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 * For each tracing session, update newly registered apps.
717 static void update_ust_app(int app_sock
)
719 struct ltt_session
*sess
, *stmp
;
721 /* For all tracing session(s) */
722 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
723 ust_app_global_update(sess
->ust_session
, app_sock
);
728 * This thread manage event coming from the kernel.
730 * Features supported in this thread:
733 static void *thread_manage_kernel(void *data
)
735 int ret
, i
, pollfd
, update_poll_flag
= 1;
736 uint32_t revents
, nb_fd
;
738 struct lttng_poll_event events
;
740 DBG("Thread manage kernel started");
742 ret
= create_thread_poll_set(&events
, 2);
747 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
753 if (update_poll_flag
== 1) {
755 * Reset number of fd in the poll set. Always 2 since there is the thread
756 * quit pipe and the kernel pipe.
760 ret
= update_kernel_poll(&events
);
764 update_poll_flag
= 0;
767 nb_fd
= LTTNG_POLL_GETNB(&events
);
769 DBG("Thread kernel polling on %d fds", nb_fd
);
771 /* Zeroed the poll events */
772 lttng_poll_reset(&events
);
774 /* Poll infinite value of time */
775 ret
= lttng_poll_wait(&events
, -1);
778 } else if (ret
== 0) {
779 /* Should not happen since timeout is infinite */
780 ERR("Return value of poll is 0 with an infinite timeout.\n"
781 "This should not have happened! Continuing...");
785 for (i
= 0; i
< nb_fd
; i
++) {
786 /* Fetch once the poll data */
787 revents
= LTTNG_POLL_GETEV(&events
, i
);
788 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
790 /* Thread quit pipe has been closed. Killing thread. */
791 ret
= check_thread_quit_pipe(pollfd
, revents
);
796 /* Check for data on kernel pipe */
797 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
798 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
799 update_poll_flag
= 1;
803 * New CPU detected by the kernel. Adding kernel stream to
804 * kernel session and updating the kernel consumer
806 if (revents
& LPOLLIN
) {
807 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
813 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
814 * and unregister kernel stream at this point.
822 DBG("Kernel thread dying");
823 close(kernel_poll_pipe
[0]);
824 close(kernel_poll_pipe
[1]);
826 lttng_poll_clean(&events
);
832 * This thread manage the consumer error sent back to the session daemon.
834 static void *thread_manage_consumer(void *data
)
836 int sock
= 0, i
, ret
, pollfd
;
837 uint32_t revents
, nb_fd
;
838 enum lttcomm_return_code code
;
839 struct lttng_poll_event events
;
840 struct consumer_data
*consumer_data
= data
;
842 DBG("[thread] Manage consumer started");
844 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
850 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
851 * Nothing more will be added to this poll set.
853 ret
= create_thread_poll_set(&events
, 2);
858 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
863 nb_fd
= LTTNG_POLL_GETNB(&events
);
865 /* Inifinite blocking call, waiting for transmission */
866 ret
= lttng_poll_wait(&events
, -1);
871 for (i
= 0; i
< nb_fd
; i
++) {
872 /* Fetch once the poll data */
873 revents
= LTTNG_POLL_GETEV(&events
, i
);
874 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
876 /* Thread quit pipe has been closed. Killing thread. */
877 ret
= check_thread_quit_pipe(pollfd
, revents
);
882 /* Event on the registration socket */
883 if (pollfd
== consumer_data
->err_sock
) {
884 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
885 ERR("consumer err socket poll error");
891 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
896 DBG2("Receiving code from consumer err_sock");
898 /* Getting status code from kconsumerd */
899 ret
= lttcomm_recv_unix_sock(sock
, &code
,
900 sizeof(enum lttcomm_return_code
));
905 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
906 consumer_data
->cmd_sock
=
907 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
908 if (consumer_data
->cmd_sock
< 0) {
909 sem_post(&consumer_data
->sem
);
910 PERROR("consumer connect");
913 /* Signal condition to tell that the kconsumerd is ready */
914 sem_post(&consumer_data
->sem
);
915 DBG("consumer command socket ready");
917 ERR("consumer error when waiting for SOCK_READY : %s",
918 lttcomm_get_readable_code(-code
));
922 /* Remove the kconsumerd error sock since we've established a connexion */
923 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
928 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
933 /* Update number of fd */
934 nb_fd
= LTTNG_POLL_GETNB(&events
);
936 /* Inifinite blocking call, waiting for transmission */
937 ret
= lttng_poll_wait(&events
, -1);
942 for (i
= 0; i
< nb_fd
; i
++) {
943 /* Fetch once the poll data */
944 revents
= LTTNG_POLL_GETEV(&events
, i
);
945 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
947 /* Thread quit pipe has been closed. Killing thread. */
948 ret
= check_thread_quit_pipe(pollfd
, revents
);
953 /* Event on the kconsumerd socket */
954 if (pollfd
== sock
) {
955 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
956 ERR("consumer err socket second poll error");
962 /* Wait for any kconsumerd error */
963 ret
= lttcomm_recv_unix_sock(sock
, &code
,
964 sizeof(enum lttcomm_return_code
));
966 ERR("consumer closed the command socket");
970 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
973 DBG("consumer thread dying");
974 close(consumer_data
->err_sock
);
975 close(consumer_data
->cmd_sock
);
978 unlink(consumer_data
->err_unix_sock_path
);
979 unlink(consumer_data
->cmd_unix_sock_path
);
980 consumer_data
->pid
= 0;
982 lttng_poll_clean(&events
);
988 * This thread manage application communication.
990 static void *thread_manage_apps(void *data
)
993 uint32_t revents
, nb_fd
;
994 struct ust_command ust_cmd
;
995 struct lttng_poll_event events
;
997 DBG("[thread] Manage application started");
999 rcu_register_thread();
1000 rcu_thread_online();
1002 ret
= create_thread_poll_set(&events
, 2);
1007 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1013 /* Zeroed the events structure */
1014 lttng_poll_reset(&events
);
1016 nb_fd
= LTTNG_POLL_GETNB(&events
);
1018 DBG("Apps thread polling on %d fds", nb_fd
);
1020 /* Inifinite blocking call, waiting for transmission */
1021 ret
= lttng_poll_wait(&events
, -1);
1026 for (i
= 0; i
< nb_fd
; i
++) {
1027 /* Fetch once the poll data */
1028 revents
= LTTNG_POLL_GETEV(&events
, i
);
1029 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1031 /* Thread quit pipe has been closed. Killing thread. */
1032 ret
= check_thread_quit_pipe(pollfd
, revents
);
1037 /* Inspect the apps cmd pipe */
1038 if (pollfd
== apps_cmd_pipe
[0]) {
1039 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1040 ERR("Apps command pipe error");
1042 } else if (revents
& LPOLLIN
) {
1044 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1045 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1046 perror("read apps cmd pipe");
1050 /* Register applicaton to the session daemon */
1051 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1054 /* Only critical ENOMEM error can be returned here */
1058 ret
= ustctl_register_done(ust_cmd
.sock
);
1061 * If the registration is not possible, we simply
1062 * unregister the apps and continue
1064 ust_app_unregister(ust_cmd
.sock
);
1067 * We just need here to monitor the close of the UST
1068 * socket and poll set monitor those by default.
1070 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, 0);
1075 DBG("Apps with sock %d added to poll set",
1080 * Add channel(s) and event(s) to newly registered apps
1081 * from lttng global UST domain.
1083 update_ust_app(ust_cmd
.sock
);
1088 * At this point, we know that a registered application made
1089 * the event at poll_wait.
1091 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1092 /* Removing from the poll set */
1093 ret
= lttng_poll_del(&events
, pollfd
);
1099 ust_app_unregister(pollfd
);
1107 DBG("Application communication apps dying");
1108 close(apps_cmd_pipe
[0]);
1109 close(apps_cmd_pipe
[1]);
1111 lttng_poll_clean(&events
);
1113 rcu_thread_offline();
1114 rcu_unregister_thread();
1119 * Dispatch request from the registration threads to the application
1120 * communication thread.
1122 static void *thread_dispatch_ust_registration(void *data
)
1125 struct cds_wfq_node
*node
;
1126 struct ust_command
*ust_cmd
= NULL
;
1128 DBG("[thread] Dispatch UST command started");
1130 while (!dispatch_thread_exit
) {
1131 /* Atomically prepare the queue futex */
1132 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1135 /* Dequeue command for registration */
1136 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1138 DBG("Woken up but nothing in the UST command queue");
1139 /* Continue thread execution */
1143 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1145 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1146 " gid:%d sock:%d name:%s (version %d.%d)",
1147 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1148 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1149 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1150 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1152 * Inform apps thread of the new application registration. This
1153 * call is blocking so we can be assured that the data will be read
1154 * at some point in time or wait to the end of the world :)
1156 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1157 sizeof(struct ust_command
));
1159 perror("write apps cmd pipe");
1160 if (errno
== EBADF
) {
1162 * We can't inform the application thread to process
1163 * registration. We will exit or else application
1164 * registration will not occur and tracing will never
1171 } while (node
!= NULL
);
1173 /* Futex wait on queue. Blocking call on futex() */
1174 futex_nto1_wait(&ust_cmd_queue
.futex
);
1178 DBG("Dispatch thread dying");
1183 * This thread manage application registration.
1185 static void *thread_registration_apps(void *data
)
1187 int sock
= 0, i
, ret
, pollfd
;
1188 uint32_t revents
, nb_fd
;
1189 struct lttng_poll_event events
;
1191 * Get allocated in this thread, enqueued to a global queue, dequeued and
1192 * freed in the manage apps thread.
1194 struct ust_command
*ust_cmd
= NULL
;
1196 DBG("[thread] Manage application registration started");
1198 ret
= lttcomm_listen_unix_sock(apps_sock
);
1204 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1205 * more will be added to this poll set.
1207 ret
= create_thread_poll_set(&events
, 2);
1212 /* Add the application registration socket */
1213 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1218 /* Notify all applications to register */
1219 ret
= notify_ust_apps(1);
1221 ERR("Failed to notify applications or create the wait shared memory.\n"
1222 "Execution continues but there might be problem for already\n"
1223 "running applications that wishes to register.");
1227 DBG("Accepting application registration");
1229 nb_fd
= LTTNG_POLL_GETNB(&events
);
1231 /* Inifinite blocking call, waiting for transmission */
1232 ret
= lttng_poll_wait(&events
, -1);
1237 for (i
= 0; i
< nb_fd
; i
++) {
1238 /* Fetch once the poll data */
1239 revents
= LTTNG_POLL_GETEV(&events
, i
);
1240 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1242 /* Thread quit pipe has been closed. Killing thread. */
1243 ret
= check_thread_quit_pipe(pollfd
, revents
);
1248 /* Event on the registration socket */
1249 if (pollfd
== apps_sock
) {
1250 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1251 ERR("Register apps socket poll error");
1253 } else if (revents
& LPOLLIN
) {
1254 sock
= lttcomm_accept_unix_sock(apps_sock
);
1259 /* Create UST registration command for enqueuing */
1260 ust_cmd
= malloc(sizeof(struct ust_command
));
1261 if (ust_cmd
== NULL
) {
1262 perror("ust command malloc");
1267 * Using message-based transmissions to ensure we don't
1268 * have to deal with partially received messages.
1270 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1271 sizeof(struct ust_register_msg
));
1272 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1274 perror("lttcomm_recv_unix_sock register apps");
1276 ERR("Wrong size received on apps register");
1283 ust_cmd
->sock
= sock
;
1285 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1286 " gid:%d sock:%d name:%s (version %d.%d)",
1287 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1288 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1289 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1290 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1293 * Lock free enqueue the registration request. The red pill
1294 * has been taken! This apps will be part of the *system*.
1296 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1299 * Wake the registration queue futex. Implicit memory
1300 * barrier with the exchange in cds_wfq_enqueue.
1302 futex_nto1_wake(&ust_cmd_queue
.futex
);
1309 DBG("UST Registration thread dying");
1311 /* Notify that the registration thread is gone */
1316 unlink(apps_unix_sock_path
);
1318 lttng_poll_clean(&events
);
1324 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1325 * exec or it will fails.
1327 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1330 struct timespec timeout
;
1332 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1333 timeout
.tv_nsec
= 0;
1335 /* Setup semaphore */
1336 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1338 PERROR("sem_init consumer semaphore");
1342 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1343 thread_manage_consumer
, consumer_data
);
1345 PERROR("pthread_create consumer");
1350 /* Get time for sem_timedwait absolute timeout */
1351 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1353 PERROR("clock_gettime spawn consumer");
1354 /* Infinite wait for the kconsumerd thread to be ready */
1355 ret
= sem_wait(&consumer_data
->sem
);
1357 /* Normal timeout if the gettime was successful */
1358 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1359 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1363 if (errno
== ETIMEDOUT
) {
1365 * Call has timed out so we kill the kconsumerd_thread and return
1368 ERR("The consumer thread was never ready. Killing it");
1369 ret
= pthread_cancel(consumer_data
->thread
);
1371 PERROR("pthread_cancel consumer thread");
1374 PERROR("semaphore wait failed consumer thread");
1379 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1380 if (consumer_data
->pid
== 0) {
1381 ERR("Kconsumerd did not start");
1382 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1385 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1394 * Join consumer thread
1396 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1401 if (consumer_data
->pid
!= 0) {
1402 ret
= kill(consumer_data
->pid
, SIGTERM
);
1404 ERR("Error killing consumer daemon");
1407 return pthread_join(consumer_data
->thread
, &status
);
1414 * Fork and exec a consumer daemon (consumerd).
1416 * Return pid if successful else -1.
1418 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1422 const char *verbosity
;
1424 DBG("Spawning consumerd");
1431 if (opt_verbose
> 1 || opt_verbose_consumer
) {
1432 verbosity
= "--verbose";
1434 verbosity
= "--quiet";
1436 switch (consumer_data
->type
) {
1437 case LTTNG_CONSUMER_KERNEL
:
1438 execl(INSTALL_BIN_PATH
"/lttng-consumerd",
1439 "lttng-consumerd", verbosity
, "-k", NULL
);
1441 case LTTNG_CONSUMER_UST
:
1442 execl(INSTALL_BIN_PATH
"/lttng-consumerd",
1443 "lttng-consumerd", verbosity
, "-u", NULL
);
1446 perror("unknown consumer type");
1450 perror("kernel start consumer exec");
1453 } else if (pid
> 0) {
1456 perror("start consumer fork");
1463 * Spawn the consumerd daemon and session daemon thread.
1465 static int start_consumerd(struct consumer_data
*consumer_data
)
1469 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1470 if (consumer_data
->pid
!= 0) {
1471 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1475 ret
= spawn_consumerd(consumer_data
);
1477 ERR("Spawning consumerd failed");
1478 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1482 /* Setting up the consumer_data pid */
1483 consumer_data
->pid
= ret
;
1484 DBG2("Consumer pid %d", consumer_data
->pid
);
1485 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1487 DBG2("Spawning consumer control thread");
1488 ret
= spawn_consumer_thread(consumer_data
);
1490 ERR("Fatal error spawning consumer control thread");
1502 * modprobe_kernel_modules
1504 static int modprobe_kernel_modules(void)
1509 for (i
= 0; i
< ARRAY_SIZE(kernel_modules_list
); i
++) {
1510 ret
= snprintf(modprobe
, sizeof(modprobe
),
1511 "/sbin/modprobe %s%s",
1512 kernel_modules_list
[i
].required
? "" : "-q ",
1513 kernel_modules_list
[i
].name
);
1515 perror("snprintf modprobe");
1518 modprobe
[sizeof(modprobe
) - 1] = '\0';
1519 ret
= system(modprobe
);
1521 ERR("Unable to launch modprobe for module %s",
1522 kernel_modules_list
[i
].name
);
1523 } else if (kernel_modules_list
[i
].required
1524 && WEXITSTATUS(ret
) != 0) {
1525 ERR("Unable to load module %s",
1526 kernel_modules_list
[i
].name
);
1528 DBG("Modprobe successfully %s",
1529 kernel_modules_list
[i
].name
);
1540 static int mount_debugfs(char *path
)
1543 char *type
= "debugfs";
1545 ret
= mkdir_recursive(path
, S_IRWXU
| S_IRWXG
, geteuid(), getegid());
1547 PERROR("Cannot create debugfs path");
1551 ret
= mount(type
, path
, type
, 0, NULL
);
1553 PERROR("Cannot mount debugfs");
1557 DBG("Mounted debugfs successfully at %s", path
);
1564 * Setup necessary data for kernel tracer action.
1566 static void init_kernel_tracer(void)
1569 char *proc_mounts
= "/proc/mounts";
1571 char *debugfs_path
= NULL
, *lttng_path
= NULL
;
1574 /* Detect debugfs */
1575 fp
= fopen(proc_mounts
, "r");
1577 ERR("Unable to probe %s", proc_mounts
);
1581 while (fgets(line
, sizeof(line
), fp
) != NULL
) {
1582 if (strstr(line
, "debugfs") != NULL
) {
1583 /* Remove first string */
1585 /* Dup string here so we can reuse line later on */
1586 debugfs_path
= strdup(strtok(NULL
, " "));
1587 DBG("Got debugfs path : %s", debugfs_path
);
1594 /* Mount debugfs if needded */
1595 if (debugfs_path
== NULL
) {
1596 ret
= asprintf(&debugfs_path
, "/mnt/debugfs");
1598 perror("asprintf debugfs path");
1601 ret
= mount_debugfs(debugfs_path
);
1603 perror("Cannot mount debugfs");
1608 /* Modprobe lttng kernel modules */
1609 ret
= modprobe_kernel_modules();
1614 /* Setup lttng kernel path */
1615 ret
= asprintf(<tng_path
, "%s/lttng", debugfs_path
);
1617 perror("asprintf lttng path");
1621 /* Open debugfs lttng */
1622 kernel_tracer_fd
= open(lttng_path
, O_RDWR
);
1623 if (kernel_tracer_fd
< 0) {
1624 DBG("Failed to open %s", lttng_path
);
1630 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1640 WARN("No kernel tracer available");
1641 kernel_tracer_fd
= 0;
1646 * Init tracing by creating trace directory and sending fds kernel consumer.
1648 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
1652 if (session
->consumer_fds_sent
== 0) {
1654 * Assign default kernel consumer socket if no consumer assigned to the
1655 * kernel session. At this point, it's NOT suppose to be 0 but this is
1656 * an extra security check.
1658 if (session
->consumer_fd
== 0) {
1659 session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1662 ret
= send_kconsumer_session_streams(&kconsumer_data
, session
);
1664 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1668 session
->consumer_fds_sent
= 1;
1676 * Create an UST session and add it to the session ust list.
1678 static int create_ust_session(struct ltt_session
*session
,
1679 struct lttng_domain
*domain
)
1683 struct ltt_ust_session
*lus
= NULL
;
1685 switch (domain
->type
) {
1686 case LTTNG_DOMAIN_UST
:
1689 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1693 DBG("Creating UST session");
1695 session_lock_list();
1696 uid
= session_list_ptr
->count
;
1697 session_unlock_list();
1699 lus
= trace_ust_create_session(session
->path
, uid
, domain
);
1701 ret
= LTTCOMM_UST_SESS_FAIL
;
1705 ret
= mkdir_recursive(lus
->pathname
, S_IRWXU
| S_IRWXG
,
1706 geteuid(), allowed_group());
1708 if (ret
!= -EEXIST
) {
1709 ERR("Trace directory creation error");
1710 ret
= LTTCOMM_UST_SESS_FAIL
;
1715 /* The domain type dictate different actions on session creation */
1716 switch (domain
->type
) {
1717 case LTTNG_DOMAIN_UST
:
1718 /* No ustctl for the global UST domain */
1723 session
->ust_session
= lus
;
1733 * Create a kernel tracer session then create the default channel.
1735 static int create_kernel_session(struct ltt_session
*session
)
1739 DBG("Creating kernel session");
1741 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1743 ret
= LTTCOMM_KERN_SESS_FAIL
;
1747 /* Set kernel consumer socket fd */
1748 if (kconsumer_data
.cmd_sock
) {
1749 session
->kernel_session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1752 ret
= mkdir_recursive(session
->kernel_session
->trace_path
,
1753 S_IRWXU
| S_IRWXG
, geteuid(), allowed_group());
1755 if (ret
!= -EEXIST
) {
1756 ERR("Trace directory creation error");
1766 * Using the session list, filled a lttng_session array to send back to the
1767 * client for session listing.
1769 * The session list lock MUST be acquired before calling this function. Use
1770 * session_lock_list() and session_unlock_list().
1772 static void list_lttng_sessions(struct lttng_session
*sessions
)
1775 struct ltt_session
*session
;
1777 DBG("Getting all available session");
1779 * Iterate over session list and append data after the control struct in
1782 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1783 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
1784 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
1785 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
1786 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
1792 * Fill lttng_channel array of all channels.
1794 static void list_lttng_channels(struct ltt_session
*session
,
1795 struct lttng_channel
*channels
)
1798 struct ltt_kernel_channel
*kchan
;
1800 DBG("Listing channels for session %s", session
->name
);
1802 /* Kernel channels */
1803 if (session
->kernel_session
!= NULL
) {
1804 cds_list_for_each_entry(kchan
,
1805 &session
->kernel_session
->channel_list
.head
, list
) {
1806 /* Copy lttng_channel struct to array */
1807 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
1808 channels
[i
].enabled
= kchan
->enabled
;
1813 /* TODO: Missing UST listing */
1817 * Fill lttng_event array of all events in the channel.
1819 static void list_lttng_events(struct ltt_kernel_channel
*kchan
,
1820 struct lttng_event
*events
)
1823 * TODO: This is ONLY kernel. Need UST support.
1826 struct ltt_kernel_event
*event
;
1828 DBG("Listing events for channel %s", kchan
->channel
->name
);
1830 /* Kernel channels */
1831 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
1832 strncpy(events
[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
1833 events
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1834 events
[i
].enabled
= event
->enabled
;
1835 switch (event
->event
->instrumentation
) {
1836 case LTTNG_KERNEL_TRACEPOINT
:
1837 events
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1839 case LTTNG_KERNEL_KPROBE
:
1840 case LTTNG_KERNEL_KRETPROBE
:
1841 events
[i
].type
= LTTNG_EVENT_PROBE
;
1842 memcpy(&events
[i
].attr
.probe
, &event
->event
->u
.kprobe
,
1843 sizeof(struct lttng_kernel_kprobe
));
1845 case LTTNG_KERNEL_FUNCTION
:
1846 events
[i
].type
= LTTNG_EVENT_FUNCTION
;
1847 memcpy(&events
[i
].attr
.ftrace
, &event
->event
->u
.ftrace
,
1848 sizeof(struct lttng_kernel_function
));
1850 case LTTNG_KERNEL_NOOP
:
1851 events
[i
].type
= LTTNG_EVENT_NOOP
;
1853 case LTTNG_KERNEL_SYSCALL
:
1854 events
[i
].type
= LTTNG_EVENT_SYSCALL
;
1856 case LTTNG_KERNEL_ALL
:
1865 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1867 static int cmd_disable_channel(struct ltt_session
*session
,
1868 int domain
, char *channel_name
)
1873 case LTTNG_DOMAIN_KERNEL
:
1874 ret
= channel_kernel_disable(session
->kernel_session
,
1876 if (ret
!= LTTCOMM_OK
) {
1880 kernel_wait_quiescent(kernel_tracer_fd
);
1882 case LTTNG_DOMAIN_UST_PID
:
1885 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1896 * Copy channel from attributes and set it in the application channel list.
1899 static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
1900 struct lttng_channel *attr, struct ust_app *app)
1903 struct ltt_ust_channel *uchan, *new_chan;
1905 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
1906 if (uchan == NULL) {
1907 ret = LTTCOMM_FATAL;
1911 new_chan = trace_ust_create_channel(attr, usess->path);
1912 if (new_chan == NULL) {
1913 PERROR("malloc ltt_ust_channel");
1914 ret = LTTCOMM_FATAL;
1918 ret = channel_ust_copy(new_chan, uchan);
1920 ret = LTTCOMM_FATAL;
1930 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1932 static int cmd_enable_channel(struct ltt_session
*session
,
1933 struct lttng_domain
*domain
, struct lttng_channel
*attr
)
1936 struct ltt_ust_session
*usess
= session
->ust_session
;
1938 DBG("Enabling channel %s for session %s", session
->name
, attr
->name
);
1940 switch (domain
->type
) {
1941 case LTTNG_DOMAIN_KERNEL
:
1943 struct ltt_kernel_channel
*kchan
;
1945 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
1946 session
->kernel_session
);
1947 if (kchan
== NULL
) {
1948 ret
= channel_kernel_create(session
->kernel_session
,
1949 attr
, kernel_poll_pipe
[1]);
1951 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
1954 if (ret
!= LTTCOMM_OK
) {
1958 kernel_wait_quiescent(kernel_tracer_fd
);
1961 case LTTNG_DOMAIN_UST
:
1963 struct ltt_ust_channel
*uchan
;
1965 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
1967 /* Get channel in global UST domain HT */
1968 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1970 if (uchan
== NULL
) {
1971 uchan
= trace_ust_create_channel(attr
, usess
->pathname
);
1972 if (uchan
== NULL
) {
1973 ret
= LTTCOMM_UST_CHAN_FAIL
;
1977 hashtable_add_unique(usess
->domain_global
.channels
, &uchan
->node
);
1979 DBG2("UST channel %s added to global domain HT", attr
->name
);
1981 ret
= LTTCOMM_UST_CHAN_EXIST
;
1985 ret
= ust_app_add_channel(usess
, uchan
);
1986 if (ret
!= LTTCOMM_OK
) {
1992 case LTTNG_DOMAIN_UST_PID
:
1996 struct ltt_ust_channel *uchan;
1997 struct ltt_ust_session *usess;
1998 struct ust_app *app;
2000 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
2002 if (usess == NULL) {
2003 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2007 app = ust_app_get_by_pid(domain->attr.pid);
2009 ret = LTTCOMM_APP_NOT_FOUND;
2014 uchan = trace_ust_get_channel_by_name(attr->name, usess);
2015 if (uchan == NULL) {
2016 ret = channel_ust_create(usess, attr, sock);
2018 ret = channel_ust_enable(usess, uchan, sock);
2021 if (ret != LTTCOMM_OK) {
2025 ret = copy_ust_channel_to_app(usess, attr, app);
2026 if (ret != LTTCOMM_OK) {
2030 DBG("UST channel %s created for app sock %d with pid %d",
2031 attr->name, app->sock, domain->attr.pid);
2033 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2037 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2048 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2050 static int cmd_disable_event(struct ltt_session
*session
, int domain
,
2051 char *channel_name
, char *event_name
)
2056 case LTTNG_DOMAIN_KERNEL
:
2058 struct ltt_kernel_channel
*kchan
;
2060 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2061 session
->kernel_session
);
2062 if (kchan
== NULL
) {
2063 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2067 ret
= event_kernel_disable_tracepoint(session
->kernel_session
, kchan
, event_name
);
2068 if (ret
!= LTTCOMM_OK
) {
2072 kernel_wait_quiescent(kernel_tracer_fd
);
2075 case LTTNG_DOMAIN_UST
:
2076 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2077 case LTTNG_DOMAIN_UST_PID
:
2078 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2080 /* TODO: Other UST domains */
2081 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2092 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2094 static int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
2098 struct ltt_kernel_channel
*kchan
;
2101 case LTTNG_DOMAIN_KERNEL
:
2102 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2103 session
->kernel_session
);
2104 if (kchan
== NULL
) {
2105 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2109 ret
= event_kernel_disable_all(session
->kernel_session
, kchan
);
2110 if (ret
!= LTTCOMM_OK
) {
2114 kernel_wait_quiescent(kernel_tracer_fd
);
2117 /* TODO: Userspace tracing */
2118 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2129 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2131 static int cmd_add_context(struct ltt_session
*session
, int domain
,
2132 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
2137 case LTTNG_DOMAIN_KERNEL
:
2138 /* Add kernel context to kernel tracer */
2139 ret
= context_kernel_add(session
->kernel_session
, ctx
,
2140 event_name
, channel_name
);
2141 if (ret
!= LTTCOMM_OK
) {
2145 case LTTNG_DOMAIN_UST
:
2148 struct ltt_ust_session *usess;
2150 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2151 ret = context_ust_add(usess, ctx,
2152 event_name, channel_name, domain);
2153 if (ret != LTTCOMM_OK) {
2161 /* TODO: UST other domains */
2162 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2173 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2175 static int cmd_enable_event(struct ltt_session
*session
, int domain
,
2176 char *channel_name
, struct lttng_event
*event
)
2179 struct lttng_channel
*attr
;
2180 struct ltt_ust_session
*usess
= session
->ust_session
;
2183 case LTTNG_DOMAIN_KERNEL
:
2185 struct ltt_kernel_channel
*kchan
;
2187 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2188 session
->kernel_session
);
2189 if (kchan
== NULL
) {
2190 attr
= channel_new_default_attr(domain
);
2192 ret
= LTTCOMM_FATAL
;
2195 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2197 /* This call will notify the kernel thread */
2198 ret
= channel_kernel_create(session
->kernel_session
,
2199 attr
, kernel_poll_pipe
[1]);
2200 if (ret
!= LTTCOMM_OK
) {
2205 /* Get the newly created kernel channel pointer */
2206 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2207 session
->kernel_session
);
2208 if (kchan
== NULL
) {
2209 /* This sould not happen... */
2210 ret
= LTTCOMM_FATAL
;
2214 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
2216 if (ret
!= LTTCOMM_OK
) {
2220 kernel_wait_quiescent(kernel_tracer_fd
);
2223 case LTTNG_DOMAIN_UST
:
2225 struct ltt_ust_channel
*uchan
;
2226 struct ltt_ust_event
*uevent
;
2228 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2230 if (uchan
== NULL
) {
2231 /* TODO: Create default channel */
2232 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2236 uevent
= trace_ust_find_event_by_name(uchan
->events
, event
->name
);
2237 if (uevent
== NULL
) {
2238 uevent
= trace_ust_create_event(event
);
2239 if (uevent
== NULL
) {
2240 ret
= LTTCOMM_FATAL
;
2245 ret
= ust_app_add_event(usess
, uchan
, uevent
);
2247 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2252 hashtable_add_unique(uchan
->events
, &uevent
->node
);
2256 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2257 case LTTNG_DOMAIN_UST_PID
:
2258 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2260 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2271 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2273 static int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
2274 char *channel_name
, int event_type
)
2277 struct ltt_kernel_channel
*kchan
;
2280 case LTTNG_DOMAIN_KERNEL
:
2281 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2282 session
->kernel_session
);
2283 if (kchan
== NULL
) {
2284 /* This call will notify the kernel thread */
2285 ret
= channel_kernel_create(session
->kernel_session
, NULL
,
2286 kernel_poll_pipe
[1]);
2287 if (ret
!= LTTCOMM_OK
) {
2292 /* Get the newly created kernel channel pointer */
2293 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2294 session
->kernel_session
);
2295 if (kchan
== NULL
) {
2296 /* This sould not happen... */
2297 ret
= LTTCOMM_FATAL
;
2301 switch (event_type
) {
2302 case LTTNG_KERNEL_SYSCALL
:
2303 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
2304 kchan
, kernel_tracer_fd
);
2306 case LTTNG_KERNEL_TRACEPOINT
:
2308 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2309 * events already registered to the channel.
2311 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
2312 kchan
, kernel_tracer_fd
);
2314 case LTTNG_KERNEL_ALL
:
2315 /* Enable syscalls and tracepoints */
2316 ret
= event_kernel_enable_all(session
->kernel_session
,
2317 kchan
, kernel_tracer_fd
);
2320 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2323 if (ret
!= LTTCOMM_OK
) {
2327 kernel_wait_quiescent(kernel_tracer_fd
);
2330 /* TODO: Userspace tracing */
2331 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2342 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2344 static ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
2347 ssize_t nb_events
= 0;
2350 case LTTNG_DOMAIN_KERNEL
:
2351 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2352 if (nb_events
< 0) {
2353 ret
= LTTCOMM_KERN_LIST_FAIL
;
2358 /* TODO: Userspace listing */
2359 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2366 /* Return negative value to differentiate return code */
2371 * Command LTTNG_START_TRACE processed by the client thread.
2373 static int cmd_start_trace(struct ltt_session
*session
)
2376 struct ltt_kernel_session
*ksession
;
2377 struct ltt_ust_session
*usess
= session
->ust_session
;
2380 ksession
= session
->kernel_session
;
2382 /* Kernel tracing */
2383 if (ksession
!= NULL
) {
2384 struct ltt_kernel_channel
*kchan
;
2386 /* Open kernel metadata */
2387 if (ksession
->metadata
== NULL
) {
2388 ret
= kernel_open_metadata(ksession
, ksession
->trace_path
);
2390 ret
= LTTCOMM_KERN_META_FAIL
;
2395 /* Open kernel metadata stream */
2396 if (ksession
->metadata_stream_fd
== 0) {
2397 ret
= kernel_open_metadata_stream(ksession
);
2399 ERR("Kernel create metadata stream failed");
2400 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2405 /* For each channel */
2406 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2407 if (kchan
->stream_count
== 0) {
2408 ret
= kernel_open_channel_stream(kchan
);
2410 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2413 /* Update the stream global counter */
2414 ksession
->stream_count_global
+= ret
;
2418 /* Setup kernel consumer socket and send fds to it */
2419 ret
= init_kernel_tracing(ksession
);
2421 ret
= LTTCOMM_KERN_START_FAIL
;
2425 /* This start the kernel tracing */
2426 ret
= kernel_start_session(ksession
);
2428 ret
= LTTCOMM_KERN_START_FAIL
;
2432 /* Quiescent wait after starting trace */
2433 kernel_wait_quiescent(kernel_tracer_fd
);
2436 ret
= ust_app_start_trace(usess
);
2438 ret
= LTTCOMM_UST_START_FAIL
;
2449 * Command LTTNG_STOP_TRACE processed by the client thread.
2451 static int cmd_stop_trace(struct ltt_session
*session
)
2454 struct ltt_kernel_channel
*kchan
;
2455 struct ltt_kernel_session
*ksession
;
2456 //struct ltt_ust_session *usess;
2457 //struct ltt_ust_channel *ustchan;
2460 ksession
= session
->kernel_session
;
2463 if (ksession
!= NULL
) {
2464 DBG("Stop kernel tracing");
2466 /* Flush all buffers before stopping */
2467 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2469 ERR("Kernel metadata flush failed");
2472 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2473 ret
= kernel_flush_buffer(kchan
);
2475 ERR("Kernel flush buffer error");
2479 ret
= kernel_stop_session(ksession
);
2481 ret
= LTTCOMM_KERN_STOP_FAIL
;
2485 kernel_wait_quiescent(kernel_tracer_fd
);
2489 /* Stop each UST session */
2490 DBG("Stop UST tracing");
2491 cds_list_for_each_entry(usess
, &session
->ust_session_list
.head
, list
) {
2492 /* Flush all buffers before stopping */
2493 ret
= ustctl_flush_buffer(usess
->sock
, usess
->metadata
->obj
);
2495 ERR("UST metadata flush failed");
2498 cds_list_for_each_entry(ustchan
, &usess
->channels
.head
, list
) {
2499 ret
= ustctl_flush_buffer(usess
->sock
, ustchan
->obj
);
2501 ERR("UST flush buffer error");
2505 ret
= ustctl_stop_session(usess
->sock
, usess
->handle
);
2507 ret
= LTTCOMM_KERN_STOP_FAIL
;
2511 ustctl_wait_quiescent(usess
->sock
);
2522 * Command LTTNG_CREATE_SESSION processed by the client thread.
2524 static int cmd_create_session(char *name
, char *path
)
2528 ret
= session_create(name
, path
);
2529 if (ret
!= LTTCOMM_OK
) {
2540 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2542 static int cmd_destroy_session(struct ltt_session
*session
, char *name
)
2546 /* Clean kernel session teardown */
2547 teardown_kernel_session(session
);
2550 * Must notify the kernel thread here to update it's poll setin order
2551 * to remove the channel(s)' fd just destroyed.
2553 ret
= notify_thread_pipe(kernel_poll_pipe
[1]);
2555 perror("write kernel poll pipe");
2558 ret
= session_destroy(session
);
2564 * Command LTTNG_CALIBRATE processed by the client thread.
2566 static int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
2571 case LTTNG_DOMAIN_KERNEL
:
2573 struct lttng_kernel_calibrate kcalibrate
;
2575 kcalibrate
.type
= calibrate
->type
;
2576 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2578 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2584 /* TODO: Userspace tracing */
2585 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2596 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2598 static int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2604 case LTTNG_DOMAIN_KERNEL
:
2605 /* Can't register a consumer if there is already one */
2606 if (session
->kernel_session
->consumer_fd
!= 0) {
2607 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2611 sock
= lttcomm_connect_unix_sock(sock_path
);
2613 ret
= LTTCOMM_CONNECT_FAIL
;
2617 session
->kernel_session
->consumer_fd
= sock
;
2620 /* TODO: Userspace tracing */
2621 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2632 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2634 static ssize_t
cmd_list_domains(struct ltt_session
*session
,
2635 struct lttng_domain
**domains
)
2640 if (session
->kernel_session
!= NULL
) {
2644 /* TODO: User-space tracer domain support */
2646 *domains
= malloc(nb_dom
* sizeof(struct lttng_domain
));
2647 if (*domains
== NULL
) {
2648 ret
= -LTTCOMM_FATAL
;
2652 (*domains
)[0].type
= LTTNG_DOMAIN_KERNEL
;
2661 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2663 static ssize_t
cmd_list_channels(struct ltt_session
*session
,
2664 struct lttng_channel
**channels
)
2667 ssize_t nb_chan
= 0;
2669 if (session
->kernel_session
!= NULL
) {
2670 nb_chan
+= session
->kernel_session
->channel_count
;
2673 *channels
= malloc(nb_chan
* sizeof(struct lttng_channel
));
2674 if (*channels
== NULL
) {
2675 ret
= -LTTCOMM_FATAL
;
2679 list_lttng_channels(session
, *channels
);
2681 /* TODO UST support */
2690 * Command LTTNG_LIST_EVENTS processed by the client thread.
2692 static ssize_t
cmd_list_events(struct ltt_session
*session
,
2693 char *channel_name
, struct lttng_event
**events
)
2696 ssize_t nb_event
= 0;
2697 struct ltt_kernel_channel
*kchan
= NULL
;
2699 if (session
->kernel_session
!= NULL
) {
2700 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2701 session
->kernel_session
);
2702 if (kchan
== NULL
) {
2703 ret
= -LTTCOMM_KERN_CHAN_NOT_FOUND
;
2706 nb_event
+= kchan
->event_count
;
2709 *events
= malloc(nb_event
* sizeof(struct lttng_event
));
2710 if (*events
== NULL
) {
2711 ret
= -LTTCOMM_FATAL
;
2715 list_lttng_events(kchan
, *events
);
2717 /* TODO: User-space tracer support */
2726 * Process the command requested by the lttng client within the command
2727 * context structure. This function make sure that the return structure (llm)
2728 * is set and ready for transmission before returning.
2730 * Return any error encountered or 0 for success.
2732 static int process_client_msg(struct command_ctx
*cmd_ctx
)
2734 int ret
= LTTCOMM_OK
;
2735 int need_tracing_session
= 1;
2737 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2740 * Check for command that don't needs to allocate a returned payload. We do
2741 * this here so we don't have to make the call for no payload at each
2744 switch(cmd_ctx
->lsm
->cmd_type
) {
2745 case LTTNG_LIST_SESSIONS
:
2746 case LTTNG_LIST_TRACEPOINTS
:
2747 case LTTNG_LIST_DOMAINS
:
2748 case LTTNG_LIST_CHANNELS
:
2749 case LTTNG_LIST_EVENTS
:
2752 /* Setup lttng message with no payload */
2753 ret
= setup_lttng_msg(cmd_ctx
, 0);
2755 /* This label does not try to unlock the session */
2756 goto init_setup_error
;
2760 /* Commands that DO NOT need a session. */
2761 switch (cmd_ctx
->lsm
->cmd_type
) {
2762 case LTTNG_CALIBRATE
:
2763 case LTTNG_CREATE_SESSION
:
2764 case LTTNG_LIST_SESSIONS
:
2765 case LTTNG_LIST_TRACEPOINTS
:
2766 need_tracing_session
= 0;
2769 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
2770 session_lock_list();
2771 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
2772 session_unlock_list();
2773 if (cmd_ctx
->session
== NULL
) {
2774 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
2775 ret
= LTTCOMM_SESS_NOT_FOUND
;
2777 /* If no session name specified */
2778 ret
= LTTCOMM_SELECT_SESS
;
2782 /* Acquire lock for the session */
2783 session_lock(cmd_ctx
->session
);
2789 * Check domain type for specific "pre-action".
2791 switch (cmd_ctx
->lsm
->domain
.type
) {
2792 case LTTNG_DOMAIN_KERNEL
:
2793 /* Kernel tracer check */
2794 if (kernel_tracer_fd
== 0) {
2795 /* Basically, load kernel tracer modules */
2796 init_kernel_tracer();
2797 if (kernel_tracer_fd
== 0) {
2798 ret
= LTTCOMM_KERN_NA
;
2803 /* Need a session for kernel command */
2804 if (need_tracing_session
) {
2805 if (cmd_ctx
->session
->kernel_session
== NULL
) {
2806 ret
= create_kernel_session(cmd_ctx
->session
);
2808 ret
= LTTCOMM_KERN_SESS_FAIL
;
2813 /* Start the kernel consumer daemon */
2814 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2815 if (kconsumer_data
.pid
== 0 &&
2816 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2817 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2818 ret
= start_consumerd(&kconsumer_data
);
2820 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2824 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2827 case LTTNG_DOMAIN_UST
:
2829 if (need_tracing_session
) {
2830 if (cmd_ctx
->session
->ust_session
== NULL
) {
2831 ret
= create_ust_session(cmd_ctx
->session
,
2832 &cmd_ctx
->lsm
->domain
);
2833 if (ret
!= LTTCOMM_OK
) {
2837 /* Start the kernel consumer daemon */
2838 pthread_mutex_lock(&ustconsumer_data
.pid_mutex
);
2839 if (ustconsumer_data
.pid
== 0 &&
2840 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2841 pthread_mutex_unlock(&ustconsumer_data
.pid_mutex
);
2842 ret
= start_consumerd(&ustconsumer_data
);
2844 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2848 cmd_ctx
->session
->ust_session
->consumer_fd
=
2849 ustconsumer_data
.cmd_sock
;
2851 pthread_mutex_unlock(&ustconsumer_data
.pid_mutex
);
2859 /* Process by command type */
2860 switch (cmd_ctx
->lsm
->cmd_type
) {
2861 case LTTNG_ADD_CONTEXT
:
2863 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2864 cmd_ctx
->lsm
->u
.context
.channel_name
,
2865 cmd_ctx
->lsm
->u
.context
.event_name
,
2866 &cmd_ctx
->lsm
->u
.context
.ctx
);
2869 case LTTNG_DISABLE_CHANNEL
:
2871 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2872 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2875 case LTTNG_DISABLE_EVENT
:
2877 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2878 cmd_ctx
->lsm
->u
.disable
.channel_name
,
2879 cmd_ctx
->lsm
->u
.disable
.name
);
2883 case LTTNG_DISABLE_ALL_EVENT
:
2885 DBG("Disabling all events");
2887 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2888 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2891 case LTTNG_ENABLE_CHANNEL
:
2893 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2894 &cmd_ctx
->lsm
->u
.channel
.chan
);
2897 case LTTNG_ENABLE_EVENT
:
2899 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2900 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2901 &cmd_ctx
->lsm
->u
.enable
.event
);
2904 case LTTNG_ENABLE_ALL_EVENT
:
2906 DBG("Enabling all events");
2908 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2909 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2910 cmd_ctx
->lsm
->u
.enable
.event
.type
);
2913 case LTTNG_LIST_TRACEPOINTS
:
2915 struct lttng_event
*events
;
2918 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
2919 if (nb_events
< 0) {
2925 * Setup lttng message with payload size set to the event list size in
2926 * bytes and then copy list into the llm payload.
2928 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
2934 /* Copy event list into message payload */
2935 memcpy(cmd_ctx
->llm
->payload
, events
,
2936 sizeof(struct lttng_event
) * nb_events
);
2943 case LTTNG_START_TRACE
:
2945 ret
= cmd_start_trace(cmd_ctx
->session
);
2948 case LTTNG_STOP_TRACE
:
2950 ret
= cmd_stop_trace(cmd_ctx
->session
);
2953 case LTTNG_CREATE_SESSION
:
2955 ret
= cmd_create_session(cmd_ctx
->lsm
->session
.name
,
2956 cmd_ctx
->lsm
->session
.path
);
2959 case LTTNG_DESTROY_SESSION
:
2961 ret
= cmd_destroy_session(cmd_ctx
->session
,
2962 cmd_ctx
->lsm
->session
.name
);
2965 case LTTNG_LIST_DOMAINS
:
2968 struct lttng_domain
*domains
;
2970 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
2976 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
2981 /* Copy event list into message payload */
2982 memcpy(cmd_ctx
->llm
->payload
, domains
,
2983 nb_dom
* sizeof(struct lttng_domain
));
2990 case LTTNG_LIST_CHANNELS
:
2993 struct lttng_channel
*channels
;
2995 nb_chan
= cmd_list_channels(cmd_ctx
->session
, &channels
);
3001 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3006 /* Copy event list into message payload */
3007 memcpy(cmd_ctx
->llm
->payload
, channels
,
3008 nb_chan
* sizeof(struct lttng_channel
));
3015 case LTTNG_LIST_EVENTS
:
3018 struct lttng_event
*events
= NULL
;
3020 nb_event
= cmd_list_events(cmd_ctx
->session
,
3021 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3027 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3032 /* Copy event list into message payload */
3033 memcpy(cmd_ctx
->llm
->payload
, events
,
3034 nb_event
* sizeof(struct lttng_event
));
3041 case LTTNG_LIST_SESSIONS
:
3043 session_lock_list();
3045 if (session_list_ptr
->count
== 0) {
3046 ret
= LTTCOMM_NO_SESSION
;
3047 session_unlock_list();
3051 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) *
3052 session_list_ptr
->count
);
3054 session_unlock_list();
3058 /* Filled the session array */
3059 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
));
3061 session_unlock_list();
3066 case LTTNG_CALIBRATE
:
3068 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3069 &cmd_ctx
->lsm
->u
.calibrate
);
3072 case LTTNG_REGISTER_CONSUMER
:
3074 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3075 cmd_ctx
->lsm
->u
.reg
.path
);
3084 if (cmd_ctx
->llm
== NULL
) {
3085 DBG("Missing llm structure. Allocating one.");
3086 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3090 /* Set return code */
3091 cmd_ctx
->llm
->ret_code
= ret
;
3093 if (cmd_ctx
->session
) {
3094 session_unlock(cmd_ctx
->session
);
3101 * This thread manage all clients request using the unix client socket for
3104 static void *thread_manage_clients(void *data
)
3106 int sock
= 0, ret
, i
, pollfd
;
3107 uint32_t revents
, nb_fd
;
3108 struct command_ctx
*cmd_ctx
= NULL
;
3109 struct lttng_poll_event events
;
3111 DBG("[thread] Manage client started");
3113 rcu_register_thread();
3115 ret
= lttcomm_listen_unix_sock(client_sock
);
3121 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3122 * more will be added to this poll set.
3124 ret
= create_thread_poll_set(&events
, 2);
3129 /* Add the application registration socket */
3130 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3136 * Notify parent pid that we are ready to accept command for client side.
3138 if (opt_sig_parent
) {
3139 kill(ppid
, SIGCHLD
);
3143 DBG("Accepting client command ...");
3145 nb_fd
= LTTNG_POLL_GETNB(&events
);
3147 /* Inifinite blocking call, waiting for transmission */
3148 ret
= lttng_poll_wait(&events
, -1);
3153 for (i
= 0; i
< nb_fd
; i
++) {
3154 /* Fetch once the poll data */
3155 revents
= LTTNG_POLL_GETEV(&events
, i
);
3156 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3158 /* Thread quit pipe has been closed. Killing thread. */
3159 ret
= check_thread_quit_pipe(pollfd
, revents
);
3164 /* Event on the registration socket */
3165 if (pollfd
== client_sock
) {
3166 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3167 ERR("Client socket poll error");
3173 DBG("Wait for client response");
3175 sock
= lttcomm_accept_unix_sock(client_sock
);
3180 /* Allocate context command to process the client request */
3181 cmd_ctx
= malloc(sizeof(struct command_ctx
));
3182 if (cmd_ctx
== NULL
) {
3183 perror("malloc cmd_ctx");
3187 /* Allocate data buffer for reception */
3188 cmd_ctx
->lsm
= malloc(sizeof(struct lttcomm_session_msg
));
3189 if (cmd_ctx
->lsm
== NULL
) {
3190 perror("malloc cmd_ctx->lsm");
3194 cmd_ctx
->llm
= NULL
;
3195 cmd_ctx
->session
= NULL
;
3198 * Data is received from the lttng client. The struct
3199 * lttcomm_session_msg (lsm) contains the command and data request of
3202 DBG("Receiving data from client ...");
3203 ret
= lttcomm_recv_unix_sock(sock
, cmd_ctx
->lsm
,
3204 sizeof(struct lttcomm_session_msg
));
3206 DBG("Nothing recv() from client... continuing");
3212 // TODO: Validate cmd_ctx including sanity check for
3213 // security purpose.
3215 rcu_thread_online();
3217 * This function dispatch the work to the kernel or userspace tracer
3218 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3219 * informations for the client. The command context struct contains
3220 * everything this function may needs.
3222 ret
= process_client_msg(cmd_ctx
);
3223 rcu_thread_offline();
3226 * TODO: Inform client somehow of the fatal error. At
3227 * this point, ret < 0 means that a malloc failed
3228 * (ENOMEM). Error detected but still accept command.
3230 clean_command_ctx(&cmd_ctx
);
3234 DBG("Sending response (size: %d, retcode: %s)",
3235 cmd_ctx
->lttng_msg_size
,
3236 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3237 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3239 ERR("Failed to send data back to client");
3242 clean_command_ctx(&cmd_ctx
);
3244 /* End of transmission */
3249 DBG("Client thread dying");
3250 unlink(client_unix_sock_path
);
3254 lttng_poll_clean(&events
);
3255 clean_command_ctx(&cmd_ctx
);
3257 rcu_unregister_thread();
3263 * usage function on stderr
3265 static void usage(void)
3267 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3268 fprintf(stderr
, " -h, --help Display this usage.\n");
3269 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3270 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3271 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3272 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3273 fprintf(stderr
, " --ustconsumerd-err-sock PATH Specify path for the UST consumer error socket\n");
3274 fprintf(stderr
, " --ustconsumerd-cmd-sock PATH Specify path for the UST consumer command socket\n");
3275 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3276 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3277 fprintf(stderr
, " -V, --version Show version number.\n");
3278 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3279 fprintf(stderr
, " -q, --quiet No output at all.\n");
3280 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3281 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3285 * daemon argument parsing
3287 static int parse_args(int argc
, char **argv
)
3291 static struct option long_options
[] = {
3292 { "client-sock", 1, 0, 'c' },
3293 { "apps-sock", 1, 0, 'a' },
3294 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3295 { "kconsumerd-err-sock", 1, 0, 'E' },
3296 { "ustconsumerd-cmd-sock", 1, 0, 'D' },
3297 { "ustconsumerd-err-sock", 1, 0, 'F' },
3298 { "daemonize", 0, 0, 'd' },
3299 { "sig-parent", 0, 0, 'S' },
3300 { "help", 0, 0, 'h' },
3301 { "group", 1, 0, 'g' },
3302 { "version", 0, 0, 'V' },
3303 { "quiet", 0, 0, 'q' },
3304 { "verbose", 0, 0, 'v' },
3305 { "verbose-consumer", 0, 0, 'Z' },
3310 int option_index
= 0;
3311 c
= getopt_long(argc
, argv
, "dhqvVS" "a:c:g:s:C:E:D:F:Z",
3312 long_options
, &option_index
);
3319 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3321 fprintf(stderr
, " with arg %s\n", optarg
);
3325 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3328 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3334 opt_tracing_group
= strdup(optarg
);
3340 fprintf(stdout
, "%s\n", VERSION
);
3346 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3349 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3352 snprintf(ustconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3355 snprintf(ustconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3361 /* Verbose level can increase using multiple -v */
3365 opt_verbose_consumer
+= 1;
3368 /* Unknown option or other error.
3369 * Error is printed by getopt, just return */
3378 * Creates the two needed socket by the daemon.
3379 * apps_sock - The communication socket for all UST apps.
3380 * client_sock - The communication of the cli tool (lttng).
3382 static int init_daemon_socket(void)
3387 old_umask
= umask(0);
3389 /* Create client tool unix socket */
3390 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
3391 if (client_sock
< 0) {
3392 ERR("Create unix sock failed: %s", client_unix_sock_path
);
3397 /* File permission MUST be 660 */
3398 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3400 ERR("Set file permissions failed: %s", client_unix_sock_path
);
3405 /* Create the application unix socket */
3406 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
3407 if (apps_sock
< 0) {
3408 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
3413 /* File permission MUST be 666 */
3414 ret
= chmod(apps_unix_sock_path
,
3415 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
3417 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
3428 * Check if the global socket is available, and if a daemon is answering at the
3429 * other side. If yes, error is returned.
3431 static int check_existing_daemon(void)
3433 if (access(client_unix_sock_path
, F_OK
) < 0 &&
3434 access(apps_unix_sock_path
, F_OK
) < 0) {
3438 /* Is there anybody out there ? */
3439 if (lttng_session_daemon_alive()) {
3447 * Set the tracing group gid onto the client socket.
3449 * Race window between mkdir and chown is OK because we are going from more
3450 * permissive (root.root) to les permissive (root.tracing).
3452 static int set_permissions(void)
3457 gid
= allowed_group();
3460 WARN("No tracing group detected");
3463 ERR("Missing tracing group. Aborting execution.");
3469 /* Set lttng run dir */
3470 ret
= chown(LTTNG_RUNDIR
, 0, gid
);
3472 ERR("Unable to set group on " LTTNG_RUNDIR
);
3476 /* lttng client socket path */
3477 ret
= chown(client_unix_sock_path
, 0, gid
);
3479 ERR("Unable to set group on %s", client_unix_sock_path
);
3483 /* kconsumer error socket path */
3484 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
3486 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
3490 /* ustconsumer error socket path */
3491 ret
= chown(ustconsumer_data
.err_unix_sock_path
, 0, gid
);
3493 ERR("Unable to set group on %s", ustconsumer_data
.err_unix_sock_path
);
3497 DBG("All permissions are set");
3504 * Create the pipe used to wake up the kernel thread.
3506 static int create_kernel_poll_pipe(void)
3508 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
3512 * Create the application command pipe to wake thread_manage_apps.
3514 static int create_apps_cmd_pipe(void)
3516 return pipe2(apps_cmd_pipe
, O_CLOEXEC
);
3520 * Create the lttng run directory needed for all global sockets and pipe.
3522 static int create_lttng_rundir(void)
3526 ret
= mkdir(LTTNG_RUNDIR
, S_IRWXU
| S_IRWXG
);
3528 if (errno
!= EEXIST
) {
3529 ERR("Unable to create " LTTNG_RUNDIR
);
3541 * Setup sockets and directory needed by the kconsumerd communication with the
3544 static int set_consumer_sockets(struct consumer_data
*consumer_data
)
3547 const char *path
= consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3548 KCONSUMERD_PATH
: USTCONSUMERD_PATH
;
3550 if (strlen(consumer_data
->err_unix_sock_path
) == 0) {
3551 snprintf(consumer_data
->err_unix_sock_path
, PATH_MAX
,
3552 consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3553 KCONSUMERD_ERR_SOCK_PATH
:
3554 USTCONSUMERD_ERR_SOCK_PATH
);
3557 if (strlen(consumer_data
->cmd_unix_sock_path
) == 0) {
3558 snprintf(consumer_data
->cmd_unix_sock_path
, PATH_MAX
,
3559 consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3560 KCONSUMERD_CMD_SOCK_PATH
:
3561 USTCONSUMERD_CMD_SOCK_PATH
);
3564 ret
= mkdir(path
, S_IRWXU
| S_IRWXG
);
3566 if (errno
!= EEXIST
) {
3567 ERR("Failed to create %s", path
);
3573 /* Create the kconsumerd error unix socket */
3574 consumer_data
->err_sock
=
3575 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
3576 if (consumer_data
->err_sock
< 0) {
3577 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
3582 /* File permission MUST be 660 */
3583 ret
= chmod(consumer_data
->err_unix_sock_path
,
3584 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3586 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
3596 * Signal handler for the daemon
3598 * Simply stop all worker threads, leaving main() return gracefully after
3599 * joining all threads and calling cleanup().
3601 static void sighandler(int sig
)
3605 DBG("SIGPIPE catched");
3608 DBG("SIGINT catched");
3612 DBG("SIGTERM catched");
3621 * Setup signal handler for :
3622 * SIGINT, SIGTERM, SIGPIPE
3624 static int set_signal_handler(void)
3627 struct sigaction sa
;
3630 if ((ret
= sigemptyset(&sigset
)) < 0) {
3631 perror("sigemptyset");
3635 sa
.sa_handler
= sighandler
;
3636 sa
.sa_mask
= sigset
;
3638 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
3639 perror("sigaction");
3643 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
3644 perror("sigaction");
3648 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
3649 perror("sigaction");
3653 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
3659 * Set open files limit to unlimited. This daemon can open a large number of
3660 * file descriptors in order to consumer multiple kernel traces.
3662 static void set_ulimit(void)
3667 /* The kernel does not allowed an infinite limit for open files */
3668 lim
.rlim_cur
= 65535;
3669 lim
.rlim_max
= 65535;
3671 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
3673 perror("failed to set open files limit");
3680 int main(int argc
, char **argv
)
3684 const char *home_path
;
3686 rcu_register_thread();
3688 /* Create thread quit pipe */
3689 if ((ret
= init_thread_quit_pipe()) < 0) {
3693 /* Parse arguments */
3695 if ((ret
= parse_args(argc
, argv
) < 0)) {
3708 /* Check if daemon is UID = 0 */
3709 is_root
= !getuid();
3712 ret
= create_lttng_rundir();
3717 if (strlen(apps_unix_sock_path
) == 0) {
3718 snprintf(apps_unix_sock_path
, PATH_MAX
,
3719 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
3722 if (strlen(client_unix_sock_path
) == 0) {
3723 snprintf(client_unix_sock_path
, PATH_MAX
,
3724 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
3727 /* Set global SHM for ust */
3728 if (strlen(wait_shm_path
) == 0) {
3729 snprintf(wait_shm_path
, PATH_MAX
,
3730 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
3733 home_path
= get_home_dir();
3734 if (home_path
== NULL
) {
3735 /* TODO: Add --socket PATH option */
3736 ERR("Can't get HOME directory for sockets creation.");
3741 if (strlen(apps_unix_sock_path
) == 0) {
3742 snprintf(apps_unix_sock_path
, PATH_MAX
,
3743 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
3746 /* Set the cli tool unix socket path */
3747 if (strlen(client_unix_sock_path
) == 0) {
3748 snprintf(client_unix_sock_path
, PATH_MAX
,
3749 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
3752 /* Set global SHM for ust */
3753 if (strlen(wait_shm_path
) == 0) {
3754 snprintf(wait_shm_path
, PATH_MAX
,
3755 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
3759 DBG("Client socket path %s", client_unix_sock_path
);
3760 DBG("Application socket path %s", apps_unix_sock_path
);
3763 * See if daemon already exist.
3765 if ((ret
= check_existing_daemon()) < 0) {
3766 ERR("Already running daemon.\n");
3768 * We do not goto exit because we must not cleanup()
3769 * because a daemon is already running.
3774 /* After this point, we can safely call cleanup() with "goto exit" */
3777 * These actions must be executed as root. We do that *after* setting up
3778 * the sockets path because we MUST make the check for another daemon using
3779 * those paths *before* trying to set the kernel consumer sockets and init
3783 ret
= set_consumer_sockets(&kconsumer_data
);
3788 ret
= set_consumer_sockets(&ustconsumer_data
);
3792 /* Setup kernel tracer */
3793 init_kernel_tracer();
3795 /* Set ulimit for open files */
3799 if ((ret
= set_signal_handler()) < 0) {
3803 /* Setup the needed unix socket */
3804 if ((ret
= init_daemon_socket()) < 0) {
3808 /* Set credentials to socket */
3809 if (is_root
&& ((ret
= set_permissions()) < 0)) {
3813 /* Get parent pid if -S, --sig-parent is specified. */
3814 if (opt_sig_parent
) {
3818 /* Setup the kernel pipe for waking up the kernel thread */
3819 if ((ret
= create_kernel_poll_pipe()) < 0) {
3823 /* Setup the thread apps communication pipe. */
3824 if ((ret
= create_apps_cmd_pipe()) < 0) {
3828 /* Init UST command queue. */
3829 cds_wfq_init(&ust_cmd_queue
.queue
);
3831 /* Init UST app hash table */
3835 * Get session list pointer. This pointer MUST NOT be free(). This list is
3836 * statically declared in session.c
3838 session_list_ptr
= session_get_list();
3840 /* Set up max poll set size */
3841 lttng_poll_set_max_size();
3843 /* Create thread to manage the client socket */
3844 ret
= pthread_create(&client_thread
, NULL
,
3845 thread_manage_clients
, (void *) NULL
);
3847 perror("pthread_create clients");
3851 /* Create thread to dispatch registration */
3852 ret
= pthread_create(&dispatch_thread
, NULL
,
3853 thread_dispatch_ust_registration
, (void *) NULL
);
3855 perror("pthread_create dispatch");
3859 /* Create thread to manage application registration. */
3860 ret
= pthread_create(®_apps_thread
, NULL
,
3861 thread_registration_apps
, (void *) NULL
);
3863 perror("pthread_create registration");
3867 /* Create thread to manage application socket */
3868 ret
= pthread_create(&apps_thread
, NULL
,
3869 thread_manage_apps
, (void *) NULL
);
3871 perror("pthread_create apps");
3875 /* Create kernel thread to manage kernel event */
3876 ret
= pthread_create(&kernel_thread
, NULL
,
3877 thread_manage_kernel
, (void *) NULL
);
3879 perror("pthread_create kernel");
3883 ret
= pthread_join(kernel_thread
, &status
);
3885 perror("pthread_join");
3886 goto error
; /* join error, exit without cleanup */
3890 ret
= pthread_join(apps_thread
, &status
);
3892 perror("pthread_join");
3893 goto error
; /* join error, exit without cleanup */
3897 ret
= pthread_join(reg_apps_thread
, &status
);
3899 perror("pthread_join");
3900 goto error
; /* join error, exit without cleanup */
3904 ret
= pthread_join(dispatch_thread
, &status
);
3906 perror("pthread_join");
3907 goto error
; /* join error, exit without cleanup */
3911 ret
= pthread_join(client_thread
, &status
);
3913 perror("pthread_join");
3914 goto error
; /* join error, exit without cleanup */
3917 ret
= join_consumer_thread(&kconsumer_data
);
3919 perror("join_consumer");
3920 goto error
; /* join error, exit without cleanup */
3926 * cleanup() is called when no other thread is running.
3928 rcu_thread_online();
3930 rcu_thread_offline();
3931 rcu_unregister_thread();