Extend the rotation API to provide network trace archive locations
[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>
5c408ad8 39#include <lttng/rotate-internal.h>
9f449915 40#include <common/string-utils/string-utils.h>
2f77fc4b
DG
41
42#include "channel.h"
43#include "consumer.h"
44#include "event.h"
8782cc74 45#include "health-sessiond.h"
2f77fc4b
DG
46#include "kernel.h"
47#include "kernel-consumer.h"
48#include "lttng-sessiond.h"
49#include "utils.h"
834978fd 50#include "syscall.h"
7c1d2758 51#include "agent.h"
93ec662e 52#include "buffer-registry.h"
b0880ae5
JG
53#include "notification-thread.h"
54#include "notification-thread-commands.h"
5c408ad8
JD
55#include "rotate.h"
56#include "rotation-thread.h"
57#include "sessiond-timer.h"
2f77fc4b
DG
58
59#include "cmd.h"
60
61/*
62 * Used to keep a unique index for each relayd socket created where this value
63 * is associated with streams on the consumer so it can match the right relayd
d88aee68
DG
64 * to send to. It must be accessed with the relayd_net_seq_idx_lock
65 * held.
2f77fc4b 66 */
d88aee68
DG
67static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
68static uint64_t relayd_net_seq_idx;
2f77fc4b 69
7076b56e
JG
70static int validate_ust_event_name(const char *);
71static int cmd_enable_event_internal(struct ltt_session *session,
72 struct lttng_domain *domain,
73 char *channel_name, struct lttng_event *event,
74 char *filter_expression,
75 struct lttng_filter_bytecode *filter,
76 struct lttng_event_exclusion *exclusion,
77 int wpipe);
78
2f77fc4b
DG
79/*
80 * Create a session path used by list_lttng_sessions for the case that the
81 * session consumer is on the network.
82 */
83static int build_network_session_path(char *dst, size_t size,
84 struct ltt_session *session)
85{
86 int ret, kdata_port, udata_port;
87 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
88 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
89
90 assert(session);
91 assert(dst);
92
93 memset(tmp_urls, 0, sizeof(tmp_urls));
94 memset(tmp_uurl, 0, sizeof(tmp_uurl));
95
96 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
97
98 if (session->kernel_session && session->kernel_session->consumer) {
99 kuri = &session->kernel_session->consumer->dst.net.control;
100 kdata_port = session->kernel_session->consumer->dst.net.data.port;
101 }
102
103 if (session->ust_session && session->ust_session->consumer) {
104 uuri = &session->ust_session->consumer->dst.net.control;
105 udata_port = session->ust_session->consumer->dst.net.data.port;
106 }
107
108 if (uuri == NULL && kuri == NULL) {
109 uri = &session->consumer->dst.net.control;
110 kdata_port = session->consumer->dst.net.data.port;
111 } else if (kuri && uuri) {
112 ret = uri_compare(kuri, uuri);
113 if (ret) {
114 /* Not Equal */
115 uri = kuri;
116 /* Build uuri URL string */
117 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
118 if (ret < 0) {
119 goto error;
120 }
121 } else {
122 uri = kuri;
123 }
124 } else if (kuri && uuri == NULL) {
125 uri = kuri;
126 } else if (uuri && kuri == NULL) {
127 uri = uuri;
128 }
129
130 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
131 if (ret < 0) {
132 goto error;
133 }
134
9aa9f900
DG
135 /*
136 * Do we have a UST url set. If yes, this means we have both kernel and UST
137 * to print.
138 */
9d035200 139 if (*tmp_uurl != '\0') {
2f77fc4b
DG
140 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
141 tmp_urls, kdata_port, tmp_uurl, udata_port);
142 } else {
9aa9f900 143 int dport;
bef08707 144 if (kuri || (!kuri && !uuri)) {
9aa9f900
DG
145 dport = kdata_port;
146 } else {
147 /* No kernel URI, use the UST port. */
148 dport = udata_port;
149 }
150 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
2f77fc4b
DG
151 }
152
153error:
154 return ret;
155}
156
fb83fe64
JD
157/*
158 * Get run-time attributes if the session has been started (discarded events,
159 * lost packets).
160 */
161static int get_kernel_runtime_stats(struct ltt_session *session,
162 struct ltt_kernel_channel *kchan, uint64_t *discarded_events,
163 uint64_t *lost_packets)
164{
165 int ret;
166
167 if (!session->has_been_started) {
168 ret = 0;
169 *discarded_events = 0;
170 *lost_packets = 0;
171 goto end;
172 }
173
e1f3997a 174 ret = consumer_get_discarded_events(session->id, kchan->key,
fb83fe64
JD
175 session->kernel_session->consumer,
176 discarded_events);
177 if (ret < 0) {
178 goto end;
179 }
180
e1f3997a 181 ret = consumer_get_lost_packets(session->id, kchan->key,
fb83fe64
JD
182 session->kernel_session->consumer,
183 lost_packets);
184 if (ret < 0) {
185 goto end;
186 }
187
188end:
189 return ret;
190}
191
192/*
193 * Get run-time attributes if the session has been started (discarded events,
194 * lost packets).
195 */
196static int get_ust_runtime_stats(struct ltt_session *session,
197 struct ltt_ust_channel *uchan, uint64_t *discarded_events,
198 uint64_t *lost_packets)
199{
200 int ret;
201 struct ltt_ust_session *usess;
202
a91c5803
JG
203 if (!discarded_events || !lost_packets) {
204 ret = -1;
205 goto end;
206 }
207
fb83fe64 208 usess = session->ust_session;
a905c624
JG
209 assert(discarded_events);
210 assert(lost_packets);
fb83fe64
JD
211
212 if (!usess || !session->has_been_started) {
213 *discarded_events = 0;
214 *lost_packets = 0;
215 ret = 0;
216 goto end;
217 }
218
219 if (usess->buffer_type == LTTNG_BUFFER_PER_UID) {
220 ret = ust_app_uid_get_channel_runtime_stats(usess->id,
221 &usess->buffer_reg_uid_list,
222 usess->consumer, uchan->id,
223 uchan->attr.overwrite,
224 discarded_events,
225 lost_packets);
226 } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) {
227 ret = ust_app_pid_get_channel_runtime_stats(usess,
228 uchan, usess->consumer,
229 uchan->attr.overwrite,
230 discarded_events,
231 lost_packets);
232 if (ret < 0) {
233 goto end;
234 }
235 *discarded_events += uchan->per_pid_closed_app_discarded;
236 *lost_packets += uchan->per_pid_closed_app_lost;
237 } else {
238 ERR("Unsupported buffer type");
967bc289 239 assert(0);
fb83fe64
JD
240 ret = -1;
241 goto end;
242 }
243
244end:
245 return ret;
246}
247
2f77fc4b
DG
248/*
249 * Fill lttng_channel array of all channels.
250 */
d449df4a 251static ssize_t list_lttng_channels(enum lttng_domain_type domain,
fb83fe64 252 struct ltt_session *session, struct lttng_channel *channels,
cf0bcb51 253 struct lttng_channel_extended *chan_exts)
2f77fc4b 254{
d449df4a 255 int i = 0, ret = 0;
2f77fc4b
DG
256 struct ltt_kernel_channel *kchan;
257
258 DBG("Listing channels for session %s", session->name);
259
260 switch (domain) {
261 case LTTNG_DOMAIN_KERNEL:
262 /* Kernel channels */
263 if (session->kernel_session != NULL) {
264 cds_list_for_each_entry(kchan,
265 &session->kernel_session->channel_list.head, list) {
fb83fe64 266 uint64_t discarded_events, lost_packets;
cf0bcb51
JG
267 struct lttng_channel_extended *extended;
268
269 extended = (struct lttng_channel_extended *)
270 kchan->channel->attr.extended.ptr;
fb83fe64
JD
271
272 ret = get_kernel_runtime_stats(session, kchan,
273 &discarded_events, &lost_packets);
274 if (ret < 0) {
275 goto end;
276 }
2f77fc4b
DG
277 /* Copy lttng_channel struct to array */
278 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
279 channels[i].enabled = kchan->enabled;
fb83fe64
JD
280 chan_exts[i].discarded_events =
281 discarded_events;
282 chan_exts[i].lost_packets = lost_packets;
cf0bcb51
JG
283 chan_exts[i].monitor_timer_interval =
284 extended->monitor_timer_interval;
491d1539 285 chan_exts[i].blocking_timeout = 0;
2f77fc4b
DG
286 i++;
287 }
288 }
289 break;
290 case LTTNG_DOMAIN_UST:
291 {
292 struct lttng_ht_iter iter;
293 struct ltt_ust_channel *uchan;
294
e7fe706f 295 rcu_read_lock();
2f77fc4b
DG
296 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
297 &iter.iter, uchan, node.node) {
a91c5803 298 uint64_t discarded_events = 0, lost_packets = 0;
fb83fe64 299
8ee609c8
MD
300 if (lttng_strncpy(channels[i].name, uchan->name,
301 LTTNG_SYMBOL_NAME_LEN)) {
302 break;
303 }
2f77fc4b
DG
304 channels[i].attr.overwrite = uchan->attr.overwrite;
305 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
306 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
307 channels[i].attr.switch_timer_interval =
308 uchan->attr.switch_timer_interval;
309 channels[i].attr.read_timer_interval =
310 uchan->attr.read_timer_interval;
311 channels[i].enabled = uchan->enabled;
2f785fe7
DG
312 channels[i].attr.tracefile_size = uchan->tracefile_size;
313 channels[i].attr.tracefile_count = uchan->tracefile_count;
5e4435a4
JG
314
315 /*
316 * Map enum lttng_ust_output to enum lttng_event_output.
317 */
2f77fc4b
DG
318 switch (uchan->attr.output) {
319 case LTTNG_UST_MMAP:
2f77fc4b
DG
320 channels[i].attr.output = LTTNG_EVENT_MMAP;
321 break;
5e4435a4
JG
322 default:
323 /*
324 * LTTNG_UST_MMAP is the only supported UST
325 * output mode.
326 */
327 assert(0);
328 break;
2f77fc4b 329 }
fb83fe64 330
d449df4a
MD
331 chan_exts[i].monitor_timer_interval =
332 uchan->monitor_timer_interval;
491d1539
MD
333 chan_exts[i].blocking_timeout =
334 uchan->attr.u.s.blocking_timeout;
d449df4a 335
fb83fe64
JD
336 ret = get_ust_runtime_stats(session, uchan,
337 &discarded_events, &lost_packets);
338 if (ret < 0) {
339 break;
340 }
341 chan_exts[i].discarded_events = discarded_events;
342 chan_exts[i].lost_packets = lost_packets;
2f77fc4b
DG
343 i++;
344 }
e7fe706f 345 rcu_read_unlock();
2f77fc4b
DG
346 break;
347 }
348 default:
349 break;
350 }
fb83fe64
JD
351
352end:
d449df4a
MD
353 if (ret < 0) {
354 return -LTTNG_ERR_FATAL;
355 } else {
356 return LTTNG_OK;
357 }
2f77fc4b
DG
358}
359
b4e3ceb9 360static void increment_extended_len(const char *filter_expression,
795d57ce 361 struct lttng_event_exclusion *exclusion, size_t *extended_len)
b4e3ceb9
PP
362{
363 *extended_len += sizeof(struct lttcomm_event_extended_header);
364
365 if (filter_expression) {
366 *extended_len += strlen(filter_expression) + 1;
367 }
795d57ce
PP
368
369 if (exclusion) {
370 *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN;
371 }
b4e3ceb9
PP
372}
373
374static void append_extended_info(const char *filter_expression,
795d57ce 375 struct lttng_event_exclusion *exclusion, void **extended_at)
b4e3ceb9
PP
376{
377 struct lttcomm_event_extended_header extended_header;
378 size_t filter_len = 0;
795d57ce 379 size_t nb_exclusions = 0;
b4e3ceb9
PP
380
381 if (filter_expression) {
382 filter_len = strlen(filter_expression) + 1;
383 }
384
795d57ce
PP
385 if (exclusion) {
386 nb_exclusions = exclusion->count;
387 }
388
389 /* Set header fields */
b4e3ceb9 390 extended_header.filter_len = filter_len;
795d57ce
PP
391 extended_header.nb_exclusions = nb_exclusions;
392
393 /* Copy header */
b4e3ceb9
PP
394 memcpy(*extended_at, &extended_header, sizeof(extended_header));
395 *extended_at += sizeof(extended_header);
795d57ce
PP
396
397 /* Copy filter string */
398 if (filter_expression) {
399 memcpy(*extended_at, filter_expression, filter_len);
400 *extended_at += filter_len;
401 }
402
403 /* Copy exclusion names */
404 if (exclusion) {
405 size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
406
407 memcpy(*extended_at, &exclusion->names, len);
408 *extended_at += len;
409 }
b4e3ceb9
PP
410}
411
3c6a091f 412/*
022d91ba 413 * Create a list of agent domain events.
3c6a091f
DG
414 *
415 * Return number of events in list on success or else a negative value.
416 */
022d91ba 417static int list_lttng_agent_events(struct agent *agt,
b4e3ceb9 418 struct lttng_event **events, size_t *total_size)
3c6a091f
DG
419{
420 int i = 0, ret = 0;
421 unsigned int nb_event = 0;
022d91ba 422 struct agent_event *event;
3c6a091f
DG
423 struct lttng_event *tmp_events;
424 struct lttng_ht_iter iter;
b4e3ceb9
PP
425 size_t extended_len = 0;
426 void *extended_at;
3c6a091f 427
022d91ba 428 assert(agt);
3c6a091f
DG
429 assert(events);
430
022d91ba 431 DBG3("Listing agent events");
3c6a091f 432
e5bbf678 433 rcu_read_lock();
022d91ba 434 nb_event = lttng_ht_get_count(agt->events);
e5bbf678 435 rcu_read_unlock();
3c6a091f
DG
436 if (nb_event == 0) {
437 ret = nb_event;
b4e3ceb9 438 *total_size = 0;
3c6a091f
DG
439 goto error;
440 }
441
b4e3ceb9
PP
442 /* Compute required extended infos size */
443 extended_len = nb_event * sizeof(struct lttcomm_event_extended_header);
444
445 /*
446 * This is only valid because the commands which add events are
447 * processed in the same thread as the listing.
448 */
449 rcu_read_lock();
450 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
795d57ce
PP
451 increment_extended_len(event->filter_expression, NULL,
452 &extended_len);
b4e3ceb9
PP
453 }
454 rcu_read_unlock();
455
456 *total_size = nb_event * sizeof(*tmp_events) + extended_len;
457 tmp_events = zmalloc(*total_size);
3c6a091f 458 if (!tmp_events) {
022d91ba 459 PERROR("zmalloc agent events session");
3c6a091f
DG
460 ret = -LTTNG_ERR_FATAL;
461 goto error;
462 }
463
b4e3ceb9
PP
464 extended_at = ((uint8_t *) tmp_events) +
465 nb_event * sizeof(struct lttng_event);
466
3c6a091f 467 rcu_read_lock();
022d91ba 468 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
3c6a091f
DG
469 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
470 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
471 tmp_events[i].enabled = event->enabled;
2106efa0 472 tmp_events[i].loglevel = event->loglevel_value;
ff94328f 473 tmp_events[i].loglevel_type = event->loglevel_type;
3c6a091f 474 i++;
b4e3ceb9
PP
475
476 /* Append extended info */
795d57ce
PP
477 append_extended_info(event->filter_expression, NULL,
478 &extended_at);
3c6a091f
DG
479 }
480 rcu_read_unlock();
481
482 *events = tmp_events;
483 ret = nb_event;
484
485error:
486 assert(nb_event == i);
487 return ret;
488}
489
2f77fc4b
DG
490/*
491 * Create a list of ust global domain events.
492 */
493static int list_lttng_ust_global_events(char *channel_name,
b4e3ceb9
PP
494 struct ltt_ust_domain_global *ust_global,
495 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
496{
497 int i = 0, ret = 0;
498 unsigned int nb_event = 0;
499 struct lttng_ht_iter iter;
500 struct lttng_ht_node_str *node;
501 struct ltt_ust_channel *uchan;
502 struct ltt_ust_event *uevent;
503 struct lttng_event *tmp;
b4e3ceb9
PP
504 size_t extended_len = 0;
505 void *extended_at;
2f77fc4b
DG
506
507 DBG("Listing UST global events for channel %s", channel_name);
508
509 rcu_read_lock();
510
511 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
512 node = lttng_ht_iter_get_node_str(&iter);
513 if (node == NULL) {
f73fabfd 514 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
d31d3e8c 515 goto end;
2f77fc4b
DG
516 }
517
518 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
519
3c442be3 520 nb_event = lttng_ht_get_count(uchan->events);
2f77fc4b
DG
521 if (nb_event == 0) {
522 ret = nb_event;
b4e3ceb9 523 *total_size = 0;
d31d3e8c 524 goto end;
2f77fc4b
DG
525 }
526
527 DBG3("Listing UST global %d events", nb_event);
528
b4e3ceb9
PP
529 /* Compute required extended infos size */
530 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
531 if (uevent->internal) {
532 nb_event--;
533 continue;
534 }
535
536 increment_extended_len(uevent->filter_expression,
795d57ce 537 uevent->exclusion, &extended_len);
b4e3ceb9 538 }
d31d3e8c
PP
539 if (nb_event == 0) {
540 /* All events are internal, skip. */
541 ret = 0;
542 *total_size = 0;
543 goto end;
544 }
b4e3ceb9
PP
545
546 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
547 tmp = zmalloc(*total_size);
2f77fc4b 548 if (tmp == NULL) {
b12c38df
JG
549 ret = -LTTNG_ERR_FATAL;
550 goto end;
2f77fc4b
DG
551 }
552
b4e3ceb9
PP
553 extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event);
554
2f77fc4b 555 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
3c442be3
JG
556 if (uevent->internal) {
557 /* This event should remain hidden from clients */
3c442be3
JG
558 continue;
559 }
2f77fc4b
DG
560 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
561 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
562 tmp[i].enabled = uevent->enabled;
563
564 switch (uevent->attr.instrumentation) {
565 case LTTNG_UST_TRACEPOINT:
566 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
567 break;
568 case LTTNG_UST_PROBE:
569 tmp[i].type = LTTNG_EVENT_PROBE;
570 break;
571 case LTTNG_UST_FUNCTION:
572 tmp[i].type = LTTNG_EVENT_FUNCTION;
573 break;
574 }
575
576 tmp[i].loglevel = uevent->attr.loglevel;
577 switch (uevent->attr.loglevel_type) {
578 case LTTNG_UST_LOGLEVEL_ALL:
579 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
580 break;
581 case LTTNG_UST_LOGLEVEL_RANGE:
582 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
583 break;
584 case LTTNG_UST_LOGLEVEL_SINGLE:
585 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
586 break;
587 }
588 if (uevent->filter) {
589 tmp[i].filter = 1;
590 }
4634f12e
JI
591 if (uevent->exclusion) {
592 tmp[i].exclusion = 1;
593 }
2f77fc4b 594 i++;
b4e3ceb9
PP
595
596 /* Append extended info */
795d57ce
PP
597 append_extended_info(uevent->filter_expression,
598 uevent->exclusion, &extended_at);
2f77fc4b
DG
599 }
600
601 ret = nb_event;
602 *events = tmp;
d31d3e8c 603end:
2f77fc4b
DG
604 rcu_read_unlock();
605 return ret;
606}
607
608/*
609 * Fill lttng_event array of all kernel events in the channel.
610 */
611static int list_lttng_kernel_events(char *channel_name,
b4e3ceb9
PP
612 struct ltt_kernel_session *kernel_session,
613 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
614{
615 int i = 0, ret;
616 unsigned int nb_event;
617 struct ltt_kernel_event *event;
618 struct ltt_kernel_channel *kchan;
b4e3ceb9
PP
619 size_t extended_len = 0;
620 void *extended_at;
2f77fc4b
DG
621
622 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
623 if (kchan == NULL) {
f73fabfd 624 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG
625 goto error;
626 }
627
628 nb_event = kchan->event_count;
629
630 DBG("Listing events for channel %s", kchan->channel->name);
631
632 if (nb_event == 0) {
b4e3ceb9 633 *total_size = 0;
834978fd 634 *events = NULL;
db906c12 635 goto end;
2f77fc4b
DG
636 }
637
b4e3ceb9
PP
638 /* Compute required extended infos size */
639 cds_list_for_each_entry(event, &kchan->events_list.head, list) {
795d57ce
PP
640 increment_extended_len(event->filter_expression, NULL,
641 &extended_len);
b4e3ceb9
PP
642 }
643
644 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
645 *events = zmalloc(*total_size);
2f77fc4b 646 if (*events == NULL) {
f73fabfd 647 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
648 goto error;
649 }
650
ab4aa612 651 extended_at = ((void *) *events) +
b4e3ceb9
PP
652 nb_event * sizeof(struct lttng_event);
653
2f77fc4b
DG
654 /* Kernel channels */
655 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
656 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
657 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
658 (*events)[i].enabled = event->enabled;
00f992f2
JG
659 (*events)[i].filter =
660 (unsigned char) !!event->filter_expression;
2f77fc4b
DG
661
662 switch (event->event->instrumentation) {
663 case LTTNG_KERNEL_TRACEPOINT:
664 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
665 break;
2f77fc4b 666 case LTTNG_KERNEL_KRETPROBE:
1896972b
DG
667 (*events)[i].type = LTTNG_EVENT_FUNCTION;
668 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
669 sizeof(struct lttng_kernel_kprobe));
670 break;
671 case LTTNG_KERNEL_KPROBE:
2f77fc4b
DG
672 (*events)[i].type = LTTNG_EVENT_PROBE;
673 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
674 sizeof(struct lttng_kernel_kprobe));
675 break;
676 case LTTNG_KERNEL_FUNCTION:
677 (*events)[i].type = LTTNG_EVENT_FUNCTION;
678 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
679 sizeof(struct lttng_kernel_function));
680 break;
681 case LTTNG_KERNEL_NOOP:
682 (*events)[i].type = LTTNG_EVENT_NOOP;
683 break;
684 case LTTNG_KERNEL_SYSCALL:
685 (*events)[i].type = LTTNG_EVENT_SYSCALL;
686 break;
687 case LTTNG_KERNEL_ALL:
688 assert(0);
689 break;
690 }
691 i++;
b4e3ceb9
PP
692
693 /* Append extended info */
795d57ce
PP
694 append_extended_info(event->filter_expression, NULL,
695 &extended_at);
2f77fc4b
DG
696 }
697
db906c12 698end:
2f77fc4b
DG
699 return nb_event;
700
701error:
f73fabfd
DG
702 /* Negate the error code to differentiate the size from an error */
703 return -ret;
2f77fc4b
DG
704}
705
706/*
707 * Add URI so the consumer output object. Set the correct path depending on the
708 * domain adding the default trace directory.
709 */
710static int add_uri_to_consumer(struct consumer_output *consumer,
56a37563
JG
711 struct lttng_uri *uri, enum lttng_domain_type domain,
712 const char *session_name)
2f77fc4b 713{
f73fabfd 714 int ret = LTTNG_OK;
2f77fc4b
DG
715 const char *default_trace_dir;
716
717 assert(uri);
718
719 if (consumer == NULL) {
720 DBG("No consumer detected. Don't add URI. Stopping.");
f73fabfd 721 ret = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
722 goto error;
723 }
724
725 switch (domain) {
726 case LTTNG_DOMAIN_KERNEL:
727 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
728 break;
729 case LTTNG_DOMAIN_UST:
730 default_trace_dir = DEFAULT_UST_TRACE_DIR;
731 break;
732 default:
733 /*
734 * This case is possible is we try to add the URI to the global tracing
735 * session consumer object which in this case there is no subdir.
736 */
737 default_trace_dir = "";
738 }
739
740 switch (uri->dtype) {
741 case LTTNG_DST_IPV4:
742 case LTTNG_DST_IPV6:
743 DBG2("Setting network URI to consumer");
744
df75acac
DG
745 if (consumer->type == CONSUMER_DST_NET) {
746 if ((uri->stype == LTTNG_STREAM_CONTROL &&
785d2d0d
DG
747 consumer->dst.net.control_isset) ||
748 (uri->stype == LTTNG_STREAM_DATA &&
749 consumer->dst.net.data_isset)) {
df75acac
DG
750 ret = LTTNG_ERR_URL_EXIST;
751 goto error;
752 }
753 } else {
754 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
785d2d0d
DG
755 }
756
df75acac
DG
757 consumer->type = CONSUMER_DST_NET;
758
2f77fc4b
DG
759 /* Set URI into consumer output object */
760 ret = consumer_set_network_uri(consumer, uri);
761 if (ret < 0) {
a74934ba 762 ret = -ret;
2f77fc4b
DG
763 goto error;
764 } else if (ret == 1) {
765 /*
766 * URI was the same in the consumer so we do not append the subdir
767 * again so to not duplicate output dir.
768 */
f86c9f4e 769 ret = LTTNG_OK;
2f77fc4b
DG
770 goto error;
771 }
772
773 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
774 ret = consumer_set_subdir(consumer, session_name);
775 if (ret < 0) {
f73fabfd 776 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
777 goto error;
778 }
779 }
780
781 if (uri->stype == LTTNG_STREAM_CONTROL) {
782 /* On a new subdir, reappend the default trace dir. */
c30ce0b3
CB
783 strncat(consumer->subdir, default_trace_dir,
784 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2f77fc4b
DG
785 DBG3("Append domain trace name to subdir %s", consumer->subdir);
786 }
787
788 break;
789 case LTTNG_DST_PATH:
790 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
366a9222
JD
791 memset(consumer->dst.session_root_path, 0,
792 sizeof(consumer->dst.session_root_path));
9ac05d92
MD
793 /* Explicit length checks for strcpy and strcat. */
794 if (strlen(uri->dst.path) + strlen(default_trace_dir)
366a9222 795 >= sizeof(consumer->dst.session_root_path)) {
9ac05d92
MD
796 ret = LTTNG_ERR_FATAL;
797 goto error;
798 }
366a9222 799 strcpy(consumer->dst.session_root_path, uri->dst.path);
2f77fc4b 800 /* Append default trace dir */
366a9222 801 strcat(consumer->dst.session_root_path, default_trace_dir);
2f77fc4b
DG
802 /* Flag consumer as local. */
803 consumer->type = CONSUMER_DST_LOCAL;
804 break;
805 }
806
a74934ba
DG
807 ret = LTTNG_OK;
808
2f77fc4b
DG
809error:
810 return ret;
811}
812
813/*
814 * Init tracing by creating trace directory and sending fds kernel consumer.
815 */
816static int init_kernel_tracing(struct ltt_kernel_session *session)
817{
818 int ret = 0;
819 struct lttng_ht_iter iter;
820 struct consumer_socket *socket;
821
822 assert(session);
823
e7fe706f
DG
824 rcu_read_lock();
825
2f77fc4b
DG
826 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
827 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
828 socket, node.node) {
2f77fc4b 829 pthread_mutex_lock(socket->lock);
f50f23d9 830 ret = kernel_consumer_send_session(socket, session);
2f77fc4b
DG
831 pthread_mutex_unlock(socket->lock);
832 if (ret < 0) {
f73fabfd 833 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
834 goto error;
835 }
836 }
837 }
838
839error:
e7fe706f 840 rcu_read_unlock();
2f77fc4b
DG
841 return ret;
842}
843
844/*
845 * Create a socket to the relayd using the URI.
846 *
847 * On success, the relayd_sock pointer is set to the created socket.
848 * Else, it's stays untouched and a lttcomm error code is returned.
849 */
6151a90f 850static int create_connect_relayd(struct lttng_uri *uri,
b31610f2
JD
851 struct lttcomm_relayd_sock **relayd_sock,
852 struct consumer_output *consumer)
2f77fc4b
DG
853{
854 int ret;
6151a90f 855 struct lttcomm_relayd_sock *rsock;
2f77fc4b 856
6151a90f
JD
857 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
858 RELAYD_VERSION_COMM_MINOR);
859 if (!rsock) {
f73fabfd 860 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
861 goto error;
862 }
863
ffe60014
DG
864 /*
865 * Connect to relayd so we can proceed with a session creation. This call
866 * can possibly block for an arbitrary amount of time to set the health
867 * state to be in poll execution.
868 */
869 health_poll_entry();
6151a90f 870 ret = relayd_connect(rsock);
ffe60014 871 health_poll_exit();
2f77fc4b
DG
872 if (ret < 0) {
873 ERR("Unable to reach lttng-relayd");
f73fabfd 874 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG
875 goto free_sock;
876 }
877
878 /* Create socket for control stream. */
879 if (uri->stype == LTTNG_STREAM_CONTROL) {
880 DBG3("Creating relayd stream socket from URI");
881
882 /* Check relayd version */
6151a90f 883 ret = relayd_version_check(rsock);
67d5aa28
JD
884 if (ret == LTTNG_ERR_RELAYD_VERSION_FAIL) {
885 goto close_sock;
886 } else if (ret < 0) {
887 ERR("Unable to reach lttng-relayd");
888 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG
889 goto close_sock;
890 }
b31610f2
JD
891 consumer->relay_major_version = rsock->major;
892 consumer->relay_minor_version = rsock->minor;
2f77fc4b
DG
893 } else if (uri->stype == LTTNG_STREAM_DATA) {
894 DBG3("Creating relayd data socket from URI");
895 } else {
896 /* Command is not valid */
897 ERR("Relayd invalid stream type: %d", uri->stype);
f73fabfd 898 ret = LTTNG_ERR_INVALID;
2f77fc4b
DG
899 goto close_sock;
900 }
901
6151a90f 902 *relayd_sock = rsock;
2f77fc4b 903
f73fabfd 904 return LTTNG_OK;
2f77fc4b
DG
905
906close_sock:
6151a90f
JD
907 /* The returned value is not useful since we are on an error path. */
908 (void) relayd_close(rsock);
2f77fc4b 909free_sock:
6151a90f 910 free(rsock);
2f77fc4b
DG
911error:
912 return ret;
913}
914
915/*
916 * Connect to the relayd using URI and send the socket to the right consumer.
43fade62
JG
917 *
918 * The consumer socket lock must be held by the caller.
2f77fc4b 919 */
56a37563
JG
920static int send_consumer_relayd_socket(enum lttng_domain_type domain,
921 unsigned int session_id, struct lttng_uri *relayd_uri,
922 struct consumer_output *consumer,
d3e2ba59
JD
923 struct consumer_socket *consumer_sock,
924 char *session_name, char *hostname, int session_live_timer)
2f77fc4b
DG
925{
926 int ret;
6151a90f 927 struct lttcomm_relayd_sock *rsock = NULL;
2f77fc4b 928
ffe60014 929 /* Connect to relayd and make version check if uri is the control. */
b31610f2 930 ret = create_connect_relayd(relayd_uri, &rsock, consumer);
ffe60014 931 if (ret != LTTNG_OK) {
9e218353 932 goto relayd_comm_error;
ffe60014 933 }
6151a90f 934 assert(rsock);
ffe60014 935
2f77fc4b 936 /* Set the network sequence index if not set. */
d88aee68
DG
937 if (consumer->net_seq_index == (uint64_t) -1ULL) {
938 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
939 /*
940 * Increment net_seq_idx because we are about to transfer the
941 * new relayd socket to the consumer.
d88aee68 942 * Assign unique key so the consumer can match streams.
2f77fc4b 943 */
d88aee68
DG
944 consumer->net_seq_index = ++relayd_net_seq_idx;
945 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
946 }
947
2f77fc4b 948 /* Send relayd socket to consumer. */
6151a90f 949 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
d3e2ba59
JD
950 relayd_uri->stype, session_id,
951 session_name, hostname, session_live_timer);
2f77fc4b 952 if (ret < 0) {
f73fabfd 953 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
954 goto close_sock;
955 }
956
c890b720
DG
957 /* Flag that the corresponding socket was sent. */
958 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
ffe60014 959 consumer_sock->control_sock_sent = 1;
c890b720 960 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
ffe60014 961 consumer_sock->data_sock_sent = 1;
c890b720
DG
962 }
963
f73fabfd 964 ret = LTTNG_OK;
2f77fc4b
DG
965
966 /*
967 * Close socket which was dup on the consumer side. The session daemon does
968 * NOT keep track of the relayd socket(s) once transfer to the consumer.
969 */
970
971close_sock:
ffe60014
DG
972 if (ret != LTTNG_OK) {
973 /*
d9078d0c
DG
974 * The consumer output for this session should not be used anymore
975 * since the relayd connection failed thus making any tracing or/and
976 * streaming not usable.
ffe60014 977 */
d9078d0c 978 consumer->enabled = 0;
ffe60014 979 }
9e218353
JR
980 (void) relayd_close(rsock);
981 free(rsock);
982
983relayd_comm_error:
2f77fc4b
DG
984 return ret;
985}
986
987/*
988 * Send both relayd sockets to a specific consumer and domain. This is a
989 * helper function to facilitate sending the information to the consumer for a
990 * session.
43fade62
JG
991 *
992 * The consumer socket lock must be held by the caller.
2f77fc4b 993 */
56a37563
JG
994static int send_consumer_relayd_sockets(enum lttng_domain_type domain,
995 unsigned int session_id, struct consumer_output *consumer,
996 struct consumer_socket *sock, char *session_name,
997 char *hostname, int session_live_timer)
2f77fc4b 998{
dda67f6c 999 int ret = LTTNG_OK;
2f77fc4b 1000
2f77fc4b 1001 assert(consumer);
6dc3064a 1002 assert(sock);
2f77fc4b 1003
2f77fc4b 1004 /* Sending control relayd socket. */
ffe60014 1005 if (!sock->control_sock_sent) {
6dc3064a 1006 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD
1007 &consumer->dst.net.control, consumer, sock,
1008 session_name, hostname, session_live_timer);
c890b720
DG
1009 if (ret != LTTNG_OK) {
1010 goto error;
1011 }
2f77fc4b
DG
1012 }
1013
1014 /* Sending data relayd socket. */
ffe60014 1015 if (!sock->data_sock_sent) {
6dc3064a 1016 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD
1017 &consumer->dst.net.data, consumer, sock,
1018 session_name, hostname, session_live_timer);
c890b720
DG
1019 if (ret != LTTNG_OK) {
1020 goto error;
1021 }
2f77fc4b
DG
1022 }
1023
2f77fc4b
DG
1024error:
1025 return ret;
1026}
1027
1028/*
1029 * Setup relayd connections for a tracing session. First creates the socket to
1030 * the relayd and send them to the right domain consumer. Consumer type MUST be
1031 * network.
1032 */
ffe60014 1033int cmd_setup_relayd(struct ltt_session *session)
2f77fc4b 1034{
f73fabfd 1035 int ret = LTTNG_OK;
2f77fc4b
DG
1036 struct ltt_ust_session *usess;
1037 struct ltt_kernel_session *ksess;
1038 struct consumer_socket *socket;
1039 struct lttng_ht_iter iter;
1040
1041 assert(session);
1042
1043 usess = session->ust_session;
1044 ksess = session->kernel_session;
1045
785d2d0d 1046 DBG("Setting relayd for session %s", session->name);
2f77fc4b 1047
e7fe706f
DG
1048 rcu_read_lock();
1049
2f77fc4b
DG
1050 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
1051 && usess->consumer->enabled) {
1052 /* For each consumer socket, send relayd sockets */
1053 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
1054 socket, node.node) {
2f77fc4b 1055 pthread_mutex_lock(socket->lock);
6dc3064a 1056 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
d3e2ba59
JD
1057 usess->consumer, socket,
1058 session->name, session->hostname,
1059 session->live_timer);
2f77fc4b 1060 pthread_mutex_unlock(socket->lock);
f73fabfd 1061 if (ret != LTTNG_OK) {
2f77fc4b
DG
1062 goto error;
1063 }
6dc3064a
DG
1064 /* Session is now ready for network streaming. */
1065 session->net_handle = 1;
2f77fc4b 1066 }
b31610f2
JD
1067 session->consumer->relay_major_version =
1068 usess->consumer->relay_major_version;
1069 session->consumer->relay_minor_version =
1070 usess->consumer->relay_minor_version;
2f77fc4b
DG
1071 }
1072
1073 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
1074 && ksess->consumer->enabled) {
1075 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
1076 socket, node.node) {
2f77fc4b 1077 pthread_mutex_lock(socket->lock);
6dc3064a 1078 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
d3e2ba59
JD
1079 ksess->consumer, socket,
1080 session->name, session->hostname,
1081 session->live_timer);
2f77fc4b 1082 pthread_mutex_unlock(socket->lock);
f73fabfd 1083 if (ret != LTTNG_OK) {
2f77fc4b
DG
1084 goto error;
1085 }
6dc3064a
DG
1086 /* Session is now ready for network streaming. */
1087 session->net_handle = 1;
2f77fc4b 1088 }
b31610f2
JD
1089 session->consumer->relay_major_version =
1090 ksess->consumer->relay_major_version;
1091 session->consumer->relay_minor_version =
1092 ksess->consumer->relay_minor_version;
2f77fc4b
DG
1093 }
1094
1095error:
e7fe706f 1096 rcu_read_unlock();
2f77fc4b
DG
1097 return ret;
1098}
1099
9b6c7ec5
DG
1100/*
1101 * Start a kernel session by opening all necessary streams.
1102 */
1103static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
1104{
1105 int ret;
1106 struct ltt_kernel_channel *kchan;
1107
1108 /* Open kernel metadata */
07b86b52 1109 if (ksess->metadata == NULL && ksess->output_traces) {
9b6c7ec5
DG
1110 ret = kernel_open_metadata(ksess);
1111 if (ret < 0) {
1112 ret = LTTNG_ERR_KERN_META_FAIL;
1113 goto error;
1114 }
1115 }
1116
1117 /* Open kernel metadata stream */
07b86b52 1118 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
9b6c7ec5
DG
1119 ret = kernel_open_metadata_stream(ksess);
1120 if (ret < 0) {
1121 ERR("Kernel create metadata stream failed");
1122 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1123 goto error;
1124 }
1125 }
1126
1127 /* For each channel */
1128 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
1129 if (kchan->stream_count == 0) {
1130 ret = kernel_open_channel_stream(kchan);
1131 if (ret < 0) {
1132 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1133 goto error;
1134 }
1135 /* Update the stream global counter */
1136 ksess->stream_count_global += ret;
1137 }
1138 }
1139
1140 /* Setup kernel consumer socket and send fds to it */
1141 ret = init_kernel_tracing(ksess);
e43c41c5 1142 if (ret != 0) {
9b6c7ec5
DG
1143 ret = LTTNG_ERR_KERN_START_FAIL;
1144 goto error;
1145 }
1146
1147 /* This start the kernel tracing */
1148 ret = kernel_start_session(ksess);
1149 if (ret < 0) {
1150 ret = LTTNG_ERR_KERN_START_FAIL;
1151 goto error;
1152 }
1153
1154 /* Quiescent wait after starting trace */
784303b0 1155 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5 1156
14fb1ebe 1157 ksess->active = 1;
9b6c7ec5
DG
1158
1159 ret = LTTNG_OK;
1160
1161error:
1162 return ret;
1163}
1164
2f77fc4b
DG
1165/*
1166 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1167 */
56a37563
JG
1168int cmd_disable_channel(struct ltt_session *session,
1169 enum lttng_domain_type domain, char *channel_name)
2f77fc4b
DG
1170{
1171 int ret;
1172 struct ltt_ust_session *usess;
1173
1174 usess = session->ust_session;
1175
2223c96f
DG
1176 rcu_read_lock();
1177
2f77fc4b
DG
1178 switch (domain) {
1179 case LTTNG_DOMAIN_KERNEL:
1180 {
1181 ret = channel_kernel_disable(session->kernel_session,
1182 channel_name);
f73fabfd 1183 if (ret != LTTNG_OK) {
2f77fc4b
DG
1184 goto error;
1185 }
1186
1187 kernel_wait_quiescent(kernel_tracer_fd);
1188 break;
1189 }
1190 case LTTNG_DOMAIN_UST:
1191 {
1192 struct ltt_ust_channel *uchan;
1193 struct lttng_ht *chan_ht;
1194
1195 chan_ht = usess->domain_global.channels;
1196
1197 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
1198 if (uchan == NULL) {
f73fabfd 1199 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
1200 goto error;
1201 }
1202
7972aab2 1203 ret = channel_ust_disable(usess, uchan);
f73fabfd 1204 if (ret != LTTNG_OK) {
2f77fc4b
DG
1205 goto error;
1206 }
1207 break;
1208 }
2f77fc4b 1209 default:
f73fabfd 1210 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1211 goto error;
1212 }
1213
f73fabfd 1214 ret = LTTNG_OK;
2f77fc4b
DG
1215
1216error:
2223c96f 1217 rcu_read_unlock();
2f77fc4b
DG
1218 return ret;
1219}
1220
ccf10263
MD
1221/*
1222 * Command LTTNG_TRACK_PID processed by the client thread.
a9ad0c8f
MD
1223 *
1224 * Called with session lock held.
ccf10263 1225 */
56a37563
JG
1226int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain,
1227 int pid)
ccf10263
MD
1228{
1229 int ret;
1230
1231 rcu_read_lock();
1232
1233 switch (domain) {
1234 case LTTNG_DOMAIN_KERNEL:
1235 {
1236 struct ltt_kernel_session *ksess;
1237
1238 ksess = session->kernel_session;
1239
1240 ret = kernel_track_pid(ksess, pid);
1241 if (ret != LTTNG_OK) {
1242 goto error;
1243 }
1244
1245 kernel_wait_quiescent(kernel_tracer_fd);
1246 break;
1247 }
ccf10263 1248 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
1249 {
1250 struct ltt_ust_session *usess;
1251
1252 usess = session->ust_session;
1253
1254 ret = trace_ust_track_pid(usess, pid);
1255 if (ret != LTTNG_OK) {
1256 goto error;
1257 }
1258 break;
1259 }
ccf10263
MD
1260 default:
1261 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1262 goto error;
1263 }
1264
1265 ret = LTTNG_OK;
1266
1267error:
1268 rcu_read_unlock();
1269 return ret;
1270}
1271
1272/*
1273 * Command LTTNG_UNTRACK_PID processed by the client thread.
a9ad0c8f
MD
1274 *
1275 * Called with session lock held.
ccf10263 1276 */
56a37563
JG
1277int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain,
1278 int pid)
ccf10263
MD
1279{
1280 int ret;
1281
1282 rcu_read_lock();
1283
1284 switch (domain) {
1285 case LTTNG_DOMAIN_KERNEL:
1286 {
1287 struct ltt_kernel_session *ksess;
1288
1289 ksess = session->kernel_session;
1290
1291 ret = kernel_untrack_pid(ksess, pid);
1292 if (ret != LTTNG_OK) {
1293 goto error;
1294 }
1295
1296 kernel_wait_quiescent(kernel_tracer_fd);
1297 break;
1298 }
ccf10263 1299 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
1300 {
1301 struct ltt_ust_session *usess;
1302
1303 usess = session->ust_session;
1304
1305 ret = trace_ust_untrack_pid(usess, pid);
1306 if (ret != LTTNG_OK) {
1307 goto error;
1308 }
1309 break;
1310 }
ccf10263
MD
1311 default:
1312 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1313 goto error;
1314 }
1315
1316 ret = LTTNG_OK;
1317
1318error:
1319 rcu_read_unlock();
1320 return ret;
1321}
1322
2f77fc4b
DG
1323/*
1324 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1325 *
1326 * The wpipe arguments is used as a notifier for the kernel thread.
1327 */
1328int cmd_enable_channel(struct ltt_session *session,
7972aab2 1329 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
2f77fc4b
DG
1330{
1331 int ret;
1332 struct ltt_ust_session *usess = session->ust_session;
1333 struct lttng_ht *chan_ht;
1f345e94 1334 size_t len;
2f77fc4b
DG
1335
1336 assert(session);
1337 assert(attr);
7972aab2 1338 assert(domain);
2f77fc4b 1339
f5436bfc 1340 len = lttng_strnlen(attr->name, sizeof(attr->name));
1f345e94
PP
1341
1342 /* Validate channel name */
1343 if (attr->name[0] == '.' ||
1344 memchr(attr->name, '/', len) != NULL) {
1345 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1346 goto end;
1347 }
1348
2f77fc4b
DG
1349 DBG("Enabling channel %s for session %s", attr->name, session->name);
1350
03b4fdcf
DG
1351 rcu_read_lock();
1352
ecc48a90
JD
1353 /*
1354 * Don't try to enable a channel if the session has been started at
1355 * some point in time before. The tracer does not allow it.
1356 */
8382cf6f 1357 if (session->has_been_started) {
ecc48a90
JD
1358 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1359 goto error;
1360 }
1361
1362 /*
1363 * If the session is a live session, remove the switch timer, the
1364 * live timer does the same thing but sends also synchronisation
1365 * beacons for inactive streams.
1366 */
1367 if (session->live_timer > 0) {
1368 attr->attr.live_timer_interval = session->live_timer;
1369 attr->attr.switch_timer_interval = 0;
1370 }
1371
6e21424e
JR
1372 /* Check for feature support */
1373 switch (domain->type) {
1374 case LTTNG_DOMAIN_KERNEL:
1375 {
1376 if (kernel_supports_ring_buffer_snapshot_sample_positions(kernel_tracer_fd) != 1) {
1377 /* Sampling position of buffer is not supported */
1378 WARN("Kernel tracer does not support buffer monitoring. "
1379 "Setting the monitor interval timer to 0 "
1380 "(disabled) for channel '%s' of session '%s'",
1381 attr-> name, session->name);
1382 lttng_channel_set_monitor_timer_interval(attr, 0);
1383 }
1384 break;
1385 }
1386 case LTTNG_DOMAIN_UST:
1387 case LTTNG_DOMAIN_JUL:
1388 case LTTNG_DOMAIN_LOG4J:
1389 case LTTNG_DOMAIN_PYTHON:
1390 break;
1391 default:
1392 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1393 goto error;
1394 }
1395
7972aab2 1396 switch (domain->type) {
2f77fc4b
DG
1397 case LTTNG_DOMAIN_KERNEL:
1398 {
1399 struct ltt_kernel_channel *kchan;
1400
2f77fc4b
DG
1401 kchan = trace_kernel_get_channel_by_name(attr->name,
1402 session->kernel_session);
1403 if (kchan == NULL) {
1404 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
85076754
MD
1405 if (attr->name[0] != '\0') {
1406 session->kernel_session->has_non_default_channel = 1;
1407 }
2f77fc4b
DG
1408 } else {
1409 ret = channel_kernel_enable(session->kernel_session, kchan);
1410 }
1411
f73fabfd 1412 if (ret != LTTNG_OK) {
2f77fc4b
DG
1413 goto error;
1414 }
1415
784303b0 1416 kernel_wait_quiescent(kernel_tracer_fd);
2f77fc4b
DG
1417 break;
1418 }
1419 case LTTNG_DOMAIN_UST:
9232818f
JG
1420 case LTTNG_DOMAIN_JUL:
1421 case LTTNG_DOMAIN_LOG4J:
1422 case LTTNG_DOMAIN_PYTHON:
2f77fc4b
DG
1423 {
1424 struct ltt_ust_channel *uchan;
1425
9232818f
JG
1426 /*
1427 * FIXME
1428 *
1429 * Current agent implementation limitations force us to allow
1430 * only one channel at once in "agent" subdomains. Each
1431 * subdomain has a default channel name which must be strictly
1432 * adhered to.
1433 */
1434 if (domain->type == LTTNG_DOMAIN_JUL) {
1435 if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME,
1436 LTTNG_SYMBOL_NAME_LEN)) {
1437 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1438 goto error;
1439 }
1440 } else if (domain->type == LTTNG_DOMAIN_LOG4J) {
1441 if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME,
1442 LTTNG_SYMBOL_NAME_LEN)) {
1443 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1444 goto error;
1445 }
1446 } else if (domain->type == LTTNG_DOMAIN_PYTHON) {
1447 if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME,
1448 LTTNG_SYMBOL_NAME_LEN)) {
1449 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1450 goto error;
1451 }
1452 }
1453
2f77fc4b
DG
1454 chan_ht = usess->domain_global.channels;
1455
1456 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1457 if (uchan == NULL) {
7972aab2 1458 ret = channel_ust_create(usess, attr, domain->buf_type);
85076754
MD
1459 if (attr->name[0] != '\0') {
1460 usess->has_non_default_channel = 1;
1461 }
2f77fc4b 1462 } else {
7972aab2 1463 ret = channel_ust_enable(usess, uchan);
2f77fc4b
DG
1464 }
1465 break;
1466 }
2f77fc4b 1467 default:
f73fabfd 1468 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1469 goto error;
1470 }
1471
1472error:
2223c96f 1473 rcu_read_unlock();
1f345e94 1474end:
2f77fc4b
DG
1475 return ret;
1476}
1477
2f77fc4b
DG
1478/*
1479 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1480 */
56a37563
JG
1481int cmd_disable_event(struct ltt_session *session,
1482 enum lttng_domain_type domain, char *channel_name,
6e911cad 1483 struct lttng_event *event)
2f77fc4b
DG
1484{
1485 int ret;
6e911cad
MD
1486 char *event_name;
1487
18a720cd
MD
1488 DBG("Disable event command for event \'%s\'", event->name);
1489
6e911cad
MD
1490 event_name = event->name;
1491
9b7431cf
JG
1492 /* Error out on unhandled search criteria */
1493 if (event->loglevel_type || event->loglevel != -1 || event->enabled
6e911cad 1494 || event->pid || event->filter || event->exclusion) {
7076b56e
JG
1495 ret = LTTNG_ERR_UNK;
1496 goto error;
6e911cad 1497 }
2f77fc4b 1498
2223c96f
DG
1499 rcu_read_lock();
1500
2f77fc4b
DG
1501 switch (domain) {
1502 case LTTNG_DOMAIN_KERNEL:
1503 {
1504 struct ltt_kernel_channel *kchan;
1505 struct ltt_kernel_session *ksess;
1506
1507 ksess = session->kernel_session;
1508
85076754
MD
1509 /*
1510 * If a non-default channel has been created in the
1511 * session, explicitely require that -c chan_name needs
1512 * to be provided.
1513 */
1514 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1515 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1516 goto error_unlock;
85076754
MD
1517 }
1518
2f77fc4b
DG
1519 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1520 if (kchan == NULL) {
f73fabfd 1521 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
7076b56e 1522 goto error_unlock;
2f77fc4b
DG
1523 }
1524
6e911cad
MD
1525 switch (event->type) {
1526 case LTTNG_EVENT_ALL:
9550ee81 1527 case LTTNG_EVENT_TRACEPOINT:
d0ae4ea8 1528 case LTTNG_EVENT_SYSCALL:
9550ee81
JR
1529 case LTTNG_EVENT_PROBE:
1530 case LTTNG_EVENT_FUNCTION:
1531 case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */
1532 if (event_name[0] == '\0') {
1533 ret = event_kernel_disable_event(kchan,
1534 NULL, event->type);
29c62722 1535 } else {
d0ae4ea8 1536 ret = event_kernel_disable_event(kchan,
9550ee81 1537 event_name, event->type);
29c62722 1538 }
6e911cad 1539 if (ret != LTTNG_OK) {
7076b56e 1540 goto error_unlock;
6e911cad
MD
1541 }
1542 break;
6e911cad
MD
1543 default:
1544 ret = LTTNG_ERR_UNK;
7076b56e 1545 goto error_unlock;
2f77fc4b
DG
1546 }
1547
1548 kernel_wait_quiescent(kernel_tracer_fd);
1549 break;
1550 }
1551 case LTTNG_DOMAIN_UST:
1552 {
1553 struct ltt_ust_channel *uchan;
1554 struct ltt_ust_session *usess;
1555
1556 usess = session->ust_session;
1557
7076b56e
JG
1558 if (validate_ust_event_name(event_name)) {
1559 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1560 goto error_unlock;
1561 }
1562
85076754
MD
1563 /*
1564 * If a non-default channel has been created in the
9550ee81 1565 * session, explicitly require that -c chan_name needs
85076754
MD
1566 * to be provided.
1567 */
1568 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1569 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1570 goto error_unlock;
85076754
MD
1571 }
1572
2f77fc4b
DG
1573 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1574 channel_name);
1575 if (uchan == NULL) {
f73fabfd 1576 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
7076b56e 1577 goto error_unlock;
2f77fc4b
DG
1578 }
1579
6e911cad
MD
1580 switch (event->type) {
1581 case LTTNG_EVENT_ALL:
b3639870
JR
1582 /*
1583 * An empty event name means that everything
1584 * should be disabled.
1585 */
1586 if (event->name[0] == '\0') {
1587 ret = event_ust_disable_all_tracepoints(usess, uchan);
77d536b2
JR
1588 } else {
1589 ret = event_ust_disable_tracepoint(usess, uchan,
1590 event_name);
1591 }
6e911cad 1592 if (ret != LTTNG_OK) {
7076b56e 1593 goto error_unlock;
6e911cad
MD
1594 }
1595 break;
1596 default:
1597 ret = LTTNG_ERR_UNK;
7076b56e 1598 goto error_unlock;
2f77fc4b
DG
1599 }
1600
1601 DBG3("Disable UST event %s in channel %s completed", event_name,
1602 channel_name);
1603 break;
1604 }
5cdb6027 1605 case LTTNG_DOMAIN_LOG4J:
f20baf8e 1606 case LTTNG_DOMAIN_JUL:
0e115563 1607 case LTTNG_DOMAIN_PYTHON:
f20baf8e 1608 {
fefd409b 1609 struct agent *agt;
f20baf8e
DG
1610 struct ltt_ust_session *usess = session->ust_session;
1611
1612 assert(usess);
1613
6e911cad
MD
1614 switch (event->type) {
1615 case LTTNG_EVENT_ALL:
1616 break;
1617 default:
1618 ret = LTTNG_ERR_UNK;
7076b56e 1619 goto error_unlock;
6e911cad
MD
1620 }
1621
5cdb6027 1622 agt = trace_ust_find_agent(usess, domain);
fefd409b
DG
1623 if (!agt) {
1624 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
7076b56e 1625 goto error_unlock;
fefd409b 1626 }
b3639870
JR
1627 /*
1628 * An empty event name means that everything
1629 * should be disabled.
1630 */
1631 if (event->name[0] == '\0') {
18a720cd
MD
1632 ret = event_agent_disable_all(usess, agt);
1633 } else {
1634 ret = event_agent_disable(usess, agt, event_name);
1635 }
f20baf8e 1636 if (ret != LTTNG_OK) {
7076b56e 1637 goto error_unlock;
f20baf8e
DG
1638 }
1639
1640 break;
1641 }
2f77fc4b 1642 default:
f73fabfd 1643 ret = LTTNG_ERR_UND;
7076b56e 1644 goto error_unlock;
2f77fc4b
DG
1645 }
1646
f73fabfd 1647 ret = LTTNG_OK;
2f77fc4b 1648
7076b56e 1649error_unlock:
2223c96f 1650 rcu_read_unlock();
7076b56e 1651error:
2f77fc4b
DG
1652 return ret;
1653}
1654
2f77fc4b
DG
1655/*
1656 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1657 */
56a37563 1658int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain,
601d5acf 1659 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
2f77fc4b 1660{
d5979e4a 1661 int ret, chan_kern_created = 0, chan_ust_created = 0;
bdf64013
JG
1662 char *app_ctx_provider_name = NULL, *app_ctx_name = NULL;
1663
9a699f7b
JR
1664 /*
1665 * Don't try to add a context if the session has been started at
1666 * some point in time before. The tracer does not allow it and would
1667 * result in a corrupted trace.
1668 */
1669 if (session->has_been_started) {
1670 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1671 goto end;
1672 }
1673
bdf64013
JG
1674 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
1675 app_ctx_provider_name = ctx->u.app_ctx.provider_name;
1676 app_ctx_name = ctx->u.app_ctx.ctx_name;
1677 }
2f77fc4b
DG
1678
1679 switch (domain) {
1680 case LTTNG_DOMAIN_KERNEL:
979e618e
DG
1681 assert(session->kernel_session);
1682
1683 if (session->kernel_session->channel_count == 0) {
1684 /* Create default channel */
1685 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1686 if (ret != LTTNG_OK) {
1687 goto error;
1688 }
d5979e4a 1689 chan_kern_created = 1;
979e618e 1690 }
2f77fc4b 1691 /* Add kernel context to kernel tracer */
601d5acf 1692 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
f73fabfd 1693 if (ret != LTTNG_OK) {
2f77fc4b
DG
1694 goto error;
1695 }
1696 break;
bdf64013
JG
1697 case LTTNG_DOMAIN_JUL:
1698 case LTTNG_DOMAIN_LOG4J:
1699 {
1700 /*
1701 * Validate channel name.
1702 * If no channel name is given and the domain is JUL or LOG4J,
1703 * set it to the appropriate domain-specific channel name. If
1704 * a name is provided but does not match the expexted channel
1705 * name, return an error.
1706 */
1707 if (domain == LTTNG_DOMAIN_JUL && *channel_name &&
1708 strcmp(channel_name,
1709 DEFAULT_JUL_CHANNEL_NAME)) {
1710 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1711 goto error;
1712 } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name &&
1713 strcmp(channel_name,
1714 DEFAULT_LOG4J_CHANNEL_NAME)) {
1715 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1716 goto error;
1717 }
a93b3916 1718 /* break is _not_ missing here. */
bdf64013 1719 }
2f77fc4b
DG
1720 case LTTNG_DOMAIN_UST:
1721 {
1722 struct ltt_ust_session *usess = session->ust_session;
85076754
MD
1723 unsigned int chan_count;
1724
2f77fc4b
DG
1725 assert(usess);
1726
85076754 1727 chan_count = lttng_ht_get_count(usess->domain_global.channels);
979e618e
DG
1728 if (chan_count == 0) {
1729 struct lttng_channel *attr;
1730 /* Create default channel */
0a9c6494 1731 attr = channel_new_default_attr(domain, usess->buffer_type);
979e618e
DG
1732 if (attr == NULL) {
1733 ret = LTTNG_ERR_FATAL;
1734 goto error;
1735 }
1736
7972aab2 1737 ret = channel_ust_create(usess, attr, usess->buffer_type);
979e618e
DG
1738 if (ret != LTTNG_OK) {
1739 free(attr);
1740 goto error;
1741 }
cf0bcb51 1742 channel_attr_destroy(attr);
d5979e4a 1743 chan_ust_created = 1;
979e618e
DG
1744 }
1745
601d5acf 1746 ret = context_ust_add(usess, domain, ctx, channel_name);
bdf64013
JG
1747 free(app_ctx_provider_name);
1748 free(app_ctx_name);
1749 app_ctx_name = NULL;
1750 app_ctx_provider_name = NULL;
f73fabfd 1751 if (ret != LTTNG_OK) {
2f77fc4b
DG
1752 goto error;
1753 }
1754 break;
1755 }
2f77fc4b 1756 default:
f73fabfd 1757 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1758 goto error;
1759 }
1760
bdf64013
JG
1761 ret = LTTNG_OK;
1762 goto end;
2f77fc4b
DG
1763
1764error:
d5979e4a
DG
1765 if (chan_kern_created) {
1766 struct ltt_kernel_channel *kchan =
1767 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1768 session->kernel_session);
1769 /* Created previously, this should NOT fail. */
1770 assert(kchan);
1771 kernel_destroy_channel(kchan);
1772 }
1773
1774 if (chan_ust_created) {
1775 struct ltt_ust_channel *uchan =
1776 trace_ust_find_channel_by_name(
1777 session->ust_session->domain_global.channels,
1778 DEFAULT_CHANNEL_NAME);
1779 /* Created previously, this should NOT fail. */
1780 assert(uchan);
1781 /* Remove from the channel list of the session. */
1782 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1783 uchan);
1784 trace_ust_destroy_channel(uchan);
1785 }
bdf64013
JG
1786end:
1787 free(app_ctx_provider_name);
1788 free(app_ctx_name);
2f77fc4b
DG
1789 return ret;
1790}
1791
dac8e046
JG
1792static inline bool name_starts_with(const char *name, const char *prefix)
1793{
1794 const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
1795
1796 return !strncmp(name, prefix, max_cmp_len);
1797}
1798
1799/* Perform userspace-specific event name validation */
1800static int validate_ust_event_name(const char *name)
1801{
1802 int ret = 0;
1803
1804 if (!name) {
1805 ret = -1;
1806 goto end;
1807 }
1808
1809 /*
1810 * Check name against all internal UST event component namespaces used
1811 * by the agents.
1812 */
1813 if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) ||
1814 name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) ||
1815 name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) {
1816 ret = -1;
1817 }
1818
1819end:
1820 return ret;
1821}
88f06f15 1822
2f77fc4b 1823/*
88f06f15
JG
1824 * Internal version of cmd_enable_event() with a supplemental
1825 * "internal_event" flag which is used to enable internal events which should
1826 * be hidden from clients. Such events are used in the agent implementation to
1827 * enable the events through which all "agent" events are funeled.
2f77fc4b 1828 */
88f06f15
JG
1829static int _cmd_enable_event(struct ltt_session *session,
1830 struct lttng_domain *domain,
025faf73 1831 char *channel_name, struct lttng_event *event,
6b453b5e 1832 char *filter_expression,
db8f1377
JI
1833 struct lttng_filter_bytecode *filter,
1834 struct lttng_event_exclusion *exclusion,
88f06f15 1835 int wpipe, bool internal_event)
2f77fc4b 1836{
9f449915 1837 int ret = 0, channel_created = 0;
cfedea03 1838 struct lttng_channel *attr = NULL;
2f77fc4b
DG
1839
1840 assert(session);
1841 assert(event);
1842 assert(channel_name);
1843
2a385866
JG
1844 /* If we have a filter, we must have its filter expression */
1845 assert(!(!!filter_expression ^ !!filter));
1846
9f449915
PP
1847 /* Normalize event name as a globbing pattern */
1848 strutils_normalize_star_glob_pattern(event->name);
18a720cd 1849
9f449915
PP
1850 /* Normalize exclusion names as globbing patterns */
1851 if (exclusion) {
1852 size_t i;
f5ac4bd7 1853
9f449915
PP
1854 for (i = 0; i < exclusion->count; i++) {
1855 char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i);
1856
1857 strutils_normalize_star_glob_pattern(name);
1858 }
930a2e99
JG
1859 }
1860
9f449915
PP
1861 DBG("Enable event command for event \'%s\'", event->name);
1862
1863 rcu_read_lock();
1864
7972aab2 1865 switch (domain->type) {
2f77fc4b
DG
1866 case LTTNG_DOMAIN_KERNEL:
1867 {
1868 struct ltt_kernel_channel *kchan;
1869
85076754
MD
1870 /*
1871 * If a non-default channel has been created in the
1872 * session, explicitely require that -c chan_name needs
1873 * to be provided.
1874 */
1875 if (session->kernel_session->has_non_default_channel
1876 && channel_name[0] == '\0') {
1877 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1878 goto error;
1879 }
1880
2f77fc4b
DG
1881 kchan = trace_kernel_get_channel_by_name(channel_name,
1882 session->kernel_session);
1883 if (kchan == NULL) {
0a9c6494
DG
1884 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1885 LTTNG_BUFFER_GLOBAL);
2f77fc4b 1886 if (attr == NULL) {
f73fabfd 1887 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1888 goto error;
1889 }
04c17253
MD
1890 if (lttng_strncpy(attr->name, channel_name,
1891 sizeof(attr->name))) {
1892 ret = LTTNG_ERR_INVALID;
04c17253
MD
1893 goto error;
1894 }
2f77fc4b
DG
1895
1896 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1897 if (ret != LTTNG_OK) {
2f77fc4b
DG
1898 goto error;
1899 }
e5f5db7f 1900 channel_created = 1;
2f77fc4b
DG
1901 }
1902
1903 /* Get the newly created kernel channel pointer */
1904 kchan = trace_kernel_get_channel_by_name(channel_name,
1905 session->kernel_session);
1906 if (kchan == NULL) {
1907 /* This sould not happen... */
f73fabfd 1908 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1909 goto error;
1910 }
1911
6e911cad
MD
1912 switch (event->type) {
1913 case LTTNG_EVENT_ALL:
29c62722 1914 {
00a62084
MD
1915 char *filter_expression_a = NULL;
1916 struct lttng_filter_bytecode *filter_a = NULL;
1917
1918 /*
1919 * We need to duplicate filter_expression and filter,
1920 * because ownership is passed to first enable
1921 * event.
1922 */
1923 if (filter_expression) {
1924 filter_expression_a = strdup(filter_expression);
1925 if (!filter_expression_a) {
1926 ret = LTTNG_ERR_FATAL;
1927 goto error;
1928 }
1929 }
1930 if (filter) {
1931 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
1932 if (!filter_a) {
1933 free(filter_expression_a);
1934 ret = LTTNG_ERR_FATAL;
1935 goto error;
1936 }
1937 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
1938 }
29c62722 1939 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
00a62084
MD
1940 ret = event_kernel_enable_event(kchan, event,
1941 filter_expression, filter);
a969e101
MD
1942 /* We have passed ownership */
1943 filter_expression = NULL;
1944 filter = NULL;
29c62722
MD
1945 if (ret != LTTNG_OK) {
1946 if (channel_created) {
1947 /* Let's not leak a useless channel. */
1948 kernel_destroy_channel(kchan);
1949 }
00a62084
MD
1950 free(filter_expression_a);
1951 free(filter_a);
29c62722
MD
1952 goto error;
1953 }
1954 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
00a62084
MD
1955 ret = event_kernel_enable_event(kchan, event,
1956 filter_expression_a, filter_a);
60d21fa2
AB
1957 /* We have passed ownership */
1958 filter_expression_a = NULL;
1959 filter_a = NULL;
29c62722
MD
1960 if (ret != LTTNG_OK) {
1961 goto error;
1962 }
1963 break;
1964 }
6e6ef3d7
DG
1965 case LTTNG_EVENT_PROBE:
1966 case LTTNG_EVENT_FUNCTION:
1967 case LTTNG_EVENT_FUNCTION_ENTRY:
6e911cad 1968 case LTTNG_EVENT_TRACEPOINT:
00a62084
MD
1969 ret = event_kernel_enable_event(kchan, event,
1970 filter_expression, filter);
a969e101
MD
1971 /* We have passed ownership */
1972 filter_expression = NULL;
1973 filter = NULL;
6e911cad
MD
1974 if (ret != LTTNG_OK) {
1975 if (channel_created) {
1976 /* Let's not leak a useless channel. */
1977 kernel_destroy_channel(kchan);
1978 }
1979 goto error;
e5f5db7f 1980 }
6e911cad
MD
1981 break;
1982 case LTTNG_EVENT_SYSCALL:
00a62084
MD
1983 ret = event_kernel_enable_event(kchan, event,
1984 filter_expression, filter);
a969e101
MD
1985 /* We have passed ownership */
1986 filter_expression = NULL;
1987 filter = NULL;
e2b957af
MD
1988 if (ret != LTTNG_OK) {
1989 goto error;
1990 }
6e911cad
MD
1991 break;
1992 default:
1993 ret = LTTNG_ERR_UNK;
2f77fc4b
DG
1994 goto error;
1995 }
1996
1997 kernel_wait_quiescent(kernel_tracer_fd);
1998 break;
1999 }
2000 case LTTNG_DOMAIN_UST:
2001 {
2002 struct ltt_ust_channel *uchan;
2003 struct ltt_ust_session *usess = session->ust_session;
2004
2005 assert(usess);
2006
85076754
MD
2007 /*
2008 * If a non-default channel has been created in the
2009 * session, explicitely require that -c chan_name needs
2010 * to be provided.
2011 */
2012 if (usess->has_non_default_channel && channel_name[0] == '\0') {
2013 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
2014 goto error;
2015 }
2016
2f77fc4b
DG
2017 /* Get channel from global UST domain */
2018 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2019 channel_name);
2020 if (uchan == NULL) {
2021 /* Create default channel */
0a9c6494
DG
2022 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
2023 usess->buffer_type);
2f77fc4b 2024 if (attr == NULL) {
f73fabfd 2025 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2026 goto error;
2027 }
04c17253
MD
2028 if (lttng_strncpy(attr->name, channel_name,
2029 sizeof(attr->name))) {
2030 ret = LTTNG_ERR_INVALID;
04c17253
MD
2031 goto error;
2032 }
2f77fc4b
DG
2033
2034 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 2035 if (ret != LTTNG_OK) {
2f77fc4b
DG
2036 goto error;
2037 }
2f77fc4b
DG
2038
2039 /* Get the newly created channel reference back */
2040 uchan = trace_ust_find_channel_by_name(
2041 usess->domain_global.channels, channel_name);
2042 assert(uchan);
2043 }
2044
141feb8c
JG
2045 if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) {
2046 /*
2047 * Don't allow users to add UST events to channels which
2048 * are assigned to a userspace subdomain (JUL, Log4J,
2049 * Python, etc.).
2050 */
2051 ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN;
2052 goto error;
2053 }
2054
dac8e046
JG
2055 if (!internal_event) {
2056 /*
2057 * Ensure the event name is not reserved for internal
2058 * use.
2059 */
2060 ret = validate_ust_event_name(event->name);
2061 if (ret) {
2062 WARN("Userspace event name %s failed validation.",
2063 event->name ?
2064 event->name : "NULL");
2065 ret = LTTNG_ERR_INVALID_EVENT_NAME;
2066 goto error;
2067 }
2068 }
2069
2f77fc4b 2070 /* At this point, the session and channel exist on the tracer */
6b453b5e 2071 ret = event_ust_enable_tracepoint(usess, uchan, event,
88f06f15
JG
2072 filter_expression, filter, exclusion,
2073 internal_event);
49d21f93
MD
2074 /* We have passed ownership */
2075 filter_expression = NULL;
2076 filter = NULL;
2077 exclusion = NULL;
94382e15
JG
2078 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2079 goto already_enabled;
2080 } else if (ret != LTTNG_OK) {
2f77fc4b
DG
2081 goto error;
2082 }
2083 break;
2084 }
5cdb6027 2085 case LTTNG_DOMAIN_LOG4J:
f20baf8e 2086 case LTTNG_DOMAIN_JUL:
0e115563 2087 case LTTNG_DOMAIN_PYTHON:
f20baf8e 2088 {
da6c3a50 2089 const char *default_event_name, *default_chan_name;
fefd409b 2090 struct agent *agt;
f20baf8e
DG
2091 struct lttng_event uevent;
2092 struct lttng_domain tmp_dom;
2093 struct ltt_ust_session *usess = session->ust_session;
2094
2095 assert(usess);
2096
5cdb6027 2097 agt = trace_ust_find_agent(usess, domain->type);
fefd409b 2098 if (!agt) {
5cdb6027 2099 agt = agent_create(domain->type);
fefd409b 2100 if (!agt) {
e5b3c48c 2101 ret = LTTNG_ERR_NOMEM;
fefd409b
DG
2102 goto error;
2103 }
2104 agent_add(agt, usess->agents);
2105 }
2106
022d91ba 2107 /* Create the default tracepoint. */
996de3c7 2108 memset(&uevent, 0, sizeof(uevent));
f20baf8e
DG
2109 uevent.type = LTTNG_EVENT_TRACEPOINT;
2110 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
51755dc8
JG
2111 default_event_name = event_get_default_agent_ust_name(
2112 domain->type);
da6c3a50 2113 if (!default_event_name) {
e5b3c48c 2114 ret = LTTNG_ERR_FATAL;
da6c3a50 2115 goto error;
f43f95a9 2116 }
da6c3a50 2117 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
f20baf8e
DG
2118 uevent.name[sizeof(uevent.name) - 1] = '\0';
2119
2120 /*
2121 * The domain type is changed because we are about to enable the
2122 * default channel and event for the JUL domain that are hardcoded.
2123 * This happens in the UST domain.
2124 */
2125 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
2126 tmp_dom.type = LTTNG_DOMAIN_UST;
2127
0e115563
DG
2128 switch (domain->type) {
2129 case LTTNG_DOMAIN_LOG4J:
da6c3a50 2130 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
0e115563
DG
2131 break;
2132 case LTTNG_DOMAIN_JUL:
da6c3a50 2133 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
0e115563
DG
2134 break;
2135 case LTTNG_DOMAIN_PYTHON:
2136 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
2137 break;
2138 default:
e98a44b0 2139 /* The switch/case we are in makes this impossible */
0e115563 2140 assert(0);
da6c3a50
DG
2141 }
2142
971da06a 2143 {
8404118c 2144 char *filter_expression_copy = NULL;
51755dc8 2145 struct lttng_filter_bytecode *filter_copy = NULL;
971da06a
JG
2146
2147 if (filter) {
51755dc8
JG
2148 const size_t filter_size = sizeof(
2149 struct lttng_filter_bytecode)
2150 + filter->len;
2151
2152 filter_copy = zmalloc(filter_size);
971da06a 2153 if (!filter_copy) {
018096a4 2154 ret = LTTNG_ERR_NOMEM;
b742e3e2 2155 goto error;
971da06a 2156 }
51755dc8 2157 memcpy(filter_copy, filter, filter_size);
971da06a 2158
8404118c
JG
2159 filter_expression_copy =
2160 strdup(filter_expression);
2161 if (!filter_expression) {
2162 ret = LTTNG_ERR_NOMEM;
51755dc8
JG
2163 }
2164
2165 if (!filter_expression_copy || !filter_copy) {
2166 free(filter_expression_copy);
2167 free(filter_copy);
2168 goto error;
8404118c 2169 }
971da06a
JG
2170 }
2171
88f06f15 2172 ret = cmd_enable_event_internal(session, &tmp_dom,
971da06a 2173 (char *) default_chan_name,
8404118c
JG
2174 &uevent, filter_expression_copy,
2175 filter_copy, NULL, wpipe);
971da06a
JG
2176 }
2177
94382e15
JG
2178 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2179 goto already_enabled;
2180 } else if (ret != LTTNG_OK) {
f20baf8e
DG
2181 goto error;
2182 }
2183
2184 /* The wild card * means that everything should be enabled. */
2185 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
8404118c
JG
2186 ret = event_agent_enable_all(usess, agt, event, filter,
2187 filter_expression);
f20baf8e 2188 } else {
8404118c
JG
2189 ret = event_agent_enable(usess, agt, event, filter,
2190 filter_expression);
f20baf8e 2191 }
51755dc8
JG
2192 filter = NULL;
2193 filter_expression = NULL;
f20baf8e
DG
2194 if (ret != LTTNG_OK) {
2195 goto error;
2196 }
2197
2198 break;
2199 }
2f77fc4b 2200 default:
f73fabfd 2201 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2202 goto error;
2203 }
2204
f73fabfd 2205 ret = LTTNG_OK;
2f77fc4b 2206
94382e15 2207already_enabled:
2f77fc4b 2208error:
49d21f93
MD
2209 free(filter_expression);
2210 free(filter);
2211 free(exclusion);
cf0bcb51 2212 channel_attr_destroy(attr);
2223c96f 2213 rcu_read_unlock();
2f77fc4b
DG
2214 return ret;
2215}
2216
88f06f15
JG
2217/*
2218 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2219 * We own filter, exclusion, and filter_expression.
2220 */
2221int cmd_enable_event(struct ltt_session *session, 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, false);
2230}
2231
2232/*
2233 * Enable an event which is internal to LTTng. An internal should
2234 * never be made visible to clients and are immune to checks such as
2235 * reserved names.
2236 */
2237static int cmd_enable_event_internal(struct ltt_session *session,
2238 struct lttng_domain *domain,
2239 char *channel_name, struct lttng_event *event,
2240 char *filter_expression,
2241 struct lttng_filter_bytecode *filter,
2242 struct lttng_event_exclusion *exclusion,
2243 int wpipe)
2244{
2245 return _cmd_enable_event(session, domain, channel_name, event,
2246 filter_expression, filter, exclusion, wpipe, true);
2247}
2248
2f77fc4b
DG
2249/*
2250 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2251 */
56a37563
JG
2252ssize_t cmd_list_tracepoints(enum lttng_domain_type domain,
2253 struct lttng_event **events)
2f77fc4b
DG
2254{
2255 int ret;
2256 ssize_t nb_events = 0;
2257
2258 switch (domain) {
2259 case LTTNG_DOMAIN_KERNEL:
2260 nb_events = kernel_list_events(kernel_tracer_fd, events);
2261 if (nb_events < 0) {
f73fabfd 2262 ret = LTTNG_ERR_KERN_LIST_FAIL;
2f77fc4b
DG
2263 goto error;
2264 }
2265 break;
2266 case LTTNG_DOMAIN_UST:
2267 nb_events = ust_app_list_events(events);
2268 if (nb_events < 0) {
f73fabfd 2269 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
2270 goto error;
2271 }
2272 break;
5cdb6027 2273 case LTTNG_DOMAIN_LOG4J:
3c6a091f 2274 case LTTNG_DOMAIN_JUL:
0e115563 2275 case LTTNG_DOMAIN_PYTHON:
f60140a1 2276 nb_events = agent_list_events(events, domain);
3c6a091f
DG
2277 if (nb_events < 0) {
2278 ret = LTTNG_ERR_UST_LIST_FAIL;
2279 goto error;
2280 }
2281 break;
2f77fc4b 2282 default:
f73fabfd 2283 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2284 goto error;
2285 }
2286
2287 return nb_events;
2288
2289error:
2290 /* Return negative value to differentiate return code */
2291 return -ret;
2292}
2293
2294/*
2295 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2296 */
56a37563 2297ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain,
2f77fc4b
DG
2298 struct lttng_event_field **fields)
2299{
2300 int ret;
2301 ssize_t nb_fields = 0;
2302
2303 switch (domain) {
2304 case LTTNG_DOMAIN_UST:
2305 nb_fields = ust_app_list_event_fields(fields);
2306 if (nb_fields < 0) {
f73fabfd 2307 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
2308 goto error;
2309 }
2310 break;
2311 case LTTNG_DOMAIN_KERNEL:
2312 default: /* fall-through */
f73fabfd 2313 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2314 goto error;
2315 }
2316
2317 return nb_fields;
2318
2319error:
2320 /* Return negative value to differentiate return code */
2321 return -ret;
2322}
2323
834978fd
DG
2324ssize_t cmd_list_syscalls(struct lttng_event **events)
2325{
2326 return syscall_table_list(events);
2327}
2328
a5dfbb9d
MD
2329/*
2330 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2331 *
2332 * Called with session lock held.
2333 */
2334ssize_t cmd_list_tracker_pids(struct ltt_session *session,
56a37563 2335 enum lttng_domain_type domain, int32_t **pids)
a5dfbb9d
MD
2336{
2337 int ret;
2338 ssize_t nr_pids = 0;
2339
2340 switch (domain) {
2341 case LTTNG_DOMAIN_KERNEL:
2342 {
2343 struct ltt_kernel_session *ksess;
2344
2345 ksess = session->kernel_session;
2346 nr_pids = kernel_list_tracker_pids(ksess, pids);
2347 if (nr_pids < 0) {
2348 ret = LTTNG_ERR_KERN_LIST_FAIL;
2349 goto error;
2350 }
2351 break;
2352 }
2353 case LTTNG_DOMAIN_UST:
2354 {
2355 struct ltt_ust_session *usess;
2356
2357 usess = session->ust_session;
2358 nr_pids = trace_ust_list_tracker_pids(usess, pids);
2359 if (nr_pids < 0) {
2360 ret = LTTNG_ERR_UST_LIST_FAIL;
2361 goto error;
2362 }
2363 break;
2364 }
2365 case LTTNG_DOMAIN_LOG4J:
2366 case LTTNG_DOMAIN_JUL:
2367 case LTTNG_DOMAIN_PYTHON:
2368 default:
2369 ret = LTTNG_ERR_UND;
2370 goto error;
2371 }
2372
2373 return nr_pids;
2374
2375error:
2376 /* Return negative value to differentiate return code */
2377 return -ret;
2378}
2379
a1ae2ea5
JD
2380static
2381int domain_mkdir(const struct consumer_output *output,
2382 const struct ltt_session *session,
2383 uid_t uid, gid_t gid)
2384{
2385 struct consumer_socket *socket;
2386 struct lttng_ht_iter iter;
2387 int ret;
2388 char *path = NULL;
2389
2390 if (!output || !output->socks) {
2391 ERR("No consumer output found");
2392 ret = -1;
2393 goto end;
2394 }
2395
2396 path = zmalloc(LTTNG_PATH_MAX * sizeof(char));
2397 if (!path) {
2398 ERR("Cannot allocate mkdir path");
2399 ret = -1;
2400 goto end;
2401 }
2402
2403 ret = snprintf(path, LTTNG_PATH_MAX, "%s%s%s",
2404 session_get_base_path(session),
2405 output->chunk_path, output->subdir);
2406 if (ret < 0 || ret >= LTTNG_PATH_MAX) {
2407 ERR("Format path");
2408 ret = -1;
2409 goto end;
2410 }
2411
2412 DBG("Domain mkdir %s for session %" PRIu64, path, session->id);
2413 rcu_read_lock();
2414 /*
2415 * We have to iterate to find a socket, but we only need to send the
2416 * rename command to one consumer, so we break after the first one.
2417 */
2418 cds_lfht_for_each_entry(output->socks->ht, &iter.iter, socket, node.node) {
2419 pthread_mutex_lock(socket->lock);
2420 ret = consumer_mkdir(socket, session->id, output, path, uid, gid);
2421 pthread_mutex_unlock(socket->lock);
2422 if (ret) {
2423 ERR("Consumer mkdir");
2424 ret = -1;
2425 goto end_unlock;
2426 }
2427 break;
2428 }
2429
2430 ret = 0;
2431
2432end_unlock:
2433 rcu_read_unlock();
2434end:
2435 free(path);
2436 return ret;
2437}
2438
2439static
2440int session_mkdir(const struct ltt_session *session)
2441{
2442 int ret;
2443 struct consumer_output *output;
2444 uid_t uid;
2445 gid_t gid;
2446
2447 /*
2448 * Unsupported feature in lttng-relayd before 2.11, not an error since it
2449 * is only needed for session rotation and the user will get an error
2450 * on rotate.
2451 */
2452 if (session->consumer->type == CONSUMER_DST_NET &&
2453 session->consumer->relay_major_version == 2 &&
2454 session->consumer->relay_minor_version < 11) {
2455 ret = 0;
2456 goto end;
2457 }
2458
2459 if (session->kernel_session) {
2460 output = session->kernel_session->consumer;
2461 uid = session->kernel_session->uid;
2462 gid = session->kernel_session->gid;
2463 ret = domain_mkdir(output, session, uid, gid);
2464 if (ret) {
2465 ERR("Mkdir kernel");
2466 goto end;
2467 }
2468 }
2469
2470 if (session->ust_session) {
2471 output = session->ust_session->consumer;
2472 uid = session->ust_session->uid;
2473 gid = session->ust_session->gid;
2474 ret = domain_mkdir(output, session, uid, gid);
2475 if (ret) {
2476 ERR("Mkdir UST");
2477 goto end;
2478 }
2479 }
2480
2481 ret = 0;
2482
2483end:
2484 return ret;
2485}
2486
2f77fc4b
DG
2487/*
2488 * Command LTTNG_START_TRACE processed by the client thread.
a9ad0c8f
MD
2489 *
2490 * Called with session mutex held.
2f77fc4b
DG
2491 */
2492int cmd_start_trace(struct ltt_session *session)
2493{
2494 int ret;
cde3e505 2495 unsigned long nb_chan = 0;
2f77fc4b
DG
2496 struct ltt_kernel_session *ksession;
2497 struct ltt_ust_session *usess;
2f77fc4b
DG
2498
2499 assert(session);
2500
2501 /* Ease our life a bit ;) */
2502 ksession = session->kernel_session;
2503 usess = session->ust_session;
2504
8382cf6f
DG
2505 /* Is the session already started? */
2506 if (session->active) {
f73fabfd 2507 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2508 goto error;
2509 }
2510
cde3e505
DG
2511 /*
2512 * Starting a session without channel is useless since after that it's not
2513 * possible to enable channel thus inform the client.
2514 */
2515 if (usess && usess->domain_global.channels) {
2516 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
2517 }
2518 if (ksession) {
2519 nb_chan += ksession->channel_count;
2520 }
2521 if (!nb_chan) {
2522 ret = LTTNG_ERR_NO_CHANNEL;
2523 goto error;
2524 }
2525
5c408ad8
JD
2526 /*
2527 * Record the timestamp of the first time the session is started for
2528 * an eventual session rotation call.
2529 */
c996624c 2530 if (!session->has_been_started) {
5c408ad8
JD
2531 session->current_chunk_start_ts = time(NULL);
2532 if (session->current_chunk_start_ts == (time_t) -1) {
2533 PERROR("Failed to retrieve the \"%s\" session's start time",
2534 session->name);
2535 ret = LTTNG_ERR_FATAL;
2536 goto error;
2537 }
c996624c
JD
2538 if (!session->snapshot_mode && session->output_traces) {
2539 ret = session_mkdir(session);
2540 if (ret) {
2541 ERR("Failed to create the session directories");
2542 ret = LTTNG_ERR_CREATE_DIR_FAIL;
2543 goto error;
2544 }
2545 }
2546 }
2547
2f77fc4b
DG
2548 /* Kernel tracing */
2549 if (ksession != NULL) {
c996624c 2550 DBG("Start kernel tracing session %s", session->name);
9b6c7ec5
DG
2551 ret = start_kernel_session(ksession, kernel_tracer_fd);
2552 if (ret != LTTNG_OK) {
2f77fc4b
DG
2553 goto error;
2554 }
2f77fc4b
DG
2555 }
2556
2557 /* Flag session that trace should start automatically */
2558 if (usess) {
14fb1ebe
DG
2559 /*
2560 * Even though the start trace might fail, flag this session active so
2561 * other application coming in are started by default.
2562 */
2563 usess->active = 1;
2f77fc4b
DG
2564
2565 ret = ust_app_start_trace_all(usess);
2566 if (ret < 0) {
f73fabfd 2567 ret = LTTNG_ERR_UST_START_FAIL;
2f77fc4b
DG
2568 goto error;
2569 }
2570 }
2571
8382cf6f
DG
2572 /* Flag this after a successful start. */
2573 session->has_been_started = 1;
2574 session->active = 1;
9b6c7ec5 2575
5c408ad8
JD
2576 /*
2577 * Clear the flag that indicates that a rotation was done while the
2578 * session was stopped.
2579 */
2580 session->rotated_after_last_stop = false;
2581
259c2674
JD
2582 if (session->rotate_timer_period) {
2583 ret = sessiond_rotate_timer_start(session,
2584 session->rotate_timer_period);
2585 if (ret < 0) {
2586 ERR("Failed to enable rotate timer");
2587 ret = LTTNG_ERR_UNK;
2588 goto error;
2589 }
2590 }
2591
f73fabfd 2592 ret = LTTNG_OK;
2f77fc4b
DG
2593
2594error:
2595 return ret;
2596}
2597
5c408ad8
JD
2598static
2599int rename_active_chunk(struct ltt_session *session)
2600{
2601 int ret;
2602
2603 session->rotate_count++;
2604
2605 /*
2606 * The currently active tracing path is now the folder we
2607 * want to rename.
2608 */
2609 ret = lttng_strncpy(session->rotation_chunk.current_rotate_path,
2610 session->rotation_chunk.active_tracing_path,
2611 sizeof(session->rotation_chunk.current_rotate_path));
2612 if (ret) {
2613 ERR("Failed to copy active tracing path");
2614 goto end;
2615 }
2616
2617 ret = rename_complete_chunk(session, time(NULL));
2618 if (ret < 0) {
2619 ERR("Failed to rename current rotate path");
2620 goto end;
2621 }
2622
2623 /*
2624 * We just renamed, the folder, we didn't do an actual rotation, so
2625 * the active tracing path is now the renamed folder and we have to
2626 * restore the rotate count.
2627 */
2628 ret = lttng_strncpy(session->rotation_chunk.active_tracing_path,
2629 session->rotation_chunk.current_rotate_path,
2630 sizeof(session->rotation_chunk.active_tracing_path));
2631 if (ret) {
2632 ERR("Failed to rename active session chunk tracing path");
2633 goto end;
2634 }
2635end:
2636 session->rotate_count--;
2637 return ret;
2638}
2639
2f77fc4b
DG
2640/*
2641 * Command LTTNG_STOP_TRACE processed by the client thread.
2642 */
2643int cmd_stop_trace(struct ltt_session *session)
2644{
2645 int ret;
2646 struct ltt_kernel_channel *kchan;
2647 struct ltt_kernel_session *ksession;
2648 struct ltt_ust_session *usess;
5c408ad8 2649 bool error_occured = false;
2f77fc4b
DG
2650
2651 assert(session);
2652
5c408ad8 2653 DBG("Begin stop session %s (id %" PRIu64 ")", session->name, session->id);
2f77fc4b
DG
2654 /* Short cut */
2655 ksession = session->kernel_session;
2656 usess = session->ust_session;
2657
8382cf6f
DG
2658 /* Session is not active. Skip everythong and inform the client. */
2659 if (!session->active) {
f73fabfd 2660 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2f77fc4b
DG
2661 goto error;
2662 }
2663
d88744a4
JD
2664 if (session->rotate_relay_pending_timer_enabled) {
2665 sessiond_timer_rotate_pending_stop(session);
2666 }
2667
259c2674
JD
2668 if (session->rotate_timer_enabled) {
2669 sessiond_rotate_timer_stop(session);
2670 }
2671
5c408ad8
JD
2672 if (session->rotate_count > 0 && !session->rotate_pending) {
2673 ret = rename_active_chunk(session);
2674 if (ret) {
2675 /*
2676 * This error should not prevent the user from stopping
2677 * the session. However, it will be reported at the end.
2678 */
2679 error_occured = true;
2680 }
2681 }
2682
2f77fc4b 2683 /* Kernel tracer */
14fb1ebe 2684 if (ksession && ksession->active) {
2f77fc4b
DG
2685 DBG("Stop kernel tracing");
2686
566d8970
MD
2687 ret = kernel_stop_session(ksession);
2688 if (ret < 0) {
2689 ret = LTTNG_ERR_KERN_STOP_FAIL;
2690 goto error;
2691 }
2692
2693 kernel_wait_quiescent(kernel_tracer_fd);
2694
2695 /* Flush metadata after stopping (if exists) */
2f77fc4b
DG
2696 if (ksession->metadata_stream_fd >= 0) {
2697 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2698 if (ret < 0) {
2699 ERR("Kernel metadata flush failed");
2700 }
2701 }
2702
566d8970 2703 /* Flush all buffers after stopping */
2f77fc4b
DG
2704 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2705 ret = kernel_flush_buffer(kchan);
2706 if (ret < 0) {
2707 ERR("Kernel flush buffer error");
2708 }
2709 }
2710
14fb1ebe 2711 ksession->active = 0;
5c408ad8
JD
2712 DBG("Kernel session stopped %s (id %" PRIu64 ")", session->name,
2713 session->id);
2f77fc4b
DG
2714 }
2715
14fb1ebe
DG
2716 if (usess && usess->active) {
2717 /*
2718 * Even though the stop trace might fail, flag this session inactive so
2719 * other application coming in are not started by default.
2720 */
2721 usess->active = 0;
2f77fc4b
DG
2722
2723 ret = ust_app_stop_trace_all(usess);
2724 if (ret < 0) {
f73fabfd 2725 ret = LTTNG_ERR_UST_STOP_FAIL;
2f77fc4b
DG
2726 goto error;
2727 }
2728 }
2729
8382cf6f
DG
2730 /* Flag inactive after a successful stop. */
2731 session->active = 0;
5c408ad8 2732 ret = !error_occured ? LTTNG_OK : LTTNG_ERR_UNK;
2f77fc4b
DG
2733
2734error:
2735 return ret;
2736}
2737
2738/*
2739 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2740 */
bda32d56
JG
2741int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2742 struct lttng_uri *uris)
2f77fc4b
DG
2743{
2744 int ret, i;
2745 struct ltt_kernel_session *ksess = session->kernel_session;
2746 struct ltt_ust_session *usess = session->ust_session;
2f77fc4b
DG
2747
2748 assert(session);
2749 assert(uris);
2750 assert(nb_uri > 0);
2751
8382cf6f
DG
2752 /* Can't set consumer URI if the session is active. */
2753 if (session->active) {
f73fabfd 2754 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2755 goto error;
2756 }
2757
bda32d56 2758 /* Set the "global" consumer URIs */
2f77fc4b 2759 for (i = 0; i < nb_uri; i++) {
bda32d56
JG
2760 ret = add_uri_to_consumer(session->consumer,
2761 &uris[i], 0, session->name);
a74934ba 2762 if (ret != LTTNG_OK) {
2f77fc4b
DG
2763 goto error;
2764 }
2f77fc4b
DG
2765 }
2766
bda32d56
JG
2767 /* Set UST session URIs */
2768 if (session->ust_session) {
2769 for (i = 0; i < nb_uri; i++) {
2770 ret = add_uri_to_consumer(
2771 session->ust_session->consumer,
2772 &uris[i], LTTNG_DOMAIN_UST,
2773 session->name);
2774 if (ret != LTTNG_OK) {
2775 goto error;
2776 }
2777 }
2778 }
2779
2780 /* Set kernel session URIs */
2781 if (session->kernel_session) {
2782 for (i = 0; i < nb_uri; i++) {
2783 ret = add_uri_to_consumer(
2784 session->kernel_session->consumer,
2785 &uris[i], LTTNG_DOMAIN_KERNEL,
2786 session->name);
2787 if (ret != LTTNG_OK) {
2788 goto error;
2789 }
2790 }
2791 }
2792
7ab70fe0
DG
2793 /*
2794 * Make sure to set the session in output mode after we set URI since a
2795 * session can be created without URL (thus flagged in no output mode).
2796 */
2797 session->output_traces = 1;
2798 if (ksess) {
2799 ksess->output_traces = 1;
bda32d56
JG
2800 }
2801
2802 if (usess) {
7ab70fe0
DG
2803 usess->output_traces = 1;
2804 }
2805
2f77fc4b 2806 /* All good! */
f73fabfd 2807 ret = LTTNG_OK;
2f77fc4b
DG
2808
2809error:
2810 return ret;
2811}
2812
2813/*
2814 * Command LTTNG_CREATE_SESSION processed by the client thread.
2815 */
2816int cmd_create_session_uri(char *name, struct lttng_uri *uris,
ecc48a90 2817 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2f77fc4b
DG
2818{
2819 int ret;
2f77fc4b
DG
2820 struct ltt_session *session;
2821
2822 assert(name);
2bba9e53 2823 assert(creds);
785d2d0d 2824
2f77fc4b
DG
2825 /*
2826 * Verify if the session already exist
2827 *
2828 * XXX: There is no need for the session lock list here since the caller
2829 * (process_client_msg) is holding it. We might want to change that so a
2830 * single command does not lock the entire session list.
2831 */
2832 session = session_find_by_name(name);
2833 if (session != NULL) {
f73fabfd 2834 ret = LTTNG_ERR_EXIST_SESS;
2f77fc4b
DG
2835 goto find_error;
2836 }
2837
2838 /* Create tracing session in the registry */
dec56f6c 2839 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2f77fc4b 2840 LTTNG_SOCK_GET_GID_CRED(creds));
f73fabfd 2841 if (ret != LTTNG_OK) {
2f77fc4b
DG
2842 goto session_error;
2843 }
2844
2845 /*
2846 * Get the newly created session pointer back
2847 *
2848 * XXX: There is no need for the session lock list here since the caller
2849 * (process_client_msg) is holding it. We might want to change that so a
2850 * single command does not lock the entire session list.
2851 */
2852 session = session_find_by_name(name);
2853 assert(session);
2854
ecc48a90 2855 session->live_timer = live_timer;
2f77fc4b
DG
2856 /* Create default consumer output for the session not yet created. */
2857 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2858 if (session->consumer == NULL) {
f73fabfd 2859 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2860 goto consumer_error;
2861 }
2862
2bba9e53 2863 if (uris) {
bda32d56 2864 ret = cmd_set_consumer_uri(session, nb_uri, uris);
2bba9e53
DG
2865 if (ret != LTTNG_OK) {
2866 goto consumer_error;
2867 }
2868 session->output_traces = 1;
2869 } else {
2870 session->output_traces = 0;
2871 DBG2("Session %s created with no output", session->name);
2f77fc4b
DG
2872 }
2873
2874 session->consumer->enabled = 1;
2875
f73fabfd 2876 return LTTNG_OK;
2f77fc4b
DG
2877
2878consumer_error:
2879 session_destroy(session);
2880session_error:
2881find_error:
2882 return ret;
2883}
2884
27babd3a
DG
2885/*
2886 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2887 */
2888int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2889 size_t nb_uri, lttng_sock_cred *creds)
2890{
2891 int ret;
2892 struct ltt_session *session;
2893 struct snapshot_output *new_output = NULL;
2894
2895 assert(name);
2896 assert(creds);
2897
2898 /*
2899 * Create session in no output mode with URIs set to NULL. The uris we've
2900 * received are for a default snapshot output if one.
2901 */
ae58b817 2902 ret = cmd_create_session_uri(name, NULL, 0, creds, 0);
27babd3a
DG
2903 if (ret != LTTNG_OK) {
2904 goto error;
2905 }
2906
2907 /* Get the newly created session pointer back. This should NEVER fail. */
2908 session = session_find_by_name(name);
2909 assert(session);
2910
2911 /* Flag session for snapshot mode. */
2912 session->snapshot_mode = 1;
2913
2914 /* Skip snapshot output creation if no URI is given. */
2915 if (nb_uri == 0) {
2916 goto end;
2917 }
2918
2919 new_output = snapshot_output_alloc();
2920 if (!new_output) {
2921 ret = LTTNG_ERR_NOMEM;
2922 goto error_snapshot_alloc;
2923 }
2924
2925 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2926 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2927 if (ret < 0) {
2928 if (ret == -ENOMEM) {
2929 ret = LTTNG_ERR_NOMEM;
2930 } else {
2931 ret = LTTNG_ERR_INVALID;
2932 }
2933 goto error_snapshot;
2934 }
2935
2936 rcu_read_lock();
2937 snapshot_add_output(&session->snapshot, new_output);
2938 rcu_read_unlock();
2939
2940end:
2941 return LTTNG_OK;
2942
2943error_snapshot:
2944 snapshot_output_destroy(new_output);
2945error_snapshot_alloc:
2946 session_destroy(session);
2947error:
2948 return ret;
2949}
2950
2f77fc4b
DG
2951/*
2952 * Command LTTNG_DESTROY_SESSION processed by the client thread.
a9ad0c8f
MD
2953 *
2954 * Called with session lock held.
2f77fc4b 2955 */
90936dcf
JD
2956int cmd_destroy_session(struct ltt_session *session, int wpipe,
2957 struct notification_thread_handle *notification_thread_handle)
2f77fc4b
DG
2958{
2959 int ret;
2960 struct ltt_ust_session *usess;
2961 struct ltt_kernel_session *ksess;
2962
2963 /* Safety net */
2964 assert(session);
2965
2966 usess = session->ust_session;
2967 ksess = session->kernel_session;
2968
5c408ad8
JD
2969 DBG("Begin destroy session %s (id %" PRIu64 ")", session->name, session->id);
2970
d88744a4
JD
2971 if (session->rotate_relay_pending_timer_enabled) {
2972 sessiond_timer_rotate_pending_stop(session);
2973 }
2974
259c2674
JD
2975 if (session->rotate_timer_enabled) {
2976 sessiond_rotate_timer_stop(session);
2977 }
2978
90936dcf
JD
2979 if (session->rotate_size) {
2980 unsubscribe_session_consumed_size_rotation(session, notification_thread_handle);
2981 session->rotate_size = 0;
2982 }
2983
5c408ad8
JD
2984 /*
2985 * The rename of the current chunk is performed at stop, but if we rotated
2986 * the session after the previous stop command, we need to rename the
2987 * new (and empty) chunk that was started in between.
2988 */
2989 if (session->rotated_after_last_stop) {
2990 rename_active_chunk(session);
2991 }
2992
2f77fc4b
DG
2993 /* Clean kernel session teardown */
2994 kernel_destroy_session(ksess);
2995
2996 /* UST session teardown */
2997 if (usess) {
2998 /* Close any relayd session */
2999 consumer_output_send_destroy_relayd(usess->consumer);
3000
3001 /* Destroy every UST application related to this session. */
3002 ret = ust_app_destroy_trace_all(usess);
3003 if (ret) {
3004 ERR("Error in ust_app_destroy_trace_all");
3005 }
3006
3007 /* Clean up the rest. */
3008 trace_ust_destroy_session(usess);
3009 }
3010
3011 /*
3012 * Must notify the kernel thread here to update it's poll set in order to
3013 * remove the channel(s)' fd just destroyed.
3014 */
3015 ret = notify_thread_pipe(wpipe);
3016 if (ret < 0) {
3017 PERROR("write kernel poll pipe");
3018 }
3019
3020 ret = session_destroy(session);
3021
3022 return ret;
3023}
3024
2f77fc4b
DG
3025/*
3026 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3027 */
56a37563
JG
3028int cmd_register_consumer(struct ltt_session *session,
3029 enum lttng_domain_type domain, const char *sock_path,
3030 struct consumer_data *cdata)
2f77fc4b
DG
3031{
3032 int ret, sock;
dd81b457 3033 struct consumer_socket *socket = NULL;
2f77fc4b
DG
3034
3035 assert(session);
3036 assert(cdata);
3037 assert(sock_path);
3038
3039 switch (domain) {
3040 case LTTNG_DOMAIN_KERNEL:
3041 {
3042 struct ltt_kernel_session *ksess = session->kernel_session;
3043
3044 assert(ksess);
3045
3046 /* Can't register a consumer if there is already one */
3047 if (ksess->consumer_fds_sent != 0) {
f73fabfd 3048 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
3049 goto error;
3050 }
3051
3052 sock = lttcomm_connect_unix_sock(sock_path);
3053 if (sock < 0) {
f73fabfd 3054 ret = LTTNG_ERR_CONNECT_FAIL;
2f77fc4b
DG
3055 goto error;
3056 }
4ce514c4 3057 cdata->cmd_sock = sock;
2f77fc4b 3058
4ce514c4 3059 socket = consumer_allocate_socket(&cdata->cmd_sock);
2f77fc4b 3060 if (socket == NULL) {
f66c074c
DG
3061 ret = close(sock);
3062 if (ret < 0) {
3063 PERROR("close register consumer");
3064 }
4ce514c4 3065 cdata->cmd_sock = -1;
f73fabfd 3066 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
3067 goto error;
3068 }
3069
3070 socket->lock = zmalloc(sizeof(pthread_mutex_t));
3071 if (socket->lock == NULL) {
3072 PERROR("zmalloc pthread mutex");
f73fabfd 3073 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
3074 goto error;
3075 }
3076 pthread_mutex_init(socket->lock, NULL);
3077 socket->registered = 1;
3078
3079 rcu_read_lock();
3080 consumer_add_socket(socket, ksess->consumer);
3081 rcu_read_unlock();
3082
3083 pthread_mutex_lock(&cdata->pid_mutex);
3084 cdata->pid = -1;
3085 pthread_mutex_unlock(&cdata->pid_mutex);
3086
3087 break;
3088 }
3089 default:
3090 /* TODO: Userspace tracing */
f73fabfd 3091 ret = LTTNG_ERR_UND;
2f77fc4b
DG
3092 goto error;
3093 }
3094
dd81b457 3095 return LTTNG_OK;
2f77fc4b
DG
3096
3097error:
dd81b457
DG
3098 if (socket) {
3099 consumer_destroy_socket(socket);
3100 }
2f77fc4b
DG
3101 return ret;
3102}
3103
3104/*
3105 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3106 */
3107ssize_t cmd_list_domains(struct ltt_session *session,
3108 struct lttng_domain **domains)
3109{
3110 int ret, index = 0;
3111 ssize_t nb_dom = 0;
fefd409b
DG
3112 struct agent *agt;
3113 struct lttng_ht_iter iter;
2f77fc4b
DG
3114
3115 if (session->kernel_session != NULL) {
3116 DBG3("Listing domains found kernel domain");
3117 nb_dom++;
3118 }
3119
3120 if (session->ust_session != NULL) {
3121 DBG3("Listing domains found UST global domain");
3122 nb_dom++;
3c6a091f 3123
e0a74f01 3124 rcu_read_lock();
fefd409b
DG
3125 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
3126 agt, node.node) {
3127 if (agt->being_used) {
3128 nb_dom++;
3129 }
3c6a091f 3130 }
e0a74f01 3131 rcu_read_unlock();
2f77fc4b
DG
3132 }
3133
fa64dfb4
JG
3134 if (!nb_dom) {
3135 goto end;
3136 }
3137
2f77fc4b
DG
3138 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3139 if (*domains == NULL) {
f73fabfd 3140 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
3141 goto error;
3142 }
3143
3144 if (session->kernel_session != NULL) {
3145 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
b5edb9e8
PP
3146
3147 /* Kernel session buffer type is always GLOBAL */
3148 (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL;
3149
2f77fc4b
DG
3150 index++;
3151 }
3152
3153 if (session->ust_session != NULL) {
3154 (*domains)[index].type = LTTNG_DOMAIN_UST;
88c5f0d8 3155 (*domains)[index].buf_type = session->ust_session->buffer_type;
2f77fc4b 3156 index++;
3c6a091f 3157
e0a74f01 3158 rcu_read_lock();
fefd409b
DG
3159 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
3160 agt, node.node) {
3161 if (agt->being_used) {
3162 (*domains)[index].type = agt->domain;
3163 (*domains)[index].buf_type = session->ust_session->buffer_type;
3164 index++;
3165 }
3c6a091f 3166 }
e0a74f01 3167 rcu_read_unlock();
2f77fc4b 3168 }
fa64dfb4 3169end:
2f77fc4b
DG
3170 return nb_dom;
3171
3172error:
f73fabfd
DG
3173 /* Return negative value to differentiate return code */
3174 return -ret;
2f77fc4b
DG
3175}
3176
3177
3178/*
3179 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3180 */
56a37563
JG
3181ssize_t cmd_list_channels(enum lttng_domain_type domain,
3182 struct ltt_session *session, struct lttng_channel **channels)
2f77fc4b 3183{
53e367f9 3184 ssize_t nb_chan = 0, payload_size = 0, ret;
2f77fc4b
DG
3185
3186 switch (domain) {
3187 case LTTNG_DOMAIN_KERNEL:
3188 if (session->kernel_session != NULL) {
3189 nb_chan = session->kernel_session->channel_count;
3190 }
3191 DBG3("Number of kernel channels %zd", nb_chan);
c7d620a2 3192 if (nb_chan <= 0) {
53e367f9
JG
3193 ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND;
3194 goto end;
c7d620a2 3195 }
2f77fc4b
DG
3196 break;
3197 case LTTNG_DOMAIN_UST:
3198 if (session->ust_session != NULL) {
7ffc31a2 3199 rcu_read_lock();
2f77fc4b 3200 nb_chan = lttng_ht_get_count(
7ffc31a2
JG
3201 session->ust_session->domain_global.channels);
3202 rcu_read_unlock();
2f77fc4b
DG
3203 }
3204 DBG3("Number of UST global channels %zd", nb_chan);
ade7ce52 3205 if (nb_chan < 0) {
53e367f9
JG
3206 ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND;
3207 goto end;
c7d620a2 3208 }
2f77fc4b
DG
3209 break;
3210 default:
53e367f9
JG
3211 ret = -LTTNG_ERR_UND;
3212 goto end;
2f77fc4b
DG
3213 }
3214
3215 if (nb_chan > 0) {
53e367f9 3216 const size_t channel_size = sizeof(struct lttng_channel) +
cf0bcb51
JG
3217 sizeof(struct lttng_channel_extended);
3218 struct lttng_channel_extended *channel_exts;
53e367f9
JG
3219
3220 payload_size = nb_chan * channel_size;
3221 *channels = zmalloc(payload_size);
2f77fc4b 3222 if (*channels == NULL) {
53e367f9
JG
3223 ret = -LTTNG_ERR_FATAL;
3224 goto end;
2f77fc4b
DG
3225 }
3226
53e367f9
JG
3227 channel_exts = ((void *) *channels) +
3228 (nb_chan * sizeof(struct lttng_channel));
d449df4a
MD
3229 ret = list_lttng_channels(domain, session, *channels, channel_exts);
3230 if (ret != LTTNG_OK) {
3231 free(*channels);
3232 *channels = NULL;
3233 goto end;
3234 }
53e367f9
JG
3235 } else {
3236 *channels = NULL;
2f77fc4b
DG
3237 }
3238
53e367f9
JG
3239 ret = payload_size;
3240end:
3241 return ret;
2f77fc4b
DG
3242}
3243
3244/*
3245 * Command LTTNG_LIST_EVENTS processed by the client thread.
3246 */
56a37563
JG
3247ssize_t cmd_list_events(enum lttng_domain_type domain,
3248 struct ltt_session *session, char *channel_name,
b4e3ceb9 3249 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
3250{
3251 int ret = 0;
3252 ssize_t nb_event = 0;
3253
3254 switch (domain) {
3255 case LTTNG_DOMAIN_KERNEL:
3256 if (session->kernel_session != NULL) {
3257 nb_event = list_lttng_kernel_events(channel_name,
b4e3ceb9
PP
3258 session->kernel_session, events,
3259 total_size);
2f77fc4b
DG
3260 }
3261 break;
3262 case LTTNG_DOMAIN_UST:
3263 {
3264 if (session->ust_session != NULL) {
3265 nb_event = list_lttng_ust_global_events(channel_name,
b4e3ceb9
PP
3266 &session->ust_session->domain_global, events,
3267 total_size);
2f77fc4b
DG
3268 }
3269 break;
3270 }
5cdb6027 3271 case LTTNG_DOMAIN_LOG4J:
3c6a091f 3272 case LTTNG_DOMAIN_JUL:
0e115563 3273 case LTTNG_DOMAIN_PYTHON:
3c6a091f 3274 if (session->ust_session) {
fefd409b
DG
3275 struct lttng_ht_iter iter;
3276 struct agent *agt;
3277
b11feea5 3278 rcu_read_lock();
fefd409b
DG
3279 cds_lfht_for_each_entry(session->ust_session->agents->ht,
3280 &iter.iter, agt, node.node) {
1dfd9906
JG
3281 if (agt->domain == domain) {
3282 nb_event = list_lttng_agent_events(
b4e3ceb9
PP
3283 agt, events,
3284 total_size);
1dfd9906
JG
3285 break;
3286 }
fefd409b 3287 }
b11feea5 3288 rcu_read_unlock();
3c6a091f
DG
3289 }
3290 break;
2f77fc4b 3291 default:
f73fabfd 3292 ret = LTTNG_ERR_UND;
2f77fc4b
DG
3293 goto error;
3294 }
3295
f73fabfd 3296 return nb_event;
2f77fc4b
DG
3297
3298error:
f73fabfd
DG
3299 /* Return negative value to differentiate return code */
3300 return -ret;
2f77fc4b
DG
3301}
3302
3303/*
3304 * Using the session list, filled a lttng_session array to send back to the
3305 * client for session listing.
3306 *
3307 * The session list lock MUST be acquired before calling this function. Use
3308 * session_lock_list() and session_unlock_list().
3309 */
3310void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
3311 gid_t gid)
3312{
3313 int ret;
3314 unsigned int i = 0;
3315 struct ltt_session *session;
3316 struct ltt_session_list *list = session_get_list();
3317
3318 DBG("Getting all available session for UID %d GID %d",
3319 uid, gid);
3320 /*
3321 * Iterate over session list and append data after the control struct in
3322 * the buffer.
3323 */
3324 cds_list_for_each_entry(session, &list->head, list) {
3325 /*
3326 * Only list the sessions the user can control.
3327 */
3328 if (!session_access_ok(session, uid, gid)) {
3329 continue;
3330 }
3331
3332 struct ltt_kernel_session *ksess = session->kernel_session;
3333 struct ltt_ust_session *usess = session->ust_session;
3334
3335 if (session->consumer->type == CONSUMER_DST_NET ||
3336 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
3337 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
3338 ret = build_network_session_path(sessions[i].path,
dec56f6c 3339 sizeof(sessions[i].path), session);
2f77fc4b 3340 } else {
dec56f6c 3341 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
366a9222 3342 session->consumer->dst.session_root_path);
2f77fc4b
DG
3343 }
3344 if (ret < 0) {
3345 PERROR("snprintf session path");
3346 continue;
3347 }
3348
3349 strncpy(sessions[i].name, session->name, NAME_MAX);
3350 sessions[i].name[NAME_MAX - 1] = '\0';
8382cf6f 3351 sessions[i].enabled = session->active;
2cbf8fed 3352 sessions[i].snapshot_mode = session->snapshot_mode;
8960e9cd 3353 sessions[i].live_timer_interval = session->live_timer;
2f77fc4b
DG
3354 i++;
3355 }
3356}
3357
806e2684 3358/*
6d805429