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 consumer_output
*output
,
482 const char *session_name
, struct lttng_uri
*uri
,
483 struct lttcomm_sock
**relayd_sock
)
486 struct lttcomm_sock
*sock
;
488 /* Create socket object from URI */
489 sock
= lttcomm_alloc_sock_from_uri(uri
);
491 ret
= LTTNG_ERR_FATAL
;
495 ret
= lttcomm_create_sock(sock
);
497 ret
= LTTNG_ERR_FATAL
;
502 * Connect to relayd so we can proceed with a session creation. This call
503 * can possibly block for an arbitrary amount of time to set the health
504 * state to be in poll execution.
507 ret
= relayd_connect(sock
);
510 ERR("Unable to reach lttng-relayd");
511 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
515 /* Create socket for control stream. */
516 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
517 DBG3("Creating relayd stream socket from URI");
519 /* Check relayd version */
520 ret
= relayd_version_check(sock
, RELAYD_VERSION_COMM_MAJOR
,
521 RELAYD_VERSION_COMM_MINOR
);
523 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
526 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
527 DBG3("Creating relayd data socket from URI");
529 /* Command is not valid */
530 ERR("Relayd invalid stream type: %d", uri
->stype
);
531 ret
= LTTNG_ERR_INVALID
;
541 (void) relayd_close(sock
);
545 lttcomm_destroy_sock(sock
);
552 * Connect to the relayd using URI and send the socket to the right consumer.
554 static int send_consumer_relayd_socket(int domain
, struct ltt_session
*session
,
555 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
556 struct consumer_socket
*consumer_sock
)
559 struct lttcomm_sock
*sock
= NULL
;
561 /* Connect to relayd and make version check if uri is the control. */
562 ret
= create_connect_relayd(consumer
, session
->name
, relayd_uri
, &sock
);
563 if (ret
!= LTTNG_OK
) {
567 /* If the control socket is connected, network session is ready */
568 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
569 session
->net_handle
= 1;
572 /* Set the network sequence index if not set. */
573 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
574 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
576 * Increment net_seq_idx because we are about to transfer the
577 * new relayd socket to the consumer.
578 * Assign unique key so the consumer can match streams.
580 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
581 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
584 /* Send relayd socket to consumer. */
585 ret
= consumer_send_relayd_socket(consumer_sock
, sock
,
586 consumer
, relayd_uri
->stype
, session
->id
);
588 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
592 /* Flag that the corresponding socket was sent. */
593 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
594 consumer_sock
->control_sock_sent
= 1;
595 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
596 consumer_sock
->data_sock_sent
= 1;
602 * Close socket which was dup on the consumer side. The session daemon does
603 * NOT keep track of the relayd socket(s) once transfer to the consumer.
608 (void) relayd_close(sock
);
609 lttcomm_destroy_sock(sock
);
612 if (ret
!= LTTNG_OK
) {
614 * On error, nullify the consumer sequence index so streams are not
615 * associated with it once sent to the consumer.
617 uatomic_set(&consumer
->net_seq_index
, -1);
624 * Send both relayd sockets to a specific consumer and domain. This is a
625 * helper function to facilitate sending the information to the consumer for a
628 static int send_consumer_relayd_sockets(int domain
,
629 struct ltt_session
*session
, struct consumer_output
*consumer
,
630 struct consumer_socket
*sock
)
637 /* Sending control relayd socket. */
638 if (!sock
->control_sock_sent
) {
639 ret
= send_consumer_relayd_socket(domain
, session
,
640 &consumer
->dst
.net
.control
, consumer
, sock
);
641 if (ret
!= LTTNG_OK
) {
646 /* Sending data relayd socket. */
647 if (!sock
->data_sock_sent
) {
648 ret
= send_consumer_relayd_socket(domain
, session
,
649 &consumer
->dst
.net
.data
, consumer
, sock
);
650 if (ret
!= LTTNG_OK
) {
660 * Setup relayd connections for a tracing session. First creates the socket to
661 * the relayd and send them to the right domain consumer. Consumer type MUST be
664 int cmd_setup_relayd(struct ltt_session
*session
)
667 struct ltt_ust_session
*usess
;
668 struct ltt_kernel_session
*ksess
;
669 struct consumer_socket
*socket
;
670 struct lttng_ht_iter iter
;
674 usess
= session
->ust_session
;
675 ksess
= session
->kernel_session
;
677 DBG("Setting relayd for session %s", session
->name
);
681 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
682 && usess
->consumer
->enabled
) {
683 /* For each consumer socket, send relayd sockets */
684 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
686 /* Code flow error */
687 assert(socket
->fd
>= 0);
689 pthread_mutex_lock(socket
->lock
);
690 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
,
691 usess
->consumer
, socket
);
692 pthread_mutex_unlock(socket
->lock
);
693 if (ret
!= LTTNG_OK
) {
699 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
700 && ksess
->consumer
->enabled
) {
701 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
703 /* Code flow error */
704 assert(socket
->fd
>= 0);
706 pthread_mutex_lock(socket
->lock
);
707 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
,
708 ksess
->consumer
, socket
);
709 pthread_mutex_unlock(socket
->lock
);
710 if (ret
!= LTTNG_OK
) {
722 * Start a kernel session by opening all necessary streams.
724 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
727 struct ltt_kernel_channel
*kchan
;
729 /* Open kernel metadata */
730 if (ksess
->metadata
== NULL
) {
731 ret
= kernel_open_metadata(ksess
);
733 ret
= LTTNG_ERR_KERN_META_FAIL
;
738 /* Open kernel metadata stream */
739 if (ksess
->metadata_stream_fd
< 0) {
740 ret
= kernel_open_metadata_stream(ksess
);
742 ERR("Kernel create metadata stream failed");
743 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
748 /* For each channel */
749 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
750 if (kchan
->stream_count
== 0) {
751 ret
= kernel_open_channel_stream(kchan
);
753 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
756 /* Update the stream global counter */
757 ksess
->stream_count_global
+= ret
;
761 /* Setup kernel consumer socket and send fds to it */
762 ret
= init_kernel_tracing(ksess
);
764 ret
= LTTNG_ERR_KERN_START_FAIL
;
768 /* This start the kernel tracing */
769 ret
= kernel_start_session(ksess
);
771 ret
= LTTNG_ERR_KERN_START_FAIL
;
775 /* Quiescent wait after starting trace */
776 kernel_wait_quiescent(kernel_tracer_fd
);
787 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
789 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
793 struct ltt_ust_session
*usess
;
795 usess
= session
->ust_session
;
800 case LTTNG_DOMAIN_KERNEL
:
802 ret
= channel_kernel_disable(session
->kernel_session
,
804 if (ret
!= LTTNG_OK
) {
808 kernel_wait_quiescent(kernel_tracer_fd
);
811 case LTTNG_DOMAIN_UST
:
813 struct ltt_ust_channel
*uchan
;
814 struct lttng_ht
*chan_ht
;
816 chan_ht
= usess
->domain_global
.channels
;
818 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
820 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
824 ret
= channel_ust_disable(usess
, uchan
);
825 if (ret
!= LTTNG_OK
) {
831 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
832 case LTTNG_DOMAIN_UST_EXEC_NAME
:
833 case LTTNG_DOMAIN_UST_PID
:
836 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
848 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
850 * The wpipe arguments is used as a notifier for the kernel thread.
852 int cmd_enable_channel(struct ltt_session
*session
,
853 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
856 struct ltt_ust_session
*usess
= session
->ust_session
;
857 struct lttng_ht
*chan_ht
;
863 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
867 switch (domain
->type
) {
868 case LTTNG_DOMAIN_KERNEL
:
870 struct ltt_kernel_channel
*kchan
;
872 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
873 session
->kernel_session
);
875 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
877 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
880 if (ret
!= LTTNG_OK
) {
884 kernel_wait_quiescent(kernel_tracer_fd
);
887 * If the session was previously started, start as well this newly
888 * created kernel session so the events/channels enabled *after* the
889 * start actually work.
891 if (session
->started
&& !session
->kernel_session
->started
) {
892 ret
= start_kernel_session(session
->kernel_session
, wpipe
);
893 if (ret
!= LTTNG_OK
) {
899 case LTTNG_DOMAIN_UST
:
901 struct ltt_ust_channel
*uchan
;
903 chan_ht
= usess
->domain_global
.channels
;
905 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
907 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
909 ret
= channel_ust_enable(usess
, uchan
);
912 /* Start the UST session if the session was already started. */
913 if (session
->started
&& !usess
->start_trace
) {
914 ret
= ust_app_start_trace_all(usess
);
916 ret
= LTTNG_ERR_UST_START_FAIL
;
920 usess
->start_trace
= 1;
925 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
936 * Command LTTNG_DISABLE_EVENT processed by the client thread.
938 int cmd_disable_event(struct ltt_session
*session
, int domain
,
939 char *channel_name
, char *event_name
)
946 case LTTNG_DOMAIN_KERNEL
:
948 struct ltt_kernel_channel
*kchan
;
949 struct ltt_kernel_session
*ksess
;
951 ksess
= session
->kernel_session
;
953 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
955 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
959 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
960 if (ret
!= LTTNG_OK
) {
964 kernel_wait_quiescent(kernel_tracer_fd
);
967 case LTTNG_DOMAIN_UST
:
969 struct ltt_ust_channel
*uchan
;
970 struct ltt_ust_session
*usess
;
972 usess
= session
->ust_session
;
974 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
977 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
981 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
982 if (ret
!= LTTNG_OK
) {
986 DBG3("Disable UST event %s in channel %s completed", event_name
,
991 case LTTNG_DOMAIN_UST_EXEC_NAME
:
992 case LTTNG_DOMAIN_UST_PID
:
993 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1008 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1010 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
1018 case LTTNG_DOMAIN_KERNEL
:
1020 struct ltt_kernel_session
*ksess
;
1021 struct ltt_kernel_channel
*kchan
;
1023 ksess
= session
->kernel_session
;
1025 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1026 if (kchan
== NULL
) {
1027 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1031 ret
= event_kernel_disable_all(kchan
);
1032 if (ret
!= LTTNG_OK
) {
1036 kernel_wait_quiescent(kernel_tracer_fd
);
1039 case LTTNG_DOMAIN_UST
:
1041 struct ltt_ust_session
*usess
;
1042 struct ltt_ust_channel
*uchan
;
1044 usess
= session
->ust_session
;
1046 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1048 if (uchan
== NULL
) {
1049 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1053 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1058 DBG3("Disable all UST events in channel %s completed", channel_name
);
1063 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1064 case LTTNG_DOMAIN_UST_PID
:
1065 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1068 ret
= LTTNG_ERR_UND
;
1080 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1082 int cmd_add_context(struct ltt_session
*session
, int domain
,
1083 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1088 case LTTNG_DOMAIN_KERNEL
:
1089 assert(session
->kernel_session
);
1091 if (session
->kernel_session
->channel_count
== 0) {
1092 /* Create default channel */
1093 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1094 if (ret
!= LTTNG_OK
) {
1099 /* Add kernel context to kernel tracer */
1100 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1101 if (ret
!= LTTNG_OK
) {
1105 case LTTNG_DOMAIN_UST
:
1107 struct ltt_ust_session
*usess
= session
->ust_session
;
1110 unsigned int chan_count
=
1111 lttng_ht_get_count(usess
->domain_global
.channels
);
1112 if (chan_count
== 0) {
1113 struct lttng_channel
*attr
;
1114 /* Create default channel */
1115 attr
= channel_new_default_attr(domain
);
1117 ret
= LTTNG_ERR_FATAL
;
1121 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1122 if (ret
!= LTTNG_OK
) {
1129 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1130 if (ret
!= LTTNG_OK
) {
1136 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1137 case LTTNG_DOMAIN_UST_PID
:
1138 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1141 ret
= LTTNG_ERR_UND
;
1152 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1154 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1155 char *channel_name
, struct lttng_event
*event
,
1156 struct lttng_filter_bytecode
*filter
, int wpipe
)
1158 int ret
, channel_created
= 0;
1159 struct lttng_channel
*attr
;
1163 assert(channel_name
);
1167 switch (domain
->type
) {
1168 case LTTNG_DOMAIN_KERNEL
:
1170 struct ltt_kernel_channel
*kchan
;
1172 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1173 session
->kernel_session
);
1174 if (kchan
== NULL
) {
1175 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
);
1177 ret
= LTTNG_ERR_FATAL
;
1180 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1182 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1183 if (ret
!= LTTNG_OK
) {
1189 channel_created
= 1;
1192 /* Get the newly created kernel channel pointer */
1193 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1194 session
->kernel_session
);
1195 if (kchan
== NULL
) {
1196 /* This sould not happen... */
1197 ret
= LTTNG_ERR_FATAL
;
1201 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1202 if (ret
!= LTTNG_OK
) {
1203 if (channel_created
) {
1204 /* Let's not leak a useless channel. */
1205 kernel_destroy_channel(kchan
);
1210 kernel_wait_quiescent(kernel_tracer_fd
);
1213 case LTTNG_DOMAIN_UST
:
1215 struct ltt_ust_channel
*uchan
;
1216 struct ltt_ust_session
*usess
= session
->ust_session
;
1220 /* Get channel from global UST domain */
1221 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1223 if (uchan
== NULL
) {
1224 /* Create default channel */
1225 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
);
1227 ret
= LTTNG_ERR_FATAL
;
1230 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1232 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1233 if (ret
!= LTTNG_OK
) {
1239 /* Get the newly created channel reference back */
1240 uchan
= trace_ust_find_channel_by_name(
1241 usess
->domain_global
.channels
, channel_name
);
1245 /* At this point, the session and channel exist on the tracer */
1246 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
, filter
);
1247 if (ret
!= LTTNG_OK
) {
1253 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1254 case LTTNG_DOMAIN_UST_PID
:
1255 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1258 ret
= LTTNG_ERR_UND
;
1270 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1272 int cmd_enable_event_all(struct ltt_session
*session
,
1273 struct lttng_domain
*domain
, char *channel_name
, int event_type
,
1274 struct lttng_filter_bytecode
*filter
, int wpipe
)
1277 struct lttng_channel
*attr
;
1280 assert(channel_name
);
1284 switch (domain
->type
) {
1285 case LTTNG_DOMAIN_KERNEL
:
1287 struct ltt_kernel_channel
*kchan
;
1289 assert(session
->kernel_session
);
1291 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1292 session
->kernel_session
);
1293 if (kchan
== NULL
) {
1294 /* Create default channel */
1295 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
);
1297 ret
= LTTNG_ERR_FATAL
;
1300 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1302 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1303 if (ret
!= LTTNG_OK
) {
1309 /* Get the newly created kernel channel pointer */
1310 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1311 session
->kernel_session
);
1315 switch (event_type
) {
1316 case LTTNG_EVENT_SYSCALL
:
1317 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1319 case LTTNG_EVENT_TRACEPOINT
:
1321 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1322 * events already registered to the channel.
1324 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1326 case LTTNG_EVENT_ALL
:
1327 /* Enable syscalls and tracepoints */
1328 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1331 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1335 /* Manage return value */
1336 if (ret
!= LTTNG_OK
) {
1338 * On error, cmd_enable_channel call will take care of destroying
1339 * the created channel if it was needed.
1344 kernel_wait_quiescent(kernel_tracer_fd
);
1347 case LTTNG_DOMAIN_UST
:
1349 struct ltt_ust_channel
*uchan
;
1350 struct ltt_ust_session
*usess
= session
->ust_session
;
1354 /* Get channel from global UST domain */
1355 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1357 if (uchan
== NULL
) {
1358 /* Create default channel */
1359 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
);
1361 ret
= LTTNG_ERR_FATAL
;
1364 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1366 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1367 if (ret
!= LTTNG_OK
) {
1373 /* Get the newly created channel reference back */
1374 uchan
= trace_ust_find_channel_by_name(
1375 usess
->domain_global
.channels
, channel_name
);
1379 /* At this point, the session and channel exist on the tracer */
1381 switch (event_type
) {
1382 case LTTNG_EVENT_ALL
:
1383 case LTTNG_EVENT_TRACEPOINT
:
1384 ret
= event_ust_enable_all_tracepoints(usess
, uchan
, filter
);
1385 if (ret
!= LTTNG_OK
) {
1390 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1394 /* Manage return value */
1395 if (ret
!= LTTNG_OK
) {
1402 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1403 case LTTNG_DOMAIN_UST_PID
:
1404 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1407 ret
= LTTNG_ERR_UND
;
1420 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1422 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1425 ssize_t nb_events
= 0;
1428 case LTTNG_DOMAIN_KERNEL
:
1429 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1430 if (nb_events
< 0) {
1431 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1435 case LTTNG_DOMAIN_UST
:
1436 nb_events
= ust_app_list_events(events
);
1437 if (nb_events
< 0) {
1438 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1443 ret
= LTTNG_ERR_UND
;
1450 /* Return negative value to differentiate return code */
1455 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1457 ssize_t
cmd_list_tracepoint_fields(int domain
,
1458 struct lttng_event_field
**fields
)
1461 ssize_t nb_fields
= 0;
1464 case LTTNG_DOMAIN_UST
:
1465 nb_fields
= ust_app_list_event_fields(fields
);
1466 if (nb_fields
< 0) {
1467 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1471 case LTTNG_DOMAIN_KERNEL
:
1472 default: /* fall-through */
1473 ret
= LTTNG_ERR_UND
;
1480 /* Return negative value to differentiate return code */
1485 * Command LTTNG_START_TRACE processed by the client thread.
1487 int cmd_start_trace(struct ltt_session
*session
)
1490 struct ltt_kernel_session
*ksession
;
1491 struct ltt_ust_session
*usess
;
1495 /* Ease our life a bit ;) */
1496 ksession
= session
->kernel_session
;
1497 usess
= session
->ust_session
;
1499 if (session
->enabled
) {
1500 /* Already started. */
1501 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1505 session
->enabled
= 1;
1507 /* Kernel tracing */
1508 if (ksession
!= NULL
) {
1509 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1510 if (ret
!= LTTNG_OK
) {
1515 /* Flag session that trace should start automatically */
1517 usess
->start_trace
= 1;
1519 ret
= ust_app_start_trace_all(usess
);
1521 ret
= LTTNG_ERR_UST_START_FAIL
;
1526 session
->started
= 1;
1535 * Command LTTNG_STOP_TRACE processed by the client thread.
1537 int cmd_stop_trace(struct ltt_session
*session
)
1540 struct ltt_kernel_channel
*kchan
;
1541 struct ltt_kernel_session
*ksession
;
1542 struct ltt_ust_session
*usess
;
1547 ksession
= session
->kernel_session
;
1548 usess
= session
->ust_session
;
1550 if (!session
->enabled
) {
1551 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1555 session
->enabled
= 0;
1559 DBG("Stop kernel tracing");
1561 /* Flush metadata if exist */
1562 if (ksession
->metadata_stream_fd
>= 0) {
1563 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1565 ERR("Kernel metadata flush failed");
1569 /* Flush all buffers before stopping */
1570 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1571 ret
= kernel_flush_buffer(kchan
);
1573 ERR("Kernel flush buffer error");
1577 ret
= kernel_stop_session(ksession
);
1579 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1583 kernel_wait_quiescent(kernel_tracer_fd
);
1585 ksession
->started
= 0;
1589 usess
->start_trace
= 0;
1591 ret
= ust_app_stop_trace_all(usess
);
1593 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1598 session
->started
= 0;
1607 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1609 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1610 size_t nb_uri
, struct lttng_uri
*uris
)
1613 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1614 struct ltt_ust_session
*usess
= session
->ust_session
;
1615 struct consumer_output
*consumer
= NULL
;
1621 /* Can't enable consumer after session started. */
1622 if (session
->enabled
) {
1623 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1628 * This case switch makes sure the domain session has a temporary consumer
1629 * so the URL can be set.
1633 /* Code flow error. A session MUST always have a consumer object */
1634 assert(session
->consumer
);
1636 * The URL will be added to the tracing session consumer instead of a
1637 * specific domain consumer.
1639 consumer
= session
->consumer
;
1641 case LTTNG_DOMAIN_KERNEL
:
1642 /* Code flow error if we don't have a kernel session here. */
1644 assert(ksess
->consumer
);
1645 consumer
= ksess
->consumer
;
1647 case LTTNG_DOMAIN_UST
:
1648 /* Code flow error if we don't have a kernel session here. */
1650 assert(usess
->consumer
);
1651 consumer
= usess
->consumer
;
1655 for (i
= 0; i
< nb_uri
; i
++) {
1656 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1670 * Command LTTNG_CREATE_SESSION processed by the client thread.
1672 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1673 size_t nb_uri
, lttng_sock_cred
*creds
)
1677 struct ltt_session
*session
;
1681 /* No URIs is not possible. */
1683 ret
= LTTNG_ERR_SESSION_FAIL
;
1688 * Verify if the session already exist
1690 * XXX: There is no need for the session lock list here since the caller
1691 * (process_client_msg) is holding it. We might want to change that so a
1692 * single command does not lock the entire session list.
1694 session
= session_find_by_name(name
);
1695 if (session
!= NULL
) {
1696 ret
= LTTNG_ERR_EXIST_SESS
;
1700 /* Create tracing session in the registry */
1701 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
1702 LTTNG_SOCK_GET_GID_CRED(creds
));
1703 if (ret
!= LTTNG_OK
) {
1708 * Get the newly created session pointer back
1710 * XXX: There is no need for the session lock list here since the caller
1711 * (process_client_msg) is holding it. We might want to change that so a
1712 * single command does not lock the entire session list.
1714 session
= session_find_by_name(name
);
1717 /* Create default consumer output for the session not yet created. */
1718 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1719 if (session
->consumer
== NULL
) {
1720 ret
= LTTNG_ERR_FATAL
;
1721 goto consumer_error
;
1724 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1725 if (ret
!= LTTNG_OK
) {
1726 goto consumer_error
;
1729 session
->consumer
->enabled
= 1;
1734 session_destroy(session
);
1741 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1743 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1746 struct ltt_ust_session
*usess
;
1747 struct ltt_kernel_session
*ksess
;
1752 usess
= session
->ust_session
;
1753 ksess
= session
->kernel_session
;
1755 /* Clean kernel session teardown */
1756 kernel_destroy_session(ksess
);
1758 /* UST session teardown */
1760 /* Close any relayd session */
1761 consumer_output_send_destroy_relayd(usess
->consumer
);
1763 /* Destroy every UST application related to this session. */
1764 ret
= ust_app_destroy_trace_all(usess
);
1766 ERR("Error in ust_app_destroy_trace_all");
1769 /* Clean up the rest. */
1770 trace_ust_destroy_session(usess
);
1774 * Must notify the kernel thread here to update it's poll set in order to
1775 * remove the channel(s)' fd just destroyed.
1777 ret
= notify_thread_pipe(wpipe
);
1779 PERROR("write kernel poll pipe");
1782 ret
= session_destroy(session
);
1788 * Command LTTNG_CALIBRATE processed by the client thread.
1790 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1795 case LTTNG_DOMAIN_KERNEL
:
1797 struct lttng_kernel_calibrate kcalibrate
;
1799 kcalibrate
.type
= calibrate
->type
;
1800 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1802 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1807 case LTTNG_DOMAIN_UST
:
1809 struct lttng_ust_calibrate ucalibrate
;
1811 ucalibrate
.type
= calibrate
->type
;
1812 ret
= ust_app_calibrate_glb(&ucalibrate
);
1814 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1820 ret
= LTTNG_ERR_UND
;
1831 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1833 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1834 const char *sock_path
, struct consumer_data
*cdata
)
1837 struct consumer_socket
*socket
;
1844 case LTTNG_DOMAIN_KERNEL
:
1846 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1850 /* Can't register a consumer if there is already one */
1851 if (ksess
->consumer_fds_sent
!= 0) {
1852 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1856 sock
= lttcomm_connect_unix_sock(sock_path
);
1858 ret
= LTTNG_ERR_CONNECT_FAIL
;
1862 socket
= consumer_allocate_socket(sock
);
1863 if (socket
== NULL
) {
1866 PERROR("close register consumer");
1868 ret
= LTTNG_ERR_FATAL
;
1872 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1873 if (socket
->lock
== NULL
) {
1874 PERROR("zmalloc pthread mutex");
1875 ret
= LTTNG_ERR_FATAL
;
1878 pthread_mutex_init(socket
->lock
, NULL
);
1879 socket
->registered
= 1;
1882 consumer_add_socket(socket
, ksess
->consumer
);
1885 pthread_mutex_lock(&cdata
->pid_mutex
);
1887 pthread_mutex_unlock(&cdata
->pid_mutex
);
1892 /* TODO: Userspace tracing */
1893 ret
= LTTNG_ERR_UND
;
1904 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1906 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1907 struct lttng_domain
**domains
)
1912 if (session
->kernel_session
!= NULL
) {
1913 DBG3("Listing domains found kernel domain");
1917 if (session
->ust_session
!= NULL
) {
1918 DBG3("Listing domains found UST global domain");
1922 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1923 if (*domains
== NULL
) {
1924 ret
= LTTNG_ERR_FATAL
;
1928 if (session
->kernel_session
!= NULL
) {
1929 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1933 if (session
->ust_session
!= NULL
) {
1934 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1941 /* Return negative value to differentiate return code */
1947 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1949 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1950 struct lttng_channel
**channels
)
1953 ssize_t nb_chan
= 0;
1956 case LTTNG_DOMAIN_KERNEL
:
1957 if (session
->kernel_session
!= NULL
) {
1958 nb_chan
= session
->kernel_session
->channel_count
;
1960 DBG3("Number of kernel channels %zd", nb_chan
);
1962 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1965 case LTTNG_DOMAIN_UST
:
1966 if (session
->ust_session
!= NULL
) {
1967 nb_chan
= lttng_ht_get_count(
1968 session
->ust_session
->domain_global
.channels
);
1970 DBG3("Number of UST global channels %zd", nb_chan
);
1972 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1977 ret
= LTTNG_ERR_UND
;
1982 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
1983 if (*channels
== NULL
) {
1984 ret
= LTTNG_ERR_FATAL
;
1988 list_lttng_channels(domain
, session
, *channels
);
1991 /* Ret value was set in the domain switch case */
1998 /* Return negative value to differentiate return code */
2003 * Command LTTNG_LIST_EVENTS processed by the client thread.
2005 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2006 char *channel_name
, struct lttng_event
**events
)
2009 ssize_t nb_event
= 0;
2012 case LTTNG_DOMAIN_KERNEL
:
2013 if (session
->kernel_session
!= NULL
) {
2014 nb_event
= list_lttng_kernel_events(channel_name
,
2015 session
->kernel_session
, events
);
2018 case LTTNG_DOMAIN_UST
:
2020 if (session
->ust_session
!= NULL
) {
2021 nb_event
= list_lttng_ust_global_events(channel_name
,
2022 &session
->ust_session
->domain_global
, events
);
2027 ret
= LTTNG_ERR_UND
;
2034 /* Return negative value to differentiate return code */
2039 * Using the session list, filled a lttng_session array to send back to the
2040 * client for session listing.
2042 * The session list lock MUST be acquired before calling this function. Use
2043 * session_lock_list() and session_unlock_list().
2045 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2050 struct ltt_session
*session
;
2051 struct ltt_session_list
*list
= session_get_list();
2053 DBG("Getting all available session for UID %d GID %d",
2056 * Iterate over session list and append data after the control struct in
2059 cds_list_for_each_entry(session
, &list
->head
, list
) {
2061 * Only list the sessions the user can control.
2063 if (!session_access_ok(session
, uid
, gid
)) {
2067 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2068 struct ltt_ust_session
*usess
= session
->ust_session
;
2070 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2071 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2072 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2073 ret
= build_network_session_path(sessions
[i
].path
,
2074 sizeof(session
[i
].path
), session
);
2076 ret
= snprintf(sessions
[i
].path
, sizeof(session
[i
].path
), "%s",
2077 session
->consumer
->dst
.trace_path
);
2080 PERROR("snprintf session path");
2084 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2085 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2086 sessions
[i
].enabled
= session
->enabled
;
2092 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2093 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2095 int cmd_data_pending(struct ltt_session
*session
)
2098 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2099 struct ltt_ust_session
*usess
= session
->ust_session
;
2103 /* Session MUST be stopped to ask for data availability. */
2104 if (session
->enabled
) {
2105 ret
= LTTNG_ERR_SESSION_STARTED
;
2109 if (ksess
&& ksess
->consumer
) {
2110 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2112 /* Data is still being extracted for the kernel. */
2117 if (usess
&& usess
->consumer
) {
2118 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2120 /* Data is still being extracted for the kernel. */
2125 /* Data is ready to be read by a viewer */
2133 * Init command subsystem.
2138 * Set network sequence index to 1 for streams to match a relayd
2139 * socket on the consumer side.
2141 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
2142 relayd_net_seq_idx
= 1;
2143 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
2145 DBG("Command subsystem initialized");