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Prevent the use of reserved UST event names
[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
DG		 53
54/*
55 * Create a session path used by list_lttng_sessions for the case that the
56 * session consumer is on the network.
57 */
58static int build_network_session_path(char *dst, size_t size,
59 struct ltt_session *session)
60{
61 int ret, kdata_port, udata_port;
62 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
63 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
64
65 assert(session);
66 assert(dst);
67
68 memset(tmp_urls, 0, sizeof(tmp_urls));
69 memset(tmp_uurl, 0, sizeof(tmp_uurl));
70
71 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
72
73 if (session->kernel_session && session->kernel_session->consumer) {
74 kuri = &session->kernel_session->consumer->dst.net.control;
75 kdata_port = session->kernel_session->consumer->dst.net.data.port;
76 }
77
78 if (session->ust_session && session->ust_session->consumer) {
79 uuri = &session->ust_session->consumer->dst.net.control;
80 udata_port = session->ust_session->consumer->dst.net.data.port;
81 }
82
83 if (uuri == NULL && kuri == NULL) {
84 uri = &session->consumer->dst.net.control;
85 kdata_port = session->consumer->dst.net.data.port;
86 } else if (kuri && uuri) {
87 ret = uri_compare(kuri, uuri);
88 if (ret) {
89 /* Not Equal */
90 uri = kuri;
91 /* Build uuri URL string */
92 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
93 if (ret < 0) {
94 goto error;
95 }
96 } else {
97 uri = kuri;
98 }
99 } else if (kuri && uuri == NULL) {
100 uri = kuri;
101 } else if (uuri && kuri == NULL) {
102 uri = uuri;
103 }
104
105 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
106 if (ret < 0) {
107 goto error;
108 }
109
9aa9f900
DG		 110 /*
111 * Do we have a UST url set. If yes, this means we have both kernel and UST
112 * to print.
113 */
9d035200 114 if (*tmp_uurl != '\0') {
2f77fc4b
DG		 115 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
116 tmp_urls, kdata_port, tmp_uurl, udata_port);
117 } else {
9aa9f900 118 int dport;
bef08707 119 if (kuri || (!kuri && !uuri)) {
9aa9f900
DG		 120 dport = kdata_port;
121 } else {
122 /* No kernel URI, use the UST port. */
123 dport = udata_port;
124 }
125 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
2f77fc4b
DG		 126 }
127
128error:
129 return ret;
130}
131
132/*
133 * Fill lttng_channel array of all channels.
134 */
135static void list_lttng_channels(int domain, struct ltt_session *session,
136 struct lttng_channel *channels)
137{
138 int i = 0;
139 struct ltt_kernel_channel *kchan;
140
141 DBG("Listing channels for session %s", session->name);
142
143 switch (domain) {
144 case LTTNG_DOMAIN_KERNEL:
145 /* Kernel channels */
146 if (session->kernel_session != NULL) {
147 cds_list_for_each_entry(kchan,
148 &session->kernel_session->channel_list.head, list) {
149 /* Copy lttng_channel struct to array */
150 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
151 channels[i].enabled = kchan->enabled;
152 i++;
153 }
154 }
155 break;
156 case LTTNG_DOMAIN_UST:
157 {
158 struct lttng_ht_iter iter;
159 struct ltt_ust_channel *uchan;
160
e7fe706f 161 rcu_read_lock();
2f77fc4b
DG		 162 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
163 &iter.iter, uchan, node.node) {
164 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
165 channels[i].attr.overwrite = uchan->attr.overwrite;
166 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
167 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
168 channels[i].attr.switch_timer_interval =
169 uchan->attr.switch_timer_interval;
170 channels[i].attr.read_timer_interval =
171 uchan->attr.read_timer_interval;
172 channels[i].enabled = uchan->enabled;
2f785fe7
DG		 173 channels[i].attr.tracefile_size = uchan->tracefile_size;
174 channels[i].attr.tracefile_count = uchan->tracefile_count;
2f77fc4b
DG		 175 switch (uchan->attr.output) {
176 case LTTNG_UST_MMAP:
177 default:
178 channels[i].attr.output = LTTNG_EVENT_MMAP;
179 break;
180 }
181 i++;
182 }
e7fe706f 183 rcu_read_unlock();
2f77fc4b
DG		 184 break;
185 }
186 default:
187 break;
188 }
189}
190
3c6a091f 191/*
022d91ba 192 * Create a list of agent domain events.
3c6a091f
DG		 193 *
194 * Return number of events in list on success or else a negative value.
195 */
022d91ba 196static int list_lttng_agent_events(struct agent *agt,
3c6a091f
DG		 197 struct lttng_event **events)
198{
199 int i = 0, ret = 0;
200 unsigned int nb_event = 0;
022d91ba 201 struct agent_event *event;
3c6a091f
DG		 202 struct lttng_event *tmp_events;
203 struct lttng_ht_iter iter;
204
022d91ba 205 assert(agt);
3c6a091f
DG		 206 assert(events);
207
022d91ba 208 DBG3("Listing agent events");
3c6a091f 209
e5bbf678 210 rcu_read_lock();
022d91ba 211 nb_event = lttng_ht_get_count(agt->events);
e5bbf678 212 rcu_read_unlock();
3c6a091f
DG		 213 if (nb_event == 0) {
214 ret = nb_event;
215 goto error;
216 }
217
218 tmp_events = zmalloc(nb_event * sizeof(*tmp_events));
219 if (!tmp_events) {
022d91ba 220 PERROR("zmalloc agent events session");
3c6a091f
DG		 221 ret = -LTTNG_ERR_FATAL;
222 goto error;
223 }
224
225 rcu_read_lock();
022d91ba 226 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
3c6a091f
DG		 227 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
228 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
229 tmp_events[i].enabled = event->enabled;
ff94328f
DG		 230 tmp_events[i].loglevel = event->loglevel;
231 tmp_events[i].loglevel_type = event->loglevel_type;
3c6a091f
DG		 232 i++;
233 }
234 rcu_read_unlock();
235
236 *events = tmp_events;
237 ret = nb_event;
238
239error:
240 assert(nb_event == i);
241 return ret;
242}
243
2f77fc4b
DG		 244/*
245 * Create a list of ust global domain events.
246 */
247static int list_lttng_ust_global_events(char *channel_name,
248 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
249{
250 int i = 0, ret = 0;
251 unsigned int nb_event = 0;
252 struct lttng_ht_iter iter;
253 struct lttng_ht_node_str *node;
254 struct ltt_ust_channel *uchan;
255 struct ltt_ust_event *uevent;
256 struct lttng_event *tmp;
257
258 DBG("Listing UST global events for channel %s", channel_name);
259
260 rcu_read_lock();
261
262 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
263 node = lttng_ht_iter_get_node_str(&iter);
264 if (node == NULL) {
f73fabfd 265 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG		 266 goto error;
267 }
268
269 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
270
271 nb_event += lttng_ht_get_count(uchan->events);
272
273 if (nb_event == 0) {
274 ret = nb_event;
275 goto error;
276 }
277
278 DBG3("Listing UST global %d events", nb_event);
279
280 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
281 if (tmp == NULL) {
f73fabfd 282 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 283 goto error;
284 }
285
286 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
287 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
288 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
289 tmp[i].enabled = uevent->enabled;
290
291 switch (uevent->attr.instrumentation) {
292 case LTTNG_UST_TRACEPOINT:
293 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
294 break;
295 case LTTNG_UST_PROBE:
296 tmp[i].type = LTTNG_EVENT_PROBE;
297 break;
298 case LTTNG_UST_FUNCTION:
299 tmp[i].type = LTTNG_EVENT_FUNCTION;
300 break;
301 }
302
303 tmp[i].loglevel = uevent->attr.loglevel;
304 switch (uevent->attr.loglevel_type) {
305 case LTTNG_UST_LOGLEVEL_ALL:
306 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
307 break;
308 case LTTNG_UST_LOGLEVEL_RANGE:
309 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
310 break;
311 case LTTNG_UST_LOGLEVEL_SINGLE:
312 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
313 break;
314 }
315 if (uevent->filter) {
316 tmp[i].filter = 1;
317 }
4634f12e
JI		 318 if (uevent->exclusion) {
319 tmp[i].exclusion = 1;
320 }
2f77fc4b
DG		 321 i++;
322 }
323
324 ret = nb_event;
325 *events = tmp;
326
327error:
328 rcu_read_unlock();
329 return ret;
330}
331
332/*
333 * Fill lttng_event array of all kernel events in the channel.
334 */
335static int list_lttng_kernel_events(char *channel_name,
336 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
337{
338 int i = 0, ret;
339 unsigned int nb_event;
340 struct ltt_kernel_event *event;
341 struct ltt_kernel_channel *kchan;
342
343 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
344 if (kchan == NULL) {
f73fabfd 345 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG		 346 goto error;
347 }
348
349 nb_event = kchan->event_count;
350
351 DBG("Listing events for channel %s", kchan->channel->name);
352
353 if (nb_event == 0) {
834978fd
DG		 354 *events = NULL;
355 goto syscall;
2f77fc4b
DG		 356 }
357
358 *events = zmalloc(nb_event * sizeof(struct lttng_event));
359 if (*events == NULL) {
f73fabfd 360 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 361 goto error;
362 }
363
364 /* Kernel channels */
365 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
366 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
367 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
368 (*events)[i].enabled = event->enabled;
369
370 switch (event->event->instrumentation) {
371 case LTTNG_KERNEL_TRACEPOINT:
372 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
373 break;
2f77fc4b 374 case LTTNG_KERNEL_KRETPROBE:
1896972b
DG		 375 (*events)[i].type = LTTNG_EVENT_FUNCTION;
376 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
377 sizeof(struct lttng_kernel_kprobe));
378 break;
379 case LTTNG_KERNEL_KPROBE:
2f77fc4b
DG		 380 (*events)[i].type = LTTNG_EVENT_PROBE;
381 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
382 sizeof(struct lttng_kernel_kprobe));
383 break;
384 case LTTNG_KERNEL_FUNCTION:
385 (*events)[i].type = LTTNG_EVENT_FUNCTION;
386 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
387 sizeof(struct lttng_kernel_function));
388 break;
389 case LTTNG_KERNEL_NOOP:
390 (*events)[i].type = LTTNG_EVENT_NOOP;
391 break;
392 case LTTNG_KERNEL_SYSCALL:
393 (*events)[i].type = LTTNG_EVENT_SYSCALL;
394 break;
395 case LTTNG_KERNEL_ALL:
396 assert(0);
397 break;
398 }
399 i++;
400 }
401
834978fd
DG		 402syscall:
403 if (syscall_table) {
404 ssize_t new_size;
405
406 new_size = syscall_list_channel(kchan, events, nb_event);
407 if (new_size < 0) {
408 free(events);
409 ret = -new_size;
410 goto error;
411 }
412 nb_event = new_size;
413 }
414
2f77fc4b
DG		 415 return nb_event;
416
417error:
f73fabfd
DG		 418 /* Negate the error code to differentiate the size from an error */
419 return -ret;
2f77fc4b
DG		 420}
421
422/*
423 * Add URI so the consumer output object. Set the correct path depending on the
424 * domain adding the default trace directory.
425 */
426static int add_uri_to_consumer(struct consumer_output *consumer,
427 struct lttng_uri *uri, int domain, const char *session_name)
428{
f73fabfd 429 int ret = LTTNG_OK;
2f77fc4b
DG		 430 const char *default_trace_dir;
431
432 assert(uri);
433
434 if (consumer == NULL) {
435 DBG("No consumer detected. Don't add URI. Stopping.");
f73fabfd 436 ret = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG		 437 goto error;
438 }
439
440 switch (domain) {
441 case LTTNG_DOMAIN_KERNEL:
442 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
443 break;
444 case LTTNG_DOMAIN_UST:
445 default_trace_dir = DEFAULT_UST_TRACE_DIR;
446 break;
447 default:
448 /*
449 * This case is possible is we try to add the URI to the global tracing
450 * session consumer object which in this case there is no subdir.
451 */
452 default_trace_dir = "";
453 }
454
455 switch (uri->dtype) {
456 case LTTNG_DST_IPV4:
457 case LTTNG_DST_IPV6:
458 DBG2("Setting network URI to consumer");
459
df75acac
DG		 460 if (consumer->type == CONSUMER_DST_NET) {
461 if ((uri->stype == LTTNG_STREAM_CONTROL &&
785d2d0d
DG		 462 consumer->dst.net.control_isset) ||
463 (uri->stype == LTTNG_STREAM_DATA &&
464 consumer->dst.net.data_isset)) {
df75acac
DG		 465 ret = LTTNG_ERR_URL_EXIST;
466 goto error;
467 }
468 } else {
469 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
785d2d0d
DG		 470 }
471
df75acac
DG		 472 consumer->type = CONSUMER_DST_NET;
473
2f77fc4b
DG		 474 /* Set URI into consumer output object */
475 ret = consumer_set_network_uri(consumer, uri);
476 if (ret < 0) {
a74934ba 477 ret = -ret;
2f77fc4b
DG		 478 goto error;
479 } else if (ret == 1) {
480 /*
481 * URI was the same in the consumer so we do not append the subdir
482 * again so to not duplicate output dir.
483 */
f86c9f4e 484 ret = LTTNG_OK;
2f77fc4b
DG		 485 goto error;
486 }
487
488 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
489 ret = consumer_set_subdir(consumer, session_name);
490 if (ret < 0) {
f73fabfd 491 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 492 goto error;
493 }
494 }
495
496 if (uri->stype == LTTNG_STREAM_CONTROL) {
497 /* On a new subdir, reappend the default trace dir. */
c30ce0b3
CB		 498 strncat(consumer->subdir, default_trace_dir,
499 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2f77fc4b
DG		 500 DBG3("Append domain trace name to subdir %s", consumer->subdir);
501 }
502
503 break;
504 case LTTNG_DST_PATH:
505 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
506 memset(consumer->dst.trace_path, 0,
507 sizeof(consumer->dst.trace_path));
508 strncpy(consumer->dst.trace_path, uri->dst.path,
509 sizeof(consumer->dst.trace_path));
510 /* Append default trace dir */
511 strncat(consumer->dst.trace_path, default_trace_dir,
c30ce0b3
CB		 512 sizeof(consumer->dst.trace_path) -
513 strlen(consumer->dst.trace_path) - 1);
2f77fc4b
DG		 514 /* Flag consumer as local. */
515 consumer->type = CONSUMER_DST_LOCAL;
516 break;
517 }
518
a74934ba
DG		 519 ret = LTTNG_OK;
520
2f77fc4b
DG		 521error:
522 return ret;
523}
524
525/*
526 * Init tracing by creating trace directory and sending fds kernel consumer.
527 */
528static int init_kernel_tracing(struct ltt_kernel_session *session)
529{
530 int ret = 0;
531 struct lttng_ht_iter iter;
532 struct consumer_socket *socket;
533
534 assert(session);
535
e7fe706f
DG		 536 rcu_read_lock();
537
2f77fc4b
DG		 538 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
539 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
540 socket, node.node) {
2f77fc4b 541 pthread_mutex_lock(socket->lock);
f50f23d9 542 ret = kernel_consumer_send_session(socket, session);
2f77fc4b
DG		 543 pthread_mutex_unlock(socket->lock);
544 if (ret < 0) {
f73fabfd 545 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG		 546 goto error;
547 }
548 }
549 }
550
551error:
e7fe706f 552 rcu_read_unlock();
2f77fc4b
DG		 553 return ret;
554}
555
556/*
557 * Create a socket to the relayd using the URI.
558 *
559 * On success, the relayd_sock pointer is set to the created socket.
560 * Else, it's stays untouched and a lttcomm error code is returned.
561 */
6151a90f
JD		 562static int create_connect_relayd(struct lttng_uri *uri,
563 struct lttcomm_relayd_sock **relayd_sock)
2f77fc4b
DG		 564{
565 int ret;
6151a90f 566 struct lttcomm_relayd_sock *rsock;
2f77fc4b 567
6151a90f
JD		 568 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
569 RELAYD_VERSION_COMM_MINOR);
570 if (!rsock) {
f73fabfd 571 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 572 goto error;
573 }
574
ffe60014
DG		 575 /*
576 * Connect to relayd so we can proceed with a session creation. This call
577 * can possibly block for an arbitrary amount of time to set the health
578 * state to be in poll execution.
579 */
580 health_poll_entry();
6151a90f 581 ret = relayd_connect(rsock);
ffe60014 582 health_poll_exit();
2f77fc4b
DG		 583 if (ret < 0) {
584 ERR("Unable to reach lttng-relayd");
f73fabfd 585 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG		 586 goto free_sock;
587 }
588
589 /* Create socket for control stream. */
590 if (uri->stype == LTTNG_STREAM_CONTROL) {
591 DBG3("Creating relayd stream socket from URI");
592
593 /* Check relayd version */
6151a90f 594 ret = relayd_version_check(rsock);
2f77fc4b 595 if (ret < 0) {
f73fabfd 596 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
2f77fc4b
DG		 597 goto close_sock;
598 }
599 } else if (uri->stype == LTTNG_STREAM_DATA) {
600 DBG3("Creating relayd data socket from URI");
601 } else {
602 /* Command is not valid */
603 ERR("Relayd invalid stream type: %d", uri->stype);
f73fabfd 604 ret = LTTNG_ERR_INVALID;
2f77fc4b
DG		 605 goto close_sock;
606 }
607
6151a90f 608 *relayd_sock = rsock;
2f77fc4b 609
f73fabfd 610 return LTTNG_OK;
2f77fc4b
DG		 611
612close_sock:
6151a90f
JD		 613 /* The returned value is not useful since we are on an error path. */
614 (void) relayd_close(rsock);
2f77fc4b 615free_sock:
6151a90f 616 free(rsock);
2f77fc4b
DG		 617error:
618 return ret;
619}
620
621/*
622 * Connect to the relayd using URI and send the socket to the right consumer.
623 */
6dc3064a 624static int send_consumer_relayd_socket(int domain, unsigned int session_id,
2f77fc4b 625 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
d3e2ba59
JD		 626 struct consumer_socket *consumer_sock,
627 char *session_name, char *hostname, int session_live_timer)
2f77fc4b
DG		 628{
629 int ret;
6151a90f 630 struct lttcomm_relayd_sock *rsock = NULL;
2f77fc4b 631
ffe60014 632 /* Connect to relayd and make version check if uri is the control. */
6151a90f 633 ret = create_connect_relayd(relayd_uri, &rsock);
ffe60014 634 if (ret != LTTNG_OK) {
6151a90f 635 goto error;
ffe60014 636 }
6151a90f 637 assert(rsock);
ffe60014 638
2f77fc4b 639 /* Set the network sequence index if not set. */
d88aee68
DG		 640 if (consumer->net_seq_index == (uint64_t) -1ULL) {
641 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2f77fc4b
DG		 642 /*
643 * Increment net_seq_idx because we are about to transfer the
644 * new relayd socket to the consumer.
d88aee68 645 * Assign unique key so the consumer can match streams.
2f77fc4b 646 */
d88aee68
DG		 647 consumer->net_seq_index = ++relayd_net_seq_idx;
648 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG		 649 }
650
2f77fc4b 651 /* Send relayd socket to consumer. */
6151a90f 652 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
d3e2ba59
JD		 653 relayd_uri->stype, session_id,
654 session_name, hostname, session_live_timer);
2f77fc4b 655 if (ret < 0) {
f73fabfd 656 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG		 657 goto close_sock;
658 }
659
c890b720
DG		 660 /* Flag that the corresponding socket was sent. */
661 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
ffe60014 662 consumer_sock->control_sock_sent = 1;
c890b720 663 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
ffe60014 664 consumer_sock->data_sock_sent = 1;
c890b720
DG		 665 }
666
f73fabfd 667 ret = LTTNG_OK;
2f77fc4b
DG		 668
669 /*
670 * Close socket which was dup on the consumer side. The session daemon does
671 * NOT keep track of the relayd socket(s) once transfer to the consumer.
672 */
673
674close_sock:
6151a90f
JD		 675 (void) relayd_close(rsock);
676 free(rsock);
2f77fc4b 677
6151a90f 678error:
ffe60014
DG		 679 if (ret != LTTNG_OK) {
680 /*
d9078d0c
DG		 681 * The consumer output for this session should not be used anymore
682 * since the relayd connection failed thus making any tracing or/and
683 * streaming not usable.
ffe60014 684 */
d9078d0c 685 consumer->enabled = 0;
ffe60014 686 }
2f77fc4b
DG		 687 return ret;
688}
689
690/*
691 * Send both relayd sockets to a specific consumer and domain. This is a
692 * helper function to facilitate sending the information to the consumer for a
693 * session.
694 */
6dc3064a 695static int send_consumer_relayd_sockets(int domain, unsigned int session_id,
d3e2ba59
JD		 696 struct consumer_output *consumer, struct consumer_socket *sock,
697 char *session_name, char *hostname, int session_live_timer)
2f77fc4b 698{
dda67f6c 699 int ret = LTTNG_OK;
2f77fc4b 700
2f77fc4b 701 assert(consumer);
6dc3064a 702 assert(sock);
2f77fc4b 703
2f77fc4b 704 /* Sending control relayd socket. */
ffe60014 705 if (!sock->control_sock_sent) {
6dc3064a 706 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD		 707 &consumer->dst.net.control, consumer, sock,
708 session_name, hostname, session_live_timer);
c890b720
DG		 709 if (ret != LTTNG_OK) {
710 goto error;
711 }
2f77fc4b
DG		 712 }
713
714 /* Sending data relayd socket. */
ffe60014 715 if (!sock->data_sock_sent) {
6dc3064a 716 ret = send_consumer_relayd_socket(domain, session_id,
d3e2ba59
JD		 717 &consumer->dst.net.data, consumer, sock,
718 session_name, hostname, session_live_timer);
c890b720
DG		 719 if (ret != LTTNG_OK) {
720 goto error;
721 }
2f77fc4b
DG		 722 }
723
2f77fc4b
DG		 724error:
725 return ret;
726}
727
728/*
729 * Setup relayd connections for a tracing session. First creates the socket to
730 * the relayd and send them to the right domain consumer. Consumer type MUST be
731 * network.
732 */
ffe60014 733int cmd_setup_relayd(struct ltt_session *session)
2f77fc4b 734{
f73fabfd 735 int ret = LTTNG_OK;
2f77fc4b
DG		 736 struct ltt_ust_session *usess;
737 struct ltt_kernel_session *ksess;
738 struct consumer_socket *socket;
739 struct lttng_ht_iter iter;
740
741 assert(session);
742
743 usess = session->ust_session;
744 ksess = session->kernel_session;
745
785d2d0d 746 DBG("Setting relayd for session %s", session->name);
2f77fc4b 747
e7fe706f
DG		 748 rcu_read_lock();
749
2f77fc4b
DG		 750 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
751 && usess->consumer->enabled) {
752 /* For each consumer socket, send relayd sockets */
753 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
754 socket, node.node) {
2f77fc4b 755 pthread_mutex_lock(socket->lock);
6dc3064a 756 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
d3e2ba59
JD		 757 usess->consumer, socket,
758 session->name, session->hostname,
759 session->live_timer);
2f77fc4b 760 pthread_mutex_unlock(socket->lock);
f73fabfd 761 if (ret != LTTNG_OK) {
2f77fc4b
DG		 762 goto error;
763 }
6dc3064a
DG		 764 /* Session is now ready for network streaming. */
765 session->net_handle = 1;
2f77fc4b
DG		 766 }
767 }
768
769 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
770 && ksess->consumer->enabled) {
771 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
772 socket, node.node) {
2f77fc4b 773 pthread_mutex_lock(socket->lock);
6dc3064a 774 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
d3e2ba59
JD		 775 ksess->consumer, socket,
776 session->name, session->hostname,
777 session->live_timer);
2f77fc4b 778 pthread_mutex_unlock(socket->lock);
f73fabfd 779 if (ret != LTTNG_OK) {
2f77fc4b
DG		 780 goto error;
781 }
6dc3064a
DG		 782 /* Session is now ready for network streaming. */
783 session->net_handle = 1;
2f77fc4b
DG		 784 }
785 }
786
787error:
e7fe706f 788 rcu_read_unlock();
2f77fc4b
DG		 789 return ret;
790}
791
9b6c7ec5
DG		 792/*
793 * Start a kernel session by opening all necessary streams.
794 */
795static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
796{
797 int ret;
798 struct ltt_kernel_channel *kchan;
799
800 /* Open kernel metadata */
07b86b52 801 if (ksess->metadata == NULL && ksess->output_traces) {
9b6c7ec5
DG		 802 ret = kernel_open_metadata(ksess);
803 if (ret < 0) {
804 ret = LTTNG_ERR_KERN_META_FAIL;
805 goto error;
806 }
807 }
808
809 /* Open kernel metadata stream */
07b86b52 810 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
9b6c7ec5
DG		 811 ret = kernel_open_metadata_stream(ksess);
812 if (ret < 0) {
813 ERR("Kernel create metadata stream failed");
814 ret = LTTNG_ERR_KERN_STREAM_FAIL;
815 goto error;
816 }
817 }
818
819 /* For each channel */
820 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
821 if (kchan->stream_count == 0) {
822 ret = kernel_open_channel_stream(kchan);
823 if (ret < 0) {
824 ret = LTTNG_ERR_KERN_STREAM_FAIL;
825 goto error;
826 }
827 /* Update the stream global counter */
828 ksess->stream_count_global += ret;
829 }
830 }
831
832 /* Setup kernel consumer socket and send fds to it */
833 ret = init_kernel_tracing(ksess);
e43c41c5 834 if (ret != 0) {
9b6c7ec5
DG		 835 ret = LTTNG_ERR_KERN_START_FAIL;
836 goto error;
837 }
838
839 /* This start the kernel tracing */
840 ret = kernel_start_session(ksess);
841 if (ret < 0) {
842 ret = LTTNG_ERR_KERN_START_FAIL;
843 goto error;
844 }
845
846 /* Quiescent wait after starting trace */
784303b0 847 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5 848
14fb1ebe 849 ksess->active = 1;
9b6c7ec5
DG		 850
851 ret = LTTNG_OK;
852
853error:
854 return ret;
855}
856
2f77fc4b
DG		 857/*
858 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
859 */
860int cmd_disable_channel(struct ltt_session *session, int domain,
861 char *channel_name)
862{
863 int ret;
864 struct ltt_ust_session *usess;
865
866 usess = session->ust_session;
867
2223c96f
DG		 868 rcu_read_lock();
869
2f77fc4b
DG		 870 switch (domain) {
871 case LTTNG_DOMAIN_KERNEL:
872 {
873 ret = channel_kernel_disable(session->kernel_session,
874 channel_name);
f73fabfd 875 if (ret != LTTNG_OK) {
2f77fc4b
DG		 876 goto error;
877 }
878
879 kernel_wait_quiescent(kernel_tracer_fd);
880 break;
881 }
882 case LTTNG_DOMAIN_UST:
883 {
884 struct ltt_ust_channel *uchan;
885 struct lttng_ht *chan_ht;
886
887 chan_ht = usess->domain_global.channels;
888
889 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
890 if (uchan == NULL) {
f73fabfd 891 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG		 892 goto error;
893 }
894
7972aab2 895 ret = channel_ust_disable(usess, uchan);
f73fabfd 896 if (ret != LTTNG_OK) {
2f77fc4b
DG		 897 goto error;
898 }
899 break;
900 }
2f77fc4b 901 default:
f73fabfd 902 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG		 903 goto error;
904 }
905
f73fabfd 906 ret = LTTNG_OK;
2f77fc4b
DG		 907
908error:
2223c96f 909 rcu_read_unlock();
2f77fc4b
DG		 910 return ret;
911}
912
ccf10263
MD		 913/*
914 * Command LTTNG_TRACK_PID processed by the client thread.
a9ad0c8f
MD		 915 *
916 * Called with session lock held.
ccf10263
MD		 917 */
918int cmd_track_pid(struct ltt_session *session, int domain, int pid)
919{
920 int ret;
921
922 rcu_read_lock();
923
924 switch (domain) {
925 case LTTNG_DOMAIN_KERNEL:
926 {
927 struct ltt_kernel_session *ksess;
928
929 ksess = session->kernel_session;
930
931 ret = kernel_track_pid(ksess, pid);
932 if (ret != LTTNG_OK) {
933 goto error;
934 }
935
936 kernel_wait_quiescent(kernel_tracer_fd);
937 break;
938 }
ccf10263 939 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD		 940 {
941 struct ltt_ust_session *usess;
942
943 usess = session->ust_session;
944
945 ret = trace_ust_track_pid(usess, pid);
946 if (ret != LTTNG_OK) {
947 goto error;
948 }
949 break;
950 }
ccf10263
MD		 951 default:
952 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
953 goto error;
954 }
955
956 ret = LTTNG_OK;
957
958error:
959 rcu_read_unlock();
960 return ret;
961}
962
963/*
964 * Command LTTNG_UNTRACK_PID processed by the client thread.
a9ad0c8f
MD		 965 *
966 * Called with session lock held.
ccf10263
MD		 967 */
968int cmd_untrack_pid(struct ltt_session *session, int domain, int pid)
969{
970 int ret;
971
972 rcu_read_lock();
973
974 switch (domain) {
975 case LTTNG_DOMAIN_KERNEL:
976 {
977 struct ltt_kernel_session *ksess;
978
979 ksess = session->kernel_session;
980
981 ret = kernel_untrack_pid(ksess, pid);
982 if (ret != LTTNG_OK) {
983 goto error;
984 }
985
986 kernel_wait_quiescent(kernel_tracer_fd);
987 break;
988 }
ccf10263 989 case LTTNG_DOMAIN_UST:
a9ad0c8f
MD		 990 {
991 struct ltt_ust_session *usess;
992
993 usess = session->ust_session;
994
995 ret = trace_ust_untrack_pid(usess, pid);
996 if (ret != LTTNG_OK) {
997 goto error;
998 }
999 break;
1000 }
ccf10263
MD		 1001 default:
1002 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1003 goto error;
1004 }
1005
1006 ret = LTTNG_OK;
1007
1008error:
1009 rcu_read_unlock();
1010 return ret;
1011}
1012
2f77fc4b
DG		 1013/*
1014 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1015 *
1016 * The wpipe arguments is used as a notifier for the kernel thread.
1017 */
1018int cmd_enable_channel(struct ltt_session *session,
7972aab2 1019 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
2f77fc4b
DG		 1020{
1021 int ret;
1022 struct ltt_ust_session *usess = session->ust_session;
1023 struct lttng_ht *chan_ht;
1f345e94 1024 size_t len;
2f77fc4b
DG		 1025
1026 assert(session);
1027 assert(attr);
7972aab2 1028 assert(domain);
2f77fc4b 1029
1f345e94
PP		 1030 len = strnlen(attr->name, sizeof(attr->name));
1031
1032 /* Validate channel name */
1033 if (attr->name[0] == '.' ||
1034 memchr(attr->name, '/', len) != NULL) {
1035 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1036 goto end;
1037 }
1038
2f77fc4b
DG		 1039 DBG("Enabling channel %s for session %s", attr->name, session->name);
1040
03b4fdcf
DG		 1041 rcu_read_lock();
1042
ecc48a90
JD		 1043 /*
1044 * Don't try to enable a channel if the session has been started at
1045 * some point in time before. The tracer does not allow it.
1046 */
8382cf6f 1047 if (session->has_been_started) {
ecc48a90
JD		 1048 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1049 goto error;
1050 }
1051
1052 /*
1053 * If the session is a live session, remove the switch timer, the
1054 * live timer does the same thing but sends also synchronisation
1055 * beacons for inactive streams.
1056 */
1057 if (session->live_timer > 0) {
1058 attr->attr.live_timer_interval = session->live_timer;
1059 attr->attr.switch_timer_interval = 0;
1060 }
1061
33fbd469
DG		 1062 /*
1063 * The ringbuffer (both in user space and kernel) behave badly in overwrite
1064 * mode and with less than 2 subbuf so block it right away and send back an
1065 * invalid attribute error.
1066 */
1067 if (attr->attr.overwrite && attr->attr.num_subbuf < 2) {
1068 ret = LTTNG_ERR_INVALID;
1069 goto error;
1070 }
1071
7972aab2 1072 switch (domain->type) {
2f77fc4b
DG		 1073 case LTTNG_DOMAIN_KERNEL:
1074 {
1075 struct ltt_kernel_channel *kchan;
1076
2f77fc4b
DG		 1077 kchan = trace_kernel_get_channel_by_name(attr->name,
1078 session->kernel_session);
1079 if (kchan == NULL) {
1080 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
85076754
MD		 1081 if (attr->name[0] != '\0') {
1082 session->kernel_session->has_non_default_channel = 1;
1083 }
2f77fc4b
DG		 1084 } else {
1085 ret = channel_kernel_enable(session->kernel_session, kchan);
1086 }
1087
f73fabfd 1088 if (ret != LTTNG_OK) {
2f77fc4b
DG		 1089 goto error;
1090 }
1091
784303b0 1092 kernel_wait_quiescent(kernel_tracer_fd);
2f77fc4b
DG		 1093 break;
1094 }
1095 case LTTNG_DOMAIN_UST:
1096 {
1097 struct ltt_ust_channel *uchan;
1098
1099 chan_ht = usess->domain_global.channels;
1100
1101 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1102 if (uchan == NULL) {
7972aab2 1103 ret = channel_ust_create(usess, attr, domain->buf_type);
85076754
MD		 1104 if (attr->name[0] != '\0') {
1105 usess->has_non_default_channel = 1;
1106 }
2f77fc4b 1107 } else {
7972aab2 1108 ret = channel_ust_enable(usess, uchan);
2f77fc4b
DG		 1109 }
1110 break;
1111 }
2f77fc4b 1112 default:
f73fabfd 1113 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG		 1114 goto error;
1115 }
1116
1117error:
2223c96f 1118 rcu_read_unlock();
1f345e94 1119end:
2f77fc4b
DG		 1120 return ret;
1121}
1122
2f77fc4b
DG		 1123/*
1124 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1125 */
1126int cmd_disable_event(struct ltt_session *session, int domain,
6e911cad
MD		 1127 char *channel_name,
1128 struct lttng_event *event)
2f77fc4b
DG		 1129{
1130 int ret;
6e911cad
MD		 1131 char *event_name;
1132
18a720cd
MD		 1133 DBG("Disable event command for event \'%s\'", event->name);
1134
6e911cad
MD		 1135 event_name = event->name;
1136
9b7431cf
JG		 1137 /* Error out on unhandled search criteria */
1138 if (event->loglevel_type || event->loglevel != -1 || event->enabled
6e911cad
MD		 1139 || event->pid || event->filter || event->exclusion) {
1140 return LTTNG_ERR_UNK;
1141 }
2f77fc4b 1142
2223c96f
DG		 1143 rcu_read_lock();
1144
2f77fc4b
DG		 1145 switch (domain) {
1146 case LTTNG_DOMAIN_KERNEL:
1147 {
1148 struct ltt_kernel_channel *kchan;
1149 struct ltt_kernel_session *ksess;
1150
1151 ksess = session->kernel_session;
1152
85076754
MD		 1153 /*
1154 * If a non-default channel has been created in the
1155 * session, explicitely require that -c chan_name needs
1156 * to be provided.
1157 */
1158 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1159 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1160 goto error;
1161 }
1162
2f77fc4b
DG		 1163 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1164 if (kchan == NULL) {
f73fabfd 1165 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG		 1166 goto error;
1167 }
1168
6e911cad
MD		 1169 switch (event->type) {
1170 case LTTNG_EVENT_ALL:
d0ae4ea8 1171 ret = event_kernel_disable_event_all(kchan);
29c62722
MD		 1172 if (ret != LTTNG_OK) {
1173 goto error;
1174 }
1175 break;
d0ae4ea8
MD		 1176 case LTTNG_EVENT_TRACEPOINT: /* fall-through */
1177 case LTTNG_EVENT_SYSCALL:
29c62722 1178 if (!strcmp(event_name, "*")) {
d0ae4ea8
MD		 1179 ret = event_kernel_disable_event_type(kchan,
1180 event->type);
29c62722 1181 } else {
d0ae4ea8
MD		 1182 ret = event_kernel_disable_event(kchan,
1183 event_name);
29c62722 1184 }
6e911cad
MD		 1185 if (ret != LTTNG_OK) {
1186 goto error;
1187 }
1188 break;
d0ae4ea8
MD		 1189 case LTTNG_EVENT_PROBE:
1190 case LTTNG_EVENT_FUNCTION:
1191 case LTTNG_EVENT_FUNCTION_ENTRY:
1192 ret = event_kernel_disable_event(kchan, event_name);
e2b957af
MD		 1193 if (ret != LTTNG_OK) {
1194 goto error;
1195 }
6e911cad
MD		 1196 break;
1197 default:
1198 ret = LTTNG_ERR_UNK;
2f77fc4b
DG		 1199 goto error;
1200 }
1201
1202 kernel_wait_quiescent(kernel_tracer_fd);
1203 break;
1204 }
1205 case LTTNG_DOMAIN_UST:
1206 {
1207 struct ltt_ust_channel *uchan;
1208 struct ltt_ust_session *usess;
1209
1210 usess = session->ust_session;
1211
85076754
MD		 1212 /*
1213 * If a non-default channel has been created in the
1214 * session, explicitely require that -c chan_name needs
1215 * to be provided.
1216 */
1217 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1218 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1219 goto error;
1220 }
1221
2f77fc4b
DG		 1222 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1223 channel_name);
1224 if (uchan == NULL) {
f73fabfd 1225 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG		 1226 goto error;
1227 }
1228
6e911cad
MD		 1229 switch (event->type) {
1230 case LTTNG_EVENT_ALL:
1231 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
1232 if (ret != LTTNG_OK) {
1233 goto error;
1234 }
1235 break;
1236 default:
1237 ret = LTTNG_ERR_UNK;
2f77fc4b
DG		 1238 goto error;
1239 }
1240
1241 DBG3("Disable UST event %s in channel %s completed", event_name,
1242 channel_name);
1243 break;
1244 }
5cdb6027 1245 case LTTNG_DOMAIN_LOG4J:
f20baf8e 1246 case LTTNG_DOMAIN_JUL:
0e115563 1247 case LTTNG_DOMAIN_PYTHON:
f20baf8e 1248 {
fefd409b 1249 struct agent *agt;
f20baf8e
DG		 1250 struct ltt_ust_session *usess = session->ust_session;
1251
1252 assert(usess);
1253
6e911cad
MD		 1254 switch (event->type) {
1255 case LTTNG_EVENT_ALL:
1256 break;
1257 default:
1258 ret = LTTNG_ERR_UNK;
1259 goto error;
1260 }
1261
5cdb6027 1262 agt = trace_ust_find_agent(usess, domain);
fefd409b
DG		 1263 if (!agt) {
1264 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
1265 goto error;
1266 }
18a720cd
MD		 1267 /* The wild card * means that everything should be disabled. */
1268 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1269 ret = event_agent_disable_all(usess, agt);
1270 } else {
1271 ret = event_agent_disable(usess, agt, event_name);
1272 }
f20baf8e
DG		 1273 if (ret != LTTNG_OK) {
1274 goto error;
1275 }
1276
1277 break;
1278 }
2f77fc4b 1279 default:
f73fabfd 1280 ret = LTTNG_ERR_UND;
2f77fc4b
DG		 1281 goto error;
1282 }
1283
f73fabfd 1284 ret = LTTNG_OK;
2f77fc4b
DG		 1285
1286error:
2223c96f 1287 rcu_read_unlock();
2f77fc4b
DG		 1288 return ret;
1289}
1290
2f77fc4b
DG		 1291/*
1292 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1293 */
1294int cmd_add_context(struct ltt_session *session, int domain,
601d5acf 1295 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
2f77fc4b 1296{
d5979e4a 1297 int ret, chan_kern_created = 0, chan_ust_created = 0;
2f77fc4b
DG		 1298
1299 switch (domain) {
1300 case LTTNG_DOMAIN_KERNEL:
979e618e
DG		 1301 assert(session->kernel_session);
1302
1303 if (session->kernel_session->channel_count == 0) {
1304 /* Create default channel */
1305 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1306 if (ret != LTTNG_OK) {
1307 goto error;
1308 }
d5979e4a 1309 chan_kern_created = 1;
979e618e 1310 }
2f77fc4b 1311 /* Add kernel context to kernel tracer */
601d5acf 1312 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
f73fabfd 1313 if (ret != LTTNG_OK) {
2f77fc4b
DG		 1314 goto error;
1315 }
1316 break;
1317 case LTTNG_DOMAIN_UST:
1318 {
1319 struct ltt_ust_session *usess = session->ust_session;
85076754
MD		 1320 unsigned int chan_count;
1321
2f77fc4b
DG		 1322 assert(usess);
1323
85076754 1324 chan_count = lttng_ht_get_count(usess->domain_global.channels);
979e618e
DG		 1325 if (chan_count == 0) {
1326 struct lttng_channel *attr;
1327 /* Create default channel */
0a9c6494 1328 attr = channel_new_default_attr(domain, usess->buffer_type);
979e618e
DG		 1329 if (attr == NULL) {
1330 ret = LTTNG_ERR_FATAL;
1331 goto error;
1332 }
1333
7972aab2 1334 ret = channel_ust_create(usess, attr, usess->buffer_type);
979e618e
DG		 1335 if (ret != LTTNG_OK) {
1336 free(attr);
1337 goto error;
1338 }
1339 free(attr);
d5979e4a 1340 chan_ust_created = 1;
979e618e
DG		 1341 }
1342
601d5acf 1343 ret = context_ust_add(usess, domain, ctx, channel_name);
f73fabfd 1344 if (ret != LTTNG_OK) {
2f77fc4b
DG		 1345 goto error;
1346 }
1347 break;
1348 }
2f77fc4b 1349 default:
f73fabfd 1350 ret = LTTNG_ERR_UND;
2f77fc4b
DG		 1351 goto error;
1352 }
1353
d5979e4a 1354 return LTTNG_OK;
2f77fc4b
DG		 1355
1356error:
d5979e4a
DG		 1357 if (chan_kern_created) {
1358 struct ltt_kernel_channel *kchan =
1359 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1360 session->kernel_session);
1361 /* Created previously, this should NOT fail. */
1362 assert(kchan);
1363 kernel_destroy_channel(kchan);
1364 }
1365
1366 if (chan_ust_created) {
1367 struct ltt_ust_channel *uchan =
1368 trace_ust_find_channel_by_name(
1369 session->ust_session->domain_global.channels,
1370 DEFAULT_CHANNEL_NAME);
1371 /* Created previously, this should NOT fail. */
1372 assert(uchan);
1373 /* Remove from the channel list of the session. */
1374 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1375 uchan);
1376 trace_ust_destroy_channel(uchan);
1377 }
2f77fc4b
DG		 1378 return ret;
1379}
1380
930a2e99
JG		 1381static int validate_event_name(const char *name)
1382{
1383 int ret = 0;
1384 const char *c = name;
1385 const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN;
bf9807db 1386 bool null_terminated = false;
930a2e99
JG		 1387
1388 /*
1389 * Make sure that unescaped wildcards are only used as the last
1390 * character of the event name.
1391 */
1392 while (c < event_name_end) {
1393 switch (*c) {
1394 case '\0':
bf9807db 1395 null_terminated = true;
930a2e99
JG		 1396 goto end;
1397 case '\\':
1398 c++;
1399 break;
1400 case '*':
1401 if ((c + 1) < event_name_end && *(c + 1)) {
1402 /* Wildcard is not the last character */
1403 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1404 goto end;
1405 }
1406 default:
1407 break;
1408 }
1409 c++;
1410 }
1411end:
bf9807db
JG		 1412 if (!ret && !null_terminated) {
1413 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1414 }
930a2e99
JG		 1415 return ret;
1416}
1417
dac8e046
JG		 1418static inline bool name_starts_with(const char *name, const char *prefix)
1419{
1420 const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
1421
1422 return !strncmp(name, prefix, max_cmp_len);
1423}
1424
1425/* Perform userspace-specific event name validation */
1426static int validate_ust_event_name(const char *name)
1427{
1428 int ret = 0;
1429
1430 if (!name) {
1431 ret = -1;
1432 goto end;
1433 }
1434
1435 /*
1436 * Check name against all internal UST event component namespaces used
1437 * by the agents.
1438 */
1439 if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) ||
1440 name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) ||
1441 name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) {
1442 ret = -1;
1443 }
1444
1445end:
1446 return ret;
1447}
88f06f15
JG		 1448
1449static int cmd_enable_event_internal(struct ltt_session *session,
1450 struct lttng_domain *domain,
1451 char *channel_name, struct lttng_event *event,
1452 char *filter_expression,
1453 struct lttng_filter_bytecode *filter,
1454 struct lttng_event_exclusion *exclusion,
1455 int wpipe);
1456
2f77fc4b 1457/*
88f06f15
JG		 1458 * Internal version of cmd_enable_event() with a supplemental
1459 * "internal_event" flag which is used to enable internal events which should
1460 * be hidden from clients. Such events are used in the agent implementation to
1461 * enable the events through which all "agent" events are funeled.
2f77fc4b 1462 */
88f06f15
JG		 1463static int _cmd_enable_event(struct ltt_session *session,
1464 struct lttng_domain *domain,
025faf73 1465 char *channel_name, struct lttng_event *event,
6b453b5e 1466 char *filter_expression,
db8f1377
JI		 1467 struct lttng_filter_bytecode *filter,
1468 struct lttng_event_exclusion *exclusion,
88f06f15 1469 int wpipe, bool internal_event)
2f77fc4b 1470{
e5f5db7f 1471 int ret, channel_created = 0;
2f77fc4b
DG		 1472 struct lttng_channel *attr;
1473
1474 assert(session);
1475 assert(event);
1476 assert(channel_name);
1477
18a720cd
MD		 1478 DBG("Enable event command for event \'%s\'", event->name);
1479
930a2e99
JG		 1480 ret = validate_event_name(event->name);
1481 if (ret) {
1482 goto error;
1483 }
1484
2223c96f
DG		 1485 rcu_read_lock();
1486
7972aab2 1487 switch (domain->type) {
2f77fc4b
DG		 1488 case LTTNG_DOMAIN_KERNEL:
1489 {
1490 struct ltt_kernel_channel *kchan;
1491
85076754
MD		 1492 /*
1493 * If a non-default channel has been created in the
1494 * session, explicitely require that -c chan_name needs
1495 * to be provided.
1496 */
1497 if (session->kernel_session->has_non_default_channel
1498 && channel_name[0] == '\0') {
1499 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1500 goto error;
1501 }
1502
2f77fc4b
DG		 1503 kchan = trace_kernel_get_channel_by_name(channel_name,
1504 session->kernel_session);
1505 if (kchan == NULL) {
0a9c6494
DG		 1506 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1507 LTTNG_BUFFER_GLOBAL);
2f77fc4b 1508 if (attr == NULL) {
f73fabfd 1509 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 1510 goto error;
1511 }
1512 strncpy(attr->name, channel_name, sizeof(attr->name));
1513
1514 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1515 if (ret != LTTNG_OK) {
2f77fc4b
DG		 1516 free(attr);
1517 goto error;
1518 }
1519 free(attr);
e5f5db7f
DG		 1520
1521 channel_created = 1;
2f77fc4b
DG		 1522 }
1523
1524 /* Get the newly created kernel channel pointer */
1525 kchan = trace_kernel_get_channel_by_name(channel_name,
1526 session->kernel_session);
1527 if (kchan == NULL) {
1528 /* This sould not happen... */
f73fabfd 1529 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 1530 goto error;
1531 }
1532
6e911cad
MD		 1533 switch (event->type) {
1534 case LTTNG_EVENT_ALL:
29c62722 1535 {
00a62084
MD		 1536 char *filter_expression_a = NULL;
1537 struct lttng_filter_bytecode *filter_a = NULL;
1538
1539 /*
1540 * We need to duplicate filter_expression and filter,
1541 * because ownership is passed to first enable
1542 * event.
1543 */
1544 if (filter_expression) {
1545 filter_expression_a = strdup(filter_expression);
1546 if (!filter_expression_a) {
1547 ret = LTTNG_ERR_FATAL;
1548 goto error;
1549 }
1550 }
1551 if (filter) {
1552 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
1553 if (!filter_a) {
1554 free(filter_expression_a);
1555 ret = LTTNG_ERR_FATAL;
1556 goto error;
1557 }
1558 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
1559 }
29c62722 1560 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
00a62084
MD		 1561 ret = event_kernel_enable_event(kchan, event,
1562 filter_expression, filter);
a969e101
MD		 1563 /* We have passed ownership */
1564 filter_expression = NULL;
1565 filter = NULL;
29c62722
MD		 1566 if (ret != LTTNG_OK) {
1567 if (channel_created) {
1568 /* Let's not leak a useless channel. */
1569 kernel_destroy_channel(kchan);
1570 }
00a62084
MD		 1571 free(filter_expression_a);
1572 free(filter_a);
29c62722
MD		 1573 goto error;
1574 }
1575 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
00a62084
MD		 1576 ret = event_kernel_enable_event(kchan, event,
1577 filter_expression_a, filter_a);
29c62722 1578 if (ret != LTTNG_OK) {
00a62084
MD		 1579 free(filter_expression_a);
1580 free(filter_a);
29c62722
MD		 1581 goto error;
1582 }
1583 break;
1584 }
6e6ef3d7
DG		 1585 case LTTNG_EVENT_PROBE:
1586 case LTTNG_EVENT_FUNCTION:
1587 case LTTNG_EVENT_FUNCTION_ENTRY:
6e911cad 1588 case LTTNG_EVENT_TRACEPOINT:
00a62084
MD		 1589 ret = event_kernel_enable_event(kchan, event,
1590 filter_expression, filter);
a969e101
MD		 1591 /* We have passed ownership */
1592 filter_expression = NULL;
1593 filter = NULL;
6e911cad
MD		 1594 if (ret != LTTNG_OK) {
1595 if (channel_created) {
1596 /* Let's not leak a useless channel. */
1597 kernel_destroy_channel(kchan);
1598 }
1599 goto error;
e5f5db7f 1600 }
6e911cad
MD		 1601 break;
1602 case LTTNG_EVENT_SYSCALL:
00a62084
MD		 1603 ret = event_kernel_enable_event(kchan, event,
1604 filter_expression, filter);
a969e101
MD		 1605 /* We have passed ownership */
1606 filter_expression = NULL;
1607 filter = NULL;
e2b957af
MD		 1608 if (ret != LTTNG_OK) {
1609 goto error;
1610 }
6e911cad
MD		 1611 break;
1612 default:
1613 ret = LTTNG_ERR_UNK;
2f77fc4b
DG		 1614 goto error;
1615 }
1616
1617 kernel_wait_quiescent(kernel_tracer_fd);
1618 break;
1619 }
1620 case LTTNG_DOMAIN_UST:
1621 {
1622 struct ltt_ust_channel *uchan;
1623 struct ltt_ust_session *usess = session->ust_session;
1624
1625 assert(usess);
1626
85076754
MD		 1627 /*
1628 * If a non-default channel has been created in the
1629 * session, explicitely require that -c chan_name needs
1630 * to be provided.
1631 */
1632 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1633 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1634 goto error;
1635 }
1636
2f77fc4b
DG		 1637 /* Get channel from global UST domain */
1638 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1639 channel_name);
1640 if (uchan == NULL) {
1641 /* Create default channel */
0a9c6494
DG		 1642 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1643 usess->buffer_type);
2f77fc4b 1644 if (attr == NULL) {
f73fabfd 1645 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 1646 goto error;
1647 }
1648 strncpy(attr->name, channel_name, sizeof(attr->name));
1649
1650 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 1651 if (ret != LTTNG_OK) {
2f77fc4b
DG		 1652 free(attr);
1653 goto error;
1654 }
1655 free(attr);
1656
1657 /* Get the newly created channel reference back */
1658 uchan = trace_ust_find_channel_by_name(
1659 usess->domain_global.channels, channel_name);
1660 assert(uchan);
1661 }
1662
dac8e046
JG		 1663 if (!internal_event) {
1664 /*
1665 * Ensure the event name is not reserved for internal
1666 * use.
1667 */
1668 ret = validate_ust_event_name(event->name);
1669 if (ret) {
1670 WARN("Userspace event name %s failed validation.",
1671 event->name ?
1672 event->name : "NULL");
1673 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1674 goto error;
1675 }
1676 }
1677
2f77fc4b 1678 /* At this point, the session and channel exist on the tracer */
6b453b5e 1679 ret = event_ust_enable_tracepoint(usess, uchan, event,
88f06f15
JG		 1680 filter_expression, filter, exclusion,
1681 internal_event);
49d21f93
MD		 1682 /* We have passed ownership */
1683 filter_expression = NULL;
1684 filter = NULL;
1685 exclusion = NULL;
f73fabfd 1686 if (ret != LTTNG_OK) {
2f77fc4b
DG		 1687 goto error;
1688 }
1689 break;
1690 }
5cdb6027 1691 case LTTNG_DOMAIN_LOG4J:
f20baf8e 1692 case LTTNG_DOMAIN_JUL:
0e115563 1693 case LTTNG_DOMAIN_PYTHON:
f20baf8e 1694 {
da6c3a50 1695 const char *default_event_name, *default_chan_name;
fefd409b 1696 struct agent *agt;
f20baf8e
DG		 1697 struct lttng_event uevent;
1698 struct lttng_domain tmp_dom;
1699 struct ltt_ust_session *usess = session->ust_session;
1700
1701 assert(usess);
1702
5cdb6027 1703 agt = trace_ust_find_agent(usess, domain->type);
fefd409b 1704 if (!agt) {
5cdb6027 1705 agt = agent_create(domain->type);
fefd409b
DG		 1706 if (!agt) {
1707 ret = -LTTNG_ERR_NOMEM;
1708 goto error;
1709 }
1710 agent_add(agt, usess->agents);
1711 }
1712
022d91ba 1713 /* Create the default tracepoint. */
996de3c7 1714 memset(&uevent, 0, sizeof(uevent));
f20baf8e
DG		 1715 uevent.type = LTTNG_EVENT_TRACEPOINT;
1716 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
da6c3a50
DG		 1717 default_event_name = event_get_default_agent_ust_name(domain->type);
1718 if (!default_event_name) {
1719 ret = -LTTNG_ERR_FATAL;
1720 goto error;
f43f95a9 1721 }
da6c3a50 1722 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
f20baf8e
DG		 1723 uevent.name[sizeof(uevent.name) - 1] = '\0';
1724
1725 /*
1726 * The domain type is changed because we are about to enable the
1727 * default channel and event for the JUL domain that are hardcoded.
1728 * This happens in the UST domain.
1729 */
1730 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1731 tmp_dom.type = LTTNG_DOMAIN_UST;
1732
0e115563
DG		 1733 switch (domain->type) {
1734 case LTTNG_DOMAIN_LOG4J:
da6c3a50 1735 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
0e115563
DG		 1736 break;
1737 case LTTNG_DOMAIN_JUL:
da6c3a50 1738 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
0e115563
DG		 1739 break;
1740 case LTTNG_DOMAIN_PYTHON:
1741 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
1742 break;
1743 default:
1744 /* The switch/case we are in should avoid this else big problem */
1745 assert(0);
da6c3a50
DG		 1746 }
1747
971da06a
JG		 1748 {
1749 struct lttng_filter_bytecode *filter_copy = NULL;
1750
1751 if (filter) {
1752 filter_copy = zmalloc(
1753 sizeof(struct lttng_filter_bytecode)
1754 + filter->len);
1755 if (!filter_copy) {
1756 goto error;
1757 }
1758
1759 memcpy(filter_copy, filter,
1760 sizeof(struct lttng_filter_bytecode)
1761 + filter->len);
1762 }
1763
88f06f15 1764 ret = cmd_enable_event_internal(session, &tmp_dom,
971da06a
JG		 1765 (char *) default_chan_name,
1766 &uevent, filter_expression, filter_copy,
1767 NULL, wpipe);
1768 /* We have passed ownership */
1769 filter_expression = NULL;
1770 }
1771
f20baf8e
DG		 1772 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1773 goto error;
1774 }
1775
1776 /* The wild card * means that everything should be enabled. */
1777 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
fefd409b 1778 ret = event_agent_enable_all(usess, agt, event, filter);
971da06a 1779 filter = NULL;
f20baf8e 1780 } else {
fefd409b 1781 ret = event_agent_enable(usess, agt, event, filter);
971da06a 1782 filter = NULL;
f20baf8e
DG		 1783 }
1784 if (ret != LTTNG_OK) {
1785 goto error;
1786 }
1787
1788 break;
1789 }
2f77fc4b 1790 default:
f73fabfd 1791 ret = LTTNG_ERR_UND;
2f77fc4b
DG		 1792 goto error;
1793 }
1794
f73fabfd 1795 ret = LTTNG_OK;
2f77fc4b
DG		 1796
1797error:
49d21f93
MD		 1798 free(filter_expression);
1799 free(filter);
1800 free(exclusion);
2223c96f 1801 rcu_read_unlock();
2f77fc4b
DG		 1802 return ret;
1803}
1804
88f06f15
JG		 1805/*
1806 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1807 * We own filter, exclusion, and filter_expression.
1808 */
1809int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1810 char *channel_name, struct lttng_event *event,
1811 char *filter_expression,
1812 struct lttng_filter_bytecode *filter,
1813 struct lttng_event_exclusion *exclusion,
1814 int wpipe)
1815{
1816 return _cmd_enable_event(session, domain, channel_name, event,
1817 filter_expression, filter, exclusion, wpipe, false);
1818}
1819
1820/*
1821 * Enable an event which is internal to LTTng. An internal should
1822 * never be made visible to clients and are immune to checks such as
1823 * reserved names.
1824 */
1825static int cmd_enable_event_internal(struct ltt_session *session,
1826 struct lttng_domain *domain,
1827 char *channel_name, struct lttng_event *event,
1828 char *filter_expression,
1829 struct lttng_filter_bytecode *filter,
1830 struct lttng_event_exclusion *exclusion,
1831 int wpipe)
1832{
1833 return _cmd_enable_event(session, domain, channel_name, event,
1834 filter_expression, filter, exclusion, wpipe, true);
1835}
1836
2f77fc4b
DG		 1837/*
1838 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1839 */
1840ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1841{
1842 int ret;
1843 ssize_t nb_events = 0;
1844
1845 switch (domain) {
1846 case LTTNG_DOMAIN_KERNEL:
1847 nb_events = kernel_list_events(kernel_tracer_fd, events);
1848 if (nb_events < 0) {
f73fabfd 1849 ret = LTTNG_ERR_KERN_LIST_FAIL;
2f77fc4b
DG		 1850 goto error;
1851 }
1852 break;
1853 case LTTNG_DOMAIN_UST:
1854 nb_events = ust_app_list_events(events);
1855 if (nb_events < 0) {
f73fabfd 1856 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG		 1857 goto error;
1858 }
1859 break;
5cdb6027 1860 case LTTNG_DOMAIN_LOG4J:
3c6a091f 1861 case LTTNG_DOMAIN_JUL:
0e115563 1862 case LTTNG_DOMAIN_PYTHON:
f60140a1 1863 nb_events = agent_list_events(events, domain);
3c6a091f
DG		 1864 if (nb_events < 0) {
1865 ret = LTTNG_ERR_UST_LIST_FAIL;
1866 goto error;
1867 }
1868 break;
2f77fc4b 1869 default:
f73fabfd 1870 ret = LTTNG_ERR_UND;
2f77fc4b
DG		 1871 goto error;
1872 }
1873
1874 return nb_events;
1875
1876error:
1877 /* Return negative value to differentiate return code */
1878 return -ret;
1879}
1880
1881/*
1882 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1883 */
1884ssize_t cmd_list_tracepoint_fields(int domain,
1885 struct lttng_event_field **fields)
1886{
1887 int ret;
1888 ssize_t nb_fields = 0;
1889
1890 switch (domain) {
1891 case LTTNG_DOMAIN_UST:
1892 nb_fields = ust_app_list_event_fields(fields);
1893 if (nb_fields < 0) {
f73fabfd 1894 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG		 1895 goto error;
1896 }
1897 break;
1898 case LTTNG_DOMAIN_KERNEL:
1899 default: /* fall-through */
f73fabfd 1900 ret = LTTNG_ERR_UND;
2f77fc4b
DG		 1901 goto error;
1902 }
1903
1904 return nb_fields;
1905
1906error:
1907 /* Return negative value to differentiate return code */
1908 return -ret;
1909}
1910
834978fd
DG		 1911ssize_t cmd_list_syscalls(struct lttng_event **events)
1912{
1913 return syscall_table_list(events);
1914}
1915
a5dfbb9d
MD		 1916/*
1917 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
1918 *
1919 * Called with session lock held.
1920 */
1921ssize_t cmd_list_tracker_pids(struct ltt_session *session,
1922 int domain, int32_t **pids)
1923{
1924 int ret;
1925 ssize_t nr_pids = 0;
1926
1927 switch (domain) {
1928 case LTTNG_DOMAIN_KERNEL:
1929 {
1930 struct ltt_kernel_session *ksess;
1931
1932 ksess = session->kernel_session;
1933 nr_pids = kernel_list_tracker_pids(ksess, pids);
1934 if (nr_pids < 0) {
1935 ret = LTTNG_ERR_KERN_LIST_FAIL;
1936 goto error;
1937 }
1938 break;
1939 }
1940 case LTTNG_DOMAIN_UST:
1941 {
1942 struct ltt_ust_session *usess;
1943
1944 usess = session->ust_session;
1945 nr_pids = trace_ust_list_tracker_pids(usess, pids);
1946 if (nr_pids < 0) {
1947 ret = LTTNG_ERR_UST_LIST_FAIL;
1948 goto error;
1949 }
1950 break;
1951 }
1952 case LTTNG_DOMAIN_LOG4J:
1953 case LTTNG_DOMAIN_JUL:
1954 case LTTNG_DOMAIN_PYTHON:
1955 default:
1956 ret = LTTNG_ERR_UND;
1957 goto error;
1958 }
1959
1960 return nr_pids;
1961
1962error:
1963 /* Return negative value to differentiate return code */
1964 return -ret;
1965}
1966
2f77fc4b
DG		 1967/*
1968 * Command LTTNG_START_TRACE processed by the client thread.
a9ad0c8f
MD		 1969 *
1970 * Called with session mutex held.
2f77fc4b
DG		 1971 */
1972int cmd_start_trace(struct ltt_session *session)
1973{
1974 int ret;
cde3e505 1975 unsigned long nb_chan = 0;
2f77fc4b
DG		 1976 struct ltt_kernel_session *ksession;
1977 struct ltt_ust_session *usess;
2f77fc4b
DG		 1978
1979 assert(session);
1980
1981 /* Ease our life a bit ;) */
1982 ksession = session->kernel_session;
1983 usess = session->ust_session;
1984
8382cf6f
DG		 1985 /* Is the session already started? */
1986 if (session->active) {
f73fabfd 1987 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG		 1988 goto error;
1989 }
1990
cde3e505
DG		 1991 /*
1992 * Starting a session without channel is useless since after that it's not
1993 * possible to enable channel thus inform the client.
1994 */
1995 if (usess && usess->domain_global.channels) {
1996 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
1997 }
1998 if (ksession) {
1999 nb_chan += ksession->channel_count;
2000 }
2001 if (!nb_chan) {
2002 ret = LTTNG_ERR_NO_CHANNEL;
2003 goto error;
2004 }
2005
2f77fc4b
DG		 2006 /* Kernel tracing */
2007 if (ksession != NULL) {
9b6c7ec5
DG		 2008 ret = start_kernel_session(ksession, kernel_tracer_fd);
2009 if (ret != LTTNG_OK) {
2f77fc4b
DG		 2010 goto error;
2011 }
2f77fc4b
DG		 2012 }
2013
2014 /* Flag session that trace should start automatically */
2015 if (usess) {
14fb1ebe
DG		 2016 /*
2017 * Even though the start trace might fail, flag this session active so
2018 * other application coming in are started by default.
2019 */
2020 usess->active = 1;
2f77fc4b
DG		 2021
2022 ret = ust_app_start_trace_all(usess);
2023 if (ret < 0) {
f73fabfd 2024 ret = LTTNG_ERR_UST_START_FAIL;
2f77fc4b
DG		 2025 goto error;
2026 }
2027 }
2028
8382cf6f
DG		 2029 /* Flag this after a successful start. */
2030 session->has_been_started = 1;
2031 session->active = 1;
9b6c7ec5 2032
f73fabfd 2033 ret = LTTNG_OK;
2f77fc4b
DG		 2034
2035error:
2036 return ret;
2037}
2038
2039/*
2040 * Command LTTNG_STOP_TRACE processed by the client thread.
2041 */
2042int cmd_stop_trace(struct ltt_session *session)
2043{
2044 int ret;
2045 struct ltt_kernel_channel *kchan;
2046 struct ltt_kernel_session *ksession;
2047 struct ltt_ust_session *usess;
2048
2049 assert(session);
2050
2051 /* Short cut */
2052 ksession = session->kernel_session;
2053 usess = session->ust_session;
2054
8382cf6f
DG		 2055 /* Session is not active. Skip everythong and inform the client. */
2056 if (!session->active) {
f73fabfd 2057 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2f77fc4b
DG		 2058 goto error;
2059 }
2060
2f77fc4b 2061 /* Kernel tracer */
14fb1ebe 2062 if (ksession && ksession->active) {
2f77fc4b
DG		 2063 DBG("Stop kernel tracing");
2064
2065 /* Flush metadata if exist */
2066 if (ksession->metadata_stream_fd >= 0) {
2067 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2068 if (ret < 0) {
2069 ERR("Kernel metadata flush failed");
2070 }
2071 }
2072
2073 /* Flush all buffers before stopping */
2074 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2075 ret = kernel_flush_buffer(kchan);
2076 if (ret < 0) {
2077 ERR("Kernel flush buffer error");
2078 }
2079 }
2080
2081 ret = kernel_stop_session(ksession);
2082 if (ret < 0) {
f73fabfd 2083 ret = LTTNG_ERR_KERN_STOP_FAIL;
2f77fc4b
DG		 2084 goto error;
2085 }
2086
2087 kernel_wait_quiescent(kernel_tracer_fd);
9b6c7ec5 2088
14fb1ebe 2089 ksession->active = 0;
2f77fc4b
DG		 2090 }
2091
14fb1ebe
DG		 2092 if (usess && usess->active) {
2093 /*
2094 * Even though the stop trace might fail, flag this session inactive so
2095 * other application coming in are not started by default.
2096 */
2097 usess->active = 0;
2f77fc4b
DG		 2098
2099 ret = ust_app_stop_trace_all(usess);
2100 if (ret < 0) {
f73fabfd 2101 ret = LTTNG_ERR_UST_STOP_FAIL;
2f77fc4b
DG		 2102 goto error;
2103 }
2104 }
2105
8382cf6f
DG		 2106 /* Flag inactive after a successful stop. */
2107 session->active = 0;
f73fabfd 2108 ret = LTTNG_OK;
2f77fc4b
DG		 2109
2110error:
2111 return ret;
2112}
2113
2114/*
2115 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2116 */
bda32d56
JG		 2117int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2118 struct lttng_uri *uris)
2f77fc4b
DG		 2119{
2120 int ret, i;
2121 struct ltt_kernel_session *ksess = session->kernel_session;
2122 struct ltt_ust_session *usess = session->ust_session;
2f77fc4b
DG		 2123
2124 assert(session);
2125 assert(uris);
2126 assert(nb_uri > 0);
2127
8382cf6f
DG		 2128 /* Can't set consumer URI if the session is active. */
2129 if (session->active) {
f73fabfd 2130 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2f77fc4b
DG		 2131 goto error;
2132 }
2133
bda32d56 2134 /* Set the "global" consumer URIs */
2f77fc4b 2135 for (i = 0; i < nb_uri; i++) {
bda32d56
JG		 2136 ret = add_uri_to_consumer(session->consumer,
2137 &uris[i], 0, session->name);
a74934ba 2138 if (ret != LTTNG_OK) {
2f77fc4b
DG		 2139 goto error;
2140 }
2f77fc4b
DG		 2141 }
2142
bda32d56
JG		 2143 /* Set UST session URIs */
2144 if (session->ust_session) {
2145 for (i = 0; i < nb_uri; i++) {
2146 ret = add_uri_to_consumer(
2147 session->ust_session->consumer,
2148 &uris[i], LTTNG_DOMAIN_UST,
2149 session->name);
2150 if (ret != LTTNG_OK) {
2151 goto error;
2152 }
2153 }
2154 }
2155
2156 /* Set kernel session URIs */
2157 if (session->kernel_session) {
2158 for (i = 0; i < nb_uri; i++) {
2159 ret = add_uri_to_consumer(
2160 session->kernel_session->consumer,
2161 &uris[i], LTTNG_DOMAIN_KERNEL,
2162 session->name);
2163 if (ret != LTTNG_OK) {
2164 goto error;
2165 }
2166 }
2167 }
2168
7ab70fe0
DG		 2169 /*
2170 * Make sure to set the session in output mode after we set URI since a
2171 * session can be created without URL (thus flagged in no output mode).
2172 */
2173 session->output_traces = 1;
2174 if (ksess) {
2175 ksess->output_traces = 1;
bda32d56
JG		 2176 }
2177
2178 if (usess) {
7ab70fe0
DG		 2179 usess->output_traces = 1;
2180 }
2181
2f77fc4b 2182 /* All good! */
f73fabfd 2183 ret = LTTNG_OK;
2f77fc4b
DG		 2184
2185error:
2186 return ret;
2187}
2188
2189/*
2190 * Command LTTNG_CREATE_SESSION processed by the client thread.
2191 */
2192int cmd_create_session_uri(char *name, struct lttng_uri *uris,
ecc48a90 2193 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2f77fc4b
DG		 2194{
2195 int ret;
2f77fc4b
DG		 2196 struct ltt_session *session;
2197
2198 assert(name);
2bba9e53 2199 assert(creds);
785d2d0d 2200
2f77fc4b
DG		 2201 /*
2202 * Verify if the session already exist
2203 *
2204 * XXX: There is no need for the session lock list here since the caller
2205 * (process_client_msg) is holding it. We might want to change that so a
2206 * single command does not lock the entire session list.
2207 */
2208 session = session_find_by_name(name);
2209 if (session != NULL) {
f73fabfd 2210 ret = LTTNG_ERR_EXIST_SESS;
2f77fc4b
DG		 2211 goto find_error;
2212 }
2213
2214 /* Create tracing session in the registry */
dec56f6c 2215 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2f77fc4b 2216 LTTNG_SOCK_GET_GID_CRED(creds));
f73fabfd 2217 if (ret != LTTNG_OK) {
2f77fc4b
DG		 2218 goto session_error;
2219 }
2220
2221 /*
2222 * Get the newly created session pointer back
2223 *
2224 * XXX: There is no need for the session lock list here since the caller
2225 * (process_client_msg) is holding it. We might want to change that so a
2226 * single command does not lock the entire session list.
2227 */
2228 session = session_find_by_name(name);
2229 assert(session);
2230
ecc48a90 2231 session->live_timer = live_timer;
2f77fc4b
DG		 2232 /* Create default consumer output for the session not yet created. */
2233 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2234 if (session->consumer == NULL) {
f73fabfd 2235 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 2236 goto consumer_error;
2237 }
2238
2bba9e53 2239 if (uris) {
bda32d56 2240 ret = cmd_set_consumer_uri(session, nb_uri, uris);
2bba9e53
DG		 2241 if (ret != LTTNG_OK) {
2242 goto consumer_error;
2243 }
2244 session->output_traces = 1;
2245 } else {
2246 session->output_traces = 0;
2247 DBG2("Session %s created with no output", session->name);
2f77fc4b
DG		 2248 }
2249
2250 session->consumer->enabled = 1;
2251
f73fabfd 2252 return LTTNG_OK;
2f77fc4b
DG		 2253
2254consumer_error:
2255 session_destroy(session);
2256session_error:
2257find_error:
2258 return ret;
2259}
2260
27babd3a
DG		 2261/*
2262 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2263 */
2264int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2265 size_t nb_uri, lttng_sock_cred *creds)
2266{
2267 int ret;
2268 struct ltt_session *session;
2269 struct snapshot_output *new_output = NULL;
2270
2271 assert(name);
2272 assert(creds);
2273
2274 /*
2275 * Create session in no output mode with URIs set to NULL. The uris we've
2276 * received are for a default snapshot output if one.
2277 */
ecc48a90 2278 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
27babd3a
DG		 2279 if (ret != LTTNG_OK) {
2280 goto error;
2281 }
2282
2283 /* Get the newly created session pointer back. This should NEVER fail. */
2284 session = session_find_by_name(name);
2285 assert(session);
2286
2287 /* Flag session for snapshot mode. */
2288 session->snapshot_mode = 1;
2289
2290 /* Skip snapshot output creation if no URI is given. */
2291 if (nb_uri == 0) {
2292 goto end;
2293 }
2294
2295 new_output = snapshot_output_alloc();
2296 if (!new_output) {
2297 ret = LTTNG_ERR_NOMEM;
2298 goto error_snapshot_alloc;
2299 }
2300
2301 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2302 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2303 if (ret < 0) {
2304 if (ret == -ENOMEM) {
2305 ret = LTTNG_ERR_NOMEM;
2306 } else {
2307 ret = LTTNG_ERR_INVALID;
2308 }
2309 goto error_snapshot;
2310 }
2311
2312 rcu_read_lock();
2313 snapshot_add_output(&session->snapshot, new_output);
2314 rcu_read_unlock();
2315
2316end:
2317 return LTTNG_OK;
2318
2319error_snapshot:
2320 snapshot_output_destroy(new_output);
2321error_snapshot_alloc:
2322 session_destroy(session);
2323error:
2324 return ret;
2325}
2326
2f77fc4b
DG		 2327/*
2328 * Command LTTNG_DESTROY_SESSION processed by the client thread.
a9ad0c8f
MD		 2329 *
2330 * Called with session lock held.
2f77fc4b
DG		 2331 */
2332int cmd_destroy_session(struct ltt_session *session, int wpipe)
2333{
2334 int ret;
2335 struct ltt_ust_session *usess;
2336 struct ltt_kernel_session *ksess;
2337
2338 /* Safety net */
2339 assert(session);
2340
2341 usess = session->ust_session;
2342 ksess = session->kernel_session;
2343
2344 /* Clean kernel session teardown */
2345 kernel_destroy_session(ksess);
2346
2347 /* UST session teardown */
2348 if (usess) {
2349 /* Close any relayd session */
2350 consumer_output_send_destroy_relayd(usess->consumer);
2351
2352 /* Destroy every UST application related to this session. */
2353 ret = ust_app_destroy_trace_all(usess);
2354 if (ret) {
2355 ERR("Error in ust_app_destroy_trace_all");
2356 }
2357
2358 /* Clean up the rest. */
2359 trace_ust_destroy_session(usess);
2360 }
2361
2362 /*
2363 * Must notify the kernel thread here to update it's poll set in order to
2364 * remove the channel(s)' fd just destroyed.
2365 */
2366 ret = notify_thread_pipe(wpipe);
2367 if (ret < 0) {
2368 PERROR("write kernel poll pipe");
2369 }
2370
2371 ret = session_destroy(session);
2372
2373 return ret;
2374}
2375
2376/*
2377 * Command LTTNG_CALIBRATE processed by the client thread.
2378 */
2379int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2380{
2381 int ret;
2382
2383 switch (domain) {
2384 case LTTNG_DOMAIN_KERNEL:
2385 {
2386 struct lttng_kernel_calibrate kcalibrate;
2387
2e84128e
DG		 2388 switch (calibrate->type) {
2389 case LTTNG_CALIBRATE_FUNCTION:
2390 default:
2391 /* Default and only possible calibrate option. */
2392 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2393 break;
2394 }
2395
2f77fc4b
DG		 2396 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2397 if (ret < 0) {
f73fabfd 2398 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2f77fc4b
DG		 2399 goto error;
2400 }
2401 break;
2402 }
2403 case LTTNG_DOMAIN_UST:
2404 {
2405 struct lttng_ust_calibrate ucalibrate;
2406
2e84128e
DG		 2407 switch (calibrate->type) {
2408 case LTTNG_CALIBRATE_FUNCTION:
2409 default:
2410 /* Default and only possible calibrate option. */
2411 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2412 break;
2413 }
2414
2f77fc4b
DG		 2415 ret = ust_app_calibrate_glb(&ucalibrate);
2416 if (ret < 0) {
f73fabfd 2417 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2f77fc4b
DG		 2418 goto error;
2419 }
2420 break;
2421 }
2422 default:
f73fabfd 2423 ret = LTTNG_ERR_UND;
2f77fc4b
DG		 2424 goto error;
2425 }
2426
f73fabfd 2427 ret = LTTNG_OK;
2f77fc4b
DG		 2428
2429error:
2430 return ret;
2431}
2432
2433/*
2434 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2435 */
2436int cmd_register_consumer(struct ltt_session *session, int domain,
2437 const char *sock_path, struct consumer_data *cdata)
2438{
2439 int ret, sock;
dd81b457 2440 struct consumer_socket *socket = NULL;
2f77fc4b
DG		 2441
2442 assert(session);
2443 assert(cdata);
2444 assert(sock_path);
2445
2446 switch (domain) {
2447 case LTTNG_DOMAIN_KERNEL:
2448 {
2449 struct ltt_kernel_session *ksess = session->kernel_session;
2450
2451 assert(ksess);
2452
2453 /* Can't register a consumer if there is already one */
2454 if (ksess->consumer_fds_sent != 0) {
f73fabfd 2455 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG		 2456 goto error;
2457 }
2458
2459 sock = lttcomm_connect_unix_sock(sock_path);
2460 if (sock < 0) {
f73fabfd 2461 ret = LTTNG_ERR_CONNECT_FAIL;
2f77fc4b
DG		 2462 goto error;
2463 }
4ce514c4 2464 cdata->cmd_sock = sock;
2f77fc4b 2465
4ce514c4 2466 socket = consumer_allocate_socket(&cdata->cmd_sock);
2f77fc4b 2467 if (socket == NULL) {
f66c074c
DG		 2468 ret = close(sock);
2469 if (ret < 0) {
2470 PERROR("close register consumer");
2471 }
4ce514c4 2472 cdata->cmd_sock = -1;
f73fabfd 2473 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 2474 goto error;
2475 }
2476
2477 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2478 if (socket->lock == NULL) {
2479 PERROR("zmalloc pthread mutex");
f73fabfd 2480 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 2481 goto error;
2482 }
2483 pthread_mutex_init(socket->lock, NULL);
2484 socket->registered = 1;
2485
2486 rcu_read_lock();
2487 consumer_add_socket(socket, ksess->consumer);
2488 rcu_read_unlock();
2489
2490 pthread_mutex_lock(&cdata->pid_mutex);
2491 cdata->pid = -1;
2492 pthread_mutex_unlock(&cdata->pid_mutex);
2493
2494 break;
2495 }
2496 default:
2497 /* TODO: Userspace tracing */
f73fabfd 2498 ret = LTTNG_ERR_UND;
2f77fc4b
DG		 2499 goto error;
2500 }
2501
dd81b457 2502 return LTTNG_OK;
2f77fc4b
DG		 2503
2504error:
dd81b457
DG		 2505 if (socket) {
2506 consumer_destroy_socket(socket);
2507 }
2f77fc4b
DG		 2508 return ret;
2509}
2510
2511/*
2512 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2513 */
2514ssize_t cmd_list_domains(struct ltt_session *session,
2515 struct lttng_domain **domains)
2516{
2517 int ret, index = 0;
2518 ssize_t nb_dom = 0;
fefd409b
DG		 2519 struct agent *agt;
2520 struct lttng_ht_iter iter;
2f77fc4b
DG		 2521
2522 if (session->kernel_session != NULL) {
2523 DBG3("Listing domains found kernel domain");
2524 nb_dom++;
2525 }
2526
2527 if (session->ust_session != NULL) {
2528 DBG3("Listing domains found UST global domain");
2529 nb_dom++;
3c6a091f 2530
e0a74f01 2531 rcu_read_lock();
fefd409b
DG		 2532 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2533 agt, node.node) {
2534 if (agt->being_used) {
2535 nb_dom++;
2536 }
3c6a091f 2537 }
e0a74f01 2538 rcu_read_unlock();
2f77fc4b
DG		 2539 }
2540
fa64dfb4
JG		 2541 if (!nb_dom) {
2542 goto end;
2543 }
2544
2f77fc4b
DG		 2545 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2546 if (*domains == NULL) {
f73fabfd 2547 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 2548 goto error;
2549 }
2550
2551 if (session->kernel_session != NULL) {
2552 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
b5edb9e8
PP		 2553
2554 /* Kernel session buffer type is always GLOBAL */
2555 (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL;
2556
2f77fc4b
DG		 2557 index++;
2558 }
2559
2560 if (session->ust_session != NULL) {
2561 (*domains)[index].type = LTTNG_DOMAIN_UST;
88c5f0d8 2562 (*domains)[index].buf_type = session->ust_session->buffer_type;
2f77fc4b 2563 index++;
3c6a091f 2564
e0a74f01 2565 rcu_read_lock();
fefd409b
DG		 2566 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2567 agt, node.node) {
2568 if (agt->being_used) {
2569 (*domains)[index].type = agt->domain;
2570 (*domains)[index].buf_type = session->ust_session->buffer_type;
2571 index++;
2572 }
3c6a091f 2573 }
e0a74f01 2574 rcu_read_unlock();
2f77fc4b 2575 }
fa64dfb4 2576end:
2f77fc4b
DG		 2577 return nb_dom;
2578
2579error:
f73fabfd
DG		 2580 /* Return negative value to differentiate return code */
2581 return -ret;
2f77fc4b
DG		 2582}
2583
2584
2585/*
2586 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2587 */
2588ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2589 struct lttng_channel **channels)
2590{
2591 int ret;
2592 ssize_t nb_chan = 0;
2593
2594 switch (domain) {
2595 case LTTNG_DOMAIN_KERNEL:
2596 if (session->kernel_session != NULL) {
2597 nb_chan = session->kernel_session->channel_count;
2598 }
2599 DBG3("Number of kernel channels %zd", nb_chan);
c7d620a2
DG		 2600 if (nb_chan <= 0) {
2601 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2602 }
2f77fc4b
DG		 2603 break;
2604 case LTTNG_DOMAIN_UST:
2605 if (session->ust_session != NULL) {
7ffc31a2 2606 rcu_read_lock();
2f77fc4b 2607 nb_chan = lttng_ht_get_count(
7ffc31a2
JG		 2608 session->ust_session->domain_global.channels);
2609 rcu_read_unlock();
2f77fc4b
DG		 2610 }
2611 DBG3("Number of UST global channels %zd", nb_chan);
ade7ce52 2612 if (nb_chan < 0) {
c7d620a2 2613 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
ade7ce52 2614 goto error;
c7d620a2 2615 }
2f77fc4b
DG		 2616 break;
2617 default:
f73fabfd 2618 ret = LTTNG_ERR_UND;
2f77fc4b
DG		 2619 goto error;
2620 }
2621
2622 if (nb_chan > 0) {
2623 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2624 if (*channels == NULL) {
f73fabfd 2625 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG		 2626 goto error;
2627 }
2628
2629 list_lttng_channels(domain, session, *channels);
2f77fc4b
DG		 2630 }
2631
2632 return nb_chan;
2633
2634error:
f73fabfd
DG		 2635 /* Return negative value to differentiate return code */
2636 return -ret;
2f77fc4b
DG		 2637}
2638
2639/*
2640 * Command LTTNG_LIST_EVENTS processed by the client thread.
2641 */
2642ssize_t cmd_list_events(int domain, struct ltt_session *session,
2643 char *channel_name, struct lttng_event **events)
2644{
2645 int ret = 0;
2646 ssize_t nb_event = 0;
2647
2648 switch (domain) {
2649 case LTTNG_DOMAIN_KERNEL:
2650 if (session->kernel_session != NULL) {
2651 nb_event = list_lttng_kernel_events(channel_name,
2652 session->kernel_session, events);
2653 }
2654 break;
2655 case LTTNG_DOMAIN_UST:
2656 {
2657 if (session->ust_session != NULL) {
2658 nb_event = list_lttng_ust_global_events(channel_name,
2659 &session->ust_session->domain_global, events);
2660 }
2661 break;
2662 }
5cdb6027 2663 case LTTNG_DOMAIN_LOG4J:
3c6a091f 2664 case LTTNG_DOMAIN_JUL:
0e115563 2665 case LTTNG_DOMAIN_PYTHON:
3c6a091f 2666 if (session->ust_session) {
fefd409b
DG		 2667 struct lttng_ht_iter iter;
2668 struct agent *agt;
2669
b11feea5 2670 rcu_read_lock();
fefd409b
DG		 2671 cds_lfht_for_each_entry(session->ust_session->agents->ht,
2672 &iter.iter, agt, node.node) {
2673 nb_event = list_lttng_agent_events(agt, events);
2674 }
b11feea5 2675 rcu_read_unlock();
3c6a091f
DG		 2676 }
2677 break;
2f77fc4b 2678 default:
f73fabfd 2679 ret = LTTNG_ERR_UND;
2f77fc4b
DG		 2680 goto error;
2681 }
2682
f73fabfd 2683 return nb_event;
2f77fc4b
DG		 2684
2685error:
f73fabfd
DG		 2686 /* Return negative value to differentiate return code */
2687 return -ret;
2f77fc4b
DG		 2688}
2689
2690/*
2691 * Using the session list, filled a lttng_session array to send back to the
2692 * client for session listing.
2693 *
2694 * The session list lock MUST be acquired before calling this function. Use
2695 * session_lock_list() and session_unlock_list().
2696 */
2697void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2698 gid_t gid)
2699{
2700 int ret;
2701 unsigned int i = 0;
2702 struct ltt_session *session;
2703 struct ltt_session_list *list = session_get_list();
2704
2705 DBG("Getting all available session for UID %d GID %d",
2706 uid, gid);
2707 /*
2708 * Iterate over session list and append data after the control struct in
2709 * the buffer.
2710 */
2711 cds_list_for_each_entry(session, &list->head, list) {
2712 /*
2713 * Only list the sessions the user can control.
2714 */
2715 if (!session_access_ok(session, uid, gid)) {
2716 continue;
2717 }
2718
2719 struct ltt_kernel_session *ksess = session->kernel_session;
2720 struct ltt_ust_session *usess = session->ust_session;
2721
2722 if (session->consumer->type == CONSUMER_DST_NET ||
2723 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2724 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2725 ret = build_network_session_path(sessions[i].path,
dec56f6c 2726 sizeof(sessions[i].path), session);
2f77fc4b 2727 } else {
dec56f6c 2728 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2f77fc4b
DG		 2729 session->consumer->dst.trace_path);
2730 }
2731 if (ret < 0) {
2732 PERROR("snprintf session path");
2733 continue;
2734 }
2735
2736 strncpy(sessions[i].name, session->name, NAME_MAX);
2737 sessions[i].name[NAME_MAX - 1] = '\0';
8382cf6f 2738 sessions[i].enabled = session->active;
2cbf8fed 2739 sessions[i].snapshot_mode = session->snapshot_mode;
8960e9cd 2740 sessions[i].live_timer_interval = session->live_timer;
2f77fc4b
DG		 2741 i++;
2742 }
2743}
2744
806e2684 2745/*
6d805429 2746 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
d3f14b8a 2747 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
806e2684 2748 */
6d805429 2749int cmd_data_pending(struct ltt_session *session)
806e2684
DG		 2750{
2751 int ret;
2752 struct ltt_kernel_session *ksess = session->kernel_session;
2753 struct ltt_ust_session *usess = session->ust_session;
2754
2755 assert(session);
2756
2757 /* Session MUST be stopped to ask for data availability. */
8382cf6f 2758 if (session->active) {
806e2684
DG		 2759 ret = LTTNG_ERR_SESSION_STARTED;
2760 goto error;
3a89d11a
DG		 2761 } else {
2762 /*
2763 * If stopped, just make sure we've started before else the above call
2764 * will always send that there is data pending.
2765 *
2766 * The consumer assumes that when the data pending command is received,
2767 * the trace has been started before or else no output data is written
2768 * by the streams which is a condition for data pending. So, this is
2769 * *VERY* important that we don't ask the consumer before a start
2770 * trace.
2771 */
8382cf6f 2772 if (!session->has_been_started) {
3a89d11a
DG		 2773 ret = 0;
2774 goto error;
2775 }
806e2684
DG		 2776 }
2777
2778 if (ksess && ksess->consumer) {
6d805429
DG		 2779 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2780 if (ret == 1) {
806e2684
DG		 2781 /* Data is still being extracted for the kernel. */
2782 goto error;
2783 }
2784 }
2785
2786 if (usess && usess->consumer) {
6d805429
DG		 2787 ret = consumer_is_data_pending(usess->id, usess->consumer);
2788 if (ret == 1) {
806e2684
DG		 2789 /* Data is still being extracted for the kernel. */
2790 goto error;
2791 }
2792 }
2793
2794 /* Data is ready to be read by a viewer */
6d805429 2795 ret = 0;
806e2684
DG		 2796
2797error:
2798 return ret;
2799}
2800
6dc3064a
DG		 2801/*
2802 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2803 *
2804 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2805 */
2806int cmd_snapshot_add_output(struct ltt_session *session,
2807 struct lttng_snapshot_output *output, uint32_t *id)
2808{
2809 int ret;
2810 struct snapshot_output *new_output;
2811
2812 assert(session);
2813 assert(output);
2814
2815 DBG("Cmd snapshot add output for session %s", session->name);
2816
2817 /*
d3f14b8a
MD		 2818 * Permission denied to create an output if the session is not
2819 * set in no output mode.
6dc3064a
DG		 2820 */
2821 if (session->output_traces) {
2822 ret = LTTNG_ERR_EPERM;
2823 goto error;
2824 }
2825
2826 /* Only one output is allowed until we have the "tee" feature. */
2827 if (session->snapshot.nb_output == 1) {
2828 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2829 goto error;
2830 }
2831
2832 new_output = snapshot_output_alloc();
2833 if (!new_output) {
2834 ret = LTTNG_ERR_NOMEM;
2835 goto error;
2836 }
2837
2838 ret = snapshot_output_init(output->max_size, output->name,
2839 output->ctrl_url, output->data_url, session->consumer, new_output,
2840 &session->snapshot);
2841 if (ret < 0) {
2842 if (ret == -ENOMEM) {
2843 ret = LTTNG_ERR_NOMEM;
2844 } else {
2845 ret = LTTNG_ERR_INVALID;
2846 }
2847 goto free_error;
2848 }
2849
6dc3064a
DG		 2850 rcu_read_lock();
2851 snapshot_add_output(&session->snapshot, new_output);
2852 if (id) {
2853 *id = new_output->id;
2854 }
2855 rcu_read_unlock();
2856
2857 return LTTNG_OK;
2858
2859free_error:
2860 snapshot_output_destroy(new_output);
2861error:
2862 return ret;
2863}
2864
2865/*
2866 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2867 *
2868 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2869 */
2870int cmd_snapshot_del_output(struct ltt_session *session,
2871 struct lttng_snapshot_output *output)
2872{
2873 int ret;
eb240553 2874 struct snapshot_output *sout = NULL;
6dc3064a
DG		 2875
2876 assert(session);
2877 assert(output);
2878
6dc3064a
DG		 2879 rcu_read_lock();
2880
2881 /*
d3f14b8a
MD		 2882 * Permission denied to create an output if the session is not
2883 * set in no output mode.
6dc3064a
DG		 2884 */
2885 if (session->output_traces) {
2886 ret = LTTNG_ERR_EPERM;
2887 goto error;
2888 }
2889
eb240553
DG		 2890 if (output->id) {
2891 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2892 session->name);
2893 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2894 } else if (*output->name != '\0') {
2895 DBG("Cmd snapshot del output name %s for session %s", output->name,
2896 session->name);
2897 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2898 }
6dc3064a
DG		 2899 if (!sout) {
2900 ret = LTTNG_ERR_INVALID;
2901 goto error;
2902 }
2903
2904 snapshot_delete_output(&session->snapshot, sout);
2905 snapshot_output_destroy(sout);
2906 ret = LTTNG_OK;
2907
2908error:
2909 rcu_read_unlock();
2910 return ret;
2911}
2912
2913/*
2914 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2915 *
2916 * If no output is available, outputs is untouched and 0 is returned.
2917 *
2918 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2919 */
2920ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2921 struct lttng_snapshot_output **outputs)
2922{
2923 int ret, idx = 0;
b223ca94 2924 struct lttng_snapshot_output *list = NULL;
6dc3064a
DG		 2925 struct lttng_ht_iter iter;
2926 struct snapshot_output *output;
2927
2928 assert(session);
2929 assert(outputs);
2930
2931 DBG("Cmd snapshot list outputs for session %s", session->name);
2932
2933 /*
d3f14b8a
MD		 2934 * Permission denied to create an output if the session is not
2935 * set in no output mode.
6dc3064a
DG		 2936 */
2937 if (session->output_traces) {
b223ca94 2938 ret = -LTTNG_ERR_EPERM;
6dc3064a
DG		 2939 goto error;
2940 }
2941
2942 if (session->snapshot.nb_output == 0) {
2943 ret = 0;
2944 goto error;
2945 }
2946
2947 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2948 if (!list) {
b223ca94 2949 ret = -LTTNG_ERR_NOMEM;
6dc3064a
DG		 2950 goto error;
2951 }
2952
2953 /* Copy list from session to the new list object. */
b223ca94 2954 rcu_read_lock();
6dc3064a
DG		 2955 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2956 output, node.node) {
2957 assert(output->consumer);
2958 list[idx].id = output->id;
2959 list[idx].max_size = output->max_size;
2960 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2961 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2962 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2963 sizeof(list[idx].ctrl_url));
2964 } else {
2965 /* Control URI. */
2966 ret = uri_to_str_url(&output->consumer->dst.net.control,
2967 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2968 if (ret < 0) {
b223ca94
JG		 2969 ret = -LTTNG_ERR_NOMEM;
2970 goto error;
6dc3064a
DG		 2971 }
2972
2973 /* Data URI. */
2974 ret = uri_to_str_url(&output->consumer->dst.net.data,
2975 list[idx].data_url, sizeof(list[idx].data_url));
2976 if (ret < 0) {
b223ca94
JG		 2977 ret = -LTTNG_ERR_NOMEM;
2978 goto error;
6dc3064a
DG		 2979 }
2980 }
2981 idx++;
2982 }
2983
2984 *outputs = list;
b223ca94
JG		 2985 list = NULL;
2986 ret = session->snapshot.nb_output;
6dc3064a 2987error:
b223ca94
JG		 2988 free(list);
2989 rcu_read_unlock();
2990 return ret;
6dc3064a
DG		 2991}
2992
2993/*
2994 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2995 * snapshot output is *not* set with a remote destination.
2996 *
a934f4af 2997 * Return 0 on success or a LTTNG_ERR code.
6dc3064a
DG		 2998 */
2999static int set_relayd_for_snapshot(struct consumer_output *consumer,
3000 struct snapshot_output *snap_output, struct ltt_session *session)
3001{
a934f4af 3002 int ret = LTTNG_OK;
6dc3064a
DG		 3003 struct lttng_ht_iter iter;
3004 struct consumer_socket *socket;
3005
3006 assert(consumer);
3007 assert(snap_output);
3008 assert(session);
3009
3010 DBG2("Set relayd object from snapshot output");
3011
3012 /* Ignore if snapshot consumer output is not network. */
3013 if (snap_output->consumer->type != CONSUMER_DST_NET) {
3014 goto error;
3015 }
3016
3017 /*
3018 * For each consumer socket, create and send the relayd object of the
3019 * snapshot output.
3020 */
3021 rcu_read_lock();
5eecee74
DG		 3022 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
3023 socket, node.node) {
6dc3064a 3024 ret = send_consumer_relayd_sockets(0, session->id,
d3e2ba59
JD		 3025 snap_output->consumer, socket,
3026 session->name, session->hostname,
3027 session->live_timer);
a934f4af 3028 if (ret != LTTNG_OK) {
6dc3064a
DG		 3029 rcu_read_unlock();
3030 goto error;
3031 }
3032 }
3033 rcu_read_unlock();
3034
3035error:
3036 return ret;
3037}
3038
3039/*
3040 * Record a kernel snapshot.
3041 *
fac41e72 3042 * Return LTTNG_OK on success or a LTTNG_ERR code.
6dc3064a
DG		 3043 */
3044static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
5c786ded 3045 struct snapshot_output *output, struct ltt_session *session,
d07ceecd 3046 int wait, uint64_t nb_packets_per_stream)
6dc3064a
DG		 3047{
3048 int ret;
3049
3050 assert(ksess);
3051 assert(output);
3052 assert(session);
3053
10a50311
JD		 3054 /* Get the datetime for the snapshot output directory. */
3055 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
3056 sizeof(output->datetime));
3057 if (!ret) {
a934f4af 3058 ret = LTTNG_ERR_INVALID;
10a50311
JD		 3059 goto error;
3060 }
3061
af706bb7
DG		 3062 /*
3063 * Copy kernel session sockets so we can communicate with the right
3064 * consumer for the snapshot record command.
3065 */
3066 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
3067 if (ret < 0) {
a934f4af 3068 ret = LTTNG_ERR_NOMEM;
af706bb7 3069 goto error;
6dc3064a
DG		 3070 }
3071
3072 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
a934f4af 3073 if (ret != LTTNG_OK) {
af706bb7 3074 goto error_snapshot;
6dc3064a
DG		 3075 }
3076
d07ceecd 3077 ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream);
2a06df8d 3078 if (ret != LTTNG_OK) {
af706bb7 3079 goto error_snapshot;
6dc3064a
DG		 3080 }
3081
a934f4af 3082 ret = LTTNG_OK;
1371fc12 3083 goto end;
a934f4af 3084
af706bb7
DG		 3085error_snapshot:
3086 /* Clean up copied sockets so this output can use some other later on. */
3087 consumer_destroy_output_sockets(output->consumer);
6dc3064a 3088error:
1371fc12 3089end:
6dc3064a
DG		 3090 return ret;
3091}
3092
3093/*
3094 * Record a UST snapshot.
3095 *
a934f4af 3096 * Return 0 on success or a LTTNG_ERR error code.
6dc3064a
DG		 3097 */
3098static int record_ust_snapshot(struct ltt_ust_session *usess,
5c786ded 3099 struct snapshot_output *output, struct ltt_session *session,
d07ceecd 3100 int wait, uint64_t nb_packets_per_stream)
6dc3064a
DG		 3101{
3102 int ret;
3103
3104 assert(usess);
3105 assert(output);
3106 assert(session);
3107
10a50311
JD		 3108 /* Get the datetime for the snapshot output directory. */
3109 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
3110 sizeof(output->datetime));
3111 if (!ret) {
a934f4af 3112 ret = LTTNG_ERR_INVALID;
10a50311
JD		 3113 goto error;
3114 }
3115
af706bb7 3116 /*
d3f14b8a 3117 * Copy UST session sockets so we can communicate with the right
af706bb7
DG		 3118 * consumer for the snapshot record command.
3119 */
3120 ret = consumer_copy_sockets(output->consumer, usess->consumer);
3121 if (ret < 0) {
a934f4af 3122 ret = LTTNG_ERR_NOMEM;
af706bb7 3123 goto error;
6dc3064a
DG		 3124 }
3125
3126 ret = set_relayd_for_snapshot(usess->consumer, output, session);
a934f4af 3127 if (ret != LTTNG_OK) {
af706bb7 3128 goto error_snapshot;
6dc3064a
DG		 3129 }
3130
d07ceecd 3131 ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream);
6dc3064a 3132 if (ret < 0) {
7badf927
DG		 3133 switch (-ret) {
3134 case EINVAL:
a934f4af 3135 ret = LTTNG_ERR_INVALID;
7badf927
DG		 3136 break;
3137 case ENODATA:
3138 ret = LTTNG_ERR_SNAPSHOT_NODATA;
3139 break;
3140 default:
3141 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3142 break;
5c786ded 3143 }
af706bb7 3144 goto error_snapshot;
6dc3064a
DG		 3145 }
3146
a934f4af
DG		 3147 ret = LTTNG_OK;
3148
af706bb7
DG		 3149error_snapshot:
3150 /* Clean up copied sockets so this output can use some other later on. */
3151 consumer_destroy_output_sockets(output->consumer);
6dc3064a
DG		 3152error:
3153 return ret;
3154}
3155
d07ceecd
MD		 3156static
3157uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session,
3158 uint64_t cur_nr_packets)
68808f4e 3159{
d07ceecd 3160 uint64_t tot_size = 0;
68808f4e
DG		 3161
3162 if (session->kernel_session) {
3163 struct ltt_kernel_channel *chan;
3164 struct ltt_kernel_session *ksess = session->kernel_session;
3165
68808f4e 3166 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
d07ceecd
MD		 3167 if (cur_nr_packets >= chan->channel->attr.num_subbuf) {
3168 /*
3169 * Don't take channel into account if we
3170 * already grab all its packets.
3171 */
3172 continue;
68808f4e 3173 }
d07ceecd
MD		 3174 tot_size += chan->channel->attr.subbuf_size
3175 * chan->stream_count;
68808f4e
DG		 3176 }
3177 }
3178
3179 if (session->ust_session) {
68808f4e
DG		 3180 struct ltt_ust_session *usess = session->ust_session;
3181
d07ceecd
MD		 3182 tot_size += ust_app_get_size_one_more_packet_per_stream(usess,
3183 cur_nr_packets);
68808f4e
DG		 3184 }
3185
d07ceecd 3186 return tot_size;
68808f4e
DG		 3187}
3188
5c786ded 3189/*
d07ceecd
MD		 3190 * Calculate the number of packets we can grab from each stream that
3191 * fits within the overall snapshot max size.
3192 *
3193 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
3194 * the number of packets per stream.
3195 *
3196 * TODO: this approach is not perfect: we consider the worse case
3197 * (packet filling the sub-buffers) as an upper bound, but we could do
3198 * better if we do this calculation while we actually grab the packet
3199 * content: we would know how much padding we don't actually store into
3200 * the file.
3201 *
3202 * This algorithm is currently bounded by the number of packets per
3203 * stream.
3204 *
3205 * Since we call this algorithm before actually grabbing the data, it's
3206 * an approximation: for instance, applications could appear/disappear
3207 * in between this call and actually grabbing data.
5c786ded 3208 */
d07ceecd
MD		 3209static
3210int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size)
5c786ded 3211{
d07ceecd
MD		 3212 int64_t size_left;
3213 uint64_t cur_nb_packets = 0;
5c786ded 3214
d07ceecd
MD		 3215 if (!max_size) {
3216 return 0; /* Infinite */
5c786ded
JD		 3217 }
3218
d07ceecd
MD		 3219 size_left = max_size;
3220 for (;;) {
3221 uint64_t one_more_packet_tot_size;
5c786ded 3222
d07ceecd
MD		 3223 one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session,
3224 cur_nb_packets);
3225 if (!one_more_packet_tot_size) {
3226 /* We are already grabbing all packets. */
3227 break;
3228 }
3229 size_left -= one_more_packet_tot_size;
3230 if (size_left < 0) {
3231 break;
3232 }
3233 cur_nb_packets++;
5c786ded 3234 }
d07ceecd
MD		 3235 if (!cur_nb_packets) {
3236 /* Not enough room to grab one packet of each stream, error. */
3237 return -1;
3238 }
3239 return cur_nb_packets;
5c786ded
JD		 3240}
3241
6dc3064a
DG		 3242/*
3243 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3244 *
3245 * The wait parameter is ignored so this call always wait for the snapshot to
3246 * complete before returning.
3247 *
3248 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3249 */
3250int cmd_snapshot_record(struct ltt_session *session,
3251 struct lttng_snapshot_output *output, int wait)
3252{
3253 int ret = LTTNG_OK;
e1986656
DG		 3254 unsigned int use_tmp_output = 0;
3255 struct snapshot_output tmp_output;
00e1dfc4 3256 unsigned int snapshot_success = 0;
6dc3064a
DG		 3257
3258 assert(session);
ba45d9f0 3259 assert(output);
6dc3064a
DG		 3260
3261 DBG("Cmd snapshot record for session %s", session->name);
3262
3263 /*
d3f14b8a
MD		 3264 * Permission denied to create an output if the session is not
3265 * set in no output mode.
6dc3064a
DG		 3266 */
3267 if (session->output_traces) {
3268 ret = LTTNG_ERR_EPERM;
3269 goto error;
3270 }
3271
3272 /* The session needs to be started at least once. */
8382cf6f 3273 if (!session->has_been_started) {
6dc3064a
DG		 3274 ret = LTTNG_ERR_START_SESSION_ONCE;
3275 goto error;
3276 }
3277
3278 /* Use temporary output for the session. */
ba45d9f0 3279 if (*output->ctrl_url != '\0') {
6dc3064a
DG		 3280 ret = snapshot_output_init(output->max_size, output->name,
3281 output->ctrl_url, output->data_url, session->consumer,
e1986656 3282 &tmp_output, NULL);
6dc3064a
DG		 3283 if (ret < 0) {
3284 if (ret == -ENOMEM) {
3285 ret = LTTNG_ERR_NOMEM;
3286 } else {
3287 ret = LTTNG_ERR_INVALID;
3288 }
3289 goto error;
3290 }
1bfe7328
DG		 3291 /* Use the global session count for the temporary snapshot. */
3292 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
e1986656 3293 use_tmp_output = 1;
6dc3064a
DG		 3294 }
3295
3296 if (session->kernel_session) {
3297 struct ltt_kernel_session *ksess = session->kernel_session;
3298
e1986656 3299 if (use_tmp_output) {
d07ceecd
MD		 3300 int64_t nb_packets_per_stream;
3301
3302 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3303 tmp_output.max_size);
3304 if (nb_packets_per_stream < 0) {
3305 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3306 goto error;
3307 }
e1986656 3308 ret = record_kernel_snapshot(ksess, &tmp_output, session,
d07ceecd 3309 wait, nb_packets_per_stream);
a934f4af 3310 if (ret != LTTNG_OK) {
6dc3064a
DG		 3311 goto error;
3312 }
1bfe7328 3313 snapshot_success = 1;
6dc3064a
DG		 3314 } else {
3315 struct snapshot_output *sout;
3316 struct lttng_ht_iter iter;
3317
3318 rcu_read_lock();
3319 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3320 &iter.iter, sout, node.node) {
d07ceecd
MD		 3321 int64_t nb_packets_per_stream;
3322
e1986656
DG		 3323 /*
3324 * Make a local copy of the output and assign the possible
3325 * temporary value given by the caller.
3326 */
3327 memset(&tmp_output, 0, sizeof(tmp_output));
3328 memcpy(&tmp_output, sout, sizeof(tmp_output));
3329
e1986656
DG		 3330 if (output->max_size != (uint64_t) -1ULL) {
3331 tmp_output.max_size = output->max_size;
3332 }
3333
d07ceecd
MD		 3334 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3335 tmp_output.max_size);
3336 if (nb_packets_per_stream < 0) {
68808f4e
DG		 3337 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3338 goto error;
3339 }
3340
e1986656
DG		 3341 /* Use temporary name. */
3342 if (*output->name != '\0') {
3343 strncpy(tmp_output.name, output->name,
3344 sizeof(tmp_output.name));
3345 }
3346
1bfe7328
DG		 3347 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3348
e1986656 3349 ret = record_kernel_snapshot(ksess, &tmp_output,
d07ceecd 3350 session, wait, nb_packets_per_stream);
a934f4af 3351 if (ret != LTTNG_OK) {
6dc3064a
DG		 3352 rcu_read_unlock();
3353 goto error;
3354 }
1bfe7328 3355 snapshot_success = 1;
6dc3064a
DG		 3356 }
3357 rcu_read_unlock();
3358 }
3359 }
3360
3361 if (session->ust_session) {
3362 struct ltt_ust_session *usess = session->ust_session;
3363
e1986656 3364 if (use_tmp_output) {
d07ceecd
MD		 3365 int64_t nb_packets_per_stream;
3366
3367 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3368 tmp_output.max_size);
3369 if (nb_packets_per_stream < 0) {
3370 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3371 goto error;
3372 }
e1986656 3373 ret = record_ust_snapshot(usess, &tmp_output, session,
d07ceecd 3374 wait, nb_packets_per_stream);
a934f4af 3375 if (ret != LTTNG_OK) {
6dc3064a
DG		 3376 goto error;
3377 }
1bfe7328 3378 snapshot_success = 1;
6dc3064a
DG		 3379 } else {
3380 struct snapshot_output *sout;
3381 struct lttng_ht_iter iter;
3382
3383 rcu_read_lock();
3384 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3385 &iter.iter, sout, node.node) {
d07ceecd
MD		 3386 int64_t nb_packets_per_stream;
3387
e1986656
DG		 3388 /*
3389 * Make a local copy of the output and assign the possible
3390 * temporary value given by the caller.
3391 */
3392 memset(&tmp_output, 0, sizeof(tmp_output));
3393 memcpy(&tmp_output, sout, sizeof(tmp_output));
3394
e1986656
DG		 3395 if (output->max_size != (uint64_t) -1ULL) {
3396 tmp_output.max_size = output->max_size;
3397 }
3398
d07ceecd
MD		 3399 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3400 tmp_output.max_size);
3401 if (nb_packets_per_stream < 0) {
68808f4e 3402 ret = LTTNG_ERR_MAX_SIZE_INVALID;
d07ceecd 3403 rcu_read_unlock();
68808f4e
DG		 3404 goto error;
3405 }
3406
e1986656
DG		 3407 /* Use temporary name. */
3408 if (*output->name != '\0') {
3409 strncpy(tmp_output.name, output->name,
3410 sizeof(tmp_output.name));
3411 }
3412
1bfe7328
DG		 3413 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3414
e1986656 3415 ret = record_ust_snapshot(usess, &tmp_output, session,
d07ceecd 3416 wait, nb_packets_per_stream);
a934f4af 3417 if (ret != LTTNG_OK) {
6dc3064a
DG		 3418 rcu_read_unlock();
3419 goto error;
3420 }
1bfe7328 3421 snapshot_success = 1;
6dc3064a
DG		 3422 }
3423 rcu_read_unlock();
3424 }
3425 }
3426
1bfe7328
DG		 3427 if (snapshot_success) {
3428 session->snapshot.nb_snapshot++;
b67578cb
MD		 3429 } else {
3430 ret = LTTNG_ERR_SNAPSHOT_FAIL;
1bfe7328
DG		 3431 }
3432
6dc3064a 3433error:
6dc3064a
DG		 3434 return ret;
3435}
3436
d7ba1388
MD		 3437/*
3438 * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
3439 */
3440int cmd_set_session_shm_path(struct ltt_session *session,
3441 const char *shm_path)
3442{
3443 /* Safety net */
3444 assert(session);
3445
3446 /*
3447 * Can only set shm path before session is started.
3448 */
3449 if (session->has_been_started) {
3450 return LTTNG_ERR_SESSION_STARTED;
3451 }
3452
3453 strncpy(session->shm_path, shm_path,
3454 sizeof(session->shm_path));
3455 session->shm_path[sizeof(session->shm_path) - 1] = '\0';
3456
3457 return 0;
3458}
3459
2f77fc4b
DG		 3460/*
3461 * Init command subsystem.
3462 */
3463void cmd_init(void)
3464{
3465 /*
d88aee68
DG		 3466 * Set network sequence index to 1 for streams to match a relayd
3467 * socket on the consumer side.
2f77fc4b 3468 */
d88aee68
DG		 3469 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3470 relayd_net_seq_idx = 1;
3471 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG		 3472
3473 DBG("Command subsystem initialized");
3474}
LTTng 2.0 tools and control repository
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