2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
32 #include <sys/mount.h>
33 #include <sys/resource.h>
34 #include <sys/socket.h>
36 #include <sys/types.h>
38 #include <urcu/uatomic.h>
42 #include <common/common.h>
43 #include <common/compat/socket.h>
44 #include <common/compat/getenv.h>
45 #include <common/defaults.h>
46 #include <common/kernel-consumer/kernel-consumer.h>
47 #include <common/futex.h>
48 #include <common/relayd/relayd.h>
49 #include <common/utils.h>
50 #include <common/daemonize.h>
51 #include <common/config/session-config.h>
53 #include "lttng-sessiond.h"
54 #include "buffer-registry.h"
61 #include "kernel-consumer.h"
65 #include "ust-consumer.h"
68 #include "health-sessiond.h"
69 #include "testpoint.h"
70 #include "ust-thread.h"
71 #include "agent-thread.h"
73 #include "load-session-thread.h"
74 #include "notification-thread.h"
75 #include "notification-thread-commands.h"
76 #include "rotation-thread.h"
77 #include "lttng-syscall.h"
79 #include "ht-cleanup.h"
80 #include "sessiond-config.h"
81 #include "sessiond-timer.h"
83 static const char *help_msg
=
84 #ifdef LTTNG_EMBED_HELP
85 #include <lttng-sessiond.8.h>
92 static pid_t ppid
; /* Parent PID for --sig-parent option */
93 static pid_t child_ppid
; /* Internal parent PID use with daemonize. */
94 static int lockfile_fd
= -1;
96 /* Set to 1 when a SIGUSR1 signal is received. */
97 static int recv_child_signal
;
99 static struct lttng_kernel_tracer_version kernel_tracer_version
;
100 static struct lttng_kernel_tracer_abi_version kernel_tracer_abi_version
;
103 * Consumer daemon specific control data. Every value not initialized here is
104 * set to 0 by the static definition.
106 static struct consumer_data kconsumer_data
= {
107 .type
= LTTNG_CONSUMER_KERNEL
,
110 .channel_monitor_pipe
= -1,
111 .channel_rotate_pipe
= -1,
112 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
113 .lock
= PTHREAD_MUTEX_INITIALIZER
,
114 .cond
= PTHREAD_COND_INITIALIZER
,
115 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
117 static struct consumer_data ustconsumer64_data
= {
118 .type
= LTTNG_CONSUMER64_UST
,
121 .channel_monitor_pipe
= -1,
122 .channel_rotate_pipe
= -1,
123 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
124 .lock
= PTHREAD_MUTEX_INITIALIZER
,
125 .cond
= PTHREAD_COND_INITIALIZER
,
126 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
128 static struct consumer_data ustconsumer32_data
= {
129 .type
= LTTNG_CONSUMER32_UST
,
132 .channel_monitor_pipe
= -1,
133 .channel_rotate_pipe
= -1,
134 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
135 .lock
= PTHREAD_MUTEX_INITIALIZER
,
136 .cond
= PTHREAD_COND_INITIALIZER
,
137 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
140 /* Command line options */
141 static const struct option long_options
[] = {
142 { "client-sock", required_argument
, 0, 'c' },
143 { "apps-sock", required_argument
, 0, 'a' },
144 { "kconsumerd-cmd-sock", required_argument
, 0, '\0' },
145 { "kconsumerd-err-sock", required_argument
, 0, '\0' },
146 { "ustconsumerd32-cmd-sock", required_argument
, 0, '\0' },
147 { "ustconsumerd32-err-sock", required_argument
, 0, '\0' },
148 { "ustconsumerd64-cmd-sock", required_argument
, 0, '\0' },
149 { "ustconsumerd64-err-sock", required_argument
, 0, '\0' },
150 { "consumerd32-path", required_argument
, 0, '\0' },
151 { "consumerd32-libdir", required_argument
, 0, '\0' },
152 { "consumerd64-path", required_argument
, 0, '\0' },
153 { "consumerd64-libdir", required_argument
, 0, '\0' },
154 { "daemonize", no_argument
, 0, 'd' },
155 { "background", no_argument
, 0, 'b' },
156 { "sig-parent", no_argument
, 0, 'S' },
157 { "help", no_argument
, 0, 'h' },
158 { "group", required_argument
, 0, 'g' },
159 { "version", no_argument
, 0, 'V' },
160 { "quiet", no_argument
, 0, 'q' },
161 { "verbose", no_argument
, 0, 'v' },
162 { "verbose-consumer", no_argument
, 0, '\0' },
163 { "no-kernel", no_argument
, 0, '\0' },
164 { "pidfile", required_argument
, 0, 'p' },
165 { "agent-tcp-port", required_argument
, 0, '\0' },
166 { "config", required_argument
, 0, 'f' },
167 { "load", required_argument
, 0, 'l' },
168 { "kmod-probes", required_argument
, 0, '\0' },
169 { "extra-kmod-probes", required_argument
, 0, '\0' },
173 struct sessiond_config config
;
175 /* Command line options to ignore from configuration file */
176 static const char *config_ignore_options
[] = { "help", "version", "config" };
178 /* Shared between threads */
179 static int dispatch_thread_exit
;
181 /* Sockets and FDs */
182 static int client_sock
= -1;
183 static int apps_sock
= -1;
184 int kernel_tracer_fd
= -1;
185 static int kernel_poll_pipe
[2] = { -1, -1 };
188 * Quit pipe for all threads. This permits a single cancellation point
189 * for all threads when receiving an event on the pipe.
191 static int thread_quit_pipe
[2] = { -1, -1 };
194 * This pipe is used to inform the thread managing application communication
195 * that a command is queued and ready to be processed.
197 static int apps_cmd_pipe
[2] = { -1, -1 };
199 int apps_cmd_notify_pipe
[2] = { -1, -1 };
201 /* Pthread, Mutexes and Semaphores */
202 static pthread_t apps_thread
;
203 static pthread_t apps_notify_thread
;
204 static pthread_t reg_apps_thread
;
205 static pthread_t client_thread
;
206 static pthread_t kernel_thread
;
207 static pthread_t dispatch_thread
;
208 static pthread_t health_thread
;
209 static pthread_t ht_cleanup_thread
;
210 static pthread_t agent_reg_thread
;
211 static pthread_t load_session_thread
;
212 static pthread_t notification_thread
;
213 static pthread_t rotation_thread
;
214 static pthread_t timer_thread
;
217 * UST registration command queue. This queue is tied with a futex and uses a N
218 * wakers / 1 waiter implemented and detailed in futex.c/.h
220 * The thread_registration_apps and thread_dispatch_ust_registration uses this
221 * queue along with the wait/wake scheme. The thread_manage_apps receives down
222 * the line new application socket and monitors it for any I/O error or clean
223 * close that triggers an unregistration of the application.
225 static struct ust_cmd_queue ust_cmd_queue
;
228 * Pointer initialized before thread creation.
230 * This points to the tracing session list containing the session count and a
231 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
232 * MUST NOT be taken if you call a public function in session.c.
234 * The lock is nested inside the structure: session_list_ptr->lock. Please use
235 * session_lock_list and session_unlock_list for lock acquisition.
237 static struct ltt_session_list
*session_list_ptr
;
239 int ust_consumerd64_fd
= -1;
240 int ust_consumerd32_fd
= -1;
242 static const char *module_proc_lttng
= "/proc/lttng";
245 * Consumer daemon state which is changed when spawning it, killing it or in
246 * case of a fatal error.
248 enum consumerd_state
{
249 CONSUMER_STARTED
= 1,
250 CONSUMER_STOPPED
= 2,
255 * This consumer daemon state is used to validate if a client command will be
256 * able to reach the consumer. If not, the client is informed. For instance,
257 * doing a "lttng start" when the consumer state is set to ERROR will return an
258 * error to the client.
260 * The following example shows a possible race condition of this scheme:
262 * consumer thread error happens
264 * client cmd checks state -> still OK
265 * consumer thread exit, sets error
266 * client cmd try to talk to consumer
269 * However, since the consumer is a different daemon, we have no way of making
270 * sure the command will reach it safely even with this state flag. This is why
271 * we consider that up to the state validation during command processing, the
272 * command is safe. After that, we can not guarantee the correctness of the
273 * client request vis-a-vis the consumer.
275 static enum consumerd_state ust_consumerd_state
;
276 static enum consumerd_state kernel_consumerd_state
;
278 /* Set in main() with the current page size. */
281 /* Application health monitoring */
282 struct health_app
*health_sessiond
;
284 /* Am I root or not. */
285 int is_root
; /* Set to 1 if the daemon is running as root */
287 const char * const config_section_name
= "sessiond";
289 /* Load session thread information to operate. */
290 struct load_session_thread_data
*load_info
;
292 /* Notification thread handle. */
293 struct notification_thread_handle
*notification_thread_handle
;
295 /* Rotation thread handle. */
296 struct rotation_thread_handle
*rotation_thread_handle
;
298 /* Global hash tables */
299 struct lttng_ht
*agent_apps_ht_by_sock
= NULL
;
302 * The initialization of the session daemon is done in multiple phases.
304 * While all threads are launched near-simultaneously, only some of them
305 * are needed to ensure the session daemon can start to respond to client
308 * There are two important guarantees that we wish to offer with respect
309 * to the initialisation of the session daemon:
310 * - When the daemonize/background launcher process exits, the sessiond
311 * is fully able to respond to client requests,
312 * - Auto-loaded sessions are visible to clients.
314 * In order to achieve this, a number of support threads have to be launched
315 * to allow the "client" thread to function properly. Moreover, since the
316 * "load session" thread needs the client thread, we must provide a way
317 * for the "load session" thread to know that the "client" thread is up
320 * Hence, the support threads decrement the lttng_sessiond_ready counter
321 * while the "client" threads waits for it to reach 0. Once the "client" thread
322 * unblocks, it posts the message_thread_ready semaphore which allows the
323 * "load session" thread to progress.
325 * This implies that the "load session" thread is the last to be initialized
326 * and will explicitly call sessiond_signal_parents(), which signals the parents
327 * that the session daemon is fully initialized.
329 * The four (4) support threads are:
331 * - notification_thread
335 #define NR_LTTNG_SESSIOND_SUPPORT_THREADS 4
336 int lttng_sessiond_ready
= NR_LTTNG_SESSIOND_SUPPORT_THREADS
;
338 int sessiond_check_thread_quit_pipe(int fd
, uint32_t events
)
340 return (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) ? 1 : 0;
343 /* Notify parents that we are ready for cmd and health check */
345 void sessiond_signal_parents(void)
348 * Notify parent pid that we are ready to accept command
349 * for client side. This ppid is the one from the
350 * external process that spawned us.
352 if (config
.sig_parent
) {
357 * Notify the parent of the fork() process that we are
360 if (config
.daemonize
|| config
.background
) {
361 kill(child_ppid
, SIGUSR1
);
366 void sessiond_notify_ready(void)
369 * This memory barrier is paired with the one performed by
370 * the client thread after it has seen that 'lttng_sessiond_ready' is 0.
372 * The purpose of these memory barriers is to ensure that all
373 * initialization operations of the various threads that call this
374 * function to signal that they are ready are commited/published
375 * before the client thread can see the 'lttng_sessiond_ready' counter
378 * Note that this could be a 'write' memory barrier, but a full barrier
379 * is used in case the code using this utility changes. The performance
380 * implications of this choice are minimal since this is a slow path.
383 uatomic_sub(<tng_sessiond_ready
, 1);
387 int __sessiond_set_thread_pollset(struct lttng_poll_event
*events
, size_t size
,
394 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
400 ret
= lttng_poll_add(events
, a_pipe
[0], LPOLLIN
| LPOLLERR
);
412 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
414 int sessiond_set_thread_pollset(struct lttng_poll_event
*events
, size_t size
)
416 return __sessiond_set_thread_pollset(events
, size
, thread_quit_pipe
);
420 * Init thread quit pipe.
422 * Return -1 on error or 0 if all pipes are created.
424 static int __init_thread_quit_pipe(int *a_pipe
)
430 PERROR("thread quit pipe");
434 for (i
= 0; i
< 2; i
++) {
435 ret
= fcntl(a_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
446 static int init_thread_quit_pipe(void)
448 return __init_thread_quit_pipe(thread_quit_pipe
);
452 * Stop all threads by closing the thread quit pipe.
454 static void stop_threads(void)
458 /* Stopping all threads */
459 DBG("Terminating all threads");
460 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
462 ERR("write error on thread quit pipe");
465 /* Dispatch thread */
466 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
467 futex_nto1_wake(&ust_cmd_queue
.futex
);
471 * Close every consumer sockets.
473 static void close_consumer_sockets(void)
477 if (kconsumer_data
.err_sock
>= 0) {
478 ret
= close(kconsumer_data
.err_sock
);
480 PERROR("kernel consumer err_sock close");
483 if (ustconsumer32_data
.err_sock
>= 0) {
484 ret
= close(ustconsumer32_data
.err_sock
);
486 PERROR("UST consumerd32 err_sock close");
489 if (ustconsumer64_data
.err_sock
>= 0) {
490 ret
= close(ustconsumer64_data
.err_sock
);
492 PERROR("UST consumerd64 err_sock close");
495 if (kconsumer_data
.cmd_sock
>= 0) {
496 ret
= close(kconsumer_data
.cmd_sock
);
498 PERROR("kernel consumer cmd_sock close");
501 if (ustconsumer32_data
.cmd_sock
>= 0) {
502 ret
= close(ustconsumer32_data
.cmd_sock
);
504 PERROR("UST consumerd32 cmd_sock close");
507 if (ustconsumer64_data
.cmd_sock
>= 0) {
508 ret
= close(ustconsumer64_data
.cmd_sock
);
510 PERROR("UST consumerd64 cmd_sock close");
513 if (kconsumer_data
.channel_monitor_pipe
>= 0) {
514 ret
= close(kconsumer_data
.channel_monitor_pipe
);
516 PERROR("kernel consumer channel monitor pipe close");
519 if (ustconsumer32_data
.channel_monitor_pipe
>= 0) {
520 ret
= close(ustconsumer32_data
.channel_monitor_pipe
);
522 PERROR("UST consumerd32 channel monitor pipe close");
525 if (ustconsumer64_data
.channel_monitor_pipe
>= 0) {
526 ret
= close(ustconsumer64_data
.channel_monitor_pipe
);
528 PERROR("UST consumerd64 channel monitor pipe close");
531 if (kconsumer_data
.channel_rotate_pipe
>= 0) {
532 ret
= close(kconsumer_data
.channel_rotate_pipe
);
534 PERROR("kernel consumer channel rotate pipe close");
537 if (ustconsumer32_data
.channel_rotate_pipe
>= 0) {
538 ret
= close(ustconsumer32_data
.channel_rotate_pipe
);
540 PERROR("UST consumerd32 channel rotate pipe close");
543 if (ustconsumer64_data
.channel_rotate_pipe
>= 0) {
544 ret
= close(ustconsumer64_data
.channel_rotate_pipe
);
546 PERROR("UST consumerd64 channel rotate pipe close");
552 * Wait on consumer process termination.
554 * Need to be called with the consumer data lock held or from a context
555 * ensuring no concurrent access to data (e.g: cleanup).
557 static void wait_consumer(struct consumer_data
*consumer_data
)
562 if (consumer_data
->pid
<= 0) {
566 DBG("Waiting for complete teardown of consumerd (PID: %d)",
568 ret
= waitpid(consumer_data
->pid
, &status
, 0);
570 PERROR("consumerd waitpid pid: %d", consumer_data
->pid
)
571 } else if (!WIFEXITED(status
)) {
572 ERR("consumerd termination with error: %d",
575 consumer_data
->pid
= 0;
579 * Cleanup the session daemon's data structures.
581 static void sessiond_cleanup(void)
584 struct ltt_session
*sess
, *stmp
;
586 DBG("Cleanup sessiond");
589 * Close the thread quit pipe. It has already done its job,
590 * since we are now called.
592 utils_close_pipe(thread_quit_pipe
);
595 * If config.pid_file_path.value is undefined, the default file will be
596 * wiped when removing the rundir.
598 if (config
.pid_file_path
.value
) {
599 ret
= remove(config
.pid_file_path
.value
);
601 PERROR("remove pidfile %s", config
.pid_file_path
.value
);
605 DBG("Removing sessiond and consumerd content of directory %s",
606 config
.rundir
.value
);
609 DBG("Removing %s", config
.pid_file_path
.value
);
610 (void) unlink(config
.pid_file_path
.value
);
612 DBG("Removing %s", config
.agent_port_file_path
.value
);
613 (void) unlink(config
.agent_port_file_path
.value
);
616 DBG("Removing %s", kconsumer_data
.err_unix_sock_path
);
617 (void) unlink(kconsumer_data
.err_unix_sock_path
);
619 DBG("Removing directory %s", config
.kconsumerd_path
.value
);
620 (void) rmdir(config
.kconsumerd_path
.value
);
622 /* ust consumerd 32 */
623 DBG("Removing %s", config
.consumerd32_err_unix_sock_path
.value
);
624 (void) unlink(config
.consumerd32_err_unix_sock_path
.value
);
626 DBG("Removing directory %s", config
.consumerd32_path
.value
);
627 (void) rmdir(config
.consumerd32_path
.value
);
629 /* ust consumerd 64 */
630 DBG("Removing %s", config
.consumerd64_err_unix_sock_path
.value
);
631 (void) unlink(config
.consumerd64_err_unix_sock_path
.value
);
633 DBG("Removing directory %s", config
.consumerd64_path
.value
);
634 (void) rmdir(config
.consumerd64_path
.value
);
636 DBG("Cleaning up all sessions");
638 /* Destroy session list mutex */
639 if (session_list_ptr
!= NULL
) {
640 pthread_mutex_destroy(&session_list_ptr
->lock
);
642 /* Cleanup ALL session */
643 cds_list_for_each_entry_safe(sess
, stmp
,
644 &session_list_ptr
->head
, list
) {
645 cmd_destroy_session(sess
, kernel_poll_pipe
[1],
646 notification_thread_handle
);
650 wait_consumer(&kconsumer_data
);
651 wait_consumer(&ustconsumer64_data
);
652 wait_consumer(&ustconsumer32_data
);
654 DBG("Cleaning up all agent apps");
655 agent_app_ht_clean();
657 DBG("Closing all UST sockets");
658 ust_app_clean_list();
659 buffer_reg_destroy_registries();
661 if (is_root
&& !config
.no_kernel
) {
662 DBG2("Closing kernel fd");
663 if (kernel_tracer_fd
>= 0) {
664 ret
= close(kernel_tracer_fd
);
669 DBG("Unloading kernel modules");
670 modprobe_remove_lttng_all();
674 close_consumer_sockets();
677 load_session_destroy_data(load_info
);
682 * We do NOT rmdir rundir because there are other processes
683 * using it, for instance lttng-relayd, which can start in
684 * parallel with this teardown.
689 * Cleanup the daemon's option data structures.
691 static void sessiond_cleanup_options(void)
693 DBG("Cleaning up options");
695 sessiond_config_fini(&config
);
697 run_as_destroy_worker();
701 * Send data on a unix socket using the liblttsessiondcomm API.
703 * Return lttcomm error code.
705 static int send_unix_sock(int sock
, void *buf
, size_t len
)
707 /* Check valid length */
712 return lttcomm_send_unix_sock(sock
, buf
, len
);
716 * Free memory of a command context structure.
718 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
720 DBG("Clean command context structure");
722 if ((*cmd_ctx
)->llm
) {
723 free((*cmd_ctx
)->llm
);
725 if ((*cmd_ctx
)->lsm
) {
726 free((*cmd_ctx
)->lsm
);
734 * Notify UST applications using the shm mmap futex.
736 static int notify_ust_apps(int active
)
740 DBG("Notifying applications of session daemon state: %d", active
);
742 /* See shm.c for this call implying mmap, shm and futex calls */
743 wait_shm_mmap
= shm_ust_get_mmap(config
.wait_shm_path
.value
, is_root
);
744 if (wait_shm_mmap
== NULL
) {
748 /* Wake waiting process */
749 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
751 /* Apps notified successfully */
759 * Setup the outgoing data buffer for the response (llm) by allocating the
760 * right amount of memory and copying the original information from the lsm
763 * Return 0 on success, negative value on error.
765 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
,
766 const void *payload_buf
, size_t payload_len
,
767 const void *cmd_header_buf
, size_t cmd_header_len
)
770 const size_t header_len
= sizeof(struct lttcomm_lttng_msg
);
771 const size_t cmd_header_offset
= header_len
;
772 const size_t payload_offset
= cmd_header_offset
+ cmd_header_len
;
773 const size_t total_msg_size
= header_len
+ cmd_header_len
+ payload_len
;
775 cmd_ctx
->llm
= zmalloc(total_msg_size
);
777 if (cmd_ctx
->llm
== NULL
) {
783 /* Copy common data */
784 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
785 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
786 cmd_ctx
->llm
->cmd_header_size
= cmd_header_len
;
787 cmd_ctx
->llm
->data_size
= payload_len
;
788 cmd_ctx
->lttng_msg_size
= total_msg_size
;
790 /* Copy command header */
791 if (cmd_header_len
) {
792 memcpy(((uint8_t *) cmd_ctx
->llm
) + cmd_header_offset
, cmd_header_buf
,
798 memcpy(((uint8_t *) cmd_ctx
->llm
) + payload_offset
, payload_buf
,
807 * Version of setup_lttng_msg() without command header.
809 static int setup_lttng_msg_no_cmd_header(struct command_ctx
*cmd_ctx
,
810 void *payload_buf
, size_t payload_len
)
812 return setup_lttng_msg(cmd_ctx
, payload_buf
, payload_len
, NULL
, 0);
815 * Update the kernel poll set of all channel fd available over all tracing
816 * session. Add the wakeup pipe at the end of the set.
818 static int update_kernel_poll(struct lttng_poll_event
*events
)
821 struct ltt_session
*session
;
822 struct ltt_kernel_channel
*channel
;
824 DBG("Updating kernel poll set");
827 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
828 session_lock(session
);
829 if (session
->kernel_session
== NULL
) {
830 session_unlock(session
);
834 cds_list_for_each_entry(channel
,
835 &session
->kernel_session
->channel_list
.head
, list
) {
836 /* Add channel fd to the kernel poll set */
837 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
839 session_unlock(session
);
842 DBG("Channel fd %d added to kernel set", channel
->fd
);
844 session_unlock(session
);
846 session_unlock_list();
851 session_unlock_list();
856 * Find the channel fd from 'fd' over all tracing session. When found, check
857 * for new channel stream and send those stream fds to the kernel consumer.
859 * Useful for CPU hotplug feature.
861 static int update_kernel_stream(int fd
)
864 struct ltt_session
*session
;
865 struct ltt_kernel_session
*ksess
;
866 struct ltt_kernel_channel
*channel
;
868 DBG("Updating kernel streams for channel fd %d", fd
);
871 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
872 session_lock(session
);
873 if (session
->kernel_session
== NULL
) {
874 session_unlock(session
);
877 ksess
= session
->kernel_session
;
879 cds_list_for_each_entry(channel
,
880 &ksess
->channel_list
.head
, list
) {
881 struct lttng_ht_iter iter
;
882 struct consumer_socket
*socket
;
884 if (channel
->fd
!= fd
) {
887 DBG("Channel found, updating kernel streams");
888 ret
= kernel_open_channel_stream(channel
);
892 /* Update the stream global counter */
893 ksess
->stream_count_global
+= ret
;
896 * Have we already sent fds to the consumer? If yes, it
897 * means that tracing is started so it is safe to send
898 * our updated stream fds.
900 if (ksess
->consumer_fds_sent
!= 1
901 || ksess
->consumer
== NULL
) {
907 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
,
908 &iter
.iter
, socket
, node
.node
) {
909 pthread_mutex_lock(socket
->lock
);
910 ret
= kernel_consumer_send_channel_streams(socket
,
912 session
->output_traces
? 1 : 0);
913 pthread_mutex_unlock(socket
->lock
);
921 session_unlock(session
);
923 session_unlock_list();
927 session_unlock(session
);
928 session_unlock_list();
933 * For each tracing session, update newly registered apps. The session list
934 * lock MUST be acquired before calling this.
936 static void update_ust_app(int app_sock
)
938 struct ltt_session
*sess
, *stmp
;
940 /* Consumer is in an ERROR state. Stop any application update. */
941 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
942 /* Stop the update process since the consumer is dead. */
946 /* For all tracing session(s) */
947 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
951 if (!sess
->ust_session
) {
956 assert(app_sock
>= 0);
957 app
= ust_app_find_by_sock(app_sock
);
960 * Application can be unregistered before so
961 * this is possible hence simply stopping the
964 DBG3("UST app update failed to find app sock %d",
968 ust_app_global_update(sess
->ust_session
, app
);
972 session_unlock(sess
);
977 * This thread manage event coming from the kernel.
979 * Features supported in this thread:
982 static void *thread_manage_kernel(void *data
)
984 int ret
, i
, pollfd
, update_poll_flag
= 1, err
= -1;
985 uint32_t revents
, nb_fd
;
987 struct lttng_poll_event events
;
989 DBG("[thread] Thread manage kernel started");
991 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_KERNEL
);
994 * This first step of the while is to clean this structure which could free
995 * non NULL pointers so initialize it before the loop.
997 lttng_poll_init(&events
);
999 if (testpoint(sessiond_thread_manage_kernel
)) {
1000 goto error_testpoint
;
1003 health_code_update();
1005 if (testpoint(sessiond_thread_manage_kernel_before_loop
)) {
1006 goto error_testpoint
;
1010 health_code_update();
1012 if (update_poll_flag
== 1) {
1013 /* Clean events object. We are about to populate it again. */
1014 lttng_poll_clean(&events
);
1016 ret
= sessiond_set_thread_pollset(&events
, 2);
1018 goto error_poll_create
;
1021 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
1026 /* This will add the available kernel channel if any. */
1027 ret
= update_kernel_poll(&events
);
1031 update_poll_flag
= 0;
1034 DBG("Thread kernel polling");
1036 /* Poll infinite value of time */
1038 health_poll_entry();
1039 ret
= lttng_poll_wait(&events
, -1);
1040 DBG("Thread kernel return from poll on %d fds",
1041 LTTNG_POLL_GETNB(&events
));
1045 * Restart interrupted system call.
1047 if (errno
== EINTR
) {
1051 } else if (ret
== 0) {
1052 /* Should not happen since timeout is infinite */
1053 ERR("Return value of poll is 0 with an infinite timeout.\n"
1054 "This should not have happened! Continuing...");
1060 for (i
= 0; i
< nb_fd
; i
++) {
1061 /* Fetch once the poll data */
1062 revents
= LTTNG_POLL_GETEV(&events
, i
);
1063 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1065 health_code_update();
1068 /* No activity for this FD (poll implementation). */
1072 /* Thread quit pipe has been closed. Killing thread. */
1073 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1079 /* Check for data on kernel pipe */
1080 if (revents
& LPOLLIN
) {
1081 if (pollfd
== kernel_poll_pipe
[0]) {
1082 (void) lttng_read(kernel_poll_pipe
[0],
1085 * Ret value is useless here, if this pipe gets any actions an
1086 * update is required anyway.
1088 update_poll_flag
= 1;
1092 * New CPU detected by the kernel. Adding kernel stream to
1093 * kernel session and updating the kernel consumer
1095 ret
= update_kernel_stream(pollfd
);
1101 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1102 update_poll_flag
= 1;
1105 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1113 lttng_poll_clean(&events
);
1116 utils_close_pipe(kernel_poll_pipe
);
1117 kernel_poll_pipe
[0] = kernel_poll_pipe
[1] = -1;
1120 ERR("Health error occurred in %s", __func__
);
1121 WARN("Kernel thread died unexpectedly. "
1122 "Kernel tracing can continue but CPU hotplug is disabled.");
1124 health_unregister(health_sessiond
);
1125 DBG("Kernel thread dying");
1130 * Signal pthread condition of the consumer data that the thread.
1132 static void signal_consumer_condition(struct consumer_data
*data
, int state
)
1134 pthread_mutex_lock(&data
->cond_mutex
);
1137 * The state is set before signaling. It can be any value, it's the waiter
1138 * job to correctly interpret this condition variable associated to the
1139 * consumer pthread_cond.
1141 * A value of 0 means that the corresponding thread of the consumer data
1142 * was not started. 1 indicates that the thread has started and is ready
1143 * for action. A negative value means that there was an error during the
1146 data
->consumer_thread_is_ready
= state
;
1147 (void) pthread_cond_signal(&data
->cond
);
1149 pthread_mutex_unlock(&data
->cond_mutex
);
1153 * This thread manage the consumer error sent back to the session daemon.
1155 static void *thread_manage_consumer(void *data
)
1157 int sock
= -1, i
, ret
, pollfd
, err
= -1, should_quit
= 0;
1158 uint32_t revents
, nb_fd
;
1159 enum lttcomm_return_code code
;
1160 struct lttng_poll_event events
;
1161 struct consumer_data
*consumer_data
= data
;
1162 struct consumer_socket
*cmd_socket_wrapper
= NULL
;
1164 DBG("[thread] Manage consumer started");
1166 rcu_register_thread();
1167 rcu_thread_online();
1169 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_CONSUMER
);
1171 health_code_update();
1174 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
1175 * metadata_sock. Nothing more will be added to this poll set.
1177 ret
= sessiond_set_thread_pollset(&events
, 3);
1183 * The error socket here is already in a listening state which was done
1184 * just before spawning this thread to avoid a race between the consumer
1185 * daemon exec trying to connect and the listen() call.
1187 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
1192 health_code_update();
1194 /* Infinite blocking call, waiting for transmission */
1196 health_poll_entry();
1198 if (testpoint(sessiond_thread_manage_consumer
)) {
1202 ret
= lttng_poll_wait(&events
, -1);
1206 * Restart interrupted system call.
1208 if (errno
== EINTR
) {
1216 for (i
= 0; i
< nb_fd
; i
++) {
1217 /* Fetch once the poll data */
1218 revents
= LTTNG_POLL_GETEV(&events
, i
);
1219 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1221 health_code_update();
1224 /* No activity for this FD (poll implementation). */
1228 /* Thread quit pipe has been closed. Killing thread. */
1229 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1235 /* Event on the registration socket */
1236 if (pollfd
== consumer_data
->err_sock
) {
1237 if (revents
& LPOLLIN
) {
1239 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1240 ERR("consumer err socket poll error");
1243 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1249 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
1255 * Set the CLOEXEC flag. Return code is useless because either way, the
1258 (void) utils_set_fd_cloexec(sock
);
1260 health_code_update();
1262 DBG2("Receiving code from consumer err_sock");
1264 /* Getting status code from kconsumerd */
1265 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1266 sizeof(enum lttcomm_return_code
));
1271 health_code_update();
1272 if (code
!= LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
) {
1273 ERR("consumer error when waiting for SOCK_READY : %s",
1274 lttcomm_get_readable_code(-code
));
1278 /* Connect both command and metadata sockets. */
1279 consumer_data
->cmd_sock
=
1280 lttcomm_connect_unix_sock(
1281 consumer_data
->cmd_unix_sock_path
);
1282 consumer_data
->metadata_fd
=
1283 lttcomm_connect_unix_sock(
1284 consumer_data
->cmd_unix_sock_path
);
1285 if (consumer_data
->cmd_sock
< 0 || consumer_data
->metadata_fd
< 0) {
1286 PERROR("consumer connect cmd socket");
1287 /* On error, signal condition and quit. */
1288 signal_consumer_condition(consumer_data
, -1);
1292 consumer_data
->metadata_sock
.fd_ptr
= &consumer_data
->metadata_fd
;
1294 /* Create metadata socket lock. */
1295 consumer_data
->metadata_sock
.lock
= zmalloc(sizeof(pthread_mutex_t
));
1296 if (consumer_data
->metadata_sock
.lock
== NULL
) {
1297 PERROR("zmalloc pthread mutex");
1300 pthread_mutex_init(consumer_data
->metadata_sock
.lock
, NULL
);
1302 DBG("Consumer command socket ready (fd: %d", consumer_data
->cmd_sock
);
1303 DBG("Consumer metadata socket ready (fd: %d)",
1304 consumer_data
->metadata_fd
);
1307 * Remove the consumerd error sock since we've established a connection.
1309 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1314 /* Add new accepted error socket. */
1315 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1320 /* Add metadata socket that is successfully connected. */
1321 ret
= lttng_poll_add(&events
, consumer_data
->metadata_fd
,
1322 LPOLLIN
| LPOLLRDHUP
);
1327 health_code_update();
1330 * Transfer the write-end of the channel monitoring and rotate pipe
1331 * to the consumer by issuing a SET_CHANNEL_MONITOR_PIPE and
1332 * SET_CHANNEL_ROTATE_PIPE commands.
1334 cmd_socket_wrapper
= consumer_allocate_socket(&consumer_data
->cmd_sock
);
1335 if (!cmd_socket_wrapper
) {
1338 cmd_socket_wrapper
->lock
= &consumer_data
->lock
;
1340 ret
= consumer_send_channel_monitor_pipe(cmd_socket_wrapper
,
1341 consumer_data
->channel_monitor_pipe
);
1346 ret
= consumer_send_channel_rotate_pipe(cmd_socket_wrapper
,
1347 consumer_data
->channel_rotate_pipe
);
1352 /* Discard the socket wrapper as it is no longer needed. */
1353 consumer_destroy_socket(cmd_socket_wrapper
);
1354 cmd_socket_wrapper
= NULL
;
1356 /* The thread is completely initialized, signal that it is ready. */
1357 signal_consumer_condition(consumer_data
, 1);
1359 /* Infinite blocking call, waiting for transmission */
1362 health_code_update();
1364 /* Exit the thread because the thread quit pipe has been triggered. */
1366 /* Not a health error. */
1371 health_poll_entry();
1372 ret
= lttng_poll_wait(&events
, -1);
1376 * Restart interrupted system call.
1378 if (errno
== EINTR
) {
1386 for (i
= 0; i
< nb_fd
; i
++) {
1387 /* Fetch once the poll data */
1388 revents
= LTTNG_POLL_GETEV(&events
, i
);
1389 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1391 health_code_update();
1394 /* No activity for this FD (poll implementation). */
1399 * Thread quit pipe has been triggered, flag that we should stop
1400 * but continue the current loop to handle potential data from
1403 should_quit
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1405 if (pollfd
== sock
) {
1406 /* Event on the consumerd socket */
1407 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)
1408 && !(revents
& LPOLLIN
)) {
1409 ERR("consumer err socket second poll error");
1412 health_code_update();
1413 /* Wait for any kconsumerd error */
1414 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1415 sizeof(enum lttcomm_return_code
));
1417 ERR("consumer closed the command socket");
1421 ERR("consumer return code : %s",
1422 lttcomm_get_readable_code(-code
));
1425 } else if (pollfd
== consumer_data
->metadata_fd
) {
1426 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)
1427 && !(revents
& LPOLLIN
)) {
1428 ERR("consumer err metadata socket second poll error");
1431 /* UST metadata requests */
1432 ret
= ust_consumer_metadata_request(
1433 &consumer_data
->metadata_sock
);
1435 ERR("Handling metadata request");
1439 /* No need for an else branch all FDs are tested prior. */
1441 health_code_update();
1447 * We lock here because we are about to close the sockets and some other
1448 * thread might be using them so get exclusive access which will abort all
1449 * other consumer command by other threads.
1451 pthread_mutex_lock(&consumer_data
->lock
);
1453 /* Immediately set the consumerd state to stopped */
1454 if (consumer_data
->type
== LTTNG_CONSUMER_KERNEL
) {
1455 uatomic_set(&kernel_consumerd_state
, CONSUMER_ERROR
);
1456 } else if (consumer_data
->type
== LTTNG_CONSUMER64_UST
||
1457 consumer_data
->type
== LTTNG_CONSUMER32_UST
) {
1458 uatomic_set(&ust_consumerd_state
, CONSUMER_ERROR
);
1460 /* Code flow error... */
1464 if (consumer_data
->err_sock
>= 0) {
1465 ret
= close(consumer_data
->err_sock
);
1469 consumer_data
->err_sock
= -1;
1471 if (consumer_data
->cmd_sock
>= 0) {
1472 ret
= close(consumer_data
->cmd_sock
);
1476 consumer_data
->cmd_sock
= -1;
1478 if (consumer_data
->metadata_sock
.fd_ptr
&&
1479 *consumer_data
->metadata_sock
.fd_ptr
>= 0) {
1480 ret
= close(*consumer_data
->metadata_sock
.fd_ptr
);
1492 unlink(consumer_data
->err_unix_sock_path
);
1493 unlink(consumer_data
->cmd_unix_sock_path
);
1494 pthread_mutex_unlock(&consumer_data
->lock
);
1496 /* Cleanup metadata socket mutex. */
1497 if (consumer_data
->metadata_sock
.lock
) {
1498 pthread_mutex_destroy(consumer_data
->metadata_sock
.lock
);
1499 free(consumer_data
->metadata_sock
.lock
);
1501 lttng_poll_clean(&events
);
1503 if (cmd_socket_wrapper
) {
1504 consumer_destroy_socket(cmd_socket_wrapper
);
1509 ERR("Health error occurred in %s", __func__
);
1511 health_unregister(health_sessiond
);
1512 DBG("consumer thread cleanup completed");
1514 rcu_thread_offline();
1515 rcu_unregister_thread();
1521 * This thread receives application command sockets (FDs) on the
1522 * apps_cmd_pipe and waits (polls) on them until they are closed
1523 * or an error occurs.
1525 * At that point, it flushes the data (tracing and metadata) associated
1526 * with this application and tears down ust app sessions and other
1527 * associated data structures through ust_app_unregister().
1529 * Note that this thread never sends commands to the applications
1530 * through the command sockets; it merely listens for hang-ups
1531 * and errors on those sockets and cleans-up as they occur.
1533 static void *thread_manage_apps(void *data
)
1535 int i
, ret
, pollfd
, err
= -1;
1537 uint32_t revents
, nb_fd
;
1538 struct lttng_poll_event events
;
1540 DBG("[thread] Manage application started");
1542 rcu_register_thread();
1543 rcu_thread_online();
1545 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_MANAGE
);
1547 if (testpoint(sessiond_thread_manage_apps
)) {
1548 goto error_testpoint
;
1551 health_code_update();
1553 ret
= sessiond_set_thread_pollset(&events
, 2);
1555 goto error_poll_create
;
1558 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1563 if (testpoint(sessiond_thread_manage_apps_before_loop
)) {
1567 health_code_update();
1570 DBG("Apps thread polling");
1572 /* Inifinite blocking call, waiting for transmission */
1574 health_poll_entry();
1575 ret
= lttng_poll_wait(&events
, -1);
1576 DBG("Apps thread return from poll on %d fds",
1577 LTTNG_POLL_GETNB(&events
));
1581 * Restart interrupted system call.
1583 if (errno
== EINTR
) {
1591 for (i
= 0; i
< nb_fd
; i
++) {
1592 /* Fetch once the poll data */
1593 revents
= LTTNG_POLL_GETEV(&events
, i
);
1594 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1596 health_code_update();
1599 /* No activity for this FD (poll implementation). */
1603 /* Thread quit pipe has been closed. Killing thread. */
1604 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1610 /* Inspect the apps cmd pipe */
1611 if (pollfd
== apps_cmd_pipe
[0]) {
1612 if (revents
& LPOLLIN
) {
1616 size_ret
= lttng_read(apps_cmd_pipe
[0], &sock
, sizeof(sock
));
1617 if (size_ret
< sizeof(sock
)) {
1618 PERROR("read apps cmd pipe");
1622 health_code_update();
1625 * Since this is a command socket (write then read),
1626 * we only monitor the error events of the socket.
1628 ret
= lttng_poll_add(&events
, sock
,
1629 LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
);
1634 DBG("Apps with sock %d added to poll set", sock
);
1635 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1636 ERR("Apps command pipe error");
1639 ERR("Unknown poll events %u for sock %d", revents
, pollfd
);
1644 * At this point, we know that a registered application made
1645 * the event at poll_wait.
1647 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1648 /* Removing from the poll set */
1649 ret
= lttng_poll_del(&events
, pollfd
);
1654 /* Socket closed on remote end. */
1655 ust_app_unregister(pollfd
);
1657 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1662 health_code_update();
1668 lttng_poll_clean(&events
);
1671 utils_close_pipe(apps_cmd_pipe
);
1672 apps_cmd_pipe
[0] = apps_cmd_pipe
[1] = -1;
1675 * We don't clean the UST app hash table here since already registered
1676 * applications can still be controlled so let them be until the session
1677 * daemon dies or the applications stop.
1682 ERR("Health error occurred in %s", __func__
);
1684 health_unregister(health_sessiond
);
1685 DBG("Application communication apps thread cleanup complete");
1686 rcu_thread_offline();
1687 rcu_unregister_thread();
1692 * Send a socket to a thread This is called from the dispatch UST registration
1693 * thread once all sockets are set for the application.
1695 * The sock value can be invalid, we don't really care, the thread will handle
1696 * it and make the necessary cleanup if so.
1698 * On success, return 0 else a negative value being the errno message of the
1701 static int send_socket_to_thread(int fd
, int sock
)
1706 * It's possible that the FD is set as invalid with -1 concurrently just
1707 * before calling this function being a shutdown state of the thread.
1714 ret
= lttng_write(fd
, &sock
, sizeof(sock
));
1715 if (ret
< sizeof(sock
)) {
1716 PERROR("write apps pipe %d", fd
);
1723 /* All good. Don't send back the write positive ret value. */
1730 * Sanitize the wait queue of the dispatch registration thread meaning removing
1731 * invalid nodes from it. This is to avoid memory leaks for the case the UST
1732 * notify socket is never received.
1734 static void sanitize_wait_queue(struct ust_reg_wait_queue
*wait_queue
)
1736 int ret
, nb_fd
= 0, i
;
1737 unsigned int fd_added
= 0;
1738 struct lttng_poll_event events
;
1739 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1743 lttng_poll_init(&events
);
1745 /* Just skip everything for an empty queue. */
1746 if (!wait_queue
->count
) {
1750 ret
= lttng_poll_create(&events
, wait_queue
->count
, LTTNG_CLOEXEC
);
1755 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1756 &wait_queue
->head
, head
) {
1757 assert(wait_node
->app
);
1758 ret
= lttng_poll_add(&events
, wait_node
->app
->sock
,
1759 LPOLLHUP
| LPOLLERR
);
1772 * Poll but don't block so we can quickly identify the faulty events and
1773 * clean them afterwards from the wait queue.
1775 ret
= lttng_poll_wait(&events
, 0);
1781 for (i
= 0; i
< nb_fd
; i
++) {
1782 /* Get faulty FD. */
1783 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1784 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1787 /* No activity for this FD (poll implementation). */
1791 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1792 &wait_queue
->head
, head
) {
1793 if (pollfd
== wait_node
->app
->sock
&&
1794 (revents
& (LPOLLHUP
| LPOLLERR
))) {
1795 cds_list_del(&wait_node
->head
);
1796 wait_queue
->count
--;
1797 ust_app_destroy(wait_node
->app
);
1800 * Silence warning of use-after-free in
1801 * cds_list_for_each_entry_safe which uses
1802 * __typeof__(*wait_node).
1807 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1814 DBG("Wait queue sanitized, %d node were cleaned up", nb_fd
);
1818 lttng_poll_clean(&events
);
1822 lttng_poll_clean(&events
);
1824 ERR("Unable to sanitize wait queue");
1829 * Dispatch request from the registration threads to the application
1830 * communication thread.
1832 static void *thread_dispatch_ust_registration(void *data
)
1835 struct cds_wfcq_node
*node
;
1836 struct ust_command
*ust_cmd
= NULL
;
1837 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1838 struct ust_reg_wait_queue wait_queue
= {
1842 rcu_register_thread();
1844 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH
);
1846 if (testpoint(sessiond_thread_app_reg_dispatch
)) {
1847 goto error_testpoint
;
1850 health_code_update();
1852 CDS_INIT_LIST_HEAD(&wait_queue
.head
);
1854 DBG("[thread] Dispatch UST command started");
1857 health_code_update();
1859 /* Atomically prepare the queue futex */
1860 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1862 if (CMM_LOAD_SHARED(dispatch_thread_exit
)) {
1867 struct ust_app
*app
= NULL
;
1871 * Make sure we don't have node(s) that have hung up before receiving
1872 * the notify socket. This is to clean the list in order to avoid
1873 * memory leaks from notify socket that are never seen.
1875 sanitize_wait_queue(&wait_queue
);
1877 health_code_update();
1878 /* Dequeue command for registration */
1879 node
= cds_wfcq_dequeue_blocking(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
);
1881 DBG("Woken up but nothing in the UST command queue");
1882 /* Continue thread execution */
1886 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1888 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1889 " gid:%d sock:%d name:%s (version %d.%d)",
1890 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1891 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1892 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1893 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1895 if (ust_cmd
->reg_msg
.type
== USTCTL_SOCKET_CMD
) {
1896 wait_node
= zmalloc(sizeof(*wait_node
));
1898 PERROR("zmalloc wait_node dispatch");
1899 ret
= close(ust_cmd
->sock
);
1901 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1903 lttng_fd_put(LTTNG_FD_APPS
, 1);
1907 CDS_INIT_LIST_HEAD(&wait_node
->head
);
1909 /* Create application object if socket is CMD. */
1910 wait_node
->app
= ust_app_create(&ust_cmd
->reg_msg
,
1912 if (!wait_node
->app
) {
1913 ret
= close(ust_cmd
->sock
);
1915 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1917 lttng_fd_put(LTTNG_FD_APPS
, 1);
1923 * Add application to the wait queue so we can set the notify
1924 * socket before putting this object in the global ht.
1926 cds_list_add(&wait_node
->head
, &wait_queue
.head
);
1931 * We have to continue here since we don't have the notify
1932 * socket and the application MUST be added to the hash table
1933 * only at that moment.
1938 * Look for the application in the local wait queue and set the
1939 * notify socket if found.
1941 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1942 &wait_queue
.head
, head
) {
1943 health_code_update();
1944 if (wait_node
->app
->pid
== ust_cmd
->reg_msg
.pid
) {
1945 wait_node
->app
->notify_sock
= ust_cmd
->sock
;
1946 cds_list_del(&wait_node
->head
);
1948 app
= wait_node
->app
;
1950 DBG3("UST app notify socket %d is set", ust_cmd
->sock
);
1956 * With no application at this stage the received socket is
1957 * basically useless so close it before we free the cmd data
1958 * structure for good.
1961 ret
= close(ust_cmd
->sock
);
1963 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1965 lttng_fd_put(LTTNG_FD_APPS
, 1);
1972 * @session_lock_list
1974 * Lock the global session list so from the register up to the
1975 * registration done message, no thread can see the application
1976 * and change its state.
1978 session_lock_list();
1982 * Add application to the global hash table. This needs to be
1983 * done before the update to the UST registry can locate the
1988 /* Set app version. This call will print an error if needed. */
1989 (void) ust_app_version(app
);
1991 /* Send notify socket through the notify pipe. */
1992 ret
= send_socket_to_thread(apps_cmd_notify_pipe
[1],
1996 session_unlock_list();
1998 * No notify thread, stop the UST tracing. However, this is
1999 * not an internal error of the this thread thus setting
2000 * the health error code to a normal exit.
2007 * Update newly registered application with the tracing
2008 * registry info already enabled information.
2010 update_ust_app(app
->sock
);
2013 * Don't care about return value. Let the manage apps threads
2014 * handle app unregistration upon socket close.
2016 (void) ust_app_register_done(app
);
2019 * Even if the application socket has been closed, send the app
2020 * to the thread and unregistration will take place at that
2023 ret
= send_socket_to_thread(apps_cmd_pipe
[1], app
->sock
);
2026 session_unlock_list();
2028 * No apps. thread, stop the UST tracing. However, this is
2029 * not an internal error of the this thread thus setting
2030 * the health error code to a normal exit.
2037 session_unlock_list();
2039 } while (node
!= NULL
);
2041 health_poll_entry();
2042 /* Futex wait on queue. Blocking call on futex() */
2043 futex_nto1_wait(&ust_cmd_queue
.futex
);
2046 /* Normal exit, no error */
2050 /* Clean up wait queue. */
2051 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
2052 &wait_queue
.head
, head
) {
2053 cds_list_del(&wait_node
->head
);
2058 /* Empty command queue. */
2060 /* Dequeue command for registration */
2061 node
= cds_wfcq_dequeue_blocking(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
);
2065 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
2066 ret
= close(ust_cmd
->sock
);
2068 PERROR("close ust sock exit dispatch %d", ust_cmd
->sock
);
2070 lttng_fd_put(LTTNG_FD_APPS
, 1);
2075 DBG("Dispatch thread dying");
2078 ERR("Health error occurred in %s", __func__
);
2080 health_unregister(health_sessiond
);
2081 rcu_unregister_thread();
2086 * This thread manage application registration.
2088 static void *thread_registration_apps(void *data
)
2090 int sock
= -1, i
, ret
, pollfd
, err
= -1;
2091 uint32_t revents
, nb_fd
;
2092 struct lttng_poll_event events
;
2094 * Get allocated in this thread, enqueued to a global queue, dequeued and
2095 * freed in the manage apps thread.
2097 struct ust_command
*ust_cmd
= NULL
;
2099 DBG("[thread] Manage application registration started");
2101 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_REG
);
2103 if (testpoint(sessiond_thread_registration_apps
)) {
2104 goto error_testpoint
;
2107 ret
= lttcomm_listen_unix_sock(apps_sock
);
2113 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
2114 * more will be added to this poll set.
2116 ret
= sessiond_set_thread_pollset(&events
, 2);
2118 goto error_create_poll
;
2121 /* Add the application registration socket */
2122 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
2124 goto error_poll_add
;
2127 /* Notify all applications to register */
2128 ret
= notify_ust_apps(1);
2130 ERR("Failed to notify applications or create the wait shared memory.\n"
2131 "Execution continues but there might be problem for already\n"
2132 "running applications that wishes to register.");
2136 DBG("Accepting application registration");
2138 /* Inifinite blocking call, waiting for transmission */
2140 health_poll_entry();
2141 ret
= lttng_poll_wait(&events
, -1);
2145 * Restart interrupted system call.
2147 if (errno
== EINTR
) {
2155 for (i
= 0; i
< nb_fd
; i
++) {
2156 health_code_update();
2158 /* Fetch once the poll data */
2159 revents
= LTTNG_POLL_GETEV(&events
, i
);
2160 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2163 /* No activity for this FD (poll implementation). */
2167 /* Thread quit pipe has been closed. Killing thread. */
2168 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
2174 /* Event on the registration socket */
2175 if (pollfd
== apps_sock
) {
2176 if (revents
& LPOLLIN
) {
2177 sock
= lttcomm_accept_unix_sock(apps_sock
);
2183 * Set socket timeout for both receiving and ending.
2184 * app_socket_timeout is in seconds, whereas
2185 * lttcomm_setsockopt_rcv_timeout and
2186 * lttcomm_setsockopt_snd_timeout expect msec as
2189 if (config
.app_socket_timeout
>= 0) {
2190 (void) lttcomm_setsockopt_rcv_timeout(sock
,
2191 config
.app_socket_timeout
* 1000);
2192 (void) lttcomm_setsockopt_snd_timeout(sock
,
2193 config
.app_socket_timeout
* 1000);
2197 * Set the CLOEXEC flag. Return code is useless because
2198 * either way, the show must go on.
2200 (void) utils_set_fd_cloexec(sock
);
2202 /* Create UST registration command for enqueuing */
2203 ust_cmd
= zmalloc(sizeof(struct ust_command
));
2204 if (ust_cmd
== NULL
) {
2205 PERROR("ust command zmalloc");
2214 * Using message-based transmissions to ensure we don't
2215 * have to deal with partially received messages.
2217 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2219 ERR("Exhausted file descriptors allowed for applications.");
2229 health_code_update();
2230 ret
= ust_app_recv_registration(sock
, &ust_cmd
->reg_msg
);
2233 /* Close socket of the application. */
2238 lttng_fd_put(LTTNG_FD_APPS
, 1);
2242 health_code_update();
2244 ust_cmd
->sock
= sock
;
2247 DBG("UST registration received with pid:%d ppid:%d uid:%d"
2248 " gid:%d sock:%d name:%s (version %d.%d)",
2249 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
2250 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
2251 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
2252 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
2255 * Lock free enqueue the registration request. The red pill
2256 * has been taken! This apps will be part of the *system*.
2258 cds_wfcq_enqueue(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
, &ust_cmd
->node
);
2261 * Wake the registration queue futex. Implicit memory
2262 * barrier with the exchange in cds_wfcq_enqueue.
2264 futex_nto1_wake(&ust_cmd_queue
.futex
);
2265 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2266 ERR("Register apps socket poll error");
2269 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
2278 /* Notify that the registration thread is gone */
2281 if (apps_sock
>= 0) {
2282 ret
= close(apps_sock
);
2292 lttng_fd_put(LTTNG_FD_APPS
, 1);
2294 unlink(config
.apps_unix_sock_path
.value
);
2297 lttng_poll_clean(&events
);
2301 DBG("UST Registration thread cleanup complete");
2304 ERR("Health error occurred in %s", __func__
);
2306 health_unregister(health_sessiond
);
2312 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
2313 * exec or it will fails.
2315 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
2318 struct timespec timeout
;
2321 * Make sure we set the readiness flag to 0 because we are NOT ready.
2322 * This access to consumer_thread_is_ready does not need to be
2323 * protected by consumer_data.cond_mutex (yet) since the consumer
2324 * management thread has not been started at this point.
2326 consumer_data
->consumer_thread_is_ready
= 0;
2328 /* Setup pthread condition */
2329 ret
= pthread_condattr_init(&consumer_data
->condattr
);
2332 PERROR("pthread_condattr_init consumer data");
2337 * Set the monotonic clock in order to make sure we DO NOT jump in time
2338 * between the clock_gettime() call and the timedwait call. See bug #324
2339 * for a more details and how we noticed it.
2341 ret
= pthread_condattr_setclock(&consumer_data
->condattr
, CLOCK_MONOTONIC
);
2344 PERROR("pthread_condattr_setclock consumer data");
2348 ret
= pthread_cond_init(&consumer_data
->cond
, &consumer_data
->condattr
);
2351 PERROR("pthread_cond_init consumer data");
2355 ret
= pthread_create(&consumer_data
->thread
, default_pthread_attr(),
2356 thread_manage_consumer
, consumer_data
);
2359 PERROR("pthread_create consumer");
2364 /* We are about to wait on a pthread condition */
2365 pthread_mutex_lock(&consumer_data
->cond_mutex
);
2367 /* Get time for sem_timedwait absolute timeout */
2368 clock_ret
= lttng_clock_gettime(CLOCK_MONOTONIC
, &timeout
);
2370 * Set the timeout for the condition timed wait even if the clock gettime
2371 * call fails since we might loop on that call and we want to avoid to
2372 * increment the timeout too many times.
2374 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
2377 * The following loop COULD be skipped in some conditions so this is why we
2378 * set ret to 0 in order to make sure at least one round of the loop is
2384 * Loop until the condition is reached or when a timeout is reached. Note
2385 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
2386 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
2387 * possible. This loop does not take any chances and works with both of
2390 while (!consumer_data
->consumer_thread_is_ready
&& ret
!= ETIMEDOUT
) {
2391 if (clock_ret
< 0) {
2392 PERROR("clock_gettime spawn consumer");
2393 /* Infinite wait for the consumerd thread to be ready */
2394 ret
= pthread_cond_wait(&consumer_data
->cond
,
2395 &consumer_data
->cond_mutex
);
2397 ret
= pthread_cond_timedwait(&consumer_data
->cond
,
2398 &consumer_data
->cond_mutex
, &timeout
);
2402 /* Release the pthread condition */
2403 pthread_mutex_unlock(&consumer_data
->cond_mutex
);
2407 if (ret
== ETIMEDOUT
) {
2411 * Call has timed out so we kill the kconsumerd_thread and return
2414 ERR("Condition timed out. The consumer thread was never ready."
2416 pth_ret
= pthread_cancel(consumer_data
->thread
);
2418 PERROR("pthread_cancel consumer thread");
2421 PERROR("pthread_cond_wait failed consumer thread");
2423 /* Caller is expecting a negative value on failure. */
2428 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2429 if (consumer_data
->pid
== 0) {
2430 ERR("Consumerd did not start");
2431 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2434 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2443 * Join consumer thread
2445 static int join_consumer_thread(struct consumer_data
*consumer_data
)
2449 /* Consumer pid must be a real one. */
2450 if (consumer_data
->pid
> 0) {
2452 ret
= kill(consumer_data
->pid
, SIGTERM
);
2454 PERROR("Error killing consumer daemon");
2457 return pthread_join(consumer_data
->thread
, &status
);
2464 * Fork and exec a consumer daemon (consumerd).
2466 * Return pid if successful else -1.
2468 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
2472 const char *consumer_to_use
;
2473 const char *verbosity
;
2476 DBG("Spawning consumerd");
2483 if (config
.verbose_consumer
) {
2484 verbosity
= "--verbose";
2485 } else if (lttng_opt_quiet
) {
2486 verbosity
= "--quiet";
2491 switch (consumer_data
->type
) {
2492 case LTTNG_CONSUMER_KERNEL
:
2494 * Find out which consumerd to execute. We will first try the
2495 * 64-bit path, then the sessiond's installation directory, and
2496 * fallback on the 32-bit one,
2498 DBG3("Looking for a kernel consumer at these locations:");
2499 DBG3(" 1) %s", config
.consumerd64_bin_path
.value
? : "NULL");
2500 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, DEFAULT_CONSUMERD_FILE
);
2501 DBG3(" 3) %s", config
.consumerd32_bin_path
.value
? : "NULL");
2502 if (stat(config
.consumerd64_bin_path
.value
, &st
) == 0) {
2503 DBG3("Found location #1");
2504 consumer_to_use
= config
.consumerd64_bin_path
.value
;
2505 } else if (stat(INSTALL_BIN_PATH
"/" DEFAULT_CONSUMERD_FILE
, &st
) == 0) {
2506 DBG3("Found location #2");
2507 consumer_to_use
= INSTALL_BIN_PATH
"/" DEFAULT_CONSUMERD_FILE
;
2508 } else if (stat(config
.consumerd32_bin_path
.value
, &st
) == 0) {
2509 DBG3("Found location #3");
2510 consumer_to_use
= config
.consumerd32_bin_path
.value
;
2512 DBG("Could not find any valid consumerd executable");
2516 DBG("Using kernel consumer at: %s", consumer_to_use
);
2517 (void) execl(consumer_to_use
,
2518 "lttng-consumerd", verbosity
, "-k",
2519 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2520 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2521 "--group", config
.tracing_group_name
.value
,
2524 case LTTNG_CONSUMER64_UST
:
2526 if (config
.consumerd64_lib_dir
.value
) {
2531 tmp
= lttng_secure_getenv("LD_LIBRARY_PATH");
2535 tmplen
= strlen(config
.consumerd64_lib_dir
.value
) + 1 /* : */ + strlen(tmp
);
2536 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2541 strcat(tmpnew
, config
.consumerd64_lib_dir
.value
);
2542 if (tmp
[0] != '\0') {
2543 strcat(tmpnew
, ":");
2544 strcat(tmpnew
, tmp
);
2546 ret
= setenv("LD_LIBRARY_PATH", tmpnew
, 1);
2553 DBG("Using 64-bit UST consumer at: %s", config
.consumerd64_bin_path
.value
);
2554 (void) execl(config
.consumerd64_bin_path
.value
, "lttng-consumerd", verbosity
, "-u",
2555 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2556 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2557 "--group", config
.tracing_group_name
.value
,
2561 case LTTNG_CONSUMER32_UST
:
2563 if (config
.consumerd32_lib_dir
.value
) {
2568 tmp
= lttng_secure_getenv("LD_LIBRARY_PATH");
2572 tmplen
= strlen(config
.consumerd32_lib_dir
.value
) + 1 /* : */ + strlen(tmp
);
2573 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2578 strcat(tmpnew
, config
.consumerd32_lib_dir
.value
);
2579 if (tmp
[0] != '\0') {
2580 strcat(tmpnew
, ":");
2581 strcat(tmpnew
, tmp
);
2583 ret
= setenv("LD_LIBRARY_PATH", tmpnew
, 1);
2590 DBG("Using 32-bit UST consumer at: %s", config
.consumerd32_bin_path
.value
);
2591 (void) execl(config
.consumerd32_bin_path
.value
, "lttng-consumerd", verbosity
, "-u",
2592 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2593 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2594 "--group", config
.tracing_group_name
.value
,
2599 ERR("unknown consumer type");
2603 PERROR("Consumer execl()");
2605 /* Reaching this point, we got a failure on our execl(). */
2607 } else if (pid
> 0) {
2610 PERROR("start consumer fork");
2618 * Spawn the consumerd daemon and session daemon thread.
2620 static int start_consumerd(struct consumer_data
*consumer_data
)
2625 * Set the listen() state on the socket since there is a possible race
2626 * between the exec() of the consumer daemon and this call if place in the
2627 * consumer thread. See bug #366 for more details.
2629 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
2634 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2635 if (consumer_data
->pid
!= 0) {
2636 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2640 ret
= spawn_consumerd(consumer_data
);
2642 ERR("Spawning consumerd failed");
2643 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2647 /* Setting up the consumer_data pid */
2648 consumer_data
->pid
= ret
;
2649 DBG2("Consumer pid %d", consumer_data
->pid
);
2650 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2652 DBG2("Spawning consumer control thread");
2653 ret
= spawn_consumer_thread(consumer_data
);
2655 ERR("Fatal error spawning consumer control thread");
2663 /* Cleanup already created sockets on error. */
2664 if (consumer_data
->err_sock
>= 0) {
2667 err
= close(consumer_data
->err_sock
);
2669 PERROR("close consumer data error socket");
2676 * Setup necessary data for kernel tracer action.
2678 static int init_kernel_tracer(void)
2682 /* Modprobe lttng kernel modules */
2683 ret
= modprobe_lttng_control();
2688 /* Open debugfs lttng */
2689 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
2690 if (kernel_tracer_fd
< 0) {
2691 DBG("Failed to open %s", module_proc_lttng
);
2695 /* Validate kernel version */
2696 ret
= kernel_validate_version(kernel_tracer_fd
, &kernel_tracer_version
,
2697 &kernel_tracer_abi_version
);
2702 ret
= modprobe_lttng_data();
2707 ret
= kernel_supports_ring_buffer_snapshot_sample_positions(
2714 WARN("Kernel tracer does not support buffer monitoring. "
2715 "The monitoring timer of channels in the kernel domain "
2716 "will be set to 0 (disabled).");
2719 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
2723 modprobe_remove_lttng_control();
2724 ret
= close(kernel_tracer_fd
);
2728 kernel_tracer_fd
= -1;
2729 return LTTNG_ERR_KERN_VERSION
;
2732 ret
= close(kernel_tracer_fd
);
2738 modprobe_remove_lttng_control();
2741 WARN("No kernel tracer available");
2742 kernel_tracer_fd
= -1;
2744 return LTTNG_ERR_NEED_ROOT_SESSIOND
;
2746 return LTTNG_ERR_KERN_NA
;
2752 * Copy consumer output from the tracing session to the domain session. The
2753 * function also applies the right modification on a per domain basis for the
2754 * trace files destination directory.
2756 * Should *NOT* be called with RCU read-side lock held.
2758 static int copy_session_consumer(int domain
, struct ltt_session
*session
)
2761 const char *dir_name
;
2762 struct consumer_output
*consumer
;
2765 assert(session
->consumer
);
2768 case LTTNG_DOMAIN_KERNEL
:
2769 DBG3("Copying tracing session consumer output in kernel session");
2771 * XXX: We should audit the session creation and what this function
2772 * does "extra" in order to avoid a destroy since this function is used
2773 * in the domain session creation (kernel and ust) only. Same for UST
2776 if (session
->kernel_session
->consumer
) {
2777 consumer_output_put(session
->kernel_session
->consumer
);
2779 session
->kernel_session
->consumer
=
2780 consumer_copy_output(session
->consumer
);
2781 /* Ease our life a bit for the next part */
2782 consumer
= session
->kernel_session
->consumer
;
2783 dir_name
= DEFAULT_KERNEL_TRACE_DIR
;
2785 case LTTNG_DOMAIN_JUL
:
2786 case LTTNG_DOMAIN_LOG4J
:
2787 case LTTNG_DOMAIN_PYTHON
:
2788 case LTTNG_DOMAIN_UST
:
2789 DBG3("Copying tracing session consumer output in UST session");
2790 if (session
->ust_session
->consumer
) {
2791 consumer_output_put(session
->ust_session
->consumer
);
2793 session
->ust_session
->consumer
=
2794 consumer_copy_output(session
->consumer
);
2795 /* Ease our life a bit for the next part */
2796 consumer
= session
->ust_session
->consumer
;
2797 dir_name
= DEFAULT_UST_TRACE_DIR
;
2800 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2804 /* Append correct directory to subdir */
2805 strncat(consumer
->subdir
, dir_name
,
2806 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
2807 DBG3("Copy session consumer subdir %s", consumer
->subdir
);
2816 * Create an UST session and add it to the session ust list.
2818 * Should *NOT* be called with RCU read-side lock held.
2820 static int create_ust_session(struct ltt_session
*session
,
2821 struct lttng_domain
*domain
)
2824 struct ltt_ust_session
*lus
= NULL
;
2828 assert(session
->consumer
);
2830 switch (domain
->type
) {
2831 case LTTNG_DOMAIN_JUL
:
2832 case LTTNG_DOMAIN_LOG4J
:
2833 case LTTNG_DOMAIN_PYTHON
:
2834 case LTTNG_DOMAIN_UST
:
2837 ERR("Unknown UST domain on create session %d", domain
->type
);
2838 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2842 DBG("Creating UST session");
2844 lus
= trace_ust_create_session(session
->id
);
2846 ret
= LTTNG_ERR_UST_SESS_FAIL
;
2850 lus
->uid
= session
->uid
;
2851 lus
->gid
= session
->gid
;
2852 lus
->output_traces
= session
->output_traces
;
2853 lus
->snapshot_mode
= session
->snapshot_mode
;
2854 lus
->live_timer_interval
= session
->live_timer
;
2855 session
->ust_session
= lus
;
2856 if (session
->shm_path
[0]) {
2857 strncpy(lus
->root_shm_path
, session
->shm_path
,
2858 sizeof(lus
->root_shm_path
));
2859 lus
->root_shm_path
[sizeof(lus
->root_shm_path
) - 1] = '\0';
2860 strncpy(lus
->shm_path
, session
->shm_path
,
2861 sizeof(lus
->shm_path
));
2862 lus
->shm_path
[sizeof(lus
->shm_path
) - 1] = '\0';
2863 strncat(lus
->shm_path
, "/ust",
2864 sizeof(lus
->shm_path
) - strlen(lus
->shm_path
) - 1);
2866 /* Copy session output to the newly created UST session */
2867 ret
= copy_session_consumer(domain
->type
, session
);
2868 if (ret
!= LTTNG_OK
) {
2876 session
->ust_session
= NULL
;
2881 * Create a kernel tracer session then create the default channel.
2883 static int create_kernel_session(struct ltt_session
*session
)
2887 DBG("Creating kernel session");
2889 ret
= kernel_create_session(session
, kernel_tracer_fd
);
2891 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2895 /* Code flow safety */
2896 assert(session
->kernel_session
);
2898 /* Copy session output to the newly created Kernel session */
2899 ret
= copy_session_consumer(LTTNG_DOMAIN_KERNEL
, session
);
2900 if (ret
!= LTTNG_OK
) {
2904 session
->kernel_session
->uid
= session
->uid
;
2905 session
->kernel_session
->gid
= session
->gid
;
2906 session
->kernel_session
->output_traces
= session
->output_traces
;
2907 session
->kernel_session
->snapshot_mode
= session
->snapshot_mode
;
2912 trace_kernel_destroy_session(session
->kernel_session
);
2913 session
->kernel_session
= NULL
;
2918 * Count number of session permitted by uid/gid.
2920 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2923 struct ltt_session
*session
;
2925 DBG("Counting number of available session for UID %d GID %d",
2927 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2929 * Only list the sessions the user can control.
2931 if (!session_access_ok(session
, uid
, gid
)) {
2940 * Check if the current kernel tracer supports the session rotation feature.
2941 * Return 1 if it does, 0 otherwise.
2943 static int check_rotate_compatible(void)
2947 if (kernel_tracer_version
.major
!= 2 || kernel_tracer_version
.minor
< 11) {
2948 DBG("Kernel tracer version is not compatible with the rotation feature");
2956 * Process the command requested by the lttng client within the command
2957 * context structure. This function make sure that the return structure (llm)
2958 * is set and ready for transmission before returning.
2960 * Return any error encountered or 0 for success.
2962 * "sock" is only used for special-case var. len data.
2964 * Should *NOT* be called with RCU read-side lock held.
2966 static int process_client_msg(struct command_ctx
*cmd_ctx
, int sock
,
2970 int need_tracing_session
= 1;
2973 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2975 assert(!rcu_read_ongoing());
2979 switch (cmd_ctx
->lsm
->cmd_type
) {
2980 case LTTNG_CREATE_SESSION
:
2981 case LTTNG_CREATE_SESSION_SNAPSHOT
:
2982 case LTTNG_CREATE_SESSION_LIVE
:
2983 case LTTNG_DESTROY_SESSION
:
2984 case LTTNG_LIST_SESSIONS
:
2985 case LTTNG_LIST_DOMAINS
:
2986 case LTTNG_START_TRACE
:
2987 case LTTNG_STOP_TRACE
:
2988 case LTTNG_DATA_PENDING
:
2989 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
2990 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
2991 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
2992 case LTTNG_SNAPSHOT_RECORD
:
2993 case LTTNG_SAVE_SESSION
:
2994 case LTTNG_SET_SESSION_SHM_PATH
:
2995 case LTTNG_REGENERATE_METADATA
:
2996 case LTTNG_REGENERATE_STATEDUMP
:
2997 case LTTNG_REGISTER_TRIGGER
:
2998 case LTTNG_UNREGISTER_TRIGGER
:
2999 case LTTNG_ROTATE_SESSION
:
3000 case LTTNG_ROTATION_GET_INFO
:
3001 case LTTNG_SESSION_GET_CURRENT_OUTPUT
:
3002 case LTTNG_ROTATION_SET_SCHEDULE
:
3003 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES
:
3010 if (config
.no_kernel
&& need_domain
3011 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
3013 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
3015 ret
= LTTNG_ERR_KERN_NA
;
3020 /* Deny register consumer if we already have a spawned consumer. */
3021 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_REGISTER_CONSUMER
) {
3022 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3023 if (kconsumer_data
.pid
> 0) {
3024 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
3025 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3028 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3032 * Check for command that don't needs to allocate a returned payload. We do
3033 * this here so we don't have to make the call for no payload at each
3036 switch(cmd_ctx
->lsm
->cmd_type
) {
3037 case LTTNG_LIST_SESSIONS
:
3038 case LTTNG_LIST_TRACEPOINTS
:
3039 case LTTNG_LIST_TRACEPOINT_FIELDS
:
3040 case LTTNG_LIST_DOMAINS
:
3041 case LTTNG_LIST_CHANNELS
:
3042 case LTTNG_LIST_EVENTS
:
3043 case LTTNG_LIST_SYSCALLS
:
3044 case LTTNG_LIST_TRACKER_PIDS
:
3045 case LTTNG_DATA_PENDING
:
3046 case LTTNG_ROTATE_SESSION
:
3047 case LTTNG_ROTATION_GET_INFO
:
3048 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES
:
3051 /* Setup lttng message with no payload */
3052 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, NULL
, 0);
3054 /* This label does not try to unlock the session */
3055 goto init_setup_error
;
3059 /* Commands that DO NOT need a session. */
3060 switch (cmd_ctx
->lsm
->cmd_type
) {
3061 case LTTNG_CREATE_SESSION
:
3062 case LTTNG_CREATE_SESSION_SNAPSHOT
:
3063 case LTTNG_CREATE_SESSION_LIVE
:
3064 case LTTNG_LIST_SESSIONS
:
3065 case LTTNG_LIST_TRACEPOINTS
:
3066 case LTTNG_LIST_SYSCALLS
:
3067 case LTTNG_LIST_TRACEPOINT_FIELDS
:
3068 case LTTNG_SAVE_SESSION
:
3069 case LTTNG_REGISTER_TRIGGER
:
3070 case LTTNG_UNREGISTER_TRIGGER
:
3071 need_tracing_session
= 0;
3074 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
3076 * We keep the session list lock across _all_ commands
3077 * for now, because the per-session lock does not
3078 * handle teardown properly.
3080 session_lock_list();
3081 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
3082 if (cmd_ctx
->session
== NULL
) {
3083 ret
= LTTNG_ERR_SESS_NOT_FOUND
;
3086 /* Acquire lock for the session */
3087 session_lock(cmd_ctx
->session
);
3093 * Commands that need a valid session but should NOT create one if none
3094 * exists. Instead of creating one and destroying it when the command is
3095 * handled, process that right before so we save some round trip in useless
3098 switch (cmd_ctx
->lsm
->cmd_type
) {
3099 case LTTNG_DISABLE_CHANNEL
:
3100 case LTTNG_DISABLE_EVENT
:
3101 switch (cmd_ctx
->lsm
->domain
.type
) {
3102 case LTTNG_DOMAIN_KERNEL
:
3103 if (!cmd_ctx
->session
->kernel_session
) {
3104 ret
= LTTNG_ERR_NO_CHANNEL
;
3108 case LTTNG_DOMAIN_JUL
:
3109 case LTTNG_DOMAIN_LOG4J
:
3110 case LTTNG_DOMAIN_PYTHON
:
3111 case LTTNG_DOMAIN_UST
:
3112 if (!cmd_ctx
->session
->ust_session
) {
3113 ret
= LTTNG_ERR_NO_CHANNEL
;
3118 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
3130 * Check domain type for specific "pre-action".
3132 switch (cmd_ctx
->lsm
->domain
.type
) {
3133 case LTTNG_DOMAIN_KERNEL
:
3135 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
3139 /* Kernel tracer check */
3140 if (kernel_tracer_fd
== -1) {
3141 /* Basically, load kernel tracer modules */
3142 ret
= init_kernel_tracer();
3148 /* Consumer is in an ERROR state. Report back to client */
3149 if (uatomic_read(&kernel_consumerd_state
) == CONSUMER_ERROR
) {
3150 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
3154 /* Need a session for kernel command */
3155 if (need_tracing_session
) {
3156 if (cmd_ctx
->session
->kernel_session
== NULL
) {
3157 ret
= create_kernel_session(cmd_ctx
->session
);
3159 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
3164 /* Start the kernel consumer daemon */
3165 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3166 if (kconsumer_data
.pid
== 0 &&
3167 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3168 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3169 ret
= start_consumerd(&kconsumer_data
);
3171 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
3174 uatomic_set(&kernel_consumerd_state
, CONSUMER_STARTED
);
3176 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3180 * The consumer was just spawned so we need to add the socket to
3181 * the consumer output of the session if exist.
3183 ret
= consumer_create_socket(&kconsumer_data
,
3184 cmd_ctx
->session
->kernel_session
->consumer
);
3191 case LTTNG_DOMAIN_JUL
:
3192 case LTTNG_DOMAIN_LOG4J
:
3193 case LTTNG_DOMAIN_PYTHON
:
3194 case LTTNG_DOMAIN_UST
:
3196 if (!ust_app_supported()) {
3197 ret
= LTTNG_ERR_NO_UST
;
3200 /* Consumer is in an ERROR state. Report back to client */
3201 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
3202 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
3206 if (need_tracing_session
) {
3207 /* Create UST session if none exist. */
3208 if (cmd_ctx
->session
->ust_session
== NULL
) {
3209 ret
= create_ust_session(cmd_ctx
->session
,
3210 &cmd_ctx
->lsm
->domain
);
3211 if (ret
!= LTTNG_OK
) {
3216 /* Start the UST consumer daemons */
3218 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
3219 if (config
.consumerd64_bin_path
.value
&&
3220 ustconsumer64_data
.pid
== 0 &&
3221 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3222 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3223 ret
= start_consumerd(&ustconsumer64_data
);
3225 ret
= LTTNG_ERR_UST_CONSUMER64_FAIL
;
3226 uatomic_set(&ust_consumerd64_fd
, -EINVAL
);
3230 uatomic_set(&ust_consumerd64_fd
, ustconsumer64_data
.cmd_sock
);
3231 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
3233 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3237 * Setup socket for consumer 64 bit. No need for atomic access
3238 * since it was set above and can ONLY be set in this thread.
3240 ret
= consumer_create_socket(&ustconsumer64_data
,
3241 cmd_ctx
->session
->ust_session
->consumer
);
3247 pthread_mutex_lock(&ustconsumer32_data
.pid_mutex
);
3248 if (config
.consumerd32_bin_path
.value
&&
3249 ustconsumer32_data
.pid
== 0 &&
3250 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3251 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3252 ret
= start_consumerd(&ustconsumer32_data
);
3254 ret
= LTTNG_ERR_UST_CONSUMER32_FAIL
;
3255 uatomic_set(&ust_consumerd32_fd
, -EINVAL
);
3259 uatomic_set(&ust_consumerd32_fd
, ustconsumer32_data
.cmd_sock
);
3260 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
3262 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3266 * Setup socket for consumer 64 bit. No need for atomic access
3267 * since it was set above and can ONLY be set in this thread.
3269 ret
= consumer_create_socket(&ustconsumer32_data
,
3270 cmd_ctx
->session
->ust_session
->consumer
);
3282 /* Validate consumer daemon state when start/stop trace command */
3283 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_START_TRACE
||
3284 cmd_ctx
->lsm
->cmd_type
== LTTNG_STOP_TRACE
) {
3285 switch (cmd_ctx
->lsm
->domain
.type
) {
3286 case LTTNG_DOMAIN_NONE
:
3288 case LTTNG_DOMAIN_JUL
:
3289 case LTTNG_DOMAIN_LOG4J
:
3290 case LTTNG_DOMAIN_PYTHON
:
3291 case LTTNG_DOMAIN_UST
:
3292 if (uatomic_read(&ust_consumerd_state
) != CONSUMER_STARTED
) {
3293 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
3297 case LTTNG_DOMAIN_KERNEL
:
3298 if (uatomic_read(&kernel_consumerd_state
) != CONSUMER_STARTED
) {
3299 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
3304 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
3310 * Check that the UID or GID match that of the tracing session.
3311 * The root user can interact with all sessions.
3313 if (need_tracing_session
) {
3314 if (!session_access_ok(cmd_ctx
->session
,
3315 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3316 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
3317 ret
= LTTNG_ERR_EPERM
;
3323 * Send relayd information to consumer as soon as we have a domain and a
3326 if (cmd_ctx
->session
&& need_domain
) {
3328 * Setup relayd if not done yet. If the relayd information was already
3329 * sent to the consumer, this call will gracefully return.
3331 ret
= cmd_setup_relayd(cmd_ctx
->session
);
3332 if (ret
!= LTTNG_OK
) {
3337 /* Process by command type */
3338 switch (cmd_ctx
->lsm
->cmd_type
) {
3339 case LTTNG_ADD_CONTEXT
:
3342 * An LTTNG_ADD_CONTEXT command might have a supplementary
3343 * payload if the context being added is an application context.
3345 if (cmd_ctx
->lsm
->u
.context
.ctx
.ctx
==
3346 LTTNG_EVENT_CONTEXT_APP_CONTEXT
) {
3347 char *provider_name
= NULL
, *context_name
= NULL
;
3348 size_t provider_name_len
=
3349 cmd_ctx
->lsm
->u
.context
.provider_name_len
;
3350 size_t context_name_len
=
3351 cmd_ctx
->lsm
->u
.context
.context_name_len
;
3353 if (provider_name_len
== 0 || context_name_len
== 0) {
3355 * Application provider and context names MUST
3358 ret
= -LTTNG_ERR_INVALID
;
3362 provider_name
= zmalloc(provider_name_len
+ 1);
3363 if (!provider_name
) {
3364 ret
= -LTTNG_ERR_NOMEM
;
3367 cmd_ctx
->lsm
->u
.context
.ctx
.u
.app_ctx
.provider_name
=
3370 context_name
= zmalloc(context_name_len
+ 1);
3371 if (!context_name
) {
3372 ret
= -LTTNG_ERR_NOMEM
;
3373 goto error_add_context
;
3375 cmd_ctx
->lsm
->u
.context
.ctx
.u
.app_ctx
.ctx_name
=
3378 ret
= lttcomm_recv_unix_sock(sock
, provider_name
,
3381 goto error_add_context
;
3384 ret
= lttcomm_recv_unix_sock(sock
, context_name
,
3387 goto error_add_context
;
3392 * cmd_add_context assumes ownership of the provider and context
3395 ret
= cmd_add_context(cmd_ctx
->session
,
3396 cmd_ctx
->lsm
->domain
.type
,
3397 cmd_ctx
->lsm
->u
.context
.channel_name
,
3398 &cmd_ctx
->lsm
->u
.context
.ctx
,
3399 kernel_poll_pipe
[1]);
3401 cmd_ctx
->lsm
->u
.context
.ctx
.u
.app_ctx
.provider_name
= NULL
;
3402 cmd_ctx
->lsm
->u
.context
.ctx
.u
.app_ctx
.ctx_name
= NULL
;
3404 free(cmd_ctx
->lsm
->u
.context
.ctx
.u
.app_ctx
.provider_name
);
3405 free(cmd_ctx
->lsm
->u
.context
.ctx
.u
.app_ctx
.ctx_name
);
3411 case LTTNG_DISABLE_CHANNEL
:
3413 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3414 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3417 case LTTNG_DISABLE_EVENT
:
3421 * FIXME: handle filter; for now we just receive the filter's
3422 * bytecode along with the filter expression which are sent by
3423 * liblttng-ctl and discard them.
3425 * This fixes an issue where the client may block while sending
3426 * the filter payload and encounter an error because the session
3427 * daemon closes the socket without ever handling this data.
3429 size_t count
= cmd_ctx
->lsm
->u
.disable
.expression_len
+
3430 cmd_ctx
->lsm
->u
.disable
.bytecode_len
;
3433 char data
[LTTNG_FILTER_MAX_LEN
];
3435 DBG("Discarding disable event command payload of size %zu", count
);
3437 ret
= lttcomm_recv_unix_sock(sock
, data
,
3438 count
> sizeof(data
) ? sizeof(data
) : count
);
3443 count
-= (size_t) ret
;
3446 /* FIXME: passing packed structure to non-packed pointer */
3447 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3448 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3449 &cmd_ctx
->lsm
->u
.disable
.event
);
3452 case LTTNG_ENABLE_CHANNEL
:
3454 cmd_ctx
->lsm
->u
.channel
.chan
.attr
.extended
.ptr
=
3455 (struct lttng_channel_extended
*) &cmd_ctx
->lsm
->u
.channel
.extended
;
3456 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3457 &cmd_ctx
->lsm
->u
.channel
.chan
,
3458 kernel_poll_pipe
[1]);
3461 case LTTNG_TRACK_PID
:
3463 ret
= cmd_track_pid(cmd_ctx
->session
,
3464 cmd_ctx
->lsm
->domain
.type
,
3465 cmd_ctx
->lsm
->u
.pid_tracker
.pid
);
3468 case LTTNG_UNTRACK_PID
:
3470 ret
= cmd_untrack_pid(cmd_ctx
->session
,
3471 cmd_ctx
->lsm
->domain
.type
,
3472 cmd_ctx
->lsm
->u
.pid_tracker
.pid
);
3475 case LTTNG_ENABLE_EVENT
:
3477 struct lttng_event_exclusion
*exclusion
= NULL
;
3478 struct lttng_filter_bytecode
*bytecode
= NULL
;
3479 char *filter_expression
= NULL
;
3481 /* Handle exclusion events and receive it from the client. */
3482 if (cmd_ctx
->lsm
->u
.enable
.exclusion_count
> 0) {
3483 size_t count
= cmd_ctx
->lsm
->u
.enable
.exclusion_count
;
3485 exclusion
= zmalloc(sizeof(struct lttng_event_exclusion
) +
3486 (count
* LTTNG_SYMBOL_NAME_LEN
));
3488 ret
= LTTNG_ERR_EXCLUSION_NOMEM
;
3492 DBG("Receiving var len exclusion event list from client ...");
3493 exclusion
->count
= count
;
3494 ret
= lttcomm_recv_unix_sock(sock
, exclusion
->names
,
3495 count
* LTTNG_SYMBOL_NAME_LEN
);
3497 DBG("Nothing recv() from client var len data... continuing");
3500 ret
= LTTNG_ERR_EXCLUSION_INVAL
;
3505 /* Get filter expression from client. */
3506 if (cmd_ctx
->lsm
->u
.enable
.expression_len
> 0) {
3507 size_t expression_len
=
3508 cmd_ctx
->lsm
->u
.enable
.expression_len
;
3510 if (expression_len
> LTTNG_FILTER_MAX_LEN
) {
3511 ret
= LTTNG_ERR_FILTER_INVAL
;
3516 filter_expression
= zmalloc(expression_len
);
3517 if (!filter_expression
) {
3519 ret
= LTTNG_ERR_FILTER_NOMEM
;
3523 /* Receive var. len. data */
3524 DBG("Receiving var len filter's expression from client ...");
3525 ret
= lttcomm_recv_unix_sock(sock
, filter_expression
,
3528 DBG("Nothing recv() from client car len data... continuing");
3530 free(filter_expression
);
3532 ret
= LTTNG_ERR_FILTER_INVAL
;
3537 /* Handle filter and get bytecode from client. */
3538 if (cmd_ctx
->lsm
->u
.enable
.bytecode_len
> 0) {
3539 size_t bytecode_len
= cmd_ctx
->lsm
->u
.enable
.bytecode_len
;
3541 if (bytecode_len
> LTTNG_FILTER_MAX_LEN
) {
3542 ret
= LTTNG_ERR_FILTER_INVAL
;
3543 free(filter_expression
);
3548 bytecode
= zmalloc(bytecode_len
);
3550 free(filter_expression
);
3552 ret
= LTTNG_ERR_FILTER_NOMEM
;
3556 /* Receive var. len. data */
3557 DBG("Receiving var len filter's bytecode from client ...");
3558 ret
= lttcomm_recv_unix_sock(sock
, bytecode
, bytecode_len
);
3560 DBG("Nothing recv() from client car len data... continuing");
3562 free(filter_expression
);
3565 ret
= LTTNG_ERR_FILTER_INVAL
;
3569 if ((bytecode
->len
+ sizeof(*bytecode
)) != bytecode_len
) {
3570 free(filter_expression
);
3573 ret
= LTTNG_ERR_FILTER_INVAL
;
3578 ret
= cmd_enable_event(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3579 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3580 &cmd_ctx
->lsm
->u
.enable
.event
,
3581 filter_expression
, bytecode
, exclusion
,
3582 kernel_poll_pipe
[1]);
3585 case LTTNG_LIST_TRACEPOINTS
:
3587 struct lttng_event
*events
;
3590 session_lock_list();
3591 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3592 session_unlock_list();
3593 if (nb_events
< 0) {
3594 /* Return value is a negative lttng_error_code. */
3600 * Setup lttng message with payload size set to the event list size in
3601 * bytes and then copy list into the llm payload.
3603 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, events
,
3604 sizeof(struct lttng_event
) * nb_events
);
3614 case LTTNG_LIST_TRACEPOINT_FIELDS
:
3616 struct lttng_event_field
*fields
;
3619 session_lock_list();
3620 nb_fields
= cmd_list_tracepoint_fields(cmd_ctx
->lsm
->domain
.type
,
3622 session_unlock_list();
3623 if (nb_fields
< 0) {
3624 /* Return value is a negative lttng_error_code. */
3630 * Setup lttng message with payload size set to the event list size in
3631 * bytes and then copy list into the llm payload.
3633 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, fields
,
3634 sizeof(struct lttng_event_field
) * nb_fields
);
3644 case LTTNG_LIST_SYSCALLS
:
3646 struct lttng_event
*events
;
3649 nb_events
= cmd_list_syscalls(&events
);
3650 if (nb_events
< 0) {
3651 /* Return value is a negative lttng_error_code. */
3657 * Setup lttng message with payload size set to the event list size in
3658 * bytes and then copy list into the llm payload.
3660 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, events
,
3661 sizeof(struct lttng_event
) * nb_events
);
3671 case LTTNG_LIST_TRACKER_PIDS
:
3673 int32_t *pids
= NULL
;
3676 nr_pids
= cmd_list_tracker_pids(cmd_ctx
->session
,
3677 cmd_ctx
->lsm
->domain
.type
, &pids
);
3679 /* Return value is a negative lttng_error_code. */
3685 * Setup lttng message with payload size set to the event list size in
3686 * bytes and then copy list into the llm payload.
3688 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, pids
,
3689 sizeof(int32_t) * nr_pids
);
3699 case LTTNG_SET_CONSUMER_URI
:
3702 struct lttng_uri
*uris
;
3704 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3705 len
= nb_uri
* sizeof(struct lttng_uri
);
3708 ret
= LTTNG_ERR_INVALID
;
3712 uris
= zmalloc(len
);
3714 ret
= LTTNG_ERR_FATAL
;
3718 /* Receive variable len data */
3719 DBG("Receiving %zu URI(s) from client ...", nb_uri
);
3720 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3722 DBG("No URIs received from client... continuing");
3724 ret
= LTTNG_ERR_SESSION_FAIL
;
3729 ret
= cmd_set_consumer_uri(cmd_ctx
->session
, nb_uri
, uris
);
3731 if (ret
!= LTTNG_OK
) {
3738 case LTTNG_START_TRACE
:
3741 * On the first start, if we have a kernel session and we have
3742 * enabled time or size-based rotations, we have to make sure
3743 * the kernel tracer supports it.
3745 if (!cmd_ctx
->session
->has_been_started
&& \
3746 cmd_ctx
->session
->kernel_session
&& \
3747 (cmd_ctx
->session
->rotate_timer_period
|| \
3748 cmd_ctx
->session
->rotate_size
) && \
3749 !check_rotate_compatible()) {
3750 DBG("Kernel tracer version is not compatible with the rotation feature");
3751 ret
= LTTNG_ERR_ROTATION_WRONG_VERSION
;
3754 ret
= cmd_start_trace(cmd_ctx
->session
);
3757 case LTTNG_STOP_TRACE
:
3759 ret
= cmd_stop_trace(cmd_ctx
->session
);
3762 case LTTNG_CREATE_SESSION
:
3765 struct lttng_uri
*uris
= NULL
;
3767 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3768 len
= nb_uri
* sizeof(struct lttng_uri
);
3771 uris
= zmalloc(len
);
3773 ret
= LTTNG_ERR_FATAL
;
3777 /* Receive variable len data */
3778 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3779 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3781 DBG("No URIs received from client... continuing");
3783 ret
= LTTNG_ERR_SESSION_FAIL
;
3788 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3789 DBG("Creating session with ONE network URI is a bad call");
3790 ret
= LTTNG_ERR_SESSION_FAIL
;
3796 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
, nb_uri
,
3797 &cmd_ctx
->creds
, 0);
3803 case LTTNG_DESTROY_SESSION
:
3805 ret
= cmd_destroy_session(cmd_ctx
->session
, kernel_poll_pipe
[1],
3806 notification_thread_handle
);
3808 /* Set session to NULL so we do not unlock it after free. */
3809 cmd_ctx
->session
= NULL
;
3812 case LTTNG_LIST_DOMAINS
:
3815 struct lttng_domain
*domains
= NULL
;
3817 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3819 /* Return value is a negative lttng_error_code. */
3824 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, domains
,
3825 nb_dom
* sizeof(struct lttng_domain
));
3835 case LTTNG_LIST_CHANNELS
:
3837 ssize_t payload_size
;
3838 struct lttng_channel
*channels
= NULL
;
3840 payload_size
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3841 cmd_ctx
->session
, &channels
);
3842 if (payload_size
< 0) {
3843 /* Return value is a negative lttng_error_code. */
3844 ret
= -payload_size
;
3848 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, channels
,
3859 case LTTNG_LIST_EVENTS
:
3862 struct lttng_event
*events
= NULL
;
3863 struct lttcomm_event_command_header cmd_header
;
3866 memset(&cmd_header
, 0, sizeof(cmd_header
));
3867 /* Extended infos are included at the end of events */
3868 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
,
3869 cmd_ctx
->session
, cmd_ctx
->lsm
->u
.list
.channel_name
,
3870 &events
, &total_size
);
3873 /* Return value is a negative lttng_error_code. */
3878 cmd_header
.nb_events
= nb_event
;
3879 ret
= setup_lttng_msg(cmd_ctx
, events
, total_size
,
3880 &cmd_header
, sizeof(cmd_header
));
3890 case LTTNG_LIST_SESSIONS
:
3892 unsigned int nr_sessions
;
3893 void *sessions_payload
;
3896 session_lock_list();
3897 nr_sessions
= lttng_sessions_count(
3898 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3899 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3900 payload_len
= sizeof(struct lttng_session
) * nr_sessions
;
3901 sessions_payload
= zmalloc(payload_len
);
3903 if (!sessions_payload
) {
3904 session_unlock_list();
3909 cmd_list_lttng_sessions(sessions_payload
,
3910 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3911 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3912 session_unlock_list();
3914 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, sessions_payload
,
3916 free(sessions_payload
);
3925 case LTTNG_REGISTER_CONSUMER
:
3927 struct consumer_data
*cdata
;
3929 switch (cmd_ctx
->lsm
->domain
.type
) {
3930 case LTTNG_DOMAIN_KERNEL
:
3931 cdata
= &kconsumer_data
;
3934 ret
= LTTNG_ERR_UND
;
3938 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3939 cmd_ctx
->lsm
->u
.reg
.path
, cdata
);
3942 case LTTNG_DATA_PENDING
:
3945 uint8_t pending_ret_byte
;
3947 pending_ret
= cmd_data_pending(cmd_ctx
->session
);
3952 * This function may returns 0 or 1 to indicate whether or not
3953 * there is data pending. In case of error, it should return an
3954 * LTTNG_ERR code. However, some code paths may still return
3955 * a nondescript error code, which we handle by returning an
3958 if (pending_ret
== 0 || pending_ret
== 1) {
3960 * ret will be set to LTTNG_OK at the end of
3963 } else if (pending_ret
< 0) {
3964 ret
= LTTNG_ERR_UNK
;
3971 pending_ret_byte
= (uint8_t) pending_ret
;
3973 /* 1 byte to return whether or not data is pending */
3974 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
,
3975 &pending_ret_byte
, 1);
3984 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
3986 struct lttcomm_lttng_output_id reply
;
3988 ret
= cmd_snapshot_add_output(cmd_ctx
->session
,
3989 &cmd_ctx
->lsm
->u
.snapshot_output
.output
, &reply
.id
);
3990 if (ret
!= LTTNG_OK
) {
3994 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &reply
,
4000 /* Copy output list into message payload */
4004 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
4006 ret
= cmd_snapshot_del_output(cmd_ctx
->session
,
4007 &cmd_ctx
->lsm
->u
.snapshot_output
.output
);
4010 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
4013 struct lttng_snapshot_output
*outputs
= NULL
;
4015 nb_output
= cmd_snapshot_list_outputs(cmd_ctx
->session
, &outputs
);
4016 if (nb_output
< 0) {
4021 assert((nb_output
> 0 && outputs
) || nb_output
== 0);
4022 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, outputs
,
4023 nb_output
* sizeof(struct lttng_snapshot_output
));
4033 case LTTNG_SNAPSHOT_RECORD
:
4035 ret
= cmd_snapshot_record(cmd_ctx
->session
,
4036 &cmd_ctx
->lsm
->u
.snapshot_record
.output
,
4037 cmd_ctx
->lsm
->u
.snapshot_record
.wait
);
4040 case LTTNG_CREATE_SESSION_SNAPSHOT
:
4043 struct lttng_uri
*uris
= NULL
;
4045 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
4046 len
= nb_uri
* sizeof(struct lttng_uri
);
4049 uris
= zmalloc(len
);
4051 ret
= LTTNG_ERR_FATAL
;
4055 /* Receive variable len data */
4056 DBG("Waiting for %zu URIs from client ...", nb_uri
);
4057 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
4059 DBG("No URIs received from client... continuing");
4061 ret
= LTTNG_ERR_SESSION_FAIL
;
4066 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
4067 DBG("Creating session with ONE network URI is a bad call");
4068 ret
= LTTNG_ERR_SESSION_FAIL
;
4074 ret
= cmd_create_session_snapshot(cmd_ctx
->lsm
->session
.name
, uris
,
4075 nb_uri
, &cmd_ctx
->creds
);
4079 case LTTNG_CREATE_SESSION_LIVE
:
4082 struct lttng_uri
*uris
= NULL
;
4084 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
4085 len
= nb_uri
* sizeof(struct lttng_uri
);
4088 uris
= zmalloc(len
);
4090 ret
= LTTNG_ERR_FATAL
;
4094 /* Receive variable len data */
4095 DBG("Waiting for %zu URIs from client ...", nb_uri
);
4096 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
4098 DBG("No URIs received from client... continuing");
4100 ret
= LTTNG_ERR_SESSION_FAIL
;
4105 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
4106 DBG("Creating session with ONE network URI is a bad call");
4107 ret
= LTTNG_ERR_SESSION_FAIL
;
4113 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
,
4114 nb_uri
, &cmd_ctx
->creds
, cmd_ctx
->lsm
->u
.session_live
.timer_interval
);
4118 case LTTNG_SAVE_SESSION
:
4120 ret
= cmd_save_sessions(&cmd_ctx
->lsm
->u
.save_session
.attr
,
4124 case LTTNG_SET_SESSION_SHM_PATH
:
4126 ret
= cmd_set_session_shm_path(cmd_ctx
->session
,
4127 cmd_ctx
->lsm
->u
.set_shm_path
.shm_path
);
4130 case LTTNG_REGENERATE_METADATA
:
4132 ret
= cmd_regenerate_metadata(cmd_ctx
->session
);
4135 case LTTNG_REGENERATE_STATEDUMP
:
4137 ret
= cmd_regenerate_statedump(cmd_ctx
->session
);
4140 case LTTNG_REGISTER_TRIGGER
:
4142 ret
= cmd_register_trigger(cmd_ctx
, sock
,
4143 notification_thread_handle
);
4146 case LTTNG_UNREGISTER_TRIGGER
:
4148 ret
= cmd_unregister_trigger(cmd_ctx
, sock
,
4149 notification_thread_handle
);
4152 case LTTNG_ROTATE_SESSION
:
4154 struct lttng_rotate_session_return rotate_return
;
4156 DBG("Client rotate session \"%s\"", cmd_ctx
->session
->name
);
4158 memset(&rotate_return
, 0, sizeof(rotate_return
));
4159 if (cmd_ctx
->session
->kernel_session
&& !check_rotate_compatible()) {
4160 DBG("Kernel tracer version is not compatible with the rotation feature");
4161 ret
= LTTNG_ERR_ROTATION_WRONG_VERSION
;
4165 ret
= cmd_rotate_session(cmd_ctx
->session
, &rotate_return
);
4171 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &rotate_return
,
4172 sizeof(rotate_return
));
4181 case LTTNG_ROTATION_GET_INFO
:
4183 struct lttng_rotation_get_info_return get_info_return
;
4185 memset(&get_info_return
, 0, sizeof(get_info_return
));
4186 ret
= cmd_rotate_get_info(cmd_ctx
->session
, &get_info_return
,
4187 cmd_ctx
->lsm
->u
.get_rotation_info
.rotation_id
);
4193 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &get_info_return
,
4194 sizeof(get_info_return
));
4203 case LTTNG_SESSION_GET_CURRENT_OUTPUT
:
4205 struct lttng_session_get_current_output_return output_return
;
4207 memset(&output_return
, 0, sizeof(output_return
));
4208 ret
= cmd_session_get_current_output(cmd_ctx
->session
,
4215 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &output_return
,
4216 sizeof(output_return
));
4225 case LTTNG_ROTATION_SET_SCHEDULE
:
4228 enum lttng_rotation_schedule_type schedule_type
;
4231 if (cmd_ctx
->session
->kernel_session
&& !check_rotate_compatible()) {
4232 DBG("Kernel tracer version does not support session rotations");
4233 ret
= LTTNG_ERR_ROTATION_WRONG_VERSION
;
4237 set_schedule
= cmd_ctx
->lsm
->u
.rotation_set_schedule
.set
== 1;
4238 schedule_type
= (enum lttng_rotation_schedule_type
) cmd_ctx
->lsm
->u
.rotation_set_schedule
.type
;
4239 value
= cmd_ctx
->lsm
->u
.rotation_set_schedule
.value
;
4241 ret
= cmd_rotation_set_schedule(cmd_ctx
->session
,
4245 notification_thread_handle
);
4246 if (ret
!= LTTNG_OK
) {
4252 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES
:
4254 struct lttng_session_list_schedules_return schedules
= {
4255 .periodic
.set
= !!cmd_ctx
->session
->rotate_timer_period
,
4256 .periodic
.value
= cmd_ctx
->session
->rotate_timer_period
,
4257 .size
.set
= !!cmd_ctx
->session
->rotate_size
,
4258 .size
.value
= cmd_ctx
->session
->rotate_size
,
4261 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &schedules
,
4272 ret
= LTTNG_ERR_UND
;
4277 if (cmd_ctx
->llm
== NULL
) {
4278 DBG("Missing llm structure. Allocating one.");
4279 if (setup_lttng_msg_no_cmd_header(cmd_ctx
, NULL
, 0) < 0) {
4283 /* Set return code */
4284 cmd_ctx
->llm
->ret_code
= ret
;
4286 if (cmd_ctx
->session
) {
4287 session_unlock(cmd_ctx
->session
);
4289 if (need_tracing_session
) {
4290 session_unlock_list();
4293 assert(!rcu_read_ongoing());
4298 * Thread managing health check socket.
4300 static void *thread_manage_health(void *data
)
4302 int sock
= -1, new_sock
= -1, ret
, i
, pollfd
, err
= -1;
4303 uint32_t revents
, nb_fd
;
4304 struct lttng_poll_event events
;
4305 struct health_comm_msg msg
;
4306 struct health_comm_reply reply
;
4308 DBG("[thread] Manage health check started");
4310 rcu_register_thread();
4312 /* We might hit an error path before this is created. */
4313 lttng_poll_init(&events
);
4315 /* Create unix socket */
4316 sock
= lttcomm_create_unix_sock(config
.health_unix_sock_path
.value
);
4318 ERR("Unable to create health check Unix socket");
4323 /* lttng health client socket path permissions */
4324 ret
= chown(config
.health_unix_sock_path
.value
, 0,
4325 utils_get_group_id(config
.tracing_group_name
.value
));
4327 ERR("Unable to set group on %s", config
.health_unix_sock_path
.value
);
4332 ret
= chmod(config
.health_unix_sock_path
.value
,
4333 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4335 ERR("Unable to set permissions on %s", config
.health_unix_sock_path
.value
);
4342 * Set the CLOEXEC flag. Return code is useless because either way, the
4345 (void) utils_set_fd_cloexec(sock
);
4347 ret
= lttcomm_listen_unix_sock(sock
);
4353 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
4354 * more will be added to this poll set.
4356 ret
= sessiond_set_thread_pollset(&events
, 2);
4361 /* Add the application registration socket */
4362 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLPRI
);
4367 sessiond_notify_ready();
4370 DBG("Health check ready");
4372 /* Inifinite blocking call, waiting for transmission */
4374 ret
= lttng_poll_wait(&events
, -1);
4377 * Restart interrupted system call.
4379 if (errno
== EINTR
) {
4387 for (i
= 0; i
< nb_fd
; i
++) {
4388 /* Fetch once the poll data */
4389 revents
= LTTNG_POLL_GETEV(&events
, i
);
4390 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
4393 /* No activity for this FD (poll implementation). */
4397 /* Thread quit pipe has been closed. Killing thread. */
4398 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
4404 /* Event on the registration socket */
4405 if (pollfd
== sock
) {
4406 if (revents
& LPOLLIN
) {
4408 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
4409 ERR("Health socket poll error");
4412 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
4418 new_sock
= lttcomm_accept_unix_sock(sock
);
4424 * Set the CLOEXEC flag. Return code is useless because either way, the
4427 (void) utils_set_fd_cloexec(new_sock
);
4429 DBG("Receiving data from client for health...");
4430 ret
= lttcomm_recv_unix_sock(new_sock
, (void *)&msg
, sizeof(msg
));
4432 DBG("Nothing recv() from client... continuing");
4433 ret
= close(new_sock
);
4440 rcu_thread_online();
4442 memset(&reply
, 0, sizeof(reply
));
4443 for (i
= 0; i
< NR_HEALTH_SESSIOND_TYPES
; i
++) {
4445 * health_check_state returns 0 if health is
4448 if (!health_check_state(health_sessiond
, i
)) {
4449 reply
.ret_code
|= 1ULL << i
;
4453 DBG2("Health check return value %" PRIx64
, reply
.ret_code
);
4455 ret
= send_unix_sock(new_sock
, (void *) &reply
, sizeof(reply
));
4457 ERR("Failed to send health data back to client");
4460 /* End of transmission */
4461 ret
= close(new_sock
);
4470 ERR("Health error occurred in %s", __func__
);
4472 DBG("Health check thread dying");
4473 unlink(config
.health_unix_sock_path
.value
);
4481 lttng_poll_clean(&events
);
4483 rcu_unregister_thread();
4488 * This thread manage all clients request using the unix client socket for
4491 static void *thread_manage_clients(void *data
)
4493 int sock
= -1, ret
, i
, pollfd
, err
= -1;
4495 uint32_t revents
, nb_fd
;
4496 struct command_ctx
*cmd_ctx
= NULL
;
4497 struct lttng_poll_event events
;
4499 DBG("[thread] Manage client started");
4501 rcu_register_thread();
4503 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_CMD
);
4505 health_code_update();
4507 ret
= lttcomm_listen_unix_sock(client_sock
);
4513 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
4514 * more will be added to this poll set.
4516 ret
= sessiond_set_thread_pollset(&events
, 2);
4518 goto error_create_poll
;
4521 /* Add the application registration socket */
4522 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
4527 ret
= sem_post(&load_info
->message_thread_ready
);
4529 PERROR("sem_post message_thread_ready");
4534 * Wait until all support threads are initialized before accepting
4537 while (uatomic_read(<tng_sessiond_ready
) != 0) {
4539 struct timeval timeout
;
4542 FD_SET(thread_quit_pipe
[0], &read_fds
);
4543 memset(&timeout
, 0, sizeof(timeout
));
4544 timeout
.tv_usec
= 1000;
4547 * If a support thread failed to launch, it may signal that
4548 * we must exit and the sessiond would never be marked as
4551 * The timeout is set to 1ms, which serves as a way to
4552 * pace down this check.
4554 ret
= select(thread_quit_pipe
[0] + 1, &read_fds
, NULL
, NULL
,
4556 if (ret
> 0 || (ret
< 0 && errno
!= EINTR
)) {
4561 * This barrier is paired with the one in sessiond_notify_ready() to
4562 * ensure that loads accessing data initialized by the other threads,
4563 * on which this thread was waiting, are not performed before this point.
4565 * Note that this could be a 'read' memory barrier, but a full barrier
4566 * is used in case the code changes. The performance implications of
4567 * this choice are minimal since this is a slow path.
4571 /* This testpoint is after we signal readiness to the parent. */
4572 if (testpoint(sessiond_thread_manage_clients
)) {
4576 if (testpoint(sessiond_thread_manage_clients_before_loop
)) {
4580 health_code_update();
4583 const struct cmd_completion_handler
*cmd_completion_handler
;
4585 DBG("Accepting client command ...");
4587 /* Inifinite blocking call, waiting for transmission */
4589 health_poll_entry();
4590 ret
= lttng_poll_wait(&events
, -1);
4594 * Restart interrupted system call.
4596 if (errno
== EINTR
) {
4604 for (i
= 0; i
< nb_fd
; i
++) {
4605 /* Fetch once the poll data */
4606 revents
= LTTNG_POLL_GETEV(&events
, i
);
4607 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
4609 health_code_update();
4612 /* No activity for this FD (poll implementation). */
4616 /* Thread quit pipe has been closed. Killing thread. */
4617 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
4623 /* Event on the registration socket */
4624 if (pollfd
== client_sock
) {
4625 if (revents
& LPOLLIN
) {
4627 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
4628 ERR("Client socket poll error");
4631 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
4637 DBG("Wait for client response");
4639 health_code_update();
4641 sock
= lttcomm_accept_unix_sock(client_sock
);
4647 * Set the CLOEXEC flag. Return code is useless because either way, the
4650 (void) utils_set_fd_cloexec(sock
);
4652 /* Set socket option for credentials retrieval */
4653 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
4658 /* Allocate context command to process the client request */
4659 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
4660 if (cmd_ctx
== NULL
) {
4661 PERROR("zmalloc cmd_ctx");
4665 /* Allocate data buffer for reception */
4666 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
4667 if (cmd_ctx
->lsm
== NULL
) {
4668 PERROR("zmalloc cmd_ctx->lsm");
4672 cmd_ctx
->llm
= NULL
;
4673 cmd_ctx
->session
= NULL
;
4675 health_code_update();
4678 * Data is received from the lttng client. The struct
4679 * lttcomm_session_msg (lsm) contains the command and data request of
4682 DBG("Receiving data from client ...");
4683 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
4684 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
4686 DBG("Nothing recv() from client... continuing");
4692 clean_command_ctx(&cmd_ctx
);
4696 health_code_update();
4698 // TODO: Validate cmd_ctx including sanity check for
4699 // security purpose.
4701 rcu_thread_online();
4703 * This function dispatch the work to the kernel or userspace tracer
4704 * libs and fill the lttcomm_lttng_msg data structure of all the needed
4705 * informations for the client. The command context struct contains
4706 * everything this function may needs.
4708 ret
= process_client_msg(cmd_ctx
, sock
, &sock_error
);
4709 rcu_thread_offline();
4717 * TODO: Inform client somehow of the fatal error. At
4718 * this point, ret < 0 means that a zmalloc failed
4719 * (ENOMEM). Error detected but still accept
4720 * command, unless a socket error has been
4723 clean_command_ctx(&cmd_ctx
);
4727 cmd_completion_handler
= cmd_pop_completion_handler();
4728 if (cmd_completion_handler
) {
4729 enum lttng_error_code completion_code
;
4731 completion_code
= cmd_completion_handler
->run(
4732 cmd_completion_handler
->data
);
4733 if (completion_code
!= LTTNG_OK
) {
4734 clean_command_ctx(&cmd_ctx
);
4739 health_code_update();
4741 DBG("Sending response (size: %d, retcode: %s (%d))",
4742 cmd_ctx
->lttng_msg_size
,
4743 lttng_strerror(-cmd_ctx
->llm
->ret_code
),
4744 cmd_ctx
->llm
->ret_code
);
4745 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
4747 ERR("Failed to send data back to client");
4750 /* End of transmission */
4757 clean_command_ctx(&cmd_ctx
);
4759 health_code_update();
4771 lttng_poll_clean(&events
);
4772 clean_command_ctx(&cmd_ctx
);
4776 unlink(config
.client_unix_sock_path
.value
);
4777 if (client_sock
>= 0) {
4778 ret
= close(client_sock
);
4786 ERR("Health error occurred in %s", __func__
);
4789 health_unregister(health_sessiond
);
4791 DBG("Client thread dying");
4793 rcu_unregister_thread();
4796 * Since we are creating the consumer threads, we own them, so we need
4797 * to join them before our thread exits.
4799 ret
= join_consumer_thread(&kconsumer_data
);
4802 PERROR("join_consumer");
4805 ret
= join_consumer_thread(&ustconsumer32_data
);
4808 PERROR("join_consumer ust32");
4811 ret
= join_consumer_thread(&ustconsumer64_data
);
4814 PERROR("join_consumer ust64");
4819 static int string_match(const char *str1
, const char *str2
)
4821 return (str1
&& str2
) && !strcmp(str1
, str2
);
4825 * Take an option from the getopt output and set it in the right variable to be
4828 * Return 0 on success else a negative value.
4830 static int set_option(int opt
, const char *arg
, const char *optname
)
4834 if (string_match(optname
, "client-sock") || opt
== 'c') {
4835 if (!arg
|| *arg
== '\0') {
4839 if (lttng_is_setuid_setgid()) {
4840 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4841 "-c, --client-sock");
4843 config_string_set(&config
.client_unix_sock_path
,
4845 if (!config
.client_unix_sock_path
.value
) {
4850 } else if (string_match(optname
, "apps-sock") || opt
== 'a') {
4851 if (!arg
|| *arg
== '\0') {
4855 if (lttng_is_setuid_setgid()) {
4856 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4859 config_string_set(&config
.apps_unix_sock_path
,
4861 if (!config
.apps_unix_sock_path
.value
) {
4866 } else if (string_match(optname
, "daemonize") || opt
== 'd') {
4867 config
.daemonize
= true;
4868 } else if (string_match(optname
, "background") || opt
== 'b') {
4869 config
.background
= true;
4870 } else if (string_match(optname
, "group") || opt
== 'g') {
4871 if (!arg
|| *arg
== '\0') {
4875 if (lttng_is_setuid_setgid()) {
4876 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4879 config_string_set(&config
.tracing_group_name
,
4881 if (!config
.tracing_group_name
.value
) {
4886 } else if (string_match(optname
, "help") || opt
== 'h') {
4887 ret
= utils_show_help(8, "lttng-sessiond", help_msg
);
4889 ERR("Cannot show --help for `lttng-sessiond`");
4892 exit(ret
? EXIT_FAILURE
: EXIT_SUCCESS
);
4893 } else if (string_match(optname
, "version") || opt
== 'V') {
4894 fprintf(stdout
, "%s\n", VERSION
);
4896 } else if (string_match(optname
, "sig-parent") || opt
== 'S') {
4897 config
.sig_parent
= true;
4898 } else if (string_match(optname
, "kconsumerd-err-sock")) {
4899 if (!arg
|| *arg
== '\0') {
4903 if (lttng_is_setuid_setgid()) {
4904 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4905 "--kconsumerd-err-sock");
4907 config_string_set(&config
.kconsumerd_err_unix_sock_path
,
4909 if (!config
.kconsumerd_err_unix_sock_path
.value
) {
4914 } else if (string_match(optname
, "kconsumerd-cmd-sock")) {
4915 if (!arg
|| *arg
== '\0') {
4919 if (lttng_is_setuid_setgid()) {
4920 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4921 "--kconsumerd-cmd-sock");
4923 config_string_set(&config
.kconsumerd_cmd_unix_sock_path
,
4925 if (!config
.kconsumerd_cmd_unix_sock_path
.value
) {
4930 } else if (string_match(optname
, "ustconsumerd64-err-sock")) {
4931 if (!arg
|| *arg
== '\0') {
4935 if (lttng_is_setuid_setgid()) {
4936 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4937 "--ustconsumerd64-err-sock");
4939 config_string_set(&config
.consumerd64_err_unix_sock_path
,
4941 if (!config
.consumerd64_err_unix_sock_path
.value
) {
4946 } else if (string_match(optname
, "ustconsumerd64-cmd-sock")) {
4947 if (!arg
|| *arg
== '\0') {
4951 if (lttng_is_setuid_setgid()) {
4952 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4953 "--ustconsumerd64-cmd-sock");
4955 config_string_set(&config
.consumerd64_cmd_unix_sock_path
,
4957 if (!config
.consumerd64_cmd_unix_sock_path
.value
) {
4962 } else if (string_match(optname
, "ustconsumerd32-err-sock")) {
4963 if (!arg
|| *arg
== '\0') {
4967 if (lttng_is_setuid_setgid()) {
4968 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4969 "--ustconsumerd32-err-sock");
4971 config_string_set(&config
.consumerd32_err_unix_sock_path
,
4973 if (!config
.consumerd32_err_unix_sock_path
.value
) {
4978 } else if (string_match(optname
, "ustconsumerd32-cmd-sock")) {
4979 if (!arg
|| *arg
== '\0') {
4983 if (lttng_is_setuid_setgid()) {
4984 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4985 "--ustconsumerd32-cmd-sock");
4987 config_string_set(&config
.consumerd32_cmd_unix_sock_path
,
4989 if (!config
.consumerd32_cmd_unix_sock_path
.value
) {
4994 } else if (string_match(optname
, "no-kernel")) {
4995 config
.no_kernel
= true;
4996 } else if (string_match(optname
, "quiet") || opt
== 'q') {
4997 config
.quiet
= true;
4998 } else if (string_match(optname
, "verbose") || opt
== 'v') {
4999 /* Verbose level can increase using multiple -v */
5001 /* Value obtained from config file */
5002 config
.verbose
= config_parse_value(arg
);
5004 /* -v used on command line */
5007 /* Clamp value to [0, 3] */
5008 config
.verbose
= config
.verbose
< 0 ? 0 :
5009 (config
.verbose
<= 3 ? config
.verbose
: 3);
5010 } else if (string_match(optname
, "verbose-consumer")) {
5012 config
.verbose_consumer
= config_parse_value(arg
);
5014 config
.verbose_consumer
++;
5016 } else if (string_match(optname
, "consumerd32-path")) {
5017 if (!arg
|| *arg
== '\0') {
5021 if (lttng_is_setuid_setgid()) {
5022 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5023 "--consumerd32-path");
5025 config_string_set(&config
.consumerd32_bin_path
,
5027 if (!config
.consumerd32_bin_path
.value
) {
5032 } else if (string_match(optname
, "consumerd32-libdir")) {
5033 if (!arg
|| *arg
== '\0') {
5037 if (lttng_is_setuid_setgid()) {
5038 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5039 "--consumerd32-libdir");
5041 config_string_set(&config
.consumerd32_lib_dir
,
5043 if (!config
.consumerd32_lib_dir
.value
) {
5048 } else if (string_match(optname
, "consumerd64-path")) {
5049 if (!arg
|| *arg
== '\0') {
5053 if (lttng_is_setuid_setgid()) {
5054 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5055 "--consumerd64-path");
5057 config_string_set(&config
.consumerd64_bin_path
,
5059 if (!config
.consumerd64_bin_path
.value
) {
5064 } else if (string_match(optname
, "consumerd64-libdir")) {
5065 if (!arg
|| *arg
== '\0') {
5069 if (lttng_is_setuid_setgid()) {
5070 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5071 "--consumerd64-libdir");
5073 config_string_set(&config
.consumerd64_lib_dir
,
5075 if (!config
.consumerd64_lib_dir
.value
) {
5080 } else if (string_match(optname
, "pidfile") || opt
== 'p') {
5081 if (!arg
|| *arg
== '\0') {
5085 if (lttng_is_setuid_setgid()) {
5086 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5089 config_string_set(&config
.pid_file_path
, strdup(arg
));
5090 if (!config
.pid_file_path
.value
) {
5095 } else if (string_match(optname
, "agent-tcp-port")) {
5096 if (!arg
|| *arg
== '\0') {
5100 if (lttng_is_setuid_setgid()) {
5101 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5102 "--agent-tcp-port");
5107 v
= strtoul(arg
, NULL
, 0);
5108 if (errno
!= 0 || !isdigit(arg
[0])) {
5109 ERR("Wrong value in --agent-tcp-port parameter: %s", arg
);
5112 if (v
== 0 || v
>= 65535) {
5113 ERR("Port overflow in --agent-tcp-port parameter: %s", arg
);
5116 config
.agent_tcp_port
.begin
= config
.agent_tcp_port
.end
= (int) v
;
5117 DBG3("Agent TCP port set to non default: %i", (int) v
);
5119 } else if (string_match(optname
, "load") || opt
== 'l') {
5120 if (!arg
|| *arg
== '\0') {
5124 if (lttng_is_setuid_setgid()) {
5125 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5128 config_string_set(&config
.load_session_path
, strdup(arg
));
5129 if (!config
.load_session_path
.value
) {
5134 } else if (string_match(optname
, "kmod-probes")) {
5135 if (!arg
|| *arg
== '\0') {
5139 if (lttng_is_setuid_setgid()) {
5140 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5143 config_string_set(&config
.kmod_probes_list
, strdup(arg
));
5144 if (!config
.kmod_probes_list
.value
) {
5149 } else if (string_match(optname
, "extra-kmod-probes")) {
5150 if (!arg
|| *arg
== '\0') {
5154 if (lttng_is_setuid_setgid()) {
5155 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5156 "--extra-kmod-probes");
5158 config_string_set(&config
.kmod_extra_probes_list
,
5160 if (!config
.kmod_extra_probes_list
.value
) {
5165 } else if (string_match(optname
, "config") || opt
== 'f') {
5166 /* This is handled in set_options() thus silent skip. */
5169 /* Unknown option or other error.
5170 * Error is printed by getopt, just return */
5175 if (ret
== -EINVAL
) {
5176 const char *opt_name
= "unknown";
5179 for (i
= 0; i
< sizeof(long_options
) / sizeof(struct option
);
5181 if (opt
== long_options
[i
].val
) {
5182 opt_name
= long_options
[i
].name
;
5187 WARN("Invalid argument provided for option \"%s\", using default value.",
5195 * config_entry_handler_cb used to handle options read from a config file.
5196 * See config_entry_handler_cb comment in common/config/session-config.h for the
5197 * return value conventions.
5199 static int config_entry_handler(const struct config_entry
*entry
, void *unused
)
5203 if (!entry
|| !entry
->name
|| !entry
->value
) {
5208 /* Check if the option is to be ignored */
5209 for (i
= 0; i
< sizeof(config_ignore_options
) / sizeof(char *); i
++) {
5210 if (!strcmp(entry
->name
, config_ignore_options
[i
])) {
5215 for (i
= 0; i
< (sizeof(long_options
) / sizeof(struct option
)) - 1;
5218 /* Ignore if not fully matched. */
5219 if (strcmp(entry
->name
, long_options
[i
].name
)) {
5224 * If the option takes no argument on the command line, we have to
5225 * check if the value is "true". We support non-zero numeric values,
5228 if (!long_options
[i
].has_arg
) {
5229 ret
= config_parse_value(entry
->value
);
5232 WARN("Invalid configuration value \"%s\" for option %s",
5233 entry
->value
, entry
->name
);
5235 /* False, skip boolean config option. */
5240 ret
= set_option(long_options
[i
].val
, entry
->value
, entry
->name
);
5244 WARN("Unrecognized option \"%s\" in daemon configuration file.", entry
->name
);
5251 * daemon configuration loading and argument parsing
5253 static int set_options(int argc
, char **argv
)
5255 int ret
= 0, c
= 0, option_index
= 0;
5256 int orig_optopt
= optopt
, orig_optind
= optind
;
5258 const char *config_path
= NULL
;
5260 optstring
= utils_generate_optstring(long_options
,
5261 sizeof(long_options
) / sizeof(struct option
));
5267 /* Check for the --config option */
5268 while ((c
= getopt_long(argc
, argv
, optstring
, long_options
,
5269 &option_index
)) != -1) {
5273 } else if (c
!= 'f') {
5274 /* if not equal to --config option. */
5278 if (lttng_is_setuid_setgid()) {
5279 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5282 config_path
= utils_expand_path(optarg
);
5284 ERR("Failed to resolve path: %s", optarg
);
5289 ret
= config_get_section_entries(config_path
, config_section_name
,
5290 config_entry_handler
, NULL
);
5293 ERR("Invalid configuration option at line %i", ret
);
5299 /* Reset getopt's global state */
5300 optopt
= orig_optopt
;
5301 optind
= orig_optind
;
5305 * getopt_long() will not set option_index if it encounters a
5308 c
= getopt_long(argc
, argv
, optstring
, long_options
,
5315 * Pass NULL as the long option name if popt left the index
5318 ret
= set_option(c
, optarg
,
5319 option_index
< 0 ? NULL
:
5320 long_options
[option_index
].name
);
5332 * Creates the two needed socket by the daemon.
5333 * apps_sock - The communication socket for all UST apps.
5334 * client_sock - The communication of the cli tool (lttng).
5336 static int init_daemon_socket(void)
5341 old_umask
= umask(0);
5343 /* Create client tool unix socket */
5344 client_sock
= lttcomm_create_unix_sock(config
.client_unix_sock_path
.value
);
5345 if (client_sock
< 0) {
5346 ERR("Create unix sock failed: %s", config
.client_unix_sock_path
.value
);
5351 /* Set the cloexec flag */
5352 ret
= utils_set_fd_cloexec(client_sock
);
5354 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
5355 "Continuing but note that the consumer daemon will have a "
5356 "reference to this socket on exec()", client_sock
);
5359 /* File permission MUST be 660 */
5360 ret
= chmod(config
.client_unix_sock_path
.value
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
5362 ERR("Set file permissions failed: %s", config
.client_unix_sock_path
.value
);
5367 /* Create the application unix socket */
5368 apps_sock
= lttcomm_create_unix_sock(config
.apps_unix_sock_path
.value
);
5369 if (apps_sock
< 0) {
5370 ERR("Create unix sock failed: %s", config
.apps_unix_sock_path
.value
);
5375 /* Set the cloexec flag */
5376 ret
= utils_set_fd_cloexec(apps_sock
);
5378 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
5379 "Continuing but note that the consumer daemon will have a "
5380 "reference to this socket on exec()", apps_sock
);
5383 /* File permission MUST be 666 */
5384 ret
= chmod(config
.apps_unix_sock_path
.value
,
5385 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
5387 ERR("Set file permissions failed: %s", config
.apps_unix_sock_path
.value
);
5392 DBG3("Session daemon client socket %d and application socket %d created",
5393 client_sock
, apps_sock
);
5401 * Create lockfile using the rundir and return its fd.
5403 static int create_lockfile(void)
5405 return utils_create_lock_file(config
.lock_file_path
.value
);
5409 * Check if the global socket is available, and if a daemon is answering at the
5410 * other side. If yes, error is returned.
5412 * Also attempts to create and hold the lock file.
5414 static int check_existing_daemon(void)
5418 /* Is there anybody out there ? */
5419 if (lttng_session_daemon_alive()) {
5424 lockfile_fd
= create_lockfile();
5425 if (lockfile_fd
< 0) {
5433 static void sessiond_cleanup_lock_file(void)
5438 * Cleanup lock file by deleting it and finaly closing it which will
5439 * release the file system lock.
5441 if (lockfile_fd
>= 0) {
5442 ret
= remove(config
.lock_file_path
.value
);
5444 PERROR("remove lock file");
5446 ret
= close(lockfile_fd
);
5448 PERROR("close lock file");
5454 * Set the tracing group gid onto the client socket.
5456 * Race window between mkdir and chown is OK because we are going from more
5457 * permissive (root.root) to less permissive (root.tracing).
5459 static int set_permissions(char *rundir
)
5464 gid
= utils_get_group_id(config
.tracing_group_name
.value
);
5466 /* Set lttng run dir */
5467 ret
= chown(rundir
, 0, gid
);
5469 ERR("Unable to set group on %s", rundir
);
5474 * Ensure all applications and tracing group can search the run
5475 * dir. Allow everyone to read the directory, since it does not
5476 * buy us anything to hide its content.
5478 ret
= chmod(rundir
, S_IRWXU
| S_IRGRP
| S_IXGRP
| S_IROTH
| S_IXOTH
);
5480 ERR("Unable to set permissions on %s", rundir
);
5484 /* lttng client socket path */
5485 ret
= chown(config
.client_unix_sock_path
.value
, 0, gid
);
5487 ERR("Unable to set group on %s", config
.client_unix_sock_path
.value
);
5491 /* kconsumer error socket path */
5492 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, 0);
5494 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
5498 /* 64-bit ustconsumer error socket path */
5499 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, 0);
5501 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
5505 /* 32-bit ustconsumer compat32 error socket path */
5506 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, 0);
5508 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
5512 DBG("All permissions are set");
5518 * Create the lttng run directory needed for all global sockets and pipe.
5520 static int create_lttng_rundir(void)
5524 DBG3("Creating LTTng run directory: %s", config
.rundir
.value
);
5526 ret
= mkdir(config
.rundir
.value
, S_IRWXU
);
5528 if (errno
!= EEXIST
) {
5529 ERR("Unable to create %s", config
.rundir
.value
);
5541 * Setup sockets and directory needed by the consumerds' communication with the
5544 static int set_consumer_sockets(struct consumer_data
*consumer_data
)
5549 switch (consumer_data
->type
) {
5550 case LTTNG_CONSUMER_KERNEL
:
5551 path
= config
.kconsumerd_path
.value
;
5553 case LTTNG_CONSUMER64_UST
:
5554 path
= config
.consumerd64_path
.value
;
5556 case LTTNG_CONSUMER32_UST
:
5557 path
= config
.consumerd32_path
.value
;
5560 ERR("Consumer type unknown");
5566 DBG2("Creating consumer directory: %s", path
);
5568 ret
= mkdir(path
, S_IRWXU
| S_IRGRP
| S_IXGRP
);
5569 if (ret
< 0 && errno
!= EEXIST
) {
5571 ERR("Failed to create %s", path
);
5575 ret
= chown(path
, 0, utils_get_group_id(config
.tracing_group_name
.value
));
5577 ERR("Unable to set group on %s", path
);
5583 /* Create the consumerd error unix socket */
5584 consumer_data
->err_sock
=
5585 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
5586 if (consumer_data
->err_sock
< 0) {
5587 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
5593 * Set the CLOEXEC flag. Return code is useless because either way, the
5596 ret
= utils_set_fd_cloexec(consumer_data
->err_sock
);
5598 PERROR("utils_set_fd_cloexec");
5599 /* continue anyway */
5602 /* File permission MUST be 660 */
5603 ret
= chmod(consumer_data
->err_unix_sock_path
,
5604 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
5606 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
5616 * Signal handler for the daemon
5618 * Simply stop all worker threads, leaving main() return gracefully after
5619 * joining all threads and calling cleanup().
5621 static void sighandler(int sig
)
5625 DBG("SIGINT caught");
5629 DBG("SIGTERM caught");
5633 CMM_STORE_SHARED(recv_child_signal
, 1);
5641 * Setup signal handler for :
5642 * SIGINT, SIGTERM, SIGPIPE
5644 static int set_signal_handler(void)
5647 struct sigaction sa
;
5650 if ((ret
= sigemptyset(&sigset
)) < 0) {
5651 PERROR("sigemptyset");
5655 sa
.sa_mask
= sigset
;
5658 sa
.sa_handler
= sighandler
;
5659 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
5660 PERROR("sigaction");
5664 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
5665 PERROR("sigaction");
5669 if ((ret
= sigaction(SIGUSR1
, &sa
, NULL
)) < 0) {
5670 PERROR("sigaction");
5674 sa
.sa_handler
= SIG_IGN
;
5675 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
5676 PERROR("sigaction");
5680 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
5686 * Set open files limit to unlimited. This daemon can open a large number of
5687 * file descriptors in order to consume multiple kernel traces.
5689 static void set_ulimit(void)
5694 /* The kernel does not allow an infinite limit for open files */
5695 lim
.rlim_cur
= 65535;
5696 lim
.rlim_max
= 65535;
5698 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
5700 PERROR("failed to set open files limit");
5704 static int write_pidfile(void)
5706 return utils_create_pid_file(getpid(), config
.pid_file_path
.value
);
5709 static int set_clock_plugin_env(void)
5712 char *env_value
= NULL
;
5714 if (!config
.lttng_ust_clock_plugin
.value
) {
5718 ret
= asprintf(&env_value
, "LTTNG_UST_CLOCK_PLUGIN=%s",
5719 config
.lttng_ust_clock_plugin
.value
);
5725 ret
= putenv(env_value
);
5728 PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN");
5732 DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"",
5733 config
.lttng_ust_clock_plugin
.value
);
5739 struct rotation_thread_timer_queue
*create_rotate_timer_queue(void)
5741 struct rotation_thread_timer_queue
*queue
= NULL
;
5743 queue
= zmalloc(sizeof(struct rotation_thread_timer_queue
));
5745 PERROR("Failed to allocate timer rotate queue");
5749 queue
->event_pipe
= lttng_pipe_open(FD_CLOEXEC
| O_NONBLOCK
);
5750 CDS_INIT_LIST_HEAD(&queue
->list
);
5751 pthread_mutex_init(&queue
->lock
, NULL
);
5758 void destroy_rotate_timer_queue(struct rotation_thread_timer_queue
*queue
)
5760 struct sessiond_rotation_timer
*node
, *tmp_node
;
5766 lttng_pipe_destroy(queue
->event_pipe
);
5768 pthread_mutex_lock(&queue
->lock
);
5769 /* Empty wait queue. */
5770 cds_list_for_each_entry_safe(node
, tmp_node
, &queue
->list
, head
) {
5771 cds_list_del(&node
->head
);
5774 pthread_mutex_unlock(&queue
->lock
);
5776 pthread_mutex_destroy(&queue
->lock
);
5783 int main(int argc
, char **argv
)
5785 int ret
= 0, retval
= 0;
5787 const char *env_app_timeout
;
5788 struct lttng_pipe
*ust32_channel_monitor_pipe
= NULL
,
5789 *ust64_channel_monitor_pipe
= NULL
,
5790 *kernel_channel_monitor_pipe
= NULL
;
5791 bool notification_thread_launched
= false;
5792 bool rotation_thread_launched
= false;
5793 bool timer_thread_launched
= false;
5794 struct lttng_pipe
*ust32_channel_rotate_pipe
= NULL
,
5795 *ust64_channel_rotate_pipe
= NULL
,
5796 *kernel_channel_rotate_pipe
= NULL
;
5797 struct timer_thread_parameters timer_thread_ctx
;
5798 /* Queue of rotation jobs populated by the sessiond-timer. */
5799 struct rotation_thread_timer_queue
*rotation_timer_queue
= NULL
;
5800 sem_t notification_thread_ready
;
5802 init_kernel_workarounds();
5804 rcu_register_thread();
5806 if (set_signal_handler()) {
5808 goto exit_set_signal_handler
;
5811 if (sessiond_timer_signal_init()) {
5813 goto exit_set_signal_handler
;
5816 page_size
= sysconf(_SC_PAGESIZE
);
5817 if (page_size
< 0) {
5818 PERROR("sysconf _SC_PAGESIZE");
5819 page_size
= LONG_MAX
;
5820 WARN("Fallback page size to %ld", page_size
);
5823 ret
= sessiond_config_init(&config
);
5826 goto exit_set_signal_handler
;
5830 * Init config from environment variables.
5831 * Command line option override env configuration per-doc. Do env first.
5833 sessiond_config_apply_env_config(&config
);
5836 * Parse arguments and load the daemon configuration file.
5838 * We have an exit_options exit path to free memory reserved by
5839 * set_options. This is needed because the rest of sessiond_cleanup()
5840 * depends on ht_cleanup_thread, which depends on lttng_daemonize, which
5841 * depends on set_options.
5844 if (set_options(argc
, argv
)) {
5850 * Resolve all paths received as arguments, configuration option, or
5851 * through environment variable as absolute paths. This is necessary
5852 * since daemonizing causes the sessiond's current working directory
5855 ret
= sessiond_config_resolve_paths(&config
);
5861 lttng_opt_verbose
= config
.verbose
;
5862 lttng_opt_quiet
= config
.quiet
;
5863 kconsumer_data
.err_unix_sock_path
=
5864 config
.kconsumerd_err_unix_sock_path
.value
;
5865 kconsumer_data
.cmd_unix_sock_path
=
5866 config
.kconsumerd_cmd_unix_sock_path
.value
;
5867 ustconsumer32_data
.err_unix_sock_path
=
5868 config
.consumerd32_err_unix_sock_path
.value
;
5869 ustconsumer32_data
.cmd_unix_sock_path
=
5870 config
.consumerd32_cmd_unix_sock_path
.value
;
5871 ustconsumer64_data
.err_unix_sock_path
=
5872 config
.consumerd64_err_unix_sock_path
.value
;
5873 ustconsumer64_data
.cmd_unix_sock_path
=
5874 config
.consumerd64_cmd_unix_sock_path
.value
;
5875 set_clock_plugin_env();
5877 sessiond_config_log(&config
);
5879 if (create_lttng_rundir()) {
5884 /* Abort launch if a session daemon is already running. */
5885 if (check_existing_daemon()) {
5886 ERR("A session daemon is already running.");
5892 if (config
.daemonize
|| config
.background
) {
5895 ret
= lttng_daemonize(&child_ppid
, &recv_child_signal
,
5896 !config
.background
);
5903 * We are in the child. Make sure all other file descriptors are
5904 * closed, in case we are called with more opened file
5905 * descriptors than the standard ones and the lock file.
5907 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
5908 if (i
== lockfile_fd
) {
5915 if (run_as_create_worker(argv
[0]) < 0) {
5916 goto exit_create_run_as_worker_cleanup
;
5920 * Starting from here, we can create threads. This needs to be after
5921 * lttng_daemonize due to RCU.
5925 * Initialize the health check subsystem. This call should set the
5926 * appropriate time values.
5928 health_sessiond
= health_app_create(NR_HEALTH_SESSIOND_TYPES
);
5929 if (!health_sessiond
) {
5930 PERROR("health_app_create error");
5932 goto exit_health_sessiond_cleanup
;
5935 /* Create thread to clean up RCU hash tables */
5936 if (init_ht_cleanup_thread(&ht_cleanup_thread
)) {
5938 goto exit_ht_cleanup
;
5941 /* Create thread quit pipe */
5942 if (init_thread_quit_pipe()) {
5944 goto exit_init_data
;
5947 /* Check if daemon is UID = 0 */
5948 is_root
= !getuid();
5950 /* Create global run dir with root access */
5952 kernel_channel_monitor_pipe
= lttng_pipe_open(0);
5953 if (!kernel_channel_monitor_pipe
) {
5954 ERR("Failed to create kernel consumer channel monitor pipe");
5956 goto exit_init_data
;
5958 kconsumer_data
.channel_monitor_pipe
=
5959 lttng_pipe_release_writefd(
5960 kernel_channel_monitor_pipe
);
5961 if (kconsumer_data
.channel_monitor_pipe
< 0) {
5963 goto exit_init_data
;
5965 kernel_channel_rotate_pipe
= lttng_pipe_open(0);
5966 if (!kernel_channel_rotate_pipe
) {
5967 ERR("Failed to create kernel consumer channel rotate pipe");
5969 goto exit_init_data
;
5971 kconsumer_data
.channel_rotate_pipe
=
5972 lttng_pipe_release_writefd(
5973 kernel_channel_rotate_pipe
);
5974 if (kconsumer_data
.channel_rotate_pipe
< 0) {
5976 goto exit_init_data
;
5980 /* Set consumer initial state */
5981 kernel_consumerd_state
= CONSUMER_STOPPED
;
5982 ust_consumerd_state
= CONSUMER_STOPPED
;
5984 ust32_channel_monitor_pipe
= lttng_pipe_open(0);
5985 if (!ust32_channel_monitor_pipe
) {
5986 ERR("Failed to create 32-bit user space consumer channel monitor pipe");
5988 goto exit_init_data
;
5990 ustconsumer32_data
.channel_monitor_pipe
= lttng_pipe_release_writefd(
5991 ust32_channel_monitor_pipe
);
5992 if (ustconsumer32_data
.channel_monitor_pipe
< 0) {
5994 goto exit_init_data
;
5996 ust32_channel_rotate_pipe
= lttng_pipe_open(0);
5997 if (!ust32_channel_rotate_pipe
) {
5998 ERR("Failed to create 32-bit user space consumer channel rotate pipe");
6000 goto exit_init_data
;
6002 ustconsumer32_data
.channel_rotate_pipe
= lttng_pipe_release_writefd(
6003 ust32_channel_rotate_pipe
);
6004 if (ustconsumer32_data
.channel_rotate_pipe
< 0) {
6006 goto exit_init_data
;
6010 * The rotation_timer_queue structure is shared between the sessiond timer
6011 * thread and the rotation thread. The main() keeps the ownership and
6012 * destroys it when both threads have quit.
6014 rotation_timer_queue
= create_rotate_timer_queue();
6015 if (!rotation_timer_queue
) {
6017 goto exit_init_data
;
6019 timer_thread_ctx
.rotation_timer_queue
= rotation_timer_queue
;
6021 ust64_channel_monitor_pipe
= lttng_pipe_open(0);
6022 if (!ust64_channel_monitor_pipe
) {
6023 ERR("Failed to create 64-bit user space consumer channel monitor pipe");
6025 goto exit_init_data
;
6027 ustconsumer64_data
.channel_monitor_pipe
= lttng_pipe_release_writefd(
6028 ust64_channel_monitor_pipe
);
6029 if (ustconsumer64_data
.channel_monitor_pipe
< 0) {
6031 goto exit_init_data
;
6033 ust64_channel_rotate_pipe
= lttng_pipe_open(0);
6034 if (!ust64_channel_rotate_pipe
) {
6035 ERR("Failed to create 64-bit user space consumer channel rotate pipe");
6037 goto exit_init_data
;
6039 ustconsumer64_data
.channel_rotate_pipe
= lttng_pipe_release_writefd(
6040 ust64_channel_rotate_pipe
);
6041 if (ustconsumer64_data
.channel_rotate_pipe
< 0) {
6043 goto exit_init_data
;
6047 * Init UST app hash table. Alloc hash table before this point since
6048 * cleanup() can get called after that point.
6050 if (ust_app_ht_alloc()) {
6051 ERR("Failed to allocate UST app hash table");
6053 goto exit_init_data
;
6057 * Initialize agent app hash table. We allocate the hash table here
6058 * since cleanup() can get called after this point.
6060 if (agent_app_ht_alloc()) {
6061 ERR("Failed to allocate Agent app hash table");
6063 goto exit_init_data
;
6067 * These actions must be executed as root. We do that *after* setting up
6068 * the sockets path because we MUST make the check for another daemon using
6069 * those paths *before* trying to set the kernel consumer sockets and init
6073 if (set_consumer_sockets(&kconsumer_data
)) {
6075 goto exit_init_data
;
6078 /* Setup kernel tracer */
6079 if (!config
.no_kernel
) {
6080 init_kernel_tracer();
6081 if (kernel_tracer_fd
>= 0) {
6082 ret
= syscall_init_table();
6084 ERR("Unable to populate syscall table. "
6085 "Syscall tracing won't work "
6086 "for this session daemon.");
6091 /* Set ulimit for open files */
6094 /* init lttng_fd tracking must be done after set_ulimit. */
6097 if (set_consumer_sockets(&ustconsumer64_data
)) {
6099 goto exit_init_data
;
6102 if (set_consumer_sockets(&ustconsumer32_data
)) {
6104 goto exit_init_data
;
6107 /* Setup the needed unix socket */
6108 if (init_daemon_socket()) {
6110 goto exit_init_data
;
6113 /* Set credentials to socket */
6114 if (is_root
&& set_permissions(config
.rundir
.value
)) {
6116 goto exit_init_data
;
6119 /* Get parent pid if -S, --sig-parent is specified. */
6120 if (config
.sig_parent
) {
6124 /* Setup the kernel pipe for waking up the kernel thread */
6125 if (is_root
&& !config
.no_kernel
) {
6126 if (utils_create_pipe_cloexec(kernel_poll_pipe
)) {
6128 goto exit_init_data
;
6132 /* Setup the thread apps communication pipe. */
6133 if (utils_create_pipe_cloexec(apps_cmd_pipe
)) {
6135 goto exit_init_data
;
6138 /* Setup the thread apps notify communication pipe. */
6139 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe
)) {
6141 goto exit_init_data
;
6144 /* Initialize global buffer per UID and PID registry. */
6145 buffer_reg_init_uid_registry();
6146 buffer_reg_init_pid_registry();
6148 /* Init UST command queue. */
6149 cds_wfcq_init(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
);
6152 * Get session list pointer. This pointer MUST NOT be free'd. This list
6153 * is statically declared in session.c
6155 session_list_ptr
= session_get_list();
6159 /* Check for the application socket timeout env variable. */
6160 env_app_timeout
= getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV
);
6161 if (env_app_timeout
) {
6162 config
.app_socket_timeout
= atoi(env_app_timeout
);
6164 config
.app_socket_timeout
= DEFAULT_APP_SOCKET_RW_TIMEOUT
;
6167 ret
= write_pidfile();
6169 ERR("Error in write_pidfile");
6171 goto exit_init_data
;
6174 /* Initialize communication library */
6176 /* Initialize TCP timeout values */
6177 lttcomm_inet_init();
6179 if (load_session_init_data(&load_info
) < 0) {
6181 goto exit_init_data
;
6183 load_info
->path
= config
.load_session_path
.value
;
6185 /* Create health-check thread. */
6186 ret
= pthread_create(&health_thread
, default_pthread_attr(),
6187 thread_manage_health
, (void *) NULL
);
6190 PERROR("pthread_create health");
6196 * The rotation thread needs the notification thread to be ready before
6197 * creating the rotate_notification_channel, so we use this semaphore as
6198 * a rendez-vous point.
6200 sem_init(¬ification_thread_ready
, 0, 0);
6202 /* notification_thread_data acquires the pipes' read side. */
6203 notification_thread_handle
= notification_thread_handle_create(
6204 ust32_channel_monitor_pipe
,
6205 ust64_channel_monitor_pipe
,
6206 kernel_channel_monitor_pipe
,
6207 ¬ification_thread_ready
);
6208 if (!notification_thread_handle
) {
6210 ERR("Failed to create notification thread shared data");
6212 goto exit_notification
;
6215 /* Create notification thread. */
6216 ret
= pthread_create(¬ification_thread
, default_pthread_attr(),
6217 thread_notification
, notification_thread_handle
);
6220 PERROR("pthread_create notification");
6223 goto exit_notification
;
6225 notification_thread_launched
= true;
6227 /* Create timer thread. */
6228 ret
= pthread_create(&timer_thread
, default_pthread_attr(),
6229 sessiond_timer_thread
, &timer_thread_ctx
);
6232 PERROR("pthread_create timer");
6235 goto exit_notification
;
6237 timer_thread_launched
= true;
6239 /* rotation_thread_data acquires the pipes' read side. */
6240 rotation_thread_handle
= rotation_thread_handle_create(
6241 ust32_channel_rotate_pipe
,
6242 ust64_channel_rotate_pipe
,
6243 kernel_channel_rotate_pipe
,
6244 thread_quit_pipe
[0],
6245 rotation_timer_queue
,
6246 notification_thread_handle
,
6247 ¬ification_thread_ready
);
6248 if (!rotation_thread_handle
) {
6250 ERR("Failed to create rotation thread shared data");
6255 /* Create rotation thread. */
6256 ret
= pthread_create(&rotation_thread
, default_pthread_attr(),
6257 thread_rotation
, rotation_thread_handle
);
6260 PERROR("pthread_create rotation");
6265 rotation_thread_launched
= true;
6267 /* Create thread to manage the client socket */
6268 ret
= pthread_create(&client_thread
, default_pthread_attr(),
6269 thread_manage_clients
, (void *) NULL
);
6272 PERROR("pthread_create clients");
6278 /* Create thread to dispatch registration */
6279 ret
= pthread_create(&dispatch_thread
, default_pthread_attr(),
6280 thread_dispatch_ust_registration
, (void *) NULL
);
6283 PERROR("pthread_create dispatch");
6289 /* Create thread to manage application registration. */
6290 ret
= pthread_create(®_apps_thread
, default_pthread_attr(),
6291 thread_registration_apps
, (void *) NULL
);
6294 PERROR("pthread_create registration");
6300 /* Create thread to manage application socket */
6301 ret
= pthread_create(&apps_thread
, default_pthread_attr(),
6302 thread_manage_apps
, (void *) NULL
);
6305 PERROR("pthread_create apps");
6311 /* Create thread to manage application notify socket */
6312 ret
= pthread_create(&apps_notify_thread
, default_pthread_attr(),
6313 ust_thread_manage_notify
, (void *) NULL
);
6316 PERROR("pthread_create notify");
6319 goto exit_apps_notify
;
6322 /* Create agent registration thread. */
6323 ret
= pthread_create(&agent_reg_thread
, default_pthread_attr(),
6324 agent_thread_manage_registration
, (void *) NULL
);
6327 PERROR("pthread_create agent");
6330 goto exit_agent_reg
;
6333 /* Don't start this thread if kernel tracing is not requested nor root */
6334 if (is_root
&& !config
.no_kernel
) {
6335 /* Create kernel thread to manage kernel event */
6336 ret
= pthread_create(&kernel_thread
, default_pthread_attr(),
6337 thread_manage_kernel
, (void *) NULL
);
6340 PERROR("pthread_create kernel");
6347 /* Create session loading thread. */
6348 ret
= pthread_create(&load_session_thread
, default_pthread_attr(),
6349 thread_load_session
, load_info
);
6352 PERROR("pthread_create load_session_thread");
6355 goto exit_load_session
;
6359 * This is where we start awaiting program completion (e.g. through
6360 * signal that asks threads to teardown).
6363 ret
= pthread_join(load_session_thread
, &status
);
6366 PERROR("pthread_join load_session_thread");
6371 if (is_root
&& !config
.no_kernel
) {
6372 ret
= pthread_join(kernel_thread
, &status
);
6375 PERROR("pthread_join");
6381 ret
= pthread_join(agent_reg_thread
, &status
);
6384 PERROR("pthread_join agent");
6389 ret
= pthread_join(apps_notify_thread
, &status
);
6392 PERROR("pthread_join apps notify");
6397 ret
= pthread_join(apps_thread
, &status
);
6400 PERROR("pthread_join apps");
6405 ret
= pthread_join(reg_apps_thread
, &status
);
6408 PERROR("pthread_join");
6414 * Join dispatch thread after joining reg_apps_thread to ensure
6415 * we don't leak applications in the queue.
6417 ret
= pthread_join(dispatch_thread
, &status
);
6420 PERROR("pthread_join");
6425 ret
= pthread_join(client_thread
, &status
);
6428 PERROR("pthread_join");
6435 sem_destroy(¬ification_thread_ready
);
6436 ret
= pthread_join(health_thread
, &status
);
6439 PERROR("pthread_join health thread");
6446 * Wait for all pending call_rcu work to complete before tearing
6447 * down data structures. call_rcu worker may be trying to
6448 * perform lookups in those structures.
6452 * sessiond_cleanup() is called when no other thread is running, except
6453 * the ht_cleanup thread, which is needed to destroy the hash tables.
6455 rcu_thread_online();
6459 * Ensure all prior call_rcu are done. call_rcu callbacks may push
6460 * hash tables to the ht_cleanup thread. Therefore, we ensure that
6461 * the queue is empty before shutting down the clean-up thread.
6466 * The teardown of the notification system is performed after the
6467 * session daemon's teardown in order to allow it to be notified
6468 * of the active session and channels at the moment of the teardown.
6470 if (notification_thread_handle
) {
6471 if (notification_thread_launched
) {
6472 notification_thread_command_quit(
6473 notification_thread_handle
);
6474 ret
= pthread_join(notification_thread
, &status
);
6477 PERROR("pthread_join notification thread");
6481 notification_thread_handle_destroy(notification_thread_handle
);
6484 if (rotation_thread_handle
) {
6485 if (rotation_thread_launched
) {
6486 ret
= pthread_join(rotation_thread
, &status
);
6489 PERROR("pthread_join rotation thread");
6493 rotation_thread_handle_destroy(rotation_thread_handle
);
6496 if (timer_thread_launched
) {
6497 kill(getpid(), LTTNG_SESSIOND_SIG_EXIT
);
6498 ret
= pthread_join(timer_thread
, &status
);
6501 PERROR("pthread_join timer thread");
6507 * After the rotation and timer thread have quit, we can safely destroy
6508 * the rotation_timer_queue.
6510 destroy_rotate_timer_queue(rotation_timer_queue
);
6512 rcu_thread_offline();
6513 rcu_unregister_thread();
6515 ret
= fini_ht_cleanup_thread(&ht_cleanup_thread
);
6519 lttng_pipe_destroy(ust32_channel_monitor_pipe
);
6520 lttng_pipe_destroy(ust64_channel_monitor_pipe
);
6521 lttng_pipe_destroy(kernel_channel_monitor_pipe
);
6522 lttng_pipe_destroy(ust32_channel_rotate_pipe
);
6523 lttng_pipe_destroy(ust64_channel_rotate_pipe
);
6524 lttng_pipe_destroy(kernel_channel_rotate_pipe
);
6527 health_app_destroy(health_sessiond
);
6528 exit_health_sessiond_cleanup
:
6529 exit_create_run_as_worker_cleanup
:
6532 sessiond_cleanup_lock_file();
6533 sessiond_cleanup_options();
6535 exit_set_signal_handler
: