2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #include <urcu/list.h>
21 #include <urcu/uatomic.h>
23 #include <common/defaults.h>
24 #include <common/common.h>
25 #include <common/sessiond-comm/sessiond-comm.h>
26 #include <common/relayd/relayd.h>
32 #include "kernel-consumer.h"
33 #include "lttng-sessiond.h"
39 * Used to keep a unique index for each relayd socket created where this value
40 * is associated with streams on the consumer so it can match the right relayd
43 * This value should be incremented atomically for safety purposes and future
44 * possible concurrent access.
46 static unsigned int relayd_net_seq_idx
;
49 * Create a session path used by list_lttng_sessions for the case that the
50 * session consumer is on the network.
52 static int build_network_session_path(char *dst
, size_t size
,
53 struct ltt_session
*session
)
55 int ret
, kdata_port
, udata_port
;
56 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
57 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
62 memset(tmp_urls
, 0, sizeof(tmp_urls
));
63 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
65 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
67 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
68 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
69 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
72 if (session
->ust_session
&& session
->ust_session
->consumer
) {
73 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
74 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
77 if (uuri
== NULL
&& kuri
== NULL
) {
78 uri
= &session
->consumer
->dst
.net
.control
;
79 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
80 } else if (kuri
&& uuri
) {
81 ret
= uri_compare(kuri
, uuri
);
85 /* Build uuri URL string */
86 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
93 } else if (kuri
&& uuri
== NULL
) {
95 } else if (uuri
&& kuri
== NULL
) {
99 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
104 if (strlen(tmp_uurl
) > 0) {
105 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
106 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
108 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, kdata_port
);
116 * Fill lttng_channel array of all channels.
118 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
119 struct lttng_channel
*channels
)
122 struct ltt_kernel_channel
*kchan
;
124 DBG("Listing channels for session %s", session
->name
);
127 case LTTNG_DOMAIN_KERNEL
:
128 /* Kernel channels */
129 if (session
->kernel_session
!= NULL
) {
130 cds_list_for_each_entry(kchan
,
131 &session
->kernel_session
->channel_list
.head
, list
) {
132 /* Copy lttng_channel struct to array */
133 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
134 channels
[i
].enabled
= kchan
->enabled
;
139 case LTTNG_DOMAIN_UST
:
141 struct lttng_ht_iter iter
;
142 struct ltt_ust_channel
*uchan
;
144 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
145 &iter
.iter
, uchan
, node
.node
) {
146 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
147 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
148 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
149 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
150 channels
[i
].attr
.switch_timer_interval
=
151 uchan
->attr
.switch_timer_interval
;
152 channels
[i
].attr
.read_timer_interval
=
153 uchan
->attr
.read_timer_interval
;
154 channels
[i
].enabled
= uchan
->enabled
;
155 switch (uchan
->attr
.output
) {
158 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
171 * Create a list of ust global domain events.
173 static int list_lttng_ust_global_events(char *channel_name
,
174 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
177 unsigned int nb_event
= 0;
178 struct lttng_ht_iter iter
;
179 struct lttng_ht_node_str
*node
;
180 struct ltt_ust_channel
*uchan
;
181 struct ltt_ust_event
*uevent
;
182 struct lttng_event
*tmp
;
184 DBG("Listing UST global events for channel %s", channel_name
);
188 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
189 node
= lttng_ht_iter_get_node_str(&iter
);
191 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
195 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
197 nb_event
+= lttng_ht_get_count(uchan
->events
);
204 DBG3("Listing UST global %d events", nb_event
);
206 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
208 ret
= LTTNG_ERR_FATAL
;
212 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
213 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
214 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
215 tmp
[i
].enabled
= uevent
->enabled
;
217 switch (uevent
->attr
.instrumentation
) {
218 case LTTNG_UST_TRACEPOINT
:
219 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
221 case LTTNG_UST_PROBE
:
222 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
224 case LTTNG_UST_FUNCTION
:
225 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
229 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
230 switch (uevent
->attr
.loglevel_type
) {
231 case LTTNG_UST_LOGLEVEL_ALL
:
232 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
234 case LTTNG_UST_LOGLEVEL_RANGE
:
235 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
237 case LTTNG_UST_LOGLEVEL_SINGLE
:
238 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
241 if (uevent
->filter
) {
256 * Fill lttng_event array of all kernel events in the channel.
258 static int list_lttng_kernel_events(char *channel_name
,
259 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
262 unsigned int nb_event
;
263 struct ltt_kernel_event
*event
;
264 struct ltt_kernel_channel
*kchan
;
266 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
268 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
272 nb_event
= kchan
->event_count
;
274 DBG("Listing events for channel %s", kchan
->channel
->name
);
280 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
281 if (*events
== NULL
) {
282 ret
= LTTNG_ERR_FATAL
;
286 /* Kernel channels */
287 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
288 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
289 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
290 (*events
)[i
].enabled
= event
->enabled
;
292 switch (event
->event
->instrumentation
) {
293 case LTTNG_KERNEL_TRACEPOINT
:
294 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
296 case LTTNG_KERNEL_KPROBE
:
297 case LTTNG_KERNEL_KRETPROBE
:
298 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
299 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
300 sizeof(struct lttng_kernel_kprobe
));
302 case LTTNG_KERNEL_FUNCTION
:
303 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
304 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
305 sizeof(struct lttng_kernel_function
));
307 case LTTNG_KERNEL_NOOP
:
308 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
310 case LTTNG_KERNEL_SYSCALL
:
311 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
313 case LTTNG_KERNEL_ALL
:
324 /* Negate the error code to differentiate the size from an error */
329 * Add URI so the consumer output object. Set the correct path depending on the
330 * domain adding the default trace directory.
332 static int add_uri_to_consumer(struct consumer_output
*consumer
,
333 struct lttng_uri
*uri
, int domain
, const char *session_name
)
336 const char *default_trace_dir
;
340 if (consumer
== NULL
) {
341 DBG("No consumer detected. Don't add URI. Stopping.");
342 ret
= LTTNG_ERR_NO_CONSUMER
;
347 case LTTNG_DOMAIN_KERNEL
:
348 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
350 case LTTNG_DOMAIN_UST
:
351 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
355 * This case is possible is we try to add the URI to the global tracing
356 * session consumer object which in this case there is no subdir.
358 default_trace_dir
= "";
361 switch (uri
->dtype
) {
364 DBG2("Setting network URI to consumer");
366 /* Set URI into consumer output object */
367 ret
= consumer_set_network_uri(consumer
, uri
);
369 ret
= LTTNG_ERR_FATAL
;
371 } else if (ret
== 1) {
373 * URI was the same in the consumer so we do not append the subdir
374 * again so to not duplicate output dir.
379 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
380 ret
= consumer_set_subdir(consumer
, session_name
);
382 ret
= LTTNG_ERR_FATAL
;
387 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
388 /* On a new subdir, reappend the default trace dir. */
389 strncat(consumer
->subdir
, default_trace_dir
,
390 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
391 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
396 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
397 memset(consumer
->dst
.trace_path
, 0,
398 sizeof(consumer
->dst
.trace_path
));
399 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
400 sizeof(consumer
->dst
.trace_path
));
401 /* Append default trace dir */
402 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
403 sizeof(consumer
->dst
.trace_path
) -
404 strlen(consumer
->dst
.trace_path
) - 1);
405 /* Flag consumer as local. */
406 consumer
->type
= CONSUMER_DST_LOCAL
;
415 * Init tracing by creating trace directory and sending fds kernel consumer.
417 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
420 struct lttng_ht_iter iter
;
421 struct consumer_socket
*socket
;
425 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
426 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
428 /* Code flow error */
429 assert(socket
->fd
>= 0);
431 pthread_mutex_lock(socket
->lock
);
432 ret
= kernel_consumer_send_session(socket
->fd
, session
);
433 pthread_mutex_unlock(socket
->lock
);
435 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
446 * Create a socket to the relayd using the URI.
448 * On success, the relayd_sock pointer is set to the created socket.
449 * Else, it's stays untouched and a lttcomm error code is returned.
451 static int create_connect_relayd(struct consumer_output
*output
,
452 const char *session_name
, struct lttng_uri
*uri
,
453 struct lttcomm_sock
**relayd_sock
)
456 struct lttcomm_sock
*sock
;
458 /* Create socket object from URI */
459 sock
= lttcomm_alloc_sock_from_uri(uri
);
461 ret
= LTTNG_ERR_FATAL
;
465 ret
= lttcomm_create_sock(sock
);
467 ret
= LTTNG_ERR_FATAL
;
471 /* Connect to relayd so we can proceed with a session creation. */
472 ret
= relayd_connect(sock
);
474 ERR("Unable to reach lttng-relayd");
475 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
479 /* Create socket for control stream. */
480 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
481 DBG3("Creating relayd stream socket from URI");
483 /* Check relayd version */
484 ret
= relayd_version_check(sock
, RELAYD_VERSION_COMM_MAJOR
,
485 RELAYD_VERSION_COMM_MINOR
);
487 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
490 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
491 DBG3("Creating relayd data socket from URI");
493 /* Command is not valid */
494 ERR("Relayd invalid stream type: %d", uri
->stype
);
495 ret
= LTTNG_ERR_INVALID
;
505 (void) relayd_close(sock
);
509 lttcomm_destroy_sock(sock
);
516 * Connect to the relayd using URI and send the socket to the right consumer.
518 static int send_consumer_relayd_socket(int domain
, struct ltt_session
*session
,
519 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
523 struct lttcomm_sock
*sock
= NULL
;
525 /* Don't resend the sockets to the consumer. */
526 if (consumer
->dst
.net
.relayd_socks_sent
) {
531 /* Set the network sequence index if not set. */
532 if (consumer
->net_seq_index
== -1) {
534 * Increment net_seq_idx because we are about to transfer the
535 * new relayd socket to the consumer.
537 uatomic_inc(&relayd_net_seq_idx
);
538 /* Assign unique key so the consumer can match streams */
539 uatomic_set(&consumer
->net_seq_index
,
540 uatomic_read(&relayd_net_seq_idx
));
543 /* Connect to relayd and make version check if uri is the control. */
544 ret
= create_connect_relayd(consumer
, session
->name
, relayd_uri
, &sock
);
545 if (ret
!= LTTNG_OK
) {
549 /* If the control socket is connected, network session is ready */
550 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
551 session
->net_handle
= 1;
554 /* Send relayd socket to consumer. */
555 ret
= consumer_send_relayd_socket(consumer_fd
, sock
,
556 consumer
, relayd_uri
->stype
);
558 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
565 * Close socket which was dup on the consumer side. The session daemon does
566 * NOT keep track of the relayd socket(s) once transfer to the consumer.
571 (void) relayd_close(sock
);
572 lttcomm_destroy_sock(sock
);
580 * Send both relayd sockets to a specific consumer and domain. This is a
581 * helper function to facilitate sending the information to the consumer for a
584 static int send_consumer_relayd_sockets(int domain
,
585 struct ltt_session
*session
, struct consumer_output
*consumer
, int fd
)
592 /* Don't resend the sockets to the consumer. */
593 if (consumer
->dst
.net
.relayd_socks_sent
) {
598 /* Sending control relayd socket. */
599 ret
= send_consumer_relayd_socket(domain
, session
,
600 &consumer
->dst
.net
.control
, consumer
, fd
);
601 if (ret
!= LTTNG_OK
) {
605 /* Sending data relayd socket. */
606 ret
= send_consumer_relayd_socket(domain
, session
,
607 &consumer
->dst
.net
.data
, consumer
, fd
);
608 if (ret
!= LTTNG_OK
) {
612 /* Flag that all relayd sockets were sent to the consumer. */
613 consumer
->dst
.net
.relayd_socks_sent
= 1;
620 * Setup relayd connections for a tracing session. First creates the socket to
621 * the relayd and send them to the right domain consumer. Consumer type MUST be
624 static int setup_relayd(struct ltt_session
*session
)
627 struct ltt_ust_session
*usess
;
628 struct ltt_kernel_session
*ksess
;
629 struct consumer_socket
*socket
;
630 struct lttng_ht_iter iter
;
634 usess
= session
->ust_session
;
635 ksess
= session
->kernel_session
;
637 DBG2("Setting relayd for session %s", session
->name
);
639 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
640 && usess
->consumer
->enabled
) {
641 /* For each consumer socket, send relayd sockets */
642 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
644 /* Code flow error */
645 assert(socket
->fd
>= 0);
647 pthread_mutex_lock(socket
->lock
);
648 send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
,
649 usess
->consumer
, socket
->fd
);
650 pthread_mutex_unlock(socket
->lock
);
651 if (ret
!= LTTNG_OK
) {
657 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
658 && ksess
->consumer
->enabled
) {
659 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
661 /* Code flow error */
662 assert(socket
->fd
>= 0);
664 pthread_mutex_lock(socket
->lock
);
665 send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
,
666 ksess
->consumer
, socket
->fd
);
667 pthread_mutex_unlock(socket
->lock
);
668 if (ret
!= LTTNG_OK
) {
679 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
681 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
685 struct ltt_ust_session
*usess
;
687 usess
= session
->ust_session
;
690 case LTTNG_DOMAIN_KERNEL
:
692 ret
= channel_kernel_disable(session
->kernel_session
,
694 if (ret
!= LTTNG_OK
) {
698 kernel_wait_quiescent(kernel_tracer_fd
);
701 case LTTNG_DOMAIN_UST
:
703 struct ltt_ust_channel
*uchan
;
704 struct lttng_ht
*chan_ht
;
706 chan_ht
= usess
->domain_global
.channels
;
708 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
710 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
714 ret
= channel_ust_disable(usess
, domain
, uchan
);
715 if (ret
!= LTTNG_OK
) {
721 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
722 case LTTNG_DOMAIN_UST_EXEC_NAME
:
723 case LTTNG_DOMAIN_UST_PID
:
726 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
737 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
739 * The wpipe arguments is used as a notifier for the kernel thread.
741 int cmd_enable_channel(struct ltt_session
*session
,
742 int domain
, struct lttng_channel
*attr
, int wpipe
)
745 struct ltt_ust_session
*usess
= session
->ust_session
;
746 struct lttng_ht
*chan_ht
;
751 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
754 case LTTNG_DOMAIN_KERNEL
:
756 struct ltt_kernel_channel
*kchan
;
758 /* Mandatory for a kernel channel. */
761 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
762 session
->kernel_session
);
764 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
766 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
769 if (ret
!= LTTNG_OK
) {
773 kernel_wait_quiescent(kernel_tracer_fd
);
776 case LTTNG_DOMAIN_UST
:
778 struct ltt_ust_channel
*uchan
;
780 chan_ht
= usess
->domain_global
.channels
;
782 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
784 ret
= channel_ust_create(usess
, domain
, attr
);
786 ret
= channel_ust_enable(usess
, domain
, uchan
);
791 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
792 case LTTNG_DOMAIN_UST_EXEC_NAME
:
793 case LTTNG_DOMAIN_UST_PID
:
796 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
806 * Command LTTNG_DISABLE_EVENT processed by the client thread.
808 int cmd_disable_event(struct ltt_session
*session
, int domain
,
809 char *channel_name
, char *event_name
)
814 case LTTNG_DOMAIN_KERNEL
:
816 struct ltt_kernel_channel
*kchan
;
817 struct ltt_kernel_session
*ksess
;
819 ksess
= session
->kernel_session
;
821 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
823 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
827 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
828 if (ret
!= LTTNG_OK
) {
832 kernel_wait_quiescent(kernel_tracer_fd
);
835 case LTTNG_DOMAIN_UST
:
837 struct ltt_ust_channel
*uchan
;
838 struct ltt_ust_session
*usess
;
840 usess
= session
->ust_session
;
842 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
845 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
849 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
850 if (ret
!= LTTNG_OK
) {
854 DBG3("Disable UST event %s in channel %s completed", event_name
,
859 case LTTNG_DOMAIN_UST_EXEC_NAME
:
860 case LTTNG_DOMAIN_UST_PID
:
861 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
875 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
877 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
883 case LTTNG_DOMAIN_KERNEL
:
885 struct ltt_kernel_session
*ksess
;
886 struct ltt_kernel_channel
*kchan
;
888 ksess
= session
->kernel_session
;
890 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
892 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
896 ret
= event_kernel_disable_all(ksess
, kchan
);
897 if (ret
!= LTTNG_OK
) {
901 kernel_wait_quiescent(kernel_tracer_fd
);
904 case LTTNG_DOMAIN_UST
:
906 struct ltt_ust_session
*usess
;
907 struct ltt_ust_channel
*uchan
;
909 usess
= session
->ust_session
;
911 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
914 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
918 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
923 DBG3("Disable all UST events in channel %s completed", channel_name
);
928 case LTTNG_DOMAIN_UST_EXEC_NAME
:
929 case LTTNG_DOMAIN_UST_PID
:
930 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
944 * Command LTTNG_ADD_CONTEXT processed by the client thread.
946 int cmd_add_context(struct ltt_session
*session
, int domain
,
947 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
952 case LTTNG_DOMAIN_KERNEL
:
953 /* Add kernel context to kernel tracer */
954 ret
= context_kernel_add(session
->kernel_session
, ctx
,
955 event_name
, channel_name
);
956 if (ret
!= LTTNG_OK
) {
960 case LTTNG_DOMAIN_UST
:
962 struct ltt_ust_session
*usess
= session
->ust_session
;
966 ret
= context_ust_add(usess
, domain
, ctx
, event_name
, channel_name
);
967 if (ret
!= LTTNG_OK
) {
973 case LTTNG_DOMAIN_UST_EXEC_NAME
:
974 case LTTNG_DOMAIN_UST_PID
:
975 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
989 * Command LTTNG_SET_FILTER processed by the client thread.
991 int cmd_set_filter(struct ltt_session
*session
, int domain
,
992 char *channel_name
, char *event_name
,
993 struct lttng_filter_bytecode
*bytecode
)
998 case LTTNG_DOMAIN_KERNEL
:
999 ret
= LTTNG_ERR_FATAL
;
1001 case LTTNG_DOMAIN_UST
:
1003 struct ltt_ust_session
*usess
= session
->ust_session
;
1005 ret
= filter_ust_set(usess
, domain
, bytecode
, event_name
, channel_name
);
1006 if (ret
!= LTTNG_OK
) {
1012 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1013 case LTTNG_DOMAIN_UST_PID
:
1014 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1017 ret
= LTTNG_ERR_UND
;
1030 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1032 int cmd_enable_event(struct ltt_session
*session
, int domain
,
1033 char *channel_name
, struct lttng_event
*event
, int wpipe
)
1036 struct lttng_channel
*attr
;
1040 assert(channel_name
);
1043 case LTTNG_DOMAIN_KERNEL
:
1045 struct ltt_kernel_channel
*kchan
;
1047 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1048 session
->kernel_session
);
1049 if (kchan
== NULL
) {
1050 attr
= channel_new_default_attr(domain
);
1052 ret
= LTTNG_ERR_FATAL
;
1055 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1057 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1058 if (ret
!= LTTNG_OK
) {
1065 /* Get the newly created kernel channel pointer */
1066 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1067 session
->kernel_session
);
1068 if (kchan
== NULL
) {
1069 /* This sould not happen... */
1070 ret
= LTTNG_ERR_FATAL
;
1074 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
1076 if (ret
!= LTTNG_OK
) {
1080 kernel_wait_quiescent(kernel_tracer_fd
);
1083 case LTTNG_DOMAIN_UST
:
1085 struct ltt_ust_channel
*uchan
;
1086 struct ltt_ust_session
*usess
= session
->ust_session
;
1090 /* Get channel from global UST domain */
1091 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1093 if (uchan
== NULL
) {
1094 /* Create default channel */
1095 attr
= channel_new_default_attr(domain
);
1097 ret
= LTTNG_ERR_FATAL
;
1100 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1102 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1103 if (ret
!= LTTNG_OK
) {
1109 /* Get the newly created channel reference back */
1110 uchan
= trace_ust_find_channel_by_name(
1111 usess
->domain_global
.channels
, channel_name
);
1115 /* At this point, the session and channel exist on the tracer */
1116 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
);
1117 if (ret
!= LTTNG_OK
) {
1123 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1124 case LTTNG_DOMAIN_UST_PID
:
1125 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1128 ret
= LTTNG_ERR_UND
;
1139 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1141 int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
1142 char *channel_name
, int event_type
, int wpipe
)
1145 struct lttng_channel
*attr
;
1148 assert(channel_name
);
1151 case LTTNG_DOMAIN_KERNEL
:
1153 struct ltt_kernel_channel
*kchan
;
1155 assert(session
->kernel_session
);
1157 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1158 session
->kernel_session
);
1159 if (kchan
== NULL
) {
1160 /* Create default channel */
1161 attr
= channel_new_default_attr(domain
);
1163 ret
= LTTNG_ERR_FATAL
;
1166 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1168 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1169 if (ret
!= LTTNG_OK
) {
1175 /* Get the newly created kernel channel pointer */
1176 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1177 session
->kernel_session
);
1181 switch (event_type
) {
1182 case LTTNG_EVENT_SYSCALL
:
1183 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
1184 kchan
, kernel_tracer_fd
);
1186 case LTTNG_EVENT_TRACEPOINT
:
1188 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1189 * events already registered to the channel.
1191 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
1192 kchan
, kernel_tracer_fd
);
1194 case LTTNG_EVENT_ALL
:
1195 /* Enable syscalls and tracepoints */
1196 ret
= event_kernel_enable_all(session
->kernel_session
,
1197 kchan
, kernel_tracer_fd
);
1200 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1204 /* Manage return value */
1205 if (ret
!= LTTNG_OK
) {
1209 kernel_wait_quiescent(kernel_tracer_fd
);
1212 case LTTNG_DOMAIN_UST
:
1214 struct ltt_ust_channel
*uchan
;
1215 struct ltt_ust_session
*usess
= session
->ust_session
;
1219 /* Get channel from global UST domain */
1220 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1222 if (uchan
== NULL
) {
1223 /* Create default channel */
1224 attr
= channel_new_default_attr(domain
);
1226 ret
= LTTNG_ERR_FATAL
;
1229 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1231 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1232 if (ret
!= LTTNG_OK
) {
1238 /* Get the newly created channel reference back */
1239 uchan
= trace_ust_find_channel_by_name(
1240 usess
->domain_global
.channels
, channel_name
);
1244 /* At this point, the session and channel exist on the tracer */
1246 switch (event_type
) {
1247 case LTTNG_EVENT_ALL
:
1248 case LTTNG_EVENT_TRACEPOINT
:
1249 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
);
1250 if (ret
!= LTTNG_OK
) {
1255 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1259 /* Manage return value */
1260 if (ret
!= LTTNG_OK
) {
1267 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1268 case LTTNG_DOMAIN_UST_PID
:
1269 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1272 ret
= LTTNG_ERR_UND
;
1284 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1286 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1289 ssize_t nb_events
= 0;
1292 case LTTNG_DOMAIN_KERNEL
:
1293 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1294 if (nb_events
< 0) {
1295 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1299 case LTTNG_DOMAIN_UST
:
1300 nb_events
= ust_app_list_events(events
);
1301 if (nb_events
< 0) {
1302 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1307 ret
= LTTNG_ERR_UND
;
1314 /* Return negative value to differentiate return code */
1319 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1321 ssize_t
cmd_list_tracepoint_fields(int domain
,
1322 struct lttng_event_field
**fields
)
1325 ssize_t nb_fields
= 0;
1328 case LTTNG_DOMAIN_UST
:
1329 nb_fields
= ust_app_list_event_fields(fields
);
1330 if (nb_fields
< 0) {
1331 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1335 case LTTNG_DOMAIN_KERNEL
:
1336 default: /* fall-through */
1337 ret
= LTTNG_ERR_UND
;
1344 /* Return negative value to differentiate return code */
1349 * Command LTTNG_START_TRACE processed by the client thread.
1351 int cmd_start_trace(struct ltt_session
*session
)
1354 struct ltt_kernel_session
*ksession
;
1355 struct ltt_ust_session
*usess
;
1356 struct ltt_kernel_channel
*kchan
;
1360 /* Ease our life a bit ;) */
1361 ksession
= session
->kernel_session
;
1362 usess
= session
->ust_session
;
1364 if (session
->enabled
) {
1365 /* Already started. */
1366 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1370 session
->enabled
= 1;
1372 ret
= setup_relayd(session
);
1373 if (ret
!= LTTNG_OK
) {
1374 ERR("Error setting up relayd for session %s", session
->name
);
1378 /* Kernel tracing */
1379 if (ksession
!= NULL
) {
1380 /* Open kernel metadata */
1381 if (ksession
->metadata
== NULL
) {
1382 ret
= kernel_open_metadata(ksession
);
1384 ret
= LTTNG_ERR_KERN_META_FAIL
;
1389 /* Open kernel metadata stream */
1390 if (ksession
->metadata_stream_fd
< 0) {
1391 ret
= kernel_open_metadata_stream(ksession
);
1393 ERR("Kernel create metadata stream failed");
1394 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1399 /* For each channel */
1400 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1401 if (kchan
->stream_count
== 0) {
1402 ret
= kernel_open_channel_stream(kchan
);
1404 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1407 /* Update the stream global counter */
1408 ksession
->stream_count_global
+= ret
;
1412 /* Setup kernel consumer socket and send fds to it */
1413 ret
= init_kernel_tracing(ksession
);
1415 ret
= LTTNG_ERR_KERN_START_FAIL
;
1419 /* This start the kernel tracing */
1420 ret
= kernel_start_session(ksession
);
1422 ret
= LTTNG_ERR_KERN_START_FAIL
;
1426 /* Quiescent wait after starting trace */
1427 kernel_wait_quiescent(kernel_tracer_fd
);
1430 /* Flag session that trace should start automatically */
1432 usess
->start_trace
= 1;
1434 ret
= ust_app_start_trace_all(usess
);
1436 ret
= LTTNG_ERR_UST_START_FAIL
;
1448 * Command LTTNG_STOP_TRACE processed by the client thread.
1450 int cmd_stop_trace(struct ltt_session
*session
)
1453 struct ltt_kernel_channel
*kchan
;
1454 struct ltt_kernel_session
*ksession
;
1455 struct ltt_ust_session
*usess
;
1460 ksession
= session
->kernel_session
;
1461 usess
= session
->ust_session
;
1463 if (!session
->enabled
) {
1464 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1468 session
->enabled
= 0;
1472 DBG("Stop kernel tracing");
1474 /* Flush metadata if exist */
1475 if (ksession
->metadata_stream_fd
>= 0) {
1476 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1478 ERR("Kernel metadata flush failed");
1482 /* Flush all buffers before stopping */
1483 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1484 ret
= kernel_flush_buffer(kchan
);
1486 ERR("Kernel flush buffer error");
1490 ret
= kernel_stop_session(ksession
);
1492 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1496 kernel_wait_quiescent(kernel_tracer_fd
);
1500 usess
->start_trace
= 0;
1502 ret
= ust_app_stop_trace_all(usess
);
1504 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1516 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1518 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1519 size_t nb_uri
, struct lttng_uri
*uris
)
1522 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1523 struct ltt_ust_session
*usess
= session
->ust_session
;
1524 struct consumer_output
*consumer
= NULL
;
1530 /* Can't enable consumer after session started. */
1531 if (session
->enabled
) {
1532 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1536 if (!session
->start_consumer
) {
1537 ret
= LTTNG_ERR_NO_CONSUMER
;
1542 * This case switch makes sure the domain session has a temporary consumer
1543 * so the URL can be set.
1547 /* Code flow error. A session MUST always have a consumer object */
1548 assert(session
->consumer
);
1550 * The URL will be added to the tracing session consumer instead of a
1551 * specific domain consumer.
1553 consumer
= session
->consumer
;
1555 case LTTNG_DOMAIN_KERNEL
:
1556 /* Code flow error if we don't have a kernel session here. */
1559 /* Create consumer output if none exists */
1560 consumer
= ksess
->tmp_consumer
;
1561 if (consumer
== NULL
) {
1562 consumer
= consumer_copy_output(ksess
->consumer
);
1563 if (consumer
== NULL
) {
1564 ret
= LTTNG_ERR_FATAL
;
1567 /* Trash the consumer subdir, we are about to set a new one. */
1568 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1569 ksess
->tmp_consumer
= consumer
;
1573 case LTTNG_DOMAIN_UST
:
1574 /* Code flow error if we don't have a kernel session here. */
1577 /* Create consumer output if none exists */
1578 consumer
= usess
->tmp_consumer
;
1579 if (consumer
== NULL
) {
1580 consumer
= consumer_copy_output(usess
->consumer
);
1581 if (consumer
== NULL
) {
1582 ret
= LTTNG_ERR_FATAL
;
1585 /* Trash the consumer subdir, we are about to set a new one. */
1586 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1587 usess
->tmp_consumer
= consumer
;
1593 for (i
= 0; i
< nb_uri
; i
++) {
1594 struct consumer_socket
*socket
;
1595 struct lttng_ht_iter iter
;
1597 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1603 * Don't send relayd socket if URI is NOT remote or if the relayd
1604 * sockets for the session are already sent.
1606 if (uris
[i
].dtype
== LTTNG_DST_PATH
||
1607 consumer
->dst
.net
.relayd_socks_sent
) {
1611 /* Try to send relayd URI to the consumer if exist. */
1613 cds_lfht_for_each_entry(consumer
->socks
->ht
, &iter
.iter
,
1614 socket
, node
.node
) {
1616 /* A socket in the HT should never have a negative fd */
1617 assert(socket
->fd
>= 0);
1619 pthread_mutex_lock(socket
->lock
);
1620 ret
= send_consumer_relayd_socket(domain
, session
, &uris
[i
],
1621 consumer
, socket
->fd
);
1622 pthread_mutex_unlock(socket
->lock
);
1623 if (ret
!= LTTNG_OK
) {
1639 * Command LTTNG_CREATE_SESSION processed by the client thread.
1641 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1642 size_t nb_uri
, lttng_sock_cred
*creds
)
1646 struct ltt_session
*session
;
1651 * Verify if the session already exist
1653 * XXX: There is no need for the session lock list here since the caller
1654 * (process_client_msg) is holding it. We might want to change that so a
1655 * single command does not lock the entire session list.
1657 session
= session_find_by_name(name
);
1658 if (session
!= NULL
) {
1659 ret
= LTTNG_ERR_EXIST_SESS
;
1663 /* Create tracing session in the registry */
1664 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
1665 LTTNG_SOCK_GET_GID_CRED(creds
));
1666 if (ret
!= LTTNG_OK
) {
1671 * Get the newly created session pointer back
1673 * XXX: There is no need for the session lock list here since the caller
1674 * (process_client_msg) is holding it. We might want to change that so a
1675 * single command does not lock the entire session list.
1677 session
= session_find_by_name(name
);
1680 /* Create default consumer output for the session not yet created. */
1681 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1682 if (session
->consumer
== NULL
) {
1683 ret
= LTTNG_ERR_FATAL
;
1684 goto consumer_error
;
1688 * This means that the lttng_create_session call was called with the _path_
1689 * argument set to NULL.
1693 * At this point, we'll skip the consumer URI setup and create a
1694 * session with a NULL path which will flag the session to NOT spawn a
1697 DBG("Create session %s with NO uri, skipping consumer setup", name
);
1701 session
->start_consumer
= 1;
1703 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1704 if (ret
!= LTTNG_OK
) {
1705 goto consumer_error
;
1708 session
->consumer
->enabled
= 1;
1714 session_destroy(session
);
1721 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1723 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1726 struct ltt_ust_session
*usess
;
1727 struct ltt_kernel_session
*ksess
;
1732 usess
= session
->ust_session
;
1733 ksess
= session
->kernel_session
;
1735 /* Clean kernel session teardown */
1736 kernel_destroy_session(ksess
);
1738 /* UST session teardown */
1740 /* Close any relayd session */
1741 consumer_output_send_destroy_relayd(usess
->consumer
);
1743 /* Destroy every UST application related to this session. */
1744 ret
= ust_app_destroy_trace_all(usess
);
1746 ERR("Error in ust_app_destroy_trace_all");
1749 /* Clean up the rest. */
1750 trace_ust_destroy_session(usess
);
1754 * Must notify the kernel thread here to update it's poll set in order to
1755 * remove the channel(s)' fd just destroyed.
1757 ret
= notify_thread_pipe(wpipe
);
1759 PERROR("write kernel poll pipe");
1762 ret
= session_destroy(session
);
1768 * Command LTTNG_CALIBRATE processed by the client thread.
1770 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1775 case LTTNG_DOMAIN_KERNEL
:
1777 struct lttng_kernel_calibrate kcalibrate
;
1779 kcalibrate
.type
= calibrate
->type
;
1780 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1782 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1787 case LTTNG_DOMAIN_UST
:
1789 struct lttng_ust_calibrate ucalibrate
;
1791 ucalibrate
.type
= calibrate
->type
;
1792 ret
= ust_app_calibrate_glb(&ucalibrate
);
1794 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1800 ret
= LTTNG_ERR_UND
;
1811 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1813 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1814 const char *sock_path
, struct consumer_data
*cdata
)
1817 struct consumer_socket
*socket
;
1824 case LTTNG_DOMAIN_KERNEL
:
1826 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1830 /* Can't register a consumer if there is already one */
1831 if (ksess
->consumer_fds_sent
!= 0) {
1832 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1836 sock
= lttcomm_connect_unix_sock(sock_path
);
1838 ret
= LTTNG_ERR_CONNECT_FAIL
;
1842 socket
= consumer_allocate_socket(sock
);
1843 if (socket
== NULL
) {
1844 ret
= LTTNG_ERR_FATAL
;
1849 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1850 if (socket
->lock
== NULL
) {
1851 PERROR("zmalloc pthread mutex");
1852 ret
= LTTNG_ERR_FATAL
;
1855 pthread_mutex_init(socket
->lock
, NULL
);
1856 socket
->registered
= 1;
1859 consumer_add_socket(socket
, ksess
->consumer
);
1862 pthread_mutex_lock(&cdata
->pid_mutex
);
1864 pthread_mutex_unlock(&cdata
->pid_mutex
);
1869 /* TODO: Userspace tracing */
1870 ret
= LTTNG_ERR_UND
;
1881 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1883 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1884 struct lttng_domain
**domains
)
1889 if (session
->kernel_session
!= NULL
) {
1890 DBG3("Listing domains found kernel domain");
1894 if (session
->ust_session
!= NULL
) {
1895 DBG3("Listing domains found UST global domain");
1899 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1900 if (*domains
== NULL
) {
1901 ret
= LTTNG_ERR_FATAL
;
1905 if (session
->kernel_session
!= NULL
) {
1906 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1910 if (session
->ust_session
!= NULL
) {
1911 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1918 /* Return negative value to differentiate return code */
1924 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1926 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1927 struct lttng_channel
**channels
)
1930 ssize_t nb_chan
= 0;
1933 case LTTNG_DOMAIN_KERNEL
:
1934 if (session
->kernel_session
!= NULL
) {
1935 nb_chan
= session
->kernel_session
->channel_count
;
1937 DBG3("Number of kernel channels %zd", nb_chan
);
1939 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1942 case LTTNG_DOMAIN_UST
:
1943 if (session
->ust_session
!= NULL
) {
1944 nb_chan
= lttng_ht_get_count(
1945 session
->ust_session
->domain_global
.channels
);
1947 DBG3("Number of UST global channels %zd", nb_chan
);
1949 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1954 ret
= LTTNG_ERR_UND
;
1959 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
1960 if (*channels
== NULL
) {
1961 ret
= LTTNG_ERR_FATAL
;
1965 list_lttng_channels(domain
, session
, *channels
);
1968 /* Ret value was set in the domain switch case */
1975 /* Return negative value to differentiate return code */
1980 * Command LTTNG_LIST_EVENTS processed by the client thread.
1982 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
1983 char *channel_name
, struct lttng_event
**events
)
1986 ssize_t nb_event
= 0;
1989 case LTTNG_DOMAIN_KERNEL
:
1990 if (session
->kernel_session
!= NULL
) {
1991 nb_event
= list_lttng_kernel_events(channel_name
,
1992 session
->kernel_session
, events
);
1995 case LTTNG_DOMAIN_UST
:
1997 if (session
->ust_session
!= NULL
) {
1998 nb_event
= list_lttng_ust_global_events(channel_name
,
1999 &session
->ust_session
->domain_global
, events
);
2004 ret
= LTTNG_ERR_UND
;
2011 /* Return negative value to differentiate return code */
2016 * Using the session list, filled a lttng_session array to send back to the
2017 * client for session listing.
2019 * The session list lock MUST be acquired before calling this function. Use
2020 * session_lock_list() and session_unlock_list().
2022 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2027 struct ltt_session
*session
;
2028 struct ltt_session_list
*list
= session_get_list();
2030 DBG("Getting all available session for UID %d GID %d",
2033 * Iterate over session list and append data after the control struct in
2036 cds_list_for_each_entry(session
, &list
->head
, list
) {
2038 * Only list the sessions the user can control.
2040 if (!session_access_ok(session
, uid
, gid
)) {
2044 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2045 struct ltt_ust_session
*usess
= session
->ust_session
;
2047 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2048 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2049 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2050 ret
= build_network_session_path(sessions
[i
].path
,
2051 sizeof(session
[i
].path
), session
);
2053 ret
= snprintf(sessions
[i
].path
, sizeof(session
[i
].path
), "%s",
2054 session
->consumer
->dst
.trace_path
);
2057 PERROR("snprintf session path");
2061 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2062 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2063 sessions
[i
].enabled
= session
->enabled
;
2069 * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
2071 int cmd_disable_consumer(int domain
, struct ltt_session
*session
)
2074 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2075 struct ltt_ust_session
*usess
= session
->ust_session
;
2076 struct consumer_output
*consumer
;
2080 if (session
->enabled
) {
2081 /* Can't disable consumer on an already started session */
2082 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2086 if (!session
->start_consumer
) {
2087 ret
= LTTNG_ERR_NO_CONSUMER
;
2093 DBG("Disable tracing session %s consumer", session
->name
);
2094 consumer
= session
->consumer
;
2096 case LTTNG_DOMAIN_KERNEL
:
2097 /* Code flow error if we don't have a kernel session here. */
2100 DBG("Disabling kernel consumer");
2101 consumer
= ksess
->consumer
;
2104 case LTTNG_DOMAIN_UST
:
2105 /* Code flow error if we don't have a UST session here. */
2108 DBG("Disabling UST consumer");
2109 consumer
= usess
->consumer
;
2113 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2118 consumer
->enabled
= 0;
2119 /* Success at this point */
2122 ret
= LTTNG_ERR_NO_CONSUMER
;
2130 * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
2132 int cmd_enable_consumer(int domain
, struct ltt_session
*session
)
2135 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2136 struct ltt_ust_session
*usess
= session
->ust_session
;
2137 struct consumer_output
*consumer
= NULL
;
2141 /* Can't enable consumer after session started. */
2142 if (session
->enabled
) {
2143 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2147 if (!session
->start_consumer
) {
2148 ret
= LTTNG_ERR_NO_CONSUMER
;
2154 assert(session
->consumer
);
2155 consumer
= session
->consumer
;
2157 case LTTNG_DOMAIN_KERNEL
:
2158 /* Code flow error if we don't have a kernel session here. */
2162 * Check if we have already sent fds to the consumer. In that case,
2163 * the enable-consumer command can't be used because a start trace
2164 * had previously occured.
2166 if (ksess
->consumer_fds_sent
) {
2167 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2171 consumer
= ksess
->tmp_consumer
;
2172 if (consumer
== NULL
) {
2174 /* No temp. consumer output exists. Using the current one. */
2175 DBG3("No temporary consumer. Using default");
2176 consumer
= ksess
->consumer
;
2180 switch (consumer
->type
) {
2181 case CONSUMER_DST_LOCAL
:
2182 DBG2("Consumer output is local. Creating directory(ies)");
2184 /* Create directory(ies) */
2185 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2186 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2188 if (ret
!= -EEXIST
) {
2189 ERR("Trace directory creation error");
2190 ret
= LTTNG_ERR_FATAL
;
2195 case CONSUMER_DST_NET
:
2196 DBG2("Consumer output is network. Validating URIs");
2197 /* Validate if we have both control and data path set. */
2198 if (!consumer
->dst
.net
.control_isset
) {
2199 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2203 if (!consumer
->dst
.net
.data_isset
) {
2204 ret
= LTTNG_ERR_URL_DATA_MISS
;
2208 /* Check established network session state */
2209 if (session
->net_handle
== 0) {
2210 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2211 ERR("Session network handle is not set on enable-consumer");
2218 /* Append default kernel trace dir to subdir */
2219 strncat(ksess
->consumer
->subdir
, DEFAULT_KERNEL_TRACE_DIR
,
2220 sizeof(ksess
->consumer
->subdir
) -
2221 strlen(ksess
->consumer
->subdir
) - 1);
2225 * This is race free for now since the session lock is acquired before
2226 * ending up in this function. No other threads can access this kernel
2227 * session without this lock hence freeing the consumer output object
2231 consumer_destroy_output(ksess
->consumer
);
2233 ksess
->consumer
= consumer
;
2234 ksess
->tmp_consumer
= NULL
;
2237 case LTTNG_DOMAIN_UST
:
2238 /* Code flow error if we don't have a UST session here. */
2242 * Check if we have already sent fds to the consumer. In that case,
2243 * the enable-consumer command can't be used because a start trace
2244 * had previously occured.
2246 if (usess
->start_trace
) {
2247 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2251 consumer
= usess
->tmp_consumer
;
2252 if (consumer
== NULL
) {
2254 /* No temp. consumer output exists. Using the current one. */
2255 DBG3("No temporary consumer. Using default");
2256 consumer
= usess
->consumer
;
2260 switch (consumer
->type
) {
2261 case CONSUMER_DST_LOCAL
:
2262 DBG2("Consumer output is local. Creating directory(ies)");
2264 /* Create directory(ies) */
2265 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2266 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2268 if (ret
!= -EEXIST
) {
2269 ERR("Trace directory creation error");
2270 ret
= LTTNG_ERR_FATAL
;
2275 case CONSUMER_DST_NET
:
2276 DBG2("Consumer output is network. Validating URIs");
2277 /* Validate if we have both control and data path set. */
2278 if (!consumer
->dst
.net
.control_isset
) {
2279 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2283 if (!consumer
->dst
.net
.data_isset
) {
2284 ret
= LTTNG_ERR_URL_DATA_MISS
;
2288 /* Check established network session state */
2289 if (session
->net_handle
== 0) {
2290 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2291 DBG2("Session network handle is not set on enable-consumer");
2295 if (consumer
->net_seq_index
== -1) {
2296 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2297 DBG2("Network index is not set on the consumer");
2304 /* Append default kernel trace dir to subdir */
2305 strncat(usess
->consumer
->subdir
, DEFAULT_UST_TRACE_DIR
,
2306 sizeof(usess
->consumer
->subdir
) -
2307 strlen(usess
->consumer
->subdir
) - 1);
2311 * This is race free for now since the session lock is acquired before
2312 * ending up in this function. No other threads can access this kernel
2313 * session without this lock hence freeing the consumer output object
2317 consumer_destroy_output(usess
->consumer
);
2319 usess
->consumer
= consumer
;
2320 usess
->tmp_consumer
= NULL
;
2327 consumer
->enabled
= 1;
2328 /* Success at this point */
2331 /* Should not really happend... */
2332 ret
= LTTNG_ERR_NO_CONSUMER
;
2340 * Init command subsystem.
2345 * Set network sequence index to 1 for streams to match a relayd socket on
2346 * the consumer side.
2348 uatomic_set(&relayd_net_seq_idx
, 1);
2350 DBG("Command subsystem initialized");