2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License, version 2 only, as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 51
16 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 #include <urcu/list.h>
23 #include <urcu/uatomic.h>
25 #include <common/defaults.h>
26 #include <common/common.h>
27 #include <common/sessiond-comm/sessiond-comm.h>
28 #include <common/relayd/relayd.h>
29 #include <common/utils.h>
30 #include <common/compat/string.h>
35 #include "health-sessiond.h"
37 #include "kernel-consumer.h"
38 #include "lttng-sessiond.h"
46 * Used to keep a unique index for each relayd socket created where this value
47 * is associated with streams on the consumer so it can match the right relayd
48 * to send to. It must be accessed with the relayd_net_seq_idx_lock
51 static pthread_mutex_t relayd_net_seq_idx_lock
= PTHREAD_MUTEX_INITIALIZER
;
52 static uint64_t relayd_net_seq_idx
;
54 static int validate_event_name(const char *);
55 static int validate_ust_event_name(const char *);
56 static int cmd_enable_event_internal(struct ltt_session
*session
,
57 struct lttng_domain
*domain
,
58 char *channel_name
, struct lttng_event
*event
,
59 char *filter_expression
,
60 struct lttng_filter_bytecode
*filter
,
61 struct lttng_event_exclusion
*exclusion
,
65 * Create a session path used by list_lttng_sessions for the case that the
66 * session consumer is on the network.
68 static int build_network_session_path(char *dst
, size_t size
,
69 struct ltt_session
*session
)
71 int ret
, kdata_port
, udata_port
;
72 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
73 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
78 memset(tmp_urls
, 0, sizeof(tmp_urls
));
79 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
81 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
83 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
84 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
85 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
88 if (session
->ust_session
&& session
->ust_session
->consumer
) {
89 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
90 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
93 if (uuri
== NULL
&& kuri
== NULL
) {
94 uri
= &session
->consumer
->dst
.net
.control
;
95 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
96 } else if (kuri
&& uuri
) {
97 ret
= uri_compare(kuri
, uuri
);
101 /* Build uuri URL string */
102 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
109 } else if (kuri
&& uuri
== NULL
) {
111 } else if (uuri
&& kuri
== NULL
) {
115 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
121 * Do we have a UST url set. If yes, this means we have both kernel and UST
124 if (*tmp_uurl
!= '\0') {
125 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
126 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
129 if (kuri
|| (!kuri
&& !uuri
)) {
132 /* No kernel URI, use the UST port. */
135 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, dport
);
143 * Get run-time attributes if the session has been started (discarded events,
146 static int get_kernel_runtime_stats(struct ltt_session
*session
,
147 struct ltt_kernel_channel
*kchan
, uint64_t *discarded_events
,
148 uint64_t *lost_packets
)
152 if (!session
->has_been_started
) {
154 *discarded_events
= 0;
159 ret
= consumer_get_discarded_events(session
->id
, kchan
->fd
,
160 session
->kernel_session
->consumer
,
166 ret
= consumer_get_lost_packets(session
->id
, kchan
->fd
,
167 session
->kernel_session
->consumer
,
178 * Get run-time attributes if the session has been started (discarded events,
181 static int get_ust_runtime_stats(struct ltt_session
*session
,
182 struct ltt_ust_channel
*uchan
, uint64_t *discarded_events
,
183 uint64_t *lost_packets
)
186 struct ltt_ust_session
*usess
;
188 usess
= session
->ust_session
;
190 if (!usess
|| !session
->has_been_started
) {
191 *discarded_events
= 0;
197 if (usess
->buffer_type
== LTTNG_BUFFER_PER_UID
) {
198 ret
= ust_app_uid_get_channel_runtime_stats(usess
->id
,
199 &usess
->buffer_reg_uid_list
,
200 usess
->consumer
, uchan
->id
,
201 uchan
->attr
.overwrite
,
204 } else if (usess
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
205 ret
= ust_app_pid_get_channel_runtime_stats(usess
,
206 uchan
, usess
->consumer
,
207 uchan
->attr
.overwrite
,
213 *discarded_events
+= uchan
->per_pid_closed_app_discarded
;
214 *lost_packets
+= uchan
->per_pid_closed_app_lost
;
216 ERR("Unsupported buffer type");
226 * Fill lttng_channel array of all channels.
228 static void list_lttng_channels(enum lttng_domain_type domain
,
229 struct ltt_session
*session
, struct lttng_channel
*channels
,
230 struct lttcomm_channel_extended
*chan_exts
)
233 struct ltt_kernel_channel
*kchan
;
235 DBG("Listing channels for session %s", session
->name
);
238 case LTTNG_DOMAIN_KERNEL
:
239 /* Kernel channels */
240 if (session
->kernel_session
!= NULL
) {
241 cds_list_for_each_entry(kchan
,
242 &session
->kernel_session
->channel_list
.head
, list
) {
243 uint64_t discarded_events
, lost_packets
;
245 ret
= get_kernel_runtime_stats(session
, kchan
,
246 &discarded_events
, &lost_packets
);
250 /* Copy lttng_channel struct to array */
251 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
252 channels
[i
].enabled
= kchan
->enabled
;
253 chan_exts
[i
].discarded_events
=
255 chan_exts
[i
].lost_packets
= lost_packets
;
260 case LTTNG_DOMAIN_UST
:
262 struct lttng_ht_iter iter
;
263 struct ltt_ust_channel
*uchan
;
266 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
267 &iter
.iter
, uchan
, node
.node
) {
268 uint64_t discarded_events
, lost_packets
;
270 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
271 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
272 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
273 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
274 channels
[i
].attr
.switch_timer_interval
=
275 uchan
->attr
.switch_timer_interval
;
276 channels
[i
].attr
.read_timer_interval
=
277 uchan
->attr
.read_timer_interval
;
278 channels
[i
].enabled
= uchan
->enabled
;
279 channels
[i
].attr
.tracefile_size
= uchan
->tracefile_size
;
280 channels
[i
].attr
.tracefile_count
= uchan
->tracefile_count
;
283 * Map enum lttng_ust_output to enum lttng_event_output.
285 switch (uchan
->attr
.output
) {
287 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
291 * LTTNG_UST_MMAP is the only supported UST
298 ret
= get_ust_runtime_stats(session
, uchan
,
299 &discarded_events
, &lost_packets
);
303 chan_exts
[i
].discarded_events
= discarded_events
;
304 chan_exts
[i
].lost_packets
= lost_packets
;
318 static void increment_extended_len(const char *filter_expression
,
319 struct lttng_event_exclusion
*exclusion
, size_t *extended_len
)
321 *extended_len
+= sizeof(struct lttcomm_event_extended_header
);
323 if (filter_expression
) {
324 *extended_len
+= strlen(filter_expression
) + 1;
328 *extended_len
+= exclusion
->count
* LTTNG_SYMBOL_NAME_LEN
;
332 static void append_extended_info(const char *filter_expression
,
333 struct lttng_event_exclusion
*exclusion
, void **extended_at
)
335 struct lttcomm_event_extended_header extended_header
;
336 size_t filter_len
= 0;
337 size_t nb_exclusions
= 0;
339 if (filter_expression
) {
340 filter_len
= strlen(filter_expression
) + 1;
344 nb_exclusions
= exclusion
->count
;
347 /* Set header fields */
348 extended_header
.filter_len
= filter_len
;
349 extended_header
.nb_exclusions
= nb_exclusions
;
352 memcpy(*extended_at
, &extended_header
, sizeof(extended_header
));
353 *extended_at
+= sizeof(extended_header
);
355 /* Copy filter string */
356 if (filter_expression
) {
357 memcpy(*extended_at
, filter_expression
, filter_len
);
358 *extended_at
+= filter_len
;
361 /* Copy exclusion names */
363 size_t len
= nb_exclusions
* LTTNG_SYMBOL_NAME_LEN
;
365 memcpy(*extended_at
, &exclusion
->names
, len
);
371 * Create a list of agent domain events.
373 * Return number of events in list on success or else a negative value.
375 static int list_lttng_agent_events(struct agent
*agt
,
376 struct lttng_event
**events
, size_t *total_size
)
379 unsigned int nb_event
= 0;
380 struct agent_event
*event
;
381 struct lttng_event
*tmp_events
;
382 struct lttng_ht_iter iter
;
383 size_t extended_len
= 0;
389 DBG3("Listing agent events");
392 nb_event
= lttng_ht_get_count(agt
->events
);
400 /* Compute required extended infos size */
401 extended_len
= nb_event
* sizeof(struct lttcomm_event_extended_header
);
404 * This is only valid because the commands which add events are
405 * processed in the same thread as the listing.
408 cds_lfht_for_each_entry(agt
->events
->ht
, &iter
.iter
, event
, node
.node
) {
409 increment_extended_len(event
->filter_expression
, NULL
,
414 *total_size
= nb_event
* sizeof(*tmp_events
) + extended_len
;
415 tmp_events
= zmalloc(*total_size
);
417 PERROR("zmalloc agent events session");
418 ret
= -LTTNG_ERR_FATAL
;
422 extended_at
= ((uint8_t *) tmp_events
) +
423 nb_event
* sizeof(struct lttng_event
);
426 cds_lfht_for_each_entry(agt
->events
->ht
, &iter
.iter
, event
, node
.node
) {
427 strncpy(tmp_events
[i
].name
, event
->name
, sizeof(tmp_events
[i
].name
));
428 tmp_events
[i
].name
[sizeof(tmp_events
[i
].name
) - 1] = '\0';
429 tmp_events
[i
].enabled
= event
->enabled
;
430 tmp_events
[i
].loglevel
= event
->loglevel_value
;
431 tmp_events
[i
].loglevel_type
= event
->loglevel_type
;
434 /* Append extended info */
435 append_extended_info(event
->filter_expression
, NULL
,
440 *events
= tmp_events
;
444 assert(nb_event
== i
);
449 * Create a list of ust global domain events.
451 static int list_lttng_ust_global_events(char *channel_name
,
452 struct ltt_ust_domain_global
*ust_global
,
453 struct lttng_event
**events
, size_t *total_size
)
456 unsigned int nb_event
= 0;
457 struct lttng_ht_iter iter
;
458 struct lttng_ht_node_str
*node
;
459 struct ltt_ust_channel
*uchan
;
460 struct ltt_ust_event
*uevent
;
461 struct lttng_event
*tmp
;
462 size_t extended_len
= 0;
465 DBG("Listing UST global events for channel %s", channel_name
);
469 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
470 node
= lttng_ht_iter_get_node_str(&iter
);
472 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
476 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
478 nb_event
= lttng_ht_get_count(uchan
->events
);
485 DBG3("Listing UST global %d events", nb_event
);
487 /* Compute required extended infos size */
488 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
489 if (uevent
->internal
) {
494 increment_extended_len(uevent
->filter_expression
,
495 uevent
->exclusion
, &extended_len
);
498 /* All events are internal, skip. */
504 *total_size
= nb_event
* sizeof(struct lttng_event
) + extended_len
;
505 tmp
= zmalloc(*total_size
);
507 ret
= -LTTNG_ERR_FATAL
;
511 extended_at
= ((uint8_t *) tmp
) + nb_event
* sizeof(struct lttng_event
);
513 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
514 if (uevent
->internal
) {
515 /* This event should remain hidden from clients */
518 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
519 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
520 tmp
[i
].enabled
= uevent
->enabled
;
522 switch (uevent
->attr
.instrumentation
) {
523 case LTTNG_UST_TRACEPOINT
:
524 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
526 case LTTNG_UST_PROBE
:
527 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
529 case LTTNG_UST_FUNCTION
:
530 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
534 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
535 switch (uevent
->attr
.loglevel_type
) {
536 case LTTNG_UST_LOGLEVEL_ALL
:
537 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
539 case LTTNG_UST_LOGLEVEL_RANGE
:
540 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
542 case LTTNG_UST_LOGLEVEL_SINGLE
:
543 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
546 if (uevent
->filter
) {
549 if (uevent
->exclusion
) {
550 tmp
[i
].exclusion
= 1;
554 /* Append extended info */
555 append_extended_info(uevent
->filter_expression
,
556 uevent
->exclusion
, &extended_at
);
567 * Fill lttng_event array of all kernel events in the channel.
569 static int list_lttng_kernel_events(char *channel_name
,
570 struct ltt_kernel_session
*kernel_session
,
571 struct lttng_event
**events
, size_t *total_size
)
574 unsigned int nb_event
;
575 struct ltt_kernel_event
*event
;
576 struct ltt_kernel_channel
*kchan
;
577 size_t extended_len
= 0;
580 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
582 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
586 nb_event
= kchan
->event_count
;
588 DBG("Listing events for channel %s", kchan
->channel
->name
);
596 /* Compute required extended infos size */
597 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
598 increment_extended_len(event
->filter_expression
, NULL
,
602 *total_size
= nb_event
* sizeof(struct lttng_event
) + extended_len
;
603 *events
= zmalloc(*total_size
);
604 if (*events
== NULL
) {
605 ret
= LTTNG_ERR_FATAL
;
609 extended_at
= ((void *) *events
) +
610 nb_event
* sizeof(struct lttng_event
);
612 /* Kernel channels */
613 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
614 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
615 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
616 (*events
)[i
].enabled
= event
->enabled
;
617 (*events
)[i
].filter
=
618 (unsigned char) !!event
->filter_expression
;
620 switch (event
->event
->instrumentation
) {
621 case LTTNG_KERNEL_TRACEPOINT
:
622 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
624 case LTTNG_KERNEL_KRETPROBE
:
625 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
626 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
627 sizeof(struct lttng_kernel_kprobe
));
629 case LTTNG_KERNEL_KPROBE
:
630 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
631 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
632 sizeof(struct lttng_kernel_kprobe
));
634 case LTTNG_KERNEL_FUNCTION
:
635 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
636 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
637 sizeof(struct lttng_kernel_function
));
639 case LTTNG_KERNEL_NOOP
:
640 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
642 case LTTNG_KERNEL_SYSCALL
:
643 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
645 case LTTNG_KERNEL_ALL
:
651 /* Append extended info */
652 append_extended_info(event
->filter_expression
, NULL
,
660 /* Negate the error code to differentiate the size from an error */
665 * Add URI so the consumer output object. Set the correct path depending on the
666 * domain adding the default trace directory.
668 static int add_uri_to_consumer(struct consumer_output
*consumer
,
669 struct lttng_uri
*uri
, enum lttng_domain_type domain
,
670 const char *session_name
)
673 const char *default_trace_dir
;
677 if (consumer
== NULL
) {
678 DBG("No consumer detected. Don't add URI. Stopping.");
679 ret
= LTTNG_ERR_NO_CONSUMER
;
684 case LTTNG_DOMAIN_KERNEL
:
685 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
687 case LTTNG_DOMAIN_UST
:
688 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
692 * This case is possible is we try to add the URI to the global tracing
693 * session consumer object which in this case there is no subdir.
695 default_trace_dir
= "";
698 switch (uri
->dtype
) {
701 DBG2("Setting network URI to consumer");
703 if (consumer
->type
== CONSUMER_DST_NET
) {
704 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
705 consumer
->dst
.net
.control_isset
) ||
706 (uri
->stype
== LTTNG_STREAM_DATA
&&
707 consumer
->dst
.net
.data_isset
)) {
708 ret
= LTTNG_ERR_URL_EXIST
;
712 memset(&consumer
->dst
.net
, 0, sizeof(consumer
->dst
.net
));
715 consumer
->type
= CONSUMER_DST_NET
;
717 /* Set URI into consumer output object */
718 ret
= consumer_set_network_uri(consumer
, uri
);
722 } else if (ret
== 1) {
724 * URI was the same in the consumer so we do not append the subdir
725 * again so to not duplicate output dir.
731 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
732 ret
= consumer_set_subdir(consumer
, session_name
);
734 ret
= LTTNG_ERR_FATAL
;
739 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
740 /* On a new subdir, reappend the default trace dir. */
741 strncat(consumer
->subdir
, default_trace_dir
,
742 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
743 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
748 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
749 memset(consumer
->dst
.trace_path
, 0,
750 sizeof(consumer
->dst
.trace_path
));
751 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
752 sizeof(consumer
->dst
.trace_path
));
753 /* Append default trace dir */
754 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
755 sizeof(consumer
->dst
.trace_path
) -
756 strlen(consumer
->dst
.trace_path
) - 1);
757 /* Flag consumer as local. */
758 consumer
->type
= CONSUMER_DST_LOCAL
;
769 * Init tracing by creating trace directory and sending fds kernel consumer.
771 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
774 struct lttng_ht_iter iter
;
775 struct consumer_socket
*socket
;
781 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
782 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
784 pthread_mutex_lock(socket
->lock
);
785 ret
= kernel_consumer_send_session(socket
, session
);
786 pthread_mutex_unlock(socket
->lock
);
788 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
800 * Create a socket to the relayd using the URI.
802 * On success, the relayd_sock pointer is set to the created socket.
803 * Else, it's stays untouched and a lttcomm error code is returned.
805 static int create_connect_relayd(struct lttng_uri
*uri
,
806 struct lttcomm_relayd_sock
**relayd_sock
,
807 struct consumer_output
*consumer
)
810 struct lttcomm_relayd_sock
*rsock
;
812 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
813 RELAYD_VERSION_COMM_MINOR
);
815 ret
= LTTNG_ERR_FATAL
;
820 * Connect to relayd so we can proceed with a session creation. This call
821 * can possibly block for an arbitrary amount of time to set the health
822 * state to be in poll execution.
825 ret
= relayd_connect(rsock
);
828 ERR("Unable to reach lttng-relayd");
829 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
833 /* Create socket for control stream. */
834 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
835 DBG3("Creating relayd stream socket from URI");
837 /* Check relayd version */
838 ret
= relayd_version_check(rsock
);
840 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
843 consumer
->relay_major_version
= rsock
->major
;
844 consumer
->relay_minor_version
= rsock
->minor
;
845 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
846 DBG3("Creating relayd data socket from URI");
848 /* Command is not valid */
849 ERR("Relayd invalid stream type: %d", uri
->stype
);
850 ret
= LTTNG_ERR_INVALID
;
854 *relayd_sock
= rsock
;
859 /* The returned value is not useful since we are on an error path. */
860 (void) relayd_close(rsock
);
868 * Connect to the relayd using URI and send the socket to the right consumer.
870 static int send_consumer_relayd_socket(enum lttng_domain_type domain
,
871 unsigned int session_id
, struct lttng_uri
*relayd_uri
,
872 struct consumer_output
*consumer
,
873 struct consumer_socket
*consumer_sock
,
874 char *session_name
, char *hostname
, int session_live_timer
)
877 struct lttcomm_relayd_sock
*rsock
= NULL
;
879 /* Connect to relayd and make version check if uri is the control. */
880 ret
= create_connect_relayd(relayd_uri
, &rsock
, consumer
);
881 if (ret
!= LTTNG_OK
) {
886 /* Set the network sequence index if not set. */
887 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
888 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
890 * Increment net_seq_idx because we are about to transfer the
891 * new relayd socket to the consumer.
892 * Assign unique key so the consumer can match streams.
894 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
895 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
898 /* Send relayd socket to consumer. */
899 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
900 relayd_uri
->stype
, session_id
,
901 session_name
, hostname
, session_live_timer
);
903 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
907 /* Flag that the corresponding socket was sent. */
908 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
909 consumer_sock
->control_sock_sent
= 1;
910 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
911 consumer_sock
->data_sock_sent
= 1;
917 * Close socket which was dup on the consumer side. The session daemon does
918 * NOT keep track of the relayd socket(s) once transfer to the consumer.
922 (void) relayd_close(rsock
);
926 if (ret
!= LTTNG_OK
) {
928 * The consumer output for this session should not be used anymore
929 * since the relayd connection failed thus making any tracing or/and
930 * streaming not usable.
932 consumer
->enabled
= 0;
938 * Send both relayd sockets to a specific consumer and domain. This is a
939 * helper function to facilitate sending the information to the consumer for a
942 static int send_consumer_relayd_sockets(enum lttng_domain_type domain
,
943 unsigned int session_id
, struct consumer_output
*consumer
,
944 struct consumer_socket
*sock
, char *session_name
,
945 char *hostname
, int session_live_timer
)
952 /* Sending control relayd socket. */
953 if (!sock
->control_sock_sent
) {
954 ret
= send_consumer_relayd_socket(domain
, session_id
,
955 &consumer
->dst
.net
.control
, consumer
, sock
,
956 session_name
, hostname
, session_live_timer
);
957 if (ret
!= LTTNG_OK
) {
962 /* Sending data relayd socket. */
963 if (!sock
->data_sock_sent
) {
964 ret
= send_consumer_relayd_socket(domain
, session_id
,
965 &consumer
->dst
.net
.data
, consumer
, sock
,
966 session_name
, hostname
, session_live_timer
);
967 if (ret
!= LTTNG_OK
) {
977 * Setup relayd connections for a tracing session. First creates the socket to
978 * the relayd and send them to the right domain consumer. Consumer type MUST be
981 int cmd_setup_relayd(struct ltt_session
*session
)
984 struct ltt_ust_session
*usess
;
985 struct ltt_kernel_session
*ksess
;
986 struct consumer_socket
*socket
;
987 struct lttng_ht_iter iter
;
991 usess
= session
->ust_session
;
992 ksess
= session
->kernel_session
;
994 DBG("Setting relayd for session %s", session
->name
);
998 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
999 && usess
->consumer
->enabled
) {
1000 /* For each consumer socket, send relayd sockets */
1001 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
1002 socket
, node
.node
) {
1003 pthread_mutex_lock(socket
->lock
);
1004 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
->id
,
1005 usess
->consumer
, socket
,
1006 session
->name
, session
->hostname
,
1007 session
->live_timer
);
1008 pthread_mutex_unlock(socket
->lock
);
1009 if (ret
!= LTTNG_OK
) {
1012 /* Session is now ready for network streaming. */
1013 session
->net_handle
= 1;
1015 session
->consumer
->relay_major_version
=
1016 usess
->consumer
->relay_major_version
;
1017 session
->consumer
->relay_minor_version
=
1018 usess
->consumer
->relay_minor_version
;
1021 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
1022 && ksess
->consumer
->enabled
) {
1023 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
1024 socket
, node
.node
) {
1025 pthread_mutex_lock(socket
->lock
);
1026 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
->id
,
1027 ksess
->consumer
, socket
,
1028 session
->name
, session
->hostname
,
1029 session
->live_timer
);
1030 pthread_mutex_unlock(socket
->lock
);
1031 if (ret
!= LTTNG_OK
) {
1034 /* Session is now ready for network streaming. */
1035 session
->net_handle
= 1;
1037 session
->consumer
->relay_major_version
=
1038 ksess
->consumer
->relay_major_version
;
1039 session
->consumer
->relay_minor_version
=
1040 ksess
->consumer
->relay_minor_version
;
1049 * Start a kernel session by opening all necessary streams.
1051 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
1054 struct ltt_kernel_channel
*kchan
;
1056 /* Open kernel metadata */
1057 if (ksess
->metadata
== NULL
&& ksess
->output_traces
) {
1058 ret
= kernel_open_metadata(ksess
);
1060 ret
= LTTNG_ERR_KERN_META_FAIL
;
1065 /* Open kernel metadata stream */
1066 if (ksess
->metadata
&& ksess
->metadata_stream_fd
< 0) {
1067 ret
= kernel_open_metadata_stream(ksess
);
1069 ERR("Kernel create metadata stream failed");
1070 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1075 /* For each channel */
1076 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
1077 if (kchan
->stream_count
== 0) {
1078 ret
= kernel_open_channel_stream(kchan
);
1080 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1083 /* Update the stream global counter */
1084 ksess
->stream_count_global
+= ret
;
1088 /* Setup kernel consumer socket and send fds to it */
1089 ret
= init_kernel_tracing(ksess
);
1091 ret
= LTTNG_ERR_KERN_START_FAIL
;
1095 /* This start the kernel tracing */
1096 ret
= kernel_start_session(ksess
);
1098 ret
= LTTNG_ERR_KERN_START_FAIL
;
1102 /* Quiescent wait after starting trace */
1103 kernel_wait_quiescent(kernel_tracer_fd
);
1114 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1116 int cmd_disable_channel(struct ltt_session
*session
,
1117 enum lttng_domain_type domain
, char *channel_name
)
1120 struct ltt_ust_session
*usess
;
1122 usess
= session
->ust_session
;
1127 case LTTNG_DOMAIN_KERNEL
:
1129 ret
= channel_kernel_disable(session
->kernel_session
,
1131 if (ret
!= LTTNG_OK
) {
1135 kernel_wait_quiescent(kernel_tracer_fd
);
1138 case LTTNG_DOMAIN_UST
:
1140 struct ltt_ust_channel
*uchan
;
1141 struct lttng_ht
*chan_ht
;
1143 chan_ht
= usess
->domain_global
.channels
;
1145 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
1146 if (uchan
== NULL
) {
1147 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1151 ret
= channel_ust_disable(usess
, uchan
);
1152 if (ret
!= LTTNG_OK
) {
1158 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1170 * Command LTTNG_TRACK_PID processed by the client thread.
1172 * Called with session lock held.
1174 int cmd_track_pid(struct ltt_session
*session
, enum lttng_domain_type domain
,
1182 case LTTNG_DOMAIN_KERNEL
:
1184 struct ltt_kernel_session
*ksess
;
1186 ksess
= session
->kernel_session
;
1188 ret
= kernel_track_pid(ksess
, pid
);
1189 if (ret
!= LTTNG_OK
) {
1193 kernel_wait_quiescent(kernel_tracer_fd
);
1196 case LTTNG_DOMAIN_UST
:
1198 struct ltt_ust_session
*usess
;
1200 usess
= session
->ust_session
;
1202 ret
= trace_ust_track_pid(usess
, pid
);
1203 if (ret
!= LTTNG_OK
) {
1209 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1221 * Command LTTNG_UNTRACK_PID processed by the client thread.
1223 * Called with session lock held.
1225 int cmd_untrack_pid(struct ltt_session
*session
, enum lttng_domain_type domain
,
1233 case LTTNG_DOMAIN_KERNEL
:
1235 struct ltt_kernel_session
*ksess
;
1237 ksess
= session
->kernel_session
;
1239 ret
= kernel_untrack_pid(ksess
, pid
);
1240 if (ret
!= LTTNG_OK
) {
1244 kernel_wait_quiescent(kernel_tracer_fd
);
1247 case LTTNG_DOMAIN_UST
:
1249 struct ltt_ust_session
*usess
;
1251 usess
= session
->ust_session
;
1253 ret
= trace_ust_untrack_pid(usess
, pid
);
1254 if (ret
!= LTTNG_OK
) {
1260 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1272 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1274 * The wpipe arguments is used as a notifier for the kernel thread.
1276 int cmd_enable_channel(struct ltt_session
*session
,
1277 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
1280 struct ltt_ust_session
*usess
= session
->ust_session
;
1281 struct lttng_ht
*chan_ht
;
1288 len
= lttng_strnlen(attr
->name
, sizeof(attr
->name
));
1290 /* Validate channel name */
1291 if (attr
->name
[0] == '.' ||
1292 memchr(attr
->name
, '/', len
) != NULL
) {
1293 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1297 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
1302 * Don't try to enable a channel if the session has been started at
1303 * some point in time before. The tracer does not allow it.
1305 if (session
->has_been_started
) {
1306 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1311 * If the session is a live session, remove the switch timer, the
1312 * live timer does the same thing but sends also synchronisation
1313 * beacons for inactive streams.
1315 if (session
->live_timer
> 0) {
1316 attr
->attr
.live_timer_interval
= session
->live_timer
;
1317 attr
->attr
.switch_timer_interval
= 0;
1321 * The ringbuffer (both in user space and kernel) behave badly in overwrite
1322 * mode and with less than 2 subbuf so block it right away and send back an
1323 * invalid attribute error.
1325 if (attr
->attr
.overwrite
&& attr
->attr
.num_subbuf
< 2) {
1326 ret
= LTTNG_ERR_INVALID
;
1330 switch (domain
->type
) {
1331 case LTTNG_DOMAIN_KERNEL
:
1333 struct ltt_kernel_channel
*kchan
;
1335 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
1336 session
->kernel_session
);
1337 if (kchan
== NULL
) {
1338 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
1339 if (attr
->name
[0] != '\0') {
1340 session
->kernel_session
->has_non_default_channel
= 1;
1343 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
1346 if (ret
!= LTTNG_OK
) {
1350 kernel_wait_quiescent(kernel_tracer_fd
);
1353 case LTTNG_DOMAIN_UST
:
1354 case LTTNG_DOMAIN_JUL
:
1355 case LTTNG_DOMAIN_LOG4J
:
1356 case LTTNG_DOMAIN_PYTHON
:
1358 struct ltt_ust_channel
*uchan
;
1363 * Current agent implementation limitations force us to allow
1364 * only one channel at once in "agent" subdomains. Each
1365 * subdomain has a default channel name which must be strictly
1368 if (domain
->type
== LTTNG_DOMAIN_JUL
) {
1369 if (strncmp(attr
->name
, DEFAULT_JUL_CHANNEL_NAME
,
1370 LTTNG_SYMBOL_NAME_LEN
)) {
1371 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1374 } else if (domain
->type
== LTTNG_DOMAIN_LOG4J
) {
1375 if (strncmp(attr
->name
, DEFAULT_LOG4J_CHANNEL_NAME
,
1376 LTTNG_SYMBOL_NAME_LEN
)) {
1377 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1380 } else if (domain
->type
== LTTNG_DOMAIN_PYTHON
) {
1381 if (strncmp(attr
->name
, DEFAULT_PYTHON_CHANNEL_NAME
,
1382 LTTNG_SYMBOL_NAME_LEN
)) {
1383 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1388 chan_ht
= usess
->domain_global
.channels
;
1390 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
1391 if (uchan
== NULL
) {
1392 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
1393 if (attr
->name
[0] != '\0') {
1394 usess
->has_non_default_channel
= 1;
1397 ret
= channel_ust_enable(usess
, uchan
);
1402 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1413 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1415 int cmd_disable_event(struct ltt_session
*session
,
1416 enum lttng_domain_type domain
, char *channel_name
,
1417 struct lttng_event
*event
)
1422 DBG("Disable event command for event \'%s\'", event
->name
);
1424 event_name
= event
->name
;
1425 if (validate_event_name(event_name
)) {
1426 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1430 /* Error out on unhandled search criteria */
1431 if (event
->loglevel_type
|| event
->loglevel
!= -1 || event
->enabled
1432 || event
->pid
|| event
->filter
|| event
->exclusion
) {
1433 ret
= LTTNG_ERR_UNK
;
1440 case LTTNG_DOMAIN_KERNEL
:
1442 struct ltt_kernel_channel
*kchan
;
1443 struct ltt_kernel_session
*ksess
;
1445 ksess
= session
->kernel_session
;
1448 * If a non-default channel has been created in the
1449 * session, explicitely require that -c chan_name needs
1452 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1453 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1457 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1458 if (kchan
== NULL
) {
1459 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1463 switch (event
->type
) {
1464 case LTTNG_EVENT_ALL
:
1465 case LTTNG_EVENT_TRACEPOINT
:
1466 case LTTNG_EVENT_SYSCALL
:
1467 case LTTNG_EVENT_PROBE
:
1468 case LTTNG_EVENT_FUNCTION
:
1469 case LTTNG_EVENT_FUNCTION_ENTRY
:/* fall-through */
1470 if (event_name
[0] == '\0') {
1471 ret
= event_kernel_disable_event(kchan
,
1474 ret
= event_kernel_disable_event(kchan
,
1475 event_name
, event
->type
);
1477 if (ret
!= LTTNG_OK
) {
1482 ret
= LTTNG_ERR_UNK
;
1486 kernel_wait_quiescent(kernel_tracer_fd
);
1489 case LTTNG_DOMAIN_UST
:
1491 struct ltt_ust_channel
*uchan
;
1492 struct ltt_ust_session
*usess
;
1494 usess
= session
->ust_session
;
1496 if (validate_ust_event_name(event_name
)) {
1497 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1502 * If a non-default channel has been created in the
1503 * session, explicitly require that -c chan_name needs
1506 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1507 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1511 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1513 if (uchan
== NULL
) {
1514 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1518 switch (event
->type
) {
1519 case LTTNG_EVENT_ALL
:
1521 * An empty event name means that everything
1522 * should be disabled.
1524 if (event
->name
[0] == '\0') {
1525 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1527 ret
= event_ust_disable_tracepoint(usess
, uchan
,
1530 if (ret
!= LTTNG_OK
) {
1535 ret
= LTTNG_ERR_UNK
;
1539 DBG3("Disable UST event %s in channel %s completed", event_name
,
1543 case LTTNG_DOMAIN_LOG4J
:
1544 case LTTNG_DOMAIN_JUL
:
1545 case LTTNG_DOMAIN_PYTHON
:
1548 struct ltt_ust_session
*usess
= session
->ust_session
;
1552 switch (event
->type
) {
1553 case LTTNG_EVENT_ALL
:
1556 ret
= LTTNG_ERR_UNK
;
1560 agt
= trace_ust_find_agent(usess
, domain
);
1562 ret
= -LTTNG_ERR_UST_EVENT_NOT_FOUND
;
1566 * An empty event name means that everything
1567 * should be disabled.
1569 if (event
->name
[0] == '\0') {
1570 ret
= event_agent_disable_all(usess
, agt
);
1572 ret
= event_agent_disable(usess
, agt
, event_name
);
1574 if (ret
!= LTTNG_OK
) {
1581 ret
= LTTNG_ERR_UND
;
1594 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1596 int cmd_add_context(struct ltt_session
*session
, enum lttng_domain_type domain
,
1597 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1599 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1600 char *app_ctx_provider_name
= NULL
, *app_ctx_name
= NULL
;
1602 if (ctx
->ctx
== LTTNG_EVENT_CONTEXT_APP_CONTEXT
) {
1603 app_ctx_provider_name
= ctx
->u
.app_ctx
.provider_name
;
1604 app_ctx_name
= ctx
->u
.app_ctx
.ctx_name
;
1608 case LTTNG_DOMAIN_KERNEL
:
1609 assert(session
->kernel_session
);
1611 if (session
->kernel_session
->channel_count
== 0) {
1612 /* Create default channel */
1613 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1614 if (ret
!= LTTNG_OK
) {
1617 chan_kern_created
= 1;
1619 /* Add kernel context to kernel tracer */
1620 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1621 if (ret
!= LTTNG_OK
) {
1625 case LTTNG_DOMAIN_JUL
:
1626 case LTTNG_DOMAIN_LOG4J
:
1629 * Validate channel name.
1630 * If no channel name is given and the domain is JUL or LOG4J,
1631 * set it to the appropriate domain-specific channel name. If
1632 * a name is provided but does not match the expexted channel
1633 * name, return an error.
1635 if (domain
== LTTNG_DOMAIN_JUL
&& *channel_name
&&
1636 strcmp(channel_name
,
1637 DEFAULT_JUL_CHANNEL_NAME
)) {
1638 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1640 } else if (domain
== LTTNG_DOMAIN_LOG4J
&& *channel_name
&&
1641 strcmp(channel_name
,
1642 DEFAULT_LOG4J_CHANNEL_NAME
)) {
1643 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1646 /* break is _not_ missing here. */
1648 case LTTNG_DOMAIN_UST
:
1650 struct ltt_ust_session
*usess
= session
->ust_session
;
1651 unsigned int chan_count
;
1655 chan_count
= lttng_ht_get_count(usess
->domain_global
.channels
);
1656 if (chan_count
== 0) {
1657 struct lttng_channel
*attr
;
1658 /* Create default channel */
1659 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1661 ret
= LTTNG_ERR_FATAL
;
1665 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1666 if (ret
!= LTTNG_OK
) {
1671 chan_ust_created
= 1;
1674 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1675 free(app_ctx_provider_name
);
1677 app_ctx_name
= NULL
;
1678 app_ctx_provider_name
= NULL
;
1679 if (ret
!= LTTNG_OK
) {
1685 ret
= LTTNG_ERR_UND
;
1693 if (chan_kern_created
) {
1694 struct ltt_kernel_channel
*kchan
=
1695 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1696 session
->kernel_session
);
1697 /* Created previously, this should NOT fail. */
1699 kernel_destroy_channel(kchan
);
1702 if (chan_ust_created
) {
1703 struct ltt_ust_channel
*uchan
=
1704 trace_ust_find_channel_by_name(
1705 session
->ust_session
->domain_global
.channels
,
1706 DEFAULT_CHANNEL_NAME
);
1707 /* Created previously, this should NOT fail. */
1709 /* Remove from the channel list of the session. */
1710 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1712 trace_ust_destroy_channel(uchan
);
1715 free(app_ctx_provider_name
);
1720 static int validate_event_name(const char *name
)
1723 const char *c
= name
;
1724 const char *event_name_end
= c
+ LTTNG_SYMBOL_NAME_LEN
;
1725 bool null_terminated
= false;
1728 * Make sure that unescaped wildcards are only used as the last
1729 * character of the event name.
1731 while (c
< event_name_end
) {
1734 null_terminated
= true;
1740 if ((c
+ 1) < event_name_end
&& *(c
+ 1)) {
1741 /* Wildcard is not the last character */
1742 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1751 if (!ret
&& !null_terminated
) {
1752 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1757 static inline bool name_starts_with(const char *name
, const char *prefix
)
1759 const size_t max_cmp_len
= min(strlen(prefix
), LTTNG_SYMBOL_NAME_LEN
);
1761 return !strncmp(name
, prefix
, max_cmp_len
);
1764 /* Perform userspace-specific event name validation */
1765 static int validate_ust_event_name(const char *name
)
1775 * Check name against all internal UST event component namespaces used
1778 if (name_starts_with(name
, DEFAULT_JUL_EVENT_COMPONENT
) ||
1779 name_starts_with(name
, DEFAULT_LOG4J_EVENT_COMPONENT
) ||
1780 name_starts_with(name
, DEFAULT_PYTHON_EVENT_COMPONENT
)) {
1789 * Internal version of cmd_enable_event() with a supplemental
1790 * "internal_event" flag which is used to enable internal events which should
1791 * be hidden from clients. Such events are used in the agent implementation to
1792 * enable the events through which all "agent" events are funeled.
1794 static int _cmd_enable_event(struct ltt_session
*session
,
1795 struct lttng_domain
*domain
,
1796 char *channel_name
, struct lttng_event
*event
,
1797 char *filter_expression
,
1798 struct lttng_filter_bytecode
*filter
,
1799 struct lttng_event_exclusion
*exclusion
,
1800 int wpipe
, bool internal_event
)
1802 int ret
, channel_created
= 0;
1803 struct lttng_channel
*attr
;
1807 assert(channel_name
);
1809 /* If we have a filter, we must have its filter expression */
1810 assert(!(!!filter_expression
^ !!filter
));
1812 DBG("Enable event command for event \'%s\'", event
->name
);
1816 ret
= validate_event_name(event
->name
);
1821 switch (domain
->type
) {
1822 case LTTNG_DOMAIN_KERNEL
:
1824 struct ltt_kernel_channel
*kchan
;
1827 * If a non-default channel has been created in the
1828 * session, explicitely require that -c chan_name needs
1831 if (session
->kernel_session
->has_non_default_channel
1832 && channel_name
[0] == '\0') {
1833 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1837 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1838 session
->kernel_session
);
1839 if (kchan
== NULL
) {
1840 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1841 LTTNG_BUFFER_GLOBAL
);
1843 ret
= LTTNG_ERR_FATAL
;
1846 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1848 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1849 if (ret
!= LTTNG_OK
) {
1855 channel_created
= 1;
1858 /* Get the newly created kernel channel pointer */
1859 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1860 session
->kernel_session
);
1861 if (kchan
== NULL
) {
1862 /* This sould not happen... */
1863 ret
= LTTNG_ERR_FATAL
;
1867 switch (event
->type
) {
1868 case LTTNG_EVENT_ALL
:
1870 char *filter_expression_a
= NULL
;
1871 struct lttng_filter_bytecode
*filter_a
= NULL
;
1874 * We need to duplicate filter_expression and filter,
1875 * because ownership is passed to first enable
1878 if (filter_expression
) {
1879 filter_expression_a
= strdup(filter_expression
);
1880 if (!filter_expression_a
) {
1881 ret
= LTTNG_ERR_FATAL
;
1886 filter_a
= zmalloc(sizeof(*filter_a
) + filter
->len
);
1888 free(filter_expression_a
);
1889 ret
= LTTNG_ERR_FATAL
;
1892 memcpy(filter_a
, filter
, sizeof(*filter_a
) + filter
->len
);
1894 event
->type
= LTTNG_EVENT_TRACEPOINT
; /* Hack */
1895 ret
= event_kernel_enable_event(kchan
, event
,
1896 filter_expression
, filter
);
1897 /* We have passed ownership */
1898 filter_expression
= NULL
;
1900 if (ret
!= LTTNG_OK
) {
1901 if (channel_created
) {
1902 /* Let's not leak a useless channel. */
1903 kernel_destroy_channel(kchan
);
1905 free(filter_expression_a
);
1909 event
->type
= LTTNG_EVENT_SYSCALL
; /* Hack */
1910 ret
= event_kernel_enable_event(kchan
, event
,
1911 filter_expression_a
, filter_a
);
1912 /* We have passed ownership */
1913 filter_expression_a
= NULL
;
1915 if (ret
!= LTTNG_OK
) {
1920 case LTTNG_EVENT_PROBE
:
1921 case LTTNG_EVENT_FUNCTION
:
1922 case LTTNG_EVENT_FUNCTION_ENTRY
:
1923 case LTTNG_EVENT_TRACEPOINT
:
1924 ret
= event_kernel_enable_event(kchan
, event
,
1925 filter_expression
, filter
);
1926 /* We have passed ownership */
1927 filter_expression
= NULL
;
1929 if (ret
!= LTTNG_OK
) {
1930 if (channel_created
) {
1931 /* Let's not leak a useless channel. */
1932 kernel_destroy_channel(kchan
);
1937 case LTTNG_EVENT_SYSCALL
:
1938 ret
= event_kernel_enable_event(kchan
, event
,
1939 filter_expression
, filter
);
1940 /* We have passed ownership */
1941 filter_expression
= NULL
;
1943 if (ret
!= LTTNG_OK
) {
1948 ret
= LTTNG_ERR_UNK
;
1952 kernel_wait_quiescent(kernel_tracer_fd
);
1955 case LTTNG_DOMAIN_UST
:
1957 struct ltt_ust_channel
*uchan
;
1958 struct ltt_ust_session
*usess
= session
->ust_session
;
1963 * If a non-default channel has been created in the
1964 * session, explicitely require that -c chan_name needs
1967 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1968 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1972 /* Get channel from global UST domain */
1973 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1975 if (uchan
== NULL
) {
1976 /* Create default channel */
1977 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1978 usess
->buffer_type
);
1980 ret
= LTTNG_ERR_FATAL
;
1983 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1985 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1986 if (ret
!= LTTNG_OK
) {
1992 /* Get the newly created channel reference back */
1993 uchan
= trace_ust_find_channel_by_name(
1994 usess
->domain_global
.channels
, channel_name
);
1998 if (uchan
->domain
!= LTTNG_DOMAIN_UST
&& !internal_event
) {
2000 * Don't allow users to add UST events to channels which
2001 * are assigned to a userspace subdomain (JUL, Log4J,
2004 ret
= LTTNG_ERR_INVALID_CHANNEL_DOMAIN
;
2008 if (!internal_event
) {
2010 * Ensure the event name is not reserved for internal
2013 ret
= validate_ust_event_name(event
->name
);
2015 WARN("Userspace event name %s failed validation.",
2017 event
->name
: "NULL");
2018 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
2023 /* At this point, the session and channel exist on the tracer */
2024 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
,
2025 filter_expression
, filter
, exclusion
,
2027 /* We have passed ownership */
2028 filter_expression
= NULL
;
2031 if (ret
== LTTNG_ERR_UST_EVENT_ENABLED
) {
2032 goto already_enabled
;
2033 } else if (ret
!= LTTNG_OK
) {
2038 case LTTNG_DOMAIN_LOG4J
:
2039 case LTTNG_DOMAIN_JUL
:
2040 case LTTNG_DOMAIN_PYTHON
:
2042 const char *default_event_name
, *default_chan_name
;
2044 struct lttng_event uevent
;
2045 struct lttng_domain tmp_dom
;
2046 struct ltt_ust_session
*usess
= session
->ust_session
;
2050 agt
= trace_ust_find_agent(usess
, domain
->type
);
2052 agt
= agent_create(domain
->type
);
2054 ret
= LTTNG_ERR_NOMEM
;
2057 agent_add(agt
, usess
->agents
);
2060 /* Create the default tracepoint. */
2061 memset(&uevent
, 0, sizeof(uevent
));
2062 uevent
.type
= LTTNG_EVENT_TRACEPOINT
;
2063 uevent
.loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
2064 default_event_name
= event_get_default_agent_ust_name(
2066 if (!default_event_name
) {
2067 ret
= LTTNG_ERR_FATAL
;
2070 strncpy(uevent
.name
, default_event_name
, sizeof(uevent
.name
));
2071 uevent
.name
[sizeof(uevent
.name
) - 1] = '\0';
2074 * The domain type is changed because we are about to enable the
2075 * default channel and event for the JUL domain that are hardcoded.
2076 * This happens in the UST domain.
2078 memcpy(&tmp_dom
, domain
, sizeof(tmp_dom
));
2079 tmp_dom
.type
= LTTNG_DOMAIN_UST
;
2081 switch (domain
->type
) {
2082 case LTTNG_DOMAIN_LOG4J
:
2083 default_chan_name
= DEFAULT_LOG4J_CHANNEL_NAME
;
2085 case LTTNG_DOMAIN_JUL
:
2086 default_chan_name
= DEFAULT_JUL_CHANNEL_NAME
;
2088 case LTTNG_DOMAIN_PYTHON
:
2089 default_chan_name
= DEFAULT_PYTHON_CHANNEL_NAME
;
2092 /* The switch/case we are in makes this impossible */
2097 char *filter_expression_copy
= NULL
;
2098 struct lttng_filter_bytecode
*filter_copy
= NULL
;
2101 const size_t filter_size
= sizeof(
2102 struct lttng_filter_bytecode
)
2105 filter_copy
= zmalloc(filter_size
);
2107 ret
= LTTNG_ERR_NOMEM
;
2110 memcpy(filter_copy
, filter
, filter_size
);
2112 filter_expression_copy
=
2113 strdup(filter_expression
);
2114 if (!filter_expression
) {
2115 ret
= LTTNG_ERR_NOMEM
;
2118 if (!filter_expression_copy
|| !filter_copy
) {
2119 free(filter_expression_copy
);
2125 ret
= cmd_enable_event_internal(session
, &tmp_dom
,
2126 (char *) default_chan_name
,
2127 &uevent
, filter_expression_copy
,
2128 filter_copy
, NULL
, wpipe
);
2131 if (ret
== LTTNG_ERR_UST_EVENT_ENABLED
) {
2132 goto already_enabled
;
2133 } else if (ret
!= LTTNG_OK
) {
2137 /* The wild card * means that everything should be enabled. */
2138 if (strncmp(event
->name
, "*", 1) == 0 && strlen(event
->name
) == 1) {
2139 ret
= event_agent_enable_all(usess
, agt
, event
, filter
,
2142 ret
= event_agent_enable(usess
, agt
, event
, filter
,
2146 filter_expression
= NULL
;
2147 if (ret
!= LTTNG_OK
) {
2154 ret
= LTTNG_ERR_UND
;
2162 free(filter_expression
);
2170 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2171 * We own filter, exclusion, and filter_expression.
2173 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
2174 char *channel_name
, struct lttng_event
*event
,
2175 char *filter_expression
,
2176 struct lttng_filter_bytecode
*filter
,
2177 struct lttng_event_exclusion
*exclusion
,
2180 return _cmd_enable_event(session
, domain
, channel_name
, event
,
2181 filter_expression
, filter
, exclusion
, wpipe
, false);
2185 * Enable an event which is internal to LTTng. An internal should
2186 * never be made visible to clients and are immune to checks such as
2189 static int cmd_enable_event_internal(struct ltt_session
*session
,
2190 struct lttng_domain
*domain
,
2191 char *channel_name
, struct lttng_event
*event
,
2192 char *filter_expression
,
2193 struct lttng_filter_bytecode
*filter
,
2194 struct lttng_event_exclusion
*exclusion
,
2197 return _cmd_enable_event(session
, domain
, channel_name
, event
,
2198 filter_expression
, filter
, exclusion
, wpipe
, true);
2202 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2204 ssize_t
cmd_list_tracepoints(enum lttng_domain_type domain
,
2205 struct lttng_event
**events
)
2208 ssize_t nb_events
= 0;
2211 case LTTNG_DOMAIN_KERNEL
:
2212 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2213 if (nb_events
< 0) {
2214 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
2218 case LTTNG_DOMAIN_UST
:
2219 nb_events
= ust_app_list_events(events
);
2220 if (nb_events
< 0) {
2221 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2225 case LTTNG_DOMAIN_LOG4J
:
2226 case LTTNG_DOMAIN_JUL
:
2227 case LTTNG_DOMAIN_PYTHON
:
2228 nb_events
= agent_list_events(events
, domain
);
2229 if (nb_events
< 0) {
2230 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2235 ret
= LTTNG_ERR_UND
;
2242 /* Return negative value to differentiate return code */
2247 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2249 ssize_t
cmd_list_tracepoint_fields(enum lttng_domain_type domain
,
2250 struct lttng_event_field
**fields
)
2253 ssize_t nb_fields
= 0;
2256 case LTTNG_DOMAIN_UST
:
2257 nb_fields
= ust_app_list_event_fields(fields
);
2258 if (nb_fields
< 0) {
2259 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2263 case LTTNG_DOMAIN_KERNEL
:
2264 default: /* fall-through */
2265 ret
= LTTNG_ERR_UND
;
2272 /* Return negative value to differentiate return code */
2276 ssize_t
cmd_list_syscalls(struct lttng_event
**events
)
2278 return syscall_table_list(events
);
2282 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2284 * Called with session lock held.
2286 ssize_t
cmd_list_tracker_pids(struct ltt_session
*session
,
2287 enum lttng_domain_type domain
, int32_t **pids
)
2290 ssize_t nr_pids
= 0;
2293 case LTTNG_DOMAIN_KERNEL
:
2295 struct ltt_kernel_session
*ksess
;
2297 ksess
= session
->kernel_session
;
2298 nr_pids
= kernel_list_tracker_pids(ksess
, pids
);
2300 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
2305 case LTTNG_DOMAIN_UST
:
2307 struct ltt_ust_session
*usess
;
2309 usess
= session
->ust_session
;
2310 nr_pids
= trace_ust_list_tracker_pids(usess
, pids
);
2312 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2317 case LTTNG_DOMAIN_LOG4J
:
2318 case LTTNG_DOMAIN_JUL
:
2319 case LTTNG_DOMAIN_PYTHON
:
2321 ret
= LTTNG_ERR_UND
;
2328 /* Return negative value to differentiate return code */
2333 * Command LTTNG_START_TRACE processed by the client thread.
2335 * Called with session mutex held.
2337 int cmd_start_trace(struct ltt_session
*session
)
2340 unsigned long nb_chan
= 0;
2341 struct ltt_kernel_session
*ksession
;
2342 struct ltt_ust_session
*usess
;
2346 /* Ease our life a bit ;) */
2347 ksession
= session
->kernel_session
;
2348 usess
= session
->ust_session
;
2350 /* Is the session already started? */
2351 if (session
->active
) {
2352 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2357 * Starting a session without channel is useless since after that it's not
2358 * possible to enable channel thus inform the client.
2360 if (usess
&& usess
->domain_global
.channels
) {
2361 nb_chan
+= lttng_ht_get_count(usess
->domain_global
.channels
);
2364 nb_chan
+= ksession
->channel_count
;
2367 ret
= LTTNG_ERR_NO_CHANNEL
;
2371 /* Kernel tracing */
2372 if (ksession
!= NULL
) {
2373 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
2374 if (ret
!= LTTNG_OK
) {
2379 /* Flag session that trace should start automatically */
2382 * Even though the start trace might fail, flag this session active so
2383 * other application coming in are started by default.
2387 ret
= ust_app_start_trace_all(usess
);
2389 ret
= LTTNG_ERR_UST_START_FAIL
;
2394 /* Flag this after a successful start. */
2395 session
->has_been_started
= 1;
2396 session
->active
= 1;
2405 * Command LTTNG_STOP_TRACE processed by the client thread.
2407 int cmd_stop_trace(struct ltt_session
*session
)
2410 struct ltt_kernel_channel
*kchan
;
2411 struct ltt_kernel_session
*ksession
;
2412 struct ltt_ust_session
*usess
;
2417 ksession
= session
->kernel_session
;
2418 usess
= session
->ust_session
;
2420 /* Session is not active. Skip everythong and inform the client. */
2421 if (!session
->active
) {
2422 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
2427 if (ksession
&& ksession
->active
) {
2428 DBG("Stop kernel tracing");
2430 /* Flush metadata if exist */
2431 if (ksession
->metadata_stream_fd
>= 0) {
2432 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2434 ERR("Kernel metadata flush failed");
2438 /* Flush all buffers before stopping */
2439 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2440 ret
= kernel_flush_buffer(kchan
);
2442 ERR("Kernel flush buffer error");
2446 ret
= kernel_stop_session(ksession
);
2448 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
2452 kernel_wait_quiescent(kernel_tracer_fd
);
2454 ksession
->active
= 0;
2457 if (usess
&& usess
->active
) {
2459 * Even though the stop trace might fail, flag this session inactive so
2460 * other application coming in are not started by default.
2464 ret
= ust_app_stop_trace_all(usess
);
2466 ret
= LTTNG_ERR_UST_STOP_FAIL
;
2471 /* Flag inactive after a successful stop. */
2472 session
->active
= 0;
2480 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2482 int cmd_set_consumer_uri(struct ltt_session
*session
, size_t nb_uri
,
2483 struct lttng_uri
*uris
)
2486 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2487 struct ltt_ust_session
*usess
= session
->ust_session
;
2493 /* Can't set consumer URI if the session is active. */
2494 if (session
->active
) {
2495 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2499 /* Set the "global" consumer URIs */
2500 for (i
= 0; i
< nb_uri
; i
++) {
2501 ret
= add_uri_to_consumer(session
->consumer
,
2502 &uris
[i
], 0, session
->name
);
2503 if (ret
!= LTTNG_OK
) {
2508 /* Set UST session URIs */
2509 if (session
->ust_session
) {
2510 for (i
= 0; i
< nb_uri
; i
++) {
2511 ret
= add_uri_to_consumer(
2512 session
->ust_session
->consumer
,
2513 &uris
[i
], LTTNG_DOMAIN_UST
,
2515 if (ret
!= LTTNG_OK
) {
2521 /* Set kernel session URIs */
2522 if (session
->kernel_session
) {
2523 for (i
= 0; i
< nb_uri
; i
++) {
2524 ret
= add_uri_to_consumer(
2525 session
->kernel_session
->consumer
,
2526 &uris
[i
], LTTNG_DOMAIN_KERNEL
,
2528 if (ret
!= LTTNG_OK
) {
2535 * Make sure to set the session in output mode after we set URI since a
2536 * session can be created without URL (thus flagged in no output mode).
2538 session
->output_traces
= 1;
2540 ksess
->output_traces
= 1;
2544 usess
->output_traces
= 1;
2555 * Command LTTNG_CREATE_SESSION processed by the client thread.
2557 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
2558 size_t nb_uri
, lttng_sock_cred
*creds
, unsigned int live_timer
)
2561 struct ltt_session
*session
;
2567 * Verify if the session already exist
2569 * XXX: There is no need for the session lock list here since the caller
2570 * (process_client_msg) is holding it. We might want to change that so a
2571 * single command does not lock the entire session list.
2573 session
= session_find_by_name(name
);
2574 if (session
!= NULL
) {
2575 ret
= LTTNG_ERR_EXIST_SESS
;
2579 /* Create tracing session in the registry */
2580 ret
= session_create(name
, LTTNG_SOCK_GET_UID_CRED(creds
),
2581 LTTNG_SOCK_GET_GID_CRED(creds
));
2582 if (ret
!= LTTNG_OK
) {
2587 * Get the newly created session pointer back
2589 * XXX: There is no need for the session lock list here since the caller
2590 * (process_client_msg) is holding it. We might want to change that so a
2591 * single command does not lock the entire session list.
2593 session
= session_find_by_name(name
);
2596 session
->live_timer
= live_timer
;
2597 /* Create default consumer output for the session not yet created. */
2598 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
2599 if (session
->consumer
== NULL
) {
2600 ret
= LTTNG_ERR_FATAL
;
2601 goto consumer_error
;
2605 ret
= cmd_set_consumer_uri(session
, nb_uri
, uris
);
2606 if (ret
!= LTTNG_OK
) {
2607 goto consumer_error
;
2609 session
->output_traces
= 1;
2611 session
->output_traces
= 0;
2612 DBG2("Session %s created with no output", session
->name
);
2615 session
->consumer
->enabled
= 1;
2620 session_destroy(session
);
2627 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2629 int cmd_create_session_snapshot(char *name
, struct lttng_uri
*uris
,
2630 size_t nb_uri
, lttng_sock_cred
*creds
)
2633 struct ltt_session
*session
;
2634 struct snapshot_output
*new_output
= NULL
;
2640 * Create session in no output mode with URIs set to NULL. The uris we've
2641 * received are for a default snapshot output if one.
2643 ret
= cmd_create_session_uri(name
, NULL
, 0, creds
, 0);
2644 if (ret
!= LTTNG_OK
) {
2648 /* Get the newly created session pointer back. This should NEVER fail. */
2649 session
= session_find_by_name(name
);
2652 /* Flag session for snapshot mode. */
2653 session
->snapshot_mode
= 1;
2655 /* Skip snapshot output creation if no URI is given. */
2660 new_output
= snapshot_output_alloc();
2662 ret
= LTTNG_ERR_NOMEM
;
2663 goto error_snapshot_alloc
;
2666 ret
= snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE
, NULL
,
2667 uris
, nb_uri
, session
->consumer
, new_output
, &session
->snapshot
);
2669 if (ret
== -ENOMEM
) {
2670 ret
= LTTNG_ERR_NOMEM
;
2672 ret
= LTTNG_ERR_INVALID
;
2674 goto error_snapshot
;
2678 snapshot_add_output(&session
->snapshot
, new_output
);
2685 snapshot_output_destroy(new_output
);
2686 error_snapshot_alloc
:
2687 session_destroy(session
);
2693 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2695 * Called with session lock held.
2697 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
2700 struct ltt_ust_session
*usess
;
2701 struct ltt_kernel_session
*ksess
;
2706 usess
= session
->ust_session
;
2707 ksess
= session
->kernel_session
;
2709 /* Clean kernel session teardown */
2710 kernel_destroy_session(ksess
);
2712 /* UST session teardown */
2714 /* Close any relayd session */
2715 consumer_output_send_destroy_relayd(usess
->consumer
);
2717 /* Destroy every UST application related to this session. */
2718 ret
= ust_app_destroy_trace_all(usess
);
2720 ERR("Error in ust_app_destroy_trace_all");
2723 /* Clean up the rest. */
2724 trace_ust_destroy_session(usess
);
2728 * Must notify the kernel thread here to update it's poll set in order to
2729 * remove the channel(s)' fd just destroyed.
2731 ret
= notify_thread_pipe(wpipe
);
2733 PERROR("write kernel poll pipe");
2736 ret
= session_destroy(session
);
2742 * Command LTTNG_CALIBRATE processed by the client thread.
2744 int cmd_calibrate(enum lttng_domain_type domain
,
2745 struct lttng_calibrate
*calibrate
)
2750 case LTTNG_DOMAIN_KERNEL
:
2752 struct lttng_kernel_calibrate kcalibrate
;
2754 switch (calibrate
->type
) {
2755 case LTTNG_CALIBRATE_FUNCTION
:
2757 /* Default and only possible calibrate option. */
2758 kcalibrate
.type
= LTTNG_KERNEL_CALIBRATE_KRETPROBE
;
2762 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2764 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
2769 case LTTNG_DOMAIN_UST
:
2771 struct lttng_ust_calibrate ucalibrate
;
2773 switch (calibrate
->type
) {
2774 case LTTNG_CALIBRATE_FUNCTION
:
2776 /* Default and only possible calibrate option. */
2777 ucalibrate
.type
= LTTNG_UST_CALIBRATE_TRACEPOINT
;
2781 ret
= ust_app_calibrate_glb(&ucalibrate
);
2783 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
2789 ret
= LTTNG_ERR_UND
;
2800 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2802 int cmd_register_consumer(struct ltt_session
*session
,
2803 enum lttng_domain_type domain
, const char *sock_path
,
2804 struct consumer_data
*cdata
)
2807 struct consumer_socket
*socket
= NULL
;
2814 case LTTNG_DOMAIN_KERNEL
:
2816 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2820 /* Can't register a consumer if there is already one */
2821 if (ksess
->consumer_fds_sent
!= 0) {
2822 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2826 sock
= lttcomm_connect_unix_sock(sock_path
);
2828 ret
= LTTNG_ERR_CONNECT_FAIL
;
2831 cdata
->cmd_sock
= sock
;
2833 socket
= consumer_allocate_socket(&cdata
->cmd_sock
);
2834 if (socket
== NULL
) {
2837 PERROR("close register consumer");
2839 cdata
->cmd_sock
= -1;
2840 ret
= LTTNG_ERR_FATAL
;
2844 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
2845 if (socket
->lock
== NULL
) {
2846 PERROR("zmalloc pthread mutex");
2847 ret
= LTTNG_ERR_FATAL
;
2850 pthread_mutex_init(socket
->lock
, NULL
);
2851 socket
->registered
= 1;
2854 consumer_add_socket(socket
, ksess
->consumer
);
2857 pthread_mutex_lock(&cdata
->pid_mutex
);
2859 pthread_mutex_unlock(&cdata
->pid_mutex
);
2864 /* TODO: Userspace tracing */
2865 ret
= LTTNG_ERR_UND
;
2873 consumer_destroy_socket(socket
);
2879 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2881 ssize_t
cmd_list_domains(struct ltt_session
*session
,
2882 struct lttng_domain
**domains
)
2887 struct lttng_ht_iter iter
;
2889 if (session
->kernel_session
!= NULL
) {
2890 DBG3("Listing domains found kernel domain");
2894 if (session
->ust_session
!= NULL
) {
2895 DBG3("Listing domains found UST global domain");
2899 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
2901 if (agt
->being_used
) {
2912 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2913 if (*domains
== NULL
) {
2914 ret
= LTTNG_ERR_FATAL
;
2918 if (session
->kernel_session
!= NULL
) {
2919 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2921 /* Kernel session buffer type is always GLOBAL */
2922 (*domains
)[index
].buf_type
= LTTNG_BUFFER_GLOBAL
;
2927 if (session
->ust_session
!= NULL
) {
2928 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2929 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2933 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
2935 if (agt
->being_used
) {
2936 (*domains
)[index
].type
= agt
->domain
;
2937 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2947 /* Return negative value to differentiate return code */
2953 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2955 ssize_t
cmd_list_channels(enum lttng_domain_type domain
,
2956 struct ltt_session
*session
, struct lttng_channel
**channels
)
2958 ssize_t nb_chan
= 0, payload_size
= 0, ret
;
2961 case LTTNG_DOMAIN_KERNEL
:
2962 if (session
->kernel_session
!= NULL
) {
2963 nb_chan
= session
->kernel_session
->channel_count
;
2965 DBG3("Number of kernel channels %zd", nb_chan
);
2967 ret
= -LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2971 case LTTNG_DOMAIN_UST
:
2972 if (session
->ust_session
!= NULL
) {
2974 nb_chan
= lttng_ht_get_count(
2975 session
->ust_session
->domain_global
.channels
);
2978 DBG3("Number of UST global channels %zd", nb_chan
);
2980 ret
= -LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2985 ret
= -LTTNG_ERR_UND
;
2990 const size_t channel_size
= sizeof(struct lttng_channel
) +
2991 sizeof(struct lttcomm_channel_extended
);
2992 struct lttcomm_channel_extended
*channel_exts
;
2994 payload_size
= nb_chan
* channel_size
;
2995 *channels
= zmalloc(payload_size
);
2996 if (*channels
== NULL
) {
2997 ret
= -LTTNG_ERR_FATAL
;
3001 channel_exts
= ((void *) *channels
) +
3002 (nb_chan
* sizeof(struct lttng_channel
));
3003 list_lttng_channels(domain
, session
, *channels
, channel_exts
);
3014 * Command LTTNG_LIST_EVENTS processed by the client thread.
3016 ssize_t
cmd_list_events(enum lttng_domain_type domain
,
3017 struct ltt_session
*session
, char *channel_name
,
3018 struct lttng_event
**events
, size_t *total_size
)
3021 ssize_t nb_event
= 0;
3024 case LTTNG_DOMAIN_KERNEL
:
3025 if (session
->kernel_session
!= NULL
) {
3026 nb_event
= list_lttng_kernel_events(channel_name
,
3027 session
->kernel_session
, events
,
3031 case LTTNG_DOMAIN_UST
:
3033 if (session
->ust_session
!= NULL
) {
3034 nb_event
= list_lttng_ust_global_events(channel_name
,
3035 &session
->ust_session
->domain_global
, events
,
3040 case LTTNG_DOMAIN_LOG4J
:
3041 case LTTNG_DOMAIN_JUL
:
3042 case LTTNG_DOMAIN_PYTHON
:
3043 if (session
->ust_session
) {
3044 struct lttng_ht_iter iter
;
3048 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
,
3049 &iter
.iter
, agt
, node
.node
) {
3050 if (agt
->domain
== domain
) {
3051 nb_event
= list_lttng_agent_events(
3061 ret
= LTTNG_ERR_UND
;
3068 /* Return negative value to differentiate return code */
3073 * Using the session list, filled a lttng_session array to send back to the
3074 * client for session listing.
3076 * The session list lock MUST be acquired before calling this function. Use
3077 * session_lock_list() and session_unlock_list().
3079 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
3084 struct ltt_session
*session
;
3085 struct ltt_session_list
*list
= session_get_list();
3087 DBG("Getting all available session for UID %d GID %d",
3090 * Iterate over session list and append data after the control struct in
3093 cds_list_for_each_entry(session
, &list
->head
, list
) {
3095 * Only list the sessions the user can control.
3097 if (!session_access_ok(session
, uid
, gid
)) {
3101 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3102 struct ltt_ust_session
*usess
= session
->ust_session
;
3104 if (session
->consumer
->type
== CONSUMER_DST_NET
||
3105 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
3106 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
3107 ret
= build_network_session_path(sessions
[i
].path
,
3108 sizeof(sessions
[i
].path
), session
);
3110 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
3111 session
->consumer
->dst
.trace_path
);
3114 PERROR("snprintf session path");
3118 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
3119 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
3120 sessions
[i
].enabled
= session
->active
;
3121 sessions
[i
].snapshot_mode
= session
->snapshot_mode
;
3122 sessions
[i
].live_timer_interval
= session
->live_timer
;
3128 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
3129 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
3131 int cmd_data_pending(struct ltt_session
*session
)
3134 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3135 struct ltt_ust_session
*usess
= session
->ust_session
;
3139 /* Session MUST be stopped to ask for data availability. */
3140 if (session
->active
) {
3141 ret
= LTTNG_ERR_SESSION_STARTED
;
3145 * If stopped, just make sure we've started before else the above call
3146 * will always send that there is data pending.
3148 * The consumer assumes that when the data pending command is received,
3149 * the trace has been started before or else no output data is written
3150 * by the streams which is a condition for data pending. So, this is
3151 * *VERY* important that we don't ask the consumer before a start
3154 if (!session
->has_been_started
) {
3160 if (ksess
&& ksess
->consumer
) {
3161 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
3163 /* Data is still being extracted for the kernel. */
3168 if (usess
&& usess
->consumer
) {
3169 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
3171 /* Data is still being extracted for the kernel. */
3176 /* Data is ready to be read by a viewer */
3184 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
3186 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3188 int cmd_snapshot_add_output(struct ltt_session
*session
,
3189 struct lttng_snapshot_output
*output
, uint32_t *id
)
3192 struct snapshot_output
*new_output
;
3197 DBG("Cmd snapshot add output for session %s", session
->name
);
3200 * Permission denied to create an output if the session is not
3201 * set in no output mode.
3203 if (session
->output_traces
) {
3204 ret
= LTTNG_ERR_EPERM
;
3208 /* Only one output is allowed until we have the "tee" feature. */
3209 if (session
->snapshot
.nb_output
== 1) {
3210 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
3214 new_output
= snapshot_output_alloc();
3216 ret
= LTTNG_ERR_NOMEM
;
3220 ret
= snapshot_output_init(output
->max_size
, output
->name
,
3221 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
3222 &session
->snapshot
);
3224 if (ret
== -ENOMEM
) {
3225 ret
= LTTNG_ERR_NOMEM
;
3227 ret
= LTTNG_ERR_INVALID
;
3233 snapshot_add_output(&session
->snapshot
, new_output
);
3235 *id
= new_output
->id
;
3242 snapshot_output_destroy(new_output
);
3248 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
3250 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3252 int cmd_snapshot_del_output(struct ltt_session
*session
,
3253 struct lttng_snapshot_output
*output
)
3256 struct snapshot_output
*sout
= NULL
;
3264 * Permission denied to create an output if the session is not
3265 * set in no output mode.
3267 if (session
->output_traces
) {
3268 ret
= LTTNG_ERR_EPERM
;
3273 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
3275 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
3276 } else if (*output
->name
!= '\0') {
3277 DBG("Cmd snapshot del output name %s for session %s", output
->name
,
3279 sout
= snapshot_find_output_by_name(output
->name
, &session
->snapshot
);
3282 ret
= LTTNG_ERR_INVALID
;
3286 snapshot_delete_output(&session
->snapshot
, sout
);
3287 snapshot_output_destroy(sout
);
3296 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
3298 * If no output is available, outputs is untouched and 0 is returned.
3300 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
3302 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
3303 struct lttng_snapshot_output
**outputs
)
3306 struct lttng_snapshot_output
*list
= NULL
;
3307 struct lttng_ht_iter iter
;
3308 struct snapshot_output
*output
;
3313 DBG("Cmd snapshot list outputs for session %s", session
->name
);
3316 * Permission denied to create an output if the session is not
3317 * set in no output mode.
3319 if (session
->output_traces
) {
3320 ret
= -LTTNG_ERR_EPERM
;
3324 if (session
->snapshot
.nb_output
== 0) {
3329 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
3331 ret
= -LTTNG_ERR_NOMEM
;
3335 /* Copy list from session to the new list object. */
3337 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
3338 output
, node
.node
) {
3339 assert(output
->consumer
);
3340 list
[idx
].id
= output
->id
;
3341 list
[idx
].max_size
= output
->max_size
;
3342 strncpy(list
[idx
].name
, output
->name
, sizeof(list
[idx
].name
));
3343 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
3344 strncpy(list
[idx
].ctrl_url
, output
->consumer
->dst
.trace_path
,
3345 sizeof(list
[idx
].ctrl_url
));
3348 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
3349 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
3351 ret
= -LTTNG_ERR_NOMEM
;
3356 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
3357 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
3359 ret
= -LTTNG_ERR_NOMEM
;
3368 ret
= session
->snapshot
.nb_output
;
3376 * Send relayd sockets from snapshot output to consumer. Ignore request if the
3377 * snapshot output is *not* set with a remote destination.
3379 * Return 0 on success or a LTTNG_ERR code.
3381 static int set_relayd_for_snapshot(struct consumer_output
*consumer
,
3382 struct snapshot_output
*snap_output
, struct ltt_session
*session
)
3385 struct lttng_ht_iter iter
;
3386 struct consumer_socket
*socket
;
3389 assert(snap_output
);
3392 DBG2("Set relayd object from snapshot output");
3394 /* Ignore if snapshot consumer output is not network. */
3395 if (snap_output
->consumer
->type
!= CONSUMER_DST_NET
) {
3400 * For each consumer socket, create and send the relayd object of the
3404 cds_lfht_for_each_entry(snap_output
->consumer
->socks
->ht
, &iter
.iter
,
3405 socket
, node
.node
) {
3406 ret
= send_consumer_relayd_sockets(0, session
->id
,
3407 snap_output
->consumer
, socket
,
3408 session
->name
, session
->hostname
,
3409 session
->live_timer
);
3410 if (ret
!= LTTNG_OK
) {
3422 * Record a kernel snapshot.
3424 * Return LTTNG_OK on success or a LTTNG_ERR code.
3426 static int record_kernel_snapshot(struct ltt_kernel_session
*ksess
,
3427 struct snapshot_output
*output
, struct ltt_session
*session
,
3428 int wait
, uint64_t nb_packets_per_stream
)
3436 /* Get the datetime for the snapshot output directory. */
3437 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
3438 sizeof(output
->datetime
));
3440 ret
= LTTNG_ERR_INVALID
;
3445 * Copy kernel session sockets so we can communicate with the right
3446 * consumer for the snapshot record command.
3448 ret
= consumer_copy_sockets(output
->consumer
, ksess
->consumer
);
3450 ret
= LTTNG_ERR_NOMEM
;
3454 ret
= set_relayd_for_snapshot(ksess
->consumer
, output
, session
);
3455 if (ret
!= LTTNG_OK
) {
3456 goto error_snapshot
;
3459 ret
= kernel_snapshot_record(ksess
, output
, wait
, nb_packets_per_stream
);
3460 if (ret
!= LTTNG_OK
) {
3461 goto error_snapshot
;
3468 /* Clean up copied sockets so this output can use some other later on. */
3469 consumer_destroy_output_sockets(output
->consumer
);
3476 * Record a UST snapshot.
3478 * Return 0 on success or a LTTNG_ERR error code.
3480 static int record_ust_snapshot(struct ltt_ust_session
*usess
,
3481 struct snapshot_output
*output
, struct ltt_session
*session
,
3482 int wait
, uint64_t nb_packets_per_stream
)
3490 /* Get the datetime for the snapshot output directory. */
3491 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", output
->datetime
,
3492 sizeof(output
->datetime
));
3494 ret
= LTTNG_ERR_INVALID
;
3499 * Copy UST session sockets so we can communicate with the right
3500 * consumer for the snapshot record command.
3502 ret
= consumer_copy_sockets(output
->consumer
, usess
->consumer
);
3504 ret
= LTTNG_ERR_NOMEM
;
3508 ret
= set_relayd_for_snapshot(usess
->consumer
, output
, session
);
3509 if (ret
!= LTTNG_OK
) {
3510 goto error_snapshot
;
3513 ret
= ust_app_snapshot_record(usess
, output
, wait
, nb_packets_per_stream
);
3517 ret
= LTTNG_ERR_INVALID
;
3520 ret
= LTTNG_ERR_SNAPSHOT_NODATA
;
3523 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
3526 goto error_snapshot
;
3532 /* Clean up copied sockets so this output can use some other later on. */
3533 consumer_destroy_output_sockets(output
->consumer
);
3539 uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session
*session
,
3540 uint64_t cur_nr_packets
)
3542 uint64_t tot_size
= 0;
3544 if (session
->kernel_session
) {
3545 struct ltt_kernel_channel
*chan
;
3546 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3548 cds_list_for_each_entry(chan
, &ksess
->channel_list
.head
, list
) {
3549 if (cur_nr_packets
>= chan
->channel
->attr
.num_subbuf
) {
3551 * Don't take channel into account if we
3552 * already grab all its packets.
3556 tot_size
+= chan
->channel
->attr
.subbuf_size
3557 * chan
->stream_count
;
3561 if (session
->ust_session
) {
3562 struct ltt_ust_session
*usess
= session
->ust_session
;
3564 tot_size
+= ust_app_get_size_one_more_packet_per_stream(usess
,
3572 * Calculate the number of packets we can grab from each stream that
3573 * fits within the overall snapshot max size.
3575 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
3576 * the number of packets per stream.
3578 * TODO: this approach is not perfect: we consider the worse case
3579 * (packet filling the sub-buffers) as an upper bound, but we could do
3580 * better if we do this calculation while we actually grab the packet
3581 * content: we would know how much padding we don't actually store into
3584 * This algorithm is currently bounded by the number of packets per
3587 * Since we call this algorithm before actually grabbing the data, it's
3588 * an approximation: for instance, applications could appear/disappear
3589 * in between this call and actually grabbing data.
3592 int64_t get_session_nb_packets_per_stream(struct ltt_session
*session
, uint64_t max_size
)
3595 uint64_t cur_nb_packets
= 0;
3598 return 0; /* Infinite */
3601 size_left
= max_size
;
3603 uint64_t one_more_packet_tot_size
;
3605 one_more_packet_tot_size
= get_session_size_one_more_packet_per_stream(session
,
3607 if (!one_more_packet_tot_size
) {
3608 /* We are already grabbing all packets. */
3611 size_left
-= one_more_packet_tot_size
;
3612 if (size_left
< 0) {
3617 if (!cur_nb_packets
) {
3618 /* Not enough room to grab one packet of each stream, error. */
3621 return cur_nb_packets
;
3625 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3627 * The wait parameter is ignored so this call always wait for the snapshot to
3628 * complete before returning.
3630 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3632 int cmd_snapshot_record(struct ltt_session
*session
,
3633 struct lttng_snapshot_output
*output
, int wait
)
3636 unsigned int use_tmp_output
= 0;
3637 struct snapshot_output tmp_output
;
3638 unsigned int snapshot_success
= 0;
3643 DBG("Cmd snapshot record for session %s", session
->name
);
3646 * Permission denied to create an output if the session is not
3647 * set in no output mode.
3649 if (session
->output_traces
) {
3650 ret
= LTTNG_ERR_EPERM
;
3654 /* The session needs to be started at least once. */
3655 if (!session
->has_been_started
) {
3656 ret
= LTTNG_ERR_START_SESSION_ONCE
;
3660 /* Use temporary output for the session. */
3661 if (*output
->ctrl_url
!= '\0') {
3662 ret
= snapshot_output_init(output
->max_size
, output
->name
,
3663 output
->ctrl_url
, output
->data_url
, session
->consumer
,
3666 if (ret
== -ENOMEM
) {
3667 ret
= LTTNG_ERR_NOMEM
;
3669 ret
= LTTNG_ERR_INVALID
;
3673 /* Use the global session count for the temporary snapshot. */
3674 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3678 if (session
->kernel_session
) {
3679 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3681 if (use_tmp_output
) {
3682 int64_t nb_packets_per_stream
;
3684 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
3685 tmp_output
.max_size
);
3686 if (nb_packets_per_stream
< 0) {
3687 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3690 ret
= record_kernel_snapshot(ksess
, &tmp_output
, session
,
3691 wait
, nb_packets_per_stream
);
3692 if (ret
!= LTTNG_OK
) {
3695 snapshot_success
= 1;
3697 struct snapshot_output
*sout
;
3698 struct lttng_ht_iter iter
;
3701 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
3702 &iter
.iter
, sout
, node
.node
) {
3703 int64_t nb_packets_per_stream
;
3706 * Make a local copy of the output and assign the possible
3707 * temporary value given by the caller.
3709 memset(&tmp_output
, 0, sizeof(tmp_output
));
3710 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
3712 if (output
->max_size
!= (uint64_t) -1ULL) {
3713 tmp_output
.max_size
= output
->max_size
;
3716 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
3717 tmp_output
.max_size
);
3718 if (nb_packets_per_stream
< 0) {
3719 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3723 /* Use temporary name. */
3724 if (*output
->name
!= '\0') {
3725 strncpy(tmp_output
.name
, output
->name
,
3726 sizeof(tmp_output
.name
));
3729 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3731 ret
= record_kernel_snapshot(ksess
, &tmp_output
,
3732 session
, wait
, nb_packets_per_stream
);
3733 if (ret
!= LTTNG_OK
) {
3737 snapshot_success
= 1;
3743 if (session
->ust_session
) {
3744 struct ltt_ust_session
*usess
= session
->ust_session
;
3746 if (use_tmp_output
) {
3747 int64_t nb_packets_per_stream
;
3749 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
3750 tmp_output
.max_size
);
3751 if (nb_packets_per_stream
< 0) {
3752 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3755 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
3756 wait
, nb_packets_per_stream
);
3757 if (ret
!= LTTNG_OK
) {
3760 snapshot_success
= 1;
3762 struct snapshot_output
*sout
;
3763 struct lttng_ht_iter iter
;
3766 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
3767 &iter
.iter
, sout
, node
.node
) {
3768 int64_t nb_packets_per_stream
;
3771 * Make a local copy of the output and assign the possible
3772 * temporary value given by the caller.
3774 memset(&tmp_output
, 0, sizeof(tmp_output
));
3775 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
3777 if (output
->max_size
!= (uint64_t) -1ULL) {
3778 tmp_output
.max_size
= output
->max_size
;
3781 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
3782 tmp_output
.max_size
);
3783 if (nb_packets_per_stream
< 0) {
3784 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3789 /* Use temporary name. */
3790 if (*output
->name
!= '\0') {
3791 strncpy(tmp_output
.name
, output
->name
,
3792 sizeof(tmp_output
.name
));
3795 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3797 ret
= record_ust_snapshot(usess
, &tmp_output
, session
,
3798 wait
, nb_packets_per_stream
);
3799 if (ret
!= LTTNG_OK
) {
3803 snapshot_success
= 1;
3809 if (snapshot_success
) {
3810 session
->snapshot
.nb_snapshot
++;
3812 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
3820 * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
3822 int cmd_set_session_shm_path(struct ltt_session
*session
,
3823 const char *shm_path
)
3829 * Can only set shm path before session is started.
3831 if (session
->has_been_started
) {
3832 return LTTNG_ERR_SESSION_STARTED
;
3835 strncpy(session
->shm_path
, shm_path
,
3836 sizeof(session
->shm_path
));
3837 session
->shm_path
[sizeof(session
->shm_path
) - 1] = '\0';
3843 * Init command subsystem.
3848 * Set network sequence index to 1 for streams to match a relayd
3849 * socket on the consumer side.
3851 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
3852 relayd_net_seq_idx
= 1;
3853 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
3855 DBG("Command subsystem initialized");