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
) {
308 if (uevent
->exclusion
) {
309 tmp
[i
].exclusion
= 1;
323 * Fill lttng_event array of all kernel events in the channel.
325 static int list_lttng_kernel_events(char *channel_name
,
326 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
329 unsigned int nb_event
;
330 struct ltt_kernel_event
*event
;
331 struct ltt_kernel_channel
*kchan
;
333 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
335 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
339 nb_event
= kchan
->event_count
;
341 DBG("Listing events for channel %s", kchan
->channel
->name
);
347 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
348 if (*events
== NULL
) {
349 ret
= LTTNG_ERR_FATAL
;
353 /* Kernel channels */
354 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
355 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
356 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
357 (*events
)[i
].enabled
= event
->enabled
;
359 switch (event
->event
->instrumentation
) {
360 case LTTNG_KERNEL_TRACEPOINT
:
361 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
363 case LTTNG_KERNEL_KRETPROBE
:
364 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
365 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
366 sizeof(struct lttng_kernel_kprobe
));
368 case LTTNG_KERNEL_KPROBE
:
369 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
370 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
371 sizeof(struct lttng_kernel_kprobe
));
373 case LTTNG_KERNEL_FUNCTION
:
374 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
375 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
376 sizeof(struct lttng_kernel_function
));
378 case LTTNG_KERNEL_NOOP
:
379 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
381 case LTTNG_KERNEL_SYSCALL
:
382 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
384 case LTTNG_KERNEL_ALL
:
395 /* Negate the error code to differentiate the size from an error */
400 * Add URI so the consumer output object. Set the correct path depending on the
401 * domain adding the default trace directory.
403 static int add_uri_to_consumer(struct consumer_output
*consumer
,
404 struct lttng_uri
*uri
, int domain
, const char *session_name
)
407 const char *default_trace_dir
;
411 if (consumer
== NULL
) {
412 DBG("No consumer detected. Don't add URI. Stopping.");
413 ret
= LTTNG_ERR_NO_CONSUMER
;
418 case LTTNG_DOMAIN_KERNEL
:
419 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
421 case LTTNG_DOMAIN_UST
:
422 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
426 * This case is possible is we try to add the URI to the global tracing
427 * session consumer object which in this case there is no subdir.
429 default_trace_dir
= "";
432 switch (uri
->dtype
) {
435 DBG2("Setting network URI to consumer");
437 if (consumer
->type
== CONSUMER_DST_NET
) {
438 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
439 consumer
->dst
.net
.control_isset
) ||
440 (uri
->stype
== LTTNG_STREAM_DATA
&&
441 consumer
->dst
.net
.data_isset
)) {
442 ret
= LTTNG_ERR_URL_EXIST
;
446 memset(&consumer
->dst
.net
, 0, sizeof(consumer
->dst
.net
));
449 consumer
->type
= CONSUMER_DST_NET
;
451 /* Set URI into consumer output object */
452 ret
= consumer_set_network_uri(consumer
, uri
);
456 } else if (ret
== 1) {
458 * URI was the same in the consumer so we do not append the subdir
459 * again so to not duplicate output dir.
465 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
466 ret
= consumer_set_subdir(consumer
, session_name
);
468 ret
= LTTNG_ERR_FATAL
;
473 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
474 /* On a new subdir, reappend the default trace dir. */
475 strncat(consumer
->subdir
, default_trace_dir
,
476 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
477 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
482 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
483 memset(consumer
->dst
.trace_path
, 0,
484 sizeof(consumer
->dst
.trace_path
));
485 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
486 sizeof(consumer
->dst
.trace_path
));
487 /* Append default trace dir */
488 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
489 sizeof(consumer
->dst
.trace_path
) -
490 strlen(consumer
->dst
.trace_path
) - 1);
491 /* Flag consumer as local. */
492 consumer
->type
= CONSUMER_DST_LOCAL
;
503 * Init tracing by creating trace directory and sending fds kernel consumer.
505 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
508 struct lttng_ht_iter iter
;
509 struct consumer_socket
*socket
;
515 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
516 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
518 pthread_mutex_lock(socket
->lock
);
519 ret
= kernel_consumer_send_session(socket
, session
);
520 pthread_mutex_unlock(socket
->lock
);
522 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
534 * Create a socket to the relayd using the URI.
536 * On success, the relayd_sock pointer is set to the created socket.
537 * Else, it's stays untouched and a lttcomm error code is returned.
539 static int create_connect_relayd(struct lttng_uri
*uri
,
540 struct lttcomm_relayd_sock
**relayd_sock
)
543 struct lttcomm_relayd_sock
*rsock
;
545 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
546 RELAYD_VERSION_COMM_MINOR
);
548 ret
= LTTNG_ERR_FATAL
;
553 * Connect to relayd so we can proceed with a session creation. This call
554 * can possibly block for an arbitrary amount of time to set the health
555 * state to be in poll execution.
558 ret
= relayd_connect(rsock
);
561 ERR("Unable to reach lttng-relayd");
562 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
566 /* Create socket for control stream. */
567 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
568 DBG3("Creating relayd stream socket from URI");
570 /* Check relayd version */
571 ret
= relayd_version_check(rsock
);
573 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
576 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
577 DBG3("Creating relayd data socket from URI");
579 /* Command is not valid */
580 ERR("Relayd invalid stream type: %d", uri
->stype
);
581 ret
= LTTNG_ERR_INVALID
;
585 *relayd_sock
= rsock
;
590 /* The returned value is not useful since we are on an error path. */
591 (void) relayd_close(rsock
);
599 * Connect to the relayd using URI and send the socket to the right consumer.
601 static int send_consumer_relayd_socket(int domain
, unsigned int session_id
,
602 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
603 struct consumer_socket
*consumer_sock
,
604 char *session_name
, char *hostname
, int session_live_timer
)
607 struct lttcomm_relayd_sock
*rsock
= NULL
;
609 /* Connect to relayd and make version check if uri is the control. */
610 ret
= create_connect_relayd(relayd_uri
, &rsock
);
611 if (ret
!= LTTNG_OK
) {
616 /* Set the network sequence index if not set. */
617 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
618 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
620 * Increment net_seq_idx because we are about to transfer the
621 * new relayd socket to the consumer.
622 * Assign unique key so the consumer can match streams.
624 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
625 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
628 /* Send relayd socket to consumer. */
629 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
630 relayd_uri
->stype
, session_id
,
631 session_name
, hostname
, session_live_timer
);
633 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
637 /* Flag that the corresponding socket was sent. */
638 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
639 consumer_sock
->control_sock_sent
= 1;
640 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
641 consumer_sock
->data_sock_sent
= 1;
647 * Close socket which was dup on the consumer side. The session daemon does
648 * NOT keep track of the relayd socket(s) once transfer to the consumer.
652 (void) relayd_close(rsock
);
656 if (ret
!= LTTNG_OK
) {
658 * The consumer output for this session should not be used anymore
659 * since the relayd connection failed thus making any tracing or/and
660 * streaming not usable.
662 consumer
->enabled
= 0;
668 * Send both relayd sockets to a specific consumer and domain. This is a
669 * helper function to facilitate sending the information to the consumer for a
672 static int send_consumer_relayd_sockets(int domain
, unsigned int session_id
,
673 struct consumer_output
*consumer
, struct consumer_socket
*sock
,
674 char *session_name
, char *hostname
, int session_live_timer
)
681 /* Sending control relayd socket. */
682 if (!sock
->control_sock_sent
) {
683 ret
= send_consumer_relayd_socket(domain
, session_id
,
684 &consumer
->dst
.net
.control
, consumer
, sock
,
685 session_name
, hostname
, session_live_timer
);
686 if (ret
!= LTTNG_OK
) {
691 /* Sending data relayd socket. */
692 if (!sock
->data_sock_sent
) {
693 ret
= send_consumer_relayd_socket(domain
, session_id
,
694 &consumer
->dst
.net
.data
, consumer
, sock
,
695 session_name
, hostname
, session_live_timer
);
696 if (ret
!= LTTNG_OK
) {
706 * Setup relayd connections for a tracing session. First creates the socket to
707 * the relayd and send them to the right domain consumer. Consumer type MUST be
710 int cmd_setup_relayd(struct ltt_session
*session
)
713 struct ltt_ust_session
*usess
;
714 struct ltt_kernel_session
*ksess
;
715 struct consumer_socket
*socket
;
716 struct lttng_ht_iter iter
;
720 usess
= session
->ust_session
;
721 ksess
= session
->kernel_session
;
723 DBG("Setting relayd for session %s", session
->name
);
727 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
728 && usess
->consumer
->enabled
) {
729 /* For each consumer socket, send relayd sockets */
730 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
732 pthread_mutex_lock(socket
->lock
);
733 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
->id
,
734 usess
->consumer
, socket
,
735 session
->name
, session
->hostname
,
736 session
->live_timer
);
737 pthread_mutex_unlock(socket
->lock
);
738 if (ret
!= LTTNG_OK
) {
741 /* Session is now ready for network streaming. */
742 session
->net_handle
= 1;
746 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
747 && ksess
->consumer
->enabled
) {
748 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
750 pthread_mutex_lock(socket
->lock
);
751 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
->id
,
752 ksess
->consumer
, socket
,
753 session
->name
, session
->hostname
,
754 session
->live_timer
);
755 pthread_mutex_unlock(socket
->lock
);
756 if (ret
!= LTTNG_OK
) {
759 /* Session is now ready for network streaming. */
760 session
->net_handle
= 1;
770 * Start a kernel session by opening all necessary streams.
772 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
775 struct ltt_kernel_channel
*kchan
;
777 /* Open kernel metadata */
778 if (ksess
->metadata
== NULL
&& ksess
->output_traces
) {
779 ret
= kernel_open_metadata(ksess
);
781 ret
= LTTNG_ERR_KERN_META_FAIL
;
786 /* Open kernel metadata stream */
787 if (ksess
->metadata
&& ksess
->metadata_stream_fd
< 0) {
788 ret
= kernel_open_metadata_stream(ksess
);
790 ERR("Kernel create metadata stream failed");
791 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
796 /* For each channel */
797 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
798 if (kchan
->stream_count
== 0) {
799 ret
= kernel_open_channel_stream(kchan
);
801 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
804 /* Update the stream global counter */
805 ksess
->stream_count_global
+= ret
;
809 /* Setup kernel consumer socket and send fds to it */
810 ret
= init_kernel_tracing(ksess
);
812 ret
= LTTNG_ERR_KERN_START_FAIL
;
816 /* This start the kernel tracing */
817 ret
= kernel_start_session(ksess
);
819 ret
= LTTNG_ERR_KERN_START_FAIL
;
823 /* Quiescent wait after starting trace */
824 kernel_wait_quiescent(kernel_tracer_fd
);
835 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
837 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
841 struct ltt_ust_session
*usess
;
843 usess
= session
->ust_session
;
848 case LTTNG_DOMAIN_KERNEL
:
850 ret
= channel_kernel_disable(session
->kernel_session
,
852 if (ret
!= LTTNG_OK
) {
856 kernel_wait_quiescent(kernel_tracer_fd
);
859 case LTTNG_DOMAIN_UST
:
861 struct ltt_ust_channel
*uchan
;
862 struct lttng_ht
*chan_ht
;
864 chan_ht
= usess
->domain_global
.channels
;
866 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
868 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
872 ret
= channel_ust_disable(usess
, uchan
);
873 if (ret
!= LTTNG_OK
) {
879 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
880 case LTTNG_DOMAIN_UST_EXEC_NAME
:
881 case LTTNG_DOMAIN_UST_PID
:
884 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
896 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
898 * The wpipe arguments is used as a notifier for the kernel thread.
900 int cmd_enable_channel(struct ltt_session
*session
,
901 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
904 struct ltt_ust_session
*usess
= session
->ust_session
;
905 struct lttng_ht
*chan_ht
;
911 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
916 * Don't try to enable a channel if the session has been started at
917 * some point in time before. The tracer does not allow it.
919 if (session
->started
) {
920 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
925 * If the session is a live session, remove the switch timer, the
926 * live timer does the same thing but sends also synchronisation
927 * beacons for inactive streams.
929 if (session
->live_timer
> 0) {
930 attr
->attr
.live_timer_interval
= session
->live_timer
;
931 attr
->attr
.switch_timer_interval
= 0;
935 * The ringbuffer (both in user space and kernel) behave badly in overwrite
936 * mode and with less than 2 subbuf so block it right away and send back an
937 * invalid attribute error.
939 if (attr
->attr
.overwrite
&& attr
->attr
.num_subbuf
< 2) {
940 ret
= LTTNG_ERR_INVALID
;
944 switch (domain
->type
) {
945 case LTTNG_DOMAIN_KERNEL
:
947 struct ltt_kernel_channel
*kchan
;
949 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
950 session
->kernel_session
);
953 * Don't try to create a channel if the session
954 * has been started at some point in time
955 * before. The tracer does not allow it.
957 if (session
->started
) {
958 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
961 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
962 if (attr
->name
[0] != '\0') {
963 session
->kernel_session
->has_non_default_channel
= 1;
966 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
969 if (ret
!= LTTNG_OK
) {
973 kernel_wait_quiescent(kernel_tracer_fd
);
976 case LTTNG_DOMAIN_UST
:
978 struct ltt_ust_channel
*uchan
;
980 chan_ht
= usess
->domain_global
.channels
;
982 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
985 * Don't try to create a channel if the session
986 * has been started at some point in time
987 * before. The tracer does not allow it.
989 if (session
->started
) {
990 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
993 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
994 if (attr
->name
[0] != '\0') {
995 usess
->has_non_default_channel
= 1;
998 ret
= channel_ust_enable(usess
, uchan
);
1003 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1014 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1016 int cmd_disable_event(struct ltt_session
*session
, int domain
,
1017 char *channel_name
, char *event_name
)
1024 case LTTNG_DOMAIN_KERNEL
:
1026 struct ltt_kernel_channel
*kchan
;
1027 struct ltt_kernel_session
*ksess
;
1029 ksess
= session
->kernel_session
;
1032 * If a non-default channel has been created in the
1033 * session, explicitely require that -c chan_name needs
1036 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1037 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1041 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1042 if (kchan
== NULL
) {
1043 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1047 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
1048 if (ret
!= LTTNG_OK
) {
1052 kernel_wait_quiescent(kernel_tracer_fd
);
1055 case LTTNG_DOMAIN_UST
:
1057 struct ltt_ust_channel
*uchan
;
1058 struct ltt_ust_session
*usess
;
1060 usess
= session
->ust_session
;
1063 * If a non-default channel has been created in the
1064 * session, explicitely require that -c chan_name needs
1067 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1068 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1072 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1074 if (uchan
== NULL
) {
1075 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1079 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
1080 if (ret
!= LTTNG_OK
) {
1084 DBG3("Disable UST event %s in channel %s completed", event_name
,
1088 case LTTNG_DOMAIN_JUL
:
1090 struct ltt_ust_session
*usess
= session
->ust_session
;
1094 ret
= event_jul_disable(usess
, event_name
);
1095 if (ret
!= LTTNG_OK
) {
1102 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1103 case LTTNG_DOMAIN_UST_PID
:
1104 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1107 ret
= LTTNG_ERR_UND
;
1119 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1121 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
1129 case LTTNG_DOMAIN_KERNEL
:
1131 struct ltt_kernel_session
*ksess
;
1132 struct ltt_kernel_channel
*kchan
;
1134 ksess
= session
->kernel_session
;
1137 * If a non-default channel has been created in the
1138 * session, explicitely require that -c chan_name needs
1141 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1142 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1146 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1147 if (kchan
== NULL
) {
1148 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1152 ret
= event_kernel_disable_all(kchan
);
1153 if (ret
!= LTTNG_OK
) {
1157 kernel_wait_quiescent(kernel_tracer_fd
);
1160 case LTTNG_DOMAIN_UST
:
1162 struct ltt_ust_session
*usess
;
1163 struct ltt_ust_channel
*uchan
;
1165 usess
= session
->ust_session
;
1168 * If a non-default channel has been created in the
1169 * session, explicitely require that -c chan_name needs
1172 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1173 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1177 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1179 if (uchan
== NULL
) {
1180 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1184 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1189 DBG3("Disable all UST events in channel %s completed", channel_name
);
1193 case LTTNG_DOMAIN_JUL
:
1195 struct ltt_ust_session
*usess
= session
->ust_session
;
1199 ret
= event_jul_disable_all(usess
);
1200 if (ret
!= LTTNG_OK
) {
1207 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1208 case LTTNG_DOMAIN_UST_PID
:
1209 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1212 ret
= LTTNG_ERR_UND
;
1224 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1226 int cmd_add_context(struct ltt_session
*session
, int domain
,
1227 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1229 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1232 case LTTNG_DOMAIN_KERNEL
:
1233 assert(session
->kernel_session
);
1235 if (session
->kernel_session
->channel_count
== 0) {
1236 /* Create default channel */
1237 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1238 if (ret
!= LTTNG_OK
) {
1241 chan_kern_created
= 1;
1243 /* Add kernel context to kernel tracer */
1244 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1245 if (ret
!= LTTNG_OK
) {
1249 case LTTNG_DOMAIN_UST
:
1251 struct ltt_ust_session
*usess
= session
->ust_session
;
1252 unsigned int chan_count
;
1256 chan_count
= lttng_ht_get_count(usess
->domain_global
.channels
);
1257 if (chan_count
== 0) {
1258 struct lttng_channel
*attr
;
1259 /* Create default channel */
1260 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1262 ret
= LTTNG_ERR_FATAL
;
1266 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1267 if (ret
!= LTTNG_OK
) {
1272 chan_ust_created
= 1;
1275 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1276 if (ret
!= LTTNG_OK
) {
1282 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1283 case LTTNG_DOMAIN_UST_PID
:
1284 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1287 ret
= LTTNG_ERR_UND
;
1294 if (chan_kern_created
) {
1295 struct ltt_kernel_channel
*kchan
=
1296 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1297 session
->kernel_session
);
1298 /* Created previously, this should NOT fail. */
1300 kernel_destroy_channel(kchan
);
1303 if (chan_ust_created
) {
1304 struct ltt_ust_channel
*uchan
=
1305 trace_ust_find_channel_by_name(
1306 session
->ust_session
->domain_global
.channels
,
1307 DEFAULT_CHANNEL_NAME
);
1308 /* Created previously, this should NOT fail. */
1310 /* Remove from the channel list of the session. */
1311 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1313 trace_ust_destroy_channel(uchan
);
1319 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1321 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1322 char *channel_name
, struct lttng_event
*event
,
1323 struct lttng_filter_bytecode
*filter
,
1324 struct lttng_event_exclusion
*exclusion
,
1327 int ret
, channel_created
= 0;
1328 struct lttng_channel
*attr
;
1332 assert(channel_name
);
1336 switch (domain
->type
) {
1337 case LTTNG_DOMAIN_KERNEL
:
1339 struct ltt_kernel_channel
*kchan
;
1342 * If a non-default channel has been created in the
1343 * session, explicitely require that -c chan_name needs
1346 if (session
->kernel_session
->has_non_default_channel
1347 && channel_name
[0] == '\0') {
1348 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1352 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1353 session
->kernel_session
);
1354 if (kchan
== NULL
) {
1355 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1356 LTTNG_BUFFER_GLOBAL
);
1358 ret
= LTTNG_ERR_FATAL
;
1361 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1363 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1364 if (ret
!= LTTNG_OK
) {
1370 channel_created
= 1;
1373 /* Get the newly created kernel channel pointer */
1374 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1375 session
->kernel_session
);
1376 if (kchan
== NULL
) {
1377 /* This sould not happen... */
1378 ret
= LTTNG_ERR_FATAL
;
1382 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1383 if (ret
!= LTTNG_OK
) {
1384 if (channel_created
) {
1385 /* Let's not leak a useless channel. */
1386 kernel_destroy_channel(kchan
);
1391 kernel_wait_quiescent(kernel_tracer_fd
);
1394 case LTTNG_DOMAIN_UST
:
1396 struct ltt_ust_channel
*uchan
;
1397 struct ltt_ust_session
*usess
= session
->ust_session
;
1402 * If a non-default channel has been created in the
1403 * session, explicitely require that -c chan_name needs
1406 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1407 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1411 /* Get channel from global UST domain */
1412 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1414 if (uchan
== NULL
) {
1415 /* Create default channel */
1416 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1417 usess
->buffer_type
);
1419 ret
= LTTNG_ERR_FATAL
;
1422 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1424 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1425 if (ret
!= LTTNG_OK
) {
1431 /* Get the newly created channel reference back */
1432 uchan
= trace_ust_find_channel_by_name(
1433 usess
->domain_global
.channels
, channel_name
);
1437 /* At this point, the session and channel exist on the tracer */
1438 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
, filter
, exclusion
);
1439 if (ret
!= LTTNG_OK
) {
1444 case LTTNG_DOMAIN_JUL
:
1446 struct lttng_event uevent
;
1447 struct lttng_domain tmp_dom
;
1448 struct ltt_ust_session
*usess
= session
->ust_session
;
1452 /* Create the default JUL tracepoint. */
1453 memset(&uevent
, 0, sizeof(uevent
));
1454 uevent
.type
= LTTNG_EVENT_TRACEPOINT
;
1455 uevent
.loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
1457 strncpy(uevent
.name
, DEFAULT_SYS_JUL_EVENT_NAME
,
1458 sizeof(uevent
.name
));
1460 strncpy(uevent
.name
, DEFAULT_USER_JUL_EVENT_NAME
,
1461 sizeof(uevent
.name
));
1463 uevent
.name
[sizeof(uevent
.name
) - 1] = '\0';
1466 * The domain type is changed because we are about to enable the
1467 * default channel and event for the JUL domain that are hardcoded.
1468 * This happens in the UST domain.
1470 memcpy(&tmp_dom
, domain
, sizeof(tmp_dom
));
1471 tmp_dom
.type
= LTTNG_DOMAIN_UST
;
1473 ret
= cmd_enable_event(session
, &tmp_dom
, DEFAULT_JUL_CHANNEL_NAME
,
1474 &uevent
, filter
, NULL
, wpipe
);
1475 if (ret
!= LTTNG_OK
&& ret
!= LTTNG_ERR_UST_EVENT_ENABLED
) {
1479 /* The wild card * means that everything should be enabled. */
1480 if (strncmp(event
->name
, "*", 1) == 0 && strlen(event
->name
) == 1) {
1481 ret
= event_jul_enable_all(usess
, event
);
1483 ret
= event_jul_enable(usess
, event
);
1485 if (ret
!= LTTNG_OK
) {
1492 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1493 case LTTNG_DOMAIN_UST_PID
:
1494 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1497 ret
= LTTNG_ERR_UND
;
1509 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1511 int cmd_enable_event_all(struct ltt_session
*session
,
1512 struct lttng_domain
*domain
, char *channel_name
, int event_type
,
1513 struct lttng_filter_bytecode
*filter
, int wpipe
)
1516 struct lttng_channel
*attr
;
1519 assert(channel_name
);
1523 switch (domain
->type
) {
1524 case LTTNG_DOMAIN_KERNEL
:
1526 struct ltt_kernel_channel
*kchan
;
1528 assert(session
->kernel_session
);
1531 * If a non-default channel has been created in the
1532 * session, explicitely require that -c chan_name needs
1535 if (session
->kernel_session
->has_non_default_channel
1536 && channel_name
[0] == '\0') {
1537 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1541 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1542 session
->kernel_session
);
1543 if (kchan
== NULL
) {
1544 /* Create default channel */
1545 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1546 LTTNG_BUFFER_GLOBAL
);
1548 ret
= LTTNG_ERR_FATAL
;
1551 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1553 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1554 if (ret
!= LTTNG_OK
) {
1560 /* Get the newly created kernel channel pointer */
1561 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1562 session
->kernel_session
);
1566 switch (event_type
) {
1567 case LTTNG_EVENT_SYSCALL
:
1568 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1570 case LTTNG_EVENT_TRACEPOINT
:
1572 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1573 * events already registered to the channel.
1575 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1577 case LTTNG_EVENT_ALL
:
1578 /* Enable syscalls and tracepoints */
1579 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1582 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1586 /* Manage return value */
1587 if (ret
!= LTTNG_OK
) {
1589 * On error, cmd_enable_channel call will take care of destroying
1590 * the created channel if it was needed.
1595 kernel_wait_quiescent(kernel_tracer_fd
);
1598 case LTTNG_DOMAIN_UST
:
1600 struct ltt_ust_channel
*uchan
;
1601 struct ltt_ust_session
*usess
= session
->ust_session
;
1606 * If a non-default channel has been created in the
1607 * session, explicitely require that -c chan_name needs
1610 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1611 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1615 /* Get channel from global UST domain */
1616 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1618 if (uchan
== NULL
) {
1619 /* Create default channel */
1620 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1621 usess
->buffer_type
);
1623 ret
= LTTNG_ERR_FATAL
;
1626 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1628 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1629 if (ret
!= LTTNG_OK
) {
1635 /* Get the newly created channel reference back */
1636 uchan
= trace_ust_find_channel_by_name(
1637 usess
->domain_global
.channels
, channel_name
);
1641 /* At this point, the session and channel exist on the tracer */
1643 switch (event_type
) {
1644 case LTTNG_EVENT_ALL
:
1645 case LTTNG_EVENT_TRACEPOINT
:
1646 ret
= event_ust_enable_all_tracepoints(usess
, uchan
, filter
);
1647 if (ret
!= LTTNG_OK
) {
1652 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1656 /* Manage return value */
1657 if (ret
!= LTTNG_OK
) {
1663 case LTTNG_DOMAIN_JUL
:
1665 struct lttng_event uevent
, event
;
1666 struct lttng_domain tmp_dom
;
1667 struct ltt_ust_session
*usess
= session
->ust_session
;
1671 /* Create the default JUL tracepoint. */
1672 uevent
.type
= LTTNG_EVENT_TRACEPOINT
;
1673 uevent
.loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
1675 strncpy(uevent
.name
, DEFAULT_SYS_JUL_EVENT_NAME
,
1676 sizeof(uevent
.name
));
1678 strncpy(uevent
.name
, DEFAULT_USER_JUL_EVENT_NAME
,
1679 sizeof(uevent
.name
));
1681 uevent
.name
[sizeof(uevent
.name
) - 1] = '\0';
1684 * The domain type is changed because we are about to enable the
1685 * default channel and event for the JUL domain that are hardcoded.
1686 * This happens in the UST domain.
1688 memcpy(&tmp_dom
, domain
, sizeof(tmp_dom
));
1689 tmp_dom
.type
= LTTNG_DOMAIN_UST
;
1691 ret
= cmd_enable_event(session
, &tmp_dom
, DEFAULT_JUL_CHANNEL_NAME
,
1692 &uevent
, NULL
, NULL
, wpipe
);
1693 if (ret
!= LTTNG_OK
&& ret
!= LTTNG_ERR_UST_EVENT_ENABLED
) {
1697 event
.loglevel
= LTTNG_LOGLEVEL_JUL_ALL
;
1698 event
.loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
1699 strncpy(event
.name
, "*", sizeof(event
.name
));
1700 event
.name
[sizeof(event
.name
) - 1] = '\0';
1702 ret
= event_jul_enable_all(usess
, &event
);
1703 if (ret
!= LTTNG_OK
) {
1710 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1711 case LTTNG_DOMAIN_UST_PID
:
1712 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1715 ret
= LTTNG_ERR_UND
;
1728 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1730 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1733 ssize_t nb_events
= 0;
1736 case LTTNG_DOMAIN_KERNEL
:
1737 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1738 if (nb_events
< 0) {
1739 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1743 case LTTNG_DOMAIN_UST
:
1744 nb_events
= ust_app_list_events(events
);
1745 if (nb_events
< 0) {
1746 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1750 case LTTNG_DOMAIN_JUL
:
1751 nb_events
= jul_list_events(events
);
1752 if (nb_events
< 0) {
1753 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1758 ret
= LTTNG_ERR_UND
;
1765 /* Return negative value to differentiate return code */
1770 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1772 ssize_t
cmd_list_tracepoint_fields(int domain
,
1773 struct lttng_event_field
**fields
)
1776 ssize_t nb_fields
= 0;
1779 case LTTNG_DOMAIN_UST
:
1780 nb_fields
= ust_app_list_event_fields(fields
);
1781 if (nb_fields
< 0) {
1782 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1786 case LTTNG_DOMAIN_KERNEL
:
1787 default: /* fall-through */
1788 ret
= LTTNG_ERR_UND
;
1795 /* Return negative value to differentiate return code */
1800 * Command LTTNG_START_TRACE processed by the client thread.
1802 int cmd_start_trace(struct ltt_session
*session
)
1805 unsigned long nb_chan
= 0;
1806 struct ltt_kernel_session
*ksession
;
1807 struct ltt_ust_session
*usess
;
1811 /* Ease our life a bit ;) */
1812 ksession
= session
->kernel_session
;
1813 usess
= session
->ust_session
;
1815 if (session
->enabled
) {
1816 /* Already started. */
1817 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1822 * Starting a session without channel is useless since after that it's not
1823 * possible to enable channel thus inform the client.
1825 if (usess
&& usess
->domain_global
.channels
) {
1826 nb_chan
+= lttng_ht_get_count(usess
->domain_global
.channels
);
1829 nb_chan
+= ksession
->channel_count
;
1832 ret
= LTTNG_ERR_NO_CHANNEL
;
1836 session
->enabled
= 1;
1838 /* Kernel tracing */
1839 if (ksession
!= NULL
) {
1840 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1841 if (ret
!= LTTNG_OK
) {
1846 /* Flag session that trace should start automatically */
1848 usess
->start_trace
= 1;
1850 ret
= ust_app_start_trace_all(usess
);
1852 ret
= LTTNG_ERR_UST_START_FAIL
;
1857 session
->started
= 1;
1866 * Command LTTNG_STOP_TRACE processed by the client thread.
1868 int cmd_stop_trace(struct ltt_session
*session
)
1871 struct ltt_kernel_channel
*kchan
;
1872 struct ltt_kernel_session
*ksession
;
1873 struct ltt_ust_session
*usess
;
1878 ksession
= session
->kernel_session
;
1879 usess
= session
->ust_session
;
1881 if (!session
->enabled
) {
1882 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1886 session
->enabled
= 0;
1889 if (ksession
&& ksession
->started
) {
1890 DBG("Stop kernel tracing");
1892 /* Flush metadata if exist */
1893 if (ksession
->metadata_stream_fd
>= 0) {
1894 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1896 ERR("Kernel metadata flush failed");
1900 /* Flush all buffers before stopping */
1901 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1902 ret
= kernel_flush_buffer(kchan
);
1904 ERR("Kernel flush buffer error");
1908 ret
= kernel_stop_session(ksession
);
1910 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1914 kernel_wait_quiescent(kernel_tracer_fd
);
1916 ksession
->started
= 0;
1919 if (usess
&& usess
->start_trace
) {
1920 usess
->start_trace
= 0;
1922 ret
= ust_app_stop_trace_all(usess
);
1924 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1936 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1938 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1939 size_t nb_uri
, struct lttng_uri
*uris
)
1942 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1943 struct ltt_ust_session
*usess
= session
->ust_session
;
1944 struct consumer_output
*consumer
= NULL
;
1950 /* Can't enable consumer after session started. */
1951 if (session
->enabled
) {
1952 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1957 * This case switch makes sure the domain session has a temporary consumer
1958 * so the URL can be set.
1962 /* Code flow error. A session MUST always have a consumer object */
1963 assert(session
->consumer
);
1965 * The URL will be added to the tracing session consumer instead of a
1966 * specific domain consumer.
1968 consumer
= session
->consumer
;
1970 case LTTNG_DOMAIN_KERNEL
:
1971 /* Code flow error if we don't have a kernel session here. */
1973 assert(ksess
->consumer
);
1974 consumer
= ksess
->consumer
;
1976 case LTTNG_DOMAIN_UST
:
1977 /* Code flow error if we don't have a kernel session here. */
1979 assert(usess
->consumer
);
1980 consumer
= usess
->consumer
;
1984 for (i
= 0; i
< nb_uri
; i
++) {
1985 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1986 if (ret
!= LTTNG_OK
) {
1999 * Command LTTNG_CREATE_SESSION processed by the client thread.
2001 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
2002 size_t nb_uri
, lttng_sock_cred
*creds
, unsigned int live_timer
)
2005 struct ltt_session
*session
;
2011 * Verify if the session already exist
2013 * XXX: There is no need for the session lock list here since the caller
2014 * (process_client_msg) is holding it. We might want to change that so a
2015 * single command does not lock the entire session list.
2017 session
= session_find_by_name(name
);
2018 if (session
!= NULL
) {
2019 ret
= LTTNG_ERR_EXIST_SESS
;
2023 /* Create tracing session in the registry */
2024 ret
= session_create(name
, LTTNG_SOCK_GET_UID_CRED(creds
),
2025 LTTNG_SOCK_GET_GID_CRED(creds
));
2026 if (ret
!= LTTNG_OK
) {
2031 * Get the newly created session pointer back
2033 * XXX: There is no need for the session lock list here since the caller
2034 * (process_client_msg) is holding it. We might want to change that so a
2035 * single command does not lock the entire session list.
2037 session
= session_find_by_name(name
);
2040 session
->live_timer
= live_timer
;
2041 /* Create default consumer output for the session not yet created. */
2042 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
2043 if (session
->consumer
== NULL
) {
2044 ret
= LTTNG_ERR_FATAL
;
2045 goto consumer_error
;
2049 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
2050 if (ret
!= LTTNG_OK
) {
2051 goto consumer_error
;
2053 session
->output_traces
= 1;
2055 session
->output_traces
= 0;
2056 DBG2("Session %s created with no output", session
->name
);
2059 session
->consumer
->enabled
= 1;
2064 session_destroy(session
);
2071 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2073 int cmd_create_session_snapshot(char *name
, struct lttng_uri
*uris
,
2074 size_t nb_uri
, lttng_sock_cred
*creds
)
2077 struct ltt_session
*session
;
2078 struct snapshot_output
*new_output
= NULL
;
2084 * Create session in no output mode with URIs set to NULL. The uris we've
2085 * received are for a default snapshot output if one.
2087 ret
= cmd_create_session_uri(name
, NULL
, 0, creds
, -1);
2088 if (ret
!= LTTNG_OK
) {
2092 /* Get the newly created session pointer back. This should NEVER fail. */
2093 session
= session_find_by_name(name
);
2096 /* Flag session for snapshot mode. */
2097 session
->snapshot_mode
= 1;
2099 /* Skip snapshot output creation if no URI is given. */
2104 new_output
= snapshot_output_alloc();
2106 ret
= LTTNG_ERR_NOMEM
;
2107 goto error_snapshot_alloc
;
2110 ret
= snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE
, NULL
,
2111 uris
, nb_uri
, session
->consumer
, new_output
, &session
->snapshot
);
2113 if (ret
== -ENOMEM
) {
2114 ret
= LTTNG_ERR_NOMEM
;
2116 ret
= LTTNG_ERR_INVALID
;
2118 goto error_snapshot
;
2122 snapshot_add_output(&session
->snapshot
, new_output
);
2129 snapshot_output_destroy(new_output
);
2130 error_snapshot_alloc
:
2131 session_destroy(session
);
2137 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2139 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
2142 struct ltt_ust_session
*usess
;
2143 struct ltt_kernel_session
*ksess
;
2148 usess
= session
->ust_session
;
2149 ksess
= session
->kernel_session
;
2151 /* Clean kernel session teardown */
2152 kernel_destroy_session(ksess
);
2154 /* UST session teardown */
2156 /* Close any relayd session */
2157 consumer_output_send_destroy_relayd(usess
->consumer
);
2159 /* Destroy every UST application related to this session. */
2160 ret
= ust_app_destroy_trace_all(usess
);
2162 ERR("Error in ust_app_destroy_trace_all");
2165 /* Clean up the rest. */
2166 trace_ust_destroy_session(usess
);
2170 * Must notify the kernel thread here to update it's poll set in order to
2171 * remove the channel(s)' fd just destroyed.
2173 ret
= notify_thread_pipe(wpipe
);
2175 PERROR("write kernel poll pipe");
2178 ret
= session_destroy(session
);
2184 * Command LTTNG_CALIBRATE processed by the client thread.
2186 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
2191 case LTTNG_DOMAIN_KERNEL
:
2193 struct lttng_kernel_calibrate kcalibrate
;
2195 switch (calibrate
->type
) {
2196 case LTTNG_CALIBRATE_FUNCTION
:
2198 /* Default and only possible calibrate option. */
2199 kcalibrate
.type
= LTTNG_KERNEL_CALIBRATE_KRETPROBE
;
2203 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2205 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
2210 case LTTNG_DOMAIN_UST
:
2212 struct lttng_ust_calibrate ucalibrate
;
2214 switch (calibrate
->type
) {
2215 case LTTNG_CALIBRATE_FUNCTION
:
2217 /* Default and only possible calibrate option. */
2218 ucalibrate
.type
= LTTNG_UST_CALIBRATE_TRACEPOINT
;
2222 ret
= ust_app_calibrate_glb(&ucalibrate
);
2224 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
2230 ret
= LTTNG_ERR_UND
;
2241 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2243 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2244 const char *sock_path
, struct consumer_data
*cdata
)
2247 struct consumer_socket
*socket
= NULL
;
2254 case LTTNG_DOMAIN_KERNEL
:
2256 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2260 /* Can't register a consumer if there is already one */
2261 if (ksess
->consumer_fds_sent
!= 0) {
2262 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2266 sock
= lttcomm_connect_unix_sock(sock_path
);
2268 ret
= LTTNG_ERR_CONNECT_FAIL
;
2271 cdata
->cmd_sock
= sock
;
2273 socket
= consumer_allocate_socket(&cdata
->cmd_sock
);
2274 if (socket
== NULL
) {
2277 PERROR("close register consumer");
2279 cdata
->cmd_sock
= -1;
2280 ret
= LTTNG_ERR_FATAL
;
2284 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
2285 if (socket
->lock
== NULL
) {
2286 PERROR("zmalloc pthread mutex");
2287 ret
= LTTNG_ERR_FATAL
;
2290 pthread_mutex_init(socket
->lock
, NULL
);
2291 socket
->registered
= 1;
2294 consumer_add_socket(socket
, ksess
->consumer
);
2297 pthread_mutex_lock(&cdata
->pid_mutex
);
2299 pthread_mutex_unlock(&cdata
->pid_mutex
);
2304 /* TODO: Userspace tracing */
2305 ret
= LTTNG_ERR_UND
;
2313 consumer_destroy_socket(socket
);
2319 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2321 ssize_t
cmd_list_domains(struct ltt_session
*session
,
2322 struct lttng_domain
**domains
)
2327 if (session
->kernel_session
!= NULL
) {
2328 DBG3("Listing domains found kernel domain");
2332 if (session
->ust_session
!= NULL
) {
2333 DBG3("Listing domains found UST global domain");
2336 if (session
->ust_session
->domain_jul
.being_used
) {
2341 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2342 if (*domains
== NULL
) {
2343 ret
= LTTNG_ERR_FATAL
;
2347 if (session
->kernel_session
!= NULL
) {
2348 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2352 if (session
->ust_session
!= NULL
) {
2353 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2354 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2357 if (session
->ust_session
->domain_jul
.being_used
) {
2358 (*domains
)[index
].type
= LTTNG_DOMAIN_JUL
;
2359 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2367 /* Return negative value to differentiate return code */
2373 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2375 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
2376 struct lttng_channel
**channels
)
2379 ssize_t nb_chan
= 0;
2382 case LTTNG_DOMAIN_KERNEL
:
2383 if (session
->kernel_session
!= NULL
) {
2384 nb_chan
= session
->kernel_session
->channel_count
;
2386 DBG3("Number of kernel channels %zd", nb_chan
);
2388 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2391 case LTTNG_DOMAIN_UST
:
2392 if (session
->ust_session
!= NULL
) {
2393 nb_chan
= lttng_ht_get_count(
2394 session
->ust_session
->domain_global
.channels
);
2396 DBG3("Number of UST global channels %zd", nb_chan
);
2398 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2403 ret
= LTTNG_ERR_UND
;
2408 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2409 if (*channels
== NULL
) {
2410 ret
= LTTNG_ERR_FATAL
;
2414 list_lttng_channels(domain
, session
, *channels
);
2417 /* Ret value was set in the domain switch case */
2424 /* Return negative value to differentiate return code */
2429 * Command LTTNG_LIST_EVENTS processed by the client thread.
2431 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2432 char *channel_name
, struct lttng_event
**events
)
2435 ssize_t nb_event
= 0;
2438 case LTTNG_DOMAIN_KERNEL
:
2439 if (session
->kernel_session
!= NULL
) {
2440 nb_event
= list_lttng_kernel_events(channel_name
,
2441 session
->kernel_session
, events
);
2444 case LTTNG_DOMAIN_UST
:
2446 if (session
->ust_session
!= NULL
) {
2447 nb_event
= list_lttng_ust_global_events(channel_name
,
2448 &session
->ust_session
->domain_global
, events
);
2452 case LTTNG_DOMAIN_JUL
:
2453 if (session
->ust_session
) {
2454 nb_event
= list_lttng_jul_events(
2455 &session
->ust_session
->domain_jul
, events
);
2459 ret
= LTTNG_ERR_UND
;
2466 /* Return negative value to differentiate return code */
2471 * Using the session list, filled a lttng_session array to send back to the
2472 * client for session listing.
2474 * The session list lock MUST be acquired before calling this function. Use
2475 * session_lock_list() and session_unlock_list().
2477 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2482 struct ltt_session
*session
;
2483 struct ltt_session_list
*list
= session_get_list();
2485 DBG("Getting all available session for UID %d GID %d",
2488 * Iterate over session list and append data after the control struct in
2491 cds_list_for_each_entry(session
, &list
->head
, list
) {
2493 * Only list the sessions the user can control.
2495 if (!session_access_ok(session
, uid
, gid
)) {
2499 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2500 struct ltt_ust_session
*usess
= session
->ust_session
;
2502 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2503 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2504 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2505 ret
= build_network_session_path(sessions
[i
].path
,
2506 sizeof(sessions
[i
].path
), session
);
2508 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
2509 session
->consumer
->dst
.trace_path
);
2512 PERROR("snprintf session path");
2516 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2517 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2518 sessions
[i
].enabled
= session
->enabled
;
2519 sessions
[i
].snapshot_mode
= session
->snapshot_mode
;
2520 sessions
[i
].live_timer_interval
= session
->live_timer
;
2526 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2527 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2529 int cmd_data_pending(struct ltt_session
*session
)
2532 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2533 struct ltt_ust_session
*usess
= session
->ust_session
;
2537 /* Session MUST be stopped to ask for data availability. */
2538 if (session
->enabled
) {
2539 ret
= LTTNG_ERR_SESSION_STARTED
;
2543 * If stopped, just make sure we've started before else the above call
2544 * will always send that there is data pending.
2546 * The consumer assumes that when the data pending command is received,
2547 * the trace has been started before or else no output data is written
2548 * by the streams which is a condition for data pending. So, this is
2549 * *VERY* important that we don't ask the consumer before a start
2552 if (!session
->started
) {
2558 if (ksess
&& ksess
->consumer
) {
2559 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2561 /* Data is still being extracted for the kernel. */
2566 if (usess
&& usess
->consumer
) {
2567 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2569 /* Data is still being extracted for the kernel. */
2574 /* Data is ready to be read by a viewer */
2582 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2584 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2586 int cmd_snapshot_add_output(struct ltt_session
*session
,
2587 struct lttng_snapshot_output
*output
, uint32_t *id
)
2590 struct snapshot_output
*new_output
;
2595 DBG("Cmd snapshot add output for session %s", session
->name
);
2598 * Permission denied to create an output if the session is not
2599 * set in no output mode.
2601 if (session
->output_traces
) {
2602 ret
= LTTNG_ERR_EPERM
;
2606 /* Only one output is allowed until we have the "tee" feature. */
2607 if (session
->snapshot
.nb_output
== 1) {
2608 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
2612 new_output
= snapshot_output_alloc();
2614 ret
= LTTNG_ERR_NOMEM
;
2618 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2619 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
2620 &session
->snapshot
);
2622 if (ret
== -ENOMEM
) {
2623 ret
= LTTNG_ERR_NOMEM
;
2625 ret
= LTTNG_ERR_INVALID
;
2631 snapshot_add_output(&session
->snapshot
, new_output
);
2633 *id
= new_output
->id
;
2640 snapshot_output_destroy(new_output
);
2646 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2648 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2650 int cmd_snapshot_del_output(struct ltt_session
*session
,
2651 struct lttng_snapshot_output
*output
)
2654 struct snapshot_output
*sout
= NULL
;
2662 * Permission denied to create an output if the session is not
2663 * set in no output mode.
2665 if (session
->output_traces
) {
2666 ret
= LTTNG_ERR_EPERM
;
2671 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
2673 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
2674 } else if (*output
->name
!= '\0') {
2675 DBG("Cmd snapshot del output name %s for session %s", output
->name
,
2677 sout
= snapshot_find_output_by_name(output
->name
, &session
->snapshot
);
2680 ret
= LTTNG_ERR_INVALID
;
2684 snapshot_delete_output(&session
->snapshot
, sout
);
2685 snapshot_output_destroy(sout
);
2694 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2696 * If no output is available, outputs is untouched and 0 is returned.
2698 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2700 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
2701 struct lttng_snapshot_output
**outputs
)
2704 struct lttng_snapshot_output
*list
;
2705 struct lttng_ht_iter iter
;
2706 struct snapshot_output
*output
;
2711 DBG("Cmd snapshot list outputs for session %s", session
->name
);
2714 * Permission denied to create an output if the session is not
2715 * set in no output mode.
2717 if (session
->output_traces
) {
2718 ret
= LTTNG_ERR_EPERM
;
2722 if (session
->snapshot
.nb_output
== 0) {
2727 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
2729 ret
= LTTNG_ERR_NOMEM
;
2733 /* Copy list from session to the new list object. */
2734 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
2735 output
, node
.node
) {
2736 assert(output
->consumer
);
2737 list
[idx
].id
= output
->id
;
2738 list
[idx
].max_size
= output
->max_size
;
2739 strncpy(list
[idx
].name
, output
->name
, sizeof(list
[idx
].name
));
2740 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
2741 strncpy(list
[idx
].ctrl_url
, output
->consumer
->dst
.trace_path
,
2742 sizeof(list
[idx
].ctrl_url
));
2745 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
2746 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
2748 ret
= LTTNG_ERR_NOMEM
;
2753 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
2754 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
2756 ret
= LTTNG_ERR_NOMEM
;
2764 return session
->snapshot
.nb_output
;
2773 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2774 * snapshot output is *not* set with a remote destination.
2776 * Return 0 on success or a LTTNG_ERR code.
2778 static int set_relayd_for_snapshot(struct consumer_output
*consumer
,
2779 struct snapshot_output
*snap_output
, struct ltt_session
*session
)
2782 struct lttng_ht_iter iter
;
2783 struct consumer_socket
*socket
;
2786 assert(snap_output
);
2789 DBG2("Set relayd object from snapshot output");
2791 /* Ignore if snapshot consumer output is not network. */
2792 if (snap_output
->consumer
->type
!= CONSUMER_DST_NET
) {
2797 * For each consumer socket, create and send the relayd object of the
2801 cds_lfht_for_each_entry(snap_output
->consumer
->socks
->ht
, &iter
.iter
,
2802 socket
, node
.node
) {
2803 ret
= send_consumer_relayd_sockets(0, session
->id
,
2804 snap_output
->consumer
, socket
,
2805 session
->name
, session
->hostname
,
2806 session
->live_timer
);
2807 if (ret
!= LTTNG_OK
) {
2819 * Record a kernel snapshot.
2821 * Return LTTNG_OK on success or a LTTNG_ERR code.
2823 static int record_kernel_snapshot(struct ltt_kernel_session
*ksess
,
2824 struct snapshot_output
*output
, struct ltt_session
*session
,
2825 int wait
, int nb_streams
)
2833 /* Get the datetime for the snapshot output directory. */
2834 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
2835 sizeof(output
->datetime
));
2837 ret
= LTTNG_ERR_INVALID
;
2842 * Copy kernel session sockets so we can communicate with the right
2843 * consumer for the snapshot record command.
2845 ret
= consumer_copy_sockets(output
->consumer
, ksess
->consumer
);
2847 ret
= LTTNG_ERR_NOMEM
;
2851 ret
= set_relayd_for_snapshot(ksess
->consumer
, output
, session
);
2852 if (ret
!= LTTNG_OK
) {
2853 goto error_snapshot
;
2856 ret
= kernel_snapshot_record(ksess
, output
, wait
, nb_streams
);
2857 if (ret
!= LTTNG_OK
) {
2858 goto error_snapshot
;
2864 /* Clean up copied sockets so this output can use some other later on. */
2865 consumer_destroy_output_sockets(output
->consumer
);
2871 * Record a UST snapshot.
2873 * Return 0 on success or a LTTNG_ERR error code.
2875 static int record_ust_snapshot(struct ltt_ust_session
*usess
,
2876 struct snapshot_output
*output
, struct ltt_session
*session
,
2877 int wait
, int nb_streams
)
2885 /* Get the datetime for the snapshot output directory. */
2886 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
2887 sizeof(output
->datetime
));
2889 ret
= LTTNG_ERR_INVALID
;
2894 * Copy UST session sockets so we can communicate with the right
2895 * consumer for the snapshot record command.
2897 ret
= consumer_copy_sockets(output
->consumer
, usess
->consumer
);
2899 ret
= LTTNG_ERR_NOMEM
;
2903 ret
= set_relayd_for_snapshot(usess
->consumer
, output
, session
);
2904 if (ret
!= LTTNG_OK
) {
2905 goto error_snapshot
;
2908 ret
= ust_app_snapshot_record(usess
, output
, wait
, nb_streams
);
2912 ret
= LTTNG_ERR_INVALID
;
2915 ret
= LTTNG_ERR_SNAPSHOT_NODATA
;
2918 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
2921 goto error_snapshot
;
2927 /* Clean up copied sockets so this output can use some other later on. */
2928 consumer_destroy_output_sockets(output
->consumer
);
2934 * Returns the total number of streams for a session or a negative value
2937 static unsigned int get_total_nb_stream(struct ltt_session
*session
)
2939 unsigned int total_streams
= 0;
2941 if (session
->kernel_session
) {
2942 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2944 total_streams
+= ksess
->stream_count_global
;
2947 if (session
->ust_session
) {
2948 struct ltt_ust_session
*usess
= session
->ust_session
;
2950 total_streams
+= ust_app_get_nb_stream(usess
);
2953 return total_streams
;
2957 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2959 * The wait parameter is ignored so this call always wait for the snapshot to
2960 * complete before returning.
2962 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2964 int cmd_snapshot_record(struct ltt_session
*session
,
2965 struct lttng_snapshot_output
*output
, int wait
)
2968 unsigned int use_tmp_output
= 0;
2969 struct snapshot_output tmp_output
;
2970 unsigned int nb_streams
, snapshot_success
= 0;
2974 DBG("Cmd snapshot record for session %s", session
->name
);
2977 * Permission denied to create an output if the session is not
2978 * set in no output mode.
2980 if (session
->output_traces
) {
2981 ret
= LTTNG_ERR_EPERM
;
2985 /* The session needs to be started at least once. */
2986 if (!session
->started
) {
2987 ret
= LTTNG_ERR_START_SESSION_ONCE
;
2991 /* Use temporary output for the session. */
2992 if (output
&& *output
->ctrl_url
!= '\0') {
2993 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2994 output
->ctrl_url
, output
->data_url
, session
->consumer
,
2997 if (ret
== -ENOMEM
) {
2998 ret
= LTTNG_ERR_NOMEM
;
3000 ret
= LTTNG_ERR_INVALID
;
3004 /* Use the global session count for the temporary snapshot. */
3005 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3010 * Get the total number of stream of that session which is used by the
3011 * maximum size of the snapshot feature.
3013 nb_streams
= get_total_nb_stream(session
);
3015 if (session
->kernel_session
) {
3016 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3018 if (use_tmp_output
) {
3019 ret
= record_kernel_snapshot(ksess
, &tmp_output
, session
,
3021 if (ret
!= LTTNG_OK
) {
3024 snapshot_success
= 1;
3026 struct snapshot_output
*sout
;
3027 struct lttng_ht_iter iter
;
3030 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
3031 &iter
.iter
, sout
, node
.node
) {
3033 * Make a local copy of the output and assign the possible
3034 * temporary value given by the caller.
3036 memset(&tmp_output
, 0, sizeof(tmp_output
));
3037 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
3039 /* Use temporary max size. */
3040 if (output
->max_size
!= (uint64_t) -1ULL) {
3041 tmp_output
.max_size
= output
->max_size
;
3044 /* Use temporary name. */
3045 if (*output
->name
!= '\0') {
3046 strncpy(tmp_output
.name
, output
->name
,
3047 sizeof(tmp_output
.name
));
3050 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3052 ret
= record_kernel_snapshot(ksess
, &tmp_output
,
3053 session
, wait
, nb_streams
);
3054 if (ret
!= LTTNG_OK
) {
3058 snapshot_success
= 1;
3064 if (session
->ust_session
) {
3065 struct ltt_ust_session
*usess
= session
->ust_session
;
3067 if (use_tmp_output
) {
3068 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
3070 if (ret
!= LTTNG_OK
) {
3073 snapshot_success
= 1;
3075 struct snapshot_output
*sout
;
3076 struct lttng_ht_iter iter
;
3079 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
3080 &iter
.iter
, sout
, node
.node
) {
3082 * Make a local copy of the output and assign the possible
3083 * temporary value given by the caller.
3085 memset(&tmp_output
, 0, sizeof(tmp_output
));
3086 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
3088 /* Use temporary max size. */
3089 if (output
->max_size
!= (uint64_t) -1ULL) {
3090 tmp_output
.max_size
= output
->max_size
;
3093 /* Use temporary name. */
3094 if (*output
->name
!= '\0') {
3095 strncpy(tmp_output
.name
, output
->name
,
3096 sizeof(tmp_output
.name
));
3099 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3101 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
3103 if (ret
!= LTTNG_OK
) {
3107 snapshot_success
= 1;
3113 if (snapshot_success
) {
3114 session
->snapshot
.nb_snapshot
++;
3116 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
3124 * Init command subsystem.
3129 * Set network sequence index to 1 for streams to match a relayd
3130 * socket on the consumer side.
3132 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
3133 relayd_net_seq_idx
= 1;
3134 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
3136 DBG("Command subsystem initialized");