2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
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.
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
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.
21 #include <urcu/list.h>
22 #include <urcu/uatomic.h>
24 #include <common/defaults.h>
25 #include <common/common.h>
26 #include <common/sessiond-comm/sessiond-comm.h>
27 #include <common/relayd/relayd.h>
28 #include <common/utils.h>
35 #include "kernel-consumer.h"
36 #include "lttng-sessiond.h"
42 * Used to keep a unique index for each relayd socket created where this value
43 * is associated with streams on the consumer so it can match the right relayd
44 * to send to. It must be accessed with the relayd_net_seq_idx_lock
47 static pthread_mutex_t relayd_net_seq_idx_lock
= PTHREAD_MUTEX_INITIALIZER
;
48 static uint64_t relayd_net_seq_idx
;
51 * Create a session path used by list_lttng_sessions for the case that the
52 * session consumer is on the network.
54 static int build_network_session_path(char *dst
, size_t size
,
55 struct ltt_session
*session
)
57 int ret
, kdata_port
, udata_port
;
58 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
59 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
64 memset(tmp_urls
, 0, sizeof(tmp_urls
));
65 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
67 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
69 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
70 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
71 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
74 if (session
->ust_session
&& session
->ust_session
->consumer
) {
75 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
76 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
79 if (uuri
== NULL
&& kuri
== NULL
) {
80 uri
= &session
->consumer
->dst
.net
.control
;
81 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
82 } else if (kuri
&& uuri
) {
83 ret
= uri_compare(kuri
, uuri
);
87 /* Build uuri URL string */
88 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
95 } else if (kuri
&& uuri
== NULL
) {
97 } else if (uuri
&& kuri
== NULL
) {
101 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
107 * Do we have a UST url set. If yes, this means we have both kernel and UST
110 if (*tmp_uurl
!= '\0') {
111 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
112 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
115 if (kuri
|| (!kuri
&& !uuri
)) {
118 /* No kernel URI, use the UST port. */
121 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, dport
);
129 * Fill lttng_channel array of all channels.
131 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
132 struct lttng_channel
*channels
)
135 struct ltt_kernel_channel
*kchan
;
137 DBG("Listing channels for session %s", session
->name
);
140 case LTTNG_DOMAIN_KERNEL
:
141 /* Kernel channels */
142 if (session
->kernel_session
!= NULL
) {
143 cds_list_for_each_entry(kchan
,
144 &session
->kernel_session
->channel_list
.head
, list
) {
145 /* Copy lttng_channel struct to array */
146 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
147 channels
[i
].enabled
= kchan
->enabled
;
152 case LTTNG_DOMAIN_UST
:
154 struct lttng_ht_iter iter
;
155 struct ltt_ust_channel
*uchan
;
158 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
159 &iter
.iter
, uchan
, node
.node
) {
160 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
161 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
162 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
163 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
164 channels
[i
].attr
.switch_timer_interval
=
165 uchan
->attr
.switch_timer_interval
;
166 channels
[i
].attr
.read_timer_interval
=
167 uchan
->attr
.read_timer_interval
;
168 channels
[i
].enabled
= uchan
->enabled
;
169 switch (uchan
->attr
.output
) {
172 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
186 * Create a list of ust global domain events.
188 static int list_lttng_ust_global_events(char *channel_name
,
189 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
192 unsigned int nb_event
= 0;
193 struct lttng_ht_iter iter
;
194 struct lttng_ht_node_str
*node
;
195 struct ltt_ust_channel
*uchan
;
196 struct ltt_ust_event
*uevent
;
197 struct lttng_event
*tmp
;
199 DBG("Listing UST global events for channel %s", channel_name
);
203 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
204 node
= lttng_ht_iter_get_node_str(&iter
);
206 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
210 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
212 nb_event
+= lttng_ht_get_count(uchan
->events
);
219 DBG3("Listing UST global %d events", nb_event
);
221 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
223 ret
= LTTNG_ERR_FATAL
;
227 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
228 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
229 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
230 tmp
[i
].enabled
= uevent
->enabled
;
232 switch (uevent
->attr
.instrumentation
) {
233 case LTTNG_UST_TRACEPOINT
:
234 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
236 case LTTNG_UST_PROBE
:
237 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
239 case LTTNG_UST_FUNCTION
:
240 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
244 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
245 switch (uevent
->attr
.loglevel_type
) {
246 case LTTNG_UST_LOGLEVEL_ALL
:
247 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
249 case LTTNG_UST_LOGLEVEL_RANGE
:
250 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
252 case LTTNG_UST_LOGLEVEL_SINGLE
:
253 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
256 if (uevent
->filter
) {
271 * Fill lttng_event array of all kernel events in the channel.
273 static int list_lttng_kernel_events(char *channel_name
,
274 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
277 unsigned int nb_event
;
278 struct ltt_kernel_event
*event
;
279 struct ltt_kernel_channel
*kchan
;
281 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
283 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
287 nb_event
= kchan
->event_count
;
289 DBG("Listing events for channel %s", kchan
->channel
->name
);
295 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
296 if (*events
== NULL
) {
297 ret
= LTTNG_ERR_FATAL
;
301 /* Kernel channels */
302 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
303 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
304 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
305 (*events
)[i
].enabled
= event
->enabled
;
307 switch (event
->event
->instrumentation
) {
308 case LTTNG_KERNEL_TRACEPOINT
:
309 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
311 case LTTNG_KERNEL_KRETPROBE
:
312 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
313 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
314 sizeof(struct lttng_kernel_kprobe
));
316 case LTTNG_KERNEL_KPROBE
:
317 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
318 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
319 sizeof(struct lttng_kernel_kprobe
));
321 case LTTNG_KERNEL_FUNCTION
:
322 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
323 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
324 sizeof(struct lttng_kernel_function
));
326 case LTTNG_KERNEL_NOOP
:
327 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
329 case LTTNG_KERNEL_SYSCALL
:
330 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
332 case LTTNG_KERNEL_ALL
:
343 /* Negate the error code to differentiate the size from an error */
348 * Add URI so the consumer output object. Set the correct path depending on the
349 * domain adding the default trace directory.
351 static int add_uri_to_consumer(struct consumer_output
*consumer
,
352 struct lttng_uri
*uri
, int domain
, const char *session_name
)
355 const char *default_trace_dir
;
359 if (consumer
== NULL
) {
360 DBG("No consumer detected. Don't add URI. Stopping.");
361 ret
= LTTNG_ERR_NO_CONSUMER
;
366 case LTTNG_DOMAIN_KERNEL
:
367 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
369 case LTTNG_DOMAIN_UST
:
370 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
374 * This case is possible is we try to add the URI to the global tracing
375 * session consumer object which in this case there is no subdir.
377 default_trace_dir
= "";
380 switch (uri
->dtype
) {
383 DBG2("Setting network URI to consumer");
385 if (consumer
->type
== CONSUMER_DST_NET
) {
386 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
387 consumer
->dst
.net
.control_isset
) ||
388 (uri
->stype
== LTTNG_STREAM_DATA
&&
389 consumer
->dst
.net
.data_isset
)) {
390 ret
= LTTNG_ERR_URL_EXIST
;
394 memset(&consumer
->dst
.net
, 0, sizeof(consumer
->dst
.net
));
397 consumer
->type
= CONSUMER_DST_NET
;
399 /* Set URI into consumer output object */
400 ret
= consumer_set_network_uri(consumer
, uri
);
404 } else if (ret
== 1) {
406 * URI was the same in the consumer so we do not append the subdir
407 * again so to not duplicate output dir.
412 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
413 ret
= consumer_set_subdir(consumer
, session_name
);
415 ret
= LTTNG_ERR_FATAL
;
420 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
421 /* On a new subdir, reappend the default trace dir. */
422 strncat(consumer
->subdir
, default_trace_dir
,
423 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
424 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
429 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
430 memset(consumer
->dst
.trace_path
, 0,
431 sizeof(consumer
->dst
.trace_path
));
432 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
433 sizeof(consumer
->dst
.trace_path
));
434 /* Append default trace dir */
435 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
436 sizeof(consumer
->dst
.trace_path
) -
437 strlen(consumer
->dst
.trace_path
) - 1);
438 /* Flag consumer as local. */
439 consumer
->type
= CONSUMER_DST_LOCAL
;
450 * Init tracing by creating trace directory and sending fds kernel consumer.
452 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
455 struct lttng_ht_iter iter
;
456 struct consumer_socket
*socket
;
462 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
463 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
465 pthread_mutex_lock(socket
->lock
);
466 ret
= kernel_consumer_send_session(socket
, session
);
467 pthread_mutex_unlock(socket
->lock
);
469 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
481 * Create a socket to the relayd using the URI.
483 * On success, the relayd_sock pointer is set to the created socket.
484 * Else, it's stays untouched and a lttcomm error code is returned.
486 static int create_connect_relayd(struct lttng_uri
*uri
,
487 struct lttcomm_relayd_sock
**relayd_sock
)
490 struct lttcomm_relayd_sock
*rsock
;
492 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
493 RELAYD_VERSION_COMM_MINOR
);
495 ret
= LTTNG_ERR_FATAL
;
500 * Connect to relayd so we can proceed with a session creation. This call
501 * can possibly block for an arbitrary amount of time to set the health
502 * state to be in poll execution.
505 ret
= relayd_connect(rsock
);
508 ERR("Unable to reach lttng-relayd");
509 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
513 /* Create socket for control stream. */
514 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
515 DBG3("Creating relayd stream socket from URI");
517 /* Check relayd version */
518 ret
= relayd_version_check(rsock
);
520 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
523 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
524 DBG3("Creating relayd data socket from URI");
526 /* Command is not valid */
527 ERR("Relayd invalid stream type: %d", uri
->stype
);
528 ret
= LTTNG_ERR_INVALID
;
532 *relayd_sock
= rsock
;
537 /* The returned value is not useful since we are on an error path. */
538 (void) relayd_close(rsock
);
546 * Connect to the relayd using URI and send the socket to the right consumer.
548 static int send_consumer_relayd_socket(int domain
, unsigned int session_id
,
549 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
550 struct consumer_socket
*consumer_sock
)
553 struct lttcomm_relayd_sock
*rsock
= NULL
;
555 /* Connect to relayd and make version check if uri is the control. */
556 ret
= create_connect_relayd(relayd_uri
, &rsock
);
557 if (ret
!= LTTNG_OK
) {
562 /* Set the network sequence index if not set. */
563 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
564 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
566 * Increment net_seq_idx because we are about to transfer the
567 * new relayd socket to the consumer.
568 * Assign unique key so the consumer can match streams.
570 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
571 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
574 /* Send relayd socket to consumer. */
575 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
576 relayd_uri
->stype
, session_id
);
578 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
582 /* Flag that the corresponding socket was sent. */
583 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
584 consumer_sock
->control_sock_sent
= 1;
585 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
586 consumer_sock
->data_sock_sent
= 1;
592 * Close socket which was dup on the consumer side. The session daemon does
593 * NOT keep track of the relayd socket(s) once transfer to the consumer.
597 (void) relayd_close(rsock
);
601 if (ret
!= LTTNG_OK
) {
603 * The consumer output for this session should not be used anymore
604 * since the relayd connection failed thus making any tracing or/and
605 * streaming not usable.
607 consumer
->enabled
= 0;
613 * Send both relayd sockets to a specific consumer and domain. This is a
614 * helper function to facilitate sending the information to the consumer for a
617 static int send_consumer_relayd_sockets(int domain
, unsigned int session_id
,
618 struct consumer_output
*consumer
, struct consumer_socket
*sock
)
625 /* Sending control relayd socket. */
626 if (!sock
->control_sock_sent
) {
627 ret
= send_consumer_relayd_socket(domain
, session_id
,
628 &consumer
->dst
.net
.control
, consumer
, sock
);
629 if (ret
!= LTTNG_OK
) {
634 /* Sending data relayd socket. */
635 if (!sock
->data_sock_sent
) {
636 ret
= send_consumer_relayd_socket(domain
, session_id
,
637 &consumer
->dst
.net
.data
, consumer
, sock
);
638 if (ret
!= LTTNG_OK
) {
648 * Setup relayd connections for a tracing session. First creates the socket to
649 * the relayd and send them to the right domain consumer. Consumer type MUST be
652 int cmd_setup_relayd(struct ltt_session
*session
)
655 struct ltt_ust_session
*usess
;
656 struct ltt_kernel_session
*ksess
;
657 struct consumer_socket
*socket
;
658 struct lttng_ht_iter iter
;
662 usess
= session
->ust_session
;
663 ksess
= session
->kernel_session
;
665 DBG("Setting relayd for session %s", session
->name
);
669 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
670 && usess
->consumer
->enabled
) {
671 /* For each consumer socket, send relayd sockets */
672 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
674 pthread_mutex_lock(socket
->lock
);
675 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
->id
,
676 usess
->consumer
, socket
);
677 pthread_mutex_unlock(socket
->lock
);
678 if (ret
!= LTTNG_OK
) {
681 /* Session is now ready for network streaming. */
682 session
->net_handle
= 1;
686 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
687 && ksess
->consumer
->enabled
) {
688 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
690 pthread_mutex_lock(socket
->lock
);
691 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
->id
,
692 ksess
->consumer
, socket
);
693 pthread_mutex_unlock(socket
->lock
);
694 if (ret
!= LTTNG_OK
) {
697 /* Session is now ready for network streaming. */
698 session
->net_handle
= 1;
708 * Start a kernel session by opening all necessary streams.
710 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
713 struct ltt_kernel_channel
*kchan
;
715 /* Open kernel metadata */
716 if (ksess
->metadata
== NULL
&& ksess
->output_traces
) {
717 ret
= kernel_open_metadata(ksess
);
719 ret
= LTTNG_ERR_KERN_META_FAIL
;
724 /* Open kernel metadata stream */
725 if (ksess
->metadata
&& ksess
->metadata_stream_fd
< 0) {
726 ret
= kernel_open_metadata_stream(ksess
);
728 ERR("Kernel create metadata stream failed");
729 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
734 /* For each channel */
735 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
736 if (kchan
->stream_count
== 0) {
737 ret
= kernel_open_channel_stream(kchan
);
739 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
742 /* Update the stream global counter */
743 ksess
->stream_count_global
+= ret
;
747 /* Setup kernel consumer socket and send fds to it */
748 ret
= init_kernel_tracing(ksess
);
750 ret
= LTTNG_ERR_KERN_START_FAIL
;
754 /* This start the kernel tracing */
755 ret
= kernel_start_session(ksess
);
757 ret
= LTTNG_ERR_KERN_START_FAIL
;
761 /* Quiescent wait after starting trace */
762 kernel_wait_quiescent(kernel_tracer_fd
);
773 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
775 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
779 struct ltt_ust_session
*usess
;
781 usess
= session
->ust_session
;
786 case LTTNG_DOMAIN_KERNEL
:
788 ret
= channel_kernel_disable(session
->kernel_session
,
790 if (ret
!= LTTNG_OK
) {
794 kernel_wait_quiescent(kernel_tracer_fd
);
797 case LTTNG_DOMAIN_UST
:
799 struct ltt_ust_channel
*uchan
;
800 struct lttng_ht
*chan_ht
;
802 chan_ht
= usess
->domain_global
.channels
;
804 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
806 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
810 ret
= channel_ust_disable(usess
, uchan
);
811 if (ret
!= LTTNG_OK
) {
817 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
818 case LTTNG_DOMAIN_UST_EXEC_NAME
:
819 case LTTNG_DOMAIN_UST_PID
:
822 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
834 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
836 * The wpipe arguments is used as a notifier for the kernel thread.
838 int cmd_enable_channel(struct ltt_session
*session
,
839 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
842 struct ltt_ust_session
*usess
= session
->ust_session
;
843 struct lttng_ht
*chan_ht
;
849 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
854 * Don't try to enable a channel if the session has been started at
855 * some point in time before. The tracer does not allow it.
857 if (session
->started
) {
858 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
863 * If the session is a live session, remove the switch timer, the
864 * live timer does the same thing but sends also synchronisation
865 * beacons for inactive streams.
867 if (session
->live_timer
> 0) {
868 attr
->attr
.live_timer_interval
= session
->live_timer
;
869 attr
->attr
.switch_timer_interval
= 0;
872 switch (domain
->type
) {
873 case LTTNG_DOMAIN_KERNEL
:
875 struct ltt_kernel_channel
*kchan
;
877 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
878 session
->kernel_session
);
881 * Don't try to create a channel if the session
882 * has been started at some point in time
883 * before. The tracer does not allow it.
885 if (session
->started
) {
886 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
889 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
890 if (attr
->name
[0] != '\0') {
891 session
->kernel_session
->has_non_default_channel
= 1;
894 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
897 if (ret
!= LTTNG_OK
) {
901 kernel_wait_quiescent(kernel_tracer_fd
);
904 case LTTNG_DOMAIN_UST
:
906 struct ltt_ust_channel
*uchan
;
908 chan_ht
= usess
->domain_global
.channels
;
910 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
913 * Don't try to create a channel if the session
914 * has been started at some point in time
915 * before. The tracer does not allow it.
917 if (session
->started
) {
918 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
921 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
922 if (attr
->name
[0] != '\0') {
923 usess
->has_non_default_channel
= 1;
926 ret
= channel_ust_enable(usess
, uchan
);
931 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
942 * Command LTTNG_DISABLE_EVENT processed by the client thread.
944 int cmd_disable_event(struct ltt_session
*session
, int domain
,
945 char *channel_name
, char *event_name
)
952 case LTTNG_DOMAIN_KERNEL
:
954 struct ltt_kernel_channel
*kchan
;
955 struct ltt_kernel_session
*ksess
;
957 ksess
= session
->kernel_session
;
960 * If a non-default channel has been created in the
961 * session, explicitely require that -c chan_name needs
964 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
965 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
969 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
971 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
975 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
976 if (ret
!= LTTNG_OK
) {
980 kernel_wait_quiescent(kernel_tracer_fd
);
983 case LTTNG_DOMAIN_UST
:
985 struct ltt_ust_channel
*uchan
;
986 struct ltt_ust_session
*usess
;
988 usess
= session
->ust_session
;
991 * If a non-default channel has been created in the
992 * session, explicitely require that -c chan_name needs
995 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
996 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1000 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1002 if (uchan
== NULL
) {
1003 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1007 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
1008 if (ret
!= LTTNG_OK
) {
1012 DBG3("Disable UST event %s in channel %s completed", event_name
,
1017 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1018 case LTTNG_DOMAIN_UST_PID
:
1019 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1022 ret
= LTTNG_ERR_UND
;
1034 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1036 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
1044 case LTTNG_DOMAIN_KERNEL
:
1046 struct ltt_kernel_session
*ksess
;
1047 struct ltt_kernel_channel
*kchan
;
1049 ksess
= session
->kernel_session
;
1052 * If a non-default channel has been created in the
1053 * session, explicitely require that -c chan_name needs
1056 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1057 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1061 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1062 if (kchan
== NULL
) {
1063 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1067 ret
= event_kernel_disable_all(kchan
);
1068 if (ret
!= LTTNG_OK
) {
1072 kernel_wait_quiescent(kernel_tracer_fd
);
1075 case LTTNG_DOMAIN_UST
:
1077 struct ltt_ust_session
*usess
;
1078 struct ltt_ust_channel
*uchan
;
1080 usess
= session
->ust_session
;
1083 * If a non-default channel has been created in the
1084 * session, explicitely require that -c chan_name needs
1087 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1088 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1092 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1094 if (uchan
== NULL
) {
1095 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1099 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1104 DBG3("Disable all UST events in channel %s completed", channel_name
);
1109 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1110 case LTTNG_DOMAIN_UST_PID
:
1111 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1114 ret
= LTTNG_ERR_UND
;
1126 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1128 int cmd_add_context(struct ltt_session
*session
, int domain
,
1129 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1131 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1134 case LTTNG_DOMAIN_KERNEL
:
1135 assert(session
->kernel_session
);
1137 if (session
->kernel_session
->channel_count
== 0) {
1138 /* Create default channel */
1139 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1140 if (ret
!= LTTNG_OK
) {
1143 chan_kern_created
= 1;
1145 /* Add kernel context to kernel tracer */
1146 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1147 if (ret
!= LTTNG_OK
) {
1151 case LTTNG_DOMAIN_UST
:
1153 struct ltt_ust_session
*usess
= session
->ust_session
;
1154 unsigned int chan_count
;
1158 chan_count
= lttng_ht_get_count(usess
->domain_global
.channels
);
1159 if (chan_count
== 0) {
1160 struct lttng_channel
*attr
;
1161 /* Create default channel */
1162 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1164 ret
= LTTNG_ERR_FATAL
;
1168 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1169 if (ret
!= LTTNG_OK
) {
1174 chan_ust_created
= 1;
1177 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1178 if (ret
!= LTTNG_OK
) {
1184 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1185 case LTTNG_DOMAIN_UST_PID
:
1186 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1189 ret
= LTTNG_ERR_UND
;
1196 if (chan_kern_created
) {
1197 struct ltt_kernel_channel
*kchan
=
1198 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1199 session
->kernel_session
);
1200 /* Created previously, this should NOT fail. */
1202 kernel_destroy_channel(kchan
);
1205 if (chan_ust_created
) {
1206 struct ltt_ust_channel
*uchan
=
1207 trace_ust_find_channel_by_name(
1208 session
->ust_session
->domain_global
.channels
,
1209 DEFAULT_CHANNEL_NAME
);
1210 /* Created previously, this should NOT fail. */
1212 /* Remove from the channel list of the session. */
1213 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1215 trace_ust_destroy_channel(uchan
);
1221 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1223 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1224 char *channel_name
, struct lttng_event
*event
,
1225 struct lttng_filter_bytecode
*filter
, int wpipe
)
1227 int ret
, channel_created
= 0;
1228 struct lttng_channel
*attr
;
1232 assert(channel_name
);
1236 switch (domain
->type
) {
1237 case LTTNG_DOMAIN_KERNEL
:
1239 struct ltt_kernel_channel
*kchan
;
1242 * If a non-default channel has been created in the
1243 * session, explicitely require that -c chan_name needs
1246 if (session
->kernel_session
->has_non_default_channel
1247 && channel_name
[0] == '\0') {
1248 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1252 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1253 session
->kernel_session
);
1254 if (kchan
== NULL
) {
1255 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1256 LTTNG_BUFFER_GLOBAL
);
1258 ret
= LTTNG_ERR_FATAL
;
1261 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1263 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1264 if (ret
!= LTTNG_OK
) {
1270 channel_created
= 1;
1273 /* Get the newly created kernel channel pointer */
1274 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1275 session
->kernel_session
);
1276 if (kchan
== NULL
) {
1277 /* This sould not happen... */
1278 ret
= LTTNG_ERR_FATAL
;
1282 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1283 if (ret
!= LTTNG_OK
) {
1284 if (channel_created
) {
1285 /* Let's not leak a useless channel. */
1286 kernel_destroy_channel(kchan
);
1291 kernel_wait_quiescent(kernel_tracer_fd
);
1294 case LTTNG_DOMAIN_UST
:
1296 struct ltt_ust_channel
*uchan
;
1297 struct ltt_ust_session
*usess
= session
->ust_session
;
1302 * If a non-default channel has been created in the
1303 * session, explicitely require that -c chan_name needs
1306 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1307 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1311 /* Get channel from global UST domain */
1312 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1314 if (uchan
== NULL
) {
1315 /* Create default channel */
1316 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1317 usess
->buffer_type
);
1319 ret
= LTTNG_ERR_FATAL
;
1322 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1324 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1325 if (ret
!= LTTNG_OK
) {
1331 /* Get the newly created channel reference back */
1332 uchan
= trace_ust_find_channel_by_name(
1333 usess
->domain_global
.channels
, channel_name
);
1337 /* At this point, the session and channel exist on the tracer */
1338 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
, filter
);
1339 if (ret
!= LTTNG_OK
) {
1345 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1346 case LTTNG_DOMAIN_UST_PID
:
1347 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1350 ret
= LTTNG_ERR_UND
;
1362 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1364 int cmd_enable_event_all(struct ltt_session
*session
,
1365 struct lttng_domain
*domain
, char *channel_name
, int event_type
,
1366 struct lttng_filter_bytecode
*filter
, int wpipe
)
1369 struct lttng_channel
*attr
;
1372 assert(channel_name
);
1376 switch (domain
->type
) {
1377 case LTTNG_DOMAIN_KERNEL
:
1379 struct ltt_kernel_channel
*kchan
;
1381 assert(session
->kernel_session
);
1384 * If a non-default channel has been created in the
1385 * session, explicitely require that -c chan_name needs
1388 if (session
->kernel_session
->has_non_default_channel
1389 && channel_name
[0] == '\0') {
1390 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1394 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1395 session
->kernel_session
);
1396 if (kchan
== NULL
) {
1397 /* Create default channel */
1398 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1399 LTTNG_BUFFER_GLOBAL
);
1401 ret
= LTTNG_ERR_FATAL
;
1404 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1406 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1407 if (ret
!= LTTNG_OK
) {
1413 /* Get the newly created kernel channel pointer */
1414 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1415 session
->kernel_session
);
1419 switch (event_type
) {
1420 case LTTNG_EVENT_SYSCALL
:
1421 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1423 case LTTNG_EVENT_TRACEPOINT
:
1425 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1426 * events already registered to the channel.
1428 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1430 case LTTNG_EVENT_ALL
:
1431 /* Enable syscalls and tracepoints */
1432 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1435 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1439 /* Manage return value */
1440 if (ret
!= LTTNG_OK
) {
1442 * On error, cmd_enable_channel call will take care of destroying
1443 * the created channel if it was needed.
1448 kernel_wait_quiescent(kernel_tracer_fd
);
1451 case LTTNG_DOMAIN_UST
:
1453 struct ltt_ust_channel
*uchan
;
1454 struct ltt_ust_session
*usess
= session
->ust_session
;
1459 * If a non-default channel has been created in the
1460 * session, explicitely require that -c chan_name needs
1463 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1464 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1468 /* Get channel from global UST domain */
1469 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1471 if (uchan
== NULL
) {
1472 /* Create default channel */
1473 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1474 usess
->buffer_type
);
1476 ret
= LTTNG_ERR_FATAL
;
1479 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1481 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1482 if (ret
!= LTTNG_OK
) {
1488 /* Get the newly created channel reference back */
1489 uchan
= trace_ust_find_channel_by_name(
1490 usess
->domain_global
.channels
, channel_name
);
1494 /* At this point, the session and channel exist on the tracer */
1496 switch (event_type
) {
1497 case LTTNG_EVENT_ALL
:
1498 case LTTNG_EVENT_TRACEPOINT
:
1499 ret
= event_ust_enable_all_tracepoints(usess
, uchan
, filter
);
1500 if (ret
!= LTTNG_OK
) {
1505 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1509 /* Manage return value */
1510 if (ret
!= LTTNG_OK
) {
1517 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1518 case LTTNG_DOMAIN_UST_PID
:
1519 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1522 ret
= LTTNG_ERR_UND
;
1535 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1537 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1540 ssize_t nb_events
= 0;
1543 case LTTNG_DOMAIN_KERNEL
:
1544 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1545 if (nb_events
< 0) {
1546 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1550 case LTTNG_DOMAIN_UST
:
1551 nb_events
= ust_app_list_events(events
);
1552 if (nb_events
< 0) {
1553 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1558 ret
= LTTNG_ERR_UND
;
1565 /* Return negative value to differentiate return code */
1570 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1572 ssize_t
cmd_list_tracepoint_fields(int domain
,
1573 struct lttng_event_field
**fields
)
1576 ssize_t nb_fields
= 0;
1579 case LTTNG_DOMAIN_UST
:
1580 nb_fields
= ust_app_list_event_fields(fields
);
1581 if (nb_fields
< 0) {
1582 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1586 case LTTNG_DOMAIN_KERNEL
:
1587 default: /* fall-through */
1588 ret
= LTTNG_ERR_UND
;
1595 /* Return negative value to differentiate return code */
1600 * Command LTTNG_START_TRACE processed by the client thread.
1602 int cmd_start_trace(struct ltt_session
*session
)
1605 struct ltt_kernel_session
*ksession
;
1606 struct ltt_ust_session
*usess
;
1610 /* Ease our life a bit ;) */
1611 ksession
= session
->kernel_session
;
1612 usess
= session
->ust_session
;
1614 if (session
->enabled
) {
1615 /* Already started. */
1616 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1620 session
->enabled
= 1;
1622 /* Kernel tracing */
1623 if (ksession
!= NULL
) {
1624 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1625 if (ret
!= LTTNG_OK
) {
1630 /* Flag session that trace should start automatically */
1632 usess
->start_trace
= 1;
1634 ret
= ust_app_start_trace_all(usess
);
1636 ret
= LTTNG_ERR_UST_START_FAIL
;
1641 session
->started
= 1;
1650 * Command LTTNG_STOP_TRACE processed by the client thread.
1652 int cmd_stop_trace(struct ltt_session
*session
)
1655 struct ltt_kernel_channel
*kchan
;
1656 struct ltt_kernel_session
*ksession
;
1657 struct ltt_ust_session
*usess
;
1662 ksession
= session
->kernel_session
;
1663 usess
= session
->ust_session
;
1665 if (!session
->enabled
) {
1666 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1670 session
->enabled
= 0;
1673 if (ksession
&& ksession
->started
) {
1674 DBG("Stop kernel tracing");
1676 /* Flush metadata if exist */
1677 if (ksession
->metadata_stream_fd
>= 0) {
1678 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1680 ERR("Kernel metadata flush failed");
1684 /* Flush all buffers before stopping */
1685 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1686 ret
= kernel_flush_buffer(kchan
);
1688 ERR("Kernel flush buffer error");
1692 ret
= kernel_stop_session(ksession
);
1694 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1698 kernel_wait_quiescent(kernel_tracer_fd
);
1700 ksession
->started
= 0;
1703 if (usess
&& usess
->start_trace
) {
1704 usess
->start_trace
= 0;
1706 ret
= ust_app_stop_trace_all(usess
);
1708 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1720 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1722 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1723 size_t nb_uri
, struct lttng_uri
*uris
)
1726 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1727 struct ltt_ust_session
*usess
= session
->ust_session
;
1728 struct consumer_output
*consumer
= NULL
;
1734 /* Can't enable consumer after session started. */
1735 if (session
->enabled
) {
1736 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1741 * This case switch makes sure the domain session has a temporary consumer
1742 * so the URL can be set.
1746 /* Code flow error. A session MUST always have a consumer object */
1747 assert(session
->consumer
);
1749 * The URL will be added to the tracing session consumer instead of a
1750 * specific domain consumer.
1752 consumer
= session
->consumer
;
1754 case LTTNG_DOMAIN_KERNEL
:
1755 /* Code flow error if we don't have a kernel session here. */
1757 assert(ksess
->consumer
);
1758 consumer
= ksess
->consumer
;
1760 case LTTNG_DOMAIN_UST
:
1761 /* Code flow error if we don't have a kernel session here. */
1763 assert(usess
->consumer
);
1764 consumer
= usess
->consumer
;
1768 for (i
= 0; i
< nb_uri
; i
++) {
1769 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1770 if (ret
!= LTTNG_OK
) {
1783 * Command LTTNG_CREATE_SESSION processed by the client thread.
1785 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1786 size_t nb_uri
, lttng_sock_cred
*creds
, unsigned int live_timer
)
1789 struct ltt_session
*session
;
1795 * Verify if the session already exist
1797 * XXX: There is no need for the session lock list here since the caller
1798 * (process_client_msg) is holding it. We might want to change that so a
1799 * single command does not lock the entire session list.
1801 session
= session_find_by_name(name
);
1802 if (session
!= NULL
) {
1803 ret
= LTTNG_ERR_EXIST_SESS
;
1807 /* Create tracing session in the registry */
1808 ret
= session_create(name
, LTTNG_SOCK_GET_UID_CRED(creds
),
1809 LTTNG_SOCK_GET_GID_CRED(creds
));
1810 if (ret
!= LTTNG_OK
) {
1815 * Get the newly created session pointer back
1817 * XXX: There is no need for the session lock list here since the caller
1818 * (process_client_msg) is holding it. We might want to change that so a
1819 * single command does not lock the entire session list.
1821 session
= session_find_by_name(name
);
1824 session
->live_timer
= live_timer
;
1825 /* Create default consumer output for the session not yet created. */
1826 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1827 if (session
->consumer
== NULL
) {
1828 ret
= LTTNG_ERR_FATAL
;
1829 goto consumer_error
;
1833 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1834 if (ret
!= LTTNG_OK
) {
1835 goto consumer_error
;
1837 session
->output_traces
= 1;
1839 session
->output_traces
= 0;
1840 DBG2("Session %s created with no output", session
->name
);
1843 session
->consumer
->enabled
= 1;
1848 session_destroy(session
);
1855 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
1857 int cmd_create_session_snapshot(char *name
, struct lttng_uri
*uris
,
1858 size_t nb_uri
, lttng_sock_cred
*creds
)
1861 struct ltt_session
*session
;
1862 struct snapshot_output
*new_output
= NULL
;
1868 * Create session in no output mode with URIs set to NULL. The uris we've
1869 * received are for a default snapshot output if one.
1871 ret
= cmd_create_session_uri(name
, NULL
, 0, creds
, -1);
1872 if (ret
!= LTTNG_OK
) {
1876 /* Get the newly created session pointer back. This should NEVER fail. */
1877 session
= session_find_by_name(name
);
1880 /* Flag session for snapshot mode. */
1881 session
->snapshot_mode
= 1;
1883 /* Skip snapshot output creation if no URI is given. */
1888 new_output
= snapshot_output_alloc();
1890 ret
= LTTNG_ERR_NOMEM
;
1891 goto error_snapshot_alloc
;
1894 ret
= snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE
, NULL
,
1895 uris
, nb_uri
, session
->consumer
, new_output
, &session
->snapshot
);
1897 if (ret
== -ENOMEM
) {
1898 ret
= LTTNG_ERR_NOMEM
;
1900 ret
= LTTNG_ERR_INVALID
;
1902 goto error_snapshot
;
1906 snapshot_add_output(&session
->snapshot
, new_output
);
1913 snapshot_output_destroy(new_output
);
1914 error_snapshot_alloc
:
1915 session_destroy(session
);
1921 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1923 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1926 struct ltt_ust_session
*usess
;
1927 struct ltt_kernel_session
*ksess
;
1932 usess
= session
->ust_session
;
1933 ksess
= session
->kernel_session
;
1935 /* Clean kernel session teardown */
1936 kernel_destroy_session(ksess
);
1938 /* UST session teardown */
1940 /* Close any relayd session */
1941 consumer_output_send_destroy_relayd(usess
->consumer
);
1943 /* Destroy every UST application related to this session. */
1944 ret
= ust_app_destroy_trace_all(usess
);
1946 ERR("Error in ust_app_destroy_trace_all");
1949 /* Clean up the rest. */
1950 trace_ust_destroy_session(usess
);
1954 * Must notify the kernel thread here to update it's poll set in order to
1955 * remove the channel(s)' fd just destroyed.
1957 ret
= notify_thread_pipe(wpipe
);
1959 PERROR("write kernel poll pipe");
1962 ret
= session_destroy(session
);
1968 * Command LTTNG_CALIBRATE processed by the client thread.
1970 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1975 case LTTNG_DOMAIN_KERNEL
:
1977 struct lttng_kernel_calibrate kcalibrate
;
1979 kcalibrate
.type
= calibrate
->type
;
1980 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1982 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1987 case LTTNG_DOMAIN_UST
:
1989 struct lttng_ust_calibrate ucalibrate
;
1991 ucalibrate
.type
= calibrate
->type
;
1992 ret
= ust_app_calibrate_glb(&ucalibrate
);
1994 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
2000 ret
= LTTNG_ERR_UND
;
2011 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2013 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2014 const char *sock_path
, struct consumer_data
*cdata
)
2017 struct consumer_socket
*socket
= NULL
;
2024 case LTTNG_DOMAIN_KERNEL
:
2026 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2030 /* Can't register a consumer if there is already one */
2031 if (ksess
->consumer_fds_sent
!= 0) {
2032 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2036 sock
= lttcomm_connect_unix_sock(sock_path
);
2038 ret
= LTTNG_ERR_CONNECT_FAIL
;
2041 cdata
->cmd_sock
= sock
;
2043 socket
= consumer_allocate_socket(&cdata
->cmd_sock
);
2044 if (socket
== NULL
) {
2047 PERROR("close register consumer");
2049 cdata
->cmd_sock
= -1;
2050 ret
= LTTNG_ERR_FATAL
;
2054 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
2055 if (socket
->lock
== NULL
) {
2056 PERROR("zmalloc pthread mutex");
2057 ret
= LTTNG_ERR_FATAL
;
2060 pthread_mutex_init(socket
->lock
, NULL
);
2061 socket
->registered
= 1;
2064 consumer_add_socket(socket
, ksess
->consumer
);
2067 pthread_mutex_lock(&cdata
->pid_mutex
);
2069 pthread_mutex_unlock(&cdata
->pid_mutex
);
2074 /* TODO: Userspace tracing */
2075 ret
= LTTNG_ERR_UND
;
2083 consumer_destroy_socket(socket
);
2089 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2091 ssize_t
cmd_list_domains(struct ltt_session
*session
,
2092 struct lttng_domain
**domains
)
2097 if (session
->kernel_session
!= NULL
) {
2098 DBG3("Listing domains found kernel domain");
2102 if (session
->ust_session
!= NULL
) {
2103 DBG3("Listing domains found UST global domain");
2107 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2108 if (*domains
== NULL
) {
2109 ret
= LTTNG_ERR_FATAL
;
2113 if (session
->kernel_session
!= NULL
) {
2114 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2118 if (session
->ust_session
!= NULL
) {
2119 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2120 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2127 /* Return negative value to differentiate return code */
2133 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2135 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
2136 struct lttng_channel
**channels
)
2139 ssize_t nb_chan
= 0;
2142 case LTTNG_DOMAIN_KERNEL
:
2143 if (session
->kernel_session
!= NULL
) {
2144 nb_chan
= session
->kernel_session
->channel_count
;
2146 DBG3("Number of kernel channels %zd", nb_chan
);
2148 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2151 case LTTNG_DOMAIN_UST
:
2152 if (session
->ust_session
!= NULL
) {
2153 nb_chan
= lttng_ht_get_count(
2154 session
->ust_session
->domain_global
.channels
);
2156 DBG3("Number of UST global channels %zd", nb_chan
);
2158 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2163 ret
= LTTNG_ERR_UND
;
2168 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2169 if (*channels
== NULL
) {
2170 ret
= LTTNG_ERR_FATAL
;
2174 list_lttng_channels(domain
, session
, *channels
);
2177 /* Ret value was set in the domain switch case */
2184 /* Return negative value to differentiate return code */
2189 * Command LTTNG_LIST_EVENTS processed by the client thread.
2191 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2192 char *channel_name
, struct lttng_event
**events
)
2195 ssize_t nb_event
= 0;
2198 case LTTNG_DOMAIN_KERNEL
:
2199 if (session
->kernel_session
!= NULL
) {
2200 nb_event
= list_lttng_kernel_events(channel_name
,
2201 session
->kernel_session
, events
);
2204 case LTTNG_DOMAIN_UST
:
2206 if (session
->ust_session
!= NULL
) {
2207 nb_event
= list_lttng_ust_global_events(channel_name
,
2208 &session
->ust_session
->domain_global
, events
);
2213 ret
= LTTNG_ERR_UND
;
2220 /* Return negative value to differentiate return code */
2225 * Using the session list, filled a lttng_session array to send back to the
2226 * client for session listing.
2228 * The session list lock MUST be acquired before calling this function. Use
2229 * session_lock_list() and session_unlock_list().
2231 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2236 struct ltt_session
*session
;
2237 struct ltt_session_list
*list
= session_get_list();
2239 DBG("Getting all available session for UID %d GID %d",
2242 * Iterate over session list and append data after the control struct in
2245 cds_list_for_each_entry(session
, &list
->head
, list
) {
2247 * Only list the sessions the user can control.
2249 if (!session_access_ok(session
, uid
, gid
)) {
2253 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2254 struct ltt_ust_session
*usess
= session
->ust_session
;
2256 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2257 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2258 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2259 ret
= build_network_session_path(sessions
[i
].path
,
2260 sizeof(sessions
[i
].path
), session
);
2262 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
2263 session
->consumer
->dst
.trace_path
);
2266 PERROR("snprintf session path");
2270 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2271 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2272 sessions
[i
].enabled
= session
->enabled
;
2273 sessions
[i
].snapshot_mode
= session
->snapshot_mode
;
2279 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2280 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2282 int cmd_data_pending(struct ltt_session
*session
)
2285 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2286 struct ltt_ust_session
*usess
= session
->ust_session
;
2290 /* Session MUST be stopped to ask for data availability. */
2291 if (session
->enabled
) {
2292 ret
= LTTNG_ERR_SESSION_STARTED
;
2296 if (ksess
&& ksess
->consumer
) {
2297 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2299 /* Data is still being extracted for the kernel. */
2304 if (usess
&& usess
->consumer
) {
2305 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2307 /* Data is still being extracted for the kernel. */
2312 /* Data is ready to be read by a viewer */
2320 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2322 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2324 int cmd_snapshot_add_output(struct ltt_session
*session
,
2325 struct lttng_snapshot_output
*output
, uint32_t *id
)
2328 struct snapshot_output
*new_output
;
2333 DBG("Cmd snapshot add output for session %s", session
->name
);
2336 * Permission denied to create an output if the session is not
2337 * set in no output mode.
2339 if (session
->output_traces
) {
2340 ret
= LTTNG_ERR_EPERM
;
2344 /* Only one output is allowed until we have the "tee" feature. */
2345 if (session
->snapshot
.nb_output
== 1) {
2346 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
2350 new_output
= snapshot_output_alloc();
2352 ret
= LTTNG_ERR_NOMEM
;
2356 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2357 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
2358 &session
->snapshot
);
2360 if (ret
== -ENOMEM
) {
2361 ret
= LTTNG_ERR_NOMEM
;
2363 ret
= LTTNG_ERR_INVALID
;
2369 snapshot_add_output(&session
->snapshot
, new_output
);
2371 *id
= new_output
->id
;
2378 snapshot_output_destroy(new_output
);
2384 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2386 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2388 int cmd_snapshot_del_output(struct ltt_session
*session
,
2389 struct lttng_snapshot_output
*output
)
2392 struct snapshot_output
*sout
= NULL
;
2400 * Permission denied to create an output if the session is not
2401 * set in no output mode.
2403 if (session
->output_traces
) {
2404 ret
= LTTNG_ERR_EPERM
;
2409 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
2411 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
2412 } else if (*output
->name
!= '\0') {
2413 DBG("Cmd snapshot del output name %s for session %s", output
->name
,
2415 sout
= snapshot_find_output_by_name(output
->name
, &session
->snapshot
);
2418 ret
= LTTNG_ERR_INVALID
;
2422 snapshot_delete_output(&session
->snapshot
, sout
);
2423 snapshot_output_destroy(sout
);
2432 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2434 * If no output is available, outputs is untouched and 0 is returned.
2436 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2438 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
2439 struct lttng_snapshot_output
**outputs
)
2442 struct lttng_snapshot_output
*list
;
2443 struct lttng_ht_iter iter
;
2444 struct snapshot_output
*output
;
2449 DBG("Cmd snapshot list outputs for session %s", session
->name
);
2452 * Permission denied to create an output if the session is not
2453 * set in no output mode.
2455 if (session
->output_traces
) {
2456 ret
= LTTNG_ERR_EPERM
;
2460 if (session
->snapshot
.nb_output
== 0) {
2465 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
2467 ret
= LTTNG_ERR_NOMEM
;
2471 /* Copy list from session to the new list object. */
2472 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
2473 output
, node
.node
) {
2474 assert(output
->consumer
);
2475 list
[idx
].id
= output
->id
;
2476 list
[idx
].max_size
= output
->max_size
;
2477 strncpy(list
[idx
].name
, output
->name
, sizeof(list
[idx
].name
));
2478 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
2479 strncpy(list
[idx
].ctrl_url
, output
->consumer
->dst
.trace_path
,
2480 sizeof(list
[idx
].ctrl_url
));
2483 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
2484 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
2486 ret
= LTTNG_ERR_NOMEM
;
2491 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
2492 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
2494 ret
= LTTNG_ERR_NOMEM
;
2502 return session
->snapshot
.nb_output
;
2511 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2512 * snapshot output is *not* set with a remote destination.
2514 * Return 0 on success or a LTTNG_ERR code.
2516 static int set_relayd_for_snapshot(struct consumer_output
*consumer
,
2517 struct snapshot_output
*snap_output
, struct ltt_session
*session
)
2520 struct lttng_ht_iter iter
;
2521 struct consumer_socket
*socket
;
2524 assert(snap_output
);
2527 DBG2("Set relayd object from snapshot output");
2529 /* Ignore if snapshot consumer output is not network. */
2530 if (snap_output
->consumer
->type
!= CONSUMER_DST_NET
) {
2535 * For each consumer socket, create and send the relayd object of the
2539 cds_lfht_for_each_entry(snap_output
->consumer
->socks
->ht
, &iter
.iter
,
2540 socket
, node
.node
) {
2541 ret
= send_consumer_relayd_sockets(0, session
->id
,
2542 snap_output
->consumer
, socket
);
2543 if (ret
!= LTTNG_OK
) {
2555 * Record a kernel snapshot.
2557 * Return 0 on success or a LTTNG_ERR code.
2559 static int record_kernel_snapshot(struct ltt_kernel_session
*ksess
,
2560 struct snapshot_output
*output
, struct ltt_session
*session
,
2561 int wait
, int nb_streams
)
2569 /* Get the datetime for the snapshot output directory. */
2570 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
2571 sizeof(output
->datetime
));
2573 ret
= LTTNG_ERR_INVALID
;
2578 * Copy kernel session sockets so we can communicate with the right
2579 * consumer for the snapshot record command.
2581 ret
= consumer_copy_sockets(output
->consumer
, ksess
->consumer
);
2583 ret
= LTTNG_ERR_NOMEM
;
2587 ret
= set_relayd_for_snapshot(ksess
->consumer
, output
, session
);
2588 if (ret
!= LTTNG_OK
) {
2589 goto error_snapshot
;
2592 ret
= kernel_snapshot_record(ksess
, output
, wait
, nb_streams
);
2593 if (ret
!= LTTNG_OK
) {
2594 goto error_snapshot
;
2600 /* Clean up copied sockets so this output can use some other later on. */
2601 consumer_destroy_output_sockets(output
->consumer
);
2607 * Record a UST snapshot.
2609 * Return 0 on success or a LTTNG_ERR error code.
2611 static int record_ust_snapshot(struct ltt_ust_session
*usess
,
2612 struct snapshot_output
*output
, struct ltt_session
*session
,
2613 int wait
, int nb_streams
)
2621 /* Get the datetime for the snapshot output directory. */
2622 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
2623 sizeof(output
->datetime
));
2625 ret
= LTTNG_ERR_INVALID
;
2630 * Copy UST session sockets so we can communicate with the right
2631 * consumer for the snapshot record command.
2633 ret
= consumer_copy_sockets(output
->consumer
, usess
->consumer
);
2635 ret
= LTTNG_ERR_NOMEM
;
2639 ret
= set_relayd_for_snapshot(usess
->consumer
, output
, session
);
2640 if (ret
!= LTTNG_OK
) {
2641 goto error_snapshot
;
2644 ret
= ust_app_snapshot_record(usess
, output
, wait
, nb_streams
);
2646 if (ret
== -EINVAL
) {
2647 ret
= LTTNG_ERR_INVALID
;
2648 goto error_snapshot
;
2651 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
2652 goto error_snapshot
;
2658 /* Clean up copied sockets so this output can use some other later on. */
2659 consumer_destroy_output_sockets(output
->consumer
);
2665 * Returns the total number of streams for a session or a negative value
2668 static unsigned int get_total_nb_stream(struct ltt_session
*session
)
2670 unsigned int total_streams
= 0;
2672 if (session
->kernel_session
) {
2673 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2675 total_streams
+= ksess
->stream_count_global
;
2678 if (session
->ust_session
) {
2679 struct ltt_ust_session
*usess
= session
->ust_session
;
2681 total_streams
+= ust_app_get_nb_stream(usess
);
2684 return total_streams
;
2688 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2690 * The wait parameter is ignored so this call always wait for the snapshot to
2691 * complete before returning.
2693 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2695 int cmd_snapshot_record(struct ltt_session
*session
,
2696 struct lttng_snapshot_output
*output
, int wait
)
2699 unsigned int use_tmp_output
= 0;
2700 struct snapshot_output tmp_output
;
2701 unsigned int nb_streams
, snapshot_success
= 0;
2705 DBG("Cmd snapshot record for session %s", session
->name
);
2708 * Permission denied to create an output if the session is not
2709 * set in no output mode.
2711 if (session
->output_traces
) {
2712 ret
= LTTNG_ERR_EPERM
;
2716 /* The session needs to be started at least once. */
2717 if (!session
->started
) {
2718 ret
= LTTNG_ERR_START_SESSION_ONCE
;
2722 /* Use temporary output for the session. */
2723 if (output
&& *output
->ctrl_url
!= '\0') {
2724 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2725 output
->ctrl_url
, output
->data_url
, session
->consumer
,
2728 if (ret
== -ENOMEM
) {
2729 ret
= LTTNG_ERR_NOMEM
;
2731 ret
= LTTNG_ERR_INVALID
;
2735 /* Use the global session count for the temporary snapshot. */
2736 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
2741 * Get the total number of stream of that session which is used by the
2742 * maximum size of the snapshot feature.
2744 nb_streams
= get_total_nb_stream(session
);
2746 if (session
->kernel_session
) {
2747 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2749 if (use_tmp_output
) {
2750 ret
= record_kernel_snapshot(ksess
, &tmp_output
, session
,
2752 if (ret
!= LTTNG_OK
) {
2755 snapshot_success
= 1;
2757 struct snapshot_output
*sout
;
2758 struct lttng_ht_iter iter
;
2761 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
2762 &iter
.iter
, sout
, node
.node
) {
2764 * Make a local copy of the output and assign the possible
2765 * temporary value given by the caller.
2767 memset(&tmp_output
, 0, sizeof(tmp_output
));
2768 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
2770 /* Use temporary max size. */
2771 if (output
->max_size
!= (uint64_t) -1ULL) {
2772 tmp_output
.max_size
= output
->max_size
;
2775 /* Use temporary name. */
2776 if (*output
->name
!= '\0') {
2777 strncpy(tmp_output
.name
, output
->name
,
2778 sizeof(tmp_output
.name
));
2781 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
2783 ret
= record_kernel_snapshot(ksess
, &tmp_output
,
2784 session
, wait
, nb_streams
);
2785 if (ret
!= LTTNG_OK
) {
2789 snapshot_success
= 1;
2795 if (session
->ust_session
) {
2796 struct ltt_ust_session
*usess
= session
->ust_session
;
2798 if (use_tmp_output
) {
2799 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
2801 if (ret
!= LTTNG_OK
) {
2804 snapshot_success
= 1;
2806 struct snapshot_output
*sout
;
2807 struct lttng_ht_iter iter
;
2810 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
2811 &iter
.iter
, sout
, node
.node
) {
2813 * Make a local copy of the output and assign the possible
2814 * temporary value given by the caller.
2816 memset(&tmp_output
, 0, sizeof(tmp_output
));
2817 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
2819 /* Use temporary max size. */
2820 if (output
->max_size
!= (uint64_t) -1ULL) {
2821 tmp_output
.max_size
= output
->max_size
;
2824 /* Use temporary name. */
2825 if (*output
->name
!= '\0') {
2826 strncpy(tmp_output
.name
, output
->name
,
2827 sizeof(tmp_output
.name
));
2830 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
2832 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
2834 if (ret
!= LTTNG_OK
) {
2838 snapshot_success
= 1;
2844 if (snapshot_success
) {
2845 session
->snapshot
.nb_snapshot
++;
2847 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
2855 * Init command subsystem.
2860 * Set network sequence index to 1 for streams to match a relayd
2861 * socket on the consumer side.
2863 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
2864 relayd_net_seq_idx
= 1;
2865 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
2867 DBG("Command subsystem initialized");