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>
44 #include "kernel-ctl.h"
45 #include "ltt-sessiond.h"
46 #include "traceable-app.h"
51 const char default_home_dir
[] = DEFAULT_HOME_DIR
;
52 const char default_tracing_group
[] = LTTNG_DEFAULT_TRACING_GROUP
;
53 const char default_ust_sock_dir
[] = DEFAULT_UST_SOCK_DIR
;
54 const char default_global_apps_pipe
[] = DEFAULT_GLOBAL_APPS_PIPE
;
57 int opt_verbose
; /* Not static for lttngerr.h */
58 int opt_verbose_kconsumerd
; /* Not static for lttngerr.h */
59 int opt_quiet
; /* Not static for lttngerr.h */
62 const char *opt_tracing_group
;
63 static int opt_sig_parent
;
64 static int opt_daemon
;
65 static int is_root
; /* Set to 1 if the daemon is running as root */
66 static pid_t ppid
; /* Parent PID for --sig-parent option */
67 static pid_t kconsumerd_pid
;
68 static struct pollfd
*kernel_pollfd
;
70 static char apps_unix_sock_path
[PATH_MAX
]; /* Global application Unix socket path */
71 static char client_unix_sock_path
[PATH_MAX
]; /* Global client Unix socket path */
72 static char kconsumerd_err_unix_sock_path
[PATH_MAX
]; /* kconsumerd error Unix socket path */
73 static char kconsumerd_cmd_unix_sock_path
[PATH_MAX
]; /* kconsumerd command Unix socket path */
76 static int client_sock
;
78 static int kconsumerd_err_sock
;
79 static int kconsumerd_cmd_sock
;
80 static int kernel_tracer_fd
;
81 static int kernel_poll_pipe
[2];
84 * Quit pipe for all threads. This permits a single cancellation point
85 * for all threads when receiving an event on the pipe.
87 static int thread_quit_pipe
[2];
89 /* Pthread, Mutexes and Semaphores */
90 static pthread_t kconsumerd_thread
;
91 static pthread_t apps_thread
;
92 static pthread_t client_thread
;
93 static pthread_t kernel_thread
;
94 static sem_t kconsumerd_sem
;
96 static pthread_mutex_t kconsumerd_pid_mutex
; /* Mutex to control kconsumerd pid assignation */
98 static int modprobe_remove_kernel_modules(void);
101 * Pointer initialized before thread creation.
103 * This points to the tracing session list containing the session count and a
104 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
105 * MUST NOT be taken if you call a public function in session.c.
107 * The lock is nested inside the structure: session_list_ptr->lock. Please use
108 * lock_session_list and unlock_session_list for lock acquisition.
110 static struct ltt_session_list
*session_list_ptr
;
112 static gid_t
allowed_group(void)
116 if (opt_tracing_group
) {
117 grp
= getgrnam(opt_tracing_group
);
119 grp
= getgrnam(default_tracing_group
);
131 * Return -1 on error or 0 if all pipes are created.
133 static int init_thread_quit_pipe(void)
137 ret
= pipe2(thread_quit_pipe
, O_CLOEXEC
);
139 perror("thread quit pipe");
148 * Complete teardown of a kernel session. This free all data structure related
149 * to a kernel session and update counter.
151 static void teardown_kernel_session(struct ltt_session
*session
)
153 if (session
->kernel_session
!= NULL
) {
154 DBG("Tearing down kernel session");
157 * If a custom kernel consumer was registered, close the socket before
158 * tearing down the complete kernel session structure
160 if (session
->kernel_session
->consumer_fd
!= kconsumerd_cmd_sock
) {
161 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
164 trace_destroy_kernel_session(session
->kernel_session
);
165 /* Extra precaution */
166 session
->kernel_session
= NULL
;
170 static void stop_threads(void)
172 /* Stopping all threads */
173 DBG("Terminating all threads");
174 close(thread_quit_pipe
[0]);
175 close(thread_quit_pipe
[1]);
181 static void cleanup(void)
185 struct ltt_session
*sess
, *stmp
;
190 MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm"
191 "Matthew, BEET driven development works!%c[%dm",
192 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
195 DBG("Removing %s directory", LTTNG_RUNDIR
);
196 ret
= asprintf(&cmd
, "rm -rf " LTTNG_RUNDIR
);
198 ERR("asprintf failed. Something is really wrong!");
201 /* Remove lttng run directory */
204 ERR("Unable to clean " LTTNG_RUNDIR
);
207 DBG("Cleaning up all session");
209 /* Destroy session list mutex */
210 if (session_list_ptr
!= NULL
) {
211 pthread_mutex_destroy(&session_list_ptr
->lock
);
213 /* Cleanup ALL session */
214 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
215 teardown_kernel_session(sess
);
216 // TODO complete session cleanup (including UST)
220 pthread_mutex_destroy(&kconsumerd_pid_mutex
);
222 DBG("Closing kernel fd");
223 close(kernel_tracer_fd
);
225 DBG("Unloading kernel modules");
226 modprobe_remove_kernel_modules();
230 * Send data on a unix socket using the liblttsessiondcomm API.
232 * Return lttcomm error code.
234 static int send_unix_sock(int sock
, void *buf
, size_t len
)
236 /* Check valid length */
241 return lttcomm_send_unix_sock(sock
, buf
, len
);
245 * Free memory of a command context structure.
247 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
249 DBG("Clean command context structure");
251 if ((*cmd_ctx
)->llm
) {
252 free((*cmd_ctx
)->llm
);
254 if ((*cmd_ctx
)->lsm
) {
255 free((*cmd_ctx
)->lsm
);
263 * Send all stream fds of kernel channel to the consumer.
265 static int send_kconsumerd_channel_fds(int sock
, struct ltt_kernel_channel
*channel
)
269 struct ltt_kernel_stream
*stream
;
270 struct lttcomm_kconsumerd_header lkh
;
271 struct lttcomm_kconsumerd_msg lkm
;
273 DBG("Sending fds of channel %s to kernel consumer", channel
->channel
->name
);
275 nb_fd
= channel
->stream_count
;
278 lkh
.payload_size
= nb_fd
* sizeof(struct lttcomm_kconsumerd_msg
);
279 lkh
.cmd_type
= ADD_STREAM
;
281 DBG("Sending kconsumerd header");
283 ret
= lttcomm_send_unix_sock(sock
, &lkh
, sizeof(struct lttcomm_kconsumerd_header
));
285 perror("send kconsumerd header");
289 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
290 if (stream
->fd
!= 0) {
292 lkm
.state
= stream
->state
;
293 lkm
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
294 lkm
.output
= channel
->channel
->attr
.output
;
295 strncpy(lkm
.path_name
, stream
->pathname
, PATH_MAX
);
296 lkm
.path_name
[PATH_MAX
- 1] = '\0';
298 DBG("Sending fd %d to kconsumerd", lkm
.fd
);
300 ret
= lttcomm_send_fds_unix_sock(sock
, &lkm
, &lkm
.fd
, 1, sizeof(lkm
));
302 perror("send kconsumerd fd");
308 DBG("Kconsumerd channel fds sent");
317 * Send all stream fds of the kernel session to the consumer.
319 static int send_kconsumerd_fds(struct ltt_kernel_session
*session
)
322 struct ltt_kernel_channel
*chan
;
323 struct lttcomm_kconsumerd_header lkh
;
324 struct lttcomm_kconsumerd_msg lkm
;
327 lkh
.payload_size
= sizeof(struct lttcomm_kconsumerd_msg
);
328 lkh
.cmd_type
= ADD_STREAM
;
330 DBG("Sending kconsumerd header for metadata");
332 ret
= lttcomm_send_unix_sock(session
->consumer_fd
, &lkh
, sizeof(struct lttcomm_kconsumerd_header
));
334 perror("send kconsumerd header");
338 DBG("Sending metadata stream fd");
340 /* Extra protection. It's NOT suppose to be set to 0 at this point */
341 if (session
->consumer_fd
== 0) {
342 session
->consumer_fd
= kconsumerd_cmd_sock
;
345 if (session
->metadata_stream_fd
!= 0) {
346 /* Send metadata stream fd first */
347 lkm
.fd
= session
->metadata_stream_fd
;
348 lkm
.state
= ACTIVE_FD
;
349 lkm
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
350 lkm
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
351 strncpy(lkm
.path_name
, session
->metadata
->pathname
, PATH_MAX
);
352 lkm
.path_name
[PATH_MAX
- 1] = '\0';
354 ret
= lttcomm_send_fds_unix_sock(session
->consumer_fd
, &lkm
, &lkm
.fd
, 1, sizeof(lkm
));
356 perror("send kconsumerd fd");
361 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
362 ret
= send_kconsumerd_channel_fds(session
->consumer_fd
, chan
);
368 DBG("Kconsumerd fds (metadata and channel streams) sent");
378 * Return a socket connected to the libust communication socket of the
379 * application identified by the pid.
381 * If the pid is not found in the traceable list, return -1 to indicate error.
383 static int ust_connect_app(pid_t pid
)
386 struct ltt_traceable_app
*lta
;
388 DBG("Connect to application pid %d", pid
);
390 lta
= find_app_by_pid(pid
);
393 DBG("Application pid %d not found", pid
);
397 sock
= ustctl_connect_pid(lta
->pid
);
399 ERR("Fail connecting to the PID %d", pid
);
404 #endif /* DISABLED */
407 * Notify apps by writing 42 to a named pipe using name. Every applications
408 * waiting for a ltt-sessiond will be notified and re-register automatically to
409 * the session daemon.
411 * Return open or write error value.
413 static int notify_apps(const char *name
)
418 DBG("Notify the global application pipe");
420 /* Try opening the global pipe */
421 fd
= open(name
, O_WRONLY
);
426 /* Notify by writing on the pipe */
427 ret
= write(fd
, "42", 2);
437 * Setup the outgoing data buffer for the response (llm) by allocating the
438 * right amount of memory and copying the original information from the lsm
441 * Return total size of the buffer pointed by buf.
443 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
449 cmd_ctx
->llm
= malloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
450 if (cmd_ctx
->llm
== NULL
) {
456 /* Copy common data */
457 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
458 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
460 cmd_ctx
->llm
->data_size
= size
;
461 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
470 * Update the kernel pollfd set of all channel fd available over all tracing
471 * session. Add the wakeup pipe at the end of the set.
473 static int update_kernel_pollfd(void)
477 * The wakup pipe and the quit pipe are needed so the number of fds starts
478 * at 2 for those pipes.
480 unsigned int nb_fd
= 2;
481 struct ltt_session
*session
;
482 struct ltt_kernel_channel
*channel
;
484 DBG("Updating kernel_pollfd");
486 /* Get the number of channel of all kernel session */
488 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
489 lock_session(session
);
490 if (session
->kernel_session
== NULL
) {
491 unlock_session(session
);
494 nb_fd
+= session
->kernel_session
->channel_count
;
495 unlock_session(session
);
498 DBG("Resizing kernel_pollfd to size %d", nb_fd
);
500 kernel_pollfd
= realloc(kernel_pollfd
, nb_fd
* sizeof(struct pollfd
));
501 if (kernel_pollfd
== NULL
) {
502 perror("malloc kernel_pollfd");
506 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
507 lock_session(session
);
508 if (session
->kernel_session
== NULL
) {
509 unlock_session(session
);
513 ERR("To much channel for kernel_pollfd size");
514 unlock_session(session
);
517 cds_list_for_each_entry(channel
, &session
->kernel_session
->channel_list
.head
, list
) {
518 kernel_pollfd
[i
].fd
= channel
->fd
;
519 kernel_pollfd
[i
].events
= POLLIN
| POLLRDNORM
;
522 unlock_session(session
);
524 unlock_session_list();
526 /* Adding wake up pipe */
527 kernel_pollfd
[nb_fd
- 2].fd
= kernel_poll_pipe
[0];
528 kernel_pollfd
[nb_fd
- 2].events
= POLLIN
;
530 /* Adding the quit pipe */
531 kernel_pollfd
[nb_fd
- 1].fd
= thread_quit_pipe
[0];
536 unlock_session_list();
541 * Find the channel fd from 'fd' over all tracing session. When found, check
542 * for new channel stream and send those stream fds to the kernel consumer.
544 * Useful for CPU hotplug feature.
546 static int update_kernel_stream(int fd
)
549 struct ltt_session
*session
;
550 struct ltt_kernel_channel
*channel
;
552 DBG("Updating kernel streams for channel fd %d", fd
);
555 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
556 lock_session(session
);
557 if (session
->kernel_session
== NULL
) {
558 unlock_session(session
);
562 /* This is not suppose to be 0 but this is an extra security check */
563 if (session
->kernel_session
->consumer_fd
== 0) {
564 session
->kernel_session
->consumer_fd
= kconsumerd_cmd_sock
;
567 cds_list_for_each_entry(channel
, &session
->kernel_session
->channel_list
.head
, list
) {
568 if (channel
->fd
== fd
) {
569 DBG("Channel found, updating kernel streams");
570 ret
= kernel_open_channel_stream(channel
);
576 * Have we already sent fds to the consumer? If yes, it means that
577 * tracing is started so it is safe to send our updated stream fds.
579 if (session
->kernel_session
->kconsumer_fds_sent
== 1) {
580 ret
= send_kconsumerd_channel_fds(session
->kernel_session
->consumer_fd
,
589 unlock_session(session
);
593 unlock_session_list();
595 unlock_session(session
);
601 * This thread manage event coming from the kernel.
603 * Features supported in this thread:
606 static void *thread_manage_kernel(void *data
)
608 int ret
, i
, nb_fd
= 0;
610 int update_poll_flag
= 1;
612 DBG("Thread manage kernel started");
615 if (update_poll_flag
== 1) {
616 nb_fd
= update_kernel_pollfd();
620 update_poll_flag
= 0;
623 DBG("Polling on %d fds", nb_fd
);
625 /* Poll infinite value of time */
626 ret
= poll(kernel_pollfd
, nb_fd
, -1);
628 perror("poll kernel thread");
630 } else if (ret
== 0) {
631 /* Should not happen since timeout is infinite */
635 /* Thread quit pipe has been closed. Killing thread. */
636 if (kernel_pollfd
[nb_fd
- 1].revents
== POLLNVAL
) {
640 DBG("Kernel poll event triggered");
643 * Check if the wake up pipe was triggered. If so, the kernel_pollfd
646 switch (kernel_pollfd
[nb_fd
- 2].revents
) {
648 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
649 update_poll_flag
= 1;
657 for (i
= 0; i
< nb_fd
; i
++) {
658 switch (kernel_pollfd
[i
].revents
) {
660 * New CPU detected by the kernel. Adding kernel stream to kernel
661 * session and updating the kernel consumer
663 case POLLIN
| POLLRDNORM
:
664 ret
= update_kernel_stream(kernel_pollfd
[i
].fd
);
674 DBG("Kernel thread dying");
679 close(kernel_poll_pipe
[0]);
680 close(kernel_poll_pipe
[1]);
685 * This thread manage the kconsumerd error sent back to the session daemon.
687 static void *thread_manage_kconsumerd(void *data
)
690 enum lttcomm_return_code code
;
691 struct pollfd pollfd
[2];
693 DBG("[thread] Manage kconsumerd started");
695 ret
= lttcomm_listen_unix_sock(kconsumerd_err_sock
);
700 /* First fd is always the quit pipe */
701 pollfd
[0].fd
= thread_quit_pipe
[0];
704 pollfd
[1].fd
= kconsumerd_err_sock
;
705 pollfd
[1].events
= POLLIN
;
707 /* Inifinite blocking call, waiting for transmission */
708 ret
= poll(pollfd
, 2, -1);
710 perror("poll kconsumerd thread");
714 /* Thread quit pipe has been closed. Killing thread. */
715 if (pollfd
[0].revents
== POLLNVAL
) {
717 } else if (pollfd
[1].revents
== POLLERR
) {
718 ERR("Kconsumerd err socket poll error");
722 sock
= lttcomm_accept_unix_sock(kconsumerd_err_sock
);
727 /* Getting status code from kconsumerd */
728 ret
= lttcomm_recv_unix_sock(sock
, &code
, sizeof(enum lttcomm_return_code
));
733 if (code
== KCONSUMERD_COMMAND_SOCK_READY
) {
734 kconsumerd_cmd_sock
= lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path
);
735 if (kconsumerd_cmd_sock
< 0) {
736 sem_post(&kconsumerd_sem
);
737 perror("kconsumerd connect");
740 /* Signal condition to tell that the kconsumerd is ready */
741 sem_post(&kconsumerd_sem
);
742 DBG("Kconsumerd command socket ready");
744 DBG("Kconsumerd error when waiting for SOCK_READY : %s",
745 lttcomm_get_readable_code(-code
));
749 /* Kconsumerd err socket */
751 pollfd
[1].events
= POLLIN
;
753 /* Inifinite blocking call, waiting for transmission */
754 ret
= poll(pollfd
, 2, -1);
756 perror("poll kconsumerd thread");
760 /* Thread quit pipe has been closed. Killing thread. */
761 if (pollfd
[0].revents
== POLLNVAL
) {
763 } else if (pollfd
[1].revents
== POLLERR
) {
764 ERR("Kconsumerd err socket second poll error");
768 /* Wait for any kconsumerd error */
769 ret
= lttcomm_recv_unix_sock(sock
, &code
, sizeof(enum lttcomm_return_code
));
771 ERR("Kconsumerd closed the command socket");
775 ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code
));
778 DBG("Kconsumerd thread dying");
779 if (kconsumerd_err_sock
) {
780 close(kconsumerd_err_sock
);
782 if (kconsumerd_cmd_sock
) {
783 close(kconsumerd_cmd_sock
);
789 unlink(kconsumerd_err_unix_sock_path
);
790 unlink(kconsumerd_cmd_unix_sock_path
);
797 * This thread manage the application socket communication
799 static void *thread_manage_apps(void *data
)
802 struct pollfd pollfd
[2];
804 /* TODO: Something more elegant is needed but fine for now */
805 /* FIXME: change all types to either uint8_t, uint32_t, uint64_t
806 * for 32-bit vs 64-bit compat processes. */
807 /* replicate in ust with version number */
809 int reg
; /* 1:register, 0:unregister */
814 DBG("[thread] Manage apps started");
816 ret
= lttcomm_listen_unix_sock(apps_sock
);
821 /* First fd is always the quit pipe */
822 pollfd
[0].fd
= thread_quit_pipe
[0];
825 pollfd
[1].fd
= apps_sock
;
826 pollfd
[1].events
= POLLIN
;
828 /* Notify all applications to register */
829 notify_apps(default_global_apps_pipe
);
832 DBG("Accepting application registration");
834 /* Inifinite blocking call, waiting for transmission */
835 ret
= poll(pollfd
, 2, -1);
837 perror("poll apps thread");
841 /* Thread quit pipe has been closed. Killing thread. */
842 if (pollfd
[0].revents
== POLLNVAL
) {
844 } else if (pollfd
[1].revents
== POLLERR
) {
845 ERR("Apps socket poll error");
849 sock
= lttcomm_accept_unix_sock(apps_sock
);
855 * Using message-based transmissions to ensure we don't
856 * have to deal with partially received messages.
858 ret
= lttcomm_recv_unix_sock(sock
, ®_msg
, sizeof(reg_msg
));
864 /* Add application to the global traceable list */
865 if (reg_msg
.reg
== 1) {
868 * TODO: socket should be either passed to a
869 * listener thread (for more messages) or
870 * closed. It currently leaks.
872 ret
= register_traceable_app(reg_msg
.pid
, reg_msg
.uid
);
874 /* register_traceable_app only return an error with
875 * ENOMEM. At this point, we better stop everything.
881 unregister_traceable_app(reg_msg
.pid
);
886 DBG("Apps thread dying");
894 unlink(apps_unix_sock_path
);
899 * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
900 * exec or it will fails.
902 static int spawn_kconsumerd_thread(void)
906 /* Setup semaphore */
907 sem_init(&kconsumerd_sem
, 0, 0);
909 ret
= pthread_create(&kconsumerd_thread
, NULL
, thread_manage_kconsumerd
, (void *) NULL
);
911 perror("pthread_create kconsumerd");
915 /* Wait for the kconsumerd thread to be ready */
916 sem_wait(&kconsumerd_sem
);
918 if (kconsumerd_pid
== 0) {
919 ERR("Kconsumerd did not start");
926 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
931 * Join kernel consumer thread
933 static int join_kconsumerd_thread(void)
938 if (kconsumerd_pid
!= 0) {
939 ret
= kill(kconsumerd_pid
, SIGTERM
);
941 ERR("Error killing kconsumerd");
944 return pthread_join(kconsumerd_thread
, &status
);
951 * Fork and exec a kernel consumer daemon (kconsumerd).
953 * Return pid if successful else -1.
955 static pid_t
spawn_kconsumerd(void)
959 const char *verbosity
;
961 DBG("Spawning kconsumerd");
968 if (opt_verbose
> 1 || opt_verbose_kconsumerd
) {
969 verbosity
= "--verbose";
971 verbosity
= "--quiet";
973 execl(INSTALL_BIN_PATH
"/ltt-kconsumerd", "ltt-kconsumerd", verbosity
, NULL
);
975 perror("kernel start consumer exec");
978 } else if (pid
> 0) {
982 perror("kernel start consumer fork");
992 * Spawn the kconsumerd daemon and session daemon thread.
994 static int start_kconsumerd(void)
998 pthread_mutex_lock(&kconsumerd_pid_mutex
);
999 if (kconsumerd_pid
!= 0) {
1000 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
1004 ret
= spawn_kconsumerd();
1006 ERR("Spawning kconsumerd failed");
1007 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1008 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
1012 /* Setting up the global kconsumerd_pid */
1013 kconsumerd_pid
= ret
;
1014 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
1016 DBG("Kconsumerd pid %d", ret
);
1018 DBG("Spawning kconsumerd thread");
1019 ret
= spawn_kconsumerd_thread();
1021 ERR("Fatal error spawning kconsumerd thread");
1033 * modprobe_kernel_modules
1035 static int modprobe_kernel_modules(void)
1040 for (i
= 0; i
< ARRAY_SIZE(kernel_modules_list
); i
++) {
1041 ret
= snprintf(modprobe
, sizeof(modprobe
),
1042 "/sbin/modprobe %s%s",
1043 kernel_modules_list
[i
].required
? "" : "--quiet ",
1044 kernel_modules_list
[i
].name
);
1046 perror("snprintf modprobe");
1049 modprobe
[sizeof(modprobe
) - 1] = '\0';
1050 ret
= system(modprobe
);
1052 ERR("Unable to launch modprobe for module %s",
1053 kernel_modules_list
[i
].name
);
1054 } else if (kernel_modules_list
[i
].required
1055 && WEXITSTATUS(ret
) != 0) {
1056 ERR("Unable to load module %s",
1057 kernel_modules_list
[i
].name
);
1059 DBG("Modprobe successfully %s",
1060 kernel_modules_list
[i
].name
);
1069 * modprobe_remove_kernel_modules
1070 * Remove modules in reverse load order.
1072 static int modprobe_remove_kernel_modules(void)
1077 for (i
= ARRAY_SIZE(kernel_modules_list
) - 1; i
>= 0; i
--) {
1078 ret
= snprintf(modprobe
, sizeof(modprobe
),
1079 "/sbin/modprobe --remove --quiet %s",
1080 kernel_modules_list
[i
].name
);
1082 perror("snprintf modprobe --remove");
1085 modprobe
[sizeof(modprobe
) - 1] = '\0';
1086 ret
= system(modprobe
);
1088 ERR("Unable to launch modprobe --remove for module %s",
1089 kernel_modules_list
[i
].name
);
1090 } else if (kernel_modules_list
[i
].required
1091 && WEXITSTATUS(ret
) != 0) {
1092 ERR("Unable to remove module %s",
1093 kernel_modules_list
[i
].name
);
1095 DBG("Modprobe removal successful %s",
1096 kernel_modules_list
[i
].name
);
1107 static int mount_debugfs(char *path
)
1110 char *type
= "debugfs";
1112 ret
= mkdir_recursive(path
, S_IRWXU
| S_IRWXG
, geteuid(), getegid());
1117 ret
= mount(type
, path
, type
, 0, NULL
);
1119 perror("mount debugfs");
1123 DBG("Mounted debugfs successfully at %s", path
);
1130 * Setup necessary data for kernel tracer action.
1132 static void init_kernel_tracer(void)
1135 char *proc_mounts
= "/proc/mounts";
1137 char *debugfs_path
= NULL
, *lttng_path
;
1140 /* Detect debugfs */
1141 fp
= fopen(proc_mounts
, "r");
1143 ERR("Unable to probe %s", proc_mounts
);
1147 while (fgets(line
, sizeof(line
), fp
) != NULL
) {
1148 if (strstr(line
, "debugfs") != NULL
) {
1149 /* Remove first string */
1151 /* Dup string here so we can reuse line later on */
1152 debugfs_path
= strdup(strtok(NULL
, " "));
1153 DBG("Got debugfs path : %s", debugfs_path
);
1160 /* Mount debugfs if needded */
1161 if (debugfs_path
== NULL
) {
1162 ret
= asprintf(&debugfs_path
, "/mnt/debugfs");
1164 perror("asprintf debugfs path");
1167 ret
= mount_debugfs(debugfs_path
);
1173 /* Modprobe lttng kernel modules */
1174 ret
= modprobe_kernel_modules();
1179 /* Setup lttng kernel path */
1180 ret
= asprintf(<tng_path
, "%s/lttng", debugfs_path
);
1182 perror("asprintf lttng path");
1186 /* Open debugfs lttng */
1187 kernel_tracer_fd
= open(lttng_path
, O_RDWR
);
1188 if (kernel_tracer_fd
< 0) {
1189 DBG("Failed to open %s", lttng_path
);
1195 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1205 WARN("No kernel tracer available");
1206 kernel_tracer_fd
= 0;
1211 * Start tracing by creating trace directory and sending FDs to the kernel
1214 static int start_kernel_trace(struct ltt_kernel_session
*session
)
1218 if (session
->kconsumer_fds_sent
== 0) {
1220 * Assign default kernel consumer if no consumer assigned to the kernel
1221 * session. At this point, it's NOT suppose to be 0 but this is an extra
1224 if (session
->consumer_fd
== 0) {
1225 session
->consumer_fd
= kconsumerd_cmd_sock
;
1228 ret
= send_kconsumerd_fds(session
);
1230 ERR("Send kconsumerd fds failed");
1231 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1235 session
->kconsumer_fds_sent
= 1;
1243 * Notify kernel thread to update it's pollfd.
1245 static int notify_kernel_pollfd(void)
1249 /* Inform kernel thread of the new kernel channel */
1250 ret
= write(kernel_poll_pipe
[1], "!", 1);
1252 perror("write kernel poll pipe");
1259 * Allocate a channel structure and fill it.
1261 static struct lttng_channel
*init_default_channel(enum lttng_domain_type domain_type
,
1264 struct lttng_channel
*chan
;
1266 chan
= malloc(sizeof(struct lttng_channel
));
1268 perror("init channel malloc");
1272 if (snprintf(chan
->name
, NAME_MAX
, "%s", name
) < 0) {
1273 perror("snprintf channel name");
1277 chan
->attr
.overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
1278 chan
->attr
.switch_timer_interval
= DEFAULT_CHANNEL_SWITCH_TIMER
;
1279 chan
->attr
.read_timer_interval
= DEFAULT_CHANNEL_READ_TIMER
;
1281 switch (domain_type
) {
1282 case LTTNG_DOMAIN_KERNEL
:
1283 chan
->attr
.subbuf_size
= DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE
;
1284 chan
->attr
.num_subbuf
= DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
;
1285 chan
->attr
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
1289 goto error
; /* Not implemented */
1300 * Create a kernel tracer session then create the default channel.
1302 static int create_kernel_session(struct ltt_session
*session
)
1306 DBG("Creating kernel session");
1308 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1310 ret
= LTTCOMM_KERN_SESS_FAIL
;
1314 /* Set kernel consumer socket fd */
1315 if (kconsumerd_cmd_sock
) {
1316 session
->kernel_session
->consumer_fd
= kconsumerd_cmd_sock
;
1319 ret
= asprintf(&session
->kernel_session
->trace_path
, "%s/kernel",
1322 perror("asprintf kernel traces path");
1326 ret
= mkdir_recursive(session
->kernel_session
->trace_path
,
1327 S_IRWXU
| S_IRWXG
, geteuid(), allowed_group());
1329 if (ret
!= -EEXIST
) {
1330 ERR("Trace directory creation error");
1340 * Using the session list, filled a lttng_session array to send back to the
1341 * client for session listing.
1343 * The session list lock MUST be acquired before calling this function. Use
1344 * lock_session_list() and unlock_session_list().
1346 static void list_lttng_sessions(struct lttng_session
*sessions
)
1349 struct ltt_session
*session
;
1351 DBG("Getting all available session");
1353 * Iterate over session list and append data after the control struct in
1356 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1357 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
1358 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
1359 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
1360 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
1366 * Fill lttng_channel array of all channels.
1368 static void list_lttng_channels(struct ltt_session
*session
,
1369 struct lttng_channel
*channels
)
1372 struct ltt_kernel_channel
*kchan
;
1374 DBG("Listing channels for session %s", session
->name
);
1376 /* Kernel channels */
1377 if (session
->kernel_session
!= NULL
) {
1378 cds_list_for_each_entry(kchan
, &session
->kernel_session
->channel_list
.head
, list
) {
1379 /* Copy lttng_channel struct to array */
1380 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
1381 channels
[i
].enabled
= kchan
->enabled
;
1386 /* TODO: Missing UST listing */
1390 * Fill lttng_event array of all events in the channel.
1392 static void list_lttng_events(struct ltt_kernel_channel
*kchan
,
1393 struct lttng_event
*events
)
1396 * TODO: This is ONLY kernel. Need UST support.
1399 struct ltt_kernel_event
*event
;
1401 DBG("Listing events for channel %s", kchan
->channel
->name
);
1403 /* Kernel channels */
1404 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
1405 strncpy(events
[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
1406 events
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1407 events
[i
].enabled
= event
->enabled
;
1408 switch (event
->event
->instrumentation
) {
1409 case LTTNG_KERNEL_TRACEPOINT
:
1410 events
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1412 case LTTNG_KERNEL_KPROBE
:
1413 case LTTNG_KERNEL_KRETPROBE
:
1414 events
[i
].type
= LTTNG_EVENT_PROBE
;
1415 memcpy(&events
[i
].attr
.probe
, &event
->event
->u
.kprobe
,
1416 sizeof(struct lttng_kernel_kprobe
));
1418 case LTTNG_KERNEL_FUNCTION
:
1419 events
[i
].type
= LTTNG_EVENT_FUNCTION
;
1420 memcpy(&events
[i
].attr
.ftrace
, &event
->event
->u
.ftrace
,
1421 sizeof(struct lttng_kernel_function
));
1429 * Process the command requested by the lttng client within the command
1430 * context structure. This function make sure that the return structure (llm)
1431 * is set and ready for transmission before returning.
1433 * Return any error encountered or 0 for success.
1435 static int process_client_msg(struct command_ctx
*cmd_ctx
)
1437 int ret
= LTTCOMM_OK
;
1439 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
1442 * Commands that DO NOT need a session.
1444 switch (cmd_ctx
->lsm
->cmd_type
) {
1445 case LTTNG_CREATE_SESSION
:
1446 case LTTNG_LIST_SESSIONS
:
1447 case LTTNG_LIST_TRACEPOINTS
:
1448 case LTTNG_CALIBRATE
:
1451 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
1452 cmd_ctx
->session
= find_session_by_name(cmd_ctx
->lsm
->session
.name
);
1453 if (cmd_ctx
->session
== NULL
) {
1454 /* If session name not found */
1455 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
1456 ret
= LTTCOMM_SESS_NOT_FOUND
;
1457 } else { /* If no session name specified */
1458 ret
= LTTCOMM_SELECT_SESS
;
1462 /* Acquire lock for the session */
1463 lock_session(cmd_ctx
->session
);
1469 * Check domain type for specific "pre-action".
1471 switch (cmd_ctx
->lsm
->domain
.type
) {
1472 case LTTNG_DOMAIN_KERNEL
:
1473 /* Kernel tracer check */
1474 if (kernel_tracer_fd
== 0) {
1475 init_kernel_tracer();
1476 if (kernel_tracer_fd
== 0) {
1477 ret
= LTTCOMM_KERN_NA
;
1482 /* Need a session for kernel command */
1483 switch (cmd_ctx
->lsm
->cmd_type
) {
1484 case LTTNG_CALIBRATE
:
1485 case LTTNG_CREATE_SESSION
:
1486 case LTTNG_LIST_SESSIONS
:
1487 case LTTNG_LIST_TRACEPOINTS
:
1490 if (cmd_ctx
->session
->kernel_session
== NULL
) {
1491 ret
= create_kernel_session(cmd_ctx
->session
);
1493 ret
= LTTCOMM_KERN_SESS_FAIL
;
1497 /* Start the kernel consumer daemon */
1499 if (kconsumerd_pid
== 0 &&
1500 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
1501 ret
= start_kconsumerd();
1513 /* Process by command type */
1514 switch (cmd_ctx
->lsm
->cmd_type
) {
1515 case LTTNG_ADD_CONTEXT
:
1517 struct lttng_kernel_context kctx
;
1519 /* Setup lttng message with no payload */
1520 ret
= setup_lttng_msg(cmd_ctx
, 0);
1525 switch (cmd_ctx
->lsm
->domain
.type
) {
1526 case LTTNG_DOMAIN_KERNEL
:
1527 /* Create Kernel context */
1528 kctx
.ctx
= cmd_ctx
->lsm
->u
.context
.ctx
.ctx
;
1529 kctx
.u
.perf_counter
.type
= cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.type
;
1530 kctx
.u
.perf_counter
.config
= cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.config
;
1531 strncpy(kctx
.u
.perf_counter
.name
,
1532 cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.name
,
1533 LTTNG_SYMBOL_NAME_LEN
);
1534 kctx
.u
.perf_counter
.name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1536 /* Add kernel context to kernel tracer. See context.c */
1537 ret
= add_kernel_context(cmd_ctx
->session
->kernel_session
, &kctx
,
1538 cmd_ctx
->lsm
->u
.context
.event_name
,
1539 cmd_ctx
->lsm
->u
.context
.channel_name
);
1540 if (ret
!= LTTCOMM_OK
) {
1545 /* TODO: Userspace tracing */
1546 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1553 case LTTNG_DISABLE_CHANNEL
:
1555 struct ltt_kernel_channel
*kchan
;
1557 /* Setup lttng message with no payload */
1558 ret
= setup_lttng_msg(cmd_ctx
, 0);
1563 switch (cmd_ctx
->lsm
->domain
.type
) {
1564 case LTTNG_DOMAIN_KERNEL
:
1565 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1566 cmd_ctx
->session
->kernel_session
);
1567 if (kchan
== NULL
) {
1568 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1570 } else if (kchan
->enabled
== 1) {
1571 ret
= kernel_disable_channel(kchan
);
1573 if (ret
!= EEXIST
) {
1574 ret
= LTTCOMM_KERN_CHAN_DISABLE_FAIL
;
1579 kernel_wait_quiescent(kernel_tracer_fd
);
1582 /* TODO: Userspace tracing */
1583 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1590 case LTTNG_DISABLE_EVENT
:
1592 struct ltt_kernel_channel
*kchan
;
1593 struct ltt_kernel_event
*kevent
;
1595 /* Setup lttng message with no payload */
1596 ret
= setup_lttng_msg(cmd_ctx
, 0);
1601 switch (cmd_ctx
->lsm
->domain
.type
) {
1602 case LTTNG_DOMAIN_KERNEL
:
1603 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1604 cmd_ctx
->session
->kernel_session
);
1605 if (kchan
== NULL
) {
1606 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1610 kevent
= get_kernel_event_by_name(cmd_ctx
->lsm
->u
.disable
.name
, kchan
);
1611 if (kevent
!= NULL
) {
1612 DBG("Disabling kernel event %s for channel %s.", kevent
->event
->name
,
1613 kchan
->channel
->name
);
1614 ret
= kernel_disable_event(kevent
);
1616 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
1621 kernel_wait_quiescent(kernel_tracer_fd
);
1624 /* TODO: Userspace tracing */
1625 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1632 case LTTNG_DISABLE_ALL_EVENT
:
1634 struct ltt_kernel_channel
*kchan
;
1635 struct ltt_kernel_event
*kevent
;
1637 /* Setup lttng message with no payload */
1638 ret
= setup_lttng_msg(cmd_ctx
, 0);
1643 switch (cmd_ctx
->lsm
->domain
.type
) {
1644 case LTTNG_DOMAIN_KERNEL
:
1645 DBG("Disabling all enabled kernel events");
1646 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1647 cmd_ctx
->session
->kernel_session
);
1648 if (kchan
== NULL
) {
1649 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1653 /* For each event in the kernel session */
1654 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
1655 DBG("Disabling kernel event %s for channel %s.",
1656 kevent
->event
->name
, kchan
->channel
->name
);
1657 ret
= kernel_disable_event(kevent
);
1663 /* Quiescent wait after event disable */
1664 kernel_wait_quiescent(kernel_tracer_fd
);
1667 /* TODO: Userspace tracing */
1668 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1675 case LTTNG_ENABLE_CHANNEL
:
1677 struct ltt_kernel_channel
*kchan
;
1679 /* Setup lttng message with no payload */
1680 ret
= setup_lttng_msg(cmd_ctx
, 0);
1685 switch (cmd_ctx
->lsm
->domain
.type
) {
1686 case LTTNG_DOMAIN_KERNEL
:
1687 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.enable
.channel_name
,
1688 cmd_ctx
->session
->kernel_session
);
1689 if (kchan
== NULL
) {
1690 /* Channel not found, creating it */
1691 DBG("Creating kernel channel");
1693 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1694 &cmd_ctx
->lsm
->u
.channel
.chan
,
1695 cmd_ctx
->session
->kernel_session
->trace_path
);
1697 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1701 /* Notify kernel thread that there is a new channel */
1702 ret
= notify_kernel_pollfd();
1704 ret
= LTTCOMM_FATAL
;
1707 } else if (kchan
->enabled
== 0) {
1708 ret
= kernel_enable_channel(kchan
);
1710 if (ret
!= EEXIST
) {
1711 ret
= LTTCOMM_KERN_CHAN_ENABLE_FAIL
;
1717 kernel_wait_quiescent(kernel_tracer_fd
);
1720 /* TODO: Userspace tracing */
1721 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1728 case LTTNG_ENABLE_EVENT
:
1731 struct ltt_kernel_channel
*kchan
;
1732 struct ltt_kernel_event
*kevent
;
1733 struct lttng_channel
*chan
;
1735 /* Setup lttng message with no payload */
1736 ret
= setup_lttng_msg(cmd_ctx
, 0);
1741 channel_name
= cmd_ctx
->lsm
->u
.enable
.channel_name
;
1743 switch (cmd_ctx
->lsm
->domain
.type
) {
1744 case LTTNG_DOMAIN_KERNEL
:
1745 kchan
= get_kernel_channel_by_name(channel_name
,
1746 cmd_ctx
->session
->kernel_session
);
1747 if (kchan
== NULL
) {
1748 DBG("Channel not found. Creating channel %s", channel_name
);
1750 chan
= init_default_channel(cmd_ctx
->lsm
->domain
.type
, channel_name
);
1752 ret
= LTTCOMM_FATAL
;
1756 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1757 chan
, cmd_ctx
->session
->kernel_session
->trace_path
);
1759 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1762 kchan
= get_kernel_channel_by_name(channel_name
,
1763 cmd_ctx
->session
->kernel_session
);
1764 if (kchan
== NULL
) {
1765 ERR("Channel %s not found after creation. Internal error, giving up.",
1767 ret
= LTTCOMM_FATAL
;
1772 kevent
= get_kernel_event_by_name(cmd_ctx
->lsm
->u
.enable
.event
.name
, kchan
);
1773 if (kevent
== NULL
) {
1774 DBG("Creating kernel event %s for channel %s.",
1775 cmd_ctx
->lsm
->u
.enable
.event
.name
, channel_name
);
1776 ret
= kernel_create_event(&cmd_ctx
->lsm
->u
.enable
.event
, kchan
);
1778 DBG("Enabling kernel event %s for channel %s.",
1779 kevent
->event
->name
, channel_name
);
1780 ret
= kernel_enable_event(kevent
);
1781 if (ret
== -EEXIST
) {
1782 ret
= LTTCOMM_KERN_EVENT_EXIST
;
1788 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
1792 kernel_wait_quiescent(kernel_tracer_fd
);
1795 /* TODO: Userspace tracing */
1796 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1802 case LTTNG_ENABLE_ALL_EVENT
:
1806 struct ltt_kernel_channel
*kchan
;
1807 struct ltt_kernel_event
*kevent
;
1808 struct lttng_event
*event_list
;
1809 struct lttng_channel
*chan
;
1811 /* Setup lttng message with no payload */
1812 ret
= setup_lttng_msg(cmd_ctx
, 0);
1817 DBG("Enabling all kernel event");
1819 channel_name
= cmd_ctx
->lsm
->u
.enable
.channel_name
;
1821 switch (cmd_ctx
->lsm
->domain
.type
) {
1822 case LTTNG_DOMAIN_KERNEL
:
1823 kchan
= get_kernel_channel_by_name(channel_name
,
1824 cmd_ctx
->session
->kernel_session
);
1825 if (kchan
== NULL
) {
1826 DBG("Channel not found. Creating channel %s", channel_name
);
1828 chan
= init_default_channel(cmd_ctx
->lsm
->domain
.type
, channel_name
);
1830 ret
= LTTCOMM_FATAL
;
1834 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1835 chan
, cmd_ctx
->session
->kernel_session
->trace_path
);
1837 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1840 kchan
= get_kernel_channel_by_name(channel_name
,
1841 cmd_ctx
->session
->kernel_session
);
1842 if (kchan
== NULL
) {
1843 ERR("Channel %s not found after creation. Internal error, giving up.",
1845 ret
= LTTCOMM_FATAL
;
1850 /* For each event in the kernel session */
1851 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
1852 DBG("Enabling kernel event %s for channel %s.",
1853 kevent
->event
->name
, channel_name
);
1854 ret
= kernel_enable_event(kevent
);
1860 size
= kernel_list_events(kernel_tracer_fd
, &event_list
);
1862 ret
= LTTCOMM_KERN_LIST_FAIL
;
1866 for (i
= 0; i
< size
; i
++) {
1867 kevent
= get_kernel_event_by_name(event_list
[i
].name
, kchan
);
1868 if (kevent
== NULL
) {
1869 /* Default event type for enable all */
1870 event_list
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1871 /* Enable each single tracepoint event */
1872 ret
= kernel_create_event(&event_list
[i
], kchan
);
1874 /* Ignore error here and continue */
1881 /* Quiescent wait after event enable */
1882 kernel_wait_quiescent(kernel_tracer_fd
);
1885 /* TODO: Userspace tracing */
1886 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1893 case LTTNG_LIST_TRACEPOINTS
:
1895 struct lttng_event
*events
;
1896 ssize_t nb_events
= 0;
1898 switch (cmd_ctx
->lsm
->domain
.type
) {
1899 case LTTNG_DOMAIN_KERNEL
:
1900 DBG("Listing kernel events");
1901 nb_events
= kernel_list_events(kernel_tracer_fd
, &events
);
1902 if (nb_events
< 0) {
1903 ret
= LTTCOMM_KERN_LIST_FAIL
;
1908 /* TODO: Userspace listing */
1909 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1914 * Setup lttng message with payload size set to the event list size in
1915 * bytes and then copy list into the llm payload.
1917 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
1923 /* Copy event list into message payload */
1924 memcpy(cmd_ctx
->llm
->payload
, events
,
1925 sizeof(struct lttng_event
) * nb_events
);
1932 case LTTNG_START_TRACE
:
1934 struct ltt_kernel_channel
*chan
;
1936 /* Setup lttng message with no payload */
1937 ret
= setup_lttng_msg(cmd_ctx
, 0);
1942 /* Kernel tracing */
1943 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
1944 if (cmd_ctx
->session
->kernel_session
->metadata
== NULL
) {
1945 DBG("Open kernel metadata");
1946 ret
= kernel_open_metadata(cmd_ctx
->session
->kernel_session
,
1947 cmd_ctx
->session
->kernel_session
->trace_path
);
1949 ret
= LTTCOMM_KERN_META_FAIL
;
1954 if (cmd_ctx
->session
->kernel_session
->metadata_stream_fd
== 0) {
1955 DBG("Opening kernel metadata stream");
1956 if (cmd_ctx
->session
->kernel_session
->metadata_stream_fd
== 0) {
1957 ret
= kernel_open_metadata_stream(cmd_ctx
->session
->kernel_session
);
1959 ERR("Kernel create metadata stream failed");
1960 ret
= LTTCOMM_KERN_STREAM_FAIL
;
1966 /* For each channel */
1967 cds_list_for_each_entry(chan
,
1968 &cmd_ctx
->session
->kernel_session
->channel_list
.head
, list
) {
1969 if (chan
->stream_count
== 0) {
1970 ret
= kernel_open_channel_stream(chan
);
1972 ERR("Kernel create channel stream failed");
1973 ret
= LTTCOMM_KERN_STREAM_FAIL
;
1976 /* Update the stream global counter */
1977 cmd_ctx
->session
->kernel_session
->stream_count_global
+= ret
;
1981 ret
= start_kernel_trace(cmd_ctx
->session
->kernel_session
);
1983 ret
= LTTCOMM_KERN_START_FAIL
;
1987 DBG("Start kernel tracing");
1988 ret
= kernel_start_session(cmd_ctx
->session
->kernel_session
);
1990 ERR("Kernel start session failed");
1991 ret
= LTTCOMM_KERN_START_FAIL
;
1995 /* Quiescent wait after starting trace */
1996 kernel_wait_quiescent(kernel_tracer_fd
);
1999 /* TODO: Start all UST traces */
2004 case LTTNG_STOP_TRACE
:
2006 struct ltt_kernel_channel
*chan
;
2007 /* Setup lttng message with no payload */
2008 ret
= setup_lttng_msg(cmd_ctx
, 0);
2014 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2015 DBG("Stop kernel tracing");
2017 ret
= kernel_metadata_flush_buffer(cmd_ctx
->session
->kernel_session
->metadata_stream_fd
);
2019 ERR("Kernel metadata flush failed");
2022 cds_list_for_each_entry(chan
, &cmd_ctx
->session
->kernel_session
->channel_list
.head
, list
) {
2023 ret
= kernel_flush_buffer(chan
);
2025 ERR("Kernel flush buffer error");
2029 ret
= kernel_stop_session(cmd_ctx
->session
->kernel_session
);
2031 ERR("Kernel stop session failed");
2032 ret
= LTTCOMM_KERN_STOP_FAIL
;
2036 /* Quiescent wait after stopping trace */
2037 kernel_wait_quiescent(kernel_tracer_fd
);
2040 /* TODO : User-space tracer */
2045 case LTTNG_CREATE_SESSION
:
2047 /* Setup lttng message with no payload */
2048 ret
= setup_lttng_msg(cmd_ctx
, 0);
2053 ret
= create_session(cmd_ctx
->lsm
->session
.name
, cmd_ctx
->lsm
->session
.path
);
2055 if (ret
== -EEXIST
) {
2056 ret
= LTTCOMM_EXIST_SESS
;
2058 ret
= LTTCOMM_FATAL
;
2066 case LTTNG_DESTROY_SESSION
:
2068 /* Setup lttng message with no payload */
2069 ret
= setup_lttng_msg(cmd_ctx
, 0);
2074 /* Clean kernel session teardown */
2075 teardown_kernel_session(cmd_ctx
->session
);
2077 ret
= destroy_session(cmd_ctx
->lsm
->session
.name
);
2079 ret
= LTTCOMM_FATAL
;
2084 * Must notify the kernel thread here to update it's pollfd in order to
2085 * remove the channel(s)' fd just destroyed.
2087 ret
= notify_kernel_pollfd();
2089 ret
= LTTCOMM_FATAL
;
2096 case LTTNG_LIST_DOMAINS
:
2100 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2104 nb_dom
+= cmd_ctx
->session
->ust_trace_count
;
2106 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_domain
) * nb_dom
);
2111 ((struct lttng_domain
*)(cmd_ctx
->llm
->payload
))[0].type
=
2112 LTTNG_DOMAIN_KERNEL
;
2114 /* TODO: User-space tracer domain support */
2118 case LTTNG_LIST_CHANNELS
:
2121 * TODO: Only kernel channels are listed here. UST listing
2122 * is needed on lttng-ust 2.0 release.
2125 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2126 nb_chan
+= cmd_ctx
->session
->kernel_session
->channel_count
;
2129 ret
= setup_lttng_msg(cmd_ctx
,
2130 sizeof(struct lttng_channel
) * nb_chan
);
2135 list_lttng_channels(cmd_ctx
->session
,
2136 (struct lttng_channel
*)(cmd_ctx
->llm
->payload
));
2141 case LTTNG_LIST_EVENTS
:
2144 * TODO: Only kernel events are listed here. UST listing
2145 * is needed on lttng-ust 2.0 release.
2147 size_t nb_event
= 0;
2148 struct ltt_kernel_channel
*kchan
= NULL
;
2150 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2151 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.list
.channel_name
,
2152 cmd_ctx
->session
->kernel_session
);
2153 if (kchan
== NULL
) {
2154 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2157 nb_event
+= kchan
->event_count
;
2160 ret
= setup_lttng_msg(cmd_ctx
,
2161 sizeof(struct lttng_event
) * nb_event
);
2166 DBG("Listing events (%zu events)", nb_event
);
2168 list_lttng_events(kchan
,
2169 (struct lttng_event
*)(cmd_ctx
->llm
->payload
));
2174 case LTTNG_LIST_SESSIONS
:
2176 lock_session_list();
2178 if (session_list_ptr
->count
== 0) {
2179 ret
= LTTCOMM_NO_SESSION
;
2180 unlock_session_list();
2184 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) *
2185 session_list_ptr
->count
);
2187 unlock_session_list();
2191 /* Filled the session array */
2192 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
));
2194 unlock_session_list();
2199 case LTTNG_CALIBRATE
:
2201 /* Setup lttng message with no payload */
2202 ret
= setup_lttng_msg(cmd_ctx
, 0);
2207 switch (cmd_ctx
->lsm
->domain
.type
) {
2208 case LTTNG_DOMAIN_KERNEL
:
2210 struct lttng_kernel_calibrate kcalibrate
;
2212 kcalibrate
.type
= cmd_ctx
->lsm
->u
.calibrate
.type
;
2213 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2215 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2221 /* TODO: Userspace tracing */
2222 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2228 case LTTNG_REGISTER_CONSUMER
:
2232 /* Setup lttng message with no payload */
2233 ret
= setup_lttng_msg(cmd_ctx
, 0);
2238 switch (cmd_ctx
->lsm
->domain
.type
) {
2239 case LTTNG_DOMAIN_KERNEL
:
2241 /* Can't register a consumer if there is already one */
2242 if (cmd_ctx
->session
->kernel_session
->consumer_fd
!= 0) {
2243 ret
= LTTCOMM_CONNECT_FAIL
;
2247 sock
= lttcomm_connect_unix_sock(cmd_ctx
->lsm
->u
.reg
.path
);
2249 ret
= LTTCOMM_CONNECT_FAIL
;
2253 cmd_ctx
->session
->kernel_session
->consumer_fd
= sock
;
2257 /* TODO: Userspace tracing */
2258 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2267 /* Undefined command */
2268 ret
= setup_lttng_msg(cmd_ctx
, 0);
2277 /* Set return code */
2278 cmd_ctx
->llm
->ret_code
= ret
;
2280 if (cmd_ctx
->session
) {
2281 unlock_session(cmd_ctx
->session
);
2287 if (cmd_ctx
->llm
== NULL
) {
2288 DBG("Missing llm structure. Allocating one.");
2289 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
2293 /* Notify client of error */
2294 cmd_ctx
->llm
->ret_code
= ret
;
2297 if (cmd_ctx
->session
) {
2298 unlock_session(cmd_ctx
->session
);
2304 * This thread manage all clients request using the unix client socket for
2307 static void *thread_manage_clients(void *data
)
2310 struct command_ctx
*cmd_ctx
= NULL
;
2311 struct pollfd pollfd
[2];
2313 DBG("[thread] Manage client started");
2315 ret
= lttcomm_listen_unix_sock(client_sock
);
2320 /* First fd is always the quit pipe */
2321 pollfd
[0].fd
= thread_quit_pipe
[0];
2324 pollfd
[1].fd
= client_sock
;
2325 pollfd
[1].events
= POLLIN
;
2327 /* Notify parent pid that we are ready
2328 * to accept command for client side.
2330 if (opt_sig_parent
) {
2331 kill(ppid
, SIGCHLD
);
2335 DBG("Accepting client command ...");
2337 /* Inifinite blocking call, waiting for transmission */
2338 ret
= poll(pollfd
, 2, -1);
2340 perror("poll client thread");
2344 /* Thread quit pipe has been closed. Killing thread. */
2345 if (pollfd
[0].revents
== POLLNVAL
) {
2347 } else if (pollfd
[1].revents
== POLLERR
) {
2348 ERR("Client socket poll error");
2352 sock
= lttcomm_accept_unix_sock(client_sock
);
2357 /* Allocate context command to process the client request */
2358 cmd_ctx
= malloc(sizeof(struct command_ctx
));
2360 /* Allocate data buffer for reception */
2361 cmd_ctx
->lsm
= malloc(sizeof(struct lttcomm_session_msg
));
2362 cmd_ctx
->llm
= NULL
;
2363 cmd_ctx
->session
= NULL
;
2366 * Data is received from the lttng client. The struct
2367 * lttcomm_session_msg (lsm) contains the command and data request of
2370 DBG("Receiving data from client ...");
2371 ret
= lttcomm_recv_unix_sock(sock
, cmd_ctx
->lsm
, sizeof(struct lttcomm_session_msg
));
2376 // TODO: Validate cmd_ctx including sanity check for security purpose.
2379 * This function dispatch the work to the kernel or userspace tracer
2380 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2381 * informations for the client. The command context struct contains
2382 * everything this function may needs.
2384 ret
= process_client_msg(cmd_ctx
);
2386 /* TODO: Inform client somehow of the fatal error. At this point,
2387 * ret < 0 means that a malloc failed (ENOMEM). */
2388 /* Error detected but still accept command */
2389 clean_command_ctx(&cmd_ctx
);
2393 DBG("Sending response (size: %d, retcode: %d)",
2394 cmd_ctx
->lttng_msg_size
, cmd_ctx
->llm
->ret_code
);
2395 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
2397 ERR("Failed to send data back to client");
2400 clean_command_ctx(&cmd_ctx
);
2402 /* End of transmission */
2407 DBG("Client thread dying");
2415 unlink(client_unix_sock_path
);
2417 clean_command_ctx(&cmd_ctx
);
2423 * usage function on stderr
2425 static void usage(void)
2427 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
2428 fprintf(stderr
, " -h, --help Display this usage.\n");
2429 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
2430 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
2431 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
2432 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
2433 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
2434 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
2435 fprintf(stderr
, " -V, --version Show version number.\n");
2436 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
2437 fprintf(stderr
, " -q, --quiet No output at all.\n");
2438 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
2439 fprintf(stderr
, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n");
2443 * daemon argument parsing
2445 static int parse_args(int argc
, char **argv
)
2449 static struct option long_options
[] = {
2450 { "client-sock", 1, 0, 'c' },
2451 { "apps-sock", 1, 0, 'a' },
2452 { "kconsumerd-cmd-sock", 1, 0, 0 },
2453 { "kconsumerd-err-sock", 1, 0, 0 },
2454 { "daemonize", 0, 0, 'd' },
2455 { "sig-parent", 0, 0, 'S' },
2456 { "help", 0, 0, 'h' },
2457 { "group", 1, 0, 'g' },
2458 { "version", 0, 0, 'V' },
2459 { "quiet", 0, 0, 'q' },
2460 { "verbose", 0, 0, 'v' },
2461 { "verbose-kconsumerd", 0, 0, 'Z' },
2466 int option_index
= 0;
2467 c
= getopt_long(argc
, argv
, "dhqvVS" "a:c:g:s:E:C:Z", long_options
, &option_index
);
2474 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
2476 fprintf(stderr
, " with arg %s\n", optarg
);
2480 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2483 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2489 opt_tracing_group
= strdup(optarg
);
2495 fprintf(stdout
, "%s\n", VERSION
);
2501 snprintf(kconsumerd_err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2504 snprintf(kconsumerd_cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2510 /* Verbose level can increase using multiple -v */
2514 opt_verbose_kconsumerd
+= 1;
2517 /* Unknown option or other error.
2518 * Error is printed by getopt, just return */
2527 * Creates the two needed socket by the daemon.
2528 * apps_sock - The communication socket for all UST apps.
2529 * client_sock - The communication of the cli tool (lttng).
2531 static int init_daemon_socket(void)
2536 old_umask
= umask(0);
2538 /* Create client tool unix socket */
2539 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
2540 if (client_sock
< 0) {
2541 ERR("Create unix sock failed: %s", client_unix_sock_path
);
2546 /* File permission MUST be 660 */
2547 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
2549 ERR("Set file permissions failed: %s", client_unix_sock_path
);
2554 /* Create the application unix socket */
2555 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
2556 if (apps_sock
< 0) {
2557 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
2562 /* File permission MUST be 666 */
2563 ret
= chmod(apps_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
2565 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
2576 * Check if the global socket is available, and if a daemon is answering
2577 * at the other side. If yes, error is returned.
2579 static int check_existing_daemon(void)
2581 if (access(client_unix_sock_path
, F_OK
) < 0 &&
2582 access(apps_unix_sock_path
, F_OK
) < 0)
2584 /* Is there anybody out there ? */
2585 if (lttng_session_daemon_alive())
2592 * Set the tracing group gid onto the client socket.
2594 * Race window between mkdir and chown is OK because we are going from more
2595 * permissive (root.root) to les permissive (root.tracing).
2597 static int set_permissions(void)
2602 gid
= allowed_group();
2605 WARN("No tracing group detected");
2608 ERR("Missing tracing group. Aborting execution.");
2614 /* Set lttng run dir */
2615 ret
= chown(LTTNG_RUNDIR
, 0, gid
);
2617 ERR("Unable to set group on " LTTNG_RUNDIR
);
2621 /* lttng client socket path */
2622 ret
= chown(client_unix_sock_path
, 0, gid
);
2624 ERR("Unable to set group on %s", client_unix_sock_path
);
2628 /* kconsumerd error socket path */
2629 ret
= chown(kconsumerd_err_unix_sock_path
, 0, gid
);
2631 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path
);
2635 DBG("All permissions are set");
2642 * Create the pipe used to wake up the kernel thread.
2644 static int create_kernel_poll_pipe(void)
2646 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
2650 * Create the lttng run directory needed for all global sockets and pipe.
2652 static int create_lttng_rundir(void)
2656 ret
= mkdir(LTTNG_RUNDIR
, S_IRWXU
| S_IRWXG
);
2658 if (errno
!= EEXIST
) {
2659 ERR("Unable to create " LTTNG_RUNDIR
);
2671 * Setup sockets and directory needed by the kconsumerd communication with the
2674 static int set_kconsumerd_sockets(void)
2678 if (strlen(kconsumerd_err_unix_sock_path
) == 0) {
2679 snprintf(kconsumerd_err_unix_sock_path
, PATH_MAX
, KCONSUMERD_ERR_SOCK_PATH
);
2682 if (strlen(kconsumerd_cmd_unix_sock_path
) == 0) {
2683 snprintf(kconsumerd_cmd_unix_sock_path
, PATH_MAX
, KCONSUMERD_CMD_SOCK_PATH
);
2686 ret
= mkdir(KCONSUMERD_PATH
, S_IRWXU
| S_IRWXG
);
2688 if (errno
!= EEXIST
) {
2689 ERR("Failed to create " KCONSUMERD_PATH
);
2695 /* Create the kconsumerd error unix socket */
2696 kconsumerd_err_sock
= lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path
);
2697 if (kconsumerd_err_sock
< 0) {
2698 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path
);
2703 /* File permission MUST be 660 */
2704 ret
= chmod(kconsumerd_err_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
2706 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path
);
2716 * Signal handler for the daemon
2718 * Simply stop all worker threads, leaving main() return gracefully
2719 * after joining all threads and calling cleanup().
2721 static void sighandler(int sig
)
2725 DBG("SIGPIPE catched");
2728 DBG("SIGINT catched");
2732 DBG("SIGTERM catched");
2741 * Setup signal handler for :
2742 * SIGINT, SIGTERM, SIGPIPE
2744 static int set_signal_handler(void)
2747 struct sigaction sa
;
2750 if ((ret
= sigemptyset(&sigset
)) < 0) {
2751 perror("sigemptyset");
2755 sa
.sa_handler
= sighandler
;
2756 sa
.sa_mask
= sigset
;
2758 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
2759 perror("sigaction");
2763 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
2764 perror("sigaction");
2768 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
2769 perror("sigaction");
2773 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
2779 * Set open files limit to unlimited. This daemon can open a large number of
2780 * file descriptors in order to consumer multiple kernel traces.
2782 static void set_ulimit(void)
2787 /* The kernel does not allowed an infinite limit for open files */
2788 lim
.rlim_cur
= 65535;
2789 lim
.rlim_max
= 65535;
2791 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
2793 perror("failed to set open files limit");
2800 int main(int argc
, char **argv
)
2804 const char *home_path
;
2806 /* Create thread quit pipe */
2807 if ((ret
= init_thread_quit_pipe()) < 0) {
2811 /* Parse arguments */
2813 if ((ret
= parse_args(argc
, argv
) < 0)) {
2826 /* Check if daemon is UID = 0 */
2827 is_root
= !getuid();
2830 ret
= create_lttng_rundir();
2835 if (strlen(apps_unix_sock_path
) == 0) {
2836 snprintf(apps_unix_sock_path
, PATH_MAX
,
2837 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
2840 if (strlen(client_unix_sock_path
) == 0) {
2841 snprintf(client_unix_sock_path
, PATH_MAX
,
2842 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
2845 home_path
= get_home_dir();
2846 if (home_path
== NULL
) {
2847 /* TODO: Add --socket PATH option */
2848 ERR("Can't get HOME directory for sockets creation.");
2853 if (strlen(apps_unix_sock_path
) == 0) {
2854 snprintf(apps_unix_sock_path
, PATH_MAX
,
2855 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
2858 /* Set the cli tool unix socket path */
2859 if (strlen(client_unix_sock_path
) == 0) {
2860 snprintf(client_unix_sock_path
, PATH_MAX
,
2861 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
2865 DBG("Client socket path %s", client_unix_sock_path
);
2866 DBG("Application socket path %s", apps_unix_sock_path
);
2869 * See if daemon already exist.
2871 if ((ret
= check_existing_daemon()) < 0) {
2872 ERR("Already running daemon.\n");
2874 * We do not goto exit because we must not cleanup()
2875 * because a daemon is already running.
2880 /* After this point, we can safely call cleanup() so goto error is used */
2883 * These actions must be executed as root. We do that *after* setting up
2884 * the sockets path because we MUST make the check for another daemon using
2885 * those paths *before* trying to set the kernel consumer sockets and init
2889 ret
= set_kconsumerd_sockets();
2894 /* Setup kernel tracer */
2895 init_kernel_tracer();
2897 /* Set ulimit for open files */
2901 if ((ret
= set_signal_handler()) < 0) {
2905 /* Setup the needed unix socket */
2906 if ((ret
= init_daemon_socket()) < 0) {
2910 /* Set credentials to socket */
2911 if (is_root
&& ((ret
= set_permissions()) < 0)) {
2915 /* Get parent pid if -S, --sig-parent is specified. */
2916 if (opt_sig_parent
) {
2920 /* Setup the kernel pipe for waking up the kernel thread */
2921 if ((ret
= create_kernel_poll_pipe()) < 0) {
2926 * Get session list pointer. This pointer MUST NOT be free().
2927 * This list is statically declared in session.c
2929 session_list_ptr
= get_session_list();
2931 /* Create thread to manage the client socket */
2932 ret
= pthread_create(&client_thread
, NULL
, thread_manage_clients
, (void *) NULL
);
2934 perror("pthread_create");
2938 /* Create thread to manage application socket */
2939 ret
= pthread_create(&apps_thread
, NULL
, thread_manage_apps
, (void *) NULL
);
2941 perror("pthread_create");
2945 /* Create kernel thread to manage kernel event */
2946 ret
= pthread_create(&kernel_thread
, NULL
, thread_manage_kernel
, (void *) NULL
);
2948 perror("pthread_create");
2952 ret
= pthread_join(kernel_thread
, &status
);
2954 perror("pthread_join");
2955 goto error
; /* join error, exit without cleanup */
2959 ret
= pthread_join(apps_thread
, &status
);
2961 perror("pthread_join");
2962 goto error
; /* join error, exit without cleanup */
2966 ret
= pthread_join(client_thread
, &status
);
2968 perror("pthread_join");
2969 goto error
; /* join error, exit without cleanup */
2972 ret
= join_kconsumerd_thread();
2974 perror("join_kconsumerd");
2975 goto error
; /* join error, exit without cleanup */
2981 * cleanup() is called when no other thread is running.