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 /* Code flow error */
466 assert(socket
->fd
>= 0);
468 pthread_mutex_lock(socket
->lock
);
469 ret
= kernel_consumer_send_session(socket
, session
);
470 pthread_mutex_unlock(socket
->lock
);
472 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
484 * Create a socket to the relayd using the URI.
486 * On success, the relayd_sock pointer is set to the created socket.
487 * Else, it's stays untouched and a lttcomm error code is returned.
489 static int create_connect_relayd(struct lttng_uri
*uri
,
490 struct lttcomm_relayd_sock
**relayd_sock
)
493 struct lttcomm_relayd_sock
*rsock
;
495 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
496 RELAYD_VERSION_COMM_MINOR
);
498 ret
= LTTNG_ERR_FATAL
;
503 * Connect to relayd so we can proceed with a session creation. This call
504 * can possibly block for an arbitrary amount of time to set the health
505 * state to be in poll execution.
508 ret
= relayd_connect(rsock
);
511 ERR("Unable to reach lttng-relayd");
512 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
516 /* Create socket for control stream. */
517 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
518 DBG3("Creating relayd stream socket from URI");
520 /* Check relayd version */
521 ret
= relayd_version_check(rsock
);
523 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
526 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
527 DBG3("Creating relayd data socket from URI");
529 /* Command is not valid */
530 ERR("Relayd invalid stream type: %d", uri
->stype
);
531 ret
= LTTNG_ERR_INVALID
;
535 *relayd_sock
= rsock
;
540 /* The returned value is not useful since we are on an error path. */
541 (void) relayd_close(rsock
);
549 * Connect to the relayd using URI and send the socket to the right consumer.
551 static int send_consumer_relayd_socket(int domain
, unsigned int session_id
,
552 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
553 struct consumer_socket
*consumer_sock
)
556 struct lttcomm_relayd_sock
*rsock
= NULL
;
558 /* Connect to relayd and make version check if uri is the control. */
559 ret
= create_connect_relayd(relayd_uri
, &rsock
);
560 if (ret
!= LTTNG_OK
) {
565 /* Set the network sequence index if not set. */
566 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
567 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
569 * Increment net_seq_idx because we are about to transfer the
570 * new relayd socket to the consumer.
571 * Assign unique key so the consumer can match streams.
573 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
574 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
577 /* Send relayd socket to consumer. */
578 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
579 relayd_uri
->stype
, session_id
);
581 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
585 /* Flag that the corresponding socket was sent. */
586 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
587 consumer_sock
->control_sock_sent
= 1;
588 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
589 consumer_sock
->data_sock_sent
= 1;
595 * Close socket which was dup on the consumer side. The session daemon does
596 * NOT keep track of the relayd socket(s) once transfer to the consumer.
600 (void) relayd_close(rsock
);
604 if (ret
!= LTTNG_OK
) {
606 * The consumer output for this session should not be used anymore
607 * since the relayd connection failed thus making any tracing or/and
608 * streaming not usable.
610 consumer
->enabled
= 0;
616 * Send both relayd sockets to a specific consumer and domain. This is a
617 * helper function to facilitate sending the information to the consumer for a
620 static int send_consumer_relayd_sockets(int domain
, unsigned int session_id
,
621 struct consumer_output
*consumer
, struct consumer_socket
*sock
)
628 /* Sending control relayd socket. */
629 if (!sock
->control_sock_sent
) {
630 ret
= send_consumer_relayd_socket(domain
, session_id
,
631 &consumer
->dst
.net
.control
, consumer
, sock
);
632 if (ret
!= LTTNG_OK
) {
637 /* Sending data relayd socket. */
638 if (!sock
->data_sock_sent
) {
639 ret
= send_consumer_relayd_socket(domain
, session_id
,
640 &consumer
->dst
.net
.data
, consumer
, sock
);
641 if (ret
!= LTTNG_OK
) {
651 * Setup relayd connections for a tracing session. First creates the socket to
652 * the relayd and send them to the right domain consumer. Consumer type MUST be
655 int cmd_setup_relayd(struct ltt_session
*session
)
658 struct ltt_ust_session
*usess
;
659 struct ltt_kernel_session
*ksess
;
660 struct consumer_socket
*socket
;
661 struct lttng_ht_iter iter
;
665 usess
= session
->ust_session
;
666 ksess
= session
->kernel_session
;
668 DBG("Setting relayd for session %s", session
->name
);
672 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
673 && usess
->consumer
->enabled
) {
674 /* For each consumer socket, send relayd sockets */
675 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
677 /* Code flow error */
678 assert(socket
->fd
>= 0);
680 pthread_mutex_lock(socket
->lock
);
681 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
->id
,
682 usess
->consumer
, socket
);
683 pthread_mutex_unlock(socket
->lock
);
684 if (ret
!= LTTNG_OK
) {
687 /* Session is now ready for network streaming. */
688 session
->net_handle
= 1;
692 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
693 && ksess
->consumer
->enabled
) {
694 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
696 /* Code flow error */
697 assert(socket
->fd
>= 0);
699 pthread_mutex_lock(socket
->lock
);
700 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
->id
,
701 ksess
->consumer
, socket
);
702 pthread_mutex_unlock(socket
->lock
);
703 if (ret
!= LTTNG_OK
) {
706 /* Session is now ready for network streaming. */
707 session
->net_handle
= 1;
717 * Start a kernel session by opening all necessary streams.
719 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
722 struct ltt_kernel_channel
*kchan
;
724 /* Open kernel metadata */
725 if (ksess
->metadata
== NULL
&& ksess
->output_traces
) {
726 ret
= kernel_open_metadata(ksess
);
728 ret
= LTTNG_ERR_KERN_META_FAIL
;
733 /* Open kernel metadata stream */
734 if (ksess
->metadata
&& ksess
->metadata_stream_fd
< 0) {
735 ret
= kernel_open_metadata_stream(ksess
);
737 ERR("Kernel create metadata stream failed");
738 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
743 /* For each channel */
744 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
745 if (kchan
->stream_count
== 0) {
746 ret
= kernel_open_channel_stream(kchan
);
748 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
751 /* Update the stream global counter */
752 ksess
->stream_count_global
+= ret
;
756 /* Setup kernel consumer socket and send fds to it */
757 ret
= init_kernel_tracing(ksess
);
759 ret
= LTTNG_ERR_KERN_START_FAIL
;
763 /* This start the kernel tracing */
764 ret
= kernel_start_session(ksess
);
766 ret
= LTTNG_ERR_KERN_START_FAIL
;
770 /* Quiescent wait after starting trace */
771 kernel_wait_quiescent(kernel_tracer_fd
);
782 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
784 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
788 struct ltt_ust_session
*usess
;
790 usess
= session
->ust_session
;
795 case LTTNG_DOMAIN_KERNEL
:
797 ret
= channel_kernel_disable(session
->kernel_session
,
799 if (ret
!= LTTNG_OK
) {
803 kernel_wait_quiescent(kernel_tracer_fd
);
806 case LTTNG_DOMAIN_UST
:
808 struct ltt_ust_channel
*uchan
;
809 struct lttng_ht
*chan_ht
;
811 chan_ht
= usess
->domain_global
.channels
;
813 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
815 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
819 ret
= channel_ust_disable(usess
, uchan
);
820 if (ret
!= LTTNG_OK
) {
826 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
827 case LTTNG_DOMAIN_UST_EXEC_NAME
:
828 case LTTNG_DOMAIN_UST_PID
:
831 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
843 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
845 * The wpipe arguments is used as a notifier for the kernel thread.
847 int cmd_enable_channel(struct ltt_session
*session
,
848 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
851 struct ltt_ust_session
*usess
= session
->ust_session
;
852 struct lttng_ht
*chan_ht
;
858 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
862 switch (domain
->type
) {
863 case LTTNG_DOMAIN_KERNEL
:
865 struct ltt_kernel_channel
*kchan
;
867 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
868 session
->kernel_session
);
871 * Don't try to create a channel if the session
872 * has been started at some point in time
873 * before. The tracer does not allow it.
875 if (session
->started
) {
876 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
879 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
880 if (attr
->name
[0] != '\0') {
881 session
->kernel_session
->has_non_default_channel
= 1;
884 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
887 if (ret
!= LTTNG_OK
) {
891 kernel_wait_quiescent(kernel_tracer_fd
);
894 case LTTNG_DOMAIN_UST
:
896 struct ltt_ust_channel
*uchan
;
898 chan_ht
= usess
->domain_global
.channels
;
900 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
903 * Don't try to create a channel if the session
904 * has been started at some point in time
905 * before. The tracer does not allow it.
907 if (session
->started
) {
908 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
911 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
912 if (attr
->name
[0] != '\0') {
913 usess
->has_non_default_channel
= 1;
916 ret
= channel_ust_enable(usess
, uchan
);
921 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
932 * Command LTTNG_DISABLE_EVENT processed by the client thread.
934 int cmd_disable_event(struct ltt_session
*session
, int domain
,
935 char *channel_name
, char *event_name
)
942 case LTTNG_DOMAIN_KERNEL
:
944 struct ltt_kernel_channel
*kchan
;
945 struct ltt_kernel_session
*ksess
;
947 ksess
= session
->kernel_session
;
950 * If a non-default channel has been created in the
951 * session, explicitely require that -c chan_name needs
954 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
955 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
959 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
961 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
965 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
966 if (ret
!= LTTNG_OK
) {
970 kernel_wait_quiescent(kernel_tracer_fd
);
973 case LTTNG_DOMAIN_UST
:
975 struct ltt_ust_channel
*uchan
;
976 struct ltt_ust_session
*usess
;
978 usess
= session
->ust_session
;
981 * If a non-default channel has been created in the
982 * session, explicitely require that -c chan_name needs
985 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
986 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
990 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
993 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
997 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
998 if (ret
!= LTTNG_OK
) {
1002 DBG3("Disable UST event %s in channel %s completed", event_name
,
1007 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1008 case LTTNG_DOMAIN_UST_PID
:
1009 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1012 ret
= LTTNG_ERR_UND
;
1024 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1026 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
1034 case LTTNG_DOMAIN_KERNEL
:
1036 struct ltt_kernel_session
*ksess
;
1037 struct ltt_kernel_channel
*kchan
;
1039 ksess
= session
->kernel_session
;
1042 * If a non-default channel has been created in the
1043 * session, explicitely require that -c chan_name needs
1046 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1047 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1051 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1052 if (kchan
== NULL
) {
1053 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1057 ret
= event_kernel_disable_all(kchan
);
1058 if (ret
!= LTTNG_OK
) {
1062 kernel_wait_quiescent(kernel_tracer_fd
);
1065 case LTTNG_DOMAIN_UST
:
1067 struct ltt_ust_session
*usess
;
1068 struct ltt_ust_channel
*uchan
;
1070 usess
= session
->ust_session
;
1073 * If a non-default channel has been created in the
1074 * session, explicitely require that -c chan_name needs
1077 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1078 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1082 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1084 if (uchan
== NULL
) {
1085 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1089 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1094 DBG3("Disable all UST events in channel %s completed", channel_name
);
1099 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1100 case LTTNG_DOMAIN_UST_PID
:
1101 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1104 ret
= LTTNG_ERR_UND
;
1116 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1118 int cmd_add_context(struct ltt_session
*session
, int domain
,
1119 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1121 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1124 case LTTNG_DOMAIN_KERNEL
:
1125 assert(session
->kernel_session
);
1128 * If a non-default channel has been created in the
1129 * session, explicitely require that -c chan_name needs
1132 if (session
->kernel_session
->has_non_default_channel
1133 && channel_name
[0] == '\0') {
1134 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1138 if (session
->kernel_session
->channel_count
== 0) {
1139 /* Create default channel */
1140 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1141 if (ret
!= LTTNG_OK
) {
1144 chan_kern_created
= 1;
1146 /* Add kernel context to kernel tracer */
1147 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1148 if (ret
!= LTTNG_OK
) {
1152 case LTTNG_DOMAIN_UST
:
1154 struct ltt_ust_session
*usess
= session
->ust_session
;
1155 unsigned int chan_count
;
1160 * If a non-default channel has been created in the
1161 * session, explicitely require that -c chan_name needs
1164 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1165 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1169 chan_count
= lttng_ht_get_count(usess
->domain_global
.channels
);
1170 if (chan_count
== 0) {
1171 struct lttng_channel
*attr
;
1172 /* Create default channel */
1173 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1175 ret
= LTTNG_ERR_FATAL
;
1179 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1180 if (ret
!= LTTNG_OK
) {
1185 chan_ust_created
= 1;
1188 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1189 if (ret
!= LTTNG_OK
) {
1195 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1196 case LTTNG_DOMAIN_UST_PID
:
1197 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1200 ret
= LTTNG_ERR_UND
;
1207 if (chan_kern_created
) {
1208 struct ltt_kernel_channel
*kchan
=
1209 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1210 session
->kernel_session
);
1211 /* Created previously, this should NOT fail. */
1213 kernel_destroy_channel(kchan
);
1216 if (chan_ust_created
) {
1217 struct ltt_ust_channel
*uchan
=
1218 trace_ust_find_channel_by_name(
1219 session
->ust_session
->domain_global
.channels
,
1220 DEFAULT_CHANNEL_NAME
);
1221 /* Created previously, this should NOT fail. */
1223 /* Remove from the channel list of the session. */
1224 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1226 trace_ust_destroy_channel(uchan
);
1232 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1234 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1235 char *channel_name
, struct lttng_event
*event
,
1236 struct lttng_filter_bytecode
*filter
, int wpipe
)
1238 int ret
, channel_created
= 0;
1239 struct lttng_channel
*attr
;
1243 assert(channel_name
);
1247 switch (domain
->type
) {
1248 case LTTNG_DOMAIN_KERNEL
:
1250 struct ltt_kernel_channel
*kchan
;
1253 * If a non-default channel has been created in the
1254 * session, explicitely require that -c chan_name needs
1257 if (session
->kernel_session
->has_non_default_channel
1258 && channel_name
[0] == '\0') {
1259 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1263 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1264 session
->kernel_session
);
1265 if (kchan
== NULL
) {
1266 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1267 LTTNG_BUFFER_GLOBAL
);
1269 ret
= LTTNG_ERR_FATAL
;
1272 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1274 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1275 if (ret
!= LTTNG_OK
) {
1281 channel_created
= 1;
1284 /* Get the newly created kernel channel pointer */
1285 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1286 session
->kernel_session
);
1287 if (kchan
== NULL
) {
1288 /* This sould not happen... */
1289 ret
= LTTNG_ERR_FATAL
;
1293 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1294 if (ret
!= LTTNG_OK
) {
1295 if (channel_created
) {
1296 /* Let's not leak a useless channel. */
1297 kernel_destroy_channel(kchan
);
1302 kernel_wait_quiescent(kernel_tracer_fd
);
1305 case LTTNG_DOMAIN_UST
:
1307 struct ltt_ust_channel
*uchan
;
1308 struct ltt_ust_session
*usess
= session
->ust_session
;
1313 * If a non-default channel has been created in the
1314 * session, explicitely require that -c chan_name needs
1317 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1318 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1322 /* Get channel from global UST domain */
1323 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1325 if (uchan
== NULL
) {
1326 /* Create default channel */
1327 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1328 usess
->buffer_type
);
1330 ret
= LTTNG_ERR_FATAL
;
1333 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1335 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1336 if (ret
!= LTTNG_OK
) {
1342 /* Get the newly created channel reference back */
1343 uchan
= trace_ust_find_channel_by_name(
1344 usess
->domain_global
.channels
, channel_name
);
1348 /* At this point, the session and channel exist on the tracer */
1349 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
, filter
);
1350 if (ret
!= LTTNG_OK
) {
1356 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1357 case LTTNG_DOMAIN_UST_PID
:
1358 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1361 ret
= LTTNG_ERR_UND
;
1373 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1375 int cmd_enable_event_all(struct ltt_session
*session
,
1376 struct lttng_domain
*domain
, char *channel_name
, int event_type
,
1377 struct lttng_filter_bytecode
*filter
, int wpipe
)
1380 struct lttng_channel
*attr
;
1383 assert(channel_name
);
1387 switch (domain
->type
) {
1388 case LTTNG_DOMAIN_KERNEL
:
1390 struct ltt_kernel_channel
*kchan
;
1392 assert(session
->kernel_session
);
1395 * If a non-default channel has been created in the
1396 * session, explicitely require that -c chan_name needs
1399 if (session
->kernel_session
->has_non_default_channel
1400 && channel_name
[0] == '\0') {
1401 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1405 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1406 session
->kernel_session
);
1407 if (kchan
== NULL
) {
1408 /* Create default channel */
1409 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1410 LTTNG_BUFFER_GLOBAL
);
1412 ret
= LTTNG_ERR_FATAL
;
1415 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1417 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1418 if (ret
!= LTTNG_OK
) {
1424 /* Get the newly created kernel channel pointer */
1425 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1426 session
->kernel_session
);
1430 switch (event_type
) {
1431 case LTTNG_EVENT_SYSCALL
:
1432 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1434 case LTTNG_EVENT_TRACEPOINT
:
1436 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1437 * events already registered to the channel.
1439 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1441 case LTTNG_EVENT_ALL
:
1442 /* Enable syscalls and tracepoints */
1443 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1446 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1450 /* Manage return value */
1451 if (ret
!= LTTNG_OK
) {
1453 * On error, cmd_enable_channel call will take care of destroying
1454 * the created channel if it was needed.
1459 kernel_wait_quiescent(kernel_tracer_fd
);
1462 case LTTNG_DOMAIN_UST
:
1464 struct ltt_ust_channel
*uchan
;
1465 struct ltt_ust_session
*usess
= session
->ust_session
;
1470 * If a non-default channel has been created in the
1471 * session, explicitely require that -c chan_name needs
1474 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1475 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1479 /* Get channel from global UST domain */
1480 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1482 if (uchan
== NULL
) {
1483 /* Create default channel */
1484 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1485 usess
->buffer_type
);
1487 ret
= LTTNG_ERR_FATAL
;
1490 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1492 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1493 if (ret
!= LTTNG_OK
) {
1499 /* Get the newly created channel reference back */
1500 uchan
= trace_ust_find_channel_by_name(
1501 usess
->domain_global
.channels
, channel_name
);
1505 /* At this point, the session and channel exist on the tracer */
1507 switch (event_type
) {
1508 case LTTNG_EVENT_ALL
:
1509 case LTTNG_EVENT_TRACEPOINT
:
1510 ret
= event_ust_enable_all_tracepoints(usess
, uchan
, filter
);
1511 if (ret
!= LTTNG_OK
) {
1516 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1520 /* Manage return value */
1521 if (ret
!= LTTNG_OK
) {
1528 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1529 case LTTNG_DOMAIN_UST_PID
:
1530 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1533 ret
= LTTNG_ERR_UND
;
1546 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1548 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1551 ssize_t nb_events
= 0;
1554 case LTTNG_DOMAIN_KERNEL
:
1555 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1556 if (nb_events
< 0) {
1557 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1561 case LTTNG_DOMAIN_UST
:
1562 nb_events
= ust_app_list_events(events
);
1563 if (nb_events
< 0) {
1564 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1569 ret
= LTTNG_ERR_UND
;
1576 /* Return negative value to differentiate return code */
1581 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1583 ssize_t
cmd_list_tracepoint_fields(int domain
,
1584 struct lttng_event_field
**fields
)
1587 ssize_t nb_fields
= 0;
1590 case LTTNG_DOMAIN_UST
:
1591 nb_fields
= ust_app_list_event_fields(fields
);
1592 if (nb_fields
< 0) {
1593 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1597 case LTTNG_DOMAIN_KERNEL
:
1598 default: /* fall-through */
1599 ret
= LTTNG_ERR_UND
;
1606 /* Return negative value to differentiate return code */
1611 * Command LTTNG_START_TRACE processed by the client thread.
1613 int cmd_start_trace(struct ltt_session
*session
)
1616 struct ltt_kernel_session
*ksession
;
1617 struct ltt_ust_session
*usess
;
1621 /* Ease our life a bit ;) */
1622 ksession
= session
->kernel_session
;
1623 usess
= session
->ust_session
;
1625 if (session
->enabled
) {
1626 /* Already started. */
1627 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1631 session
->enabled
= 1;
1633 /* Kernel tracing */
1634 if (ksession
!= NULL
) {
1635 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1636 if (ret
!= LTTNG_OK
) {
1641 /* Flag session that trace should start automatically */
1643 usess
->start_trace
= 1;
1645 ret
= ust_app_start_trace_all(usess
);
1647 ret
= LTTNG_ERR_UST_START_FAIL
;
1652 session
->started
= 1;
1661 * Command LTTNG_STOP_TRACE processed by the client thread.
1663 int cmd_stop_trace(struct ltt_session
*session
)
1666 struct ltt_kernel_channel
*kchan
;
1667 struct ltt_kernel_session
*ksession
;
1668 struct ltt_ust_session
*usess
;
1673 ksession
= session
->kernel_session
;
1674 usess
= session
->ust_session
;
1676 if (!session
->enabled
) {
1677 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1681 session
->enabled
= 0;
1684 if (ksession
&& ksession
->started
) {
1685 DBG("Stop kernel tracing");
1687 /* Flush metadata if exist */
1688 if (ksession
->metadata_stream_fd
>= 0) {
1689 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1691 ERR("Kernel metadata flush failed");
1695 /* Flush all buffers before stopping */
1696 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1697 ret
= kernel_flush_buffer(kchan
);
1699 ERR("Kernel flush buffer error");
1703 ret
= kernel_stop_session(ksession
);
1705 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1709 kernel_wait_quiescent(kernel_tracer_fd
);
1711 ksession
->started
= 0;
1714 if (usess
&& usess
->start_trace
) {
1715 usess
->start_trace
= 0;
1717 ret
= ust_app_stop_trace_all(usess
);
1719 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1731 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1733 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1734 size_t nb_uri
, struct lttng_uri
*uris
)
1737 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1738 struct ltt_ust_session
*usess
= session
->ust_session
;
1739 struct consumer_output
*consumer
= NULL
;
1745 /* Can't enable consumer after session started. */
1746 if (session
->enabled
) {
1747 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1752 * This case switch makes sure the domain session has a temporary consumer
1753 * so the URL can be set.
1757 /* Code flow error. A session MUST always have a consumer object */
1758 assert(session
->consumer
);
1760 * The URL will be added to the tracing session consumer instead of a
1761 * specific domain consumer.
1763 consumer
= session
->consumer
;
1765 case LTTNG_DOMAIN_KERNEL
:
1766 /* Code flow error if we don't have a kernel session here. */
1768 assert(ksess
->consumer
);
1769 consumer
= ksess
->consumer
;
1771 case LTTNG_DOMAIN_UST
:
1772 /* Code flow error if we don't have a kernel session here. */
1774 assert(usess
->consumer
);
1775 consumer
= usess
->consumer
;
1779 for (i
= 0; i
< nb_uri
; i
++) {
1780 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1781 if (ret
!= LTTNG_OK
) {
1794 * Command LTTNG_CREATE_SESSION processed by the client thread.
1796 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1797 size_t nb_uri
, lttng_sock_cred
*creds
)
1800 struct ltt_session
*session
;
1806 * Verify if the session already exist
1808 * XXX: There is no need for the session lock list here since the caller
1809 * (process_client_msg) is holding it. We might want to change that so a
1810 * single command does not lock the entire session list.
1812 session
= session_find_by_name(name
);
1813 if (session
!= NULL
) {
1814 ret
= LTTNG_ERR_EXIST_SESS
;
1818 /* Create tracing session in the registry */
1819 ret
= session_create(name
, LTTNG_SOCK_GET_UID_CRED(creds
),
1820 LTTNG_SOCK_GET_GID_CRED(creds
));
1821 if (ret
!= LTTNG_OK
) {
1826 * Get the newly created session pointer back
1828 * XXX: There is no need for the session lock list here since the caller
1829 * (process_client_msg) is holding it. We might want to change that so a
1830 * single command does not lock the entire session list.
1832 session
= session_find_by_name(name
);
1835 /* Create default consumer output for the session not yet created. */
1836 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1837 if (session
->consumer
== NULL
) {
1838 ret
= LTTNG_ERR_FATAL
;
1839 goto consumer_error
;
1843 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1844 if (ret
!= LTTNG_OK
) {
1845 goto consumer_error
;
1847 session
->output_traces
= 1;
1849 session
->output_traces
= 0;
1850 DBG2("Session %s created with no output", session
->name
);
1853 session
->consumer
->enabled
= 1;
1858 session_destroy(session
);
1865 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
1867 int cmd_create_session_snapshot(char *name
, struct lttng_uri
*uris
,
1868 size_t nb_uri
, lttng_sock_cred
*creds
)
1871 struct ltt_session
*session
;
1872 struct snapshot_output
*new_output
= NULL
;
1878 * Create session in no output mode with URIs set to NULL. The uris we've
1879 * received are for a default snapshot output if one.
1881 ret
= cmd_create_session_uri(name
, NULL
, 0, creds
);
1882 if (ret
!= LTTNG_OK
) {
1886 /* Get the newly created session pointer back. This should NEVER fail. */
1887 session
= session_find_by_name(name
);
1890 /* Flag session for snapshot mode. */
1891 session
->snapshot_mode
= 1;
1893 /* Skip snapshot output creation if no URI is given. */
1898 new_output
= snapshot_output_alloc();
1900 ret
= LTTNG_ERR_NOMEM
;
1901 goto error_snapshot_alloc
;
1904 ret
= snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE
, NULL
,
1905 uris
, nb_uri
, session
->consumer
, new_output
, &session
->snapshot
);
1907 if (ret
== -ENOMEM
) {
1908 ret
= LTTNG_ERR_NOMEM
;
1910 ret
= LTTNG_ERR_INVALID
;
1912 goto error_snapshot
;
1916 snapshot_add_output(&session
->snapshot
, new_output
);
1923 snapshot_output_destroy(new_output
);
1924 error_snapshot_alloc
:
1925 session_destroy(session
);
1931 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1933 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1936 struct ltt_ust_session
*usess
;
1937 struct ltt_kernel_session
*ksess
;
1942 usess
= session
->ust_session
;
1943 ksess
= session
->kernel_session
;
1945 /* Clean kernel session teardown */
1946 kernel_destroy_session(ksess
);
1948 /* UST session teardown */
1950 /* Close any relayd session */
1951 consumer_output_send_destroy_relayd(usess
->consumer
);
1953 /* Destroy every UST application related to this session. */
1954 ret
= ust_app_destroy_trace_all(usess
);
1956 ERR("Error in ust_app_destroy_trace_all");
1959 /* Clean up the rest. */
1960 trace_ust_destroy_session(usess
);
1964 * Must notify the kernel thread here to update it's poll set in order to
1965 * remove the channel(s)' fd just destroyed.
1967 ret
= notify_thread_pipe(wpipe
);
1969 PERROR("write kernel poll pipe");
1972 ret
= session_destroy(session
);
1978 * Command LTTNG_CALIBRATE processed by the client thread.
1980 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1985 case LTTNG_DOMAIN_KERNEL
:
1987 struct lttng_kernel_calibrate kcalibrate
;
1989 kcalibrate
.type
= calibrate
->type
;
1990 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1992 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1997 case LTTNG_DOMAIN_UST
:
1999 struct lttng_ust_calibrate ucalibrate
;
2001 ucalibrate
.type
= calibrate
->type
;
2002 ret
= ust_app_calibrate_glb(&ucalibrate
);
2004 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
2010 ret
= LTTNG_ERR_UND
;
2021 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2023 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2024 const char *sock_path
, struct consumer_data
*cdata
)
2027 struct consumer_socket
*socket
= NULL
;
2034 case LTTNG_DOMAIN_KERNEL
:
2036 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2040 /* Can't register a consumer if there is already one */
2041 if (ksess
->consumer_fds_sent
!= 0) {
2042 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2046 sock
= lttcomm_connect_unix_sock(sock_path
);
2048 ret
= LTTNG_ERR_CONNECT_FAIL
;
2052 socket
= consumer_allocate_socket(sock
);
2053 if (socket
== NULL
) {
2056 PERROR("close register consumer");
2058 ret
= LTTNG_ERR_FATAL
;
2062 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
2063 if (socket
->lock
== NULL
) {
2064 PERROR("zmalloc pthread mutex");
2065 ret
= LTTNG_ERR_FATAL
;
2068 pthread_mutex_init(socket
->lock
, NULL
);
2069 socket
->registered
= 1;
2072 consumer_add_socket(socket
, ksess
->consumer
);
2075 pthread_mutex_lock(&cdata
->pid_mutex
);
2077 pthread_mutex_unlock(&cdata
->pid_mutex
);
2082 /* TODO: Userspace tracing */
2083 ret
= LTTNG_ERR_UND
;
2091 consumer_destroy_socket(socket
);
2097 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2099 ssize_t
cmd_list_domains(struct ltt_session
*session
,
2100 struct lttng_domain
**domains
)
2105 if (session
->kernel_session
!= NULL
) {
2106 DBG3("Listing domains found kernel domain");
2110 if (session
->ust_session
!= NULL
) {
2111 DBG3("Listing domains found UST global domain");
2115 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2116 if (*domains
== NULL
) {
2117 ret
= LTTNG_ERR_FATAL
;
2121 if (session
->kernel_session
!= NULL
) {
2122 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2126 if (session
->ust_session
!= NULL
) {
2127 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2128 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2135 /* Return negative value to differentiate return code */
2141 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2143 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
2144 struct lttng_channel
**channels
)
2147 ssize_t nb_chan
= 0;
2150 case LTTNG_DOMAIN_KERNEL
:
2151 if (session
->kernel_session
!= NULL
) {
2152 nb_chan
= session
->kernel_session
->channel_count
;
2154 DBG3("Number of kernel channels %zd", nb_chan
);
2156 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2159 case LTTNG_DOMAIN_UST
:
2160 if (session
->ust_session
!= NULL
) {
2161 nb_chan
= lttng_ht_get_count(
2162 session
->ust_session
->domain_global
.channels
);
2164 DBG3("Number of UST global channels %zd", nb_chan
);
2166 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2171 ret
= LTTNG_ERR_UND
;
2176 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2177 if (*channels
== NULL
) {
2178 ret
= LTTNG_ERR_FATAL
;
2182 list_lttng_channels(domain
, session
, *channels
);
2185 /* Ret value was set in the domain switch case */
2192 /* Return negative value to differentiate return code */
2197 * Command LTTNG_LIST_EVENTS processed by the client thread.
2199 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2200 char *channel_name
, struct lttng_event
**events
)
2203 ssize_t nb_event
= 0;
2206 case LTTNG_DOMAIN_KERNEL
:
2207 if (session
->kernel_session
!= NULL
) {
2208 nb_event
= list_lttng_kernel_events(channel_name
,
2209 session
->kernel_session
, events
);
2212 case LTTNG_DOMAIN_UST
:
2214 if (session
->ust_session
!= NULL
) {
2215 nb_event
= list_lttng_ust_global_events(channel_name
,
2216 &session
->ust_session
->domain_global
, events
);
2221 ret
= LTTNG_ERR_UND
;
2228 /* Return negative value to differentiate return code */
2233 * Using the session list, filled a lttng_session array to send back to the
2234 * client for session listing.
2236 * The session list lock MUST be acquired before calling this function. Use
2237 * session_lock_list() and session_unlock_list().
2239 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2244 struct ltt_session
*session
;
2245 struct ltt_session_list
*list
= session_get_list();
2247 DBG("Getting all available session for UID %d GID %d",
2250 * Iterate over session list and append data after the control struct in
2253 cds_list_for_each_entry(session
, &list
->head
, list
) {
2255 * Only list the sessions the user can control.
2257 if (!session_access_ok(session
, uid
, gid
)) {
2261 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2262 struct ltt_ust_session
*usess
= session
->ust_session
;
2264 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2265 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2266 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2267 ret
= build_network_session_path(sessions
[i
].path
,
2268 sizeof(sessions
[i
].path
), session
);
2270 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
2271 session
->consumer
->dst
.trace_path
);
2274 PERROR("snprintf session path");
2278 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2279 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2280 sessions
[i
].enabled
= session
->enabled
;
2281 sessions
[i
].snapshot_mode
= session
->snapshot_mode
;
2287 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2288 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2290 int cmd_data_pending(struct ltt_session
*session
)
2293 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2294 struct ltt_ust_session
*usess
= session
->ust_session
;
2298 /* Session MUST be stopped to ask for data availability. */
2299 if (session
->enabled
) {
2300 ret
= LTTNG_ERR_SESSION_STARTED
;
2304 if (ksess
&& ksess
->consumer
) {
2305 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2307 /* Data is still being extracted for the kernel. */
2312 if (usess
&& usess
->consumer
) {
2313 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2315 /* Data is still being extracted for the kernel. */
2320 /* Data is ready to be read by a viewer */
2328 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2330 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2332 int cmd_snapshot_add_output(struct ltt_session
*session
,
2333 struct lttng_snapshot_output
*output
, uint32_t *id
)
2336 struct snapshot_output
*new_output
;
2341 DBG("Cmd snapshot add output for session %s", session
->name
);
2344 * Permission denied to create an output if the session is not
2345 * set in no output mode.
2347 if (session
->output_traces
) {
2348 ret
= LTTNG_ERR_EPERM
;
2352 /* Only one output is allowed until we have the "tee" feature. */
2353 if (session
->snapshot
.nb_output
== 1) {
2354 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
2358 new_output
= snapshot_output_alloc();
2360 ret
= LTTNG_ERR_NOMEM
;
2364 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2365 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
2366 &session
->snapshot
);
2368 if (ret
== -ENOMEM
) {
2369 ret
= LTTNG_ERR_NOMEM
;
2371 ret
= LTTNG_ERR_INVALID
;
2377 snapshot_add_output(&session
->snapshot
, new_output
);
2379 *id
= new_output
->id
;
2386 snapshot_output_destroy(new_output
);
2392 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2394 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2396 int cmd_snapshot_del_output(struct ltt_session
*session
,
2397 struct lttng_snapshot_output
*output
)
2400 struct snapshot_output
*sout
= NULL
;
2408 * Permission denied to create an output if the session is not
2409 * set in no output mode.
2411 if (session
->output_traces
) {
2412 ret
= LTTNG_ERR_EPERM
;
2417 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
2419 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
2420 } else if (*output
->name
!= '\0') {
2421 DBG("Cmd snapshot del output name %s for session %s", output
->name
,
2423 sout
= snapshot_find_output_by_name(output
->name
, &session
->snapshot
);
2426 ret
= LTTNG_ERR_INVALID
;
2430 snapshot_delete_output(&session
->snapshot
, sout
);
2431 snapshot_output_destroy(sout
);
2440 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2442 * If no output is available, outputs is untouched and 0 is returned.
2444 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2446 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
2447 struct lttng_snapshot_output
**outputs
)
2450 struct lttng_snapshot_output
*list
;
2451 struct lttng_ht_iter iter
;
2452 struct snapshot_output
*output
;
2457 DBG("Cmd snapshot list outputs for session %s", session
->name
);
2460 * Permission denied to create an output if the session is not
2461 * set in no output mode.
2463 if (session
->output_traces
) {
2464 ret
= LTTNG_ERR_EPERM
;
2468 if (session
->snapshot
.nb_output
== 0) {
2473 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
2475 ret
= LTTNG_ERR_NOMEM
;
2479 /* Copy list from session to the new list object. */
2480 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
2481 output
, node
.node
) {
2482 assert(output
->consumer
);
2483 list
[idx
].id
= output
->id
;
2484 list
[idx
].max_size
= output
->max_size
;
2485 strncpy(list
[idx
].name
, output
->name
, sizeof(list
[idx
].name
));
2486 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
2487 strncpy(list
[idx
].ctrl_url
, output
->consumer
->dst
.trace_path
,
2488 sizeof(list
[idx
].ctrl_url
));
2491 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
2492 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
2494 ret
= LTTNG_ERR_NOMEM
;
2499 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
2500 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
2502 ret
= LTTNG_ERR_NOMEM
;
2510 return session
->snapshot
.nb_output
;
2519 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2520 * snapshot output is *not* set with a remote destination.
2522 * Return 0 on success or a LTTNG_ERR code.
2524 static int set_relayd_for_snapshot(struct consumer_output
*consumer
,
2525 struct snapshot_output
*snap_output
, struct ltt_session
*session
)
2528 struct lttng_ht_iter iter
;
2529 struct consumer_socket
*socket
;
2532 assert(snap_output
);
2535 DBG2("Set relayd object from snapshot output");
2537 /* Ignore if snapshot consumer output is not network. */
2538 if (snap_output
->consumer
->type
!= CONSUMER_DST_NET
) {
2543 * For each consumer socket, create and send the relayd object of the
2547 cds_lfht_for_each_entry(snap_output
->consumer
->socks
->ht
, &iter
.iter
,
2548 socket
, node
.node
) {
2549 ret
= send_consumer_relayd_sockets(0, session
->id
,
2550 snap_output
->consumer
, socket
);
2551 if (ret
!= LTTNG_OK
) {
2563 * Record a kernel snapshot.
2565 * Return 0 on success or a LTTNG_ERR code.
2567 static int record_kernel_snapshot(struct ltt_kernel_session
*ksess
,
2568 struct snapshot_output
*output
, struct ltt_session
*session
,
2569 int wait
, int nb_streams
)
2577 /* Get the datetime for the snapshot output directory. */
2578 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
2579 sizeof(output
->datetime
));
2581 ret
= LTTNG_ERR_INVALID
;
2586 * Copy kernel session sockets so we can communicate with the right
2587 * consumer for the snapshot record command.
2589 ret
= consumer_copy_sockets(output
->consumer
, ksess
->consumer
);
2591 ret
= LTTNG_ERR_NOMEM
;
2595 ret
= set_relayd_for_snapshot(ksess
->consumer
, output
, session
);
2596 if (ret
!= LTTNG_OK
) {
2597 goto error_snapshot
;
2600 ret
= kernel_snapshot_record(ksess
, output
, wait
, nb_streams
);
2602 if (ret
== -EINVAL
) {
2603 ret
= LTTNG_ERR_INVALID
;
2604 goto error_snapshot
;
2607 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
2608 goto error_snapshot
;
2614 /* Clean up copied sockets so this output can use some other later on. */
2615 consumer_destroy_output_sockets(output
->consumer
);
2621 * Record a UST snapshot.
2623 * Return 0 on success or a LTTNG_ERR error code.
2625 static int record_ust_snapshot(struct ltt_ust_session
*usess
,
2626 struct snapshot_output
*output
, struct ltt_session
*session
,
2627 int wait
, int nb_streams
)
2635 /* Get the datetime for the snapshot output directory. */
2636 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
2637 sizeof(output
->datetime
));
2639 ret
= LTTNG_ERR_INVALID
;
2644 * Copy UST session sockets so we can communicate with the right
2645 * consumer for the snapshot record command.
2647 ret
= consumer_copy_sockets(output
->consumer
, usess
->consumer
);
2649 ret
= LTTNG_ERR_NOMEM
;
2653 ret
= set_relayd_for_snapshot(usess
->consumer
, output
, session
);
2654 if (ret
!= LTTNG_OK
) {
2655 goto error_snapshot
;
2658 ret
= ust_app_snapshot_record(usess
, output
, wait
, nb_streams
);
2660 if (ret
== -EINVAL
) {
2661 ret
= LTTNG_ERR_INVALID
;
2662 goto error_snapshot
;
2665 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
2666 goto error_snapshot
;
2672 /* Clean up copied sockets so this output can use some other later on. */
2673 consumer_destroy_output_sockets(output
->consumer
);
2679 * Returns the total number of streams for a session or a negative value
2682 static unsigned int get_total_nb_stream(struct ltt_session
*session
)
2684 unsigned int total_streams
= 0;
2686 if (session
->kernel_session
) {
2687 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2689 total_streams
+= ksess
->stream_count_global
;
2692 if (session
->ust_session
) {
2693 struct ltt_ust_session
*usess
= session
->ust_session
;
2695 total_streams
+= ust_app_get_nb_stream(usess
);
2698 return total_streams
;
2702 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2704 * The wait parameter is ignored so this call always wait for the snapshot to
2705 * complete before returning.
2707 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2709 int cmd_snapshot_record(struct ltt_session
*session
,
2710 struct lttng_snapshot_output
*output
, int wait
)
2713 unsigned int use_tmp_output
= 0;
2714 struct snapshot_output tmp_output
;
2715 unsigned int nb_streams
, snapshot_success
= 0;
2719 DBG("Cmd snapshot record for session %s", session
->name
);
2722 * Permission denied to create an output if the session is not
2723 * set in no output mode.
2725 if (session
->output_traces
) {
2726 ret
= LTTNG_ERR_EPERM
;
2730 /* The session needs to be started at least once. */
2731 if (!session
->started
) {
2732 ret
= LTTNG_ERR_START_SESSION_ONCE
;
2736 /* Use temporary output for the session. */
2737 if (output
&& *output
->ctrl_url
!= '\0') {
2738 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2739 output
->ctrl_url
, output
->data_url
, session
->consumer
,
2742 if (ret
== -ENOMEM
) {
2743 ret
= LTTNG_ERR_NOMEM
;
2745 ret
= LTTNG_ERR_INVALID
;
2749 /* Use the global session count for the temporary snapshot. */
2750 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
2755 * Get the total number of stream of that session which is used by the
2756 * maximum size of the snapshot feature.
2758 nb_streams
= get_total_nb_stream(session
);
2760 if (session
->kernel_session
) {
2761 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2763 if (use_tmp_output
) {
2764 ret
= record_kernel_snapshot(ksess
, &tmp_output
, session
,
2766 if (ret
!= LTTNG_OK
) {
2769 snapshot_success
= 1;
2771 struct snapshot_output
*sout
;
2772 struct lttng_ht_iter iter
;
2775 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
2776 &iter
.iter
, sout
, node
.node
) {
2778 * Make a local copy of the output and assign the possible
2779 * temporary value given by the caller.
2781 memset(&tmp_output
, 0, sizeof(tmp_output
));
2782 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
2784 /* Use temporary max size. */
2785 if (output
->max_size
!= (uint64_t) -1ULL) {
2786 tmp_output
.max_size
= output
->max_size
;
2789 /* Use temporary name. */
2790 if (*output
->name
!= '\0') {
2791 strncpy(tmp_output
.name
, output
->name
,
2792 sizeof(tmp_output
.name
));
2795 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
2797 ret
= record_kernel_snapshot(ksess
, &tmp_output
,
2798 session
, wait
, nb_streams
);
2799 if (ret
!= LTTNG_OK
) {
2803 snapshot_success
= 1;
2809 if (session
->ust_session
) {
2810 struct ltt_ust_session
*usess
= session
->ust_session
;
2812 if (use_tmp_output
) {
2813 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
2815 if (ret
!= LTTNG_OK
) {
2818 snapshot_success
= 1;
2820 struct snapshot_output
*sout
;
2821 struct lttng_ht_iter iter
;
2824 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
2825 &iter
.iter
, sout
, node
.node
) {
2827 * Make a local copy of the output and assign the possible
2828 * temporary value given by the caller.
2830 memset(&tmp_output
, 0, sizeof(tmp_output
));
2831 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
2833 /* Use temporary max size. */
2834 if (output
->max_size
!= (uint64_t) -1ULL) {
2835 tmp_output
.max_size
= output
->max_size
;
2838 /* Use temporary name. */
2839 if (*output
->name
!= '\0') {
2840 strncpy(tmp_output
.name
, output
->name
,
2841 sizeof(tmp_output
.name
));
2844 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
2846 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
2848 if (ret
!= LTTNG_OK
) {
2852 snapshot_success
= 1;
2858 if (snapshot_success
) {
2859 session
->snapshot
.nb_snapshot
++;
2867 * Init command subsystem.
2872 * Set network sequence index to 1 for streams to match a relayd
2873 * socket on the consumer side.
2875 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
2876 relayd_net_seq_idx
= 1;
2877 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
2879 DBG("Command subsystem initialized");