Save filter expressions as part of agent events
[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;
ff94328f
DG
240 tmp_events[i].loglevel = event->loglevel;
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;
383
384 switch (event->event->instrumentation) {
385 case LTTNG_KERNEL_TRACEPOINT:
386 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
387 break;
2f77fc4b 388 case LTTNG_KERNEL_KRETPROBE:
1896972b
DG
389 (*events)[i].type = LTTNG_EVENT_FUNCTION;
390 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
391 sizeof(struct lttng_kernel_kprobe));
392 break;
393 case LTTNG_KERNEL_KPROBE:
2f77fc4b
DG
394 (*events)[i].type = LTTNG_EVENT_PROBE;
395 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
396 sizeof(struct lttng_kernel_kprobe));
397 break;
398 case LTTNG_KERNEL_FUNCTION:
399 (*events)[i].type = LTTNG_EVENT_FUNCTION;
400 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
401 sizeof(struct lttng_kernel_function));
402 break;
403 case LTTNG_KERNEL_NOOP:
404 (*events)[i].type = LTTNG_EVENT_NOOP;
405 break;
406 case LTTNG_KERNEL_SYSCALL:
407 (*events)[i].type = LTTNG_EVENT_SYSCALL;
408 break;
409 case LTTNG_KERNEL_ALL:
410 assert(0);
411 break;
412 }
413 i++;
414 }
415
834978fd
DG
416syscall:
417 if (syscall_table) {
418 ssize_t new_size;
419
420 new_size = syscall_list_channel(kchan, events, nb_event);
421 if (new_size < 0) {
422 free(events);
423 ret = -new_size;
424 goto error;
425 }
426 nb_event = new_size;
427 }
428
2f77fc4b
DG
429 return nb_event;
430
431error:
f73fabfd
DG
432 /* Negate the error code to differentiate the size from an error */
433 return -ret;
2f77fc4b
DG
434}
435
436/*
437 * Add URI so the consumer output object. Set the correct path depending on the
438 * domain adding the default trace directory.
439 */
440static int add_uri_to_consumer(struct consumer_output *consumer,
56a37563
JG
441 struct lttng_uri *uri, enum lttng_domain_type domain,
442 const char *session_name)
2f77fc4b 443{
f73fabfd 444 int ret = LTTNG_OK;
2f77fc4b
DG
445 const char *default_trace_dir;
446
447 assert(uri);
448
449 if (consumer == NULL) {
450 DBG("No consumer detected. Don't add URI. Stopping.");
f73fabfd 451 ret = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
452 goto error;
453 }
454
455 switch (domain) {
456 case LTTNG_DOMAIN_KERNEL:
457 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
458 break;
459 case LTTNG_DOMAIN_UST:
460 default_trace_dir = DEFAULT_UST_TRACE_DIR;
461 break;
462 default:
463 /*
464 * This case is possible is we try to add the URI to the global tracing
465 * session consumer object which in this case there is no subdir.
466 */
467 default_trace_dir = "";
468 }
469
470 switch (uri->dtype) {
471 case LTTNG_DST_IPV4:
472 case LTTNG_DST_IPV6:
473 DBG2("Setting network URI to consumer");
474
df75acac
DG
475 if (consumer->type == CONSUMER_DST_NET) {
476 if ((uri->stype == LTTNG_STREAM_CONTROL &&
785d2d0d
DG
477 consumer->dst.net.control_isset) ||
478 (uri->stype == LTTNG_STREAM_DATA &&
479 consumer->dst.net.data_isset)) {
df75acac
DG
480 ret = LTTNG_ERR_URL_EXIST;
481 goto error;
482 }
483 } else {
484 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
785d2d0d
DG
485 }
486
df75acac
DG
487 consumer->type = CONSUMER_DST_NET;
488
2f77fc4b
DG
489 /* Set URI into consumer output object */
490 ret = consumer_set_network_uri(consumer, uri);
491 if (ret < 0) {
a74934ba 492 ret = -ret;
2f77fc4b
DG
493 goto error;
494 } else if (ret == 1) {
495 /*
496 * URI was the same in the consumer so we do not append the subdir
497 * again so to not duplicate output dir.
498 */
f86c9f4e 499 ret = LTTNG_OK;
2f77fc4b
DG
500 goto error;
501 }
502
503 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
504 ret = consumer_set_subdir(consumer, session_name);
505 if (ret < 0) {
f73fabfd 506 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
507 goto error;
508 }
509 }
510
511 if (uri->stype == LTTNG_STREAM_CONTROL) {
512 /* On a new subdir, reappend the default trace dir. */
c30ce0b3
CB
513 strncat(consumer->subdir, default_trace_dir,
514 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2f77fc4b
DG
515 DBG3("Append domain trace name to subdir %s", consumer->subdir);
516 }
517
518 break;
519 case LTTNG_DST_PATH:
520 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
521 memset(consumer->dst.trace_path, 0,
522 sizeof(consumer->dst.trace_path));
523 strncpy(consumer->dst.trace_path, uri->dst.path,
524 sizeof(consumer->dst.trace_path));
525 /* Append default trace dir */
526 strncat(consumer->dst.trace_path, default_trace_dir,
c30ce0b3
CB
527 sizeof(consumer->dst.trace_path) -
528 strlen(consumer->dst.trace_path) - 1);
2f77fc4b
DG
529 /* Flag consumer as local. */
530 consumer->type = CONSUMER_DST_LOCAL;
531 break;
532 }
533
a74934ba
DG
534 ret = LTTNG_OK;
535
2f77fc4b
DG
536error:
537 return ret;
538}
539
540/*
541 * Init tracing by creating trace directory and sending fds kernel consumer.
542 */
543static int init_kernel_tracing(struct ltt_kernel_session *session)
544{
545 int ret = 0;
546 struct lttng_ht_iter iter;
547 struct consumer_socket *socket;
548
549 assert(session);
550
e7fe706f
DG
551 rcu_read_lock();
552
2f77fc4b
DG
553 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
554 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
555 socket, node.node) {
2f77fc4b 556 pthread_mutex_lock(socket->lock);
f50f23d9 557 ret = kernel_consumer_send_session(socket, session);
2f77fc4b
DG
558 pthread_mutex_unlock(socket->lock);
559 if (ret < 0) {
f73fabfd 560 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
561 goto error;
562 }
563 }
564 }
565
566error:
e7fe706f 567 rcu_read_unlock();
2f77fc4b
DG
568 return ret;
569}
570
571/*
572 * Create a socket to the relayd using the URI.
573 *
574 * On success, the relayd_sock pointer is set to the created socket.
575 * Else, it's stays untouched and a lttcomm error code is returned.
576 */
6151a90f
JD
577static int create_connect_relayd(struct lttng_uri *uri,
578 struct lttcomm_relayd_sock **relayd_sock)
2f77fc4b
DG
579{
580 int ret;
6151a90f 581 struct lttcomm_relayd_sock *rsock;
2f77fc4b 582
6151a90f
JD
583 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
584 RELAYD_VERSION_COMM_MINOR);
585 if (!rsock) {
f73fabfd 586 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
587 goto error;
588 }
589
ffe60014
DG
590 /*
591 * Connect to relayd so we can proceed with a session creation. This call
592 * can possibly block for an arbitrary amount of time to set the health
593 * state to be in poll execution.
594 */
595 health_poll_entry();
6151a90f 596 ret = relayd_connect(rsock);
ffe60014 597 health_poll_exit();
2f77fc4b
DG
598 if (ret < 0) {
599 ERR("Unable to reach lttng-relayd");
f73fabfd 600 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG
601 goto free_sock;
602 }
603
604 /* Create socket for control stream. */
605 if (uri->stype == LTTNG_STREAM_CONTROL) {
606 DBG3("Creating relayd stream socket from URI");
607
608 /* Check relayd version */
6151a90f 609 ret = relayd_version_check(rsock);
2f77fc4b 610 if (ret < 0) {
f73fabfd 611 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
2f77fc4b
DG
612 goto close_sock;
613 }
614 } else if (uri->stype == LTTNG_STREAM_DATA) {
615 DBG3("Creating relayd data socket from URI");
616 } else {
617 /* Command is not valid */
618 ERR("Relayd invalid stream type: %d", uri->stype);
f73fabfd 619 ret = LTTNG_ERR_INVALID;
2f77fc4b
DG
620 goto close_sock;
621 }
622
6151a90f 623 *relayd_sock = rsock;
2f77fc4b 624
f73fabfd 625 return LTTNG_OK;
2f77fc4b
DG
626
627close_sock:
6151a90f
JD
628 /* The returned value is not useful since we are on an error path. */
629 (void) relayd_close(rsock);
2f77fc4b 630free_sock:
6151a90f 631 free(rsock);
2f77fc4b
DG
632error:
633 return ret;
634}
635
636/*
637 * Connect to the relayd using URI and send the socket to the right consumer.
638 */
56a37563
JG
639static int send_consumer_relayd_socket(enum lttng_domain_type domain,
640 unsigned int session_id, struct lttng_uri *relayd_uri,
641 struct consumer_output *consumer,
d3e2ba59
JD
642 struct consumer_socket *consumer_sock,
643 char *session_name, char *hostname, int session_live_timer)
2f77fc4b
DG
644{
645 int ret;
6151a90f 646 struct lttcomm_relayd_sock *rsock = NULL;
2f77fc4b 647
ffe60014 648 /* Connect to relayd and make version check if uri is the control. */
6151a90f 649 ret = create_connect_relayd(relayd_uri, &rsock);
ffe60014 650 if (ret != LTTNG_OK) {
6151a90f 651 goto error;
ffe60014 652 }
6151a90f 653 assert(rsock);
ffe60014 654
2f77fc4b 655 /* Set the network sequence index if not set. */
d88aee68
DG
656 if (consumer->net_seq_index == (uint64_t) -1ULL) {
657 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
658 /*
659 * Increment net_seq_idx because we are about to transfer the
660 * new relayd socket to the consumer.
d88aee68 661 * Assign unique key so the consumer can match streams.
2f77fc4b 662 */
d88aee68
DG
663 consumer->net_seq_index = ++relayd_net_seq_idx;
664 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
665 }
666
2f77fc4b 667 /* Send relayd socket to consumer. */
6151a90f 668 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
d3e2ba59
JD
669 relayd_uri->stype, session_id,
670 session_name, hostname, session_live_timer);
2f77fc4b 671 if (ret < 0) {
f73fabfd 672 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
673 goto close_sock;
674 }
675
c890b720
DG
676 /* Flag that the corresponding socket was sent. */
677 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
ffe60014 678 consumer_sock->control_sock_sent = 1;
c890b720 679 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
ffe60014 680 consumer_sock->data_sock_sent = 1;
c890b720
DG
681 }
682
f73fabfd 683 ret = LTTNG_OK;
2f77fc4b
DG
684
685 /*
686 * Close socket which was dup on the consumer side. The session daemon does
687 * NOT keep track of the relayd socket(s) once transfer to the consumer.
688 */
689
690close_sock:
6151a90f
JD
691 (void) relayd_close(rsock);
692 free(rsock);
2f77fc4b 693
6151a90f 694error:
ffe60014
DG
695 if (ret != LTTNG_OK) {
696 /*
d9078d0c
DG
697 * The consumer output for this session should not be used anymore
698 * since the relayd connection failed thus making any tracing or/and
699 * streaming not usable.
ffe60014 700 */
d9078d0c 701 consumer->enabled = 0;
ffe60014 702 }
2f77fc4b
DG
703 return ret;
704}
705
706/*
707 * Send both relayd sockets to a specific consumer and domain. This is a
708 * helper function to facilitate sending the information to the consumer for a
709 * session.
710 */
56a37563
JG
711static int send_consumer_relayd_sockets(enum lttng_domain_type domain,
712 unsigned int session_id, struct consumer_output *consumer,
713 struct consumer_socket *sock, char *session_name,
714 char *hostname, int session_live_timer)
2f77fc4b 715{
dda67f6c 716 int ret = LTTNG_OK;
2f77fc4b 717
2f77fc4b 718 assert(consumer);
6dc3064a 719 assert(sock);
2f77fc4b 720
2f77fc4b 721 /* Sending control relayd socket. */
ffe60014 722 if (!sock->control_sock_sent) {
6dc3064a 723 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD
724 &consumer->dst.net.control, consumer, sock,
725 session_name, hostname, session_live_timer);
c890b720
DG
726 if (ret != LTTNG_OK) {
727 goto error;
728 }
2f77fc4b
DG
729 }
730
731 /* Sending data relayd socket. */
ffe60014 732 if (!sock->data_sock_sent) {
6dc3064a 733 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD
734 &consumer->dst.net.data, consumer, sock,
735 session_name, hostname, session_live_timer);
c890b720
DG
736 if (ret != LTTNG_OK) {
737 goto error;
738 }
2f77fc4b
DG
739 }
740
2f77fc4b
DG
741error:
742 return ret;
743}
744
745/*
746 * Setup relayd connections for a tracing session. First creates the socket to
747 * the relayd and send them to the right domain consumer. Consumer type MUST be
748 * network.
749 */
ffe60014 750int cmd_setup_relayd(struct ltt_session *session)
2f77fc4b 751{
f73fabfd 752 int ret = LTTNG_OK;
2f77fc4b
DG
753 struct ltt_ust_session *usess;
754 struct ltt_kernel_session *ksess;
755 struct consumer_socket *socket;
756 struct lttng_ht_iter iter;
757
758 assert(session);
759
760 usess = session->ust_session;
761 ksess = session->kernel_session;
762
785d2d0d 763 DBG("Setting relayd for session %s", session->name);
2f77fc4b 764
e7fe706f
DG
765 rcu_read_lock();
766
2f77fc4b
DG
767 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
768 && usess->consumer->enabled) {
769 /* For each consumer socket, send relayd sockets */
770 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
771 socket, node.node) {
2f77fc4b 772 pthread_mutex_lock(socket->lock);
6dc3064a 773 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
d3e2ba59
JD
774 usess->consumer, socket,
775 session->name, session->hostname,
776 session->live_timer);
2f77fc4b 777 pthread_mutex_unlock(socket->lock);
f73fabfd 778 if (ret != LTTNG_OK) {
2f77fc4b
DG
779 goto error;
780 }
6dc3064a
DG
781 /* Session is now ready for network streaming. */
782 session->net_handle = 1;
2f77fc4b
DG
783 }
784 }
785
786 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
787 && ksess->consumer->enabled) {
788 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
789 socket, node.node) {
2f77fc4b 790 pthread_mutex_lock(socket->lock);
6dc3064a 791 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
d3e2ba59
JD
792 ksess->consumer, socket,
793 session->name, session->hostname,
794 session->live_timer);
2f77fc4b 795 pthread_mutex_unlock(socket->lock);
f73fabfd 796 if (ret != LTTNG_OK) {
2f77fc4b
DG
797 goto error;
798 }
6dc3064a
DG
799 /* Session is now ready for network streaming. */
800 session->net_handle = 1;
2f77fc4b
DG
801 }
802 }
803
804error:
e7fe706f 805 rcu_read_unlock();
2f77fc4b
DG
806 return ret;
807}
808
9b6c7ec5
DG
809/*
810 * Start a kernel session by opening all necessary streams.
811 */
812static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
813{
814 int ret;
815 struct ltt_kernel_channel *kchan;
816
817 /* Open kernel metadata */
07b86b52 818 if (ksess->metadata == NULL && ksess->output_traces) {
9b6c7ec5
DG
819 ret = kernel_open_metadata(ksess);
820 if (ret < 0) {
821 ret = LTTNG_ERR_KERN_META_FAIL;
822 goto error;
823 }
824 }
825
826 /* Open kernel metadata stream */
07b86b52 827 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
9b6c7ec5
DG
828 ret = kernel_open_metadata_stream(ksess);
829 if (ret < 0) {
830 ERR("Kernel create metadata stream failed");
831 ret = LTTNG_ERR_KERN_STREAM_FAIL;
832 goto error;
833 }
834 }
835
836 /* For each channel */
837 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
838 if (kchan->stream_count == 0) {
839 ret = kernel_open_channel_stream(kchan);
840 if (ret < 0) {
841 ret = LTTNG_ERR_KERN_STREAM_FAIL;
842 goto error;
843 }
844 /* Update the stream global counter */
845 ksess->stream_count_global += ret;
846 }
847 }
848
849 /* Setup kernel consumer socket and send fds to it */
850 ret = init_kernel_tracing(ksess);
e43c41c5 851 if (ret != 0) {
9b6c7ec5
DG
852 ret = LTTNG_ERR_KERN_START_FAIL;
853 goto error;
854 }
855
856 /* This start the kernel tracing */
857 ret = kernel_start_session(ksess);
858 if (ret < 0) {
859 ret = LTTNG_ERR_KERN_START_FAIL;
860 goto error;
861 }
862
863 /* Quiescent wait after starting trace */
784303b0 864 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5 865
14fb1ebe 866 ksess->active = 1;
9b6c7ec5
DG
867
868 ret = LTTNG_OK;
869
870error:
871 return ret;
872}
873
2f77fc4b
DG
874/*
875 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
876 */
56a37563
JG
877int cmd_disable_channel(struct ltt_session *session,
878 enum lttng_domain_type domain, char *channel_name)
2f77fc4b
DG
879{
880 int ret;
881 struct ltt_ust_session *usess;
882
883 usess = session->ust_session;
884
2223c96f
DG
885 rcu_read_lock();
886
2f77fc4b
DG
887 switch (domain) {
888 case LTTNG_DOMAIN_KERNEL:
889 {
890 ret = channel_kernel_disable(session->kernel_session,
891 channel_name);
f73fabfd 892 if (ret != LTTNG_OK) {
2f77fc4b
DG
893 goto error;
894 }
895
896 kernel_wait_quiescent(kernel_tracer_fd);
897 break;
898 }
899 case LTTNG_DOMAIN_UST:
900 {
901 struct ltt_ust_channel *uchan;
902 struct lttng_ht *chan_ht;
903
904 chan_ht = usess->domain_global.channels;
905
906 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
907 if (uchan == NULL) {
f73fabfd 908 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
909 goto error;
910 }
911
7972aab2 912 ret = channel_ust_disable(usess, uchan);
f73fabfd 913 if (ret != LTTNG_OK) {
2f77fc4b
DG
914 goto error;
915 }
916 break;
917 }
2f77fc4b 918 default:
f73fabfd 919 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
920 goto error;
921 }
922
f73fabfd 923 ret = LTTNG_OK;
2f77fc4b
DG
924
925error:
2223c96f 926 rcu_read_unlock();
2f77fc4b
DG
927 return ret;
928}
929
ccf10263
MD
930/*
931 * Command LTTNG_TRACK_PID processed by the client thread.
a9ad0c8f
MD
932 *
933 * Called with session lock held.
ccf10263 934 */
56a37563
JG
935int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain,
936 int pid)
ccf10263
MD
937{
938 int ret;
939
940 rcu_read_lock();
941
942 switch (domain) {
943 case LTTNG_DOMAIN_KERNEL:
944 {
945 struct ltt_kernel_session *ksess;
946
947 ksess = session->kernel_session;
948
949 ret = kernel_track_pid(ksess, pid);
950 if (ret != LTTNG_OK) {
951 goto error;
952 }
953
954 kernel_wait_quiescent(kernel_tracer_fd);
955 break;
956 }
ccf10263 957 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
958 {
959 struct ltt_ust_session *usess;
960
961 usess = session->ust_session;
962
963 ret = trace_ust_track_pid(usess, pid);
964 if (ret != LTTNG_OK) {
965 goto error;
966 }
967 break;
968 }
ccf10263
MD
969 default:
970 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
971 goto error;
972 }
973
974 ret = LTTNG_OK;
975
976error:
977 rcu_read_unlock();
978 return ret;
979}
980
981/*
982 * Command LTTNG_UNTRACK_PID processed by the client thread.
a9ad0c8f
MD
983 *
984 * Called with session lock held.
ccf10263 985 */
56a37563
JG
986int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain,
987 int pid)
ccf10263
MD
988{
989 int ret;
990
991 rcu_read_lock();
992
993 switch (domain) {
994 case LTTNG_DOMAIN_KERNEL:
995 {
996 struct ltt_kernel_session *ksess;
997
998 ksess = session->kernel_session;
999
1000 ret = kernel_untrack_pid(ksess, pid);
1001 if (ret != LTTNG_OK) {
1002 goto error;
1003 }
1004
1005 kernel_wait_quiescent(kernel_tracer_fd);
1006 break;
1007 }
ccf10263 1008 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD
1009 {
1010 struct ltt_ust_session *usess;
1011
1012 usess = session->ust_session;
1013
1014 ret = trace_ust_untrack_pid(usess, pid);
1015 if (ret != LTTNG_OK) {
1016 goto error;
1017 }
1018 break;
1019 }
ccf10263
MD
1020 default:
1021 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1022 goto error;
1023 }
1024
1025 ret = LTTNG_OK;
1026
1027error:
1028 rcu_read_unlock();
1029 return ret;
1030}
1031
2f77fc4b
DG
1032/*
1033 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1034 *
1035 * The wpipe arguments is used as a notifier for the kernel thread.
1036 */
1037int cmd_enable_channel(struct ltt_session *session,
7972aab2 1038 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
2f77fc4b
DG
1039{
1040 int ret;
1041 struct ltt_ust_session *usess = session->ust_session;
1042 struct lttng_ht *chan_ht;
1f345e94 1043 size_t len;
2f77fc4b
DG
1044
1045 assert(session);
1046 assert(attr);
7972aab2 1047 assert(domain);
2f77fc4b 1048
1f345e94
PP
1049 len = strnlen(attr->name, sizeof(attr->name));
1050
1051 /* Validate channel name */
1052 if (attr->name[0] == '.' ||
1053 memchr(attr->name, '/', len) != NULL) {
1054 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1055 goto end;
1056 }
1057
2f77fc4b
DG
1058 DBG("Enabling channel %s for session %s", attr->name, session->name);
1059
03b4fdcf
DG
1060 rcu_read_lock();
1061
ecc48a90
JD
1062 /*
1063 * Don't try to enable a channel if the session has been started at
1064 * some point in time before. The tracer does not allow it.
1065 */
8382cf6f 1066 if (session->has_been_started) {
ecc48a90
JD
1067 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1068 goto error;
1069 }
1070
1071 /*
1072 * If the session is a live session, remove the switch timer, the
1073 * live timer does the same thing but sends also synchronisation
1074 * beacons for inactive streams.
1075 */
1076 if (session->live_timer > 0) {
1077 attr->attr.live_timer_interval = session->live_timer;
1078 attr->attr.switch_timer_interval = 0;
1079 }
1080
33fbd469
DG
1081 /*
1082 * The ringbuffer (both in user space and kernel) behave badly in overwrite
1083 * mode and with less than 2 subbuf so block it right away and send back an
1084 * invalid attribute error.
1085 */
1086 if (attr->attr.overwrite && attr->attr.num_subbuf < 2) {
1087 ret = LTTNG_ERR_INVALID;
1088 goto error;
1089 }
1090
7972aab2 1091 switch (domain->type) {
2f77fc4b
DG
1092 case LTTNG_DOMAIN_KERNEL:
1093 {
1094 struct ltt_kernel_channel *kchan;
1095
2f77fc4b
DG
1096 kchan = trace_kernel_get_channel_by_name(attr->name,
1097 session->kernel_session);
1098 if (kchan == NULL) {
1099 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
85076754
MD
1100 if (attr->name[0] != '\0') {
1101 session->kernel_session->has_non_default_channel = 1;
1102 }
2f77fc4b
DG
1103 } else {
1104 ret = channel_kernel_enable(session->kernel_session, kchan);
1105 }
1106
f73fabfd 1107 if (ret != LTTNG_OK) {
2f77fc4b
DG
1108 goto error;
1109 }
1110
784303b0 1111 kernel_wait_quiescent(kernel_tracer_fd);
2f77fc4b
DG
1112 break;
1113 }
1114 case LTTNG_DOMAIN_UST:
1115 {
1116 struct ltt_ust_channel *uchan;
1117
1118 chan_ht = usess->domain_global.channels;
1119
1120 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1121 if (uchan == NULL) {
7972aab2 1122 ret = channel_ust_create(usess, attr, domain->buf_type);
85076754
MD
1123 if (attr->name[0] != '\0') {
1124 usess->has_non_default_channel = 1;
1125 }
2f77fc4b 1126 } else {
7972aab2 1127 ret = channel_ust_enable(usess, uchan);
2f77fc4b
DG
1128 }
1129 break;
1130 }
2f77fc4b 1131 default:
f73fabfd 1132 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1133 goto error;
1134 }
1135
1136error:
2223c96f 1137 rcu_read_unlock();
1f345e94 1138end:
2f77fc4b
DG
1139 return ret;
1140}
1141
2f77fc4b
DG
1142/*
1143 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1144 */
56a37563
JG
1145int cmd_disable_event(struct ltt_session *session,
1146 enum lttng_domain_type domain, char *channel_name,
6e911cad 1147 struct lttng_event *event)
2f77fc4b
DG
1148{
1149 int ret;
6e911cad
MD
1150 char *event_name;
1151
18a720cd
MD
1152 DBG("Disable event command for event \'%s\'", event->name);
1153
6e911cad 1154 event_name = event->name;
7076b56e
JG
1155 if (validate_event_name(event_name)) {
1156 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1157 goto error;
1158 }
6e911cad 1159
9b7431cf
JG
1160 /* Error out on unhandled search criteria */
1161 if (event->loglevel_type || event->loglevel != -1 || event->enabled
6e911cad 1162 || event->pid || event->filter || event->exclusion) {
7076b56e
JG
1163 ret = LTTNG_ERR_UNK;
1164 goto error;
6e911cad 1165 }
2f77fc4b 1166
2223c96f
DG
1167 rcu_read_lock();
1168
2f77fc4b
DG
1169 switch (domain) {
1170 case LTTNG_DOMAIN_KERNEL:
1171 {
1172 struct ltt_kernel_channel *kchan;
1173 struct ltt_kernel_session *ksess;
1174
1175 ksess = session->kernel_session;
1176
85076754
MD
1177 /*
1178 * If a non-default channel has been created in the
1179 * session, explicitely require that -c chan_name needs
1180 * to be provided.
1181 */
1182 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1183 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1184 goto error_unlock;
85076754
MD
1185 }
1186
2f77fc4b
DG
1187 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1188 if (kchan == NULL) {
f73fabfd 1189 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
7076b56e 1190 goto error_unlock;
2f77fc4b
DG
1191 }
1192
6e911cad
MD
1193 switch (event->type) {
1194 case LTTNG_EVENT_ALL:
d0ae4ea8 1195 ret = event_kernel_disable_event_all(kchan);
29c62722 1196 if (ret != LTTNG_OK) {
7076b56e 1197 goto error_unlock;
29c62722
MD
1198 }
1199 break;
d0ae4ea8
MD
1200 case LTTNG_EVENT_TRACEPOINT: /* fall-through */
1201 case LTTNG_EVENT_SYSCALL:
29c62722 1202 if (!strcmp(event_name, "*")) {
d0ae4ea8
MD
1203 ret = event_kernel_disable_event_type(kchan,
1204 event->type);
29c62722 1205 } else {
d0ae4ea8
MD
1206 ret = event_kernel_disable_event(kchan,
1207 event_name);
29c62722 1208 }
6e911cad 1209 if (ret != LTTNG_OK) {
7076b56e 1210 goto error_unlock;
6e911cad
MD
1211 }
1212 break;
d0ae4ea8
MD
1213 case LTTNG_EVENT_PROBE:
1214 case LTTNG_EVENT_FUNCTION:
1215 case LTTNG_EVENT_FUNCTION_ENTRY:
1216 ret = event_kernel_disable_event(kchan, event_name);
e2b957af 1217 if (ret != LTTNG_OK) {
7076b56e 1218 goto error_unlock;
e2b957af 1219 }
6e911cad
MD
1220 break;
1221 default:
1222 ret = LTTNG_ERR_UNK;
7076b56e 1223 goto error_unlock;
2f77fc4b
DG
1224 }
1225
1226 kernel_wait_quiescent(kernel_tracer_fd);
1227 break;
1228 }
1229 case LTTNG_DOMAIN_UST:
1230 {
1231 struct ltt_ust_channel *uchan;
1232 struct ltt_ust_session *usess;
1233
1234 usess = session->ust_session;
1235
7076b56e
JG
1236 if (validate_ust_event_name(event_name)) {
1237 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1238 goto error_unlock;
1239 }
1240
85076754
MD
1241 /*
1242 * If a non-default channel has been created in the
1243 * session, explicitely require that -c chan_name needs
1244 * to be provided.
1245 */
1246 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1247 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1248 goto error_unlock;
85076754
MD
1249 }
1250
2f77fc4b
DG
1251 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1252 channel_name);
1253 if (uchan == NULL) {
f73fabfd 1254 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
7076b56e 1255 goto error_unlock;
2f77fc4b
DG
1256 }
1257
6e911cad
MD
1258 switch (event->type) {
1259 case LTTNG_EVENT_ALL:
1260 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
1261 if (ret != LTTNG_OK) {
7076b56e 1262 goto error_unlock;
6e911cad
MD
1263 }
1264 break;
1265 default:
1266 ret = LTTNG_ERR_UNK;
7076b56e 1267 goto error_unlock;
2f77fc4b
DG
1268 }
1269
1270 DBG3("Disable UST event %s in channel %s completed", event_name,
1271 channel_name);
1272 break;
1273 }
5cdb6027 1274 case LTTNG_DOMAIN_LOG4J:
f20baf8e 1275 case LTTNG_DOMAIN_JUL:
0e115563 1276 case LTTNG_DOMAIN_PYTHON:
f20baf8e 1277 {
fefd409b 1278 struct agent *agt;
f20baf8e
DG
1279 struct ltt_ust_session *usess = session->ust_session;
1280
1281 assert(usess);
1282
6e911cad
MD
1283 switch (event->type) {
1284 case LTTNG_EVENT_ALL:
1285 break;
1286 default:
1287 ret = LTTNG_ERR_UNK;
7076b56e 1288 goto error_unlock;
6e911cad
MD
1289 }
1290
5cdb6027 1291 agt = trace_ust_find_agent(usess, domain);
fefd409b
DG
1292 if (!agt) {
1293 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
7076b56e 1294 goto error_unlock;
fefd409b 1295 }
18a720cd
MD
1296 /* The wild card * means that everything should be disabled. */
1297 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1298 ret = event_agent_disable_all(usess, agt);
1299 } else {
1300 ret = event_agent_disable(usess, agt, event_name);
1301 }
f20baf8e 1302 if (ret != LTTNG_OK) {
7076b56e 1303 goto error_unlock;
f20baf8e
DG
1304 }
1305
1306 break;
1307 }
2f77fc4b 1308 default:
f73fabfd 1309 ret = LTTNG_ERR_UND;
7076b56e 1310 goto error_unlock;
2f77fc4b
DG
1311 }
1312
f73fabfd 1313 ret = LTTNG_OK;
2f77fc4b 1314
7076b56e 1315error_unlock:
2223c96f 1316 rcu_read_unlock();
7076b56e 1317error:
2f77fc4b
DG
1318 return ret;
1319}
1320
2f77fc4b
DG
1321/*
1322 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1323 */
56a37563 1324int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain,
601d5acf 1325 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
2f77fc4b 1326{
d5979e4a 1327 int ret, chan_kern_created = 0, chan_ust_created = 0;
2f77fc4b
DG
1328
1329 switch (domain) {
1330 case LTTNG_DOMAIN_KERNEL:
979e618e
DG
1331 assert(session->kernel_session);
1332
1333 if (session->kernel_session->channel_count == 0) {
1334 /* Create default channel */
1335 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1336 if (ret != LTTNG_OK) {
1337 goto error;
1338 }
d5979e4a 1339 chan_kern_created = 1;
979e618e 1340 }
2f77fc4b 1341 /* Add kernel context to kernel tracer */
601d5acf 1342 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
f73fabfd 1343 if (ret != LTTNG_OK) {
2f77fc4b
DG
1344 goto error;
1345 }
1346 break;
1347 case LTTNG_DOMAIN_UST:
1348 {
1349 struct ltt_ust_session *usess = session->ust_session;
85076754
MD
1350 unsigned int chan_count;
1351
2f77fc4b
DG
1352 assert(usess);
1353
85076754 1354 chan_count = lttng_ht_get_count(usess->domain_global.channels);
979e618e
DG
1355 if (chan_count == 0) {
1356 struct lttng_channel *attr;
1357 /* Create default channel */
0a9c6494 1358 attr = channel_new_default_attr(domain, usess->buffer_type);
979e618e
DG
1359 if (attr == NULL) {
1360 ret = LTTNG_ERR_FATAL;
1361 goto error;
1362 }
1363
7972aab2 1364 ret = channel_ust_create(usess, attr, usess->buffer_type);
979e618e
DG
1365 if (ret != LTTNG_OK) {
1366 free(attr);
1367 goto error;
1368 }
1369 free(attr);
d5979e4a 1370 chan_ust_created = 1;
979e618e
DG
1371 }
1372
601d5acf 1373 ret = context_ust_add(usess, domain, ctx, channel_name);
f73fabfd 1374 if (ret != LTTNG_OK) {
2f77fc4b
DG
1375 goto error;
1376 }
1377 break;
1378 }
2f77fc4b 1379 default:
f73fabfd 1380 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1381 goto error;
1382 }
1383
d5979e4a 1384 return LTTNG_OK;
2f77fc4b
DG
1385
1386error:
d5979e4a
DG
1387 if (chan_kern_created) {
1388 struct ltt_kernel_channel *kchan =
1389 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1390 session->kernel_session);
1391 /* Created previously, this should NOT fail. */
1392 assert(kchan);
1393 kernel_destroy_channel(kchan);
1394 }
1395
1396 if (chan_ust_created) {
1397 struct ltt_ust_channel *uchan =
1398 trace_ust_find_channel_by_name(
1399 session->ust_session->domain_global.channels,
1400 DEFAULT_CHANNEL_NAME);
1401 /* Created previously, this should NOT fail. */
1402 assert(uchan);
1403 /* Remove from the channel list of the session. */
1404 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1405 uchan);
1406 trace_ust_destroy_channel(uchan);
1407 }
2f77fc4b
DG
1408 return ret;
1409}
1410
930a2e99
JG
1411static int validate_event_name(const char *name)
1412{
1413 int ret = 0;
1414 const char *c = name;
1415 const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN;
bf9807db 1416 bool null_terminated = false;
930a2e99
JG
1417
1418 /*
1419 * Make sure that unescaped wildcards are only used as the last
1420 * character of the event name.
1421 */
1422 while (c < event_name_end) {
1423 switch (*c) {
1424 case '\0':
bf9807db 1425 null_terminated = true;
930a2e99
JG
1426 goto end;
1427 case '\\':
1428 c++;
1429 break;
1430 case '*':
1431 if ((c + 1) < event_name_end && *(c + 1)) {
1432 /* Wildcard is not the last character */
1433 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1434 goto end;
1435 }
1436 default:
1437 break;
1438 }
1439 c++;
1440 }
1441end:
bf9807db
JG
1442 if (!ret && !null_terminated) {
1443 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1444 }
930a2e99
JG
1445 return ret;
1446}
1447
dac8e046
JG
1448static inline bool name_starts_with(const char *name, const char *prefix)
1449{
1450 const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
1451
1452 return !strncmp(name, prefix, max_cmp_len);
1453}
1454
1455/* Perform userspace-specific event name validation */
1456static int validate_ust_event_name(const char *name)
1457{
1458 int ret = 0;
1459
1460 if (!name) {
1461 ret = -1;
1462 goto end;
1463 }
1464
1465 /*
1466 * Check name against all internal UST event component namespaces used
1467 * by the agents.
1468 */
1469 if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) ||
1470 name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) ||
1471 name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) {
1472 ret = -1;
1473 }
1474
1475end:
1476 return ret;
1477}
88f06f15 1478
2f77fc4b 1479/*
88f06f15
JG
1480 * Internal version of cmd_enable_event() with a supplemental
1481 * "internal_event" flag which is used to enable internal events which should
1482 * be hidden from clients. Such events are used in the agent implementation to
1483 * enable the events through which all "agent" events are funeled.
2f77fc4b 1484 */
88f06f15
JG
1485static int _cmd_enable_event(struct ltt_session *session,
1486 struct lttng_domain *domain,
025faf73 1487 char *channel_name, struct lttng_event *event,
6b453b5e 1488 char *filter_expression,
db8f1377
JI
1489 struct lttng_filter_bytecode *filter,
1490 struct lttng_event_exclusion *exclusion,
88f06f15 1491 int wpipe, bool internal_event)
2f77fc4b 1492{
e5f5db7f 1493 int ret, channel_created = 0;
2f77fc4b
DG
1494 struct lttng_channel *attr;
1495
1496 assert(session);
1497 assert(event);
1498 assert(channel_name);
1499
18a720cd
MD
1500 DBG("Enable event command for event \'%s\'", event->name);
1501
930a2e99
JG
1502 ret = validate_event_name(event->name);
1503 if (ret) {
1504 goto error;
1505 }
1506
2223c96f
DG
1507 rcu_read_lock();
1508
7972aab2 1509 switch (domain->type) {
2f77fc4b
DG
1510 case LTTNG_DOMAIN_KERNEL:
1511 {
1512 struct ltt_kernel_channel *kchan;
1513
85076754
MD
1514 /*
1515 * If a non-default channel has been created in the
1516 * session, explicitely require that -c chan_name needs
1517 * to be provided.
1518 */
1519 if (session->kernel_session->has_non_default_channel
1520 && channel_name[0] == '\0') {
1521 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1522 goto error;
1523 }
1524
2f77fc4b
DG
1525 kchan = trace_kernel_get_channel_by_name(channel_name,
1526 session->kernel_session);
1527 if (kchan == NULL) {
0a9c6494
DG
1528 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1529 LTTNG_BUFFER_GLOBAL);
2f77fc4b 1530 if (attr == NULL) {
f73fabfd 1531 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1532 goto error;
1533 }
1534 strncpy(attr->name, channel_name, sizeof(attr->name));
1535
1536 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1537 if (ret != LTTNG_OK) {
2f77fc4b
DG
1538 free(attr);
1539 goto error;
1540 }
1541 free(attr);
e5f5db7f
DG
1542
1543 channel_created = 1;
2f77fc4b
DG
1544 }
1545
1546 /* Get the newly created kernel channel pointer */
1547 kchan = trace_kernel_get_channel_by_name(channel_name,
1548 session->kernel_session);
1549 if (kchan == NULL) {
1550 /* This sould not happen... */
f73fabfd 1551 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1552 goto error;
1553 }
1554
6e911cad
MD
1555 switch (event->type) {
1556 case LTTNG_EVENT_ALL:
29c62722 1557 {
00a62084
MD
1558 char *filter_expression_a = NULL;
1559 struct lttng_filter_bytecode *filter_a = NULL;
1560
1561 /*
1562 * We need to duplicate filter_expression and filter,
1563 * because ownership is passed to first enable
1564 * event.
1565 */
1566 if (filter_expression) {
1567 filter_expression_a = strdup(filter_expression);
1568 if (!filter_expression_a) {
1569 ret = LTTNG_ERR_FATAL;
1570 goto error;
1571 }
1572 }
1573 if (filter) {
1574 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
1575 if (!filter_a) {
1576 free(filter_expression_a);
1577 ret = LTTNG_ERR_FATAL;
1578 goto error;
1579 }
1580 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
1581 }
29c62722 1582 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
00a62084
MD
1583 ret = event_kernel_enable_event(kchan, event,
1584 filter_expression, filter);
a969e101
MD
1585 /* We have passed ownership */
1586 filter_expression = NULL;
1587 filter = NULL;
29c62722
MD
1588 if (ret != LTTNG_OK) {
1589 if (channel_created) {
1590 /* Let's not leak a useless channel. */
1591 kernel_destroy_channel(kchan);
1592 }
00a62084
MD
1593 free(filter_expression_a);
1594 free(filter_a);
29c62722
MD
1595 goto error;
1596 }
1597 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
00a62084
MD
1598 ret = event_kernel_enable_event(kchan, event,
1599 filter_expression_a, filter_a);
29c62722 1600 if (ret != LTTNG_OK) {
00a62084
MD
1601 free(filter_expression_a);
1602 free(filter_a);
29c62722
MD
1603 goto error;
1604 }
1605 break;
1606 }
6e6ef3d7
DG
1607 case LTTNG_EVENT_PROBE:
1608 case LTTNG_EVENT_FUNCTION:
1609 case LTTNG_EVENT_FUNCTION_ENTRY:
6e911cad 1610 case LTTNG_EVENT_TRACEPOINT:
00a62084
MD
1611 ret = event_kernel_enable_event(kchan, event,
1612 filter_expression, filter);
a969e101
MD
1613 /* We have passed ownership */
1614 filter_expression = NULL;
1615 filter = NULL;
6e911cad
MD
1616 if (ret != LTTNG_OK) {
1617 if (channel_created) {
1618 /* Let's not leak a useless channel. */
1619 kernel_destroy_channel(kchan);
1620 }
1621 goto error;
e5f5db7f 1622 }
6e911cad
MD
1623 break;
1624 case LTTNG_EVENT_SYSCALL:
00a62084
MD
1625 ret = event_kernel_enable_event(kchan, event,
1626 filter_expression, filter);
a969e101
MD
1627 /* We have passed ownership */
1628 filter_expression = NULL;
1629 filter = NULL;
e2b957af
MD
1630 if (ret != LTTNG_OK) {
1631 goto error;
1632 }
6e911cad
MD
1633 break;
1634 default:
1635 ret = LTTNG_ERR_UNK;
2f77fc4b
DG
1636 goto error;
1637 }
1638
1639 kernel_wait_quiescent(kernel_tracer_fd);
1640 break;
1641 }
1642 case LTTNG_DOMAIN_UST:
1643 {
1644 struct ltt_ust_channel *uchan;
1645 struct ltt_ust_session *usess = session->ust_session;
1646
1647 assert(usess);
1648
85076754
MD
1649 /*
1650 * If a non-default channel has been created in the
1651 * session, explicitely require that -c chan_name needs
1652 * to be provided.
1653 */
1654 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1655 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1656 goto error;
1657 }
1658
2f77fc4b
DG
1659 /* Get channel from global UST domain */
1660 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1661 channel_name);
1662 if (uchan == NULL) {
1663 /* Create default channel */
0a9c6494
DG
1664 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1665 usess->buffer_type);
2f77fc4b 1666 if (attr == NULL) {
f73fabfd 1667 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
1668 goto error;
1669 }
1670 strncpy(attr->name, channel_name, sizeof(attr->name));
1671
1672 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1673 if (ret != LTTNG_OK) {
2f77fc4b
DG
1674 free(attr);
1675 goto error;
1676 }
1677 free(attr);
1678
1679 /* Get the newly created channel reference back */
1680 uchan = trace_ust_find_channel_by_name(
1681 usess->domain_global.channels, channel_name);
1682 assert(uchan);
1683 }
1684
dac8e046
JG
1685 if (!internal_event) {
1686 /*
1687 * Ensure the event name is not reserved for internal
1688 * use.
1689 */
1690 ret = validate_ust_event_name(event->name);
1691 if (ret) {
1692 WARN("Userspace event name %s failed validation.",
1693 event->name ?
1694 event->name : "NULL");
1695 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1696 goto error;
1697 }
1698 }
1699
2f77fc4b 1700 /* At this point, the session and channel exist on the tracer */
6b453b5e 1701 ret = event_ust_enable_tracepoint(usess, uchan, event,
88f06f15
JG
1702 filter_expression, filter, exclusion,
1703 internal_event);
49d21f93
MD
1704 /* We have passed ownership */
1705 filter_expression = NULL;
1706 filter = NULL;
1707 exclusion = NULL;
f73fabfd 1708 if (ret != LTTNG_OK) {
2f77fc4b
DG
1709 goto error;
1710 }
1711 break;
1712 }
5cdb6027 1713 case LTTNG_DOMAIN_LOG4J:
f20baf8e 1714 case LTTNG_DOMAIN_JUL:
0e115563 1715 case LTTNG_DOMAIN_PYTHON:
f20baf8e 1716 {
da6c3a50 1717 const char *default_event_name, *default_chan_name;
fefd409b 1718 struct agent *agt;
f20baf8e
DG
1719 struct lttng_event uevent;
1720 struct lttng_domain tmp_dom;
1721 struct ltt_ust_session *usess = session->ust_session;
1722
1723 assert(usess);
1724
5cdb6027 1725 agt = trace_ust_find_agent(usess, domain->type);
fefd409b 1726 if (!agt) {
5cdb6027 1727 agt = agent_create(domain->type);
fefd409b
DG
1728 if (!agt) {
1729 ret = -LTTNG_ERR_NOMEM;
1730 goto error;
1731 }
1732 agent_add(agt, usess->agents);
1733 }
1734
022d91ba 1735 /* Create the default tracepoint. */
996de3c7 1736 memset(&uevent, 0, sizeof(uevent));
f20baf8e
DG
1737 uevent.type = LTTNG_EVENT_TRACEPOINT;
1738 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
da6c3a50
DG
1739 default_event_name = event_get_default_agent_ust_name(domain->type);
1740 if (!default_event_name) {
1741 ret = -LTTNG_ERR_FATAL;
1742 goto error;
f43f95a9 1743 }
da6c3a50 1744 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
f20baf8e
DG
1745 uevent.name[sizeof(uevent.name) - 1] = '\0';
1746
1747 /*
1748 * The domain type is changed because we are about to enable the
1749 * default channel and event for the JUL domain that are hardcoded.
1750 * This happens in the UST domain.
1751 */
1752 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1753 tmp_dom.type = LTTNG_DOMAIN_UST;
1754
0e115563
DG
1755 switch (domain->type) {
1756 case LTTNG_DOMAIN_LOG4J:
da6c3a50 1757 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
0e115563
DG
1758 break;
1759 case LTTNG_DOMAIN_JUL:
da6c3a50 1760 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
0e115563
DG
1761 break;
1762 case LTTNG_DOMAIN_PYTHON:
1763 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
1764 break;
1765 default:
e98a44b0 1766 /* The switch/case we are in makes this impossible */
0e115563 1767 assert(0);
da6c3a50
DG
1768 }
1769
971da06a
JG
1770 {
1771 struct lttng_filter_bytecode *filter_copy = NULL;
8404118c 1772 char *filter_expression_copy = NULL;
971da06a
JG
1773
1774 if (filter) {
1775 filter_copy = zmalloc(
1776 sizeof(struct lttng_filter_bytecode)
1777 + filter->len);
1778 if (!filter_copy) {
1779 goto error;
1780 }
1781
1782 memcpy(filter_copy, filter,
8404118c
JG
1783 sizeof(struct lttng_filter_bytecode)
1784 + filter->len);
1785 }
1786
1787 if (filter_expression) {
1788 filter_expression_copy =
1789 strdup(filter_expression);
1790 if (!filter_expression) {
1791 ret = LTTNG_ERR_NOMEM;
1792 goto error_free_copy;
1793 }
971da06a
JG
1794 }
1795
88f06f15 1796 ret = cmd_enable_event_internal(session, &tmp_dom,
971da06a 1797 (char *) default_chan_name,
8404118c
JG
1798 &uevent, filter_expression_copy,
1799 filter_copy, NULL, wpipe);
1800 filter_copy = NULL;
1801 filter_expression_copy = NULL;
1802error_free_copy:
1803 free(filter_copy);
1804 free(filter_expression_copy);
971da06a
JG
1805 }
1806
f20baf8e
DG
1807 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1808 goto error;
1809 }
1810
1811 /* The wild card * means that everything should be enabled. */
1812 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
8404118c
JG
1813 ret = event_agent_enable_all(usess, agt, event, filter,
1814 filter_expression);
971da06a 1815 filter = NULL;
f20baf8e 1816 } else {
8404118c
JG
1817 ret = event_agent_enable(usess, agt, event, filter,
1818 filter_expression);
971da06a 1819 filter = NULL;
f20baf8e
DG
1820 }
1821 if (ret != LTTNG_OK) {
1822 goto error;
1823 }
1824
1825 break;
1826 }
2f77fc4b 1827 default:
f73fabfd 1828 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1829 goto error;
1830 }
1831
f73fabfd 1832 ret = LTTNG_OK;
2f77fc4b
DG
1833
1834error:
49d21f93
MD
1835 free(filter_expression);
1836 free(filter);
1837 free(exclusion);
2223c96f 1838 rcu_read_unlock();
2f77fc4b
DG
1839 return ret;
1840}
1841
88f06f15
JG
1842/*
1843 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1844 * We own filter, exclusion, and filter_expression.
1845 */
1846int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1847 char *channel_name, struct lttng_event *event,
1848 char *filter_expression,
1849 struct lttng_filter_bytecode *filter,
1850 struct lttng_event_exclusion *exclusion,
1851 int wpipe)
1852{
1853 return _cmd_enable_event(session, domain, channel_name, event,
1854 filter_expression, filter, exclusion, wpipe, false);
1855}
1856
1857/*
1858 * Enable an event which is internal to LTTng. An internal should
1859 * never be made visible to clients and are immune to checks such as
1860 * reserved names.
1861 */
1862static int cmd_enable_event_internal(struct ltt_session *session,
1863 struct lttng_domain *domain,
1864 char *channel_name, struct lttng_event *event,
1865 char *filter_expression,
1866 struct lttng_filter_bytecode *filter,
1867 struct lttng_event_exclusion *exclusion,
1868 int wpipe)
1869{
1870 return _cmd_enable_event(session, domain, channel_name, event,
1871 filter_expression, filter, exclusion, wpipe, true);
1872}
1873
2f77fc4b
DG
1874/*
1875 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1876 */
56a37563
JG
1877ssize_t cmd_list_tracepoints(enum lttng_domain_type domain,
1878 struct lttng_event **events)
2f77fc4b
DG
1879{
1880 int ret;
1881 ssize_t nb_events = 0;
1882
1883 switch (domain) {
1884 case LTTNG_DOMAIN_KERNEL:
1885 nb_events = kernel_list_events(kernel_tracer_fd, events);
1886 if (nb_events < 0) {
f73fabfd 1887 ret = LTTNG_ERR_KERN_LIST_FAIL;
2f77fc4b
DG
1888 goto error;
1889 }
1890 break;
1891 case LTTNG_DOMAIN_UST:
1892 nb_events = ust_app_list_events(events);
1893 if (nb_events < 0) {
f73fabfd 1894 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
1895 goto error;
1896 }
1897 break;
5cdb6027 1898 case LTTNG_DOMAIN_LOG4J:
3c6a091f 1899 case LTTNG_DOMAIN_JUL:
0e115563 1900 case LTTNG_DOMAIN_PYTHON:
f60140a1 1901 nb_events = agent_list_events(events, domain);
3c6a091f
DG
1902 if (nb_events < 0) {
1903 ret = LTTNG_ERR_UST_LIST_FAIL;
1904 goto error;
1905 }
1906 break;
2f77fc4b 1907 default:
f73fabfd 1908 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1909 goto error;
1910 }
1911
1912 return nb_events;
1913
1914error:
1915 /* Return negative value to differentiate return code */
1916 return -ret;
1917}
1918
1919/*
1920 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1921 */
56a37563 1922ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain,
2f77fc4b
DG
1923 struct lttng_event_field **fields)
1924{
1925 int ret;
1926 ssize_t nb_fields = 0;
1927
1928 switch (domain) {
1929 case LTTNG_DOMAIN_UST:
1930 nb_fields = ust_app_list_event_fields(fields);
1931 if (nb_fields < 0) {
f73fabfd 1932 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
1933 goto error;
1934 }
1935 break;
1936 case LTTNG_DOMAIN_KERNEL:
1937 default: /* fall-through */
f73fabfd 1938 ret = LTTNG_ERR_UND;
2f77fc4b
DG
1939 goto error;
1940 }
1941
1942 return nb_fields;
1943
1944error:
1945 /* Return negative value to differentiate return code */
1946 return -ret;
1947}
1948
834978fd
DG
1949ssize_t cmd_list_syscalls(struct lttng_event **events)
1950{
1951 return syscall_table_list(events);
1952}
1953
a5dfbb9d
MD
1954/*
1955 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
1956 *
1957 * Called with session lock held.
1958 */
1959ssize_t cmd_list_tracker_pids(struct ltt_session *session,
56a37563 1960 enum lttng_domain_type domain, int32_t **pids)
a5dfbb9d
MD
1961{
1962 int ret;
1963 ssize_t nr_pids = 0;
1964
1965 switch (domain) {
1966 case LTTNG_DOMAIN_KERNEL:
1967 {
1968 struct ltt_kernel_session *ksess;
1969
1970 ksess = session->kernel_session;
1971 nr_pids = kernel_list_tracker_pids(ksess, pids);
1972 if (nr_pids < 0) {
1973 ret = LTTNG_ERR_KERN_LIST_FAIL;
1974 goto error;
1975 }
1976 break;
1977 }
1978 case LTTNG_DOMAIN_UST:
1979 {
1980 struct ltt_ust_session *usess;
1981
1982 usess = session->ust_session;
1983 nr_pids = trace_ust_list_tracker_pids(usess, pids);
1984 if (nr_pids < 0) {
1985 ret = LTTNG_ERR_UST_LIST_FAIL;
1986 goto error;
1987 }
1988 break;
1989 }
1990 case LTTNG_DOMAIN_LOG4J:
1991 case LTTNG_DOMAIN_JUL:
1992 case LTTNG_DOMAIN_PYTHON:
1993 default:
1994 ret = LTTNG_ERR_UND;
1995 goto error;
1996 }
1997
1998 return nr_pids;
1999
2000error:
2001 /* Return negative value to differentiate return code */
2002 return -ret;
2003}
2004
2f77fc4b
DG
2005/*
2006 * Command LTTNG_START_TRACE processed by the client thread.
a9ad0c8f
MD
2007 *
2008 * Called with session mutex held.
2f77fc4b
DG
2009 */
2010int cmd_start_trace(struct ltt_session *session)
2011{
2012 int ret;
cde3e505 2013 unsigned long nb_chan = 0;
2f77fc4b
DG
2014 struct ltt_kernel_session *ksession;
2015 struct ltt_ust_session *usess;
2f77fc4b
DG
2016
2017 assert(session);
2018
2019 /* Ease our life a bit ;) */
2020 ksession = session->kernel_session;
2021 usess = session->ust_session;
2022
8382cf6f
DG
2023 /* Is the session already started? */
2024 if (session->active) {
f73fabfd 2025 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2026 goto error;
2027 }
2028
cde3e505
DG
2029 /*
2030 * Starting a session without channel is useless since after that it's not
2031 * possible to enable channel thus inform the client.
2032 */
2033 if (usess && usess->domain_global.channels) {
2034 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
2035 }
2036 if (ksession) {
2037 nb_chan += ksession->channel_count;
2038 }
2039 if (!nb_chan) {
2040 ret = LTTNG_ERR_NO_CHANNEL;
2041 goto error;
2042 }
2043
2f77fc4b
DG
2044 /* Kernel tracing */
2045 if (ksession != NULL) {
9b6c7ec5
DG
2046 ret = start_kernel_session(ksession, kernel_tracer_fd);
2047 if (ret != LTTNG_OK) {
2f77fc4b
DG
2048 goto error;
2049 }
2f77fc4b
DG
2050 }
2051
2052 /* Flag session that trace should start automatically */
2053 if (usess) {
14fb1ebe
DG
2054 /*
2055 * Even though the start trace might fail, flag this session active so
2056 * other application coming in are started by default.
2057 */
2058 usess->active = 1;
2f77fc4b
DG
2059
2060 ret = ust_app_start_trace_all(usess);
2061 if (ret < 0) {
f73fabfd 2062 ret = LTTNG_ERR_UST_START_FAIL;
2f77fc4b
DG
2063 goto error;
2064 }
2065 }
2066
8382cf6f
DG
2067 /* Flag this after a successful start. */
2068 session->has_been_started = 1;
2069 session->active = 1;
9b6c7ec5 2070
f73fabfd 2071 ret = LTTNG_OK;
2f77fc4b
DG
2072
2073error:
2074 return ret;
2075}
2076
2077/*
2078 * Command LTTNG_STOP_TRACE processed by the client thread.
2079 */
2080int cmd_stop_trace(struct ltt_session *session)
2081{
2082 int ret;
2083 struct ltt_kernel_channel *kchan;
2084 struct ltt_kernel_session *ksession;
2085 struct ltt_ust_session *usess;
2086
2087 assert(session);
2088
2089 /* Short cut */
2090 ksession = session->kernel_session;
2091 usess = session->ust_session;
2092
8382cf6f
DG
2093 /* Session is not active. Skip everythong and inform the client. */
2094 if (!session->active) {
f73fabfd 2095 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2f77fc4b
DG
2096 goto error;
2097 }
2098
2f77fc4b 2099 /* Kernel tracer */
14fb1ebe 2100 if (ksession && ksession->active) {
2f77fc4b
DG
2101 DBG("Stop kernel tracing");
2102
2103 /* Flush metadata if exist */
2104 if (ksession->metadata_stream_fd >= 0) {
2105 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2106 if (ret < 0) {
2107 ERR("Kernel metadata flush failed");
2108 }
2109 }
2110
2111 /* Flush all buffers before stopping */
2112 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2113 ret = kernel_flush_buffer(kchan);
2114 if (ret < 0) {
2115 ERR("Kernel flush buffer error");
2116 }
2117 }
2118
2119 ret = kernel_stop_session(ksession);
2120 if (ret < 0) {
f73fabfd 2121 ret = LTTNG_ERR_KERN_STOP_FAIL;
2f77fc4b
DG
2122 goto error;
2123 }
2124
2125 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5 2126
14fb1ebe 2127 ksession->active = 0;
2f77fc4b
DG
2128 }
2129
14fb1ebe
DG
2130 if (usess && usess->active) {
2131 /*
2132 * Even though the stop trace might fail, flag this session inactive so
2133 * other application coming in are not started by default.
2134 */
2135 usess->active = 0;
2f77fc4b
DG
2136
2137 ret = ust_app_stop_trace_all(usess);
2138 if (ret < 0) {
f73fabfd 2139 ret = LTTNG_ERR_UST_STOP_FAIL;
2f77fc4b
DG
2140 goto error;
2141 }
2142 }
2143
8382cf6f
DG
2144 /* Flag inactive after a successful stop. */
2145 session->active = 0;
f73fabfd 2146 ret = LTTNG_OK;
2f77fc4b
DG
2147
2148error:
2149 return ret;
2150}
2151
2152/*
2153 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2154 */
bda32d56
JG
2155int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2156 struct lttng_uri *uris)
2f77fc4b
DG
2157{
2158 int ret, i;
2159 struct ltt_kernel_session *ksess = session->kernel_session;
2160 struct ltt_ust_session *usess = session->ust_session;
2f77fc4b
DG
2161
2162 assert(session);
2163 assert(uris);
2164 assert(nb_uri > 0);
2165
8382cf6f
DG
2166 /* Can't set consumer URI if the session is active. */
2167 if (session->active) {
f73fabfd 2168 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG
2169 goto error;
2170 }
2171
bda32d56 2172 /* Set the "global" consumer URIs */
2f77fc4b 2173 for (i = 0; i < nb_uri; i++) {
bda32d56
JG
2174 ret = add_uri_to_consumer(session->consumer,
2175 &uris[i], 0, session->name);
a74934ba 2176 if (ret != LTTNG_OK) {
2f77fc4b
DG
2177 goto error;
2178 }
2f77fc4b
DG
2179 }
2180
bda32d56
JG
2181 /* Set UST session URIs */
2182 if (session->ust_session) {
2183 for (i = 0; i < nb_uri; i++) {
2184 ret = add_uri_to_consumer(
2185 session->ust_session->consumer,
2186 &uris[i], LTTNG_DOMAIN_UST,
2187 session->name);
2188 if (ret != LTTNG_OK) {
2189 goto error;
2190 }
2191 }
2192 }
2193
2194 /* Set kernel session URIs */
2195 if (session->kernel_session) {
2196 for (i = 0; i < nb_uri; i++) {
2197 ret = add_uri_to_consumer(
2198 session->kernel_session->consumer,
2199 &uris[i], LTTNG_DOMAIN_KERNEL,
2200 session->name);
2201 if (ret != LTTNG_OK) {
2202 goto error;
2203 }
2204 }
2205 }
2206
7ab70fe0
DG
2207 /*
2208 * Make sure to set the session in output mode after we set URI since a
2209 * session can be created without URL (thus flagged in no output mode).
2210 */
2211 session->output_traces = 1;
2212 if (ksess) {
2213 ksess->output_traces = 1;
bda32d56
JG
2214 }
2215
2216 if (usess) {
7ab70fe0
DG
2217 usess->output_traces = 1;
2218 }
2219
2f77fc4b 2220 /* All good! */
f73fabfd 2221 ret = LTTNG_OK;
2f77fc4b
DG
2222
2223error:
2224 return ret;
2225}
2226
2227/*
2228 * Command LTTNG_CREATE_SESSION processed by the client thread.
2229 */
2230int cmd_create_session_uri(char *name, struct lttng_uri *uris,
ecc48a90 2231 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2f77fc4b
DG
2232{
2233 int ret;
2f77fc4b
DG
2234 struct ltt_session *session;
2235
2236 assert(name);
2bba9e53 2237 assert(creds);
785d2d0d 2238
2f77fc4b
DG
2239 /*
2240 * Verify if the session already exist
2241 *
2242 * XXX: There is no need for the session lock list here since the caller
2243 * (process_client_msg) is holding it. We might want to change that so a
2244 * single command does not lock the entire session list.
2245 */
2246 session = session_find_by_name(name);
2247 if (session != NULL) {
f73fabfd 2248 ret = LTTNG_ERR_EXIST_SESS;
2f77fc4b
DG
2249 goto find_error;
2250 }
2251
2252 /* Create tracing session in the registry */
dec56f6c 2253 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2f77fc4b 2254 LTTNG_SOCK_GET_GID_CRED(creds));
f73fabfd 2255 if (ret != LTTNG_OK) {
2f77fc4b
DG
2256 goto session_error;
2257 }
2258
2259 /*
2260 * Get the newly created session pointer back
2261 *
2262 * XXX: There is no need for the session lock list here since the caller
2263 * (process_client_msg) is holding it. We might want to change that so a
2264 * single command does not lock the entire session list.
2265 */
2266 session = session_find_by_name(name);
2267 assert(session);
2268
ecc48a90 2269 session->live_timer = live_timer;
2f77fc4b
DG
2270 /* Create default consumer output for the session not yet created. */
2271 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2272 if (session->consumer == NULL) {
f73fabfd 2273 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2274 goto consumer_error;
2275 }
2276
2bba9e53 2277 if (uris) {
bda32d56 2278 ret = cmd_set_consumer_uri(session, nb_uri, uris);
2bba9e53
DG
2279 if (ret != LTTNG_OK) {
2280 goto consumer_error;
2281 }
2282 session->output_traces = 1;
2283 } else {
2284 session->output_traces = 0;
2285 DBG2("Session %s created with no output", session->name);
2f77fc4b
DG
2286 }
2287
2288 session->consumer->enabled = 1;
2289
f73fabfd 2290 return LTTNG_OK;
2f77fc4b
DG
2291
2292consumer_error:
2293 session_destroy(session);
2294session_error:
2295find_error:
2296 return ret;
2297}
2298
27babd3a
DG
2299/*
2300 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2301 */
2302int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2303 size_t nb_uri, lttng_sock_cred *creds)
2304{
2305 int ret;
2306 struct ltt_session *session;
2307 struct snapshot_output *new_output = NULL;
2308
2309 assert(name);
2310 assert(creds);
2311
2312 /*
2313 * Create session in no output mode with URIs set to NULL. The uris we've
2314 * received are for a default snapshot output if one.
2315 */
ecc48a90 2316 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
27babd3a
DG
2317 if (ret != LTTNG_OK) {
2318 goto error;
2319 }
2320
2321 /* Get the newly created session pointer back. This should NEVER fail. */
2322 session = session_find_by_name(name);
2323 assert(session);
2324
2325 /* Flag session for snapshot mode. */
2326 session->snapshot_mode = 1;
2327
2328 /* Skip snapshot output creation if no URI is given. */
2329 if (nb_uri == 0) {
2330 goto end;
2331 }
2332
2333 new_output = snapshot_output_alloc();
2334 if (!new_output) {
2335 ret = LTTNG_ERR_NOMEM;
2336 goto error_snapshot_alloc;
2337 }
2338
2339 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2340 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2341 if (ret < 0) {
2342 if (ret == -ENOMEM) {
2343 ret = LTTNG_ERR_NOMEM;
2344 } else {
2345 ret = LTTNG_ERR_INVALID;
2346 }
2347 goto error_snapshot;
2348 }
2349
2350 rcu_read_lock();
2351 snapshot_add_output(&session->snapshot, new_output);
2352 rcu_read_unlock();
2353
2354end:
2355 return LTTNG_OK;
2356
2357error_snapshot:
2358 snapshot_output_destroy(new_output);
2359error_snapshot_alloc:
2360 session_destroy(session);
2361error:
2362 return ret;
2363}
2364
2f77fc4b
DG
2365/*
2366 * Command LTTNG_DESTROY_SESSION processed by the client thread.
a9ad0c8f
MD
2367 *
2368 * Called with session lock held.
2f77fc4b
DG
2369 */
2370int cmd_destroy_session(struct ltt_session *session, int wpipe)
2371{
2372 int ret;
2373 struct ltt_ust_session *usess;
2374 struct ltt_kernel_session *ksess;
2375
2376 /* Safety net */
2377 assert(session);
2378
2379 usess = session->ust_session;
2380 ksess = session->kernel_session;
2381
2382 /* Clean kernel session teardown */
2383 kernel_destroy_session(ksess);
2384
2385 /* UST session teardown */
2386 if (usess) {
2387 /* Close any relayd session */
2388 consumer_output_send_destroy_relayd(usess->consumer);
2389
2390 /* Destroy every UST application related to this session. */
2391 ret = ust_app_destroy_trace_all(usess);
2392 if (ret) {
2393 ERR("Error in ust_app_destroy_trace_all");
2394 }
2395
2396 /* Clean up the rest. */
2397 trace_ust_destroy_session(usess);
2398 }
2399
2400 /*
2401 * Must notify the kernel thread here to update it's poll set in order to
2402 * remove the channel(s)' fd just destroyed.
2403 */
2404 ret = notify_thread_pipe(wpipe);
2405 if (ret < 0) {
2406 PERROR("write kernel poll pipe");
2407 }
2408
2409 ret = session_destroy(session);
2410
2411 return ret;
2412}
2413
2414/*
2415 * Command LTTNG_CALIBRATE processed by the client thread.
2416 */
56a37563
JG
2417int cmd_calibrate(enum lttng_domain_type domain,
2418 struct lttng_calibrate *calibrate)
2f77fc4b
DG
2419{
2420 int ret;
2421
2422 switch (domain) {
2423 case LTTNG_DOMAIN_KERNEL:
2424 {
2425 struct lttng_kernel_calibrate kcalibrate;
2426
2e84128e
DG
2427 switch (calibrate->type) {
2428 case LTTNG_CALIBRATE_FUNCTION:
2429 default:
2430 /* Default and only possible calibrate option. */
2431 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2432 break;
2433 }
2434
2f77fc4b
DG
2435 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2436 if (ret < 0) {
f73fabfd 2437 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2f77fc4b
DG
2438 goto error;
2439 }
2440 break;
2441 }
2442 case LTTNG_DOMAIN_UST:
2443 {
2444 struct lttng_ust_calibrate ucalibrate;
2445
2e84128e
DG
2446 switch (calibrate->type) {
2447 case LTTNG_CALIBRATE_FUNCTION:
2448 default:
2449 /* Default and only possible calibrate option. */
2450 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2451 break;
2452 }
2453
2f77fc4b
DG
2454 ret = ust_app_calibrate_glb(&ucalibrate);
2455 if (ret < 0) {
f73fabfd 2456 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2f77fc4b
DG
2457 goto error;
2458 }
2459 break;
2460 }
2461 default:
f73fabfd 2462 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2463 goto error;
2464 }
2465
f73fabfd 2466 ret = LTTNG_OK;
2f77fc4b
DG
2467
2468error:
2469 return ret;
2470}
2471
2472/*
2473 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2474 */
56a37563
JG
2475int cmd_register_consumer(struct ltt_session *session,
2476 enum lttng_domain_type domain, const char *sock_path,
2477 struct consumer_data *cdata)
2f77fc4b
DG
2478{
2479 int ret, sock;
dd81b457 2480 struct consumer_socket *socket = NULL;
2f77fc4b
DG
2481
2482 assert(session);
2483 assert(cdata);
2484 assert(sock_path);
2485
2486 switch (domain) {
2487 case LTTNG_DOMAIN_KERNEL:
2488 {
2489 struct ltt_kernel_session *ksess = session->kernel_session;
2490
2491 assert(ksess);
2492
2493 /* Can't register a consumer if there is already one */
2494 if (ksess->consumer_fds_sent != 0) {
f73fabfd 2495 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
2496 goto error;
2497 }
2498
2499 sock = lttcomm_connect_unix_sock(sock_path);
2500 if (sock < 0) {
f73fabfd 2501 ret = LTTNG_ERR_CONNECT_FAIL;
2f77fc4b
DG
2502 goto error;
2503 }
4ce514c4 2504 cdata->cmd_sock = sock;
2f77fc4b 2505
4ce514c4 2506 socket = consumer_allocate_socket(&cdata->cmd_sock);
2f77fc4b 2507 if (socket == NULL) {
f66c074c
DG
2508 ret = close(sock);
2509 if (ret < 0) {
2510 PERROR("close register consumer");
2511 }
4ce514c4 2512 cdata->cmd_sock = -1;
f73fabfd 2513 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2514 goto error;
2515 }
2516
2517 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2518 if (socket->lock == NULL) {
2519 PERROR("zmalloc pthread mutex");
f73fabfd 2520 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2521 goto error;
2522 }
2523 pthread_mutex_init(socket->lock, NULL);
2524 socket->registered = 1;
2525
2526 rcu_read_lock();
2527 consumer_add_socket(socket, ksess->consumer);
2528 rcu_read_unlock();
2529
2530 pthread_mutex_lock(&cdata->pid_mutex);
2531 cdata->pid = -1;
2532 pthread_mutex_unlock(&cdata->pid_mutex);
2533
2534 break;
2535 }
2536 default:
2537 /* TODO: Userspace tracing */
f73fabfd 2538 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2539 goto error;
2540 }
2541
dd81b457 2542 return LTTNG_OK;
2f77fc4b
DG
2543
2544error:
dd81b457
DG
2545 if (socket) {
2546 consumer_destroy_socket(socket);
2547 }
2f77fc4b
DG
2548 return ret;
2549}
2550
2551/*
2552 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2553 */
2554ssize_t cmd_list_domains(struct ltt_session *session,
2555 struct lttng_domain **domains)
2556{
2557 int ret, index = 0;
2558 ssize_t nb_dom = 0;
fefd409b
DG
2559 struct agent *agt;
2560 struct lttng_ht_iter iter;
2f77fc4b
DG
2561
2562 if (session->kernel_session != NULL) {
2563 DBG3("Listing domains found kernel domain");
2564 nb_dom++;
2565 }
2566
2567 if (session->ust_session != NULL) {
2568 DBG3("Listing domains found UST global domain");
2569 nb_dom++;
3c6a091f 2570
e0a74f01 2571 rcu_read_lock();
fefd409b
DG
2572 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2573 agt, node.node) {
2574 if (agt->being_used) {
2575 nb_dom++;
2576 }
3c6a091f 2577 }
e0a74f01 2578 rcu_read_unlock();
2f77fc4b
DG
2579 }
2580
fa64dfb4
JG
2581 if (!nb_dom) {
2582 goto end;
2583 }
2584
2f77fc4b
DG
2585 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2586 if (*domains == NULL) {
f73fabfd 2587 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2588 goto error;
2589 }
2590
2591 if (session->kernel_session != NULL) {
2592 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
b5edb9e8
PP
2593
2594 /* Kernel session buffer type is always GLOBAL */
2595 (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL;
2596
2f77fc4b
DG
2597 index++;
2598 }
2599
2600 if (session->ust_session != NULL) {
2601 (*domains)[index].type = LTTNG_DOMAIN_UST;
88c5f0d8 2602 (*domains)[index].buf_type = session->ust_session->buffer_type;
2f77fc4b 2603 index++;
3c6a091f 2604
e0a74f01 2605 rcu_read_lock();
fefd409b
DG
2606 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2607 agt, node.node) {
2608 if (agt->being_used) {
2609 (*domains)[index].type = agt->domain;
2610 (*domains)[index].buf_type = session->ust_session->buffer_type;
2611 index++;
2612 }
3c6a091f 2613 }
e0a74f01 2614 rcu_read_unlock();
2f77fc4b 2615 }
fa64dfb4 2616end:
2f77fc4b
DG
2617 return nb_dom;
2618
2619error:
f73fabfd
DG
2620 /* Return negative value to differentiate return code */
2621 return -ret;
2f77fc4b
DG
2622}
2623
2624
2625/*
2626 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2627 */
56a37563
JG
2628ssize_t cmd_list_channels(enum lttng_domain_type domain,
2629 struct ltt_session *session, struct lttng_channel **channels)
2f77fc4b
DG
2630{
2631 int ret;
2632 ssize_t nb_chan = 0;
2633
2634 switch (domain) {
2635 case LTTNG_DOMAIN_KERNEL:
2636 if (session->kernel_session != NULL) {
2637 nb_chan = session->kernel_session->channel_count;
2638 }
2639 DBG3("Number of kernel channels %zd", nb_chan);
c7d620a2
DG
2640 if (nb_chan <= 0) {
2641 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2642 }
2f77fc4b
DG
2643 break;
2644 case LTTNG_DOMAIN_UST:
2645 if (session->ust_session != NULL) {
7ffc31a2 2646 rcu_read_lock();
2f77fc4b 2647 nb_chan = lttng_ht_get_count(
7ffc31a2
JG
2648 session->ust_session->domain_global.channels);
2649 rcu_read_unlock();
2f77fc4b
DG
2650 }
2651 DBG3("Number of UST global channels %zd", nb_chan);
ade7ce52 2652 if (nb_chan < 0) {
c7d620a2 2653 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
ade7ce52 2654 goto error;
c7d620a2 2655 }
2f77fc4b
DG
2656 break;
2657 default:
f73fabfd 2658 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2659 goto error;
2660 }
2661
2662 if (nb_chan > 0) {
2663 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2664 if (*channels == NULL) {
f73fabfd 2665 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2666 goto error;
2667 }
2668
2669 list_lttng_channels(domain, session, *channels);
2f77fc4b
DG
2670 }
2671
2672 return nb_chan;
2673
2674error:
f73fabfd
DG
2675 /* Return negative value to differentiate return code */
2676 return -ret;
2f77fc4b
DG
2677}
2678
2679/*
2680 * Command LTTNG_LIST_EVENTS processed by the client thread.
2681 */
56a37563
JG
2682ssize_t cmd_list_events(enum lttng_domain_type domain,
2683 struct ltt_session *session, char *channel_name,
2684 struct lttng_event **events)
2f77fc4b
DG
2685{
2686 int ret = 0;
2687 ssize_t nb_event = 0;
2688
2689 switch (domain) {
2690 case LTTNG_DOMAIN_KERNEL:
2691 if (session->kernel_session != NULL) {
2692 nb_event = list_lttng_kernel_events(channel_name,
2693 session->kernel_session, events);
2694 }
2695 break;
2696 case LTTNG_DOMAIN_UST:
2697 {
2698 if (session->ust_session != NULL) {
2699 nb_event = list_lttng_ust_global_events(channel_name,
2700 &session->ust_session->domain_global, events);
2701 }
2702 break;
2703 }
5cdb6027 2704 case LTTNG_DOMAIN_LOG4J:
3c6a091f 2705 case LTTNG_DOMAIN_JUL:
0e115563 2706 case LTTNG_DOMAIN_PYTHON:
3c6a091f 2707 if (session->ust_session) {
fefd409b
DG
2708 struct lttng_ht_iter iter;
2709 struct agent *agt;
2710
b11feea5 2711 rcu_read_lock();
fefd409b
DG
2712 cds_lfht_for_each_entry(session->ust_session->agents->ht,
2713 &iter.iter, agt, node.node) {
2714 nb_event = list_lttng_agent_events(agt, events);
2715 }
b11feea5 2716 rcu_read_unlock();
3c6a091f
DG
2717 }
2718 break;
2f77fc4b 2719 default:
f73fabfd 2720 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2721 goto error;
2722 }
2723
f73fabfd 2724 return nb_event;
2f77fc4b
DG
2725
2726error:
f73fabfd
DG
2727 /* Return negative value to differentiate return code */
2728 return -ret;
2f77fc4b
DG
2729}
2730
2731/*
2732 * Using the session list, filled a lttng_session array to send back to the
2733 * client for session listing.
2734 *
2735 * The session list lock MUST be acquired before calling this function. Use
2736 * session_lock_list() and session_unlock_list().
2737 */
2738void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2739 gid_t gid)
2740{
2741 int ret;
2742 unsigned int i = 0;
2743 struct ltt_session *session;
2744 struct ltt_session_list *list = session_get_list();
2745
2746 DBG("Getting all available session for UID %d GID %d",
2747 uid, gid);
2748 /*
2749 * Iterate over session list and append data after the control struct in
2750 * the buffer.
2751 */
2752 cds_list_for_each_entry(session, &list->head, list) {
2753 /*
2754 * Only list the sessions the user can control.
2755 */
2756 if (!session_access_ok(session, uid, gid)) {
2757 continue;
2758 }
2759
2760 struct ltt_kernel_session *ksess = session->kernel_session;
2761 struct ltt_ust_session *usess = session->ust_session;
2762
2763 if (session->consumer->type == CONSUMER_DST_NET ||
2764 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2765 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2766 ret = build_network_session_path(sessions[i].path,
dec56f6c 2767 sizeof(sessions[i].path), session);
2f77fc4b 2768 } else {
dec56f6c 2769 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2f77fc4b
DG
2770 session->consumer->dst.trace_path);
2771 }
2772 if (ret < 0) {
2773 PERROR("snprintf session path");
2774 continue;
2775 }
2776
2777 strncpy(sessions[i].name, session->name, NAME_MAX);
2778 sessions[i].name[NAME_MAX - 1] = '\0';
8382cf6f 2779 sessions[i].enabled = session->active;
2cbf8fed 2780 sessions[i].snapshot_mode = session->snapshot_mode;
8960e9cd 2781 sessions[i].live_timer_interval = session->live_timer;
2f77fc4b
DG
2782 i++;
2783 }
2784}
2785
806e2684 2786/*
6d805429 2787 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
d3f14b8a 2788 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
806e2684 2789 */
6d805429 2790int cmd_data_pending(struct ltt_session *session)
806e2684
DG
2791{
2792 int ret;
2793 struct ltt_kernel_session *ksess = session->kernel_session;
2794 struct ltt_ust_session *usess = session->ust_session;
2795
2796 assert(session);
2797
2798 /* Session MUST be stopped to ask for data availability. */
8382cf6f 2799 if (session->active) {
806e2684
DG
2800 ret = LTTNG_ERR_SESSION_STARTED;
2801 goto error;
3a89d11a
DG
2802 } else {
2803 /*
2804 * If stopped, just make sure we've started before else the above call
2805 * will always send that there is data pending.
2806 *
2807 * The consumer assumes that when the data pending command is received,
2808 * the trace has been started before or else no output data is written
2809 * by the streams which is a condition for data pending. So, this is
2810 * *VERY* important that we don't ask the consumer before a start
2811 * trace.
2812 */
8382cf6f 2813 if (!session->has_been_started) {
3a89d11a
DG
2814 ret = 0;
2815 goto error;
2816 }
806e2684
DG
2817 }
2818
2819 if (ksess && ksess->consumer) {
6d805429
DG
2820 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2821 if (ret == 1) {
806e2684
DG
2822 /* Data is still being extracted for the kernel. */
2823 goto error;
2824 }
2825 }
2826
2827 if (usess && usess->consumer) {
6d805429
DG
2828 ret = consumer_is_data_pending(usess->id, usess->consumer);
2829 if (ret == 1) {
806e2684
DG
2830 /* Data is still being extracted for the kernel. */
2831 goto error;
2832 }
2833 }
2834
2835 /* Data is ready to be read by a viewer */
6d805429 2836 ret = 0;
806e2684
DG
2837
2838error:
2839 return ret;
2840}
2841
6dc3064a
DG
2842/*
2843 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2844 *
2845 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2846 */
2847int cmd_snapshot_add_output(struct ltt_session *session,
2848 struct lttng_snapshot_output *output, uint32_t *id)
2849{
2850 int ret;
2851 struct snapshot_output *new_output;
2852
2853 assert(session);
2854 assert(output);
2855
2856 DBG("Cmd snapshot add output for session %s", session->name);
2857
2858 /*
d3f14b8a
MD
2859 * Permission denied to create an output if the session is not
2860 * set in no output mode.
6dc3064a
DG
2861 */
2862 if (session->output_traces) {
2863 ret = LTTNG_ERR_EPERM;
2864 goto error;
2865 }
2866
2867 /* Only one output is allowed until we have the "tee" feature. */
2868 if (session->snapshot.nb_output == 1) {
2869 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2870 goto error;
2871 }
2872
2873 new_output = snapshot_output_alloc();
2874 if (!new_output) {
2875 ret = LTTNG_ERR_NOMEM;
2876 goto error;
2877 }
2878
2879 ret = snapshot_output_init(output->max_size, output->name,
2880 output->ctrl_url, output->data_url, session->consumer, new_output,
2881 &session->snapshot);
2882 if (ret < 0) {
2883 if (ret == -ENOMEM) {
2884 ret = LTTNG_ERR_NOMEM;
2885 } else {
2886 ret = LTTNG_ERR_INVALID;
2887 }
2888 goto free_error;
2889 }
2890
6dc3064a
DG
2891 rcu_read_lock();
2892 snapshot_add_output(&session->snapshot, new_output);
2893 if (id) {
2894 *id = new_output->id;
2895 }
2896 rcu_read_unlock();
2897
2898 return LTTNG_OK;
2899
2900free_error:
2901 snapshot_output_destroy(new_output);
2902error:
2903 return ret;
2904}
2905
2906/*
2907 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2908 *
2909 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2910 */
2911int cmd_snapshot_del_output(struct ltt_session *session,
2912 struct lttng_snapshot_output *output)
2913{
2914 int ret;
eb240553 2915 struct snapshot_output *sout = NULL;
6dc3064a
DG
2916
2917 assert(session);
2918 assert(output);
2919
6dc3064a
DG
2920 rcu_read_lock();
2921
2922 /*
d3f14b8a
MD
2923 * Permission denied to create an output if the session is not
2924 * set in no output mode.
6dc3064a
DG
2925 */
2926 if (session->output_traces) {
2927 ret = LTTNG_ERR_EPERM;
2928 goto error;
2929 }
2930
eb240553
DG
2931 if (output->id) {
2932 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2933 session->name);
2934 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2935 } else if (*output->name != '\0') {
2936 DBG("Cmd snapshot del output name %s for session %s", output->name,
2937 session->name);
2938 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2939 }
6dc3064a
DG
2940 if (!sout) {
2941 ret = LTTNG_ERR_INVALID;
2942 goto error;
2943 }
2944
2945 snapshot_delete_output(&session->snapshot, sout);
2946 snapshot_output_destroy(sout);
2947 ret = LTTNG_OK;
2948
2949error:
2950 rcu_read_unlock();
2951 return ret;
2952}
2953
2954/*
2955 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2956 *
2957 * If no output is available, outputs is untouched and 0 is returned.
2958 *
2959 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2960 */
2961ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2962 struct lttng_snapshot_output **outputs)
2963{
2964 int ret, idx = 0;
b223ca94 2965 struct lttng_snapshot_output *list = NULL;
6dc3064a
DG
2966 struct lttng_ht_iter iter;
2967 struct snapshot_output *output;
2968
2969 assert(session);
2970 assert(outputs);
2971
2972 DBG("Cmd snapshot list outputs for session %s", session->name);
2973
2974 /*
d3f14b8a
MD
2975 * Permission denied to create an output if the session is not
2976 * set in no output mode.
6dc3064a
DG
2977 */
2978 if (session->output_traces) {
b223ca94 2979 ret = -LTTNG_ERR_EPERM;
6dc3064a
DG
2980 goto error;
2981 }
2982
2983 if (session->snapshot.nb_output == 0) {
2984 ret = 0;
2985 goto error;
2986 }
2987
2988 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2989 if (!list) {
b223ca94 2990 ret = -LTTNG_ERR_NOMEM;
6dc3064a
DG
2991 goto error;
2992 }
2993
2994 /* Copy list from session to the new list object. */
b223ca94 2995 rcu_read_lock();
6dc3064a
DG
2996 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2997 output, node.node) {
2998 assert(output->consumer);
2999 list[idx].id = output->id;
3000 list[idx].max_size = output->max_size;
3001 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
3002 if (output->consumer->type == CONSUMER_DST_LOCAL) {
3003 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
3004 sizeof(list[idx].ctrl_url));
3005 } else {
3006 /* Control URI. */
3007 ret = uri_to_str_url(&output->consumer->dst.net.control,
3008 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
3009 if (ret < 0) {
b223ca94
JG
3010 ret = -LTTNG_ERR_NOMEM;
3011 goto error;
6dc3064a
DG
3012 }
3013
3014 /* Data URI. */
3015 ret = uri_to_str_url(&output->consumer->dst.net.data,
3016 list[idx].data_url, sizeof(list[idx].data_url));
3017 if (ret < 0) {
b223ca94
JG
3018 ret = -LTTNG_ERR_NOMEM;
3019 goto error;
6dc3064a
DG
3020 }
3021 }
3022 idx++;
3023 }
3024
3025 *outputs = list;
b223ca94
JG
3026 list = NULL;
3027 ret = session->snapshot.nb_output;
6dc3064a 3028error:
b223ca94
JG
3029 free(list);
3030 rcu_read_unlock();
3031 return ret;
6dc3064a
DG
3032}
3033
3034/*
3035 * Send relayd sockets from snapshot output to consumer. Ignore request if the
3036 * snapshot output is *not* set with a remote destination.
3037 *
a934f4af 3038 * Return 0 on success or a LTTNG_ERR code.
6dc3064a
DG
3039 */
3040static int set_relayd_for_snapshot(struct consumer_output *consumer,
3041 struct snapshot_output *snap_output, struct ltt_session *session)
3042{
a934f4af 3043 int ret = LTTNG_OK;
6dc3064a
DG
3044 struct lttng_ht_iter iter;
3045 struct consumer_socket *socket;
3046
3047 assert(consumer);
3048 assert(snap_output);
3049 assert(session);
3050
3051 DBG2("Set relayd object from snapshot output");
3052
3053 /* Ignore if snapshot consumer output is not network. */
3054 if (snap_output->consumer->type != CONSUMER_DST_NET) {
3055 goto error;
3056 }
3057
3058 /*
3059 * For each consumer socket, create and send the relayd object of the
3060 * snapshot output.
3061 */
3062 rcu_read_lock();
5eecee74
DG
3063 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
3064 socket, node.node) {
6dc3064a 3065 ret = send_consumer_relayd_sockets(0, session->id,
d3e2ba59
JD
3066 snap_output->consumer, socket,
3067 session->name, session->hostname,
3068 session->live_timer);
a934f4af 3069 if (ret != LTTNG_OK) {
6dc3064a
DG
3070 rcu_read_unlock();
3071 goto error;
3072 }
3073 }
3074 rcu_read_unlock();
3075
3076error:
3077 return ret;
3078}
3079
3080/*
3081 * Record a kernel snapshot.
3082 *
fac41e72 3083 * Return LTTNG_OK on success or a LTTNG_ERR code.
6dc3064a
DG
3084 */
3085static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
5c786ded 3086 struct snapshot_output *output, struct ltt_session *session,
d07ceecd 3087 int wait, uint64_t nb_packets_per_stream)
6dc3064a
DG
3088{
3089 int ret;
3090
3091 assert(ksess);
3092 assert(output);
3093 assert(session);
3094
10a50311
JD
3095 /* Get the datetime for the snapshot output directory. */
3096 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
3097 sizeof(output->datetime));
3098 if (!ret) {
a934f4af 3099 ret = LTTNG_ERR_INVALID;
10a50311
JD
3100 goto error;
3101 }
3102
af706bb7
DG
3103 /*
3104 * Copy kernel session sockets so we can communicate with the right
3105 * consumer for the snapshot record command.
3106 */
3107 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
3108 if (ret < 0) {
a934f4af 3109 ret = LTTNG_ERR_NOMEM;
af706bb7 3110 goto error;
6dc3064a
DG
3111 }
3112
3113 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
a934f4af 3114 if (ret != LTTNG_OK) {
af706bb7 3115 goto error_snapshot;
6dc3064a
DG
3116 }
3117
d07ceecd 3118 ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream);
2a06df8d 3119 if (ret != LTTNG_OK) {
af706bb7 3120 goto error_snapshot;
6dc3064a
DG
3121 }
3122
a934f4af 3123 ret = LTTNG_OK;
1371fc12 3124 goto end;
a934f4af 3125
af706bb7
DG
3126error_snapshot:
3127 /* Clean up copied sockets so this output can use some other later on. */
3128 consumer_destroy_output_sockets(output->consumer);
6dc3064a 3129error:
1371fc12 3130end:
6dc3064a
DG
3131 return ret;
3132}
3133
3134/*
3135 * Record a UST snapshot.
3136 *
a934f4af 3137 * Return 0 on success or a LTTNG_ERR error code.
6dc3064a
DG
3138 */
3139static int record_ust_snapshot(struct ltt_ust_session *usess,
5c786ded 3140 struct snapshot_output *output, struct ltt_session *session,
d07ceecd 3141 int wait, uint64_t nb_packets_per_stream)
6dc3064a
DG
3142{
3143 int ret;
3144
3145 assert(usess);
3146 assert(output);
3147 assert(session);
3148
10a50311
JD
3149 /* Get the datetime for the snapshot output directory. */
3150 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
3151 sizeof(output->datetime));
3152 if (!ret) {
a934f4af 3153 ret = LTTNG_ERR_INVALID;
10a50311
JD
3154 goto error;
3155 }
3156
af706bb7 3157 /*
d3f14b8a 3158 * Copy UST session sockets so we can communicate with the right
af706bb7
DG
3159 * consumer for the snapshot record command.
3160 */
3161 ret = consumer_copy_sockets(output->consumer, usess->consumer);
3162 if (ret < 0) {
a934f4af 3163 ret = LTTNG_ERR_NOMEM;
af706bb7 3164 goto error;
6dc3064a
DG
3165 }
3166
3167 ret = set_relayd_for_snapshot(usess->consumer, output, session);
a934f4af 3168 if (ret != LTTNG_OK) {
af706bb7 3169 goto error_snapshot;
6dc3064a
DG
3170 }
3171
d07ceecd 3172 ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream);
6dc3064a 3173 if (ret < 0) {
7badf927
DG
3174 switch (-ret) {
3175 case EINVAL:
a934f4af 3176 ret = LTTNG_ERR_INVALID;
7badf927
DG
3177 break;
3178 case ENODATA:
3179 ret = LTTNG_ERR_SNAPSHOT_NODATA;
3180 break;
3181 default:
3182 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3183 break;
5c786ded 3184 }
af706bb7 3185 goto error_snapshot;
6dc3064a
DG
3186 }
3187
a934f4af
DG
3188 ret = LTTNG_OK;
3189
af706bb7
DG
3190error_snapshot:
3191 /* Clean up copied sockets so this output can use some other later on. */
3192 consumer_destroy_output_sockets(output->consumer);
6dc3064a
DG
3193error:
3194 return ret;
3195}
3196
d07ceecd
MD
3197static
3198uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session,
3199 uint64_t cur_nr_packets)
68808f4e 3200{
d07ceecd 3201 uint64_t tot_size = 0;
68808f4e
DG
3202
3203 if (session->kernel_session) {
3204 struct ltt_kernel_channel *chan;
3205 struct ltt_kernel_session *ksess = session->kernel_session;
3206
68808f4e 3207 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
d07ceecd
MD
3208 if (cur_nr_packets >= chan->channel->attr.num_subbuf) {
3209 /*
3210 * Don't take channel into account if we
3211 * already grab all its packets.
3212 */
3213 continue;
68808f4e 3214 }
d07ceecd
MD
3215 tot_size += chan->channel->attr.subbuf_size
3216 * chan->stream_count;
68808f4e
DG
3217 }
3218 }
3219
3220 if (session->ust_session) {
68808f4e
DG
3221 struct ltt_ust_session *usess = session->ust_session;
3222
d07ceecd
MD
3223 tot_size += ust_app_get_size_one_more_packet_per_stream(usess,
3224 cur_nr_packets);
68808f4e
DG
3225 }
3226
d07ceecd 3227 return tot_size;
68808f4e
DG
3228}
3229
5c786ded 3230/*
d07ceecd
MD
3231 * Calculate the number of packets we can grab from each stream that
3232 * fits within the overall snapshot max size.
3233 *
3234 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
3235 * the number of packets per stream.
3236 *
3237 * TODO: this approach is not perfect: we consider the worse case
3238 * (packet filling the sub-buffers) as an upper bound, but we could do
3239 * better if we do this calculation while we actually grab the packet
3240 * content: we would know how much padding we don't actually store into
3241 * the file.
3242 *
3243 * This algorithm is currently bounded by the number of packets per
3244 * stream.
3245 *
3246 * Since we call this algorithm before actually grabbing the data, it's
3247 * an approximation: for instance, applications could appear/disappear
3248 * in between this call and actually grabbing data.
5c786ded 3249 */
d07ceecd
MD
3250static
3251int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size)
5c786ded 3252{
d07ceecd
MD
3253 int64_t size_left;
3254 uint64_t cur_nb_packets = 0;
5c786ded 3255
d07ceecd
MD
3256 if (!max_size) {
3257 return 0; /* Infinite */
5c786ded
JD
3258 }
3259
d07ceecd
MD
3260 size_left = max_size;
3261 for (;;) {
3262 uint64_t one_more_packet_tot_size;
5c786ded 3263
d07ceecd
MD
3264 one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session,
3265 cur_nb_packets);
3266 if (!one_more_packet_tot_size) {
3267 /* We are already grabbing all packets. */
3268 break;
3269 }
3270 size_left -= one_more_packet_tot_size;
3271 if (size_left < 0) {
3272 break;
3273 }
3274 cur_nb_packets++;
5c786ded 3275 }
d07ceecd
MD
3276 if (!cur_nb_packets) {
3277 /* Not enough room to grab one packet of each stream, error. */
3278 return -1;
3279 }
3280 return cur_nb_packets;
5c786ded
JD
3281}
3282
6dc3064a
DG
3283/*
3284 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3285 *
3286 * The wait parameter is ignored so this call always wait for the snapshot to
3287 * complete before returning.
3288 *
3289 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3290 */
3291int cmd_snapshot_record(struct ltt_session *session,
3292 struct lttng_snapshot_output *output, int wait)
3293{
3294 int ret = LTTNG_OK;
e1986656
DG
3295 unsigned int use_tmp_output = 0;
3296 struct snapshot_output tmp_output;
00e1dfc4 3297 unsigned int snapshot_success = 0;
6dc3064a
DG
3298
3299 assert(session);
ba45d9f0 3300 assert(output);
6dc3064a
DG
3301
3302 DBG("Cmd snapshot record for session %s", session->name);
3303
3304 /*
d3f14b8a
MD
3305 * Permission denied to create an output if the session is not
3306 * set in no output mode.
6dc3064a
DG
3307 */
3308 if (session->output_traces) {
3309 ret = LTTNG_ERR_EPERM;
3310 goto error;
3311 }
3312
3313 /* The session needs to be started at least once. */
8382cf6f 3314 if (!session->has_been_started) {
6dc3064a
DG
3315 ret = LTTNG_ERR_START_SESSION_ONCE;
3316 goto error;
3317 }
3318
3319 /* Use temporary output for the session. */
ba45d9f0 3320 if (*output->ctrl_url != '\0') {
6dc3064a
DG
3321 ret = snapshot_output_init(output->max_size, output->name,
3322 output->ctrl_url, output->data_url, session->consumer,
e1986656 3323 &tmp_output, NULL);
6dc3064a
DG
3324 if (ret < 0) {
3325 if (ret == -ENOMEM) {
3326 ret = LTTNG_ERR_NOMEM;
3327 } else {
3328 ret = LTTNG_ERR_INVALID;
3329 }
3330 goto error;
3331 }
1bfe7328
DG
3332 /* Use the global session count for the temporary snapshot. */
3333 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
e1986656 3334 use_tmp_output = 1;
6dc3064a
DG
3335 }
3336
3337 if (session->kernel_session) {
3338 struct ltt_kernel_session *ksess = session->kernel_session;
3339
e1986656 3340 if (use_tmp_output) {
d07ceecd
MD
3341 int64_t nb_packets_per_stream;
3342
3343 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3344 tmp_output.max_size);
3345 if (nb_packets_per_stream < 0) {
3346 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3347 goto error;
3348 }
e1986656 3349 ret = record_kernel_snapshot(ksess, &tmp_output, session,
d07ceecd 3350 wait, nb_packets_per_stream);
a934f4af 3351 if (ret != LTTNG_OK) {
6dc3064a
DG
3352 goto error;
3353 }
1bfe7328 3354 snapshot_success = 1;
6dc3064a
DG
3355 } else {
3356 struct snapshot_output *sout;
3357 struct lttng_ht_iter iter;
3358
3359 rcu_read_lock();
3360 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3361 &iter.iter, sout, node.node) {
d07ceecd
MD
3362 int64_t nb_packets_per_stream;
3363
e1986656
DG
3364 /*
3365 * Make a local copy of the output and assign the possible
3366 * temporary value given by the caller.
3367 */
3368 memset(&tmp_output, 0, sizeof(tmp_output));
3369 memcpy(&tmp_output, sout, sizeof(tmp_output));
3370
e1986656
DG
3371 if (output->max_size != (uint64_t) -1ULL) {
3372 tmp_output.max_size = output->max_size;
3373 }
3374
d07ceecd
MD
3375 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3376 tmp_output.max_size);
3377 if (nb_packets_per_stream < 0) {
68808f4e
DG
3378 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3379 goto error;
3380 }
3381
e1986656
DG
3382 /* Use temporary name. */
3383 if (*output->name != '\0') {
3384 strncpy(tmp_output.name, output->name,
3385 sizeof(tmp_output.name));
3386 }
3387
1bfe7328
DG
3388 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3389
e1986656 3390 ret = record_kernel_snapshot(ksess, &tmp_output,
d07ceecd 3391 session, wait, nb_packets_per_stream);
a934f4af 3392 if (ret != LTTNG_OK) {
6dc3064a
DG
3393 rcu_read_unlock();