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>
32 #include "kernel-consumer.h"
33 #include "lttng-sessiond.h"
39 * Used to keep a unique index for each relayd socket created where this value
40 * is associated with streams on the consumer so it can match the right relayd
43 * This value should be incremented atomically for safety purposes and future
44 * possible concurrent access.
46 static unsigned int 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
== -1) {
571 * Increment net_seq_idx because we are about to transfer the
572 * new relayd socket to the consumer.
574 uatomic_inc(&relayd_net_seq_idx
);
575 /* Assign unique key so the consumer can match streams */
576 uatomic_set(&consumer
->net_seq_index
,
577 uatomic_read(&relayd_net_seq_idx
));
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
, domain
, 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 int domain
, struct lttng_channel
*attr
, int wpipe
)
852 struct ltt_ust_session
*usess
= session
->ust_session
;
853 struct lttng_ht
*chan_ht
;
858 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
863 case LTTNG_DOMAIN_KERNEL
:
865 struct ltt_kernel_channel
*kchan
;
867 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
868 session
->kernel_session
);
870 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
872 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
875 if (ret
!= LTTNG_OK
) {
879 kernel_wait_quiescent(kernel_tracer_fd
);
882 * If the session was previously started, start as well this newly
883 * created kernel session so the events/channels enabled *after* the
884 * start actually work.
886 if (session
->started
&& !session
->kernel_session
->started
) {
887 ret
= start_kernel_session(session
->kernel_session
, wpipe
);
888 if (ret
!= LTTNG_OK
) {
894 case LTTNG_DOMAIN_UST
:
896 struct ltt_ust_channel
*uchan
;
898 chan_ht
= usess
->domain_global
.channels
;
900 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
902 ret
= channel_ust_create(usess
, domain
, attr
);
904 ret
= channel_ust_enable(usess
, domain
, uchan
);
907 /* Start the UST session if the session was already started. */
908 if (session
->started
&& !usess
->start_trace
) {
909 ret
= ust_app_start_trace_all(usess
);
911 ret
= LTTNG_ERR_UST_START_FAIL
;
915 usess
->start_trace
= 1;
920 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
921 case LTTNG_DOMAIN_UST_EXEC_NAME
:
922 case LTTNG_DOMAIN_UST_PID
:
925 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
936 * Command LTTNG_DISABLE_EVENT processed by the client thread.
938 int cmd_disable_event(struct ltt_session
*session
, int domain
,
939 char *channel_name
, char *event_name
)
946 case LTTNG_DOMAIN_KERNEL
:
948 struct ltt_kernel_channel
*kchan
;
949 struct ltt_kernel_session
*ksess
;
951 ksess
= session
->kernel_session
;
953 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
955 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
959 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
960 if (ret
!= LTTNG_OK
) {
964 kernel_wait_quiescent(kernel_tracer_fd
);
967 case LTTNG_DOMAIN_UST
:
969 struct ltt_ust_channel
*uchan
;
970 struct ltt_ust_session
*usess
;
972 usess
= session
->ust_session
;
974 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
977 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
981 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
982 if (ret
!= LTTNG_OK
) {
986 DBG3("Disable UST event %s in channel %s completed", event_name
,
991 case LTTNG_DOMAIN_UST_EXEC_NAME
:
992 case LTTNG_DOMAIN_UST_PID
:
993 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1008 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1010 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
1018 case LTTNG_DOMAIN_KERNEL
:
1020 struct ltt_kernel_session
*ksess
;
1021 struct ltt_kernel_channel
*kchan
;
1023 ksess
= session
->kernel_session
;
1025 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1026 if (kchan
== NULL
) {
1027 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1031 ret
= event_kernel_disable_all(kchan
);
1032 if (ret
!= LTTNG_OK
) {
1036 kernel_wait_quiescent(kernel_tracer_fd
);
1039 case LTTNG_DOMAIN_UST
:
1041 struct ltt_ust_session
*usess
;
1042 struct ltt_ust_channel
*uchan
;
1044 usess
= session
->ust_session
;
1046 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1048 if (uchan
== NULL
) {
1049 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1053 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
1058 DBG3("Disable all UST events in channel %s completed", channel_name
);
1063 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1064 case LTTNG_DOMAIN_UST_PID
:
1065 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1068 ret
= LTTNG_ERR_UND
;
1080 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1082 int cmd_add_context(struct ltt_session
*session
, int domain
,
1083 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1088 case LTTNG_DOMAIN_KERNEL
:
1089 assert(session
->kernel_session
);
1091 if (session
->kernel_session
->channel_count
== 0) {
1092 /* Create default channel */
1093 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1094 if (ret
!= LTTNG_OK
) {
1099 /* Add kernel context to kernel tracer */
1100 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1101 if (ret
!= LTTNG_OK
) {
1105 case LTTNG_DOMAIN_UST
:
1107 struct ltt_ust_session
*usess
= session
->ust_session
;
1110 unsigned int chan_count
=
1111 lttng_ht_get_count(usess
->domain_global
.channels
);
1112 if (chan_count
== 0) {
1113 struct lttng_channel
*attr
;
1114 /* Create default channel */
1115 attr
= channel_new_default_attr(domain
);
1117 ret
= LTTNG_ERR_FATAL
;
1121 ret
= channel_ust_create(usess
, domain
, attr
);
1122 if (ret
!= LTTNG_OK
) {
1129 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1130 if (ret
!= LTTNG_OK
) {
1136 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1137 case LTTNG_DOMAIN_UST_PID
:
1138 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1141 ret
= LTTNG_ERR_UND
;
1152 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1154 int cmd_enable_event(struct ltt_session
*session
, int domain
,
1155 char *channel_name
, struct lttng_event
*event
,
1156 struct lttng_filter_bytecode
*filter
, int wpipe
)
1158 int ret
, channel_created
= 0;
1159 struct lttng_channel
*attr
;
1163 assert(channel_name
);
1168 case LTTNG_DOMAIN_KERNEL
:
1170 struct ltt_kernel_channel
*kchan
;
1172 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1173 session
->kernel_session
);
1174 if (kchan
== NULL
) {
1175 attr
= channel_new_default_attr(domain
);
1177 ret
= LTTNG_ERR_FATAL
;
1180 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1182 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1183 if (ret
!= LTTNG_OK
) {
1189 channel_created
= 1;
1192 /* Get the newly created kernel channel pointer */
1193 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1194 session
->kernel_session
);
1195 if (kchan
== NULL
) {
1196 /* This sould not happen... */
1197 ret
= LTTNG_ERR_FATAL
;
1201 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1202 if (ret
!= LTTNG_OK
) {
1203 if (channel_created
) {
1204 /* Let's not leak a useless channel. */
1205 kernel_destroy_channel(kchan
);
1210 kernel_wait_quiescent(kernel_tracer_fd
);
1213 case LTTNG_DOMAIN_UST
:
1215 struct ltt_ust_channel
*uchan
;
1216 struct ltt_ust_session
*usess
= session
->ust_session
;
1220 /* Get channel from global UST domain */
1221 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1223 if (uchan
== NULL
) {
1224 /* Create default channel */
1225 attr
= channel_new_default_attr(domain
);
1227 ret
= LTTNG_ERR_FATAL
;
1230 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1232 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1233 if (ret
!= LTTNG_OK
) {
1239 /* Get the newly created channel reference back */
1240 uchan
= trace_ust_find_channel_by_name(
1241 usess
->domain_global
.channels
, channel_name
);
1245 /* At this point, the session and channel exist on the tracer */
1246 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
, filter
);
1247 if (ret
!= LTTNG_OK
) {
1253 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1254 case LTTNG_DOMAIN_UST_PID
:
1255 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1258 ret
= LTTNG_ERR_UND
;
1270 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1272 int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
1273 char *channel_name
, int event_type
,
1274 struct lttng_filter_bytecode
*filter
, int wpipe
)
1277 struct lttng_channel
*attr
;
1280 assert(channel_name
);
1285 case LTTNG_DOMAIN_KERNEL
:
1287 struct ltt_kernel_channel
*kchan
;
1289 assert(session
->kernel_session
);
1291 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1292 session
->kernel_session
);
1293 if (kchan
== NULL
) {
1294 /* Create default channel */
1295 attr
= channel_new_default_attr(domain
);
1297 ret
= LTTNG_ERR_FATAL
;
1300 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1302 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1303 if (ret
!= LTTNG_OK
) {
1309 /* Get the newly created kernel channel pointer */
1310 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1311 session
->kernel_session
);
1315 switch (event_type
) {
1316 case LTTNG_EVENT_SYSCALL
:
1317 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1319 case LTTNG_EVENT_TRACEPOINT
:
1321 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1322 * events already registered to the channel.
1324 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1326 case LTTNG_EVENT_ALL
:
1327 /* Enable syscalls and tracepoints */
1328 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1331 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1335 /* Manage return value */
1336 if (ret
!= LTTNG_OK
) {
1338 * On error, cmd_enable_channel call will take care of destroying
1339 * the created channel if it was needed.
1344 kernel_wait_quiescent(kernel_tracer_fd
);
1347 case LTTNG_DOMAIN_UST
:
1349 struct ltt_ust_channel
*uchan
;
1350 struct ltt_ust_session
*usess
= session
->ust_session
;
1354 /* Get channel from global UST domain */
1355 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1357 if (uchan
== NULL
) {
1358 /* Create default channel */
1359 attr
= channel_new_default_attr(domain
);
1361 ret
= LTTNG_ERR_FATAL
;
1364 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1366 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1367 if (ret
!= LTTNG_OK
) {
1373 /* Get the newly created channel reference back */
1374 uchan
= trace_ust_find_channel_by_name(
1375 usess
->domain_global
.channels
, channel_name
);
1379 /* At this point, the session and channel exist on the tracer */
1381 switch (event_type
) {
1382 case LTTNG_EVENT_ALL
:
1383 case LTTNG_EVENT_TRACEPOINT
:
1384 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
,
1386 if (ret
!= LTTNG_OK
) {
1391 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1395 /* Manage return value */
1396 if (ret
!= LTTNG_OK
) {
1403 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1404 case LTTNG_DOMAIN_UST_PID
:
1405 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1408 ret
= LTTNG_ERR_UND
;
1421 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1423 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1426 ssize_t nb_events
= 0;
1429 case LTTNG_DOMAIN_KERNEL
:
1430 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1431 if (nb_events
< 0) {
1432 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1436 case LTTNG_DOMAIN_UST
:
1437 nb_events
= ust_app_list_events(events
);
1438 if (nb_events
< 0) {
1439 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1444 ret
= LTTNG_ERR_UND
;
1451 /* Return negative value to differentiate return code */
1456 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1458 ssize_t
cmd_list_tracepoint_fields(int domain
,
1459 struct lttng_event_field
**fields
)
1462 ssize_t nb_fields
= 0;
1465 case LTTNG_DOMAIN_UST
:
1466 nb_fields
= ust_app_list_event_fields(fields
);
1467 if (nb_fields
< 0) {
1468 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1472 case LTTNG_DOMAIN_KERNEL
:
1473 default: /* fall-through */
1474 ret
= LTTNG_ERR_UND
;
1481 /* Return negative value to differentiate return code */
1486 * Command LTTNG_START_TRACE processed by the client thread.
1488 int cmd_start_trace(struct ltt_session
*session
)
1491 struct ltt_kernel_session
*ksession
;
1492 struct ltt_ust_session
*usess
;
1496 /* Ease our life a bit ;) */
1497 ksession
= session
->kernel_session
;
1498 usess
= session
->ust_session
;
1500 if (session
->enabled
) {
1501 /* Already started. */
1502 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1506 session
->enabled
= 1;
1508 /* Kernel tracing */
1509 if (ksession
!= NULL
) {
1510 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1511 if (ret
!= LTTNG_OK
) {
1516 /* Flag session that trace should start automatically */
1518 usess
->start_trace
= 1;
1520 ret
= ust_app_start_trace_all(usess
);
1522 ret
= LTTNG_ERR_UST_START_FAIL
;
1527 session
->started
= 1;
1536 * Command LTTNG_STOP_TRACE processed by the client thread.
1538 int cmd_stop_trace(struct ltt_session
*session
)
1541 struct ltt_kernel_channel
*kchan
;
1542 struct ltt_kernel_session
*ksession
;
1543 struct ltt_ust_session
*usess
;
1548 ksession
= session
->kernel_session
;
1549 usess
= session
->ust_session
;
1551 if (!session
->enabled
) {
1552 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1556 session
->enabled
= 0;
1560 DBG("Stop kernel tracing");
1562 /* Flush metadata if exist */
1563 if (ksession
->metadata_stream_fd
>= 0) {
1564 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1566 ERR("Kernel metadata flush failed");
1570 /* Flush all buffers before stopping */
1571 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1572 ret
= kernel_flush_buffer(kchan
);
1574 ERR("Kernel flush buffer error");
1578 ret
= kernel_stop_session(ksession
);
1580 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1584 kernel_wait_quiescent(kernel_tracer_fd
);
1586 ksession
->started
= 0;
1590 usess
->start_trace
= 0;
1592 ret
= ust_app_stop_trace_all(usess
);
1594 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1599 session
->started
= 0;
1608 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1610 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1611 size_t nb_uri
, struct lttng_uri
*uris
)
1614 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1615 struct ltt_ust_session
*usess
= session
->ust_session
;
1616 struct consumer_output
*consumer
= NULL
;
1622 /* Can't enable consumer after session started. */
1623 if (session
->enabled
) {
1624 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1629 * This case switch makes sure the domain session has a temporary consumer
1630 * so the URL can be set.
1634 /* Code flow error. A session MUST always have a consumer object */
1635 assert(session
->consumer
);
1637 * The URL will be added to the tracing session consumer instead of a
1638 * specific domain consumer.
1640 consumer
= session
->consumer
;
1642 case LTTNG_DOMAIN_KERNEL
:
1643 /* Code flow error if we don't have a kernel session here. */
1645 assert(ksess
->consumer
);
1646 consumer
= ksess
->consumer
;
1648 case LTTNG_DOMAIN_UST
:
1649 /* Code flow error if we don't have a kernel session here. */
1651 assert(usess
->consumer
);
1652 consumer
= usess
->consumer
;
1656 for (i
= 0; i
< nb_uri
; i
++) {
1657 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1671 * Command LTTNG_CREATE_SESSION processed by the client thread.
1673 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1674 size_t nb_uri
, lttng_sock_cred
*creds
)
1678 struct ltt_session
*session
;
1682 /* No URIs is not possible. */
1684 ret
= LTTNG_ERR_SESSION_FAIL
;
1689 * Verify if the session already exist
1691 * XXX: There is no need for the session lock list here since the caller
1692 * (process_client_msg) is holding it. We might want to change that so a
1693 * single command does not lock the entire session list.
1695 session
= session_find_by_name(name
);
1696 if (session
!= NULL
) {
1697 ret
= LTTNG_ERR_EXIST_SESS
;
1701 /* Create tracing session in the registry */
1702 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
1703 LTTNG_SOCK_GET_GID_CRED(creds
));
1704 if (ret
!= LTTNG_OK
) {
1709 * Get the newly created session pointer back
1711 * XXX: There is no need for the session lock list here since the caller
1712 * (process_client_msg) is holding it. We might want to change that so a
1713 * single command does not lock the entire session list.
1715 session
= session_find_by_name(name
);
1718 /* Create default consumer output for the session not yet created. */
1719 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1720 if (session
->consumer
== NULL
) {
1721 ret
= LTTNG_ERR_FATAL
;
1722 goto consumer_error
;
1725 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1726 if (ret
!= LTTNG_OK
) {
1727 goto consumer_error
;
1730 session
->consumer
->enabled
= 1;
1735 session_destroy(session
);
1742 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1744 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1747 struct ltt_ust_session
*usess
;
1748 struct ltt_kernel_session
*ksess
;
1753 usess
= session
->ust_session
;
1754 ksess
= session
->kernel_session
;
1756 /* Clean kernel session teardown */
1757 kernel_destroy_session(ksess
);
1759 /* UST session teardown */
1761 /* Close any relayd session */
1762 consumer_output_send_destroy_relayd(usess
->consumer
);
1764 /* Destroy every UST application related to this session. */
1765 ret
= ust_app_destroy_trace_all(usess
);
1767 ERR("Error in ust_app_destroy_trace_all");
1770 /* Clean up the rest. */
1771 trace_ust_destroy_session(usess
);
1775 * Must notify the kernel thread here to update it's poll set in order to
1776 * remove the channel(s)' fd just destroyed.
1778 ret
= notify_thread_pipe(wpipe
);
1780 PERROR("write kernel poll pipe");
1783 ret
= session_destroy(session
);
1789 * Command LTTNG_CALIBRATE processed by the client thread.
1791 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1796 case LTTNG_DOMAIN_KERNEL
:
1798 struct lttng_kernel_calibrate kcalibrate
;
1800 kcalibrate
.type
= calibrate
->type
;
1801 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1803 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1808 case LTTNG_DOMAIN_UST
:
1810 struct lttng_ust_calibrate ucalibrate
;
1812 ucalibrate
.type
= calibrate
->type
;
1813 ret
= ust_app_calibrate_glb(&ucalibrate
);
1815 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1821 ret
= LTTNG_ERR_UND
;
1832 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1834 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1835 const char *sock_path
, struct consumer_data
*cdata
)
1838 struct consumer_socket
*socket
;
1845 case LTTNG_DOMAIN_KERNEL
:
1847 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1851 /* Can't register a consumer if there is already one */
1852 if (ksess
->consumer_fds_sent
!= 0) {
1853 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1857 sock
= lttcomm_connect_unix_sock(sock_path
);
1859 ret
= LTTNG_ERR_CONNECT_FAIL
;
1863 socket
= consumer_allocate_socket(sock
);
1864 if (socket
== NULL
) {
1867 PERROR("close register consumer");
1869 ret
= LTTNG_ERR_FATAL
;
1873 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1874 if (socket
->lock
== NULL
) {
1875 PERROR("zmalloc pthread mutex");
1876 ret
= LTTNG_ERR_FATAL
;
1879 pthread_mutex_init(socket
->lock
, NULL
);
1880 socket
->registered
= 1;
1883 consumer_add_socket(socket
, ksess
->consumer
);
1886 pthread_mutex_lock(&cdata
->pid_mutex
);
1888 pthread_mutex_unlock(&cdata
->pid_mutex
);
1893 /* TODO: Userspace tracing */
1894 ret
= LTTNG_ERR_UND
;
1905 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1907 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1908 struct lttng_domain
**domains
)
1913 if (session
->kernel_session
!= NULL
) {
1914 DBG3("Listing domains found kernel domain");
1918 if (session
->ust_session
!= NULL
) {
1919 DBG3("Listing domains found UST global domain");
1923 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1924 if (*domains
== NULL
) {
1925 ret
= LTTNG_ERR_FATAL
;
1929 if (session
->kernel_session
!= NULL
) {
1930 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1934 if (session
->ust_session
!= NULL
) {
1935 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1942 /* Return negative value to differentiate return code */
1948 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1950 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1951 struct lttng_channel
**channels
)
1954 ssize_t nb_chan
= 0;
1957 case LTTNG_DOMAIN_KERNEL
:
1958 if (session
->kernel_session
!= NULL
) {
1959 nb_chan
= session
->kernel_session
->channel_count
;
1961 DBG3("Number of kernel channels %zd", nb_chan
);
1963 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1966 case LTTNG_DOMAIN_UST
:
1967 if (session
->ust_session
!= NULL
) {
1968 nb_chan
= lttng_ht_get_count(
1969 session
->ust_session
->domain_global
.channels
);
1971 DBG3("Number of UST global channels %zd", nb_chan
);
1973 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1978 ret
= LTTNG_ERR_UND
;
1983 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
1984 if (*channels
== NULL
) {
1985 ret
= LTTNG_ERR_FATAL
;
1989 list_lttng_channels(domain
, session
, *channels
);
1992 /* Ret value was set in the domain switch case */
1999 /* Return negative value to differentiate return code */
2004 * Command LTTNG_LIST_EVENTS processed by the client thread.
2006 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2007 char *channel_name
, struct lttng_event
**events
)
2010 ssize_t nb_event
= 0;
2013 case LTTNG_DOMAIN_KERNEL
:
2014 if (session
->kernel_session
!= NULL
) {
2015 nb_event
= list_lttng_kernel_events(channel_name
,
2016 session
->kernel_session
, events
);
2019 case LTTNG_DOMAIN_UST
:
2021 if (session
->ust_session
!= NULL
) {
2022 nb_event
= list_lttng_ust_global_events(channel_name
,
2023 &session
->ust_session
->domain_global
, events
);
2028 ret
= LTTNG_ERR_UND
;
2035 /* Return negative value to differentiate return code */
2040 * Using the session list, filled a lttng_session array to send back to the
2041 * client for session listing.
2043 * The session list lock MUST be acquired before calling this function. Use
2044 * session_lock_list() and session_unlock_list().
2046 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2051 struct ltt_session
*session
;
2052 struct ltt_session_list
*list
= session_get_list();
2054 DBG("Getting all available session for UID %d GID %d",
2057 * Iterate over session list and append data after the control struct in
2060 cds_list_for_each_entry(session
, &list
->head
, list
) {
2062 * Only list the sessions the user can control.
2064 if (!session_access_ok(session
, uid
, gid
)) {
2068 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2069 struct ltt_ust_session
*usess
= session
->ust_session
;
2071 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2072 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2073 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2074 ret
= build_network_session_path(sessions
[i
].path
,
2075 sizeof(session
[i
].path
), session
);
2077 ret
= snprintf(sessions
[i
].path
, sizeof(session
[i
].path
), "%s",
2078 session
->consumer
->dst
.trace_path
);
2081 PERROR("snprintf session path");
2085 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2086 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2087 sessions
[i
].enabled
= session
->enabled
;
2093 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2094 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2096 int cmd_data_pending(struct ltt_session
*session
)
2099 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2100 struct ltt_ust_session
*usess
= session
->ust_session
;
2104 /* Session MUST be stopped to ask for data availability. */
2105 if (session
->enabled
) {
2106 ret
= LTTNG_ERR_SESSION_STARTED
;
2110 if (ksess
&& ksess
->consumer
) {
2111 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2113 /* Data is still being extracted for the kernel. */
2118 if (usess
&& usess
->consumer
) {
2119 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2121 /* Data is still being extracted for the kernel. */
2126 /* Data is ready to be read by a viewer */
2134 * Init command subsystem.
2139 * Set network sequence index to 1 for streams to match a relayd socket on
2140 * the consumer side.
2142 uatomic_set(&relayd_net_seq_idx
, 1);
2144 DBG("Command subsystem initialized");