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.
21 #include <urcu/list.h>
22 #include <urcu/uatomic.h>
24 #include <common/defaults.h>
25 #include <common/common.h>
26 #include <common/sessiond-comm/sessiond-comm.h>
27 #include <common/relayd/relayd.h>
34 #include "kernel-consumer.h"
35 #include "lttng-sessiond.h"
41 * Used to keep a unique index for each relayd socket created where this value
42 * is associated with streams on the consumer so it can match the right relayd
43 * to send to. It must be accessed with the relayd_net_seq_idx_lock
46 static pthread_mutex_t relayd_net_seq_idx_lock
= PTHREAD_MUTEX_INITIALIZER
;
47 static uint64_t relayd_net_seq_idx
;
50 * Create a session path used by list_lttng_sessions for the case that the
51 * session consumer is on the network.
53 static int build_network_session_path(char *dst
, size_t size
,
54 struct ltt_session
*session
)
56 int ret
, kdata_port
, udata_port
;
57 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
58 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
63 memset(tmp_urls
, 0, sizeof(tmp_urls
));
64 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
66 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
68 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
69 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
70 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
73 if (session
->ust_session
&& session
->ust_session
->consumer
) {
74 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
75 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
78 if (uuri
== NULL
&& kuri
== NULL
) {
79 uri
= &session
->consumer
->dst
.net
.control
;
80 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
81 } else if (kuri
&& uuri
) {
82 ret
= uri_compare(kuri
, uuri
);
86 /* Build uuri URL string */
87 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
94 } else if (kuri
&& uuri
== NULL
) {
96 } else if (uuri
&& kuri
== NULL
) {
100 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
106 * Do we have a UST url set. If yes, this means we have both kernel and UST
109 if (*tmp_uurl
!= '\0') {
110 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
111 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
114 if (kuri
|| (!kuri
&& !uuri
)) {
117 /* No kernel URI, use the UST port. */
120 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, dport
);
128 * Fill lttng_channel array of all channels.
130 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
131 struct lttng_channel
*channels
)
134 struct ltt_kernel_channel
*kchan
;
136 DBG("Listing channels for session %s", session
->name
);
139 case LTTNG_DOMAIN_KERNEL
:
140 /* Kernel channels */
141 if (session
->kernel_session
!= NULL
) {
142 cds_list_for_each_entry(kchan
,
143 &session
->kernel_session
->channel_list
.head
, list
) {
144 /* Copy lttng_channel struct to array */
145 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
146 channels
[i
].enabled
= kchan
->enabled
;
151 case LTTNG_DOMAIN_UST
:
153 struct lttng_ht_iter iter
;
154 struct ltt_ust_channel
*uchan
;
157 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
158 &iter
.iter
, uchan
, node
.node
) {
159 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
160 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
161 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
162 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
163 channels
[i
].attr
.switch_timer_interval
=
164 uchan
->attr
.switch_timer_interval
;
165 channels
[i
].attr
.read_timer_interval
=
166 uchan
->attr
.read_timer_interval
;
167 channels
[i
].enabled
= uchan
->enabled
;
168 switch (uchan
->attr
.output
) {
171 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
185 * Create a list of ust global domain events.
187 static int list_lttng_ust_global_events(char *channel_name
,
188 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
191 unsigned int nb_event
= 0;
192 struct lttng_ht_iter iter
;
193 struct lttng_ht_node_str
*node
;
194 struct ltt_ust_channel
*uchan
;
195 struct ltt_ust_event
*uevent
;
196 struct lttng_event
*tmp
;
198 DBG("Listing UST global events for channel %s", channel_name
);
202 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
203 node
= lttng_ht_iter_get_node_str(&iter
);
205 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
209 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
211 nb_event
+= lttng_ht_get_count(uchan
->events
);
218 DBG3("Listing UST global %d events", nb_event
);
220 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
222 ret
= LTTNG_ERR_FATAL
;
226 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
227 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
228 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
229 tmp
[i
].enabled
= uevent
->enabled
;
231 switch (uevent
->attr
.instrumentation
) {
232 case LTTNG_UST_TRACEPOINT
:
233 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
235 case LTTNG_UST_PROBE
:
236 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
238 case LTTNG_UST_FUNCTION
:
239 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
243 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
244 switch (uevent
->attr
.loglevel_type
) {
245 case LTTNG_UST_LOGLEVEL_ALL
:
246 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
248 case LTTNG_UST_LOGLEVEL_RANGE
:
249 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
251 case LTTNG_UST_LOGLEVEL_SINGLE
:
252 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
255 if (uevent
->filter
) {
270 * Fill lttng_event array of all kernel events in the channel.
272 static int list_lttng_kernel_events(char *channel_name
,
273 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
276 unsigned int nb_event
;
277 struct ltt_kernel_event
*event
;
278 struct ltt_kernel_channel
*kchan
;
280 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
282 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
286 nb_event
= kchan
->event_count
;
288 DBG("Listing events for channel %s", kchan
->channel
->name
);
294 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
295 if (*events
== NULL
) {
296 ret
= LTTNG_ERR_FATAL
;
300 /* Kernel channels */
301 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
302 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
303 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
304 (*events
)[i
].enabled
= event
->enabled
;
306 switch (event
->event
->instrumentation
) {
307 case LTTNG_KERNEL_TRACEPOINT
:
308 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
310 case LTTNG_KERNEL_KRETPROBE
:
311 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
312 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
313 sizeof(struct lttng_kernel_kprobe
));
315 case LTTNG_KERNEL_KPROBE
:
316 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
317 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
318 sizeof(struct lttng_kernel_kprobe
));
320 case LTTNG_KERNEL_FUNCTION
:
321 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
322 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
323 sizeof(struct lttng_kernel_function
));
325 case LTTNG_KERNEL_NOOP
:
326 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
328 case LTTNG_KERNEL_SYSCALL
:
329 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
331 case LTTNG_KERNEL_ALL
:
342 /* Negate the error code to differentiate the size from an error */
347 * Add URI so the consumer output object. Set the correct path depending on the
348 * domain adding the default trace directory.
350 static int add_uri_to_consumer(struct consumer_output
*consumer
,
351 struct lttng_uri
*uri
, int domain
, const char *session_name
)
354 const char *default_trace_dir
;
358 if (consumer
== NULL
) {
359 DBG("No consumer detected. Don't add URI. Stopping.");
360 ret
= LTTNG_ERR_NO_CONSUMER
;
365 case LTTNG_DOMAIN_KERNEL
:
366 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
368 case LTTNG_DOMAIN_UST
:
369 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
373 * This case is possible is we try to add the URI to the global tracing
374 * session consumer object which in this case there is no subdir.
376 default_trace_dir
= "";
379 switch (uri
->dtype
) {
382 DBG2("Setting network URI to consumer");
384 if (consumer
->type
== CONSUMER_DST_NET
) {
385 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
386 consumer
->dst
.net
.control_isset
) ||
387 (uri
->stype
== LTTNG_STREAM_DATA
&&
388 consumer
->dst
.net
.data_isset
)) {
389 ret
= LTTNG_ERR_URL_EXIST
;
393 memset(&consumer
->dst
.net
, 0, sizeof(consumer
->dst
.net
));
396 consumer
->type
= CONSUMER_DST_NET
;
398 /* Set URI into consumer output object */
399 ret
= consumer_set_network_uri(consumer
, uri
);
403 } else if (ret
== 1) {
405 * URI was the same in the consumer so we do not append the subdir
406 * again so to not duplicate output dir.
411 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
412 ret
= consumer_set_subdir(consumer
, session_name
);
414 ret
= LTTNG_ERR_FATAL
;
419 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
420 /* On a new subdir, reappend the default trace dir. */
421 strncat(consumer
->subdir
, default_trace_dir
,
422 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
423 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
428 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
429 memset(consumer
->dst
.trace_path
, 0,
430 sizeof(consumer
->dst
.trace_path
));
431 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
432 sizeof(consumer
->dst
.trace_path
));
433 /* Append default trace dir */
434 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
435 sizeof(consumer
->dst
.trace_path
) -
436 strlen(consumer
->dst
.trace_path
) - 1);
437 /* Flag consumer as local. */
438 consumer
->type
= CONSUMER_DST_LOCAL
;
449 * Init tracing by creating trace directory and sending fds kernel consumer.
451 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
454 struct lttng_ht_iter iter
;
455 struct consumer_socket
*socket
;
461 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
462 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
464 /* Code flow error */
465 assert(socket
->fd
>= 0);
467 pthread_mutex_lock(socket
->lock
);
468 ret
= kernel_consumer_send_session(socket
, session
);
469 pthread_mutex_unlock(socket
->lock
);
471 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
483 * Create a socket to the relayd using the URI.
485 * On success, the relayd_sock pointer is set to the created socket.
486 * Else, it's stays untouched and a lttcomm error code is returned.
488 static int create_connect_relayd(struct lttng_uri
*uri
,
489 struct lttcomm_relayd_sock
**relayd_sock
)
492 struct lttcomm_relayd_sock
*rsock
;
494 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
495 RELAYD_VERSION_COMM_MINOR
);
497 ret
= LTTNG_ERR_FATAL
;
502 * Connect to relayd so we can proceed with a session creation. This call
503 * can possibly block for an arbitrary amount of time to set the health
504 * state to be in poll execution.
507 ret
= relayd_connect(rsock
);
510 ERR("Unable to reach lttng-relayd");
511 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
515 /* Create socket for control stream. */
516 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
517 DBG3("Creating relayd stream socket from URI");
519 /* Check relayd version */
520 ret
= relayd_version_check(rsock
);
522 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
525 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
526 DBG3("Creating relayd data socket from URI");
528 /* Command is not valid */
529 ERR("Relayd invalid stream type: %d", uri
->stype
);
530 ret
= LTTNG_ERR_INVALID
;
534 *relayd_sock
= rsock
;
539 /* The returned value is not useful since we are on an error path. */
540 (void) relayd_close(rsock
);
548 * Connect to the relayd using URI and send the socket to the right consumer.
550 static int send_consumer_relayd_socket(int domain
, unsigned int session_id
,
551 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
552 struct consumer_socket
*consumer_sock
)
555 struct lttcomm_relayd_sock
*rsock
= NULL
;
557 /* Connect to relayd and make version check if uri is the control. */
558 ret
= create_connect_relayd(relayd_uri
, &rsock
);
559 if (ret
!= LTTNG_OK
) {
564 /* Set the network sequence index if not set. */
565 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
566 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
568 * Increment net_seq_idx because we are about to transfer the
569 * new relayd socket to the consumer.
570 * Assign unique key so the consumer can match streams.
572 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
573 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
576 /* Send relayd socket to consumer. */
577 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
578 relayd_uri
->stype
, session_id
);
580 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
584 /* Flag that the corresponding socket was sent. */
585 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
586 consumer_sock
->control_sock_sent
= 1;
587 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
588 consumer_sock
->data_sock_sent
= 1;
594 * Close socket which was dup on the consumer side. The session daemon does
595 * NOT keep track of the relayd socket(s) once transfer to the consumer.
599 (void) relayd_close(rsock
);
603 if (ret
!= LTTNG_OK
) {
605 * The consumer output for this session should not be used anymore
606 * since the relayd connection failed thus making any tracing or/and
607 * streaming not usable.
609 consumer
->enabled
= 0;
615 * Send both relayd sockets to a specific consumer and domain. This is a
616 * helper function to facilitate sending the information to the consumer for a
619 static int send_consumer_relayd_sockets(int domain
, unsigned int session_id
,
620 struct consumer_output
*consumer
, struct consumer_socket
*sock
)
627 /* Sending control relayd socket. */
628 if (!sock
->control_sock_sent
) {
629 ret
= send_consumer_relayd_socket(domain
, session_id
,
630 &consumer
->dst
.net
.control
, consumer
, sock
);
631 if (ret
!= LTTNG_OK
) {
636 /* Sending data relayd socket. */
637 if (!sock
->data_sock_sent
) {
638 ret
= send_consumer_relayd_socket(domain
, session_id
,
639 &consumer
->dst
.net
.data
, consumer
, sock
);
640 if (ret
!= LTTNG_OK
) {
650 * Setup relayd connections for a tracing session. First creates the socket to
651 * the relayd and send them to the right domain consumer. Consumer type MUST be
654 int cmd_setup_relayd(struct ltt_session
*session
)
657 struct ltt_ust_session
*usess
;
658 struct ltt_kernel_session
*ksess
;
659 struct consumer_socket
*socket
;
660 struct lttng_ht_iter iter
;
664 usess
= session
->ust_session
;
665 ksess
= session
->kernel_session
;
667 DBG("Setting relayd for session %s", session
->name
);
671 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
672 && usess
->consumer
->enabled
) {
673 /* For each consumer socket, send relayd sockets */
674 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
676 /* Code flow error */
677 assert(socket
->fd
>= 0);
679 pthread_mutex_lock(socket
->lock
);
680 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
->id
,
681 usess
->consumer
, socket
);
682 pthread_mutex_unlock(socket
->lock
);
683 if (ret
!= LTTNG_OK
) {
686 /* Session is now ready for network streaming. */
687 session
->net_handle
= 1;
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
->id
,
700 ksess
->consumer
, socket
);
701 pthread_mutex_unlock(socket
->lock
);
702 if (ret
!= LTTNG_OK
) {
705 /* Session is now ready for network streaming. */
706 session
->net_handle
= 1;
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
&& ksess
->output_traces
) {
725 ret
= kernel_open_metadata(ksess
);
727 ret
= LTTNG_ERR_KERN_META_FAIL
;
732 /* Open kernel metadata stream */
733 if (ksess
->metadata
&& 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
);
860 * Don't try to enable a channel if the session has been started at
861 * some point in time before. The tracer does not allow it.
863 if (session
->started
) {
864 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
870 switch (domain
->type
) {
871 case LTTNG_DOMAIN_KERNEL
:
873 struct ltt_kernel_channel
*kchan
;
875 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
876 session
->kernel_session
);
878 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
880 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
883 if (ret
!= LTTNG_OK
) {
887 kernel_wait_quiescent(kernel_tracer_fd
);
890 case LTTNG_DOMAIN_UST
:
892 struct ltt_ust_channel
*uchan
;
894 chan_ht
= usess
->domain_global
.channels
;
896 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
898 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
900 ret
= channel_ust_enable(usess
, uchan
);
905 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
916 * Command LTTNG_DISABLE_EVENT processed by the client thread.
918 int cmd_disable_event(struct ltt_session
*session
, int domain
,
919 char *channel_name
, char *event_name
)
926 case LTTNG_DOMAIN_KERNEL
:
928 struct ltt_kernel_channel
*kchan
;
929 struct ltt_kernel_session
*ksess
;
931 ksess
= session
->kernel_session
;
933 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
935 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
939 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
940 if (ret
!= LTTNG_OK
) {
944 kernel_wait_quiescent(kernel_tracer_fd
);
947 case LTTNG_DOMAIN_UST
:
949 struct ltt_ust_channel
*uchan
;
950 struct ltt_ust_session
*usess
;
952 usess
= session
->ust_session
;
954 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
957 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
961 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
962 if (ret
!= LTTNG_OK
) {
966 DBG3("Disable UST event %s in channel %s completed", event_name
,
971 case LTTNG_DOMAIN_UST_EXEC_NAME
:
972 case LTTNG_DOMAIN_UST_PID
:
973 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
988 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
990 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
998 case LTTNG_DOMAIN_KERNEL
:
1000 struct ltt_kernel_session
*ksess
;
1001 struct ltt_kernel_channel
*kchan
;
1003 ksess
= session
->kernel_session
;
1005 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1006 if (kchan
== NULL
) {
1007 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1011 ret
= event_kernel_disable_all(kchan
);
1012 if (ret
!= LTTNG_OK
) {
1016 kernel_wait_quiescent(kernel_tracer_fd
);
1019 case LTTNG_DOMAIN_UST
:
1021 struct ltt_ust_session
*usess
;
1022 struct ltt_ust_channel
*uchan
;
1024 usess
= session
->ust_session
;
1026 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1028 if (uchan
== NULL
) {
1029 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1033 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1038 DBG3("Disable all UST events in channel %s completed", channel_name
);
1043 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1044 case LTTNG_DOMAIN_UST_PID
:
1045 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1048 ret
= LTTNG_ERR_UND
;
1060 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1062 int cmd_add_context(struct ltt_session
*session
, int domain
,
1063 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1065 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1068 case LTTNG_DOMAIN_KERNEL
:
1069 assert(session
->kernel_session
);
1071 if (session
->kernel_session
->channel_count
== 0) {
1072 /* Create default channel */
1073 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1074 if (ret
!= LTTNG_OK
) {
1077 chan_kern_created
= 1;
1080 /* Add kernel context to kernel tracer */
1081 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1082 if (ret
!= LTTNG_OK
) {
1086 case LTTNG_DOMAIN_UST
:
1088 struct ltt_ust_session
*usess
= session
->ust_session
;
1091 unsigned int chan_count
=
1092 lttng_ht_get_count(usess
->domain_global
.channels
);
1093 if (chan_count
== 0) {
1094 struct lttng_channel
*attr
;
1095 /* Create default channel */
1096 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1098 ret
= LTTNG_ERR_FATAL
;
1102 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1103 if (ret
!= LTTNG_OK
) {
1108 chan_ust_created
= 1;
1111 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1112 if (ret
!= LTTNG_OK
) {
1118 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1119 case LTTNG_DOMAIN_UST_PID
:
1120 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1123 ret
= LTTNG_ERR_UND
;
1130 if (chan_kern_created
) {
1131 struct ltt_kernel_channel
*kchan
=
1132 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1133 session
->kernel_session
);
1134 /* Created previously, this should NOT fail. */
1136 kernel_destroy_channel(kchan
);
1139 if (chan_ust_created
) {
1140 struct ltt_ust_channel
*uchan
=
1141 trace_ust_find_channel_by_name(
1142 session
->ust_session
->domain_global
.channels
,
1143 DEFAULT_CHANNEL_NAME
);
1144 /* Created previously, this should NOT fail. */
1146 /* Remove from the channel list of the session. */
1147 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1149 trace_ust_destroy_channel(uchan
);
1155 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1157 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1158 char *channel_name
, struct lttng_event
*event
,
1159 struct lttng_filter_bytecode
*filter
, int wpipe
)
1161 int ret
, channel_created
= 0;
1162 struct lttng_channel
*attr
;
1166 assert(channel_name
);
1170 switch (domain
->type
) {
1171 case LTTNG_DOMAIN_KERNEL
:
1173 struct ltt_kernel_channel
*kchan
;
1175 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1176 session
->kernel_session
);
1177 if (kchan
== NULL
) {
1178 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1179 LTTNG_BUFFER_GLOBAL
);
1181 ret
= LTTNG_ERR_FATAL
;
1184 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1186 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1187 if (ret
!= LTTNG_OK
) {
1193 channel_created
= 1;
1196 /* Get the newly created kernel channel pointer */
1197 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1198 session
->kernel_session
);
1199 if (kchan
== NULL
) {
1200 /* This sould not happen... */
1201 ret
= LTTNG_ERR_FATAL
;
1205 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1206 if (ret
!= LTTNG_OK
) {
1207 if (channel_created
) {
1208 /* Let's not leak a useless channel. */
1209 kernel_destroy_channel(kchan
);
1214 kernel_wait_quiescent(kernel_tracer_fd
);
1217 case LTTNG_DOMAIN_UST
:
1219 struct ltt_ust_channel
*uchan
;
1220 struct ltt_ust_session
*usess
= session
->ust_session
;
1224 /* Get channel from global UST domain */
1225 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1227 if (uchan
== NULL
) {
1228 /* Create default channel */
1229 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1230 usess
->buffer_type
);
1232 ret
= LTTNG_ERR_FATAL
;
1235 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1237 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1238 if (ret
!= LTTNG_OK
) {
1244 /* Get the newly created channel reference back */
1245 uchan
= trace_ust_find_channel_by_name(
1246 usess
->domain_global
.channels
, channel_name
);
1250 /* At this point, the session and channel exist on the tracer */
1251 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
, filter
);
1252 if (ret
!= LTTNG_OK
) {
1258 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1259 case LTTNG_DOMAIN_UST_PID
:
1260 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1263 ret
= LTTNG_ERR_UND
;
1275 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1277 int cmd_enable_event_all(struct ltt_session
*session
,
1278 struct lttng_domain
*domain
, char *channel_name
, int event_type
,
1279 struct lttng_filter_bytecode
*filter
, int wpipe
)
1282 struct lttng_channel
*attr
;
1285 assert(channel_name
);
1289 switch (domain
->type
) {
1290 case LTTNG_DOMAIN_KERNEL
:
1292 struct ltt_kernel_channel
*kchan
;
1294 assert(session
->kernel_session
);
1296 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1297 session
->kernel_session
);
1298 if (kchan
== NULL
) {
1299 /* Create default channel */
1300 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1301 LTTNG_BUFFER_GLOBAL
);
1303 ret
= LTTNG_ERR_FATAL
;
1306 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1308 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1309 if (ret
!= LTTNG_OK
) {
1315 /* Get the newly created kernel channel pointer */
1316 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1317 session
->kernel_session
);
1321 switch (event_type
) {
1322 case LTTNG_EVENT_SYSCALL
:
1323 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1325 case LTTNG_EVENT_TRACEPOINT
:
1327 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1328 * events already registered to the channel.
1330 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1332 case LTTNG_EVENT_ALL
:
1333 /* Enable syscalls and tracepoints */
1334 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1337 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1341 /* Manage return value */
1342 if (ret
!= LTTNG_OK
) {
1344 * On error, cmd_enable_channel call will take care of destroying
1345 * the created channel if it was needed.
1350 kernel_wait_quiescent(kernel_tracer_fd
);
1353 case LTTNG_DOMAIN_UST
:
1355 struct ltt_ust_channel
*uchan
;
1356 struct ltt_ust_session
*usess
= session
->ust_session
;
1360 /* Get channel from global UST domain */
1361 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1363 if (uchan
== NULL
) {
1364 /* Create default channel */
1365 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1366 usess
->buffer_type
);
1368 ret
= LTTNG_ERR_FATAL
;
1371 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1373 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1374 if (ret
!= LTTNG_OK
) {
1380 /* Get the newly created channel reference back */
1381 uchan
= trace_ust_find_channel_by_name(
1382 usess
->domain_global
.channels
, channel_name
);
1386 /* At this point, the session and channel exist on the tracer */
1388 switch (event_type
) {
1389 case LTTNG_EVENT_ALL
:
1390 case LTTNG_EVENT_TRACEPOINT
:
1391 ret
= event_ust_enable_all_tracepoints(usess
, uchan
, filter
);
1392 if (ret
!= LTTNG_OK
) {
1397 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1401 /* Manage return value */
1402 if (ret
!= LTTNG_OK
) {
1409 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1410 case LTTNG_DOMAIN_UST_PID
:
1411 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1414 ret
= LTTNG_ERR_UND
;
1427 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1429 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1432 ssize_t nb_events
= 0;
1435 case LTTNG_DOMAIN_KERNEL
:
1436 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1437 if (nb_events
< 0) {
1438 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1442 case LTTNG_DOMAIN_UST
:
1443 nb_events
= ust_app_list_events(events
);
1444 if (nb_events
< 0) {
1445 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1450 ret
= LTTNG_ERR_UND
;
1457 /* Return negative value to differentiate return code */
1462 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1464 ssize_t
cmd_list_tracepoint_fields(int domain
,
1465 struct lttng_event_field
**fields
)
1468 ssize_t nb_fields
= 0;
1471 case LTTNG_DOMAIN_UST
:
1472 nb_fields
= ust_app_list_event_fields(fields
);
1473 if (nb_fields
< 0) {
1474 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1478 case LTTNG_DOMAIN_KERNEL
:
1479 default: /* fall-through */
1480 ret
= LTTNG_ERR_UND
;
1487 /* Return negative value to differentiate return code */
1492 * Command LTTNG_START_TRACE processed by the client thread.
1494 int cmd_start_trace(struct ltt_session
*session
)
1497 struct ltt_kernel_session
*ksession
;
1498 struct ltt_ust_session
*usess
;
1502 /* Ease our life a bit ;) */
1503 ksession
= session
->kernel_session
;
1504 usess
= session
->ust_session
;
1506 if (session
->enabled
) {
1507 /* Already started. */
1508 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1512 session
->enabled
= 1;
1514 /* Kernel tracing */
1515 if (ksession
!= NULL
) {
1516 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1517 if (ret
!= LTTNG_OK
) {
1522 /* Flag session that trace should start automatically */
1524 usess
->start_trace
= 1;
1526 ret
= ust_app_start_trace_all(usess
);
1528 ret
= LTTNG_ERR_UST_START_FAIL
;
1533 session
->started
= 1;
1542 * Command LTTNG_STOP_TRACE processed by the client thread.
1544 int cmd_stop_trace(struct ltt_session
*session
)
1547 struct ltt_kernel_channel
*kchan
;
1548 struct ltt_kernel_session
*ksession
;
1549 struct ltt_ust_session
*usess
;
1554 ksession
= session
->kernel_session
;
1555 usess
= session
->ust_session
;
1557 if (!session
->enabled
) {
1558 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1562 session
->enabled
= 0;
1565 if (ksession
&& ksession
->started
) {
1566 DBG("Stop kernel tracing");
1568 /* Flush metadata if exist */
1569 if (ksession
->metadata_stream_fd
>= 0) {
1570 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1572 ERR("Kernel metadata flush failed");
1576 /* Flush all buffers before stopping */
1577 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1578 ret
= kernel_flush_buffer(kchan
);
1580 ERR("Kernel flush buffer error");
1584 ret
= kernel_stop_session(ksession
);
1586 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1590 kernel_wait_quiescent(kernel_tracer_fd
);
1592 ksession
->started
= 0;
1595 if (usess
&& usess
->start_trace
) {
1596 usess
->start_trace
= 0;
1598 ret
= ust_app_stop_trace_all(usess
);
1600 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1612 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1614 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1615 size_t nb_uri
, struct lttng_uri
*uris
)
1618 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1619 struct ltt_ust_session
*usess
= session
->ust_session
;
1620 struct consumer_output
*consumer
= NULL
;
1626 /* Can't enable consumer after session started. */
1627 if (session
->enabled
) {
1628 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1633 * This case switch makes sure the domain session has a temporary consumer
1634 * so the URL can be set.
1638 /* Code flow error. A session MUST always have a consumer object */
1639 assert(session
->consumer
);
1641 * The URL will be added to the tracing session consumer instead of a
1642 * specific domain consumer.
1644 consumer
= session
->consumer
;
1646 case LTTNG_DOMAIN_KERNEL
:
1647 /* Code flow error if we don't have a kernel session here. */
1649 assert(ksess
->consumer
);
1650 consumer
= ksess
->consumer
;
1652 case LTTNG_DOMAIN_UST
:
1653 /* Code flow error if we don't have a kernel session here. */
1655 assert(usess
->consumer
);
1656 consumer
= usess
->consumer
;
1660 for (i
= 0; i
< nb_uri
; i
++) {
1661 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1662 if (ret
!= LTTNG_OK
) {
1675 * Command LTTNG_CREATE_SESSION processed by the client thread.
1677 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1678 size_t nb_uri
, lttng_sock_cred
*creds
)
1681 struct ltt_session
*session
;
1687 * Verify if the session already exist
1689 * XXX: There is no need for the session lock list here since the caller
1690 * (process_client_msg) is holding it. We might want to change that so a
1691 * single command does not lock the entire session list.
1693 session
= session_find_by_name(name
);
1694 if (session
!= NULL
) {
1695 ret
= LTTNG_ERR_EXIST_SESS
;
1699 /* Create tracing session in the registry */
1700 ret
= session_create(name
, LTTNG_SOCK_GET_UID_CRED(creds
),
1701 LTTNG_SOCK_GET_GID_CRED(creds
));
1702 if (ret
!= LTTNG_OK
) {
1707 * Get the newly created session pointer back
1709 * XXX: There is no need for the session lock list here since the caller
1710 * (process_client_msg) is holding it. We might want to change that so a
1711 * single command does not lock the entire session list.
1713 session
= session_find_by_name(name
);
1716 /* Create default consumer output for the session not yet created. */
1717 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1718 if (session
->consumer
== NULL
) {
1719 ret
= LTTNG_ERR_FATAL
;
1720 goto consumer_error
;
1724 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1725 if (ret
!= LTTNG_OK
) {
1726 goto consumer_error
;
1728 session
->output_traces
= 1;
1730 session
->output_traces
= 0;
1731 DBG2("Session %s created with no output", session
->name
);
1734 session
->consumer
->enabled
= 1;
1739 session_destroy(session
);
1746 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1748 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1751 struct ltt_ust_session
*usess
;
1752 struct ltt_kernel_session
*ksess
;
1757 usess
= session
->ust_session
;
1758 ksess
= session
->kernel_session
;
1760 /* Clean kernel session teardown */
1761 kernel_destroy_session(ksess
);
1763 /* UST session teardown */
1765 /* Close any relayd session */
1766 consumer_output_send_destroy_relayd(usess
->consumer
);
1768 /* Destroy every UST application related to this session. */
1769 ret
= ust_app_destroy_trace_all(usess
);
1771 ERR("Error in ust_app_destroy_trace_all");
1774 /* Clean up the rest. */
1775 trace_ust_destroy_session(usess
);
1779 * Must notify the kernel thread here to update it's poll set in order to
1780 * remove the channel(s)' fd just destroyed.
1782 ret
= notify_thread_pipe(wpipe
);
1784 PERROR("write kernel poll pipe");
1787 ret
= session_destroy(session
);
1793 * Command LTTNG_CALIBRATE processed by the client thread.
1795 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1800 case LTTNG_DOMAIN_KERNEL
:
1802 struct lttng_kernel_calibrate kcalibrate
;
1804 kcalibrate
.type
= calibrate
->type
;
1805 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1807 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1812 case LTTNG_DOMAIN_UST
:
1814 struct lttng_ust_calibrate ucalibrate
;
1816 ucalibrate
.type
= calibrate
->type
;
1817 ret
= ust_app_calibrate_glb(&ucalibrate
);
1819 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1825 ret
= LTTNG_ERR_UND
;
1836 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1838 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1839 const char *sock_path
, struct consumer_data
*cdata
)
1842 struct consumer_socket
*socket
= NULL
;
1849 case LTTNG_DOMAIN_KERNEL
:
1851 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1855 /* Can't register a consumer if there is already one */
1856 if (ksess
->consumer_fds_sent
!= 0) {
1857 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1861 sock
= lttcomm_connect_unix_sock(sock_path
);
1863 ret
= LTTNG_ERR_CONNECT_FAIL
;
1867 socket
= consumer_allocate_socket(sock
);
1868 if (socket
== NULL
) {
1871 PERROR("close register consumer");
1873 ret
= LTTNG_ERR_FATAL
;
1877 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1878 if (socket
->lock
== NULL
) {
1879 PERROR("zmalloc pthread mutex");
1880 ret
= LTTNG_ERR_FATAL
;
1883 pthread_mutex_init(socket
->lock
, NULL
);
1884 socket
->registered
= 1;
1887 consumer_add_socket(socket
, ksess
->consumer
);
1890 pthread_mutex_lock(&cdata
->pid_mutex
);
1892 pthread_mutex_unlock(&cdata
->pid_mutex
);
1897 /* TODO: Userspace tracing */
1898 ret
= LTTNG_ERR_UND
;
1906 consumer_destroy_socket(socket
);
1912 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1914 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1915 struct lttng_domain
**domains
)
1920 if (session
->kernel_session
!= NULL
) {
1921 DBG3("Listing domains found kernel domain");
1925 if (session
->ust_session
!= NULL
) {
1926 DBG3("Listing domains found UST global domain");
1930 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1931 if (*domains
== NULL
) {
1932 ret
= LTTNG_ERR_FATAL
;
1936 if (session
->kernel_session
!= NULL
) {
1937 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1941 if (session
->ust_session
!= NULL
) {
1942 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1943 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
1950 /* Return negative value to differentiate return code */
1956 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1958 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1959 struct lttng_channel
**channels
)
1962 ssize_t nb_chan
= 0;
1965 case LTTNG_DOMAIN_KERNEL
:
1966 if (session
->kernel_session
!= NULL
) {
1967 nb_chan
= session
->kernel_session
->channel_count
;
1969 DBG3("Number of kernel channels %zd", nb_chan
);
1971 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1974 case LTTNG_DOMAIN_UST
:
1975 if (session
->ust_session
!= NULL
) {
1976 nb_chan
= lttng_ht_get_count(
1977 session
->ust_session
->domain_global
.channels
);
1979 DBG3("Number of UST global channels %zd", nb_chan
);
1981 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1986 ret
= LTTNG_ERR_UND
;
1991 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
1992 if (*channels
== NULL
) {
1993 ret
= LTTNG_ERR_FATAL
;
1997 list_lttng_channels(domain
, session
, *channels
);
2000 /* Ret value was set in the domain switch case */
2007 /* Return negative value to differentiate return code */
2012 * Command LTTNG_LIST_EVENTS processed by the client thread.
2014 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2015 char *channel_name
, struct lttng_event
**events
)
2018 ssize_t nb_event
= 0;
2021 case LTTNG_DOMAIN_KERNEL
:
2022 if (session
->kernel_session
!= NULL
) {
2023 nb_event
= list_lttng_kernel_events(channel_name
,
2024 session
->kernel_session
, events
);
2027 case LTTNG_DOMAIN_UST
:
2029 if (session
->ust_session
!= NULL
) {
2030 nb_event
= list_lttng_ust_global_events(channel_name
,
2031 &session
->ust_session
->domain_global
, events
);
2036 ret
= LTTNG_ERR_UND
;
2043 /* Return negative value to differentiate return code */
2048 * Using the session list, filled a lttng_session array to send back to the
2049 * client for session listing.
2051 * The session list lock MUST be acquired before calling this function. Use
2052 * session_lock_list() and session_unlock_list().
2054 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2059 struct ltt_session
*session
;
2060 struct ltt_session_list
*list
= session_get_list();
2062 DBG("Getting all available session for UID %d GID %d",
2065 * Iterate over session list and append data after the control struct in
2068 cds_list_for_each_entry(session
, &list
->head
, list
) {
2070 * Only list the sessions the user can control.
2072 if (!session_access_ok(session
, uid
, gid
)) {
2076 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2077 struct ltt_ust_session
*usess
= session
->ust_session
;
2079 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2080 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2081 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2082 ret
= build_network_session_path(sessions
[i
].path
,
2083 sizeof(sessions
[i
].path
), session
);
2085 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
2086 session
->consumer
->dst
.trace_path
);
2089 PERROR("snprintf session path");
2093 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2094 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2095 sessions
[i
].enabled
= session
->enabled
;
2101 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2102 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2104 int cmd_data_pending(struct ltt_session
*session
)
2107 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2108 struct ltt_ust_session
*usess
= session
->ust_session
;
2112 /* Session MUST be stopped to ask for data availability. */
2113 if (session
->enabled
) {
2114 ret
= LTTNG_ERR_SESSION_STARTED
;
2118 if (ksess
&& ksess
->consumer
) {
2119 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2121 /* Data is still being extracted for the kernel. */
2126 if (usess
&& usess
->consumer
) {
2127 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2129 /* Data is still being extracted for the kernel. */
2134 /* Data is ready to be read by a viewer */
2142 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2144 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2146 int cmd_snapshot_add_output(struct ltt_session
*session
,
2147 struct lttng_snapshot_output
*output
, uint32_t *id
)
2150 struct snapshot_output
*new_output
;
2155 DBG("Cmd snapshot add output for session %s", session
->name
);
2158 * Persmission denied to create an output if the session is not set in no
2161 if (session
->output_traces
) {
2162 ret
= LTTNG_ERR_EPERM
;
2166 /* Only one output is allowed until we have the "tee" feature. */
2167 if (session
->snapshot
.nb_output
== 1) {
2168 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
2172 new_output
= snapshot_output_alloc();
2174 ret
= LTTNG_ERR_NOMEM
;
2178 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2179 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
2180 &session
->snapshot
);
2182 if (ret
== -ENOMEM
) {
2183 ret
= LTTNG_ERR_NOMEM
;
2185 ret
= LTTNG_ERR_INVALID
;
2191 * Copy sockets so the snapshot output can use them on destroy.
2194 if (session
->ust_session
) {
2195 ret
= consumer_copy_sockets(new_output
->consumer
,
2196 session
->ust_session
->consumer
);
2200 new_output
->ust_sockets_copied
= 1;
2202 if (session
->kernel_session
) {
2203 ret
= consumer_copy_sockets(new_output
->consumer
,
2204 session
->kernel_session
->consumer
);
2208 new_output
->kernel_sockets_copied
= 1;
2212 snapshot_add_output(&session
->snapshot
, new_output
);
2214 *id
= new_output
->id
;
2221 snapshot_output_destroy(new_output
);
2227 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2229 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2231 int cmd_snapshot_del_output(struct ltt_session
*session
,
2232 struct lttng_snapshot_output
*output
)
2235 struct snapshot_output
*sout
;
2240 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
2246 * Persmission denied to create an output if the session is not set in no
2249 if (session
->output_traces
) {
2250 ret
= LTTNG_ERR_EPERM
;
2254 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
2256 ret
= LTTNG_ERR_INVALID
;
2260 snapshot_delete_output(&session
->snapshot
, sout
);
2261 snapshot_output_destroy(sout
);
2270 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2272 * If no output is available, outputs is untouched and 0 is returned.
2274 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2276 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
2277 struct lttng_snapshot_output
**outputs
)
2280 struct lttng_snapshot_output
*list
;
2281 struct lttng_ht_iter iter
;
2282 struct snapshot_output
*output
;
2287 DBG("Cmd snapshot list outputs for session %s", session
->name
);
2290 * Persmission denied to create an output if the session is not set in no
2293 if (session
->output_traces
) {
2294 ret
= LTTNG_ERR_EPERM
;
2298 if (session
->snapshot
.nb_output
== 0) {
2303 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
2305 ret
= LTTNG_ERR_NOMEM
;
2309 /* Copy list from session to the new list object. */
2310 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
2311 output
, node
.node
) {
2312 assert(output
->consumer
);
2313 list
[idx
].id
= output
->id
;
2314 list
[idx
].max_size
= output
->max_size
;
2315 strncpy(list
[idx
].name
, output
->name
, sizeof(list
[idx
].name
));
2316 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
2317 strncpy(list
[idx
].ctrl_url
, output
->consumer
->dst
.trace_path
,
2318 sizeof(list
[idx
].ctrl_url
));
2321 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
2322 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
2324 ret
= LTTNG_ERR_NOMEM
;
2329 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
2330 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
2332 ret
= LTTNG_ERR_NOMEM
;
2340 return session
->snapshot
.nb_output
;
2349 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2350 * snapshot output is *not* set with a remote destination.
2352 * Return 0 on success or else a negative value.
2354 static int set_relayd_for_snapshot(struct consumer_output
*consumer
,
2355 struct snapshot_output
*snap_output
, struct ltt_session
*session
)
2358 struct lttng_ht_iter iter
;
2359 struct consumer_socket
*socket
;
2362 assert(snap_output
);
2365 DBG2("Set relayd object from snapshot output");
2367 /* Ignore if snapshot consumer output is not network. */
2368 if (snap_output
->consumer
->type
!= CONSUMER_DST_NET
) {
2373 * For each consumer socket, create and send the relayd object of the
2377 cds_lfht_for_each_entry(snap_output
->consumer
->socks
->ht
, &iter
.iter
,
2378 socket
, node
.node
) {
2379 ret
= send_consumer_relayd_sockets(0, session
->id
,
2380 snap_output
->consumer
, socket
);
2393 * Record a kernel snapshot.
2395 * Return 0 on success or else a negative value.
2397 static int record_kernel_snapshot(struct ltt_kernel_session
*ksess
,
2398 struct snapshot_output
*output
, struct ltt_session
*session
, int wait
)
2406 if (!output
->kernel_sockets_copied
) {
2407 ret
= consumer_copy_sockets(output
->consumer
, ksess
->consumer
);
2411 output
->kernel_sockets_copied
= 1;
2414 ret
= set_relayd_for_snapshot(ksess
->consumer
, output
, session
);
2419 ret
= kernel_snapshot_record(ksess
, output
, wait
);
2429 * Record a UST snapshot.
2431 * Return 0 on success or else a negative value.
2433 static int record_ust_snapshot(struct ltt_ust_session
*usess
,
2434 struct snapshot_output
*output
, struct ltt_session
*session
, int wait
)
2442 if (!output
->ust_sockets_copied
) {
2443 ret
= consumer_copy_sockets(output
->consumer
, usess
->consumer
);
2447 output
->ust_sockets_copied
= 1;
2450 ret
= set_relayd_for_snapshot(usess
->consumer
, output
, session
);
2455 ret
= ust_app_snapshot_record(usess
, output
, wait
);
2465 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2467 * The wait parameter is ignored so this call always wait for the snapshot to
2468 * complete before returning.
2470 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2472 int cmd_snapshot_record(struct ltt_session
*session
,
2473 struct lttng_snapshot_output
*output
, int wait
)
2476 struct snapshot_output
*tmp_sout
= NULL
;
2480 DBG("Cmd snapshot record for session %s", session
->name
);
2483 * Persmission denied to create an output if the session is not set in no
2486 if (session
->output_traces
) {
2487 ret
= LTTNG_ERR_EPERM
;
2491 /* The session needs to be started at least once. */
2492 if (!session
->started
) {
2493 ret
= LTTNG_ERR_START_SESSION_ONCE
;
2497 /* Use temporary output for the session. */
2498 if (output
&& *output
->ctrl_url
!= '\0') {
2499 tmp_sout
= snapshot_output_alloc();
2501 ret
= LTTNG_ERR_NOMEM
;
2505 ret
= snapshot_output_init(output
->max_size
, output
->name
,
2506 output
->ctrl_url
, output
->data_url
, session
->consumer
,
2509 if (ret
== -ENOMEM
) {
2510 ret
= LTTNG_ERR_NOMEM
;
2512 ret
= LTTNG_ERR_INVALID
;
2518 if (session
->kernel_session
) {
2519 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2522 ret
= record_kernel_snapshot(ksess
, tmp_sout
, session
, wait
);
2527 struct snapshot_output
*sout
;
2528 struct lttng_ht_iter iter
;
2531 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
2532 &iter
.iter
, sout
, node
.node
) {
2533 ret
= record_kernel_snapshot(ksess
, sout
, session
, wait
);
2543 if (session
->ust_session
) {
2544 struct ltt_ust_session
*usess
= session
->ust_session
;
2547 ret
= record_ust_snapshot(usess
, tmp_sout
, session
, wait
);
2552 struct snapshot_output
*sout
;
2553 struct lttng_ht_iter iter
;
2556 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
2557 &iter
.iter
, sout
, node
.node
) {
2558 ret
= record_ust_snapshot(usess
, tmp_sout
, session
, wait
);
2570 snapshot_output_destroy(tmp_sout
);
2576 * Init command subsystem.
2581 * Set network sequence index to 1 for streams to match a relayd
2582 * socket on the consumer side.
2584 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
2585 relayd_net_seq_idx
= 1;
2586 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
2588 DBG("Command subsystem initialized");