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 * Basic recv here to handle the very simple data
863 * that the libust send to register (reg_msg).
865 ret
= recv(sock
, ®_msg
, sizeof(reg_msg
), 0);
871 /* Add application to the global traceable list */
872 if (reg_msg
.reg
== 1) {
874 ret
= register_traceable_app(reg_msg
.pid
, reg_msg
.uid
);
876 /* register_traceable_app only return an error with
877 * ENOMEM. At this point, we better stop everything.
883 unregister_traceable_app(reg_msg
.pid
);
888 DBG("Apps thread dying");
896 unlink(apps_unix_sock_path
);
901 * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
902 * exec or it will fails.
904 static int spawn_kconsumerd_thread(void)
908 /* Setup semaphore */
909 sem_init(&kconsumerd_sem
, 0, 0);
911 ret
= pthread_create(&kconsumerd_thread
, NULL
, thread_manage_kconsumerd
, (void *) NULL
);
913 perror("pthread_create kconsumerd");
917 /* Wait for the kconsumerd thread to be ready */
918 sem_wait(&kconsumerd_sem
);
920 if (kconsumerd_pid
== 0) {
921 ERR("Kconsumerd did not start");
928 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
933 * Join kernel consumer thread
935 static int join_kconsumerd_thread(void)
940 if (kconsumerd_pid
!= 0) {
941 ret
= kill(kconsumerd_pid
, SIGTERM
);
943 ERR("Error killing kconsumerd");
946 return pthread_join(kconsumerd_thread
, &status
);
953 * Fork and exec a kernel consumer daemon (kconsumerd).
955 * Return pid if successful else -1.
957 static pid_t
spawn_kconsumerd(void)
961 const char *verbosity
;
963 DBG("Spawning kconsumerd");
970 if (opt_verbose
> 1 || opt_verbose_kconsumerd
) {
971 verbosity
= "--verbose";
973 verbosity
= "--quiet";
975 execl(INSTALL_BIN_PATH
"/ltt-kconsumerd", "ltt-kconsumerd", verbosity
, NULL
);
977 perror("kernel start consumer exec");
980 } else if (pid
> 0) {
984 perror("kernel start consumer fork");
994 * Spawn the kconsumerd daemon and session daemon thread.
996 static int start_kconsumerd(void)
1000 pthread_mutex_lock(&kconsumerd_pid_mutex
);
1001 if (kconsumerd_pid
!= 0) {
1002 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
1006 ret
= spawn_kconsumerd();
1008 ERR("Spawning kconsumerd failed");
1009 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1010 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
1014 /* Setting up the global kconsumerd_pid */
1015 kconsumerd_pid
= ret
;
1016 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
1018 DBG("Kconsumerd pid %d", ret
);
1020 DBG("Spawning kconsumerd thread");
1021 ret
= spawn_kconsumerd_thread();
1023 ERR("Fatal error spawning kconsumerd thread");
1035 * modprobe_kernel_modules
1037 static int modprobe_kernel_modules(void)
1042 for (i
= 0; i
< ARRAY_SIZE(kernel_modules_list
); i
++) {
1043 ret
= snprintf(modprobe
, sizeof(modprobe
),
1044 "/sbin/modprobe %s%s",
1045 kernel_modules_list
[i
].required
? "" : "--quiet ",
1046 kernel_modules_list
[i
].name
);
1048 perror("snprintf modprobe");
1051 modprobe
[sizeof(modprobe
) - 1] = '\0';
1052 ret
= system(modprobe
);
1054 ERR("Unable to launch modprobe for module %s",
1055 kernel_modules_list
[i
].name
);
1056 } else if (kernel_modules_list
[i
].required
1057 && WEXITSTATUS(ret
) != 0) {
1058 ERR("Unable to load module %s",
1059 kernel_modules_list
[i
].name
);
1061 DBG("Modprobe successfully %s",
1062 kernel_modules_list
[i
].name
);
1071 * modprobe_remove_kernel_modules
1072 * Remove modules in reverse load order.
1074 static int modprobe_remove_kernel_modules(void)
1079 for (i
= ARRAY_SIZE(kernel_modules_list
) - 1; i
>= 0; i
--) {
1080 ret
= snprintf(modprobe
, sizeof(modprobe
),
1081 "/sbin/modprobe --remove --quiet %s",
1082 kernel_modules_list
[i
].name
);
1084 perror("snprintf modprobe --remove");
1087 modprobe
[sizeof(modprobe
) - 1] = '\0';
1088 ret
= system(modprobe
);
1090 ERR("Unable to launch modprobe --remove for module %s",
1091 kernel_modules_list
[i
].name
);
1092 } else if (kernel_modules_list
[i
].required
1093 && WEXITSTATUS(ret
) != 0) {
1094 ERR("Unable to remove module %s",
1095 kernel_modules_list
[i
].name
);
1097 DBG("Modprobe removal successful %s",
1098 kernel_modules_list
[i
].name
);
1109 static int mount_debugfs(char *path
)
1112 char *type
= "debugfs";
1114 ret
= mkdir_recursive(path
, S_IRWXU
| S_IRWXG
, geteuid(), getegid());
1119 ret
= mount(type
, path
, type
, 0, NULL
);
1121 perror("mount debugfs");
1125 DBG("Mounted debugfs successfully at %s", path
);
1132 * Setup necessary data for kernel tracer action.
1134 static void init_kernel_tracer(void)
1137 char *proc_mounts
= "/proc/mounts";
1139 char *debugfs_path
= NULL
, *lttng_path
;
1142 /* Detect debugfs */
1143 fp
= fopen(proc_mounts
, "r");
1145 ERR("Unable to probe %s", proc_mounts
);
1149 while (fgets(line
, sizeof(line
), fp
) != NULL
) {
1150 if (strstr(line
, "debugfs") != NULL
) {
1151 /* Remove first string */
1153 /* Dup string here so we can reuse line later on */
1154 debugfs_path
= strdup(strtok(NULL
, " "));
1155 DBG("Got debugfs path : %s", debugfs_path
);
1162 /* Mount debugfs if needded */
1163 if (debugfs_path
== NULL
) {
1164 ret
= asprintf(&debugfs_path
, "/mnt/debugfs");
1166 perror("asprintf debugfs path");
1169 ret
= mount_debugfs(debugfs_path
);
1175 /* Modprobe lttng kernel modules */
1176 ret
= modprobe_kernel_modules();
1181 /* Setup lttng kernel path */
1182 ret
= asprintf(<tng_path
, "%s/lttng", debugfs_path
);
1184 perror("asprintf lttng path");
1188 /* Open debugfs lttng */
1189 kernel_tracer_fd
= open(lttng_path
, O_RDWR
);
1190 if (kernel_tracer_fd
< 0) {
1191 DBG("Failed to open %s", lttng_path
);
1197 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1207 WARN("No kernel tracer available");
1208 kernel_tracer_fd
= 0;
1213 * Start tracing by creating trace directory and sending FDs to the kernel
1216 static int start_kernel_trace(struct ltt_kernel_session
*session
)
1220 if (session
->kconsumer_fds_sent
== 0) {
1222 * Assign default kernel consumer if no consumer assigned to the kernel
1223 * session. At this point, it's NOT suppose to be 0 but this is an extra
1226 if (session
->consumer_fd
== 0) {
1227 session
->consumer_fd
= kconsumerd_cmd_sock
;
1230 ret
= send_kconsumerd_fds(session
);
1232 ERR("Send kconsumerd fds failed");
1233 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1237 session
->kconsumer_fds_sent
= 1;
1245 * Notify kernel thread to update it's pollfd.
1247 static int notify_kernel_pollfd(void)
1251 /* Inform kernel thread of the new kernel channel */
1252 ret
= write(kernel_poll_pipe
[1], "!", 1);
1254 perror("write kernel poll pipe");
1261 * Allocate a channel structure and fill it.
1263 static struct lttng_channel
*init_default_channel(enum lttng_domain_type domain_type
,
1266 struct lttng_channel
*chan
;
1268 chan
= malloc(sizeof(struct lttng_channel
));
1270 perror("init channel malloc");
1274 if (snprintf(chan
->name
, NAME_MAX
, "%s", name
) < 0) {
1275 perror("snprintf channel name");
1279 chan
->attr
.overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
1280 chan
->attr
.switch_timer_interval
= DEFAULT_CHANNEL_SWITCH_TIMER
;
1281 chan
->attr
.read_timer_interval
= DEFAULT_CHANNEL_READ_TIMER
;
1283 switch (domain_type
) {
1284 case LTTNG_DOMAIN_KERNEL
:
1285 chan
->attr
.subbuf_size
= DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE
;
1286 chan
->attr
.num_subbuf
= DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
;
1287 chan
->attr
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
1291 goto error
; /* Not implemented */
1302 * Create a kernel tracer session then create the default channel.
1304 static int create_kernel_session(struct ltt_session
*session
)
1308 DBG("Creating kernel session");
1310 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1312 ret
= LTTCOMM_KERN_SESS_FAIL
;
1316 /* Set kernel consumer socket fd */
1317 if (kconsumerd_cmd_sock
) {
1318 session
->kernel_session
->consumer_fd
= kconsumerd_cmd_sock
;
1321 ret
= asprintf(&session
->kernel_session
->trace_path
, "%s/kernel",
1324 perror("asprintf kernel traces path");
1328 ret
= mkdir_recursive(session
->kernel_session
->trace_path
,
1329 S_IRWXU
| S_IRWXG
, geteuid(), allowed_group());
1331 if (ret
!= -EEXIST
) {
1332 ERR("Trace directory creation error");
1342 * Using the session list, filled a lttng_session array to send back to the
1343 * client for session listing.
1345 * The session list lock MUST be acquired before calling this function. Use
1346 * lock_session_list() and unlock_session_list().
1348 static void list_lttng_sessions(struct lttng_session
*sessions
)
1351 struct ltt_session
*session
;
1353 DBG("Getting all available session");
1355 * Iterate over session list and append data after the control struct in
1358 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1359 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
1360 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
1361 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
1362 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
1368 * Fill lttng_channel array of all channels.
1370 static void list_lttng_channels(struct ltt_session
*session
,
1371 struct lttng_channel
*channels
)
1374 struct ltt_kernel_channel
*kchan
;
1376 DBG("Listing channels for session %s", session
->name
);
1378 /* Kernel channels */
1379 if (session
->kernel_session
!= NULL
) {
1380 cds_list_for_each_entry(kchan
, &session
->kernel_session
->channel_list
.head
, list
) {
1381 /* Copy lttng_channel struct to array */
1382 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
1383 channels
[i
].enabled
= kchan
->enabled
;
1388 /* TODO: Missing UST listing */
1392 * Fill lttng_event array of all events in the channel.
1394 static void list_lttng_events(struct ltt_kernel_channel
*kchan
,
1395 struct lttng_event
*events
)
1398 * TODO: This is ONLY kernel. Need UST support.
1401 struct ltt_kernel_event
*event
;
1403 DBG("Listing events for channel %s", kchan
->channel
->name
);
1405 /* Kernel channels */
1406 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
1407 strncpy(events
[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
1408 events
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1409 events
[i
].enabled
= event
->enabled
;
1410 switch (event
->event
->instrumentation
) {
1411 case LTTNG_KERNEL_TRACEPOINT
:
1412 events
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1414 case LTTNG_KERNEL_KPROBE
:
1415 case LTTNG_KERNEL_KRETPROBE
:
1416 events
[i
].type
= LTTNG_EVENT_PROBE
;
1417 memcpy(&events
[i
].attr
.probe
, &event
->event
->u
.kprobe
,
1418 sizeof(struct lttng_kernel_kprobe
));
1420 case LTTNG_KERNEL_FUNCTION
:
1421 events
[i
].type
= LTTNG_EVENT_FUNCTION
;
1422 memcpy(&events
[i
].attr
.ftrace
, &event
->event
->u
.ftrace
,
1423 sizeof(struct lttng_kernel_function
));
1431 * Process the command requested by the lttng client within the command
1432 * context structure. This function make sure that the return structure (llm)
1433 * is set and ready for transmission before returning.
1435 * Return any error encountered or 0 for success.
1437 static int process_client_msg(struct command_ctx
*cmd_ctx
)
1439 int ret
= LTTCOMM_OK
;
1441 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
1444 * Commands that DO NOT need a session.
1446 switch (cmd_ctx
->lsm
->cmd_type
) {
1447 case LTTNG_CREATE_SESSION
:
1448 case LTTNG_LIST_SESSIONS
:
1449 case LTTNG_LIST_TRACEPOINTS
:
1450 case LTTNG_CALIBRATE
:
1453 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
1454 cmd_ctx
->session
= find_session_by_name(cmd_ctx
->lsm
->session
.name
);
1455 if (cmd_ctx
->session
== NULL
) {
1456 /* If session name not found */
1457 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
1458 ret
= LTTCOMM_SESS_NOT_FOUND
;
1459 } else { /* If no session name specified */
1460 ret
= LTTCOMM_SELECT_SESS
;
1464 /* Acquire lock for the session */
1465 lock_session(cmd_ctx
->session
);
1471 * Check domain type for specific "pre-action".
1473 switch (cmd_ctx
->lsm
->domain
.type
) {
1474 case LTTNG_DOMAIN_KERNEL
:
1475 /* Kernel tracer check */
1476 if (kernel_tracer_fd
== 0) {
1477 init_kernel_tracer();
1478 if (kernel_tracer_fd
== 0) {
1479 ret
= LTTCOMM_KERN_NA
;
1484 /* Need a session for kernel command */
1485 switch (cmd_ctx
->lsm
->cmd_type
) {
1486 case LTTNG_CALIBRATE
:
1487 case LTTNG_CREATE_SESSION
:
1488 case LTTNG_LIST_SESSIONS
:
1489 case LTTNG_LIST_TRACEPOINTS
:
1492 if (cmd_ctx
->session
->kernel_session
== NULL
) {
1493 ret
= create_kernel_session(cmd_ctx
->session
);
1495 ret
= LTTCOMM_KERN_SESS_FAIL
;
1499 /* Start the kernel consumer daemon */
1501 if (kconsumerd_pid
== 0 &&
1502 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
1503 ret
= start_kconsumerd();
1515 /* Process by command type */
1516 switch (cmd_ctx
->lsm
->cmd_type
) {
1517 case LTTNG_ADD_CONTEXT
:
1519 struct lttng_kernel_context kctx
;
1521 /* Setup lttng message with no payload */
1522 ret
= setup_lttng_msg(cmd_ctx
, 0);
1527 switch (cmd_ctx
->lsm
->domain
.type
) {
1528 case LTTNG_DOMAIN_KERNEL
:
1529 /* Create Kernel context */
1530 kctx
.ctx
= cmd_ctx
->lsm
->u
.context
.ctx
.ctx
;
1531 kctx
.u
.perf_counter
.type
= cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.type
;
1532 kctx
.u
.perf_counter
.config
= cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.config
;
1533 strncpy(kctx
.u
.perf_counter
.name
,
1534 cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.name
,
1535 LTTNG_SYMBOL_NAME_LEN
);
1536 kctx
.u
.perf_counter
.name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1538 /* Add kernel context to kernel tracer. See context.c */
1539 ret
= add_kernel_context(cmd_ctx
->session
->kernel_session
, &kctx
,
1540 cmd_ctx
->lsm
->u
.context
.event_name
,
1541 cmd_ctx
->lsm
->u
.context
.channel_name
);
1542 if (ret
!= LTTCOMM_OK
) {
1547 /* TODO: Userspace tracing */
1548 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1555 case LTTNG_DISABLE_CHANNEL
:
1557 struct ltt_kernel_channel
*kchan
;
1559 /* Setup lttng message with no payload */
1560 ret
= setup_lttng_msg(cmd_ctx
, 0);
1565 switch (cmd_ctx
->lsm
->domain
.type
) {
1566 case LTTNG_DOMAIN_KERNEL
:
1567 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1568 cmd_ctx
->session
->kernel_session
);
1569 if (kchan
== NULL
) {
1570 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1572 } else if (kchan
->enabled
== 1) {
1573 ret
= kernel_disable_channel(kchan
);
1575 if (ret
!= EEXIST
) {
1576 ret
= LTTCOMM_KERN_CHAN_DISABLE_FAIL
;
1581 kernel_wait_quiescent(kernel_tracer_fd
);
1584 /* TODO: Userspace tracing */
1585 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1592 case LTTNG_DISABLE_EVENT
:
1594 struct ltt_kernel_channel
*kchan
;
1595 struct ltt_kernel_event
*kevent
;
1597 /* Setup lttng message with no payload */
1598 ret
= setup_lttng_msg(cmd_ctx
, 0);
1603 switch (cmd_ctx
->lsm
->domain
.type
) {
1604 case LTTNG_DOMAIN_KERNEL
:
1605 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1606 cmd_ctx
->session
->kernel_session
);
1607 if (kchan
== NULL
) {
1608 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1612 kevent
= get_kernel_event_by_name(cmd_ctx
->lsm
->u
.disable
.name
, kchan
);
1613 if (kevent
!= NULL
) {
1614 DBG("Disabling kernel event %s for channel %s.", kevent
->event
->name
,
1615 kchan
->channel
->name
);
1616 ret
= kernel_disable_event(kevent
);
1618 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
1623 kernel_wait_quiescent(kernel_tracer_fd
);
1626 /* TODO: Userspace tracing */
1627 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1634 case LTTNG_DISABLE_ALL_EVENT
:
1636 struct ltt_kernel_channel
*kchan
;
1637 struct ltt_kernel_event
*kevent
;
1639 /* Setup lttng message with no payload */
1640 ret
= setup_lttng_msg(cmd_ctx
, 0);
1645 switch (cmd_ctx
->lsm
->domain
.type
) {
1646 case LTTNG_DOMAIN_KERNEL
:
1647 DBG("Disabling all enabled kernel events");
1648 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1649 cmd_ctx
->session
->kernel_session
);
1650 if (kchan
== NULL
) {
1651 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1655 /* For each event in the kernel session */
1656 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
1657 DBG("Disabling kernel event %s for channel %s.",
1658 kevent
->event
->name
, kchan
->channel
->name
);
1659 ret
= kernel_disable_event(kevent
);
1665 /* Quiescent wait after event disable */
1666 kernel_wait_quiescent(kernel_tracer_fd
);
1669 /* TODO: Userspace tracing */
1670 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1677 case LTTNG_ENABLE_CHANNEL
:
1679 struct ltt_kernel_channel
*kchan
;
1681 /* Setup lttng message with no payload */
1682 ret
= setup_lttng_msg(cmd_ctx
, 0);
1687 switch (cmd_ctx
->lsm
->domain
.type
) {
1688 case LTTNG_DOMAIN_KERNEL
:
1689 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.enable
.channel_name
,
1690 cmd_ctx
->session
->kernel_session
);
1691 if (kchan
== NULL
) {
1692 /* Channel not found, creating it */
1693 DBG("Creating kernel channel");
1695 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1696 &cmd_ctx
->lsm
->u
.channel
.chan
,
1697 cmd_ctx
->session
->kernel_session
->trace_path
);
1699 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1703 /* Notify kernel thread that there is a new channel */
1704 ret
= notify_kernel_pollfd();
1706 ret
= LTTCOMM_FATAL
;
1709 } else if (kchan
->enabled
== 0) {
1710 ret
= kernel_enable_channel(kchan
);
1712 if (ret
!= EEXIST
) {
1713 ret
= LTTCOMM_KERN_CHAN_ENABLE_FAIL
;
1719 kernel_wait_quiescent(kernel_tracer_fd
);
1722 /* TODO: Userspace tracing */
1723 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1730 case LTTNG_ENABLE_EVENT
:
1733 struct ltt_kernel_channel
*kchan
;
1734 struct ltt_kernel_event
*kevent
;
1735 struct lttng_channel
*chan
;
1737 /* Setup lttng message with no payload */
1738 ret
= setup_lttng_msg(cmd_ctx
, 0);
1743 channel_name
= cmd_ctx
->lsm
->u
.enable
.channel_name
;
1745 switch (cmd_ctx
->lsm
->domain
.type
) {
1746 case LTTNG_DOMAIN_KERNEL
:
1747 kchan
= get_kernel_channel_by_name(channel_name
,
1748 cmd_ctx
->session
->kernel_session
);
1749 if (kchan
== NULL
) {
1750 DBG("Channel not found. Creating channel %s", channel_name
);
1752 chan
= init_default_channel(cmd_ctx
->lsm
->domain
.type
, channel_name
);
1754 ret
= LTTCOMM_FATAL
;
1758 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1759 chan
, cmd_ctx
->session
->kernel_session
->trace_path
);
1761 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1764 kchan
= get_kernel_channel_by_name(channel_name
,
1765 cmd_ctx
->session
->kernel_session
);
1766 if (kchan
== NULL
) {
1767 ERR("Channel %s not found after creation. Internal error, giving up.",
1769 ret
= LTTCOMM_FATAL
;
1774 kevent
= get_kernel_event_by_name(cmd_ctx
->lsm
->u
.enable
.event
.name
, kchan
);
1775 if (kevent
== NULL
) {
1776 DBG("Creating kernel event %s for channel %s.",
1777 cmd_ctx
->lsm
->u
.enable
.event
.name
, channel_name
);
1778 ret
= kernel_create_event(&cmd_ctx
->lsm
->u
.enable
.event
, kchan
);
1780 DBG("Enabling kernel event %s for channel %s.",
1781 kevent
->event
->name
, channel_name
);
1782 ret
= kernel_enable_event(kevent
);
1783 if (ret
== -EEXIST
) {
1784 ret
= LTTCOMM_KERN_EVENT_EXIST
;
1790 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
1794 kernel_wait_quiescent(kernel_tracer_fd
);
1797 /* TODO: Userspace tracing */
1798 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1804 case LTTNG_ENABLE_ALL_EVENT
:
1808 struct ltt_kernel_channel
*kchan
;
1809 struct ltt_kernel_event
*kevent
;
1810 struct lttng_event
*event_list
;
1811 struct lttng_channel
*chan
;
1813 /* Setup lttng message with no payload */
1814 ret
= setup_lttng_msg(cmd_ctx
, 0);
1819 DBG("Enabling all kernel event");
1821 channel_name
= cmd_ctx
->lsm
->u
.enable
.channel_name
;
1823 switch (cmd_ctx
->lsm
->domain
.type
) {
1824 case LTTNG_DOMAIN_KERNEL
:
1825 kchan
= get_kernel_channel_by_name(channel_name
,
1826 cmd_ctx
->session
->kernel_session
);
1827 if (kchan
== NULL
) {
1828 DBG("Channel not found. Creating channel %s", channel_name
);
1830 chan
= init_default_channel(cmd_ctx
->lsm
->domain
.type
, channel_name
);
1832 ret
= LTTCOMM_FATAL
;
1836 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1837 chan
, cmd_ctx
->session
->kernel_session
->trace_path
);
1839 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1842 kchan
= get_kernel_channel_by_name(channel_name
,
1843 cmd_ctx
->session
->kernel_session
);
1844 if (kchan
== NULL
) {
1845 ERR("Channel %s not found after creation. Internal error, giving up.",
1847 ret
= LTTCOMM_FATAL
;
1852 /* For each event in the kernel session */
1853 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
1854 DBG("Enabling kernel event %s for channel %s.",
1855 kevent
->event
->name
, channel_name
);
1856 ret
= kernel_enable_event(kevent
);
1862 size
= kernel_list_events(kernel_tracer_fd
, &event_list
);
1864 ret
= LTTCOMM_KERN_LIST_FAIL
;
1868 for (i
= 0; i
< size
; i
++) {
1869 kevent
= get_kernel_event_by_name(event_list
[i
].name
, kchan
);
1870 if (kevent
== NULL
) {
1871 /* Default event type for enable all */
1872 event_list
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1873 /* Enable each single tracepoint event */
1874 ret
= kernel_create_event(&event_list
[i
], kchan
);
1876 /* Ignore error here and continue */
1883 /* Quiescent wait after event enable */
1884 kernel_wait_quiescent(kernel_tracer_fd
);
1887 /* TODO: Userspace tracing */
1888 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1895 case LTTNG_LIST_TRACEPOINTS
:
1897 struct lttng_event
*events
;
1898 ssize_t nb_events
= 0;
1900 switch (cmd_ctx
->lsm
->domain
.type
) {
1901 case LTTNG_DOMAIN_KERNEL
:
1902 DBG("Listing kernel events");
1903 nb_events
= kernel_list_events(kernel_tracer_fd
, &events
);
1904 if (nb_events
< 0) {
1905 ret
= LTTCOMM_KERN_LIST_FAIL
;
1910 /* TODO: Userspace listing */
1911 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1916 * Setup lttng message with payload size set to the event list size in
1917 * bytes and then copy list into the llm payload.
1919 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
1925 /* Copy event list into message payload */
1926 memcpy(cmd_ctx
->llm
->payload
, events
,
1927 sizeof(struct lttng_event
) * nb_events
);
1934 case LTTNG_START_TRACE
:
1936 struct ltt_kernel_channel
*chan
;
1938 /* Setup lttng message with no payload */
1939 ret
= setup_lttng_msg(cmd_ctx
, 0);
1944 /* Kernel tracing */
1945 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
1946 if (cmd_ctx
->session
->kernel_session
->metadata
== NULL
) {
1947 DBG("Open kernel metadata");
1948 ret
= kernel_open_metadata(cmd_ctx
->session
->kernel_session
,
1949 cmd_ctx
->session
->kernel_session
->trace_path
);
1951 ret
= LTTCOMM_KERN_META_FAIL
;
1956 if (cmd_ctx
->session
->kernel_session
->metadata_stream_fd
== 0) {
1957 DBG("Opening kernel metadata stream");
1958 if (cmd_ctx
->session
->kernel_session
->metadata_stream_fd
== 0) {
1959 ret
= kernel_open_metadata_stream(cmd_ctx
->session
->kernel_session
);
1961 ERR("Kernel create metadata stream failed");
1962 ret
= LTTCOMM_KERN_STREAM_FAIL
;
1968 /* For each channel */
1969 cds_list_for_each_entry(chan
,
1970 &cmd_ctx
->session
->kernel_session
->channel_list
.head
, list
) {
1971 if (chan
->stream_count
== 0) {
1972 ret
= kernel_open_channel_stream(chan
);
1974 ERR("Kernel create channel stream failed");
1975 ret
= LTTCOMM_KERN_STREAM_FAIL
;
1978 /* Update the stream global counter */
1979 cmd_ctx
->session
->kernel_session
->stream_count_global
+= ret
;
1983 ret
= start_kernel_trace(cmd_ctx
->session
->kernel_session
);
1985 ret
= LTTCOMM_KERN_START_FAIL
;
1989 DBG("Start kernel tracing");
1990 ret
= kernel_start_session(cmd_ctx
->session
->kernel_session
);
1992 ERR("Kernel start session failed");
1993 ret
= LTTCOMM_KERN_START_FAIL
;
1997 /* Quiescent wait after starting trace */
1998 kernel_wait_quiescent(kernel_tracer_fd
);
2001 /* TODO: Start all UST traces */
2006 case LTTNG_STOP_TRACE
:
2008 struct ltt_kernel_channel
*chan
;
2009 /* Setup lttng message with no payload */
2010 ret
= setup_lttng_msg(cmd_ctx
, 0);
2016 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2017 DBG("Stop kernel tracing");
2019 ret
= kernel_metadata_flush_buffer(cmd_ctx
->session
->kernel_session
->metadata_stream_fd
);
2021 ERR("Kernel metadata flush failed");
2024 cds_list_for_each_entry(chan
, &cmd_ctx
->session
->kernel_session
->channel_list
.head
, list
) {
2025 ret
= kernel_flush_buffer(chan
);
2027 ERR("Kernel flush buffer error");
2031 ret
= kernel_stop_session(cmd_ctx
->session
->kernel_session
);
2033 ERR("Kernel stop session failed");
2034 ret
= LTTCOMM_KERN_STOP_FAIL
;
2038 /* Quiescent wait after stopping trace */
2039 kernel_wait_quiescent(kernel_tracer_fd
);
2042 /* TODO : User-space tracer */
2047 case LTTNG_CREATE_SESSION
:
2049 /* Setup lttng message with no payload */
2050 ret
= setup_lttng_msg(cmd_ctx
, 0);
2055 ret
= create_session(cmd_ctx
->lsm
->session
.name
, cmd_ctx
->lsm
->session
.path
);
2057 if (ret
== -EEXIST
) {
2058 ret
= LTTCOMM_EXIST_SESS
;
2060 ret
= LTTCOMM_FATAL
;
2068 case LTTNG_DESTROY_SESSION
:
2070 /* Setup lttng message with no payload */
2071 ret
= setup_lttng_msg(cmd_ctx
, 0);
2076 /* Clean kernel session teardown */
2077 teardown_kernel_session(cmd_ctx
->session
);
2079 ret
= destroy_session(cmd_ctx
->lsm
->session
.name
);
2081 ret
= LTTCOMM_FATAL
;
2086 * Must notify the kernel thread here to update it's pollfd in order to
2087 * remove the channel(s)' fd just destroyed.
2089 ret
= notify_kernel_pollfd();
2091 ret
= LTTCOMM_FATAL
;
2098 case LTTNG_LIST_DOMAINS
:
2102 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2106 nb_dom
+= cmd_ctx
->session
->ust_trace_count
;
2108 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_domain
) * nb_dom
);
2113 ((struct lttng_domain
*)(cmd_ctx
->llm
->payload
))[0].type
=
2114 LTTNG_DOMAIN_KERNEL
;
2116 /* TODO: User-space tracer domain support */
2120 case LTTNG_LIST_CHANNELS
:
2123 * TODO: Only kernel channels are listed here. UST listing
2124 * is needed on lttng-ust 2.0 release.
2127 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2128 nb_chan
+= cmd_ctx
->session
->kernel_session
->channel_count
;
2131 ret
= setup_lttng_msg(cmd_ctx
,
2132 sizeof(struct lttng_channel
) * nb_chan
);
2137 list_lttng_channels(cmd_ctx
->session
,
2138 (struct lttng_channel
*)(cmd_ctx
->llm
->payload
));
2143 case LTTNG_LIST_EVENTS
:
2146 * TODO: Only kernel events are listed here. UST listing
2147 * is needed on lttng-ust 2.0 release.
2149 size_t nb_event
= 0;
2150 struct ltt_kernel_channel
*kchan
= NULL
;
2152 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2153 kchan
= get_kernel_channel_by_name(cmd_ctx
->lsm
->u
.list
.channel_name
,
2154 cmd_ctx
->session
->kernel_session
);
2155 if (kchan
== NULL
) {
2156 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2159 nb_event
+= kchan
->event_count
;
2162 ret
= setup_lttng_msg(cmd_ctx
,
2163 sizeof(struct lttng_event
) * nb_event
);
2168 DBG("Listing events (%zu events)", nb_event
);
2170 list_lttng_events(kchan
,
2171 (struct lttng_event
*)(cmd_ctx
->llm
->payload
));
2176 case LTTNG_LIST_SESSIONS
:
2178 lock_session_list();
2180 if (session_list_ptr
->count
== 0) {
2181 ret
= LTTCOMM_NO_SESSION
;
2182 unlock_session_list();
2186 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) *
2187 session_list_ptr
->count
);
2189 unlock_session_list();
2193 /* Filled the session array */
2194 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
));
2196 unlock_session_list();
2201 case LTTNG_CALIBRATE
:
2203 /* Setup lttng message with no payload */
2204 ret
= setup_lttng_msg(cmd_ctx
, 0);
2209 switch (cmd_ctx
->lsm
->domain
.type
) {
2210 case LTTNG_DOMAIN_KERNEL
:
2212 struct lttng_kernel_calibrate kcalibrate
;
2214 kcalibrate
.type
= cmd_ctx
->lsm
->u
.calibrate
.type
;
2215 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2217 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2223 /* TODO: Userspace tracing */
2224 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2230 case LTTNG_REGISTER_CONSUMER
:
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 /* Can't register a consumer if there is already one */
2244 if (cmd_ctx
->session
->kernel_session
->consumer_fd
!= 0) {
2245 ret
= LTTCOMM_CONNECT_FAIL
;
2249 sock
= lttcomm_connect_unix_sock(cmd_ctx
->lsm
->u
.reg
.path
);
2251 ret
= LTTCOMM_CONNECT_FAIL
;
2255 cmd_ctx
->session
->kernel_session
->consumer_fd
= sock
;
2259 /* TODO: Userspace tracing */
2260 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2269 /* Undefined command */
2270 ret
= setup_lttng_msg(cmd_ctx
, 0);
2279 /* Set return code */
2280 cmd_ctx
->llm
->ret_code
= ret
;
2282 if (cmd_ctx
->session
) {
2283 unlock_session(cmd_ctx
->session
);
2289 if (cmd_ctx
->llm
== NULL
) {
2290 DBG("Missing llm structure. Allocating one.");
2291 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
2295 /* Notify client of error */
2296 cmd_ctx
->llm
->ret_code
= ret
;
2299 if (cmd_ctx
->session
) {
2300 unlock_session(cmd_ctx
->session
);
2306 * This thread manage all clients request using the unix client socket for
2309 static void *thread_manage_clients(void *data
)
2312 struct command_ctx
*cmd_ctx
= NULL
;
2313 struct pollfd pollfd
[2];
2315 DBG("[thread] Manage client started");
2317 ret
= lttcomm_listen_unix_sock(client_sock
);
2322 /* First fd is always the quit pipe */
2323 pollfd
[0].fd
= thread_quit_pipe
[0];
2326 pollfd
[1].fd
= client_sock
;
2327 pollfd
[1].events
= POLLIN
;
2329 /* Notify parent pid that we are ready
2330 * to accept command for client side.
2332 if (opt_sig_parent
) {
2333 kill(ppid
, SIGCHLD
);
2337 DBG("Accepting client command ...");
2339 /* Inifinite blocking call, waiting for transmission */
2340 ret
= poll(pollfd
, 2, -1);
2342 perror("poll client thread");
2346 /* Thread quit pipe has been closed. Killing thread. */
2347 if (pollfd
[0].revents
== POLLNVAL
) {
2349 } else if (pollfd
[1].revents
== POLLERR
) {
2350 ERR("Client socket poll error");
2354 sock
= lttcomm_accept_unix_sock(client_sock
);
2359 /* Allocate context command to process the client request */
2360 cmd_ctx
= malloc(sizeof(struct command_ctx
));
2362 /* Allocate data buffer for reception */
2363 cmd_ctx
->lsm
= malloc(sizeof(struct lttcomm_session_msg
));
2364 cmd_ctx
->llm
= NULL
;
2365 cmd_ctx
->session
= NULL
;
2368 * Data is received from the lttng client. The struct
2369 * lttcomm_session_msg (lsm) contains the command and data request of
2372 DBG("Receiving data from client ...");
2373 ret
= lttcomm_recv_unix_sock(sock
, cmd_ctx
->lsm
, sizeof(struct lttcomm_session_msg
));
2378 // TODO: Validate cmd_ctx including sanity check for security purpose.
2381 * This function dispatch the work to the kernel or userspace tracer
2382 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2383 * informations for the client. The command context struct contains
2384 * everything this function may needs.
2386 ret
= process_client_msg(cmd_ctx
);
2388 /* TODO: Inform client somehow of the fatal error. At this point,
2389 * ret < 0 means that a malloc failed (ENOMEM). */
2390 /* Error detected but still accept command */
2391 clean_command_ctx(&cmd_ctx
);
2395 DBG("Sending response (size: %d, retcode: %d)",
2396 cmd_ctx
->lttng_msg_size
, cmd_ctx
->llm
->ret_code
);
2397 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
2399 ERR("Failed to send data back to client");
2402 clean_command_ctx(&cmd_ctx
);
2404 /* End of transmission */
2409 DBG("Client thread dying");
2417 unlink(client_unix_sock_path
);
2419 clean_command_ctx(&cmd_ctx
);
2425 * usage function on stderr
2427 static void usage(void)
2429 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
2430 fprintf(stderr
, " -h, --help Display this usage.\n");
2431 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
2432 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
2433 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
2434 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
2435 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
2436 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
2437 fprintf(stderr
, " -V, --version Show version number.\n");
2438 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
2439 fprintf(stderr
, " -q, --quiet No output at all.\n");
2440 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
2441 fprintf(stderr
, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n");
2445 * daemon argument parsing
2447 static int parse_args(int argc
, char **argv
)
2451 static struct option long_options
[] = {
2452 { "client-sock", 1, 0, 'c' },
2453 { "apps-sock", 1, 0, 'a' },
2454 { "kconsumerd-cmd-sock", 1, 0, 0 },
2455 { "kconsumerd-err-sock", 1, 0, 0 },
2456 { "daemonize", 0, 0, 'd' },
2457 { "sig-parent", 0, 0, 'S' },
2458 { "help", 0, 0, 'h' },
2459 { "group", 1, 0, 'g' },
2460 { "version", 0, 0, 'V' },
2461 { "quiet", 0, 0, 'q' },
2462 { "verbose", 0, 0, 'v' },
2463 { "verbose-kconsumerd", 0, 0, 'Z' },
2468 int option_index
= 0;
2469 c
= getopt_long(argc
, argv
, "dhqvVS" "a:c:g:s:E:C:Z", long_options
, &option_index
);
2476 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
2478 fprintf(stderr
, " with arg %s\n", optarg
);
2482 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2485 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2491 opt_tracing_group
= strdup(optarg
);
2497 fprintf(stdout
, "%s\n", VERSION
);
2503 snprintf(kconsumerd_err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2506 snprintf(kconsumerd_cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2512 /* Verbose level can increase using multiple -v */
2516 opt_verbose_kconsumerd
+= 1;
2519 /* Unknown option or other error.
2520 * Error is printed by getopt, just return */
2529 * Creates the two needed socket by the daemon.
2530 * apps_sock - The communication socket for all UST apps.
2531 * client_sock - The communication of the cli tool (lttng).
2533 static int init_daemon_socket(void)
2538 old_umask
= umask(0);
2540 /* Create client tool unix socket */
2541 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
2542 if (client_sock
< 0) {
2543 ERR("Create unix sock failed: %s", client_unix_sock_path
);
2548 /* File permission MUST be 660 */
2549 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
2551 ERR("Set file permissions failed: %s", client_unix_sock_path
);
2556 /* Create the application unix socket */
2557 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
2558 if (apps_sock
< 0) {
2559 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
2564 /* File permission MUST be 666 */
2565 ret
= chmod(apps_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
2567 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
2578 * Check if the global socket is available, and if a daemon is answering
2579 * at the other side. If yes, error is returned.
2581 static int check_existing_daemon(void)
2583 if (access(client_unix_sock_path
, F_OK
) < 0 &&
2584 access(apps_unix_sock_path
, F_OK
) < 0)
2586 /* Is there anybody out there ? */
2587 if (lttng_session_daemon_alive())
2594 * Set the tracing group gid onto the client socket.
2596 * Race window between mkdir and chown is OK because we are going from more
2597 * permissive (root.root) to les permissive (root.tracing).
2599 static int set_permissions(void)
2604 gid
= allowed_group();
2607 WARN("No tracing group detected");
2610 ERR("Missing tracing group. Aborting execution.");
2616 /* Set lttng run dir */
2617 ret
= chown(LTTNG_RUNDIR
, 0, gid
);
2619 ERR("Unable to set group on " LTTNG_RUNDIR
);
2623 /* lttng client socket path */
2624 ret
= chown(client_unix_sock_path
, 0, gid
);
2626 ERR("Unable to set group on %s", client_unix_sock_path
);
2630 /* kconsumerd error socket path */
2631 ret
= chown(kconsumerd_err_unix_sock_path
, 0, gid
);
2633 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path
);
2637 DBG("All permissions are set");
2644 * Create the pipe used to wake up the kernel thread.
2646 static int create_kernel_poll_pipe(void)
2648 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
2652 * Create the lttng run directory needed for all global sockets and pipe.
2654 static int create_lttng_rundir(void)
2658 ret
= mkdir(LTTNG_RUNDIR
, S_IRWXU
| S_IRWXG
);
2660 if (errno
!= EEXIST
) {
2661 ERR("Unable to create " LTTNG_RUNDIR
);
2673 * Setup sockets and directory needed by the kconsumerd communication with the
2676 static int set_kconsumerd_sockets(void)
2680 if (strlen(kconsumerd_err_unix_sock_path
) == 0) {
2681 snprintf(kconsumerd_err_unix_sock_path
, PATH_MAX
, KCONSUMERD_ERR_SOCK_PATH
);
2684 if (strlen(kconsumerd_cmd_unix_sock_path
) == 0) {
2685 snprintf(kconsumerd_cmd_unix_sock_path
, PATH_MAX
, KCONSUMERD_CMD_SOCK_PATH
);
2688 ret
= mkdir(KCONSUMERD_PATH
, S_IRWXU
| S_IRWXG
);
2690 if (errno
!= EEXIST
) {
2691 ERR("Failed to create " KCONSUMERD_PATH
);
2697 /* Create the kconsumerd error unix socket */
2698 kconsumerd_err_sock
= lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path
);
2699 if (kconsumerd_err_sock
< 0) {
2700 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path
);
2705 /* File permission MUST be 660 */
2706 ret
= chmod(kconsumerd_err_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
2708 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path
);
2718 * Signal handler for the daemon
2720 * Simply stop all worker threads, leaving main() return gracefully
2721 * after joining all threads and calling cleanup().
2723 static void sighandler(int sig
)
2727 DBG("SIGPIPE catched");
2730 DBG("SIGINT catched");
2734 DBG("SIGTERM catched");
2743 * Setup signal handler for :
2744 * SIGINT, SIGTERM, SIGPIPE
2746 static int set_signal_handler(void)
2749 struct sigaction sa
;
2752 if ((ret
= sigemptyset(&sigset
)) < 0) {
2753 perror("sigemptyset");
2757 sa
.sa_handler
= sighandler
;
2758 sa
.sa_mask
= sigset
;
2760 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
2761 perror("sigaction");
2765 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
2766 perror("sigaction");
2770 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
2771 perror("sigaction");
2775 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
2781 * Set open files limit to unlimited. This daemon can open a large number of
2782 * file descriptors in order to consumer multiple kernel traces.
2784 static void set_ulimit(void)
2789 /* The kernel does not allowed an infinite limit for open files */
2790 lim
.rlim_cur
= 65535;
2791 lim
.rlim_max
= 65535;
2793 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
2795 perror("failed to set open files limit");
2802 int main(int argc
, char **argv
)
2806 const char *home_path
;
2808 /* Create thread quit pipe */
2809 if ((ret
= init_thread_quit_pipe()) < 0) {
2813 /* Parse arguments */
2815 if ((ret
= parse_args(argc
, argv
) < 0)) {
2828 /* Check if daemon is UID = 0 */
2829 is_root
= !getuid();
2832 ret
= create_lttng_rundir();
2837 if (strlen(apps_unix_sock_path
) == 0) {
2838 snprintf(apps_unix_sock_path
, PATH_MAX
,
2839 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
2842 if (strlen(client_unix_sock_path
) == 0) {
2843 snprintf(client_unix_sock_path
, PATH_MAX
,
2844 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
2847 home_path
= get_home_dir();
2848 if (home_path
== NULL
) {
2849 /* TODO: Add --socket PATH option */
2850 ERR("Can't get HOME directory for sockets creation.");
2855 if (strlen(apps_unix_sock_path
) == 0) {
2856 snprintf(apps_unix_sock_path
, PATH_MAX
,
2857 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
2860 /* Set the cli tool unix socket path */
2861 if (strlen(client_unix_sock_path
) == 0) {
2862 snprintf(client_unix_sock_path
, PATH_MAX
,
2863 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
2867 DBG("Client socket path %s", client_unix_sock_path
);
2868 DBG("Application socket path %s", apps_unix_sock_path
);
2871 * See if daemon already exist.
2873 if ((ret
= check_existing_daemon()) < 0) {
2874 ERR("Already running daemon.\n");
2876 * We do not goto exit because we must not cleanup()
2877 * because a daemon is already running.
2882 /* After this point, we can safely call cleanup() so goto error is used */
2885 * These actions must be executed as root. We do that *after* setting up
2886 * the sockets path because we MUST make the check for another daemon using
2887 * those paths *before* trying to set the kernel consumer sockets and init
2891 ret
= set_kconsumerd_sockets();
2896 /* Setup kernel tracer */
2897 init_kernel_tracer();
2899 /* Set ulimit for open files */
2903 if ((ret
= set_signal_handler()) < 0) {
2907 /* Setup the needed unix socket */
2908 if ((ret
= init_daemon_socket()) < 0) {
2912 /* Set credentials to socket */
2913 if (is_root
&& ((ret
= set_permissions()) < 0)) {
2917 /* Get parent pid if -S, --sig-parent is specified. */
2918 if (opt_sig_parent
) {
2922 /* Setup the kernel pipe for waking up the kernel thread */
2923 if ((ret
= create_kernel_poll_pipe()) < 0) {
2928 * Get session list pointer. This pointer MUST NOT be free().
2929 * This list is statically declared in session.c
2931 session_list_ptr
= get_session_list();
2933 /* Create thread to manage the client socket */
2934 ret
= pthread_create(&client_thread
, NULL
, thread_manage_clients
, (void *) NULL
);
2936 perror("pthread_create");
2940 /* Create thread to manage application socket */
2941 ret
= pthread_create(&apps_thread
, NULL
, thread_manage_apps
, (void *) NULL
);
2943 perror("pthread_create");
2947 /* Create kernel thread to manage kernel event */
2948 ret
= pthread_create(&kernel_thread
, NULL
, thread_manage_kernel
, (void *) NULL
);
2950 perror("pthread_create");
2954 ret
= pthread_join(kernel_thread
, &status
);
2956 perror("pthread_join");
2957 goto error
; /* join error, exit without cleanup */
2961 ret
= pthread_join(apps_thread
, &status
);
2963 perror("pthread_join");
2964 goto error
; /* join error, exit without cleanup */
2968 ret
= pthread_join(client_thread
, &status
);
2970 perror("pthread_join");
2971 goto error
; /* join error, exit without cleanup */
2974 ret
= join_kconsumerd_thread();
2976 perror("join_kconsumerd");
2977 goto error
; /* join error, exit without cleanup */
2983 * cleanup() is called when no other thread is running.