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
,
484 struct ltt_session
*session
)
487 struct lttcomm_sock
*sock
;
490 /* Create socket object from URI */
491 sock
= lttcomm_alloc_sock_from_uri(uri
);
493 ret
= LTTNG_ERR_FATAL
;
497 ret
= lttcomm_create_sock(sock
);
499 ret
= LTTNG_ERR_FATAL
;
504 * Connect to relayd so we can proceed with a session creation. This call
505 * can possibly block for an arbitrary amount of time to set the health
506 * state to be in poll execution.
509 ret
= relayd_connect(sock
);
512 ERR("Unable to reach lttng-relayd");
513 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
517 /* Create socket for control stream. */
518 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
519 DBG3("Creating relayd stream socket from URI");
521 /* Check relayd version */
522 ret
= relayd_version_check(sock
, RELAYD_VERSION_COMM_MAJOR
,
523 RELAYD_VERSION_COMM_MINOR
, &minor
);
525 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
528 session
->major
= RELAYD_VERSION_COMM_MAJOR
;
529 session
->minor
= minor
;
530 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
531 DBG3("Creating relayd data socket from URI");
533 /* Command is not valid */
534 ERR("Relayd invalid stream type: %d", uri
->stype
);
535 ret
= LTTNG_ERR_INVALID
;
545 (void) relayd_close(sock
);
549 lttcomm_destroy_sock(sock
);
556 * Connect to the relayd using URI and send the socket to the right consumer.
558 static int send_consumer_relayd_socket(int domain
, struct ltt_session
*session
,
559 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
560 struct consumer_socket
*consumer_sock
)
563 struct lttcomm_sock
*sock
= NULL
;
565 /* Connect to relayd and make version check if uri is the control. */
566 ret
= create_connect_relayd(consumer
, session
->name
, relayd_uri
,
568 if (ret
!= LTTNG_OK
) {
572 /* If the control socket is connected, network session is ready */
573 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
574 session
->net_handle
= 1;
577 /* Set the network sequence index if not set. */
578 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
579 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
581 * Increment net_seq_idx because we are about to transfer the
582 * new relayd socket to the consumer.
583 * Assign unique key so the consumer can match streams.
585 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
586 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
589 /* Send relayd socket to consumer. */
590 ret
= consumer_send_relayd_socket(consumer_sock
, sock
,
591 consumer
, relayd_uri
->stype
, session
->id
);
593 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
597 /* Flag that the corresponding socket was sent. */
598 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
599 consumer_sock
->control_sock_sent
= 1;
600 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
601 consumer_sock
->data_sock_sent
= 1;
607 * Close socket which was dup on the consumer side. The session daemon does
608 * NOT keep track of the relayd socket(s) once transfer to the consumer.
613 (void) relayd_close(sock
);
614 lttcomm_destroy_sock(sock
);
617 if (ret
!= LTTNG_OK
) {
619 * On error, nullify the consumer sequence index so streams are not
620 * associated with it once sent to the consumer.
622 uatomic_set(&consumer
->net_seq_index
, -1);
629 * Send both relayd sockets to a specific consumer and domain. This is a
630 * helper function to facilitate sending the information to the consumer for a
633 static int send_consumer_relayd_sockets(int domain
,
634 struct ltt_session
*session
, struct consumer_output
*consumer
,
635 struct consumer_socket
*sock
)
642 /* Sending control relayd socket. */
643 if (!sock
->control_sock_sent
) {
644 ret
= send_consumer_relayd_socket(domain
, session
,
645 &consumer
->dst
.net
.control
, consumer
, sock
);
646 if (ret
!= LTTNG_OK
) {
651 /* Sending data relayd socket. */
652 if (!sock
->data_sock_sent
) {
653 ret
= send_consumer_relayd_socket(domain
, session
,
654 &consumer
->dst
.net
.data
, consumer
, sock
);
655 if (ret
!= LTTNG_OK
) {
665 * Setup relayd connections for a tracing session. First creates the socket to
666 * the relayd and send them to the right domain consumer. Consumer type MUST be
669 int cmd_setup_relayd(struct ltt_session
*session
)
672 struct ltt_ust_session
*usess
;
673 struct ltt_kernel_session
*ksess
;
674 struct consumer_socket
*socket
;
675 struct lttng_ht_iter iter
;
679 usess
= session
->ust_session
;
680 ksess
= session
->kernel_session
;
682 DBG("Setting relayd for session %s", session
->name
);
686 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
687 && usess
->consumer
->enabled
) {
688 /* For each consumer socket, send relayd sockets */
689 cds_lfht_for_each_entry(usess
->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_UST
, session
,
696 usess
->consumer
, socket
);
697 pthread_mutex_unlock(socket
->lock
);
698 if (ret
!= LTTNG_OK
) {
704 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
705 && ksess
->consumer
->enabled
) {
706 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
708 /* Code flow error */
709 assert(socket
->fd
>= 0);
711 pthread_mutex_lock(socket
->lock
);
712 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
,
713 ksess
->consumer
, socket
);
714 pthread_mutex_unlock(socket
->lock
);
715 if (ret
!= LTTNG_OK
) {
727 * Start a kernel session by opening all necessary streams.
729 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
732 struct ltt_kernel_channel
*kchan
;
734 /* Open kernel metadata */
735 if (ksess
->metadata
== NULL
) {
736 ret
= kernel_open_metadata(ksess
);
738 ret
= LTTNG_ERR_KERN_META_FAIL
;
743 /* Open kernel metadata stream */
744 if (ksess
->metadata_stream_fd
< 0) {
745 ret
= kernel_open_metadata_stream(ksess
);
747 ERR("Kernel create metadata stream failed");
748 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
753 /* For each channel */
754 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
755 if (kchan
->stream_count
== 0) {
756 ret
= kernel_open_channel_stream(kchan
);
758 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
761 /* Update the stream global counter */
762 ksess
->stream_count_global
+= ret
;
766 /* Setup kernel consumer socket and send fds to it */
767 ret
= init_kernel_tracing(ksess
);
769 ret
= LTTNG_ERR_KERN_START_FAIL
;
773 /* This start the kernel tracing */
774 ret
= kernel_start_session(ksess
);
776 ret
= LTTNG_ERR_KERN_START_FAIL
;
780 /* Quiescent wait after starting trace */
781 kernel_wait_quiescent(kernel_tracer_fd
);
792 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
794 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
798 struct ltt_ust_session
*usess
;
800 usess
= session
->ust_session
;
805 case LTTNG_DOMAIN_KERNEL
:
807 ret
= channel_kernel_disable(session
->kernel_session
,
809 if (ret
!= LTTNG_OK
) {
813 kernel_wait_quiescent(kernel_tracer_fd
);
816 case LTTNG_DOMAIN_UST
:
818 struct ltt_ust_channel
*uchan
;
819 struct lttng_ht
*chan_ht
;
821 chan_ht
= usess
->domain_global
.channels
;
823 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
825 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
829 ret
= channel_ust_disable(usess
, uchan
);
830 if (ret
!= LTTNG_OK
) {
836 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
837 case LTTNG_DOMAIN_UST_EXEC_NAME
:
838 case LTTNG_DOMAIN_UST_PID
:
841 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
853 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
855 * The wpipe arguments is used as a notifier for the kernel thread.
857 int cmd_enable_channel(struct ltt_session
*session
,
858 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
861 struct ltt_ust_session
*usess
= session
->ust_session
;
862 struct lttng_ht
*chan_ht
;
868 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
872 switch (domain
->type
) {
873 case LTTNG_DOMAIN_KERNEL
:
875 struct ltt_kernel_channel
*kchan
;
877 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
878 session
->kernel_session
);
880 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
882 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
885 if (ret
!= LTTNG_OK
) {
889 kernel_wait_quiescent(kernel_tracer_fd
);
892 * If the session was previously started, start as well this newly
893 * created kernel session so the events/channels enabled *after* the
894 * start actually work.
896 if (session
->started
&& !session
->kernel_session
->started
) {
897 ret
= start_kernel_session(session
->kernel_session
, wpipe
);
898 if (ret
!= LTTNG_OK
) {
904 case LTTNG_DOMAIN_UST
:
906 struct ltt_ust_channel
*uchan
;
908 chan_ht
= usess
->domain_global
.channels
;
910 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
912 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
914 ret
= channel_ust_enable(usess
, uchan
);
917 /* Start the UST session if the session was already started. */
918 if (session
->started
&& !usess
->start_trace
) {
919 ret
= ust_app_start_trace_all(usess
);
921 ret
= LTTNG_ERR_UST_START_FAIL
;
925 usess
->start_trace
= 1;
930 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
941 * Command LTTNG_DISABLE_EVENT processed by the client thread.
943 int cmd_disable_event(struct ltt_session
*session
, int domain
,
944 char *channel_name
, char *event_name
)
951 case LTTNG_DOMAIN_KERNEL
:
953 struct ltt_kernel_channel
*kchan
;
954 struct ltt_kernel_session
*ksess
;
956 ksess
= session
->kernel_session
;
958 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
960 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
964 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
965 if (ret
!= LTTNG_OK
) {
969 kernel_wait_quiescent(kernel_tracer_fd
);
972 case LTTNG_DOMAIN_UST
:
974 struct ltt_ust_channel
*uchan
;
975 struct ltt_ust_session
*usess
;
977 usess
= session
->ust_session
;
979 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
982 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
986 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
987 if (ret
!= LTTNG_OK
) {
991 DBG3("Disable UST event %s in channel %s completed", event_name
,
996 case LTTNG_DOMAIN_UST_EXEC_NAME
:
997 case LTTNG_DOMAIN_UST_PID
:
998 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1001 ret
= LTTNG_ERR_UND
;
1013 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1015 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
1023 case LTTNG_DOMAIN_KERNEL
:
1025 struct ltt_kernel_session
*ksess
;
1026 struct ltt_kernel_channel
*kchan
;
1028 ksess
= session
->kernel_session
;
1030 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1031 if (kchan
== NULL
) {
1032 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1036 ret
= event_kernel_disable_all(kchan
);
1037 if (ret
!= LTTNG_OK
) {
1041 kernel_wait_quiescent(kernel_tracer_fd
);
1044 case LTTNG_DOMAIN_UST
:
1046 struct ltt_ust_session
*usess
;
1047 struct ltt_ust_channel
*uchan
;
1049 usess
= session
->ust_session
;
1051 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1053 if (uchan
== NULL
) {
1054 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1058 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1063 DBG3("Disable all UST events in channel %s completed", channel_name
);
1068 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1069 case LTTNG_DOMAIN_UST_PID
:
1070 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1073 ret
= LTTNG_ERR_UND
;
1085 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1087 int cmd_add_context(struct ltt_session
*session
, int domain
,
1088 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1093 case LTTNG_DOMAIN_KERNEL
:
1094 assert(session
->kernel_session
);
1096 if (session
->kernel_session
->channel_count
== 0) {
1097 /* Create default channel */
1098 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1099 if (ret
!= LTTNG_OK
) {
1104 /* Add kernel context to kernel tracer */
1105 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1106 if (ret
!= LTTNG_OK
) {
1110 case LTTNG_DOMAIN_UST
:
1112 struct ltt_ust_session
*usess
= session
->ust_session
;
1115 unsigned int chan_count
=
1116 lttng_ht_get_count(usess
->domain_global
.channels
);
1117 if (chan_count
== 0) {
1118 struct lttng_channel
*attr
;
1119 /* Create default channel */
1120 attr
= channel_new_default_attr(domain
);
1122 ret
= LTTNG_ERR_FATAL
;
1126 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1127 if (ret
!= LTTNG_OK
) {
1134 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1135 if (ret
!= LTTNG_OK
) {
1141 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1142 case LTTNG_DOMAIN_UST_PID
:
1143 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1146 ret
= LTTNG_ERR_UND
;
1157 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1159 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1160 char *channel_name
, struct lttng_event
*event
,
1161 struct lttng_filter_bytecode
*filter
, int wpipe
)
1163 int ret
, channel_created
= 0;
1164 struct lttng_channel
*attr
;
1168 assert(channel_name
);
1172 switch (domain
->type
) {
1173 case LTTNG_DOMAIN_KERNEL
:
1175 struct ltt_kernel_channel
*kchan
;
1177 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1178 session
->kernel_session
);
1179 if (kchan
== NULL
) {
1180 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
);
1182 ret
= LTTNG_ERR_FATAL
;
1185 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1187 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1188 if (ret
!= LTTNG_OK
) {
1194 channel_created
= 1;
1197 /* Get the newly created kernel channel pointer */
1198 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1199 session
->kernel_session
);
1200 if (kchan
== NULL
) {
1201 /* This sould not happen... */
1202 ret
= LTTNG_ERR_FATAL
;
1206 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1207 if (ret
!= LTTNG_OK
) {
1208 if (channel_created
) {
1209 /* Let's not leak a useless channel. */
1210 kernel_destroy_channel(kchan
);
1215 kernel_wait_quiescent(kernel_tracer_fd
);
1218 case LTTNG_DOMAIN_UST
:
1220 struct ltt_ust_channel
*uchan
;
1221 struct ltt_ust_session
*usess
= session
->ust_session
;
1225 /* Get channel from global UST domain */
1226 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1228 if (uchan
== NULL
) {
1229 /* Create default channel */
1230 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
);
1232 ret
= LTTNG_ERR_FATAL
;
1235 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1237 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1238 if (ret
!= LTTNG_OK
) {
1244 /* Get the newly created channel reference back */
1245 uchan
= trace_ust_find_channel_by_name(
1246 usess
->domain_global
.channels
, channel_name
);
1250 /* At this point, the session and channel exist on the tracer */
1251 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
, filter
);
1252 if (ret
!= LTTNG_OK
) {
1258 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1259 case LTTNG_DOMAIN_UST_PID
:
1260 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1263 ret
= LTTNG_ERR_UND
;
1275 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1277 int cmd_enable_event_all(struct ltt_session
*session
,
1278 struct lttng_domain
*domain
, char *channel_name
, int event_type
,
1279 struct lttng_filter_bytecode
*filter
, int wpipe
)
1282 struct lttng_channel
*attr
;
1285 assert(channel_name
);
1289 switch (domain
->type
) {
1290 case LTTNG_DOMAIN_KERNEL
:
1292 struct ltt_kernel_channel
*kchan
;
1294 assert(session
->kernel_session
);
1296 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1297 session
->kernel_session
);
1298 if (kchan
== NULL
) {
1299 /* Create default channel */
1300 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
);
1302 ret
= LTTNG_ERR_FATAL
;
1305 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1307 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1308 if (ret
!= LTTNG_OK
) {
1314 /* Get the newly created kernel channel pointer */
1315 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1316 session
->kernel_session
);
1320 switch (event_type
) {
1321 case LTTNG_EVENT_SYSCALL
:
1322 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1324 case LTTNG_EVENT_TRACEPOINT
:
1326 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1327 * events already registered to the channel.
1329 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1331 case LTTNG_EVENT_ALL
:
1332 /* Enable syscalls and tracepoints */
1333 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1336 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1340 /* Manage return value */
1341 if (ret
!= LTTNG_OK
) {
1343 * On error, cmd_enable_channel call will take care of destroying
1344 * the created channel if it was needed.
1349 kernel_wait_quiescent(kernel_tracer_fd
);
1352 case LTTNG_DOMAIN_UST
:
1354 struct ltt_ust_channel
*uchan
;
1355 struct ltt_ust_session
*usess
= session
->ust_session
;
1359 /* Get channel from global UST domain */
1360 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1362 if (uchan
== NULL
) {
1363 /* Create default channel */
1364 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
);
1366 ret
= LTTNG_ERR_FATAL
;
1369 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1371 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1372 if (ret
!= LTTNG_OK
) {
1378 /* Get the newly created channel reference back */
1379 uchan
= trace_ust_find_channel_by_name(
1380 usess
->domain_global
.channels
, channel_name
);
1384 /* At this point, the session and channel exist on the tracer */
1386 switch (event_type
) {
1387 case LTTNG_EVENT_ALL
:
1388 case LTTNG_EVENT_TRACEPOINT
:
1389 ret
= event_ust_enable_all_tracepoints(usess
, uchan
, filter
);
1390 if (ret
!= LTTNG_OK
) {
1395 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1399 /* Manage return value */
1400 if (ret
!= LTTNG_OK
) {
1407 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1408 case LTTNG_DOMAIN_UST_PID
:
1409 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1412 ret
= LTTNG_ERR_UND
;
1425 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1427 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1430 ssize_t nb_events
= 0;
1433 case LTTNG_DOMAIN_KERNEL
:
1434 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1435 if (nb_events
< 0) {
1436 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1440 case LTTNG_DOMAIN_UST
:
1441 nb_events
= ust_app_list_events(events
);
1442 if (nb_events
< 0) {
1443 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1448 ret
= LTTNG_ERR_UND
;
1455 /* Return negative value to differentiate return code */
1460 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1462 ssize_t
cmd_list_tracepoint_fields(int domain
,
1463 struct lttng_event_field
**fields
)
1466 ssize_t nb_fields
= 0;
1469 case LTTNG_DOMAIN_UST
:
1470 nb_fields
= ust_app_list_event_fields(fields
);
1471 if (nb_fields
< 0) {
1472 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1476 case LTTNG_DOMAIN_KERNEL
:
1477 default: /* fall-through */
1478 ret
= LTTNG_ERR_UND
;
1485 /* Return negative value to differentiate return code */
1490 * Command LTTNG_START_TRACE processed by the client thread.
1492 int cmd_start_trace(struct ltt_session
*session
)
1495 struct ltt_kernel_session
*ksession
;
1496 struct ltt_ust_session
*usess
;
1500 /* Ease our life a bit ;) */
1501 ksession
= session
->kernel_session
;
1502 usess
= session
->ust_session
;
1504 if (session
->enabled
) {
1505 /* Already started. */
1506 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1510 session
->enabled
= 1;
1512 /* Kernel tracing */
1513 if (ksession
!= NULL
) {
1514 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1515 if (ret
!= LTTNG_OK
) {
1520 /* Flag session that trace should start automatically */
1522 usess
->start_trace
= 1;
1524 ret
= ust_app_start_trace_all(usess
);
1526 ret
= LTTNG_ERR_UST_START_FAIL
;
1531 session
->started
= 1;
1540 * Command LTTNG_STOP_TRACE processed by the client thread.
1542 int cmd_stop_trace(struct ltt_session
*session
)
1545 struct ltt_kernel_channel
*kchan
;
1546 struct ltt_kernel_session
*ksession
;
1547 struct ltt_ust_session
*usess
;
1552 ksession
= session
->kernel_session
;
1553 usess
= session
->ust_session
;
1555 if (!session
->enabled
) {
1556 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1560 session
->enabled
= 0;
1564 DBG("Stop kernel tracing");
1566 /* Flush metadata if exist */
1567 if (ksession
->metadata_stream_fd
>= 0) {
1568 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1570 ERR("Kernel metadata flush failed");
1574 /* Flush all buffers before stopping */
1575 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1576 ret
= kernel_flush_buffer(kchan
);
1578 ERR("Kernel flush buffer error");
1582 ret
= kernel_stop_session(ksession
);
1584 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1588 kernel_wait_quiescent(kernel_tracer_fd
);
1590 ksession
->started
= 0;
1594 usess
->start_trace
= 0;
1596 ret
= ust_app_stop_trace_all(usess
);
1598 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1603 session
->started
= 0;
1612 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1614 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1615 size_t nb_uri
, struct lttng_uri
*uris
)
1618 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1619 struct ltt_ust_session
*usess
= session
->ust_session
;
1620 struct consumer_output
*consumer
= NULL
;
1626 /* Can't enable consumer after session started. */
1627 if (session
->enabled
) {
1628 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1633 * This case switch makes sure the domain session has a temporary consumer
1634 * so the URL can be set.
1638 /* Code flow error. A session MUST always have a consumer object */
1639 assert(session
->consumer
);
1641 * The URL will be added to the tracing session consumer instead of a
1642 * specific domain consumer.
1644 consumer
= session
->consumer
;
1646 case LTTNG_DOMAIN_KERNEL
:
1647 /* Code flow error if we don't have a kernel session here. */
1649 assert(ksess
->consumer
);
1650 consumer
= ksess
->consumer
;
1652 case LTTNG_DOMAIN_UST
:
1653 /* Code flow error if we don't have a kernel session here. */
1655 assert(usess
->consumer
);
1656 consumer
= usess
->consumer
;
1660 for (i
= 0; i
< nb_uri
; i
++) {
1661 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1675 * Command LTTNG_CREATE_SESSION processed by the client thread.
1677 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1678 size_t nb_uri
, lttng_sock_cred
*creds
)
1682 struct ltt_session
*session
;
1686 /* No URIs is not possible. */
1688 ret
= LTTNG_ERR_SESSION_FAIL
;
1693 * Verify if the session already exist
1695 * XXX: There is no need for the session lock list here since the caller
1696 * (process_client_msg) is holding it. We might want to change that so a
1697 * single command does not lock the entire session list.
1699 session
= session_find_by_name(name
);
1700 if (session
!= NULL
) {
1701 ret
= LTTNG_ERR_EXIST_SESS
;
1705 /* Create tracing session in the registry */
1706 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
1707 LTTNG_SOCK_GET_GID_CRED(creds
));
1708 if (ret
!= LTTNG_OK
) {
1713 * Get the newly created session pointer back
1715 * XXX: There is no need for the session lock list here since the caller
1716 * (process_client_msg) is holding it. We might want to change that so a
1717 * single command does not lock the entire session list.
1719 session
= session_find_by_name(name
);
1722 /* Create default consumer output for the session not yet created. */
1723 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1724 if (session
->consumer
== NULL
) {
1725 ret
= LTTNG_ERR_FATAL
;
1726 goto consumer_error
;
1729 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1730 if (ret
!= LTTNG_OK
) {
1731 goto consumer_error
;
1734 session
->consumer
->enabled
= 1;
1739 session_destroy(session
);
1746 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1748 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1751 struct ltt_ust_session
*usess
;
1752 struct ltt_kernel_session
*ksess
;
1757 usess
= session
->ust_session
;
1758 ksess
= session
->kernel_session
;
1760 /* Clean kernel session teardown */
1761 kernel_destroy_session(ksess
);
1763 /* UST session teardown */
1765 /* Close any relayd session */
1766 consumer_output_send_destroy_relayd(usess
->consumer
);
1768 /* Destroy every UST application related to this session. */
1769 ret
= ust_app_destroy_trace_all(usess
);
1771 ERR("Error in ust_app_destroy_trace_all");
1774 /* Clean up the rest. */
1775 trace_ust_destroy_session(usess
);
1779 * Must notify the kernel thread here to update it's poll set in order to
1780 * remove the channel(s)' fd just destroyed.
1782 ret
= notify_thread_pipe(wpipe
);
1784 PERROR("write kernel poll pipe");
1787 ret
= session_destroy(session
);
1793 * Command LTTNG_CALIBRATE processed by the client thread.
1795 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1800 case LTTNG_DOMAIN_KERNEL
:
1802 struct lttng_kernel_calibrate kcalibrate
;
1804 kcalibrate
.type
= calibrate
->type
;
1805 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1807 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1812 case LTTNG_DOMAIN_UST
:
1814 struct lttng_ust_calibrate ucalibrate
;
1816 ucalibrate
.type
= calibrate
->type
;
1817 ret
= ust_app_calibrate_glb(&ucalibrate
);
1819 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1825 ret
= LTTNG_ERR_UND
;
1836 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1838 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1839 const char *sock_path
, struct consumer_data
*cdata
)
1842 struct consumer_socket
*socket
;
1849 case LTTNG_DOMAIN_KERNEL
:
1851 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1855 /* Can't register a consumer if there is already one */
1856 if (ksess
->consumer_fds_sent
!= 0) {
1857 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1861 sock
= lttcomm_connect_unix_sock(sock_path
);
1863 ret
= LTTNG_ERR_CONNECT_FAIL
;
1867 socket
= consumer_allocate_socket(sock
);
1868 if (socket
== NULL
) {
1871 PERROR("close register consumer");
1873 ret
= LTTNG_ERR_FATAL
;
1877 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1878 if (socket
->lock
== NULL
) {
1879 PERROR("zmalloc pthread mutex");
1880 ret
= LTTNG_ERR_FATAL
;
1883 pthread_mutex_init(socket
->lock
, NULL
);
1884 socket
->registered
= 1;
1887 consumer_add_socket(socket
, ksess
->consumer
);
1890 pthread_mutex_lock(&cdata
->pid_mutex
);
1892 pthread_mutex_unlock(&cdata
->pid_mutex
);
1897 /* TODO: Userspace tracing */
1898 ret
= LTTNG_ERR_UND
;
1909 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1911 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1912 struct lttng_domain
**domains
)
1917 if (session
->kernel_session
!= NULL
) {
1918 DBG3("Listing domains found kernel domain");
1922 if (session
->ust_session
!= NULL
) {
1923 DBG3("Listing domains found UST global domain");
1927 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1928 if (*domains
== NULL
) {
1929 ret
= LTTNG_ERR_FATAL
;
1933 if (session
->kernel_session
!= NULL
) {
1934 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1938 if (session
->ust_session
!= NULL
) {
1939 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1946 /* Return negative value to differentiate return code */
1952 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1954 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1955 struct lttng_channel
**channels
)
1958 ssize_t nb_chan
= 0;
1961 case LTTNG_DOMAIN_KERNEL
:
1962 if (session
->kernel_session
!= NULL
) {
1963 nb_chan
= session
->kernel_session
->channel_count
;
1965 DBG3("Number of kernel channels %zd", nb_chan
);
1967 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1970 case LTTNG_DOMAIN_UST
:
1971 if (session
->ust_session
!= NULL
) {
1972 nb_chan
= lttng_ht_get_count(
1973 session
->ust_session
->domain_global
.channels
);
1975 DBG3("Number of UST global channels %zd", nb_chan
);
1977 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1982 ret
= LTTNG_ERR_UND
;
1987 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
1988 if (*channels
== NULL
) {
1989 ret
= LTTNG_ERR_FATAL
;
1993 list_lttng_channels(domain
, session
, *channels
);
1996 /* Ret value was set in the domain switch case */
2003 /* Return negative value to differentiate return code */
2008 * Command LTTNG_LIST_EVENTS processed by the client thread.
2010 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2011 char *channel_name
, struct lttng_event
**events
)
2014 ssize_t nb_event
= 0;
2017 case LTTNG_DOMAIN_KERNEL
:
2018 if (session
->kernel_session
!= NULL
) {
2019 nb_event
= list_lttng_kernel_events(channel_name
,
2020 session
->kernel_session
, events
);
2023 case LTTNG_DOMAIN_UST
:
2025 if (session
->ust_session
!= NULL
) {
2026 nb_event
= list_lttng_ust_global_events(channel_name
,
2027 &session
->ust_session
->domain_global
, events
);
2032 ret
= LTTNG_ERR_UND
;
2039 /* Return negative value to differentiate return code */
2044 * Using the session list, filled a lttng_session array to send back to the
2045 * client for session listing.
2047 * The session list lock MUST be acquired before calling this function. Use
2048 * session_lock_list() and session_unlock_list().
2050 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2055 struct ltt_session
*session
;
2056 struct ltt_session_list
*list
= session_get_list();
2058 DBG("Getting all available session for UID %d GID %d",
2061 * Iterate over session list and append data after the control struct in
2064 cds_list_for_each_entry(session
, &list
->head
, list
) {
2066 * Only list the sessions the user can control.
2068 if (!session_access_ok(session
, uid
, gid
)) {
2072 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2073 struct ltt_ust_session
*usess
= session
->ust_session
;
2075 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2076 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2077 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2078 ret
= build_network_session_path(sessions
[i
].path
,
2079 sizeof(session
[i
].path
), session
);
2081 ret
= snprintf(sessions
[i
].path
, sizeof(session
[i
].path
), "%s",
2082 session
->consumer
->dst
.trace_path
);
2085 PERROR("snprintf session path");
2089 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2090 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2091 sessions
[i
].enabled
= session
->enabled
;
2097 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2098 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2100 int cmd_data_pending(struct ltt_session
*session
)
2103 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2104 struct ltt_ust_session
*usess
= session
->ust_session
;
2108 /* Session MUST be stopped to ask for data availability. */
2109 if (session
->enabled
) {
2110 ret
= LTTNG_ERR_SESSION_STARTED
;
2114 if (ksess
&& ksess
->consumer
) {
2115 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2117 /* Data is still being extracted for the kernel. */
2122 if (usess
&& usess
->consumer
) {
2123 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2125 /* Data is still being extracted for the kernel. */
2130 /* Data is ready to be read by a viewer */
2138 * Init command subsystem.
2143 * Set network sequence index to 1 for streams to match a relayd
2144 * socket on the consumer side.
2146 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
2147 relayd_net_seq_idx
= 1;
2148 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
2150 DBG("Command subsystem initialized");