relayd: clean-up: strncpy uses the length of the source as length
[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>
a503e1ef 24#include <sys/stat.h>
d2956687 25#include <stdio.h>
2f77fc4b
DG
26
27#include <common/defaults.h>
28#include <common/common.h>
29#include <common/sessiond-comm/sessiond-comm.h>
30#include <common/relayd/relayd.h>
10a50311 31#include <common/utils.h>
f5436bfc 32#include <common/compat/string.h>
93ec662e 33#include <common/kernel-ctl/kernel-ctl.h>
b0880ae5
JG
34#include <common/dynamic-buffer.h>
35#include <common/buffer-view.h>
82b69413 36#include <common/trace-chunk.h>
3e3665b8 37#include <lttng/location-internal.h>
b0880ae5
JG
38#include <lttng/trigger/trigger-internal.h>
39#include <lttng/condition/condition.h>
40#include <lttng/action/action.h>
6e21424e 41#include <lttng/channel.h>
b0880ae5 42#include <lttng/channel-internal.h>
5c408ad8 43#include <lttng/rotate-internal.h>
17dd1232 44#include <lttng/location-internal.h>
b178f53e 45#include <lttng/session-internal.h>
3c02e545 46#include <lttng/userspace-probe-internal.h>
b178f53e 47#include <lttng/session-descriptor-internal.h>
9f449915 48#include <common/string-utils/string-utils.h>
2f77fc4b
DG
49
50#include "channel.h"
51#include "consumer.h"
52#include "event.h"
8782cc74 53#include "health-sessiond.h"
2f77fc4b
DG
54#include "kernel.h"
55#include "kernel-consumer.h"
56#include "lttng-sessiond.h"
57#include "utils.h"
0dbc2034 58#include "lttng-syscall.h"
7c1d2758 59#include "agent.h"
93ec662e 60#include "buffer-registry.h"
b0880ae5
JG
61#include "notification-thread.h"
62#include "notification-thread-commands.h"
5c408ad8
JD
63#include "rotate.h"
64#include "rotation-thread.h"
8e319828 65#include "timer.h"
f28f9e44 66#include "agent-thread.h"
2f77fc4b
DG
67
68#include "cmd.h"
69
a503e1ef
JG
70/* Sleep for 100ms between each check for the shm path's deletion. */
71#define SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US 100000
72
3e3665b8
JG
73struct cmd_destroy_session_reply_context {
74 int reply_sock_fd;
75 bool implicit_rotation_on_destroy;
76};
77
a503e1ef
JG
78static enum lttng_error_code wait_on_path(void *path);
79
80/*
81 * Command completion handler that is used by the destroy command
82 * when a session that has a non-default shm_path is being destroyed.
83 *
84 * See comment in cmd_destroy_session() for the rationale.
85 */
86static struct destroy_completion_handler {
87 struct cmd_completion_handler handler;
88 char shm_path[member_sizeof(struct ltt_session, shm_path)];
89} destroy_completion_handler = {
90 .handler = {
91 .run = wait_on_path,
92 .data = destroy_completion_handler.shm_path
93 },
94 .shm_path = { 0 },
95};
96
97static struct cmd_completion_handler *current_completion_handler;
98
2f77fc4b
DG
99/*
100 * Used to keep a unique index for each relayd socket created where this value
101 * is associated with streams on the consumer so it can match the right relayd
d88aee68
DG
102 * to send to. It must be accessed with the relayd_net_seq_idx_lock
103 * held.
2f77fc4b 104 */
d88aee68
DG
105static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
106static uint64_t relayd_net_seq_idx;
2f77fc4b 107
7076b56e
JG
108static int validate_ust_event_name(const char *);
109static int cmd_enable_event_internal(struct ltt_session *session,
110 struct lttng_domain *domain,
111 char *channel_name, struct lttng_event *event,
112 char *filter_expression,
113 struct lttng_filter_bytecode *filter,
114 struct lttng_event_exclusion *exclusion,
115 int wpipe);
116
2f77fc4b
DG
117/*
118 * Create a session path used by list_lttng_sessions for the case that the
119 * session consumer is on the network.
120 */
121static int build_network_session_path(char *dst, size_t size,
122 struct ltt_session *session)
123{
124 int ret, kdata_port, udata_port;
125 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
126 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
127
128 assert(session);
129 assert(dst);
130
131 memset(tmp_urls, 0, sizeof(tmp_urls));
132 memset(tmp_uurl, 0, sizeof(tmp_uurl));
133
134 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
135
136 if (session->kernel_session && session->kernel_session->consumer) {
137 kuri = &session->kernel_session->consumer->dst.net.control;
138 kdata_port = session->kernel_session->consumer->dst.net.data.port;
139 }
140
141 if (session->ust_session && session->ust_session->consumer) {
142 uuri = &session->ust_session->consumer->dst.net.control;
143 udata_port = session->ust_session->consumer->dst.net.data.port;
144 }
145
146 if (uuri == NULL && kuri == NULL) {
147 uri = &session->consumer->dst.net.control;
148 kdata_port = session->consumer->dst.net.data.port;
149 } else if (kuri && uuri) {
150 ret = uri_compare(kuri, uuri);
151 if (ret) {
152 /* Not Equal */
153 uri = kuri;
154 /* Build uuri URL string */
155 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
156 if (ret < 0) {
157 goto error;
158 }
159 } else {
160 uri = kuri;
161 }
162 } else if (kuri && uuri == NULL) {
163 uri = kuri;
164 } else if (uuri && kuri == NULL) {
165 uri = uuri;
166 }
167
168 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
169 if (ret < 0) {
170 goto error;
171 }
172
9aa9f900
DG
173 /*
174 * Do we have a UST url set. If yes, this means we have both kernel and UST
175 * to print.
176 */
9d035200 177 if (*tmp_uurl != '\0') {
2f77fc4b
DG
178 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
179 tmp_urls, kdata_port, tmp_uurl, udata_port);
180 } else {
9aa9f900 181 int dport;
bef08707 182 if (kuri || (!kuri && !uuri)) {
9aa9f900
DG
183 dport = kdata_port;
184 } else {
185 /* No kernel URI, use the UST port. */
186 dport = udata_port;
187 }
188 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
2f77fc4b
DG
189 }
190
191error:
192 return ret;
193}
194
fb83fe64
JD
195/*
196 * Get run-time attributes if the session has been started (discarded events,
197 * lost packets).
198 */
199static int get_kernel_runtime_stats(struct ltt_session *session,
200 struct ltt_kernel_channel *kchan, uint64_t *discarded_events,
201 uint64_t *lost_packets)
202{
203 int ret;
204
205 if (!session->has_been_started) {
206 ret = 0;
207 *discarded_events = 0;
208 *lost_packets = 0;
209 goto end;
210 }
211
e1f3997a 212 ret = consumer_get_discarded_events(session->id, kchan->key,
fb83fe64
JD
213 session->kernel_session->consumer,
214 discarded_events);
215 if (ret < 0) {
216 goto end;
217 }
218
e1f3997a 219 ret = consumer_get_lost_packets(session->id, kchan->key,
fb83fe64
JD
220 session->kernel_session->consumer,
221 lost_packets);
222 if (ret < 0) {
223 goto end;
224 }
225
226end:
227 return ret;
228}
229
230/*
231 * Get run-time attributes if the session has been started (discarded events,
232 * lost packets).
233 */
234static int get_ust_runtime_stats(struct ltt_session *session,
235 struct ltt_ust_channel *uchan, uint64_t *discarded_events,
236 uint64_t *lost_packets)
237{
238 int ret;
239 struct ltt_ust_session *usess;
240
a91c5803
JG
241 if (!discarded_events || !lost_packets) {
242 ret = -1;
243 goto end;
244 }
245
fb83fe64 246 usess = session->ust_session;
a905c624
JG
247 assert(discarded_events);
248 assert(lost_packets);
fb83fe64
JD
249
250 if (!usess || !session->has_been_started) {
251 *discarded_events = 0;
252 *lost_packets = 0;
253 ret = 0;
254 goto end;
255 }
256
257 if (usess->buffer_type == LTTNG_BUFFER_PER_UID) {
258 ret = ust_app_uid_get_channel_runtime_stats(usess->id,
259 &usess->buffer_reg_uid_list,
260 usess->consumer, uchan->id,
261 uchan->attr.overwrite,
262 discarded_events,
263 lost_packets);
264 } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) {
265 ret = ust_app_pid_get_channel_runtime_stats(usess,
266 uchan, usess->consumer,
267 uchan->attr.overwrite,
268 discarded_events,
269 lost_packets);
270 if (ret < 0) {
271 goto end;
272 }
273 *discarded_events += uchan->per_pid_closed_app_discarded;
274 *lost_packets += uchan->per_pid_closed_app_lost;
275 } else {
276 ERR("Unsupported buffer type");
967bc289 277 assert(0);
fb83fe64
JD
278 ret = -1;
279 goto end;
280 }
281
282end:
283 return ret;
284}
285
2f77fc4b
DG
286/*
287 * Fill lttng_channel array of all channels.
288 */
d449df4a 289static ssize_t list_lttng_channels(enum lttng_domain_type domain,
fb83fe64 290 struct ltt_session *session, struct lttng_channel *channels,
cf0bcb51 291 struct lttng_channel_extended *chan_exts)
2f77fc4b 292{
d449df4a 293 int i = 0, ret = 0;
2f77fc4b
DG
294 struct ltt_kernel_channel *kchan;
295
296 DBG("Listing channels for session %s", session->name);
297
298 switch (domain) {
299 case LTTNG_DOMAIN_KERNEL:
300 /* Kernel channels */
301 if (session->kernel_session != NULL) {
302 cds_list_for_each_entry(kchan,
303 &session->kernel_session->channel_list.head, list) {
fb83fe64 304 uint64_t discarded_events, lost_packets;
cf0bcb51
JG
305 struct lttng_channel_extended *extended;
306
307 extended = (struct lttng_channel_extended *)
308 kchan->channel->attr.extended.ptr;
fb83fe64
JD
309
310 ret = get_kernel_runtime_stats(session, kchan,
311 &discarded_events, &lost_packets);
312 if (ret < 0) {
313 goto end;
314 }
2f77fc4b
DG
315 /* Copy lttng_channel struct to array */
316 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
317 channels[i].enabled = kchan->enabled;
fb83fe64
JD
318 chan_exts[i].discarded_events =
319 discarded_events;
320 chan_exts[i].lost_packets = lost_packets;
cf0bcb51
JG
321 chan_exts[i].monitor_timer_interval =
322 extended->monitor_timer_interval;
491d1539 323 chan_exts[i].blocking_timeout = 0;
2f77fc4b
DG
324 i++;
325 }
326 }
327 break;
328 case LTTNG_DOMAIN_UST:
329 {
330 struct lttng_ht_iter iter;
331 struct ltt_ust_channel *uchan;
332
e7fe706f 333 rcu_read_lock();
2f77fc4b
DG
334 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
335 &iter.iter, uchan, node.node) {
a91c5803 336 uint64_t discarded_events = 0, lost_packets = 0;
fb83fe64 337
8ee609c8
MD
338 if (lttng_strncpy(channels[i].name, uchan->name,
339 LTTNG_SYMBOL_NAME_LEN)) {
340 break;
341 }
2f77fc4b
DG
342 channels[i].attr.overwrite = uchan->attr.overwrite;
343 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
344 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
345 channels[i].attr.switch_timer_interval =
346 uchan->attr.switch_timer_interval;
347 channels[i].attr.read_timer_interval =
348 uchan->attr.read_timer_interval;
349 channels[i].enabled = uchan->enabled;
2f785fe7
DG
350 channels[i].attr.tracefile_size = uchan->tracefile_size;
351 channels[i].attr.tracefile_count = uchan->tracefile_count;
5e4435a4
JG
352
353 /*
354 * Map enum lttng_ust_output to enum lttng_event_output.
355 */
2f77fc4b
DG
356 switch (uchan->attr.output) {
357 case LTTNG_UST_MMAP:
2f77fc4b
DG
358 channels[i].attr.output = LTTNG_EVENT_MMAP;
359 break;
5e4435a4
JG
360 default:
361 /*
362 * LTTNG_UST_MMAP is the only supported UST
363 * output mode.
364 */
365 assert(0);
366 break;
2f77fc4b 367 }
fb83fe64 368
d449df4a
MD
369 chan_exts[i].monitor_timer_interval =
370 uchan->monitor_timer_interval;
491d1539
MD
371 chan_exts[i].blocking_timeout =
372 uchan->attr.u.s.blocking_timeout;
d449df4a 373
fb83fe64
JD
374 ret = get_ust_runtime_stats(session, uchan,
375 &discarded_events, &lost_packets);
376 if (ret < 0) {
377 break;
378 }
379 chan_exts[i].discarded_events = discarded_events;
380 chan_exts[i].lost_packets = lost_packets;
2f77fc4b
DG
381 i++;
382 }
e7fe706f 383 rcu_read_unlock();
2f77fc4b
DG
384 break;
385 }
386 default:
387 break;
388 }
fb83fe64
JD
389
390end:
d449df4a
MD
391 if (ret < 0) {
392 return -LTTNG_ERR_FATAL;
393 } else {
394 return LTTNG_OK;
395 }
2f77fc4b
DG
396}
397
3c02e545
FD
398static int increment_extended_len(const char *filter_expression,
399 struct lttng_event_exclusion *exclusion,
400 const struct lttng_userspace_probe_location *probe_location,
401 size_t *extended_len)
b4e3ceb9 402{
3c02e545
FD
403 int ret = 0;
404
b4e3ceb9
PP
405 *extended_len += sizeof(struct lttcomm_event_extended_header);
406
407 if (filter_expression) {
408 *extended_len += strlen(filter_expression) + 1;
409 }
795d57ce
PP
410
411 if (exclusion) {
412 *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN;
413 }
3c02e545
FD
414
415 if (probe_location) {
416 ret = lttng_userspace_probe_location_serialize(probe_location,
417 NULL, NULL);
418 if (ret < 0) {
419 goto end;
420 }
421 *extended_len += ret;
422 }
423 ret = 0;
424end:
425 return ret;
b4e3ceb9
PP
426}
427
3c02e545
FD
428static int append_extended_info(const char *filter_expression,
429 struct lttng_event_exclusion *exclusion,
430 struct lttng_userspace_probe_location *probe_location,
431 void **extended_at)
b4e3ceb9 432{
3c02e545 433 int ret = 0;
b4e3ceb9 434 size_t filter_len = 0;
795d57ce 435 size_t nb_exclusions = 0;
3c02e545
FD
436 size_t userspace_probe_location_len = 0;
437 struct lttng_dynamic_buffer location_buffer;
438 struct lttcomm_event_extended_header extended_header;
b4e3ceb9
PP
439
440 if (filter_expression) {
441 filter_len = strlen(filter_expression) + 1;
442 }
443
795d57ce
PP
444 if (exclusion) {
445 nb_exclusions = exclusion->count;
446 }
447
3c02e545
FD
448 if (probe_location) {
449 lttng_dynamic_buffer_init(&location_buffer);
450 ret = lttng_userspace_probe_location_serialize(probe_location,
451 &location_buffer, NULL);
452 if (ret < 0) {
453 ret = -1;
454 goto end;
455 }
456 userspace_probe_location_len = location_buffer.size;
457 }
458
795d57ce 459 /* Set header fields */
b4e3ceb9 460 extended_header.filter_len = filter_len;
795d57ce 461 extended_header.nb_exclusions = nb_exclusions;
3c02e545 462 extended_header.userspace_probe_location_len = userspace_probe_location_len;
795d57ce
PP
463
464 /* Copy header */
b4e3ceb9
PP
465 memcpy(*extended_at, &extended_header, sizeof(extended_header));
466 *extended_at += sizeof(extended_header);
795d57ce
PP
467
468 /* Copy filter string */
469 if (filter_expression) {
470 memcpy(*extended_at, filter_expression, filter_len);
471 *extended_at += filter_len;
472 }
473
474 /* Copy exclusion names */
475 if (exclusion) {
476 size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
477
478 memcpy(*extended_at, &exclusion->names, len);
479 *extended_at += len;
480 }
3c02e545
FD
481
482 if (probe_location) {
483 memcpy(*extended_at, location_buffer.data, location_buffer.size);
484 *extended_at += location_buffer.size;
485 lttng_dynamic_buffer_reset(&location_buffer);
486 }
487 ret = 0;
488end:
489 return ret;
b4e3ceb9
PP
490}
491
3c6a091f 492/*
022d91ba 493 * Create a list of agent domain events.
3c6a091f
DG
494 *
495 * Return number of events in list on success or else a negative value.
496 */
022d91ba 497static int list_lttng_agent_events(struct agent *agt,
b4e3ceb9 498 struct lttng_event **events, size_t *total_size)
3c6a091f
DG
499{
500 int i = 0, ret = 0;
501 unsigned int nb_event = 0;
022d91ba 502 struct agent_event *event;
47e52862 503 struct lttng_event *tmp_events = NULL;
3c6a091f 504 struct lttng_ht_iter iter;
b4e3ceb9
PP
505 size_t extended_len = 0;
506 void *extended_at;
3c6a091f 507
022d91ba 508 assert(agt);
3c6a091f
DG
509 assert(events);
510
022d91ba 511 DBG3("Listing agent events");
3c6a091f 512
e5bbf678 513 rcu_read_lock();
022d91ba 514 nb_event = lttng_ht_get_count(agt->events);
e5bbf678 515 rcu_read_unlock();
3c6a091f
DG
516 if (nb_event == 0) {
517 ret = nb_event;
b4e3ceb9 518 *total_size = 0;
3c6a091f
DG
519 goto error;
520 }
521
b4e3ceb9
PP
522 /* Compute required extended infos size */
523 extended_len = nb_event * sizeof(struct lttcomm_event_extended_header);
524
525 /*
526 * This is only valid because the commands which add events are
527 * processed in the same thread as the listing.
528 */
529 rcu_read_lock();
530 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
3c02e545 531 ret = increment_extended_len(event->filter_expression, NULL, NULL,
795d57ce 532 &extended_len);
3c02e545
FD
533 if (ret) {
534 DBG("Error computing the length of extended info message");
535 ret = -LTTNG_ERR_FATAL;
536 goto error;
537 }
b4e3ceb9
PP
538 }
539 rcu_read_unlock();
540
541 *total_size = nb_event * sizeof(*tmp_events) + extended_len;
542 tmp_events = zmalloc(*total_size);
3c6a091f 543 if (!tmp_events) {
022d91ba 544 PERROR("zmalloc agent events session");
3c6a091f
DG
545 ret = -LTTNG_ERR_FATAL;
546 goto error;
547 }
548
b4e3ceb9
PP
549 extended_at = ((uint8_t *) tmp_events) +
550 nb_event * sizeof(struct lttng_event);
551
3c6a091f 552 rcu_read_lock();
022d91ba 553 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
3c6a091f
DG
554 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
555 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
556 tmp_events[i].enabled = event->enabled;
2106efa0 557 tmp_events[i].loglevel = event->loglevel_value;
ff94328f 558 tmp_events[i].loglevel_type = event->loglevel_type;
3c6a091f 559 i++;
b4e3ceb9
PP
560
561 /* Append extended info */
3c02e545 562 ret = append_extended_info(event->filter_expression, NULL, NULL,
795d57ce 563 &extended_at);
3c02e545
FD
564 if (ret) {
565 DBG("Error appending extended info message");
566 ret = -LTTNG_ERR_FATAL;
567 goto error;
568 }
3c6a091f 569 }
3c6a091f
DG
570
571 *events = tmp_events;
572 ret = nb_event;
3c02e545 573 assert(nb_event == i);
3c6a091f 574
47e52862 575end:
3c02e545 576 rcu_read_unlock();
3c6a091f 577 return ret;
47e52862
JG
578error:
579 free(tmp_events);
580 goto end;
3c6a091f
DG
581}
582
2f77fc4b
DG
583/*
584 * Create a list of ust global domain events.
585 */
586static int list_lttng_ust_global_events(char *channel_name,
b4e3ceb9
PP
587 struct ltt_ust_domain_global *ust_global,
588 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
589{
590 int i = 0, ret = 0;
591 unsigned int nb_event = 0;
592 struct lttng_ht_iter iter;
593 struct lttng_ht_node_str *node;
594 struct ltt_ust_channel *uchan;
595 struct ltt_ust_event *uevent;
596 struct lttng_event *tmp;
b4e3ceb9
PP
597 size_t extended_len = 0;
598 void *extended_at;
2f77fc4b
DG
599
600 DBG("Listing UST global events for channel %s", channel_name);
601
602 rcu_read_lock();
603
604 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
605 node = lttng_ht_iter_get_node_str(&iter);
606 if (node == NULL) {
f73fabfd 607 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
d31d3e8c 608 goto end;
2f77fc4b
DG
609 }
610
611 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
612
3c442be3 613 nb_event = lttng_ht_get_count(uchan->events);
2f77fc4b
DG
614 if (nb_event == 0) {
615 ret = nb_event;
b4e3ceb9 616 *total_size = 0;
d31d3e8c 617 goto end;
2f77fc4b
DG
618 }
619
620 DBG3("Listing UST global %d events", nb_event);
621
b4e3ceb9
PP
622 /* Compute required extended infos size */
623 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
624 if (uevent->internal) {
625 nb_event--;
626 continue;
627 }
628
3c02e545
FD
629 ret = increment_extended_len(uevent->filter_expression,
630 uevent->exclusion, NULL, &extended_len);
631 if (ret) {
632 DBG("Error computing the length of extended info message");
633 ret = -LTTNG_ERR_FATAL;
634 goto end;
635 }
b4e3ceb9 636 }
d31d3e8c
PP
637 if (nb_event == 0) {
638 /* All events are internal, skip. */
639 ret = 0;
640 *total_size = 0;
641 goto end;
642 }
b4e3ceb9
PP
643
644 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
645 tmp = zmalloc(*total_size);
2f77fc4b 646 if (tmp == NULL) {
b12c38df
JG
647 ret = -LTTNG_ERR_FATAL;
648 goto end;
2f77fc4b
DG
649 }
650
b4e3ceb9
PP
651 extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event);
652
2f77fc4b 653 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
3c442be3
JG
654 if (uevent->internal) {
655 /* This event should remain hidden from clients */
3c442be3
JG
656 continue;
657 }
2f77fc4b
DG
658 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
659 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
660 tmp[i].enabled = uevent->enabled;
661
662 switch (uevent->attr.instrumentation) {
663 case LTTNG_UST_TRACEPOINT:
664 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
665 break;
666 case LTTNG_UST_PROBE:
667 tmp[i].type = LTTNG_EVENT_PROBE;
668 break;
669 case LTTNG_UST_FUNCTION:
670 tmp[i].type = LTTNG_EVENT_FUNCTION;
671 break;
672 }
673
674 tmp[i].loglevel = uevent->attr.loglevel;
675 switch (uevent->attr.loglevel_type) {
676 case LTTNG_UST_LOGLEVEL_ALL:
677 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
678 break;
679 case LTTNG_UST_LOGLEVEL_RANGE:
680 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
681 break;
682 case LTTNG_UST_LOGLEVEL_SINGLE:
683 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
684 break;
685 }
686 if (uevent->filter) {
687 tmp[i].filter = 1;
688 }
4634f12e
JI
689 if (uevent->exclusion) {
690 tmp[i].exclusion = 1;
691 }
2f77fc4b 692 i++;
b4e3ceb9
PP
693
694 /* Append extended info */
3c02e545
FD
695 ret = append_extended_info(uevent->filter_expression,
696 uevent->exclusion, NULL, &extended_at);
697 if (ret) {
698 DBG("Error appending extended info message");
699 ret = -LTTNG_ERR_FATAL;
700 goto end;
701 }
2f77fc4b
DG
702 }
703
704 ret = nb_event;
705 *events = tmp;
d31d3e8c 706end:
2f77fc4b
DG
707 rcu_read_unlock();
708 return ret;
709}
710
711/*
712 * Fill lttng_event array of all kernel events in the channel.
713 */
714static int list_lttng_kernel_events(char *channel_name,
b4e3ceb9
PP
715 struct ltt_kernel_session *kernel_session,
716 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
717{
718 int i = 0, ret;
719 unsigned int nb_event;
720 struct ltt_kernel_event *event;
721 struct ltt_kernel_channel *kchan;
b4e3ceb9
PP
722 size_t extended_len = 0;
723 void *extended_at;
2f77fc4b
DG
724
725 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
726 if (kchan == NULL) {
f73fabfd 727 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG
728 goto error;
729 }
730
731 nb_event = kchan->event_count;
732
733 DBG("Listing events for channel %s", kchan->channel->name);
734
735 if (nb_event == 0) {
b4e3ceb9 736 *total_size = 0;
834978fd 737 *events = NULL;
db906c12 738 goto end;
2f77fc4b
DG
739 }
740
b4e3ceb9
PP
741 /* Compute required extended infos size */
742 cds_list_for_each_entry(event, &kchan->events_list.head, list) {
3c02e545
FD
743 ret = increment_extended_len(event->filter_expression, NULL,
744 event->userspace_probe_location,
795d57ce 745 &extended_len);
3c02e545
FD
746 if (ret) {
747 DBG("Error computing the length of extended info message");
748 ret = -LTTNG_ERR_FATAL;
749 goto error;
750 }
b4e3ceb9
PP
751 }
752
753 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
754 *events = zmalloc(*total_size);
2f77fc4b 755 if (*events == NULL) {
3c02e545 756 ret = -LTTNG_ERR_FATAL;
2f77fc4b
DG
757 goto error;
758 }
759
ab4aa612 760 extended_at = ((void *) *events) +
b4e3ceb9
PP
761 nb_event * sizeof(struct lttng_event);
762
2f77fc4b
DG
763 /* Kernel channels */
764 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
765 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
766 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
767 (*events)[i].enabled = event->enabled;
00f992f2
JG
768 (*events)[i].filter =
769 (unsigned char) !!event->filter_expression;
2f77fc4b
DG
770
771 switch (event->event->instrumentation) {
772 case LTTNG_KERNEL_TRACEPOINT:
773 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
774 break;
2f77fc4b 775 case LTTNG_KERNEL_KRETPROBE:
1896972b
DG
776 (*events)[i].type = LTTNG_EVENT_FUNCTION;
777 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
778 sizeof(struct lttng_kernel_kprobe));
779 break;
780 case LTTNG_KERNEL_KPROBE:
2f77fc4b
DG
781 (*events)[i].type = LTTNG_EVENT_PROBE;
782 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
783 sizeof(struct lttng_kernel_kprobe));
784 break;
b955b4d4
FD
785 case LTTNG_KERNEL_UPROBE:
786 (*events)[i].type = LTTNG_EVENT_USERSPACE_PROBE;
787 break;
2f77fc4b
DG
788 case LTTNG_KERNEL_FUNCTION:
789 (*events)[i].type = LTTNG_EVENT_FUNCTION;
790 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
791 sizeof(struct lttng_kernel_function));
792 break;
793 case LTTNG_KERNEL_NOOP:
794 (*events)[i].type = LTTNG_EVENT_NOOP;
795 break;
796 case LTTNG_KERNEL_SYSCALL:
797 (*events)[i].type = LTTNG_EVENT_SYSCALL;
798 break;
799 case LTTNG_KERNEL_ALL:
1ab8c2ad
FD
800 /* fall-through. */
801 default:
2f77fc4b
DG
802 assert(0);
803 break;
804 }
805 i++;
b4e3ceb9
PP
806
807 /* Append extended info */
3c02e545
FD
808 ret = append_extended_info(event->filter_expression, NULL,
809 event->userspace_probe_location, &extended_at);
810 if (ret) {
811 DBG("Error appending extended info message");
812 ret = -LTTNG_ERR_FATAL;
813 goto error;
814 }
2f77fc4b
DG
815 }
816
db906c12 817end:
2f77fc4b
DG
818 return nb_event;
819
820error:
f73fabfd
DG
821 /* Negate the error code to differentiate the size from an error */
822 return -ret;
2f77fc4b
DG
823}
824
825/*
826 * Add URI so the consumer output object. Set the correct path depending on the
827 * domain adding the default trace directory.
828 */
b178f53e
JG
829static enum lttng_error_code add_uri_to_consumer(
830 const struct ltt_session *session,
831 struct consumer_output *consumer,
832 struct lttng_uri *uri, enum lttng_domain_type domain)
2f77fc4b 833{
b178f53e
JG
834 int ret;
835 enum lttng_error_code ret_code = LTTNG_OK;
2f77fc4b
DG
836
837 assert(uri);
838
839 if (consumer == NULL) {
840 DBG("No consumer detected. Don't add URI. Stopping.");
b178f53e 841 ret_code = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
842 goto error;
843 }
844
845 switch (domain) {
846 case LTTNG_DOMAIN_KERNEL:
b178f53e
JG
847 ret = lttng_strncpy(consumer->domain_subdir,
848 DEFAULT_KERNEL_TRACE_DIR,
849 sizeof(consumer->domain_subdir));
2f77fc4b
DG
850 break;
851 case LTTNG_DOMAIN_UST:
b178f53e
JG
852 ret = lttng_strncpy(consumer->domain_subdir,
853 DEFAULT_UST_TRACE_DIR,
854 sizeof(consumer->domain_subdir));
2f77fc4b
DG
855 break;
856 default:
857 /*
b178f53e
JG
858 * This case is possible is we try to add the URI to the global
859 * tracing session consumer object which in this case there is
860 * no subdir.
2f77fc4b 861 */
b178f53e
JG
862 memset(consumer->domain_subdir, 0,
863 sizeof(consumer->domain_subdir));
864 ret = 0;
865 }
866 if (ret) {
867 ERR("Failed to initialize consumer output domain subdirectory");
868 ret_code = LTTNG_ERR_FATAL;
869 goto error;
2f77fc4b
DG
870 }
871
872 switch (uri->dtype) {
873 case LTTNG_DST_IPV4:
874 case LTTNG_DST_IPV6:
875 DBG2("Setting network URI to consumer");
876
df75acac
DG
877 if (consumer->type == CONSUMER_DST_NET) {
878 if ((uri->stype == LTTNG_STREAM_CONTROL &&
785d2d0d
DG
879 consumer->dst.net.control_isset) ||
880 (uri->stype == LTTNG_STREAM_DATA &&
881 consumer->dst.net.data_isset)) {
b178f53e 882 ret_code = LTTNG_ERR_URL_EXIST;
df75acac
DG
883 goto error;
884 }
885 } else {
b178f53e 886 memset(&consumer->dst, 0, sizeof(consumer->dst));
785d2d0d
DG
887 }
888
2f77fc4b 889 /* Set URI into consumer output object */
b178f53e 890 ret = consumer_set_network_uri(session, consumer, uri);
2f77fc4b 891 if (ret < 0) {
b178f53e 892 ret_code = -ret;
2f77fc4b
DG
893 goto error;
894 } else if (ret == 1) {
895 /*
896 * URI was the same in the consumer so we do not append the subdir
897 * again so to not duplicate output dir.
898 */
b178f53e 899 ret_code = LTTNG_OK;
2f77fc4b
DG
900 goto error;
901 }
2f77fc4b
DG
902 break;
903 case LTTNG_DST_PATH:
b178f53e
JG
904 if (*uri->dst.path != '/' || strstr(uri->dst.path, "../")) {
905 ret_code = LTTNG_ERR_INVALID;
9ac05d92
MD
906 goto error;
907 }
b178f53e
JG
908 DBG2("Setting trace directory path from URI to %s",
909 uri->dst.path);
910 memset(&consumer->dst, 0, sizeof(consumer->dst));
911
912 ret = lttng_strncpy(consumer->dst.session_root_path,
913 uri->dst.path,
914 sizeof(consumer->dst.session_root_path));
4df41cad
JG
915 if (ret) {
916 ret_code = LTTNG_ERR_FATAL;
917 goto error;
918 }
2f77fc4b
DG
919 consumer->type = CONSUMER_DST_LOCAL;
920 break;
921 }
922
b178f53e 923 ret_code = LTTNG_OK;
2f77fc4b 924error:
b178f53e 925 return ret_code;
2f77fc4b
DG
926}
927
928/*
929 * Init tracing by creating trace directory and sending fds kernel consumer.
930 */
931static int init_kernel_tracing(struct ltt_kernel_session *session)
932{
933 int ret = 0;
934 struct lttng_ht_iter iter;
935 struct consumer_socket *socket;
936
937 assert(session);
938
e7fe706f
DG
939 rcu_read_lock();
940
2f77fc4b
DG
941 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
942 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
943 socket, node.node) {
2f77fc4b 944 pthread_mutex_lock(socket->lock);
f50f23d9 945 ret = kernel_consumer_send_session(socket, session);
2f77fc4b
DG
946 pthread_mutex_unlock(socket->lock);
947 if (ret < 0) {
f73fabfd 948 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
949 goto error;
950 }
951 }
952 }
953
954error:
e7fe706f 955 rcu_read_unlock();
2f77fc4b
DG
956 return ret;
957}
958
959/*
960 * Create a socket to the relayd using the URI.
961 *
962 * On success, the relayd_sock pointer is set to the created socket.
9a654598 963 * Else, it remains untouched and an LTTng error code is returned.
2f77fc4b 964 */
9a654598 965static enum lttng_error_code create_connect_relayd(struct lttng_uri *uri,
b31610f2
JD
966 struct lttcomm_relayd_sock **relayd_sock,
967 struct consumer_output *consumer)
2f77fc4b
DG
968{
969 int ret;
9a654598 970 enum lttng_error_code status = LTTNG_OK;
6151a90f 971 struct lttcomm_relayd_sock *rsock;
2f77fc4b 972
6151a90f
JD
973 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
974 RELAYD_VERSION_COMM_MINOR);
975 if (!rsock) {
9a654598 976 status = LTTNG_ERR_FATAL;
2f77fc4b
DG
977 goto error;
978 }
979
ffe60014
DG
980 /*
981 * Connect to relayd so we can proceed with a session creation. This call
982 * can possibly block for an arbitrary amount of time to set the health
983 * state to be in poll execution.
984 */
985 health_poll_entry();
6151a90f 986 ret = relayd_connect(rsock);
ffe60014 987 health_poll_exit();
2f77fc4b
DG
988 if (ret < 0) {
989 ERR("Unable to reach lttng-relayd");
9a654598 990 status = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG
991 goto free_sock;
992 }
993
994 /* Create socket for control stream. */
995 if (uri->stype == LTTNG_STREAM_CONTROL) {
996 DBG3("Creating relayd stream socket from URI");
997
998 /* Check relayd version */
6151a90f 999 ret = relayd_version_check(rsock);
67d5aa28 1000 if (ret == LTTNG_ERR_RELAYD_VERSION_FAIL) {
9a654598 1001 status = LTTNG_ERR_RELAYD_VERSION_FAIL;
67d5aa28
JD
1002 goto close_sock;
1003 } else if (ret < 0) {
1004 ERR("Unable to reach lttng-relayd");
9a654598 1005 status = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG
1006 goto close_sock;
1007 }
b31610f2
JD
1008 consumer->relay_major_version = rsock->major;
1009 consumer->relay_minor_version = rsock->minor;
2f77fc4b
DG
1010 } else if (uri->stype == LTTNG_STREAM_DATA) {
1011 DBG3("Creating relayd data socket from URI");
1012 } else {
1013 /* Command is not valid */
1014 ERR("Relayd invalid stream type: %d", uri->stype);
9a654598 1015 status = LTTNG_ERR_INVALID;
2f77fc4b
DG
1016 goto close_sock;
1017 }
1018
6151a90f 1019 *relayd_sock = rsock;
2f77fc4b 1020
9a654598 1021 return status;
2f77fc4b
DG
1022
1023close_sock:
6151a90f
JD
1024 /* The returned value is not useful since we are on an error path. */
1025 (void) relayd_close(rsock);
2f77fc4b 1026free_sock:
6151a90f 1027 free(rsock);
2f77fc4b 1028error:
9a654598 1029 return status;
2f77fc4b
DG
1030}
1031
1032/*
1033 * Connect to the relayd using URI and send the socket to the right consumer.
43fade62
JG
1034 *
1035 * The consumer socket lock must be held by the caller.
9a654598
JG
1036 *
1037 * Returns LTTNG_OK on success or an LTTng error code on failure.
2f77fc4b 1038 */
9a654598
JG
1039static enum lttng_error_code send_consumer_relayd_socket(
1040 unsigned int session_id,
3044f922 1041 struct lttng_uri *relayd_uri,
56a37563 1042 struct consumer_output *consumer,
d3e2ba59 1043 struct consumer_socket *consumer_sock,
fb9a95c4 1044 const char *session_name, const char *hostname,
6fa5fe7c 1045 const char *base_path, int session_live_timer,
db1da059 1046 const uint64_t *current_chunk_id,
46ef2188
MD
1047 time_t session_creation_time,
1048 bool session_name_contains_creation_time)
2f77fc4b
DG
1049{
1050 int ret;
6151a90f 1051 struct lttcomm_relayd_sock *rsock = NULL;
9a654598 1052 enum lttng_error_code status;
2f77fc4b 1053
ffe60014 1054 /* Connect to relayd and make version check if uri is the control. */
9a654598
JG
1055 status = create_connect_relayd(relayd_uri, &rsock, consumer);
1056 if (status != LTTNG_OK) {
9e218353 1057 goto relayd_comm_error;
ffe60014 1058 }
6151a90f 1059 assert(rsock);
ffe60014 1060
2f77fc4b 1061 /* Set the network sequence index if not set. */
d88aee68
DG
1062 if (consumer->net_seq_index == (uint64_t) -1ULL) {
1063 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
1064 /*
1065 * Increment net_seq_idx because we are about to transfer the
1066 * new relayd socket to the consumer.
d88aee68 1067 * Assign unique key so the consumer can match streams.
2f77fc4b 1068 */
d88aee68
DG
1069 consumer->net_seq_index = ++relayd_net_seq_idx;
1070 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
1071 }
1072
2f77fc4b 1073 /* Send relayd socket to consumer. */
6151a90f 1074 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
d3e2ba59 1075 relayd_uri->stype, session_id,
6fa5fe7c
MD
1076 session_name, hostname, base_path,
1077 session_live_timer, current_chunk_id,
46ef2188 1078 session_creation_time, session_name_contains_creation_time);
2f77fc4b 1079 if (ret < 0) {
9a654598 1080 status = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
1081 goto close_sock;
1082 }
1083
c890b720
DG
1084 /* Flag that the corresponding socket was sent. */
1085 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
ffe60014 1086 consumer_sock->control_sock_sent = 1;
c890b720 1087 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
ffe60014 1088 consumer_sock->data_sock_sent = 1;
c890b720
DG
1089 }
1090
2f77fc4b
DG
1091 /*
1092 * Close socket which was dup on the consumer side. The session daemon does
1093 * NOT keep track of the relayd socket(s) once transfer to the consumer.
1094 */
1095
1096close_sock:
9a654598 1097 if (status != LTTNG_OK) {
ffe60014 1098 /*
d9078d0c
DG
1099 * The consumer output for this session should not be used anymore
1100 * since the relayd connection failed thus making any tracing or/and
1101 * streaming not usable.
ffe60014 1102 */
d9078d0c 1103 consumer->enabled = 0;
ffe60014 1104 }
9e218353
JR
1105 (void) relayd_close(rsock);
1106 free(rsock);
1107
1108relayd_comm_error:
9a654598 1109 return status;
2f77fc4b
DG
1110}
1111
1112/*
1113 * Send both relayd sockets to a specific consumer and domain. This is a
1114 * helper function to facilitate sending the information to the consumer for a
1115 * session.
43fade62
JG
1116 *
1117 * The consumer socket lock must be held by the caller.
9a654598
JG
1118 *
1119 * Returns LTTNG_OK, or an LTTng error code on failure.
2f77fc4b 1120 */
9a654598
JG
1121static enum lttng_error_code send_consumer_relayd_sockets(
1122 enum lttng_domain_type domain,
56a37563 1123 unsigned int session_id, struct consumer_output *consumer,
fb9a95c4 1124 struct consumer_socket *sock, const char *session_name,
6fa5fe7c 1125 const char *hostname, const char *base_path, int session_live_timer,
46ef2188
MD
1126 const uint64_t *current_chunk_id, time_t session_creation_time,
1127 bool session_name_contains_creation_time)
2f77fc4b 1128{
9a654598 1129 enum lttng_error_code status = LTTNG_OK;
2f77fc4b 1130
2f77fc4b 1131 assert(consumer);
6dc3064a 1132 assert(sock);
2f77fc4b 1133
2f77fc4b 1134 /* Sending control relayd socket. */
ffe60014 1135 if (!sock->control_sock_sent) {
9a654598 1136 status = send_consumer_relayd_socket(session_id,
d3e2ba59 1137 &consumer->dst.net.control, consumer, sock,
6fa5fe7c 1138 session_name, hostname, base_path, session_live_timer,
46ef2188
MD
1139 current_chunk_id, session_creation_time,
1140 session_name_contains_creation_time);
9a654598 1141 if (status != LTTNG_OK) {
c890b720
DG
1142 goto error;
1143 }
2f77fc4b
DG
1144 }
1145
1146 /* Sending data relayd socket. */
ffe60014 1147 if (!sock->data_sock_sent) {
9a654598 1148 status = send_consumer_relayd_socket(session_id,
d3e2ba59 1149 &consumer->dst.net.data, consumer, sock,
6fa5fe7c 1150 session_name, hostname, base_path, session_live_timer,
46ef2188
MD
1151 current_chunk_id, session_creation_time,
1152 session_name_contains_creation_time);
9a654598 1153 if (status != LTTNG_OK) {
c890b720
DG
1154 goto error;
1155 }
2f77fc4b
DG
1156 }
1157
2f77fc4b 1158error:
9a654598 1159 return status;
2f77fc4b
DG
1160}
1161
1162/*
1163 * Setup relayd connections for a tracing session. First creates the socket to
1164 * the relayd and send them to the right domain consumer. Consumer type MUST be
1165 * network.
1166 */
ffe60014 1167int cmd_setup_relayd(struct ltt_session *session)
2f77fc4b 1168{
f73fabfd 1169 int ret = LTTNG_OK;
2f77fc4b
DG
1170 struct ltt_ust_session *usess;
1171 struct ltt_kernel_session *ksess;
1172 struct consumer_socket *socket;
1173 struct lttng_ht_iter iter;
1e791a74 1174 LTTNG_OPTIONAL(uint64_t) current_chunk_id = {};
2f77fc4b 1175
1e791a74 1176 assert(session);
2f77fc4b
DG
1177
1178 usess = session->ust_session;
1179 ksess = session->kernel_session;
1180
785d2d0d 1181 DBG("Setting relayd for session %s", session->name);
2f77fc4b 1182
1e791a74
JG
1183 if (session->current_trace_chunk) {
1184 enum lttng_trace_chunk_status status = lttng_trace_chunk_get_id(
1185 session->current_trace_chunk, &current_chunk_id.value);
1186
1187 if (status == LTTNG_TRACE_CHUNK_STATUS_OK) {
1188 current_chunk_id.is_set = true;
1189 } else {
1190 ERR("Failed to get current trace chunk id");
1191 ret = LTTNG_ERR_UNK;
1192 goto error;
1193 }
1194 }
1195
e7fe706f
DG
1196 rcu_read_lock();
1197
2f77fc4b
DG
1198 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
1199 && usess->consumer->enabled) {
1200 /* For each consumer socket, send relayd sockets */
1201 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
1202 socket, node.node) {
2f77fc4b 1203 pthread_mutex_lock(socket->lock);
6dc3064a 1204 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
d3e2ba59
JD
1205 usess->consumer, socket,
1206 session->name, session->hostname,
6fa5fe7c 1207 session->base_path,
1e791a74 1208 session->live_timer,
db1da059 1209 current_chunk_id.is_set ? &current_chunk_id.value : NULL,
46ef2188
MD
1210 session->creation_time,
1211 session->name_contains_creation_time);
2f77fc4b 1212 pthread_mutex_unlock(socket->lock);
f73fabfd 1213 if (ret != LTTNG_OK) {
2f77fc4b
DG
1214 goto error;
1215 }
6dc3064a
DG
1216 /* Session is now ready for network streaming. */
1217 session->net_handle = 1;
2f77fc4b 1218 }
b31610f2
JD
1219 session->consumer->relay_major_version =
1220 usess->consumer->relay_major_version;
1221 session->consumer->relay_minor_version =
1222 usess->consumer->relay_minor_version;
2f77fc4b
DG
1223 }
1224
1225 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
1226 && ksess->consumer->enabled) {
1227 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
1228 socket, node.node) {
2f77fc4b 1229 pthread_mutex_lock(socket->lock);
6dc3064a 1230 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
d3e2ba59
JD
1231 ksess->consumer, socket,
1232 session->name, session->hostname,
6fa5fe7c 1233 session->base_path,
1e791a74 1234 session->live_timer,
db1da059 1235 current_chunk_id.is_set ? &current_chunk_id.value : NULL,
46ef2188
MD
1236 session->creation_time,
1237 session->name_contains_creation_time);
2f77fc4b 1238 pthread_mutex_unlock(socket->lock);
f73fabfd 1239 if (ret != LTTNG_OK) {
2f77fc4b
DG
1240 goto error;
1241 }
6dc3064a
DG
1242 /* Session is now ready for network streaming. */
1243 session->net_handle = 1;
2f77fc4b 1244 }
b31610f2
JD
1245 session->consumer->relay_major_version =
1246 ksess->consumer->relay_major_version;
1247 session->consumer->relay_minor_version =
1248 ksess->consumer->relay_minor_version;
2f77fc4b
DG
1249 }
1250
1251error:
e7fe706f 1252 rcu_read_unlock();
2f77fc4b
DG
1253 return ret;
1254}
1255
9b6c7ec5
DG
1256/*
1257 * Start a kernel session by opening all necessary streams.
1258 */
7d268848 1259static int start_kernel_session(struct ltt_kernel_session *ksess)
9b6c7ec5
DG
1260{
1261 int ret;
1262 struct ltt_kernel_channel *kchan;
1263
1264 /* Open kernel metadata */
07b86b52 1265 if (ksess->metadata == NULL && ksess->output_traces) {
9b6c7ec5
DG
1266 ret = kernel_open_metadata(ksess);
1267 if (ret < 0) {
1268 ret = LTTNG_ERR_KERN_META_FAIL;
1269 goto error;
1270 }
1271 }
1272
1273 /* Open kernel metadata stream */
07b86b52 1274 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
9b6c7ec5
DG
1275 ret = kernel_open_metadata_stream(ksess);
1276 if (ret < 0) {
1277 ERR("Kernel create metadata stream failed");
1278 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1279 goto error;
1280 }
1281 }
1282
1283 /* For each channel */
1284 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
1285 if (kchan->stream_count == 0) {
1286 ret = kernel_open_channel_stream(kchan);
1287 if (ret < 0) {
1288 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1289 goto error;
1290 }
1291 /* Update the stream global counter */
1292 ksess->stream_count_global += ret;
1293 }
1294 }
1295
1296 /* Setup kernel consumer socket and send fds to it */
1297 ret = init_kernel_tracing(ksess);
e43c41c5 1298 if (ret != 0) {
9b6c7ec5
DG
1299 ret = LTTNG_ERR_KERN_START_FAIL;
1300 goto error;
1301 }
1302
1303 /* This start the kernel tracing */
1304 ret = kernel_start_session(ksess);
1305 if (ret < 0) {
1306 ret = LTTNG_ERR_KERN_START_FAIL;
1307 goto error;
1308 }
1309
1310 /* Quiescent wait after starting trace */
7d268848 1311 kernel_wait_quiescent();
9b6c7ec5 1312
14fb1ebe 1313 ksess->active = 1;
9b6c7ec5
DG
1314
1315 ret = LTTNG_OK;
1316
1317error:
1318 return ret;
1319}
1320
2f77fc4b
DG
1321/*
1322 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1323 */
56a37563
JG
1324int cmd_disable_channel(struct ltt_session *session,
1325 enum lttng_domain_type domain, char *channel_name)
2f77fc4b
DG
1326{
1327 int ret;
1328 struct ltt_ust_session *usess;
1329
1330 usess = session->ust_session;
1331
2223c96f
DG
1332 rcu_read_lock();
1333
2f77fc4b
DG
1334 switch (domain) {
1335 case LTTNG_DOMAIN_KERNEL:
1336 {
1337 ret = channel_kernel_disable(session->kernel_session,
1338 channel_name);
f73fabfd 1339 if (ret != LTTNG_OK) {
2f77fc4b
DG
1340 goto error;
1341 }
1342
7d268848 1343 kernel_wait_quiescent();
2f77fc4b
DG
1344 break;
1345 }
1346 case LTTNG_DOMAIN_UST:
1347 {
1348 struct ltt_ust_channel *uchan;
1349 struct lttng_ht *chan_ht;
1350
1351 chan_ht = usess->domain_global.channels;
1352
1353 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
1354 if (uchan == NULL) {
f73fabfd 1355 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
1356 goto error;
1357 }
1358
7972aab2 1359 ret = channel_ust_disable(usess, uchan);
f73fabfd 1360 if (ret != LTTNG_OK) {
2f77fc4b
DG
1361 goto error;
1362 }
1363 break;
1364 }
2f77fc4b 1365 default:
f73fabfd 1366 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1367 goto error;
1368 }
1369
f73fabfd 1370 ret = LTTNG_OK;
2f77fc4b
DG
1371
1372error:
2223c96f 1373 rcu_read_unlock();
2f77fc4b
DG
1374 return ret;
1375}
1376
ccf10263
MD
1377/*
1378 * Command LTTNG_TRACK_PID processed by the client thread.
a9ad0c8f
MD
1379 *
1380 * Called with session lock held.
ccf10263 1381 */
56a37563
JG
1382int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain,
1383 int pid)
ccf10263
MD
1384{
1385 int ret;
1386
1387 rcu_read_lock();
1388
1389 switch (domain) {
1390 case LTTNG_DOMAIN_KERNEL:
1391 {
1392 struct ltt_kernel_session *ksess;
1393
1394 ksess = session->kernel_session;
1395
1396 ret = kernel_track_pid(ksess, pid);
1397 if (ret != LTTNG_OK) {
1398 goto error;
1399 }
1400
7d268848 1401 kernel_wait_quiescent();
ccf10263
MD
1402 break;
1403 }
ccf10263 1404 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
1405 {
1406 struct ltt_ust_session *usess;
1407
1408 usess = session->ust_session;
1409
1410 ret = trace_ust_track_pid(usess, pid);
1411 if (ret != LTTNG_OK) {
1412 goto error;
1413 }
1414 break;
1415 }
ccf10263
MD
1416 default:
1417 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1418 goto error;
1419 }
1420
1421 ret = LTTNG_OK;
1422
1423error:
1424 rcu_read_unlock();
1425 return ret;
1426}
1427
1428/*
1429 * Command LTTNG_UNTRACK_PID processed by the client thread.
a9ad0c8f
MD
1430 *
1431 * Called with session lock held.
ccf10263 1432 */
56a37563
JG
1433int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain,
1434 int pid)
ccf10263
MD
1435{
1436 int ret;
1437
1438 rcu_read_lock();
1439
1440 switch (domain) {
1441 case LTTNG_DOMAIN_KERNEL:
1442 {
1443 struct ltt_kernel_session *ksess;
1444
1445 ksess = session->kernel_session;
1446
1447 ret = kernel_untrack_pid(ksess, pid);
1448 if (ret != LTTNG_OK) {
1449 goto error;
1450 }
1451
7d268848 1452 kernel_wait_quiescent();
ccf10263
MD
1453 break;
1454 }
ccf10263 1455 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
1456 {
1457 struct ltt_ust_session *usess;
1458
1459 usess = session->ust_session;
1460
1461 ret = trace_ust_untrack_pid(usess, pid);
1462 if (ret != LTTNG_OK) {
1463 goto error;
1464 }
1465 break;
1466 }
ccf10263
MD
1467 default:
1468 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1469 goto error;
1470 }
1471
1472 ret = LTTNG_OK;
1473
1474error:
1475 rcu_read_unlock();
1476 return ret;
1477}
1478
2f77fc4b
DG
1479/*
1480 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1481 *
1482 * The wpipe arguments is used as a notifier for the kernel thread.
1483 */
1484int cmd_enable_channel(struct ltt_session *session,
7972aab2 1485 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
2f77fc4b
DG
1486{
1487 int ret;
1488 struct ltt_ust_session *usess = session->ust_session;
1489 struct lttng_ht *chan_ht;
1f345e94 1490 size_t len;
2f77fc4b
DG
1491
1492 assert(session);
1493 assert(attr);
7972aab2 1494 assert(domain);
2f77fc4b 1495
f5436bfc 1496 len = lttng_strnlen(attr->name, sizeof(attr->name));
1f345e94
PP
1497
1498 /* Validate channel name */
1499 if (attr->name[0] == '.' ||
1500 memchr(attr->name, '/', len) != NULL) {
1501 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1502 goto end;
1503 }
1504
2f77fc4b
DG
1505 DBG("Enabling channel %s for session %s", attr->name, session->name);
1506
03b4fdcf
DG
1507 rcu_read_lock();
1508
ecc48a90
JD
1509 /*
1510 * Don't try to enable a channel if the session has been started at
1511 * some point in time before. The tracer does not allow it.
1512 */
8382cf6f 1513 if (session->has_been_started) {
ecc48a90
JD
1514 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1515 goto error;
1516 }
1517
1518 /*
1519 * If the session is a live session, remove the switch timer, the
1520 * live timer does the same thing but sends also synchronisation
1521 * beacons for inactive streams.
1522 */
1523 if (session->live_timer > 0) {
1524 attr->attr.live_timer_interval = session->live_timer;
1525 attr->attr.switch_timer_interval = 0;
1526 }
1527
6e21424e
JR
1528 /* Check for feature support */
1529 switch (domain->type) {
1530 case LTTNG_DOMAIN_KERNEL:
1531 {
7d268848 1532 if (kernel_supports_ring_buffer_snapshot_sample_positions() != 1) {
6e21424e
JR
1533 /* Sampling position of buffer is not supported */
1534 WARN("Kernel tracer does not support buffer monitoring. "
1535 "Setting the monitor interval timer to 0 "
1536 "(disabled) for channel '%s' of session '%s'",
1537 attr-> name, session->name);
1538 lttng_channel_set_monitor_timer_interval(attr, 0);
1539 }
1540 break;
1541 }
1542 case LTTNG_DOMAIN_UST:
f28f9e44 1543 break;
6e21424e
JR
1544 case LTTNG_DOMAIN_JUL:
1545 case LTTNG_DOMAIN_LOG4J:
1546 case LTTNG_DOMAIN_PYTHON:
f28f9e44
JG
1547 if (!agent_tracing_is_enabled()) {
1548 DBG("Attempted to enable a channel in an agent domain but the agent thread is not running");
1549 ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
1550 goto error;
1551 }
6e21424e
JR
1552 break;
1553 default:
1554 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1555 goto error;
1556 }
1557
7972aab2 1558 switch (domain->type) {
2f77fc4b
DG
1559 case LTTNG_DOMAIN_KERNEL:
1560 {
1561 struct ltt_kernel_channel *kchan;
1562
2f77fc4b
DG
1563 kchan = trace_kernel_get_channel_by_name(attr->name,
1564 session->kernel_session);
1565 if (kchan == NULL) {
54213acc
JG
1566 if (session->snapshot.nb_output > 0 ||
1567 session->snapshot_mode) {
1568 /* Enforce mmap output for snapshot sessions. */
1569 attr->attr.output = LTTNG_EVENT_MMAP;
1570 }
2f77fc4b 1571 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
85076754
MD
1572 if (attr->name[0] != '\0') {
1573 session->kernel_session->has_non_default_channel = 1;
1574 }
2f77fc4b
DG
1575 } else {
1576 ret = channel_kernel_enable(session->kernel_session, kchan);
1577 }
1578
f73fabfd 1579 if (ret != LTTNG_OK) {
2f77fc4b
DG
1580 goto error;
1581 }
1582
7d268848 1583 kernel_wait_quiescent();
2f77fc4b
DG
1584 break;
1585 }
1586 case LTTNG_DOMAIN_UST:
9232818f
JG
1587 case LTTNG_DOMAIN_JUL:
1588 case LTTNG_DOMAIN_LOG4J:
1589 case LTTNG_DOMAIN_PYTHON:
2f77fc4b
DG
1590 {
1591 struct ltt_ust_channel *uchan;
1592
9232818f
JG
1593 /*
1594 * FIXME
1595 *
1596 * Current agent implementation limitations force us to allow
1597 * only one channel at once in "agent" subdomains. Each
1598 * subdomain has a default channel name which must be strictly
1599 * adhered to.
1600 */
1601 if (domain->type == LTTNG_DOMAIN_JUL) {
1602 if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME,
1603 LTTNG_SYMBOL_NAME_LEN)) {
1604 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1605 goto error;
1606 }
1607 } else if (domain->type == LTTNG_DOMAIN_LOG4J) {
1608 if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME,
1609 LTTNG_SYMBOL_NAME_LEN)) {
1610 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1611 goto error;
1612 }
1613 } else if (domain->type == LTTNG_DOMAIN_PYTHON) {
1614 if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME,
1615 LTTNG_SYMBOL_NAME_LEN)) {
1616 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1617 goto error;
1618 }
1619 }
1620
2f77fc4b
DG
1621 chan_ht = usess->domain_global.channels;
1622
1623 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1624 if (uchan == NULL) {
7972aab2 1625 ret = channel_ust_create(usess, attr, domain->buf_type);
85076754
MD
1626 if (attr->name[0] != '\0') {
1627 usess->has_non_default_channel = 1;
1628 }
2f77fc4b 1629 } else {
7972aab2 1630 ret = channel_ust_enable(usess, uchan);
2f77fc4b
DG
1631 }
1632 break;
1633 }
2f77fc4b 1634 default:
f73fabfd 1635 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1636 goto error;
1637 }
1638
54213acc
JG
1639 if (ret == LTTNG_OK && attr->attr.output != LTTNG_EVENT_MMAP) {
1640 session->has_non_mmap_channel = true;
1641 }
2f77fc4b 1642error:
2223c96f 1643 rcu_read_unlock();
1f345e94 1644end:
2f77fc4b
DG
1645 return ret;
1646}
1647
2f77fc4b
DG
1648/*
1649 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1650 */
56a37563
JG
1651int cmd_disable_event(struct ltt_session *session,
1652 enum lttng_domain_type domain, char *channel_name,
6e911cad 1653 struct lttng_event *event)
2f77fc4b
DG
1654{
1655 int ret;
6e911cad
MD
1656 char *event_name;
1657
18a720cd
MD
1658 DBG("Disable event command for event \'%s\'", event->name);
1659
6e911cad
MD
1660 event_name = event->name;
1661
9b7431cf
JG
1662 /* Error out on unhandled search criteria */
1663 if (event->loglevel_type || event->loglevel != -1 || event->enabled
6e911cad 1664 || event->pid || event->filter || event->exclusion) {
7076b56e
JG
1665 ret = LTTNG_ERR_UNK;
1666 goto error;
6e911cad 1667 }
2f77fc4b 1668
2223c96f
DG
1669 rcu_read_lock();
1670
2f77fc4b
DG
1671 switch (domain) {
1672 case LTTNG_DOMAIN_KERNEL:
1673 {
1674 struct ltt_kernel_channel *kchan;
1675 struct ltt_kernel_session *ksess;
1676
1677 ksess = session->kernel_session;
1678
85076754
MD
1679 /*
1680 * If a non-default channel has been created in the
1681 * session, explicitely require that -c chan_name needs
1682 * to be provided.
1683 */
1684 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1685 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1686 goto error_unlock;
85076754
MD
1687 }
1688
2f77fc4b
DG
1689 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1690 if (kchan == NULL) {
f73fabfd 1691 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
7076b56e 1692 goto error_unlock;
2f77fc4b
DG
1693 }
1694
6e911cad
MD
1695 switch (event->type) {
1696 case LTTNG_EVENT_ALL:
9550ee81 1697 case LTTNG_EVENT_TRACEPOINT:
d0ae4ea8 1698 case LTTNG_EVENT_SYSCALL:
9550ee81
JR
1699 case LTTNG_EVENT_PROBE:
1700 case LTTNG_EVENT_FUNCTION:
1701 case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */
1702 if (event_name[0] == '\0') {
1703 ret = event_kernel_disable_event(kchan,
1704 NULL, event->type);
29c62722 1705 } else {
d0ae4ea8 1706 ret = event_kernel_disable_event(kchan,
9550ee81 1707 event_name, event->type);
29c62722 1708 }
6e911cad 1709 if (ret != LTTNG_OK) {
7076b56e 1710 goto error_unlock;
6e911cad
MD
1711 }
1712 break;
6e911cad
MD
1713 default:
1714 ret = LTTNG_ERR_UNK;
7076b56e 1715 goto error_unlock;
2f77fc4b
DG
1716 }
1717
7d268848 1718 kernel_wait_quiescent();
2f77fc4b
DG
1719 break;
1720 }
1721 case LTTNG_DOMAIN_UST:
1722 {
1723 struct ltt_ust_channel *uchan;
1724 struct ltt_ust_session *usess;
1725
1726 usess = session->ust_session;
1727
7076b56e
JG
1728 if (validate_ust_event_name(event_name)) {
1729 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1730 goto error_unlock;
1731 }
1732
85076754
MD
1733 /*
1734 * If a non-default channel has been created in the
9550ee81 1735 * session, explicitly require that -c chan_name needs
85076754
MD
1736 * to be provided.
1737 */
1738 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1739 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1740 goto error_unlock;
85076754
MD
1741 }
1742
2f77fc4b
DG
1743 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1744 channel_name);
1745 if (uchan == NULL) {
f73fabfd 1746 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
7076b56e 1747 goto error_unlock;
2f77fc4b
DG
1748 }
1749
6e911cad
MD
1750 switch (event->type) {
1751 case LTTNG_EVENT_ALL:
b3639870
JR
1752 /*
1753 * An empty event name means that everything
1754 * should be disabled.
1755 */
1756 if (event->name[0] == '\0') {
1757 ret = event_ust_disable_all_tracepoints(usess, uchan);
77d536b2
JR
1758 } else {
1759 ret = event_ust_disable_tracepoint(usess, uchan,
1760 event_name);
1761 }
6e911cad 1762 if (ret != LTTNG_OK) {
7076b56e 1763 goto error_unlock;
6e911cad
MD
1764 }
1765 break;
1766 default:
1767 ret = LTTNG_ERR_UNK;
7076b56e 1768 goto error_unlock;
2f77fc4b
DG
1769 }
1770
1771 DBG3("Disable UST event %s in channel %s completed", event_name,
1772 channel_name);
1773 break;
1774 }
5cdb6027 1775 case LTTNG_DOMAIN_LOG4J:
f20baf8e 1776 case LTTNG_DOMAIN_JUL:
0e115563 1777 case LTTNG_DOMAIN_PYTHON:
f20baf8e 1778 {
fefd409b 1779 struct agent *agt;
f20baf8e
DG
1780 struct ltt_ust_session *usess = session->ust_session;
1781
1782 assert(usess);
1783
6e911cad
MD
1784 switch (event->type) {
1785 case LTTNG_EVENT_ALL:
1786 break;
1787 default:
1788 ret = LTTNG_ERR_UNK;
7076b56e 1789 goto error_unlock;
6e911cad
MD
1790 }
1791
5cdb6027 1792 agt = trace_ust_find_agent(usess, domain);
fefd409b
DG
1793 if (!agt) {
1794 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
7076b56e 1795 goto error_unlock;
fefd409b 1796 }
b3639870
JR
1797 /*
1798 * An empty event name means that everything
1799 * should be disabled.
1800 */
1801 if (event->name[0] == '\0') {
18a720cd
MD
1802 ret = event_agent_disable_all(usess, agt);
1803 } else {
1804 ret = event_agent_disable(usess, agt, event_name);
1805 }
f20baf8e 1806 if (ret != LTTNG_OK) {
7076b56e 1807 goto error_unlock;
f20baf8e
DG
1808 }
1809
1810 break;
1811 }
2f77fc4b 1812 default:
f73fabfd 1813 ret = LTTNG_ERR_UND;
7076b56e 1814 goto error_unlock;
2f77fc4b
DG
1815 }
1816
f73fabfd 1817 ret = LTTNG_OK;
2f77fc4b 1818
7076b56e 1819error_unlock:
2223c96f 1820 rcu_read_unlock();
7076b56e 1821error:
2f77fc4b
DG
1822 return ret;
1823}
1824
2f77fc4b
DG
1825/*
1826 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1827 */
56a37563 1828int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain,
601d5acf 1829 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
2f77fc4b 1830{
d5979e4a 1831 int ret, chan_kern_created = 0, chan_ust_created = 0;
bdf64013
JG
1832 char *app_ctx_provider_name = NULL, *app_ctx_name = NULL;
1833
9a699f7b
JR
1834 /*
1835 * Don't try to add a context if the session has been started at
1836 * some point in time before. The tracer does not allow it and would
1837 * result in a corrupted trace.
1838 */
1839 if (session->has_been_started) {
1840 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1841 goto end;
1842 }
1843
bdf64013
JG
1844 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
1845 app_ctx_provider_name = ctx->u.app_ctx.provider_name;
1846 app_ctx_name = ctx->u.app_ctx.ctx_name;
1847 }
2f77fc4b
DG
1848
1849 switch (domain) {
1850 case LTTNG_DOMAIN_KERNEL:
979e618e
DG
1851 assert(session->kernel_session);
1852
1853 if (session->kernel_session->channel_count == 0) {
1854 /* Create default channel */
1855 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1856 if (ret != LTTNG_OK) {
1857 goto error;
1858 }
d5979e4a 1859 chan_kern_created = 1;
979e618e 1860 }
2f77fc4b 1861 /* Add kernel context to kernel tracer */
601d5acf 1862 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
f73fabfd 1863 if (ret != LTTNG_OK) {
2f77fc4b
DG
1864 goto error;
1865 }
1866 break;
bdf64013
JG
1867 case LTTNG_DOMAIN_JUL:
1868 case LTTNG_DOMAIN_LOG4J:
1869 {
1870 /*
1871 * Validate channel name.
1872 * If no channel name is given and the domain is JUL or LOG4J,
1873 * set it to the appropriate domain-specific channel name. If
1874 * a name is provided but does not match the expexted channel
1875 * name, return an error.
1876 */
1877 if (domain == LTTNG_DOMAIN_JUL && *channel_name &&
1878 strcmp(channel_name,
1879 DEFAULT_JUL_CHANNEL_NAME)) {
1880 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1881 goto error;
1882 } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name &&
1883 strcmp(channel_name,
1884 DEFAULT_LOG4J_CHANNEL_NAME)) {
1885 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1886 goto error;
1887 }
a93b3916 1888 /* break is _not_ missing here. */
bdf64013 1889 }
2f77fc4b
DG
1890 case LTTNG_DOMAIN_UST:
1891 {
1892 struct ltt_ust_session *usess = session->ust_session;
85076754
MD
1893 unsigned int chan_count;
1894
2f77fc4b
DG
1895 assert(usess);
1896
85076754 1897 chan_count = lttng_ht_get_count(usess->domain_global.channels);
979e618e
DG
1898 if (chan_count == 0) {
1899 struct lttng_channel *attr;
1900 /* Create default channel */
0a9c6494 1901 attr = channel_new_default_attr(domain, usess->buffer_type);
979e618e
DG
1902 if (attr == NULL) {
1903 ret = LTTNG_ERR_FATAL;
1904 goto error;
1905 }
1906
7972aab2 1907 ret = channel_ust_create(usess, attr, usess->buffer_type);
979e618e
DG
1908 if (ret != LTTNG_OK) {
1909 free(attr);
1910 goto error;
1911 }
cf0bcb51 1912 channel_attr_destroy(attr);
d5979e4a 1913 chan_ust_created = 1;
979e618e
DG
1914 }
1915
601d5acf 1916 ret = context_ust_add(usess, domain, ctx, channel_name);
bdf64013
JG
1917 free(app_ctx_provider_name);
1918 free(app_ctx_name);
1919 app_ctx_name = NULL;
1920 app_ctx_provider_name = NULL;
f73fabfd 1921 if (ret != LTTNG_OK) {
2f77fc4b
DG
1922 goto error;
1923 }
1924 break;
1925 }
2f77fc4b 1926 default:
f73fabfd 1927 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1928 goto error;
1929 }
1930
bdf64013
JG
1931 ret = LTTNG_OK;
1932 goto end;
2f77fc4b
DG
1933
1934error:
d5979e4a
DG
1935 if (chan_kern_created) {
1936 struct ltt_kernel_channel *kchan =
1937 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1938 session->kernel_session);
1939 /* Created previously, this should NOT fail. */
1940 assert(kchan);
1941 kernel_destroy_channel(kchan);
1942 }
1943
1944 if (chan_ust_created) {
1945 struct ltt_ust_channel *uchan =
1946 trace_ust_find_channel_by_name(
1947 session->ust_session->domain_global.channels,
1948 DEFAULT_CHANNEL_NAME);
1949 /* Created previously, this should NOT fail. */
1950 assert(uchan);
1951 /* Remove from the channel list of the session. */
1952 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1953 uchan);
1954 trace_ust_destroy_channel(uchan);
1955 }
bdf64013
JG
1956end:
1957 free(app_ctx_provider_name);
1958 free(app_ctx_name);
2f77fc4b
DG
1959 return ret;
1960}
1961
dac8e046
JG
1962static inline bool name_starts_with(const char *name, const char *prefix)
1963{
1964 const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
1965
1966 return !strncmp(name, prefix, max_cmp_len);
1967}
1968
1969/* Perform userspace-specific event name validation */
1970static int validate_ust_event_name(const char *name)
1971{
1972 int ret = 0;
1973
1974 if (!name) {
1975 ret = -1;
1976 goto end;
1977 }
1978
1979 /*
1980 * Check name against all internal UST event component namespaces used
1981 * by the agents.
1982 */
1983 if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) ||
1984 name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) ||
1985 name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) {
1986 ret = -1;
1987 }
1988
1989end:
1990 return ret;
1991}
88f06f15 1992
2f77fc4b 1993/*
88f06f15
JG
1994 * Internal version of cmd_enable_event() with a supplemental
1995 * "internal_event" flag which is used to enable internal events which should
1996 * be hidden from clients. Such events are used in the agent implementation to
1997 * enable the events through which all "agent" events are funeled.
2f77fc4b 1998 */
88f06f15
JG
1999static int _cmd_enable_event(struct ltt_session *session,
2000 struct lttng_domain *domain,
025faf73 2001 char *channel_name, struct lttng_event *event,
6b453b5e 2002 char *filter_expression,
db8f1377
JI
2003 struct lttng_filter_bytecode *filter,
2004 struct lttng_event_exclusion *exclusion,
88f06f15 2005 int wpipe, bool internal_event)
2f77fc4b 2006{
9f449915 2007 int ret = 0, channel_created = 0;
cfedea03 2008 struct lttng_channel *attr = NULL;
2f77fc4b
DG
2009
2010 assert(session);
2011 assert(event);
2012 assert(channel_name);
2013
2a385866
JG
2014 /* If we have a filter, we must have its filter expression */
2015 assert(!(!!filter_expression ^ !!filter));
2016
9f449915
PP
2017 /* Normalize event name as a globbing pattern */
2018 strutils_normalize_star_glob_pattern(event->name);
18a720cd 2019
9f449915
PP
2020 /* Normalize exclusion names as globbing patterns */
2021 if (exclusion) {
2022 size_t i;
f5ac4bd7 2023
9f449915
PP
2024 for (i = 0; i < exclusion->count; i++) {
2025 char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i);
2026
2027 strutils_normalize_star_glob_pattern(name);
2028 }
930a2e99
JG
2029 }
2030
9f449915
PP
2031 DBG("Enable event command for event \'%s\'", event->name);
2032
2033 rcu_read_lock();
2034
7972aab2 2035 switch (domain->type) {
2f77fc4b
DG
2036 case LTTNG_DOMAIN_KERNEL:
2037 {
2038 struct ltt_kernel_channel *kchan;
2039
85076754
MD
2040 /*
2041 * If a non-default channel has been created in the
2042 * session, explicitely require that -c chan_name needs
2043 * to be provided.
2044 */
2045 if (session->kernel_session->has_non_default_channel
2046 && channel_name[0] == '\0') {
2047 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
2048 goto error;
2049 }
2050
2f77fc4b
DG
2051 kchan = trace_kernel_get_channel_by_name(channel_name,
2052 session->kernel_session);
2053 if (kchan == NULL) {
0a9c6494
DG
2054 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
2055 LTTNG_BUFFER_GLOBAL);
2f77fc4b 2056 if (attr == NULL) {
f73fabfd 2057 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2058 goto error;
2059 }
04c17253
MD
2060 if (lttng_strncpy(attr->name, channel_name,
2061 sizeof(attr->name))) {
2062 ret = LTTNG_ERR_INVALID;
04c17253
MD
2063 goto error;
2064 }
2f77fc4b
DG
2065
2066 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 2067 if (ret != LTTNG_OK) {
2f77fc4b
DG
2068 goto error;
2069 }
e5f5db7f 2070 channel_created = 1;
2f77fc4b
DG
2071 }
2072
2073 /* Get the newly created kernel channel pointer */
2074 kchan = trace_kernel_get_channel_by_name(channel_name,
2075 session->kernel_session);
2076 if (kchan == NULL) {
2077 /* This sould not happen... */
f73fabfd 2078 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2079 goto error;
2080 }
2081
6e911cad
MD
2082 switch (event->type) {
2083 case LTTNG_EVENT_ALL:
29c62722 2084 {
00a62084
MD
2085 char *filter_expression_a = NULL;
2086 struct lttng_filter_bytecode *filter_a = NULL;
2087
2088 /*
2089 * We need to duplicate filter_expression and filter,
2090 * because ownership is passed to first enable
2091 * event.
2092 */
2093 if (filter_expression) {
2094 filter_expression_a = strdup(filter_expression);
2095 if (!filter_expression_a) {
2096 ret = LTTNG_ERR_FATAL;
2097 goto error;
2098 }
2099 }
2100 if (filter) {
2101 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
2102 if (!filter_a) {
2103 free(filter_expression_a);
2104 ret = LTTNG_ERR_FATAL;
2105 goto error;
2106 }
2107 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
2108 }
29c62722 2109 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
00a62084
MD
2110 ret = event_kernel_enable_event(kchan, event,
2111 filter_expression, filter);
a969e101
MD
2112 /* We have passed ownership */
2113 filter_expression = NULL;
2114 filter = NULL;
29c62722
MD
2115 if (ret != LTTNG_OK) {
2116 if (channel_created) {
2117 /* Let's not leak a useless channel. */
2118 kernel_destroy_channel(kchan);
2119 }
00a62084
MD
2120 free(filter_expression_a);
2121 free(filter_a);
29c62722
MD
2122 goto error;
2123 }
2124 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
00a62084
MD
2125 ret = event_kernel_enable_event(kchan, event,
2126 filter_expression_a, filter_a);
60d21fa2
AB
2127 /* We have passed ownership */
2128 filter_expression_a = NULL;
2129 filter_a = NULL;
29c62722
MD
2130 if (ret != LTTNG_OK) {
2131 goto error;
2132 }
2133 break;
2134 }
6e6ef3d7 2135 case LTTNG_EVENT_PROBE:
dcabc190 2136 case LTTNG_EVENT_USERSPACE_PROBE:
6e6ef3d7
DG
2137 case LTTNG_EVENT_FUNCTION:
2138 case LTTNG_EVENT_FUNCTION_ENTRY:
6e911cad 2139 case LTTNG_EVENT_TRACEPOINT:
00a62084
MD
2140 ret = event_kernel_enable_event(kchan, event,
2141 filter_expression, filter);
a969e101
MD
2142 /* We have passed ownership */
2143 filter_expression = NULL;
2144 filter = NULL;
6e911cad
MD
2145 if (ret != LTTNG_OK) {
2146 if (channel_created) {
2147 /* Let's not leak a useless channel. */
2148 kernel_destroy_channel(kchan);
2149 }
2150 goto error;
e5f5db7f 2151 }
6e911cad
MD
2152 break;
2153 case LTTNG_EVENT_SYSCALL:
00a62084
MD
2154 ret = event_kernel_enable_event(kchan, event,
2155 filter_expression, filter);
a969e101
MD
2156 /* We have passed ownership */
2157 filter_expression = NULL;
2158 filter = NULL;
e2b957af
MD
2159 if (ret != LTTNG_OK) {
2160 goto error;
2161 }
6e911cad
MD
2162 break;
2163 default:
2164 ret = LTTNG_ERR_UNK;
2f77fc4b
DG
2165 goto error;
2166 }
2167
7d268848 2168 kernel_wait_quiescent();
2f77fc4b
DG
2169 break;
2170 }
2171 case LTTNG_DOMAIN_UST:
2172 {
2173 struct ltt_ust_channel *uchan;
2174 struct ltt_ust_session *usess = session->ust_session;
2175
2176 assert(usess);
2177
85076754
MD
2178 /*
2179 * If a non-default channel has been created in the
2180 * session, explicitely require that -c chan_name needs
2181 * to be provided.
2182 */
2183 if (usess->has_non_default_channel && channel_name[0] == '\0') {
2184 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
2185 goto error;
2186 }
2187
2f77fc4b
DG
2188 /* Get channel from global UST domain */
2189 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2190 channel_name);
2191 if (uchan == NULL) {
2192 /* Create default channel */
0a9c6494
DG
2193 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
2194 usess->buffer_type);
2f77fc4b 2195 if (attr == NULL) {
f73fabfd 2196 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2197 goto error;
2198 }
04c17253
MD
2199 if (lttng_strncpy(attr->name, channel_name,
2200 sizeof(attr->name))) {
2201 ret = LTTNG_ERR_INVALID;
04c17253
MD
2202 goto error;
2203 }
2f77fc4b
DG
2204
2205 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 2206 if (ret != LTTNG_OK) {
2f77fc4b
DG
2207 goto error;
2208 }
2f77fc4b
DG
2209
2210 /* Get the newly created channel reference back */
2211 uchan = trace_ust_find_channel_by_name(
2212 usess->domain_global.channels, channel_name);
2213 assert(uchan);
2214 }
2215
141feb8c
JG
2216 if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) {
2217 /*
2218 * Don't allow users to add UST events to channels which
2219 * are assigned to a userspace subdomain (JUL, Log4J,
2220 * Python, etc.).
2221 */
2222 ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN;
2223 goto error;
2224 }
2225
dac8e046
JG
2226 if (!internal_event) {
2227 /*
2228 * Ensure the event name is not reserved for internal
2229 * use.
2230 */
2231 ret = validate_ust_event_name(event->name);
2232 if (ret) {
2233 WARN("Userspace event name %s failed validation.",
bbcab087 2234 event->name);
dac8e046
JG
2235 ret = LTTNG_ERR_INVALID_EVENT_NAME;
2236 goto error;
2237 }
2238 }
2239
2f77fc4b 2240 /* At this point, the session and channel exist on the tracer */
6b453b5e 2241 ret = event_ust_enable_tracepoint(usess, uchan, event,
88f06f15
JG
2242 filter_expression, filter, exclusion,
2243 internal_event);
49d21f93
MD
2244 /* We have passed ownership */
2245 filter_expression = NULL;
2246 filter = NULL;
2247 exclusion = NULL;
94382e15
JG
2248 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2249 goto already_enabled;
2250 } else if (ret != LTTNG_OK) {
2f77fc4b
DG
2251 goto error;
2252 }
2253 break;
2254 }
5cdb6027 2255 case LTTNG_DOMAIN_LOG4J:
f20baf8e 2256 case LTTNG_DOMAIN_JUL:
0e115563 2257 case LTTNG_DOMAIN_PYTHON:
f20baf8e 2258 {
da6c3a50 2259 const char *default_event_name, *default_chan_name;
fefd409b 2260 struct agent *agt;
f20baf8e
DG
2261 struct lttng_event uevent;
2262 struct lttng_domain tmp_dom;
2263 struct ltt_ust_session *usess = session->ust_session;
2264
2265 assert(usess);
2266
f28f9e44
JG
2267 if (!agent_tracing_is_enabled()) {
2268 DBG("Attempted to enable an event in an agent domain but the agent thread is not running");
2269 ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
2270 goto error;
2271 }
2272
5cdb6027 2273 agt = trace_ust_find_agent(usess, domain->type);
fefd409b 2274 if (!agt) {
5cdb6027 2275 agt = agent_create(domain->type);
fefd409b 2276 if (!agt) {
e5b3c48c 2277 ret = LTTNG_ERR_NOMEM;
fefd409b
DG
2278 goto error;
2279 }
2280 agent_add(agt, usess->agents);
2281 }
2282
022d91ba 2283 /* Create the default tracepoint. */
996de3c7 2284 memset(&uevent, 0, sizeof(uevent));
f20baf8e
DG
2285 uevent.type = LTTNG_EVENT_TRACEPOINT;
2286 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
51755dc8
JG
2287 default_event_name = event_get_default_agent_ust_name(
2288 domain->type);
da6c3a50 2289 if (!default_event_name) {
e5b3c48c 2290 ret = LTTNG_ERR_FATAL;
da6c3a50 2291 goto error;
f43f95a9 2292 }
da6c3a50 2293 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
f20baf8e
DG
2294 uevent.name[sizeof(uevent.name) - 1] = '\0';
2295
2296 /*
2297 * The domain type is changed because we are about to enable the
2298 * default channel and event for the JUL domain that are hardcoded.
2299 * This happens in the UST domain.
2300 */
2301 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
2302 tmp_dom.type = LTTNG_DOMAIN_UST;
2303
0e115563
DG
2304 switch (domain->type) {
2305 case LTTNG_DOMAIN_LOG4J:
da6c3a50 2306 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
0e115563
DG
2307 break;
2308 case LTTNG_DOMAIN_JUL:
da6c3a50 2309 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
0e115563
DG
2310 break;
2311 case LTTNG_DOMAIN_PYTHON:
2312 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
2313 break;
2314 default:
e98a44b0 2315 /* The switch/case we are in makes this impossible */
0e115563 2316 assert(0);
da6c3a50
DG
2317 }
2318
971da06a 2319 {
8404118c 2320 char *filter_expression_copy = NULL;
51755dc8 2321 struct lttng_filter_bytecode *filter_copy = NULL;
971da06a
JG
2322
2323 if (filter) {
51755dc8
JG
2324 const size_t filter_size = sizeof(
2325 struct lttng_filter_bytecode)
2326 + filter->len;
2327
2328 filter_copy = zmalloc(filter_size);
971da06a 2329 if (!filter_copy) {
018096a4 2330 ret = LTTNG_ERR_NOMEM;
b742e3e2 2331 goto error;
971da06a 2332 }
51755dc8 2333 memcpy(filter_copy, filter, filter_size);
971da06a 2334
8404118c
JG
2335 filter_expression_copy =
2336 strdup(filter_expression);
2337 if (!filter_expression) {
2338 ret = LTTNG_ERR_NOMEM;
51755dc8
JG
2339 }
2340
2341 if (!filter_expression_copy || !filter_copy) {
2342 free(filter_expression_copy);
2343 free(filter_copy);
2344 goto error;
8404118c 2345 }
971da06a
JG
2346 }
2347
88f06f15 2348 ret = cmd_enable_event_internal(session, &tmp_dom,
971da06a 2349 (char *) default_chan_name,
8404118c
JG
2350 &uevent, filter_expression_copy,
2351 filter_copy, NULL, wpipe);
971da06a
JG
2352 }
2353
94382e15
JG
2354 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2355 goto already_enabled;
2356 } else if (ret != LTTNG_OK) {
f20baf8e
DG
2357 goto error;
2358 }
2359
2360 /* The wild card * means that everything should be enabled. */
2361 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
8404118c
JG
2362 ret = event_agent_enable_all(usess, agt, event, filter,
2363 filter_expression);
f20baf8e 2364 } else {
8404118c
JG
2365 ret = event_agent_enable(usess, agt, event, filter,
2366 filter_expression);
f20baf8e 2367 }
51755dc8
JG
2368 filter = NULL;
2369 filter_expression = NULL;
f20baf8e
DG
2370 if (ret != LTTNG_OK) {
2371 goto error;
2372 }
2373
2374 break;
2375 }
2f77fc4b 2376 default:
f73fabfd 2377 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2378 goto error;
2379 }
2380
f73fabfd 2381 ret = LTTNG_OK;
2f77fc4b 2382
94382e15 2383already_enabled:
2f77fc4b 2384error:
49d21f93
MD
2385 free(filter_expression);
2386 free(filter);
2387 free(exclusion);
cf0bcb51 2388 channel_attr_destroy(attr);
2223c96f 2389 rcu_read_unlock();
2f77fc4b
DG
2390 return ret;
2391}
2392
88f06f15
JG
2393/*
2394 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2395 * We own filter, exclusion, and filter_expression.
2396 */
2397int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
2398 char *channel_name, struct lttng_event *event,
2399 char *filter_expression,
2400 struct lttng_filter_bytecode *filter,
2401 struct lttng_event_exclusion *exclusion,
2402 int wpipe)
2403{
2404 return _cmd_enable_event(session, domain, channel_name, event,
2405 filter_expression, filter, exclusion, wpipe, false);
2406}
2407
2408/*
2409 * Enable an event which is internal to LTTng. An internal should
2410 * never be made visible to clients and are immune to checks such as
2411 * reserved names.
2412 */
2413static int cmd_enable_event_internal(struct ltt_session *session,
2414 struct lttng_domain *domain,
2415 char *channel_name, struct lttng_event *event,
2416 char *filter_expression,
2417 struct lttng_filter_bytecode *filter,
2418 struct lttng_event_exclusion *exclusion,
2419 int wpipe)
2420{
2421 return _cmd_enable_event(session, domain, channel_name, event,
2422 filter_expression, filter, exclusion, wpipe, true);
2423}
2424
2f77fc4b
DG
2425/*
2426 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2427 */
56a37563
JG
2428ssize_t cmd_list_tracepoints(enum lttng_domain_type domain,
2429 struct lttng_event **events)
2f77fc4b
DG
2430{
2431 int ret;
2432 ssize_t nb_events = 0;
2433
2434 switch (domain) {
2435 case LTTNG_DOMAIN_KERNEL:
7d268848 2436 nb_events = kernel_list_events(events);
2f77fc4b 2437 if (nb_events < 0) {
f73fabfd 2438 ret = LTTNG_ERR_KERN_LIST_FAIL;
2f77fc4b
DG
2439 goto error;
2440 }
2441 break;
2442 case LTTNG_DOMAIN_UST:
2443 nb_events = ust_app_list_events(events);
2444 if (nb_events < 0) {
f73fabfd 2445 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
2446 goto error;
2447 }
2448 break;
5cdb6027 2449 case LTTNG_DOMAIN_LOG4J:
3c6a091f 2450 case LTTNG_DOMAIN_JUL:
0e115563 2451 case LTTNG_DOMAIN_PYTHON:
f60140a1 2452 nb_events = agent_list_events(events, domain);
3c6a091f
DG
2453 if (nb_events < 0) {
2454 ret = LTTNG_ERR_UST_LIST_FAIL;
2455 goto error;
2456 }
2457 break;
2f77fc4b 2458 default:
f73fabfd 2459 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2460 goto error;
2461 }
2462
2463 return nb_events;
2464
2465error:
2466 /* Return negative value to differentiate return code */
2467 return -ret;
2468}
2469
2470/*
2471 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2472 */
56a37563 2473ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain,
2f77fc4b
DG
2474 struct lttng_event_field **fields)
2475{
2476 int ret;
2477 ssize_t nb_fields = 0;
2478
2479 switch (domain) {
2480 case LTTNG_DOMAIN_UST:
2481 nb_fields = ust_app_list_event_fields(fields);
2482 if (nb_fields < 0) {
f73fabfd 2483 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
2484 goto error;
2485 }
2486 break;
2487 case LTTNG_DOMAIN_KERNEL:
2488 default: /* fall-through */
f73fabfd 2489 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2490 goto error;
2491 }
2492
2493 return nb_fields;
2494
2495error:
2496 /* Return negative value to differentiate return code */
2497 return -ret;
2498}
2499
834978fd
DG
2500ssize_t cmd_list_syscalls(struct lttng_event **events)
2501{
2502 return syscall_table_list(events);
2503}
2504
a5dfbb9d
MD
2505/*
2506 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2507 *
2508 * Called with session lock held.
2509 */
2510ssize_t cmd_list_tracker_pids(struct ltt_session *session,
56a37563 2511 enum lttng_domain_type domain, int32_t **pids)
a5dfbb9d
MD
2512{
2513 int ret;
2514 ssize_t nr_pids = 0;
2515
2516 switch (domain) {
2517 case LTTNG_DOMAIN_KERNEL:
2518 {
2519 struct ltt_kernel_session *ksess;
2520
2521 ksess = session->kernel_session;
2522 nr_pids = kernel_list_tracker_pids(ksess, pids);
2523 if (nr_pids < 0) {
2524 ret = LTTNG_ERR_KERN_LIST_FAIL;
2525 goto error;
2526 }
2527 break;
2528 }
2529 case LTTNG_DOMAIN_UST:
2530 {
2531 struct ltt_ust_session *usess;
2532
2533 usess = session->ust_session;
2534 nr_pids = trace_ust_list_tracker_pids(usess, pids);
2535 if (nr_pids < 0) {
2536 ret = LTTNG_ERR_UST_LIST_FAIL;
2537 goto error;
2538 }
2539 break;
2540 }
2541 case LTTNG_DOMAIN_LOG4J:
2542 case LTTNG_DOMAIN_JUL:
2543 case LTTNG_DOMAIN_PYTHON:
2544 default:
2545 ret = LTTNG_ERR_UND;
2546 goto error;
2547 }
2548
2549 return nr_pids;
2550
2551error:
2552 /* Return negative value to differentiate return code */
2553 return -ret;
2554}
2555
2f77fc4b
DG
2556/*
2557 * Command LTTNG_START_TRACE processed by the client thread.
a9ad0c8f
MD
2558 *
2559 * Called with session mutex held.
2f77fc4b
DG
2560 */
2561int cmd_start_trace(struct ltt_session *session)
2562{
82b69413 2563 enum lttng_error_code ret;
cde3e505 2564 unsigned long nb_chan = 0;
2f77fc4b
DG
2565 struct ltt_kernel_session *ksession;
2566 struct ltt_ust_session *usess;
2f77fc4b
DG
2567
2568 assert(session);
2569
2570 /* Ease our life a bit ;) */
2571 ksession = session->kernel_session;
2572 usess = session->ust_session;
2573
8382cf6f
DG
2574 /* Is the session already started? */
2575 if (session->active) {
f73fabfd 2576 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2577 goto error;
2578 }
2579
cde3e505
DG
2580 /*
2581 * Starting a session without channel is useless since after that it's not
2582 * possible to enable channel thus inform the client.
2583 */
2584 if (usess && usess->domain_global.channels) {
2585 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
2586 }
2587 if (ksession) {
2588 nb_chan += ksession->channel_count;
2589 }
2590 if (!nb_chan) {
2591 ret = LTTNG_ERR_NO_CHANNEL;
2592 goto error;
2593 }
2594
070b6a86 2595 if (session->output_traces && !session->current_trace_chunk) {
d2956687
JG
2596 struct lttng_trace_chunk *trace_chunk;
2597
2598 trace_chunk = session_create_new_trace_chunk(
348a81dc 2599 session, NULL, NULL, NULL);
d2956687
JG
2600 if (!trace_chunk) {
2601 ret = LTTNG_ERR_CREATE_DIR_FAIL;
2602 goto error;
2603 }
2604 assert(!session->current_trace_chunk);
2605 ret = session_set_trace_chunk(session, trace_chunk, NULL);
2606 lttng_trace_chunk_put(trace_chunk);
2607 if (ret) {
2608 ret = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER;
5c408ad8
JD
2609 goto error;
2610 }
c996624c
JD
2611 }
2612
2f77fc4b
DG
2613 /* Kernel tracing */
2614 if (ksession != NULL) {
c996624c 2615 DBG("Start kernel tracing session %s", session->name);
7d268848 2616 ret = start_kernel_session(ksession);
9b6c7ec5 2617 if (ret != LTTNG_OK) {
2f77fc4b
DG
2618 goto error;
2619 }
2f77fc4b
DG
2620 }
2621
2622 /* Flag session that trace should start automatically */
2623 if (usess) {
82b69413
JG
2624 int int_ret = ust_app_start_trace_all(usess);
2625
2626 if (int_ret < 0) {
f73fabfd 2627 ret = LTTNG_ERR_UST_START_FAIL;
2f77fc4b
DG
2628 goto error;
2629 }
2630 }
2631
8382cf6f
DG
2632 /* Flag this after a successful start. */
2633 session->has_been_started = 1;
2634 session->active = 1;
9b6c7ec5 2635
5c408ad8
JD
2636 /*
2637 * Clear the flag that indicates that a rotation was done while the
2638 * session was stopped.
2639 */
2640 session->rotated_after_last_stop = false;
2641
259c2674 2642 if (session->rotate_timer_period) {
82b69413
JG
2643 int int_ret = timer_session_rotation_schedule_timer_start(
2644 session, session->rotate_timer_period);
2645
2646 if (int_ret < 0) {
259c2674
JD
2647 ERR("Failed to enable rotate timer");
2648 ret = LTTNG_ERR_UNK;
2649 goto error;
2650 }
2651 }
2652
f73fabfd 2653 ret = LTTNG_OK;
2f77fc4b
DG
2654
2655error:
2656 return ret;
2657}
2658
2659/*
2660 * Command LTTNG_STOP_TRACE processed by the client thread.
2661 */
2662int cmd_stop_trace(struct ltt_session *session)
2663{
2664 int ret;
2665 struct ltt_kernel_channel *kchan;
2666 struct ltt_kernel_session *ksession;
2667 struct ltt_ust_session *usess;
a9577b76 2668 bool error_occurred = false;
2f77fc4b
DG
2669
2670 assert(session);
2671
5c408ad8 2672 DBG("Begin stop session %s (id %" PRIu64 ")", session->name, session->id);
2f77fc4b
DG
2673 /* Short cut */
2674 ksession = session->kernel_session;
2675 usess = session->ust_session;
2676
8382cf6f
DG
2677 /* Session is not active. Skip everythong and inform the client. */
2678 if (!session->active) {
f73fabfd 2679 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2f77fc4b
DG
2680 goto error;
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
7d268848 2693 kernel_wait_quiescent();
566d8970
MD
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");
a46a2b76 2700 error_occurred = true;
2f77fc4b
DG
2701 }
2702 }
2703
566d8970 2704 /* Flush all buffers after stopping */
2f77fc4b
DG
2705 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2706 ret = kernel_flush_buffer(kchan);
2707 if (ret < 0) {
2708 ERR("Kernel flush buffer error");
a46a2b76 2709 error_occurred = true;
2f77fc4b
DG
2710 }
2711 }
2712
14fb1ebe 2713 ksession->active = 0;
5c408ad8
JD
2714 DBG("Kernel session stopped %s (id %" PRIu64 ")", session->name,
2715 session->id);
2f77fc4b
DG
2716 }
2717
14fb1ebe 2718 if (usess && usess->active) {
2f77fc4b
DG
2719 ret = ust_app_stop_trace_all(usess);
2720 if (ret < 0) {
f73fabfd 2721 ret = LTTNG_ERR_UST_STOP_FAIL;
2f77fc4b
DG
2722 goto error;
2723 }
2724 }
2725
8382cf6f
DG
2726 /* Flag inactive after a successful stop. */
2727 session->active = 0;
a9577b76 2728 ret = !error_occurred ? LTTNG_OK : LTTNG_ERR_UNK;
2f77fc4b
DG
2729
2730error:
2731 return ret;
2732}
2733
2734/*
2735 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2736 */
bda32d56
JG
2737int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2738 struct lttng_uri *uris)
2f77fc4b
DG
2739{
2740 int ret, i;
2741 struct ltt_kernel_session *ksess = session->kernel_session;
2742 struct ltt_ust_session *usess = session->ust_session;
2f77fc4b
DG
2743
2744 assert(session);
2745 assert(uris);
2746 assert(nb_uri > 0);
2747
8382cf6f
DG
2748 /* Can't set consumer URI if the session is active. */
2749 if (session->active) {
f73fabfd 2750 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2751 goto error;
2752 }
2753
bda32d56 2754 /* Set the "global" consumer URIs */
2f77fc4b 2755 for (i = 0; i < nb_uri; i++) {
b178f53e
JG
2756 ret = add_uri_to_consumer(session,
2757 session->consumer,
2758 &uris[i], LTTNG_DOMAIN_NONE);
a74934ba 2759 if (ret != LTTNG_OK) {
2f77fc4b
DG
2760 goto error;
2761 }
2f77fc4b
DG
2762 }
2763
bda32d56
JG
2764 /* Set UST session URIs */
2765 if (session->ust_session) {
2766 for (i = 0; i < nb_uri; i++) {
b178f53e 2767 ret = add_uri_to_consumer(session,
bda32d56 2768 session->ust_session->consumer,
b178f53e 2769 &uris[i], LTTNG_DOMAIN_UST);
bda32d56
JG
2770 if (ret != LTTNG_OK) {
2771 goto error;
2772 }
2773 }
2774 }
2775
2776 /* Set kernel session URIs */
2777 if (session->kernel_session) {
2778 for (i = 0; i < nb_uri; i++) {
b178f53e 2779 ret = add_uri_to_consumer(session,
bda32d56 2780 session->kernel_session->consumer,
b178f53e 2781 &uris[i], LTTNG_DOMAIN_KERNEL);
bda32d56
JG
2782 if (ret != LTTNG_OK) {
2783 goto error;
2784 }
2785 }
2786 }
2787
7ab70fe0
DG
2788 /*
2789 * Make sure to set the session in output mode after we set URI since a
2790 * session can be created without URL (thus flagged in no output mode).
2791 */
2792 session->output_traces = 1;
2793 if (ksess) {
2794 ksess->output_traces = 1;
bda32d56
JG
2795 }
2796
2797 if (usess) {
7ab70fe0
DG
2798 usess->output_traces = 1;
2799 }
2800
2f77fc4b 2801 /* All good! */
f73fabfd 2802 ret = LTTNG_OK;
2f77fc4b
DG
2803
2804error:
2805 return ret;
2806}
2807
b178f53e
JG
2808static
2809enum lttng_error_code set_session_output_from_descriptor(
2810 struct ltt_session *session,
2811 const struct lttng_session_descriptor *descriptor)
2f77fc4b
DG
2812{
2813 int ret;
b178f53e
JG
2814 enum lttng_error_code ret_code = LTTNG_OK;
2815 enum lttng_session_descriptor_type session_type =
2816 lttng_session_descriptor_get_type(descriptor);
2817 enum lttng_session_descriptor_output_type output_type =
2818 lttng_session_descriptor_get_output_type(descriptor);
2819 struct lttng_uri uris[2] = {};
2820 size_t uri_count = 0;
2821
2822 switch (output_type) {
2823 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NONE:
2824 goto end;
2825 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_LOCAL:
2826 lttng_session_descriptor_get_local_output_uri(descriptor,
2827 &uris[0]);
2828 uri_count = 1;
2829 break;
2830 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NETWORK:
2831 lttng_session_descriptor_get_network_output_uris(descriptor,
2832 &uris[0], &uris[1]);
2833 uri_count = 2;
2834 break;
2835 default:
2836 ret_code = LTTNG_ERR_INVALID;
e32d7f27 2837 goto end;
2f77fc4b
DG
2838 }
2839
b178f53e
JG
2840 switch (session_type) {
2841 case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT:
2842 {
2843 struct snapshot_output *new_output = NULL;
2844
2845 new_output = snapshot_output_alloc();
2846 if (!new_output) {
2847 ret_code = LTTNG_ERR_NOMEM;
2848 goto end;
2849 }
2850
2851 ret = snapshot_output_init_with_uri(session,
2852 DEFAULT_SNAPSHOT_MAX_SIZE,
2853 NULL, uris, uri_count, session->consumer,
2854 new_output, &session->snapshot);
2855 if (ret < 0) {
2856 ret_code = (ret == -ENOMEM) ?
2857 LTTNG_ERR_NOMEM : LTTNG_ERR_INVALID;
2858 snapshot_output_destroy(new_output);
2859 goto end;
2860 }
2861 snapshot_add_output(&session->snapshot, new_output);
2862 break;
2863 }
2864 case LTTNG_SESSION_DESCRIPTOR_TYPE_REGULAR:
2865 case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE:
2866 {
2867 ret_code = cmd_set_consumer_uri(session, uri_count, uris);
2868 break;
2869 }
2870 default:
2871 ret_code = LTTNG_ERR_INVALID;
e32d7f27 2872 goto end;
2f77fc4b 2873 }
b178f53e
JG
2874end:
2875 return ret_code;
2876}
2877
2878static
2879enum lttng_error_code cmd_create_session_from_descriptor(
2880 struct lttng_session_descriptor *descriptor,
2881 const lttng_sock_cred *creds,
2882 const char *home_path)
2883{
2884 int ret;
2885 enum lttng_error_code ret_code;
2886 const char *session_name;
2887 struct ltt_session *new_session = NULL;
2888 enum lttng_session_descriptor_status descriptor_status;
6fa5fe7c 2889 const char *base_path;
2f77fc4b 2890
e32d7f27 2891 session_lock_list();
b178f53e
JG
2892 if (home_path) {
2893 if (*home_path != '/') {
2894 ERR("Home path provided by client is not absolute");
2895 ret_code = LTTNG_ERR_INVALID;
2896 goto end;
2897 }
2898 }
2f77fc4b 2899
b178f53e
JG
2900 descriptor_status = lttng_session_descriptor_get_session_name(
2901 descriptor, &session_name);
2902 switch (descriptor_status) {
2903 case LTTNG_SESSION_DESCRIPTOR_STATUS_OK:
2904 break;
2905 case LTTNG_SESSION_DESCRIPTOR_STATUS_UNSET:
2906 session_name = NULL;
2907 break;
2908 default:
2909 ret_code = LTTNG_ERR_INVALID;
2910 goto end;
2911 }
6fa5fe7c
MD
2912 ret = lttng_session_descriptor_get_base_path(descriptor, &base_path);
2913 if (ret) {
2914 ret_code = LTTNG_ERR_INVALID;
2915 goto end;
2916 }
b178f53e 2917 ret_code = session_create(session_name, creds->uid, creds->gid,
6fa5fe7c 2918 base_path, &new_session);
b178f53e 2919 if (ret_code != LTTNG_OK) {
e32d7f27 2920 goto end;
2f77fc4b
DG
2921 }
2922
b178f53e
JG
2923 if (!session_name) {
2924 ret = lttng_session_descriptor_set_session_name(descriptor,
2925 new_session->name);
2926 if (ret) {
2927 ret_code = LTTNG_ERR_SESSION_FAIL;
2928 goto end;
2929 }
2930 }
2931
2932 if (!lttng_session_descriptor_is_output_destination_initialized(
2933 descriptor)) {
2934 /*
2935 * Only include the session's creation time in the output
2936 * destination if the name of the session itself was
2937 * not auto-generated.
2938 */
2939 ret_code = lttng_session_descriptor_set_default_output(
2940 descriptor,
2941 session_name ? &new_session->creation_time : NULL,
2942 home_path);
2943 if (ret_code != LTTNG_OK) {
e32d7f27 2944 goto end;
2bba9e53 2945 }
2bba9e53 2946 } else {
b178f53e
JG
2947 new_session->has_user_specified_directory =
2948 lttng_session_descriptor_has_output_directory(
2949 descriptor);
2f77fc4b
DG
2950 }
2951
b178f53e
JG
2952 switch (lttng_session_descriptor_get_type(descriptor)) {
2953 case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT:
2954 new_session->snapshot_mode = 1;
2955 break;
2956 case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE:
2957 new_session->live_timer =
2958 lttng_session_descriptor_live_get_timer_interval(
2959 descriptor);
2960 break;
2961 default:
2962 break;
2963 }
2f77fc4b 2964
b178f53e
JG
2965 ret_code = set_session_output_from_descriptor(new_session, descriptor);
2966 if (ret_code != LTTNG_OK) {
2967 goto end;
2968 }
2969 new_session->consumer->enabled = 1;
2970 ret_code = LTTNG_OK;
e32d7f27 2971end:
b178f53e
JG
2972 /* Release reference provided by the session_create function. */
2973 session_put(new_session);
2974 if (ret_code != LTTNG_OK && new_session) {
2975 /* Release the global reference on error. */
2976 session_destroy(new_session);
e32d7f27 2977 }
b178f53e
JG
2978 session_unlock_list();
2979 return ret_code;
2f77fc4b
DG
2980}
2981
b178f53e
JG
2982enum lttng_error_code cmd_create_session(struct command_ctx *cmd_ctx, int sock,
2983 struct lttng_session_descriptor **return_descriptor)
27babd3a
DG
2984{
2985 int ret;
b178f53e
JG
2986 size_t payload_size;
2987 struct lttng_dynamic_buffer payload;
2988 struct lttng_buffer_view home_dir_view;
2989 struct lttng_buffer_view session_descriptor_view;
2990 struct lttng_session_descriptor *session_descriptor = NULL;
2991 enum lttng_error_code ret_code;
2992
2993 lttng_dynamic_buffer_init(&payload);
2994 if (cmd_ctx->lsm->u.create_session.home_dir_size >=
2995 LTTNG_PATH_MAX) {
2996 ret_code = LTTNG_ERR_INVALID;
2997 goto error;
27babd3a 2998 }
b178f53e
JG
2999 if (cmd_ctx->lsm->u.create_session.session_descriptor_size >
3000 LTTNG_SESSION_DESCRIPTOR_MAX_LEN) {
3001 ret_code = LTTNG_ERR_INVALID;
3002 goto error;
27babd3a
DG
3003 }
3004
b178f53e
JG
3005 payload_size = cmd_ctx->lsm->u.create_session.home_dir_size +
3006 cmd_ctx->lsm->u.create_session.session_descriptor_size;
3007 ret = lttng_dynamic_buffer_set_size(&payload, payload_size);
3008 if (ret) {
3009 ret_code = LTTNG_ERR_NOMEM;
3010 goto error;
27babd3a
DG
3011 }
3012
b178f53e
JG
3013 ret = lttcomm_recv_unix_sock(sock, payload.data, payload.size);
3014 if (ret <= 0) {
3015 ERR("Reception of session descriptor failed, aborting.");
3016 ret_code = LTTNG_ERR_SESSION_FAIL;
3017 goto error;
27babd3a
DG
3018 }
3019
b178f53e
JG
3020 home_dir_view = lttng_buffer_view_from_dynamic_buffer(
3021 &payload,
3022 0,
3023 cmd_ctx->lsm->u.create_session.home_dir_size);
3024 session_descriptor_view = lttng_buffer_view_from_dynamic_buffer(
3025 &payload,
3026 cmd_ctx->lsm->u.create_session.home_dir_size,
3027 cmd_ctx->lsm->u.create_session.session_descriptor_size);
27babd3a 3028
b178f53e
JG
3029 ret = lttng_session_descriptor_create_from_buffer(
3030 &session_descriptor_view, &session_descriptor);
3031 if (ret < 0) {
3032 ERR("Failed to create session descriptor from payload of \"create session\" command");
3033 ret_code = LTTNG_ERR_INVALID;
3034 goto error;
3035 }
27babd3a 3036
b178f53e
JG
3037 /*
3038 * Sets the descriptor's auto-generated properties (name, output) if
3039 * needed.
3040 */
3041 ret_code = cmd_create_session_from_descriptor(session_descriptor,
3042 &cmd_ctx->creds,
3043 home_dir_view.size ? home_dir_view.data : NULL);
3044 if (ret_code != LTTNG_OK) {
3045 goto error;
e32d7f27 3046 }
b178f53e
JG
3047
3048 ret_code = LTTNG_OK;
3049 *return_descriptor = session_descriptor;
3050 session_descriptor = NULL;
3051error:
3052 lttng_dynamic_buffer_reset(&payload);
3053 lttng_session_descriptor_destroy(session_descriptor);
3054 return ret_code;
27babd3a
DG
3055}
3056
3e3665b8
JG
3057static
3058void cmd_destroy_session_reply(const struct ltt_session *session,
3059 void *_reply_context)
3060{
3061 int ret;
3062 ssize_t comm_ret;
3063 const struct cmd_destroy_session_reply_context *reply_context =
3064 _reply_context;
3065 struct lttng_dynamic_buffer payload;
3066 struct lttcomm_session_destroy_command_header cmd_header;
3067 struct lttng_trace_archive_location *location = NULL;
3068 struct lttcomm_lttng_msg llm = {
3069 .cmd_type = LTTNG_DESTROY_SESSION,
3070 .ret_code = LTTNG_OK,
3071 .pid = UINT32_MAX,
3072 .cmd_header_size =
3073 sizeof(struct lttcomm_session_destroy_command_header),
3074 .data_size = 0,
3075 };
3076 size_t payload_size_before_location;
3077
3078 lttng_dynamic_buffer_init(&payload);
3079
3080 ret = lttng_dynamic_buffer_append(&payload, &llm, sizeof(llm));
3081 if (ret) {
3082 ERR("Failed to append session destruction message");
3083 goto error;
3084 }
3085
3086 cmd_header.rotation_state =
3087 (int32_t) (reply_context->implicit_rotation_on_destroy ?
3088 session->rotation_state :
3089 LTTNG_ROTATION_STATE_NO_ROTATION);
3090 ret = lttng_dynamic_buffer_append(&payload, &cmd_header,
3091 sizeof(cmd_header));
3092 if (ret) {
3093 ERR("Failed to append session destruction command header");
3094 goto error;
3095 }
3096
3097 if (!reply_context->implicit_rotation_on_destroy) {
3098 DBG("No implicit rotation performed during the destruction of session \"%s\", sending reply",
3099 session->name);
3100 goto send_reply;
3101 }
3102 if (session->rotation_state != LTTNG_ROTATION_STATE_COMPLETED) {
3103 DBG("Rotation state of session \"%s\" is not \"completed\", sending session destruction reply",
3104 session->name);
3105 goto send_reply;
3106 }
3107
3108 location = session_get_trace_archive_location(session);
3109 if (!location) {
3110 ERR("Failed to get the location of the trace archive produced during the destruction of session \"%s\"",
3111 session->name);
3112 goto error;
3113 }
3114
3115 payload_size_before_location = payload.size;
3116 comm_ret = lttng_trace_archive_location_serialize(location,
3117 &payload);
3118 if (comm_ret < 0) {
3119 ERR("Failed to serialize the location of the trace archive produced during the destruction of session \"%s\"",
3120 session->name);
3121 goto error;
3122 }
3123 /* Update the message to indicate the location's length. */
3124 ((struct lttcomm_lttng_msg *) payload.data)->data_size =
3125 payload.size - payload_size_before_location;
3126send_reply:
3127 comm_ret = lttcomm_send_unix_sock(reply_context->reply_sock_fd,
3128 payload.data, payload.size);
3129 if (comm_ret != (ssize_t) payload.size) {
3130 ERR("Failed to send result of the destruction of session \"%s\" to client",
3131 session->name);
3132 }
3133error:
3134 ret = close(reply_context->reply_sock_fd);
3135 if (ret) {
3136 PERROR("Failed to close client socket in deferred session destroy reply");
3137 }
3138 lttng_dynamic_buffer_reset(&payload);
3139 free(_reply_context);
3140}
3141
2f77fc4b
DG
3142/*
3143 * Command LTTNG_DESTROY_SESSION processed by the client thread.
a9ad0c8f
MD
3144 *
3145 * Called with session lock held.
2f77fc4b 3146 */
e32d7f27 3147int cmd_destroy_session(struct ltt_session *session,
3e3665b8
JG
3148 struct notification_thread_handle *notification_thread_handle,
3149 int *sock_fd)
2f77fc4b
DG
3150{
3151 int ret;
3e3665b8
JG
3152 struct cmd_destroy_session_reply_context *reply_context = NULL;
3153
3154 if (sock_fd) {
3155 reply_context = zmalloc(sizeof(*reply_context));
3156 if (!reply_context) {
3157 ret = LTTNG_ERR_NOMEM;
3158 goto end;
3159 }
3160 reply_context->reply_sock_fd = *sock_fd;
3161 }
2f77fc4b
DG
3162
3163 /* Safety net */
3164 assert(session);
3165
3e3665b8
JG
3166 DBG("Begin destroy session %s (id %" PRIu64 ")", session->name,
3167 session->id);
3168 if (session->active) {
3169 DBG("Session \"%s\" is active, attempting to stop it before destroying it",
3170 session->name);
3171 ret = cmd_stop_trace(session);
3172 if (ret != LTTNG_OK && ret != LTTNG_ERR_TRACE_ALREADY_STOPPED) {
3173 /* Carry on with the destruction of the session. */
3174 ERR("Failed to stop session \"%s\" as part of its destruction: %s",
3175 session->name, lttng_strerror(-ret));
3176 }
3177 }
5c408ad8 3178
92816cc3
JG
3179 if (session->rotation_schedule_timer_enabled) {
3180 if (timer_session_rotation_schedule_timer_stop(
3181 session)) {
3182 ERR("Failed to stop the \"rotation schedule\" timer of session %s",
3183 session->name);
3184 }
259c2674
JD
3185 }
3186
90936dcf
JD
3187 if (session->rotate_size) {
3188 unsubscribe_session_consumed_size_rotation(session, notification_thread_handle);
3189 session->rotate_size = 0;
3190 }
3191
d2956687
JG
3192 if (session->most_recent_chunk_id.is_set &&
3193 session->most_recent_chunk_id.value != 0 &&
b5893d8e
JG
3194 session->current_trace_chunk && session->output_traces) {
3195 /*
3196 * Perform a last rotation on destruction if rotations have
3197 * occurred during the session's lifetime.
3198 */
7fdbed1c 3199 ret = cmd_rotate_session(session, NULL, false);
d2956687
JG
3200 if (ret != LTTNG_OK) {
3201 ERR("Failed to perform an implicit rotation as part of the destruction of session \"%s\": %s",
3202 session->name, lttng_strerror(-ret));
124473a3 3203 }
3e3665b8
JG
3204 if (reply_context) {
3205 reply_context->implicit_rotation_on_destroy = true;
3206 }
070b6a86 3207 } else if (session->has_been_started && session->current_trace_chunk) {
7fdbed1c
JG
3208 /*
3209 * The user has not triggered a session rotation. However, to
3210 * ensure all data has been consumed, the session is rotated
3211 * to a 'null' trace chunk before it is destroyed.
3212 *
3213 * This is a "quiet" rotation meaning that no notification is
3214 * emitted and no renaming of the current trace chunk takes
3215 * place.
3216 */
3217 ret = cmd_rotate_session(session, NULL, true);
3218 if (ret != LTTNG_OK) {
3219 ERR("Failed to perform a quiet rotation as part of the destruction of session \"%s\": %s",
3220 session->name, lttng_strerror(-ret));
3221 }
3222 }
5c408ad8 3223
a503e1ef
JG
3224 if (session->shm_path[0]) {
3225 /*
3226 * When a session is created with an explicit shm_path,
3227 * the consumer daemon will create its shared memory files
3228 * at that location and will *not* unlink them. This is normal
3229 * as the intention of that feature is to make it possible
3230 * to retrieve the content of those files should a crash occur.
3231 *
3232 * To ensure the content of those files can be used, the
3233 * sessiond daemon will replicate the content of the metadata
3234 * cache in a metadata file.
3235 *
3236 * On clean-up, it is expected that the consumer daemon will
3237 * unlink the shared memory files and that the session daemon
3238 * will unlink the metadata file. Then, the session's directory
3239 * in the shm path can be removed.
3240 *
3241 * Unfortunately, a flaw in the design of the sessiond's and
3242 * consumerd's tear down of channels makes it impossible to
3243 * determine when the sessiond _and_ the consumerd have both
3244 * destroyed their representation of a channel. For one, the
3245 * unlinking, close, and rmdir happen in deferred 'call_rcu'
3246 * callbacks in both daemons.
3247 *
3248 * However, it is also impossible for the sessiond to know when
3249 * the consumer daemon is done destroying its channel(s) since
3250 * it occurs as a reaction to the closing of the channel's file
3251 * descriptor. There is no resulting communication initiated
3252 * from the consumerd to the sessiond to confirm that the
3253 * operation is completed (and was successful).
3254 *
3255 * Until this is all fixed, the session daemon checks for the
3256 * removal of the session's shm path which makes it possible
3257 * to safely advertise a session as having been destroyed.
3258 *
3259 * Prior to this fix, it was not possible to reliably save
3260 * a session making use of the --shm-path option, destroy it,
3261 * and load it again. This is because the creation of the
3262 * session would fail upon seeing the session's shm path
3263 * already in existence.
3264 *
3265 * Note that none of the error paths in the check for the
3266 * directory's existence return an error. This is normal
3267 * as there isn't much that can be done. The session will
3268 * be destroyed properly, except that we can't offer the
3269 * guarantee that the same session can be re-created.
3270 */
3271 current_completion_handler = &destroy_completion_handler.handler;
3272 ret = lttng_strncpy(destroy_completion_handler.shm_path,
3273 session->shm_path,
3274 sizeof(destroy_completion_handler.shm_path));
3275 assert(!ret);
3276 }
e32d7f27
JG
3277
3278 /*
3279 * The session is destroyed. However, note that the command context
3280 * still holds a reference to the session, thus delaying its destruction
3281 * _at least_ up to the point when that reference is released.
3282 */
3283 session_destroy(session);
3e3665b8
JG
3284 if (reply_context) {
3285 ret = session_add_destroy_notifier(session,
3286 cmd_destroy_session_reply,
3287 (void *) reply_context);
3288 if (ret) {
3289 ret = LTTNG_ERR_FATAL;
3290 goto end;
3291 } else {
3292 *sock_fd = -1;
3293 }
3294 }
3295 ret = LTTNG_OK;
3296end:
2f77fc4b
DG
3297 return ret;
3298}
3299
2f77fc4b
DG
3300/*