2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 #include <urcu/list.h>
22 #include <urcu/uatomic.h>
24 #include <common/defaults.h>
25 #include <common/common.h>
26 #include <common/sessiond-comm/sessiond-comm.h>
27 #include <common/relayd/relayd.h>
28 #include <common/utils.h>
35 #include "kernel-consumer.h"
36 #include "lttng-sessiond.h"
42 * Used to keep a unique index for each relayd socket created where this value
43 * is associated with streams on the consumer so it can match the right relayd
44 * to send to. It must be accessed with the relayd_net_seq_idx_lock
47 static pthread_mutex_t relayd_net_seq_idx_lock
= PTHREAD_MUTEX_INITIALIZER
;
48 static uint64_t relayd_net_seq_idx
;
51 * Create a session path used by list_lttng_sessions for the case that the
52 * session consumer is on the network.
54 static int build_network_session_path(char *dst
, size_t size
,
55 struct ltt_session
*session
)
57 int ret
, kdata_port
, udata_port
;
58 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
59 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
64 memset(tmp_urls
, 0, sizeof(tmp_urls
));
65 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
67 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
69 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
70 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
71 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
74 if (session
->ust_session
&& session
->ust_session
->consumer
) {
75 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
76 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
79 if (uuri
== NULL
&& kuri
== NULL
) {
80 uri
= &session
->consumer
->dst
.net
.control
;
81 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
82 } else if (kuri
&& uuri
) {
83 ret
= uri_compare(kuri
, uuri
);
87 /* Build uuri URL string */
88 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
95 } else if (kuri
&& uuri
== NULL
) {
97 } else if (uuri
&& kuri
== NULL
) {
101 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
107 * Do we have a UST url set. If yes, this means we have both kernel and UST
110 if (*tmp_uurl
!= '\0') {
111 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
112 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
115 if (kuri
|| (!kuri
&& !uuri
)) {
118 /* No kernel URI, use the UST port. */
121 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, dport
);
129 * Fill lttng_channel array of all channels.
131 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
132 struct lttng_channel
*channels
)
135 struct ltt_kernel_channel
*kchan
;
137 DBG("Listing channels for session %s", session
->name
);
140 case LTTNG_DOMAIN_KERNEL
:
141 /* Kernel channels */
142 if (session
->kernel_session
!= NULL
) {
143 cds_list_for_each_entry(kchan
,
144 &session
->kernel_session
->channel_list
.head
, list
) {
145 /* Copy lttng_channel struct to array */
146 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
147 channels
[i
].enabled
= kchan
->enabled
;
152 case LTTNG_DOMAIN_UST
:
154 struct lttng_ht_iter iter
;
155 struct ltt_ust_channel
*uchan
;
158 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
159 &iter
.iter
, uchan
, node
.node
) {
160 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
161 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
162 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
163 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
164 channels
[i
].attr
.switch_timer_interval
=
165 uchan
->attr
.switch_timer_interval
;
166 channels
[i
].attr
.read_timer_interval
=
167 uchan
->attr
.read_timer_interval
;
168 channels
[i
].enabled
= uchan
->enabled
;
169 switch (uchan
->attr
.output
) {
172 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
186 * Create a list of ust global domain events.
188 static int list_lttng_ust_global_events(char *channel_name
,
189 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
192 unsigned int nb_event
= 0;
193 struct lttng_ht_iter iter
;
194 struct lttng_ht_node_str
*node
;
195 struct ltt_ust_channel
*uchan
;
196 struct ltt_ust_event
*uevent
;
197 struct lttng_event
*tmp
;
199 DBG("Listing UST global events for channel %s", channel_name
);
203 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
204 node
= lttng_ht_iter_get_node_str(&iter
);
206 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
210 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
212 nb_event
+= lttng_ht_get_count(uchan
->events
);
219 DBG3("Listing UST global %d events", nb_event
);
221 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
223 ret
= LTTNG_ERR_FATAL
;
227 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
228 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
229 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
230 tmp
[i
].enabled
= uevent
->enabled
;
232 switch (uevent
->attr
.instrumentation
) {
233 case LTTNG_UST_TRACEPOINT
:
234 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
236 case LTTNG_UST_PROBE
:
237 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
239 case LTTNG_UST_FUNCTION
:
240 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
244 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
245 switch (uevent
->attr
.loglevel_type
) {
246 case LTTNG_UST_LOGLEVEL_ALL
:
247 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
249 case LTTNG_UST_LOGLEVEL_RANGE
:
250 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
252 case LTTNG_UST_LOGLEVEL_SINGLE
:
253 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
256 if (uevent
->filter
) {
271 * Fill lttng_event array of all kernel events in the channel.
273 static int list_lttng_kernel_events(char *channel_name
,
274 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
277 unsigned int nb_event
;
278 struct ltt_kernel_event
*event
;
279 struct ltt_kernel_channel
*kchan
;
281 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
283 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
287 nb_event
= kchan
->event_count
;
289 DBG("Listing events for channel %s", kchan
->channel
->name
);
295 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
296 if (*events
== NULL
) {
297 ret
= LTTNG_ERR_FATAL
;
301 /* Kernel channels */
302 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
303 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
304 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
305 (*events
)[i
].enabled
= event
->enabled
;
307 switch (event
->event
->instrumentation
) {
308 case LTTNG_KERNEL_TRACEPOINT
:
309 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
311 case LTTNG_KERNEL_KRETPROBE
:
312 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
313 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
314 sizeof(struct lttng_kernel_kprobe
));
316 case LTTNG_KERNEL_KPROBE
:
317 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
318 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
319 sizeof(struct lttng_kernel_kprobe
));
321 case LTTNG_KERNEL_FUNCTION
:
322 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
323 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
324 sizeof(struct lttng_kernel_function
));
326 case LTTNG_KERNEL_NOOP
:
327 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
329 case LTTNG_KERNEL_SYSCALL
:
330 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
332 case LTTNG_KERNEL_ALL
:
343 /* Negate the error code to differentiate the size from an error */
348 * Add URI so the consumer output object. Set the correct path depending on the
349 * domain adding the default trace directory.
351 static int add_uri_to_consumer(struct consumer_output
*consumer
,
352 struct lttng_uri
*uri
, int domain
, const char *session_name
)
355 const char *default_trace_dir
;
359 if (consumer
== NULL
) {
360 DBG("No consumer detected. Don't add URI. Stopping.");
361 ret
= LTTNG_ERR_NO_CONSUMER
;
366 case LTTNG_DOMAIN_KERNEL
:
367 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
369 case LTTNG_DOMAIN_UST
:
370 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
374 * This case is possible is we try to add the URI to the global tracing
375 * session consumer object which in this case there is no subdir.
377 default_trace_dir
= "";
380 switch (uri
->dtype
) {
383 DBG2("Setting network URI to consumer");
385 if (consumer
->type
== CONSUMER_DST_NET
) {
386 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
387 consumer
->dst
.net
.control_isset
) ||
388 (uri
->stype
== LTTNG_STREAM_DATA
&&
389 consumer
->dst
.net
.data_isset
)) {
390 ret
= LTTNG_ERR_URL_EXIST
;
394 memset(&consumer
->dst
.net
, 0, sizeof(consumer
->dst
.net
));
397 consumer
->type
= CONSUMER_DST_NET
;
399 /* Set URI into consumer output object */
400 ret
= consumer_set_network_uri(consumer
, uri
);
404 } else if (ret
== 1) {
406 * URI was the same in the consumer so we do not append the subdir
407 * again so to not duplicate output dir.
412 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
413 ret
= consumer_set_subdir(consumer
, session_name
);
415 ret
= LTTNG_ERR_FATAL
;
420 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
421 /* On a new subdir, reappend the default trace dir. */
422 strncat(consumer
->subdir
, default_trace_dir
,
423 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
424 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
429 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
430 memset(consumer
->dst
.trace_path
, 0,
431 sizeof(consumer
->dst
.trace_path
));
432 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
433 sizeof(consumer
->dst
.trace_path
));
434 /* Append default trace dir */
435 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
436 sizeof(consumer
->dst
.trace_path
) -
437 strlen(consumer
->dst
.trace_path
) - 1);
438 /* Flag consumer as local. */
439 consumer
->type
= CONSUMER_DST_LOCAL
;
450 * Init tracing by creating trace directory and sending fds kernel consumer.
452 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
455 struct lttng_ht_iter iter
;
456 struct consumer_socket
*socket
;
462 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
463 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
465 pthread_mutex_lock(socket
->lock
);
466 ret
= kernel_consumer_send_session(socket
, session
);
467 pthread_mutex_unlock(socket
->lock
);
469 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
481 * Create a socket to the relayd using the URI.
483 * On success, the relayd_sock pointer is set to the created socket.
484 * Else, it's stays untouched and a lttcomm error code is returned.
486 static int create_connect_relayd(struct lttng_uri
*uri
,
487 struct lttcomm_relayd_sock
**relayd_sock
)
490 struct lttcomm_relayd_sock
*rsock
;
492 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
493 RELAYD_VERSION_COMM_MINOR
);
495 ret
= LTTNG_ERR_FATAL
;
500 * Connect to relayd so we can proceed with a session creation. This call
501 * can possibly block for an arbitrary amount of time to set the health
502 * state to be in poll execution.
505 ret
= relayd_connect(rsock
);
508 ERR("Unable to reach lttng-relayd");
509 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
513 /* Create socket for control stream. */
514 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
515 DBG3("Creating relayd stream socket from URI");
517 /* Check relayd version */
518 ret
= relayd_version_check(rsock
);
520 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
523 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
524 DBG3("Creating relayd data socket from URI");
526 /* Command is not valid */
527 ERR("Relayd invalid stream type: %d", uri
->stype
);
528 ret
= LTTNG_ERR_INVALID
;
532 *relayd_sock
= rsock
;
537 /* The returned value is not useful since we are on an error path. */
538 (void) relayd_close(rsock
);
546 * Connect to the relayd using URI and send the socket to the right consumer.
548 static int send_consumer_relayd_socket(int domain
, unsigned int session_id
,
549 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
550 struct consumer_socket
*consumer_sock
)
553 struct lttcomm_relayd_sock
*rsock
= NULL
;
555 /* Connect to relayd and make version check if uri is the control. */
556 ret
= create_connect_relayd(relayd_uri
, &rsock
);
557 if (ret
!= LTTNG_OK
) {
562 /* Set the network sequence index if not set. */
563 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
564 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
566 * Increment net_seq_idx because we are about to transfer the
567 * new relayd socket to the consumer.
568 * Assign unique key so the consumer can match streams.
570 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
571 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
574 /* Send relayd socket to consumer. */
575 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
576 relayd_uri
->stype
, session_id
);
578 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
582 /* Flag that the corresponding socket was sent. */
583 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
584 consumer_sock
->control_sock_sent
= 1;
585 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
586 consumer_sock
->data_sock_sent
= 1;
592 * Close socket which was dup on the consumer side. The session daemon does
593 * NOT keep track of the relayd socket(s) once transfer to the consumer.
597 (void) relayd_close(rsock
);
601 if (ret
!= LTTNG_OK
) {
603 * The consumer output for this session should not be used anymore
604 * since the relayd connection failed thus making any tracing or/and
605 * streaming not usable.
607 consumer
->enabled
= 0;
613 * Send both relayd sockets to a specific consumer and domain. This is a
614 * helper function to facilitate sending the information to the consumer for a
617 static int send_consumer_relayd_sockets(int domain
, unsigned int session_id
,
618 struct consumer_output
*consumer
, struct consumer_socket
*sock
)
625 /* Sending control relayd socket. */
626 if (!sock
->control_sock_sent
) {
627 ret
= send_consumer_relayd_socket(domain
, session_id
,
628 &consumer
->dst
.net
.control
, consumer
, sock
);
629 if (ret
!= LTTNG_OK
) {
634 /* Sending data relayd socket. */
635 if (!sock
->data_sock_sent
) {
636 ret
= send_consumer_relayd_socket(domain
, session_id
,
637 &consumer
->dst
.net
.data
, consumer
, sock
);
638 if (ret
!= LTTNG_OK
) {
648 * Setup relayd connections for a tracing session. First creates the socket to
649 * the relayd and send them to the right domain consumer. Consumer type MUST be
652 int cmd_setup_relayd(struct ltt_session
*session
)
655 struct ltt_ust_session
*usess
;
656 struct ltt_kernel_session
*ksess
;
657 struct consumer_socket
*socket
;
658 struct lttng_ht_iter iter
;
662 usess
= session
->ust_session
;
663 ksess
= session
->kernel_session
;
665 DBG("Setting relayd for session %s", session
->name
);
669 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
670 && usess
->consumer
->enabled
) {
671 /* For each consumer socket, send relayd sockets */
672 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
674 pthread_mutex_lock(socket
->lock
);
675 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
->id
,
676 usess
->consumer
, socket
);
677 pthread_mutex_unlock(socket
->lock
);
678 if (ret
!= LTTNG_OK
) {
681 /* Session is now ready for network streaming. */
682 session
->net_handle
= 1;
686 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
687 && ksess
->consumer
->enabled
) {
688 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
690 pthread_mutex_lock(socket
->lock
);
691 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
->id
,
692 ksess
->consumer
, socket
);
693 pthread_mutex_unlock(socket
->lock
);
694 if (ret
!= LTTNG_OK
) {
697 /* Session is now ready for network streaming. */
698 session
->net_handle
= 1;
708 * Start a kernel session by opening all necessary streams.
710 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
713 struct ltt_kernel_channel
*kchan
;
715 /* Open kernel metadata */
716 if (ksess
->metadata
== NULL
&& ksess
->output_traces
) {
717 ret
= kernel_open_metadata(ksess
);
719 ret
= LTTNG_ERR_KERN_META_FAIL
;
724 /* Open kernel metadata stream */
725 if (ksess
->metadata
&& ksess
->metadata_stream_fd
< 0) {
726 ret
= kernel_open_metadata_stream(ksess
);
728 ERR("Kernel create metadata stream failed");
729 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
734 /* For each channel */
735 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
736 if (kchan
->stream_count
== 0) {
737 ret
= kernel_open_channel_stream(kchan
);
739 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
742 /* Update the stream global counter */
743 ksess
->stream_count_global
+= ret
;
747 /* Setup kernel consumer socket and send fds to it */
748 ret
= init_kernel_tracing(ksess
);
750 ret
= LTTNG_ERR_KERN_START_FAIL
;
754 /* This start the kernel tracing */
755 ret
= kernel_start_session(ksess
);
757 ret
= LTTNG_ERR_KERN_START_FAIL
;
761 /* Quiescent wait after starting trace */
762 kernel_wait_quiescent(kernel_tracer_fd
);
773 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
775 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
779 struct ltt_ust_session
*usess
;
781 usess
= session
->ust_session
;
786 case LTTNG_DOMAIN_KERNEL
:
788 ret
= channel_kernel_disable(session
->kernel_session
,
790 if (ret
!= LTTNG_OK
) {
794 kernel_wait_quiescent(kernel_tracer_fd
);
797 case LTTNG_DOMAIN_UST
:
799 struct ltt_ust_channel
*uchan
;
800 struct lttng_ht
*chan_ht
;
802 chan_ht
= usess
->domain_global
.channels
;
804 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
806 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
810 ret
= channel_ust_disable(usess
, uchan
);
811 if (ret
!= LTTNG_OK
) {
817 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
818 case LTTNG_DOMAIN_UST_EXEC_NAME
:
819 case LTTNG_DOMAIN_UST_PID
:
822 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
834 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
836 * The wpipe arguments is used as a notifier for the kernel thread.
838 int cmd_enable_channel(struct ltt_session
*session
,
839 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
842 struct ltt_ust_session
*usess
= session
->ust_session
;
843 struct lttng_ht
*chan_ht
;
849 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
854 * The ringbuffer (both in user space and kernel) behave badly in overwrite
855 * mode and with less than 2 subbuf so block it right away and send back an
856 * invalid attribute error.
858 if (attr
->attr
.overwrite
&& attr
->attr
.num_subbuf
< 2) {
859 ret
= LTTNG_ERR_INVALID
;
863 switch (domain
->type
) {
864 case LTTNG_DOMAIN_KERNEL
:
866 struct ltt_kernel_channel
*kchan
;
868 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
869 session
->kernel_session
);
872 * Don't try to create a channel if the session
873 * has been started at some point in time
874 * before. The tracer does not allow it.
876 if (session
->started
) {
877 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
880 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
881 if (attr
->name
[0] != '\0') {
882 session
->kernel_session
->has_non_default_channel
= 1;
885 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
888 if (ret
!= LTTNG_OK
) {
892 kernel_wait_quiescent(kernel_tracer_fd
);
895 case LTTNG_DOMAIN_UST
:
897 struct ltt_ust_channel
*uchan
;
899 chan_ht
= usess
->domain_global
.channels
;
901 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
904 * Don't try to create a channel if the session
905 * has been started at some point in time
906 * before. The tracer does not allow it.
908 if (session
->started
) {
909 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
912 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
913 if (attr
->name
[0] != '\0') {
914 usess
->has_non_default_channel
= 1;
917 ret
= channel_ust_enable(usess
, uchan
);
922 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
933 * Command LTTNG_DISABLE_EVENT processed by the client thread.
935 int cmd_disable_event(struct ltt_session
*session
, int domain
,
936 char *channel_name
, char *event_name
)
943 case LTTNG_DOMAIN_KERNEL
:
945 struct ltt_kernel_channel
*kchan
;
946 struct ltt_kernel_session
*ksess
;
948 ksess
= session
->kernel_session
;
951 * If a non-default channel has been created in the
952 * session, explicitely require that -c chan_name needs
955 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
956 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
960 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
962 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
966 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
967 if (ret
!= LTTNG_OK
) {
971 kernel_wait_quiescent(kernel_tracer_fd
);
974 case LTTNG_DOMAIN_UST
:
976 struct ltt_ust_channel
*uchan
;
977 struct ltt_ust_session
*usess
;
979 usess
= session
->ust_session
;
982 * If a non-default channel has been created in the
983 * session, explicitely require that -c chan_name needs
986 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
987 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
991 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
994 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
998 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
999 if (ret
!= LTTNG_OK
) {
1003 DBG3("Disable UST event %s in channel %s completed", event_name
,
1008 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1009 case LTTNG_DOMAIN_UST_PID
:
1010 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1013 ret
= LTTNG_ERR_UND
;
1025 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1027 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
1035 case LTTNG_DOMAIN_KERNEL
:
1037 struct ltt_kernel_session
*ksess
;
1038 struct ltt_kernel_channel
*kchan
;
1040 ksess
= session
->kernel_session
;
1043 * If a non-default channel has been created in the
1044 * session, explicitely require that -c chan_name needs
1047 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1048 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1052 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1053 if (kchan
== NULL
) {
1054 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1058 ret
= event_kernel_disable_all(kchan
);
1059 if (ret
!= LTTNG_OK
) {
1063 kernel_wait_quiescent(kernel_tracer_fd
);
1066 case LTTNG_DOMAIN_UST
:
1068 struct ltt_ust_session
*usess
;
1069 struct ltt_ust_channel
*uchan
;
1071 usess
= session
->ust_session
;
1074 * If a non-default channel has been created in the
1075 * session, explicitely require that -c chan_name needs
1078 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1079 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1083 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1085 if (uchan
== NULL
) {
1086 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1090 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1095 DBG3("Disable all UST events in channel %s completed", channel_name
);
1100 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1101 case LTTNG_DOMAIN_UST_PID
:
1102 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1105 ret
= LTTNG_ERR_UND
;
1117 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1119 int cmd_add_context(struct ltt_session
*session
, int domain
,
1120 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1122 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1125 case LTTNG_DOMAIN_KERNEL
:
1126 assert(session
->kernel_session
);
1128 if (session
->kernel_session
->channel_count
== 0) {
1129 /* Create default channel */
1130 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1131 if (ret
!= LTTNG_OK
) {
1134 chan_kern_created
= 1;
1136 /* Add kernel context to kernel tracer */
1137 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1138 if (ret
!= LTTNG_OK
) {
1142 case LTTNG_DOMAIN_UST
:
1144 struct ltt_ust_session
*usess
= session
->ust_session
;
1145 unsigned int chan_count
;
1149 chan_count
= lttng_ht_get_count(usess
->domain_global
.channels
);
1150 if (chan_count
== 0) {
1151 struct lttng_channel
*attr
;
1152 /* Create default channel */
1153 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1155 ret
= LTTNG_ERR_FATAL
;
1159 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1160 if (ret
!= LTTNG_OK
) {
1165 chan_ust_created
= 1;
1168 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1169 if (ret
!= LTTNG_OK
) {
1175 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1176 case LTTNG_DOMAIN_UST_PID
:
1177 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1180 ret
= LTTNG_ERR_UND
;
1187 if (chan_kern_created
) {
1188 struct ltt_kernel_channel
*kchan
=
1189 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1190 session
->kernel_session
);
1191 /* Created previously, this should NOT fail. */
1193 kernel_destroy_channel(kchan
);
1196 if (chan_ust_created
) {
1197 struct ltt_ust_channel
*uchan
=
1198 trace_ust_find_channel_by_name(
1199 session
->ust_session
->domain_global
.channels
,
1200 DEFAULT_CHANNEL_NAME
);
1201 /* Created previously, this should NOT fail. */
1203 /* Remove from the channel list of the session. */
1204 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1206 trace_ust_destroy_channel(uchan
);
1212 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1214 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1215 char *channel_name
, struct lttng_event
*event
,
1216 struct lttng_filter_bytecode
*filter
, int wpipe
)
1218 int ret
, channel_created
= 0;
1219 struct lttng_channel
*attr
;
1223 assert(channel_name
);
1227 switch (domain
->type
) {
1228 case LTTNG_DOMAIN_KERNEL
:
1230 struct ltt_kernel_channel
*kchan
;
1233 * If a non-default channel has been created in the
1234 * session, explicitely require that -c chan_name needs
1237 if (session
->kernel_session
->has_non_default_channel
1238 && channel_name
[0] == '\0') {
1239 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1243 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1244 session
->kernel_session
);
1245 if (kchan
== NULL
) {
1246 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1247 LTTNG_BUFFER_GLOBAL
);
1249 ret
= LTTNG_ERR_FATAL
;
1252 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1254 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1255 if (ret
!= LTTNG_OK
) {
1261 channel_created
= 1;
1264 /* Get the newly created kernel channel pointer */
1265 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1266 session
->kernel_session
);
1267 if (kchan
== NULL
) {
1268 /* This sould not happen... */
1269 ret
= LTTNG_ERR_FATAL
;
1273 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1274 if (ret
!= LTTNG_OK
) {
1275 if (channel_created
) {
1276 /* Let's not leak a useless channel. */
1277 kernel_destroy_channel(kchan
);
1282 kernel_wait_quiescent(kernel_tracer_fd
);
1285 case LTTNG_DOMAIN_UST
:
1287 struct ltt_ust_channel
*uchan
;
1288 struct ltt_ust_session
*usess
= session
->ust_session
;
1293 * If a non-default channel has been created in the
1294 * session, explicitely require that -c chan_name needs
1297 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1298 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1302 /* Get channel from global UST domain */
1303 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1305 if (uchan
== NULL
) {
1306 /* Create default channel */
1307 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1308 usess
->buffer_type
);
1310 ret
= LTTNG_ERR_FATAL
;
1313 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1315 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1316 if (ret
!= LTTNG_OK
) {
1322 /* Get the newly created channel reference back */
1323 uchan
= trace_ust_find_channel_by_name(
1324 usess
->domain_global
.channels
, channel_name
);
1328 /* At this point, the session and channel exist on the tracer */
1329 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
, filter
);
1330 if (ret
!= LTTNG_OK
) {
1336 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1337 case LTTNG_DOMAIN_UST_PID
:
1338 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1341 ret
= LTTNG_ERR_UND
;
1353 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1355 int cmd_enable_event_all(struct ltt_session
*session
,
1356 struct lttng_domain
*domain
, char *channel_name
, int event_type
,
1357 struct lttng_filter_bytecode
*filter
, int wpipe
)
1360 struct lttng_channel
*attr
;
1363 assert(channel_name
);
1367 switch (domain
->type
) {
1368 case LTTNG_DOMAIN_KERNEL
:
1370 struct ltt_kernel_channel
*kchan
;
1372 assert(session
->kernel_session
);
1375 * If a non-default channel has been created in the
1376 * session, explicitely require that -c chan_name needs
1379 if (session
->kernel_session
->has_non_default_channel
1380 && channel_name
[0] == '\0') {
1381 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1385 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1386 session
->kernel_session
);
1387 if (kchan
== NULL
) {
1388 /* Create default channel */
1389 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1390 LTTNG_BUFFER_GLOBAL
);
1392 ret
= LTTNG_ERR_FATAL
;
1395 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1397 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1398 if (ret
!= LTTNG_OK
) {
1404 /* Get the newly created kernel channel pointer */
1405 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1406 session
->kernel_session
);
1410 switch (event_type
) {
1411 case LTTNG_EVENT_SYSCALL
:
1412 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1414 case LTTNG_EVENT_TRACEPOINT
:
1416 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1417 * events already registered to the channel.
1419 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1421 case LTTNG_EVENT_ALL
:
1422 /* Enable syscalls and tracepoints */
1423 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1426 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1430 /* Manage return value */
1431 if (ret
!= LTTNG_OK
) {
1433 * On error, cmd_enable_channel call will take care of destroying
1434 * the created channel if it was needed.
1439 kernel_wait_quiescent(kernel_tracer_fd
);
1442 case LTTNG_DOMAIN_UST
:
1444 struct ltt_ust_channel
*uchan
;
1445 struct ltt_ust_session
*usess
= session
->ust_session
;
1450 * If a non-default channel has been created in the
1451 * session, explicitely require that -c chan_name needs
1454 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1455 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1459 /* Get channel from global UST domain */
1460 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1462 if (uchan
== NULL
) {
1463 /* Create default channel */
1464 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1465 usess
->buffer_type
);
1467 ret
= LTTNG_ERR_FATAL
;
1470 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1472 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1473 if (ret
!= LTTNG_OK
) {
1479 /* Get the newly created channel reference back */
1480 uchan
= trace_ust_find_channel_by_name(
1481 usess
->domain_global
.channels
, channel_name
);
1485 /* At this point, the session and channel exist on the tracer */
1487 switch (event_type
) {
1488 case LTTNG_EVENT_ALL
:
1489 case LTTNG_EVENT_TRACEPOINT
:
1490 ret
= event_ust_enable_all_tracepoints(usess
, uchan
, filter
);
1491 if (ret
!= LTTNG_OK
) {
1496 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1500 /* Manage return value */
1501 if (ret
!= LTTNG_OK
) {
1508 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1509 case LTTNG_DOMAIN_UST_PID
:
1510 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1513 ret
= LTTNG_ERR_UND
;
1526 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1528 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1531 ssize_t nb_events
= 0;
1534 case LTTNG_DOMAIN_KERNEL
:
1535 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1536 if (nb_events
< 0) {
1537 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1541 case LTTNG_DOMAIN_UST
:
1542 nb_events
= ust_app_list_events(events
);
1543 if (nb_events
< 0) {
1544 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1549 ret
= LTTNG_ERR_UND
;
1556 /* Return negative value to differentiate return code */
1561 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1563 ssize_t
cmd_list_tracepoint_fields(int domain
,
1564 struct lttng_event_field
**fields
)
1567 ssize_t nb_fields
= 0;
1570 case LTTNG_DOMAIN_UST
:
1571 nb_fields
= ust_app_list_event_fields(fields
);
1572 if (nb_fields
< 0) {
1573 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1577 case LTTNG_DOMAIN_KERNEL
:
1578 default: /* fall-through */
1579 ret
= LTTNG_ERR_UND
;
1586 /* Return negative value to differentiate return code */
1591 * Command LTTNG_START_TRACE processed by the client thread.
1593 int cmd_start_trace(struct ltt_session
*session
)
1596 unsigned long nb_chan
= 0;
1597 struct ltt_kernel_session
*ksession
;
1598 struct ltt_ust_session
*usess
;
1602 /* Ease our life a bit ;) */
1603 ksession
= session
->kernel_session
;
1604 usess
= session
->ust_session
;
1606 if (session
->enabled
) {
1607 /* Already started. */
1608 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1613 * Starting a session without channel is useless since after that it's not
1614 * possible to enable channel thus inform the client.
1616 if (usess
&& usess
->domain_global
.channels
) {
1617 nb_chan
+= lttng_ht_get_count(usess
->domain_global
.channels
);
1620 nb_chan
+= ksession
->channel_count
;
1623 ret
= LTTNG_ERR_NO_CHANNEL
;
1627 session
->enabled
= 1;
1629 /* Kernel tracing */
1630 if (ksession
!= NULL
) {
1631 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1632 if (ret
!= LTTNG_OK
) {
1637 /* Flag session that trace should start automatically */
1639 usess
->start_trace
= 1;
1641 ret
= ust_app_start_trace_all(usess
);
1643 ret
= LTTNG_ERR_UST_START_FAIL
;
1648 session
->started
= 1;
1657 * Command LTTNG_STOP_TRACE processed by the client thread.
1659 int cmd_stop_trace(struct ltt_session
*session
)
1662 struct ltt_kernel_channel
*kchan
;
1663 struct ltt_kernel_session
*ksession
;
1664 struct ltt_ust_session
*usess
;
1669 ksession
= session
->kernel_session
;
1670 usess
= session
->ust_session
;
1672 if (!session
->enabled
) {
1673 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1677 session
->enabled
= 0;
1680 if (ksession
&& ksession
->started
) {
1681 DBG("Stop kernel tracing");
1683 /* Flush metadata if exist */
1684 if (ksession
->metadata_stream_fd
>= 0) {
1685 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1687 ERR("Kernel metadata flush failed");
1691 /* Flush all buffers before stopping */
1692 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1693 ret
= kernel_flush_buffer(kchan
);
1695 ERR("Kernel flush buffer error");
1699 ret
= kernel_stop_session(ksession
);
1701 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1705 kernel_wait_quiescent(kernel_tracer_fd
);
1707 ksession
->started
= 0;
1710 if (usess
&& usess
->start_trace
) {
1711 usess
->start_trace
= 0;
1713 ret
= ust_app_stop_trace_all(usess
);
1715 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1727 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1729 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1730 size_t nb_uri
, struct lttng_uri
*uris
)
1733 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1734 struct ltt_ust_session
*usess
= session
->ust_session
;
1735 struct consumer_output
*consumer
= NULL
;
1741 /* Can't enable consumer after session started. */
1742 if (session
->enabled
) {
1743 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1748 * This case switch makes sure the domain session has a temporary consumer
1749 * so the URL can be set.
1753 /* Code flow error. A session MUST always have a consumer object */
1754 assert(session
->consumer
);
1756 * The URL will be added to the tracing session consumer instead of a
1757 * specific domain consumer.
1759 consumer
= session
->consumer
;
1761 case LTTNG_DOMAIN_KERNEL
:
1762 /* Code flow error if we don't have a kernel session here. */
1764 assert(ksess
->consumer
);
1765 consumer
= ksess
->consumer
;
1767 case LTTNG_DOMAIN_UST
:
1768 /* Code flow error if we don't have a kernel session here. */
1770 assert(usess
->consumer
);
1771 consumer
= usess
->consumer
;
1775 for (i
= 0; i
< nb_uri
; i
++) {
1776 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1777 if (ret
!= LTTNG_OK
) {
1790 * Command LTTNG_CREATE_SESSION processed by the client thread.
1792 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1793 size_t nb_uri
, lttng_sock_cred
*creds
)
1796 struct ltt_session
*session
;
1802 * Verify if the session already exist
1804 * XXX: There is no need for the session lock list here since the caller
1805 * (process_client_msg) is holding it. We might want to change that so a
1806 * single command does not lock the entire session list.
1808 session
= session_find_by_name(name
);
1809 if (session
!= NULL
) {
1810 ret
= LTTNG_ERR_EXIST_SESS
;
1814 /* Create tracing session in the registry */
1815 ret
= session_create(name
, LTTNG_SOCK_GET_UID_CRED(creds
),
1816 LTTNG_SOCK_GET_GID_CRED(creds
));
1817 if (ret
!= LTTNG_OK
) {
1822 * Get the newly created session pointer back
1824 * XXX: There is no need for the session lock list here since the caller
1825 * (process_client_msg) is holding it. We might want to change that so a
1826 * single command does not lock the entire session list.
1828 session
= session_find_by_name(name
);
1831 /* Create default consumer output for the session not yet created. */
1832 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1833 if (session
->consumer
== NULL
) {
1834 ret
= LTTNG_ERR_FATAL
;
1835 goto consumer_error
;
1839 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1840 if (ret
!= LTTNG_OK
) {
1841 goto consumer_error
;
1843 session
->output_traces
= 1;
1845 session
->output_traces
= 0;
1846 DBG2("Session %s created with no output", session
->name
);
1849 session
->consumer
->enabled
= 1;
1854 session_destroy(session
);
1861 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
1863 int cmd_create_session_snapshot(char *name
, struct lttng_uri
*uris
,
1864 size_t nb_uri
, lttng_sock_cred
*creds
)
1867 struct ltt_session
*session
;
1868 struct snapshot_output
*new_output
= NULL
;
1874 * Create session in no output mode with URIs set to NULL. The uris we've
1875 * received are for a default snapshot output if one.
1877 ret
= cmd_create_session_uri(name
, NULL
, 0, creds
);
1878 if (ret
!= LTTNG_OK
) {
1882 /* Get the newly created session pointer back. This should NEVER fail. */
1883 session
= session_find_by_name(name
);
1886 /* Flag session for snapshot mode. */
1887 session
->snapshot_mode
= 1;
1889 /* Skip snapshot output creation if no URI is given. */
1894 new_output
= snapshot_output_alloc();
1896 ret
= LTTNG_ERR_NOMEM
;
1897 goto error_snapshot_alloc
;
1900 ret
= snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE
, NULL
,
1901 uris
, nb_uri
, session
->consumer
, new_output
, &session
->snapshot
);
1903 if (ret
== -ENOMEM
) {
1904 ret
= LTTNG_ERR_NOMEM
;
1906 ret
= LTTNG_ERR_INVALID
;
1908 goto error_snapshot
;
1912 snapshot_add_output(&session
->snapshot
, new_output
);
1919 snapshot_output_destroy(new_output
);
1920 error_snapshot_alloc
:
1921 session_destroy(session
);
1927 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1929 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1932 struct ltt_ust_session
*usess
;
1933 struct ltt_kernel_session
*ksess
;
1938 usess
= session
->ust_session
;
1939 ksess
= session
->kernel_session
;
1941 /* Clean kernel session teardown */
1942 kernel_destroy_session(ksess
);
1944 /* UST session teardown */
1946 /* Close any relayd session */
1947 consumer_output_send_destroy_relayd(usess
->consumer
);
1949 /* Destroy every UST application related to this session. */
1950 ret
= ust_app_destroy_trace_all(usess
);
1952 ERR("Error in ust_app_destroy_trace_all");
1955 /* Clean up the rest. */
1956 trace_ust_destroy_session(usess
);
1960 * Must notify the kernel thread here to update it's poll set in order to
1961 * remove the channel(s)' fd just destroyed.
1963 ret
= notify_thread_pipe(wpipe
);
1965 PERROR("write kernel poll pipe");
1968 ret
= session_destroy(session
);
1974 * Command LTTNG_CALIBRATE processed by the client thread.
1976 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1981 case LTTNG_DOMAIN_KERNEL
:
1983 struct lttng_kernel_calibrate kcalibrate
;
1985 switch (calibrate
->type
) {
1986 case LTTNG_CALIBRATE_FUNCTION
:
1988 /* Default and only possible calibrate option. */
1989 kcalibrate
.type
= LTTNG_KERNEL_CALIBRATE_KRETPROBE
;
1993 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1995 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
2000 case LTTNG_DOMAIN_UST
:
2002 struct lttng_ust_calibrate ucalibrate
;
2004 switch (calibrate
->type
) {
2005 case LTTNG_CALIBRATE_FUNCTION
:
2007 /* Default and only possible calibrate option. */
2008 ucalibrate
.type
= LTTNG_UST_CALIBRATE_TRACEPOINT
;
2012 ret
= ust_app_calibrate_glb(&ucalibrate
);
2014 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
2020 ret
= LTTNG_ERR_UND
;
2031 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2033 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2034 const char *sock_path
, struct consumer_data
*cdata
)
2037 struct consumer_socket
*socket
= NULL
;
2044 case LTTNG_DOMAIN_KERNEL
:
2046 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2050 /* Can't register a consumer if there is already one */
2051 if (ksess
->consumer_fds_sent
!= 0) {
2052 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2056 sock
= lttcomm_connect_unix_sock(sock_path
);
2058 ret
= LTTNG_ERR_CONNECT_FAIL
;
2061 cdata
->cmd_sock
= sock
;
2063 socket
= consumer_allocate_socket(&cdata
->cmd_sock
);
2064 if (socket
== NULL
) {
2067 PERROR("close register consumer");
2069 cdata
->cmd_sock
= -1;
2070 ret
= LTTNG_ERR_FATAL
;
2074 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
2075 if (socket
->lock
== NULL
) {
2076 PERROR("zmalloc pthread mutex");
2077 ret
= LTTNG_ERR_FATAL
;
2080 pthread_mutex_init(socket
->lock
, NULL
);
2081 socket
->registered
= 1;
2084 consumer_add_socket(socket
, ksess
->consumer
);
2087 pthread_mutex_lock(&cdata
->pid_mutex
);
2089 pthread_mutex_unlock(&cdata
->pid_mutex
);
2094 /* TODO: Userspace tracing */
2095 ret
= LTTNG_ERR_UND
;
2103 consumer_destroy_socket(socket
);
2109 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2111 ssize_t
cmd_list_domains(struct ltt_session
*session
,
2112 struct lttng_domain
**domains
)
2117 if (session
->kernel_session
!= NULL
) {
2118 DBG3("Listing domains found kernel domain");
2122 if (session
->ust_session
!= NULL
) {
2123 DBG3("Listing domains found UST global domain");
2127 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2128 if (*domains
== NULL
) {
2129 ret
= LTTNG_ERR_FATAL
;
2133 if (session
->kernel_session
!= NULL
) {
2134 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2138 if (session
->ust_session
!= NULL
) {
2139 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2140 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2147 /* Return negative value to differentiate return code */
2153 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2155 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
2156 struct lttng_channel
**channels
)
2159 ssize_t nb_chan
= 0;
2162 case LTTNG_DOMAIN_KERNEL
:
2163 if (session
->kernel_session
!= NULL
) {
2164 nb_chan
= session
->kernel_session
->channel_count
;
2166 DBG3("Number of kernel channels %zd", nb_chan
);
2168 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2171 case LTTNG_DOMAIN_UST
:
2172 if (session
->ust_session
!= NULL
) {
2173 nb_chan
= lttng_ht_get_count(
2174 session
->ust_session
->domain_global
.channels
);
2176 DBG3("Number of UST global channels %zd", nb_chan
);
2178 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2183 ret
= LTTNG_ERR_UND
;
2188 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2189 if (*channels
== NULL
) {
2190 ret
= LTTNG_ERR_FATAL
;
2194 list_lttng_channels(domain
, session
, *channels
);
2197 /* Ret value was set in the domain switch case */
2204 /* Return negative value to differentiate return code */
2209 * Command LTTNG_LIST_EVENTS processed by the client thread.
2211 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2212 char *channel_name
, struct lttng_event
**events
)
2215 ssize_t nb_event
= 0;
2218 case LTTNG_DOMAIN_KERNEL
:
2219 if (session
->kernel_session
!= NULL
) {
2220 nb_event
= list_lttng_kernel_events(channel_name
,
2221 session
->kernel_session
, events
);
2224 case LTTNG_DOMAIN_UST
:
2226 if (session
->ust_session
!= NULL
) {
2227 nb_event
= list_lttng_ust_global_events(channel_name
,
2228 &session
->ust_session
->domain_global
, events
);
2233 ret
= LTTNG_ERR_UND
;
2240 /* Return negative value to differentiate return code */
2245 * Using the session list, filled a lttng_session array to send back to the
2246 * client for session listing.
2248 * The session list lock MUST be acquired before calling this function. Use
2249 * session_lock_list() and session_unlock_list().
2251 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2256 struct ltt_session
*session
;
2257 struct ltt_session_list
*list
= session_get_list();
2259 DBG("Getting all available session for UID %d GID %d",
2262 * Iterate over session list and append data after the control struct in
2265 cds_list_for_each_entry(session
, &list
->head
, list
) {
2267 * Only list the sessions the user can control.
2269 if (!session_access_ok(session
, uid
, gid
)) {
2273 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2274 struct ltt_ust_session
*usess
= session
->ust_session
;
2276 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2277 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2278 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2279 ret
= build_network_session_path(sessions
[i
].path
,
2280 sizeof(sessions
[i
].path
), session
);
2282 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
2283 session
->consumer
->dst
.trace_path
);
2286 PERROR("snprintf session path");
2290 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2291 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2292 sessions
[i
].enabled
= session
->enabled
;
2293 sessions
[i
].snapshot_mode
= session
->snapshot_mode
;
2299 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2300 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2302 int cmd_data_pending(struct ltt_session
*session
)
2305 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2306 struct ltt_ust_session
*usess
= session
->ust_session
;
2310 /* Session MUST be stopped to ask for data availability. */
2311 if (session
->enabled
) {
2312 ret
= LTTNG_ERR_SESSION_STARTED
;
2316 * If stopped, just make sure we've started before else the above call
2317 * will always send that there is data pending.
2319 * The consumer assumes that when the data pending command is received,
2320 * the trace has been started before or else no output data is written
2321 * by the streams which is a condition for data pending. So, this is
2322 * *VERY* important that we don't ask the consumer before a start
2325 if (!session
->started
) {
2331 if (ksess
&& ksess
->consumer
) {
2332 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2334 /* Data is still being extracted for the kernel. */
2339 if (usess
&& usess
->consumer
) {
2340 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2342 /* Data is still being extracted for the kernel. */
2347 /* Data is ready to be read by a viewer */
2355 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2357 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2359 int cmd_snapshot_add_output(struct ltt_session
*session
,
2360 struct lttng_snapshot_output
*output
, uint32_t *id
)
2363 struct snapshot_output
*new_output
;
2368 DBG("Cmd snapshot add output for session %s", session
->name
);
2371 * Permission denied to create an output if the session is not
2372 * set in no output mode.
2374 if (session
->output_traces
) {
2375 ret
= LTTNG_ERR_EPERM
;
2379 /* Only one output is allowed until we have the "tee" feature. */
2380 if (session
->snapshot
.nb_output
== 1) {
2381 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
2385 new_output
= snapshot_output_alloc();
2387 ret
= LTTNG_ERR_NOMEM
;
2391 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2392 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
2393 &session
->snapshot
);
2395 if (ret
== -ENOMEM
) {
2396 ret
= LTTNG_ERR_NOMEM
;
2398 ret
= LTTNG_ERR_INVALID
;
2404 snapshot_add_output(&session
->snapshot
, new_output
);
2406 *id
= new_output
->id
;
2413 snapshot_output_destroy(new_output
);
2419 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2421 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2423 int cmd_snapshot_del_output(struct ltt_session
*session
,
2424 struct lttng_snapshot_output
*output
)
2427 struct snapshot_output
*sout
= NULL
;
2435 * Permission denied to create an output if the session is not
2436 * set in no output mode.
2438 if (session
->output_traces
) {
2439 ret
= LTTNG_ERR_EPERM
;
2444 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
2446 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
2447 } else if (*output
->name
!= '\0') {
2448 DBG("Cmd snapshot del output name %s for session %s", output
->name
,
2450 sout
= snapshot_find_output_by_name(output
->name
, &session
->snapshot
);
2453 ret
= LTTNG_ERR_INVALID
;
2457 snapshot_delete_output(&session
->snapshot
, sout
);
2458 snapshot_output_destroy(sout
);
2467 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2469 * If no output is available, outputs is untouched and 0 is returned.
2471 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2473 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
2474 struct lttng_snapshot_output
**outputs
)
2477 struct lttng_snapshot_output
*list
;
2478 struct lttng_ht_iter iter
;
2479 struct snapshot_output
*output
;
2484 DBG("Cmd snapshot list outputs for session %s", session
->name
);
2487 * Permission denied to create an output if the session is not
2488 * set in no output mode.
2490 if (session
->output_traces
) {
2491 ret
= LTTNG_ERR_EPERM
;
2495 if (session
->snapshot
.nb_output
== 0) {
2500 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
2502 ret
= LTTNG_ERR_NOMEM
;
2506 /* Copy list from session to the new list object. */
2507 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
2508 output
, node
.node
) {
2509 assert(output
->consumer
);
2510 list
[idx
].id
= output
->id
;
2511 list
[idx
].max_size
= output
->max_size
;
2512 strncpy(list
[idx
].name
, output
->name
, sizeof(list
[idx
].name
));
2513 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
2514 strncpy(list
[idx
].ctrl_url
, output
->consumer
->dst
.trace_path
,
2515 sizeof(list
[idx
].ctrl_url
));
2518 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
2519 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
2521 ret
= LTTNG_ERR_NOMEM
;
2526 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
2527 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
2529 ret
= LTTNG_ERR_NOMEM
;
2537 return session
->snapshot
.nb_output
;
2546 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2547 * snapshot output is *not* set with a remote destination.
2549 * Return 0 on success or a LTTNG_ERR code.
2551 static int set_relayd_for_snapshot(struct consumer_output
*consumer
,
2552 struct snapshot_output
*snap_output
, struct ltt_session
*session
)
2555 struct lttng_ht_iter iter
;
2556 struct consumer_socket
*socket
;
2559 assert(snap_output
);
2562 DBG2("Set relayd object from snapshot output");
2564 /* Ignore if snapshot consumer output is not network. */
2565 if (snap_output
->consumer
->type
!= CONSUMER_DST_NET
) {
2570 * For each consumer socket, create and send the relayd object of the
2574 cds_lfht_for_each_entry(snap_output
->consumer
->socks
->ht
, &iter
.iter
,
2575 socket
, node
.node
) {
2576 ret
= send_consumer_relayd_sockets(0, session
->id
,
2577 snap_output
->consumer
, socket
);
2578 if (ret
!= LTTNG_OK
) {
2590 * Record a kernel snapshot.
2592 * Return 0 on success or a LTTNG_ERR code.
2594 static int record_kernel_snapshot(struct ltt_kernel_session
*ksess
,
2595 struct snapshot_output
*output
, struct ltt_session
*session
,
2596 int wait
, int nb_streams
)
2604 /* Get the datetime for the snapshot output directory. */
2605 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
2606 sizeof(output
->datetime
));
2608 ret
= LTTNG_ERR_INVALID
;
2613 * Copy kernel session sockets so we can communicate with the right
2614 * consumer for the snapshot record command.
2616 ret
= consumer_copy_sockets(output
->consumer
, ksess
->consumer
);
2618 ret
= LTTNG_ERR_NOMEM
;
2622 ret
= set_relayd_for_snapshot(ksess
->consumer
, output
, session
);
2623 if (ret
!= LTTNG_OK
) {
2624 goto error_snapshot
;
2627 ret
= kernel_snapshot_record(ksess
, output
, wait
, nb_streams
);
2628 if (ret
!= LTTNG_OK
) {
2629 goto error_snapshot
;
2635 /* Clean up copied sockets so this output can use some other later on. */
2636 consumer_destroy_output_sockets(output
->consumer
);
2642 * Record a UST snapshot.
2644 * Return 0 on success or a LTTNG_ERR error code.
2646 static int record_ust_snapshot(struct ltt_ust_session
*usess
,
2647 struct snapshot_output
*output
, struct ltt_session
*session
,
2648 int wait
, int nb_streams
)
2656 /* Get the datetime for the snapshot output directory. */
2657 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
2658 sizeof(output
->datetime
));
2660 ret
= LTTNG_ERR_INVALID
;
2665 * Copy UST session sockets so we can communicate with the right
2666 * consumer for the snapshot record command.
2668 ret
= consumer_copy_sockets(output
->consumer
, usess
->consumer
);
2670 ret
= LTTNG_ERR_NOMEM
;
2674 ret
= set_relayd_for_snapshot(usess
->consumer
, output
, session
);
2675 if (ret
!= LTTNG_OK
) {
2676 goto error_snapshot
;
2679 ret
= ust_app_snapshot_record(usess
, output
, wait
, nb_streams
);
2683 ret
= LTTNG_ERR_INVALID
;
2686 ret
= LTTNG_ERR_SNAPSHOT_NODATA
;
2689 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
2692 goto error_snapshot
;
2698 /* Clean up copied sockets so this output can use some other later on. */
2699 consumer_destroy_output_sockets(output
->consumer
);
2705 * Returns the total number of streams for a session or a negative value
2708 static unsigned int get_total_nb_stream(struct ltt_session
*session
)
2710 unsigned int total_streams
= 0;
2712 if (session
->kernel_session
) {
2713 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2715 total_streams
+= ksess
->stream_count_global
;
2718 if (session
->ust_session
) {
2719 struct ltt_ust_session
*usess
= session
->ust_session
;
2721 total_streams
+= ust_app_get_nb_stream(usess
);
2724 return total_streams
;
2728 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2730 * The wait parameter is ignored so this call always wait for the snapshot to
2731 * complete before returning.
2733 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2735 int cmd_snapshot_record(struct ltt_session
*session
,
2736 struct lttng_snapshot_output
*output
, int wait
)
2739 unsigned int use_tmp_output
= 0;
2740 struct snapshot_output tmp_output
;
2741 unsigned int nb_streams
, snapshot_success
= 0;
2745 DBG("Cmd snapshot record for session %s", session
->name
);
2748 * Permission denied to create an output if the session is not
2749 * set in no output mode.
2751 if (session
->output_traces
) {
2752 ret
= LTTNG_ERR_EPERM
;
2756 /* The session needs to be started at least once. */
2757 if (!session
->started
) {
2758 ret
= LTTNG_ERR_START_SESSION_ONCE
;
2762 /* Use temporary output for the session. */
2763 if (output
&& *output
->ctrl_url
!= '\0') {
2764 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2765 output
->ctrl_url
, output
->data_url
, session
->consumer
,
2768 if (ret
== -ENOMEM
) {
2769 ret
= LTTNG_ERR_NOMEM
;
2771 ret
= LTTNG_ERR_INVALID
;
2775 /* Use the global session count for the temporary snapshot. */
2776 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
2781 * Get the total number of stream of that session which is used by the
2782 * maximum size of the snapshot feature.
2784 nb_streams
= get_total_nb_stream(session
);
2786 if (session
->kernel_session
) {
2787 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2789 if (use_tmp_output
) {
2790 ret
= record_kernel_snapshot(ksess
, &tmp_output
, session
,
2792 if (ret
!= LTTNG_OK
) {
2795 snapshot_success
= 1;
2797 struct snapshot_output
*sout
;
2798 struct lttng_ht_iter iter
;
2801 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
2802 &iter
.iter
, sout
, node
.node
) {
2804 * Make a local copy of the output and assign the possible
2805 * temporary value given by the caller.
2807 memset(&tmp_output
, 0, sizeof(tmp_output
));
2808 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
2810 /* Use temporary max size. */
2811 if (output
->max_size
!= (uint64_t) -1ULL) {
2812 tmp_output
.max_size
= output
->max_size
;
2815 /* Use temporary name. */
2816 if (*output
->name
!= '\0') {
2817 strncpy(tmp_output
.name
, output
->name
,
2818 sizeof(tmp_output
.name
));
2821 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
2823 ret
= record_kernel_snapshot(ksess
, &tmp_output
,
2824 session
, wait
, nb_streams
);
2825 if (ret
!= LTTNG_OK
) {
2829 snapshot_success
= 1;
2835 if (session
->ust_session
) {
2836 struct ltt_ust_session
*usess
= session
->ust_session
;
2838 if (use_tmp_output
) {
2839 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
2841 if (ret
!= LTTNG_OK
) {
2844 snapshot_success
= 1;
2846 struct snapshot_output
*sout
;
2847 struct lttng_ht_iter iter
;
2850 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
2851 &iter
.iter
, sout
, node
.node
) {
2853 * Make a local copy of the output and assign the possible
2854 * temporary value given by the caller.
2856 memset(&tmp_output
, 0, sizeof(tmp_output
));
2857 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
2859 /* Use temporary max size. */
2860 if (output
->max_size
!= (uint64_t) -1ULL) {
2861 tmp_output
.max_size
= output
->max_size
;
2864 /* Use temporary name. */
2865 if (*output
->name
!= '\0') {
2866 strncpy(tmp_output
.name
, output
->name
,
2867 sizeof(tmp_output
.name
));
2870 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
2872 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
2874 if (ret
!= LTTNG_OK
) {
2878 snapshot_success
= 1;
2884 if (snapshot_success
) {
2885 session
->snapshot
.nb_snapshot
++;
2887 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
2895 * Init command subsystem.
2900 * Set network sequence index to 1 for streams to match a relayd
2901 * socket on the consumer side.
2903 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
2904 relayd_net_seq_idx
= 1;
2905 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
2907 DBG("Command subsystem initialized");