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>
31 #include <common/kernel-ctl/kernel-ctl.h>
36 #include "health-sessiond.h"
38 #include "kernel-consumer.h"
39 #include "lttng-sessiond.h"
43 #include "buffer-registry.h"
48 * Used to keep a unique index for each relayd socket created where this value
49 * is associated with streams on the consumer so it can match the right relayd
50 * to send to. It must be accessed with the relayd_net_seq_idx_lock
53 static pthread_mutex_t relayd_net_seq_idx_lock
= PTHREAD_MUTEX_INITIALIZER
;
54 static uint64_t relayd_net_seq_idx
;
56 static int validate_event_name(const char *);
57 static int validate_ust_event_name(const char *);
58 static int cmd_enable_event_internal(struct ltt_session
*session
,
59 struct lttng_domain
*domain
,
60 char *channel_name
, struct lttng_event
*event
,
61 char *filter_expression
,
62 struct lttng_filter_bytecode
*filter
,
63 struct lttng_event_exclusion
*exclusion
,
67 * Create a session path used by list_lttng_sessions for the case that the
68 * session consumer is on the network.
70 static int build_network_session_path(char *dst
, size_t size
,
71 struct ltt_session
*session
)
73 int ret
, kdata_port
, udata_port
;
74 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
75 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
80 memset(tmp_urls
, 0, sizeof(tmp_urls
));
81 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
83 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
85 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
86 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
87 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
90 if (session
->ust_session
&& session
->ust_session
->consumer
) {
91 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
92 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
95 if (uuri
== NULL
&& kuri
== NULL
) {
96 uri
= &session
->consumer
->dst
.net
.control
;
97 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
98 } else if (kuri
&& uuri
) {
99 ret
= uri_compare(kuri
, uuri
);
103 /* Build uuri URL string */
104 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
111 } else if (kuri
&& uuri
== NULL
) {
113 } else if (uuri
&& kuri
== NULL
) {
117 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
123 * Do we have a UST url set. If yes, this means we have both kernel and UST
126 if (*tmp_uurl
!= '\0') {
127 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
128 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
131 if (kuri
|| (!kuri
&& !uuri
)) {
134 /* No kernel URI, use the UST port. */
137 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, dport
);
145 * Get run-time attributes if the session has been started (discarded events,
148 static int get_kernel_runtime_stats(struct ltt_session
*session
,
149 struct ltt_kernel_channel
*kchan
, uint64_t *discarded_events
,
150 uint64_t *lost_packets
)
154 if (!session
->has_been_started
) {
156 *discarded_events
= 0;
161 ret
= consumer_get_discarded_events(session
->id
, kchan
->fd
,
162 session
->kernel_session
->consumer
,
168 ret
= consumer_get_lost_packets(session
->id
, kchan
->fd
,
169 session
->kernel_session
->consumer
,
180 * Get run-time attributes if the session has been started (discarded events,
183 static int get_ust_runtime_stats(struct ltt_session
*session
,
184 struct ltt_ust_channel
*uchan
, uint64_t *discarded_events
,
185 uint64_t *lost_packets
)
188 struct ltt_ust_session
*usess
;
190 if (!discarded_events
|| !lost_packets
) {
195 usess
= session
->ust_session
;
196 assert(discarded_events
);
197 assert(lost_packets
);
199 if (!usess
|| !session
->has_been_started
) {
200 *discarded_events
= 0;
206 if (usess
->buffer_type
== LTTNG_BUFFER_PER_UID
) {
207 ret
= ust_app_uid_get_channel_runtime_stats(usess
->id
,
208 &usess
->buffer_reg_uid_list
,
209 usess
->consumer
, uchan
->id
,
210 uchan
->attr
.overwrite
,
213 } else if (usess
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
214 ret
= ust_app_pid_get_channel_runtime_stats(usess
,
215 uchan
, usess
->consumer
,
216 uchan
->attr
.overwrite
,
222 *discarded_events
+= uchan
->per_pid_closed_app_discarded
;
223 *lost_packets
+= uchan
->per_pid_closed_app_lost
;
225 ERR("Unsupported buffer type");
236 * Fill lttng_channel array of all channels.
238 static void list_lttng_channels(enum lttng_domain_type domain
,
239 struct ltt_session
*session
, struct lttng_channel
*channels
,
240 struct lttcomm_channel_extended
*chan_exts
)
243 struct ltt_kernel_channel
*kchan
;
245 DBG("Listing channels for session %s", session
->name
);
248 case LTTNG_DOMAIN_KERNEL
:
249 /* Kernel channels */
250 if (session
->kernel_session
!= NULL
) {
251 cds_list_for_each_entry(kchan
,
252 &session
->kernel_session
->channel_list
.head
, list
) {
253 uint64_t discarded_events
, lost_packets
;
255 ret
= get_kernel_runtime_stats(session
, kchan
,
256 &discarded_events
, &lost_packets
);
260 /* Copy lttng_channel struct to array */
261 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
262 channels
[i
].enabled
= kchan
->enabled
;
263 chan_exts
[i
].discarded_events
=
265 chan_exts
[i
].lost_packets
= lost_packets
;
270 case LTTNG_DOMAIN_UST
:
272 struct lttng_ht_iter iter
;
273 struct ltt_ust_channel
*uchan
;
276 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
277 &iter
.iter
, uchan
, node
.node
) {
278 uint64_t discarded_events
= 0, lost_packets
= 0;
280 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
281 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
282 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
283 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
284 channels
[i
].attr
.switch_timer_interval
=
285 uchan
->attr
.switch_timer_interval
;
286 channels
[i
].attr
.read_timer_interval
=
287 uchan
->attr
.read_timer_interval
;
288 channels
[i
].enabled
= uchan
->enabled
;
289 channels
[i
].attr
.tracefile_size
= uchan
->tracefile_size
;
290 channels
[i
].attr
.tracefile_count
= uchan
->tracefile_count
;
293 * Map enum lttng_ust_output to enum lttng_event_output.
295 switch (uchan
->attr
.output
) {
297 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
301 * LTTNG_UST_MMAP is the only supported UST
308 ret
= get_ust_runtime_stats(session
, uchan
,
309 &discarded_events
, &lost_packets
);
313 chan_exts
[i
].discarded_events
= discarded_events
;
314 chan_exts
[i
].lost_packets
= lost_packets
;
328 static void increment_extended_len(const char *filter_expression
,
329 struct lttng_event_exclusion
*exclusion
, size_t *extended_len
)
331 *extended_len
+= sizeof(struct lttcomm_event_extended_header
);
333 if (filter_expression
) {
334 *extended_len
+= strlen(filter_expression
) + 1;
338 *extended_len
+= exclusion
->count
* LTTNG_SYMBOL_NAME_LEN
;
342 static void append_extended_info(const char *filter_expression
,
343 struct lttng_event_exclusion
*exclusion
, void **extended_at
)
345 struct lttcomm_event_extended_header extended_header
;
346 size_t filter_len
= 0;
347 size_t nb_exclusions
= 0;
349 if (filter_expression
) {
350 filter_len
= strlen(filter_expression
) + 1;
354 nb_exclusions
= exclusion
->count
;
357 /* Set header fields */
358 extended_header
.filter_len
= filter_len
;
359 extended_header
.nb_exclusions
= nb_exclusions
;
362 memcpy(*extended_at
, &extended_header
, sizeof(extended_header
));
363 *extended_at
+= sizeof(extended_header
);
365 /* Copy filter string */
366 if (filter_expression
) {
367 memcpy(*extended_at
, filter_expression
, filter_len
);
368 *extended_at
+= filter_len
;
371 /* Copy exclusion names */
373 size_t len
= nb_exclusions
* LTTNG_SYMBOL_NAME_LEN
;
375 memcpy(*extended_at
, &exclusion
->names
, len
);
381 * Create a list of agent domain events.
383 * Return number of events in list on success or else a negative value.
385 static int list_lttng_agent_events(struct agent
*agt
,
386 struct lttng_event
**events
, size_t *total_size
)
389 unsigned int nb_event
= 0;
390 struct agent_event
*event
;
391 struct lttng_event
*tmp_events
;
392 struct lttng_ht_iter iter
;
393 size_t extended_len
= 0;
399 DBG3("Listing agent events");
402 nb_event
= lttng_ht_get_count(agt
->events
);
410 /* Compute required extended infos size */
411 extended_len
= nb_event
* sizeof(struct lttcomm_event_extended_header
);
414 * This is only valid because the commands which add events are
415 * processed in the same thread as the listing.
418 cds_lfht_for_each_entry(agt
->events
->ht
, &iter
.iter
, event
, node
.node
) {
419 increment_extended_len(event
->filter_expression
, NULL
,
424 *total_size
= nb_event
* sizeof(*tmp_events
) + extended_len
;
425 tmp_events
= zmalloc(*total_size
);
427 PERROR("zmalloc agent events session");
428 ret
= -LTTNG_ERR_FATAL
;
432 extended_at
= ((uint8_t *) tmp_events
) +
433 nb_event
* sizeof(struct lttng_event
);
436 cds_lfht_for_each_entry(agt
->events
->ht
, &iter
.iter
, event
, node
.node
) {
437 strncpy(tmp_events
[i
].name
, event
->name
, sizeof(tmp_events
[i
].name
));
438 tmp_events
[i
].name
[sizeof(tmp_events
[i
].name
) - 1] = '\0';
439 tmp_events
[i
].enabled
= event
->enabled
;
440 tmp_events
[i
].loglevel
= event
->loglevel_value
;
441 tmp_events
[i
].loglevel_type
= event
->loglevel_type
;
444 /* Append extended info */
445 append_extended_info(event
->filter_expression
, NULL
,
450 *events
= tmp_events
;
454 assert(nb_event
== i
);
459 * Create a list of ust global domain events.
461 static int list_lttng_ust_global_events(char *channel_name
,
462 struct ltt_ust_domain_global
*ust_global
,
463 struct lttng_event
**events
, size_t *total_size
)
466 unsigned int nb_event
= 0;
467 struct lttng_ht_iter iter
;
468 struct lttng_ht_node_str
*node
;
469 struct ltt_ust_channel
*uchan
;
470 struct ltt_ust_event
*uevent
;
471 struct lttng_event
*tmp
;
472 size_t extended_len
= 0;
475 DBG("Listing UST global events for channel %s", channel_name
);
479 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
480 node
= lttng_ht_iter_get_node_str(&iter
);
482 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
486 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
488 nb_event
= lttng_ht_get_count(uchan
->events
);
495 DBG3("Listing UST global %d events", nb_event
);
497 /* Compute required extended infos size */
498 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
499 if (uevent
->internal
) {
504 increment_extended_len(uevent
->filter_expression
,
505 uevent
->exclusion
, &extended_len
);
508 /* All events are internal, skip. */
514 *total_size
= nb_event
* sizeof(struct lttng_event
) + extended_len
;
515 tmp
= zmalloc(*total_size
);
517 ret
= -LTTNG_ERR_FATAL
;
521 extended_at
= ((uint8_t *) tmp
) + nb_event
* sizeof(struct lttng_event
);
523 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
524 if (uevent
->internal
) {
525 /* This event should remain hidden from clients */
528 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
529 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
530 tmp
[i
].enabled
= uevent
->enabled
;
532 switch (uevent
->attr
.instrumentation
) {
533 case LTTNG_UST_TRACEPOINT
:
534 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
536 case LTTNG_UST_PROBE
:
537 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
539 case LTTNG_UST_FUNCTION
:
540 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
544 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
545 switch (uevent
->attr
.loglevel_type
) {
546 case LTTNG_UST_LOGLEVEL_ALL
:
547 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
549 case LTTNG_UST_LOGLEVEL_RANGE
:
550 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
552 case LTTNG_UST_LOGLEVEL_SINGLE
:
553 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
556 if (uevent
->filter
) {
559 if (uevent
->exclusion
) {
560 tmp
[i
].exclusion
= 1;
564 /* Append extended info */
565 append_extended_info(uevent
->filter_expression
,
566 uevent
->exclusion
, &extended_at
);
577 * Fill lttng_event array of all kernel events in the channel.
579 static int list_lttng_kernel_events(char *channel_name
,
580 struct ltt_kernel_session
*kernel_session
,
581 struct lttng_event
**events
, size_t *total_size
)
584 unsigned int nb_event
;
585 struct ltt_kernel_event
*event
;
586 struct ltt_kernel_channel
*kchan
;
587 size_t extended_len
= 0;
590 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
592 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
596 nb_event
= kchan
->event_count
;
598 DBG("Listing events for channel %s", kchan
->channel
->name
);
606 /* Compute required extended infos size */
607 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
608 increment_extended_len(event
->filter_expression
, NULL
,
612 *total_size
= nb_event
* sizeof(struct lttng_event
) + extended_len
;
613 *events
= zmalloc(*total_size
);
614 if (*events
== NULL
) {
615 ret
= LTTNG_ERR_FATAL
;
619 extended_at
= ((void *) *events
) +
620 nb_event
* sizeof(struct lttng_event
);
622 /* Kernel channels */
623 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
624 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
625 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
626 (*events
)[i
].enabled
= event
->enabled
;
627 (*events
)[i
].filter
=
628 (unsigned char) !!event
->filter_expression
;
630 switch (event
->event
->instrumentation
) {
631 case LTTNG_KERNEL_TRACEPOINT
:
632 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
634 case LTTNG_KERNEL_KRETPROBE
:
635 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
636 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
637 sizeof(struct lttng_kernel_kprobe
));
639 case LTTNG_KERNEL_KPROBE
:
640 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
641 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
642 sizeof(struct lttng_kernel_kprobe
));
644 case LTTNG_KERNEL_FUNCTION
:
645 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
646 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
647 sizeof(struct lttng_kernel_function
));
649 case LTTNG_KERNEL_NOOP
:
650 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
652 case LTTNG_KERNEL_SYSCALL
:
653 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
655 case LTTNG_KERNEL_ALL
:
661 /* Append extended info */
662 append_extended_info(event
->filter_expression
, NULL
,
670 /* Negate the error code to differentiate the size from an error */
675 * Add URI so the consumer output object. Set the correct path depending on the
676 * domain adding the default trace directory.
678 static int add_uri_to_consumer(struct consumer_output
*consumer
,
679 struct lttng_uri
*uri
, enum lttng_domain_type domain
,
680 const char *session_name
)
683 const char *default_trace_dir
;
687 if (consumer
== NULL
) {
688 DBG("No consumer detected. Don't add URI. Stopping.");
689 ret
= LTTNG_ERR_NO_CONSUMER
;
694 case LTTNG_DOMAIN_KERNEL
:
695 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
697 case LTTNG_DOMAIN_UST
:
698 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
702 * This case is possible is we try to add the URI to the global tracing
703 * session consumer object which in this case there is no subdir.
705 default_trace_dir
= "";
708 switch (uri
->dtype
) {
711 DBG2("Setting network URI to consumer");
713 if (consumer
->type
== CONSUMER_DST_NET
) {
714 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
715 consumer
->dst
.net
.control_isset
) ||
716 (uri
->stype
== LTTNG_STREAM_DATA
&&
717 consumer
->dst
.net
.data_isset
)) {
718 ret
= LTTNG_ERR_URL_EXIST
;
722 memset(&consumer
->dst
.net
, 0, sizeof(consumer
->dst
.net
));
725 consumer
->type
= CONSUMER_DST_NET
;
727 /* Set URI into consumer output object */
728 ret
= consumer_set_network_uri(consumer
, uri
);
732 } else if (ret
== 1) {
734 * URI was the same in the consumer so we do not append the subdir
735 * again so to not duplicate output dir.
741 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
742 ret
= consumer_set_subdir(consumer
, session_name
);
744 ret
= LTTNG_ERR_FATAL
;
749 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
750 /* On a new subdir, reappend the default trace dir. */
751 strncat(consumer
->subdir
, default_trace_dir
,
752 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
753 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
758 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
759 memset(consumer
->dst
.trace_path
, 0,
760 sizeof(consumer
->dst
.trace_path
));
761 /* Explicit length checks for strcpy and strcat. */
762 if (strlen(uri
->dst
.path
) + strlen(default_trace_dir
)
763 >= sizeof(consumer
->dst
.trace_path
)) {
764 ret
= LTTNG_ERR_FATAL
;
767 strcpy(consumer
->dst
.trace_path
, uri
->dst
.path
);
768 /* Append default trace dir */
769 strcat(consumer
->dst
.trace_path
, default_trace_dir
);
770 /* Flag consumer as local. */
771 consumer
->type
= CONSUMER_DST_LOCAL
;
782 * Init tracing by creating trace directory and sending fds kernel consumer.
784 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
787 struct lttng_ht_iter iter
;
788 struct consumer_socket
*socket
;
794 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
795 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
797 pthread_mutex_lock(socket
->lock
);
798 ret
= kernel_consumer_send_session(socket
, session
);
799 pthread_mutex_unlock(socket
->lock
);
801 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
813 * Create a socket to the relayd using the URI.
815 * On success, the relayd_sock pointer is set to the created socket.
816 * Else, it's stays untouched and a lttcomm error code is returned.
818 static int create_connect_relayd(struct lttng_uri
*uri
,
819 struct lttcomm_relayd_sock
**relayd_sock
,
820 struct consumer_output
*consumer
)
823 struct lttcomm_relayd_sock
*rsock
;
825 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
826 RELAYD_VERSION_COMM_MINOR
);
828 ret
= LTTNG_ERR_FATAL
;
833 * Connect to relayd so we can proceed with a session creation. This call
834 * can possibly block for an arbitrary amount of time to set the health
835 * state to be in poll execution.
838 ret
= relayd_connect(rsock
);
841 ERR("Unable to reach lttng-relayd");
842 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
846 /* Create socket for control stream. */
847 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
848 DBG3("Creating relayd stream socket from URI");
850 /* Check relayd version */
851 ret
= relayd_version_check(rsock
);
853 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
856 consumer
->relay_major_version
= rsock
->major
;
857 consumer
->relay_minor_version
= rsock
->minor
;
858 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
859 DBG3("Creating relayd data socket from URI");
861 /* Command is not valid */
862 ERR("Relayd invalid stream type: %d", uri
->stype
);
863 ret
= LTTNG_ERR_INVALID
;
867 *relayd_sock
= rsock
;
872 /* The returned value is not useful since we are on an error path. */
873 (void) relayd_close(rsock
);
881 * Connect to the relayd using URI and send the socket to the right consumer.
883 static int send_consumer_relayd_socket(enum lttng_domain_type domain
,
884 unsigned int session_id
, struct lttng_uri
*relayd_uri
,
885 struct consumer_output
*consumer
,
886 struct consumer_socket
*consumer_sock
,
887 char *session_name
, char *hostname
, int session_live_timer
)
890 struct lttcomm_relayd_sock
*rsock
= NULL
;
892 /* Connect to relayd and make version check if uri is the control. */
893 ret
= create_connect_relayd(relayd_uri
, &rsock
, consumer
);
894 if (ret
!= LTTNG_OK
) {
899 /* Set the network sequence index if not set. */
900 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
901 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
903 * Increment net_seq_idx because we are about to transfer the
904 * new relayd socket to the consumer.
905 * Assign unique key so the consumer can match streams.
907 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
908 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
911 /* Send relayd socket to consumer. */
912 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
913 relayd_uri
->stype
, session_id
,
914 session_name
, hostname
, session_live_timer
);
916 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
920 /* Flag that the corresponding socket was sent. */
921 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
922 consumer_sock
->control_sock_sent
= 1;
923 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
924 consumer_sock
->data_sock_sent
= 1;
930 * Close socket which was dup on the consumer side. The session daemon does
931 * NOT keep track of the relayd socket(s) once transfer to the consumer.
935 (void) relayd_close(rsock
);
939 if (ret
!= LTTNG_OK
) {
941 * The consumer output for this session should not be used anymore
942 * since the relayd connection failed thus making any tracing or/and
943 * streaming not usable.
945 consumer
->enabled
= 0;
951 * Send both relayd sockets to a specific consumer and domain. This is a
952 * helper function to facilitate sending the information to the consumer for a
955 static int send_consumer_relayd_sockets(enum lttng_domain_type domain
,
956 unsigned int session_id
, struct consumer_output
*consumer
,
957 struct consumer_socket
*sock
, char *session_name
,
958 char *hostname
, int session_live_timer
)
965 /* Sending control relayd socket. */
966 if (!sock
->control_sock_sent
) {
967 ret
= send_consumer_relayd_socket(domain
, session_id
,
968 &consumer
->dst
.net
.control
, consumer
, sock
,
969 session_name
, hostname
, session_live_timer
);
970 if (ret
!= LTTNG_OK
) {
975 /* Sending data relayd socket. */
976 if (!sock
->data_sock_sent
) {
977 ret
= send_consumer_relayd_socket(domain
, session_id
,
978 &consumer
->dst
.net
.data
, consumer
, sock
,
979 session_name
, hostname
, session_live_timer
);
980 if (ret
!= LTTNG_OK
) {
990 * Setup relayd connections for a tracing session. First creates the socket to
991 * the relayd and send them to the right domain consumer. Consumer type MUST be
994 int cmd_setup_relayd(struct ltt_session
*session
)
997 struct ltt_ust_session
*usess
;
998 struct ltt_kernel_session
*ksess
;
999 struct consumer_socket
*socket
;
1000 struct lttng_ht_iter iter
;
1004 usess
= session
->ust_session
;
1005 ksess
= session
->kernel_session
;
1007 DBG("Setting relayd for session %s", session
->name
);
1011 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
1012 && usess
->consumer
->enabled
) {
1013 /* For each consumer socket, send relayd sockets */
1014 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
1015 socket
, node
.node
) {
1016 pthread_mutex_lock(socket
->lock
);
1017 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
->id
,
1018 usess
->consumer
, socket
,
1019 session
->name
, session
->hostname
,
1020 session
->live_timer
);
1021 pthread_mutex_unlock(socket
->lock
);
1022 if (ret
!= LTTNG_OK
) {
1025 /* Session is now ready for network streaming. */
1026 session
->net_handle
= 1;
1028 session
->consumer
->relay_major_version
=
1029 usess
->consumer
->relay_major_version
;
1030 session
->consumer
->relay_minor_version
=
1031 usess
->consumer
->relay_minor_version
;
1034 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
1035 && ksess
->consumer
->enabled
) {
1036 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
1037 socket
, node
.node
) {
1038 pthread_mutex_lock(socket
->lock
);
1039 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
->id
,
1040 ksess
->consumer
, socket
,
1041 session
->name
, session
->hostname
,
1042 session
->live_timer
);
1043 pthread_mutex_unlock(socket
->lock
);
1044 if (ret
!= LTTNG_OK
) {
1047 /* Session is now ready for network streaming. */
1048 session
->net_handle
= 1;
1050 session
->consumer
->relay_major_version
=
1051 ksess
->consumer
->relay_major_version
;
1052 session
->consumer
->relay_minor_version
=
1053 ksess
->consumer
->relay_minor_version
;
1062 * Start a kernel session by opening all necessary streams.
1064 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
1067 struct ltt_kernel_channel
*kchan
;
1069 /* Open kernel metadata */
1070 if (ksess
->metadata
== NULL
&& ksess
->output_traces
) {
1071 ret
= kernel_open_metadata(ksess
);
1073 ret
= LTTNG_ERR_KERN_META_FAIL
;
1078 /* Open kernel metadata stream */
1079 if (ksess
->metadata
&& ksess
->metadata_stream_fd
< 0) {
1080 ret
= kernel_open_metadata_stream(ksess
);
1082 ERR("Kernel create metadata stream failed");
1083 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1088 /* For each channel */
1089 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
1090 if (kchan
->stream_count
== 0) {
1091 ret
= kernel_open_channel_stream(kchan
);
1093 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1096 /* Update the stream global counter */
1097 ksess
->stream_count_global
+= ret
;
1101 /* Setup kernel consumer socket and send fds to it */
1102 ret
= init_kernel_tracing(ksess
);
1104 ret
= LTTNG_ERR_KERN_START_FAIL
;
1108 /* This start the kernel tracing */
1109 ret
= kernel_start_session(ksess
);
1111 ret
= LTTNG_ERR_KERN_START_FAIL
;
1115 /* Quiescent wait after starting trace */
1116 kernel_wait_quiescent(kernel_tracer_fd
);
1127 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1129 int cmd_disable_channel(struct ltt_session
*session
,
1130 enum lttng_domain_type domain
, char *channel_name
)
1133 struct ltt_ust_session
*usess
;
1135 usess
= session
->ust_session
;
1140 case LTTNG_DOMAIN_KERNEL
:
1142 ret
= channel_kernel_disable(session
->kernel_session
,
1144 if (ret
!= LTTNG_OK
) {
1148 kernel_wait_quiescent(kernel_tracer_fd
);
1151 case LTTNG_DOMAIN_UST
:
1153 struct ltt_ust_channel
*uchan
;
1154 struct lttng_ht
*chan_ht
;
1156 chan_ht
= usess
->domain_global
.channels
;
1158 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
1159 if (uchan
== NULL
) {
1160 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1164 ret
= channel_ust_disable(usess
, uchan
);
1165 if (ret
!= LTTNG_OK
) {
1171 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1183 * Command LTTNG_TRACK_PID processed by the client thread.
1185 * Called with session lock held.
1187 int cmd_track_pid(struct ltt_session
*session
, enum lttng_domain_type domain
,
1195 case LTTNG_DOMAIN_KERNEL
:
1197 struct ltt_kernel_session
*ksess
;
1199 ksess
= session
->kernel_session
;
1201 ret
= kernel_track_pid(ksess
, pid
);
1202 if (ret
!= LTTNG_OK
) {
1206 kernel_wait_quiescent(kernel_tracer_fd
);
1209 case LTTNG_DOMAIN_UST
:
1211 struct ltt_ust_session
*usess
;
1213 usess
= session
->ust_session
;
1215 ret
= trace_ust_track_pid(usess
, pid
);
1216 if (ret
!= LTTNG_OK
) {
1222 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1234 * Command LTTNG_UNTRACK_PID processed by the client thread.
1236 * Called with session lock held.
1238 int cmd_untrack_pid(struct ltt_session
*session
, enum lttng_domain_type domain
,
1246 case LTTNG_DOMAIN_KERNEL
:
1248 struct ltt_kernel_session
*ksess
;
1250 ksess
= session
->kernel_session
;
1252 ret
= kernel_untrack_pid(ksess
, pid
);
1253 if (ret
!= LTTNG_OK
) {
1257 kernel_wait_quiescent(kernel_tracer_fd
);
1260 case LTTNG_DOMAIN_UST
:
1262 struct ltt_ust_session
*usess
;
1264 usess
= session
->ust_session
;
1266 ret
= trace_ust_untrack_pid(usess
, pid
);
1267 if (ret
!= LTTNG_OK
) {
1273 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1285 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1287 * The wpipe arguments is used as a notifier for the kernel thread.
1289 int cmd_enable_channel(struct ltt_session
*session
,
1290 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
1293 struct ltt_ust_session
*usess
= session
->ust_session
;
1294 struct lttng_ht
*chan_ht
;
1301 len
= lttng_strnlen(attr
->name
, sizeof(attr
->name
));
1303 /* Validate channel name */
1304 if (attr
->name
[0] == '.' ||
1305 memchr(attr
->name
, '/', len
) != NULL
) {
1306 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1310 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
1315 * Don't try to enable a channel if the session has been started at
1316 * some point in time before. The tracer does not allow it.
1318 if (session
->has_been_started
) {
1319 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1324 * If the session is a live session, remove the switch timer, the
1325 * live timer does the same thing but sends also synchronisation
1326 * beacons for inactive streams.
1328 if (session
->live_timer
> 0) {
1329 attr
->attr
.live_timer_interval
= session
->live_timer
;
1330 attr
->attr
.switch_timer_interval
= 0;
1334 * The ringbuffer (both in user space and kernel) behave badly in overwrite
1335 * mode and with less than 2 subbuf so block it right away and send back an
1336 * invalid attribute error.
1338 if (attr
->attr
.overwrite
&& attr
->attr
.num_subbuf
< 2) {
1339 ret
= LTTNG_ERR_INVALID
;
1343 switch (domain
->type
) {
1344 case LTTNG_DOMAIN_KERNEL
:
1346 struct ltt_kernel_channel
*kchan
;
1348 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
1349 session
->kernel_session
);
1350 if (kchan
== NULL
) {
1351 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
1352 if (attr
->name
[0] != '\0') {
1353 session
->kernel_session
->has_non_default_channel
= 1;
1356 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
1359 if (ret
!= LTTNG_OK
) {
1363 kernel_wait_quiescent(kernel_tracer_fd
);
1366 case LTTNG_DOMAIN_UST
:
1367 case LTTNG_DOMAIN_JUL
:
1368 case LTTNG_DOMAIN_LOG4J
:
1369 case LTTNG_DOMAIN_PYTHON
:
1371 struct ltt_ust_channel
*uchan
;
1376 * Current agent implementation limitations force us to allow
1377 * only one channel at once in "agent" subdomains. Each
1378 * subdomain has a default channel name which must be strictly
1381 if (domain
->type
== LTTNG_DOMAIN_JUL
) {
1382 if (strncmp(attr
->name
, DEFAULT_JUL_CHANNEL_NAME
,
1383 LTTNG_SYMBOL_NAME_LEN
)) {
1384 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1387 } else if (domain
->type
== LTTNG_DOMAIN_LOG4J
) {
1388 if (strncmp(attr
->name
, DEFAULT_LOG4J_CHANNEL_NAME
,
1389 LTTNG_SYMBOL_NAME_LEN
)) {
1390 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1393 } else if (domain
->type
== LTTNG_DOMAIN_PYTHON
) {
1394 if (strncmp(attr
->name
, DEFAULT_PYTHON_CHANNEL_NAME
,
1395 LTTNG_SYMBOL_NAME_LEN
)) {
1396 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1401 chan_ht
= usess
->domain_global
.channels
;
1403 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
1404 if (uchan
== NULL
) {
1405 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
1406 if (attr
->name
[0] != '\0') {
1407 usess
->has_non_default_channel
= 1;
1410 ret
= channel_ust_enable(usess
, uchan
);
1415 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1426 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1428 int cmd_disable_event(struct ltt_session
*session
,
1429 enum lttng_domain_type domain
, char *channel_name
,
1430 struct lttng_event
*event
)
1435 DBG("Disable event command for event \'%s\'", event
->name
);
1437 event_name
= event
->name
;
1438 if (validate_event_name(event_name
)) {
1439 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1443 /* Error out on unhandled search criteria */
1444 if (event
->loglevel_type
|| event
->loglevel
!= -1 || event
->enabled
1445 || event
->pid
|| event
->filter
|| event
->exclusion
) {
1446 ret
= LTTNG_ERR_UNK
;
1453 case LTTNG_DOMAIN_KERNEL
:
1455 struct ltt_kernel_channel
*kchan
;
1456 struct ltt_kernel_session
*ksess
;
1458 ksess
= session
->kernel_session
;
1461 * If a non-default channel has been created in the
1462 * session, explicitely require that -c chan_name needs
1465 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1466 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1470 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1471 if (kchan
== NULL
) {
1472 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1476 switch (event
->type
) {
1477 case LTTNG_EVENT_ALL
:
1478 case LTTNG_EVENT_TRACEPOINT
:
1479 case LTTNG_EVENT_SYSCALL
:
1480 case LTTNG_EVENT_PROBE
:
1481 case LTTNG_EVENT_FUNCTION
:
1482 case LTTNG_EVENT_FUNCTION_ENTRY
:/* fall-through */
1483 if (event_name
[0] == '\0') {
1484 ret
= event_kernel_disable_event(kchan
,
1487 ret
= event_kernel_disable_event(kchan
,
1488 event_name
, event
->type
);
1490 if (ret
!= LTTNG_OK
) {
1495 ret
= LTTNG_ERR_UNK
;
1499 kernel_wait_quiescent(kernel_tracer_fd
);
1502 case LTTNG_DOMAIN_UST
:
1504 struct ltt_ust_channel
*uchan
;
1505 struct ltt_ust_session
*usess
;
1507 usess
= session
->ust_session
;
1509 if (validate_ust_event_name(event_name
)) {
1510 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1515 * If a non-default channel has been created in the
1516 * session, explicitly require that -c chan_name needs
1519 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1520 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1524 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1526 if (uchan
== NULL
) {
1527 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1531 switch (event
->type
) {
1532 case LTTNG_EVENT_ALL
:
1534 * An empty event name means that everything
1535 * should be disabled.
1537 if (event
->name
[0] == '\0') {
1538 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1540 ret
= event_ust_disable_tracepoint(usess
, uchan
,
1543 if (ret
!= LTTNG_OK
) {
1548 ret
= LTTNG_ERR_UNK
;
1552 DBG3("Disable UST event %s in channel %s completed", event_name
,
1556 case LTTNG_DOMAIN_LOG4J
:
1557 case LTTNG_DOMAIN_JUL
:
1558 case LTTNG_DOMAIN_PYTHON
:
1561 struct ltt_ust_session
*usess
= session
->ust_session
;
1565 switch (event
->type
) {
1566 case LTTNG_EVENT_ALL
:
1569 ret
= LTTNG_ERR_UNK
;
1573 agt
= trace_ust_find_agent(usess
, domain
);
1575 ret
= -LTTNG_ERR_UST_EVENT_NOT_FOUND
;
1579 * An empty event name means that everything
1580 * should be disabled.
1582 if (event
->name
[0] == '\0') {
1583 ret
= event_agent_disable_all(usess
, agt
);
1585 ret
= event_agent_disable(usess
, agt
, event_name
);
1587 if (ret
!= LTTNG_OK
) {
1594 ret
= LTTNG_ERR_UND
;
1607 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1609 int cmd_add_context(struct ltt_session
*session
, enum lttng_domain_type domain
,
1610 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1612 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1613 char *app_ctx_provider_name
= NULL
, *app_ctx_name
= NULL
;
1615 if (ctx
->ctx
== LTTNG_EVENT_CONTEXT_APP_CONTEXT
) {
1616 app_ctx_provider_name
= ctx
->u
.app_ctx
.provider_name
;
1617 app_ctx_name
= ctx
->u
.app_ctx
.ctx_name
;
1621 case LTTNG_DOMAIN_KERNEL
:
1622 assert(session
->kernel_session
);
1624 if (session
->kernel_session
->channel_count
== 0) {
1625 /* Create default channel */
1626 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1627 if (ret
!= LTTNG_OK
) {
1630 chan_kern_created
= 1;
1632 /* Add kernel context to kernel tracer */
1633 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1634 if (ret
!= LTTNG_OK
) {
1638 case LTTNG_DOMAIN_JUL
:
1639 case LTTNG_DOMAIN_LOG4J
:
1642 * Validate channel name.
1643 * If no channel name is given and the domain is JUL or LOG4J,
1644 * set it to the appropriate domain-specific channel name. If
1645 * a name is provided but does not match the expexted channel
1646 * name, return an error.
1648 if (domain
== LTTNG_DOMAIN_JUL
&& *channel_name
&&
1649 strcmp(channel_name
,
1650 DEFAULT_JUL_CHANNEL_NAME
)) {
1651 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1653 } else if (domain
== LTTNG_DOMAIN_LOG4J
&& *channel_name
&&
1654 strcmp(channel_name
,
1655 DEFAULT_LOG4J_CHANNEL_NAME
)) {
1656 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1659 /* break is _not_ missing here. */
1661 case LTTNG_DOMAIN_UST
:
1663 struct ltt_ust_session
*usess
= session
->ust_session
;
1664 unsigned int chan_count
;
1668 chan_count
= lttng_ht_get_count(usess
->domain_global
.channels
);
1669 if (chan_count
== 0) {
1670 struct lttng_channel
*attr
;
1671 /* Create default channel */
1672 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1674 ret
= LTTNG_ERR_FATAL
;
1678 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1679 if (ret
!= LTTNG_OK
) {
1684 chan_ust_created
= 1;
1687 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1688 free(app_ctx_provider_name
);
1690 app_ctx_name
= NULL
;
1691 app_ctx_provider_name
= NULL
;
1692 if (ret
!= LTTNG_OK
) {
1698 ret
= LTTNG_ERR_UND
;
1706 if (chan_kern_created
) {
1707 struct ltt_kernel_channel
*kchan
=
1708 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1709 session
->kernel_session
);
1710 /* Created previously, this should NOT fail. */
1712 kernel_destroy_channel(kchan
);
1715 if (chan_ust_created
) {
1716 struct ltt_ust_channel
*uchan
=
1717 trace_ust_find_channel_by_name(
1718 session
->ust_session
->domain_global
.channels
,
1719 DEFAULT_CHANNEL_NAME
);
1720 /* Created previously, this should NOT fail. */
1722 /* Remove from the channel list of the session. */
1723 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1725 trace_ust_destroy_channel(uchan
);
1728 free(app_ctx_provider_name
);
1733 static int validate_event_name(const char *name
)
1736 const char *c
= name
;
1737 const char *event_name_end
= c
+ LTTNG_SYMBOL_NAME_LEN
;
1738 bool null_terminated
= false;
1741 * Make sure that unescaped wildcards are only used as the last
1742 * character of the event name.
1744 while (c
< event_name_end
) {
1747 null_terminated
= true;
1753 if ((c
+ 1) < event_name_end
&& *(c
+ 1)) {
1754 /* Wildcard is not the last character */
1755 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1764 if (!ret
&& !null_terminated
) {
1765 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1770 static inline bool name_starts_with(const char *name
, const char *prefix
)
1772 const size_t max_cmp_len
= min(strlen(prefix
), LTTNG_SYMBOL_NAME_LEN
);
1774 return !strncmp(name
, prefix
, max_cmp_len
);
1777 /* Perform userspace-specific event name validation */
1778 static int validate_ust_event_name(const char *name
)
1788 * Check name against all internal UST event component namespaces used
1791 if (name_starts_with(name
, DEFAULT_JUL_EVENT_COMPONENT
) ||
1792 name_starts_with(name
, DEFAULT_LOG4J_EVENT_COMPONENT
) ||
1793 name_starts_with(name
, DEFAULT_PYTHON_EVENT_COMPONENT
)) {
1802 * Internal version of cmd_enable_event() with a supplemental
1803 * "internal_event" flag which is used to enable internal events which should
1804 * be hidden from clients. Such events are used in the agent implementation to
1805 * enable the events through which all "agent" events are funeled.
1807 static int _cmd_enable_event(struct ltt_session
*session
,
1808 struct lttng_domain
*domain
,
1809 char *channel_name
, struct lttng_event
*event
,
1810 char *filter_expression
,
1811 struct lttng_filter_bytecode
*filter
,
1812 struct lttng_event_exclusion
*exclusion
,
1813 int wpipe
, bool internal_event
)
1815 int ret
, channel_created
= 0;
1816 struct lttng_channel
*attr
= NULL
;
1820 assert(channel_name
);
1822 /* If we have a filter, we must have its filter expression */
1823 assert(!(!!filter_expression
^ !!filter
));
1825 DBG("Enable event command for event \'%s\'", event
->name
);
1829 ret
= validate_event_name(event
->name
);
1834 switch (domain
->type
) {
1835 case LTTNG_DOMAIN_KERNEL
:
1837 struct ltt_kernel_channel
*kchan
;
1840 * If a non-default channel has been created in the
1841 * session, explicitely require that -c chan_name needs
1844 if (session
->kernel_session
->has_non_default_channel
1845 && channel_name
[0] == '\0') {
1846 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1850 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1851 session
->kernel_session
);
1852 if (kchan
== NULL
) {
1853 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1854 LTTNG_BUFFER_GLOBAL
);
1856 ret
= LTTNG_ERR_FATAL
;
1859 if (lttng_strncpy(attr
->name
, channel_name
,
1860 sizeof(attr
->name
))) {
1861 ret
= LTTNG_ERR_INVALID
;
1865 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1866 if (ret
!= LTTNG_OK
) {
1869 channel_created
= 1;
1872 /* Get the newly created kernel channel pointer */
1873 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1874 session
->kernel_session
);
1875 if (kchan
== NULL
) {
1876 /* This sould not happen... */
1877 ret
= LTTNG_ERR_FATAL
;
1881 switch (event
->type
) {
1882 case LTTNG_EVENT_ALL
:
1884 char *filter_expression_a
= NULL
;
1885 struct lttng_filter_bytecode
*filter_a
= NULL
;
1888 * We need to duplicate filter_expression and filter,
1889 * because ownership is passed to first enable
1892 if (filter_expression
) {
1893 filter_expression_a
= strdup(filter_expression
);
1894 if (!filter_expression_a
) {
1895 ret
= LTTNG_ERR_FATAL
;
1900 filter_a
= zmalloc(sizeof(*filter_a
) + filter
->len
);
1902 free(filter_expression_a
);
1903 ret
= LTTNG_ERR_FATAL
;
1906 memcpy(filter_a
, filter
, sizeof(*filter_a
) + filter
->len
);
1908 event
->type
= LTTNG_EVENT_TRACEPOINT
; /* Hack */
1909 ret
= event_kernel_enable_event(kchan
, event
,
1910 filter_expression
, filter
);
1911 /* We have passed ownership */
1912 filter_expression
= NULL
;
1914 if (ret
!= LTTNG_OK
) {
1915 if (channel_created
) {
1916 /* Let's not leak a useless channel. */
1917 kernel_destroy_channel(kchan
);
1919 free(filter_expression_a
);
1923 event
->type
= LTTNG_EVENT_SYSCALL
; /* Hack */
1924 ret
= event_kernel_enable_event(kchan
, event
,
1925 filter_expression_a
, filter_a
);
1926 /* We have passed ownership */
1927 filter_expression_a
= NULL
;
1929 if (ret
!= LTTNG_OK
) {
1934 case LTTNG_EVENT_PROBE
:
1935 case LTTNG_EVENT_FUNCTION
:
1936 case LTTNG_EVENT_FUNCTION_ENTRY
:
1937 case LTTNG_EVENT_TRACEPOINT
:
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
) {
1944 if (channel_created
) {
1945 /* Let's not leak a useless channel. */
1946 kernel_destroy_channel(kchan
);
1951 case LTTNG_EVENT_SYSCALL
:
1952 ret
= event_kernel_enable_event(kchan
, event
,
1953 filter_expression
, filter
);
1954 /* We have passed ownership */
1955 filter_expression
= NULL
;
1957 if (ret
!= LTTNG_OK
) {
1962 ret
= LTTNG_ERR_UNK
;
1966 kernel_wait_quiescent(kernel_tracer_fd
);
1969 case LTTNG_DOMAIN_UST
:
1971 struct ltt_ust_channel
*uchan
;
1972 struct ltt_ust_session
*usess
= session
->ust_session
;
1977 * If a non-default channel has been created in the
1978 * session, explicitely require that -c chan_name needs
1981 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1982 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1986 /* Get channel from global UST domain */
1987 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1989 if (uchan
== NULL
) {
1990 /* Create default channel */
1991 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1992 usess
->buffer_type
);
1994 ret
= LTTNG_ERR_FATAL
;
1997 if (lttng_strncpy(attr
->name
, channel_name
,
1998 sizeof(attr
->name
))) {
1999 ret
= LTTNG_ERR_INVALID
;
2003 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
2004 if (ret
!= LTTNG_OK
) {
2008 /* Get the newly created channel reference back */
2009 uchan
= trace_ust_find_channel_by_name(
2010 usess
->domain_global
.channels
, channel_name
);
2014 if (uchan
->domain
!= LTTNG_DOMAIN_UST
&& !internal_event
) {
2016 * Don't allow users to add UST events to channels which
2017 * are assigned to a userspace subdomain (JUL, Log4J,
2020 ret
= LTTNG_ERR_INVALID_CHANNEL_DOMAIN
;
2024 if (!internal_event
) {
2026 * Ensure the event name is not reserved for internal
2029 ret
= validate_ust_event_name(event
->name
);
2031 WARN("Userspace event name %s failed validation.",
2033 event
->name
: "NULL");
2034 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
2039 /* At this point, the session and channel exist on the tracer */
2040 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
,
2041 filter_expression
, filter
, exclusion
,
2043 /* We have passed ownership */
2044 filter_expression
= NULL
;
2047 if (ret
== LTTNG_ERR_UST_EVENT_ENABLED
) {
2048 goto already_enabled
;
2049 } else if (ret
!= LTTNG_OK
) {
2054 case LTTNG_DOMAIN_LOG4J
:
2055 case LTTNG_DOMAIN_JUL
:
2056 case LTTNG_DOMAIN_PYTHON
:
2058 const char *default_event_name
, *default_chan_name
;
2060 struct lttng_event uevent
;
2061 struct lttng_domain tmp_dom
;
2062 struct ltt_ust_session
*usess
= session
->ust_session
;
2066 agt
= trace_ust_find_agent(usess
, domain
->type
);
2068 agt
= agent_create(domain
->type
);
2070 ret
= LTTNG_ERR_NOMEM
;
2073 agent_add(agt
, usess
->agents
);
2076 /* Create the default tracepoint. */
2077 memset(&uevent
, 0, sizeof(uevent
));
2078 uevent
.type
= LTTNG_EVENT_TRACEPOINT
;
2079 uevent
.loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
2080 default_event_name
= event_get_default_agent_ust_name(
2082 if (!default_event_name
) {
2083 ret
= LTTNG_ERR_FATAL
;
2086 strncpy(uevent
.name
, default_event_name
, sizeof(uevent
.name
));
2087 uevent
.name
[sizeof(uevent
.name
) - 1] = '\0';
2090 * The domain type is changed because we are about to enable the
2091 * default channel and event for the JUL domain that are hardcoded.
2092 * This happens in the UST domain.
2094 memcpy(&tmp_dom
, domain
, sizeof(tmp_dom
));
2095 tmp_dom
.type
= LTTNG_DOMAIN_UST
;
2097 switch (domain
->type
) {
2098 case LTTNG_DOMAIN_LOG4J
:
2099 default_chan_name
= DEFAULT_LOG4J_CHANNEL_NAME
;
2101 case LTTNG_DOMAIN_JUL
:
2102 default_chan_name
= DEFAULT_JUL_CHANNEL_NAME
;
2104 case LTTNG_DOMAIN_PYTHON
:
2105 default_chan_name
= DEFAULT_PYTHON_CHANNEL_NAME
;
2108 /* The switch/case we are in makes this impossible */
2113 char *filter_expression_copy
= NULL
;
2114 struct lttng_filter_bytecode
*filter_copy
= NULL
;
2117 const size_t filter_size
= sizeof(
2118 struct lttng_filter_bytecode
)
2121 filter_copy
= zmalloc(filter_size
);
2123 ret
= LTTNG_ERR_NOMEM
;
2126 memcpy(filter_copy
, filter
, filter_size
);
2128 filter_expression_copy
=
2129 strdup(filter_expression
);
2130 if (!filter_expression
) {
2131 ret
= LTTNG_ERR_NOMEM
;
2134 if (!filter_expression_copy
|| !filter_copy
) {
2135 free(filter_expression_copy
);
2141 ret
= cmd_enable_event_internal(session
, &tmp_dom
,
2142 (char *) default_chan_name
,
2143 &uevent
, filter_expression_copy
,
2144 filter_copy
, NULL
, wpipe
);
2147 if (ret
== LTTNG_ERR_UST_EVENT_ENABLED
) {
2148 goto already_enabled
;
2149 } else if (ret
!= LTTNG_OK
) {
2153 /* The wild card * means that everything should be enabled. */
2154 if (strncmp(event
->name
, "*", 1) == 0 && strlen(event
->name
) == 1) {
2155 ret
= event_agent_enable_all(usess
, agt
, event
, filter
,
2158 ret
= event_agent_enable(usess
, agt
, event
, filter
,
2162 filter_expression
= NULL
;
2163 if (ret
!= LTTNG_OK
) {
2170 ret
= LTTNG_ERR_UND
;
2178 free(filter_expression
);
2187 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2188 * We own filter, exclusion, and filter_expression.
2190 int cmd_enable_event(struct ltt_session
*session
, 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
, false);
2202 * Enable an event which is internal to LTTng. An internal should
2203 * never be made visible to clients and are immune to checks such as
2206 static int cmd_enable_event_internal(struct ltt_session
*session
,
2207 struct lttng_domain
*domain
,
2208 char *channel_name
, struct lttng_event
*event
,
2209 char *filter_expression
,
2210 struct lttng_filter_bytecode
*filter
,
2211 struct lttng_event_exclusion
*exclusion
,
2214 return _cmd_enable_event(session
, domain
, channel_name
, event
,
2215 filter_expression
, filter
, exclusion
, wpipe
, true);
2219 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2221 ssize_t
cmd_list_tracepoints(enum lttng_domain_type domain
,
2222 struct lttng_event
**events
)
2225 ssize_t nb_events
= 0;
2228 case LTTNG_DOMAIN_KERNEL
:
2229 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2230 if (nb_events
< 0) {
2231 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
2235 case LTTNG_DOMAIN_UST
:
2236 nb_events
= ust_app_list_events(events
);
2237 if (nb_events
< 0) {
2238 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2242 case LTTNG_DOMAIN_LOG4J
:
2243 case LTTNG_DOMAIN_JUL
:
2244 case LTTNG_DOMAIN_PYTHON
:
2245 nb_events
= agent_list_events(events
, domain
);
2246 if (nb_events
< 0) {
2247 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2252 ret
= LTTNG_ERR_UND
;
2259 /* Return negative value to differentiate return code */
2264 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2266 ssize_t
cmd_list_tracepoint_fields(enum lttng_domain_type domain
,
2267 struct lttng_event_field
**fields
)
2270 ssize_t nb_fields
= 0;
2273 case LTTNG_DOMAIN_UST
:
2274 nb_fields
= ust_app_list_event_fields(fields
);
2275 if (nb_fields
< 0) {
2276 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2280 case LTTNG_DOMAIN_KERNEL
:
2281 default: /* fall-through */
2282 ret
= LTTNG_ERR_UND
;
2289 /* Return negative value to differentiate return code */
2293 ssize_t
cmd_list_syscalls(struct lttng_event
**events
)
2295 return syscall_table_list(events
);
2299 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2301 * Called with session lock held.
2303 ssize_t
cmd_list_tracker_pids(struct ltt_session
*session
,
2304 enum lttng_domain_type domain
, int32_t **pids
)
2307 ssize_t nr_pids
= 0;
2310 case LTTNG_DOMAIN_KERNEL
:
2312 struct ltt_kernel_session
*ksess
;
2314 ksess
= session
->kernel_session
;
2315 nr_pids
= kernel_list_tracker_pids(ksess
, pids
);
2317 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
2322 case LTTNG_DOMAIN_UST
:
2324 struct ltt_ust_session
*usess
;
2326 usess
= session
->ust_session
;
2327 nr_pids
= trace_ust_list_tracker_pids(usess
, pids
);
2329 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2334 case LTTNG_DOMAIN_LOG4J
:
2335 case LTTNG_DOMAIN_JUL
:
2336 case LTTNG_DOMAIN_PYTHON
:
2338 ret
= LTTNG_ERR_UND
;
2345 /* Return negative value to differentiate return code */
2350 * Command LTTNG_START_TRACE processed by the client thread.
2352 * Called with session mutex held.
2354 int cmd_start_trace(struct ltt_session
*session
)
2357 unsigned long nb_chan
= 0;
2358 struct ltt_kernel_session
*ksession
;
2359 struct ltt_ust_session
*usess
;
2363 /* Ease our life a bit ;) */
2364 ksession
= session
->kernel_session
;
2365 usess
= session
->ust_session
;
2367 /* Is the session already started? */
2368 if (session
->active
) {
2369 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2374 * Starting a session without channel is useless since after that it's not
2375 * possible to enable channel thus inform the client.
2377 if (usess
&& usess
->domain_global
.channels
) {
2378 nb_chan
+= lttng_ht_get_count(usess
->domain_global
.channels
);
2381 nb_chan
+= ksession
->channel_count
;
2384 ret
= LTTNG_ERR_NO_CHANNEL
;
2388 /* Kernel tracing */
2389 if (ksession
!= NULL
) {
2390 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
2391 if (ret
!= LTTNG_OK
) {
2396 /* Flag session that trace should start automatically */
2399 * Even though the start trace might fail, flag this session active so
2400 * other application coming in are started by default.
2404 ret
= ust_app_start_trace_all(usess
);
2406 ret
= LTTNG_ERR_UST_START_FAIL
;
2411 /* Flag this after a successful start. */
2412 session
->has_been_started
= 1;
2413 session
->active
= 1;
2422 * Command LTTNG_STOP_TRACE processed by the client thread.
2424 int cmd_stop_trace(struct ltt_session
*session
)
2427 struct ltt_kernel_channel
*kchan
;
2428 struct ltt_kernel_session
*ksession
;
2429 struct ltt_ust_session
*usess
;
2434 ksession
= session
->kernel_session
;
2435 usess
= session
->ust_session
;
2437 /* Session is not active. Skip everythong and inform the client. */
2438 if (!session
->active
) {
2439 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
2444 if (ksession
&& ksession
->active
) {
2445 DBG("Stop kernel tracing");
2447 /* Flush metadata if exist */
2448 if (ksession
->metadata_stream_fd
>= 0) {
2449 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2451 ERR("Kernel metadata flush failed");
2455 /* Flush all buffers before stopping */
2456 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2457 ret
= kernel_flush_buffer(kchan
);
2459 ERR("Kernel flush buffer error");
2463 ret
= kernel_stop_session(ksession
);
2465 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
2469 kernel_wait_quiescent(kernel_tracer_fd
);
2471 ksession
->active
= 0;
2474 if (usess
&& usess
->active
) {
2476 * Even though the stop trace might fail, flag this session inactive so
2477 * other application coming in are not started by default.
2481 ret
= ust_app_stop_trace_all(usess
);
2483 ret
= LTTNG_ERR_UST_STOP_FAIL
;
2488 /* Flag inactive after a successful stop. */
2489 session
->active
= 0;
2497 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2499 int cmd_set_consumer_uri(struct ltt_session
*session
, size_t nb_uri
,
2500 struct lttng_uri
*uris
)
2503 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2504 struct ltt_ust_session
*usess
= session
->ust_session
;
2510 /* Can't set consumer URI if the session is active. */
2511 if (session
->active
) {
2512 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2516 /* Set the "global" consumer URIs */
2517 for (i
= 0; i
< nb_uri
; i
++) {
2518 ret
= add_uri_to_consumer(session
->consumer
,
2519 &uris
[i
], 0, session
->name
);
2520 if (ret
!= LTTNG_OK
) {
2525 /* Set UST session URIs */
2526 if (session
->ust_session
) {
2527 for (i
= 0; i
< nb_uri
; i
++) {
2528 ret
= add_uri_to_consumer(
2529 session
->ust_session
->consumer
,
2530 &uris
[i
], LTTNG_DOMAIN_UST
,
2532 if (ret
!= LTTNG_OK
) {
2538 /* Set kernel session URIs */
2539 if (session
->kernel_session
) {
2540 for (i
= 0; i
< nb_uri
; i
++) {
2541 ret
= add_uri_to_consumer(
2542 session
->kernel_session
->consumer
,
2543 &uris
[i
], LTTNG_DOMAIN_KERNEL
,
2545 if (ret
!= LTTNG_OK
) {
2552 * Make sure to set the session in output mode after we set URI since a
2553 * session can be created without URL (thus flagged in no output mode).
2555 session
->output_traces
= 1;
2557 ksess
->output_traces
= 1;
2561 usess
->output_traces
= 1;
2572 * Command LTTNG_CREATE_SESSION processed by the client thread.
2574 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
2575 size_t nb_uri
, lttng_sock_cred
*creds
, unsigned int live_timer
)
2578 struct ltt_session
*session
;
2584 * Verify if the session already exist
2586 * XXX: There is no need for the session lock list here since the caller
2587 * (process_client_msg) is holding it. We might want to change that so a
2588 * single command does not lock the entire session list.
2590 session
= session_find_by_name(name
);
2591 if (session
!= NULL
) {
2592 ret
= LTTNG_ERR_EXIST_SESS
;
2596 /* Create tracing session in the registry */
2597 ret
= session_create(name
, LTTNG_SOCK_GET_UID_CRED(creds
),
2598 LTTNG_SOCK_GET_GID_CRED(creds
));
2599 if (ret
!= LTTNG_OK
) {
2604 * Get the newly created session pointer back
2606 * XXX: There is no need for the session lock list here since the caller
2607 * (process_client_msg) is holding it. We might want to change that so a
2608 * single command does not lock the entire session list.
2610 session
= session_find_by_name(name
);
2613 session
->live_timer
= live_timer
;
2614 /* Create default consumer output for the session not yet created. */
2615 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
2616 if (session
->consumer
== NULL
) {
2617 ret
= LTTNG_ERR_FATAL
;
2618 goto consumer_error
;
2622 ret
= cmd_set_consumer_uri(session
, nb_uri
, uris
);
2623 if (ret
!= LTTNG_OK
) {
2624 goto consumer_error
;
2626 session
->output_traces
= 1;
2628 session
->output_traces
= 0;
2629 DBG2("Session %s created with no output", session
->name
);
2632 session
->consumer
->enabled
= 1;
2637 session_destroy(session
);
2644 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2646 int cmd_create_session_snapshot(char *name
, struct lttng_uri
*uris
,
2647 size_t nb_uri
, lttng_sock_cred
*creds
)
2650 struct ltt_session
*session
;
2651 struct snapshot_output
*new_output
= NULL
;
2657 * Create session in no output mode with URIs set to NULL. The uris we've
2658 * received are for a default snapshot output if one.
2660 ret
= cmd_create_session_uri(name
, NULL
, 0, creds
, 0);
2661 if (ret
!= LTTNG_OK
) {
2665 /* Get the newly created session pointer back. This should NEVER fail. */
2666 session
= session_find_by_name(name
);
2669 /* Flag session for snapshot mode. */
2670 session
->snapshot_mode
= 1;
2672 /* Skip snapshot output creation if no URI is given. */
2677 new_output
= snapshot_output_alloc();
2679 ret
= LTTNG_ERR_NOMEM
;
2680 goto error_snapshot_alloc
;
2683 ret
= snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE
, NULL
,
2684 uris
, nb_uri
, session
->consumer
, new_output
, &session
->snapshot
);
2686 if (ret
== -ENOMEM
) {
2687 ret
= LTTNG_ERR_NOMEM
;
2689 ret
= LTTNG_ERR_INVALID
;
2691 goto error_snapshot
;
2695 snapshot_add_output(&session
->snapshot
, new_output
);
2702 snapshot_output_destroy(new_output
);
2703 error_snapshot_alloc
:
2704 session_destroy(session
);
2710 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2712 * Called with session lock held.
2714 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
2717 struct ltt_ust_session
*usess
;
2718 struct ltt_kernel_session
*ksess
;
2723 usess
= session
->ust_session
;
2724 ksess
= session
->kernel_session
;
2726 /* Clean kernel session teardown */
2727 kernel_destroy_session(ksess
);
2729 /* UST session teardown */
2731 /* Close any relayd session */
2732 consumer_output_send_destroy_relayd(usess
->consumer
);
2734 /* Destroy every UST application related to this session. */
2735 ret
= ust_app_destroy_trace_all(usess
);
2737 ERR("Error in ust_app_destroy_trace_all");
2740 /* Clean up the rest. */
2741 trace_ust_destroy_session(usess
);
2745 * Must notify the kernel thread here to update it's poll set in order to
2746 * remove the channel(s)' fd just destroyed.
2748 ret
= notify_thread_pipe(wpipe
);
2750 PERROR("write kernel poll pipe");
2753 ret
= session_destroy(session
);
2759 * Command LTTNG_CALIBRATE processed by the client thread.
2761 int cmd_calibrate(enum lttng_domain_type domain
,
2762 struct lttng_calibrate
*calibrate
)
2767 case LTTNG_DOMAIN_KERNEL
:
2769 struct lttng_kernel_calibrate kcalibrate
;
2771 switch (calibrate
->type
) {
2772 case LTTNG_CALIBRATE_FUNCTION
:
2774 /* Default and only possible calibrate option. */
2775 kcalibrate
.type
= LTTNG_KERNEL_CALIBRATE_KRETPROBE
;
2779 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2781 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
2786 case LTTNG_DOMAIN_UST
:
2788 struct lttng_ust_calibrate ucalibrate
;
2790 switch (calibrate
->type
) {
2791 case LTTNG_CALIBRATE_FUNCTION
:
2793 /* Default and only possible calibrate option. */
2794 ucalibrate
.type
= LTTNG_UST_CALIBRATE_TRACEPOINT
;
2798 ret
= ust_app_calibrate_glb(&ucalibrate
);
2800 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
2806 ret
= LTTNG_ERR_UND
;
2817 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2819 int cmd_register_consumer(struct ltt_session
*session
,
2820 enum lttng_domain_type domain
, const char *sock_path
,
2821 struct consumer_data
*cdata
)
2824 struct consumer_socket
*socket
= NULL
;
2831 case LTTNG_DOMAIN_KERNEL
:
2833 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2837 /* Can't register a consumer if there is already one */
2838 if (ksess
->consumer_fds_sent
!= 0) {
2839 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2843 sock
= lttcomm_connect_unix_sock(sock_path
);
2845 ret
= LTTNG_ERR_CONNECT_FAIL
;
2848 cdata
->cmd_sock
= sock
;
2850 socket
= consumer_allocate_socket(&cdata
->cmd_sock
);
2851 if (socket
== NULL
) {
2854 PERROR("close register consumer");
2856 cdata
->cmd_sock
= -1;
2857 ret
= LTTNG_ERR_FATAL
;
2861 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
2862 if (socket
->lock
== NULL
) {
2863 PERROR("zmalloc pthread mutex");
2864 ret
= LTTNG_ERR_FATAL
;
2867 pthread_mutex_init(socket
->lock
, NULL
);
2868 socket
->registered
= 1;
2871 consumer_add_socket(socket
, ksess
->consumer
);
2874 pthread_mutex_lock(&cdata
->pid_mutex
);
2876 pthread_mutex_unlock(&cdata
->pid_mutex
);
2881 /* TODO: Userspace tracing */
2882 ret
= LTTNG_ERR_UND
;
2890 consumer_destroy_socket(socket
);
2896 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2898 ssize_t
cmd_list_domains(struct ltt_session
*session
,
2899 struct lttng_domain
**domains
)
2904 struct lttng_ht_iter iter
;
2906 if (session
->kernel_session
!= NULL
) {
2907 DBG3("Listing domains found kernel domain");
2911 if (session
->ust_session
!= NULL
) {
2912 DBG3("Listing domains found UST global domain");
2916 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
2918 if (agt
->being_used
) {
2929 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2930 if (*domains
== NULL
) {
2931 ret
= LTTNG_ERR_FATAL
;
2935 if (session
->kernel_session
!= NULL
) {
2936 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2938 /* Kernel session buffer type is always GLOBAL */
2939 (*domains
)[index
].buf_type
= LTTNG_BUFFER_GLOBAL
;
2944 if (session
->ust_session
!= NULL
) {
2945 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2946 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2950 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
2952 if (agt
->being_used
) {
2953 (*domains
)[index
].type
= agt
->domain
;
2954 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2964 /* Return negative value to differentiate return code */
2970 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2972 ssize_t
cmd_list_channels(enum lttng_domain_type domain
,
2973 struct ltt_session
*session
, struct lttng_channel
**channels
)
2975 ssize_t nb_chan
= 0, payload_size
= 0, ret
;
2978 case LTTNG_DOMAIN_KERNEL
:
2979 if (session
->kernel_session
!= NULL
) {
2980 nb_chan
= session
->kernel_session
->channel_count
;
2982 DBG3("Number of kernel channels %zd", nb_chan
);
2984 ret
= -LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2988 case LTTNG_DOMAIN_UST
:
2989 if (session
->ust_session
!= NULL
) {
2991 nb_chan
= lttng_ht_get_count(
2992 session
->ust_session
->domain_global
.channels
);
2995 DBG3("Number of UST global channels %zd", nb_chan
);
2997 ret
= -LTTNG_ERR_UST_CHAN_NOT_FOUND
;
3002 ret
= -LTTNG_ERR_UND
;
3007 const size_t channel_size
= sizeof(struct lttng_channel
) +
3008 sizeof(struct lttcomm_channel_extended
);
3009 struct lttcomm_channel_extended
*channel_exts
;
3011 payload_size
= nb_chan
* channel_size
;
3012 *channels
= zmalloc(payload_size
);
3013 if (*channels
== NULL
) {
3014 ret
= -LTTNG_ERR_FATAL
;
3018 channel_exts
= ((void *) *channels
) +
3019 (nb_chan
* sizeof(struct lttng_channel
));
3020 list_lttng_channels(domain
, session
, *channels
, channel_exts
);
3031 * Command LTTNG_LIST_EVENTS processed by the client thread.
3033 ssize_t
cmd_list_events(enum lttng_domain_type domain
,
3034 struct ltt_session
*session
, char *channel_name
,
3035 struct lttng_event
**events
, size_t *total_size
)
3038 ssize_t nb_event
= 0;
3041 case LTTNG_DOMAIN_KERNEL
:
3042 if (session
->kernel_session
!= NULL
) {
3043 nb_event
= list_lttng_kernel_events(channel_name
,
3044 session
->kernel_session
, events
,
3048 case LTTNG_DOMAIN_UST
:
3050 if (session
->ust_session
!= NULL
) {
3051 nb_event
= list_lttng_ust_global_events(channel_name
,
3052 &session
->ust_session
->domain_global
, events
,
3057 case LTTNG_DOMAIN_LOG4J
:
3058 case LTTNG_DOMAIN_JUL
:
3059 case LTTNG_DOMAIN_PYTHON
:
3060 if (session
->ust_session
) {
3061 struct lttng_ht_iter iter
;
3065 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
,
3066 &iter
.iter
, agt
, node
.node
) {
3067 if (agt
->domain
== domain
) {
3068 nb_event
= list_lttng_agent_events(
3078 ret
= LTTNG_ERR_UND
;
3085 /* Return negative value to differentiate return code */
3090 * Using the session list, filled a lttng_session array to send back to the
3091 * client for session listing.
3093 * The session list lock MUST be acquired before calling this function. Use
3094 * session_lock_list() and session_unlock_list().
3096 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
3101 struct ltt_session
*session
;
3102 struct ltt_session_list
*list
= session_get_list();
3104 DBG("Getting all available session for UID %d GID %d",
3107 * Iterate over session list and append data after the control struct in
3110 cds_list_for_each_entry(session
, &list
->head
, list
) {
3112 * Only list the sessions the user can control.
3114 if (!session_access_ok(session
, uid
, gid
)) {
3118 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3119 struct ltt_ust_session
*usess
= session
->ust_session
;
3121 if (session
->consumer
->type
== CONSUMER_DST_NET
||
3122 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
3123 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
3124 ret
= build_network_session_path(sessions
[i
].path
,
3125 sizeof(sessions
[i
].path
), session
);
3127 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
3128 session
->consumer
->dst
.trace_path
);
3131 PERROR("snprintf session path");
3135 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
3136 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
3137 sessions
[i
].enabled
= session
->active
;
3138 sessions
[i
].snapshot_mode
= session
->snapshot_mode
;
3139 sessions
[i
].live_timer_interval
= session
->live_timer
;
3145 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
3146 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
3148 int cmd_data_pending(struct ltt_session
*session
)
3151 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3152 struct ltt_ust_session
*usess
= session
->ust_session
;
3156 /* Session MUST be stopped to ask for data availability. */
3157 if (session
->active
) {
3158 ret
= LTTNG_ERR_SESSION_STARTED
;
3162 * If stopped, just make sure we've started before else the above call
3163 * will always send that there is data pending.
3165 * The consumer assumes that when the data pending command is received,
3166 * the trace has been started before or else no output data is written
3167 * by the streams which is a condition for data pending. So, this is
3168 * *VERY* important that we don't ask the consumer before a start
3171 if (!session
->has_been_started
) {
3177 if (ksess
&& ksess
->consumer
) {
3178 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
3180 /* Data is still being extracted for the kernel. */
3185 if (usess
&& usess
->consumer
) {
3186 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
3188 /* Data is still being extracted for the kernel. */
3193 /* Data is ready to be read by a viewer */
3201 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
3203 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3205 int cmd_snapshot_add_output(struct ltt_session
*session
,
3206 struct lttng_snapshot_output
*output
, uint32_t *id
)
3209 struct snapshot_output
*new_output
;
3214 DBG("Cmd snapshot add output for session %s", session
->name
);
3217 * Permission denied to create an output if the session is not
3218 * set in no output mode.
3220 if (session
->output_traces
) {
3221 ret
= LTTNG_ERR_EPERM
;
3225 /* Only one output is allowed until we have the "tee" feature. */
3226 if (session
->snapshot
.nb_output
== 1) {
3227 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
3231 new_output
= snapshot_output_alloc();
3233 ret
= LTTNG_ERR_NOMEM
;
3237 ret
= snapshot_output_init(output
->max_size
, output
->name
,
3238 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
3239 &session
->snapshot
);
3241 if (ret
== -ENOMEM
) {
3242 ret
= LTTNG_ERR_NOMEM
;
3244 ret
= LTTNG_ERR_INVALID
;
3250 snapshot_add_output(&session
->snapshot
, new_output
);
3252 *id
= new_output
->id
;
3259 snapshot_output_destroy(new_output
);
3265 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
3267 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3269 int cmd_snapshot_del_output(struct ltt_session
*session
,
3270 struct lttng_snapshot_output
*output
)
3273 struct snapshot_output
*sout
= NULL
;
3281 * Permission denied to create an output if the session is not
3282 * set in no output mode.
3284 if (session
->output_traces
) {
3285 ret
= LTTNG_ERR_EPERM
;
3290 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
3292 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
3293 } else if (*output
->name
!= '\0') {
3294 DBG("Cmd snapshot del output name %s for session %s", output
->name
,
3296 sout
= snapshot_find_output_by_name(output
->name
, &session
->snapshot
);
3299 ret
= LTTNG_ERR_INVALID
;
3303 snapshot_delete_output(&session
->snapshot
, sout
);
3304 snapshot_output_destroy(sout
);
3313 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
3315 * If no output is available, outputs is untouched and 0 is returned.
3317 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
3319 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
3320 struct lttng_snapshot_output
**outputs
)
3323 struct lttng_snapshot_output
*list
= NULL
;
3324 struct lttng_ht_iter iter
;
3325 struct snapshot_output
*output
;
3330 DBG("Cmd snapshot list outputs for session %s", session
->name
);
3333 * Permission denied to create an output if the session is not
3334 * set in no output mode.
3336 if (session
->output_traces
) {
3337 ret
= -LTTNG_ERR_EPERM
;
3341 if (session
->snapshot
.nb_output
== 0) {
3346 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
3348 ret
= -LTTNG_ERR_NOMEM
;
3352 /* Copy list from session to the new list object. */
3354 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
3355 output
, node
.node
) {
3356 assert(output
->consumer
);
3357 list
[idx
].id
= output
->id
;
3358 list
[idx
].max_size
= output
->max_size
;
3359 if (lttng_strncpy(list
[idx
].name
, output
->name
,
3360 sizeof(list
[idx
].name
))) {
3361 ret
= -LTTNG_ERR_INVALID
;
3364 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
3365 if (lttng_strncpy(list
[idx
].ctrl_url
,
3366 output
->consumer
->dst
.trace_path
,
3367 sizeof(list
[idx
].ctrl_url
))) {
3368 ret
= -LTTNG_ERR_INVALID
;
3373 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
3374 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
3376 ret
= -LTTNG_ERR_NOMEM
;
3381 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
3382 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
3384 ret
= -LTTNG_ERR_NOMEM
;
3393 ret
= session
->snapshot
.nb_output
;
3401 * Check if we can regenerate the metadata for this session.
3402 * Only kernel, UST per-uid and non-live sessions are supported.
3404 * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise.
3407 int check_metadata_regenerate_support(struct ltt_session
*session
)
3413 if (session
->live_timer
!= 0) {
3414 ret
= LTTNG_ERR_LIVE_SESSION
;
3417 if (!session
->active
) {
3418 ret
= LTTNG_ERR_SESSION_NOT_STARTED
;
3421 if (session
->ust_session
) {
3422 switch (session
->ust_session
->buffer_type
) {
3423 case LTTNG_BUFFER_PER_UID
:
3425 case LTTNG_BUFFER_PER_PID
:
3426 ret
= LTTNG_ERR_PER_PID_SESSION
;
3430 ret
= LTTNG_ERR_UNK
;
3434 if (session
->consumer
->type
== CONSUMER_DST_NET
&&
3435 session
->consumer
->relay_minor_version
< 8) {
3436 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
3446 int ust_metadata_regenerate(struct ltt_ust_session
*usess
)
3449 struct buffer_reg_uid
*uid_reg
= NULL
;
3450 struct buffer_reg_session
*session_reg
= NULL
;
3453 cds_list_for_each_entry(uid_reg
, &usess
->buffer_reg_uid_list
, lnode
) {
3454 struct ust_registry_session
*registry
;
3455 struct ust_registry_channel
*chan
;
3456 struct lttng_ht_iter iter_chan
;
3458 session_reg
= uid_reg
->registry
;
3459 registry
= session_reg
->reg
.ust
;
3461 pthread_mutex_lock(®istry
->lock
);
3462 registry
->metadata_len_sent
= 0;
3463 memset(registry
->metadata
, 0, registry
->metadata_alloc_len
);
3464 registry
->metadata_len
= 0;
3465 registry
->metadata_version
++;
3466 ret
= ust_metadata_session_statedump(registry
, NULL
,
3467 registry
->major
, registry
->minor
);
3469 pthread_mutex_unlock(®istry
->lock
);
3470 ERR("Failed to generate session metadata (err = %d)",
3474 cds_lfht_for_each_entry(registry
->channels
->ht
, &iter_chan
.iter
,
3476 struct ust_registry_event
*event
;
3477 struct lttng_ht_iter iter_event
;
3479 ret
= ust_metadata_channel_statedump(registry
, chan
);
3481 pthread_mutex_unlock(®istry
->lock
);
3482 ERR("Failed to generate channel metadata "
3486 cds_lfht_for_each_entry(chan
->ht
->ht
, &iter_event
.iter
,
3488 ret
= ust_metadata_event_statedump(registry
,
3491 pthread_mutex_unlock(®istry
->lock
);
3492 ERR("Failed to generate event metadata "
3498 pthread_mutex_unlock(®istry
->lock
);
3507 * Command LTTNG_METADATA_REGENERATE from the lttng-ctl library.
3509 * Ask the consumer to truncate the existing metadata file(s) and
3510 * then regenerate the metadata. Live and per-pid sessions are not
3511 * supported and return an error.
3513 * Return 0 on success or else a LTTNG_ERR code.
3515 int cmd_metadata_regenerate(struct ltt_session
*session
)
3521 ret
= check_metadata_regenerate_support(session
);
3526 if (session
->kernel_session
) {
3527 ret
= kernctl_session_metadata_regenerate(
3528 session
->kernel_session
->fd
);
3530 ERR("Failed to regenerate the kernel metadata");
3535 if (session
->ust_session
) {
3536 ret
= ust_metadata_regenerate(session
->ust_session
);
3538 ERR("Failed to regenerate the UST metadata");
3542 DBG("Cmd metadata regenerate for session %s", session
->name
);
3551 * Send relayd sockets from snapshot output to consumer. Ignore request if the
3552 * snapshot output is *not* set with a remote destination.
3554 * Return 0 on success or a LTTNG_ERR code.
3556 static int set_relayd_for_snapshot(struct consumer_output
*consumer
,
3557 struct snapshot_output
*snap_output
, struct ltt_session
*session
)
3560 struct lttng_ht_iter iter
;
3561 struct consumer_socket
*socket
;
3564 assert(snap_output
);
3567 DBG2("Set relayd object from snapshot output");
3569 /* Ignore if snapshot consumer output is not network. */
3570 if (snap_output
->consumer
->type
!= CONSUMER_DST_NET
) {
3575 * For each consumer socket, create and send the relayd object of the
3579 cds_lfht_for_each_entry(snap_output
->consumer
->socks
->ht
, &iter
.iter
,
3580 socket
, node
.node
) {
3581 ret
= send_consumer_relayd_sockets(0, session
->id
,
3582 snap_output
->consumer
, socket
,
3583 session
->name
, session
->hostname
,
3584 session
->live_timer
);
3585 if (ret
!= LTTNG_OK
) {
3597 * Record a kernel snapshot.
3599 * Return LTTNG_OK on success or a LTTNG_ERR code.
3601 static int record_kernel_snapshot(struct ltt_kernel_session
*ksess
,
3602 struct snapshot_output
*output
, struct ltt_session
*session
,
3603 int wait
, uint64_t nb_packets_per_stream
)
3613 * Copy kernel session sockets so we can communicate with the right
3614 * consumer for the snapshot record command.
3616 ret
= consumer_copy_sockets(output
->consumer
, ksess
->consumer
);
3618 ret
= LTTNG_ERR_NOMEM
;
3622 ret
= set_relayd_for_snapshot(ksess
->consumer
, output
, session
);
3623 if (ret
!= LTTNG_OK
) {
3624 goto error_snapshot
;
3627 ret
= kernel_snapshot_record(ksess
, output
, wait
, nb_packets_per_stream
);
3628 if (ret
!= LTTNG_OK
) {
3629 goto error_snapshot
;
3636 /* Clean up copied sockets so this output can use some other later on. */
3637 consumer_destroy_output_sockets(output
->consumer
);
3644 * Record a UST snapshot.
3646 * Return 0 on success or a LTTNG_ERR error code.
3648 static int record_ust_snapshot(struct ltt_ust_session
*usess
,
3649 struct snapshot_output
*output
, struct ltt_session
*session
,
3650 int wait
, uint64_t nb_packets_per_stream
)
3659 * Copy UST session sockets so we can communicate with the right
3660 * consumer for the snapshot record command.
3662 ret
= consumer_copy_sockets(output
->consumer
, usess
->consumer
);
3664 ret
= LTTNG_ERR_NOMEM
;
3668 ret
= set_relayd_for_snapshot(usess
->consumer
, output
, session
);
3669 if (ret
!= LTTNG_OK
) {
3670 goto error_snapshot
;
3673 ret
= ust_app_snapshot_record(usess
, output
, wait
, nb_packets_per_stream
);
3677 ret
= LTTNG_ERR_INVALID
;
3680 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
3683 goto error_snapshot
;
3689 /* Clean up copied sockets so this output can use some other later on. */
3690 consumer_destroy_output_sockets(output
->consumer
);
3696 uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session
*session
,
3697 uint64_t cur_nr_packets
)
3699 uint64_t tot_size
= 0;
3701 if (session
->kernel_session
) {
3702 struct ltt_kernel_channel
*chan
;
3703 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3705 cds_list_for_each_entry(chan
, &ksess
->channel_list
.head
, list
) {
3706 if (cur_nr_packets
>= chan
->channel
->attr
.num_subbuf
) {
3708 * Don't take channel into account if we
3709 * already grab all its packets.
3713 tot_size
+= chan
->channel
->attr
.subbuf_size
3714 * chan
->stream_count
;
3718 if (session
->ust_session
) {
3719 struct ltt_ust_session
*usess
= session
->ust_session
;
3721 tot_size
+= ust_app_get_size_one_more_packet_per_stream(usess
,
3729 * Calculate the number of packets we can grab from each stream that
3730 * fits within the overall snapshot max size.
3732 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
3733 * the number of packets per stream.
3735 * TODO: this approach is not perfect: we consider the worse case
3736 * (packet filling the sub-buffers) as an upper bound, but we could do
3737 * better if we do this calculation while we actually grab the packet
3738 * content: we would know how much padding we don't actually store into
3741 * This algorithm is currently bounded by the number of packets per
3744 * Since we call this algorithm before actually grabbing the data, it's
3745 * an approximation: for instance, applications could appear/disappear
3746 * in between this call and actually grabbing data.
3749 int64_t get_session_nb_packets_per_stream(struct ltt_session
*session
, uint64_t max_size
)
3752 uint64_t cur_nb_packets
= 0;
3755 return 0; /* Infinite */
3758 size_left
= max_size
;
3760 uint64_t one_more_packet_tot_size
;
3762 one_more_packet_tot_size
= get_session_size_one_more_packet_per_stream(session
,
3764 if (!one_more_packet_tot_size
) {
3765 /* We are already grabbing all packets. */
3768 size_left
-= one_more_packet_tot_size
;
3769 if (size_left
< 0) {
3774 if (!cur_nb_packets
) {
3775 /* Not enough room to grab one packet of each stream, error. */
3778 return cur_nb_packets
;
3782 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3784 * The wait parameter is ignored so this call always wait for the snapshot to
3785 * complete before returning.
3787 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3789 int cmd_snapshot_record(struct ltt_session
*session
,
3790 struct lttng_snapshot_output
*output
, int wait
)
3793 unsigned int use_tmp_output
= 0;
3794 struct snapshot_output tmp_output
;
3795 unsigned int snapshot_success
= 0;
3801 DBG("Cmd snapshot record for session %s", session
->name
);
3803 /* Get the datetime for the snapshot output directory. */
3804 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", datetime
,
3807 ret
= LTTNG_ERR_INVALID
;
3812 * Permission denied to create an output if the session is not
3813 * set in no output mode.
3815 if (session
->output_traces
) {
3816 ret
= LTTNG_ERR_EPERM
;
3820 /* The session needs to be started at least once. */
3821 if (!session
->has_been_started
) {
3822 ret
= LTTNG_ERR_START_SESSION_ONCE
;
3826 /* Use temporary output for the session. */
3827 if (*output
->ctrl_url
!= '\0') {
3828 ret
= snapshot_output_init(output
->max_size
, output
->name
,
3829 output
->ctrl_url
, output
->data_url
, session
->consumer
,
3832 if (ret
== -ENOMEM
) {
3833 ret
= LTTNG_ERR_NOMEM
;
3835 ret
= LTTNG_ERR_INVALID
;
3839 /* Use the global session count for the temporary snapshot. */
3840 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3842 /* Use the global datetime */
3843 memcpy(tmp_output
.datetime
, datetime
, sizeof(datetime
));
3847 if (use_tmp_output
) {
3848 int64_t nb_packets_per_stream
;
3850 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
3851 tmp_output
.max_size
);
3852 if (nb_packets_per_stream
< 0) {
3853 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3857 if (session
->kernel_session
) {
3858 ret
= record_kernel_snapshot(session
->kernel_session
,
3859 &tmp_output
, session
,
3860 wait
, nb_packets_per_stream
);
3861 if (ret
!= LTTNG_OK
) {
3866 if (session
->ust_session
) {
3867 ret
= record_ust_snapshot(session
->ust_session
,
3868 &tmp_output
, session
,
3869 wait
, nb_packets_per_stream
);
3870 if (ret
!= LTTNG_OK
) {
3875 snapshot_success
= 1;
3877 struct snapshot_output
*sout
;
3878 struct lttng_ht_iter iter
;
3881 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
3882 &iter
.iter
, sout
, node
.node
) {
3883 int64_t nb_packets_per_stream
;
3886 * Make a local copy of the output and assign the possible
3887 * temporary value given by the caller.
3889 memset(&tmp_output
, 0, sizeof(tmp_output
));
3890 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
3892 if (output
->max_size
!= (uint64_t) -1ULL) {
3893 tmp_output
.max_size
= output
->max_size
;
3896 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
3897 tmp_output
.max_size
);
3898 if (nb_packets_per_stream
< 0) {
3899 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3904 /* Use temporary name. */
3905 if (*output
->name
!= '\0') {
3906 if (lttng_strncpy(tmp_output
.name
, output
->name
,
3907 sizeof(tmp_output
.name
))) {
3908 ret
= LTTNG_ERR_INVALID
;
3914 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3915 memcpy(tmp_output
.datetime
, datetime
, sizeof(datetime
));
3917 if (session
->kernel_session
) {
3918 ret
= record_kernel_snapshot(session
->kernel_session
,
3919 &tmp_output
, session
,
3920 wait
, nb_packets_per_stream
);
3921 if (ret
!= LTTNG_OK
) {
3927 if (session
->ust_session
) {
3928 ret
= record_ust_snapshot(session
->ust_session
,
3929 &tmp_output
, session
,
3930 wait
, nb_packets_per_stream
);
3931 if (ret
!= LTTNG_OK
) {
3936 snapshot_success
= 1;
3941 if (snapshot_success
) {
3942 session
->snapshot
.nb_snapshot
++;
3944 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
3952 * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
3954 int cmd_set_session_shm_path(struct ltt_session
*session
,
3955 const char *shm_path
)
3961 * Can only set shm path before session is started.
3963 if (session
->has_been_started
) {
3964 return LTTNG_ERR_SESSION_STARTED
;
3967 strncpy(session
->shm_path
, shm_path
,
3968 sizeof(session
->shm_path
));
3969 session
->shm_path
[sizeof(session
->shm_path
) - 1] = '\0';
3975 * Init command subsystem.
3980 * Set network sequence index to 1 for streams to match a relayd
3981 * socket on the consumer side.
3983 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
3984 relayd_net_seq_idx
= 1;
3985 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
3987 DBG("Command subsystem initialized");