pending. So, this is
3129 * *VERY* important that we don't ask the consumer before a start
3130 * trace.
3131 */
8382cf6f 3132 if (!session->has_been_started) {
3a89d11a
DG
3133 ret = 0;
3134 goto error;
3135 }
806e2684
DG
3136 }
3137
3138 if (ksess && ksess->consumer) {
6d805429
DG
3139 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
3140 if (ret == 1) {
806e2684
DG
3141 /* Data is still being extracted for the kernel. */
3142 goto error;
3143 }
3144 }
3145
3146 if (usess && usess->consumer) {
6d805429
DG
3147 ret = consumer_is_data_pending(usess->id, usess->consumer);
3148 if (ret == 1) {
806e2684
DG
3149 /* Data is still being extracted for the kernel. */
3150 goto error;
3151 }
3152 }
3153
3154 /* Data is ready to be read by a viewer */
6d805429 3155 ret = 0;
806e2684
DG
3156
3157error:
3158 return ret;
3159}
3160
6dc3064a
DG
3161/*
3162 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
3163 *
3164 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3165 */
3166int cmd_snapshot_add_output(struct ltt_session *session,
3167 struct lttng_snapshot_output *output, uint32_t *id)
3168{
3169 int ret;
3170 struct snapshot_output *new_output;
3171
3172 assert(session);
3173 assert(output);
3174
3175 DBG("Cmd snapshot add output for session %s", session->name);
3176
3177 /*
903ef685 3178 * Can't create an output if the session is not set in no-output mode.
6dc3064a
DG
3179 */
3180 if (session->output_traces) {
903ef685 3181 ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
6dc3064a
DG
3182 goto error;
3183 }
3184
3185 /* Only one output is allowed until we have the "tee" feature. */
3186 if (session->snapshot.nb_output == 1) {
3187 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
3188 goto error;
3189 }
3190
3191 new_output = snapshot_output_alloc();
3192 if (!new_output) {
3193 ret = LTTNG_ERR_NOMEM;
3194 goto error;
3195 }
3196
3197 ret = snapshot_output_init(output->max_size, output->name,
3198 output->ctrl_url, output->data_url, session->consumer, new_output,
3199 &session->snapshot);
3200 if (ret < 0) {
3201 if (ret == -ENOMEM) {
3202 ret = LTTNG_ERR_NOMEM;
3203 } else {
3204 ret = LTTNG_ERR_INVALID;
3205 }
3206 goto free_error;
3207 }
3208
6dc3064a
DG
3209 rcu_read_lock();
3210 snapshot_add_output(&session->snapshot, new_output);
3211 if (id) {
3212 *id = new_output->id;
3213 }
3214 rcu_read_unlock();
3215
3216 return LTTNG_OK;
3217
3218free_error:
3219 snapshot_output_destroy(new_output);
3220error:
3221 return ret;
3222}
3223
3224/*
3225 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
3226 *
3227 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3228 */
3229int cmd_snapshot_del_output(struct ltt_session *session,
3230 struct lttng_snapshot_output *output)
3231{
3232 int ret;
eb240553 3233 struct snapshot_output *sout = NULL;
6dc3064a
DG
3234
3235 assert(session);
3236 assert(output);
3237
6dc3064a
DG
3238 rcu_read_lock();
3239
3240 /*
d3f14b8a
MD
3241 * Permission denied to create an output if the session is not
3242 * set in no output mode.
6dc3064a
DG
3243 */
3244 if (session->output_traces) {
903ef685 3245 ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
6dc3064a
DG
3246 goto error;
3247 }
3248
eb240553
DG
3249 if (output->id) {
3250 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
3251 session->name);
3252 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
3253 } else if (*output->name != '\0') {
3254 DBG("Cmd snapshot del output name %s for session %s", output->name,
3255 session->name);
3256 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
3257 }
6dc3064a
DG
3258 if (!sout) {
3259 ret = LTTNG_ERR_INVALID;
3260 goto error;
3261 }
3262
3263 snapshot_delete_output(&session->snapshot, sout);
3264 snapshot_output_destroy(sout);
3265 ret = LTTNG_OK;
3266
3267error:
3268 rcu_read_unlock();
3269 return ret;
3270}
3271
3272/*
3273 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
3274 *
3275 * If no output is available, outputs is untouched and 0 is returned.
3276 *
3277 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
3278 */
3279ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
3280 struct lttng_snapshot_output **outputs)
3281{
3282 int ret, idx = 0;
b223ca94 3283 struct lttng_snapshot_output *list = NULL;
6dc3064a
DG
3284 struct lttng_ht_iter iter;
3285 struct snapshot_output *output;
3286
3287 assert(session);
3288 assert(outputs);
3289
3290 DBG("Cmd snapshot list outputs for session %s", session->name);
3291
3292 /*
d3f14b8a
MD
3293 * Permission denied to create an output if the session is not
3294 * set in no output mode.
6dc3064a
DG
3295 */
3296 if (session->output_traces) {
903ef685
JG
3297 ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION;
3298 goto end;
6dc3064a
DG
3299 }
3300
3301 if (session->snapshot.nb_output == 0) {
3302 ret = 0;
903ef685 3303 goto end;
6dc3064a
DG
3304 }
3305
3306 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
3307 if (!list) {
b223ca94 3308 ret = -LTTNG_ERR_NOMEM;
903ef685 3309 goto end;
6dc3064a
DG
3310 }
3311
3312 /* Copy list from session to the new list object. */
b223ca94 3313 rcu_read_lock();
6dc3064a
DG
3314 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
3315 output, node.node) {
3316 assert(output->consumer);
3317 list[idx].id = output->id;
3318 list[idx].max_size = output->max_size;
6ce22875
MD
3319 if (lttng_strncpy(list[idx].name, output->name,
3320 sizeof(list[idx].name))) {
3321 ret = -LTTNG_ERR_INVALID;
903ef685 3322 goto error;
6ce22875 3323 }
6dc3064a 3324 if (output->consumer->type == CONSUMER_DST_LOCAL) {
6ce22875
MD
3325 if (lttng_strncpy(list[idx].ctrl_url,
3326 output->consumer->dst.trace_path,
3327 sizeof(list[idx].ctrl_url))) {
3328 ret = -LTTNG_ERR_INVALID;
903ef685 3329 goto error;
6ce22875 3330 }
6dc3064a
DG
3331 } else {
3332 /* Control URI. */
3333 ret = uri_to_str_url(&output->consumer->dst.net.control,
3334 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
3335 if (ret < 0) {
b223ca94 3336 ret = -LTTNG_ERR_NOMEM;
903ef685 3337 goto error;
6dc3064a
DG
3338 }
3339
3340 /* Data URI. */
3341 ret = uri_to_str_url(&output->consumer->dst.net.data,
3342 list[idx].data_url, sizeof(list[idx].data_url));
3343 if (ret < 0) {
b223ca94 3344 ret = -LTTNG_ERR_NOMEM;
903ef685