2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #include <urcu/list.h>
21 #include <urcu/uatomic.h>
23 #include <common/defaults.h>
24 #include <common/common.h>
25 #include <common/sessiond-comm/sessiond-comm.h>
26 #include <common/relayd/relayd.h>
32 #include "kernel-consumer.h"
33 #include "lttng-sessiond.h"
39 * Used to keep a unique index for each relayd socket created where this value
40 * is associated with streams on the consumer so it can match the right relayd
43 * This value should be incremented atomically for safety purposes and future
44 * possible concurrent access.
46 static unsigned int relayd_net_seq_idx
;
49 * Create a session path used by list_lttng_sessions for the case that the
50 * session consumer is on the network.
52 static int build_network_session_path(char *dst
, size_t size
,
53 struct ltt_session
*session
)
55 int ret
, kdata_port
, udata_port
;
56 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
57 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
62 memset(tmp_urls
, 0, sizeof(tmp_urls
));
63 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
65 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
67 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
68 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
69 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
72 if (session
->ust_session
&& session
->ust_session
->consumer
) {
73 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
74 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
77 if (uuri
== NULL
&& kuri
== NULL
) {
78 uri
= &session
->consumer
->dst
.net
.control
;
79 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
80 } else if (kuri
&& uuri
) {
81 ret
= uri_compare(kuri
, uuri
);
85 /* Build uuri URL string */
86 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
93 } else if (kuri
&& uuri
== NULL
) {
95 } else if (uuri
&& kuri
== NULL
) {
99 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
105 * Do we have a UST url set. If yes, this means we have both kernel and UST
108 if (strlen(tmp_uurl
) > 0) {
109 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
110 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
116 /* No kernel URI, use the UST port. */
119 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, dport
);
127 * Fill lttng_channel array of all channels.
129 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
130 struct lttng_channel
*channels
)
133 struct ltt_kernel_channel
*kchan
;
135 DBG("Listing channels for session %s", session
->name
);
138 case LTTNG_DOMAIN_KERNEL
:
139 /* Kernel channels */
140 if (session
->kernel_session
!= NULL
) {
141 cds_list_for_each_entry(kchan
,
142 &session
->kernel_session
->channel_list
.head
, list
) {
143 /* Copy lttng_channel struct to array */
144 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
145 channels
[i
].enabled
= kchan
->enabled
;
150 case LTTNG_DOMAIN_UST
:
152 struct lttng_ht_iter iter
;
153 struct ltt_ust_channel
*uchan
;
156 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
157 &iter
.iter
, uchan
, node
.node
) {
158 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
159 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
160 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
161 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
162 channels
[i
].attr
.switch_timer_interval
=
163 uchan
->attr
.switch_timer_interval
;
164 channels
[i
].attr
.read_timer_interval
=
165 uchan
->attr
.read_timer_interval
;
166 channels
[i
].enabled
= uchan
->enabled
;
167 switch (uchan
->attr
.output
) {
170 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
184 * Create a list of ust global domain events.
186 static int list_lttng_ust_global_events(char *channel_name
,
187 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
190 unsigned int nb_event
= 0;
191 struct lttng_ht_iter iter
;
192 struct lttng_ht_node_str
*node
;
193 struct ltt_ust_channel
*uchan
;
194 struct ltt_ust_event
*uevent
;
195 struct lttng_event
*tmp
;
197 DBG("Listing UST global events for channel %s", channel_name
);
201 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
202 node
= lttng_ht_iter_get_node_str(&iter
);
204 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
208 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
210 nb_event
+= lttng_ht_get_count(uchan
->events
);
217 DBG3("Listing UST global %d events", nb_event
);
219 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
221 ret
= LTTNG_ERR_FATAL
;
225 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
226 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
227 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
228 tmp
[i
].enabled
= uevent
->enabled
;
230 switch (uevent
->attr
.instrumentation
) {
231 case LTTNG_UST_TRACEPOINT
:
232 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
234 case LTTNG_UST_PROBE
:
235 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
237 case LTTNG_UST_FUNCTION
:
238 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
242 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
243 switch (uevent
->attr
.loglevel_type
) {
244 case LTTNG_UST_LOGLEVEL_ALL
:
245 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
247 case LTTNG_UST_LOGLEVEL_RANGE
:
248 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
250 case LTTNG_UST_LOGLEVEL_SINGLE
:
251 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
254 if (uevent
->filter
) {
269 * Fill lttng_event array of all kernel events in the channel.
271 static int list_lttng_kernel_events(char *channel_name
,
272 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
275 unsigned int nb_event
;
276 struct ltt_kernel_event
*event
;
277 struct ltt_kernel_channel
*kchan
;
279 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
281 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
285 nb_event
= kchan
->event_count
;
287 DBG("Listing events for channel %s", kchan
->channel
->name
);
293 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
294 if (*events
== NULL
) {
295 ret
= LTTNG_ERR_FATAL
;
299 /* Kernel channels */
300 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
301 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
302 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
303 (*events
)[i
].enabled
= event
->enabled
;
305 switch (event
->event
->instrumentation
) {
306 case LTTNG_KERNEL_TRACEPOINT
:
307 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
309 case LTTNG_KERNEL_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 /* Set URI into consumer output object */
384 ret
= consumer_set_network_uri(consumer
, uri
);
386 ret
= LTTNG_ERR_FATAL
;
388 } else if (ret
== 1) {
390 * URI was the same in the consumer so we do not append the subdir
391 * again so to not duplicate output dir.
396 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
397 ret
= consumer_set_subdir(consumer
, session_name
);
399 ret
= LTTNG_ERR_FATAL
;
404 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
405 /* On a new subdir, reappend the default trace dir. */
406 strncat(consumer
->subdir
, default_trace_dir
,
407 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
408 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
413 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
414 memset(consumer
->dst
.trace_path
, 0,
415 sizeof(consumer
->dst
.trace_path
));
416 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
417 sizeof(consumer
->dst
.trace_path
));
418 /* Append default trace dir */
419 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
420 sizeof(consumer
->dst
.trace_path
) -
421 strlen(consumer
->dst
.trace_path
) - 1);
422 /* Flag consumer as local. */
423 consumer
->type
= CONSUMER_DST_LOCAL
;
432 * Init tracing by creating trace directory and sending fds kernel consumer.
434 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
437 struct lttng_ht_iter iter
;
438 struct consumer_socket
*socket
;
444 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
445 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
447 /* Code flow error */
448 assert(socket
->fd
>= 0);
450 pthread_mutex_lock(socket
->lock
);
451 ret
= kernel_consumer_send_session(socket
, session
);
452 pthread_mutex_unlock(socket
->lock
);
454 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
466 * Create a socket to the relayd using the URI.
468 * On success, the relayd_sock pointer is set to the created socket.
469 * Else, it's stays untouched and a lttcomm error code is returned.
471 static int create_connect_relayd(struct consumer_output
*output
,
472 const char *session_name
, struct lttng_uri
*uri
,
473 struct lttcomm_sock
**relayd_sock
)
476 struct lttcomm_sock
*sock
;
478 /* Create socket object from URI */
479 sock
= lttcomm_alloc_sock_from_uri(uri
);
481 ret
= LTTNG_ERR_FATAL
;
485 ret
= lttcomm_create_sock(sock
);
487 ret
= LTTNG_ERR_FATAL
;
491 /* Connect to relayd so we can proceed with a session creation. */
493 ret
= relayd_connect(sock
);
496 ERR("Unable to reach lttng-relayd");
497 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
501 /* Create socket for control stream. */
502 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
503 DBG3("Creating relayd stream socket from URI");
505 /* Check relayd version */
506 ret
= relayd_version_check(sock
, RELAYD_VERSION_COMM_MAJOR
,
507 RELAYD_VERSION_COMM_MINOR
);
509 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
512 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
513 DBG3("Creating relayd data socket from URI");
515 /* Command is not valid */
516 ERR("Relayd invalid stream type: %d", uri
->stype
);
517 ret
= LTTNG_ERR_INVALID
;
527 (void) relayd_close(sock
);
531 lttcomm_destroy_sock(sock
);
538 * Connect to the relayd using URI and send the socket to the right consumer.
540 static int send_consumer_relayd_socket(int domain
, struct ltt_session
*session
,
541 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
542 struct consumer_socket
*consumer_sock
)
545 struct lttcomm_sock
*sock
= NULL
;
547 /* Set the network sequence index if not set. */
548 if (consumer
->net_seq_index
== -1) {
550 * Increment net_seq_idx because we are about to transfer the
551 * new relayd socket to the consumer.
553 uatomic_inc(&relayd_net_seq_idx
);
554 /* Assign unique key so the consumer can match streams */
555 uatomic_set(&consumer
->net_seq_index
,
556 uatomic_read(&relayd_net_seq_idx
));
559 /* Connect to relayd and make version check if uri is the control. */
560 ret
= create_connect_relayd(consumer
, session
->name
, relayd_uri
, &sock
);
561 if (ret
!= LTTNG_OK
) {
565 /* If the control socket is connected, network session is ready */
566 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
567 session
->net_handle
= 1;
570 /* Send relayd socket to consumer. */
571 ret
= consumer_send_relayd_socket(consumer_sock
, sock
,
572 consumer
, relayd_uri
->stype
, session
->id
);
574 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
578 /* Flag that the corresponding socket was sent. */
579 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
580 consumer_sock
->control_sock_sent
= 1;
581 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
582 consumer_sock
->data_sock_sent
= 1;
588 * Close socket which was dup on the consumer side. The session daemon does
589 * NOT keep track of the relayd socket(s) once transfer to the consumer.
594 (void) relayd_close(sock
);
595 lttcomm_destroy_sock(sock
);
602 * Send both relayd sockets to a specific consumer and domain. This is a
603 * helper function to facilitate sending the information to the consumer for a
606 static int send_consumer_relayd_sockets(int domain
,
607 struct ltt_session
*session
, struct consumer_output
*consumer
,
608 struct consumer_socket
*sock
)
615 /* Sending control relayd socket. */
616 if (!sock
->control_sock_sent
) {
617 ret
= send_consumer_relayd_socket(domain
, session
,
618 &consumer
->dst
.net
.control
, consumer
, sock
);
619 if (ret
!= LTTNG_OK
) {
624 /* Sending data relayd socket. */
625 if (!sock
->data_sock_sent
) {
626 ret
= send_consumer_relayd_socket(domain
, session
,
627 &consumer
->dst
.net
.data
, consumer
, sock
);
628 if (ret
!= LTTNG_OK
) {
638 * Setup relayd connections for a tracing session. First creates the socket to
639 * the relayd and send them to the right domain consumer. Consumer type MUST be
642 static int setup_relayd(struct ltt_session
*session
)
645 struct ltt_ust_session
*usess
;
646 struct ltt_kernel_session
*ksess
;
647 struct consumer_socket
*socket
;
648 struct lttng_ht_iter iter
;
652 usess
= session
->ust_session
;
653 ksess
= session
->kernel_session
;
655 DBG2("Setting relayd for session %s", session
->name
);
659 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
660 && usess
->consumer
->enabled
) {
661 /* For each consumer socket, send relayd sockets */
662 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
664 /* Code flow error */
665 assert(socket
->fd
>= 0);
667 pthread_mutex_lock(socket
->lock
);
668 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
,
669 usess
->consumer
, socket
);
670 pthread_mutex_unlock(socket
->lock
);
671 if (ret
!= LTTNG_OK
) {
677 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
678 && ksess
->consumer
->enabled
) {
679 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
681 /* Code flow error */
682 assert(socket
->fd
>= 0);
684 pthread_mutex_lock(socket
->lock
);
685 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
,
686 ksess
->consumer
, socket
);
687 pthread_mutex_unlock(socket
->lock
);
688 if (ret
!= LTTNG_OK
) {
700 * Start a kernel session by opening all necessary streams.
702 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
705 struct ltt_kernel_channel
*kchan
;
707 /* Open kernel metadata */
708 if (ksess
->metadata
== NULL
) {
709 ret
= kernel_open_metadata(ksess
);
711 ret
= LTTNG_ERR_KERN_META_FAIL
;
716 /* Open kernel metadata stream */
717 if (ksess
->metadata_stream_fd
< 0) {
718 ret
= kernel_open_metadata_stream(ksess
);
720 ERR("Kernel create metadata stream failed");
721 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
726 /* For each channel */
727 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
728 if (kchan
->stream_count
== 0) {
729 ret
= kernel_open_channel_stream(kchan
);
731 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
734 /* Update the stream global counter */
735 ksess
->stream_count_global
+= ret
;
739 /* Setup kernel consumer socket and send fds to it */
740 ret
= init_kernel_tracing(ksess
);
742 ret
= LTTNG_ERR_KERN_START_FAIL
;
746 /* This start the kernel tracing */
747 ret
= kernel_start_session(ksess
);
749 ret
= LTTNG_ERR_KERN_START_FAIL
;
753 /* Quiescent wait after starting trace */
754 kernel_wait_quiescent(kernel_tracer_fd
);
765 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
767 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
771 struct ltt_ust_session
*usess
;
773 usess
= session
->ust_session
;
778 case LTTNG_DOMAIN_KERNEL
:
780 ret
= channel_kernel_disable(session
->kernel_session
,
782 if (ret
!= LTTNG_OK
) {
786 kernel_wait_quiescent(kernel_tracer_fd
);
789 case LTTNG_DOMAIN_UST
:
791 struct ltt_ust_channel
*uchan
;
792 struct lttng_ht
*chan_ht
;
794 chan_ht
= usess
->domain_global
.channels
;
796 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
798 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
802 ret
= channel_ust_disable(usess
, domain
, uchan
);
803 if (ret
!= LTTNG_OK
) {
809 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
810 case LTTNG_DOMAIN_UST_EXEC_NAME
:
811 case LTTNG_DOMAIN_UST_PID
:
814 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
826 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
828 * The wpipe arguments is used as a notifier for the kernel thread.
830 int cmd_enable_channel(struct ltt_session
*session
,
831 int domain
, struct lttng_channel
*attr
, int wpipe
)
834 struct ltt_ust_session
*usess
= session
->ust_session
;
835 struct lttng_ht
*chan_ht
;
840 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
845 case LTTNG_DOMAIN_KERNEL
:
847 struct ltt_kernel_channel
*kchan
;
849 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
850 session
->kernel_session
);
852 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
854 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
857 if (ret
!= LTTNG_OK
) {
861 kernel_wait_quiescent(kernel_tracer_fd
);
864 * If the session was previously started, start as well this newly
865 * created kernel session so the events/channels enabled *after* the
866 * start actually work.
868 if (session
->started
&& !session
->kernel_session
->started
) {
869 ret
= start_kernel_session(session
->kernel_session
, wpipe
);
870 if (ret
!= LTTNG_OK
) {
876 case LTTNG_DOMAIN_UST
:
878 struct ltt_ust_channel
*uchan
;
880 chan_ht
= usess
->domain_global
.channels
;
882 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
884 ret
= channel_ust_create(usess
, domain
, attr
);
886 ret
= channel_ust_enable(usess
, domain
, uchan
);
889 /* Start the UST session if the session was already started. */
890 if (session
->started
&& !usess
->start_trace
) {
891 ret
= ust_app_start_trace_all(usess
);
893 ret
= LTTNG_ERR_UST_START_FAIL
;
897 usess
->start_trace
= 1;
902 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
903 case LTTNG_DOMAIN_UST_EXEC_NAME
:
904 case LTTNG_DOMAIN_UST_PID
:
907 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
918 * Command LTTNG_DISABLE_EVENT processed by the client thread.
920 int cmd_disable_event(struct ltt_session
*session
, int domain
,
921 char *channel_name
, char *event_name
)
928 case LTTNG_DOMAIN_KERNEL
:
930 struct ltt_kernel_channel
*kchan
;
931 struct ltt_kernel_session
*ksess
;
933 ksess
= session
->kernel_session
;
935 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
937 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
941 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
942 if (ret
!= LTTNG_OK
) {
946 kernel_wait_quiescent(kernel_tracer_fd
);
949 case LTTNG_DOMAIN_UST
:
951 struct ltt_ust_channel
*uchan
;
952 struct ltt_ust_session
*usess
;
954 usess
= session
->ust_session
;
956 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
959 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
963 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
964 if (ret
!= LTTNG_OK
) {
968 DBG3("Disable UST event %s in channel %s completed", event_name
,
973 case LTTNG_DOMAIN_UST_EXEC_NAME
:
974 case LTTNG_DOMAIN_UST_PID
:
975 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
990 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
992 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
1000 case LTTNG_DOMAIN_KERNEL
:
1002 struct ltt_kernel_session
*ksess
;
1003 struct ltt_kernel_channel
*kchan
;
1005 ksess
= session
->kernel_session
;
1007 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1008 if (kchan
== NULL
) {
1009 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1013 ret
= event_kernel_disable_all(ksess
, kchan
);
1014 if (ret
!= LTTNG_OK
) {
1018 kernel_wait_quiescent(kernel_tracer_fd
);
1021 case LTTNG_DOMAIN_UST
:
1023 struct ltt_ust_session
*usess
;
1024 struct ltt_ust_channel
*uchan
;
1026 usess
= session
->ust_session
;
1028 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1030 if (uchan
== NULL
) {
1031 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1035 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
1040 DBG3("Disable all UST events in channel %s completed", channel_name
);
1045 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1046 case LTTNG_DOMAIN_UST_PID
:
1047 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1050 ret
= LTTNG_ERR_UND
;
1062 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1064 int cmd_add_context(struct ltt_session
*session
, int domain
,
1065 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1070 case LTTNG_DOMAIN_KERNEL
:
1071 assert(session
->kernel_session
);
1073 if (session
->kernel_session
->channel_count
== 0) {
1074 /* Create default channel */
1075 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1076 if (ret
!= LTTNG_OK
) {
1081 /* Add kernel context to kernel tracer */
1082 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1083 if (ret
!= LTTNG_OK
) {
1087 case LTTNG_DOMAIN_UST
:
1089 struct ltt_ust_session
*usess
= session
->ust_session
;
1092 unsigned int chan_count
=
1093 lttng_ht_get_count(usess
->domain_global
.channels
);
1094 if (chan_count
== 0) {
1095 struct lttng_channel
*attr
;
1096 /* Create default channel */
1097 attr
= channel_new_default_attr(domain
);
1099 ret
= LTTNG_ERR_FATAL
;
1103 ret
= channel_ust_create(usess
, domain
, attr
);
1104 if (ret
!= LTTNG_OK
) {
1111 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1112 if (ret
!= LTTNG_OK
) {
1118 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1119 case LTTNG_DOMAIN_UST_PID
:
1120 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1123 ret
= LTTNG_ERR_UND
;
1134 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1136 int cmd_enable_event(struct ltt_session
*session
, int domain
,
1137 char *channel_name
, struct lttng_event
*event
,
1138 struct lttng_filter_bytecode
*filter
, int wpipe
)
1141 struct lttng_channel
*attr
;
1145 assert(channel_name
);
1150 case LTTNG_DOMAIN_KERNEL
:
1152 struct ltt_kernel_channel
*kchan
;
1154 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1155 session
->kernel_session
);
1156 if (kchan
== NULL
) {
1157 attr
= channel_new_default_attr(domain
);
1159 ret
= LTTNG_ERR_FATAL
;
1162 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1164 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1165 if (ret
!= LTTNG_OK
) {
1172 /* Get the newly created kernel channel pointer */
1173 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1174 session
->kernel_session
);
1175 if (kchan
== NULL
) {
1176 /* This sould not happen... */
1177 ret
= LTTNG_ERR_FATAL
;
1181 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
1183 if (ret
!= LTTNG_OK
) {
1187 kernel_wait_quiescent(kernel_tracer_fd
);
1190 case LTTNG_DOMAIN_UST
:
1192 struct ltt_ust_channel
*uchan
;
1193 struct ltt_ust_session
*usess
= session
->ust_session
;
1197 /* Get channel from global UST domain */
1198 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1200 if (uchan
== NULL
) {
1201 /* Create default channel */
1202 attr
= channel_new_default_attr(domain
);
1204 ret
= LTTNG_ERR_FATAL
;
1207 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1209 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1210 if (ret
!= LTTNG_OK
) {
1216 /* Get the newly created channel reference back */
1217 uchan
= trace_ust_find_channel_by_name(
1218 usess
->domain_global
.channels
, channel_name
);
1222 /* At this point, the session and channel exist on the tracer */
1223 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
, filter
);
1224 if (ret
!= LTTNG_OK
) {
1230 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1231 case LTTNG_DOMAIN_UST_PID
:
1232 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1235 ret
= LTTNG_ERR_UND
;
1247 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1249 int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
1250 char *channel_name
, int event_type
,
1251 struct lttng_filter_bytecode
*filter
, int wpipe
)
1254 struct lttng_channel
*attr
;
1257 assert(channel_name
);
1262 case LTTNG_DOMAIN_KERNEL
:
1264 struct ltt_kernel_channel
*kchan
;
1266 assert(session
->kernel_session
);
1268 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1269 session
->kernel_session
);
1270 if (kchan
== NULL
) {
1271 /* Create default channel */
1272 attr
= channel_new_default_attr(domain
);
1274 ret
= LTTNG_ERR_FATAL
;
1277 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1279 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1280 if (ret
!= LTTNG_OK
) {
1286 /* Get the newly created kernel channel pointer */
1287 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1288 session
->kernel_session
);
1292 switch (event_type
) {
1293 case LTTNG_EVENT_SYSCALL
:
1294 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
1295 kchan
, kernel_tracer_fd
);
1297 case LTTNG_EVENT_TRACEPOINT
:
1299 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1300 * events already registered to the channel.
1302 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
1303 kchan
, kernel_tracer_fd
);
1305 case LTTNG_EVENT_ALL
:
1306 /* Enable syscalls and tracepoints */
1307 ret
= event_kernel_enable_all(session
->kernel_session
,
1308 kchan
, kernel_tracer_fd
);
1311 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1315 /* Manage return value */
1316 if (ret
!= LTTNG_OK
) {
1320 kernel_wait_quiescent(kernel_tracer_fd
);
1323 case LTTNG_DOMAIN_UST
:
1325 struct ltt_ust_channel
*uchan
;
1326 struct ltt_ust_session
*usess
= session
->ust_session
;
1330 /* Get channel from global UST domain */
1331 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1333 if (uchan
== NULL
) {
1334 /* Create default channel */
1335 attr
= channel_new_default_attr(domain
);
1337 ret
= LTTNG_ERR_FATAL
;
1340 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1342 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1343 if (ret
!= LTTNG_OK
) {
1349 /* Get the newly created channel reference back */
1350 uchan
= trace_ust_find_channel_by_name(
1351 usess
->domain_global
.channels
, channel_name
);
1355 /* At this point, the session and channel exist on the tracer */
1357 switch (event_type
) {
1358 case LTTNG_EVENT_ALL
:
1359 case LTTNG_EVENT_TRACEPOINT
:
1360 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
,
1362 if (ret
!= LTTNG_OK
) {
1367 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1371 /* Manage return value */
1372 if (ret
!= LTTNG_OK
) {
1379 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1380 case LTTNG_DOMAIN_UST_PID
:
1381 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1384 ret
= LTTNG_ERR_UND
;
1397 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1399 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1402 ssize_t nb_events
= 0;
1405 case LTTNG_DOMAIN_KERNEL
:
1406 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1407 if (nb_events
< 0) {
1408 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1412 case LTTNG_DOMAIN_UST
:
1413 nb_events
= ust_app_list_events(events
);
1414 if (nb_events
< 0) {
1415 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1420 ret
= LTTNG_ERR_UND
;
1427 /* Return negative value to differentiate return code */
1432 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1434 ssize_t
cmd_list_tracepoint_fields(int domain
,
1435 struct lttng_event_field
**fields
)
1438 ssize_t nb_fields
= 0;
1441 case LTTNG_DOMAIN_UST
:
1442 nb_fields
= ust_app_list_event_fields(fields
);
1443 if (nb_fields
< 0) {
1444 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1448 case LTTNG_DOMAIN_KERNEL
:
1449 default: /* fall-through */
1450 ret
= LTTNG_ERR_UND
;
1457 /* Return negative value to differentiate return code */
1462 * Command LTTNG_START_TRACE processed by the client thread.
1464 int cmd_start_trace(struct ltt_session
*session
)
1467 struct ltt_kernel_session
*ksession
;
1468 struct ltt_ust_session
*usess
;
1472 /* Ease our life a bit ;) */
1473 ksession
= session
->kernel_session
;
1474 usess
= session
->ust_session
;
1476 if (session
->enabled
) {
1477 /* Already started. */
1478 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1482 session
->enabled
= 1;
1484 ret
= setup_relayd(session
);
1485 if (ret
!= LTTNG_OK
) {
1486 ERR("Error setting up relayd for session %s", session
->name
);
1490 /* Kernel tracing */
1491 if (ksession
!= NULL
) {
1492 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1493 if (ret
!= LTTNG_OK
) {
1498 /* Flag session that trace should start automatically */
1500 usess
->start_trace
= 1;
1502 ret
= ust_app_start_trace_all(usess
);
1504 ret
= LTTNG_ERR_UST_START_FAIL
;
1509 session
->started
= 1;
1518 * Command LTTNG_STOP_TRACE processed by the client thread.
1520 int cmd_stop_trace(struct ltt_session
*session
)
1523 struct ltt_kernel_channel
*kchan
;
1524 struct ltt_kernel_session
*ksession
;
1525 struct ltt_ust_session
*usess
;
1530 ksession
= session
->kernel_session
;
1531 usess
= session
->ust_session
;
1533 if (!session
->enabled
) {
1534 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1538 session
->enabled
= 0;
1542 DBG("Stop kernel tracing");
1544 /* Flush metadata if exist */
1545 if (ksession
->metadata_stream_fd
>= 0) {
1546 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1548 ERR("Kernel metadata flush failed");
1552 /* Flush all buffers before stopping */
1553 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1554 ret
= kernel_flush_buffer(kchan
);
1556 ERR("Kernel flush buffer error");
1560 ret
= kernel_stop_session(ksession
);
1562 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1566 kernel_wait_quiescent(kernel_tracer_fd
);
1568 ksession
->started
= 0;
1572 usess
->start_trace
= 0;
1574 ret
= ust_app_stop_trace_all(usess
);
1576 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1581 session
->started
= 0;
1590 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1592 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1593 size_t nb_uri
, struct lttng_uri
*uris
)
1596 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1597 struct ltt_ust_session
*usess
= session
->ust_session
;
1598 struct consumer_output
*consumer
= NULL
;
1604 /* Can't enable consumer after session started. */
1605 if (session
->enabled
) {
1606 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1611 * This case switch makes sure the domain session has a temporary consumer
1612 * so the URL can be set.
1616 /* Code flow error. A session MUST always have a consumer object */
1617 assert(session
->consumer
);
1619 * The URL will be added to the tracing session consumer instead of a
1620 * specific domain consumer.
1622 consumer
= session
->consumer
;
1624 case LTTNG_DOMAIN_KERNEL
:
1625 /* Code flow error if we don't have a kernel session here. */
1628 /* Create consumer output if none exists */
1629 consumer
= ksess
->tmp_consumer
;
1630 if (consumer
== NULL
) {
1631 consumer
= consumer_copy_output(ksess
->consumer
);
1632 if (consumer
== NULL
) {
1633 ret
= LTTNG_ERR_FATAL
;
1636 /* Trash the consumer subdir, we are about to set a new one. */
1637 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1638 ksess
->tmp_consumer
= consumer
;
1642 case LTTNG_DOMAIN_UST
:
1643 /* Code flow error if we don't have a kernel session here. */
1646 /* Create consumer output if none exists */
1647 consumer
= usess
->tmp_consumer
;
1648 if (consumer
== NULL
) {
1649 consumer
= consumer_copy_output(usess
->consumer
);
1650 if (consumer
== NULL
) {
1651 ret
= LTTNG_ERR_FATAL
;
1654 /* Trash the consumer subdir, we are about to set a new one. */
1655 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1656 usess
->tmp_consumer
= consumer
;
1662 for (i
= 0; i
< nb_uri
; i
++) {
1663 struct consumer_socket
*socket
;
1664 struct lttng_ht_iter iter
;
1666 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1671 /* Don't send relayd socket if URI is NOT remote */
1672 if (uris
[i
].dtype
== LTTNG_DST_PATH
) {
1676 /* Try to send relayd URI to the consumer if exist. */
1678 cds_lfht_for_each_entry(consumer
->socks
->ht
, &iter
.iter
,
1679 socket
, node
.node
) {
1681 /* A socket in the HT should never have a negative fd */
1682 assert(socket
->fd
>= 0);
1684 pthread_mutex_lock(socket
->lock
);
1685 ret
= send_consumer_relayd_socket(domain
, session
, &uris
[i
],
1687 pthread_mutex_unlock(socket
->lock
);
1688 if (ret
!= LTTNG_OK
) {
1704 * Command LTTNG_CREATE_SESSION processed by the client thread.
1706 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1707 size_t nb_uri
, lttng_sock_cred
*creds
)
1711 struct ltt_session
*session
;
1716 * Verify if the session already exist
1718 * XXX: There is no need for the session lock list here since the caller
1719 * (process_client_msg) is holding it. We might want to change that so a
1720 * single command does not lock the entire session list.
1722 session
= session_find_by_name(name
);
1723 if (session
!= NULL
) {
1724 ret
= LTTNG_ERR_EXIST_SESS
;
1728 /* Create tracing session in the registry */
1729 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
1730 LTTNG_SOCK_GET_GID_CRED(creds
));
1731 if (ret
!= LTTNG_OK
) {
1736 * Get the newly created session pointer back
1738 * XXX: There is no need for the session lock list here since the caller
1739 * (process_client_msg) is holding it. We might want to change that so a
1740 * single command does not lock the entire session list.
1742 session
= session_find_by_name(name
);
1745 /* Create default consumer output for the session not yet created. */
1746 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1747 if (session
->consumer
== NULL
) {
1748 ret
= LTTNG_ERR_FATAL
;
1749 goto consumer_error
;
1753 * This means that the lttng_create_session call was called with the _path_
1754 * argument set to NULL.
1758 * At this point, we'll skip the consumer URI setup and create a
1759 * session with a NULL path which will flag the session to NOT spawn a
1762 DBG("Create session %s with NO uri, skipping consumer setup", name
);
1766 session
->start_consumer
= 1;
1768 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1769 if (ret
!= LTTNG_OK
) {
1770 goto consumer_error
;
1773 session
->consumer
->enabled
= 1;
1779 session_destroy(session
);
1786 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1788 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1791 struct ltt_ust_session
*usess
;
1792 struct ltt_kernel_session
*ksess
;
1797 usess
= session
->ust_session
;
1798 ksess
= session
->kernel_session
;
1800 /* Clean kernel session teardown */
1801 kernel_destroy_session(ksess
);
1803 /* UST session teardown */
1805 /* Close any relayd session */
1806 consumer_output_send_destroy_relayd(usess
->consumer
);
1808 /* Destroy every UST application related to this session. */
1809 ret
= ust_app_destroy_trace_all(usess
);
1811 ERR("Error in ust_app_destroy_trace_all");
1814 /* Clean up the rest. */
1815 trace_ust_destroy_session(usess
);
1819 * Must notify the kernel thread here to update it's poll set in order to
1820 * remove the channel(s)' fd just destroyed.
1822 ret
= notify_thread_pipe(wpipe
);
1824 PERROR("write kernel poll pipe");
1827 ret
= session_destroy(session
);
1833 * Command LTTNG_CALIBRATE processed by the client thread.
1835 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1840 case LTTNG_DOMAIN_KERNEL
:
1842 struct lttng_kernel_calibrate kcalibrate
;
1844 kcalibrate
.type
= calibrate
->type
;
1845 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1847 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1852 case LTTNG_DOMAIN_UST
:
1854 struct lttng_ust_calibrate ucalibrate
;
1856 ucalibrate
.type
= calibrate
->type
;
1857 ret
= ust_app_calibrate_glb(&ucalibrate
);
1859 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1865 ret
= LTTNG_ERR_UND
;
1876 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1878 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1879 const char *sock_path
, struct consumer_data
*cdata
)
1882 struct consumer_socket
*socket
;
1889 case LTTNG_DOMAIN_KERNEL
:
1891 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1895 /* Can't register a consumer if there is already one */
1896 if (ksess
->consumer_fds_sent
!= 0) {
1897 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1901 sock
= lttcomm_connect_unix_sock(sock_path
);
1903 ret
= LTTNG_ERR_CONNECT_FAIL
;
1907 socket
= consumer_allocate_socket(sock
);
1908 if (socket
== NULL
) {
1911 PERROR("close register consumer");
1913 ret
= LTTNG_ERR_FATAL
;
1917 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1918 if (socket
->lock
== NULL
) {
1919 PERROR("zmalloc pthread mutex");
1920 ret
= LTTNG_ERR_FATAL
;
1923 pthread_mutex_init(socket
->lock
, NULL
);
1924 socket
->registered
= 1;
1927 consumer_add_socket(socket
, ksess
->consumer
);
1930 pthread_mutex_lock(&cdata
->pid_mutex
);
1932 pthread_mutex_unlock(&cdata
->pid_mutex
);
1937 /* TODO: Userspace tracing */
1938 ret
= LTTNG_ERR_UND
;
1949 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1951 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1952 struct lttng_domain
**domains
)
1957 if (session
->kernel_session
!= NULL
) {
1958 DBG3("Listing domains found kernel domain");
1962 if (session
->ust_session
!= NULL
) {
1963 DBG3("Listing domains found UST global domain");
1967 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1968 if (*domains
== NULL
) {
1969 ret
= LTTNG_ERR_FATAL
;
1973 if (session
->kernel_session
!= NULL
) {
1974 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1978 if (session
->ust_session
!= NULL
) {
1979 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1986 /* Return negative value to differentiate return code */
1992 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1994 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1995 struct lttng_channel
**channels
)
1998 ssize_t nb_chan
= 0;
2001 case LTTNG_DOMAIN_KERNEL
:
2002 if (session
->kernel_session
!= NULL
) {
2003 nb_chan
= session
->kernel_session
->channel_count
;
2005 DBG3("Number of kernel channels %zd", nb_chan
);
2007 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2010 case LTTNG_DOMAIN_UST
:
2011 if (session
->ust_session
!= NULL
) {
2012 nb_chan
= lttng_ht_get_count(
2013 session
->ust_session
->domain_global
.channels
);
2015 DBG3("Number of UST global channels %zd", nb_chan
);
2017 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2022 ret
= LTTNG_ERR_UND
;
2027 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2028 if (*channels
== NULL
) {
2029 ret
= LTTNG_ERR_FATAL
;
2033 list_lttng_channels(domain
, session
, *channels
);
2036 /* Ret value was set in the domain switch case */
2043 /* Return negative value to differentiate return code */
2048 * Command LTTNG_LIST_EVENTS processed by the client thread.
2050 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2051 char *channel_name
, struct lttng_event
**events
)
2054 ssize_t nb_event
= 0;
2057 case LTTNG_DOMAIN_KERNEL
:
2058 if (session
->kernel_session
!= NULL
) {
2059 nb_event
= list_lttng_kernel_events(channel_name
,
2060 session
->kernel_session
, events
);
2063 case LTTNG_DOMAIN_UST
:
2065 if (session
->ust_session
!= NULL
) {
2066 nb_event
= list_lttng_ust_global_events(channel_name
,
2067 &session
->ust_session
->domain_global
, events
);
2072 ret
= LTTNG_ERR_UND
;
2079 /* Return negative value to differentiate return code */
2084 * Using the session list, filled a lttng_session array to send back to the
2085 * client for session listing.
2087 * The session list lock MUST be acquired before calling this function. Use
2088 * session_lock_list() and session_unlock_list().
2090 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2095 struct ltt_session
*session
;
2096 struct ltt_session_list
*list
= session_get_list();
2098 DBG("Getting all available session for UID %d GID %d",
2101 * Iterate over session list and append data after the control struct in
2104 cds_list_for_each_entry(session
, &list
->head
, list
) {
2106 * Only list the sessions the user can control.
2108 if (!session_access_ok(session
, uid
, gid
)) {
2112 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2113 struct ltt_ust_session
*usess
= session
->ust_session
;
2115 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2116 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2117 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2118 ret
= build_network_session_path(sessions
[i
].path
,
2119 sizeof(session
[i
].path
), session
);
2121 ret
= snprintf(sessions
[i
].path
, sizeof(session
[i
].path
), "%s",
2122 session
->consumer
->dst
.trace_path
);
2125 PERROR("snprintf session path");
2129 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2130 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2131 sessions
[i
].enabled
= session
->enabled
;
2137 * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
2139 int cmd_disable_consumer(int domain
, struct ltt_session
*session
)
2142 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2143 struct ltt_ust_session
*usess
= session
->ust_session
;
2144 struct consumer_output
*consumer
;
2148 if (session
->enabled
) {
2149 /* Can't disable consumer on an already started session */
2150 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2154 if (!session
->start_consumer
) {
2155 ret
= LTTNG_ERR_NO_CONSUMER
;
2161 DBG("Disable tracing session %s consumer", session
->name
);
2162 consumer
= session
->consumer
;
2164 case LTTNG_DOMAIN_KERNEL
:
2165 /* Code flow error if we don't have a kernel session here. */
2168 DBG("Disabling kernel consumer");
2169 consumer
= ksess
->consumer
;
2172 case LTTNG_DOMAIN_UST
:
2173 /* Code flow error if we don't have a UST session here. */
2176 DBG("Disabling UST consumer");
2177 consumer
= usess
->consumer
;
2181 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2186 consumer
->enabled
= 0;
2187 /* Success at this point */
2190 ret
= LTTNG_ERR_NO_CONSUMER
;
2198 * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
2200 int cmd_enable_consumer(int domain
, struct ltt_session
*session
)
2203 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2204 struct ltt_ust_session
*usess
= session
->ust_session
;
2205 struct consumer_output
*consumer
= NULL
;
2209 /* Can't enable consumer after session started. */
2210 if (session
->enabled
) {
2211 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2217 assert(session
->consumer
);
2218 consumer
= session
->consumer
;
2220 case LTTNG_DOMAIN_KERNEL
:
2221 /* Code flow error if we don't have a kernel session here. */
2225 * Check if we have already sent fds to the consumer. In that case,
2226 * the enable-consumer command can't be used because a start trace
2227 * had previously occured.
2229 if (ksess
->consumer_fds_sent
) {
2230 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2234 consumer
= ksess
->tmp_consumer
;
2235 if (consumer
== NULL
) {
2237 /* No temp. consumer output exists. Using the current one. */
2238 DBG3("No temporary consumer. Using default");
2239 consumer
= ksess
->consumer
;
2243 switch (consumer
->type
) {
2244 case CONSUMER_DST_LOCAL
:
2245 DBG2("Consumer output is local. Creating directory(ies)");
2247 /* Create directory(ies) */
2248 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2249 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2251 if (ret
!= -EEXIST
) {
2252 ERR("Trace directory creation error");
2253 ret
= LTTNG_ERR_FATAL
;
2258 case CONSUMER_DST_NET
:
2259 DBG2("Consumer output is network. Validating URIs");
2260 /* Validate if we have both control and data path set. */
2261 if (!consumer
->dst
.net
.control_isset
) {
2262 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2266 if (!consumer
->dst
.net
.data_isset
) {
2267 ret
= LTTNG_ERR_URL_DATA_MISS
;
2271 /* Check established network session state */
2272 if (session
->net_handle
== 0) {
2273 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2274 ERR("Session network handle is not set on enable-consumer");
2283 * This is race free for now since the session lock is acquired before
2284 * ending up in this function. No other threads can access this kernel
2285 * session without this lock hence freeing the consumer output object
2289 /* Destroy current consumer. We are about to replace it */
2290 consumer_destroy_output(ksess
->consumer
);
2292 ksess
->consumer
= consumer
;
2293 ksess
->tmp_consumer
= NULL
;
2296 case LTTNG_DOMAIN_UST
:
2297 /* Code flow error if we don't have a UST session here. */
2301 * Check if we have already sent fds to the consumer. In that case,
2302 * the enable-consumer command can't be used because a start trace
2303 * had previously occured.
2305 if (usess
->start_trace
) {
2306 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2310 consumer
= usess
->tmp_consumer
;
2311 if (consumer
== NULL
) {
2313 /* No temp. consumer output exists. Using the current one. */
2314 DBG3("No temporary consumer. Using default");
2315 consumer
= usess
->consumer
;
2319 switch (consumer
->type
) {
2320 case CONSUMER_DST_LOCAL
:
2321 DBG2("Consumer output is local. Creating directory(ies)");
2323 /* Create directory(ies) */
2324 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2325 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2327 if (ret
!= -EEXIST
) {
2328 ERR("Trace directory creation error");
2329 ret
= LTTNG_ERR_FATAL
;
2334 case CONSUMER_DST_NET
:
2335 DBG2("Consumer output is network. Validating URIs");
2336 /* Validate if we have both control and data path set. */
2337 if (!consumer
->dst
.net
.control_isset
) {
2338 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2342 if (!consumer
->dst
.net
.data_isset
) {
2343 ret
= LTTNG_ERR_URL_DATA_MISS
;
2347 /* Check established network session state */
2348 if (session
->net_handle
== 0) {
2349 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2350 DBG2("Session network handle is not set on enable-consumer");
2354 if (consumer
->net_seq_index
== -1) {
2355 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2356 DBG2("Network index is not set on the consumer");
2365 * This is race free for now since the session lock is acquired before
2366 * ending up in this function. No other threads can access this kernel
2367 * session without this lock hence freeing the consumer output object
2371 /* Destroy current consumer. We are about to replace it */
2372 consumer_destroy_output(usess
->consumer
);
2374 usess
->consumer
= consumer
;
2375 usess
->tmp_consumer
= NULL
;
2380 session
->start_consumer
= 1;
2384 consumer
->enabled
= 1;
2385 /* Success at this point */
2388 /* Should not really happend... */
2389 ret
= LTTNG_ERR_NO_CONSUMER
;
2397 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2398 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2400 int cmd_data_pending(struct ltt_session
*session
)
2403 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2404 struct ltt_ust_session
*usess
= session
->ust_session
;
2408 /* Session MUST be stopped to ask for data availability. */
2409 if (session
->enabled
) {
2410 ret
= LTTNG_ERR_SESSION_STARTED
;
2414 if (ksess
&& ksess
->consumer
) {
2415 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2417 /* Data is still being extracted for the kernel. */
2422 if (usess
&& usess
->consumer
) {
2423 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2425 /* Data is still being extracted for the kernel. */
2430 /* Data is ready to be read by a viewer */
2438 * Init command subsystem.
2443 * Set network sequence index to 1 for streams to match a relayd socket on
2444 * the consumer side.
2446 uatomic_set(&relayd_net_seq_idx
, 1);
2448 DBG("Command subsystem initialized");