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"
43 * Used to keep a unique index for each relayd socket created where this value
44 * is associated with streams on the consumer so it can match the right relayd
45 * to send to. It must be accessed with the relayd_net_seq_idx_lock
48 static pthread_mutex_t relayd_net_seq_idx_lock
= PTHREAD_MUTEX_INITIALIZER
;
49 static uint64_t relayd_net_seq_idx
;
52 * Both functions below are special case for the Kernel domain when
53 * enabling/disabling all events.
56 int enable_kevent_all(struct ltt_session
*session
,
57 struct lttng_domain
*domain
, char *channel_name
,
58 struct lttng_event
*event
,
59 char *filter_expression
,
60 struct lttng_filter_bytecode
*filter
, int wpipe
);
62 int disable_kevent_all(struct ltt_session
*session
, int domain
,
64 struct lttng_event
*event
);
67 * Create a session path used by list_lttng_sessions for the case that the
68 * session consumer is on the network.
70 static int build_network_session_path(char *dst
, size_t size
,
71 struct ltt_session
*session
)
73 int ret
, kdata_port
, udata_port
;
74 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
75 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
80 memset(tmp_urls
, 0, sizeof(tmp_urls
));
81 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
83 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
85 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
86 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
87 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
90 if (session
->ust_session
&& session
->ust_session
->consumer
) {
91 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
92 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
95 if (uuri
== NULL
&& kuri
== NULL
) {
96 uri
= &session
->consumer
->dst
.net
.control
;
97 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
98 } else if (kuri
&& uuri
) {
99 ret
= uri_compare(kuri
, uuri
);
103 /* Build uuri URL string */
104 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
111 } else if (kuri
&& uuri
== NULL
) {
113 } else if (uuri
&& kuri
== NULL
) {
117 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
123 * Do we have a UST url set. If yes, this means we have both kernel and UST
126 if (*tmp_uurl
!= '\0') {
127 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
128 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
131 if (kuri
|| (!kuri
&& !uuri
)) {
134 /* No kernel URI, use the UST port. */
137 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, dport
);
145 * Fill lttng_channel array of all channels.
147 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
148 struct lttng_channel
*channels
)
151 struct ltt_kernel_channel
*kchan
;
153 DBG("Listing channels for session %s", session
->name
);
156 case LTTNG_DOMAIN_KERNEL
:
157 /* Kernel channels */
158 if (session
->kernel_session
!= NULL
) {
159 cds_list_for_each_entry(kchan
,
160 &session
->kernel_session
->channel_list
.head
, list
) {
161 /* Copy lttng_channel struct to array */
162 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
163 channels
[i
].enabled
= kchan
->enabled
;
168 case LTTNG_DOMAIN_UST
:
170 struct lttng_ht_iter iter
;
171 struct ltt_ust_channel
*uchan
;
174 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
175 &iter
.iter
, uchan
, node
.node
) {
176 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
177 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
178 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
179 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
180 channels
[i
].attr
.switch_timer_interval
=
181 uchan
->attr
.switch_timer_interval
;
182 channels
[i
].attr
.read_timer_interval
=
183 uchan
->attr
.read_timer_interval
;
184 channels
[i
].enabled
= uchan
->enabled
;
185 channels
[i
].attr
.tracefile_size
= uchan
->tracefile_size
;
186 channels
[i
].attr
.tracefile_count
= uchan
->tracefile_count
;
187 switch (uchan
->attr
.output
) {
190 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
204 * Create a list of agent domain events.
206 * Return number of events in list on success or else a negative value.
208 static int list_lttng_agent_events(struct agent
*agt
,
209 struct lttng_event
**events
)
212 unsigned int nb_event
= 0;
213 struct agent_event
*event
;
214 struct lttng_event
*tmp_events
;
215 struct lttng_ht_iter iter
;
220 DBG3("Listing agent events");
222 nb_event
= lttng_ht_get_count(agt
->events
);
228 tmp_events
= zmalloc(nb_event
* sizeof(*tmp_events
));
230 PERROR("zmalloc agent events session");
231 ret
= -LTTNG_ERR_FATAL
;
236 cds_lfht_for_each_entry(agt
->events
->ht
, &iter
.iter
, event
, node
.node
) {
237 strncpy(tmp_events
[i
].name
, event
->name
, sizeof(tmp_events
[i
].name
));
238 tmp_events
[i
].name
[sizeof(tmp_events
[i
].name
) - 1] = '\0';
239 tmp_events
[i
].enabled
= event
->enabled
;
240 tmp_events
[i
].loglevel
= event
->loglevel
;
241 tmp_events
[i
].loglevel_type
= event
->loglevel_type
;
246 *events
= tmp_events
;
250 assert(nb_event
== i
);
255 * Create a list of ust global domain events.
257 static int list_lttng_ust_global_events(char *channel_name
,
258 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
261 unsigned int nb_event
= 0;
262 struct lttng_ht_iter iter
;
263 struct lttng_ht_node_str
*node
;
264 struct ltt_ust_channel
*uchan
;
265 struct ltt_ust_event
*uevent
;
266 struct lttng_event
*tmp
;
268 DBG("Listing UST global events for channel %s", channel_name
);
272 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
273 node
= lttng_ht_iter_get_node_str(&iter
);
275 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
279 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
281 nb_event
+= lttng_ht_get_count(uchan
->events
);
288 DBG3("Listing UST global %d events", nb_event
);
290 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
292 ret
= LTTNG_ERR_FATAL
;
296 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
297 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
298 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
299 tmp
[i
].enabled
= uevent
->enabled
;
301 switch (uevent
->attr
.instrumentation
) {
302 case LTTNG_UST_TRACEPOINT
:
303 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
305 case LTTNG_UST_PROBE
:
306 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
308 case LTTNG_UST_FUNCTION
:
309 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
313 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
314 switch (uevent
->attr
.loglevel_type
) {
315 case LTTNG_UST_LOGLEVEL_ALL
:
316 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
318 case LTTNG_UST_LOGLEVEL_RANGE
:
319 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
321 case LTTNG_UST_LOGLEVEL_SINGLE
:
322 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
325 if (uevent
->filter
) {
328 if (uevent
->exclusion
) {
329 tmp
[i
].exclusion
= 1;
343 * Fill lttng_event array of all kernel events in the channel.
345 static int list_lttng_kernel_events(char *channel_name
,
346 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
349 unsigned int nb_event
;
350 struct ltt_kernel_event
*event
;
351 struct ltt_kernel_channel
*kchan
;
353 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
355 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
359 nb_event
= kchan
->event_count
;
361 DBG("Listing events for channel %s", kchan
->channel
->name
);
368 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
369 if (*events
== NULL
) {
370 ret
= LTTNG_ERR_FATAL
;
374 /* Kernel channels */
375 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
376 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
377 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
378 (*events
)[i
].enabled
= event
->enabled
;
380 switch (event
->event
->instrumentation
) {
381 case LTTNG_KERNEL_TRACEPOINT
:
382 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
384 case LTTNG_KERNEL_KRETPROBE
:
385 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
386 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
387 sizeof(struct lttng_kernel_kprobe
));
389 case LTTNG_KERNEL_KPROBE
:
390 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
391 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
392 sizeof(struct lttng_kernel_kprobe
));
394 case LTTNG_KERNEL_FUNCTION
:
395 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
396 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
397 sizeof(struct lttng_kernel_function
));
399 case LTTNG_KERNEL_NOOP
:
400 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
402 case LTTNG_KERNEL_SYSCALL
:
403 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
405 case LTTNG_KERNEL_ALL
:
416 new_size
= syscall_list_channel(kchan
, events
, nb_event
);
428 /* Negate the error code to differentiate the size from an error */
433 * Add URI so the consumer output object. Set the correct path depending on the
434 * domain adding the default trace directory.
436 static int add_uri_to_consumer(struct consumer_output
*consumer
,
437 struct lttng_uri
*uri
, int domain
, const char *session_name
)
440 const char *default_trace_dir
;
444 if (consumer
== NULL
) {
445 DBG("No consumer detected. Don't add URI. Stopping.");
446 ret
= LTTNG_ERR_NO_CONSUMER
;
451 case LTTNG_DOMAIN_KERNEL
:
452 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
454 case LTTNG_DOMAIN_UST
:
455 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
459 * This case is possible is we try to add the URI to the global tracing
460 * session consumer object which in this case there is no subdir.
462 default_trace_dir
= "";
465 switch (uri
->dtype
) {
468 DBG2("Setting network URI to consumer");
470 if (consumer
->type
== CONSUMER_DST_NET
) {
471 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
472 consumer
->dst
.net
.control_isset
) ||
473 (uri
->stype
== LTTNG_STREAM_DATA
&&
474 consumer
->dst
.net
.data_isset
)) {
475 ret
= LTTNG_ERR_URL_EXIST
;
479 memset(&consumer
->dst
.net
, 0, sizeof(consumer
->dst
.net
));
482 consumer
->type
= CONSUMER_DST_NET
;
484 /* Set URI into consumer output object */
485 ret
= consumer_set_network_uri(consumer
, uri
);
489 } else if (ret
== 1) {
491 * URI was the same in the consumer so we do not append the subdir
492 * again so to not duplicate output dir.
498 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
499 ret
= consumer_set_subdir(consumer
, session_name
);
501 ret
= LTTNG_ERR_FATAL
;
506 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
507 /* On a new subdir, reappend the default trace dir. */
508 strncat(consumer
->subdir
, default_trace_dir
,
509 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
510 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
515 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
516 memset(consumer
->dst
.trace_path
, 0,
517 sizeof(consumer
->dst
.trace_path
));
518 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
519 sizeof(consumer
->dst
.trace_path
));
520 /* Append default trace dir */
521 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
522 sizeof(consumer
->dst
.trace_path
) -
523 strlen(consumer
->dst
.trace_path
) - 1);
524 /* Flag consumer as local. */
525 consumer
->type
= CONSUMER_DST_LOCAL
;
536 * Init tracing by creating trace directory and sending fds kernel consumer.
538 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
541 struct lttng_ht_iter iter
;
542 struct consumer_socket
*socket
;
548 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
549 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
551 pthread_mutex_lock(socket
->lock
);
552 ret
= kernel_consumer_send_session(socket
, session
);
553 pthread_mutex_unlock(socket
->lock
);
555 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
567 * Create a socket to the relayd using the URI.
569 * On success, the relayd_sock pointer is set to the created socket.
570 * Else, it's stays untouched and a lttcomm error code is returned.
572 static int create_connect_relayd(struct lttng_uri
*uri
,
573 struct lttcomm_relayd_sock
**relayd_sock
)
576 struct lttcomm_relayd_sock
*rsock
;
578 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
579 RELAYD_VERSION_COMM_MINOR
);
581 ret
= LTTNG_ERR_FATAL
;
586 * Connect to relayd so we can proceed with a session creation. This call
587 * can possibly block for an arbitrary amount of time to set the health
588 * state to be in poll execution.
591 ret
= relayd_connect(rsock
);
594 ERR("Unable to reach lttng-relayd");
595 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
599 /* Create socket for control stream. */
600 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
601 DBG3("Creating relayd stream socket from URI");
603 /* Check relayd version */
604 ret
= relayd_version_check(rsock
);
606 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
609 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
610 DBG3("Creating relayd data socket from URI");
612 /* Command is not valid */
613 ERR("Relayd invalid stream type: %d", uri
->stype
);
614 ret
= LTTNG_ERR_INVALID
;
618 *relayd_sock
= rsock
;
623 /* The returned value is not useful since we are on an error path. */
624 (void) relayd_close(rsock
);
632 * Connect to the relayd using URI and send the socket to the right consumer.
634 static int send_consumer_relayd_socket(int domain
, unsigned int session_id
,
635 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
636 struct consumer_socket
*consumer_sock
,
637 char *session_name
, char *hostname
, int session_live_timer
)
640 struct lttcomm_relayd_sock
*rsock
= NULL
;
642 /* Connect to relayd and make version check if uri is the control. */
643 ret
= create_connect_relayd(relayd_uri
, &rsock
);
644 if (ret
!= LTTNG_OK
) {
649 /* Set the network sequence index if not set. */
650 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
651 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
653 * Increment net_seq_idx because we are about to transfer the
654 * new relayd socket to the consumer.
655 * Assign unique key so the consumer can match streams.
657 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
658 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
661 /* Send relayd socket to consumer. */
662 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
663 relayd_uri
->stype
, session_id
,
664 session_name
, hostname
, session_live_timer
);
666 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
670 /* Flag that the corresponding socket was sent. */
671 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
672 consumer_sock
->control_sock_sent
= 1;
673 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
674 consumer_sock
->data_sock_sent
= 1;
680 * Close socket which was dup on the consumer side. The session daemon does
681 * NOT keep track of the relayd socket(s) once transfer to the consumer.
685 (void) relayd_close(rsock
);
689 if (ret
!= LTTNG_OK
) {
691 * The consumer output for this session should not be used anymore
692 * since the relayd connection failed thus making any tracing or/and
693 * streaming not usable.
695 consumer
->enabled
= 0;
701 * Send both relayd sockets to a specific consumer and domain. This is a
702 * helper function to facilitate sending the information to the consumer for a
705 static int send_consumer_relayd_sockets(int domain
, unsigned int session_id
,
706 struct consumer_output
*consumer
, struct consumer_socket
*sock
,
707 char *session_name
, char *hostname
, int session_live_timer
)
714 /* Sending control relayd socket. */
715 if (!sock
->control_sock_sent
) {
716 ret
= send_consumer_relayd_socket(domain
, session_id
,
717 &consumer
->dst
.net
.control
, consumer
, sock
,
718 session_name
, hostname
, session_live_timer
);
719 if (ret
!= LTTNG_OK
) {
724 /* Sending data relayd socket. */
725 if (!sock
->data_sock_sent
) {
726 ret
= send_consumer_relayd_socket(domain
, session_id
,
727 &consumer
->dst
.net
.data
, consumer
, sock
,
728 session_name
, hostname
, session_live_timer
);
729 if (ret
!= LTTNG_OK
) {
739 * Setup relayd connections for a tracing session. First creates the socket to
740 * the relayd and send them to the right domain consumer. Consumer type MUST be
743 int cmd_setup_relayd(struct ltt_session
*session
)
746 struct ltt_ust_session
*usess
;
747 struct ltt_kernel_session
*ksess
;
748 struct consumer_socket
*socket
;
749 struct lttng_ht_iter iter
;
753 usess
= session
->ust_session
;
754 ksess
= session
->kernel_session
;
756 DBG("Setting relayd for session %s", session
->name
);
760 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
761 && usess
->consumer
->enabled
) {
762 /* For each consumer socket, send relayd sockets */
763 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
765 pthread_mutex_lock(socket
->lock
);
766 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
->id
,
767 usess
->consumer
, socket
,
768 session
->name
, session
->hostname
,
769 session
->live_timer
);
770 pthread_mutex_unlock(socket
->lock
);
771 if (ret
!= LTTNG_OK
) {
774 /* Session is now ready for network streaming. */
775 session
->net_handle
= 1;
779 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
780 && ksess
->consumer
->enabled
) {
781 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
783 pthread_mutex_lock(socket
->lock
);
784 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
->id
,
785 ksess
->consumer
, socket
,
786 session
->name
, session
->hostname
,
787 session
->live_timer
);
788 pthread_mutex_unlock(socket
->lock
);
789 if (ret
!= LTTNG_OK
) {
792 /* Session is now ready for network streaming. */
793 session
->net_handle
= 1;
803 * Start a kernel session by opening all necessary streams.
805 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
808 struct ltt_kernel_channel
*kchan
;
810 /* Open kernel metadata */
811 if (ksess
->metadata
== NULL
&& ksess
->output_traces
) {
812 ret
= kernel_open_metadata(ksess
);
814 ret
= LTTNG_ERR_KERN_META_FAIL
;
819 /* Open kernel metadata stream */
820 if (ksess
->metadata
&& ksess
->metadata_stream_fd
< 0) {
821 ret
= kernel_open_metadata_stream(ksess
);
823 ERR("Kernel create metadata stream failed");
824 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
829 /* For each channel */
830 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
831 if (kchan
->stream_count
== 0) {
832 ret
= kernel_open_channel_stream(kchan
);
834 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
837 /* Update the stream global counter */
838 ksess
->stream_count_global
+= ret
;
842 /* Setup kernel consumer socket and send fds to it */
843 ret
= init_kernel_tracing(ksess
);
845 ret
= LTTNG_ERR_KERN_START_FAIL
;
849 /* This start the kernel tracing */
850 ret
= kernel_start_session(ksess
);
852 ret
= LTTNG_ERR_KERN_START_FAIL
;
856 /* Quiescent wait after starting trace */
857 kernel_wait_quiescent(kernel_tracer_fd
);
868 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
870 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
874 struct ltt_ust_session
*usess
;
876 usess
= session
->ust_session
;
881 case LTTNG_DOMAIN_KERNEL
:
883 ret
= channel_kernel_disable(session
->kernel_session
,
885 if (ret
!= LTTNG_OK
) {
889 kernel_wait_quiescent(kernel_tracer_fd
);
892 case LTTNG_DOMAIN_UST
:
894 struct ltt_ust_channel
*uchan
;
895 struct lttng_ht
*chan_ht
;
897 chan_ht
= usess
->domain_global
.channels
;
899 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
901 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
905 ret
= channel_ust_disable(usess
, uchan
);
906 if (ret
!= LTTNG_OK
) {
912 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
913 case LTTNG_DOMAIN_UST_EXEC_NAME
:
914 case LTTNG_DOMAIN_UST_PID
:
917 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
929 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
931 * The wpipe arguments is used as a notifier for the kernel thread.
933 int cmd_enable_channel(struct ltt_session
*session
,
934 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
937 struct ltt_ust_session
*usess
= session
->ust_session
;
938 struct lttng_ht
*chan_ht
;
944 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
949 * Don't try to enable a channel if the session has been started at
950 * some point in time before. The tracer does not allow it.
952 if (session
->has_been_started
) {
953 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
958 * If the session is a live session, remove the switch timer, the
959 * live timer does the same thing but sends also synchronisation
960 * beacons for inactive streams.
962 if (session
->live_timer
> 0) {
963 attr
->attr
.live_timer_interval
= session
->live_timer
;
964 attr
->attr
.switch_timer_interval
= 0;
968 * The ringbuffer (both in user space and kernel) behave badly in overwrite
969 * mode and with less than 2 subbuf so block it right away and send back an
970 * invalid attribute error.
972 if (attr
->attr
.overwrite
&& attr
->attr
.num_subbuf
< 2) {
973 ret
= LTTNG_ERR_INVALID
;
977 switch (domain
->type
) {
978 case LTTNG_DOMAIN_KERNEL
:
980 struct ltt_kernel_channel
*kchan
;
982 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
983 session
->kernel_session
);
985 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
986 if (attr
->name
[0] != '\0') {
987 session
->kernel_session
->has_non_default_channel
= 1;
990 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
993 if (ret
!= LTTNG_OK
) {
997 kernel_wait_quiescent(kernel_tracer_fd
);
1000 case LTTNG_DOMAIN_UST
:
1002 struct ltt_ust_channel
*uchan
;
1004 chan_ht
= usess
->domain_global
.channels
;
1006 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
1007 if (uchan
== NULL
) {
1008 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
1009 if (attr
->name
[0] != '\0') {
1010 usess
->has_non_default_channel
= 1;
1013 ret
= channel_ust_enable(usess
, uchan
);
1018 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1029 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1031 int cmd_disable_event(struct ltt_session
*session
, int domain
,
1033 struct lttng_event
*event
)
1038 DBG("Disable event command for event \'%s\'", event
->name
);
1040 event_name
= event
->name
;
1042 if (event
->loglevel_type
|| event
->loglevel
|| event
->enabled
1043 || event
->pid
|| event
->filter
|| event
->exclusion
) {
1044 return LTTNG_ERR_UNK
;
1046 /* Special handling for kernel domain all events. */
1047 if (domain
== LTTNG_DOMAIN_KERNEL
&& !strcmp(event_name
, "*")) {
1048 return disable_kevent_all(session
, domain
, channel_name
, event
);
1054 case LTTNG_DOMAIN_KERNEL
:
1056 struct ltt_kernel_channel
*kchan
;
1057 struct ltt_kernel_session
*ksess
;
1059 ksess
= session
->kernel_session
;
1062 * If a non-default channel has been created in the
1063 * session, explicitely require that -c chan_name needs
1066 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1067 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1071 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1072 if (kchan
== NULL
) {
1073 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1077 switch (event
->type
) {
1078 case LTTNG_EVENT_ALL
:
1079 case LTTNG_EVENT_TRACEPOINT
:
1080 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
1081 if (ret
!= LTTNG_OK
) {
1085 case LTTNG_EVENT_SYSCALL
:
1086 ret
= event_kernel_disable_syscall(kchan
, event_name
);
1087 if (ret
!= LTTNG_OK
) {
1092 ret
= LTTNG_ERR_UNK
;
1096 kernel_wait_quiescent(kernel_tracer_fd
);
1099 case LTTNG_DOMAIN_UST
:
1101 struct ltt_ust_channel
*uchan
;
1102 struct ltt_ust_session
*usess
;
1104 usess
= session
->ust_session
;
1107 * If a non-default channel has been created in the
1108 * session, explicitely require that -c chan_name needs
1111 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1112 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1116 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1118 if (uchan
== NULL
) {
1119 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1123 switch (event
->type
) {
1124 case LTTNG_EVENT_ALL
:
1125 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
1126 if (ret
!= LTTNG_OK
) {
1131 ret
= LTTNG_ERR_UNK
;
1135 DBG3("Disable UST event %s in channel %s completed", event_name
,
1139 case LTTNG_DOMAIN_LOG4J
:
1140 case LTTNG_DOMAIN_JUL
:
1143 struct ltt_ust_session
*usess
= session
->ust_session
;
1147 switch (event
->type
) {
1148 case LTTNG_EVENT_ALL
:
1151 ret
= LTTNG_ERR_UNK
;
1155 agt
= trace_ust_find_agent(usess
, domain
);
1157 ret
= -LTTNG_ERR_UST_EVENT_NOT_FOUND
;
1160 /* The wild card * means that everything should be disabled. */
1161 if (strncmp(event
->name
, "*", 1) == 0 && strlen(event
->name
) == 1) {
1162 ret
= event_agent_disable_all(usess
, agt
);
1164 ret
= event_agent_disable(usess
, agt
, event_name
);
1166 if (ret
!= LTTNG_OK
) {
1173 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1174 case LTTNG_DOMAIN_UST_PID
:
1175 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1178 ret
= LTTNG_ERR_UND
;
1190 * Command LTTNG_DISABLE_EVENT for event "*" processed by the client thread.
1193 int disable_kevent_all(struct ltt_session
*session
, int domain
,
1195 struct lttng_event
*event
)
1202 case LTTNG_DOMAIN_KERNEL
:
1204 struct ltt_kernel_session
*ksess
;
1205 struct ltt_kernel_channel
*kchan
;
1207 ksess
= session
->kernel_session
;
1210 * If a non-default channel has been created in the
1211 * session, explicitely require that -c chan_name needs
1214 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1215 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1219 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1220 if (kchan
== NULL
) {
1221 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1225 switch (event
->type
) {
1226 case LTTNG_EVENT_ALL
:
1227 ret
= event_kernel_disable_all(kchan
);
1228 if (ret
!= LTTNG_OK
) {
1232 case LTTNG_EVENT_SYSCALL
:
1233 ret
= event_kernel_disable_syscall(kchan
, "");
1234 if (ret
!= LTTNG_OK
) {
1239 ret
= LTTNG_ERR_UNK
;
1243 kernel_wait_quiescent(kernel_tracer_fd
);
1247 ret
= LTTNG_ERR_UND
;
1259 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1261 int cmd_add_context(struct ltt_session
*session
, int domain
,
1262 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1264 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1267 case LTTNG_DOMAIN_KERNEL
:
1268 assert(session
->kernel_session
);
1270 if (session
->kernel_session
->channel_count
== 0) {
1271 /* Create default channel */
1272 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1273 if (ret
!= LTTNG_OK
) {
1276 chan_kern_created
= 1;
1278 /* Add kernel context to kernel tracer */
1279 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1280 if (ret
!= LTTNG_OK
) {
1284 case LTTNG_DOMAIN_UST
:
1286 struct ltt_ust_session
*usess
= session
->ust_session
;
1287 unsigned int chan_count
;
1291 chan_count
= lttng_ht_get_count(usess
->domain_global
.channels
);
1292 if (chan_count
== 0) {
1293 struct lttng_channel
*attr
;
1294 /* Create default channel */
1295 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1297 ret
= LTTNG_ERR_FATAL
;
1301 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1302 if (ret
!= LTTNG_OK
) {
1307 chan_ust_created
= 1;
1310 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1311 if (ret
!= LTTNG_OK
) {
1317 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1318 case LTTNG_DOMAIN_UST_PID
:
1319 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1322 ret
= LTTNG_ERR_UND
;
1329 if (chan_kern_created
) {
1330 struct ltt_kernel_channel
*kchan
=
1331 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1332 session
->kernel_session
);
1333 /* Created previously, this should NOT fail. */
1335 kernel_destroy_channel(kchan
);
1338 if (chan_ust_created
) {
1339 struct ltt_ust_channel
*uchan
=
1340 trace_ust_find_channel_by_name(
1341 session
->ust_session
->domain_global
.channels
,
1342 DEFAULT_CHANNEL_NAME
);
1343 /* Created previously, this should NOT fail. */
1345 /* Remove from the channel list of the session. */
1346 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1348 trace_ust_destroy_channel(uchan
);
1353 static int validate_event_name(const char *name
)
1356 const char *c
= name
;
1357 const char *event_name_end
= c
+ LTTNG_SYMBOL_NAME_LEN
;
1360 * Make sure that unescaped wildcards are only used as the last
1361 * character of the event name.
1363 while (c
< event_name_end
) {
1371 if ((c
+ 1) < event_name_end
&& *(c
+ 1)) {
1372 /* Wildcard is not the last character */
1373 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1386 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1388 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1389 char *channel_name
, struct lttng_event
*event
,
1390 char *filter_expression
,
1391 struct lttng_filter_bytecode
*filter
,
1392 struct lttng_event_exclusion
*exclusion
,
1395 int ret
, channel_created
= 0;
1396 struct lttng_channel
*attr
;
1400 assert(channel_name
);
1402 DBG("Enable event command for event \'%s\'", event
->name
);
1404 /* Special handling for kernel domain all events. */
1405 if (domain
->type
== LTTNG_DOMAIN_KERNEL
&& !strcmp(event
->name
, "*")) {
1406 return enable_kevent_all(session
, domain
, channel_name
, event
,
1407 filter_expression
, filter
, wpipe
);
1410 ret
= validate_event_name(event
->name
);
1417 switch (domain
->type
) {
1418 case LTTNG_DOMAIN_KERNEL
:
1420 struct ltt_kernel_channel
*kchan
;
1423 * If a non-default channel has been created in the
1424 * session, explicitely require that -c chan_name needs
1427 if (session
->kernel_session
->has_non_default_channel
1428 && channel_name
[0] == '\0') {
1429 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1433 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1434 session
->kernel_session
);
1435 if (kchan
== NULL
) {
1436 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1437 LTTNG_BUFFER_GLOBAL
);
1439 ret
= LTTNG_ERR_FATAL
;
1442 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1444 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1445 if (ret
!= LTTNG_OK
) {
1451 channel_created
= 1;
1454 /* Get the newly created kernel channel pointer */
1455 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1456 session
->kernel_session
);
1457 if (kchan
== NULL
) {
1458 /* This sould not happen... */
1459 ret
= LTTNG_ERR_FATAL
;
1463 switch (event
->type
) {
1464 case LTTNG_EVENT_ALL
:
1465 case LTTNG_EVENT_PROBE
:
1466 case LTTNG_EVENT_FUNCTION
:
1467 case LTTNG_EVENT_FUNCTION_ENTRY
:
1468 case LTTNG_EVENT_TRACEPOINT
:
1469 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1470 if (ret
!= LTTNG_OK
) {
1471 if (channel_created
) {
1472 /* Let's not leak a useless channel. */
1473 kernel_destroy_channel(kchan
);
1478 case LTTNG_EVENT_SYSCALL
:
1479 ret
= event_kernel_enable_syscall(kchan
, event
->name
);
1480 if (ret
!= LTTNG_OK
) {
1485 ret
= LTTNG_ERR_UNK
;
1489 kernel_wait_quiescent(kernel_tracer_fd
);
1492 case LTTNG_DOMAIN_UST
:
1494 struct ltt_ust_channel
*uchan
;
1495 struct ltt_ust_session
*usess
= session
->ust_session
;
1500 * If a non-default channel has been created in the
1501 * session, explicitely require that -c chan_name needs
1504 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1505 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1509 /* Get channel from global UST domain */
1510 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1512 if (uchan
== NULL
) {
1513 /* Create default channel */
1514 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1515 usess
->buffer_type
);
1517 ret
= LTTNG_ERR_FATAL
;
1520 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1522 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1523 if (ret
!= LTTNG_OK
) {
1529 /* Get the newly created channel reference back */
1530 uchan
= trace_ust_find_channel_by_name(
1531 usess
->domain_global
.channels
, channel_name
);
1535 /* At this point, the session and channel exist on the tracer */
1536 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
,
1537 filter_expression
, filter
, exclusion
);
1538 if (ret
!= LTTNG_OK
) {
1543 case LTTNG_DOMAIN_LOG4J
:
1544 case LTTNG_DOMAIN_JUL
:
1546 const char *default_event_name
, *default_chan_name
;
1548 struct lttng_event uevent
;
1549 struct lttng_domain tmp_dom
;
1550 struct ltt_ust_session
*usess
= session
->ust_session
;
1554 agt
= trace_ust_find_agent(usess
, domain
->type
);
1556 agt
= agent_create(domain
->type
);
1558 ret
= -LTTNG_ERR_NOMEM
;
1561 agent_add(agt
, usess
->agents
);
1564 /* Create the default tracepoint. */
1565 memset(&uevent
, 0, sizeof(uevent
));
1566 uevent
.type
= LTTNG_EVENT_TRACEPOINT
;
1567 uevent
.loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
1568 default_event_name
= event_get_default_agent_ust_name(domain
->type
);
1569 if (!default_event_name
) {
1570 ret
= -LTTNG_ERR_FATAL
;
1573 strncpy(uevent
.name
, default_event_name
, sizeof(uevent
.name
));
1574 uevent
.name
[sizeof(uevent
.name
) - 1] = '\0';
1577 * The domain type is changed because we are about to enable the
1578 * default channel and event for the JUL domain that are hardcoded.
1579 * This happens in the UST domain.
1581 memcpy(&tmp_dom
, domain
, sizeof(tmp_dom
));
1582 tmp_dom
.type
= LTTNG_DOMAIN_UST
;
1584 if (domain
->type
== LTTNG_DOMAIN_LOG4J
) {
1585 default_chan_name
= DEFAULT_LOG4J_CHANNEL_NAME
;
1587 default_chan_name
= DEFAULT_JUL_CHANNEL_NAME
;
1590 ret
= cmd_enable_event(session
, &tmp_dom
, (char *) default_chan_name
,
1591 &uevent
, filter_expression
, filter
, NULL
, wpipe
);
1592 if (ret
!= LTTNG_OK
&& ret
!= LTTNG_ERR_UST_EVENT_ENABLED
) {
1596 /* The wild card * means that everything should be enabled. */
1597 if (strncmp(event
->name
, "*", 1) == 0 && strlen(event
->name
) == 1) {
1598 ret
= event_agent_enable_all(usess
, agt
, event
, filter
);
1600 ret
= event_agent_enable(usess
, agt
, event
, filter
);
1602 if (ret
!= LTTNG_OK
) {
1609 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1610 case LTTNG_DOMAIN_UST_PID
:
1611 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1614 ret
= LTTNG_ERR_UND
;
1626 * Command LTTNG_ENABLE_EVENT for event "*" processed by the client thread.
1629 int enable_kevent_all(struct ltt_session
*session
,
1630 struct lttng_domain
*domain
, char *channel_name
,
1631 struct lttng_event
*event
,
1632 char *filter_expression
,
1633 struct lttng_filter_bytecode
*filter
, int wpipe
)
1636 struct lttng_channel
*attr
;
1639 assert(channel_name
);
1643 switch (domain
->type
) {
1644 case LTTNG_DOMAIN_KERNEL
:
1646 struct ltt_kernel_channel
*kchan
;
1648 assert(session
->kernel_session
);
1651 * If a non-default channel has been created in the
1652 * session, explicitely require that -c chan_name needs
1655 if (session
->kernel_session
->has_non_default_channel
1656 && channel_name
[0] == '\0') {
1657 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1661 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1662 session
->kernel_session
);
1663 if (kchan
== NULL
) {
1664 /* Create default channel */
1665 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1666 LTTNG_BUFFER_GLOBAL
);
1668 ret
= LTTNG_ERR_FATAL
;
1671 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1673 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1674 if (ret
!= LTTNG_OK
) {
1680 /* Get the newly created kernel channel pointer */
1681 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1682 session
->kernel_session
);
1686 switch (event
->type
) {
1687 case LTTNG_EVENT_SYSCALL
:
1688 ret
= event_kernel_enable_syscall(kchan
, "");
1689 if (ret
!= LTTNG_OK
) {
1693 case LTTNG_EVENT_TRACEPOINT
:
1695 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1696 * events already registered to the channel.
1698 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1700 case LTTNG_EVENT_ALL
:
1701 /* Enable syscalls and tracepoints */
1702 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1705 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1709 /* Manage return value */
1710 if (ret
!= LTTNG_OK
) {
1712 * On error, cmd_enable_channel call will take care of destroying
1713 * the created channel if it was needed.
1718 kernel_wait_quiescent(kernel_tracer_fd
);
1722 ret
= LTTNG_ERR_UND
;
1735 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1737 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1740 ssize_t nb_events
= 0;
1743 case LTTNG_DOMAIN_KERNEL
:
1744 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1745 if (nb_events
< 0) {
1746 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1750 case LTTNG_DOMAIN_UST
:
1751 nb_events
= ust_app_list_events(events
);
1752 if (nb_events
< 0) {
1753 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1757 case LTTNG_DOMAIN_LOG4J
:
1758 case LTTNG_DOMAIN_JUL
:
1759 nb_events
= agent_list_events(events
, domain
);
1760 if (nb_events
< 0) {
1761 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1766 ret
= LTTNG_ERR_UND
;
1773 /* Return negative value to differentiate return code */
1778 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1780 ssize_t
cmd_list_tracepoint_fields(int domain
,
1781 struct lttng_event_field
**fields
)
1784 ssize_t nb_fields
= 0;
1787 case LTTNG_DOMAIN_UST
:
1788 nb_fields
= ust_app_list_event_fields(fields
);
1789 if (nb_fields
< 0) {
1790 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1794 case LTTNG_DOMAIN_KERNEL
:
1795 default: /* fall-through */
1796 ret
= LTTNG_ERR_UND
;
1803 /* Return negative value to differentiate return code */
1807 ssize_t
cmd_list_syscalls(struct lttng_event
**events
)
1809 return syscall_table_list(events
);
1813 * Command LTTNG_START_TRACE processed by the client thread.
1815 int cmd_start_trace(struct ltt_session
*session
)
1818 unsigned long nb_chan
= 0;
1819 struct ltt_kernel_session
*ksession
;
1820 struct ltt_ust_session
*usess
;
1824 /* Ease our life a bit ;) */
1825 ksession
= session
->kernel_session
;
1826 usess
= session
->ust_session
;
1828 /* Is the session already started? */
1829 if (session
->active
) {
1830 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1835 * Starting a session without channel is useless since after that it's not
1836 * possible to enable channel thus inform the client.
1838 if (usess
&& usess
->domain_global
.channels
) {
1840 nb_chan
+= lttng_ht_get_count(usess
->domain_global
.channels
);
1844 nb_chan
+= ksession
->channel_count
;
1847 ret
= LTTNG_ERR_NO_CHANNEL
;
1851 /* Kernel tracing */
1852 if (ksession
!= NULL
) {
1853 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1854 if (ret
!= LTTNG_OK
) {
1859 /* Flag session that trace should start automatically */
1862 * Even though the start trace might fail, flag this session active so
1863 * other application coming in are started by default.
1867 ret
= ust_app_start_trace_all(usess
);
1869 ret
= LTTNG_ERR_UST_START_FAIL
;
1874 /* Flag this after a successful start. */
1875 session
->has_been_started
= 1;
1876 session
->active
= 1;
1885 * Command LTTNG_STOP_TRACE processed by the client thread.
1887 int cmd_stop_trace(struct ltt_session
*session
)
1890 struct ltt_kernel_channel
*kchan
;
1891 struct ltt_kernel_session
*ksession
;
1892 struct ltt_ust_session
*usess
;
1897 ksession
= session
->kernel_session
;
1898 usess
= session
->ust_session
;
1900 /* Session is not active. Skip everythong and inform the client. */
1901 if (!session
->active
) {
1902 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1907 if (ksession
&& ksession
->active
) {
1908 DBG("Stop kernel tracing");
1910 /* Flush metadata if exist */
1911 if (ksession
->metadata_stream_fd
>= 0) {
1912 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1914 ERR("Kernel metadata flush failed");
1918 /* Flush all buffers before stopping */
1919 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1920 ret
= kernel_flush_buffer(kchan
);
1922 ERR("Kernel flush buffer error");
1926 ret
= kernel_stop_session(ksession
);
1928 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1932 kernel_wait_quiescent(kernel_tracer_fd
);
1934 ksession
->active
= 0;
1937 if (usess
&& usess
->active
) {
1939 * Even though the stop trace might fail, flag this session inactive so
1940 * other application coming in are not started by default.
1944 ret
= ust_app_stop_trace_all(usess
);
1946 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1951 /* Flag inactive after a successful stop. */
1952 session
->active
= 0;
1960 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1962 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1963 size_t nb_uri
, struct lttng_uri
*uris
)
1966 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1967 struct ltt_ust_session
*usess
= session
->ust_session
;
1968 struct consumer_output
*consumer
= NULL
;
1974 /* Can't set consumer URI if the session is active. */
1975 if (session
->active
) {
1976 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1981 * This case switch makes sure the domain session has a temporary consumer
1982 * so the URL can be set.
1986 /* Code flow error. A session MUST always have a consumer object */
1987 assert(session
->consumer
);
1989 * The URL will be added to the tracing session consumer instead of a
1990 * specific domain consumer.
1992 consumer
= session
->consumer
;
1994 case LTTNG_DOMAIN_KERNEL
:
1995 /* Code flow error if we don't have a kernel session here. */
1997 assert(ksess
->consumer
);
1998 consumer
= ksess
->consumer
;
2000 case LTTNG_DOMAIN_UST
:
2001 /* Code flow error if we don't have a kernel session here. */
2003 assert(usess
->consumer
);
2004 consumer
= usess
->consumer
;
2008 for (i
= 0; i
< nb_uri
; i
++) {
2009 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
2010 if (ret
!= LTTNG_OK
) {
2016 * Make sure to set the session in output mode after we set URI since a
2017 * session can be created without URL (thus flagged in no output mode).
2019 session
->output_traces
= 1;
2021 ksess
->output_traces
= 1;
2023 usess
->output_traces
= 1;
2034 * Command LTTNG_CREATE_SESSION processed by the client thread.
2036 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
2037 size_t nb_uri
, lttng_sock_cred
*creds
, unsigned int live_timer
)
2040 struct ltt_session
*session
;
2046 * Verify if the session already exist
2048 * XXX: There is no need for the session lock list here since the caller
2049 * (process_client_msg) is holding it. We might want to change that so a
2050 * single command does not lock the entire session list.
2052 session
= session_find_by_name(name
);
2053 if (session
!= NULL
) {
2054 ret
= LTTNG_ERR_EXIST_SESS
;
2058 /* Create tracing session in the registry */
2059 ret
= session_create(name
, LTTNG_SOCK_GET_UID_CRED(creds
),
2060 LTTNG_SOCK_GET_GID_CRED(creds
));
2061 if (ret
!= LTTNG_OK
) {
2066 * Get the newly created session pointer back
2068 * XXX: There is no need for the session lock list here since the caller
2069 * (process_client_msg) is holding it. We might want to change that so a
2070 * single command does not lock the entire session list.
2072 session
= session_find_by_name(name
);
2075 session
->live_timer
= live_timer
;
2076 /* Create default consumer output for the session not yet created. */
2077 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
2078 if (session
->consumer
== NULL
) {
2079 ret
= LTTNG_ERR_FATAL
;
2080 goto consumer_error
;
2084 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
2085 if (ret
!= LTTNG_OK
) {
2086 goto consumer_error
;
2088 session
->output_traces
= 1;
2090 session
->output_traces
= 0;
2091 DBG2("Session %s created with no output", session
->name
);
2094 session
->consumer
->enabled
= 1;
2099 session_destroy(session
);
2106 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2108 int cmd_create_session_snapshot(char *name
, struct lttng_uri
*uris
,
2109 size_t nb_uri
, lttng_sock_cred
*creds
)
2112 struct ltt_session
*session
;
2113 struct snapshot_output
*new_output
= NULL
;
2119 * Create session in no output mode with URIs set to NULL. The uris we've
2120 * received are for a default snapshot output if one.
2122 ret
= cmd_create_session_uri(name
, NULL
, 0, creds
, -1);
2123 if (ret
!= LTTNG_OK
) {
2127 /* Get the newly created session pointer back. This should NEVER fail. */
2128 session
= session_find_by_name(name
);
2131 /* Flag session for snapshot mode. */
2132 session
->snapshot_mode
= 1;
2134 /* Skip snapshot output creation if no URI is given. */
2139 new_output
= snapshot_output_alloc();
2141 ret
= LTTNG_ERR_NOMEM
;
2142 goto error_snapshot_alloc
;
2145 ret
= snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE
, NULL
,
2146 uris
, nb_uri
, session
->consumer
, new_output
, &session
->snapshot
);
2148 if (ret
== -ENOMEM
) {
2149 ret
= LTTNG_ERR_NOMEM
;
2151 ret
= LTTNG_ERR_INVALID
;
2153 goto error_snapshot
;
2157 snapshot_add_output(&session
->snapshot
, new_output
);
2164 snapshot_output_destroy(new_output
);
2165 error_snapshot_alloc
:
2166 session_destroy(session
);
2172 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2174 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
2177 struct ltt_ust_session
*usess
;
2178 struct ltt_kernel_session
*ksess
;
2183 usess
= session
->ust_session
;
2184 ksess
= session
->kernel_session
;
2186 /* Clean kernel session teardown */
2187 kernel_destroy_session(ksess
);
2189 /* UST session teardown */
2191 /* Close any relayd session */
2192 consumer_output_send_destroy_relayd(usess
->consumer
);
2194 /* Destroy every UST application related to this session. */
2195 ret
= ust_app_destroy_trace_all(usess
);
2197 ERR("Error in ust_app_destroy_trace_all");
2200 /* Clean up the rest. */
2201 trace_ust_destroy_session(usess
);
2205 * Must notify the kernel thread here to update it's poll set in order to
2206 * remove the channel(s)' fd just destroyed.
2208 ret
= notify_thread_pipe(wpipe
);
2210 PERROR("write kernel poll pipe");
2213 ret
= session_destroy(session
);
2219 * Command LTTNG_CALIBRATE processed by the client thread.
2221 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
2226 case LTTNG_DOMAIN_KERNEL
:
2228 struct lttng_kernel_calibrate kcalibrate
;
2230 switch (calibrate
->type
) {
2231 case LTTNG_CALIBRATE_FUNCTION
:
2233 /* Default and only possible calibrate option. */
2234 kcalibrate
.type
= LTTNG_KERNEL_CALIBRATE_KRETPROBE
;
2238 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2240 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
2245 case LTTNG_DOMAIN_UST
:
2247 struct lttng_ust_calibrate ucalibrate
;
2249 switch (calibrate
->type
) {
2250 case LTTNG_CALIBRATE_FUNCTION
:
2252 /* Default and only possible calibrate option. */
2253 ucalibrate
.type
= LTTNG_UST_CALIBRATE_TRACEPOINT
;
2257 ret
= ust_app_calibrate_glb(&ucalibrate
);
2259 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
2265 ret
= LTTNG_ERR_UND
;
2276 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2278 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2279 const char *sock_path
, struct consumer_data
*cdata
)
2282 struct consumer_socket
*socket
= NULL
;
2289 case LTTNG_DOMAIN_KERNEL
:
2291 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2295 /* Can't register a consumer if there is already one */
2296 if (ksess
->consumer_fds_sent
!= 0) {
2297 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2301 sock
= lttcomm_connect_unix_sock(sock_path
);
2303 ret
= LTTNG_ERR_CONNECT_FAIL
;
2306 cdata
->cmd_sock
= sock
;
2308 socket
= consumer_allocate_socket(&cdata
->cmd_sock
);
2309 if (socket
== NULL
) {
2312 PERROR("close register consumer");
2314 cdata
->cmd_sock
= -1;
2315 ret
= LTTNG_ERR_FATAL
;
2319 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
2320 if (socket
->lock
== NULL
) {
2321 PERROR("zmalloc pthread mutex");
2322 ret
= LTTNG_ERR_FATAL
;
2325 pthread_mutex_init(socket
->lock
, NULL
);
2326 socket
->registered
= 1;
2329 consumer_add_socket(socket
, ksess
->consumer
);
2332 pthread_mutex_lock(&cdata
->pid_mutex
);
2334 pthread_mutex_unlock(&cdata
->pid_mutex
);
2339 /* TODO: Userspace tracing */
2340 ret
= LTTNG_ERR_UND
;
2348 consumer_destroy_socket(socket
);
2354 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2356 ssize_t
cmd_list_domains(struct ltt_session
*session
,
2357 struct lttng_domain
**domains
)
2362 struct lttng_ht_iter iter
;
2364 if (session
->kernel_session
!= NULL
) {
2365 DBG3("Listing domains found kernel domain");
2369 if (session
->ust_session
!= NULL
) {
2370 DBG3("Listing domains found UST global domain");
2373 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
2375 if (agt
->being_used
) {
2381 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2382 if (*domains
== NULL
) {
2383 ret
= LTTNG_ERR_FATAL
;
2387 if (session
->kernel_session
!= NULL
) {
2388 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2392 if (session
->ust_session
!= NULL
) {
2393 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2394 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2397 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
2399 if (agt
->being_used
) {
2400 (*domains
)[index
].type
= agt
->domain
;
2401 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2410 /* Return negative value to differentiate return code */
2416 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2418 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
2419 struct lttng_channel
**channels
)
2422 ssize_t nb_chan
= 0;
2425 case LTTNG_DOMAIN_KERNEL
:
2426 if (session
->kernel_session
!= NULL
) {
2427 nb_chan
= session
->kernel_session
->channel_count
;
2429 DBG3("Number of kernel channels %zd", nb_chan
);
2431 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2434 case LTTNG_DOMAIN_UST
:
2435 if (session
->ust_session
!= NULL
) {
2436 nb_chan
= lttng_ht_get_count(
2437 session
->ust_session
->domain_global
.channels
);
2439 DBG3("Number of UST global channels %zd", nb_chan
);
2441 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2446 ret
= LTTNG_ERR_UND
;
2451 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2452 if (*channels
== NULL
) {
2453 ret
= LTTNG_ERR_FATAL
;
2457 list_lttng_channels(domain
, session
, *channels
);
2463 /* Return negative value to differentiate return code */
2468 * Command LTTNG_LIST_EVENTS processed by the client thread.
2470 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2471 char *channel_name
, struct lttng_event
**events
)
2474 ssize_t nb_event
= 0;
2477 case LTTNG_DOMAIN_KERNEL
:
2478 if (session
->kernel_session
!= NULL
) {
2479 nb_event
= list_lttng_kernel_events(channel_name
,
2480 session
->kernel_session
, events
);
2483 case LTTNG_DOMAIN_UST
:
2485 if (session
->ust_session
!= NULL
) {
2486 nb_event
= list_lttng_ust_global_events(channel_name
,
2487 &session
->ust_session
->domain_global
, events
);
2491 case LTTNG_DOMAIN_LOG4J
:
2492 case LTTNG_DOMAIN_JUL
:
2493 if (session
->ust_session
) {
2494 struct lttng_ht_iter iter
;
2497 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
,
2498 &iter
.iter
, agt
, node
.node
) {
2499 nb_event
= list_lttng_agent_events(agt
, events
);
2504 ret
= LTTNG_ERR_UND
;
2511 /* Return negative value to differentiate return code */
2516 * Using the session list, filled a lttng_session array to send back to the
2517 * client for session listing.
2519 * The session list lock MUST be acquired before calling this function. Use
2520 * session_lock_list() and session_unlock_list().
2522 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2527 struct ltt_session
*session
;
2528 struct ltt_session_list
*list
= session_get_list();
2530 DBG("Getting all available session for UID %d GID %d",
2533 * Iterate over session list and append data after the control struct in
2536 cds_list_for_each_entry(session
, &list
->head
, list
) {
2538 * Only list the sessions the user can control.
2540 if (!session_access_ok(session
, uid
, gid
)) {
2544 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2545 struct ltt_ust_session
*usess
= session
->ust_session
;
2547 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2548 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2549 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2550 ret
= build_network_session_path(sessions
[i
].path
,
2551 sizeof(sessions
[i
].path
), session
);
2553 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
2554 session
->consumer
->dst
.trace_path
);
2557 PERROR("snprintf session path");
2561 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2562 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2563 sessions
[i
].enabled
= session
->active
;
2564 sessions
[i
].snapshot_mode
= session
->snapshot_mode
;
2565 sessions
[i
].live_timer_interval
= session
->live_timer
;
2571 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2572 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2574 int cmd_data_pending(struct ltt_session
*session
)
2577 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2578 struct ltt_ust_session
*usess
= session
->ust_session
;
2582 /* Session MUST be stopped to ask for data availability. */
2583 if (session
->active
) {
2584 ret
= LTTNG_ERR_SESSION_STARTED
;
2588 * If stopped, just make sure we've started before else the above call
2589 * will always send that there is data pending.
2591 * The consumer assumes that when the data pending command is received,
2592 * the trace has been started before or else no output data is written
2593 * by the streams which is a condition for data pending. So, this is
2594 * *VERY* important that we don't ask the consumer before a start
2597 if (!session
->has_been_started
) {
2603 if (ksess
&& ksess
->consumer
) {
2604 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2606 /* Data is still being extracted for the kernel. */
2611 if (usess
&& usess
->consumer
) {
2612 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2614 /* Data is still being extracted for the kernel. */
2619 /* Data is ready to be read by a viewer */
2627 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2629 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2631 int cmd_snapshot_add_output(struct ltt_session
*session
,
2632 struct lttng_snapshot_output
*output
, uint32_t *id
)
2635 struct snapshot_output
*new_output
;
2640 DBG("Cmd snapshot add output for session %s", session
->name
);
2643 * Permission denied to create an output if the session is not
2644 * set in no output mode.
2646 if (session
->output_traces
) {
2647 ret
= LTTNG_ERR_EPERM
;
2651 /* Only one output is allowed until we have the "tee" feature. */
2652 if (session
->snapshot
.nb_output
== 1) {
2653 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
2657 new_output
= snapshot_output_alloc();
2659 ret
= LTTNG_ERR_NOMEM
;
2663 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2664 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
2665 &session
->snapshot
);
2667 if (ret
== -ENOMEM
) {
2668 ret
= LTTNG_ERR_NOMEM
;
2670 ret
= LTTNG_ERR_INVALID
;
2676 snapshot_add_output(&session
->snapshot
, new_output
);
2678 *id
= new_output
->id
;
2685 snapshot_output_destroy(new_output
);
2691 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2693 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2695 int cmd_snapshot_del_output(struct ltt_session
*session
,
2696 struct lttng_snapshot_output
*output
)
2699 struct snapshot_output
*sout
= NULL
;
2707 * Permission denied to create an output if the session is not
2708 * set in no output mode.
2710 if (session
->output_traces
) {
2711 ret
= LTTNG_ERR_EPERM
;
2716 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
2718 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
2719 } else if (*output
->name
!= '\0') {
2720 DBG("Cmd snapshot del output name %s for session %s", output
->name
,
2722 sout
= snapshot_find_output_by_name(output
->name
, &session
->snapshot
);
2725 ret
= LTTNG_ERR_INVALID
;
2729 snapshot_delete_output(&session
->snapshot
, sout
);
2730 snapshot_output_destroy(sout
);
2739 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2741 * If no output is available, outputs is untouched and 0 is returned.
2743 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2745 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
2746 struct lttng_snapshot_output
**outputs
)
2749 struct lttng_snapshot_output
*list
;
2750 struct lttng_ht_iter iter
;
2751 struct snapshot_output
*output
;
2756 DBG("Cmd snapshot list outputs for session %s", session
->name
);
2759 * Permission denied to create an output if the session is not
2760 * set in no output mode.
2762 if (session
->output_traces
) {
2763 ret
= LTTNG_ERR_EPERM
;
2767 if (session
->snapshot
.nb_output
== 0) {
2772 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
2774 ret
= LTTNG_ERR_NOMEM
;
2778 /* Copy list from session to the new list object. */
2779 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
2780 output
, node
.node
) {
2781 assert(output
->consumer
);
2782 list
[idx
].id
= output
->id
;
2783 list
[idx
].max_size
= output
->max_size
;
2784 strncpy(list
[idx
].name
, output
->name
, sizeof(list
[idx
].name
));
2785 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
2786 strncpy(list
[idx
].ctrl_url
, output
->consumer
->dst
.trace_path
,
2787 sizeof(list
[idx
].ctrl_url
));
2790 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
2791 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
2793 ret
= LTTNG_ERR_NOMEM
;
2798 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
2799 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
2801 ret
= LTTNG_ERR_NOMEM
;
2809 return session
->snapshot
.nb_output
;
2818 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2819 * snapshot output is *not* set with a remote destination.
2821 * Return 0 on success or a LTTNG_ERR code.
2823 static int set_relayd_for_snapshot(struct consumer_output
*consumer
,
2824 struct snapshot_output
*snap_output
, struct ltt_session
*session
)
2827 struct lttng_ht_iter iter
;
2828 struct consumer_socket
*socket
;
2831 assert(snap_output
);
2834 DBG2("Set relayd object from snapshot output");
2836 /* Ignore if snapshot consumer output is not network. */
2837 if (snap_output
->consumer
->type
!= CONSUMER_DST_NET
) {
2842 * For each consumer socket, create and send the relayd object of the
2846 cds_lfht_for_each_entry(snap_output
->consumer
->socks
->ht
, &iter
.iter
,
2847 socket
, node
.node
) {
2848 ret
= send_consumer_relayd_sockets(0, session
->id
,
2849 snap_output
->consumer
, socket
,
2850 session
->name
, session
->hostname
,
2851 session
->live_timer
);
2852 if (ret
!= LTTNG_OK
) {
2864 * Record a kernel snapshot.
2866 * Return LTTNG_OK on success or a LTTNG_ERR code.
2868 static int record_kernel_snapshot(struct ltt_kernel_session
*ksess
,
2869 struct snapshot_output
*output
, struct ltt_session
*session
,
2870 int wait
, uint64_t max_stream_size
)
2878 /* Get the datetime for the snapshot output directory. */
2879 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
2880 sizeof(output
->datetime
));
2882 ret
= LTTNG_ERR_INVALID
;
2887 * Copy kernel session sockets so we can communicate with the right
2888 * consumer for the snapshot record command.
2890 ret
= consumer_copy_sockets(output
->consumer
, ksess
->consumer
);
2892 ret
= LTTNG_ERR_NOMEM
;
2896 ret
= set_relayd_for_snapshot(ksess
->consumer
, output
, session
);
2897 if (ret
!= LTTNG_OK
) {
2898 goto error_snapshot
;
2901 ret
= kernel_snapshot_record(ksess
, output
, wait
, max_stream_size
);
2902 if (ret
!= LTTNG_OK
) {
2903 goto error_snapshot
;
2909 /* Clean up copied sockets so this output can use some other later on. */
2910 consumer_destroy_output_sockets(output
->consumer
);
2916 * Record a UST snapshot.
2918 * Return 0 on success or a LTTNG_ERR error code.
2920 static int record_ust_snapshot(struct ltt_ust_session
*usess
,
2921 struct snapshot_output
*output
, struct ltt_session
*session
,
2922 int wait
, uint64_t max_stream_size
)
2930 /* Get the datetime for the snapshot output directory. */
2931 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
2932 sizeof(output
->datetime
));
2934 ret
= LTTNG_ERR_INVALID
;
2939 * Copy UST session sockets so we can communicate with the right
2940 * consumer for the snapshot record command.
2942 ret
= consumer_copy_sockets(output
->consumer
, usess
->consumer
);
2944 ret
= LTTNG_ERR_NOMEM
;
2948 ret
= set_relayd_for_snapshot(usess
->consumer
, output
, session
);
2949 if (ret
!= LTTNG_OK
) {
2950 goto error_snapshot
;
2953 ret
= ust_app_snapshot_record(usess
, output
, wait
, max_stream_size
);
2957 ret
= LTTNG_ERR_INVALID
;
2960 ret
= LTTNG_ERR_SNAPSHOT_NODATA
;
2963 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
2966 goto error_snapshot
;
2972 /* Clean up copied sockets so this output can use some other later on. */
2973 consumer_destroy_output_sockets(output
->consumer
);
2979 * Return the biggest subbuffer size of all channels in the given session.
2981 static uint64_t get_session_max_subbuf_size(struct ltt_session
*session
)
2983 uint64_t max_size
= 0;
2987 if (session
->kernel_session
) {
2988 struct ltt_kernel_channel
*chan
;
2989 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2992 * For each channel, add to the max size the size of each subbuffer
2993 * multiplied by their sized.
2995 cds_list_for_each_entry(chan
, &ksess
->channel_list
.head
, list
) {
2996 if (chan
->channel
->attr
.subbuf_size
> max_size
) {
2997 max_size
= chan
->channel
->attr
.subbuf_size
;
3002 if (session
->ust_session
) {
3003 struct lttng_ht_iter iter
;
3004 struct ltt_ust_channel
*uchan
;
3005 struct ltt_ust_session
*usess
= session
->ust_session
;
3007 cds_lfht_for_each_entry(usess
->domain_global
.channels
->ht
, &iter
.iter
,
3009 if (uchan
->attr
.subbuf_size
> max_size
) {
3010 max_size
= uchan
->attr
.subbuf_size
;
3019 * Returns the total number of streams for a session or a negative value
3022 static unsigned int get_session_nb_streams(struct ltt_session
*session
)
3024 unsigned int total_streams
= 0;
3026 if (session
->kernel_session
) {
3027 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3029 total_streams
+= ksess
->stream_count_global
;
3032 if (session
->ust_session
) {
3033 struct ltt_ust_session
*usess
= session
->ust_session
;
3035 total_streams
+= ust_app_get_nb_stream(usess
);
3038 return total_streams
;
3042 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3044 * The wait parameter is ignored so this call always wait for the snapshot to
3045 * complete before returning.
3047 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3049 int cmd_snapshot_record(struct ltt_session
*session
,
3050 struct lttng_snapshot_output
*output
, int wait
)
3053 unsigned int use_tmp_output
= 0;
3054 struct snapshot_output tmp_output
;
3055 unsigned int nb_streams
, snapshot_success
= 0;
3056 uint64_t session_max_size
= 0, max_stream_size
= 0;
3061 DBG("Cmd snapshot record for session %s", session
->name
);
3064 * Permission denied to create an output if the session is not
3065 * set in no output mode.
3067 if (session
->output_traces
) {
3068 ret
= LTTNG_ERR_EPERM
;
3072 /* The session needs to be started at least once. */
3073 if (!session
->has_been_started
) {
3074 ret
= LTTNG_ERR_START_SESSION_ONCE
;
3078 /* Use temporary output for the session. */
3079 if (*output
->ctrl_url
!= '\0') {
3080 ret
= snapshot_output_init(output
->max_size
, output
->name
,
3081 output
->ctrl_url
, output
->data_url
, session
->consumer
,
3084 if (ret
== -ENOMEM
) {
3085 ret
= LTTNG_ERR_NOMEM
;
3087 ret
= LTTNG_ERR_INVALID
;
3091 /* Use the global session count for the temporary snapshot. */
3092 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3097 * Get the session maximum size for a snapshot meaning it will compute the
3098 * size of all streams from all domain.
3100 max_stream_size
= get_session_max_subbuf_size(session
);
3102 nb_streams
= get_session_nb_streams(session
);
3105 * The maximum size of the snapshot is the number of streams multiplied
3106 * by the biggest subbuf size of all channels in a session which is the
3107 * maximum stream size available for each stream. The session max size
3108 * is now checked against the snapshot max size value given by the user
3109 * and if lower, an error is returned.
3111 session_max_size
= max_stream_size
* nb_streams
;
3114 DBG3("Snapshot max size is %" PRIu64
" for max stream size of %" PRIu64
,
3115 session_max_size
, max_stream_size
);
3118 * If we use a temporary output, check right away if the max size fits else
3119 * for each output the max size will be checked.
3121 if (use_tmp_output
&&
3122 (tmp_output
.max_size
!= 0 &&
3123 tmp_output
.max_size
< session_max_size
)) {
3124 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3128 if (session
->kernel_session
) {
3129 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3131 if (use_tmp_output
) {
3132 ret
= record_kernel_snapshot(ksess
, &tmp_output
, session
,
3133 wait
, max_stream_size
);
3134 if (ret
!= LTTNG_OK
) {
3137 snapshot_success
= 1;
3139 struct snapshot_output
*sout
;
3140 struct lttng_ht_iter iter
;
3143 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
3144 &iter
.iter
, sout
, node
.node
) {
3146 * Make a local copy of the output and assign the possible
3147 * temporary value given by the caller.
3149 memset(&tmp_output
, 0, sizeof(tmp_output
));
3150 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
3152 /* Use temporary max size. */
3153 if (output
->max_size
!= (uint64_t) -1ULL) {
3154 tmp_output
.max_size
= output
->max_size
;
3157 if (tmp_output
.max_size
!= 0 &&
3158 tmp_output
.max_size
< session_max_size
) {
3160 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3164 /* Use temporary name. */
3165 if (*output
->name
!= '\0') {
3166 strncpy(tmp_output
.name
, output
->name
,
3167 sizeof(tmp_output
.name
));
3170 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3172 ret
= record_kernel_snapshot(ksess
, &tmp_output
,
3173 session
, wait
, max_stream_size
);
3174 if (ret
!= LTTNG_OK
) {
3178 snapshot_success
= 1;
3184 if (session
->ust_session
) {
3185 struct ltt_ust_session
*usess
= session
->ust_session
;
3187 if (use_tmp_output
) {
3188 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
3189 wait
, max_stream_size
);
3190 if (ret
!= LTTNG_OK
) {
3193 snapshot_success
= 1;
3195 struct snapshot_output
*sout
;
3196 struct lttng_ht_iter iter
;
3199 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
3200 &iter
.iter
, sout
, node
.node
) {
3202 * Make a local copy of the output and assign the possible
3203 * temporary value given by the caller.
3205 memset(&tmp_output
, 0, sizeof(tmp_output
));
3206 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
3208 /* Use temporary max size. */
3209 if (output
->max_size
!= (uint64_t) -1ULL) {
3210 tmp_output
.max_size
= output
->max_size
;
3213 if (tmp_output
.max_size
!= 0 &&
3214 tmp_output
.max_size
< session_max_size
) {
3216 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3220 /* Use temporary name. */
3221 if (*output
->name
!= '\0') {
3222 strncpy(tmp_output
.name
, output
->name
,
3223 sizeof(tmp_output
.name
));
3226 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3228 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
3229 wait
, max_stream_size
);
3230 if (ret
!= LTTNG_OK
) {
3234 snapshot_success
= 1;
3240 if (snapshot_success
) {
3241 session
->snapshot
.nb_snapshot
++;
3243 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
3251 * Init command subsystem.
3256 * Set network sequence index to 1 for streams to match a relayd
3257 * socket on the consumer side.
3259 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
3260 relayd_net_seq_idx
= 1;
3261 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
3263 DBG("Command subsystem initialized");