2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #include <urcu/list.h>
21 #include <urcu/uatomic.h>
23 #include <common/defaults.h>
24 #include <common/common.h>
25 #include <common/sessiond-comm/sessiond-comm.h>
26 #include <common/relayd/relayd.h>
33 #include "kernel-consumer.h"
34 #include "lttng-sessiond.h"
40 * Used to keep a unique index for each relayd socket created where this value
41 * is associated with streams on the consumer so it can match the right relayd
42 * to send to. It must be accessed with the relayd_net_seq_idx_lock
45 static pthread_mutex_t relayd_net_seq_idx_lock
= PTHREAD_MUTEX_INITIALIZER
;
46 static uint64_t relayd_net_seq_idx
;
49 * Create a session path used by list_lttng_sessions for the case that the
50 * session consumer is on the network.
52 static int build_network_session_path(char *dst
, size_t size
,
53 struct ltt_session
*session
)
55 int ret
, kdata_port
, udata_port
;
56 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
57 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
62 memset(tmp_urls
, 0, sizeof(tmp_urls
));
63 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
65 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
67 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
68 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
69 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
72 if (session
->ust_session
&& session
->ust_session
->consumer
) {
73 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
74 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
77 if (uuri
== NULL
&& kuri
== NULL
) {
78 uri
= &session
->consumer
->dst
.net
.control
;
79 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
80 } else if (kuri
&& uuri
) {
81 ret
= uri_compare(kuri
, uuri
);
85 /* Build uuri URL string */
86 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
93 } else if (kuri
&& uuri
== NULL
) {
95 } else if (uuri
&& kuri
== NULL
) {
99 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
105 * Do we have a UST url set. If yes, this means we have both kernel and UST
108 if (*tmp_uurl
!= '\0') {
109 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
110 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
113 if (kuri
|| (!kuri
&& !uuri
)) {
116 /* No kernel URI, use the UST port. */
119 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, dport
);
127 * Fill lttng_channel array of all channels.
129 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
130 struct lttng_channel
*channels
)
133 struct ltt_kernel_channel
*kchan
;
135 DBG("Listing channels for session %s", session
->name
);
138 case LTTNG_DOMAIN_KERNEL
:
139 /* Kernel channels */
140 if (session
->kernel_session
!= NULL
) {
141 cds_list_for_each_entry(kchan
,
142 &session
->kernel_session
->channel_list
.head
, list
) {
143 /* Copy lttng_channel struct to array */
144 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
145 channels
[i
].enabled
= kchan
->enabled
;
150 case LTTNG_DOMAIN_UST
:
152 struct lttng_ht_iter iter
;
153 struct ltt_ust_channel
*uchan
;
156 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
157 &iter
.iter
, uchan
, node
.node
) {
158 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
159 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
160 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
161 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
162 channels
[i
].attr
.switch_timer_interval
=
163 uchan
->attr
.switch_timer_interval
;
164 channels
[i
].attr
.read_timer_interval
=
165 uchan
->attr
.read_timer_interval
;
166 channels
[i
].enabled
= uchan
->enabled
;
167 switch (uchan
->attr
.output
) {
170 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
184 * Create a list of ust global domain events.
186 static int list_lttng_ust_global_events(char *channel_name
,
187 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
190 unsigned int nb_event
= 0;
191 struct lttng_ht_iter iter
;
192 struct lttng_ht_node_str
*node
;
193 struct ltt_ust_channel
*uchan
;
194 struct ltt_ust_event
*uevent
;
195 struct lttng_event
*tmp
;
197 DBG("Listing UST global events for channel %s", channel_name
);
201 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
202 node
= lttng_ht_iter_get_node_str(&iter
);
204 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
208 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
210 nb_event
+= lttng_ht_get_count(uchan
->events
);
217 DBG3("Listing UST global %d events", nb_event
);
219 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
221 ret
= LTTNG_ERR_FATAL
;
225 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
226 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
227 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
228 tmp
[i
].enabled
= uevent
->enabled
;
230 switch (uevent
->attr
.instrumentation
) {
231 case LTTNG_UST_TRACEPOINT
:
232 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
234 case LTTNG_UST_PROBE
:
235 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
237 case LTTNG_UST_FUNCTION
:
238 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
242 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
243 switch (uevent
->attr
.loglevel_type
) {
244 case LTTNG_UST_LOGLEVEL_ALL
:
245 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
247 case LTTNG_UST_LOGLEVEL_RANGE
:
248 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
250 case LTTNG_UST_LOGLEVEL_SINGLE
:
251 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
254 if (uevent
->filter
) {
269 * Fill lttng_event array of all kernel events in the channel.
271 static int list_lttng_kernel_events(char *channel_name
,
272 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
275 unsigned int nb_event
;
276 struct ltt_kernel_event
*event
;
277 struct ltt_kernel_channel
*kchan
;
279 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
281 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
285 nb_event
= kchan
->event_count
;
287 DBG("Listing events for channel %s", kchan
->channel
->name
);
293 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
294 if (*events
== NULL
) {
295 ret
= LTTNG_ERR_FATAL
;
299 /* Kernel channels */
300 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
301 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
302 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
303 (*events
)[i
].enabled
= event
->enabled
;
305 switch (event
->event
->instrumentation
) {
306 case LTTNG_KERNEL_TRACEPOINT
:
307 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
309 case LTTNG_KERNEL_KRETPROBE
:
310 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
311 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
312 sizeof(struct lttng_kernel_kprobe
));
314 case LTTNG_KERNEL_KPROBE
:
315 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
316 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
317 sizeof(struct lttng_kernel_kprobe
));
319 case LTTNG_KERNEL_FUNCTION
:
320 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
321 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
322 sizeof(struct lttng_kernel_function
));
324 case LTTNG_KERNEL_NOOP
:
325 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
327 case LTTNG_KERNEL_SYSCALL
:
328 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
330 case LTTNG_KERNEL_ALL
:
341 /* Negate the error code to differentiate the size from an error */
346 * Add URI so the consumer output object. Set the correct path depending on the
347 * domain adding the default trace directory.
349 static int add_uri_to_consumer(struct consumer_output
*consumer
,
350 struct lttng_uri
*uri
, int domain
, const char *session_name
)
353 const char *default_trace_dir
;
357 if (consumer
== NULL
) {
358 DBG("No consumer detected. Don't add URI. Stopping.");
359 ret
= LTTNG_ERR_NO_CONSUMER
;
364 case LTTNG_DOMAIN_KERNEL
:
365 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
367 case LTTNG_DOMAIN_UST
:
368 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
372 * This case is possible is we try to add the URI to the global tracing
373 * session consumer object which in this case there is no subdir.
375 default_trace_dir
= "";
378 switch (uri
->dtype
) {
381 DBG2("Setting network URI to consumer");
383 if (consumer
->type
== CONSUMER_DST_NET
) {
384 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
385 consumer
->dst
.net
.control_isset
) ||
386 (uri
->stype
== LTTNG_STREAM_DATA
&&
387 consumer
->dst
.net
.data_isset
)) {
388 ret
= LTTNG_ERR_URL_EXIST
;
392 memset(&consumer
->dst
.net
, 0, sizeof(consumer
->dst
.net
));
395 consumer
->type
= CONSUMER_DST_NET
;
397 /* Set URI into consumer output object */
398 ret
= consumer_set_network_uri(consumer
, uri
);
402 } else if (ret
== 1) {
404 * URI was the same in the consumer so we do not append the subdir
405 * again so to not duplicate output dir.
410 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
411 ret
= consumer_set_subdir(consumer
, session_name
);
413 ret
= LTTNG_ERR_FATAL
;
418 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
419 /* On a new subdir, reappend the default trace dir. */
420 strncat(consumer
->subdir
, default_trace_dir
,
421 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
422 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
427 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
428 memset(consumer
->dst
.trace_path
, 0,
429 sizeof(consumer
->dst
.trace_path
));
430 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
431 sizeof(consumer
->dst
.trace_path
));
432 /* Append default trace dir */
433 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
434 sizeof(consumer
->dst
.trace_path
) -
435 strlen(consumer
->dst
.trace_path
) - 1);
436 /* Flag consumer as local. */
437 consumer
->type
= CONSUMER_DST_LOCAL
;
448 * Init tracing by creating trace directory and sending fds kernel consumer.
450 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
453 struct lttng_ht_iter iter
;
454 struct consumer_socket
*socket
;
460 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
461 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
463 /* Code flow error */
464 assert(socket
->fd
>= 0);
466 pthread_mutex_lock(socket
->lock
);
467 ret
= kernel_consumer_send_session(socket
, session
);
468 pthread_mutex_unlock(socket
->lock
);
470 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
482 * Create a socket to the relayd using the URI.
484 * On success, the relayd_sock pointer is set to the created socket.
485 * Else, it's stays untouched and a lttcomm error code is returned.
487 static int create_connect_relayd(struct lttng_uri
*uri
,
488 struct lttcomm_relayd_sock
**relayd_sock
)
491 struct lttcomm_relayd_sock
*rsock
;
493 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
494 RELAYD_VERSION_COMM_MINOR
);
496 ret
= LTTNG_ERR_FATAL
;
501 * Connect to relayd so we can proceed with a session creation. This call
502 * can possibly block for an arbitrary amount of time to set the health
503 * state to be in poll execution.
506 ret
= relayd_connect(rsock
);
509 ERR("Unable to reach lttng-relayd");
510 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
514 /* Create socket for control stream. */
515 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
516 DBG3("Creating relayd stream socket from URI");
518 /* Check relayd version */
519 ret
= relayd_version_check(rsock
);
521 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
524 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
525 DBG3("Creating relayd data socket from URI");
527 /* Command is not valid */
528 ERR("Relayd invalid stream type: %d", uri
->stype
);
529 ret
= LTTNG_ERR_INVALID
;
533 *relayd_sock
= rsock
;
538 /* The returned value is not useful since we are on an error path. */
539 (void) relayd_close(rsock
);
547 * Connect to the relayd using URI and send the socket to the right consumer.
549 static int send_consumer_relayd_socket(int domain
, struct ltt_session
*session
,
550 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
551 struct consumer_socket
*consumer_sock
)
554 struct lttcomm_relayd_sock
*rsock
= NULL
;
556 /* Connect to relayd and make version check if uri is the control. */
557 ret
= create_connect_relayd(relayd_uri
, &rsock
);
558 if (ret
!= LTTNG_OK
) {
563 /* If the control socket is connected, network session is ready */
564 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
565 session
->net_handle
= 1;
568 /* Set the network sequence index if not set. */
569 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
570 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
572 * Increment net_seq_idx because we are about to transfer the
573 * new relayd socket to the consumer.
574 * Assign unique key so the consumer can match streams.
576 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
577 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
580 /* Send relayd socket to consumer. */
581 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
582 relayd_uri
->stype
, session
->id
);
584 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
588 /* Flag that the corresponding socket was sent. */
589 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
590 consumer_sock
->control_sock_sent
= 1;
591 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
592 consumer_sock
->data_sock_sent
= 1;
598 * Close socket which was dup on the consumer side. The session daemon does
599 * NOT keep track of the relayd socket(s) once transfer to the consumer.
603 (void) relayd_close(rsock
);
607 if (ret
!= LTTNG_OK
) {
609 * On error, nullify the consumer sequence index so streams are not
610 * associated with it once sent to the consumer.
612 uatomic_set(&consumer
->net_seq_index
, -1);
618 * Send both relayd sockets to a specific consumer and domain. This is a
619 * helper function to facilitate sending the information to the consumer for a
622 static int send_consumer_relayd_sockets(int domain
,
623 struct ltt_session
*session
, struct consumer_output
*consumer
,
624 struct consumer_socket
*sock
)
631 /* Sending control relayd socket. */
632 if (!sock
->control_sock_sent
) {
633 ret
= send_consumer_relayd_socket(domain
, session
,
634 &consumer
->dst
.net
.control
, consumer
, sock
);
635 if (ret
!= LTTNG_OK
) {
640 /* Sending data relayd socket. */
641 if (!sock
->data_sock_sent
) {
642 ret
= send_consumer_relayd_socket(domain
, session
,
643 &consumer
->dst
.net
.data
, consumer
, sock
);
644 if (ret
!= LTTNG_OK
) {
654 * Setup relayd connections for a tracing session. First creates the socket to
655 * the relayd and send them to the right domain consumer. Consumer type MUST be
658 int cmd_setup_relayd(struct ltt_session
*session
)
661 struct ltt_ust_session
*usess
;
662 struct ltt_kernel_session
*ksess
;
663 struct consumer_socket
*socket
;
664 struct lttng_ht_iter iter
;
668 usess
= session
->ust_session
;
669 ksess
= session
->kernel_session
;
671 DBG("Setting relayd for session %s", session
->name
);
675 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
676 && usess
->consumer
->enabled
) {
677 /* For each consumer socket, send relayd sockets */
678 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
680 /* Code flow error */
681 assert(socket
->fd
>= 0);
683 pthread_mutex_lock(socket
->lock
);
684 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
,
685 usess
->consumer
, socket
);
686 pthread_mutex_unlock(socket
->lock
);
687 if (ret
!= LTTNG_OK
) {
693 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
694 && ksess
->consumer
->enabled
) {
695 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
697 /* Code flow error */
698 assert(socket
->fd
>= 0);
700 pthread_mutex_lock(socket
->lock
);
701 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
,
702 ksess
->consumer
, socket
);
703 pthread_mutex_unlock(socket
->lock
);
704 if (ret
!= LTTNG_OK
) {
716 * Start a kernel session by opening all necessary streams.
718 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
721 struct ltt_kernel_channel
*kchan
;
723 /* Open kernel metadata */
724 if (ksess
->metadata
== NULL
) {
725 ret
= kernel_open_metadata(ksess
);
727 ret
= LTTNG_ERR_KERN_META_FAIL
;
732 /* Open kernel metadata stream */
733 if (ksess
->metadata_stream_fd
< 0) {
734 ret
= kernel_open_metadata_stream(ksess
);
736 ERR("Kernel create metadata stream failed");
737 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
742 /* For each channel */
743 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
744 if (kchan
->stream_count
== 0) {
745 ret
= kernel_open_channel_stream(kchan
);
747 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
750 /* Update the stream global counter */
751 ksess
->stream_count_global
+= ret
;
755 /* Setup kernel consumer socket and send fds to it */
756 ret
= init_kernel_tracing(ksess
);
758 ret
= LTTNG_ERR_KERN_START_FAIL
;
762 /* This start the kernel tracing */
763 ret
= kernel_start_session(ksess
);
765 ret
= LTTNG_ERR_KERN_START_FAIL
;
769 /* Quiescent wait after starting trace */
770 kernel_wait_quiescent(kernel_tracer_fd
);
781 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
783 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
787 struct ltt_ust_session
*usess
;
789 usess
= session
->ust_session
;
794 case LTTNG_DOMAIN_KERNEL
:
796 ret
= channel_kernel_disable(session
->kernel_session
,
798 if (ret
!= LTTNG_OK
) {
802 kernel_wait_quiescent(kernel_tracer_fd
);
805 case LTTNG_DOMAIN_UST
:
807 struct ltt_ust_channel
*uchan
;
808 struct lttng_ht
*chan_ht
;
810 chan_ht
= usess
->domain_global
.channels
;
812 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
814 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
818 ret
= channel_ust_disable(usess
, uchan
);
819 if (ret
!= LTTNG_OK
) {
825 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
826 case LTTNG_DOMAIN_UST_EXEC_NAME
:
827 case LTTNG_DOMAIN_UST_PID
:
830 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
842 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
844 * The wpipe arguments is used as a notifier for the kernel thread.
846 int cmd_enable_channel(struct ltt_session
*session
,
847 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
850 struct ltt_ust_session
*usess
= session
->ust_session
;
851 struct lttng_ht
*chan_ht
;
857 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
861 switch (domain
->type
) {
862 case LTTNG_DOMAIN_KERNEL
:
864 struct ltt_kernel_channel
*kchan
;
866 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
867 session
->kernel_session
);
869 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
871 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
874 if (ret
!= LTTNG_OK
) {
878 kernel_wait_quiescent(kernel_tracer_fd
);
881 * If the session was previously started, start as well this newly
882 * created kernel session so the events/channels enabled *after* the
883 * start actually work.
885 if (session
->started
&& !session
->kernel_session
->started
) {
886 ret
= start_kernel_session(session
->kernel_session
, wpipe
);
887 if (ret
!= LTTNG_OK
) {
893 case LTTNG_DOMAIN_UST
:
895 struct ltt_ust_channel
*uchan
;
897 chan_ht
= usess
->domain_global
.channels
;
899 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
901 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
903 ret
= channel_ust_enable(usess
, uchan
);
906 /* Start the UST session if the session was already started. */
907 if (session
->started
&& !usess
->start_trace
) {
908 ret
= ust_app_start_trace_all(usess
);
910 ret
= LTTNG_ERR_UST_START_FAIL
;
914 usess
->start_trace
= 1;
919 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
930 * Command LTTNG_DISABLE_EVENT processed by the client thread.
932 int cmd_disable_event(struct ltt_session
*session
, int domain
,
933 char *channel_name
, char *event_name
)
940 case LTTNG_DOMAIN_KERNEL
:
942 struct ltt_kernel_channel
*kchan
;
943 struct ltt_kernel_session
*ksess
;
945 ksess
= session
->kernel_session
;
947 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
949 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
953 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
954 if (ret
!= LTTNG_OK
) {
958 kernel_wait_quiescent(kernel_tracer_fd
);
961 case LTTNG_DOMAIN_UST
:
963 struct ltt_ust_channel
*uchan
;
964 struct ltt_ust_session
*usess
;
966 usess
= session
->ust_session
;
968 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
971 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
975 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
976 if (ret
!= LTTNG_OK
) {
980 DBG3("Disable UST event %s in channel %s completed", event_name
,
985 case LTTNG_DOMAIN_UST_EXEC_NAME
:
986 case LTTNG_DOMAIN_UST_PID
:
987 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1002 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1004 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
1012 case LTTNG_DOMAIN_KERNEL
:
1014 struct ltt_kernel_session
*ksess
;
1015 struct ltt_kernel_channel
*kchan
;
1017 ksess
= session
->kernel_session
;
1019 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1020 if (kchan
== NULL
) {
1021 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1025 ret
= event_kernel_disable_all(kchan
);
1026 if (ret
!= LTTNG_OK
) {
1030 kernel_wait_quiescent(kernel_tracer_fd
);
1033 case LTTNG_DOMAIN_UST
:
1035 struct ltt_ust_session
*usess
;
1036 struct ltt_ust_channel
*uchan
;
1038 usess
= session
->ust_session
;
1040 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1042 if (uchan
== NULL
) {
1043 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1047 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1052 DBG3("Disable all UST events in channel %s completed", channel_name
);
1057 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1058 case LTTNG_DOMAIN_UST_PID
:
1059 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1062 ret
= LTTNG_ERR_UND
;
1074 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1076 int cmd_add_context(struct ltt_session
*session
, int domain
,
1077 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1082 case LTTNG_DOMAIN_KERNEL
:
1083 assert(session
->kernel_session
);
1085 if (session
->kernel_session
->channel_count
== 0) {
1086 /* Create default channel */
1087 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1088 if (ret
!= LTTNG_OK
) {
1093 /* Add kernel context to kernel tracer */
1094 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1095 if (ret
!= LTTNG_OK
) {
1099 case LTTNG_DOMAIN_UST
:
1101 struct ltt_ust_session
*usess
= session
->ust_session
;
1104 unsigned int chan_count
=
1105 lttng_ht_get_count(usess
->domain_global
.channels
);
1106 if (chan_count
== 0) {
1107 struct lttng_channel
*attr
;
1108 /* Create default channel */
1109 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1111 ret
= LTTNG_ERR_FATAL
;
1115 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1116 if (ret
!= LTTNG_OK
) {
1123 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1124 if (ret
!= LTTNG_OK
) {
1130 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1131 case LTTNG_DOMAIN_UST_PID
:
1132 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1135 ret
= LTTNG_ERR_UND
;
1146 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1148 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1149 char *channel_name
, struct lttng_event
*event
,
1150 struct lttng_filter_bytecode
*filter
, int wpipe
)
1152 int ret
, channel_created
= 0;
1153 struct lttng_channel
*attr
;
1157 assert(channel_name
);
1161 switch (domain
->type
) {
1162 case LTTNG_DOMAIN_KERNEL
:
1164 struct ltt_kernel_channel
*kchan
;
1166 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1167 session
->kernel_session
);
1168 if (kchan
== NULL
) {
1169 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1170 LTTNG_BUFFER_GLOBAL
);
1172 ret
= LTTNG_ERR_FATAL
;
1175 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1177 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1178 if (ret
!= LTTNG_OK
) {
1184 channel_created
= 1;
1187 /* Get the newly created kernel channel pointer */
1188 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1189 session
->kernel_session
);
1190 if (kchan
== NULL
) {
1191 /* This sould not happen... */
1192 ret
= LTTNG_ERR_FATAL
;
1196 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1197 if (ret
!= LTTNG_OK
) {
1198 if (channel_created
) {
1199 /* Let's not leak a useless channel. */
1200 kernel_destroy_channel(kchan
);
1205 kernel_wait_quiescent(kernel_tracer_fd
);
1208 case LTTNG_DOMAIN_UST
:
1210 struct ltt_ust_channel
*uchan
;
1211 struct ltt_ust_session
*usess
= session
->ust_session
;
1215 /* Get channel from global UST domain */
1216 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1218 if (uchan
== NULL
) {
1219 /* Create default channel */
1220 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1221 usess
->buffer_type
);
1223 ret
= LTTNG_ERR_FATAL
;
1226 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1228 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1229 if (ret
!= LTTNG_OK
) {
1235 /* Get the newly created channel reference back */
1236 uchan
= trace_ust_find_channel_by_name(
1237 usess
->domain_global
.channels
, channel_name
);
1241 /* At this point, the session and channel exist on the tracer */
1242 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
, filter
);
1243 if (ret
!= LTTNG_OK
) {
1249 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1250 case LTTNG_DOMAIN_UST_PID
:
1251 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1254 ret
= LTTNG_ERR_UND
;
1266 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1268 int cmd_enable_event_all(struct ltt_session
*session
,
1269 struct lttng_domain
*domain
, char *channel_name
, int event_type
,
1270 struct lttng_filter_bytecode
*filter
, int wpipe
)
1273 struct lttng_channel
*attr
;
1276 assert(channel_name
);
1280 switch (domain
->type
) {
1281 case LTTNG_DOMAIN_KERNEL
:
1283 struct ltt_kernel_channel
*kchan
;
1285 assert(session
->kernel_session
);
1287 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1288 session
->kernel_session
);
1289 if (kchan
== NULL
) {
1290 /* Create default channel */
1291 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1292 LTTNG_BUFFER_GLOBAL
);
1294 ret
= LTTNG_ERR_FATAL
;
1297 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1299 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1300 if (ret
!= LTTNG_OK
) {
1306 /* Get the newly created kernel channel pointer */
1307 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1308 session
->kernel_session
);
1312 switch (event_type
) {
1313 case LTTNG_EVENT_SYSCALL
:
1314 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1316 case LTTNG_EVENT_TRACEPOINT
:
1318 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1319 * events already registered to the channel.
1321 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1323 case LTTNG_EVENT_ALL
:
1324 /* Enable syscalls and tracepoints */
1325 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1328 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1332 /* Manage return value */
1333 if (ret
!= LTTNG_OK
) {
1335 * On error, cmd_enable_channel call will take care of destroying
1336 * the created channel if it was needed.
1341 kernel_wait_quiescent(kernel_tracer_fd
);
1344 case LTTNG_DOMAIN_UST
:
1346 struct ltt_ust_channel
*uchan
;
1347 struct ltt_ust_session
*usess
= session
->ust_session
;
1351 /* Get channel from global UST domain */
1352 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1354 if (uchan
== NULL
) {
1355 /* Create default channel */
1356 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1357 usess
->buffer_type
);
1359 ret
= LTTNG_ERR_FATAL
;
1362 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1364 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1365 if (ret
!= LTTNG_OK
) {
1371 /* Get the newly created channel reference back */
1372 uchan
= trace_ust_find_channel_by_name(
1373 usess
->domain_global
.channels
, channel_name
);
1377 /* At this point, the session and channel exist on the tracer */
1379 switch (event_type
) {
1380 case LTTNG_EVENT_ALL
:
1381 case LTTNG_EVENT_TRACEPOINT
:
1382 ret
= event_ust_enable_all_tracepoints(usess
, uchan
, filter
);
1383 if (ret
!= LTTNG_OK
) {
1388 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1392 /* Manage return value */
1393 if (ret
!= LTTNG_OK
) {
1400 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1401 case LTTNG_DOMAIN_UST_PID
:
1402 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1405 ret
= LTTNG_ERR_UND
;
1418 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1420 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1423 ssize_t nb_events
= 0;
1426 case LTTNG_DOMAIN_KERNEL
:
1427 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1428 if (nb_events
< 0) {
1429 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1433 case LTTNG_DOMAIN_UST
:
1434 nb_events
= ust_app_list_events(events
);
1435 if (nb_events
< 0) {
1436 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1441 ret
= LTTNG_ERR_UND
;
1448 /* Return negative value to differentiate return code */
1453 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1455 ssize_t
cmd_list_tracepoint_fields(int domain
,
1456 struct lttng_event_field
**fields
)
1459 ssize_t nb_fields
= 0;
1462 case LTTNG_DOMAIN_UST
:
1463 nb_fields
= ust_app_list_event_fields(fields
);
1464 if (nb_fields
< 0) {
1465 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1469 case LTTNG_DOMAIN_KERNEL
:
1470 default: /* fall-through */
1471 ret
= LTTNG_ERR_UND
;
1478 /* Return negative value to differentiate return code */
1483 * Command LTTNG_START_TRACE processed by the client thread.
1485 int cmd_start_trace(struct ltt_session
*session
)
1488 struct ltt_kernel_session
*ksession
;
1489 struct ltt_ust_session
*usess
;
1493 /* Ease our life a bit ;) */
1494 ksession
= session
->kernel_session
;
1495 usess
= session
->ust_session
;
1497 if (session
->enabled
) {
1498 /* Already started. */
1499 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1503 session
->enabled
= 1;
1505 /* Kernel tracing */
1506 if (ksession
!= NULL
) {
1507 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1508 if (ret
!= LTTNG_OK
) {
1513 /* Flag session that trace should start automatically */
1515 usess
->start_trace
= 1;
1517 ret
= ust_app_start_trace_all(usess
);
1519 ret
= LTTNG_ERR_UST_START_FAIL
;
1524 session
->started
= 1;
1533 * Command LTTNG_STOP_TRACE processed by the client thread.
1535 int cmd_stop_trace(struct ltt_session
*session
)
1538 struct ltt_kernel_channel
*kchan
;
1539 struct ltt_kernel_session
*ksession
;
1540 struct ltt_ust_session
*usess
;
1545 ksession
= session
->kernel_session
;
1546 usess
= session
->ust_session
;
1548 if (!session
->enabled
) {
1549 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1553 session
->enabled
= 0;
1557 DBG("Stop kernel tracing");
1559 /* Flush metadata if exist */
1560 if (ksession
->metadata_stream_fd
>= 0) {
1561 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1563 ERR("Kernel metadata flush failed");
1567 /* Flush all buffers before stopping */
1568 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1569 ret
= kernel_flush_buffer(kchan
);
1571 ERR("Kernel flush buffer error");
1575 ret
= kernel_stop_session(ksession
);
1577 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1581 kernel_wait_quiescent(kernel_tracer_fd
);
1583 ksession
->started
= 0;
1587 usess
->start_trace
= 0;
1589 ret
= ust_app_stop_trace_all(usess
);
1591 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1596 session
->started
= 0;
1605 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1607 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1608 size_t nb_uri
, struct lttng_uri
*uris
)
1611 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1612 struct ltt_ust_session
*usess
= session
->ust_session
;
1613 struct consumer_output
*consumer
= NULL
;
1619 /* Can't enable consumer after session started. */
1620 if (session
->enabled
) {
1621 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1626 * This case switch makes sure the domain session has a temporary consumer
1627 * so the URL can be set.
1631 /* Code flow error. A session MUST always have a consumer object */
1632 assert(session
->consumer
);
1634 * The URL will be added to the tracing session consumer instead of a
1635 * specific domain consumer.
1637 consumer
= session
->consumer
;
1639 case LTTNG_DOMAIN_KERNEL
:
1640 /* Code flow error if we don't have a kernel session here. */
1642 assert(ksess
->consumer
);
1643 consumer
= ksess
->consumer
;
1645 case LTTNG_DOMAIN_UST
:
1646 /* Code flow error if we don't have a kernel session here. */
1648 assert(usess
->consumer
);
1649 consumer
= usess
->consumer
;
1653 for (i
= 0; i
< nb_uri
; i
++) {
1654 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1655 if (ret
!= LTTNG_OK
) {
1668 * Command LTTNG_CREATE_SESSION processed by the client thread.
1670 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1671 size_t nb_uri
, lttng_sock_cred
*creds
)
1674 struct ltt_session
*session
;
1678 /* No URIs is not possible. */
1680 ret
= LTTNG_ERR_SESSION_FAIL
;
1685 * Verify if the session already exist
1687 * XXX: There is no need for the session lock list here since the caller
1688 * (process_client_msg) is holding it. We might want to change that so a
1689 * single command does not lock the entire session list.
1691 session
= session_find_by_name(name
);
1692 if (session
!= NULL
) {
1693 ret
= LTTNG_ERR_EXIST_SESS
;
1697 /* Create tracing session in the registry */
1698 ret
= session_create(name
, LTTNG_SOCK_GET_UID_CRED(creds
),
1699 LTTNG_SOCK_GET_GID_CRED(creds
));
1700 if (ret
!= LTTNG_OK
) {
1705 * Get the newly created session pointer back
1707 * XXX: There is no need for the session lock list here since the caller
1708 * (process_client_msg) is holding it. We might want to change that so a
1709 * single command does not lock the entire session list.
1711 session
= session_find_by_name(name
);
1714 /* Create default consumer output for the session not yet created. */
1715 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1716 if (session
->consumer
== NULL
) {
1717 ret
= LTTNG_ERR_FATAL
;
1718 goto consumer_error
;
1721 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1722 if (ret
!= LTTNG_OK
) {
1723 goto consumer_error
;
1726 session
->consumer
->enabled
= 1;
1731 session_destroy(session
);
1738 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1740 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1743 struct ltt_ust_session
*usess
;
1744 struct ltt_kernel_session
*ksess
;
1749 usess
= session
->ust_session
;
1750 ksess
= session
->kernel_session
;
1752 /* Clean kernel session teardown */
1753 kernel_destroy_session(ksess
);
1755 /* UST session teardown */
1757 /* Close any relayd session */
1758 consumer_output_send_destroy_relayd(usess
->consumer
);
1760 /* Destroy every UST application related to this session. */
1761 ret
= ust_app_destroy_trace_all(usess
);
1763 ERR("Error in ust_app_destroy_trace_all");
1766 /* Clean up the rest. */
1767 trace_ust_destroy_session(usess
);
1771 * Must notify the kernel thread here to update it's poll set in order to
1772 * remove the channel(s)' fd just destroyed.
1774 ret
= notify_thread_pipe(wpipe
);
1776 PERROR("write kernel poll pipe");
1779 ret
= session_destroy(session
);
1785 * Command LTTNG_CALIBRATE processed by the client thread.
1787 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1792 case LTTNG_DOMAIN_KERNEL
:
1794 struct lttng_kernel_calibrate kcalibrate
;
1796 kcalibrate
.type
= calibrate
->type
;
1797 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1799 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1804 case LTTNG_DOMAIN_UST
:
1806 struct lttng_ust_calibrate ucalibrate
;
1808 ucalibrate
.type
= calibrate
->type
;
1809 ret
= ust_app_calibrate_glb(&ucalibrate
);
1811 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1817 ret
= LTTNG_ERR_UND
;
1828 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1830 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1831 const char *sock_path
, struct consumer_data
*cdata
)
1834 struct consumer_socket
*socket
= NULL
;
1841 case LTTNG_DOMAIN_KERNEL
:
1843 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1847 /* Can't register a consumer if there is already one */
1848 if (ksess
->consumer_fds_sent
!= 0) {
1849 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1853 sock
= lttcomm_connect_unix_sock(sock_path
);
1855 ret
= LTTNG_ERR_CONNECT_FAIL
;
1859 socket
= consumer_allocate_socket(sock
);
1860 if (socket
== NULL
) {
1863 PERROR("close register consumer");
1865 ret
= LTTNG_ERR_FATAL
;
1869 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1870 if (socket
->lock
== NULL
) {
1871 PERROR("zmalloc pthread mutex");
1872 ret
= LTTNG_ERR_FATAL
;
1875 pthread_mutex_init(socket
->lock
, NULL
);
1876 socket
->registered
= 1;
1879 consumer_add_socket(socket
, ksess
->consumer
);
1882 pthread_mutex_lock(&cdata
->pid_mutex
);
1884 pthread_mutex_unlock(&cdata
->pid_mutex
);
1889 /* TODO: Userspace tracing */
1890 ret
= LTTNG_ERR_UND
;
1898 consumer_destroy_socket(socket
);
1904 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1906 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1907 struct lttng_domain
**domains
)
1912 if (session
->kernel_session
!= NULL
) {
1913 DBG3("Listing domains found kernel domain");
1917 if (session
->ust_session
!= NULL
) {
1918 DBG3("Listing domains found UST global domain");
1922 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1923 if (*domains
== NULL
) {
1924 ret
= LTTNG_ERR_FATAL
;
1928 if (session
->kernel_session
!= NULL
) {
1929 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1933 if (session
->ust_session
!= NULL
) {
1934 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1935 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
1942 /* Return negative value to differentiate return code */
1948 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1950 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1951 struct lttng_channel
**channels
)
1954 ssize_t nb_chan
= 0;
1957 case LTTNG_DOMAIN_KERNEL
:
1958 if (session
->kernel_session
!= NULL
) {
1959 nb_chan
= session
->kernel_session
->channel_count
;
1961 DBG3("Number of kernel channels %zd", nb_chan
);
1963 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1966 case LTTNG_DOMAIN_UST
:
1967 if (session
->ust_session
!= NULL
) {
1968 nb_chan
= lttng_ht_get_count(
1969 session
->ust_session
->domain_global
.channels
);
1971 DBG3("Number of UST global channels %zd", nb_chan
);
1973 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1978 ret
= LTTNG_ERR_UND
;
1983 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
1984 if (*channels
== NULL
) {
1985 ret
= LTTNG_ERR_FATAL
;
1989 list_lttng_channels(domain
, session
, *channels
);
1992 /* Ret value was set in the domain switch case */
1999 /* Return negative value to differentiate return code */
2004 * Command LTTNG_LIST_EVENTS processed by the client thread.
2006 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2007 char *channel_name
, struct lttng_event
**events
)
2010 ssize_t nb_event
= 0;
2013 case LTTNG_DOMAIN_KERNEL
:
2014 if (session
->kernel_session
!= NULL
) {
2015 nb_event
= list_lttng_kernel_events(channel_name
,
2016 session
->kernel_session
, events
);
2019 case LTTNG_DOMAIN_UST
:
2021 if (session
->ust_session
!= NULL
) {
2022 nb_event
= list_lttng_ust_global_events(channel_name
,
2023 &session
->ust_session
->domain_global
, events
);
2028 ret
= LTTNG_ERR_UND
;
2035 /* Return negative value to differentiate return code */
2040 * Using the session list, filled a lttng_session array to send back to the
2041 * client for session listing.
2043 * The session list lock MUST be acquired before calling this function. Use
2044 * session_lock_list() and session_unlock_list().
2046 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2051 struct ltt_session
*session
;
2052 struct ltt_session_list
*list
= session_get_list();
2054 DBG("Getting all available session for UID %d GID %d",
2057 * Iterate over session list and append data after the control struct in
2060 cds_list_for_each_entry(session
, &list
->head
, list
) {
2062 * Only list the sessions the user can control.
2064 if (!session_access_ok(session
, uid
, gid
)) {
2068 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2069 struct ltt_ust_session
*usess
= session
->ust_session
;
2071 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2072 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2073 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2074 ret
= build_network_session_path(sessions
[i
].path
,
2075 sizeof(sessions
[i
].path
), session
);
2077 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
2078 session
->consumer
->dst
.trace_path
);
2081 PERROR("snprintf session path");
2085 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2086 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2087 sessions
[i
].enabled
= session
->enabled
;
2093 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2094 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2096 int cmd_data_pending(struct ltt_session
*session
)
2099 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2100 struct ltt_ust_session
*usess
= session
->ust_session
;
2104 /* Session MUST be stopped to ask for data availability. */
2105 if (session
->enabled
) {
2106 ret
= LTTNG_ERR_SESSION_STARTED
;
2110 if (ksess
&& ksess
->consumer
) {
2111 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2113 /* Data is still being extracted for the kernel. */
2118 if (usess
&& usess
->consumer
) {
2119 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2121 /* Data is still being extracted for the kernel. */
2126 /* Data is ready to be read by a viewer */
2134 * Init command subsystem.
2139 * Set network sequence index to 1 for streams to match a relayd
2140 * socket on the consumer side.
2142 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
2143 relayd_net_seq_idx
= 1;
2144 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
2146 DBG("Command subsystem initialized");