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
;
155 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
156 &iter
.iter
, uchan
, node
.node
) {
157 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
158 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
159 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
160 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
161 channels
[i
].attr
.switch_timer_interval
=
162 uchan
->attr
.switch_timer_interval
;
163 channels
[i
].attr
.read_timer_interval
=
164 uchan
->attr
.read_timer_interval
;
165 channels
[i
].enabled
= uchan
->enabled
;
166 switch (uchan
->attr
.output
) {
169 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
182 * Create a list of ust global domain events.
184 static int list_lttng_ust_global_events(char *channel_name
,
185 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
188 unsigned int nb_event
= 0;
189 struct lttng_ht_iter iter
;
190 struct lttng_ht_node_str
*node
;
191 struct ltt_ust_channel
*uchan
;
192 struct ltt_ust_event
*uevent
;
193 struct lttng_event
*tmp
;
195 DBG("Listing UST global events for channel %s", channel_name
);
199 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
200 node
= lttng_ht_iter_get_node_str(&iter
);
202 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
206 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
208 nb_event
+= lttng_ht_get_count(uchan
->events
);
215 DBG3("Listing UST global %d events", nb_event
);
217 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
219 ret
= LTTNG_ERR_FATAL
;
223 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
224 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
225 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
226 tmp
[i
].enabled
= uevent
->enabled
;
228 switch (uevent
->attr
.instrumentation
) {
229 case LTTNG_UST_TRACEPOINT
:
230 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
232 case LTTNG_UST_PROBE
:
233 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
235 case LTTNG_UST_FUNCTION
:
236 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
240 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
241 switch (uevent
->attr
.loglevel_type
) {
242 case LTTNG_UST_LOGLEVEL_ALL
:
243 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
245 case LTTNG_UST_LOGLEVEL_RANGE
:
246 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
248 case LTTNG_UST_LOGLEVEL_SINGLE
:
249 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
252 if (uevent
->filter
) {
267 * Fill lttng_event array of all kernel events in the channel.
269 static int list_lttng_kernel_events(char *channel_name
,
270 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
273 unsigned int nb_event
;
274 struct ltt_kernel_event
*event
;
275 struct ltt_kernel_channel
*kchan
;
277 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
279 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
283 nb_event
= kchan
->event_count
;
285 DBG("Listing events for channel %s", kchan
->channel
->name
);
291 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
292 if (*events
== NULL
) {
293 ret
= LTTNG_ERR_FATAL
;
297 /* Kernel channels */
298 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
299 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
300 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
301 (*events
)[i
].enabled
= event
->enabled
;
303 switch (event
->event
->instrumentation
) {
304 case LTTNG_KERNEL_TRACEPOINT
:
305 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
307 case LTTNG_KERNEL_KPROBE
:
308 case LTTNG_KERNEL_KRETPROBE
:
309 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
310 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
311 sizeof(struct lttng_kernel_kprobe
));
313 case LTTNG_KERNEL_FUNCTION
:
314 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
315 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
316 sizeof(struct lttng_kernel_function
));
318 case LTTNG_KERNEL_NOOP
:
319 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
321 case LTTNG_KERNEL_SYSCALL
:
322 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
324 case LTTNG_KERNEL_ALL
:
335 /* Negate the error code to differentiate the size from an error */
340 * Add URI so the consumer output object. Set the correct path depending on the
341 * domain adding the default trace directory.
343 static int add_uri_to_consumer(struct consumer_output
*consumer
,
344 struct lttng_uri
*uri
, int domain
, const char *session_name
)
347 const char *default_trace_dir
;
351 if (consumer
== NULL
) {
352 DBG("No consumer detected. Don't add URI. Stopping.");
353 ret
= LTTNG_ERR_NO_CONSUMER
;
358 case LTTNG_DOMAIN_KERNEL
:
359 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
361 case LTTNG_DOMAIN_UST
:
362 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
366 * This case is possible is we try to add the URI to the global tracing
367 * session consumer object which in this case there is no subdir.
369 default_trace_dir
= "";
372 switch (uri
->dtype
) {
375 DBG2("Setting network URI to consumer");
377 /* Set URI into consumer output object */
378 ret
= consumer_set_network_uri(consumer
, uri
);
380 ret
= LTTNG_ERR_FATAL
;
382 } else if (ret
== 1) {
384 * URI was the same in the consumer so we do not append the subdir
385 * again so to not duplicate output dir.
390 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
391 ret
= consumer_set_subdir(consumer
, session_name
);
393 ret
= LTTNG_ERR_FATAL
;
398 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
399 /* On a new subdir, reappend the default trace dir. */
400 strncat(consumer
->subdir
, default_trace_dir
,
401 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
402 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
407 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
408 memset(consumer
->dst
.trace_path
, 0,
409 sizeof(consumer
->dst
.trace_path
));
410 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
411 sizeof(consumer
->dst
.trace_path
));
412 /* Append default trace dir */
413 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
414 sizeof(consumer
->dst
.trace_path
) -
415 strlen(consumer
->dst
.trace_path
) - 1);
416 /* Flag consumer as local. */
417 consumer
->type
= CONSUMER_DST_LOCAL
;
426 * Init tracing by creating trace directory and sending fds kernel consumer.
428 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
431 struct lttng_ht_iter iter
;
432 struct consumer_socket
*socket
;
436 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
437 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
439 /* Code flow error */
440 assert(socket
->fd
>= 0);
442 pthread_mutex_lock(socket
->lock
);
443 ret
= kernel_consumer_send_session(socket
->fd
, session
);
444 pthread_mutex_unlock(socket
->lock
);
446 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
457 * Create a socket to the relayd using the URI.
459 * On success, the relayd_sock pointer is set to the created socket.
460 * Else, it's stays untouched and a lttcomm error code is returned.
462 static int create_connect_relayd(struct consumer_output
*output
,
463 const char *session_name
, struct lttng_uri
*uri
,
464 struct lttcomm_sock
**relayd_sock
)
467 struct lttcomm_sock
*sock
;
469 /* Create socket object from URI */
470 sock
= lttcomm_alloc_sock_from_uri(uri
);
472 ret
= LTTNG_ERR_FATAL
;
476 ret
= lttcomm_create_sock(sock
);
478 ret
= LTTNG_ERR_FATAL
;
482 /* Connect to relayd so we can proceed with a session creation. */
483 ret
= relayd_connect(sock
);
485 ERR("Unable to reach lttng-relayd");
486 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
490 /* Create socket for control stream. */
491 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
492 DBG3("Creating relayd stream socket from URI");
494 /* Check relayd version */
495 ret
= relayd_version_check(sock
, RELAYD_VERSION_COMM_MAJOR
,
496 RELAYD_VERSION_COMM_MINOR
);
498 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
501 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
502 DBG3("Creating relayd data socket from URI");
504 /* Command is not valid */
505 ERR("Relayd invalid stream type: %d", uri
->stype
);
506 ret
= LTTNG_ERR_INVALID
;
516 (void) relayd_close(sock
);
520 lttcomm_destroy_sock(sock
);
527 * Connect to the relayd using URI and send the socket to the right consumer.
529 static int send_consumer_relayd_socket(int domain
, struct ltt_session
*session
,
530 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
534 struct lttcomm_sock
*sock
= NULL
;
536 /* Set the network sequence index if not set. */
537 if (consumer
->net_seq_index
== -1) {
539 * Increment net_seq_idx because we are about to transfer the
540 * new relayd socket to the consumer.
542 uatomic_inc(&relayd_net_seq_idx
);
543 /* Assign unique key so the consumer can match streams */
544 uatomic_set(&consumer
->net_seq_index
,
545 uatomic_read(&relayd_net_seq_idx
));
548 /* Connect to relayd and make version check if uri is the control. */
549 ret
= create_connect_relayd(consumer
, session
->name
, relayd_uri
, &sock
);
550 if (ret
!= LTTNG_OK
) {
554 /* If the control socket is connected, network session is ready */
555 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
556 session
->net_handle
= 1;
559 /* Send relayd socket to consumer. */
560 ret
= consumer_send_relayd_socket(consumer_fd
, sock
,
561 consumer
, relayd_uri
->stype
);
563 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
567 /* Flag that the corresponding socket was sent. */
568 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
569 consumer
->dst
.net
.control_sock_sent
= 1;
570 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
571 consumer
->dst
.net
.data_sock_sent
= 1;
577 * Close socket which was dup on the consumer side. The session daemon does
578 * NOT keep track of the relayd socket(s) once transfer to the consumer.
583 (void) relayd_close(sock
);
584 lttcomm_destroy_sock(sock
);
591 * Send both relayd sockets to a specific consumer and domain. This is a
592 * helper function to facilitate sending the information to the consumer for a
595 static int send_consumer_relayd_sockets(int domain
,
596 struct ltt_session
*session
, struct consumer_output
*consumer
, int fd
)
603 /* Sending control relayd socket. */
604 if (!consumer
->dst
.net
.control_sock_sent
) {
605 ret
= send_consumer_relayd_socket(domain
, session
,
606 &consumer
->dst
.net
.control
, consumer
, fd
);
607 if (ret
!= LTTNG_OK
) {
612 /* Sending data relayd socket. */
613 if (!consumer
->dst
.net
.data_sock_sent
) {
614 ret
= send_consumer_relayd_socket(domain
, session
,
615 &consumer
->dst
.net
.data
, consumer
, fd
);
616 if (ret
!= LTTNG_OK
) {
626 * Setup relayd connections for a tracing session. First creates the socket to
627 * the relayd and send them to the right domain consumer. Consumer type MUST be
630 static int setup_relayd(struct ltt_session
*session
)
633 struct ltt_ust_session
*usess
;
634 struct ltt_kernel_session
*ksess
;
635 struct consumer_socket
*socket
;
636 struct lttng_ht_iter iter
;
640 usess
= session
->ust_session
;
641 ksess
= session
->kernel_session
;
643 DBG2("Setting relayd for session %s", session
->name
);
645 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
646 && usess
->consumer
->enabled
) {
647 /* For each consumer socket, send relayd sockets */
648 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
650 /* Code flow error */
651 assert(socket
->fd
>= 0);
653 pthread_mutex_lock(socket
->lock
);
654 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
,
655 usess
->consumer
, socket
->fd
);
656 pthread_mutex_unlock(socket
->lock
);
657 if (ret
!= LTTNG_OK
) {
663 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
664 && ksess
->consumer
->enabled
) {
665 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
667 /* Code flow error */
668 assert(socket
->fd
>= 0);
670 pthread_mutex_lock(socket
->lock
);
671 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
,
672 ksess
->consumer
, socket
->fd
);
673 pthread_mutex_unlock(socket
->lock
);
674 if (ret
!= LTTNG_OK
) {
685 * Start a kernel session by opening all necessary streams.
687 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
690 struct ltt_kernel_channel
*kchan
;
692 /* Open kernel metadata */
693 if (ksess
->metadata
== NULL
) {
694 ret
= kernel_open_metadata(ksess
);
696 ret
= LTTNG_ERR_KERN_META_FAIL
;
701 /* Open kernel metadata stream */
702 if (ksess
->metadata_stream_fd
< 0) {
703 ret
= kernel_open_metadata_stream(ksess
);
705 ERR("Kernel create metadata stream failed");
706 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
711 /* For each channel */
712 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
713 if (kchan
->stream_count
== 0) {
714 ret
= kernel_open_channel_stream(kchan
);
716 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
719 /* Update the stream global counter */
720 ksess
->stream_count_global
+= ret
;
724 /* Setup kernel consumer socket and send fds to it */
725 ret
= init_kernel_tracing(ksess
);
727 ret
= LTTNG_ERR_KERN_START_FAIL
;
731 /* This start the kernel tracing */
732 ret
= kernel_start_session(ksess
);
734 ret
= LTTNG_ERR_KERN_START_FAIL
;
738 /* Quiescent wait after starting trace */
739 kernel_wait_quiescent(kernel_tracer_fd
);
750 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
752 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
756 struct ltt_ust_session
*usess
;
758 usess
= session
->ust_session
;
761 case LTTNG_DOMAIN_KERNEL
:
763 ret
= channel_kernel_disable(session
->kernel_session
,
765 if (ret
!= LTTNG_OK
) {
769 kernel_wait_quiescent(kernel_tracer_fd
);
772 case LTTNG_DOMAIN_UST
:
774 struct ltt_ust_channel
*uchan
;
775 struct lttng_ht
*chan_ht
;
777 chan_ht
= usess
->domain_global
.channels
;
779 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
781 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
785 ret
= channel_ust_disable(usess
, domain
, uchan
);
786 if (ret
!= LTTNG_OK
) {
792 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
793 case LTTNG_DOMAIN_UST_EXEC_NAME
:
794 case LTTNG_DOMAIN_UST_PID
:
797 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
808 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
810 * The wpipe arguments is used as a notifier for the kernel thread.
812 int cmd_enable_channel(struct ltt_session
*session
,
813 int domain
, struct lttng_channel
*attr
, int wpipe
)
816 struct ltt_ust_session
*usess
= session
->ust_session
;
817 struct lttng_ht
*chan_ht
;
822 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
825 case LTTNG_DOMAIN_KERNEL
:
827 struct ltt_kernel_channel
*kchan
;
829 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
830 session
->kernel_session
);
832 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
834 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
837 if (ret
!= LTTNG_OK
) {
841 kernel_wait_quiescent(kernel_tracer_fd
);
844 * If the session was previously started, start as well this newly
845 * created kernel session so the events/channels enabled *after* the
846 * start actually work.
848 if (session
->started
&& !session
->kernel_session
->started
) {
849 ret
= start_kernel_session(session
->kernel_session
, wpipe
);
850 if (ret
!= LTTNG_OK
) {
856 case LTTNG_DOMAIN_UST
:
858 struct ltt_ust_channel
*uchan
;
860 chan_ht
= usess
->domain_global
.channels
;
862 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
864 ret
= channel_ust_create(usess
, domain
, attr
);
866 ret
= channel_ust_enable(usess
, domain
, uchan
);
869 /* Start the UST session if the session was already started. */
870 if (session
->started
&& !usess
->start_trace
) {
871 ret
= ust_app_start_trace_all(usess
);
873 ret
= LTTNG_ERR_UST_START_FAIL
;
877 usess
->start_trace
= 1;
882 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
883 case LTTNG_DOMAIN_UST_EXEC_NAME
:
884 case LTTNG_DOMAIN_UST_PID
:
887 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
897 * Command LTTNG_DISABLE_EVENT processed by the client thread.
899 int cmd_disable_event(struct ltt_session
*session
, int domain
,
900 char *channel_name
, char *event_name
)
905 case LTTNG_DOMAIN_KERNEL
:
907 struct ltt_kernel_channel
*kchan
;
908 struct ltt_kernel_session
*ksess
;
910 ksess
= session
->kernel_session
;
912 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
914 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
918 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
919 if (ret
!= LTTNG_OK
) {
923 kernel_wait_quiescent(kernel_tracer_fd
);
926 case LTTNG_DOMAIN_UST
:
928 struct ltt_ust_channel
*uchan
;
929 struct ltt_ust_session
*usess
;
931 usess
= session
->ust_session
;
933 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
936 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
940 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
941 if (ret
!= LTTNG_OK
) {
945 DBG3("Disable UST event %s in channel %s completed", event_name
,
950 case LTTNG_DOMAIN_UST_EXEC_NAME
:
951 case LTTNG_DOMAIN_UST_PID
:
952 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
966 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
968 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
974 case LTTNG_DOMAIN_KERNEL
:
976 struct ltt_kernel_session
*ksess
;
977 struct ltt_kernel_channel
*kchan
;
979 ksess
= session
->kernel_session
;
981 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
983 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
987 ret
= event_kernel_disable_all(ksess
, kchan
);
988 if (ret
!= LTTNG_OK
) {
992 kernel_wait_quiescent(kernel_tracer_fd
);
995 case LTTNG_DOMAIN_UST
:
997 struct ltt_ust_session
*usess
;
998 struct ltt_ust_channel
*uchan
;
1000 usess
= session
->ust_session
;
1002 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1004 if (uchan
== NULL
) {
1005 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1009 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
1014 DBG3("Disable all UST events in channel %s completed", channel_name
);
1019 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1020 case LTTNG_DOMAIN_UST_PID
:
1021 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1024 ret
= LTTNG_ERR_UND
;
1035 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1037 int cmd_add_context(struct ltt_session
*session
, int domain
,
1038 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1043 case LTTNG_DOMAIN_KERNEL
:
1044 assert(session
->kernel_session
);
1046 if (session
->kernel_session
->channel_count
== 0) {
1047 /* Create default channel */
1048 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1049 if (ret
!= LTTNG_OK
) {
1054 /* Add kernel context to kernel tracer */
1055 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1056 if (ret
!= LTTNG_OK
) {
1060 case LTTNG_DOMAIN_UST
:
1062 struct ltt_ust_session
*usess
= session
->ust_session
;
1065 unsigned int chan_count
=
1066 lttng_ht_get_count(usess
->domain_global
.channels
);
1067 if (chan_count
== 0) {
1068 struct lttng_channel
*attr
;
1069 /* Create default channel */
1070 attr
= channel_new_default_attr(domain
);
1072 ret
= LTTNG_ERR_FATAL
;
1076 ret
= channel_ust_create(usess
, domain
, attr
);
1077 if (ret
!= LTTNG_OK
) {
1084 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1085 if (ret
!= LTTNG_OK
) {
1091 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1092 case LTTNG_DOMAIN_UST_PID
:
1093 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1096 ret
= LTTNG_ERR_UND
;
1107 * Command LTTNG_SET_FILTER processed by the client thread.
1109 int cmd_set_filter(struct ltt_session
*session
, int domain
,
1110 char *channel_name
, struct lttng_event
*event
,
1111 struct lttng_filter_bytecode
*bytecode
)
1116 case LTTNG_DOMAIN_KERNEL
:
1117 ret
= LTTNG_ERR_FATAL
;
1119 case LTTNG_DOMAIN_UST
:
1121 struct ltt_ust_session
*usess
= session
->ust_session
;
1123 ret
= filter_ust_set(usess
, domain
, bytecode
, event
, channel_name
);
1124 if (ret
!= LTTNG_OK
) {
1130 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1131 case LTTNG_DOMAIN_UST_PID
:
1132 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1135 ret
= LTTNG_ERR_UND
;
1148 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1150 int cmd_enable_event(struct ltt_session
*session
, int domain
,
1151 char *channel_name
, struct lttng_event
*event
, int wpipe
)
1154 struct lttng_channel
*attr
;
1158 assert(channel_name
);
1161 case LTTNG_DOMAIN_KERNEL
:
1163 struct ltt_kernel_channel
*kchan
;
1165 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1166 session
->kernel_session
);
1167 if (kchan
== NULL
) {
1168 attr
= channel_new_default_attr(domain
);
1170 ret
= LTTNG_ERR_FATAL
;
1173 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1175 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1176 if (ret
!= LTTNG_OK
) {
1183 /* Get the newly created kernel channel pointer */
1184 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1185 session
->kernel_session
);
1186 if (kchan
== NULL
) {
1187 /* This sould not happen... */
1188 ret
= LTTNG_ERR_FATAL
;
1192 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
1194 if (ret
!= LTTNG_OK
) {
1198 kernel_wait_quiescent(kernel_tracer_fd
);
1201 case LTTNG_DOMAIN_UST
:
1203 struct ltt_ust_channel
*uchan
;
1204 struct ltt_ust_session
*usess
= session
->ust_session
;
1208 /* Get channel from global UST domain */
1209 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1211 if (uchan
== NULL
) {
1212 /* Create default channel */
1213 attr
= channel_new_default_attr(domain
);
1215 ret
= LTTNG_ERR_FATAL
;
1218 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1220 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1221 if (ret
!= LTTNG_OK
) {
1227 /* Get the newly created channel reference back */
1228 uchan
= trace_ust_find_channel_by_name(
1229 usess
->domain_global
.channels
, channel_name
);
1233 /* At this point, the session and channel exist on the tracer */
1234 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
);
1235 if (ret
!= LTTNG_OK
) {
1241 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1242 case LTTNG_DOMAIN_UST_PID
:
1243 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1246 ret
= LTTNG_ERR_UND
;
1257 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1259 int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
1260 char *channel_name
, int event_type
, int wpipe
)
1263 struct lttng_channel
*attr
;
1266 assert(channel_name
);
1269 case LTTNG_DOMAIN_KERNEL
:
1271 struct ltt_kernel_channel
*kchan
;
1273 assert(session
->kernel_session
);
1275 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1276 session
->kernel_session
);
1277 if (kchan
== NULL
) {
1278 /* Create default channel */
1279 attr
= channel_new_default_attr(domain
);
1281 ret
= LTTNG_ERR_FATAL
;
1284 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1286 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1287 if (ret
!= LTTNG_OK
) {
1293 /* Get the newly created kernel channel pointer */
1294 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1295 session
->kernel_session
);
1299 switch (event_type
) {
1300 case LTTNG_EVENT_SYSCALL
:
1301 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
1302 kchan
, kernel_tracer_fd
);
1304 case LTTNG_EVENT_TRACEPOINT
:
1306 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1307 * events already registered to the channel.
1309 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
1310 kchan
, kernel_tracer_fd
);
1312 case LTTNG_EVENT_ALL
:
1313 /* Enable syscalls and tracepoints */
1314 ret
= event_kernel_enable_all(session
->kernel_session
,
1315 kchan
, kernel_tracer_fd
);
1318 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1322 /* Manage return value */
1323 if (ret
!= LTTNG_OK
) {
1327 kernel_wait_quiescent(kernel_tracer_fd
);
1330 case LTTNG_DOMAIN_UST
:
1332 struct ltt_ust_channel
*uchan
;
1333 struct ltt_ust_session
*usess
= session
->ust_session
;
1337 /* Get channel from global UST domain */
1338 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1340 if (uchan
== NULL
) {
1341 /* Create default channel */
1342 attr
= channel_new_default_attr(domain
);
1344 ret
= LTTNG_ERR_FATAL
;
1347 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1349 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1350 if (ret
!= LTTNG_OK
) {
1356 /* Get the newly created channel reference back */
1357 uchan
= trace_ust_find_channel_by_name(
1358 usess
->domain_global
.channels
, channel_name
);
1362 /* At this point, the session and channel exist on the tracer */
1364 switch (event_type
) {
1365 case LTTNG_EVENT_ALL
:
1366 case LTTNG_EVENT_TRACEPOINT
:
1367 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
);
1368 if (ret
!= LTTNG_OK
) {
1373 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1377 /* Manage return value */
1378 if (ret
!= LTTNG_OK
) {
1385 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1386 case LTTNG_DOMAIN_UST_PID
:
1387 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1390 ret
= LTTNG_ERR_UND
;
1402 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1404 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1407 ssize_t nb_events
= 0;
1410 case LTTNG_DOMAIN_KERNEL
:
1411 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1412 if (nb_events
< 0) {
1413 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1417 case LTTNG_DOMAIN_UST
:
1418 nb_events
= ust_app_list_events(events
);
1419 if (nb_events
< 0) {
1420 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1425 ret
= LTTNG_ERR_UND
;
1432 /* Return negative value to differentiate return code */
1437 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1439 ssize_t
cmd_list_tracepoint_fields(int domain
,
1440 struct lttng_event_field
**fields
)
1443 ssize_t nb_fields
= 0;
1446 case LTTNG_DOMAIN_UST
:
1447 nb_fields
= ust_app_list_event_fields(fields
);
1448 if (nb_fields
< 0) {
1449 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1453 case LTTNG_DOMAIN_KERNEL
:
1454 default: /* fall-through */
1455 ret
= LTTNG_ERR_UND
;
1462 /* Return negative value to differentiate return code */
1467 * Command LTTNG_START_TRACE processed by the client thread.
1469 int cmd_start_trace(struct ltt_session
*session
)
1472 struct ltt_kernel_session
*ksession
;
1473 struct ltt_ust_session
*usess
;
1477 /* Ease our life a bit ;) */
1478 ksession
= session
->kernel_session
;
1479 usess
= session
->ust_session
;
1481 if (session
->enabled
) {
1482 /* Already started. */
1483 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1487 session
->enabled
= 1;
1489 ret
= setup_relayd(session
);
1490 if (ret
!= LTTNG_OK
) {
1491 ERR("Error setting up relayd for session %s", session
->name
);
1495 /* Kernel tracing */
1496 if (ksession
!= NULL
) {
1497 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1498 if (ret
!= LTTNG_OK
) {
1503 /* Flag session that trace should start automatically */
1505 usess
->start_trace
= 1;
1507 ret
= ust_app_start_trace_all(usess
);
1509 ret
= LTTNG_ERR_UST_START_FAIL
;
1514 session
->started
= 1;
1523 * Command LTTNG_STOP_TRACE processed by the client thread.
1525 int cmd_stop_trace(struct ltt_session
*session
)
1528 struct ltt_kernel_channel
*kchan
;
1529 struct ltt_kernel_session
*ksession
;
1530 struct ltt_ust_session
*usess
;
1535 ksession
= session
->kernel_session
;
1536 usess
= session
->ust_session
;
1538 if (!session
->enabled
) {
1539 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1543 session
->enabled
= 0;
1547 DBG("Stop kernel tracing");
1549 /* Flush metadata if exist */
1550 if (ksession
->metadata_stream_fd
>= 0) {
1551 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1553 ERR("Kernel metadata flush failed");
1557 /* Flush all buffers before stopping */
1558 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1559 ret
= kernel_flush_buffer(kchan
);
1561 ERR("Kernel flush buffer error");
1565 ret
= kernel_stop_session(ksession
);
1567 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1571 kernel_wait_quiescent(kernel_tracer_fd
);
1573 ksession
->started
= 0;
1577 usess
->start_trace
= 0;
1579 ret
= ust_app_stop_trace_all(usess
);
1581 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1586 session
->started
= 0;
1595 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1597 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1598 size_t nb_uri
, struct lttng_uri
*uris
)
1601 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1602 struct ltt_ust_session
*usess
= session
->ust_session
;
1603 struct consumer_output
*consumer
= NULL
;
1609 /* Can't enable consumer after session started. */
1610 if (session
->enabled
) {
1611 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1616 * This case switch makes sure the domain session has a temporary consumer
1617 * so the URL can be set.
1621 /* Code flow error. A session MUST always have a consumer object */
1622 assert(session
->consumer
);
1624 * The URL will be added to the tracing session consumer instead of a
1625 * specific domain consumer.
1627 consumer
= session
->consumer
;
1629 case LTTNG_DOMAIN_KERNEL
:
1630 /* Code flow error if we don't have a kernel session here. */
1633 /* Create consumer output if none exists */
1634 consumer
= ksess
->tmp_consumer
;
1635 if (consumer
== NULL
) {
1636 consumer
= consumer_copy_output(ksess
->consumer
);
1637 if (consumer
== NULL
) {
1638 ret
= LTTNG_ERR_FATAL
;
1641 /* Trash the consumer subdir, we are about to set a new one. */
1642 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1643 ksess
->tmp_consumer
= consumer
;
1647 case LTTNG_DOMAIN_UST
:
1648 /* Code flow error if we don't have a kernel session here. */
1651 /* Create consumer output if none exists */
1652 consumer
= usess
->tmp_consumer
;
1653 if (consumer
== NULL
) {
1654 consumer
= consumer_copy_output(usess
->consumer
);
1655 if (consumer
== NULL
) {
1656 ret
= LTTNG_ERR_FATAL
;
1659 /* Trash the consumer subdir, we are about to set a new one. */
1660 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1661 usess
->tmp_consumer
= consumer
;
1667 for (i
= 0; i
< nb_uri
; i
++) {
1668 struct consumer_socket
*socket
;
1669 struct lttng_ht_iter iter
;
1671 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1677 * Don't send relayd socket if URI is NOT remote or if the relayd
1678 * socket for the session was already sent.
1680 if (uris
[i
].dtype
== LTTNG_DST_PATH
||
1681 (uris
[i
].stype
== LTTNG_STREAM_CONTROL
&&
1682 consumer
->dst
.net
.control_sock_sent
) ||
1683 (uris
[i
].stype
== LTTNG_STREAM_DATA
&&
1684 consumer
->dst
.net
.data_sock_sent
)) {
1688 /* Try to send relayd URI to the consumer if exist. */
1690 cds_lfht_for_each_entry(consumer
->socks
->ht
, &iter
.iter
,
1691 socket
, node
.node
) {
1693 /* A socket in the HT should never have a negative fd */
1694 assert(socket
->fd
>= 0);
1696 pthread_mutex_lock(socket
->lock
);
1697 ret
= send_consumer_relayd_socket(domain
, session
, &uris
[i
],
1698 consumer
, socket
->fd
);
1699 pthread_mutex_unlock(socket
->lock
);
1700 if (ret
!= LTTNG_OK
) {
1716 * Command LTTNG_CREATE_SESSION processed by the client thread.
1718 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1719 size_t nb_uri
, lttng_sock_cred
*creds
)
1723 struct ltt_session
*session
;
1728 * Verify if the session already exist
1730 * XXX: There is no need for the session lock list here since the caller
1731 * (process_client_msg) is holding it. We might want to change that so a
1732 * single command does not lock the entire session list.
1734 session
= session_find_by_name(name
);
1735 if (session
!= NULL
) {
1736 ret
= LTTNG_ERR_EXIST_SESS
;
1740 /* Create tracing session in the registry */
1741 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
1742 LTTNG_SOCK_GET_GID_CRED(creds
));
1743 if (ret
!= LTTNG_OK
) {
1748 * Get the newly created session pointer back
1750 * XXX: There is no need for the session lock list here since the caller
1751 * (process_client_msg) is holding it. We might want to change that so a
1752 * single command does not lock the entire session list.
1754 session
= session_find_by_name(name
);
1757 /* Create default consumer output for the session not yet created. */
1758 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1759 if (session
->consumer
== NULL
) {
1760 ret
= LTTNG_ERR_FATAL
;
1761 goto consumer_error
;
1765 * This means that the lttng_create_session call was called with the _path_
1766 * argument set to NULL.
1770 * At this point, we'll skip the consumer URI setup and create a
1771 * session with a NULL path which will flag the session to NOT spawn a
1774 DBG("Create session %s with NO uri, skipping consumer setup", name
);
1778 session
->start_consumer
= 1;
1780 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1781 if (ret
!= LTTNG_OK
) {
1782 goto consumer_error
;
1785 session
->consumer
->enabled
= 1;
1791 session_destroy(session
);
1798 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1800 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1803 struct ltt_ust_session
*usess
;
1804 struct ltt_kernel_session
*ksess
;
1809 usess
= session
->ust_session
;
1810 ksess
= session
->kernel_session
;
1812 /* Clean kernel session teardown */
1813 kernel_destroy_session(ksess
);
1815 /* UST session teardown */
1817 /* Close any relayd session */
1818 consumer_output_send_destroy_relayd(usess
->consumer
);
1820 /* Destroy every UST application related to this session. */
1821 ret
= ust_app_destroy_trace_all(usess
);
1823 ERR("Error in ust_app_destroy_trace_all");
1826 /* Clean up the rest. */
1827 trace_ust_destroy_session(usess
);
1831 * Must notify the kernel thread here to update it's poll set in order to
1832 * remove the channel(s)' fd just destroyed.
1834 ret
= notify_thread_pipe(wpipe
);
1836 PERROR("write kernel poll pipe");
1839 ret
= session_destroy(session
);
1845 * Command LTTNG_CALIBRATE processed by the client thread.
1847 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1852 case LTTNG_DOMAIN_KERNEL
:
1854 struct lttng_kernel_calibrate kcalibrate
;
1856 kcalibrate
.type
= calibrate
->type
;
1857 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1859 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1864 case LTTNG_DOMAIN_UST
:
1866 struct lttng_ust_calibrate ucalibrate
;
1868 ucalibrate
.type
= calibrate
->type
;
1869 ret
= ust_app_calibrate_glb(&ucalibrate
);
1871 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1877 ret
= LTTNG_ERR_UND
;
1888 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1890 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1891 const char *sock_path
, struct consumer_data
*cdata
)
1894 struct consumer_socket
*socket
;
1901 case LTTNG_DOMAIN_KERNEL
:
1903 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1907 /* Can't register a consumer if there is already one */
1908 if (ksess
->consumer_fds_sent
!= 0) {
1909 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1913 sock
= lttcomm_connect_unix_sock(sock_path
);
1915 ret
= LTTNG_ERR_CONNECT_FAIL
;
1919 socket
= consumer_allocate_socket(sock
);
1920 if (socket
== NULL
) {
1921 ret
= LTTNG_ERR_FATAL
;
1926 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1927 if (socket
->lock
== NULL
) {
1928 PERROR("zmalloc pthread mutex");
1929 ret
= LTTNG_ERR_FATAL
;
1932 pthread_mutex_init(socket
->lock
, NULL
);
1933 socket
->registered
= 1;
1936 consumer_add_socket(socket
, ksess
->consumer
);
1939 pthread_mutex_lock(&cdata
->pid_mutex
);
1941 pthread_mutex_unlock(&cdata
->pid_mutex
);
1946 /* TODO: Userspace tracing */
1947 ret
= LTTNG_ERR_UND
;
1958 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1960 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1961 struct lttng_domain
**domains
)
1966 if (session
->kernel_session
!= NULL
) {
1967 DBG3("Listing domains found kernel domain");
1971 if (session
->ust_session
!= NULL
) {
1972 DBG3("Listing domains found UST global domain");
1976 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1977 if (*domains
== NULL
) {
1978 ret
= LTTNG_ERR_FATAL
;
1982 if (session
->kernel_session
!= NULL
) {
1983 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1987 if (session
->ust_session
!= NULL
) {
1988 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1995 /* Return negative value to differentiate return code */
2001 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2003 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
2004 struct lttng_channel
**channels
)
2007 ssize_t nb_chan
= 0;
2010 case LTTNG_DOMAIN_KERNEL
:
2011 if (session
->kernel_session
!= NULL
) {
2012 nb_chan
= session
->kernel_session
->channel_count
;
2014 DBG3("Number of kernel channels %zd", nb_chan
);
2016 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2019 case LTTNG_DOMAIN_UST
:
2020 if (session
->ust_session
!= NULL
) {
2021 nb_chan
= lttng_ht_get_count(
2022 session
->ust_session
->domain_global
.channels
);
2024 DBG3("Number of UST global channels %zd", nb_chan
);
2026 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2031 ret
= LTTNG_ERR_UND
;
2036 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2037 if (*channels
== NULL
) {
2038 ret
= LTTNG_ERR_FATAL
;
2042 list_lttng_channels(domain
, session
, *channels
);
2045 /* Ret value was set in the domain switch case */
2052 /* Return negative value to differentiate return code */
2057 * Command LTTNG_LIST_EVENTS processed by the client thread.
2059 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2060 char *channel_name
, struct lttng_event
**events
)
2063 ssize_t nb_event
= 0;
2066 case LTTNG_DOMAIN_KERNEL
:
2067 if (session
->kernel_session
!= NULL
) {
2068 nb_event
= list_lttng_kernel_events(channel_name
,
2069 session
->kernel_session
, events
);
2072 case LTTNG_DOMAIN_UST
:
2074 if (session
->ust_session
!= NULL
) {
2075 nb_event
= list_lttng_ust_global_events(channel_name
,
2076 &session
->ust_session
->domain_global
, events
);
2081 ret
= LTTNG_ERR_UND
;
2088 /* Return negative value to differentiate return code */
2093 * Using the session list, filled a lttng_session array to send back to the
2094 * client for session listing.
2096 * The session list lock MUST be acquired before calling this function. Use
2097 * session_lock_list() and session_unlock_list().
2099 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2104 struct ltt_session
*session
;
2105 struct ltt_session_list
*list
= session_get_list();
2107 DBG("Getting all available session for UID %d GID %d",
2110 * Iterate over session list and append data after the control struct in
2113 cds_list_for_each_entry(session
, &list
->head
, list
) {
2115 * Only list the sessions the user can control.
2117 if (!session_access_ok(session
, uid
, gid
)) {
2121 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2122 struct ltt_ust_session
*usess
= session
->ust_session
;
2124 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2125 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2126 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2127 ret
= build_network_session_path(sessions
[i
].path
,
2128 sizeof(session
[i
].path
), session
);
2130 ret
= snprintf(sessions
[i
].path
, sizeof(session
[i
].path
), "%s",
2131 session
->consumer
->dst
.trace_path
);
2134 PERROR("snprintf session path");
2138 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2139 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2140 sessions
[i
].enabled
= session
->enabled
;
2146 * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
2148 int cmd_disable_consumer(int domain
, struct ltt_session
*session
)
2151 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2152 struct ltt_ust_session
*usess
= session
->ust_session
;
2153 struct consumer_output
*consumer
;
2157 if (session
->enabled
) {
2158 /* Can't disable consumer on an already started session */
2159 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2163 if (!session
->start_consumer
) {
2164 ret
= LTTNG_ERR_NO_CONSUMER
;
2170 DBG("Disable tracing session %s consumer", session
->name
);
2171 consumer
= session
->consumer
;
2173 case LTTNG_DOMAIN_KERNEL
:
2174 /* Code flow error if we don't have a kernel session here. */
2177 DBG("Disabling kernel consumer");
2178 consumer
= ksess
->consumer
;
2181 case LTTNG_DOMAIN_UST
:
2182 /* Code flow error if we don't have a UST session here. */
2185 DBG("Disabling UST consumer");
2186 consumer
= usess
->consumer
;
2190 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2195 consumer
->enabled
= 0;
2196 /* Success at this point */
2199 ret
= LTTNG_ERR_NO_CONSUMER
;
2207 * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
2209 int cmd_enable_consumer(int domain
, struct ltt_session
*session
)
2212 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2213 struct ltt_ust_session
*usess
= session
->ust_session
;
2214 struct consumer_output
*consumer
= NULL
;
2218 /* Can't enable consumer after session started. */
2219 if (session
->enabled
) {
2220 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2226 assert(session
->consumer
);
2227 consumer
= session
->consumer
;
2229 case LTTNG_DOMAIN_KERNEL
:
2230 /* Code flow error if we don't have a kernel session here. */
2234 * Check if we have already sent fds to the consumer. In that case,
2235 * the enable-consumer command can't be used because a start trace
2236 * had previously occured.
2238 if (ksess
->consumer_fds_sent
) {
2239 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2243 consumer
= ksess
->tmp_consumer
;
2244 if (consumer
== NULL
) {
2246 /* No temp. consumer output exists. Using the current one. */
2247 DBG3("No temporary consumer. Using default");
2248 consumer
= ksess
->consumer
;
2252 switch (consumer
->type
) {
2253 case CONSUMER_DST_LOCAL
:
2254 DBG2("Consumer output is local. Creating directory(ies)");
2256 /* Create directory(ies) */
2257 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2258 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2260 if (ret
!= -EEXIST
) {
2261 ERR("Trace directory creation error");
2262 ret
= LTTNG_ERR_FATAL
;
2267 case CONSUMER_DST_NET
:
2268 DBG2("Consumer output is network. Validating URIs");
2269 /* Validate if we have both control and data path set. */
2270 if (!consumer
->dst
.net
.control_isset
) {
2271 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2275 if (!consumer
->dst
.net
.data_isset
) {
2276 ret
= LTTNG_ERR_URL_DATA_MISS
;
2280 /* Check established network session state */
2281 if (session
->net_handle
== 0) {
2282 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2283 ERR("Session network handle is not set on enable-consumer");
2292 * This is race free for now since the session lock is acquired before
2293 * ending up in this function. No other threads can access this kernel
2294 * session without this lock hence freeing the consumer output object
2298 /* Destroy current consumer. We are about to replace it */
2299 consumer_destroy_output(ksess
->consumer
);
2301 ksess
->consumer
= consumer
;
2302 ksess
->tmp_consumer
= NULL
;
2305 case LTTNG_DOMAIN_UST
:
2306 /* Code flow error if we don't have a UST session here. */
2310 * Check if we have already sent fds to the consumer. In that case,
2311 * the enable-consumer command can't be used because a start trace
2312 * had previously occured.
2314 if (usess
->start_trace
) {
2315 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2319 consumer
= usess
->tmp_consumer
;
2320 if (consumer
== NULL
) {
2322 /* No temp. consumer output exists. Using the current one. */
2323 DBG3("No temporary consumer. Using default");
2324 consumer
= usess
->consumer
;
2328 switch (consumer
->type
) {
2329 case CONSUMER_DST_LOCAL
:
2330 DBG2("Consumer output is local. Creating directory(ies)");
2332 /* Create directory(ies) */
2333 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2334 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2336 if (ret
!= -EEXIST
) {
2337 ERR("Trace directory creation error");
2338 ret
= LTTNG_ERR_FATAL
;
2343 case CONSUMER_DST_NET
:
2344 DBG2("Consumer output is network. Validating URIs");
2345 /* Validate if we have both control and data path set. */
2346 if (!consumer
->dst
.net
.control_isset
) {
2347 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2351 if (!consumer
->dst
.net
.data_isset
) {
2352 ret
= LTTNG_ERR_URL_DATA_MISS
;
2356 /* Check established network session state */
2357 if (session
->net_handle
== 0) {
2358 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2359 DBG2("Session network handle is not set on enable-consumer");
2363 if (consumer
->net_seq_index
== -1) {
2364 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2365 DBG2("Network index is not set on the consumer");
2374 * This is race free for now since the session lock is acquired before
2375 * ending up in this function. No other threads can access this kernel
2376 * session without this lock hence freeing the consumer output object
2380 /* Destroy current consumer. We are about to replace it */
2381 consumer_destroy_output(usess
->consumer
);
2383 usess
->consumer
= consumer
;
2384 usess
->tmp_consumer
= NULL
;
2389 session
->start_consumer
= 1;
2393 consumer
->enabled
= 1;
2394 /* Success at this point */
2397 /* Should not really happend... */
2398 ret
= LTTNG_ERR_NO_CONSUMER
;
2406 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2407 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2409 int cmd_data_pending(struct ltt_session
*session
)
2412 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2413 struct ltt_ust_session
*usess
= session
->ust_session
;
2417 /* Session MUST be stopped to ask for data availability. */
2418 if (session
->enabled
) {
2419 ret
= LTTNG_ERR_SESSION_STARTED
;
2423 if (ksess
&& ksess
->consumer
) {
2424 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2426 /* Data is still being extracted for the kernel. */
2431 if (usess
&& usess
->consumer
) {
2432 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2434 /* Data is still being extracted for the kernel. */
2439 /* Data is ready to be read by a viewer */
2447 * Init command subsystem.
2452 * Set network sequence index to 1 for streams to match a relayd socket on
2453 * the consumer side.
2455 uatomic_set(&relayd_net_seq_idx
, 1);
2457 DBG("Command subsystem initialized");