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 * Start a kernel session by opening all necessary streams.
676 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
679 struct ltt_kernel_channel
*kchan
;
681 /* Open kernel metadata */
682 if (ksess
->metadata
== NULL
) {
683 ret
= kernel_open_metadata(ksess
);
685 ret
= LTTNG_ERR_KERN_META_FAIL
;
690 /* Open kernel metadata stream */
691 if (ksess
->metadata_stream_fd
< 0) {
692 ret
= kernel_open_metadata_stream(ksess
);
694 ERR("Kernel create metadata stream failed");
695 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
700 /* For each channel */
701 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
702 if (kchan
->stream_count
== 0) {
703 ret
= kernel_open_channel_stream(kchan
);
705 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
708 /* Update the stream global counter */
709 ksess
->stream_count_global
+= ret
;
713 /* Setup kernel consumer socket and send fds to it */
714 ret
= init_kernel_tracing(ksess
);
716 ret
= LTTNG_ERR_KERN_START_FAIL
;
720 /* This start the kernel tracing */
721 ret
= kernel_start_session(ksess
);
723 ret
= LTTNG_ERR_KERN_START_FAIL
;
727 /* Quiescent wait after starting trace */
728 kernel_wait_quiescent(wpipe
);
739 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
741 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
745 struct ltt_ust_session
*usess
;
747 usess
= session
->ust_session
;
750 case LTTNG_DOMAIN_KERNEL
:
752 ret
= channel_kernel_disable(session
->kernel_session
,
754 if (ret
!= LTTNG_OK
) {
758 kernel_wait_quiescent(kernel_tracer_fd
);
761 case LTTNG_DOMAIN_UST
:
763 struct ltt_ust_channel
*uchan
;
764 struct lttng_ht
*chan_ht
;
766 chan_ht
= usess
->domain_global
.channels
;
768 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
770 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
774 ret
= channel_ust_disable(usess
, domain
, uchan
);
775 if (ret
!= LTTNG_OK
) {
781 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
782 case LTTNG_DOMAIN_UST_EXEC_NAME
:
783 case LTTNG_DOMAIN_UST_PID
:
786 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
797 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
799 * The wpipe arguments is used as a notifier for the kernel thread.
801 int cmd_enable_channel(struct ltt_session
*session
,
802 int domain
, struct lttng_channel
*attr
, int wpipe
)
805 struct ltt_ust_session
*usess
= session
->ust_session
;
806 struct lttng_ht
*chan_ht
;
811 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
814 case LTTNG_DOMAIN_KERNEL
:
816 struct ltt_kernel_channel
*kchan
;
818 /* Mandatory for a kernel channel. */
821 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
822 session
->kernel_session
);
824 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
826 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
829 if (ret
!= LTTNG_OK
) {
833 kernel_wait_quiescent(wpipe
);
836 * If the session was previously started, start as well this newly
837 * created kernel session so the events/channels enabled *after* the
838 * start actually work.
840 if (session
->started
&& !session
->kernel_session
->started
) {
841 ret
= start_kernel_session(session
->kernel_session
, wpipe
);
842 if (ret
!= LTTNG_OK
) {
848 case LTTNG_DOMAIN_UST
:
850 struct ltt_ust_channel
*uchan
;
852 chan_ht
= usess
->domain_global
.channels
;
854 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
856 ret
= channel_ust_create(usess
, domain
, attr
);
858 ret
= channel_ust_enable(usess
, domain
, uchan
);
861 /* Start the UST session if the session was already started. */
862 if (session
->started
&& !usess
->start_trace
) {
863 ret
= ust_app_start_trace_all(usess
);
865 ret
= LTTNG_ERR_UST_START_FAIL
;
869 usess
->start_trace
= 1;
874 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
875 case LTTNG_DOMAIN_UST_EXEC_NAME
:
876 case LTTNG_DOMAIN_UST_PID
:
879 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
889 * Command LTTNG_DISABLE_EVENT processed by the client thread.
891 int cmd_disable_event(struct ltt_session
*session
, int domain
,
892 char *channel_name
, char *event_name
)
897 case LTTNG_DOMAIN_KERNEL
:
899 struct ltt_kernel_channel
*kchan
;
900 struct ltt_kernel_session
*ksess
;
902 ksess
= session
->kernel_session
;
904 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
906 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
910 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
911 if (ret
!= LTTNG_OK
) {
915 kernel_wait_quiescent(kernel_tracer_fd
);
918 case LTTNG_DOMAIN_UST
:
920 struct ltt_ust_channel
*uchan
;
921 struct ltt_ust_session
*usess
;
923 usess
= session
->ust_session
;
925 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
928 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
932 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
933 if (ret
!= LTTNG_OK
) {
937 DBG3("Disable UST event %s in channel %s completed", event_name
,
942 case LTTNG_DOMAIN_UST_EXEC_NAME
:
943 case LTTNG_DOMAIN_UST_PID
:
944 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
958 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
960 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
966 case LTTNG_DOMAIN_KERNEL
:
968 struct ltt_kernel_session
*ksess
;
969 struct ltt_kernel_channel
*kchan
;
971 ksess
= session
->kernel_session
;
973 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
975 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
979 ret
= event_kernel_disable_all(ksess
, kchan
);
980 if (ret
!= LTTNG_OK
) {
984 kernel_wait_quiescent(kernel_tracer_fd
);
987 case LTTNG_DOMAIN_UST
:
989 struct ltt_ust_session
*usess
;
990 struct ltt_ust_channel
*uchan
;
992 usess
= session
->ust_session
;
994 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
997 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1001 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
1006 DBG3("Disable all UST events in channel %s completed", channel_name
);
1011 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1012 case LTTNG_DOMAIN_UST_PID
:
1013 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1016 ret
= LTTNG_ERR_UND
;
1027 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1029 int cmd_add_context(struct ltt_session
*session
, int domain
,
1030 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
,
1036 case LTTNG_DOMAIN_KERNEL
:
1037 assert(session
->kernel_session
);
1039 if (session
->kernel_session
->channel_count
== 0) {
1040 /* Create default channel */
1041 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1042 if (ret
!= LTTNG_OK
) {
1047 /* Add kernel context to kernel tracer */
1048 ret
= context_kernel_add(session
->kernel_session
, ctx
,
1049 event_name
, channel_name
);
1050 if (ret
!= LTTNG_OK
) {
1054 case LTTNG_DOMAIN_UST
:
1056 struct ltt_ust_session
*usess
= session
->ust_session
;
1059 unsigned int chan_count
=
1060 lttng_ht_get_count(usess
->domain_global
.channels
);
1061 if (chan_count
== 0) {
1062 struct lttng_channel
*attr
;
1063 /* Create default channel */
1064 attr
= channel_new_default_attr(domain
);
1066 ret
= LTTNG_ERR_FATAL
;
1070 ret
= channel_ust_create(usess
, domain
, attr
);
1071 if (ret
!= LTTNG_OK
) {
1079 ret
= context_ust_add(usess
, domain
, ctx
, event_name
, channel_name
);
1080 if (ret
!= LTTNG_OK
) {
1086 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1087 case LTTNG_DOMAIN_UST_PID
:
1088 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1091 ret
= LTTNG_ERR_UND
;
1102 * Command LTTNG_SET_FILTER processed by the client thread.
1104 int cmd_set_filter(struct ltt_session
*session
, int domain
,
1105 char *channel_name
, char *event_name
,
1106 struct lttng_filter_bytecode
*bytecode
)
1111 case LTTNG_DOMAIN_KERNEL
:
1112 ret
= LTTNG_ERR_FATAL
;
1114 case LTTNG_DOMAIN_UST
:
1116 struct ltt_ust_session
*usess
= session
->ust_session
;
1118 ret
= filter_ust_set(usess
, domain
, bytecode
, event_name
, channel_name
);
1119 if (ret
!= LTTNG_OK
) {
1125 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1126 case LTTNG_DOMAIN_UST_PID
:
1127 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1130 ret
= LTTNG_ERR_UND
;
1143 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1145 int cmd_enable_event(struct ltt_session
*session
, int domain
,
1146 char *channel_name
, struct lttng_event
*event
, int wpipe
)
1149 struct lttng_channel
*attr
;
1153 assert(channel_name
);
1156 case LTTNG_DOMAIN_KERNEL
:
1158 struct ltt_kernel_channel
*kchan
;
1160 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1161 session
->kernel_session
);
1162 if (kchan
== NULL
) {
1163 attr
= channel_new_default_attr(domain
);
1165 ret
= LTTNG_ERR_FATAL
;
1168 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1170 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1171 if (ret
!= LTTNG_OK
) {
1178 /* Get the newly created kernel channel pointer */
1179 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1180 session
->kernel_session
);
1181 if (kchan
== NULL
) {
1182 /* This sould not happen... */
1183 ret
= LTTNG_ERR_FATAL
;
1187 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
1189 if (ret
!= LTTNG_OK
) {
1193 kernel_wait_quiescent(kernel_tracer_fd
);
1196 case LTTNG_DOMAIN_UST
:
1198 struct ltt_ust_channel
*uchan
;
1199 struct ltt_ust_session
*usess
= session
->ust_session
;
1203 /* Get channel from global UST domain */
1204 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1206 if (uchan
== NULL
) {
1207 /* Create default channel */
1208 attr
= channel_new_default_attr(domain
);
1210 ret
= LTTNG_ERR_FATAL
;
1213 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1215 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1216 if (ret
!= LTTNG_OK
) {
1222 /* Get the newly created channel reference back */
1223 uchan
= trace_ust_find_channel_by_name(
1224 usess
->domain_global
.channels
, channel_name
);
1228 /* At this point, the session and channel exist on the tracer */
1229 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
);
1230 if (ret
!= LTTNG_OK
) {
1236 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1237 case LTTNG_DOMAIN_UST_PID
:
1238 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1241 ret
= LTTNG_ERR_UND
;
1252 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1254 int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
1255 char *channel_name
, int event_type
, int wpipe
)
1258 struct lttng_channel
*attr
;
1261 assert(channel_name
);
1264 case LTTNG_DOMAIN_KERNEL
:
1266 struct ltt_kernel_channel
*kchan
;
1268 assert(session
->kernel_session
);
1270 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1271 session
->kernel_session
);
1272 if (kchan
== NULL
) {
1273 /* Create default channel */
1274 attr
= channel_new_default_attr(domain
);
1276 ret
= LTTNG_ERR_FATAL
;
1279 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1281 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1282 if (ret
!= LTTNG_OK
) {
1288 /* Get the newly created kernel channel pointer */
1289 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1290 session
->kernel_session
);
1294 switch (event_type
) {
1295 case LTTNG_EVENT_SYSCALL
:
1296 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
1297 kchan
, kernel_tracer_fd
);
1299 case LTTNG_EVENT_TRACEPOINT
:
1301 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1302 * events already registered to the channel.
1304 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
1305 kchan
, kernel_tracer_fd
);
1307 case LTTNG_EVENT_ALL
:
1308 /* Enable syscalls and tracepoints */
1309 ret
= event_kernel_enable_all(session
->kernel_session
,
1310 kchan
, kernel_tracer_fd
);
1313 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1317 /* Manage return value */
1318 if (ret
!= LTTNG_OK
) {
1322 kernel_wait_quiescent(kernel_tracer_fd
);
1325 case LTTNG_DOMAIN_UST
:
1327 struct ltt_ust_channel
*uchan
;
1328 struct ltt_ust_session
*usess
= session
->ust_session
;
1332 /* Get channel from global UST domain */
1333 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1335 if (uchan
== NULL
) {
1336 /* Create default channel */
1337 attr
= channel_new_default_attr(domain
);
1339 ret
= LTTNG_ERR_FATAL
;
1342 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1344 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1345 if (ret
!= LTTNG_OK
) {
1351 /* Get the newly created channel reference back */
1352 uchan
= trace_ust_find_channel_by_name(
1353 usess
->domain_global
.channels
, channel_name
);
1357 /* At this point, the session and channel exist on the tracer */
1359 switch (event_type
) {
1360 case LTTNG_EVENT_ALL
:
1361 case LTTNG_EVENT_TRACEPOINT
:
1362 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
);
1363 if (ret
!= LTTNG_OK
) {
1368 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1372 /* Manage return value */
1373 if (ret
!= LTTNG_OK
) {
1380 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1381 case LTTNG_DOMAIN_UST_PID
:
1382 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1385 ret
= LTTNG_ERR_UND
;
1397 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1399 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1402 ssize_t nb_events
= 0;
1405 case LTTNG_DOMAIN_KERNEL
:
1406 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1407 if (nb_events
< 0) {
1408 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1412 case LTTNG_DOMAIN_UST
:
1413 nb_events
= ust_app_list_events(events
);
1414 if (nb_events
< 0) {
1415 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1420 ret
= LTTNG_ERR_UND
;
1427 /* Return negative value to differentiate return code */
1432 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1434 ssize_t
cmd_list_tracepoint_fields(int domain
,
1435 struct lttng_event_field
**fields
)
1438 ssize_t nb_fields
= 0;
1441 case LTTNG_DOMAIN_UST
:
1442 nb_fields
= ust_app_list_event_fields(fields
);
1443 if (nb_fields
< 0) {
1444 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1448 case LTTNG_DOMAIN_KERNEL
:
1449 default: /* fall-through */
1450 ret
= LTTNG_ERR_UND
;
1457 /* Return negative value to differentiate return code */
1462 * Command LTTNG_START_TRACE processed by the client thread.
1464 int cmd_start_trace(struct ltt_session
*session
)
1467 struct ltt_kernel_session
*ksession
;
1468 struct ltt_ust_session
*usess
;
1472 /* Ease our life a bit ;) */
1473 ksession
= session
->kernel_session
;
1474 usess
= session
->ust_session
;
1476 if (session
->enabled
) {
1477 /* Already started. */
1478 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1482 session
->enabled
= 1;
1484 ret
= setup_relayd(session
);
1485 if (ret
!= LTTNG_OK
) {
1486 ERR("Error setting up relayd for session %s", session
->name
);
1490 /* Kernel tracing */
1491 if (ksession
!= NULL
) {
1492 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1493 if (ret
!= LTTNG_OK
) {
1498 /* Flag session that trace should start automatically */
1500 usess
->start_trace
= 1;
1502 ret
= ust_app_start_trace_all(usess
);
1504 ret
= LTTNG_ERR_UST_START_FAIL
;
1509 session
->started
= 1;
1518 * Command LTTNG_STOP_TRACE processed by the client thread.
1520 int cmd_stop_trace(struct ltt_session
*session
)
1523 struct ltt_kernel_channel
*kchan
;
1524 struct ltt_kernel_session
*ksession
;
1525 struct ltt_ust_session
*usess
;
1530 ksession
= session
->kernel_session
;
1531 usess
= session
->ust_session
;
1533 if (!session
->enabled
) {
1534 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1538 session
->enabled
= 0;
1542 DBG("Stop kernel tracing");
1544 /* Flush metadata if exist */
1545 if (ksession
->metadata_stream_fd
>= 0) {
1546 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1548 ERR("Kernel metadata flush failed");
1552 /* Flush all buffers before stopping */
1553 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1554 ret
= kernel_flush_buffer(kchan
);
1556 ERR("Kernel flush buffer error");
1560 ret
= kernel_stop_session(ksession
);
1562 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1566 kernel_wait_quiescent(kernel_tracer_fd
);
1568 ksession
->started
= 0;
1572 usess
->start_trace
= 0;
1574 ret
= ust_app_stop_trace_all(usess
);
1576 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1581 session
->started
= 0;
1590 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1592 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1593 size_t nb_uri
, struct lttng_uri
*uris
)
1596 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1597 struct ltt_ust_session
*usess
= session
->ust_session
;
1598 struct consumer_output
*consumer
= NULL
;
1604 /* Can't enable consumer after session started. */
1605 if (session
->enabled
) {
1606 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1611 * This case switch makes sure the domain session has a temporary consumer
1612 * so the URL can be set.
1616 /* Code flow error. A session MUST always have a consumer object */
1617 assert(session
->consumer
);
1619 * The URL will be added to the tracing session consumer instead of a
1620 * specific domain consumer.
1622 consumer
= session
->consumer
;
1624 case LTTNG_DOMAIN_KERNEL
:
1625 /* Code flow error if we don't have a kernel session here. */
1628 /* Create consumer output if none exists */
1629 consumer
= ksess
->tmp_consumer
;
1630 if (consumer
== NULL
) {
1631 consumer
= consumer_copy_output(ksess
->consumer
);
1632 if (consumer
== NULL
) {
1633 ret
= LTTNG_ERR_FATAL
;
1636 /* Trash the consumer subdir, we are about to set a new one. */
1637 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1638 ksess
->tmp_consumer
= consumer
;
1642 case LTTNG_DOMAIN_UST
:
1643 /* Code flow error if we don't have a kernel session here. */
1646 /* Create consumer output if none exists */
1647 consumer
= usess
->tmp_consumer
;
1648 if (consumer
== NULL
) {
1649 consumer
= consumer_copy_output(usess
->consumer
);
1650 if (consumer
== NULL
) {
1651 ret
= LTTNG_ERR_FATAL
;
1654 /* Trash the consumer subdir, we are about to set a new one. */
1655 memset(consumer
->subdir
, 0, sizeof(consumer
->subdir
));
1656 usess
->tmp_consumer
= consumer
;
1662 for (i
= 0; i
< nb_uri
; i
++) {
1663 struct consumer_socket
*socket
;
1664 struct lttng_ht_iter iter
;
1666 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1672 * Don't send relayd socket if URI is NOT remote or if the relayd
1673 * socket for the session was already sent.
1675 if (uris
[i
].dtype
== LTTNG_DST_PATH
||
1676 (uris
[i
].stype
== LTTNG_STREAM_CONTROL
&&
1677 consumer
->dst
.net
.control_sock_sent
) ||
1678 (uris
[i
].stype
== LTTNG_STREAM_DATA
&&
1679 consumer
->dst
.net
.data_sock_sent
)) {
1683 /* Try to send relayd URI to the consumer if exist. */
1685 cds_lfht_for_each_entry(consumer
->socks
->ht
, &iter
.iter
,
1686 socket
, node
.node
) {
1688 /* A socket in the HT should never have a negative fd */
1689 assert(socket
->fd
>= 0);
1691 pthread_mutex_lock(socket
->lock
);
1692 ret
= send_consumer_relayd_socket(domain
, session
, &uris
[i
],
1693 consumer
, socket
->fd
);
1694 pthread_mutex_unlock(socket
->lock
);
1695 if (ret
!= LTTNG_OK
) {
1711 * Command LTTNG_CREATE_SESSION processed by the client thread.
1713 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1714 size_t nb_uri
, lttng_sock_cred
*creds
)
1718 struct ltt_session
*session
;
1723 * Verify if the session already exist
1725 * XXX: There is no need for the session lock list here since the caller
1726 * (process_client_msg) is holding it. We might want to change that so a
1727 * single command does not lock the entire session list.
1729 session
= session_find_by_name(name
);
1730 if (session
!= NULL
) {
1731 ret
= LTTNG_ERR_EXIST_SESS
;
1735 /* Create tracing session in the registry */
1736 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
1737 LTTNG_SOCK_GET_GID_CRED(creds
));
1738 if (ret
!= LTTNG_OK
) {
1743 * Get the newly created session pointer back
1745 * XXX: There is no need for the session lock list here since the caller
1746 * (process_client_msg) is holding it. We might want to change that so a
1747 * single command does not lock the entire session list.
1749 session
= session_find_by_name(name
);
1752 /* Create default consumer output for the session not yet created. */
1753 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1754 if (session
->consumer
== NULL
) {
1755 ret
= LTTNG_ERR_FATAL
;
1756 goto consumer_error
;
1760 * This means that the lttng_create_session call was called with the _path_
1761 * argument set to NULL.
1765 * At this point, we'll skip the consumer URI setup and create a
1766 * session with a NULL path which will flag the session to NOT spawn a
1769 DBG("Create session %s with NO uri, skipping consumer setup", name
);
1773 session
->start_consumer
= 1;
1775 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1776 if (ret
!= LTTNG_OK
) {
1777 goto consumer_error
;
1780 session
->consumer
->enabled
= 1;
1786 session_destroy(session
);
1793 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1795 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1798 struct ltt_ust_session
*usess
;
1799 struct ltt_kernel_session
*ksess
;
1804 usess
= session
->ust_session
;
1805 ksess
= session
->kernel_session
;
1807 /* Clean kernel session teardown */
1808 kernel_destroy_session(ksess
);
1810 /* UST session teardown */
1812 /* Close any relayd session */
1813 consumer_output_send_destroy_relayd(usess
->consumer
);
1815 /* Destroy every UST application related to this session. */
1816 ret
= ust_app_destroy_trace_all(usess
);
1818 ERR("Error in ust_app_destroy_trace_all");
1821 /* Clean up the rest. */
1822 trace_ust_destroy_session(usess
);
1826 * Must notify the kernel thread here to update it's poll set in order to
1827 * remove the channel(s)' fd just destroyed.
1829 ret
= notify_thread_pipe(wpipe
);
1831 PERROR("write kernel poll pipe");
1834 ret
= session_destroy(session
);
1840 * Command LTTNG_CALIBRATE processed by the client thread.
1842 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1847 case LTTNG_DOMAIN_KERNEL
:
1849 struct lttng_kernel_calibrate kcalibrate
;
1851 kcalibrate
.type
= calibrate
->type
;
1852 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1854 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1859 case LTTNG_DOMAIN_UST
:
1861 struct lttng_ust_calibrate ucalibrate
;
1863 ucalibrate
.type
= calibrate
->type
;
1864 ret
= ust_app_calibrate_glb(&ucalibrate
);
1866 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1872 ret
= LTTNG_ERR_UND
;
1883 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1885 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1886 const char *sock_path
, struct consumer_data
*cdata
)
1889 struct consumer_socket
*socket
;
1896 case LTTNG_DOMAIN_KERNEL
:
1898 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1902 /* Can't register a consumer if there is already one */
1903 if (ksess
->consumer_fds_sent
!= 0) {
1904 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1908 sock
= lttcomm_connect_unix_sock(sock_path
);
1910 ret
= LTTNG_ERR_CONNECT_FAIL
;
1914 socket
= consumer_allocate_socket(sock
);
1915 if (socket
== NULL
) {
1916 ret
= LTTNG_ERR_FATAL
;
1921 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1922 if (socket
->lock
== NULL
) {
1923 PERROR("zmalloc pthread mutex");
1924 ret
= LTTNG_ERR_FATAL
;
1927 pthread_mutex_init(socket
->lock
, NULL
);
1928 socket
->registered
= 1;
1931 consumer_add_socket(socket
, ksess
->consumer
);
1934 pthread_mutex_lock(&cdata
->pid_mutex
);
1936 pthread_mutex_unlock(&cdata
->pid_mutex
);
1941 /* TODO: Userspace tracing */
1942 ret
= LTTNG_ERR_UND
;
1953 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1955 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1956 struct lttng_domain
**domains
)
1961 if (session
->kernel_session
!= NULL
) {
1962 DBG3("Listing domains found kernel domain");
1966 if (session
->ust_session
!= NULL
) {
1967 DBG3("Listing domains found UST global domain");
1971 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1972 if (*domains
== NULL
) {
1973 ret
= LTTNG_ERR_FATAL
;
1977 if (session
->kernel_session
!= NULL
) {
1978 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1982 if (session
->ust_session
!= NULL
) {
1983 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1990 /* Return negative value to differentiate return code */
1996 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1998 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1999 struct lttng_channel
**channels
)
2002 ssize_t nb_chan
= 0;
2005 case LTTNG_DOMAIN_KERNEL
:
2006 if (session
->kernel_session
!= NULL
) {
2007 nb_chan
= session
->kernel_session
->channel_count
;
2009 DBG3("Number of kernel channels %zd", nb_chan
);
2011 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
2014 case LTTNG_DOMAIN_UST
:
2015 if (session
->ust_session
!= NULL
) {
2016 nb_chan
= lttng_ht_get_count(
2017 session
->ust_session
->domain_global
.channels
);
2019 DBG3("Number of UST global channels %zd", nb_chan
);
2021 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2026 ret
= LTTNG_ERR_UND
;
2031 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2032 if (*channels
== NULL
) {
2033 ret
= LTTNG_ERR_FATAL
;
2037 list_lttng_channels(domain
, session
, *channels
);
2040 /* Ret value was set in the domain switch case */
2047 /* Return negative value to differentiate return code */
2052 * Command LTTNG_LIST_EVENTS processed by the client thread.
2054 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2055 char *channel_name
, struct lttng_event
**events
)
2058 ssize_t nb_event
= 0;
2061 case LTTNG_DOMAIN_KERNEL
:
2062 if (session
->kernel_session
!= NULL
) {
2063 nb_event
= list_lttng_kernel_events(channel_name
,
2064 session
->kernel_session
, events
);
2067 case LTTNG_DOMAIN_UST
:
2069 if (session
->ust_session
!= NULL
) {
2070 nb_event
= list_lttng_ust_global_events(channel_name
,
2071 &session
->ust_session
->domain_global
, events
);
2076 ret
= LTTNG_ERR_UND
;
2083 /* Return negative value to differentiate return code */
2088 * Using the session list, filled a lttng_session array to send back to the
2089 * client for session listing.
2091 * The session list lock MUST be acquired before calling this function. Use
2092 * session_lock_list() and session_unlock_list().
2094 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2099 struct ltt_session
*session
;
2100 struct ltt_session_list
*list
= session_get_list();
2102 DBG("Getting all available session for UID %d GID %d",
2105 * Iterate over session list and append data after the control struct in
2108 cds_list_for_each_entry(session
, &list
->head
, list
) {
2110 * Only list the sessions the user can control.
2112 if (!session_access_ok(session
, uid
, gid
)) {
2116 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2117 struct ltt_ust_session
*usess
= session
->ust_session
;
2119 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2120 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2121 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2122 ret
= build_network_session_path(sessions
[i
].path
,
2123 sizeof(session
[i
].path
), session
);
2125 ret
= snprintf(sessions
[i
].path
, sizeof(session
[i
].path
), "%s",
2126 session
->consumer
->dst
.trace_path
);
2129 PERROR("snprintf session path");
2133 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2134 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2135 sessions
[i
].enabled
= session
->enabled
;
2141 * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
2143 int cmd_disable_consumer(int domain
, struct ltt_session
*session
)
2146 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2147 struct ltt_ust_session
*usess
= session
->ust_session
;
2148 struct consumer_output
*consumer
;
2152 if (session
->enabled
) {
2153 /* Can't disable consumer on an already started session */
2154 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2158 if (!session
->start_consumer
) {
2159 ret
= LTTNG_ERR_NO_CONSUMER
;
2165 DBG("Disable tracing session %s consumer", session
->name
);
2166 consumer
= session
->consumer
;
2168 case LTTNG_DOMAIN_KERNEL
:
2169 /* Code flow error if we don't have a kernel session here. */
2172 DBG("Disabling kernel consumer");
2173 consumer
= ksess
->consumer
;
2176 case LTTNG_DOMAIN_UST
:
2177 /* Code flow error if we don't have a UST session here. */
2180 DBG("Disabling UST consumer");
2181 consumer
= usess
->consumer
;
2185 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2190 consumer
->enabled
= 0;
2191 /* Success at this point */
2194 ret
= LTTNG_ERR_NO_CONSUMER
;
2202 * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
2204 int cmd_enable_consumer(int domain
, struct ltt_session
*session
)
2207 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2208 struct ltt_ust_session
*usess
= session
->ust_session
;
2209 struct consumer_output
*consumer
= NULL
;
2213 /* Can't enable consumer after session started. */
2214 if (session
->enabled
) {
2215 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2221 assert(session
->consumer
);
2222 consumer
= session
->consumer
;
2224 case LTTNG_DOMAIN_KERNEL
:
2225 /* Code flow error if we don't have a kernel session here. */
2229 * Check if we have already sent fds to the consumer. In that case,
2230 * the enable-consumer command can't be used because a start trace
2231 * had previously occured.
2233 if (ksess
->consumer_fds_sent
) {
2234 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2238 consumer
= ksess
->tmp_consumer
;
2239 if (consumer
== NULL
) {
2241 /* No temp. consumer output exists. Using the current one. */
2242 DBG3("No temporary consumer. Using default");
2243 consumer
= ksess
->consumer
;
2247 switch (consumer
->type
) {
2248 case CONSUMER_DST_LOCAL
:
2249 DBG2("Consumer output is local. Creating directory(ies)");
2251 /* Create directory(ies) */
2252 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2253 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2255 if (ret
!= -EEXIST
) {
2256 ERR("Trace directory creation error");
2257 ret
= LTTNG_ERR_FATAL
;
2262 case CONSUMER_DST_NET
:
2263 DBG2("Consumer output is network. Validating URIs");
2264 /* Validate if we have both control and data path set. */
2265 if (!consumer
->dst
.net
.control_isset
) {
2266 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2270 if (!consumer
->dst
.net
.data_isset
) {
2271 ret
= LTTNG_ERR_URL_DATA_MISS
;
2275 /* Check established network session state */
2276 if (session
->net_handle
== 0) {
2277 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2278 ERR("Session network handle is not set on enable-consumer");
2287 * This is race free for now since the session lock is acquired before
2288 * ending up in this function. No other threads can access this kernel
2289 * session without this lock hence freeing the consumer output object
2293 /* Destroy current consumer. We are about to replace it */
2294 consumer_destroy_output(ksess
->consumer
);
2296 ksess
->consumer
= consumer
;
2297 ksess
->tmp_consumer
= NULL
;
2300 case LTTNG_DOMAIN_UST
:
2301 /* Code flow error if we don't have a UST session here. */
2305 * Check if we have already sent fds to the consumer. In that case,
2306 * the enable-consumer command can't be used because a start trace
2307 * had previously occured.
2309 if (usess
->start_trace
) {
2310 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2314 consumer
= usess
->tmp_consumer
;
2315 if (consumer
== NULL
) {
2317 /* No temp. consumer output exists. Using the current one. */
2318 DBG3("No temporary consumer. Using default");
2319 consumer
= usess
->consumer
;
2323 switch (consumer
->type
) {
2324 case CONSUMER_DST_LOCAL
:
2325 DBG2("Consumer output is local. Creating directory(ies)");
2327 /* Create directory(ies) */
2328 ret
= run_as_mkdir_recursive(consumer
->dst
.trace_path
,
2329 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2331 if (ret
!= -EEXIST
) {
2332 ERR("Trace directory creation error");
2333 ret
= LTTNG_ERR_FATAL
;
2338 case CONSUMER_DST_NET
:
2339 DBG2("Consumer output is network. Validating URIs");
2340 /* Validate if we have both control and data path set. */
2341 if (!consumer
->dst
.net
.control_isset
) {
2342 ret
= LTTNG_ERR_URL_CTRL_MISS
;
2346 if (!consumer
->dst
.net
.data_isset
) {
2347 ret
= LTTNG_ERR_URL_DATA_MISS
;
2351 /* Check established network session state */
2352 if (session
->net_handle
== 0) {
2353 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2354 DBG2("Session network handle is not set on enable-consumer");
2358 if (consumer
->net_seq_index
== -1) {
2359 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
2360 DBG2("Network index is not set on the consumer");
2369 * This is race free for now since the session lock is acquired before
2370 * ending up in this function. No other threads can access this kernel
2371 * session without this lock hence freeing the consumer output object
2375 /* Destroy current consumer. We are about to replace it */
2376 consumer_destroy_output(usess
->consumer
);
2378 usess
->consumer
= consumer
;
2379 usess
->tmp_consumer
= NULL
;
2384 session
->start_consumer
= 1;
2388 consumer
->enabled
= 1;
2389 /* Success at this point */
2392 /* Should not really happend... */
2393 ret
= LTTNG_ERR_NO_CONSUMER
;
2401 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2402 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2404 int cmd_data_pending(struct ltt_session
*session
)
2407 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2408 struct ltt_ust_session
*usess
= session
->ust_session
;
2412 /* Session MUST be stopped to ask for data availability. */
2413 if (session
->enabled
) {
2414 ret
= LTTNG_ERR_SESSION_STARTED
;
2418 if (ksess
&& ksess
->consumer
) {
2419 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2421 /* Data is still being extracted for the kernel. */
2426 if (usess
&& usess
->consumer
) {
2427 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2429 /* Data is still being extracted for the kernel. */
2434 /* Data is ready to be read by a viewer */
2442 * Init command subsystem.
2447 * Set network sequence index to 1 for streams to match a relayd socket on
2448 * the consumer side.
2450 uatomic_set(&relayd_net_seq_idx
, 1);
2452 DBG("Command subsystem initialized");