2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #include <urcu/list.h>
21 #include <urcu/uatomic.h>
23 #include <common/defaults.h>
24 #include <common/common.h>
25 #include <common/sessiond-comm/sessiond-comm.h>
26 #include <common/relayd/relayd.h>
32 #include "kernel-consumer.h"
33 #include "lttng-sessiond.h"
39 * Used to keep a unique index for each relayd socket created where this value
40 * is associated with streams on the consumer so it can match the right relayd
43 * This value should be incremented atomically for safety purposes and future
44 * possible concurrent access.
46 static unsigned int relayd_net_seq_idx
;
49 * Create a session path used by list_lttng_sessions for the case that the
50 * session consumer is on the network.
52 static int build_network_session_path(char *dst
, size_t size
,
53 struct ltt_session
*session
)
55 int ret
, kdata_port
, udata_port
;
56 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
57 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
62 memset(tmp_urls
, 0, sizeof(tmp_urls
));
63 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
65 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
67 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
68 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
69 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
72 if (session
->ust_session
&& session
->ust_session
->consumer
) {
73 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
74 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
77 if (uuri
== NULL
&& kuri
== NULL
) {
78 uri
= &session
->consumer
->dst
.net
.control
;
79 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
80 } else if (kuri
&& uuri
) {
81 ret
= uri_compare(kuri
, uuri
);
85 /* Build uuri URL string */
86 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
93 } else if (kuri
&& uuri
== NULL
) {
95 } else if (uuri
&& kuri
== NULL
) {
99 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
105 * Do we have a UST url set. If yes, this means we have both kernel and UST
108 if (*tmp_uurl
!= '\0') {
109 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
110 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
116 /* No kernel URI, use the UST port. */
119 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, dport
);
127 * Fill lttng_channel array of all channels.
129 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
130 struct lttng_channel
*channels
)
133 struct ltt_kernel_channel
*kchan
;
135 DBG("Listing channels for session %s", session
->name
);
138 case LTTNG_DOMAIN_KERNEL
:
139 /* Kernel channels */
140 if (session
->kernel_session
!= NULL
) {
141 cds_list_for_each_entry(kchan
,
142 &session
->kernel_session
->channel_list
.head
, list
) {
143 /* Copy lttng_channel struct to array */
144 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
145 channels
[i
].enabled
= kchan
->enabled
;
150 case LTTNG_DOMAIN_UST
:
152 struct lttng_ht_iter iter
;
153 struct ltt_ust_channel
*uchan
;
156 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
157 &iter
.iter
, uchan
, node
.node
) {
158 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
159 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
160 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
161 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
162 channels
[i
].attr
.switch_timer_interval
=
163 uchan
->attr
.switch_timer_interval
;
164 channels
[i
].attr
.read_timer_interval
=
165 uchan
->attr
.read_timer_interval
;
166 channels
[i
].enabled
= uchan
->enabled
;
167 switch (uchan
->attr
.output
) {
170 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
184 * Create a list of ust global domain events.
186 static int list_lttng_ust_global_events(char *channel_name
,
187 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
190 unsigned int nb_event
= 0;
191 struct lttng_ht_iter iter
;
192 struct lttng_ht_node_str
*node
;
193 struct ltt_ust_channel
*uchan
;
194 struct ltt_ust_event
*uevent
;
195 struct lttng_event
*tmp
;
197 DBG("Listing UST global events for channel %s", channel_name
);
201 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
202 node
= lttng_ht_iter_get_node_str(&iter
);
204 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
208 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
210 nb_event
+= lttng_ht_get_count(uchan
->events
);
217 DBG3("Listing UST global %d events", nb_event
);
219 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
221 ret
= LTTNG_ERR_FATAL
;
225 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
226 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
227 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
228 tmp
[i
].enabled
= uevent
->enabled
;
230 switch (uevent
->attr
.instrumentation
) {
231 case LTTNG_UST_TRACEPOINT
:
232 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
234 case LTTNG_UST_PROBE
:
235 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
237 case LTTNG_UST_FUNCTION
:
238 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
242 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
243 switch (uevent
->attr
.loglevel_type
) {
244 case LTTNG_UST_LOGLEVEL_ALL
:
245 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
247 case LTTNG_UST_LOGLEVEL_RANGE
:
248 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
250 case LTTNG_UST_LOGLEVEL_SINGLE
:
251 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
254 if (uevent
->filter
) {
269 * Fill lttng_event array of all kernel events in the channel.
271 static int list_lttng_kernel_events(char *channel_name
,
272 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
275 unsigned int nb_event
;
276 struct ltt_kernel_event
*event
;
277 struct ltt_kernel_channel
*kchan
;
279 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
281 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
285 nb_event
= kchan
->event_count
;
287 DBG("Listing events for channel %s", kchan
->channel
->name
);
293 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
294 if (*events
== NULL
) {
295 ret
= LTTNG_ERR_FATAL
;
299 /* Kernel channels */
300 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
301 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
302 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
303 (*events
)[i
].enabled
= event
->enabled
;
305 switch (event
->event
->instrumentation
) {
306 case LTTNG_KERNEL_TRACEPOINT
:
307 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
309 case LTTNG_KERNEL_KPROBE
:
310 case LTTNG_KERNEL_KRETPROBE
:
311 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
312 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
313 sizeof(struct lttng_kernel_kprobe
));
315 case LTTNG_KERNEL_FUNCTION
:
316 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
317 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
318 sizeof(struct lttng_kernel_function
));
320 case LTTNG_KERNEL_NOOP
:
321 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
323 case LTTNG_KERNEL_SYSCALL
:
324 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
326 case LTTNG_KERNEL_ALL
:
337 /* Negate the error code to differentiate the size from an error */
342 * Add URI so the consumer output object. Set the correct path depending on the
343 * domain adding the default trace directory.
345 static int add_uri_to_consumer(struct consumer_output
*consumer
,
346 struct lttng_uri
*uri
, int domain
, const char *session_name
)
349 const char *default_trace_dir
;
353 if (consumer
== NULL
) {
354 DBG("No consumer detected. Don't add URI. Stopping.");
355 ret
= LTTNG_ERR_NO_CONSUMER
;
360 case LTTNG_DOMAIN_KERNEL
:
361 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
363 case LTTNG_DOMAIN_UST
:
364 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
368 * This case is possible is we try to add the URI to the global tracing
369 * session consumer object which in this case there is no subdir.
371 default_trace_dir
= "";
374 switch (uri
->dtype
) {
377 DBG2("Setting network URI to consumer");
379 consumer
->type
= CONSUMER_DST_NET
;
381 /* Set URI into consumer output object */
382 ret
= consumer_set_network_uri(consumer
, uri
);
384 ret
= LTTNG_ERR_FATAL
;
386 } else if (ret
== 1) {
388 * URI was the same in the consumer so we do not append the subdir
389 * again so to not duplicate output dir.
394 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
395 ret
= consumer_set_subdir(consumer
, session_name
);
397 ret
= LTTNG_ERR_FATAL
;
402 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
403 /* On a new subdir, reappend the default trace dir. */
404 strncat(consumer
->subdir
, default_trace_dir
,
405 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
406 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
411 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
412 memset(consumer
->dst
.trace_path
, 0,
413 sizeof(consumer
->dst
.trace_path
));
414 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
415 sizeof(consumer
->dst
.trace_path
));
416 /* Append default trace dir */
417 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
418 sizeof(consumer
->dst
.trace_path
) -
419 strlen(consumer
->dst
.trace_path
) - 1);
420 /* Flag consumer as local. */
421 consumer
->type
= CONSUMER_DST_LOCAL
;
430 * Init tracing by creating trace directory and sending fds kernel consumer.
432 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
435 struct lttng_ht_iter iter
;
436 struct consumer_socket
*socket
;
442 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
443 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
445 /* Code flow error */
446 assert(socket
->fd
>= 0);
448 pthread_mutex_lock(socket
->lock
);
449 ret
= kernel_consumer_send_session(socket
, session
);
450 pthread_mutex_unlock(socket
->lock
);
452 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
464 * Create a socket to the relayd using the URI.
466 * On success, the relayd_sock pointer is set to the created socket.
467 * Else, it's stays untouched and a lttcomm error code is returned.
469 static int create_connect_relayd(struct consumer_output
*output
,
470 const char *session_name
, struct lttng_uri
*uri
,
471 struct lttcomm_sock
**relayd_sock
)
474 struct lttcomm_sock
*sock
;
476 /* Create socket object from URI */
477 sock
= lttcomm_alloc_sock_from_uri(uri
);
479 ret
= LTTNG_ERR_FATAL
;
483 ret
= lttcomm_create_sock(sock
);
485 ret
= LTTNG_ERR_FATAL
;
490 * Connect to relayd so we can proceed with a session creation. This call
491 * can possibly block for an arbitrary amount of time to set the health
492 * state to be in poll execution.
495 ret
= relayd_connect(sock
);
498 ERR("Unable to reach lttng-relayd");
499 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
503 /* Create socket for control stream. */
504 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
505 DBG3("Creating relayd stream socket from URI");
507 /* Check relayd version */
508 ret
= relayd_version_check(sock
, RELAYD_VERSION_COMM_MAJOR
,
509 RELAYD_VERSION_COMM_MINOR
);
511 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
514 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
515 DBG3("Creating relayd data socket from URI");
517 /* Command is not valid */
518 ERR("Relayd invalid stream type: %d", uri
->stype
);
519 ret
= LTTNG_ERR_INVALID
;
529 (void) relayd_close(sock
);
533 lttcomm_destroy_sock(sock
);
540 * Connect to the relayd using URI and send the socket to the right consumer.
542 static int send_consumer_relayd_socket(int domain
, struct ltt_session
*session
,
543 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
544 struct consumer_socket
*consumer_sock
)
547 struct lttcomm_sock
*sock
= NULL
;
549 /* Connect to relayd and make version check if uri is the control. */
550 ret
= create_connect_relayd(consumer
, session
->name
, relayd_uri
, &sock
);
551 if (ret
!= LTTNG_OK
) {
555 /* If the control socket is connected, network session is ready */
556 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
557 session
->net_handle
= 1;
560 /* Set the network sequence index if not set. */
561 if (consumer
->net_seq_index
== -1) {
563 * Increment net_seq_idx because we are about to transfer the
564 * new relayd socket to the consumer.
566 uatomic_inc(&relayd_net_seq_idx
);
567 /* Assign unique key so the consumer can match streams */
568 uatomic_set(&consumer
->net_seq_index
,
569 uatomic_read(&relayd_net_seq_idx
));
572 /* Send relayd socket to consumer. */
573 ret
= consumer_send_relayd_socket(consumer_sock
, sock
,
574 consumer
, relayd_uri
->stype
, session
->id
);
576 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
580 /* Flag that the corresponding socket was sent. */
581 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
582 consumer_sock
->control_sock_sent
= 1;
583 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
584 consumer_sock
->data_sock_sent
= 1;
590 * Close socket which was dup on the consumer side. The session daemon does
591 * NOT keep track of the relayd socket(s) once transfer to the consumer.
596 (void) relayd_close(sock
);
597 lttcomm_destroy_sock(sock
);
600 if (ret
!= LTTNG_OK
) {
602 * On error, nullify the consumer sequence index so streams are not
603 * associated with it once sent to the consumer.
605 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 DBG2("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
, domain
, 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 int domain
, struct lttng_channel
*attr
, int wpipe
)
844 struct ltt_ust_session
*usess
= session
->ust_session
;
845 struct lttng_ht
*chan_ht
;
850 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
855 case LTTNG_DOMAIN_KERNEL
:
857 struct ltt_kernel_channel
*kchan
;
859 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
860 session
->kernel_session
);
862 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
864 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
867 if (ret
!= LTTNG_OK
) {
871 kernel_wait_quiescent(kernel_tracer_fd
);
874 * If the session was previously started, start as well this newly
875 * created kernel session so the events/channels enabled *after* the
876 * start actually work.
878 if (session
->started
&& !session
->kernel_session
->started
) {
879 ret
= start_kernel_session(session
->kernel_session
, wpipe
);
880 if (ret
!= LTTNG_OK
) {
886 case LTTNG_DOMAIN_UST
:
888 struct ltt_ust_channel
*uchan
;
890 chan_ht
= usess
->domain_global
.channels
;
892 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
894 ret
= channel_ust_create(usess
, domain
, attr
);
896 ret
= channel_ust_enable(usess
, domain
, uchan
);
899 /* Start the UST session if the session was already started. */
900 if (session
->started
&& !usess
->start_trace
) {
901 ret
= ust_app_start_trace_all(usess
);
903 ret
= LTTNG_ERR_UST_START_FAIL
;
907 usess
->start_trace
= 1;
912 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
913 case LTTNG_DOMAIN_UST_EXEC_NAME
:
914 case LTTNG_DOMAIN_UST_PID
:
917 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
928 * Command LTTNG_DISABLE_EVENT processed by the client thread.
930 int cmd_disable_event(struct ltt_session
*session
, int domain
,
931 char *channel_name
, char *event_name
)
938 case LTTNG_DOMAIN_KERNEL
:
940 struct ltt_kernel_channel
*kchan
;
941 struct ltt_kernel_session
*ksess
;
943 ksess
= session
->kernel_session
;
945 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
947 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
951 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
952 if (ret
!= LTTNG_OK
) {
956 kernel_wait_quiescent(kernel_tracer_fd
);
959 case LTTNG_DOMAIN_UST
:
961 struct ltt_ust_channel
*uchan
;
962 struct ltt_ust_session
*usess
;
964 usess
= session
->ust_session
;
966 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
969 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
973 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
974 if (ret
!= LTTNG_OK
) {
978 DBG3("Disable UST event %s in channel %s completed", event_name
,
983 case LTTNG_DOMAIN_UST_EXEC_NAME
:
984 case LTTNG_DOMAIN_UST_PID
:
985 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1000 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1002 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
1010 case LTTNG_DOMAIN_KERNEL
:
1012 struct ltt_kernel_session
*ksess
;
1013 struct ltt_kernel_channel
*kchan
;
1015 ksess
= session
->kernel_session
;
1017 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1018 if (kchan
== NULL
) {
1019 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1023 ret
= event_kernel_disable_all(kchan
);
1024 if (ret
!= LTTNG_OK
) {
1028 kernel_wait_quiescent(kernel_tracer_fd
);
1031 case LTTNG_DOMAIN_UST
:
1033 struct ltt_ust_session
*usess
;
1034 struct ltt_ust_channel
*uchan
;
1036 usess
= session
->ust_session
;
1038 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1040 if (uchan
== NULL
) {
1041 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1045 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
1050 DBG3("Disable all UST events in channel %s completed", channel_name
);
1055 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1056 case LTTNG_DOMAIN_UST_PID
:
1057 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1060 ret
= LTTNG_ERR_UND
;
1072 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1074 int cmd_add_context(struct ltt_session
*session
, int domain
,
1075 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1080 case LTTNG_DOMAIN_KERNEL
:
1081 assert(session
->kernel_session
);
1083 if (session
->kernel_session
->channel_count
== 0) {
1084 /* Create default channel */
1085 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1086 if (ret
!= LTTNG_OK
) {
1091 /* Add kernel context to kernel tracer */
1092 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1093 if (ret
!= LTTNG_OK
) {
1097 case LTTNG_DOMAIN_UST
:
1099 struct ltt_ust_session
*usess
= session
->ust_session
;
1102 unsigned int chan_count
=
1103 lttng_ht_get_count(usess
->domain_global
.channels
);
1104 if (chan_count
== 0) {
1105 struct lttng_channel
*attr
;
1106 /* Create default channel */
1107 attr
= channel_new_default_attr(domain
);
1109 ret
= LTTNG_ERR_FATAL
;
1113 ret
= channel_ust_create(usess
, domain
, attr
);
1114 if (ret
!= LTTNG_OK
) {
1121 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1122 if (ret
!= LTTNG_OK
) {
1128 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1129 case LTTNG_DOMAIN_UST_PID
:
1130 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1133 ret
= LTTNG_ERR_UND
;
1144 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1146 int cmd_enable_event(struct ltt_session
*session
, int domain
,
1147 char *channel_name
, struct lttng_event
*event
,
1148 struct lttng_filter_bytecode
*filter
, int wpipe
)
1150 int ret
, channel_created
= 0;
1151 struct lttng_channel
*attr
;
1155 assert(channel_name
);
1160 case LTTNG_DOMAIN_KERNEL
:
1162 struct ltt_kernel_channel
*kchan
;
1164 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1165 session
->kernel_session
);
1166 if (kchan
== NULL
) {
1167 attr
= channel_new_default_attr(domain
);
1169 ret
= LTTNG_ERR_FATAL
;
1172 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1174 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1175 if (ret
!= LTTNG_OK
) {
1181 channel_created
= 1;
1184 /* Get the newly created kernel channel pointer */
1185 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1186 session
->kernel_session
);
1187 if (kchan
== NULL
) {
1188 /* This sould not happen... */
1189 ret
= LTTNG_ERR_FATAL
;
1193 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1194 if (ret
!= LTTNG_OK
) {
1195 if (channel_created
) {
1196 /* Let's not leak a useless channel. */
1197 kernel_destroy_channel(kchan
);
1202 kernel_wait_quiescent(kernel_tracer_fd
);
1205 case LTTNG_DOMAIN_UST
:
1207 struct ltt_ust_channel
*uchan
;
1208 struct ltt_ust_session
*usess
= session
->ust_session
;
1212 /* Get channel from global UST domain */
1213 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1215 if (uchan
== NULL
) {
1216 /* Create default channel */
1217 attr
= channel_new_default_attr(domain
);
1219 ret
= LTTNG_ERR_FATAL
;
1222 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1224 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1225 if (ret
!= LTTNG_OK
) {
1231 /* Get the newly created channel reference back */
1232 uchan
= trace_ust_find_channel_by_name(
1233 usess
->domain_global
.channels
, channel_name
);
1237 /* At this point, the session and channel exist on the tracer */
1238 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
, filter
);
1239 if (ret
!= LTTNG_OK
) {
1245 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1246 case LTTNG_DOMAIN_UST_PID
:
1247 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1250 ret
= LTTNG_ERR_UND
;
1262 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1264 int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
1265 char *channel_name
, int event_type
,
1266 struct lttng_filter_bytecode
*filter
, int wpipe
)
1269 struct lttng_channel
*attr
;
1272 assert(channel_name
);
1277 case LTTNG_DOMAIN_KERNEL
:
1279 struct ltt_kernel_channel
*kchan
;
1281 assert(session
->kernel_session
);
1283 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1284 session
->kernel_session
);
1285 if (kchan
== NULL
) {
1286 /* Create default channel */
1287 attr
= channel_new_default_attr(domain
);
1289 ret
= LTTNG_ERR_FATAL
;
1292 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1294 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1295 if (ret
!= LTTNG_OK
) {
1301 /* Get the newly created kernel channel pointer */
1302 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1303 session
->kernel_session
);
1307 switch (event_type
) {
1308 case LTTNG_EVENT_SYSCALL
:
1309 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1311 case LTTNG_EVENT_TRACEPOINT
:
1313 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1314 * events already registered to the channel.
1316 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1318 case LTTNG_EVENT_ALL
:
1319 /* Enable syscalls and tracepoints */
1320 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1323 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1327 /* Manage return value */
1328 if (ret
!= LTTNG_OK
) {
1330 * On error, cmd_enable_channel call will take care of destroying
1331 * the created channel if it was needed.
1336 kernel_wait_quiescent(kernel_tracer_fd
);
1339 case LTTNG_DOMAIN_UST
:
1341 struct ltt_ust_channel
*uchan
;
1342 struct ltt_ust_session
*usess
= session
->ust_session
;
1346 /* Get channel from global UST domain */
1347 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1349 if (uchan
== NULL
) {
1350 /* Create default channel */
1351 attr
= channel_new_default_attr(domain
);
1353 ret
= LTTNG_ERR_FATAL
;
1356 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1358 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1359 if (ret
!= LTTNG_OK
) {
1365 /* Get the newly created channel reference back */
1366 uchan
= trace_ust_find_channel_by_name(
1367 usess
->domain_global
.channels
, channel_name
);
1371 /* At this point, the session and channel exist on the tracer */
1373 switch (event_type
) {
1374 case LTTNG_EVENT_ALL
:
1375 case LTTNG_EVENT_TRACEPOINT
:
1376 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
,
1378 if (ret
!= LTTNG_OK
) {
1383 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1387 /* Manage return value */
1388 if (ret
!= LTTNG_OK
) {
1395 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1396 case LTTNG_DOMAIN_UST_PID
:
1397 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1400 ret
= LTTNG_ERR_UND
;
1413 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1415 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1418 ssize_t nb_events
= 0;
1421 case LTTNG_DOMAIN_KERNEL
:
1422 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1423 if (nb_events
< 0) {
1424 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1428 case LTTNG_DOMAIN_UST
:
1429 nb_events
= ust_app_list_events(events
);
1430 if (nb_events
< 0) {
1431 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1436 ret
= LTTNG_ERR_UND
;
1443 /* Return negative value to differentiate return code */
1448 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1450 ssize_t
cmd_list_tracepoint_fields(int domain
,
1451 struct lttng_event_field
**fields
)
1454 ssize_t nb_fields
= 0;
1457 case LTTNG_DOMAIN_UST
:
1458 nb_fields
= ust_app_list_event_fields(fields
);
1459 if (nb_fields
< 0) {
1460 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1464 case LTTNG_DOMAIN_KERNEL
:
1465 default: /* fall-through */
1466 ret
= LTTNG_ERR_UND
;
1473 /* Return negative value to differentiate return code */
1478 * Command LTTNG_START_TRACE processed by the client thread.
1480 int cmd_start_trace(struct ltt_session
*session
)
1483 struct ltt_kernel_session
*ksession
;
1484 struct ltt_ust_session
*usess
;
1488 /* Ease our life a bit ;) */
1489 ksession
= session
->kernel_session
;
1490 usess
= session
->ust_session
;
1492 if (session
->enabled
) {
1493 /* Already started. */
1494 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1498 session
->enabled
= 1;
1500 /* Kernel tracing */
1501 if (ksession
!= NULL
) {
1502 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1503 if (ret
!= LTTNG_OK
) {
1508 /* Flag session that trace should start automatically */
1510 usess
->start_trace
= 1;
1512 ret
= ust_app_start_trace_all(usess
);
1514 ret
= LTTNG_ERR_UST_START_FAIL
;
1519 session
->started
= 1;
1528 * Command LTTNG_STOP_TRACE processed by the client thread.
1530 int cmd_stop_trace(struct ltt_session
*session
)
1533 struct ltt_kernel_channel
*kchan
;
1534 struct ltt_kernel_session
*ksession
;
1535 struct ltt_ust_session
*usess
;
1540 ksession
= session
->kernel_session
;
1541 usess
= session
->ust_session
;
1543 if (!session
->enabled
) {
1544 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1548 session
->enabled
= 0;
1552 DBG("Stop kernel tracing");
1554 /* Flush metadata if exist */
1555 if (ksession
->metadata_stream_fd
>= 0) {
1556 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1558 ERR("Kernel metadata flush failed");
1562 /* Flush all buffers before stopping */
1563 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1564 ret
= kernel_flush_buffer(kchan
);
1566 ERR("Kernel flush buffer error");
1570 ret
= kernel_stop_session(ksession
);
1572 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1576 kernel_wait_quiescent(kernel_tracer_fd
);
1578 ksession
->started
= 0;
1582 usess
->start_trace
= 0;
1584 ret
= ust_app_stop_trace_all(usess
);
1586 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1591 session
->started
= 0;
1600 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1602 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1603 size_t nb_uri
, struct lttng_uri
*uris
)
1606 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1607 struct ltt_ust_session
*usess
= session
->ust_session
;
1608 struct consumer_output
*consumer
= NULL
;
1614 /* Can't enable consumer after session started. */
1615 if (session
->enabled
) {
1616 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1621 * This case switch makes sure the domain session has a temporary consumer
1622 * so the URL can be set.
1626 /* Code flow error. A session MUST always have a consumer object */
1627 assert(session
->consumer
);
1629 * The URL will be added to the tracing session consumer instead of a
1630 * specific domain consumer.
1632 consumer
= session
->consumer
;
1634 case LTTNG_DOMAIN_KERNEL
:
1635 /* Code flow error if we don't have a kernel session here. */
1638 /* Create consumer output if none exists */
1639 consumer
= ksess
->tmp_consumer
;
1640 if (consumer
== NULL
) {
1641 consumer
= consumer_copy_output(ksess
->consumer
);
1642 if (consumer
== NULL
) {
1643 ret
= LTTNG_ERR_FATAL
;
1646 /* Trash the consumer subdir, we are about to set a new one. */
1647 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1648 ksess
->tmp_consumer
= consumer
;
1652 case LTTNG_DOMAIN_UST
:
1653 /* Code flow error if we don't have a kernel session here. */
1656 /* Create consumer output if none exists */
1657 consumer
= usess
->tmp_consumer
;
1658 if (consumer
== NULL
) {
1659 consumer
= consumer_copy_output(usess
->consumer
);
1660 if (consumer
== NULL
) {
1661 ret
= LTTNG_ERR_FATAL
;
1664 /* Trash the consumer subdir, we are about to set a new one. */
1665 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1666 usess
->tmp_consumer
= consumer
;
1672 for (i
= 0; i
< nb_uri
; i
++) {
1673 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1687 * Command LTTNG_CREATE_SESSION processed by the client thread.
1689 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1690 size_t nb_uri
, lttng_sock_cred
*creds
)
1694 struct ltt_session
*session
;
1699 * Verify if the session already exist
1701 * XXX: There is no need for the session lock list here since the caller
1702 * (process_client_msg) is holding it. We might want to change that so a
1703 * single command does not lock the entire session list.
1705 session
= session_find_by_name(name
);
1706 if (session
!= NULL
) {
1707 ret
= LTTNG_ERR_EXIST_SESS
;
1711 /* Create tracing session in the registry */
1712 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
1713 LTTNG_SOCK_GET_GID_CRED(creds
));
1714 if (ret
!= LTTNG_OK
) {
1719 * Get the newly created session pointer back
1721 * XXX: There is no need for the session lock list here since the caller
1722 * (process_client_msg) is holding it. We might want to change that so a
1723 * single command does not lock the entire session list.
1725 session
= session_find_by_name(name
);
1728 /* Create default consumer output for the session not yet created. */
1729 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1730 if (session
->consumer
== NULL
) {
1731 ret
= LTTNG_ERR_FATAL
;
1732 goto consumer_error
;
1736 * This means that the lttng_create_session call was called with the _path_
1737 * argument set to NULL.
1741 * At this point, we'll skip the consumer URI setup and create a
1742 * session with a NULL path which will flag the session to NOT spawn a
1745 DBG("Create session %s with NO uri, skipping consumer setup", name
);
1749 session
->start_consumer
= 1;
1751 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1752 if (ret
!= LTTNG_OK
) {
1753 goto consumer_error
;
1756 session
->consumer
->enabled
= 1;
1762 session_destroy(session
);
1769 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1771 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1774 struct ltt_ust_session
*usess
;
1775 struct ltt_kernel_session
*ksess
;
1780 usess
= session
->ust_session
;
1781 ksess
= session
->kernel_session
;
1783 /* Clean kernel session teardown */
1784 kernel_destroy_session(ksess
);
1786 /* UST session teardown */
1788 /* Close any relayd session */
1789 consumer_output_send_destroy_relayd(usess
->consumer
);
1791 /* Destroy every UST application related to this session. */
1792 ret
= ust_app_destroy_trace_all(usess
);
1794 ERR("Error in ust_app_destroy_trace_all");
1797 /* Clean up the rest. */
1798 trace_ust_destroy_session(usess
);
1802 * Must notify the kernel thread here to update it's poll set in order to
1803 * remove the channel(s)' fd just destroyed.
1805 ret
= notify_thread_pipe(wpipe
);
1807 PERROR("write kernel poll pipe");
1810 ret
= session_destroy(session
);
1816 * Command LTTNG_CALIBRATE processed by the client thread.
1818 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1823 case LTTNG_DOMAIN_KERNEL
:
1825 struct lttng_kernel_calibrate kcalibrate
;
1827 kcalibrate
.type
= calibrate
->type
;
1828 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1830 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1835 case LTTNG_DOMAIN_UST
:
1837 struct lttng_ust_calibrate ucalibrate
;
1839 ucalibrate
.type
= calibrate
->type
;
1840 ret
= ust_app_calibrate_glb(&ucalibrate
);
1842 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1848 ret
= LTTNG_ERR_UND
;
1859 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1861 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1862 const char *sock_path
, struct consumer_data
*cdata
)
1865 struct consumer_socket
*socket
;
1872 case LTTNG_DOMAIN_KERNEL
:
1874 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1878 /* Can't register a consumer if there is already one */
1879 if (ksess
->consumer_fds_sent
!= 0) {
1880 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1884 sock
= lttcomm_connect_unix_sock(sock_path
);
1886 ret
= LTTNG_ERR_CONNECT_FAIL
;
1890 socket
= consumer_allocate_socket(sock
);
1891 if (socket
== NULL
) {
1894 PERROR("close register consumer");
1896 ret
= LTTNG_ERR_FATAL
;
1900 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1901 if (socket
->lock
== NULL
) {
1902 PERROR("zmalloc pthread mutex");
1903 ret
= LTTNG_ERR_FATAL
;
1906 pthread_mutex_init(socket
->lock
, NULL
);
1907 socket
->registered
= 1;
1910 consumer_add_socket(socket
, ksess
->consumer
);
1913 pthread_mutex_lock(&cdata
->pid_mutex
);
1915 pthread_mutex_unlock(&cdata
->pid_mutex
);
1920 /* TODO: Userspace tracing */
1921 ret
= LTTNG_ERR_UND
;
1932 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1934 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1935 struct lttng_domain
**domains
)
1940 if (session
->kernel_session
!= NULL
) {
1941 DBG3("Listing domains found kernel domain");
1945 if (session
->ust_session
!= NULL
) {
1946 DBG3("Listing domains found UST global domain");
1950 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1951 if (*domains
== NULL
) {
1952 ret
= LTTNG_ERR_FATAL
;
1956 if (session
->kernel_session
!= NULL
) {
1957 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1961 if (session
->ust_session
!= NULL
) {
1962 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1969 /* Return negative value to differentiate return code */
1975 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1977 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1978 struct lttng_channel
**channels
)
1981 ssize_t nb_chan
= 0;
1984 case LTTNG_DOMAIN_KERNEL
:
1985 if (session
->kernel_session
!= NULL
) {
1986 nb_chan
= session
->kernel_session
->channel_count
;
1988 DBG3("Number of kernel channels %zd", nb_chan
);
1990 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1993 case LTTNG_DOMAIN_UST
:
1994 if (session
->ust_session
!= NULL
) {
1995 nb_chan
= lttng_ht_get_count(
1996 session
->ust_session
->domain_global
.channels
);
1998 DBG3("Number of UST global channels %zd", nb_chan
);
2000 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2005 ret
= LTTNG_ERR_UND
;
2010 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2011 if (*channels
== NULL
) {
2012 ret
= LTTNG_ERR_FATAL
;
2016 list_lttng_channels(domain
, session
, *channels
);
2019 /* Ret value was set in the domain switch case */
2026 /* Return negative value to differentiate return code */
2031 * Command LTTNG_LIST_EVENTS processed by the client thread.
2033 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2034 char *channel_name
, struct lttng_event
**events
)
2037 ssize_t nb_event
= 0;
2040 case LTTNG_DOMAIN_KERNEL
:
2041 if (session
->kernel_session
!= NULL
) {
2042 nb_event
= list_lttng_kernel_events(channel_name
,
2043 session
->kernel_session
, events
);
2046 case LTTNG_DOMAIN_UST
:
2048 if (session
->ust_session
!= NULL
) {
2049 nb_event
= list_lttng_ust_global_events(channel_name
,
2050 &session
->ust_session
->domain_global
, events
);
2055 ret
= LTTNG_ERR_UND
;
2062 /* Return negative value to differentiate return code */
2067 * Using the session list, filled a lttng_session array to send back to the
2068 * client for session listing.
2070 * The session list lock MUST be acquired before calling this function. Use
2071 * session_lock_list() and session_unlock_list().
2073 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2078 struct ltt_session
*session
;
2079 struct ltt_session_list
*list
= session_get_list();
2081 DBG("Getting all available session for UID %d GID %d",
2084 * Iterate over session list and append data after the control struct in
2087 cds_list_for_each_entry(session
, &list
->head
, list
) {
2089 * Only list the sessions the user can control.
2091 if (!session_access_ok(session
, uid
, gid
)) {
2095 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2096 struct ltt_ust_session
*usess
= session
->ust_session
;
2098 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2099 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2100 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2101 ret
= build_network_session_path(sessions
[i
].path
,
2102 sizeof(session
[i
].path
), session
);
2104 ret
= snprintf(sessions
[i
].path
, sizeof(session
[i
].path
), "%s",
2105 session
->consumer
->dst
.trace_path
);
2108 PERROR("snprintf session path");
2112 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2113 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2114 sessions
[i
].enabled
= session
->enabled
;
2120 * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
2122 int cmd_disable_consumer(int domain
, struct ltt_session
*session
)
2125 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2126 struct ltt_ust_session
*usess
= session
->ust_session
;
2127 struct consumer_output
*consumer
;
2131 if (session
->enabled
) {
2132 /* Can't disable consumer on an already started session */
2133 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2137 if (!session
->start_consumer
) {
2138 ret
= LTTNG_ERR_NO_CONSUMER
;
2144 DBG("Disable tracing session %s consumer", session
->name
);
2145 consumer
= session
->consumer
;
2147 case LTTNG_DOMAIN_KERNEL
:
2148 /* Code flow error if we don't have a kernel session here. */
2151 DBG("Disabling kernel consumer");
2152 consumer
= ksess
->consumer
;
2155 case LTTNG_DOMAIN_UST
:
2156 /* Code flow error if we don't have a UST session here. */
2159 DBG("Disabling UST consumer");
2160 consumer
= usess
->consumer
;
2164 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2169 consumer
->enabled
= 0;
2170 /* Success at this point */
2173 ret
= LTTNG_ERR_NO_CONSUMER
;
2181 * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
2183 int cmd_enable_consumer(int domain
, struct ltt_session
*session
)
2186 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2187 struct ltt_ust_session
*usess
= session
->ust_session
;
2188 struct consumer_output
*consumer
= NULL
;
2192 /* Can't enable consumer after session started. */
2193 if (session
->enabled
) {
2194 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2200 assert(session
->consumer
);
2201 consumer
= session
->consumer
;
2203 case LTTNG_DOMAIN_KERNEL
:
2204 /* Code flow error if we don't have a kernel session here. */
2208 * Check if we have already sent fds to the consumer. In that case,
2209 * the enable-consumer command can't be used because a start trace
2210 * had previously occured.
2212 if (ksess
->consumer_fds_sent
) {
2213 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2217 consumer
= ksess
->tmp_consumer
;
2218 if (consumer
== NULL
) {
2220 /* No temp. consumer output exists. Using the current one. */
2221 DBG3("No temporary consumer. Using default");
2222 consumer
= ksess
->consumer
;
2226 switch (consumer
->type
) {
2227 case CONSUMER_DST_LOCAL
:
2228 DBG2("Consumer output is local. Creating directory(ies)");
2230 /* Create directory(ies) */
2231 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2232 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2234 if (ret
!= -EEXIST
) {
2235 ERR("Trace directory creation error");
2236 ret
= LTTNG_ERR_FATAL
;
2241 case CONSUMER_DST_NET
:
2242 DBG2("Consumer output is network. Validating URIs");
2243 /* Validate if we have both control and data path set. */
2244 if (!consumer
->dst
.net
.control_isset
) {
2245 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2249 if (!consumer
->dst
.net
.data_isset
) {
2250 ret
= LTTNG_ERR_URL_DATA_MISS
;
2254 /* Check established network session state */
2255 if (session
->net_handle
== 0) {
2256 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2257 ERR("Session network handle is not set on enable-consumer");
2266 * This is race free for now since the session lock is acquired before
2267 * ending up in this function. No other threads can access this kernel
2268 * session without this lock hence freeing the consumer output object
2272 /* Destroy current consumer. We are about to replace it */
2273 consumer_destroy_output(ksess
->consumer
);
2275 ksess
->consumer
= consumer
;
2276 ksess
->tmp_consumer
= NULL
;
2279 case LTTNG_DOMAIN_UST
:
2280 /* Code flow error if we don't have a UST session here. */
2284 * Check if we have already sent fds to the consumer. In that case,
2285 * the enable-consumer command can't be used because a start trace
2286 * had previously occured.
2288 if (usess
->start_trace
) {
2289 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2293 consumer
= usess
->tmp_consumer
;
2294 if (consumer
== NULL
) {
2296 /* No temp. consumer output exists. Using the current one. */
2297 DBG3("No temporary consumer. Using default");
2298 consumer
= usess
->consumer
;
2302 switch (consumer
->type
) {
2303 case CONSUMER_DST_LOCAL
:
2304 DBG2("Consumer output is local. Creating directory(ies)");
2306 /* Create directory(ies) */
2307 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2308 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2310 if (ret
!= -EEXIST
) {
2311 ERR("Trace directory creation error");
2312 ret
= LTTNG_ERR_FATAL
;
2317 case CONSUMER_DST_NET
:
2318 DBG2("Consumer output is network. Validating URIs");
2319 /* Validate if we have both control and data path set. */
2320 if (!consumer
->dst
.net
.control_isset
) {
2321 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2325 if (!consumer
->dst
.net
.data_isset
) {
2326 ret
= LTTNG_ERR_URL_DATA_MISS
;
2330 /* Check established network session state */
2331 if (session
->net_handle
== 0) {
2332 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2333 DBG2("Session network handle is not set on enable-consumer");
2337 if (consumer
->net_seq_index
== -1) {
2338 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2339 DBG2("Network index is not set on the consumer");
2348 * This is race free for now since the session lock is acquired before
2349 * ending up in this function. No other threads can access this kernel
2350 * session without this lock hence freeing the consumer output object
2354 /* Destroy current consumer. We are about to replace it */
2355 consumer_destroy_output(usess
->consumer
);
2357 usess
->consumer
= consumer
;
2358 usess
->tmp_consumer
= NULL
;
2363 session
->start_consumer
= 1;
2367 consumer
->enabled
= 1;
2368 /* Success at this point */
2371 /* Should not really happend... */
2372 ret
= LTTNG_ERR_NO_CONSUMER
;
2380 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2381 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2383 int cmd_data_pending(struct ltt_session
*session
)
2386 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2387 struct ltt_ust_session
*usess
= session
->ust_session
;
2391 /* Session MUST be stopped to ask for data availability. */
2392 if (session
->enabled
) {
2393 ret
= LTTNG_ERR_SESSION_STARTED
;
2397 if (ksess
&& ksess
->consumer
) {
2398 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2400 /* Data is still being extracted for the kernel. */
2405 if (usess
&& usess
->consumer
) {
2406 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2408 /* Data is still being extracted for the kernel. */
2413 /* Data is ready to be read by a viewer */
2421 * Init command subsystem.
2426 * Set network sequence index to 1 for streams to match a relayd socket on
2427 * the consumer side.
2429 uatomic_set(&relayd_net_seq_idx
, 1);
2431 DBG("Command subsystem initialized");