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>
33 #include "health-sessiond.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 JUL domain events.
188 * Return number of events in list on success or else a negative value.
190 static int list_lttng_jul_events(struct jul_domain
*dom
,
191 struct lttng_event
**events
)
194 unsigned int nb_event
= 0;
195 struct jul_event
*event
;
196 struct lttng_event
*tmp_events
;
197 struct lttng_ht_iter iter
;
202 DBG3("Listing JUL events");
204 nb_event
= lttng_ht_get_count(dom
->events
);
210 tmp_events
= zmalloc(nb_event
* sizeof(*tmp_events
));
212 PERROR("zmalloc JUL events session");
213 ret
= -LTTNG_ERR_FATAL
;
218 cds_lfht_for_each_entry(dom
->events
->ht
, &iter
.iter
, event
, node
.node
) {
219 strncpy(tmp_events
[i
].name
, event
->name
, sizeof(tmp_events
[i
].name
));
220 tmp_events
[i
].name
[sizeof(tmp_events
[i
].name
) - 1] = '\0';
221 tmp_events
[i
].enabled
= event
->enabled
;
226 *events
= tmp_events
;
230 assert(nb_event
== i
);
235 * Create a list of ust global domain events.
237 static int list_lttng_ust_global_events(char *channel_name
,
238 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
241 unsigned int nb_event
= 0;
242 struct lttng_ht_iter iter
;
243 struct lttng_ht_node_str
*node
;
244 struct ltt_ust_channel
*uchan
;
245 struct ltt_ust_event
*uevent
;
246 struct lttng_event
*tmp
;
248 DBG("Listing UST global events for channel %s", channel_name
);
252 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
253 node
= lttng_ht_iter_get_node_str(&iter
);
255 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
259 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
261 nb_event
+= lttng_ht_get_count(uchan
->events
);
268 DBG3("Listing UST global %d events", nb_event
);
270 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
272 ret
= LTTNG_ERR_FATAL
;
276 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
277 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
278 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
279 tmp
[i
].enabled
= uevent
->enabled
;
281 switch (uevent
->attr
.instrumentation
) {
282 case LTTNG_UST_TRACEPOINT
:
283 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
285 case LTTNG_UST_PROBE
:
286 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
288 case LTTNG_UST_FUNCTION
:
289 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
293 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
294 switch (uevent
->attr
.loglevel_type
) {
295 case LTTNG_UST_LOGLEVEL_ALL
:
296 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
298 case LTTNG_UST_LOGLEVEL_RANGE
:
299 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
301 case LTTNG_UST_LOGLEVEL_SINGLE
:
302 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
305 if (uevent
->filter
) {
320 * Fill lttng_event array of all kernel events in the channel.
322 static int list_lttng_kernel_events(char *channel_name
,
323 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
326 unsigned int nb_event
;
327 struct ltt_kernel_event
*event
;
328 struct ltt_kernel_channel
*kchan
;
330 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
332 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
336 nb_event
= kchan
->event_count
;
338 DBG("Listing events for channel %s", kchan
->channel
->name
);
344 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
345 if (*events
== NULL
) {
346 ret
= LTTNG_ERR_FATAL
;
350 /* Kernel channels */
351 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
352 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
353 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
354 (*events
)[i
].enabled
= event
->enabled
;
356 switch (event
->event
->instrumentation
) {
357 case LTTNG_KERNEL_TRACEPOINT
:
358 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
360 case LTTNG_KERNEL_KRETPROBE
:
361 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
362 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
363 sizeof(struct lttng_kernel_kprobe
));
365 case LTTNG_KERNEL_KPROBE
:
366 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
367 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
368 sizeof(struct lttng_kernel_kprobe
));
370 case LTTNG_KERNEL_FUNCTION
:
371 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
372 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
373 sizeof(struct lttng_kernel_function
));
375 case LTTNG_KERNEL_NOOP
:
376 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
378 case LTTNG_KERNEL_SYSCALL
:
379 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
381 case LTTNG_KERNEL_ALL
:
392 /* Negate the error code to differentiate the size from an error */
397 * Add URI so the consumer output object. Set the correct path depending on the
398 * domain adding the default trace directory.
400 static int add_uri_to_consumer(struct consumer_output
*consumer
,
401 struct lttng_uri
*uri
, int domain
, const char *session_name
)
404 const char *default_trace_dir
;
408 if (consumer
== NULL
) {
409 DBG("No consumer detected. Don't add URI. Stopping.");
410 ret
= LTTNG_ERR_NO_CONSUMER
;
415 case LTTNG_DOMAIN_KERNEL
:
416 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
418 case LTTNG_DOMAIN_UST
:
419 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
423 * This case is possible is we try to add the URI to the global tracing
424 * session consumer object which in this case there is no subdir.
426 default_trace_dir
= "";
429 switch (uri
->dtype
) {
432 DBG2("Setting network URI to consumer");
434 if (consumer
->type
== CONSUMER_DST_NET
) {
435 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
436 consumer
->dst
.net
.control_isset
) ||
437 (uri
->stype
== LTTNG_STREAM_DATA
&&
438 consumer
->dst
.net
.data_isset
)) {
439 ret
= LTTNG_ERR_URL_EXIST
;
443 memset(&consumer
->dst
.net
, 0, sizeof(consumer
->dst
.net
));
446 consumer
->type
= CONSUMER_DST_NET
;
448 /* Set URI into consumer output object */
449 ret
= consumer_set_network_uri(consumer
, uri
);
453 } else if (ret
== 1) {
455 * URI was the same in the consumer so we do not append the subdir
456 * again so to not duplicate output dir.
461 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
462 ret
= consumer_set_subdir(consumer
, session_name
);
464 ret
= LTTNG_ERR_FATAL
;
469 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
470 /* On a new subdir, reappend the default trace dir. */
471 strncat(consumer
->subdir
, default_trace_dir
,
472 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
473 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
478 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
479 memset(consumer
->dst
.trace_path
, 0,
480 sizeof(consumer
->dst
.trace_path
));
481 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
482 sizeof(consumer
->dst
.trace_path
));
483 /* Append default trace dir */
484 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
485 sizeof(consumer
->dst
.trace_path
) -
486 strlen(consumer
->dst
.trace_path
) - 1);
487 /* Flag consumer as local. */
488 consumer
->type
= CONSUMER_DST_LOCAL
;
499 * Init tracing by creating trace directory and sending fds kernel consumer.
501 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
504 struct lttng_ht_iter iter
;
505 struct consumer_socket
*socket
;
511 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
512 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
514 pthread_mutex_lock(socket
->lock
);
515 ret
= kernel_consumer_send_session(socket
, session
);
516 pthread_mutex_unlock(socket
->lock
);
518 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
530 * Create a socket to the relayd using the URI.
532 * On success, the relayd_sock pointer is set to the created socket.
533 * Else, it's stays untouched and a lttcomm error code is returned.
535 static int create_connect_relayd(struct lttng_uri
*uri
,
536 struct lttcomm_relayd_sock
**relayd_sock
)
539 struct lttcomm_relayd_sock
*rsock
;
541 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
542 RELAYD_VERSION_COMM_MINOR
);
544 ret
= LTTNG_ERR_FATAL
;
549 * Connect to relayd so we can proceed with a session creation. This call
550 * can possibly block for an arbitrary amount of time to set the health
551 * state to be in poll execution.
554 ret
= relayd_connect(rsock
);
557 ERR("Unable to reach lttng-relayd");
558 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
562 /* Create socket for control stream. */
563 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
564 DBG3("Creating relayd stream socket from URI");
566 /* Check relayd version */
567 ret
= relayd_version_check(rsock
);
569 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
572 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
573 DBG3("Creating relayd data socket from URI");
575 /* Command is not valid */
576 ERR("Relayd invalid stream type: %d", uri
->stype
);
577 ret
= LTTNG_ERR_INVALID
;
581 *relayd_sock
= rsock
;
586 /* The returned value is not useful since we are on an error path. */
587 (void) relayd_close(rsock
);
595 * Connect to the relayd using URI and send the socket to the right consumer.
597 static int send_consumer_relayd_socket(int domain
, unsigned int session_id
,
598 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
599 struct consumer_socket
*consumer_sock
,
600 char *session_name
, char *hostname
, int session_live_timer
)
603 struct lttcomm_relayd_sock
*rsock
= NULL
;
605 /* Connect to relayd and make version check if uri is the control. */
606 ret
= create_connect_relayd(relayd_uri
, &rsock
);
607 if (ret
!= LTTNG_OK
) {
612 /* Set the network sequence index if not set. */
613 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
614 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
616 * Increment net_seq_idx because we are about to transfer the
617 * new relayd socket to the consumer.
618 * Assign unique key so the consumer can match streams.
620 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
621 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
624 /* Send relayd socket to consumer. */
625 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
626 relayd_uri
->stype
, session_id
,
627 session_name
, hostname
, session_live_timer
);
629 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
633 /* Flag that the corresponding socket was sent. */
634 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
635 consumer_sock
->control_sock_sent
= 1;
636 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
637 consumer_sock
->data_sock_sent
= 1;
643 * Close socket which was dup on the consumer side. The session daemon does
644 * NOT keep track of the relayd socket(s) once transfer to the consumer.
648 (void) relayd_close(rsock
);
652 if (ret
!= LTTNG_OK
) {
654 * The consumer output for this session should not be used anymore
655 * since the relayd connection failed thus making any tracing or/and
656 * streaming not usable.
658 consumer
->enabled
= 0;
664 * Send both relayd sockets to a specific consumer and domain. This is a
665 * helper function to facilitate sending the information to the consumer for a
668 static int send_consumer_relayd_sockets(int domain
, unsigned int session_id
,
669 struct consumer_output
*consumer
, struct consumer_socket
*sock
,
670 char *session_name
, char *hostname
, int session_live_timer
)
677 /* Sending control relayd socket. */
678 if (!sock
->control_sock_sent
) {
679 ret
= send_consumer_relayd_socket(domain
, session_id
,
680 &consumer
->dst
.net
.control
, consumer
, sock
,
681 session_name
, hostname
, session_live_timer
);
682 if (ret
!= LTTNG_OK
) {
687 /* Sending data relayd socket. */
688 if (!sock
->data_sock_sent
) {
689 ret
= send_consumer_relayd_socket(domain
, session_id
,
690 &consumer
->dst
.net
.data
, consumer
, sock
,
691 session_name
, hostname
, session_live_timer
);
692 if (ret
!= LTTNG_OK
) {
702 * Setup relayd connections for a tracing session. First creates the socket to
703 * the relayd and send them to the right domain consumer. Consumer type MUST be
706 int cmd_setup_relayd(struct ltt_session
*session
)
709 struct ltt_ust_session
*usess
;
710 struct ltt_kernel_session
*ksess
;
711 struct consumer_socket
*socket
;
712 struct lttng_ht_iter iter
;
716 usess
= session
->ust_session
;
717 ksess
= session
->kernel_session
;
719 DBG("Setting relayd for session %s", session
->name
);
723 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
724 && usess
->consumer
->enabled
) {
725 /* For each consumer socket, send relayd sockets */
726 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
728 pthread_mutex_lock(socket
->lock
);
729 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
->id
,
730 usess
->consumer
, socket
,
731 session
->name
, session
->hostname
,
732 session
->live_timer
);
733 pthread_mutex_unlock(socket
->lock
);
734 if (ret
!= LTTNG_OK
) {
737 /* Session is now ready for network streaming. */
738 session
->net_handle
= 1;
742 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
743 && ksess
->consumer
->enabled
) {
744 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
746 pthread_mutex_lock(socket
->lock
);
747 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
->id
,
748 ksess
->consumer
, socket
,
749 session
->name
, session
->hostname
,
750 session
->live_timer
);
751 pthread_mutex_unlock(socket
->lock
);
752 if (ret
!= LTTNG_OK
) {
755 /* Session is now ready for network streaming. */
756 session
->net_handle
= 1;
766 * Start a kernel session by opening all necessary streams.
768 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
771 struct ltt_kernel_channel
*kchan
;
773 /* Open kernel metadata */
774 if (ksess
->metadata
== NULL
&& ksess
->output_traces
) {
775 ret
= kernel_open_metadata(ksess
);
777 ret
= LTTNG_ERR_KERN_META_FAIL
;
782 /* Open kernel metadata stream */
783 if (ksess
->metadata
&& ksess
->metadata_stream_fd
< 0) {
784 ret
= kernel_open_metadata_stream(ksess
);
786 ERR("Kernel create metadata stream failed");
787 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
792 /* For each channel */
793 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
794 if (kchan
->stream_count
== 0) {
795 ret
= kernel_open_channel_stream(kchan
);
797 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
800 /* Update the stream global counter */
801 ksess
->stream_count_global
+= ret
;
805 /* Setup kernel consumer socket and send fds to it */
806 ret
= init_kernel_tracing(ksess
);
808 ret
= LTTNG_ERR_KERN_START_FAIL
;
812 /* This start the kernel tracing */
813 ret
= kernel_start_session(ksess
);
815 ret
= LTTNG_ERR_KERN_START_FAIL
;
819 /* Quiescent wait after starting trace */
820 kernel_wait_quiescent(kernel_tracer_fd
);
831 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
833 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
837 struct ltt_ust_session
*usess
;
839 usess
= session
->ust_session
;
844 case LTTNG_DOMAIN_KERNEL
:
846 ret
= channel_kernel_disable(session
->kernel_session
,
848 if (ret
!= LTTNG_OK
) {
852 kernel_wait_quiescent(kernel_tracer_fd
);
855 case LTTNG_DOMAIN_UST
:
857 struct ltt_ust_channel
*uchan
;
858 struct lttng_ht
*chan_ht
;
860 chan_ht
= usess
->domain_global
.channels
;
862 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
864 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
868 ret
= channel_ust_disable(usess
, uchan
);
869 if (ret
!= LTTNG_OK
) {
875 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
876 case LTTNG_DOMAIN_UST_EXEC_NAME
:
877 case LTTNG_DOMAIN_UST_PID
:
880 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
892 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
894 * The wpipe arguments is used as a notifier for the kernel thread.
896 int cmd_enable_channel(struct ltt_session
*session
,
897 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
900 struct ltt_ust_session
*usess
= session
->ust_session
;
901 struct lttng_ht
*chan_ht
;
907 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
912 * Don't try to enable a channel if the session has been started at
913 * some point in time before. The tracer does not allow it.
915 if (session
->started
) {
916 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
921 * If the session is a live session, remove the switch timer, the
922 * live timer does the same thing but sends also synchronisation
923 * beacons for inactive streams.
925 if (session
->live_timer
> 0) {
926 attr
->attr
.live_timer_interval
= session
->live_timer
;
927 attr
->attr
.switch_timer_interval
= 0;
930 switch (domain
->type
) {
931 case LTTNG_DOMAIN_KERNEL
:
933 struct ltt_kernel_channel
*kchan
;
935 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
936 session
->kernel_session
);
939 * Don't try to create a channel if the session
940 * has been started at some point in time
941 * before. The tracer does not allow it.
943 if (session
->started
) {
944 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
947 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
948 if (attr
->name
[0] != '\0') {
949 session
->kernel_session
->has_non_default_channel
= 1;
952 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
955 if (ret
!= LTTNG_OK
) {
959 kernel_wait_quiescent(kernel_tracer_fd
);
962 case LTTNG_DOMAIN_UST
:
964 struct ltt_ust_channel
*uchan
;
966 chan_ht
= usess
->domain_global
.channels
;
968 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
971 * Don't try to create a channel if the session
972 * has been started at some point in time
973 * before. The tracer does not allow it.
975 if (session
->started
) {
976 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
979 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
980 if (attr
->name
[0] != '\0') {
981 usess
->has_non_default_channel
= 1;
984 ret
= channel_ust_enable(usess
, uchan
);
989 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1000 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1002 int cmd_disable_event(struct ltt_session
*session
, int domain
,
1003 char *channel_name
, char *event_name
)
1010 case LTTNG_DOMAIN_KERNEL
:
1012 struct ltt_kernel_channel
*kchan
;
1013 struct ltt_kernel_session
*ksess
;
1015 ksess
= session
->kernel_session
;
1018 * If a non-default channel has been created in the
1019 * session, explicitely require that -c chan_name needs
1022 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1023 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1027 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1028 if (kchan
== NULL
) {
1029 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1033 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
1034 if (ret
!= LTTNG_OK
) {
1038 kernel_wait_quiescent(kernel_tracer_fd
);
1041 case LTTNG_DOMAIN_UST
:
1043 struct ltt_ust_channel
*uchan
;
1044 struct ltt_ust_session
*usess
;
1046 usess
= session
->ust_session
;
1049 * If a non-default channel has been created in the
1050 * session, explicitely require that -c chan_name needs
1053 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1054 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1058 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1060 if (uchan
== NULL
) {
1061 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1065 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
1066 if (ret
!= LTTNG_OK
) {
1070 DBG3("Disable UST event %s in channel %s completed", event_name
,
1074 case LTTNG_DOMAIN_JUL
:
1076 struct ltt_ust_session
*usess
= session
->ust_session
;
1080 ret
= event_jul_disable(usess
, event_name
);
1081 if (ret
!= LTTNG_OK
) {
1088 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1089 case LTTNG_DOMAIN_UST_PID
:
1090 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1093 ret
= LTTNG_ERR_UND
;
1105 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1107 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
1115 case LTTNG_DOMAIN_KERNEL
:
1117 struct ltt_kernel_session
*ksess
;
1118 struct ltt_kernel_channel
*kchan
;
1120 ksess
= session
->kernel_session
;
1123 * If a non-default channel has been created in the
1124 * session, explicitely require that -c chan_name needs
1127 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1128 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1132 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1133 if (kchan
== NULL
) {
1134 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1138 ret
= event_kernel_disable_all(kchan
);
1139 if (ret
!= LTTNG_OK
) {
1143 kernel_wait_quiescent(kernel_tracer_fd
);
1146 case LTTNG_DOMAIN_UST
:
1148 struct ltt_ust_session
*usess
;
1149 struct ltt_ust_channel
*uchan
;
1151 usess
= session
->ust_session
;
1154 * If a non-default channel has been created in the
1155 * session, explicitely require that -c chan_name needs
1158 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1159 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1163 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1165 if (uchan
== NULL
) {
1166 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1170 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1175 DBG3("Disable all UST events in channel %s completed", channel_name
);
1179 case LTTNG_DOMAIN_JUL
:
1181 struct ltt_ust_session
*usess
= session
->ust_session
;
1185 ret
= event_jul_disable_all(usess
);
1186 if (ret
!= LTTNG_OK
) {
1193 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1194 case LTTNG_DOMAIN_UST_PID
:
1195 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1198 ret
= LTTNG_ERR_UND
;
1210 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1212 int cmd_add_context(struct ltt_session
*session
, int domain
,
1213 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1215 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1218 case LTTNG_DOMAIN_KERNEL
:
1219 assert(session
->kernel_session
);
1221 if (session
->kernel_session
->channel_count
== 0) {
1222 /* Create default channel */
1223 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1224 if (ret
!= LTTNG_OK
) {
1227 chan_kern_created
= 1;
1229 /* Add kernel context to kernel tracer */
1230 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1231 if (ret
!= LTTNG_OK
) {
1235 case LTTNG_DOMAIN_UST
:
1237 struct ltt_ust_session
*usess
= session
->ust_session
;
1238 unsigned int chan_count
;
1242 chan_count
= lttng_ht_get_count(usess
->domain_global
.channels
);
1243 if (chan_count
== 0) {
1244 struct lttng_channel
*attr
;
1245 /* Create default channel */
1246 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1248 ret
= LTTNG_ERR_FATAL
;
1252 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1253 if (ret
!= LTTNG_OK
) {
1258 chan_ust_created
= 1;
1261 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1262 if (ret
!= LTTNG_OK
) {
1268 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1269 case LTTNG_DOMAIN_UST_PID
:
1270 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1273 ret
= LTTNG_ERR_UND
;
1280 if (chan_kern_created
) {
1281 struct ltt_kernel_channel
*kchan
=
1282 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1283 session
->kernel_session
);
1284 /* Created previously, this should NOT fail. */
1286 kernel_destroy_channel(kchan
);
1289 if (chan_ust_created
) {
1290 struct ltt_ust_channel
*uchan
=
1291 trace_ust_find_channel_by_name(
1292 session
->ust_session
->domain_global
.channels
,
1293 DEFAULT_CHANNEL_NAME
);
1294 /* Created previously, this should NOT fail. */
1296 /* Remove from the channel list of the session. */
1297 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1299 trace_ust_destroy_channel(uchan
);
1305 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1307 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1308 char *channel_name
, struct lttng_event
*event
,
1309 struct lttng_filter_bytecode
*filter
,
1310 struct lttng_event_exclusion
*exclusion
,
1313 int ret
, channel_created
= 0;
1314 struct lttng_channel
*attr
;
1318 assert(channel_name
);
1322 switch (domain
->type
) {
1323 case LTTNG_DOMAIN_KERNEL
:
1325 struct ltt_kernel_channel
*kchan
;
1328 * If a non-default channel has been created in the
1329 * session, explicitely require that -c chan_name needs
1332 if (session
->kernel_session
->has_non_default_channel
1333 && channel_name
[0] == '\0') {
1334 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1338 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1339 session
->kernel_session
);
1340 if (kchan
== NULL
) {
1341 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1342 LTTNG_BUFFER_GLOBAL
);
1344 ret
= LTTNG_ERR_FATAL
;
1347 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1349 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1350 if (ret
!= LTTNG_OK
) {
1356 channel_created
= 1;
1359 /* Get the newly created kernel channel pointer */
1360 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1361 session
->kernel_session
);
1362 if (kchan
== NULL
) {
1363 /* This sould not happen... */
1364 ret
= LTTNG_ERR_FATAL
;
1368 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1369 if (ret
!= LTTNG_OK
) {
1370 if (channel_created
) {
1371 /* Let's not leak a useless channel. */
1372 kernel_destroy_channel(kchan
);
1377 kernel_wait_quiescent(kernel_tracer_fd
);
1380 case LTTNG_DOMAIN_UST
:
1382 struct ltt_ust_channel
*uchan
;
1383 struct ltt_ust_session
*usess
= session
->ust_session
;
1388 * If a non-default channel has been created in the
1389 * session, explicitely require that -c chan_name needs
1392 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1393 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1397 /* Get channel from global UST domain */
1398 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1400 if (uchan
== NULL
) {
1401 /* Create default channel */
1402 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1403 usess
->buffer_type
);
1405 ret
= LTTNG_ERR_FATAL
;
1408 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1410 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1411 if (ret
!= LTTNG_OK
) {
1417 /* Get the newly created channel reference back */
1418 uchan
= trace_ust_find_channel_by_name(
1419 usess
->domain_global
.channels
, channel_name
);
1423 /* At this point, the session and channel exist on the tracer */
1424 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
, filter
, exclusion
);
1425 if (ret
!= LTTNG_OK
) {
1430 case LTTNG_DOMAIN_JUL
:
1432 struct lttng_event uevent
;
1433 struct lttng_domain tmp_dom
;
1434 struct ltt_ust_session
*usess
= session
->ust_session
;
1438 /* Create the default JUL tracepoint. */
1439 uevent
.type
= LTTNG_EVENT_TRACEPOINT
;
1440 uevent
.loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
1441 strncpy(uevent
.name
, DEFAULT_JUL_EVENT_NAME
, sizeof(uevent
.name
));
1442 uevent
.name
[sizeof(uevent
.name
) - 1] = '\0';
1445 * The domain type is changed because we are about to enable the
1446 * default channel and event for the JUL domain that are hardcoded.
1447 * This happens in the UST domain.
1449 memcpy(&tmp_dom
, domain
, sizeof(tmp_dom
));
1450 tmp_dom
.type
= LTTNG_DOMAIN_UST
;
1452 ret
= cmd_enable_event(session
, &tmp_dom
, DEFAULT_JUL_CHANNEL_NAME
,
1453 &uevent
, NULL
, NULL
, wpipe
);
1454 if (ret
!= LTTNG_OK
&& ret
!= LTTNG_ERR_UST_EVENT_ENABLED
) {
1458 /* The wild card * means that everything should be enabled. */
1459 if (strncmp(event
->name
, "*", 1) == 0 && strlen(event
->name
) == 1) {
1460 ret
= event_jul_enable_all(usess
);
1462 ret
= event_jul_enable(usess
, event
);
1464 if (ret
!= LTTNG_OK
) {
1471 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1472 case LTTNG_DOMAIN_UST_PID
:
1473 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1476 ret
= LTTNG_ERR_UND
;
1488 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1490 int cmd_enable_event_all(struct ltt_session
*session
,
1491 struct lttng_domain
*domain
, char *channel_name
, int event_type
,
1492 struct lttng_filter_bytecode
*filter
, int wpipe
)
1495 struct lttng_channel
*attr
;
1498 assert(channel_name
);
1502 switch (domain
->type
) {
1503 case LTTNG_DOMAIN_KERNEL
:
1505 struct ltt_kernel_channel
*kchan
;
1507 assert(session
->kernel_session
);
1510 * If a non-default channel has been created in the
1511 * session, explicitely require that -c chan_name needs
1514 if (session
->kernel_session
->has_non_default_channel
1515 && channel_name
[0] == '\0') {
1516 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1520 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1521 session
->kernel_session
);
1522 if (kchan
== NULL
) {
1523 /* Create default channel */
1524 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1525 LTTNG_BUFFER_GLOBAL
);
1527 ret
= LTTNG_ERR_FATAL
;
1530 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1532 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1533 if (ret
!= LTTNG_OK
) {
1539 /* Get the newly created kernel channel pointer */
1540 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1541 session
->kernel_session
);
1545 switch (event_type
) {
1546 case LTTNG_EVENT_SYSCALL
:
1547 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1549 case LTTNG_EVENT_TRACEPOINT
:
1551 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1552 * events already registered to the channel.
1554 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1556 case LTTNG_EVENT_ALL
:
1557 /* Enable syscalls and tracepoints */
1558 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1561 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1565 /* Manage return value */
1566 if (ret
!= LTTNG_OK
) {
1568 * On error, cmd_enable_channel call will take care of destroying
1569 * the created channel if it was needed.
1574 kernel_wait_quiescent(kernel_tracer_fd
);
1577 case LTTNG_DOMAIN_UST
:
1579 struct ltt_ust_channel
*uchan
;
1580 struct ltt_ust_session
*usess
= session
->ust_session
;
1585 * If a non-default channel has been created in the
1586 * session, explicitely require that -c chan_name needs
1589 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1590 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1594 /* Get channel from global UST domain */
1595 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1597 if (uchan
== NULL
) {
1598 /* Create default channel */
1599 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1600 usess
->buffer_type
);
1602 ret
= LTTNG_ERR_FATAL
;
1605 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1607 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1608 if (ret
!= LTTNG_OK
) {
1614 /* Get the newly created channel reference back */
1615 uchan
= trace_ust_find_channel_by_name(
1616 usess
->domain_global
.channels
, channel_name
);
1620 /* At this point, the session and channel exist on the tracer */
1622 switch (event_type
) {
1623 case LTTNG_EVENT_ALL
:
1624 case LTTNG_EVENT_TRACEPOINT
:
1625 ret
= event_ust_enable_all_tracepoints(usess
, uchan
, filter
);
1626 if (ret
!= LTTNG_OK
) {
1631 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1635 /* Manage return value */
1636 if (ret
!= LTTNG_OK
) {
1642 case LTTNG_DOMAIN_JUL
:
1644 struct lttng_event uevent
;
1645 struct lttng_domain tmp_dom
;
1646 struct ltt_ust_session
*usess
= session
->ust_session
;
1650 /* Create the default JUL tracepoint. */
1651 uevent
.type
= LTTNG_EVENT_TRACEPOINT
;
1652 uevent
.loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
1653 strncpy(uevent
.name
, DEFAULT_JUL_EVENT_NAME
, sizeof(uevent
.name
));
1654 uevent
.name
[sizeof(uevent
.name
) - 1] = '\0';
1657 * The domain type is changed because we are about to enable the
1658 * default channel and event for the JUL domain that are hardcoded.
1659 * This happens in the UST domain.
1661 memcpy(&tmp_dom
, domain
, sizeof(tmp_dom
));
1662 tmp_dom
.type
= LTTNG_DOMAIN_UST
;
1664 ret
= cmd_enable_event(session
, &tmp_dom
, DEFAULT_JUL_CHANNEL_NAME
,
1665 &uevent
, NULL
, NULL
, wpipe
);
1666 if (ret
!= LTTNG_OK
&& ret
!= LTTNG_ERR_UST_EVENT_ENABLED
) {
1670 ret
= event_jul_enable_all(usess
);
1671 if (ret
!= LTTNG_OK
) {
1678 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1679 case LTTNG_DOMAIN_UST_PID
:
1680 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1683 ret
= LTTNG_ERR_UND
;
1696 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1698 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1701 ssize_t nb_events
= 0;
1704 case LTTNG_DOMAIN_KERNEL
:
1705 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1706 if (nb_events
< 0) {
1707 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1711 case LTTNG_DOMAIN_UST
:
1712 nb_events
= ust_app_list_events(events
);
1713 if (nb_events
< 0) {
1714 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1718 case LTTNG_DOMAIN_JUL
:
1719 nb_events
= jul_list_events(events
);
1720 if (nb_events
< 0) {
1721 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1726 ret
= LTTNG_ERR_UND
;
1733 /* Return negative value to differentiate return code */
1738 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1740 ssize_t
cmd_list_tracepoint_fields(int domain
,
1741 struct lttng_event_field
**fields
)
1744 ssize_t nb_fields
= 0;
1747 case LTTNG_DOMAIN_UST
:
1748 nb_fields
= ust_app_list_event_fields(fields
);
1749 if (nb_fields
< 0) {
1750 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1754 case LTTNG_DOMAIN_KERNEL
:
1755 default: /* fall-through */
1756 ret
= LTTNG_ERR_UND
;
1763 /* Return negative value to differentiate return code */
1768 * Command LTTNG_START_TRACE processed by the client thread.
1770 int cmd_start_trace(struct ltt_session
*session
)
1773 struct ltt_kernel_session
*ksession
;
1774 struct ltt_ust_session
*usess
;
1778 /* Ease our life a bit ;) */
1779 ksession
= session
->kernel_session
;
1780 usess
= session
->ust_session
;
1782 if (session
->enabled
) {
1783 /* Already started. */
1784 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1788 session
->enabled
= 1;
1790 /* Kernel tracing */
1791 if (ksession
!= NULL
) {
1792 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1793 if (ret
!= LTTNG_OK
) {
1798 /* Flag session that trace should start automatically */
1800 usess
->start_trace
= 1;
1802 ret
= ust_app_start_trace_all(usess
);
1804 ret
= LTTNG_ERR_UST_START_FAIL
;
1809 session
->started
= 1;
1818 * Command LTTNG_STOP_TRACE processed by the client thread.
1820 int cmd_stop_trace(struct ltt_session
*session
)
1823 struct ltt_kernel_channel
*kchan
;
1824 struct ltt_kernel_session
*ksession
;
1825 struct ltt_ust_session
*usess
;
1830 ksession
= session
->kernel_session
;
1831 usess
= session
->ust_session
;
1833 if (!session
->enabled
) {
1834 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1838 session
->enabled
= 0;
1841 if (ksession
&& ksession
->started
) {
1842 DBG("Stop kernel tracing");
1844 /* Flush metadata if exist */
1845 if (ksession
->metadata_stream_fd
>= 0) {
1846 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1848 ERR("Kernel metadata flush failed");
1852 /* Flush all buffers before stopping */
1853 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1854 ret
= kernel_flush_buffer(kchan
);
1856 ERR("Kernel flush buffer error");
1860 ret
= kernel_stop_session(ksession
);
1862 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1866 kernel_wait_quiescent(kernel_tracer_fd
);
1868 ksession
->started
= 0;
1871 if (usess
&& usess
->start_trace
) {
1872 usess
->start_trace
= 0;
1874 ret
= ust_app_stop_trace_all(usess
);
1876 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1888 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1890 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1891 size_t nb_uri
, struct lttng_uri
*uris
)
1894 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1895 struct ltt_ust_session
*usess
= session
->ust_session
;
1896 struct consumer_output
*consumer
= NULL
;
1902 /* Can't enable consumer after session started. */
1903 if (session
->enabled
) {
1904 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1909 * This case switch makes sure the domain session has a temporary consumer
1910 * so the URL can be set.
1914 /* Code flow error. A session MUST always have a consumer object */
1915 assert(session
->consumer
);
1917 * The URL will be added to the tracing session consumer instead of a
1918 * specific domain consumer.
1920 consumer
= session
->consumer
;
1922 case LTTNG_DOMAIN_KERNEL
:
1923 /* Code flow error if we don't have a kernel session here. */
1925 assert(ksess
->consumer
);
1926 consumer
= ksess
->consumer
;
1928 case LTTNG_DOMAIN_UST
:
1929 /* Code flow error if we don't have a kernel session here. */
1931 assert(usess
->consumer
);
1932 consumer
= usess
->consumer
;
1936 for (i
= 0; i
< nb_uri
; i
++) {
1937 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1938 if (ret
!= LTTNG_OK
) {
1951 * Command LTTNG_CREATE_SESSION processed by the client thread.
1953 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1954 size_t nb_uri
, lttng_sock_cred
*creds
, unsigned int live_timer
)
1957 struct ltt_session
*session
;
1963 * Verify if the session already exist
1965 * XXX: There is no need for the session lock list here since the caller
1966 * (process_client_msg) is holding it. We might want to change that so a
1967 * single command does not lock the entire session list.
1969 session
= session_find_by_name(name
);
1970 if (session
!= NULL
) {
1971 ret
= LTTNG_ERR_EXIST_SESS
;
1975 /* Create tracing session in the registry */
1976 ret
= session_create(name
, LTTNG_SOCK_GET_UID_CRED(creds
),
1977 LTTNG_SOCK_GET_GID_CRED(creds
));
1978 if (ret
!= LTTNG_OK
) {
1983 * Get the newly created session pointer back
1985 * XXX: There is no need for the session lock list here since the caller
1986 * (process_client_msg) is holding it. We might want to change that so a
1987 * single command does not lock the entire session list.
1989 session
= session_find_by_name(name
);
1992 session
->live_timer
= live_timer
;
1993 /* Create default consumer output for the session not yet created. */
1994 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1995 if (session
->consumer
== NULL
) {
1996 ret
= LTTNG_ERR_FATAL
;
1997 goto consumer_error
;
2001 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
2002 if (ret
!= LTTNG_OK
) {
2003 goto consumer_error
;
2005 session
->output_traces
= 1;
2007 session
->output_traces
= 0;
2008 DBG2("Session %s created with no output", session
->name
);
2011 session
->consumer
->enabled
= 1;
2016 session_destroy(session
);
2023 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2025 int cmd_create_session_snapshot(char *name
, struct lttng_uri
*uris
,
2026 size_t nb_uri
, lttng_sock_cred
*creds
)
2029 struct ltt_session
*session
;
2030 struct snapshot_output
*new_output
= NULL
;
2036 * Create session in no output mode with URIs set to NULL. The uris we've
2037 * received are for a default snapshot output if one.
2039 ret
= cmd_create_session_uri(name
, NULL
, 0, creds
, -1);
2040 if (ret
!= LTTNG_OK
) {
2044 /* Get the newly created session pointer back. This should NEVER fail. */
2045 session
= session_find_by_name(name
);
2048 /* Flag session for snapshot mode. */
2049 session
->snapshot_mode
= 1;
2051 /* Skip snapshot output creation if no URI is given. */
2056 new_output
= snapshot_output_alloc();
2058 ret
= LTTNG_ERR_NOMEM
;
2059 goto error_snapshot_alloc
;
2062 ret
= snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE
, NULL
,
2063 uris
, nb_uri
, session
->consumer
, new_output
, &session
->snapshot
);
2065 if (ret
== -ENOMEM
) {
2066 ret
= LTTNG_ERR_NOMEM
;
2068 ret
= LTTNG_ERR_INVALID
;
2070 goto error_snapshot
;
2074 snapshot_add_output(&session
->snapshot
, new_output
);
2081 snapshot_output_destroy(new_output
);
2082 error_snapshot_alloc
:
2083 session_destroy(session
);
2089 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2091 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
2094 struct ltt_ust_session
*usess
;
2095 struct ltt_kernel_session
*ksess
;
2100 usess
= session
->ust_session
;
2101 ksess
= session
->kernel_session
;
2103 /* Clean kernel session teardown */
2104 kernel_destroy_session(ksess
);
2106 /* UST session teardown */
2108 /* Close any relayd session */
2109 consumer_output_send_destroy_relayd(usess
->consumer
);
2111 /* Destroy every UST application related to this session. */
2112 ret
= ust_app_destroy_trace_all(usess
);
2114 ERR("Error in ust_app_destroy_trace_all");
2117 /* Clean up the rest. */
2118 trace_ust_destroy_session(usess
);
2122 * Must notify the kernel thread here to update it's poll set in order to
2123 * remove the channel(s)' fd just destroyed.
2125 ret
= notify_thread_pipe(wpipe
);
2127 PERROR("write kernel poll pipe");
2130 ret
= session_destroy(session
);
2136 * Command LTTNG_CALIBRATE processed by the client thread.
2138 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
2143 case LTTNG_DOMAIN_KERNEL
:
2145 struct lttng_kernel_calibrate kcalibrate
;
2147 kcalibrate
.type
= calibrate
->type
;
2148 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2150 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
2155 case LTTNG_DOMAIN_UST
:
2157 struct lttng_ust_calibrate ucalibrate
;
2159 ucalibrate
.type
= calibrate
->type
;
2160 ret
= ust_app_calibrate_glb(&ucalibrate
);
2162 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
2168 ret
= LTTNG_ERR_UND
;
2179 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2181 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2182 const char *sock_path
, struct consumer_data
*cdata
)
2185 struct consumer_socket
*socket
= NULL
;
2192 case LTTNG_DOMAIN_KERNEL
:
2194 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2198 /* Can't register a consumer if there is already one */
2199 if (ksess
->consumer_fds_sent
!= 0) {
2200 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2204 sock
= lttcomm_connect_unix_sock(sock_path
);
2206 ret
= LTTNG_ERR_CONNECT_FAIL
;
2209 cdata
->cmd_sock
= sock
;
2211 socket
= consumer_allocate_socket(&cdata
->cmd_sock
);
2212 if (socket
== NULL
) {
2215 PERROR("close register consumer");
2217 cdata
->cmd_sock
= -1;
2218 ret
= LTTNG_ERR_FATAL
;
2222 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
2223 if (socket
->lock
== NULL
) {
2224 PERROR("zmalloc pthread mutex");
2225 ret
= LTTNG_ERR_FATAL
;
2228 pthread_mutex_init(socket
->lock
, NULL
);
2229 socket
->registered
= 1;
2232 consumer_add_socket(socket
, ksess
->consumer
);
2235 pthread_mutex_lock(&cdata
->pid_mutex
);
2237 pthread_mutex_unlock(&cdata
->pid_mutex
);
2242 /* TODO: Userspace tracing */
2243 ret
= LTTNG_ERR_UND
;
2251 consumer_destroy_socket(socket
);
2257 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2259 ssize_t
cmd_list_domains(struct ltt_session
*session
,
2260 struct lttng_domain
**domains
)
2265 if (session
->kernel_session
!= NULL
) {
2266 DBG3("Listing domains found kernel domain");
2270 if (session
->ust_session
!= NULL
) {
2271 DBG3("Listing domains found UST global domain");
2274 if (session
->ust_session
->domain_jul
.being_used
) {
2279 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2280 if (*domains
== NULL
) {
2281 ret
= LTTNG_ERR_FATAL
;
2285 if (session
->kernel_session
!= NULL
) {
2286 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2290 if (session
->ust_session
!= NULL
) {
2291 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2292 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2295 if (session
->ust_session
->domain_jul
.being_used
) {
2296 (*domains
)[index
].type
= LTTNG_DOMAIN_JUL
;
2297 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2305 /* Return negative value to differentiate return code */
2311 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2313 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
2314 struct lttng_channel
**channels
)
2317 ssize_t nb_chan
= 0;
2320 case LTTNG_DOMAIN_KERNEL
:
2321 if (session
->kernel_session
!= NULL
) {
2322 nb_chan
= session
->kernel_session
->channel_count
;
2324 DBG3("Number of kernel channels %zd", nb_chan
);
2326 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2329 case LTTNG_DOMAIN_UST
:
2330 if (session
->ust_session
!= NULL
) {
2331 nb_chan
= lttng_ht_get_count(
2332 session
->ust_session
->domain_global
.channels
);
2334 DBG3("Number of UST global channels %zd", nb_chan
);
2336 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2341 ret
= LTTNG_ERR_UND
;
2346 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2347 if (*channels
== NULL
) {
2348 ret
= LTTNG_ERR_FATAL
;
2352 list_lttng_channels(domain
, session
, *channels
);
2355 /* Ret value was set in the domain switch case */
2362 /* Return negative value to differentiate return code */
2367 * Command LTTNG_LIST_EVENTS processed by the client thread.
2369 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2370 char *channel_name
, struct lttng_event
**events
)
2373 ssize_t nb_event
= 0;
2376 case LTTNG_DOMAIN_KERNEL
:
2377 if (session
->kernel_session
!= NULL
) {
2378 nb_event
= list_lttng_kernel_events(channel_name
,
2379 session
->kernel_session
, events
);
2382 case LTTNG_DOMAIN_UST
:
2384 if (session
->ust_session
!= NULL
) {
2385 nb_event
= list_lttng_ust_global_events(channel_name
,
2386 &session
->ust_session
->domain_global
, events
);
2390 case LTTNG_DOMAIN_JUL
:
2391 if (session
->ust_session
) {
2392 nb_event
= list_lttng_jul_events(
2393 &session
->ust_session
->domain_jul
, events
);
2397 ret
= LTTNG_ERR_UND
;
2404 /* Return negative value to differentiate return code */
2409 * Using the session list, filled a lttng_session array to send back to the
2410 * client for session listing.
2412 * The session list lock MUST be acquired before calling this function. Use
2413 * session_lock_list() and session_unlock_list().
2415 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2420 struct ltt_session
*session
;
2421 struct ltt_session_list
*list
= session_get_list();
2423 DBG("Getting all available session for UID %d GID %d",
2426 * Iterate over session list and append data after the control struct in
2429 cds_list_for_each_entry(session
, &list
->head
, list
) {
2431 * Only list the sessions the user can control.
2433 if (!session_access_ok(session
, uid
, gid
)) {
2437 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2438 struct ltt_ust_session
*usess
= session
->ust_session
;
2440 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2441 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2442 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2443 ret
= build_network_session_path(sessions
[i
].path
,
2444 sizeof(sessions
[i
].path
), session
);
2446 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
2447 session
->consumer
->dst
.trace_path
);
2450 PERROR("snprintf session path");
2454 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2455 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2456 sessions
[i
].enabled
= session
->enabled
;
2457 sessions
[i
].snapshot_mode
= session
->snapshot_mode
;
2463 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2464 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2466 int cmd_data_pending(struct ltt_session
*session
)
2469 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2470 struct ltt_ust_session
*usess
= session
->ust_session
;
2474 /* Session MUST be stopped to ask for data availability. */
2475 if (session
->enabled
) {
2476 ret
= LTTNG_ERR_SESSION_STARTED
;
2480 if (ksess
&& ksess
->consumer
) {
2481 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2483 /* Data is still being extracted for the kernel. */
2488 if (usess
&& usess
->consumer
) {
2489 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2491 /* Data is still being extracted for the kernel. */
2496 /* Data is ready to be read by a viewer */
2504 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2506 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2508 int cmd_snapshot_add_output(struct ltt_session
*session
,
2509 struct lttng_snapshot_output
*output
, uint32_t *id
)
2512 struct snapshot_output
*new_output
;
2517 DBG("Cmd snapshot add output for session %s", session
->name
);
2520 * Permission denied to create an output if the session is not
2521 * set in no output mode.
2523 if (session
->output_traces
) {
2524 ret
= LTTNG_ERR_EPERM
;
2528 /* Only one output is allowed until we have the "tee" feature. */
2529 if (session
->snapshot
.nb_output
== 1) {
2530 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
2534 new_output
= snapshot_output_alloc();
2536 ret
= LTTNG_ERR_NOMEM
;
2540 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2541 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
2542 &session
->snapshot
);
2544 if (ret
== -ENOMEM
) {
2545 ret
= LTTNG_ERR_NOMEM
;
2547 ret
= LTTNG_ERR_INVALID
;
2553 snapshot_add_output(&session
->snapshot
, new_output
);
2555 *id
= new_output
->id
;
2562 snapshot_output_destroy(new_output
);
2568 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2570 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2572 int cmd_snapshot_del_output(struct ltt_session
*session
,
2573 struct lttng_snapshot_output
*output
)
2576 struct snapshot_output
*sout
= NULL
;
2584 * Permission denied to create an output if the session is not
2585 * set in no output mode.
2587 if (session
->output_traces
) {
2588 ret
= LTTNG_ERR_EPERM
;
2593 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
2595 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
2596 } else if (*output
->name
!= '\0') {
2597 DBG("Cmd snapshot del output name %s for session %s", output
->name
,
2599 sout
= snapshot_find_output_by_name(output
->name
, &session
->snapshot
);
2602 ret
= LTTNG_ERR_INVALID
;
2606 snapshot_delete_output(&session
->snapshot
, sout
);
2607 snapshot_output_destroy(sout
);
2616 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2618 * If no output is available, outputs is untouched and 0 is returned.
2620 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2622 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
2623 struct lttng_snapshot_output
**outputs
)
2626 struct lttng_snapshot_output
*list
;
2627 struct lttng_ht_iter iter
;
2628 struct snapshot_output
*output
;
2633 DBG("Cmd snapshot list outputs for session %s", session
->name
);
2636 * Permission denied to create an output if the session is not
2637 * set in no output mode.
2639 if (session
->output_traces
) {
2640 ret
= LTTNG_ERR_EPERM
;
2644 if (session
->snapshot
.nb_output
== 0) {
2649 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
2651 ret
= LTTNG_ERR_NOMEM
;
2655 /* Copy list from session to the new list object. */
2656 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
2657 output
, node
.node
) {
2658 assert(output
->consumer
);
2659 list
[idx
].id
= output
->id
;
2660 list
[idx
].max_size
= output
->max_size
;
2661 strncpy(list
[idx
].name
, output
->name
, sizeof(list
[idx
].name
));
2662 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
2663 strncpy(list
[idx
].ctrl_url
, output
->consumer
->dst
.trace_path
,
2664 sizeof(list
[idx
].ctrl_url
));
2667 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
2668 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
2670 ret
= LTTNG_ERR_NOMEM
;
2675 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
2676 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
2678 ret
= LTTNG_ERR_NOMEM
;
2686 return session
->snapshot
.nb_output
;
2695 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2696 * snapshot output is *not* set with a remote destination.
2698 * Return 0 on success or a LTTNG_ERR code.
2700 static int set_relayd_for_snapshot(struct consumer_output
*consumer
,
2701 struct snapshot_output
*snap_output
, struct ltt_session
*session
)
2704 struct lttng_ht_iter iter
;
2705 struct consumer_socket
*socket
;
2708 assert(snap_output
);
2711 DBG2("Set relayd object from snapshot output");
2713 /* Ignore if snapshot consumer output is not network. */
2714 if (snap_output
->consumer
->type
!= CONSUMER_DST_NET
) {
2719 * For each consumer socket, create and send the relayd object of the
2723 cds_lfht_for_each_entry(snap_output
->consumer
->socks
->ht
, &iter
.iter
,
2724 socket
, node
.node
) {
2725 ret
= send_consumer_relayd_sockets(0, session
->id
,
2726 snap_output
->consumer
, socket
,
2727 session
->name
, session
->hostname
,
2728 session
->live_timer
);
2729 if (ret
!= LTTNG_OK
) {
2741 * Record a kernel snapshot.
2743 * Return LTTNG_OK on success or a LTTNG_ERR code.
2745 static int record_kernel_snapshot(struct ltt_kernel_session
*ksess
,
2746 struct snapshot_output
*output
, struct ltt_session
*session
,
2747 int wait
, int nb_streams
)
2755 /* Get the datetime for the snapshot output directory. */
2756 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
2757 sizeof(output
->datetime
));
2759 ret
= LTTNG_ERR_INVALID
;
2764 * Copy kernel session sockets so we can communicate with the right
2765 * consumer for the snapshot record command.
2767 ret
= consumer_copy_sockets(output
->consumer
, ksess
->consumer
);
2769 ret
= LTTNG_ERR_NOMEM
;
2773 ret
= set_relayd_for_snapshot(ksess
->consumer
, output
, session
);
2774 if (ret
!= LTTNG_OK
) {
2775 goto error_snapshot
;
2778 ret
= kernel_snapshot_record(ksess
, output
, wait
, nb_streams
);
2779 if (ret
!= LTTNG_OK
) {
2780 goto error_snapshot
;
2786 /* Clean up copied sockets so this output can use some other later on. */
2787 consumer_destroy_output_sockets(output
->consumer
);
2793 * Record a UST snapshot.
2795 * Return 0 on success or a LTTNG_ERR error code.
2797 static int record_ust_snapshot(struct ltt_ust_session
*usess
,
2798 struct snapshot_output
*output
, struct ltt_session
*session
,
2799 int wait
, int nb_streams
)
2807 /* Get the datetime for the snapshot output directory. */
2808 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
2809 sizeof(output
->datetime
));
2811 ret
= LTTNG_ERR_INVALID
;
2816 * Copy UST session sockets so we can communicate with the right
2817 * consumer for the snapshot record command.
2819 ret
= consumer_copy_sockets(output
->consumer
, usess
->consumer
);
2821 ret
= LTTNG_ERR_NOMEM
;
2825 ret
= set_relayd_for_snapshot(usess
->consumer
, output
, session
);
2826 if (ret
!= LTTNG_OK
) {
2827 goto error_snapshot
;
2830 ret
= ust_app_snapshot_record(usess
, output
, wait
, nb_streams
);
2832 if (ret
== -EINVAL
) {
2833 ret
= LTTNG_ERR_INVALID
;
2834 goto error_snapshot
;
2837 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
2838 goto error_snapshot
;
2844 /* Clean up copied sockets so this output can use some other later on. */
2845 consumer_destroy_output_sockets(output
->consumer
);
2851 * Returns the total number of streams for a session or a negative value
2854 static unsigned int get_total_nb_stream(struct ltt_session
*session
)
2856 unsigned int total_streams
= 0;
2858 if (session
->kernel_session
) {
2859 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2861 total_streams
+= ksess
->stream_count_global
;
2864 if (session
->ust_session
) {
2865 struct ltt_ust_session
*usess
= session
->ust_session
;
2867 total_streams
+= ust_app_get_nb_stream(usess
);
2870 return total_streams
;
2874 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2876 * The wait parameter is ignored so this call always wait for the snapshot to
2877 * complete before returning.
2879 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2881 int cmd_snapshot_record(struct ltt_session
*session
,
2882 struct lttng_snapshot_output
*output
, int wait
)
2885 unsigned int use_tmp_output
= 0;
2886 struct snapshot_output tmp_output
;
2887 unsigned int nb_streams
, snapshot_success
= 0;
2891 DBG("Cmd snapshot record for session %s", session
->name
);
2894 * Permission denied to create an output if the session is not
2895 * set in no output mode.
2897 if (session
->output_traces
) {
2898 ret
= LTTNG_ERR_EPERM
;
2902 /* The session needs to be started at least once. */
2903 if (!session
->started
) {
2904 ret
= LTTNG_ERR_START_SESSION_ONCE
;
2908 /* Use temporary output for the session. */
2909 if (output
&& *output
->ctrl_url
!= '\0') {
2910 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2911 output
->ctrl_url
, output
->data_url
, session
->consumer
,
2914 if (ret
== -ENOMEM
) {
2915 ret
= LTTNG_ERR_NOMEM
;
2917 ret
= LTTNG_ERR_INVALID
;
2921 /* Use the global session count for the temporary snapshot. */
2922 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
2927 * Get the total number of stream of that session which is used by the
2928 * maximum size of the snapshot feature.
2930 nb_streams
= get_total_nb_stream(session
);
2932 if (session
->kernel_session
) {
2933 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2935 if (use_tmp_output
) {
2936 ret
= record_kernel_snapshot(ksess
, &tmp_output
, session
,
2938 if (ret
!= LTTNG_OK
) {
2941 snapshot_success
= 1;
2943 struct snapshot_output
*sout
;
2944 struct lttng_ht_iter iter
;
2947 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
2948 &iter
.iter
, sout
, node
.node
) {
2950 * Make a local copy of the output and assign the possible
2951 * temporary value given by the caller.
2953 memset(&tmp_output
, 0, sizeof(tmp_output
));
2954 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
2956 /* Use temporary max size. */
2957 if (output
->max_size
!= (uint64_t) -1ULL) {
2958 tmp_output
.max_size
= output
->max_size
;
2961 /* Use temporary name. */
2962 if (*output
->name
!= '\0') {
2963 strncpy(tmp_output
.name
, output
->name
,
2964 sizeof(tmp_output
.name
));
2967 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
2969 ret
= record_kernel_snapshot(ksess
, &tmp_output
,
2970 session
, wait
, nb_streams
);
2971 if (ret
!= LTTNG_OK
) {
2975 snapshot_success
= 1;
2981 if (session
->ust_session
) {
2982 struct ltt_ust_session
*usess
= session
->ust_session
;
2984 if (use_tmp_output
) {
2985 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
2987 if (ret
!= LTTNG_OK
) {
2990 snapshot_success
= 1;
2992 struct snapshot_output
*sout
;
2993 struct lttng_ht_iter iter
;
2996 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
2997 &iter
.iter
, sout
, node
.node
) {
2999 * Make a local copy of the output and assign the possible
3000 * temporary value given by the caller.
3002 memset(&tmp_output
, 0, sizeof(tmp_output
));
3003 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
3005 /* Use temporary max size. */
3006 if (output
->max_size
!= (uint64_t) -1ULL) {
3007 tmp_output
.max_size
= output
->max_size
;
3010 /* Use temporary name. */
3011 if (*output
->name
!= '\0') {
3012 strncpy(tmp_output
.name
, output
->name
,
3013 sizeof(tmp_output
.name
));
3016 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3018 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
3020 if (ret
!= LTTNG_OK
) {
3024 snapshot_success
= 1;
3030 if (snapshot_success
) {
3031 session
->snapshot
.nb_snapshot
++;
3033 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
3041 * Init command subsystem.
3046 * Set network sequence index to 1 for streams to match a relayd
3047 * socket on the consumer side.
3049 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
3050 relayd_net_seq_idx
= 1;
3051 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
3053 DBG("Command subsystem initialized");