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
= -LTTCOMM_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
= -LTTCOMM_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
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
272 nb_event
= kchan
->event_count
;
274 DBG("Listing events for channel %s", kchan
->channel
->name
);
281 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
282 if (*events
== NULL
) {
287 /* Kernel channels */
288 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
289 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
290 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
291 (*events
)[i
].enabled
= event
->enabled
;
293 switch (event
->event
->instrumentation
) {
294 case LTTNG_KERNEL_TRACEPOINT
:
295 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
297 case LTTNG_KERNEL_KPROBE
:
298 case LTTNG_KERNEL_KRETPROBE
:
299 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
300 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
301 sizeof(struct lttng_kernel_kprobe
));
303 case LTTNG_KERNEL_FUNCTION
:
304 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
305 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
306 sizeof(struct lttng_kernel_function
));
308 case LTTNG_KERNEL_NOOP
:
309 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
311 case LTTNG_KERNEL_SYSCALL
:
312 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
314 case LTTNG_KERNEL_ALL
:
328 * Add URI so the consumer output object. Set the correct path depending on the
329 * domain adding the default trace directory.
331 static int add_uri_to_consumer(struct consumer_output
*consumer
,
332 struct lttng_uri
*uri
, int domain
, const char *session_name
)
334 int ret
= LTTCOMM_OK
;
335 const char *default_trace_dir
;
339 if (consumer
== NULL
) {
340 DBG("No consumer detected. Don't add URI. Stopping.");
341 ret
= LTTCOMM_NO_CONSUMER
;
346 case LTTNG_DOMAIN_KERNEL
:
347 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
349 case LTTNG_DOMAIN_UST
:
350 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
354 * This case is possible is we try to add the URI to the global tracing
355 * session consumer object which in this case there is no subdir.
357 default_trace_dir
= "";
360 switch (uri
->dtype
) {
363 DBG2("Setting network URI to consumer");
365 /* Set URI into consumer output object */
366 ret
= consumer_set_network_uri(consumer
, uri
);
370 } else if (ret
== 1) {
372 * URI was the same in the consumer so we do not append the subdir
373 * again so to not duplicate output dir.
378 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
379 ret
= consumer_set_subdir(consumer
, session_name
);
386 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
387 /* On a new subdir, reappend the default trace dir. */
388 strncat(consumer
->subdir
, default_trace_dir
,
389 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
390 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
395 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
396 memset(consumer
->dst
.trace_path
, 0,
397 sizeof(consumer
->dst
.trace_path
));
398 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
399 sizeof(consumer
->dst
.trace_path
));
400 /* Append default trace dir */
401 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
402 sizeof(consumer
->dst
.trace_path
) -
403 strlen(consumer
->dst
.trace_path
) - 1);
404 /* Flag consumer as local. */
405 consumer
->type
= CONSUMER_DST_LOCAL
;
414 * Init tracing by creating trace directory and sending fds kernel consumer.
416 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
419 struct lttng_ht_iter iter
;
420 struct consumer_socket
*socket
;
424 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
425 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
427 /* Code flow error */
428 assert(socket
->fd
>= 0);
430 pthread_mutex_lock(socket
->lock
);
431 ret
= kernel_consumer_send_session(socket
->fd
, session
);
432 pthread_mutex_unlock(socket
->lock
);
434 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
445 * Create a socket to the relayd using the URI.
447 * On success, the relayd_sock pointer is set to the created socket.
448 * Else, it's stays untouched and a lttcomm error code is returned.
450 static int create_connect_relayd(struct consumer_output
*output
,
451 const char *session_name
, struct lttng_uri
*uri
,
452 struct lttcomm_sock
**relayd_sock
)
455 struct lttcomm_sock
*sock
;
457 /* Create socket object from URI */
458 sock
= lttcomm_alloc_sock_from_uri(uri
);
464 ret
= lttcomm_create_sock(sock
);
470 /* Connect to relayd so we can proceed with a session creation. */
471 ret
= relayd_connect(sock
);
473 ERR("Unable to reach lttng-relayd");
474 ret
= LTTCOMM_RELAYD_SESSION_FAIL
;
478 /* Create socket for control stream. */
479 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
480 DBG3("Creating relayd stream socket from URI");
482 /* Check relayd version */
483 ret
= relayd_version_check(sock
, RELAYD_VERSION_COMM_MAJOR
,
484 RELAYD_VERSION_COMM_MINOR
);
486 ret
= LTTCOMM_RELAYD_VERSION_FAIL
;
489 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
490 DBG3("Creating relayd data socket from URI");
492 /* Command is not valid */
493 ERR("Relayd invalid stream type: %d", uri
->stype
);
494 ret
= LTTCOMM_INVALID
;
504 (void) relayd_close(sock
);
508 lttcomm_destroy_sock(sock
);
515 * Connect to the relayd using URI and send the socket to the right consumer.
517 static int send_consumer_relayd_socket(int domain
, struct ltt_session
*session
,
518 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
522 struct lttcomm_sock
*sock
= NULL
;
524 /* Set the network sequence index if not set. */
525 if (consumer
->net_seq_index
== -1) {
527 * Increment net_seq_idx because we are about to transfer the
528 * new relayd socket to the consumer.
530 uatomic_inc(&relayd_net_seq_idx
);
531 /* Assign unique key so the consumer can match streams */
532 uatomic_set(&consumer
->net_seq_index
,
533 uatomic_read(&relayd_net_seq_idx
));
536 /* Connect to relayd and make version check if uri is the control. */
537 ret
= create_connect_relayd(consumer
, session
->name
, relayd_uri
, &sock
);
538 if (ret
!= LTTCOMM_OK
) {
542 /* If the control socket is connected, network session is ready */
543 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
544 session
->net_handle
= 1;
547 /* Send relayd socket to consumer. */
548 ret
= consumer_send_relayd_socket(consumer_fd
, sock
,
549 consumer
, relayd_uri
->stype
);
551 ret
= LTTCOMM_ENABLE_CONSUMER_FAIL
;
558 * Close socket which was dup on the consumer side. The session daemon does
559 * NOT keep track of the relayd socket(s) once transfer to the consumer.
564 (void) relayd_close(sock
);
565 lttcomm_destroy_sock(sock
);
572 * Send both relayd sockets to a specific consumer and domain. This is a
573 * helper function to facilitate sending the information to the consumer for a
576 static int send_consumer_relayd_sockets(int domain
,
577 struct ltt_session
*session
, struct consumer_output
*consumer
, int fd
)
584 /* Don't resend the sockets to the consumer. */
585 if (consumer
->dst
.net
.relayd_socks_sent
) {
590 /* Sending control relayd socket. */
591 ret
= send_consumer_relayd_socket(domain
, session
,
592 &consumer
->dst
.net
.control
, consumer
, fd
);
593 if (ret
!= LTTCOMM_OK
) {
597 /* Sending data relayd socket. */
598 ret
= send_consumer_relayd_socket(domain
, session
,
599 &consumer
->dst
.net
.data
, consumer
, fd
);
600 if (ret
!= LTTCOMM_OK
) {
604 /* Flag that all relayd sockets were sent to the consumer. */
605 consumer
->dst
.net
.relayd_socks_sent
= 1;
612 * Setup relayd connections for a tracing session. First creates the socket to
613 * the relayd and send them to the right domain consumer. Consumer type MUST be
616 static int setup_relayd(struct ltt_session
*session
)
618 int ret
= LTTCOMM_OK
;
619 struct ltt_ust_session
*usess
;
620 struct ltt_kernel_session
*ksess
;
621 struct consumer_socket
*socket
;
622 struct lttng_ht_iter iter
;
626 usess
= session
->ust_session
;
627 ksess
= session
->kernel_session
;
629 DBG2("Setting relayd for session %s", session
->name
);
631 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
632 && usess
->consumer
->enabled
) {
633 /* For each consumer socket, send relayd sockets */
634 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
636 /* Code flow error */
637 assert(socket
->fd
>= 0);
639 pthread_mutex_lock(socket
->lock
);
640 send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
,
641 usess
->consumer
, socket
->fd
);
642 pthread_mutex_unlock(socket
->lock
);
643 if (ret
!= LTTCOMM_OK
) {
649 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
650 && ksess
->consumer
->enabled
) {
651 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
653 /* Code flow error */
654 assert(socket
->fd
>= 0);
656 pthread_mutex_lock(socket
->lock
);
657 send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
,
658 ksess
->consumer
, socket
->fd
);
659 pthread_mutex_unlock(socket
->lock
);
660 if (ret
!= LTTCOMM_OK
) {
671 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
673 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
677 struct ltt_ust_session
*usess
;
679 usess
= session
->ust_session
;
682 case LTTNG_DOMAIN_KERNEL
:
684 ret
= channel_kernel_disable(session
->kernel_session
,
686 if (ret
!= LTTCOMM_OK
) {
690 kernel_wait_quiescent(kernel_tracer_fd
);
693 case LTTNG_DOMAIN_UST
:
695 struct ltt_ust_channel
*uchan
;
696 struct lttng_ht
*chan_ht
;
698 chan_ht
= usess
->domain_global
.channels
;
700 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
702 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
706 ret
= channel_ust_disable(usess
, domain
, uchan
);
707 if (ret
!= LTTCOMM_OK
) {
713 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
714 case LTTNG_DOMAIN_UST_EXEC_NAME
:
715 case LTTNG_DOMAIN_UST_PID
:
718 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
729 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
731 * The wpipe arguments is used as a notifier for the kernel thread.
733 int cmd_enable_channel(struct ltt_session
*session
,
734 int domain
, struct lttng_channel
*attr
, int wpipe
)
737 struct ltt_ust_session
*usess
= session
->ust_session
;
738 struct lttng_ht
*chan_ht
;
743 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
746 case LTTNG_DOMAIN_KERNEL
:
748 struct ltt_kernel_channel
*kchan
;
750 /* Mandatory for a kernel channel. */
753 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
754 session
->kernel_session
);
756 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
758 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
761 if (ret
!= LTTCOMM_OK
) {
765 kernel_wait_quiescent(kernel_tracer_fd
);
768 case LTTNG_DOMAIN_UST
:
770 struct ltt_ust_channel
*uchan
;
772 chan_ht
= usess
->domain_global
.channels
;
774 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
776 ret
= channel_ust_create(usess
, domain
, attr
);
778 ret
= channel_ust_enable(usess
, domain
, uchan
);
783 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
784 case LTTNG_DOMAIN_UST_EXEC_NAME
:
785 case LTTNG_DOMAIN_UST_PID
:
788 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
798 * Command LTTNG_DISABLE_EVENT processed by the client thread.
800 int cmd_disable_event(struct ltt_session
*session
, int domain
,
801 char *channel_name
, char *event_name
)
806 case LTTNG_DOMAIN_KERNEL
:
808 struct ltt_kernel_channel
*kchan
;
809 struct ltt_kernel_session
*ksess
;
811 ksess
= session
->kernel_session
;
813 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
815 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
819 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
820 if (ret
!= LTTCOMM_OK
) {
824 kernel_wait_quiescent(kernel_tracer_fd
);
827 case LTTNG_DOMAIN_UST
:
829 struct ltt_ust_channel
*uchan
;
830 struct ltt_ust_session
*usess
;
832 usess
= session
->ust_session
;
834 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
837 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
841 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
842 if (ret
!= LTTCOMM_OK
) {
846 DBG3("Disable UST event %s in channel %s completed", event_name
,
851 case LTTNG_DOMAIN_UST_EXEC_NAME
:
852 case LTTNG_DOMAIN_UST_PID
:
853 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
867 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
869 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
875 case LTTNG_DOMAIN_KERNEL
:
877 struct ltt_kernel_session
*ksess
;
878 struct ltt_kernel_channel
*kchan
;
880 ksess
= session
->kernel_session
;
882 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
884 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
888 ret
= event_kernel_disable_all(ksess
, kchan
);
889 if (ret
!= LTTCOMM_OK
) {
893 kernel_wait_quiescent(kernel_tracer_fd
);
896 case LTTNG_DOMAIN_UST
:
898 struct ltt_ust_session
*usess
;
899 struct ltt_ust_channel
*uchan
;
901 usess
= session
->ust_session
;
903 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
906 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
910 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
915 DBG3("Disable all UST events in channel %s completed", channel_name
);
920 case LTTNG_DOMAIN_UST_EXEC_NAME
:
921 case LTTNG_DOMAIN_UST_PID
:
922 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
936 * Command LTTNG_ADD_CONTEXT processed by the client thread.
938 int cmd_add_context(struct ltt_session
*session
, int domain
,
939 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
944 case LTTNG_DOMAIN_KERNEL
:
945 /* Add kernel context to kernel tracer */
946 ret
= context_kernel_add(session
->kernel_session
, ctx
,
947 event_name
, channel_name
);
948 if (ret
!= LTTCOMM_OK
) {
952 case LTTNG_DOMAIN_UST
:
954 struct ltt_ust_session
*usess
= session
->ust_session
;
958 ret
= context_ust_add(usess
, domain
, ctx
, event_name
, channel_name
);
959 if (ret
!= LTTCOMM_OK
) {
965 case LTTNG_DOMAIN_UST_EXEC_NAME
:
966 case LTTNG_DOMAIN_UST_PID
:
967 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
981 * Command LTTNG_SET_FILTER processed by the client thread.
983 int cmd_set_filter(struct ltt_session
*session
, int domain
,
984 char *channel_name
, char *event_name
,
985 struct lttng_filter_bytecode
*bytecode
)
990 case LTTNG_DOMAIN_KERNEL
:
993 case LTTNG_DOMAIN_UST
:
995 struct ltt_ust_session
*usess
= session
->ust_session
;
997 ret
= filter_ust_set(usess
, domain
, bytecode
, event_name
, channel_name
);
998 if (ret
!= LTTCOMM_OK
) {
1004 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1005 case LTTNG_DOMAIN_UST_PID
:
1006 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1022 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1024 int cmd_enable_event(struct ltt_session
*session
, int domain
,
1025 char *channel_name
, struct lttng_event
*event
, int wpipe
)
1028 struct lttng_channel
*attr
;
1032 assert(channel_name
);
1035 case LTTNG_DOMAIN_KERNEL
:
1037 struct ltt_kernel_channel
*kchan
;
1039 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1040 session
->kernel_session
);
1041 if (kchan
== NULL
) {
1042 attr
= channel_new_default_attr(domain
);
1044 ret
= LTTCOMM_FATAL
;
1047 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1049 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1050 if (ret
!= LTTCOMM_OK
) {
1057 /* Get the newly created kernel channel pointer */
1058 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1059 session
->kernel_session
);
1060 if (kchan
== NULL
) {
1061 /* This sould not happen... */
1062 ret
= LTTCOMM_FATAL
;
1066 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
1068 if (ret
!= LTTCOMM_OK
) {
1072 kernel_wait_quiescent(kernel_tracer_fd
);
1075 case LTTNG_DOMAIN_UST
:
1077 struct ltt_ust_channel
*uchan
;
1078 struct ltt_ust_session
*usess
= session
->ust_session
;
1082 /* Get channel from global UST domain */
1083 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1085 if (uchan
== NULL
) {
1086 /* Create default channel */
1087 attr
= channel_new_default_attr(domain
);
1089 ret
= LTTCOMM_FATAL
;
1092 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1094 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1095 if (ret
!= LTTCOMM_OK
) {
1101 /* Get the newly created channel reference back */
1102 uchan
= trace_ust_find_channel_by_name(
1103 usess
->domain_global
.channels
, channel_name
);
1107 /* At this point, the session and channel exist on the tracer */
1108 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
);
1109 if (ret
!= LTTCOMM_OK
) {
1115 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1116 case LTTNG_DOMAIN_UST_PID
:
1117 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1131 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1133 int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
1134 char *channel_name
, int event_type
, int wpipe
)
1137 struct lttng_channel
*attr
;
1140 assert(channel_name
);
1143 case LTTNG_DOMAIN_KERNEL
:
1145 struct ltt_kernel_channel
*kchan
;
1147 assert(session
->kernel_session
);
1149 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1150 session
->kernel_session
);
1151 if (kchan
== NULL
) {
1152 /* Create default channel */
1153 attr
= channel_new_default_attr(domain
);
1155 ret
= LTTCOMM_FATAL
;
1158 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1160 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1161 if (ret
!= LTTCOMM_OK
) {
1167 /* Get the newly created kernel channel pointer */
1168 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1169 session
->kernel_session
);
1173 switch (event_type
) {
1174 case LTTNG_EVENT_SYSCALL
:
1175 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
1176 kchan
, kernel_tracer_fd
);
1178 case LTTNG_EVENT_TRACEPOINT
:
1180 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1181 * events already registered to the channel.
1183 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
1184 kchan
, kernel_tracer_fd
);
1186 case LTTNG_EVENT_ALL
:
1187 /* Enable syscalls and tracepoints */
1188 ret
= event_kernel_enable_all(session
->kernel_session
,
1189 kchan
, kernel_tracer_fd
);
1192 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
1196 /* Manage return value */
1197 if (ret
!= LTTCOMM_OK
) {
1201 kernel_wait_quiescent(kernel_tracer_fd
);
1204 case LTTNG_DOMAIN_UST
:
1206 struct ltt_ust_channel
*uchan
;
1207 struct ltt_ust_session
*usess
= session
->ust_session
;
1211 /* Get channel from global UST domain */
1212 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1214 if (uchan
== NULL
) {
1215 /* Create default channel */
1216 attr
= channel_new_default_attr(domain
);
1218 ret
= LTTCOMM_FATAL
;
1221 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1223 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1224 if (ret
!= LTTCOMM_OK
) {
1230 /* Get the newly created channel reference back */
1231 uchan
= trace_ust_find_channel_by_name(
1232 usess
->domain_global
.channels
, channel_name
);
1236 /* At this point, the session and channel exist on the tracer */
1238 switch (event_type
) {
1239 case LTTNG_EVENT_ALL
:
1240 case LTTNG_EVENT_TRACEPOINT
:
1241 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
);
1242 if (ret
!= LTTCOMM_OK
) {
1247 ret
= LTTCOMM_UST_ENABLE_FAIL
;
1251 /* Manage return value */
1252 if (ret
!= LTTCOMM_OK
) {
1259 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1260 case LTTNG_DOMAIN_UST_PID
:
1261 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1276 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1278 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1281 ssize_t nb_events
= 0;
1284 case LTTNG_DOMAIN_KERNEL
:
1285 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1286 if (nb_events
< 0) {
1287 ret
= LTTCOMM_KERN_LIST_FAIL
;
1291 case LTTNG_DOMAIN_UST
:
1292 nb_events
= ust_app_list_events(events
);
1293 if (nb_events
< 0) {
1294 ret
= LTTCOMM_UST_LIST_FAIL
;
1306 /* Return negative value to differentiate return code */
1311 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1313 ssize_t
cmd_list_tracepoint_fields(int domain
,
1314 struct lttng_event_field
**fields
)
1317 ssize_t nb_fields
= 0;
1320 case LTTNG_DOMAIN_UST
:
1321 nb_fields
= ust_app_list_event_fields(fields
);
1322 if (nb_fields
< 0) {
1323 ret
= LTTCOMM_UST_LIST_FAIL
;
1327 case LTTNG_DOMAIN_KERNEL
:
1328 default: /* fall-through */
1336 /* Return negative value to differentiate return code */
1341 * Command LTTNG_START_TRACE processed by the client thread.
1343 int cmd_start_trace(struct ltt_session
*session
)
1346 struct ltt_kernel_session
*ksession
;
1347 struct ltt_ust_session
*usess
;
1348 struct ltt_kernel_channel
*kchan
;
1352 /* Ease our life a bit ;) */
1353 ksession
= session
->kernel_session
;
1354 usess
= session
->ust_session
;
1356 if (session
->enabled
) {
1357 /* Already started. */
1358 ret
= LTTCOMM_TRACE_ALREADY_STARTED
;
1362 session
->enabled
= 1;
1364 ret
= setup_relayd(session
);
1365 if (ret
!= LTTCOMM_OK
) {
1366 ERR("Error setting up relayd for session %s", session
->name
);
1370 /* Kernel tracing */
1371 if (ksession
!= NULL
) {
1372 /* Open kernel metadata */
1373 if (ksession
->metadata
== NULL
) {
1374 ret
= kernel_open_metadata(ksession
);
1376 ret
= LTTCOMM_KERN_META_FAIL
;
1381 /* Open kernel metadata stream */
1382 if (ksession
->metadata_stream_fd
< 0) {
1383 ret
= kernel_open_metadata_stream(ksession
);
1385 ERR("Kernel create metadata stream failed");
1386 ret
= LTTCOMM_KERN_STREAM_FAIL
;
1391 /* For each channel */
1392 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1393 if (kchan
->stream_count
== 0) {
1394 ret
= kernel_open_channel_stream(kchan
);
1396 ret
= LTTCOMM_KERN_STREAM_FAIL
;
1399 /* Update the stream global counter */
1400 ksession
->stream_count_global
+= ret
;
1404 /* Setup kernel consumer socket and send fds to it */
1405 ret
= init_kernel_tracing(ksession
);
1407 ret
= LTTCOMM_KERN_START_FAIL
;
1411 /* This start the kernel tracing */
1412 ret
= kernel_start_session(ksession
);
1414 ret
= LTTCOMM_KERN_START_FAIL
;
1418 /* Quiescent wait after starting trace */
1419 kernel_wait_quiescent(kernel_tracer_fd
);
1422 /* Flag session that trace should start automatically */
1424 usess
->start_trace
= 1;
1426 ret
= ust_app_start_trace_all(usess
);
1428 ret
= LTTCOMM_UST_START_FAIL
;
1440 * Command LTTNG_STOP_TRACE processed by the client thread.
1442 int cmd_stop_trace(struct ltt_session
*session
)
1445 struct ltt_kernel_channel
*kchan
;
1446 struct ltt_kernel_session
*ksession
;
1447 struct ltt_ust_session
*usess
;
1452 ksession
= session
->kernel_session
;
1453 usess
= session
->ust_session
;
1455 if (!session
->enabled
) {
1456 ret
= LTTCOMM_TRACE_ALREADY_STOPPED
;
1460 session
->enabled
= 0;
1464 DBG("Stop kernel tracing");
1466 /* Flush metadata if exist */
1467 if (ksession
->metadata_stream_fd
>= 0) {
1468 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1470 ERR("Kernel metadata flush failed");
1474 /* Flush all buffers before stopping */
1475 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1476 ret
= kernel_flush_buffer(kchan
);
1478 ERR("Kernel flush buffer error");
1482 ret
= kernel_stop_session(ksession
);
1484 ret
= LTTCOMM_KERN_STOP_FAIL
;
1488 kernel_wait_quiescent(kernel_tracer_fd
);
1492 usess
->start_trace
= 0;
1494 ret
= ust_app_stop_trace_all(usess
);
1496 ret
= LTTCOMM_UST_STOP_FAIL
;
1508 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1510 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1511 size_t nb_uri
, struct lttng_uri
*uris
)
1514 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1515 struct ltt_ust_session
*usess
= session
->ust_session
;
1516 struct consumer_output
*consumer
= NULL
;
1522 /* Can't enable consumer after session started. */
1523 if (session
->enabled
) {
1524 ret
= LTTCOMM_TRACE_ALREADY_STARTED
;
1528 if (!session
->start_consumer
) {
1529 ret
= LTTCOMM_NO_CONSUMER
;
1534 * This case switch makes sure the domain session has a temporary consumer
1535 * so the URL can be set.
1539 /* Code flow error. A session MUST always have a consumer object */
1540 assert(session
->consumer
);
1542 * The URL will be added to the tracing session consumer instead of a
1543 * specific domain consumer.
1545 consumer
= session
->consumer
;
1547 case LTTNG_DOMAIN_KERNEL
:
1548 /* Code flow error if we don't have a kernel session here. */
1551 /* Create consumer output if none exists */
1552 consumer
= ksess
->tmp_consumer
;
1553 if (consumer
== NULL
) {
1554 consumer
= consumer_copy_output(ksess
->consumer
);
1555 if (consumer
== NULL
) {
1556 ret
= LTTCOMM_FATAL
;
1559 /* Trash the consumer subdir, we are about to set a new one. */
1560 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1561 ksess
->tmp_consumer
= consumer
;
1565 case LTTNG_DOMAIN_UST
:
1566 /* Code flow error if we don't have a kernel session here. */
1569 /* Create consumer output if none exists */
1570 consumer
= usess
->tmp_consumer
;
1571 if (consumer
== NULL
) {
1572 consumer
= consumer_copy_output(usess
->consumer
);
1573 if (consumer
== NULL
) {
1574 ret
= LTTCOMM_FATAL
;
1577 /* Trash the consumer subdir, we are about to set a new one. */
1578 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1579 usess
->tmp_consumer
= consumer
;
1585 for (i
= 0; i
< nb_uri
; i
++) {
1586 struct consumer_socket
*socket
;
1587 struct lttng_ht_iter iter
;
1589 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1595 * Don't send relayd socket if URI is NOT remote or if the relayd
1596 * sockets for the session are already sent.
1598 if (uris
[i
].dtype
== LTTNG_DST_PATH
||
1599 consumer
->dst
.net
.relayd_socks_sent
) {
1603 /* Try to send relayd URI to the consumer if exist. */
1605 cds_lfht_for_each_entry(consumer
->socks
->ht
, &iter
.iter
,
1606 socket
, node
.node
) {
1608 /* A socket in the HT should never have a negative fd */
1609 assert(socket
->fd
>= 0);
1611 pthread_mutex_lock(socket
->lock
);
1612 ret
= send_consumer_relayd_socket(domain
, session
, &uris
[i
],
1613 consumer
, socket
->fd
);
1614 pthread_mutex_unlock(socket
->lock
);
1615 if (ret
!= LTTCOMM_OK
) {
1631 * Command LTTNG_CREATE_SESSION processed by the client thread.
1633 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1634 size_t nb_uri
, lttng_sock_cred
*creds
)
1638 struct ltt_session
*session
;
1643 * Verify if the session already exist
1645 * XXX: There is no need for the session lock list here since the caller
1646 * (process_client_msg) is holding it. We might want to change that so a
1647 * single command does not lock the entire session list.
1649 session
= session_find_by_name(name
);
1650 if (session
!= NULL
) {
1651 ret
= LTTCOMM_EXIST_SESS
;
1655 /* Create tracing session in the registry */
1656 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
1657 LTTNG_SOCK_GET_GID_CRED(creds
));
1658 if (ret
!= LTTCOMM_OK
) {
1663 * Get the newly created session pointer back
1665 * XXX: There is no need for the session lock list here since the caller
1666 * (process_client_msg) is holding it. We might want to change that so a
1667 * single command does not lock the entire session list.
1669 session
= session_find_by_name(name
);
1672 /* Create default consumer output for the session not yet created. */
1673 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1674 if (session
->consumer
== NULL
) {
1675 ret
= LTTCOMM_FATAL
;
1676 goto consumer_error
;
1680 * This means that the lttng_create_session call was called with the _path_
1681 * argument set to NULL.
1685 * At this point, we'll skip the consumer URI setup and create a
1686 * session with a NULL path which will flag the session to NOT spawn a
1689 DBG("Create session %s with NO uri, skipping consumer setup", name
);
1693 session
->start_consumer
= 1;
1695 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1696 if (ret
!= LTTCOMM_OK
) {
1697 goto consumer_error
;
1700 session
->consumer
->enabled
= 1;
1706 session_destroy(session
);
1713 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1715 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1718 struct ltt_ust_session
*usess
;
1719 struct ltt_kernel_session
*ksess
;
1724 usess
= session
->ust_session
;
1725 ksess
= session
->kernel_session
;
1727 /* Clean kernel session teardown */
1728 kernel_destroy_session(ksess
);
1730 /* UST session teardown */
1732 /* Close any relayd session */
1733 consumer_output_send_destroy_relayd(usess
->consumer
);
1735 /* Destroy every UST application related to this session. */
1736 ret
= ust_app_destroy_trace_all(usess
);
1738 ERR("Error in ust_app_destroy_trace_all");
1741 /* Clean up the rest. */
1742 trace_ust_destroy_session(usess
);
1746 * Must notify the kernel thread here to update it's poll set in order to
1747 * remove the channel(s)' fd just destroyed.
1749 ret
= notify_thread_pipe(wpipe
);
1751 PERROR("write kernel poll pipe");
1754 ret
= session_destroy(session
);
1760 * Command LTTNG_CALIBRATE processed by the client thread.
1762 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1767 case LTTNG_DOMAIN_KERNEL
:
1769 struct lttng_kernel_calibrate kcalibrate
;
1771 kcalibrate
.type
= calibrate
->type
;
1772 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1774 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
1779 case LTTNG_DOMAIN_UST
:
1781 struct lttng_ust_calibrate ucalibrate
;
1783 ucalibrate
.type
= calibrate
->type
;
1784 ret
= ust_app_calibrate_glb(&ucalibrate
);
1786 ret
= LTTCOMM_UST_CALIBRATE_FAIL
;
1803 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1805 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1806 const char *sock_path
, struct consumer_data
*cdata
)
1809 struct consumer_socket
*socket
;
1816 case LTTNG_DOMAIN_KERNEL
:
1818 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1822 /* Can't register a consumer if there is already one */
1823 if (ksess
->consumer_fds_sent
!= 0) {
1824 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1828 sock
= lttcomm_connect_unix_sock(sock_path
);
1830 ret
= LTTCOMM_CONNECT_FAIL
;
1834 socket
= consumer_allocate_socket(sock
);
1835 if (socket
== NULL
) {
1836 ret
= LTTCOMM_FATAL
;
1841 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1842 if (socket
->lock
== NULL
) {
1843 PERROR("zmalloc pthread mutex");
1844 ret
= LTTCOMM_FATAL
;
1847 pthread_mutex_init(socket
->lock
, NULL
);
1848 socket
->registered
= 1;
1851 consumer_add_socket(socket
, ksess
->consumer
);
1854 pthread_mutex_lock(&cdata
->pid_mutex
);
1856 pthread_mutex_unlock(&cdata
->pid_mutex
);
1861 /* TODO: Userspace tracing */
1873 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1875 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1876 struct lttng_domain
**domains
)
1881 if (session
->kernel_session
!= NULL
) {
1882 DBG3("Listing domains found kernel domain");
1886 if (session
->ust_session
!= NULL
) {
1887 DBG3("Listing domains found UST global domain");
1891 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1892 if (*domains
== NULL
) {
1893 ret
= -LTTCOMM_FATAL
;
1897 if (session
->kernel_session
!= NULL
) {
1898 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1902 if (session
->ust_session
!= NULL
) {
1903 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1915 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1917 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1918 struct lttng_channel
**channels
)
1921 ssize_t nb_chan
= 0;
1924 case LTTNG_DOMAIN_KERNEL
:
1925 if (session
->kernel_session
!= NULL
) {
1926 nb_chan
= session
->kernel_session
->channel_count
;
1928 DBG3("Number of kernel channels %zd", nb_chan
);
1930 case LTTNG_DOMAIN_UST
:
1931 if (session
->ust_session
!= NULL
) {
1932 nb_chan
= lttng_ht_get_count(
1933 session
->ust_session
->domain_global
.channels
);
1935 DBG3("Number of UST global channels %zd", nb_chan
);
1944 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
1945 if (*channels
== NULL
) {
1946 ret
= -LTTCOMM_FATAL
;
1950 list_lttng_channels(domain
, session
, *channels
);
1962 * Command LTTNG_LIST_EVENTS processed by the client thread.
1964 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
1965 char *channel_name
, struct lttng_event
**events
)
1968 ssize_t nb_event
= 0;
1971 case LTTNG_DOMAIN_KERNEL
:
1972 if (session
->kernel_session
!= NULL
) {
1973 nb_event
= list_lttng_kernel_events(channel_name
,
1974 session
->kernel_session
, events
);
1977 case LTTNG_DOMAIN_UST
:
1979 if (session
->ust_session
!= NULL
) {
1980 nb_event
= list_lttng_ust_global_events(channel_name
,
1981 &session
->ust_session
->domain_global
, events
);
1997 * Using the session list, filled a lttng_session array to send back to the
1998 * client for session listing.
2000 * The session list lock MUST be acquired before calling this function. Use
2001 * session_lock_list() and session_unlock_list().
2003 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2008 struct ltt_session
*session
;
2009 struct ltt_session_list
*list
= session_get_list();
2011 DBG("Getting all available session for UID %d GID %d",
2014 * Iterate over session list and append data after the control struct in
2017 cds_list_for_each_entry(session
, &list
->head
, list
) {
2019 * Only list the sessions the user can control.
2021 if (!session_access_ok(session
, uid
, gid
)) {
2025 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2026 struct ltt_ust_session
*usess
= session
->ust_session
;
2028 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2029 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2030 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2031 ret
= build_network_session_path(sessions
[i
].path
,
2032 sizeof(session
[i
].path
), session
);
2034 ret
= snprintf(sessions
[i
].path
, sizeof(session
[i
].path
), "%s",
2035 session
->consumer
->dst
.trace_path
);
2038 PERROR("snprintf session path");
2042 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2043 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2044 sessions
[i
].enabled
= session
->enabled
;
2050 * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
2052 int cmd_disable_consumer(int domain
, struct ltt_session
*session
)
2055 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2056 struct ltt_ust_session
*usess
= session
->ust_session
;
2057 struct consumer_output
*consumer
;
2061 if (session
->enabled
) {
2062 /* Can't disable consumer on an already started session */
2063 ret
= LTTCOMM_TRACE_ALREADY_STARTED
;
2067 if (!session
->start_consumer
) {
2068 ret
= LTTCOMM_NO_CONSUMER
;
2074 DBG("Disable tracing session %s consumer", session
->name
);
2075 consumer
= session
->consumer
;
2077 case LTTNG_DOMAIN_KERNEL
:
2078 /* Code flow error if we don't have a kernel session here. */
2081 DBG("Disabling kernel consumer");
2082 consumer
= ksess
->consumer
;
2085 case LTTNG_DOMAIN_UST
:
2086 /* Code flow error if we don't have a UST session here. */
2089 DBG("Disabling UST consumer");
2090 consumer
= usess
->consumer
;
2094 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2099 consumer
->enabled
= 0;
2100 /* Success at this point */
2103 ret
= LTTCOMM_NO_CONSUMER
;
2111 * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
2113 int cmd_enable_consumer(int domain
, struct ltt_session
*session
)
2116 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2117 struct ltt_ust_session
*usess
= session
->ust_session
;
2118 struct consumer_output
*consumer
= NULL
;
2122 /* Can't enable consumer after session started. */
2123 if (session
->enabled
) {
2124 ret
= LTTCOMM_TRACE_ALREADY_STARTED
;
2128 if (!session
->start_consumer
) {
2129 ret
= LTTCOMM_NO_CONSUMER
;
2135 assert(session
->consumer
);
2136 consumer
= session
->consumer
;
2138 case LTTNG_DOMAIN_KERNEL
:
2139 /* Code flow error if we don't have a kernel session here. */
2143 * Check if we have already sent fds to the consumer. In that case,
2144 * the enable-consumer command can't be used because a start trace
2145 * had previously occured.
2147 if (ksess
->consumer_fds_sent
) {
2148 ret
= LTTCOMM_ENABLE_CONSUMER_FAIL
;
2152 consumer
= ksess
->tmp_consumer
;
2153 if (consumer
== NULL
) {
2155 /* No temp. consumer output exists. Using the current one. */
2156 DBG3("No temporary consumer. Using default");
2157 consumer
= ksess
->consumer
;
2161 switch (consumer
->type
) {
2162 case CONSUMER_DST_LOCAL
:
2163 DBG2("Consumer output is local. Creating directory(ies)");
2165 /* Create directory(ies) */
2166 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2167 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2169 if (ret
!= -EEXIST
) {
2170 ERR("Trace directory creation error");
2171 ret
= LTTCOMM_FATAL
;
2176 case CONSUMER_DST_NET
:
2177 DBG2("Consumer output is network. Validating URIs");
2178 /* Validate if we have both control and data path set. */
2179 if (!consumer
->dst
.net
.control_isset
) {
2180 ret
= LTTCOMM_URL_CTRL_MISS
;
2184 if (!consumer
->dst
.net
.data_isset
) {
2185 ret
= LTTCOMM_URL_DATA_MISS
;
2189 /* Check established network session state */
2190 if (session
->net_handle
== 0) {
2191 ret
= LTTCOMM_ENABLE_CONSUMER_FAIL
;
2192 ERR("Session network handle is not set on enable-consumer");
2199 /* Append default kernel trace dir to subdir */
2200 strncat(ksess
->consumer
->subdir
, DEFAULT_KERNEL_TRACE_DIR
,
2201 sizeof(ksess
->consumer
->subdir
) -
2202 strlen(ksess
->consumer
->subdir
) - 1);
2206 * This is race free for now since the session lock is acquired before
2207 * ending up in this function. No other threads can access this kernel
2208 * session without this lock hence freeing the consumer output object
2212 consumer_destroy_output(ksess
->consumer
);
2214 ksess
->consumer
= consumer
;
2215 ksess
->tmp_consumer
= NULL
;
2218 case LTTNG_DOMAIN_UST
:
2219 /* Code flow error if we don't have a UST session here. */
2223 * Check if we have already sent fds to the consumer. In that case,
2224 * the enable-consumer command can't be used because a start trace
2225 * had previously occured.
2227 if (usess
->start_trace
) {
2228 ret
= LTTCOMM_ENABLE_CONSUMER_FAIL
;
2232 consumer
= usess
->tmp_consumer
;
2233 if (consumer
== NULL
) {
2235 /* No temp. consumer output exists. Using the current one. */
2236 DBG3("No temporary consumer. Using default");
2237 consumer
= usess
->consumer
;
2241 switch (consumer
->type
) {
2242 case CONSUMER_DST_LOCAL
:
2243 DBG2("Consumer output is local. Creating directory(ies)");
2245 /* Create directory(ies) */
2246 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2247 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2249 if (ret
!= -EEXIST
) {
2250 ERR("Trace directory creation error");
2251 ret
= LTTCOMM_FATAL
;
2256 case CONSUMER_DST_NET
:
2257 DBG2("Consumer output is network. Validating URIs");
2258 /* Validate if we have both control and data path set. */
2259 if (!consumer
->dst
.net
.control_isset
) {
2260 ret
= LTTCOMM_URL_CTRL_MISS
;
2264 if (!consumer
->dst
.net
.data_isset
) {
2265 ret
= LTTCOMM_URL_DATA_MISS
;
2269 /* Check established network session state */
2270 if (session
->net_handle
== 0) {
2271 ret
= LTTCOMM_ENABLE_CONSUMER_FAIL
;
2272 DBG2("Session network handle is not set on enable-consumer");
2276 if (consumer
->net_seq_index
== -1) {
2277 ret
= LTTCOMM_ENABLE_CONSUMER_FAIL
;
2278 DBG2("Network index is not set on the consumer");
2285 /* Append default kernel trace dir to subdir */
2286 strncat(usess
->consumer
->subdir
, DEFAULT_UST_TRACE_DIR
,
2287 sizeof(usess
->consumer
->subdir
) -
2288 strlen(usess
->consumer
->subdir
) - 1);
2292 * This is race free for now since the session lock is acquired before
2293 * ending up in this function. No other threads can access this kernel
2294 * session without this lock hence freeing the consumer output object
2298 consumer_destroy_output(usess
->consumer
);
2300 usess
->consumer
= consumer
;
2301 usess
->tmp_consumer
= NULL
;
2308 consumer
->enabled
= 1;
2309 /* Success at this point */
2312 /* Should not really happend... */
2313 ret
= LTTCOMM_NO_CONSUMER
;
2321 * Init command subsystem.
2326 * Set network sequence index to 1 for streams to match a relayd socket on
2327 * the consumer side.
2329 uatomic_set(&relayd_net_seq_idx
, 1);
2331 DBG("Command subsystem initialized");