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
));
104 if (strlen(tmp_uurl
) > 0) {
105 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
106 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
108 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, kdata_port
);
116 * Fill lttng_channel array of all channels.
118 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
119 struct lttng_channel
*channels
)
122 struct ltt_kernel_channel
*kchan
;
124 DBG("Listing channels for session %s", session
->name
);
127 case LTTNG_DOMAIN_KERNEL
:
128 /* Kernel channels */
129 if (session
->kernel_session
!= NULL
) {
130 cds_list_for_each_entry(kchan
,
131 &session
->kernel_session
->channel_list
.head
, list
) {
132 /* Copy lttng_channel struct to array */
133 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
134 channels
[i
].enabled
= kchan
->enabled
;
139 case LTTNG_DOMAIN_UST
:
141 struct lttng_ht_iter iter
;
142 struct ltt_ust_channel
*uchan
;
144 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
145 &iter
.iter
, uchan
, node
.node
) {
146 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
147 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
148 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
149 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
150 channels
[i
].attr
.switch_timer_interval
=
151 uchan
->attr
.switch_timer_interval
;
152 channels
[i
].attr
.read_timer_interval
=
153 uchan
->attr
.read_timer_interval
;
154 channels
[i
].enabled
= uchan
->enabled
;
155 switch (uchan
->attr
.output
) {
158 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
171 * Create a list of ust global domain events.
173 static int list_lttng_ust_global_events(char *channel_name
,
174 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
177 unsigned int nb_event
= 0;
178 struct lttng_ht_iter iter
;
179 struct lttng_ht_node_str
*node
;
180 struct ltt_ust_channel
*uchan
;
181 struct ltt_ust_event
*uevent
;
182 struct lttng_event
*tmp
;
184 DBG("Listing UST global events for channel %s", channel_name
);
188 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
189 node
= lttng_ht_iter_get_node_str(&iter
);
191 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
195 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
197 nb_event
+= lttng_ht_get_count(uchan
->events
);
204 DBG3("Listing UST global %d events", nb_event
);
206 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
208 ret
= LTTNG_ERR_FATAL
;
212 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
213 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
214 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
215 tmp
[i
].enabled
= uevent
->enabled
;
217 switch (uevent
->attr
.instrumentation
) {
218 case LTTNG_UST_TRACEPOINT
:
219 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
221 case LTTNG_UST_PROBE
:
222 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
224 case LTTNG_UST_FUNCTION
:
225 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
229 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
230 switch (uevent
->attr
.loglevel_type
) {
231 case LTTNG_UST_LOGLEVEL_ALL
:
232 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
234 case LTTNG_UST_LOGLEVEL_RANGE
:
235 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
237 case LTTNG_UST_LOGLEVEL_SINGLE
:
238 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
241 if (uevent
->filter
) {
256 * Fill lttng_event array of all kernel events in the channel.
258 static int list_lttng_kernel_events(char *channel_name
,
259 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
262 unsigned int nb_event
;
263 struct ltt_kernel_event
*event
;
264 struct ltt_kernel_channel
*kchan
;
266 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
268 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
272 nb_event
= kchan
->event_count
;
274 DBG("Listing events for channel %s", kchan
->channel
->name
);
280 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
281 if (*events
== NULL
) {
282 ret
= LTTNG_ERR_FATAL
;
286 /* Kernel channels */
287 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
288 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
289 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
290 (*events
)[i
].enabled
= event
->enabled
;
292 switch (event
->event
->instrumentation
) {
293 case LTTNG_KERNEL_TRACEPOINT
:
294 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
296 case LTTNG_KERNEL_KPROBE
:
297 case LTTNG_KERNEL_KRETPROBE
:
298 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
299 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
300 sizeof(struct lttng_kernel_kprobe
));
302 case LTTNG_KERNEL_FUNCTION
:
303 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
304 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
305 sizeof(struct lttng_kernel_function
));
307 case LTTNG_KERNEL_NOOP
:
308 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
310 case LTTNG_KERNEL_SYSCALL
:
311 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
313 case LTTNG_KERNEL_ALL
:
324 /* Negate the error code to differentiate the size from an error */
329 * Add URI so the consumer output object. Set the correct path depending on the
330 * domain adding the default trace directory.
332 static int add_uri_to_consumer(struct consumer_output
*consumer
,
333 struct lttng_uri
*uri
, int domain
, const char *session_name
)
336 const char *default_trace_dir
;
340 if (consumer
== NULL
) {
341 DBG("No consumer detected. Don't add URI. Stopping.");
342 ret
= LTTNG_ERR_NO_CONSUMER
;
347 case LTTNG_DOMAIN_KERNEL
:
348 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
350 case LTTNG_DOMAIN_UST
:
351 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
355 * This case is possible is we try to add the URI to the global tracing
356 * session consumer object which in this case there is no subdir.
358 default_trace_dir
= "";
361 switch (uri
->dtype
) {
364 DBG2("Setting network URI to consumer");
366 /* Set URI into consumer output object */
367 ret
= consumer_set_network_uri(consumer
, uri
);
369 ret
= LTTNG_ERR_FATAL
;
371 } else if (ret
== 1) {
373 * URI was the same in the consumer so we do not append the subdir
374 * again so to not duplicate output dir.
379 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
380 ret
= consumer_set_subdir(consumer
, session_name
);
382 ret
= LTTNG_ERR_FATAL
;
387 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
388 /* On a new subdir, reappend the default trace dir. */
389 strncat(consumer
->subdir
, default_trace_dir
,
390 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
391 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
396 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
397 memset(consumer
->dst
.trace_path
, 0,
398 sizeof(consumer
->dst
.trace_path
));
399 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
400 sizeof(consumer
->dst
.trace_path
));
401 /* Append default trace dir */
402 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
403 sizeof(consumer
->dst
.trace_path
) -
404 strlen(consumer
->dst
.trace_path
) - 1);
405 /* Flag consumer as local. */
406 consumer
->type
= CONSUMER_DST_LOCAL
;
415 * Init tracing by creating trace directory and sending fds kernel consumer.
417 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
420 struct lttng_ht_iter iter
;
421 struct consumer_socket
*socket
;
425 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
426 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
428 /* Code flow error */
429 assert(socket
->fd
>= 0);
431 pthread_mutex_lock(socket
->lock
);
432 ret
= kernel_consumer_send_session(socket
->fd
, session
);
433 pthread_mutex_unlock(socket
->lock
);
435 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
446 * Create a socket to the relayd using the URI.
448 * On success, the relayd_sock pointer is set to the created socket.
449 * Else, it's stays untouched and a lttcomm error code is returned.
451 static int create_connect_relayd(struct consumer_output
*output
,
452 const char *session_name
, struct lttng_uri
*uri
,
453 struct lttcomm_sock
**relayd_sock
)
456 struct lttcomm_sock
*sock
;
458 /* Create socket object from URI */
459 sock
= lttcomm_alloc_sock_from_uri(uri
);
461 ret
= LTTNG_ERR_FATAL
;
465 ret
= lttcomm_create_sock(sock
);
467 ret
= LTTNG_ERR_FATAL
;
471 /* Connect to relayd so we can proceed with a session creation. */
472 ret
= relayd_connect(sock
);
474 ERR("Unable to reach lttng-relayd");
475 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
479 /* Create socket for control stream. */
480 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
481 DBG3("Creating relayd stream socket from URI");
483 /* Check relayd version */
484 ret
= relayd_version_check(sock
, RELAYD_VERSION_COMM_MAJOR
,
485 RELAYD_VERSION_COMM_MINOR
);
487 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
490 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
491 DBG3("Creating relayd data socket from URI");
493 /* Command is not valid */
494 ERR("Relayd invalid stream type: %d", uri
->stype
);
495 ret
= LTTNG_ERR_INVALID
;
505 (void) relayd_close(sock
);
509 lttcomm_destroy_sock(sock
);
516 * Connect to the relayd using URI and send the socket to the right consumer.
518 static int send_consumer_relayd_socket(int domain
, struct ltt_session
*session
,
519 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
523 struct lttcomm_sock
*sock
= NULL
;
525 /* Set the network sequence index if not set. */
526 if (consumer
->net_seq_index
== -1) {
528 * Increment net_seq_idx because we are about to transfer the
529 * new relayd socket to the consumer.
531 uatomic_inc(&relayd_net_seq_idx
);
532 /* Assign unique key so the consumer can match streams */
533 uatomic_set(&consumer
->net_seq_index
,
534 uatomic_read(&relayd_net_seq_idx
));
537 /* Connect to relayd and make version check if uri is the control. */
538 ret
= create_connect_relayd(consumer
, session
->name
, relayd_uri
, &sock
);
539 if (ret
!= LTTNG_OK
) {
543 /* If the control socket is connected, network session is ready */
544 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
545 session
->net_handle
= 1;
548 /* Send relayd socket to consumer. */
549 ret
= consumer_send_relayd_socket(consumer_fd
, sock
,
550 consumer
, relayd_uri
->stype
);
552 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
559 * Close socket which was dup on the consumer side. The session daemon does
560 * NOT keep track of the relayd socket(s) once transfer to the consumer.
565 (void) relayd_close(sock
);
566 lttcomm_destroy_sock(sock
);
573 * Send both relayd sockets to a specific consumer and domain. This is a
574 * helper function to facilitate sending the information to the consumer for a
577 static int send_consumer_relayd_sockets(int domain
,
578 struct ltt_session
*session
, struct consumer_output
*consumer
, int fd
)
585 /* Don't resend the sockets to the consumer. */
586 if (consumer
->dst
.net
.relayd_socks_sent
) {
591 /* Sending control relayd socket. */
592 ret
= send_consumer_relayd_socket(domain
, session
,
593 &consumer
->dst
.net
.control
, consumer
, fd
);
594 if (ret
!= LTTNG_OK
) {
598 /* Sending data relayd socket. */
599 ret
= send_consumer_relayd_socket(domain
, session
,
600 &consumer
->dst
.net
.data
, consumer
, fd
);
601 if (ret
!= LTTNG_OK
) {
605 /* Flag that all relayd sockets were sent to the consumer. */
606 consumer
->dst
.net
.relayd_socks_sent
= 1;
613 * Setup relayd connections for a tracing session. First creates the socket to
614 * the relayd and send them to the right domain consumer. Consumer type MUST be
617 static int setup_relayd(struct ltt_session
*session
)
620 struct ltt_ust_session
*usess
;
621 struct ltt_kernel_session
*ksess
;
622 struct consumer_socket
*socket
;
623 struct lttng_ht_iter iter
;
627 usess
= session
->ust_session
;
628 ksess
= session
->kernel_session
;
630 DBG2("Setting relayd for session %s", session
->name
);
632 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
633 && usess
->consumer
->enabled
) {
634 /* For each consumer socket, send relayd sockets */
635 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
637 /* Code flow error */
638 assert(socket
->fd
>= 0);
640 pthread_mutex_lock(socket
->lock
);
641 send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
,
642 usess
->consumer
, socket
->fd
);
643 pthread_mutex_unlock(socket
->lock
);
644 if (ret
!= LTTNG_OK
) {
650 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
651 && ksess
->consumer
->enabled
) {
652 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
654 /* Code flow error */
655 assert(socket
->fd
>= 0);
657 pthread_mutex_lock(socket
->lock
);
658 send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
,
659 ksess
->consumer
, socket
->fd
);
660 pthread_mutex_unlock(socket
->lock
);
661 if (ret
!= LTTNG_OK
) {
672 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
674 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
678 struct ltt_ust_session
*usess
;
680 usess
= session
->ust_session
;
683 case LTTNG_DOMAIN_KERNEL
:
685 ret
= channel_kernel_disable(session
->kernel_session
,
687 if (ret
!= LTTNG_OK
) {
691 kernel_wait_quiescent(kernel_tracer_fd
);
694 case LTTNG_DOMAIN_UST
:
696 struct ltt_ust_channel
*uchan
;
697 struct lttng_ht
*chan_ht
;
699 chan_ht
= usess
->domain_global
.channels
;
701 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
703 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
707 ret
= channel_ust_disable(usess
, domain
, uchan
);
708 if (ret
!= LTTNG_OK
) {
714 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
715 case LTTNG_DOMAIN_UST_EXEC_NAME
:
716 case LTTNG_DOMAIN_UST_PID
:
719 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
730 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
732 * The wpipe arguments is used as a notifier for the kernel thread.
734 int cmd_enable_channel(struct ltt_session
*session
,
735 int domain
, struct lttng_channel
*attr
, int wpipe
)
738 struct ltt_ust_session
*usess
= session
->ust_session
;
739 struct lttng_ht
*chan_ht
;
744 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
747 case LTTNG_DOMAIN_KERNEL
:
749 struct ltt_kernel_channel
*kchan
;
751 /* Mandatory for a kernel channel. */
754 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
755 session
->kernel_session
);
757 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
759 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
762 if (ret
!= LTTNG_OK
) {
766 kernel_wait_quiescent(kernel_tracer_fd
);
769 case LTTNG_DOMAIN_UST
:
771 struct ltt_ust_channel
*uchan
;
773 chan_ht
= usess
->domain_global
.channels
;
775 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
777 ret
= channel_ust_create(usess
, domain
, attr
);
779 ret
= channel_ust_enable(usess
, domain
, uchan
);
784 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
785 case LTTNG_DOMAIN_UST_EXEC_NAME
:
786 case LTTNG_DOMAIN_UST_PID
:
789 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
799 * Command LTTNG_DISABLE_EVENT processed by the client thread.
801 int cmd_disable_event(struct ltt_session
*session
, int domain
,
802 char *channel_name
, char *event_name
)
807 case LTTNG_DOMAIN_KERNEL
:
809 struct ltt_kernel_channel
*kchan
;
810 struct ltt_kernel_session
*ksess
;
812 ksess
= session
->kernel_session
;
814 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
816 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
820 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
821 if (ret
!= LTTNG_OK
) {
825 kernel_wait_quiescent(kernel_tracer_fd
);
828 case LTTNG_DOMAIN_UST
:
830 struct ltt_ust_channel
*uchan
;
831 struct ltt_ust_session
*usess
;
833 usess
= session
->ust_session
;
835 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
838 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
842 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
843 if (ret
!= LTTNG_OK
) {
847 DBG3("Disable UST event %s in channel %s completed", event_name
,
852 case LTTNG_DOMAIN_UST_EXEC_NAME
:
853 case LTTNG_DOMAIN_UST_PID
:
854 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
868 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
870 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
876 case LTTNG_DOMAIN_KERNEL
:
878 struct ltt_kernel_session
*ksess
;
879 struct ltt_kernel_channel
*kchan
;
881 ksess
= session
->kernel_session
;
883 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
885 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
889 ret
= event_kernel_disable_all(ksess
, kchan
);
890 if (ret
!= LTTNG_OK
) {
894 kernel_wait_quiescent(kernel_tracer_fd
);
897 case LTTNG_DOMAIN_UST
:
899 struct ltt_ust_session
*usess
;
900 struct ltt_ust_channel
*uchan
;
902 usess
= session
->ust_session
;
904 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
907 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
911 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
916 DBG3("Disable all UST events in channel %s completed", channel_name
);
921 case LTTNG_DOMAIN_UST_EXEC_NAME
:
922 case LTTNG_DOMAIN_UST_PID
:
923 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
937 * Command LTTNG_ADD_CONTEXT processed by the client thread.
939 int cmd_add_context(struct ltt_session
*session
, int domain
,
940 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
945 case LTTNG_DOMAIN_KERNEL
:
946 /* Add kernel context to kernel tracer */
947 ret
= context_kernel_add(session
->kernel_session
, ctx
,
948 event_name
, channel_name
);
949 if (ret
!= LTTNG_OK
) {
953 case LTTNG_DOMAIN_UST
:
955 struct ltt_ust_session
*usess
= session
->ust_session
;
959 ret
= context_ust_add(usess
, domain
, ctx
, event_name
, channel_name
);
960 if (ret
!= LTTNG_OK
) {
966 case LTTNG_DOMAIN_UST_EXEC_NAME
:
967 case LTTNG_DOMAIN_UST_PID
:
968 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
982 * Command LTTNG_SET_FILTER processed by the client thread.
984 int cmd_set_filter(struct ltt_session
*session
, int domain
,
985 char *channel_name
, char *event_name
,
986 struct lttng_filter_bytecode
*bytecode
)
991 case LTTNG_DOMAIN_KERNEL
:
992 ret
= LTTNG_ERR_FATAL
;
994 case LTTNG_DOMAIN_UST
:
996 struct ltt_ust_session
*usess
= session
->ust_session
;
998 ret
= filter_ust_set(usess
, domain
, bytecode
, event_name
, channel_name
);
999 if (ret
!= LTTNG_OK
) {
1005 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1006 case LTTNG_DOMAIN_UST_PID
:
1007 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1010 ret
= LTTNG_ERR_UND
;
1023 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1025 int cmd_enable_event(struct ltt_session
*session
, int domain
,
1026 char *channel_name
, struct lttng_event
*event
, int wpipe
)
1029 struct lttng_channel
*attr
;
1033 assert(channel_name
);
1036 case LTTNG_DOMAIN_KERNEL
:
1038 struct ltt_kernel_channel
*kchan
;
1040 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1041 session
->kernel_session
);
1042 if (kchan
== NULL
) {
1043 attr
= channel_new_default_attr(domain
);
1045 ret
= LTTNG_ERR_FATAL
;
1048 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1050 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1051 if (ret
!= LTTNG_OK
) {
1058 /* Get the newly created kernel channel pointer */
1059 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1060 session
->kernel_session
);
1061 if (kchan
== NULL
) {
1062 /* This sould not happen... */
1063 ret
= LTTNG_ERR_FATAL
;
1067 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
1069 if (ret
!= LTTNG_OK
) {
1073 kernel_wait_quiescent(kernel_tracer_fd
);
1076 case LTTNG_DOMAIN_UST
:
1078 struct ltt_ust_channel
*uchan
;
1079 struct ltt_ust_session
*usess
= session
->ust_session
;
1083 /* Get channel from global UST domain */
1084 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1086 if (uchan
== NULL
) {
1087 /* Create default channel */
1088 attr
= channel_new_default_attr(domain
);
1090 ret
= LTTNG_ERR_FATAL
;
1093 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1095 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1096 if (ret
!= LTTNG_OK
) {
1102 /* Get the newly created channel reference back */
1103 uchan
= trace_ust_find_channel_by_name(
1104 usess
->domain_global
.channels
, channel_name
);
1108 /* At this point, the session and channel exist on the tracer */
1109 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
);
1110 if (ret
!= LTTNG_OK
) {
1116 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1117 case LTTNG_DOMAIN_UST_PID
:
1118 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1121 ret
= LTTNG_ERR_UND
;
1132 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1134 int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
1135 char *channel_name
, int event_type
, int wpipe
)
1138 struct lttng_channel
*attr
;
1141 assert(channel_name
);
1144 case LTTNG_DOMAIN_KERNEL
:
1146 struct ltt_kernel_channel
*kchan
;
1148 assert(session
->kernel_session
);
1150 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1151 session
->kernel_session
);
1152 if (kchan
== NULL
) {
1153 /* Create default channel */
1154 attr
= channel_new_default_attr(domain
);
1156 ret
= LTTNG_ERR_FATAL
;
1159 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1161 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1162 if (ret
!= LTTNG_OK
) {
1168 /* Get the newly created kernel channel pointer */
1169 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1170 session
->kernel_session
);
1174 switch (event_type
) {
1175 case LTTNG_EVENT_SYSCALL
:
1176 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
1177 kchan
, kernel_tracer_fd
);
1179 case LTTNG_EVENT_TRACEPOINT
:
1181 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1182 * events already registered to the channel.
1184 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
1185 kchan
, kernel_tracer_fd
);
1187 case LTTNG_EVENT_ALL
:
1188 /* Enable syscalls and tracepoints */
1189 ret
= event_kernel_enable_all(session
->kernel_session
,
1190 kchan
, kernel_tracer_fd
);
1193 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1197 /* Manage return value */
1198 if (ret
!= LTTNG_OK
) {
1202 kernel_wait_quiescent(kernel_tracer_fd
);
1205 case LTTNG_DOMAIN_UST
:
1207 struct ltt_ust_channel
*uchan
;
1208 struct ltt_ust_session
*usess
= session
->ust_session
;
1212 /* Get channel from global UST domain */
1213 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1215 if (uchan
== NULL
) {
1216 /* Create default channel */
1217 attr
= channel_new_default_attr(domain
);
1219 ret
= LTTNG_ERR_FATAL
;
1222 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1224 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1225 if (ret
!= LTTNG_OK
) {
1231 /* Get the newly created channel reference back */
1232 uchan
= trace_ust_find_channel_by_name(
1233 usess
->domain_global
.channels
, channel_name
);
1237 /* At this point, the session and channel exist on the tracer */
1239 switch (event_type
) {
1240 case LTTNG_EVENT_ALL
:
1241 case LTTNG_EVENT_TRACEPOINT
:
1242 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
);
1243 if (ret
!= LTTNG_OK
) {
1248 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1252 /* Manage return value */
1253 if (ret
!= LTTNG_OK
) {
1260 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1261 case LTTNG_DOMAIN_UST_PID
:
1262 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1265 ret
= LTTNG_ERR_UND
;
1277 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1279 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1282 ssize_t nb_events
= 0;
1285 case LTTNG_DOMAIN_KERNEL
:
1286 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1287 if (nb_events
< 0) {
1288 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1292 case LTTNG_DOMAIN_UST
:
1293 nb_events
= ust_app_list_events(events
);
1294 if (nb_events
< 0) {
1295 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1300 ret
= LTTNG_ERR_UND
;
1307 /* Return negative value to differentiate return code */
1312 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1314 ssize_t
cmd_list_tracepoint_fields(int domain
,
1315 struct lttng_event_field
**fields
)
1318 ssize_t nb_fields
= 0;
1321 case LTTNG_DOMAIN_UST
:
1322 nb_fields
= ust_app_list_event_fields(fields
);
1323 if (nb_fields
< 0) {
1324 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1328 case LTTNG_DOMAIN_KERNEL
:
1329 default: /* fall-through */
1330 ret
= LTTNG_ERR_UND
;
1337 /* Return negative value to differentiate return code */
1342 * Command LTTNG_START_TRACE processed by the client thread.
1344 int cmd_start_trace(struct ltt_session
*session
)
1347 struct ltt_kernel_session
*ksession
;
1348 struct ltt_ust_session
*usess
;
1349 struct ltt_kernel_channel
*kchan
;
1353 /* Ease our life a bit ;) */
1354 ksession
= session
->kernel_session
;
1355 usess
= session
->ust_session
;
1357 if (session
->enabled
) {
1358 /* Already started. */
1359 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1363 session
->enabled
= 1;
1365 ret
= setup_relayd(session
);
1366 if (ret
!= LTTNG_OK
) {
1367 ERR("Error setting up relayd for session %s", session
->name
);
1371 /* Kernel tracing */
1372 if (ksession
!= NULL
) {
1373 /* Open kernel metadata */
1374 if (ksession
->metadata
== NULL
) {
1375 ret
= kernel_open_metadata(ksession
);
1377 ret
= LTTNG_ERR_KERN_META_FAIL
;
1382 /* Open kernel metadata stream */
1383 if (ksession
->metadata_stream_fd
< 0) {
1384 ret
= kernel_open_metadata_stream(ksession
);
1386 ERR("Kernel create metadata stream failed");
1387 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1392 /* For each channel */
1393 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1394 if (kchan
->stream_count
== 0) {
1395 ret
= kernel_open_channel_stream(kchan
);
1397 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1400 /* Update the stream global counter */
1401 ksession
->stream_count_global
+= ret
;
1405 /* Setup kernel consumer socket and send fds to it */
1406 ret
= init_kernel_tracing(ksession
);
1408 ret
= LTTNG_ERR_KERN_START_FAIL
;
1412 /* This start the kernel tracing */
1413 ret
= kernel_start_session(ksession
);
1415 ret
= LTTNG_ERR_KERN_START_FAIL
;
1419 /* Quiescent wait after starting trace */
1420 kernel_wait_quiescent(kernel_tracer_fd
);
1423 /* Flag session that trace should start automatically */
1425 usess
->start_trace
= 1;
1427 ret
= ust_app_start_trace_all(usess
);
1429 ret
= LTTNG_ERR_UST_START_FAIL
;
1441 * Command LTTNG_STOP_TRACE processed by the client thread.
1443 int cmd_stop_trace(struct ltt_session
*session
)
1446 struct ltt_kernel_channel
*kchan
;
1447 struct ltt_kernel_session
*ksession
;
1448 struct ltt_ust_session
*usess
;
1453 ksession
= session
->kernel_session
;
1454 usess
= session
->ust_session
;
1456 if (!session
->enabled
) {
1457 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1461 session
->enabled
= 0;
1465 DBG("Stop kernel tracing");
1467 /* Flush metadata if exist */
1468 if (ksession
->metadata_stream_fd
>= 0) {
1469 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1471 ERR("Kernel metadata flush failed");
1475 /* Flush all buffers before stopping */
1476 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1477 ret
= kernel_flush_buffer(kchan
);
1479 ERR("Kernel flush buffer error");
1483 ret
= kernel_stop_session(ksession
);
1485 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1489 kernel_wait_quiescent(kernel_tracer_fd
);
1493 usess
->start_trace
= 0;
1495 ret
= ust_app_stop_trace_all(usess
);
1497 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1509 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1511 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1512 size_t nb_uri
, struct lttng_uri
*uris
)
1515 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1516 struct ltt_ust_session
*usess
= session
->ust_session
;
1517 struct consumer_output
*consumer
= NULL
;
1523 /* Can't enable consumer after session started. */
1524 if (session
->enabled
) {
1525 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1529 if (!session
->start_consumer
) {
1530 ret
= LTTNG_ERR_NO_CONSUMER
;
1535 * This case switch makes sure the domain session has a temporary consumer
1536 * so the URL can be set.
1540 /* Code flow error. A session MUST always have a consumer object */
1541 assert(session
->consumer
);
1543 * The URL will be added to the tracing session consumer instead of a
1544 * specific domain consumer.
1546 consumer
= session
->consumer
;
1548 case LTTNG_DOMAIN_KERNEL
:
1549 /* Code flow error if we don't have a kernel session here. */
1552 /* Create consumer output if none exists */
1553 consumer
= ksess
->tmp_consumer
;
1554 if (consumer
== NULL
) {
1555 consumer
= consumer_copy_output(ksess
->consumer
);
1556 if (consumer
== NULL
) {
1557 ret
= LTTNG_ERR_FATAL
;
1560 /* Trash the consumer subdir, we are about to set a new one. */
1561 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1562 ksess
->tmp_consumer
= consumer
;
1566 case LTTNG_DOMAIN_UST
:
1567 /* Code flow error if we don't have a kernel session here. */
1570 /* Create consumer output if none exists */
1571 consumer
= usess
->tmp_consumer
;
1572 if (consumer
== NULL
) {
1573 consumer
= consumer_copy_output(usess
->consumer
);
1574 if (consumer
== NULL
) {
1575 ret
= LTTNG_ERR_FATAL
;
1578 /* Trash the consumer subdir, we are about to set a new one. */
1579 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1580 usess
->tmp_consumer
= consumer
;
1586 for (i
= 0; i
< nb_uri
; i
++) {
1587 struct consumer_socket
*socket
;
1588 struct lttng_ht_iter iter
;
1590 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1596 * Don't send relayd socket if URI is NOT remote or if the relayd
1597 * sockets for the session are already sent.
1599 if (uris
[i
].dtype
== LTTNG_DST_PATH
||
1600 consumer
->dst
.net
.relayd_socks_sent
) {
1604 /* Try to send relayd URI to the consumer if exist. */
1606 cds_lfht_for_each_entry(consumer
->socks
->ht
, &iter
.iter
,
1607 socket
, node
.node
) {
1609 /* A socket in the HT should never have a negative fd */
1610 assert(socket
->fd
>= 0);
1612 pthread_mutex_lock(socket
->lock
);
1613 ret
= send_consumer_relayd_socket(domain
, session
, &uris
[i
],
1614 consumer
, socket
->fd
);
1615 pthread_mutex_unlock(socket
->lock
);
1616 if (ret
!= LTTNG_OK
) {
1632 * Command LTTNG_CREATE_SESSION processed by the client thread.
1634 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1635 size_t nb_uri
, lttng_sock_cred
*creds
)
1639 struct ltt_session
*session
;
1644 * Verify if the session already exist
1646 * XXX: There is no need for the session lock list here since the caller
1647 * (process_client_msg) is holding it. We might want to change that so a
1648 * single command does not lock the entire session list.
1650 session
= session_find_by_name(name
);
1651 if (session
!= NULL
) {
1652 ret
= LTTNG_ERR_EXIST_SESS
;
1656 /* Create tracing session in the registry */
1657 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
1658 LTTNG_SOCK_GET_GID_CRED(creds
));
1659 if (ret
!= LTTNG_OK
) {
1664 * Get the newly created session pointer back
1666 * XXX: There is no need for the session lock list here since the caller
1667 * (process_client_msg) is holding it. We might want to change that so a
1668 * single command does not lock the entire session list.
1670 session
= session_find_by_name(name
);
1673 /* Create default consumer output for the session not yet created. */
1674 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1675 if (session
->consumer
== NULL
) {
1676 ret
= LTTNG_ERR_FATAL
;
1677 goto consumer_error
;
1681 * This means that the lttng_create_session call was called with the _path_
1682 * argument set to NULL.
1686 * At this point, we'll skip the consumer URI setup and create a
1687 * session with a NULL path which will flag the session to NOT spawn a
1690 DBG("Create session %s with NO uri, skipping consumer setup", name
);
1694 session
->start_consumer
= 1;
1696 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1697 if (ret
!= LTTNG_OK
) {
1698 goto consumer_error
;
1701 session
->consumer
->enabled
= 1;
1707 session_destroy(session
);
1714 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1716 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1719 struct ltt_ust_session
*usess
;
1720 struct ltt_kernel_session
*ksess
;
1725 usess
= session
->ust_session
;
1726 ksess
= session
->kernel_session
;
1728 /* Clean kernel session teardown */
1729 kernel_destroy_session(ksess
);
1731 /* UST session teardown */
1733 /* Close any relayd session */
1734 consumer_output_send_destroy_relayd(usess
->consumer
);
1736 /* Destroy every UST application related to this session. */
1737 ret
= ust_app_destroy_trace_all(usess
);
1739 ERR("Error in ust_app_destroy_trace_all");
1742 /* Clean up the rest. */
1743 trace_ust_destroy_session(usess
);
1747 * Must notify the kernel thread here to update it's poll set in order to
1748 * remove the channel(s)' fd just destroyed.
1750 ret
= notify_thread_pipe(wpipe
);
1752 PERROR("write kernel poll pipe");
1755 ret
= session_destroy(session
);
1761 * Command LTTNG_CALIBRATE processed by the client thread.
1763 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1768 case LTTNG_DOMAIN_KERNEL
:
1770 struct lttng_kernel_calibrate kcalibrate
;
1772 kcalibrate
.type
= calibrate
->type
;
1773 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1775 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1780 case LTTNG_DOMAIN_UST
:
1782 struct lttng_ust_calibrate ucalibrate
;
1784 ucalibrate
.type
= calibrate
->type
;
1785 ret
= ust_app_calibrate_glb(&ucalibrate
);
1787 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1793 ret
= LTTNG_ERR_UND
;
1804 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1806 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1807 const char *sock_path
, struct consumer_data
*cdata
)
1810 struct consumer_socket
*socket
;
1817 case LTTNG_DOMAIN_KERNEL
:
1819 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1823 /* Can't register a consumer if there is already one */
1824 if (ksess
->consumer_fds_sent
!= 0) {
1825 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1829 sock
= lttcomm_connect_unix_sock(sock_path
);
1831 ret
= LTTNG_ERR_CONNECT_FAIL
;
1835 socket
= consumer_allocate_socket(sock
);
1836 if (socket
== NULL
) {
1837 ret
= LTTNG_ERR_FATAL
;
1842 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1843 if (socket
->lock
== NULL
) {
1844 PERROR("zmalloc pthread mutex");
1845 ret
= LTTNG_ERR_FATAL
;
1848 pthread_mutex_init(socket
->lock
, NULL
);
1849 socket
->registered
= 1;
1852 consumer_add_socket(socket
, ksess
->consumer
);
1855 pthread_mutex_lock(&cdata
->pid_mutex
);
1857 pthread_mutex_unlock(&cdata
->pid_mutex
);
1862 /* TODO: Userspace tracing */
1863 ret
= LTTNG_ERR_UND
;
1874 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1876 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1877 struct lttng_domain
**domains
)
1882 if (session
->kernel_session
!= NULL
) {
1883 DBG3("Listing domains found kernel domain");
1887 if (session
->ust_session
!= NULL
) {
1888 DBG3("Listing domains found UST global domain");
1892 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1893 if (*domains
== NULL
) {
1894 ret
= LTTNG_ERR_FATAL
;
1898 if (session
->kernel_session
!= NULL
) {
1899 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1903 if (session
->ust_session
!= NULL
) {
1904 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1911 /* Return negative value to differentiate return code */
1917 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1919 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1920 struct lttng_channel
**channels
)
1923 ssize_t nb_chan
= 0;
1926 case LTTNG_DOMAIN_KERNEL
:
1927 if (session
->kernel_session
!= NULL
) {
1928 nb_chan
= session
->kernel_session
->channel_count
;
1930 DBG3("Number of kernel channels %zd", nb_chan
);
1932 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1935 case LTTNG_DOMAIN_UST
:
1936 if (session
->ust_session
!= NULL
) {
1937 nb_chan
= lttng_ht_get_count(
1938 session
->ust_session
->domain_global
.channels
);
1940 DBG3("Number of UST global channels %zd", nb_chan
);
1942 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1947 ret
= LTTNG_ERR_UND
;
1952 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
1953 if (*channels
== NULL
) {
1954 ret
= LTTNG_ERR_FATAL
;
1958 list_lttng_channels(domain
, session
, *channels
);
1961 /* Ret value was set in the domain switch case */
1968 /* Return negative value to differentiate return code */
1973 * Command LTTNG_LIST_EVENTS processed by the client thread.
1975 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
1976 char *channel_name
, struct lttng_event
**events
)
1979 ssize_t nb_event
= 0;
1982 case LTTNG_DOMAIN_KERNEL
:
1983 if (session
->kernel_session
!= NULL
) {
1984 nb_event
= list_lttng_kernel_events(channel_name
,
1985 session
->kernel_session
, events
);
1988 case LTTNG_DOMAIN_UST
:
1990 if (session
->ust_session
!= NULL
) {
1991 nb_event
= list_lttng_ust_global_events(channel_name
,
1992 &session
->ust_session
->domain_global
, events
);
1997 ret
= LTTNG_ERR_UND
;
2004 /* Return negative value to differentiate return code */
2009 * Using the session list, filled a lttng_session array to send back to the
2010 * client for session listing.
2012 * The session list lock MUST be acquired before calling this function. Use
2013 * session_lock_list() and session_unlock_list().
2015 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2020 struct ltt_session
*session
;
2021 struct ltt_session_list
*list
= session_get_list();
2023 DBG("Getting all available session for UID %d GID %d",
2026 * Iterate over session list and append data after the control struct in
2029 cds_list_for_each_entry(session
, &list
->head
, list
) {
2031 * Only list the sessions the user can control.
2033 if (!session_access_ok(session
, uid
, gid
)) {
2037 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2038 struct ltt_ust_session
*usess
= session
->ust_session
;
2040 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2041 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2042 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2043 ret
= build_network_session_path(sessions
[i
].path
,
2044 sizeof(session
[i
].path
), session
);
2046 ret
= snprintf(sessions
[i
].path
, sizeof(session
[i
].path
), "%s",
2047 session
->consumer
->dst
.trace_path
);
2050 PERROR("snprintf session path");
2054 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2055 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2056 sessions
[i
].enabled
= session
->enabled
;
2062 * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
2064 int cmd_disable_consumer(int domain
, struct ltt_session
*session
)
2067 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2068 struct ltt_ust_session
*usess
= session
->ust_session
;
2069 struct consumer_output
*consumer
;
2073 if (session
->enabled
) {
2074 /* Can't disable consumer on an already started session */
2075 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2079 if (!session
->start_consumer
) {
2080 ret
= LTTNG_ERR_NO_CONSUMER
;
2086 DBG("Disable tracing session %s consumer", session
->name
);
2087 consumer
= session
->consumer
;
2089 case LTTNG_DOMAIN_KERNEL
:
2090 /* Code flow error if we don't have a kernel session here. */
2093 DBG("Disabling kernel consumer");
2094 consumer
= ksess
->consumer
;
2097 case LTTNG_DOMAIN_UST
:
2098 /* Code flow error if we don't have a UST session here. */
2101 DBG("Disabling UST consumer");
2102 consumer
= usess
->consumer
;
2106 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2111 consumer
->enabled
= 0;
2112 /* Success at this point */
2115 ret
= LTTNG_ERR_NO_CONSUMER
;
2123 * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
2125 int cmd_enable_consumer(int domain
, struct ltt_session
*session
)
2128 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2129 struct ltt_ust_session
*usess
= session
->ust_session
;
2130 struct consumer_output
*consumer
= NULL
;
2134 /* Can't enable consumer after session started. */
2135 if (session
->enabled
) {
2136 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2140 if (!session
->start_consumer
) {
2141 ret
= LTTNG_ERR_NO_CONSUMER
;
2147 assert(session
->consumer
);
2148 consumer
= session
->consumer
;
2150 case LTTNG_DOMAIN_KERNEL
:
2151 /* Code flow error if we don't have a kernel session here. */
2155 * Check if we have already sent fds to the consumer. In that case,
2156 * the enable-consumer command can't be used because a start trace
2157 * had previously occured.
2159 if (ksess
->consumer_fds_sent
) {
2160 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2164 consumer
= ksess
->tmp_consumer
;
2165 if (consumer
== NULL
) {
2167 /* No temp. consumer output exists. Using the current one. */
2168 DBG3("No temporary consumer. Using default");
2169 consumer
= ksess
->consumer
;
2173 switch (consumer
->type
) {
2174 case CONSUMER_DST_LOCAL
:
2175 DBG2("Consumer output is local. Creating directory(ies)");
2177 /* Create directory(ies) */
2178 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2179 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2181 if (ret
!= -EEXIST
) {
2182 ERR("Trace directory creation error");
2183 ret
= LTTNG_ERR_FATAL
;
2188 case CONSUMER_DST_NET
:
2189 DBG2("Consumer output is network. Validating URIs");
2190 /* Validate if we have both control and data path set. */
2191 if (!consumer
->dst
.net
.control_isset
) {
2192 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2196 if (!consumer
->dst
.net
.data_isset
) {
2197 ret
= LTTNG_ERR_URL_DATA_MISS
;
2201 /* Check established network session state */
2202 if (session
->net_handle
== 0) {
2203 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2204 ERR("Session network handle is not set on enable-consumer");
2211 /* Append default kernel trace dir to subdir */
2212 strncat(ksess
->consumer
->subdir
, DEFAULT_KERNEL_TRACE_DIR
,
2213 sizeof(ksess
->consumer
->subdir
) -
2214 strlen(ksess
->consumer
->subdir
) - 1);
2218 * This is race free for now since the session lock is acquired before
2219 * ending up in this function. No other threads can access this kernel
2220 * session without this lock hence freeing the consumer output object
2224 consumer_destroy_output(ksess
->consumer
);
2226 ksess
->consumer
= consumer
;
2227 ksess
->tmp_consumer
= NULL
;
2230 case LTTNG_DOMAIN_UST
:
2231 /* Code flow error if we don't have a UST session here. */
2235 * Check if we have already sent fds to the consumer. In that case,
2236 * the enable-consumer command can't be used because a start trace
2237 * had previously occured.
2239 if (usess
->start_trace
) {
2240 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2244 consumer
= usess
->tmp_consumer
;
2245 if (consumer
== NULL
) {
2247 /* No temp. consumer output exists. Using the current one. */
2248 DBG3("No temporary consumer. Using default");
2249 consumer
= usess
->consumer
;
2253 switch (consumer
->type
) {
2254 case CONSUMER_DST_LOCAL
:
2255 DBG2("Consumer output is local. Creating directory(ies)");
2257 /* Create directory(ies) */
2258 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2259 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2261 if (ret
!= -EEXIST
) {
2262 ERR("Trace directory creation error");
2263 ret
= LTTNG_ERR_FATAL
;
2268 case CONSUMER_DST_NET
:
2269 DBG2("Consumer output is network. Validating URIs");
2270 /* Validate if we have both control and data path set. */
2271 if (!consumer
->dst
.net
.control_isset
) {
2272 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2276 if (!consumer
->dst
.net
.data_isset
) {
2277 ret
= LTTNG_ERR_URL_DATA_MISS
;
2281 /* Check established network session state */
2282 if (session
->net_handle
== 0) {
2283 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2284 DBG2("Session network handle is not set on enable-consumer");
2288 if (consumer
->net_seq_index
== -1) {
2289 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2290 DBG2("Network index is not set on the consumer");
2297 /* Append default kernel trace dir to subdir */
2298 strncat(usess
->consumer
->subdir
, DEFAULT_UST_TRACE_DIR
,
2299 sizeof(usess
->consumer
->subdir
) -
2300 strlen(usess
->consumer
->subdir
) - 1);
2304 * This is race free for now since the session lock is acquired before
2305 * ending up in this function. No other threads can access this kernel
2306 * session without this lock hence freeing the consumer output object
2310 consumer_destroy_output(usess
->consumer
);
2312 usess
->consumer
= consumer
;
2313 usess
->tmp_consumer
= NULL
;
2320 consumer
->enabled
= 1;
2321 /* Success at this point */
2324 /* Should not really happend... */
2325 ret
= LTTNG_ERR_NO_CONSUMER
;
2333 * Init command subsystem.
2338 * Set network sequence index to 1 for streams to match a relayd socket on
2339 * the consumer side.
2341 uatomic_set(&relayd_net_seq_idx
, 1);
2343 DBG("Command subsystem initialized");