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 * The _return variant is used since the implied memory barriers are
372 (void) uatomic_sub_return(<tng_sessiond_ready
, 1);
376 int __sessiond_set_thread_pollset(struct lttng_poll_event
*events
, size_t size
,
383 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
389 ret
= lttng_poll_add(events
, a_pipe
[0], LPOLLIN
| LPOLLERR
);
401 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
403 int sessiond_set_thread_pollset(struct lttng_poll_event
*events
, size_t size
)
405 return __sessiond_set_thread_pollset(events
, size
, thread_quit_pipe
);
409 * Init thread quit pipe.
411 * Return -1 on error or 0 if all pipes are created.
413 static int __init_thread_quit_pipe(int *a_pipe
)
419 PERROR("thread quit pipe");
423 for (i
= 0; i
< 2; i
++) {
424 ret
= fcntl(a_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
435 static int init_thread_quit_pipe(void)
437 return __init_thread_quit_pipe(thread_quit_pipe
);
441 * Stop all threads by closing the thread quit pipe.
443 static void stop_threads(void)
447 /* Stopping all threads */
448 DBG("Terminating all threads");
449 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
451 ERR("write error on thread quit pipe");
454 /* Dispatch thread */
455 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
456 futex_nto1_wake(&ust_cmd_queue
.futex
);
460 * Close every consumer sockets.
462 static void close_consumer_sockets(void)
466 if (kconsumer_data
.err_sock
>= 0) {
467 ret
= close(kconsumer_data
.err_sock
);
469 PERROR("kernel consumer err_sock close");
472 if (ustconsumer32_data
.err_sock
>= 0) {
473 ret
= close(ustconsumer32_data
.err_sock
);
475 PERROR("UST consumerd32 err_sock close");
478 if (ustconsumer64_data
.err_sock
>= 0) {
479 ret
= close(ustconsumer64_data
.err_sock
);
481 PERROR("UST consumerd64 err_sock close");
484 if (kconsumer_data
.cmd_sock
>= 0) {
485 ret
= close(kconsumer_data
.cmd_sock
);
487 PERROR("kernel consumer cmd_sock close");
490 if (ustconsumer32_data
.cmd_sock
>= 0) {
491 ret
= close(ustconsumer32_data
.cmd_sock
);
493 PERROR("UST consumerd32 cmd_sock close");
496 if (ustconsumer64_data
.cmd_sock
>= 0) {
497 ret
= close(ustconsumer64_data
.cmd_sock
);
499 PERROR("UST consumerd64 cmd_sock close");
502 if (kconsumer_data
.channel_monitor_pipe
>= 0) {
503 ret
= close(kconsumer_data
.channel_monitor_pipe
);
505 PERROR("kernel consumer channel monitor pipe close");
508 if (ustconsumer32_data
.channel_monitor_pipe
>= 0) {
509 ret
= close(ustconsumer32_data
.channel_monitor_pipe
);
511 PERROR("UST consumerd32 channel monitor pipe close");
514 if (ustconsumer64_data
.channel_monitor_pipe
>= 0) {
515 ret
= close(ustconsumer64_data
.channel_monitor_pipe
);
517 PERROR("UST consumerd64 channel monitor pipe close");
520 if (kconsumer_data
.channel_rotate_pipe
>= 0) {
521 ret
= close(kconsumer_data
.channel_rotate_pipe
);
523 PERROR("kernel consumer channel rotate pipe close");
526 if (ustconsumer32_data
.channel_rotate_pipe
>= 0) {
527 ret
= close(ustconsumer32_data
.channel_rotate_pipe
);
529 PERROR("UST consumerd32 channel rotate pipe close");
532 if (ustconsumer64_data
.channel_rotate_pipe
>= 0) {
533 ret
= close(ustconsumer64_data
.channel_rotate_pipe
);
535 PERROR("UST consumerd64 channel rotate pipe close");
541 * Wait on consumer process termination.
543 * Need to be called with the consumer data lock held or from a context
544 * ensuring no concurrent access to data (e.g: cleanup).
546 static void wait_consumer(struct consumer_data
*consumer_data
)
551 if (consumer_data
->pid
<= 0) {
555 DBG("Waiting for complete teardown of consumerd (PID: %d)",
557 ret
= waitpid(consumer_data
->pid
, &status
, 0);
559 PERROR("consumerd waitpid pid: %d", consumer_data
->pid
)
560 } else if (!WIFEXITED(status
)) {
561 ERR("consumerd termination with error: %d",
564 consumer_data
->pid
= 0;
568 * Cleanup the session daemon's data structures.
570 static void sessiond_cleanup(void)
573 struct ltt_session
*sess
, *stmp
;
575 DBG("Cleanup sessiond");
578 * Close the thread quit pipe. It has already done its job,
579 * since we are now called.
581 utils_close_pipe(thread_quit_pipe
);
584 * If config.pid_file_path.value is undefined, the default file will be
585 * wiped when removing the rundir.
587 if (config
.pid_file_path
.value
) {
588 ret
= remove(config
.pid_file_path
.value
);
590 PERROR("remove pidfile %s", config
.pid_file_path
.value
);
594 DBG("Removing sessiond and consumerd content of directory %s",
595 config
.rundir
.value
);
598 DBG("Removing %s", config
.pid_file_path
.value
);
599 (void) unlink(config
.pid_file_path
.value
);
601 DBG("Removing %s", config
.agent_port_file_path
.value
);
602 (void) unlink(config
.agent_port_file_path
.value
);
605 DBG("Removing %s", kconsumer_data
.err_unix_sock_path
);
606 (void) unlink(kconsumer_data
.err_unix_sock_path
);
608 DBG("Removing directory %s", config
.kconsumerd_path
.value
);
609 (void) rmdir(config
.kconsumerd_path
.value
);
611 /* ust consumerd 32 */
612 DBG("Removing %s", config
.consumerd32_err_unix_sock_path
.value
);
613 (void) unlink(config
.consumerd32_err_unix_sock_path
.value
);
615 DBG("Removing directory %s", config
.consumerd32_path
.value
);
616 (void) rmdir(config
.consumerd32_path
.value
);
618 /* ust consumerd 64 */
619 DBG("Removing %s", config
.consumerd64_err_unix_sock_path
.value
);
620 (void) unlink(config
.consumerd64_err_unix_sock_path
.value
);
622 DBG("Removing directory %s", config
.consumerd64_path
.value
);
623 (void) rmdir(config
.consumerd64_path
.value
);
625 DBG("Cleaning up all sessions");
627 /* Destroy session list mutex */
628 if (session_list_ptr
!= NULL
) {
629 pthread_mutex_destroy(&session_list_ptr
->lock
);
631 /* Cleanup ALL session */
632 cds_list_for_each_entry_safe(sess
, stmp
,
633 &session_list_ptr
->head
, list
) {
634 cmd_destroy_session(sess
, kernel_poll_pipe
[1],
635 notification_thread_handle
);
639 wait_consumer(&kconsumer_data
);
640 wait_consumer(&ustconsumer64_data
);
641 wait_consumer(&ustconsumer32_data
);
643 DBG("Cleaning up all agent apps");
644 agent_app_ht_clean();
646 DBG("Closing all UST sockets");
647 ust_app_clean_list();
648 buffer_reg_destroy_registries();
650 if (is_root
&& !config
.no_kernel
) {
651 DBG2("Closing kernel fd");
652 if (kernel_tracer_fd
>= 0) {
653 ret
= close(kernel_tracer_fd
);
658 DBG("Unloading kernel modules");
659 modprobe_remove_lttng_all();
663 close_consumer_sockets();
666 load_session_destroy_data(load_info
);
671 * We do NOT rmdir rundir because there are other processes
672 * using it, for instance lttng-relayd, which can start in
673 * parallel with this teardown.
678 * Cleanup the daemon's option data structures.
680 static void sessiond_cleanup_options(void)
682 DBG("Cleaning up options");
684 sessiond_config_fini(&config
);
686 run_as_destroy_worker();
690 * Send data on a unix socket using the liblttsessiondcomm API.
692 * Return lttcomm error code.
694 static int send_unix_sock(int sock
, void *buf
, size_t len
)
696 /* Check valid length */
701 return lttcomm_send_unix_sock(sock
, buf
, len
);
705 * Free memory of a command context structure.
707 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
709 DBG("Clean command context structure");
711 if ((*cmd_ctx
)->llm
) {
712 free((*cmd_ctx
)->llm
);
714 if ((*cmd_ctx
)->lsm
) {
715 free((*cmd_ctx
)->lsm
);
723 * Notify UST applications using the shm mmap futex.
725 static int notify_ust_apps(int active
)
729 DBG("Notifying applications of session daemon state: %d", active
);
731 /* See shm.c for this call implying mmap, shm and futex calls */
732 wait_shm_mmap
= shm_ust_get_mmap(config
.wait_shm_path
.value
, is_root
);
733 if (wait_shm_mmap
== NULL
) {
737 /* Wake waiting process */
738 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
740 /* Apps notified successfully */
748 * Setup the outgoing data buffer for the response (llm) by allocating the
749 * right amount of memory and copying the original information from the lsm
752 * Return 0 on success, negative value on error.
754 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
,
755 const void *payload_buf
, size_t payload_len
,
756 const void *cmd_header_buf
, size_t cmd_header_len
)
759 const size_t header_len
= sizeof(struct lttcomm_lttng_msg
);
760 const size_t cmd_header_offset
= header_len
;
761 const size_t payload_offset
= cmd_header_offset
+ cmd_header_len
;
762 const size_t total_msg_size
= header_len
+ cmd_header_len
+ payload_len
;
764 cmd_ctx
->llm
= zmalloc(total_msg_size
);
766 if (cmd_ctx
->llm
== NULL
) {
772 /* Copy common data */
773 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
774 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
775 cmd_ctx
->llm
->cmd_header_size
= cmd_header_len
;
776 cmd_ctx
->llm
->data_size
= payload_len
;
777 cmd_ctx
->lttng_msg_size
= total_msg_size
;
779 /* Copy command header */
780 if (cmd_header_len
) {
781 memcpy(((uint8_t *) cmd_ctx
->llm
) + cmd_header_offset
, cmd_header_buf
,
787 memcpy(((uint8_t *) cmd_ctx
->llm
) + payload_offset
, payload_buf
,
796 * Version of setup_lttng_msg() without command header.
798 static int setup_lttng_msg_no_cmd_header(struct command_ctx
*cmd_ctx
,
799 void *payload_buf
, size_t payload_len
)
801 return setup_lttng_msg(cmd_ctx
, payload_buf
, payload_len
, NULL
, 0);
804 * Update the kernel poll set of all channel fd available over all tracing
805 * session. Add the wakeup pipe at the end of the set.
807 static int update_kernel_poll(struct lttng_poll_event
*events
)
810 struct ltt_session
*session
;
811 struct ltt_kernel_channel
*channel
;
813 DBG("Updating kernel poll set");
816 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
817 session_lock(session
);
818 if (session
->kernel_session
== NULL
) {
819 session_unlock(session
);
823 cds_list_for_each_entry(channel
,
824 &session
->kernel_session
->channel_list
.head
, list
) {
825 /* Add channel fd to the kernel poll set */
826 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
828 session_unlock(session
);
831 DBG("Channel fd %d added to kernel set", channel
->fd
);
833 session_unlock(session
);
835 session_unlock_list();
840 session_unlock_list();
845 * Find the channel fd from 'fd' over all tracing session. When found, check
846 * for new channel stream and send those stream fds to the kernel consumer.
848 * Useful for CPU hotplug feature.
850 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
853 struct ltt_session
*session
;
854 struct ltt_kernel_session
*ksess
;
855 struct ltt_kernel_channel
*channel
;
857 DBG("Updating kernel streams for channel fd %d", fd
);
860 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
861 session_lock(session
);
862 if (session
->kernel_session
== NULL
) {
863 session_unlock(session
);
866 ksess
= session
->kernel_session
;
868 cds_list_for_each_entry(channel
,
869 &ksess
->channel_list
.head
, list
) {
870 struct lttng_ht_iter iter
;
871 struct consumer_socket
*socket
;
873 if (channel
->fd
!= fd
) {
876 DBG("Channel found, updating kernel streams");
877 ret
= kernel_open_channel_stream(channel
);
881 /* Update the stream global counter */
882 ksess
->stream_count_global
+= ret
;
885 * Have we already sent fds to the consumer? If yes, it
886 * means that tracing is started so it is safe to send
887 * our updated stream fds.
889 if (ksess
->consumer_fds_sent
!= 1
890 || ksess
->consumer
== NULL
) {
896 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
,
897 &iter
.iter
, socket
, node
.node
) {
898 pthread_mutex_lock(socket
->lock
);
899 ret
= kernel_consumer_send_channel_streams(socket
,
901 session
->output_traces
? 1 : 0);
902 pthread_mutex_unlock(socket
->lock
);
910 session_unlock(session
);
912 session_unlock_list();
916 session_unlock(session
);
917 session_unlock_list();
922 * For each tracing session, update newly registered apps. The session list
923 * lock MUST be acquired before calling this.
925 static void update_ust_app(int app_sock
)
927 struct ltt_session
*sess
, *stmp
;
929 /* Consumer is in an ERROR state. Stop any application update. */
930 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
931 /* Stop the update process since the consumer is dead. */
935 /* For all tracing session(s) */
936 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
940 if (!sess
->ust_session
) {
945 assert(app_sock
>= 0);
946 app
= ust_app_find_by_sock(app_sock
);
949 * Application can be unregistered before so
950 * this is possible hence simply stopping the
953 DBG3("UST app update failed to find app sock %d",
957 ust_app_global_update(sess
->ust_session
, app
);
961 session_unlock(sess
);
966 * This thread manage event coming from the kernel.
968 * Features supported in this thread:
971 static void *thread_manage_kernel(void *data
)
973 int ret
, i
, pollfd
, update_poll_flag
= 1, err
= -1;
974 uint32_t revents
, nb_fd
;
976 struct lttng_poll_event events
;
978 DBG("[thread] Thread manage kernel started");
980 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_KERNEL
);
983 * This first step of the while is to clean this structure which could free
984 * non NULL pointers so initialize it before the loop.
986 lttng_poll_init(&events
);
988 if (testpoint(sessiond_thread_manage_kernel
)) {
989 goto error_testpoint
;
992 health_code_update();
994 if (testpoint(sessiond_thread_manage_kernel_before_loop
)) {
995 goto error_testpoint
;
999 health_code_update();
1001 if (update_poll_flag
== 1) {
1002 /* Clean events object. We are about to populate it again. */
1003 lttng_poll_clean(&events
);
1005 ret
= sessiond_set_thread_pollset(&events
, 2);
1007 goto error_poll_create
;
1010 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
1015 /* This will add the available kernel channel if any. */
1016 ret
= update_kernel_poll(&events
);
1020 update_poll_flag
= 0;
1023 DBG("Thread kernel polling");
1025 /* Poll infinite value of time */
1027 health_poll_entry();
1028 ret
= lttng_poll_wait(&events
, -1);
1029 DBG("Thread kernel return from poll on %d fds",
1030 LTTNG_POLL_GETNB(&events
));
1034 * Restart interrupted system call.
1036 if (errno
== EINTR
) {
1040 } else if (ret
== 0) {
1041 /* Should not happen since timeout is infinite */
1042 ERR("Return value of poll is 0 with an infinite timeout.\n"
1043 "This should not have happened! Continuing...");
1049 for (i
= 0; i
< nb_fd
; i
++) {
1050 /* Fetch once the poll data */
1051 revents
= LTTNG_POLL_GETEV(&events
, i
);
1052 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1054 health_code_update();
1057 /* No activity for this FD (poll implementation). */
1061 /* Thread quit pipe has been closed. Killing thread. */
1062 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1068 /* Check for data on kernel pipe */
1069 if (revents
& LPOLLIN
) {
1070 if (pollfd
== kernel_poll_pipe
[0]) {
1071 (void) lttng_read(kernel_poll_pipe
[0],
1074 * Ret value is useless here, if this pipe gets any actions an
1075 * update is required anyway.
1077 update_poll_flag
= 1;
1081 * New CPU detected by the kernel. Adding kernel stream to
1082 * kernel session and updating the kernel consumer
1084 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
1090 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1091 update_poll_flag
= 1;
1094 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1102 lttng_poll_clean(&events
);
1105 utils_close_pipe(kernel_poll_pipe
);
1106 kernel_poll_pipe
[0] = kernel_poll_pipe
[1] = -1;
1109 ERR("Health error occurred in %s", __func__
);
1110 WARN("Kernel thread died unexpectedly. "
1111 "Kernel tracing can continue but CPU hotplug is disabled.");
1113 health_unregister(health_sessiond
);
1114 DBG("Kernel thread dying");
1119 * Signal pthread condition of the consumer data that the thread.
1121 static void signal_consumer_condition(struct consumer_data
*data
, int state
)
1123 pthread_mutex_lock(&data
->cond_mutex
);
1126 * The state is set before signaling. It can be any value, it's the waiter
1127 * job to correctly interpret this condition variable associated to the
1128 * consumer pthread_cond.
1130 * A value of 0 means that the corresponding thread of the consumer data
1131 * was not started. 1 indicates that the thread has started and is ready
1132 * for action. A negative value means that there was an error during the
1135 data
->consumer_thread_is_ready
= state
;
1136 (void) pthread_cond_signal(&data
->cond
);
1138 pthread_mutex_unlock(&data
->cond_mutex
);
1142 * This thread manage the consumer error sent back to the session daemon.
1144 static void *thread_manage_consumer(void *data
)
1146 int sock
= -1, i
, ret
, pollfd
, err
= -1, should_quit
= 0;
1147 uint32_t revents
, nb_fd
;
1148 enum lttcomm_return_code code
;
1149 struct lttng_poll_event events
;
1150 struct consumer_data
*consumer_data
= data
;
1151 struct consumer_socket
*cmd_socket_wrapper
= NULL
;
1153 DBG("[thread] Manage consumer started");
1155 rcu_register_thread();
1156 rcu_thread_online();
1158 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_CONSUMER
);
1160 health_code_update();
1163 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
1164 * metadata_sock. Nothing more will be added to this poll set.
1166 ret
= sessiond_set_thread_pollset(&events
, 3);
1172 * The error socket here is already in a listening state which was done
1173 * just before spawning this thread to avoid a race between the consumer
1174 * daemon exec trying to connect and the listen() call.
1176 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
1181 health_code_update();
1183 /* Infinite blocking call, waiting for transmission */
1185 health_poll_entry();
1187 if (testpoint(sessiond_thread_manage_consumer
)) {
1191 ret
= lttng_poll_wait(&events
, -1);
1195 * Restart interrupted system call.
1197 if (errno
== EINTR
) {
1205 for (i
= 0; i
< nb_fd
; i
++) {
1206 /* Fetch once the poll data */
1207 revents
= LTTNG_POLL_GETEV(&events
, i
);
1208 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1210 health_code_update();
1213 /* No activity for this FD (poll implementation). */
1217 /* Thread quit pipe has been closed. Killing thread. */
1218 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1224 /* Event on the registration socket */
1225 if (pollfd
== consumer_data
->err_sock
) {
1226 if (revents
& LPOLLIN
) {
1228 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1229 ERR("consumer err socket poll error");
1232 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1238 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
1244 * Set the CLOEXEC flag. Return code is useless because either way, the
1247 (void) utils_set_fd_cloexec(sock
);
1249 health_code_update();
1251 DBG2("Receiving code from consumer err_sock");
1253 /* Getting status code from kconsumerd */
1254 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1255 sizeof(enum lttcomm_return_code
));
1260 health_code_update();
1261 if (code
!= LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
) {
1262 ERR("consumer error when waiting for SOCK_READY : %s",
1263 lttcomm_get_readable_code(-code
));
1267 /* Connect both command and metadata sockets. */
1268 consumer_data
->cmd_sock
=
1269 lttcomm_connect_unix_sock(
1270 consumer_data
->cmd_unix_sock_path
);
1271 consumer_data
->metadata_fd
=
1272 lttcomm_connect_unix_sock(
1273 consumer_data
->cmd_unix_sock_path
);
1274 if (consumer_data
->cmd_sock
< 0 || consumer_data
->metadata_fd
< 0) {
1275 PERROR("consumer connect cmd socket");
1276 /* On error, signal condition and quit. */
1277 signal_consumer_condition(consumer_data
, -1);
1281 consumer_data
->metadata_sock
.fd_ptr
= &consumer_data
->metadata_fd
;
1283 /* Create metadata socket lock. */
1284 consumer_data
->metadata_sock
.lock
= zmalloc(sizeof(pthread_mutex_t
));
1285 if (consumer_data
->metadata_sock
.lock
== NULL
) {
1286 PERROR("zmalloc pthread mutex");
1289 pthread_mutex_init(consumer_data
->metadata_sock
.lock
, NULL
);
1291 DBG("Consumer command socket ready (fd: %d", consumer_data
->cmd_sock
);
1292 DBG("Consumer metadata socket ready (fd: %d)",
1293 consumer_data
->metadata_fd
);
1296 * Remove the consumerd error sock since we've established a connection.
1298 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1303 /* Add new accepted error socket. */
1304 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1309 /* Add metadata socket that is successfully connected. */
1310 ret
= lttng_poll_add(&events
, consumer_data
->metadata_fd
,
1311 LPOLLIN
| LPOLLRDHUP
);
1316 health_code_update();
1319 * Transfer the write-end of the channel monitoring and rotate pipe
1320 * to the consumer by issuing a SET_CHANNEL_MONITOR_PIPE and
1321 * SET_CHANNEL_ROTATE_PIPE commands.
1323 cmd_socket_wrapper
= consumer_allocate_socket(&consumer_data
->cmd_sock
);
1324 if (!cmd_socket_wrapper
) {
1327 cmd_socket_wrapper
->lock
= &consumer_data
->lock
;
1329 ret
= consumer_send_channel_monitor_pipe(cmd_socket_wrapper
,
1330 consumer_data
->channel_monitor_pipe
);
1335 ret
= consumer_send_channel_rotate_pipe(cmd_socket_wrapper
,
1336 consumer_data
->channel_rotate_pipe
);
1341 /* Discard the socket wrapper as it is no longer needed. */
1342 consumer_destroy_socket(cmd_socket_wrapper
);
1343 cmd_socket_wrapper
= NULL
;
1345 /* The thread is completely initialized, signal that it is ready. */
1346 signal_consumer_condition(consumer_data
, 1);
1348 /* Infinite blocking call, waiting for transmission */
1351 health_code_update();
1353 /* Exit the thread because the thread quit pipe has been triggered. */
1355 /* Not a health error. */
1360 health_poll_entry();
1361 ret
= lttng_poll_wait(&events
, -1);
1365 * Restart interrupted system call.
1367 if (errno
== EINTR
) {
1375 for (i
= 0; i
< nb_fd
; i
++) {
1376 /* Fetch once the poll data */
1377 revents
= LTTNG_POLL_GETEV(&events
, i
);
1378 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1380 health_code_update();
1383 /* No activity for this FD (poll implementation). */
1388 * Thread quit pipe has been triggered, flag that we should stop
1389 * but continue the current loop to handle potential data from
1392 should_quit
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1394 if (pollfd
== sock
) {
1395 /* Event on the consumerd socket */
1396 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)
1397 && !(revents
& LPOLLIN
)) {
1398 ERR("consumer err socket second poll error");
1401 health_code_update();
1402 /* Wait for any kconsumerd error */
1403 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1404 sizeof(enum lttcomm_return_code
));
1406 ERR("consumer closed the command socket");
1410 ERR("consumer return code : %s",
1411 lttcomm_get_readable_code(-code
));
1414 } else if (pollfd
== consumer_data
->metadata_fd
) {
1415 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)
1416 && !(revents
& LPOLLIN
)) {
1417 ERR("consumer err metadata socket second poll error");
1420 /* UST metadata requests */
1421 ret
= ust_consumer_metadata_request(
1422 &consumer_data
->metadata_sock
);
1424 ERR("Handling metadata request");
1428 /* No need for an else branch all FDs are tested prior. */
1430 health_code_update();
1436 * We lock here because we are about to close the sockets and some other
1437 * thread might be using them so get exclusive access which will abort all
1438 * other consumer command by other threads.
1440 pthread_mutex_lock(&consumer_data
->lock
);
1442 /* Immediately set the consumerd state to stopped */
1443 if (consumer_data
->type
== LTTNG_CONSUMER_KERNEL
) {
1444 uatomic_set(&kernel_consumerd_state
, CONSUMER_ERROR
);
1445 } else if (consumer_data
->type
== LTTNG_CONSUMER64_UST
||
1446 consumer_data
->type
== LTTNG_CONSUMER32_UST
) {
1447 uatomic_set(&ust_consumerd_state
, CONSUMER_ERROR
);
1449 /* Code flow error... */
1453 if (consumer_data
->err_sock
>= 0) {
1454 ret
= close(consumer_data
->err_sock
);
1458 consumer_data
->err_sock
= -1;
1460 if (consumer_data
->cmd_sock
>= 0) {
1461 ret
= close(consumer_data
->cmd_sock
);
1465 consumer_data
->cmd_sock
= -1;
1467 if (consumer_data
->metadata_sock
.fd_ptr
&&
1468 *consumer_data
->metadata_sock
.fd_ptr
>= 0) {
1469 ret
= close(*consumer_data
->metadata_sock
.fd_ptr
);
1481 unlink(consumer_data
->err_unix_sock_path
);
1482 unlink(consumer_data
->cmd_unix_sock_path
);
1483 pthread_mutex_unlock(&consumer_data
->lock
);
1485 /* Cleanup metadata socket mutex. */
1486 if (consumer_data
->metadata_sock
.lock
) {
1487 pthread_mutex_destroy(consumer_data
->metadata_sock
.lock
);
1488 free(consumer_data
->metadata_sock
.lock
);
1490 lttng_poll_clean(&events
);
1492 if (cmd_socket_wrapper
) {
1493 consumer_destroy_socket(cmd_socket_wrapper
);
1498 ERR("Health error occurred in %s", __func__
);
1500 health_unregister(health_sessiond
);
1501 DBG("consumer thread cleanup completed");
1503 rcu_thread_offline();
1504 rcu_unregister_thread();
1510 * This thread receives application command sockets (FDs) on the
1511 * apps_cmd_pipe and waits (polls) on them until they are closed
1512 * or an error occurs.
1514 * At that point, it flushes the data (tracing and metadata) associated
1515 * with this application and tears down ust app sessions and other
1516 * associated data structures through ust_app_unregister().
1518 * Note that this thread never sends commands to the applications
1519 * through the command sockets; it merely listens for hang-ups
1520 * and errors on those sockets and cleans-up as they occur.
1522 static void *thread_manage_apps(void *data
)
1524 int i
, ret
, pollfd
, err
= -1;
1526 uint32_t revents
, nb_fd
;
1527 struct lttng_poll_event events
;
1529 DBG("[thread] Manage application started");
1531 rcu_register_thread();
1532 rcu_thread_online();
1534 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_MANAGE
);
1536 if (testpoint(sessiond_thread_manage_apps
)) {
1537 goto error_testpoint
;
1540 health_code_update();
1542 ret
= sessiond_set_thread_pollset(&events
, 2);
1544 goto error_poll_create
;
1547 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1552 if (testpoint(sessiond_thread_manage_apps_before_loop
)) {
1556 health_code_update();
1559 DBG("Apps thread polling");
1561 /* Inifinite blocking call, waiting for transmission */
1563 health_poll_entry();
1564 ret
= lttng_poll_wait(&events
, -1);
1565 DBG("Apps thread return from poll on %d fds",
1566 LTTNG_POLL_GETNB(&events
));
1570 * Restart interrupted system call.
1572 if (errno
== EINTR
) {
1580 for (i
= 0; i
< nb_fd
; i
++) {
1581 /* Fetch once the poll data */
1582 revents
= LTTNG_POLL_GETEV(&events
, i
);
1583 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1585 health_code_update();
1588 /* No activity for this FD (poll implementation). */
1592 /* Thread quit pipe has been closed. Killing thread. */
1593 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1599 /* Inspect the apps cmd pipe */
1600 if (pollfd
== apps_cmd_pipe
[0]) {
1601 if (revents
& LPOLLIN
) {
1605 size_ret
= lttng_read(apps_cmd_pipe
[0], &sock
, sizeof(sock
));
1606 if (size_ret
< sizeof(sock
)) {
1607 PERROR("read apps cmd pipe");
1611 health_code_update();
1614 * Since this is a command socket (write then read),
1615 * we only monitor the error events of the socket.
1617 ret
= lttng_poll_add(&events
, sock
,
1618 LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
);
1623 DBG("Apps with sock %d added to poll set", sock
);
1624 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1625 ERR("Apps command pipe error");
1628 ERR("Unknown poll events %u for sock %d", revents
, pollfd
);
1633 * At this point, we know that a registered application made
1634 * the event at poll_wait.
1636 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1637 /* Removing from the poll set */
1638 ret
= lttng_poll_del(&events
, pollfd
);
1643 /* Socket closed on remote end. */
1644 ust_app_unregister(pollfd
);
1646 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1651 health_code_update();
1657 lttng_poll_clean(&events
);
1660 utils_close_pipe(apps_cmd_pipe
);
1661 apps_cmd_pipe
[0] = apps_cmd_pipe
[1] = -1;
1664 * We don't clean the UST app hash table here since already registered
1665 * applications can still be controlled so let them be until the session
1666 * daemon dies or the applications stop.
1671 ERR("Health error occurred in %s", __func__
);
1673 health_unregister(health_sessiond
);
1674 DBG("Application communication apps thread cleanup complete");
1675 rcu_thread_offline();
1676 rcu_unregister_thread();
1681 * Send a socket to a thread This is called from the dispatch UST registration
1682 * thread once all sockets are set for the application.
1684 * The sock value can be invalid, we don't really care, the thread will handle
1685 * it and make the necessary cleanup if so.
1687 * On success, return 0 else a negative value being the errno message of the
1690 static int send_socket_to_thread(int fd
, int sock
)
1695 * It's possible that the FD is set as invalid with -1 concurrently just
1696 * before calling this function being a shutdown state of the thread.
1703 ret
= lttng_write(fd
, &sock
, sizeof(sock
));
1704 if (ret
< sizeof(sock
)) {
1705 PERROR("write apps pipe %d", fd
);
1712 /* All good. Don't send back the write positive ret value. */
1719 * Sanitize the wait queue of the dispatch registration thread meaning removing
1720 * invalid nodes from it. This is to avoid memory leaks for the case the UST
1721 * notify socket is never received.
1723 static void sanitize_wait_queue(struct ust_reg_wait_queue
*wait_queue
)
1725 int ret
, nb_fd
= 0, i
;
1726 unsigned int fd_added
= 0;
1727 struct lttng_poll_event events
;
1728 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1732 lttng_poll_init(&events
);
1734 /* Just skip everything for an empty queue. */
1735 if (!wait_queue
->count
) {
1739 ret
= lttng_poll_create(&events
, wait_queue
->count
, LTTNG_CLOEXEC
);
1744 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1745 &wait_queue
->head
, head
) {
1746 assert(wait_node
->app
);
1747 ret
= lttng_poll_add(&events
, wait_node
->app
->sock
,
1748 LPOLLHUP
| LPOLLERR
);
1761 * Poll but don't block so we can quickly identify the faulty events and
1762 * clean them afterwards from the wait queue.
1764 ret
= lttng_poll_wait(&events
, 0);
1770 for (i
= 0; i
< nb_fd
; i
++) {
1771 /* Get faulty FD. */
1772 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1773 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1776 /* No activity for this FD (poll implementation). */
1780 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1781 &wait_queue
->head
, head
) {
1782 if (pollfd
== wait_node
->app
->sock
&&
1783 (revents
& (LPOLLHUP
| LPOLLERR
))) {
1784 cds_list_del(&wait_node
->head
);
1785 wait_queue
->count
--;
1786 ust_app_destroy(wait_node
->app
);
1789 * Silence warning of use-after-free in
1790 * cds_list_for_each_entry_safe which uses
1791 * __typeof__(*wait_node).
1796 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1803 DBG("Wait queue sanitized, %d node were cleaned up", nb_fd
);
1807 lttng_poll_clean(&events
);
1811 lttng_poll_clean(&events
);
1813 ERR("Unable to sanitize wait queue");
1818 * Dispatch request from the registration threads to the application
1819 * communication thread.
1821 static void *thread_dispatch_ust_registration(void *data
)
1824 struct cds_wfcq_node
*node
;
1825 struct ust_command
*ust_cmd
= NULL
;
1826 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1827 struct ust_reg_wait_queue wait_queue
= {
1831 rcu_register_thread();
1833 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH
);
1835 if (testpoint(sessiond_thread_app_reg_dispatch
)) {
1836 goto error_testpoint
;
1839 health_code_update();
1841 CDS_INIT_LIST_HEAD(&wait_queue
.head
);
1843 DBG("[thread] Dispatch UST command started");
1846 health_code_update();
1848 /* Atomically prepare the queue futex */
1849 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1851 if (CMM_LOAD_SHARED(dispatch_thread_exit
)) {
1856 struct ust_app
*app
= NULL
;
1860 * Make sure we don't have node(s) that have hung up before receiving
1861 * the notify socket. This is to clean the list in order to avoid
1862 * memory leaks from notify socket that are never seen.
1864 sanitize_wait_queue(&wait_queue
);
1866 health_code_update();
1867 /* Dequeue command for registration */
1868 node
= cds_wfcq_dequeue_blocking(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
);
1870 DBG("Woken up but nothing in the UST command queue");
1871 /* Continue thread execution */
1875 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1877 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1878 " gid:%d sock:%d name:%s (version %d.%d)",
1879 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1880 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1881 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1882 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1884 if (ust_cmd
->reg_msg
.type
== USTCTL_SOCKET_CMD
) {
1885 wait_node
= zmalloc(sizeof(*wait_node
));
1887 PERROR("zmalloc wait_node dispatch");
1888 ret
= close(ust_cmd
->sock
);
1890 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1892 lttng_fd_put(LTTNG_FD_APPS
, 1);
1896 CDS_INIT_LIST_HEAD(&wait_node
->head
);
1898 /* Create application object if socket is CMD. */
1899 wait_node
->app
= ust_app_create(&ust_cmd
->reg_msg
,
1901 if (!wait_node
->app
) {
1902 ret
= close(ust_cmd
->sock
);
1904 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1906 lttng_fd_put(LTTNG_FD_APPS
, 1);
1912 * Add application to the wait queue so we can set the notify
1913 * socket before putting this object in the global ht.
1915 cds_list_add(&wait_node
->head
, &wait_queue
.head
);
1920 * We have to continue here since we don't have the notify
1921 * socket and the application MUST be added to the hash table
1922 * only at that moment.
1927 * Look for the application in the local wait queue and set the
1928 * notify socket if found.
1930 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1931 &wait_queue
.head
, head
) {
1932 health_code_update();
1933 if (wait_node
->app
->pid
== ust_cmd
->reg_msg
.pid
) {
1934 wait_node
->app
->notify_sock
= ust_cmd
->sock
;
1935 cds_list_del(&wait_node
->head
);
1937 app
= wait_node
->app
;
1939 DBG3("UST app notify socket %d is set", ust_cmd
->sock
);
1945 * With no application at this stage the received socket is
1946 * basically useless so close it before we free the cmd data
1947 * structure for good.
1950 ret
= close(ust_cmd
->sock
);
1952 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1954 lttng_fd_put(LTTNG_FD_APPS
, 1);
1961 * @session_lock_list
1963 * Lock the global session list so from the register up to the
1964 * registration done message, no thread can see the application
1965 * and change its state.
1967 session_lock_list();
1971 * Add application to the global hash table. This needs to be
1972 * done before the update to the UST registry can locate the
1977 /* Set app version. This call will print an error if needed. */
1978 (void) ust_app_version(app
);
1980 /* Send notify socket through the notify pipe. */
1981 ret
= send_socket_to_thread(apps_cmd_notify_pipe
[1],
1985 session_unlock_list();
1987 * No notify thread, stop the UST tracing. However, this is
1988 * not an internal error of the this thread thus setting
1989 * the health error code to a normal exit.
1996 * Update newly registered application with the tracing
1997 * registry info already enabled information.
1999 update_ust_app(app
->sock
);
2002 * Don't care about return value. Let the manage apps threads
2003 * handle app unregistration upon socket close.
2005 (void) ust_app_register_done(app
);
2008 * Even if the application socket has been closed, send the app
2009 * to the thread and unregistration will take place at that
2012 ret
= send_socket_to_thread(apps_cmd_pipe
[1], app
->sock
);
2015 session_unlock_list();
2017 * No apps. thread, stop the UST tracing. However, this is
2018 * not an internal error of the this thread thus setting
2019 * the health error code to a normal exit.
2026 session_unlock_list();
2028 } while (node
!= NULL
);
2030 health_poll_entry();
2031 /* Futex wait on queue. Blocking call on futex() */
2032 futex_nto1_wait(&ust_cmd_queue
.futex
);
2035 /* Normal exit, no error */
2039 /* Clean up wait queue. */
2040 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
2041 &wait_queue
.head
, head
) {
2042 cds_list_del(&wait_node
->head
);
2047 /* Empty command queue. */
2049 /* Dequeue command for registration */
2050 node
= cds_wfcq_dequeue_blocking(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
);
2054 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
2055 ret
= close(ust_cmd
->sock
);
2057 PERROR("close ust sock exit dispatch %d", ust_cmd
->sock
);
2059 lttng_fd_put(LTTNG_FD_APPS
, 1);
2064 DBG("Dispatch thread dying");
2067 ERR("Health error occurred in %s", __func__
);
2069 health_unregister(health_sessiond
);
2070 rcu_unregister_thread();
2075 * This thread manage application registration.
2077 static void *thread_registration_apps(void *data
)
2079 int sock
= -1, i
, ret
, pollfd
, err
= -1;
2080 uint32_t revents
, nb_fd
;
2081 struct lttng_poll_event events
;
2083 * Get allocated in this thread, enqueued to a global queue, dequeued and
2084 * freed in the manage apps thread.
2086 struct ust_command
*ust_cmd
= NULL
;
2088 DBG("[thread] Manage application registration started");
2090 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_REG
);
2092 if (testpoint(sessiond_thread_registration_apps
)) {
2093 goto error_testpoint
;
2096 ret
= lttcomm_listen_unix_sock(apps_sock
);
2102 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
2103 * more will be added to this poll set.
2105 ret
= sessiond_set_thread_pollset(&events
, 2);
2107 goto error_create_poll
;
2110 /* Add the application registration socket */
2111 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
2113 goto error_poll_add
;
2116 /* Notify all applications to register */
2117 ret
= notify_ust_apps(1);
2119 ERR("Failed to notify applications or create the wait shared memory.\n"
2120 "Execution continues but there might be problem for already\n"
2121 "running applications that wishes to register.");
2125 DBG("Accepting application registration");
2127 /* Inifinite blocking call, waiting for transmission */
2129 health_poll_entry();
2130 ret
= lttng_poll_wait(&events
, -1);
2134 * Restart interrupted system call.
2136 if (errno
== EINTR
) {
2144 for (i
= 0; i
< nb_fd
; i
++) {
2145 health_code_update();
2147 /* Fetch once the poll data */
2148 revents
= LTTNG_POLL_GETEV(&events
, i
);
2149 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2152 /* No activity for this FD (poll implementation). */
2156 /* Thread quit pipe has been closed. Killing thread. */
2157 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
2163 /* Event on the registration socket */
2164 if (pollfd
== apps_sock
) {
2165 if (revents
& LPOLLIN
) {
2166 sock
= lttcomm_accept_unix_sock(apps_sock
);
2172 * Set socket timeout for both receiving and ending.
2173 * app_socket_timeout is in seconds, whereas
2174 * lttcomm_setsockopt_rcv_timeout and
2175 * lttcomm_setsockopt_snd_timeout expect msec as
2178 if (config
.app_socket_timeout
>= 0) {
2179 (void) lttcomm_setsockopt_rcv_timeout(sock
,
2180 config
.app_socket_timeout
* 1000);
2181 (void) lttcomm_setsockopt_snd_timeout(sock
,
2182 config
.app_socket_timeout
* 1000);
2186 * Set the CLOEXEC flag. Return code is useless because
2187 * either way, the show must go on.
2189 (void) utils_set_fd_cloexec(sock
);
2191 /* Create UST registration command for enqueuing */
2192 ust_cmd
= zmalloc(sizeof(struct ust_command
));
2193 if (ust_cmd
== NULL
) {
2194 PERROR("ust command zmalloc");
2203 * Using message-based transmissions to ensure we don't
2204 * have to deal with partially received messages.
2206 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2208 ERR("Exhausted file descriptors allowed for applications.");
2218 health_code_update();
2219 ret
= ust_app_recv_registration(sock
, &ust_cmd
->reg_msg
);
2222 /* Close socket of the application. */
2227 lttng_fd_put(LTTNG_FD_APPS
, 1);
2231 health_code_update();
2233 ust_cmd
->sock
= sock
;
2236 DBG("UST registration received with pid:%d ppid:%d uid:%d"
2237 " gid:%d sock:%d name:%s (version %d.%d)",
2238 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
2239 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
2240 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
2241 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
2244 * Lock free enqueue the registration request. The red pill
2245 * has been taken! This apps will be part of the *system*.
2247 cds_wfcq_enqueue(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
, &ust_cmd
->node
);
2250 * Wake the registration queue futex. Implicit memory
2251 * barrier with the exchange in cds_wfcq_enqueue.
2253 futex_nto1_wake(&ust_cmd_queue
.futex
);
2254 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2255 ERR("Register apps socket poll error");
2258 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
2267 /* Notify that the registration thread is gone */
2270 if (apps_sock
>= 0) {
2271 ret
= close(apps_sock
);
2281 lttng_fd_put(LTTNG_FD_APPS
, 1);
2283 unlink(config
.apps_unix_sock_path
.value
);
2286 lttng_poll_clean(&events
);
2290 DBG("UST Registration thread cleanup complete");
2293 ERR("Health error occurred in %s", __func__
);
2295 health_unregister(health_sessiond
);
2301 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
2302 * exec or it will fails.
2304 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
2307 struct timespec timeout
;
2310 * Make sure we set the readiness flag to 0 because we are NOT ready.
2311 * This access to consumer_thread_is_ready does not need to be
2312 * protected by consumer_data.cond_mutex (yet) since the consumer
2313 * management thread has not been started at this point.
2315 consumer_data
->consumer_thread_is_ready
= 0;
2317 /* Setup pthread condition */
2318 ret
= pthread_condattr_init(&consumer_data
->condattr
);
2321 PERROR("pthread_condattr_init consumer data");
2326 * Set the monotonic clock in order to make sure we DO NOT jump in time
2327 * between the clock_gettime() call and the timedwait call. See bug #324
2328 * for a more details and how we noticed it.
2330 ret
= pthread_condattr_setclock(&consumer_data
->condattr
, CLOCK_MONOTONIC
);
2333 PERROR("pthread_condattr_setclock consumer data");
2337 ret
= pthread_cond_init(&consumer_data
->cond
, &consumer_data
->condattr
);
2340 PERROR("pthread_cond_init consumer data");
2344 ret
= pthread_create(&consumer_data
->thread
, default_pthread_attr(),
2345 thread_manage_consumer
, consumer_data
);
2348 PERROR("pthread_create consumer");
2353 /* We are about to wait on a pthread condition */
2354 pthread_mutex_lock(&consumer_data
->cond_mutex
);
2356 /* Get time for sem_timedwait absolute timeout */
2357 clock_ret
= lttng_clock_gettime(CLOCK_MONOTONIC
, &timeout
);
2359 * Set the timeout for the condition timed wait even if the clock gettime
2360 * call fails since we might loop on that call and we want to avoid to
2361 * increment the timeout too many times.
2363 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
2366 * The following loop COULD be skipped in some conditions so this is why we
2367 * set ret to 0 in order to make sure at least one round of the loop is
2373 * Loop until the condition is reached or when a timeout is reached. Note
2374 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
2375 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
2376 * possible. This loop does not take any chances and works with both of
2379 while (!consumer_data
->consumer_thread_is_ready
&& ret
!= ETIMEDOUT
) {
2380 if (clock_ret
< 0) {
2381 PERROR("clock_gettime spawn consumer");
2382 /* Infinite wait for the consumerd thread to be ready */
2383 ret
= pthread_cond_wait(&consumer_data
->cond
,
2384 &consumer_data
->cond_mutex
);
2386 ret
= pthread_cond_timedwait(&consumer_data
->cond
,
2387 &consumer_data
->cond_mutex
, &timeout
);
2391 /* Release the pthread condition */
2392 pthread_mutex_unlock(&consumer_data
->cond_mutex
);
2396 if (ret
== ETIMEDOUT
) {
2400 * Call has timed out so we kill the kconsumerd_thread and return
2403 ERR("Condition timed out. The consumer thread was never ready."
2405 pth_ret
= pthread_cancel(consumer_data
->thread
);
2407 PERROR("pthread_cancel consumer thread");
2410 PERROR("pthread_cond_wait failed consumer thread");
2412 /* Caller is expecting a negative value on failure. */
2417 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2418 if (consumer_data
->pid
== 0) {
2419 ERR("Consumerd did not start");
2420 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2423 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2432 * Join consumer thread
2434 static int join_consumer_thread(struct consumer_data
*consumer_data
)
2438 /* Consumer pid must be a real one. */
2439 if (consumer_data
->pid
> 0) {
2441 ret
= kill(consumer_data
->pid
, SIGTERM
);
2443 PERROR("Error killing consumer daemon");
2446 return pthread_join(consumer_data
->thread
, &status
);
2453 * Fork and exec a consumer daemon (consumerd).
2455 * Return pid if successful else -1.
2457 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
2461 const char *consumer_to_use
;
2462 const char *verbosity
;
2465 DBG("Spawning consumerd");
2472 if (config
.verbose_consumer
) {
2473 verbosity
= "--verbose";
2474 } else if (lttng_opt_quiet
) {
2475 verbosity
= "--quiet";
2480 switch (consumer_data
->type
) {
2481 case LTTNG_CONSUMER_KERNEL
:
2483 * Find out which consumerd to execute. We will first try the
2484 * 64-bit path, then the sessiond's installation directory, and
2485 * fallback on the 32-bit one,
2487 DBG3("Looking for a kernel consumer at these locations:");
2488 DBG3(" 1) %s", config
.consumerd64_bin_path
.value
? : "NULL");
2489 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, DEFAULT_CONSUMERD_FILE
);
2490 DBG3(" 3) %s", config
.consumerd32_bin_path
.value
? : "NULL");
2491 if (stat(config
.consumerd64_bin_path
.value
, &st
) == 0) {
2492 DBG3("Found location #1");
2493 consumer_to_use
= config
.consumerd64_bin_path
.value
;
2494 } else if (stat(INSTALL_BIN_PATH
"/" DEFAULT_CONSUMERD_FILE
, &st
) == 0) {
2495 DBG3("Found location #2");
2496 consumer_to_use
= INSTALL_BIN_PATH
"/" DEFAULT_CONSUMERD_FILE
;
2497 } else if (stat(config
.consumerd32_bin_path
.value
, &st
) == 0) {
2498 DBG3("Found location #3");
2499 consumer_to_use
= config
.consumerd32_bin_path
.value
;
2501 DBG("Could not find any valid consumerd executable");
2505 DBG("Using kernel consumer at: %s", consumer_to_use
);
2506 (void) execl(consumer_to_use
,
2507 "lttng-consumerd", verbosity
, "-k",
2508 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2509 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2510 "--group", config
.tracing_group_name
.value
,
2513 case LTTNG_CONSUMER64_UST
:
2515 if (config
.consumerd64_lib_dir
.value
) {
2520 tmp
= lttng_secure_getenv("LD_LIBRARY_PATH");
2524 tmplen
= strlen(config
.consumerd64_lib_dir
.value
) + 1 /* : */ + strlen(tmp
);
2525 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2530 strcat(tmpnew
, config
.consumerd64_lib_dir
.value
);
2531 if (tmp
[0] != '\0') {
2532 strcat(tmpnew
, ":");
2533 strcat(tmpnew
, tmp
);
2535 ret
= setenv("LD_LIBRARY_PATH", tmpnew
, 1);
2542 DBG("Using 64-bit UST consumer at: %s", config
.consumerd64_bin_path
.value
);
2543 (void) execl(config
.consumerd64_bin_path
.value
, "lttng-consumerd", verbosity
, "-u",
2544 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2545 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2546 "--group", config
.tracing_group_name
.value
,
2550 case LTTNG_CONSUMER32_UST
:
2552 if (config
.consumerd32_lib_dir
.value
) {
2557 tmp
= lttng_secure_getenv("LD_LIBRARY_PATH");
2561 tmplen
= strlen(config
.consumerd32_lib_dir
.value
) + 1 /* : */ + strlen(tmp
);
2562 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2567 strcat(tmpnew
, config
.consumerd32_lib_dir
.value
);
2568 if (tmp
[0] != '\0') {
2569 strcat(tmpnew
, ":");
2570 strcat(tmpnew
, tmp
);
2572 ret
= setenv("LD_LIBRARY_PATH", tmpnew
, 1);
2579 DBG("Using 32-bit UST consumer at: %s", config
.consumerd32_bin_path
.value
);
2580 (void) execl(config
.consumerd32_bin_path
.value
, "lttng-consumerd", verbosity
, "-u",
2581 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2582 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2583 "--group", config
.tracing_group_name
.value
,
2588 ERR("unknown consumer type");
2592 PERROR("Consumer execl()");
2594 /* Reaching this point, we got a failure on our execl(). */
2596 } else if (pid
> 0) {
2599 PERROR("start consumer fork");
2607 * Spawn the consumerd daemon and session daemon thread.
2609 static int start_consumerd(struct consumer_data
*consumer_data
)
2614 * Set the listen() state on the socket since there is a possible race
2615 * between the exec() of the consumer daemon and this call if place in the
2616 * consumer thread. See bug #366 for more details.
2618 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
2623 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2624 if (consumer_data
->pid
!= 0) {
2625 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2629 ret
= spawn_consumerd(consumer_data
);
2631 ERR("Spawning consumerd failed");
2632 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2636 /* Setting up the consumer_data pid */
2637 consumer_data
->pid
= ret
;
2638 DBG2("Consumer pid %d", consumer_data
->pid
);
2639 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2641 DBG2("Spawning consumer control thread");
2642 ret
= spawn_consumer_thread(consumer_data
);
2644 ERR("Fatal error spawning consumer control thread");
2652 /* Cleanup already created sockets on error. */
2653 if (consumer_data
->err_sock
>= 0) {
2656 err
= close(consumer_data
->err_sock
);
2658 PERROR("close consumer data error socket");
2665 * Setup necessary data for kernel tracer action.
2667 static int init_kernel_tracer(void)
2671 /* Modprobe lttng kernel modules */
2672 ret
= modprobe_lttng_control();
2677 /* Open debugfs lttng */
2678 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
2679 if (kernel_tracer_fd
< 0) {
2680 DBG("Failed to open %s", module_proc_lttng
);
2684 /* Validate kernel version */
2685 ret
= kernel_validate_version(kernel_tracer_fd
, &kernel_tracer_version
,
2686 &kernel_tracer_abi_version
);
2691 ret
= modprobe_lttng_data();
2696 ret
= kernel_supports_ring_buffer_snapshot_sample_positions(
2703 WARN("Kernel tracer does not support buffer monitoring. "
2704 "The monitoring timer of channels in the kernel domain "
2705 "will be set to 0 (disabled).");
2708 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
2712 modprobe_remove_lttng_control();
2713 ret
= close(kernel_tracer_fd
);
2717 kernel_tracer_fd
= -1;
2718 return LTTNG_ERR_KERN_VERSION
;
2721 ret
= close(kernel_tracer_fd
);
2727 modprobe_remove_lttng_control();
2730 WARN("No kernel tracer available");
2731 kernel_tracer_fd
= -1;
2733 return LTTNG_ERR_NEED_ROOT_SESSIOND
;
2735 return LTTNG_ERR_KERN_NA
;
2741 * Copy consumer output from the tracing session to the domain session. The
2742 * function also applies the right modification on a per domain basis for the
2743 * trace files destination directory.
2745 * Should *NOT* be called with RCU read-side lock held.
2747 static int copy_session_consumer(int domain
, struct ltt_session
*session
)
2750 const char *dir_name
;
2751 struct consumer_output
*consumer
;
2754 assert(session
->consumer
);
2757 case LTTNG_DOMAIN_KERNEL
:
2758 DBG3("Copying tracing session consumer output in kernel session");
2760 * XXX: We should audit the session creation and what this function
2761 * does "extra" in order to avoid a destroy since this function is used
2762 * in the domain session creation (kernel and ust) only. Same for UST
2765 if (session
->kernel_session
->consumer
) {
2766 consumer_output_put(session
->kernel_session
->consumer
);
2768 session
->kernel_session
->consumer
=
2769 consumer_copy_output(session
->consumer
);
2770 /* Ease our life a bit for the next part */
2771 consumer
= session
->kernel_session
->consumer
;
2772 dir_name
= DEFAULT_KERNEL_TRACE_DIR
;
2774 case LTTNG_DOMAIN_JUL
:
2775 case LTTNG_DOMAIN_LOG4J
:
2776 case LTTNG_DOMAIN_PYTHON
:
2777 case LTTNG_DOMAIN_UST
:
2778 DBG3("Copying tracing session consumer output in UST session");
2779 if (session
->ust_session
->consumer
) {
2780 consumer_output_put(session
->ust_session
->consumer
);
2782 session
->ust_session
->consumer
=
2783 consumer_copy_output(session
->consumer
);
2784 /* Ease our life a bit for the next part */
2785 consumer
= session
->ust_session
->consumer
;
2786 dir_name
= DEFAULT_UST_TRACE_DIR
;
2789 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2793 /* Append correct directory to subdir */
2794 strncat(consumer
->subdir
, dir_name
,
2795 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
2796 DBG3("Copy session consumer subdir %s", consumer
->subdir
);
2805 * Create an UST session and add it to the session ust list.
2807 * Should *NOT* be called with RCU read-side lock held.
2809 static int create_ust_session(struct ltt_session
*session
,
2810 struct lttng_domain
*domain
)
2813 struct ltt_ust_session
*lus
= NULL
;
2817 assert(session
->consumer
);
2819 switch (domain
->type
) {
2820 case LTTNG_DOMAIN_JUL
:
2821 case LTTNG_DOMAIN_LOG4J
:
2822 case LTTNG_DOMAIN_PYTHON
:
2823 case LTTNG_DOMAIN_UST
:
2826 ERR("Unknown UST domain on create session %d", domain
->type
);
2827 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2831 DBG("Creating UST session");
2833 lus
= trace_ust_create_session(session
->id
);
2835 ret
= LTTNG_ERR_UST_SESS_FAIL
;
2839 lus
->uid
= session
->uid
;
2840 lus
->gid
= session
->gid
;
2841 lus
->output_traces
= session
->output_traces
;
2842 lus
->snapshot_mode
= session
->snapshot_mode
;
2843 lus
->live_timer_interval
= session
->live_timer
;
2844 session
->ust_session
= lus
;
2845 if (session
->shm_path
[0]) {
2846 strncpy(lus
->root_shm_path
, session
->shm_path
,
2847 sizeof(lus
->root_shm_path
));
2848 lus
->root_shm_path
[sizeof(lus
->root_shm_path
) - 1] = '\0';
2849 strncpy(lus
->shm_path
, session
->shm_path
,
2850 sizeof(lus
->shm_path
));
2851 lus
->shm_path
[sizeof(lus
->shm_path
) - 1] = '\0';
2852 strncat(lus
->shm_path
, "/ust",
2853 sizeof(lus
->shm_path
) - strlen(lus
->shm_path
) - 1);
2855 /* Copy session output to the newly created UST session */
2856 ret
= copy_session_consumer(domain
->type
, session
);
2857 if (ret
!= LTTNG_OK
) {
2865 session
->ust_session
= NULL
;
2870 * Create a kernel tracer session then create the default channel.
2872 static int create_kernel_session(struct ltt_session
*session
)
2876 DBG("Creating kernel session");
2878 ret
= kernel_create_session(session
, kernel_tracer_fd
);
2880 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2884 /* Code flow safety */
2885 assert(session
->kernel_session
);
2887 /* Copy session output to the newly created Kernel session */
2888 ret
= copy_session_consumer(LTTNG_DOMAIN_KERNEL
, session
);
2889 if (ret
!= LTTNG_OK
) {
2893 session
->kernel_session
->uid
= session
->uid
;
2894 session
->kernel_session
->gid
= session
->gid
;
2895 session
->kernel_session
->output_traces
= session
->output_traces
;
2896 session
->kernel_session
->snapshot_mode
= session
->snapshot_mode
;
2901 trace_kernel_destroy_session(session
->kernel_session
);
2902 session
->kernel_session
= NULL
;
2907 * Count number of session permitted by uid/gid.
2909 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2912 struct ltt_session
*session
;
2914 DBG("Counting number of available session for UID %d GID %d",
2916 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2918 * Only list the sessions the user can control.
2920 if (!session_access_ok(session
, uid
, gid
)) {
2929 * Check if the current kernel tracer supports the session rotation feature.
2930 * Return 1 if it does, 0 otherwise.
2932 static int check_rotate_compatible(void)
2936 if (kernel_tracer_version
.major
!= 2 || kernel_tracer_version
.minor
< 11) {
2937 DBG("Kernel tracer version is not compatible with the rotation feature");
2945 * Process the command requested by the lttng client within the command
2946 * context structure. This function make sure that the return structure (llm)
2947 * is set and ready for transmission before returning.
2949 * Return any error encountered or 0 for success.
2951 * "sock" is only used for special-case var. len data.
2953 * Should *NOT* be called with RCU read-side lock held.
2955 static int process_client_msg(struct command_ctx
*cmd_ctx
, int sock
,
2959 int need_tracing_session
= 1;
2962 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2964 assert(!rcu_read_ongoing());
2968 switch (cmd_ctx
->lsm
->cmd_type
) {
2969 case LTTNG_CREATE_SESSION
:
2970 case LTTNG_CREATE_SESSION_SNAPSHOT
:
2971 case LTTNG_CREATE_SESSION_LIVE
:
2972 case LTTNG_DESTROY_SESSION
:
2973 case LTTNG_LIST_SESSIONS
:
2974 case LTTNG_LIST_DOMAINS
:
2975 case LTTNG_START_TRACE
:
2976 case LTTNG_STOP_TRACE
:
2977 case LTTNG_DATA_PENDING
:
2978 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
2979 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
2980 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
2981 case LTTNG_SNAPSHOT_RECORD
:
2982 case LTTNG_SAVE_SESSION
:
2983 case LTTNG_SET_SESSION_SHM_PATH
:
2984 case LTTNG_REGENERATE_METADATA
:
2985 case LTTNG_REGENERATE_STATEDUMP
:
2986 case LTTNG_REGISTER_TRIGGER
:
2987 case LTTNG_UNREGISTER_TRIGGER
:
2988 case LTTNG_ROTATE_SESSION
:
2989 case LTTNG_ROTATION_GET_INFO
:
2990 case LTTNG_SESSION_GET_CURRENT_OUTPUT
:
2991 case LTTNG_ROTATION_SET_SCHEDULE
:
2992 case LTTNG_ROTATION_SCHEDULE_GET_TIMER_PERIOD
:
2993 case LTTNG_ROTATION_SCHEDULE_GET_SIZE
:
3000 if (config
.no_kernel
&& need_domain
3001 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
3003 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
3005 ret
= LTTNG_ERR_KERN_NA
;
3010 /* Deny register consumer if we already have a spawned consumer. */
3011 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_REGISTER_CONSUMER
) {
3012 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3013 if (kconsumer_data
.pid
> 0) {
3014 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
3015 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3018 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3022 * Check for command that don't needs to allocate a returned payload. We do
3023 * this here so we don't have to make the call for no payload at each
3026 switch(cmd_ctx
->lsm
->cmd_type
) {
3027 case LTTNG_LIST_SESSIONS
:
3028 case LTTNG_LIST_TRACEPOINTS
:
3029 case LTTNG_LIST_TRACEPOINT_FIELDS
:
3030 case LTTNG_LIST_DOMAINS
:
3031 case LTTNG_LIST_CHANNELS
:
3032 case LTTNG_LIST_EVENTS
:
3033 case LTTNG_LIST_SYSCALLS
:
3034 case LTTNG_LIST_TRACKER_PIDS
:
3035 case LTTNG_DATA_PENDING
:
3036 case LTTNG_ROTATE_SESSION
:
3037 case LTTNG_ROTATION_GET_INFO
:
3038 case LTTNG_ROTATION_SCHEDULE_GET_TIMER_PERIOD
:
3039 case LTTNG_ROTATION_SCHEDULE_GET_SIZE
:
3042 /* Setup lttng message with no payload */
3043 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, NULL
, 0);
3045 /* This label does not try to unlock the session */
3046 goto init_setup_error
;
3050 /* Commands that DO NOT need a session. */
3051 switch (cmd_ctx
->lsm
->cmd_type
) {
3052 case LTTNG_CREATE_SESSION
:
3053 case LTTNG_CREATE_SESSION_SNAPSHOT
:
3054 case LTTNG_CREATE_SESSION_LIVE
:
3055 case LTTNG_LIST_SESSIONS
:
3056 case LTTNG_LIST_TRACEPOINTS
:
3057 case LTTNG_LIST_SYSCALLS
:
3058 case LTTNG_LIST_TRACEPOINT_FIELDS
:
3059 case LTTNG_SAVE_SESSION
:
3060 case LTTNG_REGISTER_TRIGGER
:
3061 case LTTNG_UNREGISTER_TRIGGER
:
3062 need_tracing_session
= 0;
3065 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
3067 * We keep the session list lock across _all_ commands
3068 * for now, because the per-session lock does not
3069 * handle teardown properly.
3071 session_lock_list();
3072 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
3073 if (cmd_ctx
->session
== NULL
) {
3074 ret
= LTTNG_ERR_SESS_NOT_FOUND
;
3077 /* Acquire lock for the session */
3078 session_lock(cmd_ctx
->session
);
3084 * Commands that need a valid session but should NOT create one if none
3085 * exists. Instead of creating one and destroying it when the command is
3086 * handled, process that right before so we save some round trip in useless
3089 switch (cmd_ctx
->lsm
->cmd_type
) {
3090 case LTTNG_DISABLE_CHANNEL
:
3091 case LTTNG_DISABLE_EVENT
:
3092 switch (cmd_ctx
->lsm
->domain
.type
) {
3093 case LTTNG_DOMAIN_KERNEL
:
3094 if (!cmd_ctx
->session
->kernel_session
) {
3095 ret
= LTTNG_ERR_NO_CHANNEL
;
3099 case LTTNG_DOMAIN_JUL
:
3100 case LTTNG_DOMAIN_LOG4J
:
3101 case LTTNG_DOMAIN_PYTHON
:
3102 case LTTNG_DOMAIN_UST
:
3103 if (!cmd_ctx
->session
->ust_session
) {
3104 ret
= LTTNG_ERR_NO_CHANNEL
;
3109 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
3121 * Check domain type for specific "pre-action".
3123 switch (cmd_ctx
->lsm
->domain
.type
) {
3124 case LTTNG_DOMAIN_KERNEL
:
3126 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
3130 /* Kernel tracer check */
3131 if (kernel_tracer_fd
== -1) {
3132 /* Basically, load kernel tracer modules */
3133 ret
= init_kernel_tracer();
3139 /* Consumer is in an ERROR state. Report back to client */
3140 if (uatomic_read(&kernel_consumerd_state
) == CONSUMER_ERROR
) {
3141 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
3145 /* Need a session for kernel command */
3146 if (need_tracing_session
) {
3147 if (cmd_ctx
->session
->kernel_session
== NULL
) {
3148 ret
= create_kernel_session(cmd_ctx
->session
);
3150 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
3155 /* Start the kernel consumer daemon */
3156 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3157 if (kconsumer_data
.pid
== 0 &&
3158 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3159 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3160 ret
= start_consumerd(&kconsumer_data
);
3162 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
3165 uatomic_set(&kernel_consumerd_state
, CONSUMER_STARTED
);
3167 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3171 * The consumer was just spawned so we need to add the socket to
3172 * the consumer output of the session if exist.
3174 ret
= consumer_create_socket(&kconsumer_data
,
3175 cmd_ctx
->session
->kernel_session
->consumer
);
3182 case LTTNG_DOMAIN_JUL
:
3183 case LTTNG_DOMAIN_LOG4J
:
3184 case LTTNG_DOMAIN_PYTHON
:
3185 case LTTNG_DOMAIN_UST
:
3187 if (!ust_app_supported()) {
3188 ret
= LTTNG_ERR_NO_UST
;
3191 /* Consumer is in an ERROR state. Report back to client */
3192 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
3193 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
3197 if (need_tracing_session
) {
3198 /* Create UST session if none exist. */
3199 if (cmd_ctx
->session
->ust_session
== NULL
) {
3200 ret
= create_ust_session(cmd_ctx
->session
,
3201 &cmd_ctx
->lsm
->domain
);
3202 if (ret
!= LTTNG_OK
) {
3207 /* Start the UST consumer daemons */
3209 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
3210 if (config
.consumerd64_bin_path
.value
&&
3211 ustconsumer64_data
.pid
== 0 &&
3212 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3213 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3214 ret
= start_consumerd(&ustconsumer64_data
);
3216 ret
= LTTNG_ERR_UST_CONSUMER64_FAIL
;
3217 uatomic_set(&ust_consumerd64_fd
, -EINVAL
);
3221 uatomic_set(&ust_consumerd64_fd
, ustconsumer64_data
.cmd_sock
);
3222 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
3224 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3228 * Setup socket for consumer 64 bit. No need for atomic access
3229 * since it was set above and can ONLY be set in this thread.
3231 ret
= consumer_create_socket(&ustconsumer64_data
,
3232 cmd_ctx
->session
->ust_session
->consumer
);
3238 pthread_mutex_lock(&ustconsumer32_data
.pid_mutex
);
3239 if (config
.consumerd32_bin_path
.value
&&
3240 ustconsumer32_data
.pid
== 0 &&
3241 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3242 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3243 ret
= start_consumerd(&ustconsumer32_data
);
3245 ret
= LTTNG_ERR_UST_CONSUMER32_FAIL
;
3246 uatomic_set(&ust_consumerd32_fd
, -EINVAL
);
3250 uatomic_set(&ust_consumerd32_fd
, ustconsumer32_data
.cmd_sock
);
3251 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
3253 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3257 * Setup socket for consumer 64 bit. No need for atomic access
3258 * since it was set above and can ONLY be set in this thread.
3260 ret
= consumer_create_socket(&ustconsumer32_data
,
3261 cmd_ctx
->session
->ust_session
->consumer
);
3273 /* Validate consumer daemon state when start/stop trace command */
3274 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_START_TRACE
||
3275 cmd_ctx
->lsm
->cmd_type
== LTTNG_STOP_TRACE
) {
3276 switch (cmd_ctx
->lsm
->domain
.type
) {
3277 case LTTNG_DOMAIN_NONE
:
3279 case LTTNG_DOMAIN_JUL
:
3280 case LTTNG_DOMAIN_LOG4J
:
3281 case LTTNG_DOMAIN_PYTHON
:
3282 case LTTNG_DOMAIN_UST
:
3283 if (uatomic_read(&ust_consumerd_state
) != CONSUMER_STARTED
) {
3284 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
3288 case LTTNG_DOMAIN_KERNEL
:
3289 if (uatomic_read(&kernel_consumerd_state
) != CONSUMER_STARTED
) {
3290 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
3295 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
3301 * Check that the UID or GID match that of the tracing session.
3302 * The root user can interact with all sessions.
3304 if (need_tracing_session
) {
3305 if (!session_access_ok(cmd_ctx
->session
,
3306 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3307 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
3308 ret
= LTTNG_ERR_EPERM
;
3314 * Send relayd information to consumer as soon as we have a domain and a
3317 if (cmd_ctx
->session
&& need_domain
) {
3319 * Setup relayd if not done yet. If the relayd information was already
3320 * sent to the consumer, this call will gracefully return.
3322 ret
= cmd_setup_relayd(cmd_ctx
->session
);
3323 if (ret
!= LTTNG_OK
) {
3328 /* Process by command type */
3329 switch (cmd_ctx
->lsm
->cmd_type
) {
3330 case LTTNG_ADD_CONTEXT
:
3333 * An LTTNG_ADD_CONTEXT command might have a supplementary
3334 * payload if the context being added is an application context.
3336 if (cmd_ctx
->lsm
->u
.context
.ctx
.ctx
==
3337 LTTNG_EVENT_CONTEXT_APP_CONTEXT
) {
3338 char *provider_name
= NULL
, *context_name
= NULL
;
3339 size_t provider_name_len
=
3340 cmd_ctx
->lsm
->u
.context
.provider_name_len
;
3341 size_t context_name_len
=
3342 cmd_ctx
->lsm
->u
.context
.context_name_len
;
3344 if (provider_name_len
== 0 || context_name_len
== 0) {
3346 * Application provider and context names MUST
3349 ret
= -LTTNG_ERR_INVALID
;
3353 provider_name
= zmalloc(provider_name_len
+ 1);
3354 if (!provider_name
) {
3355 ret
= -LTTNG_ERR_NOMEM
;
3358 cmd_ctx
->lsm
->u
.context
.ctx
.u
.app_ctx
.provider_name
=
3361 context_name
= zmalloc(context_name_len
+ 1);
3362 if (!context_name
) {
3363 ret
= -LTTNG_ERR_NOMEM
;
3364 goto error_add_context
;
3366 cmd_ctx
->lsm
->u
.context
.ctx
.u
.app_ctx
.ctx_name
=
3369 ret
= lttcomm_recv_unix_sock(sock
, provider_name
,
3372 goto error_add_context
;
3375 ret
= lttcomm_recv_unix_sock(sock
, context_name
,
3378 goto error_add_context
;
3383 * cmd_add_context assumes ownership of the provider and context
3386 ret
= cmd_add_context(cmd_ctx
->session
,
3387 cmd_ctx
->lsm
->domain
.type
,
3388 cmd_ctx
->lsm
->u
.context
.channel_name
,
3389 &cmd_ctx
->lsm
->u
.context
.ctx
,
3390 kernel_poll_pipe
[1]);
3392 cmd_ctx
->lsm
->u
.context
.ctx
.u
.app_ctx
.provider_name
= NULL
;
3393 cmd_ctx
->lsm
->u
.context
.ctx
.u
.app_ctx
.ctx_name
= NULL
;
3395 free(cmd_ctx
->lsm
->u
.context
.ctx
.u
.app_ctx
.provider_name
);
3396 free(cmd_ctx
->lsm
->u
.context
.ctx
.u
.app_ctx
.ctx_name
);
3402 case LTTNG_DISABLE_CHANNEL
:
3404 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3405 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3408 case LTTNG_DISABLE_EVENT
:
3412 * FIXME: handle filter; for now we just receive the filter's
3413 * bytecode along with the filter expression which are sent by
3414 * liblttng-ctl and discard them.
3416 * This fixes an issue where the client may block while sending
3417 * the filter payload and encounter an error because the session
3418 * daemon closes the socket without ever handling this data.
3420 size_t count
= cmd_ctx
->lsm
->u
.disable
.expression_len
+
3421 cmd_ctx
->lsm
->u
.disable
.bytecode_len
;
3424 char data
[LTTNG_FILTER_MAX_LEN
];
3426 DBG("Discarding disable event command payload of size %zu", count
);
3428 ret
= lttcomm_recv_unix_sock(sock
, data
,
3429 count
> sizeof(data
) ? sizeof(data
) : count
);
3434 count
-= (size_t) ret
;
3437 /* FIXME: passing packed structure to non-packed pointer */
3438 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3439 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3440 &cmd_ctx
->lsm
->u
.disable
.event
);
3443 case LTTNG_ENABLE_CHANNEL
:
3445 cmd_ctx
->lsm
->u
.channel
.chan
.attr
.extended
.ptr
=
3446 (struct lttng_channel_extended
*) &cmd_ctx
->lsm
->u
.channel
.extended
;
3447 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3448 &cmd_ctx
->lsm
->u
.channel
.chan
,
3449 kernel_poll_pipe
[1]);
3452 case LTTNG_TRACK_PID
:
3454 ret
= cmd_track_pid(cmd_ctx
->session
,
3455 cmd_ctx
->lsm
->domain
.type
,
3456 cmd_ctx
->lsm
->u
.pid_tracker
.pid
);
3459 case LTTNG_UNTRACK_PID
:
3461 ret
= cmd_untrack_pid(cmd_ctx
->session
,
3462 cmd_ctx
->lsm
->domain
.type
,
3463 cmd_ctx
->lsm
->u
.pid_tracker
.pid
);
3466 case LTTNG_ENABLE_EVENT
:
3468 struct lttng_event_exclusion
*exclusion
= NULL
;
3469 struct lttng_filter_bytecode
*bytecode
= NULL
;
3470 char *filter_expression
= NULL
;
3472 /* Handle exclusion events and receive it from the client. */
3473 if (cmd_ctx
->lsm
->u
.enable
.exclusion_count
> 0) {
3474 size_t count
= cmd_ctx
->lsm
->u
.enable
.exclusion_count
;
3476 exclusion
= zmalloc(sizeof(struct lttng_event_exclusion
) +
3477 (count
* LTTNG_SYMBOL_NAME_LEN
));
3479 ret
= LTTNG_ERR_EXCLUSION_NOMEM
;
3483 DBG("Receiving var len exclusion event list from client ...");
3484 exclusion
->count
= count
;
3485 ret
= lttcomm_recv_unix_sock(sock
, exclusion
->names
,
3486 count
* LTTNG_SYMBOL_NAME_LEN
);
3488 DBG("Nothing recv() from client var len data... continuing");
3491 ret
= LTTNG_ERR_EXCLUSION_INVAL
;
3496 /* Get filter expression from client. */
3497 if (cmd_ctx
->lsm
->u
.enable
.expression_len
> 0) {
3498 size_t expression_len
=
3499 cmd_ctx
->lsm
->u
.enable
.expression_len
;
3501 if (expression_len
> LTTNG_FILTER_MAX_LEN
) {
3502 ret
= LTTNG_ERR_FILTER_INVAL
;
3507 filter_expression
= zmalloc(expression_len
);
3508 if (!filter_expression
) {
3510 ret
= LTTNG_ERR_FILTER_NOMEM
;
3514 /* Receive var. len. data */
3515 DBG("Receiving var len filter's expression from client ...");
3516 ret
= lttcomm_recv_unix_sock(sock
, filter_expression
,
3519 DBG("Nothing recv() from client car len data... continuing");
3521 free(filter_expression
);
3523 ret
= LTTNG_ERR_FILTER_INVAL
;
3528 /* Handle filter and get bytecode from client. */
3529 if (cmd_ctx
->lsm
->u
.enable
.bytecode_len
> 0) {
3530 size_t bytecode_len
= cmd_ctx
->lsm
->u
.enable
.bytecode_len
;
3532 if (bytecode_len
> LTTNG_FILTER_MAX_LEN
) {
3533 ret
= LTTNG_ERR_FILTER_INVAL
;
3534 free(filter_expression
);
3539 bytecode
= zmalloc(bytecode_len
);
3541 free(filter_expression
);
3543 ret
= LTTNG_ERR_FILTER_NOMEM
;
3547 /* Receive var. len. data */
3548 DBG("Receiving var len filter's bytecode from client ...");
3549 ret
= lttcomm_recv_unix_sock(sock
, bytecode
, bytecode_len
);
3551 DBG("Nothing recv() from client car len data... continuing");
3553 free(filter_expression
);
3556 ret
= LTTNG_ERR_FILTER_INVAL
;
3560 if ((bytecode
->len
+ sizeof(*bytecode
)) != bytecode_len
) {
3561 free(filter_expression
);
3564 ret
= LTTNG_ERR_FILTER_INVAL
;
3569 ret
= cmd_enable_event(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3570 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3571 &cmd_ctx
->lsm
->u
.enable
.event
,
3572 filter_expression
, bytecode
, exclusion
,
3573 kernel_poll_pipe
[1]);
3576 case LTTNG_LIST_TRACEPOINTS
:
3578 struct lttng_event
*events
;
3581 session_lock_list();
3582 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3583 session_unlock_list();
3584 if (nb_events
< 0) {
3585 /* Return value is a negative lttng_error_code. */
3591 * Setup lttng message with payload size set to the event list size in
3592 * bytes and then copy list into the llm payload.
3594 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, events
,
3595 sizeof(struct lttng_event
) * nb_events
);
3605 case LTTNG_LIST_TRACEPOINT_FIELDS
:
3607 struct lttng_event_field
*fields
;
3610 session_lock_list();
3611 nb_fields
= cmd_list_tracepoint_fields(cmd_ctx
->lsm
->domain
.type
,
3613 session_unlock_list();
3614 if (nb_fields
< 0) {
3615 /* Return value is a negative lttng_error_code. */
3621 * Setup lttng message with payload size set to the event list size in
3622 * bytes and then copy list into the llm payload.
3624 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, fields
,
3625 sizeof(struct lttng_event_field
) * nb_fields
);
3635 case LTTNG_LIST_SYSCALLS
:
3637 struct lttng_event
*events
;
3640 nb_events
= cmd_list_syscalls(&events
);
3641 if (nb_events
< 0) {
3642 /* Return value is a negative lttng_error_code. */
3648 * Setup lttng message with payload size set to the event list size in
3649 * bytes and then copy list into the llm payload.
3651 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, events
,
3652 sizeof(struct lttng_event
) * nb_events
);
3662 case LTTNG_LIST_TRACKER_PIDS
:
3664 int32_t *pids
= NULL
;
3667 nr_pids
= cmd_list_tracker_pids(cmd_ctx
->session
,
3668 cmd_ctx
->lsm
->domain
.type
, &pids
);
3670 /* Return value is a negative lttng_error_code. */
3676 * Setup lttng message with payload size set to the event list size in
3677 * bytes and then copy list into the llm payload.
3679 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, pids
,
3680 sizeof(int32_t) * nr_pids
);
3690 case LTTNG_SET_CONSUMER_URI
:
3693 struct lttng_uri
*uris
;
3695 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3696 len
= nb_uri
* sizeof(struct lttng_uri
);
3699 ret
= LTTNG_ERR_INVALID
;
3703 uris
= zmalloc(len
);
3705 ret
= LTTNG_ERR_FATAL
;
3709 /* Receive variable len data */
3710 DBG("Receiving %zu URI(s) from client ...", nb_uri
);
3711 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3713 DBG("No URIs received from client... continuing");
3715 ret
= LTTNG_ERR_SESSION_FAIL
;
3720 ret
= cmd_set_consumer_uri(cmd_ctx
->session
, nb_uri
, uris
);
3722 if (ret
!= LTTNG_OK
) {
3729 case LTTNG_START_TRACE
:
3732 * On the first start, if we have a kernel session and we have
3733 * enabled time or size-based rotations, we have to make sure
3734 * the kernel tracer supports it.
3736 if (!cmd_ctx
->session
->has_been_started
&& \
3737 cmd_ctx
->session
->kernel_session
&& \
3738 (cmd_ctx
->session
->rotate_timer_period
|| \
3739 cmd_ctx
->session
->rotate_size
) && \
3740 !check_rotate_compatible()) {
3741 DBG("Kernel tracer version is not compatible with the rotation feature");
3742 ret
= LTTNG_ERR_ROTATION_WRONG_VERSION
;
3745 ret
= cmd_start_trace(cmd_ctx
->session
);
3748 case LTTNG_STOP_TRACE
:
3750 ret
= cmd_stop_trace(cmd_ctx
->session
);
3753 case LTTNG_CREATE_SESSION
:
3756 struct lttng_uri
*uris
= NULL
;
3758 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3759 len
= nb_uri
* sizeof(struct lttng_uri
);
3762 uris
= zmalloc(len
);
3764 ret
= LTTNG_ERR_FATAL
;
3768 /* Receive variable len data */
3769 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3770 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3772 DBG("No URIs received from client... continuing");
3774 ret
= LTTNG_ERR_SESSION_FAIL
;
3779 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3780 DBG("Creating session with ONE network URI is a bad call");
3781 ret
= LTTNG_ERR_SESSION_FAIL
;
3787 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
, nb_uri
,
3788 &cmd_ctx
->creds
, 0);
3794 case LTTNG_DESTROY_SESSION
:
3796 ret
= cmd_destroy_session(cmd_ctx
->session
, kernel_poll_pipe
[1],
3797 notification_thread_handle
);
3799 /* Set session to NULL so we do not unlock it after free. */
3800 cmd_ctx
->session
= NULL
;
3803 case LTTNG_LIST_DOMAINS
:
3806 struct lttng_domain
*domains
= NULL
;
3808 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3810 /* Return value is a negative lttng_error_code. */
3815 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, domains
,
3816 nb_dom
* sizeof(struct lttng_domain
));
3826 case LTTNG_LIST_CHANNELS
:
3828 ssize_t payload_size
;
3829 struct lttng_channel
*channels
= NULL
;
3831 payload_size
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3832 cmd_ctx
->session
, &channels
);
3833 if (payload_size
< 0) {
3834 /* Return value is a negative lttng_error_code. */
3835 ret
= -payload_size
;
3839 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, channels
,
3850 case LTTNG_LIST_EVENTS
:
3853 struct lttng_event
*events
= NULL
;
3854 struct lttcomm_event_command_header cmd_header
;
3857 memset(&cmd_header
, 0, sizeof(cmd_header
));
3858 /* Extended infos are included at the end of events */
3859 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
,
3860 cmd_ctx
->session
, cmd_ctx
->lsm
->u
.list
.channel_name
,
3861 &events
, &total_size
);
3864 /* Return value is a negative lttng_error_code. */
3869 cmd_header
.nb_events
= nb_event
;
3870 ret
= setup_lttng_msg(cmd_ctx
, events
, total_size
,
3871 &cmd_header
, sizeof(cmd_header
));
3881 case LTTNG_LIST_SESSIONS
:
3883 unsigned int nr_sessions
;
3884 void *sessions_payload
;
3887 session_lock_list();
3888 nr_sessions
= lttng_sessions_count(
3889 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3890 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3891 payload_len
= sizeof(struct lttng_session
) * nr_sessions
;
3892 sessions_payload
= zmalloc(payload_len
);
3894 if (!sessions_payload
) {
3895 session_unlock_list();
3900 cmd_list_lttng_sessions(sessions_payload
,
3901 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3902 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3903 session_unlock_list();
3905 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, sessions_payload
,
3907 free(sessions_payload
);
3916 case LTTNG_REGISTER_CONSUMER
:
3918 struct consumer_data
*cdata
;
3920 switch (cmd_ctx
->lsm
->domain
.type
) {
3921 case LTTNG_DOMAIN_KERNEL
:
3922 cdata
= &kconsumer_data
;
3925 ret
= LTTNG_ERR_UND
;
3929 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3930 cmd_ctx
->lsm
->u
.reg
.path
, cdata
);
3933 case LTTNG_DATA_PENDING
:
3936 uint8_t pending_ret_byte
;
3938 pending_ret
= cmd_data_pending(cmd_ctx
->session
);
3943 * This function may returns 0 or 1 to indicate whether or not
3944 * there is data pending. In case of error, it should return an
3945 * LTTNG_ERR code. However, some code paths may still return
3946 * a nondescript error code, which we handle by returning an
3949 if (pending_ret
== 0 || pending_ret
== 1) {
3951 * ret will be set to LTTNG_OK at the end of
3954 } else if (pending_ret
< 0) {
3955 ret
= LTTNG_ERR_UNK
;
3962 pending_ret_byte
= (uint8_t) pending_ret
;
3964 /* 1 byte to return whether or not data is pending */
3965 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
,
3966 &pending_ret_byte
, 1);
3975 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
3977 struct lttcomm_lttng_output_id reply
;
3979 ret
= cmd_snapshot_add_output(cmd_ctx
->session
,
3980 &cmd_ctx
->lsm
->u
.snapshot_output
.output
, &reply
.id
);
3981 if (ret
!= LTTNG_OK
) {
3985 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &reply
,
3991 /* Copy output list into message payload */
3995 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
3997 ret
= cmd_snapshot_del_output(cmd_ctx
->session
,
3998 &cmd_ctx
->lsm
->u
.snapshot_output
.output
);
4001 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
4004 struct lttng_snapshot_output
*outputs
= NULL
;
4006 nb_output
= cmd_snapshot_list_outputs(cmd_ctx
->session
, &outputs
);
4007 if (nb_output
< 0) {
4012 assert((nb_output
> 0 && outputs
) || nb_output
== 0);
4013 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, outputs
,
4014 nb_output
* sizeof(struct lttng_snapshot_output
));
4024 case LTTNG_SNAPSHOT_RECORD
:
4026 ret
= cmd_snapshot_record(cmd_ctx
->session
,
4027 &cmd_ctx
->lsm
->u
.snapshot_record
.output
,
4028 cmd_ctx
->lsm
->u
.snapshot_record
.wait
);
4031 case LTTNG_CREATE_SESSION_SNAPSHOT
:
4034 struct lttng_uri
*uris
= NULL
;
4036 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
4037 len
= nb_uri
* sizeof(struct lttng_uri
);
4040 uris
= zmalloc(len
);
4042 ret
= LTTNG_ERR_FATAL
;
4046 /* Receive variable len data */
4047 DBG("Waiting for %zu URIs from client ...", nb_uri
);
4048 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
4050 DBG("No URIs received from client... continuing");
4052 ret
= LTTNG_ERR_SESSION_FAIL
;
4057 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
4058 DBG("Creating session with ONE network URI is a bad call");
4059 ret
= LTTNG_ERR_SESSION_FAIL
;
4065 ret
= cmd_create_session_snapshot(cmd_ctx
->lsm
->session
.name
, uris
,
4066 nb_uri
, &cmd_ctx
->creds
);
4070 case LTTNG_CREATE_SESSION_LIVE
:
4073 struct lttng_uri
*uris
= NULL
;
4075 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
4076 len
= nb_uri
* sizeof(struct lttng_uri
);
4079 uris
= zmalloc(len
);
4081 ret
= LTTNG_ERR_FATAL
;
4085 /* Receive variable len data */
4086 DBG("Waiting for %zu URIs from client ...", nb_uri
);
4087 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
4089 DBG("No URIs received from client... continuing");
4091 ret
= LTTNG_ERR_SESSION_FAIL
;
4096 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
4097 DBG("Creating session with ONE network URI is a bad call");
4098 ret
= LTTNG_ERR_SESSION_FAIL
;
4104 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
,
4105 nb_uri
, &cmd_ctx
->creds
, cmd_ctx
->lsm
->u
.session_live
.timer_interval
);
4109 case LTTNG_SAVE_SESSION
:
4111 ret
= cmd_save_sessions(&cmd_ctx
->lsm
->u
.save_session
.attr
,
4115 case LTTNG_SET_SESSION_SHM_PATH
:
4117 ret
= cmd_set_session_shm_path(cmd_ctx
->session
,
4118 cmd_ctx
->lsm
->u
.set_shm_path
.shm_path
);
4121 case LTTNG_REGENERATE_METADATA
:
4123 ret
= cmd_regenerate_metadata(cmd_ctx
->session
);
4126 case LTTNG_REGENERATE_STATEDUMP
:
4128 ret
= cmd_regenerate_statedump(cmd_ctx
->session
);
4131 case LTTNG_REGISTER_TRIGGER
:
4133 ret
= cmd_register_trigger(cmd_ctx
, sock
,
4134 notification_thread_handle
);
4137 case LTTNG_UNREGISTER_TRIGGER
:
4139 ret
= cmd_unregister_trigger(cmd_ctx
, sock
,
4140 notification_thread_handle
);
4143 case LTTNG_ROTATE_SESSION
:
4145 struct lttng_rotate_session_return rotate_return
;
4147 DBG("Client rotate session \"%s\"", cmd_ctx
->session
->name
);
4149 memset(&rotate_return
, 0, sizeof(rotate_return
));
4150 if (cmd_ctx
->session
->kernel_session
&& !check_rotate_compatible()) {
4151 DBG("Kernel tracer version is not compatible with the rotation feature");
4152 ret
= LTTNG_ERR_ROTATION_WRONG_VERSION
;
4156 ret
= cmd_rotate_session(cmd_ctx
->session
, &rotate_return
);
4162 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &rotate_return
,
4163 sizeof(rotate_return
));
4172 case LTTNG_ROTATION_GET_INFO
:
4174 struct lttng_rotation_get_info_return get_info_return
;
4176 memset(&get_info_return
, 0, sizeof(get_info_return
));
4177 ret
= cmd_rotate_get_info(cmd_ctx
->session
, &get_info_return
,
4178 cmd_ctx
->lsm
->u
.get_rotation_info
.rotation_id
);
4184 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &get_info_return
,
4185 sizeof(get_info_return
));
4194 case LTTNG_SESSION_GET_CURRENT_OUTPUT
:
4196 struct lttng_session_get_current_output_return output_return
;
4198 memset(&output_return
, 0, sizeof(output_return
));
4199 ret
= cmd_session_get_current_output(cmd_ctx
->session
,
4206 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &output_return
,
4207 sizeof(output_return
));
4216 case LTTNG_ROTATION_SET_SCHEDULE
:
4218 if (cmd_ctx
->session
->kernel_session
&& !check_rotate_compatible()) {
4219 DBG("Kernel tracer version does not support session rotations");
4220 ret
= LTTNG_ERR_ROTATION_WRONG_VERSION
;
4224 ret
= cmd_rotation_set_schedule(cmd_ctx
->session
,
4225 cmd_ctx
->lsm
->u
.rotate_setup
.timer_us
,
4226 cmd_ctx
->lsm
->u
.rotate_setup
.size
,
4227 notification_thread_handle
);
4228 if (ret
!= LTTNG_OK
) {
4234 case LTTNG_ROTATION_SCHEDULE_GET_TIMER_PERIOD
:
4236 struct lttng_rotation_schedule_get_timer_period
*get_timer
;
4238 get_timer
= zmalloc(sizeof(struct lttng_rotation_schedule_get_timer_period
));
4243 get_timer
->rotate_timer
= cmd_ctx
->session
->rotate_timer_period
;
4245 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, get_timer
,
4246 sizeof(struct lttng_rotation_schedule_get_timer_period
));
4256 case LTTNG_ROTATION_SCHEDULE_GET_SIZE
:
4258 struct lttng_rotation_schedule_get_size
*get_size
;
4260 get_size
= zmalloc(sizeof(struct lttng_rotation_schedule_get_size
));
4265 get_size
->rotate_size
= cmd_ctx
->session
->rotate_size
;
4267 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, get_size
,
4268 sizeof(struct lttng_rotation_schedule_get_size
));
4279 ret
= LTTNG_ERR_UND
;
4284 if (cmd_ctx
->llm
== NULL
) {
4285 DBG("Missing llm structure. Allocating one.");
4286 if (setup_lttng_msg_no_cmd_header(cmd_ctx
, NULL
, 0) < 0) {
4290 /* Set return code */
4291 cmd_ctx
->llm
->ret_code
= ret
;
4293 if (cmd_ctx
->session
) {
4294 session_unlock(cmd_ctx
->session
);
4296 if (need_tracing_session
) {
4297 session_unlock_list();
4300 assert(!rcu_read_ongoing());
4305 * Thread managing health check socket.
4307 static void *thread_manage_health(void *data
)
4309 int sock
= -1, new_sock
= -1, ret
, i
, pollfd
, err
= -1;
4310 uint32_t revents
, nb_fd
;
4311 struct lttng_poll_event events
;
4312 struct health_comm_msg msg
;
4313 struct health_comm_reply reply
;
4315 DBG("[thread] Manage health check started");
4317 rcu_register_thread();
4319 /* We might hit an error path before this is created. */
4320 lttng_poll_init(&events
);
4322 /* Create unix socket */
4323 sock
= lttcomm_create_unix_sock(config
.health_unix_sock_path
.value
);
4325 ERR("Unable to create health check Unix socket");
4330 /* lttng health client socket path permissions */
4331 ret
= chown(config
.health_unix_sock_path
.value
, 0,
4332 utils_get_group_id(config
.tracing_group_name
.value
));
4334 ERR("Unable to set group on %s", config
.health_unix_sock_path
.value
);
4339 ret
= chmod(config
.health_unix_sock_path
.value
,
4340 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4342 ERR("Unable to set permissions on %s", config
.health_unix_sock_path
.value
);
4349 * Set the CLOEXEC flag. Return code is useless because either way, the
4352 (void) utils_set_fd_cloexec(sock
);
4354 ret
= lttcomm_listen_unix_sock(sock
);
4360 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
4361 * more will be added to this poll set.
4363 ret
= sessiond_set_thread_pollset(&events
, 2);
4368 /* Add the application registration socket */
4369 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLPRI
);
4374 sessiond_notify_ready();
4377 DBG("Health check ready");
4379 /* Inifinite blocking call, waiting for transmission */
4381 ret
= lttng_poll_wait(&events
, -1);
4384 * Restart interrupted system call.
4386 if (errno
== EINTR
) {
4394 for (i
= 0; i
< nb_fd
; i
++) {
4395 /* Fetch once the poll data */
4396 revents
= LTTNG_POLL_GETEV(&events
, i
);
4397 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
4400 /* No activity for this FD (poll implementation). */
4404 /* Thread quit pipe has been closed. Killing thread. */
4405 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
4411 /* Event on the registration socket */
4412 if (pollfd
== sock
) {
4413 if (revents
& LPOLLIN
) {
4415 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
4416 ERR("Health socket poll error");
4419 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
4425 new_sock
= lttcomm_accept_unix_sock(sock
);
4431 * Set the CLOEXEC flag. Return code is useless because either way, the
4434 (void) utils_set_fd_cloexec(new_sock
);
4436 DBG("Receiving data from client for health...");
4437 ret
= lttcomm_recv_unix_sock(new_sock
, (void *)&msg
, sizeof(msg
));
4439 DBG("Nothing recv() from client... continuing");
4440 ret
= close(new_sock
);
4447 rcu_thread_online();
4449 memset(&reply
, 0, sizeof(reply
));
4450 for (i
= 0; i
< NR_HEALTH_SESSIOND_TYPES
; i
++) {
4452 * health_check_state returns 0 if health is
4455 if (!health_check_state(health_sessiond
, i
)) {
4456 reply
.ret_code
|= 1ULL << i
;
4460 DBG2("Health check return value %" PRIx64
, reply
.ret_code
);
4462 ret
= send_unix_sock(new_sock
, (void *) &reply
, sizeof(reply
));
4464 ERR("Failed to send health data back to client");
4467 /* End of transmission */
4468 ret
= close(new_sock
);
4477 ERR("Health error occurred in %s", __func__
);
4479 DBG("Health check thread dying");
4480 unlink(config
.health_unix_sock_path
.value
);
4488 lttng_poll_clean(&events
);
4490 rcu_unregister_thread();
4495 * This thread manage all clients request using the unix client socket for
4498 static void *thread_manage_clients(void *data
)
4500 int sock
= -1, ret
, i
, pollfd
, err
= -1;
4502 uint32_t revents
, nb_fd
;
4503 struct command_ctx
*cmd_ctx
= NULL
;
4504 struct lttng_poll_event events
;
4506 DBG("[thread] Manage client started");
4508 rcu_register_thread();
4510 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_CMD
);
4512 health_code_update();
4514 ret
= lttcomm_listen_unix_sock(client_sock
);
4520 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
4521 * more will be added to this poll set.
4523 ret
= sessiond_set_thread_pollset(&events
, 2);
4525 goto error_create_poll
;
4528 /* Add the application registration socket */
4529 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
4534 ret
= sem_post(&load_info
->message_thread_ready
);
4536 PERROR("sem_post message_thread_ready");
4541 * Wait until all support threads are initialized before accepting
4544 while (uatomic_read(<tng_sessiond_ready
) != 0) {
4546 struct timeval timeout
;
4549 FD_SET(thread_quit_pipe
[0], &read_fds
);
4550 memset(&timeout
, 0, sizeof(timeout
));
4551 timeout
.tv_usec
= 1000;
4554 * If a support thread failed to launch, it may signal that
4555 * we must exit and the sessiond would never be marked as
4558 * The timeout is set to 1ms, which serves as a way to
4559 * pace down this check.
4561 ret
= select(thread_quit_pipe
[0] + 1, &read_fds
, NULL
, NULL
,
4563 if (ret
> 0 || (ret
< 0 && errno
!= EINTR
)) {
4569 /* This testpoint is after we signal readiness to the parent. */
4570 if (testpoint(sessiond_thread_manage_clients
)) {
4574 if (testpoint(sessiond_thread_manage_clients_before_loop
)) {
4578 health_code_update();
4581 DBG("Accepting client command ...");
4583 /* Inifinite blocking call, waiting for transmission */
4585 health_poll_entry();
4586 ret
= lttng_poll_wait(&events
, -1);
4590 * Restart interrupted system call.
4592 if (errno
== EINTR
) {
4600 for (i
= 0; i
< nb_fd
; i
++) {
4601 /* Fetch once the poll data */
4602 revents
= LTTNG_POLL_GETEV(&events
, i
);
4603 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
4605 health_code_update();
4608 /* No activity for this FD (poll implementation). */
4612 /* Thread quit pipe has been closed. Killing thread. */
4613 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
4619 /* Event on the registration socket */
4620 if (pollfd
== client_sock
) {
4621 if (revents
& LPOLLIN
) {
4623 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
4624 ERR("Client socket poll error");
4627 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
4633 DBG("Wait for client response");
4635 health_code_update();
4637 sock
= lttcomm_accept_unix_sock(client_sock
);
4643 * Set the CLOEXEC flag. Return code is useless because either way, the
4646 (void) utils_set_fd_cloexec(sock
);
4648 /* Set socket option for credentials retrieval */
4649 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
4654 /* Allocate context command to process the client request */
4655 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
4656 if (cmd_ctx
== NULL
) {
4657 PERROR("zmalloc cmd_ctx");
4661 /* Allocate data buffer for reception */
4662 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
4663 if (cmd_ctx
->lsm
== NULL
) {
4664 PERROR("zmalloc cmd_ctx->lsm");
4668 cmd_ctx
->llm
= NULL
;
4669 cmd_ctx
->session
= NULL
;
4671 health_code_update();
4674 * Data is received from the lttng client. The struct
4675 * lttcomm_session_msg (lsm) contains the command and data request of
4678 DBG("Receiving data from client ...");
4679 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
4680 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
4682 DBG("Nothing recv() from client... continuing");
4688 clean_command_ctx(&cmd_ctx
);
4692 health_code_update();
4694 // TODO: Validate cmd_ctx including sanity check for
4695 // security purpose.
4697 rcu_thread_online();
4699 * This function dispatch the work to the kernel or userspace tracer
4700 * libs and fill the lttcomm_lttng_msg data structure of all the needed
4701 * informations for the client. The command context struct contains
4702 * everything this function may needs.
4704 ret
= process_client_msg(cmd_ctx
, sock
, &sock_error
);
4705 rcu_thread_offline();
4713 * TODO: Inform client somehow of the fatal error. At
4714 * this point, ret < 0 means that a zmalloc failed
4715 * (ENOMEM). Error detected but still accept
4716 * command, unless a socket error has been
4719 clean_command_ctx(&cmd_ctx
);
4723 health_code_update();
4725 DBG("Sending response (size: %d, retcode: %s (%d))",
4726 cmd_ctx
->lttng_msg_size
,
4727 lttng_strerror(-cmd_ctx
->llm
->ret_code
),
4728 cmd_ctx
->llm
->ret_code
);
4729 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
4731 ERR("Failed to send data back to client");
4734 /* End of transmission */
4741 clean_command_ctx(&cmd_ctx
);
4743 health_code_update();
4755 lttng_poll_clean(&events
);
4756 clean_command_ctx(&cmd_ctx
);
4760 unlink(config
.client_unix_sock_path
.value
);
4761 if (client_sock
>= 0) {
4762 ret
= close(client_sock
);
4770 ERR("Health error occurred in %s", __func__
);
4773 health_unregister(health_sessiond
);
4775 DBG("Client thread dying");
4777 rcu_unregister_thread();
4780 * Since we are creating the consumer threads, we own them, so we need
4781 * to join them before our thread exits.
4783 ret
= join_consumer_thread(&kconsumer_data
);
4786 PERROR("join_consumer");
4789 ret
= join_consumer_thread(&ustconsumer32_data
);
4792 PERROR("join_consumer ust32");
4795 ret
= join_consumer_thread(&ustconsumer64_data
);
4798 PERROR("join_consumer ust64");
4803 static int string_match(const char *str1
, const char *str2
)
4805 return (str1
&& str2
) && !strcmp(str1
, str2
);
4809 * Take an option from the getopt output and set it in the right variable to be
4812 * Return 0 on success else a negative value.
4814 static int set_option(int opt
, const char *arg
, const char *optname
)
4818 if (string_match(optname
, "client-sock") || opt
== 'c') {
4819 if (!arg
|| *arg
== '\0') {
4823 if (lttng_is_setuid_setgid()) {
4824 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4825 "-c, --client-sock");
4827 config_string_set(&config
.client_unix_sock_path
,
4829 if (!config
.client_unix_sock_path
.value
) {
4834 } else if (string_match(optname
, "apps-sock") || opt
== 'a') {
4835 if (!arg
|| *arg
== '\0') {
4839 if (lttng_is_setuid_setgid()) {
4840 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4843 config_string_set(&config
.apps_unix_sock_path
,
4845 if (!config
.apps_unix_sock_path
.value
) {
4850 } else if (string_match(optname
, "daemonize") || opt
== 'd') {
4851 config
.daemonize
= true;
4852 } else if (string_match(optname
, "background") || opt
== 'b') {
4853 config
.background
= true;
4854 } else if (string_match(optname
, "group") || opt
== 'g') {
4855 if (!arg
|| *arg
== '\0') {
4859 if (lttng_is_setuid_setgid()) {
4860 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4863 config_string_set(&config
.tracing_group_name
,
4865 if (!config
.tracing_group_name
.value
) {
4870 } else if (string_match(optname
, "help") || opt
== 'h') {
4871 ret
= utils_show_help(8, "lttng-sessiond", help_msg
);
4873 ERR("Cannot show --help for `lttng-sessiond`");
4876 exit(ret
? EXIT_FAILURE
: EXIT_SUCCESS
);
4877 } else if (string_match(optname
, "version") || opt
== 'V') {
4878 fprintf(stdout
, "%s\n", VERSION
);
4880 } else if (string_match(optname
, "sig-parent") || opt
== 'S') {
4881 config
.sig_parent
= true;
4882 } else if (string_match(optname
, "kconsumerd-err-sock")) {
4883 if (!arg
|| *arg
== '\0') {
4887 if (lttng_is_setuid_setgid()) {
4888 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4889 "--kconsumerd-err-sock");
4891 config_string_set(&config
.kconsumerd_err_unix_sock_path
,
4893 if (!config
.kconsumerd_err_unix_sock_path
.value
) {
4898 } else if (string_match(optname
, "kconsumerd-cmd-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-cmd-sock");
4907 config_string_set(&config
.kconsumerd_cmd_unix_sock_path
,
4909 if (!config
.kconsumerd_cmd_unix_sock_path
.value
) {
4914 } else if (string_match(optname
, "ustconsumerd64-err-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 "--ustconsumerd64-err-sock");
4923 config_string_set(&config
.consumerd64_err_unix_sock_path
,
4925 if (!config
.consumerd64_err_unix_sock_path
.value
) {
4930 } else if (string_match(optname
, "ustconsumerd64-cmd-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-cmd-sock");
4939 config_string_set(&config
.consumerd64_cmd_unix_sock_path
,
4941 if (!config
.consumerd64_cmd_unix_sock_path
.value
) {
4946 } else if (string_match(optname
, "ustconsumerd32-err-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 "--ustconsumerd32-err-sock");
4955 config_string_set(&config
.consumerd32_err_unix_sock_path
,
4957 if (!config
.consumerd32_err_unix_sock_path
.value
) {
4962 } else if (string_match(optname
, "ustconsumerd32-cmd-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-cmd-sock");
4971 config_string_set(&config
.consumerd32_cmd_unix_sock_path
,
4973 if (!config
.consumerd32_cmd_unix_sock_path
.value
) {
4978 } else if (string_match(optname
, "no-kernel")) {
4979 config
.no_kernel
= true;
4980 } else if (string_match(optname
, "quiet") || opt
== 'q') {
4981 config
.quiet
= true;
4982 } else if (string_match(optname
, "verbose") || opt
== 'v') {
4983 /* Verbose level can increase using multiple -v */
4985 /* Value obtained from config file */
4986 config
.verbose
= config_parse_value(arg
);
4988 /* -v used on command line */
4991 /* Clamp value to [0, 3] */
4992 config
.verbose
= config
.verbose
< 0 ? 0 :
4993 (config
.verbose
<= 3 ? config
.verbose
: 3);
4994 } else if (string_match(optname
, "verbose-consumer")) {
4996 config
.verbose_consumer
= config_parse_value(arg
);
4998 config
.verbose_consumer
++;
5000 } else if (string_match(optname
, "consumerd32-path")) {
5001 if (!arg
|| *arg
== '\0') {
5005 if (lttng_is_setuid_setgid()) {
5006 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5007 "--consumerd32-path");
5009 config_string_set(&config
.consumerd32_bin_path
,
5011 if (!config
.consumerd32_bin_path
.value
) {
5016 } else if (string_match(optname
, "consumerd32-libdir")) {
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-libdir");
5025 config_string_set(&config
.consumerd32_lib_dir
,
5027 if (!config
.consumerd32_lib_dir
.value
) {
5032 } else if (string_match(optname
, "consumerd64-path")) {
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 "--consumerd64-path");
5041 config_string_set(&config
.consumerd64_bin_path
,
5043 if (!config
.consumerd64_bin_path
.value
) {
5048 } else if (string_match(optname
, "consumerd64-libdir")) {
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-libdir");
5057 config_string_set(&config
.consumerd64_lib_dir
,
5059 if (!config
.consumerd64_lib_dir
.value
) {
5064 } else if (string_match(optname
, "pidfile") || opt
== 'p') {
5065 if (!arg
|| *arg
== '\0') {
5069 if (lttng_is_setuid_setgid()) {
5070 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5073 config_string_set(&config
.pid_file_path
, strdup(arg
));
5074 if (!config
.pid_file_path
.value
) {
5079 } else if (string_match(optname
, "agent-tcp-port")) {
5080 if (!arg
|| *arg
== '\0') {
5084 if (lttng_is_setuid_setgid()) {
5085 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5086 "--agent-tcp-port");
5091 v
= strtoul(arg
, NULL
, 0);
5092 if (errno
!= 0 || !isdigit(arg
[0])) {
5093 ERR("Wrong value in --agent-tcp-port parameter: %s", arg
);
5096 if (v
== 0 || v
>= 65535) {
5097 ERR("Port overflow in --agent-tcp-port parameter: %s", arg
);
5100 config
.agent_tcp_port
.begin
= config
.agent_tcp_port
.end
= (int) v
;
5101 DBG3("Agent TCP port set to non default: %i", (int) v
);
5103 } else if (string_match(optname
, "load") || opt
== 'l') {
5104 if (!arg
|| *arg
== '\0') {
5108 if (lttng_is_setuid_setgid()) {
5109 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5112 config_string_set(&config
.load_session_path
, strdup(arg
));
5113 if (!config
.load_session_path
.value
) {
5118 } else if (string_match(optname
, "kmod-probes")) {
5119 if (!arg
|| *arg
== '\0') {
5123 if (lttng_is_setuid_setgid()) {
5124 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5127 config_string_set(&config
.kmod_probes_list
, strdup(arg
));
5128 if (!config
.kmod_probes_list
.value
) {
5133 } else if (string_match(optname
, "extra-kmod-probes")) {
5134 if (!arg
|| *arg
== '\0') {
5138 if (lttng_is_setuid_setgid()) {
5139 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5140 "--extra-kmod-probes");
5142 config_string_set(&config
.kmod_extra_probes_list
,
5144 if (!config
.kmod_extra_probes_list
.value
) {
5149 } else if (string_match(optname
, "config") || opt
== 'f') {
5150 /* This is handled in set_options() thus silent skip. */
5153 /* Unknown option or other error.
5154 * Error is printed by getopt, just return */
5159 if (ret
== -EINVAL
) {
5160 const char *opt_name
= "unknown";
5163 for (i
= 0; i
< sizeof(long_options
) / sizeof(struct option
);
5165 if (opt
== long_options
[i
].val
) {
5166 opt_name
= long_options
[i
].name
;
5171 WARN("Invalid argument provided for option \"%s\", using default value.",
5179 * config_entry_handler_cb used to handle options read from a config file.
5180 * See config_entry_handler_cb comment in common/config/session-config.h for the
5181 * return value conventions.
5183 static int config_entry_handler(const struct config_entry
*entry
, void *unused
)
5187 if (!entry
|| !entry
->name
|| !entry
->value
) {
5192 /* Check if the option is to be ignored */
5193 for (i
= 0; i
< sizeof(config_ignore_options
) / sizeof(char *); i
++) {
5194 if (!strcmp(entry
->name
, config_ignore_options
[i
])) {
5199 for (i
= 0; i
< (sizeof(long_options
) / sizeof(struct option
)) - 1;
5202 /* Ignore if not fully matched. */
5203 if (strcmp(entry
->name
, long_options
[i
].name
)) {
5208 * If the option takes no argument on the command line, we have to
5209 * check if the value is "true". We support non-zero numeric values,
5212 if (!long_options
[i
].has_arg
) {
5213 ret
= config_parse_value(entry
->value
);
5216 WARN("Invalid configuration value \"%s\" for option %s",
5217 entry
->value
, entry
->name
);
5219 /* False, skip boolean config option. */
5224 ret
= set_option(long_options
[i
].val
, entry
->value
, entry
->name
);
5228 WARN("Unrecognized option \"%s\" in daemon configuration file.", entry
->name
);
5235 * daemon configuration loading and argument parsing
5237 static int set_options(int argc
, char **argv
)
5239 int ret
= 0, c
= 0, option_index
= 0;
5240 int orig_optopt
= optopt
, orig_optind
= optind
;
5242 const char *config_path
= NULL
;
5244 optstring
= utils_generate_optstring(long_options
,
5245 sizeof(long_options
) / sizeof(struct option
));
5251 /* Check for the --config option */
5252 while ((c
= getopt_long(argc
, argv
, optstring
, long_options
,
5253 &option_index
)) != -1) {
5257 } else if (c
!= 'f') {
5258 /* if not equal to --config option. */
5262 if (lttng_is_setuid_setgid()) {
5263 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5266 config_path
= utils_expand_path(optarg
);
5268 ERR("Failed to resolve path: %s", optarg
);
5273 ret
= config_get_section_entries(config_path
, config_section_name
,
5274 config_entry_handler
, NULL
);
5277 ERR("Invalid configuration option at line %i", ret
);
5283 /* Reset getopt's global state */
5284 optopt
= orig_optopt
;
5285 optind
= orig_optind
;
5289 * getopt_long() will not set option_index if it encounters a
5292 c
= getopt_long(argc
, argv
, optstring
, long_options
,
5299 * Pass NULL as the long option name if popt left the index
5302 ret
= set_option(c
, optarg
,
5303 option_index
< 0 ? NULL
:
5304 long_options
[option_index
].name
);
5316 * Creates the two needed socket by the daemon.
5317 * apps_sock - The communication socket for all UST apps.
5318 * client_sock - The communication of the cli tool (lttng).
5320 static int init_daemon_socket(void)
5325 old_umask
= umask(0);
5327 /* Create client tool unix socket */
5328 client_sock
= lttcomm_create_unix_sock(config
.client_unix_sock_path
.value
);
5329 if (client_sock
< 0) {
5330 ERR("Create unix sock failed: %s", config
.client_unix_sock_path
.value
);
5335 /* Set the cloexec flag */
5336 ret
= utils_set_fd_cloexec(client_sock
);
5338 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
5339 "Continuing but note that the consumer daemon will have a "
5340 "reference to this socket on exec()", client_sock
);
5343 /* File permission MUST be 660 */
5344 ret
= chmod(config
.client_unix_sock_path
.value
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
5346 ERR("Set file permissions failed: %s", config
.client_unix_sock_path
.value
);
5351 /* Create the application unix socket */
5352 apps_sock
= lttcomm_create_unix_sock(config
.apps_unix_sock_path
.value
);
5353 if (apps_sock
< 0) {
5354 ERR("Create unix sock failed: %s", config
.apps_unix_sock_path
.value
);
5359 /* Set the cloexec flag */
5360 ret
= utils_set_fd_cloexec(apps_sock
);
5362 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
5363 "Continuing but note that the consumer daemon will have a "
5364 "reference to this socket on exec()", apps_sock
);
5367 /* File permission MUST be 666 */
5368 ret
= chmod(config
.apps_unix_sock_path
.value
,
5369 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
5371 ERR("Set file permissions failed: %s", config
.apps_unix_sock_path
.value
);
5376 DBG3("Session daemon client socket %d and application socket %d created",
5377 client_sock
, apps_sock
);
5385 * Create lockfile using the rundir and return its fd.
5387 static int create_lockfile(void)
5389 return utils_create_lock_file(config
.lock_file_path
.value
);
5393 * Check if the global socket is available, and if a daemon is answering at the
5394 * other side. If yes, error is returned.
5396 * Also attempts to create and hold the lock file.
5398 static int check_existing_daemon(void)
5402 /* Is there anybody out there ? */
5403 if (lttng_session_daemon_alive()) {
5408 lockfile_fd
= create_lockfile();
5409 if (lockfile_fd
< 0) {
5417 static void sessiond_cleanup_lock_file(void)
5422 * Cleanup lock file by deleting it and finaly closing it which will
5423 * release the file system lock.
5425 if (lockfile_fd
>= 0) {
5426 ret
= remove(config
.lock_file_path
.value
);
5428 PERROR("remove lock file");
5430 ret
= close(lockfile_fd
);
5432 PERROR("close lock file");
5438 * Set the tracing group gid onto the client socket.
5440 * Race window between mkdir and chown is OK because we are going from more
5441 * permissive (root.root) to less permissive (root.tracing).
5443 static int set_permissions(char *rundir
)
5448 gid
= utils_get_group_id(config
.tracing_group_name
.value
);
5450 /* Set lttng run dir */
5451 ret
= chown(rundir
, 0, gid
);
5453 ERR("Unable to set group on %s", rundir
);
5458 * Ensure all applications and tracing group can search the run
5459 * dir. Allow everyone to read the directory, since it does not
5460 * buy us anything to hide its content.
5462 ret
= chmod(rundir
, S_IRWXU
| S_IRGRP
| S_IXGRP
| S_IROTH
| S_IXOTH
);
5464 ERR("Unable to set permissions on %s", rundir
);
5468 /* lttng client socket path */
5469 ret
= chown(config
.client_unix_sock_path
.value
, 0, gid
);
5471 ERR("Unable to set group on %s", config
.client_unix_sock_path
.value
);
5475 /* kconsumer error socket path */
5476 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, 0);
5478 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
5482 /* 64-bit ustconsumer error socket path */
5483 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, 0);
5485 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
5489 /* 32-bit ustconsumer compat32 error socket path */
5490 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, 0);
5492 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
5496 DBG("All permissions are set");
5502 * Create the lttng run directory needed for all global sockets and pipe.
5504 static int create_lttng_rundir(void)
5508 DBG3("Creating LTTng run directory: %s", config
.rundir
.value
);
5510 ret
= mkdir(config
.rundir
.value
, S_IRWXU
);
5512 if (errno
!= EEXIST
) {
5513 ERR("Unable to create %s", config
.rundir
.value
);
5525 * Setup sockets and directory needed by the consumerds' communication with the
5528 static int set_consumer_sockets(struct consumer_data
*consumer_data
)
5533 switch (consumer_data
->type
) {
5534 case LTTNG_CONSUMER_KERNEL
:
5535 path
= config
.kconsumerd_path
.value
;
5537 case LTTNG_CONSUMER64_UST
:
5538 path
= config
.consumerd64_path
.value
;
5540 case LTTNG_CONSUMER32_UST
:
5541 path
= config
.consumerd32_path
.value
;
5544 ERR("Consumer type unknown");
5550 DBG2("Creating consumer directory: %s", path
);
5552 ret
= mkdir(path
, S_IRWXU
| S_IRGRP
| S_IXGRP
);
5553 if (ret
< 0 && errno
!= EEXIST
) {
5555 ERR("Failed to create %s", path
);
5559 ret
= chown(path
, 0, utils_get_group_id(config
.tracing_group_name
.value
));
5561 ERR("Unable to set group on %s", path
);
5567 /* Create the consumerd error unix socket */
5568 consumer_data
->err_sock
=
5569 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
5570 if (consumer_data
->err_sock
< 0) {
5571 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
5577 * Set the CLOEXEC flag. Return code is useless because either way, the
5580 ret
= utils_set_fd_cloexec(consumer_data
->err_sock
);
5582 PERROR("utils_set_fd_cloexec");
5583 /* continue anyway */
5586 /* File permission MUST be 660 */
5587 ret
= chmod(consumer_data
->err_unix_sock_path
,
5588 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
5590 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
5600 * Signal handler for the daemon
5602 * Simply stop all worker threads, leaving main() return gracefully after
5603 * joining all threads and calling cleanup().
5605 static void sighandler(int sig
)
5609 DBG("SIGINT caught");
5613 DBG("SIGTERM caught");
5617 CMM_STORE_SHARED(recv_child_signal
, 1);
5625 * Setup signal handler for :
5626 * SIGINT, SIGTERM, SIGPIPE
5628 static int set_signal_handler(void)
5631 struct sigaction sa
;
5634 if ((ret
= sigemptyset(&sigset
)) < 0) {
5635 PERROR("sigemptyset");
5639 sa
.sa_mask
= sigset
;
5642 sa
.sa_handler
= sighandler
;
5643 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
5644 PERROR("sigaction");
5648 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
5649 PERROR("sigaction");
5653 if ((ret
= sigaction(SIGUSR1
, &sa
, NULL
)) < 0) {
5654 PERROR("sigaction");
5658 sa
.sa_handler
= SIG_IGN
;
5659 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
5660 PERROR("sigaction");
5664 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
5670 * Set open files limit to unlimited. This daemon can open a large number of
5671 * file descriptors in order to consume multiple kernel traces.
5673 static void set_ulimit(void)
5678 /* The kernel does not allow an infinite limit for open files */
5679 lim
.rlim_cur
= 65535;
5680 lim
.rlim_max
= 65535;
5682 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
5684 PERROR("failed to set open files limit");
5688 static int write_pidfile(void)
5690 return utils_create_pid_file(getpid(), config
.pid_file_path
.value
);
5693 static int set_clock_plugin_env(void)
5696 char *env_value
= NULL
;
5698 if (!config
.lttng_ust_clock_plugin
.value
) {
5702 ret
= asprintf(&env_value
, "LTTNG_UST_CLOCK_PLUGIN=%s",
5703 config
.lttng_ust_clock_plugin
.value
);
5709 ret
= putenv(env_value
);
5712 PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN");
5716 DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"",
5717 config
.lttng_ust_clock_plugin
.value
);
5723 struct rotation_thread_timer_queue
*create_rotate_timer_queue(void)
5725 struct rotation_thread_timer_queue
*queue
= NULL
;
5727 queue
= zmalloc(sizeof(struct rotation_thread_timer_queue
));
5729 PERROR("Failed to allocate timer rotate queue");
5733 queue
->event_pipe
= lttng_pipe_open(FD_CLOEXEC
| O_NONBLOCK
);
5734 CDS_INIT_LIST_HEAD(&queue
->list
);
5735 pthread_mutex_init(&queue
->lock
, NULL
);
5742 void destroy_rotate_timer_queue(struct rotation_thread_timer_queue
*queue
)
5744 struct sessiond_rotation_timer
*node
, *tmp_node
;
5750 lttng_pipe_destroy(queue
->event_pipe
);
5752 pthread_mutex_lock(&queue
->lock
);
5753 /* Empty wait queue. */
5754 cds_list_for_each_entry_safe(node
, tmp_node
, &queue
->list
, head
) {
5755 cds_list_del(&node
->head
);
5758 pthread_mutex_unlock(&queue
->lock
);
5760 pthread_mutex_destroy(&queue
->lock
);
5767 int main(int argc
, char **argv
)
5769 int ret
= 0, retval
= 0;
5771 const char *env_app_timeout
;
5772 struct lttng_pipe
*ust32_channel_monitor_pipe
= NULL
,
5773 *ust64_channel_monitor_pipe
= NULL
,
5774 *kernel_channel_monitor_pipe
= NULL
;
5775 bool notification_thread_launched
= false;
5776 bool rotation_thread_launched
= false;
5777 bool timer_thread_launched
= false;
5778 struct lttng_pipe
*ust32_channel_rotate_pipe
= NULL
,
5779 *ust64_channel_rotate_pipe
= NULL
,
5780 *kernel_channel_rotate_pipe
= NULL
;
5781 struct timer_thread_parameters timer_thread_ctx
;
5782 /* Queue of rotation jobs populated by the sessiond-timer. */
5783 struct rotation_thread_timer_queue
*rotation_timer_queue
= NULL
;
5784 sem_t notification_thread_ready
;
5786 init_kernel_workarounds();
5788 rcu_register_thread();
5790 if (set_signal_handler()) {
5792 goto exit_set_signal_handler
;
5795 if (sessiond_timer_signal_init()) {
5797 goto exit_set_signal_handler
;
5800 page_size
= sysconf(_SC_PAGESIZE
);
5801 if (page_size
< 0) {
5802 PERROR("sysconf _SC_PAGESIZE");
5803 page_size
= LONG_MAX
;
5804 WARN("Fallback page size to %ld", page_size
);
5807 ret
= sessiond_config_init(&config
);
5810 goto exit_set_signal_handler
;
5814 * Parse arguments and load the daemon configuration file.
5816 * We have an exit_options exit path to free memory reserved by
5817 * set_options. This is needed because the rest of sessiond_cleanup()
5818 * depends on ht_cleanup_thread, which depends on lttng_daemonize, which
5819 * depends on set_options.
5822 if (set_options(argc
, argv
)) {
5827 /* Init config from environment variables. */
5828 sessiond_config_apply_env_config(&config
);
5831 * Resolve all paths received as arguments, configuration option, or
5832 * through environment variable as absolute paths. This is necessary
5833 * since daemonizing causes the sessiond's current working directory
5836 ret
= sessiond_config_resolve_paths(&config
);
5842 lttng_opt_verbose
= config
.verbose
;
5843 lttng_opt_quiet
= config
.quiet
;
5844 kconsumer_data
.err_unix_sock_path
=
5845 config
.kconsumerd_err_unix_sock_path
.value
;
5846 kconsumer_data
.cmd_unix_sock_path
=
5847 config
.kconsumerd_cmd_unix_sock_path
.value
;
5848 ustconsumer32_data
.err_unix_sock_path
=
5849 config
.consumerd32_err_unix_sock_path
.value
;
5850 ustconsumer32_data
.cmd_unix_sock_path
=
5851 config
.consumerd32_cmd_unix_sock_path
.value
;
5852 ustconsumer64_data
.err_unix_sock_path
=
5853 config
.consumerd64_err_unix_sock_path
.value
;
5854 ustconsumer64_data
.cmd_unix_sock_path
=
5855 config
.consumerd64_cmd_unix_sock_path
.value
;
5856 set_clock_plugin_env();
5858 sessiond_config_log(&config
);
5860 if (create_lttng_rundir()) {
5865 /* Abort launch if a session daemon is already running. */
5866 if (check_existing_daemon()) {
5867 ERR("A session daemon is already running.");
5873 if (config
.daemonize
|| config
.background
) {
5876 ret
= lttng_daemonize(&child_ppid
, &recv_child_signal
,
5877 !config
.background
);
5884 * We are in the child. Make sure all other file descriptors are
5885 * closed, in case we are called with more opened file
5886 * descriptors than the standard ones and the lock file.
5888 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
5889 if (i
== lockfile_fd
) {
5896 if (run_as_create_worker(argv
[0]) < 0) {
5897 goto exit_create_run_as_worker_cleanup
;
5901 * Starting from here, we can create threads. This needs to be after
5902 * lttng_daemonize due to RCU.
5906 * Initialize the health check subsystem. This call should set the
5907 * appropriate time values.
5909 health_sessiond
= health_app_create(NR_HEALTH_SESSIOND_TYPES
);
5910 if (!health_sessiond
) {
5911 PERROR("health_app_create error");
5913 goto exit_health_sessiond_cleanup
;
5916 /* Create thread to clean up RCU hash tables */
5917 if (init_ht_cleanup_thread(&ht_cleanup_thread
)) {
5919 goto exit_ht_cleanup
;
5922 /* Create thread quit pipe */
5923 if (init_thread_quit_pipe()) {
5925 goto exit_init_data
;
5928 /* Check if daemon is UID = 0 */
5929 is_root
= !getuid();
5931 /* Create global run dir with root access */
5933 kernel_channel_monitor_pipe
= lttng_pipe_open(0);
5934 if (!kernel_channel_monitor_pipe
) {
5935 ERR("Failed to create kernel consumer channel monitor pipe");
5937 goto exit_init_data
;
5939 kconsumer_data
.channel_monitor_pipe
=
5940 lttng_pipe_release_writefd(
5941 kernel_channel_monitor_pipe
);
5942 if (kconsumer_data
.channel_monitor_pipe
< 0) {
5944 goto exit_init_data
;
5946 kernel_channel_rotate_pipe
= lttng_pipe_open(0);
5947 if (!kernel_channel_rotate_pipe
) {
5948 ERR("Failed to create kernel consumer channel rotate pipe");
5950 goto exit_init_data
;
5952 kconsumer_data
.channel_rotate_pipe
=
5953 lttng_pipe_release_writefd(
5954 kernel_channel_rotate_pipe
);
5955 if (kconsumer_data
.channel_rotate_pipe
< 0) {
5957 goto exit_init_data
;
5961 /* Set consumer initial state */
5962 kernel_consumerd_state
= CONSUMER_STOPPED
;
5963 ust_consumerd_state
= CONSUMER_STOPPED
;
5965 ust32_channel_monitor_pipe
= lttng_pipe_open(0);
5966 if (!ust32_channel_monitor_pipe
) {
5967 ERR("Failed to create 32-bit user space consumer channel monitor pipe");
5969 goto exit_init_data
;
5971 ustconsumer32_data
.channel_monitor_pipe
= lttng_pipe_release_writefd(
5972 ust32_channel_monitor_pipe
);
5973 if (ustconsumer32_data
.channel_monitor_pipe
< 0) {
5975 goto exit_init_data
;
5977 ust32_channel_rotate_pipe
= lttng_pipe_open(0);
5978 if (!ust32_channel_rotate_pipe
) {
5979 ERR("Failed to create 32-bit user space consumer channel rotate pipe");
5981 goto exit_init_data
;
5983 ustconsumer32_data
.channel_rotate_pipe
= lttng_pipe_release_writefd(
5984 ust32_channel_rotate_pipe
);
5985 if (ustconsumer32_data
.channel_rotate_pipe
< 0) {
5987 goto exit_init_data
;
5991 * The rotation_timer_queue structure is shared between the sessiond timer
5992 * thread and the rotation thread. The main() keeps the ownership and
5993 * destroys it when both threads have quit.
5995 rotation_timer_queue
= create_rotate_timer_queue();
5996 if (!rotation_timer_queue
) {
5998 goto exit_init_data
;
6000 timer_thread_ctx
.rotation_timer_queue
= rotation_timer_queue
;
6002 ust64_channel_monitor_pipe
= lttng_pipe_open(0);
6003 if (!ust64_channel_monitor_pipe
) {
6004 ERR("Failed to create 64-bit user space consumer channel monitor pipe");
6006 goto exit_init_data
;
6008 ustconsumer64_data
.channel_monitor_pipe
= lttng_pipe_release_writefd(
6009 ust64_channel_monitor_pipe
);
6010 if (ustconsumer64_data
.channel_monitor_pipe
< 0) {
6012 goto exit_init_data
;
6014 ust64_channel_rotate_pipe
= lttng_pipe_open(0);
6015 if (!ust64_channel_rotate_pipe
) {
6016 ERR("Failed to create 64-bit user space consumer channel rotate pipe");
6018 goto exit_init_data
;
6020 ustconsumer64_data
.channel_rotate_pipe
= lttng_pipe_release_writefd(
6021 ust64_channel_rotate_pipe
);
6022 if (ustconsumer64_data
.channel_rotate_pipe
< 0) {
6024 goto exit_init_data
;
6028 * Init UST app hash table. Alloc hash table before this point since
6029 * cleanup() can get called after that point.
6031 if (ust_app_ht_alloc()) {
6032 ERR("Failed to allocate UST app hash table");
6034 goto exit_init_data
;
6038 * Initialize agent app hash table. We allocate the hash table here
6039 * since cleanup() can get called after this point.
6041 if (agent_app_ht_alloc()) {
6042 ERR("Failed to allocate Agent app hash table");
6044 goto exit_init_data
;
6048 * These actions must be executed as root. We do that *after* setting up
6049 * the sockets path because we MUST make the check for another daemon using
6050 * those paths *before* trying to set the kernel consumer sockets and init
6054 if (set_consumer_sockets(&kconsumer_data
)) {
6056 goto exit_init_data
;
6059 /* Setup kernel tracer */
6060 if (!config
.no_kernel
) {
6061 init_kernel_tracer();
6062 if (kernel_tracer_fd
>= 0) {
6063 ret
= syscall_init_table();
6065 ERR("Unable to populate syscall table. "
6066 "Syscall tracing won't work "
6067 "for this session daemon.");
6072 /* Set ulimit for open files */
6075 /* init lttng_fd tracking must be done after set_ulimit. */
6078 if (set_consumer_sockets(&ustconsumer64_data
)) {
6080 goto exit_init_data
;
6083 if (set_consumer_sockets(&ustconsumer32_data
)) {
6085 goto exit_init_data
;
6088 /* Setup the needed unix socket */
6089 if (init_daemon_socket()) {
6091 goto exit_init_data
;
6094 /* Set credentials to socket */
6095 if (is_root
&& set_permissions(config
.rundir
.value
)) {
6097 goto exit_init_data
;
6100 /* Get parent pid if -S, --sig-parent is specified. */
6101 if (config
.sig_parent
) {
6105 /* Setup the kernel pipe for waking up the kernel thread */
6106 if (is_root
&& !config
.no_kernel
) {
6107 if (utils_create_pipe_cloexec(kernel_poll_pipe
)) {
6109 goto exit_init_data
;
6113 /* Setup the thread apps communication pipe. */
6114 if (utils_create_pipe_cloexec(apps_cmd_pipe
)) {
6116 goto exit_init_data
;
6119 /* Setup the thread apps notify communication pipe. */
6120 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe
)) {
6122 goto exit_init_data
;
6125 /* Initialize global buffer per UID and PID registry. */
6126 buffer_reg_init_uid_registry();
6127 buffer_reg_init_pid_registry();
6129 /* Init UST command queue. */
6130 cds_wfcq_init(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
);
6133 * Get session list pointer. This pointer MUST NOT be free'd. This list
6134 * is statically declared in session.c
6136 session_list_ptr
= session_get_list();
6140 /* Check for the application socket timeout env variable. */
6141 env_app_timeout
= getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV
);
6142 if (env_app_timeout
) {
6143 config
.app_socket_timeout
= atoi(env_app_timeout
);
6145 config
.app_socket_timeout
= DEFAULT_APP_SOCKET_RW_TIMEOUT
;
6148 ret
= write_pidfile();
6150 ERR("Error in write_pidfile");
6152 goto exit_init_data
;
6155 /* Initialize communication library */
6157 /* Initialize TCP timeout values */
6158 lttcomm_inet_init();
6160 if (load_session_init_data(&load_info
) < 0) {
6162 goto exit_init_data
;
6164 load_info
->path
= config
.load_session_path
.value
;
6166 /* Create health-check thread. */
6167 ret
= pthread_create(&health_thread
, default_pthread_attr(),
6168 thread_manage_health
, (void *) NULL
);
6171 PERROR("pthread_create health");
6177 * The rotation thread needs the notification thread to be ready before
6178 * creating the rotate_notification_channel, so we use this semaphore as
6179 * a rendez-vous point.
6181 sem_init(¬ification_thread_ready
, 0, 0);
6183 /* notification_thread_data acquires the pipes' read side. */
6184 notification_thread_handle
= notification_thread_handle_create(
6185 ust32_channel_monitor_pipe
,
6186 ust64_channel_monitor_pipe
,
6187 kernel_channel_monitor_pipe
,
6188 ¬ification_thread_ready
);
6189 if (!notification_thread_handle
) {
6191 ERR("Failed to create notification thread shared data");
6193 goto exit_notification
;
6196 /* Create notification thread. */
6197 ret
= pthread_create(¬ification_thread
, default_pthread_attr(),
6198 thread_notification
, notification_thread_handle
);
6201 PERROR("pthread_create notification");
6204 goto exit_notification
;
6206 notification_thread_launched
= true;
6208 /* Create timer thread. */
6209 ret
= pthread_create(&timer_thread
, default_pthread_attr(),
6210 sessiond_timer_thread
, &timer_thread_ctx
);
6213 PERROR("pthread_create timer");
6216 goto exit_notification
;
6218 timer_thread_launched
= true;
6220 /* rotation_thread_data acquires the pipes' read side. */
6221 rotation_thread_handle
= rotation_thread_handle_create(
6222 ust32_channel_rotate_pipe
,
6223 ust64_channel_rotate_pipe
,
6224 kernel_channel_rotate_pipe
,
6225 thread_quit_pipe
[0],
6226 rotation_timer_queue
,
6227 notification_thread_handle
,
6228 ¬ification_thread_ready
);
6229 if (!rotation_thread_handle
) {
6231 ERR("Failed to create rotation thread shared data");
6236 /* Create rotation thread. */
6237 ret
= pthread_create(&rotation_thread
, default_pthread_attr(),
6238 thread_rotation
, rotation_thread_handle
);
6241 PERROR("pthread_create rotation");
6246 rotation_thread_launched
= true;
6248 /* Create thread to manage the client socket */
6249 ret
= pthread_create(&client_thread
, default_pthread_attr(),
6250 thread_manage_clients
, (void *) NULL
);
6253 PERROR("pthread_create clients");
6259 /* Create thread to dispatch registration */
6260 ret
= pthread_create(&dispatch_thread
, default_pthread_attr(),
6261 thread_dispatch_ust_registration
, (void *) NULL
);
6264 PERROR("pthread_create dispatch");
6270 /* Create thread to manage application registration. */
6271 ret
= pthread_create(®_apps_thread
, default_pthread_attr(),
6272 thread_registration_apps
, (void *) NULL
);
6275 PERROR("pthread_create registration");
6281 /* Create thread to manage application socket */
6282 ret
= pthread_create(&apps_thread
, default_pthread_attr(),
6283 thread_manage_apps
, (void *) NULL
);
6286 PERROR("pthread_create apps");
6292 /* Create thread to manage application notify socket */
6293 ret
= pthread_create(&apps_notify_thread
, default_pthread_attr(),
6294 ust_thread_manage_notify
, (void *) NULL
);
6297 PERROR("pthread_create notify");
6300 goto exit_apps_notify
;
6303 /* Create agent registration thread. */
6304 ret
= pthread_create(&agent_reg_thread
, default_pthread_attr(),
6305 agent_thread_manage_registration
, (void *) NULL
);
6308 PERROR("pthread_create agent");
6311 goto exit_agent_reg
;
6314 /* Don't start this thread if kernel tracing is not requested nor root */
6315 if (is_root
&& !config
.no_kernel
) {
6316 /* Create kernel thread to manage kernel event */
6317 ret
= pthread_create(&kernel_thread
, default_pthread_attr(),
6318 thread_manage_kernel
, (void *) NULL
);
6321 PERROR("pthread_create kernel");
6328 /* Create session loading thread. */
6329 ret
= pthread_create(&load_session_thread
, default_pthread_attr(),
6330 thread_load_session
, load_info
);
6333 PERROR("pthread_create load_session_thread");
6336 goto exit_load_session
;
6340 * This is where we start awaiting program completion (e.g. through
6341 * signal that asks threads to teardown).
6344 ret
= pthread_join(load_session_thread
, &status
);
6347 PERROR("pthread_join load_session_thread");
6352 if (is_root
&& !config
.no_kernel
) {
6353 ret
= pthread_join(kernel_thread
, &status
);
6356 PERROR("pthread_join");
6362 ret
= pthread_join(agent_reg_thread
, &status
);
6365 PERROR("pthread_join agent");
6370 ret
= pthread_join(apps_notify_thread
, &status
);
6373 PERROR("pthread_join apps notify");
6378 ret
= pthread_join(apps_thread
, &status
);
6381 PERROR("pthread_join apps");
6386 ret
= pthread_join(reg_apps_thread
, &status
);
6389 PERROR("pthread_join");
6395 * Join dispatch thread after joining reg_apps_thread to ensure
6396 * we don't leak applications in the queue.
6398 ret
= pthread_join(dispatch_thread
, &status
);
6401 PERROR("pthread_join");
6406 ret
= pthread_join(client_thread
, &status
);
6409 PERROR("pthread_join");
6416 sem_destroy(¬ification_thread_ready
);
6417 ret
= pthread_join(health_thread
, &status
);
6420 PERROR("pthread_join health thread");
6427 * Wait for all pending call_rcu work to complete before tearing
6428 * down data structures. call_rcu worker may be trying to
6429 * perform lookups in those structures.
6433 * sessiond_cleanup() is called when no other thread is running, except
6434 * the ht_cleanup thread, which is needed to destroy the hash tables.
6436 rcu_thread_online();
6440 * Ensure all prior call_rcu are done. call_rcu callbacks may push
6441 * hash tables to the ht_cleanup thread. Therefore, we ensure that
6442 * the queue is empty before shutting down the clean-up thread.
6447 * The teardown of the notification system is performed after the
6448 * session daemon's teardown in order to allow it to be notified
6449 * of the active session and channels at the moment of the teardown.
6451 if (notification_thread_handle
) {
6452 if (notification_thread_launched
) {
6453 notification_thread_command_quit(
6454 notification_thread_handle
);
6455 ret
= pthread_join(notification_thread
, &status
);
6458 PERROR("pthread_join notification thread");
6462 notification_thread_handle_destroy(notification_thread_handle
);
6465 if (rotation_thread_handle
) {
6466 if (rotation_thread_launched
) {
6467 ret
= pthread_join(rotation_thread
, &status
);
6470 PERROR("pthread_join rotation thread");
6474 rotation_thread_handle_destroy(rotation_thread_handle
);
6477 if (timer_thread_launched
) {
6478 kill(getpid(), LTTNG_SESSIOND_SIG_EXIT
);
6479 ret
= pthread_join(timer_thread
, &status
);
6482 PERROR("pthread_join timer thread");
6488 * After the rotation and timer thread have quit, we can safely destroy
6489 * the rotation_timer_queue.
6491 destroy_rotate_timer_queue(rotation_timer_queue
);
6493 rcu_thread_offline();
6494 rcu_unregister_thread();
6496 ret
= fini_ht_cleanup_thread(&ht_cleanup_thread
);
6500 lttng_pipe_destroy(ust32_channel_monitor_pipe
);
6501 lttng_pipe_destroy(ust64_channel_monitor_pipe
);
6502 lttng_pipe_destroy(kernel_channel_monitor_pipe
);
6503 lttng_pipe_destroy(ust32_channel_rotate_pipe
);
6504 lttng_pipe_destroy(ust64_channel_rotate_pipe
);
6505 lttng_pipe_destroy(kernel_channel_rotate_pipe
);
6508 health_app_destroy(health_sessiond
);
6509 exit_health_sessiond_cleanup
:
6510 exit_create_run_as_worker_cleanup
:
6513 sessiond_cleanup_lock_file();
6514 sessiond_cleanup_options();
6516 exit_set_signal_handler
: