2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Copyright (C) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; only version 2
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 #include <semaphore.h>
32 #include <sys/mount.h>
33 #include <sys/resource.h>
34 #include <sys/socket.h>
36 #include <sys/types.h>
39 #include <ltt-kconsumerd.h>
40 #include <lttng-sessiond-comm.h>
41 #include <lttng/lttng-kconsumerd.h>
45 #include "kernel-ctl.h"
46 #include "ltt-sessiond.h"
47 #include "traceable-app.h"
52 const char default_home_dir
[] = DEFAULT_HOME_DIR
;
53 const char default_tracing_group
[] = LTTNG_DEFAULT_TRACING_GROUP
;
54 const char default_ust_sock_dir
[] = DEFAULT_UST_SOCK_DIR
;
55 const char default_global_apps_pipe
[] = DEFAULT_GLOBAL_APPS_PIPE
;
58 int opt_verbose
; /* Not static for lttngerr.h */
59 int opt_verbose_kconsumerd
; /* Not static for lttngerr.h */
60 int opt_quiet
; /* Not static for lttngerr.h */
63 const char *opt_tracing_group
;
64 static int opt_sig_parent
;
65 static int opt_daemon
;
66 static int is_root
; /* Set to 1 if the daemon is running as root */
67 static pid_t ppid
; /* Parent PID for --sig-parent option */
68 static pid_t kconsumerd_pid
;
69 static struct pollfd
*kernel_pollfd
;
71 static char apps_unix_sock_path
[PATH_MAX
]; /* Global application Unix socket path */
72 static char client_unix_sock_path
[PATH_MAX
]; /* Global client Unix socket path */
73 static char kconsumerd_err_unix_sock_path
[PATH_MAX
]; /* kconsumerd error Unix socket path */
74 static char kconsumerd_cmd_unix_sock_path
[PATH_MAX
]; /* kconsumerd command Unix socket path */
77 static int client_sock
;
79 static int kconsumerd_err_sock
;
80 static int kconsumerd_cmd_sock
;
81 static int kernel_tracer_fd
;
82 static int kernel_poll_pipe
[2];
85 * Quit pipe for all threads. This permits a single cancellation point
86 * for all threads when receiving an event on the pipe.
88 static int thread_quit_pipe
[2];
90 /* Pthread, Mutexes and Semaphores */
91 static pthread_t kconsumerd_thread
;
92 static pthread_t apps_thread
;
93 static pthread_t client_thread
;
94 static pthread_t kernel_thread
;
95 static sem_t kconsumerd_sem
;
97 static pthread_mutex_t kconsumerd_pid_mutex
; /* Mutex to control kconsumerd pid assignation */
99 static int modprobe_remove_kernel_modules(void);
102 * Pointer initialized before thread creation.
104 * This points to the tracing session list containing the session count and a
105 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
106 * MUST NOT be taken if you call a public function in session.c.
108 * The lock is nested inside the structure: session_list_ptr->lock. Please use
109 * lock_session_list and unlock_session_list for lock acquisition.
111 static struct ltt_session_list
*session_list_ptr
;
113 static gid_t
allowed_group(void)
117 if (opt_tracing_group
) {
118 grp
= getgrnam(opt_tracing_group
);
120 grp
= getgrnam(default_tracing_group
);
132 * Return -1 on error or 0 if all pipes are created.
134 static int init_thread_quit_pipe(void)
138 ret
= pipe2(thread_quit_pipe
, O_CLOEXEC
);
140 perror("thread quit pipe");
149 * Complete teardown of a kernel session. This free all data structure related
150 * to a kernel session and update counter.
152 static void teardown_kernel_session(struct ltt_session
*session
)
154 if (session
->kernel_session
!= NULL
) {
155 DBG("Tearing down kernel session");
158 * If a custom kernel consumer was registered, close the socket before
159 * tearing down the complete kernel session structure
161 if (session
->kernel_session
->consumer_fd
!= kconsumerd_cmd_sock
) {
162 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
165 trace_destroy_kernel_session(session
->kernel_session
);
166 /* Extra precaution */
167 session
->kernel_session
= NULL
;
171 static void stop_threads(void)
173 /* Stopping all threads */
174 DBG("Terminating all threads");
175 close(thread_quit_pipe
[0]);
176 close(thread_quit_pipe
[1]);
182 static void cleanup(void)
186 struct ltt_session
*sess
, *stmp
;
191 MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm"
192 "Matthew, BEET driven development works!%c[%dm",
193 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
196 DBG("Removing %s directory", LTTNG_RUNDIR
);
197 ret
= asprintf(&cmd
, "rm -rf " LTTNG_RUNDIR
);
199 ERR("asprintf failed. Something is really wrong!");
202 /* Remove lttng run directory */
205 ERR("Unable to clean " LTTNG_RUNDIR
);
208 DBG("Cleaning up all session");
210 /* Destroy session list mutex */
211 if (session_list_ptr
!= NULL
) {
212 pthread_mutex_destroy(&session_list_ptr
->lock
);
214 /* Cleanup ALL session */
215 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
216 teardown_kernel_session(sess
);
217 // TODO complete session cleanup (including UST)
221 pthread_mutex_destroy(&kconsumerd_pid_mutex
);
223 DBG("Closing kernel fd");
224 close(kernel_tracer_fd
);
226 DBG("Unloading kernel modules");
227 modprobe_remove_kernel_modules();
231 * Send data on a unix socket using the liblttsessiondcomm API.
233 * Return lttcomm error code.
235 static int send_unix_sock(int sock
, void *buf
, size_t len
)
237 /* Check valid length */
242 return lttcomm_send_unix_sock(sock
, buf
, len
);
246 * Free memory of a command context structure.
248 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
250 DBG("Clean command context structure");
252 if ((*cmd_ctx
)->llm
) {
253 free((*cmd_ctx
)->llm
);
255 if ((*cmd_ctx
)->lsm
) {
256 free((*cmd_ctx
)->lsm
);
264 * Send all stream fds of kernel channel to the consumer.
266 static int send_kconsumerd_channel_fds(int sock
, struct ltt_kernel_channel
*channel
)
270 struct ltt_kernel_stream
*stream
;
271 struct lttcomm_kconsumerd_header lkh
;
272 struct lttcomm_kconsumerd_msg lkm
;
274 DBG("Sending fds of channel %s to kernel consumer", channel
->channel
->name
);
276 nb_fd
= channel
->stream_count
;
279 lkh
.payload_size
= nb_fd
* sizeof(struct lttcomm_kconsumerd_msg
);
280 lkh
.cmd_type
= ADD_STREAM
;
282 DBG("Sending kconsumerd header");
284 ret
= lttcomm_send_unix_sock(sock
, &lkh
, sizeof(struct lttcomm_kconsumerd_header
));
286 perror("send kconsumerd header");
290 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
291 if (stream
->fd
!= 0) {
293 lkm
.state
= stream
->state
;
294 lkm
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
295 lkm
.output
= channel
->channel
->attr
.output
;
296 strncpy(lkm
.path_name
, stream
->pathname
, PATH_MAX
);
297 lkm
.path_name
[PATH_MAX
- 1] = '\0';
299 DBG("Sending fd %d to kconsumerd", lkm
.fd
);
301 ret
= lttcomm_send_fds_unix_sock(sock
, &lkm
, &lkm
.fd
, 1, sizeof(lkm
));
303 perror("send kconsumerd fd");
309 DBG("Kconsumerd channel fds sent");
318 * Send all stream fds of the kernel session to the consumer.
320 static int send_kconsumerd_fds(struct ltt_kernel_session
*session
)
323 struct ltt_kernel_channel
*chan
;
324 struct lttcomm_kconsumerd_header lkh
;
325 struct lttcomm_kconsumerd_msg lkm
;
328 lkh
.payload_size
= sizeof(struct lttcomm_kconsumerd_msg
);
329 lkh
.cmd_type
= ADD_STREAM
;
331 DBG("Sending kconsumerd header for metadata");
333 ret
= lttcomm_send_unix_sock(session
->consumer_fd
, &lkh
, sizeof(struct lttcomm_kconsumerd_header
));
335 perror("send kconsumerd header");
339 DBG("Sending metadata stream fd");
341 /* Extra protection. It's NOT suppose to be set to 0 at this point */
342 if (session
->consumer_fd
== 0) {
343 session
->consumer_fd
= kconsumerd_cmd_sock
;
346 if (session
->metadata_stream_fd
!= 0) {
347 /* Send metadata stream fd first */
348 lkm
.fd
= session
->metadata_stream_fd
;
349 lkm
.state
= ACTIVE_FD
;
350 lkm
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
351 lkm
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
352 strncpy(lkm
.path_name
, session
->metadata
->pathname
, PATH_MAX
);
353 lkm
.path_name
[PATH_MAX
- 1] = '\0';
355 ret
= lttcomm_send_fds_unix_sock(session
->consumer_fd
, &lkm
, &lkm
.fd
, 1, sizeof(lkm
));
357 perror("send kconsumerd fd");
362 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
363 ret
= send_kconsumerd_channel_fds(session
->consumer_fd
, chan
);
369 DBG("Kconsumerd fds (metadata and channel streams) sent");
379 * Return a socket connected to the libust communication socket of the
380 * application identified by the pid.
382 * If the pid is not found in the traceable list, return -1 to indicate error.
384 static int ust_connect_app(pid_t pid
)
387 struct ltt_traceable_app
*lta
;
389 DBG("Connect to application pid %d", pid
);
391 lta
= find_app_by_pid(pid
);
394 DBG("Application pid %d not found", pid
);
398 sock
= ustctl_connect_pid(lta
->pid
);
400 ERR("Fail connecting to the PID %d", pid
);
405 #endif /* DISABLED */
408 * Notify apps by writing 42 to a named pipe using name. Every applications
409 * waiting for a ltt-sessiond will be notified and re-register automatically to
410 * the session daemon.
412 * Return open or write error value.
414 static int notify_apps(const char *name
)
419 DBG("Notify the global application pipe");
421 /* Try opening the global pipe */
422 fd
= open(name
, O_WRONLY
);
427 /* Notify by writing on the pipe */
428 ret
= write(fd
, "42", 2);
438 * Setup the outgoing data buffer for the response (llm) by allocating the
439 * right amount of memory and copying the original information from the lsm
442 * Return total size of the buffer pointed by buf.
444 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
450 cmd_ctx
->llm
= malloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
451 if (cmd_ctx
->llm
== NULL
) {
457 /* Copy common data */
458 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
459 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
461 cmd_ctx
->llm
->data_size
= size
;
462 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
471 * Update the kernel pollfd set of all channel fd available over all tracing
472 * session. Add the wakeup pipe at the end of the set.
474 static int update_kernel_pollfd(void)
478 * The wakup pipe and the quit pipe are needed so the number of fds starts
479 * at 2 for those pipes.
481 unsigned int nb_fd
= 2;
482 struct ltt_session
*session
;
483 struct ltt_kernel_channel
*channel
;
485 DBG("Updating kernel_pollfd");
487 /* Get the number of channel of all kernel session */
489 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
490 lock_session(session
);
491 if (session
->kernel_session
== NULL
) {
492 unlock_session(session
);
495 nb_fd
+= session
->kernel_session
->channel_count
;
496 unlock_session(session
);
499 DBG("Resizing kernel_pollfd to size %d", nb_fd
);
501 kernel_pollfd
= realloc(kernel_pollfd
, nb_fd
* sizeof(struct pollfd
));
502 if (kernel_pollfd
== NULL
) {
503 perror("malloc kernel_pollfd");
507 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
508 lock_session(session
);
509 if (session
->kernel_session
== NULL
) {
510 unlock_session(session
);
514 ERR("To much channel for kernel_pollfd size");
515 unlock_session(session
);
518 cds_list_for_each_entry(channel
, &session
->kernel_session
->channel_list
.head
, list
) {
519 kernel_pollfd
[i
].fd
= channel
->fd
;
520 kernel_pollfd
[i
].events
= POLLIN
| POLLRDNORM
;
523 unlock_session(session
);
525 unlock_session_list();
527 /* Adding wake up pipe */
528 kernel_pollfd
[nb_fd
- 2].fd
= kernel_poll_pipe
[0];
529 kernel_pollfd
[nb_fd
- 2].events
= POLLIN
;
531 /* Adding the quit pipe */
532 kernel_pollfd
[nb_fd
- 1].fd
= thread_quit_pipe
[0];
537 unlock_session_list();
542 * Find the channel fd from 'fd' over all tracing session. When found, check
543 * for new channel stream and send those stream fds to the kernel consumer.
545 * Useful for CPU hotplug feature.
547 static int update_kernel_stream(int fd
)
550 struct ltt_session
*session
;
551 struct ltt_kernel_channel
*channel
;
553 DBG("Updating kernel streams for channel fd %d", fd
);
556 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
557 lock_session(session
);
558 if (session
->kernel_session
== NULL
) {
559 unlock_session(session
);
563 /* This is not suppose to be 0 but this is an extra security check */
564 if (session
->kernel_session
->consumer_fd
== 0) {
565 session
->kernel_session
->consumer_fd
= kconsumerd_cmd_sock
;
568 cds_list_for_each_entry(channel
, &session
->kernel_session
->channel_list
.head
, list
) {
569 if (channel
->fd
== fd
) {
570 DBG("Channel found, updating kernel streams");
571 ret
= kernel_open_channel_stream(channel
);
577 * Have we already sent fds to the consumer? If yes, it means that
578 * tracing is started so it is safe to send our updated stream fds.
580 if (session
->kernel_session
->kconsumer_fds_sent
== 1) {
581 ret
= send_kconsumerd_channel_fds(session
->kernel_session
->consumer_fd
,
590 unlock_session(session
);
594 unlock_session_list();
596 unlock_session(session
);
602 * This thread manage event coming from the kernel.
604 * Features supported in this thread:
607 static void *thread_manage_kernel(void *data
)
609 int ret
, i
, nb_fd
= 0;
611 int update_poll_flag
= 1;
613 DBG("Thread manage kernel started");
616 if (update_poll_flag
== 1) {
617 nb_fd
= update_kernel_pollfd();
621 update_poll_flag
= 0;
624 DBG("Polling on %d fds", nb_fd
);
626 /* Poll infinite value of time */
627 ret
= poll(kernel_pollfd
, nb_fd
, -1);
629 perror("poll kernel thread");
631 } else if (ret
== 0) {
632 /* Should not happen since timeout is infinite */
636 /* Thread quit pipe has been closed. Killing thread. */
637 if (kernel_pollfd
[nb_fd
- 1].revents
== POLLNVAL
) {
641 DBG("Kernel poll event triggered");
644 * Check if the wake up pipe was triggered. If so, the kernel_pollfd
647 switch (kernel_pollfd
[nb_fd
- 2].revents
) {
649 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
650 update_poll_flag
= 1;
658 for (i
= 0; i
< nb_fd
; i
++) {
659 switch (kernel_pollfd
[i
].revents
) {
661 * New CPU detected by the kernel. Adding kernel stream to kernel
662 * session and updating the kernel consumer
664 case POLLIN
| POLLRDNORM
:
665 ret
= update_kernel_stream(kernel_pollfd
[i
].fd
);
675 DBG("Kernel thread dying");
680 close(kernel_poll_pipe
[0]);
681 close(kernel_poll_pipe
[1]);
686 * This thread manage the kconsumerd error sent back to the session daemon.
688 static void *thread_manage_kconsumerd(void *data
)
691 enum lttcomm_return_code code
;
692 struct pollfd pollfd
[2];
694 DBG("[thread] Manage kconsumerd started");
696 ret
= lttcomm_listen_unix_sock(kconsumerd_err_sock
);
701 /* First fd is always the quit pipe */
702 pollfd
[0].fd
= thread_quit_pipe
[0];
705 pollfd
[1].fd
= kconsumerd_err_sock
;
706 pollfd
[1].events
= POLLIN
;
708 /* Inifinite blocking call, waiting for transmission */
709 ret
= poll(pollfd
, 2, -1);
711 perror("poll kconsumerd thread");
715 /* Thread quit pipe has been closed. Killing thread. */
716 if (pollfd
[0].revents
== POLLNVAL
) {
718 } else if (pollfd
[1].revents
== POLLERR
) {
719 ERR("Kconsumerd err socket poll error");
723 sock
= lttcomm_accept_unix_sock(kconsumerd_err_sock
);
728 /* Getting status code from kconsumerd */
729 ret
= lttcomm_recv_unix_sock(sock
, &code
, sizeof(enum lttcomm_return_code
));
734 if (code
== KCONSUMERD_COMMAND_SOCK_READY
) {
735 kconsumerd_cmd_sock
= lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path
);
736 if (kconsumerd_cmd_sock
< 0) {
737 sem_post(&kconsumerd_sem
);
738 perror("kconsumerd connect");
741 /* Signal condition to tell that the kconsumerd is ready */
742 sem_post(&kconsumerd_sem
);
743 DBG("Kconsumerd command socket ready");
745 DBG("Kconsumerd error when waiting for SOCK_READY : %s",
746 lttcomm_get_readable_code(-code
));
750 /* Kconsumerd err socket */
752 pollfd
[1].events
= POLLIN
;
754 /* Inifinite blocking call, waiting for transmission */
755 ret
= poll(pollfd
, 2, -1);
757 perror("poll kconsumerd thread");
761 /* Thread quit pipe has been closed. Killing thread. */
762 if (pollfd
[0].revents
== POLLNVAL
) {
764 } else if (pollfd
[1].revents
== POLLERR
) {
765 ERR("Kconsumerd err socket second poll error");
769 /* Wait for any kconsumerd error */
770 ret
= lttcomm_recv_unix_sock(sock
, &code
, sizeof(enum lttcomm_return_code
));
772 ERR("Kconsumerd closed the command socket");
776 ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code
));
779 DBG("Kconsumerd thread dying");
780 if (kconsumerd_err_sock
) {
781 close(kconsumerd_err_sock
);
783 if (kconsumerd_cmd_sock
) {
784 close(kconsumerd_cmd_sock
);
790 unlink(kconsumerd_err_unix_sock_path
);
791 unlink(kconsumerd_cmd_unix_sock_path
);
798 * This thread manage the application socket communication
800 static void *thread_manage_apps(void *data
)
803 struct pollfd pollfd
[2];
805 /* TODO: Something more elegant is needed but fine for now */
806 /* FIXME: change all types to either uint8_t, uint32_t, uint64_t
807 * for 32-bit vs 64-bit compat processes. */
808 /* replicate in ust with version number */
810 int reg
; /* 1:register, 0:unregister */
815 DBG("[thread] Manage apps started");
817 ret
= lttcomm_listen_unix_sock(apps_sock
);
822 /* First fd is always the quit pipe */
823 pollfd
[0].fd
= thread_quit_pipe
[0];
826 pollfd
[1].fd
= apps_sock
;
827 pollfd
[1].events
= POLLIN
;
829 /* Notify all applications to register */
830 notify_apps(default_global_apps_pipe
);
833 DBG("Accepting application registration");
835 /* Inifinite blocking call, waiting for transmission */
836 ret
= poll(pollfd
, 2, -1);
838 perror("poll apps thread");
842 /* Thread quit pipe has been closed. Killing thread. */
843 if (pollfd
[0].revents
== POLLNVAL
) {
845 } else if (pollfd
[1].revents
== POLLERR
) {
846 ERR("Apps socket poll error");
850 sock
= lttcomm_accept_unix_sock(apps_sock
);
856 * Using message-based transmissions to ensure we don't
857 * have to deal with partially received messages.
859 ret
= lttcomm_recv_unix_sock(sock
, ®_msg
, sizeof(reg_msg
));
865 /* Add application to the global traceable list */
866 if (reg_msg
.reg
== 1) {
869 * TODO: socket should be either passed to a
870 * listener thread (for more messages) or
871 * closed. It currently leaks.
873 ret
= register_traceable_app(reg_msg
.pid
, reg_msg
.uid
);
875 /* register_traceable_app only return an error with
876 * ENOMEM. At this point, we better stop everything.
882 unregister_traceable_app(reg_msg
.pid
);
887 DBG("Apps thread dying");
895 unlink(apps_unix_sock_path
);
900 * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
901 * exec or it will fails.
903 static int spawn_kconsumerd_thread(void)
907 /* Setup semaphore */
908 sem_init(&kconsumerd_sem
, 0, 0);
910 ret
= pthread_create(&kconsumerd_thread
, NULL
, thread_manage_kconsumerd
, (void *) NULL
);
912 perror("pthread_create kconsumerd");
916 /* Wait for the kconsumerd thread to be ready */
917 sem_wait(&kconsumerd_sem
);
919 if (kconsumerd_pid
== 0) {
920 ERR("Kconsumerd did not start");
927 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
932 * Join kernel consumer thread
934 static int join_kconsumerd_thread(void)
939 if (kconsumerd_pid
!= 0) {
940 ret
= kill(kconsumerd_pid
, SIGTERM
);
942 ERR("Error killing kconsumerd");
945 return pthread_join(kconsumerd_thread
, &status
);
952 * Fork and exec a kernel consumer daemon (kconsumerd).
954 * Return pid if successful else -1.
956 static pid_t
spawn_kconsumerd(void)
960 const char *verbosity
;
962 DBG("Spawning kconsumerd");
969 if (opt_verbose
> 1 || opt_verbose_kconsumerd
) {
970 verbosity
= "--verbose";
972 verbosity
= "--quiet";
974 execl(INSTALL_BIN_PATH
"/ltt-kconsumerd", "ltt-kconsumerd", verbosity
, NULL
);
976 perror("kernel start consumer exec");
979 } else if (pid
> 0) {
983 perror("kernel start consumer fork");
993 * Spawn the kconsumerd daemon and session daemon thread.
995 static int start_kconsumerd(void)
999 pthread_mutex_lock(&kconsumerd_pid_mutex
);
1000 if (kconsumerd_pid
!= 0) {
1001 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
1005 ret
= spawn_kconsumerd();
1007 ERR("Spawning kconsumerd failed");
1008 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1009 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
1013 /* Setting up the global kconsumerd_pid */
1014 kconsumerd_pid
= ret
;
1015 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
1017 DBG("Kconsumerd pid %d", ret
);
1019 DBG("Spawning kconsumerd thread");
1020 ret
= spawn_kconsumerd_thread();
1022 ERR("Fatal error spawning kconsumerd thread");
1034 * modprobe_kernel_modules
1036 static int modprobe_kernel_modules(void)
1041 for (i
= 0; i
< ARRAY_SIZE(kernel_modules_list
); i
++) {
1042 ret
= snprintf(modprobe
, sizeof(modprobe
),
1043 "/sbin/modprobe %s%s",
1044 kernel_modules_list
[i
].required
? "" : "--quiet ",
1045 kernel_modules_list
[i
].name
);
1047 perror("snprintf modprobe");
1050 modprobe
[sizeof(modprobe
) - 1] = '\0';
1051 ret
= system(modprobe
);
1053 ERR("Unable to launch modprobe for module %s",
1054 kernel_modules_list
[i
].name
);
1055 } else if (kernel_modules_list
[i
].required
1056 && WEXITSTATUS(ret
) != 0) {
1057 ERR("Unable to load module %s",
1058 kernel_modules_list
[i
].name
);
1060 DBG("Modprobe successfully %s",
1061 kernel_modules_list
[i
].name
);
1070 * modprobe_remove_kernel_modules
1071 * Remove modules in reverse load order.
1073 static int modprobe_remove_kernel_modules(void)
1078 for (i
= ARRAY_SIZE(kernel_modules_list
) - 1; i
>= 0; i
--) {
1079 ret
= snprintf(modprobe
, sizeof(modprobe
),
1080 "/sbin/modprobe --remove --quiet %s",
1081 kernel_modules_list
[i
].name
);
1083 perror("snprintf modprobe --remove");
1086 modprobe
[sizeof(modprobe
) - 1] = '\0';
1087 ret
= system(modprobe
);
1089 ERR("Unable to launch modprobe --remove for module %s",
1090 kernel_modules_list
[i
].name
);
1091 } else if (kernel_modules_list
[i
].required
1092 && WEXITSTATUS(ret
) != 0) {
1093 ERR("Unable to remove module %s",
1094 kernel_modules_list
[i
].name
);
1096 DBG("Modprobe removal successful %s",
1097 kernel_modules_list
[i
].name
);
1108 static int mount_debugfs(char *path
)
1111 char *type
= "debugfs";
1113 ret
= mkdir_recursive(path
, S_IRWXU
| S_IRWXG
, geteuid(), getegid());
1118 ret
= mount(type
, path
, type
, 0, NULL
);
1120 perror("mount debugfs");
1124 DBG("Mounted debugfs successfully at %s", path
);
1131 * Setup necessary data for kernel tracer action.
1133 static void init_kernel_tracer(void)
1136 char *proc_mounts
= "/proc/mounts";
1138 char *debugfs_path
= NULL
, *lttng_path
;
1141 /* Detect debugfs */
1142 fp
= fopen(proc_mounts
, "r");
1144 ERR("Unable to probe %s", proc_mounts
);
1148 while (fgets(line
, sizeof(line
), fp
) != NULL
) {
1149 if (strstr(line
, "debugfs") != NULL
) {
1150 /* Remove first string */
1152 /* Dup string here so we can reuse line later on */
1153 debugfs_path
= strdup(strtok(NULL
, " "));
1154 DBG("Got debugfs path : %s", debugfs_path
);
1161 /* Mount debugfs if needded */
1162 if (debugfs_path
== NULL
) {
1163 ret
= asprintf(&debugfs_path
, "/mnt/debugfs");
1165 perror("asprintf debugfs path");
1168 ret
= mount_debugfs(debugfs_path
);
1174 /* Modprobe lttng kernel modules */
1175 ret
= modprobe_kernel_modules();
1180 /* Setup lttng kernel path */
1181 ret
= asprintf(<tng_path
, "%s/lttng", debugfs_path
);
1183 perror("asprintf lttng path");
1187 /* Open debugfs lttng */
1188 kernel_tracer_fd
= open(lttng_path
, O_RDWR
);
1189 if (kernel_tracer_fd
< 0) {
1190 DBG("Failed to open %s", lttng_path
);
1196 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1206 WARN("No kernel tracer available");
1207 kernel_tracer_fd
= 0;
1212 * Start tracing by creating trace directory and sending FDs to the kernel
1215 static int start_kernel_trace(struct ltt_kernel_session
*session
)
1219 if (session
->kconsumer_fds_sent
== 0) {
1221 * Assign default kernel consumer if no consumer assigned to the kernel
1222 * session. At this point, it's NOT suppose to be 0 but this is an extra
1225 if (session
->consumer_fd
== 0) {
1226 session
->consumer_fd
= kconsumerd_cmd_sock
;
1229 ret
= send_kconsumerd_fds(session
);
1231 ERR("Send kconsumerd fds failed");
1232 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1236 session
->kconsumer_fds_sent
= 1;
1244 * Notify kernel thread to update it's pollfd.
1246 static int notify_kernel_pollfd(void)
1250 /* Inform kernel thread of the new kernel channel */
1251 ret
= write(kernel_poll_pipe
[1], "!", 1);
1253 perror("write kernel poll pipe");
1260 * Allocate a channel structure and fill it.
1262 static struct lttng_channel
*init_default_channel(enum lttng_domain_type domain_type
,
1265 struct lttng_channel
*chan
;
1267 chan
= malloc(sizeof(struct lttng_channel
));
1269 perror("init channel malloc");
1273 if (snprintf(chan
->name
, NAME_MAX
, "%s", name
) < 0) {
1274 perror("snprintf channel name");
1278 chan
->attr
.overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
1279 chan
->attr
.switch_timer_interval
= DEFAULT_CHANNEL_SWITCH_TIMER
;
1280 chan
->attr
.read_timer_interval
= DEFAULT_CHANNEL_READ_TIMER
;
1282 switch (domain_type
) {
1283 case LTTNG_DOMAIN_KERNEL
:
1284 chan
->attr
.subbuf_size
= DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE
;
1285 chan
->attr
.num_subbuf
= DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
;
1286 chan
->attr
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
1290 goto error
; /* Not implemented */
1301 * Create a kernel tracer session then create the default channel.
1303 static int create_kernel_session(struct ltt_session
*session
)
1307 DBG("Creating kernel session");
1309 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1311 ret
= LTTCOMM_KERN_SESS_FAIL
;
1315 /* Set kernel consumer socket fd */
1316 if (kconsumerd_cmd_sock
) {
1317 session
->kernel_session
->consumer_fd
= kconsumerd_cmd_sock
;
1320 ret
= asprintf(&session
->kernel_session
->trace_path
, "%s/kernel",
1323 perror("asprintf kernel traces path");
1327 ret
= mkdir_recursive(session
->kernel_session
->trace_path
,
1328 S_IRWXU
| S_IRWXG
, geteuid(), allowed_group());
1330 if (ret
!= -EEXIST
) {
1331 ERR("Trace directory creation error");
1341 * Using the session list, filled a lttng_session array to send back to the
1342 * client for session listing.
1344 * The session list lock MUST be acquired before calling this function. Use
1345 * lock_session_list() and unlock_session_list().
1347 static void list_lttng_sessions(struct lttng_session
*sessions
)
1350 struct ltt_session
*session
;
1352 DBG("Getting all available session");
1354 * Iterate over session list and append data after the control struct in
1357 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1358 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
1359 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
1360 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
1361 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
1367 * Fill lttng_channel array of all channels.
1369 static void list_lttng_channels(struct ltt_session
*session
,
1370 struct lttng_channel
*channels
)
1373 struct ltt_kernel_channel
*kchan
;
1375 DBG("Listing channels for session %s", session
->name
);
1377 /* Kernel channels */
1378 if (session
->kernel_session
!= NULL
) {
1379 cds_list_for_each_entry(kchan
, &session
->kernel_session
->channel_list
.head
, list
) {
1380 /* Copy lttng_channel struct to array */
1381 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
1382 channels
[i
].enabled
= kchan
->enabled
;
1387 /* TODO: Missing UST listing */
1391 * Fill lttng_event array of all events in the channel.
1393 static void list_lttng_events(struct ltt_kernel_channel
*kchan
,
1394 struct lttng_event
*events
)
1397 * TODO: This is ONLY kernel. Need UST support.
1400 struct ltt_kernel_event
*event
;
1402 DBG("Listing events for channel %s", kchan
->channel
->name
);
1404 /* Kernel channels */
1405 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
1406 strncpy(events
[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
1407 events
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1408 events
[i
].enabled
= event
->enabled
;
1409 switch (event
->event
->instrumentation
) {
1410 case LTTNG_KERNEL_TRACEPOINT
:
1411 events
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1413 case LTTNG_KERNEL_KPROBE
:
1414 case LTTNG_KERNEL_KRETPROBE
:
1415 events
[i
].type
= LTTNG_EVENT_PROBE
;
1416 memcpy(&events
[i
].attr
.probe
, &event
->event
->u
.kprobe
,
1417 sizeof(struct lttng_kernel_kprobe
));
1419 case LTTNG_KERNEL_FUNCTION
:
1420 events
[i
].type
= LTTNG_EVENT_FUNCTION
;
1421 memcpy(&events
[i
].attr
.ftrace
, &event
->event
->u
.ftrace
,
1422 sizeof(struct lttng_kernel_function
));
1430 * Process the command requested by the lttng client within the command
1431 * context structure. This function make sure that the return structure (llm)
1432 * is set and ready for transmission before returning.
1434 * Return any error encountered or 0 for success.
1436 static int process_client_msg(struct command_ctx
*cmd_ctx
)
1438 int ret
= LTTCOMM_OK
;
1440 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
1443 * Commands that DO NOT need a session.
1445 switch (cmd_ctx
->lsm
->cmd_type
) {
1446 case LTTNG_CREATE_SESSION
:
1447 case LTTNG_LIST_SESSIONS
:
1448 case LTTNG_LIST_TRACEPOINTS
:
1449 case LTTNG_CALIBRATE
:
1452 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
1453 cmd_ctx
->session
= find_session_by_name(cmd_ctx
->lsm
->session
.name
);
1454 if (cmd_ctx
->session
== NULL
) {
1455 /* If session name not found */
1456 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
1457 ret
= LTTCOMM_SESS_NOT_FOUND
;
1458 } else { /* If no session name specified */
1459 ret
= LTTCOMM_SELECT_SESS
;
1463 /* Acquire lock for the session */
1464 lock_session(cmd_ctx
->session
);
1470 * Check domain type for specific "pre-action".
1472 switch (cmd_ctx
->lsm
->domain
.type
) {
1473 case LTTNG_DOMAIN_KERNEL
:
1474 /* Kernel tracer check */
1475 if (kernel_tracer_fd
== 0) {
1476 init_kernel_tracer();
1477 if (kernel_tracer_fd
== 0) {
1478 ret
= LTTCOMM_KERN_NA
;
1483 /* Need a session for kernel command */
1484 switch (cmd_ctx
->lsm
->cmd_type
) {
1485 case LTTNG_CALIBRATE
:
1486 case LTTNG_CREATE_SESSION
:
1487 case LTTNG_LIST_SESSIONS
:
1488 case LTTNG_LIST_TRACEPOINTS
:
1491 if (cmd_ctx
->session
->kernel_session
== NULL
) {
1492 ret
= create_kernel_session(cmd_ctx
->session
);
1494 ret
= LTTCOMM_KERN_SESS_FAIL
;
1498 /* Start the kernel consumer daemon */
1500 if (kconsumerd_pid
== 0 &&
1501 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
1502 ret
= start_kconsumerd();
1514 /* Process by command type */
1515 switch (cmd_ctx
->lsm
->cmd_type
) {
1516 case LTTNG_ADD_CONTEXT
:
1518 struct lttng_kernel_context kctx
;
1520 /* Setup lttng message with no payload */
1521 ret
= setup_lttng_msg(cmd_ctx
, 0);
1526 switch (cmd_ctx
->lsm
->domain
.type
) {
1527 case LTTNG_DOMAIN_KERNEL
:
1528 /* Create Kernel context */
1529 kctx
.ctx
= cmd_ctx
->lsm
->u
.context
.ctx
.ctx
;
1530 kctx
.u
.perf_counter
.type
= cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.type
;
1531 kctx
.u
.perf_counter
.config
= cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.config
;
1532 strncpy(kctx
.u
.perf_counter
.name
,
1533 cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.name
,
1534 LTTNG_SYMBOL_NAME_LEN
);
1535 kctx
.u
.perf_counter
.name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1537 /* Add kernel context to kernel tracer. See context.c */
1538 ret
= add_kernel_context(cmd_ctx
->session
->kernel_session
, &kctx
,
1539 cmd_ctx
->lsm
->u
.context
.event_name
,
1540 cmd_ctx
->lsm
->u
.context
.channel_name
);
1541 if (ret
!= LTTCOMM_OK
) {
1546 /* TODO: Userspace tracing */
1547 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1554 case LTTNG_DISABLE_CHANNEL
:
1556 struct ltt_kernel_channel
*kchan
;
1558 /* Setup lttng message with no payload */
1559 ret
= setup_lttng_msg(cmd_ctx
, 0);
1564 switch (cmd_ctx
->lsm
->domain
.type
) {
1565 case LTTNG_DOMAIN_KERNEL
:
1566 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1567 cmd_ctx
->session
->kernel_session
);
1568 if (kchan
== NULL
) {
1569 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1571 } else if (kchan
->enabled
== 1) {
1572 ret
= kernel_disable_channel(kchan
);
1574 if (ret
!= EEXIST
) {
1575 ret
= LTTCOMM_KERN_CHAN_DISABLE_FAIL
;
1580 kernel_wait_quiescent(kernel_tracer_fd
);
1583 /* TODO: Userspace tracing */
1584 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1591 case LTTNG_DISABLE_EVENT
:
1593 struct ltt_kernel_channel
*kchan
;
1594 struct ltt_kernel_event
*kevent
;
1596 /* Setup lttng message with no payload */
1597 ret
= setup_lttng_msg(cmd_ctx
, 0);
1602 switch (cmd_ctx
->lsm
->domain
.type
) {
1603 case LTTNG_DOMAIN_KERNEL
:
1604 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1605 cmd_ctx
->session
->kernel_session
);
1606 if (kchan
== NULL
) {
1607 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1611 kevent
= get_kernel_event_by_name(cmd_ctx
->lsm
->u
.disable
.name
, kchan
);
1612 if (kevent
!= NULL
) {
1613 DBG("Disabling kernel event %s for channel %s.", kevent
->event
->name
,
1614 kchan
->channel
->name
);
1615 ret
= kernel_disable_event(kevent
);
1617 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
1622 kernel_wait_quiescent(kernel_tracer_fd
);
1625 /* TODO: Userspace tracing */
1626 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1633 case LTTNG_DISABLE_ALL_EVENT
:
1635 struct ltt_kernel_channel
*kchan
;
1636 struct ltt_kernel_event
*kevent
;
1638 /* Setup lttng message with no payload */
1639 ret
= setup_lttng_msg(cmd_ctx
, 0);
1644 switch (cmd_ctx
->lsm
->domain
.type
) {
1645 case LTTNG_DOMAIN_KERNEL
:
1646 DBG("Disabling all enabled kernel events");
1647 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1648 cmd_ctx
->session
->kernel_session
);
1649 if (kchan
== NULL
) {
1650 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1654 /* For each event in the kernel session */
1655 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
1656 DBG("Disabling kernel event %s for channel %s.",
1657 kevent
->event
->name
, kchan
->channel
->name
);
1658 ret
= kernel_disable_event(kevent
);
1664 /* Quiescent wait after event disable */
1665 kernel_wait_quiescent(kernel_tracer_fd
);
1668 /* TODO: Userspace tracing */
1669 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1676 case LTTNG_ENABLE_CHANNEL
:
1678 struct ltt_kernel_channel
*kchan
;
1680 /* Setup lttng message with no payload */
1681 ret
= setup_lttng_msg(cmd_ctx
, 0);
1686 switch (cmd_ctx
->lsm
->domain
.type
) {
1687 case LTTNG_DOMAIN_KERNEL
:
1688 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.enable
.channel_name
,
1689 cmd_ctx
->session
->kernel_session
);
1690 if (kchan
== NULL
) {
1691 /* Channel not found, creating it */
1692 DBG("Creating kernel channel");
1694 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1695 &cmd_ctx
->lsm
->u
.channel
.chan
,
1696 cmd_ctx
->session
->kernel_session
->trace_path
);
1698 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1702 /* Notify kernel thread that there is a new channel */
1703 ret
= notify_kernel_pollfd();
1705 ret
= LTTCOMM_FATAL
;
1708 } else if (kchan
->enabled
== 0) {
1709 ret
= kernel_enable_channel(kchan
);
1711 if (ret
!= EEXIST
) {
1712 ret
= LTTCOMM_KERN_CHAN_ENABLE_FAIL
;
1718 kernel_wait_quiescent(kernel_tracer_fd
);
1721 /* TODO: Userspace tracing */
1722 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1729 case LTTNG_ENABLE_EVENT
:
1732 struct ltt_kernel_channel
*kchan
;
1733 struct ltt_kernel_event
*kevent
;
1734 struct lttng_channel
*chan
;
1736 /* Setup lttng message with no payload */
1737 ret
= setup_lttng_msg(cmd_ctx
, 0);
1742 channel_name
= cmd_ctx
->lsm
->u
.enable
.channel_name
;
1744 switch (cmd_ctx
->lsm
->domain
.type
) {
1745 case LTTNG_DOMAIN_KERNEL
:
1746 kchan
= get_kernel_channel_by_name(channel_name
,
1747 cmd_ctx
->session
->kernel_session
);
1748 if (kchan
== NULL
) {
1749 DBG("Channel not found. Creating channel %s", channel_name
);
1751 chan
= init_default_channel(cmd_ctx
->lsm
->domain
.type
, channel_name
);
1753 ret
= LTTCOMM_FATAL
;
1757 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1758 chan
, cmd_ctx
->session
->kernel_session
->trace_path
);
1760 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1763 kchan
= get_kernel_channel_by_name(channel_name
,
1764 cmd_ctx
->session
->kernel_session
);
1765 if (kchan
== NULL
) {
1766 ERR("Channel %s not found after creation. Internal error, giving up.",
1768 ret
= LTTCOMM_FATAL
;
1773 kevent
= get_kernel_event_by_name(cmd_ctx
->lsm
->u
.enable
.event
.name
, kchan
);
1774 if (kevent
== NULL
) {
1775 DBG("Creating kernel event %s for channel %s.",
1776 cmd_ctx
->lsm
->u
.enable
.event
.name
, channel_name
);
1777 ret
= kernel_create_event(&cmd_ctx
->lsm
->u
.enable
.event
, kchan
);
1779 DBG("Enabling kernel event %s for channel %s.",
1780 kevent
->event
->name
, channel_name
);
1781 ret
= kernel_enable_event(kevent
);
1782 if (ret
== -EEXIST
) {
1783 ret
= LTTCOMM_KERN_EVENT_EXIST
;
1789 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
1793 kernel_wait_quiescent(kernel_tracer_fd
);
1796 /* TODO: Userspace tracing */
1797 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1803 case LTTNG_ENABLE_ALL_EVENT
:
1807 struct ltt_kernel_channel
*kchan
;
1808 struct ltt_kernel_event
*kevent
;
1809 struct lttng_event
*event_list
;
1810 struct lttng_channel
*chan
;
1812 /* Setup lttng message with no payload */
1813 ret
= setup_lttng_msg(cmd_ctx
, 0);
1818 DBG("Enabling all kernel event");
1820 channel_name
= cmd_ctx
->lsm
->u
.enable
.channel_name
;
1822 switch (cmd_ctx
->lsm
->domain
.type
) {
1823 case LTTNG_DOMAIN_KERNEL
:
1824 kchan
= get_kernel_channel_by_name(channel_name
,
1825 cmd_ctx
->session
->kernel_session
);
1826 if (kchan
== NULL
) {
1827 DBG("Channel not found. Creating channel %s", channel_name
);
1829 chan
= init_default_channel(cmd_ctx
->lsm
->domain
.type
, channel_name
);
1831 ret
= LTTCOMM_FATAL
;
1835 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1836 chan
, cmd_ctx
->session
->kernel_session
->trace_path
);
1838 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1841 kchan
= get_kernel_channel_by_name(channel_name
,
1842 cmd_ctx
->session
->kernel_session
);
1843 if (kchan
== NULL
) {
1844 ERR("Channel %s not found after creation. Internal error, giving up.",
1846 ret
= LTTCOMM_FATAL
;
1851 /* For each event in the kernel session */
1852 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
1853 DBG("Enabling kernel event %s for channel %s.",
1854 kevent
->event
->name
, channel_name
);
1855 ret
= kernel_enable_event(kevent
);
1861 size
= kernel_list_events(kernel_tracer_fd
, &event_list
);
1863 ret
= LTTCOMM_KERN_LIST_FAIL
;
1867 for (i
= 0; i
< size
; i
++) {
1868 kevent
= get_kernel_event_by_name(event_list
[i
].name
, kchan
);
1869 if (kevent
== NULL
) {
1870 /* Default event type for enable all */
1871 event_list
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1872 /* Enable each single tracepoint event */
1873 ret
= kernel_create_event(&event_list
[i
], kchan
);
1875 /* Ignore error here and continue */
1882 /* Quiescent wait after event enable */
1883 kernel_wait_quiescent(kernel_tracer_fd
);
1886 /* TODO: Userspace tracing */
1887 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1894 case LTTNG_LIST_TRACEPOINTS
:
1896 struct lttng_event
*events
;
1897 ssize_t nb_events
= 0;
1899 switch (cmd_ctx
->lsm
->domain
.type
) {
1900 case LTTNG_DOMAIN_KERNEL
:
1901 DBG("Listing kernel events");
1902 nb_events
= kernel_list_events(kernel_tracer_fd
, &events
);
1903 if (nb_events
< 0) {
1904 ret
= LTTCOMM_KERN_LIST_FAIL
;
1909 /* TODO: Userspace listing */
1910 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1915 * Setup lttng message with payload size set to the event list size in
1916 * bytes and then copy list into the llm payload.
1918 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
1924 /* Copy event list into message payload */
1925 memcpy(cmd_ctx
->llm
->payload
, events
,
1926 sizeof(struct lttng_event
) * nb_events
);
1933 case LTTNG_START_TRACE
:
1935 struct ltt_kernel_channel
*chan
;
1937 /* Setup lttng message with no payload */
1938 ret
= setup_lttng_msg(cmd_ctx
, 0);
1943 /* Kernel tracing */
1944 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
1945 if (cmd_ctx
->session
->kernel_session
->metadata
== NULL
) {
1946 DBG("Open kernel metadata");
1947 ret
= kernel_open_metadata(cmd_ctx
->session
->kernel_session
,
1948 cmd_ctx
->session
->kernel_session
->trace_path
);
1950 ret
= LTTCOMM_KERN_META_FAIL
;
1955 if (cmd_ctx
->session
->kernel_session
->metadata_stream_fd
== 0) {
1956 DBG("Opening kernel metadata stream");
1957 if (cmd_ctx
->session
->kernel_session
->metadata_stream_fd
== 0) {
1958 ret
= kernel_open_metadata_stream(cmd_ctx
->session
->kernel_session
);
1960 ERR("Kernel create metadata stream failed");
1961 ret
= LTTCOMM_KERN_STREAM_FAIL
;
1967 /* For each channel */
1968 cds_list_for_each_entry(chan
,
1969 &cmd_ctx
->session
->kernel_session
->channel_list
.head
, list
) {
1970 if (chan
->stream_count
== 0) {
1971 ret
= kernel_open_channel_stream(chan
);
1973 ERR("Kernel create channel stream failed");
1974 ret
= LTTCOMM_KERN_STREAM_FAIL
;
1977 /* Update the stream global counter */
1978 cmd_ctx
->session
->kernel_session
->stream_count_global
+= ret
;
1982 ret
= start_kernel_trace(cmd_ctx
->session
->kernel_session
);
1984 ret
= LTTCOMM_KERN_START_FAIL
;
1988 DBG("Start kernel tracing");
1989 ret
= kernel_start_session(cmd_ctx
->session
->kernel_session
);
1991 ERR("Kernel start session failed");
1992 ret
= LTTCOMM_KERN_START_FAIL
;
1996 /* Quiescent wait after starting trace */
1997 kernel_wait_quiescent(kernel_tracer_fd
);
2000 /* TODO: Start all UST traces */
2005 case LTTNG_STOP_TRACE
:
2007 struct ltt_kernel_channel
*chan
;
2008 /* Setup lttng message with no payload */
2009 ret
= setup_lttng_msg(cmd_ctx
, 0);
2015 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2016 DBG("Stop kernel tracing");
2018 ret
= kernel_metadata_flush_buffer(cmd_ctx
->session
->kernel_session
->metadata_stream_fd
);
2020 ERR("Kernel metadata flush failed");
2023 cds_list_for_each_entry(chan
, &cmd_ctx
->session
->kernel_session
->channel_list
.head
, list
) {
2024 ret
= kernel_flush_buffer(chan
);
2026 ERR("Kernel flush buffer error");
2030 ret
= kernel_stop_session(cmd_ctx
->session
->kernel_session
);
2032 ERR("Kernel stop session failed");
2033 ret
= LTTCOMM_KERN_STOP_FAIL
;
2037 /* Quiescent wait after stopping trace */
2038 kernel_wait_quiescent(kernel_tracer_fd
);
2041 /* TODO : User-space tracer */
2046 case LTTNG_CREATE_SESSION
:
2048 /* Setup lttng message with no payload */
2049 ret
= setup_lttng_msg(cmd_ctx
, 0);
2054 ret
= create_session(cmd_ctx
->lsm
->session
.name
, cmd_ctx
->lsm
->session
.path
);
2056 if (ret
== -EEXIST
) {
2057 ret
= LTTCOMM_EXIST_SESS
;
2059 ret
= LTTCOMM_FATAL
;
2067 case LTTNG_DESTROY_SESSION
:
2069 /* Setup lttng message with no payload */
2070 ret
= setup_lttng_msg(cmd_ctx
, 0);
2075 /* Clean kernel session teardown */
2076 teardown_kernel_session(cmd_ctx
->session
);
2078 ret
= destroy_session(cmd_ctx
->lsm
->session
.name
);
2080 ret
= LTTCOMM_FATAL
;
2085 * Must notify the kernel thread here to update it's pollfd in order to
2086 * remove the channel(s)' fd just destroyed.
2088 ret
= notify_kernel_pollfd();
2090 ret
= LTTCOMM_FATAL
;
2097 case LTTNG_LIST_DOMAINS
:
2101 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2105 nb_dom
+= cmd_ctx
->session
->ust_trace_count
;
2107 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_domain
) * nb_dom
);
2112 ((struct lttng_domain
*)(cmd_ctx
->llm
->payload
))[0].type
=
2113 LTTNG_DOMAIN_KERNEL
;
2115 /* TODO: User-space tracer domain support */
2119 case LTTNG_LIST_CHANNELS
:
2122 * TODO: Only kernel channels are listed here. UST listing
2123 * is needed on lttng-ust 2.0 release.
2126 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2127 nb_chan
+= cmd_ctx
->session
->kernel_session
->channel_count
;
2130 ret
= setup_lttng_msg(cmd_ctx
,
2131 sizeof(struct lttng_channel
) * nb_chan
);
2136 list_lttng_channels(cmd_ctx
->session
,
2137 (struct lttng_channel
*)(cmd_ctx
->llm
->payload
));
2142 case LTTNG_LIST_EVENTS
:
2145 * TODO: Only kernel events are listed here. UST listing
2146 * is needed on lttng-ust 2.0 release.
2148 size_t nb_event
= 0;
2149 struct ltt_kernel_channel
*kchan
= NULL
;
2151 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2152 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.list
.channel_name
,
2153 cmd_ctx
->session
->kernel_session
);
2154 if (kchan
== NULL
) {
2155 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2158 nb_event
+= kchan
->event_count
;
2161 ret
= setup_lttng_msg(cmd_ctx
,
2162 sizeof(struct lttng_event
) * nb_event
);
2167 DBG("Listing events (%zu events)", nb_event
);
2169 list_lttng_events(kchan
,
2170 (struct lttng_event
*)(cmd_ctx
->llm
->payload
));
2175 case LTTNG_LIST_SESSIONS
:
2177 lock_session_list();
2179 if (session_list_ptr
->count
== 0) {
2180 ret
= LTTCOMM_NO_SESSION
;
2181 unlock_session_list();
2185 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) *
2186 session_list_ptr
->count
);
2188 unlock_session_list();
2192 /* Filled the session array */
2193 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
));
2195 unlock_session_list();
2200 case LTTNG_CALIBRATE
:
2202 /* Setup lttng message with no payload */
2203 ret
= setup_lttng_msg(cmd_ctx
, 0);
2208 switch (cmd_ctx
->lsm
->domain
.type
) {
2209 case LTTNG_DOMAIN_KERNEL
:
2211 struct lttng_kernel_calibrate kcalibrate
;
2213 kcalibrate
.type
= cmd_ctx
->lsm
->u
.calibrate
.type
;
2214 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2216 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2222 /* TODO: Userspace tracing */
2223 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2229 case LTTNG_REGISTER_CONSUMER
:
2233 /* Setup lttng message with no payload */
2234 ret
= setup_lttng_msg(cmd_ctx
, 0);
2239 switch (cmd_ctx
->lsm
->domain
.type
) {
2240 case LTTNG_DOMAIN_KERNEL
:
2242 /* Can't register a consumer if there is already one */
2243 if (cmd_ctx
->session
->kernel_session
->consumer_fd
!= 0) {
2244 ret
= LTTCOMM_CONNECT_FAIL
;
2248 sock
= lttcomm_connect_unix_sock(cmd_ctx
->lsm
->u
.reg
.path
);
2250 ret
= LTTCOMM_CONNECT_FAIL
;
2254 cmd_ctx
->session
->kernel_session
->consumer_fd
= sock
;
2258 /* TODO: Userspace tracing */
2259 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2268 /* Undefined command */
2269 ret
= setup_lttng_msg(cmd_ctx
, 0);
2278 /* Set return code */
2279 cmd_ctx
->llm
->ret_code
= ret
;
2281 if (cmd_ctx
->session
) {
2282 unlock_session(cmd_ctx
->session
);
2288 if (cmd_ctx
->llm
== NULL
) {
2289 DBG("Missing llm structure. Allocating one.");
2290 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
2294 /* Notify client of error */
2295 cmd_ctx
->llm
->ret_code
= ret
;
2298 if (cmd_ctx
->session
) {
2299 unlock_session(cmd_ctx
->session
);
2305 * This thread manage all clients request using the unix client socket for
2308 static void *thread_manage_clients(void *data
)
2311 struct command_ctx
*cmd_ctx
= NULL
;
2312 struct pollfd pollfd
[2];
2314 DBG("[thread] Manage client started");
2316 ret
= lttcomm_listen_unix_sock(client_sock
);
2321 /* First fd is always the quit pipe */
2322 pollfd
[0].fd
= thread_quit_pipe
[0];
2325 pollfd
[1].fd
= client_sock
;
2326 pollfd
[1].events
= POLLIN
;
2328 /* Notify parent pid that we are ready
2329 * to accept command for client side.
2331 if (opt_sig_parent
) {
2332 kill(ppid
, SIGCHLD
);
2336 DBG("Accepting client command ...");
2338 /* Inifinite blocking call, waiting for transmission */
2339 ret
= poll(pollfd
, 2, -1);
2341 perror("poll client thread");
2345 /* Thread quit pipe has been closed. Killing thread. */
2346 if (pollfd
[0].revents
== POLLNVAL
) {
2348 } else if (pollfd
[1].revents
== POLLERR
) {
2349 ERR("Client socket poll error");
2353 sock
= lttcomm_accept_unix_sock(client_sock
);
2358 /* Allocate context command to process the client request */
2359 cmd_ctx
= malloc(sizeof(struct command_ctx
));
2361 /* Allocate data buffer for reception */
2362 cmd_ctx
->lsm
= malloc(sizeof(struct lttcomm_session_msg
));
2363 cmd_ctx
->llm
= NULL
;
2364 cmd_ctx
->session
= NULL
;
2367 * Data is received from the lttng client. The struct
2368 * lttcomm_session_msg (lsm) contains the command and data request of
2371 DBG("Receiving data from client ...");
2372 ret
= lttcomm_recv_unix_sock(sock
, cmd_ctx
->lsm
, sizeof(struct lttcomm_session_msg
));
2377 // TODO: Validate cmd_ctx including sanity check for security purpose.
2380 * This function dispatch the work to the kernel or userspace tracer
2381 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2382 * informations for the client. The command context struct contains
2383 * everything this function may needs.
2385 ret
= process_client_msg(cmd_ctx
);
2387 /* TODO: Inform client somehow of the fatal error. At this point,
2388 * ret < 0 means that a malloc failed (ENOMEM). */
2389 /* Error detected but still accept command */
2390 clean_command_ctx(&cmd_ctx
);
2394 DBG("Sending response (size: %d, retcode: %d)",
2395 cmd_ctx
->lttng_msg_size
, cmd_ctx
->llm
->ret_code
);
2396 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
2398 ERR("Failed to send data back to client");
2401 clean_command_ctx(&cmd_ctx
);
2403 /* End of transmission */
2408 DBG("Client thread dying");
2416 unlink(client_unix_sock_path
);
2418 clean_command_ctx(&cmd_ctx
);
2424 * usage function on stderr
2426 static void usage(void)
2428 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
2429 fprintf(stderr
, " -h, --help Display this usage.\n");
2430 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
2431 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
2432 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
2433 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
2434 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
2435 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
2436 fprintf(stderr
, " -V, --version Show version number.\n");
2437 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
2438 fprintf(stderr
, " -q, --quiet No output at all.\n");
2439 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
2440 fprintf(stderr
, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n");
2444 * daemon argument parsing
2446 static int parse_args(int argc
, char **argv
)
2450 static struct option long_options
[] = {
2451 { "client-sock", 1, 0, 'c' },
2452 { "apps-sock", 1, 0, 'a' },
2453 { "kconsumerd-cmd-sock", 1, 0, 0 },
2454 { "kconsumerd-err-sock", 1, 0, 0 },
2455 { "daemonize", 0, 0, 'd' },
2456 { "sig-parent", 0, 0, 'S' },
2457 { "help", 0, 0, 'h' },
2458 { "group", 1, 0, 'g' },
2459 { "version", 0, 0, 'V' },
2460 { "quiet", 0, 0, 'q' },
2461 { "verbose", 0, 0, 'v' },
2462 { "verbose-kconsumerd", 0, 0, 'Z' },
2467 int option_index
= 0;
2468 c
= getopt_long(argc
, argv
, "dhqvVS" "a:c:g:s:E:C:Z", long_options
, &option_index
);
2475 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
2477 fprintf(stderr
, " with arg %s\n", optarg
);
2481 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2484 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2490 opt_tracing_group
= strdup(optarg
);
2496 fprintf(stdout
, "%s\n", VERSION
);
2502 snprintf(kconsumerd_err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2505 snprintf(kconsumerd_cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2511 /* Verbose level can increase using multiple -v */
2515 opt_verbose_kconsumerd
+= 1;
2518 /* Unknown option or other error.
2519 * Error is printed by getopt, just return */
2528 * Creates the two needed socket by the daemon.
2529 * apps_sock - The communication socket for all UST apps.
2530 * client_sock - The communication of the cli tool (lttng).
2532 static int init_daemon_socket(void)
2537 old_umask
= umask(0);
2539 /* Create client tool unix socket */
2540 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
2541 if (client_sock
< 0) {
2542 ERR("Create unix sock failed: %s", client_unix_sock_path
);
2547 /* File permission MUST be 660 */
2548 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
2550 ERR("Set file permissions failed: %s", client_unix_sock_path
);
2555 /* Create the application unix socket */
2556 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
2557 if (apps_sock
< 0) {
2558 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
2563 /* File permission MUST be 666 */
2564 ret
= chmod(apps_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
2566 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
2577 * Check if the global socket is available, and if a daemon is answering
2578 * at the other side. If yes, error is returned.
2580 static int check_existing_daemon(void)
2582 if (access(client_unix_sock_path
, F_OK
) < 0 &&
2583 access(apps_unix_sock_path
, F_OK
) < 0)
2585 /* Is there anybody out there ? */
2586 if (lttng_session_daemon_alive())
2593 * Set the tracing group gid onto the client socket.
2595 * Race window between mkdir and chown is OK because we are going from more
2596 * permissive (root.root) to les permissive (root.tracing).
2598 static int set_permissions(void)
2603 gid
= allowed_group();
2606 WARN("No tracing group detected");
2609 ERR("Missing tracing group. Aborting execution.");
2615 /* Set lttng run dir */
2616 ret
= chown(LTTNG_RUNDIR
, 0, gid
);
2618 ERR("Unable to set group on " LTTNG_RUNDIR
);
2622 /* lttng client socket path */
2623 ret
= chown(client_unix_sock_path
, 0, gid
);
2625 ERR("Unable to set group on %s", client_unix_sock_path
);
2629 /* kconsumerd error socket path */
2630 ret
= chown(kconsumerd_err_unix_sock_path
, 0, gid
);
2632 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path
);
2636 DBG("All permissions are set");
2643 * Create the pipe used to wake up the kernel thread.
2645 static int create_kernel_poll_pipe(void)
2647 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
2651 * Create the lttng run directory needed for all global sockets and pipe.
2653 static int create_lttng_rundir(void)
2657 ret
= mkdir(LTTNG_RUNDIR
, S_IRWXU
| S_IRWXG
);
2659 if (errno
!= EEXIST
) {
2660 ERR("Unable to create " LTTNG_RUNDIR
);
2672 * Setup sockets and directory needed by the kconsumerd communication with the
2675 static int set_kconsumerd_sockets(void)
2679 if (strlen(kconsumerd_err_unix_sock_path
) == 0) {
2680 snprintf(kconsumerd_err_unix_sock_path
, PATH_MAX
, KCONSUMERD_ERR_SOCK_PATH
);
2683 if (strlen(kconsumerd_cmd_unix_sock_path
) == 0) {
2684 snprintf(kconsumerd_cmd_unix_sock_path
, PATH_MAX
, KCONSUMERD_CMD_SOCK_PATH
);
2687 ret
= mkdir(KCONSUMERD_PATH
, S_IRWXU
| S_IRWXG
);
2689 if (errno
!= EEXIST
) {
2690 ERR("Failed to create " KCONSUMERD_PATH
);
2696 /* Create the kconsumerd error unix socket */
2697 kconsumerd_err_sock
= lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path
);
2698 if (kconsumerd_err_sock
< 0) {
2699 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path
);
2704 /* File permission MUST be 660 */
2705 ret
= chmod(kconsumerd_err_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
2707 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path
);
2717 * Signal handler for the daemon
2719 * Simply stop all worker threads, leaving main() return gracefully
2720 * after joining all threads and calling cleanup().
2722 static void sighandler(int sig
)
2726 DBG("SIGPIPE catched");
2729 DBG("SIGINT catched");
2733 DBG("SIGTERM catched");
2742 * Setup signal handler for :
2743 * SIGINT, SIGTERM, SIGPIPE
2745 static int set_signal_handler(void)
2748 struct sigaction sa
;
2751 if ((ret
= sigemptyset(&sigset
)) < 0) {
2752 perror("sigemptyset");
2756 sa
.sa_handler
= sighandler
;
2757 sa
.sa_mask
= sigset
;
2759 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
2760 perror("sigaction");
2764 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
2765 perror("sigaction");
2769 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
2770 perror("sigaction");
2774 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
2780 * Set open files limit to unlimited. This daemon can open a large number of
2781 * file descriptors in order to consumer multiple kernel traces.
2783 static void set_ulimit(void)
2788 /* The kernel does not allowed an infinite limit for open files */
2789 lim
.rlim_cur
= 65535;
2790 lim
.rlim_max
= 65535;
2792 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
2794 perror("failed to set open files limit");
2801 int main(int argc
, char **argv
)
2805 const char *home_path
;
2807 /* Create thread quit pipe */
2808 if ((ret
= init_thread_quit_pipe()) < 0) {
2812 /* Parse arguments */
2814 if ((ret
= parse_args(argc
, argv
) < 0)) {
2827 /* Check if daemon is UID = 0 */
2828 is_root
= !getuid();
2831 ret
= create_lttng_rundir();
2836 if (strlen(apps_unix_sock_path
) == 0) {
2837 snprintf(apps_unix_sock_path
, PATH_MAX
,
2838 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
2841 if (strlen(client_unix_sock_path
) == 0) {
2842 snprintf(client_unix_sock_path
, PATH_MAX
,
2843 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
2846 home_path
= get_home_dir();
2847 if (home_path
== NULL
) {
2848 /* TODO: Add --socket PATH option */
2849 ERR("Can't get HOME directory for sockets creation.");
2854 if (strlen(apps_unix_sock_path
) == 0) {
2855 snprintf(apps_unix_sock_path
, PATH_MAX
,
2856 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
2859 /* Set the cli tool unix socket path */
2860 if (strlen(client_unix_sock_path
) == 0) {
2861 snprintf(client_unix_sock_path
, PATH_MAX
,
2862 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
2866 DBG("Client socket path %s", client_unix_sock_path
);
2867 DBG("Application socket path %s", apps_unix_sock_path
);
2870 * See if daemon already exist.
2872 if ((ret
= check_existing_daemon()) < 0) {
2873 ERR("Already running daemon.\n");
2875 * We do not goto exit because we must not cleanup()
2876 * because a daemon is already running.
2881 /* After this point, we can safely call cleanup() so goto error is used */
2884 * These actions must be executed as root. We do that *after* setting up
2885 * the sockets path because we MUST make the check for another daemon using
2886 * those paths *before* trying to set the kernel consumer sockets and init
2890 ret
= set_kconsumerd_sockets();
2895 /* Setup kernel tracer */
2896 init_kernel_tracer();
2898 /* Set ulimit for open files */
2902 if ((ret
= set_signal_handler()) < 0) {
2906 /* Setup the needed unix socket */
2907 if ((ret
= init_daemon_socket()) < 0) {
2911 /* Set credentials to socket */
2912 if (is_root
&& ((ret
= set_permissions()) < 0)) {
2916 /* Get parent pid if -S, --sig-parent is specified. */
2917 if (opt_sig_parent
) {
2921 /* Setup the kernel pipe for waking up the kernel thread */
2922 if ((ret
= create_kernel_poll_pipe()) < 0) {
2927 * Get session list pointer. This pointer MUST NOT be free().
2928 * This list is statically declared in session.c
2930 session_list_ptr
= get_session_list();
2932 /* Create thread to manage the client socket */
2933 ret
= pthread_create(&client_thread
, NULL
, thread_manage_clients
, (void *) NULL
);
2935 perror("pthread_create");
2939 /* Create thread to manage application socket */
2940 ret
= pthread_create(&apps_thread
, NULL
, thread_manage_apps
, (void *) NULL
);
2942 perror("pthread_create");
2946 /* Create kernel thread to manage kernel event */
2947 ret
= pthread_create(&kernel_thread
, NULL
, thread_manage_kernel
, (void *) NULL
);
2949 perror("pthread_create");
2953 ret
= pthread_join(kernel_thread
, &status
);
2955 perror("pthread_join");
2956 goto error
; /* join error, exit without cleanup */
2960 ret
= pthread_join(apps_thread
, &status
);
2962 perror("pthread_join");
2963 goto error
; /* join error, exit without cleanup */
2967 ret
= pthread_join(client_thread
, &status
);
2969 perror("pthread_join");
2970 goto error
; /* join error, exit without cleanup */
2973 ret
= join_kconsumerd_thread();
2975 perror("join_kconsumerd");
2976 goto error
; /* join error, exit without cleanup */
2982 * cleanup() is called when no other thread is running.