2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 #include <urcu/list.h>
22 #include <urcu/uatomic.h>
24 #include <common/defaults.h>
25 #include <common/common.h>
26 #include <common/sessiond-comm/sessiond-comm.h>
27 #include <common/relayd/relayd.h>
28 #include <common/utils.h>
35 #include "kernel-consumer.h"
36 #include "lttng-sessiond.h"
42 * Used to keep a unique index for each relayd socket created where this value
43 * is associated with streams on the consumer so it can match the right relayd
44 * to send to. It must be accessed with the relayd_net_seq_idx_lock
47 static pthread_mutex_t relayd_net_seq_idx_lock
= PTHREAD_MUTEX_INITIALIZER
;
48 static uint64_t relayd_net_seq_idx
;
51 * Create a session path used by list_lttng_sessions for the case that the
52 * session consumer is on the network.
54 static int build_network_session_path(char *dst
, size_t size
,
55 struct ltt_session
*session
)
57 int ret
, kdata_port
, udata_port
;
58 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
59 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
64 memset(tmp_urls
, 0, sizeof(tmp_urls
));
65 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
67 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
69 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
70 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
71 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
74 if (session
->ust_session
&& session
->ust_session
->consumer
) {
75 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
76 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
79 if (uuri
== NULL
&& kuri
== NULL
) {
80 uri
= &session
->consumer
->dst
.net
.control
;
81 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
82 } else if (kuri
&& uuri
) {
83 ret
= uri_compare(kuri
, uuri
);
87 /* Build uuri URL string */
88 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
95 } else if (kuri
&& uuri
== NULL
) {
97 } else if (uuri
&& kuri
== NULL
) {
101 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
107 * Do we have a UST url set. If yes, this means we have both kernel and UST
110 if (*tmp_uurl
!= '\0') {
111 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
112 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
115 if (kuri
|| (!kuri
&& !uuri
)) {
118 /* No kernel URI, use the UST port. */
121 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, dport
);
129 * Fill lttng_channel array of all channels.
131 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
132 struct lttng_channel
*channels
)
135 struct ltt_kernel_channel
*kchan
;
137 DBG("Listing channels for session %s", session
->name
);
140 case LTTNG_DOMAIN_KERNEL
:
141 /* Kernel channels */
142 if (session
->kernel_session
!= NULL
) {
143 cds_list_for_each_entry(kchan
,
144 &session
->kernel_session
->channel_list
.head
, list
) {
145 /* Copy lttng_channel struct to array */
146 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
147 channels
[i
].enabled
= kchan
->enabled
;
152 case LTTNG_DOMAIN_UST
:
154 struct lttng_ht_iter iter
;
155 struct ltt_ust_channel
*uchan
;
158 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
159 &iter
.iter
, uchan
, node
.node
) {
160 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
161 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
162 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
163 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
164 channels
[i
].attr
.switch_timer_interval
=
165 uchan
->attr
.switch_timer_interval
;
166 channels
[i
].attr
.read_timer_interval
=
167 uchan
->attr
.read_timer_interval
;
168 channels
[i
].enabled
= uchan
->enabled
;
169 switch (uchan
->attr
.output
) {
172 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
186 * Create a list of ust global domain events.
188 static int list_lttng_ust_global_events(char *channel_name
,
189 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
192 unsigned int nb_event
= 0;
193 struct lttng_ht_iter iter
;
194 struct lttng_ht_node_str
*node
;
195 struct ltt_ust_channel
*uchan
;
196 struct ltt_ust_event
*uevent
;
197 struct lttng_event
*tmp
;
199 DBG("Listing UST global events for channel %s", channel_name
);
203 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
204 node
= lttng_ht_iter_get_node_str(&iter
);
206 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
210 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
212 nb_event
+= lttng_ht_get_count(uchan
->events
);
219 DBG3("Listing UST global %d events", nb_event
);
221 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
223 ret
= LTTNG_ERR_FATAL
;
227 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
228 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
229 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
230 tmp
[i
].enabled
= uevent
->enabled
;
232 switch (uevent
->attr
.instrumentation
) {
233 case LTTNG_UST_TRACEPOINT
:
234 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
236 case LTTNG_UST_PROBE
:
237 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
239 case LTTNG_UST_FUNCTION
:
240 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
244 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
245 switch (uevent
->attr
.loglevel_type
) {
246 case LTTNG_UST_LOGLEVEL_ALL
:
247 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
249 case LTTNG_UST_LOGLEVEL_RANGE
:
250 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
252 case LTTNG_UST_LOGLEVEL_SINGLE
:
253 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
256 if (uevent
->filter
) {
271 * Fill lttng_event array of all kernel events in the channel.
273 static int list_lttng_kernel_events(char *channel_name
,
274 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
277 unsigned int nb_event
;
278 struct ltt_kernel_event
*event
;
279 struct ltt_kernel_channel
*kchan
;
281 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
283 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
287 nb_event
= kchan
->event_count
;
289 DBG("Listing events for channel %s", kchan
->channel
->name
);
295 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
296 if (*events
== NULL
) {
297 ret
= LTTNG_ERR_FATAL
;
301 /* Kernel channels */
302 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
303 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
304 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
305 (*events
)[i
].enabled
= event
->enabled
;
307 switch (event
->event
->instrumentation
) {
308 case LTTNG_KERNEL_TRACEPOINT
:
309 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
311 case LTTNG_KERNEL_KRETPROBE
:
312 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
313 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
314 sizeof(struct lttng_kernel_kprobe
));
316 case LTTNG_KERNEL_KPROBE
:
317 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
318 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
319 sizeof(struct lttng_kernel_kprobe
));
321 case LTTNG_KERNEL_FUNCTION
:
322 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
323 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
324 sizeof(struct lttng_kernel_function
));
326 case LTTNG_KERNEL_NOOP
:
327 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
329 case LTTNG_KERNEL_SYSCALL
:
330 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
332 case LTTNG_KERNEL_ALL
:
343 /* Negate the error code to differentiate the size from an error */
348 * Add URI so the consumer output object. Set the correct path depending on the
349 * domain adding the default trace directory.
351 static int add_uri_to_consumer(struct consumer_output
*consumer
,
352 struct lttng_uri
*uri
, int domain
, const char *session_name
)
355 const char *default_trace_dir
;
359 if (consumer
== NULL
) {
360 DBG("No consumer detected. Don't add URI. Stopping.");
361 ret
= LTTNG_ERR_NO_CONSUMER
;
366 case LTTNG_DOMAIN_KERNEL
:
367 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
369 case LTTNG_DOMAIN_UST
:
370 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
374 * This case is possible is we try to add the URI to the global tracing
375 * session consumer object which in this case there is no subdir.
377 default_trace_dir
= "";
380 switch (uri
->dtype
) {
383 DBG2("Setting network URI to consumer");
385 if (consumer
->type
== CONSUMER_DST_NET
) {
386 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
387 consumer
->dst
.net
.control_isset
) ||
388 (uri
->stype
== LTTNG_STREAM_DATA
&&
389 consumer
->dst
.net
.data_isset
)) {
390 ret
= LTTNG_ERR_URL_EXIST
;
394 memset(&consumer
->dst
.net
, 0, sizeof(consumer
->dst
.net
));
397 consumer
->type
= CONSUMER_DST_NET
;
399 /* Set URI into consumer output object */
400 ret
= consumer_set_network_uri(consumer
, uri
);
404 } else if (ret
== 1) {
406 * URI was the same in the consumer so we do not append the subdir
407 * again so to not duplicate output dir.
412 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
413 ret
= consumer_set_subdir(consumer
, session_name
);
415 ret
= LTTNG_ERR_FATAL
;
420 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
421 /* On a new subdir, reappend the default trace dir. */
422 strncat(consumer
->subdir
, default_trace_dir
,
423 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
424 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
429 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
430 memset(consumer
->dst
.trace_path
, 0,
431 sizeof(consumer
->dst
.trace_path
));
432 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
433 sizeof(consumer
->dst
.trace_path
));
434 /* Append default trace dir */
435 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
436 sizeof(consumer
->dst
.trace_path
) -
437 strlen(consumer
->dst
.trace_path
) - 1);
438 /* Flag consumer as local. */
439 consumer
->type
= CONSUMER_DST_LOCAL
;
450 * Init tracing by creating trace directory and sending fds kernel consumer.
452 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
455 struct lttng_ht_iter iter
;
456 struct consumer_socket
*socket
;
462 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
463 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
465 pthread_mutex_lock(socket
->lock
);
466 ret
= kernel_consumer_send_session(socket
, session
);
467 pthread_mutex_unlock(socket
->lock
);
469 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
481 * Create a socket to the relayd using the URI.
483 * On success, the relayd_sock pointer is set to the created socket.
484 * Else, it's stays untouched and a lttcomm error code is returned.
486 static int create_connect_relayd(struct lttng_uri
*uri
,
487 struct lttcomm_relayd_sock
**relayd_sock
)
490 struct lttcomm_relayd_sock
*rsock
;
492 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
493 RELAYD_VERSION_COMM_MINOR
);
495 ret
= LTTNG_ERR_FATAL
;
500 * Connect to relayd so we can proceed with a session creation. This call
501 * can possibly block for an arbitrary amount of time to set the health
502 * state to be in poll execution.
505 ret
= relayd_connect(rsock
);
508 ERR("Unable to reach lttng-relayd");
509 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
513 /* Create socket for control stream. */
514 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
515 DBG3("Creating relayd stream socket from URI");
517 /* Check relayd version */
518 ret
= relayd_version_check(rsock
);
520 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
523 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
524 DBG3("Creating relayd data socket from URI");
526 /* Command is not valid */
527 ERR("Relayd invalid stream type: %d", uri
->stype
);
528 ret
= LTTNG_ERR_INVALID
;
532 *relayd_sock
= rsock
;
537 /* The returned value is not useful since we are on an error path. */
538 (void) relayd_close(rsock
);
546 * Connect to the relayd using URI and send the socket to the right consumer.
548 static int send_consumer_relayd_socket(int domain
, unsigned int session_id
,
549 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
550 struct consumer_socket
*consumer_sock
)
553 struct lttcomm_relayd_sock
*rsock
= NULL
;
555 /* Connect to relayd and make version check if uri is the control. */
556 ret
= create_connect_relayd(relayd_uri
, &rsock
);
557 if (ret
!= LTTNG_OK
) {
562 /* Set the network sequence index if not set. */
563 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
564 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
566 * Increment net_seq_idx because we are about to transfer the
567 * new relayd socket to the consumer.
568 * Assign unique key so the consumer can match streams.
570 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
571 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
574 /* Send relayd socket to consumer. */
575 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
576 relayd_uri
->stype
, session_id
);
578 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
582 /* Flag that the corresponding socket was sent. */
583 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
584 consumer_sock
->control_sock_sent
= 1;
585 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
586 consumer_sock
->data_sock_sent
= 1;
592 * Close socket which was dup on the consumer side. The session daemon does
593 * NOT keep track of the relayd socket(s) once transfer to the consumer.
597 (void) relayd_close(rsock
);
601 if (ret
!= LTTNG_OK
) {
603 * The consumer output for this session should not be used anymore
604 * since the relayd connection failed thus making any tracing or/and
605 * streaming not usable.
607 consumer
->enabled
= 0;
613 * Send both relayd sockets to a specific consumer and domain. This is a
614 * helper function to facilitate sending the information to the consumer for a
617 static int send_consumer_relayd_sockets(int domain
, unsigned int session_id
,
618 struct consumer_output
*consumer
, struct consumer_socket
*sock
)
625 /* Sending control relayd socket. */
626 if (!sock
->control_sock_sent
) {
627 ret
= send_consumer_relayd_socket(domain
, session_id
,
628 &consumer
->dst
.net
.control
, consumer
, sock
);
629 if (ret
!= LTTNG_OK
) {
634 /* Sending data relayd socket. */
635 if (!sock
->data_sock_sent
) {
636 ret
= send_consumer_relayd_socket(domain
, session_id
,
637 &consumer
->dst
.net
.data
, consumer
, sock
);
638 if (ret
!= LTTNG_OK
) {
648 * Setup relayd connections for a tracing session. First creates the socket to
649 * the relayd and send them to the right domain consumer. Consumer type MUST be
652 int cmd_setup_relayd(struct ltt_session
*session
)
655 struct ltt_ust_session
*usess
;
656 struct ltt_kernel_session
*ksess
;
657 struct consumer_socket
*socket
;
658 struct lttng_ht_iter iter
;
662 usess
= session
->ust_session
;
663 ksess
= session
->kernel_session
;
665 DBG("Setting relayd for session %s", session
->name
);
669 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
670 && usess
->consumer
->enabled
) {
671 /* For each consumer socket, send relayd sockets */
672 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
674 pthread_mutex_lock(socket
->lock
);
675 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
->id
,
676 usess
->consumer
, socket
);
677 pthread_mutex_unlock(socket
->lock
);
678 if (ret
!= LTTNG_OK
) {
681 /* Session is now ready for network streaming. */
682 session
->net_handle
= 1;
686 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
687 && ksess
->consumer
->enabled
) {
688 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
690 pthread_mutex_lock(socket
->lock
);
691 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
->id
,
692 ksess
->consumer
, socket
);
693 pthread_mutex_unlock(socket
->lock
);
694 if (ret
!= LTTNG_OK
) {
697 /* Session is now ready for network streaming. */
698 session
->net_handle
= 1;
708 * Start a kernel session by opening all necessary streams.
710 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
713 struct ltt_kernel_channel
*kchan
;
715 /* Open kernel metadata */
716 if (ksess
->metadata
== NULL
&& ksess
->output_traces
) {
717 ret
= kernel_open_metadata(ksess
);
719 ret
= LTTNG_ERR_KERN_META_FAIL
;
724 /* Open kernel metadata stream */
725 if (ksess
->metadata
&& ksess
->metadata_stream_fd
< 0) {
726 ret
= kernel_open_metadata_stream(ksess
);
728 ERR("Kernel create metadata stream failed");
729 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
734 /* For each channel */
735 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
736 if (kchan
->stream_count
== 0) {
737 ret
= kernel_open_channel_stream(kchan
);
739 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
742 /* Update the stream global counter */
743 ksess
->stream_count_global
+= ret
;
747 /* Setup kernel consumer socket and send fds to it */
748 ret
= init_kernel_tracing(ksess
);
750 ret
= LTTNG_ERR_KERN_START_FAIL
;
754 /* This start the kernel tracing */
755 ret
= kernel_start_session(ksess
);
757 ret
= LTTNG_ERR_KERN_START_FAIL
;
761 /* Quiescent wait after starting trace */
762 kernel_wait_quiescent(kernel_tracer_fd
);
773 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
775 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
779 struct ltt_ust_session
*usess
;
781 usess
= session
->ust_session
;
786 case LTTNG_DOMAIN_KERNEL
:
788 ret
= channel_kernel_disable(session
->kernel_session
,
790 if (ret
!= LTTNG_OK
) {
794 kernel_wait_quiescent(kernel_tracer_fd
);
797 case LTTNG_DOMAIN_UST
:
799 struct ltt_ust_channel
*uchan
;
800 struct lttng_ht
*chan_ht
;
802 chan_ht
= usess
->domain_global
.channels
;
804 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
806 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
810 ret
= channel_ust_disable(usess
, uchan
);
811 if (ret
!= LTTNG_OK
) {
817 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
818 case LTTNG_DOMAIN_UST_EXEC_NAME
:
819 case LTTNG_DOMAIN_UST_PID
:
822 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
834 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
836 * The wpipe arguments is used as a notifier for the kernel thread.
838 int cmd_enable_channel(struct ltt_session
*session
,
839 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
842 struct ltt_ust_session
*usess
= session
->ust_session
;
843 struct lttng_ht
*chan_ht
;
849 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
854 * Don't try to enable a channel if the session has been started at
855 * some point in time before. The tracer does not allow it.
857 if (session
->has_been_started
) {
858 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
863 * The ringbuffer (both in user space and kernel) behave badly in overwrite
864 * mode and with less than 2 subbuf so block it right away and send back an
865 * invalid attribute error.
867 if (attr
->attr
.overwrite
&& attr
->attr
.num_subbuf
< 2) {
868 ret
= LTTNG_ERR_INVALID
;
872 switch (domain
->type
) {
873 case LTTNG_DOMAIN_KERNEL
:
875 struct ltt_kernel_channel
*kchan
;
877 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
878 session
->kernel_session
);
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
);
903 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
904 if (attr
->name
[0] != '\0') {
905 usess
->has_non_default_channel
= 1;
908 ret
= channel_ust_enable(usess
, uchan
);
913 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
924 * Command LTTNG_DISABLE_EVENT processed by the client thread.
926 int cmd_disable_event(struct ltt_session
*session
, int domain
,
927 char *channel_name
, char *event_name
)
934 case LTTNG_DOMAIN_KERNEL
:
936 struct ltt_kernel_channel
*kchan
;
937 struct ltt_kernel_session
*ksess
;
939 ksess
= session
->kernel_session
;
942 * If a non-default channel has been created in the
943 * session, explicitely require that -c chan_name needs
946 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
947 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
951 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
953 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
957 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
958 if (ret
!= LTTNG_OK
) {
962 kernel_wait_quiescent(kernel_tracer_fd
);
965 case LTTNG_DOMAIN_UST
:
967 struct ltt_ust_channel
*uchan
;
968 struct ltt_ust_session
*usess
;
970 usess
= session
->ust_session
;
973 * If a non-default channel has been created in the
974 * session, explicitely require that -c chan_name needs
977 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
978 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
982 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
985 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
989 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
990 if (ret
!= LTTNG_OK
) {
994 DBG3("Disable UST event %s in channel %s completed", event_name
,
999 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1000 case LTTNG_DOMAIN_UST_PID
:
1001 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1004 ret
= LTTNG_ERR_UND
;
1016 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1018 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
1026 case LTTNG_DOMAIN_KERNEL
:
1028 struct ltt_kernel_session
*ksess
;
1029 struct ltt_kernel_channel
*kchan
;
1031 ksess
= session
->kernel_session
;
1034 * If a non-default channel has been created in the
1035 * session, explicitely require that -c chan_name needs
1038 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1039 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1043 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1044 if (kchan
== NULL
) {
1045 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1049 ret
= event_kernel_disable_all(kchan
);
1050 if (ret
!= LTTNG_OK
) {
1054 kernel_wait_quiescent(kernel_tracer_fd
);
1057 case LTTNG_DOMAIN_UST
:
1059 struct ltt_ust_session
*usess
;
1060 struct ltt_ust_channel
*uchan
;
1062 usess
= session
->ust_session
;
1065 * If a non-default channel has been created in the
1066 * session, explicitely require that -c chan_name needs
1069 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1070 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1074 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1076 if (uchan
== NULL
) {
1077 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1081 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1086 DBG3("Disable all UST events in channel %s completed", channel_name
);
1091 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1092 case LTTNG_DOMAIN_UST_PID
:
1093 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1096 ret
= LTTNG_ERR_UND
;
1108 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1110 int cmd_add_context(struct ltt_session
*session
, int domain
,
1111 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1113 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1116 case LTTNG_DOMAIN_KERNEL
:
1117 assert(session
->kernel_session
);
1119 if (session
->kernel_session
->channel_count
== 0) {
1120 /* Create default channel */
1121 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1122 if (ret
!= LTTNG_OK
) {
1125 chan_kern_created
= 1;
1127 /* Add kernel context to kernel tracer */
1128 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1129 if (ret
!= LTTNG_OK
) {
1133 case LTTNG_DOMAIN_UST
:
1135 struct ltt_ust_session
*usess
= session
->ust_session
;
1136 unsigned int chan_count
;
1140 chan_count
= lttng_ht_get_count(usess
->domain_global
.channels
);
1141 if (chan_count
== 0) {
1142 struct lttng_channel
*attr
;
1143 /* Create default channel */
1144 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1146 ret
= LTTNG_ERR_FATAL
;
1150 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1151 if (ret
!= LTTNG_OK
) {
1156 chan_ust_created
= 1;
1159 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1160 if (ret
!= LTTNG_OK
) {
1166 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1167 case LTTNG_DOMAIN_UST_PID
:
1168 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1171 ret
= LTTNG_ERR_UND
;
1178 if (chan_kern_created
) {
1179 struct ltt_kernel_channel
*kchan
=
1180 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1181 session
->kernel_session
);
1182 /* Created previously, this should NOT fail. */
1184 kernel_destroy_channel(kchan
);
1187 if (chan_ust_created
) {
1188 struct ltt_ust_channel
*uchan
=
1189 trace_ust_find_channel_by_name(
1190 session
->ust_session
->domain_global
.channels
,
1191 DEFAULT_CHANNEL_NAME
);
1192 /* Created previously, this should NOT fail. */
1194 /* Remove from the channel list of the session. */
1195 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1197 trace_ust_destroy_channel(uchan
);
1203 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1205 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1206 char *channel_name
, struct lttng_event
*event
,
1207 struct lttng_filter_bytecode
*filter
, int wpipe
)
1209 int ret
, channel_created
= 0;
1210 struct lttng_channel
*attr
;
1214 assert(channel_name
);
1218 switch (domain
->type
) {
1219 case LTTNG_DOMAIN_KERNEL
:
1221 struct ltt_kernel_channel
*kchan
;
1224 * If a non-default channel has been created in the
1225 * session, explicitely require that -c chan_name needs
1228 if (session
->kernel_session
->has_non_default_channel
1229 && channel_name
[0] == '\0') {
1230 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1234 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1235 session
->kernel_session
);
1236 if (kchan
== NULL
) {
1237 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1238 LTTNG_BUFFER_GLOBAL
);
1240 ret
= LTTNG_ERR_FATAL
;
1243 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1245 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1246 if (ret
!= LTTNG_OK
) {
1252 channel_created
= 1;
1255 /* Get the newly created kernel channel pointer */
1256 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1257 session
->kernel_session
);
1258 if (kchan
== NULL
) {
1259 /* This sould not happen... */
1260 ret
= LTTNG_ERR_FATAL
;
1264 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1265 if (ret
!= LTTNG_OK
) {
1266 if (channel_created
) {
1267 /* Let's not leak a useless channel. */
1268 kernel_destroy_channel(kchan
);
1273 kernel_wait_quiescent(kernel_tracer_fd
);
1276 case LTTNG_DOMAIN_UST
:
1278 struct ltt_ust_channel
*uchan
;
1279 struct ltt_ust_session
*usess
= session
->ust_session
;
1284 * If a non-default channel has been created in the
1285 * session, explicitely require that -c chan_name needs
1288 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1289 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1293 /* Get channel from global UST domain */
1294 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1296 if (uchan
== NULL
) {
1297 /* Create default channel */
1298 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1299 usess
->buffer_type
);
1301 ret
= LTTNG_ERR_FATAL
;
1304 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1306 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1307 if (ret
!= LTTNG_OK
) {
1313 /* Get the newly created channel reference back */
1314 uchan
= trace_ust_find_channel_by_name(
1315 usess
->domain_global
.channels
, channel_name
);
1319 /* At this point, the session and channel exist on the tracer */
1320 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
, filter
);
1321 if (ret
!= LTTNG_OK
) {
1327 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1328 case LTTNG_DOMAIN_UST_PID
:
1329 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1332 ret
= LTTNG_ERR_UND
;
1344 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1346 int cmd_enable_event_all(struct ltt_session
*session
,
1347 struct lttng_domain
*domain
, char *channel_name
, int event_type
,
1348 struct lttng_filter_bytecode
*filter
, int wpipe
)
1351 struct lttng_channel
*attr
;
1354 assert(channel_name
);
1358 switch (domain
->type
) {
1359 case LTTNG_DOMAIN_KERNEL
:
1361 struct ltt_kernel_channel
*kchan
;
1363 assert(session
->kernel_session
);
1366 * If a non-default channel has been created in the
1367 * session, explicitely require that -c chan_name needs
1370 if (session
->kernel_session
->has_non_default_channel
1371 && channel_name
[0] == '\0') {
1372 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1376 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1377 session
->kernel_session
);
1378 if (kchan
== NULL
) {
1379 /* Create default channel */
1380 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1381 LTTNG_BUFFER_GLOBAL
);
1383 ret
= LTTNG_ERR_FATAL
;
1386 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1388 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1389 if (ret
!= LTTNG_OK
) {
1395 /* Get the newly created kernel channel pointer */
1396 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1397 session
->kernel_session
);
1401 switch (event_type
) {
1402 case LTTNG_EVENT_SYSCALL
:
1403 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1405 case LTTNG_EVENT_TRACEPOINT
:
1407 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1408 * events already registered to the channel.
1410 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1412 case LTTNG_EVENT_ALL
:
1413 /* Enable syscalls and tracepoints */
1414 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1417 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1421 /* Manage return value */
1422 if (ret
!= LTTNG_OK
) {
1424 * On error, cmd_enable_channel call will take care of destroying
1425 * the created channel if it was needed.
1430 kernel_wait_quiescent(kernel_tracer_fd
);
1433 case LTTNG_DOMAIN_UST
:
1435 struct ltt_ust_channel
*uchan
;
1436 struct ltt_ust_session
*usess
= session
->ust_session
;
1441 * If a non-default channel has been created in the
1442 * session, explicitely require that -c chan_name needs
1445 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1446 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1450 /* Get channel from global UST domain */
1451 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1453 if (uchan
== NULL
) {
1454 /* Create default channel */
1455 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1456 usess
->buffer_type
);
1458 ret
= LTTNG_ERR_FATAL
;
1461 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1463 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1464 if (ret
!= LTTNG_OK
) {
1470 /* Get the newly created channel reference back */
1471 uchan
= trace_ust_find_channel_by_name(
1472 usess
->domain_global
.channels
, channel_name
);
1476 /* At this point, the session and channel exist on the tracer */
1478 switch (event_type
) {
1479 case LTTNG_EVENT_ALL
:
1480 case LTTNG_EVENT_TRACEPOINT
:
1481 ret
= event_ust_enable_all_tracepoints(usess
, uchan
, filter
);
1482 if (ret
!= LTTNG_OK
) {
1487 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1491 /* Manage return value */
1492 if (ret
!= LTTNG_OK
) {
1499 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1500 case LTTNG_DOMAIN_UST_PID
:
1501 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1504 ret
= LTTNG_ERR_UND
;
1517 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1519 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1522 ssize_t nb_events
= 0;
1525 case LTTNG_DOMAIN_KERNEL
:
1526 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1527 if (nb_events
< 0) {
1528 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1532 case LTTNG_DOMAIN_UST
:
1533 nb_events
= ust_app_list_events(events
);
1534 if (nb_events
< 0) {
1535 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1540 ret
= LTTNG_ERR_UND
;
1547 /* Return negative value to differentiate return code */
1552 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1554 ssize_t
cmd_list_tracepoint_fields(int domain
,
1555 struct lttng_event_field
**fields
)
1558 ssize_t nb_fields
= 0;
1561 case LTTNG_DOMAIN_UST
:
1562 nb_fields
= ust_app_list_event_fields(fields
);
1563 if (nb_fields
< 0) {
1564 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1568 case LTTNG_DOMAIN_KERNEL
:
1569 default: /* fall-through */
1570 ret
= LTTNG_ERR_UND
;
1577 /* Return negative value to differentiate return code */
1582 * Command LTTNG_START_TRACE processed by the client thread.
1584 int cmd_start_trace(struct ltt_session
*session
)
1587 unsigned long nb_chan
= 0;
1588 struct ltt_kernel_session
*ksession
;
1589 struct ltt_ust_session
*usess
;
1593 /* Ease our life a bit ;) */
1594 ksession
= session
->kernel_session
;
1595 usess
= session
->ust_session
;
1597 /* Is the session already started? */
1598 if (session
->active
) {
1599 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1604 * Starting a session without channel is useless since after that it's not
1605 * possible to enable channel thus inform the client.
1607 if (usess
&& usess
->domain_global
.channels
) {
1608 nb_chan
+= lttng_ht_get_count(usess
->domain_global
.channels
);
1611 nb_chan
+= ksession
->channel_count
;
1614 ret
= LTTNG_ERR_NO_CHANNEL
;
1618 /* Kernel tracing */
1619 if (ksession
!= NULL
) {
1620 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1621 if (ret
!= LTTNG_OK
) {
1626 /* Flag session that trace should start automatically */
1628 usess
->start_trace
= 1;
1630 ret
= ust_app_start_trace_all(usess
);
1632 ret
= LTTNG_ERR_UST_START_FAIL
;
1637 /* Flag this after a successful start. */
1638 session
->has_been_started
= 1;
1639 session
->active
= 1;
1648 * Command LTTNG_STOP_TRACE processed by the client thread.
1650 int cmd_stop_trace(struct ltt_session
*session
)
1653 struct ltt_kernel_channel
*kchan
;
1654 struct ltt_kernel_session
*ksession
;
1655 struct ltt_ust_session
*usess
;
1660 ksession
= session
->kernel_session
;
1661 usess
= session
->ust_session
;
1663 /* Session is not active. Skip everythong and inform the client. */
1664 if (!session
->active
) {
1665 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1670 if (ksession
&& ksession
->started
) {
1671 DBG("Stop kernel tracing");
1673 /* Flush metadata if exist */
1674 if (ksession
->metadata_stream_fd
>= 0) {
1675 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1677 ERR("Kernel metadata flush failed");
1681 /* Flush all buffers before stopping */
1682 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1683 ret
= kernel_flush_buffer(kchan
);
1685 ERR("Kernel flush buffer error");
1689 ret
= kernel_stop_session(ksession
);
1691 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1695 kernel_wait_quiescent(kernel_tracer_fd
);
1697 ksession
->started
= 0;
1700 if (usess
&& usess
->start_trace
) {
1701 usess
->start_trace
= 0;
1703 ret
= ust_app_stop_trace_all(usess
);
1705 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1710 /* Flag inactive after a successful stop. */
1711 session
->active
= 0;
1719 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1721 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1722 size_t nb_uri
, struct lttng_uri
*uris
)
1725 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1726 struct ltt_ust_session
*usess
= session
->ust_session
;
1727 struct consumer_output
*consumer
= NULL
;
1733 /* Can't set consumer URI if the session is active. */
1734 if (session
->active
) {
1735 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1740 * This case switch makes sure the domain session has a temporary consumer
1741 * so the URL can be set.
1745 /* Code flow error. A session MUST always have a consumer object */
1746 assert(session
->consumer
);
1748 * The URL will be added to the tracing session consumer instead of a
1749 * specific domain consumer.
1751 consumer
= session
->consumer
;
1753 case LTTNG_DOMAIN_KERNEL
:
1754 /* Code flow error if we don't have a kernel session here. */
1756 assert(ksess
->consumer
);
1757 consumer
= ksess
->consumer
;
1759 case LTTNG_DOMAIN_UST
:
1760 /* Code flow error if we don't have a kernel session here. */
1762 assert(usess
->consumer
);
1763 consumer
= usess
->consumer
;
1767 for (i
= 0; i
< nb_uri
; i
++) {
1768 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1769 if (ret
!= LTTNG_OK
) {
1775 * Make sure to set the session in output mode after we set URI since a
1776 * session can be created without URL (thus flagged in no output mode).
1778 session
->output_traces
= 1;
1780 ksess
->output_traces
= 1;
1782 usess
->output_traces
= 1;
1793 * Command LTTNG_CREATE_SESSION processed by the client thread.
1795 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1796 size_t nb_uri
, lttng_sock_cred
*creds
)
1799 struct ltt_session
*session
;
1805 * Verify if the session already exist
1807 * XXX: There is no need for the session lock list here since the caller
1808 * (process_client_msg) is holding it. We might want to change that so a
1809 * single command does not lock the entire session list.
1811 session
= session_find_by_name(name
);
1812 if (session
!= NULL
) {
1813 ret
= LTTNG_ERR_EXIST_SESS
;
1817 /* Create tracing session in the registry */
1818 ret
= session_create(name
, LTTNG_SOCK_GET_UID_CRED(creds
),
1819 LTTNG_SOCK_GET_GID_CRED(creds
));
1820 if (ret
!= LTTNG_OK
) {
1825 * Get the newly created session pointer back
1827 * XXX: There is no need for the session lock list here since the caller
1828 * (process_client_msg) is holding it. We might want to change that so a
1829 * single command does not lock the entire session list.
1831 session
= session_find_by_name(name
);
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
);
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 switch (calibrate
->type
) {
1989 case LTTNG_CALIBRATE_FUNCTION
:
1991 /* Default and only possible calibrate option. */
1992 kcalibrate
.type
= LTTNG_KERNEL_CALIBRATE_KRETPROBE
;
1996 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1998 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
2003 case LTTNG_DOMAIN_UST
:
2005 struct lttng_ust_calibrate ucalibrate
;
2007 switch (calibrate
->type
) {
2008 case LTTNG_CALIBRATE_FUNCTION
:
2010 /* Default and only possible calibrate option. */
2011 ucalibrate
.type
= LTTNG_UST_CALIBRATE_TRACEPOINT
;
2015 ret
= ust_app_calibrate_glb(&ucalibrate
);
2017 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
2023 ret
= LTTNG_ERR_UND
;
2034 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2036 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2037 const char *sock_path
, struct consumer_data
*cdata
)
2040 struct consumer_socket
*socket
= NULL
;
2047 case LTTNG_DOMAIN_KERNEL
:
2049 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2053 /* Can't register a consumer if there is already one */
2054 if (ksess
->consumer_fds_sent
!= 0) {
2055 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2059 sock
= lttcomm_connect_unix_sock(sock_path
);
2061 ret
= LTTNG_ERR_CONNECT_FAIL
;
2064 cdata
->cmd_sock
= sock
;
2066 socket
= consumer_allocate_socket(&cdata
->cmd_sock
);
2067 if (socket
== NULL
) {
2070 PERROR("close register consumer");
2072 cdata
->cmd_sock
= -1;
2073 ret
= LTTNG_ERR_FATAL
;
2077 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
2078 if (socket
->lock
== NULL
) {
2079 PERROR("zmalloc pthread mutex");
2080 ret
= LTTNG_ERR_FATAL
;
2083 pthread_mutex_init(socket
->lock
, NULL
);
2084 socket
->registered
= 1;
2087 consumer_add_socket(socket
, ksess
->consumer
);
2090 pthread_mutex_lock(&cdata
->pid_mutex
);
2092 pthread_mutex_unlock(&cdata
->pid_mutex
);
2097 /* TODO: Userspace tracing */
2098 ret
= LTTNG_ERR_UND
;
2106 consumer_destroy_socket(socket
);
2112 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2114 ssize_t
cmd_list_domains(struct ltt_session
*session
,
2115 struct lttng_domain
**domains
)
2120 if (session
->kernel_session
!= NULL
) {
2121 DBG3("Listing domains found kernel domain");
2125 if (session
->ust_session
!= NULL
) {
2126 DBG3("Listing domains found UST global domain");
2130 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2131 if (*domains
== NULL
) {
2132 ret
= LTTNG_ERR_FATAL
;
2136 if (session
->kernel_session
!= NULL
) {
2137 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2141 if (session
->ust_session
!= NULL
) {
2142 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2143 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2150 /* Return negative value to differentiate return code */
2156 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2158 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
2159 struct lttng_channel
**channels
)
2162 ssize_t nb_chan
= 0;
2165 case LTTNG_DOMAIN_KERNEL
:
2166 if (session
->kernel_session
!= NULL
) {
2167 nb_chan
= session
->kernel_session
->channel_count
;
2169 DBG3("Number of kernel channels %zd", nb_chan
);
2171 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2174 case LTTNG_DOMAIN_UST
:
2175 if (session
->ust_session
!= NULL
) {
2176 nb_chan
= lttng_ht_get_count(
2177 session
->ust_session
->domain_global
.channels
);
2179 DBG3("Number of UST global channels %zd", nb_chan
);
2181 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2186 ret
= LTTNG_ERR_UND
;
2191 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2192 if (*channels
== NULL
) {
2193 ret
= LTTNG_ERR_FATAL
;
2197 list_lttng_channels(domain
, session
, *channels
);
2200 /* Ret value was set in the domain switch case */
2207 /* Return negative value to differentiate return code */
2212 * Command LTTNG_LIST_EVENTS processed by the client thread.
2214 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2215 char *channel_name
, struct lttng_event
**events
)
2218 ssize_t nb_event
= 0;
2221 case LTTNG_DOMAIN_KERNEL
:
2222 if (session
->kernel_session
!= NULL
) {
2223 nb_event
= list_lttng_kernel_events(channel_name
,
2224 session
->kernel_session
, events
);
2227 case LTTNG_DOMAIN_UST
:
2229 if (session
->ust_session
!= NULL
) {
2230 nb_event
= list_lttng_ust_global_events(channel_name
,
2231 &session
->ust_session
->domain_global
, events
);
2236 ret
= LTTNG_ERR_UND
;
2243 /* Return negative value to differentiate return code */
2248 * Using the session list, filled a lttng_session array to send back to the
2249 * client for session listing.
2251 * The session list lock MUST be acquired before calling this function. Use
2252 * session_lock_list() and session_unlock_list().
2254 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2259 struct ltt_session
*session
;
2260 struct ltt_session_list
*list
= session_get_list();
2262 DBG("Getting all available session for UID %d GID %d",
2265 * Iterate over session list and append data after the control struct in
2268 cds_list_for_each_entry(session
, &list
->head
, list
) {
2270 * Only list the sessions the user can control.
2272 if (!session_access_ok(session
, uid
, gid
)) {
2276 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2277 struct ltt_ust_session
*usess
= session
->ust_session
;
2279 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2280 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2281 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2282 ret
= build_network_session_path(sessions
[i
].path
,
2283 sizeof(sessions
[i
].path
), session
);
2285 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
2286 session
->consumer
->dst
.trace_path
);
2289 PERROR("snprintf session path");
2293 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2294 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2295 sessions
[i
].enabled
= session
->active
;
2296 sessions
[i
].snapshot_mode
= session
->snapshot_mode
;
2302 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2303 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2305 int cmd_data_pending(struct ltt_session
*session
)
2308 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2309 struct ltt_ust_session
*usess
= session
->ust_session
;
2313 /* Session MUST be stopped to ask for data availability. */
2314 if (session
->active
) {
2315 ret
= LTTNG_ERR_SESSION_STARTED
;
2319 * If stopped, just make sure we've started before else the above call
2320 * will always send that there is data pending.
2322 * The consumer assumes that when the data pending command is received,
2323 * the trace has been started before or else no output data is written
2324 * by the streams which is a condition for data pending. So, this is
2325 * *VERY* important that we don't ask the consumer before a start
2328 if (!session
->has_been_started
) {
2334 if (ksess
&& ksess
->consumer
) {
2335 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2337 /* Data is still being extracted for the kernel. */
2342 if (usess
&& usess
->consumer
) {
2343 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2345 /* Data is still being extracted for the kernel. */
2350 /* Data is ready to be read by a viewer */
2358 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2360 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2362 int cmd_snapshot_add_output(struct ltt_session
*session
,
2363 struct lttng_snapshot_output
*output
, uint32_t *id
)
2366 struct snapshot_output
*new_output
;
2371 DBG("Cmd snapshot add output for session %s", session
->name
);
2374 * Permission denied to create an output if the session is not
2375 * set in no output mode.
2377 if (session
->output_traces
) {
2378 ret
= LTTNG_ERR_EPERM
;
2382 /* Only one output is allowed until we have the "tee" feature. */
2383 if (session
->snapshot
.nb_output
== 1) {
2384 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
2388 new_output
= snapshot_output_alloc();
2390 ret
= LTTNG_ERR_NOMEM
;
2394 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2395 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
2396 &session
->snapshot
);
2398 if (ret
== -ENOMEM
) {
2399 ret
= LTTNG_ERR_NOMEM
;
2401 ret
= LTTNG_ERR_INVALID
;
2407 snapshot_add_output(&session
->snapshot
, new_output
);
2409 *id
= new_output
->id
;
2416 snapshot_output_destroy(new_output
);
2422 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2424 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2426 int cmd_snapshot_del_output(struct ltt_session
*session
,
2427 struct lttng_snapshot_output
*output
)
2430 struct snapshot_output
*sout
= NULL
;
2438 * Permission denied to create an output if the session is not
2439 * set in no output mode.
2441 if (session
->output_traces
) {
2442 ret
= LTTNG_ERR_EPERM
;
2447 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
2449 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
2450 } else if (*output
->name
!= '\0') {
2451 DBG("Cmd snapshot del output name %s for session %s", output
->name
,
2453 sout
= snapshot_find_output_by_name(output
->name
, &session
->snapshot
);
2456 ret
= LTTNG_ERR_INVALID
;
2460 snapshot_delete_output(&session
->snapshot
, sout
);
2461 snapshot_output_destroy(sout
);
2470 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2472 * If no output is available, outputs is untouched and 0 is returned.
2474 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2476 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
2477 struct lttng_snapshot_output
**outputs
)
2480 struct lttng_snapshot_output
*list
;
2481 struct lttng_ht_iter iter
;
2482 struct snapshot_output
*output
;
2487 DBG("Cmd snapshot list outputs for session %s", session
->name
);
2490 * Permission denied to create an output if the session is not
2491 * set in no output mode.
2493 if (session
->output_traces
) {
2494 ret
= LTTNG_ERR_EPERM
;
2498 if (session
->snapshot
.nb_output
== 0) {
2503 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
2505 ret
= LTTNG_ERR_NOMEM
;
2509 /* Copy list from session to the new list object. */
2510 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
2511 output
, node
.node
) {
2512 assert(output
->consumer
);
2513 list
[idx
].id
= output
->id
;
2514 list
[idx
].max_size
= output
->max_size
;
2515 strncpy(list
[idx
].name
, output
->name
, sizeof(list
[idx
].name
));
2516 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
2517 strncpy(list
[idx
].ctrl_url
, output
->consumer
->dst
.trace_path
,
2518 sizeof(list
[idx
].ctrl_url
));
2521 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
2522 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
2524 ret
= LTTNG_ERR_NOMEM
;
2529 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
2530 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
2532 ret
= LTTNG_ERR_NOMEM
;
2540 return session
->snapshot
.nb_output
;
2549 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2550 * snapshot output is *not* set with a remote destination.
2552 * Return 0 on success or a LTTNG_ERR code.
2554 static int set_relayd_for_snapshot(struct consumer_output
*consumer
,
2555 struct snapshot_output
*snap_output
, struct ltt_session
*session
)
2558 struct lttng_ht_iter iter
;
2559 struct consumer_socket
*socket
;
2562 assert(snap_output
);
2565 DBG2("Set relayd object from snapshot output");
2567 /* Ignore if snapshot consumer output is not network. */
2568 if (snap_output
->consumer
->type
!= CONSUMER_DST_NET
) {
2573 * For each consumer socket, create and send the relayd object of the
2577 cds_lfht_for_each_entry(snap_output
->consumer
->socks
->ht
, &iter
.iter
,
2578 socket
, node
.node
) {
2579 ret
= send_consumer_relayd_sockets(0, session
->id
,
2580 snap_output
->consumer
, socket
);
2581 if (ret
!= LTTNG_OK
) {
2593 * Record a kernel snapshot.
2595 * Return 0 on success or a LTTNG_ERR code.
2597 static int record_kernel_snapshot(struct ltt_kernel_session
*ksess
,
2598 struct snapshot_output
*output
, struct ltt_session
*session
,
2599 int wait
, int nb_streams
)
2607 /* Get the datetime for the snapshot output directory. */
2608 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
2609 sizeof(output
->datetime
));
2611 ret
= LTTNG_ERR_INVALID
;
2616 * Copy kernel session sockets so we can communicate with the right
2617 * consumer for the snapshot record command.
2619 ret
= consumer_copy_sockets(output
->consumer
, ksess
->consumer
);
2621 ret
= LTTNG_ERR_NOMEM
;
2625 ret
= set_relayd_for_snapshot(ksess
->consumer
, output
, session
);
2626 if (ret
!= LTTNG_OK
) {
2627 goto error_snapshot
;
2630 ret
= kernel_snapshot_record(ksess
, output
, wait
, nb_streams
);
2631 if (ret
!= LTTNG_OK
) {
2632 goto error_snapshot
;
2638 /* Clean up copied sockets so this output can use some other later on. */
2639 consumer_destroy_output_sockets(output
->consumer
);
2645 * Record a UST snapshot.
2647 * Return 0 on success or a LTTNG_ERR error code.
2649 static int record_ust_snapshot(struct ltt_ust_session
*usess
,
2650 struct snapshot_output
*output
, struct ltt_session
*session
,
2651 int wait
, int nb_streams
)
2659 /* Get the datetime for the snapshot output directory. */
2660 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
2661 sizeof(output
->datetime
));
2663 ret
= LTTNG_ERR_INVALID
;
2668 * Copy UST session sockets so we can communicate with the right
2669 * consumer for the snapshot record command.
2671 ret
= consumer_copy_sockets(output
->consumer
, usess
->consumer
);
2673 ret
= LTTNG_ERR_NOMEM
;
2677 ret
= set_relayd_for_snapshot(usess
->consumer
, output
, session
);
2678 if (ret
!= LTTNG_OK
) {
2679 goto error_snapshot
;
2682 ret
= ust_app_snapshot_record(usess
, output
, wait
, nb_streams
);
2686 ret
= LTTNG_ERR_INVALID
;
2689 ret
= LTTNG_ERR_SNAPSHOT_NODATA
;
2692 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
2695 goto error_snapshot
;
2701 /* Clean up copied sockets so this output can use some other later on. */
2702 consumer_destroy_output_sockets(output
->consumer
);
2708 * Returns the total number of streams for a session or a negative value
2711 static unsigned int get_total_nb_stream(struct ltt_session
*session
)
2713 unsigned int total_streams
= 0;
2715 if (session
->kernel_session
) {
2716 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2718 total_streams
+= ksess
->stream_count_global
;
2721 if (session
->ust_session
) {
2722 struct ltt_ust_session
*usess
= session
->ust_session
;
2724 total_streams
+= ust_app_get_nb_stream(usess
);
2727 return total_streams
;
2731 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2733 * The wait parameter is ignored so this call always wait for the snapshot to
2734 * complete before returning.
2736 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2738 int cmd_snapshot_record(struct ltt_session
*session
,
2739 struct lttng_snapshot_output
*output
, int wait
)
2742 unsigned int use_tmp_output
= 0;
2743 struct snapshot_output tmp_output
;
2744 unsigned int nb_streams
, snapshot_success
= 0;
2748 DBG("Cmd snapshot record for session %s", session
->name
);
2751 * Permission denied to create an output if the session is not
2752 * set in no output mode.
2754 if (session
->output_traces
) {
2755 ret
= LTTNG_ERR_EPERM
;
2759 /* The session needs to be started at least once. */
2760 if (!session
->has_been_started
) {
2761 ret
= LTTNG_ERR_START_SESSION_ONCE
;
2765 /* Use temporary output for the session. */
2766 if (output
&& *output
->ctrl_url
!= '\0') {
2767 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2768 output
->ctrl_url
, output
->data_url
, session
->consumer
,
2771 if (ret
== -ENOMEM
) {
2772 ret
= LTTNG_ERR_NOMEM
;
2774 ret
= LTTNG_ERR_INVALID
;
2778 /* Use the global session count for the temporary snapshot. */
2779 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
2784 * Get the total number of stream of that session which is used by the
2785 * maximum size of the snapshot feature.
2787 nb_streams
= get_total_nb_stream(session
);
2789 if (session
->kernel_session
) {
2790 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2792 if (use_tmp_output
) {
2793 ret
= record_kernel_snapshot(ksess
, &tmp_output
, session
,
2795 if (ret
!= LTTNG_OK
) {
2798 snapshot_success
= 1;
2800 struct snapshot_output
*sout
;
2801 struct lttng_ht_iter iter
;
2804 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
2805 &iter
.iter
, sout
, node
.node
) {
2807 * Make a local copy of the output and assign the possible
2808 * temporary value given by the caller.
2810 memset(&tmp_output
, 0, sizeof(tmp_output
));
2811 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
2813 /* Use temporary max size. */
2814 if (output
->max_size
!= (uint64_t) -1ULL) {
2815 tmp_output
.max_size
= output
->max_size
;
2818 /* Use temporary name. */
2819 if (*output
->name
!= '\0') {
2820 strncpy(tmp_output
.name
, output
->name
,
2821 sizeof(tmp_output
.name
));
2824 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
2826 ret
= record_kernel_snapshot(ksess
, &tmp_output
,
2827 session
, wait
, nb_streams
);
2828 if (ret
!= LTTNG_OK
) {
2832 snapshot_success
= 1;
2838 if (session
->ust_session
) {
2839 struct ltt_ust_session
*usess
= session
->ust_session
;
2841 if (use_tmp_output
) {
2842 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
2844 if (ret
!= LTTNG_OK
) {
2847 snapshot_success
= 1;
2849 struct snapshot_output
*sout
;
2850 struct lttng_ht_iter iter
;
2853 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
2854 &iter
.iter
, sout
, node
.node
) {
2856 * Make a local copy of the output and assign the possible
2857 * temporary value given by the caller.
2859 memset(&tmp_output
, 0, sizeof(tmp_output
));
2860 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
2862 /* Use temporary max size. */
2863 if (output
->max_size
!= (uint64_t) -1ULL) {
2864 tmp_output
.max_size
= output
->max_size
;
2867 /* Use temporary name. */
2868 if (*output
->name
!= '\0') {
2869 strncpy(tmp_output
.name
, output
->name
,
2870 sizeof(tmp_output
.name
));
2873 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
2875 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
2877 if (ret
!= LTTNG_OK
) {
2881 snapshot_success
= 1;
2887 if (snapshot_success
) {
2888 session
->snapshot
.nb_snapshot
++;
2890 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
2898 * Init command subsystem.
2903 * Set network sequence index to 1 for streams to match a relayd
2904 * socket on the consumer side.
2906 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
2907 relayd_net_seq_idx
= 1;
2908 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
2910 DBG("Command subsystem initialized");