2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #include <urcu/list.h>
21 #include <urcu/uatomic.h>
23 #include <common/defaults.h>
24 #include <common/common.h>
25 #include <common/sessiond-comm/sessiond-comm.h>
26 #include <common/relayd/relayd.h>
33 #include "kernel-consumer.h"
34 #include "lttng-sessiond.h"
40 * Used to keep a unique index for each relayd socket created where this value
41 * is associated with streams on the consumer so it can match the right relayd
42 * to send to. It must be accessed with the relayd_net_seq_idx_lock
45 static pthread_mutex_t relayd_net_seq_idx_lock
= PTHREAD_MUTEX_INITIALIZER
;
46 static uint64_t relayd_net_seq_idx
;
49 * Create a session path used by list_lttng_sessions for the case that the
50 * session consumer is on the network.
52 static int build_network_session_path(char *dst
, size_t size
,
53 struct ltt_session
*session
)
55 int ret
, kdata_port
, udata_port
;
56 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
57 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
62 memset(tmp_urls
, 0, sizeof(tmp_urls
));
63 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
65 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
67 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
68 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
69 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
72 if (session
->ust_session
&& session
->ust_session
->consumer
) {
73 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
74 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
77 if (uuri
== NULL
&& kuri
== NULL
) {
78 uri
= &session
->consumer
->dst
.net
.control
;
79 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
80 } else if (kuri
&& uuri
) {
81 ret
= uri_compare(kuri
, uuri
);
85 /* Build uuri URL string */
86 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
93 } else if (kuri
&& uuri
== NULL
) {
95 } else if (uuri
&& kuri
== NULL
) {
99 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
105 * Do we have a UST url set. If yes, this means we have both kernel and UST
108 if (*tmp_uurl
!= '\0') {
109 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
110 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
116 /* No kernel URI, use the UST port. */
119 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, dport
);
127 * Fill lttng_channel array of all channels.
129 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
130 struct lttng_channel
*channels
)
133 struct ltt_kernel_channel
*kchan
;
135 DBG("Listing channels for session %s", session
->name
);
138 case LTTNG_DOMAIN_KERNEL
:
139 /* Kernel channels */
140 if (session
->kernel_session
!= NULL
) {
141 cds_list_for_each_entry(kchan
,
142 &session
->kernel_session
->channel_list
.head
, list
) {
143 /* Copy lttng_channel struct to array */
144 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
145 channels
[i
].enabled
= kchan
->enabled
;
150 case LTTNG_DOMAIN_UST
:
152 struct lttng_ht_iter iter
;
153 struct ltt_ust_channel
*uchan
;
156 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
157 &iter
.iter
, uchan
, node
.node
) {
158 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
159 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
160 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
161 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
162 channels
[i
].attr
.switch_timer_interval
=
163 uchan
->attr
.switch_timer_interval
;
164 channels
[i
].attr
.read_timer_interval
=
165 uchan
->attr
.read_timer_interval
;
166 channels
[i
].enabled
= uchan
->enabled
;
167 switch (uchan
->attr
.output
) {
170 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
184 * Create a list of ust global domain events.
186 static int list_lttng_ust_global_events(char *channel_name
,
187 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
190 unsigned int nb_event
= 0;
191 struct lttng_ht_iter iter
;
192 struct lttng_ht_node_str
*node
;
193 struct ltt_ust_channel
*uchan
;
194 struct ltt_ust_event
*uevent
;
195 struct lttng_event
*tmp
;
197 DBG("Listing UST global events for channel %s", channel_name
);
201 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
202 node
= lttng_ht_iter_get_node_str(&iter
);
204 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
208 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
210 nb_event
+= lttng_ht_get_count(uchan
->events
);
217 DBG3("Listing UST global %d events", nb_event
);
219 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
221 ret
= LTTNG_ERR_FATAL
;
225 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
226 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
227 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
228 tmp
[i
].enabled
= uevent
->enabled
;
230 switch (uevent
->attr
.instrumentation
) {
231 case LTTNG_UST_TRACEPOINT
:
232 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
234 case LTTNG_UST_PROBE
:
235 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
237 case LTTNG_UST_FUNCTION
:
238 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
242 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
243 switch (uevent
->attr
.loglevel_type
) {
244 case LTTNG_UST_LOGLEVEL_ALL
:
245 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
247 case LTTNG_UST_LOGLEVEL_RANGE
:
248 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
250 case LTTNG_UST_LOGLEVEL_SINGLE
:
251 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
254 if (uevent
->filter
) {
269 * Fill lttng_event array of all kernel events in the channel.
271 static int list_lttng_kernel_events(char *channel_name
,
272 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
275 unsigned int nb_event
;
276 struct ltt_kernel_event
*event
;
277 struct ltt_kernel_channel
*kchan
;
279 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
281 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
285 nb_event
= kchan
->event_count
;
287 DBG("Listing events for channel %s", kchan
->channel
->name
);
293 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
294 if (*events
== NULL
) {
295 ret
= LTTNG_ERR_FATAL
;
299 /* Kernel channels */
300 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
301 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
302 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
303 (*events
)[i
].enabled
= event
->enabled
;
305 switch (event
->event
->instrumentation
) {
306 case LTTNG_KERNEL_TRACEPOINT
:
307 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
309 case LTTNG_KERNEL_KPROBE
:
310 case LTTNG_KERNEL_KRETPROBE
:
311 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
312 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
313 sizeof(struct lttng_kernel_kprobe
));
315 case LTTNG_KERNEL_FUNCTION
:
316 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
317 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
318 sizeof(struct lttng_kernel_function
));
320 case LTTNG_KERNEL_NOOP
:
321 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
323 case LTTNG_KERNEL_SYSCALL
:
324 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
326 case LTTNG_KERNEL_ALL
:
337 /* Negate the error code to differentiate the size from an error */
342 * Add URI so the consumer output object. Set the correct path depending on the
343 * domain adding the default trace directory.
345 static int add_uri_to_consumer(struct consumer_output
*consumer
,
346 struct lttng_uri
*uri
, int domain
, const char *session_name
)
349 const char *default_trace_dir
;
353 if (consumer
== NULL
) {
354 DBG("No consumer detected. Don't add URI. Stopping.");
355 ret
= LTTNG_ERR_NO_CONSUMER
;
360 case LTTNG_DOMAIN_KERNEL
:
361 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
363 case LTTNG_DOMAIN_UST
:
364 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
368 * This case is possible is we try to add the URI to the global tracing
369 * session consumer object which in this case there is no subdir.
371 default_trace_dir
= "";
374 switch (uri
->dtype
) {
377 DBG2("Setting network URI to consumer");
379 consumer
->type
= CONSUMER_DST_NET
;
381 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
382 consumer
->dst
.net
.control_isset
) ||
383 (uri
->stype
== LTTNG_STREAM_DATA
&&
384 consumer
->dst
.net
.data_isset
)) {
385 ret
= LTTNG_ERR_URL_EXIST
;
389 /* Set URI into consumer output object */
390 ret
= consumer_set_network_uri(consumer
, uri
);
392 ret
= LTTNG_ERR_FATAL
;
394 } else if (ret
== 1) {
396 * URI was the same in the consumer so we do not append the subdir
397 * again so to not duplicate output dir.
402 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
403 ret
= consumer_set_subdir(consumer
, session_name
);
405 ret
= LTTNG_ERR_FATAL
;
410 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
411 /* On a new subdir, reappend the default trace dir. */
412 strncat(consumer
->subdir
, default_trace_dir
,
413 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
414 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
419 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
420 memset(consumer
->dst
.trace_path
, 0,
421 sizeof(consumer
->dst
.trace_path
));
422 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
423 sizeof(consumer
->dst
.trace_path
));
424 /* Append default trace dir */
425 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
426 sizeof(consumer
->dst
.trace_path
) -
427 strlen(consumer
->dst
.trace_path
) - 1);
428 /* Flag consumer as local. */
429 consumer
->type
= CONSUMER_DST_LOCAL
;
438 * Init tracing by creating trace directory and sending fds kernel consumer.
440 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
443 struct lttng_ht_iter iter
;
444 struct consumer_socket
*socket
;
450 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
451 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
453 /* Code flow error */
454 assert(socket
->fd
>= 0);
456 pthread_mutex_lock(socket
->lock
);
457 ret
= kernel_consumer_send_session(socket
, session
);
458 pthread_mutex_unlock(socket
->lock
);
460 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
472 * Create a socket to the relayd using the URI.
474 * On success, the relayd_sock pointer is set to the created socket.
475 * Else, it's stays untouched and a lttcomm error code is returned.
477 static int create_connect_relayd(struct consumer_output
*output
,
478 const char *session_name
, struct lttng_uri
*uri
,
479 struct lttcomm_sock
**relayd_sock
)
482 struct lttcomm_sock
*sock
;
484 /* Create socket object from URI */
485 sock
= lttcomm_alloc_sock_from_uri(uri
);
487 ret
= LTTNG_ERR_FATAL
;
491 ret
= lttcomm_create_sock(sock
);
493 ret
= LTTNG_ERR_FATAL
;
498 * Connect to relayd so we can proceed with a session creation. This call
499 * can possibly block for an arbitrary amount of time to set the health
500 * state to be in poll execution.
503 ret
= relayd_connect(sock
);
506 ERR("Unable to reach lttng-relayd");
507 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
511 /* Create socket for control stream. */
512 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
513 DBG3("Creating relayd stream socket from URI");
515 /* Check relayd version */
516 ret
= relayd_version_check(sock
, RELAYD_VERSION_COMM_MAJOR
,
517 RELAYD_VERSION_COMM_MINOR
);
519 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
522 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
523 DBG3("Creating relayd data socket from URI");
525 /* Command is not valid */
526 ERR("Relayd invalid stream type: %d", uri
->stype
);
527 ret
= LTTNG_ERR_INVALID
;
537 (void) relayd_close(sock
);
541 lttcomm_destroy_sock(sock
);
548 * Connect to the relayd using URI and send the socket to the right consumer.
550 static int send_consumer_relayd_socket(int domain
, struct ltt_session
*session
,
551 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
552 struct consumer_socket
*consumer_sock
)
555 struct lttcomm_sock
*sock
= NULL
;
557 /* Connect to relayd and make version check if uri is the control. */
558 ret
= create_connect_relayd(consumer
, session
->name
, relayd_uri
, &sock
);
559 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
, sock
,
582 consumer
, 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.
604 (void) relayd_close(sock
);
605 lttcomm_destroy_sock(sock
);
608 if (ret
!= LTTNG_OK
) {
610 * On error, nullify the consumer sequence index so streams are not
611 * associated with it once sent to the consumer.
613 uatomic_set(&consumer
->net_seq_index
, -1);
620 * Send both relayd sockets to a specific consumer and domain. This is a
621 * helper function to facilitate sending the information to the consumer for a
624 static int send_consumer_relayd_sockets(int domain
,
625 struct ltt_session
*session
, struct consumer_output
*consumer
,
626 struct consumer_socket
*sock
)
633 /* Sending control relayd socket. */
634 if (!sock
->control_sock_sent
) {
635 ret
= send_consumer_relayd_socket(domain
, session
,
636 &consumer
->dst
.net
.control
, consumer
, sock
);
637 if (ret
!= LTTNG_OK
) {
642 /* Sending data relayd socket. */
643 if (!sock
->data_sock_sent
) {
644 ret
= send_consumer_relayd_socket(domain
, session
,
645 &consumer
->dst
.net
.data
, consumer
, sock
);
646 if (ret
!= LTTNG_OK
) {
656 * Setup relayd connections for a tracing session. First creates the socket to
657 * the relayd and send them to the right domain consumer. Consumer type MUST be
660 int cmd_setup_relayd(struct ltt_session
*session
)
663 struct ltt_ust_session
*usess
;
664 struct ltt_kernel_session
*ksess
;
665 struct consumer_socket
*socket
;
666 struct lttng_ht_iter iter
;
670 usess
= session
->ust_session
;
671 ksess
= session
->kernel_session
;
673 DBG("Setting relayd for session %s", session
->name
);
677 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
678 && usess
->consumer
->enabled
) {
679 /* For each consumer socket, send relayd sockets */
680 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
682 /* Code flow error */
683 assert(socket
->fd
>= 0);
685 pthread_mutex_lock(socket
->lock
);
686 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
,
687 usess
->consumer
, socket
);
688 pthread_mutex_unlock(socket
->lock
);
689 if (ret
!= LTTNG_OK
) {
695 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
696 && ksess
->consumer
->enabled
) {
697 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
699 /* Code flow error */
700 assert(socket
->fd
>= 0);
702 pthread_mutex_lock(socket
->lock
);
703 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
,
704 ksess
->consumer
, socket
);
705 pthread_mutex_unlock(socket
->lock
);
706 if (ret
!= LTTNG_OK
) {
718 * Start a kernel session by opening all necessary streams.
720 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
723 struct ltt_kernel_channel
*kchan
;
725 /* Open kernel metadata */
726 if (ksess
->metadata
== NULL
) {
727 ret
= kernel_open_metadata(ksess
);
729 ret
= LTTNG_ERR_KERN_META_FAIL
;
734 /* Open kernel metadata stream */
735 if (ksess
->metadata_stream_fd
< 0) {
736 ret
= kernel_open_metadata_stream(ksess
);
738 ERR("Kernel create metadata stream failed");
739 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
744 /* For each channel */
745 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
746 if (kchan
->stream_count
== 0) {
747 ret
= kernel_open_channel_stream(kchan
);
749 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
752 /* Update the stream global counter */
753 ksess
->stream_count_global
+= ret
;
757 /* Setup kernel consumer socket and send fds to it */
758 ret
= init_kernel_tracing(ksess
);
760 ret
= LTTNG_ERR_KERN_START_FAIL
;
764 /* This start the kernel tracing */
765 ret
= kernel_start_session(ksess
);
767 ret
= LTTNG_ERR_KERN_START_FAIL
;
771 /* Quiescent wait after starting trace */
772 kernel_wait_quiescent(kernel_tracer_fd
);
783 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
785 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
789 struct ltt_ust_session
*usess
;
791 usess
= session
->ust_session
;
796 case LTTNG_DOMAIN_KERNEL
:
798 ret
= channel_kernel_disable(session
->kernel_session
,
800 if (ret
!= LTTNG_OK
) {
804 kernel_wait_quiescent(kernel_tracer_fd
);
807 case LTTNG_DOMAIN_UST
:
809 struct ltt_ust_channel
*uchan
;
810 struct lttng_ht
*chan_ht
;
812 chan_ht
= usess
->domain_global
.channels
;
814 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
816 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
820 ret
= channel_ust_disable(usess
, uchan
);
821 if (ret
!= LTTNG_OK
) {
827 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
828 case LTTNG_DOMAIN_UST_EXEC_NAME
:
829 case LTTNG_DOMAIN_UST_PID
:
832 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
844 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
846 * The wpipe arguments is used as a notifier for the kernel thread.
848 int cmd_enable_channel(struct ltt_session
*session
,
849 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
852 struct ltt_ust_session
*usess
= session
->ust_session
;
853 struct lttng_ht
*chan_ht
;
859 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
863 switch (domain
->type
) {
864 case LTTNG_DOMAIN_KERNEL
:
866 struct ltt_kernel_channel
*kchan
;
868 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
869 session
->kernel_session
);
871 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
873 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
876 if (ret
!= LTTNG_OK
) {
880 kernel_wait_quiescent(kernel_tracer_fd
);
883 * If the session was previously started, start as well this newly
884 * created kernel session so the events/channels enabled *after* the
885 * start actually work.
887 if (session
->started
&& !session
->kernel_session
->started
) {
888 ret
= start_kernel_session(session
->kernel_session
, wpipe
);
889 if (ret
!= LTTNG_OK
) {
895 case LTTNG_DOMAIN_UST
:
897 struct ltt_ust_channel
*uchan
;
899 chan_ht
= usess
->domain_global
.channels
;
901 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
903 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
905 ret
= channel_ust_enable(usess
, uchan
);
908 /* Start the UST session if the session was already started. */
909 if (session
->started
&& !usess
->start_trace
) {
910 ret
= ust_app_start_trace_all(usess
);
912 ret
= LTTNG_ERR_UST_START_FAIL
;
916 usess
->start_trace
= 1;
921 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
932 * Command LTTNG_DISABLE_EVENT processed by the client thread.
934 int cmd_disable_event(struct ltt_session
*session
, int domain
,
935 char *channel_name
, char *event_name
)
942 case LTTNG_DOMAIN_KERNEL
:
944 struct ltt_kernel_channel
*kchan
;
945 struct ltt_kernel_session
*ksess
;
947 ksess
= session
->kernel_session
;
949 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
951 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
955 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
956 if (ret
!= LTTNG_OK
) {
960 kernel_wait_quiescent(kernel_tracer_fd
);
963 case LTTNG_DOMAIN_UST
:
965 struct ltt_ust_channel
*uchan
;
966 struct ltt_ust_session
*usess
;
968 usess
= session
->ust_session
;
970 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
973 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
977 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
978 if (ret
!= LTTNG_OK
) {
982 DBG3("Disable UST event %s in channel %s completed", event_name
,
987 case LTTNG_DOMAIN_UST_EXEC_NAME
:
988 case LTTNG_DOMAIN_UST_PID
:
989 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1004 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1006 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
1014 case LTTNG_DOMAIN_KERNEL
:
1016 struct ltt_kernel_session
*ksess
;
1017 struct ltt_kernel_channel
*kchan
;
1019 ksess
= session
->kernel_session
;
1021 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1022 if (kchan
== NULL
) {
1023 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1027 ret
= event_kernel_disable_all(kchan
);
1028 if (ret
!= LTTNG_OK
) {
1032 kernel_wait_quiescent(kernel_tracer_fd
);
1035 case LTTNG_DOMAIN_UST
:
1037 struct ltt_ust_session
*usess
;
1038 struct ltt_ust_channel
*uchan
;
1040 usess
= session
->ust_session
;
1042 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1044 if (uchan
== NULL
) {
1045 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1049 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1054 DBG3("Disable all UST events in channel %s completed", channel_name
);
1059 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1060 case LTTNG_DOMAIN_UST_PID
:
1061 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1064 ret
= LTTNG_ERR_UND
;
1076 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1078 int cmd_add_context(struct ltt_session
*session
, int domain
,
1079 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1084 case LTTNG_DOMAIN_KERNEL
:
1085 assert(session
->kernel_session
);
1087 if (session
->kernel_session
->channel_count
== 0) {
1088 /* Create default channel */
1089 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1090 if (ret
!= LTTNG_OK
) {
1095 /* Add kernel context to kernel tracer */
1096 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1097 if (ret
!= LTTNG_OK
) {
1101 case LTTNG_DOMAIN_UST
:
1103 struct ltt_ust_session
*usess
= session
->ust_session
;
1106 unsigned int chan_count
=
1107 lttng_ht_get_count(usess
->domain_global
.channels
);
1108 if (chan_count
== 0) {
1109 struct lttng_channel
*attr
;
1110 /* Create default channel */
1111 attr
= channel_new_default_attr(domain
);
1113 ret
= LTTNG_ERR_FATAL
;
1117 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1118 if (ret
!= LTTNG_OK
) {
1125 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1126 if (ret
!= LTTNG_OK
) {
1132 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1133 case LTTNG_DOMAIN_UST_PID
:
1134 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1137 ret
= LTTNG_ERR_UND
;
1148 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1150 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1151 char *channel_name
, struct lttng_event
*event
,
1152 struct lttng_filter_bytecode
*filter
, int wpipe
)
1154 int ret
, channel_created
= 0;
1155 struct lttng_channel
*attr
;
1159 assert(channel_name
);
1163 switch (domain
->type
) {
1164 case LTTNG_DOMAIN_KERNEL
:
1166 struct ltt_kernel_channel
*kchan
;
1168 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1169 session
->kernel_session
);
1170 if (kchan
== NULL
) {
1171 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
);
1173 ret
= LTTNG_ERR_FATAL
;
1176 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1178 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1179 if (ret
!= LTTNG_OK
) {
1185 channel_created
= 1;
1188 /* Get the newly created kernel channel pointer */
1189 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1190 session
->kernel_session
);
1191 if (kchan
== NULL
) {
1192 /* This sould not happen... */
1193 ret
= LTTNG_ERR_FATAL
;
1197 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1198 if (ret
!= LTTNG_OK
) {
1199 if (channel_created
) {
1200 /* Let's not leak a useless channel. */
1201 kernel_destroy_channel(kchan
);
1206 kernel_wait_quiescent(kernel_tracer_fd
);
1209 case LTTNG_DOMAIN_UST
:
1211 struct ltt_ust_channel
*uchan
;
1212 struct ltt_ust_session
*usess
= session
->ust_session
;
1216 /* Get channel from global UST domain */
1217 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1219 if (uchan
== NULL
) {
1220 /* Create default channel */
1221 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
);
1223 ret
= LTTNG_ERR_FATAL
;
1226 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1228 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1229 if (ret
!= LTTNG_OK
) {
1235 /* Get the newly created channel reference back */
1236 uchan
= trace_ust_find_channel_by_name(
1237 usess
->domain_global
.channels
, channel_name
);
1241 /* At this point, the session and channel exist on the tracer */
1242 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
, filter
);
1243 if (ret
!= LTTNG_OK
) {
1249 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1250 case LTTNG_DOMAIN_UST_PID
:
1251 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1254 ret
= LTTNG_ERR_UND
;
1266 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1268 int cmd_enable_event_all(struct ltt_session
*session
,
1269 struct lttng_domain
*domain
, char *channel_name
, int event_type
,
1270 struct lttng_filter_bytecode
*filter
, int wpipe
)
1273 struct lttng_channel
*attr
;
1276 assert(channel_name
);
1280 switch (domain
->type
) {
1281 case LTTNG_DOMAIN_KERNEL
:
1283 struct ltt_kernel_channel
*kchan
;
1285 assert(session
->kernel_session
);
1287 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1288 session
->kernel_session
);
1289 if (kchan
== NULL
) {
1290 /* Create default channel */
1291 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
);
1293 ret
= LTTNG_ERR_FATAL
;
1296 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1298 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1299 if (ret
!= LTTNG_OK
) {
1305 /* Get the newly created kernel channel pointer */
1306 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1307 session
->kernel_session
);
1311 switch (event_type
) {
1312 case LTTNG_EVENT_SYSCALL
:
1313 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1315 case LTTNG_EVENT_TRACEPOINT
:
1317 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1318 * events already registered to the channel.
1320 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1322 case LTTNG_EVENT_ALL
:
1323 /* Enable syscalls and tracepoints */
1324 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1327 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1331 /* Manage return value */
1332 if (ret
!= LTTNG_OK
) {
1334 * On error, cmd_enable_channel call will take care of destroying
1335 * the created channel if it was needed.
1340 kernel_wait_quiescent(kernel_tracer_fd
);
1343 case LTTNG_DOMAIN_UST
:
1345 struct ltt_ust_channel
*uchan
;
1346 struct ltt_ust_session
*usess
= session
->ust_session
;
1350 /* Get channel from global UST domain */
1351 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1353 if (uchan
== NULL
) {
1354 /* Create default channel */
1355 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
);
1357 ret
= LTTNG_ERR_FATAL
;
1360 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1362 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1363 if (ret
!= LTTNG_OK
) {
1369 /* Get the newly created channel reference back */
1370 uchan
= trace_ust_find_channel_by_name(
1371 usess
->domain_global
.channels
, channel_name
);
1375 /* At this point, the session and channel exist on the tracer */
1377 switch (event_type
) {
1378 case LTTNG_EVENT_ALL
:
1379 case LTTNG_EVENT_TRACEPOINT
:
1380 ret
= event_ust_enable_all_tracepoints(usess
, uchan
, filter
);
1381 if (ret
!= LTTNG_OK
) {
1386 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1390 /* Manage return value */
1391 if (ret
!= LTTNG_OK
) {
1398 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1399 case LTTNG_DOMAIN_UST_PID
:
1400 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1403 ret
= LTTNG_ERR_UND
;
1416 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1418 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1421 ssize_t nb_events
= 0;
1424 case LTTNG_DOMAIN_KERNEL
:
1425 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1426 if (nb_events
< 0) {
1427 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1431 case LTTNG_DOMAIN_UST
:
1432 nb_events
= ust_app_list_events(events
);
1433 if (nb_events
< 0) {
1434 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1439 ret
= LTTNG_ERR_UND
;
1446 /* Return negative value to differentiate return code */
1451 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1453 ssize_t
cmd_list_tracepoint_fields(int domain
,
1454 struct lttng_event_field
**fields
)
1457 ssize_t nb_fields
= 0;
1460 case LTTNG_DOMAIN_UST
:
1461 nb_fields
= ust_app_list_event_fields(fields
);
1462 if (nb_fields
< 0) {
1463 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1467 case LTTNG_DOMAIN_KERNEL
:
1468 default: /* fall-through */
1469 ret
= LTTNG_ERR_UND
;
1476 /* Return negative value to differentiate return code */
1481 * Command LTTNG_START_TRACE processed by the client thread.
1483 int cmd_start_trace(struct ltt_session
*session
)
1486 struct ltt_kernel_session
*ksession
;
1487 struct ltt_ust_session
*usess
;
1491 /* Ease our life a bit ;) */
1492 ksession
= session
->kernel_session
;
1493 usess
= session
->ust_session
;
1495 if (session
->enabled
) {
1496 /* Already started. */
1497 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1501 session
->enabled
= 1;
1503 /* Kernel tracing */
1504 if (ksession
!= NULL
) {
1505 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1506 if (ret
!= LTTNG_OK
) {
1511 /* Flag session that trace should start automatically */
1513 usess
->start_trace
= 1;
1515 ret
= ust_app_start_trace_all(usess
);
1517 ret
= LTTNG_ERR_UST_START_FAIL
;
1522 session
->started
= 1;
1531 * Command LTTNG_STOP_TRACE processed by the client thread.
1533 int cmd_stop_trace(struct ltt_session
*session
)
1536 struct ltt_kernel_channel
*kchan
;
1537 struct ltt_kernel_session
*ksession
;
1538 struct ltt_ust_session
*usess
;
1543 ksession
= session
->kernel_session
;
1544 usess
= session
->ust_session
;
1546 if (!session
->enabled
) {
1547 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1551 session
->enabled
= 0;
1555 DBG("Stop kernel tracing");
1557 /* Flush metadata if exist */
1558 if (ksession
->metadata_stream_fd
>= 0) {
1559 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1561 ERR("Kernel metadata flush failed");
1565 /* Flush all buffers before stopping */
1566 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1567 ret
= kernel_flush_buffer(kchan
);
1569 ERR("Kernel flush buffer error");
1573 ret
= kernel_stop_session(ksession
);
1575 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1579 kernel_wait_quiescent(kernel_tracer_fd
);
1581 ksession
->started
= 0;
1585 usess
->start_trace
= 0;
1587 ret
= ust_app_stop_trace_all(usess
);
1589 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1594 session
->started
= 0;
1603 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1605 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1606 size_t nb_uri
, struct lttng_uri
*uris
)
1609 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1610 struct ltt_ust_session
*usess
= session
->ust_session
;
1611 struct consumer_output
*consumer
= NULL
;
1617 /* Can't enable consumer after session started. */
1618 if (session
->enabled
) {
1619 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1624 * This case switch makes sure the domain session has a temporary consumer
1625 * so the URL can be set.
1629 /* Code flow error. A session MUST always have a consumer object */
1630 assert(session
->consumer
);
1632 * The URL will be added to the tracing session consumer instead of a
1633 * specific domain consumer.
1635 consumer
= session
->consumer
;
1637 case LTTNG_DOMAIN_KERNEL
:
1638 /* Code flow error if we don't have a kernel session here. */
1640 assert(ksess
->consumer
);
1641 consumer
= ksess
->consumer
;
1643 case LTTNG_DOMAIN_UST
:
1644 /* Code flow error if we don't have a kernel session here. */
1646 assert(usess
->consumer
);
1647 consumer
= usess
->consumer
;
1651 for (i
= 0; i
< nb_uri
; i
++) {
1652 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1666 * Command LTTNG_CREATE_SESSION processed by the client thread.
1668 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1669 size_t nb_uri
, lttng_sock_cred
*creds
)
1673 struct ltt_session
*session
;
1677 /* No URIs is not possible. */
1679 ret
= LTTNG_ERR_SESSION_FAIL
;
1684 * Verify if the session already exist
1686 * XXX: There is no need for the session lock list here since the caller
1687 * (process_client_msg) is holding it. We might want to change that so a
1688 * single command does not lock the entire session list.
1690 session
= session_find_by_name(name
);
1691 if (session
!= NULL
) {
1692 ret
= LTTNG_ERR_EXIST_SESS
;
1696 /* Create tracing session in the registry */
1697 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
1698 LTTNG_SOCK_GET_GID_CRED(creds
));
1699 if (ret
!= LTTNG_OK
) {
1704 * Get the newly created session pointer back
1706 * XXX: There is no need for the session lock list here since the caller
1707 * (process_client_msg) is holding it. We might want to change that so a
1708 * single command does not lock the entire session list.
1710 session
= session_find_by_name(name
);
1713 /* Create default consumer output for the session not yet created. */
1714 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1715 if (session
->consumer
== NULL
) {
1716 ret
= LTTNG_ERR_FATAL
;
1717 goto consumer_error
;
1720 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1721 if (ret
!= LTTNG_OK
) {
1722 goto consumer_error
;
1725 session
->consumer
->enabled
= 1;
1730 session_destroy(session
);
1737 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1739 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1742 struct ltt_ust_session
*usess
;
1743 struct ltt_kernel_session
*ksess
;
1748 usess
= session
->ust_session
;
1749 ksess
= session
->kernel_session
;
1751 /* Clean kernel session teardown */
1752 kernel_destroy_session(ksess
);
1754 /* UST session teardown */
1756 /* Close any relayd session */
1757 consumer_output_send_destroy_relayd(usess
->consumer
);
1759 /* Destroy every UST application related to this session. */
1760 ret
= ust_app_destroy_trace_all(usess
);
1762 ERR("Error in ust_app_destroy_trace_all");
1765 /* Clean up the rest. */
1766 trace_ust_destroy_session(usess
);
1770 * Must notify the kernel thread here to update it's poll set in order to
1771 * remove the channel(s)' fd just destroyed.
1773 ret
= notify_thread_pipe(wpipe
);
1775 PERROR("write kernel poll pipe");
1778 ret
= session_destroy(session
);
1784 * Command LTTNG_CALIBRATE processed by the client thread.
1786 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1791 case LTTNG_DOMAIN_KERNEL
:
1793 struct lttng_kernel_calibrate kcalibrate
;
1795 kcalibrate
.type
= calibrate
->type
;
1796 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1798 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1803 case LTTNG_DOMAIN_UST
:
1805 struct lttng_ust_calibrate ucalibrate
;
1807 ucalibrate
.type
= calibrate
->type
;
1808 ret
= ust_app_calibrate_glb(&ucalibrate
);
1810 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1816 ret
= LTTNG_ERR_UND
;
1827 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1829 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1830 const char *sock_path
, struct consumer_data
*cdata
)
1833 struct consumer_socket
*socket
;
1840 case LTTNG_DOMAIN_KERNEL
:
1842 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1846 /* Can't register a consumer if there is already one */
1847 if (ksess
->consumer_fds_sent
!= 0) {
1848 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1852 sock
= lttcomm_connect_unix_sock(sock_path
);
1854 ret
= LTTNG_ERR_CONNECT_FAIL
;
1858 socket
= consumer_allocate_socket(sock
);
1859 if (socket
== NULL
) {
1862 PERROR("close register consumer");
1864 ret
= LTTNG_ERR_FATAL
;
1868 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1869 if (socket
->lock
== NULL
) {
1870 PERROR("zmalloc pthread mutex");
1871 ret
= LTTNG_ERR_FATAL
;
1874 pthread_mutex_init(socket
->lock
, NULL
);
1875 socket
->registered
= 1;
1878 consumer_add_socket(socket
, ksess
->consumer
);
1881 pthread_mutex_lock(&cdata
->pid_mutex
);
1883 pthread_mutex_unlock(&cdata
->pid_mutex
);
1888 /* TODO: Userspace tracing */
1889 ret
= LTTNG_ERR_UND
;
1900 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1902 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1903 struct lttng_domain
**domains
)
1908 if (session
->kernel_session
!= NULL
) {
1909 DBG3("Listing domains found kernel domain");
1913 if (session
->ust_session
!= NULL
) {
1914 DBG3("Listing domains found UST global domain");
1918 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1919 if (*domains
== NULL
) {
1920 ret
= LTTNG_ERR_FATAL
;
1924 if (session
->kernel_session
!= NULL
) {
1925 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1929 if (session
->ust_session
!= NULL
) {
1930 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1937 /* Return negative value to differentiate return code */
1943 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1945 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1946 struct lttng_channel
**channels
)
1949 ssize_t nb_chan
= 0;
1952 case LTTNG_DOMAIN_KERNEL
:
1953 if (session
->kernel_session
!= NULL
) {
1954 nb_chan
= session
->kernel_session
->channel_count
;
1956 DBG3("Number of kernel channels %zd", nb_chan
);
1958 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1961 case LTTNG_DOMAIN_UST
:
1962 if (session
->ust_session
!= NULL
) {
1963 nb_chan
= lttng_ht_get_count(
1964 session
->ust_session
->domain_global
.channels
);
1966 DBG3("Number of UST global channels %zd", nb_chan
);
1968 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1973 ret
= LTTNG_ERR_UND
;
1978 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
1979 if (*channels
== NULL
) {
1980 ret
= LTTNG_ERR_FATAL
;
1984 list_lttng_channels(domain
, session
, *channels
);
1987 /* Ret value was set in the domain switch case */
1994 /* Return negative value to differentiate return code */
1999 * Command LTTNG_LIST_EVENTS processed by the client thread.
2001 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2002 char *channel_name
, struct lttng_event
**events
)
2005 ssize_t nb_event
= 0;
2008 case LTTNG_DOMAIN_KERNEL
:
2009 if (session
->kernel_session
!= NULL
) {
2010 nb_event
= list_lttng_kernel_events(channel_name
,
2011 session
->kernel_session
, events
);
2014 case LTTNG_DOMAIN_UST
:
2016 if (session
->ust_session
!= NULL
) {
2017 nb_event
= list_lttng_ust_global_events(channel_name
,
2018 &session
->ust_session
->domain_global
, events
);
2023 ret
= LTTNG_ERR_UND
;
2030 /* Return negative value to differentiate return code */
2035 * Using the session list, filled a lttng_session array to send back to the
2036 * client for session listing.
2038 * The session list lock MUST be acquired before calling this function. Use
2039 * session_lock_list() and session_unlock_list().
2041 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2046 struct ltt_session
*session
;
2047 struct ltt_session_list
*list
= session_get_list();
2049 DBG("Getting all available session for UID %d GID %d",
2052 * Iterate over session list and append data after the control struct in
2055 cds_list_for_each_entry(session
, &list
->head
, list
) {
2057 * Only list the sessions the user can control.
2059 if (!session_access_ok(session
, uid
, gid
)) {
2063 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2064 struct ltt_ust_session
*usess
= session
->ust_session
;
2066 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2067 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2068 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2069 ret
= build_network_session_path(sessions
[i
].path
,
2070 sizeof(session
[i
].path
), session
);
2072 ret
= snprintf(sessions
[i
].path
, sizeof(session
[i
].path
), "%s",
2073 session
->consumer
->dst
.trace_path
);
2076 PERROR("snprintf session path");
2080 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2081 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2082 sessions
[i
].enabled
= session
->enabled
;
2088 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2089 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2091 int cmd_data_pending(struct ltt_session
*session
)
2094 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2095 struct ltt_ust_session
*usess
= session
->ust_session
;
2099 /* Session MUST be stopped to ask for data availability. */
2100 if (session
->enabled
) {
2101 ret
= LTTNG_ERR_SESSION_STARTED
;
2105 if (ksess
&& ksess
->consumer
) {
2106 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2108 /* Data is still being extracted for the kernel. */
2113 if (usess
&& usess
->consumer
) {
2114 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2116 /* Data is still being extracted for the kernel. */
2121 /* Data is ready to be read by a viewer */
2129 * Init command subsystem.
2134 * Set network sequence index to 1 for streams to match a relayd
2135 * socket on the consumer side.
2137 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
2138 relayd_net_seq_idx
= 1;
2139 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
2141 DBG("Command subsystem initialized");