Fix: lttng: out-of-bound copy of arguments in 'view' command handler
[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
CommitLineData
2f77fc4b
DG
1/*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
bdf64013 3 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
2f77fc4b
DG
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License, version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 51
16 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
6c1c0768 19#define _LGPL_SOURCE
2f77fc4b 20#include <assert.h>
6dc3064a 21#include <inttypes.h>
2f77fc4b
DG
22#include <urcu/list.h>
23#include <urcu/uatomic.h>
a503e1ef 24#include <sys/stat.h>
d2956687 25#include <stdio.h>
2f77fc4b
DG
26
27#include <common/defaults.h>
28#include <common/common.h>
29#include <common/sessiond-comm/sessiond-comm.h>
30#include <common/relayd/relayd.h>
10a50311 31#include <common/utils.h>
f5436bfc 32#include <common/compat/string.h>
93ec662e 33#include <common/kernel-ctl/kernel-ctl.h>
b0880ae5
JG
34#include <common/dynamic-buffer.h>
35#include <common/buffer-view.h>
82b69413 36#include <common/trace-chunk.h>
3e3665b8 37#include <lttng/location-internal.h>
b0880ae5
JG
38#include <lttng/trigger/trigger-internal.h>
39#include <lttng/condition/condition.h>
40#include <lttng/action/action.h>
6e21424e 41#include <lttng/channel.h>
b0880ae5 42#include <lttng/channel-internal.h>
5c408ad8 43#include <lttng/rotate-internal.h>
17dd1232 44#include <lttng/location-internal.h>
b178f53e 45#include <lttng/session-internal.h>
3c02e545 46#include <lttng/userspace-probe-internal.h>
b178f53e 47#include <lttng/session-descriptor-internal.h>
9f449915 48#include <common/string-utils/string-utils.h>
2f77fc4b
DG
49
50#include "channel.h"
51#include "consumer.h"
52#include "event.h"
8782cc74 53#include "health-sessiond.h"
2f77fc4b
DG
54#include "kernel.h"
55#include "kernel-consumer.h"
56#include "lttng-sessiond.h"
57#include "utils.h"
0dbc2034 58#include "lttng-syscall.h"
7c1d2758 59#include "agent.h"
93ec662e 60#include "buffer-registry.h"
b0880ae5
JG
61#include "notification-thread.h"
62#include "notification-thread-commands.h"
5c408ad8
JD
63#include "rotate.h"
64#include "rotation-thread.h"
8e319828 65#include "timer.h"
f28f9e44 66#include "agent-thread.h"
2f77fc4b
DG
67
68#include "cmd.h"
69
a503e1ef
JG
70/* Sleep for 100ms between each check for the shm path's deletion. */
71#define SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US 100000
72
3e3665b8
JG
73struct cmd_destroy_session_reply_context {
74 int reply_sock_fd;
75 bool implicit_rotation_on_destroy;
76};
77
a503e1ef
JG
78static enum lttng_error_code wait_on_path(void *path);
79
80/*
81 * Command completion handler that is used by the destroy command
82 * when a session that has a non-default shm_path is being destroyed.
83 *
84 * See comment in cmd_destroy_session() for the rationale.
85 */
86static struct destroy_completion_handler {
87 struct cmd_completion_handler handler;
88 char shm_path[member_sizeof(struct ltt_session, shm_path)];
89} destroy_completion_handler = {
90 .handler = {
91 .run = wait_on_path,
92 .data = destroy_completion_handler.shm_path
93 },
94 .shm_path = { 0 },
95};
96
97static struct cmd_completion_handler *current_completion_handler;
98
2f77fc4b
DG
99/*
100 * Used to keep a unique index for each relayd socket created where this value
101 * is associated with streams on the consumer so it can match the right relayd
d88aee68
DG
102 * to send to. It must be accessed with the relayd_net_seq_idx_lock
103 * held.
2f77fc4b 104 */
d88aee68
DG
105static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
106static uint64_t relayd_net_seq_idx;
2f77fc4b 107
7076b56e
JG
108static int validate_ust_event_name(const char *);
109static int cmd_enable_event_internal(struct ltt_session *session,
df4f5a87 110 const struct lttng_domain *domain,
7076b56e
JG
111 char *channel_name, struct lttng_event *event,
112 char *filter_expression,
113 struct lttng_filter_bytecode *filter,
114 struct lttng_event_exclusion *exclusion,
115 int wpipe);
116
2f77fc4b
DG
117/*
118 * Create a session path used by list_lttng_sessions for the case that the
119 * session consumer is on the network.
120 */
121static int build_network_session_path(char *dst, size_t size,
122 struct ltt_session *session)
123{
124 int ret, kdata_port, udata_port;
125 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
126 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
127
128 assert(session);
129 assert(dst);
130
131 memset(tmp_urls, 0, sizeof(tmp_urls));
132 memset(tmp_uurl, 0, sizeof(tmp_uurl));
133
134 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
135
136 if (session->kernel_session && session->kernel_session->consumer) {
137 kuri = &session->kernel_session->consumer->dst.net.control;
138 kdata_port = session->kernel_session->consumer->dst.net.data.port;
139 }
140
141 if (session->ust_session && session->ust_session->consumer) {
142 uuri = &session->ust_session->consumer->dst.net.control;
143 udata_port = session->ust_session->consumer->dst.net.data.port;
144 }
145
146 if (uuri == NULL && kuri == NULL) {
147 uri = &session->consumer->dst.net.control;
148 kdata_port = session->consumer->dst.net.data.port;
149 } else if (kuri && uuri) {
150 ret = uri_compare(kuri, uuri);
151 if (ret) {
152 /* Not Equal */
153 uri = kuri;
154 /* Build uuri URL string */
155 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
156 if (ret < 0) {
157 goto error;
158 }
159 } else {
160 uri = kuri;
161 }
162 } else if (kuri && uuri == NULL) {
163 uri = kuri;
164 } else if (uuri && kuri == NULL) {
165 uri = uuri;
166 }
167
168 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
169 if (ret < 0) {
170 goto error;
171 }
172
9aa9f900
DG
173 /*
174 * Do we have a UST url set. If yes, this means we have both kernel and UST
175 * to print.
176 */
9d035200 177 if (*tmp_uurl != '\0') {
2f77fc4b
DG
178 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
179 tmp_urls, kdata_port, tmp_uurl, udata_port);
180 } else {
9aa9f900 181 int dport;
bef08707 182 if (kuri || (!kuri && !uuri)) {
9aa9f900
DG
183 dport = kdata_port;
184 } else {
185 /* No kernel URI, use the UST port. */
186 dport = udata_port;
187 }
188 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
2f77fc4b
DG
189 }
190
191error:
192 return ret;
193}
194
fb83fe64
JD
195/*
196 * Get run-time attributes if the session has been started (discarded events,
197 * lost packets).
198 */
199static int get_kernel_runtime_stats(struct ltt_session *session,
200 struct ltt_kernel_channel *kchan, uint64_t *discarded_events,
201 uint64_t *lost_packets)
202{
203 int ret;
204
205 if (!session->has_been_started) {
206 ret = 0;
207 *discarded_events = 0;
208 *lost_packets = 0;
209 goto end;
210 }
211
e1f3997a 212 ret = consumer_get_discarded_events(session->id, kchan->key,
fb83fe64
JD
213 session->kernel_session->consumer,
214 discarded_events);
215 if (ret < 0) {
216 goto end;
217 }
218
e1f3997a 219 ret = consumer_get_lost_packets(session->id, kchan->key,
fb83fe64
JD
220 session->kernel_session->consumer,
221 lost_packets);
222 if (ret < 0) {
223 goto end;
224 }
225
226end:
227 return ret;
228}
229
230/*
231 * Get run-time attributes if the session has been started (discarded events,
232 * lost packets).
233 */
234static int get_ust_runtime_stats(struct ltt_session *session,
235 struct ltt_ust_channel *uchan, uint64_t *discarded_events,
236 uint64_t *lost_packets)
237{
238 int ret;
239 struct ltt_ust_session *usess;
240
a91c5803
JG
241 if (!discarded_events || !lost_packets) {
242 ret = -1;
243 goto end;
244 }
245
fb83fe64 246 usess = session->ust_session;
a905c624
JG
247 assert(discarded_events);
248 assert(lost_packets);
fb83fe64
JD
249
250 if (!usess || !session->has_been_started) {
251 *discarded_events = 0;
252 *lost_packets = 0;
253 ret = 0;
254 goto end;
255 }
256
257 if (usess->buffer_type == LTTNG_BUFFER_PER_UID) {
258 ret = ust_app_uid_get_channel_runtime_stats(usess->id,
259 &usess->buffer_reg_uid_list,
260 usess->consumer, uchan->id,
261 uchan->attr.overwrite,
262 discarded_events,
263 lost_packets);
264 } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) {
265 ret = ust_app_pid_get_channel_runtime_stats(usess,
266 uchan, usess->consumer,
267 uchan->attr.overwrite,
268 discarded_events,
269 lost_packets);
270 if (ret < 0) {
271 goto end;
272 }
273 *discarded_events += uchan->per_pid_closed_app_discarded;
274 *lost_packets += uchan->per_pid_closed_app_lost;
275 } else {
276 ERR("Unsupported buffer type");
967bc289 277 assert(0);
fb83fe64
JD
278 ret = -1;
279 goto end;
280 }
281
282end:
283 return ret;
284}
285
2f77fc4b
DG
286/*
287 * Fill lttng_channel array of all channels.
288 */
d449df4a 289static ssize_t list_lttng_channels(enum lttng_domain_type domain,
fb83fe64 290 struct ltt_session *session, struct lttng_channel *channels,
cf0bcb51 291 struct lttng_channel_extended *chan_exts)
2f77fc4b 292{
d449df4a 293 int i = 0, ret = 0;
2f77fc4b
DG
294 struct ltt_kernel_channel *kchan;
295
296 DBG("Listing channels for session %s", session->name);
297
298 switch (domain) {
299 case LTTNG_DOMAIN_KERNEL:
300 /* Kernel channels */
301 if (session->kernel_session != NULL) {
302 cds_list_for_each_entry(kchan,
303 &session->kernel_session->channel_list.head, list) {
fb83fe64 304 uint64_t discarded_events, lost_packets;
cf0bcb51
JG
305 struct lttng_channel_extended *extended;
306
307 extended = (struct lttng_channel_extended *)
308 kchan->channel->attr.extended.ptr;
fb83fe64
JD
309
310 ret = get_kernel_runtime_stats(session, kchan,
311 &discarded_events, &lost_packets);
312 if (ret < 0) {
313 goto end;
314 }
2f77fc4b
DG
315 /* Copy lttng_channel struct to array */
316 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
317 channels[i].enabled = kchan->enabled;
fb83fe64
JD
318 chan_exts[i].discarded_events =
319 discarded_events;
320 chan_exts[i].lost_packets = lost_packets;
cf0bcb51
JG
321 chan_exts[i].monitor_timer_interval =
322 extended->monitor_timer_interval;
491d1539 323 chan_exts[i].blocking_timeout = 0;
2f77fc4b
DG
324 i++;
325 }
326 }
327 break;
328 case LTTNG_DOMAIN_UST:
329 {
330 struct lttng_ht_iter iter;
331 struct ltt_ust_channel *uchan;
332
e7fe706f 333 rcu_read_lock();
2f77fc4b
DG
334 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
335 &iter.iter, uchan, node.node) {
a91c5803 336 uint64_t discarded_events = 0, lost_packets = 0;
fb83fe64 337
8ee609c8
MD
338 if (lttng_strncpy(channels[i].name, uchan->name,
339 LTTNG_SYMBOL_NAME_LEN)) {
340 break;
341 }
2f77fc4b
DG
342 channels[i].attr.overwrite = uchan->attr.overwrite;
343 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
344 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
345 channels[i].attr.switch_timer_interval =
346 uchan->attr.switch_timer_interval;
347 channels[i].attr.read_timer_interval =
348 uchan->attr.read_timer_interval;
349 channels[i].enabled = uchan->enabled;
2f785fe7
DG
350 channels[i].attr.tracefile_size = uchan->tracefile_size;
351 channels[i].attr.tracefile_count = uchan->tracefile_count;
5e4435a4
JG
352
353 /*
354 * Map enum lttng_ust_output to enum lttng_event_output.
355 */
2f77fc4b
DG
356 switch (uchan->attr.output) {
357 case LTTNG_UST_MMAP:
2f77fc4b
DG
358 channels[i].attr.output = LTTNG_EVENT_MMAP;
359 break;
5e4435a4
JG
360 default:
361 /*
362 * LTTNG_UST_MMAP is the only supported UST
363 * output mode.
364 */
365 assert(0);
366 break;
2f77fc4b 367 }
fb83fe64 368
d449df4a
MD
369 chan_exts[i].monitor_timer_interval =
370 uchan->monitor_timer_interval;
491d1539
MD
371 chan_exts[i].blocking_timeout =
372 uchan->attr.u.s.blocking_timeout;
d449df4a 373
fb83fe64
JD
374 ret = get_ust_runtime_stats(session, uchan,
375 &discarded_events, &lost_packets);
376 if (ret < 0) {
377 break;
378 }
379 chan_exts[i].discarded_events = discarded_events;
380 chan_exts[i].lost_packets = lost_packets;
2f77fc4b
DG
381 i++;
382 }
e7fe706f 383 rcu_read_unlock();
2f77fc4b
DG
384 break;
385 }
386 default:
387 break;
388 }
fb83fe64
JD
389
390end:
d449df4a
MD
391 if (ret < 0) {
392 return -LTTNG_ERR_FATAL;
393 } else {
394 return LTTNG_OK;
395 }
2f77fc4b
DG
396}
397
3c02e545
FD
398static int increment_extended_len(const char *filter_expression,
399 struct lttng_event_exclusion *exclusion,
400 const struct lttng_userspace_probe_location *probe_location,
401 size_t *extended_len)
b4e3ceb9 402{
3c02e545
FD
403 int ret = 0;
404
b4e3ceb9
PP
405 *extended_len += sizeof(struct lttcomm_event_extended_header);
406
407 if (filter_expression) {
408 *extended_len += strlen(filter_expression) + 1;
409 }
795d57ce
PP
410
411 if (exclusion) {
412 *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN;
413 }
3c02e545
FD
414
415 if (probe_location) {
416 ret = lttng_userspace_probe_location_serialize(probe_location,
417 NULL, NULL);
418 if (ret < 0) {
419 goto end;
420 }
421 *extended_len += ret;
422 }
423 ret = 0;
424end:
425 return ret;
b4e3ceb9
PP
426}
427
3c02e545
FD
428static int append_extended_info(const char *filter_expression,
429 struct lttng_event_exclusion *exclusion,
430 struct lttng_userspace_probe_location *probe_location,
431 void **extended_at)
b4e3ceb9 432{
3c02e545 433 int ret = 0;
b4e3ceb9 434 size_t filter_len = 0;
795d57ce 435 size_t nb_exclusions = 0;
3c02e545
FD
436 size_t userspace_probe_location_len = 0;
437 struct lttng_dynamic_buffer location_buffer;
438 struct lttcomm_event_extended_header extended_header;
b4e3ceb9
PP
439
440 if (filter_expression) {
441 filter_len = strlen(filter_expression) + 1;
442 }
443
795d57ce
PP
444 if (exclusion) {
445 nb_exclusions = exclusion->count;
446 }
447
3c02e545
FD
448 if (probe_location) {
449 lttng_dynamic_buffer_init(&location_buffer);
450 ret = lttng_userspace_probe_location_serialize(probe_location,
451 &location_buffer, NULL);
452 if (ret < 0) {
453 ret = -1;
454 goto end;
455 }
456 userspace_probe_location_len = location_buffer.size;
457 }
458
795d57ce 459 /* Set header fields */
b4e3ceb9 460 extended_header.filter_len = filter_len;
795d57ce 461 extended_header.nb_exclusions = nb_exclusions;
3c02e545 462 extended_header.userspace_probe_location_len = userspace_probe_location_len;
795d57ce
PP
463
464 /* Copy header */
b4e3ceb9
PP
465 memcpy(*extended_at, &extended_header, sizeof(extended_header));
466 *extended_at += sizeof(extended_header);
795d57ce
PP
467
468 /* Copy filter string */
469 if (filter_expression) {
470 memcpy(*extended_at, filter_expression, filter_len);
471 *extended_at += filter_len;
472 }
473
474 /* Copy exclusion names */
475 if (exclusion) {
476 size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
477
478 memcpy(*extended_at, &exclusion->names, len);
479 *extended_at += len;
480 }
3c02e545
FD
481
482 if (probe_location) {
483 memcpy(*extended_at, location_buffer.data, location_buffer.size);
484 *extended_at += location_buffer.size;
485 lttng_dynamic_buffer_reset(&location_buffer);
486 }
487 ret = 0;
488end:
489 return ret;
b4e3ceb9
PP
490}
491
3c6a091f 492/*
022d91ba 493 * Create a list of agent domain events.
3c6a091f
DG
494 *
495 * Return number of events in list on success or else a negative value.
496 */
022d91ba 497static int list_lttng_agent_events(struct agent *agt,
b4e3ceb9 498 struct lttng_event **events, size_t *total_size)
3c6a091f
DG
499{
500 int i = 0, ret = 0;
501 unsigned int nb_event = 0;
022d91ba 502 struct agent_event *event;
47e52862 503 struct lttng_event *tmp_events = NULL;
3c6a091f 504 struct lttng_ht_iter iter;
b4e3ceb9
PP
505 size_t extended_len = 0;
506 void *extended_at;
3c6a091f 507
022d91ba 508 assert(agt);
3c6a091f
DG
509 assert(events);
510
022d91ba 511 DBG3("Listing agent events");
3c6a091f 512
e5bbf678 513 rcu_read_lock();
022d91ba 514 nb_event = lttng_ht_get_count(agt->events);
e5bbf678 515 rcu_read_unlock();
3c6a091f
DG
516 if (nb_event == 0) {
517 ret = nb_event;
b4e3ceb9 518 *total_size = 0;
3c6a091f
DG
519 goto error;
520 }
521
b4e3ceb9
PP
522 /* Compute required extended infos size */
523 extended_len = nb_event * sizeof(struct lttcomm_event_extended_header);
524
525 /*
526 * This is only valid because the commands which add events are
527 * processed in the same thread as the listing.
528 */
529 rcu_read_lock();
530 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
3c02e545 531 ret = increment_extended_len(event->filter_expression, NULL, NULL,
795d57ce 532 &extended_len);
3c02e545
FD
533 if (ret) {
534 DBG("Error computing the length of extended info message");
535 ret = -LTTNG_ERR_FATAL;
536 goto error;
537 }
b4e3ceb9
PP
538 }
539 rcu_read_unlock();
540
541 *total_size = nb_event * sizeof(*tmp_events) + extended_len;
542 tmp_events = zmalloc(*total_size);
3c6a091f 543 if (!tmp_events) {
022d91ba 544 PERROR("zmalloc agent events session");
3c6a091f
DG
545 ret = -LTTNG_ERR_FATAL;
546 goto error;
547 }
548
b4e3ceb9
PP
549 extended_at = ((uint8_t *) tmp_events) +
550 nb_event * sizeof(struct lttng_event);
551
3c6a091f 552 rcu_read_lock();
022d91ba 553 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
3c6a091f
DG
554 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
555 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
556 tmp_events[i].enabled = event->enabled;
2106efa0 557 tmp_events[i].loglevel = event->loglevel_value;
ff94328f 558 tmp_events[i].loglevel_type = event->loglevel_type;
3c6a091f 559 i++;
b4e3ceb9
PP
560
561 /* Append extended info */
3c02e545 562 ret = append_extended_info(event->filter_expression, NULL, NULL,
795d57ce 563 &extended_at);
3c02e545
FD
564 if (ret) {
565 DBG("Error appending extended info message");
566 ret = -LTTNG_ERR_FATAL;
567 goto error;
568 }
3c6a091f 569 }
3c6a091f
DG
570
571 *events = tmp_events;
572 ret = nb_event;
3c02e545 573 assert(nb_event == i);
3c6a091f 574
47e52862 575end:
3c02e545 576 rcu_read_unlock();
3c6a091f 577 return ret;
47e52862
JG
578error:
579 free(tmp_events);
580 goto end;
3c6a091f
DG
581}
582
2f77fc4b
DG
583/*
584 * Create a list of ust global domain events.
585 */
586static int list_lttng_ust_global_events(char *channel_name,
b4e3ceb9
PP
587 struct ltt_ust_domain_global *ust_global,
588 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
589{
590 int i = 0, ret = 0;
591 unsigned int nb_event = 0;
592 struct lttng_ht_iter iter;
593 struct lttng_ht_node_str *node;
594 struct ltt_ust_channel *uchan;
595 struct ltt_ust_event *uevent;
596 struct lttng_event *tmp;
b4e3ceb9
PP
597 size_t extended_len = 0;
598 void *extended_at;
2f77fc4b
DG
599
600 DBG("Listing UST global events for channel %s", channel_name);
601
602 rcu_read_lock();
603
604 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
605 node = lttng_ht_iter_get_node_str(&iter);
606 if (node == NULL) {
f73fabfd 607 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
d31d3e8c 608 goto end;
2f77fc4b
DG
609 }
610
611 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
612
3c442be3 613 nb_event = lttng_ht_get_count(uchan->events);
2f77fc4b
DG
614 if (nb_event == 0) {
615 ret = nb_event;
b4e3ceb9 616 *total_size = 0;
d31d3e8c 617 goto end;
2f77fc4b
DG
618 }
619
620 DBG3("Listing UST global %d events", nb_event);
621
b4e3ceb9
PP
622 /* Compute required extended infos size */
623 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
624 if (uevent->internal) {
625 nb_event--;
626 continue;
627 }
628
3c02e545
FD
629 ret = increment_extended_len(uevent->filter_expression,
630 uevent->exclusion, NULL, &extended_len);
631 if (ret) {
632 DBG("Error computing the length of extended info message");
633 ret = -LTTNG_ERR_FATAL;
634 goto end;
635 }
b4e3ceb9 636 }
d31d3e8c
PP
637 if (nb_event == 0) {
638 /* All events are internal, skip. */
639 ret = 0;
640 *total_size = 0;
641 goto end;
642 }
b4e3ceb9
PP
643
644 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
645 tmp = zmalloc(*total_size);
2f77fc4b 646 if (tmp == NULL) {
b12c38df
JG
647 ret = -LTTNG_ERR_FATAL;
648 goto end;
2f77fc4b
DG
649 }
650
b4e3ceb9
PP
651 extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event);
652
2f77fc4b 653 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
3c442be3
JG
654 if (uevent->internal) {
655 /* This event should remain hidden from clients */
3c442be3
JG
656 continue;
657 }
2f77fc4b
DG
658 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
659 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
660 tmp[i].enabled = uevent->enabled;
661
662 switch (uevent->attr.instrumentation) {
663 case LTTNG_UST_TRACEPOINT:
664 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
665 break;
666 case LTTNG_UST_PROBE:
667 tmp[i].type = LTTNG_EVENT_PROBE;
668 break;
669 case LTTNG_UST_FUNCTION:
670 tmp[i].type = LTTNG_EVENT_FUNCTION;
671 break;
672 }
673
674 tmp[i].loglevel = uevent->attr.loglevel;
675 switch (uevent->attr.loglevel_type) {
676 case LTTNG_UST_LOGLEVEL_ALL:
677 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
678 break;
679 case LTTNG_UST_LOGLEVEL_RANGE:
680 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
681 break;
682 case LTTNG_UST_LOGLEVEL_SINGLE:
683 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
684 break;
685 }
686 if (uevent->filter) {
687 tmp[i].filter = 1;
688 }
4634f12e
JI
689 if (uevent->exclusion) {
690 tmp[i].exclusion = 1;
691 }
2f77fc4b 692 i++;
b4e3ceb9
PP
693
694 /* Append extended info */
3c02e545
FD
695 ret = append_extended_info(uevent->filter_expression,
696 uevent->exclusion, NULL, &extended_at);
697 if (ret) {
698 DBG("Error appending extended info message");
699 ret = -LTTNG_ERR_FATAL;
700 goto end;
701 }
2f77fc4b
DG
702 }
703
704 ret = nb_event;
705 *events = tmp;
d31d3e8c 706end:
2f77fc4b
DG
707 rcu_read_unlock();
708 return ret;
709}
710
711/*
712 * Fill lttng_event array of all kernel events in the channel.
713 */
714static int list_lttng_kernel_events(char *channel_name,
b4e3ceb9
PP
715 struct ltt_kernel_session *kernel_session,
716 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
717{
718 int i = 0, ret;
719 unsigned int nb_event;
720 struct ltt_kernel_event *event;
721 struct ltt_kernel_channel *kchan;
b4e3ceb9
PP
722 size_t extended_len = 0;
723 void *extended_at;
2f77fc4b
DG
724
725 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
726 if (kchan == NULL) {
f73fabfd 727 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG
728 goto error;
729 }
730
731 nb_event = kchan->event_count;
732
733 DBG("Listing events for channel %s", kchan->channel->name);
734
735 if (nb_event == 0) {
b4e3ceb9 736 *total_size = 0;
834978fd 737 *events = NULL;
db906c12 738 goto end;
2f77fc4b
DG
739 }
740
b4e3ceb9
PP
741 /* Compute required extended infos size */
742 cds_list_for_each_entry(event, &kchan->events_list.head, list) {
3c02e545
FD
743 ret = increment_extended_len(event->filter_expression, NULL,
744 event->userspace_probe_location,
795d57ce 745 &extended_len);
3c02e545
FD
746 if (ret) {
747 DBG("Error computing the length of extended info message");
748 ret = -LTTNG_ERR_FATAL;
749 goto error;
750 }
b4e3ceb9
PP
751 }
752
753 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
754 *events = zmalloc(*total_size);
2f77fc4b 755 if (*events == NULL) {
3c02e545 756 ret = -LTTNG_ERR_FATAL;
2f77fc4b
DG
757 goto error;
758 }
759
ab4aa612 760 extended_at = ((void *) *events) +
b4e3ceb9
PP
761 nb_event * sizeof(struct lttng_event);
762
2f77fc4b
DG
763 /* Kernel channels */
764 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
765 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
766 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
767 (*events)[i].enabled = event->enabled;
00f992f2
JG
768 (*events)[i].filter =
769 (unsigned char) !!event->filter_expression;
2f77fc4b
DG
770
771 switch (event->event->instrumentation) {
772 case LTTNG_KERNEL_TRACEPOINT:
773 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
774 break;
2f77fc4b 775 case LTTNG_KERNEL_KRETPROBE:
1896972b
DG
776 (*events)[i].type = LTTNG_EVENT_FUNCTION;
777 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
778 sizeof(struct lttng_kernel_kprobe));
779 break;
780 case LTTNG_KERNEL_KPROBE:
2f77fc4b
DG
781 (*events)[i].type = LTTNG_EVENT_PROBE;
782 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
783 sizeof(struct lttng_kernel_kprobe));
784 break;
b955b4d4
FD
785 case LTTNG_KERNEL_UPROBE:
786 (*events)[i].type = LTTNG_EVENT_USERSPACE_PROBE;
787 break;
2f77fc4b
DG
788 case LTTNG_KERNEL_FUNCTION:
789 (*events)[i].type = LTTNG_EVENT_FUNCTION;
790 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
791 sizeof(struct lttng_kernel_function));
792 break;
793 case LTTNG_KERNEL_NOOP:
794 (*events)[i].type = LTTNG_EVENT_NOOP;
795 break;
796 case LTTNG_KERNEL_SYSCALL:
797 (*events)[i].type = LTTNG_EVENT_SYSCALL;
798 break;
799 case LTTNG_KERNEL_ALL:
1ab8c2ad
FD
800 /* fall-through. */
801 default:
2f77fc4b
DG
802 assert(0);
803 break;
804 }
805 i++;
b4e3ceb9
PP
806
807 /* Append extended info */
3c02e545
FD
808 ret = append_extended_info(event->filter_expression, NULL,
809 event->userspace_probe_location, &extended_at);
810 if (ret) {
811 DBG("Error appending extended info message");
812 ret = -LTTNG_ERR_FATAL;
813 goto error;
814 }
2f77fc4b
DG
815 }
816
db906c12 817end:
2f77fc4b
DG
818 return nb_event;
819
820error:
f73fabfd
DG
821 /* Negate the error code to differentiate the size from an error */
822 return -ret;
2f77fc4b
DG
823}
824
825/*
826 * Add URI so the consumer output object. Set the correct path depending on the
827 * domain adding the default trace directory.
828 */
b178f53e
JG
829static enum lttng_error_code add_uri_to_consumer(
830 const struct ltt_session *session,
831 struct consumer_output *consumer,
832 struct lttng_uri *uri, enum lttng_domain_type domain)
2f77fc4b 833{
b178f53e
JG
834 int ret;
835 enum lttng_error_code ret_code = LTTNG_OK;
2f77fc4b
DG
836
837 assert(uri);
838
839 if (consumer == NULL) {
840 DBG("No consumer detected. Don't add URI. Stopping.");
b178f53e 841 ret_code = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
842 goto error;
843 }
844
845 switch (domain) {
846 case LTTNG_DOMAIN_KERNEL:
b178f53e
JG
847 ret = lttng_strncpy(consumer->domain_subdir,
848 DEFAULT_KERNEL_TRACE_DIR,
849 sizeof(consumer->domain_subdir));
2f77fc4b
DG
850 break;
851 case LTTNG_DOMAIN_UST:
b178f53e
JG
852 ret = lttng_strncpy(consumer->domain_subdir,
853 DEFAULT_UST_TRACE_DIR,
854 sizeof(consumer->domain_subdir));
2f77fc4b
DG
855 break;
856 default:
857 /*
b178f53e
JG
858 * This case is possible is we try to add the URI to the global
859 * tracing session consumer object which in this case there is
860 * no subdir.
2f77fc4b 861 */
b178f53e
JG
862 memset(consumer->domain_subdir, 0,
863 sizeof(consumer->domain_subdir));
864 ret = 0;
865 }
866 if (ret) {
867 ERR("Failed to initialize consumer output domain subdirectory");
868 ret_code = LTTNG_ERR_FATAL;
869 goto error;
2f77fc4b
DG
870 }
871
872 switch (uri->dtype) {
873 case LTTNG_DST_IPV4:
874 case LTTNG_DST_IPV6:
875 DBG2("Setting network URI to consumer");
876
df75acac
DG
877 if (consumer->type == CONSUMER_DST_NET) {
878 if ((uri->stype == LTTNG_STREAM_CONTROL &&
785d2d0d
DG
879 consumer->dst.net.control_isset) ||
880 (uri->stype == LTTNG_STREAM_DATA &&
881 consumer->dst.net.data_isset)) {
b178f53e 882 ret_code = LTTNG_ERR_URL_EXIST;
df75acac
DG
883 goto error;
884 }
885 } else {
b178f53e 886 memset(&consumer->dst, 0, sizeof(consumer->dst));
785d2d0d
DG
887 }
888
2f77fc4b 889 /* Set URI into consumer output object */
b178f53e 890 ret = consumer_set_network_uri(session, consumer, uri);
2f77fc4b 891 if (ret < 0) {
b178f53e 892 ret_code = -ret;
2f77fc4b
DG
893 goto error;
894 } else if (ret == 1) {
895 /*
896 * URI was the same in the consumer so we do not append the subdir
897 * again so to not duplicate output dir.
898 */
b178f53e 899 ret_code = LTTNG_OK;
2f77fc4b
DG
900 goto error;
901 }
2f77fc4b
DG
902 break;
903 case LTTNG_DST_PATH:
b178f53e
JG
904 if (*uri->dst.path != '/' || strstr(uri->dst.path, "../")) {
905 ret_code = LTTNG_ERR_INVALID;
9ac05d92
MD
906 goto error;
907 }
b178f53e
JG
908 DBG2("Setting trace directory path from URI to %s",
909 uri->dst.path);
910 memset(&consumer->dst, 0, sizeof(consumer->dst));
911
912 ret = lttng_strncpy(consumer->dst.session_root_path,
913 uri->dst.path,
914 sizeof(consumer->dst.session_root_path));
4df41cad
JG
915 if (ret) {
916 ret_code = LTTNG_ERR_FATAL;
917 goto error;
918 }
2f77fc4b
DG
919 consumer->type = CONSUMER_DST_LOCAL;
920 break;
921 }
922
b178f53e 923 ret_code = LTTNG_OK;
2f77fc4b 924error:
b178f53e 925 return ret_code;
2f77fc4b
DG
926}
927
928/*
929 * Init tracing by creating trace directory and sending fds kernel consumer.
930 */
931static int init_kernel_tracing(struct ltt_kernel_session *session)
932{
933 int ret = 0;
934 struct lttng_ht_iter iter;
935 struct consumer_socket *socket;
936
937 assert(session);
938
e7fe706f
DG
939 rcu_read_lock();
940
2f77fc4b
DG
941 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
942 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
943 socket, node.node) {
2f77fc4b 944 pthread_mutex_lock(socket->lock);
f50f23d9 945 ret = kernel_consumer_send_session(socket, session);
2f77fc4b
DG
946 pthread_mutex_unlock(socket->lock);
947 if (ret < 0) {
f73fabfd 948 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
949 goto error;
950 }
951 }
952 }
953
954error:
e7fe706f 955 rcu_read_unlock();
2f77fc4b
DG
956 return ret;
957}
958
959/*
960 * Create a socket to the relayd using the URI.
961 *
962 * On success, the relayd_sock pointer is set to the created socket.
9a654598 963 * Else, it remains untouched and an LTTng error code is returned.
2f77fc4b 964 */
9a654598 965static enum lttng_error_code create_connect_relayd(struct lttng_uri *uri,
b31610f2
JD
966 struct lttcomm_relayd_sock **relayd_sock,
967 struct consumer_output *consumer)
2f77fc4b
DG
968{
969 int ret;
9a654598 970 enum lttng_error_code status = LTTNG_OK;
6151a90f 971 struct lttcomm_relayd_sock *rsock;
2f77fc4b 972
6151a90f
JD
973 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
974 RELAYD_VERSION_COMM_MINOR);
975 if (!rsock) {
9a654598 976 status = LTTNG_ERR_FATAL;
2f77fc4b
DG
977 goto error;
978 }
979
ffe60014
DG
980 /*
981 * Connect to relayd so we can proceed with a session creation. This call
982 * can possibly block for an arbitrary amount of time to set the health
983 * state to be in poll execution.
984 */
985 health_poll_entry();
6151a90f 986 ret = relayd_connect(rsock);
ffe60014 987 health_poll_exit();
2f77fc4b
DG
988 if (ret < 0) {
989 ERR("Unable to reach lttng-relayd");
9a654598 990 status = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG
991 goto free_sock;
992 }
993
994 /* Create socket for control stream. */
995 if (uri->stype == LTTNG_STREAM_CONTROL) {
996 DBG3("Creating relayd stream socket from URI");
997
998 /* Check relayd version */
6151a90f 999 ret = relayd_version_check(rsock);
67d5aa28 1000 if (ret == LTTNG_ERR_RELAYD_VERSION_FAIL) {
9a654598 1001 status = LTTNG_ERR_RELAYD_VERSION_FAIL;
67d5aa28
JD
1002 goto close_sock;
1003 } else if (ret < 0) {
1004 ERR("Unable to reach lttng-relayd");
9a654598 1005 status = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG
1006 goto close_sock;
1007 }
b31610f2
JD
1008 consumer->relay_major_version = rsock->major;
1009 consumer->relay_minor_version = rsock->minor;
2f77fc4b
DG
1010 } else if (uri->stype == LTTNG_STREAM_DATA) {
1011 DBG3("Creating relayd data socket from URI");
1012 } else {
1013 /* Command is not valid */
1014 ERR("Relayd invalid stream type: %d", uri->stype);
9a654598 1015 status = LTTNG_ERR_INVALID;
2f77fc4b
DG
1016 goto close_sock;
1017 }
1018
6151a90f 1019 *relayd_sock = rsock;
2f77fc4b 1020
9a654598 1021 return status;
2f77fc4b
DG
1022
1023close_sock:
6151a90f
JD
1024 /* The returned value is not useful since we are on an error path. */
1025 (void) relayd_close(rsock);
2f77fc4b 1026free_sock:
6151a90f 1027 free(rsock);
2f77fc4b 1028error:
9a654598 1029 return status;
2f77fc4b
DG
1030}
1031
1032/*
1033 * Connect to the relayd using URI and send the socket to the right consumer.
43fade62
JG
1034 *
1035 * The consumer socket lock must be held by the caller.
9a654598
JG
1036 *
1037 * Returns LTTNG_OK on success or an LTTng error code on failure.
2f77fc4b 1038 */
9a654598
JG
1039static enum lttng_error_code send_consumer_relayd_socket(
1040 unsigned int session_id,
3044f922 1041 struct lttng_uri *relayd_uri,
56a37563 1042 struct consumer_output *consumer,
d3e2ba59 1043 struct consumer_socket *consumer_sock,
fb9a95c4 1044 const char *session_name, const char *hostname,
6fa5fe7c 1045 const char *base_path, int session_live_timer,
db1da059 1046 const uint64_t *current_chunk_id,
46ef2188
MD
1047 time_t session_creation_time,
1048 bool session_name_contains_creation_time)
2f77fc4b
DG
1049{
1050 int ret;
6151a90f 1051 struct lttcomm_relayd_sock *rsock = NULL;
9a654598 1052 enum lttng_error_code status;
2f77fc4b 1053
ffe60014 1054 /* Connect to relayd and make version check if uri is the control. */
9a654598
JG
1055 status = create_connect_relayd(relayd_uri, &rsock, consumer);
1056 if (status != LTTNG_OK) {
9e218353 1057 goto relayd_comm_error;
ffe60014 1058 }
6151a90f 1059 assert(rsock);
ffe60014 1060
2f77fc4b 1061 /* Set the network sequence index if not set. */
d88aee68
DG
1062 if (consumer->net_seq_index == (uint64_t) -1ULL) {
1063 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
1064 /*
1065 * Increment net_seq_idx because we are about to transfer the
1066 * new relayd socket to the consumer.
d88aee68 1067 * Assign unique key so the consumer can match streams.
2f77fc4b 1068 */
d88aee68
DG
1069 consumer->net_seq_index = ++relayd_net_seq_idx;
1070 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
1071 }
1072
2f77fc4b 1073 /* Send relayd socket to consumer. */
6151a90f 1074 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
d3e2ba59 1075 relayd_uri->stype, session_id,
6fa5fe7c
MD
1076 session_name, hostname, base_path,
1077 session_live_timer, current_chunk_id,
46ef2188 1078 session_creation_time, session_name_contains_creation_time);
2f77fc4b 1079 if (ret < 0) {
9a654598 1080 status = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
1081 goto close_sock;
1082 }
1083
c890b720
DG
1084 /* Flag that the corresponding socket was sent. */
1085 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
ffe60014 1086 consumer_sock->control_sock_sent = 1;
c890b720 1087 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
ffe60014 1088 consumer_sock->data_sock_sent = 1;
c890b720
DG
1089 }
1090
2f77fc4b
DG
1091 /*
1092 * Close socket which was dup on the consumer side. The session daemon does
1093 * NOT keep track of the relayd socket(s) once transfer to the consumer.
1094 */
1095
1096close_sock:
9a654598 1097 if (status != LTTNG_OK) {
ffe60014 1098 /*
d9078d0c
DG
1099 * The consumer output for this session should not be used anymore
1100 * since the relayd connection failed thus making any tracing or/and
1101 * streaming not usable.
ffe60014 1102 */
d9078d0c 1103 consumer->enabled = 0;
ffe60014 1104 }
9e218353
JR
1105 (void) relayd_close(rsock);
1106 free(rsock);
1107
1108relayd_comm_error:
9a654598 1109 return status;
2f77fc4b
DG
1110}
1111
1112/*
1113 * Send both relayd sockets to a specific consumer and domain. This is a
1114 * helper function to facilitate sending the information to the consumer for a
1115 * session.
43fade62
JG
1116 *
1117 * The consumer socket lock must be held by the caller.
9a654598
JG
1118 *
1119 * Returns LTTNG_OK, or an LTTng error code on failure.
2f77fc4b 1120 */
9a654598
JG
1121static enum lttng_error_code send_consumer_relayd_sockets(
1122 enum lttng_domain_type domain,
56a37563 1123 unsigned int session_id, struct consumer_output *consumer,
fb9a95c4 1124 struct consumer_socket *sock, const char *session_name,
6fa5fe7c 1125 const char *hostname, const char *base_path, int session_live_timer,
46ef2188
MD
1126 const uint64_t *current_chunk_id, time_t session_creation_time,
1127 bool session_name_contains_creation_time)
2f77fc4b 1128{
9a654598 1129 enum lttng_error_code status = LTTNG_OK;
2f77fc4b 1130
2f77fc4b 1131 assert(consumer);
6dc3064a 1132 assert(sock);
2f77fc4b 1133
2f77fc4b 1134 /* Sending control relayd socket. */
ffe60014 1135 if (!sock->control_sock_sent) {
9a654598 1136 status = send_consumer_relayd_socket(session_id,
d3e2ba59 1137 &consumer->dst.net.control, consumer, sock,
6fa5fe7c 1138 session_name, hostname, base_path, session_live_timer,
46ef2188
MD
1139 current_chunk_id, session_creation_time,
1140 session_name_contains_creation_time);
9a654598 1141 if (status != LTTNG_OK) {
c890b720
DG
1142 goto error;
1143 }
2f77fc4b
DG
1144 }
1145
1146 /* Sending data relayd socket. */
ffe60014 1147 if (!sock->data_sock_sent) {
9a654598 1148 status = send_consumer_relayd_socket(session_id,
d3e2ba59 1149 &consumer->dst.net.data, consumer, sock,
6fa5fe7c 1150 session_name, hostname, base_path, session_live_timer,
46ef2188
MD
1151 current_chunk_id, session_creation_time,
1152 session_name_contains_creation_time);
9a654598 1153 if (status != LTTNG_OK) {
c890b720
DG
1154 goto error;
1155 }
2f77fc4b
DG
1156 }
1157
2f77fc4b 1158error:
9a654598 1159 return status;
2f77fc4b
DG
1160}
1161
1162/*
1163 * Setup relayd connections for a tracing session. First creates the socket to
1164 * the relayd and send them to the right domain consumer. Consumer type MUST be
1165 * network.
1166 */
ffe60014 1167int cmd_setup_relayd(struct ltt_session *session)
2f77fc4b 1168{
f73fabfd 1169 int ret = LTTNG_OK;
2f77fc4b
DG
1170 struct ltt_ust_session *usess;
1171 struct ltt_kernel_session *ksess;
1172 struct consumer_socket *socket;
1173 struct lttng_ht_iter iter;
1e791a74 1174 LTTNG_OPTIONAL(uint64_t) current_chunk_id = {};
2f77fc4b 1175
1e791a74 1176 assert(session);
2f77fc4b
DG
1177
1178 usess = session->ust_session;
1179 ksess = session->kernel_session;
1180
785d2d0d 1181 DBG("Setting relayd for session %s", session->name);
2f77fc4b 1182
1e791a74
JG
1183 if (session->current_trace_chunk) {
1184 enum lttng_trace_chunk_status status = lttng_trace_chunk_get_id(
1185 session->current_trace_chunk, &current_chunk_id.value);
1186
1187 if (status == LTTNG_TRACE_CHUNK_STATUS_OK) {
1188 current_chunk_id.is_set = true;
1189 } else {
1190 ERR("Failed to get current trace chunk id");
1191 ret = LTTNG_ERR_UNK;
1192 goto error;
1193 }
1194 }
1195
e7fe706f
DG
1196 rcu_read_lock();
1197
2f77fc4b
DG
1198 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
1199 && usess->consumer->enabled) {
1200 /* For each consumer socket, send relayd sockets */
1201 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
1202 socket, node.node) {
2f77fc4b 1203 pthread_mutex_lock(socket->lock);
6dc3064a 1204 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
d3e2ba59
JD
1205 usess->consumer, socket,
1206 session->name, session->hostname,
6fa5fe7c 1207 session->base_path,
1e791a74 1208 session->live_timer,
db1da059 1209 current_chunk_id.is_set ? &current_chunk_id.value : NULL,
46ef2188
MD
1210 session->creation_time,
1211 session->name_contains_creation_time);
2f77fc4b 1212 pthread_mutex_unlock(socket->lock);
f73fabfd 1213 if (ret != LTTNG_OK) {
2f77fc4b
DG
1214 goto error;
1215 }
6dc3064a
DG
1216 /* Session is now ready for network streaming. */
1217 session->net_handle = 1;
2f77fc4b 1218 }
b31610f2
JD
1219 session->consumer->relay_major_version =
1220 usess->consumer->relay_major_version;
1221 session->consumer->relay_minor_version =
1222 usess->consumer->relay_minor_version;
2f77fc4b
DG
1223 }
1224
1225 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
1226 && ksess->consumer->enabled) {
1227 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
1228 socket, node.node) {
2f77fc4b 1229 pthread_mutex_lock(socket->lock);
6dc3064a 1230 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
d3e2ba59
JD
1231 ksess->consumer, socket,
1232 session->name, session->hostname,
6fa5fe7c 1233 session->base_path,
1e791a74 1234 session->live_timer,
db1da059 1235 current_chunk_id.is_set ? &current_chunk_id.value : NULL,
46ef2188
MD
1236 session->creation_time,
1237 session->name_contains_creation_time);
2f77fc4b 1238 pthread_mutex_unlock(socket->lock);
f73fabfd 1239 if (ret != LTTNG_OK) {
2f77fc4b
DG
1240 goto error;
1241 }
6dc3064a
DG
1242 /* Session is now ready for network streaming. */
1243 session->net_handle = 1;
2f77fc4b 1244 }
b31610f2
JD
1245 session->consumer->relay_major_version =
1246 ksess->consumer->relay_major_version;
1247 session->consumer->relay_minor_version =
1248 ksess->consumer->relay_minor_version;
2f77fc4b
DG
1249 }
1250
1251error:
e7fe706f 1252 rcu_read_unlock();
2f77fc4b
DG
1253 return ret;
1254}
1255
9b6c7ec5
DG
1256/*
1257 * Start a kernel session by opening all necessary streams.
1258 */
7d268848 1259static int start_kernel_session(struct ltt_kernel_session *ksess)
9b6c7ec5
DG
1260{
1261 int ret;
1262 struct ltt_kernel_channel *kchan;
1263
1264 /* Open kernel metadata */
07b86b52 1265 if (ksess->metadata == NULL && ksess->output_traces) {
9b6c7ec5
DG
1266 ret = kernel_open_metadata(ksess);
1267 if (ret < 0) {
1268 ret = LTTNG_ERR_KERN_META_FAIL;
1269 goto error;
1270 }
1271 }
1272
1273 /* Open kernel metadata stream */
07b86b52 1274 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
9b6c7ec5
DG
1275 ret = kernel_open_metadata_stream(ksess);
1276 if (ret < 0) {
1277 ERR("Kernel create metadata stream failed");
1278 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1279 goto error;
1280 }
1281 }
1282
1283 /* For each channel */
1284 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
1285 if (kchan->stream_count == 0) {
1286 ret = kernel_open_channel_stream(kchan);
1287 if (ret < 0) {
1288 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1289 goto error;
1290 }
1291 /* Update the stream global counter */
1292 ksess->stream_count_global += ret;
1293 }
1294 }
1295
1296 /* Setup kernel consumer socket and send fds to it */
1297 ret = init_kernel_tracing(ksess);
e43c41c5 1298 if (ret != 0) {
9b6c7ec5
DG
1299 ret = LTTNG_ERR_KERN_START_FAIL;
1300 goto error;
1301 }
1302
1303 /* This start the kernel tracing */
1304 ret = kernel_start_session(ksess);
1305 if (ret < 0) {
1306 ret = LTTNG_ERR_KERN_START_FAIL;
1307 goto error;
1308 }
1309
1310 /* Quiescent wait after starting trace */
7d268848 1311 kernel_wait_quiescent();
9b6c7ec5 1312
14fb1ebe 1313 ksess->active = 1;
9b6c7ec5
DG
1314
1315 ret = LTTNG_OK;
1316
1317error:
1318 return ret;
1319}
1320
2f77fc4b
DG
1321/*
1322 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1323 */
56a37563
JG
1324int cmd_disable_channel(struct ltt_session *session,
1325 enum lttng_domain_type domain, char *channel_name)
2f77fc4b
DG
1326{
1327 int ret;
1328 struct ltt_ust_session *usess;
1329
1330 usess = session->ust_session;
1331
2223c96f
DG
1332 rcu_read_lock();
1333
2f77fc4b
DG
1334 switch (domain) {
1335 case LTTNG_DOMAIN_KERNEL:
1336 {
1337 ret = channel_kernel_disable(session->kernel_session,
1338 channel_name);
f73fabfd 1339 if (ret != LTTNG_OK) {
2f77fc4b
DG
1340 goto error;
1341 }
1342
7d268848 1343 kernel_wait_quiescent();
2f77fc4b
DG
1344 break;
1345 }
1346 case LTTNG_DOMAIN_UST:
1347 {
1348 struct ltt_ust_channel *uchan;
1349 struct lttng_ht *chan_ht;
1350
1351 chan_ht = usess->domain_global.channels;
1352
1353 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
1354 if (uchan == NULL) {
f73fabfd 1355 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
1356 goto error;
1357 }
1358
7972aab2 1359 ret = channel_ust_disable(usess, uchan);
f73fabfd 1360 if (ret != LTTNG_OK) {
2f77fc4b
DG
1361 goto error;
1362 }
1363 break;
1364 }
2f77fc4b 1365 default:
f73fabfd 1366 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1367 goto error;
1368 }
1369
f73fabfd 1370 ret = LTTNG_OK;
2f77fc4b
DG
1371
1372error:
2223c96f 1373 rcu_read_unlock();
2f77fc4b
DG
1374 return ret;
1375}
1376
ccf10263
MD
1377/*
1378 * Command LTTNG_TRACK_PID processed by the client thread.
a9ad0c8f
MD
1379 *
1380 * Called with session lock held.
ccf10263 1381 */
56a37563
JG
1382int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain,
1383 int pid)
ccf10263
MD
1384{
1385 int ret;
1386
1387 rcu_read_lock();
1388
1389 switch (domain) {
1390 case LTTNG_DOMAIN_KERNEL:
1391 {
1392 struct ltt_kernel_session *ksess;
1393
1394 ksess = session->kernel_session;
1395
1396 ret = kernel_track_pid(ksess, pid);
1397 if (ret != LTTNG_OK) {
1398 goto error;
1399 }
1400
7d268848 1401 kernel_wait_quiescent();
ccf10263
MD
1402 break;
1403 }
ccf10263 1404 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
1405 {
1406 struct ltt_ust_session *usess;
1407
1408 usess = session->ust_session;
1409
1410 ret = trace_ust_track_pid(usess, pid);
1411 if (ret != LTTNG_OK) {
1412 goto error;
1413 }
1414 break;
1415 }
ccf10263
MD
1416 default:
1417 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1418 goto error;
1419 }
1420
1421 ret = LTTNG_OK;
1422
1423error:
1424 rcu_read_unlock();
1425 return ret;
1426}
1427
1428/*
1429 * Command LTTNG_UNTRACK_PID processed by the client thread.
a9ad0c8f
MD
1430 *
1431 * Called with session lock held.
ccf10263 1432 */
56a37563
JG
1433int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain,
1434 int pid)
ccf10263
MD
1435{
1436 int ret;
1437
1438 rcu_read_lock();
1439
1440 switch (domain) {
1441 case LTTNG_DOMAIN_KERNEL:
1442 {
1443 struct ltt_kernel_session *ksess;
1444
1445 ksess = session->kernel_session;
1446
1447 ret = kernel_untrack_pid(ksess, pid);
1448 if (ret != LTTNG_OK) {
1449 goto error;
1450 }
1451
7d268848 1452 kernel_wait_quiescent();
ccf10263
MD
1453 break;
1454 }
ccf10263 1455 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
1456 {
1457 struct ltt_ust_session *usess;
1458
1459 usess = session->ust_session;
1460
1461 ret = trace_ust_untrack_pid(usess, pid);
1462 if (ret != LTTNG_OK) {
1463 goto error;
1464 }
1465 break;
1466 }
ccf10263
MD
1467 default:
1468 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1469 goto error;
1470 }
1471
1472 ret = LTTNG_OK;
1473
1474error:
1475 rcu_read_unlock();
1476 return ret;
1477}
1478
2f77fc4b
DG
1479/*
1480 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1481 *
1482 * The wpipe arguments is used as a notifier for the kernel thread.
1483 */
1484int cmd_enable_channel(struct ltt_session *session,
df4f5a87 1485 const struct lttng_domain *domain, const struct lttng_channel *_attr, int wpipe)
2f77fc4b
DG
1486{
1487 int ret;
1488 struct ltt_ust_session *usess = session->ust_session;
1489 struct lttng_ht *chan_ht;
1f345e94 1490 size_t len;
df4f5a87 1491 struct lttng_channel attr;
2f77fc4b
DG
1492
1493 assert(session);
df4f5a87 1494 assert(_attr);
7972aab2 1495 assert(domain);
2f77fc4b 1496
df4f5a87
JG
1497 attr = *_attr;
1498 len = lttng_strnlen(attr.name, sizeof(attr.name));
1f345e94
PP
1499
1500 /* Validate channel name */
df4f5a87
JG
1501 if (attr.name[0] == '.' ||
1502 memchr(attr.name, '/', len) != NULL) {
1f345e94
PP
1503 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1504 goto end;
1505 }
1506
df4f5a87 1507 DBG("Enabling channel %s for session %s", attr.name, session->name);
2f77fc4b 1508
03b4fdcf
DG
1509 rcu_read_lock();
1510
ecc48a90
JD
1511 /*
1512 * Don't try to enable a channel if the session has been started at
1513 * some point in time before. The tracer does not allow it.
1514 */
8382cf6f 1515 if (session->has_been_started) {
ecc48a90
JD
1516 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1517 goto error;
1518 }
1519
1520 /*
1521 * If the session is a live session, remove the switch timer, the
1522 * live timer does the same thing but sends also synchronisation
1523 * beacons for inactive streams.
1524 */
1525 if (session->live_timer > 0) {
df4f5a87
JG
1526 attr.attr.live_timer_interval = session->live_timer;
1527 attr.attr.switch_timer_interval = 0;
ecc48a90
JD
1528 }
1529
6e21424e
JR
1530 /* Check for feature support */
1531 switch (domain->type) {
1532 case LTTNG_DOMAIN_KERNEL:
1533 {
7d268848 1534 if (kernel_supports_ring_buffer_snapshot_sample_positions() != 1) {
6e21424e
JR
1535 /* Sampling position of buffer is not supported */
1536 WARN("Kernel tracer does not support buffer monitoring. "
1537 "Setting the monitor interval timer to 0 "
1538 "(disabled) for channel '%s' of session '%s'",
df4f5a87
JG
1539 attr.name, session->name);
1540 lttng_channel_set_monitor_timer_interval(&attr, 0);
6e21424e
JR
1541 }
1542 break;
1543 }
1544 case LTTNG_DOMAIN_UST:
f28f9e44 1545 break;
6e21424e
JR
1546 case LTTNG_DOMAIN_JUL:
1547 case LTTNG_DOMAIN_LOG4J:
1548 case LTTNG_DOMAIN_PYTHON:
f28f9e44
JG
1549 if (!agent_tracing_is_enabled()) {
1550 DBG("Attempted to enable a channel in an agent domain but the agent thread is not running");
1551 ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
1552 goto error;
1553 }
6e21424e
JR
1554 break;
1555 default:
1556 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1557 goto error;
1558 }
1559
7972aab2 1560 switch (domain->type) {
2f77fc4b
DG
1561 case LTTNG_DOMAIN_KERNEL:
1562 {
1563 struct ltt_kernel_channel *kchan;
1564
df4f5a87 1565 kchan = trace_kernel_get_channel_by_name(attr.name,
2f77fc4b
DG
1566 session->kernel_session);
1567 if (kchan == NULL) {
54213acc
JG
1568 if (session->snapshot.nb_output > 0 ||
1569 session->snapshot_mode) {
1570 /* Enforce mmap output for snapshot sessions. */
df4f5a87 1571 attr.attr.output = LTTNG_EVENT_MMAP;
54213acc 1572 }
df4f5a87
JG
1573 ret = channel_kernel_create(session->kernel_session, &attr, wpipe);
1574 if (attr.name[0] != '\0') {
85076754
MD
1575 session->kernel_session->has_non_default_channel = 1;
1576 }
2f77fc4b
DG
1577 } else {
1578 ret = channel_kernel_enable(session->kernel_session, kchan);
1579 }
1580
f73fabfd 1581 if (ret != LTTNG_OK) {
2f77fc4b
DG
1582 goto error;
1583 }
1584
7d268848 1585 kernel_wait_quiescent();
2f77fc4b
DG
1586 break;
1587 }
1588 case LTTNG_DOMAIN_UST:
9232818f
JG
1589 case LTTNG_DOMAIN_JUL:
1590 case LTTNG_DOMAIN_LOG4J:
1591 case LTTNG_DOMAIN_PYTHON:
2f77fc4b
DG
1592 {
1593 struct ltt_ust_channel *uchan;
1594
9232818f
JG
1595 /*
1596 * FIXME
1597 *
1598 * Current agent implementation limitations force us to allow
1599 * only one channel at once in "agent" subdomains. Each
1600 * subdomain has a default channel name which must be strictly
1601 * adhered to.
1602 */
1603 if (domain->type == LTTNG_DOMAIN_JUL) {
df4f5a87 1604 if (strncmp(attr.name, DEFAULT_JUL_CHANNEL_NAME,
9232818f
JG
1605 LTTNG_SYMBOL_NAME_LEN)) {
1606 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1607 goto error;
1608 }
1609 } else if (domain->type == LTTNG_DOMAIN_LOG4J) {
df4f5a87 1610 if (strncmp(attr.name, DEFAULT_LOG4J_CHANNEL_NAME,
9232818f
JG
1611 LTTNG_SYMBOL_NAME_LEN)) {
1612 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1613 goto error;
1614 }
1615 } else if (domain->type == LTTNG_DOMAIN_PYTHON) {
df4f5a87 1616 if (strncmp(attr.name, DEFAULT_PYTHON_CHANNEL_NAME,
9232818f
JG
1617 LTTNG_SYMBOL_NAME_LEN)) {
1618 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1619 goto error;
1620 }
1621 }
1622
2f77fc4b
DG
1623 chan_ht = usess->domain_global.channels;
1624
df4f5a87 1625 uchan = trace_ust_find_channel_by_name(chan_ht, attr.name);
2f77fc4b 1626 if (uchan == NULL) {
df4f5a87
JG
1627 ret = channel_ust_create(usess, &attr, domain->buf_type);
1628 if (attr.name[0] != '\0') {
85076754
MD
1629 usess->has_non_default_channel = 1;
1630 }
2f77fc4b 1631 } else {
7972aab2 1632 ret = channel_ust_enable(usess, uchan);
2f77fc4b
DG
1633 }
1634 break;
1635 }
2f77fc4b 1636 default:
f73fabfd 1637 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1638 goto error;
1639 }
1640
df4f5a87 1641 if (ret == LTTNG_OK && attr.attr.output != LTTNG_EVENT_MMAP) {
54213acc
JG
1642 session->has_non_mmap_channel = true;
1643 }
2f77fc4b 1644error:
2223c96f 1645 rcu_read_unlock();
1f345e94 1646end:
2f77fc4b
DG
1647 return ret;
1648}
1649
2f77fc4b
DG
1650/*
1651 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1652 */
56a37563 1653int cmd_disable_event(struct ltt_session *session,
df4f5a87
JG
1654 enum lttng_domain_type domain, const char *channel_name,
1655 const struct lttng_event *event)
2f77fc4b
DG
1656{
1657 int ret;
df4f5a87 1658 const char *event_name;
6e911cad 1659
18a720cd
MD
1660 DBG("Disable event command for event \'%s\'", event->name);
1661
6e911cad
MD
1662 event_name = event->name;
1663
9b7431cf
JG
1664 /* Error out on unhandled search criteria */
1665 if (event->loglevel_type || event->loglevel != -1 || event->enabled
6e911cad 1666 || event->pid || event->filter || event->exclusion) {
7076b56e
JG
1667 ret = LTTNG_ERR_UNK;
1668 goto error;
6e911cad 1669 }
2f77fc4b 1670
2223c96f
DG
1671 rcu_read_lock();
1672
2f77fc4b
DG
1673 switch (domain) {
1674 case LTTNG_DOMAIN_KERNEL:
1675 {
1676 struct ltt_kernel_channel *kchan;
1677 struct ltt_kernel_session *ksess;
1678
1679 ksess = session->kernel_session;
1680
85076754
MD
1681 /*
1682 * If a non-default channel has been created in the
1683 * session, explicitely require that -c chan_name needs
1684 * to be provided.
1685 */
1686 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1687 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1688 goto error_unlock;
85076754
MD
1689 }
1690
2f77fc4b
DG
1691 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1692 if (kchan == NULL) {
f73fabfd 1693 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
7076b56e 1694 goto error_unlock;
2f77fc4b
DG
1695 }
1696
6e911cad
MD
1697 switch (event->type) {
1698 case LTTNG_EVENT_ALL:
9550ee81 1699 case LTTNG_EVENT_TRACEPOINT:
d0ae4ea8 1700 case LTTNG_EVENT_SYSCALL:
9550ee81
JR
1701 case LTTNG_EVENT_PROBE:
1702 case LTTNG_EVENT_FUNCTION:
1703 case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */
1704 if (event_name[0] == '\0') {
1705 ret = event_kernel_disable_event(kchan,
1706 NULL, event->type);
29c62722 1707 } else {
d0ae4ea8 1708 ret = event_kernel_disable_event(kchan,
9550ee81 1709 event_name, event->type);
29c62722 1710 }
6e911cad 1711 if (ret != LTTNG_OK) {
7076b56e 1712 goto error_unlock;
6e911cad
MD
1713 }
1714 break;
6e911cad
MD
1715 default:
1716 ret = LTTNG_ERR_UNK;
7076b56e 1717 goto error_unlock;
2f77fc4b
DG
1718 }
1719
7d268848 1720 kernel_wait_quiescent();
2f77fc4b
DG
1721 break;
1722 }
1723 case LTTNG_DOMAIN_UST:
1724 {
1725 struct ltt_ust_channel *uchan;
1726 struct ltt_ust_session *usess;
1727
1728 usess = session->ust_session;
1729
7076b56e
JG
1730 if (validate_ust_event_name(event_name)) {
1731 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1732 goto error_unlock;
1733 }
1734
85076754
MD
1735 /*
1736 * If a non-default channel has been created in the
9550ee81 1737 * session, explicitly require that -c chan_name needs
85076754
MD
1738 * to be provided.
1739 */
1740 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1741 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1742 goto error_unlock;
85076754
MD
1743 }
1744
2f77fc4b
DG
1745 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1746 channel_name);
1747 if (uchan == NULL) {
f73fabfd 1748 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
7076b56e 1749 goto error_unlock;
2f77fc4b
DG
1750 }
1751
6e911cad
MD
1752 switch (event->type) {
1753 case LTTNG_EVENT_ALL:
b3639870
JR
1754 /*
1755 * An empty event name means that everything
1756 * should be disabled.
1757 */
1758 if (event->name[0] == '\0') {
1759 ret = event_ust_disable_all_tracepoints(usess, uchan);
77d536b2
JR
1760 } else {
1761 ret = event_ust_disable_tracepoint(usess, uchan,
1762 event_name);
1763 }
6e911cad 1764 if (ret != LTTNG_OK) {
7076b56e 1765 goto error_unlock;
6e911cad
MD
1766 }
1767 break;
1768 default:
1769 ret = LTTNG_ERR_UNK;
7076b56e 1770 goto error_unlock;
2f77fc4b
DG
1771 }
1772
1773 DBG3("Disable UST event %s in channel %s completed", event_name,
1774 channel_name);
1775 break;
1776 }
5cdb6027 1777 case LTTNG_DOMAIN_LOG4J:
f20baf8e 1778 case LTTNG_DOMAIN_JUL:
0e115563 1779 case LTTNG_DOMAIN_PYTHON:
f20baf8e 1780 {
fefd409b 1781 struct agent *agt;
f20baf8e
DG
1782 struct ltt_ust_session *usess = session->ust_session;
1783
1784 assert(usess);
1785
6e911cad
MD
1786 switch (event->type) {
1787 case LTTNG_EVENT_ALL:
1788 break;
1789 default:
1790 ret = LTTNG_ERR_UNK;
7076b56e 1791 goto error_unlock;
6e911cad
MD
1792 }
1793
5cdb6027 1794 agt = trace_ust_find_agent(usess, domain);
fefd409b
DG
1795 if (!agt) {
1796 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
7076b56e 1797 goto error_unlock;
fefd409b 1798 }
b3639870
JR
1799 /*
1800 * An empty event name means that everything
1801 * should be disabled.
1802 */
1803 if (event->name[0] == '\0') {
18a720cd
MD
1804 ret = event_agent_disable_all(usess, agt);
1805 } else {
1806 ret = event_agent_disable(usess, agt, event_name);
1807 }
f20baf8e 1808 if (ret != LTTNG_OK) {
7076b56e 1809 goto error_unlock;
f20baf8e
DG
1810 }
1811
1812 break;
1813 }
2f77fc4b 1814 default:
f73fabfd 1815 ret = LTTNG_ERR_UND;
7076b56e 1816 goto error_unlock;
2f77fc4b
DG
1817 }
1818
f73fabfd 1819 ret = LTTNG_OK;
2f77fc4b 1820
7076b56e 1821error_unlock:
2223c96f 1822 rcu_read_unlock();
7076b56e 1823error:
2f77fc4b
DG
1824 return ret;
1825}
1826
2f77fc4b
DG
1827/*
1828 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1829 */
56a37563 1830int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain,
df4f5a87 1831 char *channel_name, const struct lttng_event_context *ctx, int kwpipe)
2f77fc4b 1832{
d5979e4a 1833 int ret, chan_kern_created = 0, chan_ust_created = 0;
bdf64013
JG
1834 char *app_ctx_provider_name = NULL, *app_ctx_name = NULL;
1835
9a699f7b
JR
1836 /*
1837 * Don't try to add a context if the session has been started at
1838 * some point in time before. The tracer does not allow it and would
1839 * result in a corrupted trace.
1840 */
1841 if (session->has_been_started) {
1842 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1843 goto end;
1844 }
1845
bdf64013
JG
1846 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
1847 app_ctx_provider_name = ctx->u.app_ctx.provider_name;
1848 app_ctx_name = ctx->u.app_ctx.ctx_name;
1849 }
2f77fc4b
DG
1850
1851 switch (domain) {
1852 case LTTNG_DOMAIN_KERNEL:
979e618e
DG
1853 assert(session->kernel_session);
1854
1855 if (session->kernel_session->channel_count == 0) {
1856 /* Create default channel */
1857 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1858 if (ret != LTTNG_OK) {
1859 goto error;
1860 }
d5979e4a 1861 chan_kern_created = 1;
979e618e 1862 }
2f77fc4b 1863 /* Add kernel context to kernel tracer */
601d5acf 1864 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
f73fabfd 1865 if (ret != LTTNG_OK) {
2f77fc4b
DG
1866 goto error;
1867 }
1868 break;
bdf64013
JG
1869 case LTTNG_DOMAIN_JUL:
1870 case LTTNG_DOMAIN_LOG4J:
1871 {
1872 /*
1873 * Validate channel name.
1874 * If no channel name is given and the domain is JUL or LOG4J,
1875 * set it to the appropriate domain-specific channel name. If
1876 * a name is provided but does not match the expexted channel
1877 * name, return an error.
1878 */
1879 if (domain == LTTNG_DOMAIN_JUL && *channel_name &&
1880 strcmp(channel_name,
1881 DEFAULT_JUL_CHANNEL_NAME)) {
1882 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1883 goto error;
1884 } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name &&
1885 strcmp(channel_name,
1886 DEFAULT_LOG4J_CHANNEL_NAME)) {
1887 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1888 goto error;
1889 }
a93b3916 1890 /* break is _not_ missing here. */
bdf64013 1891 }
2f77fc4b
DG
1892 case LTTNG_DOMAIN_UST:
1893 {
1894 struct ltt_ust_session *usess = session->ust_session;
85076754
MD
1895 unsigned int chan_count;
1896
2f77fc4b
DG
1897 assert(usess);
1898
85076754 1899 chan_count = lttng_ht_get_count(usess->domain_global.channels);
979e618e
DG
1900 if (chan_count == 0) {
1901 struct lttng_channel *attr;
1902 /* Create default channel */
0a9c6494 1903 attr = channel_new_default_attr(domain, usess->buffer_type);
979e618e
DG
1904 if (attr == NULL) {
1905 ret = LTTNG_ERR_FATAL;
1906 goto error;
1907 }
1908
7972aab2 1909 ret = channel_ust_create(usess, attr, usess->buffer_type);
979e618e
DG
1910 if (ret != LTTNG_OK) {
1911 free(attr);
1912 goto error;
1913 }
cf0bcb51 1914 channel_attr_destroy(attr);
d5979e4a 1915 chan_ust_created = 1;
979e618e
DG
1916 }
1917
601d5acf 1918 ret = context_ust_add(usess, domain, ctx, channel_name);
bdf64013
JG
1919 free(app_ctx_provider_name);
1920 free(app_ctx_name);
1921 app_ctx_name = NULL;
1922 app_ctx_provider_name = NULL;
f73fabfd 1923 if (ret != LTTNG_OK) {
2f77fc4b
DG
1924 goto error;
1925 }
1926 break;
1927 }
2f77fc4b 1928 default:
f73fabfd 1929 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1930 goto error;
1931 }
1932
bdf64013
JG
1933 ret = LTTNG_OK;
1934 goto end;
2f77fc4b
DG
1935
1936error:
d5979e4a
DG
1937 if (chan_kern_created) {
1938 struct ltt_kernel_channel *kchan =
1939 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1940 session->kernel_session);
1941 /* Created previously, this should NOT fail. */
1942 assert(kchan);
1943 kernel_destroy_channel(kchan);
1944 }
1945
1946 if (chan_ust_created) {
1947 struct ltt_ust_channel *uchan =
1948 trace_ust_find_channel_by_name(
1949 session->ust_session->domain_global.channels,
1950 DEFAULT_CHANNEL_NAME);
1951 /* Created previously, this should NOT fail. */
1952 assert(uchan);
1953 /* Remove from the channel list of the session. */
1954 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1955 uchan);
1956 trace_ust_destroy_channel(uchan);
1957 }
bdf64013
JG
1958end:
1959 free(app_ctx_provider_name);
1960 free(app_ctx_name);
2f77fc4b
DG
1961 return ret;
1962}
1963
dac8e046
JG
1964static inline bool name_starts_with(const char *name, const char *prefix)
1965{
1966 const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
1967
1968 return !strncmp(name, prefix, max_cmp_len);
1969}
1970
1971/* Perform userspace-specific event name validation */
1972static int validate_ust_event_name(const char *name)
1973{
1974 int ret = 0;
1975
1976 if (!name) {
1977 ret = -1;
1978 goto end;
1979 }
1980
1981 /*
1982 * Check name against all internal UST event component namespaces used
1983 * by the agents.
1984 */
1985 if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) ||
1986 name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) ||
1987 name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) {
1988 ret = -1;
1989 }
1990
1991end:
1992 return ret;
1993}
88f06f15 1994
2f77fc4b 1995/*
88f06f15
JG
1996 * Internal version of cmd_enable_event() with a supplemental
1997 * "internal_event" flag which is used to enable internal events which should
1998 * be hidden from clients. Such events are used in the agent implementation to
1999 * enable the events through which all "agent" events are funeled.
2f77fc4b 2000 */
88f06f15 2001static int _cmd_enable_event(struct ltt_session *session,
df4f5a87 2002 const struct lttng_domain *domain,
025faf73 2003 char *channel_name, struct lttng_event *event,
6b453b5e 2004 char *filter_expression,
db8f1377
JI
2005 struct lttng_filter_bytecode *filter,
2006 struct lttng_event_exclusion *exclusion,
88f06f15 2007 int wpipe, bool internal_event)
2f77fc4b 2008{
9f449915 2009 int ret = 0, channel_created = 0;
cfedea03 2010 struct lttng_channel *attr = NULL;
2f77fc4b
DG
2011
2012 assert(session);
2013 assert(event);
2014 assert(channel_name);
2015
2a385866
JG
2016 /* If we have a filter, we must have its filter expression */
2017 assert(!(!!filter_expression ^ !!filter));
2018
9f449915
PP
2019 /* Normalize event name as a globbing pattern */
2020 strutils_normalize_star_glob_pattern(event->name);
18a720cd 2021
9f449915
PP
2022 /* Normalize exclusion names as globbing patterns */
2023 if (exclusion) {
2024 size_t i;
f5ac4bd7 2025
9f449915
PP
2026 for (i = 0; i < exclusion->count; i++) {
2027 char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i);
2028
2029 strutils_normalize_star_glob_pattern(name);
2030 }
930a2e99
JG
2031 }
2032
9f449915
PP
2033 DBG("Enable event command for event \'%s\'", event->name);
2034
2035 rcu_read_lock();
2036
7972aab2 2037 switch (domain->type) {
2f77fc4b
DG
2038 case LTTNG_DOMAIN_KERNEL:
2039 {
2040 struct ltt_kernel_channel *kchan;
2041
85076754
MD
2042 /*
2043 * If a non-default channel has been created in the
2044 * session, explicitely require that -c chan_name needs
2045 * to be provided.
2046 */
2047 if (session->kernel_session->has_non_default_channel
2048 && channel_name[0] == '\0') {
2049 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
2050 goto error;
2051 }
2052
2f77fc4b
DG
2053 kchan = trace_kernel_get_channel_by_name(channel_name,
2054 session->kernel_session);
2055 if (kchan == NULL) {
0a9c6494
DG
2056 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
2057 LTTNG_BUFFER_GLOBAL);
2f77fc4b 2058 if (attr == NULL) {
f73fabfd 2059 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2060 goto error;
2061 }
04c17253
MD
2062 if (lttng_strncpy(attr->name, channel_name,
2063 sizeof(attr->name))) {
2064 ret = LTTNG_ERR_INVALID;
04c17253
MD
2065 goto error;
2066 }
2f77fc4b
DG
2067
2068 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 2069 if (ret != LTTNG_OK) {
2f77fc4b
DG
2070 goto error;
2071 }
e5f5db7f 2072 channel_created = 1;
2f77fc4b
DG
2073 }
2074
2075 /* Get the newly created kernel channel pointer */
2076 kchan = trace_kernel_get_channel_by_name(channel_name,
2077 session->kernel_session);
2078 if (kchan == NULL) {
2079 /* This sould not happen... */
f73fabfd 2080 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2081 goto error;
2082 }
2083
6e911cad
MD
2084 switch (event->type) {
2085 case LTTNG_EVENT_ALL:
29c62722 2086 {
00a62084
MD
2087 char *filter_expression_a = NULL;
2088 struct lttng_filter_bytecode *filter_a = NULL;
2089
2090 /*
2091 * We need to duplicate filter_expression and filter,
2092 * because ownership is passed to first enable
2093 * event.
2094 */
2095 if (filter_expression) {
2096 filter_expression_a = strdup(filter_expression);
2097 if (!filter_expression_a) {
2098 ret = LTTNG_ERR_FATAL;
2099 goto error;
2100 }
2101 }
2102 if (filter) {
2103 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
2104 if (!filter_a) {
2105 free(filter_expression_a);
2106 ret = LTTNG_ERR_FATAL;
2107 goto error;
2108 }
2109 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
2110 }
29c62722 2111 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
00a62084
MD
2112 ret = event_kernel_enable_event(kchan, event,
2113 filter_expression, filter);
a969e101
MD
2114 /* We have passed ownership */
2115 filter_expression = NULL;
2116 filter = NULL;
29c62722
MD
2117 if (ret != LTTNG_OK) {
2118 if (channel_created) {
2119 /* Let's not leak a useless channel. */
2120 kernel_destroy_channel(kchan);
2121 }
00a62084
MD
2122 free(filter_expression_a);
2123 free(filter_a);
29c62722
MD
2124 goto error;
2125 }
2126 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
00a62084
MD
2127 ret = event_kernel_enable_event(kchan, event,
2128 filter_expression_a, filter_a);
60d21fa2
AB
2129 /* We have passed ownership */
2130 filter_expression_a = NULL;
2131 filter_a = NULL;
29c62722
MD
2132 if (ret != LTTNG_OK) {
2133 goto error;
2134 }
2135 break;
2136 }
6e6ef3d7 2137 case LTTNG_EVENT_PROBE:
dcabc190 2138 case LTTNG_EVENT_USERSPACE_PROBE:
6e6ef3d7
DG
2139 case LTTNG_EVENT_FUNCTION:
2140 case LTTNG_EVENT_FUNCTION_ENTRY:
6e911cad 2141 case LTTNG_EVENT_TRACEPOINT:
00a62084
MD
2142 ret = event_kernel_enable_event(kchan, event,
2143 filter_expression, filter);
a969e101
MD
2144 /* We have passed ownership */
2145 filter_expression = NULL;
2146 filter = NULL;
6e911cad
MD
2147 if (ret != LTTNG_OK) {
2148 if (channel_created) {
2149 /* Let's not leak a useless channel. */
2150 kernel_destroy_channel(kchan);
2151 }
2152 goto error;
e5f5db7f 2153 }
6e911cad
MD
2154 break;
2155 case LTTNG_EVENT_SYSCALL:
00a62084
MD
2156 ret = event_kernel_enable_event(kchan, event,
2157 filter_expression, filter);
a969e101
MD
2158 /* We have passed ownership */
2159 filter_expression = NULL;
2160 filter = NULL;
e2b957af
MD
2161 if (ret != LTTNG_OK) {
2162 goto error;
2163 }
6e911cad
MD
2164 break;
2165 default:
2166 ret = LTTNG_ERR_UNK;
2f77fc4b
DG
2167 goto error;
2168 }
2169
7d268848 2170 kernel_wait_quiescent();
2f77fc4b
DG
2171 break;
2172 }
2173 case LTTNG_DOMAIN_UST:
2174 {
2175 struct ltt_ust_channel *uchan;
2176 struct ltt_ust_session *usess = session->ust_session;
2177
2178 assert(usess);
2179
85076754
MD
2180 /*
2181 * If a non-default channel has been created in the
2182 * session, explicitely require that -c chan_name needs
2183 * to be provided.
2184 */
2185 if (usess->has_non_default_channel && channel_name[0] == '\0') {
2186 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
2187 goto error;
2188 }
2189
2f77fc4b
DG
2190 /* Get channel from global UST domain */
2191 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2192 channel_name);
2193 if (uchan == NULL) {
2194 /* Create default channel */
0a9c6494
DG
2195 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
2196 usess->buffer_type);
2f77fc4b 2197 if (attr == NULL) {
f73fabfd 2198 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2199 goto error;
2200 }
04c17253
MD
2201 if (lttng_strncpy(attr->name, channel_name,
2202 sizeof(attr->name))) {
2203 ret = LTTNG_ERR_INVALID;
04c17253
MD
2204 goto error;
2205 }
2f77fc4b
DG
2206
2207 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 2208 if (ret != LTTNG_OK) {
2f77fc4b
DG
2209 goto error;
2210 }
2f77fc4b
DG
2211
2212 /* Get the newly created channel reference back */
2213 uchan = trace_ust_find_channel_by_name(
2214 usess->domain_global.channels, channel_name);
2215 assert(uchan);
2216 }
2217
141feb8c
JG
2218 if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) {
2219 /*
2220 * Don't allow users to add UST events to channels which
2221 * are assigned to a userspace subdomain (JUL, Log4J,
2222 * Python, etc.).
2223 */
2224 ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN;
2225 goto error;
2226 }
2227
dac8e046
JG
2228 if (!internal_event) {
2229 /*
2230 * Ensure the event name is not reserved for internal
2231 * use.
2232 */
2233 ret = validate_ust_event_name(event->name);
2234 if (ret) {
2235 WARN("Userspace event name %s failed validation.",
bbcab087 2236 event->name);
dac8e046
JG
2237 ret = LTTNG_ERR_INVALID_EVENT_NAME;
2238 goto error;
2239 }
2240 }
2241
2f77fc4b 2242 /* At this point, the session and channel exist on the tracer */
6b453b5e 2243 ret = event_ust_enable_tracepoint(usess, uchan, event,
88f06f15
JG
2244 filter_expression, filter, exclusion,
2245 internal_event);
49d21f93
MD
2246 /* We have passed ownership */
2247 filter_expression = NULL;
2248 filter = NULL;
2249 exclusion = NULL;
94382e15
JG
2250 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2251 goto already_enabled;
2252 } else if (ret != LTTNG_OK) {
2f77fc4b
DG
2253 goto error;
2254 }
2255 break;
2256 }
5cdb6027 2257 case LTTNG_DOMAIN_LOG4J:
f20baf8e 2258 case LTTNG_DOMAIN_JUL:
0e115563 2259 case LTTNG_DOMAIN_PYTHON:
f20baf8e 2260 {
da6c3a50 2261 const char *default_event_name, *default_chan_name;
fefd409b 2262 struct agent *agt;
f20baf8e
DG
2263 struct lttng_event uevent;
2264 struct lttng_domain tmp_dom;
2265 struct ltt_ust_session *usess = session->ust_session;
2266
2267 assert(usess);
2268
f28f9e44
JG
2269 if (!agent_tracing_is_enabled()) {
2270 DBG("Attempted to enable an event in an agent domain but the agent thread is not running");
2271 ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
2272 goto error;
2273 }
2274
5cdb6027 2275 agt = trace_ust_find_agent(usess, domain->type);
fefd409b 2276 if (!agt) {
5cdb6027 2277 agt = agent_create(domain->type);
fefd409b 2278 if (!agt) {
e5b3c48c 2279 ret = LTTNG_ERR_NOMEM;
fefd409b
DG
2280 goto error;
2281 }
2282 agent_add(agt, usess->agents);
2283 }
2284
022d91ba 2285 /* Create the default tracepoint. */
996de3c7 2286 memset(&uevent, 0, sizeof(uevent));
f20baf8e
DG
2287 uevent.type = LTTNG_EVENT_TRACEPOINT;
2288 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
51755dc8
JG
2289 default_event_name = event_get_default_agent_ust_name(
2290 domain->type);
da6c3a50 2291 if (!default_event_name) {
e5b3c48c 2292 ret = LTTNG_ERR_FATAL;
da6c3a50 2293 goto error;
f43f95a9 2294 }
da6c3a50 2295 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
f20baf8e
DG
2296 uevent.name[sizeof(uevent.name) - 1] = '\0';
2297
2298 /*
2299 * The domain type is changed because we are about to enable the
2300 * default channel and event for the JUL domain that are hardcoded.
2301 * This happens in the UST domain.
2302 */
2303 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
2304 tmp_dom.type = LTTNG_DOMAIN_UST;
2305
0e115563
DG
2306 switch (domain->type) {
2307 case LTTNG_DOMAIN_LOG4J:
da6c3a50 2308 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
0e115563
DG
2309 break;
2310 case LTTNG_DOMAIN_JUL:
da6c3a50 2311 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
0e115563
DG
2312 break;
2313 case LTTNG_DOMAIN_PYTHON:
2314 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
2315 break;
2316 default:
e98a44b0 2317 /* The switch/case we are in makes this impossible */
0e115563 2318 assert(0);
da6c3a50
DG
2319 }
2320
971da06a 2321 {
8404118c 2322 char *filter_expression_copy = NULL;
51755dc8 2323 struct lttng_filter_bytecode *filter_copy = NULL;
971da06a
JG
2324
2325 if (filter) {
51755dc8
JG
2326 const size_t filter_size = sizeof(
2327 struct lttng_filter_bytecode)
2328 + filter->len;
2329
2330 filter_copy = zmalloc(filter_size);
971da06a 2331 if (!filter_copy) {
018096a4 2332 ret = LTTNG_ERR_NOMEM;
b742e3e2 2333 goto error;
971da06a 2334 }
51755dc8 2335 memcpy(filter_copy, filter, filter_size);
971da06a 2336
8404118c
JG
2337 filter_expression_copy =
2338 strdup(filter_expression);
2339 if (!filter_expression) {
2340 ret = LTTNG_ERR_NOMEM;
51755dc8
JG
2341 }
2342
2343 if (!filter_expression_copy || !filter_copy) {
2344 free(filter_expression_copy);
2345 free(filter_copy);
2346 goto error;
8404118c 2347 }
971da06a
JG
2348 }
2349
88f06f15 2350 ret = cmd_enable_event_internal(session, &tmp_dom,
971da06a 2351 (char *) default_chan_name,
8404118c
JG
2352 &uevent, filter_expression_copy,
2353 filter_copy, NULL, wpipe);
971da06a
JG
2354 }
2355
94382e15
JG
2356 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2357 goto already_enabled;
2358 } else if (ret != LTTNG_OK) {
f20baf8e
DG
2359 goto error;
2360 }
2361
2362 /* The wild card * means that everything should be enabled. */
2363 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
8404118c
JG
2364 ret = event_agent_enable_all(usess, agt, event, filter,
2365 filter_expression);
f20baf8e 2366 } else {
8404118c
JG
2367 ret = event_agent_enable(usess, agt, event, filter,
2368 filter_expression);
f20baf8e 2369 }
51755dc8
JG
2370 filter = NULL;
2371 filter_expression = NULL;
f20baf8e
DG
2372 if (ret != LTTNG_OK) {
2373 goto error;
2374 }
2375
2376 break;
2377 }
2f77fc4b 2378 default:
f73fabfd 2379 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2380 goto error;
2381 }
2382
f73fabfd 2383 ret = LTTNG_OK;
2f77fc4b 2384
94382e15 2385already_enabled:
2f77fc4b 2386error:
49d21f93
MD
2387 free(filter_expression);
2388 free(filter);
2389 free(exclusion);
cf0bcb51 2390 channel_attr_destroy(attr);
2223c96f 2391 rcu_read_unlock();
2f77fc4b
DG
2392 return ret;
2393}
2394
88f06f15
JG
2395/*
2396 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2397 * We own filter, exclusion, and filter_expression.
2398 */
df4f5a87
JG
2399int cmd_enable_event(struct ltt_session *session,
2400 const struct lttng_domain *domain,
88f06f15
JG
2401 char *channel_name, struct lttng_event *event,
2402 char *filter_expression,
2403 struct lttng_filter_bytecode *filter,
2404 struct lttng_event_exclusion *exclusion,
2405 int wpipe)
2406{
2407 return _cmd_enable_event(session, domain, channel_name, event,
2408 filter_expression, filter, exclusion, wpipe, false);
2409}
2410
2411/*
2412 * Enable an event which is internal to LTTng. An internal should
2413 * never be made visible to clients and are immune to checks such as
2414 * reserved names.
2415 */
2416static int cmd_enable_event_internal(struct ltt_session *session,
df4f5a87 2417 const struct lttng_domain *domain,
88f06f15
JG
2418 char *channel_name, struct lttng_event *event,
2419 char *filter_expression,
2420 struct lttng_filter_bytecode *filter,
2421 struct lttng_event_exclusion *exclusion,
2422 int wpipe)
2423{
2424 return _cmd_enable_event(session, domain, channel_name, event,
2425 filter_expression, filter, exclusion, wpipe, true);
2426}
2427
2f77fc4b
DG
2428/*
2429 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2430 */
56a37563
JG
2431ssize_t cmd_list_tracepoints(enum lttng_domain_type domain,
2432 struct lttng_event **events)
2f77fc4b
DG
2433{
2434 int ret;
2435 ssize_t nb_events = 0;
2436
2437 switch (domain) {
2438 case LTTNG_DOMAIN_KERNEL:
7d268848 2439 nb_events = kernel_list_events(events);
2f77fc4b 2440 if (nb_events < 0) {
f73fabfd 2441 ret = LTTNG_ERR_KERN_LIST_FAIL;
2f77fc4b
DG
2442 goto error;
2443 }
2444 break;
2445 case LTTNG_DOMAIN_UST:
2446 nb_events = ust_app_list_events(events);
2447 if (nb_events < 0) {
f73fabfd 2448 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
2449 goto error;
2450 }
2451 break;
5cdb6027 2452 case LTTNG_DOMAIN_LOG4J:
3c6a091f 2453 case LTTNG_DOMAIN_JUL:
0e115563 2454 case LTTNG_DOMAIN_PYTHON:
f60140a1 2455 nb_events = agent_list_events(events, domain);
3c6a091f
DG
2456 if (nb_events < 0) {
2457 ret = LTTNG_ERR_UST_LIST_FAIL;
2458 goto error;
2459 }
2460 break;
2f77fc4b 2461 default:
f73fabfd 2462 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2463 goto error;
2464 }
2465
2466 return nb_events;
2467
2468error:
2469 /* Return negative value to differentiate return code */
2470 return -ret;
2471}
2472
2473/*
2474 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2475 */
56a37563 2476ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain,
2f77fc4b
DG
2477 struct lttng_event_field **fields)
2478{
2479 int ret;
2480 ssize_t nb_fields = 0;
2481
2482 switch (domain) {
2483 case LTTNG_DOMAIN_UST:
2484 nb_fields = ust_app_list_event_fields(fields);
2485 if (nb_fields < 0) {
f73fabfd 2486 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
2487 goto error;
2488 }
2489 break;
2490 case LTTNG_DOMAIN_KERNEL:
2491 default: /* fall-through */
f73fabfd 2492 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2493 goto error;
2494 }
2495
2496 return nb_fields;
2497
2498error:
2499 /* Return negative value to differentiate return code */
2500 return -ret;
2501}
2502
834978fd
DG
2503ssize_t cmd_list_syscalls(struct lttng_event **events)
2504{
2505 return syscall_table_list(events);
2506}
2507
a5dfbb9d
MD
2508/*
2509 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2510 *
2511 * Called with session lock held.
2512 */
2513ssize_t cmd_list_tracker_pids(struct ltt_session *session,
56a37563 2514 enum lttng_domain_type domain, int32_t **pids)
a5dfbb9d
MD
2515{
2516 int ret;
2517 ssize_t nr_pids = 0;
2518
2519 switch (domain) {
2520 case LTTNG_DOMAIN_KERNEL:
2521 {
2522 struct ltt_kernel_session *ksess;
2523
2524 ksess = session->kernel_session;
2525 nr_pids = kernel_list_tracker_pids(ksess, pids);
2526 if (nr_pids < 0) {
2527 ret = LTTNG_ERR_KERN_LIST_FAIL;
2528 goto error;
2529 }
2530 break;
2531 }
2532 case LTTNG_DOMAIN_UST:
2533 {
2534 struct ltt_ust_session *usess;
2535
2536 usess = session->ust_session;
2537 nr_pids = trace_ust_list_tracker_pids(usess, pids);
2538 if (nr_pids < 0) {
2539 ret = LTTNG_ERR_UST_LIST_FAIL;
2540 goto error;
2541 }
2542 break;
2543 }
2544 case LTTNG_DOMAIN_LOG4J:
2545 case LTTNG_DOMAIN_JUL:
2546 case LTTNG_DOMAIN_PYTHON:
2547 default:
2548 ret = LTTNG_ERR_UND;
2549 goto error;
2550 }
2551
2552 return nr_pids;
2553
2554error:
2555 /* Return negative value to differentiate return code */
2556 return -ret;
2557}
2558
2f77fc4b
DG
2559/*
2560 * Command LTTNG_START_TRACE processed by the client thread.
a9ad0c8f
MD
2561 *
2562 * Called with session mutex held.
2f77fc4b
DG
2563 */
2564int cmd_start_trace(struct ltt_session *session)
2565{
82b69413 2566 enum lttng_error_code ret;
cde3e505 2567 unsigned long nb_chan = 0;
2f77fc4b
DG
2568 struct ltt_kernel_session *ksession;
2569 struct ltt_ust_session *usess;
2f77fc4b
DG
2570
2571 assert(session);
2572
2573 /* Ease our life a bit ;) */
2574 ksession = session->kernel_session;
2575 usess = session->ust_session;
2576
8382cf6f
DG
2577 /* Is the session already started? */
2578 if (session->active) {
f73fabfd 2579 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2580 goto error;
2581 }
2582
cde3e505
DG
2583 /*
2584 * Starting a session without channel is useless since after that it's not
2585 * possible to enable channel thus inform the client.
2586 */
2587 if (usess && usess->domain_global.channels) {
2588 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
2589 }
2590 if (ksession) {
2591 nb_chan += ksession->channel_count;
2592 }
2593 if (!nb_chan) {
2594 ret = LTTNG_ERR_NO_CHANNEL;
2595 goto error;
2596 }
2597
070b6a86 2598 if (session->output_traces && !session->current_trace_chunk) {
d2956687
JG
2599 struct lttng_trace_chunk *trace_chunk;
2600
2601 trace_chunk = session_create_new_trace_chunk(
348a81dc 2602 session, NULL, NULL, NULL);
d2956687
JG
2603 if (!trace_chunk) {
2604 ret = LTTNG_ERR_CREATE_DIR_FAIL;
2605 goto error;
2606 }
2607 assert(!session->current_trace_chunk);
2608 ret = session_set_trace_chunk(session, trace_chunk, NULL);
2609 lttng_trace_chunk_put(trace_chunk);
2610 if (ret) {
2611 ret = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER;
5c408ad8
JD
2612 goto error;
2613 }
c996624c
JD
2614 }
2615
2f77fc4b
DG
2616 /* Kernel tracing */
2617 if (ksession != NULL) {
c996624c 2618 DBG("Start kernel tracing session %s", session->name);
7d268848 2619 ret = start_kernel_session(ksession);
9b6c7ec5 2620 if (ret != LTTNG_OK) {
2f77fc4b
DG
2621 goto error;
2622 }
2f77fc4b
DG
2623 }
2624
2625 /* Flag session that trace should start automatically */
2626 if (usess) {
82b69413
JG
2627 int int_ret = ust_app_start_trace_all(usess);
2628
2629 if (int_ret < 0) {
f73fabfd 2630 ret = LTTNG_ERR_UST_START_FAIL;
2f77fc4b
DG
2631 goto error;
2632 }
2633 }
2634
8382cf6f
DG
2635 /* Flag this after a successful start. */
2636 session->has_been_started = 1;
2637 session->active = 1;
9b6c7ec5 2638
5c408ad8
JD
2639 /*
2640 * Clear the flag that indicates that a rotation was done while the
2641 * session was stopped.
2642 */
2643 session->rotated_after_last_stop = false;
2644
259c2674 2645 if (session->rotate_timer_period) {
82b69413
JG
2646 int int_ret = timer_session_rotation_schedule_timer_start(
2647 session, session->rotate_timer_period);
2648
2649 if (int_ret < 0) {
259c2674
JD
2650 ERR("Failed to enable rotate timer");
2651 ret = LTTNG_ERR_UNK;
2652 goto error;
2653 }
2654 }
2655
f73fabfd 2656 ret = LTTNG_OK;
2f77fc4b
DG
2657
2658error:
2659 return ret;
2660}
2661
2662/*
2663 * Command LTTNG_STOP_TRACE processed by the client thread.
2664 */
2665int cmd_stop_trace(struct ltt_session *session)
2666{
2667 int ret;
2668 struct ltt_kernel_channel *kchan;
2669 struct ltt_kernel_session *ksession;
2670 struct ltt_ust_session *usess;
a9577b76 2671 bool error_occurred = false;
2f77fc4b
DG
2672
2673 assert(session);
2674
5c408ad8 2675 DBG("Begin stop session %s (id %" PRIu64 ")", session->name, session->id);
2f77fc4b
DG
2676 /* Short cut */
2677 ksession = session->kernel_session;
2678 usess = session->ust_session;
2679
8382cf6f
DG
2680 /* Session is not active. Skip everythong and inform the client. */
2681 if (!session->active) {
f73fabfd 2682 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2f77fc4b
DG
2683 goto error;
2684 }
2685
2f77fc4b 2686 /* Kernel tracer */
14fb1ebe 2687 if (ksession && ksession->active) {
2f77fc4b
DG
2688 DBG("Stop kernel tracing");
2689
566d8970
MD
2690 ret = kernel_stop_session(ksession);
2691 if (ret < 0) {
2692 ret = LTTNG_ERR_KERN_STOP_FAIL;
2693 goto error;
2694 }
2695
7d268848 2696 kernel_wait_quiescent();
566d8970
MD
2697
2698 /* Flush metadata after stopping (if exists) */
2f77fc4b
DG
2699 if (ksession->metadata_stream_fd >= 0) {
2700 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2701 if (ret < 0) {
2702 ERR("Kernel metadata flush failed");
a46a2b76 2703 error_occurred = true;
2f77fc4b
DG
2704 }
2705 }
2706
566d8970 2707 /* Flush all buffers after stopping */
2f77fc4b
DG
2708 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2709 ret = kernel_flush_buffer(kchan);
2710 if (ret < 0) {
2711 ERR("Kernel flush buffer error");
a46a2b76 2712 error_occurred = true;
2f77fc4b
DG
2713 }
2714 }
2715
14fb1ebe 2716 ksession->active = 0;
5c408ad8
JD
2717 DBG("Kernel session stopped %s (id %" PRIu64 ")", session->name,
2718 session->id);
2f77fc4b
DG
2719 }
2720
14fb1ebe 2721 if (usess && usess->active) {
2f77fc4b
DG
2722 ret = ust_app_stop_trace_all(usess);
2723 if (ret < 0) {
f73fabfd 2724 ret = LTTNG_ERR_UST_STOP_FAIL;
2f77fc4b
DG
2725 goto error;
2726 }
2727 }
2728
8382cf6f
DG
2729 /* Flag inactive after a successful stop. */
2730 session->active = 0;
a9577b76 2731 ret = !error_occurred ? LTTNG_OK : LTTNG_ERR_UNK;
2f77fc4b
DG
2732
2733error:
2734 return ret;
2735}
2736
2737/*
2738 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2739 */
bda32d56
JG
2740int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2741 struct lttng_uri *uris)
2f77fc4b
DG
2742{
2743 int ret, i;
2744 struct ltt_kernel_session *ksess = session->kernel_session;
2745 struct ltt_ust_session *usess = session->ust_session;
2f77fc4b
DG
2746
2747 assert(session);
2748 assert(uris);
2749 assert(nb_uri > 0);
2750
8382cf6f
DG
2751 /* Can't set consumer URI if the session is active. */
2752 if (session->active) {
f73fabfd 2753 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2754 goto error;
2755 }
2756
bda32d56 2757 /* Set the "global" consumer URIs */
2f77fc4b 2758 for (i = 0; i < nb_uri; i++) {
b178f53e
JG
2759 ret = add_uri_to_consumer(session,
2760 session->consumer,
2761 &uris[i], LTTNG_DOMAIN_NONE);
a74934ba 2762 if (ret != LTTNG_OK) {
2f77fc4b
DG
2763 goto error;
2764 }
2f77fc4b
DG
2765 }
2766
bda32d56
JG
2767 /* Set UST session URIs */
2768 if (session->ust_session) {
2769 for (i = 0; i < nb_uri; i++) {
b178f53e 2770 ret = add_uri_to_consumer(session,
bda32d56 2771 session->ust_session->consumer,
b178f53e 2772 &uris[i], LTTNG_DOMAIN_UST);
bda32d56
JG
2773 if (ret != LTTNG_OK) {
2774 goto error;
2775 }
2776 }
2777 }
2778
2779 /* Set kernel session URIs */
2780 if (session->kernel_session) {
2781 for (i = 0; i < nb_uri; i++) {
b178f53e 2782 ret = add_uri_to_consumer(session,
bda32d56 2783 session->kernel_session->consumer,
b178f53e 2784 &uris[i], LTTNG_DOMAIN_KERNEL);
bda32d56
JG
2785 if (ret != LTTNG_OK) {
2786 goto error;
2787 }
2788 }
2789 }
2790
7ab70fe0
DG
2791 /*
2792 * Make sure to set the session in output mode after we set URI since a
2793 * session can be created without URL (thus flagged in no output mode).
2794 */
2795 session->output_traces = 1;
2796 if (ksess) {
2797 ksess->output_traces = 1;
bda32d56
JG
2798 }
2799
2800 if (usess) {
7ab70fe0
DG
2801 usess->output_traces = 1;
2802 }
2803
2f77fc4b 2804 /* All good! */
f73fabfd 2805 ret = LTTNG_OK;
2f77fc4b
DG
2806
2807error:
2808 return ret;
2809}
2810
b178f53e
JG
2811static
2812enum lttng_error_code set_session_output_from_descriptor(
2813 struct ltt_session *session,
2814 const struct lttng_session_descriptor *descriptor)
2f77fc4b
DG
2815{
2816 int ret;
b178f53e
JG
2817 enum lttng_error_code ret_code = LTTNG_OK;
2818 enum lttng_session_descriptor_type session_type =
2819 lttng_session_descriptor_get_type(descriptor);
2820 enum lttng_session_descriptor_output_type output_type =
2821 lttng_session_descriptor_get_output_type(descriptor);
2822 struct lttng_uri uris[2] = {};
2823 size_t uri_count = 0;
2824
2825 switch (output_type) {
2826 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NONE:
2827 goto end;
2828 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_LOCAL:
2829 lttng_session_descriptor_get_local_output_uri(descriptor,
2830 &uris[0]);
2831 uri_count = 1;
2832 break;
2833 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NETWORK:
2834 lttng_session_descriptor_get_network_output_uris(descriptor,
2835 &uris[0], &uris[1]);
2836 uri_count = 2;
2837 break;
2838 default:
2839 ret_code = LTTNG_ERR_INVALID;
e32d7f27 2840 goto end;
2f77fc4b
DG
2841 }
2842
b178f53e
JG
2843 switch (session_type) {
2844 case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT:
2845 {
2846 struct snapshot_output *new_output = NULL;
2847
2848 new_output = snapshot_output_alloc();
2849 if (!new_output) {
2850 ret_code = LTTNG_ERR_NOMEM;
2851 goto end;
2852 }
2853
2854 ret = snapshot_output_init_with_uri(session,
2855 DEFAULT_SNAPSHOT_MAX_SIZE,
2856 NULL, uris, uri_count, session->consumer,
2857 new_output, &session->snapshot);
2858 if (ret < 0) {
2859 ret_code = (ret == -ENOMEM) ?
2860 LTTNG_ERR_NOMEM : LTTNG_ERR_INVALID;
2861 snapshot_output_destroy(new_output);
2862 goto end;
2863 }
2864 snapshot_add_output(&session->snapshot, new_output);
2865 break;
2866 }
2867 case LTTNG_SESSION_DESCRIPTOR_TYPE_REGULAR:
2868 case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE:
2869 {
2870 ret_code = cmd_set_consumer_uri(session, uri_count, uris);
2871 break;
2872 }
2873 default:
2874 ret_code = LTTNG_ERR_INVALID;
e32d7f27 2875 goto end;
2f77fc4b 2876 }
b178f53e
JG
2877end:
2878 return ret_code;
2879}
2880
2881static
2882enum lttng_error_code cmd_create_session_from_descriptor(
2883 struct lttng_session_descriptor *descriptor,
2884 const lttng_sock_cred *creds,
2885 const char *home_path)
2886{
2887 int ret;
2888 enum lttng_error_code ret_code;
2889 const char *session_name;
2890 struct ltt_session *new_session = NULL;
2891 enum lttng_session_descriptor_status descriptor_status;
6fa5fe7c 2892 const char *base_path;
2f77fc4b 2893
e32d7f27 2894 session_lock_list();
b178f53e
JG
2895 if (home_path) {
2896 if (*home_path != '/') {
2897 ERR("Home path provided by client is not absolute");
2898 ret_code = LTTNG_ERR_INVALID;
2899 goto end;
2900 }
2901 }
2f77fc4b 2902
b178f53e
JG
2903 descriptor_status = lttng_session_descriptor_get_session_name(
2904 descriptor, &session_name);
2905 switch (descriptor_status) {
2906 case LTTNG_SESSION_DESCRIPTOR_STATUS_OK:
2907 break;
2908 case LTTNG_SESSION_DESCRIPTOR_STATUS_UNSET:
2909 session_name = NULL;
2910 break;
2911 default:
2912 ret_code = LTTNG_ERR_INVALID;
2913 goto end;
2914 }
6fa5fe7c
MD
2915 ret = lttng_session_descriptor_get_base_path(descriptor, &base_path);
2916 if (ret) {
2917 ret_code = LTTNG_ERR_INVALID;
2918 goto end;
2919 }
b178f53e 2920 ret_code = session_create(session_name, creds->uid, creds->gid,
6fa5fe7c 2921 base_path, &new_session);
b178f53e 2922 if (ret_code != LTTNG_OK) {
e32d7f27 2923 goto end;
2f77fc4b
DG
2924 }
2925
b178f53e
JG
2926 if (!session_name) {
2927 ret = lttng_session_descriptor_set_session_name(descriptor,
2928 new_session->name);
2929 if (ret) {
2930 ret_code = LTTNG_ERR_SESSION_FAIL;
2931 goto end;
2932 }
2933 }
2934
2935 if (!lttng_session_descriptor_is_output_destination_initialized(
2936 descriptor)) {
2937 /*
2938 * Only include the session's creation time in the output
2939 * destination if the name of the session itself was
2940 * not auto-generated.
2941 */
2942 ret_code = lttng_session_descriptor_set_default_output(
2943 descriptor,
2944 session_name ? &new_session->creation_time : NULL,
2945 home_path);
2946 if (ret_code != LTTNG_OK) {
e32d7f27 2947 goto end;
2bba9e53 2948 }
2bba9e53 2949 } else {
b178f53e
JG
2950 new_session->has_user_specified_directory =
2951 lttng_session_descriptor_has_output_directory(
2952 descriptor);
2f77fc4b
DG
2953 }
2954
b178f53e
JG
2955 switch (lttng_session_descriptor_get_type(descriptor)) {
2956 case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT:
2957 new_session->snapshot_mode = 1;
2958 break;
2959 case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE:
2960 new_session->live_timer =
2961 lttng_session_descriptor_live_get_timer_interval(
2962 descriptor);
2963 break;
2964 default:
2965 break;
2966 }
2f77fc4b 2967
b178f53e
JG
2968 ret_code = set_session_output_from_descriptor(new_session, descriptor);
2969 if (ret_code != LTTNG_OK) {
2970 goto end;
2971 }
2972 new_session->consumer->enabled = 1;
2973 ret_code = LTTNG_OK;
e32d7f27 2974end:
b178f53e
JG
2975 /* Release reference provided by the session_create function. */
2976 session_put(new_session);
2977 if (ret_code != LTTNG_OK && new_session) {
2978 /* Release the global reference on error. */
2979 session_destroy(new_session);
e32d7f27 2980 }
b178f53e
JG
2981 session_unlock_list();
2982 return ret_code;
2f77fc4b
DG
2983}
2984
b178f53e
JG
2985enum lttng_error_code cmd_create_session(struct command_ctx *cmd_ctx, int sock,
2986 struct lttng_session_descriptor **return_descriptor)
27babd3a
DG
2987{
2988 int ret;
b178f53e
JG
2989 size_t payload_size;
2990 struct lttng_dynamic_buffer payload;
2991 struct lttng_buffer_view home_dir_view;
2992 struct lttng_buffer_view session_descriptor_view;
2993 struct lttng_session_descriptor *session_descriptor = NULL;
2994 enum lttng_error_code ret_code;
2995
2996 lttng_dynamic_buffer_init(&payload);
2997 if (cmd_ctx->lsm->u.create_session.home_dir_size >=
2998 LTTNG_PATH_MAX) {
2999 ret_code = LTTNG_ERR_INVALID;
3000 goto error;
27babd3a 3001 }
b178f53e
JG
3002 if (cmd_ctx->lsm->u.create_session.session_descriptor_size >
3003 LTTNG_SESSION_DESCRIPTOR_MAX_LEN) {
3004 ret_code = LTTNG_ERR_INVALID;
3005 goto error;
27babd3a
DG
3006 }
3007
b178f53e
JG
3008 payload_size = cmd_ctx->lsm->u.create_session.home_dir_size +
3009 cmd_ctx->lsm->u.create_session.session_descriptor_size;
3010 ret = lttng_dynamic_buffer_set_size(&payload, payload_size);
3011 if (ret) {
3012 ret_code = LTTNG_ERR_NOMEM;
3013 goto error;
27babd3a
DG
3014 }
3015
b178f53e
JG
3016 ret = lttcomm_recv_unix_sock(sock, payload.data, payload.size);
3017 if (ret <= 0) {
3018 ERR("Reception of session descriptor failed, aborting.");
3019 ret_code = LTTNG_ERR_SESSION_FAIL;
3020 goto error;
27babd3a
DG
3021 }
3022
b178f53e
JG
3023 home_dir_view = lttng_buffer_view_from_dynamic_buffer(
3024 &payload,
3025 0,
3026 cmd_ctx->lsm->u.create_session.home_dir_size);
3027 session_descriptor_view = lttng_buffer_view_from_dynamic_buffer(
3028 &payload,
3029 cmd_ctx->lsm->u.create_session.home_dir_size,
3030 cmd_ctx->lsm->u.create_session.session_descriptor_size);
27babd3a 3031
b178f53e
JG
3032 ret = lttng_session_descriptor_create_from_buffer(
3033 &session_descriptor_view, &session_descriptor);
3034 if (ret < 0) {
3035 ERR("Failed to create session descriptor from payload of \"create session\" command");
3036 ret_code = LTTNG_ERR_INVALID;
3037 goto error;
3038 }
27babd3a 3039
b178f53e
JG
3040 /*
3041 * Sets the descriptor's auto-generated properties (name, output) if
3042 * needed.
3043 */
3044 ret_code = cmd_create_session_from_descriptor(session_descriptor,
3045 &cmd_ctx->creds,
3046 home_dir_view.size ? home_dir_view.data : NULL);
3047 if (ret_code != LTTNG_OK) {
3048 goto error;
e32d7f27 3049 }
b178f53e
JG
3050
3051 ret_code = LTTNG_OK;
3052 *return_descriptor = session_descriptor;
3053 session_descriptor = NULL;
3054error:
3055 lttng_dynamic_buffer_reset(&payload);
3056 lttng_session_descriptor_destroy(session_descriptor);
3057 return ret_code;
27babd3a
DG
3058}
3059
3e3665b8
JG
3060static
3061void cmd_destroy_session_reply(const struct ltt_session *session,
3062 void *_reply_context)
3063{
3064 int ret;
3065 ssize_t comm_ret;
3066 const struct cmd_destroy_session_reply_context *reply_context =
3067 _reply_context;
3068 struct lttng_dynamic_buffer payload;
3069 struct lttcomm_session_destroy_command_header cmd_header;
3070 struct lttng_trace_archive_location *location = NULL;
3071 struct lttcomm_lttng_msg llm = {
3072 .cmd_type = LTTNG_DESTROY_SESSION,
3073 .ret_code = LTTNG_OK,
3074 .pid = UINT32_MAX,
3075 .cmd_header_size =
3076 sizeof(struct lttcomm_session_destroy_command_header),
3077 .data_size = 0,
3078 };
3079 size_t payload_size_before_location;
3080
3081 lttng_dynamic_buffer_init(&payload);
3082
3083 ret = lttng_dynamic_buffer_append(&payload, &llm, sizeof(llm));
3084 if (ret) {
3085 ERR("Failed to append session destruction message");
3086 goto error;
3087 }
3088
3089 cmd_header.rotation_state =
3090 (int32_t) (reply_context->implicit_rotation_on_destroy ?
3091 session->rotation_state :
3092 LTTNG_ROTATION_STATE_NO_ROTATION);
3093 ret = lttng_dynamic_buffer_append(&payload, &cmd_header,
3094 sizeof(cmd_header));
3095 if (ret) {
3096 ERR("Failed to append session destruction command header");
3097 goto error;
3098 }
3099
3100 if (!reply_context->implicit_rotation_on_destroy) {
3101 DBG("No implicit rotation performed during the destruction of session \"%s\", sending reply",
3102 session->name);
3103 goto send_reply;
3104 }
3105 if (session->rotation_state != LTTNG_ROTATION_STATE_COMPLETED) {
3106 DBG("Rotation state of session \"%s\" is not \"completed\", sending session destruction reply",
3107 session->name);
3108 goto send_reply;
3109 }
3110
3111 location = session_get_trace_archive_location(session);
3112 if (!location) {
3113 ERR("Failed to get the location of the trace archive produced during the destruction of session \"%s\"",
3114 session->name);
3115 goto error;
3116 }
3117
3118 payload_size_before_location = payload.size;
3119 comm_ret = lttng_trace_archive_location_serialize(location,
3120 &payload);
3121 if (comm_ret < 0) {
3122 ERR("Failed to serialize the location of the trace archive produced during the destruction of session \"%s\"",
3123 session->name);
3124 goto error;
3125 }
3126 /* Update the message to indicate the location's length. */
3127 ((struct lttcomm_lttng_msg *) payload.data)->data_size =
3128 payload.size - payload_size_before_location;
3129send_reply:
3130 comm_ret = lttcomm_send_unix_sock(reply_context->reply_sock_fd,
3131 payload.data, payload.size);
3132 if (comm_ret != (ssize_t) payload.size) {
3133 ERR("Failed to send result of the destruction of session \"%s\" to client",
3134 session->name);
3135 }
3136error:
3137 ret = close(reply_context->reply_sock_fd);
3138 if (ret) {
3139 PERROR("Failed to close client socket in deferred session destroy reply");
3140 }
3141 lttng_dynamic_buffer_reset(&payload);
3142 free(_reply_context);
3143}
3144
2f77fc4b
DG
3145/*
3146 * Command LTTNG_DESTROY_SESSION processed by the client thread.
a9ad0c8f
MD
3147 *
3148 * Called with session lock held.
2f77fc4b 3149 */
e32d7f27 3150int cmd_destroy_session(struct ltt_session *session,
3e3665b8
JG
3151 struct notification_thread_handle *notification_thread_handle,
3152 int *sock_fd)
2f77fc4b
DG
3153{
3154 int ret;
3e3665b8
JG
3155 struct cmd_destroy_session_reply_context *reply_context = NULL;
3156
3157 if (sock_fd) {
3158 reply_context = zmalloc(sizeof(*reply_context));
3159 if (!reply_context) {
3160 ret = LTTNG_ERR_NOMEM;
3161 goto end;
3162 }
3163 reply_context->reply_sock_fd = *sock_fd;
3164 }
2f77fc4b
DG
3165
3166 /* Safety net */
3167 assert(session);
3168
3e3665b8
JG
3169 DBG("Begin destroy session %s (id %" PRIu64 ")", session->name,
3170 session->id);
3171 if (session->active) {
3172 DBG("Session \"%s\" is active, attempting to stop it before destroying it",
3173 session->name);
3174 ret = cmd_stop_trace(session);
3175 if (ret != LTTNG_OK && ret != LTTNG_ERR_TRACE_ALREADY_STOPPED) {
3176 /* Carry on with the destruction of the session. */
3177 ERR("Failed to stop session \"%s\" as part of its destruction: %s",
3178 session->name, lttng_strerror(-ret));
3179 }
3180 }
5c408ad8 3181
92816cc3
JG
3182 if (session->rotation_schedule_timer_enabled) {
3183 if (timer_session_rotation_schedule_timer_stop(
3184 session)) {
3185 ERR("Failed to stop the \"rotation schedule\" timer of session %s",
3186 session->name);
3187 }
259c2674
JD
3188 }
3189
90936dcf
JD
3190 if (session->rotate_size) {
3191 unsubscribe_session_consumed_size_rotation(session, notification_thread_handle);
3192 session->rotate_size = 0;
3193 }
3194
d2956687
JG
3195 if (session->most_recent_chunk_id.is_set &&
3196 session->most_recent_chunk_id.value != 0 &&
b5893d8e
JG
3197 session->current_trace_chunk && session->output_traces) {
3198 /*
3199 * Perform a last rotation on destruction if rotations have
3200 * occurred during the session's lifetime.
3201 */
7fdbed1c 3202 ret = cmd_rotate_session(session, NULL, false);
d2956687
JG
3203 if (ret != LTTNG_OK) {
3204 ERR("Failed to perform an implicit rotation as part of the destruction of session \"%s\": %s",
3205 session->name, lttng_strerror(-ret));
124473a3 3206 }
3e3665b8
JG
3207 if (reply_context) {
3208 reply_context->implicit_rotation_on_destroy = true;
3209 }
070b6a86 3210 } else if (session->has_been_started && session->current_trace_chunk) {
7fdbed1c
JG
3211 /*
3212 * The user has not triggered a session rotation. However, to
3213 * ensure all data has been consumed, the session is rotated
3214 * to a 'null' trace chunk before it is destroyed.
3215 *
3216 * This is a "quiet" rotation meaning that no notification is
3217 * emitted and no renaming of the current trace chunk takes
3218 * place.
3219 */
3220 ret = cmd_rotate_session(session, NULL, true);
3221 if (ret != LTTNG_OK) {
3222 ERR("Failed to perform a quiet rotation as part of the destruction of session \"%s\": %s",
3223 session->name, lttng_strerror(-ret));
3224 }
3225 }
5c408ad8 3226
a503e1ef
JG
3227 if (session->shm_path[0]) {
3228 /*
3229 * When a session is created with an explicit shm_path,
3230 * the consumer daemon will create its shared memory files
3231 * at that location and will *not* unlink them. This is normal
3232 * as the intention of that feature is to make it possible
3233 * to retrieve the content of those files should a crash occur.
3234 *
3235 * To ensure the content of those files can be used, the
3236 * sessiond daemon will replicate the content of the metadata
3237 * cache in a metadata file.
3238 *
3239 * On clean-up, it is expected that the consumer daemon will
3240 * unlink the shared memory files and that the session daemon
3241 * will unlink the metadata file. Then, the session's directory
3242 * in the shm path can be removed.
3243 *
3244 * Unfortunately, a flaw in the design of the sessiond's and
3245 * consumerd's tear down of channels makes it impossible to
3246 * determine when the sessiond _and_ the consumerd have both
3247 * destroyed their representation of a channel. For one, the
3248 * unlinking, close, and rmdir happen in deferred 'call_rcu'
3249 * callbacks in both daemons.
3250 *
3251 * However, it is also impossible for the sessiond to know when
3252 * the consumer daemon is done destroying its channel(s) since
3253 * it occurs as a reaction to the closing of the channel's file
3254 * descriptor. There is no resulting communication initiated
3255 * from the consumerd to the sessiond to confirm that the
3256 * operation is completed (and was successful).
3257 *
3258 * Until this is all fixed, the session daemon checks for the
3259 * removal of the session's shm path which makes it possible
3260 * to safely advertise a session as having been destroyed.
3261 *
3262 * Prior to this fix, it was not possible to reliably save
3263 * a session making use of the --shm-path option, destroy it,
3264 * and load it again. This is because the creation of the
3265 * session would fail upon seeing the session's shm path
3266 * already in existence.
3267 *
3268 * Note that none of the error paths in the check for the
3269 * directory's existence return an error. This is normal
3270 * as there isn't much that can be done. The session will
3271 * be destroyed properly, except that we can't offer the
3272 * guarantee that the same session can be re-created.
3273 */
3274 current_completion_handler = &destroy_completion_handler.handler;
3275 ret = lttng_strncpy(destroy_completion_handler.shm_path,
3276 session->shm_path,
3277 sizeof(destroy_completion_handler.shm_path));
3278 assert(!ret);
3279 }
e32d7f27
JG
3280
3281 /*
3282 * The session is destroyed. However, note that the command context
3283 * still holds a reference to the session, thus delaying its destruction
3284 * _at least_ up to the point when that reference is released.
3285 */
3286 session_destroy(session);
3e3665b8
JG
3287 if (reply_context) {
3288 ret = session_add_destroy_notifier(session,
3289 cmd_destroy_session_reply,
3290 (void *) reply_context);
3291 if (ret) {
3292 ret = LTTNG_ERR_FATAL;
3293 goto end;
3294 } else {
3295 *sock_fd = -1;
3296 }
3297 }
3298 ret = LTTNG_OK;
3299end:
2f77fc4b
DG
3300 return ret;
3301}
3302
2f77fc4b
DG
3303/*
3304 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3305 */
56a37563
JG
3306int cmd_register_consumer(struct ltt_session *session,
3307 enum lttng_domain_type domain, const char *sock_path,
3308 struct consumer_data *cdata)
2f77fc4b
DG
3309{
3310 int ret, sock;
dd81b457 3311 struct consumer_socket *socket = NULL;
2f77fc4b
DG
3312
3313 assert(session);
3314 assert(cdata);
3315 assert(sock_path);
3316
3317 switch (domain) {
3318 case LTTNG_DOMAIN_KERNEL:
3319 {
3320 struct ltt_kernel_session *ksess = session->kernel_session;
3321
3322 assert(ksess);
3323
3324 /* Can't register a consumer if there is already one */
3325 if (ksess->consumer_fds_sent != 0) {
f73fabfd 3326 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
3327 goto error;
3328 }
3329
3330 sock = lttcomm_connect_unix_sock(sock_path);
3331 if (sock < 0) {
f73fabfd 3332 ret = LTTNG_ERR_CONNECT_FAIL;
2f77fc4b
DG
3333 goto error;
3334 }
4ce514c4 3335 cdata->cmd_sock = sock;
2f77fc4b 3336
4ce514c4 3337 socket = consumer_allocate_socket(&cdata->cmd_sock);
2f77fc4b 3338 if (socket == NULL) {
f66c074c
DG
3339 ret = close(sock);
3340 if (ret < 0) {
3341 PERROR("close register consumer");
3342 }
4ce514c4 3343 cdata->cmd_sock = -1;
f73fabfd 3344 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
3345 goto error;
3346 }
3347
3348 socket->lock = zmalloc(sizeof(pthread_mutex_t));
3349 if (socket->lock == NULL) {
3350 PERROR("zmalloc pthread mutex");
f73fabfd 3351 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
3352 goto error;
3353 }
3354 pthread_mutex_init(socket->lock, NULL);
3355 socket->registered = 1;
3356
3357 rcu_read_lock();
3358 consumer_add_socket(socket, ksess->consumer);
3359 rcu_read_unlock();
3360
3361 pthread_mutex_lock(&cdata->pid_mutex);
3362 cdata->pid = -1;
3363 pthread_mutex_unlock(&cdata->pid_mutex);
3364
3365 break;
3366 }
3367 default:
3368 /* TODO: Userspace tracing */
f73fabfd 3369 ret = LTTNG_ERR_UND;
2f77fc4b
DG
3370 goto error;
3371 }
3372
dd81b457 3373 return LTTNG_OK;
2f77fc4b
DG
3374
3375error:
dd81b457
DG
3376 if (socket) {
3377 consumer_destroy_socket(socket);
3378 }
2f77fc4b
DG
3379 return ret;
3380}
3381
3382/*
3383 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3384 */
3385ssize_t cmd_list_domains(struct ltt_session *session,
3386 struct lttng_domain **domains)
3387{
3388 int ret, index = 0;
3389 ssize_t nb_dom = 0;
fefd409b
DG
3390 struct agent *agt;
3391 struct lttng_ht_iter iter;
2f77fc4b
DG
3392
3393 if (session->kernel_session != NULL) {
3394 DBG3("Listing domains found kernel domain");
3395 nb_dom++;
3396 }
3397
3398 if (session->ust_session != NULL) {
3399 DBG3("Listing domains found UST global domain");
3400 nb_dom++;
3c6a091f 3401
e0a74f01 3402 rcu_read_lock();
fefd409b
DG
3403 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
3404 agt, node.node) {
3405 if (agt->being_used) {
3406 nb_dom++;
3407 }
3c6a091f 3408 }
e0a74f01 3409 rcu_read_unlock();
2f77fc4b
DG
3410 }
3411
fa64dfb4
JG
3412 if (!nb_dom) {
3413 goto end;
3414 }
3415
2f77fc4b
DG
3416 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3417 if (*domains == NULL) {
f73fabfd 3418 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
3419 goto error;
3420 }
3421
3422 if (session->kernel_session != NULL) {
3423 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
b5edb9e8
PP
3424
3425 /* Kernel session buffer type is always GLOBAL */
3426 (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL;
3427
2f77fc4b
DG
3428 index++;
3429 }
3430
3431 if (session->ust_session != NULL) {
3432 (*domains)[index].type = LTTNG_DOMAIN_UST;
88c5f0d8 3433 (*domains)[index].buf_type = session->ust_session->buffer_type;
2f77fc4b 3434 index++;
3c6a091f 3435
e0a74f01 3436 rcu_read_lock();
fefd409b
DG
3437 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
3438 agt, node.node) {
3439 if (agt->being_used) {
3440 (*domains)[index].type = agt->domain;
3441 (*domains)[index].buf_type = session->ust_session->buffer_type;
3442 index++;
3443 }
3c6a091f 3444 }
e0a74f01 3445 rcu_read_unlock();
2f77fc4b 3446 }
fa64dfb4 3447end:
2f77fc4b
DG
3448 return nb_dom;
3449
3450error:
f73fabfd
DG
3451 /* Return negative value to differentiate return code */
3452 return -ret;
2f77fc4b
DG
3453}
3454
3455
3456/*
3457 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3458 */
56a37563
JG
3459ssize_t cmd_list_channels(enum lttng_domain_type domain,
3460 struct ltt_session *session, struct lttng_channel **channels)
2f77fc4b 3461{
53e367f9 3462 ssize_t nb_chan = 0, payload_size = 0, ret;
2f77fc4b
DG
3463
3464 switch (domain) {
3465 case LTTNG_DOMAIN_KERNEL:
3466 if (session->kernel_session != NULL) {
3467 nb_chan = session->kernel_session->channel_count;
3468 }
3469 DBG3("Number of kernel channels %zd", nb_chan);
c7d620a2 3470 if (nb_chan <= 0) {
53e367f9
JG
3471 ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND;
3472 goto end;
c7d620a2 3473 }
2f77fc4b
DG
3474 break;
3475 case LTTNG_DOMAIN_UST:
3476 if (session->ust_session != NULL) {
7ffc31a2 3477 rcu_read_lock();
2f77fc4b 3478 nb_chan = lttng_ht_get_count(
7ffc31a2
JG
3479 session->ust_session->domain_global.channels);
3480 rcu_read_unlock();
2f77fc4b
DG
3481 }
3482 DBG3("Number of UST global channels %zd", nb_chan);
ade7ce52 3483 if (nb_chan < 0) {
53e367f9
JG
3484 ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND;
3485 goto end;
c7d620a2 3486 }
2f77fc4b
DG
3487 break;
3488 default:
53e367f9
JG
3489 ret = -LTTNG_ERR_UND;
3490 goto end;
2f77fc4b
DG
3491 }
3492
3493 if (nb_chan > 0) {
53e367f9 3494 const size_t channel_size = sizeof(struct lttng_channel) +
cf0bcb51
JG
3495 sizeof(struct lttng_channel_extended);
3496 struct lttng_channel_extended *channel_exts;
53e367f9
JG
3497
3498 payload_size = nb_chan * channel_size;
3499 *channels = zmalloc(payload_size);
2f77fc4b 3500 if (*channels == NULL) {
53e367f9
JG
3501 ret = -LTTNG_ERR_FATAL;
3502 goto end;
2f77fc4b
DG
3503 }
3504
53e367f9
JG
3505 channel_exts = ((void *) *channels) +
3506 (nb_chan * sizeof(struct lttng_channel));
d449df4a
MD
3507 ret = list_lttng_channels(domain, session, *channels, channel_exts);
3508 if (ret != LTTNG_OK) {
3509 free(*channels);
3510 *channels = NULL;
3511 goto end;
3512 }
53e367f9
JG
3513 } else {
3514 *channels = NULL;
2f77fc4b
DG
3515 }
3516
53e367f9
JG
3517 ret = payload_size;
3518end:
3519 return ret;
2f77fc4b
DG
3520}
3521
3522/*
3523 * Command LTTNG_LIST_EVENTS processed by the client thread.
3524 */
56a37563
JG
3525ssize_t cmd_list_events(enum lttng_domain_type domain,
3526 struct ltt_session *session, char *channel_name,
b4e3ceb9 3527 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
3528{
3529 int ret = 0;
3530 ssize_t nb_event = 0;
3531
3532 switch (domain) {
3533 case LTTNG_DOMAIN_KERNEL:
3534 if (session->kernel_session != NULL) {
3535 nb_event = list_lttng_kernel_events(channel_name,
b4e3ceb9
PP
3536 session->kernel_session, events,
3537 total_size);
2f77fc4b
DG
3538 }
3539 break;
3540 case LTTNG_DOMAIN_UST:
3541 {
3542 if (session->ust_session != NULL) {
3543 nb_event = list_lttng_ust_global_events(channel_name,
b4e3ceb9
PP
3544 &session->ust_session->domain_global, events,
3545 total_size);
2f77fc4b
DG
3546 }
3547 break;
3548 }
5cdb6027 3549 case LTTNG_DOMAIN_LOG4J:
3c6a091f 3550 case LTTNG_DOMAIN_JUL:
0e115563 3551 case LTTNG_DOMAIN_PYTHON:
3c6a091f 3552 if (session->ust_session) {
fefd409b
DG
3553 struct lttng_ht_iter iter;
3554 struct agent *agt;
3555
b11feea5 3556 rcu_read_lock();
fefd409b
DG
3557 cds_lfht_for_each_entry(session->ust_session->agents->ht,
3558 &iter.iter, agt, node.node) {
1dfd9906
JG
3559 if (agt->domain == domain) {
3560 nb_event = list_lttng_agent_events(
b4e3ceb9
PP
3561 agt, events,
3562 total_size);
1dfd9906
JG
3563 break;
3564 }
fefd409b 3565 }
b11feea5 3566 rcu_read_unlock();
3c6a091f
DG
3567 }
3568 break;
2f77fc4b 3569 default:
f73fabfd 3570 ret = LTTNG_ERR_UND;
2f77fc4b
DG
3571 goto error;
3572 }
3573
f73fabfd 3574 return nb_event;
2f77fc4b
DG
3575
3576error:
f73fabfd
DG
3577 /* Return negative value to differentiate return code */
3578 return -ret;
2f77fc4b
DG
3579}
3580
3581/*
3582 * Using the session list, filled a lttng_session array to send back to the
3583 * client for session listing.
3584 *
3585 * The session list lock MUST be acquired before calling this function. Use
3586 * session_lock_list() and session_unlock_list().
3587 */
b178f53e
JG
3588void cmd_list_lttng_sessions(struct lttng_session *sessions,
3589 size_t session_count, uid_t uid, gid_t gid)
2f77fc4b
DG
3590{
3591 int ret;
3592 unsigned int i = 0;
3593 struct ltt_session *session;
3594 struct ltt_session_list *list = session_get_list();
b178f53e
JG
3595 struct lttng_session_extended *extended =
3596 (typeof(extended)) (&sessions[session_count]);
2f77fc4b
DG
3597
3598 DBG("Getting all available session for UID %d GID %d",
3599 uid, gid);
3600 /*
3601 * Iterate over session list and append data after the control struct in
3602 * the buffer.
3603 */
3604 cds_list_for_each_entry(session, &list->head, list) {
e32d7f27
JG
3605 if (!session_get(session)) {
3606 continue;
3607 }
2f77fc4b
DG
3608 /*
3609 * Only list the sessions the user can control.
3610 */
e32d7f27
JG
3611 if (!session_access_ok(session, uid, gid) ||
3612 session->destroyed) {
3613 session_put(session);
2f77fc4b
DG
3614 continue;
3615 }
3616
3617 struct ltt_kernel_session *ksess = session->kernel_session;
3618 struct ltt_ust_session *usess = session->ust_session;
3619
3620 if (session->consumer->type == CONSUMER_DST_NET ||
3621 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
3622 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
3623 ret = build_network_session_path(sessions[i].path,
dec56f6c 3624 sizeof(sessions[i].path), session);
2f77fc4b 3625 } else {
dec56f6c 3626 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
366a9222 3627 session->consumer->dst.session_root_path);
2f77fc4b
DG
3628 }
3629 if (ret < 0) {
3630 PERROR("snprintf session path");
e32d7f27 3631 session_put(session);
2f77fc4b
DG
3632 continue;
3633 }
3634
3635 strncpy(sessions[i].name, session->name, NAME_MAX);
3636 sessions[i].name[NAME_MAX - 1] = '\0';
8382cf6f 3637 sessions[i].enabled = session->active;
2cbf8fed 3638 sessions[i].snapshot_mode = session->snapshot_mode;
8960e9cd 3639 sessions[i].live_timer_interval = session->live_timer;
b178f53e
JG
3640 extended[i].creation_time.value = (uint64_t) session->creation_time;
3641 extended[i].creation_time.is_set = 1;
2f77fc4b 3642 i++;
e32d7f27 3643 session_put(session);
2f77fc4b
DG
3644 }
3645}
3646
806e2684 3647/*
6d805429 3648 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
d3f14b8a 3649 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
806e2684 3650 */
6d805429 3651int cmd_data_pending(struct ltt_session *session)
806e2684
DG
3652{
3653 int ret;
3654 struct ltt_kernel_session *ksess = session->kernel_session;
3655 struct ltt_ust_session *usess = session->ust_session;
3656
3657 assert(session);
3658
5c408ad8
JD
3659 DBG("Data pending for session %s", session->name);
3660
806e2684 3661 /* Session MUST be stopped to ask for data availability. */
8382cf6f 3662 if (session->active) {
806e2684
DG
3663 ret = LTTNG_ERR_SESSION_STARTED;
3664 goto error;
3a89d11a
DG
3665 } else {
3666 /*
3667 * If stopped, just make sure we've started before else the above call
3668 * will always send that there is data pending.
3669 *
3670 * The consumer assumes that when the data pending command is received,
3671 * the trace has been started before or else no output data is written
3672 * by the streams which is a condition for data pending. So, this is
3673 * *VERY* important that we don't ask the consumer before a start
3674 * trace.
3675 */
8382cf6f 3676 if (!session->has_been_started) {
3a89d11a
DG
3677 ret = 0;
3678 goto error;
3679 }
806e2684
DG
3680 }
3681
92816cc3
JG
3682 /* A rotation is still pending, we have to wait. */
3683 if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
5c408ad8
JD
3684 DBG("Rotate still pending for session %s", session->name);
3685 ret = 1;
3686 goto error;
3687 }
3688
806e2684 3689 if (ksess && ksess->consumer) {
6d805429
DG
3690 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
3691 if (ret == 1) {
806e2684
DG
3692 /* Data is still being extracted for the kernel. */
3693 goto error;
3694 }
3695 }
3696
3697 if (usess && usess->consumer) {
6d805429
DG
3698 ret = consumer_is_data_pending(usess->id, usess->consumer);
3699 if (ret == 1) {
806e2684
DG
3700 /* Data is still being extracted for the kernel. */
3701 goto error;
3702 }
3703 }
3704
3705 /* Data is ready to be read by a viewer */
6d805429 3706 ret = 0;
806e2684
DG
3707
3708error:
3709 return ret;
3710}
3711
6dc3064a
DG
3712/*
3713 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
3714 *
3715 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3716 */
3717int cmd_snapshot_add_output(struct ltt_session *session,
df4f5a87 3718 const struct lttng_snapshot_output *output, uint32_t *id)
6dc3064a
DG
3719{
3720 int ret;
3721 struct snapshot_output *new_output;
3722
3723 assert(session);
3724 assert(output);
3725
3726 DBG("Cmd snapshot add output for session %s", session->name);
3727
3728 /*
903ef685 3729 * Can't create an output if the session is not set in no-output mode.
6dc3064a
DG
3730 */
3731 if (session->output_traces) {
903ef685 3732 ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
6dc3064a
DG
3733 goto error;
3734 }
3735
54213acc
JG
3736 if (session->has_non_mmap_channel) {
3737 ret = LTTNG_ERR_SNAPSHOT_UNSUPPORTED;
3738 goto error;
3739 }
3740
6dc3064a
DG
3741 /* Only one output is allowed until we have the "tee" feature. */
3742 if (session->snapshot.nb_output == 1) {
3743 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
3744 goto error;
3745 }
3746
3747 new_output = snapshot_output_alloc();
3748 if (!new_output) {
3749 ret = LTTNG_ERR_NOMEM;
3750 goto error;
3751 }
3752
b178f53e 3753 ret = snapshot_output_init(session, output->max_size, output->name,
6dc3064a
DG
3754 output->ctrl_url, output->data_url, session->consumer, new_output,
3755 &session->snapshot);
3756 if (ret < 0) {
3757 if (ret == -ENOMEM) {
3758 ret = LTTNG_ERR_NOMEM;
3759 } else {
3760 ret = LTTNG_ERR_INVALID;
3761 }
3762 goto free_error;
3763 }
3764
6dc3064a
DG
3765 rcu_read_lock();
3766 snapshot_add_output(&session->snapshot, new_output);
3767 if (id) {
3768 *id = new_output->id;
3769 }
3770 rcu_read_unlock();
3771
3772 return LTTNG_OK;
3773
3774free_error:
3775 snapshot_output_destroy(new_output);
3776error:
3777 return ret;
3778}
3779
3780/*
3781 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
3782 *
3783 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3784 */
3785int cmd_snapshot_del_output(struct ltt_session *session,
df4f5a87 3786 const struct lttng_snapshot_output *output)
6dc3064a
DG
3787{
3788 int ret;
eb240553 3789 struct snapshot_output *sout = NULL;
6dc3064a
DG
3790
3791 assert(session);
3792 assert(output);
3793
6dc3064a
DG
3794 rcu_read_lock();
3795
3796 /*
d3f14b8a
MD
3797 * Permission denied to create an output if the session is not
3798 * set in no output mode.
6dc3064a
DG
3799 */
3800 if (session->output_traces) {
903ef685 3801 ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
6dc3064a
DG
3802 goto error;
3803 }
3804
eb240553
DG
3805 if (output->id) {
3806 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
3807 session->name);
3808 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
3809 } else if (*output->name != '\0') {
3810 DBG("Cmd snapshot del output name %s for session %s", output->name,
3811 session->name);
3812 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
3813 }
6dc3064a
DG
3814 if (!sout) {
3815 ret = LTTNG_ERR_INVALID;
3816 goto error;
3817 }
3818
3819 snapshot_delete_output(&session->snapshot, sout);
3820 snapshot_output_destroy(sout);
3821 ret = LTTNG_OK;
3822
3823error:
3824 rcu_read_unlock();
3825 return ret;
3826}
3827
3828/*
3829 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
3830 *
3831 * If no output is available, outputs is untouched and 0 is returned.
3832 *
3833 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
3834 */
3835ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
3836 struct lttng_snapshot_output **outputs)
3837{
3838 int ret, idx = 0;
b223ca94 3839 struct lttng_snapshot_output *list = NULL;
6dc3064a
DG
3840 struct lttng_ht_iter iter;
3841 struct snapshot_output *output;
3842
3843 assert(session);
3844 assert(outputs);
3845
3846 DBG("Cmd snapshot list outputs for session %s", session->name);
3847
3848 /*
d3f14b8a
MD
3849 * Permission denied to create an output if the session is not
3850 * set in no output mode.
6dc3064a
DG
3851 */
3852 if (session->output_traces) {
903ef685
JG
3853 ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION;
3854 goto end;
6dc3064a
DG
3855 }
3856
3857 if (session->snapshot.nb_output == 0) {
3858 ret = 0;
903ef685 3859 goto end;
6dc3064a
DG
3860 }
3861
3862 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
3863 if (!list) {
b223ca94 3864 ret = -LTTNG_ERR_NOMEM;
903ef685 3865 goto end;
6dc3064a
DG
3866 }
3867
3868 /* Copy list from session to the new list object. */
b223ca94 3869 rcu_read_lock();
6dc3064a
DG
3870 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
3871 output, node.node) {
3872 assert(output->consumer);
3873 list[idx].id = output->id;
3874 list[idx].max_size = output->max_size;
6ce22875
MD
3875 if (lttng_strncpy(list[idx].name, output->name,
3876 sizeof(list[idx].name))) {
3877 ret = -LTTNG_ERR_INVALID;
903ef685 3878 goto error;
6ce22875 3879 }
6dc3064a 3880 if (output->consumer->type == CONSUMER_DST_LOCAL) {
6ce22875 3881 if (lttng_strncpy(list[idx].ctrl_url,
366a9222 3882 output->consumer->dst.session_root_path,
6ce22875
MD
3883 sizeof(list[idx].ctrl_url))) {
3884 ret = -LTTNG_ERR_INVALID;
903ef685 3885 goto error;
6ce22875 3886 }
6dc3064a
DG
3887 } else {
3888 /* Control URI. */
3889 ret = uri_to_str_url(&output->consumer->dst.net.control,
3890 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
3891 if (ret < 0) {
b223ca94 3892 ret = -LTTNG_ERR_NOMEM;
903ef685 3893 goto error;
6dc3064a
DG
3894 }
3895
3896 /* Data URI. */
3897 ret = uri_to_str_url(&output->consumer->dst.net.data,
3898 list[idx].data_url, sizeof(list[idx].data_url));
3899 if (ret < 0) {
b223ca94 3900 ret = -LTTNG_ERR_NOMEM;
903ef685 3901 goto error;
6dc3064a
DG
3902 }
3903 }
3904 idx++;
3905 }
3906
3907 *outputs = list;
b223ca94
JG
3908 list = NULL;
3909 ret = session->snapshot.nb_output;
6dc3064a 3910error:
903ef685 3911 rcu_read_unlock();
b223ca94 3912 free(list);
903ef685 3913end:
b223ca94 3914 return ret;
6dc3064a
DG
3915}
3916
93ec662e
JD
3917/*
3918 * Check if we can regenerate the metadata for this session.
3919 * Only kernel, UST per-uid and non-live sessions are supported.
3920 *
3921 * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise.
3922 */
3923static
eded6438 3924int check_regenerate_metadata_support(struct ltt_session *session)
93ec662e
JD
3925{
3926 int ret;
3927
3928 assert(session);
3929
3930 if (session->live_timer != 0) {
3931 ret = LTTNG_ERR_LIVE_SESSION;
3932 goto end;
3933 }
3934 if (!session->active) {
3935 ret = LTTNG_ERR_SESSION_NOT_STARTED;
3936 goto end;
3937 }
3938 if (session->ust_session) {
3939 switch (session->ust_session->buffer_type) {
3940 case LTTNG_BUFFER_PER_UID:
3941 break;
3942 case LTTNG_BUFFER_PER_PID:
3943 ret = LTTNG_ERR_PER_PID_SESSION;
3944 goto end;
3945 default:
3946 assert(0);
3947 ret = LTTNG_ERR_UNK;
3948 goto end;
3949 }
3950 }
3951 if (session->consumer->type == CONSUMER_DST_NET &&
3952 session->consumer->relay_minor_version < 8) {
3953 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
3954 goto end;
3955 }
3956 ret = 0;
3957
3958end:
3959 return ret;
3960}
3961
7802bae3
LL
3962static
3963int clear_metadata_file(int fd)
3964{
3965 int ret;
a5df8828 3966 off_t lseek_ret;
7802bae3 3967
a5df8828
GL
3968 lseek_ret = lseek(fd, 0, SEEK_SET);
3969 if (lseek_ret < 0) {
7802bae3 3970 PERROR("lseek");
a5df8828 3971 ret = -1;
7802bae3
LL
3972 goto end;
3973 }
3974
3975 ret = ftruncate(fd, 0);
3976 if (ret < 0) {
3977 PERROR("ftruncate");
3978 goto end;
3979 }
3980
3981end:
3982 return ret;
3983}
3984
93ec662e 3985static
eded6438 3986int ust_regenerate_metadata(struct ltt_ust_session *usess)
93ec662e
JD
3987{
3988 int ret = 0;
3989 struct buffer_reg_uid *uid_reg = NULL;
3990 struct buffer_reg_session *session_reg = NULL;
3991
3992 rcu_read_lock();
3993 cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) {
3994 struct ust_registry_session *registry;
3995 struct ust_registry_channel *chan;
3996 struct lttng_ht_iter iter_chan;
3997
3998 session_reg = uid_reg->registry;
3999 registry = session_reg->reg.ust;
4000
4001 pthread_mutex_lock(&registry->lock);
4002 registry->metadata_len_sent = 0;
4003 memset(registry->metadata, 0, registry->metadata_alloc_len);
4004 registry->metadata_len = 0;
4005 registry->metadata_version++;
7802bae3
LL
4006 if (registry->metadata_fd > 0) {
4007 /* Clear the metadata file's content. */
4008 ret = clear_metadata_file(registry->metadata_fd);
4009 if (ret) {
4010 pthread_mutex_unlock(&registry->lock);
4011 goto end;
4012 }
4013 }
4014
93ec662e
JD
4015 ret = ust_metadata_session_statedump(registry, NULL,
4016 registry->major, registry->minor);
4017 if (ret) {
4018 pthread_mutex_unlock(&registry->lock);
4019 ERR("Failed to generate session metadata (err = %d)",
4020 ret);
4021 goto end;
4022 }
4023 cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter,
4024 chan, node.node) {
4025 struct ust_registry_event *event;
4026 struct lttng_ht_iter iter_event;
4027
4028 ret = ust_metadata_channel_statedump(registry, chan);
4029 if (ret) {
4030 pthread_mutex_unlock(&registry->lock);
4031 ERR("Failed to generate channel metadata "
4032 "(err = %d)", ret);
4033 goto end;
4034 }
4035 cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter,
4036 event, node.node) {
4037 ret = ust_metadata_event_statedump(registry,
4038 chan, event);
4039 if (ret) {
4040 pthread_mutex_unlock(&registry->lock);
4041 ERR("Failed to generate event metadata "
4042 "(err = %d)", ret);
4043 goto end;
4044 }
4045 }
4046 }
4047 pthread_mutex_unlock(&registry->lock);
4048 }
4049
4050end:
4051 rcu_read_unlock();
4052 return ret;
4053}
4054
4055/*
eded6438 4056 * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library.
93ec662e
JD
4057 *
4058 * Ask the consumer to truncate the existing metadata file(s) and
4059 * then regenerate the metadata. Live and per-pid sessions are not
4060 * supported and return an error.
4061 *
4062 * Return 0 on success or else a LTTNG_ERR code.
4063 */
eded6438 4064int cmd_regenerate_metadata(struct ltt_session *session)
93ec662e
JD
4065{
4066 int ret;
4067
4068 assert(session);
4069
eded6438 4070 ret = check_regenerate_metadata_support(session);
93ec662e
JD
4071 if (ret) {
4072 goto end;
4073 }
4074
4075 if (session->kernel_session) {
eded6438 4076 ret = kernctl_session_regenerate_metadata(
93ec662e
JD
4077 session->kernel_session->fd);
4078 if (ret < 0) {
4079 ERR("Failed to regenerate the kernel metadata");
4080 goto end;
4081 }
4082 }
4083
4084 if (session->ust_session) {
eded6438 4085 ret = ust_regenerate_metadata(session->ust_session);
93ec662e
JD
4086 if (ret < 0) {
4087 ERR("Failed to regenerate the UST metadata");
4088 goto end;
4089 }
4090 }
4091 DBG("Cmd metadata regenerate for session %s", session->name);
4092 ret = LTTNG_OK;
4093
4094end:
4095 return ret;
4096}
4097
c2561365
JD
4098/*
4099 * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library.
4100 *
4101 * Ask the tracer to regenerate a new statedump.
4102 *
4103 * Return 0 on success or else a LTTNG_ERR code.
4104 */
4105int cmd_regenerate_statedump(struct ltt_session *session)
4106{
4107 int ret;
4108
4109 assert(session);
4110
4111 if (!session->active) {
4112 ret = LTTNG_ERR_SESSION_NOT_STARTED;
4113 goto end;
4114 }
c2561365
JD
4115
4116 if (session->kernel_session) {
4117 ret = kernctl_session_regenerate_statedump(
4118 session->kernel_session->fd);
4119 /*
4120 * Currently, the statedump in kernel can only fail if out
4121 * of memory.
4122 */
4123 if (ret < 0) {
4124 if (ret == -ENOMEM) {
4125 ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM;
4126 } else {
4127 ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL;
4128 }
4129 ERR("Failed to regenerate the kernel statedump");
4130 goto end;
4131 }
4132 }
4133
4134 if (session->ust_session) {
4135 ret = ust_app_regenerate_statedump_all(session->ust_session);
4136 /*
4137 * Currently, the statedump in UST always returns 0.
4138 */
4139 if (ret < 0) {
4140 ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL;
4141 ERR("Failed to regenerate the UST statedump");
4142 goto end;
4143 }
4144 }
4145 DBG("Cmd regenerate statedump for session %s", session->name);
4146 ret = LTTNG_OK;
4147
4148end:
4149 return ret;
4150}
4151
b0880ae5
JG
4152int cmd_register_trigger(struct command_ctx *cmd_ctx, int sock,
4153 struct notification_thread_handle *notification_thread)
4154{
4155 int ret;
4156 size_t trigger_len;
4157 ssize_t sock_recv_len;
4158 struct lttng_trigger *trigger = NULL;
4159 struct lttng_buffer_view view;
4160 struct lttng_dynamic_buffer trigger_buffer;
4161
4162 lttng_dynamic_buffer_init(&trigger_buffer);
4163 trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length;
4164 ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len);
4165 if (ret) {
4166 ret = LTTNG_ERR_NOMEM;
4167 goto end;
4168 }
4169
4170 sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data,
4171 trigger_len);
4172 if (sock_recv_len < 0 || sock_recv_len != trigger_len) {
4173 ERR("Failed to receive \"register trigger\" command payload");
4174 /* TODO: should this be a new error enum ? */
4175 ret = LTTNG_ERR_INVALID_TRIGGER;
4176 goto end;
4177 }
4178
4179 view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1);
4180 if (lttng_trigger_create_from_buffer(&view, &trigger) !=
4181 trigger_len) {
4182 ERR("Invalid trigger payload received in \"register trigger\" command");
4183 ret = LTTNG_ERR_INVALID_TRIGGER;
4184 goto end;
4185 }
4186
4187 ret = notification_thread_command_register_trigger(notification_thread,
4188 trigger);
587f9fd0
JG
4189 /* Ownership of trigger was transferred. */
4190 trigger = NULL;
b0880ae5 4191end:
587f9fd0 4192 lttng_trigger_destroy(trigger);
b0880ae5
JG
4193 lttng_dynamic_buffer_reset(&trigger_buffer);
4194 return ret;
4195}
4196
4197int cmd_unregister_trigger(struct command_ctx *cmd_ctx, int sock,
4198 struct notification_thread_handle *notification_thread)
4199{
4200 int ret;
4201 size_t trigger_len;
4202 ssize_t sock_recv_len;
4203 struct lttng_trigger *trigger = NULL;
4204 struct lttng_buffer_view view;
4205 struct lttng_dynamic_buffer trigger_buffer;
4206
4207 lttng_dynamic_buffer_init(&trigger_buffer);
4208 trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length;
4209 ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len);
4210 if (ret) {
4211 ret = LTTNG_ERR_NOMEM;
4212 goto end;
4213 }
4214
4215 sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data,
4216 trigger_len);
4217 if (sock_recv_len < 0 || sock_recv_len != trigger_len) {
4218 ERR("Failed to receive \"unregister trigger\" command payload");
4219 /* TODO: should this be a new error enum ? */
4220 ret = LTTNG_ERR_INVALID_TRIGGER;
4221 goto end;
4222 }
4223
4224 view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1);
4225 if (lttng_trigger_create_from_buffer(&view, &trigger) !=
4226 trigger_len) {
4227 ERR("Invalid trigger payload received in \"unregister trigger\" command");
4228 ret = LTTNG_ERR_INVALID_TRIGGER;
4229 goto end;
4230 }
4231
4232 ret = notification_thread_command_unregister_trigger(notification_thread,
4233 trigger);
4234end:
587f9fd0 4235 lttng_trigger_destroy(trigger);
b0880ae5
JG
4236 lttng_dynamic_buffer_reset(&trigger_buffer);
4237 return ret;
4238}
4239
6dc3064a
DG
4240/*
4241 * Send relayd sockets from snapshot output to consumer. Ignore request if the
4242 * snapshot output is *not* set with a remote destination.
4243 *
9a654598 4244 * Return LTTNG_OK on success or a LTTNG_ERR code.
6dc3064a 4245 */
9a654598 4246static enum lttng_error_code set_relayd_for_snapshot(
348a81dc 4247 struct consumer_output *output,
fb9a95c4 4248 const struct ltt_session *session)
6dc3064a 4249{
9a654598 4250 enum lttng_error_code status = LTTNG_OK;
6dc3064a
DG
4251 struct lttng_ht_iter iter;
4252 struct consumer_socket *socket;
1e791a74 4253 LTTNG_OPTIONAL(uint64_t) current_chunk_id = {};
6fa5fe7c 4254 const char *base_path;
6dc3064a 4255
348a81dc 4256 assert(output);
6dc3064a
DG
4257 assert(session);
4258
4259 DBG2("Set relayd object from snapshot output");
4260
1e791a74 4261 if (session->current_trace_chunk) {
348a81dc
JG
4262 enum lttng_trace_chunk_status chunk_status =
4263 lttng_trace_chunk_get_id(
4264 session->current_trace_chunk,
4265 &current_chunk_id.value);
1e791a74 4266
348a81dc 4267 if (chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK) {
1e791a74
JG
4268 current_chunk_id.is_set = true;
4269 } else {
4270 ERR("Failed to get current trace chunk id");
4271 status = LTTNG_ERR_UNK;
4272 goto error;
4273 }
4274 }
4275
6dc3064a 4276 /* Ignore if snapshot consumer output is not network. */
348a81dc 4277 if (output->type != CONSUMER_DST_NET) {
6dc3064a
DG
4278 goto error;
4279 }
4280
6fa5fe7c
MD
4281 /*
4282 * The snapshot record URI base path overrides the session
4283 * base path.
4284 */
4285 if (output->dst.net.control.subdir[0] != '\0') {
4286 base_path = output->dst.net.control.subdir;
4287 } else {
4288 base_path = session->base_path;
4289 }
4290
6dc3064a
DG
4291 /*
4292 * For each consumer socket, create and send the relayd object of the
4293 * snapshot output.
4294 */
4295 rcu_read_lock();
348a81dc 4296 cds_lfht_for_each_entry(output->socks->ht, &iter.iter,
5eecee74 4297 socket, node.node) {
ecd0f96d 4298 pthread_mutex_lock(socket->lock);
9a654598 4299 status = send_consumer_relayd_sockets(0, session->id,
348a81dc 4300 output, socket,
d3e2ba59 4301 session->name, session->hostname,
6fa5fe7c 4302 base_path,
1e791a74 4303 session->live_timer,
db1da059 4304 current_chunk_id.is_set ? &current_chunk_id.value : NULL,
46ef2188
MD
4305 session->creation_time,
4306 session->name_contains_creation_time);
ecd0f96d 4307 pthread_mutex_unlock(socket->lock);
9a654598 4308 if (status != LTTNG_OK) {
6dc3064a
DG
4309 rcu_read_unlock();
4310 goto error;
4311 }
4312 }
4313 rcu_read_unlock();
4314
4315error:
9a654598 4316 return status;
6dc3064a
DG
4317}
4318
4319/*
4320 * Record a kernel snapshot.
4321 *
fac41e72 4322 * Return LTTNG_OK on success or a LTTNG_ERR code.
6dc3064a 4323 */
fb9a95c4
JG
4324static enum lttng_error_code record_kernel_snapshot(
4325 struct ltt_kernel_session *ksess,
348a81dc 4326 const struct consumer_output *output,
fb9a95c4 4327 const struct ltt_session *session,
d07ceecd 4328 int wait, uint64_t nb_packets_per_stream)
6dc3064a 4329{
9a654598 4330 enum lttng_error_code status;
6dc3064a
DG
4331
4332 assert(ksess);
4333 assert(output);
4334 assert(session);
4335
348a81dc
JG
4336 status = kernel_snapshot_record(
4337 ksess, output, wait, nb_packets_per_stream);
9a654598 4338 return status;
6dc3064a
DG
4339}
4340
4341/*
4342 * Record a UST snapshot.
4343 *
9a654598 4344 * Returns LTTNG_OK on success or a LTTNG_ERR error code.
6dc3064a 4345 */
9a654598 4346static enum lttng_error_code record_ust_snapshot(struct ltt_ust_session *usess,
348a81dc
JG
4347 const struct consumer_output *output,
4348 const struct ltt_session *session,
4349 int wait, uint64_t nb_packets_per_stream)
6dc3064a 4350{
9a654598 4351 enum lttng_error_code status;
6dc3064a
DG
4352
4353 assert(usess);
4354 assert(output);
4355 assert(session);
4356
348a81dc
JG
4357 status = ust_app_snapshot_record(
4358 usess, output, wait, nb_packets_per_stream);
9a654598 4359 return status;
6dc3064a
DG
4360}
4361
d07ceecd 4362static
fb9a95c4
JG
4363uint64_t get_session_size_one_more_packet_per_stream(
4364 const struct ltt_session *session, uint64_t cur_nr_packets)
68808f4e 4365{
d07ceecd 4366 uint64_t tot_size = 0;
68808f4e
DG
4367
4368 if (session->kernel_session) {
4369 struct ltt_kernel_channel *chan;
fb9a95c4
JG
4370 const struct ltt_kernel_session *ksess =
4371 session->kernel_session;
68808f4e 4372
68808f4e 4373 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
d07ceecd
MD
4374 if (cur_nr_packets >= chan->channel->attr.num_subbuf) {
4375 /*
4376 * Don't take channel into account if we
4377 * already grab all its packets.
4378 */
4379 continue;
68808f4e 4380 }
d07ceecd
MD
4381 tot_size += chan->channel->attr.subbuf_size
4382 * chan->stream_count;
68808f4e
DG
4383 }
4384 }
4385
4386 if (session->ust_session) {
fb9a95c4 4387 const struct ltt_ust_session *usess = session->ust_session;
68808f4e 4388
d07ceecd
MD
4389 tot_size += ust_app_get_size_one_more_packet_per_stream(usess,
4390 cur_nr_packets);
68808f4e
DG
4391 }
4392
d07ceecd 4393 return tot_size;
68808f4e
DG
4394}
4395
5c786ded 4396/*
d07ceecd
MD
4397 * Calculate the number of packets we can grab from each stream that
4398 * fits within the overall snapshot max size.
4399 *
4400 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
4401 * the number of packets per stream.
4402 *
4403 * TODO: this approach is not perfect: we consider the worse case
4404 * (packet filling the sub-buffers) as an upper bound, but we could do
4405 * better if we do this calculation while we actually grab the packet
4406 * content: we would know how much padding we don't actually store into
4407 * the file.
4408 *
4409 * This algorithm is currently bounded by the number of packets per
4410 * stream.
4411 *
4412 * Since we call this algorithm before actually grabbing the data, it's
4413 * an approximation: for instance, applications could appear/disappear
4414 * in between this call and actually grabbing data.
5c786ded 4415 */
d07ceecd 4416static
fb9a95c4
JG
4417int64_t get_session_nb_packets_per_stream(const struct ltt_session *session,
4418 uint64_t max_size)
5c786ded 4419{
d07ceecd
MD
4420 int64_t size_left;
4421 uint64_t cur_nb_packets = 0;
5c786ded 4422
d07ceecd
MD
4423 if (!max_size) {
4424 return 0; /* Infinite */
5c786ded
JD
4425 }
4426
d07ceecd
MD
4427 size_left = max_size;
4428 for (;;) {
4429 uint64_t one_more_packet_tot_size;
5c786ded 4430
fb9a95c4
JG
4431 one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(
4432 session, cur_nb_packets);
d07ceecd
MD
4433 if (!one_more_packet_tot_size) {
4434 /* We are already grabbing all packets. */
4435 break;
4436 }
4437 size_left -= one_more_packet_tot_size;
4438 if (size_left < 0) {
4439 break;
4440 }
4441 cur_nb_packets++;
5c786ded 4442 }
d07ceecd
MD
4443 if (!cur_nb_packets) {
4444 /* Not enough room to grab one packet of each stream, error. */
4445 return -1;
4446 }
4447 return cur_nb_packets;
5c786ded
JD
4448}
4449
fb9a95c4 4450static
d2956687 4451enum lttng_error_code snapshot_record(struct ltt_session *session,
fb9a95c4
JG
4452 const struct snapshot_output *snapshot_output, int wait)
4453{
4454 int64_t nb_packets_per_stream;
d2956687 4455 char snapshot_chunk_name[LTTNG_NAME_MAX];
348a81dc
JG
4456 int ret;
4457 enum lttng_error_code ret_code = LTTNG_OK;
d2956687 4458 struct lttng_trace_chunk *snapshot_trace_chunk;
348a81dc
JG
4459 struct consumer_output *original_ust_consumer_output = NULL;
4460 struct consumer_output *original_kernel_consumer_output = NULL;
4461 struct consumer_output *snapshot_ust_consumer_output = NULL;
4462 struct consumer_output *snapshot_kernel_consumer_output = NULL;
d2956687 4463
348a81dc 4464 ret = snprintf(snapshot_chunk_name, sizeof(snapshot_chunk_name),
d2956687
JG
4465 "%s-%s-%" PRIu64,
4466 snapshot_output->name,
4467 snapshot_output->datetime,
4468 snapshot_output->nb_snapshot);
348a81dc 4469 if (ret < 0 || ret >= sizeof(snapshot_chunk_name)) {
d2956687 4470 ERR("Failed to format snapshot name");
348a81dc
JG
4471 ret_code = LTTNG_ERR_INVALID;
4472 goto error;
d2956687
JG
4473 }
4474 DBG("Recording snapshot \"%s\" for session \"%s\" with chunk name \"%s\"",
4475 snapshot_output->name, session->name,
4476 snapshot_chunk_name);
348a81dc
JG
4477 if (!session->kernel_session && !session->ust_session) {
4478 ERR("Failed to record snapshot as no channels exist");
4479 ret_code = LTTNG_ERR_NO_CHANNEL;
4480 goto error;
4481 }
4482
4483 if (session->kernel_session) {
4484 original_kernel_consumer_output =
4485 session->kernel_session->consumer;
4486 snapshot_kernel_consumer_output =
4487 consumer_copy_output(snapshot_output->consumer);
3b967712
MD
4488 strcpy(snapshot_kernel_consumer_output->chunk_path,
4489 snapshot_chunk_name);
348a81dc
JG
4490 ret = consumer_copy_sockets(snapshot_kernel_consumer_output,
4491 original_kernel_consumer_output);
4492 if (ret < 0) {
4493 ERR("Failed to copy consumer sockets from snapshot output configuration");
4494 ret_code = LTTNG_ERR_NOMEM;
4495 goto error;
4496 }
4497 ret_code = set_relayd_for_snapshot(
4498 snapshot_kernel_consumer_output, session);
4499 if (ret_code != LTTNG_OK) {
4500 ERR("Failed to setup relay daemon for kernel tracer snapshot");
4501 goto error;
4502 }
4503 session->kernel_session->consumer =
4504 snapshot_kernel_consumer_output;
4505 }
4506 if (session->ust_session) {
4507 original_ust_consumer_output = session->ust_session->consumer;
4508 snapshot_ust_consumer_output =
4509 consumer_copy_output(snapshot_output->consumer);
3b967712
MD
4510 strcpy(snapshot_ust_consumer_output->chunk_path,
4511 snapshot_chunk_name);
348a81dc
JG
4512 ret = consumer_copy_sockets(snapshot_ust_consumer_output,
4513 original_ust_consumer_output);
4514 if (ret < 0) {
4515 ERR("Failed to copy consumer sockets from snapshot output configuration");
4516 ret_code = LTTNG_ERR_NOMEM;
4517 goto error;
4518 }
4519 ret_code = set_relayd_for_snapshot(
4520 snapshot_ust_consumer_output, session);
4521 if (ret_code != LTTNG_OK) {
4522 ERR("Failed to setup relay daemon for userspace tracer snapshot");
4523 goto error;
4524 }
4525 session->ust_session->consumer =
4526 snapshot_ust_consumer_output;
4527 }
4528
d2956687 4529 snapshot_trace_chunk = session_create_new_trace_chunk(session,
348a81dc
JG
4530 snapshot_kernel_consumer_output ?:
4531 snapshot_ust_consumer_output,
4532 consumer_output_get_base_path(
4533 snapshot_output->consumer),
d2956687
JG
4534 snapshot_chunk_name);
4535 if (!snapshot_trace_chunk) {
348a81dc
JG
4536 ERR("Failed to create temporary trace chunk to record a snapshot of session \"%s\"",
4537 session->name);
4538 ret_code = LTTNG_ERR_CREATE_DIR_FAIL;
4539 goto error;
d2956687
JG
4540 }
4541 assert(!session->current_trace_chunk);
4542 ret = session_set_trace_chunk(session, snapshot_trace_chunk, NULL);
4543 lttng_trace_chunk_put(snapshot_trace_chunk);
4544 snapshot_trace_chunk = NULL;
4545 if (ret) {
348a81dc
JG
4546 ERR("Failed to set temporary trace chunk to record a snapshot of session \"%s\"",
4547 session->name);
4548 ret_code = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER;
4549 goto error;
d2956687 4550 }
fb9a95c4
JG
4551
4552 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
4553 snapshot_output->max_size);
4554 if (nb_packets_per_stream < 0) {
348a81dc
JG
4555 ret_code = LTTNG_ERR_MAX_SIZE_INVALID;
4556 goto error;
fb9a95c4
JG
4557 }
4558
4559 if (session->kernel_session) {
348a81dc
JG
4560 ret_code = record_kernel_snapshot(session->kernel_session,
4561 snapshot_kernel_consumer_output, session,
fb9a95c4 4562 wait, nb_packets_per_stream);
348a81dc
JG
4563 if (ret_code != LTTNG_OK) {
4564 goto error;
fb9a95c4
JG
4565 }
4566 }
4567
4568 if (session->ust_session) {
348a81dc
JG
4569 ret_code = record_ust_snapshot(session->ust_session,
4570 snapshot_ust_consumer_output, session,
fb9a95c4 4571 wait, nb_packets_per_stream);
348a81dc
JG
4572 if (ret_code != LTTNG_OK) {
4573 goto error;
fb9a95c4
JG
4574 }
4575 }
d2956687 4576
bbc4768c 4577 if (session_close_trace_chunk(
ecd1a12f 4578 session, session->current_trace_chunk, NULL, NULL)) {
d2956687
JG
4579 /*
4580 * Don't goto end; make sure the chunk is closed for the session
4581 * to allow future snapshots.
4582 */
4583 ERR("Failed to close snapshot trace chunk of session \"%s\"",
4584 session->name);
348a81dc 4585 ret_code = LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER;
d2956687
JG
4586 }
4587 if (session_set_trace_chunk(session, NULL, NULL)) {
4588 ERR("Failed to release the current trace chunk of session \"%s\"",
4589 session->name);
348a81dc 4590 ret_code = LTTNG_ERR_UNK;
d2956687 4591 }
348a81dc
JG
4592error:
4593 if (original_ust_consumer_output) {
4594 session->ust_session->consumer = original_ust_consumer_output;
4595 }
4596 if (original_kernel_consumer_output) {
4597 session->kernel_session->consumer =
4598 original_kernel_consumer_output;
4599 }
4600 consumer_output_put(snapshot_ust_consumer_output);
4601 consumer_output_put(snapshot_kernel_consumer_output);
4602 return ret_code;
fb9a95c4
JG
4603}
4604
6dc3064a
DG
4605/*
4606 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
4607 *
4608 * The wait parameter is ignored so this call always wait for the snapshot to
4609 * complete before returning.
4610 *
4611 * Return LTTNG_OK on success or else a LTTNG_ERR code.
4612 */
4613int cmd_snapshot_record(struct ltt_session *session,
df4f5a87 4614 const struct lttng_snapshot_output *output, int wait)
6dc3064a 4615{
9a654598
JG
4616 enum lttng_error_code cmd_ret = LTTNG_OK;
4617 int ret;
00e1dfc4 4618 unsigned int snapshot_success = 0;
10ba83fe 4619 char datetime[16];
2abe7969 4620 struct snapshot_output *tmp_output = NULL;
6dc3064a
DG
4621
4622 assert(session);
ba45d9f0 4623 assert(output);
6dc3064a
DG
4624
4625 DBG("Cmd snapshot record for session %s", session->name);
4626
10ba83fe
JR
4627 /* Get the datetime for the snapshot output directory. */
4628 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime,
4629 sizeof(datetime));
4630 if (!ret) {
9a654598 4631 cmd_ret = LTTNG_ERR_INVALID;
10ba83fe
JR
4632 goto error;
4633 }
4634
6dc3064a 4635 /*
d3f14b8a
MD
4636 * Permission denied to create an output if the session is not
4637 * set in no output mode.
6dc3064a
DG
4638 */
4639 if (session->output_traces) {
9a654598 4640 cmd_ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
6dc3064a
DG
4641 goto error;
4642 }
4643
4644 /* The session needs to be started at least once. */
8382cf6f 4645 if (!session->has_been_started) {
9a654598 4646 cmd_ret = LTTNG_ERR_START_SESSION_ONCE;
6dc3064a
DG
4647 goto error;
4648 }
4649
4650 /* Use temporary output for the session. */
ba45d9f0 4651 if (*output->ctrl_url != '\0') {
2abe7969
JG
4652 tmp_output = snapshot_output_alloc();
4653 if (!tmp_output) {
4654 cmd_ret = LTTNG_ERR_NOMEM;
4655 goto error;
4656 }
4657
b178f53e
JG
4658 ret = snapshot_output_init(session, output->max_size,
4659 output->name,
4660 output->ctrl_url, output->data_url,
4661 session->consumer,
2abe7969 4662 tmp_output, NULL);
6dc3064a
DG
4663 if (ret < 0) {
4664 if (ret == -ENOMEM) {
9a654598 4665 cmd_ret = LTTNG_ERR_NOMEM;
6dc3064a 4666 } else {
9a654598 4667 cmd_ret = LTTNG_ERR_INVALID;
6dc3064a
DG
4668 }
4669 goto error;
4670 }
1bfe7328 4671 /* Use the global session count for the temporary snapshot. */
2abe7969 4672 tmp_output->nb_snapshot = session->snapshot.nb_snapshot;
10ba83fe
JR
4673
4674 /* Use the global datetime */
2abe7969
JG
4675 memcpy(tmp_output->datetime, datetime, sizeof(datetime));
4676 cmd_ret = snapshot_record(session, tmp_output, wait);
fb9a95c4 4677 if (cmd_ret != LTTNG_OK) {
804c90a8
JR
4678 goto error;
4679 }
804c90a8
JR
4680 snapshot_success = 1;
4681 } else {
4682 struct snapshot_output *sout;
4683 struct lttng_ht_iter iter;
68808f4e 4684
804c90a8
JR
4685 rcu_read_lock();
4686 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
4687 &iter.iter, sout, node.node) {
2abe7969
JG
4688 struct snapshot_output output_copy;
4689
804c90a8 4690 /*
2abe7969
JG
4691 * Make a local copy of the output and override output
4692 * parameters with those provided as part of the
4693 * command.
804c90a8 4694 */
2abe7969 4695 memcpy(&output_copy, sout, sizeof(output_copy));
1bfe7328 4696
804c90a8 4697 if (output->max_size != (uint64_t) -1ULL) {
2abe7969 4698 output_copy.max_size = output->max_size;
6dc3064a 4699 }
d07ceecd 4700
2abe7969
JG
4701 output_copy.nb_snapshot = session->snapshot.nb_snapshot;
4702 memcpy(output_copy.datetime, datetime,
4703 sizeof(datetime));
6dc3064a 4704
804c90a8
JR
4705 /* Use temporary name. */
4706 if (*output->name != '\0') {
2abe7969
JG
4707 if (lttng_strncpy(output_copy.name,
4708 output->name,
4709 sizeof(output_copy.name))) {
9a654598 4710 cmd_ret = LTTNG_ERR_INVALID;
cf3e357d
MD
4711 rcu_read_unlock();
4712 goto error;
4713 }
804c90a8 4714 }
e1986656 4715
2abe7969 4716 cmd_ret = snapshot_record(session, &output_copy, wait);
fb9a95c4
JG
4717 if (cmd_ret != LTTNG_OK) {
4718 rcu_read_unlock();
4719 goto error;
6dc3064a 4720 }
804c90a8 4721 snapshot_success = 1;
6dc3064a 4722 }
804c90a8 4723 rcu_read_unlock();
6dc3064a
DG
4724 }
4725
1bfe7328
DG
4726 if (snapshot_success) {
4727 session->snapshot.nb_snapshot++;
b67578cb 4728 } else {
9a654598 4729 cmd_ret = LTTNG_ERR_SNAPSHOT_FAIL;
1bfe7328
DG
4730 }
4731
6dc3064a 4732error:
2abe7969
JG
4733 if (tmp_output) {
4734 snapshot_output_destroy(tmp_output);
4735 }
9a654598 4736 return cmd_ret;
6dc3064a
DG
4737}
4738
d7ba1388
MD
4739/*
4740 * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
4741 */
4742int cmd_set_session_shm_path(struct ltt_session *session,
4743 const char *shm_path)
4744{
4745 /* Safety net */
4746 assert(session);
4747
4748 /*
4749 * Can only set shm path before session is started.
4750 */
4751 if (session->has_been_started) {
4752 return LTTNG_ERR_SESSION_STARTED;
4753 }
4754
4755 strncpy(session->shm_path, shm_path,
4756 sizeof(session->shm_path));
4757 session->shm_path[sizeof(session->shm_path) - 1] = '\0';
4758
4759 return 0;
4760}
4761
5c408ad8
JD
4762/*
4763 * Command LTTNG_ROTATE_SESSION from the lttng-ctl library.
4764 *
4765 * Ask the consumer to rotate the session output directory.
4766 * The session lock must be held.
4767 *
d5a1b7aa 4768 * Returns LTTNG_OK on success or else a negative LTTng error code.
5c408ad8
JD
4769 */
4770int cmd_rotate_session(struct ltt_session *session,
7fdbed1c
JG
4771 struct lttng_rotate_session_return *rotate_return,
4772 bool quiet_rotation)
5c408ad8
JD
4773{
4774 int ret;
d2956687 4775 uint64_t ongoing_rotation_chunk_id;
d5a1b7aa 4776 enum lttng_error_code cmd_ret = LTTNG_OK;
d2956687
JG
4777 struct lttng_trace_chunk *chunk_being_archived = NULL;
4778 struct lttng_trace_chunk *new_trace_chunk = NULL;
4779 enum lttng_trace_chunk_status chunk_status;
5c408ad8
JD
4780
4781 assert(session);
4782
4783 if (!session->has_been_started) {
d5a1b7aa 4784 cmd_ret = LTTNG_ERR_START_SESSION_ONCE;
d68c9a04 4785 goto end;
5c408ad8
JD
4786 }
4787
d48d65e1
MD
4788 /*
4789 * Explicit rotation is not supported for live sessions.
4790 * However, live sessions can perform a quiet rotation on
4791 * destroy.
4792 * Rotation is not supported for snapshot traces (no output).
4793 */
4794 if ((!quiet_rotation && session->live_timer) ||
4795 !session->output_traces) {
d5a1b7aa 4796 cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE;
d68c9a04 4797 goto end;
5c408ad8
JD
4798 }
4799
d2956687 4800 /* Unsupported feature in lttng-relayd before 2.11. */
070b6a86 4801 if (!quiet_rotation && session->consumer->type == CONSUMER_DST_NET &&
5c408ad8
JD
4802 (session->consumer->relay_major_version == 2 &&
4803 session->consumer->relay_minor_version < 11)) {
d5a1b7aa 4804 cmd_ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY;
d68c9a04 4805 goto end;
5c408ad8
JD
4806 }
4807
92816cc3 4808 if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
92816cc3
JG
4809 DBG("Refusing to launch a rotation; a rotation is already in progress for session %s",
4810 session->name);
d5a1b7aa 4811 cmd_ret = LTTNG_ERR_ROTATION_PENDING;
d68c9a04 4812 goto end;
5c408ad8
JD
4813 }
4814
4815 /*
4816 * After a stop, we only allow one rotation to occur, the other ones are
4817 * useless until a new start.
4818 */
4819 if (session->rotated_after_last_stop) {
4820 DBG("Session \"%s\" was already rotated after stop, refusing rotation",
4821 session->name);
d5a1b7aa 4822 cmd_ret = LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP;
d68c9a04 4823 goto end;
5c408ad8
JD
4824 }
4825
d2956687 4826 session->rotation_state = LTTNG_ROTATION_STATE_ONGOING;
92816cc3 4827
d2956687 4828 if (session->active) {
348a81dc 4829 new_trace_chunk = session_create_new_trace_chunk(session, NULL,
d2956687
JG
4830 NULL, NULL);
4831 if (!new_trace_chunk) {
4832 cmd_ret = LTTNG_ERR_CREATE_DIR_FAIL;
4833 goto error;
5c408ad8 4834 }
d2956687 4835 }
2961f09e 4836
d2956687
JG
4837 /* The current trace chunk becomes the chunk being archived. */
4838 ret = session_set_trace_chunk(session, new_trace_chunk,
4839 &chunk_being_archived);
4840 if (ret) {
4841 cmd_ret = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER;
b178f53e
JG
4842 goto error;
4843 }
4844
d2956687
JG
4845 assert(chunk_being_archived);
4846 chunk_status = lttng_trace_chunk_get_id(chunk_being_archived,
4847 &ongoing_rotation_chunk_id);
4848 assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
4849
5c408ad8 4850 if (session->kernel_session) {
d5a1b7aa
JG
4851 cmd_ret = kernel_rotate_session(session);
4852 if (cmd_ret != LTTNG_OK) {
2961f09e 4853 goto error;
5c408ad8
JD
4854 }
4855 }
4856 if (session->ust_session) {
d5a1b7aa
JG
4857 cmd_ret = ust_app_rotate_session(session);
4858 if (cmd_ret != LTTNG_OK) {
2961f09e 4859 goto error;
5c408ad8 4860 }
92816cc3 4861 }
17dd1232 4862
bbc4768c 4863 ret = session_close_trace_chunk(session, chunk_being_archived,
7fdbed1c
JG
4864 quiet_rotation ?
4865 NULL :
4866 &((enum lttng_trace_chunk_command_type){
ecd1a12f
MD
4867 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED}),
4868 session->last_chunk_path);
d2956687
JG
4869 if (ret) {
4870 cmd_ret = LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER;
4871 goto error;
4872 }
4873
7fdbed1c 4874 session->quiet_rotation = quiet_rotation;
92816cc3
JG
4875 ret = timer_session_rotation_pending_check_start(session,
4876 DEFAULT_ROTATE_PENDING_TIMER);
4877 if (ret) {
d5a1b7aa 4878 cmd_ret = LTTNG_ERR_UNK;
2961f09e 4879 goto error;
5c408ad8
JD
4880 }
4881
4882 if (!session->active) {
4883 session->rotated_after_last_stop = true;
4884 }
4885
4886 if (rotate_return) {
d2956687 4887 rotate_return->rotation_id = ongoing_rotation_chunk_id;
5c408ad8
JD
4888 }
4889
d2956687
JG
4890 session->chunk_being_archived = chunk_being_archived;
4891 chunk_being_archived = NULL;
7fdbed1c
JG
4892 if (!quiet_rotation) {
4893 ret = notification_thread_command_session_rotation_ongoing(
4894 notification_thread_handle,
4895 session->name, session->uid, session->gid,
4896 ongoing_rotation_chunk_id);
4897 if (ret != LTTNG_OK) {
4898 ERR("Failed to notify notification thread that a session rotation is ongoing for session %s",
4899 session->name);
4900 cmd_ret = ret;
4901 }
2961f09e
JG
4902 }
4903
92816cc3 4904 DBG("Cmd rotate session %s, archive_id %" PRIu64 " sent",
d2956687 4905 session->name, ongoing_rotation_chunk_id);
5c408ad8 4906end:
d2956687
JG
4907 lttng_trace_chunk_put(new_trace_chunk);
4908 lttng_trace_chunk_put(chunk_being_archived);
d5a1b7aa 4909 ret = (cmd_ret == LTTNG_OK) ? cmd_ret : -((int) cmd_ret);
5c408ad8 4910 return ret;
2961f09e 4911error:
2961f09e 4912 if (session_reset_rotation_state(session,
d2956687 4913 LTTNG_ROTATION_STATE_ERROR)) {
2961f09e
JG
4914 ERR("Failed to reset rotation state of session \"%s\"",
4915 session->name);
4916 }
4917 goto end;
5c408ad8
JD
4918}
4919
4920/*
d68c9a04 4921 * Command LTTNG_ROTATION_GET_INFO from the lttng-ctl library.
5c408ad8
JD
4922 *
4923 * Check if the session has finished its rotation.
4924 *
d2956687 4925 * Return LTTNG_OK on success or else an LTTNG_ERR code.
5c408ad8 4926 */
d68c9a04
JD
4927int cmd_rotate_get_info(struct ltt_session *session,
4928 struct lttng_rotation_get_info_return *info_return,
4929 uint64_t rotation_id)
5c408ad8 4930{
d2956687
JG
4931 enum lttng_error_code cmd_ret = LTTNG_OK;
4932 enum lttng_rotation_state rotation_state;
5c408ad8 4933
d68c9a04 4934 DBG("Cmd rotate_get_info session %s, rotation id %" PRIu64, session->name,
d2956687 4935 session->most_recent_chunk_id.value);
5c408ad8 4936
d2956687
JG
4937 if (session->chunk_being_archived) {
4938 enum lttng_trace_chunk_status chunk_status;
4939 uint64_t chunk_id;
4940
4941 chunk_status = lttng_trace_chunk_get_id(
4942 session->chunk_being_archived,
4943 &chunk_id);
4944 assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK);
4945
4946 rotation_state = rotation_id == chunk_id ?
4947 LTTNG_ROTATION_STATE_ONGOING :
4948 LTTNG_ROTATION_STATE_EXPIRED;
4949 } else {
4950 if (session->last_archived_chunk_id.is_set &&
4951 rotation_id != session->last_archived_chunk_id.value) {
4952 rotation_state = LTTNG_ROTATION_STATE_EXPIRED;
4953 } else {
4954 rotation_state = session->rotation_state;
4955 }
5c408ad8
JD
4956 }
4957
d2956687
JG
4958 switch (rotation_state) {
4959 case LTTNG_ROTATION_STATE_NO_ROTATION:
4960 DBG("Reporting that no rotation has occured within the lifetime of session \"%s\"",
4961 session->name);
4962 goto end;
4963 case LTTNG_ROTATION_STATE_EXPIRED:
4964 DBG("Reporting that the rotation state of rotation id %" PRIu64 " of session \"%s\" has expired",
4965 rotation_id, session->name);
4966 break;
d68c9a04 4967 case LTTNG_ROTATION_STATE_ONGOING:
d2956687 4968 DBG("Reporting that rotation id %" PRIu64 " of session \"%s\" is still pending",
d68c9a04
JD
4969 rotation_id, session->name);
4970 break;
4971 case LTTNG_ROTATION_STATE_COMPLETED:
dd73d57b 4972 {
d2956687
JG
4973 int fmt_ret;
4974 char *chunk_path;
dd73d57b
JG
4975 char *current_tracing_path_reply;
4976 size_t current_tracing_path_reply_len;
4977
d2956687
JG
4978 DBG("Reporting that rotation id %" PRIu64 " of session \"%s\" is completed",
4979 rotation_id, session->name);
4980
dd73d57b
JG
4981 switch (session_get_consumer_destination_type(session)) {
4982 case CONSUMER_DST_LOCAL:
4983 current_tracing_path_reply =
4984 info_return->location.local.absolute_path;
4985 current_tracing_path_reply_len =
4986 sizeof(info_return->location.local.absolute_path);
4987 info_return->location_type =
05f8afa9 4988 (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL;
ecd1a12f
MD
4989 fmt_ret = asprintf(&chunk_path,
4990 "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY "/%s",
4991 session_get_base_path(session),
4992 session->last_archived_chunk_name);
4993 if (fmt_ret == -1) {
4994 PERROR("Failed to format the path of the last archived trace chunk");
4995 info_return->status = LTTNG_ROTATION_STATUS_ERROR;
4996 cmd_ret = LTTNG_ERR_UNK;
4997 goto end;
4998 }
dd73d57b
JG
4999 break;
5000 case CONSUMER_DST_NET:
09cfbe47
JG
5001 {
5002 uint16_t ctrl_port, data_port;
5003
dd73d57b
JG
5004 current_tracing_path_reply =
5005 info_return->location.relay.relative_path;
5006 current_tracing_path_reply_len =
5007 sizeof(info_return->location.relay.relative_path);
5008 /* Currently the only supported relay protocol. */
5009 info_return->location.relay.protocol =
05f8afa9 5010 (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP;
dd73d57b 5011
d2956687 5012 fmt_ret = lttng_strncpy(info_return->location.relay.host,
dd73d57b
JG
5013 session_get_net_consumer_hostname(session),
5014 sizeof(info_return->location.relay.host));
d2956687
JG
5015 if (fmt_ret) {
5016 ERR("Failed to copy host name to rotate_get_info reply");
dd73d57b 5017 info_return->status = LTTNG_ROTATION_STATUS_ERROR;
d2956687 5018 cmd_ret = LTTNG_ERR_SET_URL;
dd73d57b
JG
5019 goto end;
5020 }
5021
09cfbe47
JG
5022 session_get_net_consumer_ports(session, &ctrl_port, &data_port);
5023 info_return->location.relay.ports.control = ctrl_port;
5024 info_return->location.relay.ports.data = data_port;
dd73d57b 5025 info_return->location_type =
05f8afa9 5026 (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY;
ecd1a12f
MD
5027 chunk_path = strdup(session->last_chunk_path);
5028 if (!chunk_path) {
5029 ERR("Failed to allocate the path of the last archived trace chunk");
5030 info_return->status = LTTNG_ROTATION_STATUS_ERROR;
5031 cmd_ret = LTTNG_ERR_UNK;
5032 goto end;
5033 }
dd73d57b 5034 break;
09cfbe47 5035 }
dd73d57b
JG
5036 default:
5037 abort();
5038 }
d2956687
JG
5039
5040 fmt_ret = lttng_strncpy(current_tracing_path_reply,
5041 chunk_path, current_tracing_path_reply_len);
5042 free(chunk_path);
5043 if (fmt_ret) {
5044 ERR("Failed to copy path of the last archived trace chunk to rotate_get_info reply");
d68c9a04 5045 info_return->status = LTTNG_ROTATION_STATUS_ERROR;
d2956687 5046 cmd_ret = LTTNG_ERR_UNK;
5c408ad8
JD
5047 goto end;
5048 }
dd73d57b 5049
d68c9a04 5050 break;
dd73d57b 5051 }
d68c9a04 5052 case LTTNG_ROTATION_STATE_ERROR:
d2956687 5053 DBG("Reporting that an error occurred during rotation %" PRIu64 " of session \"%s\"",
d68c9a04
JD
5054 rotation_id, session->name);
5055 break;
5056 default:
5057 abort();
5c408ad8
JD
5058 }
5059
d2956687 5060 cmd_ret = LTTNG_OK;
5c408ad8 5061end:
d2956687
JG
5062 info_return->status = (int32_t) rotation_state;
5063 return cmd_ret;
5c408ad8
JD
5064}
5065
259c2674
JD
5066/*
5067 * Command LTTNG_ROTATION_SET_SCHEDULE from the lttng-ctl library.
5068 *
5069 * Configure the automatic rotation parameters.
66ea93b1
JG
5070 * 'activate' to true means activate the rotation schedule type with 'new_value'.
5071 * 'activate' to false means deactivate the rotation schedule and validate that
5072 * 'new_value' has the same value as the currently active value.
259c2674 5073 *
66ea93b1 5074 * Return 0 on success or else a positive LTTNG_ERR code.
259c2674
JD
5075 */
5076int cmd_rotation_set_schedule(struct ltt_session *session,
66ea93b1
JG
5077 bool activate, enum lttng_rotation_schedule_type schedule_type,
5078 uint64_t new_value,
90936dcf 5079 struct notification_thread_handle *notification_thread_handle)
259c2674
JD
5080{
5081 int ret;
66ea93b1 5082 uint64_t *parameter_value;
259c2674
JD
5083
5084 assert(session);
5085
5086 DBG("Cmd rotate set schedule session %s", session->name);
5087
92fe5ca1 5088 if (session->live_timer || !session->output_traces) {
66ea93b1 5089 DBG("Failing ROTATION_SET_SCHEDULE command as the rotation feature is not available for this session");
259c2674
JD
5090 ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE;
5091 goto end;
5092 }
5093
66ea93b1
JG
5094 switch (schedule_type) {
5095 case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD:
5096 parameter_value = &session->rotate_size;
5097 break;
5098 case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC:
5099 parameter_value = &session->rotate_timer_period;
5100 if (new_value >= UINT_MAX) {
5101 DBG("Failing ROTATION_SET_SCHEDULE command as the value requested for a periodic rotation schedule is invalid: %" PRIu64 " > %u (UINT_MAX)",
5102 new_value, UINT_MAX);
5103 ret = LTTNG_ERR_INVALID;
5104 goto end;
5105 }
5106 break;
5107 default:
5108 WARN("Failing ROTATION_SET_SCHEDULE command on unknown schedule type");
5109 ret = LTTNG_ERR_INVALID;
259c2674 5110 goto end;
66ea93b1
JG
5111 }
5112
5113 /* Improper use of the API. */
5114 if (new_value == -1ULL) {
5115 WARN("Failing ROTATION_SET_SCHEDULE command as the value requested is -1");
5116 ret = LTTNG_ERR_INVALID;
259c2674
JD
5117 goto end;
5118 }
5119
66ea93b1
JG
5120 /*
5121 * As indicated in struct ltt_session's comments, a value of == 0 means
5122 * this schedule rotation type is not in use.
5123 *
5124 * Reject the command if we were asked to activate a schedule that was
5125 * already active.
5126 */
5127 if (activate && *parameter_value != 0) {
5128 DBG("Failing ROTATION_SET_SCHEDULE (activate) command as the schedule is already active");
5129 ret = LTTNG_ERR_ROTATION_SCHEDULE_SET;
90936dcf 5130 goto end;
66ea93b1
JG
5131 }
5132
5133 /*
5134 * Reject the command if we were asked to deactivate a schedule that was
5135 * not active.
5136 */
5137 if (!activate && *parameter_value == 0) {
5138 DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as the schedule is already inactive");
5139 ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET;
90936dcf
JD
5140 goto end;
5141 }
5142
66ea93b1
JG
5143 /*
5144 * Reject the command if we were asked to deactivate a schedule that
5145 * doesn't exist.
5146 */
5147 if (!activate && *parameter_value != new_value) {
5148 DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as an inexistant schedule was provided");
5149 ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET;
5150 goto end;
5151 }
259c2674 5152
66ea93b1
JG
5153 *parameter_value = activate ? new_value : 0;
5154
5155 switch (schedule_type) {
5156 case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC:
5157 if (activate && session->active) {
5158 /*
5159 * Only start the timer if the session is active,
5160 * otherwise it will be started when the session starts.
5161 */
92816cc3
JG
5162 ret = timer_session_rotation_schedule_timer_start(
5163 session, new_value);
259c2674 5164 if (ret) {
66ea93b1 5165 ERR("Failed to enable session rotation timer in ROTATION_SET_SCHEDULE command");
259c2674
JD
5166 ret = LTTNG_ERR_UNK;
5167 goto end;
5168 }
66ea93b1 5169 } else {
92816cc3
JG
5170 ret = timer_session_rotation_schedule_timer_stop(
5171 session);
66ea93b1
JG
5172 if (ret) {
5173 ERR("Failed to disable session rotation timer in ROTATION_SET_SCHEDULE command");
5174 ret = LTTNG_ERR_UNK;
f3ce6946 5175 goto end;
66ea93b1 5176 }
259c2674 5177 }
66ea93b1
JG
5178 break;
5179 case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD:
5180 if (activate) {
5181 ret = subscribe_session_consumed_size_rotation(session,
5182 new_value, notification_thread_handle);
90936dcf 5183 if (ret) {
66ea93b1 5184 ERR("Failed to enable consumed-size notification in ROTATION_SET_SCHEDULE command");
90936dcf
JD
5185 ret = LTTNG_ERR_UNK;
5186 goto end;
5187 }
90936dcf 5188 } else {
66ea93b1
JG
5189 ret = unsubscribe_session_consumed_size_rotation(session,
5190 notification_thread_handle);
90936dcf 5191 if (ret) {
66ea93b1 5192 ERR("Failed to disable consumed-size notification in ROTATION_SET_SCHEDULE command");
90936dcf
JD
5193 ret = LTTNG_ERR_UNK;
5194 goto end;
5195 }
66ea93b1 5196
90936dcf 5197 }
66ea93b1
JG
5198 break;
5199 default:
5200 /* Would have been caught before. */
5201 abort();
90936dcf
JD
5202 }
5203
259c2674
JD
5204 ret = LTTNG_OK;
5205
5206 goto end;
5207
5208end:
5209 return ret;
5210}
5211
a503e1ef
JG
5212/* Wait for a given path to be removed before continuing. */
5213static enum lttng_error_code wait_on_path(void *path_data)
5214{
5215 const char *shm_path = path_data;
5216
5217 DBG("Waiting for the shm path at %s to be removed before completing session destruction",
5218 shm_path);
5219 while (true) {
5220 int ret;
5221 struct stat st;
5222
5223 ret = stat(shm_path, &st);
5224 if (ret) {
5225 if (errno != ENOENT) {
5226 PERROR("stat() returned an error while checking for the existence of the shm path");
5227 } else {
5228 DBG("shm path no longer exists, completing the destruction of session");
5229 }
5230 break;
5231 } else {
5232 if (!S_ISDIR(st.st_mode)) {
5233 ERR("The type of shm path %s returned by stat() is not a directory; aborting the wait for shm path removal",
5234 shm_path);
5235 break;
5236 }
5237 }
5238 usleep(SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US);
5239 }
5240 return LTTNG_OK;
5241}
5242
5243/*
5244 * Returns a pointer to a handler to run on completion of a command.
5245 * Returns NULL if no handler has to be run for the last command executed.
5246 */
5247const struct cmd_completion_handler *cmd_pop_completion_handler(void)
5248{
5249 struct cmd_completion_handler *handler = current_completion_handler;
5250
5251 current_completion_handler = NULL;
5252 return handler;
5253}
5254
2f77fc4b
DG
5255/*
5256 * Init command subsystem.
5257 */
5258void cmd_init(void)
5259{
5260 /*
d88aee68
DG
5261 * Set network sequence index to 1 for streams to match a relayd
5262 * socket on the consumer side.
2f77fc4b 5263 */
d88aee68
DG
5264 pthread_mutex_lock(&relayd_net_seq_idx_lock);
5265 relayd_net_seq_idx = 1;
5266 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
5267
5268 DBG("Command subsystem initialized");
5269}
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