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 (strlen(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 /* Set URI into consumer output object */
380 ret
= consumer_set_network_uri(consumer
, uri
);
382 ret
= LTTNG_ERR_FATAL
;
384 } else if (ret
== 1) {
386 * URI was the same in the consumer so we do not append the subdir
387 * again so to not duplicate output dir.
392 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
393 ret
= consumer_set_subdir(consumer
, session_name
);
395 ret
= LTTNG_ERR_FATAL
;
400 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
401 /* On a new subdir, reappend the default trace dir. */
402 strncat(consumer
->subdir
, default_trace_dir
,
403 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
404 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
409 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
410 memset(consumer
->dst
.trace_path
, 0,
411 sizeof(consumer
->dst
.trace_path
));
412 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
413 sizeof(consumer
->dst
.trace_path
));
414 /* Append default trace dir */
415 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
416 sizeof(consumer
->dst
.trace_path
) -
417 strlen(consumer
->dst
.trace_path
) - 1);
418 /* Flag consumer as local. */
419 consumer
->type
= CONSUMER_DST_LOCAL
;
428 * Init tracing by creating trace directory and sending fds kernel consumer.
430 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
433 struct lttng_ht_iter iter
;
434 struct consumer_socket
*socket
;
440 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
441 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
443 /* Code flow error */
444 assert(socket
->fd
>= 0);
446 pthread_mutex_lock(socket
->lock
);
447 ret
= kernel_consumer_send_session(socket
, session
);
448 pthread_mutex_unlock(socket
->lock
);
450 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
462 * Create a socket to the relayd using the URI.
464 * On success, the relayd_sock pointer is set to the created socket.
465 * Else, it's stays untouched and a lttcomm error code is returned.
467 static int create_connect_relayd(struct consumer_output
*output
,
468 const char *session_name
, struct lttng_uri
*uri
,
469 struct lttcomm_sock
**relayd_sock
)
472 struct lttcomm_sock
*sock
;
474 /* Create socket object from URI */
475 sock
= lttcomm_alloc_sock_from_uri(uri
);
477 ret
= LTTNG_ERR_FATAL
;
481 ret
= lttcomm_create_sock(sock
);
483 ret
= LTTNG_ERR_FATAL
;
487 /* Connect to relayd so we can proceed with a session creation. */
489 ret
= relayd_connect(sock
);
492 ERR("Unable to reach lttng-relayd");
493 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
497 /* Create socket for control stream. */
498 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
499 DBG3("Creating relayd stream socket from URI");
501 /* Check relayd version */
502 ret
= relayd_version_check(sock
, RELAYD_VERSION_COMM_MAJOR
,
503 RELAYD_VERSION_COMM_MINOR
);
505 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
508 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
509 DBG3("Creating relayd data socket from URI");
511 /* Command is not valid */
512 ERR("Relayd invalid stream type: %d", uri
->stype
);
513 ret
= LTTNG_ERR_INVALID
;
523 (void) relayd_close(sock
);
527 lttcomm_destroy_sock(sock
);
534 * Connect to the relayd using URI and send the socket to the right consumer.
536 static int send_consumer_relayd_socket(int domain
, struct ltt_session
*session
,
537 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
538 struct consumer_socket
*consumer_sock
)
541 struct lttcomm_sock
*sock
= NULL
;
543 /* Set the network sequence index if not set. */
544 if (consumer
->net_seq_index
== -1) {
546 * Increment net_seq_idx because we are about to transfer the
547 * new relayd socket to the consumer.
549 uatomic_inc(&relayd_net_seq_idx
);
550 /* Assign unique key so the consumer can match streams */
551 uatomic_set(&consumer
->net_seq_index
,
552 uatomic_read(&relayd_net_seq_idx
));
555 /* Connect to relayd and make version check if uri is the control. */
556 ret
= create_connect_relayd(consumer
, session
->name
, relayd_uri
, &sock
);
557 if (ret
!= LTTNG_OK
) {
561 /* If the control socket is connected, network session is ready */
562 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
563 session
->net_handle
= 1;
566 /* Send relayd socket to consumer. */
567 ret
= consumer_send_relayd_socket(consumer_sock
, sock
,
568 consumer
, relayd_uri
->stype
, session
->id
);
570 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
574 /* Flag that the corresponding socket was sent. */
575 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
576 consumer_sock
->control_sock_sent
= 1;
577 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
578 consumer_sock
->data_sock_sent
= 1;
584 * Close socket which was dup on the consumer side. The session daemon does
585 * NOT keep track of the relayd socket(s) once transfer to the consumer.
590 (void) relayd_close(sock
);
591 lttcomm_destroy_sock(sock
);
598 * Send both relayd sockets to a specific consumer and domain. This is a
599 * helper function to facilitate sending the information to the consumer for a
602 static int send_consumer_relayd_sockets(int domain
,
603 struct ltt_session
*session
, struct consumer_output
*consumer
,
604 struct consumer_socket
*sock
)
611 /* Sending control relayd socket. */
612 if (!sock
->control_sock_sent
) {
613 ret
= send_consumer_relayd_socket(domain
, session
,
614 &consumer
->dst
.net
.control
, consumer
, sock
);
615 if (ret
!= LTTNG_OK
) {
620 /* Sending data relayd socket. */
621 if (!sock
->data_sock_sent
) {
622 ret
= send_consumer_relayd_socket(domain
, session
,
623 &consumer
->dst
.net
.data
, consumer
, sock
);
624 if (ret
!= LTTNG_OK
) {
634 * Setup relayd connections for a tracing session. First creates the socket to
635 * the relayd and send them to the right domain consumer. Consumer type MUST be
638 static int setup_relayd(struct ltt_session
*session
)
641 struct ltt_ust_session
*usess
;
642 struct ltt_kernel_session
*ksess
;
643 struct consumer_socket
*socket
;
644 struct lttng_ht_iter iter
;
648 usess
= session
->ust_session
;
649 ksess
= session
->kernel_session
;
651 DBG2("Setting relayd for session %s", session
->name
);
655 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
656 && usess
->consumer
->enabled
) {
657 /* For each consumer socket, send relayd sockets */
658 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
660 /* Code flow error */
661 assert(socket
->fd
>= 0);
663 pthread_mutex_lock(socket
->lock
);
664 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
,
665 usess
->consumer
, socket
);
666 pthread_mutex_unlock(socket
->lock
);
667 if (ret
!= LTTNG_OK
) {
673 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
674 && ksess
->consumer
->enabled
) {
675 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
677 /* Code flow error */
678 assert(socket
->fd
>= 0);
680 pthread_mutex_lock(socket
->lock
);
681 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
,
682 ksess
->consumer
, socket
);
683 pthread_mutex_unlock(socket
->lock
);
684 if (ret
!= LTTNG_OK
) {
696 * Start a kernel session by opening all necessary streams.
698 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
701 struct ltt_kernel_channel
*kchan
;
703 /* Open kernel metadata */
704 if (ksess
->metadata
== NULL
) {
705 ret
= kernel_open_metadata(ksess
);
707 ret
= LTTNG_ERR_KERN_META_FAIL
;
712 /* Open kernel metadata stream */
713 if (ksess
->metadata_stream_fd
< 0) {
714 ret
= kernel_open_metadata_stream(ksess
);
716 ERR("Kernel create metadata stream failed");
717 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
722 /* For each channel */
723 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
724 if (kchan
->stream_count
== 0) {
725 ret
= kernel_open_channel_stream(kchan
);
727 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
730 /* Update the stream global counter */
731 ksess
->stream_count_global
+= ret
;
735 /* Setup kernel consumer socket and send fds to it */
736 ret
= init_kernel_tracing(ksess
);
738 ret
= LTTNG_ERR_KERN_START_FAIL
;
742 /* This start the kernel tracing */
743 ret
= kernel_start_session(ksess
);
745 ret
= LTTNG_ERR_KERN_START_FAIL
;
749 /* Quiescent wait after starting trace */
750 kernel_wait_quiescent(kernel_tracer_fd
);
761 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
763 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
767 struct ltt_ust_session
*usess
;
769 usess
= session
->ust_session
;
774 case LTTNG_DOMAIN_KERNEL
:
776 ret
= channel_kernel_disable(session
->kernel_session
,
778 if (ret
!= LTTNG_OK
) {
782 kernel_wait_quiescent(kernel_tracer_fd
);
785 case LTTNG_DOMAIN_UST
:
787 struct ltt_ust_channel
*uchan
;
788 struct lttng_ht
*chan_ht
;
790 chan_ht
= usess
->domain_global
.channels
;
792 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
794 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
798 ret
= channel_ust_disable(usess
, domain
, uchan
);
799 if (ret
!= LTTNG_OK
) {
805 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
806 case LTTNG_DOMAIN_UST_EXEC_NAME
:
807 case LTTNG_DOMAIN_UST_PID
:
810 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
822 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
824 * The wpipe arguments is used as a notifier for the kernel thread.
826 int cmd_enable_channel(struct ltt_session
*session
,
827 int domain
, struct lttng_channel
*attr
, int wpipe
)
830 struct ltt_ust_session
*usess
= session
->ust_session
;
831 struct lttng_ht
*chan_ht
;
836 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
841 case LTTNG_DOMAIN_KERNEL
:
843 struct ltt_kernel_channel
*kchan
;
845 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
846 session
->kernel_session
);
848 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
850 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
853 if (ret
!= LTTNG_OK
) {
857 kernel_wait_quiescent(kernel_tracer_fd
);
860 * If the session was previously started, start as well this newly
861 * created kernel session so the events/channels enabled *after* the
862 * start actually work.
864 if (session
->started
&& !session
->kernel_session
->started
) {
865 ret
= start_kernel_session(session
->kernel_session
, wpipe
);
866 if (ret
!= LTTNG_OK
) {
872 case LTTNG_DOMAIN_UST
:
874 struct ltt_ust_channel
*uchan
;
876 chan_ht
= usess
->domain_global
.channels
;
878 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
880 ret
= channel_ust_create(usess
, domain
, attr
);
882 ret
= channel_ust_enable(usess
, domain
, uchan
);
885 /* Start the UST session if the session was already started. */
886 if (session
->started
&& !usess
->start_trace
) {
887 ret
= ust_app_start_trace_all(usess
);
889 ret
= LTTNG_ERR_UST_START_FAIL
;
893 usess
->start_trace
= 1;
898 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
899 case LTTNG_DOMAIN_UST_EXEC_NAME
:
900 case LTTNG_DOMAIN_UST_PID
:
903 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
914 * Command LTTNG_DISABLE_EVENT processed by the client thread.
916 int cmd_disable_event(struct ltt_session
*session
, int domain
,
917 char *channel_name
, char *event_name
)
924 case LTTNG_DOMAIN_KERNEL
:
926 struct ltt_kernel_channel
*kchan
;
927 struct ltt_kernel_session
*ksess
;
929 ksess
= session
->kernel_session
;
931 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
933 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
937 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
938 if (ret
!= LTTNG_OK
) {
942 kernel_wait_quiescent(kernel_tracer_fd
);
945 case LTTNG_DOMAIN_UST
:
947 struct ltt_ust_channel
*uchan
;
948 struct ltt_ust_session
*usess
;
950 usess
= session
->ust_session
;
952 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
955 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
959 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
960 if (ret
!= LTTNG_OK
) {
964 DBG3("Disable UST event %s in channel %s completed", event_name
,
969 case LTTNG_DOMAIN_UST_EXEC_NAME
:
970 case LTTNG_DOMAIN_UST_PID
:
971 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
986 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
988 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
996 case LTTNG_DOMAIN_KERNEL
:
998 struct ltt_kernel_session
*ksess
;
999 struct ltt_kernel_channel
*kchan
;
1001 ksess
= session
->kernel_session
;
1003 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1004 if (kchan
== NULL
) {
1005 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1009 ret
= event_kernel_disable_all(ksess
, kchan
);
1010 if (ret
!= LTTNG_OK
) {
1014 kernel_wait_quiescent(kernel_tracer_fd
);
1017 case LTTNG_DOMAIN_UST
:
1019 struct ltt_ust_session
*usess
;
1020 struct ltt_ust_channel
*uchan
;
1022 usess
= session
->ust_session
;
1024 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1026 if (uchan
== NULL
) {
1027 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1031 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
1036 DBG3("Disable all UST events in channel %s completed", channel_name
);
1041 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1042 case LTTNG_DOMAIN_UST_PID
:
1043 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1046 ret
= LTTNG_ERR_UND
;
1058 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1060 int cmd_add_context(struct ltt_session
*session
, int domain
,
1061 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1066 case LTTNG_DOMAIN_KERNEL
:
1067 assert(session
->kernel_session
);
1069 if (session
->kernel_session
->channel_count
== 0) {
1070 /* Create default channel */
1071 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1072 if (ret
!= LTTNG_OK
) {
1077 /* Add kernel context to kernel tracer */
1078 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1079 if (ret
!= LTTNG_OK
) {
1083 case LTTNG_DOMAIN_UST
:
1085 struct ltt_ust_session
*usess
= session
->ust_session
;
1088 unsigned int chan_count
=
1089 lttng_ht_get_count(usess
->domain_global
.channels
);
1090 if (chan_count
== 0) {
1091 struct lttng_channel
*attr
;
1092 /* Create default channel */
1093 attr
= channel_new_default_attr(domain
);
1095 ret
= LTTNG_ERR_FATAL
;
1099 ret
= channel_ust_create(usess
, domain
, attr
);
1100 if (ret
!= LTTNG_OK
) {
1107 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1108 if (ret
!= LTTNG_OK
) {
1114 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1115 case LTTNG_DOMAIN_UST_PID
:
1116 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1119 ret
= LTTNG_ERR_UND
;
1130 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1132 int cmd_enable_event(struct ltt_session
*session
, int domain
,
1133 char *channel_name
, struct lttng_event
*event
,
1134 struct lttng_filter_bytecode
*filter
, int wpipe
)
1137 struct lttng_channel
*attr
;
1141 assert(channel_name
);
1146 case LTTNG_DOMAIN_KERNEL
:
1148 struct ltt_kernel_channel
*kchan
;
1150 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1151 session
->kernel_session
);
1152 if (kchan
== NULL
) {
1153 attr
= channel_new_default_attr(domain
);
1155 ret
= LTTNG_ERR_FATAL
;
1158 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1160 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1161 if (ret
!= LTTNG_OK
) {
1168 /* Get the newly created kernel channel pointer */
1169 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1170 session
->kernel_session
);
1171 if (kchan
== NULL
) {
1172 /* This sould not happen... */
1173 ret
= LTTNG_ERR_FATAL
;
1177 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
1179 if (ret
!= LTTNG_OK
) {
1183 kernel_wait_quiescent(kernel_tracer_fd
);
1186 case LTTNG_DOMAIN_UST
:
1188 struct ltt_ust_channel
*uchan
;
1189 struct ltt_ust_session
*usess
= session
->ust_session
;
1193 /* Get channel from global UST domain */
1194 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1196 if (uchan
== NULL
) {
1197 /* Create default channel */
1198 attr
= channel_new_default_attr(domain
);
1200 ret
= LTTNG_ERR_FATAL
;
1203 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1205 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1206 if (ret
!= LTTNG_OK
) {
1212 /* Get the newly created channel reference back */
1213 uchan
= trace_ust_find_channel_by_name(
1214 usess
->domain_global
.channels
, channel_name
);
1218 /* At this point, the session and channel exist on the tracer */
1219 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
, filter
);
1220 if (ret
!= LTTNG_OK
) {
1226 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1227 case LTTNG_DOMAIN_UST_PID
:
1228 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1231 ret
= LTTNG_ERR_UND
;
1243 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1245 int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
1246 char *channel_name
, int event_type
,
1247 struct lttng_filter_bytecode
*filter
, int wpipe
)
1250 struct lttng_channel
*attr
;
1253 assert(channel_name
);
1258 case LTTNG_DOMAIN_KERNEL
:
1260 struct ltt_kernel_channel
*kchan
;
1262 assert(session
->kernel_session
);
1264 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1265 session
->kernel_session
);
1266 if (kchan
== NULL
) {
1267 /* Create default channel */
1268 attr
= channel_new_default_attr(domain
);
1270 ret
= LTTNG_ERR_FATAL
;
1273 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1275 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1276 if (ret
!= LTTNG_OK
) {
1282 /* Get the newly created kernel channel pointer */
1283 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1284 session
->kernel_session
);
1288 switch (event_type
) {
1289 case LTTNG_EVENT_SYSCALL
:
1290 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
1291 kchan
, kernel_tracer_fd
);
1293 case LTTNG_EVENT_TRACEPOINT
:
1295 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1296 * events already registered to the channel.
1298 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
1299 kchan
, kernel_tracer_fd
);
1301 case LTTNG_EVENT_ALL
:
1302 /* Enable syscalls and tracepoints */
1303 ret
= event_kernel_enable_all(session
->kernel_session
,
1304 kchan
, kernel_tracer_fd
);
1307 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1311 /* Manage return value */
1312 if (ret
!= LTTNG_OK
) {
1316 kernel_wait_quiescent(kernel_tracer_fd
);
1319 case LTTNG_DOMAIN_UST
:
1321 struct ltt_ust_channel
*uchan
;
1322 struct ltt_ust_session
*usess
= session
->ust_session
;
1326 /* Get channel from global UST domain */
1327 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1329 if (uchan
== NULL
) {
1330 /* Create default channel */
1331 attr
= channel_new_default_attr(domain
);
1333 ret
= LTTNG_ERR_FATAL
;
1336 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1338 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1339 if (ret
!= LTTNG_OK
) {
1345 /* Get the newly created channel reference back */
1346 uchan
= trace_ust_find_channel_by_name(
1347 usess
->domain_global
.channels
, channel_name
);
1351 /* At this point, the session and channel exist on the tracer */
1353 switch (event_type
) {
1354 case LTTNG_EVENT_ALL
:
1355 case LTTNG_EVENT_TRACEPOINT
:
1356 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
,
1358 if (ret
!= LTTNG_OK
) {
1363 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1367 /* Manage return value */
1368 if (ret
!= LTTNG_OK
) {
1375 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1376 case LTTNG_DOMAIN_UST_PID
:
1377 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1380 ret
= LTTNG_ERR_UND
;
1393 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1395 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1398 ssize_t nb_events
= 0;
1401 case LTTNG_DOMAIN_KERNEL
:
1402 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1403 if (nb_events
< 0) {
1404 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1408 case LTTNG_DOMAIN_UST
:
1409 nb_events
= ust_app_list_events(events
);
1410 if (nb_events
< 0) {
1411 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1416 ret
= LTTNG_ERR_UND
;
1423 /* Return negative value to differentiate return code */
1428 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1430 ssize_t
cmd_list_tracepoint_fields(int domain
,
1431 struct lttng_event_field
**fields
)
1434 ssize_t nb_fields
= 0;
1437 case LTTNG_DOMAIN_UST
:
1438 nb_fields
= ust_app_list_event_fields(fields
);
1439 if (nb_fields
< 0) {
1440 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1444 case LTTNG_DOMAIN_KERNEL
:
1445 default: /* fall-through */
1446 ret
= LTTNG_ERR_UND
;
1453 /* Return negative value to differentiate return code */
1458 * Command LTTNG_START_TRACE processed by the client thread.
1460 int cmd_start_trace(struct ltt_session
*session
)
1463 struct ltt_kernel_session
*ksession
;
1464 struct ltt_ust_session
*usess
;
1468 /* Ease our life a bit ;) */
1469 ksession
= session
->kernel_session
;
1470 usess
= session
->ust_session
;
1472 if (session
->enabled
) {
1473 /* Already started. */
1474 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1478 session
->enabled
= 1;
1480 ret
= setup_relayd(session
);
1481 if (ret
!= LTTNG_OK
) {
1482 ERR("Error setting up relayd for session %s", session
->name
);
1486 /* Kernel tracing */
1487 if (ksession
!= NULL
) {
1488 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1489 if (ret
!= LTTNG_OK
) {
1494 /* Flag session that trace should start automatically */
1496 usess
->start_trace
= 1;
1498 ret
= ust_app_start_trace_all(usess
);
1500 ret
= LTTNG_ERR_UST_START_FAIL
;
1505 session
->started
= 1;
1514 * Command LTTNG_STOP_TRACE processed by the client thread.
1516 int cmd_stop_trace(struct ltt_session
*session
)
1519 struct ltt_kernel_channel
*kchan
;
1520 struct ltt_kernel_session
*ksession
;
1521 struct ltt_ust_session
*usess
;
1526 ksession
= session
->kernel_session
;
1527 usess
= session
->ust_session
;
1529 if (!session
->enabled
) {
1530 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1534 session
->enabled
= 0;
1538 DBG("Stop kernel tracing");
1540 /* Flush metadata if exist */
1541 if (ksession
->metadata_stream_fd
>= 0) {
1542 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1544 ERR("Kernel metadata flush failed");
1548 /* Flush all buffers before stopping */
1549 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1550 ret
= kernel_flush_buffer(kchan
);
1552 ERR("Kernel flush buffer error");
1556 ret
= kernel_stop_session(ksession
);
1558 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1562 kernel_wait_quiescent(kernel_tracer_fd
);
1564 ksession
->started
= 0;
1568 usess
->start_trace
= 0;
1570 ret
= ust_app_stop_trace_all(usess
);
1572 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1577 session
->started
= 0;
1586 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1588 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1589 size_t nb_uri
, struct lttng_uri
*uris
)
1592 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1593 struct ltt_ust_session
*usess
= session
->ust_session
;
1594 struct consumer_output
*consumer
= NULL
;
1600 /* Can't enable consumer after session started. */
1601 if (session
->enabled
) {
1602 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1607 * This case switch makes sure the domain session has a temporary consumer
1608 * so the URL can be set.
1612 /* Code flow error. A session MUST always have a consumer object */
1613 assert(session
->consumer
);
1615 * The URL will be added to the tracing session consumer instead of a
1616 * specific domain consumer.
1618 consumer
= session
->consumer
;
1620 case LTTNG_DOMAIN_KERNEL
:
1621 /* Code flow error if we don't have a kernel session here. */
1624 /* Create consumer output if none exists */
1625 consumer
= ksess
->tmp_consumer
;
1626 if (consumer
== NULL
) {
1627 consumer
= consumer_copy_output(ksess
->consumer
);
1628 if (consumer
== NULL
) {
1629 ret
= LTTNG_ERR_FATAL
;
1632 /* Trash the consumer subdir, we are about to set a new one. */
1633 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1634 ksess
->tmp_consumer
= consumer
;
1638 case LTTNG_DOMAIN_UST
:
1639 /* Code flow error if we don't have a kernel session here. */
1642 /* Create consumer output if none exists */
1643 consumer
= usess
->tmp_consumer
;
1644 if (consumer
== NULL
) {
1645 consumer
= consumer_copy_output(usess
->consumer
);
1646 if (consumer
== NULL
) {
1647 ret
= LTTNG_ERR_FATAL
;
1650 /* Trash the consumer subdir, we are about to set a new one. */
1651 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1652 usess
->tmp_consumer
= consumer
;
1658 for (i
= 0; i
< nb_uri
; i
++) {
1659 struct consumer_socket
*socket
;
1660 struct lttng_ht_iter iter
;
1662 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1667 /* Don't send relayd socket if URI is NOT remote */
1668 if (uris
[i
].dtype
== LTTNG_DST_PATH
) {
1672 /* Try to send relayd URI to the consumer if exist. */
1674 cds_lfht_for_each_entry(consumer
->socks
->ht
, &iter
.iter
,
1675 socket
, node
.node
) {
1677 /* A socket in the HT should never have a negative fd */
1678 assert(socket
->fd
>= 0);
1680 pthread_mutex_lock(socket
->lock
);
1681 ret
= send_consumer_relayd_socket(domain
, session
, &uris
[i
],
1683 pthread_mutex_unlock(socket
->lock
);
1684 if (ret
!= LTTNG_OK
) {
1700 * Command LTTNG_CREATE_SESSION processed by the client thread.
1702 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1703 size_t nb_uri
, lttng_sock_cred
*creds
)
1707 struct ltt_session
*session
;
1712 * Verify if the session already exist
1714 * XXX: There is no need for the session lock list here since the caller
1715 * (process_client_msg) is holding it. We might want to change that so a
1716 * single command does not lock the entire session list.
1718 session
= session_find_by_name(name
);
1719 if (session
!= NULL
) {
1720 ret
= LTTNG_ERR_EXIST_SESS
;
1724 /* Create tracing session in the registry */
1725 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
1726 LTTNG_SOCK_GET_GID_CRED(creds
));
1727 if (ret
!= LTTNG_OK
) {
1732 * Get the newly created session pointer back
1734 * XXX: There is no need for the session lock list here since the caller
1735 * (process_client_msg) is holding it. We might want to change that so a
1736 * single command does not lock the entire session list.
1738 session
= session_find_by_name(name
);
1741 /* Create default consumer output for the session not yet created. */
1742 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1743 if (session
->consumer
== NULL
) {
1744 ret
= LTTNG_ERR_FATAL
;
1745 goto consumer_error
;
1749 * This means that the lttng_create_session call was called with the _path_
1750 * argument set to NULL.
1754 * At this point, we'll skip the consumer URI setup and create a
1755 * session with a NULL path which will flag the session to NOT spawn a
1758 DBG("Create session %s with NO uri, skipping consumer setup", name
);
1762 session
->start_consumer
= 1;
1764 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1765 if (ret
!= LTTNG_OK
) {
1766 goto consumer_error
;
1769 session
->consumer
->enabled
= 1;
1775 session_destroy(session
);
1782 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1784 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1787 struct ltt_ust_session
*usess
;
1788 struct ltt_kernel_session
*ksess
;
1793 usess
= session
->ust_session
;
1794 ksess
= session
->kernel_session
;
1796 /* Clean kernel session teardown */
1797 kernel_destroy_session(ksess
);
1799 /* UST session teardown */
1801 /* Close any relayd session */
1802 consumer_output_send_destroy_relayd(usess
->consumer
);
1804 /* Destroy every UST application related to this session. */
1805 ret
= ust_app_destroy_trace_all(usess
);
1807 ERR("Error in ust_app_destroy_trace_all");
1810 /* Clean up the rest. */
1811 trace_ust_destroy_session(usess
);
1815 * Must notify the kernel thread here to update it's poll set in order to
1816 * remove the channel(s)' fd just destroyed.
1818 ret
= notify_thread_pipe(wpipe
);
1820 PERROR("write kernel poll pipe");
1823 ret
= session_destroy(session
);
1829 * Command LTTNG_CALIBRATE processed by the client thread.
1831 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1836 case LTTNG_DOMAIN_KERNEL
:
1838 struct lttng_kernel_calibrate kcalibrate
;
1840 kcalibrate
.type
= calibrate
->type
;
1841 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1843 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1848 case LTTNG_DOMAIN_UST
:
1850 struct lttng_ust_calibrate ucalibrate
;
1852 ucalibrate
.type
= calibrate
->type
;
1853 ret
= ust_app_calibrate_glb(&ucalibrate
);
1855 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1861 ret
= LTTNG_ERR_UND
;
1872 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1874 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1875 const char *sock_path
, struct consumer_data
*cdata
)
1878 struct consumer_socket
*socket
;
1885 case LTTNG_DOMAIN_KERNEL
:
1887 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1891 /* Can't register a consumer if there is already one */
1892 if (ksess
->consumer_fds_sent
!= 0) {
1893 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1897 sock
= lttcomm_connect_unix_sock(sock_path
);
1899 ret
= LTTNG_ERR_CONNECT_FAIL
;
1903 socket
= consumer_allocate_socket(sock
);
1904 if (socket
== NULL
) {
1907 PERROR("close register consumer");
1909 ret
= LTTNG_ERR_FATAL
;
1913 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1914 if (socket
->lock
== NULL
) {
1915 PERROR("zmalloc pthread mutex");
1916 ret
= LTTNG_ERR_FATAL
;
1919 pthread_mutex_init(socket
->lock
, NULL
);
1920 socket
->registered
= 1;
1923 consumer_add_socket(socket
, ksess
->consumer
);
1926 pthread_mutex_lock(&cdata
->pid_mutex
);
1928 pthread_mutex_unlock(&cdata
->pid_mutex
);
1933 /* TODO: Userspace tracing */
1934 ret
= LTTNG_ERR_UND
;
1945 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1947 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1948 struct lttng_domain
**domains
)
1953 if (session
->kernel_session
!= NULL
) {
1954 DBG3("Listing domains found kernel domain");
1958 if (session
->ust_session
!= NULL
) {
1959 DBG3("Listing domains found UST global domain");
1963 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1964 if (*domains
== NULL
) {
1965 ret
= LTTNG_ERR_FATAL
;
1969 if (session
->kernel_session
!= NULL
) {
1970 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1974 if (session
->ust_session
!= NULL
) {
1975 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1982 /* Return negative value to differentiate return code */
1988 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1990 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1991 struct lttng_channel
**channels
)
1994 ssize_t nb_chan
= 0;
1997 case LTTNG_DOMAIN_KERNEL
:
1998 if (session
->kernel_session
!= NULL
) {
1999 nb_chan
= session
->kernel_session
->channel_count
;
2001 DBG3("Number of kernel channels %zd", nb_chan
);
2003 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2006 case LTTNG_DOMAIN_UST
:
2007 if (session
->ust_session
!= NULL
) {
2008 nb_chan
= lttng_ht_get_count(
2009 session
->ust_session
->domain_global
.channels
);
2011 DBG3("Number of UST global channels %zd", nb_chan
);
2013 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2018 ret
= LTTNG_ERR_UND
;
2023 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2024 if (*channels
== NULL
) {
2025 ret
= LTTNG_ERR_FATAL
;
2029 list_lttng_channels(domain
, session
, *channels
);
2032 /* Ret value was set in the domain switch case */
2039 /* Return negative value to differentiate return code */
2044 * Command LTTNG_LIST_EVENTS processed by the client thread.
2046 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2047 char *channel_name
, struct lttng_event
**events
)
2050 ssize_t nb_event
= 0;
2053 case LTTNG_DOMAIN_KERNEL
:
2054 if (session
->kernel_session
!= NULL
) {
2055 nb_event
= list_lttng_kernel_events(channel_name
,
2056 session
->kernel_session
, events
);
2059 case LTTNG_DOMAIN_UST
:
2061 if (session
->ust_session
!= NULL
) {
2062 nb_event
= list_lttng_ust_global_events(channel_name
,
2063 &session
->ust_session
->domain_global
, events
);
2068 ret
= LTTNG_ERR_UND
;
2075 /* Return negative value to differentiate return code */
2080 * Using the session list, filled a lttng_session array to send back to the
2081 * client for session listing.
2083 * The session list lock MUST be acquired before calling this function. Use
2084 * session_lock_list() and session_unlock_list().
2086 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2091 struct ltt_session
*session
;
2092 struct ltt_session_list
*list
= session_get_list();
2094 DBG("Getting all available session for UID %d GID %d",
2097 * Iterate over session list and append data after the control struct in
2100 cds_list_for_each_entry(session
, &list
->head
, list
) {
2102 * Only list the sessions the user can control.
2104 if (!session_access_ok(session
, uid
, gid
)) {
2108 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2109 struct ltt_ust_session
*usess
= session
->ust_session
;
2111 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2112 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2113 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2114 ret
= build_network_session_path(sessions
[i
].path
,
2115 sizeof(session
[i
].path
), session
);
2117 ret
= snprintf(sessions
[i
].path
, sizeof(session
[i
].path
), "%s",
2118 session
->consumer
->dst
.trace_path
);
2121 PERROR("snprintf session path");
2125 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2126 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2127 sessions
[i
].enabled
= session
->enabled
;
2133 * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
2135 int cmd_disable_consumer(int domain
, struct ltt_session
*session
)
2138 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2139 struct ltt_ust_session
*usess
= session
->ust_session
;
2140 struct consumer_output
*consumer
;
2144 if (session
->enabled
) {
2145 /* Can't disable consumer on an already started session */
2146 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2150 if (!session
->start_consumer
) {
2151 ret
= LTTNG_ERR_NO_CONSUMER
;
2157 DBG("Disable tracing session %s consumer", session
->name
);
2158 consumer
= session
->consumer
;
2160 case LTTNG_DOMAIN_KERNEL
:
2161 /* Code flow error if we don't have a kernel session here. */
2164 DBG("Disabling kernel consumer");
2165 consumer
= ksess
->consumer
;
2168 case LTTNG_DOMAIN_UST
:
2169 /* Code flow error if we don't have a UST session here. */
2172 DBG("Disabling UST consumer");
2173 consumer
= usess
->consumer
;
2177 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2182 consumer
->enabled
= 0;
2183 /* Success at this point */
2186 ret
= LTTNG_ERR_NO_CONSUMER
;
2194 * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
2196 int cmd_enable_consumer(int domain
, struct ltt_session
*session
)
2199 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2200 struct ltt_ust_session
*usess
= session
->ust_session
;
2201 struct consumer_output
*consumer
= NULL
;
2205 /* Can't enable consumer after session started. */
2206 if (session
->enabled
) {
2207 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2213 assert(session
->consumer
);
2214 consumer
= session
->consumer
;
2216 case LTTNG_DOMAIN_KERNEL
:
2217 /* Code flow error if we don't have a kernel session here. */
2221 * Check if we have already sent fds to the consumer. In that case,
2222 * the enable-consumer command can't be used because a start trace
2223 * had previously occured.
2225 if (ksess
->consumer_fds_sent
) {
2226 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2230 consumer
= ksess
->tmp_consumer
;
2231 if (consumer
== NULL
) {
2233 /* No temp. consumer output exists. Using the current one. */
2234 DBG3("No temporary consumer. Using default");
2235 consumer
= ksess
->consumer
;
2239 switch (consumer
->type
) {
2240 case CONSUMER_DST_LOCAL
:
2241 DBG2("Consumer output is local. Creating directory(ies)");
2243 /* Create directory(ies) */
2244 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2245 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2247 if (ret
!= -EEXIST
) {
2248 ERR("Trace directory creation error");
2249 ret
= LTTNG_ERR_FATAL
;
2254 case CONSUMER_DST_NET
:
2255 DBG2("Consumer output is network. Validating URIs");
2256 /* Validate if we have both control and data path set. */
2257 if (!consumer
->dst
.net
.control_isset
) {
2258 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2262 if (!consumer
->dst
.net
.data_isset
) {
2263 ret
= LTTNG_ERR_URL_DATA_MISS
;
2267 /* Check established network session state */
2268 if (session
->net_handle
== 0) {
2269 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2270 ERR("Session network handle is not set on enable-consumer");
2279 * This is race free for now since the session lock is acquired before
2280 * ending up in this function. No other threads can access this kernel
2281 * session without this lock hence freeing the consumer output object
2285 /* Destroy current consumer. We are about to replace it */
2286 consumer_destroy_output(ksess
->consumer
);
2288 ksess
->consumer
= consumer
;
2289 ksess
->tmp_consumer
= NULL
;
2292 case LTTNG_DOMAIN_UST
:
2293 /* Code flow error if we don't have a UST session here. */
2297 * Check if we have already sent fds to the consumer. In that case,
2298 * the enable-consumer command can't be used because a start trace
2299 * had previously occured.
2301 if (usess
->start_trace
) {
2302 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2306 consumer
= usess
->tmp_consumer
;
2307 if (consumer
== NULL
) {
2309 /* No temp. consumer output exists. Using the current one. */
2310 DBG3("No temporary consumer. Using default");
2311 consumer
= usess
->consumer
;
2315 switch (consumer
->type
) {
2316 case CONSUMER_DST_LOCAL
:
2317 DBG2("Consumer output is local. Creating directory(ies)");
2319 /* Create directory(ies) */
2320 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2321 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2323 if (ret
!= -EEXIST
) {
2324 ERR("Trace directory creation error");
2325 ret
= LTTNG_ERR_FATAL
;
2330 case CONSUMER_DST_NET
:
2331 DBG2("Consumer output is network. Validating URIs");
2332 /* Validate if we have both control and data path set. */
2333 if (!consumer
->dst
.net
.control_isset
) {
2334 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2338 if (!consumer
->dst
.net
.data_isset
) {
2339 ret
= LTTNG_ERR_URL_DATA_MISS
;
2343 /* Check established network session state */
2344 if (session
->net_handle
== 0) {
2345 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2346 DBG2("Session network handle is not set on enable-consumer");
2350 if (consumer
->net_seq_index
== -1) {
2351 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2352 DBG2("Network index is not set on the consumer");
2361 * This is race free for now since the session lock is acquired before
2362 * ending up in this function. No other threads can access this kernel
2363 * session without this lock hence freeing the consumer output object
2367 /* Destroy current consumer. We are about to replace it */
2368 consumer_destroy_output(usess
->consumer
);
2370 usess
->consumer
= consumer
;
2371 usess
->tmp_consumer
= NULL
;
2376 session
->start_consumer
= 1;
2380 consumer
->enabled
= 1;
2381 /* Success at this point */
2384 /* Should not really happend... */
2385 ret
= LTTNG_ERR_NO_CONSUMER
;
2393 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2394 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2396 int cmd_data_pending(struct ltt_session
*session
)
2399 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2400 struct ltt_ust_session
*usess
= session
->ust_session
;
2404 /* Session MUST be stopped to ask for data availability. */
2405 if (session
->enabled
) {
2406 ret
= LTTNG_ERR_SESSION_STARTED
;
2410 if (ksess
&& ksess
->consumer
) {
2411 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2413 /* Data is still being extracted for the kernel. */
2418 if (usess
&& usess
->consumer
) {
2419 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2421 /* Data is still being extracted for the kernel. */
2426 /* Data is ready to be read by a viewer */
2434 * Init command subsystem.
2439 * Set network sequence index to 1 for streams to match a relayd socket on
2440 * the consumer side.
2442 uatomic_set(&relayd_net_seq_idx
, 1);
2444 DBG("Command subsystem initialized");