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 /* Kconsumerd err socket */
758 pollfd
[1].events
= POLLIN
;
760 /* Inifinite blocking call, waiting for transmission */
761 ret
= poll(pollfd
, 2, -1);
763 perror("poll kconsumerd thread");
767 /* Thread quit pipe has been closed. Killing thread. */
768 if (pollfd
[0].revents
== POLLNVAL
) {
770 } else if (pollfd
[1].revents
== POLLERR
) {
771 ERR("Kconsumerd err socket second poll error");
775 /* Wait for any kconsumerd error */
776 ret
= lttcomm_recv_unix_sock(sock
, &code
, sizeof(enum lttcomm_return_code
));
778 ERR("Kconsumerd closed the command socket");
782 ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code
));
785 DBG("Kconsumerd thread dying");
786 if (kconsumerd_err_sock
) {
787 close(kconsumerd_err_sock
);
789 if (kconsumerd_cmd_sock
) {
790 close(kconsumerd_cmd_sock
);
796 unlink(kconsumerd_err_unix_sock_path
);
797 unlink(kconsumerd_cmd_unix_sock_path
);
804 * This thread manage the application socket communication
806 static void *thread_manage_apps(void *data
)
809 struct pollfd pollfd
[2];
811 /* TODO: Something more elegant is needed but fine for now */
812 /* FIXME: change all types to either uint8_t, uint32_t, uint64_t
813 * for 32-bit vs 64-bit compat processes. */
814 /* replicate in ust with version number */
816 int reg
; /* 1:register, 0:unregister */
821 DBG("[thread] Manage apps started");
823 ret
= lttcomm_listen_unix_sock(apps_sock
);
828 /* First fd is always the quit pipe */
829 pollfd
[0].fd
= thread_quit_pipe
[0];
832 pollfd
[1].fd
= apps_sock
;
833 pollfd
[1].events
= POLLIN
;
835 /* Notify all applications to register */
836 notify_apps(default_global_apps_pipe
);
839 DBG("Accepting application registration");
841 /* Inifinite blocking call, waiting for transmission */
842 ret
= poll(pollfd
, 2, -1);
844 perror("poll apps thread");
848 /* Thread quit pipe has been closed. Killing thread. */
849 if (pollfd
[0].revents
== POLLNVAL
) {
851 } else if (pollfd
[1].revents
== POLLERR
) {
852 ERR("Apps socket poll error");
856 sock
= lttcomm_accept_unix_sock(apps_sock
);
862 * Using message-based transmissions to ensure we don't
863 * have to deal with partially received messages.
865 ret
= lttcomm_recv_unix_sock(sock
, ®_msg
, sizeof(reg_msg
));
871 /* Add application to the global traceable list */
872 if (reg_msg
.reg
== 1) {
875 * TODO: socket should be either passed to a
876 * listener thread (for more messages) or
877 * closed. It currently leaks.
879 ret
= register_traceable_app(reg_msg
.pid
, reg_msg
.uid
);
881 /* register_traceable_app only return an error with
882 * ENOMEM. At this point, we better stop everything.
888 unregister_traceable_app(reg_msg
.pid
);
893 DBG("Apps thread dying");
901 unlink(apps_unix_sock_path
);
906 * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
907 * exec or it will fails.
909 static int spawn_kconsumerd_thread(void)
913 /* Setup semaphore */
914 sem_init(&kconsumerd_sem
, 0, 0);
916 ret
= pthread_create(&kconsumerd_thread
, NULL
, thread_manage_kconsumerd
, (void *) NULL
);
918 perror("pthread_create kconsumerd");
922 /* Wait for the kconsumerd thread to be ready */
923 sem_wait(&kconsumerd_sem
);
925 if (kconsumerd_pid
== 0) {
926 ERR("Kconsumerd did not start");
933 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
938 * Join kernel consumer thread
940 static int join_kconsumerd_thread(void)
945 if (kconsumerd_pid
!= 0) {
946 ret
= kill(kconsumerd_pid
, SIGTERM
);
948 ERR("Error killing kconsumerd");
951 return pthread_join(kconsumerd_thread
, &status
);
958 * Fork and exec a kernel consumer daemon (kconsumerd).
960 * Return pid if successful else -1.
962 static pid_t
spawn_kconsumerd(void)
966 const char *verbosity
;
968 DBG("Spawning kconsumerd");
975 if (opt_verbose
> 1 || opt_verbose_kconsumerd
) {
976 verbosity
= "--verbose";
978 verbosity
= "--quiet";
980 execl(INSTALL_BIN_PATH
"/ltt-kconsumerd", "ltt-kconsumerd", verbosity
, NULL
);
982 perror("kernel start consumer exec");
985 } else if (pid
> 0) {
989 perror("kernel start consumer fork");
999 * Spawn the kconsumerd daemon and session daemon thread.
1001 static int start_kconsumerd(void)
1005 pthread_mutex_lock(&kconsumerd_pid_mutex
);
1006 if (kconsumerd_pid
!= 0) {
1007 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
1011 ret
= spawn_kconsumerd();
1013 ERR("Spawning kconsumerd failed");
1014 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1015 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
1019 /* Setting up the global kconsumerd_pid */
1020 kconsumerd_pid
= ret
;
1021 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
1023 DBG("Kconsumerd pid %d", ret
);
1025 DBG("Spawning kconsumerd thread");
1026 ret
= spawn_kconsumerd_thread();
1028 ERR("Fatal error spawning kconsumerd thread");
1040 * modprobe_kernel_modules
1042 static int modprobe_kernel_modules(void)
1047 for (i
= 0; i
< ARRAY_SIZE(kernel_modules_list
); i
++) {
1048 ret
= snprintf(modprobe
, sizeof(modprobe
),
1049 "/sbin/modprobe %s%s",
1050 kernel_modules_list
[i
].required
? "" : "--quiet ",
1051 kernel_modules_list
[i
].name
);
1053 perror("snprintf modprobe");
1056 modprobe
[sizeof(modprobe
) - 1] = '\0';
1057 ret
= system(modprobe
);
1059 ERR("Unable to launch modprobe for module %s",
1060 kernel_modules_list
[i
].name
);
1061 } else if (kernel_modules_list
[i
].required
1062 && WEXITSTATUS(ret
) != 0) {
1063 ERR("Unable to load module %s",
1064 kernel_modules_list
[i
].name
);
1066 DBG("Modprobe successfully %s",
1067 kernel_modules_list
[i
].name
);
1076 * modprobe_remove_kernel_modules
1077 * Remove modules in reverse load order.
1079 static int modprobe_remove_kernel_modules(void)
1084 for (i
= ARRAY_SIZE(kernel_modules_list
) - 1; i
>= 0; i
--) {
1085 ret
= snprintf(modprobe
, sizeof(modprobe
),
1086 "/sbin/modprobe --remove --quiet %s",
1087 kernel_modules_list
[i
].name
);
1089 perror("snprintf modprobe --remove");
1092 modprobe
[sizeof(modprobe
) - 1] = '\0';
1093 ret
= system(modprobe
);
1095 ERR("Unable to launch modprobe --remove for module %s",
1096 kernel_modules_list
[i
].name
);
1097 } else if (kernel_modules_list
[i
].required
1098 && WEXITSTATUS(ret
) != 0) {
1099 ERR("Unable to remove module %s",
1100 kernel_modules_list
[i
].name
);
1102 DBG("Modprobe removal successful %s",
1103 kernel_modules_list
[i
].name
);
1114 static int mount_debugfs(char *path
)
1117 char *type
= "debugfs";
1119 ret
= mkdir_recursive(path
, S_IRWXU
| S_IRWXG
, geteuid(), getegid());
1124 ret
= mount(type
, path
, type
, 0, NULL
);
1126 perror("mount debugfs");
1130 DBG("Mounted debugfs successfully at %s", path
);
1137 * Setup necessary data for kernel tracer action.
1139 static void init_kernel_tracer(void)
1142 char *proc_mounts
= "/proc/mounts";
1144 char *debugfs_path
= NULL
, *lttng_path
;
1147 /* Detect debugfs */
1148 fp
= fopen(proc_mounts
, "r");
1150 ERR("Unable to probe %s", proc_mounts
);
1154 while (fgets(line
, sizeof(line
), fp
) != NULL
) {
1155 if (strstr(line
, "debugfs") != NULL
) {
1156 /* Remove first string */
1158 /* Dup string here so we can reuse line later on */
1159 debugfs_path
= strdup(strtok(NULL
, " "));
1160 DBG("Got debugfs path : %s", debugfs_path
);
1167 /* Mount debugfs if needded */
1168 if (debugfs_path
== NULL
) {
1169 ret
= asprintf(&debugfs_path
, "/mnt/debugfs");
1171 perror("asprintf debugfs path");
1174 ret
= mount_debugfs(debugfs_path
);
1180 /* Modprobe lttng kernel modules */
1181 ret
= modprobe_kernel_modules();
1186 /* Setup lttng kernel path */
1187 ret
= asprintf(<tng_path
, "%s/lttng", debugfs_path
);
1189 perror("asprintf lttng path");
1193 /* Open debugfs lttng */
1194 kernel_tracer_fd
= open(lttng_path
, O_RDWR
);
1195 if (kernel_tracer_fd
< 0) {
1196 DBG("Failed to open %s", lttng_path
);
1202 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1212 WARN("No kernel tracer available");
1213 kernel_tracer_fd
= 0;
1218 * Start tracing by creating trace directory and sending FDs to the kernel
1221 static int start_kernel_trace(struct ltt_kernel_session
*session
)
1225 if (session
->kconsumer_fds_sent
== 0) {
1227 * Assign default kernel consumer if no consumer assigned to the kernel
1228 * session. At this point, it's NOT suppose to be 0 but this is an extra
1231 if (session
->consumer_fd
== 0) {
1232 session
->consumer_fd
= kconsumerd_cmd_sock
;
1235 ret
= send_kconsumerd_fds(session
);
1237 ERR("Send kconsumerd fds failed");
1238 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1242 session
->kconsumer_fds_sent
= 1;
1250 * Notify kernel thread to update it's pollfd.
1252 static int notify_kernel_pollfd(void)
1256 /* Inform kernel thread of the new kernel channel */
1257 ret
= write(kernel_poll_pipe
[1], "!", 1);
1259 perror("write kernel poll pipe");
1266 * Allocate a channel structure and fill it.
1268 static struct lttng_channel
*init_default_channel(enum lttng_domain_type domain_type
,
1271 struct lttng_channel
*chan
;
1273 chan
= malloc(sizeof(struct lttng_channel
));
1275 perror("init channel malloc");
1279 if (snprintf(chan
->name
, NAME_MAX
, "%s", name
) < 0) {
1280 perror("snprintf channel name");
1284 chan
->attr
.overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
1285 chan
->attr
.switch_timer_interval
= DEFAULT_CHANNEL_SWITCH_TIMER
;
1286 chan
->attr
.read_timer_interval
= DEFAULT_CHANNEL_READ_TIMER
;
1288 switch (domain_type
) {
1289 case LTTNG_DOMAIN_KERNEL
:
1290 chan
->attr
.subbuf_size
= DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE
;
1291 chan
->attr
.num_subbuf
= DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
;
1292 chan
->attr
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
1296 goto error
; /* Not implemented */
1307 * Create a kernel tracer session then create the default channel.
1309 static int create_kernel_session(struct ltt_session
*session
)
1313 DBG("Creating kernel session");
1315 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1317 ret
= LTTCOMM_KERN_SESS_FAIL
;
1321 /* Set kernel consumer socket fd */
1322 if (kconsumerd_cmd_sock
) {
1323 session
->kernel_session
->consumer_fd
= kconsumerd_cmd_sock
;
1326 ret
= asprintf(&session
->kernel_session
->trace_path
, "%s/kernel",
1329 perror("asprintf kernel traces path");
1333 ret
= mkdir_recursive(session
->kernel_session
->trace_path
,
1334 S_IRWXU
| S_IRWXG
, geteuid(), allowed_group());
1336 if (ret
!= -EEXIST
) {
1337 ERR("Trace directory creation error");
1347 * Using the session list, filled a lttng_session array to send back to the
1348 * client for session listing.
1350 * The session list lock MUST be acquired before calling this function. Use
1351 * lock_session_list() and unlock_session_list().
1353 static void list_lttng_sessions(struct lttng_session
*sessions
)
1356 struct ltt_session
*session
;
1358 DBG("Getting all available session");
1360 * Iterate over session list and append data after the control struct in
1363 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1364 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
1365 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
1366 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
1367 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
1373 * Fill lttng_channel array of all channels.
1375 static void list_lttng_channels(struct ltt_session
*session
,
1376 struct lttng_channel
*channels
)
1379 struct ltt_kernel_channel
*kchan
;
1381 DBG("Listing channels for session %s", session
->name
);
1383 /* Kernel channels */
1384 if (session
->kernel_session
!= NULL
) {
1385 cds_list_for_each_entry(kchan
, &session
->kernel_session
->channel_list
.head
, list
) {
1386 /* Copy lttng_channel struct to array */
1387 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
1388 channels
[i
].enabled
= kchan
->enabled
;
1393 /* TODO: Missing UST listing */
1397 * Fill lttng_event array of all events in the channel.
1399 static void list_lttng_events(struct ltt_kernel_channel
*kchan
,
1400 struct lttng_event
*events
)
1403 * TODO: This is ONLY kernel. Need UST support.
1406 struct ltt_kernel_event
*event
;
1408 DBG("Listing events for channel %s", kchan
->channel
->name
);
1410 /* Kernel channels */
1411 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
1412 strncpy(events
[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
1413 events
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1414 events
[i
].enabled
= event
->enabled
;
1415 switch (event
->event
->instrumentation
) {
1416 case LTTNG_KERNEL_TRACEPOINT
:
1417 events
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1419 case LTTNG_KERNEL_KPROBE
:
1420 case LTTNG_KERNEL_KRETPROBE
:
1421 events
[i
].type
= LTTNG_EVENT_PROBE
;
1422 memcpy(&events
[i
].attr
.probe
, &event
->event
->u
.kprobe
,
1423 sizeof(struct lttng_kernel_kprobe
));
1425 case LTTNG_KERNEL_FUNCTION
:
1426 events
[i
].type
= LTTNG_EVENT_FUNCTION
;
1427 memcpy(&events
[i
].attr
.ftrace
, &event
->event
->u
.ftrace
,
1428 sizeof(struct lttng_kernel_function
));
1436 * Process the command requested by the lttng client within the command
1437 * context structure. This function make sure that the return structure (llm)
1438 * is set and ready for transmission before returning.
1440 * Return any error encountered or 0 for success.
1442 static int process_client_msg(struct command_ctx
*cmd_ctx
)
1444 int ret
= LTTCOMM_OK
;
1446 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
1449 * Commands that DO NOT need a session.
1451 switch (cmd_ctx
->lsm
->cmd_type
) {
1452 case LTTNG_CREATE_SESSION
:
1453 case LTTNG_LIST_SESSIONS
:
1454 case LTTNG_LIST_TRACEPOINTS
:
1455 case LTTNG_CALIBRATE
:
1458 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
1459 cmd_ctx
->session
= find_session_by_name(cmd_ctx
->lsm
->session
.name
);
1460 if (cmd_ctx
->session
== NULL
) {
1461 /* If session name not found */
1462 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
1463 ret
= LTTCOMM_SESS_NOT_FOUND
;
1464 } else { /* If no session name specified */
1465 ret
= LTTCOMM_SELECT_SESS
;
1469 /* Acquire lock for the session */
1470 lock_session(cmd_ctx
->session
);
1476 * Check domain type for specific "pre-action".
1478 switch (cmd_ctx
->lsm
->domain
.type
) {
1479 case LTTNG_DOMAIN_KERNEL
:
1480 /* Kernel tracer check */
1481 if (kernel_tracer_fd
== 0) {
1482 init_kernel_tracer();
1483 if (kernel_tracer_fd
== 0) {
1484 ret
= LTTCOMM_KERN_NA
;
1489 /* Need a session for kernel command */
1490 switch (cmd_ctx
->lsm
->cmd_type
) {
1491 case LTTNG_CALIBRATE
:
1492 case LTTNG_CREATE_SESSION
:
1493 case LTTNG_LIST_SESSIONS
:
1494 case LTTNG_LIST_TRACEPOINTS
:
1497 if (cmd_ctx
->session
->kernel_session
== NULL
) {
1498 ret
= create_kernel_session(cmd_ctx
->session
);
1500 ret
= LTTCOMM_KERN_SESS_FAIL
;
1504 /* Start the kernel consumer daemon */
1506 if (kconsumerd_pid
== 0 &&
1507 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
1508 ret
= start_kconsumerd();
1520 /* Process by command type */
1521 switch (cmd_ctx
->lsm
->cmd_type
) {
1522 case LTTNG_ADD_CONTEXT
:
1524 struct lttng_kernel_context kctx
;
1526 /* Setup lttng message with no payload */
1527 ret
= setup_lttng_msg(cmd_ctx
, 0);
1532 switch (cmd_ctx
->lsm
->domain
.type
) {
1533 case LTTNG_DOMAIN_KERNEL
:
1534 /* Create Kernel context */
1535 kctx
.ctx
= cmd_ctx
->lsm
->u
.context
.ctx
.ctx
;
1536 kctx
.u
.perf_counter
.type
= cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.type
;
1537 kctx
.u
.perf_counter
.config
= cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.config
;
1538 strncpy(kctx
.u
.perf_counter
.name
,
1539 cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.name
,
1540 LTTNG_SYMBOL_NAME_LEN
);
1541 kctx
.u
.perf_counter
.name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1543 /* Add kernel context to kernel tracer. See context.c */
1544 ret
= add_kernel_context(cmd_ctx
->session
->kernel_session
, &kctx
,
1545 cmd_ctx
->lsm
->u
.context
.event_name
,
1546 cmd_ctx
->lsm
->u
.context
.channel_name
);
1547 if (ret
!= LTTCOMM_OK
) {
1552 /* TODO: Userspace tracing */
1553 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1560 case LTTNG_DISABLE_CHANNEL
:
1562 struct ltt_kernel_channel
*kchan
;
1564 /* Setup lttng message with no payload */
1565 ret
= setup_lttng_msg(cmd_ctx
, 0);
1570 switch (cmd_ctx
->lsm
->domain
.type
) {
1571 case LTTNG_DOMAIN_KERNEL
:
1572 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1573 cmd_ctx
->session
->kernel_session
);
1574 if (kchan
== NULL
) {
1575 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1577 } else if (kchan
->enabled
== 1) {
1578 ret
= kernel_disable_channel(kchan
);
1580 if (ret
!= EEXIST
) {
1581 ret
= LTTCOMM_KERN_CHAN_DISABLE_FAIL
;
1586 kernel_wait_quiescent(kernel_tracer_fd
);
1589 /* TODO: Userspace tracing */
1590 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1597 case LTTNG_DISABLE_EVENT
:
1599 struct ltt_kernel_channel
*kchan
;
1600 struct ltt_kernel_event
*kevent
;
1602 /* Setup lttng message with no payload */
1603 ret
= setup_lttng_msg(cmd_ctx
, 0);
1608 switch (cmd_ctx
->lsm
->domain
.type
) {
1609 case LTTNG_DOMAIN_KERNEL
:
1610 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1611 cmd_ctx
->session
->kernel_session
);
1612 if (kchan
== NULL
) {
1613 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1617 kevent
= get_kernel_event_by_name(cmd_ctx
->lsm
->u
.disable
.name
, kchan
);
1618 if (kevent
!= NULL
) {
1619 DBG("Disabling kernel event %s for channel %s.", kevent
->event
->name
,
1620 kchan
->channel
->name
);
1621 ret
= kernel_disable_event(kevent
);
1623 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
1628 kernel_wait_quiescent(kernel_tracer_fd
);
1631 /* TODO: Userspace tracing */
1632 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1639 case LTTNG_DISABLE_ALL_EVENT
:
1641 struct ltt_kernel_channel
*kchan
;
1642 struct ltt_kernel_event
*kevent
;
1644 /* Setup lttng message with no payload */
1645 ret
= setup_lttng_msg(cmd_ctx
, 0);
1650 switch (cmd_ctx
->lsm
->domain
.type
) {
1651 case LTTNG_DOMAIN_KERNEL
:
1652 DBG("Disabling all enabled kernel events");
1653 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1654 cmd_ctx
->session
->kernel_session
);
1655 if (kchan
== NULL
) {
1656 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1660 /* For each event in the kernel session */
1661 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
1662 DBG("Disabling kernel event %s for channel %s.",
1663 kevent
->event
->name
, kchan
->channel
->name
);
1664 ret
= kernel_disable_event(kevent
);
1670 /* Quiescent wait after event disable */
1671 kernel_wait_quiescent(kernel_tracer_fd
);
1674 /* TODO: Userspace tracing */
1675 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1682 case LTTNG_ENABLE_CHANNEL
:
1684 struct ltt_kernel_channel
*kchan
;
1686 /* Setup lttng message with no payload */
1687 ret
= setup_lttng_msg(cmd_ctx
, 0);
1692 switch (cmd_ctx
->lsm
->domain
.type
) {
1693 case LTTNG_DOMAIN_KERNEL
:
1694 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.enable
.channel_name
,
1695 cmd_ctx
->session
->kernel_session
);
1696 if (kchan
== NULL
) {
1697 /* Channel not found, creating it */
1698 DBG("Creating kernel channel");
1700 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1701 &cmd_ctx
->lsm
->u
.channel
.chan
,
1702 cmd_ctx
->session
->kernel_session
->trace_path
);
1704 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1708 /* Notify kernel thread that there is a new channel */
1709 ret
= notify_kernel_pollfd();
1711 ret
= LTTCOMM_FATAL
;
1714 } else if (kchan
->enabled
== 0) {
1715 ret
= kernel_enable_channel(kchan
);
1717 if (ret
!= EEXIST
) {
1718 ret
= LTTCOMM_KERN_CHAN_ENABLE_FAIL
;
1724 kernel_wait_quiescent(kernel_tracer_fd
);
1727 /* TODO: Userspace tracing */
1728 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1735 case LTTNG_ENABLE_EVENT
:
1738 struct ltt_kernel_channel
*kchan
;
1739 struct ltt_kernel_event
*kevent
;
1740 struct lttng_channel
*chan
;
1742 /* Setup lttng message with no payload */
1743 ret
= setup_lttng_msg(cmd_ctx
, 0);
1748 channel_name
= cmd_ctx
->lsm
->u
.enable
.channel_name
;
1750 switch (cmd_ctx
->lsm
->domain
.type
) {
1751 case LTTNG_DOMAIN_KERNEL
:
1752 kchan
= get_kernel_channel_by_name(channel_name
,
1753 cmd_ctx
->session
->kernel_session
);
1754 if (kchan
== NULL
) {
1755 DBG("Channel not found. Creating channel %s", channel_name
);
1757 chan
= init_default_channel(cmd_ctx
->lsm
->domain
.type
, channel_name
);
1759 ret
= LTTCOMM_FATAL
;
1763 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1764 chan
, cmd_ctx
->session
->kernel_session
->trace_path
);
1766 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1769 kchan
= get_kernel_channel_by_name(channel_name
,
1770 cmd_ctx
->session
->kernel_session
);
1771 if (kchan
== NULL
) {
1772 ERR("Channel %s not found after creation. Internal error, giving up.",
1774 ret
= LTTCOMM_FATAL
;
1779 kevent
= get_kernel_event_by_name(cmd_ctx
->lsm
->u
.enable
.event
.name
, kchan
);
1780 if (kevent
== NULL
) {
1781 DBG("Creating kernel event %s for channel %s.",
1782 cmd_ctx
->lsm
->u
.enable
.event
.name
, channel_name
);
1783 ret
= kernel_create_event(&cmd_ctx
->lsm
->u
.enable
.event
, kchan
);
1785 DBG("Enabling kernel event %s for channel %s.",
1786 kevent
->event
->name
, channel_name
);
1787 ret
= kernel_enable_event(kevent
);
1788 if (ret
== -EEXIST
) {
1789 ret
= LTTCOMM_KERN_EVENT_EXIST
;
1795 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
1799 kernel_wait_quiescent(kernel_tracer_fd
);
1802 /* TODO: Userspace tracing */
1803 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1809 case LTTNG_ENABLE_ALL_EVENT
:
1813 struct ltt_kernel_channel
*kchan
;
1814 struct ltt_kernel_event
*kevent
;
1815 struct lttng_event
*event_list
;
1816 struct lttng_channel
*chan
;
1818 /* Setup lttng message with no payload */
1819 ret
= setup_lttng_msg(cmd_ctx
, 0);
1824 DBG("Enabling all kernel event");
1826 channel_name
= cmd_ctx
->lsm
->u
.enable
.channel_name
;
1828 switch (cmd_ctx
->lsm
->domain
.type
) {
1829 case LTTNG_DOMAIN_KERNEL
:
1830 kchan
= get_kernel_channel_by_name(channel_name
,
1831 cmd_ctx
->session
->kernel_session
);
1832 if (kchan
== NULL
) {
1833 DBG("Channel not found. Creating channel %s", channel_name
);
1835 chan
= init_default_channel(cmd_ctx
->lsm
->domain
.type
, channel_name
);
1837 ret
= LTTCOMM_FATAL
;
1841 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1842 chan
, cmd_ctx
->session
->kernel_session
->trace_path
);
1844 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1847 kchan
= get_kernel_channel_by_name(channel_name
,
1848 cmd_ctx
->session
->kernel_session
);
1849 if (kchan
== NULL
) {
1850 ERR("Channel %s not found after creation. Internal error, giving up.",
1852 ret
= LTTCOMM_FATAL
;
1857 /* For each event in the kernel session */
1858 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
1859 DBG("Enabling kernel event %s for channel %s.",
1860 kevent
->event
->name
, channel_name
);
1861 ret
= kernel_enable_event(kevent
);
1867 size
= kernel_list_events(kernel_tracer_fd
, &event_list
);
1869 ret
= LTTCOMM_KERN_LIST_FAIL
;
1873 for (i
= 0; i
< size
; i
++) {
1874 kevent
= get_kernel_event_by_name(event_list
[i
].name
, kchan
);
1875 if (kevent
== NULL
) {
1876 /* Default event type for enable all */
1877 event_list
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1878 /* Enable each single tracepoint event */
1879 ret
= kernel_create_event(&event_list
[i
], kchan
);
1881 /* Ignore error here and continue */
1888 /* Quiescent wait after event enable */
1889 kernel_wait_quiescent(kernel_tracer_fd
);
1892 /* TODO: Userspace tracing */
1893 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1900 case LTTNG_LIST_TRACEPOINTS
:
1902 struct lttng_event
*events
;
1903 ssize_t nb_events
= 0;
1905 switch (cmd_ctx
->lsm
->domain
.type
) {
1906 case LTTNG_DOMAIN_KERNEL
:
1907 DBG("Listing kernel events");
1908 nb_events
= kernel_list_events(kernel_tracer_fd
, &events
);
1909 if (nb_events
< 0) {
1910 ret
= LTTCOMM_KERN_LIST_FAIL
;
1915 /* TODO: Userspace listing */
1916 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1921 * Setup lttng message with payload size set to the event list size in
1922 * bytes and then copy list into the llm payload.
1924 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
1930 /* Copy event list into message payload */
1931 memcpy(cmd_ctx
->llm
->payload
, events
,
1932 sizeof(struct lttng_event
) * nb_events
);
1939 case LTTNG_START_TRACE
:
1941 struct ltt_kernel_channel
*chan
;
1943 /* Setup lttng message with no payload */
1944 ret
= setup_lttng_msg(cmd_ctx
, 0);
1949 /* Kernel tracing */
1950 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
1951 if (cmd_ctx
->session
->kernel_session
->metadata
== NULL
) {
1952 DBG("Open kernel metadata");
1953 ret
= kernel_open_metadata(cmd_ctx
->session
->kernel_session
,
1954 cmd_ctx
->session
->kernel_session
->trace_path
);
1956 ret
= LTTCOMM_KERN_META_FAIL
;
1961 if (cmd_ctx
->session
->kernel_session
->metadata_stream_fd
== 0) {
1962 DBG("Opening kernel metadata stream");
1963 if (cmd_ctx
->session
->kernel_session
->metadata_stream_fd
== 0) {
1964 ret
= kernel_open_metadata_stream(cmd_ctx
->session
->kernel_session
);
1966 ERR("Kernel create metadata stream failed");
1967 ret
= LTTCOMM_KERN_STREAM_FAIL
;
1973 /* For each channel */
1974 cds_list_for_each_entry(chan
,
1975 &cmd_ctx
->session
->kernel_session
->channel_list
.head
, list
) {
1976 if (chan
->stream_count
== 0) {
1977 ret
= kernel_open_channel_stream(chan
);
1979 ERR("Kernel create channel stream failed");
1980 ret
= LTTCOMM_KERN_STREAM_FAIL
;
1983 /* Update the stream global counter */
1984 cmd_ctx
->session
->kernel_session
->stream_count_global
+= ret
;
1988 ret
= start_kernel_trace(cmd_ctx
->session
->kernel_session
);
1990 ret
= LTTCOMM_KERN_START_FAIL
;
1994 DBG("Start kernel tracing");
1995 ret
= kernel_start_session(cmd_ctx
->session
->kernel_session
);
1997 ERR("Kernel start session failed");
1998 ret
= LTTCOMM_KERN_START_FAIL
;
2002 /* Quiescent wait after starting trace */
2003 kernel_wait_quiescent(kernel_tracer_fd
);
2006 /* TODO: Start all UST traces */
2011 case LTTNG_STOP_TRACE
:
2013 struct ltt_kernel_channel
*chan
;
2014 /* Setup lttng message with no payload */
2015 ret
= setup_lttng_msg(cmd_ctx
, 0);
2021 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2022 DBG("Stop kernel tracing");
2024 ret
= kernel_metadata_flush_buffer(cmd_ctx
->session
->kernel_session
->metadata_stream_fd
);
2026 ERR("Kernel metadata flush failed");
2029 cds_list_for_each_entry(chan
, &cmd_ctx
->session
->kernel_session
->channel_list
.head
, list
) {
2030 ret
= kernel_flush_buffer(chan
);
2032 ERR("Kernel flush buffer error");
2036 ret
= kernel_stop_session(cmd_ctx
->session
->kernel_session
);
2038 ERR("Kernel stop session failed");
2039 ret
= LTTCOMM_KERN_STOP_FAIL
;
2043 /* Quiescent wait after stopping trace */
2044 kernel_wait_quiescent(kernel_tracer_fd
);
2047 /* TODO : User-space tracer */
2052 case LTTNG_CREATE_SESSION
:
2054 /* Setup lttng message with no payload */
2055 ret
= setup_lttng_msg(cmd_ctx
, 0);
2060 ret
= create_session(cmd_ctx
->lsm
->session
.name
, cmd_ctx
->lsm
->session
.path
);
2062 if (ret
== -EEXIST
) {
2063 ret
= LTTCOMM_EXIST_SESS
;
2065 ret
= LTTCOMM_FATAL
;
2073 case LTTNG_DESTROY_SESSION
:
2075 /* Setup lttng message with no payload */
2076 ret
= setup_lttng_msg(cmd_ctx
, 0);
2081 /* Clean kernel session teardown */
2082 teardown_kernel_session(cmd_ctx
->session
);
2084 ret
= destroy_session(cmd_ctx
->lsm
->session
.name
);
2086 ret
= LTTCOMM_FATAL
;
2091 * Must notify the kernel thread here to update it's pollfd in order to
2092 * remove the channel(s)' fd just destroyed.
2094 ret
= notify_kernel_pollfd();
2096 ret
= LTTCOMM_FATAL
;
2103 case LTTNG_LIST_DOMAINS
:
2107 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2111 nb_dom
+= cmd_ctx
->session
->ust_trace_count
;
2113 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_domain
) * nb_dom
);
2118 ((struct lttng_domain
*)(cmd_ctx
->llm
->payload
))[0].type
=
2119 LTTNG_DOMAIN_KERNEL
;
2121 /* TODO: User-space tracer domain support */
2125 case LTTNG_LIST_CHANNELS
:
2128 * TODO: Only kernel channels are listed here. UST listing
2129 * is needed on lttng-ust 2.0 release.
2132 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2133 nb_chan
+= cmd_ctx
->session
->kernel_session
->channel_count
;
2136 ret
= setup_lttng_msg(cmd_ctx
,
2137 sizeof(struct lttng_channel
) * nb_chan
);
2142 list_lttng_channels(cmd_ctx
->session
,
2143 (struct lttng_channel
*)(cmd_ctx
->llm
->payload
));
2148 case LTTNG_LIST_EVENTS
:
2151 * TODO: Only kernel events are listed here. UST listing
2152 * is needed on lttng-ust 2.0 release.
2154 size_t nb_event
= 0;
2155 struct ltt_kernel_channel
*kchan
= NULL
;
2157 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2158 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.list
.channel_name
,
2159 cmd_ctx
->session
->kernel_session
);
2160 if (kchan
== NULL
) {
2161 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2164 nb_event
+= kchan
->event_count
;
2167 ret
= setup_lttng_msg(cmd_ctx
,
2168 sizeof(struct lttng_event
) * nb_event
);
2173 DBG("Listing events (%zu events)", nb_event
);
2175 list_lttng_events(kchan
,
2176 (struct lttng_event
*)(cmd_ctx
->llm
->payload
));
2181 case LTTNG_LIST_SESSIONS
:
2183 lock_session_list();
2185 if (session_list_ptr
->count
== 0) {
2186 ret
= LTTCOMM_NO_SESSION
;
2187 unlock_session_list();
2191 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) *
2192 session_list_ptr
->count
);
2194 unlock_session_list();
2198 /* Filled the session array */
2199 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
));
2201 unlock_session_list();
2206 case LTTNG_CALIBRATE
:
2208 /* Setup lttng message with no payload */
2209 ret
= setup_lttng_msg(cmd_ctx
, 0);
2214 switch (cmd_ctx
->lsm
->domain
.type
) {
2215 case LTTNG_DOMAIN_KERNEL
:
2217 struct lttng_kernel_calibrate kcalibrate
;
2219 kcalibrate
.type
= cmd_ctx
->lsm
->u
.calibrate
.type
;
2220 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2222 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2228 /* TODO: Userspace tracing */
2229 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2235 case LTTNG_REGISTER_CONSUMER
:
2239 /* Setup lttng message with no payload */
2240 ret
= setup_lttng_msg(cmd_ctx
, 0);
2245 switch (cmd_ctx
->lsm
->domain
.type
) {
2246 case LTTNG_DOMAIN_KERNEL
:
2248 /* Can't register a consumer if there is already one */
2249 if (cmd_ctx
->session
->kernel_session
->consumer_fd
!= 0) {
2250 ret
= LTTCOMM_CONNECT_FAIL
;
2254 sock
= lttcomm_connect_unix_sock(cmd_ctx
->lsm
->u
.reg
.path
);
2256 ret
= LTTCOMM_CONNECT_FAIL
;
2260 cmd_ctx
->session
->kernel_session
->consumer_fd
= sock
;
2264 /* TODO: Userspace tracing */
2265 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2274 /* Undefined command */
2275 ret
= setup_lttng_msg(cmd_ctx
, 0);
2284 /* Set return code */
2285 cmd_ctx
->llm
->ret_code
= ret
;
2287 if (cmd_ctx
->session
) {
2288 unlock_session(cmd_ctx
->session
);
2294 if (cmd_ctx
->llm
== NULL
) {
2295 DBG("Missing llm structure. Allocating one.");
2296 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
2300 /* Notify client of error */
2301 cmd_ctx
->llm
->ret_code
= ret
;
2304 if (cmd_ctx
->session
) {
2305 unlock_session(cmd_ctx
->session
);
2311 * This thread manage all clients request using the unix client socket for
2314 static void *thread_manage_clients(void *data
)
2317 struct command_ctx
*cmd_ctx
= NULL
;
2318 struct pollfd pollfd
[2];
2320 DBG("[thread] Manage client started");
2322 ret
= lttcomm_listen_unix_sock(client_sock
);
2327 /* First fd is always the quit pipe */
2328 pollfd
[0].fd
= thread_quit_pipe
[0];
2331 pollfd
[1].fd
= client_sock
;
2332 pollfd
[1].events
= POLLIN
;
2334 /* Notify parent pid that we are ready
2335 * to accept command for client side.
2337 if (opt_sig_parent
) {
2338 kill(ppid
, SIGCHLD
);
2342 DBG("Accepting client command ...");
2344 /* Inifinite blocking call, waiting for transmission */
2345 ret
= poll(pollfd
, 2, -1);
2347 perror("poll client thread");
2351 /* Thread quit pipe has been closed. Killing thread. */
2352 if (pollfd
[0].revents
== POLLNVAL
) {
2354 } else if (pollfd
[1].revents
== POLLERR
) {
2355 ERR("Client socket poll error");
2359 sock
= lttcomm_accept_unix_sock(client_sock
);
2364 /* Allocate context command to process the client request */
2365 cmd_ctx
= malloc(sizeof(struct command_ctx
));
2367 /* Allocate data buffer for reception */
2368 cmd_ctx
->lsm
= malloc(sizeof(struct lttcomm_session_msg
));
2369 cmd_ctx
->llm
= NULL
;
2370 cmd_ctx
->session
= NULL
;
2373 * Data is received from the lttng client. The struct
2374 * lttcomm_session_msg (lsm) contains the command and data request of
2377 DBG("Receiving data from client ...");
2378 ret
= lttcomm_recv_unix_sock(sock
, cmd_ctx
->lsm
, sizeof(struct lttcomm_session_msg
));
2383 // TODO: Validate cmd_ctx including sanity check for security purpose.
2386 * This function dispatch the work to the kernel or userspace tracer
2387 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2388 * informations for the client. The command context struct contains
2389 * everything this function may needs.
2391 ret
= process_client_msg(cmd_ctx
);
2393 /* TODO: Inform client somehow of the fatal error. At this point,
2394 * ret < 0 means that a malloc failed (ENOMEM). */
2395 /* Error detected but still accept command */
2396 clean_command_ctx(&cmd_ctx
);
2400 DBG("Sending response (size: %d, retcode: %d)",
2401 cmd_ctx
->lttng_msg_size
, cmd_ctx
->llm
->ret_code
);
2402 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
2404 ERR("Failed to send data back to client");
2407 clean_command_ctx(&cmd_ctx
);
2409 /* End of transmission */
2414 DBG("Client thread dying");
2422 unlink(client_unix_sock_path
);
2424 clean_command_ctx(&cmd_ctx
);
2430 * usage function on stderr
2432 static void usage(void)
2434 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
2435 fprintf(stderr
, " -h, --help Display this usage.\n");
2436 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
2437 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
2438 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
2439 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
2440 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
2441 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
2442 fprintf(stderr
, " -V, --version Show version number.\n");
2443 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
2444 fprintf(stderr
, " -q, --quiet No output at all.\n");
2445 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
2446 fprintf(stderr
, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n");
2450 * daemon argument parsing
2452 static int parse_args(int argc
, char **argv
)
2456 static struct option long_options
[] = {
2457 { "client-sock", 1, 0, 'c' },
2458 { "apps-sock", 1, 0, 'a' },
2459 { "kconsumerd-cmd-sock", 1, 0, 0 },
2460 { "kconsumerd-err-sock", 1, 0, 0 },
2461 { "daemonize", 0, 0, 'd' },
2462 { "sig-parent", 0, 0, 'S' },
2463 { "help", 0, 0, 'h' },
2464 { "group", 1, 0, 'g' },
2465 { "version", 0, 0, 'V' },
2466 { "quiet", 0, 0, 'q' },
2467 { "verbose", 0, 0, 'v' },
2468 { "verbose-kconsumerd", 0, 0, 'Z' },
2473 int option_index
= 0;
2474 c
= getopt_long(argc
, argv
, "dhqvVS" "a:c:g:s:E:C:Z", long_options
, &option_index
);
2481 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
2483 fprintf(stderr
, " with arg %s\n", optarg
);
2487 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2490 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2496 opt_tracing_group
= strdup(optarg
);
2502 fprintf(stdout
, "%s\n", VERSION
);
2508 snprintf(kconsumerd_err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2511 snprintf(kconsumerd_cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2517 /* Verbose level can increase using multiple -v */
2521 opt_verbose_kconsumerd
+= 1;
2524 /* Unknown option or other error.
2525 * Error is printed by getopt, just return */
2534 * Creates the two needed socket by the daemon.
2535 * apps_sock - The communication socket for all UST apps.
2536 * client_sock - The communication of the cli tool (lttng).
2538 static int init_daemon_socket(void)
2543 old_umask
= umask(0);
2545 /* Create client tool unix socket */
2546 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
2547 if (client_sock
< 0) {
2548 ERR("Create unix sock failed: %s", client_unix_sock_path
);
2553 /* File permission MUST be 660 */
2554 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
2556 ERR("Set file permissions failed: %s", client_unix_sock_path
);
2561 /* Create the application unix socket */
2562 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
2563 if (apps_sock
< 0) {
2564 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
2569 /* File permission MUST be 666 */
2570 ret
= chmod(apps_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
2572 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
2583 * Check if the global socket is available, and if a daemon is answering
2584 * at the other side. If yes, error is returned.
2586 static int check_existing_daemon(void)
2588 if (access(client_unix_sock_path
, F_OK
) < 0 &&
2589 access(apps_unix_sock_path
, F_OK
) < 0)
2591 /* Is there anybody out there ? */
2592 if (lttng_session_daemon_alive())
2599 * Set the tracing group gid onto the client socket.
2601 * Race window between mkdir and chown is OK because we are going from more
2602 * permissive (root.root) to les permissive (root.tracing).
2604 static int set_permissions(void)
2609 gid
= allowed_group();
2612 WARN("No tracing group detected");
2615 ERR("Missing tracing group. Aborting execution.");
2621 /* Set lttng run dir */
2622 ret
= chown(LTTNG_RUNDIR
, 0, gid
);
2624 ERR("Unable to set group on " LTTNG_RUNDIR
);
2628 /* lttng client socket path */
2629 ret
= chown(client_unix_sock_path
, 0, gid
);
2631 ERR("Unable to set group on %s", client_unix_sock_path
);
2635 /* kconsumerd error socket path */
2636 ret
= chown(kconsumerd_err_unix_sock_path
, 0, gid
);
2638 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path
);
2642 DBG("All permissions are set");
2649 * Create the pipe used to wake up the kernel thread.
2651 static int create_kernel_poll_pipe(void)
2653 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
2657 * Create the lttng run directory needed for all global sockets and pipe.
2659 static int create_lttng_rundir(void)
2663 ret
= mkdir(LTTNG_RUNDIR
, S_IRWXU
| S_IRWXG
);
2665 if (errno
!= EEXIST
) {
2666 ERR("Unable to create " LTTNG_RUNDIR
);
2678 * Setup sockets and directory needed by the kconsumerd communication with the
2681 static int set_kconsumerd_sockets(void)
2685 if (strlen(kconsumerd_err_unix_sock_path
) == 0) {
2686 snprintf(kconsumerd_err_unix_sock_path
, PATH_MAX
, KCONSUMERD_ERR_SOCK_PATH
);
2689 if (strlen(kconsumerd_cmd_unix_sock_path
) == 0) {
2690 snprintf(kconsumerd_cmd_unix_sock_path
, PATH_MAX
, KCONSUMERD_CMD_SOCK_PATH
);
2693 ret
= mkdir(KCONSUMERD_PATH
, S_IRWXU
| S_IRWXG
);
2695 if (errno
!= EEXIST
) {
2696 ERR("Failed to create " KCONSUMERD_PATH
);
2702 /* Create the kconsumerd error unix socket */
2703 kconsumerd_err_sock
= lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path
);
2704 if (kconsumerd_err_sock
< 0) {
2705 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path
);
2710 /* File permission MUST be 660 */
2711 ret
= chmod(kconsumerd_err_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
2713 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path
);
2723 * Signal handler for the daemon
2725 * Simply stop all worker threads, leaving main() return gracefully
2726 * after joining all threads and calling cleanup().
2728 static void sighandler(int sig
)
2732 DBG("SIGPIPE catched");
2735 DBG("SIGINT catched");
2739 DBG("SIGTERM catched");
2748 * Setup signal handler for :
2749 * SIGINT, SIGTERM, SIGPIPE
2751 static int set_signal_handler(void)
2754 struct sigaction sa
;
2757 if ((ret
= sigemptyset(&sigset
)) < 0) {
2758 perror("sigemptyset");
2762 sa
.sa_handler
= sighandler
;
2763 sa
.sa_mask
= sigset
;
2765 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
2766 perror("sigaction");
2770 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
2771 perror("sigaction");
2775 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
2776 perror("sigaction");
2780 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
2786 * Set open files limit to unlimited. This daemon can open a large number of
2787 * file descriptors in order to consumer multiple kernel traces.
2789 static void set_ulimit(void)
2794 /* The kernel does not allowed an infinite limit for open files */
2795 lim
.rlim_cur
= 65535;
2796 lim
.rlim_max
= 65535;
2798 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
2800 perror("failed to set open files limit");
2807 int main(int argc
, char **argv
)
2811 const char *home_path
;
2813 /* Create thread quit pipe */
2814 if ((ret
= init_thread_quit_pipe()) < 0) {
2818 /* Parse arguments */
2820 if ((ret
= parse_args(argc
, argv
) < 0)) {
2833 /* Check if daemon is UID = 0 */
2834 is_root
= !getuid();
2837 ret
= create_lttng_rundir();
2842 if (strlen(apps_unix_sock_path
) == 0) {
2843 snprintf(apps_unix_sock_path
, PATH_MAX
,
2844 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
2847 if (strlen(client_unix_sock_path
) == 0) {
2848 snprintf(client_unix_sock_path
, PATH_MAX
,
2849 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
2852 home_path
= get_home_dir();
2853 if (home_path
== NULL
) {
2854 /* TODO: Add --socket PATH option */
2855 ERR("Can't get HOME directory for sockets creation.");
2860 if (strlen(apps_unix_sock_path
) == 0) {
2861 snprintf(apps_unix_sock_path
, PATH_MAX
,
2862 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
2865 /* Set the cli tool unix socket path */
2866 if (strlen(client_unix_sock_path
) == 0) {
2867 snprintf(client_unix_sock_path
, PATH_MAX
,
2868 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
2872 DBG("Client socket path %s", client_unix_sock_path
);
2873 DBG("Application socket path %s", apps_unix_sock_path
);
2876 * See if daemon already exist.
2878 if ((ret
= check_existing_daemon()) < 0) {
2879 ERR("Already running daemon.\n");
2881 * We do not goto exit because we must not cleanup()
2882 * because a daemon is already running.
2887 /* After this point, we can safely call cleanup() so goto error is used */
2890 * These actions must be executed as root. We do that *after* setting up
2891 * the sockets path because we MUST make the check for another daemon using
2892 * those paths *before* trying to set the kernel consumer sockets and init
2896 ret
= set_kconsumerd_sockets();
2901 /* Setup kernel tracer */
2902 init_kernel_tracer();
2904 /* Set ulimit for open files */
2908 if ((ret
= set_signal_handler()) < 0) {
2912 /* Setup the needed unix socket */
2913 if ((ret
= init_daemon_socket()) < 0) {
2917 /* Set credentials to socket */
2918 if (is_root
&& ((ret
= set_permissions()) < 0)) {
2922 /* Get parent pid if -S, --sig-parent is specified. */
2923 if (opt_sig_parent
) {
2927 /* Setup the kernel pipe for waking up the kernel thread */
2928 if ((ret
= create_kernel_poll_pipe()) < 0) {
2933 * Get session list pointer. This pointer MUST NOT be free().
2934 * This list is statically declared in session.c
2936 session_list_ptr
= get_session_list();
2938 /* Create thread to manage the client socket */
2939 ret
= pthread_create(&client_thread
, NULL
, thread_manage_clients
, (void *) NULL
);
2941 perror("pthread_create");
2945 /* Create thread to manage application socket */
2946 ret
= pthread_create(&apps_thread
, NULL
, thread_manage_apps
, (void *) NULL
);
2948 perror("pthread_create");
2952 /* Create kernel thread to manage kernel event */
2953 ret
= pthread_create(&kernel_thread
, NULL
, thread_manage_kernel
, (void *) NULL
);
2955 perror("pthread_create");
2959 ret
= pthread_join(kernel_thread
, &status
);
2961 perror("pthread_join");
2962 goto error
; /* join error, exit without cleanup */
2966 ret
= pthread_join(apps_thread
, &status
);
2968 perror("pthread_join");
2969 goto error
; /* join error, exit without cleanup */
2973 ret
= pthread_join(client_thread
, &status
);
2975 perror("pthread_join");
2976 goto error
; /* join error, exit without cleanup */
2979 ret
= join_kconsumerd_thread();
2981 perror("join_kconsumerd");
2982 goto error
; /* join error, exit without cleanup */
2988 * cleanup() is called when no other thread is running.