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>
32 #include <common/string-utils/string-utils.h>
37 #include "health-sessiond.h"
39 #include "kernel-consumer.h"
40 #include "lttng-sessiond.h"
44 #include "buffer-registry.h"
49 * Used to keep a unique index for each relayd socket created where this value
50 * is associated with streams on the consumer so it can match the right relayd
51 * to send to. It must be accessed with the relayd_net_seq_idx_lock
54 static pthread_mutex_t relayd_net_seq_idx_lock
= PTHREAD_MUTEX_INITIALIZER
;
55 static uint64_t relayd_net_seq_idx
;
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 if (lttng_strncpy(channels
[i
].name
, uchan
->name
,
281 LTTNG_SYMBOL_NAME_LEN
)) {
284 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
285 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
286 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
287 channels
[i
].attr
.switch_timer_interval
=
288 uchan
->attr
.switch_timer_interval
;
289 channels
[i
].attr
.read_timer_interval
=
290 uchan
->attr
.read_timer_interval
;
291 channels
[i
].enabled
= uchan
->enabled
;
292 channels
[i
].attr
.tracefile_size
= uchan
->tracefile_size
;
293 channels
[i
].attr
.tracefile_count
= uchan
->tracefile_count
;
296 * Map enum lttng_ust_output to enum lttng_event_output.
298 switch (uchan
->attr
.output
) {
300 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
304 * LTTNG_UST_MMAP is the only supported UST
311 ret
= get_ust_runtime_stats(session
, uchan
,
312 &discarded_events
, &lost_packets
);
316 chan_exts
[i
].discarded_events
= discarded_events
;
317 chan_exts
[i
].lost_packets
= lost_packets
;
331 static void increment_extended_len(const char *filter_expression
,
332 struct lttng_event_exclusion
*exclusion
, size_t *extended_len
)
334 *extended_len
+= sizeof(struct lttcomm_event_extended_header
);
336 if (filter_expression
) {
337 *extended_len
+= strlen(filter_expression
) + 1;
341 *extended_len
+= exclusion
->count
* LTTNG_SYMBOL_NAME_LEN
;
345 static void append_extended_info(const char *filter_expression
,
346 struct lttng_event_exclusion
*exclusion
, void **extended_at
)
348 struct lttcomm_event_extended_header extended_header
;
349 size_t filter_len
= 0;
350 size_t nb_exclusions
= 0;
352 if (filter_expression
) {
353 filter_len
= strlen(filter_expression
) + 1;
357 nb_exclusions
= exclusion
->count
;
360 /* Set header fields */
361 extended_header
.filter_len
= filter_len
;
362 extended_header
.nb_exclusions
= nb_exclusions
;
365 memcpy(*extended_at
, &extended_header
, sizeof(extended_header
));
366 *extended_at
+= sizeof(extended_header
);
368 /* Copy filter string */
369 if (filter_expression
) {
370 memcpy(*extended_at
, filter_expression
, filter_len
);
371 *extended_at
+= filter_len
;
374 /* Copy exclusion names */
376 size_t len
= nb_exclusions
* LTTNG_SYMBOL_NAME_LEN
;
378 memcpy(*extended_at
, &exclusion
->names
, len
);
384 * Create a list of agent domain events.
386 * Return number of events in list on success or else a negative value.
388 static int list_lttng_agent_events(struct agent
*agt
,
389 struct lttng_event
**events
, size_t *total_size
)
392 unsigned int nb_event
= 0;
393 struct agent_event
*event
;
394 struct lttng_event
*tmp_events
;
395 struct lttng_ht_iter iter
;
396 size_t extended_len
= 0;
402 DBG3("Listing agent events");
405 nb_event
= lttng_ht_get_count(agt
->events
);
413 /* Compute required extended infos size */
414 extended_len
= nb_event
* sizeof(struct lttcomm_event_extended_header
);
417 * This is only valid because the commands which add events are
418 * processed in the same thread as the listing.
421 cds_lfht_for_each_entry(agt
->events
->ht
, &iter
.iter
, event
, node
.node
) {
422 increment_extended_len(event
->filter_expression
, NULL
,
427 *total_size
= nb_event
* sizeof(*tmp_events
) + extended_len
;
428 tmp_events
= zmalloc(*total_size
);
430 PERROR("zmalloc agent events session");
431 ret
= -LTTNG_ERR_FATAL
;
435 extended_at
= ((uint8_t *) tmp_events
) +
436 nb_event
* sizeof(struct lttng_event
);
439 cds_lfht_for_each_entry(agt
->events
->ht
, &iter
.iter
, event
, node
.node
) {
440 strncpy(tmp_events
[i
].name
, event
->name
, sizeof(tmp_events
[i
].name
));
441 tmp_events
[i
].name
[sizeof(tmp_events
[i
].name
) - 1] = '\0';
442 tmp_events
[i
].enabled
= event
->enabled
;
443 tmp_events
[i
].loglevel
= event
->loglevel_value
;
444 tmp_events
[i
].loglevel_type
= event
->loglevel_type
;
447 /* Append extended info */
448 append_extended_info(event
->filter_expression
, NULL
,
453 *events
= tmp_events
;
457 assert(nb_event
== i
);
462 * Create a list of ust global domain events.
464 static int list_lttng_ust_global_events(char *channel_name
,
465 struct ltt_ust_domain_global
*ust_global
,
466 struct lttng_event
**events
, size_t *total_size
)
469 unsigned int nb_event
= 0;
470 struct lttng_ht_iter iter
;
471 struct lttng_ht_node_str
*node
;
472 struct ltt_ust_channel
*uchan
;
473 struct ltt_ust_event
*uevent
;
474 struct lttng_event
*tmp
;
475 size_t extended_len
= 0;
478 DBG("Listing UST global events for channel %s", channel_name
);
482 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
483 node
= lttng_ht_iter_get_node_str(&iter
);
485 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
489 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
491 nb_event
= lttng_ht_get_count(uchan
->events
);
498 DBG3("Listing UST global %d events", nb_event
);
500 /* Compute required extended infos size */
501 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
502 if (uevent
->internal
) {
507 increment_extended_len(uevent
->filter_expression
,
508 uevent
->exclusion
, &extended_len
);
511 /* All events are internal, skip. */
517 *total_size
= nb_event
* sizeof(struct lttng_event
) + extended_len
;
518 tmp
= zmalloc(*total_size
);
520 ret
= -LTTNG_ERR_FATAL
;
524 extended_at
= ((uint8_t *) tmp
) + nb_event
* sizeof(struct lttng_event
);
526 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
527 if (uevent
->internal
) {
528 /* This event should remain hidden from clients */
531 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
532 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
533 tmp
[i
].enabled
= uevent
->enabled
;
535 switch (uevent
->attr
.instrumentation
) {
536 case LTTNG_UST_TRACEPOINT
:
537 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
539 case LTTNG_UST_PROBE
:
540 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
542 case LTTNG_UST_FUNCTION
:
543 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
547 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
548 switch (uevent
->attr
.loglevel_type
) {
549 case LTTNG_UST_LOGLEVEL_ALL
:
550 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
552 case LTTNG_UST_LOGLEVEL_RANGE
:
553 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
555 case LTTNG_UST_LOGLEVEL_SINGLE
:
556 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
559 if (uevent
->filter
) {
562 if (uevent
->exclusion
) {
563 tmp
[i
].exclusion
= 1;
567 /* Append extended info */
568 append_extended_info(uevent
->filter_expression
,
569 uevent
->exclusion
, &extended_at
);
580 * Fill lttng_event array of all kernel events in the channel.
582 static int list_lttng_kernel_events(char *channel_name
,
583 struct ltt_kernel_session
*kernel_session
,
584 struct lttng_event
**events
, size_t *total_size
)
587 unsigned int nb_event
;
588 struct ltt_kernel_event
*event
;
589 struct ltt_kernel_channel
*kchan
;
590 size_t extended_len
= 0;
593 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
595 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
599 nb_event
= kchan
->event_count
;
601 DBG("Listing events for channel %s", kchan
->channel
->name
);
609 /* Compute required extended infos size */
610 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
611 increment_extended_len(event
->filter_expression
, NULL
,
615 *total_size
= nb_event
* sizeof(struct lttng_event
) + extended_len
;
616 *events
= zmalloc(*total_size
);
617 if (*events
== NULL
) {
618 ret
= LTTNG_ERR_FATAL
;
622 extended_at
= ((void *) *events
) +
623 nb_event
* sizeof(struct lttng_event
);
625 /* Kernel channels */
626 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
627 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
628 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
629 (*events
)[i
].enabled
= event
->enabled
;
630 (*events
)[i
].filter
=
631 (unsigned char) !!event
->filter_expression
;
633 switch (event
->event
->instrumentation
) {
634 case LTTNG_KERNEL_TRACEPOINT
:
635 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
637 case LTTNG_KERNEL_KRETPROBE
:
638 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
639 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
640 sizeof(struct lttng_kernel_kprobe
));
642 case LTTNG_KERNEL_KPROBE
:
643 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
644 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
645 sizeof(struct lttng_kernel_kprobe
));
647 case LTTNG_KERNEL_FUNCTION
:
648 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
649 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
650 sizeof(struct lttng_kernel_function
));
652 case LTTNG_KERNEL_NOOP
:
653 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
655 case LTTNG_KERNEL_SYSCALL
:
656 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
658 case LTTNG_KERNEL_ALL
:
664 /* Append extended info */
665 append_extended_info(event
->filter_expression
, NULL
,
673 /* Negate the error code to differentiate the size from an error */
678 * Add URI so the consumer output object. Set the correct path depending on the
679 * domain adding the default trace directory.
681 static int add_uri_to_consumer(struct consumer_output
*consumer
,
682 struct lttng_uri
*uri
, enum lttng_domain_type domain
,
683 const char *session_name
)
686 const char *default_trace_dir
;
690 if (consumer
== NULL
) {
691 DBG("No consumer detected. Don't add URI. Stopping.");
692 ret
= LTTNG_ERR_NO_CONSUMER
;
697 case LTTNG_DOMAIN_KERNEL
:
698 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
700 case LTTNG_DOMAIN_UST
:
701 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
705 * This case is possible is we try to add the URI to the global tracing
706 * session consumer object which in this case there is no subdir.
708 default_trace_dir
= "";
711 switch (uri
->dtype
) {
714 DBG2("Setting network URI to consumer");
716 if (consumer
->type
== CONSUMER_DST_NET
) {
717 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
718 consumer
->dst
.net
.control_isset
) ||
719 (uri
->stype
== LTTNG_STREAM_DATA
&&
720 consumer
->dst
.net
.data_isset
)) {
721 ret
= LTTNG_ERR_URL_EXIST
;
725 memset(&consumer
->dst
.net
, 0, sizeof(consumer
->dst
.net
));
728 consumer
->type
= CONSUMER_DST_NET
;
730 /* Set URI into consumer output object */
731 ret
= consumer_set_network_uri(consumer
, uri
);
735 } else if (ret
== 1) {
737 * URI was the same in the consumer so we do not append the subdir
738 * again so to not duplicate output dir.
744 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
745 ret
= consumer_set_subdir(consumer
, session_name
);
747 ret
= LTTNG_ERR_FATAL
;
752 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
753 /* On a new subdir, reappend the default trace dir. */
754 strncat(consumer
->subdir
, default_trace_dir
,
755 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
756 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
761 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
762 memset(consumer
->dst
.trace_path
, 0,
763 sizeof(consumer
->dst
.trace_path
));
764 /* Explicit length checks for strcpy and strcat. */
765 if (strlen(uri
->dst
.path
) + strlen(default_trace_dir
)
766 >= sizeof(consumer
->dst
.trace_path
)) {
767 ret
= LTTNG_ERR_FATAL
;
770 strcpy(consumer
->dst
.trace_path
, uri
->dst
.path
);
771 /* Append default trace dir */
772 strcat(consumer
->dst
.trace_path
, default_trace_dir
);
773 /* Flag consumer as local. */
774 consumer
->type
= CONSUMER_DST_LOCAL
;
785 * Init tracing by creating trace directory and sending fds kernel consumer.
787 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
790 struct lttng_ht_iter iter
;
791 struct consumer_socket
*socket
;
797 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
798 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
800 pthread_mutex_lock(socket
->lock
);
801 ret
= kernel_consumer_send_session(socket
, session
);
802 pthread_mutex_unlock(socket
->lock
);
804 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
816 * Create a socket to the relayd using the URI.
818 * On success, the relayd_sock pointer is set to the created socket.
819 * Else, it's stays untouched and a lttcomm error code is returned.
821 static int create_connect_relayd(struct lttng_uri
*uri
,
822 struct lttcomm_relayd_sock
**relayd_sock
,
823 struct consumer_output
*consumer
)
826 struct lttcomm_relayd_sock
*rsock
;
828 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
829 RELAYD_VERSION_COMM_MINOR
);
831 ret
= LTTNG_ERR_FATAL
;
836 * Connect to relayd so we can proceed with a session creation. This call
837 * can possibly block for an arbitrary amount of time to set the health
838 * state to be in poll execution.
841 ret
= relayd_connect(rsock
);
844 ERR("Unable to reach lttng-relayd");
845 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
849 /* Create socket for control stream. */
850 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
851 DBG3("Creating relayd stream socket from URI");
853 /* Check relayd version */
854 ret
= relayd_version_check(rsock
);
856 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
859 consumer
->relay_major_version
= rsock
->major
;
860 consumer
->relay_minor_version
= rsock
->minor
;
861 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
862 DBG3("Creating relayd data socket from URI");
864 /* Command is not valid */
865 ERR("Relayd invalid stream type: %d", uri
->stype
);
866 ret
= LTTNG_ERR_INVALID
;
870 *relayd_sock
= rsock
;
875 /* The returned value is not useful since we are on an error path. */
876 (void) relayd_close(rsock
);
884 * Connect to the relayd using URI and send the socket to the right consumer.
886 static int send_consumer_relayd_socket(enum lttng_domain_type domain
,
887 unsigned int session_id
, struct lttng_uri
*relayd_uri
,
888 struct consumer_output
*consumer
,
889 struct consumer_socket
*consumer_sock
,
890 char *session_name
, char *hostname
, int session_live_timer
)
893 struct lttcomm_relayd_sock
*rsock
= NULL
;
895 /* Connect to relayd and make version check if uri is the control. */
896 ret
= create_connect_relayd(relayd_uri
, &rsock
, consumer
);
897 if (ret
!= LTTNG_OK
) {
902 /* Set the network sequence index if not set. */
903 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
904 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
906 * Increment net_seq_idx because we are about to transfer the
907 * new relayd socket to the consumer.
908 * Assign unique key so the consumer can match streams.
910 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
911 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
914 /* Send relayd socket to consumer. */
915 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
916 relayd_uri
->stype
, session_id
,
917 session_name
, hostname
, session_live_timer
);
919 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
923 /* Flag that the corresponding socket was sent. */
924 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
925 consumer_sock
->control_sock_sent
= 1;
926 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
927 consumer_sock
->data_sock_sent
= 1;
933 * Close socket which was dup on the consumer side. The session daemon does
934 * NOT keep track of the relayd socket(s) once transfer to the consumer.
938 (void) relayd_close(rsock
);
942 if (ret
!= LTTNG_OK
) {
944 * The consumer output for this session should not be used anymore
945 * since the relayd connection failed thus making any tracing or/and
946 * streaming not usable.
948 consumer
->enabled
= 0;
954 * Send both relayd sockets to a specific consumer and domain. This is a
955 * helper function to facilitate sending the information to the consumer for a
958 static int send_consumer_relayd_sockets(enum lttng_domain_type domain
,
959 unsigned int session_id
, struct consumer_output
*consumer
,
960 struct consumer_socket
*sock
, char *session_name
,
961 char *hostname
, int session_live_timer
)
968 /* Sending control relayd socket. */
969 if (!sock
->control_sock_sent
) {
970 ret
= send_consumer_relayd_socket(domain
, session_id
,
971 &consumer
->dst
.net
.control
, consumer
, sock
,
972 session_name
, hostname
, session_live_timer
);
973 if (ret
!= LTTNG_OK
) {
978 /* Sending data relayd socket. */
979 if (!sock
->data_sock_sent
) {
980 ret
= send_consumer_relayd_socket(domain
, session_id
,
981 &consumer
->dst
.net
.data
, consumer
, sock
,
982 session_name
, hostname
, session_live_timer
);
983 if (ret
!= LTTNG_OK
) {
993 * Setup relayd connections for a tracing session. First creates the socket to
994 * the relayd and send them to the right domain consumer. Consumer type MUST be
997 int cmd_setup_relayd(struct ltt_session
*session
)
1000 struct ltt_ust_session
*usess
;
1001 struct ltt_kernel_session
*ksess
;
1002 struct consumer_socket
*socket
;
1003 struct lttng_ht_iter iter
;
1007 usess
= session
->ust_session
;
1008 ksess
= session
->kernel_session
;
1010 DBG("Setting relayd for session %s", session
->name
);
1014 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
1015 && usess
->consumer
->enabled
) {
1016 /* For each consumer socket, send relayd sockets */
1017 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
1018 socket
, node
.node
) {
1019 pthread_mutex_lock(socket
->lock
);
1020 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
->id
,
1021 usess
->consumer
, socket
,
1022 session
->name
, session
->hostname
,
1023 session
->live_timer
);
1024 pthread_mutex_unlock(socket
->lock
);
1025 if (ret
!= LTTNG_OK
) {
1028 /* Session is now ready for network streaming. */
1029 session
->net_handle
= 1;
1031 session
->consumer
->relay_major_version
=
1032 usess
->consumer
->relay_major_version
;
1033 session
->consumer
->relay_minor_version
=
1034 usess
->consumer
->relay_minor_version
;
1037 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
1038 && ksess
->consumer
->enabled
) {
1039 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
1040 socket
, node
.node
) {
1041 pthread_mutex_lock(socket
->lock
);
1042 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
->id
,
1043 ksess
->consumer
, socket
,
1044 session
->name
, session
->hostname
,
1045 session
->live_timer
);
1046 pthread_mutex_unlock(socket
->lock
);
1047 if (ret
!= LTTNG_OK
) {
1050 /* Session is now ready for network streaming. */
1051 session
->net_handle
= 1;
1053 session
->consumer
->relay_major_version
=
1054 ksess
->consumer
->relay_major_version
;
1055 session
->consumer
->relay_minor_version
=
1056 ksess
->consumer
->relay_minor_version
;
1065 * Start a kernel session by opening all necessary streams.
1067 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
1070 struct ltt_kernel_channel
*kchan
;
1072 /* Open kernel metadata */
1073 if (ksess
->metadata
== NULL
&& ksess
->output_traces
) {
1074 ret
= kernel_open_metadata(ksess
);
1076 ret
= LTTNG_ERR_KERN_META_FAIL
;
1081 /* Open kernel metadata stream */
1082 if (ksess
->metadata
&& ksess
->metadata_stream_fd
< 0) {
1083 ret
= kernel_open_metadata_stream(ksess
);
1085 ERR("Kernel create metadata stream failed");
1086 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1091 /* For each channel */
1092 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
1093 if (kchan
->stream_count
== 0) {
1094 ret
= kernel_open_channel_stream(kchan
);
1096 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1099 /* Update the stream global counter */
1100 ksess
->stream_count_global
+= ret
;
1104 /* Setup kernel consumer socket and send fds to it */
1105 ret
= init_kernel_tracing(ksess
);
1107 ret
= LTTNG_ERR_KERN_START_FAIL
;
1111 /* This start the kernel tracing */
1112 ret
= kernel_start_session(ksess
);
1114 ret
= LTTNG_ERR_KERN_START_FAIL
;
1118 /* Quiescent wait after starting trace */
1119 kernel_wait_quiescent(kernel_tracer_fd
);
1130 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1132 int cmd_disable_channel(struct ltt_session
*session
,
1133 enum lttng_domain_type domain
, char *channel_name
)
1136 struct ltt_ust_session
*usess
;
1138 usess
= session
->ust_session
;
1143 case LTTNG_DOMAIN_KERNEL
:
1145 ret
= channel_kernel_disable(session
->kernel_session
,
1147 if (ret
!= LTTNG_OK
) {
1151 kernel_wait_quiescent(kernel_tracer_fd
);
1154 case LTTNG_DOMAIN_UST
:
1156 struct ltt_ust_channel
*uchan
;
1157 struct lttng_ht
*chan_ht
;
1159 chan_ht
= usess
->domain_global
.channels
;
1161 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
1162 if (uchan
== NULL
) {
1163 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1167 ret
= channel_ust_disable(usess
, uchan
);
1168 if (ret
!= LTTNG_OK
) {
1174 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1186 * Command LTTNG_TRACK_PID processed by the client thread.
1188 * Called with session lock held.
1190 int cmd_track_pid(struct ltt_session
*session
, enum lttng_domain_type domain
,
1198 case LTTNG_DOMAIN_KERNEL
:
1200 struct ltt_kernel_session
*ksess
;
1202 ksess
= session
->kernel_session
;
1204 ret
= kernel_track_pid(ksess
, pid
);
1205 if (ret
!= LTTNG_OK
) {
1209 kernel_wait_quiescent(kernel_tracer_fd
);
1212 case LTTNG_DOMAIN_UST
:
1214 struct ltt_ust_session
*usess
;
1216 usess
= session
->ust_session
;
1218 ret
= trace_ust_track_pid(usess
, pid
);
1219 if (ret
!= LTTNG_OK
) {
1225 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1237 * Command LTTNG_UNTRACK_PID processed by the client thread.
1239 * Called with session lock held.
1241 int cmd_untrack_pid(struct ltt_session
*session
, enum lttng_domain_type domain
,
1249 case LTTNG_DOMAIN_KERNEL
:
1251 struct ltt_kernel_session
*ksess
;
1253 ksess
= session
->kernel_session
;
1255 ret
= kernel_untrack_pid(ksess
, pid
);
1256 if (ret
!= LTTNG_OK
) {
1260 kernel_wait_quiescent(kernel_tracer_fd
);
1263 case LTTNG_DOMAIN_UST
:
1265 struct ltt_ust_session
*usess
;
1267 usess
= session
->ust_session
;
1269 ret
= trace_ust_untrack_pid(usess
, pid
);
1270 if (ret
!= LTTNG_OK
) {
1276 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1288 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1290 * The wpipe arguments is used as a notifier for the kernel thread.
1292 int cmd_enable_channel(struct ltt_session
*session
,
1293 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
1296 struct ltt_ust_session
*usess
= session
->ust_session
;
1297 struct lttng_ht
*chan_ht
;
1304 len
= lttng_strnlen(attr
->name
, sizeof(attr
->name
));
1306 /* Validate channel name */
1307 if (attr
->name
[0] == '.' ||
1308 memchr(attr
->name
, '/', len
) != NULL
) {
1309 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1313 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
1318 * Don't try to enable a channel if the session has been started at
1319 * some point in time before. The tracer does not allow it.
1321 if (session
->has_been_started
) {
1322 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1327 * If the session is a live session, remove the switch timer, the
1328 * live timer does the same thing but sends also synchronisation
1329 * beacons for inactive streams.
1331 if (session
->live_timer
> 0) {
1332 attr
->attr
.live_timer_interval
= session
->live_timer
;
1333 attr
->attr
.switch_timer_interval
= 0;
1336 switch (domain
->type
) {
1337 case LTTNG_DOMAIN_KERNEL
:
1339 struct ltt_kernel_channel
*kchan
;
1341 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
1342 session
->kernel_session
);
1343 if (kchan
== NULL
) {
1344 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
1345 if (attr
->name
[0] != '\0') {
1346 session
->kernel_session
->has_non_default_channel
= 1;
1349 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
1352 if (ret
!= LTTNG_OK
) {
1356 kernel_wait_quiescent(kernel_tracer_fd
);
1359 case LTTNG_DOMAIN_UST
:
1360 case LTTNG_DOMAIN_JUL
:
1361 case LTTNG_DOMAIN_LOG4J
:
1362 case LTTNG_DOMAIN_PYTHON
:
1364 struct ltt_ust_channel
*uchan
;
1369 * Current agent implementation limitations force us to allow
1370 * only one channel at once in "agent" subdomains. Each
1371 * subdomain has a default channel name which must be strictly
1374 if (domain
->type
== LTTNG_DOMAIN_JUL
) {
1375 if (strncmp(attr
->name
, DEFAULT_JUL_CHANNEL_NAME
,
1376 LTTNG_SYMBOL_NAME_LEN
)) {
1377 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1380 } else if (domain
->type
== LTTNG_DOMAIN_LOG4J
) {
1381 if (strncmp(attr
->name
, DEFAULT_LOG4J_CHANNEL_NAME
,
1382 LTTNG_SYMBOL_NAME_LEN
)) {
1383 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1386 } else if (domain
->type
== LTTNG_DOMAIN_PYTHON
) {
1387 if (strncmp(attr
->name
, DEFAULT_PYTHON_CHANNEL_NAME
,
1388 LTTNG_SYMBOL_NAME_LEN
)) {
1389 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1394 chan_ht
= usess
->domain_global
.channels
;
1396 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
1397 if (uchan
== NULL
) {
1398 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
1399 if (attr
->name
[0] != '\0') {
1400 usess
->has_non_default_channel
= 1;
1403 ret
= channel_ust_enable(usess
, uchan
);
1408 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1419 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1421 int cmd_disable_event(struct ltt_session
*session
,
1422 enum lttng_domain_type domain
, char *channel_name
,
1423 struct lttng_event
*event
)
1428 DBG("Disable event command for event \'%s\'", event
->name
);
1430 event_name
= event
->name
;
1432 /* Error out on unhandled search criteria */
1433 if (event
->loglevel_type
|| event
->loglevel
!= -1 || event
->enabled
1434 || event
->pid
|| event
->filter
|| event
->exclusion
) {
1435 ret
= LTTNG_ERR_UNK
;
1442 case LTTNG_DOMAIN_KERNEL
:
1444 struct ltt_kernel_channel
*kchan
;
1445 struct ltt_kernel_session
*ksess
;
1447 ksess
= session
->kernel_session
;
1450 * If a non-default channel has been created in the
1451 * session, explicitely require that -c chan_name needs
1454 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1455 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1459 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1460 if (kchan
== NULL
) {
1461 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1465 switch (event
->type
) {
1466 case LTTNG_EVENT_ALL
:
1467 case LTTNG_EVENT_TRACEPOINT
:
1468 case LTTNG_EVENT_SYSCALL
:
1469 case LTTNG_EVENT_PROBE
:
1470 case LTTNG_EVENT_FUNCTION
:
1471 case LTTNG_EVENT_FUNCTION_ENTRY
:/* fall-through */
1472 if (event_name
[0] == '\0') {
1473 ret
= event_kernel_disable_event(kchan
,
1476 ret
= event_kernel_disable_event(kchan
,
1477 event_name
, event
->type
);
1479 if (ret
!= LTTNG_OK
) {
1484 ret
= LTTNG_ERR_UNK
;
1488 kernel_wait_quiescent(kernel_tracer_fd
);
1491 case LTTNG_DOMAIN_UST
:
1493 struct ltt_ust_channel
*uchan
;
1494 struct ltt_ust_session
*usess
;
1496 usess
= session
->ust_session
;
1498 if (validate_ust_event_name(event_name
)) {
1499 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1504 * If a non-default channel has been created in the
1505 * session, explicitly require that -c chan_name needs
1508 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1509 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1513 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1515 if (uchan
== NULL
) {
1516 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1520 switch (event
->type
) {
1521 case LTTNG_EVENT_ALL
:
1523 * An empty event name means that everything
1524 * should be disabled.
1526 if (event
->name
[0] == '\0') {
1527 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1529 ret
= event_ust_disable_tracepoint(usess
, uchan
,
1532 if (ret
!= LTTNG_OK
) {
1537 ret
= LTTNG_ERR_UNK
;
1541 DBG3("Disable UST event %s in channel %s completed", event_name
,
1545 case LTTNG_DOMAIN_LOG4J
:
1546 case LTTNG_DOMAIN_JUL
:
1547 case LTTNG_DOMAIN_PYTHON
:
1550 struct ltt_ust_session
*usess
= session
->ust_session
;
1554 switch (event
->type
) {
1555 case LTTNG_EVENT_ALL
:
1558 ret
= LTTNG_ERR_UNK
;
1562 agt
= trace_ust_find_agent(usess
, domain
);
1564 ret
= -LTTNG_ERR_UST_EVENT_NOT_FOUND
;
1568 * An empty event name means that everything
1569 * should be disabled.
1571 if (event
->name
[0] == '\0') {
1572 ret
= event_agent_disable_all(usess
, agt
);
1574 ret
= event_agent_disable(usess
, agt
, event_name
);
1576 if (ret
!= LTTNG_OK
) {
1583 ret
= LTTNG_ERR_UND
;
1596 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1598 int cmd_add_context(struct ltt_session
*session
, enum lttng_domain_type domain
,
1599 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1601 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1602 char *app_ctx_provider_name
= NULL
, *app_ctx_name
= NULL
;
1604 if (ctx
->ctx
== LTTNG_EVENT_CONTEXT_APP_CONTEXT
) {
1605 app_ctx_provider_name
= ctx
->u
.app_ctx
.provider_name
;
1606 app_ctx_name
= ctx
->u
.app_ctx
.ctx_name
;
1610 case LTTNG_DOMAIN_KERNEL
:
1611 assert(session
->kernel_session
);
1613 if (session
->kernel_session
->channel_count
== 0) {
1614 /* Create default channel */
1615 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1616 if (ret
!= LTTNG_OK
) {
1619 chan_kern_created
= 1;
1621 /* Add kernel context to kernel tracer */
1622 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1623 if (ret
!= LTTNG_OK
) {
1627 case LTTNG_DOMAIN_JUL
:
1628 case LTTNG_DOMAIN_LOG4J
:
1631 * Validate channel name.
1632 * If no channel name is given and the domain is JUL or LOG4J,
1633 * set it to the appropriate domain-specific channel name. If
1634 * a name is provided but does not match the expexted channel
1635 * name, return an error.
1637 if (domain
== LTTNG_DOMAIN_JUL
&& *channel_name
&&
1638 strcmp(channel_name
,
1639 DEFAULT_JUL_CHANNEL_NAME
)) {
1640 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1642 } else if (domain
== LTTNG_DOMAIN_LOG4J
&& *channel_name
&&
1643 strcmp(channel_name
,
1644 DEFAULT_LOG4J_CHANNEL_NAME
)) {
1645 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1648 /* break is _not_ missing here. */
1650 case LTTNG_DOMAIN_UST
:
1652 struct ltt_ust_session
*usess
= session
->ust_session
;
1653 unsigned int chan_count
;
1657 chan_count
= lttng_ht_get_count(usess
->domain_global
.channels
);
1658 if (chan_count
== 0) {
1659 struct lttng_channel
*attr
;
1660 /* Create default channel */
1661 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1663 ret
= LTTNG_ERR_FATAL
;
1667 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1668 if (ret
!= LTTNG_OK
) {
1673 chan_ust_created
= 1;
1676 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1677 free(app_ctx_provider_name
);
1679 app_ctx_name
= NULL
;
1680 app_ctx_provider_name
= NULL
;
1681 if (ret
!= LTTNG_OK
) {
1687 ret
= LTTNG_ERR_UND
;
1695 if (chan_kern_created
) {
1696 struct ltt_kernel_channel
*kchan
=
1697 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1698 session
->kernel_session
);
1699 /* Created previously, this should NOT fail. */
1701 kernel_destroy_channel(kchan
);
1704 if (chan_ust_created
) {
1705 struct ltt_ust_channel
*uchan
=
1706 trace_ust_find_channel_by_name(
1707 session
->ust_session
->domain_global
.channels
,
1708 DEFAULT_CHANNEL_NAME
);
1709 /* Created previously, this should NOT fail. */
1711 /* Remove from the channel list of the session. */
1712 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1714 trace_ust_destroy_channel(uchan
);
1717 free(app_ctx_provider_name
);
1722 static inline bool name_starts_with(const char *name
, const char *prefix
)
1724 const size_t max_cmp_len
= min(strlen(prefix
), LTTNG_SYMBOL_NAME_LEN
);
1726 return !strncmp(name
, prefix
, max_cmp_len
);
1729 /* Perform userspace-specific event name validation */
1730 static int validate_ust_event_name(const char *name
)
1740 * Check name against all internal UST event component namespaces used
1743 if (name_starts_with(name
, DEFAULT_JUL_EVENT_COMPONENT
) ||
1744 name_starts_with(name
, DEFAULT_LOG4J_EVENT_COMPONENT
) ||
1745 name_starts_with(name
, DEFAULT_PYTHON_EVENT_COMPONENT
)) {
1754 * Internal version of cmd_enable_event() with a supplemental
1755 * "internal_event" flag which is used to enable internal events which should
1756 * be hidden from clients. Such events are used in the agent implementation to
1757 * enable the events through which all "agent" events are funeled.
1759 static int _cmd_enable_event(struct ltt_session
*session
,
1760 struct lttng_domain
*domain
,
1761 char *channel_name
, struct lttng_event
*event
,
1762 char *filter_expression
,
1763 struct lttng_filter_bytecode
*filter
,
1764 struct lttng_event_exclusion
*exclusion
,
1765 int wpipe
, bool internal_event
)
1767 int ret
= 0, channel_created
= 0;
1768 struct lttng_channel
*attr
= NULL
;
1772 assert(channel_name
);
1774 /* If we have a filter, we must have its filter expression */
1775 assert(!(!!filter_expression
^ !!filter
));
1777 /* Normalize event name as a globbing pattern */
1778 strutils_normalize_star_glob_pattern(event
->name
);
1780 /* Normalize exclusion names as globbing patterns */
1784 for (i
= 0; i
< exclusion
->count
; i
++) {
1785 char *name
= LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion
, i
);
1787 strutils_normalize_star_glob_pattern(name
);
1791 DBG("Enable event command for event \'%s\'", event
->name
);
1795 switch (domain
->type
) {
1796 case LTTNG_DOMAIN_KERNEL
:
1798 struct ltt_kernel_channel
*kchan
;
1801 * If a non-default channel has been created in the
1802 * session, explicitely require that -c chan_name needs
1805 if (session
->kernel_session
->has_non_default_channel
1806 && channel_name
[0] == '\0') {
1807 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1811 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1812 session
->kernel_session
);
1813 if (kchan
== NULL
) {
1814 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1815 LTTNG_BUFFER_GLOBAL
);
1817 ret
= LTTNG_ERR_FATAL
;
1820 if (lttng_strncpy(attr
->name
, channel_name
,
1821 sizeof(attr
->name
))) {
1822 ret
= LTTNG_ERR_INVALID
;
1826 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1827 if (ret
!= LTTNG_OK
) {
1830 channel_created
= 1;
1833 /* Get the newly created kernel channel pointer */
1834 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1835 session
->kernel_session
);
1836 if (kchan
== NULL
) {
1837 /* This sould not happen... */
1838 ret
= LTTNG_ERR_FATAL
;
1842 switch (event
->type
) {
1843 case LTTNG_EVENT_ALL
:
1845 char *filter_expression_a
= NULL
;
1846 struct lttng_filter_bytecode
*filter_a
= NULL
;
1849 * We need to duplicate filter_expression and filter,
1850 * because ownership is passed to first enable
1853 if (filter_expression
) {
1854 filter_expression_a
= strdup(filter_expression
);
1855 if (!filter_expression_a
) {
1856 ret
= LTTNG_ERR_FATAL
;
1861 filter_a
= zmalloc(sizeof(*filter_a
) + filter
->len
);
1863 free(filter_expression_a
);
1864 ret
= LTTNG_ERR_FATAL
;
1867 memcpy(filter_a
, filter
, sizeof(*filter_a
) + filter
->len
);
1869 event
->type
= LTTNG_EVENT_TRACEPOINT
; /* Hack */
1870 ret
= event_kernel_enable_event(kchan
, event
,
1871 filter_expression
, filter
);
1872 /* We have passed ownership */
1873 filter_expression
= NULL
;
1875 if (ret
!= LTTNG_OK
) {
1876 if (channel_created
) {
1877 /* Let's not leak a useless channel. */
1878 kernel_destroy_channel(kchan
);
1880 free(filter_expression_a
);
1884 event
->type
= LTTNG_EVENT_SYSCALL
; /* Hack */
1885 ret
= event_kernel_enable_event(kchan
, event
,
1886 filter_expression_a
, filter_a
);
1887 /* We have passed ownership */
1888 filter_expression_a
= NULL
;
1890 if (ret
!= LTTNG_OK
) {
1895 case LTTNG_EVENT_PROBE
:
1896 case LTTNG_EVENT_FUNCTION
:
1897 case LTTNG_EVENT_FUNCTION_ENTRY
:
1898 case LTTNG_EVENT_TRACEPOINT
:
1899 ret
= event_kernel_enable_event(kchan
, event
,
1900 filter_expression
, filter
);
1901 /* We have passed ownership */
1902 filter_expression
= NULL
;
1904 if (ret
!= LTTNG_OK
) {
1905 if (channel_created
) {
1906 /* Let's not leak a useless channel. */
1907 kernel_destroy_channel(kchan
);
1912 case LTTNG_EVENT_SYSCALL
:
1913 ret
= event_kernel_enable_event(kchan
, event
,
1914 filter_expression
, filter
);
1915 /* We have passed ownership */
1916 filter_expression
= NULL
;
1918 if (ret
!= LTTNG_OK
) {
1923 ret
= LTTNG_ERR_UNK
;
1927 kernel_wait_quiescent(kernel_tracer_fd
);
1930 case LTTNG_DOMAIN_UST
:
1932 struct ltt_ust_channel
*uchan
;
1933 struct ltt_ust_session
*usess
= session
->ust_session
;
1938 * If a non-default channel has been created in the
1939 * session, explicitely require that -c chan_name needs
1942 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1943 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1947 /* Get channel from global UST domain */
1948 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1950 if (uchan
== NULL
) {
1951 /* Create default channel */
1952 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1953 usess
->buffer_type
);
1955 ret
= LTTNG_ERR_FATAL
;
1958 if (lttng_strncpy(attr
->name
, channel_name
,
1959 sizeof(attr
->name
))) {
1960 ret
= LTTNG_ERR_INVALID
;
1964 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1965 if (ret
!= LTTNG_OK
) {
1969 /* Get the newly created channel reference back */
1970 uchan
= trace_ust_find_channel_by_name(
1971 usess
->domain_global
.channels
, channel_name
);
1975 if (uchan
->domain
!= LTTNG_DOMAIN_UST
&& !internal_event
) {
1977 * Don't allow users to add UST events to channels which
1978 * are assigned to a userspace subdomain (JUL, Log4J,
1981 ret
= LTTNG_ERR_INVALID_CHANNEL_DOMAIN
;
1985 if (!internal_event
) {
1987 * Ensure the event name is not reserved for internal
1990 ret
= validate_ust_event_name(event
->name
);
1992 WARN("Userspace event name %s failed validation.",
1994 event
->name
: "NULL");
1995 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
2000 /* At this point, the session and channel exist on the tracer */
2001 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
,
2002 filter_expression
, filter
, exclusion
,
2004 /* We have passed ownership */
2005 filter_expression
= NULL
;
2008 if (ret
== LTTNG_ERR_UST_EVENT_ENABLED
) {
2009 goto already_enabled
;
2010 } else if (ret
!= LTTNG_OK
) {
2015 case LTTNG_DOMAIN_LOG4J
:
2016 case LTTNG_DOMAIN_JUL
:
2017 case LTTNG_DOMAIN_PYTHON
:
2019 const char *default_event_name
, *default_chan_name
;
2021 struct lttng_event uevent
;
2022 struct lttng_domain tmp_dom
;
2023 struct ltt_ust_session
*usess
= session
->ust_session
;
2027 agt
= trace_ust_find_agent(usess
, domain
->type
);
2029 agt
= agent_create(domain
->type
);
2031 ret
= LTTNG_ERR_NOMEM
;
2034 agent_add(agt
, usess
->agents
);
2037 /* Create the default tracepoint. */
2038 memset(&uevent
, 0, sizeof(uevent
));
2039 uevent
.type
= LTTNG_EVENT_TRACEPOINT
;
2040 uevent
.loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
2041 default_event_name
= event_get_default_agent_ust_name(
2043 if (!default_event_name
) {
2044 ret
= LTTNG_ERR_FATAL
;
2047 strncpy(uevent
.name
, default_event_name
, sizeof(uevent
.name
));
2048 uevent
.name
[sizeof(uevent
.name
) - 1] = '\0';
2051 * The domain type is changed because we are about to enable the
2052 * default channel and event for the JUL domain that are hardcoded.
2053 * This happens in the UST domain.
2055 memcpy(&tmp_dom
, domain
, sizeof(tmp_dom
));
2056 tmp_dom
.type
= LTTNG_DOMAIN_UST
;
2058 switch (domain
->type
) {
2059 case LTTNG_DOMAIN_LOG4J
:
2060 default_chan_name
= DEFAULT_LOG4J_CHANNEL_NAME
;
2062 case LTTNG_DOMAIN_JUL
:
2063 default_chan_name
= DEFAULT_JUL_CHANNEL_NAME
;
2065 case LTTNG_DOMAIN_PYTHON
:
2066 default_chan_name
= DEFAULT_PYTHON_CHANNEL_NAME
;
2069 /* The switch/case we are in makes this impossible */
2074 char *filter_expression_copy
= NULL
;
2075 struct lttng_filter_bytecode
*filter_copy
= NULL
;
2078 const size_t filter_size
= sizeof(
2079 struct lttng_filter_bytecode
)
2082 filter_copy
= zmalloc(filter_size
);
2084 ret
= LTTNG_ERR_NOMEM
;
2087 memcpy(filter_copy
, filter
, filter_size
);
2089 filter_expression_copy
=
2090 strdup(filter_expression
);
2091 if (!filter_expression
) {
2092 ret
= LTTNG_ERR_NOMEM
;
2095 if (!filter_expression_copy
|| !filter_copy
) {
2096 free(filter_expression_copy
);
2102 ret
= cmd_enable_event_internal(session
, &tmp_dom
,
2103 (char *) default_chan_name
,
2104 &uevent
, filter_expression_copy
,
2105 filter_copy
, NULL
, wpipe
);
2108 if (ret
== LTTNG_ERR_UST_EVENT_ENABLED
) {
2109 goto already_enabled
;
2110 } else if (ret
!= LTTNG_OK
) {
2114 /* The wild card * means that everything should be enabled. */
2115 if (strncmp(event
->name
, "*", 1) == 0 && strlen(event
->name
) == 1) {
2116 ret
= event_agent_enable_all(usess
, agt
, event
, filter
,
2119 ret
= event_agent_enable(usess
, agt
, event
, filter
,
2123 filter_expression
= NULL
;
2124 if (ret
!= LTTNG_OK
) {
2131 ret
= LTTNG_ERR_UND
;
2139 free(filter_expression
);
2148 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2149 * We own filter, exclusion, and filter_expression.
2151 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
2152 char *channel_name
, struct lttng_event
*event
,
2153 char *filter_expression
,
2154 struct lttng_filter_bytecode
*filter
,
2155 struct lttng_event_exclusion
*exclusion
,
2158 return _cmd_enable_event(session
, domain
, channel_name
, event
,
2159 filter_expression
, filter
, exclusion
, wpipe
, false);
2163 * Enable an event which is internal to LTTng. An internal should
2164 * never be made visible to clients and are immune to checks such as
2167 static int cmd_enable_event_internal(struct ltt_session
*session
,
2168 struct lttng_domain
*domain
,
2169 char *channel_name
, struct lttng_event
*event
,
2170 char *filter_expression
,
2171 struct lttng_filter_bytecode
*filter
,
2172 struct lttng_event_exclusion
*exclusion
,
2175 return _cmd_enable_event(session
, domain
, channel_name
, event
,
2176 filter_expression
, filter
, exclusion
, wpipe
, true);
2180 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2182 ssize_t
cmd_list_tracepoints(enum lttng_domain_type domain
,
2183 struct lttng_event
**events
)
2186 ssize_t nb_events
= 0;
2189 case LTTNG_DOMAIN_KERNEL
:
2190 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2191 if (nb_events
< 0) {
2192 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
2196 case LTTNG_DOMAIN_UST
:
2197 nb_events
= ust_app_list_events(events
);
2198 if (nb_events
< 0) {
2199 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2203 case LTTNG_DOMAIN_LOG4J
:
2204 case LTTNG_DOMAIN_JUL
:
2205 case LTTNG_DOMAIN_PYTHON
:
2206 nb_events
= agent_list_events(events
, domain
);
2207 if (nb_events
< 0) {
2208 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2213 ret
= LTTNG_ERR_UND
;
2220 /* Return negative value to differentiate return code */
2225 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2227 ssize_t
cmd_list_tracepoint_fields(enum lttng_domain_type domain
,
2228 struct lttng_event_field
**fields
)
2231 ssize_t nb_fields
= 0;
2234 case LTTNG_DOMAIN_UST
:
2235 nb_fields
= ust_app_list_event_fields(fields
);
2236 if (nb_fields
< 0) {
2237 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2241 case LTTNG_DOMAIN_KERNEL
:
2242 default: /* fall-through */
2243 ret
= LTTNG_ERR_UND
;
2250 /* Return negative value to differentiate return code */
2254 ssize_t
cmd_list_syscalls(struct lttng_event
**events
)
2256 return syscall_table_list(events
);
2260 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2262 * Called with session lock held.
2264 ssize_t
cmd_list_tracker_pids(struct ltt_session
*session
,
2265 enum lttng_domain_type domain
, int32_t **pids
)
2268 ssize_t nr_pids
= 0;
2271 case LTTNG_DOMAIN_KERNEL
:
2273 struct ltt_kernel_session
*ksess
;
2275 ksess
= session
->kernel_session
;
2276 nr_pids
= kernel_list_tracker_pids(ksess
, pids
);
2278 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
2283 case LTTNG_DOMAIN_UST
:
2285 struct ltt_ust_session
*usess
;
2287 usess
= session
->ust_session
;
2288 nr_pids
= trace_ust_list_tracker_pids(usess
, pids
);
2290 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2295 case LTTNG_DOMAIN_LOG4J
:
2296 case LTTNG_DOMAIN_JUL
:
2297 case LTTNG_DOMAIN_PYTHON
:
2299 ret
= LTTNG_ERR_UND
;
2306 /* Return negative value to differentiate return code */
2311 * Command LTTNG_START_TRACE processed by the client thread.
2313 * Called with session mutex held.
2315 int cmd_start_trace(struct ltt_session
*session
)
2318 unsigned long nb_chan
= 0;
2319 struct ltt_kernel_session
*ksession
;
2320 struct ltt_ust_session
*usess
;
2324 /* Ease our life a bit ;) */
2325 ksession
= session
->kernel_session
;
2326 usess
= session
->ust_session
;
2328 /* Is the session already started? */
2329 if (session
->active
) {
2330 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2335 * Starting a session without channel is useless since after that it's not
2336 * possible to enable channel thus inform the client.
2338 if (usess
&& usess
->domain_global
.channels
) {
2339 nb_chan
+= lttng_ht_get_count(usess
->domain_global
.channels
);
2342 nb_chan
+= ksession
->channel_count
;
2345 ret
= LTTNG_ERR_NO_CHANNEL
;
2349 /* Kernel tracing */
2350 if (ksession
!= NULL
) {
2351 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
2352 if (ret
!= LTTNG_OK
) {
2357 /* Flag session that trace should start automatically */
2360 * Even though the start trace might fail, flag this session active so
2361 * other application coming in are started by default.
2365 ret
= ust_app_start_trace_all(usess
);
2367 ret
= LTTNG_ERR_UST_START_FAIL
;
2372 /* Flag this after a successful start. */
2373 session
->has_been_started
= 1;
2374 session
->active
= 1;
2383 * Command LTTNG_STOP_TRACE processed by the client thread.
2385 int cmd_stop_trace(struct ltt_session
*session
)
2388 struct ltt_kernel_channel
*kchan
;
2389 struct ltt_kernel_session
*ksession
;
2390 struct ltt_ust_session
*usess
;
2395 ksession
= session
->kernel_session
;
2396 usess
= session
->ust_session
;
2398 /* Session is not active. Skip everythong and inform the client. */
2399 if (!session
->active
) {
2400 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
2405 if (ksession
&& ksession
->active
) {
2406 DBG("Stop kernel tracing");
2408 ret
= kernel_stop_session(ksession
);
2410 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
2414 kernel_wait_quiescent(kernel_tracer_fd
);
2416 /* Flush metadata after stopping (if exists) */
2417 if (ksession
->metadata_stream_fd
>= 0) {
2418 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2420 ERR("Kernel metadata flush failed");
2424 /* Flush all buffers after stopping */
2425 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2426 ret
= kernel_flush_buffer(kchan
);
2428 ERR("Kernel flush buffer error");
2432 ksession
->active
= 0;
2435 if (usess
&& usess
->active
) {
2437 * Even though the stop trace might fail, flag this session inactive so
2438 * other application coming in are not started by default.
2442 ret
= ust_app_stop_trace_all(usess
);
2444 ret
= LTTNG_ERR_UST_STOP_FAIL
;
2449 /* Flag inactive after a successful stop. */
2450 session
->active
= 0;
2458 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2460 int cmd_set_consumer_uri(struct ltt_session
*session
, size_t nb_uri
,
2461 struct lttng_uri
*uris
)
2464 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2465 struct ltt_ust_session
*usess
= session
->ust_session
;
2471 /* Can't set consumer URI if the session is active. */
2472 if (session
->active
) {
2473 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2477 /* Set the "global" consumer URIs */
2478 for (i
= 0; i
< nb_uri
; i
++) {
2479 ret
= add_uri_to_consumer(session
->consumer
,
2480 &uris
[i
], 0, session
->name
);
2481 if (ret
!= LTTNG_OK
) {
2486 /* Set UST session URIs */
2487 if (session
->ust_session
) {
2488 for (i
= 0; i
< nb_uri
; i
++) {
2489 ret
= add_uri_to_consumer(
2490 session
->ust_session
->consumer
,
2491 &uris
[i
], LTTNG_DOMAIN_UST
,
2493 if (ret
!= LTTNG_OK
) {
2499 /* Set kernel session URIs */
2500 if (session
->kernel_session
) {
2501 for (i
= 0; i
< nb_uri
; i
++) {
2502 ret
= add_uri_to_consumer(
2503 session
->kernel_session
->consumer
,
2504 &uris
[i
], LTTNG_DOMAIN_KERNEL
,
2506 if (ret
!= LTTNG_OK
) {
2513 * Make sure to set the session in output mode after we set URI since a
2514 * session can be created without URL (thus flagged in no output mode).
2516 session
->output_traces
= 1;
2518 ksess
->output_traces
= 1;
2522 usess
->output_traces
= 1;
2533 * Command LTTNG_CREATE_SESSION processed by the client thread.
2535 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
2536 size_t nb_uri
, lttng_sock_cred
*creds
, unsigned int live_timer
)
2539 struct ltt_session
*session
;
2545 * Verify if the session already exist
2547 * XXX: There is no need for the session lock list here since the caller
2548 * (process_client_msg) is holding it. We might want to change that so a
2549 * single command does not lock the entire session list.
2551 session
= session_find_by_name(name
);
2552 if (session
!= NULL
) {
2553 ret
= LTTNG_ERR_EXIST_SESS
;
2557 /* Create tracing session in the registry */
2558 ret
= session_create(name
, LTTNG_SOCK_GET_UID_CRED(creds
),
2559 LTTNG_SOCK_GET_GID_CRED(creds
));
2560 if (ret
!= LTTNG_OK
) {
2565 * Get the newly created session pointer back
2567 * XXX: There is no need for the session lock list here since the caller
2568 * (process_client_msg) is holding it. We might want to change that so a
2569 * single command does not lock the entire session list.
2571 session
= session_find_by_name(name
);
2574 session
->live_timer
= live_timer
;
2575 /* Create default consumer output for the session not yet created. */
2576 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
2577 if (session
->consumer
== NULL
) {
2578 ret
= LTTNG_ERR_FATAL
;
2579 goto consumer_error
;
2583 ret
= cmd_set_consumer_uri(session
, nb_uri
, uris
);
2584 if (ret
!= LTTNG_OK
) {
2585 goto consumer_error
;
2587 session
->output_traces
= 1;
2589 session
->output_traces
= 0;
2590 DBG2("Session %s created with no output", session
->name
);
2593 session
->consumer
->enabled
= 1;
2598 session_destroy(session
);
2605 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2607 int cmd_create_session_snapshot(char *name
, struct lttng_uri
*uris
,
2608 size_t nb_uri
, lttng_sock_cred
*creds
)
2611 struct ltt_session
*session
;
2612 struct snapshot_output
*new_output
= NULL
;
2618 * Create session in no output mode with URIs set to NULL. The uris we've
2619 * received are for a default snapshot output if one.
2621 ret
= cmd_create_session_uri(name
, NULL
, 0, creds
, 0);
2622 if (ret
!= LTTNG_OK
) {
2626 /* Get the newly created session pointer back. This should NEVER fail. */
2627 session
= session_find_by_name(name
);
2630 /* Flag session for snapshot mode. */
2631 session
->snapshot_mode
= 1;
2633 /* Skip snapshot output creation if no URI is given. */
2638 new_output
= snapshot_output_alloc();
2640 ret
= LTTNG_ERR_NOMEM
;
2641 goto error_snapshot_alloc
;
2644 ret
= snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE
, NULL
,
2645 uris
, nb_uri
, session
->consumer
, new_output
, &session
->snapshot
);
2647 if (ret
== -ENOMEM
) {
2648 ret
= LTTNG_ERR_NOMEM
;
2650 ret
= LTTNG_ERR_INVALID
;
2652 goto error_snapshot
;
2656 snapshot_add_output(&session
->snapshot
, new_output
);
2663 snapshot_output_destroy(new_output
);
2664 error_snapshot_alloc
:
2665 session_destroy(session
);
2671 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2673 * Called with session lock held.
2675 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
2678 struct ltt_ust_session
*usess
;
2679 struct ltt_kernel_session
*ksess
;
2684 usess
= session
->ust_session
;
2685 ksess
= session
->kernel_session
;
2687 /* Clean kernel session teardown */
2688 kernel_destroy_session(ksess
);
2690 /* UST session teardown */
2692 /* Close any relayd session */
2693 consumer_output_send_destroy_relayd(usess
->consumer
);
2695 /* Destroy every UST application related to this session. */
2696 ret
= ust_app_destroy_trace_all(usess
);
2698 ERR("Error in ust_app_destroy_trace_all");
2701 /* Clean up the rest. */
2702 trace_ust_destroy_session(usess
);
2706 * Must notify the kernel thread here to update it's poll set in order to
2707 * remove the channel(s)' fd just destroyed.
2709 ret
= notify_thread_pipe(wpipe
);
2711 PERROR("write kernel poll pipe");
2714 ret
= session_destroy(session
);
2720 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2722 int cmd_register_consumer(struct ltt_session
*session
,
2723 enum lttng_domain_type domain
, const char *sock_path
,
2724 struct consumer_data
*cdata
)
2727 struct consumer_socket
*socket
= NULL
;
2734 case LTTNG_DOMAIN_KERNEL
:
2736 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2740 /* Can't register a consumer if there is already one */
2741 if (ksess
->consumer_fds_sent
!= 0) {
2742 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2746 sock
= lttcomm_connect_unix_sock(sock_path
);
2748 ret
= LTTNG_ERR_CONNECT_FAIL
;
2751 cdata
->cmd_sock
= sock
;
2753 socket
= consumer_allocate_socket(&cdata
->cmd_sock
);
2754 if (socket
== NULL
) {
2757 PERROR("close register consumer");
2759 cdata
->cmd_sock
= -1;
2760 ret
= LTTNG_ERR_FATAL
;
2764 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
2765 if (socket
->lock
== NULL
) {
2766 PERROR("zmalloc pthread mutex");
2767 ret
= LTTNG_ERR_FATAL
;
2770 pthread_mutex_init(socket
->lock
, NULL
);
2771 socket
->registered
= 1;
2774 consumer_add_socket(socket
, ksess
->consumer
);
2777 pthread_mutex_lock(&cdata
->pid_mutex
);
2779 pthread_mutex_unlock(&cdata
->pid_mutex
);
2784 /* TODO: Userspace tracing */
2785 ret
= LTTNG_ERR_UND
;
2793 consumer_destroy_socket(socket
);
2799 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2801 ssize_t
cmd_list_domains(struct ltt_session
*session
,
2802 struct lttng_domain
**domains
)
2807 struct lttng_ht_iter iter
;
2809 if (session
->kernel_session
!= NULL
) {
2810 DBG3("Listing domains found kernel domain");
2814 if (session
->ust_session
!= NULL
) {
2815 DBG3("Listing domains found UST global domain");
2819 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
2821 if (agt
->being_used
) {
2832 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2833 if (*domains
== NULL
) {
2834 ret
= LTTNG_ERR_FATAL
;
2838 if (session
->kernel_session
!= NULL
) {
2839 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2841 /* Kernel session buffer type is always GLOBAL */
2842 (*domains
)[index
].buf_type
= LTTNG_BUFFER_GLOBAL
;
2847 if (session
->ust_session
!= NULL
) {
2848 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2849 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2853 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
2855 if (agt
->being_used
) {
2856 (*domains
)[index
].type
= agt
->domain
;
2857 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
2867 /* Return negative value to differentiate return code */
2873 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2875 ssize_t
cmd_list_channels(enum lttng_domain_type domain
,
2876 struct ltt_session
*session
, struct lttng_channel
**channels
)
2878 ssize_t nb_chan
= 0, payload_size
= 0, ret
;
2881 case LTTNG_DOMAIN_KERNEL
:
2882 if (session
->kernel_session
!= NULL
) {
2883 nb_chan
= session
->kernel_session
->channel_count
;
2885 DBG3("Number of kernel channels %zd", nb_chan
);
2887 ret
= -LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2891 case LTTNG_DOMAIN_UST
:
2892 if (session
->ust_session
!= NULL
) {
2894 nb_chan
= lttng_ht_get_count(
2895 session
->ust_session
->domain_global
.channels
);
2898 DBG3("Number of UST global channels %zd", nb_chan
);
2900 ret
= -LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2905 ret
= -LTTNG_ERR_UND
;
2910 const size_t channel_size
= sizeof(struct lttng_channel
) +
2911 sizeof(struct lttcomm_channel_extended
);
2912 struct lttcomm_channel_extended
*channel_exts
;
2914 payload_size
= nb_chan
* channel_size
;
2915 *channels
= zmalloc(payload_size
);
2916 if (*channels
== NULL
) {
2917 ret
= -LTTNG_ERR_FATAL
;
2921 channel_exts
= ((void *) *channels
) +
2922 (nb_chan
* sizeof(struct lttng_channel
));
2923 list_lttng_channels(domain
, session
, *channels
, channel_exts
);
2934 * Command LTTNG_LIST_EVENTS processed by the client thread.
2936 ssize_t
cmd_list_events(enum lttng_domain_type domain
,
2937 struct ltt_session
*session
, char *channel_name
,
2938 struct lttng_event
**events
, size_t *total_size
)
2941 ssize_t nb_event
= 0;
2944 case LTTNG_DOMAIN_KERNEL
:
2945 if (session
->kernel_session
!= NULL
) {
2946 nb_event
= list_lttng_kernel_events(channel_name
,
2947 session
->kernel_session
, events
,
2951 case LTTNG_DOMAIN_UST
:
2953 if (session
->ust_session
!= NULL
) {
2954 nb_event
= list_lttng_ust_global_events(channel_name
,
2955 &session
->ust_session
->domain_global
, events
,
2960 case LTTNG_DOMAIN_LOG4J
:
2961 case LTTNG_DOMAIN_JUL
:
2962 case LTTNG_DOMAIN_PYTHON
:
2963 if (session
->ust_session
) {
2964 struct lttng_ht_iter iter
;
2968 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
,
2969 &iter
.iter
, agt
, node
.node
) {
2970 if (agt
->domain
== domain
) {
2971 nb_event
= list_lttng_agent_events(
2981 ret
= LTTNG_ERR_UND
;
2988 /* Return negative value to differentiate return code */
2993 * Using the session list, filled a lttng_session array to send back to the
2994 * client for session listing.
2996 * The session list lock MUST be acquired before calling this function. Use
2997 * session_lock_list() and session_unlock_list().
2999 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
3004 struct ltt_session
*session
;
3005 struct ltt_session_list
*list
= session_get_list();
3007 DBG("Getting all available session for UID %d GID %d",
3010 * Iterate over session list and append data after the control struct in
3013 cds_list_for_each_entry(session
, &list
->head
, list
) {
3015 * Only list the sessions the user can control.
3017 if (!session_access_ok(session
, uid
, gid
)) {
3021 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3022 struct ltt_ust_session
*usess
= session
->ust_session
;
3024 if (session
->consumer
->type
== CONSUMER_DST_NET
||
3025 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
3026 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
3027 ret
= build_network_session_path(sessions
[i
].path
,
3028 sizeof(sessions
[i
].path
), session
);
3030 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
3031 session
->consumer
->dst
.trace_path
);
3034 PERROR("snprintf session path");
3038 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
3039 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
3040 sessions
[i
].enabled
= session
->active
;
3041 sessions
[i
].snapshot_mode
= session
->snapshot_mode
;
3042 sessions
[i
].live_timer_interval
= session
->live_timer
;
3048 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
3049 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
3051 int cmd_data_pending(struct ltt_session
*session
)
3054 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3055 struct ltt_ust_session
*usess
= session
->ust_session
;
3059 /* Session MUST be stopped to ask for data availability. */
3060 if (session
->active
) {
3061 ret
= LTTNG_ERR_SESSION_STARTED
;
3065 * If stopped, just make sure we've started before else the above call
3066 * will always send that there is data pending.
3068 * The consumer assumes that when the data pending command is received,
3069 * the trace has been started before or else no output data is written
3070 * by the streams which is a condition for data pending. So, this is
3071 * *VERY* important that we don't ask the consumer before a start
3074 if (!session
->has_been_started
) {
3080 if (ksess
&& ksess
->consumer
) {
3081 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
3083 /* Data is still being extracted for the kernel. */
3088 if (usess
&& usess
->consumer
) {
3089 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
3091 /* Data is still being extracted for the kernel. */
3096 /* Data is ready to be read by a viewer */
3104 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
3106 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3108 int cmd_snapshot_add_output(struct ltt_session
*session
,
3109 struct lttng_snapshot_output
*output
, uint32_t *id
)
3112 struct snapshot_output
*new_output
;
3117 DBG("Cmd snapshot add output for session %s", session
->name
);
3120 * Can't create an output if the session is not set in no-output mode.
3122 if (session
->output_traces
) {
3123 ret
= LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
3127 /* Only one output is allowed until we have the "tee" feature. */
3128 if (session
->snapshot
.nb_output
== 1) {
3129 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
3133 new_output
= snapshot_output_alloc();
3135 ret
= LTTNG_ERR_NOMEM
;
3139 ret
= snapshot_output_init(output
->max_size
, output
->name
,
3140 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
3141 &session
->snapshot
);
3143 if (ret
== -ENOMEM
) {
3144 ret
= LTTNG_ERR_NOMEM
;
3146 ret
= LTTNG_ERR_INVALID
;
3152 snapshot_add_output(&session
->snapshot
, new_output
);
3154 *id
= new_output
->id
;
3161 snapshot_output_destroy(new_output
);
3167 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
3169 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3171 int cmd_snapshot_del_output(struct ltt_session
*session
,
3172 struct lttng_snapshot_output
*output
)
3175 struct snapshot_output
*sout
= NULL
;
3183 * Permission denied to create an output if the session is not
3184 * set in no output mode.
3186 if (session
->output_traces
) {
3187 ret
= LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
3192 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
3194 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
3195 } else if (*output
->name
!= '\0') {
3196 DBG("Cmd snapshot del output name %s for session %s", output
->name
,
3198 sout
= snapshot_find_output_by_name(output
->name
, &session
->snapshot
);
3201 ret
= LTTNG_ERR_INVALID
;
3205 snapshot_delete_output(&session
->snapshot
, sout
);
3206 snapshot_output_destroy(sout
);
3215 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
3217 * If no output is available, outputs is untouched and 0 is returned.
3219 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
3221 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
3222 struct lttng_snapshot_output
**outputs
)
3225 struct lttng_snapshot_output
*list
= NULL
;
3226 struct lttng_ht_iter iter
;
3227 struct snapshot_output
*output
;
3232 DBG("Cmd snapshot list outputs for session %s", session
->name
);
3235 * Permission denied to create an output if the session is not
3236 * set in no output mode.
3238 if (session
->output_traces
) {
3239 ret
= -LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
3243 if (session
->snapshot
.nb_output
== 0) {
3248 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
3250 ret
= -LTTNG_ERR_NOMEM
;
3254 /* Copy list from session to the new list object. */
3256 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
3257 output
, node
.node
) {
3258 assert(output
->consumer
);
3259 list
[idx
].id
= output
->id
;
3260 list
[idx
].max_size
= output
->max_size
;
3261 if (lttng_strncpy(list
[idx
].name
, output
->name
,
3262 sizeof(list
[idx
].name
))) {
3263 ret
= -LTTNG_ERR_INVALID
;
3266 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
3267 if (lttng_strncpy(list
[idx
].ctrl_url
,
3268 output
->consumer
->dst
.trace_path
,
3269 sizeof(list
[idx
].ctrl_url
))) {
3270 ret
= -LTTNG_ERR_INVALID
;
3275 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
3276 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
3278 ret
= -LTTNG_ERR_NOMEM
;
3283 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
3284 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
3286 ret
= -LTTNG_ERR_NOMEM
;
3295 ret
= session
->snapshot
.nb_output
;
3304 * Check if we can regenerate the metadata for this session.
3305 * Only kernel, UST per-uid and non-live sessions are supported.
3307 * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise.
3310 int check_regenerate_metadata_support(struct ltt_session
*session
)
3316 if (session
->live_timer
!= 0) {
3317 ret
= LTTNG_ERR_LIVE_SESSION
;
3320 if (!session
->active
) {
3321 ret
= LTTNG_ERR_SESSION_NOT_STARTED
;
3324 if (session
->ust_session
) {
3325 switch (session
->ust_session
->buffer_type
) {
3326 case LTTNG_BUFFER_PER_UID
:
3328 case LTTNG_BUFFER_PER_PID
:
3329 ret
= LTTNG_ERR_PER_PID_SESSION
;
3333 ret
= LTTNG_ERR_UNK
;
3337 if (session
->consumer
->type
== CONSUMER_DST_NET
&&
3338 session
->consumer
->relay_minor_version
< 8) {
3339 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
3349 int clear_metadata_file(int fd
)
3353 ret
= lseek(fd
, 0, SEEK_SET
);
3359 ret
= ftruncate(fd
, 0);
3361 PERROR("ftruncate");
3370 int ust_regenerate_metadata(struct ltt_ust_session
*usess
)
3373 struct buffer_reg_uid
*uid_reg
= NULL
;
3374 struct buffer_reg_session
*session_reg
= NULL
;
3377 cds_list_for_each_entry(uid_reg
, &usess
->buffer_reg_uid_list
, lnode
) {
3378 struct ust_registry_session
*registry
;
3379 struct ust_registry_channel
*chan
;
3380 struct lttng_ht_iter iter_chan
;
3382 session_reg
= uid_reg
->registry
;
3383 registry
= session_reg
->reg
.ust
;
3385 pthread_mutex_lock(®istry
->lock
);
3386 registry
->metadata_len_sent
= 0;
3387 memset(registry
->metadata
, 0, registry
->metadata_alloc_len
);
3388 registry
->metadata_len
= 0;
3389 registry
->metadata_version
++;
3390 if (registry
->metadata_fd
> 0) {
3391 /* Clear the metadata file's content. */
3392 ret
= clear_metadata_file(registry
->metadata_fd
);
3394 pthread_mutex_unlock(®istry
->lock
);
3399 ret
= ust_metadata_session_statedump(registry
, NULL
,
3400 registry
->major
, registry
->minor
);
3402 pthread_mutex_unlock(®istry
->lock
);
3403 ERR("Failed to generate session metadata (err = %d)",
3407 cds_lfht_for_each_entry(registry
->channels
->ht
, &iter_chan
.iter
,
3409 struct ust_registry_event
*event
;
3410 struct lttng_ht_iter iter_event
;
3412 ret
= ust_metadata_channel_statedump(registry
, chan
);
3414 pthread_mutex_unlock(®istry
->lock
);
3415 ERR("Failed to generate channel metadata "
3419 cds_lfht_for_each_entry(chan
->ht
->ht
, &iter_event
.iter
,
3421 ret
= ust_metadata_event_statedump(registry
,
3424 pthread_mutex_unlock(®istry
->lock
);
3425 ERR("Failed to generate event metadata "
3431 pthread_mutex_unlock(®istry
->lock
);
3440 * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library.
3442 * Ask the consumer to truncate the existing metadata file(s) and
3443 * then regenerate the metadata. Live and per-pid sessions are not
3444 * supported and return an error.
3446 * Return 0 on success or else a LTTNG_ERR code.
3448 int cmd_regenerate_metadata(struct ltt_session
*session
)
3454 ret
= check_regenerate_metadata_support(session
);
3459 if (session
->kernel_session
) {
3460 ret
= kernctl_session_regenerate_metadata(
3461 session
->kernel_session
->fd
);
3463 ERR("Failed to regenerate the kernel metadata");
3468 if (session
->ust_session
) {
3469 ret
= ust_regenerate_metadata(session
->ust_session
);
3471 ERR("Failed to regenerate the UST metadata");
3475 DBG("Cmd metadata regenerate for session %s", session
->name
);
3483 * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library.
3485 * Ask the tracer to regenerate a new statedump.
3487 * Return 0 on success or else a LTTNG_ERR code.
3489 int cmd_regenerate_statedump(struct ltt_session
*session
)
3495 if (!session
->active
) {
3496 ret
= LTTNG_ERR_SESSION_NOT_STARTED
;
3501 if (session
->kernel_session
) {
3502 ret
= kernctl_session_regenerate_statedump(
3503 session
->kernel_session
->fd
);
3505 * Currently, the statedump in kernel can only fail if out
3509 if (ret
== -ENOMEM
) {
3510 ret
= LTTNG_ERR_REGEN_STATEDUMP_NOMEM
;
3512 ret
= LTTNG_ERR_REGEN_STATEDUMP_FAIL
;
3514 ERR("Failed to regenerate the kernel statedump");
3519 if (session
->ust_session
) {
3520 ret
= ust_app_regenerate_statedump_all(session
->ust_session
);
3522 * Currently, the statedump in UST always returns 0.
3525 ret
= LTTNG_ERR_REGEN_STATEDUMP_FAIL
;
3526 ERR("Failed to regenerate the UST statedump");
3530 DBG("Cmd regenerate statedump for session %s", session
->name
);
3538 * Send relayd sockets from snapshot output to consumer. Ignore request if the
3539 * snapshot output is *not* set with a remote destination.
3541 * Return 0 on success or a LTTNG_ERR code.
3543 static int set_relayd_for_snapshot(struct consumer_output
*consumer
,
3544 struct snapshot_output
*snap_output
, struct ltt_session
*session
)
3547 struct lttng_ht_iter iter
;
3548 struct consumer_socket
*socket
;
3551 assert(snap_output
);
3554 DBG2("Set relayd object from snapshot output");
3556 /* Ignore if snapshot consumer output is not network. */
3557 if (snap_output
->consumer
->type
!= CONSUMER_DST_NET
) {
3562 * For each consumer socket, create and send the relayd object of the
3566 cds_lfht_for_each_entry(snap_output
->consumer
->socks
->ht
, &iter
.iter
,
3567 socket
, node
.node
) {
3568 ret
= send_consumer_relayd_sockets(0, session
->id
,
3569 snap_output
->consumer
, socket
,
3570 session
->name
, session
->hostname
,
3571 session
->live_timer
);
3572 if (ret
!= LTTNG_OK
) {
3584 * Record a kernel snapshot.
3586 * Return LTTNG_OK on success or a LTTNG_ERR code.
3588 static int record_kernel_snapshot(struct ltt_kernel_session
*ksess
,
3589 struct snapshot_output
*output
, struct ltt_session
*session
,
3590 int wait
, uint64_t nb_packets_per_stream
)
3600 * Copy kernel session sockets so we can communicate with the right
3601 * consumer for the snapshot record command.
3603 ret
= consumer_copy_sockets(output
->consumer
, ksess
->consumer
);
3605 ret
= LTTNG_ERR_NOMEM
;
3609 ret
= set_relayd_for_snapshot(ksess
->consumer
, output
, session
);
3610 if (ret
!= LTTNG_OK
) {
3611 goto error_snapshot
;
3614 ret
= kernel_snapshot_record(ksess
, output
, wait
, nb_packets_per_stream
);
3615 if (ret
!= LTTNG_OK
) {
3616 goto error_snapshot
;
3623 /* Clean up copied sockets so this output can use some other later on. */
3624 consumer_destroy_output_sockets(output
->consumer
);
3631 * Record a UST snapshot.
3633 * Return 0 on success or a LTTNG_ERR error code.
3635 static int record_ust_snapshot(struct ltt_ust_session
*usess
,
3636 struct snapshot_output
*output
, struct ltt_session
*session
,
3637 int wait
, uint64_t nb_packets_per_stream
)
3646 * Copy UST session sockets so we can communicate with the right
3647 * consumer for the snapshot record command.
3649 ret
= consumer_copy_sockets(output
->consumer
, usess
->consumer
);
3651 ret
= LTTNG_ERR_NOMEM
;
3655 ret
= set_relayd_for_snapshot(usess
->consumer
, output
, session
);
3656 if (ret
!= LTTNG_OK
) {
3657 goto error_snapshot
;
3660 ret
= ust_app_snapshot_record(usess
, output
, wait
, nb_packets_per_stream
);
3664 ret
= LTTNG_ERR_INVALID
;
3667 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
3670 goto error_snapshot
;
3676 /* Clean up copied sockets so this output can use some other later on. */
3677 consumer_destroy_output_sockets(output
->consumer
);
3683 uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session
*session
,
3684 uint64_t cur_nr_packets
)
3686 uint64_t tot_size
= 0;
3688 if (session
->kernel_session
) {
3689 struct ltt_kernel_channel
*chan
;
3690 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3692 cds_list_for_each_entry(chan
, &ksess
->channel_list
.head
, list
) {
3693 if (cur_nr_packets
>= chan
->channel
->attr
.num_subbuf
) {
3695 * Don't take channel into account if we
3696 * already grab all its packets.
3700 tot_size
+= chan
->channel
->attr
.subbuf_size
3701 * chan
->stream_count
;
3705 if (session
->ust_session
) {
3706 struct ltt_ust_session
*usess
= session
->ust_session
;
3708 tot_size
+= ust_app_get_size_one_more_packet_per_stream(usess
,
3716 * Calculate the number of packets we can grab from each stream that
3717 * fits within the overall snapshot max size.
3719 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
3720 * the number of packets per stream.
3722 * TODO: this approach is not perfect: we consider the worse case
3723 * (packet filling the sub-buffers) as an upper bound, but we could do
3724 * better if we do this calculation while we actually grab the packet
3725 * content: we would know how much padding we don't actually store into
3728 * This algorithm is currently bounded by the number of packets per
3731 * Since we call this algorithm before actually grabbing the data, it's
3732 * an approximation: for instance, applications could appear/disappear
3733 * in between this call and actually grabbing data.
3736 int64_t get_session_nb_packets_per_stream(struct ltt_session
*session
, uint64_t max_size
)
3739 uint64_t cur_nb_packets
= 0;
3742 return 0; /* Infinite */
3745 size_left
= max_size
;
3747 uint64_t one_more_packet_tot_size
;
3749 one_more_packet_tot_size
= get_session_size_one_more_packet_per_stream(session
,
3751 if (!one_more_packet_tot_size
) {
3752 /* We are already grabbing all packets. */
3755 size_left
-= one_more_packet_tot_size
;
3756 if (size_left
< 0) {
3761 if (!cur_nb_packets
) {
3762 /* Not enough room to grab one packet of each stream, error. */
3765 return cur_nb_packets
;
3769 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3771 * The wait parameter is ignored so this call always wait for the snapshot to
3772 * complete before returning.
3774 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3776 int cmd_snapshot_record(struct ltt_session
*session
,
3777 struct lttng_snapshot_output
*output
, int wait
)
3780 unsigned int use_tmp_output
= 0;
3781 struct snapshot_output tmp_output
;
3782 unsigned int snapshot_success
= 0;
3788 DBG("Cmd snapshot record for session %s", session
->name
);
3790 /* Get the datetime for the snapshot output directory. */
3791 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", datetime
,
3794 ret
= LTTNG_ERR_INVALID
;
3799 * Permission denied to create an output if the session is not
3800 * set in no output mode.
3802 if (session
->output_traces
) {
3803 ret
= LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
3807 /* The session needs to be started at least once. */
3808 if (!session
->has_been_started
) {
3809 ret
= LTTNG_ERR_START_SESSION_ONCE
;
3813 /* Use temporary output for the session. */
3814 if (*output
->ctrl_url
!= '\0') {
3815 ret
= snapshot_output_init(output
->max_size
, output
->name
,
3816 output
->ctrl_url
, output
->data_url
, session
->consumer
,
3819 if (ret
== -ENOMEM
) {
3820 ret
= LTTNG_ERR_NOMEM
;
3822 ret
= LTTNG_ERR_INVALID
;
3826 /* Use the global session count for the temporary snapshot. */
3827 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3829 /* Use the global datetime */
3830 memcpy(tmp_output
.datetime
, datetime
, sizeof(datetime
));
3834 if (use_tmp_output
) {
3835 int64_t nb_packets_per_stream
;
3837 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
3838 tmp_output
.max_size
);
3839 if (nb_packets_per_stream
< 0) {
3840 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3844 if (session
->kernel_session
) {
3845 ret
= record_kernel_snapshot(session
->kernel_session
,
3846 &tmp_output
, session
,
3847 wait
, nb_packets_per_stream
);
3848 if (ret
!= LTTNG_OK
) {
3853 if (session
->ust_session
) {
3854 ret
= record_ust_snapshot(session
->ust_session
,
3855 &tmp_output
, session
,
3856 wait
, nb_packets_per_stream
);
3857 if (ret
!= LTTNG_OK
) {
3862 snapshot_success
= 1;
3864 struct snapshot_output
*sout
;
3865 struct lttng_ht_iter iter
;
3868 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
3869 &iter
.iter
, sout
, node
.node
) {
3870 int64_t nb_packets_per_stream
;
3873 * Make a local copy of the output and assign the possible
3874 * temporary value given by the caller.
3876 memset(&tmp_output
, 0, sizeof(tmp_output
));
3877 memcpy(&tmp_output
, sout
, sizeof(tmp_output
));
3879 if (output
->max_size
!= (uint64_t) -1ULL) {
3880 tmp_output
.max_size
= output
->max_size
;
3883 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
3884 tmp_output
.max_size
);
3885 if (nb_packets_per_stream
< 0) {
3886 ret
= LTTNG_ERR_MAX_SIZE_INVALID
;
3891 /* Use temporary name. */
3892 if (*output
->name
!= '\0') {
3893 if (lttng_strncpy(tmp_output
.name
, output
->name
,
3894 sizeof(tmp_output
.name
))) {
3895 ret
= LTTNG_ERR_INVALID
;
3901 tmp_output
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
3902 memcpy(tmp_output
.datetime
, datetime
, sizeof(datetime
));
3904 if (session
->kernel_session
) {
3905 ret
= record_kernel_snapshot(session
->kernel_session
,
3906 &tmp_output
, session
,
3907 wait
, nb_packets_per_stream
);
3908 if (ret
!= LTTNG_OK
) {
3914 if (session
->ust_session
) {
3915 ret
= record_ust_snapshot(session
->ust_session
,
3916 &tmp_output
, session
,
3917 wait
, nb_packets_per_stream
);
3918 if (ret
!= LTTNG_OK
) {
3923 snapshot_success
= 1;
3928 if (snapshot_success
) {
3929 session
->snapshot
.nb_snapshot
++;
3931 ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
3939 * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
3941 int cmd_set_session_shm_path(struct ltt_session
*session
,
3942 const char *shm_path
)
3948 * Can only set shm path before session is started.
3950 if (session
->has_been_started
) {
3951 return LTTNG_ERR_SESSION_STARTED
;
3954 strncpy(session
->shm_path
, shm_path
,
3955 sizeof(session
->shm_path
));
3956 session
->shm_path
[sizeof(session
->shm_path
) - 1] = '\0';
3962 * Init command subsystem.
3967 * Set network sequence index to 1 for streams to match a relayd
3968 * socket on the consumer side.
3970 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
3971 relayd_net_seq_idx
= 1;
3972 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
3974 DBG("Command subsystem initialized");