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>
33 #include <sys/mount.h>
35 #include <sys/socket.h>
37 #include <sys/types.h>
39 #include <sys/resource.h>
42 #include <urcu/list.h> /* URCU list library (-lurcu) */
43 #include <lttng/lttng.h>
44 #include <lttng/lttng-kconsumerd.h>
45 #include <lttng-sessiond-comm.h>
48 #include "ltt-sessiond.h"
50 #include "kernel-ctl.h"
53 #include "traceable-app.h"
54 #include "ltt-kconsumerd.h"
58 const char default_home_dir
[] = DEFAULT_HOME_DIR
;
59 const char default_tracing_group
[] = LTTNG_DEFAULT_TRACING_GROUP
;
60 const char default_ust_sock_dir
[] = DEFAULT_UST_SOCK_DIR
;
61 const char default_global_apps_pipe
[] = DEFAULT_GLOBAL_APPS_PIPE
;
64 int opt_verbose
; /* Not static for lttngerr.h */
65 int opt_verbose_kconsumerd
; /* Not static for lttngerr.h */
66 int opt_quiet
; /* Not static for lttngerr.h */
69 const char *opt_tracing_group
;
70 static int opt_sig_parent
;
71 static int opt_daemon
;
72 static int is_root
; /* Set to 1 if the daemon is running as root */
73 static pid_t ppid
; /* Parent PID for --sig-parent option */
74 static pid_t kconsumerd_pid
;
75 static struct pollfd
*kernel_pollfd
;
77 static char apps_unix_sock_path
[PATH_MAX
]; /* Global application Unix socket path */
78 static char client_unix_sock_path
[PATH_MAX
]; /* Global client Unix socket path */
79 static char kconsumerd_err_unix_sock_path
[PATH_MAX
]; /* kconsumerd error Unix socket path */
80 static char kconsumerd_cmd_unix_sock_path
[PATH_MAX
]; /* kconsumerd command Unix socket path */
83 static int client_sock
;
85 static int kconsumerd_err_sock
;
86 static int kconsumerd_cmd_sock
;
87 static int kernel_tracer_fd
;
88 static int kernel_poll_pipe
[2];
91 * Quit pipe for all threads. This permits a single cancellation point
92 * for all threads when receiving an event on the pipe.
94 static int thread_quit_pipe
[2];
96 /* Pthread, Mutexes and Semaphores */
97 static pthread_t kconsumerd_thread
;
98 static pthread_t apps_thread
;
99 static pthread_t client_thread
;
100 static pthread_t kernel_thread
;
101 static sem_t kconsumerd_sem
;
103 static pthread_mutex_t kconsumerd_pid_mutex
; /* Mutex to control kconsumerd pid assignation */
105 static int modprobe_remove_kernel_modules(void);
108 * Pointer initialized before thread creation.
110 * This points to the tracing session list containing the session count and a
111 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
112 * MUST NOT be taken if you call a public function in session.c.
114 * The lock is nested inside the structure: session_list_ptr->lock. Please use
115 * lock_session_list and unlock_session_list for lock acquisition.
117 static struct ltt_session_list
*session_list_ptr
;
119 static gid_t
allowed_group(void)
123 if (opt_tracing_group
) {
124 grp
= getgrnam(opt_tracing_group
);
126 grp
= getgrnam(default_tracing_group
);
138 * Return -1 on error or 0 if all pipes are created.
140 static int init_thread_quit_pipe(void)
144 ret
= pipe2(thread_quit_pipe
, O_CLOEXEC
);
146 perror("thread quit pipe");
155 * Complete teardown of a kernel session. This free all data structure related
156 * to a kernel session and update counter.
158 static void teardown_kernel_session(struct ltt_session
*session
)
160 if (session
->kernel_session
!= NULL
) {
161 DBG("Tearing down kernel session");
164 * If a custom kernel consumer was registered, close the socket before
165 * tearing down the complete kernel session structure
167 if (session
->kernel_session
->consumer_fd
!= kconsumerd_cmd_sock
) {
168 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
171 trace_destroy_kernel_session(session
->kernel_session
);
172 /* Extra precaution */
173 session
->kernel_session
= NULL
;
177 static void stop_threads(void)
179 /* Stopping all threads */
180 DBG("Terminating all threads");
181 close(thread_quit_pipe
[0]);
182 close(thread_quit_pipe
[1]);
188 static void cleanup(void)
192 struct ltt_session
*sess
, *stmp
;
197 MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm"
198 "Matthew, BEET driven development works!%c[%dm",
199 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
202 DBG("Removing %s directory", LTTNG_RUNDIR
);
203 ret
= asprintf(&cmd
, "rm -rf " LTTNG_RUNDIR
);
205 ERR("asprintf failed. Something is really wrong!");
208 /* Remove lttng run directory */
211 ERR("Unable to clean " LTTNG_RUNDIR
);
214 DBG("Cleaning up all session");
216 /* Destroy session list mutex */
217 if (session_list_ptr
!= NULL
) {
218 pthread_mutex_destroy(&session_list_ptr
->lock
);
220 /* Cleanup ALL session */
221 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
222 teardown_kernel_session(sess
);
223 // TODO complete session cleanup (including UST)
227 pthread_mutex_destroy(&kconsumerd_pid_mutex
);
229 DBG("Closing kernel fd");
230 close(kernel_tracer_fd
);
232 DBG("Unloading kernel modules");
233 modprobe_remove_kernel_modules();
237 * Send data on a unix socket using the liblttsessiondcomm API.
239 * Return lttcomm error code.
241 static int send_unix_sock(int sock
, void *buf
, size_t len
)
243 /* Check valid length */
248 return lttcomm_send_unix_sock(sock
, buf
, len
);
252 * Free memory of a command context structure.
254 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
256 DBG("Clean command context structure");
258 if ((*cmd_ctx
)->llm
) {
259 free((*cmd_ctx
)->llm
);
261 if ((*cmd_ctx
)->lsm
) {
262 free((*cmd_ctx
)->lsm
);
270 * Send all stream fds of kernel channel to the consumer.
272 static int send_kconsumerd_channel_fds(int sock
, struct ltt_kernel_channel
*channel
)
276 struct ltt_kernel_stream
*stream
;
277 struct lttcomm_kconsumerd_header lkh
;
278 struct lttcomm_kconsumerd_msg lkm
;
280 DBG("Sending fds of channel %s to kernel consumer", channel
->channel
->name
);
282 nb_fd
= channel
->stream_count
;
285 lkh
.payload_size
= nb_fd
* sizeof(struct lttcomm_kconsumerd_msg
);
286 lkh
.cmd_type
= ADD_STREAM
;
288 DBG("Sending kconsumerd header");
290 ret
= lttcomm_send_unix_sock(sock
, &lkh
, sizeof(struct lttcomm_kconsumerd_header
));
292 perror("send kconsumerd header");
296 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
297 if (stream
->fd
!= 0) {
299 lkm
.state
= stream
->state
;
300 lkm
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
301 lkm
.output
= channel
->channel
->attr
.output
;
302 strncpy(lkm
.path_name
, stream
->pathname
, PATH_MAX
);
303 lkm
.path_name
[PATH_MAX
- 1] = '\0';
305 DBG("Sending fd %d to kconsumerd", lkm
.fd
);
307 ret
= lttcomm_send_fds_unix_sock(sock
, &lkm
, &lkm
.fd
, 1, sizeof(lkm
));
309 perror("send kconsumerd fd");
315 DBG("Kconsumerd channel fds sent");
324 * Send all stream fds of the kernel session to the consumer.
326 static int send_kconsumerd_fds(struct ltt_kernel_session
*session
)
329 struct ltt_kernel_channel
*chan
;
330 struct lttcomm_kconsumerd_header lkh
;
331 struct lttcomm_kconsumerd_msg lkm
;
334 lkh
.payload_size
= sizeof(struct lttcomm_kconsumerd_msg
);
335 lkh
.cmd_type
= ADD_STREAM
;
337 DBG("Sending kconsumerd header for metadata");
339 ret
= lttcomm_send_unix_sock(session
->consumer_fd
, &lkh
, sizeof(struct lttcomm_kconsumerd_header
));
341 perror("send kconsumerd header");
345 DBG("Sending metadata stream fd");
347 /* Extra protection. It's NOT suppose to be set to 0 at this point */
348 if (session
->consumer_fd
== 0) {
349 session
->consumer_fd
= kconsumerd_cmd_sock
;
352 if (session
->metadata_stream_fd
!= 0) {
353 /* Send metadata stream fd first */
354 lkm
.fd
= session
->metadata_stream_fd
;
355 lkm
.state
= ACTIVE_FD
;
356 lkm
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
357 lkm
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
358 strncpy(lkm
.path_name
, session
->metadata
->pathname
, PATH_MAX
);
359 lkm
.path_name
[PATH_MAX
- 1] = '\0';
361 ret
= lttcomm_send_fds_unix_sock(session
->consumer_fd
, &lkm
, &lkm
.fd
, 1, sizeof(lkm
));
363 perror("send kconsumerd fd");
368 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
369 ret
= send_kconsumerd_channel_fds(session
->consumer_fd
, chan
);
375 DBG("Kconsumerd fds (metadata and channel streams) sent");
385 * Return a socket connected to the libust communication socket of the
386 * application identified by the pid.
388 * If the pid is not found in the traceable list, return -1 to indicate error.
390 static int ust_connect_app(pid_t pid
)
393 struct ltt_traceable_app
*lta
;
395 DBG("Connect to application pid %d", pid
);
397 lta
= find_app_by_pid(pid
);
400 DBG("Application pid %d not found", pid
);
404 sock
= ustctl_connect_pid(lta
->pid
);
406 ERR("Fail connecting to the PID %d", pid
);
411 #endif /* DISABLED */
414 * Notify apps by writing 42 to a named pipe using name. Every applications
415 * waiting for a ltt-sessiond will be notified and re-register automatically to
416 * the session daemon.
418 * Return open or write error value.
420 static int notify_apps(const char *name
)
425 DBG("Notify the global application pipe");
427 /* Try opening the global pipe */
428 fd
= open(name
, O_WRONLY
);
433 /* Notify by writing on the pipe */
434 ret
= write(fd
, "42", 2);
444 * Setup the outgoing data buffer for the response (llm) by allocating the
445 * right amount of memory and copying the original information from the lsm
448 * Return total size of the buffer pointed by buf.
450 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
456 cmd_ctx
->llm
= malloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
457 if (cmd_ctx
->llm
== NULL
) {
463 /* Copy common data */
464 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
465 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
467 cmd_ctx
->llm
->data_size
= size
;
468 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
477 * Update the kernel pollfd set of all channel fd available over all tracing
478 * session. Add the wakeup pipe at the end of the set.
480 static int update_kernel_pollfd(void)
484 * The wakup pipe and the quit pipe are needed so the number of fds starts
485 * at 2 for those pipes.
487 unsigned int nb_fd
= 2;
488 struct ltt_session
*session
;
489 struct ltt_kernel_channel
*channel
;
491 DBG("Updating kernel_pollfd");
493 /* Get the number of channel of all kernel session */
495 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
496 lock_session(session
);
497 if (session
->kernel_session
== NULL
) {
498 unlock_session(session
);
501 nb_fd
+= session
->kernel_session
->channel_count
;
502 unlock_session(session
);
505 DBG("Resizing kernel_pollfd to size %d", nb_fd
);
507 kernel_pollfd
= realloc(kernel_pollfd
, nb_fd
* sizeof(struct pollfd
));
508 if (kernel_pollfd
== NULL
) {
509 perror("malloc kernel_pollfd");
513 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
514 lock_session(session
);
515 if (session
->kernel_session
== NULL
) {
516 unlock_session(session
);
520 ERR("To much channel for kernel_pollfd size");
521 unlock_session(session
);
524 cds_list_for_each_entry(channel
, &session
->kernel_session
->channel_list
.head
, list
) {
525 kernel_pollfd
[i
].fd
= channel
->fd
;
526 kernel_pollfd
[i
].events
= POLLIN
| POLLRDNORM
;
529 unlock_session(session
);
531 unlock_session_list();
533 /* Adding wake up pipe */
534 kernel_pollfd
[nb_fd
- 2].fd
= kernel_poll_pipe
[0];
535 kernel_pollfd
[nb_fd
- 2].events
= POLLIN
;
537 /* Adding the quit pipe */
538 kernel_pollfd
[nb_fd
- 1].fd
= thread_quit_pipe
[0];
543 unlock_session_list();
548 * Find the channel fd from 'fd' over all tracing session. When found, check
549 * for new channel stream and send those stream fds to the kernel consumer.
551 * Useful for CPU hotplug feature.
553 static int update_kernel_stream(int fd
)
556 struct ltt_session
*session
;
557 struct ltt_kernel_channel
*channel
;
559 DBG("Updating kernel streams for channel fd %d", fd
);
562 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
563 lock_session(session
);
564 if (session
->kernel_session
== NULL
) {
565 unlock_session(session
);
569 /* This is not suppose to be 0 but this is an extra security check */
570 if (session
->kernel_session
->consumer_fd
== 0) {
571 session
->kernel_session
->consumer_fd
= kconsumerd_cmd_sock
;
574 cds_list_for_each_entry(channel
, &session
->kernel_session
->channel_list
.head
, list
) {
575 if (channel
->fd
== fd
) {
576 DBG("Channel found, updating kernel streams");
577 ret
= kernel_open_channel_stream(channel
);
583 * Have we already sent fds to the consumer? If yes, it means that
584 * tracing is started so it is safe to send our updated stream fds.
586 if (session
->kernel_session
->kconsumer_fds_sent
== 1) {
587 ret
= send_kconsumerd_channel_fds(session
->kernel_session
->consumer_fd
,
596 unlock_session(session
);
600 unlock_session_list();
602 unlock_session(session
);
608 * This thread manage event coming from the kernel.
610 * Features supported in this thread:
613 static void *thread_manage_kernel(void *data
)
615 int ret
, i
, nb_fd
= 0;
617 int update_poll_flag
= 1;
619 DBG("Thread manage kernel started");
622 if (update_poll_flag
== 1) {
623 nb_fd
= update_kernel_pollfd();
627 update_poll_flag
= 0;
630 DBG("Polling on %d fds", nb_fd
);
632 /* Poll infinite value of time */
633 ret
= poll(kernel_pollfd
, nb_fd
, -1);
635 perror("poll kernel thread");
637 } else if (ret
== 0) {
638 /* Should not happen since timeout is infinite */
642 /* Thread quit pipe has been closed. Killing thread. */
643 if (kernel_pollfd
[nb_fd
- 1].revents
== POLLNVAL
) {
647 DBG("Kernel poll event triggered");
650 * Check if the wake up pipe was triggered. If so, the kernel_pollfd
653 switch (kernel_pollfd
[nb_fd
- 2].revents
) {
655 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
656 update_poll_flag
= 1;
664 for (i
= 0; i
< nb_fd
; i
++) {
665 switch (kernel_pollfd
[i
].revents
) {
667 * New CPU detected by the kernel. Adding kernel stream to kernel
668 * session and updating the kernel consumer
670 case POLLIN
| POLLRDNORM
:
671 ret
= update_kernel_stream(kernel_pollfd
[i
].fd
);
681 DBG("Kernel thread dying");
686 close(kernel_poll_pipe
[0]);
687 close(kernel_poll_pipe
[1]);
692 * This thread manage the kconsumerd error sent back to the session daemon.
694 static void *thread_manage_kconsumerd(void *data
)
697 enum lttcomm_return_code code
;
698 struct pollfd pollfd
[2];
700 DBG("[thread] Manage kconsumerd started");
702 ret
= lttcomm_listen_unix_sock(kconsumerd_err_sock
);
707 /* First fd is always the quit pipe */
708 pollfd
[0].fd
= thread_quit_pipe
[0];
711 pollfd
[1].fd
= kconsumerd_err_sock
;
712 pollfd
[1].events
= POLLIN
;
714 /* Inifinite blocking call, waiting for transmission */
715 ret
= poll(pollfd
, 2, -1);
717 perror("poll kconsumerd thread");
721 /* Thread quit pipe has been closed. Killing thread. */
722 if (pollfd
[0].revents
== POLLNVAL
) {
724 } else if (pollfd
[1].revents
== POLLERR
) {
725 ERR("Kconsumerd err socket poll error");
729 sock
= lttcomm_accept_unix_sock(kconsumerd_err_sock
);
734 /* Getting status code from kconsumerd */
735 ret
= lttcomm_recv_unix_sock(sock
, &code
, sizeof(enum lttcomm_return_code
));
740 if (code
== KCONSUMERD_COMMAND_SOCK_READY
) {
741 kconsumerd_cmd_sock
= lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path
);
742 if (kconsumerd_cmd_sock
< 0) {
743 sem_post(&kconsumerd_sem
);
744 perror("kconsumerd connect");
747 /* Signal condition to tell that the kconsumerd is ready */
748 sem_post(&kconsumerd_sem
);
749 DBG("Kconsumerd command socket ready");
751 DBG("Kconsumerd error when waiting for SOCK_READY : %s",
752 lttcomm_get_readable_code(-code
));
756 /* Wait for any kconsumerd error */
757 ret
= lttcomm_recv_unix_sock(sock
, &code
, sizeof(enum lttcomm_return_code
));
759 ERR("Kconsumerd closed the command socket");
763 ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code
));
766 DBG("Kconsumerd thread dying");
767 if (kconsumerd_err_sock
) {
768 close(kconsumerd_err_sock
);
770 if (kconsumerd_cmd_sock
) {
771 close(kconsumerd_cmd_sock
);
777 unlink(kconsumerd_err_unix_sock_path
);
778 unlink(kconsumerd_cmd_unix_sock_path
);
785 * This thread manage the application socket communication
787 static void *thread_manage_apps(void *data
)
790 struct pollfd pollfd
[2];
792 /* TODO: Something more elegant is needed but fine for now */
793 /* FIXME: change all types to either uint8_t, uint32_t, uint64_t
794 * for 32-bit vs 64-bit compat processes. */
795 /* replicate in ust with version number */
797 int reg
; /* 1:register, 0:unregister */
802 DBG("[thread] Manage apps started");
804 ret
= lttcomm_listen_unix_sock(apps_sock
);
809 /* First fd is always the quit pipe */
810 pollfd
[0].fd
= thread_quit_pipe
[0];
813 pollfd
[1].fd
= apps_sock
;
814 pollfd
[1].events
= POLLIN
;
816 /* Notify all applications to register */
817 notify_apps(default_global_apps_pipe
);
820 DBG("Accepting application registration");
822 /* Inifinite blocking call, waiting for transmission */
823 ret
= poll(pollfd
, 2, -1);
825 perror("poll apps thread");
829 /* Thread quit pipe has been closed. Killing thread. */
830 if (pollfd
[0].revents
== POLLNVAL
) {
832 } else if (pollfd
[1].revents
== POLLERR
) {
833 ERR("Apps socket poll error");
837 sock
= lttcomm_accept_unix_sock(apps_sock
);
843 * Basic recv here to handle the very simple data
844 * that the libust send to register (reg_msg).
846 ret
= recv(sock
, ®_msg
, sizeof(reg_msg
), 0);
852 /* Add application to the global traceable list */
853 if (reg_msg
.reg
== 1) {
855 ret
= register_traceable_app(reg_msg
.pid
, reg_msg
.uid
);
857 /* register_traceable_app only return an error with
858 * ENOMEM. At this point, we better stop everything.
864 unregister_traceable_app(reg_msg
.pid
);
869 DBG("Apps thread dying");
877 unlink(apps_unix_sock_path
);
882 * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
883 * exec or it will fails.
885 static int spawn_kconsumerd_thread(void)
889 /* Setup semaphore */
890 sem_init(&kconsumerd_sem
, 0, 0);
892 ret
= pthread_create(&kconsumerd_thread
, NULL
, thread_manage_kconsumerd
, (void *) NULL
);
894 perror("pthread_create kconsumerd");
898 /* Wait for the kconsumerd thread to be ready */
899 sem_wait(&kconsumerd_sem
);
901 if (kconsumerd_pid
== 0) {
902 ERR("Kconsumerd did not start");
909 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
914 * Join kernel consumer thread
916 static int join_kconsumerd_thread(void)
921 if (kconsumerd_pid
!= 0) {
922 ret
= kill(kconsumerd_pid
, SIGTERM
);
924 ERR("Error killing kconsumerd");
927 return pthread_join(kconsumerd_thread
, &status
);
934 * Fork and exec a kernel consumer daemon (kconsumerd).
936 * Return pid if successful else -1.
938 static pid_t
spawn_kconsumerd(void)
942 const char *verbosity
;
944 DBG("Spawning kconsumerd");
951 if (opt_verbose
> 1 || opt_verbose_kconsumerd
) {
952 verbosity
= "--verbose";
954 verbosity
= "--quiet";
956 execl(INSTALL_BIN_PATH
"/ltt-kconsumerd", "ltt-kconsumerd", verbosity
, NULL
);
958 perror("kernel start consumer exec");
961 } else if (pid
> 0) {
965 perror("kernel start consumer fork");
975 * Spawn the kconsumerd daemon and session daemon thread.
977 static int start_kconsumerd(void)
981 pthread_mutex_lock(&kconsumerd_pid_mutex
);
982 if (kconsumerd_pid
!= 0) {
983 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
987 ret
= spawn_kconsumerd();
989 ERR("Spawning kconsumerd failed");
990 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
991 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
995 /* Setting up the global kconsumerd_pid */
996 kconsumerd_pid
= ret
;
997 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
999 DBG("Kconsumerd pid %d", ret
);
1001 DBG("Spawning kconsumerd thread");
1002 ret
= spawn_kconsumerd_thread();
1004 ERR("Fatal error spawning kconsumerd thread");
1016 * modprobe_kernel_modules
1018 static int modprobe_kernel_modules(void)
1023 for (i
= 0; i
< ARRAY_SIZE(kernel_modules_list
); i
++) {
1024 ret
= snprintf(modprobe
, sizeof(modprobe
),
1025 "/sbin/modprobe %s%s",
1026 kernel_modules_list
[i
].required
? "" : "--quiet ",
1027 kernel_modules_list
[i
].name
);
1029 perror("snprintf modprobe");
1032 modprobe
[sizeof(modprobe
) - 1] = '\0';
1033 ret
= system(modprobe
);
1035 ERR("Unable to launch modprobe for module %s",
1036 kernel_modules_list
[i
].name
);
1037 } else if (kernel_modules_list
[i
].required
1038 && WEXITSTATUS(ret
) != 0) {
1039 ERR("Unable to load module %s",
1040 kernel_modules_list
[i
].name
);
1042 DBG("Modprobe successfully %s",
1043 kernel_modules_list
[i
].name
);
1052 * modprobe_remove_kernel_modules
1053 * Remove modules in reverse load order.
1055 static int modprobe_remove_kernel_modules(void)
1060 for (i
= ARRAY_SIZE(kernel_modules_list
) - 1; i
>= 0; i
--) {
1061 ret
= snprintf(modprobe
, sizeof(modprobe
),
1062 "/sbin/modprobe --remove --quiet %s",
1063 kernel_modules_list
[i
].name
);
1065 perror("snprintf modprobe --remove");
1068 modprobe
[sizeof(modprobe
) - 1] = '\0';
1069 ret
= system(modprobe
);
1071 ERR("Unable to launch modprobe --remove for module %s",
1072 kernel_modules_list
[i
].name
);
1073 } else if (kernel_modules_list
[i
].required
1074 && WEXITSTATUS(ret
) != 0) {
1075 ERR("Unable to remove module %s",
1076 kernel_modules_list
[i
].name
);
1078 DBG("Modprobe removal successful %s",
1079 kernel_modules_list
[i
].name
);
1090 static int mount_debugfs(char *path
)
1093 char *type
= "debugfs";
1095 ret
= mkdir_recursive(path
, S_IRWXU
| S_IRWXG
, geteuid(), getegid());
1100 ret
= mount(type
, path
, type
, 0, NULL
);
1102 perror("mount debugfs");
1106 DBG("Mounted debugfs successfully at %s", path
);
1113 * Setup necessary data for kernel tracer action.
1115 static void init_kernel_tracer(void)
1118 char *proc_mounts
= "/proc/mounts";
1120 char *debugfs_path
= NULL
, *lttng_path
;
1123 /* Detect debugfs */
1124 fp
= fopen(proc_mounts
, "r");
1126 ERR("Unable to probe %s", proc_mounts
);
1130 while (fgets(line
, sizeof(line
), fp
) != NULL
) {
1131 if (strstr(line
, "debugfs") != NULL
) {
1132 /* Remove first string */
1134 /* Dup string here so we can reuse line later on */
1135 debugfs_path
= strdup(strtok(NULL
, " "));
1136 DBG("Got debugfs path : %s", debugfs_path
);
1143 /* Mount debugfs if needded */
1144 if (debugfs_path
== NULL
) {
1145 ret
= asprintf(&debugfs_path
, "/mnt/debugfs");
1147 perror("asprintf debugfs path");
1150 ret
= mount_debugfs(debugfs_path
);
1156 /* Modprobe lttng kernel modules */
1157 ret
= modprobe_kernel_modules();
1162 /* Setup lttng kernel path */
1163 ret
= asprintf(<tng_path
, "%s/lttng", debugfs_path
);
1165 perror("asprintf lttng path");
1169 /* Open debugfs lttng */
1170 kernel_tracer_fd
= open(lttng_path
, O_RDWR
);
1171 if (kernel_tracer_fd
< 0) {
1172 DBG("Failed to open %s", lttng_path
);
1178 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1188 WARN("No kernel tracer available");
1189 kernel_tracer_fd
= 0;
1194 * Start tracing by creating trace directory and sending FDs to the kernel
1197 static int start_kernel_trace(struct ltt_kernel_session
*session
)
1201 if (session
->kconsumer_fds_sent
== 0) {
1203 * Assign default kernel consumer if no consumer assigned to the kernel
1204 * session. At this point, it's NOT suppose to be 0 but this is an extra
1207 if (session
->consumer_fd
== 0) {
1208 session
->consumer_fd
= kconsumerd_cmd_sock
;
1211 ret
= send_kconsumerd_fds(session
);
1213 ERR("Send kconsumerd fds failed");
1214 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1218 session
->kconsumer_fds_sent
= 1;
1226 * Notify kernel thread to update it's pollfd.
1228 static int notify_kernel_pollfd(void)
1232 /* Inform kernel thread of the new kernel channel */
1233 ret
= write(kernel_poll_pipe
[1], "!", 1);
1235 perror("write kernel poll pipe");
1242 * Allocate a channel structure and fill it.
1244 static struct lttng_channel
*init_default_channel(enum lttng_domain_type domain_type
,
1247 struct lttng_channel
*chan
;
1249 chan
= malloc(sizeof(struct lttng_channel
));
1251 perror("init channel malloc");
1255 if (snprintf(chan
->name
, NAME_MAX
, "%s", name
) < 0) {
1256 perror("snprintf channel name");
1260 chan
->attr
.overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
1261 chan
->attr
.switch_timer_interval
= DEFAULT_CHANNEL_SWITCH_TIMER
;
1262 chan
->attr
.read_timer_interval
= DEFAULT_CHANNEL_READ_TIMER
;
1264 switch (domain_type
) {
1265 case LTTNG_DOMAIN_KERNEL
:
1266 chan
->attr
.subbuf_size
= DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE
;
1267 chan
->attr
.num_subbuf
= DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
;
1268 chan
->attr
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
1272 goto error
; /* Not implemented */
1283 * Create a kernel tracer session then create the default channel.
1285 static int create_kernel_session(struct ltt_session
*session
)
1289 DBG("Creating kernel session");
1291 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1293 ret
= LTTCOMM_KERN_SESS_FAIL
;
1297 /* Set kernel consumer socket fd */
1298 if (kconsumerd_cmd_sock
) {
1299 session
->kernel_session
->consumer_fd
= kconsumerd_cmd_sock
;
1302 ret
= asprintf(&session
->kernel_session
->trace_path
, "%s/kernel",
1305 perror("asprintf kernel traces path");
1309 ret
= mkdir_recursive(session
->kernel_session
->trace_path
,
1310 S_IRWXU
| S_IRWXG
, geteuid(), allowed_group());
1312 if (ret
!= -EEXIST
) {
1313 ERR("Trace directory creation error");
1323 * Using the session list, filled a lttng_session array to send back to the
1324 * client for session listing.
1326 * The session list lock MUST be acquired before calling this function. Use
1327 * lock_session_list() and unlock_session_list().
1329 static void list_lttng_sessions(struct lttng_session
*sessions
)
1332 struct ltt_session
*session
;
1334 DBG("Getting all available session");
1336 * Iterate over session list and append data after the control struct in
1339 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1340 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
1341 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
1342 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
1343 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
1349 * Fill lttng_channel array of all channels.
1351 static void list_lttng_channels(struct ltt_session
*session
,
1352 struct lttng_channel
*channels
)
1355 struct ltt_kernel_channel
*kchan
;
1357 DBG("Listing channels for session %s", session
->name
);
1359 /* Kernel channels */
1360 if (session
->kernel_session
!= NULL
) {
1361 cds_list_for_each_entry(kchan
, &session
->kernel_session
->channel_list
.head
, list
) {
1362 /* Copy lttng_channel struct to array */
1363 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
1364 channels
[i
].enabled
= kchan
->enabled
;
1369 /* TODO: Missing UST listing */
1373 * Fill lttng_event array of all events in the channel.
1375 static void list_lttng_events(struct ltt_kernel_channel
*kchan
,
1376 struct lttng_event
*events
)
1379 * TODO: This is ONLY kernel. Need UST support.
1382 struct ltt_kernel_event
*event
;
1384 DBG("Listing events for channel %s", kchan
->channel
->name
);
1386 /* Kernel channels */
1387 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
1388 strncpy(events
[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
1389 events
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1390 events
[i
].enabled
= event
->enabled
;
1391 switch (event
->event
->instrumentation
) {
1392 case LTTNG_KERNEL_TRACEPOINT
:
1393 events
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1395 case LTTNG_KERNEL_KPROBE
:
1396 case LTTNG_KERNEL_KRETPROBE
:
1397 events
[i
].type
= LTTNG_EVENT_PROBE
;
1398 memcpy(&events
[i
].attr
.probe
, &event
->event
->u
.kprobe
,
1399 sizeof(struct lttng_kernel_kprobe
));
1401 case LTTNG_KERNEL_FUNCTION
:
1402 events
[i
].type
= LTTNG_EVENT_FUNCTION
;
1403 memcpy(&events
[i
].attr
.ftrace
, &event
->event
->u
.ftrace
,
1404 sizeof(struct lttng_kernel_function
));
1412 * Process the command requested by the lttng client within the command
1413 * context structure. This function make sure that the return structure (llm)
1414 * is set and ready for transmission before returning.
1416 * Return any error encountered or 0 for success.
1418 static int process_client_msg(struct command_ctx
*cmd_ctx
)
1420 int ret
= LTTCOMM_OK
;
1422 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
1425 * Commands that DO NOT need a session.
1427 switch (cmd_ctx
->lsm
->cmd_type
) {
1428 case LTTNG_CREATE_SESSION
:
1429 case LTTNG_LIST_SESSIONS
:
1430 case LTTNG_LIST_TRACEPOINTS
:
1431 case LTTNG_CALIBRATE
:
1434 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
1435 cmd_ctx
->session
= find_session_by_name(cmd_ctx
->lsm
->session
.name
);
1436 if (cmd_ctx
->session
== NULL
) {
1437 /* If session name not found */
1438 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
1439 ret
= LTTCOMM_SESS_NOT_FOUND
;
1440 } else { /* If no session name specified */
1441 ret
= LTTCOMM_SELECT_SESS
;
1445 /* Acquire lock for the session */
1446 lock_session(cmd_ctx
->session
);
1452 * Check domain type for specific "pre-action".
1454 switch (cmd_ctx
->lsm
->domain
.type
) {
1455 case LTTNG_DOMAIN_KERNEL
:
1456 /* Kernel tracer check */
1457 if (kernel_tracer_fd
== 0) {
1458 init_kernel_tracer();
1459 if (kernel_tracer_fd
== 0) {
1460 ret
= LTTCOMM_KERN_NA
;
1465 /* Need a session for kernel command */
1466 switch (cmd_ctx
->lsm
->cmd_type
) {
1467 case LTTNG_CALIBRATE
:
1468 case LTTNG_CREATE_SESSION
:
1469 case LTTNG_LIST_SESSIONS
:
1470 case LTTNG_LIST_TRACEPOINTS
:
1473 if (cmd_ctx
->session
->kernel_session
== NULL
) {
1474 ret
= create_kernel_session(cmd_ctx
->session
);
1476 ret
= LTTCOMM_KERN_SESS_FAIL
;
1480 /* Start the kernel consumer daemon */
1482 if (kconsumerd_pid
== 0 &&
1483 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
1484 ret
= start_kconsumerd();
1496 /* Process by command type */
1497 switch (cmd_ctx
->lsm
->cmd_type
) {
1498 case LTTNG_ADD_CONTEXT
:
1500 struct lttng_kernel_context kctx
;
1502 /* Setup lttng message with no payload */
1503 ret
= setup_lttng_msg(cmd_ctx
, 0);
1508 switch (cmd_ctx
->lsm
->domain
.type
) {
1509 case LTTNG_DOMAIN_KERNEL
:
1510 /* Create Kernel context */
1511 kctx
.ctx
= cmd_ctx
->lsm
->u
.context
.ctx
.ctx
;
1512 kctx
.u
.perf_counter
.type
= cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.type
;
1513 kctx
.u
.perf_counter
.config
= cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.config
;
1514 strncpy(kctx
.u
.perf_counter
.name
,
1515 cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.name
,
1516 LTTNG_SYMBOL_NAME_LEN
);
1517 kctx
.u
.perf_counter
.name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1519 /* Add kernel context to kernel tracer. See context.c */
1520 ret
= add_kernel_context(cmd_ctx
->session
->kernel_session
, &kctx
,
1521 cmd_ctx
->lsm
->u
.context
.event_name
,
1522 cmd_ctx
->lsm
->u
.context
.channel_name
);
1523 if (ret
!= LTTCOMM_OK
) {
1528 /* TODO: Userspace tracing */
1529 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1536 case LTTNG_DISABLE_CHANNEL
:
1538 struct ltt_kernel_channel
*kchan
;
1540 /* Setup lttng message with no payload */
1541 ret
= setup_lttng_msg(cmd_ctx
, 0);
1546 switch (cmd_ctx
->lsm
->domain
.type
) {
1547 case LTTNG_DOMAIN_KERNEL
:
1548 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1549 cmd_ctx
->session
->kernel_session
);
1550 if (kchan
== NULL
) {
1551 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1553 } else if (kchan
->enabled
== 1) {
1554 ret
= kernel_disable_channel(kchan
);
1556 if (ret
!= EEXIST
) {
1557 ret
= LTTCOMM_KERN_CHAN_DISABLE_FAIL
;
1562 kernel_wait_quiescent(kernel_tracer_fd
);
1565 /* TODO: Userspace tracing */
1566 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1573 case LTTNG_DISABLE_EVENT
:
1575 struct ltt_kernel_channel
*kchan
;
1576 struct ltt_kernel_event
*kevent
;
1578 /* Setup lttng message with no payload */
1579 ret
= setup_lttng_msg(cmd_ctx
, 0);
1584 switch (cmd_ctx
->lsm
->domain
.type
) {
1585 case LTTNG_DOMAIN_KERNEL
:
1586 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1587 cmd_ctx
->session
->kernel_session
);
1588 if (kchan
== NULL
) {
1589 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1593 kevent
= get_kernel_event_by_name(cmd_ctx
->lsm
->u
.disable
.name
, kchan
);
1594 if (kevent
!= NULL
) {
1595 DBG("Disabling kernel event %s for channel %s.", kevent
->event
->name
,
1596 kchan
->channel
->name
);
1597 ret
= kernel_disable_event(kevent
);
1599 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
1604 kernel_wait_quiescent(kernel_tracer_fd
);
1607 /* TODO: Userspace tracing */
1608 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1615 case LTTNG_DISABLE_ALL_EVENT
:
1617 struct ltt_kernel_channel
*kchan
;
1618 struct ltt_kernel_event
*kevent
;
1620 /* Setup lttng message with no payload */
1621 ret
= setup_lttng_msg(cmd_ctx
, 0);
1626 switch (cmd_ctx
->lsm
->domain
.type
) {
1627 case LTTNG_DOMAIN_KERNEL
:
1628 DBG("Disabling all enabled kernel events");
1629 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1630 cmd_ctx
->session
->kernel_session
);
1631 if (kchan
== NULL
) {
1632 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1636 /* For each event in the kernel session */
1637 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
1638 DBG("Disabling kernel event %s for channel %s.",
1639 kevent
->event
->name
, kchan
->channel
->name
);
1640 ret
= kernel_disable_event(kevent
);
1646 /* Quiescent wait after event disable */
1647 kernel_wait_quiescent(kernel_tracer_fd
);
1650 /* TODO: Userspace tracing */
1651 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1658 case LTTNG_ENABLE_CHANNEL
:
1660 struct ltt_kernel_channel
*kchan
;
1662 /* Setup lttng message with no payload */
1663 ret
= setup_lttng_msg(cmd_ctx
, 0);
1668 switch (cmd_ctx
->lsm
->domain
.type
) {
1669 case LTTNG_DOMAIN_KERNEL
:
1670 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.enable
.channel_name
,
1671 cmd_ctx
->session
->kernel_session
);
1672 if (kchan
== NULL
) {
1673 /* Channel not found, creating it */
1674 DBG("Creating kernel channel");
1676 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1677 &cmd_ctx
->lsm
->u
.channel
.chan
,
1678 cmd_ctx
->session
->kernel_session
->trace_path
);
1680 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1684 /* Notify kernel thread that there is a new channel */
1685 ret
= notify_kernel_pollfd();
1687 ret
= LTTCOMM_FATAL
;
1690 } else if (kchan
->enabled
== 0) {
1691 ret
= kernel_enable_channel(kchan
);
1693 if (ret
!= EEXIST
) {
1694 ret
= LTTCOMM_KERN_CHAN_ENABLE_FAIL
;
1700 kernel_wait_quiescent(kernel_tracer_fd
);
1703 /* TODO: Userspace tracing */
1704 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1711 case LTTNG_ENABLE_EVENT
:
1714 struct ltt_kernel_channel
*kchan
;
1715 struct ltt_kernel_event
*kevent
;
1716 struct lttng_channel
*chan
;
1718 /* Setup lttng message with no payload */
1719 ret
= setup_lttng_msg(cmd_ctx
, 0);
1724 channel_name
= cmd_ctx
->lsm
->u
.enable
.channel_name
;
1726 switch (cmd_ctx
->lsm
->domain
.type
) {
1727 case LTTNG_DOMAIN_KERNEL
:
1728 kchan
= get_kernel_channel_by_name(channel_name
,
1729 cmd_ctx
->session
->kernel_session
);
1730 if (kchan
== NULL
) {
1731 DBG("Channel not found. Creating channel %s", channel_name
);
1733 chan
= init_default_channel(cmd_ctx
->lsm
->domain
.type
, channel_name
);
1735 ret
= LTTCOMM_FATAL
;
1739 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1740 chan
, cmd_ctx
->session
->kernel_session
->trace_path
);
1742 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1745 kchan
= get_kernel_channel_by_name(channel_name
,
1746 cmd_ctx
->session
->kernel_session
);
1747 if (kchan
== NULL
) {
1748 ERR("Channel %s not found after creation. Internal error, giving up.",
1750 ret
= LTTCOMM_FATAL
;
1755 kevent
= get_kernel_event_by_name(cmd_ctx
->lsm
->u
.enable
.event
.name
, kchan
);
1756 if (kevent
== NULL
) {
1757 DBG("Creating kernel event %s for channel %s.",
1758 cmd_ctx
->lsm
->u
.enable
.event
.name
, channel_name
);
1759 ret
= kernel_create_event(&cmd_ctx
->lsm
->u
.enable
.event
, kchan
);
1761 DBG("Enabling kernel event %s for channel %s.",
1762 kevent
->event
->name
, channel_name
);
1763 ret
= kernel_enable_event(kevent
);
1764 if (ret
== -EEXIST
) {
1765 ret
= LTTCOMM_KERN_EVENT_EXIST
;
1771 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
1775 kernel_wait_quiescent(kernel_tracer_fd
);
1778 /* TODO: Userspace tracing */
1779 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1785 case LTTNG_ENABLE_ALL_EVENT
:
1789 struct ltt_kernel_channel
*kchan
;
1790 struct ltt_kernel_event
*kevent
;
1791 struct lttng_event
*event_list
;
1792 struct lttng_channel
*chan
;
1794 /* Setup lttng message with no payload */
1795 ret
= setup_lttng_msg(cmd_ctx
, 0);
1800 DBG("Enabling all kernel event");
1802 channel_name
= cmd_ctx
->lsm
->u
.enable
.channel_name
;
1804 switch (cmd_ctx
->lsm
->domain
.type
) {
1805 case LTTNG_DOMAIN_KERNEL
:
1806 kchan
= get_kernel_channel_by_name(channel_name
,
1807 cmd_ctx
->session
->kernel_session
);
1808 if (kchan
== NULL
) {
1809 DBG("Channel not found. Creating channel %s", channel_name
);
1811 chan
= init_default_channel(cmd_ctx
->lsm
->domain
.type
, channel_name
);
1813 ret
= LTTCOMM_FATAL
;
1817 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1818 chan
, cmd_ctx
->session
->kernel_session
->trace_path
);
1820 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1823 kchan
= get_kernel_channel_by_name(channel_name
,
1824 cmd_ctx
->session
->kernel_session
);
1825 if (kchan
== NULL
) {
1826 ERR("Channel %s not found after creation. Internal error, giving up.",
1828 ret
= LTTCOMM_FATAL
;
1833 /* For each event in the kernel session */
1834 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
1835 DBG("Enabling kernel event %s for channel %s.",
1836 kevent
->event
->name
, channel_name
);
1837 ret
= kernel_enable_event(kevent
);
1843 size
= kernel_list_events(kernel_tracer_fd
, &event_list
);
1845 ret
= LTTCOMM_KERN_LIST_FAIL
;
1849 for (i
= 0; i
< size
; i
++) {
1850 kevent
= get_kernel_event_by_name(event_list
[i
].name
, kchan
);
1851 if (kevent
== NULL
) {
1852 /* Default event type for enable all */
1853 event_list
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1854 /* Enable each single tracepoint event */
1855 ret
= kernel_create_event(&event_list
[i
], kchan
);
1857 /* Ignore error here and continue */
1864 /* Quiescent wait after event enable */
1865 kernel_wait_quiescent(kernel_tracer_fd
);
1868 /* TODO: Userspace tracing */
1869 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1876 case LTTNG_LIST_TRACEPOINTS
:
1878 struct lttng_event
*events
;
1879 ssize_t nb_events
= 0;
1881 switch (cmd_ctx
->lsm
->domain
.type
) {
1882 case LTTNG_DOMAIN_KERNEL
:
1883 DBG("Listing kernel events");
1884 nb_events
= kernel_list_events(kernel_tracer_fd
, &events
);
1885 if (nb_events
< 0) {
1886 ret
= LTTCOMM_KERN_LIST_FAIL
;
1891 /* TODO: Userspace listing */
1892 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1897 * Setup lttng message with payload size set to the event list size in
1898 * bytes and then copy list into the llm payload.
1900 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
1906 /* Copy event list into message payload */
1907 memcpy(cmd_ctx
->llm
->payload
, events
,
1908 sizeof(struct lttng_event
) * nb_events
);
1915 case LTTNG_START_TRACE
:
1917 struct ltt_kernel_channel
*chan
;
1919 /* Setup lttng message with no payload */
1920 ret
= setup_lttng_msg(cmd_ctx
, 0);
1925 /* Kernel tracing */
1926 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
1927 if (cmd_ctx
->session
->kernel_session
->metadata
== NULL
) {
1928 DBG("Open kernel metadata");
1929 ret
= kernel_open_metadata(cmd_ctx
->session
->kernel_session
,
1930 cmd_ctx
->session
->kernel_session
->trace_path
);
1932 ret
= LTTCOMM_KERN_META_FAIL
;
1937 if (cmd_ctx
->session
->kernel_session
->metadata_stream_fd
== 0) {
1938 DBG("Opening kernel metadata stream");
1939 if (cmd_ctx
->session
->kernel_session
->metadata_stream_fd
== 0) {
1940 ret
= kernel_open_metadata_stream(cmd_ctx
->session
->kernel_session
);
1942 ERR("Kernel create metadata stream failed");
1943 ret
= LTTCOMM_KERN_STREAM_FAIL
;
1949 /* For each channel */
1950 cds_list_for_each_entry(chan
,
1951 &cmd_ctx
->session
->kernel_session
->channel_list
.head
, list
) {
1952 if (chan
->stream_count
== 0) {
1953 ret
= kernel_open_channel_stream(chan
);
1955 ERR("Kernel create channel stream failed");
1956 ret
= LTTCOMM_KERN_STREAM_FAIL
;
1959 /* Update the stream global counter */
1960 cmd_ctx
->session
->kernel_session
->stream_count_global
+= ret
;
1964 ret
= start_kernel_trace(cmd_ctx
->session
->kernel_session
);
1966 ret
= LTTCOMM_KERN_START_FAIL
;
1970 DBG("Start kernel tracing");
1971 ret
= kernel_start_session(cmd_ctx
->session
->kernel_session
);
1973 ERR("Kernel start session failed");
1974 ret
= LTTCOMM_KERN_START_FAIL
;
1978 /* Quiescent wait after starting trace */
1979 kernel_wait_quiescent(kernel_tracer_fd
);
1982 /* TODO: Start all UST traces */
1987 case LTTNG_STOP_TRACE
:
1989 struct ltt_kernel_channel
*chan
;
1990 /* Setup lttng message with no payload */
1991 ret
= setup_lttng_msg(cmd_ctx
, 0);
1997 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
1998 DBG("Stop kernel tracing");
2000 ret
= kernel_metadata_flush_buffer(cmd_ctx
->session
->kernel_session
->metadata_stream_fd
);
2002 ERR("Kernel metadata flush failed");
2005 cds_list_for_each_entry(chan
, &cmd_ctx
->session
->kernel_session
->channel_list
.head
, list
) {
2006 ret
= kernel_flush_buffer(chan
);
2008 ERR("Kernel flush buffer error");
2012 ret
= kernel_stop_session(cmd_ctx
->session
->kernel_session
);
2014 ERR("Kernel stop session failed");
2015 ret
= LTTCOMM_KERN_STOP_FAIL
;
2019 /* Quiescent wait after stopping trace */
2020 kernel_wait_quiescent(kernel_tracer_fd
);
2023 /* TODO : User-space tracer */
2028 case LTTNG_CREATE_SESSION
:
2030 /* Setup lttng message with no payload */
2031 ret
= setup_lttng_msg(cmd_ctx
, 0);
2036 ret
= create_session(cmd_ctx
->lsm
->session
.name
, cmd_ctx
->lsm
->session
.path
);
2038 if (ret
== -EEXIST
) {
2039 ret
= LTTCOMM_EXIST_SESS
;
2041 ret
= LTTCOMM_FATAL
;
2049 case LTTNG_DESTROY_SESSION
:
2051 /* Setup lttng message with no payload */
2052 ret
= setup_lttng_msg(cmd_ctx
, 0);
2057 /* Clean kernel session teardown */
2058 teardown_kernel_session(cmd_ctx
->session
);
2060 ret
= destroy_session(cmd_ctx
->lsm
->session
.name
);
2062 ret
= LTTCOMM_FATAL
;
2067 * Must notify the kernel thread here to update it's pollfd in order to
2068 * remove the channel(s)' fd just destroyed.
2070 ret
= notify_kernel_pollfd();
2072 ret
= LTTCOMM_FATAL
;
2079 case LTTNG_LIST_DOMAINS
:
2083 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2087 nb_dom
+= cmd_ctx
->session
->ust_trace_count
;
2089 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_domain
) * nb_dom
);
2094 ((struct lttng_domain
*)(cmd_ctx
->llm
->payload
))[0].type
=
2095 LTTNG_DOMAIN_KERNEL
;
2097 /* TODO: User-space tracer domain support */
2101 case LTTNG_LIST_CHANNELS
:
2104 * TODO: Only kernel channels are listed here. UST listing
2105 * is needed on lttng-ust 2.0 release.
2108 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2109 nb_chan
+= cmd_ctx
->session
->kernel_session
->channel_count
;
2112 ret
= setup_lttng_msg(cmd_ctx
,
2113 sizeof(struct lttng_channel
) * nb_chan
);
2118 list_lttng_channels(cmd_ctx
->session
,
2119 (struct lttng_channel
*)(cmd_ctx
->llm
->payload
));
2124 case LTTNG_LIST_EVENTS
:
2127 * TODO: Only kernel events are listed here. UST listing
2128 * is needed on lttng-ust 2.0 release.
2130 size_t nb_event
= 0;
2131 struct ltt_kernel_channel
*kchan
= NULL
;
2133 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2134 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.list
.channel_name
,
2135 cmd_ctx
->session
->kernel_session
);
2136 if (kchan
== NULL
) {
2137 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2140 nb_event
+= kchan
->event_count
;
2143 ret
= setup_lttng_msg(cmd_ctx
,
2144 sizeof(struct lttng_event
) * nb_event
);
2149 DBG("Listing events (%zu events)", nb_event
);
2151 list_lttng_events(kchan
,
2152 (struct lttng_event
*)(cmd_ctx
->llm
->payload
));
2157 case LTTNG_LIST_SESSIONS
:
2159 lock_session_list();
2161 if (session_list_ptr
->count
== 0) {
2162 ret
= LTTCOMM_NO_SESSION
;
2163 unlock_session_list();
2167 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) *
2168 session_list_ptr
->count
);
2170 unlock_session_list();
2174 /* Filled the session array */
2175 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
));
2177 unlock_session_list();
2182 case LTTNG_CALIBRATE
:
2184 /* Setup lttng message with no payload */
2185 ret
= setup_lttng_msg(cmd_ctx
, 0);
2190 switch (cmd_ctx
->lsm
->domain
.type
) {
2191 case LTTNG_DOMAIN_KERNEL
:
2193 struct lttng_kernel_calibrate kcalibrate
;
2195 kcalibrate
.type
= cmd_ctx
->lsm
->u
.calibrate
.type
;
2196 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2198 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2204 /* TODO: Userspace tracing */
2205 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2211 case LTTNG_REGISTER_CONSUMER
:
2215 /* Setup lttng message with no payload */
2216 ret
= setup_lttng_msg(cmd_ctx
, 0);
2221 switch (cmd_ctx
->lsm
->domain
.type
) {
2222 case LTTNG_DOMAIN_KERNEL
:
2224 /* Can't register a consumer if there is already one */
2225 if (cmd_ctx
->session
->kernel_session
->consumer_fd
!= 0) {
2226 ret
= LTTCOMM_CONNECT_FAIL
;
2230 sock
= lttcomm_connect_unix_sock(cmd_ctx
->lsm
->u
.reg
.path
);
2232 ret
= LTTCOMM_CONNECT_FAIL
;
2236 cmd_ctx
->session
->kernel_session
->consumer_fd
= sock
;
2240 /* TODO: Userspace tracing */
2241 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2250 /* Undefined command */
2251 ret
= setup_lttng_msg(cmd_ctx
, 0);
2260 /* Set return code */
2261 cmd_ctx
->llm
->ret_code
= ret
;
2263 if (cmd_ctx
->session
) {
2264 unlock_session(cmd_ctx
->session
);
2270 if (cmd_ctx
->llm
== NULL
) {
2271 DBG("Missing llm structure. Allocating one.");
2272 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
2276 /* Notify client of error */
2277 cmd_ctx
->llm
->ret_code
= ret
;
2280 if (cmd_ctx
->session
) {
2281 unlock_session(cmd_ctx
->session
);
2287 * This thread manage all clients request using the unix client socket for
2290 static void *thread_manage_clients(void *data
)
2293 struct command_ctx
*cmd_ctx
= NULL
;
2294 struct pollfd pollfd
[2];
2296 DBG("[thread] Manage client started");
2298 ret
= lttcomm_listen_unix_sock(client_sock
);
2303 /* First fd is always the quit pipe */
2304 pollfd
[0].fd
= thread_quit_pipe
[0];
2307 pollfd
[1].fd
= client_sock
;
2308 pollfd
[1].events
= POLLIN
;
2310 /* Notify parent pid that we are ready
2311 * to accept command for client side.
2313 if (opt_sig_parent
) {
2314 kill(ppid
, SIGCHLD
);
2318 DBG("Accepting client command ...");
2320 /* Inifinite blocking call, waiting for transmission */
2321 ret
= poll(pollfd
, 2, -1);
2323 perror("poll client thread");
2327 /* Thread quit pipe has been closed. Killing thread. */
2328 if (pollfd
[0].revents
== POLLNVAL
) {
2330 } else if (pollfd
[1].revents
== POLLERR
) {
2331 ERR("Client socket poll error");
2335 sock
= lttcomm_accept_unix_sock(client_sock
);
2340 /* Allocate context command to process the client request */
2341 cmd_ctx
= malloc(sizeof(struct command_ctx
));
2343 /* Allocate data buffer for reception */
2344 cmd_ctx
->lsm
= malloc(sizeof(struct lttcomm_session_msg
));
2345 cmd_ctx
->llm
= NULL
;
2346 cmd_ctx
->session
= NULL
;
2349 * Data is received from the lttng client. The struct
2350 * lttcomm_session_msg (lsm) contains the command and data request of
2353 DBG("Receiving data from client ...");
2354 ret
= lttcomm_recv_unix_sock(sock
, cmd_ctx
->lsm
, sizeof(struct lttcomm_session_msg
));
2359 // TODO: Validate cmd_ctx including sanity check for security purpose.
2362 * This function dispatch the work to the kernel or userspace tracer
2363 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2364 * informations for the client. The command context struct contains
2365 * everything this function may needs.
2367 ret
= process_client_msg(cmd_ctx
);
2369 /* TODO: Inform client somehow of the fatal error. At this point,
2370 * ret < 0 means that a malloc failed (ENOMEM). */
2371 /* Error detected but still accept command */
2372 clean_command_ctx(&cmd_ctx
);
2376 DBG("Sending response (size: %d, retcode: %d)",
2377 cmd_ctx
->lttng_msg_size
, cmd_ctx
->llm
->ret_code
);
2378 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
2380 ERR("Failed to send data back to client");
2383 clean_command_ctx(&cmd_ctx
);
2385 /* End of transmission */
2390 DBG("Client thread dying");
2398 unlink(client_unix_sock_path
);
2400 clean_command_ctx(&cmd_ctx
);
2406 * usage function on stderr
2408 static void usage(void)
2410 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
2411 fprintf(stderr
, " -h, --help Display this usage.\n");
2412 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
2413 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
2414 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
2415 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
2416 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
2417 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
2418 fprintf(stderr
, " -V, --version Show version number.\n");
2419 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
2420 fprintf(stderr
, " -q, --quiet No output at all.\n");
2421 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
2422 fprintf(stderr
, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n");
2426 * daemon argument parsing
2428 static int parse_args(int argc
, char **argv
)
2432 static struct option long_options
[] = {
2433 { "client-sock", 1, 0, 'c' },
2434 { "apps-sock", 1, 0, 'a' },
2435 { "kconsumerd-cmd-sock", 1, 0, 0 },
2436 { "kconsumerd-err-sock", 1, 0, 0 },
2437 { "daemonize", 0, 0, 'd' },
2438 { "sig-parent", 0, 0, 'S' },
2439 { "help", 0, 0, 'h' },
2440 { "group", 1, 0, 'g' },
2441 { "version", 0, 0, 'V' },
2442 { "quiet", 0, 0, 'q' },
2443 { "verbose", 0, 0, 'v' },
2444 { "verbose-kconsumerd", 0, 0, 'Z' },
2449 int option_index
= 0;
2450 c
= getopt_long(argc
, argv
, "dhqvVS" "a:c:g:s:E:C:Z", long_options
, &option_index
);
2457 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
2459 fprintf(stderr
, " with arg %s\n", optarg
);
2463 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2466 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2472 opt_tracing_group
= strdup(optarg
);
2478 fprintf(stdout
, "%s\n", VERSION
);
2484 snprintf(kconsumerd_err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2487 snprintf(kconsumerd_cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2493 /* Verbose level can increase using multiple -v */
2497 opt_verbose_kconsumerd
+= 1;
2500 /* Unknown option or other error.
2501 * Error is printed by getopt, just return */
2510 * Creates the two needed socket by the daemon.
2511 * apps_sock - The communication socket for all UST apps.
2512 * client_sock - The communication of the cli tool (lttng).
2514 static int init_daemon_socket(void)
2519 old_umask
= umask(0);
2521 /* Create client tool unix socket */
2522 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
2523 if (client_sock
< 0) {
2524 ERR("Create unix sock failed: %s", client_unix_sock_path
);
2529 /* File permission MUST be 660 */
2530 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
2532 ERR("Set file permissions failed: %s", client_unix_sock_path
);
2537 /* Create the application unix socket */
2538 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
2539 if (apps_sock
< 0) {
2540 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
2545 /* File permission MUST be 666 */
2546 ret
= chmod(apps_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
2548 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
2559 * Check if the global socket is available, and if a daemon is answering
2560 * at the other side. If yes, error is returned.
2562 static int check_existing_daemon(void)
2564 if (access(client_unix_sock_path
, F_OK
) < 0 &&
2565 access(apps_unix_sock_path
, F_OK
) < 0)
2567 /* Is there anybody out there ? */
2568 if (lttng_session_daemon_alive())
2575 * Set the tracing group gid onto the client socket.
2577 * Race window between mkdir and chown is OK because we are going from more
2578 * permissive (root.root) to les permissive (root.tracing).
2580 static int set_permissions(void)
2585 gid
= allowed_group();
2588 WARN("No tracing group detected");
2591 ERR("Missing tracing group. Aborting execution.");
2597 /* Set lttng run dir */
2598 ret
= chown(LTTNG_RUNDIR
, 0, gid
);
2600 ERR("Unable to set group on " LTTNG_RUNDIR
);
2604 /* lttng client socket path */
2605 ret
= chown(client_unix_sock_path
, 0, gid
);
2607 ERR("Unable to set group on %s", client_unix_sock_path
);
2611 /* kconsumerd error socket path */
2612 ret
= chown(kconsumerd_err_unix_sock_path
, 0, gid
);
2614 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path
);
2618 DBG("All permissions are set");
2625 * Create the pipe used to wake up the kernel thread.
2627 static int create_kernel_poll_pipe(void)
2629 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
2633 * Create the lttng run directory needed for all global sockets and pipe.
2635 static int create_lttng_rundir(void)
2639 ret
= mkdir(LTTNG_RUNDIR
, S_IRWXU
| S_IRWXG
);
2641 if (errno
!= EEXIST
) {
2642 ERR("Unable to create " LTTNG_RUNDIR
);
2654 * Setup sockets and directory needed by the kconsumerd communication with the
2657 static int set_kconsumerd_sockets(void)
2661 if (strlen(kconsumerd_err_unix_sock_path
) == 0) {
2662 snprintf(kconsumerd_err_unix_sock_path
, PATH_MAX
, KCONSUMERD_ERR_SOCK_PATH
);
2665 if (strlen(kconsumerd_cmd_unix_sock_path
) == 0) {
2666 snprintf(kconsumerd_cmd_unix_sock_path
, PATH_MAX
, KCONSUMERD_CMD_SOCK_PATH
);
2669 ret
= mkdir(KCONSUMERD_PATH
, S_IRWXU
| S_IRWXG
);
2671 if (errno
!= EEXIST
) {
2672 ERR("Failed to create " KCONSUMERD_PATH
);
2678 /* Create the kconsumerd error unix socket */
2679 kconsumerd_err_sock
= lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path
);
2680 if (kconsumerd_err_sock
< 0) {
2681 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path
);
2686 /* File permission MUST be 660 */
2687 ret
= chmod(kconsumerd_err_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
2689 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path
);
2699 * Signal handler for the daemon
2701 * Simply stop all worker threads, leaving main() return gracefully
2702 * after joining all threads and calling cleanup().
2704 static void sighandler(int sig
)
2708 DBG("SIGPIPE catched");
2711 DBG("SIGINT catched");
2715 DBG("SIGTERM catched");
2724 * Setup signal handler for :
2725 * SIGINT, SIGTERM, SIGPIPE
2727 static int set_signal_handler(void)
2730 struct sigaction sa
;
2733 if ((ret
= sigemptyset(&sigset
)) < 0) {
2734 perror("sigemptyset");
2738 sa
.sa_handler
= sighandler
;
2739 sa
.sa_mask
= sigset
;
2741 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
2742 perror("sigaction");
2746 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
2747 perror("sigaction");
2751 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
2752 perror("sigaction");
2756 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
2762 * Set open files limit to unlimited. This daemon can open a large number of
2763 * file descriptors in order to consumer multiple kernel traces.
2765 static void set_ulimit(void)
2770 /* The kernel does not allowed an infinite limit for open files */
2771 lim
.rlim_cur
= 65535;
2772 lim
.rlim_max
= 65535;
2774 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
2776 perror("failed to set open files limit");
2783 int main(int argc
, char **argv
)
2787 const char *home_path
;
2789 /* Create thread quit pipe */
2790 if ((ret
= init_thread_quit_pipe()) < 0) {
2794 /* Parse arguments */
2796 if ((ret
= parse_args(argc
, argv
) < 0)) {
2809 /* Check if daemon is UID = 0 */
2810 is_root
= !getuid();
2813 ret
= create_lttng_rundir();
2818 if (strlen(apps_unix_sock_path
) == 0) {
2819 snprintf(apps_unix_sock_path
, PATH_MAX
,
2820 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
2823 if (strlen(client_unix_sock_path
) == 0) {
2824 snprintf(client_unix_sock_path
, PATH_MAX
,
2825 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
2828 home_path
= get_home_dir();
2829 if (home_path
== NULL
) {
2830 /* TODO: Add --socket PATH option */
2831 ERR("Can't get HOME directory for sockets creation.");
2836 if (strlen(apps_unix_sock_path
) == 0) {
2837 snprintf(apps_unix_sock_path
, PATH_MAX
,
2838 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
2841 /* Set the cli tool unix socket path */
2842 if (strlen(client_unix_sock_path
) == 0) {
2843 snprintf(client_unix_sock_path
, PATH_MAX
,
2844 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
2848 DBG("Client socket path %s", client_unix_sock_path
);
2849 DBG("Application socket path %s", apps_unix_sock_path
);
2852 * See if daemon already exist.
2854 if ((ret
= check_existing_daemon()) < 0) {
2855 ERR("Already running daemon.\n");
2857 * We do not goto exit because we must not cleanup()
2858 * because a daemon is already running.
2863 /* After this point, we can safely call cleanup() so goto error is used */
2866 * These actions must be executed as root. We do that *after* setting up
2867 * the sockets path because we MUST make the check for another daemon using
2868 * those paths *before* trying to set the kernel consumer sockets and init
2872 ret
= set_kconsumerd_sockets();
2877 /* Setup kernel tracer */
2878 init_kernel_tracer();
2880 /* Set ulimit for open files */
2884 if ((ret
= set_signal_handler()) < 0) {
2888 /* Setup the needed unix socket */
2889 if ((ret
= init_daemon_socket()) < 0) {
2893 /* Set credentials to socket */
2894 if (is_root
&& ((ret
= set_permissions()) < 0)) {
2898 /* Get parent pid if -S, --sig-parent is specified. */
2899 if (opt_sig_parent
) {
2903 /* Setup the kernel pipe for waking up the kernel thread */
2904 if ((ret
= create_kernel_poll_pipe()) < 0) {
2909 * Get session list pointer. This pointer MUST NOT be free().
2910 * This list is statically declared in session.c
2912 session_list_ptr
= get_session_list();
2914 /* Create thread to manage the client socket */
2915 ret
= pthread_create(&client_thread
, NULL
, thread_manage_clients
, (void *) NULL
);
2917 perror("pthread_create");
2921 /* Create thread to manage application socket */
2922 ret
= pthread_create(&apps_thread
, NULL
, thread_manage_apps
, (void *) NULL
);
2924 perror("pthread_create");
2928 /* Create kernel thread to manage kernel event */
2929 ret
= pthread_create(&kernel_thread
, NULL
, thread_manage_kernel
, (void *) NULL
);
2931 perror("pthread_create");
2935 ret
= pthread_join(kernel_thread
, &status
);
2937 perror("pthread_join");
2938 goto error
; /* join error, exit without cleanup */
2942 ret
= pthread_join(apps_thread
, &status
);
2944 perror("pthread_join");
2945 goto error
; /* join error, exit without cleanup */
2949 ret
= pthread_join(client_thread
, &status
);
2951 perror("pthread_join");
2952 goto error
; /* join error, exit without cleanup */
2955 ret
= join_kconsumerd_thread();
2957 perror("join_kconsumerd");
2958 goto error
; /* join error, exit without cleanup */
2964 * cleanup() is called when no other thread is running.