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
, sizeof(consumer
->subdir
));
389 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
394 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
395 memset(consumer
->dst
.trace_path
, 0,
396 sizeof(consumer
->dst
.trace_path
));
397 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
398 sizeof(consumer
->dst
.trace_path
));
399 /* Append default trace dir */
400 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
401 sizeof(consumer
->dst
.trace_path
));
402 /* Flag consumer as local. */
403 consumer
->type
= CONSUMER_DST_LOCAL
;
412 * Init tracing by creating trace directory and sending fds kernel consumer.
414 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
417 struct lttng_ht_iter iter
;
418 struct consumer_socket
*socket
;
422 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
423 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
425 /* Code flow error */
426 assert(socket
->fd
>= 0);
428 pthread_mutex_lock(socket
->lock
);
429 ret
= kernel_consumer_send_session(socket
->fd
, session
);
430 pthread_mutex_unlock(socket
->lock
);
432 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
443 * Create a socket to the relayd using the URI.
445 * On success, the relayd_sock pointer is set to the created socket.
446 * Else, it's stays untouched and a lttcomm error code is returned.
448 static int create_connect_relayd(struct consumer_output
*output
,
449 const char *session_name
, struct lttng_uri
*uri
,
450 struct lttcomm_sock
**relayd_sock
)
453 struct lttcomm_sock
*sock
;
455 /* Create socket object from URI */
456 sock
= lttcomm_alloc_sock_from_uri(uri
);
462 ret
= lttcomm_create_sock(sock
);
468 /* Connect to relayd so we can proceed with a session creation. */
469 ret
= relayd_connect(sock
);
471 ERR("Unable to reach lttng-relayd");
472 ret
= LTTCOMM_RELAYD_SESSION_FAIL
;
476 /* Create socket for control stream. */
477 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
478 DBG3("Creating relayd stream socket from URI");
480 /* Check relayd version */
481 ret
= relayd_version_check(sock
, RELAYD_VERSION_COMM_MAJOR
,
482 RELAYD_VERSION_COMM_MINOR
);
484 ret
= LTTCOMM_RELAYD_VERSION_FAIL
;
487 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
488 DBG3("Creating relayd data socket from URI");
490 /* Command is not valid */
491 ERR("Relayd invalid stream type: %d", uri
->stype
);
492 ret
= LTTCOMM_INVALID
;
502 (void) relayd_close(sock
);
506 lttcomm_destroy_sock(sock
);
513 * Connect to the relayd using URI and send the socket to the right consumer.
515 static int send_consumer_relayd_socket(int domain
, struct ltt_session
*session
,
516 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
520 struct lttcomm_sock
*sock
= NULL
;
522 /* Set the network sequence index if not set. */
523 if (consumer
->net_seq_index
== -1) {
525 * Increment net_seq_idx because we are about to transfer the
526 * new relayd socket to the consumer.
528 uatomic_inc(&relayd_net_seq_idx
);
529 /* Assign unique key so the consumer can match streams */
530 uatomic_set(&consumer
->net_seq_index
,
531 uatomic_read(&relayd_net_seq_idx
));
534 /* Connect to relayd and make version check if uri is the control. */
535 ret
= create_connect_relayd(consumer
, session
->name
, relayd_uri
, &sock
);
536 if (ret
!= LTTCOMM_OK
) {
540 /* If the control socket is connected, network session is ready */
541 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
542 session
->net_handle
= 1;
545 /* Send relayd socket to consumer. */
546 ret
= consumer_send_relayd_socket(consumer_fd
, sock
,
547 consumer
, relayd_uri
->stype
);
549 ret
= LTTCOMM_ENABLE_CONSUMER_FAIL
;
556 * Close socket which was dup on the consumer side. The session daemon does
557 * NOT keep track of the relayd socket(s) once transfer to the consumer.
562 (void) relayd_close(sock
);
563 lttcomm_destroy_sock(sock
);
570 * Send both relayd sockets to a specific consumer and domain. This is a
571 * helper function to facilitate sending the information to the consumer for a
574 static int send_consumer_relayd_sockets(int domain
,
575 struct ltt_session
*session
, struct consumer_output
*consumer
, int fd
)
582 /* Don't resend the sockets to the consumer. */
583 if (consumer
->dst
.net
.relayd_socks_sent
) {
588 /* Sending control relayd socket. */
589 ret
= send_consumer_relayd_socket(domain
, session
,
590 &consumer
->dst
.net
.control
, consumer
, fd
);
591 if (ret
!= LTTCOMM_OK
) {
595 /* Sending data relayd socket. */
596 ret
= send_consumer_relayd_socket(domain
, session
,
597 &consumer
->dst
.net
.data
, consumer
, fd
);
598 if (ret
!= LTTCOMM_OK
) {
602 /* Flag that all relayd sockets were sent to the consumer. */
603 consumer
->dst
.net
.relayd_socks_sent
= 1;
610 * Setup relayd connections for a tracing session. First creates the socket to
611 * the relayd and send them to the right domain consumer. Consumer type MUST be
614 static int setup_relayd(struct ltt_session
*session
)
616 int ret
= LTTCOMM_OK
;
617 struct ltt_ust_session
*usess
;
618 struct ltt_kernel_session
*ksess
;
619 struct consumer_socket
*socket
;
620 struct lttng_ht_iter iter
;
624 usess
= session
->ust_session
;
625 ksess
= session
->kernel_session
;
627 DBG2("Setting relayd for session %s", session
->name
);
629 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
630 && usess
->consumer
->enabled
) {
631 /* For each consumer socket, send relayd sockets */
632 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
634 /* Code flow error */
635 assert(socket
->fd
>= 0);
637 pthread_mutex_lock(socket
->lock
);
638 send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
,
639 usess
->consumer
, socket
->fd
);
640 pthread_mutex_unlock(socket
->lock
);
641 if (ret
!= LTTCOMM_OK
) {
647 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
648 && ksess
->consumer
->enabled
) {
649 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
651 /* Code flow error */
652 assert(socket
->fd
>= 0);
654 pthread_mutex_lock(socket
->lock
);
655 send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
,
656 ksess
->consumer
, socket
->fd
);
657 pthread_mutex_unlock(socket
->lock
);
658 if (ret
!= LTTCOMM_OK
) {
669 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
671 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
675 struct ltt_ust_session
*usess
;
677 usess
= session
->ust_session
;
680 case LTTNG_DOMAIN_KERNEL
:
682 ret
= channel_kernel_disable(session
->kernel_session
,
684 if (ret
!= LTTCOMM_OK
) {
688 kernel_wait_quiescent(kernel_tracer_fd
);
691 case LTTNG_DOMAIN_UST
:
693 struct ltt_ust_channel
*uchan
;
694 struct lttng_ht
*chan_ht
;
696 chan_ht
= usess
->domain_global
.channels
;
698 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
700 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
704 ret
= channel_ust_disable(usess
, domain
, uchan
);
705 if (ret
!= LTTCOMM_OK
) {
711 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
712 case LTTNG_DOMAIN_UST_EXEC_NAME
:
713 case LTTNG_DOMAIN_UST_PID
:
716 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
727 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
729 * The wpipe arguments is used as a notifier for the kernel thread.
731 int cmd_enable_channel(struct ltt_session
*session
,
732 int domain
, struct lttng_channel
*attr
, int wpipe
)
735 struct ltt_ust_session
*usess
= session
->ust_session
;
736 struct lttng_ht
*chan_ht
;
741 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
744 case LTTNG_DOMAIN_KERNEL
:
746 struct ltt_kernel_channel
*kchan
;
748 /* Mandatory for a kernel channel. */
751 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
752 session
->kernel_session
);
754 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
756 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
759 if (ret
!= LTTCOMM_OK
) {
763 kernel_wait_quiescent(kernel_tracer_fd
);
766 case LTTNG_DOMAIN_UST
:
768 struct ltt_ust_channel
*uchan
;
770 chan_ht
= usess
->domain_global
.channels
;
772 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
774 ret
= channel_ust_create(usess
, domain
, attr
);
776 ret
= channel_ust_enable(usess
, domain
, uchan
);
781 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
782 case LTTNG_DOMAIN_UST_EXEC_NAME
:
783 case LTTNG_DOMAIN_UST_PID
:
786 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
796 * Command LTTNG_DISABLE_EVENT processed by the client thread.
798 int cmd_disable_event(struct ltt_session
*session
, int domain
,
799 char *channel_name
, char *event_name
)
804 case LTTNG_DOMAIN_KERNEL
:
806 struct ltt_kernel_channel
*kchan
;
807 struct ltt_kernel_session
*ksess
;
809 ksess
= session
->kernel_session
;
811 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
813 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
817 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
818 if (ret
!= LTTCOMM_OK
) {
822 kernel_wait_quiescent(kernel_tracer_fd
);
825 case LTTNG_DOMAIN_UST
:
827 struct ltt_ust_channel
*uchan
;
828 struct ltt_ust_session
*usess
;
830 usess
= session
->ust_session
;
832 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
835 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
839 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
840 if (ret
!= LTTCOMM_OK
) {
844 DBG3("Disable UST event %s in channel %s completed", event_name
,
849 case LTTNG_DOMAIN_UST_EXEC_NAME
:
850 case LTTNG_DOMAIN_UST_PID
:
851 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
865 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
867 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
873 case LTTNG_DOMAIN_KERNEL
:
875 struct ltt_kernel_session
*ksess
;
876 struct ltt_kernel_channel
*kchan
;
878 ksess
= session
->kernel_session
;
880 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
882 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
886 ret
= event_kernel_disable_all(ksess
, kchan
);
887 if (ret
!= LTTCOMM_OK
) {
891 kernel_wait_quiescent(kernel_tracer_fd
);
894 case LTTNG_DOMAIN_UST
:
896 struct ltt_ust_session
*usess
;
897 struct ltt_ust_channel
*uchan
;
899 usess
= session
->ust_session
;
901 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
904 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
908 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
913 DBG3("Disable all UST events in channel %s completed", channel_name
);
918 case LTTNG_DOMAIN_UST_EXEC_NAME
:
919 case LTTNG_DOMAIN_UST_PID
:
920 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
934 * Command LTTNG_ADD_CONTEXT processed by the client thread.
936 int cmd_add_context(struct ltt_session
*session
, int domain
,
937 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
942 case LTTNG_DOMAIN_KERNEL
:
943 /* Add kernel context to kernel tracer */
944 ret
= context_kernel_add(session
->kernel_session
, ctx
,
945 event_name
, channel_name
);
946 if (ret
!= LTTCOMM_OK
) {
950 case LTTNG_DOMAIN_UST
:
952 struct ltt_ust_session
*usess
= session
->ust_session
;
956 ret
= context_ust_add(usess
, domain
, ctx
, event_name
, channel_name
);
957 if (ret
!= LTTCOMM_OK
) {
963 case LTTNG_DOMAIN_UST_EXEC_NAME
:
964 case LTTNG_DOMAIN_UST_PID
:
965 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
979 * Command LTTNG_SET_FILTER processed by the client thread.
981 int cmd_set_filter(struct ltt_session
*session
, int domain
,
982 char *channel_name
, char *event_name
,
983 struct lttng_filter_bytecode
*bytecode
)
988 case LTTNG_DOMAIN_KERNEL
:
991 case LTTNG_DOMAIN_UST
:
993 struct ltt_ust_session
*usess
= session
->ust_session
;
995 ret
= filter_ust_set(usess
, domain
, bytecode
, event_name
, channel_name
);
996 if (ret
!= LTTCOMM_OK
) {
1002 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1003 case LTTNG_DOMAIN_UST_PID
:
1004 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1020 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1022 int cmd_enable_event(struct ltt_session
*session
, int domain
,
1023 char *channel_name
, struct lttng_event
*event
, int wpipe
)
1026 struct lttng_channel
*attr
;
1030 assert(channel_name
);
1033 case LTTNG_DOMAIN_KERNEL
:
1035 struct ltt_kernel_channel
*kchan
;
1037 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1038 session
->kernel_session
);
1039 if (kchan
== NULL
) {
1040 attr
= channel_new_default_attr(domain
);
1042 ret
= LTTCOMM_FATAL
;
1045 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1047 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1048 if (ret
!= LTTCOMM_OK
) {
1055 /* Get the newly created kernel channel pointer */
1056 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1057 session
->kernel_session
);
1058 if (kchan
== NULL
) {
1059 /* This sould not happen... */
1060 ret
= LTTCOMM_FATAL
;
1064 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
1066 if (ret
!= LTTCOMM_OK
) {
1070 kernel_wait_quiescent(kernel_tracer_fd
);
1073 case LTTNG_DOMAIN_UST
:
1075 struct ltt_ust_channel
*uchan
;
1076 struct ltt_ust_session
*usess
= session
->ust_session
;
1080 /* Get channel from global UST domain */
1081 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1083 if (uchan
== NULL
) {
1084 /* Create default channel */
1085 attr
= channel_new_default_attr(domain
);
1087 ret
= LTTCOMM_FATAL
;
1090 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1092 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1093 if (ret
!= LTTCOMM_OK
) {
1099 /* Get the newly created channel reference back */
1100 uchan
= trace_ust_find_channel_by_name(
1101 usess
->domain_global
.channels
, channel_name
);
1105 /* At this point, the session and channel exist on the tracer */
1106 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
);
1107 if (ret
!= LTTCOMM_OK
) {
1113 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1114 case LTTNG_DOMAIN_UST_PID
:
1115 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1129 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1131 int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
1132 char *channel_name
, int event_type
, int wpipe
)
1135 struct lttng_channel
*attr
;
1138 assert(channel_name
);
1141 case LTTNG_DOMAIN_KERNEL
:
1143 struct ltt_kernel_channel
*kchan
;
1145 assert(session
->kernel_session
);
1147 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1148 session
->kernel_session
);
1149 if (kchan
== NULL
) {
1150 /* Create default channel */
1151 attr
= channel_new_default_attr(domain
);
1153 ret
= LTTCOMM_FATAL
;
1156 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1158 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1159 if (ret
!= LTTCOMM_OK
) {
1165 /* Get the newly created kernel channel pointer */
1166 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1167 session
->kernel_session
);
1171 switch (event_type
) {
1172 case LTTNG_EVENT_SYSCALL
:
1173 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
1174 kchan
, kernel_tracer_fd
);
1176 case LTTNG_EVENT_TRACEPOINT
:
1178 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1179 * events already registered to the channel.
1181 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
1182 kchan
, kernel_tracer_fd
);
1184 case LTTNG_EVENT_ALL
:
1185 /* Enable syscalls and tracepoints */
1186 ret
= event_kernel_enable_all(session
->kernel_session
,
1187 kchan
, kernel_tracer_fd
);
1190 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
1194 /* Manage return value */
1195 if (ret
!= LTTCOMM_OK
) {
1199 kernel_wait_quiescent(kernel_tracer_fd
);
1202 case LTTNG_DOMAIN_UST
:
1204 struct ltt_ust_channel
*uchan
;
1205 struct ltt_ust_session
*usess
= session
->ust_session
;
1209 /* Get channel from global UST domain */
1210 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1212 if (uchan
== NULL
) {
1213 /* Create default channel */
1214 attr
= channel_new_default_attr(domain
);
1216 ret
= LTTCOMM_FATAL
;
1219 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1221 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1222 if (ret
!= LTTCOMM_OK
) {
1228 /* Get the newly created channel reference back */
1229 uchan
= trace_ust_find_channel_by_name(
1230 usess
->domain_global
.channels
, channel_name
);
1234 /* At this point, the session and channel exist on the tracer */
1236 switch (event_type
) {
1237 case LTTNG_EVENT_ALL
:
1238 case LTTNG_EVENT_TRACEPOINT
:
1239 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
);
1240 if (ret
!= LTTCOMM_OK
) {
1245 ret
= LTTCOMM_UST_ENABLE_FAIL
;
1249 /* Manage return value */
1250 if (ret
!= LTTCOMM_OK
) {
1257 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1258 case LTTNG_DOMAIN_UST_PID
:
1259 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1274 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1276 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1279 ssize_t nb_events
= 0;
1282 case LTTNG_DOMAIN_KERNEL
:
1283 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1284 if (nb_events
< 0) {
1285 ret
= LTTCOMM_KERN_LIST_FAIL
;
1289 case LTTNG_DOMAIN_UST
:
1290 nb_events
= ust_app_list_events(events
);
1291 if (nb_events
< 0) {
1292 ret
= LTTCOMM_UST_LIST_FAIL
;
1304 /* Return negative value to differentiate return code */
1309 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1311 ssize_t
cmd_list_tracepoint_fields(int domain
,
1312 struct lttng_event_field
**fields
)
1315 ssize_t nb_fields
= 0;
1318 case LTTNG_DOMAIN_UST
:
1319 nb_fields
= ust_app_list_event_fields(fields
);
1320 if (nb_fields
< 0) {
1321 ret
= LTTCOMM_UST_LIST_FAIL
;
1325 case LTTNG_DOMAIN_KERNEL
:
1326 default: /* fall-through */
1334 /* Return negative value to differentiate return code */
1339 * Command LTTNG_START_TRACE processed by the client thread.
1341 int cmd_start_trace(struct ltt_session
*session
)
1344 struct ltt_kernel_session
*ksession
;
1345 struct ltt_ust_session
*usess
;
1346 struct ltt_kernel_channel
*kchan
;
1350 /* Ease our life a bit ;) */
1351 ksession
= session
->kernel_session
;
1352 usess
= session
->ust_session
;
1354 if (session
->enabled
) {
1355 /* Already started. */
1356 ret
= LTTCOMM_TRACE_ALREADY_STARTED
;
1360 session
->enabled
= 1;
1362 ret
= setup_relayd(session
);
1363 if (ret
!= LTTCOMM_OK
) {
1364 ERR("Error setting up relayd for session %s", session
->name
);
1368 /* Kernel tracing */
1369 if (ksession
!= NULL
) {
1370 /* Open kernel metadata */
1371 if (ksession
->metadata
== NULL
) {
1372 ret
= kernel_open_metadata(ksession
);
1374 ret
= LTTCOMM_KERN_META_FAIL
;
1379 /* Open kernel metadata stream */
1380 if (ksession
->metadata_stream_fd
< 0) {
1381 ret
= kernel_open_metadata_stream(ksession
);
1383 ERR("Kernel create metadata stream failed");
1384 ret
= LTTCOMM_KERN_STREAM_FAIL
;
1389 /* For each channel */
1390 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1391 if (kchan
->stream_count
== 0) {
1392 ret
= kernel_open_channel_stream(kchan
);
1394 ret
= LTTCOMM_KERN_STREAM_FAIL
;
1397 /* Update the stream global counter */
1398 ksession
->stream_count_global
+= ret
;
1402 /* Setup kernel consumer socket and send fds to it */
1403 ret
= init_kernel_tracing(ksession
);
1405 ret
= LTTCOMM_KERN_START_FAIL
;
1409 /* This start the kernel tracing */
1410 ret
= kernel_start_session(ksession
);
1412 ret
= LTTCOMM_KERN_START_FAIL
;
1416 /* Quiescent wait after starting trace */
1417 kernel_wait_quiescent(kernel_tracer_fd
);
1420 /* Flag session that trace should start automatically */
1422 usess
->start_trace
= 1;
1424 ret
= ust_app_start_trace_all(usess
);
1426 ret
= LTTCOMM_UST_START_FAIL
;
1438 * Command LTTNG_STOP_TRACE processed by the client thread.
1440 int cmd_stop_trace(struct ltt_session
*session
)
1443 struct ltt_kernel_channel
*kchan
;
1444 struct ltt_kernel_session
*ksession
;
1445 struct ltt_ust_session
*usess
;
1450 ksession
= session
->kernel_session
;
1451 usess
= session
->ust_session
;
1453 if (!session
->enabled
) {
1454 ret
= LTTCOMM_TRACE_ALREADY_STOPPED
;
1458 session
->enabled
= 0;
1462 DBG("Stop kernel tracing");
1464 /* Flush metadata if exist */
1465 if (ksession
->metadata_stream_fd
>= 0) {
1466 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1468 ERR("Kernel metadata flush failed");
1472 /* Flush all buffers before stopping */
1473 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1474 ret
= kernel_flush_buffer(kchan
);
1476 ERR("Kernel flush buffer error");
1480 ret
= kernel_stop_session(ksession
);
1482 ret
= LTTCOMM_KERN_STOP_FAIL
;
1486 kernel_wait_quiescent(kernel_tracer_fd
);
1490 usess
->start_trace
= 0;
1492 ret
= ust_app_stop_trace_all(usess
);
1494 ret
= LTTCOMM_UST_STOP_FAIL
;
1506 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1508 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1509 size_t nb_uri
, struct lttng_uri
*uris
)
1512 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1513 struct ltt_ust_session
*usess
= session
->ust_session
;
1514 struct consumer_output
*consumer
= NULL
;
1520 /* Can't enable consumer after session started. */
1521 if (session
->enabled
) {
1522 ret
= LTTCOMM_TRACE_ALREADY_STARTED
;
1526 if (!session
->start_consumer
) {
1527 ret
= LTTCOMM_NO_CONSUMER
;
1532 * This case switch makes sure the domain session has a temporary consumer
1533 * so the URL can be set.
1537 /* Code flow error. A session MUST always have a consumer object */
1538 assert(session
->consumer
);
1540 * The URL will be added to the tracing session consumer instead of a
1541 * specific domain consumer.
1543 consumer
= session
->consumer
;
1545 case LTTNG_DOMAIN_KERNEL
:
1546 /* Code flow error if we don't have a kernel session here. */
1549 /* Create consumer output if none exists */
1550 consumer
= ksess
->tmp_consumer
;
1551 if (consumer
== NULL
) {
1552 consumer
= consumer_copy_output(ksess
->consumer
);
1553 if (consumer
== NULL
) {
1554 ret
= LTTCOMM_FATAL
;
1557 /* Trash the consumer subdir, we are about to set a new one. */
1558 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1559 ksess
->tmp_consumer
= consumer
;
1563 case LTTNG_DOMAIN_UST
:
1564 /* Code flow error if we don't have a kernel session here. */
1567 /* Create consumer output if none exists */
1568 consumer
= usess
->tmp_consumer
;
1569 if (consumer
== NULL
) {
1570 consumer
= consumer_copy_output(usess
->consumer
);
1571 if (consumer
== NULL
) {
1572 ret
= LTTCOMM_FATAL
;
1575 /* Trash the consumer subdir, we are about to set a new one. */
1576 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1577 usess
->tmp_consumer
= consumer
;
1583 for (i
= 0; i
< nb_uri
; i
++) {
1584 struct consumer_socket
*socket
;
1585 struct lttng_ht_iter iter
;
1587 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1593 * Don't send relayd socket if URI is NOT remote or if the relayd
1594 * sockets for the session are already sent.
1596 if (uris
[i
].dtype
== LTTNG_DST_PATH
||
1597 consumer
->dst
.net
.relayd_socks_sent
) {
1601 /* Try to send relayd URI to the consumer if exist. */
1603 cds_lfht_for_each_entry(consumer
->socks
->ht
, &iter
.iter
,
1604 socket
, node
.node
) {
1606 /* A socket in the HT should never have a negative fd */
1607 assert(socket
->fd
>= 0);
1609 pthread_mutex_lock(socket
->lock
);
1610 ret
= send_consumer_relayd_socket(domain
, session
, &uris
[i
],
1611 consumer
, socket
->fd
);
1612 pthread_mutex_unlock(socket
->lock
);
1613 if (ret
!= LTTCOMM_OK
) {
1629 * Command LTTNG_CREATE_SESSION processed by the client thread.
1631 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1632 size_t nb_uri
, lttng_sock_cred
*creds
)
1636 struct ltt_session
*session
;
1641 * Verify if the session already exist
1643 * XXX: There is no need for the session lock list here since the caller
1644 * (process_client_msg) is holding it. We might want to change that so a
1645 * single command does not lock the entire session list.
1647 session
= session_find_by_name(name
);
1648 if (session
!= NULL
) {
1649 ret
= LTTCOMM_EXIST_SESS
;
1653 /* Create tracing session in the registry */
1654 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
1655 LTTNG_SOCK_GET_GID_CRED(creds
));
1656 if (ret
!= LTTCOMM_OK
) {
1661 * Get the newly created session pointer back
1663 * XXX: There is no need for the session lock list here since the caller
1664 * (process_client_msg) is holding it. We might want to change that so a
1665 * single command does not lock the entire session list.
1667 session
= session_find_by_name(name
);
1670 /* Create default consumer output for the session not yet created. */
1671 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1672 if (session
->consumer
== NULL
) {
1673 ret
= LTTCOMM_FATAL
;
1674 goto consumer_error
;
1678 * This means that the lttng_create_session call was called with the _path_
1679 * argument set to NULL.
1683 * At this point, we'll skip the consumer URI setup and create a
1684 * session with a NULL path which will flag the session to NOT spawn a
1687 DBG("Create session %s with NO uri, skipping consumer setup", name
);
1691 session
->start_consumer
= 1;
1693 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1694 if (ret
!= LTTCOMM_OK
) {
1695 goto consumer_error
;
1698 session
->consumer
->enabled
= 1;
1704 session_destroy(session
);
1711 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1713 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1716 struct ltt_ust_session
*usess
;
1717 struct ltt_kernel_session
*ksess
;
1722 usess
= session
->ust_session
;
1723 ksess
= session
->kernel_session
;
1725 /* Clean kernel session teardown */
1726 kernel_destroy_session(ksess
);
1728 /* UST session teardown */
1730 /* Close any relayd session */
1731 consumer_output_send_destroy_relayd(usess
->consumer
);
1733 /* Destroy every UST application related to this session. */
1734 ret
= ust_app_destroy_trace_all(usess
);
1736 ERR("Error in ust_app_destroy_trace_all");
1739 /* Clean up the rest. */
1740 trace_ust_destroy_session(usess
);
1744 * Must notify the kernel thread here to update it's poll set in order to
1745 * remove the channel(s)' fd just destroyed.
1747 ret
= notify_thread_pipe(wpipe
);
1749 PERROR("write kernel poll pipe");
1752 ret
= session_destroy(session
);
1758 * Command LTTNG_CALIBRATE processed by the client thread.
1760 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1765 case LTTNG_DOMAIN_KERNEL
:
1767 struct lttng_kernel_calibrate kcalibrate
;
1769 kcalibrate
.type
= calibrate
->type
;
1770 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1772 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
1777 case LTTNG_DOMAIN_UST
:
1779 struct lttng_ust_calibrate ucalibrate
;
1781 ucalibrate
.type
= calibrate
->type
;
1782 ret
= ust_app_calibrate_glb(&ucalibrate
);
1784 ret
= LTTCOMM_UST_CALIBRATE_FAIL
;
1801 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1803 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1804 const char *sock_path
, struct consumer_data
*cdata
)
1807 struct consumer_socket
*socket
;
1814 case LTTNG_DOMAIN_KERNEL
:
1816 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1820 /* Can't register a consumer if there is already one */
1821 if (ksess
->consumer_fds_sent
!= 0) {
1822 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1826 sock
= lttcomm_connect_unix_sock(sock_path
);
1828 ret
= LTTCOMM_CONNECT_FAIL
;
1832 socket
= consumer_allocate_socket(sock
);
1833 if (socket
== NULL
) {
1834 ret
= LTTCOMM_FATAL
;
1839 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1840 if (socket
->lock
== NULL
) {
1841 PERROR("zmalloc pthread mutex");
1842 ret
= LTTCOMM_FATAL
;
1845 pthread_mutex_init(socket
->lock
, NULL
);
1846 socket
->registered
= 1;
1849 consumer_add_socket(socket
, ksess
->consumer
);
1852 pthread_mutex_lock(&cdata
->pid_mutex
);
1854 pthread_mutex_unlock(&cdata
->pid_mutex
);
1859 /* TODO: Userspace tracing */
1871 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1873 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1874 struct lttng_domain
**domains
)
1879 if (session
->kernel_session
!= NULL
) {
1880 DBG3("Listing domains found kernel domain");
1884 if (session
->ust_session
!= NULL
) {
1885 DBG3("Listing domains found UST global domain");
1889 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1890 if (*domains
== NULL
) {
1891 ret
= -LTTCOMM_FATAL
;
1895 if (session
->kernel_session
!= NULL
) {
1896 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1900 if (session
->ust_session
!= NULL
) {
1901 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1913 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1915 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1916 struct lttng_channel
**channels
)
1919 ssize_t nb_chan
= 0;
1922 case LTTNG_DOMAIN_KERNEL
:
1923 if (session
->kernel_session
!= NULL
) {
1924 nb_chan
= session
->kernel_session
->channel_count
;
1926 DBG3("Number of kernel channels %zd", nb_chan
);
1928 case LTTNG_DOMAIN_UST
:
1929 if (session
->ust_session
!= NULL
) {
1930 nb_chan
= lttng_ht_get_count(
1931 session
->ust_session
->domain_global
.channels
);
1933 DBG3("Number of UST global channels %zd", nb_chan
);
1942 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
1943 if (*channels
== NULL
) {
1944 ret
= -LTTCOMM_FATAL
;
1948 list_lttng_channels(domain
, session
, *channels
);
1960 * Command LTTNG_LIST_EVENTS processed by the client thread.
1962 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
1963 char *channel_name
, struct lttng_event
**events
)
1966 ssize_t nb_event
= 0;
1969 case LTTNG_DOMAIN_KERNEL
:
1970 if (session
->kernel_session
!= NULL
) {
1971 nb_event
= list_lttng_kernel_events(channel_name
,
1972 session
->kernel_session
, events
);
1975 case LTTNG_DOMAIN_UST
:
1977 if (session
->ust_session
!= NULL
) {
1978 nb_event
= list_lttng_ust_global_events(channel_name
,
1979 &session
->ust_session
->domain_global
, events
);
1995 * Using the session list, filled a lttng_session array to send back to the
1996 * client for session listing.
1998 * The session list lock MUST be acquired before calling this function. Use
1999 * session_lock_list() and session_unlock_list().
2001 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2006 struct ltt_session
*session
;
2007 struct ltt_session_list
*list
= session_get_list();
2009 DBG("Getting all available session for UID %d GID %d",
2012 * Iterate over session list and append data after the control struct in
2015 cds_list_for_each_entry(session
, &list
->head
, list
) {
2017 * Only list the sessions the user can control.
2019 if (!session_access_ok(session
, uid
, gid
)) {
2023 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2024 struct ltt_ust_session
*usess
= session
->ust_session
;
2026 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2027 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2028 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2029 ret
= build_network_session_path(sessions
[i
].path
,
2030 sizeof(session
[i
].path
), session
);
2032 ret
= snprintf(sessions
[i
].path
, sizeof(session
[i
].path
), "%s",
2033 session
->consumer
->dst
.trace_path
);
2036 PERROR("snprintf session path");
2040 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2041 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2042 sessions
[i
].enabled
= session
->enabled
;
2048 * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
2050 int cmd_disable_consumer(int domain
, struct ltt_session
*session
)
2053 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2054 struct ltt_ust_session
*usess
= session
->ust_session
;
2055 struct consumer_output
*consumer
;
2059 if (session
->enabled
) {
2060 /* Can't disable consumer on an already started session */
2061 ret
= LTTCOMM_TRACE_ALREADY_STARTED
;
2065 if (!session
->start_consumer
) {
2066 ret
= LTTCOMM_NO_CONSUMER
;
2072 DBG("Disable tracing session %s consumer", session
->name
);
2073 consumer
= session
->consumer
;
2075 case LTTNG_DOMAIN_KERNEL
:
2076 /* Code flow error if we don't have a kernel session here. */
2079 DBG("Disabling kernel consumer");
2080 consumer
= ksess
->consumer
;
2083 case LTTNG_DOMAIN_UST
:
2084 /* Code flow error if we don't have a UST session here. */
2087 DBG("Disabling UST consumer");
2088 consumer
= usess
->consumer
;
2092 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2097 consumer
->enabled
= 0;
2098 /* Success at this point */
2101 ret
= LTTCOMM_NO_CONSUMER
;
2109 * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
2111 int cmd_enable_consumer(int domain
, struct ltt_session
*session
)
2114 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2115 struct ltt_ust_session
*usess
= session
->ust_session
;
2116 struct consumer_output
*consumer
= NULL
;
2120 /* Can't enable consumer after session started. */
2121 if (session
->enabled
) {
2122 ret
= LTTCOMM_TRACE_ALREADY_STARTED
;
2126 if (!session
->start_consumer
) {
2127 ret
= LTTCOMM_NO_CONSUMER
;
2133 assert(session
->consumer
);
2134 consumer
= session
->consumer
;
2136 case LTTNG_DOMAIN_KERNEL
:
2137 /* Code flow error if we don't have a kernel session here. */
2141 * Check if we have already sent fds to the consumer. In that case,
2142 * the enable-consumer command can't be used because a start trace
2143 * had previously occured.
2145 if (ksess
->consumer_fds_sent
) {
2146 ret
= LTTCOMM_ENABLE_CONSUMER_FAIL
;
2150 consumer
= ksess
->tmp_consumer
;
2151 if (consumer
== NULL
) {
2153 /* No temp. consumer output exists. Using the current one. */
2154 DBG3("No temporary consumer. Using default");
2155 consumer
= ksess
->consumer
;
2159 switch (consumer
->type
) {
2160 case CONSUMER_DST_LOCAL
:
2161 DBG2("Consumer output is local. Creating directory(ies)");
2163 /* Create directory(ies) */
2164 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2165 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2167 if (ret
!= -EEXIST
) {
2168 ERR("Trace directory creation error");
2169 ret
= LTTCOMM_FATAL
;
2174 case CONSUMER_DST_NET
:
2175 DBG2("Consumer output is network. Validating URIs");
2176 /* Validate if we have both control and data path set. */
2177 if (!consumer
->dst
.net
.control_isset
) {
2178 ret
= LTTCOMM_URL_CTRL_MISS
;
2182 if (!consumer
->dst
.net
.data_isset
) {
2183 ret
= LTTCOMM_URL_DATA_MISS
;
2187 /* Check established network session state */
2188 if (session
->net_handle
== 0) {
2189 ret
= LTTCOMM_ENABLE_CONSUMER_FAIL
;
2190 ERR("Session network handle is not set on enable-consumer");
2197 /* Append default kernel trace dir to subdir */
2198 strncat(ksess
->consumer
->subdir
, DEFAULT_KERNEL_TRACE_DIR
,
2199 sizeof(ksess
->consumer
->subdir
));
2203 * This is race free for now since the session lock is acquired before
2204 * ending up in this function. No other threads can access this kernel
2205 * session without this lock hence freeing the consumer output object
2209 consumer_destroy_output(ksess
->consumer
);
2211 ksess
->consumer
= consumer
;
2212 ksess
->tmp_consumer
= NULL
;
2215 case LTTNG_DOMAIN_UST
:
2216 /* Code flow error if we don't have a UST session here. */
2220 * Check if we have already sent fds to the consumer. In that case,
2221 * the enable-consumer command can't be used because a start trace
2222 * had previously occured.
2224 if (usess
->start_trace
) {
2225 ret
= LTTCOMM_ENABLE_CONSUMER_FAIL
;
2229 consumer
= usess
->tmp_consumer
;
2230 if (consumer
== NULL
) {
2232 /* No temp. consumer output exists. Using the current one. */
2233 DBG3("No temporary consumer. Using default");
2234 consumer
= usess
->consumer
;
2238 switch (consumer
->type
) {
2239 case CONSUMER_DST_LOCAL
:
2240 DBG2("Consumer output is local. Creating directory(ies)");
2242 /* Create directory(ies) */
2243 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2244 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2246 if (ret
!= -EEXIST
) {
2247 ERR("Trace directory creation error");
2248 ret
= LTTCOMM_FATAL
;
2253 case CONSUMER_DST_NET
:
2254 DBG2("Consumer output is network. Validating URIs");
2255 /* Validate if we have both control and data path set. */
2256 if (!consumer
->dst
.net
.control_isset
) {
2257 ret
= LTTCOMM_URL_CTRL_MISS
;
2261 if (!consumer
->dst
.net
.data_isset
) {
2262 ret
= LTTCOMM_URL_DATA_MISS
;
2266 /* Check established network session state */
2267 if (session
->net_handle
== 0) {
2268 ret
= LTTCOMM_ENABLE_CONSUMER_FAIL
;
2269 DBG2("Session network handle is not set on enable-consumer");
2273 if (consumer
->net_seq_index
== -1) {
2274 ret
= LTTCOMM_ENABLE_CONSUMER_FAIL
;
2275 DBG2("Network index is not set on the consumer");
2282 /* Append default kernel trace dir to subdir */
2283 strncat(usess
->consumer
->subdir
, DEFAULT_UST_TRACE_DIR
,
2284 sizeof(usess
->consumer
->subdir
));
2288 * This is race free for now since the session lock is acquired before
2289 * ending up in this function. No other threads can access this kernel
2290 * session without this lock hence freeing the consumer output object
2294 consumer_destroy_output(usess
->consumer
);
2296 usess
->consumer
= consumer
;
2297 usess
->tmp_consumer
= NULL
;
2304 consumer
->enabled
= 1;
2305 /* Success at this point */
2308 /* Should not really happend... */
2309 ret
= LTTCOMM_NO_CONSUMER
;
2317 * Init command subsystem.
2322 * Set network sequence index to 1 for streams to match a relayd socket on
2323 * the consumer side.
2325 uatomic_set(&relayd_net_seq_idx
, 1);
2327 DBG("Command subsystem initialized");