sessiond-comm: add clear command support to consumer protocol
[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;
3285a971
JG
76 /*
77 * Indicates whether or not an error occurred while launching the
78 * destruction of a session.
79 */
80 enum lttng_error_code destruction_status;
3e3665b8
JG
81};
82
a503e1ef
JG
83static enum lttng_error_code wait_on_path(void *path);
84
85/*
86 * Command completion handler that is used by the destroy command
87 * when a session that has a non-default shm_path is being destroyed.
88 *
89 * See comment in cmd_destroy_session() for the rationale.
90 */
91static struct destroy_completion_handler {
92 struct cmd_completion_handler handler;
93 char shm_path[member_sizeof(struct ltt_session, shm_path)];
94} destroy_completion_handler = {
95 .handler = {
96 .run = wait_on_path,
97 .data = destroy_completion_handler.shm_path
98 },
99 .shm_path = { 0 },
100};
101
102static struct cmd_completion_handler *current_completion_handler;
103
2f77fc4b
DG
104/*
105 * Used to keep a unique index for each relayd socket created where this value
106 * is associated with streams on the consumer so it can match the right relayd
d88aee68
DG
107 * to send to. It must be accessed with the relayd_net_seq_idx_lock
108 * held.
2f77fc4b 109 */
d88aee68
DG
110static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
111static uint64_t relayd_net_seq_idx;
2f77fc4b 112
7076b56e
JG
113static int validate_ust_event_name(const char *);
114static int cmd_enable_event_internal(struct ltt_session *session,
df4f5a87 115 const struct lttng_domain *domain,
7076b56e
JG
116 char *channel_name, struct lttng_event *event,
117 char *filter_expression,
118 struct lttng_filter_bytecode *filter,
119 struct lttng_event_exclusion *exclusion,
120 int wpipe);
121
2f77fc4b
DG
122/*
123 * Create a session path used by list_lttng_sessions for the case that the
124 * session consumer is on the network.
125 */
126static int build_network_session_path(char *dst, size_t size,
127 struct ltt_session *session)
128{
129 int ret, kdata_port, udata_port;
130 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
131 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
132
133 assert(session);
134 assert(dst);
135
136 memset(tmp_urls, 0, sizeof(tmp_urls));
137 memset(tmp_uurl, 0, sizeof(tmp_uurl));
138
139 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
140
141 if (session->kernel_session && session->kernel_session->consumer) {
142 kuri = &session->kernel_session->consumer->dst.net.control;
143 kdata_port = session->kernel_session->consumer->dst.net.data.port;
144 }
145
146 if (session->ust_session && session->ust_session->consumer) {
147 uuri = &session->ust_session->consumer->dst.net.control;
148 udata_port = session->ust_session->consumer->dst.net.data.port;
149 }
150
151 if (uuri == NULL && kuri == NULL) {
152 uri = &session->consumer->dst.net.control;
153 kdata_port = session->consumer->dst.net.data.port;
154 } else if (kuri && uuri) {
155 ret = uri_compare(kuri, uuri);
156 if (ret) {
157 /* Not Equal */
158 uri = kuri;
159 /* Build uuri URL string */
160 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
161 if (ret < 0) {
162 goto error;
163 }
164 } else {
165 uri = kuri;
166 }
167 } else if (kuri && uuri == NULL) {
168 uri = kuri;
169 } else if (uuri && kuri == NULL) {
170 uri = uuri;
171 }
172
173 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
174 if (ret < 0) {
175 goto error;
176 }
177
9aa9f900
DG
178 /*
179 * Do we have a UST url set. If yes, this means we have both kernel and UST
180 * to print.
181 */
9d035200 182 if (*tmp_uurl != '\0') {
2f77fc4b
DG
183 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
184 tmp_urls, kdata_port, tmp_uurl, udata_port);
185 } else {
9aa9f900 186 int dport;
bef08707 187 if (kuri || (!kuri && !uuri)) {
9aa9f900
DG
188 dport = kdata_port;
189 } else {
190 /* No kernel URI, use the UST port. */
191 dport = udata_port;
192 }
193 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
2f77fc4b
DG
194 }
195
196error:
197 return ret;
198}
199
fb83fe64
JD
200/*
201 * Get run-time attributes if the session has been started (discarded events,
202 * lost packets).
203 */
204static int get_kernel_runtime_stats(struct ltt_session *session,
205 struct ltt_kernel_channel *kchan, uint64_t *discarded_events,
206 uint64_t *lost_packets)
207{
208 int ret;
209
210 if (!session->has_been_started) {
211 ret = 0;
212 *discarded_events = 0;
213 *lost_packets = 0;
214 goto end;
215 }
216
e1f3997a 217 ret = consumer_get_discarded_events(session->id, kchan->key,
fb83fe64
JD
218 session->kernel_session->consumer,
219 discarded_events);
220 if (ret < 0) {
221 goto end;
222 }
223
e1f3997a 224 ret = consumer_get_lost_packets(session->id, kchan->key,
fb83fe64
JD
225 session->kernel_session->consumer,
226 lost_packets);
227 if (ret < 0) {
228 goto end;
229 }
230
231end:
232 return ret;
233}
234
235/*
236 * Get run-time attributes if the session has been started (discarded events,
237 * lost packets).
238 */
239static int get_ust_runtime_stats(struct ltt_session *session,
240 struct ltt_ust_channel *uchan, uint64_t *discarded_events,
241 uint64_t *lost_packets)
242{
243 int ret;
244 struct ltt_ust_session *usess;
245
a91c5803
JG
246 if (!discarded_events || !lost_packets) {
247 ret = -1;
248 goto end;
249 }
250
fb83fe64 251 usess = session->ust_session;
a905c624
JG
252 assert(discarded_events);
253 assert(lost_packets);
fb83fe64
JD
254
255 if (!usess || !session->has_been_started) {
256 *discarded_events = 0;
257 *lost_packets = 0;
258 ret = 0;
259 goto end;
260 }
261
262 if (usess->buffer_type == LTTNG_BUFFER_PER_UID) {
263 ret = ust_app_uid_get_channel_runtime_stats(usess->id,
264 &usess->buffer_reg_uid_list,
265 usess->consumer, uchan->id,
266 uchan->attr.overwrite,
267 discarded_events,
268 lost_packets);
269 } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) {
270 ret = ust_app_pid_get_channel_runtime_stats(usess,
271 uchan, usess->consumer,
272 uchan->attr.overwrite,
273 discarded_events,
274 lost_packets);
275 if (ret < 0) {
276 goto end;
277 }
278 *discarded_events += uchan->per_pid_closed_app_discarded;
279 *lost_packets += uchan->per_pid_closed_app_lost;
280 } else {
281 ERR("Unsupported buffer type");
967bc289 282 assert(0);
fb83fe64
JD
283 ret = -1;
284 goto end;
285 }
286
287end:
288 return ret;
289}
290
2f77fc4b
DG
291/*
292 * Fill lttng_channel array of all channels.
293 */
d449df4a 294static ssize_t list_lttng_channels(enum lttng_domain_type domain,
fb83fe64 295 struct ltt_session *session, struct lttng_channel *channels,
cf0bcb51 296 struct lttng_channel_extended *chan_exts)
2f77fc4b 297{
d449df4a 298 int i = 0, ret = 0;
2f77fc4b
DG
299 struct ltt_kernel_channel *kchan;
300
301 DBG("Listing channels for session %s", session->name);
302
303 switch (domain) {
304 case LTTNG_DOMAIN_KERNEL:
305 /* Kernel channels */
306 if (session->kernel_session != NULL) {
307 cds_list_for_each_entry(kchan,
308 &session->kernel_session->channel_list.head, list) {
fb83fe64 309 uint64_t discarded_events, lost_packets;
cf0bcb51
JG
310 struct lttng_channel_extended *extended;
311
312 extended = (struct lttng_channel_extended *)
313 kchan->channel->attr.extended.ptr;
fb83fe64
JD
314
315 ret = get_kernel_runtime_stats(session, kchan,
316 &discarded_events, &lost_packets);
317 if (ret < 0) {
318 goto end;
319 }
2f77fc4b
DG
320 /* Copy lttng_channel struct to array */
321 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
322 channels[i].enabled = kchan->enabled;
fb83fe64
JD
323 chan_exts[i].discarded_events =
324 discarded_events;
325 chan_exts[i].lost_packets = lost_packets;
cf0bcb51
JG
326 chan_exts[i].monitor_timer_interval =
327 extended->monitor_timer_interval;
491d1539 328 chan_exts[i].blocking_timeout = 0;
2f77fc4b
DG
329 i++;
330 }
331 }
332 break;
333 case LTTNG_DOMAIN_UST:
334 {
335 struct lttng_ht_iter iter;
336 struct ltt_ust_channel *uchan;
337
e7fe706f 338 rcu_read_lock();
2f77fc4b
DG
339 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
340 &iter.iter, uchan, node.node) {
a91c5803 341 uint64_t discarded_events = 0, lost_packets = 0;
fb83fe64 342
8ee609c8
MD
343 if (lttng_strncpy(channels[i].name, uchan->name,
344 LTTNG_SYMBOL_NAME_LEN)) {
345 break;
346 }
2f77fc4b
DG
347 channels[i].attr.overwrite = uchan->attr.overwrite;
348 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
349 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
350 channels[i].attr.switch_timer_interval =
351 uchan->attr.switch_timer_interval;
352 channels[i].attr.read_timer_interval =
353 uchan->attr.read_timer_interval;
354 channels[i].enabled = uchan->enabled;
2f785fe7
DG
355 channels[i].attr.tracefile_size = uchan->tracefile_size;
356 channels[i].attr.tracefile_count = uchan->tracefile_count;
5e4435a4
JG
357
358 /*
359 * Map enum lttng_ust_output to enum lttng_event_output.
360 */
2f77fc4b
DG
361 switch (uchan->attr.output) {
362 case LTTNG_UST_MMAP:
2f77fc4b
DG
363 channels[i].attr.output = LTTNG_EVENT_MMAP;
364 break;
5e4435a4
JG
365 default:
366 /*
367 * LTTNG_UST_MMAP is the only supported UST
368 * output mode.
369 */
370 assert(0);
371 break;
2f77fc4b 372 }
fb83fe64 373
d449df4a
MD
374 chan_exts[i].monitor_timer_interval =
375 uchan->monitor_timer_interval;
491d1539
MD
376 chan_exts[i].blocking_timeout =
377 uchan->attr.u.s.blocking_timeout;
d449df4a 378
fb83fe64
JD
379 ret = get_ust_runtime_stats(session, uchan,
380 &discarded_events, &lost_packets);
381 if (ret < 0) {
382 break;
383 }
384 chan_exts[i].discarded_events = discarded_events;
385 chan_exts[i].lost_packets = lost_packets;
2f77fc4b
DG
386 i++;
387 }
e7fe706f 388 rcu_read_unlock();
2f77fc4b
DG
389 break;
390 }
391 default:
392 break;
393 }
fb83fe64
JD
394
395end:
d449df4a
MD
396 if (ret < 0) {
397 return -LTTNG_ERR_FATAL;
398 } else {
399 return LTTNG_OK;
400 }
2f77fc4b
DG
401}
402
3c02e545
FD
403static int increment_extended_len(const char *filter_expression,
404 struct lttng_event_exclusion *exclusion,
405 const struct lttng_userspace_probe_location *probe_location,
406 size_t *extended_len)
b4e3ceb9 407{
3c02e545
FD
408 int ret = 0;
409
b4e3ceb9
PP
410 *extended_len += sizeof(struct lttcomm_event_extended_header);
411
412 if (filter_expression) {
413 *extended_len += strlen(filter_expression) + 1;
414 }
795d57ce
PP
415
416 if (exclusion) {
417 *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN;
418 }
3c02e545
FD
419
420 if (probe_location) {
421 ret = lttng_userspace_probe_location_serialize(probe_location,
422 NULL, NULL);
423 if (ret < 0) {
424 goto end;
425 }
426 *extended_len += ret;
427 }
428 ret = 0;
429end:
430 return ret;
b4e3ceb9
PP
431}
432
3c02e545
FD
433static int append_extended_info(const char *filter_expression,
434 struct lttng_event_exclusion *exclusion,
435 struct lttng_userspace_probe_location *probe_location,
436 void **extended_at)
b4e3ceb9 437{
3c02e545 438 int ret = 0;
b4e3ceb9 439 size_t filter_len = 0;
795d57ce 440 size_t nb_exclusions = 0;
3c02e545
FD
441 size_t userspace_probe_location_len = 0;
442 struct lttng_dynamic_buffer location_buffer;
443 struct lttcomm_event_extended_header extended_header;
b4e3ceb9
PP
444
445 if (filter_expression) {
446 filter_len = strlen(filter_expression) + 1;
447 }
448
795d57ce
PP
449 if (exclusion) {
450 nb_exclusions = exclusion->count;
451 }
452
3c02e545
FD
453 if (probe_location) {
454 lttng_dynamic_buffer_init(&location_buffer);
455 ret = lttng_userspace_probe_location_serialize(probe_location,
456 &location_buffer, NULL);
457 if (ret < 0) {
458 ret = -1;
459 goto end;
460 }
461 userspace_probe_location_len = location_buffer.size;
462 }
463
795d57ce 464 /* Set header fields */
b4e3ceb9 465 extended_header.filter_len = filter_len;
795d57ce 466 extended_header.nb_exclusions = nb_exclusions;
3c02e545 467 extended_header.userspace_probe_location_len = userspace_probe_location_len;
795d57ce
PP
468
469 /* Copy header */
b4e3ceb9
PP
470 memcpy(*extended_at, &extended_header, sizeof(extended_header));
471 *extended_at += sizeof(extended_header);
795d57ce
PP
472
473 /* Copy filter string */
474 if (filter_expression) {
475 memcpy(*extended_at, filter_expression, filter_len);
476 *extended_at += filter_len;
477 }
478
479 /* Copy exclusion names */
480 if (exclusion) {
481 size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
482
483 memcpy(*extended_at, &exclusion->names, len);
484 *extended_at += len;
485 }
3c02e545
FD
486
487 if (probe_location) {
488 memcpy(*extended_at, location_buffer.data, location_buffer.size);
489 *extended_at += location_buffer.size;
490 lttng_dynamic_buffer_reset(&location_buffer);
491 }
492 ret = 0;
493end:
494 return ret;
b4e3ceb9
PP
495}
496
3c6a091f 497/*
022d91ba 498 * Create a list of agent domain events.
3c6a091f
DG
499 *
500 * Return number of events in list on success or else a negative value.
501 */
022d91ba 502static int list_lttng_agent_events(struct agent *agt,
b4e3ceb9 503 struct lttng_event **events, size_t *total_size)
3c6a091f
DG
504{
505 int i = 0, ret = 0;
506 unsigned int nb_event = 0;
022d91ba 507 struct agent_event *event;
47e52862 508 struct lttng_event *tmp_events = NULL;
3c6a091f 509 struct lttng_ht_iter iter;
b4e3ceb9
PP
510 size_t extended_len = 0;
511 void *extended_at;
3c6a091f 512
022d91ba 513 assert(agt);
3c6a091f
DG
514 assert(events);
515
022d91ba 516 DBG3("Listing agent events");
3c6a091f 517
e5bbf678 518 rcu_read_lock();
022d91ba 519 nb_event = lttng_ht_get_count(agt->events);
e5bbf678 520 rcu_read_unlock();
3c6a091f
DG
521 if (nb_event == 0) {
522 ret = nb_event;
b4e3ceb9 523 *total_size = 0;
3c6a091f
DG
524 goto error;
525 }
526
b4e3ceb9
PP
527 /* Compute required extended infos size */
528 extended_len = nb_event * sizeof(struct lttcomm_event_extended_header);
529
530 /*
531 * This is only valid because the commands which add events are
532 * processed in the same thread as the listing.
533 */
534 rcu_read_lock();
535 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
3c02e545 536 ret = increment_extended_len(event->filter_expression, NULL, NULL,
795d57ce 537 &extended_len);
3c02e545
FD
538 if (ret) {
539 DBG("Error computing the length of extended info message");
540 ret = -LTTNG_ERR_FATAL;
541 goto error;
542 }
b4e3ceb9
PP
543 }
544 rcu_read_unlock();
545
546 *total_size = nb_event * sizeof(*tmp_events) + extended_len;
547 tmp_events = zmalloc(*total_size);
3c6a091f 548 if (!tmp_events) {
022d91ba 549 PERROR("zmalloc agent events session");
3c6a091f
DG
550 ret = -LTTNG_ERR_FATAL;
551 goto error;
552 }
553
b4e3ceb9
PP
554 extended_at = ((uint8_t *) tmp_events) +
555 nb_event * sizeof(struct lttng_event);
556
3c6a091f 557 rcu_read_lock();
022d91ba 558 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
3c6a091f
DG
559 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
560 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
561 tmp_events[i].enabled = event->enabled;
2106efa0 562 tmp_events[i].loglevel = event->loglevel_value;
ff94328f 563 tmp_events[i].loglevel_type = event->loglevel_type;
3c6a091f 564 i++;
b4e3ceb9
PP
565
566 /* Append extended info */
3c02e545 567 ret = append_extended_info(event->filter_expression, NULL, NULL,
795d57ce 568 &extended_at);
3c02e545
FD
569 if (ret) {
570 DBG("Error appending extended info message");
571 ret = -LTTNG_ERR_FATAL;
572 goto error;
573 }
3c6a091f 574 }
3c6a091f
DG
575
576 *events = tmp_events;
577 ret = nb_event;
3c02e545 578 assert(nb_event == i);
3c6a091f 579
47e52862 580end:
3c02e545 581 rcu_read_unlock();
3c6a091f 582 return ret;
47e52862
JG
583error:
584 free(tmp_events);
585 goto end;
3c6a091f
DG
586}
587
2f77fc4b
DG
588/*
589 * Create a list of ust global domain events.
590 */
591static int list_lttng_ust_global_events(char *channel_name,
b4e3ceb9
PP
592 struct ltt_ust_domain_global *ust_global,
593 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
594{
595 int i = 0, ret = 0;
596 unsigned int nb_event = 0;
597 struct lttng_ht_iter iter;
598 struct lttng_ht_node_str *node;
599 struct ltt_ust_channel *uchan;
600 struct ltt_ust_event *uevent;
601 struct lttng_event *tmp;
b4e3ceb9
PP
602 size_t extended_len = 0;
603 void *extended_at;
2f77fc4b
DG
604
605 DBG("Listing UST global events for channel %s", channel_name);
606
607 rcu_read_lock();
608
609 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
610 node = lttng_ht_iter_get_node_str(&iter);
611 if (node == NULL) {
f73fabfd 612 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
d31d3e8c 613 goto end;
2f77fc4b
DG
614 }
615
616 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
617
3c442be3 618 nb_event = lttng_ht_get_count(uchan->events);
2f77fc4b
DG
619 if (nb_event == 0) {
620 ret = nb_event;
b4e3ceb9 621 *total_size = 0;
d31d3e8c 622 goto end;
2f77fc4b
DG
623 }
624
625 DBG3("Listing UST global %d events", nb_event);
626
b4e3ceb9
PP
627 /* Compute required extended infos size */
628 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
629 if (uevent->internal) {
630 nb_event--;
631 continue;
632 }
633
3c02e545
FD
634 ret = increment_extended_len(uevent->filter_expression,
635 uevent->exclusion, NULL, &extended_len);
636 if (ret) {
637 DBG("Error computing the length of extended info message");
638 ret = -LTTNG_ERR_FATAL;
639 goto end;
640 }
b4e3ceb9 641 }
d31d3e8c
PP
642 if (nb_event == 0) {
643 /* All events are internal, skip. */
644 ret = 0;
645 *total_size = 0;
646 goto end;
647 }
b4e3ceb9
PP
648
649 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
650 tmp = zmalloc(*total_size);
2f77fc4b 651 if (tmp == NULL) {
b12c38df
JG
652 ret = -LTTNG_ERR_FATAL;
653 goto end;
2f77fc4b
DG
654 }
655
b4e3ceb9
PP
656 extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event);
657
2f77fc4b 658 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
3c442be3
JG
659 if (uevent->internal) {
660 /* This event should remain hidden from clients */
3c442be3
JG
661 continue;
662 }
2f77fc4b
DG
663 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
664 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
665 tmp[i].enabled = uevent->enabled;
666
667 switch (uevent->attr.instrumentation) {
668 case LTTNG_UST_TRACEPOINT:
669 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
670 break;
671 case LTTNG_UST_PROBE:
672 tmp[i].type = LTTNG_EVENT_PROBE;
673 break;
674 case LTTNG_UST_FUNCTION:
675 tmp[i].type = LTTNG_EVENT_FUNCTION;
676 break;
677 }
678
679 tmp[i].loglevel = uevent->attr.loglevel;
680 switch (uevent->attr.loglevel_type) {
681 case LTTNG_UST_LOGLEVEL_ALL:
682 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
683 break;
684 case LTTNG_UST_LOGLEVEL_RANGE:
685 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
686 break;
687 case LTTNG_UST_LOGLEVEL_SINGLE:
688 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
689 break;
690 }
691 if (uevent->filter) {
692 tmp[i].filter = 1;
693 }
4634f12e
JI
694 if (uevent->exclusion) {
695 tmp[i].exclusion = 1;
696 }
2f77fc4b 697 i++;
b4e3ceb9
PP
698
699 /* Append extended info */
3c02e545
FD
700 ret = append_extended_info(uevent->filter_expression,
701 uevent->exclusion, NULL, &extended_at);
702 if (ret) {
703 DBG("Error appending extended info message");
704 ret = -LTTNG_ERR_FATAL;
705 goto end;
706 }
2f77fc4b
DG
707 }
708
709 ret = nb_event;
710 *events = tmp;
d31d3e8c 711end:
2f77fc4b
DG
712 rcu_read_unlock();
713 return ret;
714}
715
716/*
717 * Fill lttng_event array of all kernel events in the channel.
718 */
719static int list_lttng_kernel_events(char *channel_name,
b4e3ceb9
PP
720 struct ltt_kernel_session *kernel_session,
721 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
722{
723 int i = 0, ret;
724 unsigned int nb_event;
725 struct ltt_kernel_event *event;
726 struct ltt_kernel_channel *kchan;
b4e3ceb9
PP
727 size_t extended_len = 0;
728 void *extended_at;
2f77fc4b
DG
729
730 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
731 if (kchan == NULL) {
f73fabfd 732 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG
733 goto error;
734 }
735
736 nb_event = kchan->event_count;
737
738 DBG("Listing events for channel %s", kchan->channel->name);
739
740 if (nb_event == 0) {
b4e3ceb9 741 *total_size = 0;
834978fd 742 *events = NULL;
db906c12 743 goto end;
2f77fc4b
DG
744 }
745
b4e3ceb9
PP
746 /* Compute required extended infos size */
747 cds_list_for_each_entry(event, &kchan->events_list.head, list) {
3c02e545
FD
748 ret = increment_extended_len(event->filter_expression, NULL,
749 event->userspace_probe_location,
795d57ce 750 &extended_len);
3c02e545
FD
751 if (ret) {
752 DBG("Error computing the length of extended info message");
753 ret = -LTTNG_ERR_FATAL;
754 goto error;
755 }
b4e3ceb9
PP
756 }
757
758 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
759 *events = zmalloc(*total_size);
2f77fc4b 760 if (*events == NULL) {
3c02e545 761 ret = -LTTNG_ERR_FATAL;
2f77fc4b
DG
762 goto error;
763 }
764
ab4aa612 765 extended_at = ((void *) *events) +
b4e3ceb9
PP
766 nb_event * sizeof(struct lttng_event);
767
2f77fc4b
DG
768 /* Kernel channels */
769 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
770 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
771 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
772 (*events)[i].enabled = event->enabled;
00f992f2
JG
773 (*events)[i].filter =
774 (unsigned char) !!event->filter_expression;
2f77fc4b
DG
775
776 switch (event->event->instrumentation) {
777 case LTTNG_KERNEL_TRACEPOINT:
778 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
779 break;
2f77fc4b 780 case LTTNG_KERNEL_KRETPROBE:
1896972b
DG
781 (*events)[i].type = LTTNG_EVENT_FUNCTION;
782 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
783 sizeof(struct lttng_kernel_kprobe));
784 break;
785 case LTTNG_KERNEL_KPROBE:
2f77fc4b
DG
786 (*events)[i].type = LTTNG_EVENT_PROBE;
787 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
788 sizeof(struct lttng_kernel_kprobe));
789 break;
b955b4d4
FD
790 case LTTNG_KERNEL_UPROBE:
791 (*events)[i].type = LTTNG_EVENT_USERSPACE_PROBE;
792 break;
2f77fc4b
DG
793 case LTTNG_KERNEL_FUNCTION:
794 (*events)[i].type = LTTNG_EVENT_FUNCTION;
795 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
796 sizeof(struct lttng_kernel_function));
797 break;
798 case LTTNG_KERNEL_NOOP:
799 (*events)[i].type = LTTNG_EVENT_NOOP;
800 break;
801 case LTTNG_KERNEL_SYSCALL:
802 (*events)[i].type = LTTNG_EVENT_SYSCALL;
803 break;
804 case LTTNG_KERNEL_ALL:
1ab8c2ad
FD
805 /* fall-through. */
806 default:
2f77fc4b
DG
807 assert(0);
808 break;
809 }
810 i++;
b4e3ceb9
PP
811
812 /* Append extended info */
3c02e545
FD
813 ret = append_extended_info(event->filter_expression, NULL,
814 event->userspace_probe_location, &extended_at);
815 if (ret) {
816 DBG("Error appending extended info message");
817 ret = -LTTNG_ERR_FATAL;
818 goto error;
819 }
2f77fc4b
DG
820 }
821
db906c12 822end:
2f77fc4b
DG
823 return nb_event;
824
825error:
f73fabfd
DG
826 /* Negate the error code to differentiate the size from an error */
827 return -ret;
2f77fc4b
DG
828}
829
830/*
831 * Add URI so the consumer output object. Set the correct path depending on the
832 * domain adding the default trace directory.
833 */
b178f53e
JG
834static enum lttng_error_code add_uri_to_consumer(
835 const struct ltt_session *session,
836 struct consumer_output *consumer,
837 struct lttng_uri *uri, enum lttng_domain_type domain)
2f77fc4b 838{
b178f53e
JG
839 int ret;
840 enum lttng_error_code ret_code = LTTNG_OK;
2f77fc4b
DG
841
842 assert(uri);
843
844 if (consumer == NULL) {
845 DBG("No consumer detected. Don't add URI. Stopping.");
b178f53e 846 ret_code = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
847 goto error;
848 }
849
850 switch (domain) {
851 case LTTNG_DOMAIN_KERNEL:
b178f53e
JG
852 ret = lttng_strncpy(consumer->domain_subdir,
853 DEFAULT_KERNEL_TRACE_DIR,
854 sizeof(consumer->domain_subdir));
2f77fc4b
DG
855 break;
856 case LTTNG_DOMAIN_UST:
b178f53e
JG
857 ret = lttng_strncpy(consumer->domain_subdir,
858 DEFAULT_UST_TRACE_DIR,
859 sizeof(consumer->domain_subdir));
2f77fc4b
DG
860 break;
861 default:
862 /*
b178f53e
JG
863 * This case is possible is we try to add the URI to the global
864 * tracing session consumer object which in this case there is
865 * no subdir.
2f77fc4b 866 */
b178f53e
JG
867 memset(consumer->domain_subdir, 0,
868 sizeof(consumer->domain_subdir));
869 ret = 0;
870 }
871 if (ret) {
872 ERR("Failed to initialize consumer output domain subdirectory");
873 ret_code = LTTNG_ERR_FATAL;
874 goto error;
2f77fc4b
DG
875 }
876
877 switch (uri->dtype) {
878 case LTTNG_DST_IPV4:
879 case LTTNG_DST_IPV6:
880 DBG2("Setting network URI to consumer");
881
df75acac
DG
882 if (consumer->type == CONSUMER_DST_NET) {
883 if ((uri->stype == LTTNG_STREAM_CONTROL &&
785d2d0d
DG
884 consumer->dst.net.control_isset) ||
885 (uri->stype == LTTNG_STREAM_DATA &&
886 consumer->dst.net.data_isset)) {
b178f53e 887 ret_code = LTTNG_ERR_URL_EXIST;
df75acac
DG
888 goto error;
889 }
890 } else {
b178f53e 891 memset(&consumer->dst, 0, sizeof(consumer->dst));
785d2d0d
DG
892 }
893
2f77fc4b 894 /* Set URI into consumer output object */
b178f53e 895 ret = consumer_set_network_uri(session, consumer, uri);
2f77fc4b 896 if (ret < 0) {
b178f53e 897 ret_code = -ret;
2f77fc4b
DG
898 goto error;
899 } else if (ret == 1) {
900 /*
901 * URI was the same in the consumer so we do not append the subdir
902 * again so to not duplicate output dir.
903 */
b178f53e 904 ret_code = LTTNG_OK;
2f77fc4b
DG
905 goto error;
906 }
2f77fc4b
DG
907 break;
908 case LTTNG_DST_PATH:
b178f53e
JG
909 if (*uri->dst.path != '/' || strstr(uri->dst.path, "../")) {
910 ret_code = LTTNG_ERR_INVALID;
9ac05d92
MD
911 goto error;
912 }
b178f53e
JG
913 DBG2("Setting trace directory path from URI to %s",
914 uri->dst.path);
915 memset(&consumer->dst, 0, sizeof(consumer->dst));
916
917 ret = lttng_strncpy(consumer->dst.session_root_path,
918 uri->dst.path,
919 sizeof(consumer->dst.session_root_path));
4df41cad
JG
920 if (ret) {
921 ret_code = LTTNG_ERR_FATAL;
922 goto error;
923 }
2f77fc4b
DG
924 consumer->type = CONSUMER_DST_LOCAL;
925 break;
926 }
927
b178f53e 928 ret_code = LTTNG_OK;
2f77fc4b 929error:
b178f53e 930 return ret_code;
2f77fc4b
DG
931}
932
933/*
934 * Init tracing by creating trace directory and sending fds kernel consumer.
935 */
936static int init_kernel_tracing(struct ltt_kernel_session *session)
937{
938 int ret = 0;
939 struct lttng_ht_iter iter;
940 struct consumer_socket *socket;
941
942 assert(session);
943
e7fe706f
DG
944 rcu_read_lock();
945
2f77fc4b
DG
946 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
947 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
948 socket, node.node) {
2f77fc4b 949 pthread_mutex_lock(socket->lock);
f50f23d9 950 ret = kernel_consumer_send_session(socket, session);
2f77fc4b
DG
951 pthread_mutex_unlock(socket->lock);
952 if (ret < 0) {
f73fabfd 953 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
954 goto error;
955 }
956 }
957 }
958
959error:
e7fe706f 960 rcu_read_unlock();
2f77fc4b
DG
961 return ret;
962}
963
964/*
965 * Create a socket to the relayd using the URI.
966 *
967 * On success, the relayd_sock pointer is set to the created socket.
9a654598 968 * Else, it remains untouched and an LTTng error code is returned.
2f77fc4b 969 */
9a654598 970static enum lttng_error_code create_connect_relayd(struct lttng_uri *uri,
b31610f2
JD
971 struct lttcomm_relayd_sock **relayd_sock,
972 struct consumer_output *consumer)
2f77fc4b
DG
973{
974 int ret;
9a654598 975 enum lttng_error_code status = LTTNG_OK;
6151a90f 976 struct lttcomm_relayd_sock *rsock;
2f77fc4b 977
6151a90f
JD
978 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
979 RELAYD_VERSION_COMM_MINOR);
980 if (!rsock) {
9a654598 981 status = LTTNG_ERR_FATAL;
2f77fc4b
DG
982 goto error;
983 }
984
ffe60014
DG
985 /*
986 * Connect to relayd so we can proceed with a session creation. This call
987 * can possibly block for an arbitrary amount of time to set the health
988 * state to be in poll execution.
989 */
990 health_poll_entry();
6151a90f 991 ret = relayd_connect(rsock);
ffe60014 992 health_poll_exit();
2f77fc4b
DG
993 if (ret < 0) {
994 ERR("Unable to reach lttng-relayd");
9a654598 995 status = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG
996 goto free_sock;
997 }
998
999 /* Create socket for control stream. */
1000 if (uri->stype == LTTNG_STREAM_CONTROL) {
1001 DBG3("Creating relayd stream socket from URI");
1002
1003 /* Check relayd version */
6151a90f 1004 ret = relayd_version_check(rsock);
67d5aa28 1005 if (ret == LTTNG_ERR_RELAYD_VERSION_FAIL) {
9a654598 1006 status = LTTNG_ERR_RELAYD_VERSION_FAIL;
67d5aa28
JD
1007 goto close_sock;
1008 } else if (ret < 0) {
1009 ERR("Unable to reach lttng-relayd");
9a654598 1010 status = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG
1011 goto close_sock;
1012 }
b31610f2
JD
1013 consumer->relay_major_version = rsock->major;
1014 consumer->relay_minor_version = rsock->minor;
2f77fc4b
DG
1015 } else if (uri->stype == LTTNG_STREAM_DATA) {
1016 DBG3("Creating relayd data socket from URI");
1017 } else {
1018 /* Command is not valid */
1019 ERR("Relayd invalid stream type: %d", uri->stype);
9a654598 1020 status = LTTNG_ERR_INVALID;
2f77fc4b
DG
1021 goto close_sock;
1022 }
1023
6151a90f 1024 *relayd_sock = rsock;
2f77fc4b 1025
9a654598 1026 return status;
2f77fc4b
DG
1027
1028close_sock:
6151a90f
JD
1029 /* The returned value is not useful since we are on an error path. */
1030 (void) relayd_close(rsock);
2f77fc4b 1031free_sock:
6151a90f 1032 free(rsock);
2f77fc4b 1033error:
9a654598 1034 return status;
2f77fc4b
DG
1035}
1036
1037/*
1038 * Connect to the relayd using URI and send the socket to the right consumer.
43fade62
JG
1039 *
1040 * The consumer socket lock must be held by the caller.
9a654598
JG
1041 *
1042 * Returns LTTNG_OK on success or an LTTng error code on failure.
2f77fc4b 1043 */
9a654598
JG
1044static enum lttng_error_code send_consumer_relayd_socket(
1045 unsigned int session_id,
3044f922 1046 struct lttng_uri *relayd_uri,
56a37563 1047 struct consumer_output *consumer,
d3e2ba59 1048 struct consumer_socket *consumer_sock,
fb9a95c4 1049 const char *session_name, const char *hostname,
6fa5fe7c 1050 const char *base_path, int session_live_timer,
db1da059 1051 const uint64_t *current_chunk_id,
46ef2188
MD
1052 time_t session_creation_time,
1053 bool session_name_contains_creation_time)
2f77fc4b
DG
1054{
1055 int ret;
6151a90f 1056 struct lttcomm_relayd_sock *rsock = NULL;
9a654598 1057 enum lttng_error_code status;
2f77fc4b 1058
ffe60014 1059 /* Connect to relayd and make version check if uri is the control. */
9a654598
JG
1060 status = create_connect_relayd(relayd_uri, &rsock, consumer);
1061 if (status != LTTNG_OK) {
9e218353 1062 goto relayd_comm_error;
ffe60014 1063 }
6151a90f 1064 assert(rsock);
ffe60014 1065
2f77fc4b 1066 /* Set the network sequence index if not set. */
d88aee68
DG
1067 if (consumer->net_seq_index == (uint64_t) -1ULL) {
1068 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
1069 /*
1070 * Increment net_seq_idx because we are about to transfer the
1071 * new relayd socket to the consumer.
d88aee68 1072 * Assign unique key so the consumer can match streams.
2f77fc4b 1073 */
d88aee68
DG
1074 consumer->net_seq_index = ++relayd_net_seq_idx;
1075 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
1076 }
1077
2f77fc4b 1078 /* Send relayd socket to consumer. */
6151a90f 1079 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
d3e2ba59 1080 relayd_uri->stype, session_id,
6fa5fe7c
MD
1081 session_name, hostname, base_path,
1082 session_live_timer, current_chunk_id,
46ef2188 1083 session_creation_time, session_name_contains_creation_time);
2f77fc4b 1084 if (ret < 0) {
9a654598 1085 status = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
1086 goto close_sock;
1087 }
1088
c890b720
DG
1089 /* Flag that the corresponding socket was sent. */
1090 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
ffe60014 1091 consumer_sock->control_sock_sent = 1;
c890b720 1092 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
ffe60014 1093 consumer_sock->data_sock_sent = 1;
c890b720
DG
1094 }
1095
2f77fc4b
DG
1096 /*
1097 * Close socket which was dup on the consumer side. The session daemon does
1098 * NOT keep track of the relayd socket(s) once transfer to the consumer.
1099 */
1100
1101close_sock:
9a654598 1102 if (status != LTTNG_OK) {
ffe60014 1103 /*
d9078d0c
DG
1104 * The consumer output for this session should not be used anymore
1105 * since the relayd connection failed thus making any tracing or/and
1106 * streaming not usable.
ffe60014 1107 */
d9078d0c 1108 consumer->enabled = 0;
ffe60014 1109 }
9e218353
JR
1110 (void) relayd_close(rsock);
1111 free(rsock);
1112
1113relayd_comm_error:
9a654598 1114 return status;
2f77fc4b
DG
1115}
1116
1117/*
1118 * Send both relayd sockets to a specific consumer and domain. This is a
1119 * helper function to facilitate sending the information to the consumer for a
1120 * session.
43fade62
JG
1121 *
1122 * The consumer socket lock must be held by the caller.
9a654598
JG
1123 *
1124 * Returns LTTNG_OK, or an LTTng error code on failure.
2f77fc4b 1125 */
9a654598
JG
1126static enum lttng_error_code send_consumer_relayd_sockets(
1127 enum lttng_domain_type domain,
56a37563 1128 unsigned int session_id, struct consumer_output *consumer,
fb9a95c4 1129 struct consumer_socket *sock, const char *session_name,
6fa5fe7c 1130 const char *hostname, const char *base_path, int session_live_timer,
46ef2188
MD
1131 const uint64_t *current_chunk_id, time_t session_creation_time,
1132 bool session_name_contains_creation_time)
2f77fc4b 1133{
9a654598 1134 enum lttng_error_code status = LTTNG_OK;
2f77fc4b 1135
2f77fc4b 1136 assert(consumer);
6dc3064a 1137 assert(sock);
2f77fc4b 1138
2f77fc4b 1139 /* Sending control relayd socket. */
ffe60014 1140 if (!sock->control_sock_sent) {
9a654598 1141 status = send_consumer_relayd_socket(session_id,
d3e2ba59 1142 &consumer->dst.net.control, consumer, sock,
6fa5fe7c 1143 session_name, hostname, base_path, session_live_timer,
46ef2188
MD
1144 current_chunk_id, session_creation_time,
1145 session_name_contains_creation_time);
9a654598 1146 if (status != LTTNG_OK) {
c890b720
DG
1147 goto error;
1148 }
2f77fc4b
DG
1149 }
1150
1151 /* Sending data relayd socket. */
ffe60014 1152 if (!sock->data_sock_sent) {
9a654598 1153 status = send_consumer_relayd_socket(session_id,
d3e2ba59 1154 &consumer->dst.net.data, consumer, sock,
6fa5fe7c 1155 session_name, hostname, base_path, session_live_timer,
46ef2188
MD
1156 current_chunk_id, session_creation_time,
1157 session_name_contains_creation_time);
9a654598 1158 if (status != LTTNG_OK) {
c890b720
DG
1159 goto error;
1160 }
2f77fc4b
DG
1161 }
1162
2f77fc4b 1163error:
9a654598 1164 return status;
2f77fc4b
DG
1165}
1166
1167/*
1168 * Setup relayd connections for a tracing session. First creates the socket to
1169 * the relayd and send them to the right domain consumer. Consumer type MUST be
1170 * network.
1171 */
ffe60014 1172int cmd_setup_relayd(struct ltt_session *session)
2f77fc4b 1173{
f73fabfd 1174 int ret = LTTNG_OK;
2f77fc4b
DG
1175 struct ltt_ust_session *usess;
1176 struct ltt_kernel_session *ksess;
1177 struct consumer_socket *socket;
1178 struct lttng_ht_iter iter;
1e791a74 1179 LTTNG_OPTIONAL(uint64_t) current_chunk_id = {};
2f77fc4b 1180
1e791a74 1181 assert(session);
2f77fc4b
DG
1182
1183 usess = session->ust_session;
1184 ksess = session->kernel_session;
1185
785d2d0d 1186 DBG("Setting relayd for session %s", session->name);
2f77fc4b 1187
aa997ea3 1188 rcu_read_lock();
1e791a74
JG
1189 if (session->current_trace_chunk) {
1190 enum lttng_trace_chunk_status status = lttng_trace_chunk_get_id(
1191 session->current_trace_chunk, &current_chunk_id.value);
1192
1193 if (status == LTTNG_TRACE_CHUNK_STATUS_OK) {
1194 current_chunk_id.is_set = true;
1195 } else {
1196 ERR("Failed to get current trace chunk id");
1197 ret = LTTNG_ERR_UNK;
1198 goto error;
1199 }
1200 }
1201
2f77fc4b
DG
1202 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
1203 && usess->consumer->enabled) {
1204 /* For each consumer socket, send relayd sockets */
1205 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
1206 socket, node.node) {
2f77fc4b 1207 pthread_mutex_lock(socket->lock);
6dc3064a 1208 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
d3e2ba59
JD
1209 usess->consumer, socket,
1210 session->name, session->hostname,
6fa5fe7c 1211 session->base_path,
1e791a74 1212 session->live_timer,
db1da059 1213 current_chunk_id.is_set ? &current_chunk_id.value : NULL,
46ef2188
MD
1214 session->creation_time,
1215 session->name_contains_creation_time);
2f77fc4b 1216 pthread_mutex_unlock(socket->lock);
f73fabfd 1217 if (ret != LTTNG_OK) {
2f77fc4b
DG
1218 goto error;
1219 }
6dc3064a
DG
1220 /* Session is now ready for network streaming. */
1221 session->net_handle = 1;
2f77fc4b 1222 }
b31610f2
JD
1223 session->consumer->relay_major_version =
1224 usess->consumer->relay_major_version;
1225 session->consumer->relay_minor_version =
1226 usess->consumer->relay_minor_version;
2f77fc4b
DG
1227 }
1228
1229 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
1230 && ksess->consumer->enabled) {
1231 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
1232 socket, node.node) {
2f77fc4b 1233 pthread_mutex_lock(socket->lock);
6dc3064a 1234 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
d3e2ba59
JD
1235 ksess->consumer, socket,
1236 session->name, session->hostname,
6fa5fe7c 1237 session->base_path,
1e791a74 1238 session->live_timer,
db1da059 1239 current_chunk_id.is_set ? &current_chunk_id.value : NULL,
46ef2188
MD
1240 session->creation_time,
1241 session->name_contains_creation_time);
2f77fc4b 1242 pthread_mutex_unlock(socket->lock);
f73fabfd 1243 if (ret != LTTNG_OK) {
2f77fc4b
DG
1244 goto error;
1245 }
6dc3064a
DG
1246 /* Session is now ready for network streaming. */
1247 session->net_handle = 1;
2f77fc4b 1248 }
b31610f2
JD
1249 session->consumer->relay_major_version =
1250 ksess->consumer->relay_major_version;
1251 session->consumer->relay_minor_version =
1252 ksess->consumer->relay_minor_version;
2f77fc4b
DG
1253 }
1254
1255error:
e7fe706f 1256 rcu_read_unlock();
2f77fc4b
DG
1257 return ret;
1258}
1259
9b6c7ec5
DG
1260/*
1261 * Start a kernel session by opening all necessary streams.
1262 */
7d268848 1263static int start_kernel_session(struct ltt_kernel_session *ksess)
9b6c7ec5
DG
1264{
1265 int ret;
1266 struct ltt_kernel_channel *kchan;
1267
1268 /* Open kernel metadata */
07b86b52 1269 if (ksess->metadata == NULL && ksess->output_traces) {
9b6c7ec5
DG
1270 ret = kernel_open_metadata(ksess);
1271 if (ret < 0) {
1272 ret = LTTNG_ERR_KERN_META_FAIL;
1273 goto error;
1274 }
1275 }
1276
1277 /* Open kernel metadata stream */
07b86b52 1278 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
9b6c7ec5
DG
1279 ret = kernel_open_metadata_stream(ksess);
1280 if (ret < 0) {
1281 ERR("Kernel create metadata stream failed");
1282 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1283 goto error;
1284 }
1285 }
1286
1287 /* For each channel */
1288 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
1289 if (kchan->stream_count == 0) {
1290 ret = kernel_open_channel_stream(kchan);
1291 if (ret < 0) {
1292 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1293 goto error;
1294 }
1295 /* Update the stream global counter */
1296 ksess->stream_count_global += ret;
1297 }
1298 }
1299
1300 /* Setup kernel consumer socket and send fds to it */
1301 ret = init_kernel_tracing(ksess);
e43c41c5 1302 if (ret != 0) {
9b6c7ec5
DG
1303 ret = LTTNG_ERR_KERN_START_FAIL;
1304 goto error;
1305 }
1306
1307 /* This start the kernel tracing */
1308 ret = kernel_start_session(ksess);
1309 if (ret < 0) {
1310 ret = LTTNG_ERR_KERN_START_FAIL;
1311 goto error;
1312 }
1313
1314 /* Quiescent wait after starting trace */
7d268848 1315 kernel_wait_quiescent();
9b6c7ec5 1316
14fb1ebe 1317 ksess->active = 1;
9b6c7ec5
DG
1318
1319 ret = LTTNG_OK;
1320
1321error:
1322 return ret;
1323}
1324
2f77fc4b
DG
1325/*
1326 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1327 */
56a37563
JG
1328int cmd_disable_channel(struct ltt_session *session,
1329 enum lttng_domain_type domain, char *channel_name)
2f77fc4b
DG
1330{
1331 int ret;
1332 struct ltt_ust_session *usess;
1333
1334 usess = session->ust_session;
1335
2223c96f
DG
1336 rcu_read_lock();
1337
2f77fc4b
DG
1338 switch (domain) {
1339 case LTTNG_DOMAIN_KERNEL:
1340 {
1341 ret = channel_kernel_disable(session->kernel_session,
1342 channel_name);
f73fabfd 1343 if (ret != LTTNG_OK) {
2f77fc4b
DG
1344 goto error;
1345 }
1346
7d268848 1347 kernel_wait_quiescent();
2f77fc4b
DG
1348 break;
1349 }
1350 case LTTNG_DOMAIN_UST:
1351 {
1352 struct ltt_ust_channel *uchan;
1353 struct lttng_ht *chan_ht;
1354
1355 chan_ht = usess->domain_global.channels;
1356
1357 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
1358 if (uchan == NULL) {
f73fabfd 1359 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
1360 goto error;
1361 }
1362
7972aab2 1363 ret = channel_ust_disable(usess, uchan);
f73fabfd 1364 if (ret != LTTNG_OK) {
2f77fc4b
DG
1365 goto error;
1366 }
1367 break;
1368 }
2f77fc4b 1369 default:
f73fabfd 1370 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1371 goto error;
1372 }
1373
f73fabfd 1374 ret = LTTNG_OK;
2f77fc4b
DG
1375
1376error:
2223c96f 1377 rcu_read_unlock();
2f77fc4b
DG
1378 return ret;
1379}
1380
ccf10263
MD
1381/*
1382 * Command LTTNG_TRACK_PID processed by the client thread.
a9ad0c8f
MD
1383 *
1384 * Called with session lock held.
ccf10263 1385 */
56a37563
JG
1386int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain,
1387 int pid)
ccf10263
MD
1388{
1389 int ret;
1390
1391 rcu_read_lock();
1392
1393 switch (domain) {
1394 case LTTNG_DOMAIN_KERNEL:
1395 {
1396 struct ltt_kernel_session *ksess;
1397
1398 ksess = session->kernel_session;
1399
1400 ret = kernel_track_pid(ksess, pid);
1401 if (ret != LTTNG_OK) {
1402 goto error;
1403 }
1404
7d268848 1405 kernel_wait_quiescent();
ccf10263
MD
1406 break;
1407 }
ccf10263 1408 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
1409 {
1410 struct ltt_ust_session *usess;
1411
1412 usess = session->ust_session;
1413
1414 ret = trace_ust_track_pid(usess, pid);
1415 if (ret != LTTNG_OK) {
1416 goto error;
1417 }
1418 break;
1419 }
ccf10263
MD
1420 default:
1421 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1422 goto error;
1423 }
1424
1425 ret = LTTNG_OK;
1426
1427error:
1428 rcu_read_unlock();
1429 return ret;
1430}
1431
1432/*
1433 * Command LTTNG_UNTRACK_PID processed by the client thread.
a9ad0c8f
MD
1434 *
1435 * Called with session lock held.
ccf10263 1436 */
56a37563
JG
1437int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain,
1438 int pid)
ccf10263
MD
1439{
1440 int ret;
1441
1442 rcu_read_lock();
1443
1444 switch (domain) {
1445 case LTTNG_DOMAIN_KERNEL:
1446 {
1447 struct ltt_kernel_session *ksess;
1448
1449 ksess = session->kernel_session;
1450
1451 ret = kernel_untrack_pid(ksess, pid);
1452 if (ret != LTTNG_OK) {
1453 goto error;
1454 }
1455
7d268848 1456 kernel_wait_quiescent();
ccf10263
MD
1457 break;
1458 }
ccf10263 1459 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
1460 {
1461 struct ltt_ust_session *usess;
1462
1463 usess = session->ust_session;
1464
1465 ret = trace_ust_untrack_pid(usess, pid);
1466 if (ret != LTTNG_OK) {
1467 goto error;
1468 }
1469 break;
1470 }
ccf10263
MD
1471 default:
1472 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1473 goto error;
1474 }
1475
1476 ret = LTTNG_OK;
1477
1478error:
1479 rcu_read_unlock();
1480 return ret;
1481}
1482
2f77fc4b
DG
1483/*
1484 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1485 *
1486 * The wpipe arguments is used as a notifier for the kernel thread.
1487 */
1488int cmd_enable_channel(struct ltt_session *session,
df4f5a87 1489 const struct lttng_domain *domain, const struct lttng_channel *_attr, int wpipe)
2f77fc4b
DG
1490{
1491 int ret;
1492 struct ltt_ust_session *usess = session->ust_session;
1493 struct lttng_ht *chan_ht;
1f345e94 1494 size_t len;
df4f5a87 1495 struct lttng_channel attr;
2f77fc4b
DG
1496
1497 assert(session);
df4f5a87 1498 assert(_attr);
7972aab2 1499 assert(domain);
2f77fc4b 1500
df4f5a87
JG
1501 attr = *_attr;
1502 len = lttng_strnlen(attr.name, sizeof(attr.name));
1f345e94
PP
1503
1504 /* Validate channel name */
df4f5a87
JG
1505 if (attr.name[0] == '.' ||
1506 memchr(attr.name, '/', len) != NULL) {
1f345e94
PP
1507 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1508 goto end;
1509 }
1510
df4f5a87 1511 DBG("Enabling channel %s for session %s", attr.name, session->name);
2f77fc4b 1512
03b4fdcf
DG
1513 rcu_read_lock();
1514
ecc48a90
JD
1515 /*
1516 * Don't try to enable a channel if the session has been started at
1517 * some point in time before. The tracer does not allow it.
1518 */
8382cf6f 1519 if (session->has_been_started) {
ecc48a90
JD
1520 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1521 goto error;
1522 }
1523
1524 /*
1525 * If the session is a live session, remove the switch timer, the
1526 * live timer does the same thing but sends also synchronisation
1527 * beacons for inactive streams.
1528 */
1529 if (session->live_timer > 0) {
df4f5a87
JG
1530 attr.attr.live_timer_interval = session->live_timer;
1531 attr.attr.switch_timer_interval = 0;
ecc48a90
JD
1532 }
1533
6e21424e
JR
1534 /* Check for feature support */
1535 switch (domain->type) {
1536 case LTTNG_DOMAIN_KERNEL:
1537 {
7d268848 1538 if (kernel_supports_ring_buffer_snapshot_sample_positions() != 1) {
6e21424e
JR
1539 /* Sampling position of buffer is not supported */
1540 WARN("Kernel tracer does not support buffer monitoring. "
1541 "Setting the monitor interval timer to 0 "
1542 "(disabled) for channel '%s' of session '%s'",
df4f5a87
JG
1543 attr.name, session->name);
1544 lttng_channel_set_monitor_timer_interval(&attr, 0);
6e21424e
JR
1545 }
1546 break;
1547 }
1548 case LTTNG_DOMAIN_UST:
f28f9e44 1549 break;
6e21424e
JR
1550 case LTTNG_DOMAIN_JUL:
1551 case LTTNG_DOMAIN_LOG4J:
1552 case LTTNG_DOMAIN_PYTHON:
f28f9e44
JG
1553 if (!agent_tracing_is_enabled()) {
1554 DBG("Attempted to enable a channel in an agent domain but the agent thread is not running");
1555 ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
1556 goto error;
1557 }
6e21424e
JR
1558 break;
1559 default:
1560 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1561 goto error;
1562 }
1563
7972aab2 1564 switch (domain->type) {
2f77fc4b
DG
1565 case LTTNG_DOMAIN_KERNEL:
1566 {
1567 struct ltt_kernel_channel *kchan;
1568
df4f5a87 1569 kchan = trace_kernel_get_channel_by_name(attr.name,
2f77fc4b
DG
1570 session->kernel_session);
1571 if (kchan == NULL) {
54213acc
JG
1572 if (session->snapshot.nb_output > 0 ||
1573 session->snapshot_mode) {
1574 /* Enforce mmap output for snapshot sessions. */
df4f5a87 1575 attr.attr.output = LTTNG_EVENT_MMAP;
54213acc 1576 }
df4f5a87
JG
1577 ret = channel_kernel_create(session->kernel_session, &attr, wpipe);
1578 if (attr.name[0] != '\0') {
85076754
MD
1579 session->kernel_session->has_non_default_channel = 1;
1580 }
2f77fc4b
DG
1581 } else {
1582 ret = channel_kernel_enable(session->kernel_session, kchan);
1583 }
1584
f73fabfd 1585 if (ret != LTTNG_OK) {
2f77fc4b
DG
1586 goto error;
1587 }
1588
7d268848 1589 kernel_wait_quiescent();
2f77fc4b
DG
1590 break;
1591 }
1592 case LTTNG_DOMAIN_UST:
9232818f
JG
1593 case LTTNG_DOMAIN_JUL:
1594 case LTTNG_DOMAIN_LOG4J:
1595 case LTTNG_DOMAIN_PYTHON:
2f77fc4b
DG
1596 {
1597 struct ltt_ust_channel *uchan;
1598
9232818f
JG
1599 /*
1600 * FIXME
1601 *
1602 * Current agent implementation limitations force us to allow
1603 * only one channel at once in "agent" subdomains. Each
1604 * subdomain has a default channel name which must be strictly
1605 * adhered to.
1606 */
1607 if (domain->type == LTTNG_DOMAIN_JUL) {
df4f5a87 1608 if (strncmp(attr.name, DEFAULT_JUL_CHANNEL_NAME,
9232818f
JG
1609 LTTNG_SYMBOL_NAME_LEN)) {
1610 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1611 goto error;
1612 }
1613 } else if (domain->type == LTTNG_DOMAIN_LOG4J) {
df4f5a87 1614 if (strncmp(attr.name, DEFAULT_LOG4J_CHANNEL_NAME,
9232818f
JG
1615 LTTNG_SYMBOL_NAME_LEN)) {
1616 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1617 goto error;
1618 }
1619 } else if (domain->type == LTTNG_DOMAIN_PYTHON) {
df4f5a87 1620 if (strncmp(attr.name, DEFAULT_PYTHON_CHANNEL_NAME,
9232818f
JG
1621 LTTNG_SYMBOL_NAME_LEN)) {
1622 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1623 goto error;
1624 }
1625 }
1626
2f77fc4b
DG
1627 chan_ht = usess->domain_global.channels;
1628
df4f5a87 1629 uchan = trace_ust_find_channel_by_name(chan_ht, attr.name);
2f77fc4b 1630 if (uchan == NULL) {
df4f5a87
JG
1631 ret = channel_ust_create(usess, &attr, domain->buf_type);
1632 if (attr.name[0] != '\0') {
85076754
MD
1633 usess->has_non_default_channel = 1;
1634 }
2f77fc4b 1635 } else {
7972aab2 1636 ret = channel_ust_enable(usess, uchan);
2f77fc4b
DG
1637 }
1638 break;
1639 }
2f77fc4b 1640 default:
f73fabfd 1641 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1642 goto error;
1643 }
1644
df4f5a87 1645 if (ret == LTTNG_OK && attr.attr.output != LTTNG_EVENT_MMAP) {
54213acc
JG
1646 session->has_non_mmap_channel = true;
1647 }
2f77fc4b 1648error:
2223c96f 1649 rcu_read_unlock();
1f345e94 1650end:
2f77fc4b
DG
1651 return ret;
1652}
1653
2f77fc4b
DG
1654/*
1655 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1656 */
56a37563 1657int cmd_disable_event(struct ltt_session *session,
df4f5a87
JG
1658 enum lttng_domain_type domain, const char *channel_name,
1659 const struct lttng_event *event)
2f77fc4b
DG
1660{
1661 int ret;
df4f5a87 1662 const char *event_name;
6e911cad 1663
18a720cd
MD
1664 DBG("Disable event command for event \'%s\'", event->name);
1665
6e911cad
MD
1666 event_name = event->name;
1667
9b7431cf
JG
1668 /* Error out on unhandled search criteria */
1669 if (event->loglevel_type || event->loglevel != -1 || event->enabled
6e911cad 1670 || event->pid || event->filter || event->exclusion) {
7076b56e
JG
1671 ret = LTTNG_ERR_UNK;
1672 goto error;
6e911cad 1673 }
2f77fc4b 1674
2223c96f
DG
1675 rcu_read_lock();
1676
2f77fc4b
DG
1677 switch (domain) {
1678 case LTTNG_DOMAIN_KERNEL:
1679 {
1680 struct ltt_kernel_channel *kchan;
1681 struct ltt_kernel_session *ksess;
1682
1683 ksess = session->kernel_session;
1684
85076754
MD
1685 /*
1686 * If a non-default channel has been created in the
1687 * session, explicitely require that -c chan_name needs
1688 * to be provided.
1689 */
1690 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1691 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1692 goto error_unlock;
85076754
MD
1693 }
1694
2f77fc4b
DG
1695 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1696 if (kchan == NULL) {
f73fabfd 1697 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
7076b56e 1698 goto error_unlock;
2f77fc4b
DG
1699 }
1700
6e911cad
MD
1701 switch (event->type) {
1702 case LTTNG_EVENT_ALL:
9550ee81 1703 case LTTNG_EVENT_TRACEPOINT:
d0ae4ea8 1704 case LTTNG_EVENT_SYSCALL:
9550ee81
JR
1705 case LTTNG_EVENT_PROBE:
1706 case LTTNG_EVENT_FUNCTION:
1707 case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */
1708 if (event_name[0] == '\0') {
1709 ret = event_kernel_disable_event(kchan,
1710 NULL, event->type);
29c62722 1711 } else {
d0ae4ea8 1712 ret = event_kernel_disable_event(kchan,
9550ee81 1713 event_name, event->type);
29c62722 1714 }
6e911cad 1715 if (ret != LTTNG_OK) {
7076b56e 1716 goto error_unlock;
6e911cad
MD
1717 }
1718 break;
6e911cad
MD
1719 default:
1720 ret = LTTNG_ERR_UNK;
7076b56e 1721 goto error_unlock;
2f77fc4b
DG
1722 }
1723
7d268848 1724 kernel_wait_quiescent();
2f77fc4b
DG
1725 break;
1726 }
1727 case LTTNG_DOMAIN_UST:
1728 {
1729 struct ltt_ust_channel *uchan;
1730 struct ltt_ust_session *usess;
1731
1732 usess = session->ust_session;
1733
7076b56e
JG
1734 if (validate_ust_event_name(event_name)) {
1735 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1736 goto error_unlock;
1737 }
1738
85076754
MD
1739 /*
1740 * If a non-default channel has been created in the
9550ee81 1741 * session, explicitly require that -c chan_name needs
85076754
MD
1742 * to be provided.
1743 */
1744 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1745 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1746 goto error_unlock;
85076754
MD
1747 }
1748
2f77fc4b
DG
1749 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1750 channel_name);
1751 if (uchan == NULL) {
f73fabfd 1752 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
7076b56e 1753 goto error_unlock;
2f77fc4b
DG
1754 }
1755
6e911cad
MD
1756 switch (event->type) {
1757 case LTTNG_EVENT_ALL:
b3639870
JR
1758 /*
1759 * An empty event name means that everything
1760 * should be disabled.
1761 */
1762 if (event->name[0] == '\0') {
1763 ret = event_ust_disable_all_tracepoints(usess, uchan);
77d536b2
JR
1764 } else {
1765 ret = event_ust_disable_tracepoint(usess, uchan,
1766 event_name);
1767 }
6e911cad 1768 if (ret != LTTNG_OK) {
7076b56e 1769 goto error_unlock;
6e911cad
MD
1770 }
1771 break;
1772 default:
1773 ret = LTTNG_ERR_UNK;
7076b56e 1774 goto error_unlock;
2f77fc4b
DG
1775 }
1776
1777 DBG3("Disable UST event %s in channel %s completed", event_name,
1778 channel_name);
1779 break;
1780 }
5cdb6027 1781 case LTTNG_DOMAIN_LOG4J:
f20baf8e 1782 case LTTNG_DOMAIN_JUL:
0e115563 1783 case LTTNG_DOMAIN_PYTHON:
f20baf8e 1784 {
fefd409b 1785 struct agent *agt;
f20baf8e
DG
1786 struct ltt_ust_session *usess = session->ust_session;
1787
1788 assert(usess);
1789
6e911cad
MD
1790 switch (event->type) {
1791 case LTTNG_EVENT_ALL:
1792 break;
1793 default:
1794 ret = LTTNG_ERR_UNK;
7076b56e 1795 goto error_unlock;
6e911cad
MD
1796 }
1797
5cdb6027 1798 agt = trace_ust_find_agent(usess, domain);
fefd409b
DG
1799 if (!agt) {
1800 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
7076b56e 1801 goto error_unlock;
fefd409b 1802 }
b3639870
JR
1803 /*
1804 * An empty event name means that everything
1805 * should be disabled.
1806 */
1807 if (event->name[0] == '\0') {
18a720cd
MD
1808 ret = event_agent_disable_all(usess, agt);
1809 } else {
1810 ret = event_agent_disable(usess, agt, event_name);
1811 }
f20baf8e 1812 if (ret != LTTNG_OK) {
7076b56e 1813 goto error_unlock;
f20baf8e
DG
1814 }
1815
1816 break;
1817 }
2f77fc4b 1818 default:
f73fabfd 1819 ret = LTTNG_ERR_UND;
7076b56e 1820 goto error_unlock;
2f77fc4b
DG
1821 }
1822
f73fabfd 1823 ret = LTTNG_OK;
2f77fc4b 1824
7076b56e 1825error_unlock:
2223c96f 1826 rcu_read_unlock();
7076b56e 1827error:
2f77fc4b
DG
1828 return ret;
1829}
1830
2f77fc4b
DG
1831/*
1832 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1833 */
56a37563 1834int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain,
df4f5a87 1835 char *channel_name, const struct lttng_event_context *ctx, int kwpipe)
2f77fc4b 1836{
d5979e4a 1837 int ret, chan_kern_created = 0, chan_ust_created = 0;
bdf64013
JG
1838 char *app_ctx_provider_name = NULL, *app_ctx_name = NULL;
1839
9a699f7b
JR
1840 /*
1841 * Don't try to add a context if the session has been started at
1842 * some point in time before. The tracer does not allow it and would
1843 * result in a corrupted trace.
1844 */
1845 if (session->has_been_started) {
1846 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1847 goto end;
1848 }
1849
bdf64013
JG
1850 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
1851 app_ctx_provider_name = ctx->u.app_ctx.provider_name;
1852 app_ctx_name = ctx->u.app_ctx.ctx_name;
1853 }
2f77fc4b
DG
1854
1855 switch (domain) {
1856 case LTTNG_DOMAIN_KERNEL:
979e618e
DG
1857 assert(session->kernel_session);
1858
1859 if (session->kernel_session->channel_count == 0) {
1860 /* Create default channel */
1861 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1862 if (ret != LTTNG_OK) {
1863 goto error;
1864 }
d5979e4a 1865 chan_kern_created = 1;
979e618e 1866 }
2f77fc4b 1867 /* Add kernel context to kernel tracer */
601d5acf 1868 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
f73fabfd 1869 if (ret != LTTNG_OK) {
2f77fc4b
DG
1870 goto error;
1871 }
1872 break;
bdf64013
JG
1873 case LTTNG_DOMAIN_JUL:
1874 case LTTNG_DOMAIN_LOG4J:
1875 {
1876 /*
1877 * Validate channel name.
1878 * If no channel name is given and the domain is JUL or LOG4J,
1879 * set it to the appropriate domain-specific channel name. If
1880 * a name is provided but does not match the expexted channel
1881 * name, return an error.
1882 */
1883 if (domain == LTTNG_DOMAIN_JUL && *channel_name &&
1884 strcmp(channel_name,
1885 DEFAULT_JUL_CHANNEL_NAME)) {
1886 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1887 goto error;
1888 } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name &&
1889 strcmp(channel_name,
1890 DEFAULT_LOG4J_CHANNEL_NAME)) {
1891 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1892 goto error;
1893 }
a93b3916 1894 /* break is _not_ missing here. */
bdf64013 1895 }
2f77fc4b
DG
1896 case LTTNG_DOMAIN_UST:
1897 {
1898 struct ltt_ust_session *usess = session->ust_session;
85076754
MD
1899 unsigned int chan_count;
1900
2f77fc4b
DG
1901 assert(usess);
1902
85076754 1903 chan_count = lttng_ht_get_count(usess->domain_global.channels);
979e618e
DG
1904 if (chan_count == 0) {
1905 struct lttng_channel *attr;
1906 /* Create default channel */
0a9c6494 1907 attr = channel_new_default_attr(domain, usess->buffer_type);
979e618e
DG
1908 if (attr == NULL) {
1909 ret = LTTNG_ERR_FATAL;
1910 goto error;
1911 }
1912
7972aab2 1913 ret = channel_ust_create(usess, attr, usess->buffer_type);
979e618e
DG
1914 if (ret != LTTNG_OK) {
1915 free(attr);
1916 goto error;
1917 }
cf0bcb51 1918 channel_attr_destroy(attr);
d5979e4a 1919 chan_ust_created = 1;
979e618e
DG
1920 }
1921
601d5acf 1922 ret = context_ust_add(usess, domain, ctx, channel_name);
bdf64013
JG
1923 free(app_ctx_provider_name);
1924 free(app_ctx_name);
1925 app_ctx_name = NULL;
1926 app_ctx_provider_name = NULL;
f73fabfd 1927 if (ret != LTTNG_OK) {
2f77fc4b
DG
1928 goto error;
1929 }
1930 break;
1931 }
2f77fc4b 1932 default:
f73fabfd 1933 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1934 goto error;
1935 }
1936
bdf64013
JG
1937 ret = LTTNG_OK;
1938 goto end;
2f77fc4b
DG
1939
1940error:
d5979e4a
DG
1941 if (chan_kern_created) {
1942 struct ltt_kernel_channel *kchan =
1943 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1944 session->kernel_session);
1945 /* Created previously, this should NOT fail. */
1946 assert(kchan);
1947 kernel_destroy_channel(kchan);
1948 }
1949
1950 if (chan_ust_created) {
1951 struct ltt_ust_channel *uchan =
1952 trace_ust_find_channel_by_name(
1953 session->ust_session->domain_global.channels,
1954 DEFAULT_CHANNEL_NAME);
1955 /* Created previously, this should NOT fail. */
1956 assert(uchan);
1957 /* Remove from the channel list of the session. */
1958 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1959 uchan);
1960 trace_ust_destroy_channel(uchan);
1961 }
bdf64013
JG
1962end:
1963 free(app_ctx_provider_name);
1964 free(app_ctx_name);
2f77fc4b
DG
1965 return ret;
1966}
1967
dac8e046
JG
1968static inline bool name_starts_with(const char *name, const char *prefix)
1969{
1970 const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
1971
1972 return !strncmp(name, prefix, max_cmp_len);
1973}
1974
1975/* Perform userspace-specific event name validation */
1976static int validate_ust_event_name(const char *name)
1977{
1978 int ret = 0;
1979
1980 if (!name) {
1981 ret = -1;
1982 goto end;
1983 }
1984
1985 /*
1986 * Check name against all internal UST event component namespaces used
1987 * by the agents.
1988 */
1989 if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) ||
1990 name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) ||
1991 name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) {
1992 ret = -1;
1993 }
1994
1995end:
1996 return ret;
1997}
88f06f15 1998
2f77fc4b 1999/*
88f06f15
JG
2000 * Internal version of cmd_enable_event() with a supplemental
2001 * "internal_event" flag which is used to enable internal events which should
2002 * be hidden from clients. Such events are used in the agent implementation to
2003 * enable the events through which all "agent" events are funeled.
2f77fc4b 2004 */
88f06f15 2005static int _cmd_enable_event(struct ltt_session *session,
df4f5a87 2006 const struct lttng_domain *domain,
025faf73 2007 char *channel_name, struct lttng_event *event,
6b453b5e 2008 char *filter_expression,
db8f1377
JI
2009 struct lttng_filter_bytecode *filter,
2010 struct lttng_event_exclusion *exclusion,
88f06f15 2011 int wpipe, bool internal_event)
2f77fc4b 2012{
9f449915 2013 int ret = 0, channel_created = 0;
cfedea03 2014 struct lttng_channel *attr = NULL;
2f77fc4b
DG
2015
2016 assert(session);
2017 assert(event);
2018 assert(channel_name);
2019
2a385866
JG
2020 /* If we have a filter, we must have its filter expression */
2021 assert(!(!!filter_expression ^ !!filter));
2022
9f449915
PP
2023 /* Normalize event name as a globbing pattern */
2024 strutils_normalize_star_glob_pattern(event->name);
18a720cd 2025
9f449915
PP
2026 /* Normalize exclusion names as globbing patterns */
2027 if (exclusion) {
2028 size_t i;
f5ac4bd7 2029
9f449915
PP
2030 for (i = 0; i < exclusion->count; i++) {
2031 char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i);
2032
2033 strutils_normalize_star_glob_pattern(name);
2034 }
930a2e99
JG
2035 }
2036
9f449915
PP
2037 DBG("Enable event command for event \'%s\'", event->name);
2038
2039 rcu_read_lock();
2040
7972aab2 2041 switch (domain->type) {
2f77fc4b
DG
2042 case LTTNG_DOMAIN_KERNEL:
2043 {
2044 struct ltt_kernel_channel *kchan;
2045
85076754
MD
2046 /*
2047 * If a non-default channel has been created in the
2048 * session, explicitely require that -c chan_name needs
2049 * to be provided.
2050 */
2051 if (session->kernel_session->has_non_default_channel
2052 && channel_name[0] == '\0') {
2053 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
2054 goto error;
2055 }
2056
2f77fc4b
DG
2057 kchan = trace_kernel_get_channel_by_name(channel_name,
2058 session->kernel_session);
2059 if (kchan == NULL) {
0a9c6494
DG
2060 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
2061 LTTNG_BUFFER_GLOBAL);
2f77fc4b 2062 if (attr == NULL) {
f73fabfd 2063 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2064 goto error;
2065 }
04c17253
MD
2066 if (lttng_strncpy(attr->name, channel_name,
2067 sizeof(attr->name))) {
2068 ret = LTTNG_ERR_INVALID;
04c17253
MD
2069 goto error;
2070 }
2f77fc4b
DG
2071
2072 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 2073 if (ret != LTTNG_OK) {
2f77fc4b
DG
2074 goto error;
2075 }
e5f5db7f 2076 channel_created = 1;
2f77fc4b
DG
2077 }
2078
2079 /* Get the newly created kernel channel pointer */
2080 kchan = trace_kernel_get_channel_by_name(channel_name,
2081 session->kernel_session);
2082 if (kchan == NULL) {
2083 /* This sould not happen... */
f73fabfd 2084 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2085 goto error;
2086 }
2087
6e911cad
MD
2088 switch (event->type) {
2089 case LTTNG_EVENT_ALL:
29c62722 2090 {
00a62084
MD
2091 char *filter_expression_a = NULL;
2092 struct lttng_filter_bytecode *filter_a = NULL;
2093
2094 /*
2095 * We need to duplicate filter_expression and filter,
2096 * because ownership is passed to first enable
2097 * event.
2098 */
2099 if (filter_expression) {
2100 filter_expression_a = strdup(filter_expression);
2101 if (!filter_expression_a) {
2102 ret = LTTNG_ERR_FATAL;
2103 goto error;
2104 }
2105 }
2106 if (filter) {
2107 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
2108 if (!filter_a) {
2109 free(filter_expression_a);
2110 ret = LTTNG_ERR_FATAL;
2111 goto error;
2112 }
2113 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
2114 }
29c62722 2115 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
00a62084
MD
2116 ret = event_kernel_enable_event(kchan, event,
2117 filter_expression, filter);
a969e101
MD
2118 /* We have passed ownership */
2119 filter_expression = NULL;
2120 filter = NULL;
29c62722
MD
2121 if (ret != LTTNG_OK) {
2122 if (channel_created) {
2123 /* Let's not leak a useless channel. */
2124 kernel_destroy_channel(kchan);
2125 }
00a62084
MD
2126 free(filter_expression_a);
2127 free(filter_a);
29c62722
MD
2128 goto error;
2129 }
2130 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
00a62084
MD
2131 ret = event_kernel_enable_event(kchan, event,
2132 filter_expression_a, filter_a);
60d21fa2
AB
2133 /* We have passed ownership */
2134 filter_expression_a = NULL;
2135 filter_a = NULL;
29c62722
MD
2136 if (ret != LTTNG_OK) {
2137 goto error;
2138 }
2139 break;
2140 }
6e6ef3d7 2141 case LTTNG_EVENT_PROBE:
dcabc190 2142 case LTTNG_EVENT_USERSPACE_PROBE:
6e6ef3d7
DG
2143 case LTTNG_EVENT_FUNCTION:
2144 case LTTNG_EVENT_FUNCTION_ENTRY:
6e911cad 2145 case LTTNG_EVENT_TRACEPOINT:
00a62084
MD
2146 ret = event_kernel_enable_event(kchan, event,
2147 filter_expression, filter);
a969e101
MD
2148 /* We have passed ownership */
2149 filter_expression = NULL;
2150 filter = NULL;
6e911cad
MD
2151 if (ret != LTTNG_OK) {
2152 if (channel_created) {
2153 /* Let's not leak a useless channel. */
2154 kernel_destroy_channel(kchan);
2155 }
2156 goto error;
e5f5db7f 2157 }
6e911cad
MD
2158 break;
2159 case LTTNG_EVENT_SYSCALL:
00a62084
MD
2160 ret = event_kernel_enable_event(kchan, event,
2161 filter_expression, filter);
a969e101
MD
2162 /* We have passed ownership */
2163 filter_expression = NULL;
2164 filter = NULL;
e2b957af
MD
2165 if (ret != LTTNG_OK) {
2166 goto error;
2167 }
6e911cad
MD
2168 break;
2169 default:
2170 ret = LTTNG_ERR_UNK;
2f77fc4b
DG
2171 goto error;
2172 }
2173
7d268848 2174 kernel_wait_quiescent();
2f77fc4b
DG
2175 break;
2176 }
2177 case LTTNG_DOMAIN_UST:
2178 {
2179 struct ltt_ust_channel *uchan;
2180 struct ltt_ust_session *usess = session->ust_session;
2181
2182 assert(usess);
2183
85076754
MD
2184 /*
2185 * If a non-default channel has been created in the
2186 * session, explicitely require that -c chan_name needs
2187 * to be provided.
2188 */
2189 if (usess->has_non_default_channel && channel_name[0] == '\0') {
2190 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
2191 goto error;
2192 }
2193
2f77fc4b
DG
2194 /* Get channel from global UST domain */
2195 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2196 channel_name);
2197 if (uchan == NULL) {
2198 /* Create default channel */
0a9c6494
DG
2199 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
2200 usess->buffer_type);
2f77fc4b 2201 if (attr == NULL) {
f73fabfd 2202 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2203 goto error;
2204 }
04c17253
MD
2205 if (lttng_strncpy(attr->name, channel_name,
2206 sizeof(attr->name))) {
2207 ret = LTTNG_ERR_INVALID;
04c17253
MD
2208 goto error;
2209 }
2f77fc4b
DG
2210
2211 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 2212 if (ret != LTTNG_OK) {
2f77fc4b
DG
2213 goto error;
2214 }
2f77fc4b
DG
2215
2216 /* Get the newly created channel reference back */
2217 uchan = trace_ust_find_channel_by_name(
2218 usess->domain_global.channels, channel_name);
2219 assert(uchan);
2220 }
2221
141feb8c
JG
2222 if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) {
2223 /*
2224 * Don't allow users to add UST events to channels which
2225 * are assigned to a userspace subdomain (JUL, Log4J,
2226 * Python, etc.).
2227 */
2228 ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN;
2229 goto error;
2230 }
2231
dac8e046
JG
2232 if (!internal_event) {
2233 /*
2234 * Ensure the event name is not reserved for internal
2235 * use.
2236 */
2237 ret = validate_ust_event_name(event->name);
2238 if (ret) {
2239 WARN("Userspace event name %s failed validation.",
bbcab087 2240 event->name);
dac8e046
JG
2241 ret = LTTNG_ERR_INVALID_EVENT_NAME;
2242 goto error;
2243 }
2244 }
2245
2f77fc4b 2246 /* At this point, the session and channel exist on the tracer */
6b453b5e 2247 ret = event_ust_enable_tracepoint(usess, uchan, event,
88f06f15
JG
2248 filter_expression, filter, exclusion,
2249 internal_event);
49d21f93
MD
2250 /* We have passed ownership */
2251 filter_expression = NULL;
2252 filter = NULL;
2253 exclusion = NULL;
94382e15
JG
2254 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2255 goto already_enabled;
2256 } else if (ret != LTTNG_OK) {
2f77fc4b
DG
2257 goto error;
2258 }
2259 break;
2260 }
5cdb6027 2261 case LTTNG_DOMAIN_LOG4J:
f20baf8e 2262 case LTTNG_DOMAIN_JUL:
0e115563 2263 case LTTNG_DOMAIN_PYTHON:
f20baf8e 2264 {
da6c3a50 2265 const char *default_event_name, *default_chan_name;
fefd409b 2266 struct agent *agt;
f20baf8e
DG
2267 struct lttng_event uevent;
2268 struct lttng_domain tmp_dom;
2269 struct ltt_ust_session *usess = session->ust_session;
2270
2271 assert(usess);
2272
f28f9e44
JG
2273 if (!agent_tracing_is_enabled()) {
2274 DBG("Attempted to enable an event in an agent domain but the agent thread is not running");
2275 ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
2276 goto error;
2277 }
2278
5cdb6027 2279 agt = trace_ust_find_agent(usess, domain->type);
fefd409b 2280 if (!agt) {
5cdb6027 2281 agt = agent_create(domain->type);
fefd409b 2282 if (!agt) {
e5b3c48c 2283 ret = LTTNG_ERR_NOMEM;
fefd409b
DG
2284 goto error;
2285 }
2286 agent_add(agt, usess->agents);
2287 }
2288
022d91ba 2289 /* Create the default tracepoint. */
996de3c7 2290 memset(&uevent, 0, sizeof(uevent));
f20baf8e
DG
2291 uevent.type = LTTNG_EVENT_TRACEPOINT;
2292 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
51755dc8
JG
2293 default_event_name = event_get_default_agent_ust_name(
2294 domain->type);
da6c3a50 2295 if (!default_event_name) {
e5b3c48c 2296 ret = LTTNG_ERR_FATAL;
da6c3a50 2297 goto error;
f43f95a9 2298 }
da6c3a50 2299 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
f20baf8e
DG
2300 uevent.name[sizeof(uevent.name) - 1] = '\0';
2301
2302 /*
2303 * The domain type is changed because we are about to enable the
2304 * default channel and event for the JUL domain that are hardcoded.
2305 * This happens in the UST domain.
2306 */
2307 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
2308 tmp_dom.type = LTTNG_DOMAIN_UST;
2309
0e115563
DG
2310 switch (domain->type) {
2311 case LTTNG_DOMAIN_LOG4J:
da6c3a50 2312 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
0e115563
DG
2313 break;
2314 case LTTNG_DOMAIN_JUL:
da6c3a50 2315 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
0e115563
DG
2316 break;
2317 case LTTNG_DOMAIN_PYTHON:
2318 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
2319 break;
2320 default:
e98a44b0 2321 /* The switch/case we are in makes this impossible */
0e115563 2322 assert(0);
da6c3a50
DG
2323 }
2324
971da06a 2325 {
8404118c 2326 char *filter_expression_copy = NULL;
51755dc8 2327 struct lttng_filter_bytecode *filter_copy = NULL;
971da06a
JG
2328
2329 if (filter) {
51755dc8
JG
2330 const size_t filter_size = sizeof(
2331 struct lttng_filter_bytecode)
2332 + filter->len;
2333
2334 filter_copy = zmalloc(filter_size);
971da06a 2335 if (!filter_copy) {
018096a4 2336 ret = LTTNG_ERR_NOMEM;
b742e3e2 2337 goto error;
971da06a 2338 }
51755dc8 2339 memcpy(filter_copy, filter, filter_size);
971da06a 2340
8404118c
JG
2341 filter_expression_copy =
2342 strdup(filter_expression);
2343 if (!filter_expression) {
2344 ret = LTTNG_ERR_NOMEM;
51755dc8
JG
2345 }
2346
2347 if (!filter_expression_copy || !filter_copy) {
2348 free(filter_expression_copy);
2349 free(filter_copy);
2350 goto error;
8404118c 2351 }
971da06a
JG
2352 }
2353
88f06f15 2354 ret = cmd_enable_event_internal(session, &tmp_dom,
971da06a 2355 (char *) default_chan_name,
8404118c
JG
2356 &uevent, filter_expression_copy,
2357 filter_copy, NULL, wpipe);
971da06a
JG
2358 }
2359
94382e15
JG
2360 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2361 goto already_enabled;
2362 } else if (ret != LTTNG_OK) {
f20baf8e
DG
2363 goto error;
2364 }
2365
2366 /* The wild card * means that everything should be enabled. */
2367 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
8404118c
JG
2368 ret = event_agent_enable_all(usess, agt, event, filter,
2369 filter_expression);
f20baf8e 2370 } else {
8404118c
JG
2371 ret = event_agent_enable(usess, agt, event, filter,
2372 filter_expression);
f20baf8e 2373 }
51755dc8
JG
2374 filter = NULL;
2375 filter_expression = NULL;
f20baf8e
DG
2376 if (ret != LTTNG_OK) {
2377 goto error;
2378 }
2379
2380 break;
2381 }
2f77fc4b 2382 default:
f73fabfd 2383 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2384 goto error;
2385 }
2386
f73fabfd 2387 ret = LTTNG_OK;
2f77fc4b 2388
94382e15 2389already_enabled:
2f77fc4b 2390error:
49d21f93
MD
2391 free(filter_expression);
2392 free(filter);
2393 free(exclusion);
cf0bcb51 2394 channel_attr_destroy(attr);
2223c96f 2395 rcu_read_unlock();
2f77fc4b
DG
2396 return ret;
2397}
2398
88f06f15
JG
2399/*
2400 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2401 * We own filter, exclusion, and filter_expression.
2402 */
df4f5a87
JG
2403int cmd_enable_event(struct ltt_session *session,
2404 const struct lttng_domain *domain,
88f06f15
JG
2405 char *channel_name, struct lttng_event *event,
2406 char *filter_expression,
2407 struct lttng_filter_bytecode *filter,
2408 struct lttng_event_exclusion *exclusion,
2409 int wpipe)
2410{
2411 return _cmd_enable_event(session, domain, channel_name, event,
2412 filter_expression, filter, exclusion, wpipe, false);
2413}
2414
2415/*
2416 * Enable an event which is internal to LTTng. An internal should
2417 * never be made visible to clients and are immune to checks such as
2418 * reserved names.
2419 */
2420static int cmd_enable_event_internal(struct ltt_session *session,
df4f5a87 2421 const struct lttng_domain *domain,
88f06f15
JG
2422 char *channel_name, struct lttng_event *event,
2423 char *filter_expression,
2424 struct lttng_filter_bytecode *filter,
2425 struct lttng_event_exclusion *exclusion,
2426 int wpipe)
2427{
2428 return _cmd_enable_event(session, domain, channel_name, event,
2429 filter_expression, filter, exclusion, wpipe, true);
2430}
2431
2f77fc4b
DG
2432/*
2433 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2434 */
56a37563
JG
2435ssize_t cmd_list_tracepoints(enum lttng_domain_type domain,
2436 struct lttng_event **events)
2f77fc4b
DG
2437{
2438 int ret;
2439 ssize_t nb_events = 0;
2440
2441 switch (domain) {
2442 case LTTNG_DOMAIN_KERNEL:
7d268848 2443 nb_events = kernel_list_events(events);
2f77fc4b 2444 if (nb_events < 0) {
f73fabfd 2445 ret = LTTNG_ERR_KERN_LIST_FAIL;
2f77fc4b
DG
2446 goto error;
2447 }
2448 break;
2449 case LTTNG_DOMAIN_UST:
2450 nb_events = ust_app_list_events(events);
2451 if (nb_events < 0) {
f73fabfd 2452 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
2453 goto error;
2454 }
2455 break;
5cdb6027 2456 case LTTNG_DOMAIN_LOG4J:
3c6a091f 2457 case LTTNG_DOMAIN_JUL:
0e115563 2458 case LTTNG_DOMAIN_PYTHON:
f60140a1 2459 nb_events = agent_list_events(events, domain);
3c6a091f
DG
2460 if (nb_events < 0) {
2461 ret = LTTNG_ERR_UST_LIST_FAIL;
2462 goto error;
2463 }
2464 break;
2f77fc4b 2465 default:
f73fabfd 2466 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2467 goto error;
2468 }
2469
2470 return nb_events;
2471
2472error:
2473 /* Return negative value to differentiate return code */
2474 return -ret;
2475}
2476
2477/*
2478 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2479 */
56a37563 2480ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain,
2f77fc4b
DG
2481 struct lttng_event_field **fields)
2482{
2483 int ret;
2484 ssize_t nb_fields = 0;
2485
2486 switch (domain) {
2487 case LTTNG_DOMAIN_UST:
2488 nb_fields = ust_app_list_event_fields(fields);
2489 if (nb_fields < 0) {
f73fabfd 2490 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
2491 goto error;
2492 }
2493 break;
2494 case LTTNG_DOMAIN_KERNEL:
2495 default: /* fall-through */
f73fabfd 2496 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2497 goto error;
2498 }
2499
2500 return nb_fields;
2501
2502error:
2503 /* Return negative value to differentiate return code */
2504 return -ret;
2505}
2506
834978fd
DG
2507ssize_t cmd_list_syscalls(struct lttng_event **events)
2508{
2509 return syscall_table_list(events);
2510}
2511
a5dfbb9d
MD
2512/*
2513 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2514 *
2515 * Called with session lock held.
2516 */
2517ssize_t cmd_list_tracker_pids(struct ltt_session *session,
56a37563 2518 enum lttng_domain_type domain, int32_t **pids)
a5dfbb9d
MD
2519{
2520 int ret;
2521 ssize_t nr_pids = 0;
2522
2523 switch (domain) {
2524 case LTTNG_DOMAIN_KERNEL:
2525 {
2526 struct ltt_kernel_session *ksess;
2527
2528 ksess = session->kernel_session;
2529 nr_pids = kernel_list_tracker_pids(ksess, pids);
2530 if (nr_pids < 0) {
2531 ret = LTTNG_ERR_KERN_LIST_FAIL;
2532 goto error;
2533 }
2534 break;
2535 }
2536 case LTTNG_DOMAIN_UST:
2537 {
2538 struct ltt_ust_session *usess;
2539
2540 usess = session->ust_session;
2541 nr_pids = trace_ust_list_tracker_pids(usess, pids);
2542 if (nr_pids < 0) {
2543 ret = LTTNG_ERR_UST_LIST_FAIL;
2544 goto error;
2545 }
2546 break;
2547 }
2548 case LTTNG_DOMAIN_LOG4J:
2549 case LTTNG_DOMAIN_JUL:
2550 case LTTNG_DOMAIN_PYTHON:
2551 default:
2552 ret = LTTNG_ERR_UND;
2553 goto error;
2554 }
2555
2556 return nr_pids;
2557
2558error:
2559 /* Return negative value to differentiate return code */
2560 return -ret;
2561}
2562
2f77fc4b
DG
2563/*
2564 * Command LTTNG_START_TRACE processed by the client thread.
a9ad0c8f
MD
2565 *
2566 * Called with session mutex held.
2f77fc4b
DG
2567 */
2568int cmd_start_trace(struct ltt_session *session)
2569{
82b69413 2570 enum lttng_error_code ret;
cde3e505 2571 unsigned long nb_chan = 0;
2f77fc4b
DG
2572 struct ltt_kernel_session *ksession;
2573 struct ltt_ust_session *usess;
1f496244
JG
2574 const bool session_rotated_after_last_stop =
2575 session->rotated_after_last_stop;
2f77fc4b
DG
2576
2577 assert(session);
2578
2579 /* Ease our life a bit ;) */
2580 ksession = session->kernel_session;
2581 usess = session->ust_session;
2582
8382cf6f
DG
2583 /* Is the session already started? */
2584 if (session->active) {
f73fabfd 2585 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2586 goto error;
2587 }
2588
1f496244
JG
2589 if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING &&
2590 !session->current_trace_chunk) {
2591 /*
2592 * A rotation was launched while the session was stopped and
2593 * it has not been completed yet. It is not possible to start
2594 * the session since starting the session here would require a
2595 * rotation from "NULL" to a new trace chunk. That rotation
2596 * would overlap with the ongoing rotation, which is not
2597 * supported.
2598 */
2599 WARN("Refusing to start session \"%s\" as a rotation launched after the last \"stop\" is still ongoing",
2600 session->name);
2601 ret = LTTNG_ERR_ROTATION_PENDING;
2602 goto error;
2603 }
2604
cde3e505
DG
2605 /*
2606 * Starting a session without channel is useless since after that it's not
2607 * possible to enable channel thus inform the client.
2608 */
2609 if (usess && usess->domain_global.channels) {
2610 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
2611 }
2612 if (ksession) {
2613 nb_chan += ksession->channel_count;
2614 }
2615 if (!nb_chan) {
2616 ret = LTTNG_ERR_NO_CHANNEL;
2617 goto error;
2618 }
2619
1f496244
JG
2620 session->active = 1;
2621 session->rotated_after_last_stop = false;
070b6a86 2622 if (session->output_traces && !session->current_trace_chunk) {
1f496244
JG
2623 if (!session->has_been_started) {
2624 struct lttng_trace_chunk *trace_chunk;
2625
2626 DBG("Creating initial trace chunk of session \"%s\"",
2627 session->name);
2628 trace_chunk = session_create_new_trace_chunk(
2629 session, NULL, NULL, NULL);
2630 if (!trace_chunk) {
2631 ret = LTTNG_ERR_CREATE_DIR_FAIL;
2632 goto error;
2633 }
2634 assert(!session->current_trace_chunk);
2635 ret = session_set_trace_chunk(session, trace_chunk,
2636 NULL);
2637 lttng_trace_chunk_put(trace_chunk);
2638 if (ret) {
2639 ret = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER;
2640 goto error;
2641 }
2642 } else {
2643 DBG("Rotating session \"%s\" from its current \"NULL\" trace chunk to a new chunk",
2644 session->name);
2645 /*
2646 * Rotate existing streams into the new chunk.
2647 * This is a "quiet" rotation has no client has
2648 * explicitly requested this operation.
2649 *
2650 * There is also no need to wait for the rotation
2651 * to complete as it will happen immediately. No data
2652 * was produced as the session was stopped, so the
2653 * rotation should happen on reception of the command.
2654 */
2655 ret = cmd_rotate_session(session, NULL, true);
2656 if (ret != LTTNG_OK) {
2657 goto error;
2658 }
5c408ad8 2659 }
c996624c
JD
2660 }
2661
2f77fc4b
DG
2662 /* Kernel tracing */
2663 if (ksession != NULL) {
c996624c 2664 DBG("Start kernel tracing session %s", session->name);
7d268848 2665 ret = start_kernel_session(ksession);
9b6c7ec5 2666 if (ret != LTTNG_OK) {
2f77fc4b
DG
2667 goto error;
2668 }
2f77fc4b
DG
2669 }
2670
2671 /* Flag session that trace should start automatically */
2672 if (usess) {
82b69413
JG
2673 int int_ret = ust_app_start_trace_all(usess);
2674
2675 if (int_ret < 0) {
f73fabfd 2676 ret = LTTNG_ERR_UST_START_FAIL;
2f77fc4b
DG
2677 goto error;
2678 }
2679 }
2680
5c408ad8
JD
2681 /*
2682 * Clear the flag that indicates that a rotation was done while the
2683 * session was stopped.
2684 */
2685 session->rotated_after_last_stop = false;
2686
259c2674 2687 if (session->rotate_timer_period) {
82b69413
JG
2688 int int_ret = timer_session_rotation_schedule_timer_start(
2689 session, session->rotate_timer_period);
2690
2691 if (int_ret < 0) {
259c2674
JD
2692 ERR("Failed to enable rotate timer");
2693 ret = LTTNG_ERR_UNK;
2694 goto error;
2695 }
2696 }
2697
f73fabfd 2698 ret = LTTNG_OK;
2f77fc4b
DG
2699
2700error:
1f496244
JG
2701 if (ret == LTTNG_OK) {
2702 /* Flag this after a successful start. */
2703 session->has_been_started |= 1;
2704 } else {
2705 session->active = 0;
2706 /* Restore initial state on error. */
2707 session->rotated_after_last_stop =
2708 session_rotated_after_last_stop;
2709 }
2f77fc4b
DG
2710 return ret;
2711}
2712
2713/*
2714 * Command LTTNG_STOP_TRACE processed by the client thread.
2715 */
2716int cmd_stop_trace(struct ltt_session *session)
2717{
2718 int ret;
2719 struct ltt_kernel_channel *kchan;
2720 struct ltt_kernel_session *ksession;
2721 struct ltt_ust_session *usess;
a9577b76 2722 bool error_occurred = false;
2f77fc4b
DG
2723
2724 assert(session);
2725
5c408ad8 2726 DBG("Begin stop session %s (id %" PRIu64 ")", session->name, session->id);
2f77fc4b
DG
2727 /* Short cut */
2728 ksession = session->kernel_session;
2729 usess = session->ust_session;
2730
8382cf6f
DG
2731 /* Session is not active. Skip everythong and inform the client. */
2732 if (!session->active) {
f73fabfd 2733 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2f77fc4b
DG
2734 goto error;
2735 }
2736
2f77fc4b 2737 /* Kernel tracer */
14fb1ebe 2738 if (ksession && ksession->active) {
2f77fc4b
DG
2739 DBG("Stop kernel tracing");
2740
566d8970
MD
2741 ret = kernel_stop_session(ksession);
2742 if (ret < 0) {
2743 ret = LTTNG_ERR_KERN_STOP_FAIL;
2744 goto error;
2745 }
2746
7d268848 2747 kernel_wait_quiescent();
566d8970
MD
2748
2749 /* Flush metadata after stopping (if exists) */
2f77fc4b
DG
2750 if (ksession->metadata_stream_fd >= 0) {
2751 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2752 if (ret < 0) {
2753 ERR("Kernel metadata flush failed");
a46a2b76 2754 error_occurred = true;
2f77fc4b
DG
2755 }
2756 }
2757
566d8970 2758 /* Flush all buffers after stopping */
2f77fc4b
DG
2759 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2760 ret = kernel_flush_buffer(kchan);
2761 if (ret < 0) {
2762 ERR("Kernel flush buffer error");
a46a2b76 2763 error_occurred = true;
2f77fc4b
DG
2764 }
2765 }
2766
14fb1ebe 2767 ksession->active = 0;
5c408ad8
JD
2768 DBG("Kernel session stopped %s (id %" PRIu64 ")", session->name,
2769 session->id);
2f77fc4b
DG
2770 }
2771
14fb1ebe 2772 if (usess && usess->active) {
2f77fc4b
DG
2773 ret = ust_app_stop_trace_all(usess);
2774 if (ret < 0) {
f73fabfd 2775 ret = LTTNG_ERR_UST_STOP_FAIL;
2f77fc4b
DG
2776 goto error;
2777 }
2778 }
2779
8382cf6f
DG
2780 /* Flag inactive after a successful stop. */
2781 session->active = 0;
a9577b76 2782 ret = !error_occurred ? LTTNG_OK : LTTNG_ERR_UNK;
2f77fc4b
DG
2783
2784error:
2785 return ret;
2786}
2787
2788/*
433f5ba9
JR
2789 * Set the base_path of the session only if subdir of a control uris is set.
2790 * Return LTTNG_OK on success, otherwise LTTNG_ERR_*.
2f77fc4b 2791 */
433f5ba9
JR
2792static int set_session_base_path_from_uris(struct ltt_session *session,
2793 size_t nb_uri,
bda32d56 2794 struct lttng_uri *uris)
2f77fc4b 2795{
433f5ba9
JR
2796 int ret;
2797 size_t i;
2f77fc4b 2798
e3876bf0
JR
2799 for (i = 0; i < nb_uri; i++) {
2800 if (uris[i].stype != LTTNG_STREAM_CONTROL ||
2801 uris[i].subdir[0] == '\0') {
2802 /* Not interested in these URIs */
2803 continue;
2804 }
2805
2806 if (session->base_path != NULL) {
2807 free(session->base_path);
2808 session->base_path = NULL;
2809 }
2810
2811 /* Set session base_path */
2812 session->base_path = strdup(uris[i].subdir);
2813 if (!session->base_path) {
433f5ba9
JR
2814 PERROR("Failed to copy base path \"%s\" to session \"%s\"",
2815 uris[i].subdir, session->name);
2816 ret = LTTNG_ERR_NOMEM;
e3876bf0
JR
2817 goto error;
2818 }
433f5ba9
JR
2819 DBG2("Setting base path \"%s\" for session \"%s\"",
2820 session->base_path, session->name);
2821 }
2822 ret = LTTNG_OK;
2823error:
2824 return ret;
2825}
2826
2827/*
2828 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2829 */
2830int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2831 struct lttng_uri *uris)
2832{
2833 int ret, i;
2834 struct ltt_kernel_session *ksess = session->kernel_session;
2835 struct ltt_ust_session *usess = session->ust_session;
2836
2837 assert(session);
2838 assert(uris);
2839 assert(nb_uri > 0);
2840
2841 /* Can't set consumer URI if the session is active. */
2842 if (session->active) {
2843 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2844 goto error;
2845 }
2846
2847 /*
2848 * Set the session base path if any. This is done inside
2849 * cmd_set_consumer_uri to preserve backward compatibility of the
2850 * previous session creation api vs the session descriptor api.
2851 */
2852 ret = set_session_base_path_from_uris(session, nb_uri, uris);
2853 if (ret != LTTNG_OK) {
2854 goto error;
e3876bf0
JR
2855 }
2856
bda32d56 2857 /* Set the "global" consumer URIs */
2f77fc4b 2858 for (i = 0; i < nb_uri; i++) {
e3876bf0
JR
2859 ret = add_uri_to_consumer(session, session->consumer, &uris[i],
2860 LTTNG_DOMAIN_NONE);
a74934ba 2861 if (ret != LTTNG_OK) {
2f77fc4b
DG
2862 goto error;
2863 }
2f77fc4b
DG
2864 }
2865
bda32d56
JG
2866 /* Set UST session URIs */
2867 if (session->ust_session) {
2868 for (i = 0; i < nb_uri; i++) {
b178f53e 2869 ret = add_uri_to_consumer(session,
bda32d56 2870 session->ust_session->consumer,
b178f53e 2871 &uris[i], LTTNG_DOMAIN_UST);
bda32d56
JG
2872 if (ret != LTTNG_OK) {
2873 goto error;
2874 }
2875 }
2876 }
2877
2878 /* Set kernel session URIs */
2879 if (session->kernel_session) {
2880 for (i = 0; i < nb_uri; i++) {
b178f53e 2881 ret = add_uri_to_consumer(session,
bda32d56 2882 session->kernel_session->consumer,
b178f53e 2883 &uris[i], LTTNG_DOMAIN_KERNEL);
bda32d56
JG
2884 if (ret != LTTNG_OK) {
2885 goto error;
2886 }
2887 }
2888 }
2889
7ab70fe0
DG
2890 /*
2891 * Make sure to set the session in output mode after we set URI since a
2892 * session can be created without URL (thus flagged in no output mode).
2893 */
2894 session->output_traces = 1;
2895 if (ksess) {
2896 ksess->output_traces = 1;
bda32d56
JG
2897 }
2898
2899 if (usess) {
7ab70fe0
DG
2900 usess->output_traces = 1;
2901 }
2902
2f77fc4b 2903 /* All good! */
f73fabfd 2904 ret = LTTNG_OK;
2f77fc4b
DG
2905
2906error:
2907 return ret;
2908}
2909
b178f53e
JG
2910static
2911enum lttng_error_code set_session_output_from_descriptor(
2912 struct ltt_session *session,
2913 const struct lttng_session_descriptor *descriptor)
2f77fc4b
DG
2914{
2915 int ret;
b178f53e
JG
2916 enum lttng_error_code ret_code = LTTNG_OK;
2917 enum lttng_session_descriptor_type session_type =
2918 lttng_session_descriptor_get_type(descriptor);
2919 enum lttng_session_descriptor_output_type output_type =
2920 lttng_session_descriptor_get_output_type(descriptor);
2921 struct lttng_uri uris[2] = {};
2922 size_t uri_count = 0;
2923
2924 switch (output_type) {
2925 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NONE:
2926 goto end;
2927 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_LOCAL:
2928 lttng_session_descriptor_get_local_output_uri(descriptor,
2929 &uris[0]);
2930 uri_count = 1;
2931 break;
2932 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NETWORK:
2933 lttng_session_descriptor_get_network_output_uris(descriptor,
2934 &uris[0], &uris[1]);
2935 uri_count = 2;
2936 break;
2937 default:
2938 ret_code = LTTNG_ERR_INVALID;
e32d7f27 2939 goto end;
2f77fc4b
DG
2940 }
2941
b178f53e
JG
2942 switch (session_type) {
2943 case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT:
2944 {
2945 struct snapshot_output *new_output = NULL;
2946
2947 new_output = snapshot_output_alloc();
2948 if (!new_output) {
2949 ret_code = LTTNG_ERR_NOMEM;
2950 goto end;
2951 }
2952
2953 ret = snapshot_output_init_with_uri(session,
2954 DEFAULT_SNAPSHOT_MAX_SIZE,
2955 NULL, uris, uri_count, session->consumer,
2956 new_output, &session->snapshot);
2957 if (ret < 0) {
2958 ret_code = (ret == -ENOMEM) ?
2959 LTTNG_ERR_NOMEM : LTTNG_ERR_INVALID;
2960 snapshot_output_destroy(new_output);
2961 goto end;
2962 }
2963 snapshot_add_output(&session->snapshot, new_output);
2964 break;
2965 }
2966 case LTTNG_SESSION_DESCRIPTOR_TYPE_REGULAR:
2967 case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE:
2968 {
2969 ret_code = cmd_set_consumer_uri(session, uri_count, uris);
2970 break;
2971 }
2972 default:
2973 ret_code = LTTNG_ERR_INVALID;
e32d7f27 2974 goto end;
2f77fc4b 2975 }
b178f53e
JG
2976end:
2977 return ret_code;
2978}
2979
2980static
2981enum lttng_error_code cmd_create_session_from_descriptor(
2982 struct lttng_session_descriptor *descriptor,
2983 const lttng_sock_cred *creds,
2984 const char *home_path)
2985{
2986 int ret;
2987 enum lttng_error_code ret_code;
2988 const char *session_name;
2989 struct ltt_session *new_session = NULL;
2990 enum lttng_session_descriptor_status descriptor_status;
2f77fc4b 2991
e32d7f27 2992 session_lock_list();
b178f53e
JG
2993 if (home_path) {
2994 if (*home_path != '/') {
2995 ERR("Home path provided by client is not absolute");
2996 ret_code = LTTNG_ERR_INVALID;
2997 goto end;
2998 }
2999 }
2f77fc4b 3000
b178f53e
JG
3001 descriptor_status = lttng_session_descriptor_get_session_name(
3002 descriptor, &session_name);
3003 switch (descriptor_status) {
3004 case LTTNG_SESSION_DESCRIPTOR_STATUS_OK:
3005 break;
3006 case LTTNG_SESSION_DESCRIPTOR_STATUS_UNSET:
3007 session_name = NULL;
3008 break;
3009 default:
3010 ret_code = LTTNG_ERR_INVALID;
3011 goto end;
3012 }
e3876bf0 3013
b178f53e 3014 ret_code = session_create(session_name, creds->uid, creds->gid,
e3876bf0 3015 &new_session);
b178f53e 3016 if (ret_code != LTTNG_OK) {
e32d7f27 3017 goto end;
2f77fc4b
DG
3018 }
3019
b178f53e
JG
3020 if (!session_name) {
3021 ret = lttng_session_descriptor_set_session_name(descriptor,
3022 new_session->name);
3023 if (ret) {
3024 ret_code = LTTNG_ERR_SESSION_FAIL;
3025 goto end;
3026 }
3027 }
3028
3029 if (!lttng_session_descriptor_is_output_destination_initialized(
3030 descriptor)) {
3031 /*
3032 * Only include the session's creation time in the output
3033 * destination if the name of the session itself was
3034 * not auto-generated.
3035 */
3036 ret_code = lttng_session_descriptor_set_default_output(
3037 descriptor,
3038 session_name ? &new_session->creation_time : NULL,
3039 home_path);
3040 if (ret_code != LTTNG_OK) {
e32d7f27 3041 goto end;
2bba9e53 3042 }
2bba9e53 3043 } else {
b178f53e
JG
3044 new_session->has_user_specified_directory =
3045 lttng_session_descriptor_has_output_directory(
3046 descriptor);
2f77fc4b
DG
3047 }
3048
b178f53e
JG
3049 switch (lttng_session_descriptor_get_type(descriptor)) {
3050 case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT:
3051 new_session->snapshot_mode = 1;
3052 break;
3053 case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE:
3054 new_session->live_timer =
3055 lttng_session_descriptor_live_get_timer_interval(
3056 descriptor);
3057 break;
3058 default:
3059 break;
3060 }
2f77fc4b 3061
b178f53e
JG
3062 ret_code = set_session_output_from_descriptor(new_session, descriptor);
3063 if (ret_code != LTTNG_OK) {
3064 goto end;
3065 }
3066 new_session->consumer->enabled = 1;
3067 ret_code = LTTNG_OK;
e32d7f27 3068end:
b178f53e
JG
3069 /* Release reference provided by the session_create function. */
3070 session_put(new_session);
3071 if (ret_code != LTTNG_OK && new_session) {
3072 /* Release the global reference on error. */
3073 session_destroy(new_session);
e32d7f27 3074 }
b178f53e
JG
3075 session_unlock_list();
3076 return ret_code;
2f77fc4b
DG
3077}
3078
b178f53e
JG
3079enum lttng_error_code cmd_create_session(struct command_ctx *cmd_ctx, int sock,
3080 struct lttng_session_descriptor **return_descriptor)
27babd3a
DG
3081{
3082 int ret;
b178f53e
JG
3083 size_t payload_size;
3084 struct lttng_dynamic_buffer payload;
3085 struct lttng_buffer_view home_dir_view;
3086 struct lttng_buffer_view session_descriptor_view;
3087 struct lttng_session_descriptor *session_descriptor = NULL;
3088 enum lttng_error_code ret_code;
3089
3090 lttng_dynamic_buffer_init(&payload);
3091 if (cmd_ctx->lsm->u.create_session.home_dir_size >=
3092 LTTNG_PATH_MAX) {
3093 ret_code = LTTNG_ERR_INVALID;
3094 goto error;
27babd3a 3095 }
b178f53e
JG
3096 if (cmd_ctx->lsm->u.create_session.session_descriptor_size >
3097 LTTNG_SESSION_DESCRIPTOR_MAX_LEN) {
3098 ret_code = LTTNG_ERR_INVALID;
3099 goto error;
27babd3a
DG
3100 }
3101
b178f53e
JG
3102 payload_size = cmd_ctx->lsm->u.create_session.home_dir_size +
3103 cmd_ctx->lsm->u.create_session.session_descriptor_size;
3104 ret = lttng_dynamic_buffer_set_size(&payload, payload_size);
3105 if (ret) {
3106 ret_code = LTTNG_ERR_NOMEM;
3107 goto error;
27babd3a
DG
3108 }
3109
b178f53e
JG
3110 ret = lttcomm_recv_unix_sock(sock, payload.data, payload.size);
3111 if (ret <= 0) {
3112 ERR("Reception of session descriptor failed, aborting.");
3113 ret_code = LTTNG_ERR_SESSION_FAIL;
3114 goto error;
27babd3a
DG
3115 }
3116
b178f53e
JG
3117 home_dir_view = lttng_buffer_view_from_dynamic_buffer(
3118 &payload,
3119 0,
3120 cmd_ctx->lsm->u.create_session.home_dir_size);
3121 session_descriptor_view = lttng_buffer_view_from_dynamic_buffer(
3122 &payload,
3123 cmd_ctx->lsm->u.create_session.home_dir_size,
3124 cmd_ctx->lsm->u.create_session.session_descriptor_size);
27babd3a 3125
b178f53e
JG
3126 ret = lttng_session_descriptor_create_from_buffer(
3127 &session_descriptor_view, &session_descriptor);
3128 if (ret < 0) {
3129 ERR("Failed to create session descriptor from payload of \"create session\" command");
3130 ret_code = LTTNG_ERR_INVALID;
3131 goto error;
3132 }
27babd3a 3133
b178f53e
JG
3134 /*
3135 * Sets the descriptor's auto-generated properties (name, output) if
3136 * needed.
3137 */
3138 ret_code = cmd_create_session_from_descriptor(session_descriptor,
3139 &cmd_ctx->creds,
3140 home_dir_view.size ? home_dir_view.data : NULL);
3141 if (ret_code != LTTNG_OK) {
3142 goto error;
e32d7f27 3143 }
b178f53e
JG
3144
3145 ret_code = LTTNG_OK;
3146 *return_descriptor = session_descriptor;
3147 session_descriptor = NULL;
3148error:
3149 lttng_dynamic_buffer_reset(&payload);
3150 lttng_session_descriptor_destroy(session_descriptor);
3151 return ret_code;
27babd3a
DG
3152}
3153
3e3665b8
JG
3154static
3155void cmd_destroy_session_reply(const struct ltt_session *session,
3156 void *_reply_context)
3157{
3158 int ret;
3159 ssize_t comm_ret;
3160 const struct cmd_destroy_session_reply_context *reply_context =
3161 _reply_context;
3162 struct lttng_dynamic_buffer payload;
3163 struct lttcomm_session_destroy_command_header cmd_header;
3164 struct lttng_trace_archive_location *location = NULL;
3165 struct lttcomm_lttng_msg llm = {
3166 .cmd_type = LTTNG_DESTROY_SESSION,
3285a971 3167 .ret_code = reply_context->destruction_status,
3e3665b8
JG
3168 .pid = UINT32_MAX,
3169 .cmd_header_size =
3170 sizeof(struct lttcomm_session_destroy_command_header),
3171 .data_size = 0,
3172 };
3173 size_t payload_size_before_location;
3174
3175 lttng_dynamic_buffer_init(&payload);
3176
3177 ret = lttng_dynamic_buffer_append(&payload, &llm, sizeof(llm));
3178 if (ret) {
3179 ERR("Failed to append session destruction message");
3180 goto error;
3181 }
3182
3183 cmd_header.rotation_state =
3184 (int32_t) (reply_context->implicit_rotation_on_destroy ?
3185 session->rotation_state :
3186 LTTNG_ROTATION_STATE_NO_ROTATION);
3187 ret = lttng_dynamic_buffer_append(&payload, &cmd_header,
3188 sizeof(cmd_header));
3189 if (ret) {
3190 ERR("Failed to append session destruction command header");
3191 goto error;
3192 }
3193
3194 if (!reply_context->implicit_rotation_on_destroy) {
3195 DBG("No implicit rotation performed during the destruction of session \"%s\", sending reply",
3196 session->name);
3197 goto send_reply;
3198 }
3199 if (session->rotation_state != LTTNG_ROTATION_STATE_COMPLETED) {
3200 DBG("Rotation state of session \"%s\" is not \"completed\", sending session destruction reply",
3201 session->name);
3202 goto send_reply;
3203 }
3204
3205 location = session_get_trace_archive_location(session);
3206 if (!location) {
3207 ERR("Failed to get the location of the trace archive produced during the destruction of session \"%s\"",
3208 session->name);
3209 goto error;
3210 }
3211
3212 payload_size_before_location = payload.size;
3213 comm_ret = lttng_trace_archive_location_serialize(location,
3214 &payload);
3215 if (comm_ret < 0) {
3216 ERR("Failed to serialize the location of the trace archive produced during the destruction of session \"%s\"",
3217 session->name);
3218 goto error;
3219 }
3220 /* Update the message to indicate the location's length. */
3221 ((struct lttcomm_lttng_msg *) payload.data)->data_size =
3222 payload.size - payload_size_before_location;
3223send_reply:
3224 comm_ret = lttcomm_send_unix_sock(reply_context->reply_sock_fd,
3225 payload.data, payload.size);
3226 if (comm_ret != (ssize_t) payload.size) {
3227 ERR("Failed to send result of the destruction of session \"%s\" to client",
3228 session->name);
3229 }
3230error:
3231 ret = close(reply_context->reply_sock_fd);
3232 if (ret) {
3233 PERROR("Failed to close client socket in deferred session destroy reply");
3234 }
3235 lttng_dynamic_buffer_reset(&payload);
3236 free(_reply_context);
3237}
3238
2f77fc4b
DG
3239/*
3240 * Command LTTNG_DESTROY_SESSION processed by the client thread.
a9ad0c8f
MD
3241 *
3242 * Called with session lock held.
2f77fc4b 3243 */
e32d7f27 3244int cmd_destroy_session(struct ltt_session *session,
3e3665b8
JG
3245 struct notification_thread_handle *notification_thread_handle,
3246 int *sock_fd)
2f77fc4b
DG
3247{
3248 int ret;
3285a971 3249 enum lttng_error_code destruction_last_error = LTTNG_OK;
3e3665b8
JG
3250 struct cmd_destroy_session_reply_context *reply_context = NULL;
3251
3252 if (sock_fd) {
3253 reply_context = zmalloc(sizeof(*reply_context));
3254 if (!reply_context) {
3255 ret = LTTNG_ERR_NOMEM;
3256 goto end;
3257 }
3258 reply_context->reply_sock_fd = *sock_fd;
3259 }
2f77fc4b
DG
3260
3261 /* Safety net */
3262 assert(session);
3263
3e3665b8
JG
3264 DBG("Begin destroy session %s (id %" PRIu64 ")", session->name,
3265 session->id);
3266 if (session->active) {
3267 DBG("Session \"%s\" is active, attempting to stop it before destroying it",
3268 session->name);
3269 ret = cmd_stop_trace(session);
3270 if (ret != LTTNG_OK && ret != LTTNG_ERR_TRACE_ALREADY_STOPPED) {
3271 /* Carry on with the destruction of the session. */
3272 ERR("Failed to stop session \"%s\" as part of its destruction: %s",
3273 session->name, lttng_strerror(-ret));
3285a971 3274 destruction_last_error = ret;
3e3665b8
JG
3275 }
3276 }
5c408ad8 3277
92816cc3
JG
3278 if (session->rotation_schedule_timer_enabled) {
3279 if (timer_session_rotation_schedule_timer_stop(
3280 session)) {
3281 ERR("Failed to stop the \"rotation schedule\" timer of session %s",
3282 session->name);