2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
25 #include <semaphore.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
35 #include <sys/types.h>
37 #include <urcu/futex.h>
41 #include <lttng-consumerd.h>
42 #include <lttng-sessiond-comm.h>
43 #include <lttng/lttng-consumer.h>
48 #include "compat/poll.h"
52 #include "hashtable.h"
53 #include "kernel-ctl.h"
54 #include "lttng-sessiond.h"
60 struct consumer_data
{
61 enum lttng_consumer_type type
;
63 pthread_t thread
; /* Worker thread interacting with the consumer */
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex
;
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path
[PATH_MAX
];
75 char cmd_unix_sock_path
[PATH_MAX
];
79 const char default_home_dir
[] = DEFAULT_HOME_DIR
;
80 const char default_tracing_group
[] = LTTNG_DEFAULT_TRACING_GROUP
;
81 const char default_ust_sock_dir
[] = DEFAULT_UST_SOCK_DIR
;
82 const char default_global_apps_pipe
[] = DEFAULT_GLOBAL_APPS_PIPE
;
85 int opt_verbose
; /* Not static for lttngerr.h */
86 int opt_verbose_consumer
; /* Not static for lttngerr.h */
87 int opt_quiet
; /* Not static for lttngerr.h */
90 const char *opt_tracing_group
;
91 static int opt_sig_parent
;
92 static int opt_daemon
;
93 static int is_root
; /* Set to 1 if the daemon is running as root */
94 static pid_t ppid
; /* Parent PID for --sig-parent option */
96 /* Consumer daemon specific control data */
97 static struct consumer_data kconsumer_data
= {
98 .type
= LTTNG_CONSUMER_KERNEL
,
100 static struct consumer_data ustconsumer_data
= {
101 .type
= LTTNG_CONSUMER_UST
,
104 static int dispatch_thread_exit
;
106 /* Global application Unix socket path */
107 static char apps_unix_sock_path
[PATH_MAX
];
108 /* Global client Unix socket path */
109 static char client_unix_sock_path
[PATH_MAX
];
110 /* global wait shm path for UST */
111 static char wait_shm_path
[PATH_MAX
];
113 /* Sockets and FDs */
114 static int client_sock
;
115 static int apps_sock
;
116 static int kernel_tracer_fd
;
117 static int kernel_poll_pipe
[2];
120 * Quit pipe for all threads. This permits a single cancellation point
121 * for all threads when receiving an event on the pipe.
123 static int thread_quit_pipe
[2];
126 * This pipe is used to inform the thread managing application communication
127 * that a command is queued and ready to be processed.
129 static int apps_cmd_pipe
[2];
131 /* Pthread, Mutexes and Semaphores */
132 static pthread_t apps_thread
;
133 static pthread_t reg_apps_thread
;
134 static pthread_t client_thread
;
135 static pthread_t kernel_thread
;
136 static pthread_t dispatch_thread
;
140 * UST registration command queue. This queue is tied with a futex and uses a N
141 * wakers / 1 waiter implemented and detailed in futex.c/.h
143 * The thread_manage_apps and thread_dispatch_ust_registration interact with
144 * this queue and the wait/wake scheme.
146 static struct ust_cmd_queue ust_cmd_queue
;
149 * Pointer initialized before thread creation.
151 * This points to the tracing session list containing the session count and a
152 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
153 * MUST NOT be taken if you call a public function in session.c.
155 * The lock is nested inside the structure: session_list_ptr->lock. Please use
156 * session_lock_list and session_unlock_list for lock acquisition.
158 static struct ltt_session_list
*session_list_ptr
;
161 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
163 static int create_thread_poll_set(struct lttng_poll_event
*events
,
168 if (events
== NULL
|| size
== 0) {
173 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
179 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
191 * Check if the thread quit pipe was triggered.
193 * Return 1 if it was triggered else 0;
195 static int check_thread_quit_pipe(int fd
, uint32_t events
)
197 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
205 * Remove modules in reverse load order.
207 static int modprobe_remove_kernel_modules(void)
212 for (i
= ARRAY_SIZE(kernel_modules_list
) - 1; i
>= 0; i
--) {
213 ret
= snprintf(modprobe
, sizeof(modprobe
),
214 "/sbin/modprobe -r -q %s",
215 kernel_modules_list
[i
].name
);
217 perror("snprintf modprobe -r");
220 modprobe
[sizeof(modprobe
) - 1] = '\0';
221 ret
= system(modprobe
);
223 ERR("Unable to launch modprobe -r for module %s",
224 kernel_modules_list
[i
].name
);
225 } else if (kernel_modules_list
[i
].required
226 && WEXITSTATUS(ret
) != 0) {
227 ERR("Unable to remove module %s",
228 kernel_modules_list
[i
].name
);
230 DBG("Modprobe removal successful %s",
231 kernel_modules_list
[i
].name
);
240 * Return group ID of the tracing group or -1 if not found.
242 static gid_t
allowed_group(void)
246 if (opt_tracing_group
) {
247 grp
= getgrnam(opt_tracing_group
);
249 grp
= getgrnam(default_tracing_group
);
259 * Init thread quit pipe.
261 * Return -1 on error or 0 if all pipes are created.
263 static int init_thread_quit_pipe(void)
267 ret
= pipe2(thread_quit_pipe
, O_CLOEXEC
);
269 perror("thread quit pipe");
278 * Complete teardown of a kernel session. This free all data structure related
279 * to a kernel session and update counter.
281 static void teardown_kernel_session(struct ltt_session
*session
)
283 if (session
->kernel_session
!= NULL
) {
284 DBG("Tearing down kernel session");
287 * If a custom kernel consumer was registered, close the socket before
288 * tearing down the complete kernel session structure
290 if (session
->kernel_session
->consumer_fd
!= kconsumer_data
.cmd_sock
) {
291 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
294 trace_kernel_destroy_session(session
->kernel_session
);
295 /* Extra precaution */
296 session
->kernel_session
= NULL
;
301 * Complete teardown of all UST sessions. This will free everything on his path
302 * and destroy the core essence of all ust sessions :)
304 static void teardown_ust_session(struct ltt_session
*session
)
306 DBG("Tearing down UST session(s)");
308 trace_ust_destroy_session(session
->ust_session
);
312 * Stop all threads by closing the thread quit pipe.
314 static void stop_threads(void)
318 /* Stopping all threads */
319 DBG("Terminating all threads");
320 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
322 ERR("write error on thread quit pipe");
325 /* Dispatch thread */
326 dispatch_thread_exit
= 1;
327 futex_nto1_wake(&ust_cmd_queue
.futex
);
333 static void cleanup(void)
337 struct ltt_session
*sess
, *stmp
;
342 MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm"
343 "Matthew, BEET driven development works!%c[%dm",
344 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
348 DBG("Removing %s directory", LTTNG_RUNDIR
);
349 ret
= asprintf(&cmd
, "rm -rf " LTTNG_RUNDIR
);
351 ERR("asprintf failed. Something is really wrong!");
354 /* Remove lttng run directory */
357 ERR("Unable to clean " LTTNG_RUNDIR
);
361 DBG("Cleaning up all session");
363 /* Destroy session list mutex */
364 if (session_list_ptr
!= NULL
) {
365 pthread_mutex_destroy(&session_list_ptr
->lock
);
367 /* Cleanup ALL session */
368 cds_list_for_each_entry_safe(sess
, stmp
,
369 &session_list_ptr
->head
, list
) {
370 teardown_kernel_session(sess
);
371 teardown_ust_session(sess
);
376 DBG("Closing all UST sockets");
377 ust_app_clean_list();
379 pthread_mutex_destroy(&kconsumer_data
.pid_mutex
);
381 DBG("Closing kernel fd");
382 close(kernel_tracer_fd
);
385 DBG("Unloading kernel modules");
386 modprobe_remove_kernel_modules();
389 close(thread_quit_pipe
[0]);
390 close(thread_quit_pipe
[1]);
394 * Send data on a unix socket using the liblttsessiondcomm API.
396 * Return lttcomm error code.
398 static int send_unix_sock(int sock
, void *buf
, size_t len
)
400 /* Check valid length */
405 return lttcomm_send_unix_sock(sock
, buf
, len
);
409 * Free memory of a command context structure.
411 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
413 DBG("Clean command context structure");
415 if ((*cmd_ctx
)->llm
) {
416 free((*cmd_ctx
)->llm
);
418 if ((*cmd_ctx
)->lsm
) {
419 free((*cmd_ctx
)->lsm
);
427 * Send all stream fds of kernel channel to the consumer.
429 static int send_kconsumer_channel_streams(struct consumer_data
*consumer_data
,
430 int sock
, struct ltt_kernel_channel
*channel
)
433 struct ltt_kernel_stream
*stream
;
434 struct lttcomm_consumer_msg lkm
;
436 DBG("Sending streams of channel %s to kernel consumer",
437 channel
->channel
->name
);
440 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
441 lkm
.u
.channel
.channel_key
= channel
->fd
;
442 lkm
.u
.channel
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
443 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
444 DBG("Sending channel %d to consumer", lkm
.u
.channel
.channel_key
);
445 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
447 perror("send consumer channel");
452 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
456 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
457 lkm
.u
.stream
.channel_key
= channel
->fd
;
458 lkm
.u
.stream
.stream_key
= stream
->fd
;
459 lkm
.u
.stream
.state
= stream
->state
;
460 lkm
.u
.stream
.output
= channel
->channel
->attr
.output
;
461 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
462 strncpy(lkm
.u
.stream
.path_name
, stream
->pathname
, PATH_MAX
- 1);
463 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
464 DBG("Sending stream %d to consumer", lkm
.u
.stream
.stream_key
);
465 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
467 perror("send consumer stream");
470 ret
= lttcomm_send_fds_unix_sock(sock
, &stream
->fd
, 1);
472 perror("send consumer stream ancillary data");
477 DBG("consumer channel streams sent");
486 * Send all stream fds of the kernel session to the consumer.
488 static int send_kconsumer_session_streams(struct consumer_data
*consumer_data
,
489 struct ltt_kernel_session
*session
)
492 struct ltt_kernel_channel
*chan
;
493 struct lttcomm_consumer_msg lkm
;
494 int sock
= session
->consumer_fd
;
496 DBG("Sending metadata stream fd");
498 /* Extra protection. It's NOT supposed to be set to 0 at this point */
499 if (session
->consumer_fd
== 0) {
500 session
->consumer_fd
= consumer_data
->cmd_sock
;
503 if (session
->metadata_stream_fd
!= 0) {
504 /* Send metadata channel fd */
505 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
506 lkm
.u
.channel
.channel_key
= session
->metadata
->fd
;
507 lkm
.u
.channel
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
508 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
509 DBG("Sending metadata channel %d to consumer", lkm
.u
.stream
.stream_key
);
510 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
512 perror("send consumer channel");
516 /* Send metadata stream fd */
517 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
518 lkm
.u
.stream
.channel_key
= session
->metadata
->fd
;
519 lkm
.u
.stream
.stream_key
= session
->metadata_stream_fd
;
520 lkm
.u
.stream
.state
= LTTNG_CONSUMER_ACTIVE_STREAM
;
521 lkm
.u
.stream
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
522 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
523 strncpy(lkm
.u
.stream
.path_name
, session
->metadata
->pathname
, PATH_MAX
- 1);
524 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
525 DBG("Sending metadata stream %d to consumer", lkm
.u
.stream
.stream_key
);
526 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
528 perror("send consumer stream");
531 ret
= lttcomm_send_fds_unix_sock(sock
, &session
->metadata_stream_fd
, 1);
533 perror("send consumer stream");
538 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
539 ret
= send_kconsumer_channel_streams(consumer_data
, sock
, chan
);
545 DBG("consumer fds (metadata and channel streams) sent");
554 * Notify UST applications using the shm mmap futex.
556 static int notify_ust_apps(int active
)
560 DBG("Notifying applications of session daemon state: %d", active
);
562 /* See shm.c for this call implying mmap, shm and futex calls */
563 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
564 if (wait_shm_mmap
== NULL
) {
568 /* Wake waiting process */
569 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
571 /* Apps notified successfully */
579 * Setup the outgoing data buffer for the response (llm) by allocating the
580 * right amount of memory and copying the original information from the lsm
583 * Return total size of the buffer pointed by buf.
585 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
591 cmd_ctx
->llm
= malloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
592 if (cmd_ctx
->llm
== NULL
) {
598 /* Copy common data */
599 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
600 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
602 cmd_ctx
->llm
->data_size
= size
;
603 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
612 * Update the kernel poll set of all channel fd available over all tracing
613 * session. Add the wakeup pipe at the end of the set.
615 static int update_kernel_poll(struct lttng_poll_event
*events
)
618 struct ltt_session
*session
;
619 struct ltt_kernel_channel
*channel
;
621 DBG("Updating kernel poll set");
624 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
625 session_lock(session
);
626 if (session
->kernel_session
== NULL
) {
627 session_unlock(session
);
631 cds_list_for_each_entry(channel
,
632 &session
->kernel_session
->channel_list
.head
, list
) {
633 /* Add channel fd to the kernel poll set */
634 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
636 session_unlock(session
);
639 DBG("Channel fd %d added to kernel set", channel
->fd
);
641 session_unlock(session
);
643 session_unlock_list();
648 session_unlock_list();
653 * Find the channel fd from 'fd' over all tracing session. When found, check
654 * for new channel stream and send those stream fds to the kernel consumer.
656 * Useful for CPU hotplug feature.
658 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
661 struct ltt_session
*session
;
662 struct ltt_kernel_channel
*channel
;
664 DBG("Updating kernel streams for channel fd %d", fd
);
667 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
668 session_lock(session
);
669 if (session
->kernel_session
== NULL
) {
670 session_unlock(session
);
674 /* This is not suppose to be 0 but this is an extra security check */
675 if (session
->kernel_session
->consumer_fd
== 0) {
676 session
->kernel_session
->consumer_fd
= consumer_data
->cmd_sock
;
679 cds_list_for_each_entry(channel
,
680 &session
->kernel_session
->channel_list
.head
, list
) {
681 if (channel
->fd
== fd
) {
682 DBG("Channel found, updating kernel streams");
683 ret
= kernel_open_channel_stream(channel
);
689 * Have we already sent fds to the consumer? If yes, it means
690 * that tracing is started so it is safe to send our updated
693 if (session
->kernel_session
->consumer_fds_sent
== 1) {
694 ret
= send_kconsumer_channel_streams(consumer_data
,
695 session
->kernel_session
->consumer_fd
, channel
);
703 session_unlock(session
);
705 session_unlock_list();
709 session_unlock(session
);
710 session_unlock_list();
715 * This thread manage event coming from the kernel.
717 * Features supported in this thread:
720 static void *thread_manage_kernel(void *data
)
722 int ret
, i
, pollfd
, update_poll_flag
= 1;
723 uint32_t revents
, nb_fd
;
725 struct lttng_poll_event events
;
727 DBG("Thread manage kernel started");
729 ret
= create_thread_poll_set(&events
, 2);
734 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
740 if (update_poll_flag
== 1) {
742 * Reset number of fd in the poll set. Always 2 since there is the thread
743 * quit pipe and the kernel pipe.
747 ret
= update_kernel_poll(&events
);
751 update_poll_flag
= 0;
754 nb_fd
= LTTNG_POLL_GETNB(&events
);
756 DBG("Thread kernel polling on %d fds", nb_fd
);
758 /* Zeroed the poll events */
759 lttng_poll_reset(&events
);
761 /* Poll infinite value of time */
762 ret
= lttng_poll_wait(&events
, -1);
765 } else if (ret
== 0) {
766 /* Should not happen since timeout is infinite */
767 ERR("Return value of poll is 0 with an infinite timeout.\n"
768 "This should not have happened! Continuing...");
772 for (i
= 0; i
< nb_fd
; i
++) {
773 /* Fetch once the poll data */
774 revents
= LTTNG_POLL_GETEV(&events
, i
);
775 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
777 /* Thread quit pipe has been closed. Killing thread. */
778 ret
= check_thread_quit_pipe(pollfd
, revents
);
783 /* Check for data on kernel pipe */
784 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
785 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
786 update_poll_flag
= 1;
790 * New CPU detected by the kernel. Adding kernel stream to
791 * kernel session and updating the kernel consumer
793 if (revents
& LPOLLIN
) {
794 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
800 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
801 * and unregister kernel stream at this point.
809 DBG("Kernel thread dying");
810 close(kernel_poll_pipe
[0]);
811 close(kernel_poll_pipe
[1]);
813 lttng_poll_clean(&events
);
819 * This thread manage the consumer error sent back to the session daemon.
821 static void *thread_manage_consumer(void *data
)
823 int sock
= 0, i
, ret
, pollfd
;
824 uint32_t revents
, nb_fd
;
825 enum lttcomm_return_code code
;
826 struct lttng_poll_event events
;
827 struct consumer_data
*consumer_data
= data
;
829 DBG("[thread] Manage consumer started");
831 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
837 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
838 * Nothing more will be added to this poll set.
840 ret
= create_thread_poll_set(&events
, 2);
845 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
850 nb_fd
= LTTNG_POLL_GETNB(&events
);
852 /* Inifinite blocking call, waiting for transmission */
853 ret
= lttng_poll_wait(&events
, -1);
858 for (i
= 0; i
< nb_fd
; i
++) {
859 /* Fetch once the poll data */
860 revents
= LTTNG_POLL_GETEV(&events
, i
);
861 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
863 /* Thread quit pipe has been closed. Killing thread. */
864 ret
= check_thread_quit_pipe(pollfd
, revents
);
869 /* Event on the registration socket */
870 if (pollfd
== consumer_data
->err_sock
) {
871 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
872 ERR("consumer err socket poll error");
878 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
883 DBG2("Receiving code from consumer err_sock");
885 /* Getting status code from kconsumerd */
886 ret
= lttcomm_recv_unix_sock(sock
, &code
,
887 sizeof(enum lttcomm_return_code
));
892 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
893 consumer_data
->cmd_sock
=
894 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
895 if (consumer_data
->cmd_sock
< 0) {
896 sem_post(&consumer_data
->sem
);
897 PERROR("consumer connect");
900 /* Signal condition to tell that the kconsumerd is ready */
901 sem_post(&consumer_data
->sem
);
902 DBG("consumer command socket ready");
904 ERR("consumer error when waiting for SOCK_READY : %s",
905 lttcomm_get_readable_code(-code
));
909 /* Remove the kconsumerd error sock since we've established a connexion */
910 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
915 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
920 /* Update number of fd */
921 nb_fd
= LTTNG_POLL_GETNB(&events
);
923 /* Inifinite blocking call, waiting for transmission */
924 ret
= lttng_poll_wait(&events
, -1);
929 for (i
= 0; i
< nb_fd
; i
++) {
930 /* Fetch once the poll data */
931 revents
= LTTNG_POLL_GETEV(&events
, i
);
932 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
934 /* Thread quit pipe has been closed. Killing thread. */
935 ret
= check_thread_quit_pipe(pollfd
, revents
);
940 /* Event on the kconsumerd socket */
941 if (pollfd
== sock
) {
942 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
943 ERR("consumer err socket second poll error");
949 /* Wait for any kconsumerd error */
950 ret
= lttcomm_recv_unix_sock(sock
, &code
,
951 sizeof(enum lttcomm_return_code
));
953 ERR("consumer closed the command socket");
957 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
960 DBG("consumer thread dying");
961 close(consumer_data
->err_sock
);
962 close(consumer_data
->cmd_sock
);
965 unlink(consumer_data
->err_unix_sock_path
);
966 unlink(consumer_data
->cmd_unix_sock_path
);
967 consumer_data
->pid
= 0;
969 lttng_poll_clean(&events
);
975 * This thread manage application communication.
977 static void *thread_manage_apps(void *data
)
980 uint32_t revents
, nb_fd
;
981 struct ust_command ust_cmd
;
982 struct lttng_poll_event events
;
984 DBG("[thread] Manage application started");
986 rcu_register_thread();
989 ret
= create_thread_poll_set(&events
, 2);
994 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1000 /* Zeroed the events structure */
1001 lttng_poll_reset(&events
);
1003 nb_fd
= LTTNG_POLL_GETNB(&events
);
1005 DBG("Apps thread polling on %d fds", nb_fd
);
1007 /* Inifinite blocking call, waiting for transmission */
1008 ret
= lttng_poll_wait(&events
, -1);
1013 for (i
= 0; i
< nb_fd
; i
++) {
1014 /* Fetch once the poll data */
1015 revents
= LTTNG_POLL_GETEV(&events
, i
);
1016 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1018 /* Thread quit pipe has been closed. Killing thread. */
1019 ret
= check_thread_quit_pipe(pollfd
, revents
);
1024 /* Inspect the apps cmd pipe */
1025 if (pollfd
== apps_cmd_pipe
[0]) {
1026 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1027 ERR("Apps command pipe error");
1029 } else if (revents
& LPOLLIN
) {
1031 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1032 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1033 perror("read apps cmd pipe");
1037 /* Register applicaton to the session daemon */
1038 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1041 /* Only critical ENOMEM error can be returned here */
1045 ret
= ustctl_register_done(ust_cmd
.sock
);
1048 * If the registration is not possible, we simply
1049 * unregister the apps and continue
1051 ust_app_unregister(ust_cmd
.sock
);
1054 * We just need here to monitor the close of the UST
1055 * socket and poll set monitor those by default.
1057 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, 0);
1062 DBG("Apps with sock %d added to poll set",
1069 * At this point, we know that a registered application made
1070 * the event at poll_wait.
1072 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1073 /* Removing from the poll set */
1074 ret
= lttng_poll_del(&events
, pollfd
);
1080 ust_app_unregister(pollfd
);
1088 DBG("Application communication apps dying");
1089 close(apps_cmd_pipe
[0]);
1090 close(apps_cmd_pipe
[1]);
1092 lttng_poll_clean(&events
);
1094 rcu_thread_offline();
1095 rcu_unregister_thread();
1100 * Dispatch request from the registration threads to the application
1101 * communication thread.
1103 static void *thread_dispatch_ust_registration(void *data
)
1106 struct cds_wfq_node
*node
;
1107 struct ust_command
*ust_cmd
= NULL
;
1109 DBG("[thread] Dispatch UST command started");
1111 while (!dispatch_thread_exit
) {
1112 /* Atomically prepare the queue futex */
1113 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1116 /* Dequeue command for registration */
1117 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1119 DBG("Woken up but nothing in the UST command queue");
1120 /* Continue thread execution */
1124 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1126 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1127 " gid:%d sock:%d name:%s (version %d.%d)",
1128 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1129 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1130 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1131 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1133 * Inform apps thread of the new application registration. This
1134 * call is blocking so we can be assured that the data will be read
1135 * at some point in time or wait to the end of the world :)
1137 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1138 sizeof(struct ust_command
));
1140 perror("write apps cmd pipe");
1141 if (errno
== EBADF
) {
1143 * We can't inform the application thread to process
1144 * registration. We will exit or else application
1145 * registration will not occur and tracing will never
1152 } while (node
!= NULL
);
1154 /* Futex wait on queue. Blocking call on futex() */
1155 futex_nto1_wait(&ust_cmd_queue
.futex
);
1159 DBG("Dispatch thread dying");
1164 * This thread manage application registration.
1166 static void *thread_registration_apps(void *data
)
1168 int sock
= 0, i
, ret
, pollfd
;
1169 uint32_t revents
, nb_fd
;
1170 struct lttng_poll_event events
;
1172 * Get allocated in this thread, enqueued to a global queue, dequeued and
1173 * freed in the manage apps thread.
1175 struct ust_command
*ust_cmd
= NULL
;
1177 DBG("[thread] Manage application registration started");
1179 ret
= lttcomm_listen_unix_sock(apps_sock
);
1185 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1186 * more will be added to this poll set.
1188 ret
= create_thread_poll_set(&events
, 2);
1193 /* Add the application registration socket */
1194 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1199 /* Notify all applications to register */
1200 ret
= notify_ust_apps(1);
1202 ERR("Failed to notify applications or create the wait shared memory.\n"
1203 "Execution continues but there might be problem for already\n"
1204 "running applications that wishes to register.");
1208 DBG("Accepting application registration");
1210 nb_fd
= LTTNG_POLL_GETNB(&events
);
1212 /* Inifinite blocking call, waiting for transmission */
1213 ret
= lttng_poll_wait(&events
, -1);
1218 for (i
= 0; i
< nb_fd
; i
++) {
1219 /* Fetch once the poll data */
1220 revents
= LTTNG_POLL_GETEV(&events
, i
);
1221 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1223 /* Thread quit pipe has been closed. Killing thread. */
1224 ret
= check_thread_quit_pipe(pollfd
, revents
);
1229 /* Event on the registration socket */
1230 if (pollfd
== apps_sock
) {
1231 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1232 ERR("Register apps socket poll error");
1234 } else if (revents
& LPOLLIN
) {
1235 sock
= lttcomm_accept_unix_sock(apps_sock
);
1240 /* Create UST registration command for enqueuing */
1241 ust_cmd
= malloc(sizeof(struct ust_command
));
1242 if (ust_cmd
== NULL
) {
1243 perror("ust command malloc");
1248 * Using message-based transmissions to ensure we don't
1249 * have to deal with partially received messages.
1251 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1252 sizeof(struct ust_register_msg
));
1253 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1255 perror("lttcomm_recv_unix_sock register apps");
1257 ERR("Wrong size received on apps register");
1264 ust_cmd
->sock
= sock
;
1266 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1267 " gid:%d sock:%d name:%s (version %d.%d)",
1268 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1269 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1270 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1271 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1274 * Lock free enqueue the registration request. The red pill
1275 * has been taken! This apps will be part of the *system*.
1277 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1280 * Wake the registration queue futex. Implicit memory
1281 * barrier with the exchange in cds_wfq_enqueue.
1283 futex_nto1_wake(&ust_cmd_queue
.futex
);
1290 DBG("UST Registration thread dying");
1292 /* Notify that the registration thread is gone */
1297 unlink(apps_unix_sock_path
);
1299 lttng_poll_clean(&events
);
1305 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1306 * exec or it will fails.
1308 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1311 struct timespec timeout
;
1313 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1314 timeout
.tv_nsec
= 0;
1316 /* Setup semaphore */
1317 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1319 PERROR("sem_init consumer semaphore");
1323 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1324 thread_manage_consumer
, consumer_data
);
1326 PERROR("pthread_create consumer");
1331 /* Get time for sem_timedwait absolute timeout */
1332 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1334 PERROR("clock_gettime spawn consumer");
1335 /* Infinite wait for the kconsumerd thread to be ready */
1336 ret
= sem_wait(&consumer_data
->sem
);
1338 /* Normal timeout if the gettime was successful */
1339 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1340 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1344 if (errno
== ETIMEDOUT
) {
1346 * Call has timed out so we kill the kconsumerd_thread and return
1349 ERR("The consumer thread was never ready. Killing it");
1350 ret
= pthread_cancel(consumer_data
->thread
);
1352 PERROR("pthread_cancel consumer thread");
1355 PERROR("semaphore wait failed consumer thread");
1360 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1361 if (consumer_data
->pid
== 0) {
1362 ERR("Kconsumerd did not start");
1363 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1366 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1375 * Join consumer thread
1377 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1382 if (consumer_data
->pid
!= 0) {
1383 ret
= kill(consumer_data
->pid
, SIGTERM
);
1385 ERR("Error killing consumer daemon");
1388 return pthread_join(consumer_data
->thread
, &status
);
1395 * Fork and exec a consumer daemon (consumerd).
1397 * Return pid if successful else -1.
1399 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1403 const char *verbosity
;
1405 DBG("Spawning consumerd");
1412 if (opt_verbose
> 1 || opt_verbose_consumer
) {
1413 verbosity
= "--verbose";
1415 verbosity
= "--quiet";
1417 switch (consumer_data
->type
) {
1418 case LTTNG_CONSUMER_KERNEL
:
1419 execl(INSTALL_BIN_PATH
"/lttng-consumerd",
1420 "lttng-consumerd", verbosity
, "-k", NULL
);
1422 case LTTNG_CONSUMER_UST
:
1423 execl(INSTALL_BIN_PATH
"/lttng-consumerd",
1424 "lttng-consumerd", verbosity
, "-u", NULL
);
1427 perror("unknown consumer type");
1431 perror("kernel start consumer exec");
1434 } else if (pid
> 0) {
1437 perror("start consumer fork");
1444 * Spawn the consumerd daemon and session daemon thread.
1446 static int start_consumerd(struct consumer_data
*consumer_data
)
1450 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1451 if (consumer_data
->pid
!= 0) {
1452 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1456 ret
= spawn_consumerd(consumer_data
);
1458 ERR("Spawning consumerd failed");
1459 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1463 /* Setting up the consumer_data pid */
1464 consumer_data
->pid
= ret
;
1465 DBG2("Consumer pid %d", consumer_data
->pid
);
1466 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1468 DBG2("Spawning consumer control thread");
1469 ret
= spawn_consumer_thread(consumer_data
);
1471 ERR("Fatal error spawning consumer control thread");
1483 * modprobe_kernel_modules
1485 static int modprobe_kernel_modules(void)
1490 for (i
= 0; i
< ARRAY_SIZE(kernel_modules_list
); i
++) {
1491 ret
= snprintf(modprobe
, sizeof(modprobe
),
1492 "/sbin/modprobe %s%s",
1493 kernel_modules_list
[i
].required
? "" : "-q ",
1494 kernel_modules_list
[i
].name
);
1496 perror("snprintf modprobe");
1499 modprobe
[sizeof(modprobe
) - 1] = '\0';
1500 ret
= system(modprobe
);
1502 ERR("Unable to launch modprobe for module %s",
1503 kernel_modules_list
[i
].name
);
1504 } else if (kernel_modules_list
[i
].required
1505 && WEXITSTATUS(ret
) != 0) {
1506 ERR("Unable to load module %s",
1507 kernel_modules_list
[i
].name
);
1509 DBG("Modprobe successfully %s",
1510 kernel_modules_list
[i
].name
);
1521 static int mount_debugfs(char *path
)
1524 char *type
= "debugfs";
1526 ret
= mkdir_recursive(path
, S_IRWXU
| S_IRWXG
, geteuid(), getegid());
1528 PERROR("Cannot create debugfs path");
1532 ret
= mount(type
, path
, type
, 0, NULL
);
1534 PERROR("Cannot mount debugfs");
1538 DBG("Mounted debugfs successfully at %s", path
);
1545 * Setup necessary data for kernel tracer action.
1547 static void init_kernel_tracer(void)
1550 char *proc_mounts
= "/proc/mounts";
1552 char *debugfs_path
= NULL
, *lttng_path
= NULL
;
1555 /* Detect debugfs */
1556 fp
= fopen(proc_mounts
, "r");
1558 ERR("Unable to probe %s", proc_mounts
);
1562 while (fgets(line
, sizeof(line
), fp
) != NULL
) {
1563 if (strstr(line
, "debugfs") != NULL
) {
1564 /* Remove first string */
1566 /* Dup string here so we can reuse line later on */
1567 debugfs_path
= strdup(strtok(NULL
, " "));
1568 DBG("Got debugfs path : %s", debugfs_path
);
1575 /* Mount debugfs if needded */
1576 if (debugfs_path
== NULL
) {
1577 ret
= asprintf(&debugfs_path
, "/mnt/debugfs");
1579 perror("asprintf debugfs path");
1582 ret
= mount_debugfs(debugfs_path
);
1584 perror("Cannot mount debugfs");
1589 /* Modprobe lttng kernel modules */
1590 ret
= modprobe_kernel_modules();
1595 /* Setup lttng kernel path */
1596 ret
= asprintf(<tng_path
, "%s/lttng", debugfs_path
);
1598 perror("asprintf lttng path");
1602 /* Open debugfs lttng */
1603 kernel_tracer_fd
= open(lttng_path
, O_RDWR
);
1604 if (kernel_tracer_fd
< 0) {
1605 DBG("Failed to open %s", lttng_path
);
1611 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1621 WARN("No kernel tracer available");
1622 kernel_tracer_fd
= 0;
1627 * Init tracing by creating trace directory and sending fds kernel consumer.
1629 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
1633 if (session
->consumer_fds_sent
== 0) {
1635 * Assign default kernel consumer socket if no consumer assigned to the
1636 * kernel session. At this point, it's NOT suppose to be 0 but this is
1637 * an extra security check.
1639 if (session
->consumer_fd
== 0) {
1640 session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1643 ret
= send_kconsumer_session_streams(&kconsumer_data
, session
);
1645 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1649 session
->consumer_fds_sent
= 1;
1657 * Create an UST session and add it to the session ust list.
1659 static int create_ust_session(struct ltt_session
*session
,
1660 struct lttng_domain
*domain
)
1664 struct ltt_ust_session
*lus
= NULL
;
1666 switch (domain
->type
) {
1667 case LTTNG_DOMAIN_UST
:
1670 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1674 DBG("Creating UST session");
1676 session_lock_list();
1677 uid
= session_list_ptr
->count
;
1678 session_unlock_list();
1680 lus
= trace_ust_create_session(session
->path
, uid
, domain
);
1682 ret
= LTTCOMM_UST_SESS_FAIL
;
1686 ret
= mkdir_recursive(lus
->pathname
, S_IRWXU
| S_IRWXG
,
1687 geteuid(), allowed_group());
1689 if (ret
!= -EEXIST
) {
1690 ERR("Trace directory creation error");
1691 ret
= LTTCOMM_UST_SESS_FAIL
;
1696 /* The domain type dictate different actions on session creation */
1697 switch (domain
->type
) {
1698 case LTTNG_DOMAIN_UST
:
1699 /* No ustctl for the global UST domain */
1704 session
->ust_session
= lus
;
1714 * Create a kernel tracer session then create the default channel.
1716 static int create_kernel_session(struct ltt_session
*session
)
1720 DBG("Creating kernel session");
1722 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1724 ret
= LTTCOMM_KERN_SESS_FAIL
;
1728 /* Set kernel consumer socket fd */
1729 if (kconsumer_data
.cmd_sock
) {
1730 session
->kernel_session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1733 ret
= mkdir_recursive(session
->kernel_session
->trace_path
,
1734 S_IRWXU
| S_IRWXG
, geteuid(), allowed_group());
1736 if (ret
!= -EEXIST
) {
1737 ERR("Trace directory creation error");
1747 * Using the session list, filled a lttng_session array to send back to the
1748 * client for session listing.
1750 * The session list lock MUST be acquired before calling this function. Use
1751 * session_lock_list() and session_unlock_list().
1753 static void list_lttng_sessions(struct lttng_session
*sessions
)
1756 struct ltt_session
*session
;
1758 DBG("Getting all available session");
1760 * Iterate over session list and append data after the control struct in
1763 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1764 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
1765 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
1766 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
1767 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
1773 * Fill lttng_channel array of all channels.
1775 static void list_lttng_channels(struct ltt_session
*session
,
1776 struct lttng_channel
*channels
)
1779 struct ltt_kernel_channel
*kchan
;
1781 DBG("Listing channels for session %s", session
->name
);
1783 /* Kernel channels */
1784 if (session
->kernel_session
!= NULL
) {
1785 cds_list_for_each_entry(kchan
,
1786 &session
->kernel_session
->channel_list
.head
, list
) {
1787 /* Copy lttng_channel struct to array */
1788 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
1789 channels
[i
].enabled
= kchan
->enabled
;
1794 /* TODO: Missing UST listing */
1798 * Fill lttng_event array of all events in the channel.
1800 static void list_lttng_events(struct ltt_kernel_channel
*kchan
,
1801 struct lttng_event
*events
)
1804 * TODO: This is ONLY kernel. Need UST support.
1807 struct ltt_kernel_event
*event
;
1809 DBG("Listing events for channel %s", kchan
->channel
->name
);
1811 /* Kernel channels */
1812 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
1813 strncpy(events
[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
1814 events
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1815 events
[i
].enabled
= event
->enabled
;
1816 switch (event
->event
->instrumentation
) {
1817 case LTTNG_KERNEL_TRACEPOINT
:
1818 events
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1820 case LTTNG_KERNEL_KPROBE
:
1821 case LTTNG_KERNEL_KRETPROBE
:
1822 events
[i
].type
= LTTNG_EVENT_PROBE
;
1823 memcpy(&events
[i
].attr
.probe
, &event
->event
->u
.kprobe
,
1824 sizeof(struct lttng_kernel_kprobe
));
1826 case LTTNG_KERNEL_FUNCTION
:
1827 events
[i
].type
= LTTNG_EVENT_FUNCTION
;
1828 memcpy(&events
[i
].attr
.ftrace
, &event
->event
->u
.ftrace
,
1829 sizeof(struct lttng_kernel_function
));
1831 case LTTNG_KERNEL_NOOP
:
1832 events
[i
].type
= LTTNG_EVENT_NOOP
;
1834 case LTTNG_KERNEL_SYSCALL
:
1835 events
[i
].type
= LTTNG_EVENT_SYSCALL
;
1837 case LTTNG_KERNEL_ALL
:
1846 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1848 static int cmd_disable_channel(struct ltt_session
*session
,
1849 int domain
, char *channel_name
)
1854 case LTTNG_DOMAIN_KERNEL
:
1855 ret
= channel_kernel_disable(session
->kernel_session
,
1857 if (ret
!= LTTCOMM_OK
) {
1861 kernel_wait_quiescent(kernel_tracer_fd
);
1863 case LTTNG_DOMAIN_UST_PID
:
1866 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1877 * Copy channel from attributes and set it in the application channel list.
1880 static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
1881 struct lttng_channel *attr, struct ust_app *app)
1884 struct ltt_ust_channel *uchan, *new_chan;
1886 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
1887 if (uchan == NULL) {
1888 ret = LTTCOMM_FATAL;
1892 new_chan = trace_ust_create_channel(attr, usess->path);
1893 if (new_chan == NULL) {
1894 PERROR("malloc ltt_ust_channel");
1895 ret = LTTCOMM_FATAL;
1899 ret = channel_ust_copy(new_chan, uchan);
1901 ret = LTTCOMM_FATAL;
1911 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1913 static int cmd_enable_channel(struct ltt_session
*session
,
1914 struct lttng_domain
*domain
, struct lttng_channel
*attr
)
1917 struct ltt_ust_session
*usess
= session
->ust_session
;
1919 DBG("Enabling channel %s for session %s", session
->name
, attr
->name
);
1921 switch (domain
->type
) {
1922 case LTTNG_DOMAIN_KERNEL
:
1924 struct ltt_kernel_channel
*kchan
;
1926 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
1927 session
->kernel_session
);
1928 if (kchan
== NULL
) {
1929 ret
= channel_kernel_create(session
->kernel_session
,
1930 attr
, kernel_poll_pipe
[1]);
1932 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
1935 if (ret
!= LTTCOMM_OK
) {
1939 kernel_wait_quiescent(kernel_tracer_fd
);
1942 case LTTNG_DOMAIN_UST
:
1944 struct ltt_ust_channel
*uchan
;
1946 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
1948 /* Get channel in global UST domain HT */
1949 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1951 if (uchan
== NULL
) {
1952 uchan
= trace_ust_create_channel(attr
, usess
->pathname
);
1953 if (uchan
== NULL
) {
1954 ret
= LTTCOMM_UST_CHAN_FAIL
;
1958 hashtable_add_unique(usess
->domain_global
.channels
, &uchan
->node
);
1960 DBG2("UST channel %s added to global domain HT", attr
->name
);
1962 ret
= LTTCOMM_UST_CHAN_EXIST
;
1966 ret
= ust_app_add_channel(usess
, uchan
);
1967 if (ret
!= LTTCOMM_OK
) {
1973 case LTTNG_DOMAIN_UST_PID
:
1977 struct ltt_ust_channel *uchan;
1978 struct ltt_ust_session *usess;
1979 struct ust_app *app;
1981 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
1983 if (usess == NULL) {
1984 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
1988 app = ust_app_get_by_pid(domain->attr.pid);
1990 ret = LTTCOMM_APP_NOT_FOUND;
1995 uchan = trace_ust_get_channel_by_name(attr->name, usess);
1996 if (uchan == NULL) {
1997 ret = channel_ust_create(usess, attr, sock);
1999 ret = channel_ust_enable(usess, uchan, sock);
2002 if (ret != LTTCOMM_OK) {
2006 ret = copy_ust_channel_to_app(usess, attr, app);
2007 if (ret != LTTCOMM_OK) {
2011 DBG("UST channel %s created for app sock %d with pid %d",
2012 attr->name, app->sock, domain->attr.pid);
2014 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2018 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2029 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2031 static int cmd_disable_event(struct ltt_session
*session
, int domain
,
2032 char *channel_name
, char *event_name
)
2037 case LTTNG_DOMAIN_KERNEL
:
2039 struct ltt_kernel_channel
*kchan
;
2041 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2042 session
->kernel_session
);
2043 if (kchan
== NULL
) {
2044 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2048 ret
= event_kernel_disable_tracepoint(session
->kernel_session
, kchan
, event_name
);
2049 if (ret
!= LTTCOMM_OK
) {
2053 kernel_wait_quiescent(kernel_tracer_fd
);
2056 case LTTNG_DOMAIN_UST
:
2057 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2058 case LTTNG_DOMAIN_UST_PID
:
2059 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2061 /* TODO: Other UST domains */
2062 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2073 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2075 static int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
2079 struct ltt_kernel_channel
*kchan
;
2082 case LTTNG_DOMAIN_KERNEL
:
2083 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2084 session
->kernel_session
);
2085 if (kchan
== NULL
) {
2086 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2090 ret
= event_kernel_disable_all(session
->kernel_session
, kchan
);
2091 if (ret
!= LTTCOMM_OK
) {
2095 kernel_wait_quiescent(kernel_tracer_fd
);
2098 /* TODO: Userspace tracing */
2099 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2110 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2112 static int cmd_add_context(struct ltt_session
*session
, int domain
,
2113 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
2118 case LTTNG_DOMAIN_KERNEL
:
2119 /* Add kernel context to kernel tracer */
2120 ret
= context_kernel_add(session
->kernel_session
, ctx
,
2121 event_name
, channel_name
);
2122 if (ret
!= LTTCOMM_OK
) {
2126 case LTTNG_DOMAIN_UST
:
2129 struct ltt_ust_session *usess;
2131 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2132 ret = context_ust_add(usess, ctx,
2133 event_name, channel_name, domain);
2134 if (ret != LTTCOMM_OK) {
2142 /* TODO: UST other domains */
2143 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2154 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2156 static int cmd_enable_event(struct ltt_session
*session
, int domain
,
2157 char *channel_name
, struct lttng_event
*event
)
2160 struct lttng_channel
*attr
;
2161 struct ltt_ust_session
*usess
= session
->ust_session
;
2164 case LTTNG_DOMAIN_KERNEL
:
2166 struct ltt_kernel_channel
*kchan
;
2168 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2169 session
->kernel_session
);
2170 if (kchan
== NULL
) {
2171 attr
= channel_new_default_attr(domain
);
2173 ret
= LTTCOMM_FATAL
;
2176 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2178 /* This call will notify the kernel thread */
2179 ret
= channel_kernel_create(session
->kernel_session
,
2180 attr
, kernel_poll_pipe
[1]);
2181 if (ret
!= LTTCOMM_OK
) {
2186 /* Get the newly created kernel channel pointer */
2187 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2188 session
->kernel_session
);
2189 if (kchan
== NULL
) {
2190 /* This sould not happen... */
2191 ret
= LTTCOMM_FATAL
;
2195 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
2197 if (ret
!= LTTCOMM_OK
) {
2201 kernel_wait_quiescent(kernel_tracer_fd
);
2204 case LTTNG_DOMAIN_UST
:
2206 struct ltt_ust_channel
*uchan
;
2207 struct ltt_ust_event
*uevent
;
2209 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2211 if (uchan
== NULL
) {
2212 /* TODO: Create default channel */
2213 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2217 uevent
= trace_ust_find_event_by_name(uchan
->events
, event
->name
);
2218 if (uevent
== NULL
) {
2219 uevent
= trace_ust_create_event(event
);
2220 if (uevent
== NULL
) {
2221 ret
= LTTCOMM_FATAL
;
2226 ret
= ust_app_add_event(usess
, uchan
, uevent
);
2228 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2233 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2234 case LTTNG_DOMAIN_UST_PID
:
2235 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2237 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2248 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2250 static int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
2251 char *channel_name
, int event_type
)
2254 struct ltt_kernel_channel
*kchan
;
2257 case LTTNG_DOMAIN_KERNEL
:
2258 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2259 session
->kernel_session
);
2260 if (kchan
== NULL
) {
2261 /* This call will notify the kernel thread */
2262 ret
= channel_kernel_create(session
->kernel_session
, NULL
,
2263 kernel_poll_pipe
[1]);
2264 if (ret
!= LTTCOMM_OK
) {
2269 /* Get the newly created kernel channel pointer */
2270 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2271 session
->kernel_session
);
2272 if (kchan
== NULL
) {
2273 /* This sould not happen... */
2274 ret
= LTTCOMM_FATAL
;
2278 switch (event_type
) {
2279 case LTTNG_KERNEL_SYSCALL
:
2280 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
2281 kchan
, kernel_tracer_fd
);
2283 case LTTNG_KERNEL_TRACEPOINT
:
2285 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2286 * events already registered to the channel.
2288 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
2289 kchan
, kernel_tracer_fd
);
2291 case LTTNG_KERNEL_ALL
:
2292 /* Enable syscalls and tracepoints */
2293 ret
= event_kernel_enable_all(session
->kernel_session
,
2294 kchan
, kernel_tracer_fd
);
2297 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2300 if (ret
!= LTTCOMM_OK
) {
2304 kernel_wait_quiescent(kernel_tracer_fd
);
2307 /* TODO: Userspace tracing */
2308 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2319 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2321 static ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
2324 ssize_t nb_events
= 0;
2327 case LTTNG_DOMAIN_KERNEL
:
2328 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2329 if (nb_events
< 0) {
2330 ret
= LTTCOMM_KERN_LIST_FAIL
;
2335 /* TODO: Userspace listing */
2336 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2343 /* Return negative value to differentiate return code */
2348 * Command LTTNG_START_TRACE processed by the client thread.
2350 static int cmd_start_trace(struct ltt_session
*session
)
2353 struct ltt_kernel_session
*ksession
;
2354 struct ltt_ust_session
*usess
= session
->ust_session
;
2357 ksession
= session
->kernel_session
;
2359 /* Kernel tracing */
2360 if (ksession
!= NULL
) {
2361 struct ltt_kernel_channel
*kchan
;
2363 /* Open kernel metadata */
2364 if (ksession
->metadata
== NULL
) {
2365 ret
= kernel_open_metadata(ksession
, ksession
->trace_path
);
2367 ret
= LTTCOMM_KERN_META_FAIL
;
2372 /* Open kernel metadata stream */
2373 if (ksession
->metadata_stream_fd
== 0) {
2374 ret
= kernel_open_metadata_stream(ksession
);
2376 ERR("Kernel create metadata stream failed");
2377 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2382 /* For each channel */
2383 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2384 if (kchan
->stream_count
== 0) {
2385 ret
= kernel_open_channel_stream(kchan
);
2387 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2390 /* Update the stream global counter */
2391 ksession
->stream_count_global
+= ret
;
2395 /* Setup kernel consumer socket and send fds to it */
2396 ret
= init_kernel_tracing(ksession
);
2398 ret
= LTTCOMM_KERN_START_FAIL
;
2402 /* This start the kernel tracing */
2403 ret
= kernel_start_session(ksession
);
2405 ret
= LTTCOMM_KERN_START_FAIL
;
2409 /* Quiescent wait after starting trace */
2410 kernel_wait_quiescent(kernel_tracer_fd
);
2413 ret
= ust_app_start_trace(usess
);
2415 ret
= LTTCOMM_UST_START_FAIL
;
2426 * Command LTTNG_STOP_TRACE processed by the client thread.
2428 static int cmd_stop_trace(struct ltt_session
*session
)
2431 struct ltt_kernel_channel
*kchan
;
2432 struct ltt_kernel_session
*ksession
;
2433 //struct ltt_ust_session *usess;
2434 //struct ltt_ust_channel *ustchan;
2437 ksession
= session
->kernel_session
;
2440 if (ksession
!= NULL
) {
2441 DBG("Stop kernel tracing");
2443 /* Flush all buffers before stopping */
2444 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2446 ERR("Kernel metadata flush failed");
2449 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2450 ret
= kernel_flush_buffer(kchan
);
2452 ERR("Kernel flush buffer error");
2456 ret
= kernel_stop_session(ksession
);
2458 ret
= LTTCOMM_KERN_STOP_FAIL
;
2462 kernel_wait_quiescent(kernel_tracer_fd
);
2466 /* Stop each UST session */
2467 DBG("Stop UST tracing");
2468 cds_list_for_each_entry(usess
, &session
->ust_session_list
.head
, list
) {
2469 /* Flush all buffers before stopping */
2470 ret
= ustctl_flush_buffer(usess
->sock
, usess
->metadata
->obj
);
2472 ERR("UST metadata flush failed");
2475 cds_list_for_each_entry(ustchan
, &usess
->channels
.head
, list
) {
2476 ret
= ustctl_flush_buffer(usess
->sock
, ustchan
->obj
);
2478 ERR("UST flush buffer error");
2482 ret
= ustctl_stop_session(usess
->sock
, usess
->handle
);
2484 ret
= LTTCOMM_KERN_STOP_FAIL
;
2488 ustctl_wait_quiescent(usess
->sock
);
2499 * Command LTTNG_CREATE_SESSION processed by the client thread.
2501 static int cmd_create_session(char *name
, char *path
)
2505 ret
= session_create(name
, path
);
2506 if (ret
!= LTTCOMM_OK
) {
2517 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2519 static int cmd_destroy_session(struct ltt_session
*session
, char *name
)
2523 /* Clean kernel session teardown */
2524 teardown_kernel_session(session
);
2527 * Must notify the kernel thread here to update it's poll setin order
2528 * to remove the channel(s)' fd just destroyed.
2530 ret
= notify_thread_pipe(kernel_poll_pipe
[1]);
2532 perror("write kernel poll pipe");
2535 ret
= session_destroy(session
);
2541 * Command LTTNG_CALIBRATE processed by the client thread.
2543 static int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
2548 case LTTNG_DOMAIN_KERNEL
:
2550 struct lttng_kernel_calibrate kcalibrate
;
2552 kcalibrate
.type
= calibrate
->type
;
2553 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2555 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2561 /* TODO: Userspace tracing */
2562 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2573 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2575 static int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2581 case LTTNG_DOMAIN_KERNEL
:
2582 /* Can't register a consumer if there is already one */
2583 if (session
->kernel_session
->consumer_fd
!= 0) {
2584 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2588 sock
= lttcomm_connect_unix_sock(sock_path
);
2590 ret
= LTTCOMM_CONNECT_FAIL
;
2594 session
->kernel_session
->consumer_fd
= sock
;
2597 /* TODO: Userspace tracing */
2598 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2609 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2611 static ssize_t
cmd_list_domains(struct ltt_session
*session
,
2612 struct lttng_domain
**domains
)
2617 if (session
->kernel_session
!= NULL
) {
2621 /* TODO: User-space tracer domain support */
2623 *domains
= malloc(nb_dom
* sizeof(struct lttng_domain
));
2624 if (*domains
== NULL
) {
2625 ret
= -LTTCOMM_FATAL
;
2629 (*domains
)[0].type
= LTTNG_DOMAIN_KERNEL
;
2638 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2640 static ssize_t
cmd_list_channels(struct ltt_session
*session
,
2641 struct lttng_channel
**channels
)
2644 ssize_t nb_chan
= 0;
2646 if (session
->kernel_session
!= NULL
) {
2647 nb_chan
+= session
->kernel_session
->channel_count
;
2650 *channels
= malloc(nb_chan
* sizeof(struct lttng_channel
));
2651 if (*channels
== NULL
) {
2652 ret
= -LTTCOMM_FATAL
;
2656 list_lttng_channels(session
, *channels
);
2658 /* TODO UST support */
2667 * Command LTTNG_LIST_EVENTS processed by the client thread.
2669 static ssize_t
cmd_list_events(struct ltt_session
*session
,
2670 char *channel_name
, struct lttng_event
**events
)
2673 ssize_t nb_event
= 0;
2674 struct ltt_kernel_channel
*kchan
= NULL
;
2676 if (session
->kernel_session
!= NULL
) {
2677 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2678 session
->kernel_session
);
2679 if (kchan
== NULL
) {
2680 ret
= -LTTCOMM_KERN_CHAN_NOT_FOUND
;
2683 nb_event
+= kchan
->event_count
;
2686 *events
= malloc(nb_event
* sizeof(struct lttng_event
));
2687 if (*events
== NULL
) {
2688 ret
= -LTTCOMM_FATAL
;
2692 list_lttng_events(kchan
, *events
);
2694 /* TODO: User-space tracer support */
2703 * Process the command requested by the lttng client within the command
2704 * context structure. This function make sure that the return structure (llm)
2705 * is set and ready for transmission before returning.
2707 * Return any error encountered or 0 for success.
2709 static int process_client_msg(struct command_ctx
*cmd_ctx
)
2711 int ret
= LTTCOMM_OK
;
2712 int need_tracing_session
= 1;
2714 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2717 * Check for command that don't needs to allocate a returned payload. We do
2718 * this here so we don't have to make the call for no payload at each
2721 switch(cmd_ctx
->lsm
->cmd_type
) {
2722 case LTTNG_LIST_SESSIONS
:
2723 case LTTNG_LIST_TRACEPOINTS
:
2724 case LTTNG_LIST_DOMAINS
:
2725 case LTTNG_LIST_CHANNELS
:
2726 case LTTNG_LIST_EVENTS
:
2729 /* Setup lttng message with no payload */
2730 ret
= setup_lttng_msg(cmd_ctx
, 0);
2732 /* This label does not try to unlock the session */
2733 goto init_setup_error
;
2737 /* Commands that DO NOT need a session. */
2738 switch (cmd_ctx
->lsm
->cmd_type
) {
2739 case LTTNG_CALIBRATE
:
2740 case LTTNG_CREATE_SESSION
:
2741 case LTTNG_LIST_SESSIONS
:
2742 case LTTNG_LIST_TRACEPOINTS
:
2743 need_tracing_session
= 0;
2746 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
2747 session_lock_list();
2748 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
2749 session_unlock_list();
2750 if (cmd_ctx
->session
== NULL
) {
2751 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
2752 ret
= LTTCOMM_SESS_NOT_FOUND
;
2754 /* If no session name specified */
2755 ret
= LTTCOMM_SELECT_SESS
;
2759 /* Acquire lock for the session */
2760 session_lock(cmd_ctx
->session
);
2766 * Check domain type for specific "pre-action".
2768 switch (cmd_ctx
->lsm
->domain
.type
) {
2769 case LTTNG_DOMAIN_KERNEL
:
2770 /* Kernel tracer check */
2771 if (kernel_tracer_fd
== 0) {
2772 /* Basically, load kernel tracer modules */
2773 init_kernel_tracer();
2774 if (kernel_tracer_fd
== 0) {
2775 ret
= LTTCOMM_KERN_NA
;
2780 /* Need a session for kernel command */
2781 if (need_tracing_session
) {
2782 if (cmd_ctx
->session
->kernel_session
== NULL
) {
2783 ret
= create_kernel_session(cmd_ctx
->session
);
2785 ret
= LTTCOMM_KERN_SESS_FAIL
;
2790 /* Start the kernel consumer daemon */
2791 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2792 if (kconsumer_data
.pid
== 0 &&
2793 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2794 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2795 ret
= start_consumerd(&kconsumer_data
);
2797 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2801 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2804 case LTTNG_DOMAIN_UST
:
2806 if (need_tracing_session
) {
2807 if (cmd_ctx
->session
->ust_session
== NULL
) {
2808 ret
= create_ust_session(cmd_ctx
->session
,
2809 &cmd_ctx
->lsm
->domain
);
2810 if (ret
!= LTTCOMM_OK
) {
2814 /* Start the kernel consumer daemon */
2815 pthread_mutex_lock(&ustconsumer_data
.pid_mutex
);
2816 if (ustconsumer_data
.pid
== 0 &&
2817 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2818 pthread_mutex_unlock(&ustconsumer_data
.pid_mutex
);
2819 ret
= start_consumerd(&ustconsumer_data
);
2821 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2825 cmd_ctx
->session
->ust_session
->consumer_fd
=
2826 ustconsumer_data
.cmd_sock
;
2828 pthread_mutex_unlock(&ustconsumer_data
.pid_mutex
);
2836 /* Process by command type */
2837 switch (cmd_ctx
->lsm
->cmd_type
) {
2838 case LTTNG_ADD_CONTEXT
:
2840 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2841 cmd_ctx
->lsm
->u
.context
.channel_name
,
2842 cmd_ctx
->lsm
->u
.context
.event_name
,
2843 &cmd_ctx
->lsm
->u
.context
.ctx
);
2846 case LTTNG_DISABLE_CHANNEL
:
2848 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2849 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2852 case LTTNG_DISABLE_EVENT
:
2854 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2855 cmd_ctx
->lsm
->u
.disable
.channel_name
,
2856 cmd_ctx
->lsm
->u
.disable
.name
);
2860 case LTTNG_DISABLE_ALL_EVENT
:
2862 DBG("Disabling all events");
2864 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2865 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2868 case LTTNG_ENABLE_CHANNEL
:
2870 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2871 &cmd_ctx
->lsm
->u
.channel
.chan
);
2874 case LTTNG_ENABLE_EVENT
:
2876 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2877 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2878 &cmd_ctx
->lsm
->u
.enable
.event
);
2881 case LTTNG_ENABLE_ALL_EVENT
:
2883 DBG("Enabling all events");
2885 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2886 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2887 cmd_ctx
->lsm
->u
.enable
.event
.type
);
2890 case LTTNG_LIST_TRACEPOINTS
:
2892 struct lttng_event
*events
;
2895 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
2896 if (nb_events
< 0) {
2902 * Setup lttng message with payload size set to the event list size in
2903 * bytes and then copy list into the llm payload.
2905 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
2911 /* Copy event list into message payload */
2912 memcpy(cmd_ctx
->llm
->payload
, events
,
2913 sizeof(struct lttng_event
) * nb_events
);
2920 case LTTNG_START_TRACE
:
2922 ret
= cmd_start_trace(cmd_ctx
->session
);
2925 case LTTNG_STOP_TRACE
:
2927 ret
= cmd_stop_trace(cmd_ctx
->session
);
2930 case LTTNG_CREATE_SESSION
:
2932 ret
= cmd_create_session(cmd_ctx
->lsm
->session
.name
,
2933 cmd_ctx
->lsm
->session
.path
);
2936 case LTTNG_DESTROY_SESSION
:
2938 ret
= cmd_destroy_session(cmd_ctx
->session
,
2939 cmd_ctx
->lsm
->session
.name
);
2942 case LTTNG_LIST_DOMAINS
:
2945 struct lttng_domain
*domains
;
2947 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
2953 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
2958 /* Copy event list into message payload */
2959 memcpy(cmd_ctx
->llm
->payload
, domains
,
2960 nb_dom
* sizeof(struct lttng_domain
));
2967 case LTTNG_LIST_CHANNELS
:
2970 struct lttng_channel
*channels
;
2972 nb_chan
= cmd_list_channels(cmd_ctx
->session
, &channels
);
2978 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
2983 /* Copy event list into message payload */
2984 memcpy(cmd_ctx
->llm
->payload
, channels
,
2985 nb_chan
* sizeof(struct lttng_channel
));
2992 case LTTNG_LIST_EVENTS
:
2995 struct lttng_event
*events
= NULL
;
2997 nb_event
= cmd_list_events(cmd_ctx
->session
,
2998 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3004 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3009 /* Copy event list into message payload */
3010 memcpy(cmd_ctx
->llm
->payload
, events
,
3011 nb_event
* sizeof(struct lttng_event
));
3018 case LTTNG_LIST_SESSIONS
:
3020 session_lock_list();
3022 if (session_list_ptr
->count
== 0) {
3023 ret
= LTTCOMM_NO_SESSION
;
3024 session_unlock_list();
3028 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) *
3029 session_list_ptr
->count
);
3031 session_unlock_list();
3035 /* Filled the session array */
3036 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
));
3038 session_unlock_list();
3043 case LTTNG_CALIBRATE
:
3045 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3046 &cmd_ctx
->lsm
->u
.calibrate
);
3049 case LTTNG_REGISTER_CONSUMER
:
3051 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3052 cmd_ctx
->lsm
->u
.reg
.path
);
3061 if (cmd_ctx
->llm
== NULL
) {
3062 DBG("Missing llm structure. Allocating one.");
3063 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3067 /* Set return code */
3068 cmd_ctx
->llm
->ret_code
= ret
;
3070 if (cmd_ctx
->session
) {
3071 session_unlock(cmd_ctx
->session
);
3078 * This thread manage all clients request using the unix client socket for
3081 static void *thread_manage_clients(void *data
)
3083 int sock
= 0, ret
, i
, pollfd
;
3084 uint32_t revents
, nb_fd
;
3085 struct command_ctx
*cmd_ctx
= NULL
;
3086 struct lttng_poll_event events
;
3088 DBG("[thread] Manage client started");
3090 rcu_register_thread();
3092 ret
= lttcomm_listen_unix_sock(client_sock
);
3098 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3099 * more will be added to this poll set.
3101 ret
= create_thread_poll_set(&events
, 2);
3106 /* Add the application registration socket */
3107 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3113 * Notify parent pid that we are ready to accept command for client side.
3115 if (opt_sig_parent
) {
3116 kill(ppid
, SIGCHLD
);
3120 DBG("Accepting client command ...");
3122 nb_fd
= LTTNG_POLL_GETNB(&events
);
3124 /* Inifinite blocking call, waiting for transmission */
3125 ret
= lttng_poll_wait(&events
, -1);
3130 for (i
= 0; i
< nb_fd
; i
++) {
3131 /* Fetch once the poll data */
3132 revents
= LTTNG_POLL_GETEV(&events
, i
);
3133 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3135 /* Thread quit pipe has been closed. Killing thread. */
3136 ret
= check_thread_quit_pipe(pollfd
, revents
);
3141 /* Event on the registration socket */
3142 if (pollfd
== client_sock
) {
3143 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3144 ERR("Client socket poll error");
3150 DBG("Wait for client response");
3152 sock
= lttcomm_accept_unix_sock(client_sock
);
3157 /* Allocate context command to process the client request */
3158 cmd_ctx
= malloc(sizeof(struct command_ctx
));
3159 if (cmd_ctx
== NULL
) {
3160 perror("malloc cmd_ctx");
3164 /* Allocate data buffer for reception */
3165 cmd_ctx
->lsm
= malloc(sizeof(struct lttcomm_session_msg
));
3166 if (cmd_ctx
->lsm
== NULL
) {
3167 perror("malloc cmd_ctx->lsm");
3171 cmd_ctx
->llm
= NULL
;
3172 cmd_ctx
->session
= NULL
;
3175 * Data is received from the lttng client. The struct
3176 * lttcomm_session_msg (lsm) contains the command and data request of
3179 DBG("Receiving data from client ...");
3180 ret
= lttcomm_recv_unix_sock(sock
, cmd_ctx
->lsm
,
3181 sizeof(struct lttcomm_session_msg
));
3183 DBG("Nothing recv() from client... continuing");
3189 // TODO: Validate cmd_ctx including sanity check for
3190 // security purpose.
3192 rcu_thread_online();
3194 * This function dispatch the work to the kernel or userspace tracer
3195 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3196 * informations for the client. The command context struct contains
3197 * everything this function may needs.
3199 ret
= process_client_msg(cmd_ctx
);
3200 rcu_thread_offline();
3203 * TODO: Inform client somehow of the fatal error. At
3204 * this point, ret < 0 means that a malloc failed
3205 * (ENOMEM). Error detected but still accept command.
3207 clean_command_ctx(&cmd_ctx
);
3211 DBG("Sending response (size: %d, retcode: %s)",
3212 cmd_ctx
->lttng_msg_size
,
3213 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3214 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3216 ERR("Failed to send data back to client");
3219 clean_command_ctx(&cmd_ctx
);
3221 /* End of transmission */
3226 DBG("Client thread dying");
3227 unlink(client_unix_sock_path
);
3231 lttng_poll_clean(&events
);
3232 clean_command_ctx(&cmd_ctx
);
3234 rcu_unregister_thread();
3240 * usage function on stderr
3242 static void usage(void)
3244 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3245 fprintf(stderr
, " -h, --help Display this usage.\n");
3246 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3247 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3248 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3249 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3250 fprintf(stderr
, " --ustconsumerd-err-sock PATH Specify path for the UST consumer error socket\n");
3251 fprintf(stderr
, " --ustconsumerd-cmd-sock PATH Specify path for the UST consumer command socket\n");
3252 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3253 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3254 fprintf(stderr
, " -V, --version Show version number.\n");
3255 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3256 fprintf(stderr
, " -q, --quiet No output at all.\n");
3257 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3258 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3262 * daemon argument parsing
3264 static int parse_args(int argc
, char **argv
)
3268 static struct option long_options
[] = {
3269 { "client-sock", 1, 0, 'c' },
3270 { "apps-sock", 1, 0, 'a' },
3271 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3272 { "kconsumerd-err-sock", 1, 0, 'E' },
3273 { "ustconsumerd-cmd-sock", 1, 0, 'D' },
3274 { "ustconsumerd-err-sock", 1, 0, 'F' },
3275 { "daemonize", 0, 0, 'd' },
3276 { "sig-parent", 0, 0, 'S' },
3277 { "help", 0, 0, 'h' },
3278 { "group", 1, 0, 'g' },
3279 { "version", 0, 0, 'V' },
3280 { "quiet", 0, 0, 'q' },
3281 { "verbose", 0, 0, 'v' },
3282 { "verbose-consumer", 0, 0, 'Z' },
3287 int option_index
= 0;
3288 c
= getopt_long(argc
, argv
, "dhqvVS" "a:c:g:s:C:E:D:F:Z",
3289 long_options
, &option_index
);
3296 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3298 fprintf(stderr
, " with arg %s\n", optarg
);
3302 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3305 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3311 opt_tracing_group
= strdup(optarg
);
3317 fprintf(stdout
, "%s\n", VERSION
);
3323 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3326 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3329 snprintf(ustconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3332 snprintf(ustconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3338 /* Verbose level can increase using multiple -v */
3342 opt_verbose_consumer
+= 1;
3345 /* Unknown option or other error.
3346 * Error is printed by getopt, just return */
3355 * Creates the two needed socket by the daemon.
3356 * apps_sock - The communication socket for all UST apps.
3357 * client_sock - The communication of the cli tool (lttng).
3359 static int init_daemon_socket(void)
3364 old_umask
= umask(0);
3366 /* Create client tool unix socket */
3367 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
3368 if (client_sock
< 0) {
3369 ERR("Create unix sock failed: %s", client_unix_sock_path
);
3374 /* File permission MUST be 660 */
3375 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3377 ERR("Set file permissions failed: %s", client_unix_sock_path
);
3382 /* Create the application unix socket */
3383 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
3384 if (apps_sock
< 0) {
3385 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
3390 /* File permission MUST be 666 */
3391 ret
= chmod(apps_unix_sock_path
,
3392 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
3394 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
3405 * Check if the global socket is available, and if a daemon is answering at the
3406 * other side. If yes, error is returned.
3408 static int check_existing_daemon(void)
3410 if (access(client_unix_sock_path
, F_OK
) < 0 &&
3411 access(apps_unix_sock_path
, F_OK
) < 0) {
3415 /* Is there anybody out there ? */
3416 if (lttng_session_daemon_alive()) {
3424 * Set the tracing group gid onto the client socket.
3426 * Race window between mkdir and chown is OK because we are going from more
3427 * permissive (root.root) to les permissive (root.tracing).
3429 static int set_permissions(void)
3434 gid
= allowed_group();
3437 WARN("No tracing group detected");
3440 ERR("Missing tracing group. Aborting execution.");
3446 /* Set lttng run dir */
3447 ret
= chown(LTTNG_RUNDIR
, 0, gid
);
3449 ERR("Unable to set group on " LTTNG_RUNDIR
);
3453 /* lttng client socket path */
3454 ret
= chown(client_unix_sock_path
, 0, gid
);
3456 ERR("Unable to set group on %s", client_unix_sock_path
);
3460 /* kconsumer error socket path */
3461 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
3463 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
3467 /* ustconsumer error socket path */
3468 ret
= chown(ustconsumer_data
.err_unix_sock_path
, 0, gid
);
3470 ERR("Unable to set group on %s", ustconsumer_data
.err_unix_sock_path
);
3474 DBG("All permissions are set");
3481 * Create the pipe used to wake up the kernel thread.
3483 static int create_kernel_poll_pipe(void)
3485 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
3489 * Create the application command pipe to wake thread_manage_apps.
3491 static int create_apps_cmd_pipe(void)
3493 return pipe2(apps_cmd_pipe
, O_CLOEXEC
);
3497 * Create the lttng run directory needed for all global sockets and pipe.
3499 static int create_lttng_rundir(void)
3503 ret
= mkdir(LTTNG_RUNDIR
, S_IRWXU
| S_IRWXG
);
3505 if (errno
!= EEXIST
) {
3506 ERR("Unable to create " LTTNG_RUNDIR
);
3518 * Setup sockets and directory needed by the kconsumerd communication with the
3521 static int set_consumer_sockets(struct consumer_data
*consumer_data
)
3524 const char *path
= consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3525 KCONSUMERD_PATH
: USTCONSUMERD_PATH
;
3527 if (strlen(consumer_data
->err_unix_sock_path
) == 0) {
3528 snprintf(consumer_data
->err_unix_sock_path
, PATH_MAX
,
3529 consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3530 KCONSUMERD_ERR_SOCK_PATH
:
3531 USTCONSUMERD_ERR_SOCK_PATH
);
3534 if (strlen(consumer_data
->cmd_unix_sock_path
) == 0) {
3535 snprintf(consumer_data
->cmd_unix_sock_path
, PATH_MAX
,
3536 consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3537 KCONSUMERD_CMD_SOCK_PATH
:
3538 USTCONSUMERD_CMD_SOCK_PATH
);
3541 ret
= mkdir(path
, S_IRWXU
| S_IRWXG
);
3543 if (errno
!= EEXIST
) {
3544 ERR("Failed to create %s", path
);
3550 /* Create the kconsumerd error unix socket */
3551 consumer_data
->err_sock
=
3552 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
3553 if (consumer_data
->err_sock
< 0) {
3554 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
3559 /* File permission MUST be 660 */
3560 ret
= chmod(consumer_data
->err_unix_sock_path
,
3561 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3563 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
3573 * Signal handler for the daemon
3575 * Simply stop all worker threads, leaving main() return gracefully after
3576 * joining all threads and calling cleanup().
3578 static void sighandler(int sig
)
3582 DBG("SIGPIPE catched");
3585 DBG("SIGINT catched");
3589 DBG("SIGTERM catched");
3598 * Setup signal handler for :
3599 * SIGINT, SIGTERM, SIGPIPE
3601 static int set_signal_handler(void)
3604 struct sigaction sa
;
3607 if ((ret
= sigemptyset(&sigset
)) < 0) {
3608 perror("sigemptyset");
3612 sa
.sa_handler
= sighandler
;
3613 sa
.sa_mask
= sigset
;
3615 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
3616 perror("sigaction");
3620 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
3621 perror("sigaction");
3625 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
3626 perror("sigaction");
3630 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
3636 * Set open files limit to unlimited. This daemon can open a large number of
3637 * file descriptors in order to consumer multiple kernel traces.
3639 static void set_ulimit(void)
3644 /* The kernel does not allowed an infinite limit for open files */
3645 lim
.rlim_cur
= 65535;
3646 lim
.rlim_max
= 65535;
3648 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
3650 perror("failed to set open files limit");
3657 int main(int argc
, char **argv
)
3661 const char *home_path
;
3663 rcu_register_thread();
3665 /* Create thread quit pipe */
3666 if ((ret
= init_thread_quit_pipe()) < 0) {
3670 /* Parse arguments */
3672 if ((ret
= parse_args(argc
, argv
) < 0)) {
3685 /* Check if daemon is UID = 0 */
3686 is_root
= !getuid();
3689 ret
= create_lttng_rundir();
3694 if (strlen(apps_unix_sock_path
) == 0) {
3695 snprintf(apps_unix_sock_path
, PATH_MAX
,
3696 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
3699 if (strlen(client_unix_sock_path
) == 0) {
3700 snprintf(client_unix_sock_path
, PATH_MAX
,
3701 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
3704 /* Set global SHM for ust */
3705 if (strlen(wait_shm_path
) == 0) {
3706 snprintf(wait_shm_path
, PATH_MAX
,
3707 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
3710 home_path
= get_home_dir();
3711 if (home_path
== NULL
) {
3712 /* TODO: Add --socket PATH option */
3713 ERR("Can't get HOME directory for sockets creation.");
3718 if (strlen(apps_unix_sock_path
) == 0) {
3719 snprintf(apps_unix_sock_path
, PATH_MAX
,
3720 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
3723 /* Set the cli tool unix socket path */
3724 if (strlen(client_unix_sock_path
) == 0) {
3725 snprintf(client_unix_sock_path
, PATH_MAX
,
3726 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
3729 /* Set global SHM for ust */
3730 if (strlen(wait_shm_path
) == 0) {
3731 snprintf(wait_shm_path
, PATH_MAX
,
3732 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
3736 DBG("Client socket path %s", client_unix_sock_path
);
3737 DBG("Application socket path %s", apps_unix_sock_path
);
3740 * See if daemon already exist.
3742 if ((ret
= check_existing_daemon()) < 0) {
3743 ERR("Already running daemon.\n");
3745 * We do not goto exit because we must not cleanup()
3746 * because a daemon is already running.
3751 /* After this point, we can safely call cleanup() with "goto exit" */
3754 * These actions must be executed as root. We do that *after* setting up
3755 * the sockets path because we MUST make the check for another daemon using
3756 * those paths *before* trying to set the kernel consumer sockets and init
3760 ret
= set_consumer_sockets(&kconsumer_data
);
3765 ret
= set_consumer_sockets(&ustconsumer_data
);
3769 /* Setup kernel tracer */
3770 init_kernel_tracer();
3772 /* Set ulimit for open files */
3776 if ((ret
= set_signal_handler()) < 0) {
3780 /* Setup the needed unix socket */
3781 if ((ret
= init_daemon_socket()) < 0) {
3785 /* Set credentials to socket */
3786 if (is_root
&& ((ret
= set_permissions()) < 0)) {
3790 /* Get parent pid if -S, --sig-parent is specified. */
3791 if (opt_sig_parent
) {
3795 /* Setup the kernel pipe for waking up the kernel thread */
3796 if ((ret
= create_kernel_poll_pipe()) < 0) {
3800 /* Setup the thread apps communication pipe. */
3801 if ((ret
= create_apps_cmd_pipe()) < 0) {
3805 /* Init UST command queue. */
3806 cds_wfq_init(&ust_cmd_queue
.queue
);
3808 /* Init UST app hash table */
3812 * Get session list pointer. This pointer MUST NOT be free(). This list is
3813 * statically declared in session.c
3815 session_list_ptr
= session_get_list();
3817 /* Set up max poll set size */
3818 lttng_poll_set_max_size();
3820 /* Create thread to manage the client socket */
3821 ret
= pthread_create(&client_thread
, NULL
,
3822 thread_manage_clients
, (void *) NULL
);
3824 perror("pthread_create clients");
3828 /* Create thread to dispatch registration */
3829 ret
= pthread_create(&dispatch_thread
, NULL
,
3830 thread_dispatch_ust_registration
, (void *) NULL
);
3832 perror("pthread_create dispatch");
3836 /* Create thread to manage application registration. */
3837 ret
= pthread_create(®_apps_thread
, NULL
,
3838 thread_registration_apps
, (void *) NULL
);
3840 perror("pthread_create registration");
3844 /* Create thread to manage application socket */
3845 ret
= pthread_create(&apps_thread
, NULL
,
3846 thread_manage_apps
, (void *) NULL
);
3848 perror("pthread_create apps");
3852 /* Create kernel thread to manage kernel event */
3853 ret
= pthread_create(&kernel_thread
, NULL
,
3854 thread_manage_kernel
, (void *) NULL
);
3856 perror("pthread_create kernel");
3860 ret
= pthread_join(kernel_thread
, &status
);
3862 perror("pthread_join");
3863 goto error
; /* join error, exit without cleanup */
3867 ret
= pthread_join(apps_thread
, &status
);
3869 perror("pthread_join");
3870 goto error
; /* join error, exit without cleanup */
3874 ret
= pthread_join(reg_apps_thread
, &status
);
3876 perror("pthread_join");
3877 goto error
; /* join error, exit without cleanup */
3881 ret
= pthread_join(dispatch_thread
, &status
);
3883 perror("pthread_join");
3884 goto error
; /* join error, exit without cleanup */
3888 ret
= pthread_join(client_thread
, &status
);
3890 perror("pthread_join");
3891 goto error
; /* join error, exit without cleanup */
3894 ret
= join_consumer_thread(&kconsumer_data
);
3896 perror("join_consumer");
3897 goto error
; /* join error, exit without cleanup */
3903 * cleanup() is called when no other thread is running.
3905 rcu_thread_online();
3907 rcu_thread_offline();
3908 rcu_unregister_thread();