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. */
488 ret
= relayd_connect(sock
);
490 ERR("Unable to reach lttng-relayd");
491 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
495 /* Create socket for control stream. */
496 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
497 DBG3("Creating relayd stream socket from URI");
499 /* Check relayd version */
500 ret
= relayd_version_check(sock
, RELAYD_VERSION_COMM_MAJOR
,
501 RELAYD_VERSION_COMM_MINOR
);
503 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
506 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
507 DBG3("Creating relayd data socket from URI");
509 /* Command is not valid */
510 ERR("Relayd invalid stream type: %d", uri
->stype
);
511 ret
= LTTNG_ERR_INVALID
;
521 (void) relayd_close(sock
);
525 lttcomm_destroy_sock(sock
);
532 * Connect to the relayd using URI and send the socket to the right consumer.
534 static int send_consumer_relayd_socket(int domain
, struct ltt_session
*session
,
535 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
536 struct consumer_socket
*consumer_sock
)
539 struct lttcomm_sock
*sock
= NULL
;
541 /* Set the network sequence index if not set. */
542 if (consumer
->net_seq_index
== -1) {
544 * Increment net_seq_idx because we are about to transfer the
545 * new relayd socket to the consumer.
547 uatomic_inc(&relayd_net_seq_idx
);
548 /* Assign unique key so the consumer can match streams */
549 uatomic_set(&consumer
->net_seq_index
,
550 uatomic_read(&relayd_net_seq_idx
));
553 /* Connect to relayd and make version check if uri is the control. */
554 ret
= create_connect_relayd(consumer
, session
->name
, relayd_uri
, &sock
);
555 if (ret
!= LTTNG_OK
) {
559 /* If the control socket is connected, network session is ready */
560 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
561 session
->net_handle
= 1;
564 /* Send relayd socket to consumer. */
565 ret
= consumer_send_relayd_socket(consumer_sock
, sock
,
566 consumer
, relayd_uri
->stype
, session
->id
);
568 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
572 /* Flag that the corresponding socket was sent. */
573 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
574 consumer
->dst
.net
.control_sock_sent
= 1;
575 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
576 consumer
->dst
.net
.data_sock_sent
= 1;
582 * Close socket which was dup on the consumer side. The session daemon does
583 * NOT keep track of the relayd socket(s) once transfer to the consumer.
588 (void) relayd_close(sock
);
589 lttcomm_destroy_sock(sock
);
596 * Send both relayd sockets to a specific consumer and domain. This is a
597 * helper function to facilitate sending the information to the consumer for a
600 static int send_consumer_relayd_sockets(int domain
,
601 struct ltt_session
*session
, struct consumer_output
*consumer
,
602 struct consumer_socket
*sock
)
609 /* Sending control relayd socket. */
610 if (!consumer
->dst
.net
.control_sock_sent
) {
611 ret
= send_consumer_relayd_socket(domain
, session
,
612 &consumer
->dst
.net
.control
, consumer
, sock
);
613 if (ret
!= LTTNG_OK
) {
618 /* Sending data relayd socket. */
619 if (!consumer
->dst
.net
.data_sock_sent
) {
620 ret
= send_consumer_relayd_socket(domain
, session
,
621 &consumer
->dst
.net
.data
, consumer
, sock
);
622 if (ret
!= LTTNG_OK
) {
632 * Setup relayd connections for a tracing session. First creates the socket to
633 * the relayd and send them to the right domain consumer. Consumer type MUST be
636 static int setup_relayd(struct ltt_session
*session
)
639 struct ltt_ust_session
*usess
;
640 struct ltt_kernel_session
*ksess
;
641 struct consumer_socket
*socket
;
642 struct lttng_ht_iter iter
;
646 usess
= session
->ust_session
;
647 ksess
= session
->kernel_session
;
649 DBG2("Setting relayd for session %s", session
->name
);
653 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
654 && usess
->consumer
->enabled
) {
655 /* For each consumer socket, send relayd sockets */
656 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
658 /* Code flow error */
659 assert(socket
->fd
>= 0);
661 pthread_mutex_lock(socket
->lock
);
662 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
,
663 usess
->consumer
, socket
);
664 pthread_mutex_unlock(socket
->lock
);
665 if (ret
!= LTTNG_OK
) {
671 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
672 && ksess
->consumer
->enabled
) {
673 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
675 /* Code flow error */
676 assert(socket
->fd
>= 0);
678 pthread_mutex_lock(socket
->lock
);
679 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
,
680 ksess
->consumer
, socket
);
681 pthread_mutex_unlock(socket
->lock
);
682 if (ret
!= LTTNG_OK
) {
694 * Start a kernel session by opening all necessary streams.
696 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
699 struct ltt_kernel_channel
*kchan
;
701 /* Open kernel metadata */
702 if (ksess
->metadata
== NULL
) {
703 ret
= kernel_open_metadata(ksess
);
705 ret
= LTTNG_ERR_KERN_META_FAIL
;
710 /* Open kernel metadata stream */
711 if (ksess
->metadata_stream_fd
< 0) {
712 ret
= kernel_open_metadata_stream(ksess
);
714 ERR("Kernel create metadata stream failed");
715 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
720 /* For each channel */
721 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
722 if (kchan
->stream_count
== 0) {
723 ret
= kernel_open_channel_stream(kchan
);
725 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
728 /* Update the stream global counter */
729 ksess
->stream_count_global
+= ret
;
733 /* Setup kernel consumer socket and send fds to it */
734 ret
= init_kernel_tracing(ksess
);
736 ret
= LTTNG_ERR_KERN_START_FAIL
;
740 /* This start the kernel tracing */
741 ret
= kernel_start_session(ksess
);
743 ret
= LTTNG_ERR_KERN_START_FAIL
;
747 /* Quiescent wait after starting trace */
748 kernel_wait_quiescent(kernel_tracer_fd
);
759 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
761 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
765 struct ltt_ust_session
*usess
;
767 usess
= session
->ust_session
;
772 case LTTNG_DOMAIN_KERNEL
:
774 ret
= channel_kernel_disable(session
->kernel_session
,
776 if (ret
!= LTTNG_OK
) {
780 kernel_wait_quiescent(kernel_tracer_fd
);
783 case LTTNG_DOMAIN_UST
:
785 struct ltt_ust_channel
*uchan
;
786 struct lttng_ht
*chan_ht
;
788 chan_ht
= usess
->domain_global
.channels
;
790 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
792 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
796 ret
= channel_ust_disable(usess
, domain
, uchan
);
797 if (ret
!= LTTNG_OK
) {
803 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
804 case LTTNG_DOMAIN_UST_EXEC_NAME
:
805 case LTTNG_DOMAIN_UST_PID
:
808 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
820 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
822 * The wpipe arguments is used as a notifier for the kernel thread.
824 int cmd_enable_channel(struct ltt_session
*session
,
825 int domain
, struct lttng_channel
*attr
, int wpipe
)
828 struct ltt_ust_session
*usess
= session
->ust_session
;
829 struct lttng_ht
*chan_ht
;
834 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
839 case LTTNG_DOMAIN_KERNEL
:
841 struct ltt_kernel_channel
*kchan
;
843 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
844 session
->kernel_session
);
846 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
848 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
851 if (ret
!= LTTNG_OK
) {
855 kernel_wait_quiescent(kernel_tracer_fd
);
858 * If the session was previously started, start as well this newly
859 * created kernel session so the events/channels enabled *after* the
860 * start actually work.
862 if (session
->started
&& !session
->kernel_session
->started
) {
863 ret
= start_kernel_session(session
->kernel_session
, wpipe
);
864 if (ret
!= LTTNG_OK
) {
870 case LTTNG_DOMAIN_UST
:
872 struct ltt_ust_channel
*uchan
;
874 chan_ht
= usess
->domain_global
.channels
;
876 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
878 ret
= channel_ust_create(usess
, domain
, attr
);
880 ret
= channel_ust_enable(usess
, domain
, uchan
);
883 /* Start the UST session if the session was already started. */
884 if (session
->started
&& !usess
->start_trace
) {
885 ret
= ust_app_start_trace_all(usess
);
887 ret
= LTTNG_ERR_UST_START_FAIL
;
891 usess
->start_trace
= 1;
896 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
897 case LTTNG_DOMAIN_UST_EXEC_NAME
:
898 case LTTNG_DOMAIN_UST_PID
:
901 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
912 * Command LTTNG_DISABLE_EVENT processed by the client thread.
914 int cmd_disable_event(struct ltt_session
*session
, int domain
,
915 char *channel_name
, char *event_name
)
922 case LTTNG_DOMAIN_KERNEL
:
924 struct ltt_kernel_channel
*kchan
;
925 struct ltt_kernel_session
*ksess
;
927 ksess
= session
->kernel_session
;
929 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
931 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
935 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
936 if (ret
!= LTTNG_OK
) {
940 kernel_wait_quiescent(kernel_tracer_fd
);
943 case LTTNG_DOMAIN_UST
:
945 struct ltt_ust_channel
*uchan
;
946 struct ltt_ust_session
*usess
;
948 usess
= session
->ust_session
;
950 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
953 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
957 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
958 if (ret
!= LTTNG_OK
) {
962 DBG3("Disable UST event %s in channel %s completed", event_name
,
967 case LTTNG_DOMAIN_UST_EXEC_NAME
:
968 case LTTNG_DOMAIN_UST_PID
:
969 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
984 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
986 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
994 case LTTNG_DOMAIN_KERNEL
:
996 struct ltt_kernel_session
*ksess
;
997 struct ltt_kernel_channel
*kchan
;
999 ksess
= session
->kernel_session
;
1001 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1002 if (kchan
== NULL
) {
1003 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1007 ret
= event_kernel_disable_all(kchan
);
1008 if (ret
!= LTTNG_OK
) {
1012 kernel_wait_quiescent(kernel_tracer_fd
);
1015 case LTTNG_DOMAIN_UST
:
1017 struct ltt_ust_session
*usess
;
1018 struct ltt_ust_channel
*uchan
;
1020 usess
= session
->ust_session
;
1022 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1024 if (uchan
== NULL
) {
1025 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1029 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
1034 DBG3("Disable all UST events in channel %s completed", channel_name
);
1039 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1040 case LTTNG_DOMAIN_UST_PID
:
1041 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1044 ret
= LTTNG_ERR_UND
;
1056 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1058 int cmd_add_context(struct ltt_session
*session
, int domain
,
1059 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1064 case LTTNG_DOMAIN_KERNEL
:
1065 assert(session
->kernel_session
);
1067 if (session
->kernel_session
->channel_count
== 0) {
1068 /* Create default channel */
1069 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1070 if (ret
!= LTTNG_OK
) {
1075 /* Add kernel context to kernel tracer */
1076 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1077 if (ret
!= LTTNG_OK
) {
1081 case LTTNG_DOMAIN_UST
:
1083 struct ltt_ust_session
*usess
= session
->ust_session
;
1086 unsigned int chan_count
=
1087 lttng_ht_get_count(usess
->domain_global
.channels
);
1088 if (chan_count
== 0) {
1089 struct lttng_channel
*attr
;
1090 /* Create default channel */
1091 attr
= channel_new_default_attr(domain
);
1093 ret
= LTTNG_ERR_FATAL
;
1097 ret
= channel_ust_create(usess
, domain
, attr
);
1098 if (ret
!= LTTNG_OK
) {
1105 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1106 if (ret
!= LTTNG_OK
) {
1112 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1113 case LTTNG_DOMAIN_UST_PID
:
1114 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1117 ret
= LTTNG_ERR_UND
;
1128 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1130 int cmd_enable_event(struct ltt_session
*session
, int domain
,
1131 char *channel_name
, struct lttng_event
*event
,
1132 struct lttng_filter_bytecode
*filter
, int wpipe
)
1134 int ret
, channel_created
= 0;
1135 struct lttng_channel
*attr
;
1139 assert(channel_name
);
1144 case LTTNG_DOMAIN_KERNEL
:
1146 struct ltt_kernel_channel
*kchan
;
1148 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1149 session
->kernel_session
);
1150 if (kchan
== NULL
) {
1151 attr
= channel_new_default_attr(domain
);
1153 ret
= LTTNG_ERR_FATAL
;
1156 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1158 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1159 if (ret
!= LTTNG_OK
) {
1165 channel_created
= 1;
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(kchan
, event
);
1178 if (ret
!= LTTNG_OK
) {
1179 if (channel_created
) {
1180 /* Let's not leak a useless channel. */
1181 kernel_destroy_channel(kchan
);
1186 kernel_wait_quiescent(kernel_tracer_fd
);
1189 case LTTNG_DOMAIN_UST
:
1191 struct ltt_ust_channel
*uchan
;
1192 struct ltt_ust_session
*usess
= session
->ust_session
;
1196 /* Get channel from global UST domain */
1197 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1199 if (uchan
== NULL
) {
1200 /* Create default channel */
1201 attr
= channel_new_default_attr(domain
);
1203 ret
= LTTNG_ERR_FATAL
;
1206 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1208 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1209 if (ret
!= LTTNG_OK
) {
1215 /* Get the newly created channel reference back */
1216 uchan
= trace_ust_find_channel_by_name(
1217 usess
->domain_global
.channels
, channel_name
);
1221 /* At this point, the session and channel exist on the tracer */
1222 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
, filter
);
1223 if (ret
!= LTTNG_OK
) {
1229 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1230 case LTTNG_DOMAIN_UST_PID
:
1231 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1234 ret
= LTTNG_ERR_UND
;
1246 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1248 int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
1249 char *channel_name
, int event_type
,
1250 struct lttng_filter_bytecode
*filter
, int wpipe
)
1253 struct lttng_channel
*attr
;
1256 assert(channel_name
);
1261 case LTTNG_DOMAIN_KERNEL
:
1263 struct ltt_kernel_channel
*kchan
;
1265 assert(session
->kernel_session
);
1267 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1268 session
->kernel_session
);
1269 if (kchan
== NULL
) {
1270 /* Create default channel */
1271 attr
= channel_new_default_attr(domain
);
1273 ret
= LTTNG_ERR_FATAL
;
1276 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1278 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1279 if (ret
!= LTTNG_OK
) {
1285 /* Get the newly created kernel channel pointer */
1286 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1287 session
->kernel_session
);
1291 switch (event_type
) {
1292 case LTTNG_EVENT_SYSCALL
:
1293 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1295 case LTTNG_EVENT_TRACEPOINT
:
1297 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1298 * events already registered to the channel.
1300 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1302 case LTTNG_EVENT_ALL
:
1303 /* Enable syscalls and tracepoints */
1304 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1307 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1311 /* Manage return value */
1312 if (ret
!= LTTNG_OK
) {
1314 * On error, cmd_enable_channel call will take care of destroying
1315 * the created channel if it was needed.
1320 kernel_wait_quiescent(kernel_tracer_fd
);
1323 case LTTNG_DOMAIN_UST
:
1325 struct ltt_ust_channel
*uchan
;
1326 struct ltt_ust_session
*usess
= session
->ust_session
;
1330 /* Get channel from global UST domain */
1331 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1333 if (uchan
== NULL
) {
1334 /* Create default channel */
1335 attr
= channel_new_default_attr(domain
);
1337 ret
= LTTNG_ERR_FATAL
;
1340 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1342 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1343 if (ret
!= LTTNG_OK
) {
1349 /* Get the newly created channel reference back */
1350 uchan
= trace_ust_find_channel_by_name(
1351 usess
->domain_global
.channels
, channel_name
);
1355 /* At this point, the session and channel exist on the tracer */
1357 switch (event_type
) {
1358 case LTTNG_EVENT_ALL
:
1359 case LTTNG_EVENT_TRACEPOINT
:
1360 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
,
1362 if (ret
!= LTTNG_OK
) {
1367 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1371 /* Manage return value */
1372 if (ret
!= LTTNG_OK
) {
1379 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1380 case LTTNG_DOMAIN_UST_PID
:
1381 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1384 ret
= LTTNG_ERR_UND
;
1397 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1399 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1402 ssize_t nb_events
= 0;
1405 case LTTNG_DOMAIN_KERNEL
:
1406 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1407 if (nb_events
< 0) {
1408 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1412 case LTTNG_DOMAIN_UST
:
1413 nb_events
= ust_app_list_events(events
);
1414 if (nb_events
< 0) {
1415 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1420 ret
= LTTNG_ERR_UND
;
1427 /* Return negative value to differentiate return code */
1432 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1434 ssize_t
cmd_list_tracepoint_fields(int domain
,
1435 struct lttng_event_field
**fields
)
1438 ssize_t nb_fields
= 0;
1441 case LTTNG_DOMAIN_UST
:
1442 nb_fields
= ust_app_list_event_fields(fields
);
1443 if (nb_fields
< 0) {
1444 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1448 case LTTNG_DOMAIN_KERNEL
:
1449 default: /* fall-through */
1450 ret
= LTTNG_ERR_UND
;
1457 /* Return negative value to differentiate return code */
1462 * Command LTTNG_START_TRACE processed by the client thread.
1464 int cmd_start_trace(struct ltt_session
*session
)
1467 struct ltt_kernel_session
*ksession
;
1468 struct ltt_ust_session
*usess
;
1472 /* Ease our life a bit ;) */
1473 ksession
= session
->kernel_session
;
1474 usess
= session
->ust_session
;
1476 if (session
->enabled
) {
1477 /* Already started. */
1478 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1482 session
->enabled
= 1;
1484 ret
= setup_relayd(session
);
1485 if (ret
!= LTTNG_OK
) {
1486 ERR("Error setting up relayd for session %s", session
->name
);
1490 /* Kernel tracing */
1491 if (ksession
!= NULL
) {
1492 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1493 if (ret
!= LTTNG_OK
) {
1498 /* Flag session that trace should start automatically */
1500 usess
->start_trace
= 1;
1502 ret
= ust_app_start_trace_all(usess
);
1504 ret
= LTTNG_ERR_UST_START_FAIL
;
1509 session
->started
= 1;
1518 * Command LTTNG_STOP_TRACE processed by the client thread.
1520 int cmd_stop_trace(struct ltt_session
*session
)
1523 struct ltt_kernel_channel
*kchan
;
1524 struct ltt_kernel_session
*ksession
;
1525 struct ltt_ust_session
*usess
;
1530 ksession
= session
->kernel_session
;
1531 usess
= session
->ust_session
;
1533 if (!session
->enabled
) {
1534 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1538 session
->enabled
= 0;
1542 DBG("Stop kernel tracing");
1544 /* Flush metadata if exist */
1545 if (ksession
->metadata_stream_fd
>= 0) {
1546 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1548 ERR("Kernel metadata flush failed");
1552 /* Flush all buffers before stopping */
1553 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1554 ret
= kernel_flush_buffer(kchan
);
1556 ERR("Kernel flush buffer error");
1560 ret
= kernel_stop_session(ksession
);
1562 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1566 kernel_wait_quiescent(kernel_tracer_fd
);
1568 ksession
->started
= 0;
1572 usess
->start_trace
= 0;
1574 ret
= ust_app_stop_trace_all(usess
);
1576 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1581 session
->started
= 0;
1590 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1592 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1593 size_t nb_uri
, struct lttng_uri
*uris
)
1596 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1597 struct ltt_ust_session
*usess
= session
->ust_session
;
1598 struct consumer_output
*consumer
= NULL
;
1604 /* Can't enable consumer after session started. */
1605 if (session
->enabled
) {
1606 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1611 * This case switch makes sure the domain session has a temporary consumer
1612 * so the URL can be set.
1616 /* Code flow error. A session MUST always have a consumer object */
1617 assert(session
->consumer
);
1619 * The URL will be added to the tracing session consumer instead of a
1620 * specific domain consumer.
1622 consumer
= session
->consumer
;
1624 case LTTNG_DOMAIN_KERNEL
:
1625 /* Code flow error if we don't have a kernel session here. */
1628 /* Create consumer output if none exists */
1629 consumer
= ksess
->tmp_consumer
;
1630 if (consumer
== NULL
) {
1631 consumer
= consumer_copy_output(ksess
->consumer
);
1632 if (consumer
== NULL
) {
1633 ret
= LTTNG_ERR_FATAL
;
1636 /* Trash the consumer subdir, we are about to set a new one. */
1637 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1638 ksess
->tmp_consumer
= consumer
;
1642 case LTTNG_DOMAIN_UST
:
1643 /* Code flow error if we don't have a kernel session here. */
1646 /* Create consumer output if none exists */
1647 consumer
= usess
->tmp_consumer
;
1648 if (consumer
== NULL
) {
1649 consumer
= consumer_copy_output(usess
->consumer
);
1650 if (consumer
== NULL
) {
1651 ret
= LTTNG_ERR_FATAL
;
1654 /* Trash the consumer subdir, we are about to set a new one. */
1655 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1656 usess
->tmp_consumer
= consumer
;
1662 for (i
= 0; i
< nb_uri
; i
++) {
1663 struct consumer_socket
*socket
;
1664 struct lttng_ht_iter iter
;
1666 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1672 * Don't send relayd socket if URI is NOT remote or if the relayd
1673 * socket for the session was already sent.
1675 if (uris
[i
].dtype
== LTTNG_DST_PATH
||
1676 (uris
[i
].stype
== LTTNG_STREAM_CONTROL
&&
1677 consumer
->dst
.net
.control_sock_sent
) ||
1678 (uris
[i
].stype
== LTTNG_STREAM_DATA
&&
1679 consumer
->dst
.net
.data_sock_sent
)) {
1683 /* Try to send relayd URI to the consumer if exist. */
1685 cds_lfht_for_each_entry(consumer
->socks
->ht
, &iter
.iter
,
1686 socket
, node
.node
) {
1688 /* A socket in the HT should never have a negative fd */
1689 assert(socket
->fd
>= 0);
1691 pthread_mutex_lock(socket
->lock
);
1692 ret
= send_consumer_relayd_socket(domain
, session
, &uris
[i
],
1694 pthread_mutex_unlock(socket
->lock
);
1695 if (ret
!= LTTNG_OK
) {
1711 * Command LTTNG_CREATE_SESSION processed by the client thread.
1713 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1714 size_t nb_uri
, lttng_sock_cred
*creds
)
1718 struct ltt_session
*session
;
1723 * Verify if the session already exist
1725 * XXX: There is no need for the session lock list here since the caller
1726 * (process_client_msg) is holding it. We might want to change that so a
1727 * single command does not lock the entire session list.
1729 session
= session_find_by_name(name
);
1730 if (session
!= NULL
) {
1731 ret
= LTTNG_ERR_EXIST_SESS
;
1735 /* Create tracing session in the registry */
1736 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
1737 LTTNG_SOCK_GET_GID_CRED(creds
));
1738 if (ret
!= LTTNG_OK
) {
1743 * Get the newly created session pointer back
1745 * XXX: There is no need for the session lock list here since the caller
1746 * (process_client_msg) is holding it. We might want to change that so a
1747 * single command does not lock the entire session list.
1749 session
= session_find_by_name(name
);
1752 /* Create default consumer output for the session not yet created. */
1753 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1754 if (session
->consumer
== NULL
) {
1755 ret
= LTTNG_ERR_FATAL
;
1756 goto consumer_error
;
1760 * This means that the lttng_create_session call was called with the _path_
1761 * argument set to NULL.
1765 * At this point, we'll skip the consumer URI setup and create a
1766 * session with a NULL path which will flag the session to NOT spawn a
1769 DBG("Create session %s with NO uri, skipping consumer setup", name
);
1773 session
->start_consumer
= 1;
1775 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1776 if (ret
!= LTTNG_OK
) {
1777 goto consumer_error
;
1780 session
->consumer
->enabled
= 1;
1786 session_destroy(session
);
1793 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1795 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1798 struct ltt_ust_session
*usess
;
1799 struct ltt_kernel_session
*ksess
;
1804 usess
= session
->ust_session
;
1805 ksess
= session
->kernel_session
;
1807 /* Clean kernel session teardown */
1808 kernel_destroy_session(ksess
);
1810 /* UST session teardown */
1812 /* Close any relayd session */
1813 consumer_output_send_destroy_relayd(usess
->consumer
);
1815 /* Destroy every UST application related to this session. */
1816 ret
= ust_app_destroy_trace_all(usess
);
1818 ERR("Error in ust_app_destroy_trace_all");
1821 /* Clean up the rest. */
1822 trace_ust_destroy_session(usess
);
1826 * Must notify the kernel thread here to update it's poll set in order to
1827 * remove the channel(s)' fd just destroyed.
1829 ret
= notify_thread_pipe(wpipe
);
1831 PERROR("write kernel poll pipe");
1834 ret
= session_destroy(session
);
1840 * Command LTTNG_CALIBRATE processed by the client thread.
1842 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1847 case LTTNG_DOMAIN_KERNEL
:
1849 struct lttng_kernel_calibrate kcalibrate
;
1851 kcalibrate
.type
= calibrate
->type
;
1852 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1854 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1859 case LTTNG_DOMAIN_UST
:
1861 struct lttng_ust_calibrate ucalibrate
;
1863 ucalibrate
.type
= calibrate
->type
;
1864 ret
= ust_app_calibrate_glb(&ucalibrate
);
1866 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1872 ret
= LTTNG_ERR_UND
;
1883 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1885 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1886 const char *sock_path
, struct consumer_data
*cdata
)
1889 struct consumer_socket
*socket
;
1896 case LTTNG_DOMAIN_KERNEL
:
1898 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1902 /* Can't register a consumer if there is already one */
1903 if (ksess
->consumer_fds_sent
!= 0) {
1904 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1908 sock
= lttcomm_connect_unix_sock(sock_path
);
1910 ret
= LTTNG_ERR_CONNECT_FAIL
;
1914 socket
= consumer_allocate_socket(sock
);
1915 if (socket
== NULL
) {
1918 PERROR("close register consumer");
1920 ret
= LTTNG_ERR_FATAL
;
1924 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1925 if (socket
->lock
== NULL
) {
1926 PERROR("zmalloc pthread mutex");
1927 ret
= LTTNG_ERR_FATAL
;
1930 pthread_mutex_init(socket
->lock
, NULL
);
1931 socket
->registered
= 1;
1934 consumer_add_socket(socket
, ksess
->consumer
);
1937 pthread_mutex_lock(&cdata
->pid_mutex
);
1939 pthread_mutex_unlock(&cdata
->pid_mutex
);
1944 /* TODO: Userspace tracing */
1945 ret
= LTTNG_ERR_UND
;
1956 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1958 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1959 struct lttng_domain
**domains
)
1964 if (session
->kernel_session
!= NULL
) {
1965 DBG3("Listing domains found kernel domain");
1969 if (session
->ust_session
!= NULL
) {
1970 DBG3("Listing domains found UST global domain");
1974 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1975 if (*domains
== NULL
) {
1976 ret
= LTTNG_ERR_FATAL
;
1980 if (session
->kernel_session
!= NULL
) {
1981 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1985 if (session
->ust_session
!= NULL
) {
1986 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1993 /* Return negative value to differentiate return code */
1999 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2001 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
2002 struct lttng_channel
**channels
)
2005 ssize_t nb_chan
= 0;
2008 case LTTNG_DOMAIN_KERNEL
:
2009 if (session
->kernel_session
!= NULL
) {
2010 nb_chan
= session
->kernel_session
->channel_count
;
2012 DBG3("Number of kernel channels %zd", nb_chan
);
2014 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2017 case LTTNG_DOMAIN_UST
:
2018 if (session
->ust_session
!= NULL
) {
2019 nb_chan
= lttng_ht_get_count(
2020 session
->ust_session
->domain_global
.channels
);
2022 DBG3("Number of UST global channels %zd", nb_chan
);
2024 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2029 ret
= LTTNG_ERR_UND
;
2034 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2035 if (*channels
== NULL
) {
2036 ret
= LTTNG_ERR_FATAL
;
2040 list_lttng_channels(domain
, session
, *channels
);
2043 /* Ret value was set in the domain switch case */
2050 /* Return negative value to differentiate return code */
2055 * Command LTTNG_LIST_EVENTS processed by the client thread.
2057 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2058 char *channel_name
, struct lttng_event
**events
)
2061 ssize_t nb_event
= 0;
2064 case LTTNG_DOMAIN_KERNEL
:
2065 if (session
->kernel_session
!= NULL
) {
2066 nb_event
= list_lttng_kernel_events(channel_name
,
2067 session
->kernel_session
, events
);
2070 case LTTNG_DOMAIN_UST
:
2072 if (session
->ust_session
!= NULL
) {
2073 nb_event
= list_lttng_ust_global_events(channel_name
,
2074 &session
->ust_session
->domain_global
, events
);
2079 ret
= LTTNG_ERR_UND
;
2086 /* Return negative value to differentiate return code */
2091 * Using the session list, filled a lttng_session array to send back to the
2092 * client for session listing.
2094 * The session list lock MUST be acquired before calling this function. Use
2095 * session_lock_list() and session_unlock_list().
2097 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2102 struct ltt_session
*session
;
2103 struct ltt_session_list
*list
= session_get_list();
2105 DBG("Getting all available session for UID %d GID %d",
2108 * Iterate over session list and append data after the control struct in
2111 cds_list_for_each_entry(session
, &list
->head
, list
) {
2113 * Only list the sessions the user can control.
2115 if (!session_access_ok(session
, uid
, gid
)) {
2119 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2120 struct ltt_ust_session
*usess
= session
->ust_session
;
2122 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2123 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2124 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2125 ret
= build_network_session_path(sessions
[i
].path
,
2126 sizeof(session
[i
].path
), session
);
2128 ret
= snprintf(sessions
[i
].path
, sizeof(session
[i
].path
), "%s",
2129 session
->consumer
->dst
.trace_path
);
2132 PERROR("snprintf session path");
2136 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2137 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2138 sessions
[i
].enabled
= session
->enabled
;
2144 * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
2146 int cmd_disable_consumer(int domain
, struct ltt_session
*session
)
2149 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2150 struct ltt_ust_session
*usess
= session
->ust_session
;
2151 struct consumer_output
*consumer
;
2155 if (session
->enabled
) {
2156 /* Can't disable consumer on an already started session */
2157 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2161 if (!session
->start_consumer
) {
2162 ret
= LTTNG_ERR_NO_CONSUMER
;
2168 DBG("Disable tracing session %s consumer", session
->name
);
2169 consumer
= session
->consumer
;
2171 case LTTNG_DOMAIN_KERNEL
:
2172 /* Code flow error if we don't have a kernel session here. */
2175 DBG("Disabling kernel consumer");
2176 consumer
= ksess
->consumer
;
2179 case LTTNG_DOMAIN_UST
:
2180 /* Code flow error if we don't have a UST session here. */
2183 DBG("Disabling UST consumer");
2184 consumer
= usess
->consumer
;
2188 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2193 consumer
->enabled
= 0;
2194 /* Success at this point */
2197 ret
= LTTNG_ERR_NO_CONSUMER
;
2205 * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
2207 int cmd_enable_consumer(int domain
, struct ltt_session
*session
)
2210 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2211 struct ltt_ust_session
*usess
= session
->ust_session
;
2212 struct consumer_output
*consumer
= NULL
;
2216 /* Can't enable consumer after session started. */
2217 if (session
->enabled
) {
2218 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2224 assert(session
->consumer
);
2225 consumer
= session
->consumer
;
2227 case LTTNG_DOMAIN_KERNEL
:
2228 /* Code flow error if we don't have a kernel session here. */
2232 * Check if we have already sent fds to the consumer. In that case,
2233 * the enable-consumer command can't be used because a start trace
2234 * had previously occured.
2236 if (ksess
->consumer_fds_sent
) {
2237 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2241 consumer
= ksess
->tmp_consumer
;
2242 if (consumer
== NULL
) {
2244 /* No temp. consumer output exists. Using the current one. */
2245 DBG3("No temporary consumer. Using default");
2246 consumer
= ksess
->consumer
;
2250 switch (consumer
->type
) {
2251 case CONSUMER_DST_LOCAL
:
2252 DBG2("Consumer output is local. Creating directory(ies)");
2254 /* Create directory(ies) */
2255 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2256 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2258 if (ret
!= -EEXIST
) {
2259 ERR("Trace directory creation error");
2260 ret
= LTTNG_ERR_FATAL
;
2265 case CONSUMER_DST_NET
:
2266 DBG2("Consumer output is network. Validating URIs");
2267 /* Validate if we have both control and data path set. */
2268 if (!consumer
->dst
.net
.control_isset
) {
2269 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2273 if (!consumer
->dst
.net
.data_isset
) {
2274 ret
= LTTNG_ERR_URL_DATA_MISS
;
2278 /* Check established network session state */
2279 if (session
->net_handle
== 0) {
2280 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2281 ERR("Session network handle is not set on enable-consumer");
2290 * This is race free for now since the session lock is acquired before
2291 * ending up in this function. No other threads can access this kernel
2292 * session without this lock hence freeing the consumer output object
2296 /* Destroy current consumer. We are about to replace it */
2297 consumer_destroy_output(ksess
->consumer
);
2299 ksess
->consumer
= consumer
;
2300 ksess
->tmp_consumer
= NULL
;
2303 case LTTNG_DOMAIN_UST
:
2304 /* Code flow error if we don't have a UST session here. */
2308 * Check if we have already sent fds to the consumer. In that case,
2309 * the enable-consumer command can't be used because a start trace
2310 * had previously occured.
2312 if (usess
->start_trace
) {
2313 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2317 consumer
= usess
->tmp_consumer
;
2318 if (consumer
== NULL
) {
2320 /* No temp. consumer output exists. Using the current one. */
2321 DBG3("No temporary consumer. Using default");
2322 consumer
= usess
->consumer
;
2326 switch (consumer
->type
) {
2327 case CONSUMER_DST_LOCAL
:
2328 DBG2("Consumer output is local. Creating directory(ies)");
2330 /* Create directory(ies) */
2331 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2332 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2334 if (ret
!= -EEXIST
) {
2335 ERR("Trace directory creation error");
2336 ret
= LTTNG_ERR_FATAL
;
2341 case CONSUMER_DST_NET
:
2342 DBG2("Consumer output is network. Validating URIs");
2343 /* Validate if we have both control and data path set. */
2344 if (!consumer
->dst
.net
.control_isset
) {
2345 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2349 if (!consumer
->dst
.net
.data_isset
) {
2350 ret
= LTTNG_ERR_URL_DATA_MISS
;
2354 /* Check established network session state */
2355 if (session
->net_handle
== 0) {
2356 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2357 DBG2("Session network handle is not set on enable-consumer");
2361 if (consumer
->net_seq_index
== -1) {
2362 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2363 DBG2("Network index is not set on the consumer");
2372 * This is race free for now since the session lock is acquired before
2373 * ending up in this function. No other threads can access this kernel
2374 * session without this lock hence freeing the consumer output object
2378 /* Destroy current consumer. We are about to replace it */
2379 consumer_destroy_output(usess
->consumer
);
2381 usess
->consumer
= consumer
;
2382 usess
->tmp_consumer
= NULL
;
2387 session
->start_consumer
= 1;
2391 consumer
->enabled
= 1;
2392 /* Success at this point */
2395 /* Should not really happend... */
2396 ret
= LTTNG_ERR_NO_CONSUMER
;
2404 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2405 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2407 int cmd_data_pending(struct ltt_session
*session
)
2410 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2411 struct ltt_ust_session
*usess
= session
->ust_session
;
2415 /* Session MUST be stopped to ask for data availability. */
2416 if (session
->enabled
) {
2417 ret
= LTTNG_ERR_SESSION_STARTED
;
2421 if (ksess
&& ksess
->consumer
) {
2422 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2424 /* Data is still being extracted for the kernel. */
2429 if (usess
&& usess
->consumer
) {
2430 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2432 /* Data is still being extracted for the kernel. */
2437 /* Data is ready to be read by a viewer */
2445 * Init command subsystem.
2450 * Set network sequence index to 1 for streams to match a relayd socket on
2451 * the consumer side.
2453 uatomic_set(&relayd_net_seq_idx
, 1);
2455 DBG("Command subsystem initialized");