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
, 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
,
531 struct consumer_socket
*consumer_sock
)
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_sock
, sock
,
561 consumer
, relayd_uri
->stype
, session
->id
);
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
,
597 struct consumer_socket
*sock
)
604 /* Sending control relayd socket. */
605 if (!consumer
->dst
.net
.control_sock_sent
) {
606 ret
= send_consumer_relayd_socket(domain
, session
,
607 &consumer
->dst
.net
.control
, consumer
, sock
);
608 if (ret
!= LTTNG_OK
) {
613 /* Sending data relayd socket. */
614 if (!consumer
->dst
.net
.data_sock_sent
) {
615 ret
= send_consumer_relayd_socket(domain
, session
,
616 &consumer
->dst
.net
.data
, consumer
, sock
);
617 if (ret
!= LTTNG_OK
) {
627 * Setup relayd connections for a tracing session. First creates the socket to
628 * the relayd and send them to the right domain consumer. Consumer type MUST be
631 static int setup_relayd(struct ltt_session
*session
)
634 struct ltt_ust_session
*usess
;
635 struct ltt_kernel_session
*ksess
;
636 struct consumer_socket
*socket
;
637 struct lttng_ht_iter iter
;
641 usess
= session
->ust_session
;
642 ksess
= session
->kernel_session
;
644 DBG2("Setting relayd for session %s", session
->name
);
646 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
647 && usess
->consumer
->enabled
) {
648 /* For each consumer socket, send relayd sockets */
649 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
651 /* Code flow error */
652 assert(socket
->fd
>= 0);
654 pthread_mutex_lock(socket
->lock
);
655 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
,
656 usess
->consumer
, socket
);
657 pthread_mutex_unlock(socket
->lock
);
658 if (ret
!= LTTNG_OK
) {
664 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
665 && ksess
->consumer
->enabled
) {
666 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
668 /* Code flow error */
669 assert(socket
->fd
>= 0);
671 pthread_mutex_lock(socket
->lock
);
672 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
,
673 ksess
->consumer
, socket
);
674 pthread_mutex_unlock(socket
->lock
);
675 if (ret
!= LTTNG_OK
) {
686 * Start a kernel session by opening all necessary streams.
688 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
691 struct ltt_kernel_channel
*kchan
;
693 /* Open kernel metadata */
694 if (ksess
->metadata
== NULL
) {
695 ret
= kernel_open_metadata(ksess
);
697 ret
= LTTNG_ERR_KERN_META_FAIL
;
702 /* Open kernel metadata stream */
703 if (ksess
->metadata_stream_fd
< 0) {
704 ret
= kernel_open_metadata_stream(ksess
);
706 ERR("Kernel create metadata stream failed");
707 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
712 /* For each channel */
713 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
714 if (kchan
->stream_count
== 0) {
715 ret
= kernel_open_channel_stream(kchan
);
717 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
720 /* Update the stream global counter */
721 ksess
->stream_count_global
+= ret
;
725 /* Setup kernel consumer socket and send fds to it */
726 ret
= init_kernel_tracing(ksess
);
728 ret
= LTTNG_ERR_KERN_START_FAIL
;
732 /* This start the kernel tracing */
733 ret
= kernel_start_session(ksess
);
735 ret
= LTTNG_ERR_KERN_START_FAIL
;
739 /* Quiescent wait after starting trace */
740 kernel_wait_quiescent(kernel_tracer_fd
);
751 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
753 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
757 struct ltt_ust_session
*usess
;
759 usess
= session
->ust_session
;
762 case LTTNG_DOMAIN_KERNEL
:
764 ret
= channel_kernel_disable(session
->kernel_session
,
766 if (ret
!= LTTNG_OK
) {
770 kernel_wait_quiescent(kernel_tracer_fd
);
773 case LTTNG_DOMAIN_UST
:
775 struct ltt_ust_channel
*uchan
;
776 struct lttng_ht
*chan_ht
;
778 chan_ht
= usess
->domain_global
.channels
;
780 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
782 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
786 ret
= channel_ust_disable(usess
, domain
, uchan
);
787 if (ret
!= LTTNG_OK
) {
793 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
794 case LTTNG_DOMAIN_UST_EXEC_NAME
:
795 case LTTNG_DOMAIN_UST_PID
:
798 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
809 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
811 * The wpipe arguments is used as a notifier for the kernel thread.
813 int cmd_enable_channel(struct ltt_session
*session
,
814 int domain
, struct lttng_channel
*attr
, int wpipe
)
817 struct ltt_ust_session
*usess
= session
->ust_session
;
818 struct lttng_ht
*chan_ht
;
823 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
826 case LTTNG_DOMAIN_KERNEL
:
828 struct ltt_kernel_channel
*kchan
;
830 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
831 session
->kernel_session
);
833 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
835 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
838 if (ret
!= LTTNG_OK
) {
842 kernel_wait_quiescent(kernel_tracer_fd
);
845 * If the session was previously started, start as well this newly
846 * created kernel session so the events/channels enabled *after* the
847 * start actually work.
849 if (session
->started
&& !session
->kernel_session
->started
) {
850 ret
= start_kernel_session(session
->kernel_session
, wpipe
);
851 if (ret
!= LTTNG_OK
) {
857 case LTTNG_DOMAIN_UST
:
859 struct ltt_ust_channel
*uchan
;
861 chan_ht
= usess
->domain_global
.channels
;
863 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
865 ret
= channel_ust_create(usess
, domain
, attr
);
867 ret
= channel_ust_enable(usess
, domain
, uchan
);
870 /* Start the UST session if the session was already started. */
871 if (session
->started
&& !usess
->start_trace
) {
872 ret
= ust_app_start_trace_all(usess
);
874 ret
= LTTNG_ERR_UST_START_FAIL
;
878 usess
->start_trace
= 1;
883 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
884 case LTTNG_DOMAIN_UST_EXEC_NAME
:
885 case LTTNG_DOMAIN_UST_PID
:
888 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
898 * Command LTTNG_DISABLE_EVENT processed by the client thread.
900 int cmd_disable_event(struct ltt_session
*session
, int domain
,
901 char *channel_name
, char *event_name
)
906 case LTTNG_DOMAIN_KERNEL
:
908 struct ltt_kernel_channel
*kchan
;
909 struct ltt_kernel_session
*ksess
;
911 ksess
= session
->kernel_session
;
913 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
915 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
919 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
920 if (ret
!= LTTNG_OK
) {
924 kernel_wait_quiescent(kernel_tracer_fd
);
927 case LTTNG_DOMAIN_UST
:
929 struct ltt_ust_channel
*uchan
;
930 struct ltt_ust_session
*usess
;
932 usess
= session
->ust_session
;
934 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
937 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
941 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
942 if (ret
!= LTTNG_OK
) {
946 DBG3("Disable UST event %s in channel %s completed", event_name
,
951 case LTTNG_DOMAIN_UST_EXEC_NAME
:
952 case LTTNG_DOMAIN_UST_PID
:
953 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
967 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
969 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
975 case LTTNG_DOMAIN_KERNEL
:
977 struct ltt_kernel_session
*ksess
;
978 struct ltt_kernel_channel
*kchan
;
980 ksess
= session
->kernel_session
;
982 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
984 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
988 ret
= event_kernel_disable_all(ksess
, kchan
);
989 if (ret
!= LTTNG_OK
) {
993 kernel_wait_quiescent(kernel_tracer_fd
);
996 case LTTNG_DOMAIN_UST
:
998 struct ltt_ust_session
*usess
;
999 struct ltt_ust_channel
*uchan
;
1001 usess
= session
->ust_session
;
1003 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1005 if (uchan
== NULL
) {
1006 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1010 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
1015 DBG3("Disable all UST events in channel %s completed", channel_name
);
1020 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1021 case LTTNG_DOMAIN_UST_PID
:
1022 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1025 ret
= LTTNG_ERR_UND
;
1036 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1038 int cmd_add_context(struct ltt_session
*session
, int domain
,
1039 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1044 case LTTNG_DOMAIN_KERNEL
:
1045 assert(session
->kernel_session
);
1047 if (session
->kernel_session
->channel_count
== 0) {
1048 /* Create default channel */
1049 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1050 if (ret
!= LTTNG_OK
) {
1055 /* Add kernel context to kernel tracer */
1056 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1057 if (ret
!= LTTNG_OK
) {
1061 case LTTNG_DOMAIN_UST
:
1063 struct ltt_ust_session
*usess
= session
->ust_session
;
1066 unsigned int chan_count
=
1067 lttng_ht_get_count(usess
->domain_global
.channels
);
1068 if (chan_count
== 0) {
1069 struct lttng_channel
*attr
;
1070 /* Create default channel */
1071 attr
= channel_new_default_attr(domain
);
1073 ret
= LTTNG_ERR_FATAL
;
1077 ret
= channel_ust_create(usess
, domain
, attr
);
1078 if (ret
!= LTTNG_OK
) {
1085 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1086 if (ret
!= LTTNG_OK
) {
1092 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1093 case LTTNG_DOMAIN_UST_PID
:
1094 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1097 ret
= LTTNG_ERR_UND
;
1108 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1110 int cmd_enable_event(struct ltt_session
*session
, int domain
,
1111 char *channel_name
, struct lttng_event
*event
,
1112 struct lttng_filter_bytecode
*filter
, int wpipe
)
1114 int ret
, channel_created
= 0;
1115 struct lttng_channel
*attr
;
1119 assert(channel_name
);
1122 case LTTNG_DOMAIN_KERNEL
:
1124 struct ltt_kernel_channel
*kchan
;
1126 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1127 session
->kernel_session
);
1128 if (kchan
== NULL
) {
1129 attr
= channel_new_default_attr(domain
);
1131 ret
= LTTNG_ERR_FATAL
;
1134 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1136 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1137 if (ret
!= LTTNG_OK
) {
1143 channel_created
= 1;
1146 /* Get the newly created kernel channel pointer */
1147 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1148 session
->kernel_session
);
1149 if (kchan
== NULL
) {
1150 /* This sould not happen... */
1151 ret
= LTTNG_ERR_FATAL
;
1155 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
1157 if (ret
!= LTTNG_OK
) {
1158 if (channel_created
) {
1159 /* Let's not leak a useless channel. */
1160 kernel_destroy_channel(kchan
);
1165 kernel_wait_quiescent(kernel_tracer_fd
);
1168 case LTTNG_DOMAIN_UST
:
1170 struct ltt_ust_channel
*uchan
;
1171 struct ltt_ust_session
*usess
= session
->ust_session
;
1175 /* Get channel from global UST domain */
1176 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1178 if (uchan
== NULL
) {
1179 /* Create default channel */
1180 attr
= channel_new_default_attr(domain
);
1182 ret
= LTTNG_ERR_FATAL
;
1185 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1187 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1188 if (ret
!= LTTNG_OK
) {
1194 /* Get the newly created channel reference back */
1195 uchan
= trace_ust_find_channel_by_name(
1196 usess
->domain_global
.channels
, channel_name
);
1200 /* At this point, the session and channel exist on the tracer */
1201 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
, filter
);
1202 if (ret
!= LTTNG_OK
) {
1208 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1209 case LTTNG_DOMAIN_UST_PID
:
1210 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1213 ret
= LTTNG_ERR_UND
;
1224 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1226 int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
1227 char *channel_name
, int event_type
,
1228 struct lttng_filter_bytecode
*filter
, int wpipe
)
1231 struct lttng_channel
*attr
;
1234 assert(channel_name
);
1237 case LTTNG_DOMAIN_KERNEL
:
1239 struct ltt_kernel_channel
*kchan
;
1241 assert(session
->kernel_session
);
1243 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1244 session
->kernel_session
);
1245 if (kchan
== NULL
) {
1246 /* Create default channel */
1247 attr
= channel_new_default_attr(domain
);
1249 ret
= LTTNG_ERR_FATAL
;
1252 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1254 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1255 if (ret
!= LTTNG_OK
) {
1261 /* Get the newly created kernel channel pointer */
1262 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1263 session
->kernel_session
);
1267 switch (event_type
) {
1268 case LTTNG_EVENT_SYSCALL
:
1269 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
1270 kchan
, kernel_tracer_fd
);
1272 case LTTNG_EVENT_TRACEPOINT
:
1274 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1275 * events already registered to the channel.
1277 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
1278 kchan
, kernel_tracer_fd
);
1280 case LTTNG_EVENT_ALL
:
1281 /* Enable syscalls and tracepoints */
1282 ret
= event_kernel_enable_all(session
->kernel_session
,
1283 kchan
, kernel_tracer_fd
);
1286 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1290 /* Manage return value */
1291 if (ret
!= LTTNG_OK
) {
1293 * On error, cmd_enable_channel call will take care of destroying
1294 * the created channel if it was needed.
1299 kernel_wait_quiescent(kernel_tracer_fd
);
1302 case LTTNG_DOMAIN_UST
:
1304 struct ltt_ust_channel
*uchan
;
1305 struct ltt_ust_session
*usess
= session
->ust_session
;
1309 /* Get channel from global UST domain */
1310 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1312 if (uchan
== NULL
) {
1313 /* Create default channel */
1314 attr
= channel_new_default_attr(domain
);
1316 ret
= LTTNG_ERR_FATAL
;
1319 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1321 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1322 if (ret
!= LTTNG_OK
) {
1328 /* Get the newly created channel reference back */
1329 uchan
= trace_ust_find_channel_by_name(
1330 usess
->domain_global
.channels
, channel_name
);
1334 /* At this point, the session and channel exist on the tracer */
1336 switch (event_type
) {
1337 case LTTNG_EVENT_ALL
:
1338 case LTTNG_EVENT_TRACEPOINT
:
1339 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
,
1341 if (ret
!= LTTNG_OK
) {
1346 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1350 /* Manage return value */
1351 if (ret
!= LTTNG_OK
) {
1358 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1359 case LTTNG_DOMAIN_UST_PID
:
1360 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1363 ret
= LTTNG_ERR_UND
;
1375 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1377 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1380 ssize_t nb_events
= 0;
1383 case LTTNG_DOMAIN_KERNEL
:
1384 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1385 if (nb_events
< 0) {
1386 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1390 case LTTNG_DOMAIN_UST
:
1391 nb_events
= ust_app_list_events(events
);
1392 if (nb_events
< 0) {
1393 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1398 ret
= LTTNG_ERR_UND
;
1405 /* Return negative value to differentiate return code */
1410 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1412 ssize_t
cmd_list_tracepoint_fields(int domain
,
1413 struct lttng_event_field
**fields
)
1416 ssize_t nb_fields
= 0;
1419 case LTTNG_DOMAIN_UST
:
1420 nb_fields
= ust_app_list_event_fields(fields
);
1421 if (nb_fields
< 0) {
1422 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1426 case LTTNG_DOMAIN_KERNEL
:
1427 default: /* fall-through */
1428 ret
= LTTNG_ERR_UND
;
1435 /* Return negative value to differentiate return code */
1440 * Command LTTNG_START_TRACE processed by the client thread.
1442 int cmd_start_trace(struct ltt_session
*session
)
1445 struct ltt_kernel_session
*ksession
;
1446 struct ltt_ust_session
*usess
;
1450 /* Ease our life a bit ;) */
1451 ksession
= session
->kernel_session
;
1452 usess
= session
->ust_session
;
1454 if (session
->enabled
) {
1455 /* Already started. */
1456 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1460 session
->enabled
= 1;
1462 ret
= setup_relayd(session
);
1463 if (ret
!= LTTNG_OK
) {
1464 ERR("Error setting up relayd for session %s", session
->name
);
1468 /* Kernel tracing */
1469 if (ksession
!= NULL
) {
1470 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1471 if (ret
!= LTTNG_OK
) {
1476 /* Flag session that trace should start automatically */
1478 usess
->start_trace
= 1;
1480 ret
= ust_app_start_trace_all(usess
);
1482 ret
= LTTNG_ERR_UST_START_FAIL
;
1487 session
->started
= 1;
1496 * Command LTTNG_STOP_TRACE processed by the client thread.
1498 int cmd_stop_trace(struct ltt_session
*session
)
1501 struct ltt_kernel_channel
*kchan
;
1502 struct ltt_kernel_session
*ksession
;
1503 struct ltt_ust_session
*usess
;
1508 ksession
= session
->kernel_session
;
1509 usess
= session
->ust_session
;
1511 if (!session
->enabled
) {
1512 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1516 session
->enabled
= 0;
1520 DBG("Stop kernel tracing");
1522 /* Flush metadata if exist */
1523 if (ksession
->metadata_stream_fd
>= 0) {
1524 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1526 ERR("Kernel metadata flush failed");
1530 /* Flush all buffers before stopping */
1531 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1532 ret
= kernel_flush_buffer(kchan
);
1534 ERR("Kernel flush buffer error");
1538 ret
= kernel_stop_session(ksession
);
1540 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1544 kernel_wait_quiescent(kernel_tracer_fd
);
1546 ksession
->started
= 0;
1550 usess
->start_trace
= 0;
1552 ret
= ust_app_stop_trace_all(usess
);
1554 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1559 session
->started
= 0;
1568 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1570 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1571 size_t nb_uri
, struct lttng_uri
*uris
)
1574 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1575 struct ltt_ust_session
*usess
= session
->ust_session
;
1576 struct consumer_output
*consumer
= NULL
;
1582 /* Can't enable consumer after session started. */
1583 if (session
->enabled
) {
1584 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1589 * This case switch makes sure the domain session has a temporary consumer
1590 * so the URL can be set.
1594 /* Code flow error. A session MUST always have a consumer object */
1595 assert(session
->consumer
);
1597 * The URL will be added to the tracing session consumer instead of a
1598 * specific domain consumer.
1600 consumer
= session
->consumer
;
1602 case LTTNG_DOMAIN_KERNEL
:
1603 /* Code flow error if we don't have a kernel session here. */
1606 /* Create consumer output if none exists */
1607 consumer
= ksess
->tmp_consumer
;
1608 if (consumer
== NULL
) {
1609 consumer
= consumer_copy_output(ksess
->consumer
);
1610 if (consumer
== NULL
) {
1611 ret
= LTTNG_ERR_FATAL
;
1614 /* Trash the consumer subdir, we are about to set a new one. */
1615 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1616 ksess
->tmp_consumer
= consumer
;
1620 case LTTNG_DOMAIN_UST
:
1621 /* Code flow error if we don't have a kernel session here. */
1624 /* Create consumer output if none exists */
1625 consumer
= usess
->tmp_consumer
;
1626 if (consumer
== NULL
) {
1627 consumer
= consumer_copy_output(usess
->consumer
);
1628 if (consumer
== NULL
) {
1629 ret
= LTTNG_ERR_FATAL
;
1632 /* Trash the consumer subdir, we are about to set a new one. */
1633 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1634 usess
->tmp_consumer
= consumer
;
1640 for (i
= 0; i
< nb_uri
; i
++) {
1641 struct consumer_socket
*socket
;
1642 struct lttng_ht_iter iter
;
1644 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1650 * Don't send relayd socket if URI is NOT remote or if the relayd
1651 * socket for the session was already sent.
1653 if (uris
[i
].dtype
== LTTNG_DST_PATH
||
1654 (uris
[i
].stype
== LTTNG_STREAM_CONTROL
&&
1655 consumer
->dst
.net
.control_sock_sent
) ||
1656 (uris
[i
].stype
== LTTNG_STREAM_DATA
&&
1657 consumer
->dst
.net
.data_sock_sent
)) {
1661 /* Try to send relayd URI to the consumer if exist. */
1663 cds_lfht_for_each_entry(consumer
->socks
->ht
, &iter
.iter
,
1664 socket
, node
.node
) {
1666 /* A socket in the HT should never have a negative fd */
1667 assert(socket
->fd
>= 0);
1669 pthread_mutex_lock(socket
->lock
);
1670 ret
= send_consumer_relayd_socket(domain
, session
, &uris
[i
],
1672 pthread_mutex_unlock(socket
->lock
);
1673 if (ret
!= LTTNG_OK
) {
1689 * Command LTTNG_CREATE_SESSION processed by the client thread.
1691 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1692 size_t nb_uri
, lttng_sock_cred
*creds
)
1696 struct ltt_session
*session
;
1701 * Verify if the session already exist
1703 * XXX: There is no need for the session lock list here since the caller
1704 * (process_client_msg) is holding it. We might want to change that so a
1705 * single command does not lock the entire session list.
1707 session
= session_find_by_name(name
);
1708 if (session
!= NULL
) {
1709 ret
= LTTNG_ERR_EXIST_SESS
;
1713 /* Create tracing session in the registry */
1714 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
1715 LTTNG_SOCK_GET_GID_CRED(creds
));
1716 if (ret
!= LTTNG_OK
) {
1721 * Get the newly created session pointer back
1723 * XXX: There is no need for the session lock list here since the caller
1724 * (process_client_msg) is holding it. We might want to change that so a
1725 * single command does not lock the entire session list.
1727 session
= session_find_by_name(name
);
1730 /* Create default consumer output for the session not yet created. */
1731 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1732 if (session
->consumer
== NULL
) {
1733 ret
= LTTNG_ERR_FATAL
;
1734 goto consumer_error
;
1738 * This means that the lttng_create_session call was called with the _path_
1739 * argument set to NULL.
1743 * At this point, we'll skip the consumer URI setup and create a
1744 * session with a NULL path which will flag the session to NOT spawn a
1747 DBG("Create session %s with NO uri, skipping consumer setup", name
);
1751 session
->start_consumer
= 1;
1753 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1754 if (ret
!= LTTNG_OK
) {
1755 goto consumer_error
;
1758 session
->consumer
->enabled
= 1;
1764 session_destroy(session
);
1771 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1773 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1776 struct ltt_ust_session
*usess
;
1777 struct ltt_kernel_session
*ksess
;
1782 usess
= session
->ust_session
;
1783 ksess
= session
->kernel_session
;
1785 /* Clean kernel session teardown */
1786 kernel_destroy_session(ksess
);
1788 /* UST session teardown */
1790 /* Close any relayd session */
1791 consumer_output_send_destroy_relayd(usess
->consumer
);
1793 /* Destroy every UST application related to this session. */
1794 ret
= ust_app_destroy_trace_all(usess
);
1796 ERR("Error in ust_app_destroy_trace_all");
1799 /* Clean up the rest. */
1800 trace_ust_destroy_session(usess
);
1804 * Must notify the kernel thread here to update it's poll set in order to
1805 * remove the channel(s)' fd just destroyed.
1807 ret
= notify_thread_pipe(wpipe
);
1809 PERROR("write kernel poll pipe");
1812 ret
= session_destroy(session
);
1818 * Command LTTNG_CALIBRATE processed by the client thread.
1820 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1825 case LTTNG_DOMAIN_KERNEL
:
1827 struct lttng_kernel_calibrate kcalibrate
;
1829 kcalibrate
.type
= calibrate
->type
;
1830 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1832 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1837 case LTTNG_DOMAIN_UST
:
1839 struct lttng_ust_calibrate ucalibrate
;
1841 ucalibrate
.type
= calibrate
->type
;
1842 ret
= ust_app_calibrate_glb(&ucalibrate
);
1844 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1850 ret
= LTTNG_ERR_UND
;
1861 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1863 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1864 const char *sock_path
, struct consumer_data
*cdata
)
1867 struct consumer_socket
*socket
;
1874 case LTTNG_DOMAIN_KERNEL
:
1876 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1880 /* Can't register a consumer if there is already one */
1881 if (ksess
->consumer_fds_sent
!= 0) {
1882 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1886 sock
= lttcomm_connect_unix_sock(sock_path
);
1888 ret
= LTTNG_ERR_CONNECT_FAIL
;
1892 socket
= consumer_allocate_socket(sock
);
1893 if (socket
== NULL
) {
1896 PERROR("close register consumer");
1898 ret
= LTTNG_ERR_FATAL
;
1902 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1903 if (socket
->lock
== NULL
) {
1904 PERROR("zmalloc pthread mutex");
1905 ret
= LTTNG_ERR_FATAL
;
1908 pthread_mutex_init(socket
->lock
, NULL
);
1909 socket
->registered
= 1;
1912 consumer_add_socket(socket
, ksess
->consumer
);
1915 pthread_mutex_lock(&cdata
->pid_mutex
);
1917 pthread_mutex_unlock(&cdata
->pid_mutex
);
1922 /* TODO: Userspace tracing */
1923 ret
= LTTNG_ERR_UND
;
1934 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1936 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1937 struct lttng_domain
**domains
)
1942 if (session
->kernel_session
!= NULL
) {
1943 DBG3("Listing domains found kernel domain");
1947 if (session
->ust_session
!= NULL
) {
1948 DBG3("Listing domains found UST global domain");
1952 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1953 if (*domains
== NULL
) {
1954 ret
= LTTNG_ERR_FATAL
;
1958 if (session
->kernel_session
!= NULL
) {
1959 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1963 if (session
->ust_session
!= NULL
) {
1964 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1971 /* Return negative value to differentiate return code */
1977 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1979 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1980 struct lttng_channel
**channels
)
1983 ssize_t nb_chan
= 0;
1986 case LTTNG_DOMAIN_KERNEL
:
1987 if (session
->kernel_session
!= NULL
) {
1988 nb_chan
= session
->kernel_session
->channel_count
;
1990 DBG3("Number of kernel channels %zd", nb_chan
);
1992 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1995 case LTTNG_DOMAIN_UST
:
1996 if (session
->ust_session
!= NULL
) {
1997 nb_chan
= lttng_ht_get_count(
1998 session
->ust_session
->domain_global
.channels
);
2000 DBG3("Number of UST global channels %zd", nb_chan
);
2002 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2007 ret
= LTTNG_ERR_UND
;
2012 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2013 if (*channels
== NULL
) {
2014 ret
= LTTNG_ERR_FATAL
;
2018 list_lttng_channels(domain
, session
, *channels
);
2021 /* Ret value was set in the domain switch case */
2028 /* Return negative value to differentiate return code */
2033 * Command LTTNG_LIST_EVENTS processed by the client thread.
2035 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2036 char *channel_name
, struct lttng_event
**events
)
2039 ssize_t nb_event
= 0;
2042 case LTTNG_DOMAIN_KERNEL
:
2043 if (session
->kernel_session
!= NULL
) {
2044 nb_event
= list_lttng_kernel_events(channel_name
,
2045 session
->kernel_session
, events
);
2048 case LTTNG_DOMAIN_UST
:
2050 if (session
->ust_session
!= NULL
) {
2051 nb_event
= list_lttng_ust_global_events(channel_name
,
2052 &session
->ust_session
->domain_global
, events
);
2057 ret
= LTTNG_ERR_UND
;
2064 /* Return negative value to differentiate return code */
2069 * Using the session list, filled a lttng_session array to send back to the
2070 * client for session listing.
2072 * The session list lock MUST be acquired before calling this function. Use
2073 * session_lock_list() and session_unlock_list().
2075 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2080 struct ltt_session
*session
;
2081 struct ltt_session_list
*list
= session_get_list();
2083 DBG("Getting all available session for UID %d GID %d",
2086 * Iterate over session list and append data after the control struct in
2089 cds_list_for_each_entry(session
, &list
->head
, list
) {
2091 * Only list the sessions the user can control.
2093 if (!session_access_ok(session
, uid
, gid
)) {
2097 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2098 struct ltt_ust_session
*usess
= session
->ust_session
;
2100 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2101 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2102 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2103 ret
= build_network_session_path(sessions
[i
].path
,
2104 sizeof(session
[i
].path
), session
);
2106 ret
= snprintf(sessions
[i
].path
, sizeof(session
[i
].path
), "%s",
2107 session
->consumer
->dst
.trace_path
);
2110 PERROR("snprintf session path");
2114 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2115 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2116 sessions
[i
].enabled
= session
->enabled
;
2122 * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
2124 int cmd_disable_consumer(int domain
, struct ltt_session
*session
)
2127 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2128 struct ltt_ust_session
*usess
= session
->ust_session
;
2129 struct consumer_output
*consumer
;
2133 if (session
->enabled
) {
2134 /* Can't disable consumer on an already started session */
2135 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2139 if (!session
->start_consumer
) {
2140 ret
= LTTNG_ERR_NO_CONSUMER
;
2146 DBG("Disable tracing session %s consumer", session
->name
);
2147 consumer
= session
->consumer
;
2149 case LTTNG_DOMAIN_KERNEL
:
2150 /* Code flow error if we don't have a kernel session here. */
2153 DBG("Disabling kernel consumer");
2154 consumer
= ksess
->consumer
;
2157 case LTTNG_DOMAIN_UST
:
2158 /* Code flow error if we don't have a UST session here. */
2161 DBG("Disabling UST consumer");
2162 consumer
= usess
->consumer
;
2166 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2171 consumer
->enabled
= 0;
2172 /* Success at this point */
2175 ret
= LTTNG_ERR_NO_CONSUMER
;
2183 * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
2185 int cmd_enable_consumer(int domain
, struct ltt_session
*session
)
2188 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2189 struct ltt_ust_session
*usess
= session
->ust_session
;
2190 struct consumer_output
*consumer
= NULL
;
2194 /* Can't enable consumer after session started. */
2195 if (session
->enabled
) {
2196 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2202 assert(session
->consumer
);
2203 consumer
= session
->consumer
;
2205 case LTTNG_DOMAIN_KERNEL
:
2206 /* Code flow error if we don't have a kernel session here. */
2210 * Check if we have already sent fds to the consumer. In that case,
2211 * the enable-consumer command can't be used because a start trace
2212 * had previously occured.
2214 if (ksess
->consumer_fds_sent
) {
2215 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2219 consumer
= ksess
->tmp_consumer
;
2220 if (consumer
== NULL
) {
2222 /* No temp. consumer output exists. Using the current one. */
2223 DBG3("No temporary consumer. Using default");
2224 consumer
= ksess
->consumer
;
2228 switch (consumer
->type
) {
2229 case CONSUMER_DST_LOCAL
:
2230 DBG2("Consumer output is local. Creating directory(ies)");
2232 /* Create directory(ies) */
2233 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2234 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2236 if (ret
!= -EEXIST
) {
2237 ERR("Trace directory creation error");
2238 ret
= LTTNG_ERR_FATAL
;
2243 case CONSUMER_DST_NET
:
2244 DBG2("Consumer output is network. Validating URIs");
2245 /* Validate if we have both control and data path set. */
2246 if (!consumer
->dst
.net
.control_isset
) {
2247 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2251 if (!consumer
->dst
.net
.data_isset
) {
2252 ret
= LTTNG_ERR_URL_DATA_MISS
;
2256 /* Check established network session state */
2257 if (session
->net_handle
== 0) {
2258 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2259 ERR("Session network handle is not set on enable-consumer");
2268 * This is race free for now since the session lock is acquired before
2269 * ending up in this function. No other threads can access this kernel
2270 * session without this lock hence freeing the consumer output object
2274 /* Destroy current consumer. We are about to replace it */
2275 consumer_destroy_output(ksess
->consumer
);
2277 ksess
->consumer
= consumer
;
2278 ksess
->tmp_consumer
= NULL
;
2281 case LTTNG_DOMAIN_UST
:
2282 /* Code flow error if we don't have a UST session here. */
2286 * Check if we have already sent fds to the consumer. In that case,
2287 * the enable-consumer command can't be used because a start trace
2288 * had previously occured.
2290 if (usess
->start_trace
) {
2291 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2295 consumer
= usess
->tmp_consumer
;
2296 if (consumer
== NULL
) {
2298 /* No temp. consumer output exists. Using the current one. */
2299 DBG3("No temporary consumer. Using default");
2300 consumer
= usess
->consumer
;
2304 switch (consumer
->type
) {
2305 case CONSUMER_DST_LOCAL
:
2306 DBG2("Consumer output is local. Creating directory(ies)");
2308 /* Create directory(ies) */
2309 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2310 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2312 if (ret
!= -EEXIST
) {
2313 ERR("Trace directory creation error");
2314 ret
= LTTNG_ERR_FATAL
;
2319 case CONSUMER_DST_NET
:
2320 DBG2("Consumer output is network. Validating URIs");
2321 /* Validate if we have both control and data path set. */
2322 if (!consumer
->dst
.net
.control_isset
) {
2323 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2327 if (!consumer
->dst
.net
.data_isset
) {
2328 ret
= LTTNG_ERR_URL_DATA_MISS
;
2332 /* Check established network session state */
2333 if (session
->net_handle
== 0) {
2334 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2335 DBG2("Session network handle is not set on enable-consumer");
2339 if (consumer
->net_seq_index
== -1) {
2340 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2341 DBG2("Network index is not set on the consumer");
2350 * This is race free for now since the session lock is acquired before
2351 * ending up in this function. No other threads can access this kernel
2352 * session without this lock hence freeing the consumer output object
2356 /* Destroy current consumer. We are about to replace it */
2357 consumer_destroy_output(usess
->consumer
);
2359 usess
->consumer
= consumer
;
2360 usess
->tmp_consumer
= NULL
;
2365 session
->start_consumer
= 1;
2369 consumer
->enabled
= 1;
2370 /* Success at this point */
2373 /* Should not really happend... */
2374 ret
= LTTNG_ERR_NO_CONSUMER
;
2382 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2383 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2385 int cmd_data_pending(struct ltt_session
*session
)
2388 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2389 struct ltt_ust_session
*usess
= session
->ust_session
;
2393 /* Session MUST be stopped to ask for data availability. */
2394 if (session
->enabled
) {
2395 ret
= LTTNG_ERR_SESSION_STARTED
;
2399 if (ksess
&& ksess
->consumer
) {
2400 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2402 /* Data is still being extracted for the kernel. */
2407 if (usess
&& usess
->consumer
) {
2408 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2410 /* Data is still being extracted for the kernel. */
2415 /* Data is ready to be read by a viewer */
2423 * Init command subsystem.
2428 * Set network sequence index to 1 for streams to match a relayd socket on
2429 * the consumer side.
2431 uatomic_set(&relayd_net_seq_idx
, 1);
2433 DBG("Command subsystem initialized");