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"
57 #include "benchmark.h"
60 const char default_home_dir
[] = DEFAULT_HOME_DIR
;
61 const char default_tracing_group
[] = LTTNG_DEFAULT_TRACING_GROUP
;
62 const char default_ust_sock_dir
[] = DEFAULT_UST_SOCK_DIR
;
63 const char default_global_apps_pipe
[] = DEFAULT_GLOBAL_APPS_PIPE
;
66 int opt_verbose
; /* Not static for lttngerr.h */
67 int opt_verbose_kconsumerd
; /* Not static for lttngerr.h */
68 int opt_quiet
; /* Not static for lttngerr.h */
71 const char *opt_tracing_group
;
72 static int opt_sig_parent
;
73 static int opt_daemon
;
74 static int is_root
; /* Set to 1 if the daemon is running as root */
75 static pid_t ppid
; /* Parent PID for --sig-parent option */
76 static pid_t kconsumerd_pid
;
77 static struct pollfd
*kernel_pollfd
;
79 static char apps_unix_sock_path
[PATH_MAX
]; /* Global application Unix socket path */
80 static char client_unix_sock_path
[PATH_MAX
]; /* Global client Unix socket path */
81 static char kconsumerd_err_unix_sock_path
[PATH_MAX
]; /* kconsumerd error Unix socket path */
82 static char kconsumerd_cmd_unix_sock_path
[PATH_MAX
]; /* kconsumerd command Unix socket path */
85 static int client_sock
;
87 static int kconsumerd_err_sock
;
88 static int kconsumerd_cmd_sock
;
89 static int kernel_tracer_fd
;
90 static int kernel_poll_pipe
[2];
93 * Quit pipe for all threads. This permits a single cancellation point
94 * for all threads when receiving an event on the pipe.
96 static int thread_quit_pipe
[2];
98 /* Pthread, Mutexes and Semaphores */
99 static pthread_t kconsumerd_thread
;
100 static pthread_t apps_thread
;
101 static pthread_t client_thread
;
102 static pthread_t kernel_thread
;
103 static sem_t kconsumerd_sem
;
105 static pthread_mutex_t kconsumerd_pid_mutex
; /* Mutex to control kconsumerd pid assignation */
107 static int modprobe_remove_kernel_modules(void);
110 * Pointer initialized before thread creation.
112 * This points to the tracing session list containing the session count and a
113 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
114 * MUST NOT be taken if you call a public function in session.c.
116 * The lock is nested inside the structure: session_list_ptr->lock. Please use
117 * lock_session_list and unlock_session_list for lock acquisition.
119 static struct ltt_session_list
*session_list_ptr
;
121 static gid_t
allowed_group(void)
125 if (opt_tracing_group
) {
126 grp
= getgrnam(opt_tracing_group
);
128 grp
= getgrnam(default_tracing_group
);
140 * Return -1 on error or 0 if all pipes are created.
142 static int init_thread_quit_pipe(void)
146 ret
= pipe2(thread_quit_pipe
, O_CLOEXEC
);
148 perror("thread quit pipe");
157 * Complete teardown of a kernel session. This free all data structure related
158 * to a kernel session and update counter.
160 static void teardown_kernel_session(struct ltt_session
*session
)
162 if (session
->kernel_session
!= NULL
) {
163 DBG("Tearing down kernel session");
166 * If a custom kernel consumer was registered, close the socket before
167 * tearing down the complete kernel session structure
169 if (session
->kernel_session
->consumer_fd
!= kconsumerd_cmd_sock
) {
170 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
173 trace_destroy_kernel_session(session
->kernel_session
);
174 /* Extra precaution */
175 session
->kernel_session
= NULL
;
179 static void stop_threads(void)
181 /* Stopping all threads */
182 DBG("Terminating all threads");
183 close(thread_quit_pipe
[0]);
184 close(thread_quit_pipe
[1]);
190 static void cleanup(void)
194 struct ltt_session
*sess
, *stmp
;
199 MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm"
200 "Matthew, BEET driven development works!%c[%dm",
201 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
204 DBG("Removing %s directory", LTTNG_RUNDIR
);
205 ret
= asprintf(&cmd
, "rm -rf " LTTNG_RUNDIR
);
207 ERR("asprintf failed. Something is really wrong!");
210 /* Remove lttng run directory */
213 ERR("Unable to clean " LTTNG_RUNDIR
);
216 DBG("Cleaning up all session");
218 /* Destroy session list mutex */
219 if (session_list_ptr
!= NULL
) {
220 pthread_mutex_destroy(&session_list_ptr
->lock
);
222 /* Cleanup ALL session */
223 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
224 teardown_kernel_session(sess
);
225 // TODO complete session cleanup (including UST)
229 pthread_mutex_destroy(&kconsumerd_pid_mutex
);
231 DBG("Closing kernel fd");
232 close(kernel_tracer_fd
);
234 DBG("Unloading kernel modules");
235 modprobe_remove_kernel_modules();
237 /* OUTPUT BENCHMARK RESULTS */
240 bench_print_boot_process();
247 * Send data on a unix socket using the liblttsessiondcomm API.
249 * Return lttcomm error code.
251 static int send_unix_sock(int sock
, void *buf
, size_t len
)
253 /* Check valid length */
258 return lttcomm_send_unix_sock(sock
, buf
, len
);
262 * Free memory of a command context structure.
264 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
266 DBG("Clean command context structure");
268 if ((*cmd_ctx
)->llm
) {
269 free((*cmd_ctx
)->llm
);
271 if ((*cmd_ctx
)->lsm
) {
272 free((*cmd_ctx
)->lsm
);
280 * Send all stream fds of kernel channel to the consumer.
282 static int send_kconsumerd_channel_fds(int sock
, struct ltt_kernel_channel
*channel
)
286 struct ltt_kernel_stream
*stream
;
287 struct lttcomm_kconsumerd_header lkh
;
288 struct lttcomm_kconsumerd_msg lkm
;
290 DBG("Sending fds of channel %s to kernel consumer", channel
->channel
->name
);
292 nb_fd
= channel
->stream_count
;
295 lkh
.payload_size
= nb_fd
* sizeof(struct lttcomm_kconsumerd_msg
);
296 lkh
.cmd_type
= ADD_STREAM
;
298 DBG("Sending kconsumerd header");
300 ret
= lttcomm_send_unix_sock(sock
, &lkh
, sizeof(struct lttcomm_kconsumerd_header
));
302 perror("send kconsumerd header");
306 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
307 if (stream
->fd
!= 0) {
309 lkm
.state
= stream
->state
;
310 lkm
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
311 lkm
.output
= channel
->channel
->attr
.output
;
312 strncpy(lkm
.path_name
, stream
->pathname
, PATH_MAX
);
313 lkm
.path_name
[PATH_MAX
- 1] = '\0';
315 DBG("Sending fd %d to kconsumerd", lkm
.fd
);
317 ret
= lttcomm_send_fds_unix_sock(sock
, &lkm
, &lkm
.fd
, 1, sizeof(lkm
));
319 perror("send kconsumerd fd");
325 DBG("Kconsumerd channel fds sent");
334 * Send all stream fds of the kernel session to the consumer.
336 static int send_kconsumerd_fds(struct ltt_kernel_session
*session
)
339 struct ltt_kernel_channel
*chan
;
340 struct lttcomm_kconsumerd_header lkh
;
341 struct lttcomm_kconsumerd_msg lkm
;
344 lkh
.payload_size
= sizeof(struct lttcomm_kconsumerd_msg
);
345 lkh
.cmd_type
= ADD_STREAM
;
347 DBG("Sending kconsumerd header for metadata");
349 ret
= lttcomm_send_unix_sock(session
->consumer_fd
, &lkh
, sizeof(struct lttcomm_kconsumerd_header
));
351 perror("send kconsumerd header");
355 DBG("Sending metadata stream fd");
357 /* Extra protection. It's NOT suppose to be set to 0 at this point */
358 if (session
->consumer_fd
== 0) {
359 session
->consumer_fd
= kconsumerd_cmd_sock
;
362 if (session
->metadata_stream_fd
!= 0) {
363 /* Send metadata stream fd first */
364 lkm
.fd
= session
->metadata_stream_fd
;
365 lkm
.state
= ACTIVE_FD
;
366 lkm
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
367 lkm
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
368 strncpy(lkm
.path_name
, session
->metadata
->pathname
, PATH_MAX
);
369 lkm
.path_name
[PATH_MAX
- 1] = '\0';
371 ret
= lttcomm_send_fds_unix_sock(session
->consumer_fd
, &lkm
, &lkm
.fd
, 1, sizeof(lkm
));
373 perror("send kconsumerd fd");
378 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
379 ret
= send_kconsumerd_channel_fds(session
->consumer_fd
, chan
);
385 DBG("Kconsumerd fds (metadata and channel streams) sent");
395 * Return a socket connected to the libust communication socket of the
396 * application identified by the pid.
398 * If the pid is not found in the traceable list, return -1 to indicate error.
400 static int ust_connect_app(pid_t pid
)
403 struct ltt_traceable_app
*lta
;
405 DBG("Connect to application pid %d", pid
);
407 lta
= find_app_by_pid(pid
);
410 DBG("Application pid %d not found", pid
);
414 sock
= ustctl_connect_pid(lta
->pid
);
416 ERR("Fail connecting to the PID %d", pid
);
421 #endif /* DISABLED */
424 * Notify apps by writing 42 to a named pipe using name. Every applications
425 * waiting for a ltt-sessiond will be notified and re-register automatically to
426 * the session daemon.
428 * Return open or write error value.
430 static int notify_apps(const char *name
)
435 DBG("Notify the global application pipe");
437 /* Try opening the global pipe */
438 fd
= open(name
, O_WRONLY
);
443 /* Notify by writing on the pipe */
444 ret
= write(fd
, "42", 2);
454 * Setup the outgoing data buffer for the response (llm) by allocating the
455 * right amount of memory and copying the original information from the lsm
458 * Return total size of the buffer pointed by buf.
460 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
466 cmd_ctx
->llm
= malloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
467 if (cmd_ctx
->llm
== NULL
) {
473 /* Copy common data */
474 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
475 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
477 cmd_ctx
->llm
->data_size
= size
;
478 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
487 * Update the kernel pollfd set of all channel fd available over all tracing
488 * session. Add the wakeup pipe at the end of the set.
490 static int update_kernel_pollfd(void)
494 * The wakup pipe and the quit pipe are needed so the number of fds starts
495 * at 2 for those pipes.
497 unsigned int nb_fd
= 2;
498 struct ltt_session
*session
;
499 struct ltt_kernel_channel
*channel
;
501 DBG("Updating kernel_pollfd");
503 /* Get the number of channel of all kernel session */
505 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
506 lock_session(session
);
507 if (session
->kernel_session
== NULL
) {
508 unlock_session(session
);
511 nb_fd
+= session
->kernel_session
->channel_count
;
512 unlock_session(session
);
515 DBG("Resizing kernel_pollfd to size %d", nb_fd
);
517 kernel_pollfd
= realloc(kernel_pollfd
, nb_fd
* sizeof(struct pollfd
));
518 if (kernel_pollfd
== NULL
) {
519 perror("malloc kernel_pollfd");
523 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
524 lock_session(session
);
525 if (session
->kernel_session
== NULL
) {
526 unlock_session(session
);
530 ERR("To much channel for kernel_pollfd size");
531 unlock_session(session
);
534 cds_list_for_each_entry(channel
, &session
->kernel_session
->channel_list
.head
, list
) {
535 kernel_pollfd
[i
].fd
= channel
->fd
;
536 kernel_pollfd
[i
].events
= POLLIN
| POLLRDNORM
;
539 unlock_session(session
);
541 unlock_session_list();
543 /* Adding wake up pipe */
544 kernel_pollfd
[nb_fd
- 2].fd
= kernel_poll_pipe
[0];
545 kernel_pollfd
[nb_fd
- 2].events
= POLLIN
;
547 /* Adding the quit pipe */
548 kernel_pollfd
[nb_fd
- 1].fd
= thread_quit_pipe
[0];
553 unlock_session_list();
558 * Find the channel fd from 'fd' over all tracing session. When found, check
559 * for new channel stream and send those stream fds to the kernel consumer.
561 * Useful for CPU hotplug feature.
563 static int update_kernel_stream(int fd
)
566 struct ltt_session
*session
;
567 struct ltt_kernel_channel
*channel
;
569 DBG("Updating kernel streams for channel fd %d", fd
);
572 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
573 lock_session(session
);
574 if (session
->kernel_session
== NULL
) {
575 unlock_session(session
);
579 /* This is not suppose to be 0 but this is an extra security check */
580 if (session
->kernel_session
->consumer_fd
== 0) {
581 session
->kernel_session
->consumer_fd
= kconsumerd_cmd_sock
;
584 cds_list_for_each_entry(channel
, &session
->kernel_session
->channel_list
.head
, list
) {
585 if (channel
->fd
== fd
) {
586 DBG("Channel found, updating kernel streams");
587 ret
= kernel_open_channel_stream(channel
);
593 * Have we already sent fds to the consumer? If yes, it means that
594 * tracing is started so it is safe to send our updated stream fds.
596 if (session
->kernel_session
->kconsumer_fds_sent
== 1) {
597 ret
= send_kconsumerd_channel_fds(session
->kernel_session
->consumer_fd
,
606 unlock_session(session
);
610 unlock_session_list();
612 unlock_session(session
);
618 * This thread manage event coming from the kernel.
620 * Features supported in this thread:
623 static void *thread_manage_kernel(void *data
)
625 int ret
, i
, nb_fd
= 0;
627 int update_poll_flag
= 1;
629 tracepoint(sessiond_th_kern_start
);
631 DBG("Thread manage kernel started");
634 if (update_poll_flag
== 1) {
635 nb_fd
= update_kernel_pollfd();
639 update_poll_flag
= 0;
642 DBG("Polling on %d fds", nb_fd
);
644 tracepoint(sessiond_th_kern_poll
);
646 /* Poll infinite value of time */
647 ret
= poll(kernel_pollfd
, nb_fd
, -1);
649 perror("poll kernel thread");
651 } else if (ret
== 0) {
652 /* Should not happen since timeout is infinite */
656 /* Thread quit pipe has been closed. Killing thread. */
657 if (kernel_pollfd
[nb_fd
- 1].revents
== POLLNVAL
) {
661 DBG("Kernel poll event triggered");
664 * Check if the wake up pipe was triggered. If so, the kernel_pollfd
667 switch (kernel_pollfd
[nb_fd
- 2].revents
) {
669 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
670 update_poll_flag
= 1;
678 for (i
= 0; i
< nb_fd
; i
++) {
679 switch (kernel_pollfd
[i
].revents
) {
681 * New CPU detected by the kernel. Adding kernel stream to kernel
682 * session and updating the kernel consumer
684 case POLLIN
| POLLRDNORM
:
685 ret
= update_kernel_stream(kernel_pollfd
[i
].fd
);
695 DBG("Kernel thread dying");
700 close(kernel_poll_pipe
[0]);
701 close(kernel_poll_pipe
[1]);
706 * This thread manage the kconsumerd error sent back to the session daemon.
708 static void *thread_manage_kconsumerd(void *data
)
711 enum lttcomm_return_code code
;
712 struct pollfd pollfd
[2];
714 tracepoint(sessiond_th_kcon_start
);
716 DBG("[thread] Manage kconsumerd started");
718 ret
= lttcomm_listen_unix_sock(kconsumerd_err_sock
);
723 /* First fd is always the quit pipe */
724 pollfd
[0].fd
= thread_quit_pipe
[0];
727 pollfd
[1].fd
= kconsumerd_err_sock
;
728 pollfd
[1].events
= POLLIN
;
730 tracepoint(sessiond_th_kcon_poll
);
732 /* Inifinite blocking call, waiting for transmission */
733 ret
= poll(pollfd
, 2, -1);
735 perror("poll kconsumerd thread");
739 /* Thread quit pipe has been closed. Killing thread. */
740 if (pollfd
[0].revents
== POLLNVAL
) {
742 } else if (pollfd
[1].revents
== POLLERR
) {
743 ERR("Kconsumerd err socket poll error");
747 sock
= lttcomm_accept_unix_sock(kconsumerd_err_sock
);
752 /* Getting status code from kconsumerd */
753 ret
= lttcomm_recv_unix_sock(sock
, &code
, sizeof(enum lttcomm_return_code
));
758 if (code
== KCONSUMERD_COMMAND_SOCK_READY
) {
759 kconsumerd_cmd_sock
= lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path
);
760 if (kconsumerd_cmd_sock
< 0) {
761 sem_post(&kconsumerd_sem
);
762 perror("kconsumerd connect");
765 /* Signal condition to tell that the kconsumerd is ready */
766 sem_post(&kconsumerd_sem
);
767 DBG("Kconsumerd command socket ready");
769 DBG("Kconsumerd error when waiting for SOCK_READY : %s",
770 lttcomm_get_readable_code(-code
));
774 /* Kconsumerd err socket */
776 pollfd
[1].events
= POLLIN
;
778 /* Inifinite blocking call, waiting for transmission */
779 ret
= poll(pollfd
, 2, -1);
781 perror("poll kconsumerd thread");
785 /* Thread quit pipe has been closed. Killing thread. */
786 if (pollfd
[0].revents
== POLLNVAL
) {
788 } else if (pollfd
[1].revents
== POLLERR
) {
789 ERR("Kconsumerd err socket second poll error");
793 /* Wait for any kconsumerd error */
794 ret
= lttcomm_recv_unix_sock(sock
, &code
, sizeof(enum lttcomm_return_code
));
796 ERR("Kconsumerd closed the command socket");
800 ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code
));
803 DBG("Kconsumerd thread dying");
804 if (kconsumerd_err_sock
) {
805 close(kconsumerd_err_sock
);
807 if (kconsumerd_cmd_sock
) {
808 close(kconsumerd_cmd_sock
);
814 unlink(kconsumerd_err_unix_sock_path
);
815 unlink(kconsumerd_cmd_unix_sock_path
);
822 * This thread manage the application socket communication
824 static void *thread_manage_apps(void *data
)
827 struct pollfd pollfd
[2];
829 tracepoint(sessiond_th_apps_start
);
831 /* TODO: Something more elegant is needed but fine for now */
832 /* FIXME: change all types to either uint8_t, uint32_t, uint64_t
833 * for 32-bit vs 64-bit compat processes. */
834 /* replicate in ust with version number */
836 int reg
; /* 1:register, 0:unregister */
841 DBG("[thread] Manage apps started");
843 ret
= lttcomm_listen_unix_sock(apps_sock
);
848 /* First fd is always the quit pipe */
849 pollfd
[0].fd
= thread_quit_pipe
[0];
852 pollfd
[1].fd
= apps_sock
;
853 pollfd
[1].events
= POLLIN
;
855 /* Notify all applications to register */
856 notify_apps(default_global_apps_pipe
);
859 DBG("Accepting application registration");
861 tracepoint(sessiond_th_apps_poll
);
863 /* Inifinite blocking call, waiting for transmission */
864 ret
= poll(pollfd
, 2, -1);
866 perror("poll apps thread");
870 /* Thread quit pipe has been closed. Killing thread. */
871 if (pollfd
[0].revents
== POLLNVAL
) {
873 } else if (pollfd
[1].revents
== POLLERR
) {
874 ERR("Apps socket poll error");
878 sock
= lttcomm_accept_unix_sock(apps_sock
);
884 * Using message-based transmissions to ensure we don't
885 * have to deal with partially received messages.
887 ret
= lttcomm_recv_unix_sock(sock
, ®_msg
, sizeof(reg_msg
));
893 /* Add application to the global traceable list */
894 if (reg_msg
.reg
== 1) {
897 * TODO: socket should be either passed to a
898 * listener thread (for more messages) or
899 * closed. It currently leaks.
901 ret
= register_traceable_app(reg_msg
.pid
, reg_msg
.uid
);
903 /* register_traceable_app only return an error with
904 * ENOMEM. At this point, we better stop everything.
910 unregister_traceable_app(reg_msg
.pid
);
915 DBG("Apps thread dying");
923 unlink(apps_unix_sock_path
);
928 * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
929 * exec or it will fails.
931 static int spawn_kconsumerd_thread(void)
935 /* Setup semaphore */
936 sem_init(&kconsumerd_sem
, 0, 0);
938 ret
= pthread_create(&kconsumerd_thread
, NULL
, thread_manage_kconsumerd
, (void *) NULL
);
940 perror("pthread_create kconsumerd");
944 /* Wait for the kconsumerd thread to be ready */
945 sem_wait(&kconsumerd_sem
);
947 if (kconsumerd_pid
== 0) {
948 ERR("Kconsumerd did not start");
955 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
960 * Join kernel consumer thread
962 static int join_kconsumerd_thread(void)
967 if (kconsumerd_pid
!= 0) {
968 ret
= kill(kconsumerd_pid
, SIGTERM
);
970 ERR("Error killing kconsumerd");
973 return pthread_join(kconsumerd_thread
, &status
);
980 * Fork and exec a kernel consumer daemon (kconsumerd).
982 * Return pid if successful else -1.
984 static pid_t
spawn_kconsumerd(void)
988 const char *verbosity
;
990 DBG("Spawning kconsumerd");
997 if (opt_verbose
> 1 || opt_verbose_kconsumerd
) {
998 verbosity
= "--verbose";
1000 verbosity
= "--quiet";
1002 execl(INSTALL_BIN_PATH
"/ltt-kconsumerd", "ltt-kconsumerd", verbosity
, NULL
);
1004 perror("kernel start consumer exec");
1007 } else if (pid
> 0) {
1011 perror("kernel start consumer fork");
1021 * Spawn the kconsumerd daemon and session daemon thread.
1023 static int start_kconsumerd(void)
1027 pthread_mutex_lock(&kconsumerd_pid_mutex
);
1028 if (kconsumerd_pid
!= 0) {
1029 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
1033 ret
= spawn_kconsumerd();
1035 ERR("Spawning kconsumerd failed");
1036 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1037 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
1041 /* Setting up the global kconsumerd_pid */
1042 kconsumerd_pid
= ret
;
1043 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
1045 DBG("Kconsumerd pid %d", ret
);
1047 DBG("Spawning kconsumerd thread");
1048 ret
= spawn_kconsumerd_thread();
1050 ERR("Fatal error spawning kconsumerd thread");
1062 * modprobe_kernel_modules
1064 static int modprobe_kernel_modules(void)
1069 for (i
= 0; i
< ARRAY_SIZE(kernel_modules_list
); i
++) {
1070 ret
= snprintf(modprobe
, sizeof(modprobe
),
1071 "/sbin/modprobe %s%s",
1072 kernel_modules_list
[i
].required
? "" : "--quiet ",
1073 kernel_modules_list
[i
].name
);
1075 perror("snprintf modprobe");
1078 modprobe
[sizeof(modprobe
) - 1] = '\0';
1079 ret
= system(modprobe
);
1081 ERR("Unable to launch modprobe for module %s",
1082 kernel_modules_list
[i
].name
);
1083 } else if (kernel_modules_list
[i
].required
1084 && WEXITSTATUS(ret
) != 0) {
1085 ERR("Unable to load module %s",
1086 kernel_modules_list
[i
].name
);
1088 DBG("Modprobe successfully %s",
1089 kernel_modules_list
[i
].name
);
1098 * modprobe_remove_kernel_modules
1099 * Remove modules in reverse load order.
1101 static int modprobe_remove_kernel_modules(void)
1106 for (i
= ARRAY_SIZE(kernel_modules_list
) - 1; i
>= 0; i
--) {
1107 ret
= snprintf(modprobe
, sizeof(modprobe
),
1108 "/sbin/modprobe --remove --quiet %s",
1109 kernel_modules_list
[i
].name
);
1111 perror("snprintf modprobe --remove");
1114 modprobe
[sizeof(modprobe
) - 1] = '\0';
1115 ret
= system(modprobe
);
1117 ERR("Unable to launch modprobe --remove for module %s",
1118 kernel_modules_list
[i
].name
);
1119 } else if (kernel_modules_list
[i
].required
1120 && WEXITSTATUS(ret
) != 0) {
1121 ERR("Unable to remove module %s",
1122 kernel_modules_list
[i
].name
);
1124 DBG("Modprobe removal successful %s",
1125 kernel_modules_list
[i
].name
);
1136 static int mount_debugfs(char *path
)
1139 char *type
= "debugfs";
1141 ret
= mkdir_recursive(path
, S_IRWXU
| S_IRWXG
, geteuid(), getegid());
1146 ret
= mount(type
, path
, type
, 0, NULL
);
1148 perror("mount debugfs");
1152 DBG("Mounted debugfs successfully at %s", path
);
1159 * Setup necessary data for kernel tracer action.
1161 static void init_kernel_tracer(void)
1164 char *proc_mounts
= "/proc/mounts";
1166 char *debugfs_path
= NULL
, *lttng_path
;
1169 /* Detect debugfs */
1170 fp
= fopen(proc_mounts
, "r");
1172 ERR("Unable to probe %s", proc_mounts
);
1176 while (fgets(line
, sizeof(line
), fp
) != NULL
) {
1177 if (strstr(line
, "debugfs") != NULL
) {
1178 /* Remove first string */
1180 /* Dup string here so we can reuse line later on */
1181 debugfs_path
= strdup(strtok(NULL
, " "));
1182 DBG("Got debugfs path : %s", debugfs_path
);
1189 /* Mount debugfs if needded */
1190 if (debugfs_path
== NULL
) {
1191 ret
= asprintf(&debugfs_path
, "/mnt/debugfs");
1193 perror("asprintf debugfs path");
1196 ret
= mount_debugfs(debugfs_path
);
1202 /* Modprobe lttng kernel modules */
1203 ret
= modprobe_kernel_modules();
1208 /* Setup lttng kernel path */
1209 ret
= asprintf(<tng_path
, "%s/lttng", debugfs_path
);
1211 perror("asprintf lttng path");
1215 /* Open debugfs lttng */
1216 kernel_tracer_fd
= open(lttng_path
, O_RDWR
);
1217 if (kernel_tracer_fd
< 0) {
1218 DBG("Failed to open %s", lttng_path
);
1224 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1234 WARN("No kernel tracer available");
1235 kernel_tracer_fd
= 0;
1240 * Start tracing by creating trace directory and sending FDs to the kernel
1243 static int start_kernel_trace(struct ltt_kernel_session
*session
)
1247 if (session
->kconsumer_fds_sent
== 0) {
1249 * Assign default kernel consumer if no consumer assigned to the kernel
1250 * session. At this point, it's NOT suppose to be 0 but this is an extra
1253 if (session
->consumer_fd
== 0) {
1254 session
->consumer_fd
= kconsumerd_cmd_sock
;
1257 ret
= send_kconsumerd_fds(session
);
1259 ERR("Send kconsumerd fds failed");
1260 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1264 session
->kconsumer_fds_sent
= 1;
1272 * Notify kernel thread to update it's pollfd.
1274 static int notify_kernel_pollfd(void)
1278 /* Inform kernel thread of the new kernel channel */
1279 ret
= write(kernel_poll_pipe
[1], "!", 1);
1281 perror("write kernel poll pipe");
1288 * Allocate a channel structure and fill it.
1290 static struct lttng_channel
*init_default_channel(enum lttng_domain_type domain_type
,
1293 struct lttng_channel
*chan
;
1295 chan
= malloc(sizeof(struct lttng_channel
));
1297 perror("init channel malloc");
1301 if (snprintf(chan
->name
, NAME_MAX
, "%s", name
) < 0) {
1302 perror("snprintf channel name");
1306 chan
->attr
.overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
1307 chan
->attr
.switch_timer_interval
= DEFAULT_CHANNEL_SWITCH_TIMER
;
1308 chan
->attr
.read_timer_interval
= DEFAULT_CHANNEL_READ_TIMER
;
1310 switch (domain_type
) {
1311 case LTTNG_DOMAIN_KERNEL
:
1312 chan
->attr
.subbuf_size
= DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE
;
1313 chan
->attr
.num_subbuf
= DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
;
1314 chan
->attr
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
1318 goto error
; /* Not implemented */
1329 * Create a kernel tracer session then create the default channel.
1331 static int create_kernel_session(struct ltt_session
*session
)
1335 DBG("Creating kernel session");
1337 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1339 ret
= LTTCOMM_KERN_SESS_FAIL
;
1343 /* Set kernel consumer socket fd */
1344 if (kconsumerd_cmd_sock
) {
1345 session
->kernel_session
->consumer_fd
= kconsumerd_cmd_sock
;
1348 ret
= asprintf(&session
->kernel_session
->trace_path
, "%s/kernel",
1351 perror("asprintf kernel traces path");
1355 ret
= mkdir_recursive(session
->kernel_session
->trace_path
,
1356 S_IRWXU
| S_IRWXG
, geteuid(), allowed_group());
1358 if (ret
!= -EEXIST
) {
1359 ERR("Trace directory creation error");
1369 * Using the session list, filled a lttng_session array to send back to the
1370 * client for session listing.
1372 * The session list lock MUST be acquired before calling this function. Use
1373 * lock_session_list() and unlock_session_list().
1375 static void list_lttng_sessions(struct lttng_session
*sessions
)
1378 struct ltt_session
*session
;
1380 DBG("Getting all available session");
1382 * Iterate over session list and append data after the control struct in
1385 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1386 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
1387 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
1388 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
1389 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
1395 * Fill lttng_channel array of all channels.
1397 static void list_lttng_channels(struct ltt_session
*session
,
1398 struct lttng_channel
*channels
)
1401 struct ltt_kernel_channel
*kchan
;
1403 DBG("Listing channels for session %s", session
->name
);
1405 /* Kernel channels */
1406 if (session
->kernel_session
!= NULL
) {
1407 cds_list_for_each_entry(kchan
, &session
->kernel_session
->channel_list
.head
, list
) {
1408 /* Copy lttng_channel struct to array */
1409 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
1410 channels
[i
].enabled
= kchan
->enabled
;
1415 /* TODO: Missing UST listing */
1419 * Fill lttng_event array of all events in the channel.
1421 static void list_lttng_events(struct ltt_kernel_channel
*kchan
,
1422 struct lttng_event
*events
)
1425 * TODO: This is ONLY kernel. Need UST support.
1428 struct ltt_kernel_event
*event
;
1430 DBG("Listing events for channel %s", kchan
->channel
->name
);
1432 /* Kernel channels */
1433 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
1434 strncpy(events
[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
1435 events
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1436 events
[i
].enabled
= event
->enabled
;
1437 switch (event
->event
->instrumentation
) {
1438 case LTTNG_KERNEL_TRACEPOINT
:
1439 events
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1441 case LTTNG_KERNEL_KPROBE
:
1442 case LTTNG_KERNEL_KRETPROBE
:
1443 events
[i
].type
= LTTNG_EVENT_PROBE
;
1444 memcpy(&events
[i
].attr
.probe
, &event
->event
->u
.kprobe
,
1445 sizeof(struct lttng_kernel_kprobe
));
1447 case LTTNG_KERNEL_FUNCTION
:
1448 events
[i
].type
= LTTNG_EVENT_FUNCTION
;
1449 memcpy(&events
[i
].attr
.ftrace
, &event
->event
->u
.ftrace
,
1450 sizeof(struct lttng_kernel_function
));
1458 * Process the command requested by the lttng client within the command
1459 * context structure. This function make sure that the return structure (llm)
1460 * is set and ready for transmission before returning.
1462 * Return any error encountered or 0 for success.
1464 static int process_client_msg(struct command_ctx
*cmd_ctx
)
1466 int ret
= LTTCOMM_OK
;
1468 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
1471 * Commands that DO NOT need a session.
1473 switch (cmd_ctx
->lsm
->cmd_type
) {
1474 case LTTNG_CREATE_SESSION
:
1475 case LTTNG_LIST_SESSIONS
:
1476 case LTTNG_LIST_TRACEPOINTS
:
1477 case LTTNG_CALIBRATE
:
1480 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
1481 cmd_ctx
->session
= find_session_by_name(cmd_ctx
->lsm
->session
.name
);
1482 if (cmd_ctx
->session
== NULL
) {
1483 /* If session name not found */
1484 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
1485 ret
= LTTCOMM_SESS_NOT_FOUND
;
1486 } else { /* If no session name specified */
1487 ret
= LTTCOMM_SELECT_SESS
;
1491 /* Acquire lock for the session */
1492 lock_session(cmd_ctx
->session
);
1498 * Check domain type for specific "pre-action".
1500 switch (cmd_ctx
->lsm
->domain
.type
) {
1501 case LTTNG_DOMAIN_KERNEL
:
1502 /* Kernel tracer check */
1503 if (kernel_tracer_fd
== 0) {
1504 init_kernel_tracer();
1505 if (kernel_tracer_fd
== 0) {
1506 ret
= LTTCOMM_KERN_NA
;
1511 /* Need a session for kernel command */
1512 switch (cmd_ctx
->lsm
->cmd_type
) {
1513 case LTTNG_CALIBRATE
:
1514 case LTTNG_CREATE_SESSION
:
1515 case LTTNG_LIST_SESSIONS
:
1516 case LTTNG_LIST_TRACEPOINTS
:
1519 if (cmd_ctx
->session
->kernel_session
== NULL
) {
1520 ret
= create_kernel_session(cmd_ctx
->session
);
1522 ret
= LTTCOMM_KERN_SESS_FAIL
;
1526 /* Start the kernel consumer daemon */
1528 if (kconsumerd_pid
== 0 &&
1529 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
1530 ret
= start_kconsumerd();
1542 /* Process by command type */
1543 switch (cmd_ctx
->lsm
->cmd_type
) {
1544 case LTTNG_ADD_CONTEXT
:
1546 struct lttng_kernel_context kctx
;
1548 /* Setup lttng message with no payload */
1549 ret
= setup_lttng_msg(cmd_ctx
, 0);
1554 switch (cmd_ctx
->lsm
->domain
.type
) {
1555 case LTTNG_DOMAIN_KERNEL
:
1556 /* Create Kernel context */
1557 kctx
.ctx
= cmd_ctx
->lsm
->u
.context
.ctx
.ctx
;
1558 kctx
.u
.perf_counter
.type
= cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.type
;
1559 kctx
.u
.perf_counter
.config
= cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.config
;
1560 strncpy(kctx
.u
.perf_counter
.name
,
1561 cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.name
,
1562 LTTNG_SYMBOL_NAME_LEN
);
1563 kctx
.u
.perf_counter
.name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1565 /* Add kernel context to kernel tracer. See context.c */
1566 ret
= add_kernel_context(cmd_ctx
->session
->kernel_session
, &kctx
,
1567 cmd_ctx
->lsm
->u
.context
.event_name
,
1568 cmd_ctx
->lsm
->u
.context
.channel_name
);
1569 if (ret
!= LTTCOMM_OK
) {
1574 /* TODO: Userspace tracing */
1575 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1582 case LTTNG_DISABLE_CHANNEL
:
1584 struct ltt_kernel_channel
*kchan
;
1586 /* Setup lttng message with no payload */
1587 ret
= setup_lttng_msg(cmd_ctx
, 0);
1592 switch (cmd_ctx
->lsm
->domain
.type
) {
1593 case LTTNG_DOMAIN_KERNEL
:
1594 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1595 cmd_ctx
->session
->kernel_session
);
1596 if (kchan
== NULL
) {
1597 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1599 } else if (kchan
->enabled
== 1) {
1600 ret
= kernel_disable_channel(kchan
);
1602 if (ret
!= EEXIST
) {
1603 ret
= LTTCOMM_KERN_CHAN_DISABLE_FAIL
;
1608 kernel_wait_quiescent(kernel_tracer_fd
);
1611 /* TODO: Userspace tracing */
1612 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1619 case LTTNG_DISABLE_EVENT
:
1621 struct ltt_kernel_channel
*kchan
;
1622 struct ltt_kernel_event
*kevent
;
1624 /* Setup lttng message with no payload */
1625 ret
= setup_lttng_msg(cmd_ctx
, 0);
1630 switch (cmd_ctx
->lsm
->domain
.type
) {
1631 case LTTNG_DOMAIN_KERNEL
:
1632 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1633 cmd_ctx
->session
->kernel_session
);
1634 if (kchan
== NULL
) {
1635 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1639 kevent
= get_kernel_event_by_name(cmd_ctx
->lsm
->u
.disable
.name
, kchan
);
1640 if (kevent
!= NULL
) {
1641 DBG("Disabling kernel event %s for channel %s.", kevent
->event
->name
,
1642 kchan
->channel
->name
);
1643 ret
= kernel_disable_event(kevent
);
1645 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
1650 kernel_wait_quiescent(kernel_tracer_fd
);
1653 /* TODO: Userspace tracing */
1654 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1661 case LTTNG_DISABLE_ALL_EVENT
:
1663 struct ltt_kernel_channel
*kchan
;
1664 struct ltt_kernel_event
*kevent
;
1666 /* Setup lttng message with no payload */
1667 ret
= setup_lttng_msg(cmd_ctx
, 0);
1672 switch (cmd_ctx
->lsm
->domain
.type
) {
1673 case LTTNG_DOMAIN_KERNEL
:
1674 DBG("Disabling all enabled kernel events");
1675 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1676 cmd_ctx
->session
->kernel_session
);
1677 if (kchan
== NULL
) {
1678 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1682 /* For each event in the kernel session */
1683 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
1684 DBG("Disabling kernel event %s for channel %s.",
1685 kevent
->event
->name
, kchan
->channel
->name
);
1686 ret
= kernel_disable_event(kevent
);
1692 /* Quiescent wait after event disable */
1693 kernel_wait_quiescent(kernel_tracer_fd
);
1696 /* TODO: Userspace tracing */
1697 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1704 case LTTNG_ENABLE_CHANNEL
:
1706 struct ltt_kernel_channel
*kchan
;
1708 /* Setup lttng message with no payload */
1709 ret
= setup_lttng_msg(cmd_ctx
, 0);
1714 switch (cmd_ctx
->lsm
->domain
.type
) {
1715 case LTTNG_DOMAIN_KERNEL
:
1716 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.enable
.channel_name
,
1717 cmd_ctx
->session
->kernel_session
);
1718 if (kchan
== NULL
) {
1719 /* Channel not found, creating it */
1720 DBG("Creating kernel channel");
1722 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1723 &cmd_ctx
->lsm
->u
.channel
.chan
,
1724 cmd_ctx
->session
->kernel_session
->trace_path
);
1726 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1730 /* Notify kernel thread that there is a new channel */
1731 ret
= notify_kernel_pollfd();
1733 ret
= LTTCOMM_FATAL
;
1736 } else if (kchan
->enabled
== 0) {
1737 ret
= kernel_enable_channel(kchan
);
1739 if (ret
!= EEXIST
) {
1740 ret
= LTTCOMM_KERN_CHAN_ENABLE_FAIL
;
1746 kernel_wait_quiescent(kernel_tracer_fd
);
1749 /* TODO: Userspace tracing */
1750 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1757 case LTTNG_ENABLE_EVENT
:
1760 struct ltt_kernel_channel
*kchan
;
1761 struct ltt_kernel_event
*kevent
;
1762 struct lttng_channel
*chan
;
1764 /* Setup lttng message with no payload */
1765 ret
= setup_lttng_msg(cmd_ctx
, 0);
1770 channel_name
= cmd_ctx
->lsm
->u
.enable
.channel_name
;
1772 switch (cmd_ctx
->lsm
->domain
.type
) {
1773 case LTTNG_DOMAIN_KERNEL
:
1774 kchan
= get_kernel_channel_by_name(channel_name
,
1775 cmd_ctx
->session
->kernel_session
);
1776 if (kchan
== NULL
) {
1777 DBG("Channel not found. Creating channel %s", channel_name
);
1779 chan
= init_default_channel(cmd_ctx
->lsm
->domain
.type
, channel_name
);
1781 ret
= LTTCOMM_FATAL
;
1785 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1786 chan
, cmd_ctx
->session
->kernel_session
->trace_path
);
1788 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1791 kchan
= get_kernel_channel_by_name(channel_name
,
1792 cmd_ctx
->session
->kernel_session
);
1793 if (kchan
== NULL
) {
1794 ERR("Channel %s not found after creation. Internal error, giving up.",
1796 ret
= LTTCOMM_FATAL
;
1801 kevent
= get_kernel_event_by_name(cmd_ctx
->lsm
->u
.enable
.event
.name
, kchan
);
1802 if (kevent
== NULL
) {
1803 DBG("Creating kernel event %s for channel %s.",
1804 cmd_ctx
->lsm
->u
.enable
.event
.name
, channel_name
);
1805 ret
= kernel_create_event(&cmd_ctx
->lsm
->u
.enable
.event
, kchan
);
1807 DBG("Enabling kernel event %s for channel %s.",
1808 kevent
->event
->name
, channel_name
);
1809 ret
= kernel_enable_event(kevent
);
1810 if (ret
== -EEXIST
) {
1811 ret
= LTTCOMM_KERN_EVENT_EXIST
;
1817 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
1821 kernel_wait_quiescent(kernel_tracer_fd
);
1824 /* TODO: Userspace tracing */
1825 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1831 case LTTNG_ENABLE_ALL_EVENT
:
1835 struct ltt_kernel_channel
*kchan
;
1836 struct ltt_kernel_event
*kevent
;
1837 struct lttng_event
*event_list
;
1838 struct lttng_channel
*chan
;
1840 /* Setup lttng message with no payload */
1841 ret
= setup_lttng_msg(cmd_ctx
, 0);
1846 DBG("Enabling all kernel event");
1848 channel_name
= cmd_ctx
->lsm
->u
.enable
.channel_name
;
1850 switch (cmd_ctx
->lsm
->domain
.type
) {
1851 case LTTNG_DOMAIN_KERNEL
:
1852 kchan
= get_kernel_channel_by_name(channel_name
,
1853 cmd_ctx
->session
->kernel_session
);
1854 if (kchan
== NULL
) {
1855 DBG("Channel not found. Creating channel %s", channel_name
);
1857 chan
= init_default_channel(cmd_ctx
->lsm
->domain
.type
, channel_name
);
1859 ret
= LTTCOMM_FATAL
;
1863 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1864 chan
, cmd_ctx
->session
->kernel_session
->trace_path
);
1866 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1869 kchan
= get_kernel_channel_by_name(channel_name
,
1870 cmd_ctx
->session
->kernel_session
);
1871 if (kchan
== NULL
) {
1872 ERR("Channel %s not found after creation. Internal error, giving up.",
1874 ret
= LTTCOMM_FATAL
;
1879 /* For each event in the kernel session */
1880 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
1881 DBG("Enabling kernel event %s for channel %s.",
1882 kevent
->event
->name
, channel_name
);
1883 ret
= kernel_enable_event(kevent
);
1889 size
= kernel_list_events(kernel_tracer_fd
, &event_list
);
1891 ret
= LTTCOMM_KERN_LIST_FAIL
;
1895 for (i
= 0; i
< size
; i
++) {
1896 kevent
= get_kernel_event_by_name(event_list
[i
].name
, kchan
);
1897 if (kevent
== NULL
) {
1898 /* Default event type for enable all */
1899 event_list
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1900 /* Enable each single tracepoint event */
1901 ret
= kernel_create_event(&event_list
[i
], kchan
);
1903 /* Ignore error here and continue */
1910 /* Quiescent wait after event enable */
1911 kernel_wait_quiescent(kernel_tracer_fd
);
1914 /* TODO: Userspace tracing */
1915 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1922 case LTTNG_LIST_TRACEPOINTS
:
1924 struct lttng_event
*events
;
1925 ssize_t nb_events
= 0;
1927 switch (cmd_ctx
->lsm
->domain
.type
) {
1928 case LTTNG_DOMAIN_KERNEL
:
1929 DBG("Listing kernel events");
1930 nb_events
= kernel_list_events(kernel_tracer_fd
, &events
);
1931 if (nb_events
< 0) {
1932 ret
= LTTCOMM_KERN_LIST_FAIL
;
1937 /* TODO: Userspace listing */
1938 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1943 * Setup lttng message with payload size set to the event list size in
1944 * bytes and then copy list into the llm payload.
1946 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
1952 /* Copy event list into message payload */
1953 memcpy(cmd_ctx
->llm
->payload
, events
,
1954 sizeof(struct lttng_event
) * nb_events
);
1961 case LTTNG_START_TRACE
:
1963 struct ltt_kernel_channel
*chan
;
1965 /* Setup lttng message with no payload */
1966 ret
= setup_lttng_msg(cmd_ctx
, 0);
1971 /* Kernel tracing */
1972 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
1973 if (cmd_ctx
->session
->kernel_session
->metadata
== NULL
) {
1974 DBG("Open kernel metadata");
1975 ret
= kernel_open_metadata(cmd_ctx
->session
->kernel_session
,
1976 cmd_ctx
->session
->kernel_session
->trace_path
);
1978 ret
= LTTCOMM_KERN_META_FAIL
;
1983 if (cmd_ctx
->session
->kernel_session
->metadata_stream_fd
== 0) {
1984 DBG("Opening kernel metadata stream");
1985 if (cmd_ctx
->session
->kernel_session
->metadata_stream_fd
== 0) {
1986 ret
= kernel_open_metadata_stream(cmd_ctx
->session
->kernel_session
);
1988 ERR("Kernel create metadata stream failed");
1989 ret
= LTTCOMM_KERN_STREAM_FAIL
;
1995 /* For each channel */
1996 cds_list_for_each_entry(chan
,
1997 &cmd_ctx
->session
->kernel_session
->channel_list
.head
, list
) {
1998 if (chan
->stream_count
== 0) {
1999 ret
= kernel_open_channel_stream(chan
);
2001 ERR("Kernel create channel stream failed");
2002 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2005 /* Update the stream global counter */
2006 cmd_ctx
->session
->kernel_session
->stream_count_global
+= ret
;
2010 ret
= start_kernel_trace(cmd_ctx
->session
->kernel_session
);
2012 ret
= LTTCOMM_KERN_START_FAIL
;
2016 DBG("Start kernel tracing");
2017 ret
= kernel_start_session(cmd_ctx
->session
->kernel_session
);
2019 ERR("Kernel start session failed");
2020 ret
= LTTCOMM_KERN_START_FAIL
;
2024 /* Quiescent wait after starting trace */
2025 kernel_wait_quiescent(kernel_tracer_fd
);
2028 /* TODO: Start all UST traces */
2033 case LTTNG_STOP_TRACE
:
2035 struct ltt_kernel_channel
*chan
;
2036 /* Setup lttng message with no payload */
2037 ret
= setup_lttng_msg(cmd_ctx
, 0);
2043 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2044 DBG("Stop kernel tracing");
2046 ret
= kernel_metadata_flush_buffer(cmd_ctx
->session
->kernel_session
->metadata_stream_fd
);
2048 ERR("Kernel metadata flush failed");
2051 cds_list_for_each_entry(chan
, &cmd_ctx
->session
->kernel_session
->channel_list
.head
, list
) {
2052 ret
= kernel_flush_buffer(chan
);
2054 ERR("Kernel flush buffer error");
2058 ret
= kernel_stop_session(cmd_ctx
->session
->kernel_session
);
2060 ERR("Kernel stop session failed");
2061 ret
= LTTCOMM_KERN_STOP_FAIL
;
2065 /* Quiescent wait after stopping trace */
2066 kernel_wait_quiescent(kernel_tracer_fd
);
2069 /* TODO : User-space tracer */
2074 case LTTNG_CREATE_SESSION
:
2076 /* Setup lttng message with no payload */
2077 ret
= setup_lttng_msg(cmd_ctx
, 0);
2082 tracepoint(create_session_start
);
2083 ret
= create_session(cmd_ctx
->lsm
->session
.name
, cmd_ctx
->lsm
->session
.path
);
2084 tracepoint(create_session_end
);
2086 if (ret
== -EEXIST
) {
2087 ret
= LTTCOMM_EXIST_SESS
;
2089 ret
= LTTCOMM_FATAL
;
2097 case LTTNG_DESTROY_SESSION
:
2099 /* Setup lttng message with no payload */
2100 ret
= setup_lttng_msg(cmd_ctx
, 0);
2105 /* Clean kernel session teardown */
2106 teardown_kernel_session(cmd_ctx
->session
);
2108 tracepoint(destroy_session_start
);
2109 ret
= destroy_session(cmd_ctx
->lsm
->session
.name
);
2110 tracepoint(destroy_session_end
);
2112 ret
= LTTCOMM_FATAL
;
2117 * Must notify the kernel thread here to update it's pollfd in order to
2118 * remove the channel(s)' fd just destroyed.
2120 ret
= notify_kernel_pollfd();
2122 ret
= LTTCOMM_FATAL
;
2129 case LTTNG_LIST_DOMAINS
:
2133 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2137 nb_dom
+= cmd_ctx
->session
->ust_trace_count
;
2139 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_domain
) * nb_dom
);
2144 ((struct lttng_domain
*)(cmd_ctx
->llm
->payload
))[0].type
=
2145 LTTNG_DOMAIN_KERNEL
;
2147 /* TODO: User-space tracer domain support */
2151 case LTTNG_LIST_CHANNELS
:
2154 * TODO: Only kernel channels are listed here. UST listing
2155 * is needed on lttng-ust 2.0 release.
2158 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2159 nb_chan
+= cmd_ctx
->session
->kernel_session
->channel_count
;
2162 ret
= setup_lttng_msg(cmd_ctx
,
2163 sizeof(struct lttng_channel
) * nb_chan
);
2168 list_lttng_channels(cmd_ctx
->session
,
2169 (struct lttng_channel
*)(cmd_ctx
->llm
->payload
));
2174 case LTTNG_LIST_EVENTS
:
2177 * TODO: Only kernel events are listed here. UST listing
2178 * is needed on lttng-ust 2.0 release.
2180 size_t nb_event
= 0;
2181 struct ltt_kernel_channel
*kchan
= NULL
;
2183 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2184 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.list
.channel_name
,
2185 cmd_ctx
->session
->kernel_session
);
2186 if (kchan
== NULL
) {
2187 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2190 nb_event
+= kchan
->event_count
;
2193 ret
= setup_lttng_msg(cmd_ctx
,
2194 sizeof(struct lttng_event
) * nb_event
);
2199 DBG("Listing events (%zu events)", nb_event
);
2201 list_lttng_events(kchan
,
2202 (struct lttng_event
*)(cmd_ctx
->llm
->payload
));
2207 case LTTNG_LIST_SESSIONS
:
2209 lock_session_list();
2211 if (session_list_ptr
->count
== 0) {
2212 ret
= LTTCOMM_NO_SESSION
;
2213 unlock_session_list();
2217 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) *
2218 session_list_ptr
->count
);
2220 unlock_session_list();
2224 /* Filled the session array */
2225 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
));
2227 unlock_session_list();
2232 case LTTNG_CALIBRATE
:
2234 /* Setup lttng message with no payload */
2235 ret
= setup_lttng_msg(cmd_ctx
, 0);
2240 switch (cmd_ctx
->lsm
->domain
.type
) {
2241 case LTTNG_DOMAIN_KERNEL
:
2243 struct lttng_kernel_calibrate kcalibrate
;
2245 kcalibrate
.type
= cmd_ctx
->lsm
->u
.calibrate
.type
;
2246 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2248 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2254 /* TODO: Userspace tracing */
2255 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2261 case LTTNG_REGISTER_CONSUMER
:
2265 /* Setup lttng message with no payload */
2266 ret
= setup_lttng_msg(cmd_ctx
, 0);
2271 switch (cmd_ctx
->lsm
->domain
.type
) {
2272 case LTTNG_DOMAIN_KERNEL
:
2274 /* Can't register a consumer if there is already one */
2275 if (cmd_ctx
->session
->kernel_session
->consumer_fd
!= 0) {
2276 ret
= LTTCOMM_CONNECT_FAIL
;
2280 sock
= lttcomm_connect_unix_sock(cmd_ctx
->lsm
->u
.reg
.path
);
2282 ret
= LTTCOMM_CONNECT_FAIL
;
2286 cmd_ctx
->session
->kernel_session
->consumer_fd
= sock
;
2290 /* TODO: Userspace tracing */
2291 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2300 /* Undefined command */
2301 ret
= setup_lttng_msg(cmd_ctx
, 0);
2310 /* Set return code */
2311 cmd_ctx
->llm
->ret_code
= ret
;
2313 if (cmd_ctx
->session
) {
2314 unlock_session(cmd_ctx
->session
);
2320 if (cmd_ctx
->llm
== NULL
) {
2321 DBG("Missing llm structure. Allocating one.");
2322 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
2326 /* Notify client of error */
2327 cmd_ctx
->llm
->ret_code
= ret
;
2330 if (cmd_ctx
->session
) {
2331 unlock_session(cmd_ctx
->session
);
2337 * This thread manage all clients request using the unix client socket for
2340 static void *thread_manage_clients(void *data
)
2343 struct command_ctx
*cmd_ctx
= NULL
;
2344 struct pollfd pollfd
[2];
2346 tracepoint(sessiond_th_cli_start
);
2348 DBG("[thread] Manage client started");
2350 ret
= lttcomm_listen_unix_sock(client_sock
);
2355 /* First fd is always the quit pipe */
2356 pollfd
[0].fd
= thread_quit_pipe
[0];
2359 pollfd
[1].fd
= client_sock
;
2360 pollfd
[1].events
= POLLIN
;
2362 /* Notify parent pid that we are ready
2363 * to accept command for client side.
2365 if (opt_sig_parent
) {
2366 kill(ppid
, SIGCHLD
);
2370 DBG("Accepting client command ...");
2372 tracepoint(sessiond_th_cli_poll
);
2374 /* Inifinite blocking call, waiting for transmission */
2375 ret
= poll(pollfd
, 2, -1);
2377 perror("poll client thread");
2381 /* Thread quit pipe has been closed. Killing thread. */
2382 if (pollfd
[0].revents
== POLLNVAL
) {
2384 } else if (pollfd
[1].revents
== POLLERR
) {
2385 ERR("Client socket poll error");
2389 sock
= lttcomm_accept_unix_sock(client_sock
);
2394 /* Allocate context command to process the client request */
2395 cmd_ctx
= malloc(sizeof(struct command_ctx
));
2397 /* Allocate data buffer for reception */
2398 cmd_ctx
->lsm
= malloc(sizeof(struct lttcomm_session_msg
));
2399 cmd_ctx
->llm
= NULL
;
2400 cmd_ctx
->session
= NULL
;
2403 * Data is received from the lttng client. The struct
2404 * lttcomm_session_msg (lsm) contains the command and data request of
2407 DBG("Receiving data from client ...");
2408 ret
= lttcomm_recv_unix_sock(sock
, cmd_ctx
->lsm
, sizeof(struct lttcomm_session_msg
));
2413 // TODO: Validate cmd_ctx including sanity check for security purpose.
2416 * This function dispatch the work to the kernel or userspace tracer
2417 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2418 * informations for the client. The command context struct contains
2419 * everything this function may needs.
2421 ret
= process_client_msg(cmd_ctx
);
2423 /* TODO: Inform client somehow of the fatal error. At this point,
2424 * ret < 0 means that a malloc failed (ENOMEM). */
2425 /* Error detected but still accept command */
2426 clean_command_ctx(&cmd_ctx
);
2430 DBG("Sending response (size: %d, retcode: %d)",
2431 cmd_ctx
->lttng_msg_size
, cmd_ctx
->llm
->ret_code
);
2432 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
2434 ERR("Failed to send data back to client");
2437 clean_command_ctx(&cmd_ctx
);
2439 /* End of transmission */
2444 DBG("Client thread dying");
2452 unlink(client_unix_sock_path
);
2454 clean_command_ctx(&cmd_ctx
);
2460 * usage function on stderr
2462 static void usage(void)
2464 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
2465 fprintf(stderr
, " -h, --help Display this usage.\n");
2466 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
2467 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
2468 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
2469 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
2470 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
2471 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
2472 fprintf(stderr
, " -V, --version Show version number.\n");
2473 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
2474 fprintf(stderr
, " -q, --quiet No output at all.\n");
2475 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
2476 fprintf(stderr
, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n");
2480 * daemon argument parsing
2482 static int parse_args(int argc
, char **argv
)
2486 static struct option long_options
[] = {
2487 { "client-sock", 1, 0, 'c' },
2488 { "apps-sock", 1, 0, 'a' },
2489 { "kconsumerd-cmd-sock", 1, 0, 0 },
2490 { "kconsumerd-err-sock", 1, 0, 0 },
2491 { "daemonize", 0, 0, 'd' },
2492 { "sig-parent", 0, 0, 'S' },
2493 { "help", 0, 0, 'h' },
2494 { "group", 1, 0, 'g' },
2495 { "version", 0, 0, 'V' },
2496 { "quiet", 0, 0, 'q' },
2497 { "verbose", 0, 0, 'v' },
2498 { "verbose-kconsumerd", 0, 0, 'Z' },
2503 int option_index
= 0;
2504 c
= getopt_long(argc
, argv
, "dhqvVS" "a:c:g:s:E:C:Z", long_options
, &option_index
);
2511 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
2513 fprintf(stderr
, " with arg %s\n", optarg
);
2517 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2520 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2526 opt_tracing_group
= strdup(optarg
);
2532 fprintf(stdout
, "%s\n", VERSION
);
2538 snprintf(kconsumerd_err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2541 snprintf(kconsumerd_cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2547 /* Verbose level can increase using multiple -v */
2551 opt_verbose_kconsumerd
+= 1;
2554 /* Unknown option or other error.
2555 * Error is printed by getopt, just return */
2564 * Creates the two needed socket by the daemon.
2565 * apps_sock - The communication socket for all UST apps.
2566 * client_sock - The communication of the cli tool (lttng).
2568 static int init_daemon_socket(void)
2573 old_umask
= umask(0);
2575 /* Create client tool unix socket */
2576 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
2577 if (client_sock
< 0) {
2578 ERR("Create unix sock failed: %s", client_unix_sock_path
);
2583 /* File permission MUST be 660 */
2584 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
2586 ERR("Set file permissions failed: %s", client_unix_sock_path
);
2591 /* Create the application unix socket */
2592 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
2593 if (apps_sock
< 0) {
2594 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
2599 /* File permission MUST be 666 */
2600 ret
= chmod(apps_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
2602 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
2613 * Check if the global socket is available, and if a daemon is answering
2614 * at the other side. If yes, error is returned.
2616 static int check_existing_daemon(void)
2618 if (access(client_unix_sock_path
, F_OK
) < 0 &&
2619 access(apps_unix_sock_path
, F_OK
) < 0)
2621 /* Is there anybody out there ? */
2622 if (lttng_session_daemon_alive())
2629 * Set the tracing group gid onto the client socket.
2631 * Race window between mkdir and chown is OK because we are going from more
2632 * permissive (root.root) to les permissive (root.tracing).
2634 static int set_permissions(void)
2639 gid
= allowed_group();
2642 WARN("No tracing group detected");
2645 ERR("Missing tracing group. Aborting execution.");
2651 /* Set lttng run dir */
2652 ret
= chown(LTTNG_RUNDIR
, 0, gid
);
2654 ERR("Unable to set group on " LTTNG_RUNDIR
);
2658 /* lttng client socket path */
2659 ret
= chown(client_unix_sock_path
, 0, gid
);
2661 ERR("Unable to set group on %s", client_unix_sock_path
);
2665 /* kconsumerd error socket path */
2666 ret
= chown(kconsumerd_err_unix_sock_path
, 0, gid
);
2668 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path
);
2672 DBG("All permissions are set");
2679 * Create the pipe used to wake up the kernel thread.
2681 static int create_kernel_poll_pipe(void)
2683 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
2687 * Create the lttng run directory needed for all global sockets and pipe.
2689 static int create_lttng_rundir(void)
2693 ret
= mkdir(LTTNG_RUNDIR
, S_IRWXU
| S_IRWXG
);
2695 if (errno
!= EEXIST
) {
2696 ERR("Unable to create " LTTNG_RUNDIR
);
2708 * Setup sockets and directory needed by the kconsumerd communication with the
2711 static int set_kconsumerd_sockets(void)
2715 if (strlen(kconsumerd_err_unix_sock_path
) == 0) {
2716 snprintf(kconsumerd_err_unix_sock_path
, PATH_MAX
, KCONSUMERD_ERR_SOCK_PATH
);
2719 if (strlen(kconsumerd_cmd_unix_sock_path
) == 0) {
2720 snprintf(kconsumerd_cmd_unix_sock_path
, PATH_MAX
, KCONSUMERD_CMD_SOCK_PATH
);
2723 ret
= mkdir(KCONSUMERD_PATH
, S_IRWXU
| S_IRWXG
);
2725 if (errno
!= EEXIST
) {
2726 ERR("Failed to create " KCONSUMERD_PATH
);
2732 /* Create the kconsumerd error unix socket */
2733 kconsumerd_err_sock
= lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path
);
2734 if (kconsumerd_err_sock
< 0) {
2735 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path
);
2740 /* File permission MUST be 660 */
2741 ret
= chmod(kconsumerd_err_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
2743 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path
);
2753 * Signal handler for the daemon
2755 * Simply stop all worker threads, leaving main() return gracefully
2756 * after joining all threads and calling cleanup().
2758 static void sighandler(int sig
)
2762 DBG("SIGPIPE catched");
2765 DBG("SIGINT catched");
2769 DBG("SIGTERM catched");
2778 * Setup signal handler for :
2779 * SIGINT, SIGTERM, SIGPIPE
2781 static int set_signal_handler(void)
2784 struct sigaction sa
;
2787 if ((ret
= sigemptyset(&sigset
)) < 0) {
2788 perror("sigemptyset");
2792 sa
.sa_handler
= sighandler
;
2793 sa
.sa_mask
= sigset
;
2795 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
2796 perror("sigaction");
2800 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
2801 perror("sigaction");
2805 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
2806 perror("sigaction");
2810 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
2816 * Set open files limit to unlimited. This daemon can open a large number of
2817 * file descriptors in order to consumer multiple kernel traces.
2819 static void set_ulimit(void)
2824 /* The kernel does not allowed an infinite limit for open files */
2825 lim
.rlim_cur
= 65535;
2826 lim
.rlim_max
= 65535;
2828 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
2830 perror("failed to set open files limit");
2837 int main(int argc
, char **argv
)
2841 const char *home_path
;
2843 tracepoint(sessiond_boot_start
);
2845 /* Create thread quit pipe */
2846 if ((ret
= init_thread_quit_pipe()) < 0) {
2850 /* Parse arguments */
2852 if ((ret
= parse_args(argc
, argv
) < 0)) {
2865 /* Check if daemon is UID = 0 */
2866 is_root
= !getuid();
2869 ret
= create_lttng_rundir();
2874 if (strlen(apps_unix_sock_path
) == 0) {
2875 snprintf(apps_unix_sock_path
, PATH_MAX
,
2876 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
2879 if (strlen(client_unix_sock_path
) == 0) {
2880 snprintf(client_unix_sock_path
, PATH_MAX
,
2881 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
2884 home_path
= get_home_dir();
2885 if (home_path
== NULL
) {
2886 /* TODO: Add --socket PATH option */
2887 ERR("Can't get HOME directory for sockets creation.");
2892 if (strlen(apps_unix_sock_path
) == 0) {
2893 snprintf(apps_unix_sock_path
, PATH_MAX
,
2894 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
2897 /* Set the cli tool unix socket path */
2898 if (strlen(client_unix_sock_path
) == 0) {
2899 snprintf(client_unix_sock_path
, PATH_MAX
,
2900 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
2904 DBG("Client socket path %s", client_unix_sock_path
);
2905 DBG("Application socket path %s", apps_unix_sock_path
);
2908 * See if daemon already exist.
2910 if ((ret
= check_existing_daemon()) < 0) {
2911 ERR("Already running daemon.\n");
2913 * We do not goto exit because we must not cleanup()
2914 * because a daemon is already running.
2919 /* After this point, we can safely call cleanup() so goto error is used */
2922 * These actions must be executed as root. We do that *after* setting up
2923 * the sockets path because we MUST make the check for another daemon using
2924 * those paths *before* trying to set the kernel consumer sockets and init
2928 ret
= set_kconsumerd_sockets();
2933 /* Setup kernel tracer */
2934 init_kernel_tracer();
2936 /* Set ulimit for open files */
2940 if ((ret
= set_signal_handler()) < 0) {
2944 /* Setup the needed unix socket */
2945 if ((ret
= init_daemon_socket()) < 0) {
2949 /* Set credentials to socket */
2950 if (is_root
&& ((ret
= set_permissions()) < 0)) {
2954 /* Get parent pid if -S, --sig-parent is specified. */
2955 if (opt_sig_parent
) {
2959 /* Setup the kernel pipe for waking up the kernel thread */
2960 if ((ret
= create_kernel_poll_pipe()) < 0) {
2965 * Get session list pointer. This pointer MUST NOT be free().
2966 * This list is statically declared in session.c
2968 session_list_ptr
= get_session_list();
2970 /* Create thread to manage the client socket */
2971 ret
= pthread_create(&client_thread
, NULL
, thread_manage_clients
, (void *) NULL
);
2973 perror("pthread_create");
2977 /* Create thread to manage application socket */
2978 ret
= pthread_create(&apps_thread
, NULL
, thread_manage_apps
, (void *) NULL
);
2980 perror("pthread_create");
2984 /* Create kernel thread to manage kernel event */
2985 ret
= pthread_create(&kernel_thread
, NULL
, thread_manage_kernel
, (void *) NULL
);
2987 perror("pthread_create");
2991 tracepoint(sessiond_boot_end
);
2993 ret
= pthread_join(kernel_thread
, &status
);
2995 perror("pthread_join");
2996 goto error
; /* join error, exit without cleanup */
3000 ret
= pthread_join(apps_thread
, &status
);
3002 perror("pthread_join");
3003 goto error
; /* join error, exit without cleanup */
3007 ret
= pthread_join(client_thread
, &status
);
3009 perror("pthread_join");
3010 goto error
; /* join error, exit without cleanup */
3013 ret
= join_kconsumerd_thread();
3015 perror("join_kconsumerd");
3016 goto error
; /* join error, exit without cleanup */
3022 * cleanup() is called when no other thread is running.