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;
934 switch (domain
->type
) {
935 case LTTNG_DOMAIN_KERNEL
:
937 struct ltt_kernel_channel
*kchan
;
939 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
940 session
->kernel_session
);
943 * Don't try to create a channel if the session
944 * has been started at some point in time
945 * before. The tracer does not allow it.
947 if (session
->started
) {
948 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
951 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
952 if (attr
->name
[0] != '\0') {
953 session
->kernel_session
->has_non_default_channel
= 1;
956 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
959 if (ret
!= LTTNG_OK
) {
963 kernel_wait_quiescent(kernel_tracer_fd
);
966 case LTTNG_DOMAIN_UST
:
968 struct ltt_ust_channel
*uchan
;
970 chan_ht
= usess
->domain_global
.channels
;
972 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
975 * Don't try to create a channel if the session
976 * has been started at some point in time
977 * before. The tracer does not allow it.
979 if (session
->started
) {
980 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
983 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
984 if (attr
->name
[0] != '\0') {
985 usess
->has_non_default_channel
= 1;
988 ret
= channel_ust_enable(usess
, uchan
);
993 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1004 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1006 int cmd_disable_event(struct ltt_session
*session
, int domain
,
1007 char *channel_name
, char *event_name
)
1014 case LTTNG_DOMAIN_KERNEL
:
1016 struct ltt_kernel_channel
*kchan
;
1017 struct ltt_kernel_session
*ksess
;
1019 ksess
= session
->kernel_session
;
1022 * If a non-default channel has been created in the
1023 * session, explicitely require that -c chan_name needs
1026 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1027 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1031 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1032 if (kchan
== NULL
) {
1033 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1037 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
1038 if (ret
!= LTTNG_OK
) {
1042 kernel_wait_quiescent(kernel_tracer_fd
);
1045 case LTTNG_DOMAIN_UST
:
1047 struct ltt_ust_channel
*uchan
;
1048 struct ltt_ust_session
*usess
;
1050 usess
= session
->ust_session
;
1053 * If a non-default channel has been created in the
1054 * session, explicitely require that -c chan_name needs
1057 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1058 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1062 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1064 if (uchan
== NULL
) {
1065 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1069 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
1070 if (ret
!= LTTNG_OK
) {
1074 DBG3("Disable UST event %s in channel %s completed", event_name
,
1078 case LTTNG_DOMAIN_JUL
:
1080 struct ltt_ust_session
*usess
= session
->ust_session
;
1084 ret
= event_jul_disable(usess
, event_name
);
1085 if (ret
!= LTTNG_OK
) {
1092 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1093 case LTTNG_DOMAIN_UST_PID
:
1094 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1097 ret
= LTTNG_ERR_UND
;
1109 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1111 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
1119 case LTTNG_DOMAIN_KERNEL
:
1121 struct ltt_kernel_session
*ksess
;
1122 struct ltt_kernel_channel
*kchan
;
1124 ksess
= session
->kernel_session
;
1127 * If a non-default channel has been created in the
1128 * session, explicitely require that -c chan_name needs
1131 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1132 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1136 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1137 if (kchan
== NULL
) {
1138 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1142 ret
= event_kernel_disable_all(kchan
);
1143 if (ret
!= LTTNG_OK
) {
1147 kernel_wait_quiescent(kernel_tracer_fd
);
1150 case LTTNG_DOMAIN_UST
:
1152 struct ltt_ust_session
*usess
;
1153 struct ltt_ust_channel
*uchan
;
1155 usess
= session
->ust_session
;
1158 * If a non-default channel has been created in the
1159 * session, explicitely require that -c chan_name needs
1162 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1163 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1167 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1169 if (uchan
== NULL
) {
1170 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1174 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1179 DBG3("Disable all UST events in channel %s completed", channel_name
);
1183 case LTTNG_DOMAIN_JUL
:
1185 struct ltt_ust_session
*usess
= session
->ust_session
;
1189 ret
= event_jul_disable_all(usess
);
1190 if (ret
!= LTTNG_OK
) {
1197 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1198 case LTTNG_DOMAIN_UST_PID
:
1199 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1202 ret
= LTTNG_ERR_UND
;
1214 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1216 int cmd_add_context(struct ltt_session
*session
, int domain
,
1217 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1219 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1222 case LTTNG_DOMAIN_KERNEL
:
1223 assert(session
->kernel_session
);
1225 if (session
->kernel_session
->channel_count
== 0) {
1226 /* Create default channel */
1227 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1228 if (ret
!= LTTNG_OK
) {
1231 chan_kern_created
= 1;
1233 /* Add kernel context to kernel tracer */
1234 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1235 if (ret
!= LTTNG_OK
) {
1239 case LTTNG_DOMAIN_UST
:
1241 struct ltt_ust_session
*usess
= session
->ust_session
;
1242 unsigned int chan_count
;
1246 chan_count
= lttng_ht_get_count(usess
->domain_global
.channels
);
1247 if (chan_count
== 0) {
1248 struct lttng_channel
*attr
;
1249 /* Create default channel */
1250 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1252 ret
= LTTNG_ERR_FATAL
;
1256 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1257 if (ret
!= LTTNG_OK
) {
1262 chan_ust_created
= 1;
1265 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1266 if (ret
!= LTTNG_OK
) {
1272 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1273 case LTTNG_DOMAIN_UST_PID
:
1274 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1277 ret
= LTTNG_ERR_UND
;
1284 if (chan_kern_created
) {
1285 struct ltt_kernel_channel
*kchan
=
1286 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1287 session
->kernel_session
);
1288 /* Created previously, this should NOT fail. */
1290 kernel_destroy_channel(kchan
);
1293 if (chan_ust_created
) {
1294 struct ltt_ust_channel
*uchan
=
1295 trace_ust_find_channel_by_name(
1296 session
->ust_session
->domain_global
.channels
,
1297 DEFAULT_CHANNEL_NAME
);
1298 /* Created previously, this should NOT fail. */
1300 /* Remove from the channel list of the session. */
1301 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1303 trace_ust_destroy_channel(uchan
);
1309 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1311 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1312 char *channel_name
, struct lttng_event
*event
,
1313 struct lttng_filter_bytecode
*filter
,
1314 struct lttng_event_exclusion
*exclusion
,
1317 int ret
, channel_created
= 0;
1318 struct lttng_channel
*attr
;
1322 assert(channel_name
);
1326 switch (domain
->type
) {
1327 case LTTNG_DOMAIN_KERNEL
:
1329 struct ltt_kernel_channel
*kchan
;
1332 * If a non-default channel has been created in the
1333 * session, explicitely require that -c chan_name needs
1336 if (session
->kernel_session
->has_non_default_channel
1337 && channel_name
[0] == '\0') {
1338 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1342 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1343 session
->kernel_session
);
1344 if (kchan
== NULL
) {
1345 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1346 LTTNG_BUFFER_GLOBAL
);
1348 ret
= LTTNG_ERR_FATAL
;
1351 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1353 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1354 if (ret
!= LTTNG_OK
) {
1360 channel_created
= 1;
1363 /* Get the newly created kernel channel pointer */
1364 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1365 session
->kernel_session
);
1366 if (kchan
== NULL
) {
1367 /* This sould not happen... */
1368 ret
= LTTNG_ERR_FATAL
;
1372 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1373 if (ret
!= LTTNG_OK
) {
1374 if (channel_created
) {
1375 /* Let's not leak a useless channel. */
1376 kernel_destroy_channel(kchan
);
1381 kernel_wait_quiescent(kernel_tracer_fd
);
1384 case LTTNG_DOMAIN_UST
:
1386 struct ltt_ust_channel
*uchan
;
1387 struct ltt_ust_session
*usess
= session
->ust_session
;
1392 * If a non-default channel has been created in the
1393 * session, explicitely require that -c chan_name needs
1396 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1397 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1401 /* Get channel from global UST domain */
1402 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1404 if (uchan
== NULL
) {
1405 /* Create default channel */
1406 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1407 usess
->buffer_type
);
1409 ret
= LTTNG_ERR_FATAL
;
1412 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1414 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1415 if (ret
!= LTTNG_OK
) {
1421 /* Get the newly created channel reference back */
1422 uchan
= trace_ust_find_channel_by_name(
1423 usess
->domain_global
.channels
, channel_name
);
1427 /* At this point, the session and channel exist on the tracer */
1428 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
, filter
, exclusion
);
1429 if (ret
!= LTTNG_OK
) {
1434 case LTTNG_DOMAIN_JUL
:
1436 struct lttng_event uevent
;
1437 struct lttng_domain tmp_dom
;
1438 struct ltt_ust_session
*usess
= session
->ust_session
;
1442 /* Create the default JUL tracepoint. */
1443 memset(&uevent
, 0, sizeof(uevent
));
1444 uevent
.type
= LTTNG_EVENT_TRACEPOINT
;
1445 uevent
.loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
1447 strncpy(uevent
.name
, DEFAULT_SYS_JUL_EVENT_NAME
,
1448 sizeof(uevent
.name
));
1450 strncpy(uevent
.name
, DEFAULT_USER_JUL_EVENT_NAME
,
1451 sizeof(uevent
.name
));
1453 uevent
.name
[sizeof(uevent
.name
) - 1] = '\0';
1456 * The domain type is changed because we are about to enable the
1457 * default channel and event for the JUL domain that are hardcoded.
1458 * This happens in the UST domain.
1460 memcpy(&tmp_dom
, domain
, sizeof(tmp_dom
));
1461 tmp_dom
.type
= LTTNG_DOMAIN_UST
;
1463 ret
= cmd_enable_event(session
, &tmp_dom
, DEFAULT_JUL_CHANNEL_NAME
,
1464 &uevent
, NULL
, NULL
, wpipe
);
1465 if (ret
!= LTTNG_OK
&& ret
!= LTTNG_ERR_UST_EVENT_ENABLED
) {
1469 /* The wild card * means that everything should be enabled. */
1470 if (strncmp(event
->name
, "*", 1) == 0 && strlen(event
->name
) == 1) {
1471 ret
= event_jul_enable_all(usess
, event
);
1473 ret
= event_jul_enable(usess
, event
);
1475 if (ret
!= LTTNG_OK
) {
1482 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1483 case LTTNG_DOMAIN_UST_PID
:
1484 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1487 ret
= LTTNG_ERR_UND
;
1499 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1501 int cmd_enable_event_all(struct ltt_session
*session
,
1502 struct lttng_domain
*domain
, char *channel_name
, int event_type
,
1503 struct lttng_filter_bytecode
*filter
, int wpipe
)
1506 struct lttng_channel
*attr
;
1509 assert(channel_name
);
1513 switch (domain
->type
) {
1514 case LTTNG_DOMAIN_KERNEL
:
1516 struct ltt_kernel_channel
*kchan
;
1518 assert(session
->kernel_session
);
1521 * If a non-default channel has been created in the
1522 * session, explicitely require that -c chan_name needs
1525 if (session
->kernel_session
->has_non_default_channel
1526 && channel_name
[0] == '\0') {
1527 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1531 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1532 session
->kernel_session
);
1533 if (kchan
== NULL
) {
1534 /* Create default channel */
1535 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1536 LTTNG_BUFFER_GLOBAL
);
1538 ret
= LTTNG_ERR_FATAL
;
1541 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1543 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1544 if (ret
!= LTTNG_OK
) {
1550 /* Get the newly created kernel channel pointer */
1551 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1552 session
->kernel_session
);
1556 switch (event_type
) {
1557 case LTTNG_EVENT_SYSCALL
:
1558 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1560 case LTTNG_EVENT_TRACEPOINT
:
1562 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1563 * events already registered to the channel.
1565 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1567 case LTTNG_EVENT_ALL
:
1568 /* Enable syscalls and tracepoints */
1569 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1572 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1576 /* Manage return value */
1577 if (ret
!= LTTNG_OK
) {
1579 * On error, cmd_enable_channel call will take care of destroying
1580 * the created channel if it was needed.
1585 kernel_wait_quiescent(kernel_tracer_fd
);
1588 case LTTNG_DOMAIN_UST
:
1590 struct ltt_ust_channel
*uchan
;
1591 struct ltt_ust_session
*usess
= session
->ust_session
;
1596 * If a non-default channel has been created in the
1597 * session, explicitely require that -c chan_name needs
1600 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1601 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1605 /* Get channel from global UST domain */
1606 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1608 if (uchan
== NULL
) {
1609 /* Create default channel */
1610 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1611 usess
->buffer_type
);
1613 ret
= LTTNG_ERR_FATAL
;
1616 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1618 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1619 if (ret
!= LTTNG_OK
) {
1625 /* Get the newly created channel reference back */
1626 uchan
= trace_ust_find_channel_by_name(
1627 usess
->domain_global
.channels
, channel_name
);
1631 /* At this point, the session and channel exist on the tracer */
1633 switch (event_type
) {
1634 case LTTNG_EVENT_ALL
:
1635 case LTTNG_EVENT_TRACEPOINT
:
1636 ret
= event_ust_enable_all_tracepoints(usess
, uchan
, filter
);
1637 if (ret
!= LTTNG_OK
) {
1642 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1646 /* Manage return value */
1647 if (ret
!= LTTNG_OK
) {
1653 case LTTNG_DOMAIN_JUL
:
1655 struct lttng_event uevent
, event
;
1656 struct lttng_domain tmp_dom
;
1657 struct ltt_ust_session
*usess
= session
->ust_session
;
1661 /* Create the default JUL tracepoint. */
1662 uevent
.type
= LTTNG_EVENT_TRACEPOINT
;
1663 uevent
.loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
1665 strncpy(uevent
.name
, DEFAULT_SYS_JUL_EVENT_NAME
,
1666 sizeof(uevent
.name
));
1668 strncpy(uevent
.name
, DEFAULT_USER_JUL_EVENT_NAME
,
1669 sizeof(uevent
.name
));
1671 uevent
.name
[sizeof(uevent
.name
) - 1] = '\0';
1674 * The domain type is changed because we are about to enable the
1675 * default channel and event for the JUL domain that are hardcoded.
1676 * This happens in the UST domain.
1678 memcpy(&tmp_dom
, domain
, sizeof(tmp_dom
));
1679 tmp_dom
.type
= LTTNG_DOMAIN_UST
;
1681 ret
= cmd_enable_event(session
, &tmp_dom
, DEFAULT_JUL_CHANNEL_NAME
,
1682 &uevent
, NULL
, NULL
, wpipe
);
1683 if (ret
!= LTTNG_OK
&& ret
!= LTTNG_ERR_UST_EVENT_ENABLED
) {
1687 event
.loglevel
= LTTNG_LOGLEVEL_JUL_ALL
;
1688 event
.loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
1689 strncpy(event
.name
, "*", sizeof(event
.name
));
1690 event
.name
[sizeof(event
.name
) - 1] = '\0';
1692 ret
= event_jul_enable_all(usess
, &event
);
1693 if (ret
!= LTTNG_OK
) {
1700 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1701 case LTTNG_DOMAIN_UST_PID
:
1702 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1705 ret
= LTTNG_ERR_UND
;
1718 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1720 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1723 ssize_t nb_events
= 0;
1726 case LTTNG_DOMAIN_KERNEL
:
1727 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1728 if (nb_events
< 0) {
1729 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1733 case LTTNG_DOMAIN_UST
:
1734 nb_events
= ust_app_list_events(events
);
1735 if (nb_events
< 0) {
1736 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1740 case LTTNG_DOMAIN_JUL
:
1741 nb_events
= jul_list_events(events
);
1742 if (nb_events
< 0) {
1743 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1748 ret
= LTTNG_ERR_UND
;
1755 /* Return negative value to differentiate return code */
1760 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1762 ssize_t
cmd_list_tracepoint_fields(int domain
,
1763 struct lttng_event_field
**fields
)
1766 ssize_t nb_fields
= 0;
1769 case LTTNG_DOMAIN_UST
:
1770 nb_fields
= ust_app_list_event_fields(fields
);
1771 if (nb_fields
< 0) {
1772 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1776 case LTTNG_DOMAIN_KERNEL
:
1777 default: /* fall-through */
1778 ret
= LTTNG_ERR_UND
;
1785 /* Return negative value to differentiate return code */
1790 * Command LTTNG_START_TRACE processed by the client thread.
1792 int cmd_start_trace(struct ltt_session
*session
)
1795 unsigned long nb_chan
= 0;
1796 struct ltt_kernel_session
*ksession
;
1797 struct ltt_ust_session
*usess
;
1801 /* Ease our life a bit ;) */
1802 ksession
= session
->kernel_session
;
1803 usess
= session
->ust_session
;
1805 if (session
->enabled
) {
1806 /* Already started. */
1807 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1812 * Starting a session without channel is useless since after that it's not
1813 * possible to enable channel thus inform the client.
1815 if (usess
&& usess
->domain_global
.channels
) {
1816 nb_chan
+= lttng_ht_get_count(usess
->domain_global
.channels
);
1819 nb_chan
+= ksession
->channel_count
;
1822 ret
= LTTNG_ERR_NO_CHANNEL
;
1826 session
->enabled
= 1;
1828 /* Kernel tracing */
1829 if (ksession
!= NULL
) {
1830 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1831 if (ret
!= LTTNG_OK
) {
1836 /* Flag session that trace should start automatically */
1838 usess
->start_trace
= 1;
1840 ret
= ust_app_start_trace_all(usess
);
1842 ret
= LTTNG_ERR_UST_START_FAIL
;
1847 session
->started
= 1;
1856 * Command LTTNG_STOP_TRACE processed by the client thread.
1858 int cmd_stop_trace(struct ltt_session
*session
)
1861 struct ltt_kernel_channel
*kchan
;
1862 struct ltt_kernel_session
*ksession
;
1863 struct ltt_ust_session
*usess
;
1868 ksession
= session
->kernel_session
;
1869 usess
= session
->ust_session
;
1871 if (!session
->enabled
) {
1872 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1876 session
->enabled
= 0;
1879 if (ksession
&& ksession
->started
) {
1880 DBG("Stop kernel tracing");
1882 /* Flush metadata if exist */
1883 if (ksession
->metadata_stream_fd
>= 0) {
1884 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1886 ERR("Kernel metadata flush failed");
1890 /* Flush all buffers before stopping */
1891 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1892 ret
= kernel_flush_buffer(kchan
);
1894 ERR("Kernel flush buffer error");
1898 ret
= kernel_stop_session(ksession
);
1900 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1904 kernel_wait_quiescent(kernel_tracer_fd
);
1906 ksession
->started
= 0;
1909 if (usess
&& usess
->start_trace
) {
1910 usess
->start_trace
= 0;
1912 ret
= ust_app_stop_trace_all(usess
);
1914 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1926 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1928 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1929 size_t nb_uri
, struct lttng_uri
*uris
)
1932 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1933 struct ltt_ust_session
*usess
= session
->ust_session
;
1934 struct consumer_output
*consumer
= NULL
;
1940 /* Can't enable consumer after session started. */
1941 if (session
->enabled
) {
1942 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1947 * This case switch makes sure the domain session has a temporary consumer
1948 * so the URL can be set.
1952 /* Code flow error. A session MUST always have a consumer object */
1953 assert(session
->consumer
);
1955 * The URL will be added to the tracing session consumer instead of a
1956 * specific domain consumer.
1958 consumer
= session
->consumer
;
1960 case LTTNG_DOMAIN_KERNEL
:
1961 /* Code flow error if we don't have a kernel session here. */
1963 assert(ksess
->consumer
);
1964 consumer
= ksess
->consumer
;
1966 case LTTNG_DOMAIN_UST
:
1967 /* Code flow error if we don't have a kernel session here. */
1969 assert(usess
->consumer
);
1970 consumer
= usess
->consumer
;
1974 for (i
= 0; i
< nb_uri
; i
++) {
1975 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1976 if (ret
!= LTTNG_OK
) {
1989 * Command LTTNG_CREATE_SESSION processed by the client thread.
1991 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1992 size_t nb_uri
, lttng_sock_cred
*creds
, unsigned int live_timer
)
1995 struct ltt_session
*session
;
2001 * Verify if the session already exist
2003 * XXX: There is no need for the session lock list here since the caller
2004 * (process_client_msg) is holding it. We might want to change that so a
2005 * single command does not lock the entire session list.
2007 session
= session_find_by_name(name
);
2008 if (session
!= NULL
) {
2009 ret
= LTTNG_ERR_EXIST_SESS
;
2013 /* Create tracing session in the registry */
2014 ret
= session_create(name
, LTTNG_SOCK_GET_UID_CRED(creds
),
2015 LTTNG_SOCK_GET_GID_CRED(creds
));
2016 if (ret
!= LTTNG_OK
) {
2021 * Get the newly created session pointer back
2023 * XXX: There is no need for the session lock list here since the caller
2024 * (process_client_msg) is holding it. We might want to change that so a
2025 * single command does not lock the entire session list.
2027 session
= session_find_by_name(name
);
2030 session
->live_timer
= live_timer
;
2031 /* Create default consumer output for the session not yet created. */
2032 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
2033 if (session
->consumer
== NULL
) {
2034 ret
= LTTNG_ERR_FATAL
;
2035 goto consumer_error
;
2039 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
2040 if (ret
!= LTTNG_OK
) {
2041 goto consumer_error
;
2043 session
->output_traces
= 1;
2045 session
->output_traces
= 0;
2046 DBG2("Session %s created with no output", session
->name
);
2049 session
->consumer
->enabled
= 1;
2054 session_destroy(session
);
2061 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2063 int cmd_create_session_snapshot(char *name
, struct lttng_uri
*uris
,
2064 size_t nb_uri
, lttng_sock_cred
*creds
)
2067 struct ltt_session
*session
;
2068 struct snapshot_output
*new_output
= NULL
;
2074 * Create session in no output mode with URIs set to NULL. The uris we've
2075 * received are for a default snapshot output if one.
2077 ret
= cmd_create_session_uri(name
, NULL
, 0, creds
, -1);
2078 if (ret
!= LTTNG_OK
) {
2082 /* Get the newly created session pointer back. This should NEVER fail. */
2083 session
= session_find_by_name(name
);
2086 /* Flag session for snapshot mode. */
2087 session
->snapshot_mode
= 1;
2089 /* Skip snapshot output creation if no URI is given. */
2094 new_output
= snapshot_output_alloc();
2096 ret
= LTTNG_ERR_NOMEM
;
2097 goto error_snapshot_alloc
;
2100 ret
= snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE
, NULL
,
2101 uris
, nb_uri
, session
->consumer
, new_output
, &session
->snapshot
);
2103 if (ret
== -ENOMEM
) {
2104 ret
= LTTNG_ERR_NOMEM
;
2106 ret
= LTTNG_ERR_INVALID
;
2108 goto error_snapshot
;
2112 snapshot_add_output(&session
->snapshot
, new_output
);
2119 snapshot_output_destroy(new_output
);
2120 error_snapshot_alloc
:
2121 session_destroy(session
);
2127 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2129 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
2132 struct ltt_ust_session
*usess
;
2133 struct ltt_kernel_session
*ksess
;
2138 usess
= session
->ust_session
;
2139 ksess
= session
->kernel_session
;
2141 /* Clean kernel session teardown */
2142 kernel_destroy_session(ksess
);
2144 /* UST session teardown */
2146 /* Close any relayd session */
2147 consumer_output_send_destroy_relayd(usess
->consumer
);
2149 /* Destroy every UST application related to this session. */
2150 ret
= ust_app_destroy_trace_all(usess
);
2152 ERR("Error in ust_app_destroy_trace_all");
2155 /* Clean up the rest. */
2156 trace_ust_destroy_session(usess
);
2160 * Must notify the kernel thread here to update it's poll set in order to
2161 * remove the channel(s)' fd just destroyed.
2163 ret
= notify_thread_pipe(wpipe
);
2165 PERROR("write kernel poll pipe");
2168 ret
= session_destroy(session
);
2174 * Command LTTNG_CALIBRATE processed by the client thread.
2176 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
2181 case LTTNG_DOMAIN_KERNEL
:
2183 struct lttng_kernel_calibrate kcalibrate
;
2185 switch (calibrate
->type
) {
2186 case LTTNG_CALIBRATE_FUNCTION
:
2188 /* Default and only possible calibrate option. */
2189 kcalibrate
.type
= LTTNG_KERNEL_CALIBRATE_KRETPROBE
;
2193 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2195 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
2200 case LTTNG_DOMAIN_UST
:
2202 struct lttng_ust_calibrate ucalibrate
;
2204 switch (calibrate
->type
) {
2205 case LTTNG_CALIBRATE_FUNCTION
:
2207 /* Default and only possible calibrate option. */
2208 ucalibrate
.type
= LTTNG_UST_CALIBRATE_TRACEPOINT
;
2212 ret
= ust_app_calibrate_glb(&ucalibrate
);
2214 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
2220 ret
= LTTNG_ERR_UND
;
2231 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2233 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2234 const char *sock_path
, struct consumer_data
*cdata
)
2237 struct consumer_socket
*socket
= NULL
;
2244 case LTTNG_DOMAIN_KERNEL
:
2246 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2250 /* Can't register a consumer if there is already one */
2251 if (ksess
->consumer_fds_sent
!= 0) {
2252 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2256 sock
= lttcomm_connect_unix_sock(sock_path
);
2258 ret
= LTTNG_ERR_CONNECT_FAIL
;
2261 cdata
->cmd_sock
= sock
;
2263 socket
= consumer_allocate_socket(&cdata
->cmd_sock
);
2264 if (socket
== NULL
) {
2267 PERROR("close register consumer");
2269 cdata
->cmd_sock
= -1;
2270 ret
= LTTNG_ERR_FATAL
;
2274 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
2275 if (socket
->lock
== NULL
) {
2276 PERROR("zmalloc pthread mutex");
2277 ret
= LTTNG_ERR_FATAL
;
2280 pthread_mutex_init(socket
->lock
, NULL
);
2281 socket
->registered
= 1;
2284 consumer_add_socket(socket
, ksess
->consumer
);
2287 pthread_mutex_lock(&cdata
->pid_mutex
);
2289 pthread_mutex_unlock(&cdata
->pid_mutex
);
2294 /* TODO: Userspace tracing */
2295 ret
= LTTNG_ERR_UND
;
2303 consumer_destroy_socket(socket
);
2309 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2311 ssize_t
cmd_list_domains(struct ltt_session
*session
,
2312 struct lttng_domain
**domains
)
2317 if (session
->kernel_session
!= NULL
) {
2318 DBG3("Listing domains found kernel domain");
2322 if (session
->ust_session
!= NULL
) {
2323 DBG3("Listing domains found UST global domain");
2326 if (session
->ust_session
->domain_jul
.being_used
) {
2331 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2332 if (*domains
== NULL
) {
2333 ret
= LTTNG_ERR_FATAL
;
2337 if (session
->kernel_session
!= NULL
) {
2338 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2342 if (session
->ust_session
!= NULL
) {
2343 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2344 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2347 if (session
->ust_session
->domain_jul
.being_used
) {
2348 (*domains
)[index
].type
= LTTNG_DOMAIN_JUL
;
2349 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2357 /* Return negative value to differentiate return code */
2363 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2365 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
2366 struct lttng_channel
**channels
)
2369 ssize_t nb_chan
= 0;
2372 case LTTNG_DOMAIN_KERNEL
:
2373 if (session
->kernel_session
!= NULL
) {
2374 nb_chan
= session
->kernel_session
->channel_count
;
2376 DBG3("Number of kernel channels %zd", nb_chan
);
2378 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2381 case LTTNG_DOMAIN_UST
:
2382 if (session
->ust_session
!= NULL
) {
2383 nb_chan
= lttng_ht_get_count(
2384 session
->ust_session
->domain_global
.channels
);
2386 DBG3("Number of UST global channels %zd", nb_chan
);
2388 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2393 ret
= LTTNG_ERR_UND
;
2398 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2399 if (*channels
== NULL
) {
2400 ret
= LTTNG_ERR_FATAL
;
2404 list_lttng_channels(domain
, session
, *channels
);
2407 /* Ret value was set in the domain switch case */
2414 /* Return negative value to differentiate return code */
2419 * Command LTTNG_LIST_EVENTS processed by the client thread.
2421 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2422 char *channel_name
, struct lttng_event
**events
)
2425 ssize_t nb_event
= 0;
2428 case LTTNG_DOMAIN_KERNEL
:
2429 if (session
->kernel_session
!= NULL
) {
2430 nb_event
= list_lttng_kernel_events(channel_name
,
2431 session
->kernel_session
, events
);
2434 case LTTNG_DOMAIN_UST
:
2436 if (session
->ust_session
!= NULL
) {
2437 nb_event
= list_lttng_ust_global_events(channel_name
,
2438 &session
->ust_session
->domain_global
, events
);
2442 case LTTNG_DOMAIN_JUL
:
2443 if (session
->ust_session
) {
2444 nb_event
= list_lttng_jul_events(
2445 &session
->ust_session
->domain_jul
, events
);
2449 ret
= LTTNG_ERR_UND
;
2456 /* Return negative value to differentiate return code */
2461 * Using the session list, filled a lttng_session array to send back to the
2462 * client for session listing.
2464 * The session list lock MUST be acquired before calling this function. Use
2465 * session_lock_list() and session_unlock_list().
2467 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2472 struct ltt_session
*session
;
2473 struct ltt_session_list
*list
= session_get_list();
2475 DBG("Getting all available session for UID %d GID %d",
2478 * Iterate over session list and append data after the control struct in
2481 cds_list_for_each_entry(session
, &list
->head
, list
) {
2483 * Only list the sessions the user can control.
2485 if (!session_access_ok(session
, uid
, gid
)) {
2489 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2490 struct ltt_ust_session
*usess
= session
->ust_session
;
2492 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2493 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2494 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2495 ret
= build_network_session_path(sessions
[i
].path
,
2496 sizeof(sessions
[i
].path
), session
);
2498 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
2499 session
->consumer
->dst
.trace_path
);
2502 PERROR("snprintf session path");
2506 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2507 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2508 sessions
[i
].enabled
= session
->enabled
;
2509 sessions
[i
].snapshot_mode
= session
->snapshot_mode
;
2510 sessions
[i
].live_timer_interval
= session
->live_timer
;
2516 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2517 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2519 int cmd_data_pending(struct ltt_session
*session
)
2522 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2523 struct ltt_ust_session
*usess
= session
->ust_session
;
2527 /* Session MUST be stopped to ask for data availability. */
2528 if (session
->enabled
) {
2529 ret
= LTTNG_ERR_SESSION_STARTED
;
2533 if (ksess
&& ksess
->consumer
) {
2534 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2536 /* Data is still being extracted for the kernel. */
2541 if (usess
&& usess
->consumer
) {
2542 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2544 /* Data is still being extracted for the kernel. */
2549 /* Data is ready to be read by a viewer */
2557 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2559 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2561 int cmd_snapshot_add_output(struct ltt_session
*session
,
2562 struct lttng_snapshot_output
*output
, uint32_t *id
)
2565 struct snapshot_output
*new_output
;
2570 DBG("Cmd snapshot add output for session %s", session
->name
);
2573 * Permission denied to create an output if the session is not
2574 * set in no output mode.
2576 if (session
->output_traces
) {
2577 ret
= LTTNG_ERR_EPERM
;
2581 /* Only one output is allowed until we have the "tee" feature. */
2582 if (session
->snapshot
.nb_output
== 1) {
2583 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
2587 new_output
= snapshot_output_alloc();
2589 ret
= LTTNG_ERR_NOMEM
;
2593 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2594 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
2595 &session
->snapshot
);
2597 if (ret
== -ENOMEM
) {
2598 ret
= LTTNG_ERR_NOMEM
;
2600 ret
= LTTNG_ERR_INVALID
;
2606 snapshot_add_output(&session
->snapshot
, new_output
);
2608 *id
= new_output
->id
;
2615 snapshot_output_destroy(new_output
);
2621 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2623 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2625 int cmd_snapshot_del_output(struct ltt_session
*session
,
2626 struct lttng_snapshot_output
*output
)
2629 struct snapshot_output
*sout
= NULL
;
2637 * Permission denied to create an output if the session is not
2638 * set in no output mode.
2640 if (session
->output_traces
) {
2641 ret
= LTTNG_ERR_EPERM
;
2646 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
2648 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
2649 } else if (*output
->name
!= '\0') {
2650 DBG("Cmd snapshot del output name %s for session %s", output
->name
,
2652 sout
= snapshot_find_output_by_name(output
->name
, &session
->snapshot
);
2655 ret
= LTTNG_ERR_INVALID
;
2659 snapshot_delete_output(&session
->snapshot
, sout
);
2660 snapshot_output_destroy(sout
);
2669 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2671 * If no output is available, outputs is untouched and 0 is returned.
2673 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2675 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
2676 struct lttng_snapshot_output
**outputs
)
2679 struct lttng_snapshot_output
*list
;
2680 struct lttng_ht_iter iter
;
2681 struct snapshot_output
*output
;
2686 DBG("Cmd snapshot list outputs for session %s", session
->name
);
2689 * Permission denied to create an output if the session is not
2690 * set in no output mode.
2692 if (session
->output_traces
) {
2693 ret
= LTTNG_ERR_EPERM
;
2697 if (session
->snapshot
.nb_output
== 0) {
2702 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
2704 ret
= LTTNG_ERR_NOMEM
;
2708 /* Copy list from session to the new list object. */
2709 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
2710 output
, node
.node
) {
2711 assert(output
->consumer
);
2712 list
[idx
].id
= output
->id
;
2713 list
[idx
].max_size
= output
->max_size
;
2714 strncpy(list
[idx
].name
, output
->name
, sizeof(list
[idx
].name
));
2715 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
2716 strncpy(list
[idx
].ctrl_url
, output
->consumer
->dst
.trace_path
,
2717 sizeof(list
[idx
].ctrl_url
));
2720 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
2721 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
2723 ret
= LTTNG_ERR_NOMEM
;
2728 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
2729 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
2731 ret
= LTTNG_ERR_NOMEM
;
2739 return session
->snapshot
.nb_output
;
2748 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2749 * snapshot output is *not* set with a remote destination.
2751 * Return 0 on success or a LTTNG_ERR code.
2753 static int set_relayd_for_snapshot(struct consumer_output
*consumer
,
2754 struct snapshot_output
*snap_output
, struct ltt_session
*session
)
2757 struct lttng_ht_iter iter
;
2758 struct consumer_socket
*socket
;
2761 assert(snap_output
);
2764 DBG2("Set relayd object from snapshot output");
2766 /* Ignore if snapshot consumer output is not network. */
2767 if (snap_output
->consumer
->type
!= CONSUMER_DST_NET
) {
2772 * For each consumer socket, create and send the relayd object of the
2776 cds_lfht_for_each_entry(snap_output
->consumer
->socks
->ht
, &iter
.iter
,
2777 socket
, node
.node
) {
2778 ret
= send_consumer_relayd_sockets(0, session
->id
,
2779 snap_output
->consumer
, socket
,
2780 session
->name
, session
->hostname
,
2781 session
->live_timer
);
2782 if (ret
!= LTTNG_OK
) {
2794 * Record a kernel snapshot.
2796 * Return LTTNG_OK on success or a LTTNG_ERR code.
2798 static int record_kernel_snapshot(struct ltt_kernel_session
*ksess
,
2799 struct snapshot_output
*output
, struct ltt_session
*session
,
2800 int wait
, int nb_streams
)
2808 /* Get the datetime for the snapshot output directory. */
2809 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
2810 sizeof(output
->datetime
));
2812 ret
= LTTNG_ERR_INVALID
;
2817 * Copy kernel session sockets so we can communicate with the right
2818 * consumer for the snapshot record command.
2820 ret
= consumer_copy_sockets(output
->consumer
, ksess
->consumer
);
2822 ret
= LTTNG_ERR_NOMEM
;
2826 ret
= set_relayd_for_snapshot(ksess
->consumer
, output
, session
);
2827 if (ret
!= LTTNG_OK
) {
2828 goto error_snapshot
;
2831 ret
= kernel_snapshot_record(ksess
, output
, wait
, nb_streams
);
2832 if (ret
!= LTTNG_OK
) {
2833 goto error_snapshot
;
2839 /* Clean up copied sockets so this output can use some other later on. */
2840 consumer_destroy_output_sockets(output
->consumer
);
2846 * Record a UST snapshot.
2848 * Return 0 on success or a LTTNG_ERR error code.
2850 static int record_ust_snapshot(struct ltt_ust_session
*usess
,
2851 struct snapshot_output
*output
, struct ltt_session
*session
,
2852 int wait
, int nb_streams
)
2860 /* Get the datetime for the snapshot output directory. */
2861 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
2862 sizeof(output
->datetime
));
2864 ret
= LTTNG_ERR_INVALID
;
2869 * Copy UST session sockets so we can communicate with the right
2870 * consumer for the snapshot record command.
2872 ret
= consumer_copy_sockets(output
->consumer
, usess
->consumer
);
2874 ret
= LTTNG_ERR_NOMEM
;
2878 ret
= set_relayd_for_snapshot(usess
->consumer
, output
, session
);
2879 if (ret
!= LTTNG_OK
) {
2880 goto error_snapshot
;
2883 ret
= ust_app_snapshot_record(usess
, output
, wait
, nb_streams
);
2887 ret
= LTTNG_ERR_INVALID
;
2890 ret
= LTTNG_ERR_SNAPSHOT_NODATA
;
2893 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
2896 goto error_snapshot
;
2902 /* Clean up copied sockets so this output can use some other later on. */
2903 consumer_destroy_output_sockets(output
->consumer
);
2909 * Returns the total number of streams for a session or a negative value
2912 static unsigned int get_total_nb_stream(struct ltt_session
*session
)
2914 unsigned int total_streams
= 0;
2916 if (session
->kernel_session
) {
2917 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2919 total_streams
+= ksess
->stream_count_global
;
2922 if (session
->ust_session
) {
2923 struct ltt_ust_session
*usess
= session
->ust_session
;
2925 total_streams
+= ust_app_get_nb_stream(usess
);
2928 return total_streams
;
2932 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2934 * The wait parameter is ignored so this call always wait for the snapshot to
2935 * complete before returning.
2937 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2939 int cmd_snapshot_record(struct ltt_session
*session
,
2940 struct lttng_snapshot_output
*output
, int wait
)
2943 unsigned int use_tmp_output
= 0;
2944 struct snapshot_output tmp_output
;
2945 unsigned int nb_streams
, snapshot_success
= 0;
2949 DBG("Cmd snapshot record for session %s", session
->name
);
2952 * Permission denied to create an output if the session is not
2953 * set in no output mode.
2955 if (session
->output_traces
) {
2956 ret
= LTTNG_ERR_EPERM
;
2960 /* The session needs to be started at least once. */
2961 if (!session
->started
) {
2962 ret
= LTTNG_ERR_START_SESSION_ONCE
;
2966 /* Use temporary output for the session. */
2967 if (output
&& *output
->ctrl_url
!= '\0') {
2968 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2969 output
->ctrl_url
, output
->data_url
, session
->consumer
,
2972 if (ret
== -ENOMEM
) {
2973 ret
= LTTNG_ERR_NOMEM
;
2975 ret
= LTTNG_ERR_INVALID
;
2979 /* Use the global session count for the temporary snapshot. */
2980 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
2985 * Get the total number of stream of that session which is used by the
2986 * maximum size of the snapshot feature.
2988 nb_streams
= get_total_nb_stream(session
);
2990 if (session
->kernel_session
) {
2991 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2993 if (use_tmp_output
) {
2994 ret
= record_kernel_snapshot(ksess
, &tmp_output
, session
,
2996 if (ret
!= LTTNG_OK
) {
2999 snapshot_success
= 1;
3001 struct snapshot_output
*sout
;
3002 struct lttng_ht_iter iter
;
3005 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
3006 &iter
.iter
, sout
, node
.node
) {
3008 * Make a local copy of the output and assign the possible
3009 * temporary value given by the caller.
3011 memset(&tmp_output
, 0, sizeof(tmp_output
));
3012 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
3014 /* Use temporary max size. */
3015 if (output
->max_size
!= (uint64_t) -1ULL) {
3016 tmp_output
.max_size
= output
->max_size
;
3019 /* Use temporary name. */
3020 if (*output
->name
!= '\0') {
3021 strncpy(tmp_output
.name
, output
->name
,
3022 sizeof(tmp_output
.name
));
3025 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3027 ret
= record_kernel_snapshot(ksess
, &tmp_output
,
3028 session
, wait
, nb_streams
);
3029 if (ret
!= LTTNG_OK
) {
3033 snapshot_success
= 1;
3039 if (session
->ust_session
) {
3040 struct ltt_ust_session
*usess
= session
->ust_session
;
3042 if (use_tmp_output
) {
3043 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
3045 if (ret
!= LTTNG_OK
) {
3048 snapshot_success
= 1;
3050 struct snapshot_output
*sout
;
3051 struct lttng_ht_iter iter
;
3054 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
3055 &iter
.iter
, sout
, node
.node
) {
3057 * Make a local copy of the output and assign the possible
3058 * temporary value given by the caller.
3060 memset(&tmp_output
, 0, sizeof(tmp_output
));
3061 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
3063 /* Use temporary max size. */
3064 if (output
->max_size
!= (uint64_t) -1ULL) {
3065 tmp_output
.max_size
= output
->max_size
;
3068 /* Use temporary name. */
3069 if (*output
->name
!= '\0') {
3070 strncpy(tmp_output
.name
, output
->name
,
3071 sizeof(tmp_output
.name
));
3074 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3076 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
3078 if (ret
!= LTTNG_OK
) {
3082 snapshot_success
= 1;
3088 if (snapshot_success
) {
3089 session
->snapshot
.nb_snapshot
++;
3091 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
3099 * Init command subsystem.
3104 * Set network sequence index to 1 for streams to match a relayd
3105 * socket on the consumer side.
3107 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
3108 relayd_net_seq_idx
= 1;
3109 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
3111 DBG("Command subsystem initialized");