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.
23 #include <urcu/list.h>
24 #include <urcu/uatomic.h>
26 #include <common/defaults.h>
27 #include <common/common.h>
28 #include <common/sessiond-comm/sessiond-comm.h>
29 #include <common/relayd/relayd.h>
30 #include <common/utils.h>
35 #include "health-sessiond.h"
37 #include "kernel-consumer.h"
38 #include "lttng-sessiond.h"
45 * Used to keep a unique index for each relayd socket created where this value
46 * is associated with streams on the consumer so it can match the right relayd
47 * to send to. It must be accessed with the relayd_net_seq_idx_lock
50 static pthread_mutex_t relayd_net_seq_idx_lock
= PTHREAD_MUTEX_INITIALIZER
;
51 static uint64_t relayd_net_seq_idx
;
53 static int validate_event_name(const char *);
54 static int validate_ust_event_name(const char *);
55 static int cmd_enable_event_internal(struct ltt_session
*session
,
56 struct lttng_domain
*domain
,
57 char *channel_name
, struct lttng_event
*event
,
58 char *filter_expression
,
59 struct lttng_filter_bytecode
*filter
,
60 struct lttng_event_exclusion
*exclusion
,
64 * Create a session path used by list_lttng_sessions for the case that the
65 * session consumer is on the network.
67 static int build_network_session_path(char *dst
, size_t size
,
68 struct ltt_session
*session
)
70 int ret
, kdata_port
, udata_port
;
71 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
72 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
77 memset(tmp_urls
, 0, sizeof(tmp_urls
));
78 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
80 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
82 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
83 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
84 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
87 if (session
->ust_session
&& session
->ust_session
->consumer
) {
88 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
89 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
92 if (uuri
== NULL
&& kuri
== NULL
) {
93 uri
= &session
->consumer
->dst
.net
.control
;
94 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
95 } else if (kuri
&& uuri
) {
96 ret
= uri_compare(kuri
, uuri
);
100 /* Build uuri URL string */
101 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
108 } else if (kuri
&& uuri
== NULL
) {
110 } else if (uuri
&& kuri
== NULL
) {
114 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
120 * Do we have a UST url set. If yes, this means we have both kernel and UST
123 if (*tmp_uurl
!= '\0') {
124 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
125 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
128 if (kuri
|| (!kuri
&& !uuri
)) {
131 /* No kernel URI, use the UST port. */
134 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, dport
);
142 * Fill lttng_channel array of all channels.
144 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
145 struct lttng_channel
*channels
)
148 struct ltt_kernel_channel
*kchan
;
150 DBG("Listing channels for session %s", session
->name
);
153 case LTTNG_DOMAIN_KERNEL
:
154 /* Kernel channels */
155 if (session
->kernel_session
!= NULL
) {
156 cds_list_for_each_entry(kchan
,
157 &session
->kernel_session
->channel_list
.head
, list
) {
158 /* Copy lttng_channel struct to array */
159 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
160 channels
[i
].enabled
= kchan
->enabled
;
165 case LTTNG_DOMAIN_UST
:
167 struct lttng_ht_iter iter
;
168 struct ltt_ust_channel
*uchan
;
171 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
172 &iter
.iter
, uchan
, node
.node
) {
173 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
174 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
175 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
176 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
177 channels
[i
].attr
.switch_timer_interval
=
178 uchan
->attr
.switch_timer_interval
;
179 channels
[i
].attr
.read_timer_interval
=
180 uchan
->attr
.read_timer_interval
;
181 channels
[i
].enabled
= uchan
->enabled
;
182 channels
[i
].attr
.tracefile_size
= uchan
->tracefile_size
;
183 channels
[i
].attr
.tracefile_count
= uchan
->tracefile_count
;
184 switch (uchan
->attr
.output
) {
187 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
201 * Create a list of agent domain events.
203 * Return number of events in list on success or else a negative value.
205 static int list_lttng_agent_events(struct agent
*agt
,
206 struct lttng_event
**events
)
209 unsigned int nb_event
= 0;
210 struct agent_event
*event
;
211 struct lttng_event
*tmp_events
;
212 struct lttng_ht_iter iter
;
217 DBG3("Listing agent events");
220 nb_event
= lttng_ht_get_count(agt
->events
);
227 tmp_events
= zmalloc(nb_event
* sizeof(*tmp_events
));
229 PERROR("zmalloc agent events session");
230 ret
= -LTTNG_ERR_FATAL
;
235 cds_lfht_for_each_entry(agt
->events
->ht
, &iter
.iter
, event
, node
.node
) {
236 strncpy(tmp_events
[i
].name
, event
->name
, sizeof(tmp_events
[i
].name
));
237 tmp_events
[i
].name
[sizeof(tmp_events
[i
].name
) - 1] = '\0';
238 tmp_events
[i
].enabled
= event
->enabled
;
239 tmp_events
[i
].loglevel
= event
->loglevel
;
240 tmp_events
[i
].loglevel_type
= event
->loglevel_type
;
245 *events
= tmp_events
;
249 assert(nb_event
== i
);
254 * Create a list of ust global domain events.
256 static int list_lttng_ust_global_events(char *channel_name
,
257 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
260 unsigned int nb_event
= 0;
261 struct lttng_ht_iter iter
;
262 struct lttng_ht_node_str
*node
;
263 struct ltt_ust_channel
*uchan
;
264 struct ltt_ust_event
*uevent
;
265 struct lttng_event
*tmp
;
267 DBG("Listing UST global events for channel %s", channel_name
);
271 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
272 node
= lttng_ht_iter_get_node_str(&iter
);
274 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
278 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
280 nb_event
= lttng_ht_get_count(uchan
->events
);
286 DBG3("Listing UST global %d events", nb_event
);
288 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
290 ret
= LTTNG_ERR_FATAL
;
294 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
295 if (uevent
->internal
) {
296 /* This event should remain hidden from clients */
300 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
301 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
302 tmp
[i
].enabled
= uevent
->enabled
;
304 switch (uevent
->attr
.instrumentation
) {
305 case LTTNG_UST_TRACEPOINT
:
306 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
308 case LTTNG_UST_PROBE
:
309 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
311 case LTTNG_UST_FUNCTION
:
312 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
316 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
317 switch (uevent
->attr
.loglevel_type
) {
318 case LTTNG_UST_LOGLEVEL_ALL
:
319 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
321 case LTTNG_UST_LOGLEVEL_RANGE
:
322 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
324 case LTTNG_UST_LOGLEVEL_SINGLE
:
325 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
328 if (uevent
->filter
) {
331 if (uevent
->exclusion
) {
332 tmp
[i
].exclusion
= 1;
346 * Fill lttng_event array of all kernel events in the channel.
348 static int list_lttng_kernel_events(char *channel_name
,
349 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
352 unsigned int nb_event
;
353 struct ltt_kernel_event
*event
;
354 struct ltt_kernel_channel
*kchan
;
356 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
358 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
362 nb_event
= kchan
->event_count
;
364 DBG("Listing events for channel %s", kchan
->channel
->name
);
371 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
372 if (*events
== NULL
) {
373 ret
= LTTNG_ERR_FATAL
;
377 /* Kernel channels */
378 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
379 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
380 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
381 (*events
)[i
].enabled
= event
->enabled
;
383 switch (event
->event
->instrumentation
) {
384 case LTTNG_KERNEL_TRACEPOINT
:
385 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
387 case LTTNG_KERNEL_KRETPROBE
:
388 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
389 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
390 sizeof(struct lttng_kernel_kprobe
));
392 case LTTNG_KERNEL_KPROBE
:
393 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
394 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
395 sizeof(struct lttng_kernel_kprobe
));
397 case LTTNG_KERNEL_FUNCTION
:
398 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
399 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
400 sizeof(struct lttng_kernel_function
));
402 case LTTNG_KERNEL_NOOP
:
403 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
405 case LTTNG_KERNEL_SYSCALL
:
406 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
408 case LTTNG_KERNEL_ALL
:
419 new_size
= syscall_list_channel(kchan
, events
, nb_event
);
431 /* Negate the error code to differentiate the size from an error */
436 * Add URI so the consumer output object. Set the correct path depending on the
437 * domain adding the default trace directory.
439 static int add_uri_to_consumer(struct consumer_output
*consumer
,
440 struct lttng_uri
*uri
, int domain
, const char *session_name
)
443 const char *default_trace_dir
;
447 if (consumer
== NULL
) {
448 DBG("No consumer detected. Don't add URI. Stopping.");
449 ret
= LTTNG_ERR_NO_CONSUMER
;
454 case LTTNG_DOMAIN_KERNEL
:
455 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
457 case LTTNG_DOMAIN_UST
:
458 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
462 * This case is possible is we try to add the URI to the global tracing
463 * session consumer object which in this case there is no subdir.
465 default_trace_dir
= "";
468 switch (uri
->dtype
) {
471 DBG2("Setting network URI to consumer");
473 if (consumer
->type
== CONSUMER_DST_NET
) {
474 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
475 consumer
->dst
.net
.control_isset
) ||
476 (uri
->stype
== LTTNG_STREAM_DATA
&&
477 consumer
->dst
.net
.data_isset
)) {
478 ret
= LTTNG_ERR_URL_EXIST
;
482 memset(&consumer
->dst
.net
, 0, sizeof(consumer
->dst
.net
));
485 consumer
->type
= CONSUMER_DST_NET
;
487 /* Set URI into consumer output object */
488 ret
= consumer_set_network_uri(consumer
, uri
);
492 } else if (ret
== 1) {
494 * URI was the same in the consumer so we do not append the subdir
495 * again so to not duplicate output dir.
501 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
502 ret
= consumer_set_subdir(consumer
, session_name
);
504 ret
= LTTNG_ERR_FATAL
;
509 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
510 /* On a new subdir, reappend the default trace dir. */
511 strncat(consumer
->subdir
, default_trace_dir
,
512 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
513 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
518 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
519 memset(consumer
->dst
.trace_path
, 0,
520 sizeof(consumer
->dst
.trace_path
));
521 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
522 sizeof(consumer
->dst
.trace_path
));
523 /* Append default trace dir */
524 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
525 sizeof(consumer
->dst
.trace_path
) -
526 strlen(consumer
->dst
.trace_path
) - 1);
527 /* Flag consumer as local. */
528 consumer
->type
= CONSUMER_DST_LOCAL
;
539 * Init tracing by creating trace directory and sending fds kernel consumer.
541 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
544 struct lttng_ht_iter iter
;
545 struct consumer_socket
*socket
;
551 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
552 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
554 pthread_mutex_lock(socket
->lock
);
555 ret
= kernel_consumer_send_session(socket
, session
);
556 pthread_mutex_unlock(socket
->lock
);
558 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
570 * Create a socket to the relayd using the URI.
572 * On success, the relayd_sock pointer is set to the created socket.
573 * Else, it's stays untouched and a lttcomm error code is returned.
575 static int create_connect_relayd(struct lttng_uri
*uri
,
576 struct lttcomm_relayd_sock
**relayd_sock
)
579 struct lttcomm_relayd_sock
*rsock
;
581 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
582 RELAYD_VERSION_COMM_MINOR
);
584 ret
= LTTNG_ERR_FATAL
;
589 * Connect to relayd so we can proceed with a session creation. This call
590 * can possibly block for an arbitrary amount of time to set the health
591 * state to be in poll execution.
594 ret
= relayd_connect(rsock
);
597 ERR("Unable to reach lttng-relayd");
598 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
602 /* Create socket for control stream. */
603 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
604 DBG3("Creating relayd stream socket from URI");
606 /* Check relayd version */
607 ret
= relayd_version_check(rsock
);
609 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
612 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
613 DBG3("Creating relayd data socket from URI");
615 /* Command is not valid */
616 ERR("Relayd invalid stream type: %d", uri
->stype
);
617 ret
= LTTNG_ERR_INVALID
;
621 *relayd_sock
= rsock
;
626 /* The returned value is not useful since we are on an error path. */
627 (void) relayd_close(rsock
);
635 * Connect to the relayd using URI and send the socket to the right consumer.
637 static int send_consumer_relayd_socket(int domain
, unsigned int session_id
,
638 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
639 struct consumer_socket
*consumer_sock
,
640 char *session_name
, char *hostname
, int session_live_timer
)
643 struct lttcomm_relayd_sock
*rsock
= NULL
;
645 /* Connect to relayd and make version check if uri is the control. */
646 ret
= create_connect_relayd(relayd_uri
, &rsock
);
647 if (ret
!= LTTNG_OK
) {
652 /* Set the network sequence index if not set. */
653 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
654 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
656 * Increment net_seq_idx because we are about to transfer the
657 * new relayd socket to the consumer.
658 * Assign unique key so the consumer can match streams.
660 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
661 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
664 /* Send relayd socket to consumer. */
665 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
666 relayd_uri
->stype
, session_id
,
667 session_name
, hostname
, session_live_timer
);
669 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
673 /* Flag that the corresponding socket was sent. */
674 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
675 consumer_sock
->control_sock_sent
= 1;
676 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
677 consumer_sock
->data_sock_sent
= 1;
683 * Close socket which was dup on the consumer side. The session daemon does
684 * NOT keep track of the relayd socket(s) once transfer to the consumer.
688 (void) relayd_close(rsock
);
692 if (ret
!= LTTNG_OK
) {
694 * The consumer output for this session should not be used anymore
695 * since the relayd connection failed thus making any tracing or/and
696 * streaming not usable.
698 consumer
->enabled
= 0;
704 * Send both relayd sockets to a specific consumer and domain. This is a
705 * helper function to facilitate sending the information to the consumer for a
708 static int send_consumer_relayd_sockets(int domain
, unsigned int session_id
,
709 struct consumer_output
*consumer
, struct consumer_socket
*sock
,
710 char *session_name
, char *hostname
, int session_live_timer
)
717 /* Sending control relayd socket. */
718 if (!sock
->control_sock_sent
) {
719 ret
= send_consumer_relayd_socket(domain
, session_id
,
720 &consumer
->dst
.net
.control
, consumer
, sock
,
721 session_name
, hostname
, session_live_timer
);
722 if (ret
!= LTTNG_OK
) {
727 /* Sending data relayd socket. */
728 if (!sock
->data_sock_sent
) {
729 ret
= send_consumer_relayd_socket(domain
, session_id
,
730 &consumer
->dst
.net
.data
, consumer
, sock
,
731 session_name
, hostname
, session_live_timer
);
732 if (ret
!= LTTNG_OK
) {
742 * Setup relayd connections for a tracing session. First creates the socket to
743 * the relayd and send them to the right domain consumer. Consumer type MUST be
746 int cmd_setup_relayd(struct ltt_session
*session
)
749 struct ltt_ust_session
*usess
;
750 struct ltt_kernel_session
*ksess
;
751 struct consumer_socket
*socket
;
752 struct lttng_ht_iter iter
;
756 usess
= session
->ust_session
;
757 ksess
= session
->kernel_session
;
759 DBG("Setting relayd for session %s", session
->name
);
763 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
764 && usess
->consumer
->enabled
) {
765 /* For each consumer socket, send relayd sockets */
766 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
768 pthread_mutex_lock(socket
->lock
);
769 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
->id
,
770 usess
->consumer
, socket
,
771 session
->name
, session
->hostname
,
772 session
->live_timer
);
773 pthread_mutex_unlock(socket
->lock
);
774 if (ret
!= LTTNG_OK
) {
777 /* Session is now ready for network streaming. */
778 session
->net_handle
= 1;
782 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
783 && ksess
->consumer
->enabled
) {
784 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
786 pthread_mutex_lock(socket
->lock
);
787 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
->id
,
788 ksess
->consumer
, socket
,
789 session
->name
, session
->hostname
,
790 session
->live_timer
);
791 pthread_mutex_unlock(socket
->lock
);
792 if (ret
!= LTTNG_OK
) {
795 /* Session is now ready for network streaming. */
796 session
->net_handle
= 1;
806 * Start a kernel session by opening all necessary streams.
808 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
811 struct ltt_kernel_channel
*kchan
;
813 /* Open kernel metadata */
814 if (ksess
->metadata
== NULL
&& ksess
->output_traces
) {
815 ret
= kernel_open_metadata(ksess
);
817 ret
= LTTNG_ERR_KERN_META_FAIL
;
822 /* Open kernel metadata stream */
823 if (ksess
->metadata
&& ksess
->metadata_stream_fd
< 0) {
824 ret
= kernel_open_metadata_stream(ksess
);
826 ERR("Kernel create metadata stream failed");
827 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
832 /* For each channel */
833 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
834 if (kchan
->stream_count
== 0) {
835 ret
= kernel_open_channel_stream(kchan
);
837 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
840 /* Update the stream global counter */
841 ksess
->stream_count_global
+= ret
;
845 /* Setup kernel consumer socket and send fds to it */
846 ret
= init_kernel_tracing(ksess
);
848 ret
= LTTNG_ERR_KERN_START_FAIL
;
852 /* This start the kernel tracing */
853 ret
= kernel_start_session(ksess
);
855 ret
= LTTNG_ERR_KERN_START_FAIL
;
859 /* Quiescent wait after starting trace */
860 kernel_wait_quiescent(kernel_tracer_fd
);
871 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
873 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
877 struct ltt_ust_session
*usess
;
879 usess
= session
->ust_session
;
884 case LTTNG_DOMAIN_KERNEL
:
886 ret
= channel_kernel_disable(session
->kernel_session
,
888 if (ret
!= LTTNG_OK
) {
892 kernel_wait_quiescent(kernel_tracer_fd
);
895 case LTTNG_DOMAIN_UST
:
897 struct ltt_ust_channel
*uchan
;
898 struct lttng_ht
*chan_ht
;
900 chan_ht
= usess
->domain_global
.channels
;
902 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
904 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
908 ret
= channel_ust_disable(usess
, uchan
);
909 if (ret
!= LTTNG_OK
) {
915 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
927 * Command LTTNG_TRACK_PID processed by the client thread.
929 * Called with session lock held.
931 int cmd_track_pid(struct ltt_session
*session
, int domain
, int pid
)
938 case LTTNG_DOMAIN_KERNEL
:
940 struct ltt_kernel_session
*ksess
;
942 ksess
= session
->kernel_session
;
944 ret
= kernel_track_pid(ksess
, pid
);
945 if (ret
!= LTTNG_OK
) {
949 kernel_wait_quiescent(kernel_tracer_fd
);
952 case LTTNG_DOMAIN_UST
:
954 struct ltt_ust_session
*usess
;
956 usess
= session
->ust_session
;
958 ret
= trace_ust_track_pid(usess
, pid
);
959 if (ret
!= LTTNG_OK
) {
965 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
977 * Command LTTNG_UNTRACK_PID processed by the client thread.
979 * Called with session lock held.
981 int cmd_untrack_pid(struct ltt_session
*session
, int domain
, int pid
)
988 case LTTNG_DOMAIN_KERNEL
:
990 struct ltt_kernel_session
*ksess
;
992 ksess
= session
->kernel_session
;
994 ret
= kernel_untrack_pid(ksess
, pid
);
995 if (ret
!= LTTNG_OK
) {
999 kernel_wait_quiescent(kernel_tracer_fd
);
1002 case LTTNG_DOMAIN_UST
:
1004 struct ltt_ust_session
*usess
;
1006 usess
= session
->ust_session
;
1008 ret
= trace_ust_untrack_pid(usess
, pid
);
1009 if (ret
!= LTTNG_OK
) {
1015 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1027 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1029 * The wpipe arguments is used as a notifier for the kernel thread.
1031 int cmd_enable_channel(struct ltt_session
*session
,
1032 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
1035 struct ltt_ust_session
*usess
= session
->ust_session
;
1036 struct lttng_ht
*chan_ht
;
1043 len
= strnlen(attr
->name
, sizeof(attr
->name
));
1045 /* Validate channel name */
1046 if (attr
->name
[0] == '.' ||
1047 memchr(attr
->name
, '/', len
) != NULL
) {
1048 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1052 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
1057 * Don't try to enable a channel if the session has been started at
1058 * some point in time before. The tracer does not allow it.
1060 if (session
->has_been_started
) {
1061 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1066 * If the session is a live session, remove the switch timer, the
1067 * live timer does the same thing but sends also synchronisation
1068 * beacons for inactive streams.
1070 if (session
->live_timer
> 0) {
1071 attr
->attr
.live_timer_interval
= session
->live_timer
;
1072 attr
->attr
.switch_timer_interval
= 0;
1076 * The ringbuffer (both in user space and kernel) behave badly in overwrite
1077 * mode and with less than 2 subbuf so block it right away and send back an
1078 * invalid attribute error.
1080 if (attr
->attr
.overwrite
&& attr
->attr
.num_subbuf
< 2) {
1081 ret
= LTTNG_ERR_INVALID
;
1085 switch (domain
->type
) {
1086 case LTTNG_DOMAIN_KERNEL
:
1088 struct ltt_kernel_channel
*kchan
;
1090 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
1091 session
->kernel_session
);
1092 if (kchan
== NULL
) {
1093 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
1094 if (attr
->name
[0] != '\0') {
1095 session
->kernel_session
->has_non_default_channel
= 1;
1098 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
1101 if (ret
!= LTTNG_OK
) {
1105 kernel_wait_quiescent(kernel_tracer_fd
);
1108 case LTTNG_DOMAIN_UST
:
1110 struct ltt_ust_channel
*uchan
;
1112 chan_ht
= usess
->domain_global
.channels
;
1114 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
1115 if (uchan
== NULL
) {
1116 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
1117 if (attr
->name
[0] != '\0') {
1118 usess
->has_non_default_channel
= 1;
1121 ret
= channel_ust_enable(usess
, uchan
);
1126 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1137 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1139 int cmd_disable_event(struct ltt_session
*session
, int domain
,
1141 struct lttng_event
*event
)
1146 DBG("Disable event command for event \'%s\'", event
->name
);
1148 event_name
= event
->name
;
1149 if (validate_event_name(event_name
)) {
1150 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1154 /* Error out on unhandled search criteria */
1155 if (event
->loglevel_type
|| event
->loglevel
!= -1 || event
->enabled
1156 || event
->pid
|| event
->filter
|| event
->exclusion
) {
1157 ret
= LTTNG_ERR_UNK
;
1164 case LTTNG_DOMAIN_KERNEL
:
1166 struct ltt_kernel_channel
*kchan
;
1167 struct ltt_kernel_session
*ksess
;
1169 ksess
= session
->kernel_session
;
1172 * If a non-default channel has been created in the
1173 * session, explicitely require that -c chan_name needs
1176 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1177 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1181 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1182 if (kchan
== NULL
) {
1183 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1187 switch (event
->type
) {
1188 case LTTNG_EVENT_ALL
:
1189 ret
= event_kernel_disable_event_all(kchan
);
1190 if (ret
!= LTTNG_OK
) {
1194 case LTTNG_EVENT_TRACEPOINT
: /* fall-through */
1195 case LTTNG_EVENT_SYSCALL
:
1196 if (!strcmp(event_name
, "*")) {
1197 ret
= event_kernel_disable_event_type(kchan
,
1200 ret
= event_kernel_disable_event(kchan
,
1203 if (ret
!= LTTNG_OK
) {
1207 case LTTNG_EVENT_PROBE
:
1208 case LTTNG_EVENT_FUNCTION
:
1209 case LTTNG_EVENT_FUNCTION_ENTRY
:
1210 ret
= event_kernel_disable_event(kchan
, event_name
);
1211 if (ret
!= LTTNG_OK
) {
1216 ret
= LTTNG_ERR_UNK
;
1220 kernel_wait_quiescent(kernel_tracer_fd
);
1223 case LTTNG_DOMAIN_UST
:
1225 struct ltt_ust_channel
*uchan
;
1226 struct ltt_ust_session
*usess
;
1228 usess
= session
->ust_session
;
1230 if (validate_ust_event_name(event_name
)) {
1231 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1236 * If a non-default channel has been created in the
1237 * session, explicitely require that -c chan_name needs
1240 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1241 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1245 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1247 if (uchan
== NULL
) {
1248 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1252 switch (event
->type
) {
1253 case LTTNG_EVENT_ALL
:
1254 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
1255 if (ret
!= LTTNG_OK
) {
1260 ret
= LTTNG_ERR_UNK
;
1264 DBG3("Disable UST event %s in channel %s completed", event_name
,
1268 case LTTNG_DOMAIN_LOG4J
:
1269 case LTTNG_DOMAIN_JUL
:
1270 case LTTNG_DOMAIN_PYTHON
:
1273 struct ltt_ust_session
*usess
= session
->ust_session
;
1277 switch (event
->type
) {
1278 case LTTNG_EVENT_ALL
:
1281 ret
= LTTNG_ERR_UNK
;
1285 agt
= trace_ust_find_agent(usess
, domain
);
1287 ret
= -LTTNG_ERR_UST_EVENT_NOT_FOUND
;
1290 /* The wild card * means that everything should be disabled. */
1291 if (strncmp(event
->name
, "*", 1) == 0 && strlen(event
->name
) == 1) {
1292 ret
= event_agent_disable_all(usess
, agt
);
1294 ret
= event_agent_disable(usess
, agt
, event_name
);
1296 if (ret
!= LTTNG_OK
) {
1303 ret
= LTTNG_ERR_UND
;
1316 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1318 int cmd_add_context(struct ltt_session
*session
, int domain
,
1319 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1321 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1324 case LTTNG_DOMAIN_KERNEL
:
1325 assert(session
->kernel_session
);
1327 if (session
->kernel_session
->channel_count
== 0) {
1328 /* Create default channel */
1329 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1330 if (ret
!= LTTNG_OK
) {
1333 chan_kern_created
= 1;
1335 /* Add kernel context to kernel tracer */
1336 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1337 if (ret
!= LTTNG_OK
) {
1341 case LTTNG_DOMAIN_UST
:
1343 struct ltt_ust_session
*usess
= session
->ust_session
;
1344 unsigned int chan_count
;
1348 chan_count
= lttng_ht_get_count(usess
->domain_global
.channels
);
1349 if (chan_count
== 0) {
1350 struct lttng_channel
*attr
;
1351 /* Create default channel */
1352 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1354 ret
= LTTNG_ERR_FATAL
;
1358 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1359 if (ret
!= LTTNG_OK
) {
1364 chan_ust_created
= 1;
1367 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1368 if (ret
!= LTTNG_OK
) {
1374 ret
= LTTNG_ERR_UND
;
1381 if (chan_kern_created
) {
1382 struct ltt_kernel_channel
*kchan
=
1383 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1384 session
->kernel_session
);
1385 /* Created previously, this should NOT fail. */
1387 kernel_destroy_channel(kchan
);
1390 if (chan_ust_created
) {
1391 struct ltt_ust_channel
*uchan
=
1392 trace_ust_find_channel_by_name(
1393 session
->ust_session
->domain_global
.channels
,
1394 DEFAULT_CHANNEL_NAME
);
1395 /* Created previously, this should NOT fail. */
1397 /* Remove from the channel list of the session. */
1398 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1400 trace_ust_destroy_channel(uchan
);
1405 static int validate_event_name(const char *name
)
1408 const char *c
= name
;
1409 const char *event_name_end
= c
+ LTTNG_SYMBOL_NAME_LEN
;
1412 * Make sure that unescaped wildcards are only used as the last
1413 * character of the event name.
1415 while (c
< event_name_end
) {
1423 if ((c
+ 1) < event_name_end
&& *(c
+ 1)) {
1424 /* Wildcard is not the last character */
1425 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1437 static inline bool name_starts_with(const char *name
, const char *prefix
)
1439 const size_t max_cmp_len
= min(strlen(prefix
), LTTNG_SYMBOL_NAME_LEN
);
1441 return !strncmp(name
, prefix
, max_cmp_len
);
1444 /* Perform userspace-specific event name validation */
1445 static int validate_ust_event_name(const char *name
)
1455 * Check name against all internal UST event component namespaces used
1458 if (name_starts_with(name
, DEFAULT_JUL_EVENT_COMPONENT
) ||
1459 name_starts_with(name
, DEFAULT_LOG4J_EVENT_COMPONENT
) ||
1460 name_starts_with(name
, DEFAULT_PYTHON_EVENT_COMPONENT
)) {
1469 * Internal version of cmd_enable_event() with a supplemental
1470 * "internal_event" flag which is used to enable internal events which should
1471 * be hidden from clients. Such events are used in the agent implementation to
1472 * enable the events through which all "agent" events are funeled.
1474 static int _cmd_enable_event(struct ltt_session
*session
,
1475 struct lttng_domain
*domain
,
1476 char *channel_name
, struct lttng_event
*event
,
1477 char *filter_expression
,
1478 struct lttng_filter_bytecode
*filter
,
1479 struct lttng_event_exclusion
*exclusion
,
1480 int wpipe
, bool internal_event
)
1482 int ret
, channel_created
= 0;
1483 struct lttng_channel
*attr
;
1487 assert(channel_name
);
1489 DBG("Enable event command for event \'%s\'", event
->name
);
1491 ret
= validate_event_name(event
->name
);
1498 switch (domain
->type
) {
1499 case LTTNG_DOMAIN_KERNEL
:
1501 struct ltt_kernel_channel
*kchan
;
1504 * If a non-default channel has been created in the
1505 * session, explicitely require that -c chan_name needs
1508 if (session
->kernel_session
->has_non_default_channel
1509 && channel_name
[0] == '\0') {
1510 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1514 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1515 session
->kernel_session
);
1516 if (kchan
== NULL
) {
1517 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1518 LTTNG_BUFFER_GLOBAL
);
1520 ret
= LTTNG_ERR_FATAL
;
1523 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1525 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1526 if (ret
!= LTTNG_OK
) {
1532 channel_created
= 1;
1535 /* Get the newly created kernel channel pointer */
1536 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1537 session
->kernel_session
);
1538 if (kchan
== NULL
) {
1539 /* This sould not happen... */
1540 ret
= LTTNG_ERR_FATAL
;
1544 switch (event
->type
) {
1545 case LTTNG_EVENT_ALL
:
1547 char *filter_expression_a
= NULL
;
1548 struct lttng_filter_bytecode
*filter_a
= NULL
;
1551 * We need to duplicate filter_expression and filter,
1552 * because ownership is passed to first enable
1555 if (filter_expression
) {
1556 filter_expression_a
= strdup(filter_expression
);
1557 if (!filter_expression_a
) {
1558 ret
= LTTNG_ERR_FATAL
;
1563 filter_a
= zmalloc(sizeof(*filter_a
) + filter
->len
);
1565 free(filter_expression_a
);
1566 ret
= LTTNG_ERR_FATAL
;
1569 memcpy(filter_a
, filter
, sizeof(*filter_a
) + filter
->len
);
1571 event
->type
= LTTNG_EVENT_TRACEPOINT
; /* Hack */
1572 ret
= event_kernel_enable_event(kchan
, event
,
1573 filter_expression
, filter
);
1574 /* We have passed ownership */
1575 filter_expression
= NULL
;
1577 if (ret
!= LTTNG_OK
) {
1578 if (channel_created
) {
1579 /* Let's not leak a useless channel. */
1580 kernel_destroy_channel(kchan
);
1582 free(filter_expression_a
);
1586 event
->type
= LTTNG_EVENT_SYSCALL
; /* Hack */
1587 ret
= event_kernel_enable_event(kchan
, event
,
1588 filter_expression_a
, filter_a
);
1589 if (ret
!= LTTNG_OK
) {
1590 free(filter_expression_a
);
1596 case LTTNG_EVENT_PROBE
:
1597 case LTTNG_EVENT_FUNCTION
:
1598 case LTTNG_EVENT_FUNCTION_ENTRY
:
1599 case LTTNG_EVENT_TRACEPOINT
:
1600 ret
= event_kernel_enable_event(kchan
, event
,
1601 filter_expression
, filter
);
1602 /* We have passed ownership */
1603 filter_expression
= NULL
;
1605 if (ret
!= LTTNG_OK
) {
1606 if (channel_created
) {
1607 /* Let's not leak a useless channel. */
1608 kernel_destroy_channel(kchan
);
1613 case LTTNG_EVENT_SYSCALL
:
1614 ret
= event_kernel_enable_event(kchan
, event
,
1615 filter_expression
, filter
);
1616 /* We have passed ownership */
1617 filter_expression
= NULL
;
1619 if (ret
!= LTTNG_OK
) {
1624 ret
= LTTNG_ERR_UNK
;
1628 kernel_wait_quiescent(kernel_tracer_fd
);
1631 case LTTNG_DOMAIN_UST
:
1633 struct ltt_ust_channel
*uchan
;
1634 struct ltt_ust_session
*usess
= session
->ust_session
;
1639 * If a non-default channel has been created in the
1640 * session, explicitely require that -c chan_name needs
1643 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1644 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1648 /* Get channel from global UST domain */
1649 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1651 if (uchan
== NULL
) {
1652 /* Create default channel */
1653 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1654 usess
->buffer_type
);
1656 ret
= LTTNG_ERR_FATAL
;
1659 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1661 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1662 if (ret
!= LTTNG_OK
) {
1668 /* Get the newly created channel reference back */
1669 uchan
= trace_ust_find_channel_by_name(
1670 usess
->domain_global
.channels
, channel_name
);
1674 if (!internal_event
) {
1676 * Ensure the event name is not reserved for internal
1679 ret
= validate_ust_event_name(event
->name
);
1681 WARN("Userspace event name %s failed validation.",
1683 event
->name
: "NULL");
1684 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1689 /* At this point, the session and channel exist on the tracer */
1690 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
,
1691 filter_expression
, filter
, exclusion
,
1693 /* We have passed ownership */
1694 filter_expression
= NULL
;
1697 if (ret
!= LTTNG_OK
) {
1702 case LTTNG_DOMAIN_LOG4J
:
1703 case LTTNG_DOMAIN_JUL
:
1704 case LTTNG_DOMAIN_PYTHON
:
1706 const char *default_event_name
, *default_chan_name
;
1708 struct lttng_event uevent
;
1709 struct lttng_domain tmp_dom
;
1710 struct ltt_ust_session
*usess
= session
->ust_session
;
1714 agt
= trace_ust_find_agent(usess
, domain
->type
);
1716 agt
= agent_create(domain
->type
);
1718 ret
= -LTTNG_ERR_NOMEM
;
1721 agent_add(agt
, usess
->agents
);
1724 /* Create the default tracepoint. */
1725 memset(&uevent
, 0, sizeof(uevent
));
1726 uevent
.type
= LTTNG_EVENT_TRACEPOINT
;
1727 uevent
.loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
1728 default_event_name
= event_get_default_agent_ust_name(domain
->type
);
1729 if (!default_event_name
) {
1730 ret
= -LTTNG_ERR_FATAL
;
1733 strncpy(uevent
.name
, default_event_name
, sizeof(uevent
.name
));
1734 uevent
.name
[sizeof(uevent
.name
) - 1] = '\0';
1737 * The domain type is changed because we are about to enable the
1738 * default channel and event for the JUL domain that are hardcoded.
1739 * This happens in the UST domain.
1741 memcpy(&tmp_dom
, domain
, sizeof(tmp_dom
));
1742 tmp_dom
.type
= LTTNG_DOMAIN_UST
;
1744 switch (domain
->type
) {
1745 case LTTNG_DOMAIN_LOG4J
:
1746 default_chan_name
= DEFAULT_LOG4J_CHANNEL_NAME
;
1748 case LTTNG_DOMAIN_JUL
:
1749 default_chan_name
= DEFAULT_JUL_CHANNEL_NAME
;
1751 case LTTNG_DOMAIN_PYTHON
:
1752 default_chan_name
= DEFAULT_PYTHON_CHANNEL_NAME
;
1755 /* The switch/case we are in should avoid this else big problem */
1760 struct lttng_filter_bytecode
*filter_copy
= NULL
;
1763 filter_copy
= zmalloc(
1764 sizeof(struct lttng_filter_bytecode
)
1770 memcpy(filter_copy
, filter
,
1771 sizeof(struct lttng_filter_bytecode
)
1775 ret
= cmd_enable_event_internal(session
, &tmp_dom
,
1776 (char *) default_chan_name
,
1777 &uevent
, filter_expression
, filter_copy
,
1779 /* We have passed ownership */
1780 filter_expression
= NULL
;
1783 if (ret
!= LTTNG_OK
&& ret
!= LTTNG_ERR_UST_EVENT_ENABLED
) {
1787 /* The wild card * means that everything should be enabled. */
1788 if (strncmp(event
->name
, "*", 1) == 0 && strlen(event
->name
) == 1) {
1789 ret
= event_agent_enable_all(usess
, agt
, event
, filter
);
1792 ret
= event_agent_enable(usess
, agt
, event
, filter
);
1795 if (ret
!= LTTNG_OK
) {
1802 ret
= LTTNG_ERR_UND
;
1809 free(filter_expression
);
1817 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1818 * We own filter, exclusion, and filter_expression.
1820 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1821 char *channel_name
, struct lttng_event
*event
,
1822 char *filter_expression
,
1823 struct lttng_filter_bytecode
*filter
,
1824 struct lttng_event_exclusion
*exclusion
,
1827 return _cmd_enable_event(session
, domain
, channel_name
, event
,
1828 filter_expression
, filter
, exclusion
, wpipe
, false);
1832 * Enable an event which is internal to LTTng. An internal should
1833 * never be made visible to clients and are immune to checks such as
1836 static int cmd_enable_event_internal(struct ltt_session
*session
,
1837 struct lttng_domain
*domain
,
1838 char *channel_name
, struct lttng_event
*event
,
1839 char *filter_expression
,
1840 struct lttng_filter_bytecode
*filter
,
1841 struct lttng_event_exclusion
*exclusion
,
1844 return _cmd_enable_event(session
, domain
, channel_name
, event
,
1845 filter_expression
, filter
, exclusion
, wpipe
, true);
1849 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1851 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1854 ssize_t nb_events
= 0;
1857 case LTTNG_DOMAIN_KERNEL
:
1858 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1859 if (nb_events
< 0) {
1860 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1864 case LTTNG_DOMAIN_UST
:
1865 nb_events
= ust_app_list_events(events
);
1866 if (nb_events
< 0) {
1867 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1871 case LTTNG_DOMAIN_LOG4J
:
1872 case LTTNG_DOMAIN_JUL
:
1873 case LTTNG_DOMAIN_PYTHON
:
1874 nb_events
= agent_list_events(events
, domain
);
1875 if (nb_events
< 0) {
1876 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1881 ret
= LTTNG_ERR_UND
;
1888 /* Return negative value to differentiate return code */
1893 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1895 ssize_t
cmd_list_tracepoint_fields(int domain
,
1896 struct lttng_event_field
**fields
)
1899 ssize_t nb_fields
= 0;
1902 case LTTNG_DOMAIN_UST
:
1903 nb_fields
= ust_app_list_event_fields(fields
);
1904 if (nb_fields
< 0) {
1905 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1909 case LTTNG_DOMAIN_KERNEL
:
1910 default: /* fall-through */
1911 ret
= LTTNG_ERR_UND
;
1918 /* Return negative value to differentiate return code */
1922 ssize_t
cmd_list_syscalls(struct lttng_event
**events
)
1924 return syscall_table_list(events
);
1928 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
1930 * Called with session lock held.
1932 ssize_t
cmd_list_tracker_pids(struct ltt_session
*session
,
1933 int domain
, int32_t **pids
)
1936 ssize_t nr_pids
= 0;
1939 case LTTNG_DOMAIN_KERNEL
:
1941 struct ltt_kernel_session
*ksess
;
1943 ksess
= session
->kernel_session
;
1944 nr_pids
= kernel_list_tracker_pids(ksess
, pids
);
1946 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1951 case LTTNG_DOMAIN_UST
:
1953 struct ltt_ust_session
*usess
;
1955 usess
= session
->ust_session
;
1956 nr_pids
= trace_ust_list_tracker_pids(usess
, pids
);
1958 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1963 case LTTNG_DOMAIN_LOG4J
:
1964 case LTTNG_DOMAIN_JUL
:
1965 case LTTNG_DOMAIN_PYTHON
:
1967 ret
= LTTNG_ERR_UND
;
1974 /* Return negative value to differentiate return code */
1979 * Command LTTNG_START_TRACE processed by the client thread.
1981 * Called with session mutex held.
1983 int cmd_start_trace(struct ltt_session
*session
)
1986 unsigned long nb_chan
= 0;
1987 struct ltt_kernel_session
*ksession
;
1988 struct ltt_ust_session
*usess
;
1992 /* Ease our life a bit ;) */
1993 ksession
= session
->kernel_session
;
1994 usess
= session
->ust_session
;
1996 /* Is the session already started? */
1997 if (session
->active
) {
1998 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2003 * Starting a session without channel is useless since after that it's not
2004 * possible to enable channel thus inform the client.
2006 if (usess
&& usess
->domain_global
.channels
) {
2008 nb_chan
+= lttng_ht_get_count(usess
->domain_global
.channels
);
2012 nb_chan
+= ksession
->channel_count
;
2015 ret
= LTTNG_ERR_NO_CHANNEL
;
2019 /* Kernel tracing */
2020 if (ksession
!= NULL
) {
2021 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
2022 if (ret
!= LTTNG_OK
) {
2027 /* Flag session that trace should start automatically */
2030 * Even though the start trace might fail, flag this session active so
2031 * other application coming in are started by default.
2035 ret
= ust_app_start_trace_all(usess
);
2037 ret
= LTTNG_ERR_UST_START_FAIL
;
2042 /* Flag this after a successful start. */
2043 session
->has_been_started
= 1;
2044 session
->active
= 1;
2053 * Command LTTNG_STOP_TRACE processed by the client thread.
2055 int cmd_stop_trace(struct ltt_session
*session
)
2058 struct ltt_kernel_channel
*kchan
;
2059 struct ltt_kernel_session
*ksession
;
2060 struct ltt_ust_session
*usess
;
2065 ksession
= session
->kernel_session
;
2066 usess
= session
->ust_session
;
2068 /* Session is not active. Skip everythong and inform the client. */
2069 if (!session
->active
) {
2070 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
2075 if (ksession
&& ksession
->active
) {
2076 DBG("Stop kernel tracing");
2078 /* Flush metadata if exist */
2079 if (ksession
->metadata_stream_fd
>= 0) {
2080 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2082 ERR("Kernel metadata flush failed");
2086 /* Flush all buffers before stopping */
2087 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2088 ret
= kernel_flush_buffer(kchan
);
2090 ERR("Kernel flush buffer error");
2094 ret
= kernel_stop_session(ksession
);
2096 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
2100 kernel_wait_quiescent(kernel_tracer_fd
);
2102 ksession
->active
= 0;
2105 if (usess
&& usess
->active
) {
2107 * Even though the stop trace might fail, flag this session inactive so
2108 * other application coming in are not started by default.
2112 ret
= ust_app_stop_trace_all(usess
);
2114 ret
= LTTNG_ERR_UST_STOP_FAIL
;
2119 /* Flag inactive after a successful stop. */
2120 session
->active
= 0;
2128 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2130 int cmd_set_consumer_uri(struct ltt_session
*session
, size_t nb_uri
,
2131 struct lttng_uri
*uris
)
2134 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2135 struct ltt_ust_session
*usess
= session
->ust_session
;
2141 /* Can't set consumer URI if the session is active. */
2142 if (session
->active
) {
2143 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2147 /* Set the "global" consumer URIs */
2148 for (i
= 0; i
< nb_uri
; i
++) {
2149 ret
= add_uri_to_consumer(session
->consumer
,
2150 &uris
[i
], 0, session
->name
);
2151 if (ret
!= LTTNG_OK
) {
2156 /* Set UST session URIs */
2157 if (session
->ust_session
) {
2158 for (i
= 0; i
< nb_uri
; i
++) {
2159 ret
= add_uri_to_consumer(
2160 session
->ust_session
->consumer
,
2161 &uris
[i
], LTTNG_DOMAIN_UST
,
2163 if (ret
!= LTTNG_OK
) {
2169 /* Set kernel session URIs */
2170 if (session
->kernel_session
) {
2171 for (i
= 0; i
< nb_uri
; i
++) {
2172 ret
= add_uri_to_consumer(
2173 session
->kernel_session
->consumer
,
2174 &uris
[i
], LTTNG_DOMAIN_KERNEL
,
2176 if (ret
!= LTTNG_OK
) {
2183 * Make sure to set the session in output mode after we set URI since a
2184 * session can be created without URL (thus flagged in no output mode).
2186 session
->output_traces
= 1;
2188 ksess
->output_traces
= 1;
2192 usess
->output_traces
= 1;
2203 * Command LTTNG_CREATE_SESSION processed by the client thread.
2205 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
2206 size_t nb_uri
, lttng_sock_cred
*creds
, unsigned int live_timer
)
2209 struct ltt_session
*session
;
2215 * Verify if the session already exist
2217 * XXX: There is no need for the session lock list here since the caller
2218 * (process_client_msg) is holding it. We might want to change that so a
2219 * single command does not lock the entire session list.
2221 session
= session_find_by_name(name
);
2222 if (session
!= NULL
) {
2223 ret
= LTTNG_ERR_EXIST_SESS
;
2227 /* Create tracing session in the registry */
2228 ret
= session_create(name
, LTTNG_SOCK_GET_UID_CRED(creds
),
2229 LTTNG_SOCK_GET_GID_CRED(creds
));
2230 if (ret
!= LTTNG_OK
) {
2235 * Get the newly created session pointer back
2237 * XXX: There is no need for the session lock list here since the caller
2238 * (process_client_msg) is holding it. We might want to change that so a
2239 * single command does not lock the entire session list.
2241 session
= session_find_by_name(name
);
2244 session
->live_timer
= live_timer
;
2245 /* Create default consumer output for the session not yet created. */
2246 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
2247 if (session
->consumer
== NULL
) {
2248 ret
= LTTNG_ERR_FATAL
;
2249 goto consumer_error
;
2253 ret
= cmd_set_consumer_uri(session
, nb_uri
, uris
);
2254 if (ret
!= LTTNG_OK
) {
2255 goto consumer_error
;
2257 session
->output_traces
= 1;
2259 session
->output_traces
= 0;
2260 DBG2("Session %s created with no output", session
->name
);
2263 session
->consumer
->enabled
= 1;
2268 session_destroy(session
);
2275 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2277 int cmd_create_session_snapshot(char *name
, struct lttng_uri
*uris
,
2278 size_t nb_uri
, lttng_sock_cred
*creds
)
2281 struct ltt_session
*session
;
2282 struct snapshot_output
*new_output
= NULL
;
2288 * Create session in no output mode with URIs set to NULL. The uris we've
2289 * received are for a default snapshot output if one.
2291 ret
= cmd_create_session_uri(name
, NULL
, 0, creds
, -1);
2292 if (ret
!= LTTNG_OK
) {
2296 /* Get the newly created session pointer back. This should NEVER fail. */
2297 session
= session_find_by_name(name
);
2300 /* Flag session for snapshot mode. */
2301 session
->snapshot_mode
= 1;
2303 /* Skip snapshot output creation if no URI is given. */
2308 new_output
= snapshot_output_alloc();
2310 ret
= LTTNG_ERR_NOMEM
;
2311 goto error_snapshot_alloc
;
2314 ret
= snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE
, NULL
,
2315 uris
, nb_uri
, session
->consumer
, new_output
, &session
->snapshot
);
2317 if (ret
== -ENOMEM
) {
2318 ret
= LTTNG_ERR_NOMEM
;
2320 ret
= LTTNG_ERR_INVALID
;
2322 goto error_snapshot
;
2326 snapshot_add_output(&session
->snapshot
, new_output
);
2333 snapshot_output_destroy(new_output
);
2334 error_snapshot_alloc
:
2335 session_destroy(session
);
2341 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2343 * Called with session lock held.
2345 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
2348 struct ltt_ust_session
*usess
;
2349 struct ltt_kernel_session
*ksess
;
2354 usess
= session
->ust_session
;
2355 ksess
= session
->kernel_session
;
2357 /* Clean kernel session teardown */
2358 kernel_destroy_session(ksess
);
2360 /* UST session teardown */
2362 /* Close any relayd session */
2363 consumer_output_send_destroy_relayd(usess
->consumer
);
2365 /* Destroy every UST application related to this session. */
2366 ret
= ust_app_destroy_trace_all(usess
);
2368 ERR("Error in ust_app_destroy_trace_all");
2371 /* Clean up the rest. */
2372 trace_ust_destroy_session(usess
);
2376 * Must notify the kernel thread here to update it's poll set in order to
2377 * remove the channel(s)' fd just destroyed.
2379 ret
= notify_thread_pipe(wpipe
);
2381 PERROR("write kernel poll pipe");
2384 ret
= session_destroy(session
);
2390 * Command LTTNG_CALIBRATE processed by the client thread.
2392 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
2397 case LTTNG_DOMAIN_KERNEL
:
2399 struct lttng_kernel_calibrate kcalibrate
;
2401 switch (calibrate
->type
) {
2402 case LTTNG_CALIBRATE_FUNCTION
:
2404 /* Default and only possible calibrate option. */
2405 kcalibrate
.type
= LTTNG_KERNEL_CALIBRATE_KRETPROBE
;
2409 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2411 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
2416 case LTTNG_DOMAIN_UST
:
2418 struct lttng_ust_calibrate ucalibrate
;
2420 switch (calibrate
->type
) {
2421 case LTTNG_CALIBRATE_FUNCTION
:
2423 /* Default and only possible calibrate option. */
2424 ucalibrate
.type
= LTTNG_UST_CALIBRATE_TRACEPOINT
;
2428 ret
= ust_app_calibrate_glb(&ucalibrate
);
2430 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
2436 ret
= LTTNG_ERR_UND
;
2447 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2449 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2450 const char *sock_path
, struct consumer_data
*cdata
)
2453 struct consumer_socket
*socket
= NULL
;
2460 case LTTNG_DOMAIN_KERNEL
:
2462 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2466 /* Can't register a consumer if there is already one */
2467 if (ksess
->consumer_fds_sent
!= 0) {
2468 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2472 sock
= lttcomm_connect_unix_sock(sock_path
);
2474 ret
= LTTNG_ERR_CONNECT_FAIL
;
2477 cdata
->cmd_sock
= sock
;
2479 socket
= consumer_allocate_socket(&cdata
->cmd_sock
);
2480 if (socket
== NULL
) {
2483 PERROR("close register consumer");
2485 cdata
->cmd_sock
= -1;
2486 ret
= LTTNG_ERR_FATAL
;
2490 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
2491 if (socket
->lock
== NULL
) {
2492 PERROR("zmalloc pthread mutex");
2493 ret
= LTTNG_ERR_FATAL
;
2496 pthread_mutex_init(socket
->lock
, NULL
);
2497 socket
->registered
= 1;
2500 consumer_add_socket(socket
, ksess
->consumer
);
2503 pthread_mutex_lock(&cdata
->pid_mutex
);
2505 pthread_mutex_unlock(&cdata
->pid_mutex
);
2510 /* TODO: Userspace tracing */
2511 ret
= LTTNG_ERR_UND
;
2519 consumer_destroy_socket(socket
);
2525 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2527 ssize_t
cmd_list_domains(struct ltt_session
*session
,
2528 struct lttng_domain
**domains
)
2533 struct lttng_ht_iter iter
;
2535 if (session
->kernel_session
!= NULL
) {
2536 DBG3("Listing domains found kernel domain");
2540 if (session
->ust_session
!= NULL
) {
2541 DBG3("Listing domains found UST global domain");
2545 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
2547 if (agt
->being_used
) {
2558 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2559 if (*domains
== NULL
) {
2560 ret
= LTTNG_ERR_FATAL
;
2564 if (session
->kernel_session
!= NULL
) {
2565 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2567 /* Kernel session buffer type is always GLOBAL */
2568 (*domains
)[index
].buf_type
= LTTNG_BUFFER_GLOBAL
;
2573 if (session
->ust_session
!= NULL
) {
2574 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2575 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2579 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
2581 if (agt
->being_used
) {
2582 (*domains
)[index
].type
= agt
->domain
;
2583 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2593 /* Return negative value to differentiate return code */
2599 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2601 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
2602 struct lttng_channel
**channels
)
2605 ssize_t nb_chan
= 0;
2608 case LTTNG_DOMAIN_KERNEL
:
2609 if (session
->kernel_session
!= NULL
) {
2610 nb_chan
= session
->kernel_session
->channel_count
;
2612 DBG3("Number of kernel channels %zd", nb_chan
);
2614 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2617 case LTTNG_DOMAIN_UST
:
2618 if (session
->ust_session
!= NULL
) {
2620 nb_chan
= lttng_ht_get_count(
2621 session
->ust_session
->domain_global
.channels
);
2624 DBG3("Number of UST global channels %zd", nb_chan
);
2626 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2631 ret
= LTTNG_ERR_UND
;
2636 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2637 if (*channels
== NULL
) {
2638 ret
= LTTNG_ERR_FATAL
;
2642 list_lttng_channels(domain
, session
, *channels
);
2648 /* Return negative value to differentiate return code */
2653 * Command LTTNG_LIST_EVENTS processed by the client thread.
2655 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2656 char *channel_name
, struct lttng_event
**events
)
2659 ssize_t nb_event
= 0;
2662 case LTTNG_DOMAIN_KERNEL
:
2663 if (session
->kernel_session
!= NULL
) {
2664 nb_event
= list_lttng_kernel_events(channel_name
,
2665 session
->kernel_session
, events
);
2668 case LTTNG_DOMAIN_UST
:
2670 if (session
->ust_session
!= NULL
) {
2671 nb_event
= list_lttng_ust_global_events(channel_name
,
2672 &session
->ust_session
->domain_global
, events
);
2676 case LTTNG_DOMAIN_LOG4J
:
2677 case LTTNG_DOMAIN_JUL
:
2678 case LTTNG_DOMAIN_PYTHON
:
2679 if (session
->ust_session
) {
2680 struct lttng_ht_iter iter
;
2684 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
,
2685 &iter
.iter
, agt
, node
.node
) {
2686 nb_event
= list_lttng_agent_events(agt
, events
);
2692 ret
= LTTNG_ERR_UND
;
2699 /* Return negative value to differentiate return code */
2704 * Using the session list, filled a lttng_session array to send back to the
2705 * client for session listing.
2707 * The session list lock MUST be acquired before calling this function. Use
2708 * session_lock_list() and session_unlock_list().
2710 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2715 struct ltt_session
*session
;
2716 struct ltt_session_list
*list
= session_get_list();
2718 DBG("Getting all available session for UID %d GID %d",
2721 * Iterate over session list and append data after the control struct in
2724 cds_list_for_each_entry(session
, &list
->head
, list
) {
2726 * Only list the sessions the user can control.
2728 if (!session_access_ok(session
, uid
, gid
)) {
2732 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2733 struct ltt_ust_session
*usess
= session
->ust_session
;
2735 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2736 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2737 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2738 ret
= build_network_session_path(sessions
[i
].path
,
2739 sizeof(sessions
[i
].path
), session
);
2741 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
2742 session
->consumer
->dst
.trace_path
);
2745 PERROR("snprintf session path");
2749 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2750 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2751 sessions
[i
].enabled
= session
->active
;
2752 sessions
[i
].snapshot_mode
= session
->snapshot_mode
;
2753 sessions
[i
].live_timer_interval
= session
->live_timer
;
2759 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2760 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2762 int cmd_data_pending(struct ltt_session
*session
)
2765 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2766 struct ltt_ust_session
*usess
= session
->ust_session
;
2770 /* Session MUST be stopped to ask for data availability. */
2771 if (session
->active
) {
2772 ret
= LTTNG_ERR_SESSION_STARTED
;
2776 * If stopped, just make sure we've started before else the above call
2777 * will always send that there is data pending.
2779 * The consumer assumes that when the data pending command is received,
2780 * the trace has been started before or else no output data is written
2781 * by the streams which is a condition for data pending. So, this is
2782 * *VERY* important that we don't ask the consumer before a start
2785 if (!session
->has_been_started
) {
2791 if (ksess
&& ksess
->consumer
) {
2792 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2794 /* Data is still being extracted for the kernel. */
2799 if (usess
&& usess
->consumer
) {
2800 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2802 /* Data is still being extracted for the kernel. */
2807 /* Data is ready to be read by a viewer */
2815 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2817 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2819 int cmd_snapshot_add_output(struct ltt_session
*session
,
2820 struct lttng_snapshot_output
*output
, uint32_t *id
)
2823 struct snapshot_output
*new_output
;
2828 DBG("Cmd snapshot add output for session %s", session
->name
);
2831 * Permission denied to create an output if the session is not
2832 * set in no output mode.
2834 if (session
->output_traces
) {
2835 ret
= LTTNG_ERR_EPERM
;
2839 /* Only one output is allowed until we have the "tee" feature. */
2840 if (session
->snapshot
.nb_output
== 1) {
2841 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
2845 new_output
= snapshot_output_alloc();
2847 ret
= LTTNG_ERR_NOMEM
;
2851 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2852 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
2853 &session
->snapshot
);
2855 if (ret
== -ENOMEM
) {
2856 ret
= LTTNG_ERR_NOMEM
;
2858 ret
= LTTNG_ERR_INVALID
;
2864 snapshot_add_output(&session
->snapshot
, new_output
);
2866 *id
= new_output
->id
;
2873 snapshot_output_destroy(new_output
);
2879 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2881 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2883 int cmd_snapshot_del_output(struct ltt_session
*session
,
2884 struct lttng_snapshot_output
*output
)
2887 struct snapshot_output
*sout
= NULL
;
2895 * Permission denied to create an output if the session is not
2896 * set in no output mode.
2898 if (session
->output_traces
) {
2899 ret
= LTTNG_ERR_EPERM
;
2904 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
2906 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
2907 } else if (*output
->name
!= '\0') {
2908 DBG("Cmd snapshot del output name %s for session %s", output
->name
,
2910 sout
= snapshot_find_output_by_name(output
->name
, &session
->snapshot
);
2913 ret
= LTTNG_ERR_INVALID
;
2917 snapshot_delete_output(&session
->snapshot
, sout
);
2918 snapshot_output_destroy(sout
);
2927 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2929 * If no output is available, outputs is untouched and 0 is returned.
2931 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2933 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
2934 struct lttng_snapshot_output
**outputs
)
2937 struct lttng_snapshot_output
*list
= NULL
;
2938 struct lttng_ht_iter iter
;
2939 struct snapshot_output
*output
;
2944 DBG("Cmd snapshot list outputs for session %s", session
->name
);
2947 * Permission denied to create an output if the session is not
2948 * set in no output mode.
2950 if (session
->output_traces
) {
2951 ret
= -LTTNG_ERR_EPERM
;
2955 if (session
->snapshot
.nb_output
== 0) {
2960 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
2962 ret
= -LTTNG_ERR_NOMEM
;
2966 /* Copy list from session to the new list object. */
2968 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
2969 output
, node
.node
) {
2970 assert(output
->consumer
);
2971 list
[idx
].id
= output
->id
;
2972 list
[idx
].max_size
= output
->max_size
;
2973 strncpy(list
[idx
].name
, output
->name
, sizeof(list
[idx
].name
));
2974 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
2975 strncpy(list
[idx
].ctrl_url
, output
->consumer
->dst
.trace_path
,
2976 sizeof(list
[idx
].ctrl_url
));
2979 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
2980 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
2982 ret
= -LTTNG_ERR_NOMEM
;
2987 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
2988 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
2990 ret
= -LTTNG_ERR_NOMEM
;
2999 ret
= session
->snapshot
.nb_output
;
3007 * Send relayd sockets from snapshot output to consumer. Ignore request if the
3008 * snapshot output is *not* set with a remote destination.
3010 * Return 0 on success or a LTTNG_ERR code.
3012 static int set_relayd_for_snapshot(struct consumer_output
*consumer
,
3013 struct snapshot_output
*snap_output
, struct ltt_session
*session
)
3016 struct lttng_ht_iter iter
;
3017 struct consumer_socket
*socket
;
3020 assert(snap_output
);
3023 DBG2("Set relayd object from snapshot output");
3025 /* Ignore if snapshot consumer output is not network. */
3026 if (snap_output
->consumer
->type
!= CONSUMER_DST_NET
) {
3031 * For each consumer socket, create and send the relayd object of the
3035 cds_lfht_for_each_entry(snap_output
->consumer
->socks
->ht
, &iter
.iter
,
3036 socket
, node
.node
) {
3037 ret
= send_consumer_relayd_sockets(0, session
->id
,
3038 snap_output
->consumer
, socket
,
3039 session
->name
, session
->hostname
,
3040 session
->live_timer
);
3041 if (ret
!= LTTNG_OK
) {
3053 * Record a kernel snapshot.
3055 * Return LTTNG_OK on success or a LTTNG_ERR code.
3057 static int record_kernel_snapshot(struct ltt_kernel_session
*ksess
,
3058 struct snapshot_output
*output
, struct ltt_session
*session
,
3059 int wait
, uint64_t nb_packets_per_stream
)
3067 /* Get the datetime for the snapshot output directory. */
3068 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
3069 sizeof(output
->datetime
));
3071 ret
= LTTNG_ERR_INVALID
;
3076 * Copy kernel session sockets so we can communicate with the right
3077 * consumer for the snapshot record command.
3079 ret
= consumer_copy_sockets(output
->consumer
, ksess
->consumer
);
3081 ret
= LTTNG_ERR_NOMEM
;
3085 ret
= set_relayd_for_snapshot(ksess
->consumer
, output
, session
);
3086 if (ret
!= LTTNG_OK
) {
3087 goto error_snapshot
;
3090 ret
= kernel_snapshot_record(ksess
, output
, wait
, nb_packets_per_stream
);
3091 if (ret
!= LTTNG_OK
) {
3092 goto error_snapshot
;
3099 /* Clean up copied sockets so this output can use some other later on. */
3100 consumer_destroy_output_sockets(output
->consumer
);
3107 * Record a UST snapshot.
3109 * Return 0 on success or a LTTNG_ERR error code.
3111 static int record_ust_snapshot(struct ltt_ust_session
*usess
,
3112 struct snapshot_output
*output
, struct ltt_session
*session
,
3113 int wait
, uint64_t nb_packets_per_stream
)
3121 /* Get the datetime for the snapshot output directory. */
3122 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
3123 sizeof(output
->datetime
));
3125 ret
= LTTNG_ERR_INVALID
;
3130 * Copy UST session sockets so we can communicate with the right
3131 * consumer for the snapshot record command.
3133 ret
= consumer_copy_sockets(output
->consumer
, usess
->consumer
);
3135 ret
= LTTNG_ERR_NOMEM
;
3139 ret
= set_relayd_for_snapshot(usess
->consumer
, output
, session
);
3140 if (ret
!= LTTNG_OK
) {
3141 goto error_snapshot
;
3144 ret
= ust_app_snapshot_record(usess
, output
, wait
, nb_packets_per_stream
);
3148 ret
= LTTNG_ERR_INVALID
;
3151 ret
= LTTNG_ERR_SNAPSHOT_NODATA
;
3154 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
3157 goto error_snapshot
;
3163 /* Clean up copied sockets so this output can use some other later on. */
3164 consumer_destroy_output_sockets(output
->consumer
);
3170 uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session
*session
,
3171 uint64_t cur_nr_packets
)
3173 uint64_t tot_size
= 0;
3175 if (session
->kernel_session
) {
3176 struct ltt_kernel_channel
*chan
;
3177 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3179 cds_list_for_each_entry(chan
, &ksess
->channel_list
.head
, list
) {
3180 if (cur_nr_packets
>= chan
->channel
->attr
.num_subbuf
) {
3182 * Don't take channel into account if we
3183 * already grab all its packets.
3187 tot_size
+= chan
->channel
->attr
.subbuf_size
3188 * chan
->stream_count
;
3192 if (session
->ust_session
) {
3193 struct ltt_ust_session
*usess
= session
->ust_session
;
3195 tot_size
+= ust_app_get_size_one_more_packet_per_stream(usess
,
3203 * Calculate the number of packets we can grab from each stream that
3204 * fits within the overall snapshot max size.
3206 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
3207 * the number of packets per stream.
3209 * TODO: this approach is not perfect: we consider the worse case
3210 * (packet filling the sub-buffers) as an upper bound, but we could do
3211 * better if we do this calculation while we actually grab the packet
3212 * content: we would know how much padding we don't actually store into
3215 * This algorithm is currently bounded by the number of packets per
3218 * Since we call this algorithm before actually grabbing the data, it's
3219 * an approximation: for instance, applications could appear/disappear
3220 * in between this call and actually grabbing data.
3223 int64_t get_session_nb_packets_per_stream(struct ltt_session
*session
, uint64_t max_size
)
3226 uint64_t cur_nb_packets
= 0;
3229 return 0; /* Infinite */
3232 size_left
= max_size
;
3234 uint64_t one_more_packet_tot_size
;
3236 one_more_packet_tot_size
= get_session_size_one_more_packet_per_stream(session
,
3238 if (!one_more_packet_tot_size
) {
3239 /* We are already grabbing all packets. */
3242 size_left
-= one_more_packet_tot_size
;
3243 if (size_left
< 0) {
3248 if (!cur_nb_packets
) {
3249 /* Not enough room to grab one packet of each stream, error. */
3252 return cur_nb_packets
;
3256 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3258 * The wait parameter is ignored so this call always wait for the snapshot to
3259 * complete before returning.
3261 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3263 int cmd_snapshot_record(struct ltt_session
*session
,
3264 struct lttng_snapshot_output
*output
, int wait
)
3267 unsigned int use_tmp_output
= 0;
3268 struct snapshot_output tmp_output
;
3269 unsigned int snapshot_success
= 0;
3274 DBG("Cmd snapshot record for session %s", session
->name
);
3277 * Permission denied to create an output if the session is not
3278 * set in no output mode.
3280 if (session
->output_traces
) {
3281 ret
= LTTNG_ERR_EPERM
;
3285 /* The session needs to be started at least once. */
3286 if (!session
->has_been_started
) {
3287 ret
= LTTNG_ERR_START_SESSION_ONCE
;
3291 /* Use temporary output for the session. */
3292 if (*output
->ctrl_url
!= '\0') {
3293 ret
= snapshot_output_init(output
->max_size
, output
->name
,
3294 output
->ctrl_url
, output
->data_url
, session
->consumer
,
3297 if (ret
== -ENOMEM
) {
3298 ret
= LTTNG_ERR_NOMEM
;
3300 ret
= LTTNG_ERR_INVALID
;
3304 /* Use the global session count for the temporary snapshot. */
3305 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3309 if (session
->kernel_session
) {
3310 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3312 if (use_tmp_output
) {
3313 int64_t nb_packets_per_stream
;
3315 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
3316 tmp_output
.max_size
);
3317 if (nb_packets_per_stream
< 0) {
3318 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3321 ret
= record_kernel_snapshot(ksess
, &tmp_output
, session
,
3322 wait
, nb_packets_per_stream
);
3323 if (ret
!= LTTNG_OK
) {
3326 snapshot_success
= 1;
3328 struct snapshot_output
*sout
;
3329 struct lttng_ht_iter iter
;
3332 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
3333 &iter
.iter
, sout
, node
.node
) {
3334 int64_t nb_packets_per_stream
;
3337 * Make a local copy of the output and assign the possible
3338 * temporary value given by the caller.
3340 memset(&tmp_output
, 0, sizeof(tmp_output
));
3341 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
3343 if (output
->max_size
!= (uint64_t) -1ULL) {
3344 tmp_output
.max_size
= output
->max_size
;
3347 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
3348 tmp_output
.max_size
);
3349 if (nb_packets_per_stream
< 0) {
3350 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3354 /* Use temporary name. */
3355 if (*output
->name
!= '\0') {
3356 strncpy(tmp_output
.name
, output
->name
,
3357 sizeof(tmp_output
.name
));
3360 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3362 ret
= record_kernel_snapshot(ksess
, &tmp_output
,
3363 session
, wait
, nb_packets_per_stream
);
3364 if (ret
!= LTTNG_OK
) {
3368 snapshot_success
= 1;
3374 if (session
->ust_session
) {
3375 struct ltt_ust_session
*usess
= session
->ust_session
;
3377 if (use_tmp_output
) {
3378 int64_t nb_packets_per_stream
;
3380 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
3381 tmp_output
.max_size
);
3382 if (nb_packets_per_stream
< 0) {
3383 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3386 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
3387 wait
, nb_packets_per_stream
);
3388 if (ret
!= LTTNG_OK
) {
3391 snapshot_success
= 1;
3393 struct snapshot_output
*sout
;
3394 struct lttng_ht_iter iter
;
3397 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
3398 &iter
.iter
, sout
, node
.node
) {
3399 int64_t nb_packets_per_stream
;
3402 * Make a local copy of the output and assign the possible
3403 * temporary value given by the caller.
3405 memset(&tmp_output
, 0, sizeof(tmp_output
));
3406 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
3408 if (output
->max_size
!= (uint64_t) -1ULL) {
3409 tmp_output
.max_size
= output
->max_size
;
3412 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
3413 tmp_output
.max_size
);
3414 if (nb_packets_per_stream
< 0) {
3415 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3420 /* Use temporary name. */
3421 if (*output
->name
!= '\0') {
3422 strncpy(tmp_output
.name
, output
->name
,
3423 sizeof(tmp_output
.name
));
3426 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3428 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
3429 wait
, nb_packets_per_stream
);
3430 if (ret
!= LTTNG_OK
) {
3434 snapshot_success
= 1;
3440 if (snapshot_success
) {
3441 session
->snapshot
.nb_snapshot
++;
3443 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
3451 * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
3453 int cmd_set_session_shm_path(struct ltt_session
*session
,
3454 const char *shm_path
)
3460 * Can only set shm path before session is started.
3462 if (session
->has_been_started
) {
3463 return LTTNG_ERR_SESSION_STARTED
;
3466 strncpy(session
->shm_path
, shm_path
,
3467 sizeof(session
->shm_path
));
3468 session
->shm_path
[sizeof(session
->shm_path
) - 1] = '\0';
3474 * Init command subsystem.
3479 * Set network sequence index to 1 for streams to match a relayd
3480 * socket on the consumer side.
3482 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
3483 relayd_net_seq_idx
= 1;
3484 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
3486 DBG("Command subsystem initialized");