Tests: Clean-up test-crash on SIGTERM and SIGINT
[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
CommitLineData
2f77fc4b
DG
1/*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18#define _GNU_SOURCE
6c1c0768 19#define _LGPL_SOURCE
2f77fc4b 20#include <assert.h>
1f345e94 21#include <string.h>
6dc3064a 22#include <inttypes.h>
2f77fc4b
DG
23#include <urcu/list.h>
24#include <urcu/uatomic.h>
25
26#include <common/defaults.h>
27#include <common/common.h>
28#include <common/sessiond-comm/sessiond-comm.h>
29#include <common/relayd/relayd.h>
10a50311 30#include <common/utils.h>
2f77fc4b
DG
31
32#include "channel.h"
33#include "consumer.h"
34#include "event.h"
8782cc74 35#include "health-sessiond.h"
2f77fc4b
DG
36#include "kernel.h"
37#include "kernel-consumer.h"
38#include "lttng-sessiond.h"
39#include "utils.h"
834978fd 40#include "syscall.h"
7c1d2758 41#include "agent.h"
2f77fc4b
DG
42
43#include "cmd.h"
44
45/*
46 * Used to keep a unique index for each relayd socket created where this value
47 * is associated with streams on the consumer so it can match the right relayd
d88aee68
DG
48 * to send to. It must be accessed with the relayd_net_seq_idx_lock
49 * held.
2f77fc4b 50 */
d88aee68
DG
51static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
52static uint64_t relayd_net_seq_idx;
2f77fc4b 53
7076b56e
JG
54static int validate_event_name(const char *);
55static int validate_ust_event_name(const char *);
56static int cmd_enable_event_internal(struct ltt_session *session,
57 struct lttng_domain *domain,
58 char *channel_name, struct lttng_event *event,
59 char *filter_expression,
60 struct lttng_filter_bytecode *filter,
61 struct lttng_event_exclusion *exclusion,
62 int wpipe);
63
2f77fc4b
DG
64/*
65 * Create a session path used by list_lttng_sessions for the case that the
66 * session consumer is on the network.
67 */
68static int build_network_session_path(char *dst, size_t size,
69 struct ltt_session *session)
70{
71 int ret, kdata_port, udata_port;
72 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
73 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
74
75 assert(session);
76 assert(dst);
77
78 memset(tmp_urls, 0, sizeof(tmp_urls));
79 memset(tmp_uurl, 0, sizeof(tmp_uurl));
80
81 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
82
83 if (session->kernel_session && session->kernel_session->consumer) {
84 kuri = &session->kernel_session->consumer->dst.net.control;
85 kdata_port = session->kernel_session->consumer->dst.net.data.port;
86 }
87
88 if (session->ust_session && session->ust_session->consumer) {
89 uuri = &session->ust_session->consumer->dst.net.control;
90 udata_port = session->ust_session->consumer->dst.net.data.port;
91 }
92
93 if (uuri == NULL && kuri == NULL) {
94 uri = &session->consumer->dst.net.control;
95 kdata_port = session->consumer->dst.net.data.port;
96 } else if (kuri && uuri) {
97 ret = uri_compare(kuri, uuri);
98 if (ret) {
99 /* Not Equal */
100 uri = kuri;
101 /* Build uuri URL string */
102 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
103 if (ret < 0) {
104 goto error;
105 }
106 } else {
107 uri = kuri;
108 }
109 } else if (kuri && uuri == NULL) {
110 uri = kuri;
111 } else if (uuri && kuri == NULL) {
112 uri = uuri;
113 }
114
115 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
116 if (ret < 0) {
117 goto error;
118 }
119
9aa9f900
DG
120 /*
121 * Do we have a UST url set. If yes, this means we have both kernel and UST
122 * to print.
123 */
9d035200 124 if (*tmp_uurl != '\0') {
2f77fc4b
DG
125 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
126 tmp_urls, kdata_port, tmp_uurl, udata_port);
127 } else {
9aa9f900 128 int dport;
bef08707 129 if (kuri || (!kuri && !uuri)) {
9aa9f900
DG
130 dport = kdata_port;
131 } else {
132 /* No kernel URI, use the UST port. */
133 dport = udata_port;
134 }
135 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
2f77fc4b
DG
136 }
137
138error:
139 return ret;
140}
141
142/*
143 * Fill lttng_channel array of all channels.
144 */
56a37563
JG
145static void list_lttng_channels(enum lttng_domain_type domain,
146 struct ltt_session *session, struct lttng_channel *channels)
2f77fc4b
DG
147{
148 int i = 0;
149 struct ltt_kernel_channel *kchan;
150
151 DBG("Listing channels for session %s", session->name);
152
153 switch (domain) {
154 case LTTNG_DOMAIN_KERNEL:
155 /* Kernel channels */
156 if (session->kernel_session != NULL) {
157 cds_list_for_each_entry(kchan,
158 &session->kernel_session->channel_list.head, list) {
159 /* Copy lttng_channel struct to array */
160 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
161 channels[i].enabled = kchan->enabled;
162 i++;
163 }
164 }
165 break;
166 case LTTNG_DOMAIN_UST:
167 {
168 struct lttng_ht_iter iter;
169 struct ltt_ust_channel *uchan;
170
e7fe706f 171 rcu_read_lock();
2f77fc4b
DG
172 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
173 &iter.iter, uchan, node.node) {
174 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
175 channels[i].attr.overwrite = uchan->attr.overwrite;
176 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
177 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
178 channels[i].attr.switch_timer_interval =
179 uchan->attr.switch_timer_interval;
180 channels[i].attr.read_timer_interval =
181 uchan->attr.read_timer_interval;
182 channels[i].enabled = uchan->enabled;
2f785fe7
DG
183 channels[i].attr.tracefile_size = uchan->tracefile_size;
184 channels[i].attr.tracefile_count = uchan->tracefile_count;
2f77fc4b
DG
185 switch (uchan->attr.output) {
186 case LTTNG_UST_MMAP:
187 default:
188 channels[i].attr.output = LTTNG_EVENT_MMAP;
189 break;
190 }
191 i++;
192 }
e7fe706f 193 rcu_read_unlock();
2f77fc4b
DG
194 break;
195 }
196 default:
197 break;
198 }
199}
200
3c6a091f 201/*
022d91ba 202 * Create a list of agent domain events.
3c6a091f
DG
203 *
204 * Return number of events in list on success or else a negative value.
205 */
022d91ba 206static int list_lttng_agent_events(struct agent *agt,
3c6a091f
DG
207 struct lttng_event **events)
208{
209 int i = 0, ret = 0;
210 unsigned int nb_event = 0;
022d91ba 211 struct agent_event *event;
3c6a091f
DG
212 struct lttng_event *tmp_events;
213 struct lttng_ht_iter iter;
214
022d91ba 215 assert(agt);
3c6a091f
DG
216 assert(events);
217
022d91ba 218 DBG3("Listing agent events");
3c6a091f 219
e5bbf678 220 rcu_read_lock();
022d91ba 221 nb_event = lttng_ht_get_count(agt->events);
e5bbf678 222 rcu_read_unlock();
3c6a091f
DG
223 if (nb_event == 0) {
224 ret = nb_event;
225 goto error;
226 }
227
228 tmp_events = zmalloc(nb_event * sizeof(*tmp_events));
229 if (!tmp_events) {
022d91ba 230 PERROR("zmalloc agent events session");
3c6a091f
DG
231 ret = -LTTNG_ERR_FATAL;
232 goto error;
233 }
234
235 rcu_read_lock();
022d91ba 236 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
3c6a091f
DG
237 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
238 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
239 tmp_events[i].enabled = event->enabled;
2106efa0 240 tmp_events[i].loglevel = event->loglevel_value;
ff94328f 241 tmp_events[i].loglevel_type = event->loglevel_type;
3c6a091f
DG
242 i++;
243 }
244 rcu_read_unlock();
245
246 *events = tmp_events;
247 ret = nb_event;
248
249error:
250 assert(nb_event == i);
251 return ret;
252}
253
2f77fc4b
DG
254/*
255 * Create a list of ust global domain events.
256 */
257static int list_lttng_ust_global_events(char *channel_name,
258 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
259{
260 int i = 0, ret = 0;
261 unsigned int nb_event = 0;
262 struct lttng_ht_iter iter;
263 struct lttng_ht_node_str *node;
264 struct ltt_ust_channel *uchan;
265 struct ltt_ust_event *uevent;
266 struct lttng_event *tmp;
267
268 DBG("Listing UST global events for channel %s", channel_name);
269
270 rcu_read_lock();
271
272 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
273 node = lttng_ht_iter_get_node_str(&iter);
274 if (node == NULL) {
f73fabfd 275 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
276 goto error;
277 }
278
279 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
280
3c442be3 281 nb_event = lttng_ht_get_count(uchan->events);
2f77fc4b
DG
282 if (nb_event == 0) {
283 ret = nb_event;
284 goto error;
285 }
286
287 DBG3("Listing UST global %d events", nb_event);
288
289 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
290 if (tmp == NULL) {
f73fabfd 291 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
292 goto error;
293 }
294
295 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
3c442be3
JG
296 if (uevent->internal) {
297 /* This event should remain hidden from clients */
298 nb_event--;
299 continue;
300 }
2f77fc4b
DG
301 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
302 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
303 tmp[i].enabled = uevent->enabled;
304
305 switch (uevent->attr.instrumentation) {
306 case LTTNG_UST_TRACEPOINT:
307 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
308 break;
309 case LTTNG_UST_PROBE:
310 tmp[i].type = LTTNG_EVENT_PROBE;
311 break;
312 case LTTNG_UST_FUNCTION:
313 tmp[i].type = LTTNG_EVENT_FUNCTION;
314 break;
315 }
316
317 tmp[i].loglevel = uevent->attr.loglevel;
318 switch (uevent->attr.loglevel_type) {
319 case LTTNG_UST_LOGLEVEL_ALL:
320 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
321 break;
322 case LTTNG_UST_LOGLEVEL_RANGE:
323 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
324 break;
325 case LTTNG_UST_LOGLEVEL_SINGLE:
326 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
327 break;
328 }
329 if (uevent->filter) {
330 tmp[i].filter = 1;
331 }
4634f12e
JI
332 if (uevent->exclusion) {
333 tmp[i].exclusion = 1;
334 }
2f77fc4b
DG
335 i++;
336 }
337
338 ret = nb_event;
339 *events = tmp;
340
341error:
342 rcu_read_unlock();
343 return ret;
344}
345
346/*
347 * Fill lttng_event array of all kernel events in the channel.
348 */
349static int list_lttng_kernel_events(char *channel_name,
350 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
351{
352 int i = 0, ret;
353 unsigned int nb_event;
354 struct ltt_kernel_event *event;
355 struct ltt_kernel_channel *kchan;
356
357 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
358 if (kchan == NULL) {
f73fabfd 359 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG
360 goto error;
361 }
362
363 nb_event = kchan->event_count;
364
365 DBG("Listing events for channel %s", kchan->channel->name);
366
367 if (nb_event == 0) {
834978fd
DG
368 *events = NULL;
369 goto syscall;
2f77fc4b
DG
370 }
371
372 *events = zmalloc(nb_event * sizeof(struct lttng_event));
373 if (*events == NULL) {
f73fabfd 374 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
375 goto error;
376 }
377
378 /* Kernel channels */
379 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
380 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
381 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
382 (*events)[i].enabled = event->enabled;
00f992f2
JG
383 (*events)[i].filter =
384 (unsigned char) !!event->filter_expression;
2f77fc4b
DG
385
386 switch (event->event->instrumentation) {
387 case LTTNG_KERNEL_TRACEPOINT:
388 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
389 break;
2f77fc4b 390 case LTTNG_KERNEL_KRETPROBE:
1896972b
DG
391 (*events)[i].type = LTTNG_EVENT_FUNCTION;
392 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
393 sizeof(struct lttng_kernel_kprobe));
394 break;
395 case LTTNG_KERNEL_KPROBE:
2f77fc4b
DG
396 (*events)[i].type = LTTNG_EVENT_PROBE;
397 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
398 sizeof(struct lttng_kernel_kprobe));
399 break;
400 case LTTNG_KERNEL_FUNCTION:
401 (*events)[i].type = LTTNG_EVENT_FUNCTION;
402 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
403 sizeof(struct lttng_kernel_function));
404 break;
405 case LTTNG_KERNEL_NOOP:
406 (*events)[i].type = LTTNG_EVENT_NOOP;
407 break;
408 case LTTNG_KERNEL_SYSCALL:
409 (*events)[i].type = LTTNG_EVENT_SYSCALL;
410 break;
411 case LTTNG_KERNEL_ALL:
412 assert(0);
413 break;
414 }
415 i++;
416 }
417
834978fd
DG
418syscall:
419 if (syscall_table) {
420 ssize_t new_size;
421
422 new_size = syscall_list_channel(kchan, events, nb_event);
423 if (new_size < 0) {
424 free(events);
425 ret = -new_size;
426 goto error;
427 }
428 nb_event = new_size;
429 }
430
2f77fc4b
DG
431 return nb_event;
432
433error:
f73fabfd
DG
434 /* Negate the error code to differentiate the size from an error */
435 return -ret;
2f77fc4b
DG
436}
437
438/*
439 * Add URI so the consumer output object. Set the correct path depending on the
440 * domain adding the default trace directory.
441 */
442static int add_uri_to_consumer(struct consumer_output *consumer,
56a37563
JG
443 struct lttng_uri *uri, enum lttng_domain_type domain,
444 const char *session_name)
2f77fc4b 445{
f73fabfd 446 int ret = LTTNG_OK;
2f77fc4b
DG
447 const char *default_trace_dir;
448
449 assert(uri);
450
451 if (consumer == NULL) {
452 DBG("No consumer detected. Don't add URI. Stopping.");
f73fabfd 453 ret = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
454 goto error;
455 }
456
457 switch (domain) {
458 case LTTNG_DOMAIN_KERNEL:
459 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
460 break;
461 case LTTNG_DOMAIN_UST:
462 default_trace_dir = DEFAULT_UST_TRACE_DIR;
463 break;
464 default:
465 /*
466 * This case is possible is we try to add the URI to the global tracing
467 * session consumer object which in this case there is no subdir.
468 */
469 default_trace_dir = "";
470 }
471
472 switch (uri->dtype) {
473 case LTTNG_DST_IPV4:
474 case LTTNG_DST_IPV6:
475 DBG2("Setting network URI to consumer");
476
df75acac
DG
477 if (consumer->type == CONSUMER_DST_NET) {
478 if ((uri->stype == LTTNG_STREAM_CONTROL &&
785d2d0d
DG
479 consumer->dst.net.control_isset) ||
480 (uri->stype == LTTNG_STREAM_DATA &&
481 consumer->dst.net.data_isset)) {
df75acac
DG
482 ret = LTTNG_ERR_URL_EXIST;
483 goto error;
484 }
485 } else {
486 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
785d2d0d
DG
487 }
488
df75acac
DG
489 consumer->type = CONSUMER_DST_NET;
490
2f77fc4b
DG
491 /* Set URI into consumer output object */
492 ret = consumer_set_network_uri(consumer, uri);
493 if (ret < 0) {
a74934ba 494 ret = -ret;
2f77fc4b
DG
495 goto error;
496 } else if (ret == 1) {
497 /*
498 * URI was the same in the consumer so we do not append the subdir
499 * again so to not duplicate output dir.
500 */
f86c9f4e 501 ret = LTTNG_OK;
2f77fc4b
DG
502 goto error;
503 }
504
505 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
506 ret = consumer_set_subdir(consumer, session_name);
507 if (ret < 0) {
f73fabfd 508 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
509 goto error;
510 }
511 }
512
513 if (uri->stype == LTTNG_STREAM_CONTROL) {
514 /* On a new subdir, reappend the default trace dir. */
c30ce0b3
CB
515 strncat(consumer->subdir, default_trace_dir,
516 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2f77fc4b
DG
517 DBG3("Append domain trace name to subdir %s", consumer->subdir);
518 }
519
520 break;
521 case LTTNG_DST_PATH:
522 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
523 memset(consumer->dst.trace_path, 0,
524 sizeof(consumer->dst.trace_path));
525 strncpy(consumer->dst.trace_path, uri->dst.path,
526 sizeof(consumer->dst.trace_path));
527 /* Append default trace dir */
528 strncat(consumer->dst.trace_path, default_trace_dir,
c30ce0b3
CB
529 sizeof(consumer->dst.trace_path) -
530 strlen(consumer->dst.trace_path) - 1);
2f77fc4b
DG
531 /* Flag consumer as local. */
532 consumer->type = CONSUMER_DST_LOCAL;
533 break;
534 }
535
a74934ba
DG
536 ret = LTTNG_OK;
537
2f77fc4b
DG
538error:
539 return ret;
540}
541
542/*
543 * Init tracing by creating trace directory and sending fds kernel consumer.
544 */
545static int init_kernel_tracing(struct ltt_kernel_session *session)
546{
547 int ret = 0;
548 struct lttng_ht_iter iter;
549 struct consumer_socket *socket;
550
551 assert(session);
552
e7fe706f
DG
553 rcu_read_lock();
554
2f77fc4b
DG
555 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
556 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
557 socket, node.node) {
2f77fc4b 558 pthread_mutex_lock(socket->lock);
f50f23d9 559 ret = kernel_consumer_send_session(socket, session);
2f77fc4b
DG
560 pthread_mutex_unlock(socket->lock);
561 if (ret < 0) {
f73fabfd 562 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
563 goto error;
564 }
565 }
566 }
567
568error:
e7fe706f 569 rcu_read_unlock();
2f77fc4b
DG
570 return ret;
571}
572
573/*
574 * Create a socket to the relayd using the URI.
575 *
576 * On success, the relayd_sock pointer is set to the created socket.
577 * Else, it's stays untouched and a lttcomm error code is returned.
578 */
6151a90f
JD
579static int create_connect_relayd(struct lttng_uri *uri,
580 struct lttcomm_relayd_sock **relayd_sock)
2f77fc4b
DG
581{
582 int ret;
6151a90f 583 struct lttcomm_relayd_sock *rsock;
2f77fc4b 584
6151a90f
JD
585 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
586 RELAYD_VERSION_COMM_MINOR);
587 if (!rsock) {
f73fabfd 588 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
589 goto error;
590 }
591
ffe60014
DG
592 /*
593 * Connect to relayd so we can proceed with a session creation. This call
594 * can possibly block for an arbitrary amount of time to set the health
595 * state to be in poll execution.
596 */
597 health_poll_entry();
6151a90f 598 ret = relayd_connect(rsock);
ffe60014 599 health_poll_exit();
2f77fc4b
DG
600 if (ret < 0) {
601 ERR("Unable to reach lttng-relayd");
f73fabfd 602 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG
603 goto free_sock;
604 }
605
606 /* Create socket for control stream. */
607 if (uri->stype == LTTNG_STREAM_CONTROL) {
608 DBG3("Creating relayd stream socket from URI");
609
610 /* Check relayd version */
6151a90f 611 ret = relayd_version_check(rsock);
2f77fc4b 612 if (ret < 0) {
f73fabfd 613 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
2f77fc4b
DG
614 goto close_sock;
615 }
616 } else if (uri->stype == LTTNG_STREAM_DATA) {
617 DBG3("Creating relayd data socket from URI");
618 } else {
619 /* Command is not valid */
620 ERR("Relayd invalid stream type: %d", uri->stype);
f73fabfd 621 ret = LTTNG_ERR_INVALID;
2f77fc4b
DG
622 goto close_sock;
623 }
624
6151a90f 625 *relayd_sock = rsock;
2f77fc4b 626
f73fabfd 627 return LTTNG_OK;
2f77fc4b
DG
628
629close_sock:
6151a90f
JD
630 /* The returned value is not useful since we are on an error path. */
631 (void) relayd_close(rsock);
2f77fc4b 632free_sock:
6151a90f 633 free(rsock);
2f77fc4b
DG
634error:
635 return ret;
636}
637
638/*
639 * Connect to the relayd using URI and send the socket to the right consumer.
640 */
56a37563
JG
641static int send_consumer_relayd_socket(enum lttng_domain_type domain,
642 unsigned int session_id, struct lttng_uri *relayd_uri,
643 struct consumer_output *consumer,
d3e2ba59
JD
644 struct consumer_socket *consumer_sock,
645 char *session_name, char *hostname, int session_live_timer)
2f77fc4b
DG
646{
647 int ret;
6151a90f 648 struct lttcomm_relayd_sock *rsock = NULL;
2f77fc4b 649
ffe60014 650 /* Connect to relayd and make version check if uri is the control. */
6151a90f 651 ret = create_connect_relayd(relayd_uri, &rsock);
ffe60014 652 if (ret != LTTNG_OK) {
6151a90f 653 goto error;
ffe60014 654 }
6151a90f 655 assert(rsock);
ffe60014 656
2f77fc4b 657 /* Set the network sequence index if not set. */
d88aee68
DG
658 if (consumer->net_seq_index == (uint64_t) -1ULL) {
659 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
660 /*
661 * Increment net_seq_idx because we are about to transfer the
662 * new relayd socket to the consumer.
d88aee68 663 * Assign unique key so the consumer can match streams.
2f77fc4b 664 */
d88aee68
DG
665 consumer->net_seq_index = ++relayd_net_seq_idx;
666 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
667 }
668
2f77fc4b 669 /* Send relayd socket to consumer. */
6151a90f 670 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
d3e2ba59
JD
671 relayd_uri->stype, session_id,
672 session_name, hostname, session_live_timer);
2f77fc4b 673 if (ret < 0) {
f73fabfd 674 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
675 goto close_sock;
676 }
677
c890b720
DG
678 /* Flag that the corresponding socket was sent. */
679 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
ffe60014 680 consumer_sock->control_sock_sent = 1;
c890b720 681 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
ffe60014 682 consumer_sock->data_sock_sent = 1;
c890b720
DG
683 }
684
f73fabfd 685 ret = LTTNG_OK;
2f77fc4b
DG
686
687 /*
688 * Close socket which was dup on the consumer side. The session daemon does
689 * NOT keep track of the relayd socket(s) once transfer to the consumer.
690 */
691
692close_sock:
6151a90f
JD
693 (void) relayd_close(rsock);
694 free(rsock);
2f77fc4b 695
6151a90f 696error:
ffe60014
DG
697 if (ret != LTTNG_OK) {
698 /*
d9078d0c
DG
699 * The consumer output for this session should not be used anymore
700 * since the relayd connection failed thus making any tracing or/and
701 * streaming not usable.
ffe60014 702 */
d9078d0c 703 consumer->enabled = 0;
ffe60014 704 }
2f77fc4b
DG
705 return ret;
706}
707
708/*
709 * Send both relayd sockets to a specific consumer and domain. This is a
710 * helper function to facilitate sending the information to the consumer for a
711 * session.
712 */
56a37563
JG
713static int send_consumer_relayd_sockets(enum lttng_domain_type domain,
714 unsigned int session_id, struct consumer_output *consumer,
715 struct consumer_socket *sock, char *session_name,
716 char *hostname, int session_live_timer)
2f77fc4b 717{
dda67f6c 718 int ret = LTTNG_OK;
2f77fc4b 719
2f77fc4b 720 assert(consumer);
6dc3064a 721 assert(sock);
2f77fc4b 722
2f77fc4b 723 /* Sending control relayd socket. */
ffe60014 724 if (!sock->control_sock_sent) {
6dc3064a 725 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD
726 &consumer->dst.net.control, consumer, sock,
727 session_name, hostname, session_live_timer);
c890b720
DG
728 if (ret != LTTNG_OK) {
729 goto error;
730 }
2f77fc4b
DG
731 }
732
733 /* Sending data relayd socket. */
ffe60014 734 if (!sock->data_sock_sent) {
6dc3064a 735 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD
736 &consumer->dst.net.data, consumer, sock,
737 session_name, hostname, session_live_timer);
c890b720
DG
738 if (ret != LTTNG_OK) {
739 goto error;
740 }
2f77fc4b
DG
741 }
742
2f77fc4b
DG
743error:
744 return ret;
745}
746
747/*
748 * Setup relayd connections for a tracing session. First creates the socket to
749 * the relayd and send them to the right domain consumer. Consumer type MUST be
750 * network.
751 */
ffe60014 752int cmd_setup_relayd(struct ltt_session *session)
2f77fc4b 753{
f73fabfd 754 int ret = LTTNG_OK;
2f77fc4b
DG
755 struct ltt_ust_session *usess;
756 struct ltt_kernel_session *ksess;
757 struct consumer_socket *socket;
758 struct lttng_ht_iter iter;
759
760 assert(session);
761
762 usess = session->ust_session;
763 ksess = session->kernel_session;
764
785d2d0d 765 DBG("Setting relayd for session %s", session->name);
2f77fc4b 766
e7fe706f
DG
767 rcu_read_lock();
768
2f77fc4b
DG
769 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
770 && usess->consumer->enabled) {
771 /* For each consumer socket, send relayd sockets */
772 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
773 socket, node.node) {
2f77fc4b 774 pthread_mutex_lock(socket->lock);
6dc3064a 775 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
d3e2ba59
JD
776 usess->consumer, socket,
777 session->name, session->hostname,
778 session->live_timer);
2f77fc4b 779 pthread_mutex_unlock(socket->lock);
f73fabfd 780 if (ret != LTTNG_OK) {
2f77fc4b
DG
781 goto error;
782 }
6dc3064a
DG
783 /* Session is now ready for network streaming. */
784 session->net_handle = 1;
2f77fc4b
DG
785 }
786 }
787
788 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
789 && ksess->consumer->enabled) {
790 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
791 socket, node.node) {
2f77fc4b 792 pthread_mutex_lock(socket->lock);
6dc3064a 793 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
d3e2ba59
JD
794 ksess->consumer, socket,
795 session->name, session->hostname,
796 session->live_timer);
2f77fc4b 797 pthread_mutex_unlock(socket->lock);
f73fabfd 798 if (ret != LTTNG_OK) {
2f77fc4b
DG
799 goto error;
800 }
6dc3064a
DG
801 /* Session is now ready for network streaming. */
802 session->net_handle = 1;
2f77fc4b
DG
803 }
804 }
805
806error:
e7fe706f 807 rcu_read_unlock();
2f77fc4b
DG
808 return ret;
809}
810
9b6c7ec5
DG
811/*
812 * Start a kernel session by opening all necessary streams.
813 */
814static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
815{
816 int ret;
817 struct ltt_kernel_channel *kchan;
818
819 /* Open kernel metadata */
07b86b52 820 if (ksess->metadata == NULL && ksess->output_traces) {
9b6c7ec5
DG
821 ret = kernel_open_metadata(ksess);
822 if (ret < 0) {
823 ret = LTTNG_ERR_KERN_META_FAIL;
824 goto error;
825 }
826 }
827
828 /* Open kernel metadata stream */
07b86b52 829 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
9b6c7ec5
DG
830 ret = kernel_open_metadata_stream(ksess);
831 if (ret < 0) {
832 ERR("Kernel create metadata stream failed");
833 ret = LTTNG_ERR_KERN_STREAM_FAIL;
834 goto error;
835 }
836 }
837
838 /* For each channel */
839 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
840 if (kchan->stream_count == 0) {
841 ret = kernel_open_channel_stream(kchan);
842 if (ret < 0) {
843 ret = LTTNG_ERR_KERN_STREAM_FAIL;
844 goto error;
845 }
846 /* Update the stream global counter */
847 ksess->stream_count_global += ret;
848 }
849 }
850
851 /* Setup kernel consumer socket and send fds to it */
852 ret = init_kernel_tracing(ksess);
e43c41c5 853 if (ret != 0) {
9b6c7ec5
DG
854 ret = LTTNG_ERR_KERN_START_FAIL;
855 goto error;
856 }
857
858 /* This start the kernel tracing */
859 ret = kernel_start_session(ksess);
860 if (ret < 0) {
861 ret = LTTNG_ERR_KERN_START_FAIL;
862 goto error;
863 }
864
865 /* Quiescent wait after starting trace */
784303b0 866 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5 867
14fb1ebe 868 ksess->active = 1;
9b6c7ec5
DG
869
870 ret = LTTNG_OK;
871
872error:
873 return ret;
874}
875
2f77fc4b
DG
876/*
877 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
878 */
56a37563
JG
879int cmd_disable_channel(struct ltt_session *session,
880 enum lttng_domain_type domain, char *channel_name)
2f77fc4b
DG
881{
882 int ret;
883 struct ltt_ust_session *usess;
884
885 usess = session->ust_session;
886
2223c96f
DG
887 rcu_read_lock();
888
2f77fc4b
DG
889 switch (domain) {
890 case LTTNG_DOMAIN_KERNEL:
891 {
892 ret = channel_kernel_disable(session->kernel_session,
893 channel_name);
f73fabfd 894 if (ret != LTTNG_OK) {
2f77fc4b
DG
895 goto error;
896 }
897
898 kernel_wait_quiescent(kernel_tracer_fd);
899 break;
900 }
901 case LTTNG_DOMAIN_UST:
902 {
903 struct ltt_ust_channel *uchan;
904 struct lttng_ht *chan_ht;
905
906 chan_ht = usess->domain_global.channels;
907
908 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
909 if (uchan == NULL) {
f73fabfd 910 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
911 goto error;
912 }
913
7972aab2 914 ret = channel_ust_disable(usess, uchan);
f73fabfd 915 if (ret != LTTNG_OK) {
2f77fc4b
DG
916 goto error;
917 }
918 break;
919 }
2f77fc4b 920 default:
f73fabfd 921 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
922 goto error;
923 }
924
f73fabfd 925 ret = LTTNG_OK;
2f77fc4b
DG
926
927error:
2223c96f 928 rcu_read_unlock();
2f77fc4b
DG
929 return ret;
930}
931
ccf10263
MD
932/*
933 * Command LTTNG_TRACK_PID processed by the client thread.
a9ad0c8f
MD
934 *
935 * Called with session lock held.
ccf10263 936 */
56a37563
JG
937int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain,
938 int pid)
ccf10263
MD
939{
940 int ret;
941
942 rcu_read_lock();
943
944 switch (domain) {
945 case LTTNG_DOMAIN_KERNEL:
946 {
947 struct ltt_kernel_session *ksess;
948
949 ksess = session->kernel_session;
950
951 ret = kernel_track_pid(ksess, pid);
952 if (ret != LTTNG_OK) {
953 goto error;
954 }
955
956 kernel_wait_quiescent(kernel_tracer_fd);
957 break;
958 }
ccf10263 959 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
960 {
961 struct ltt_ust_session *usess;
962
963 usess = session->ust_session;
964
965 ret = trace_ust_track_pid(usess, pid);
966 if (ret != LTTNG_OK) {
967 goto error;
968 }
969 break;
970 }
ccf10263
MD
971 default:
972 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
973 goto error;
974 }
975
976 ret = LTTNG_OK;
977
978error:
979 rcu_read_unlock();
980 return ret;
981}
982
983/*
984 * Command LTTNG_UNTRACK_PID processed by the client thread.
a9ad0c8f
MD
985 *
986 * Called with session lock held.
ccf10263 987 */
56a37563
JG
988int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain,
989 int pid)
ccf10263
MD
990{
991 int ret;
992
993 rcu_read_lock();
994
995 switch (domain) {
996 case LTTNG_DOMAIN_KERNEL:
997 {
998 struct ltt_kernel_session *ksess;
999
1000 ksess = session->kernel_session;
1001
1002 ret = kernel_untrack_pid(ksess, pid);
1003 if (ret != LTTNG_OK) {
1004 goto error;
1005 }
1006
1007 kernel_wait_quiescent(kernel_tracer_fd);
1008 break;
1009 }
ccf10263 1010 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
1011 {
1012 struct ltt_ust_session *usess;
1013
1014 usess = session->ust_session;
1015
1016 ret = trace_ust_untrack_pid(usess, pid);
1017 if (ret != LTTNG_OK) {
1018 goto error;
1019 }
1020 break;
1021 }
ccf10263
MD
1022 default:
1023 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1024 goto error;
1025 }
1026
1027 ret = LTTNG_OK;
1028
1029error:
1030 rcu_read_unlock();
1031 return ret;
1032}
1033
2f77fc4b
DG
1034/*
1035 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1036 *
1037 * The wpipe arguments is used as a notifier for the kernel thread.
1038 */
1039int cmd_enable_channel(struct ltt_session *session,
7972aab2 1040 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
2f77fc4b
DG
1041{
1042 int ret;
1043 struct ltt_ust_session *usess = session->ust_session;
1044 struct lttng_ht *chan_ht;
1f345e94 1045 size_t len;
2f77fc4b
DG
1046
1047 assert(session);
1048 assert(attr);
7972aab2 1049 assert(domain);
2f77fc4b 1050
1f345e94
PP
1051 len = strnlen(attr->name, sizeof(attr->name));
1052
1053 /* Validate channel name */
1054 if (attr->name[0] == '.' ||
1055 memchr(attr->name, '/', len) != NULL) {
1056 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1057 goto end;
1058 }
1059
2f77fc4b
DG
1060 DBG("Enabling channel %s for session %s", attr->name, session->name);
1061
03b4fdcf
DG
1062 rcu_read_lock();
1063
ecc48a90
JD
1064 /*
1065 * Don't try to enable a channel if the session has been started at
1066 * some point in time before. The tracer does not allow it.
1067 */
8382cf6f 1068 if (session->has_been_started) {
ecc48a90
JD
1069 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1070 goto error;
1071 }
1072
1073 /*
1074 * If the session is a live session, remove the switch timer, the
1075 * live timer does the same thing but sends also synchronisation
1076 * beacons for inactive streams.
1077 */
1078 if (session->live_timer > 0) {
1079 attr->attr.live_timer_interval = session->live_timer;
1080 attr->attr.switch_timer_interval = 0;
1081 }
1082
33fbd469
DG
1083 /*
1084 * The ringbuffer (both in user space and kernel) behave badly in overwrite
1085 * mode and with less than 2 subbuf so block it right away and send back an
1086 * invalid attribute error.
1087 */
1088 if (attr->attr.overwrite && attr->attr.num_subbuf < 2) {
1089 ret = LTTNG_ERR_INVALID;
1090 goto error;
1091 }
1092
7972aab2 1093 switch (domain->type) {
2f77fc4b
DG
1094 case LTTNG_DOMAIN_KERNEL:
1095 {
1096 struct ltt_kernel_channel *kchan;
1097
2f77fc4b
DG
1098 kchan = trace_kernel_get_channel_by_name(attr->name,
1099 session->kernel_session);
1100 if (kchan == NULL) {
1101 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
85076754
MD
1102 if (attr->name[0] != '\0') {
1103 session->kernel_session->has_non_default_channel = 1;
1104 }
2f77fc4b
DG
1105 } else {
1106 ret = channel_kernel_enable(session->kernel_session, kchan);
1107 }
1108
f73fabfd 1109 if (ret != LTTNG_OK) {
2f77fc4b
DG
1110 goto error;
1111 }
1112
784303b0 1113 kernel_wait_quiescent(kernel_tracer_fd);
2f77fc4b
DG
1114 break;
1115 }
1116 case LTTNG_DOMAIN_UST:
9232818f
JG
1117 case LTTNG_DOMAIN_JUL:
1118 case LTTNG_DOMAIN_LOG4J:
1119 case LTTNG_DOMAIN_PYTHON:
2f77fc4b
DG
1120 {
1121 struct ltt_ust_channel *uchan;
1122
9232818f
JG
1123 /*
1124 * FIXME
1125 *
1126 * Current agent implementation limitations force us to allow
1127 * only one channel at once in "agent" subdomains. Each
1128 * subdomain has a default channel name which must be strictly
1129 * adhered to.
1130 */
1131 if (domain->type == LTTNG_DOMAIN_JUL) {
1132 if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME,
1133 LTTNG_SYMBOL_NAME_LEN)) {
1134 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1135 goto error;
1136 }
1137 } else if (domain->type == LTTNG_DOMAIN_LOG4J) {
1138 if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME,
1139 LTTNG_SYMBOL_NAME_LEN)) {
1140 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1141 goto error;
1142 }
1143 } else if (domain->type == LTTNG_DOMAIN_PYTHON) {
1144 if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME,
1145 LTTNG_SYMBOL_NAME_LEN)) {
1146 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1147 goto error;
1148 }
1149 }
1150
2f77fc4b
DG
1151 chan_ht = usess->domain_global.channels;
1152
1153 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1154 if (uchan == NULL) {
7972aab2 1155 ret = channel_ust_create(usess, attr, domain->buf_type);
85076754
MD
1156 if (attr->name[0] != '\0') {
1157 usess->has_non_default_channel = 1;
1158 }
2f77fc4b 1159 } else {
7972aab2 1160 ret = channel_ust_enable(usess, uchan);
2f77fc4b
DG
1161 }
1162 break;
1163 }
2f77fc4b 1164 default:
f73fabfd 1165 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1166 goto error;
1167 }
1168
1169error:
2223c96f 1170 rcu_read_unlock();
1f345e94 1171end:
2f77fc4b
DG
1172 return ret;
1173}
1174
2f77fc4b
DG
1175/*
1176 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1177 */
56a37563
JG
1178int cmd_disable_event(struct ltt_session *session,
1179 enum lttng_domain_type domain, char *channel_name,
6e911cad 1180 struct lttng_event *event)
2f77fc4b
DG
1181{
1182 int ret;
6e911cad
MD
1183 char *event_name;
1184
18a720cd
MD
1185 DBG("Disable event command for event \'%s\'", event->name);
1186
6e911cad 1187 event_name = event->name;
7076b56e
JG
1188 if (validate_event_name(event_name)) {
1189 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1190 goto error;
1191 }
6e911cad 1192
9b7431cf
JG
1193 /* Error out on unhandled search criteria */
1194 if (event->loglevel_type || event->loglevel != -1 || event->enabled
6e911cad 1195 || event->pid || event->filter || event->exclusion) {
7076b56e
JG
1196 ret = LTTNG_ERR_UNK;
1197 goto error;
6e911cad 1198 }
2f77fc4b 1199
2223c96f
DG
1200 rcu_read_lock();
1201
2f77fc4b
DG
1202 switch (domain) {
1203 case LTTNG_DOMAIN_KERNEL:
1204 {
1205 struct ltt_kernel_channel *kchan;
1206 struct ltt_kernel_session *ksess;
1207
1208 ksess = session->kernel_session;
1209
85076754
MD
1210 /*
1211 * If a non-default channel has been created in the
1212 * session, explicitely require that -c chan_name needs
1213 * to be provided.
1214 */
1215 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1216 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1217 goto error_unlock;
85076754
MD
1218 }
1219
2f77fc4b
DG
1220 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1221 if (kchan == NULL) {
f73fabfd 1222 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
7076b56e 1223 goto error_unlock;
2f77fc4b
DG
1224 }
1225
6e911cad
MD
1226 switch (event->type) {
1227 case LTTNG_EVENT_ALL:
d0ae4ea8 1228 ret = event_kernel_disable_event_all(kchan);
29c62722 1229 if (ret != LTTNG_OK) {
7076b56e 1230 goto error_unlock;
29c62722
MD
1231 }
1232 break;
d0ae4ea8
MD
1233 case LTTNG_EVENT_TRACEPOINT: /* fall-through */
1234 case LTTNG_EVENT_SYSCALL:
29c62722 1235 if (!strcmp(event_name, "*")) {
d0ae4ea8
MD
1236 ret = event_kernel_disable_event_type(kchan,
1237 event->type);
29c62722 1238 } else {
d0ae4ea8
MD
1239 ret = event_kernel_disable_event(kchan,
1240 event_name);
29c62722 1241 }
6e911cad 1242 if (ret != LTTNG_OK) {
7076b56e 1243 goto error_unlock;
6e911cad
MD
1244 }
1245 break;
d0ae4ea8
MD
1246 case LTTNG_EVENT_PROBE:
1247 case LTTNG_EVENT_FUNCTION:
1248 case LTTNG_EVENT_FUNCTION_ENTRY:
1249 ret = event_kernel_disable_event(kchan, event_name);
e2b957af 1250 if (ret != LTTNG_OK) {
7076b56e 1251 goto error_unlock;
e2b957af 1252 }
6e911cad
MD
1253 break;
1254 default:
1255 ret = LTTNG_ERR_UNK;
7076b56e 1256 goto error_unlock;
2f77fc4b
DG
1257 }
1258
1259 kernel_wait_quiescent(kernel_tracer_fd);
1260 break;
1261 }
1262 case LTTNG_DOMAIN_UST:
1263 {
1264 struct ltt_ust_channel *uchan;
1265 struct ltt_ust_session *usess;
1266
1267 usess = session->ust_session;
1268
7076b56e
JG
1269 if (validate_ust_event_name(event_name)) {
1270 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1271 goto error_unlock;
1272 }
1273
85076754
MD
1274 /*
1275 * If a non-default channel has been created in the
1276 * session, explicitely require that -c chan_name needs
1277 * to be provided.
1278 */
1279 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1280 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1281 goto error_unlock;
85076754
MD
1282 }
1283
2f77fc4b
DG
1284 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1285 channel_name);
1286 if (uchan == NULL) {
f73fabfd 1287 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
7076b56e 1288 goto error_unlock;
2f77fc4b
DG
1289 }
1290
6e911cad
MD
1291 switch (event->type) {
1292 case LTTNG_EVENT_ALL:
77d536b2
JR
1293 if (strlen(event->name) == 1 &&
1294 !strncmp(event->name, "*", 1)) {
1295 ret = event_ust_disable_all_tracepoints(usess,
1296 uchan);
1297 } else {
1298 ret = event_ust_disable_tracepoint(usess, uchan,
1299 event_name);
1300 }
6e911cad 1301 if (ret != LTTNG_OK) {
7076b56e 1302 goto error_unlock;
6e911cad
MD
1303 }
1304 break;
1305 default:
1306 ret = LTTNG_ERR_UNK;
7076b56e 1307 goto error_unlock;
2f77fc4b
DG
1308 }
1309
1310 DBG3("Disable UST event %s in channel %s completed", event_name,
1311 channel_name);
1312 break;
1313 }
5cdb6027 1314 case LTTNG_DOMAIN_LOG4J:
f20baf8e 1315 case LTTNG_DOMAIN_JUL:
0e115563 1316 case LTTNG_DOMAIN_PYTHON:
f20baf8e 1317 {
fefd409b 1318 struct agent *agt;
f20baf8e
DG
1319 struct ltt_ust_session *usess = session->ust_session;
1320
1321 assert(usess);
1322
6e911cad
MD
1323 switch (event->type) {
1324 case LTTNG_EVENT_ALL:
1325 break;
1326 default:
1327 ret = LTTNG_ERR_UNK;
7076b56e 1328 goto error_unlock;
6e911cad
MD
1329 }
1330
5cdb6027 1331 agt = trace_ust_find_agent(usess, domain);
fefd409b
DG
1332 if (!agt) {
1333 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
7076b56e 1334 goto error_unlock;
fefd409b 1335 }
18a720cd
MD
1336 /* The wild card * means that everything should be disabled. */
1337 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1338 ret = event_agent_disable_all(usess, agt);
1339 } else {
1340 ret = event_agent_disable(usess, agt, event_name);
1341 }
f20baf8e 1342 if (ret != LTTNG_OK) {
7076b56e 1343 goto error_unlock;
f20baf8e
DG
1344 }
1345
1346 break;
1347 }
2f77fc4b 1348 default:
f73fabfd 1349 ret = LTTNG_ERR_UND;
7076b56e 1350 goto error_unlock;
2f77fc4b
DG
1351 }
1352
f73fabfd 1353 ret = LTTNG_OK;
2f77fc4b 1354
7076b56e 1355error_unlock:
2223c96f 1356 rcu_read_unlock();
7076b56e 1357error:
2f77fc4b
DG
1358 return ret;
1359}
1360
2f77fc4b
DG
1361/*
1362 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1363 */
56a37563 1364int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain,
601d5acf 1365 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
2f77fc4b 1366{
d5979e4a 1367 int ret, chan_kern_created = 0, chan_ust_created = 0;
2f77fc4b
DG
1368
1369 switch (domain) {
1370 case LTTNG_DOMAIN_KERNEL:
979e618e
DG
1371 assert(session->kernel_session);
1372
1373 if (session->kernel_session->channel_count == 0) {
1374 /* Create default channel */
1375 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1376 if (ret != LTTNG_OK) {
1377 goto error;
1378 }
d5979e4a 1379 chan_kern_created = 1;
979e618e 1380 }
2f77fc4b 1381 /* Add kernel context to kernel tracer */
601d5acf 1382 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
f73fabfd 1383 if (ret != LTTNG_OK) {
2f77fc4b
DG
1384 goto error;
1385 }
1386 break;
1387 case LTTNG_DOMAIN_UST:
1388 {
1389 struct ltt_ust_session *usess = session->ust_session;
85076754
MD
1390 unsigned int chan_count;
1391
2f77fc4b
DG
1392 assert(usess);
1393
85076754 1394 chan_count = lttng_ht_get_count(usess->domain_global.channels);
979e618e
DG
1395 if (chan_count == 0) {
1396 struct lttng_channel *attr;
1397 /* Create default channel */
0a9c6494 1398 attr = channel_new_default_attr(domain, usess->buffer_type);
979e618e
DG
1399 if (attr == NULL) {
1400 ret = LTTNG_ERR_FATAL;
1401 goto error;
1402 }
1403
7972aab2 1404 ret = channel_ust_create(usess, attr, usess->buffer_type);
979e618e
DG
1405 if (ret != LTTNG_OK) {
1406 free(attr);
1407 goto error;
1408 }
1409 free(attr);
d5979e4a 1410 chan_ust_created = 1;
979e618e
DG
1411 }
1412
601d5acf 1413 ret = context_ust_add(usess, domain, ctx, channel_name);
f73fabfd 1414 if (ret != LTTNG_OK) {
2f77fc4b
DG
1415 goto error;
1416 }
1417 break;
1418 }
2f77fc4b 1419 default:
f73fabfd 1420 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1421 goto error;
1422 }
1423
d5979e4a 1424 return LTTNG_OK;
2f77fc4b
DG
1425
1426error:
d5979e4a
DG
1427 if (chan_kern_created) {
1428 struct ltt_kernel_channel *kchan =
1429 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1430 session->kernel_session);
1431 /* Created previously, this should NOT fail. */
1432 assert(kchan);
1433 kernel_destroy_channel(kchan);
1434 }
1435
1436 if (chan_ust_created) {
1437 struct ltt_ust_channel *uchan =
1438 trace_ust_find_channel_by_name(
1439 session->ust_session->domain_global.channels,
1440 DEFAULT_CHANNEL_NAME);
1441 /* Created previously, this should NOT fail. */
1442 assert(uchan);
1443 /* Remove from the channel list of the session. */
1444 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1445 uchan);
1446 trace_ust_destroy_channel(uchan);
1447 }
2f77fc4b
DG
1448 return ret;
1449}
1450
930a2e99
JG
1451static int validate_event_name(const char *name)
1452{
1453 int ret = 0;
1454 const char *c = name;
1455 const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN;
bf9807db 1456 bool null_terminated = false;
930a2e99
JG
1457
1458 /*
1459 * Make sure that unescaped wildcards are only used as the last
1460 * character of the event name.
1461 */
1462 while (c < event_name_end) {
1463 switch (*c) {
1464 case '\0':
bf9807db 1465 null_terminated = true;
930a2e99
JG
1466 goto end;
1467 case '\\':
1468 c++;
1469 break;
1470 case '*':
1471 if ((c + 1) < event_name_end && *(c + 1)) {
1472 /* Wildcard is not the last character */
1473 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1474 goto end;
1475 }
1476 default:
1477 break;
1478 }
1479 c++;
1480 }
1481end:
bf9807db
JG
1482 if (!ret && !null_terminated) {
1483 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1484 }
930a2e99
JG
1485 return ret;
1486}
1487
dac8e046
JG
1488static inline bool name_starts_with(const char *name, const char *prefix)
1489{
1490 const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
1491
1492 return !strncmp(name, prefix, max_cmp_len);
1493}
1494
1495/* Perform userspace-specific event name validation */
1496static int validate_ust_event_name(const char *name)
1497{
1498 int ret = 0;
1499
1500 if (!name) {
1501 ret = -1;
1502 goto end;
1503 }
1504
1505 /*
1506 * Check name against all internal UST event component namespaces used
1507 * by the agents.
1508 */
1509 if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) ||
1510 name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) ||
1511 name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) {
1512 ret = -1;
1513 }
1514
1515end:
1516 return ret;
1517}
88f06f15 1518
2f77fc4b 1519/*
88f06f15
JG
1520 * Internal version of cmd_enable_event() with a supplemental
1521 * "internal_event" flag which is used to enable internal events which should
1522 * be hidden from clients. Such events are used in the agent implementation to
1523 * enable the events through which all "agent" events are funeled.
2f77fc4b 1524 */
88f06f15
JG
1525static int _cmd_enable_event(struct ltt_session *session,
1526 struct lttng_domain *domain,
025faf73 1527 char *channel_name, struct lttng_event *event,
6b453b5e 1528 char *filter_expression,
db8f1377
JI
1529 struct lttng_filter_bytecode *filter,
1530 struct lttng_event_exclusion *exclusion,
88f06f15 1531 int wpipe, bool internal_event)
2f77fc4b 1532{
e5f5db7f 1533 int ret, channel_created = 0;
2f77fc4b
DG
1534 struct lttng_channel *attr;
1535
1536 assert(session);
1537 assert(event);
1538 assert(channel_name);
1539
2a385866
JG
1540 /* If we have a filter, we must have its filter expression */
1541 assert(!(!!filter_expression ^ !!filter));
1542
18a720cd
MD
1543 DBG("Enable event command for event \'%s\'", event->name);
1544
f5ac4bd7
MD
1545 rcu_read_lock();
1546
930a2e99
JG
1547 ret = validate_event_name(event->name);
1548 if (ret) {
1549 goto error;
1550 }
1551
7972aab2 1552 switch (domain->type) {
2f77fc4b
DG
1553 case LTTNG_DOMAIN_KERNEL:
1554 {
1555 struct ltt_kernel_channel *kchan;
1556
85076754
MD
1557 /*
1558 * If a non-default channel has been created in the
1559 * session, explicitely require that -c chan_name needs
1560 * to be provided.
1561 */
1562 if (session->kernel_session->has_non_default_channel
1563 && channel_name[0] == '\0') {
1564 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1565 goto error;
1566 }
1567
2f77fc4b
DG
1568 kchan = trace_kernel_get_channel_by_name(channel_name,
1569 session->kernel_session);
1570 if (kchan == NULL) {
0a9c6494
DG
1571 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1572 LTTNG_BUFFER_GLOBAL);
2f77fc4b 1573 if (attr == NULL) {
f73fabfd 1574 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1575 goto error;
1576 }
1577 strncpy(attr->name, channel_name, sizeof(attr->name));
1578
1579 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1580 if (ret != LTTNG_OK) {
2f77fc4b
DG
1581 free(attr);
1582 goto error;
1583 }
1584 free(attr);
e5f5db7f
DG
1585
1586 channel_created = 1;
2f77fc4b
DG
1587 }
1588
1589 /* Get the newly created kernel channel pointer */
1590 kchan = trace_kernel_get_channel_by_name(channel_name,
1591 session->kernel_session);
1592 if (kchan == NULL) {
1593 /* This sould not happen... */
f73fabfd 1594 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1595 goto error;
1596 }
1597
6e911cad
MD
1598 switch (event->type) {
1599 case LTTNG_EVENT_ALL:
29c62722 1600 {
00a62084
MD
1601 char *filter_expression_a = NULL;
1602 struct lttng_filter_bytecode *filter_a = NULL;
1603
1604 /*
1605 * We need to duplicate filter_expression and filter,
1606 * because ownership is passed to first enable
1607 * event.
1608 */
1609 if (filter_expression) {
1610 filter_expression_a = strdup(filter_expression);
1611 if (!filter_expression_a) {
1612 ret = LTTNG_ERR_FATAL;
1613 goto error;
1614 }
1615 }
1616 if (filter) {
1617 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
1618 if (!filter_a) {
1619 free(filter_expression_a);
1620 ret = LTTNG_ERR_FATAL;
1621 goto error;
1622 }
1623 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
1624 }
29c62722 1625 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
00a62084
MD
1626 ret = event_kernel_enable_event(kchan, event,
1627 filter_expression, filter);
a969e101
MD
1628 /* We have passed ownership */
1629 filter_expression = NULL;
1630 filter = NULL;
29c62722
MD
1631 if (ret != LTTNG_OK) {
1632 if (channel_created) {
1633 /* Let's not leak a useless channel. */
1634 kernel_destroy_channel(kchan);
1635 }
00a62084
MD
1636 free(filter_expression_a);
1637 free(filter_a);
29c62722
MD
1638 goto error;
1639 }
1640 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
00a62084
MD
1641 ret = event_kernel_enable_event(kchan, event,
1642 filter_expression_a, filter_a);
60d21fa2
AB
1643 /* We have passed ownership */
1644 filter_expression_a = NULL;
1645 filter_a = NULL;
29c62722
MD
1646 if (ret != LTTNG_OK) {
1647 goto error;
1648 }
1649 break;
1650 }
6e6ef3d7
DG
1651 case LTTNG_EVENT_PROBE:
1652 case LTTNG_EVENT_FUNCTION:
1653 case LTTNG_EVENT_FUNCTION_ENTRY:
6e911cad 1654 case LTTNG_EVENT_TRACEPOINT:
00a62084
MD
1655 ret = event_kernel_enable_event(kchan, event,
1656 filter_expression, filter);
a969e101
MD
1657 /* We have passed ownership */
1658 filter_expression = NULL;
1659 filter = NULL;
6e911cad
MD
1660 if (ret != LTTNG_OK) {
1661 if (channel_created) {
1662 /* Let's not leak a useless channel. */
1663 kernel_destroy_channel(kchan);
1664 }
1665 goto error;
e5f5db7f 1666 }
6e911cad
MD
1667 break;
1668 case LTTNG_EVENT_SYSCALL:
00a62084
MD
1669 ret = event_kernel_enable_event(kchan, event,
1670 filter_expression, filter);
a969e101
MD
1671 /* We have passed ownership */
1672 filter_expression = NULL;
1673 filter = NULL;
e2b957af
MD
1674 if (ret != LTTNG_OK) {
1675 goto error;
1676 }
6e911cad
MD
1677 break;
1678 default:
1679 ret = LTTNG_ERR_UNK;
2f77fc4b
DG
1680 goto error;
1681 }
1682
1683 kernel_wait_quiescent(kernel_tracer_fd);
1684 break;
1685 }
1686 case LTTNG_DOMAIN_UST:
1687 {
1688 struct ltt_ust_channel *uchan;
1689 struct ltt_ust_session *usess = session->ust_session;
1690
1691 assert(usess);
1692
85076754
MD
1693 /*
1694 * If a non-default channel has been created in the
1695 * session, explicitely require that -c chan_name needs
1696 * to be provided.
1697 */
1698 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1699 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1700 goto error;
1701 }
1702
2f77fc4b
DG
1703 /* Get channel from global UST domain */
1704 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1705 channel_name);
1706 if (uchan == NULL) {
1707 /* Create default channel */
0a9c6494
DG
1708 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1709 usess->buffer_type);
2f77fc4b 1710 if (attr == NULL) {
f73fabfd 1711 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1712 goto error;
1713 }
1714 strncpy(attr->name, channel_name, sizeof(attr->name));
1715
1716 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1717 if (ret != LTTNG_OK) {
2f77fc4b
DG
1718 free(attr);
1719 goto error;
1720 }
1721 free(attr);
1722
1723 /* Get the newly created channel reference back */
1724 uchan = trace_ust_find_channel_by_name(
1725 usess->domain_global.channels, channel_name);
1726 assert(uchan);
1727 }
1728
141feb8c
JG
1729 if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) {
1730 /*
1731 * Don't allow users to add UST events to channels which
1732 * are assigned to a userspace subdomain (JUL, Log4J,
1733 * Python, etc.).
1734 */
1735 ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN;
1736 goto error;
1737 }
1738
dac8e046
JG
1739 if (!internal_event) {
1740 /*
1741 * Ensure the event name is not reserved for internal
1742 * use.
1743 */
1744 ret = validate_ust_event_name(event->name);
1745 if (ret) {
1746 WARN("Userspace event name %s failed validation.",
1747 event->name ?
1748 event->name : "NULL");
1749 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1750 goto error;
1751 }
1752 }
1753
2f77fc4b 1754 /* At this point, the session and channel exist on the tracer */
6b453b5e 1755 ret = event_ust_enable_tracepoint(usess, uchan, event,
88f06f15
JG
1756 filter_expression, filter, exclusion,
1757 internal_event);
49d21f93
MD
1758 /* We have passed ownership */
1759 filter_expression = NULL;
1760 filter = NULL;
1761 exclusion = NULL;
f73fabfd 1762 if (ret != LTTNG_OK) {
2f77fc4b
DG
1763 goto error;
1764 }
1765 break;
1766 }
5cdb6027 1767 case LTTNG_DOMAIN_LOG4J:
f20baf8e 1768 case LTTNG_DOMAIN_JUL:
0e115563 1769 case LTTNG_DOMAIN_PYTHON:
f20baf8e 1770 {
da6c3a50 1771 const char *default_event_name, *default_chan_name;
fefd409b 1772 struct agent *agt;
f20baf8e
DG
1773 struct lttng_event uevent;
1774 struct lttng_domain tmp_dom;
1775 struct ltt_ust_session *usess = session->ust_session;
1776
1777 assert(usess);
1778
5cdb6027 1779 agt = trace_ust_find_agent(usess, domain->type);
fefd409b 1780 if (!agt) {
5cdb6027 1781 agt = agent_create(domain->type);
fefd409b 1782 if (!agt) {
e5b3c48c 1783 ret = LTTNG_ERR_NOMEM;
fefd409b
DG
1784 goto error;
1785 }
1786 agent_add(agt, usess->agents);
1787 }
1788
022d91ba 1789 /* Create the default tracepoint. */
996de3c7 1790 memset(&uevent, 0, sizeof(uevent));
f20baf8e
DG
1791 uevent.type = LTTNG_EVENT_TRACEPOINT;
1792 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
51755dc8
JG
1793 default_event_name = event_get_default_agent_ust_name(
1794 domain->type);
da6c3a50 1795 if (!default_event_name) {
e5b3c48c 1796 ret = LTTNG_ERR_FATAL;
da6c3a50 1797 goto error;
f43f95a9 1798 }
da6c3a50 1799 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
f20baf8e
DG
1800 uevent.name[sizeof(uevent.name) - 1] = '\0';
1801
1802 /*
1803 * The domain type is changed because we are about to enable the
1804 * default channel and event for the JUL domain that are hardcoded.
1805 * This happens in the UST domain.
1806 */
1807 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1808 tmp_dom.type = LTTNG_DOMAIN_UST;
1809
0e115563
DG
1810 switch (domain->type) {
1811 case LTTNG_DOMAIN_LOG4J:
da6c3a50 1812 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
0e115563
DG
1813 break;
1814 case LTTNG_DOMAIN_JUL:
da6c3a50 1815 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
0e115563
DG
1816 break;
1817 case LTTNG_DOMAIN_PYTHON:
1818 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
1819 break;
1820 default:
e98a44b0 1821 /* The switch/case we are in makes this impossible */
0e115563 1822 assert(0);
da6c3a50
DG
1823 }
1824
971da06a 1825 {
8404118c 1826 char *filter_expression_copy = NULL;
51755dc8 1827 struct lttng_filter_bytecode *filter_copy = NULL;
971da06a
JG
1828
1829 if (filter) {
51755dc8
JG
1830 const size_t filter_size = sizeof(
1831 struct lttng_filter_bytecode)
1832 + filter->len;
1833
1834 filter_copy = zmalloc(filter_size);
971da06a 1835 if (!filter_copy) {
018096a4 1836 ret = LTTNG_ERR_NOMEM;
b742e3e2 1837 goto error;
971da06a 1838 }
51755dc8 1839 memcpy(filter_copy, filter, filter_size);
971da06a 1840
8404118c
JG
1841 filter_expression_copy =
1842 strdup(filter_expression);
1843 if (!filter_expression) {
1844 ret = LTTNG_ERR_NOMEM;
51755dc8
JG
1845 }
1846
1847 if (!filter_expression_copy || !filter_copy) {
1848 free(filter_expression_copy);
1849 free(filter_copy);
1850 goto error;
8404118c 1851 }
971da06a
JG
1852 }
1853
88f06f15 1854 ret = cmd_enable_event_internal(session, &tmp_dom,
971da06a 1855 (char *) default_chan_name,
8404118c
JG
1856 &uevent, filter_expression_copy,
1857 filter_copy, NULL, wpipe);
971da06a
JG
1858 }
1859
f20baf8e
DG
1860 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1861 goto error;
1862 }
1863
1864 /* The wild card * means that everything should be enabled. */
1865 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
8404118c
JG
1866 ret = event_agent_enable_all(usess, agt, event, filter,
1867 filter_expression);
f20baf8e 1868 } else {
8404118c
JG
1869 ret = event_agent_enable(usess, agt, event, filter,
1870 filter_expression);
f20baf8e 1871 }
51755dc8
JG
1872 filter = NULL;
1873 filter_expression = NULL;
f20baf8e
DG
1874 if (ret != LTTNG_OK) {
1875 goto error;
1876 }
1877
1878 break;
1879 }
2f77fc4b 1880 default:
f73fabfd 1881 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1882 goto error;
1883 }
1884
f73fabfd 1885 ret = LTTNG_OK;
2f77fc4b
DG
1886
1887error:
49d21f93
MD
1888 free(filter_expression);
1889 free(filter);
1890 free(exclusion);
2223c96f 1891 rcu_read_unlock();
2f77fc4b
DG
1892 return ret;
1893}
1894
88f06f15
JG
1895/*
1896 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1897 * We own filter, exclusion, and filter_expression.
1898 */
1899int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1900 char *channel_name, struct lttng_event *event,
1901 char *filter_expression,
1902 struct lttng_filter_bytecode *filter,
1903 struct lttng_event_exclusion *exclusion,
1904 int wpipe)
1905{
1906 return _cmd_enable_event(session, domain, channel_name, event,
1907 filter_expression, filter, exclusion, wpipe, false);
1908}
1909
1910/*
1911 * Enable an event which is internal to LTTng. An internal should
1912 * never be made visible to clients and are immune to checks such as
1913 * reserved names.
1914 */
1915static int cmd_enable_event_internal(struct ltt_session *session,
1916 struct lttng_domain *domain,
1917 char *channel_name, struct lttng_event *event,
1918 char *filter_expression,
1919 struct lttng_filter_bytecode *filter,
1920 struct lttng_event_exclusion *exclusion,
1921 int wpipe)
1922{
1923 return _cmd_enable_event(session, domain, channel_name, event,
1924 filter_expression, filter, exclusion, wpipe, true);
1925}
1926
2f77fc4b
DG
1927/*
1928 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1929 */
56a37563
JG
1930ssize_t cmd_list_tracepoints(enum lttng_domain_type domain,
1931 struct lttng_event **events)
2f77fc4b
DG
1932{
1933 int ret;
1934 ssize_t nb_events = 0;
1935
1936 switch (domain) {
1937 case LTTNG_DOMAIN_KERNEL:
1938 nb_events = kernel_list_events(kernel_tracer_fd, events);
1939 if (nb_events < 0) {
f73fabfd 1940 ret = LTTNG_ERR_KERN_LIST_FAIL;
2f77fc4b
DG
1941 goto error;
1942 }
1943 break;
1944 case LTTNG_DOMAIN_UST:
1945 nb_events = ust_app_list_events(events);
1946 if (nb_events < 0) {
f73fabfd 1947 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
1948 goto error;
1949 }
1950 break;
5cdb6027 1951 case LTTNG_DOMAIN_LOG4J:
3c6a091f 1952 case LTTNG_DOMAIN_JUL:
0e115563 1953 case LTTNG_DOMAIN_PYTHON:
f60140a1 1954 nb_events = agent_list_events(events, domain);
3c6a091f
DG
1955 if (nb_events < 0) {
1956 ret = LTTNG_ERR_UST_LIST_FAIL;
1957 goto error;
1958 }
1959 break;
2f77fc4b 1960 default:
f73fabfd 1961 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1962 goto error;
1963 }
1964
1965 return nb_events;
1966
1967error:
1968 /* Return negative value to differentiate return code */
1969 return -ret;
1970}
1971
1972/*
1973 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1974 */
56a37563 1975ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain,
2f77fc4b
DG
1976 struct lttng_event_field **fields)
1977{
1978 int ret;
1979 ssize_t nb_fields = 0;
1980
1981 switch (domain) {
1982 case LTTNG_DOMAIN_UST:
1983 nb_fields = ust_app_list_event_fields(fields);
1984 if (nb_fields < 0) {
f73fabfd 1985 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
1986 goto error;
1987 }
1988 break;
1989 case LTTNG_DOMAIN_KERNEL:
1990 default: /* fall-through */
f73fabfd 1991 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1992 goto error;
1993 }
1994
1995 return nb_fields;
1996
1997error:
1998 /* Return negative value to differentiate return code */
1999 return -ret;
2000}
2001
834978fd
DG
2002ssize_t cmd_list_syscalls(struct lttng_event **events)
2003{
2004 return syscall_table_list(events);
2005}
2006
a5dfbb9d
MD
2007/*
2008 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2009 *
2010 * Called with session lock held.
2011 */
2012ssize_t cmd_list_tracker_pids(struct ltt_session *session,
56a37563 2013 enum lttng_domain_type domain, int32_t **pids)
a5dfbb9d
MD
2014{
2015 int ret;
2016 ssize_t nr_pids = 0;
2017
2018 switch (domain) {
2019 case LTTNG_DOMAIN_KERNEL:
2020 {
2021 struct ltt_kernel_session *ksess;
2022
2023 ksess = session->kernel_session;
2024 nr_pids = kernel_list_tracker_pids(ksess, pids);
2025 if (nr_pids < 0) {
2026 ret = LTTNG_ERR_KERN_LIST_FAIL;
2027 goto error;
2028 }
2029 break;
2030 }
2031 case LTTNG_DOMAIN_UST:
2032 {
2033 struct ltt_ust_session *usess;
2034
2035 usess = session->ust_session;
2036 nr_pids = trace_ust_list_tracker_pids(usess, pids);
2037 if (nr_pids < 0) {
2038 ret = LTTNG_ERR_UST_LIST_FAIL;
2039 goto error;
2040 }
2041 break;
2042 }
2043 case LTTNG_DOMAIN_LOG4J:
2044 case LTTNG_DOMAIN_JUL:
2045 case LTTNG_DOMAIN_PYTHON:
2046 default:
2047 ret = LTTNG_ERR_UND;
2048 goto error;
2049 }
2050
2051 return nr_pids;
2052
2053error:
2054 /* Return negative value to differentiate return code */
2055 return -ret;
2056}
2057
2f77fc4b
DG
2058/*
2059 * Command LTTNG_START_TRACE processed by the client thread.
a9ad0c8f
MD
2060 *
2061 * Called with session mutex held.
2f77fc4b
DG
2062 */
2063int cmd_start_trace(struct ltt_session *session)
2064{
2065 int ret;
cde3e505 2066 unsigned long nb_chan = 0;
2f77fc4b
DG
2067 struct ltt_kernel_session *ksession;
2068 struct ltt_ust_session *usess;
2f77fc4b
DG
2069
2070 assert(session);
2071
2072 /* Ease our life a bit ;) */
2073 ksession = session->kernel_session;
2074 usess = session->ust_session;
2075
8382cf6f
DG
2076 /* Is the session already started? */
2077 if (session->active) {
f73fabfd 2078 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2079 goto error;
2080 }
2081
cde3e505
DG
2082 /*
2083 * Starting a session without channel is useless since after that it's not
2084 * possible to enable channel thus inform the client.
2085 */
2086 if (usess && usess->domain_global.channels) {
2087 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
2088 }
2089 if (ksession) {
2090 nb_chan += ksession->channel_count;
2091 }
2092 if (!nb_chan) {
2093 ret = LTTNG_ERR_NO_CHANNEL;
2094 goto error;
2095 }
2096
2f77fc4b
DG
2097 /* Kernel tracing */
2098 if (ksession != NULL) {
9b6c7ec5
DG
2099 ret = start_kernel_session(ksession, kernel_tracer_fd);
2100 if (ret != LTTNG_OK) {
2f77fc4b
DG
2101 goto error;
2102 }
2f77fc4b
DG
2103 }
2104
2105 /* Flag session that trace should start automatically */
2106 if (usess) {
14fb1ebe
DG
2107 /*
2108 * Even though the start trace might fail, flag this session active so
2109 * other application coming in are started by default.
2110 */
2111 usess->active = 1;
2f77fc4b
DG
2112
2113 ret = ust_app_start_trace_all(usess);
2114 if (ret < 0) {
f73fabfd 2115 ret = LTTNG_ERR_UST_START_FAIL;
2f77fc4b
DG
2116 goto error;
2117 }
2118 }
2119
8382cf6f
DG
2120 /* Flag this after a successful start. */
2121 session->has_been_started = 1;
2122 session->active = 1;
9b6c7ec5 2123
f73fabfd 2124 ret = LTTNG_OK;
2f77fc4b
DG
2125
2126error:
2127 return ret;
2128}
2129
2130/*
2131 * Command LTTNG_STOP_TRACE processed by the client thread.
2132 */
2133int cmd_stop_trace(struct ltt_session *session)
2134{
2135 int ret;
2136 struct ltt_kernel_channel *kchan;
2137 struct ltt_kernel_session *ksession;
2138 struct ltt_ust_session *usess;
2139
2140 assert(session);
2141
2142 /* Short cut */
2143 ksession = session->kernel_session;
2144 usess = session->ust_session;
2145
8382cf6f
DG
2146 /* Session is not active. Skip everythong and inform the client. */
2147 if (!session->active) {
f73fabfd 2148 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2f77fc4b
DG
2149 goto error;
2150 }
2151
2f77fc4b 2152 /* Kernel tracer */
14fb1ebe 2153 if (ksession && ksession->active) {
2f77fc4b
DG
2154 DBG("Stop kernel tracing");
2155
2156 /* Flush metadata if exist */
2157 if (ksession->metadata_stream_fd >= 0) {
2158 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2159 if (ret < 0) {
2160 ERR("Kernel metadata flush failed");
2161 }
2162 }
2163
2164 /* Flush all buffers before stopping */
2165 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2166 ret = kernel_flush_buffer(kchan);
2167 if (ret < 0) {
2168 ERR("Kernel flush buffer error");
2169 }
2170 }
2171
2172 ret = kernel_stop_session(ksession);
2173 if (ret < 0) {
f73fabfd 2174 ret = LTTNG_ERR_KERN_STOP_FAIL;
2f77fc4b
DG
2175 goto error;
2176 }
2177
2178 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5 2179
14fb1ebe 2180 ksession->active = 0;
2f77fc4b
DG
2181 }
2182
14fb1ebe
DG
2183 if (usess && usess->active) {
2184 /*
2185 * Even though the stop trace might fail, flag this session inactive so
2186 * other application coming in are not started by default.
2187 */
2188 usess->active = 0;
2f77fc4b
DG
2189
2190 ret = ust_app_stop_trace_all(usess);
2191 if (ret < 0) {
f73fabfd 2192 ret = LTTNG_ERR_UST_STOP_FAIL;
2f77fc4b
DG
2193 goto error;
2194 }
2195 }
2196
8382cf6f
DG
2197 /* Flag inactive after a successful stop. */
2198 session->active = 0;
f73fabfd 2199 ret = LTTNG_OK;
2f77fc4b
DG
2200
2201error:
2202 return ret;
2203}
2204
2205/*
2206 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2207 */
bda32d56
JG
2208int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2209 struct lttng_uri *uris)
2f77fc4b
DG
2210{
2211 int ret, i;
2212 struct ltt_kernel_session *ksess = session->kernel_session;
2213 struct ltt_ust_session *usess = session->ust_session;
2f77fc4b
DG
2214
2215 assert(session);
2216 assert(uris);
2217 assert(nb_uri > 0);
2218
8382cf6f
DG
2219 /* Can't set consumer URI if the session is active. */
2220 if (session->active) {
f73fabfd 2221 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2222 goto error;
2223 }
2224
bda32d56 2225 /* Set the "global" consumer URIs */
2f77fc4b 2226 for (i = 0; i < nb_uri; i++) {
bda32d56
JG
2227 ret = add_uri_to_consumer(session->consumer,
2228 &uris[i], 0, session->name);
a74934ba 2229 if (ret != LTTNG_OK) {
2f77fc4b
DG
2230 goto error;
2231 }
2f77fc4b
DG
2232 }
2233
bda32d56
JG
2234 /* Set UST session URIs */
2235 if (session->ust_session) {
2236 for (i = 0; i < nb_uri; i++) {
2237 ret = add_uri_to_consumer(
2238 session->ust_session->consumer,
2239 &uris[i], LTTNG_DOMAIN_UST,
2240 session->name);
2241 if (ret != LTTNG_OK) {
2242 goto error;
2243 }
2244 }
2245 }
2246
2247 /* Set kernel session URIs */
2248 if (session->kernel_session) {
2249 for (i = 0; i < nb_uri; i++) {
2250 ret = add_uri_to_consumer(
2251 session->kernel_session->consumer,
2252 &uris[i], LTTNG_DOMAIN_KERNEL,
2253 session->name);
2254 if (ret != LTTNG_OK) {
2255 goto error;
2256 }
2257 }
2258 }
2259
7ab70fe0
DG
2260 /*
2261 * Make sure to set the session in output mode after we set URI since a
2262 * session can be created without URL (thus flagged in no output mode).
2263 */
2264 session->output_traces = 1;
2265 if (ksess) {
2266 ksess->output_traces = 1;
bda32d56
JG
2267 }
2268
2269 if (usess) {
7ab70fe0
DG
2270 usess->output_traces = 1;
2271 }
2272
2f77fc4b 2273 /* All good! */
f73fabfd 2274 ret = LTTNG_OK;
2f77fc4b
DG
2275
2276error:
2277 return ret;
2278}
2279
2280/*
2281 * Command LTTNG_CREATE_SESSION processed by the client thread.
2282 */
2283int cmd_create_session_uri(char *name, struct lttng_uri *uris,
ecc48a90 2284 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2f77fc4b
DG
2285{
2286 int ret;
2f77fc4b
DG
2287 struct ltt_session *session;
2288
2289 assert(name);
2bba9e53 2290 assert(creds);
785d2d0d 2291
2f77fc4b
DG
2292 /*
2293 * Verify if the session already exist
2294 *
2295 * XXX: There is no need for the session lock list here since the caller
2296 * (process_client_msg) is holding it. We might want to change that so a
2297 * single command does not lock the entire session list.
2298 */
2299 session = session_find_by_name(name);
2300 if (session != NULL) {
f73fabfd 2301 ret = LTTNG_ERR_EXIST_SESS;
2f77fc4b
DG
2302 goto find_error;
2303 }
2304
2305 /* Create tracing session in the registry */
dec56f6c 2306 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2f77fc4b 2307 LTTNG_SOCK_GET_GID_CRED(creds));
f73fabfd 2308 if (ret != LTTNG_OK) {
2f77fc4b
DG
2309 goto session_error;
2310 }
2311
2312 /*
2313 * Get the newly created session pointer back
2314 *
2315 * XXX: There is no need for the session lock list here since the caller
2316 * (process_client_msg) is holding it. We might want to change that so a
2317 * single command does not lock the entire session list.
2318 */
2319 session = session_find_by_name(name);
2320 assert(session);
2321
ecc48a90 2322 session->live_timer = live_timer;
2f77fc4b
DG
2323 /* Create default consumer output for the session not yet created. */
2324 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2325 if (session->consumer == NULL) {
f73fabfd 2326 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2327 goto consumer_error;
2328 }
2329
2bba9e53 2330 if (uris) {
bda32d56 2331 ret = cmd_set_consumer_uri(session, nb_uri, uris);
2bba9e53
DG
2332 if (ret != LTTNG_OK) {
2333 goto consumer_error;
2334 }
2335 session->output_traces = 1;
2336 } else {
2337 session->output_traces = 0;
2338 DBG2("Session %s created with no output", session->name);
2f77fc4b
DG
2339 }
2340
2341 session->consumer->enabled = 1;
2342
f73fabfd 2343 return LTTNG_OK;
2f77fc4b
DG
2344
2345consumer_error:
2346 session_destroy(session);
2347session_error:
2348find_error:
2349 return ret;
2350}
2351
27babd3a
DG
2352/*
2353 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2354 */
2355int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2356 size_t nb_uri, lttng_sock_cred *creds)
2357{
2358 int ret;
2359 struct ltt_session *session;
2360 struct snapshot_output *new_output = NULL;
2361
2362 assert(name);
2363 assert(creds);
2364
2365 /*
2366 * Create session in no output mode with URIs set to NULL. The uris we've
2367 * received are for a default snapshot output if one.
2368 */
ae58b817 2369 ret = cmd_create_session_uri(name, NULL, 0, creds, 0);
27babd3a
DG
2370 if (ret != LTTNG_OK) {
2371 goto error;
2372 }
2373
2374 /* Get the newly created session pointer back. This should NEVER fail. */
2375 session = session_find_by_name(name);
2376 assert(session);
2377
2378 /* Flag session for snapshot mode. */
2379 session->snapshot_mode = 1;
2380
2381 /* Skip snapshot output creation if no URI is given. */
2382 if (nb_uri == 0) {
2383 goto end;
2384 }
2385
2386 new_output = snapshot_output_alloc();
2387 if (!new_output) {
2388 ret = LTTNG_ERR_NOMEM;
2389 goto error_snapshot_alloc;
2390 }
2391
2392 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2393 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2394 if (ret < 0) {
2395 if (ret == -ENOMEM) {
2396 ret = LTTNG_ERR_NOMEM;
2397 } else {
2398 ret = LTTNG_ERR_INVALID;
2399 }
2400 goto error_snapshot;
2401 }
2402
2403 rcu_read_lock();
2404 snapshot_add_output(&session->snapshot, new_output);
2405 rcu_read_unlock();
2406
2407end:
2408 return LTTNG_OK;
2409
2410error_snapshot:
2411 snapshot_output_destroy(new_output);
2412error_snapshot_alloc:
2413 session_destroy(session);
2414error:
2415 return ret;
2416}
2417
2f77fc4b
DG
2418/*
2419 * Command LTTNG_DESTROY_SESSION processed by the client thread.
a9ad0c8f
MD
2420 *
2421 * Called with session lock held.
2f77fc4b
DG
2422 */
2423int cmd_destroy_session(struct ltt_session *session, int wpipe)
2424{
2425 int ret;
2426 struct ltt_ust_session *usess;
2427 struct ltt_kernel_session *ksess;
2428
2429 /* Safety net */
2430 assert(session);
2431
2432 usess = session->ust_session;
2433 ksess = session->kernel_session;
2434
2435 /* Clean kernel session teardown */
2436 kernel_destroy_session(ksess);
2437
2438 /* UST session teardown */
2439 if (usess) {
2440 /* Close any relayd session */
2441 consumer_output_send_destroy_relayd(usess->consumer);
2442
2443 /* Destroy every UST application related to this session. */
2444 ret = ust_app_destroy_trace_all(usess);
2445 if (ret) {
2446 ERR("Error in ust_app_destroy_trace_all");
2447 }
2448
2449 /* Clean up the rest. */
2450 trace_ust_destroy_session(usess);
2451 }
2452
2453 /*
2454 * Must notify the kernel thread here to update it's poll set in order to
2455 * remove the channel(s)' fd just destroyed.
2456 */
2457 ret = notify_thread_pipe(wpipe);
2458 if (ret < 0) {
2459 PERROR("write kernel poll pipe");
2460 }
2461
2462 ret = session_destroy(session);
2463
2464 return ret;
2465}
2466
2467/*
2468 * Command LTTNG_CALIBRATE processed by the client thread.
2469 */
56a37563
JG
2470int cmd_calibrate(enum lttng_domain_type domain,
2471 struct lttng_calibrate *calibrate)
2f77fc4b
DG
2472{
2473 int ret;
2474
2475 switch (domain) {
2476 case LTTNG_DOMAIN_KERNEL:
2477 {
2478 struct lttng_kernel_calibrate kcalibrate;
2479
2e84128e
DG
2480 switch (calibrate->type) {
2481 case LTTNG_CALIBRATE_FUNCTION:
2482 default:
2483 /* Default and only possible calibrate option. */
2484 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2485 break;
2486 }
2487
2f77fc4b
DG
2488 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2489 if (ret < 0) {
f73fabfd 2490 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2f77fc4b
DG
2491 goto error;
2492 }
2493 break;
2494 }
2495 case LTTNG_DOMAIN_UST:
2496 {
2497 struct lttng_ust_calibrate ucalibrate;
2498
2e84128e
DG
2499 switch (calibrate->type) {
2500 case LTTNG_CALIBRATE_FUNCTION:
2501 default:
2502 /* Default and only possible calibrate option. */
2503 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2504 break;
2505 }
2506
2f77fc4b
DG
2507 ret = ust_app_calibrate_glb(&ucalibrate);
2508 if (ret < 0) {
f73fabfd 2509 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2f77fc4b
DG
2510 goto error;
2511 }
2512 break;
2513 }
2514 default:
f73fabfd 2515 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2516 goto error;
2517 }
2518
f73fabfd 2519 ret = LTTNG_OK;
2f77fc4b
DG
2520
2521error:
2522 return ret;
2523}
2524
2525/*
2526 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2527 */
56a37563
JG
2528int cmd_register_consumer(struct ltt_session *session,
2529 enum lttng_domain_type domain, const char *sock_path,
2530 struct consumer_data *cdata)
2f77fc4b
DG
2531{
2532 int ret, sock;
dd81b457 2533 struct consumer_socket *socket = NULL;
2f77fc4b
DG
2534
2535 assert(session);
2536 assert(cdata);
2537 assert(sock_path);
2538
2539 switch (domain) {
2540 case LTTNG_DOMAIN_KERNEL:
2541 {
2542 struct ltt_kernel_session *ksess = session->kernel_session;
2543
2544 assert(ksess);
2545
2546 /* Can't register a consumer if there is already one */
2547 if (ksess->consumer_fds_sent != 0) {
f73fabfd 2548 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
2549 goto error;
2550 }
2551
2552 sock = lttcomm_connect_unix_sock(sock_path);
2553 if (sock < 0) {
f73fabfd 2554 ret = LTTNG_ERR_CONNECT_FAIL;
2f77fc4b
DG
2555 goto error;
2556 }
4ce514c4 2557 cdata->cmd_sock = sock;
2f77fc4b 2558
4ce514c4 2559 socket = consumer_allocate_socket(&cdata->cmd_sock);
2f77fc4b 2560 if (socket == NULL) {
f66c074c
DG
2561 ret = close(sock);
2562 if (ret < 0) {
2563 PERROR("close register consumer");
2564 }
4ce514c4 2565 cdata->cmd_sock = -1;
f73fabfd 2566 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2567 goto error;
2568 }
2569
2570 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2571 if (socket->lock == NULL) {
2572 PERROR("zmalloc pthread mutex");
f73fabfd 2573 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2574 goto error;
2575 }
2576 pthread_mutex_init(socket->lock, NULL);
2577 socket->registered = 1;
2578
2579 rcu_read_lock();
2580 consumer_add_socket(socket, ksess->consumer);
2581 rcu_read_unlock();
2582
2583 pthread_mutex_lock(&cdata->pid_mutex);
2584 cdata->pid = -1;
2585 pthread_mutex_unlock(&cdata->pid_mutex);
2586
2587 break;
2588 }
2589 default:
2590 /* TODO: Userspace tracing */
f73fabfd 2591 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2592 goto error;
2593 }
2594
dd81b457 2595 return LTTNG_OK;
2f77fc4b
DG
2596
2597error:
dd81b457
DG
2598 if (socket) {
2599 consumer_destroy_socket(socket);
2600 }
2f77fc4b
DG
2601 return ret;
2602}
2603
2604/*
2605 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2606 */
2607ssize_t cmd_list_domains(struct ltt_session *session,
2608 struct lttng_domain **domains)
2609{
2610 int ret, index = 0;
2611 ssize_t nb_dom = 0;
fefd409b
DG
2612 struct agent *agt;
2613 struct lttng_ht_iter iter;
2f77fc4b
DG
2614
2615 if (session->kernel_session != NULL) {
2616 DBG3("Listing domains found kernel domain");
2617 nb_dom++;
2618 }
2619
2620 if (session->ust_session != NULL) {
2621 DBG3("Listing domains found UST global domain");
2622 nb_dom++;
3c6a091f 2623
e0a74f01 2624 rcu_read_lock();
fefd409b
DG
2625 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2626 agt, node.node) {
2627 if (agt->being_used) {
2628 nb_dom++;
2629 }
3c6a091f 2630 }
e0a74f01 2631 rcu_read_unlock();
2f77fc4b
DG
2632 }
2633
fa64dfb4
JG
2634 if (!nb_dom) {
2635 goto end;
2636 }
2637
2f77fc4b
DG
2638 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2639 if (*domains == NULL) {
f73fabfd 2640 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2641 goto error;
2642 }
2643
2644 if (session->kernel_session != NULL) {
2645 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
b5edb9e8
PP
2646
2647 /* Kernel session buffer type is always GLOBAL */
2648 (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL;
2649
2f77fc4b
DG
2650 index++;
2651 }
2652
2653 if (session->ust_session != NULL) {
2654 (*domains)[index].type = LTTNG_DOMAIN_UST;
88c5f0d8 2655 (*domains)[index].buf_type = session->ust_session->buffer_type;
2f77fc4b 2656 index++;
3c6a091f 2657
e0a74f01 2658 rcu_read_lock();
fefd409b
DG
2659 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2660 agt, node.node) {
2661 if (agt->being_used) {
2662 (*domains)[index].type = agt->domain;
2663 (*domains)[index].buf_type = session->ust_session->buffer_type;
2664 index++;
2665 }
3c6a091f 2666 }
e0a74f01 2667 rcu_read_unlock();
2f77fc4b 2668 }
fa64dfb4 2669end:
2f77fc4b
DG
2670 return nb_dom;
2671
2672error:
f73fabfd
DG
2673 /* Return negative value to differentiate return code */
2674 return -ret;
2f77fc4b
DG
2675}
2676
2677
2678/*
2679 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2680 */
56a37563
JG
2681ssize_t cmd_list_channels(enum lttng_domain_type domain,
2682 struct ltt_session *session, struct lttng_channel **channels)
2f77fc4b
DG
2683{
2684 int ret;
2685 ssize_t nb_chan = 0;
2686
2687 switch (domain) {
2688 case LTTNG_DOMAIN_KERNEL:
2689 if (session->kernel_session != NULL) {
2690 nb_chan = session->kernel_session->channel_count;
2691 }
2692 DBG3("Number of kernel channels %zd", nb_chan);
c7d620a2
DG
2693 if (nb_chan <= 0) {
2694 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2695 }
2f77fc4b
DG
2696 break;
2697 case LTTNG_DOMAIN_UST:
2698 if (session->ust_session != NULL) {
7ffc31a2 2699 rcu_read_lock();
2f77fc4b 2700 nb_chan = lttng_ht_get_count(
7ffc31a2
JG
2701 session->ust_session->domain_global.channels);
2702 rcu_read_unlock();
2f77fc4b
DG
2703 }
2704 DBG3("Number of UST global channels %zd", nb_chan);
ade7ce52 2705 if (nb_chan < 0) {
c7d620a2 2706 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
ade7ce52 2707 goto error;
c7d620a2 2708 }
2f77fc4b
DG
2709 break;
2710 default:
f73fabfd 2711 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2712 goto error;
2713 }
2714
2715 if (nb_chan > 0) {
2716 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2717 if (*channels == NULL) {
f73fabfd 2718 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2719 goto error;
2720 }
2721
2722 list_lttng_channels(domain, session, *channels);
2f77fc4b
DG
2723 }
2724
2725 return nb_chan;
2726
2727error:
f73fabfd
DG
2728 /* Return negative value to differentiate return code */
2729 return -ret;
2f77fc4b
DG
2730}
2731
2732/*
2733 * Command LTTNG_LIST_EVENTS processed by the client thread.
2734 */
56a37563
JG
2735ssize_t cmd_list_events(enum lttng_domain_type domain,
2736 struct ltt_session *session, char *channel_name,
2737 struct lttng_event **events)
2f77fc4b
DG
2738{
2739 int ret = 0;
2740 ssize_t nb_event = 0;
2741
2742 switch (domain) {
2743 case LTTNG_DOMAIN_KERNEL:
2744 if (session->kernel_session != NULL) {
2745 nb_event = list_lttng_kernel_events(channel_name,
2746 session->kernel_session, events);
2747 }
2748 break;
2749 case LTTNG_DOMAIN_UST:
2750 {
2751 if (session->ust_session != NULL) {
2752 nb_event = list_lttng_ust_global_events(channel_name,
2753 &session->ust_session->domain_global, events);
2754 }
2755 break;
2756 }
5cdb6027 2757 case LTTNG_DOMAIN_LOG4J:
3c6a091f 2758 case LTTNG_DOMAIN_JUL:
0e115563 2759 case LTTNG_DOMAIN_PYTHON:
3c6a091f 2760 if (session->ust_session) {
fefd409b
DG
2761 struct lttng_ht_iter iter;
2762 struct agent *agt;
2763
b11feea5 2764 rcu_read_lock();
fefd409b
DG
2765 cds_lfht_for_each_entry(session->ust_session->agents->ht,
2766 &iter.iter, agt, node.node) {
1dfd9906
JG
2767 if (agt->domain == domain) {
2768 nb_event = list_lttng_agent_events(
2769 agt, events);
2770 break;
2771 }
fefd409b 2772 }
b11feea5 2773 rcu_read_unlock();
3c6a091f
DG
2774 }
2775 break;
2f77fc4b 2776 default:
f73fabfd 2777 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2778 goto error;
2779 }
2780
f73fabfd 2781 return nb_event;
2f77fc4b
DG
2782
2783error:
f73fabfd
DG
2784 /* Return negative value to differentiate return code */
2785 return -ret;
2f77fc4b
DG
2786}
2787
2788/*
2789 * Using the session list, filled a lttng_session array to send back to the
2790 * client for session listing.
2791 *
2792 * The session list lock MUST be acquired before calling this function. Use
2793 * session_lock_list() and session_unlock_list().
2794 */
2795void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2796 gid_t gid)
2797{
2798 int ret;
2799 unsigned int i = 0;
2800 struct ltt_session *session;
2801 struct ltt_session_list *list = session_get_list();
2802
2803 DBG("Getting all available session for UID %d GID %d",
2804 uid, gid);
2805 /*
2806 * Iterate over session list and append data after the control struct in
2807 * the buffer.
2808 */
2809 cds_list_for_each_entry(session, &list->head, list) {
2810 /*
2811 * Only list the sessions the user can control.
2812 */
2813 if (!session_access_ok(session, uid, gid)) {
2814 continue;
2815 }
2816
2817 struct ltt_kernel_session *ksess = session->kernel_session;
2818 struct ltt_ust_session *usess = session->ust_session;
2819
2820 if (session->consumer->type == CONSUMER_DST_NET ||
2821 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2822 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2823 ret = build_network_session_path(sessions[i].path,
dec56f6c 2824 sizeof(sessions[i].path), session);
2f77fc4b 2825 } else {
dec56f6c 2826 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2f77fc4b
DG
2827 session->consumer->dst.trace_path);
2828 }
2829 if (ret < 0) {
2830 PERROR("snprintf session path");
2831 continue;
2832 }
2833
2834 strncpy(sessions[i].name, session->name, NAME_MAX);
2835 sessions[i].name[NAME_MAX - 1] = '\0';
8382cf6f 2836 sessions[i].enabled = session->active;
2cbf8fed 2837 sessions[i].snapshot_mode = session->snapshot_mode;
8960e9cd 2838 sessions[i].live_timer_interval = session->live_timer;
2f77fc4b
DG
2839 i++;
2840 }
2841}
2842
806e2684 2843/*
6d805429 2844 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
d3f14b8a 2845 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
806e2684 2846 */
6d805429 2847int cmd_data_pending(struct ltt_session *session)
806e2684
DG
2848{
2849 int ret;
2850 struct ltt_kernel_session *ksess = session->kernel_session;
2851 struct ltt_ust_session *usess = session->ust_session;
2852
2853 assert(session);
2854
2855 /* Session MUST be stopped to ask for data availability. */
8382cf6f 2856 if (session->active) {
806e2684
DG
2857 ret = LTTNG_ERR_SESSION_STARTED;
2858 goto error;
3a89d11a
DG
2859 } else {
2860 /*
2861 * If stopped, just make sure we've started before else the above call
2862 * will always send that there is data pending.
2863 *
2864 * The consumer assumes that when the data pending command is received,
2865 * the trace has been started before or else no output data is written
2866 * by the streams which is a condition for data pending. So, this is
2867 * *VERY* important that we don't ask the consumer before a start
2868 * trace.
2869 */
8382cf6f 2870 if (!session->has_been_started) {
3a89d11a
DG
2871 ret = 0;
2872 goto error;
2873 }
806e2684
DG
2874 }
2875
2876 if (ksess && ksess->consumer) {
6d805429
DG
2877 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2878 if (ret == 1) {
806e2684
DG
2879 /* Data is still being extracted for the kernel. */
2880 goto error;
2881 }
2882 }
2883
2884 if (usess && usess->consumer) {
6d805429
DG
2885 ret = consumer_is_data_pending(usess->id, usess->consumer);
2886 if (ret == 1) {
806e2684
DG
2887 /* Data is still being extracted for the kernel. */
2888 goto error;
2889 }
2890 }
2891
2892 /* Data is ready to be read by a viewer */
6d805429 2893 ret = 0;
806e2684
DG
2894
2895error:
2896 return ret;
2897}
2898
6dc3064a
DG
2899/*
2900 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2901 *
2902 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2903 */
2904int cmd_snapshot_add_output(struct ltt_session *session,
2905 struct lttng_snapshot_output *output, uint32_t *id)
2906{
2907 int ret;
2908 struct snapshot_output *new_output;
2909
2910 assert(session);
2911 assert(output);
2912
2913 DBG("Cmd snapshot add output for session %s", session->name);
2914
2915 /*
d3f14b8a
MD
2916 * Permission denied to create an output if the session is not
2917 * set in no output mode.
6dc3064a
DG
2918 */
2919 if (session->output_traces) {
2920 ret = LTTNG_ERR_EPERM;
2921 goto error;
2922 }
2923
2924 /* Only one output is allowed until we have the "tee" feature. */
2925 if (session->snapshot.nb_output == 1) {
2926 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2927 goto error;
2928 }
2929
2930 new_output = snapshot_output_alloc();
2931 if (!new_output) {
2932 ret = LTTNG_ERR_NOMEM;
2933 goto error;
2934 }
2935
2936 ret = snapshot_output_init(output->max_size, output->name,
2937 output->ctrl_url, output->data_url, session->consumer, new_output,
2938 &session->snapshot);
2939 if (ret < 0) {
2940 if (ret == -ENOMEM) {
2941 ret = LTTNG_ERR_NOMEM;
2942 } else {
2943 ret = LTTNG_ERR_INVALID;
2944 }
2945 goto free_error;
2946 }
2947
6dc3064a
DG
2948 rcu_read_lock();
2949 snapshot_add_output(&session->snapshot, new_output);
2950 if (id) {
2951 *id = new_output->id;
2952 }
2953 rcu_read_unlock();
2954
2955 return LTTNG_OK;
2956
2957free_error:
2958 snapshot_output_destroy(new_output);
2959error:
2960 return ret;
2961}
2962
2963/*
2964 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2965 *
2966 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2967 */
2968int cmd_snapshot_del_output(struct ltt_session *session,
2969 struct lttng_snapshot_output *output)
2970{
2971 int ret;
eb240553 2972 struct snapshot_output *sout = NULL;
6dc3064a
DG
2973
2974 assert(session);
2975 assert(output);
2976
6dc3064a
DG
2977 rcu_read_lock();
2978
2979 /*
d3f14b8a
MD
2980 * Permission denied to create an output if the session is not
2981 * set in no output mode.
6dc3064a
DG
2982 */
2983 if (session->output_traces) {
2984 ret = LTTNG_ERR_EPERM;
2985 goto error;
2986 }
2987
eb240553
DG
2988 if (output->id) {
2989 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2990 session->name);
2991 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2992 } else if (*output->name != '\0') {
2993 DBG("Cmd snapshot del output name %s for session %s", output->name,
2994 session->name);
2995 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2996 }
6dc3064a
DG
2997 if (!sout) {
2998 ret = LTTNG_ERR_INVALID;
2999 goto error;
3000 }
3001
3002 snapshot_delete_output(&session->snapshot, sout);
3003 snapshot_output_destroy(sout);
3004 ret = LTTNG_OK;
3005
3006error:
3007 rcu_read_unlock();
3008 return ret;
3009}
3010
3011/*
3012 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
3013 *
3014 * If no output is available, outputs is untouched and 0 is returned.
3015 *
3016 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
3017 */
3018ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
3019 struct lttng_snapshot_output **outputs)
3020{
3021 int ret, idx = 0;
b223ca94 3022 struct lttng_snapshot_output *list = NULL;
6dc3064a
DG
3023 struct lttng_ht_iter iter;
3024 struct snapshot_output *output;
3025
3026 assert(session);
3027 assert(outputs);
3028
3029 DBG("Cmd snapshot list outputs for session %s", session->name);
3030
3031 /*
d3f14b8a
MD
3032 * Permission denied to create an output if the session is not
3033 * set in no output mode.
6dc3064a
DG
3034 */
3035 if (session->output_traces) {
b223ca94 3036 ret = -LTTNG_ERR_EPERM;
6dc3064a
DG
3037 goto error;
3038 }
3039
3040 if (session->snapshot.nb_output == 0) {
3041 ret = 0;
3042 goto error;
3043 }
3044
3045 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
3046 if (!list) {
b223ca94 3047 ret = -LTTNG_ERR_NOMEM;
6dc3064a
DG
3048 goto error;
3049 }
3050
3051 /* Copy list from session to the new list object. */
b223ca94 3052 rcu_read_lock();
6dc3064a
DG
3053 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
3054 output, node.node) {
3055 assert(output->consumer);
3056 list[idx].id = output->id;
3057 list[idx].max_size = output->max_size;
3058 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
3059 if (output->consumer->type == CONSUMER_DST_LOCAL) {
3060 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
3061 sizeof(list[idx].ctrl_url));
3062 } else {
3063 /* Control URI. */
3064 ret = uri_to_str_url(&output->consumer->dst.net.control,
3065 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
3066 if (ret < 0) {
b223ca94
JG
3067 ret = -LTTNG_ERR_NOMEM;
3068 goto error;
6dc3064a
DG
3069 }
3070
3071 /* Data URI. */
3072 ret = uri_to_str_url(&output->consumer->dst.net.data,
3073 list[idx].data_url, sizeof(list[idx].data_url));
3074 if (ret < 0) {
b223ca94
JG
3075 ret = -LTTNG_ERR_NOMEM;
3076 goto error;
6dc3064a
DG
3077 }
3078 }
3079 idx++;
3080 }
3081
3082 *outputs = list;
b223ca94
JG
3083 list = NULL;
3084 ret = session->snapshot.nb_output;
6dc3064a 3085error:
b223ca94
JG
3086 free(list);
3087 rcu_read_unlock();
3088 return ret;
6dc3064a
DG
3089}
3090
3091/*
3092 * Send relayd sockets from snapshot output to consumer. Ignore request if the
3093 * snapshot output is *not* set with a remote destination.
3094 *
a934f4af 3095 * Return 0 on success or a LTTNG_ERR code.
6dc3064a
DG
3096 */
3097static int set_relayd_for_snapshot(struct consumer_output *consumer,
3098 struct snapshot_output *snap_output, struct ltt_session *session)
3099{
a934f4af 3100 int ret = LTTNG_OK;
6dc3064a
DG
3101 struct lttng_ht_iter iter;
3102 struct consumer_socket *socket;
3103
3104 assert(consumer);
3105 assert(snap_output);
3106 assert(session);
3107
3108 DBG2("Set relayd object from snapshot output");
3109
3110 /* Ignore if snapshot consumer output is not network. */
3111 if (snap_output->consumer->type != CONSUMER_DST_NET) {
3112 goto error;
3113 }
3114
3115 /*
3116 * For each consumer socket, create and send the relayd object of the
3117 * snapshot output.
3118 */
3119 rcu_read_lock();
5eecee74
DG
3120 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
3121 socket, node.node) {
6dc3064a 3122 ret = send_consumer_relayd_sockets(0, session->id,
d3e2ba59
JD
3123 snap_output->consumer, socket,
3124 session->name, session->hostname,
3125 session->live_timer);
a934f4af 3126 if (ret != LTTNG_OK) {
6dc3064a
DG
3127 rcu_read_unlock();
3128 goto error;
3129 }
3130 }
3131 rcu_read_unlock();
3132
3133error:
3134 return ret;
3135}
3136
3137/*
3138 * Record a kernel snapshot.
3139 *
fac41e72 3140 * Return LTTNG_OK on success or a LTTNG_ERR code.
6dc3064a
DG
3141 */
3142static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
5c786ded 3143 struct snapshot_output *output, struct ltt_session *session,
d07ceecd 3144 int wait, uint64_t nb_packets_per_stream)
6dc3064a
DG
3145{
3146 int ret;
3147
3148 assert(ksess);
3149 assert(output);
3150 assert(session);
3151
10a50311
JD
3152 /* Get the datetime for the snapshot output directory. */
3153 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
3154 sizeof(output->datetime));
3155 if (!ret) {
a934f4af 3156 ret = LTTNG_ERR_INVALID;
10a50311
JD
3157 goto error;
3158 }
3159
af706bb7
DG
3160 /*
3161 * Copy kernel session sockets so we can communicate with the right
3162 * consumer for the snapshot record command.
3163 */
3164 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
3165 if (ret < 0) {
a934f4af 3166 ret = LTTNG_ERR_NOMEM;
af706bb7 3167 goto error;
6dc3064a
DG
3168 }
3169
3170 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
a934f4af 3171 if (ret != LTTNG_OK) {
af706bb7 3172 goto error_snapshot;
6dc3064a
DG
3173 }
3174
d07ceecd 3175 ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream);
2a06df8d 3176 if (ret != LTTNG_OK) {
af706bb7 3177 goto error_snapshot;
6dc3064a
DG
3178 }
3179
a934f4af 3180 ret = LTTNG_OK;
1371fc12 3181 goto end;
a934f4af 3182
af706bb7
DG
3183error_snapshot:
3184 /* Clean up copied sockets so this output can use some other later on. */
3185 consumer_destroy_output_sockets(output->consumer);
6dc3064a 3186error:
1371fc12 3187end:
6dc3064a
DG
3188 return ret;
3189}
3190
3191/*
3192 * Record a UST snapshot.
3193 *
a934f4af 3194 * Return 0 on success or a LTTNG_ERR error code.
6dc3064a
DG
3195 */
3196static int record_ust_snapshot(struct ltt_ust_session *usess,
5c786ded 3197 struct snapshot_output *output, struct ltt_session *session,
d07ceecd 3198 int wait, uint64_t nb_packets_per_stream)
6dc3064a
DG
3199{
3200 int ret;
3201
3202 assert(usess);
3203 assert(output);
3204 assert(session);
3205
10a50311
JD
3206 /* Get the datetime for the snapshot output directory. */
3207 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
3208 sizeof(output->datetime));
3209 if (!ret) {
a934f4af 3210 ret = LTTNG_ERR_INVALID;
10a50311
JD
3211 goto error;
3212 }
3213
af706bb7 3214 /*
d3f14b8a 3215 * Copy UST session sockets so we can communicate with the right
af706bb7
DG
3216 * consumer for the snapshot record command.
3217 */
3218 ret = consumer_copy_sockets(output->consumer, usess->consumer);
3219 if (ret < 0) {
a934f4af 3220 ret = LTTNG_ERR_NOMEM;
af706bb7 3221 goto error;
6dc3064a
DG
3222 }
3223
3224 ret = set_relayd_for_snapshot(usess->consumer, output, session);
a934f4af 3225 if (ret != LTTNG_OK) {
af706bb7 3226 goto error_snapshot;
6dc3064a
DG
3227 }
3228
d07ceecd 3229 ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream);
6dc3064a 3230 if (ret < 0) {
7badf927
DG
3231 switch (-ret) {
3232 case EINVAL:
a934f4af 3233 ret = LTTNG_ERR_INVALID;
7badf927
DG
3234 break;
3235 case ENODATA:
3236 ret = LTTNG_ERR_SNAPSHOT_NODATA;
3237 break;
3238 default:
3239 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3240 break;
5c786ded 3241 }
af706bb7 3242 goto error_snapshot;
6dc3064a
DG
3243 }
3244
a934f4af
DG
3245 ret = LTTNG_OK;
3246
af706bb7
DG
3247error_snapshot:
3248 /* Clean up copied sockets so this output can use some other later on. */
3249 consumer_destroy_output_sockets(output->consumer);
6dc3064a
DG
3250error:
3251 return ret;
3252}
3253
d07ceecd
MD
3254static
3255uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session,
3256 uint64_t cur_nr_packets)
68808f4e 3257{
d07ceecd 3258 uint64_t tot_size = 0;
68808f4e
DG
3259
3260 if (session->kernel_session) {
3261 struct ltt_kernel_channel *chan;
3262 struct ltt_kernel_session *ksess = session->kernel_session;
3263
68808f4e 3264 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
d07ceecd
MD
3265 if (cur_nr_packets >= chan->channel->attr.num_subbuf) {
3266 /*
3267 * Don't take channel into account if we
3268 * already grab all its packets.
3269 */
3270 continue;
68808f4e 3271 }
d07ceecd
MD
3272 tot_size += chan->channel->attr.subbuf_size
3273 * chan->stream_count;
68808f4e
DG
3274 }
3275 }
3276
3277 if (session->ust_session) {
68808f4e
DG
3278 struct ltt_ust_session *usess = session->ust_session;
3279
d07ceecd
MD
3280 tot_size += ust_app_get_size_one_more_packet_per_stream(usess,
3281 cur_nr_packets);
68808f4e
DG
3282 }
3283
d07ceecd 3284 return tot_size;
68808f4e
DG
3285}
3286
5c786ded 3287/*
d07ceecd
MD
3288 * Calculate the number of packets we can grab from each stream that
3289 * fits within the overall snapshot max size.
3290 *
3291 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
3292 * the number of packets per stream.
3293 *
3294 * TODO: this approach is not perfect: we consider the worse case
3295 * (packet filling the sub-buffers) as an upper bound, but we could do
3296 * better if we do this calculation while we actually grab the packet
3297 * content: we would know how much padding we don't actually store into
3298 * the file.
3299 *
3300 * This algorithm is currently bounded by the number of packets per
3301 * stream.
3302 *
3303 * Since we call this algorithm before actually grabbing the data, it's
3304 * an approximation: for instance, applications could appear/disappear
3305 * in between this call and actually grabbing data.
5c786ded 3306 */
d07ceecd
MD
3307static
3308int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size)
5c786ded 3309{
d07ceecd
MD
3310 int64_t size_left;
3311 uint64_t cur_nb_packets = 0;
5c786ded 3312
d07ceecd
MD
3313 if (!max_size) {
3314 return 0; /* Infinite */
5c786ded
JD
3315 }
3316
d07ceecd
MD
3317 size_left = max_size;
3318 for (;;) {
3319 uint64_t one_more_packet_tot_size;
5c786ded 3320
d07ceecd
MD
3321 one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session,
3322 cur_nb_packets);
3323 if (!one_more_packet_tot_size) {
3324 /* We are already grabbing all packets. */
3325 break;
3326 }
3327 size_left -= one_more_packet_tot_size;
3328 if (size_left < 0) {
3329 break;
3330 }
3331 cur_nb_packets++;
5c786ded 3332 }
d07ceecd
MD
3333 if (!cur_nb_packets) {
3334 /* Not enough room to grab one packet of each stream, error. */
3335 return -1;
3336 }
3337 return cur_nb_packets;
5c786ded
JD
3338}
3339
6dc3064a
DG
3340/*
3341 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3342 *
3343 * The wait parameter is ignored so this call always wait for the snapshot to
3344 * complete before returning.
3345 *
3346 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3347 */
3348int cmd_snapshot_record(struct ltt_session *session,
3349 struct lttng_snapshot_output *output, int wait)
3350{
3351 int ret = LTTNG_OK;
e1986656
DG
3352 unsigned int use_tmp_output = 0;
3353 struct snapshot_output tmp_output;
00e1dfc4 3354 unsigned int snapshot_success = 0;
6dc3064a
DG
3355
3356 assert(session);
ba45d9f0 3357 assert(output);
6dc3064a
DG
3358
3359 DBG("Cmd snapshot record for session %s", session->name);
3360
3361 /*
d3f14b8a
MD
3362 * Permission denied to create an output if the session is not
3363 * set in no output mode.
6dc3064a
DG
3364 */
3365 if (session->output_traces) {
3366 ret = LTTNG_ERR_EPERM;
3367 goto error;
3368 }
3369
3370 /* The session needs to be started at least once. */
8382cf6f 3371 if (!session->has_been_started) {
6dc3064a
DG
3372 ret = LTTNG_ERR_START_SESSION_ONCE;
3373 goto error;
3374 }
3375
3376 /* Use temporary output for the session. */
ba45d9f0 3377 if (*output->ctrl_url != '\0') {
6dc3064a
DG
3378 ret = snapshot_output_init(output->max_size, output->name,
3379 output->ctrl_url, output->data_url, session->consumer,
e1986656 3380 &tmp_output, NULL);
6dc3064a
DG
3381 if (ret < 0) {
3382 if (ret == -ENOMEM) {
3383 ret = LTTNG_ERR_NOMEM;
3384 } else {
3385 ret = LTTNG_ERR_INVALID;
3386 }
3387 goto error;
3388 }
1bfe7328
DG