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 * The consumer output for this session should not be used anymore
610 * since the relayd connection failed thus making any tracing or/and
611 * streaming not usable.
613 consumer
->enabled
= 0;
619 * Send both relayd sockets to a specific consumer and domain. This is a
620 * helper function to facilitate sending the information to the consumer for a
623 static int send_consumer_relayd_sockets(int domain
,
624 struct ltt_session
*session
, struct consumer_output
*consumer
,
625 struct consumer_socket
*sock
)
632 /* Sending control relayd socket. */
633 if (!sock
->control_sock_sent
) {
634 ret
= send_consumer_relayd_socket(domain
, session
,
635 &consumer
->dst
.net
.control
, consumer
, sock
);
636 if (ret
!= LTTNG_OK
) {
641 /* Sending data relayd socket. */
642 if (!sock
->data_sock_sent
) {
643 ret
= send_consumer_relayd_socket(domain
, session
,
644 &consumer
->dst
.net
.data
, consumer
, sock
);
645 if (ret
!= LTTNG_OK
) {
655 * Setup relayd connections for a tracing session. First creates the socket to
656 * the relayd and send them to the right domain consumer. Consumer type MUST be
659 int cmd_setup_relayd(struct ltt_session
*session
)
662 struct ltt_ust_session
*usess
;
663 struct ltt_kernel_session
*ksess
;
664 struct consumer_socket
*socket
;
665 struct lttng_ht_iter iter
;
669 usess
= session
->ust_session
;
670 ksess
= session
->kernel_session
;
672 DBG("Setting relayd for session %s", session
->name
);
676 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
677 && usess
->consumer
->enabled
) {
678 /* For each consumer socket, send relayd sockets */
679 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
681 /* Code flow error */
682 assert(socket
->fd
>= 0);
684 pthread_mutex_lock(socket
->lock
);
685 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
,
686 usess
->consumer
, socket
);
687 pthread_mutex_unlock(socket
->lock
);
688 if (ret
!= LTTNG_OK
) {
694 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
695 && ksess
->consumer
->enabled
) {
696 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
698 /* Code flow error */
699 assert(socket
->fd
>= 0);
701 pthread_mutex_lock(socket
->lock
);
702 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
,
703 ksess
->consumer
, socket
);
704 pthread_mutex_unlock(socket
->lock
);
705 if (ret
!= LTTNG_OK
) {
717 * Start a kernel session by opening all necessary streams.
719 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
722 struct ltt_kernel_channel
*kchan
;
724 /* Open kernel metadata */
725 if (ksess
->metadata
== NULL
) {
726 ret
= kernel_open_metadata(ksess
);
728 ret
= LTTNG_ERR_KERN_META_FAIL
;
733 /* Open kernel metadata stream */
734 if (ksess
->metadata_stream_fd
< 0) {
735 ret
= kernel_open_metadata_stream(ksess
);
737 ERR("Kernel create metadata stream failed");
738 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
743 /* For each channel */
744 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
745 if (kchan
->stream_count
== 0) {
746 ret
= kernel_open_channel_stream(kchan
);
748 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
751 /* Update the stream global counter */
752 ksess
->stream_count_global
+= ret
;
756 /* Setup kernel consumer socket and send fds to it */
757 ret
= init_kernel_tracing(ksess
);
759 ret
= LTTNG_ERR_KERN_START_FAIL
;
763 /* This start the kernel tracing */
764 ret
= kernel_start_session(ksess
);
766 ret
= LTTNG_ERR_KERN_START_FAIL
;
770 /* Quiescent wait after starting trace */
771 kernel_wait_quiescent(kernel_tracer_fd
);
782 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
784 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
788 struct ltt_ust_session
*usess
;
790 usess
= session
->ust_session
;
795 case LTTNG_DOMAIN_KERNEL
:
797 ret
= channel_kernel_disable(session
->kernel_session
,
799 if (ret
!= LTTNG_OK
) {
803 kernel_wait_quiescent(kernel_tracer_fd
);
806 case LTTNG_DOMAIN_UST
:
808 struct ltt_ust_channel
*uchan
;
809 struct lttng_ht
*chan_ht
;
811 chan_ht
= usess
->domain_global
.channels
;
813 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
815 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
819 ret
= channel_ust_disable(usess
, uchan
);
820 if (ret
!= LTTNG_OK
) {
826 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
827 case LTTNG_DOMAIN_UST_EXEC_NAME
:
828 case LTTNG_DOMAIN_UST_PID
:
831 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
843 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
845 * The wpipe arguments is used as a notifier for the kernel thread.
847 int cmd_enable_channel(struct ltt_session
*session
,
848 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
851 struct ltt_ust_session
*usess
= session
->ust_session
;
852 struct lttng_ht
*chan_ht
;
858 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
862 switch (domain
->type
) {
863 case LTTNG_DOMAIN_KERNEL
:
865 struct ltt_kernel_channel
*kchan
;
867 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
868 session
->kernel_session
);
871 * Don't try to create a channel if the session
872 * has been started at some point in time
873 * before. The tracer does not allow it.
875 if (session
->started
) {
876 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
879 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
881 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
884 if (ret
!= LTTNG_OK
) {
888 kernel_wait_quiescent(kernel_tracer_fd
);
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
);
900 * Don't try to create a channel if the session
901 * has been started at some point in time
902 * before. The tracer does not allow it.
904 if (session
->started
) {
905 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
908 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
910 ret
= channel_ust_enable(usess
, uchan
);
915 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
926 * Command LTTNG_DISABLE_EVENT processed by the client thread.
928 int cmd_disable_event(struct ltt_session
*session
, int domain
,
929 char *channel_name
, char *event_name
)
936 case LTTNG_DOMAIN_KERNEL
:
938 struct ltt_kernel_channel
*kchan
;
939 struct ltt_kernel_session
*ksess
;
941 ksess
= session
->kernel_session
;
943 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
945 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
949 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
950 if (ret
!= LTTNG_OK
) {
954 kernel_wait_quiescent(kernel_tracer_fd
);
957 case LTTNG_DOMAIN_UST
:
959 struct ltt_ust_channel
*uchan
;
960 struct ltt_ust_session
*usess
;
962 usess
= session
->ust_session
;
964 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
967 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
971 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
972 if (ret
!= LTTNG_OK
) {
976 DBG3("Disable UST event %s in channel %s completed", event_name
,
981 case LTTNG_DOMAIN_UST_EXEC_NAME
:
982 case LTTNG_DOMAIN_UST_PID
:
983 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
998 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1000 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
1008 case LTTNG_DOMAIN_KERNEL
:
1010 struct ltt_kernel_session
*ksess
;
1011 struct ltt_kernel_channel
*kchan
;
1013 ksess
= session
->kernel_session
;
1015 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1016 if (kchan
== NULL
) {
1017 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1021 ret
= event_kernel_disable_all(kchan
);
1022 if (ret
!= LTTNG_OK
) {
1026 kernel_wait_quiescent(kernel_tracer_fd
);
1029 case LTTNG_DOMAIN_UST
:
1031 struct ltt_ust_session
*usess
;
1032 struct ltt_ust_channel
*uchan
;
1034 usess
= session
->ust_session
;
1036 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1038 if (uchan
== NULL
) {
1039 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1043 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1048 DBG3("Disable all UST events in channel %s completed", channel_name
);
1053 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1054 case LTTNG_DOMAIN_UST_PID
:
1055 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1058 ret
= LTTNG_ERR_UND
;
1070 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1072 int cmd_add_context(struct ltt_session
*session
, int domain
,
1073 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1075 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1078 case LTTNG_DOMAIN_KERNEL
:
1079 assert(session
->kernel_session
);
1081 if (session
->kernel_session
->channel_count
== 0) {
1082 /* Create default channel */
1083 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1084 if (ret
!= LTTNG_OK
) {
1087 chan_kern_created
= 1;
1090 /* Add kernel context to kernel tracer */
1091 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1092 if (ret
!= LTTNG_OK
) {
1096 case LTTNG_DOMAIN_UST
:
1098 struct ltt_ust_session
*usess
= session
->ust_session
;
1101 unsigned int chan_count
=
1102 lttng_ht_get_count(usess
->domain_global
.channels
);
1103 if (chan_count
== 0) {
1104 struct lttng_channel
*attr
;
1105 /* Create default channel */
1106 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1108 ret
= LTTNG_ERR_FATAL
;
1112 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1113 if (ret
!= LTTNG_OK
) {
1118 chan_ust_created
= 1;
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
;
1140 if (chan_kern_created
) {
1141 struct ltt_kernel_channel
*kchan
=
1142 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1143 session
->kernel_session
);
1144 /* Created previously, this should NOT fail. */
1146 kernel_destroy_channel(kchan
);
1149 if (chan_ust_created
) {
1150 struct ltt_ust_channel
*uchan
=
1151 trace_ust_find_channel_by_name(
1152 session
->ust_session
->domain_global
.channels
,
1153 DEFAULT_CHANNEL_NAME
);
1154 /* Created previously, this should NOT fail. */
1156 /* Remove from the channel list of the session. */
1157 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1159 trace_ust_destroy_channel(uchan
);
1165 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1167 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1168 char *channel_name
, struct lttng_event
*event
,
1169 struct lttng_filter_bytecode
*filter
, int wpipe
)
1171 int ret
, channel_created
= 0;
1172 struct lttng_channel
*attr
;
1176 assert(channel_name
);
1180 switch (domain
->type
) {
1181 case LTTNG_DOMAIN_KERNEL
:
1183 struct ltt_kernel_channel
*kchan
;
1185 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1186 session
->kernel_session
);
1187 if (kchan
== NULL
) {
1188 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1189 LTTNG_BUFFER_GLOBAL
);
1191 ret
= LTTNG_ERR_FATAL
;
1194 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1196 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1197 if (ret
!= LTTNG_OK
) {
1203 channel_created
= 1;
1206 /* Get the newly created kernel channel pointer */
1207 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1208 session
->kernel_session
);
1209 if (kchan
== NULL
) {
1210 /* This sould not happen... */
1211 ret
= LTTNG_ERR_FATAL
;
1215 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1216 if (ret
!= LTTNG_OK
) {
1217 if (channel_created
) {
1218 /* Let's not leak a useless channel. */
1219 kernel_destroy_channel(kchan
);
1224 kernel_wait_quiescent(kernel_tracer_fd
);
1227 case LTTNG_DOMAIN_UST
:
1229 struct ltt_ust_channel
*uchan
;
1230 struct ltt_ust_session
*usess
= session
->ust_session
;
1234 /* Get channel from global UST domain */
1235 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1237 if (uchan
== NULL
) {
1238 /* Create default channel */
1239 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1240 usess
->buffer_type
);
1242 ret
= LTTNG_ERR_FATAL
;
1245 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1247 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1248 if (ret
!= LTTNG_OK
) {
1254 /* Get the newly created channel reference back */
1255 uchan
= trace_ust_find_channel_by_name(
1256 usess
->domain_global
.channels
, channel_name
);
1260 /* At this point, the session and channel exist on the tracer */
1261 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
, filter
);
1262 if (ret
!= LTTNG_OK
) {
1268 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1269 case LTTNG_DOMAIN_UST_PID
:
1270 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1273 ret
= LTTNG_ERR_UND
;
1285 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1287 int cmd_enable_event_all(struct ltt_session
*session
,
1288 struct lttng_domain
*domain
, char *channel_name
, int event_type
,
1289 struct lttng_filter_bytecode
*filter
, int wpipe
)
1292 struct lttng_channel
*attr
;
1295 assert(channel_name
);
1299 switch (domain
->type
) {
1300 case LTTNG_DOMAIN_KERNEL
:
1302 struct ltt_kernel_channel
*kchan
;
1304 assert(session
->kernel_session
);
1306 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1307 session
->kernel_session
);
1308 if (kchan
== NULL
) {
1309 /* Create default channel */
1310 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1311 LTTNG_BUFFER_GLOBAL
);
1313 ret
= LTTNG_ERR_FATAL
;
1316 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1318 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1319 if (ret
!= LTTNG_OK
) {
1325 /* Get the newly created kernel channel pointer */
1326 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1327 session
->kernel_session
);
1331 switch (event_type
) {
1332 case LTTNG_EVENT_SYSCALL
:
1333 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1335 case LTTNG_EVENT_TRACEPOINT
:
1337 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1338 * events already registered to the channel.
1340 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1342 case LTTNG_EVENT_ALL
:
1343 /* Enable syscalls and tracepoints */
1344 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1347 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1351 /* Manage return value */
1352 if (ret
!= LTTNG_OK
) {
1354 * On error, cmd_enable_channel call will take care of destroying
1355 * the created channel if it was needed.
1360 kernel_wait_quiescent(kernel_tracer_fd
);
1363 case LTTNG_DOMAIN_UST
:
1365 struct ltt_ust_channel
*uchan
;
1366 struct ltt_ust_session
*usess
= session
->ust_session
;
1370 /* Get channel from global UST domain */
1371 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1373 if (uchan
== NULL
) {
1374 /* Create default channel */
1375 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1376 usess
->buffer_type
);
1378 ret
= LTTNG_ERR_FATAL
;
1381 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1383 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1384 if (ret
!= LTTNG_OK
) {
1390 /* Get the newly created channel reference back */
1391 uchan
= trace_ust_find_channel_by_name(
1392 usess
->domain_global
.channels
, channel_name
);
1396 /* At this point, the session and channel exist on the tracer */
1398 switch (event_type
) {
1399 case LTTNG_EVENT_ALL
:
1400 case LTTNG_EVENT_TRACEPOINT
:
1401 ret
= event_ust_enable_all_tracepoints(usess
, uchan
, filter
);
1402 if (ret
!= LTTNG_OK
) {
1407 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1411 /* Manage return value */
1412 if (ret
!= LTTNG_OK
) {
1419 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1420 case LTTNG_DOMAIN_UST_PID
:
1421 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1424 ret
= LTTNG_ERR_UND
;
1437 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1439 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1442 ssize_t nb_events
= 0;
1445 case LTTNG_DOMAIN_KERNEL
:
1446 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1447 if (nb_events
< 0) {
1448 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1452 case LTTNG_DOMAIN_UST
:
1453 nb_events
= ust_app_list_events(events
);
1454 if (nb_events
< 0) {
1455 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1460 ret
= LTTNG_ERR_UND
;
1467 /* Return negative value to differentiate return code */
1472 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1474 ssize_t
cmd_list_tracepoint_fields(int domain
,
1475 struct lttng_event_field
**fields
)
1478 ssize_t nb_fields
= 0;
1481 case LTTNG_DOMAIN_UST
:
1482 nb_fields
= ust_app_list_event_fields(fields
);
1483 if (nb_fields
< 0) {
1484 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1488 case LTTNG_DOMAIN_KERNEL
:
1489 default: /* fall-through */
1490 ret
= LTTNG_ERR_UND
;
1497 /* Return negative value to differentiate return code */
1502 * Command LTTNG_START_TRACE processed by the client thread.
1504 int cmd_start_trace(struct ltt_session
*session
)
1507 struct ltt_kernel_session
*ksession
;
1508 struct ltt_ust_session
*usess
;
1512 /* Ease our life a bit ;) */
1513 ksession
= session
->kernel_session
;
1514 usess
= session
->ust_session
;
1516 if (session
->enabled
) {
1517 /* Already started. */
1518 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1522 session
->enabled
= 1;
1524 /* Kernel tracing */
1525 if (ksession
!= NULL
) {
1526 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1527 if (ret
!= LTTNG_OK
) {
1532 /* Flag session that trace should start automatically */
1534 usess
->start_trace
= 1;
1536 ret
= ust_app_start_trace_all(usess
);
1538 ret
= LTTNG_ERR_UST_START_FAIL
;
1543 session
->started
= 1;
1552 * Command LTTNG_STOP_TRACE processed by the client thread.
1554 int cmd_stop_trace(struct ltt_session
*session
)
1557 struct ltt_kernel_channel
*kchan
;
1558 struct ltt_kernel_session
*ksession
;
1559 struct ltt_ust_session
*usess
;
1564 ksession
= session
->kernel_session
;
1565 usess
= session
->ust_session
;
1567 if (!session
->enabled
) {
1568 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1572 session
->enabled
= 0;
1575 if (ksession
&& ksession
->started
) {
1576 DBG("Stop kernel tracing");
1578 /* Flush metadata if exist */
1579 if (ksession
->metadata_stream_fd
>= 0) {
1580 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1582 ERR("Kernel metadata flush failed");
1586 /* Flush all buffers before stopping */
1587 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1588 ret
= kernel_flush_buffer(kchan
);
1590 ERR("Kernel flush buffer error");
1594 ret
= kernel_stop_session(ksession
);
1596 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1600 kernel_wait_quiescent(kernel_tracer_fd
);
1602 ksession
->started
= 0;
1605 if (usess
&& usess
->start_trace
) {
1606 usess
->start_trace
= 0;
1608 ret
= ust_app_stop_trace_all(usess
);
1610 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1622 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1624 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1625 size_t nb_uri
, struct lttng_uri
*uris
)
1628 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1629 struct ltt_ust_session
*usess
= session
->ust_session
;
1630 struct consumer_output
*consumer
= NULL
;
1636 /* Can't enable consumer after session started. */
1637 if (session
->enabled
) {
1638 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1643 * This case switch makes sure the domain session has a temporary consumer
1644 * so the URL can be set.
1648 /* Code flow error. A session MUST always have a consumer object */
1649 assert(session
->consumer
);
1651 * The URL will be added to the tracing session consumer instead of a
1652 * specific domain consumer.
1654 consumer
= session
->consumer
;
1656 case LTTNG_DOMAIN_KERNEL
:
1657 /* Code flow error if we don't have a kernel session here. */
1659 assert(ksess
->consumer
);
1660 consumer
= ksess
->consumer
;
1662 case LTTNG_DOMAIN_UST
:
1663 /* Code flow error if we don't have a kernel session here. */
1665 assert(usess
->consumer
);
1666 consumer
= usess
->consumer
;
1670 for (i
= 0; i
< nb_uri
; i
++) {
1671 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1672 if (ret
!= LTTNG_OK
) {
1685 * Command LTTNG_CREATE_SESSION processed by the client thread.
1687 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1688 size_t nb_uri
, lttng_sock_cred
*creds
)
1691 struct ltt_session
*session
;
1695 /* No URIs is not possible. */
1697 ret
= LTTNG_ERR_SESSION_FAIL
;
1702 * Verify if the session already exist
1704 * XXX: There is no need for the session lock list here since the caller
1705 * (process_client_msg) is holding it. We might want to change that so a
1706 * single command does not lock the entire session list.
1708 session
= session_find_by_name(name
);
1709 if (session
!= NULL
) {
1710 ret
= LTTNG_ERR_EXIST_SESS
;
1714 /* Create tracing session in the registry */
1715 ret
= session_create(name
, LTTNG_SOCK_GET_UID_CRED(creds
),
1716 LTTNG_SOCK_GET_GID_CRED(creds
));
1717 if (ret
!= LTTNG_OK
) {
1722 * Get the newly created session pointer back
1724 * XXX: There is no need for the session lock list here since the caller
1725 * (process_client_msg) is holding it. We might want to change that so a
1726 * single command does not lock the entire session list.
1728 session
= session_find_by_name(name
);
1731 /* Create default consumer output for the session not yet created. */
1732 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1733 if (session
->consumer
== NULL
) {
1734 ret
= LTTNG_ERR_FATAL
;
1735 goto consumer_error
;
1738 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1739 if (ret
!= LTTNG_OK
) {
1740 goto consumer_error
;
1743 session
->consumer
->enabled
= 1;
1748 session_destroy(session
);
1755 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1757 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1760 struct ltt_ust_session
*usess
;
1761 struct ltt_kernel_session
*ksess
;
1766 usess
= session
->ust_session
;
1767 ksess
= session
->kernel_session
;
1769 /* Clean kernel session teardown */
1770 kernel_destroy_session(ksess
);
1772 /* UST session teardown */
1774 /* Close any relayd session */
1775 consumer_output_send_destroy_relayd(usess
->consumer
);
1777 /* Destroy every UST application related to this session. */
1778 ret
= ust_app_destroy_trace_all(usess
);
1780 ERR("Error in ust_app_destroy_trace_all");
1783 /* Clean up the rest. */
1784 trace_ust_destroy_session(usess
);
1788 * Must notify the kernel thread here to update it's poll set in order to
1789 * remove the channel(s)' fd just destroyed.
1791 ret
= notify_thread_pipe(wpipe
);
1793 PERROR("write kernel poll pipe");
1796 ret
= session_destroy(session
);
1802 * Command LTTNG_CALIBRATE processed by the client thread.
1804 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1809 case LTTNG_DOMAIN_KERNEL
:
1811 struct lttng_kernel_calibrate kcalibrate
;
1813 switch (calibrate
->type
) {
1814 case LTTNG_CALIBRATE_FUNCTION
:
1816 /* Default and only possible calibrate option. */
1817 kcalibrate
.type
= LTTNG_KERNEL_CALIBRATE_KRETPROBE
;
1821 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1823 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1828 case LTTNG_DOMAIN_UST
:
1830 struct lttng_ust_calibrate ucalibrate
;
1832 switch (calibrate
->type
) {
1833 case LTTNG_CALIBRATE_FUNCTION
:
1835 /* Default and only possible calibrate option. */
1836 ucalibrate
.type
= LTTNG_UST_CALIBRATE_TRACEPOINT
;
1840 ret
= ust_app_calibrate_glb(&ucalibrate
);
1842 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1848 ret
= LTTNG_ERR_UND
;
1859 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1861 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1862 const char *sock_path
, struct consumer_data
*cdata
)
1865 struct consumer_socket
*socket
= NULL
;
1872 case LTTNG_DOMAIN_KERNEL
:
1874 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1878 /* Can't register a consumer if there is already one */
1879 if (ksess
->consumer_fds_sent
!= 0) {
1880 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1884 sock
= lttcomm_connect_unix_sock(sock_path
);
1886 ret
= LTTNG_ERR_CONNECT_FAIL
;
1890 socket
= consumer_allocate_socket(sock
);
1891 if (socket
== NULL
) {
1894 PERROR("close register consumer");
1896 ret
= LTTNG_ERR_FATAL
;
1900 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1901 if (socket
->lock
== NULL
) {
1902 PERROR("zmalloc pthread mutex");
1903 ret
= LTTNG_ERR_FATAL
;
1906 pthread_mutex_init(socket
->lock
, NULL
);
1907 socket
->registered
= 1;
1910 consumer_add_socket(socket
, ksess
->consumer
);
1913 pthread_mutex_lock(&cdata
->pid_mutex
);
1915 pthread_mutex_unlock(&cdata
->pid_mutex
);
1920 /* TODO: Userspace tracing */
1921 ret
= LTTNG_ERR_UND
;
1929 consumer_destroy_socket(socket
);
1935 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1937 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1938 struct lttng_domain
**domains
)
1943 if (session
->kernel_session
!= NULL
) {
1944 DBG3("Listing domains found kernel domain");
1948 if (session
->ust_session
!= NULL
) {
1949 DBG3("Listing domains found UST global domain");
1953 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1954 if (*domains
== NULL
) {
1955 ret
= LTTNG_ERR_FATAL
;
1959 if (session
->kernel_session
!= NULL
) {
1960 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1964 if (session
->ust_session
!= NULL
) {
1965 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1966 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
1973 /* Return negative value to differentiate return code */
1979 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1981 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1982 struct lttng_channel
**channels
)
1985 ssize_t nb_chan
= 0;
1988 case LTTNG_DOMAIN_KERNEL
:
1989 if (session
->kernel_session
!= NULL
) {
1990 nb_chan
= session
->kernel_session
->channel_count
;
1992 DBG3("Number of kernel channels %zd", nb_chan
);
1994 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1997 case LTTNG_DOMAIN_UST
:
1998 if (session
->ust_session
!= NULL
) {
1999 nb_chan
= lttng_ht_get_count(
2000 session
->ust_session
->domain_global
.channels
);
2002 DBG3("Number of UST global channels %zd", nb_chan
);
2004 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2009 ret
= LTTNG_ERR_UND
;
2014 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2015 if (*channels
== NULL
) {
2016 ret
= LTTNG_ERR_FATAL
;
2020 list_lttng_channels(domain
, session
, *channels
);
2023 /* Ret value was set in the domain switch case */
2030 /* Return negative value to differentiate return code */
2035 * Command LTTNG_LIST_EVENTS processed by the client thread.
2037 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2038 char *channel_name
, struct lttng_event
**events
)
2041 ssize_t nb_event
= 0;
2044 case LTTNG_DOMAIN_KERNEL
:
2045 if (session
->kernel_session
!= NULL
) {
2046 nb_event
= list_lttng_kernel_events(channel_name
,
2047 session
->kernel_session
, events
);
2050 case LTTNG_DOMAIN_UST
:
2052 if (session
->ust_session
!= NULL
) {
2053 nb_event
= list_lttng_ust_global_events(channel_name
,
2054 &session
->ust_session
->domain_global
, events
);
2059 ret
= LTTNG_ERR_UND
;
2066 /* Return negative value to differentiate return code */
2071 * Using the session list, filled a lttng_session array to send back to the
2072 * client for session listing.
2074 * The session list lock MUST be acquired before calling this function. Use
2075 * session_lock_list() and session_unlock_list().
2077 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2082 struct ltt_session
*session
;
2083 struct ltt_session_list
*list
= session_get_list();
2085 DBG("Getting all available session for UID %d GID %d",
2088 * Iterate over session list and append data after the control struct in
2091 cds_list_for_each_entry(session
, &list
->head
, list
) {
2093 * Only list the sessions the user can control.
2095 if (!session_access_ok(session
, uid
, gid
)) {
2099 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2100 struct ltt_ust_session
*usess
= session
->ust_session
;
2102 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2103 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2104 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2105 ret
= build_network_session_path(sessions
[i
].path
,
2106 sizeof(sessions
[i
].path
), session
);
2108 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
2109 session
->consumer
->dst
.trace_path
);
2112 PERROR("snprintf session path");
2116 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2117 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2118 sessions
[i
].enabled
= session
->enabled
;
2124 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2125 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2127 int cmd_data_pending(struct ltt_session
*session
)
2130 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2131 struct ltt_ust_session
*usess
= session
->ust_session
;
2135 /* Session MUST be stopped to ask for data availability. */
2136 if (session
->enabled
) {
2137 ret
= LTTNG_ERR_SESSION_STARTED
;
2141 if (ksess
&& ksess
->consumer
) {
2142 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2144 /* Data is still being extracted for the kernel. */
2149 if (usess
&& usess
->consumer
) {
2150 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2152 /* Data is still being extracted for the kernel. */
2157 /* Data is ready to be read by a viewer */
2165 * Init command subsystem.
2170 * Set network sequence index to 1 for streams to match a relayd
2171 * socket on the consumer side.
2173 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
2174 relayd_net_seq_idx
= 1;
2175 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
2177 DBG("Command subsystem initialized");