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
,
551 char *session_name
, char *hostname
, int session_live_timer
)
554 struct lttcomm_relayd_sock
*rsock
= NULL
;
556 /* Connect to relayd and make version check if uri is the control. */
557 ret
= create_connect_relayd(relayd_uri
, &rsock
);
558 if (ret
!= LTTNG_OK
) {
563 /* Set the network sequence index if not set. */
564 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
565 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
567 * Increment net_seq_idx because we are about to transfer the
568 * new relayd socket to the consumer.
569 * Assign unique key so the consumer can match streams.
571 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
572 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
575 /* Send relayd socket to consumer. */
576 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
577 relayd_uri
->stype
, session_id
,
578 session_name
, hostname
, session_live_timer
);
580 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
584 /* Flag that the corresponding socket was sent. */
585 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
586 consumer_sock
->control_sock_sent
= 1;
587 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
588 consumer_sock
->data_sock_sent
= 1;
594 * Close socket which was dup on the consumer side. The session daemon does
595 * NOT keep track of the relayd socket(s) once transfer to the consumer.
599 (void) relayd_close(rsock
);
603 if (ret
!= LTTNG_OK
) {
605 * The consumer output for this session should not be used anymore
606 * since the relayd connection failed thus making any tracing or/and
607 * streaming not usable.
609 consumer
->enabled
= 0;
615 * Send both relayd sockets to a specific consumer and domain. This is a
616 * helper function to facilitate sending the information to the consumer for a
619 static int send_consumer_relayd_sockets(int domain
, unsigned int session_id
,
620 struct consumer_output
*consumer
, struct consumer_socket
*sock
,
621 char *session_name
, char *hostname
, int session_live_timer
)
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 session_name
, hostname
, session_live_timer
);
633 if (ret
!= LTTNG_OK
) {
638 /* Sending data relayd socket. */
639 if (!sock
->data_sock_sent
) {
640 ret
= send_consumer_relayd_socket(domain
, session_id
,
641 &consumer
->dst
.net
.data
, consumer
, sock
,
642 session_name
, hostname
, session_live_timer
);
643 if (ret
!= LTTNG_OK
) {
653 * Setup relayd connections for a tracing session. First creates the socket to
654 * the relayd and send them to the right domain consumer. Consumer type MUST be
657 int cmd_setup_relayd(struct ltt_session
*session
)
660 struct ltt_ust_session
*usess
;
661 struct ltt_kernel_session
*ksess
;
662 struct consumer_socket
*socket
;
663 struct lttng_ht_iter iter
;
667 usess
= session
->ust_session
;
668 ksess
= session
->kernel_session
;
670 DBG("Setting relayd for session %s", session
->name
);
674 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
675 && usess
->consumer
->enabled
) {
676 /* For each consumer socket, send relayd sockets */
677 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
679 pthread_mutex_lock(socket
->lock
);
680 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
->id
,
681 usess
->consumer
, socket
,
682 session
->name
, session
->hostname
,
683 session
->live_timer
);
684 pthread_mutex_unlock(socket
->lock
);
685 if (ret
!= LTTNG_OK
) {
688 /* Session is now ready for network streaming. */
689 session
->net_handle
= 1;
693 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
694 && ksess
->consumer
->enabled
) {
695 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
697 pthread_mutex_lock(socket
->lock
);
698 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
->id
,
699 ksess
->consumer
, socket
,
700 session
->name
, session
->hostname
,
701 session
->live_timer
);
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
);
863 * Don't try to enable a channel if the session has been started at
864 * some point in time before. The tracer does not allow it.
866 if (session
->started
) {
867 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
872 * If the session is a live session, remove the switch timer, the
873 * live timer does the same thing but sends also synchronisation
874 * beacons for inactive streams.
876 if (session
->live_timer
> 0) {
877 attr
->attr
.live_timer_interval
= session
->live_timer
;
878 attr
->attr
.switch_timer_interval
= 0;
881 switch (domain
->type
) {
882 case LTTNG_DOMAIN_KERNEL
:
884 struct ltt_kernel_channel
*kchan
;
886 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
887 session
->kernel_session
);
890 * Don't try to create a channel if the session
891 * has been started at some point in time
892 * before. The tracer does not allow it.
894 if (session
->started
) {
895 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
898 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
899 if (attr
->name
[0] != '\0') {
900 session
->kernel_session
->has_non_default_channel
= 1;
903 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
906 if (ret
!= LTTNG_OK
) {
910 kernel_wait_quiescent(kernel_tracer_fd
);
913 case LTTNG_DOMAIN_UST
:
915 struct ltt_ust_channel
*uchan
;
917 chan_ht
= usess
->domain_global
.channels
;
919 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
922 * Don't try to create a channel if the session
923 * has been started at some point in time
924 * before. The tracer does not allow it.
926 if (session
->started
) {
927 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
930 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
931 if (attr
->name
[0] != '\0') {
932 usess
->has_non_default_channel
= 1;
935 ret
= channel_ust_enable(usess
, uchan
);
940 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
951 * Command LTTNG_DISABLE_EVENT processed by the client thread.
953 int cmd_disable_event(struct ltt_session
*session
, int domain
,
954 char *channel_name
, char *event_name
)
961 case LTTNG_DOMAIN_KERNEL
:
963 struct ltt_kernel_channel
*kchan
;
964 struct ltt_kernel_session
*ksess
;
966 ksess
= session
->kernel_session
;
969 * If a non-default channel has been created in the
970 * session, explicitely require that -c chan_name needs
973 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
974 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
978 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
980 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
984 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
985 if (ret
!= LTTNG_OK
) {
989 kernel_wait_quiescent(kernel_tracer_fd
);
992 case LTTNG_DOMAIN_UST
:
994 struct ltt_ust_channel
*uchan
;
995 struct ltt_ust_session
*usess
;
997 usess
= session
->ust_session
;
1000 * If a non-default channel has been created in the
1001 * session, explicitely require that -c chan_name needs
1004 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1005 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1009 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1011 if (uchan
== NULL
) {
1012 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1016 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
1017 if (ret
!= LTTNG_OK
) {
1021 DBG3("Disable UST event %s in channel %s completed", event_name
,
1026 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1027 case LTTNG_DOMAIN_UST_PID
:
1028 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1031 ret
= LTTNG_ERR_UND
;
1043 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1045 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
1053 case LTTNG_DOMAIN_KERNEL
:
1055 struct ltt_kernel_session
*ksess
;
1056 struct ltt_kernel_channel
*kchan
;
1058 ksess
= session
->kernel_session
;
1061 * If a non-default channel has been created in the
1062 * session, explicitely require that -c chan_name needs
1065 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1066 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1070 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1071 if (kchan
== NULL
) {
1072 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1076 ret
= event_kernel_disable_all(kchan
);
1077 if (ret
!= LTTNG_OK
) {
1081 kernel_wait_quiescent(kernel_tracer_fd
);
1084 case LTTNG_DOMAIN_UST
:
1086 struct ltt_ust_session
*usess
;
1087 struct ltt_ust_channel
*uchan
;
1089 usess
= session
->ust_session
;
1092 * If a non-default channel has been created in the
1093 * session, explicitely require that -c chan_name needs
1096 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1097 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1101 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1103 if (uchan
== NULL
) {
1104 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1108 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1113 DBG3("Disable all UST events in channel %s completed", channel_name
);
1118 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1119 case LTTNG_DOMAIN_UST_PID
:
1120 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1123 ret
= LTTNG_ERR_UND
;
1135 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1137 int cmd_add_context(struct ltt_session
*session
, int domain
,
1138 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1140 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1143 case LTTNG_DOMAIN_KERNEL
:
1144 assert(session
->kernel_session
);
1146 if (session
->kernel_session
->channel_count
== 0) {
1147 /* Create default channel */
1148 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1149 if (ret
!= LTTNG_OK
) {
1152 chan_kern_created
= 1;
1154 /* Add kernel context to kernel tracer */
1155 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1156 if (ret
!= LTTNG_OK
) {
1160 case LTTNG_DOMAIN_UST
:
1162 struct ltt_ust_session
*usess
= session
->ust_session
;
1163 unsigned int chan_count
;
1167 chan_count
= lttng_ht_get_count(usess
->domain_global
.channels
);
1168 if (chan_count
== 0) {
1169 struct lttng_channel
*attr
;
1170 /* Create default channel */
1171 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1173 ret
= LTTNG_ERR_FATAL
;
1177 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1178 if (ret
!= LTTNG_OK
) {
1183 chan_ust_created
= 1;
1186 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1187 if (ret
!= LTTNG_OK
) {
1193 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1194 case LTTNG_DOMAIN_UST_PID
:
1195 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1198 ret
= LTTNG_ERR_UND
;
1205 if (chan_kern_created
) {
1206 struct ltt_kernel_channel
*kchan
=
1207 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1208 session
->kernel_session
);
1209 /* Created previously, this should NOT fail. */
1211 kernel_destroy_channel(kchan
);
1214 if (chan_ust_created
) {
1215 struct ltt_ust_channel
*uchan
=
1216 trace_ust_find_channel_by_name(
1217 session
->ust_session
->domain_global
.channels
,
1218 DEFAULT_CHANNEL_NAME
);
1219 /* Created previously, this should NOT fail. */
1221 /* Remove from the channel list of the session. */
1222 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1224 trace_ust_destroy_channel(uchan
);
1230 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1232 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1233 char *channel_name
, struct lttng_event
*event
,
1234 struct lttng_filter_bytecode
*filter
, int wpipe
)
1236 int ret
, channel_created
= 0;
1237 struct lttng_channel
*attr
;
1241 assert(channel_name
);
1245 switch (domain
->type
) {
1246 case LTTNG_DOMAIN_KERNEL
:
1248 struct ltt_kernel_channel
*kchan
;
1251 * If a non-default channel has been created in the
1252 * session, explicitely require that -c chan_name needs
1255 if (session
->kernel_session
->has_non_default_channel
1256 && channel_name
[0] == '\0') {
1257 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1261 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1262 session
->kernel_session
);
1263 if (kchan
== NULL
) {
1264 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1265 LTTNG_BUFFER_GLOBAL
);
1267 ret
= LTTNG_ERR_FATAL
;
1270 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1272 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1273 if (ret
!= LTTNG_OK
) {
1279 channel_created
= 1;
1282 /* Get the newly created kernel channel pointer */
1283 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1284 session
->kernel_session
);
1285 if (kchan
== NULL
) {
1286 /* This sould not happen... */
1287 ret
= LTTNG_ERR_FATAL
;
1291 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1292 if (ret
!= LTTNG_OK
) {
1293 if (channel_created
) {
1294 /* Let's not leak a useless channel. */
1295 kernel_destroy_channel(kchan
);
1300 kernel_wait_quiescent(kernel_tracer_fd
);
1303 case LTTNG_DOMAIN_UST
:
1305 struct ltt_ust_channel
*uchan
;
1306 struct ltt_ust_session
*usess
= session
->ust_session
;
1311 * If a non-default channel has been created in the
1312 * session, explicitely require that -c chan_name needs
1315 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1316 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1320 /* Get channel from global UST domain */
1321 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1323 if (uchan
== NULL
) {
1324 /* Create default channel */
1325 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1326 usess
->buffer_type
);
1328 ret
= LTTNG_ERR_FATAL
;
1331 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1333 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1334 if (ret
!= LTTNG_OK
) {
1340 /* Get the newly created channel reference back */
1341 uchan
= trace_ust_find_channel_by_name(
1342 usess
->domain_global
.channels
, channel_name
);
1346 /* At this point, the session and channel exist on the tracer */
1347 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
, filter
);
1348 if (ret
!= LTTNG_OK
) {
1354 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1355 case LTTNG_DOMAIN_UST_PID
:
1356 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1359 ret
= LTTNG_ERR_UND
;
1371 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1373 int cmd_enable_event_all(struct ltt_session
*session
,
1374 struct lttng_domain
*domain
, char *channel_name
, int event_type
,
1375 struct lttng_filter_bytecode
*filter
, int wpipe
)
1378 struct lttng_channel
*attr
;
1381 assert(channel_name
);
1385 switch (domain
->type
) {
1386 case LTTNG_DOMAIN_KERNEL
:
1388 struct ltt_kernel_channel
*kchan
;
1390 assert(session
->kernel_session
);
1393 * If a non-default channel has been created in the
1394 * session, explicitely require that -c chan_name needs
1397 if (session
->kernel_session
->has_non_default_channel
1398 && channel_name
[0] == '\0') {
1399 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1403 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1404 session
->kernel_session
);
1405 if (kchan
== NULL
) {
1406 /* Create default channel */
1407 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1408 LTTNG_BUFFER_GLOBAL
);
1410 ret
= LTTNG_ERR_FATAL
;
1413 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1415 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1416 if (ret
!= LTTNG_OK
) {
1422 /* Get the newly created kernel channel pointer */
1423 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1424 session
->kernel_session
);
1428 switch (event_type
) {
1429 case LTTNG_EVENT_SYSCALL
:
1430 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1432 case LTTNG_EVENT_TRACEPOINT
:
1434 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1435 * events already registered to the channel.
1437 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1439 case LTTNG_EVENT_ALL
:
1440 /* Enable syscalls and tracepoints */
1441 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1444 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1448 /* Manage return value */
1449 if (ret
!= LTTNG_OK
) {
1451 * On error, cmd_enable_channel call will take care of destroying
1452 * the created channel if it was needed.
1457 kernel_wait_quiescent(kernel_tracer_fd
);
1460 case LTTNG_DOMAIN_UST
:
1462 struct ltt_ust_channel
*uchan
;
1463 struct ltt_ust_session
*usess
= session
->ust_session
;
1468 * If a non-default channel has been created in the
1469 * session, explicitely require that -c chan_name needs
1472 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1473 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1477 /* Get channel from global UST domain */
1478 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1480 if (uchan
== NULL
) {
1481 /* Create default channel */
1482 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1483 usess
->buffer_type
);
1485 ret
= LTTNG_ERR_FATAL
;
1488 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1490 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1491 if (ret
!= LTTNG_OK
) {
1497 /* Get the newly created channel reference back */
1498 uchan
= trace_ust_find_channel_by_name(
1499 usess
->domain_global
.channels
, channel_name
);
1503 /* At this point, the session and channel exist on the tracer */
1505 switch (event_type
) {
1506 case LTTNG_EVENT_ALL
:
1507 case LTTNG_EVENT_TRACEPOINT
:
1508 ret
= event_ust_enable_all_tracepoints(usess
, uchan
, filter
);
1509 if (ret
!= LTTNG_OK
) {
1514 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1518 /* Manage return value */
1519 if (ret
!= LTTNG_OK
) {
1526 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1527 case LTTNG_DOMAIN_UST_PID
:
1528 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1531 ret
= LTTNG_ERR_UND
;
1544 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1546 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1549 ssize_t nb_events
= 0;
1552 case LTTNG_DOMAIN_KERNEL
:
1553 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1554 if (nb_events
< 0) {
1555 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1559 case LTTNG_DOMAIN_UST
:
1560 nb_events
= ust_app_list_events(events
);
1561 if (nb_events
< 0) {
1562 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1567 ret
= LTTNG_ERR_UND
;
1574 /* Return negative value to differentiate return code */
1579 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1581 ssize_t
cmd_list_tracepoint_fields(int domain
,
1582 struct lttng_event_field
**fields
)
1585 ssize_t nb_fields
= 0;
1588 case LTTNG_DOMAIN_UST
:
1589 nb_fields
= ust_app_list_event_fields(fields
);
1590 if (nb_fields
< 0) {
1591 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1595 case LTTNG_DOMAIN_KERNEL
:
1596 default: /* fall-through */
1597 ret
= LTTNG_ERR_UND
;
1604 /* Return negative value to differentiate return code */
1609 * Command LTTNG_START_TRACE processed by the client thread.
1611 int cmd_start_trace(struct ltt_session
*session
)
1614 struct ltt_kernel_session
*ksession
;
1615 struct ltt_ust_session
*usess
;
1619 /* Ease our life a bit ;) */
1620 ksession
= session
->kernel_session
;
1621 usess
= session
->ust_session
;
1623 if (session
->enabled
) {
1624 /* Already started. */
1625 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1629 session
->enabled
= 1;
1631 /* Kernel tracing */
1632 if (ksession
!= NULL
) {
1633 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1634 if (ret
!= LTTNG_OK
) {
1639 /* Flag session that trace should start automatically */
1641 usess
->start_trace
= 1;
1643 ret
= ust_app_start_trace_all(usess
);
1645 ret
= LTTNG_ERR_UST_START_FAIL
;
1650 session
->started
= 1;
1659 * Command LTTNG_STOP_TRACE processed by the client thread.
1661 int cmd_stop_trace(struct ltt_session
*session
)
1664 struct ltt_kernel_channel
*kchan
;
1665 struct ltt_kernel_session
*ksession
;
1666 struct ltt_ust_session
*usess
;
1671 ksession
= session
->kernel_session
;
1672 usess
= session
->ust_session
;
1674 if (!session
->enabled
) {
1675 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1679 session
->enabled
= 0;
1682 if (ksession
&& ksession
->started
) {
1683 DBG("Stop kernel tracing");
1685 /* Flush metadata if exist */
1686 if (ksession
->metadata_stream_fd
>= 0) {
1687 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1689 ERR("Kernel metadata flush failed");
1693 /* Flush all buffers before stopping */
1694 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1695 ret
= kernel_flush_buffer(kchan
);
1697 ERR("Kernel flush buffer error");
1701 ret
= kernel_stop_session(ksession
);
1703 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1707 kernel_wait_quiescent(kernel_tracer_fd
);
1709 ksession
->started
= 0;
1712 if (usess
&& usess
->start_trace
) {
1713 usess
->start_trace
= 0;
1715 ret
= ust_app_stop_trace_all(usess
);
1717 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1729 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1731 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1732 size_t nb_uri
, struct lttng_uri
*uris
)
1735 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1736 struct ltt_ust_session
*usess
= session
->ust_session
;
1737 struct consumer_output
*consumer
= NULL
;
1743 /* Can't enable consumer after session started. */
1744 if (session
->enabled
) {
1745 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1750 * This case switch makes sure the domain session has a temporary consumer
1751 * so the URL can be set.
1755 /* Code flow error. A session MUST always have a consumer object */
1756 assert(session
->consumer
);
1758 * The URL will be added to the tracing session consumer instead of a
1759 * specific domain consumer.
1761 consumer
= session
->consumer
;
1763 case LTTNG_DOMAIN_KERNEL
:
1764 /* Code flow error if we don't have a kernel session here. */
1766 assert(ksess
->consumer
);
1767 consumer
= ksess
->consumer
;
1769 case LTTNG_DOMAIN_UST
:
1770 /* Code flow error if we don't have a kernel session here. */
1772 assert(usess
->consumer
);
1773 consumer
= usess
->consumer
;
1777 for (i
= 0; i
< nb_uri
; i
++) {
1778 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1779 if (ret
!= LTTNG_OK
) {
1792 * Command LTTNG_CREATE_SESSION processed by the client thread.
1794 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1795 size_t nb_uri
, lttng_sock_cred
*creds
, unsigned int live_timer
)
1798 struct ltt_session
*session
;
1804 * Verify if the session already exist
1806 * XXX: There is no need for the session lock list here since the caller
1807 * (process_client_msg) is holding it. We might want to change that so a
1808 * single command does not lock the entire session list.
1810 session
= session_find_by_name(name
);
1811 if (session
!= NULL
) {
1812 ret
= LTTNG_ERR_EXIST_SESS
;
1816 /* Create tracing session in the registry */
1817 ret
= session_create(name
, LTTNG_SOCK_GET_UID_CRED(creds
),
1818 LTTNG_SOCK_GET_GID_CRED(creds
));
1819 if (ret
!= LTTNG_OK
) {
1824 * Get the newly created session pointer back
1826 * XXX: There is no need for the session lock list here since the caller
1827 * (process_client_msg) is holding it. We might want to change that so a
1828 * single command does not lock the entire session list.
1830 session
= session_find_by_name(name
);
1833 session
->live_timer
= live_timer
;
1834 /* Create default consumer output for the session not yet created. */
1835 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1836 if (session
->consumer
== NULL
) {
1837 ret
= LTTNG_ERR_FATAL
;
1838 goto consumer_error
;
1842 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1843 if (ret
!= LTTNG_OK
) {
1844 goto consumer_error
;
1846 session
->output_traces
= 1;
1848 session
->output_traces
= 0;
1849 DBG2("Session %s created with no output", session
->name
);
1852 session
->consumer
->enabled
= 1;
1857 session_destroy(session
);
1864 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
1866 int cmd_create_session_snapshot(char *name
, struct lttng_uri
*uris
,
1867 size_t nb_uri
, lttng_sock_cred
*creds
)
1870 struct ltt_session
*session
;
1871 struct snapshot_output
*new_output
= NULL
;
1877 * Create session in no output mode with URIs set to NULL. The uris we've
1878 * received are for a default snapshot output if one.
1880 ret
= cmd_create_session_uri(name
, NULL
, 0, creds
, -1);
1881 if (ret
!= LTTNG_OK
) {
1885 /* Get the newly created session pointer back. This should NEVER fail. */
1886 session
= session_find_by_name(name
);
1889 /* Flag session for snapshot mode. */
1890 session
->snapshot_mode
= 1;
1892 /* Skip snapshot output creation if no URI is given. */
1897 new_output
= snapshot_output_alloc();
1899 ret
= LTTNG_ERR_NOMEM
;
1900 goto error_snapshot_alloc
;
1903 ret
= snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE
, NULL
,
1904 uris
, nb_uri
, session
->consumer
, new_output
, &session
->snapshot
);
1906 if (ret
== -ENOMEM
) {
1907 ret
= LTTNG_ERR_NOMEM
;
1909 ret
= LTTNG_ERR_INVALID
;
1911 goto error_snapshot
;
1915 snapshot_add_output(&session
->snapshot
, new_output
);
1922 snapshot_output_destroy(new_output
);
1923 error_snapshot_alloc
:
1924 session_destroy(session
);
1930 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1932 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1935 struct ltt_ust_session
*usess
;
1936 struct ltt_kernel_session
*ksess
;
1941 usess
= session
->ust_session
;
1942 ksess
= session
->kernel_session
;
1944 /* Clean kernel session teardown */
1945 kernel_destroy_session(ksess
);
1947 /* UST session teardown */
1949 /* Close any relayd session */
1950 consumer_output_send_destroy_relayd(usess
->consumer
);
1952 /* Destroy every UST application related to this session. */
1953 ret
= ust_app_destroy_trace_all(usess
);
1955 ERR("Error in ust_app_destroy_trace_all");
1958 /* Clean up the rest. */
1959 trace_ust_destroy_session(usess
);
1963 * Must notify the kernel thread here to update it's poll set in order to
1964 * remove the channel(s)' fd just destroyed.
1966 ret
= notify_thread_pipe(wpipe
);
1968 PERROR("write kernel poll pipe");
1971 ret
= session_destroy(session
);
1977 * Command LTTNG_CALIBRATE processed by the client thread.
1979 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1984 case LTTNG_DOMAIN_KERNEL
:
1986 struct lttng_kernel_calibrate kcalibrate
;
1988 kcalibrate
.type
= calibrate
->type
;
1989 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1991 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1996 case LTTNG_DOMAIN_UST
:
1998 struct lttng_ust_calibrate ucalibrate
;
2000 ucalibrate
.type
= calibrate
->type
;
2001 ret
= ust_app_calibrate_glb(&ucalibrate
);
2003 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
2009 ret
= LTTNG_ERR_UND
;
2020 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2022 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2023 const char *sock_path
, struct consumer_data
*cdata
)
2026 struct consumer_socket
*socket
= NULL
;
2033 case LTTNG_DOMAIN_KERNEL
:
2035 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2039 /* Can't register a consumer if there is already one */
2040 if (ksess
->consumer_fds_sent
!= 0) {
2041 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2045 sock
= lttcomm_connect_unix_sock(sock_path
);
2047 ret
= LTTNG_ERR_CONNECT_FAIL
;
2050 cdata
->cmd_sock
= sock
;
2052 socket
= consumer_allocate_socket(&cdata
->cmd_sock
);
2053 if (socket
== NULL
) {
2056 PERROR("close register consumer");
2058 cdata
->cmd_sock
= -1;
2059 ret
= LTTNG_ERR_FATAL
;
2063 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
2064 if (socket
->lock
== NULL
) {
2065 PERROR("zmalloc pthread mutex");
2066 ret
= LTTNG_ERR_FATAL
;
2069 pthread_mutex_init(socket
->lock
, NULL
);
2070 socket
->registered
= 1;
2073 consumer_add_socket(socket
, ksess
->consumer
);
2076 pthread_mutex_lock(&cdata
->pid_mutex
);
2078 pthread_mutex_unlock(&cdata
->pid_mutex
);
2083 /* TODO: Userspace tracing */
2084 ret
= LTTNG_ERR_UND
;
2092 consumer_destroy_socket(socket
);
2098 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2100 ssize_t
cmd_list_domains(struct ltt_session
*session
,
2101 struct lttng_domain
**domains
)
2106 if (session
->kernel_session
!= NULL
) {
2107 DBG3("Listing domains found kernel domain");
2111 if (session
->ust_session
!= NULL
) {
2112 DBG3("Listing domains found UST global domain");
2116 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2117 if (*domains
== NULL
) {
2118 ret
= LTTNG_ERR_FATAL
;
2122 if (session
->kernel_session
!= NULL
) {
2123 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2127 if (session
->ust_session
!= NULL
) {
2128 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2129 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2136 /* Return negative value to differentiate return code */
2142 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2144 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
2145 struct lttng_channel
**channels
)
2148 ssize_t nb_chan
= 0;
2151 case LTTNG_DOMAIN_KERNEL
:
2152 if (session
->kernel_session
!= NULL
) {
2153 nb_chan
= session
->kernel_session
->channel_count
;
2155 DBG3("Number of kernel channels %zd", nb_chan
);
2157 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2160 case LTTNG_DOMAIN_UST
:
2161 if (session
->ust_session
!= NULL
) {
2162 nb_chan
= lttng_ht_get_count(
2163 session
->ust_session
->domain_global
.channels
);
2165 DBG3("Number of UST global channels %zd", nb_chan
);
2167 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2172 ret
= LTTNG_ERR_UND
;
2177 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2178 if (*channels
== NULL
) {
2179 ret
= LTTNG_ERR_FATAL
;
2183 list_lttng_channels(domain
, session
, *channels
);
2186 /* Ret value was set in the domain switch case */
2193 /* Return negative value to differentiate return code */
2198 * Command LTTNG_LIST_EVENTS processed by the client thread.
2200 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2201 char *channel_name
, struct lttng_event
**events
)
2204 ssize_t nb_event
= 0;
2207 case LTTNG_DOMAIN_KERNEL
:
2208 if (session
->kernel_session
!= NULL
) {
2209 nb_event
= list_lttng_kernel_events(channel_name
,
2210 session
->kernel_session
, events
);
2213 case LTTNG_DOMAIN_UST
:
2215 if (session
->ust_session
!= NULL
) {
2216 nb_event
= list_lttng_ust_global_events(channel_name
,
2217 &session
->ust_session
->domain_global
, events
);
2222 ret
= LTTNG_ERR_UND
;
2229 /* Return negative value to differentiate return code */
2234 * Using the session list, filled a lttng_session array to send back to the
2235 * client for session listing.
2237 * The session list lock MUST be acquired before calling this function. Use
2238 * session_lock_list() and session_unlock_list().
2240 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2245 struct ltt_session
*session
;
2246 struct ltt_session_list
*list
= session_get_list();
2248 DBG("Getting all available session for UID %d GID %d",
2251 * Iterate over session list and append data after the control struct in
2254 cds_list_for_each_entry(session
, &list
->head
, list
) {
2256 * Only list the sessions the user can control.
2258 if (!session_access_ok(session
, uid
, gid
)) {
2262 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2263 struct ltt_ust_session
*usess
= session
->ust_session
;
2265 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2266 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2267 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2268 ret
= build_network_session_path(sessions
[i
].path
,
2269 sizeof(sessions
[i
].path
), session
);
2271 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
2272 session
->consumer
->dst
.trace_path
);
2275 PERROR("snprintf session path");
2279 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2280 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2281 sessions
[i
].enabled
= session
->enabled
;
2282 sessions
[i
].snapshot_mode
= session
->snapshot_mode
;
2288 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2289 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2291 int cmd_data_pending(struct ltt_session
*session
)
2294 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2295 struct ltt_ust_session
*usess
= session
->ust_session
;
2299 /* Session MUST be stopped to ask for data availability. */
2300 if (session
->enabled
) {
2301 ret
= LTTNG_ERR_SESSION_STARTED
;
2305 if (ksess
&& ksess
->consumer
) {
2306 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2308 /* Data is still being extracted for the kernel. */
2313 if (usess
&& usess
->consumer
) {
2314 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2316 /* Data is still being extracted for the kernel. */
2321 /* Data is ready to be read by a viewer */
2329 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2331 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2333 int cmd_snapshot_add_output(struct ltt_session
*session
,
2334 struct lttng_snapshot_output
*output
, uint32_t *id
)
2337 struct snapshot_output
*new_output
;
2342 DBG("Cmd snapshot add output for session %s", session
->name
);
2345 * Permission denied to create an output if the session is not
2346 * set in no output mode.
2348 if (session
->output_traces
) {
2349 ret
= LTTNG_ERR_EPERM
;
2353 /* Only one output is allowed until we have the "tee" feature. */
2354 if (session
->snapshot
.nb_output
== 1) {
2355 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
2359 new_output
= snapshot_output_alloc();
2361 ret
= LTTNG_ERR_NOMEM
;
2365 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2366 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
2367 &session
->snapshot
);
2369 if (ret
== -ENOMEM
) {
2370 ret
= LTTNG_ERR_NOMEM
;
2372 ret
= LTTNG_ERR_INVALID
;
2378 snapshot_add_output(&session
->snapshot
, new_output
);
2380 *id
= new_output
->id
;
2387 snapshot_output_destroy(new_output
);
2393 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2395 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2397 int cmd_snapshot_del_output(struct ltt_session
*session
,
2398 struct lttng_snapshot_output
*output
)
2401 struct snapshot_output
*sout
= NULL
;
2409 * Permission denied to create an output if the session is not
2410 * set in no output mode.
2412 if (session
->output_traces
) {
2413 ret
= LTTNG_ERR_EPERM
;
2418 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
2420 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
2421 } else if (*output
->name
!= '\0') {
2422 DBG("Cmd snapshot del output name %s for session %s", output
->name
,
2424 sout
= snapshot_find_output_by_name(output
->name
, &session
->snapshot
);
2427 ret
= LTTNG_ERR_INVALID
;
2431 snapshot_delete_output(&session
->snapshot
, sout
);
2432 snapshot_output_destroy(sout
);
2441 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2443 * If no output is available, outputs is untouched and 0 is returned.
2445 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2447 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
2448 struct lttng_snapshot_output
**outputs
)
2451 struct lttng_snapshot_output
*list
;
2452 struct lttng_ht_iter iter
;
2453 struct snapshot_output
*output
;
2458 DBG("Cmd snapshot list outputs for session %s", session
->name
);
2461 * Permission denied to create an output if the session is not
2462 * set in no output mode.
2464 if (session
->output_traces
) {
2465 ret
= LTTNG_ERR_EPERM
;
2469 if (session
->snapshot
.nb_output
== 0) {
2474 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
2476 ret
= LTTNG_ERR_NOMEM
;
2480 /* Copy list from session to the new list object. */
2481 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
2482 output
, node
.node
) {
2483 assert(output
->consumer
);
2484 list
[idx
].id
= output
->id
;
2485 list
[idx
].max_size
= output
->max_size
;
2486 strncpy(list
[idx
].name
, output
->name
, sizeof(list
[idx
].name
));
2487 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
2488 strncpy(list
[idx
].ctrl_url
, output
->consumer
->dst
.trace_path
,
2489 sizeof(list
[idx
].ctrl_url
));
2492 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
2493 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
2495 ret
= LTTNG_ERR_NOMEM
;
2500 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
2501 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
2503 ret
= LTTNG_ERR_NOMEM
;
2511 return session
->snapshot
.nb_output
;
2520 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2521 * snapshot output is *not* set with a remote destination.
2523 * Return 0 on success or a LTTNG_ERR code.
2525 static int set_relayd_for_snapshot(struct consumer_output
*consumer
,
2526 struct snapshot_output
*snap_output
, struct ltt_session
*session
)
2529 struct lttng_ht_iter iter
;
2530 struct consumer_socket
*socket
;
2533 assert(snap_output
);
2536 DBG2("Set relayd object from snapshot output");
2538 /* Ignore if snapshot consumer output is not network. */
2539 if (snap_output
->consumer
->type
!= CONSUMER_DST_NET
) {
2544 * For each consumer socket, create and send the relayd object of the
2548 cds_lfht_for_each_entry(snap_output
->consumer
->socks
->ht
, &iter
.iter
,
2549 socket
, node
.node
) {
2550 ret
= send_consumer_relayd_sockets(0, session
->id
,
2551 snap_output
->consumer
, socket
,
2552 session
->name
, session
->hostname
,
2553 session
->live_timer
);
2554 if (ret
!= LTTNG_OK
) {
2566 * Record a kernel snapshot.
2568 * Return 0 on success or a LTTNG_ERR code.
2570 static int record_kernel_snapshot(struct ltt_kernel_session
*ksess
,
2571 struct snapshot_output
*output
, struct ltt_session
*session
,
2572 int wait
, int nb_streams
)
2580 /* Get the datetime for the snapshot output directory. */
2581 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
2582 sizeof(output
->datetime
));
2584 ret
= LTTNG_ERR_INVALID
;
2589 * Copy kernel session sockets so we can communicate with the right
2590 * consumer for the snapshot record command.
2592 ret
= consumer_copy_sockets(output
->consumer
, ksess
->consumer
);
2594 ret
= LTTNG_ERR_NOMEM
;
2598 ret
= set_relayd_for_snapshot(ksess
->consumer
, output
, session
);
2599 if (ret
!= LTTNG_OK
) {
2600 goto error_snapshot
;
2603 ret
= kernel_snapshot_record(ksess
, output
, wait
, nb_streams
);
2604 if (ret
!= LTTNG_OK
) {
2605 goto error_snapshot
;
2611 /* Clean up copied sockets so this output can use some other later on. */
2612 consumer_destroy_output_sockets(output
->consumer
);
2618 * Record a UST snapshot.
2620 * Return 0 on success or a LTTNG_ERR error code.
2622 static int record_ust_snapshot(struct ltt_ust_session
*usess
,
2623 struct snapshot_output
*output
, struct ltt_session
*session
,
2624 int wait
, int nb_streams
)
2632 /* Get the datetime for the snapshot output directory. */
2633 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
2634 sizeof(output
->datetime
));
2636 ret
= LTTNG_ERR_INVALID
;
2641 * Copy UST session sockets so we can communicate with the right
2642 * consumer for the snapshot record command.
2644 ret
= consumer_copy_sockets(output
->consumer
, usess
->consumer
);
2646 ret
= LTTNG_ERR_NOMEM
;
2650 ret
= set_relayd_for_snapshot(usess
->consumer
, output
, session
);
2651 if (ret
!= LTTNG_OK
) {
2652 goto error_snapshot
;
2655 ret
= ust_app_snapshot_record(usess
, output
, wait
, nb_streams
);
2657 if (ret
== -EINVAL
) {
2658 ret
= LTTNG_ERR_INVALID
;
2659 goto error_snapshot
;
2662 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
2663 goto error_snapshot
;
2669 /* Clean up copied sockets so this output can use some other later on. */
2670 consumer_destroy_output_sockets(output
->consumer
);
2676 * Returns the total number of streams for a session or a negative value
2679 static unsigned int get_total_nb_stream(struct ltt_session
*session
)
2681 unsigned int total_streams
= 0;
2683 if (session
->kernel_session
) {
2684 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2686 total_streams
+= ksess
->stream_count_global
;
2689 if (session
->ust_session
) {
2690 struct ltt_ust_session
*usess
= session
->ust_session
;
2692 total_streams
+= ust_app_get_nb_stream(usess
);
2695 return total_streams
;
2699 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2701 * The wait parameter is ignored so this call always wait for the snapshot to
2702 * complete before returning.
2704 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2706 int cmd_snapshot_record(struct ltt_session
*session
,
2707 struct lttng_snapshot_output
*output
, int wait
)
2710 unsigned int use_tmp_output
= 0;
2711 struct snapshot_output tmp_output
;
2712 unsigned int nb_streams
, snapshot_success
= 0;
2716 DBG("Cmd snapshot record for session %s", session
->name
);
2719 * Permission denied to create an output if the session is not
2720 * set in no output mode.
2722 if (session
->output_traces
) {
2723 ret
= LTTNG_ERR_EPERM
;
2727 /* The session needs to be started at least once. */
2728 if (!session
->started
) {
2729 ret
= LTTNG_ERR_START_SESSION_ONCE
;
2733 /* Use temporary output for the session. */
2734 if (output
&& *output
->ctrl_url
!= '\0') {
2735 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2736 output
->ctrl_url
, output
->data_url
, session
->consumer
,
2739 if (ret
== -ENOMEM
) {
2740 ret
= LTTNG_ERR_NOMEM
;
2742 ret
= LTTNG_ERR_INVALID
;
2746 /* Use the global session count for the temporary snapshot. */
2747 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
2752 * Get the total number of stream of that session which is used by the
2753 * maximum size of the snapshot feature.
2755 nb_streams
= get_total_nb_stream(session
);
2757 if (session
->kernel_session
) {
2758 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2760 if (use_tmp_output
) {
2761 ret
= record_kernel_snapshot(ksess
, &tmp_output
, session
,
2763 if (ret
!= LTTNG_OK
) {
2766 snapshot_success
= 1;
2768 struct snapshot_output
*sout
;
2769 struct lttng_ht_iter iter
;
2772 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
2773 &iter
.iter
, sout
, node
.node
) {
2775 * Make a local copy of the output and assign the possible
2776 * temporary value given by the caller.
2778 memset(&tmp_output
, 0, sizeof(tmp_output
));
2779 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
2781 /* Use temporary max size. */
2782 if (output
->max_size
!= (uint64_t) -1ULL) {
2783 tmp_output
.max_size
= output
->max_size
;
2786 /* Use temporary name. */
2787 if (*output
->name
!= '\0') {
2788 strncpy(tmp_output
.name
, output
->name
,
2789 sizeof(tmp_output
.name
));
2792 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
2794 ret
= record_kernel_snapshot(ksess
, &tmp_output
,
2795 session
, wait
, nb_streams
);
2796 if (ret
!= LTTNG_OK
) {
2800 snapshot_success
= 1;
2806 if (session
->ust_session
) {
2807 struct ltt_ust_session
*usess
= session
->ust_session
;
2809 if (use_tmp_output
) {
2810 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
2812 if (ret
!= LTTNG_OK
) {
2815 snapshot_success
= 1;
2817 struct snapshot_output
*sout
;
2818 struct lttng_ht_iter iter
;
2821 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
2822 &iter
.iter
, sout
, node
.node
) {
2824 * Make a local copy of the output and assign the possible
2825 * temporary value given by the caller.
2827 memset(&tmp_output
, 0, sizeof(tmp_output
));
2828 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
2830 /* Use temporary max size. */
2831 if (output
->max_size
!= (uint64_t) -1ULL) {
2832 tmp_output
.max_size
= output
->max_size
;
2835 /* Use temporary name. */
2836 if (*output
->name
!= '\0') {
2837 strncpy(tmp_output
.name
, output
->name
,
2838 sizeof(tmp_output
.name
));
2841 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
2843 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
2845 if (ret
!= LTTNG_OK
) {
2849 snapshot_success
= 1;
2855 if (snapshot_success
) {
2856 session
->snapshot
.nb_snapshot
++;
2858 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
2866 * Init command subsystem.
2871 * Set network sequence index to 1 for streams to match a relayd
2872 * socket on the consumer side.
2874 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
2875 relayd_net_seq_idx
= 1;
2876 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
2878 DBG("Command subsystem initialized");