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
);
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
);
400 ret
= LTTNG_ERR_FATAL
;
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
;
446 * Init tracing by creating trace directory and sending fds kernel consumer.
448 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
451 struct lttng_ht_iter iter
;
452 struct consumer_socket
*socket
;
458 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
459 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
461 /* Code flow error */
462 assert(socket
->fd
>= 0);
464 pthread_mutex_lock(socket
->lock
);
465 ret
= kernel_consumer_send_session(socket
, session
);
466 pthread_mutex_unlock(socket
->lock
);
468 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
480 * Create a socket to the relayd using the URI.
482 * On success, the relayd_sock pointer is set to the created socket.
483 * Else, it's stays untouched and a lttcomm error code is returned.
485 static int create_connect_relayd(struct lttng_uri
*uri
,
486 struct lttcomm_relayd_sock
**relayd_sock
)
489 struct lttcomm_relayd_sock
*rsock
;
491 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
492 RELAYD_VERSION_COMM_MINOR
);
494 ret
= LTTNG_ERR_FATAL
;
499 * Connect to relayd so we can proceed with a session creation. This call
500 * can possibly block for an arbitrary amount of time to set the health
501 * state to be in poll execution.
504 ret
= relayd_connect(rsock
);
507 ERR("Unable to reach lttng-relayd");
508 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
512 /* Create socket for control stream. */
513 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
514 DBG3("Creating relayd stream socket from URI");
516 /* Check relayd version */
517 ret
= relayd_version_check(rsock
);
519 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
522 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
523 DBG3("Creating relayd data socket from URI");
525 /* Command is not valid */
526 ERR("Relayd invalid stream type: %d", uri
->stype
);
527 ret
= LTTNG_ERR_INVALID
;
531 *relayd_sock
= rsock
;
536 /* The returned value is not useful since we are on an error path. */
537 (void) relayd_close(rsock
);
545 * Connect to the relayd using URI and send the socket to the right consumer.
547 static int send_consumer_relayd_socket(int domain
, struct ltt_session
*session
,
548 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
549 struct consumer_socket
*consumer_sock
)
552 struct lttcomm_relayd_sock
*rsock
= NULL
;
554 /* Connect to relayd and make version check if uri is the control. */
555 ret
= create_connect_relayd(relayd_uri
, &rsock
);
556 if (ret
!= LTTNG_OK
) {
561 /* If the control socket is connected, network session is ready */
562 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
563 session
->net_handle
= 1;
566 /* Set the network sequence index if not set. */
567 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
568 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
570 * Increment net_seq_idx because we are about to transfer the
571 * new relayd socket to the consumer.
572 * Assign unique key so the consumer can match streams.
574 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
575 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
578 /* Send relayd socket to consumer. */
579 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
580 relayd_uri
->stype
, session
->id
);
582 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
586 /* Flag that the corresponding socket was sent. */
587 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
588 consumer_sock
->control_sock_sent
= 1;
589 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
590 consumer_sock
->data_sock_sent
= 1;
596 * Close socket which was dup on the consumer side. The session daemon does
597 * NOT keep track of the relayd socket(s) once transfer to the consumer.
601 (void) relayd_close(rsock
);
605 if (ret
!= LTTNG_OK
) {
607 * On error, nullify the consumer sequence index so streams are not
608 * associated with it once sent to the consumer.
610 uatomic_set(&consumer
->net_seq_index
, -1);
616 * Send both relayd sockets to a specific consumer and domain. This is a
617 * helper function to facilitate sending the information to the consumer for a
620 static int send_consumer_relayd_sockets(int domain
,
621 struct ltt_session
*session
, struct consumer_output
*consumer
,
622 struct consumer_socket
*sock
)
629 /* Sending control relayd socket. */
630 if (!sock
->control_sock_sent
) {
631 ret
= send_consumer_relayd_socket(domain
, session
,
632 &consumer
->dst
.net
.control
, consumer
, sock
);
633 if (ret
!= LTTNG_OK
) {
638 /* Sending data relayd socket. */
639 if (!sock
->data_sock_sent
) {
640 ret
= send_consumer_relayd_socket(domain
, session
,
641 &consumer
->dst
.net
.data
, consumer
, sock
);
642 if (ret
!= LTTNG_OK
) {
652 * Setup relayd connections for a tracing session. First creates the socket to
653 * the relayd and send them to the right domain consumer. Consumer type MUST be
656 int cmd_setup_relayd(struct ltt_session
*session
)
659 struct ltt_ust_session
*usess
;
660 struct ltt_kernel_session
*ksess
;
661 struct consumer_socket
*socket
;
662 struct lttng_ht_iter iter
;
666 usess
= session
->ust_session
;
667 ksess
= session
->kernel_session
;
669 DBG("Setting relayd for session %s", session
->name
);
673 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
674 && usess
->consumer
->enabled
) {
675 /* For each consumer socket, send relayd sockets */
676 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
678 /* Code flow error */
679 assert(socket
->fd
>= 0);
681 pthread_mutex_lock(socket
->lock
);
682 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
,
683 usess
->consumer
, socket
);
684 pthread_mutex_unlock(socket
->lock
);
685 if (ret
!= LTTNG_OK
) {
691 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
692 && ksess
->consumer
->enabled
) {
693 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
695 /* Code flow error */
696 assert(socket
->fd
>= 0);
698 pthread_mutex_lock(socket
->lock
);
699 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
,
700 ksess
->consumer
, socket
);
701 pthread_mutex_unlock(socket
->lock
);
702 if (ret
!= LTTNG_OK
) {
714 * Start a kernel session by opening all necessary streams.
716 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
719 struct ltt_kernel_channel
*kchan
;
721 /* Open kernel metadata */
722 if (ksess
->metadata
== NULL
) {
723 ret
= kernel_open_metadata(ksess
);
725 ret
= LTTNG_ERR_KERN_META_FAIL
;
730 /* Open kernel metadata stream */
731 if (ksess
->metadata_stream_fd
< 0) {
732 ret
= kernel_open_metadata_stream(ksess
);
734 ERR("Kernel create metadata stream failed");
735 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
740 /* For each channel */
741 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
742 if (kchan
->stream_count
== 0) {
743 ret
= kernel_open_channel_stream(kchan
);
745 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
748 /* Update the stream global counter */
749 ksess
->stream_count_global
+= ret
;
753 /* Setup kernel consumer socket and send fds to it */
754 ret
= init_kernel_tracing(ksess
);
756 ret
= LTTNG_ERR_KERN_START_FAIL
;
760 /* This start the kernel tracing */
761 ret
= kernel_start_session(ksess
);
763 ret
= LTTNG_ERR_KERN_START_FAIL
;
767 /* Quiescent wait after starting trace */
768 kernel_wait_quiescent(kernel_tracer_fd
);
779 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
781 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
785 struct ltt_ust_session
*usess
;
787 usess
= session
->ust_session
;
792 case LTTNG_DOMAIN_KERNEL
:
794 ret
= channel_kernel_disable(session
->kernel_session
,
796 if (ret
!= LTTNG_OK
) {
800 kernel_wait_quiescent(kernel_tracer_fd
);
803 case LTTNG_DOMAIN_UST
:
805 struct ltt_ust_channel
*uchan
;
806 struct lttng_ht
*chan_ht
;
808 chan_ht
= usess
->domain_global
.channels
;
810 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
812 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
816 ret
= channel_ust_disable(usess
, uchan
);
817 if (ret
!= LTTNG_OK
) {
823 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
824 case LTTNG_DOMAIN_UST_EXEC_NAME
:
825 case LTTNG_DOMAIN_UST_PID
:
828 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
840 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
842 * The wpipe arguments is used as a notifier for the kernel thread.
844 int cmd_enable_channel(struct ltt_session
*session
,
845 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
848 struct ltt_ust_session
*usess
= session
->ust_session
;
849 struct lttng_ht
*chan_ht
;
855 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
859 switch (domain
->type
) {
860 case LTTNG_DOMAIN_KERNEL
:
862 struct ltt_kernel_channel
*kchan
;
864 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
865 session
->kernel_session
);
867 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
869 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
872 if (ret
!= LTTNG_OK
) {
876 kernel_wait_quiescent(kernel_tracer_fd
);
879 * If the session was previously started, start as well this newly
880 * created kernel session so the events/channels enabled *after* the
881 * start actually work.
883 if (session
->started
&& !session
->kernel_session
->started
) {
884 ret
= start_kernel_session(session
->kernel_session
, wpipe
);
885 if (ret
!= LTTNG_OK
) {
891 case LTTNG_DOMAIN_UST
:
893 struct ltt_ust_channel
*uchan
;
895 chan_ht
= usess
->domain_global
.channels
;
897 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
899 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
901 ret
= channel_ust_enable(usess
, uchan
);
904 /* Start the UST session if the session was already started. */
905 if (session
->started
&& !usess
->start_trace
) {
906 ret
= ust_app_start_trace_all(usess
);
908 ret
= LTTNG_ERR_UST_START_FAIL
;
912 usess
->start_trace
= 1;
917 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
928 * Command LTTNG_DISABLE_EVENT processed by the client thread.
930 int cmd_disable_event(struct ltt_session
*session
, int domain
,
931 char *channel_name
, char *event_name
)
938 case LTTNG_DOMAIN_KERNEL
:
940 struct ltt_kernel_channel
*kchan
;
941 struct ltt_kernel_session
*ksess
;
943 ksess
= session
->kernel_session
;
945 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
947 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
951 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
952 if (ret
!= LTTNG_OK
) {
956 kernel_wait_quiescent(kernel_tracer_fd
);
959 case LTTNG_DOMAIN_UST
:
961 struct ltt_ust_channel
*uchan
;
962 struct ltt_ust_session
*usess
;
964 usess
= session
->ust_session
;
966 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
969 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
973 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
974 if (ret
!= LTTNG_OK
) {
978 DBG3("Disable UST event %s in channel %s completed", event_name
,
983 case LTTNG_DOMAIN_UST_EXEC_NAME
:
984 case LTTNG_DOMAIN_UST_PID
:
985 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1000 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1002 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
1010 case LTTNG_DOMAIN_KERNEL
:
1012 struct ltt_kernel_session
*ksess
;
1013 struct ltt_kernel_channel
*kchan
;
1015 ksess
= session
->kernel_session
;
1017 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1018 if (kchan
== NULL
) {
1019 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1023 ret
= event_kernel_disable_all(kchan
);
1024 if (ret
!= LTTNG_OK
) {
1028 kernel_wait_quiescent(kernel_tracer_fd
);
1031 case LTTNG_DOMAIN_UST
:
1033 struct ltt_ust_session
*usess
;
1034 struct ltt_ust_channel
*uchan
;
1036 usess
= session
->ust_session
;
1038 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1040 if (uchan
== NULL
) {
1041 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1045 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1050 DBG3("Disable all UST events in channel %s completed", channel_name
);
1055 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1056 case LTTNG_DOMAIN_UST_PID
:
1057 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1060 ret
= LTTNG_ERR_UND
;
1072 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1074 int cmd_add_context(struct ltt_session
*session
, int domain
,
1075 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1080 case LTTNG_DOMAIN_KERNEL
:
1081 assert(session
->kernel_session
);
1083 if (session
->kernel_session
->channel_count
== 0) {
1084 /* Create default channel */
1085 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1086 if (ret
!= LTTNG_OK
) {
1091 /* Add kernel context to kernel tracer */
1092 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1093 if (ret
!= LTTNG_OK
) {
1097 case LTTNG_DOMAIN_UST
:
1099 struct ltt_ust_session
*usess
= session
->ust_session
;
1102 unsigned int chan_count
=
1103 lttng_ht_get_count(usess
->domain_global
.channels
);
1104 if (chan_count
== 0) {
1105 struct lttng_channel
*attr
;
1106 /* Create default channel */
1107 attr
= channel_new_default_attr(domain
);
1109 ret
= LTTNG_ERR_FATAL
;
1113 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1114 if (ret
!= LTTNG_OK
) {
1121 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1122 if (ret
!= LTTNG_OK
) {
1128 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1129 case LTTNG_DOMAIN_UST_PID
:
1130 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1133 ret
= LTTNG_ERR_UND
;
1144 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1146 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1147 char *channel_name
, struct lttng_event
*event
,
1148 struct lttng_filter_bytecode
*filter
, int wpipe
)
1150 int ret
, channel_created
= 0;
1151 struct lttng_channel
*attr
;
1155 assert(channel_name
);
1159 switch (domain
->type
) {
1160 case LTTNG_DOMAIN_KERNEL
:
1162 struct ltt_kernel_channel
*kchan
;
1164 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1165 session
->kernel_session
);
1166 if (kchan
== NULL
) {
1167 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
);
1169 ret
= LTTNG_ERR_FATAL
;
1172 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1174 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1175 if (ret
!= LTTNG_OK
) {
1181 channel_created
= 1;
1184 /* Get the newly created kernel channel pointer */
1185 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1186 session
->kernel_session
);
1187 if (kchan
== NULL
) {
1188 /* This sould not happen... */
1189 ret
= LTTNG_ERR_FATAL
;
1193 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1194 if (ret
!= LTTNG_OK
) {
1195 if (channel_created
) {
1196 /* Let's not leak a useless channel. */
1197 kernel_destroy_channel(kchan
);
1202 kernel_wait_quiescent(kernel_tracer_fd
);
1205 case LTTNG_DOMAIN_UST
:
1207 struct ltt_ust_channel
*uchan
;
1208 struct ltt_ust_session
*usess
= session
->ust_session
;
1212 /* Get channel from global UST domain */
1213 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1215 if (uchan
== NULL
) {
1216 /* Create default channel */
1217 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
);
1219 ret
= LTTNG_ERR_FATAL
;
1222 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1224 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1225 if (ret
!= LTTNG_OK
) {
1231 /* Get the newly created channel reference back */
1232 uchan
= trace_ust_find_channel_by_name(
1233 usess
->domain_global
.channels
, channel_name
);
1237 /* At this point, the session and channel exist on the tracer */
1238 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
, filter
);
1239 if (ret
!= LTTNG_OK
) {
1245 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1246 case LTTNG_DOMAIN_UST_PID
:
1247 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1250 ret
= LTTNG_ERR_UND
;
1262 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1264 int cmd_enable_event_all(struct ltt_session
*session
,
1265 struct lttng_domain
*domain
, char *channel_name
, int event_type
,
1266 struct lttng_filter_bytecode
*filter
, int wpipe
)
1269 struct lttng_channel
*attr
;
1272 assert(channel_name
);
1276 switch (domain
->type
) {
1277 case LTTNG_DOMAIN_KERNEL
:
1279 struct ltt_kernel_channel
*kchan
;
1281 assert(session
->kernel_session
);
1283 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1284 session
->kernel_session
);
1285 if (kchan
== NULL
) {
1286 /* Create default channel */
1287 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
);
1289 ret
= LTTNG_ERR_FATAL
;
1292 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1294 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1295 if (ret
!= LTTNG_OK
) {
1301 /* Get the newly created kernel channel pointer */
1302 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1303 session
->kernel_session
);
1307 switch (event_type
) {
1308 case LTTNG_EVENT_SYSCALL
:
1309 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1311 case LTTNG_EVENT_TRACEPOINT
:
1313 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1314 * events already registered to the channel.
1316 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1318 case LTTNG_EVENT_ALL
:
1319 /* Enable syscalls and tracepoints */
1320 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1323 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1327 /* Manage return value */
1328 if (ret
!= LTTNG_OK
) {
1330 * On error, cmd_enable_channel call will take care of destroying
1331 * the created channel if it was needed.
1336 kernel_wait_quiescent(kernel_tracer_fd
);
1339 case LTTNG_DOMAIN_UST
:
1341 struct ltt_ust_channel
*uchan
;
1342 struct ltt_ust_session
*usess
= session
->ust_session
;
1346 /* Get channel from global UST domain */
1347 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1349 if (uchan
== NULL
) {
1350 /* Create default channel */
1351 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
);
1353 ret
= LTTNG_ERR_FATAL
;
1356 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1358 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1359 if (ret
!= LTTNG_OK
) {
1365 /* Get the newly created channel reference back */
1366 uchan
= trace_ust_find_channel_by_name(
1367 usess
->domain_global
.channels
, channel_name
);
1371 /* At this point, the session and channel exist on the tracer */
1373 switch (event_type
) {
1374 case LTTNG_EVENT_ALL
:
1375 case LTTNG_EVENT_TRACEPOINT
:
1376 ret
= event_ust_enable_all_tracepoints(usess
, uchan
, filter
);
1377 if (ret
!= LTTNG_OK
) {
1382 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1386 /* Manage return value */
1387 if (ret
!= LTTNG_OK
) {
1394 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1395 case LTTNG_DOMAIN_UST_PID
:
1396 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1399 ret
= LTTNG_ERR_UND
;
1412 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1414 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1417 ssize_t nb_events
= 0;
1420 case LTTNG_DOMAIN_KERNEL
:
1421 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1422 if (nb_events
< 0) {
1423 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1427 case LTTNG_DOMAIN_UST
:
1428 nb_events
= ust_app_list_events(events
);
1429 if (nb_events
< 0) {
1430 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1435 ret
= LTTNG_ERR_UND
;
1442 /* Return negative value to differentiate return code */
1447 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1449 ssize_t
cmd_list_tracepoint_fields(int domain
,
1450 struct lttng_event_field
**fields
)
1453 ssize_t nb_fields
= 0;
1456 case LTTNG_DOMAIN_UST
:
1457 nb_fields
= ust_app_list_event_fields(fields
);
1458 if (nb_fields
< 0) {
1459 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1463 case LTTNG_DOMAIN_KERNEL
:
1464 default: /* fall-through */
1465 ret
= LTTNG_ERR_UND
;
1472 /* Return negative value to differentiate return code */
1477 * Command LTTNG_START_TRACE processed by the client thread.
1479 int cmd_start_trace(struct ltt_session
*session
)
1482 struct ltt_kernel_session
*ksession
;
1483 struct ltt_ust_session
*usess
;
1487 /* Ease our life a bit ;) */
1488 ksession
= session
->kernel_session
;
1489 usess
= session
->ust_session
;
1491 if (session
->enabled
) {
1492 /* Already started. */
1493 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1497 session
->enabled
= 1;
1499 /* Kernel tracing */
1500 if (ksession
!= NULL
) {
1501 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1502 if (ret
!= LTTNG_OK
) {
1507 /* Flag session that trace should start automatically */
1509 usess
->start_trace
= 1;
1511 ret
= ust_app_start_trace_all(usess
);
1513 ret
= LTTNG_ERR_UST_START_FAIL
;
1518 session
->started
= 1;
1527 * Command LTTNG_STOP_TRACE processed by the client thread.
1529 int cmd_stop_trace(struct ltt_session
*session
)
1532 struct ltt_kernel_channel
*kchan
;
1533 struct ltt_kernel_session
*ksession
;
1534 struct ltt_ust_session
*usess
;
1539 ksession
= session
->kernel_session
;
1540 usess
= session
->ust_session
;
1542 if (!session
->enabled
) {
1543 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1547 session
->enabled
= 0;
1551 DBG("Stop kernel tracing");
1553 /* Flush metadata if exist */
1554 if (ksession
->metadata_stream_fd
>= 0) {
1555 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1557 ERR("Kernel metadata flush failed");
1561 /* Flush all buffers before stopping */
1562 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1563 ret
= kernel_flush_buffer(kchan
);
1565 ERR("Kernel flush buffer error");
1569 ret
= kernel_stop_session(ksession
);
1571 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1575 kernel_wait_quiescent(kernel_tracer_fd
);
1577 ksession
->started
= 0;
1581 usess
->start_trace
= 0;
1583 ret
= ust_app_stop_trace_all(usess
);
1585 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1590 session
->started
= 0;
1599 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1601 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1602 size_t nb_uri
, struct lttng_uri
*uris
)
1605 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1606 struct ltt_ust_session
*usess
= session
->ust_session
;
1607 struct consumer_output
*consumer
= NULL
;
1613 /* Can't enable consumer after session started. */
1614 if (session
->enabled
) {
1615 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1620 * This case switch makes sure the domain session has a temporary consumer
1621 * so the URL can be set.
1625 /* Code flow error. A session MUST always have a consumer object */
1626 assert(session
->consumer
);
1628 * The URL will be added to the tracing session consumer instead of a
1629 * specific domain consumer.
1631 consumer
= session
->consumer
;
1633 case LTTNG_DOMAIN_KERNEL
:
1634 /* Code flow error if we don't have a kernel session here. */
1636 assert(ksess
->consumer
);
1637 consumer
= ksess
->consumer
;
1639 case LTTNG_DOMAIN_UST
:
1640 /* Code flow error if we don't have a kernel session here. */
1642 assert(usess
->consumer
);
1643 consumer
= usess
->consumer
;
1647 for (i
= 0; i
< nb_uri
; i
++) {
1648 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1662 * Command LTTNG_CREATE_SESSION processed by the client thread.
1664 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1665 size_t nb_uri
, lttng_sock_cred
*creds
)
1669 struct ltt_session
*session
;
1673 /* No URIs is not possible. */
1675 ret
= LTTNG_ERR_SESSION_FAIL
;
1680 * Verify if the session already exist
1682 * XXX: There is no need for the session lock list here since the caller
1683 * (process_client_msg) is holding it. We might want to change that so a
1684 * single command does not lock the entire session list.
1686 session
= session_find_by_name(name
);
1687 if (session
!= NULL
) {
1688 ret
= LTTNG_ERR_EXIST_SESS
;
1692 /* Create tracing session in the registry */
1693 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
1694 LTTNG_SOCK_GET_GID_CRED(creds
));
1695 if (ret
!= LTTNG_OK
) {
1700 * Get the newly created session pointer back
1702 * XXX: There is no need for the session lock list here since the caller
1703 * (process_client_msg) is holding it. We might want to change that so a
1704 * single command does not lock the entire session list.
1706 session
= session_find_by_name(name
);
1709 /* Create default consumer output for the session not yet created. */
1710 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1711 if (session
->consumer
== NULL
) {
1712 ret
= LTTNG_ERR_FATAL
;
1713 goto consumer_error
;
1716 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1717 if (ret
!= LTTNG_OK
) {
1718 goto consumer_error
;
1721 session
->consumer
->enabled
= 1;
1726 session_destroy(session
);
1733 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1735 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1738 struct ltt_ust_session
*usess
;
1739 struct ltt_kernel_session
*ksess
;
1744 usess
= session
->ust_session
;
1745 ksess
= session
->kernel_session
;
1747 /* Clean kernel session teardown */
1748 kernel_destroy_session(ksess
);
1750 /* UST session teardown */
1752 /* Close any relayd session */
1753 consumer_output_send_destroy_relayd(usess
->consumer
);
1755 /* Destroy every UST application related to this session. */
1756 ret
= ust_app_destroy_trace_all(usess
);
1758 ERR("Error in ust_app_destroy_trace_all");
1761 /* Clean up the rest. */
1762 trace_ust_destroy_session(usess
);
1766 * Must notify the kernel thread here to update it's poll set in order to
1767 * remove the channel(s)' fd just destroyed.
1769 ret
= notify_thread_pipe(wpipe
);
1771 PERROR("write kernel poll pipe");
1774 ret
= session_destroy(session
);
1780 * Command LTTNG_CALIBRATE processed by the client thread.
1782 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1787 case LTTNG_DOMAIN_KERNEL
:
1789 struct lttng_kernel_calibrate kcalibrate
;
1791 kcalibrate
.type
= calibrate
->type
;
1792 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1794 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1799 case LTTNG_DOMAIN_UST
:
1801 struct lttng_ust_calibrate ucalibrate
;
1803 ucalibrate
.type
= calibrate
->type
;
1804 ret
= ust_app_calibrate_glb(&ucalibrate
);
1806 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1812 ret
= LTTNG_ERR_UND
;
1823 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1825 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1826 const char *sock_path
, struct consumer_data
*cdata
)
1829 struct consumer_socket
*socket
;
1836 case LTTNG_DOMAIN_KERNEL
:
1838 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1842 /* Can't register a consumer if there is already one */
1843 if (ksess
->consumer_fds_sent
!= 0) {
1844 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1848 sock
= lttcomm_connect_unix_sock(sock_path
);
1850 ret
= LTTNG_ERR_CONNECT_FAIL
;
1854 socket
= consumer_allocate_socket(sock
);
1855 if (socket
== NULL
) {
1858 PERROR("close register consumer");
1860 ret
= LTTNG_ERR_FATAL
;
1864 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1865 if (socket
->lock
== NULL
) {
1866 PERROR("zmalloc pthread mutex");
1867 ret
= LTTNG_ERR_FATAL
;
1870 pthread_mutex_init(socket
->lock
, NULL
);
1871 socket
->registered
= 1;
1874 consumer_add_socket(socket
, ksess
->consumer
);
1877 pthread_mutex_lock(&cdata
->pid_mutex
);
1879 pthread_mutex_unlock(&cdata
->pid_mutex
);
1884 /* TODO: Userspace tracing */
1885 ret
= LTTNG_ERR_UND
;
1896 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1898 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1899 struct lttng_domain
**domains
)
1904 if (session
->kernel_session
!= NULL
) {
1905 DBG3("Listing domains found kernel domain");
1909 if (session
->ust_session
!= NULL
) {
1910 DBG3("Listing domains found UST global domain");
1914 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1915 if (*domains
== NULL
) {
1916 ret
= LTTNG_ERR_FATAL
;
1920 if (session
->kernel_session
!= NULL
) {
1921 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1925 if (session
->ust_session
!= NULL
) {
1926 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1927 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
1934 /* Return negative value to differentiate return code */
1940 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1942 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1943 struct lttng_channel
**channels
)
1946 ssize_t nb_chan
= 0;
1949 case LTTNG_DOMAIN_KERNEL
:
1950 if (session
->kernel_session
!= NULL
) {
1951 nb_chan
= session
->kernel_session
->channel_count
;
1953 DBG3("Number of kernel channels %zd", nb_chan
);
1955 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1958 case LTTNG_DOMAIN_UST
:
1959 if (session
->ust_session
!= NULL
) {
1960 nb_chan
= lttng_ht_get_count(
1961 session
->ust_session
->domain_global
.channels
);
1963 DBG3("Number of UST global channels %zd", nb_chan
);
1965 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1970 ret
= LTTNG_ERR_UND
;
1975 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
1976 if (*channels
== NULL
) {
1977 ret
= LTTNG_ERR_FATAL
;
1981 list_lttng_channels(domain
, session
, *channels
);
1984 /* Ret value was set in the domain switch case */
1991 /* Return negative value to differentiate return code */
1996 * Command LTTNG_LIST_EVENTS processed by the client thread.
1998 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
1999 char *channel_name
, struct lttng_event
**events
)
2002 ssize_t nb_event
= 0;
2005 case LTTNG_DOMAIN_KERNEL
:
2006 if (session
->kernel_session
!= NULL
) {
2007 nb_event
= list_lttng_kernel_events(channel_name
,
2008 session
->kernel_session
, events
);
2011 case LTTNG_DOMAIN_UST
:
2013 if (session
->ust_session
!= NULL
) {
2014 nb_event
= list_lttng_ust_global_events(channel_name
,
2015 &session
->ust_session
->domain_global
, events
);
2020 ret
= LTTNG_ERR_UND
;
2027 /* Return negative value to differentiate return code */
2032 * Using the session list, filled a lttng_session array to send back to the
2033 * client for session listing.
2035 * The session list lock MUST be acquired before calling this function. Use
2036 * session_lock_list() and session_unlock_list().
2038 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2043 struct ltt_session
*session
;
2044 struct ltt_session_list
*list
= session_get_list();
2046 DBG("Getting all available session for UID %d GID %d",
2049 * Iterate over session list and append data after the control struct in
2052 cds_list_for_each_entry(session
, &list
->head
, list
) {
2054 * Only list the sessions the user can control.
2056 if (!session_access_ok(session
, uid
, gid
)) {
2060 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2061 struct ltt_ust_session
*usess
= session
->ust_session
;
2063 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2064 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2065 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2066 ret
= build_network_session_path(sessions
[i
].path
,
2067 sizeof(session
[i
].path
), session
);
2069 ret
= snprintf(sessions
[i
].path
, sizeof(session
[i
].path
), "%s",
2070 session
->consumer
->dst
.trace_path
);
2073 PERROR("snprintf session path");
2077 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2078 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2079 sessions
[i
].enabled
= session
->enabled
;
2085 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2086 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2088 int cmd_data_pending(struct ltt_session
*session
)
2091 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2092 struct ltt_ust_session
*usess
= session
->ust_session
;
2096 /* Session MUST be stopped to ask for data availability. */
2097 if (session
->enabled
) {
2098 ret
= LTTNG_ERR_SESSION_STARTED
;
2102 if (ksess
&& ksess
->consumer
) {
2103 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2105 /* Data is still being extracted for the kernel. */
2110 if (usess
&& usess
->consumer
) {
2111 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2113 /* Data is still being extracted for the kernel. */
2118 /* Data is ready to be read by a viewer */
2126 * Init command subsystem.
2131 * Set network sequence index to 1 for streams to match a relayd
2132 * socket on the consumer side.
2134 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
2135 relayd_net_seq_idx
= 1;
2136 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
2138 DBG("Command subsystem initialized");