2 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
3 * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com>
6 * SPDX-License-Identifier: GPL-2.0-only
10 #include "common/buffer-view.h"
11 #include "common/compat/socket.h"
12 #include "common/dynamic-buffer.h"
13 #include "common/dynamic-array.h"
14 #include "common/payload.h"
15 #include "common/payload-view.h"
16 #include "common/fd-handle.h"
17 #include "common/sessiond-comm/sessiond-comm.h"
18 #include "common/payload.h"
19 #include "common/payload-view.h"
20 #include "lttng/lttng-error.h"
21 #include "lttng/tracker.h"
22 #include <common/compat/getenv.h>
23 #include <common/tracker.h>
24 #include <common/unix.h>
25 #include <common/utils.h>
26 #include <lttng/event-internal.h>
27 #include <lttng/session-descriptor-internal.h>
28 #include <lttng/session-internal.h>
29 #include <lttng/userspace-probe-internal.h>
37 #include "lttng-sessiond.h"
41 #include "health-sessiond.h"
42 #include "testpoint.h"
44 #include "manage-consumer.h"
49 static struct thread_state
{
55 static void set_thread_status(bool running
)
57 DBG("Marking client thread's state as %s", running
? "running" : "error");
58 thread_state
.running
= running
;
59 sem_post(&thread_state
.ready
);
62 static bool wait_thread_status(void)
64 DBG("Waiting for client thread to be ready");
65 sem_wait(&thread_state
.ready
);
66 if (thread_state
.running
) {
67 DBG("Client thread is ready");
69 ERR("Initialization of client thread failed");
72 return thread_state
.running
;
76 * Setup the outgoing data buffer for the response (llm) by allocating the
77 * right amount of memory and copying the original information from the lsm
80 * Return 0 on success, negative value on error.
82 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
,
83 const void *payload_buf
, size_t payload_len
,
84 const void *cmd_header_buf
, size_t cmd_header_len
)
87 const size_t header_len
= sizeof(struct lttcomm_lttng_msg
);
88 const size_t total_msg_size
= header_len
+ cmd_header_len
+ payload_len
;
89 const struct lttcomm_lttng_msg llm
= {
90 .cmd_type
= cmd_ctx
->lsm
.cmd_type
,
91 .pid
= cmd_ctx
->lsm
.domain
.attr
.pid
,
92 .cmd_header_size
= cmd_header_len
,
93 .data_size
= payload_len
,
96 ret
= lttng_dynamic_buffer_set_size(&cmd_ctx
->reply_payload
.buffer
, 0);
101 lttng_dynamic_pointer_array_clear(&cmd_ctx
->reply_payload
._fd_handles
);
103 cmd_ctx
->lttng_msg_size
= total_msg_size
;
105 /* Append reply header. */
106 ret
= lttng_dynamic_buffer_append(
107 &cmd_ctx
->reply_payload
.buffer
, &llm
, sizeof(llm
));
112 /* Append command header. */
113 if (cmd_header_len
) {
114 ret
= lttng_dynamic_buffer_append(
115 &cmd_ctx
->reply_payload
.buffer
, cmd_header_buf
,
122 /* Append payload. */
124 ret
= lttng_dynamic_buffer_append(
125 &cmd_ctx
->reply_payload
.buffer
, payload_buf
,
136 static int setup_empty_lttng_msg(struct command_ctx
*cmd_ctx
)
139 const struct lttcomm_lttng_msg llm
= {};
141 ret
= lttng_dynamic_buffer_set_size(&cmd_ctx
->reply_payload
.buffer
, 0);
146 /* Append place-holder reply header. */
147 ret
= lttng_dynamic_buffer_append(
148 &cmd_ctx
->reply_payload
.buffer
, &llm
, sizeof(llm
));
153 cmd_ctx
->lttng_msg_size
= sizeof(llm
);
158 static void update_lttng_msg(struct command_ctx
*cmd_ctx
, size_t cmd_header_len
,
161 const size_t header_len
= sizeof(struct lttcomm_lttng_msg
);
162 const size_t total_msg_size
= header_len
+ cmd_header_len
+ payload_len
;
163 const struct lttcomm_lttng_msg llm
= {
164 .cmd_type
= cmd_ctx
->lsm
.cmd_type
,
165 .pid
= cmd_ctx
->lsm
.domain
.attr
.pid
,
166 .cmd_header_size
= cmd_header_len
,
167 .data_size
= payload_len
,
169 struct lttcomm_lttng_msg
*p_llm
;
171 assert(cmd_ctx
->reply_payload
.buffer
.size
>= sizeof(llm
));
173 p_llm
= (typeof(p_llm
)) cmd_ctx
->reply_payload
.buffer
.data
;
175 /* Update existing header. */
176 memcpy(p_llm
, &llm
, sizeof(llm
));
178 cmd_ctx
->lttng_msg_size
= total_msg_size
;
182 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
183 * exec or it will fail.
185 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
187 return launch_consumer_management_thread(consumer_data
) ? 0 : -1;
191 * Fork and exec a consumer daemon (consumerd).
193 * Return pid if successful else -1.
195 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
199 const char *consumer_to_use
;
200 const char *verbosity
;
203 DBG("Spawning consumerd");
210 if (config
.verbose_consumer
) {
211 verbosity
= "--verbose";
212 } else if (lttng_opt_quiet
) {
213 verbosity
= "--quiet";
218 switch (consumer_data
->type
) {
219 case LTTNG_CONSUMER_KERNEL
:
221 * Find out which consumerd to execute. We will first try the
222 * 64-bit path, then the sessiond's installation directory, and
223 * fallback on the 32-bit one,
225 DBG3("Looking for a kernel consumer at these locations:");
226 DBG3(" 1) %s", config
.consumerd64_bin_path
.value
? : "NULL");
227 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, DEFAULT_CONSUMERD_FILE
);
228 DBG3(" 3) %s", config
.consumerd32_bin_path
.value
? : "NULL");
229 if (stat(config
.consumerd64_bin_path
.value
, &st
) == 0) {
230 DBG3("Found location #1");
231 consumer_to_use
= config
.consumerd64_bin_path
.value
;
232 } else if (stat(INSTALL_BIN_PATH
"/" DEFAULT_CONSUMERD_FILE
, &st
) == 0) {
233 DBG3("Found location #2");
234 consumer_to_use
= INSTALL_BIN_PATH
"/" DEFAULT_CONSUMERD_FILE
;
235 } else if (config
.consumerd32_bin_path
.value
&&
236 stat(config
.consumerd32_bin_path
.value
, &st
) == 0) {
237 DBG3("Found location #3");
238 consumer_to_use
= config
.consumerd32_bin_path
.value
;
240 DBG("Could not find any valid consumerd executable");
244 DBG("Using kernel consumer at: %s", consumer_to_use
);
245 (void) execl(consumer_to_use
,
246 "lttng-consumerd", verbosity
, "-k",
247 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
248 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
249 "--group", config
.tracing_group_name
.value
,
252 case LTTNG_CONSUMER64_UST
:
254 if (config
.consumerd64_lib_dir
.value
) {
259 tmp
= lttng_secure_getenv("LD_LIBRARY_PATH");
263 tmplen
= strlen(config
.consumerd64_lib_dir
.value
) + 1 /* : */ + strlen(tmp
);
264 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
269 strcat(tmpnew
, config
.consumerd64_lib_dir
.value
);
270 if (tmp
[0] != '\0') {
274 ret
= setenv("LD_LIBRARY_PATH", tmpnew
, 1);
281 DBG("Using 64-bit UST consumer at: %s", config
.consumerd64_bin_path
.value
);
282 (void) execl(config
.consumerd64_bin_path
.value
, "lttng-consumerd", verbosity
, "-u",
283 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
284 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
285 "--group", config
.tracing_group_name
.value
,
289 case LTTNG_CONSUMER32_UST
:
291 if (config
.consumerd32_lib_dir
.value
) {
296 tmp
= lttng_secure_getenv("LD_LIBRARY_PATH");
300 tmplen
= strlen(config
.consumerd32_lib_dir
.value
) + 1 /* : */ + strlen(tmp
);
301 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
306 strcat(tmpnew
, config
.consumerd32_lib_dir
.value
);
307 if (tmp
[0] != '\0') {
311 ret
= setenv("LD_LIBRARY_PATH", tmpnew
, 1);
318 DBG("Using 32-bit UST consumer at: %s", config
.consumerd32_bin_path
.value
);
319 (void) execl(config
.consumerd32_bin_path
.value
, "lttng-consumerd", verbosity
, "-u",
320 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
321 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
322 "--group", config
.tracing_group_name
.value
,
327 ERR("unknown consumer type");
331 PERROR("Consumer execl()");
333 /* Reaching this point, we got a failure on our execl(). */
335 } else if (pid
> 0) {
338 PERROR("start consumer fork");
346 * Spawn the consumerd daemon and session daemon thread.
348 static int start_consumerd(struct consumer_data
*consumer_data
)
353 * Set the listen() state on the socket since there is a possible race
354 * between the exec() of the consumer daemon and this call if place in the
355 * consumer thread. See bug #366 for more details.
357 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
362 pthread_mutex_lock(&consumer_data
->pid_mutex
);
363 if (consumer_data
->pid
!= 0) {
364 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
368 ret
= spawn_consumerd(consumer_data
);
370 ERR("Spawning consumerd failed");
371 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
375 /* Setting up the consumer_data pid */
376 consumer_data
->pid
= ret
;
377 DBG2("Consumer pid %d", consumer_data
->pid
);
378 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
380 DBG2("Spawning consumer control thread");
381 ret
= spawn_consumer_thread(consumer_data
);
383 ERR("Fatal error spawning consumer control thread");
391 /* Cleanup already created sockets on error. */
392 if (consumer_data
->err_sock
>= 0) {
395 err
= close(consumer_data
->err_sock
);
397 PERROR("close consumer data error socket");
404 * Copy consumer output from the tracing session to the domain session. The
405 * function also applies the right modification on a per domain basis for the
406 * trace files destination directory.
408 * Should *NOT* be called with RCU read-side lock held.
410 static int copy_session_consumer(int domain
, struct ltt_session
*session
)
413 const char *dir_name
;
414 struct consumer_output
*consumer
;
417 assert(session
->consumer
);
420 case LTTNG_DOMAIN_KERNEL
:
421 DBG3("Copying tracing session consumer output in kernel session");
423 * XXX: We should audit the session creation and what this function
424 * does "extra" in order to avoid a destroy since this function is used
425 * in the domain session creation (kernel and ust) only. Same for UST
428 if (session
->kernel_session
->consumer
) {
429 consumer_output_put(session
->kernel_session
->consumer
);
431 session
->kernel_session
->consumer
=
432 consumer_copy_output(session
->consumer
);
433 /* Ease our life a bit for the next part */
434 consumer
= session
->kernel_session
->consumer
;
435 dir_name
= DEFAULT_KERNEL_TRACE_DIR
;
437 case LTTNG_DOMAIN_JUL
:
438 case LTTNG_DOMAIN_LOG4J
:
439 case LTTNG_DOMAIN_PYTHON
:
440 case LTTNG_DOMAIN_UST
:
441 DBG3("Copying tracing session consumer output in UST session");
442 if (session
->ust_session
->consumer
) {
443 consumer_output_put(session
->ust_session
->consumer
);
445 session
->ust_session
->consumer
=
446 consumer_copy_output(session
->consumer
);
447 /* Ease our life a bit for the next part */
448 consumer
= session
->ust_session
->consumer
;
449 dir_name
= DEFAULT_UST_TRACE_DIR
;
452 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
456 /* Append correct directory to subdir */
457 ret
= lttng_strncpy(consumer
->domain_subdir
, dir_name
,
458 sizeof(consumer
->domain_subdir
));
463 DBG3("Copy session consumer subdir %s", consumer
->domain_subdir
);
471 * Create an UST session and add it to the session ust list.
473 * Should *NOT* be called with RCU read-side lock held.
475 static int create_ust_session(struct ltt_session
*session
,
476 const struct lttng_domain
*domain
)
479 struct ltt_ust_session
*lus
= NULL
;
483 assert(session
->consumer
);
485 switch (domain
->type
) {
486 case LTTNG_DOMAIN_JUL
:
487 case LTTNG_DOMAIN_LOG4J
:
488 case LTTNG_DOMAIN_PYTHON
:
489 case LTTNG_DOMAIN_UST
:
492 ERR("Unknown UST domain on create session %d", domain
->type
);
493 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
497 DBG("Creating UST session");
499 lus
= trace_ust_create_session(session
->id
);
501 ret
= LTTNG_ERR_UST_SESS_FAIL
;
505 lus
->uid
= session
->uid
;
506 lus
->gid
= session
->gid
;
507 lus
->output_traces
= session
->output_traces
;
508 lus
->snapshot_mode
= session
->snapshot_mode
;
509 lus
->live_timer_interval
= session
->live_timer
;
510 session
->ust_session
= lus
;
511 if (session
->shm_path
[0]) {
512 strncpy(lus
->root_shm_path
, session
->shm_path
,
513 sizeof(lus
->root_shm_path
));
514 lus
->root_shm_path
[sizeof(lus
->root_shm_path
) - 1] = '\0';
515 strncpy(lus
->shm_path
, session
->shm_path
,
516 sizeof(lus
->shm_path
));
517 lus
->shm_path
[sizeof(lus
->shm_path
) - 1] = '\0';
518 strncat(lus
->shm_path
, "/ust",
519 sizeof(lus
->shm_path
) - strlen(lus
->shm_path
) - 1);
521 /* Copy session output to the newly created UST session */
522 ret
= copy_session_consumer(domain
->type
, session
);
523 if (ret
!= LTTNG_OK
) {
531 session
->ust_session
= NULL
;
536 * Create a kernel tracer session then create the default channel.
538 static int create_kernel_session(struct ltt_session
*session
)
542 DBG("Creating kernel session");
544 ret
= kernel_create_session(session
);
546 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
550 /* Code flow safety */
551 assert(session
->kernel_session
);
553 /* Copy session output to the newly created Kernel session */
554 ret
= copy_session_consumer(LTTNG_DOMAIN_KERNEL
, session
);
555 if (ret
!= LTTNG_OK
) {
559 session
->kernel_session
->uid
= session
->uid
;
560 session
->kernel_session
->gid
= session
->gid
;
561 session
->kernel_session
->output_traces
= session
->output_traces
;
562 session
->kernel_session
->snapshot_mode
= session
->snapshot_mode
;
563 session
->kernel_session
->is_live_session
= session
->live_timer
!= 0;
568 trace_kernel_destroy_session(session
->kernel_session
);
569 session
->kernel_session
= NULL
;
575 * Count number of session permitted by uid/gid.
577 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
580 struct ltt_session
*session
;
581 const struct ltt_session_list
*session_list
= session_get_list();
583 DBG("Counting number of available session for UID %d", uid
);
584 cds_list_for_each_entry(session
, &session_list
->head
, list
) {
585 if (!session_get(session
)) {
588 session_lock(session
);
589 /* Only count the sessions the user can control. */
590 if (session_access_ok(session
, uid
) &&
591 !session
->destroyed
) {
594 session_unlock(session
);
595 session_put(session
);
600 static int receive_userspace_probe(struct command_ctx
*cmd_ctx
, int sock
,
601 int *sock_error
, struct lttng_event
*event
)
604 struct lttng_userspace_probe_location
*probe_location
;
605 struct lttng_payload probe_location_payload
;
606 struct fd_handle
*handle
= NULL
;
609 * Create a payload to store the serialized version of the probe
612 lttng_payload_init(&probe_location_payload
);
614 ret
= lttng_dynamic_buffer_set_size(&probe_location_payload
.buffer
,
615 cmd_ctx
->lsm
.u
.enable
.userspace_probe_location_len
);
617 ret
= LTTNG_ERR_NOMEM
;
622 * Receive the probe location.
624 ret
= lttcomm_recv_unix_sock(sock
, probe_location_payload
.buffer
.data
,
625 probe_location_payload
.buffer
.size
);
627 DBG("Nothing recv() from client var len data... continuing");
629 ret
= LTTNG_ERR_PROBE_LOCATION_INVAL
;
634 * Receive the file descriptor to the target binary from the client.
636 DBG("Receiving userspace probe target FD from client ...");
637 ret
= lttcomm_recv_fds_unix_sock(sock
, &fd
, 1);
639 DBG("Nothing recv() from client userspace probe fd... continuing");
641 ret
= LTTNG_ERR_PROBE_LOCATION_INVAL
;
645 handle
= fd_handle_create(fd
);
647 ret
= LTTNG_ERR_NOMEM
;
651 /* Transferred to the handle. */
654 ret
= lttng_payload_push_fd_handle(&probe_location_payload
, handle
);
656 ERR("Failed to add userspace probe file descriptor to payload");
657 ret
= LTTNG_ERR_NOMEM
;
661 fd_handle_put(handle
);
665 struct lttng_payload_view view
= lttng_payload_view_from_payload(
666 &probe_location_payload
, 0, -1);
668 /* Extract the probe location from the serialized version. */
669 ret
= lttng_userspace_probe_location_create_from_payload(
670 &view
, &probe_location
);
673 WARN("Failed to create a userspace probe location from the received buffer");
674 ret
= LTTNG_ERR_PROBE_LOCATION_INVAL
;
678 /* Attach the probe location to the event. */
679 ret
= lttng_event_set_userspace_probe_location(event
, probe_location
);
681 ret
= LTTNG_ERR_PROBE_LOCATION_INVAL
;
688 PERROR("Failed to close userspace probe location binary fd");
692 fd_handle_put(handle
);
693 lttng_payload_reset(&probe_location_payload
);
698 * Version of setup_lttng_msg() without command header.
700 static int setup_lttng_msg_no_cmd_header(struct command_ctx
*cmd_ctx
,
701 void *payload_buf
, size_t payload_len
)
703 return setup_lttng_msg(cmd_ctx
, payload_buf
, payload_len
, NULL
, 0);
707 * Check if the current kernel tracer supports the session rotation feature.
708 * Return 1 if it does, 0 otherwise.
710 static int check_rotate_compatible(void)
714 if (kernel_tracer_version
.major
!= 2 || kernel_tracer_version
.minor
< 11) {
715 DBG("Kernel tracer version is not compatible with the rotation feature");
723 * Send data on a unix socket using the liblttsessiondcomm API.
725 * Return lttcomm error code.
727 static int send_unix_sock(int sock
, struct lttng_payload_view
*view
)
730 const int fd_count
= lttng_payload_view_get_fd_handle_count(view
);
732 /* Check valid length */
733 if (view
->buffer
.size
== 0) {
738 ret
= lttcomm_send_unix_sock(
739 sock
, view
->buffer
.data
, view
->buffer
.size
);
745 ret
= lttcomm_send_payload_view_fds_unix_sock(sock
, view
);
756 * Process the command requested by the lttng client within the command
757 * context structure. This function make sure that the return structure (llm)
758 * is set and ready for transmission before returning.
760 * Return any error encountered or 0 for success.
762 * "sock" is only used for special-case var. len data.
763 * A command may assume the ownership of the socket, in which case its value
764 * should be set to -1.
766 * Should *NOT* be called with RCU read-side lock held.
768 static int process_client_msg(struct command_ctx
*cmd_ctx
, int *sock
,
772 int need_tracing_session
= 1;
775 DBG("Processing client command %d", cmd_ctx
->lsm
.cmd_type
);
777 assert(!rcu_read_ongoing());
781 switch (cmd_ctx
->lsm
.cmd_type
) {
782 case LTTNG_CREATE_SESSION_EXT
:
783 case LTTNG_DESTROY_SESSION
:
784 case LTTNG_LIST_SESSIONS
:
785 case LTTNG_LIST_DOMAINS
:
786 case LTTNG_START_TRACE
:
787 case LTTNG_STOP_TRACE
:
788 case LTTNG_DATA_PENDING
:
789 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
790 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
791 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
792 case LTTNG_SNAPSHOT_RECORD
:
793 case LTTNG_SAVE_SESSION
:
794 case LTTNG_SET_SESSION_SHM_PATH
:
795 case LTTNG_REGENERATE_METADATA
:
796 case LTTNG_REGENERATE_STATEDUMP
:
797 case LTTNG_REGISTER_TRIGGER
:
798 case LTTNG_UNREGISTER_TRIGGER
:
799 case LTTNG_ROTATE_SESSION
:
800 case LTTNG_ROTATION_GET_INFO
:
801 case LTTNG_ROTATION_SET_SCHEDULE
:
802 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES
:
803 case LTTNG_CLEAR_SESSION
:
804 case LTTNG_LIST_TRIGGERS
:
811 if (config
.no_kernel
&& need_domain
812 && cmd_ctx
->lsm
.domain
.type
== LTTNG_DOMAIN_KERNEL
) {
814 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
816 ret
= LTTNG_ERR_KERN_NA
;
821 /* Deny register consumer if we already have a spawned consumer. */
822 if (cmd_ctx
->lsm
.cmd_type
== LTTNG_REGISTER_CONSUMER
) {
823 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
824 if (kconsumer_data
.pid
> 0) {
825 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
826 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
829 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
833 * Check for command that don't needs to allocate a returned payload. We do
834 * this here so we don't have to make the call for no payload at each
837 switch(cmd_ctx
->lsm
.cmd_type
) {
838 case LTTNG_LIST_SESSIONS
:
839 case LTTNG_LIST_TRACEPOINTS
:
840 case LTTNG_LIST_TRACEPOINT_FIELDS
:
841 case LTTNG_LIST_DOMAINS
:
842 case LTTNG_LIST_CHANNELS
:
843 case LTTNG_LIST_EVENTS
:
844 case LTTNG_LIST_SYSCALLS
:
845 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES
:
846 case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY
:
847 case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET
:
848 case LTTNG_DATA_PENDING
:
849 case LTTNG_ROTATE_SESSION
:
850 case LTTNG_ROTATION_GET_INFO
:
851 case LTTNG_LIST_TRIGGERS
:
854 /* Setup lttng message with no payload */
855 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, NULL
, 0);
857 /* This label does not try to unlock the session */
858 goto init_setup_error
;
862 /* Commands that DO NOT need a session. */
863 switch (cmd_ctx
->lsm
.cmd_type
) {
864 case LTTNG_CREATE_SESSION_EXT
:
865 case LTTNG_LIST_SESSIONS
:
866 case LTTNG_LIST_TRACEPOINTS
:
867 case LTTNG_LIST_SYSCALLS
:
868 case LTTNG_LIST_TRACEPOINT_FIELDS
:
869 case LTTNG_SAVE_SESSION
:
870 case LTTNG_REGISTER_TRIGGER
:
871 case LTTNG_UNREGISTER_TRIGGER
:
872 case LTTNG_LIST_TRIGGERS
:
873 need_tracing_session
= 0;
876 DBG("Getting session %s by name", cmd_ctx
->lsm
.session
.name
);
878 * We keep the session list lock across _all_ commands
879 * for now, because the per-session lock does not
880 * handle teardown properly.
883 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
.session
.name
);
884 if (cmd_ctx
->session
== NULL
) {
885 ret
= LTTNG_ERR_SESS_NOT_FOUND
;
888 /* Acquire lock for the session */
889 session_lock(cmd_ctx
->session
);
895 * Commands that need a valid session but should NOT create one if none
896 * exists. Instead of creating one and destroying it when the command is
897 * handled, process that right before so we save some round trip in useless
900 switch (cmd_ctx
->lsm
.cmd_type
) {
901 case LTTNG_DISABLE_CHANNEL
:
902 case LTTNG_DISABLE_EVENT
:
903 switch (cmd_ctx
->lsm
.domain
.type
) {
904 case LTTNG_DOMAIN_KERNEL
:
905 if (!cmd_ctx
->session
->kernel_session
) {
906 ret
= LTTNG_ERR_NO_CHANNEL
;
910 case LTTNG_DOMAIN_JUL
:
911 case LTTNG_DOMAIN_LOG4J
:
912 case LTTNG_DOMAIN_PYTHON
:
913 case LTTNG_DOMAIN_UST
:
914 if (!cmd_ctx
->session
->ust_session
) {
915 ret
= LTTNG_ERR_NO_CHANNEL
;
920 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
932 * Check domain type for specific "pre-action".
934 switch (cmd_ctx
->lsm
.domain
.type
) {
935 case LTTNG_DOMAIN_KERNEL
:
937 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
941 /* Kernel tracer check */
942 if (!kernel_tracer_is_initialized()) {
943 /* Basically, load kernel tracer modules */
944 ret
= init_kernel_tracer();
950 /* Consumer is in an ERROR state. Report back to client */
951 if (uatomic_read(&kernel_consumerd_state
) == CONSUMER_ERROR
) {
952 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
956 /* Need a session for kernel command */
957 if (need_tracing_session
) {
958 if (cmd_ctx
->session
->kernel_session
== NULL
) {
959 ret
= create_kernel_session(cmd_ctx
->session
);
960 if (ret
!= LTTNG_OK
) {
961 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
966 /* Start the kernel consumer daemon */
967 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
968 if (kconsumer_data
.pid
== 0 &&
969 cmd_ctx
->lsm
.cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
970 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
971 ret
= start_consumerd(&kconsumer_data
);
973 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
976 uatomic_set(&kernel_consumerd_state
, CONSUMER_STARTED
);
978 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
982 * The consumer was just spawned so we need to add the socket to
983 * the consumer output of the session if exist.
985 ret
= consumer_create_socket(&kconsumer_data
,
986 cmd_ctx
->session
->kernel_session
->consumer
);
993 case LTTNG_DOMAIN_JUL
:
994 case LTTNG_DOMAIN_LOG4J
:
995 case LTTNG_DOMAIN_PYTHON
:
996 case LTTNG_DOMAIN_UST
:
998 if (!ust_app_supported()) {
999 ret
= LTTNG_ERR_NO_UST
;
1002 /* Consumer is in an ERROR state. Report back to client */
1003 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
1004 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
1008 if (need_tracing_session
) {
1009 /* Create UST session if none exist. */
1010 if (cmd_ctx
->session
->ust_session
== NULL
) {
1011 ret
= create_ust_session(cmd_ctx
->session
,
1012 ALIGNED_CONST_PTR(cmd_ctx
->lsm
.domain
));
1013 if (ret
!= LTTNG_OK
) {
1018 /* Start the UST consumer daemons */
1020 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
1021 if (config
.consumerd64_bin_path
.value
&&
1022 ustconsumer64_data
.pid
== 0 &&
1023 cmd_ctx
->lsm
.cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
1024 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
1025 ret
= start_consumerd(&ustconsumer64_data
);
1027 ret
= LTTNG_ERR_UST_CONSUMER64_FAIL
;
1028 uatomic_set(&ust_consumerd64_fd
, -EINVAL
);
1032 uatomic_set(&ust_consumerd64_fd
, ustconsumer64_data
.cmd_sock
);
1033 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
1035 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
1039 * Setup socket for consumer 64 bit. No need for atomic access
1040 * since it was set above and can ONLY be set in this thread.
1042 ret
= consumer_create_socket(&ustconsumer64_data
,
1043 cmd_ctx
->session
->ust_session
->consumer
);
1049 pthread_mutex_lock(&ustconsumer32_data
.pid_mutex
);
1050 if (config
.consumerd32_bin_path
.value
&&
1051 ustconsumer32_data
.pid
== 0 &&
1052 cmd_ctx
->lsm
.cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
1053 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
1054 ret
= start_consumerd(&ustconsumer32_data
);
1056 ret
= LTTNG_ERR_UST_CONSUMER32_FAIL
;
1057 uatomic_set(&ust_consumerd32_fd
, -EINVAL
);
1061 uatomic_set(&ust_consumerd32_fd
, ustconsumer32_data
.cmd_sock
);
1062 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
1064 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
1068 * Setup socket for consumer 32 bit. No need for atomic access
1069 * since it was set above and can ONLY be set in this thread.
1071 ret
= consumer_create_socket(&ustconsumer32_data
,
1072 cmd_ctx
->session
->ust_session
->consumer
);
1084 /* Validate consumer daemon state when start/stop trace command */
1085 if (cmd_ctx
->lsm
.cmd_type
== LTTNG_START_TRACE
||
1086 cmd_ctx
->lsm
.cmd_type
== LTTNG_STOP_TRACE
) {
1087 switch (cmd_ctx
->lsm
.domain
.type
) {
1088 case LTTNG_DOMAIN_NONE
:
1090 case LTTNG_DOMAIN_JUL
:
1091 case LTTNG_DOMAIN_LOG4J
:
1092 case LTTNG_DOMAIN_PYTHON
:
1093 case LTTNG_DOMAIN_UST
:
1094 if (uatomic_read(&ust_consumerd_state
) != CONSUMER_STARTED
) {
1095 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
1099 case LTTNG_DOMAIN_KERNEL
:
1100 if (uatomic_read(&kernel_consumerd_state
) != CONSUMER_STARTED
) {
1101 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
1106 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1112 * Check that the UID matches that of the tracing session.
1113 * The root user can interact with all sessions.
1115 if (need_tracing_session
) {
1116 if (!session_access_ok(cmd_ctx
->session
,
1117 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
)) ||
1118 cmd_ctx
->session
->destroyed
) {
1119 ret
= LTTNG_ERR_EPERM
;
1125 * Send relayd information to consumer as soon as we have a domain and a
1128 if (cmd_ctx
->session
&& need_domain
) {
1130 * Setup relayd if not done yet. If the relayd information was already
1131 * sent to the consumer, this call will gracefully return.
1133 ret
= cmd_setup_relayd(cmd_ctx
->session
);
1134 if (ret
!= LTTNG_OK
) {
1139 /* Process by command type */
1140 switch (cmd_ctx
->lsm
.cmd_type
) {
1141 case LTTNG_ADD_CONTEXT
:
1144 * An LTTNG_ADD_CONTEXT command might have a supplementary
1145 * payload if the context being added is an application context.
1147 if (cmd_ctx
->lsm
.u
.context
.ctx
.ctx
==
1148 LTTNG_EVENT_CONTEXT_APP_CONTEXT
) {
1149 char *provider_name
= NULL
, *context_name
= NULL
;
1150 size_t provider_name_len
=
1151 cmd_ctx
->lsm
.u
.context
.provider_name_len
;
1152 size_t context_name_len
=
1153 cmd_ctx
->lsm
.u
.context
.context_name_len
;
1155 if (provider_name_len
== 0 || context_name_len
== 0) {
1157 * Application provider and context names MUST
1160 ret
= -LTTNG_ERR_INVALID
;
1164 provider_name
= zmalloc(provider_name_len
+ 1);
1165 if (!provider_name
) {
1166 ret
= -LTTNG_ERR_NOMEM
;
1169 cmd_ctx
->lsm
.u
.context
.ctx
.u
.app_ctx
.provider_name
=
1172 context_name
= zmalloc(context_name_len
+ 1);
1173 if (!context_name
) {
1174 ret
= -LTTNG_ERR_NOMEM
;
1175 goto error_add_context
;
1177 cmd_ctx
->lsm
.u
.context
.ctx
.u
.app_ctx
.ctx_name
=
1180 ret
= lttcomm_recv_unix_sock(*sock
, provider_name
,
1183 goto error_add_context
;
1186 ret
= lttcomm_recv_unix_sock(*sock
, context_name
,
1189 goto error_add_context
;
1194 * cmd_add_context assumes ownership of the provider and context
1197 ret
= cmd_add_context(cmd_ctx
->session
,
1198 cmd_ctx
->lsm
.domain
.type
,
1199 cmd_ctx
->lsm
.u
.context
.channel_name
,
1200 ALIGNED_CONST_PTR(cmd_ctx
->lsm
.u
.context
.ctx
),
1201 kernel_poll_pipe
[1]);
1203 cmd_ctx
->lsm
.u
.context
.ctx
.u
.app_ctx
.provider_name
= NULL
;
1204 cmd_ctx
->lsm
.u
.context
.ctx
.u
.app_ctx
.ctx_name
= NULL
;
1206 free(cmd_ctx
->lsm
.u
.context
.ctx
.u
.app_ctx
.provider_name
);
1207 free(cmd_ctx
->lsm
.u
.context
.ctx
.u
.app_ctx
.ctx_name
);
1213 case LTTNG_DISABLE_CHANNEL
:
1215 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
.domain
.type
,
1216 cmd_ctx
->lsm
.u
.disable
.channel_name
);
1219 case LTTNG_DISABLE_EVENT
:
1223 * FIXME: handle filter; for now we just receive the filter's
1224 * bytecode along with the filter expression which are sent by
1225 * liblttng-ctl and discard them.
1227 * This fixes an issue where the client may block while sending
1228 * the filter payload and encounter an error because the session
1229 * daemon closes the socket without ever handling this data.
1231 size_t count
= cmd_ctx
->lsm
.u
.disable
.expression_len
+
1232 cmd_ctx
->lsm
.u
.disable
.bytecode_len
;
1235 char data
[LTTNG_FILTER_MAX_LEN
];
1237 DBG("Discarding disable event command payload of size %zu", count
);
1239 ret
= lttcomm_recv_unix_sock(*sock
, data
,
1240 count
> sizeof(data
) ? sizeof(data
) : count
);
1245 count
-= (size_t) ret
;
1248 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
.domain
.type
,
1249 cmd_ctx
->lsm
.u
.disable
.channel_name
,
1250 ALIGNED_CONST_PTR(cmd_ctx
->lsm
.u
.disable
.event
));
1253 case LTTNG_ENABLE_CHANNEL
:
1255 cmd_ctx
->lsm
.u
.channel
.chan
.attr
.extended
.ptr
=
1256 (struct lttng_channel_extended
*) &cmd_ctx
->lsm
.u
.channel
.extended
;
1257 ret
= cmd_enable_channel(cmd_ctx
->session
,
1258 ALIGNED_CONST_PTR(cmd_ctx
->lsm
.domain
),
1259 ALIGNED_CONST_PTR(cmd_ctx
->lsm
.u
.channel
.chan
),
1260 kernel_poll_pipe
[1]);
1263 case LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE
:
1264 case LTTNG_PROCESS_ATTR_TRACKER_REMOVE_INCLUDE_VALUE
:
1266 struct lttng_dynamic_buffer payload
;
1267 struct lttng_buffer_view payload_view
;
1268 const bool add_value
=
1269 cmd_ctx
->lsm
.cmd_type
==
1270 LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE
;
1271 const size_t name_len
=
1272 cmd_ctx
->lsm
.u
.process_attr_tracker_add_remove_include_value
1274 const enum lttng_domain_type domain_type
=
1275 (enum lttng_domain_type
)
1276 cmd_ctx
->lsm
.domain
.type
;
1277 const enum lttng_process_attr process_attr
=
1278 (enum lttng_process_attr
) cmd_ctx
->lsm
.u
1279 .process_attr_tracker_add_remove_include_value
1281 const enum lttng_process_attr_value_type value_type
=
1282 (enum lttng_process_attr_value_type
) cmd_ctx
1284 .process_attr_tracker_add_remove_include_value
1286 struct process_attr_value
*value
;
1287 enum lttng_error_code ret_code
;
1288 long login_name_max
;
1290 login_name_max
= sysconf(_SC_LOGIN_NAME_MAX
);
1291 if (login_name_max
< 0) {
1292 PERROR("Failed to get _SC_LOGIN_NAME_MAX system configuration");
1293 ret
= LTTNG_ERR_INVALID
;
1297 /* Receive remaining variable length payload if applicable. */
1298 if (name_len
> login_name_max
) {
1300 * POSIX mandates user and group names that are at least
1301 * 8 characters long. Note that although shadow-utils
1302 * (useradd, groupaadd, etc.) use 32 chars as their
1303 * limit (from bits/utmp.h, UT_NAMESIZE),
1304 * LOGIN_NAME_MAX is defined to 256.
1306 ERR("Rejecting process attribute tracker value %s as the provided exceeds the maximal allowed length: argument length = %zu, maximal length = %ld",
1307 add_value
? "addition" : "removal",
1308 name_len
, login_name_max
);
1309 ret
= LTTNG_ERR_INVALID
;
1313 lttng_dynamic_buffer_init(&payload
);
1314 if (name_len
!= 0) {
1316 * Receive variable payload for user/group name
1319 ret
= lttng_dynamic_buffer_set_size(&payload
, name_len
);
1321 ERR("Failed to allocate buffer to receive payload of %s process attribute tracker value argument",
1322 add_value
? "add" : "remove");
1323 ret
= LTTNG_ERR_NOMEM
;
1324 goto error_add_remove_tracker_value
;
1327 ret
= lttcomm_recv_unix_sock(
1328 *sock
, payload
.data
, name_len
);
1330 ERR("Failed to receive payload of %s process attribute tracker value argument",
1331 add_value
? "add" : "remove");
1333 ret
= LTTNG_ERR_INVALID_PROTOCOL
;
1334 goto error_add_remove_tracker_value
;
1338 payload_view
= lttng_buffer_view_from_dynamic_buffer(
1339 &payload
, 0, name_len
);
1340 if (name_len
> 0 && !lttng_buffer_view_is_valid(&payload_view
)) {
1341 ret
= LTTNG_ERR_INVALID_PROTOCOL
;
1342 goto error_add_remove_tracker_value
;
1346 * Validate the value type and domains are legal for the process
1347 * attribute tracker that is specified and convert the value to
1348 * add/remove to the internal sessiond representation.
1350 ret_code
= process_attr_value_from_comm(domain_type
,
1351 process_attr
, value_type
,
1352 &cmd_ctx
->lsm
.u
.process_attr_tracker_add_remove_include_value
1354 &payload_view
, &value
);
1355 if (ret_code
!= LTTNG_OK
) {
1357 goto error_add_remove_tracker_value
;
1361 ret
= cmd_process_attr_tracker_inclusion_set_add_value(
1362 cmd_ctx
->session
, domain_type
,
1363 process_attr
, value
);
1365 ret
= cmd_process_attr_tracker_inclusion_set_remove_value(
1366 cmd_ctx
->session
, domain_type
,
1367 process_attr
, value
);
1369 process_attr_value_destroy(value
);
1370 error_add_remove_tracker_value
:
1371 lttng_dynamic_buffer_reset(&payload
);
1374 case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY
:
1376 enum lttng_tracking_policy tracking_policy
;
1377 const enum lttng_domain_type domain_type
=
1378 (enum lttng_domain_type
)
1379 cmd_ctx
->lsm
.domain
.type
;
1380 const enum lttng_process_attr process_attr
=
1381 (enum lttng_process_attr
) cmd_ctx
->lsm
.u
1382 .process_attr_tracker_get_tracking_policy
1385 ret
= cmd_process_attr_tracker_get_tracking_policy(
1386 cmd_ctx
->session
, domain_type
, process_attr
,
1388 if (ret
!= LTTNG_OK
) {
1392 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
,
1393 &(uint32_t){tracking_policy
}, sizeof(uint32_t));
1395 ret
= LTTNG_ERR_NOMEM
;
1401 case LTTNG_PROCESS_ATTR_TRACKER_SET_POLICY
:
1403 const enum lttng_tracking_policy tracking_policy
=
1404 (enum lttng_tracking_policy
) cmd_ctx
->lsm
.u
1405 .process_attr_tracker_set_tracking_policy
1407 const enum lttng_domain_type domain_type
=
1408 (enum lttng_domain_type
)
1409 cmd_ctx
->lsm
.domain
.type
;
1410 const enum lttng_process_attr process_attr
=
1411 (enum lttng_process_attr
) cmd_ctx
->lsm
.u
1412 .process_attr_tracker_set_tracking_policy
1415 ret
= cmd_process_attr_tracker_set_tracking_policy(
1416 cmd_ctx
->session
, domain_type
, process_attr
,
1418 if (ret
!= LTTNG_OK
) {
1423 case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET
:
1425 struct lttng_process_attr_values
*values
;
1426 struct lttng_dynamic_buffer reply
;
1427 const enum lttng_domain_type domain_type
=
1428 (enum lttng_domain_type
)
1429 cmd_ctx
->lsm
.domain
.type
;
1430 const enum lttng_process_attr process_attr
=
1431 (enum lttng_process_attr
) cmd_ctx
->lsm
.u
1432 .process_attr_tracker_get_inclusion_set
1435 ret
= cmd_process_attr_tracker_get_inclusion_set(
1436 cmd_ctx
->session
, domain_type
, process_attr
,
1438 if (ret
!= LTTNG_OK
) {
1442 lttng_dynamic_buffer_init(&reply
);
1443 ret
= lttng_process_attr_values_serialize(values
, &reply
);
1445 goto error_tracker_get_inclusion_set
;
1448 ret
= setup_lttng_msg_no_cmd_header(
1449 cmd_ctx
, reply
.data
, reply
.size
);
1451 ret
= LTTNG_ERR_NOMEM
;
1452 goto error_tracker_get_inclusion_set
;
1456 error_tracker_get_inclusion_set
:
1457 lttng_process_attr_values_destroy(values
);
1458 lttng_dynamic_buffer_reset(&reply
);
1461 case LTTNG_ENABLE_EVENT
:
1463 struct lttng_event
*ev
= NULL
;
1464 struct lttng_event_exclusion
*exclusion
= NULL
;
1465 struct lttng_filter_bytecode
*bytecode
= NULL
;
1466 char *filter_expression
= NULL
;
1468 /* Handle exclusion events and receive it from the client. */
1469 if (cmd_ctx
->lsm
.u
.enable
.exclusion_count
> 0) {
1470 size_t count
= cmd_ctx
->lsm
.u
.enable
.exclusion_count
;
1472 exclusion
= zmalloc(sizeof(struct lttng_event_exclusion
) +
1473 (count
* LTTNG_SYMBOL_NAME_LEN
));
1475 ret
= LTTNG_ERR_EXCLUSION_NOMEM
;
1479 DBG("Receiving var len exclusion event list from client ...");
1480 exclusion
->count
= count
;
1481 ret
= lttcomm_recv_unix_sock(*sock
, exclusion
->names
,
1482 count
* LTTNG_SYMBOL_NAME_LEN
);
1484 DBG("Nothing recv() from client var len data... continuing");
1487 ret
= LTTNG_ERR_EXCLUSION_INVAL
;
1492 /* Get filter expression from client. */
1493 if (cmd_ctx
->lsm
.u
.enable
.expression_len
> 0) {
1494 size_t expression_len
=
1495 cmd_ctx
->lsm
.u
.enable
.expression_len
;
1497 if (expression_len
> LTTNG_FILTER_MAX_LEN
) {
1498 ret
= LTTNG_ERR_FILTER_INVAL
;
1503 filter_expression
= zmalloc(expression_len
);
1504 if (!filter_expression
) {
1506 ret
= LTTNG_ERR_FILTER_NOMEM
;
1510 /* Receive var. len. data */
1511 DBG("Receiving var len filter's expression from client ...");
1512 ret
= lttcomm_recv_unix_sock(*sock
, filter_expression
,
1515 DBG("Nothing recv() from client var len data... continuing");
1517 free(filter_expression
);
1519 ret
= LTTNG_ERR_FILTER_INVAL
;
1524 /* Handle filter and get bytecode from client. */
1525 if (cmd_ctx
->lsm
.u
.enable
.bytecode_len
> 0) {
1526 size_t bytecode_len
= cmd_ctx
->lsm
.u
.enable
.bytecode_len
;
1528 if (bytecode_len
> LTTNG_FILTER_MAX_LEN
) {
1529 ret
= LTTNG_ERR_FILTER_INVAL
;
1530 free(filter_expression
);
1535 bytecode
= zmalloc(bytecode_len
);
1537 free(filter_expression
);
1539 ret
= LTTNG_ERR_FILTER_NOMEM
;
1543 /* Receive var. len. data */
1544 DBG("Receiving var len filter's bytecode from client ...");
1545 ret
= lttcomm_recv_unix_sock(*sock
, bytecode
, bytecode_len
);
1547 DBG("Nothing recv() from client var len data... continuing");
1549 free(filter_expression
);
1552 ret
= LTTNG_ERR_FILTER_INVAL
;
1556 if ((bytecode
->len
+ sizeof(*bytecode
)) != bytecode_len
) {
1557 free(filter_expression
);
1560 ret
= LTTNG_ERR_FILTER_INVAL
;
1565 ev
= lttng_event_copy(ALIGNED_CONST_PTR(cmd_ctx
->lsm
.u
.enable
.event
));
1567 DBG("Failed to copy event: %s",
1568 cmd_ctx
->lsm
.u
.enable
.event
.name
);
1569 free(filter_expression
);
1572 ret
= LTTNG_ERR_NOMEM
;
1577 if (cmd_ctx
->lsm
.u
.enable
.userspace_probe_location_len
> 0) {
1578 /* Expect a userspace probe description. */
1579 ret
= receive_userspace_probe(cmd_ctx
, *sock
, sock_error
, ev
);
1581 free(filter_expression
);
1584 lttng_event_destroy(ev
);
1589 ret
= cmd_enable_event(cmd_ctx
->session
,
1590 ALIGNED_CONST_PTR(cmd_ctx
->lsm
.domain
),
1591 cmd_ctx
->lsm
.u
.enable
.channel_name
,
1593 filter_expression
, bytecode
, exclusion
,
1594 kernel_poll_pipe
[1]);
1595 lttng_event_destroy(ev
);
1598 case LTTNG_LIST_TRACEPOINTS
:
1600 struct lttng_event
*events
;
1603 session_lock_list();
1604 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
.domain
.type
, &events
);
1605 session_unlock_list();
1606 if (nb_events
< 0) {
1607 /* Return value is a negative lttng_error_code. */
1613 * Setup lttng message with payload size set to the event list size in
1614 * bytes and then copy list into the llm payload.
1616 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, events
,
1617 sizeof(struct lttng_event
) * nb_events
);
1627 case LTTNG_LIST_TRACEPOINT_FIELDS
:
1629 struct lttng_event_field
*fields
;
1632 session_lock_list();
1633 nb_fields
= cmd_list_tracepoint_fields(cmd_ctx
->lsm
.domain
.type
,
1635 session_unlock_list();
1636 if (nb_fields
< 0) {
1637 /* Return value is a negative lttng_error_code. */
1643 * Setup lttng message with payload size set to the event list size in
1644 * bytes and then copy list into the llm payload.
1646 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, fields
,
1647 sizeof(struct lttng_event_field
) * nb_fields
);
1657 case LTTNG_LIST_SYSCALLS
:
1659 struct lttng_event
*events
;
1662 nb_events
= cmd_list_syscalls(&events
);
1663 if (nb_events
< 0) {
1664 /* Return value is a negative lttng_error_code. */
1670 * Setup lttng message with payload size set to the event list size in
1671 * bytes and then copy list into the llm payload.
1673 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, events
,
1674 sizeof(struct lttng_event
) * nb_events
);
1684 case LTTNG_SET_CONSUMER_URI
:
1687 struct lttng_uri
*uris
;
1689 nb_uri
= cmd_ctx
->lsm
.u
.uri
.size
;
1690 len
= nb_uri
* sizeof(struct lttng_uri
);
1693 ret
= LTTNG_ERR_INVALID
;
1697 uris
= zmalloc(len
);
1699 ret
= LTTNG_ERR_FATAL
;
1703 /* Receive variable len data */
1704 DBG("Receiving %zu URI(s) from client ...", nb_uri
);
1705 ret
= lttcomm_recv_unix_sock(*sock
, uris
, len
);
1707 DBG("No URIs received from client... continuing");
1709 ret
= LTTNG_ERR_SESSION_FAIL
;
1714 ret
= cmd_set_consumer_uri(cmd_ctx
->session
, nb_uri
, uris
);
1716 if (ret
!= LTTNG_OK
) {
1723 case LTTNG_START_TRACE
:
1726 * On the first start, if we have a kernel session and we have
1727 * enabled time or size-based rotations, we have to make sure
1728 * the kernel tracer supports it.
1730 if (!cmd_ctx
->session
->has_been_started
&& \
1731 cmd_ctx
->session
->kernel_session
&& \
1732 (cmd_ctx
->session
->rotate_timer_period
|| \
1733 cmd_ctx
->session
->rotate_size
) && \
1734 !check_rotate_compatible()) {
1735 DBG("Kernel tracer version is not compatible with the rotation feature");
1736 ret
= LTTNG_ERR_ROTATION_WRONG_VERSION
;
1739 ret
= cmd_start_trace(cmd_ctx
->session
);
1742 case LTTNG_STOP_TRACE
:
1744 ret
= cmd_stop_trace(cmd_ctx
->session
);
1747 case LTTNG_DESTROY_SESSION
:
1749 ret
= cmd_destroy_session(cmd_ctx
->session
,
1750 notification_thread_handle
,
1754 case LTTNG_LIST_DOMAINS
:
1757 struct lttng_domain
*domains
= NULL
;
1759 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
1761 /* Return value is a negative lttng_error_code. */
1766 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, domains
,
1767 nb_dom
* sizeof(struct lttng_domain
));
1777 case LTTNG_LIST_CHANNELS
:
1779 ssize_t payload_size
;
1780 struct lttng_channel
*channels
= NULL
;
1782 payload_size
= cmd_list_channels(cmd_ctx
->lsm
.domain
.type
,
1783 cmd_ctx
->session
, &channels
);
1784 if (payload_size
< 0) {
1785 /* Return value is a negative lttng_error_code. */
1786 ret
= -payload_size
;
1790 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, channels
,
1801 case LTTNG_LIST_EVENTS
:
1804 struct lttcomm_event_command_header cmd_header
= {};
1805 size_t original_payload_size
;
1806 size_t payload_size
;
1808 ret
= setup_empty_lttng_msg(cmd_ctx
);
1810 ret
= LTTNG_ERR_NOMEM
;
1814 original_payload_size
= cmd_ctx
->reply_payload
.buffer
.size
;
1816 /* Extended infos are included at the end of the payload. */
1817 list_ret
= cmd_list_events(cmd_ctx
->lsm
.domain
.type
,
1819 cmd_ctx
->lsm
.u
.list
.channel_name
,
1820 &cmd_ctx
->reply_payload
);
1822 /* Return value is a negative lttng_error_code. */
1827 payload_size
= cmd_ctx
->reply_payload
.buffer
.size
-
1828 sizeof(cmd_header
) - original_payload_size
;
1829 update_lttng_msg(cmd_ctx
, sizeof(cmd_header
), payload_size
);
1834 case LTTNG_LIST_SESSIONS
:
1836 unsigned int nr_sessions
;
1837 void *sessions_payload
;
1840 session_lock_list();
1841 nr_sessions
= lttng_sessions_count(
1842 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
1843 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
1845 payload_len
= (sizeof(struct lttng_session
) * nr_sessions
) +
1846 (sizeof(struct lttng_session_extended
) * nr_sessions
);
1847 sessions_payload
= zmalloc(payload_len
);
1849 if (!sessions_payload
) {
1850 session_unlock_list();
1855 cmd_list_lttng_sessions(sessions_payload
, nr_sessions
,
1856 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
1857 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
1858 session_unlock_list();
1860 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, sessions_payload
,
1862 free(sessions_payload
);
1871 case LTTNG_REGISTER_CONSUMER
:
1873 struct consumer_data
*cdata
;
1875 switch (cmd_ctx
->lsm
.domain
.type
) {
1876 case LTTNG_DOMAIN_KERNEL
:
1877 cdata
= &kconsumer_data
;
1880 ret
= LTTNG_ERR_UND
;
1884 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
.domain
.type
,
1885 cmd_ctx
->lsm
.u
.reg
.path
, cdata
);
1888 case LTTNG_DATA_PENDING
:
1891 uint8_t pending_ret_byte
;
1893 pending_ret
= cmd_data_pending(cmd_ctx
->session
);
1898 * This function may returns 0 or 1 to indicate whether or not
1899 * there is data pending. In case of error, it should return an
1900 * LTTNG_ERR code. However, some code paths may still return
1901 * a nondescript error code, which we handle by returning an
1904 if (pending_ret
== 0 || pending_ret
== 1) {
1906 * ret will be set to LTTNG_OK at the end of
1909 } else if (pending_ret
< 0) {
1910 ret
= LTTNG_ERR_UNK
;
1917 pending_ret_byte
= (uint8_t) pending_ret
;
1919 /* 1 byte to return whether or not data is pending */
1920 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
,
1921 &pending_ret_byte
, 1);
1930 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
1932 uint32_t snapshot_id
;
1933 struct lttcomm_lttng_output_id reply
;
1935 ret
= cmd_snapshot_add_output(cmd_ctx
->session
,
1936 ALIGNED_CONST_PTR(cmd_ctx
->lsm
.u
.snapshot_output
.output
),
1938 if (ret
!= LTTNG_OK
) {
1941 reply
.id
= snapshot_id
;
1943 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &reply
,
1949 /* Copy output list into message payload */
1953 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
1955 ret
= cmd_snapshot_del_output(cmd_ctx
->session
,
1956 ALIGNED_CONST_PTR(cmd_ctx
->lsm
.u
.snapshot_output
.output
));
1959 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
1962 struct lttng_snapshot_output
*outputs
= NULL
;
1964 nb_output
= cmd_snapshot_list_outputs(cmd_ctx
->session
, &outputs
);
1965 if (nb_output
< 0) {
1970 assert((nb_output
> 0 && outputs
) || nb_output
== 0);
1971 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, outputs
,
1972 nb_output
* sizeof(struct lttng_snapshot_output
));
1982 case LTTNG_SNAPSHOT_RECORD
:
1984 ret
= cmd_snapshot_record(cmd_ctx
->session
,
1985 ALIGNED_CONST_PTR(cmd_ctx
->lsm
.u
.snapshot_record
.output
),
1986 cmd_ctx
->lsm
.u
.snapshot_record
.wait
);
1989 case LTTNG_CREATE_SESSION_EXT
:
1991 struct lttng_dynamic_buffer payload
;
1992 struct lttng_session_descriptor
*return_descriptor
= NULL
;
1994 lttng_dynamic_buffer_init(&payload
);
1995 ret
= cmd_create_session(cmd_ctx
, *sock
, &return_descriptor
);
1996 if (ret
!= LTTNG_OK
) {
2000 ret
= lttng_session_descriptor_serialize(return_descriptor
,
2003 ERR("Failed to serialize session descriptor in reply to \"create session\" command");
2004 lttng_session_descriptor_destroy(return_descriptor
);
2005 ret
= LTTNG_ERR_NOMEM
;
2008 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, payload
.data
,
2011 lttng_session_descriptor_destroy(return_descriptor
);
2012 ret
= LTTNG_ERR_NOMEM
;
2015 lttng_dynamic_buffer_reset(&payload
);
2016 lttng_session_descriptor_destroy(return_descriptor
);
2020 case LTTNG_SAVE_SESSION
:
2022 ret
= cmd_save_sessions(&cmd_ctx
->lsm
.u
.save_session
.attr
,
2026 case LTTNG_SET_SESSION_SHM_PATH
:
2028 ret
= cmd_set_session_shm_path(cmd_ctx
->session
,
2029 cmd_ctx
->lsm
.u
.set_shm_path
.shm_path
);
2032 case LTTNG_REGENERATE_METADATA
:
2034 ret
= cmd_regenerate_metadata(cmd_ctx
->session
);
2037 case LTTNG_REGENERATE_STATEDUMP
:
2039 ret
= cmd_regenerate_statedump(cmd_ctx
->session
);
2042 case LTTNG_REGISTER_TRIGGER
:
2044 struct lttng_trigger
*return_trigger
;
2045 size_t original_payload_size
;
2046 size_t payload_size
;
2048 ret
= setup_empty_lttng_msg(cmd_ctx
);
2050 ret
= LTTNG_ERR_NOMEM
;
2054 original_payload_size
= cmd_ctx
->reply_payload
.buffer
.size
;
2056 ret
= cmd_register_trigger(cmd_ctx
, *sock
,
2057 notification_thread_handle
, &return_trigger
);
2058 if (ret
!= LTTNG_OK
) {
2062 ret
= lttng_trigger_serialize(return_trigger
, &cmd_ctx
->reply_payload
);
2064 ERR("Failed to serialize trigger in reply to \"register trigger\" command");
2065 ret
= LTTNG_ERR_NOMEM
;
2066 lttng_trigger_destroy(return_trigger
);
2070 lttng_trigger_destroy(return_trigger
);
2071 return_trigger
= NULL
;
2073 payload_size
= cmd_ctx
->reply_payload
.buffer
.size
-
2074 original_payload_size
;
2076 update_lttng_msg(cmd_ctx
, 0, payload_size
);
2081 case LTTNG_UNREGISTER_TRIGGER
:
2083 ret
= cmd_unregister_trigger(cmd_ctx
, *sock
,
2084 notification_thread_handle
);
2087 case LTTNG_ROTATE_SESSION
:
2089 struct lttng_rotate_session_return rotate_return
;
2091 DBG("Client rotate session \"%s\"", cmd_ctx
->session
->name
);
2093 memset(&rotate_return
, 0, sizeof(rotate_return
));
2094 if (cmd_ctx
->session
->kernel_session
&& !check_rotate_compatible()) {
2095 DBG("Kernel tracer version is not compatible with the rotation feature");
2096 ret
= LTTNG_ERR_ROTATION_WRONG_VERSION
;
2100 ret
= cmd_rotate_session(cmd_ctx
->session
, &rotate_return
,
2102 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED
);
2108 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &rotate_return
,
2109 sizeof(rotate_return
));
2118 case LTTNG_ROTATION_GET_INFO
:
2120 struct lttng_rotation_get_info_return get_info_return
;
2122 memset(&get_info_return
, 0, sizeof(get_info_return
));
2123 ret
= cmd_rotate_get_info(cmd_ctx
->session
, &get_info_return
,
2124 cmd_ctx
->lsm
.u
.get_rotation_info
.rotation_id
);
2130 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &get_info_return
,
2131 sizeof(get_info_return
));
2140 case LTTNG_ROTATION_SET_SCHEDULE
:
2143 enum lttng_rotation_schedule_type schedule_type
;
2146 if (cmd_ctx
->session
->kernel_session
&& !check_rotate_compatible()) {
2147 DBG("Kernel tracer version does not support session rotations");
2148 ret
= LTTNG_ERR_ROTATION_WRONG_VERSION
;
2152 set_schedule
= cmd_ctx
->lsm
.u
.rotation_set_schedule
.set
== 1;
2153 schedule_type
= (enum lttng_rotation_schedule_type
) cmd_ctx
->lsm
.u
.rotation_set_schedule
.type
;
2154 value
= cmd_ctx
->lsm
.u
.rotation_set_schedule
.value
;
2156 ret
= cmd_rotation_set_schedule(cmd_ctx
->session
,
2160 notification_thread_handle
);
2161 if (ret
!= LTTNG_OK
) {
2167 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES
:
2169 struct lttng_session_list_schedules_return schedules
= {
2170 .periodic
.set
= !!cmd_ctx
->session
->rotate_timer_period
,
2171 .periodic
.value
= cmd_ctx
->session
->rotate_timer_period
,
2172 .size
.set
= !!cmd_ctx
->session
->rotate_size
,
2173 .size
.value
= cmd_ctx
->session
->rotate_size
,
2176 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &schedules
,
2186 case LTTNG_CLEAR_SESSION
:
2188 ret
= cmd_clear_session(cmd_ctx
->session
, sock
);
2191 case LTTNG_LIST_TRIGGERS
:
2193 struct lttng_triggers
*return_triggers
= NULL
;
2194 size_t original_payload_size
;
2195 size_t payload_size
;
2197 ret
= setup_empty_lttng_msg(cmd_ctx
);
2199 ret
= LTTNG_ERR_NOMEM
;
2203 original_payload_size
= cmd_ctx
->reply_payload
.buffer
.size
;
2205 ret
= cmd_list_triggers(cmd_ctx
,
2206 notification_thread_handle
, &return_triggers
);
2207 if (ret
!= LTTNG_OK
) {
2211 assert(return_triggers
);
2212 ret
= lttng_triggers_serialize(
2213 return_triggers
, &cmd_ctx
->reply_payload
);
2214 lttng_triggers_destroy(return_triggers
);
2216 ERR("Failed to serialize triggers in reply to `list triggers` command");
2217 ret
= LTTNG_ERR_NOMEM
;
2221 payload_size
= cmd_ctx
->reply_payload
.buffer
.size
-
2222 original_payload_size
;
2224 update_lttng_msg(cmd_ctx
, 0, payload_size
);
2230 ret
= LTTNG_ERR_UND
;
2235 if (cmd_ctx
->reply_payload
.buffer
.size
== 0) {
2236 DBG("Missing llm header, creating one.");
2237 if (setup_lttng_msg_no_cmd_header(cmd_ctx
, NULL
, 0) < 0) {
2241 /* Set return code */
2242 ((struct lttcomm_lttng_msg
*) (cmd_ctx
->reply_payload
.buffer
.data
))->ret_code
= ret
;
2244 if (cmd_ctx
->session
) {
2245 session_unlock(cmd_ctx
->session
);
2246 session_put(cmd_ctx
->session
);
2247 cmd_ctx
->session
= NULL
;
2249 if (need_tracing_session
) {
2250 session_unlock_list();
2253 assert(!rcu_read_ongoing());
2257 static int create_client_sock(void)
2259 int ret
, client_sock
;
2260 const mode_t old_umask
= umask(0);
2262 /* Create client tool unix socket */
2263 client_sock
= lttcomm_create_unix_sock(config
.client_unix_sock_path
.value
);
2264 if (client_sock
< 0) {
2265 ERR("Create unix sock failed: %s", config
.client_unix_sock_path
.value
);
2270 /* Set the cloexec flag */
2271 ret
= utils_set_fd_cloexec(client_sock
);
2273 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
2274 "Continuing but note that the consumer daemon will have a "
2275 "reference to this socket on exec()", client_sock
);
2278 /* File permission MUST be 660 */
2279 ret
= chmod(config
.client_unix_sock_path
.value
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
2281 ERR("Set file permissions failed: %s",
2282 config
.client_unix_sock_path
.value
);
2284 (void) lttcomm_close_unix_sock(client_sock
);
2288 DBG("Created client socket (fd = %i)", client_sock
);
2295 static void cleanup_client_thread(void *data
)
2297 struct lttng_pipe
*quit_pipe
= data
;
2299 lttng_pipe_destroy(quit_pipe
);
2302 static void thread_init_cleanup(void *data
)
2304 set_thread_status(false);
2308 * This thread manage all clients request using the unix client socket for
2311 static void *thread_manage_clients(void *data
)
2313 int sock
= -1, ret
, i
, pollfd
, err
= -1;
2315 uint32_t revents
, nb_fd
;
2316 struct lttng_poll_event events
;
2317 const int client_sock
= thread_state
.client_sock
;
2318 struct lttng_pipe
*quit_pipe
= data
;
2319 const int thread_quit_pipe_fd
= lttng_pipe_get_readfd(quit_pipe
);
2320 struct command_ctx cmd_ctx
= {};
2322 DBG("[thread] Manage client started");
2324 lttng_payload_init(&cmd_ctx
.reply_payload
);
2326 is_root
= (getuid() == 0);
2328 pthread_cleanup_push(thread_init_cleanup
, NULL
);
2330 rcu_register_thread();
2332 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_CMD
);
2334 health_code_update();
2336 ret
= lttcomm_listen_unix_sock(client_sock
);
2342 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
2343 * more will be added to this poll set.
2345 ret
= lttng_poll_create(&events
, 2, LTTNG_CLOEXEC
);
2347 goto error_create_poll
;
2350 /* Add the application registration socket */
2351 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
2356 /* Add thread quit pipe */
2357 ret
= lttng_poll_add(&events
, thread_quit_pipe_fd
, LPOLLIN
| LPOLLERR
);
2362 /* Set state as running. */
2363 set_thread_status(true);
2364 pthread_cleanup_pop(0);
2366 /* This testpoint is after we signal readiness to the parent. */
2367 if (testpoint(sessiond_thread_manage_clients
)) {
2371 if (testpoint(sessiond_thread_manage_clients_before_loop
)) {
2375 health_code_update();
2378 const struct cmd_completion_handler
*cmd_completion_handler
;
2380 cmd_ctx
.creds
= (lttng_sock_cred
) {
2384 cmd_ctx
.session
= NULL
;
2385 lttng_payload_clear(&cmd_ctx
.reply_payload
);
2386 cmd_ctx
.lttng_msg_size
= 0;
2388 DBG("Accepting client command ...");
2390 /* Inifinite blocking call, waiting for transmission */
2392 health_poll_entry();
2393 ret
= lttng_poll_wait(&events
, -1);
2397 * Restart interrupted system call.
2399 if (errno
== EINTR
) {
2407 for (i
= 0; i
< nb_fd
; i
++) {
2408 revents
= LTTNG_POLL_GETEV(&events
, i
);
2409 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2411 health_code_update();
2413 if (pollfd
== thread_quit_pipe_fd
) {
2417 /* Event on the registration socket */
2418 if (revents
& LPOLLIN
) {
2420 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2421 ERR("Client socket poll error");
2424 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
2430 DBG("Wait for client response");
2432 health_code_update();
2434 sock
= lttcomm_accept_unix_sock(client_sock
);
2440 * Set the CLOEXEC flag. Return code is useless because either way, the
2443 (void) utils_set_fd_cloexec(sock
);
2445 /* Set socket option for credentials retrieval */
2446 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
2451 health_code_update();
2454 * Data is received from the lttng client. The struct
2455 * lttcomm_session_msg (lsm) contains the command and data request of
2458 DBG("Receiving data from client ...");
2459 ret
= lttcomm_recv_creds_unix_sock(sock
, &cmd_ctx
.lsm
,
2460 sizeof(struct lttcomm_session_msg
), &cmd_ctx
.creds
);
2461 if (ret
!= sizeof(struct lttcomm_session_msg
)) {
2462 DBG("Incomplete recv() from client... continuing");
2471 health_code_update();
2473 // TODO: Validate cmd_ctx including sanity check for
2474 // security purpose.
2476 rcu_thread_online();
2478 * This function dispatch the work to the kernel or userspace tracer
2479 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2480 * informations for the client. The command context struct contains
2481 * everything this function may needs.
2483 ret
= process_client_msg(&cmd_ctx
, &sock
, &sock_error
);
2484 rcu_thread_offline();
2494 * TODO: Inform client somehow of the fatal error. At
2495 * this point, ret < 0 means that a zmalloc failed
2496 * (ENOMEM). Error detected but still accept
2497 * command, unless a socket error has been
2503 cmd_completion_handler
= cmd_pop_completion_handler();
2504 if (cmd_completion_handler
) {
2505 enum lttng_error_code completion_code
;
2507 completion_code
= cmd_completion_handler
->run(
2508 cmd_completion_handler
->data
);
2509 if (completion_code
!= LTTNG_OK
) {
2514 health_code_update();
2517 struct lttng_payload_view view
=
2518 lttng_payload_view_from_payload(
2519 &cmd_ctx
.reply_payload
,
2521 struct lttcomm_lttng_msg
*llm
= (typeof(
2522 llm
)) cmd_ctx
.reply_payload
.buffer
.data
;
2524 assert(cmd_ctx
.reply_payload
.buffer
.size
>=
2526 assert(cmd_ctx
.lttng_msg_size
== cmd_ctx
.reply_payload
.buffer
.size
);
2528 llm
->fd_count
= lttng_payload_view_get_fd_handle_count(&view
);
2530 DBG("Sending response (size: %d, retcode: %s (%d))",
2531 cmd_ctx
.lttng_msg_size
,
2532 lttng_strerror(-llm
->ret_code
),
2534 ret
= send_unix_sock(sock
, &view
);
2536 ERR("Failed to send data back to client");
2539 /* End of transmission */
2547 health_code_update();
2559 lttng_poll_clean(&events
);
2563 unlink(config
.client_unix_sock_path
.value
);
2564 ret
= close(client_sock
);
2571 ERR("Health error occurred in %s", __func__
);
2574 health_unregister(health_sessiond
);
2576 DBG("Client thread dying");
2577 lttng_payload_reset(&cmd_ctx
.reply_payload
);
2578 rcu_unregister_thread();
2583 bool shutdown_client_thread(void *thread_data
)
2585 struct lttng_pipe
*client_quit_pipe
= thread_data
;
2586 const int write_fd
= lttng_pipe_get_writefd(client_quit_pipe
);
2588 return notify_thread_pipe(write_fd
) == 1;
2591 struct lttng_thread
*launch_client_thread(void)
2593 bool thread_running
;
2594 struct lttng_pipe
*client_quit_pipe
;
2595 struct lttng_thread
*thread
= NULL
;
2596 int client_sock_fd
= -1;
2598 sem_init(&thread_state
.ready
, 0, 0);
2599 client_quit_pipe
= lttng_pipe_open(FD_CLOEXEC
);
2600 if (!client_quit_pipe
) {
2604 client_sock_fd
= create_client_sock();
2605 if (client_sock_fd
< 0) {
2609 thread_state
.client_sock
= client_sock_fd
;
2610 thread
= lttng_thread_create("Client management",
2611 thread_manage_clients
,
2612 shutdown_client_thread
,
2613 cleanup_client_thread
,
2618 /* The client thread now owns the client sock fd and the quit pipe. */
2619 client_sock_fd
= -1;
2620 client_quit_pipe
= NULL
;
2623 * This thread is part of the threads that need to be fully
2624 * initialized before the session daemon is marked as "ready".
2626 thread_running
= wait_thread_status();
2627 if (!thread_running
) {
2632 if (client_sock_fd
>= 0) {
2633 if (close(client_sock_fd
)) {
2634 PERROR("Failed to close client socket");
2637 lttng_thread_put(thread
);
2638 cleanup_client_thread(client_quit_pipe
);