2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #include <urcu/list.h>
21 #include <urcu/uatomic.h>
23 #include <common/defaults.h>
24 #include <common/common.h>
25 #include <common/sessiond-comm/sessiond-comm.h>
26 #include <common/relayd/relayd.h>
33 #include "kernel-consumer.h"
34 #include "lttng-sessiond.h"
40 * Used to keep a unique index for each relayd socket created where this value
41 * is associated with streams on the consumer so it can match the right relayd
42 * to send to. It must be accessed with the relayd_net_seq_idx_lock
45 static pthread_mutex_t relayd_net_seq_idx_lock
= PTHREAD_MUTEX_INITIALIZER
;
46 static uint64_t relayd_net_seq_idx
;
49 * Create a session path used by list_lttng_sessions for the case that the
50 * session consumer is on the network.
52 static int build_network_session_path(char *dst
, size_t size
,
53 struct ltt_session
*session
)
55 int ret
, kdata_port
, udata_port
;
56 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
57 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
62 memset(tmp_urls
, 0, sizeof(tmp_urls
));
63 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
65 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
67 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
68 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
69 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
72 if (session
->ust_session
&& session
->ust_session
->consumer
) {
73 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
74 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
77 if (uuri
== NULL
&& kuri
== NULL
) {
78 uri
= &session
->consumer
->dst
.net
.control
;
79 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
80 } else if (kuri
&& uuri
) {
81 ret
= uri_compare(kuri
, uuri
);
85 /* Build uuri URL string */
86 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
93 } else if (kuri
&& uuri
== NULL
) {
95 } else if (uuri
&& kuri
== NULL
) {
99 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
105 * Do we have a UST url set. If yes, this means we have both kernel and UST
108 if (*tmp_uurl
!= '\0') {
109 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
110 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
116 /* No kernel URI, use the UST port. */
119 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, dport
);
127 * Fill lttng_channel array of all channels.
129 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
130 struct lttng_channel
*channels
)
133 struct ltt_kernel_channel
*kchan
;
135 DBG("Listing channels for session %s", session
->name
);
138 case LTTNG_DOMAIN_KERNEL
:
139 /* Kernel channels */
140 if (session
->kernel_session
!= NULL
) {
141 cds_list_for_each_entry(kchan
,
142 &session
->kernel_session
->channel_list
.head
, list
) {
143 /* Copy lttng_channel struct to array */
144 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
145 channels
[i
].enabled
= kchan
->enabled
;
150 case LTTNG_DOMAIN_UST
:
152 struct lttng_ht_iter iter
;
153 struct ltt_ust_channel
*uchan
;
156 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
157 &iter
.iter
, uchan
, node
.node
) {
158 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
159 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
160 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
161 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
162 channels
[i
].attr
.switch_timer_interval
=
163 uchan
->attr
.switch_timer_interval
;
164 channels
[i
].attr
.read_timer_interval
=
165 uchan
->attr
.read_timer_interval
;
166 channels
[i
].enabled
= uchan
->enabled
;
167 switch (uchan
->attr
.output
) {
170 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
184 * Create a list of ust global domain events.
186 static int list_lttng_ust_global_events(char *channel_name
,
187 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
190 unsigned int nb_event
= 0;
191 struct lttng_ht_iter iter
;
192 struct lttng_ht_node_str
*node
;
193 struct ltt_ust_channel
*uchan
;
194 struct ltt_ust_event
*uevent
;
195 struct lttng_event
*tmp
;
197 DBG("Listing UST global events for channel %s", channel_name
);
201 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
202 node
= lttng_ht_iter_get_node_str(&iter
);
204 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
208 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
210 nb_event
+= lttng_ht_get_count(uchan
->events
);
217 DBG3("Listing UST global %d events", nb_event
);
219 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
221 ret
= LTTNG_ERR_FATAL
;
225 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
226 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
227 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
228 tmp
[i
].enabled
= uevent
->enabled
;
230 switch (uevent
->attr
.instrumentation
) {
231 case LTTNG_UST_TRACEPOINT
:
232 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
234 case LTTNG_UST_PROBE
:
235 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
237 case LTTNG_UST_FUNCTION
:
238 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
242 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
243 switch (uevent
->attr
.loglevel_type
) {
244 case LTTNG_UST_LOGLEVEL_ALL
:
245 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
247 case LTTNG_UST_LOGLEVEL_RANGE
:
248 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
250 case LTTNG_UST_LOGLEVEL_SINGLE
:
251 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
254 if (uevent
->filter
) {
269 * Fill lttng_event array of all kernel events in the channel.
271 static int list_lttng_kernel_events(char *channel_name
,
272 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
275 unsigned int nb_event
;
276 struct ltt_kernel_event
*event
;
277 struct ltt_kernel_channel
*kchan
;
279 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
281 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
285 nb_event
= kchan
->event_count
;
287 DBG("Listing events for channel %s", kchan
->channel
->name
);
293 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
294 if (*events
== NULL
) {
295 ret
= LTTNG_ERR_FATAL
;
299 /* Kernel channels */
300 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
301 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
302 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
303 (*events
)[i
].enabled
= event
->enabled
;
305 switch (event
->event
->instrumentation
) {
306 case LTTNG_KERNEL_TRACEPOINT
:
307 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
309 case LTTNG_KERNEL_KRETPROBE
:
310 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
311 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
312 sizeof(struct lttng_kernel_kprobe
));
314 case LTTNG_KERNEL_KPROBE
:
315 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
316 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
317 sizeof(struct lttng_kernel_kprobe
));
319 case LTTNG_KERNEL_FUNCTION
:
320 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
321 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
322 sizeof(struct lttng_kernel_function
));
324 case LTTNG_KERNEL_NOOP
:
325 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
327 case LTTNG_KERNEL_SYSCALL
:
328 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
330 case LTTNG_KERNEL_ALL
:
341 /* Negate the error code to differentiate the size from an error */
346 * Add URI so the consumer output object. Set the correct path depending on the
347 * domain adding the default trace directory.
349 static int add_uri_to_consumer(struct consumer_output
*consumer
,
350 struct lttng_uri
*uri
, int domain
, const char *session_name
)
353 const char *default_trace_dir
;
357 if (consumer
== NULL
) {
358 DBG("No consumer detected. Don't add URI. Stopping.");
359 ret
= LTTNG_ERR_NO_CONSUMER
;
364 case LTTNG_DOMAIN_KERNEL
:
365 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
367 case LTTNG_DOMAIN_UST
:
368 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
372 * This case is possible is we try to add the URI to the global tracing
373 * session consumer object which in this case there is no subdir.
375 default_trace_dir
= "";
378 switch (uri
->dtype
) {
381 DBG2("Setting network URI to consumer");
383 consumer
->type
= CONSUMER_DST_NET
;
385 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
386 consumer
->dst
.net
.control_isset
) ||
387 (uri
->stype
== LTTNG_STREAM_DATA
&&
388 consumer
->dst
.net
.data_isset
)) {
389 ret
= LTTNG_ERR_URL_EXIST
;
393 /* Set URI into consumer output object */
394 ret
= consumer_set_network_uri(consumer
, uri
);
396 ret
= LTTNG_ERR_FATAL
;
398 } else if (ret
== 1) {
400 * URI was the same in the consumer so we do not append the subdir
401 * again so to not duplicate output dir.
406 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
407 ret
= consumer_set_subdir(consumer
, session_name
);
409 ret
= LTTNG_ERR_FATAL
;
414 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
415 /* On a new subdir, reappend the default trace dir. */
416 strncat(consumer
->subdir
, default_trace_dir
,
417 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
418 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
423 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
424 memset(consumer
->dst
.trace_path
, 0,
425 sizeof(consumer
->dst
.trace_path
));
426 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
427 sizeof(consumer
->dst
.trace_path
));
428 /* Append default trace dir */
429 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
430 sizeof(consumer
->dst
.trace_path
) -
431 strlen(consumer
->dst
.trace_path
) - 1);
432 /* Flag consumer as local. */
433 consumer
->type
= CONSUMER_DST_LOCAL
;
442 * Init tracing by creating trace directory and sending fds kernel consumer.
444 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
447 struct lttng_ht_iter iter
;
448 struct consumer_socket
*socket
;
454 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
455 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
457 /* Code flow error */
458 assert(socket
->fd
>= 0);
460 pthread_mutex_lock(socket
->lock
);
461 ret
= kernel_consumer_send_session(socket
, session
);
462 pthread_mutex_unlock(socket
->lock
);
464 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
476 * Create a socket to the relayd using the URI.
478 * On success, the relayd_sock pointer is set to the created socket.
479 * Else, it's stays untouched and a lttcomm error code is returned.
481 static int create_connect_relayd(struct lttng_uri
*uri
,
482 struct lttcomm_relayd_sock
**relayd_sock
)
485 struct lttcomm_relayd_sock
*rsock
;
487 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
488 RELAYD_VERSION_COMM_MINOR
);
490 ret
= LTTNG_ERR_FATAL
;
495 * Connect to relayd so we can proceed with a session creation. This call
496 * can possibly block for an arbitrary amount of time to set the health
497 * state to be in poll execution.
500 ret
= relayd_connect(rsock
);
503 ERR("Unable to reach lttng-relayd");
504 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
508 /* Create socket for control stream. */
509 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
510 DBG3("Creating relayd stream socket from URI");
512 /* Check relayd version */
513 ret
= relayd_version_check(rsock
);
515 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
518 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
519 DBG3("Creating relayd data socket from URI");
521 /* Command is not valid */
522 ERR("Relayd invalid stream type: %d", uri
->stype
);
523 ret
= LTTNG_ERR_INVALID
;
527 *relayd_sock
= rsock
;
532 /* The returned value is not useful since we are on an error path. */
533 (void) relayd_close(rsock
);
541 * Connect to the relayd using URI and send the socket to the right consumer.
543 static int send_consumer_relayd_socket(int domain
, struct ltt_session
*session
,
544 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
545 struct consumer_socket
*consumer_sock
)
548 struct lttcomm_relayd_sock
*rsock
= NULL
;
550 /* Connect to relayd and make version check if uri is the control. */
551 ret
= create_connect_relayd(relayd_uri
, &rsock
);
552 if (ret
!= LTTNG_OK
) {
557 /* If the control socket is connected, network session is ready */
558 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
559 session
->net_handle
= 1;
562 /* Set the network sequence index if not set. */
563 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
564 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
566 * Increment net_seq_idx because we are about to transfer the
567 * new relayd socket to the consumer.
568 * Assign unique key so the consumer can match streams.
570 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
571 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
574 /* Send relayd socket to consumer. */
575 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
576 relayd_uri
->stype
, session
->id
);
578 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
582 /* Flag that the corresponding socket was sent. */
583 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
584 consumer_sock
->control_sock_sent
= 1;
585 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
586 consumer_sock
->data_sock_sent
= 1;
592 * Close socket which was dup on the consumer side. The session daemon does
593 * NOT keep track of the relayd socket(s) once transfer to the consumer.
597 (void) relayd_close(rsock
);
601 if (ret
!= LTTNG_OK
) {
603 * On error, nullify the consumer sequence index so streams are not
604 * associated with it once sent to the consumer.
606 uatomic_set(&consumer
->net_seq_index
, -1);
612 * Send both relayd sockets to a specific consumer and domain. This is a
613 * helper function to facilitate sending the information to the consumer for a
616 static int send_consumer_relayd_sockets(int domain
,
617 struct ltt_session
*session
, struct consumer_output
*consumer
,
618 struct consumer_socket
*sock
)
625 /* Sending control relayd socket. */
626 if (!sock
->control_sock_sent
) {
627 ret
= send_consumer_relayd_socket(domain
, session
,
628 &consumer
->dst
.net
.control
, consumer
, sock
);
629 if (ret
!= LTTNG_OK
) {
634 /* Sending data relayd socket. */
635 if (!sock
->data_sock_sent
) {
636 ret
= send_consumer_relayd_socket(domain
, session
,
637 &consumer
->dst
.net
.data
, consumer
, sock
);
638 if (ret
!= LTTNG_OK
) {
648 * Setup relayd connections for a tracing session. First creates the socket to
649 * the relayd and send them to the right domain consumer. Consumer type MUST be
652 int cmd_setup_relayd(struct ltt_session
*session
)
655 struct ltt_ust_session
*usess
;
656 struct ltt_kernel_session
*ksess
;
657 struct consumer_socket
*socket
;
658 struct lttng_ht_iter iter
;
662 usess
= session
->ust_session
;
663 ksess
= session
->kernel_session
;
665 DBG("Setting relayd for session %s", session
->name
);
669 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
670 && usess
->consumer
->enabled
) {
671 /* For each consumer socket, send relayd sockets */
672 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
674 /* Code flow error */
675 assert(socket
->fd
>= 0);
677 pthread_mutex_lock(socket
->lock
);
678 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
,
679 usess
->consumer
, socket
);
680 pthread_mutex_unlock(socket
->lock
);
681 if (ret
!= LTTNG_OK
) {
687 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
688 && ksess
->consumer
->enabled
) {
689 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
691 /* Code flow error */
692 assert(socket
->fd
>= 0);
694 pthread_mutex_lock(socket
->lock
);
695 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
,
696 ksess
->consumer
, socket
);
697 pthread_mutex_unlock(socket
->lock
);
698 if (ret
!= LTTNG_OK
) {
710 * Start a kernel session by opening all necessary streams.
712 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
715 struct ltt_kernel_channel
*kchan
;
717 /* Open kernel metadata */
718 if (ksess
->metadata
== NULL
) {
719 ret
= kernel_open_metadata(ksess
);
721 ret
= LTTNG_ERR_KERN_META_FAIL
;
726 /* Open kernel metadata stream */
727 if (ksess
->metadata_stream_fd
< 0) {
728 ret
= kernel_open_metadata_stream(ksess
);
730 ERR("Kernel create metadata stream failed");
731 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
736 /* For each channel */
737 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
738 if (kchan
->stream_count
== 0) {
739 ret
= kernel_open_channel_stream(kchan
);
741 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
744 /* Update the stream global counter */
745 ksess
->stream_count_global
+= ret
;
749 /* Setup kernel consumer socket and send fds to it */
750 ret
= init_kernel_tracing(ksess
);
752 ret
= LTTNG_ERR_KERN_START_FAIL
;
756 /* This start the kernel tracing */
757 ret
= kernel_start_session(ksess
);
759 ret
= LTTNG_ERR_KERN_START_FAIL
;
763 /* Quiescent wait after starting trace */
764 kernel_wait_quiescent(kernel_tracer_fd
);
775 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
777 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
781 struct ltt_ust_session
*usess
;
783 usess
= session
->ust_session
;
788 case LTTNG_DOMAIN_KERNEL
:
790 ret
= channel_kernel_disable(session
->kernel_session
,
792 if (ret
!= LTTNG_OK
) {
796 kernel_wait_quiescent(kernel_tracer_fd
);
799 case LTTNG_DOMAIN_UST
:
801 struct ltt_ust_channel
*uchan
;
802 struct lttng_ht
*chan_ht
;
804 chan_ht
= usess
->domain_global
.channels
;
806 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
808 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
812 ret
= channel_ust_disable(usess
, uchan
);
813 if (ret
!= LTTNG_OK
) {
819 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
820 case LTTNG_DOMAIN_UST_EXEC_NAME
:
821 case LTTNG_DOMAIN_UST_PID
:
824 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
836 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
838 * The wpipe arguments is used as a notifier for the kernel thread.
840 int cmd_enable_channel(struct ltt_session
*session
,
841 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
844 struct ltt_ust_session
*usess
= session
->ust_session
;
845 struct lttng_ht
*chan_ht
;
851 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
855 switch (domain
->type
) {
856 case LTTNG_DOMAIN_KERNEL
:
858 struct ltt_kernel_channel
*kchan
;
860 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
861 session
->kernel_session
);
863 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
865 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
868 if (ret
!= LTTNG_OK
) {
872 kernel_wait_quiescent(kernel_tracer_fd
);
875 * If the session was previously started, start as well this newly
876 * created kernel session so the events/channels enabled *after* the
877 * start actually work.
879 if (session
->started
&& !session
->kernel_session
->started
) {
880 ret
= start_kernel_session(session
->kernel_session
, wpipe
);
881 if (ret
!= LTTNG_OK
) {
887 case LTTNG_DOMAIN_UST
:
889 struct ltt_ust_channel
*uchan
;
891 chan_ht
= usess
->domain_global
.channels
;
893 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
895 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
897 ret
= channel_ust_enable(usess
, uchan
);
900 /* Start the UST session if the session was already started. */
901 if (session
->started
&& !usess
->start_trace
) {
902 ret
= ust_app_start_trace_all(usess
);
904 ret
= LTTNG_ERR_UST_START_FAIL
;
908 usess
->start_trace
= 1;
913 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
924 * Command LTTNG_DISABLE_EVENT processed by the client thread.
926 int cmd_disable_event(struct ltt_session
*session
, int domain
,
927 char *channel_name
, char *event_name
)
934 case LTTNG_DOMAIN_KERNEL
:
936 struct ltt_kernel_channel
*kchan
;
937 struct ltt_kernel_session
*ksess
;
939 ksess
= session
->kernel_session
;
941 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
943 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
947 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
948 if (ret
!= LTTNG_OK
) {
952 kernel_wait_quiescent(kernel_tracer_fd
);
955 case LTTNG_DOMAIN_UST
:
957 struct ltt_ust_channel
*uchan
;
958 struct ltt_ust_session
*usess
;
960 usess
= session
->ust_session
;
962 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
965 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
969 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
970 if (ret
!= LTTNG_OK
) {
974 DBG3("Disable UST event %s in channel %s completed", event_name
,
979 case LTTNG_DOMAIN_UST_EXEC_NAME
:
980 case LTTNG_DOMAIN_UST_PID
:
981 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
996 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
998 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
1006 case LTTNG_DOMAIN_KERNEL
:
1008 struct ltt_kernel_session
*ksess
;
1009 struct ltt_kernel_channel
*kchan
;
1011 ksess
= session
->kernel_session
;
1013 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1014 if (kchan
== NULL
) {
1015 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1019 ret
= event_kernel_disable_all(kchan
);
1020 if (ret
!= LTTNG_OK
) {
1024 kernel_wait_quiescent(kernel_tracer_fd
);
1027 case LTTNG_DOMAIN_UST
:
1029 struct ltt_ust_session
*usess
;
1030 struct ltt_ust_channel
*uchan
;
1032 usess
= session
->ust_session
;
1034 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1036 if (uchan
== NULL
) {
1037 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1041 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1046 DBG3("Disable all UST events in channel %s completed", channel_name
);
1051 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1052 case LTTNG_DOMAIN_UST_PID
:
1053 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1056 ret
= LTTNG_ERR_UND
;
1068 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1070 int cmd_add_context(struct ltt_session
*session
, int domain
,
1071 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1076 case LTTNG_DOMAIN_KERNEL
:
1077 assert(session
->kernel_session
);
1079 if (session
->kernel_session
->channel_count
== 0) {
1080 /* Create default channel */
1081 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1082 if (ret
!= LTTNG_OK
) {
1087 /* Add kernel context to kernel tracer */
1088 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1089 if (ret
!= LTTNG_OK
) {
1093 case LTTNG_DOMAIN_UST
:
1095 struct ltt_ust_session
*usess
= session
->ust_session
;
1098 unsigned int chan_count
=
1099 lttng_ht_get_count(usess
->domain_global
.channels
);
1100 if (chan_count
== 0) {
1101 struct lttng_channel
*attr
;
1102 /* Create default channel */
1103 attr
= channel_new_default_attr(domain
);
1105 ret
= LTTNG_ERR_FATAL
;
1109 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1110 if (ret
!= LTTNG_OK
) {
1117 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1118 if (ret
!= LTTNG_OK
) {
1124 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1125 case LTTNG_DOMAIN_UST_PID
:
1126 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1129 ret
= LTTNG_ERR_UND
;
1140 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1142 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1143 char *channel_name
, struct lttng_event
*event
,
1144 struct lttng_filter_bytecode
*filter
, int wpipe
)
1146 int ret
, channel_created
= 0;
1147 struct lttng_channel
*attr
;
1151 assert(channel_name
);
1155 switch (domain
->type
) {
1156 case LTTNG_DOMAIN_KERNEL
:
1158 struct ltt_kernel_channel
*kchan
;
1160 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1161 session
->kernel_session
);
1162 if (kchan
== NULL
) {
1163 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
);
1165 ret
= LTTNG_ERR_FATAL
;
1168 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1170 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1171 if (ret
!= LTTNG_OK
) {
1177 channel_created
= 1;
1180 /* Get the newly created kernel channel pointer */
1181 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1182 session
->kernel_session
);
1183 if (kchan
== NULL
) {
1184 /* This sould not happen... */
1185 ret
= LTTNG_ERR_FATAL
;
1189 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1190 if (ret
!= LTTNG_OK
) {
1191 if (channel_created
) {
1192 /* Let's not leak a useless channel. */
1193 kernel_destroy_channel(kchan
);
1198 kernel_wait_quiescent(kernel_tracer_fd
);
1201 case LTTNG_DOMAIN_UST
:
1203 struct ltt_ust_channel
*uchan
;
1204 struct ltt_ust_session
*usess
= session
->ust_session
;
1208 /* Get channel from global UST domain */
1209 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1211 if (uchan
== NULL
) {
1212 /* Create default channel */
1213 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
);
1215 ret
= LTTNG_ERR_FATAL
;
1218 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1220 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1221 if (ret
!= LTTNG_OK
) {
1227 /* Get the newly created channel reference back */
1228 uchan
= trace_ust_find_channel_by_name(
1229 usess
->domain_global
.channels
, channel_name
);
1233 /* At this point, the session and channel exist on the tracer */
1234 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
, filter
);
1235 if (ret
!= LTTNG_OK
) {
1241 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1242 case LTTNG_DOMAIN_UST_PID
:
1243 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1246 ret
= LTTNG_ERR_UND
;
1258 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1260 int cmd_enable_event_all(struct ltt_session
*session
,
1261 struct lttng_domain
*domain
, char *channel_name
, int event_type
,
1262 struct lttng_filter_bytecode
*filter
, int wpipe
)
1265 struct lttng_channel
*attr
;
1268 assert(channel_name
);
1272 switch (domain
->type
) {
1273 case LTTNG_DOMAIN_KERNEL
:
1275 struct ltt_kernel_channel
*kchan
;
1277 assert(session
->kernel_session
);
1279 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1280 session
->kernel_session
);
1281 if (kchan
== NULL
) {
1282 /* Create default channel */
1283 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
);
1285 ret
= LTTNG_ERR_FATAL
;
1288 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1290 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1291 if (ret
!= LTTNG_OK
) {
1297 /* Get the newly created kernel channel pointer */
1298 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1299 session
->kernel_session
);
1303 switch (event_type
) {
1304 case LTTNG_EVENT_SYSCALL
:
1305 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1307 case LTTNG_EVENT_TRACEPOINT
:
1309 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1310 * events already registered to the channel.
1312 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1314 case LTTNG_EVENT_ALL
:
1315 /* Enable syscalls and tracepoints */
1316 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1319 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1323 /* Manage return value */
1324 if (ret
!= LTTNG_OK
) {
1326 * On error, cmd_enable_channel call will take care of destroying
1327 * the created channel if it was needed.
1332 kernel_wait_quiescent(kernel_tracer_fd
);
1335 case LTTNG_DOMAIN_UST
:
1337 struct ltt_ust_channel
*uchan
;
1338 struct ltt_ust_session
*usess
= session
->ust_session
;
1342 /* Get channel from global UST domain */
1343 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1345 if (uchan
== NULL
) {
1346 /* Create default channel */
1347 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
);
1349 ret
= LTTNG_ERR_FATAL
;
1352 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1354 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1355 if (ret
!= LTTNG_OK
) {
1361 /* Get the newly created channel reference back */
1362 uchan
= trace_ust_find_channel_by_name(
1363 usess
->domain_global
.channels
, channel_name
);
1367 /* At this point, the session and channel exist on the tracer */
1369 switch (event_type
) {
1370 case LTTNG_EVENT_ALL
:
1371 case LTTNG_EVENT_TRACEPOINT
:
1372 ret
= event_ust_enable_all_tracepoints(usess
, uchan
, filter
);
1373 if (ret
!= LTTNG_OK
) {
1378 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1382 /* Manage return value */
1383 if (ret
!= LTTNG_OK
) {
1390 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1391 case LTTNG_DOMAIN_UST_PID
:
1392 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1395 ret
= LTTNG_ERR_UND
;
1408 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1410 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1413 ssize_t nb_events
= 0;
1416 case LTTNG_DOMAIN_KERNEL
:
1417 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1418 if (nb_events
< 0) {
1419 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1423 case LTTNG_DOMAIN_UST
:
1424 nb_events
= ust_app_list_events(events
);
1425 if (nb_events
< 0) {
1426 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1431 ret
= LTTNG_ERR_UND
;
1438 /* Return negative value to differentiate return code */
1443 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1445 ssize_t
cmd_list_tracepoint_fields(int domain
,
1446 struct lttng_event_field
**fields
)
1449 ssize_t nb_fields
= 0;
1452 case LTTNG_DOMAIN_UST
:
1453 nb_fields
= ust_app_list_event_fields(fields
);
1454 if (nb_fields
< 0) {
1455 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1459 case LTTNG_DOMAIN_KERNEL
:
1460 default: /* fall-through */
1461 ret
= LTTNG_ERR_UND
;
1468 /* Return negative value to differentiate return code */
1473 * Command LTTNG_START_TRACE processed by the client thread.
1475 int cmd_start_trace(struct ltt_session
*session
)
1478 struct ltt_kernel_session
*ksession
;
1479 struct ltt_ust_session
*usess
;
1483 /* Ease our life a bit ;) */
1484 ksession
= session
->kernel_session
;
1485 usess
= session
->ust_session
;
1487 if (session
->enabled
) {
1488 /* Already started. */
1489 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1493 session
->enabled
= 1;
1495 /* Kernel tracing */
1496 if (ksession
!= NULL
) {
1497 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1498 if (ret
!= LTTNG_OK
) {
1503 /* Flag session that trace should start automatically */
1505 usess
->start_trace
= 1;
1507 ret
= ust_app_start_trace_all(usess
);
1509 ret
= LTTNG_ERR_UST_START_FAIL
;
1514 session
->started
= 1;
1523 * Command LTTNG_STOP_TRACE processed by the client thread.
1525 int cmd_stop_trace(struct ltt_session
*session
)
1528 struct ltt_kernel_channel
*kchan
;
1529 struct ltt_kernel_session
*ksession
;
1530 struct ltt_ust_session
*usess
;
1535 ksession
= session
->kernel_session
;
1536 usess
= session
->ust_session
;
1538 if (!session
->enabled
) {
1539 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1543 session
->enabled
= 0;
1547 DBG("Stop kernel tracing");
1549 /* Flush metadata if exist */
1550 if (ksession
->metadata_stream_fd
>= 0) {
1551 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1553 ERR("Kernel metadata flush failed");
1557 /* Flush all buffers before stopping */
1558 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1559 ret
= kernel_flush_buffer(kchan
);
1561 ERR("Kernel flush buffer error");
1565 ret
= kernel_stop_session(ksession
);
1567 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1571 kernel_wait_quiescent(kernel_tracer_fd
);
1573 ksession
->started
= 0;
1577 usess
->start_trace
= 0;
1579 ret
= ust_app_stop_trace_all(usess
);
1581 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1586 session
->started
= 0;
1595 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1597 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1598 size_t nb_uri
, struct lttng_uri
*uris
)
1601 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1602 struct ltt_ust_session
*usess
= session
->ust_session
;
1603 struct consumer_output
*consumer
= NULL
;
1609 /* Can't enable consumer after session started. */
1610 if (session
->enabled
) {
1611 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1616 * This case switch makes sure the domain session has a temporary consumer
1617 * so the URL can be set.
1621 /* Code flow error. A session MUST always have a consumer object */
1622 assert(session
->consumer
);
1624 * The URL will be added to the tracing session consumer instead of a
1625 * specific domain consumer.
1627 consumer
= session
->consumer
;
1629 case LTTNG_DOMAIN_KERNEL
:
1630 /* Code flow error if we don't have a kernel session here. */
1632 assert(ksess
->consumer
);
1633 consumer
= ksess
->consumer
;
1635 case LTTNG_DOMAIN_UST
:
1636 /* Code flow error if we don't have a kernel session here. */
1638 assert(usess
->consumer
);
1639 consumer
= usess
->consumer
;
1643 for (i
= 0; i
< nb_uri
; i
++) {
1644 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1658 * Command LTTNG_CREATE_SESSION processed by the client thread.
1660 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1661 size_t nb_uri
, lttng_sock_cred
*creds
)
1665 struct ltt_session
*session
;
1669 /* No URIs is not possible. */
1671 ret
= LTTNG_ERR_SESSION_FAIL
;
1676 * Verify if the session already exist
1678 * XXX: There is no need for the session lock list here since the caller
1679 * (process_client_msg) is holding it. We might want to change that so a
1680 * single command does not lock the entire session list.
1682 session
= session_find_by_name(name
);
1683 if (session
!= NULL
) {
1684 ret
= LTTNG_ERR_EXIST_SESS
;
1688 /* Create tracing session in the registry */
1689 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
1690 LTTNG_SOCK_GET_GID_CRED(creds
));
1691 if (ret
!= LTTNG_OK
) {
1696 * Get the newly created session pointer back
1698 * XXX: There is no need for the session lock list here since the caller
1699 * (process_client_msg) is holding it. We might want to change that so a
1700 * single command does not lock the entire session list.
1702 session
= session_find_by_name(name
);
1705 /* Create default consumer output for the session not yet created. */
1706 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1707 if (session
->consumer
== NULL
) {
1708 ret
= LTTNG_ERR_FATAL
;
1709 goto consumer_error
;
1712 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1713 if (ret
!= LTTNG_OK
) {
1714 goto consumer_error
;
1717 session
->consumer
->enabled
= 1;
1722 session_destroy(session
);
1729 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1731 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1734 struct ltt_ust_session
*usess
;
1735 struct ltt_kernel_session
*ksess
;
1740 usess
= session
->ust_session
;
1741 ksess
= session
->kernel_session
;
1743 /* Clean kernel session teardown */
1744 kernel_destroy_session(ksess
);
1746 /* UST session teardown */
1748 /* Close any relayd session */
1749 consumer_output_send_destroy_relayd(usess
->consumer
);
1751 /* Destroy every UST application related to this session. */
1752 ret
= ust_app_destroy_trace_all(usess
);
1754 ERR("Error in ust_app_destroy_trace_all");
1757 /* Clean up the rest. */
1758 trace_ust_destroy_session(usess
);
1762 * Must notify the kernel thread here to update it's poll set in order to
1763 * remove the channel(s)' fd just destroyed.
1765 ret
= notify_thread_pipe(wpipe
);
1767 PERROR("write kernel poll pipe");
1770 ret
= session_destroy(session
);
1776 * Command LTTNG_CALIBRATE processed by the client thread.
1778 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1783 case LTTNG_DOMAIN_KERNEL
:
1785 struct lttng_kernel_calibrate kcalibrate
;
1787 kcalibrate
.type
= calibrate
->type
;
1788 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1790 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1795 case LTTNG_DOMAIN_UST
:
1797 struct lttng_ust_calibrate ucalibrate
;
1799 ucalibrate
.type
= calibrate
->type
;
1800 ret
= ust_app_calibrate_glb(&ucalibrate
);
1802 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1808 ret
= LTTNG_ERR_UND
;
1819 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1821 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1822 const char *sock_path
, struct consumer_data
*cdata
)
1825 struct consumer_socket
*socket
;
1832 case LTTNG_DOMAIN_KERNEL
:
1834 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1838 /* Can't register a consumer if there is already one */
1839 if (ksess
->consumer_fds_sent
!= 0) {
1840 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1844 sock
= lttcomm_connect_unix_sock(sock_path
);
1846 ret
= LTTNG_ERR_CONNECT_FAIL
;
1850 socket
= consumer_allocate_socket(sock
);
1851 if (socket
== NULL
) {
1854 PERROR("close register consumer");
1856 ret
= LTTNG_ERR_FATAL
;
1860 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1861 if (socket
->lock
== NULL
) {
1862 PERROR("zmalloc pthread mutex");
1863 ret
= LTTNG_ERR_FATAL
;
1866 pthread_mutex_init(socket
->lock
, NULL
);
1867 socket
->registered
= 1;
1870 consumer_add_socket(socket
, ksess
->consumer
);
1873 pthread_mutex_lock(&cdata
->pid_mutex
);
1875 pthread_mutex_unlock(&cdata
->pid_mutex
);
1880 /* TODO: Userspace tracing */
1881 ret
= LTTNG_ERR_UND
;
1892 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1894 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1895 struct lttng_domain
**domains
)
1900 if (session
->kernel_session
!= NULL
) {
1901 DBG3("Listing domains found kernel domain");
1905 if (session
->ust_session
!= NULL
) {
1906 DBG3("Listing domains found UST global domain");
1910 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1911 if (*domains
== NULL
) {
1912 ret
= LTTNG_ERR_FATAL
;
1916 if (session
->kernel_session
!= NULL
) {
1917 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1921 if (session
->ust_session
!= NULL
) {
1922 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1923 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
1930 /* Return negative value to differentiate return code */
1936 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1938 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1939 struct lttng_channel
**channels
)
1942 ssize_t nb_chan
= 0;
1945 case LTTNG_DOMAIN_KERNEL
:
1946 if (session
->kernel_session
!= NULL
) {
1947 nb_chan
= session
->kernel_session
->channel_count
;
1949 DBG3("Number of kernel channels %zd", nb_chan
);
1951 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1954 case LTTNG_DOMAIN_UST
:
1955 if (session
->ust_session
!= NULL
) {
1956 nb_chan
= lttng_ht_get_count(
1957 session
->ust_session
->domain_global
.channels
);
1959 DBG3("Number of UST global channels %zd", nb_chan
);
1961 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1966 ret
= LTTNG_ERR_UND
;
1971 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
1972 if (*channels
== NULL
) {
1973 ret
= LTTNG_ERR_FATAL
;
1977 list_lttng_channels(domain
, session
, *channels
);
1980 /* Ret value was set in the domain switch case */
1987 /* Return negative value to differentiate return code */
1992 * Command LTTNG_LIST_EVENTS processed by the client thread.
1994 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
1995 char *channel_name
, struct lttng_event
**events
)
1998 ssize_t nb_event
= 0;
2001 case LTTNG_DOMAIN_KERNEL
:
2002 if (session
->kernel_session
!= NULL
) {
2003 nb_event
= list_lttng_kernel_events(channel_name
,
2004 session
->kernel_session
, events
);
2007 case LTTNG_DOMAIN_UST
:
2009 if (session
->ust_session
!= NULL
) {
2010 nb_event
= list_lttng_ust_global_events(channel_name
,
2011 &session
->ust_session
->domain_global
, events
);
2016 ret
= LTTNG_ERR_UND
;
2023 /* Return negative value to differentiate return code */
2028 * Using the session list, filled a lttng_session array to send back to the
2029 * client for session listing.
2031 * The session list lock MUST be acquired before calling this function. Use
2032 * session_lock_list() and session_unlock_list().
2034 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2039 struct ltt_session
*session
;
2040 struct ltt_session_list
*list
= session_get_list();
2042 DBG("Getting all available session for UID %d GID %d",
2045 * Iterate over session list and append data after the control struct in
2048 cds_list_for_each_entry(session
, &list
->head
, list
) {
2050 * Only list the sessions the user can control.
2052 if (!session_access_ok(session
, uid
, gid
)) {
2056 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2057 struct ltt_ust_session
*usess
= session
->ust_session
;
2059 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2060 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2061 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2062 ret
= build_network_session_path(sessions
[i
].path
,
2063 sizeof(session
[i
].path
), session
);
2065 ret
= snprintf(sessions
[i
].path
, sizeof(session
[i
].path
), "%s",
2066 session
->consumer
->dst
.trace_path
);
2069 PERROR("snprintf session path");
2073 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2074 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2075 sessions
[i
].enabled
= session
->enabled
;
2081 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2082 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2084 int cmd_data_pending(struct ltt_session
*session
)
2087 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2088 struct ltt_ust_session
*usess
= session
->ust_session
;
2092 /* Session MUST be stopped to ask for data availability. */
2093 if (session
->enabled
) {
2094 ret
= LTTNG_ERR_SESSION_STARTED
;
2098 if (ksess
&& ksess
->consumer
) {
2099 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2101 /* Data is still being extracted for the kernel. */
2106 if (usess
&& usess
->consumer
) {
2107 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2109 /* Data is still being extracted for the kernel. */
2114 /* Data is ready to be read by a viewer */
2122 * Init command subsystem.
2127 * Set network sequence index to 1 for streams to match a relayd
2128 * socket on the consumer side.
2130 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
2131 relayd_net_seq_idx
= 1;
2132 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
2134 DBG("Command subsystem initialized");