2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #include <urcu/list.h>
21 #include <urcu/uatomic.h>
23 #include <common/defaults.h>
24 #include <common/common.h>
25 #include <common/sessiond-comm/sessiond-comm.h>
26 #include <common/relayd/relayd.h>
32 #include "kernel-consumer.h"
33 #include "lttng-sessiond.h"
39 * Used to keep a unique index for each relayd socket created where this value
40 * is associated with streams on the consumer so it can match the right relayd
43 * This value should be incremented atomically for safety purposes and future
44 * possible concurrent access.
46 static unsigned int relayd_net_seq_idx
;
49 * Create a session path used by list_lttng_sessions for the case that the
50 * session consumer is on the network.
52 static int build_network_session_path(char *dst
, size_t size
,
53 struct ltt_session
*session
)
55 int ret
, kdata_port
, udata_port
;
56 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
57 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
62 memset(tmp_urls
, 0, sizeof(tmp_urls
));
63 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
65 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
67 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
68 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
69 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
72 if (session
->ust_session
&& session
->ust_session
->consumer
) {
73 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
74 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
77 if (uuri
== NULL
&& kuri
== NULL
) {
78 uri
= &session
->consumer
->dst
.net
.control
;
79 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
80 } else if (kuri
&& uuri
) {
81 ret
= uri_compare(kuri
, uuri
);
85 /* Build uuri URL string */
86 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
93 } else if (kuri
&& uuri
== NULL
) {
95 } else if (uuri
&& kuri
== NULL
) {
99 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
104 if (strlen(tmp_uurl
) > 0) {
105 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
106 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
108 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, kdata_port
);
116 * Fill lttng_channel array of all channels.
118 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
119 struct lttng_channel
*channels
)
122 struct ltt_kernel_channel
*kchan
;
124 DBG("Listing channels for session %s", session
->name
);
127 case LTTNG_DOMAIN_KERNEL
:
128 /* Kernel channels */
129 if (session
->kernel_session
!= NULL
) {
130 cds_list_for_each_entry(kchan
,
131 &session
->kernel_session
->channel_list
.head
, list
) {
132 /* Copy lttng_channel struct to array */
133 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
134 channels
[i
].enabled
= kchan
->enabled
;
139 case LTTNG_DOMAIN_UST
:
141 struct lttng_ht_iter iter
;
142 struct ltt_ust_channel
*uchan
;
144 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
145 &iter
.iter
, uchan
, node
.node
) {
146 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
147 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
148 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
149 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
150 channels
[i
].attr
.switch_timer_interval
=
151 uchan
->attr
.switch_timer_interval
;
152 channels
[i
].attr
.read_timer_interval
=
153 uchan
->attr
.read_timer_interval
;
154 channels
[i
].enabled
= uchan
->enabled
;
155 switch (uchan
->attr
.output
) {
158 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
171 * Create a list of ust global domain events.
173 static int list_lttng_ust_global_events(char *channel_name
,
174 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
177 unsigned int nb_event
= 0;
178 struct lttng_ht_iter iter
;
179 struct lttng_ht_node_str
*node
;
180 struct ltt_ust_channel
*uchan
;
181 struct ltt_ust_event
*uevent
;
182 struct lttng_event
*tmp
;
184 DBG("Listing UST global events for channel %s", channel_name
);
188 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
189 node
= lttng_ht_iter_get_node_str(&iter
);
191 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
195 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
197 nb_event
+= lttng_ht_get_count(uchan
->events
);
204 DBG3("Listing UST global %d events", nb_event
);
206 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
208 ret
= LTTNG_ERR_FATAL
;
212 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
213 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
214 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
215 tmp
[i
].enabled
= uevent
->enabled
;
217 switch (uevent
->attr
.instrumentation
) {
218 case LTTNG_UST_TRACEPOINT
:
219 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
221 case LTTNG_UST_PROBE
:
222 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
224 case LTTNG_UST_FUNCTION
:
225 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
229 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
230 switch (uevent
->attr
.loglevel_type
) {
231 case LTTNG_UST_LOGLEVEL_ALL
:
232 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
234 case LTTNG_UST_LOGLEVEL_RANGE
:
235 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
237 case LTTNG_UST_LOGLEVEL_SINGLE
:
238 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
241 if (uevent
->filter
) {
256 * Fill lttng_event array of all kernel events in the channel.
258 static int list_lttng_kernel_events(char *channel_name
,
259 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
262 unsigned int nb_event
;
263 struct ltt_kernel_event
*event
;
264 struct ltt_kernel_channel
*kchan
;
266 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
268 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
272 nb_event
= kchan
->event_count
;
274 DBG("Listing events for channel %s", kchan
->channel
->name
);
280 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
281 if (*events
== NULL
) {
282 ret
= LTTNG_ERR_FATAL
;
286 /* Kernel channels */
287 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
288 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
289 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
290 (*events
)[i
].enabled
= event
->enabled
;
292 switch (event
->event
->instrumentation
) {
293 case LTTNG_KERNEL_TRACEPOINT
:
294 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
296 case LTTNG_KERNEL_KPROBE
:
297 case LTTNG_KERNEL_KRETPROBE
:
298 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
299 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
300 sizeof(struct lttng_kernel_kprobe
));
302 case LTTNG_KERNEL_FUNCTION
:
303 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
304 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
305 sizeof(struct lttng_kernel_function
));
307 case LTTNG_KERNEL_NOOP
:
308 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
310 case LTTNG_KERNEL_SYSCALL
:
311 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
313 case LTTNG_KERNEL_ALL
:
324 /* Negate the error code to differentiate the size from an error */
329 * Add URI so the consumer output object. Set the correct path depending on the
330 * domain adding the default trace directory.
332 static int add_uri_to_consumer(struct consumer_output
*consumer
,
333 struct lttng_uri
*uri
, int domain
, const char *session_name
)
336 const char *default_trace_dir
;
340 if (consumer
== NULL
) {
341 DBG("No consumer detected. Don't add URI. Stopping.");
342 ret
= LTTNG_ERR_NO_CONSUMER
;
347 case LTTNG_DOMAIN_KERNEL
:
348 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
350 case LTTNG_DOMAIN_UST
:
351 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
355 * This case is possible is we try to add the URI to the global tracing
356 * session consumer object which in this case there is no subdir.
358 default_trace_dir
= "";
361 switch (uri
->dtype
) {
364 DBG2("Setting network URI to consumer");
366 /* Set URI into consumer output object */
367 ret
= consumer_set_network_uri(consumer
, uri
);
369 ret
= LTTNG_ERR_FATAL
;
371 } else if (ret
== 1) {
373 * URI was the same in the consumer so we do not append the subdir
374 * again so to not duplicate output dir.
379 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
380 ret
= consumer_set_subdir(consumer
, session_name
);
382 ret
= LTTNG_ERR_FATAL
;
387 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
388 /* On a new subdir, reappend the default trace dir. */
389 strncat(consumer
->subdir
, default_trace_dir
,
390 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
391 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
396 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
397 memset(consumer
->dst
.trace_path
, 0,
398 sizeof(consumer
->dst
.trace_path
));
399 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
400 sizeof(consumer
->dst
.trace_path
));
401 /* Append default trace dir */
402 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
403 sizeof(consumer
->dst
.trace_path
) -
404 strlen(consumer
->dst
.trace_path
) - 1);
405 /* Flag consumer as local. */
406 consumer
->type
= CONSUMER_DST_LOCAL
;
415 * Init tracing by creating trace directory and sending fds kernel consumer.
417 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
420 struct lttng_ht_iter iter
;
421 struct consumer_socket
*socket
;
425 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
426 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
428 /* Code flow error */
429 assert(socket
->fd
>= 0);
431 pthread_mutex_lock(socket
->lock
);
432 ret
= kernel_consumer_send_session(socket
->fd
, session
);
433 pthread_mutex_unlock(socket
->lock
);
435 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
446 * Create a socket to the relayd using the URI.
448 * On success, the relayd_sock pointer is set to the created socket.
449 * Else, it's stays untouched and a lttcomm error code is returned.
451 static int create_connect_relayd(struct consumer_output
*output
,
452 const char *session_name
, struct lttng_uri
*uri
,
453 struct lttcomm_sock
**relayd_sock
)
456 struct lttcomm_sock
*sock
;
458 /* Create socket object from URI */
459 sock
= lttcomm_alloc_sock_from_uri(uri
);
461 ret
= LTTNG_ERR_FATAL
;
465 ret
= lttcomm_create_sock(sock
);
467 ret
= LTTNG_ERR_FATAL
;
471 /* Connect to relayd so we can proceed with a session creation. */
472 ret
= relayd_connect(sock
);
474 ERR("Unable to reach lttng-relayd");
475 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
479 /* Create socket for control stream. */
480 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
481 DBG3("Creating relayd stream socket from URI");
483 /* Check relayd version */
484 ret
= relayd_version_check(sock
, RELAYD_VERSION_COMM_MAJOR
,
485 RELAYD_VERSION_COMM_MINOR
);
487 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
490 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
491 DBG3("Creating relayd data socket from URI");
493 /* Command is not valid */
494 ERR("Relayd invalid stream type: %d", uri
->stype
);
495 ret
= LTTNG_ERR_INVALID
;
505 (void) relayd_close(sock
);
509 lttcomm_destroy_sock(sock
);
516 * Connect to the relayd using URI and send the socket to the right consumer.
518 static int send_consumer_relayd_socket(int domain
, struct ltt_session
*session
,
519 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
523 struct lttcomm_sock
*sock
= NULL
;
525 /* Set the network sequence index if not set. */
526 if (consumer
->net_seq_index
== -1) {
528 * Increment net_seq_idx because we are about to transfer the
529 * new relayd socket to the consumer.
531 uatomic_inc(&relayd_net_seq_idx
);
532 /* Assign unique key so the consumer can match streams */
533 uatomic_set(&consumer
->net_seq_index
,
534 uatomic_read(&relayd_net_seq_idx
));
537 /* Connect to relayd and make version check if uri is the control. */
538 ret
= create_connect_relayd(consumer
, session
->name
, relayd_uri
, &sock
);
539 if (ret
!= LTTNG_OK
) {
543 /* If the control socket is connected, network session is ready */
544 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
545 session
->net_handle
= 1;
548 /* Send relayd socket to consumer. */
549 ret
= consumer_send_relayd_socket(consumer_fd
, sock
,
550 consumer
, relayd_uri
->stype
);
552 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
556 /* Flag that the corresponding socket was sent. */
557 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
558 consumer
->dst
.net
.control_sock_sent
= 1;
559 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
560 consumer
->dst
.net
.data_sock_sent
= 1;
566 * Close socket which was dup on the consumer side. The session daemon does
567 * NOT keep track of the relayd socket(s) once transfer to the consumer.
572 (void) relayd_close(sock
);
573 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 /* Sending control relayd socket. */
593 if (!consumer
->dst
.net
.control_sock_sent
) {
594 ret
= send_consumer_relayd_socket(domain
, session
,
595 &consumer
->dst
.net
.control
, consumer
, fd
);
596 if (ret
!= LTTNG_OK
) {
601 /* Sending data relayd socket. */
602 if (!consumer
->dst
.net
.data_sock_sent
) {
603 ret
= send_consumer_relayd_socket(domain
, session
,
604 &consumer
->dst
.net
.data
, consumer
, fd
);
605 if (ret
!= LTTNG_OK
) {
615 * Setup relayd connections for a tracing session. First creates the socket to
616 * the relayd and send them to the right domain consumer. Consumer type MUST be
619 static int setup_relayd(struct ltt_session
*session
)
622 struct ltt_ust_session
*usess
;
623 struct ltt_kernel_session
*ksess
;
624 struct consumer_socket
*socket
;
625 struct lttng_ht_iter iter
;
629 usess
= session
->ust_session
;
630 ksess
= session
->kernel_session
;
632 DBG2("Setting relayd for session %s", session
->name
);
634 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
635 && usess
->consumer
->enabled
) {
636 /* For each consumer socket, send relayd sockets */
637 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
639 /* Code flow error */
640 assert(socket
->fd
>= 0);
642 pthread_mutex_lock(socket
->lock
);
643 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
,
644 usess
->consumer
, socket
->fd
);
645 pthread_mutex_unlock(socket
->lock
);
646 if (ret
!= LTTNG_OK
) {
652 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
653 && ksess
->consumer
->enabled
) {
654 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
656 /* Code flow error */
657 assert(socket
->fd
>= 0);
659 pthread_mutex_lock(socket
->lock
);
660 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
,
661 ksess
->consumer
, socket
->fd
);
662 pthread_mutex_unlock(socket
->lock
);
663 if (ret
!= LTTNG_OK
) {
674 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
676 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
680 struct ltt_ust_session
*usess
;
682 usess
= session
->ust_session
;
685 case LTTNG_DOMAIN_KERNEL
:
687 ret
= channel_kernel_disable(session
->kernel_session
,
689 if (ret
!= LTTNG_OK
) {
693 kernel_wait_quiescent(kernel_tracer_fd
);
696 case LTTNG_DOMAIN_UST
:
698 struct ltt_ust_channel
*uchan
;
699 struct lttng_ht
*chan_ht
;
701 chan_ht
= usess
->domain_global
.channels
;
703 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
705 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
709 ret
= channel_ust_disable(usess
, domain
, uchan
);
710 if (ret
!= LTTNG_OK
) {
716 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
717 case LTTNG_DOMAIN_UST_EXEC_NAME
:
718 case LTTNG_DOMAIN_UST_PID
:
721 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
732 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
734 * The wpipe arguments is used as a notifier for the kernel thread.
736 int cmd_enable_channel(struct ltt_session
*session
,
737 int domain
, struct lttng_channel
*attr
, int wpipe
)
740 struct ltt_ust_session
*usess
= session
->ust_session
;
741 struct lttng_ht
*chan_ht
;
746 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
749 case LTTNG_DOMAIN_KERNEL
:
751 struct ltt_kernel_channel
*kchan
;
753 /* Mandatory for a kernel channel. */
756 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
757 session
->kernel_session
);
759 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
761 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
764 if (ret
!= LTTNG_OK
) {
768 kernel_wait_quiescent(kernel_tracer_fd
);
771 case LTTNG_DOMAIN_UST
:
773 struct ltt_ust_channel
*uchan
;
775 chan_ht
= usess
->domain_global
.channels
;
777 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
779 ret
= channel_ust_create(usess
, domain
, attr
);
781 ret
= channel_ust_enable(usess
, domain
, uchan
);
786 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
787 case LTTNG_DOMAIN_UST_EXEC_NAME
:
788 case LTTNG_DOMAIN_UST_PID
:
791 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
801 * Command LTTNG_DISABLE_EVENT processed by the client thread.
803 int cmd_disable_event(struct ltt_session
*session
, int domain
,
804 char *channel_name
, char *event_name
)
809 case LTTNG_DOMAIN_KERNEL
:
811 struct ltt_kernel_channel
*kchan
;
812 struct ltt_kernel_session
*ksess
;
814 ksess
= session
->kernel_session
;
816 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
818 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
822 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
823 if (ret
!= LTTNG_OK
) {
827 kernel_wait_quiescent(kernel_tracer_fd
);
830 case LTTNG_DOMAIN_UST
:
832 struct ltt_ust_channel
*uchan
;
833 struct ltt_ust_session
*usess
;
835 usess
= session
->ust_session
;
837 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
840 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
844 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
845 if (ret
!= LTTNG_OK
) {
849 DBG3("Disable UST event %s in channel %s completed", event_name
,
854 case LTTNG_DOMAIN_UST_EXEC_NAME
:
855 case LTTNG_DOMAIN_UST_PID
:
856 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
870 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
872 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
878 case LTTNG_DOMAIN_KERNEL
:
880 struct ltt_kernel_session
*ksess
;
881 struct ltt_kernel_channel
*kchan
;
883 ksess
= session
->kernel_session
;
885 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
887 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
891 ret
= event_kernel_disable_all(ksess
, kchan
);
892 if (ret
!= LTTNG_OK
) {
896 kernel_wait_quiescent(kernel_tracer_fd
);
899 case LTTNG_DOMAIN_UST
:
901 struct ltt_ust_session
*usess
;
902 struct ltt_ust_channel
*uchan
;
904 usess
= session
->ust_session
;
906 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
909 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
913 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
918 DBG3("Disable all UST events in channel %s completed", channel_name
);
923 case LTTNG_DOMAIN_UST_EXEC_NAME
:
924 case LTTNG_DOMAIN_UST_PID
:
925 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
939 * Command LTTNG_ADD_CONTEXT processed by the client thread.
941 int cmd_add_context(struct ltt_session
*session
, int domain
,
942 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
,
948 case LTTNG_DOMAIN_KERNEL
:
949 assert(session
->kernel_session
);
951 if (session
->kernel_session
->channel_count
== 0) {
952 /* Create default channel */
953 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
954 if (ret
!= LTTNG_OK
) {
959 /* Add kernel context to kernel tracer */
960 ret
= context_kernel_add(session
->kernel_session
, ctx
,
961 event_name
, channel_name
);
962 if (ret
!= LTTNG_OK
) {
966 case LTTNG_DOMAIN_UST
:
968 struct ltt_ust_session
*usess
= session
->ust_session
;
971 unsigned int chan_count
=
972 lttng_ht_get_count(usess
->domain_global
.channels
);
973 if (chan_count
== 0) {
974 struct lttng_channel
*attr
;
975 /* Create default channel */
976 attr
= channel_new_default_attr(domain
);
978 ret
= LTTNG_ERR_FATAL
;
982 ret
= channel_ust_create(usess
, domain
, attr
);
983 if (ret
!= LTTNG_OK
) {
991 ret
= context_ust_add(usess
, domain
, ctx
, event_name
, channel_name
);
992 if (ret
!= LTTNG_OK
) {
998 case LTTNG_DOMAIN_UST_EXEC_NAME
:
999 case LTTNG_DOMAIN_UST_PID
:
1000 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1003 ret
= LTTNG_ERR_UND
;
1014 * Command LTTNG_SET_FILTER processed by the client thread.
1016 int cmd_set_filter(struct ltt_session
*session
, int domain
,
1017 char *channel_name
, char *event_name
,
1018 struct lttng_filter_bytecode
*bytecode
)
1023 case LTTNG_DOMAIN_KERNEL
:
1024 ret
= LTTNG_ERR_FATAL
;
1026 case LTTNG_DOMAIN_UST
:
1028 struct ltt_ust_session
*usess
= session
->ust_session
;
1030 ret
= filter_ust_set(usess
, domain
, bytecode
, event_name
, channel_name
);
1031 if (ret
!= LTTNG_OK
) {
1037 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1038 case LTTNG_DOMAIN_UST_PID
:
1039 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1042 ret
= LTTNG_ERR_UND
;
1055 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1057 int cmd_enable_event(struct ltt_session
*session
, int domain
,
1058 char *channel_name
, struct lttng_event
*event
, int wpipe
)
1061 struct lttng_channel
*attr
;
1065 assert(channel_name
);
1068 case LTTNG_DOMAIN_KERNEL
:
1070 struct ltt_kernel_channel
*kchan
;
1072 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1073 session
->kernel_session
);
1074 if (kchan
== NULL
) {
1075 attr
= channel_new_default_attr(domain
);
1077 ret
= LTTNG_ERR_FATAL
;
1080 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1082 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1083 if (ret
!= LTTNG_OK
) {
1090 /* Get the newly created kernel channel pointer */
1091 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1092 session
->kernel_session
);
1093 if (kchan
== NULL
) {
1094 /* This sould not happen... */
1095 ret
= LTTNG_ERR_FATAL
;
1099 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
1101 if (ret
!= LTTNG_OK
) {
1105 kernel_wait_quiescent(kernel_tracer_fd
);
1108 case LTTNG_DOMAIN_UST
:
1110 struct ltt_ust_channel
*uchan
;
1111 struct ltt_ust_session
*usess
= session
->ust_session
;
1115 /* Get channel from global UST domain */
1116 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1118 if (uchan
== NULL
) {
1119 /* Create default channel */
1120 attr
= channel_new_default_attr(domain
);
1122 ret
= LTTNG_ERR_FATAL
;
1125 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1127 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1128 if (ret
!= LTTNG_OK
) {
1134 /* Get the newly created channel reference back */
1135 uchan
= trace_ust_find_channel_by_name(
1136 usess
->domain_global
.channels
, channel_name
);
1140 /* At this point, the session and channel exist on the tracer */
1141 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
);
1142 if (ret
!= LTTNG_OK
) {
1148 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1149 case LTTNG_DOMAIN_UST_PID
:
1150 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1153 ret
= LTTNG_ERR_UND
;
1164 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1166 int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
1167 char *channel_name
, int event_type
, int wpipe
)
1170 struct lttng_channel
*attr
;
1173 assert(channel_name
);
1176 case LTTNG_DOMAIN_KERNEL
:
1178 struct ltt_kernel_channel
*kchan
;
1180 assert(session
->kernel_session
);
1182 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1183 session
->kernel_session
);
1184 if (kchan
== NULL
) {
1185 /* Create default channel */
1186 attr
= channel_new_default_attr(domain
);
1188 ret
= LTTNG_ERR_FATAL
;
1191 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1193 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1194 if (ret
!= LTTNG_OK
) {
1200 /* Get the newly created kernel channel pointer */
1201 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1202 session
->kernel_session
);
1206 switch (event_type
) {
1207 case LTTNG_EVENT_SYSCALL
:
1208 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
1209 kchan
, kernel_tracer_fd
);
1211 case LTTNG_EVENT_TRACEPOINT
:
1213 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1214 * events already registered to the channel.
1216 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
1217 kchan
, kernel_tracer_fd
);
1219 case LTTNG_EVENT_ALL
:
1220 /* Enable syscalls and tracepoints */
1221 ret
= event_kernel_enable_all(session
->kernel_session
,
1222 kchan
, kernel_tracer_fd
);
1225 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1229 /* Manage return value */
1230 if (ret
!= LTTNG_OK
) {
1234 kernel_wait_quiescent(kernel_tracer_fd
);
1237 case LTTNG_DOMAIN_UST
:
1239 struct ltt_ust_channel
*uchan
;
1240 struct ltt_ust_session
*usess
= session
->ust_session
;
1244 /* Get channel from global UST domain */
1245 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1247 if (uchan
== NULL
) {
1248 /* Create default channel */
1249 attr
= channel_new_default_attr(domain
);
1251 ret
= LTTNG_ERR_FATAL
;
1254 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1256 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1257 if (ret
!= LTTNG_OK
) {
1263 /* Get the newly created channel reference back */
1264 uchan
= trace_ust_find_channel_by_name(
1265 usess
->domain_global
.channels
, channel_name
);
1269 /* At this point, the session and channel exist on the tracer */
1271 switch (event_type
) {
1272 case LTTNG_EVENT_ALL
:
1273 case LTTNG_EVENT_TRACEPOINT
:
1274 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
);
1275 if (ret
!= LTTNG_OK
) {
1280 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1284 /* Manage return value */
1285 if (ret
!= LTTNG_OK
) {
1292 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1293 case LTTNG_DOMAIN_UST_PID
:
1294 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1297 ret
= LTTNG_ERR_UND
;
1309 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1311 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1314 ssize_t nb_events
= 0;
1317 case LTTNG_DOMAIN_KERNEL
:
1318 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1319 if (nb_events
< 0) {
1320 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1324 case LTTNG_DOMAIN_UST
:
1325 nb_events
= ust_app_list_events(events
);
1326 if (nb_events
< 0) {
1327 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1332 ret
= LTTNG_ERR_UND
;
1339 /* Return negative value to differentiate return code */
1344 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1346 ssize_t
cmd_list_tracepoint_fields(int domain
,
1347 struct lttng_event_field
**fields
)
1350 ssize_t nb_fields
= 0;
1353 case LTTNG_DOMAIN_UST
:
1354 nb_fields
= ust_app_list_event_fields(fields
);
1355 if (nb_fields
< 0) {
1356 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1360 case LTTNG_DOMAIN_KERNEL
:
1361 default: /* fall-through */
1362 ret
= LTTNG_ERR_UND
;
1369 /* Return negative value to differentiate return code */
1374 * Command LTTNG_START_TRACE processed by the client thread.
1376 int cmd_start_trace(struct ltt_session
*session
)
1379 struct ltt_kernel_session
*ksession
;
1380 struct ltt_ust_session
*usess
;
1381 struct ltt_kernel_channel
*kchan
;
1385 /* Ease our life a bit ;) */
1386 ksession
= session
->kernel_session
;
1387 usess
= session
->ust_session
;
1389 if (session
->enabled
) {
1390 /* Already started. */
1391 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1395 session
->enabled
= 1;
1397 ret
= setup_relayd(session
);
1398 if (ret
!= LTTNG_OK
) {
1399 ERR("Error setting up relayd for session %s", session
->name
);
1403 /* Kernel tracing */
1404 if (ksession
!= NULL
) {
1405 /* Open kernel metadata */
1406 if (ksession
->metadata
== NULL
) {
1407 ret
= kernel_open_metadata(ksession
);
1409 ret
= LTTNG_ERR_KERN_META_FAIL
;
1414 /* Open kernel metadata stream */
1415 if (ksession
->metadata_stream_fd
< 0) {
1416 ret
= kernel_open_metadata_stream(ksession
);
1418 ERR("Kernel create metadata stream failed");
1419 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1424 /* For each channel */
1425 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1426 if (kchan
->stream_count
== 0) {
1427 ret
= kernel_open_channel_stream(kchan
);
1429 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1432 /* Update the stream global counter */
1433 ksession
->stream_count_global
+= ret
;
1437 /* Setup kernel consumer socket and send fds to it */
1438 ret
= init_kernel_tracing(ksession
);
1440 ret
= LTTNG_ERR_KERN_START_FAIL
;
1444 /* This start the kernel tracing */
1445 ret
= kernel_start_session(ksession
);
1447 ret
= LTTNG_ERR_KERN_START_FAIL
;
1451 /* Quiescent wait after starting trace */
1452 kernel_wait_quiescent(kernel_tracer_fd
);
1455 /* Flag session that trace should start automatically */
1457 usess
->start_trace
= 1;
1459 ret
= ust_app_start_trace_all(usess
);
1461 ret
= LTTNG_ERR_UST_START_FAIL
;
1473 * Command LTTNG_STOP_TRACE processed by the client thread.
1475 int cmd_stop_trace(struct ltt_session
*session
)
1478 struct ltt_kernel_channel
*kchan
;
1479 struct ltt_kernel_session
*ksession
;
1480 struct ltt_ust_session
*usess
;
1485 ksession
= session
->kernel_session
;
1486 usess
= session
->ust_session
;
1488 if (!session
->enabled
) {
1489 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1493 session
->enabled
= 0;
1497 DBG("Stop kernel tracing");
1499 /* Flush metadata if exist */
1500 if (ksession
->metadata_stream_fd
>= 0) {
1501 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1503 ERR("Kernel metadata flush failed");
1507 /* Flush all buffers before stopping */
1508 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1509 ret
= kernel_flush_buffer(kchan
);
1511 ERR("Kernel flush buffer error");
1515 ret
= kernel_stop_session(ksession
);
1517 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1521 kernel_wait_quiescent(kernel_tracer_fd
);
1525 usess
->start_trace
= 0;
1527 ret
= ust_app_stop_trace_all(usess
);
1529 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1541 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1543 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1544 size_t nb_uri
, struct lttng_uri
*uris
)
1547 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1548 struct ltt_ust_session
*usess
= session
->ust_session
;
1549 struct consumer_output
*consumer
= NULL
;
1555 /* Can't enable consumer after session started. */
1556 if (session
->enabled
) {
1557 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1562 * This case switch makes sure the domain session has a temporary consumer
1563 * so the URL can be set.
1567 /* Code flow error. A session MUST always have a consumer object */
1568 assert(session
->consumer
);
1570 * The URL will be added to the tracing session consumer instead of a
1571 * specific domain consumer.
1573 consumer
= session
->consumer
;
1575 case LTTNG_DOMAIN_KERNEL
:
1576 /* Code flow error if we don't have a kernel session here. */
1579 /* Create consumer output if none exists */
1580 consumer
= ksess
->tmp_consumer
;
1581 if (consumer
== NULL
) {
1582 consumer
= consumer_copy_output(ksess
->consumer
);
1583 if (consumer
== NULL
) {
1584 ret
= LTTNG_ERR_FATAL
;
1587 /* Trash the consumer subdir, we are about to set a new one. */
1588 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1589 ksess
->tmp_consumer
= consumer
;
1593 case LTTNG_DOMAIN_UST
:
1594 /* Code flow error if we don't have a kernel session here. */
1597 /* Create consumer output if none exists */
1598 consumer
= usess
->tmp_consumer
;
1599 if (consumer
== NULL
) {
1600 consumer
= consumer_copy_output(usess
->consumer
);
1601 if (consumer
== NULL
) {
1602 ret
= LTTNG_ERR_FATAL
;
1605 /* Trash the consumer subdir, we are about to set a new one. */
1606 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1607 usess
->tmp_consumer
= consumer
;
1613 for (i
= 0; i
< nb_uri
; i
++) {
1614 struct consumer_socket
*socket
;
1615 struct lttng_ht_iter iter
;
1617 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1623 * Don't send relayd socket if URI is NOT remote or if the relayd
1624 * socket for the session was already sent.
1626 if (uris
[i
].dtype
== LTTNG_DST_PATH
||
1627 (uris
[i
].stype
== LTTNG_STREAM_CONTROL
&&
1628 consumer
->dst
.net
.control_sock_sent
) ||
1629 (uris
[i
].stype
== LTTNG_STREAM_DATA
&&
1630 consumer
->dst
.net
.data_sock_sent
)) {
1634 /* Try to send relayd URI to the consumer if exist. */
1636 cds_lfht_for_each_entry(consumer
->socks
->ht
, &iter
.iter
,
1637 socket
, node
.node
) {
1639 /* A socket in the HT should never have a negative fd */
1640 assert(socket
->fd
>= 0);
1642 pthread_mutex_lock(socket
->lock
);
1643 ret
= send_consumer_relayd_socket(domain
, session
, &uris
[i
],
1644 consumer
, socket
->fd
);
1645 pthread_mutex_unlock(socket
->lock
);
1646 if (ret
!= LTTNG_OK
) {
1662 * Command LTTNG_CREATE_SESSION processed by the client thread.
1664 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1665 size_t nb_uri
, lttng_sock_cred
*creds
)
1669 struct ltt_session
*session
;
1674 * Verify if the session already exist
1676 * XXX: There is no need for the session lock list here since the caller
1677 * (process_client_msg) is holding it. We might want to change that so a
1678 * single command does not lock the entire session list.
1680 session
= session_find_by_name(name
);
1681 if (session
!= NULL
) {
1682 ret
= LTTNG_ERR_EXIST_SESS
;
1686 /* Create tracing session in the registry */
1687 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
1688 LTTNG_SOCK_GET_GID_CRED(creds
));
1689 if (ret
!= LTTNG_OK
) {
1694 * Get the newly created session pointer back
1696 * XXX: There is no need for the session lock list here since the caller
1697 * (process_client_msg) is holding it. We might want to change that so a
1698 * single command does not lock the entire session list.
1700 session
= session_find_by_name(name
);
1703 /* Create default consumer output for the session not yet created. */
1704 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1705 if (session
->consumer
== NULL
) {
1706 ret
= LTTNG_ERR_FATAL
;
1707 goto consumer_error
;
1711 * This means that the lttng_create_session call was called with the _path_
1712 * argument set to NULL.
1716 * At this point, we'll skip the consumer URI setup and create a
1717 * session with a NULL path which will flag the session to NOT spawn a
1720 DBG("Create session %s with NO uri, skipping consumer setup", name
);
1724 session
->start_consumer
= 1;
1726 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1727 if (ret
!= LTTNG_OK
) {
1728 goto consumer_error
;
1731 session
->consumer
->enabled
= 1;
1737 session_destroy(session
);
1744 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1746 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1749 struct ltt_ust_session
*usess
;
1750 struct ltt_kernel_session
*ksess
;
1755 usess
= session
->ust_session
;
1756 ksess
= session
->kernel_session
;
1758 /* Clean kernel session teardown */
1759 kernel_destroy_session(ksess
);
1761 /* UST session teardown */
1763 /* Close any relayd session */
1764 consumer_output_send_destroy_relayd(usess
->consumer
);
1766 /* Destroy every UST application related to this session. */
1767 ret
= ust_app_destroy_trace_all(usess
);
1769 ERR("Error in ust_app_destroy_trace_all");
1772 /* Clean up the rest. */
1773 trace_ust_destroy_session(usess
);
1777 * Must notify the kernel thread here to update it's poll set in order to
1778 * remove the channel(s)' fd just destroyed.
1780 ret
= notify_thread_pipe(wpipe
);
1782 PERROR("write kernel poll pipe");
1785 ret
= session_destroy(session
);
1791 * Command LTTNG_CALIBRATE processed by the client thread.
1793 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1798 case LTTNG_DOMAIN_KERNEL
:
1800 struct lttng_kernel_calibrate kcalibrate
;
1802 kcalibrate
.type
= calibrate
->type
;
1803 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1805 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1810 case LTTNG_DOMAIN_UST
:
1812 struct lttng_ust_calibrate ucalibrate
;
1814 ucalibrate
.type
= calibrate
->type
;
1815 ret
= ust_app_calibrate_glb(&ucalibrate
);
1817 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1823 ret
= LTTNG_ERR_UND
;
1834 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1836 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1837 const char *sock_path
, struct consumer_data
*cdata
)
1840 struct consumer_socket
*socket
;
1847 case LTTNG_DOMAIN_KERNEL
:
1849 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1853 /* Can't register a consumer if there is already one */
1854 if (ksess
->consumer_fds_sent
!= 0) {
1855 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1859 sock
= lttcomm_connect_unix_sock(sock_path
);
1861 ret
= LTTNG_ERR_CONNECT_FAIL
;
1865 socket
= consumer_allocate_socket(sock
);
1866 if (socket
== NULL
) {
1867 ret
= LTTNG_ERR_FATAL
;
1872 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1873 if (socket
->lock
== NULL
) {
1874 PERROR("zmalloc pthread mutex");
1875 ret
= LTTNG_ERR_FATAL
;
1878 pthread_mutex_init(socket
->lock
, NULL
);
1879 socket
->registered
= 1;
1882 consumer_add_socket(socket
, ksess
->consumer
);
1885 pthread_mutex_lock(&cdata
->pid_mutex
);
1887 pthread_mutex_unlock(&cdata
->pid_mutex
);
1892 /* TODO: Userspace tracing */
1893 ret
= LTTNG_ERR_UND
;
1904 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1906 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1907 struct lttng_domain
**domains
)
1912 if (session
->kernel_session
!= NULL
) {
1913 DBG3("Listing domains found kernel domain");
1917 if (session
->ust_session
!= NULL
) {
1918 DBG3("Listing domains found UST global domain");
1922 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1923 if (*domains
== NULL
) {
1924 ret
= LTTNG_ERR_FATAL
;
1928 if (session
->kernel_session
!= NULL
) {
1929 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1933 if (session
->ust_session
!= NULL
) {
1934 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1941 /* Return negative value to differentiate return code */
1947 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1949 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1950 struct lttng_channel
**channels
)
1953 ssize_t nb_chan
= 0;
1956 case LTTNG_DOMAIN_KERNEL
:
1957 if (session
->kernel_session
!= NULL
) {
1958 nb_chan
= session
->kernel_session
->channel_count
;
1960 DBG3("Number of kernel channels %zd", nb_chan
);
1962 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1965 case LTTNG_DOMAIN_UST
:
1966 if (session
->ust_session
!= NULL
) {
1967 nb_chan
= lttng_ht_get_count(
1968 session
->ust_session
->domain_global
.channels
);
1970 DBG3("Number of UST global channels %zd", nb_chan
);
1972 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1977 ret
= LTTNG_ERR_UND
;
1982 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
1983 if (*channels
== NULL
) {
1984 ret
= LTTNG_ERR_FATAL
;
1988 list_lttng_channels(domain
, session
, *channels
);
1991 /* Ret value was set in the domain switch case */
1998 /* Return negative value to differentiate return code */
2003 * Command LTTNG_LIST_EVENTS processed by the client thread.
2005 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2006 char *channel_name
, struct lttng_event
**events
)
2009 ssize_t nb_event
= 0;
2012 case LTTNG_DOMAIN_KERNEL
:
2013 if (session
->kernel_session
!= NULL
) {
2014 nb_event
= list_lttng_kernel_events(channel_name
,
2015 session
->kernel_session
, events
);
2018 case LTTNG_DOMAIN_UST
:
2020 if (session
->ust_session
!= NULL
) {
2021 nb_event
= list_lttng_ust_global_events(channel_name
,
2022 &session
->ust_session
->domain_global
, events
);
2027 ret
= LTTNG_ERR_UND
;
2034 /* Return negative value to differentiate return code */
2039 * Using the session list, filled a lttng_session array to send back to the
2040 * client for session listing.
2042 * The session list lock MUST be acquired before calling this function. Use
2043 * session_lock_list() and session_unlock_list().
2045 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2050 struct ltt_session
*session
;
2051 struct ltt_session_list
*list
= session_get_list();
2053 DBG("Getting all available session for UID %d GID %d",
2056 * Iterate over session list and append data after the control struct in
2059 cds_list_for_each_entry(session
, &list
->head
, list
) {
2061 * Only list the sessions the user can control.
2063 if (!session_access_ok(session
, uid
, gid
)) {
2067 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2068 struct ltt_ust_session
*usess
= session
->ust_session
;
2070 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2071 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2072 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2073 ret
= build_network_session_path(sessions
[i
].path
,
2074 sizeof(session
[i
].path
), session
);
2076 ret
= snprintf(sessions
[i
].path
, sizeof(session
[i
].path
), "%s",
2077 session
->consumer
->dst
.trace_path
);
2080 PERROR("snprintf session path");
2084 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2085 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2086 sessions
[i
].enabled
= session
->enabled
;
2092 * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
2094 int cmd_disable_consumer(int domain
, struct ltt_session
*session
)
2097 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2098 struct ltt_ust_session
*usess
= session
->ust_session
;
2099 struct consumer_output
*consumer
;
2103 if (session
->enabled
) {
2104 /* Can't disable consumer on an already started session */
2105 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2109 if (!session
->start_consumer
) {
2110 ret
= LTTNG_ERR_NO_CONSUMER
;
2116 DBG("Disable tracing session %s consumer", session
->name
);
2117 consumer
= session
->consumer
;
2119 case LTTNG_DOMAIN_KERNEL
:
2120 /* Code flow error if we don't have a kernel session here. */
2123 DBG("Disabling kernel consumer");
2124 consumer
= ksess
->consumer
;
2127 case LTTNG_DOMAIN_UST
:
2128 /* Code flow error if we don't have a UST session here. */
2131 DBG("Disabling UST consumer");
2132 consumer
= usess
->consumer
;
2136 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2141 consumer
->enabled
= 0;
2142 /* Success at this point */
2145 ret
= LTTNG_ERR_NO_CONSUMER
;
2153 * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
2155 int cmd_enable_consumer(int domain
, struct ltt_session
*session
)
2158 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2159 struct ltt_ust_session
*usess
= session
->ust_session
;
2160 struct consumer_output
*consumer
= NULL
;
2164 /* Can't enable consumer after session started. */
2165 if (session
->enabled
) {
2166 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2172 assert(session
->consumer
);
2173 consumer
= session
->consumer
;
2175 case LTTNG_DOMAIN_KERNEL
:
2176 /* Code flow error if we don't have a kernel session here. */
2180 * Check if we have already sent fds to the consumer. In that case,
2181 * the enable-consumer command can't be used because a start trace
2182 * had previously occured.
2184 if (ksess
->consumer_fds_sent
) {
2185 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2189 consumer
= ksess
->tmp_consumer
;
2190 if (consumer
== NULL
) {
2192 /* No temp. consumer output exists. Using the current one. */
2193 DBG3("No temporary consumer. Using default");
2194 consumer
= ksess
->consumer
;
2198 switch (consumer
->type
) {
2199 case CONSUMER_DST_LOCAL
:
2200 DBG2("Consumer output is local. Creating directory(ies)");
2202 /* Create directory(ies) */
2203 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2204 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2206 if (ret
!= -EEXIST
) {
2207 ERR("Trace directory creation error");
2208 ret
= LTTNG_ERR_FATAL
;
2213 case CONSUMER_DST_NET
:
2214 DBG2("Consumer output is network. Validating URIs");
2215 /* Validate if we have both control and data path set. */
2216 if (!consumer
->dst
.net
.control_isset
) {
2217 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2221 if (!consumer
->dst
.net
.data_isset
) {
2222 ret
= LTTNG_ERR_URL_DATA_MISS
;
2226 /* Check established network session state */
2227 if (session
->net_handle
== 0) {
2228 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2229 ERR("Session network handle is not set on enable-consumer");
2238 * This is race free for now since the session lock is acquired before
2239 * ending up in this function. No other threads can access this kernel
2240 * session without this lock hence freeing the consumer output object
2244 /* Destroy current consumer. We are about to replace it */
2245 consumer_destroy_output(ksess
->consumer
);
2247 ksess
->consumer
= consumer
;
2248 ksess
->tmp_consumer
= NULL
;
2251 case LTTNG_DOMAIN_UST
:
2252 /* Code flow error if we don't have a UST session here. */
2256 * Check if we have already sent fds to the consumer. In that case,
2257 * the enable-consumer command can't be used because a start trace
2258 * had previously occured.
2260 if (usess
->start_trace
) {
2261 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2265 consumer
= usess
->tmp_consumer
;
2266 if (consumer
== NULL
) {
2268 /* No temp. consumer output exists. Using the current one. */
2269 DBG3("No temporary consumer. Using default");
2270 consumer
= usess
->consumer
;
2274 switch (consumer
->type
) {
2275 case CONSUMER_DST_LOCAL
:
2276 DBG2("Consumer output is local. Creating directory(ies)");
2278 /* Create directory(ies) */
2279 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2280 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2282 if (ret
!= -EEXIST
) {
2283 ERR("Trace directory creation error");
2284 ret
= LTTNG_ERR_FATAL
;
2289 case CONSUMER_DST_NET
:
2290 DBG2("Consumer output is network. Validating URIs");
2291 /* Validate if we have both control and data path set. */
2292 if (!consumer
->dst
.net
.control_isset
) {
2293 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2297 if (!consumer
->dst
.net
.data_isset
) {
2298 ret
= LTTNG_ERR_URL_DATA_MISS
;
2302 /* Check established network session state */
2303 if (session
->net_handle
== 0) {
2304 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2305 DBG2("Session network handle is not set on enable-consumer");
2309 if (consumer
->net_seq_index
== -1) {
2310 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2311 DBG2("Network index is not set on the consumer");
2320 * This is race free for now since the session lock is acquired before
2321 * ending up in this function. No other threads can access this kernel
2322 * session without this lock hence freeing the consumer output object
2326 /* Destroy current consumer. We are about to replace it */
2327 consumer_destroy_output(usess
->consumer
);
2329 usess
->consumer
= consumer
;
2330 usess
->tmp_consumer
= NULL
;
2335 session
->start_consumer
= 1;
2339 consumer
->enabled
= 1;
2340 /* Success at this point */
2343 /* Should not really happend... */
2344 ret
= LTTNG_ERR_NO_CONSUMER
;
2352 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2353 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2355 int cmd_data_pending(struct ltt_session
*session
)
2358 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2359 struct ltt_ust_session
*usess
= session
->ust_session
;
2363 /* Session MUST be stopped to ask for data availability. */
2364 if (session
->enabled
) {
2365 ret
= LTTNG_ERR_SESSION_STARTED
;
2369 if (ksess
&& ksess
->consumer
) {
2370 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2372 /* Data is still being extracted for the kernel. */
2377 if (usess
&& usess
->consumer
) {
2378 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2380 /* Data is still being extracted for the kernel. */
2385 /* Data is ready to be read by a viewer */
2393 * Init command subsystem.
2398 * Set network sequence index to 1 for streams to match a relayd socket on
2399 * the consumer side.
2401 uatomic_set(&relayd_net_seq_idx
, 1);
2403 DBG("Command subsystem initialized");