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 DBG("Removing %s directory", LTTNG_RUNDIR
);
343 ret
= asprintf(&cmd
, "rm -rf " LTTNG_RUNDIR
);
345 ERR("asprintf failed. Something is really wrong!");
348 /* Remove lttng run directory */
351 ERR("Unable to clean " LTTNG_RUNDIR
);
355 DBG("Cleaning up all session");
357 /* Destroy session list mutex */
358 if (session_list_ptr
!= NULL
) {
359 pthread_mutex_destroy(&session_list_ptr
->lock
);
361 /* Cleanup ALL session */
362 cds_list_for_each_entry_safe(sess
, stmp
,
363 &session_list_ptr
->head
, list
) {
364 teardown_kernel_session(sess
);
365 teardown_ust_session(sess
);
370 DBG("Closing all UST sockets");
371 ust_app_clean_list();
373 pthread_mutex_destroy(&kconsumer_data
.pid_mutex
);
375 DBG("Closing kernel fd");
376 close(kernel_tracer_fd
);
379 DBG("Unloading kernel modules");
380 modprobe_remove_kernel_modules();
383 close(thread_quit_pipe
[0]);
384 close(thread_quit_pipe
[1]);
387 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
388 "Matthew, BEET driven development works!%c[%dm",
389 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
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 if (sess
->ust_session
) {
724 ust_app_global_update(sess
->ust_session
, app_sock
);
730 * This thread manage event coming from the kernel.
732 * Features supported in this thread:
735 static void *thread_manage_kernel(void *data
)
737 int ret
, i
, pollfd
, update_poll_flag
= 1;
738 uint32_t revents
, nb_fd
;
740 struct lttng_poll_event events
;
742 DBG("Thread manage kernel started");
744 ret
= create_thread_poll_set(&events
, 2);
749 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
755 if (update_poll_flag
== 1) {
757 * Reset number of fd in the poll set. Always 2 since there is the thread
758 * quit pipe and the kernel pipe.
762 ret
= update_kernel_poll(&events
);
766 update_poll_flag
= 0;
769 nb_fd
= LTTNG_POLL_GETNB(&events
);
771 DBG("Thread kernel polling on %d fds", nb_fd
);
773 /* Zeroed the poll events */
774 lttng_poll_reset(&events
);
776 /* Poll infinite value of time */
777 ret
= lttng_poll_wait(&events
, -1);
780 } else if (ret
== 0) {
781 /* Should not happen since timeout is infinite */
782 ERR("Return value of poll is 0 with an infinite timeout.\n"
783 "This should not have happened! Continuing...");
787 for (i
= 0; i
< nb_fd
; i
++) {
788 /* Fetch once the poll data */
789 revents
= LTTNG_POLL_GETEV(&events
, i
);
790 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
792 /* Thread quit pipe has been closed. Killing thread. */
793 ret
= check_thread_quit_pipe(pollfd
, revents
);
798 /* Check for data on kernel pipe */
799 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
800 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
801 update_poll_flag
= 1;
805 * New CPU detected by the kernel. Adding kernel stream to
806 * kernel session and updating the kernel consumer
808 if (revents
& LPOLLIN
) {
809 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
815 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
816 * and unregister kernel stream at this point.
824 DBG("Kernel thread dying");
825 close(kernel_poll_pipe
[0]);
826 close(kernel_poll_pipe
[1]);
828 lttng_poll_clean(&events
);
834 * This thread manage the consumer error sent back to the session daemon.
836 static void *thread_manage_consumer(void *data
)
838 int sock
= 0, i
, ret
, pollfd
;
839 uint32_t revents
, nb_fd
;
840 enum lttcomm_return_code code
;
841 struct lttng_poll_event events
;
842 struct consumer_data
*consumer_data
= data
;
844 DBG("[thread] Manage consumer started");
846 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
852 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
853 * Nothing more will be added to this poll set.
855 ret
= create_thread_poll_set(&events
, 2);
860 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
865 nb_fd
= LTTNG_POLL_GETNB(&events
);
867 /* Inifinite blocking call, waiting for transmission */
868 ret
= lttng_poll_wait(&events
, -1);
873 for (i
= 0; i
< nb_fd
; i
++) {
874 /* Fetch once the poll data */
875 revents
= LTTNG_POLL_GETEV(&events
, i
);
876 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
878 /* Thread quit pipe has been closed. Killing thread. */
879 ret
= check_thread_quit_pipe(pollfd
, revents
);
884 /* Event on the registration socket */
885 if (pollfd
== consumer_data
->err_sock
) {
886 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
887 ERR("consumer err socket poll error");
893 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
898 DBG2("Receiving code from consumer err_sock");
900 /* Getting status code from kconsumerd */
901 ret
= lttcomm_recv_unix_sock(sock
, &code
,
902 sizeof(enum lttcomm_return_code
));
907 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
908 consumer_data
->cmd_sock
=
909 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
910 if (consumer_data
->cmd_sock
< 0) {
911 sem_post(&consumer_data
->sem
);
912 PERROR("consumer connect");
915 /* Signal condition to tell that the kconsumerd is ready */
916 sem_post(&consumer_data
->sem
);
917 DBG("consumer command socket ready");
919 ERR("consumer error when waiting for SOCK_READY : %s",
920 lttcomm_get_readable_code(-code
));
924 /* Remove the kconsumerd error sock since we've established a connexion */
925 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
930 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
935 /* Update number of fd */
936 nb_fd
= LTTNG_POLL_GETNB(&events
);
938 /* Inifinite blocking call, waiting for transmission */
939 ret
= lttng_poll_wait(&events
, -1);
944 for (i
= 0; i
< nb_fd
; i
++) {
945 /* Fetch once the poll data */
946 revents
= LTTNG_POLL_GETEV(&events
, i
);
947 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
949 /* Thread quit pipe has been closed. Killing thread. */
950 ret
= check_thread_quit_pipe(pollfd
, revents
);
955 /* Event on the kconsumerd socket */
956 if (pollfd
== sock
) {
957 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
958 ERR("consumer err socket second poll error");
964 /* Wait for any kconsumerd error */
965 ret
= lttcomm_recv_unix_sock(sock
, &code
,
966 sizeof(enum lttcomm_return_code
));
968 ERR("consumer closed the command socket");
972 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
975 DBG("consumer thread dying");
976 close(consumer_data
->err_sock
);
977 close(consumer_data
->cmd_sock
);
980 unlink(consumer_data
->err_unix_sock_path
);
981 unlink(consumer_data
->cmd_unix_sock_path
);
982 consumer_data
->pid
= 0;
984 lttng_poll_clean(&events
);
990 * This thread manage application communication.
992 static void *thread_manage_apps(void *data
)
995 uint32_t revents
, nb_fd
;
996 struct ust_command ust_cmd
;
997 struct lttng_poll_event events
;
999 DBG("[thread] Manage application started");
1001 rcu_register_thread();
1002 rcu_thread_online();
1004 ret
= create_thread_poll_set(&events
, 2);
1009 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1015 /* Zeroed the events structure */
1016 lttng_poll_reset(&events
);
1018 nb_fd
= LTTNG_POLL_GETNB(&events
);
1020 DBG("Apps thread polling on %d fds", nb_fd
);
1022 /* Inifinite blocking call, waiting for transmission */
1023 ret
= lttng_poll_wait(&events
, -1);
1028 for (i
= 0; i
< nb_fd
; i
++) {
1029 /* Fetch once the poll data */
1030 revents
= LTTNG_POLL_GETEV(&events
, i
);
1031 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1033 /* Thread quit pipe has been closed. Killing thread. */
1034 ret
= check_thread_quit_pipe(pollfd
, revents
);
1039 /* Inspect the apps cmd pipe */
1040 if (pollfd
== apps_cmd_pipe
[0]) {
1041 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1042 ERR("Apps command pipe error");
1044 } else if (revents
& LPOLLIN
) {
1046 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1047 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1048 perror("read apps cmd pipe");
1052 /* Register applicaton to the session daemon */
1053 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1056 /* Only critical ENOMEM error can be returned here */
1061 * Add channel(s) and event(s) to newly registered apps
1062 * from lttng global UST domain.
1064 update_ust_app(ust_cmd
.sock
);
1066 ret
= ustctl_register_done(ust_cmd
.sock
);
1069 * If the registration is not possible, we simply
1070 * unregister the apps and continue
1072 ust_app_unregister(ust_cmd
.sock
);
1075 * We just need here to monitor the close of the UST
1076 * socket and poll set monitor those by default.
1078 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, 0);
1083 DBG("Apps with sock %d added to poll set",
1091 * At this point, we know that a registered application made
1092 * the event at poll_wait.
1094 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1095 /* Removing from the poll set */
1096 ret
= lttng_poll_del(&events
, pollfd
);
1102 ust_app_unregister(pollfd
);
1110 DBG("Application communication apps dying");
1111 close(apps_cmd_pipe
[0]);
1112 close(apps_cmd_pipe
[1]);
1114 lttng_poll_clean(&events
);
1116 rcu_thread_offline();
1117 rcu_unregister_thread();
1122 * Dispatch request from the registration threads to the application
1123 * communication thread.
1125 static void *thread_dispatch_ust_registration(void *data
)
1128 struct cds_wfq_node
*node
;
1129 struct ust_command
*ust_cmd
= NULL
;
1131 DBG("[thread] Dispatch UST command started");
1133 while (!dispatch_thread_exit
) {
1134 /* Atomically prepare the queue futex */
1135 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1138 /* Dequeue command for registration */
1139 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1141 DBG("Woken up but nothing in the UST command queue");
1142 /* Continue thread execution */
1146 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1148 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1149 " gid:%d sock:%d name:%s (version %d.%d)",
1150 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1151 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1152 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1153 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1155 * Inform apps thread of the new application registration. This
1156 * call is blocking so we can be assured that the data will be read
1157 * at some point in time or wait to the end of the world :)
1159 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1160 sizeof(struct ust_command
));
1162 perror("write apps cmd pipe");
1163 if (errno
== EBADF
) {
1165 * We can't inform the application thread to process
1166 * registration. We will exit or else application
1167 * registration will not occur and tracing will never
1174 } while (node
!= NULL
);
1176 /* Futex wait on queue. Blocking call on futex() */
1177 futex_nto1_wait(&ust_cmd_queue
.futex
);
1181 DBG("Dispatch thread dying");
1186 * This thread manage application registration.
1188 static void *thread_registration_apps(void *data
)
1190 int sock
= 0, i
, ret
, pollfd
;
1191 uint32_t revents
, nb_fd
;
1192 struct lttng_poll_event events
;
1194 * Get allocated in this thread, enqueued to a global queue, dequeued and
1195 * freed in the manage apps thread.
1197 struct ust_command
*ust_cmd
= NULL
;
1199 DBG("[thread] Manage application registration started");
1201 ret
= lttcomm_listen_unix_sock(apps_sock
);
1207 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1208 * more will be added to this poll set.
1210 ret
= create_thread_poll_set(&events
, 2);
1215 /* Add the application registration socket */
1216 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1221 /* Notify all applications to register */
1222 ret
= notify_ust_apps(1);
1224 ERR("Failed to notify applications or create the wait shared memory.\n"
1225 "Execution continues but there might be problem for already\n"
1226 "running applications that wishes to register.");
1230 DBG("Accepting application registration");
1232 nb_fd
= LTTNG_POLL_GETNB(&events
);
1234 /* Inifinite blocking call, waiting for transmission */
1235 ret
= lttng_poll_wait(&events
, -1);
1240 for (i
= 0; i
< nb_fd
; i
++) {
1241 /* Fetch once the poll data */
1242 revents
= LTTNG_POLL_GETEV(&events
, i
);
1243 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1245 /* Thread quit pipe has been closed. Killing thread. */
1246 ret
= check_thread_quit_pipe(pollfd
, revents
);
1251 /* Event on the registration socket */
1252 if (pollfd
== apps_sock
) {
1253 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1254 ERR("Register apps socket poll error");
1256 } else if (revents
& LPOLLIN
) {
1257 sock
= lttcomm_accept_unix_sock(apps_sock
);
1262 /* Create UST registration command for enqueuing */
1263 ust_cmd
= malloc(sizeof(struct ust_command
));
1264 if (ust_cmd
== NULL
) {
1265 perror("ust command malloc");
1270 * Using message-based transmissions to ensure we don't
1271 * have to deal with partially received messages.
1273 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1274 sizeof(struct ust_register_msg
));
1275 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1277 perror("lttcomm_recv_unix_sock register apps");
1279 ERR("Wrong size received on apps register");
1286 ust_cmd
->sock
= sock
;
1288 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1289 " gid:%d sock:%d name:%s (version %d.%d)",
1290 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1291 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1292 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1293 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1296 * Lock free enqueue the registration request. The red pill
1297 * has been taken! This apps will be part of the *system*.
1299 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1302 * Wake the registration queue futex. Implicit memory
1303 * barrier with the exchange in cds_wfq_enqueue.
1305 futex_nto1_wake(&ust_cmd_queue
.futex
);
1312 DBG("UST Registration thread dying");
1314 /* Notify that the registration thread is gone */
1319 unlink(apps_unix_sock_path
);
1321 lttng_poll_clean(&events
);
1327 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1328 * exec or it will fails.
1330 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1333 struct timespec timeout
;
1335 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1336 timeout
.tv_nsec
= 0;
1338 /* Setup semaphore */
1339 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1341 PERROR("sem_init consumer semaphore");
1345 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1346 thread_manage_consumer
, consumer_data
);
1348 PERROR("pthread_create consumer");
1353 /* Get time for sem_timedwait absolute timeout */
1354 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1356 PERROR("clock_gettime spawn consumer");
1357 /* Infinite wait for the kconsumerd thread to be ready */
1358 ret
= sem_wait(&consumer_data
->sem
);
1360 /* Normal timeout if the gettime was successful */
1361 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1362 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1366 if (errno
== ETIMEDOUT
) {
1368 * Call has timed out so we kill the kconsumerd_thread and return
1371 ERR("The consumer thread was never ready. Killing it");
1372 ret
= pthread_cancel(consumer_data
->thread
);
1374 PERROR("pthread_cancel consumer thread");
1377 PERROR("semaphore wait failed consumer thread");
1382 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1383 if (consumer_data
->pid
== 0) {
1384 ERR("Kconsumerd did not start");
1385 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1388 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1397 * Join consumer thread
1399 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1404 if (consumer_data
->pid
!= 0) {
1405 ret
= kill(consumer_data
->pid
, SIGTERM
);
1407 ERR("Error killing consumer daemon");
1410 return pthread_join(consumer_data
->thread
, &status
);
1417 * Fork and exec a consumer daemon (consumerd).
1419 * Return pid if successful else -1.
1421 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1425 const char *verbosity
;
1427 DBG("Spawning consumerd");
1434 if (opt_verbose
> 1 || opt_verbose_consumer
) {
1435 verbosity
= "--verbose";
1437 verbosity
= "--quiet";
1439 switch (consumer_data
->type
) {
1440 case LTTNG_CONSUMER_KERNEL
:
1441 execl(INSTALL_BIN_PATH
"/lttng-consumerd",
1442 "lttng-consumerd", verbosity
, "-k", NULL
);
1444 case LTTNG_CONSUMER_UST
:
1445 execl(INSTALL_BIN_PATH
"/lttng-consumerd",
1446 "lttng-consumerd", verbosity
, "-u", NULL
);
1449 perror("unknown consumer type");
1453 perror("kernel start consumer exec");
1456 } else if (pid
> 0) {
1459 perror("start consumer fork");
1466 * Spawn the consumerd daemon and session daemon thread.
1468 static int start_consumerd(struct consumer_data
*consumer_data
)
1472 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1473 if (consumer_data
->pid
!= 0) {
1474 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1478 ret
= spawn_consumerd(consumer_data
);
1480 ERR("Spawning consumerd failed");
1481 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1485 /* Setting up the consumer_data pid */
1486 consumer_data
->pid
= ret
;
1487 DBG2("Consumer pid %d", consumer_data
->pid
);
1488 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1490 DBG2("Spawning consumer control thread");
1491 ret
= spawn_consumer_thread(consumer_data
);
1493 ERR("Fatal error spawning consumer control thread");
1505 * modprobe_kernel_modules
1507 static int modprobe_kernel_modules(void)
1512 for (i
= 0; i
< ARRAY_SIZE(kernel_modules_list
); i
++) {
1513 ret
= snprintf(modprobe
, sizeof(modprobe
),
1514 "/sbin/modprobe %s%s",
1515 kernel_modules_list
[i
].required
? "" : "-q ",
1516 kernel_modules_list
[i
].name
);
1518 perror("snprintf modprobe");
1521 modprobe
[sizeof(modprobe
) - 1] = '\0';
1522 ret
= system(modprobe
);
1524 ERR("Unable to launch modprobe for module %s",
1525 kernel_modules_list
[i
].name
);
1526 } else if (kernel_modules_list
[i
].required
1527 && WEXITSTATUS(ret
) != 0) {
1528 ERR("Unable to load module %s",
1529 kernel_modules_list
[i
].name
);
1531 DBG("Modprobe successfully %s",
1532 kernel_modules_list
[i
].name
);
1543 static int mount_debugfs(char *path
)
1546 char *type
= "debugfs";
1548 ret
= mkdir_recursive(path
, S_IRWXU
| S_IRWXG
, geteuid(), getegid());
1550 PERROR("Cannot create debugfs path");
1554 ret
= mount(type
, path
, type
, 0, NULL
);
1556 PERROR("Cannot mount debugfs");
1560 DBG("Mounted debugfs successfully at %s", path
);
1567 * Setup necessary data for kernel tracer action.
1569 static void init_kernel_tracer(void)
1572 char *proc_mounts
= "/proc/mounts";
1574 char *debugfs_path
= NULL
, *lttng_path
= NULL
;
1577 /* Detect debugfs */
1578 fp
= fopen(proc_mounts
, "r");
1580 ERR("Unable to probe %s", proc_mounts
);
1584 while (fgets(line
, sizeof(line
), fp
) != NULL
) {
1585 if (strstr(line
, "debugfs") != NULL
) {
1586 /* Remove first string */
1588 /* Dup string here so we can reuse line later on */
1589 debugfs_path
= strdup(strtok(NULL
, " "));
1590 DBG("Got debugfs path : %s", debugfs_path
);
1597 /* Mount debugfs if needded */
1598 if (debugfs_path
== NULL
) {
1599 ret
= asprintf(&debugfs_path
, "/mnt/debugfs");
1601 perror("asprintf debugfs path");
1604 ret
= mount_debugfs(debugfs_path
);
1606 perror("Cannot mount debugfs");
1611 /* Modprobe lttng kernel modules */
1612 ret
= modprobe_kernel_modules();
1617 /* Setup lttng kernel path */
1618 ret
= asprintf(<tng_path
, "%s/lttng", debugfs_path
);
1620 perror("asprintf lttng path");
1624 /* Open debugfs lttng */
1625 kernel_tracer_fd
= open(lttng_path
, O_RDWR
);
1626 if (kernel_tracer_fd
< 0) {
1627 DBG("Failed to open %s", lttng_path
);
1633 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1643 WARN("No kernel tracer available");
1644 kernel_tracer_fd
= 0;
1649 * Init tracing by creating trace directory and sending fds kernel consumer.
1651 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
1655 if (session
->consumer_fds_sent
== 0) {
1657 * Assign default kernel consumer socket if no consumer assigned to the
1658 * kernel session. At this point, it's NOT suppose to be 0 but this is
1659 * an extra security check.
1661 if (session
->consumer_fd
== 0) {
1662 session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1665 ret
= send_kconsumer_session_streams(&kconsumer_data
, session
);
1667 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1671 session
->consumer_fds_sent
= 1;
1679 * Create an UST session and add it to the session ust list.
1681 static int create_ust_session(struct ltt_session
*session
,
1682 struct lttng_domain
*domain
)
1686 struct ltt_ust_session
*lus
= NULL
;
1688 switch (domain
->type
) {
1689 case LTTNG_DOMAIN_UST
:
1692 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1696 DBG("Creating UST session");
1698 session_lock_list();
1699 uid
= session_list_ptr
->count
;
1700 session_unlock_list();
1702 lus
= trace_ust_create_session(session
->path
, uid
, domain
);
1704 ret
= LTTCOMM_UST_SESS_FAIL
;
1708 ret
= mkdir_recursive(lus
->pathname
, S_IRWXU
| S_IRWXG
,
1709 geteuid(), allowed_group());
1711 if (ret
!= -EEXIST
) {
1712 ERR("Trace directory creation error");
1713 ret
= LTTCOMM_UST_SESS_FAIL
;
1718 /* The domain type dictate different actions on session creation */
1719 switch (domain
->type
) {
1720 case LTTNG_DOMAIN_UST
:
1721 /* No ustctl for the global UST domain */
1724 ERR("Unknown UST domain on create session %d", domain
->type
);
1727 session
->ust_session
= lus
;
1737 * Create a kernel tracer session then create the default channel.
1739 static int create_kernel_session(struct ltt_session
*session
)
1743 DBG("Creating kernel session");
1745 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1747 ret
= LTTCOMM_KERN_SESS_FAIL
;
1751 /* Set kernel consumer socket fd */
1752 if (kconsumer_data
.cmd_sock
) {
1753 session
->kernel_session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1756 ret
= mkdir_recursive(session
->kernel_session
->trace_path
,
1757 S_IRWXU
| S_IRWXG
, geteuid(), allowed_group());
1759 if (ret
!= -EEXIST
) {
1760 ERR("Trace directory creation error");
1770 * Using the session list, filled a lttng_session array to send back to the
1771 * client for session listing.
1773 * The session list lock MUST be acquired before calling this function. Use
1774 * session_lock_list() and session_unlock_list().
1776 static void list_lttng_sessions(struct lttng_session
*sessions
)
1779 struct ltt_session
*session
;
1781 DBG("Getting all available session");
1783 * Iterate over session list and append data after the control struct in
1786 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1787 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
1788 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
1789 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
1790 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
1796 * Fill lttng_channel array of all channels.
1798 static void list_lttng_channels(struct ltt_session
*session
,
1799 struct lttng_channel
*channels
)
1802 struct ltt_kernel_channel
*kchan
;
1804 DBG("Listing channels for session %s", session
->name
);
1806 /* Kernel channels */
1807 if (session
->kernel_session
!= NULL
) {
1808 cds_list_for_each_entry(kchan
,
1809 &session
->kernel_session
->channel_list
.head
, list
) {
1810 /* Copy lttng_channel struct to array */
1811 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
1812 channels
[i
].enabled
= kchan
->enabled
;
1817 /* TODO: Missing UST listing */
1821 * Fill lttng_event array of all events in the channel.
1823 static void list_lttng_events(struct ltt_kernel_channel
*kchan
,
1824 struct lttng_event
*events
)
1827 * TODO: This is ONLY kernel. Need UST support.
1830 struct ltt_kernel_event
*event
;
1832 DBG("Listing events for channel %s", kchan
->channel
->name
);
1834 /* Kernel channels */
1835 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
1836 strncpy(events
[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
1837 events
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1838 events
[i
].enabled
= event
->enabled
;
1839 switch (event
->event
->instrumentation
) {
1840 case LTTNG_KERNEL_TRACEPOINT
:
1841 events
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1843 case LTTNG_KERNEL_KPROBE
:
1844 case LTTNG_KERNEL_KRETPROBE
:
1845 events
[i
].type
= LTTNG_EVENT_PROBE
;
1846 memcpy(&events
[i
].attr
.probe
, &event
->event
->u
.kprobe
,
1847 sizeof(struct lttng_kernel_kprobe
));
1849 case LTTNG_KERNEL_FUNCTION
:
1850 events
[i
].type
= LTTNG_EVENT_FUNCTION
;
1851 memcpy(&events
[i
].attr
.ftrace
, &event
->event
->u
.ftrace
,
1852 sizeof(struct lttng_kernel_function
));
1854 case LTTNG_KERNEL_NOOP
:
1855 events
[i
].type
= LTTNG_EVENT_NOOP
;
1857 case LTTNG_KERNEL_SYSCALL
:
1858 events
[i
].type
= LTTNG_EVENT_SYSCALL
;
1860 case LTTNG_KERNEL_ALL
:
1869 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1871 static int cmd_disable_channel(struct ltt_session
*session
,
1872 int domain
, char *channel_name
)
1877 case LTTNG_DOMAIN_KERNEL
:
1878 ret
= channel_kernel_disable(session
->kernel_session
,
1880 if (ret
!= LTTCOMM_OK
) {
1884 kernel_wait_quiescent(kernel_tracer_fd
);
1886 case LTTNG_DOMAIN_UST_PID
:
1889 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1900 * Copy channel from attributes and set it in the application channel list.
1903 static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
1904 struct lttng_channel *attr, struct ust_app *app)
1907 struct ltt_ust_channel *uchan, *new_chan;
1909 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
1910 if (uchan == NULL) {
1911 ret = LTTCOMM_FATAL;
1915 new_chan = trace_ust_create_channel(attr, usess->path);
1916 if (new_chan == NULL) {
1917 PERROR("malloc ltt_ust_channel");
1918 ret = LTTCOMM_FATAL;
1922 ret = channel_ust_copy(new_chan, uchan);
1924 ret = LTTCOMM_FATAL;
1934 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1936 static int cmd_enable_channel(struct ltt_session
*session
,
1937 struct lttng_domain
*domain
, struct lttng_channel
*attr
)
1940 struct ltt_ust_session
*usess
= session
->ust_session
;
1942 DBG("Enabling channel %s for session %s", session
->name
, attr
->name
);
1944 switch (domain
->type
) {
1945 case LTTNG_DOMAIN_KERNEL
:
1947 struct ltt_kernel_channel
*kchan
;
1949 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
1950 session
->kernel_session
);
1951 if (kchan
== NULL
) {
1952 ret
= channel_kernel_create(session
->kernel_session
,
1953 attr
, kernel_poll_pipe
[1]);
1955 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
1958 if (ret
!= LTTCOMM_OK
) {
1962 kernel_wait_quiescent(kernel_tracer_fd
);
1965 case LTTNG_DOMAIN_UST
:
1967 struct ltt_ust_channel
*uchan
;
1969 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
1971 /* Get channel in global UST domain HT */
1972 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1974 if (uchan
== NULL
) {
1975 uchan
= trace_ust_create_channel(attr
, usess
->pathname
);
1976 if (uchan
== NULL
) {
1977 ret
= LTTCOMM_UST_CHAN_FAIL
;
1981 hashtable_add_unique(usess
->domain_global
.channels
, &uchan
->node
);
1983 DBG2("UST channel %s added to global domain HT", attr
->name
);
1985 ret
= LTTCOMM_UST_CHAN_EXIST
;
1989 /* Add channel to all registered applications */
1990 ret
= ust_app_add_channel_all(usess
, uchan
);
1991 if (ret
!= LTTCOMM_OK
) {
1997 case LTTNG_DOMAIN_UST_PID
:
2001 struct ltt_ust_channel *uchan;
2002 struct ltt_ust_session *usess;
2003 struct ust_app *app;
2005 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
2007 if (usess == NULL) {
2008 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2012 app = ust_app_get_by_pid(domain->attr.pid);
2014 ret = LTTCOMM_APP_NOT_FOUND;
2019 uchan = trace_ust_get_channel_by_name(attr->name, usess);
2020 if (uchan == NULL) {
2021 ret = channel_ust_create(usess, attr, sock);
2023 ret = channel_ust_enable(usess, uchan, sock);
2026 if (ret != LTTCOMM_OK) {
2030 ret = copy_ust_channel_to_app(usess, attr, app);
2031 if (ret != LTTCOMM_OK) {
2035 DBG("UST channel %s created for app sock %d with pid %d",
2036 attr->name, app->sock, domain->attr.pid);
2038 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2042 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2053 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2055 static int cmd_disable_event(struct ltt_session
*session
, int domain
,
2056 char *channel_name
, char *event_name
)
2061 case LTTNG_DOMAIN_KERNEL
:
2063 struct ltt_kernel_channel
*kchan
;
2065 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2066 session
->kernel_session
);
2067 if (kchan
== NULL
) {
2068 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2072 ret
= event_kernel_disable_tracepoint(session
->kernel_session
, kchan
, event_name
);
2073 if (ret
!= LTTCOMM_OK
) {
2077 kernel_wait_quiescent(kernel_tracer_fd
);
2080 case LTTNG_DOMAIN_UST
:
2081 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2082 case LTTNG_DOMAIN_UST_PID
:
2083 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2085 /* TODO: Other UST domains */
2086 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2097 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2099 static int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
2103 struct ltt_kernel_channel
*kchan
;
2106 case LTTNG_DOMAIN_KERNEL
:
2107 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2108 session
->kernel_session
);
2109 if (kchan
== NULL
) {
2110 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2114 ret
= event_kernel_disable_all(session
->kernel_session
, kchan
);
2115 if (ret
!= LTTCOMM_OK
) {
2119 kernel_wait_quiescent(kernel_tracer_fd
);
2122 /* TODO: Userspace tracing */
2123 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2134 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2136 static int cmd_add_context(struct ltt_session
*session
, int domain
,
2137 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
2142 case LTTNG_DOMAIN_KERNEL
:
2143 /* Add kernel context to kernel tracer */
2144 ret
= context_kernel_add(session
->kernel_session
, ctx
,
2145 event_name
, channel_name
);
2146 if (ret
!= LTTCOMM_OK
) {
2150 case LTTNG_DOMAIN_UST
:
2153 struct ltt_ust_session *usess;
2155 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2156 ret = context_ust_add(usess, ctx,
2157 event_name, channel_name, domain);
2158 if (ret != LTTCOMM_OK) {
2166 /* TODO: UST other domains */
2167 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2178 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2180 static int cmd_enable_event(struct ltt_session
*session
, int domain
,
2181 char *channel_name
, struct lttng_event
*event
)
2184 struct lttng_channel
*attr
;
2185 struct ltt_ust_session
*usess
= session
->ust_session
;
2188 case LTTNG_DOMAIN_KERNEL
:
2190 struct ltt_kernel_channel
*kchan
;
2192 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2193 session
->kernel_session
);
2194 if (kchan
== NULL
) {
2195 attr
= channel_new_default_attr(domain
);
2197 ret
= LTTCOMM_FATAL
;
2200 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2202 /* This call will notify the kernel thread */
2203 ret
= channel_kernel_create(session
->kernel_session
,
2204 attr
, kernel_poll_pipe
[1]);
2205 if (ret
!= LTTCOMM_OK
) {
2210 /* Get the newly created kernel channel pointer */
2211 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2212 session
->kernel_session
);
2213 if (kchan
== NULL
) {
2214 /* This sould not happen... */
2215 ret
= LTTCOMM_FATAL
;
2219 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
2221 if (ret
!= LTTCOMM_OK
) {
2225 kernel_wait_quiescent(kernel_tracer_fd
);
2228 case LTTNG_DOMAIN_UST
:
2230 struct ltt_ust_channel
*uchan
;
2231 struct ltt_ust_event
*uevent
;
2233 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2235 if (uchan
== NULL
) {
2236 /* TODO: Create default channel */
2237 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2241 uevent
= trace_ust_find_event_by_name(uchan
->events
, event
->name
);
2242 if (uevent
== NULL
) {
2243 uevent
= trace_ust_create_event(event
);
2244 if (uevent
== NULL
) {
2245 ret
= LTTCOMM_FATAL
;
2250 ret
= ust_app_add_event_all(usess
, uchan
, uevent
);
2252 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2257 hashtable_add_unique(uchan
->events
, &uevent
->node
);
2261 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2262 case LTTNG_DOMAIN_UST_PID
:
2263 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2265 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2276 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2278 static int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
2279 char *channel_name
, int event_type
)
2282 struct ltt_kernel_channel
*kchan
;
2285 case LTTNG_DOMAIN_KERNEL
:
2286 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2287 session
->kernel_session
);
2288 if (kchan
== NULL
) {
2289 /* This call will notify the kernel thread */
2290 ret
= channel_kernel_create(session
->kernel_session
, NULL
,
2291 kernel_poll_pipe
[1]);
2292 if (ret
!= LTTCOMM_OK
) {
2297 /* Get the newly created kernel channel pointer */
2298 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2299 session
->kernel_session
);
2300 if (kchan
== NULL
) {
2301 /* This sould not happen... */
2302 ret
= LTTCOMM_FATAL
;
2306 switch (event_type
) {
2307 case LTTNG_KERNEL_SYSCALL
:
2308 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
2309 kchan
, kernel_tracer_fd
);
2311 case LTTNG_KERNEL_TRACEPOINT
:
2313 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2314 * events already registered to the channel.
2316 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
2317 kchan
, kernel_tracer_fd
);
2319 case LTTNG_KERNEL_ALL
:
2320 /* Enable syscalls and tracepoints */
2321 ret
= event_kernel_enable_all(session
->kernel_session
,
2322 kchan
, kernel_tracer_fd
);
2325 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2328 if (ret
!= LTTCOMM_OK
) {
2332 kernel_wait_quiescent(kernel_tracer_fd
);
2335 /* TODO: Userspace tracing */
2336 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2347 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2349 static ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
2352 ssize_t nb_events
= 0;
2355 case LTTNG_DOMAIN_KERNEL
:
2356 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2357 if (nb_events
< 0) {
2358 ret
= LTTCOMM_KERN_LIST_FAIL
;
2363 /* TODO: Userspace listing */
2364 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2371 /* Return negative value to differentiate return code */
2376 * Command LTTNG_START_TRACE processed by the client thread.
2378 static int cmd_start_trace(struct ltt_session
*session
)
2381 struct ltt_kernel_session
*ksession
;
2382 struct ltt_ust_session
*usess
= session
->ust_session
;
2385 ksession
= session
->kernel_session
;
2387 /* Kernel tracing */
2388 if (ksession
!= NULL
) {
2389 struct ltt_kernel_channel
*kchan
;
2391 /* Open kernel metadata */
2392 if (ksession
->metadata
== NULL
) {
2393 ret
= kernel_open_metadata(ksession
, ksession
->trace_path
);
2395 ret
= LTTCOMM_KERN_META_FAIL
;
2400 /* Open kernel metadata stream */
2401 if (ksession
->metadata_stream_fd
== 0) {
2402 ret
= kernel_open_metadata_stream(ksession
);
2404 ERR("Kernel create metadata stream failed");
2405 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2410 /* For each channel */
2411 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2412 if (kchan
->stream_count
== 0) {
2413 ret
= kernel_open_channel_stream(kchan
);
2415 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2418 /* Update the stream global counter */
2419 ksession
->stream_count_global
+= ret
;
2423 /* Setup kernel consumer socket and send fds to it */
2424 ret
= init_kernel_tracing(ksession
);
2426 ret
= LTTCOMM_KERN_START_FAIL
;
2430 /* This start the kernel tracing */
2431 ret
= kernel_start_session(ksession
);
2433 ret
= LTTCOMM_KERN_START_FAIL
;
2437 /* Quiescent wait after starting trace */
2438 kernel_wait_quiescent(kernel_tracer_fd
);
2441 /* Flag session that trace should start automatically */
2442 usess
->start_trace
= 1;
2444 ret
= ust_app_start_trace_all(usess
);
2446 ret
= LTTCOMM_UST_START_FAIL
;
2457 * Command LTTNG_STOP_TRACE processed by the client thread.
2459 static int cmd_stop_trace(struct ltt_session
*session
)
2462 struct ltt_kernel_channel
*kchan
;
2463 struct ltt_kernel_session
*ksession
;
2464 //struct ltt_ust_session *usess;
2465 //struct ltt_ust_channel *ustchan;
2468 ksession
= session
->kernel_session
;
2471 if (ksession
!= NULL
) {
2472 DBG("Stop kernel tracing");
2474 /* Flush all buffers before stopping */
2475 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2477 ERR("Kernel metadata flush failed");
2480 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2481 ret
= kernel_flush_buffer(kchan
);
2483 ERR("Kernel flush buffer error");
2487 ret
= kernel_stop_session(ksession
);
2489 ret
= LTTCOMM_KERN_STOP_FAIL
;
2493 kernel_wait_quiescent(kernel_tracer_fd
);
2497 /* Stop each UST session */
2498 DBG("Stop UST tracing");
2499 cds_list_for_each_entry(usess
, &session
->ust_session_list
.head
, list
) {
2500 /* Flush all buffers before stopping */
2501 ret
= ustctl_flush_buffer(usess
->sock
, usess
->metadata
->obj
);
2503 ERR("UST metadata flush failed");
2506 cds_list_for_each_entry(ustchan
, &usess
->channels
.head
, list
) {
2507 ret
= ustctl_flush_buffer(usess
->sock
, ustchan
->obj
);
2509 ERR("UST flush buffer error");
2513 ret
= ustctl_stop_session(usess
->sock
, usess
->handle
);
2515 ret
= LTTCOMM_KERN_STOP_FAIL
;
2519 ustctl_wait_quiescent(usess
->sock
);
2530 * Command LTTNG_CREATE_SESSION processed by the client thread.
2532 static int cmd_create_session(char *name
, char *path
)
2536 ret
= session_create(name
, path
);
2537 if (ret
!= LTTCOMM_OK
) {
2548 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2550 static int cmd_destroy_session(struct ltt_session
*session
, char *name
)
2554 /* Clean kernel session teardown */
2555 teardown_kernel_session(session
);
2558 * Must notify the kernel thread here to update it's poll setin order
2559 * to remove the channel(s)' fd just destroyed.
2561 ret
= notify_thread_pipe(kernel_poll_pipe
[1]);
2563 perror("write kernel poll pipe");
2566 ret
= session_destroy(session
);
2572 * Command LTTNG_CALIBRATE processed by the client thread.
2574 static int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
2579 case LTTNG_DOMAIN_KERNEL
:
2581 struct lttng_kernel_calibrate kcalibrate
;
2583 kcalibrate
.type
= calibrate
->type
;
2584 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2586 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2592 /* TODO: Userspace tracing */
2593 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2604 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2606 static int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2612 case LTTNG_DOMAIN_KERNEL
:
2613 /* Can't register a consumer if there is already one */
2614 if (session
->kernel_session
->consumer_fd
!= 0) {
2615 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2619 sock
= lttcomm_connect_unix_sock(sock_path
);
2621 ret
= LTTCOMM_CONNECT_FAIL
;
2625 session
->kernel_session
->consumer_fd
= sock
;
2628 /* TODO: Userspace tracing */
2629 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2640 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2642 static ssize_t
cmd_list_domains(struct ltt_session
*session
,
2643 struct lttng_domain
**domains
)
2648 if (session
->kernel_session
!= NULL
) {
2652 /* TODO: User-space tracer domain support */
2654 *domains
= malloc(nb_dom
* sizeof(struct lttng_domain
));
2655 if (*domains
== NULL
) {
2656 ret
= -LTTCOMM_FATAL
;
2660 (*domains
)[0].type
= LTTNG_DOMAIN_KERNEL
;
2669 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2671 static ssize_t
cmd_list_channels(struct ltt_session
*session
,
2672 struct lttng_channel
**channels
)
2675 ssize_t nb_chan
= 0;
2677 if (session
->kernel_session
!= NULL
) {
2678 nb_chan
+= session
->kernel_session
->channel_count
;
2681 *channels
= malloc(nb_chan
* sizeof(struct lttng_channel
));
2682 if (*channels
== NULL
) {
2683 ret
= -LTTCOMM_FATAL
;
2687 list_lttng_channels(session
, *channels
);
2689 /* TODO UST support */
2698 * Command LTTNG_LIST_EVENTS processed by the client thread.
2700 static ssize_t
cmd_list_events(struct ltt_session
*session
,
2701 char *channel_name
, struct lttng_event
**events
)
2704 ssize_t nb_event
= 0;
2705 struct ltt_kernel_channel
*kchan
= NULL
;
2707 if (session
->kernel_session
!= NULL
) {
2708 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2709 session
->kernel_session
);
2710 if (kchan
== NULL
) {
2711 ret
= -LTTCOMM_KERN_CHAN_NOT_FOUND
;
2714 nb_event
+= kchan
->event_count
;
2717 *events
= malloc(nb_event
* sizeof(struct lttng_event
));
2718 if (*events
== NULL
) {
2719 ret
= -LTTCOMM_FATAL
;
2723 list_lttng_events(kchan
, *events
);
2725 /* TODO: User-space tracer support */
2734 * Process the command requested by the lttng client within the command
2735 * context structure. This function make sure that the return structure (llm)
2736 * is set and ready for transmission before returning.
2738 * Return any error encountered or 0 for success.
2740 static int process_client_msg(struct command_ctx
*cmd_ctx
)
2742 int ret
= LTTCOMM_OK
;
2743 int need_tracing_session
= 1;
2745 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2748 * Check for command that don't needs to allocate a returned payload. We do
2749 * this here so we don't have to make the call for no payload at each
2752 switch(cmd_ctx
->lsm
->cmd_type
) {
2753 case LTTNG_LIST_SESSIONS
:
2754 case LTTNG_LIST_TRACEPOINTS
:
2755 case LTTNG_LIST_DOMAINS
:
2756 case LTTNG_LIST_CHANNELS
:
2757 case LTTNG_LIST_EVENTS
:
2760 /* Setup lttng message with no payload */
2761 ret
= setup_lttng_msg(cmd_ctx
, 0);
2763 /* This label does not try to unlock the session */
2764 goto init_setup_error
;
2768 /* Commands that DO NOT need a session. */
2769 switch (cmd_ctx
->lsm
->cmd_type
) {
2770 case LTTNG_CALIBRATE
:
2771 case LTTNG_CREATE_SESSION
:
2772 case LTTNG_LIST_SESSIONS
:
2773 case LTTNG_LIST_TRACEPOINTS
:
2774 need_tracing_session
= 0;
2777 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
2778 session_lock_list();
2779 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
2780 session_unlock_list();
2781 if (cmd_ctx
->session
== NULL
) {
2782 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
2783 ret
= LTTCOMM_SESS_NOT_FOUND
;
2785 /* If no session name specified */
2786 ret
= LTTCOMM_SELECT_SESS
;
2790 /* Acquire lock for the session */
2791 session_lock(cmd_ctx
->session
);
2797 * Check domain type for specific "pre-action".
2799 switch (cmd_ctx
->lsm
->domain
.type
) {
2800 case LTTNG_DOMAIN_KERNEL
:
2801 /* Kernel tracer check */
2802 if (kernel_tracer_fd
== 0) {
2803 /* Basically, load kernel tracer modules */
2804 init_kernel_tracer();
2805 if (kernel_tracer_fd
== 0) {
2806 ret
= LTTCOMM_KERN_NA
;
2811 /* Need a session for kernel command */
2812 if (need_tracing_session
) {
2813 if (cmd_ctx
->session
->kernel_session
== NULL
) {
2814 ret
= create_kernel_session(cmd_ctx
->session
);
2816 ret
= LTTCOMM_KERN_SESS_FAIL
;
2821 /* Start the kernel consumer daemon */
2822 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2823 if (kconsumer_data
.pid
== 0 &&
2824 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2825 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2826 ret
= start_consumerd(&kconsumer_data
);
2828 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2832 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2835 case LTTNG_DOMAIN_UST
:
2837 if (need_tracing_session
) {
2838 if (cmd_ctx
->session
->ust_session
== NULL
) {
2839 ret
= create_ust_session(cmd_ctx
->session
,
2840 &cmd_ctx
->lsm
->domain
);
2841 if (ret
!= LTTCOMM_OK
) {
2845 /* Start the kernel consumer daemon */
2846 pthread_mutex_lock(&ustconsumer_data
.pid_mutex
);
2847 if (ustconsumer_data
.pid
== 0 &&
2848 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2849 pthread_mutex_unlock(&ustconsumer_data
.pid_mutex
);
2850 ret
= start_consumerd(&ustconsumer_data
);
2852 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2856 cmd_ctx
->session
->ust_session
->consumer_fd
=
2857 ustconsumer_data
.cmd_sock
;
2859 pthread_mutex_unlock(&ustconsumer_data
.pid_mutex
);
2867 /* Process by command type */
2868 switch (cmd_ctx
->lsm
->cmd_type
) {
2869 case LTTNG_ADD_CONTEXT
:
2871 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2872 cmd_ctx
->lsm
->u
.context
.channel_name
,
2873 cmd_ctx
->lsm
->u
.context
.event_name
,
2874 &cmd_ctx
->lsm
->u
.context
.ctx
);
2877 case LTTNG_DISABLE_CHANNEL
:
2879 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2880 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2883 case LTTNG_DISABLE_EVENT
:
2885 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2886 cmd_ctx
->lsm
->u
.disable
.channel_name
,
2887 cmd_ctx
->lsm
->u
.disable
.name
);
2891 case LTTNG_DISABLE_ALL_EVENT
:
2893 DBG("Disabling all events");
2895 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2896 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2899 case LTTNG_ENABLE_CHANNEL
:
2901 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2902 &cmd_ctx
->lsm
->u
.channel
.chan
);
2905 case LTTNG_ENABLE_EVENT
:
2907 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2908 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2909 &cmd_ctx
->lsm
->u
.enable
.event
);
2912 case LTTNG_ENABLE_ALL_EVENT
:
2914 DBG("Enabling all events");
2916 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2917 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2918 cmd_ctx
->lsm
->u
.enable
.event
.type
);
2921 case LTTNG_LIST_TRACEPOINTS
:
2923 struct lttng_event
*events
;
2926 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
2927 if (nb_events
< 0) {
2933 * Setup lttng message with payload size set to the event list size in
2934 * bytes and then copy list into the llm payload.
2936 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
2942 /* Copy event list into message payload */
2943 memcpy(cmd_ctx
->llm
->payload
, events
,
2944 sizeof(struct lttng_event
) * nb_events
);
2951 case LTTNG_START_TRACE
:
2953 ret
= cmd_start_trace(cmd_ctx
->session
);
2956 case LTTNG_STOP_TRACE
:
2958 ret
= cmd_stop_trace(cmd_ctx
->session
);
2961 case LTTNG_CREATE_SESSION
:
2963 ret
= cmd_create_session(cmd_ctx
->lsm
->session
.name
,
2964 cmd_ctx
->lsm
->session
.path
);
2967 case LTTNG_DESTROY_SESSION
:
2969 ret
= cmd_destroy_session(cmd_ctx
->session
,
2970 cmd_ctx
->lsm
->session
.name
);
2973 case LTTNG_LIST_DOMAINS
:
2976 struct lttng_domain
*domains
;
2978 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
2984 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
2989 /* Copy event list into message payload */
2990 memcpy(cmd_ctx
->llm
->payload
, domains
,
2991 nb_dom
* sizeof(struct lttng_domain
));
2998 case LTTNG_LIST_CHANNELS
:
3001 struct lttng_channel
*channels
;
3003 nb_chan
= cmd_list_channels(cmd_ctx
->session
, &channels
);
3009 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3014 /* Copy event list into message payload */
3015 memcpy(cmd_ctx
->llm
->payload
, channels
,
3016 nb_chan
* sizeof(struct lttng_channel
));
3023 case LTTNG_LIST_EVENTS
:
3026 struct lttng_event
*events
= NULL
;
3028 nb_event
= cmd_list_events(cmd_ctx
->session
,
3029 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3035 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3040 /* Copy event list into message payload */
3041 memcpy(cmd_ctx
->llm
->payload
, events
,
3042 nb_event
* sizeof(struct lttng_event
));
3049 case LTTNG_LIST_SESSIONS
:
3051 session_lock_list();
3053 if (session_list_ptr
->count
== 0) {
3054 ret
= LTTCOMM_NO_SESSION
;
3055 session_unlock_list();
3059 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) *
3060 session_list_ptr
->count
);
3062 session_unlock_list();
3066 /* Filled the session array */
3067 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
));
3069 session_unlock_list();
3074 case LTTNG_CALIBRATE
:
3076 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3077 &cmd_ctx
->lsm
->u
.calibrate
);
3080 case LTTNG_REGISTER_CONSUMER
:
3082 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3083 cmd_ctx
->lsm
->u
.reg
.path
);
3092 if (cmd_ctx
->llm
== NULL
) {
3093 DBG("Missing llm structure. Allocating one.");
3094 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3098 /* Set return code */
3099 cmd_ctx
->llm
->ret_code
= ret
;
3101 if (cmd_ctx
->session
) {
3102 session_unlock(cmd_ctx
->session
);
3109 * This thread manage all clients request using the unix client socket for
3112 static void *thread_manage_clients(void *data
)
3114 int sock
= 0, ret
, i
, pollfd
;
3115 uint32_t revents
, nb_fd
;
3116 struct command_ctx
*cmd_ctx
= NULL
;
3117 struct lttng_poll_event events
;
3119 DBG("[thread] Manage client started");
3121 rcu_register_thread();
3123 ret
= lttcomm_listen_unix_sock(client_sock
);
3129 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3130 * more will be added to this poll set.
3132 ret
= create_thread_poll_set(&events
, 2);
3137 /* Add the application registration socket */
3138 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3144 * Notify parent pid that we are ready to accept command for client side.
3146 if (opt_sig_parent
) {
3147 kill(ppid
, SIGCHLD
);
3151 DBG("Accepting client command ...");
3153 nb_fd
= LTTNG_POLL_GETNB(&events
);
3155 /* Inifinite blocking call, waiting for transmission */
3156 ret
= lttng_poll_wait(&events
, -1);
3161 for (i
= 0; i
< nb_fd
; i
++) {
3162 /* Fetch once the poll data */
3163 revents
= LTTNG_POLL_GETEV(&events
, i
);
3164 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3166 /* Thread quit pipe has been closed. Killing thread. */
3167 ret
= check_thread_quit_pipe(pollfd
, revents
);
3172 /* Event on the registration socket */
3173 if (pollfd
== client_sock
) {
3174 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3175 ERR("Client socket poll error");
3181 DBG("Wait for client response");
3183 sock
= lttcomm_accept_unix_sock(client_sock
);
3188 /* Allocate context command to process the client request */
3189 cmd_ctx
= malloc(sizeof(struct command_ctx
));
3190 if (cmd_ctx
== NULL
) {
3191 perror("malloc cmd_ctx");
3195 /* Allocate data buffer for reception */
3196 cmd_ctx
->lsm
= malloc(sizeof(struct lttcomm_session_msg
));
3197 if (cmd_ctx
->lsm
== NULL
) {
3198 perror("malloc cmd_ctx->lsm");
3202 cmd_ctx
->llm
= NULL
;
3203 cmd_ctx
->session
= NULL
;
3206 * Data is received from the lttng client. The struct
3207 * lttcomm_session_msg (lsm) contains the command and data request of
3210 DBG("Receiving data from client ...");
3211 ret
= lttcomm_recv_unix_sock(sock
, cmd_ctx
->lsm
,
3212 sizeof(struct lttcomm_session_msg
));
3214 DBG("Nothing recv() from client... continuing");
3220 // TODO: Validate cmd_ctx including sanity check for
3221 // security purpose.
3223 rcu_thread_online();
3225 * This function dispatch the work to the kernel or userspace tracer
3226 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3227 * informations for the client. The command context struct contains
3228 * everything this function may needs.
3230 ret
= process_client_msg(cmd_ctx
);
3231 rcu_thread_offline();
3234 * TODO: Inform client somehow of the fatal error. At
3235 * this point, ret < 0 means that a malloc failed
3236 * (ENOMEM). Error detected but still accept command.
3238 clean_command_ctx(&cmd_ctx
);
3242 DBG("Sending response (size: %d, retcode: %s)",
3243 cmd_ctx
->lttng_msg_size
,
3244 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3245 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3247 ERR("Failed to send data back to client");
3250 clean_command_ctx(&cmd_ctx
);
3252 /* End of transmission */
3257 DBG("Client thread dying");
3258 unlink(client_unix_sock_path
);
3262 lttng_poll_clean(&events
);
3263 clean_command_ctx(&cmd_ctx
);
3265 rcu_unregister_thread();
3271 * usage function on stderr
3273 static void usage(void)
3275 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3276 fprintf(stderr
, " -h, --help Display this usage.\n");
3277 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3278 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3279 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3280 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3281 fprintf(stderr
, " --ustconsumerd-err-sock PATH Specify path for the UST consumer error socket\n");
3282 fprintf(stderr
, " --ustconsumerd-cmd-sock PATH Specify path for the UST consumer command socket\n");
3283 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3284 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3285 fprintf(stderr
, " -V, --version Show version number.\n");
3286 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3287 fprintf(stderr
, " -q, --quiet No output at all.\n");
3288 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3289 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3293 * daemon argument parsing
3295 static int parse_args(int argc
, char **argv
)
3299 static struct option long_options
[] = {
3300 { "client-sock", 1, 0, 'c' },
3301 { "apps-sock", 1, 0, 'a' },
3302 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3303 { "kconsumerd-err-sock", 1, 0, 'E' },
3304 { "ustconsumerd-cmd-sock", 1, 0, 'D' },
3305 { "ustconsumerd-err-sock", 1, 0, 'F' },
3306 { "daemonize", 0, 0, 'd' },
3307 { "sig-parent", 0, 0, 'S' },
3308 { "help", 0, 0, 'h' },
3309 { "group", 1, 0, 'g' },
3310 { "version", 0, 0, 'V' },
3311 { "quiet", 0, 0, 'q' },
3312 { "verbose", 0, 0, 'v' },
3313 { "verbose-consumer", 0, 0, 'Z' },
3318 int option_index
= 0;
3319 c
= getopt_long(argc
, argv
, "dhqvVS" "a:c:g:s:C:E:D:F:Z",
3320 long_options
, &option_index
);
3327 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3329 fprintf(stderr
, " with arg %s\n", optarg
);
3333 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3336 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3342 opt_tracing_group
= strdup(optarg
);
3348 fprintf(stdout
, "%s\n", VERSION
);
3354 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3357 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3360 snprintf(ustconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3363 snprintf(ustconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3369 /* Verbose level can increase using multiple -v */
3373 opt_verbose_consumer
+= 1;
3376 /* Unknown option or other error.
3377 * Error is printed by getopt, just return */
3386 * Creates the two needed socket by the daemon.
3387 * apps_sock - The communication socket for all UST apps.
3388 * client_sock - The communication of the cli tool (lttng).
3390 static int init_daemon_socket(void)
3395 old_umask
= umask(0);
3397 /* Create client tool unix socket */
3398 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
3399 if (client_sock
< 0) {
3400 ERR("Create unix sock failed: %s", client_unix_sock_path
);
3405 /* File permission MUST be 660 */
3406 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3408 ERR("Set file permissions failed: %s", client_unix_sock_path
);
3413 /* Create the application unix socket */
3414 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
3415 if (apps_sock
< 0) {
3416 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
3421 /* File permission MUST be 666 */
3422 ret
= chmod(apps_unix_sock_path
,
3423 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
3425 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
3436 * Check if the global socket is available, and if a daemon is answering at the
3437 * other side. If yes, error is returned.
3439 static int check_existing_daemon(void)
3441 if (access(client_unix_sock_path
, F_OK
) < 0 &&
3442 access(apps_unix_sock_path
, F_OK
) < 0) {
3446 /* Is there anybody out there ? */
3447 if (lttng_session_daemon_alive()) {
3455 * Set the tracing group gid onto the client socket.
3457 * Race window between mkdir and chown is OK because we are going from more
3458 * permissive (root.root) to les permissive (root.tracing).
3460 static int set_permissions(void)
3465 gid
= allowed_group();
3468 WARN("No tracing group detected");
3471 ERR("Missing tracing group. Aborting execution.");
3477 /* Set lttng run dir */
3478 ret
= chown(LTTNG_RUNDIR
, 0, gid
);
3480 ERR("Unable to set group on " LTTNG_RUNDIR
);
3484 /* lttng client socket path */
3485 ret
= chown(client_unix_sock_path
, 0, gid
);
3487 ERR("Unable to set group on %s", client_unix_sock_path
);
3491 /* kconsumer error socket path */
3492 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
3494 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
3498 /* ustconsumer error socket path */
3499 ret
= chown(ustconsumer_data
.err_unix_sock_path
, 0, gid
);
3501 ERR("Unable to set group on %s", ustconsumer_data
.err_unix_sock_path
);
3505 DBG("All permissions are set");
3512 * Create the pipe used to wake up the kernel thread.
3514 static int create_kernel_poll_pipe(void)
3516 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
3520 * Create the application command pipe to wake thread_manage_apps.
3522 static int create_apps_cmd_pipe(void)
3524 return pipe2(apps_cmd_pipe
, O_CLOEXEC
);
3528 * Create the lttng run directory needed for all global sockets and pipe.
3530 static int create_lttng_rundir(void)
3534 ret
= mkdir(LTTNG_RUNDIR
, S_IRWXU
| S_IRWXG
);
3536 if (errno
!= EEXIST
) {
3537 ERR("Unable to create " LTTNG_RUNDIR
);
3549 * Setup sockets and directory needed by the kconsumerd communication with the
3552 static int set_consumer_sockets(struct consumer_data
*consumer_data
)
3555 const char *path
= consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3556 KCONSUMERD_PATH
: USTCONSUMERD_PATH
;
3558 if (strlen(consumer_data
->err_unix_sock_path
) == 0) {
3559 snprintf(consumer_data
->err_unix_sock_path
, PATH_MAX
,
3560 consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3561 KCONSUMERD_ERR_SOCK_PATH
:
3562 USTCONSUMERD_ERR_SOCK_PATH
);
3565 if (strlen(consumer_data
->cmd_unix_sock_path
) == 0) {
3566 snprintf(consumer_data
->cmd_unix_sock_path
, PATH_MAX
,
3567 consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3568 KCONSUMERD_CMD_SOCK_PATH
:
3569 USTCONSUMERD_CMD_SOCK_PATH
);
3572 ret
= mkdir(path
, S_IRWXU
| S_IRWXG
);
3574 if (errno
!= EEXIST
) {
3575 ERR("Failed to create %s", path
);
3581 /* Create the kconsumerd error unix socket */
3582 consumer_data
->err_sock
=
3583 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
3584 if (consumer_data
->err_sock
< 0) {
3585 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
3590 /* File permission MUST be 660 */
3591 ret
= chmod(consumer_data
->err_unix_sock_path
,
3592 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3594 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
3604 * Signal handler for the daemon
3606 * Simply stop all worker threads, leaving main() return gracefully after
3607 * joining all threads and calling cleanup().
3609 static void sighandler(int sig
)
3613 DBG("SIGPIPE catched");
3616 DBG("SIGINT catched");
3620 DBG("SIGTERM catched");
3629 * Setup signal handler for :
3630 * SIGINT, SIGTERM, SIGPIPE
3632 static int set_signal_handler(void)
3635 struct sigaction sa
;
3638 if ((ret
= sigemptyset(&sigset
)) < 0) {
3639 perror("sigemptyset");
3643 sa
.sa_handler
= sighandler
;
3644 sa
.sa_mask
= sigset
;
3646 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
3647 perror("sigaction");
3651 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
3652 perror("sigaction");
3656 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
3657 perror("sigaction");
3661 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
3667 * Set open files limit to unlimited. This daemon can open a large number of
3668 * file descriptors in order to consumer multiple kernel traces.
3670 static void set_ulimit(void)
3675 /* The kernel does not allowed an infinite limit for open files */
3676 lim
.rlim_cur
= 65535;
3677 lim
.rlim_max
= 65535;
3679 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
3681 perror("failed to set open files limit");
3688 int main(int argc
, char **argv
)
3692 const char *home_path
;
3694 rcu_register_thread();
3696 /* Create thread quit pipe */
3697 if ((ret
= init_thread_quit_pipe()) < 0) {
3701 /* Parse arguments */
3703 if ((ret
= parse_args(argc
, argv
) < 0)) {
3716 /* Check if daemon is UID = 0 */
3717 is_root
= !getuid();
3720 ret
= create_lttng_rundir();
3725 if (strlen(apps_unix_sock_path
) == 0) {
3726 snprintf(apps_unix_sock_path
, PATH_MAX
,
3727 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
3730 if (strlen(client_unix_sock_path
) == 0) {
3731 snprintf(client_unix_sock_path
, PATH_MAX
,
3732 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
3735 /* Set global SHM for ust */
3736 if (strlen(wait_shm_path
) == 0) {
3737 snprintf(wait_shm_path
, PATH_MAX
,
3738 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
3741 home_path
= get_home_dir();
3742 if (home_path
== NULL
) {
3743 /* TODO: Add --socket PATH option */
3744 ERR("Can't get HOME directory for sockets creation.");
3749 if (strlen(apps_unix_sock_path
) == 0) {
3750 snprintf(apps_unix_sock_path
, PATH_MAX
,
3751 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
3754 /* Set the cli tool unix socket path */
3755 if (strlen(client_unix_sock_path
) == 0) {
3756 snprintf(client_unix_sock_path
, PATH_MAX
,
3757 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
3760 /* Set global SHM for ust */
3761 if (strlen(wait_shm_path
) == 0) {
3762 snprintf(wait_shm_path
, PATH_MAX
,
3763 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
3767 DBG("Client socket path %s", client_unix_sock_path
);
3768 DBG("Application socket path %s", apps_unix_sock_path
);
3771 * See if daemon already exist.
3773 if ((ret
= check_existing_daemon()) < 0) {
3774 ERR("Already running daemon.\n");
3776 * We do not goto exit because we must not cleanup()
3777 * because a daemon is already running.
3782 /* After this point, we can safely call cleanup() with "goto exit" */
3785 * These actions must be executed as root. We do that *after* setting up
3786 * the sockets path because we MUST make the check for another daemon using
3787 * those paths *before* trying to set the kernel consumer sockets and init
3791 ret
= set_consumer_sockets(&kconsumer_data
);
3796 ret
= set_consumer_sockets(&ustconsumer_data
);
3800 /* Setup kernel tracer */
3801 init_kernel_tracer();
3803 /* Set ulimit for open files */
3807 if ((ret
= set_signal_handler()) < 0) {
3811 /* Setup the needed unix socket */
3812 if ((ret
= init_daemon_socket()) < 0) {
3816 /* Set credentials to socket */
3817 if (is_root
&& ((ret
= set_permissions()) < 0)) {
3821 /* Get parent pid if -S, --sig-parent is specified. */
3822 if (opt_sig_parent
) {
3826 /* Setup the kernel pipe for waking up the kernel thread */
3827 if ((ret
= create_kernel_poll_pipe()) < 0) {
3831 /* Setup the thread apps communication pipe. */
3832 if ((ret
= create_apps_cmd_pipe()) < 0) {
3836 /* Init UST command queue. */
3837 cds_wfq_init(&ust_cmd_queue
.queue
);
3839 /* Init UST app hash table */
3843 * Get session list pointer. This pointer MUST NOT be free(). This list is
3844 * statically declared in session.c
3846 session_list_ptr
= session_get_list();
3848 /* Set up max poll set size */
3849 lttng_poll_set_max_size();
3851 /* Create thread to manage the client socket */
3852 ret
= pthread_create(&client_thread
, NULL
,
3853 thread_manage_clients
, (void *) NULL
);
3855 perror("pthread_create clients");
3859 /* Create thread to dispatch registration */
3860 ret
= pthread_create(&dispatch_thread
, NULL
,
3861 thread_dispatch_ust_registration
, (void *) NULL
);
3863 perror("pthread_create dispatch");
3867 /* Create thread to manage application registration. */
3868 ret
= pthread_create(®_apps_thread
, NULL
,
3869 thread_registration_apps
, (void *) NULL
);
3871 perror("pthread_create registration");
3875 /* Create thread to manage application socket */
3876 ret
= pthread_create(&apps_thread
, NULL
,
3877 thread_manage_apps
, (void *) NULL
);
3879 perror("pthread_create apps");
3883 /* Create kernel thread to manage kernel event */
3884 ret
= pthread_create(&kernel_thread
, NULL
,
3885 thread_manage_kernel
, (void *) NULL
);
3887 perror("pthread_create kernel");
3891 ret
= pthread_join(kernel_thread
, &status
);
3893 perror("pthread_join");
3894 goto error
; /* join error, exit without cleanup */
3898 ret
= pthread_join(apps_thread
, &status
);
3900 perror("pthread_join");
3901 goto error
; /* join error, exit without cleanup */
3905 ret
= pthread_join(reg_apps_thread
, &status
);
3907 perror("pthread_join");
3908 goto error
; /* join error, exit without cleanup */
3912 ret
= pthread_join(dispatch_thread
, &status
);
3914 perror("pthread_join");
3915 goto error
; /* join error, exit without cleanup */
3919 ret
= pthread_join(client_thread
, &status
);
3921 perror("pthread_join");
3922 goto error
; /* join error, exit without cleanup */
3925 ret
= join_consumer_thread(&kconsumer_data
);
3927 perror("join_consumer");
3928 goto error
; /* join error, exit without cleanup */
3934 * cleanup() is called when no other thread is running.
3936 rcu_thread_online();
3938 rcu_thread_offline();
3939 rcu_unregister_thread();