Fix: illegal memory access in cmd_snapshot_list_outputs
[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
CommitLineData
2f77fc4b
DG
1/*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
bdf64013 3 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
2f77fc4b
DG
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License, version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 51
16 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
6c1c0768 19#define _LGPL_SOURCE
2f77fc4b 20#include <assert.h>
6dc3064a 21#include <inttypes.h>
2f77fc4b
DG
22#include <urcu/list.h>
23#include <urcu/uatomic.h>
24
25#include <common/defaults.h>
26#include <common/common.h>
27#include <common/sessiond-comm/sessiond-comm.h>
28#include <common/relayd/relayd.h>
10a50311 29#include <common/utils.h>
f5436bfc 30#include <common/compat/string.h>
93ec662e 31#include <common/kernel-ctl/kernel-ctl.h>
2f77fc4b
DG
32
33#include "channel.h"
34#include "consumer.h"
35#include "event.h"
8782cc74 36#include "health-sessiond.h"
2f77fc4b
DG
37#include "kernel.h"
38#include "kernel-consumer.h"
39#include "lttng-sessiond.h"
40#include "utils.h"
834978fd 41#include "syscall.h"
7c1d2758 42#include "agent.h"
93ec662e 43#include "buffer-registry.h"
2f77fc4b
DG
44
45#include "cmd.h"
46
47/*
48 * Used to keep a unique index for each relayd socket created where this value
49 * is associated with streams on the consumer so it can match the right relayd
d88aee68
DG
50 * to send to. It must be accessed with the relayd_net_seq_idx_lock
51 * held.
2f77fc4b 52 */
d88aee68
DG
53static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
54static uint64_t relayd_net_seq_idx;
2f77fc4b 55
7076b56e
JG
56static int validate_event_name(const char *);
57static int validate_ust_event_name(const char *);
58static int cmd_enable_event_internal(struct ltt_session *session,
59 struct lttng_domain *domain,
60 char *channel_name, struct lttng_event *event,
61 char *filter_expression,
62 struct lttng_filter_bytecode *filter,
63 struct lttng_event_exclusion *exclusion,
64 int wpipe);
65
2f77fc4b
DG
66/*
67 * Create a session path used by list_lttng_sessions for the case that the
68 * session consumer is on the network.
69 */
70static int build_network_session_path(char *dst, size_t size,
71 struct ltt_session *session)
72{
73 int ret, kdata_port, udata_port;
74 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
75 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
76
77 assert(session);
78 assert(dst);
79
80 memset(tmp_urls, 0, sizeof(tmp_urls));
81 memset(tmp_uurl, 0, sizeof(tmp_uurl));
82
83 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
84
85 if (session->kernel_session && session->kernel_session->consumer) {
86 kuri = &session->kernel_session->consumer->dst.net.control;
87 kdata_port = session->kernel_session->consumer->dst.net.data.port;
88 }
89
90 if (session->ust_session && session->ust_session->consumer) {
91 uuri = &session->ust_session->consumer->dst.net.control;
92 udata_port = session->ust_session->consumer->dst.net.data.port;
93 }
94
95 if (uuri == NULL && kuri == NULL) {
96 uri = &session->consumer->dst.net.control;
97 kdata_port = session->consumer->dst.net.data.port;
98 } else if (kuri && uuri) {
99 ret = uri_compare(kuri, uuri);
100 if (ret) {
101 /* Not Equal */
102 uri = kuri;
103 /* Build uuri URL string */
104 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
105 if (ret < 0) {
106 goto error;
107 }
108 } else {
109 uri = kuri;
110 }
111 } else if (kuri && uuri == NULL) {
112 uri = kuri;
113 } else if (uuri && kuri == NULL) {
114 uri = uuri;
115 }
116
117 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
118 if (ret < 0) {
119 goto error;
120 }
121
9aa9f900
DG
122 /*
123 * Do we have a UST url set. If yes, this means we have both kernel and UST
124 * to print.
125 */
9d035200 126 if (*tmp_uurl != '\0') {
2f77fc4b
DG
127 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
128 tmp_urls, kdata_port, tmp_uurl, udata_port);
129 } else {
9aa9f900 130 int dport;
bef08707 131 if (kuri || (!kuri && !uuri)) {
9aa9f900
DG
132 dport = kdata_port;
133 } else {
134 /* No kernel URI, use the UST port. */
135 dport = udata_port;
136 }
137 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
2f77fc4b
DG
138 }
139
140error:
141 return ret;
142}
143
fb83fe64
JD
144/*
145 * Get run-time attributes if the session has been started (discarded events,
146 * lost packets).
147 */
148static int get_kernel_runtime_stats(struct ltt_session *session,
149 struct ltt_kernel_channel *kchan, uint64_t *discarded_events,
150 uint64_t *lost_packets)
151{
152 int ret;
153
154 if (!session->has_been_started) {
155 ret = 0;
156 *discarded_events = 0;
157 *lost_packets = 0;
158 goto end;
159 }
160
161 ret = consumer_get_discarded_events(session->id, kchan->fd,
162 session->kernel_session->consumer,
163 discarded_events);
164 if (ret < 0) {
165 goto end;
166 }
167
168 ret = consumer_get_lost_packets(session->id, kchan->fd,
169 session->kernel_session->consumer,
170 lost_packets);
171 if (ret < 0) {
172 goto end;
173 }
174
175end:
176 return ret;
177}
178
179/*
180 * Get run-time attributes if the session has been started (discarded events,
181 * lost packets).
182 */
183static int get_ust_runtime_stats(struct ltt_session *session,
184 struct ltt_ust_channel *uchan, uint64_t *discarded_events,
185 uint64_t *lost_packets)
186{
187 int ret;
188 struct ltt_ust_session *usess;
189
a91c5803
JG
190 if (!discarded_events || !lost_packets) {
191 ret = -1;
192 goto end;
193 }
194
fb83fe64 195 usess = session->ust_session;
a905c624
JG
196 assert(discarded_events);
197 assert(lost_packets);
fb83fe64
JD
198
199 if (!usess || !session->has_been_started) {
200 *discarded_events = 0;
201 *lost_packets = 0;
202 ret = 0;
203 goto end;
204 }
205
206 if (usess->buffer_type == LTTNG_BUFFER_PER_UID) {
207 ret = ust_app_uid_get_channel_runtime_stats(usess->id,
208 &usess->buffer_reg_uid_list,
209 usess->consumer, uchan->id,
210 uchan->attr.overwrite,
211 discarded_events,
212 lost_packets);
213 } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) {
214 ret = ust_app_pid_get_channel_runtime_stats(usess,
215 uchan, usess->consumer,
216 uchan->attr.overwrite,
217 discarded_events,
218 lost_packets);
219 if (ret < 0) {
220 goto end;
221 }
222 *discarded_events += uchan->per_pid_closed_app_discarded;
223 *lost_packets += uchan->per_pid_closed_app_lost;
224 } else {
225 ERR("Unsupported buffer type");
967bc289 226 assert(0);
fb83fe64
JD
227 ret = -1;
228 goto end;
229 }
230
231end:
232 return ret;
233}
234
2f77fc4b
DG
235/*
236 * Fill lttng_channel array of all channels.
237 */
56a37563 238static void list_lttng_channels(enum lttng_domain_type domain,
fb83fe64
JD
239 struct ltt_session *session, struct lttng_channel *channels,
240 struct lttcomm_channel_extended *chan_exts)
2f77fc4b 241{
fb83fe64 242 int i = 0, ret;
2f77fc4b
DG
243 struct ltt_kernel_channel *kchan;
244
245 DBG("Listing channels for session %s", session->name);
246
247 switch (domain) {
248 case LTTNG_DOMAIN_KERNEL:
249 /* Kernel channels */
250 if (session->kernel_session != NULL) {
251 cds_list_for_each_entry(kchan,
252 &session->kernel_session->channel_list.head, list) {
fb83fe64
JD
253 uint64_t discarded_events, lost_packets;
254
255 ret = get_kernel_runtime_stats(session, kchan,
256 &discarded_events, &lost_packets);
257 if (ret < 0) {
258 goto end;
259 }
2f77fc4b
DG
260 /* Copy lttng_channel struct to array */
261 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
262 channels[i].enabled = kchan->enabled;
fb83fe64
JD
263 chan_exts[i].discarded_events =
264 discarded_events;
265 chan_exts[i].lost_packets = lost_packets;
2f77fc4b
DG
266 i++;
267 }
268 }
269 break;
270 case LTTNG_DOMAIN_UST:
271 {
272 struct lttng_ht_iter iter;
273 struct ltt_ust_channel *uchan;
274
e7fe706f 275 rcu_read_lock();
2f77fc4b
DG
276 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
277 &iter.iter, uchan, node.node) {
a91c5803 278 uint64_t discarded_events = 0, lost_packets = 0;
fb83fe64 279
2f77fc4b
DG
280 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
281 channels[i].attr.overwrite = uchan->attr.overwrite;
282 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
283 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
284 channels[i].attr.switch_timer_interval =
285 uchan->attr.switch_timer_interval;
286 channels[i].attr.read_timer_interval =
287 uchan->attr.read_timer_interval;
288 channels[i].enabled = uchan->enabled;
2f785fe7
DG
289 channels[i].attr.tracefile_size = uchan->tracefile_size;
290 channels[i].attr.tracefile_count = uchan->tracefile_count;
5e4435a4
JG
291
292 /*
293 * Map enum lttng_ust_output to enum lttng_event_output.
294 */
2f77fc4b
DG
295 switch (uchan->attr.output) {
296 case LTTNG_UST_MMAP:
2f77fc4b
DG
297 channels[i].attr.output = LTTNG_EVENT_MMAP;
298 break;
5e4435a4
JG
299 default:
300 /*
301 * LTTNG_UST_MMAP is the only supported UST
302 * output mode.
303 */
304 assert(0);
305 break;
2f77fc4b 306 }
fb83fe64
JD
307
308 ret = get_ust_runtime_stats(session, uchan,
309 &discarded_events, &lost_packets);
310 if (ret < 0) {
311 break;
312 }
313 chan_exts[i].discarded_events = discarded_events;
314 chan_exts[i].lost_packets = lost_packets;
2f77fc4b
DG
315 i++;
316 }
e7fe706f 317 rcu_read_unlock();
2f77fc4b
DG
318 break;
319 }
320 default:
321 break;
322 }
fb83fe64
JD
323
324end:
325 return;
2f77fc4b
DG
326}
327
b4e3ceb9 328static void increment_extended_len(const char *filter_expression,
795d57ce 329 struct lttng_event_exclusion *exclusion, size_t *extended_len)
b4e3ceb9
PP
330{
331 *extended_len += sizeof(struct lttcomm_event_extended_header);
332
333 if (filter_expression) {
334 *extended_len += strlen(filter_expression) + 1;
335 }
795d57ce
PP
336
337 if (exclusion) {
338 *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN;
339 }
b4e3ceb9
PP
340}
341
342static void append_extended_info(const char *filter_expression,
795d57ce 343 struct lttng_event_exclusion *exclusion, void **extended_at)
b4e3ceb9
PP
344{
345 struct lttcomm_event_extended_header extended_header;
346 size_t filter_len = 0;
795d57ce 347 size_t nb_exclusions = 0;
b4e3ceb9
PP
348
349 if (filter_expression) {
350 filter_len = strlen(filter_expression) + 1;
351 }
352
795d57ce
PP
353 if (exclusion) {
354 nb_exclusions = exclusion->count;
355 }
356
357 /* Set header fields */
b4e3ceb9 358 extended_header.filter_len = filter_len;
795d57ce
PP
359 extended_header.nb_exclusions = nb_exclusions;
360
361 /* Copy header */
b4e3ceb9
PP
362 memcpy(*extended_at, &extended_header, sizeof(extended_header));
363 *extended_at += sizeof(extended_header);
795d57ce
PP
364
365 /* Copy filter string */
366 if (filter_expression) {
367 memcpy(*extended_at, filter_expression, filter_len);
368 *extended_at += filter_len;
369 }
370
371 /* Copy exclusion names */
372 if (exclusion) {
373 size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
374
375 memcpy(*extended_at, &exclusion->names, len);
376 *extended_at += len;
377 }
b4e3ceb9
PP
378}
379
3c6a091f 380/*
022d91ba 381 * Create a list of agent domain events.
3c6a091f
DG
382 *
383 * Return number of events in list on success or else a negative value.
384 */
022d91ba 385static int list_lttng_agent_events(struct agent *agt,
b4e3ceb9 386 struct lttng_event **events, size_t *total_size)
3c6a091f
DG
387{
388 int i = 0, ret = 0;
389 unsigned int nb_event = 0;
022d91ba 390 struct agent_event *event;
3c6a091f
DG
391 struct lttng_event *tmp_events;
392 struct lttng_ht_iter iter;
b4e3ceb9
PP
393 size_t extended_len = 0;
394 void *extended_at;
3c6a091f 395
022d91ba 396 assert(agt);
3c6a091f
DG
397 assert(events);
398
022d91ba 399 DBG3("Listing agent events");
3c6a091f 400
e5bbf678 401 rcu_read_lock();
022d91ba 402 nb_event = lttng_ht_get_count(agt->events);
e5bbf678 403 rcu_read_unlock();
3c6a091f
DG
404 if (nb_event == 0) {
405 ret = nb_event;
b4e3ceb9 406 *total_size = 0;
3c6a091f
DG
407 goto error;
408 }
409
b4e3ceb9
PP
410 /* Compute required extended infos size */
411 extended_len = nb_event * sizeof(struct lttcomm_event_extended_header);
412
413 /*
414 * This is only valid because the commands which add events are
415 * processed in the same thread as the listing.
416 */
417 rcu_read_lock();
418 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
795d57ce
PP
419 increment_extended_len(event->filter_expression, NULL,
420 &extended_len);
b4e3ceb9
PP
421 }
422 rcu_read_unlock();
423
424 *total_size = nb_event * sizeof(*tmp_events) + extended_len;
425 tmp_events = zmalloc(*total_size);
3c6a091f 426 if (!tmp_events) {
022d91ba 427 PERROR("zmalloc agent events session");
3c6a091f
DG
428 ret = -LTTNG_ERR_FATAL;
429 goto error;
430 }
431
b4e3ceb9
PP
432 extended_at = ((uint8_t *) tmp_events) +
433 nb_event * sizeof(struct lttng_event);
434
3c6a091f 435 rcu_read_lock();
022d91ba 436 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
3c6a091f
DG
437 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
438 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
439 tmp_events[i].enabled = event->enabled;
2106efa0 440 tmp_events[i].loglevel = event->loglevel_value;
ff94328f 441 tmp_events[i].loglevel_type = event->loglevel_type;
3c6a091f 442 i++;
b4e3ceb9
PP
443
444 /* Append extended info */
795d57ce
PP
445 append_extended_info(event->filter_expression, NULL,
446 &extended_at);
3c6a091f
DG
447 }
448 rcu_read_unlock();
449
450 *events = tmp_events;
451 ret = nb_event;
452
453error:
454 assert(nb_event == i);
455 return ret;
456}
457
2f77fc4b
DG
458/*
459 * Create a list of ust global domain events.
460 */
461static int list_lttng_ust_global_events(char *channel_name,
b4e3ceb9
PP
462 struct ltt_ust_domain_global *ust_global,
463 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
464{
465 int i = 0, ret = 0;
466 unsigned int nb_event = 0;
467 struct lttng_ht_iter iter;
468 struct lttng_ht_node_str *node;
469 struct ltt_ust_channel *uchan;
470 struct ltt_ust_event *uevent;
471 struct lttng_event *tmp;
b4e3ceb9
PP
472 size_t extended_len = 0;
473 void *extended_at;
2f77fc4b
DG
474
475 DBG("Listing UST global events for channel %s", channel_name);
476
477 rcu_read_lock();
478
479 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
480 node = lttng_ht_iter_get_node_str(&iter);
481 if (node == NULL) {
f73fabfd 482 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
d31d3e8c 483 goto end;
2f77fc4b
DG
484 }
485
486 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
487
3c442be3 488 nb_event = lttng_ht_get_count(uchan->events);
2f77fc4b
DG
489 if (nb_event == 0) {
490 ret = nb_event;
b4e3ceb9 491 *total_size = 0;
d31d3e8c 492 goto end;
2f77fc4b
DG
493 }
494
495 DBG3("Listing UST global %d events", nb_event);
496
b4e3ceb9
PP
497 /* Compute required extended infos size */
498 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
499 if (uevent->internal) {
500 nb_event--;
501 continue;
502 }
503
504 increment_extended_len(uevent->filter_expression,
795d57ce 505 uevent->exclusion, &extended_len);
b4e3ceb9 506 }
d31d3e8c
PP
507 if (nb_event == 0) {
508 /* All events are internal, skip. */
509 ret = 0;
510 *total_size = 0;
511 goto end;
512 }
b4e3ceb9
PP
513
514 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
515 tmp = zmalloc(*total_size);
2f77fc4b 516 if (tmp == NULL) {
b12c38df
JG
517 ret = -LTTNG_ERR_FATAL;
518 goto end;
2f77fc4b
DG
519 }
520
b4e3ceb9
PP
521 extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event);
522
2f77fc4b 523 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
3c442be3
JG
524 if (uevent->internal) {
525 /* This event should remain hidden from clients */
3c442be3
JG
526 continue;
527 }
2f77fc4b
DG
528 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
529 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
530 tmp[i].enabled = uevent->enabled;
531
532 switch (uevent->attr.instrumentation) {
533 case LTTNG_UST_TRACEPOINT:
534 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
535 break;
536 case LTTNG_UST_PROBE:
537 tmp[i].type = LTTNG_EVENT_PROBE;
538 break;
539 case LTTNG_UST_FUNCTION:
540 tmp[i].type = LTTNG_EVENT_FUNCTION;
541 break;
542 }
543
544 tmp[i].loglevel = uevent->attr.loglevel;
545 switch (uevent->attr.loglevel_type) {
546 case LTTNG_UST_LOGLEVEL_ALL:
547 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
548 break;
549 case LTTNG_UST_LOGLEVEL_RANGE:
550 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
551 break;
552 case LTTNG_UST_LOGLEVEL_SINGLE:
553 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
554 break;
555 }
556 if (uevent->filter) {
557 tmp[i].filter = 1;
558 }
4634f12e
JI
559 if (uevent->exclusion) {
560 tmp[i].exclusion = 1;
561 }
2f77fc4b 562 i++;
b4e3ceb9
PP
563
564 /* Append extended info */
795d57ce
PP
565 append_extended_info(uevent->filter_expression,
566 uevent->exclusion, &extended_at);
2f77fc4b
DG
567 }
568
569 ret = nb_event;
570 *events = tmp;
d31d3e8c 571end:
2f77fc4b
DG
572 rcu_read_unlock();
573 return ret;
574}
575
576/*
577 * Fill lttng_event array of all kernel events in the channel.
578 */
579static int list_lttng_kernel_events(char *channel_name,
b4e3ceb9
PP
580 struct ltt_kernel_session *kernel_session,
581 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
582{
583 int i = 0, ret;
584 unsigned int nb_event;
585 struct ltt_kernel_event *event;
586 struct ltt_kernel_channel *kchan;
b4e3ceb9
PP
587 size_t extended_len = 0;
588 void *extended_at;
2f77fc4b
DG
589
590 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
591 if (kchan == NULL) {
f73fabfd 592 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG
593 goto error;
594 }
595
596 nb_event = kchan->event_count;
597
598 DBG("Listing events for channel %s", kchan->channel->name);
599
600 if (nb_event == 0) {
b4e3ceb9 601 *total_size = 0;
834978fd 602 *events = NULL;
db906c12 603 goto end;
2f77fc4b
DG
604 }
605
b4e3ceb9
PP
606 /* Compute required extended infos size */
607 cds_list_for_each_entry(event, &kchan->events_list.head, list) {
795d57ce
PP
608 increment_extended_len(event->filter_expression, NULL,
609 &extended_len);
b4e3ceb9
PP
610 }
611
612 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
613 *events = zmalloc(*total_size);
2f77fc4b 614 if (*events == NULL) {
f73fabfd 615 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
616 goto error;
617 }
618
ab4aa612 619 extended_at = ((void *) *events) +
b4e3ceb9
PP
620 nb_event * sizeof(struct lttng_event);
621
2f77fc4b
DG
622 /* Kernel channels */
623 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
624 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
625 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
626 (*events)[i].enabled = event->enabled;
00f992f2
JG
627 (*events)[i].filter =
628 (unsigned char) !!event->filter_expression;
2f77fc4b
DG
629
630 switch (event->event->instrumentation) {
631 case LTTNG_KERNEL_TRACEPOINT:
632 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
633 break;
2f77fc4b 634 case LTTNG_KERNEL_KRETPROBE:
1896972b
DG
635 (*events)[i].type = LTTNG_EVENT_FUNCTION;
636 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
637 sizeof(struct lttng_kernel_kprobe));
638 break;
639 case LTTNG_KERNEL_KPROBE:
2f77fc4b
DG
640 (*events)[i].type = LTTNG_EVENT_PROBE;
641 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
642 sizeof(struct lttng_kernel_kprobe));
643 break;
644 case LTTNG_KERNEL_FUNCTION:
645 (*events)[i].type = LTTNG_EVENT_FUNCTION;
646 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
647 sizeof(struct lttng_kernel_function));
648 break;
649 case LTTNG_KERNEL_NOOP:
650 (*events)[i].type = LTTNG_EVENT_NOOP;
651 break;
652 case LTTNG_KERNEL_SYSCALL:
653 (*events)[i].type = LTTNG_EVENT_SYSCALL;
654 break;
655 case LTTNG_KERNEL_ALL:
656 assert(0);
657 break;
658 }
659 i++;
b4e3ceb9
PP
660
661 /* Append extended info */
795d57ce
PP
662 append_extended_info(event->filter_expression, NULL,
663 &extended_at);
2f77fc4b
DG
664 }
665
db906c12 666end:
2f77fc4b
DG
667 return nb_event;
668
669error:
f73fabfd
DG
670 /* Negate the error code to differentiate the size from an error */
671 return -ret;
2f77fc4b
DG
672}
673
674/*
675 * Add URI so the consumer output object. Set the correct path depending on the
676 * domain adding the default trace directory.
677 */
678static int add_uri_to_consumer(struct consumer_output *consumer,
56a37563
JG
679 struct lttng_uri *uri, enum lttng_domain_type domain,
680 const char *session_name)
2f77fc4b 681{
f73fabfd 682 int ret = LTTNG_OK;
2f77fc4b
DG
683 const char *default_trace_dir;
684
685 assert(uri);
686
687 if (consumer == NULL) {
688 DBG("No consumer detected. Don't add URI. Stopping.");
f73fabfd 689 ret = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
690 goto error;
691 }
692
693 switch (domain) {
694 case LTTNG_DOMAIN_KERNEL:
695 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
696 break;
697 case LTTNG_DOMAIN_UST:
698 default_trace_dir = DEFAULT_UST_TRACE_DIR;
699 break;
700 default:
701 /*
702 * This case is possible is we try to add the URI to the global tracing
703 * session consumer object which in this case there is no subdir.
704 */
705 default_trace_dir = "";
706 }
707
708 switch (uri->dtype) {
709 case LTTNG_DST_IPV4:
710 case LTTNG_DST_IPV6:
711 DBG2("Setting network URI to consumer");
712
df75acac
DG
713 if (consumer->type == CONSUMER_DST_NET) {
714 if ((uri->stype == LTTNG_STREAM_CONTROL &&
785d2d0d
DG
715 consumer->dst.net.control_isset) ||
716 (uri->stype == LTTNG_STREAM_DATA &&
717 consumer->dst.net.data_isset)) {
df75acac
DG
718 ret = LTTNG_ERR_URL_EXIST;
719 goto error;
720 }
721 } else {
722 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
785d2d0d
DG
723 }
724
df75acac
DG
725 consumer->type = CONSUMER_DST_NET;
726
2f77fc4b
DG
727 /* Set URI into consumer output object */
728 ret = consumer_set_network_uri(consumer, uri);
729 if (ret < 0) {
a74934ba 730 ret = -ret;
2f77fc4b
DG
731 goto error;
732 } else if (ret == 1) {
733 /*
734 * URI was the same in the consumer so we do not append the subdir
735 * again so to not duplicate output dir.
736 */
f86c9f4e 737 ret = LTTNG_OK;
2f77fc4b
DG
738 goto error;
739 }
740
741 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
742 ret = consumer_set_subdir(consumer, session_name);
743 if (ret < 0) {
f73fabfd 744 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
745 goto error;
746 }
747 }
748
749 if (uri->stype == LTTNG_STREAM_CONTROL) {
750 /* On a new subdir, reappend the default trace dir. */
c30ce0b3
CB
751 strncat(consumer->subdir, default_trace_dir,
752 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2f77fc4b
DG
753 DBG3("Append domain trace name to subdir %s", consumer->subdir);
754 }
755
756 break;
757 case LTTNG_DST_PATH:
758 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
759 memset(consumer->dst.trace_path, 0,
760 sizeof(consumer->dst.trace_path));
9ac05d92
MD
761 /* Explicit length checks for strcpy and strcat. */
762 if (strlen(uri->dst.path) + strlen(default_trace_dir)
763 >= sizeof(consumer->dst.trace_path)) {
764 ret = LTTNG_ERR_FATAL;
765 goto error;
766 }
767 strcpy(consumer->dst.trace_path, uri->dst.path);
2f77fc4b 768 /* Append default trace dir */
9ac05d92 769 strcat(consumer->dst.trace_path, default_trace_dir);
2f77fc4b
DG
770 /* Flag consumer as local. */
771 consumer->type = CONSUMER_DST_LOCAL;
772 break;
773 }
774
a74934ba
DG
775 ret = LTTNG_OK;
776
2f77fc4b
DG
777error:
778 return ret;
779}
780
781/*
782 * Init tracing by creating trace directory and sending fds kernel consumer.
783 */
784static int init_kernel_tracing(struct ltt_kernel_session *session)
785{
786 int ret = 0;
787 struct lttng_ht_iter iter;
788 struct consumer_socket *socket;
789
790 assert(session);
791
e7fe706f
DG
792 rcu_read_lock();
793
2f77fc4b
DG
794 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
795 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
796 socket, node.node) {
2f77fc4b 797 pthread_mutex_lock(socket->lock);
f50f23d9 798 ret = kernel_consumer_send_session(socket, session);
2f77fc4b
DG
799 pthread_mutex_unlock(socket->lock);
800 if (ret < 0) {
f73fabfd 801 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
802 goto error;
803 }
804 }
805 }
806
807error:
e7fe706f 808 rcu_read_unlock();
2f77fc4b
DG
809 return ret;
810}
811
812/*
813 * Create a socket to the relayd using the URI.
814 *
815 * On success, the relayd_sock pointer is set to the created socket.
816 * Else, it's stays untouched and a lttcomm error code is returned.
817 */
6151a90f 818static int create_connect_relayd(struct lttng_uri *uri,
b31610f2
JD
819 struct lttcomm_relayd_sock **relayd_sock,
820 struct consumer_output *consumer)
2f77fc4b
DG
821{
822 int ret;
6151a90f 823 struct lttcomm_relayd_sock *rsock;
2f77fc4b 824
6151a90f
JD
825 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
826 RELAYD_VERSION_COMM_MINOR);
827 if (!rsock) {
f73fabfd 828 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
829 goto error;
830 }
831
ffe60014
DG
832 /*
833 * Connect to relayd so we can proceed with a session creation. This call
834 * can possibly block for an arbitrary amount of time to set the health
835 * state to be in poll execution.
836 */
837 health_poll_entry();
6151a90f 838 ret = relayd_connect(rsock);
ffe60014 839 health_poll_exit();
2f77fc4b
DG
840 if (ret < 0) {
841 ERR("Unable to reach lttng-relayd");
f73fabfd 842 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG
843 goto free_sock;
844 }
845
846 /* Create socket for control stream. */
847 if (uri->stype == LTTNG_STREAM_CONTROL) {
848 DBG3("Creating relayd stream socket from URI");
849
850 /* Check relayd version */
6151a90f 851 ret = relayd_version_check(rsock);
2f77fc4b 852 if (ret < 0) {
f73fabfd 853 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
2f77fc4b
DG
854 goto close_sock;
855 }
b31610f2
JD
856 consumer->relay_major_version = rsock->major;
857 consumer->relay_minor_version = rsock->minor;
2f77fc4b
DG
858 } else if (uri->stype == LTTNG_STREAM_DATA) {
859 DBG3("Creating relayd data socket from URI");
860 } else {
861 /* Command is not valid */
862 ERR("Relayd invalid stream type: %d", uri->stype);
f73fabfd 863 ret = LTTNG_ERR_INVALID;
2f77fc4b
DG
864 goto close_sock;
865 }
866
6151a90f 867 *relayd_sock = rsock;
2f77fc4b 868
f73fabfd 869 return LTTNG_OK;
2f77fc4b
DG
870
871close_sock:
6151a90f
JD
872 /* The returned value is not useful since we are on an error path. */
873 (void) relayd_close(rsock);
2f77fc4b 874free_sock:
6151a90f 875 free(rsock);
2f77fc4b
DG
876error:
877 return ret;
878}
879
880/*
881 * Connect to the relayd using URI and send the socket to the right consumer.
882 */
56a37563
JG
883static int send_consumer_relayd_socket(enum lttng_domain_type domain,
884 unsigned int session_id, struct lttng_uri *relayd_uri,
885 struct consumer_output *consumer,
d3e2ba59
JD
886 struct consumer_socket *consumer_sock,
887 char *session_name, char *hostname, int session_live_timer)
2f77fc4b
DG
888{
889 int ret;
6151a90f 890 struct lttcomm_relayd_sock *rsock = NULL;
2f77fc4b 891
ffe60014 892 /* Connect to relayd and make version check if uri is the control. */
b31610f2 893 ret = create_connect_relayd(relayd_uri, &rsock, consumer);
ffe60014 894 if (ret != LTTNG_OK) {
6151a90f 895 goto error;
ffe60014 896 }
6151a90f 897 assert(rsock);
ffe60014 898
2f77fc4b 899 /* Set the network sequence index if not set. */
d88aee68
DG
900 if (consumer->net_seq_index == (uint64_t) -1ULL) {
901 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
902 /*
903 * Increment net_seq_idx because we are about to transfer the
904 * new relayd socket to the consumer.
d88aee68 905 * Assign unique key so the consumer can match streams.
2f77fc4b 906 */
d88aee68
DG
907 consumer->net_seq_index = ++relayd_net_seq_idx;
908 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
909 }
910
2f77fc4b 911 /* Send relayd socket to consumer. */
6151a90f 912 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
d3e2ba59
JD
913 relayd_uri->stype, session_id,
914 session_name, hostname, session_live_timer);
2f77fc4b 915 if (ret < 0) {
f73fabfd 916 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
917 goto close_sock;
918 }
919
c890b720
DG
920 /* Flag that the corresponding socket was sent. */
921 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
ffe60014 922 consumer_sock->control_sock_sent = 1;
c890b720 923 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
ffe60014 924 consumer_sock->data_sock_sent = 1;
c890b720
DG
925 }
926
f73fabfd 927 ret = LTTNG_OK;
2f77fc4b
DG
928
929 /*
930 * Close socket which was dup on the consumer side. The session daemon does
931 * NOT keep track of the relayd socket(s) once transfer to the consumer.
932 */
933
934close_sock:
6151a90f
JD
935 (void) relayd_close(rsock);
936 free(rsock);
2f77fc4b 937
6151a90f 938error:
ffe60014
DG
939 if (ret != LTTNG_OK) {
940 /*
d9078d0c
DG
941 * The consumer output for this session should not be used anymore
942 * since the relayd connection failed thus making any tracing or/and
943 * streaming not usable.
ffe60014 944 */
d9078d0c 945 consumer->enabled = 0;
ffe60014 946 }
2f77fc4b
DG
947 return ret;
948}
949
950/*
951 * Send both relayd sockets to a specific consumer and domain. This is a
952 * helper function to facilitate sending the information to the consumer for a
953 * session.
954 */
56a37563
JG
955static int send_consumer_relayd_sockets(enum lttng_domain_type domain,
956 unsigned int session_id, struct consumer_output *consumer,
957 struct consumer_socket *sock, char *session_name,
958 char *hostname, int session_live_timer)
2f77fc4b 959{
dda67f6c 960 int ret = LTTNG_OK;
2f77fc4b 961
2f77fc4b 962 assert(consumer);
6dc3064a 963 assert(sock);
2f77fc4b 964
2f77fc4b 965 /* Sending control relayd socket. */
ffe60014 966 if (!sock->control_sock_sent) {
6dc3064a 967 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD
968 &consumer->dst.net.control, consumer, sock,
969 session_name, hostname, session_live_timer);
c890b720
DG
970 if (ret != LTTNG_OK) {
971 goto error;
972 }
2f77fc4b
DG
973 }
974
975 /* Sending data relayd socket. */
ffe60014 976 if (!sock->data_sock_sent) {
6dc3064a 977 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD
978 &consumer->dst.net.data, consumer, sock,
979 session_name, hostname, session_live_timer);
c890b720
DG
980 if (ret != LTTNG_OK) {
981 goto error;
982 }
2f77fc4b
DG
983 }
984
2f77fc4b
DG
985error:
986 return ret;
987}
988
989/*
990 * Setup relayd connections for a tracing session. First creates the socket to
991 * the relayd and send them to the right domain consumer. Consumer type MUST be
992 * network.
993 */
ffe60014 994int cmd_setup_relayd(struct ltt_session *session)
2f77fc4b 995{
f73fabfd 996 int ret = LTTNG_OK;
2f77fc4b
DG
997 struct ltt_ust_session *usess;
998 struct ltt_kernel_session *ksess;
999 struct consumer_socket *socket;
1000 struct lttng_ht_iter iter;
1001
1002 assert(session);
1003
1004 usess = session->ust_session;
1005 ksess = session->kernel_session;
1006
785d2d0d 1007 DBG("Setting relayd for session %s", session->name);
2f77fc4b 1008
e7fe706f
DG
1009 rcu_read_lock();
1010
2f77fc4b
DG
1011 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
1012 && usess->consumer->enabled) {
1013 /* For each consumer socket, send relayd sockets */
1014 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
1015 socket, node.node) {
2f77fc4b 1016 pthread_mutex_lock(socket->lock);
6dc3064a 1017 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
d3e2ba59
JD
1018 usess->consumer, socket,
1019 session->name, session->hostname,
1020 session->live_timer);
2f77fc4b 1021 pthread_mutex_unlock(socket->lock);
f73fabfd 1022 if (ret != LTTNG_OK) {
2f77fc4b
DG
1023 goto error;
1024 }
6dc3064a
DG
1025 /* Session is now ready for network streaming. */
1026 session->net_handle = 1;
2f77fc4b 1027 }
b31610f2
JD
1028 session->consumer->relay_major_version =
1029 usess->consumer->relay_major_version;
1030 session->consumer->relay_minor_version =
1031 usess->consumer->relay_minor_version;
2f77fc4b
DG
1032 }
1033
1034 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
1035 && ksess->consumer->enabled) {
1036 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
1037 socket, node.node) {
2f77fc4b 1038 pthread_mutex_lock(socket->lock);
6dc3064a 1039 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
d3e2ba59
JD
1040 ksess->consumer, socket,
1041 session->name, session->hostname,
1042 session->live_timer);
2f77fc4b 1043 pthread_mutex_unlock(socket->lock);
f73fabfd 1044 if (ret != LTTNG_OK) {
2f77fc4b
DG
1045 goto error;
1046 }
6dc3064a
DG
1047 /* Session is now ready for network streaming. */
1048 session->net_handle = 1;
2f77fc4b 1049 }
b31610f2
JD
1050 session->consumer->relay_major_version =
1051 ksess->consumer->relay_major_version;
1052 session->consumer->relay_minor_version =
1053 ksess->consumer->relay_minor_version;
2f77fc4b
DG
1054 }
1055
1056error:
e7fe706f 1057 rcu_read_unlock();
2f77fc4b
DG
1058 return ret;
1059}
1060
9b6c7ec5
DG
1061/*
1062 * Start a kernel session by opening all necessary streams.
1063 */
1064static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
1065{
1066 int ret;
1067 struct ltt_kernel_channel *kchan;
1068
1069 /* Open kernel metadata */
07b86b52 1070 if (ksess->metadata == NULL && ksess->output_traces) {
9b6c7ec5
DG
1071 ret = kernel_open_metadata(ksess);
1072 if (ret < 0) {
1073 ret = LTTNG_ERR_KERN_META_FAIL;
1074 goto error;
1075 }
1076 }
1077
1078 /* Open kernel metadata stream */
07b86b52 1079 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
9b6c7ec5
DG
1080 ret = kernel_open_metadata_stream(ksess);
1081 if (ret < 0) {
1082 ERR("Kernel create metadata stream failed");
1083 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1084 goto error;
1085 }
1086 }
1087
1088 /* For each channel */
1089 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
1090 if (kchan->stream_count == 0) {
1091 ret = kernel_open_channel_stream(kchan);
1092 if (ret < 0) {
1093 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1094 goto error;
1095 }
1096 /* Update the stream global counter */
1097 ksess->stream_count_global += ret;
1098 }
1099 }
1100
1101 /* Setup kernel consumer socket and send fds to it */
1102 ret = init_kernel_tracing(ksess);
e43c41c5 1103 if (ret != 0) {
9b6c7ec5
DG
1104 ret = LTTNG_ERR_KERN_START_FAIL;
1105 goto error;
1106 }
1107
1108 /* This start the kernel tracing */
1109 ret = kernel_start_session(ksess);
1110 if (ret < 0) {
1111 ret = LTTNG_ERR_KERN_START_FAIL;
1112 goto error;
1113 }
1114
1115 /* Quiescent wait after starting trace */
784303b0 1116 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5 1117
14fb1ebe 1118 ksess->active = 1;
9b6c7ec5
DG
1119
1120 ret = LTTNG_OK;
1121
1122error:
1123 return ret;
1124}
1125
2f77fc4b
DG
1126/*
1127 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1128 */
56a37563
JG
1129int cmd_disable_channel(struct ltt_session *session,
1130 enum lttng_domain_type domain, char *channel_name)
2f77fc4b
DG
1131{
1132 int ret;
1133 struct ltt_ust_session *usess;
1134
1135 usess = session->ust_session;
1136
2223c96f
DG
1137 rcu_read_lock();
1138
2f77fc4b
DG
1139 switch (domain) {
1140 case LTTNG_DOMAIN_KERNEL:
1141 {
1142 ret = channel_kernel_disable(session->kernel_session,
1143 channel_name);
f73fabfd 1144 if (ret != LTTNG_OK) {
2f77fc4b
DG
1145 goto error;
1146 }
1147
1148 kernel_wait_quiescent(kernel_tracer_fd);
1149 break;
1150 }
1151 case LTTNG_DOMAIN_UST:
1152 {
1153 struct ltt_ust_channel *uchan;
1154 struct lttng_ht *chan_ht;
1155
1156 chan_ht = usess->domain_global.channels;
1157
1158 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
1159 if (uchan == NULL) {
f73fabfd 1160 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
1161 goto error;
1162 }
1163
7972aab2 1164 ret = channel_ust_disable(usess, uchan);
f73fabfd 1165 if (ret != LTTNG_OK) {
2f77fc4b
DG
1166 goto error;
1167 }
1168 break;
1169 }
2f77fc4b 1170 default:
f73fabfd 1171 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1172 goto error;
1173 }
1174
f73fabfd 1175 ret = LTTNG_OK;
2f77fc4b
DG
1176
1177error:
2223c96f 1178 rcu_read_unlock();
2f77fc4b
DG
1179 return ret;
1180}
1181
ccf10263
MD
1182/*
1183 * Command LTTNG_TRACK_PID processed by the client thread.
a9ad0c8f
MD
1184 *
1185 * Called with session lock held.
ccf10263 1186 */
56a37563
JG
1187int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain,
1188 int pid)
ccf10263
MD
1189{
1190 int ret;
1191
1192 rcu_read_lock();
1193
1194 switch (domain) {
1195 case LTTNG_DOMAIN_KERNEL:
1196 {
1197 struct ltt_kernel_session *ksess;
1198
1199 ksess = session->kernel_session;
1200
1201 ret = kernel_track_pid(ksess, pid);
1202 if (ret != LTTNG_OK) {
1203 goto error;
1204 }
1205
1206 kernel_wait_quiescent(kernel_tracer_fd);
1207 break;
1208 }
ccf10263 1209 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
1210 {
1211 struct ltt_ust_session *usess;
1212
1213 usess = session->ust_session;
1214
1215 ret = trace_ust_track_pid(usess, pid);
1216 if (ret != LTTNG_OK) {
1217 goto error;
1218 }
1219 break;
1220 }
ccf10263
MD
1221 default:
1222 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1223 goto error;
1224 }
1225
1226 ret = LTTNG_OK;
1227
1228error:
1229 rcu_read_unlock();
1230 return ret;
1231}
1232
1233/*
1234 * Command LTTNG_UNTRACK_PID processed by the client thread.
a9ad0c8f
MD
1235 *
1236 * Called with session lock held.
ccf10263 1237 */
56a37563
JG
1238int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain,
1239 int pid)
ccf10263
MD
1240{
1241 int ret;
1242
1243 rcu_read_lock();
1244
1245 switch (domain) {
1246 case LTTNG_DOMAIN_KERNEL:
1247 {
1248 struct ltt_kernel_session *ksess;
1249
1250 ksess = session->kernel_session;
1251
1252 ret = kernel_untrack_pid(ksess, pid);
1253 if (ret != LTTNG_OK) {
1254 goto error;
1255 }
1256
1257 kernel_wait_quiescent(kernel_tracer_fd);
1258 break;
1259 }
ccf10263 1260 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
1261 {
1262 struct ltt_ust_session *usess;
1263
1264 usess = session->ust_session;
1265
1266 ret = trace_ust_untrack_pid(usess, pid);
1267 if (ret != LTTNG_OK) {
1268 goto error;
1269 }
1270 break;
1271 }
ccf10263
MD
1272 default:
1273 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1274 goto error;
1275 }
1276
1277 ret = LTTNG_OK;
1278
1279error:
1280 rcu_read_unlock();
1281 return ret;
1282}
1283
2f77fc4b
DG
1284/*
1285 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1286 *
1287 * The wpipe arguments is used as a notifier for the kernel thread.
1288 */
1289int cmd_enable_channel(struct ltt_session *session,
7972aab2 1290 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
2f77fc4b
DG
1291{
1292 int ret;
1293 struct ltt_ust_session *usess = session->ust_session;
1294 struct lttng_ht *chan_ht;
1f345e94 1295 size_t len;
2f77fc4b
DG
1296
1297 assert(session);
1298 assert(attr);
7972aab2 1299 assert(domain);
2f77fc4b 1300
f5436bfc 1301 len = lttng_strnlen(attr->name, sizeof(attr->name));
1f345e94
PP
1302
1303 /* Validate channel name */
1304 if (attr->name[0] == '.' ||
1305 memchr(attr->name, '/', len) != NULL) {
1306 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1307 goto end;
1308 }
1309
2f77fc4b
DG
1310 DBG("Enabling channel %s for session %s", attr->name, session->name);
1311
03b4fdcf
DG
1312 rcu_read_lock();
1313
ecc48a90
JD
1314 /*
1315 * Don't try to enable a channel if the session has been started at
1316 * some point in time before. The tracer does not allow it.
1317 */
8382cf6f 1318 if (session->has_been_started) {
ecc48a90
JD
1319 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1320 goto error;
1321 }
1322
1323 /*
1324 * If the session is a live session, remove the switch timer, the
1325 * live timer does the same thing but sends also synchronisation
1326 * beacons for inactive streams.
1327 */
1328 if (session->live_timer > 0) {
1329 attr->attr.live_timer_interval = session->live_timer;
1330 attr->attr.switch_timer_interval = 0;
1331 }
1332
33fbd469
DG
1333 /*
1334 * The ringbuffer (both in user space and kernel) behave badly in overwrite
1335 * mode and with less than 2 subbuf so block it right away and send back an
1336 * invalid attribute error.
1337 */
1338 if (attr->attr.overwrite && attr->attr.num_subbuf < 2) {
1339 ret = LTTNG_ERR_INVALID;
1340 goto error;
1341 }
1342
7972aab2 1343 switch (domain->type) {
2f77fc4b
DG
1344 case LTTNG_DOMAIN_KERNEL:
1345 {
1346 struct ltt_kernel_channel *kchan;
1347
2f77fc4b
DG
1348 kchan = trace_kernel_get_channel_by_name(attr->name,
1349 session->kernel_session);
1350 if (kchan == NULL) {
1351 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
85076754
MD
1352 if (attr->name[0] != '\0') {
1353 session->kernel_session->has_non_default_channel = 1;
1354 }
2f77fc4b
DG
1355 } else {
1356 ret = channel_kernel_enable(session->kernel_session, kchan);
1357 }
1358
f73fabfd 1359 if (ret != LTTNG_OK) {
2f77fc4b
DG
1360 goto error;
1361 }
1362
784303b0 1363 kernel_wait_quiescent(kernel_tracer_fd);
2f77fc4b
DG
1364 break;
1365 }
1366 case LTTNG_DOMAIN_UST:
9232818f
JG
1367 case LTTNG_DOMAIN_JUL:
1368 case LTTNG_DOMAIN_LOG4J:
1369 case LTTNG_DOMAIN_PYTHON:
2f77fc4b
DG
1370 {
1371 struct ltt_ust_channel *uchan;
1372
9232818f
JG
1373 /*
1374 * FIXME
1375 *
1376 * Current agent implementation limitations force us to allow
1377 * only one channel at once in "agent" subdomains. Each
1378 * subdomain has a default channel name which must be strictly
1379 * adhered to.
1380 */
1381 if (domain->type == LTTNG_DOMAIN_JUL) {
1382 if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME,
1383 LTTNG_SYMBOL_NAME_LEN)) {
1384 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1385 goto error;
1386 }
1387 } else if (domain->type == LTTNG_DOMAIN_LOG4J) {
1388 if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME,
1389 LTTNG_SYMBOL_NAME_LEN)) {
1390 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1391 goto error;
1392 }
1393 } else if (domain->type == LTTNG_DOMAIN_PYTHON) {
1394 if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME,
1395 LTTNG_SYMBOL_NAME_LEN)) {
1396 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1397 goto error;
1398 }
1399 }
1400
2f77fc4b
DG
1401 chan_ht = usess->domain_global.channels;
1402
1403 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1404 if (uchan == NULL) {
7972aab2 1405 ret = channel_ust_create(usess, attr, domain->buf_type);
85076754
MD
1406 if (attr->name[0] != '\0') {
1407 usess->has_non_default_channel = 1;
1408 }
2f77fc4b 1409 } else {
7972aab2 1410 ret = channel_ust_enable(usess, uchan);
2f77fc4b
DG
1411 }
1412 break;
1413 }
2f77fc4b 1414 default:
f73fabfd 1415 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1416 goto error;
1417 }
1418
1419error:
2223c96f 1420 rcu_read_unlock();
1f345e94 1421end:
2f77fc4b
DG
1422 return ret;
1423}
1424
2f77fc4b
DG
1425/*
1426 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1427 */
56a37563
JG
1428int cmd_disable_event(struct ltt_session *session,
1429 enum lttng_domain_type domain, char *channel_name,
6e911cad 1430 struct lttng_event *event)
2f77fc4b
DG
1431{
1432 int ret;
6e911cad
MD
1433 char *event_name;
1434
18a720cd
MD
1435 DBG("Disable event command for event \'%s\'", event->name);
1436
6e911cad 1437 event_name = event->name;
7076b56e
JG
1438 if (validate_event_name(event_name)) {
1439 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1440 goto error;
1441 }
6e911cad 1442
9b7431cf
JG
1443 /* Error out on unhandled search criteria */
1444 if (event->loglevel_type || event->loglevel != -1 || event->enabled
6e911cad 1445 || event->pid || event->filter || event->exclusion) {
7076b56e
JG
1446 ret = LTTNG_ERR_UNK;
1447 goto error;
6e911cad 1448 }
2f77fc4b 1449
2223c96f
DG
1450 rcu_read_lock();
1451
2f77fc4b
DG
1452 switch (domain) {
1453 case LTTNG_DOMAIN_KERNEL:
1454 {
1455 struct ltt_kernel_channel *kchan;
1456 struct ltt_kernel_session *ksess;
1457
1458 ksess = session->kernel_session;
1459
85076754
MD
1460 /*
1461 * If a non-default channel has been created in the
1462 * session, explicitely require that -c chan_name needs
1463 * to be provided.
1464 */
1465 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1466 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1467 goto error_unlock;
85076754
MD
1468 }
1469
2f77fc4b
DG
1470 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1471 if (kchan == NULL) {
f73fabfd 1472 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
7076b56e 1473 goto error_unlock;
2f77fc4b
DG
1474 }
1475
6e911cad
MD
1476 switch (event->type) {
1477 case LTTNG_EVENT_ALL:
9550ee81 1478 case LTTNG_EVENT_TRACEPOINT:
d0ae4ea8 1479 case LTTNG_EVENT_SYSCALL:
9550ee81
JR
1480 case LTTNG_EVENT_PROBE:
1481 case LTTNG_EVENT_FUNCTION:
1482 case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */
1483 if (event_name[0] == '\0') {
1484 ret = event_kernel_disable_event(kchan,
1485 NULL, event->type);
29c62722 1486 } else {
d0ae4ea8 1487 ret = event_kernel_disable_event(kchan,
9550ee81 1488 event_name, event->type);
29c62722 1489 }
6e911cad 1490 if (ret != LTTNG_OK) {
7076b56e 1491 goto error_unlock;
6e911cad
MD
1492 }
1493 break;
6e911cad
MD
1494 default:
1495 ret = LTTNG_ERR_UNK;
7076b56e 1496 goto error_unlock;
2f77fc4b
DG
1497 }
1498
1499 kernel_wait_quiescent(kernel_tracer_fd);
1500 break;
1501 }
1502 case LTTNG_DOMAIN_UST:
1503 {
1504 struct ltt_ust_channel *uchan;
1505 struct ltt_ust_session *usess;
1506
1507 usess = session->ust_session;
1508
7076b56e
JG
1509 if (validate_ust_event_name(event_name)) {
1510 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1511 goto error_unlock;
1512 }
1513
85076754
MD
1514 /*
1515 * If a non-default channel has been created in the
9550ee81 1516 * session, explicitly require that -c chan_name needs
85076754
MD
1517 * to be provided.
1518 */
1519 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1520 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1521 goto error_unlock;
85076754
MD
1522 }
1523
2f77fc4b
DG
1524 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1525 channel_name);
1526 if (uchan == NULL) {
f73fabfd 1527 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
7076b56e 1528 goto error_unlock;
2f77fc4b
DG
1529 }
1530
6e911cad
MD
1531 switch (event->type) {
1532 case LTTNG_EVENT_ALL:
b3639870
JR
1533 /*
1534 * An empty event name means that everything
1535 * should be disabled.
1536 */
1537 if (event->name[0] == '\0') {
1538 ret = event_ust_disable_all_tracepoints(usess, uchan);
77d536b2
JR
1539 } else {
1540 ret = event_ust_disable_tracepoint(usess, uchan,
1541 event_name);
1542 }
6e911cad 1543 if (ret != LTTNG_OK) {
7076b56e 1544 goto error_unlock;
6e911cad
MD
1545 }
1546 break;
1547 default:
1548 ret = LTTNG_ERR_UNK;
7076b56e 1549 goto error_unlock;
2f77fc4b
DG
1550 }
1551
1552 DBG3("Disable UST event %s in channel %s completed", event_name,
1553 channel_name);
1554 break;
1555 }
5cdb6027 1556 case LTTNG_DOMAIN_LOG4J:
f20baf8e 1557 case LTTNG_DOMAIN_JUL:
0e115563 1558 case LTTNG_DOMAIN_PYTHON:
f20baf8e 1559 {
fefd409b 1560 struct agent *agt;
f20baf8e
DG
1561 struct ltt_ust_session *usess = session->ust_session;
1562
1563 assert(usess);
1564
6e911cad
MD
1565 switch (event->type) {
1566 case LTTNG_EVENT_ALL:
1567 break;
1568 default:
1569 ret = LTTNG_ERR_UNK;
7076b56e 1570 goto error_unlock;
6e911cad
MD
1571 }
1572
5cdb6027 1573 agt = trace_ust_find_agent(usess, domain);
fefd409b
DG
1574 if (!agt) {
1575 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
7076b56e 1576 goto error_unlock;
fefd409b 1577 }
b3639870
JR
1578 /*
1579 * An empty event name means that everything
1580 * should be disabled.
1581 */
1582 if (event->name[0] == '\0') {
18a720cd
MD
1583 ret = event_agent_disable_all(usess, agt);
1584 } else {
1585 ret = event_agent_disable(usess, agt, event_name);
1586 }
f20baf8e 1587 if (ret != LTTNG_OK) {
7076b56e 1588 goto error_unlock;
f20baf8e
DG
1589 }
1590
1591 break;
1592 }
2f77fc4b 1593 default:
f73fabfd 1594 ret = LTTNG_ERR_UND;
7076b56e 1595 goto error_unlock;
2f77fc4b
DG
1596 }
1597
f73fabfd 1598 ret = LTTNG_OK;
2f77fc4b 1599
7076b56e 1600error_unlock:
2223c96f 1601 rcu_read_unlock();
7076b56e 1602error:
2f77fc4b
DG
1603 return ret;
1604}
1605
2f77fc4b
DG
1606/*
1607 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1608 */
56a37563 1609int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain,
601d5acf 1610 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
2f77fc4b 1611{
d5979e4a 1612 int ret, chan_kern_created = 0, chan_ust_created = 0;
bdf64013
JG
1613 char *app_ctx_provider_name = NULL, *app_ctx_name = NULL;
1614
1615 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
1616 app_ctx_provider_name = ctx->u.app_ctx.provider_name;
1617 app_ctx_name = ctx->u.app_ctx.ctx_name;
1618 }
2f77fc4b
DG
1619
1620 switch (domain) {
1621 case LTTNG_DOMAIN_KERNEL:
979e618e
DG
1622 assert(session->kernel_session);
1623
1624 if (session->kernel_session->channel_count == 0) {
1625 /* Create default channel */
1626 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1627 if (ret != LTTNG_OK) {
1628 goto error;
1629 }
d5979e4a 1630 chan_kern_created = 1;
979e618e 1631 }
2f77fc4b 1632 /* Add kernel context to kernel tracer */
601d5acf 1633 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
f73fabfd 1634 if (ret != LTTNG_OK) {
2f77fc4b
DG
1635 goto error;
1636 }
1637 break;
bdf64013
JG
1638 case LTTNG_DOMAIN_JUL:
1639 case LTTNG_DOMAIN_LOG4J:
1640 {
1641 /*
1642 * Validate channel name.
1643 * If no channel name is given and the domain is JUL or LOG4J,
1644 * set it to the appropriate domain-specific channel name. If
1645 * a name is provided but does not match the expexted channel
1646 * name, return an error.
1647 */
1648 if (domain == LTTNG_DOMAIN_JUL && *channel_name &&
1649 strcmp(channel_name,
1650 DEFAULT_JUL_CHANNEL_NAME)) {
1651 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1652 goto error;
1653 } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name &&
1654 strcmp(channel_name,
1655 DEFAULT_LOG4J_CHANNEL_NAME)) {
1656 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1657 goto error;
1658 }
a93b3916 1659 /* break is _not_ missing here. */
bdf64013 1660 }
2f77fc4b
DG
1661 case LTTNG_DOMAIN_UST:
1662 {
1663 struct ltt_ust_session *usess = session->ust_session;
85076754
MD
1664 unsigned int chan_count;
1665
2f77fc4b
DG
1666 assert(usess);
1667
85076754 1668 chan_count = lttng_ht_get_count(usess->domain_global.channels);
979e618e
DG
1669 if (chan_count == 0) {
1670 struct lttng_channel *attr;
1671 /* Create default channel */
0a9c6494 1672 attr = channel_new_default_attr(domain, usess->buffer_type);
979e618e
DG
1673 if (attr == NULL) {
1674 ret = LTTNG_ERR_FATAL;
1675 goto error;
1676 }
1677
7972aab2 1678 ret = channel_ust_create(usess, attr, usess->buffer_type);
979e618e
DG
1679 if (ret != LTTNG_OK) {
1680 free(attr);
1681 goto error;
1682 }
1683 free(attr);
d5979e4a 1684 chan_ust_created = 1;
979e618e
DG
1685 }
1686
601d5acf 1687 ret = context_ust_add(usess, domain, ctx, channel_name);
bdf64013
JG
1688 free(app_ctx_provider_name);
1689 free(app_ctx_name);
1690 app_ctx_name = NULL;
1691 app_ctx_provider_name = NULL;
f73fabfd 1692 if (ret != LTTNG_OK) {
2f77fc4b
DG
1693 goto error;
1694 }
1695 break;
1696 }
2f77fc4b 1697 default:
f73fabfd 1698 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1699 goto error;
1700 }
1701
bdf64013
JG
1702 ret = LTTNG_OK;
1703 goto end;
2f77fc4b
DG
1704
1705error:
d5979e4a
DG
1706 if (chan_kern_created) {
1707 struct ltt_kernel_channel *kchan =
1708 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1709 session->kernel_session);
1710 /* Created previously, this should NOT fail. */
1711 assert(kchan);
1712 kernel_destroy_channel(kchan);
1713 }
1714
1715 if (chan_ust_created) {
1716 struct ltt_ust_channel *uchan =
1717 trace_ust_find_channel_by_name(
1718 session->ust_session->domain_global.channels,
1719 DEFAULT_CHANNEL_NAME);
1720 /* Created previously, this should NOT fail. */
1721 assert(uchan);
1722 /* Remove from the channel list of the session. */
1723 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1724 uchan);
1725 trace_ust_destroy_channel(uchan);
1726 }
bdf64013
JG
1727end:
1728 free(app_ctx_provider_name);
1729 free(app_ctx_name);
2f77fc4b
DG
1730 return ret;
1731}
1732
930a2e99
JG
1733static int validate_event_name(const char *name)
1734{
1735 int ret = 0;
1736 const char *c = name;
1737 const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN;
bf9807db 1738 bool null_terminated = false;
930a2e99
JG
1739
1740 /*
1741 * Make sure that unescaped wildcards are only used as the last
1742 * character of the event name.
1743 */
1744 while (c < event_name_end) {
1745 switch (*c) {
1746 case '\0':
bf9807db 1747 null_terminated = true;
930a2e99
JG
1748 goto end;
1749 case '\\':
1750 c++;
1751 break;
1752 case '*':
1753 if ((c + 1) < event_name_end && *(c + 1)) {
1754 /* Wildcard is not the last character */
1755 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1756 goto end;
1757 }
1758 default:
1759 break;
1760 }
1761 c++;
1762 }
1763end:
bf9807db
JG
1764 if (!ret && !null_terminated) {
1765 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1766 }
930a2e99
JG
1767 return ret;
1768}
1769
dac8e046
JG
1770static inline bool name_starts_with(const char *name, const char *prefix)
1771{
1772 const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
1773
1774 return !strncmp(name, prefix, max_cmp_len);
1775}
1776
1777/* Perform userspace-specific event name validation */
1778static int validate_ust_event_name(const char *name)
1779{
1780 int ret = 0;
1781
1782 if (!name) {
1783 ret = -1;
1784 goto end;
1785 }
1786
1787 /*
1788 * Check name against all internal UST event component namespaces used
1789 * by the agents.
1790 */
1791 if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) ||
1792 name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) ||
1793 name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) {
1794 ret = -1;
1795 }
1796
1797end:
1798 return ret;
1799}
88f06f15 1800
2f77fc4b 1801/*
88f06f15
JG
1802 * Internal version of cmd_enable_event() with a supplemental
1803 * "internal_event" flag which is used to enable internal events which should
1804 * be hidden from clients. Such events are used in the agent implementation to
1805 * enable the events through which all "agent" events are funeled.
2f77fc4b 1806 */
88f06f15
JG
1807static int _cmd_enable_event(struct ltt_session *session,
1808 struct lttng_domain *domain,
025faf73 1809 char *channel_name, struct lttng_event *event,
6b453b5e 1810 char *filter_expression,
db8f1377
JI
1811 struct lttng_filter_bytecode *filter,
1812 struct lttng_event_exclusion *exclusion,
88f06f15 1813 int wpipe, bool internal_event)
2f77fc4b 1814{
e5f5db7f 1815 int ret, channel_created = 0;
cfedea03 1816 struct lttng_channel *attr = NULL;
2f77fc4b
DG
1817
1818 assert(session);
1819 assert(event);
1820 assert(channel_name);
1821
2a385866
JG
1822 /* If we have a filter, we must have its filter expression */
1823 assert(!(!!filter_expression ^ !!filter));
1824
18a720cd
MD
1825 DBG("Enable event command for event \'%s\'", event->name);
1826
f5ac4bd7
MD
1827 rcu_read_lock();
1828
930a2e99
JG
1829 ret = validate_event_name(event->name);
1830 if (ret) {
1831 goto error;
1832 }
1833
7972aab2 1834 switch (domain->type) {
2f77fc4b
DG
1835 case LTTNG_DOMAIN_KERNEL:
1836 {
1837 struct ltt_kernel_channel *kchan;
1838
85076754
MD
1839 /*
1840 * If a non-default channel has been created in the
1841 * session, explicitely require that -c chan_name needs
1842 * to be provided.
1843 */
1844 if (session->kernel_session->has_non_default_channel
1845 && channel_name[0] == '\0') {
1846 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1847 goto error;
1848 }
1849
2f77fc4b
DG
1850 kchan = trace_kernel_get_channel_by_name(channel_name,
1851 session->kernel_session);
1852 if (kchan == NULL) {
0a9c6494
DG
1853 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1854 LTTNG_BUFFER_GLOBAL);
2f77fc4b 1855 if (attr == NULL) {
f73fabfd 1856 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1857 goto error;
1858 }
04c17253
MD
1859 if (lttng_strncpy(attr->name, channel_name,
1860 sizeof(attr->name))) {
1861 ret = LTTNG_ERR_INVALID;
04c17253
MD
1862 goto error;
1863 }
2f77fc4b
DG
1864
1865 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1866 if (ret != LTTNG_OK) {
2f77fc4b
DG
1867 goto error;
1868 }
e5f5db7f 1869 channel_created = 1;
2f77fc4b
DG
1870 }
1871
1872 /* Get the newly created kernel channel pointer */
1873 kchan = trace_kernel_get_channel_by_name(channel_name,
1874 session->kernel_session);
1875 if (kchan == NULL) {
1876 /* This sould not happen... */
f73fabfd 1877 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1878 goto error;
1879 }
1880
6e911cad
MD
1881 switch (event->type) {
1882 case LTTNG_EVENT_ALL:
29c62722 1883 {
00a62084
MD
1884 char *filter_expression_a = NULL;
1885 struct lttng_filter_bytecode *filter_a = NULL;
1886
1887 /*
1888 * We need to duplicate filter_expression and filter,
1889 * because ownership is passed to first enable
1890 * event.
1891 */
1892 if (filter_expression) {
1893 filter_expression_a = strdup(filter_expression);
1894 if (!filter_expression_a) {
1895 ret = LTTNG_ERR_FATAL;
1896 goto error;
1897 }
1898 }
1899 if (filter) {
1900 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
1901 if (!filter_a) {
1902 free(filter_expression_a);
1903 ret = LTTNG_ERR_FATAL;
1904 goto error;
1905 }
1906 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
1907 }
29c62722 1908 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
00a62084
MD
1909 ret = event_kernel_enable_event(kchan, event,
1910 filter_expression, filter);
a969e101
MD
1911 /* We have passed ownership */
1912 filter_expression = NULL;
1913 filter = NULL;
29c62722
MD
1914 if (ret != LTTNG_OK) {
1915 if (channel_created) {
1916 /* Let's not leak a useless channel. */
1917 kernel_destroy_channel(kchan);
1918 }
00a62084
MD
1919 free(filter_expression_a);
1920 free(filter_a);
29c62722
MD
1921 goto error;
1922 }
1923 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
00a62084
MD
1924 ret = event_kernel_enable_event(kchan, event,
1925 filter_expression_a, filter_a);
60d21fa2
AB
1926 /* We have passed ownership */
1927 filter_expression_a = NULL;
1928 filter_a = NULL;
29c62722
MD
1929 if (ret != LTTNG_OK) {
1930 goto error;
1931 }
1932 break;
1933 }
6e6ef3d7
DG
1934 case LTTNG_EVENT_PROBE:
1935 case LTTNG_EVENT_FUNCTION:
1936 case LTTNG_EVENT_FUNCTION_ENTRY:
6e911cad 1937 case LTTNG_EVENT_TRACEPOINT:
00a62084
MD
1938 ret = event_kernel_enable_event(kchan, event,
1939 filter_expression, filter);
a969e101
MD
1940 /* We have passed ownership */
1941 filter_expression = NULL;
1942 filter = NULL;
6e911cad
MD
1943 if (ret != LTTNG_OK) {
1944 if (channel_created) {
1945 /* Let's not leak a useless channel. */
1946 kernel_destroy_channel(kchan);
1947 }
1948 goto error;
e5f5db7f 1949 }
6e911cad
MD
1950 break;
1951 case LTTNG_EVENT_SYSCALL:
00a62084
MD
1952 ret = event_kernel_enable_event(kchan, event,
1953 filter_expression, filter);
a969e101
MD
1954 /* We have passed ownership */
1955 filter_expression = NULL;
1956 filter = NULL;
e2b957af
MD
1957 if (ret != LTTNG_OK) {
1958 goto error;
1959 }
6e911cad
MD
1960 break;
1961 default:
1962 ret = LTTNG_ERR_UNK;
2f77fc4b
DG
1963 goto error;
1964 }
1965
1966 kernel_wait_quiescent(kernel_tracer_fd);
1967 break;
1968 }
1969 case LTTNG_DOMAIN_UST:
1970 {
1971 struct ltt_ust_channel *uchan;
1972 struct ltt_ust_session *usess = session->ust_session;
1973
1974 assert(usess);
1975
85076754
MD
1976 /*
1977 * If a non-default channel has been created in the
1978 * session, explicitely require that -c chan_name needs
1979 * to be provided.
1980 */
1981 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1982 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1983 goto error;
1984 }
1985
2f77fc4b
DG
1986 /* Get channel from global UST domain */
1987 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1988 channel_name);
1989 if (uchan == NULL) {
1990 /* Create default channel */
0a9c6494
DG
1991 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1992 usess->buffer_type);
2f77fc4b 1993 if (attr == NULL) {
f73fabfd 1994 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1995 goto error;
1996 }
04c17253
MD
1997 if (lttng_strncpy(attr->name, channel_name,
1998 sizeof(attr->name))) {
1999 ret = LTTNG_ERR_INVALID;
04c17253
MD
2000 goto error;
2001 }
2f77fc4b
DG
2002
2003 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 2004 if (ret != LTTNG_OK) {
2f77fc4b
DG
2005 goto error;
2006 }
2f77fc4b
DG
2007
2008 /* Get the newly created channel reference back */
2009 uchan = trace_ust_find_channel_by_name(
2010 usess->domain_global.channels, channel_name);
2011 assert(uchan);
2012 }
2013
141feb8c
JG
2014 if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) {
2015 /*
2016 * Don't allow users to add UST events to channels which
2017 * are assigned to a userspace subdomain (JUL, Log4J,
2018 * Python, etc.).
2019 */
2020 ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN;
2021 goto error;
2022 }
2023
dac8e046
JG
2024 if (!internal_event) {
2025 /*
2026 * Ensure the event name is not reserved for internal
2027 * use.
2028 */
2029 ret = validate_ust_event_name(event->name);
2030 if (ret) {
2031 WARN("Userspace event name %s failed validation.",
2032 event->name ?
2033 event->name : "NULL");
2034 ret = LTTNG_ERR_INVALID_EVENT_NAME;
2035 goto error;
2036 }
2037 }
2038
2f77fc4b 2039 /* At this point, the session and channel exist on the tracer */
6b453b5e 2040 ret = event_ust_enable_tracepoint(usess, uchan, event,
88f06f15
JG
2041 filter_expression, filter, exclusion,
2042 internal_event);
49d21f93
MD
2043 /* We have passed ownership */
2044 filter_expression = NULL;
2045 filter = NULL;
2046 exclusion = NULL;
94382e15
JG
2047 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2048 goto already_enabled;
2049 } else if (ret != LTTNG_OK) {
2f77fc4b
DG
2050 goto error;
2051 }
2052 break;
2053 }
5cdb6027 2054 case LTTNG_DOMAIN_LOG4J:
f20baf8e 2055 case LTTNG_DOMAIN_JUL:
0e115563 2056 case LTTNG_DOMAIN_PYTHON:
f20baf8e 2057 {
da6c3a50 2058 const char *default_event_name, *default_chan_name;
fefd409b 2059 struct agent *agt;
f20baf8e
DG
2060 struct lttng_event uevent;
2061 struct lttng_domain tmp_dom;
2062 struct ltt_ust_session *usess = session->ust_session;
2063
2064 assert(usess);
2065
5cdb6027 2066 agt = trace_ust_find_agent(usess, domain->type);
fefd409b 2067 if (!agt) {
5cdb6027 2068 agt = agent_create(domain->type);
fefd409b 2069 if (!agt) {
e5b3c48c 2070 ret = LTTNG_ERR_NOMEM;
fefd409b
DG
2071 goto error;
2072 }
2073 agent_add(agt, usess->agents);
2074 }
2075
022d91ba 2076 /* Create the default tracepoint. */
996de3c7 2077 memset(&uevent, 0, sizeof(uevent));
f20baf8e
DG
2078 uevent.type = LTTNG_EVENT_TRACEPOINT;
2079 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
51755dc8
JG
2080 default_event_name = event_get_default_agent_ust_name(
2081 domain->type);
da6c3a50 2082 if (!default_event_name) {
e5b3c48c 2083 ret = LTTNG_ERR_FATAL;
da6c3a50 2084 goto error;
f43f95a9 2085 }
da6c3a50 2086 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
f20baf8e
DG
2087 uevent.name[sizeof(uevent.name) - 1] = '\0';
2088
2089 /*
2090 * The domain type is changed because we are about to enable the
2091 * default channel and event for the JUL domain that are hardcoded.
2092 * This happens in the UST domain.
2093 */
2094 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
2095 tmp_dom.type = LTTNG_DOMAIN_UST;
2096
0e115563
DG
2097 switch (domain->type) {
2098 case LTTNG_DOMAIN_LOG4J:
da6c3a50 2099 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
0e115563
DG
2100 break;
2101 case LTTNG_DOMAIN_JUL:
da6c3a50 2102 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
0e115563
DG
2103 break;
2104 case LTTNG_DOMAIN_PYTHON:
2105 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
2106 break;
2107 default:
e98a44b0 2108 /* The switch/case we are in makes this impossible */
0e115563 2109 assert(0);
da6c3a50
DG
2110 }
2111
971da06a 2112 {
8404118c 2113 char *filter_expression_copy = NULL;
51755dc8 2114 struct lttng_filter_bytecode *filter_copy = NULL;
971da06a
JG
2115
2116 if (filter) {
51755dc8
JG
2117 const size_t filter_size = sizeof(
2118 struct lttng_filter_bytecode)
2119 + filter->len;
2120
2121 filter_copy = zmalloc(filter_size);
971da06a 2122 if (!filter_copy) {
018096a4 2123 ret = LTTNG_ERR_NOMEM;
b742e3e2 2124 goto error;
971da06a 2125 }
51755dc8 2126 memcpy(filter_copy, filter, filter_size);
971da06a 2127
8404118c
JG
2128 filter_expression_copy =
2129 strdup(filter_expression);
2130 if (!filter_expression) {
2131 ret = LTTNG_ERR_NOMEM;
51755dc8
JG
2132 }
2133
2134 if (!filter_expression_copy || !filter_copy) {
2135 free(filter_expression_copy);
2136 free(filter_copy);
2137 goto error;
8404118c 2138 }
971da06a
JG
2139 }
2140
88f06f15 2141 ret = cmd_enable_event_internal(session, &tmp_dom,
971da06a 2142 (char *) default_chan_name,
8404118c
JG
2143 &uevent, filter_expression_copy,
2144 filter_copy, NULL, wpipe);
971da06a
JG
2145 }
2146
94382e15
JG
2147 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2148 goto already_enabled;
2149 } else if (ret != LTTNG_OK) {
f20baf8e
DG
2150 goto error;
2151 }
2152
2153 /* The wild card * means that everything should be enabled. */
2154 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
8404118c
JG
2155 ret = event_agent_enable_all(usess, agt, event, filter,
2156 filter_expression);
f20baf8e 2157 } else {
8404118c
JG
2158 ret = event_agent_enable(usess, agt, event, filter,
2159 filter_expression);
f20baf8e 2160 }
51755dc8
JG
2161 filter = NULL;
2162 filter_expression = NULL;
f20baf8e
DG
2163 if (ret != LTTNG_OK) {
2164 goto error;
2165 }
2166
2167 break;
2168 }
2f77fc4b 2169 default:
f73fabfd 2170 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2171 goto error;
2172 }
2173
f73fabfd 2174 ret = LTTNG_OK;
2f77fc4b 2175
94382e15 2176already_enabled:
2f77fc4b 2177error:
49d21f93
MD
2178 free(filter_expression);
2179 free(filter);
2180 free(exclusion);
cfedea03 2181 free(attr);
2223c96f 2182 rcu_read_unlock();
2f77fc4b
DG
2183 return ret;
2184}
2185
88f06f15
JG
2186/*
2187 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2188 * We own filter, exclusion, and filter_expression.
2189 */
2190int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
2191 char *channel_name, struct lttng_event *event,
2192 char *filter_expression,
2193 struct lttng_filter_bytecode *filter,
2194 struct lttng_event_exclusion *exclusion,
2195 int wpipe)
2196{
2197 return _cmd_enable_event(session, domain, channel_name, event,
2198 filter_expression, filter, exclusion, wpipe, false);
2199}
2200
2201/*
2202 * Enable an event which is internal to LTTng. An internal should
2203 * never be made visible to clients and are immune to checks such as
2204 * reserved names.
2205 */
2206static int cmd_enable_event_internal(struct ltt_session *session,
2207 struct lttng_domain *domain,
2208 char *channel_name, struct lttng_event *event,
2209 char *filter_expression,
2210 struct lttng_filter_bytecode *filter,
2211 struct lttng_event_exclusion *exclusion,
2212 int wpipe)
2213{
2214 return _cmd_enable_event(session, domain, channel_name, event,
2215 filter_expression, filter, exclusion, wpipe, true);
2216}
2217
2f77fc4b
DG
2218/*
2219 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2220 */
56a37563
JG
2221ssize_t cmd_list_tracepoints(enum lttng_domain_type domain,
2222 struct lttng_event **events)
2f77fc4b
DG
2223{
2224 int ret;
2225 ssize_t nb_events = 0;
2226
2227 switch (domain) {
2228 case LTTNG_DOMAIN_KERNEL:
2229 nb_events = kernel_list_events(kernel_tracer_fd, events);
2230 if (nb_events < 0) {
f73fabfd 2231 ret = LTTNG_ERR_KERN_LIST_FAIL;
2f77fc4b
DG
2232 goto error;
2233 }
2234 break;
2235 case LTTNG_DOMAIN_UST:
2236 nb_events = ust_app_list_events(events);
2237 if (nb_events < 0) {
f73fabfd 2238 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
2239 goto error;
2240 }
2241 break;
5cdb6027 2242 case LTTNG_DOMAIN_LOG4J:
3c6a091f 2243 case LTTNG_DOMAIN_JUL:
0e115563 2244 case LTTNG_DOMAIN_PYTHON:
f60140a1 2245 nb_events = agent_list_events(events, domain);
3c6a091f
DG
2246 if (nb_events < 0) {
2247 ret = LTTNG_ERR_UST_LIST_FAIL;
2248 goto error;
2249 }
2250 break;
2f77fc4b 2251 default:
f73fabfd 2252 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2253 goto error;
2254 }
2255
2256 return nb_events;
2257
2258error:
2259 /* Return negative value to differentiate return code */
2260 return -ret;
2261}
2262
2263/*
2264 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2265 */
56a37563 2266ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain,
2f77fc4b
DG
2267 struct lttng_event_field **fields)
2268{
2269 int ret;
2270 ssize_t nb_fields = 0;
2271
2272 switch (domain) {
2273 case LTTNG_DOMAIN_UST:
2274 nb_fields = ust_app_list_event_fields(fields);
2275 if (nb_fields < 0) {
f73fabfd 2276 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
2277 goto error;
2278 }
2279 break;
2280 case LTTNG_DOMAIN_KERNEL:
2281 default: /* fall-through */
f73fabfd 2282 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2283 goto error;
2284 }
2285
2286 return nb_fields;
2287
2288error:
2289 /* Return negative value to differentiate return code */
2290 return -ret;
2291}
2292
834978fd
DG
2293ssize_t cmd_list_syscalls(struct lttng_event **events)
2294{
2295 return syscall_table_list(events);
2296}
2297
a5dfbb9d
MD
2298/*
2299 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2300 *
2301 * Called with session lock held.
2302 */
2303ssize_t cmd_list_tracker_pids(struct ltt_session *session,
56a37563 2304 enum lttng_domain_type domain, int32_t **pids)
a5dfbb9d
MD
2305{
2306 int ret;
2307 ssize_t nr_pids = 0;
2308
2309 switch (domain) {
2310 case LTTNG_DOMAIN_KERNEL:
2311 {
2312 struct ltt_kernel_session *ksess;
2313
2314 ksess = session->kernel_session;
2315 nr_pids = kernel_list_tracker_pids(ksess, pids);
2316 if (nr_pids < 0) {
2317 ret = LTTNG_ERR_KERN_LIST_FAIL;
2318 goto error;
2319 }
2320 break;
2321 }
2322 case LTTNG_DOMAIN_UST:
2323 {
2324 struct ltt_ust_session *usess;
2325
2326 usess = session->ust_session;
2327 nr_pids = trace_ust_list_tracker_pids(usess, pids);
2328 if (nr_pids < 0) {
2329 ret = LTTNG_ERR_UST_LIST_FAIL;
2330 goto error;
2331 }
2332 break;
2333 }
2334 case LTTNG_DOMAIN_LOG4J:
2335 case LTTNG_DOMAIN_JUL:
2336 case LTTNG_DOMAIN_PYTHON:
2337 default:
2338 ret = LTTNG_ERR_UND;
2339 goto error;
2340 }
2341
2342 return nr_pids;
2343
2344error:
2345 /* Return negative value to differentiate return code */
2346 return -ret;
2347}
2348
2f77fc4b
DG
2349/*
2350 * Command LTTNG_START_TRACE processed by the client thread.
a9ad0c8f
MD
2351 *
2352 * Called with session mutex held.
2f77fc4b
DG
2353 */
2354int cmd_start_trace(struct ltt_session *session)
2355{
2356 int ret;
cde3e505 2357 unsigned long nb_chan = 0;
2f77fc4b
DG
2358 struct ltt_kernel_session *ksession;
2359 struct ltt_ust_session *usess;
2f77fc4b
DG
2360
2361 assert(session);
2362
2363 /* Ease our life a bit ;) */
2364 ksession = session->kernel_session;
2365 usess = session->ust_session;
2366
8382cf6f
DG
2367 /* Is the session already started? */
2368 if (session->active) {
f73fabfd 2369 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2370 goto error;
2371 }
2372
cde3e505
DG
2373 /*
2374 * Starting a session without channel is useless since after that it's not
2375 * possible to enable channel thus inform the client.
2376 */
2377 if (usess && usess->domain_global.channels) {
2378 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
2379 }
2380 if (ksession) {
2381 nb_chan += ksession->channel_count;
2382 }
2383 if (!nb_chan) {
2384 ret = LTTNG_ERR_NO_CHANNEL;
2385 goto error;
2386 }
2387
2f77fc4b
DG
2388 /* Kernel tracing */
2389 if (ksession != NULL) {
9b6c7ec5
DG
2390 ret = start_kernel_session(ksession, kernel_tracer_fd);
2391 if (ret != LTTNG_OK) {
2f77fc4b
DG
2392 goto error;
2393 }
2f77fc4b
DG
2394 }
2395
2396 /* Flag session that trace should start automatically */
2397 if (usess) {
14fb1ebe
DG
2398 /*
2399 * Even though the start trace might fail, flag this session active so
2400 * other application coming in are started by default.
2401 */
2402 usess->active = 1;
2f77fc4b
DG
2403
2404 ret = ust_app_start_trace_all(usess);
2405 if (ret < 0) {
f73fabfd 2406 ret = LTTNG_ERR_UST_START_FAIL;
2f77fc4b
DG
2407 goto error;
2408 }
2409 }
2410
8382cf6f
DG
2411 /* Flag this after a successful start. */
2412 session->has_been_started = 1;
2413 session->active = 1;
9b6c7ec5 2414
f73fabfd 2415 ret = LTTNG_OK;
2f77fc4b
DG
2416
2417error:
2418 return ret;
2419}
2420
2421/*
2422 * Command LTTNG_STOP_TRACE processed by the client thread.
2423 */
2424int cmd_stop_trace(struct ltt_session *session)
2425{
2426 int ret;
2427 struct ltt_kernel_channel *kchan;
2428 struct ltt_kernel_session *ksession;
2429 struct ltt_ust_session *usess;
2430
2431 assert(session);
2432
2433 /* Short cut */
2434 ksession = session->kernel_session;
2435 usess = session->ust_session;
2436
8382cf6f
DG
2437 /* Session is not active. Skip everythong and inform the client. */
2438 if (!session->active) {
f73fabfd 2439 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2f77fc4b
DG
2440 goto error;
2441 }
2442
2f77fc4b 2443 /* Kernel tracer */
14fb1ebe 2444 if (ksession && ksession->active) {
2f77fc4b
DG
2445 DBG("Stop kernel tracing");
2446
2447 /* Flush metadata if exist */
2448 if (ksession->metadata_stream_fd >= 0) {
2449 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2450 if (ret < 0) {
2451 ERR("Kernel metadata flush failed");
2452 }
2453 }
2454
2455 /* Flush all buffers before stopping */
2456 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2457 ret = kernel_flush_buffer(kchan);
2458 if (ret < 0) {
2459 ERR("Kernel flush buffer error");
2460 }
2461 }
2462
2463 ret = kernel_stop_session(ksession);
2464 if (ret < 0) {
f73fabfd 2465 ret = LTTNG_ERR_KERN_STOP_FAIL;
2f77fc4b
DG
2466 goto error;
2467 }
2468
2469 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5 2470
14fb1ebe 2471 ksession->active = 0;
2f77fc4b
DG
2472 }
2473
14fb1ebe
DG
2474 if (usess && usess->active) {
2475 /*
2476 * Even though the stop trace might fail, flag this session inactive so
2477 * other application coming in are not started by default.
2478 */
2479 usess->active = 0;
2f77fc4b
DG
2480
2481 ret = ust_app_stop_trace_all(usess);
2482 if (ret < 0) {
f73fabfd 2483 ret = LTTNG_ERR_UST_STOP_FAIL;
2f77fc4b
DG
2484 goto error;
2485 }
2486 }
2487
8382cf6f
DG
2488 /* Flag inactive after a successful stop. */
2489 session->active = 0;
f73fabfd 2490 ret = LTTNG_OK;
2f77fc4b
DG
2491
2492error:
2493 return ret;
2494}
2495
2496/*
2497 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2498 */
bda32d56
JG
2499int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2500 struct lttng_uri *uris)
2f77fc4b
DG
2501{
2502 int ret, i;
2503 struct ltt_kernel_session *ksess = session->kernel_session;
2504 struct ltt_ust_session *usess = session->ust_session;
2f77fc4b
DG
2505
2506 assert(session);
2507 assert(uris);
2508 assert(nb_uri > 0);
2509
8382cf6f
DG
2510 /* Can't set consumer URI if the session is active. */
2511 if (session->active) {
f73fabfd 2512 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2513 goto error;
2514 }
2515
bda32d56 2516 /* Set the "global" consumer URIs */
2f77fc4b 2517 for (i = 0; i < nb_uri; i++) {
bda32d56
JG
2518 ret = add_uri_to_consumer(session->consumer,
2519 &uris[i], 0, session->name);
a74934ba 2520 if (ret != LTTNG_OK) {
2f77fc4b
DG
2521 goto error;
2522 }
2f77fc4b
DG
2523 }
2524
bda32d56
JG
2525 /* Set UST session URIs */
2526 if (session->ust_session) {
2527 for (i = 0; i < nb_uri; i++) {
2528 ret = add_uri_to_consumer(
2529 session->ust_session->consumer,
2530 &uris[i], LTTNG_DOMAIN_UST,
2531 session->name);
2532 if (ret != LTTNG_OK) {
2533 goto error;
2534 }
2535 }
2536 }
2537
2538 /* Set kernel session URIs */
2539 if (session->kernel_session) {
2540 for (i = 0; i < nb_uri; i++) {
2541 ret = add_uri_to_consumer(
2542 session->kernel_session->consumer,
2543 &uris[i], LTTNG_DOMAIN_KERNEL,
2544 session->name);
2545 if (ret != LTTNG_OK) {
2546 goto error;
2547 }
2548 }
2549 }
2550
7ab70fe0
DG
2551 /*
2552 * Make sure to set the session in output mode after we set URI since a
2553 * session can be created without URL (thus flagged in no output mode).
2554 */
2555 session->output_traces = 1;
2556 if (ksess) {
2557 ksess->output_traces = 1;
bda32d56
JG
2558 }
2559
2560 if (usess) {
7ab70fe0
DG
2561 usess->output_traces = 1;
2562 }
2563
2f77fc4b 2564 /* All good! */
f73fabfd 2565 ret = LTTNG_OK;
2f77fc4b
DG
2566
2567error:
2568 return ret;
2569}
2570
2571/*
2572 * Command LTTNG_CREATE_SESSION processed by the client thread.
2573 */
2574int cmd_create_session_uri(char *name, struct lttng_uri *uris,
ecc48a90 2575 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2f77fc4b
DG
2576{
2577 int ret;
2f77fc4b
DG
2578 struct ltt_session *session;
2579
2580 assert(name);
2bba9e53 2581 assert(creds);
785d2d0d 2582
2f77fc4b
DG
2583 /*
2584 * Verify if the session already exist
2585 *
2586 * XXX: There is no need for the session lock list here since the caller
2587 * (process_client_msg) is holding it. We might want to change that so a
2588 * single command does not lock the entire session list.
2589 */
2590 session = session_find_by_name(name);
2591 if (session != NULL) {
f73fabfd 2592 ret = LTTNG_ERR_EXIST_SESS;
2f77fc4b
DG
2593 goto find_error;
2594 }
2595
2596 /* Create tracing session in the registry */
dec56f6c 2597 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2f77fc4b 2598 LTTNG_SOCK_GET_GID_CRED(creds));
f73fabfd 2599 if (ret != LTTNG_OK) {
2f77fc4b
DG
2600 goto session_error;
2601 }
2602
2603 /*
2604 * Get the newly created session pointer back
2605 *
2606 * XXX: There is no need for the session lock list here since the caller
2607 * (process_client_msg) is holding it. We might want to change that so a
2608 * single command does not lock the entire session list.
2609 */
2610 session = session_find_by_name(name);
2611 assert(session);
2612
ecc48a90 2613 session->live_timer = live_timer;
2f77fc4b
DG
2614 /* Create default consumer output for the session not yet created. */
2615 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2616 if (session->consumer == NULL) {
f73fabfd 2617 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2618 goto consumer_error;
2619 }
2620
2bba9e53 2621 if (uris) {
bda32d56 2622 ret = cmd_set_consumer_uri(session, nb_uri, uris);
2bba9e53
DG
2623 if (ret != LTTNG_OK) {
2624 goto consumer_error;
2625 }
2626 session->output_traces = 1;
2627 } else {
2628 session->output_traces = 0;
2629 DBG2("Session %s created with no output", session->name);
2f77fc4b
DG
2630 }
2631
2632 session->consumer->enabled = 1;
2633
f73fabfd 2634 return LTTNG_OK;
2f77fc4b
DG
2635
2636consumer_error:
2637 session_destroy(session);
2638session_error:
2639find_error:
2640 return ret;
2641}
2642
27babd3a
DG
2643/*
2644 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2645 */
2646int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2647 size_t nb_uri, lttng_sock_cred *creds)
2648{
2649 int ret;
2650 struct ltt_session *session;
2651 struct snapshot_output *new_output = NULL;
2652
2653 assert(name);
2654 assert(creds);
2655
2656 /*
2657 * Create session in no output mode with URIs set to NULL. The uris we've
2658 * received are for a default snapshot output if one.
2659 */
ae58b817 2660 ret = cmd_create_session_uri(name, NULL, 0, creds, 0);
27babd3a
DG
2661 if (ret != LTTNG_OK) {
2662 goto error;
2663 }
2664
2665 /* Get the newly created session pointer back. This should NEVER fail. */
2666 session = session_find_by_name(name);
2667 assert(session);
2668
2669 /* Flag session for snapshot mode. */
2670 session->snapshot_mode = 1;
2671
2672 /* Skip snapshot output creation if no URI is given. */
2673 if (nb_uri == 0) {
2674 goto end;
2675 }
2676
2677 new_output = snapshot_output_alloc();
2678 if (!new_output) {
2679 ret = LTTNG_ERR_NOMEM;
2680 goto error_snapshot_alloc;
2681 }
2682
2683 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2684 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2685 if (ret < 0) {
2686 if (ret == -ENOMEM) {
2687 ret = LTTNG_ERR_NOMEM;
2688 } else {
2689 ret = LTTNG_ERR_INVALID;
2690 }
2691 goto error_snapshot;
2692 }
2693
2694 rcu_read_lock();
2695 snapshot_add_output(&session->snapshot, new_output);
2696 rcu_read_unlock();
2697
2698end:
2699 return LTTNG_OK;
2700
2701error_snapshot:
2702 snapshot_output_destroy(new_output);
2703error_snapshot_alloc:
2704 session_destroy(session);
2705error:
2706 return ret;
2707}
2708
2f77fc4b
DG
2709/*
2710 * Command LTTNG_DESTROY_SESSION processed by the client thread.
a9ad0c8f
MD
2711 *
2712 * Called with session lock held.
2f77fc4b
DG
2713 */
2714int cmd_destroy_session(struct ltt_session *session, int wpipe)
2715{
2716 int ret;
2717 struct ltt_ust_session *usess;
2718 struct ltt_kernel_session *ksess;
2719
2720 /* Safety net */
2721 assert(session);
2722
2723 usess = session->ust_session;
2724 ksess = session->kernel_session;
2725
2726 /* Clean kernel session teardown */
2727 kernel_destroy_session(ksess);
2728
2729 /* UST session teardown */
2730 if (usess) {
2731 /* Close any relayd session */
2732 consumer_output_send_destroy_relayd(usess->consumer);
2733
2734 /* Destroy every UST application related to this session. */
2735 ret = ust_app_destroy_trace_all(usess);
2736 if (ret) {
2737 ERR("Error in ust_app_destroy_trace_all");
2738 }
2739
2740 /* Clean up the rest. */
2741 trace_ust_destroy_session(usess);
2742 }
2743
2744 /*
2745 * Must notify the kernel thread here to update it's poll set in order to
2746 * remove the channel(s)' fd just destroyed.
2747 */
2748 ret = notify_thread_pipe(wpipe);
2749 if (ret < 0) {
2750 PERROR("write kernel poll pipe");
2751 }
2752
2753 ret = session_destroy(session);
2754
2755 return ret;
2756}
2757
2758/*
2759 * Command LTTNG_CALIBRATE processed by the client thread.
2760 */
56a37563
JG
2761int cmd_calibrate(enum lttng_domain_type domain,
2762 struct lttng_calibrate *calibrate)
2f77fc4b
DG
2763{
2764 int ret;
2765
2766 switch (domain) {
2767 case LTTNG_DOMAIN_KERNEL:
2768 {
2769 struct lttng_kernel_calibrate kcalibrate;
2770
2e84128e
DG
2771 switch (calibrate->type) {
2772 case LTTNG_CALIBRATE_FUNCTION:
2773 default:
2774 /* Default and only possible calibrate option. */
2775 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2776 break;
2777 }
2778
2f77fc4b
DG
2779 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2780 if (ret < 0) {
f73fabfd 2781 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2f77fc4b
DG
2782 goto error;
2783 }
2784 break;
2785 }
2786 case LTTNG_DOMAIN_UST:
2787 {
2788 struct lttng_ust_calibrate ucalibrate;
2789
2e84128e
DG
2790 switch (calibrate->type) {
2791 case LTTNG_CALIBRATE_FUNCTION:
2792 default:
2793 /* Default and only possible calibrate option. */
2794 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2795 break;
2796 }
2797
2f77fc4b
DG
2798 ret = ust_app_calibrate_glb(&ucalibrate);
2799 if (ret < 0) {
f73fabfd 2800 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2f77fc4b
DG
2801 goto error;
2802 }
2803 break;
2804 }
2805 default:
f73fabfd 2806 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2807 goto error;
2808 }
2809
f73fabfd 2810 ret = LTTNG_OK;
2f77fc4b
DG
2811
2812error:
2813 return ret;
2814}
2815
2816/*
2817 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2818 */
56a37563
JG
2819int cmd_register_consumer(struct ltt_session *session,
2820 enum lttng_domain_type domain, const char *sock_path,
2821 struct consumer_data *cdata)
2f77fc4b
DG
2822{
2823 int ret, sock;
dd81b457 2824 struct consumer_socket *socket = NULL;
2f77fc4b
DG
2825
2826 assert(session);
2827 assert(cdata);
2828 assert(sock_path);
2829
2830 switch (domain) {
2831 case LTTNG_DOMAIN_KERNEL:
2832 {
2833 struct ltt_kernel_session *ksess = session->kernel_session;
2834
2835 assert(ksess);
2836
2837 /* Can't register a consumer if there is already one */
2838 if (ksess->consumer_fds_sent != 0) {
f73fabfd 2839 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
2840 goto error;
2841 }
2842
2843 sock = lttcomm_connect_unix_sock(sock_path);
2844 if (sock < 0) {
f73fabfd 2845 ret = LTTNG_ERR_CONNECT_FAIL;
2f77fc4b
DG
2846 goto error;
2847 }
4ce514c4 2848 cdata->cmd_sock = sock;
2f77fc4b 2849
4ce514c4 2850 socket = consumer_allocate_socket(&cdata->cmd_sock);
2f77fc4b 2851 if (socket == NULL) {
f66c074c
DG
2852 ret = close(sock);
2853 if (ret < 0) {
2854 PERROR("close register consumer");
2855 }
4ce514c4 2856 cdata->cmd_sock = -1;
f73fabfd 2857 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2858 goto error;
2859 }
2860
2861 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2862 if (socket->lock == NULL) {
2863 PERROR("zmalloc pthread mutex");
f73fabfd 2864 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2865 goto error;
2866 }
2867 pthread_mutex_init(socket->lock, NULL);
2868 socket->registered = 1;
2869
2870 rcu_read_lock();
2871 consumer_add_socket(socket, ksess->consumer);
2872 rcu_read_unlock();
2873
2874 pthread_mutex_lock(&cdata->pid_mutex);
2875 cdata->pid = -1;
2876 pthread_mutex_unlock(&cdata->pid_mutex);
2877
2878 break;
2879 }
2880 default:
2881 /* TODO: Userspace tracing */
f73fabfd 2882 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2883 goto error;
2884 }
2885
dd81b457 2886 return LTTNG_OK;
2f77fc4b
DG
2887
2888error:
dd81b457
DG
2889 if (socket) {
2890 consumer_destroy_socket(socket);
2891 }
2f77fc4b
DG
2892 return ret;
2893}
2894
2895/*
2896 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2897 */
2898ssize_t cmd_list_domains(struct ltt_session *session,
2899 struct lttng_domain **domains)
2900{
2901 int ret, index = 0;
2902 ssize_t nb_dom = 0;
fefd409b
DG
2903 struct agent *agt;
2904 struct lttng_ht_iter iter;
2f77fc4b
DG
2905
2906 if (session->kernel_session != NULL) {
2907 DBG3("Listing domains found kernel domain");
2908 nb_dom++;
2909 }
2910
2911 if (session->ust_session != NULL) {
2912 DBG3("Listing domains found UST global domain");
2913 nb_dom++;
3c6a091f 2914
e0a74f01 2915 rcu_read_lock();
fefd409b
DG
2916 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2917 agt, node.node) {
2918 if (agt->being_used) {
2919 nb_dom++;
2920 }
3c6a091f 2921 }
e0a74f01 2922 rcu_read_unlock();
2f77fc4b
DG
2923 }
2924
fa64dfb4
JG
2925 if (!nb_dom) {
2926 goto end;
2927 }
2928
2f77fc4b
DG
2929 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2930 if (*domains == NULL) {
f73fabfd 2931 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2932 goto error;
2933 }
2934
2935 if (session->kernel_session != NULL) {
2936 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
b5edb9e8
PP
2937
2938 /* Kernel session buffer type is always GLOBAL */
2939 (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL;
2940
2f77fc4b
DG
2941 index++;
2942 }
2943
2944 if (session->ust_session != NULL) {
2945 (*domains)[index].type = LTTNG_DOMAIN_UST;
88c5f0d8 2946 (*domains)[index].buf_type = session->ust_session->buffer_type;
2f77fc4b 2947 index++;
3c6a091f 2948
e0a74f01 2949 rcu_read_lock();
fefd409b
DG
2950 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2951 agt, node.node) {
2952 if (agt->being_used) {
2953 (*domains)[index].type = agt->domain;
2954 (*domains)[index].buf_type = session->ust_session->buffer_type;
2955 index++;
2956 }
3c6a091f 2957 }
e0a74f01 2958 rcu_read_unlock();
2f77fc4b 2959 }
fa64dfb4 2960end:
2f77fc4b
DG
2961 return nb_dom;
2962
2963error:
f73fabfd
DG
2964 /* Return negative value to differentiate return code */
2965 return -ret;
2f77fc4b
DG
2966}
2967
2968
2969/*
2970 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2971 */
56a37563
JG
2972ssize_t cmd_list_channels(enum lttng_domain_type domain,
2973 struct ltt_session *session, struct lttng_channel **channels)
2f77fc4b 2974{
53e367f9 2975 ssize_t nb_chan = 0, payload_size = 0, ret;
2f77fc4b
DG
2976
2977 switch (domain) {
2978 case LTTNG_DOMAIN_KERNEL:
2979 if (session->kernel_session != NULL) {
2980 nb_chan = session->kernel_session->channel_count;
2981 }
2982 DBG3("Number of kernel channels %zd", nb_chan);
c7d620a2 2983 if (nb_chan <= 0) {
53e367f9
JG
2984 ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2985 goto end;
c7d620a2 2986 }
2f77fc4b
DG
2987 break;
2988 case LTTNG_DOMAIN_UST:
2989 if (session->ust_session != NULL) {
7ffc31a2 2990 rcu_read_lock();
2f77fc4b 2991 nb_chan = lttng_ht_get_count(
7ffc31a2
JG
2992 session->ust_session->domain_global.channels);
2993 rcu_read_unlock();
2f77fc4b
DG
2994 }
2995 DBG3("Number of UST global channels %zd", nb_chan);
ade7ce52 2996 if (nb_chan < 0) {
53e367f9
JG
2997 ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND;
2998 goto end;
c7d620a2 2999 }
2f77fc4b
DG
3000 break;
3001 default:
53e367f9
JG
3002 ret = -LTTNG_ERR_UND;
3003 goto end;
2f77fc4b
DG
3004 }
3005
3006 if (nb_chan > 0) {
53e367f9
JG
3007 const size_t channel_size = sizeof(struct lttng_channel) +
3008 sizeof(struct lttcomm_channel_extended);
3009 struct lttcomm_channel_extended *channel_exts;
3010
3011 payload_size = nb_chan * channel_size;
3012 *channels = zmalloc(payload_size);
2f77fc4b 3013 if (*channels == NULL) {
53e367f9
JG
3014 ret = -LTTNG_ERR_FATAL;
3015 goto end;
2f77fc4b
DG
3016 }
3017
53e367f9
JG
3018 channel_exts = ((void *) *channels) +
3019 (nb_chan * sizeof(struct lttng_channel));
3020 list_lttng_channels(domain, session, *channels, channel_exts);
3021 } else {
3022 *channels = NULL;
2f77fc4b
DG
3023 }
3024
53e367f9
JG
3025 ret = payload_size;
3026end:
3027 return ret;
2f77fc4b
DG
3028}
3029
3030/*
3031 * Command LTTNG_LIST_EVENTS processed by the client thread.
3032 */
56a37563
JG
3033ssize_t cmd_list_events(enum lttng_domain_type domain,
3034 struct ltt_session *session, char *channel_name,
b4e3ceb9 3035 struct lttng_event **events, size_t *total_size)
2f77fc4b
DG
3036{
3037 int ret = 0;
3038 ssize_t nb_event = 0;
3039
3040 switch (domain) {
3041 case LTTNG_DOMAIN_KERNEL:
3042 if (session->kernel_session != NULL) {
3043 nb_event = list_lttng_kernel_events(channel_name,
b4e3ceb9
PP
3044 session->kernel_session, events,
3045 total_size);
2f77fc4b
DG
3046 }
3047 break;
3048 case LTTNG_DOMAIN_UST:
3049 {
3050 if (session->ust_session != NULL) {
3051 nb_event = list_lttng_ust_global_events(channel_name,
b4e3ceb9
PP
3052 &session->ust_session->domain_global, events,
3053 total_size);
2f77fc4b
DG
3054 }
3055 break;
3056 }
5cdb6027 3057 case LTTNG_DOMAIN_LOG4J:
3c6a091f 3058 case LTTNG_DOMAIN_JUL:
0e115563 3059 case LTTNG_DOMAIN_PYTHON:
3c6a091f 3060 if (session->ust_session) {
fefd409b
DG
3061 struct lttng_ht_iter iter;
3062 struct agent *agt;
3063
b11feea5 3064 rcu_read_lock();
fefd409b
DG
3065 cds_lfht_for_each_entry(session->ust_session->agents->ht,
3066 &iter.iter, agt, node.node) {
1dfd9906
JG
3067 if (agt->domain == domain) {
3068 nb_event = list_lttng_agent_events(
b4e3ceb9
PP
3069 agt, events,
3070 total_size);
1dfd9906
JG
3071 break;
3072 }
fefd409b 3073 }
b11feea5 3074 rcu_read_unlock();
3c6a091f
DG
3075 }
3076 break;
2f77fc4b 3077 default:
f73fabfd 3078 ret = LTTNG_ERR_UND;
2f77fc4b
DG
3079 goto error;
3080 }
3081
f73fabfd 3082 return nb_event;
2f77fc4b
DG
3083
3084error:
f73fabfd
DG
3085 /* Return negative value to differentiate return code */
3086 return -ret;
2f77fc4b
DG
3087}
3088
3089/*
3090 * Using the session list, filled a lttng_session array to send back to the
3091 * client for session listing.
3092 *
3093 * The session list lock MUST be acquired before calling this function. Use
3094 * session_lock_list() and session_unlock_list().
3095 */
3096void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
3097 gid_t gid)
3098{
3099 int ret;
3100 unsigned int i = 0;
3101 struct ltt_session *session;
3102 struct ltt_session_list *list = session_get_list();
3103
3104 DBG("Getting all available session for UID %d GID %d",
3105 uid, gid);
3106 /*
3107 * Iterate over session list and append data after the control struct in
3108 * the buffer.
3109 */
3110 cds_list_for_each_entry(session, &list->head, list) {
3111 /*
3112 * Only list the sessions the user can control.
3113 */
3114 if (!session_access_ok(session, uid, gid)) {
3115 continue;
3116 }
3117
3118 struct ltt_kernel_session *ksess = session->kernel_session;
3119 struct ltt_ust_session *usess = session->ust_session;
3120
3121 if (session->consumer->type == CONSUMER_DST_NET ||
3122 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
3123 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
3124 ret = build_network_session_path(sessions[i].path,
dec56f6c 3125 sizeof(sessions[i].path), session);
2f77fc4b 3126 } else {
dec56f6c 3127 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2f77fc4b
DG
3128 session->consumer->dst.trace_path);
3129 }
3130 if (ret < 0) {
3131 PERROR("snprintf session path");
3132 continue;
3133 }
3134
3135 strncpy(sessions[i].name, session->name, NAME_MAX);
3136 sessions[i].name[NAME_MAX - 1] = '\0';
8382cf6f 3137 sessions[i].enabled = session->active;
2cbf8fed 3138 sessions[i].snapshot_mode = session->snapshot_mode;
8960e9cd 3139 sessions[i].live_timer_interval = session->live_timer;
2f77fc4b
DG
3140 i++;
3141 }
3142}
3143
806e2684 3144/*
6d805429 3145 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
d3f14b8a 3146 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
806e2684 3147 */
6d805429 3148int cmd_data_pending(struct ltt_session *session)
806e2684
DG
3149{
3150 int ret;
3151 struct ltt_kernel_session *ksess = session->kernel_session;
3152 struct ltt_ust_session *usess = session->ust_session;
3153
3154 assert(session);
3155
3156 /* Session MUST be stopped to ask for data availability. */
8382cf6f 3157 if (session->active) {
806e2684
DG
3158 ret = LTTNG_ERR_SESSION_STARTED;
3159 goto error;
3a89d11a
DG
3160 } else {
3161 /*
3162 * If stopped, just make sure we've started before else the above call
3163 * will always send that there is data pending.
3164 *
3165 * The consumer assumes that when the data pending command is received,
3166 * the trace has been started before or else no output data is written
3167 * by the streams which is a condition for data pending. So, this is
3168 * *VERY* important that we don't ask the consumer before a start
3169 * trace.
3170 */
8382cf6f 3171 if (!session->has_been_started) {
3a89d11a
DG
3172 ret = 0;
3173 goto error;
3174 }
806e2684
DG
3175 }
3176
3177 if (ksess && ksess->consumer) {
6d805429
DG
3178 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
3179 if (ret == 1) {
806e2684
DG
3180 /* Data is still being extracted for the kernel. */
3181 goto error;
3182 }
3183 }
3184
3185 if (usess && usess->consumer) {
6d805429
DG
3186 ret = consumer_is_data_pending(usess->id, usess->consumer);
3187 if (ret == 1) {
806e2684
DG
3188 /* Data is still being extracted for the kernel. */
3189 goto error;
3190 }
3191 }
3192
3193 /* Data is ready to be read by a viewer */
6d805429 3194 ret = 0;
806e2684
DG
3195
3196error:
3197 return ret;
3198}
3199
6dc3064a
DG
3200/*
3201 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
3202 *
3203 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3204 */
3205int cmd_snapshot_add_output(struct ltt_session *session,
3206 struct lttng_snapshot_output *output, uint32_t *id)
3207{
3208 int ret;
3209 struct snapshot_output *new_output;
3210
3211 assert(session);
3212 assert(output);
3213
3214 DBG("Cmd snapshot add output for session %s", session->name);
3215
3216 /*
d3f14b8a
MD
3217 * Permission denied to create an output if the session is not
3218 * set in no output mode.
6dc3064a
DG
3219 */
3220 if (session->output_traces) {
3221 ret = LTTNG_ERR_EPERM;
3222 goto error;
3223 }
3224
3225 /* Only one output is allowed until we have the "tee" feature. */
3226 if (session->snapshot.nb_output == 1) {
3227 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
3228 goto error;
3229 }
3230
3231 new_output = snapshot_output_alloc();
3232 if (!new_output) {
3233 ret = LTTNG_ERR_NOMEM;
3234 goto error;
3235 }
3236
3237 ret = snapshot_output_init(output->max_size, output->name,
3238 output->ctrl_url, output->data_url, session->consumer, new_output,
3239 &session->snapshot);
3240 if (ret < 0) {
3241 if (ret == -ENOMEM) {
3242 ret = LTTNG_ERR_NOMEM;
3243 } else {
3244 ret = LTTNG_ERR_INVALID;
3245 }
3246 goto free_error;
3247 }
3248
6dc3064a
DG
3249 rcu_read_lock();
3250 snapshot_add_output(&session->snapshot, new_output);
3251 if (id) {
3252 *id = new_output->id;
3253 }
3254 rcu_read_unlock();
3255
3256 return LTTNG_OK;
3257
3258free_error:
3259 snapshot_output_destroy(new_output);
3260error:
3261 return ret;
3262}
3263
3264/*
3265 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
3266 *
3267 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3268 */
3269int cmd_snapshot_del_output(struct ltt_session *session,
3270 struct lttng_snapshot_output *output)
3271{
3272 int ret;
eb240553 3273 struct snapshot_output *sout = NULL;
6dc3064a
DG
3274
3275 assert(session);
3276 assert(output);
3277
6dc3064a
DG
3278 rcu_read_lock();
3279
3280 /*
d3f14b8a
MD
3281 * Permission denied to create an output if the session is not
3282 * set in no output mode.
6dc3064a
DG
3283 */
3284 if (session->output_traces) {
3285 ret = LTTNG_ERR_EPERM;
3286 goto error;
3287 }
3288
eb240553
DG
3289 if (output->id) {
3290 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
3291 session->name);
3292 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
3293 } else if (*output->name != '\0') {
3294 DBG("Cmd snapshot del output name %s for session %s", output->name,
3295 session->name);
3296 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
3297 }
6dc3064a
DG
3298 if (!sout) {
3299 ret = LTTNG_ERR_INVALID;
3300 goto error;
3301 }
3302
3303 snapshot_delete_output(&session->snapshot, sout);
3304 snapshot_output_destroy(sout);
3305 ret = LTTNG_OK;
3306
3307error:
3308 rcu_read_unlock();
3309 return ret;
3310}
3311
3312/*
3313 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
3314 *
3315 * If no output is available, outputs is untouched and 0 is returned.
3316 *
3317 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
3318 */
3319ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
3320 struct lttng_snapshot_output **outputs)
3321{
3322 int ret, idx = 0;
b223ca94 3323 struct lttng_snapshot_output *list = NULL;
6dc3064a
DG
3324 struct lttng_ht_iter iter;
3325 struct snapshot_output *output;
3326
3327 assert(session);
3328 assert(outputs);
3329
3330 DBG("Cmd snapshot list outputs for session %s", session->name);
3331
3332 /*
d3f14b8a
MD
3333 * Permission denied to create an output if the session is not
3334 * set in no output mode.
6dc3064a
DG
3335 */
3336 if (session->output_traces) {
b223ca94 3337 ret = -LTTNG_ERR_EPERM;
6dc3064a
DG
3338 goto error;
3339 }
3340
3341 if (session->snapshot.nb_output == 0) {
3342 ret = 0;
3343 goto error;
3344 }
3345
3346 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
3347 if (!list) {
b223ca94 3348 ret = -LTTNG_ERR_NOMEM;
6dc3064a
DG
3349 goto error;
3350 }
3351
3352 /* Copy list from session to the new list object. */
b223ca94 3353 rcu_read_lock();
6dc3064a
DG
3354 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
3355 output, node.node) {
3356 assert(output->consumer);
3357 list[idx].id = output->id;
3358 list[idx].max_size = output->max_size;
6ce22875
MD
3359 if (lttng_strncpy(list[idx].name, output->name,
3360 sizeof(list[idx].name))) {
3361 ret = -LTTNG_ERR_INVALID;
3362 goto error;
3363 }
6dc3064a 3364 if (output->consumer->type == CONSUMER_DST_LOCAL) {
6ce22875
MD
3365 if (lttng_strncpy(list[idx].ctrl_url,
3366 output->consumer->dst.trace_path,