2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * 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>
34 #include <sys/resource.h>
35 #include <sys/socket.h>
37 #include <sys/types.h>
39 #include <urcu/futex.h>
42 #include <ltt-kconsumerd.h>
43 #include <lttng-sessiond-comm.h>
44 #include <lttng/lttng-kconsumerd.h>
49 #include "kernel-ctl.h"
50 #include "ltt-sessiond.h"
52 #include "traceable-app.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
;
76 static int dispatch_thread_exit
;
78 static char apps_unix_sock_path
[PATH_MAX
]; /* Global application Unix socket path */
79 static char client_unix_sock_path
[PATH_MAX
]; /* Global client Unix socket path */
80 static char kconsumerd_err_unix_sock_path
[PATH_MAX
]; /* kconsumerd error Unix socket path */
81 static char kconsumerd_cmd_unix_sock_path
[PATH_MAX
]; /* kconsumerd command Unix socket path */
82 static char wait_shm_path
[PATH_MAX
]; /* global wait shm path for UST */
85 static int client_sock
;
87 static int kconsumerd_err_sock
;
88 static int kconsumerd_cmd_sock
;
89 static int kernel_tracer_fd
;
90 static int kernel_poll_pipe
[2];
93 * Quit pipe for all threads. This permits a single cancellation point
94 * for all threads when receiving an event on the pipe.
96 static int thread_quit_pipe
[2];
99 * This pipe is used to inform the thread managing application communication
100 * that a command is queued and ready to be processed.
102 static int apps_cmd_pipe
[2];
104 /* Pthread, Mutexes and Semaphores */
105 static pthread_t kconsumerd_thread
;
106 static pthread_t apps_thread
;
107 static pthread_t reg_apps_thread
;
108 static pthread_t client_thread
;
109 static pthread_t kernel_thread
;
110 static pthread_t dispatch_thread
;
111 static sem_t kconsumerd_sem
;
113 static pthread_mutex_t kconsumerd_pid_mutex
; /* Mutex to control kconsumerd pid assignation */
116 * UST registration command queue. This queue is tied with a futex and uses a N
117 * wakers / 1 waiter implemented and detailed in futex.c/.h
119 * The thread_manage_apps and thread_dispatch_ust_registration interact with
120 * this queue and the wait/wake scheme.
122 static struct ust_cmd_queue ust_cmd_queue
;
125 * Pointer initialized before thread creation.
127 * This points to the tracing session list containing the session count and a
128 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
129 * MUST NOT be taken if you call a public function in session.c.
131 * The lock is nested inside the structure: session_list_ptr->lock. Please use
132 * lock_session_list and unlock_session_list for lock acquisition.
134 static struct ltt_session_list
*session_list_ptr
;
137 * Remove modules in reverse load order.
139 static int modprobe_remove_kernel_modules(void)
144 for (i
= ARRAY_SIZE(kernel_modules_list
) - 1; i
>= 0; i
--) {
145 ret
= snprintf(modprobe
, sizeof(modprobe
),
146 "/sbin/modprobe --remove --quiet %s",
147 kernel_modules_list
[i
].name
);
149 perror("snprintf modprobe --remove");
152 modprobe
[sizeof(modprobe
) - 1] = '\0';
153 ret
= system(modprobe
);
155 ERR("Unable to launch modprobe --remove for module %s",
156 kernel_modules_list
[i
].name
);
157 } else if (kernel_modules_list
[i
].required
158 && WEXITSTATUS(ret
) != 0) {
159 ERR("Unable to remove module %s",
160 kernel_modules_list
[i
].name
);
162 DBG("Modprobe removal successful %s",
163 kernel_modules_list
[i
].name
);
172 * Return group ID of the tracing group or -1 if not found.
174 static gid_t
allowed_group(void)
178 if (opt_tracing_group
) {
179 grp
= getgrnam(opt_tracing_group
);
181 grp
= getgrnam(default_tracing_group
);
193 * Return -1 on error or 0 if all pipes are created.
195 static int init_thread_quit_pipe(void)
199 ret
= pipe2(thread_quit_pipe
, O_CLOEXEC
);
201 perror("thread quit pipe");
210 * Complete teardown of a kernel session. This free all data structure related
211 * to a kernel session and update counter.
213 static void teardown_kernel_session(struct ltt_session
*session
)
215 if (session
->kernel_session
!= NULL
) {
216 DBG("Tearing down kernel session");
219 * If a custom kernel consumer was registered, close the socket before
220 * tearing down the complete kernel session structure
222 if (session
->kernel_session
->consumer_fd
!= kconsumerd_cmd_sock
) {
223 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
226 trace_kernel_destroy_session(session
->kernel_session
);
227 /* Extra precaution */
228 session
->kernel_session
= NULL
;
233 * Stop all threads by closing the thread quit pipe.
235 static void stop_threads(void)
237 /* Stopping all threads */
238 DBG("Terminating all threads");
239 close(thread_quit_pipe
[0]);
240 close(thread_quit_pipe
[1]);
241 /* Dispatch thread */
242 dispatch_thread_exit
= 1;
243 futex_nto1_wake(&ust_cmd_queue
.futex
);
249 static void cleanup(void)
253 struct ltt_session
*sess
, *stmp
;
258 MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm"
259 "Matthew, BEET driven development works!%c[%dm",
260 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
263 DBG("Removing %s directory", LTTNG_RUNDIR
);
264 ret
= asprintf(&cmd
, "rm -rf " LTTNG_RUNDIR
);
266 ERR("asprintf failed. Something is really wrong!");
269 /* Remove lttng run directory */
272 ERR("Unable to clean " LTTNG_RUNDIR
);
275 DBG("Cleaning up all session");
277 /* Destroy session list mutex */
278 if (session_list_ptr
!= NULL
) {
279 pthread_mutex_destroy(&session_list_ptr
->lock
);
281 /* Cleanup ALL session */
282 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
283 teardown_kernel_session(sess
);
284 // TODO complete session cleanup (including UST)
288 DBG("Closing all UST sockets");
289 clean_traceable_apps_list();
291 pthread_mutex_destroy(&kconsumerd_pid_mutex
);
293 DBG("Closing kernel fd");
294 close(kernel_tracer_fd
);
297 DBG("Unloading kernel modules");
298 modprobe_remove_kernel_modules();
303 * Send data on a unix socket using the liblttsessiondcomm API.
305 * Return lttcomm error code.
307 static int send_unix_sock(int sock
, void *buf
, size_t len
)
309 /* Check valid length */
314 return lttcomm_send_unix_sock(sock
, buf
, len
);
318 * Free memory of a command context structure.
320 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
322 DBG("Clean command context structure");
324 if ((*cmd_ctx
)->llm
) {
325 free((*cmd_ctx
)->llm
);
327 if ((*cmd_ctx
)->lsm
) {
328 free((*cmd_ctx
)->lsm
);
336 * Send all stream fds of kernel channel to the consumer.
338 static int send_kconsumerd_channel_fds(int sock
, struct ltt_kernel_channel
*channel
)
342 struct ltt_kernel_stream
*stream
;
343 struct lttcomm_kconsumerd_header lkh
;
344 struct lttcomm_kconsumerd_msg lkm
;
346 DBG("Sending fds of channel %s to kernel consumer", channel
->channel
->name
);
348 nb_fd
= channel
->stream_count
;
351 lkh
.payload_size
= nb_fd
* sizeof(struct lttcomm_kconsumerd_msg
);
352 lkh
.cmd_type
= ADD_STREAM
;
354 DBG("Sending kconsumerd header");
356 ret
= lttcomm_send_unix_sock(sock
, &lkh
, sizeof(struct lttcomm_kconsumerd_header
));
358 perror("send kconsumerd header");
362 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
363 if (stream
->fd
!= 0) {
365 lkm
.state
= stream
->state
;
366 lkm
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
367 lkm
.output
= channel
->channel
->attr
.output
;
368 strncpy(lkm
.path_name
, stream
->pathname
, PATH_MAX
);
369 lkm
.path_name
[PATH_MAX
- 1] = '\0';
371 DBG("Sending fd %d to kconsumerd", lkm
.fd
);
373 ret
= lttcomm_send_fds_unix_sock(sock
, &lkm
, &lkm
.fd
, 1, sizeof(lkm
));
375 perror("send kconsumerd fd");
381 DBG("Kconsumerd channel fds sent");
390 * Send all stream fds of the kernel session to the consumer.
392 static int send_kconsumerd_fds(struct ltt_kernel_session
*session
)
395 struct ltt_kernel_channel
*chan
;
396 struct lttcomm_kconsumerd_header lkh
;
397 struct lttcomm_kconsumerd_msg lkm
;
400 lkh
.payload_size
= sizeof(struct lttcomm_kconsumerd_msg
);
401 lkh
.cmd_type
= ADD_STREAM
;
403 DBG("Sending kconsumerd header for metadata");
405 ret
= lttcomm_send_unix_sock(session
->consumer_fd
, &lkh
, sizeof(struct lttcomm_kconsumerd_header
));
407 perror("send kconsumerd header");
411 DBG("Sending metadata stream fd");
413 /* Extra protection. It's NOT suppose to be set to 0 at this point */
414 if (session
->consumer_fd
== 0) {
415 session
->consumer_fd
= kconsumerd_cmd_sock
;
418 if (session
->metadata_stream_fd
!= 0) {
419 /* Send metadata stream fd first */
420 lkm
.fd
= session
->metadata_stream_fd
;
421 lkm
.state
= ACTIVE_FD
;
422 lkm
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
423 lkm
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
424 strncpy(lkm
.path_name
, session
->metadata
->pathname
, PATH_MAX
);
425 lkm
.path_name
[PATH_MAX
- 1] = '\0';
427 ret
= lttcomm_send_fds_unix_sock(session
->consumer_fd
, &lkm
, &lkm
.fd
, 1, sizeof(lkm
));
429 perror("send kconsumerd fd");
434 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
435 ret
= send_kconsumerd_channel_fds(session
->consumer_fd
, chan
);
441 DBG("Kconsumerd fds (metadata and channel streams) sent");
450 * Notify UST applications using the shm mmap futex.
452 static int notify_ust_apps(int active
)
456 DBG("Notifying applications of session daemon state: %d", active
);
458 /* See shm.c for this call implying mmap, shm and futex calls */
459 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
460 if (wait_shm_mmap
== NULL
) {
464 /* Wake waiting process */
465 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
467 /* Apps notified successfully */
475 * Setup the outgoing data buffer for the response (llm) by allocating the
476 * right amount of memory and copying the original information from the lsm
479 * Return total size of the buffer pointed by buf.
481 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
487 cmd_ctx
->llm
= malloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
488 if (cmd_ctx
->llm
== NULL
) {
494 /* Copy common data */
495 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
496 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
498 cmd_ctx
->llm
->data_size
= size
;
499 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
508 * Update the kernel pollfd set of all channel fd available over all tracing
509 * session. Add the wakeup pipe at the end of the set.
511 static int update_kernel_pollfd(void)
515 * The wakup pipe and the quit pipe are needed so the number of fds starts
516 * at 2 for those pipes.
518 unsigned int nb_fd
= 2;
519 struct ltt_session
*session
;
520 struct ltt_kernel_channel
*channel
;
522 DBG("Updating kernel_pollfd");
524 /* Get the number of channel of all kernel session */
526 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
527 lock_session(session
);
528 if (session
->kernel_session
== NULL
) {
529 unlock_session(session
);
532 nb_fd
+= session
->kernel_session
->channel_count
;
533 unlock_session(session
);
536 DBG("Resizing kernel_pollfd to size %d", nb_fd
);
538 kernel_pollfd
= realloc(kernel_pollfd
, nb_fd
* sizeof(struct pollfd
));
539 if (kernel_pollfd
== NULL
) {
540 perror("malloc kernel_pollfd");
544 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
545 lock_session(session
);
546 if (session
->kernel_session
== NULL
) {
547 unlock_session(session
);
551 ERR("To much channel for kernel_pollfd size");
552 unlock_session(session
);
555 cds_list_for_each_entry(channel
, &session
->kernel_session
->channel_list
.head
, list
) {
556 kernel_pollfd
[i
].fd
= channel
->fd
;
557 kernel_pollfd
[i
].events
= POLLIN
| POLLRDNORM
;
560 unlock_session(session
);
562 unlock_session_list();
564 /* Adding wake up pipe */
565 kernel_pollfd
[nb_fd
- 2].fd
= kernel_poll_pipe
[0];
566 kernel_pollfd
[nb_fd
- 2].events
= POLLIN
;
568 /* Adding the quit pipe */
569 kernel_pollfd
[nb_fd
- 1].fd
= thread_quit_pipe
[0];
574 unlock_session_list();
579 * Find the channel fd from 'fd' over all tracing session. When found, check
580 * for new channel stream and send those stream fds to the kernel consumer.
582 * Useful for CPU hotplug feature.
584 static int update_kernel_stream(int fd
)
587 struct ltt_session
*session
;
588 struct ltt_kernel_channel
*channel
;
590 DBG("Updating kernel streams for channel fd %d", fd
);
593 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
594 lock_session(session
);
595 if (session
->kernel_session
== NULL
) {
596 unlock_session(session
);
600 /* This is not suppose to be 0 but this is an extra security check */
601 if (session
->kernel_session
->consumer_fd
== 0) {
602 session
->kernel_session
->consumer_fd
= kconsumerd_cmd_sock
;
605 cds_list_for_each_entry(channel
, &session
->kernel_session
->channel_list
.head
, list
) {
606 if (channel
->fd
== fd
) {
607 DBG("Channel found, updating kernel streams");
608 ret
= kernel_open_channel_stream(channel
);
614 * Have we already sent fds to the consumer? If yes, it means that
615 * tracing is started so it is safe to send our updated stream fds.
617 if (session
->kernel_session
->kconsumer_fds_sent
== 1) {
618 ret
= send_kconsumerd_channel_fds(session
->kernel_session
->consumer_fd
,
627 unlock_session(session
);
631 unlock_session_list();
633 unlock_session(session
);
639 * This thread manage event coming from the kernel.
641 * Features supported in this thread:
644 static void *thread_manage_kernel(void *data
)
646 int ret
, i
, nb_fd
= 0;
648 int update_poll_flag
= 1;
650 DBG("Thread manage kernel started");
653 if (update_poll_flag
== 1) {
654 nb_fd
= update_kernel_pollfd();
658 update_poll_flag
= 0;
661 DBG("Polling on %d fds", nb_fd
);
663 /* Poll infinite value of time */
664 ret
= poll(kernel_pollfd
, nb_fd
, -1);
666 perror("poll kernel thread");
668 } else if (ret
== 0) {
669 /* Should not happen since timeout is infinite */
673 /* Thread quit pipe has been closed. Killing thread. */
674 if (kernel_pollfd
[nb_fd
- 1].revents
== POLLNVAL
) {
678 DBG("Kernel poll event triggered");
681 * Check if the wake up pipe was triggered. If so, the kernel_pollfd
684 switch (kernel_pollfd
[nb_fd
- 2].revents
) {
686 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
687 update_poll_flag
= 1;
695 for (i
= 0; i
< nb_fd
; i
++) {
696 switch (kernel_pollfd
[i
].revents
) {
698 * New CPU detected by the kernel. Adding kernel stream to kernel
699 * session and updating the kernel consumer
701 case POLLIN
| POLLRDNORM
:
702 ret
= update_kernel_stream(kernel_pollfd
[i
].fd
);
712 DBG("Kernel thread dying");
717 close(kernel_poll_pipe
[0]);
718 close(kernel_poll_pipe
[1]);
723 * This thread manage the kconsumerd error sent back to the session daemon.
725 static void *thread_manage_kconsumerd(void *data
)
728 enum lttcomm_return_code code
;
729 struct pollfd pollfd
[2];
731 DBG("[thread] Manage kconsumerd started");
733 ret
= lttcomm_listen_unix_sock(kconsumerd_err_sock
);
738 /* First fd is always the quit pipe */
739 pollfd
[0].fd
= thread_quit_pipe
[0];
742 pollfd
[1].fd
= kconsumerd_err_sock
;
743 pollfd
[1].events
= POLLIN
;
745 /* Inifinite blocking call, waiting for transmission */
746 ret
= poll(pollfd
, 2, -1);
748 perror("poll kconsumerd thread");
752 /* Thread quit pipe has been closed. Killing thread. */
753 if (pollfd
[0].revents
== POLLNVAL
) {
755 } else if (pollfd
[1].revents
== POLLERR
) {
756 ERR("Kconsumerd err socket poll error");
760 sock
= lttcomm_accept_unix_sock(kconsumerd_err_sock
);
765 /* Getting status code from kconsumerd */
766 ret
= lttcomm_recv_unix_sock(sock
, &code
, sizeof(enum lttcomm_return_code
));
771 if (code
== KCONSUMERD_COMMAND_SOCK_READY
) {
772 kconsumerd_cmd_sock
= lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path
);
773 if (kconsumerd_cmd_sock
< 0) {
774 sem_post(&kconsumerd_sem
);
775 perror("kconsumerd connect");
778 /* Signal condition to tell that the kconsumerd is ready */
779 sem_post(&kconsumerd_sem
);
780 DBG("Kconsumerd command socket ready");
782 DBG("Kconsumerd error when waiting for SOCK_READY : %s",
783 lttcomm_get_readable_code(-code
));
787 /* Kconsumerd err socket */
789 pollfd
[1].events
= POLLIN
;
791 /* Inifinite blocking call, waiting for transmission */
792 ret
= poll(pollfd
, 2, -1);
794 perror("poll kconsumerd thread");
798 /* Thread quit pipe has been closed. Killing thread. */
799 if (pollfd
[0].revents
== POLLNVAL
) {
801 } else if (pollfd
[1].revents
== POLLERR
) {
802 ERR("Kconsumerd err socket second poll error");
806 /* Wait for any kconsumerd error */
807 ret
= lttcomm_recv_unix_sock(sock
, &code
, sizeof(enum lttcomm_return_code
));
809 ERR("Kconsumerd closed the command socket");
813 ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code
));
816 DBG("Kconsumerd thread dying");
817 if (kconsumerd_err_sock
) {
818 close(kconsumerd_err_sock
);
820 if (kconsumerd_cmd_sock
) {
821 close(kconsumerd_cmd_sock
);
827 unlink(kconsumerd_err_unix_sock_path
);
828 unlink(kconsumerd_cmd_unix_sock_path
);
835 * Reallocate the apps command pollfd structure of nb_fd size.
837 * The first two fds must be there at all time.
839 static int update_apps_cmd_pollfd(unsigned int nb_fd
, unsigned int old_nb_fd
,
840 struct pollfd
**pollfd
)
843 struct pollfd
*old_pollfd
= NULL
;
845 /* Can't accept pollfd less than 2 */
852 old_pollfd
= *pollfd
;
855 *pollfd
= malloc(nb_fd
* sizeof(struct pollfd
));
856 if (*pollfd
== NULL
) {
857 perror("malloc manage apps pollfd");
861 /* First fd is always the quit pipe */
862 (*pollfd
)[0].fd
= thread_quit_pipe
[0];
863 /* Apps command pipe */
864 (*pollfd
)[1].fd
= apps_cmd_pipe
[0];
865 (*pollfd
)[1].events
= POLLIN
;
867 /* Start count after the two pipes below */
869 for (i
= 2; i
< old_nb_fd
; i
++) {
870 /* Add to new pollfd */
871 if (old_pollfd
[i
].fd
!= -1) {
872 (*pollfd
)[count
].fd
= old_pollfd
[i
].fd
;
873 (*pollfd
)[count
].events
= POLLHUP
| POLLNVAL
| POLLERR
;
878 ERR("Updating poll fd wrong size");
883 /* Destroy old pollfd */
886 DBG("Apps cmd pollfd realloc of size %d", nb_fd
);
892 /* Destroy old pollfd */
898 * This thread manage application communication.
900 static void *thread_manage_apps(void *data
)
903 unsigned int nb_fd
= 2;
904 int update_poll_flag
= 1;
905 struct pollfd
*pollfd
= NULL
;
906 struct ust_command ust_cmd
;
908 DBG("[thread] Manage application started");
913 /* See if we have a valid socket to add to pollfd */
914 if (ust_cmd
.sock
!= -1) {
916 update_poll_flag
= 1;
919 /* The pollfd struct must be updated */
920 if (update_poll_flag
) {
921 ret
= update_apps_cmd_pollfd(nb_fd
, ARRAY_SIZE(pollfd
), &pollfd
);
923 /* malloc failed so we quit */
927 if (ust_cmd
.sock
!= -1) {
928 /* Update pollfd with the new UST socket */
929 DBG("Adding sock %d to apps cmd pollfd", ust_cmd
.sock
);
930 pollfd
[nb_fd
- 1].fd
= ust_cmd
.sock
;
931 pollfd
[nb_fd
- 1].events
= POLLHUP
| POLLNVAL
| POLLERR
;
936 DBG("Apps thread polling on %d fds", nb_fd
);
938 /* Inifinite blocking call, waiting for transmission */
939 ret
= poll(pollfd
, nb_fd
, -1);
941 perror("poll apps thread");
945 /* Thread quit pipe has been closed. Killing thread. */
946 if (pollfd
[0].revents
== POLLNVAL
) {
949 /* apps_cmd_pipe pipe events */
950 switch (pollfd
[1].revents
) {
952 ERR("Apps command pipe poll error");
956 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
957 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
958 perror("read apps cmd pipe");
962 /* Register applicaton to the session daemon */
963 ret
= register_traceable_app(&ust_cmd
.reg_msg
, ust_cmd
.sock
);
965 /* Only critical ENOMEM error can be returned here */
969 ret
= ustctl_register_done(ust_cmd
.sock
);
972 * If the registration is not possible, we simply unregister
973 * the apps and continue
975 unregister_traceable_app(ust_cmd
.sock
);
982 for (i
= 2; i
< count
; i
++) {
983 /* Apps socket is closed/hungup */
984 switch (pollfd
[i
].revents
) {
989 unregister_traceable_app(pollfd
[i
].fd
);
990 /* Indicate to remove this fd from the pollfd */
997 if (nb_fd
!= count
) {
998 update_poll_flag
= 1;
1003 DBG("Application communication apps dying");
1004 close(apps_cmd_pipe
[0]);
1005 close(apps_cmd_pipe
[1]);
1013 * Dispatch request from the registration threads to the application
1014 * communication thread.
1016 static void *thread_dispatch_ust_registration(void *data
)
1019 struct cds_wfq_node
*node
;
1020 struct ust_command
*ust_cmd
= NULL
;
1022 DBG("[thread] Dispatch UST command started");
1024 while (!dispatch_thread_exit
) {
1025 /* Atomically prepare the queue futex */
1026 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1029 /* Dequeue command for registration */
1030 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1032 DBG("Waked up but nothing in the UST command queue");
1033 /* Continue thread execution */
1037 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1039 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1040 " gid:%d sock:%d name:%s (version %d.%d)",
1041 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1042 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1043 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1044 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1046 * Inform apps thread of the new application registration. This
1047 * call is blocking so we can be assured that the data will be read
1048 * at some point in time or wait to the end of the world :)
1050 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1051 sizeof(struct ust_command
));
1053 perror("write apps cmd pipe");
1054 if (errno
== EBADF
) {
1056 * We can't inform the application thread to process
1057 * registration. We will exit or else application
1058 * registration will not occur and tracing will never
1065 } while (node
!= NULL
);
1067 /* Futex wait on queue. Blocking call on futex() */
1068 futex_nto1_wait(&ust_cmd_queue
.futex
);
1072 DBG("Dispatch thread dying");
1077 * This thread manage application registration.
1079 static void *thread_registration_apps(void *data
)
1082 struct pollfd pollfd
[2];
1084 * Get allocated in this thread, enqueued to a global queue, dequeued and
1085 * freed in the manage apps thread.
1087 struct ust_command
*ust_cmd
= NULL
;
1089 DBG("[thread] Manage application registration started");
1091 ret
= lttcomm_listen_unix_sock(apps_sock
);
1096 /* First fd is always the quit pipe */
1097 pollfd
[0].fd
= thread_quit_pipe
[0];
1100 pollfd
[1].fd
= apps_sock
;
1101 pollfd
[1].events
= POLLIN
;
1103 /* Notify all applications to register */
1104 ret
= notify_ust_apps(1);
1106 ERR("Failed to notify applications or create the wait shared memory.\n"
1107 "Execution continues but there might be problem for already running\n"
1108 "applications that wishes to register.");
1112 DBG("Accepting application registration");
1114 /* Inifinite blocking call, waiting for transmission */
1115 ret
= poll(pollfd
, 2, -1);
1117 perror("poll register apps thread");
1121 /* Thread quit pipe has been closed. Killing thread. */
1122 if (pollfd
[0].revents
== POLLNVAL
) {
1124 } else if (pollfd
[1].revents
== POLLERR
) {
1125 ERR("Register apps socket poll error");
1129 sock
= lttcomm_accept_unix_sock(apps_sock
);
1134 /* Create UST registration command for enqueuing */
1135 ust_cmd
= malloc(sizeof(struct ust_command
));
1136 if (ust_cmd
== NULL
) {
1137 perror("ust command malloc");
1142 * Using message-based transmissions to ensure we don't have to deal
1143 * with partially received messages.
1145 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1146 sizeof(struct ust_register_msg
));
1147 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1149 perror("lttcomm_recv_unix_sock register apps");
1151 ERR("Wrong size received on apps register");
1158 ust_cmd
->sock
= sock
;
1160 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1161 " gid:%d sock:%d name:%s (version %d.%d)",
1162 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1163 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1164 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1165 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1167 * Lock free enqueue the registration request.
1168 * The red pill has been taken! This apps will be part of the *system*
1170 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1173 * Wake the registration queue futex.
1174 * Implicit memory barrier with the exchange in cds_wfq_enqueue.
1176 futex_nto1_wake(&ust_cmd_queue
.futex
);
1180 DBG("UST Registration thread dying");
1182 /* Notify that the registration thread is gone */
1188 unlink(apps_unix_sock_path
);
1194 * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
1195 * exec or it will fails.
1197 static int spawn_kconsumerd_thread(void)
1201 /* Setup semaphore */
1202 sem_init(&kconsumerd_sem
, 0, 0);
1204 ret
= pthread_create(&kconsumerd_thread
, NULL
, thread_manage_kconsumerd
, (void *) NULL
);
1206 perror("pthread_create kconsumerd");
1210 /* Wait for the kconsumerd thread to be ready */
1211 sem_wait(&kconsumerd_sem
);
1213 if (kconsumerd_pid
== 0) {
1214 ERR("Kconsumerd did not start");
1221 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1226 * Join kernel consumer thread
1228 static int join_kconsumerd_thread(void)
1233 if (kconsumerd_pid
!= 0) {
1234 ret
= kill(kconsumerd_pid
, SIGTERM
);
1236 ERR("Error killing kconsumerd");
1239 return pthread_join(kconsumerd_thread
, &status
);
1246 * Fork and exec a kernel consumer daemon (kconsumerd).
1248 * Return pid if successful else -1.
1250 static pid_t
spawn_kconsumerd(void)
1254 const char *verbosity
;
1256 DBG("Spawning kconsumerd");
1263 if (opt_verbose
> 1 || opt_verbose_kconsumerd
) {
1264 verbosity
= "--verbose";
1266 verbosity
= "--quiet";
1268 execl(INSTALL_BIN_PATH
"/ltt-kconsumerd", "ltt-kconsumerd", verbosity
, NULL
);
1270 perror("kernel start consumer exec");
1273 } else if (pid
> 0) {
1277 perror("kernel start consumer fork");
1287 * Spawn the kconsumerd daemon and session daemon thread.
1289 static int start_kconsumerd(void)
1293 pthread_mutex_lock(&kconsumerd_pid_mutex
);
1294 if (kconsumerd_pid
!= 0) {
1295 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
1299 ret
= spawn_kconsumerd();
1301 ERR("Spawning kconsumerd failed");
1302 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1303 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
1307 /* Setting up the global kconsumerd_pid */
1308 kconsumerd_pid
= ret
;
1309 pthread_mutex_unlock(&kconsumerd_pid_mutex
);
1311 DBG("Kconsumerd pid %d", ret
);
1313 DBG("Spawning kconsumerd thread");
1314 ret
= spawn_kconsumerd_thread();
1316 ERR("Fatal error spawning kconsumerd thread");
1328 * modprobe_kernel_modules
1330 static int modprobe_kernel_modules(void)
1335 for (i
= 0; i
< ARRAY_SIZE(kernel_modules_list
); i
++) {
1336 ret
= snprintf(modprobe
, sizeof(modprobe
),
1337 "/sbin/modprobe %s%s",
1338 kernel_modules_list
[i
].required
? "" : "--quiet ",
1339 kernel_modules_list
[i
].name
);
1341 perror("snprintf modprobe");
1344 modprobe
[sizeof(modprobe
) - 1] = '\0';
1345 ret
= system(modprobe
);
1347 ERR("Unable to launch modprobe for module %s",
1348 kernel_modules_list
[i
].name
);
1349 } else if (kernel_modules_list
[i
].required
1350 && WEXITSTATUS(ret
) != 0) {
1351 ERR("Unable to load module %s",
1352 kernel_modules_list
[i
].name
);
1354 DBG("Modprobe successfully %s",
1355 kernel_modules_list
[i
].name
);
1366 static int mount_debugfs(char *path
)
1369 char *type
= "debugfs";
1371 ret
= mkdir_recursive(path
, S_IRWXU
| S_IRWXG
, geteuid(), getegid());
1376 ret
= mount(type
, path
, type
, 0, NULL
);
1378 perror("mount debugfs");
1382 DBG("Mounted debugfs successfully at %s", path
);
1389 * Setup necessary data for kernel tracer action.
1391 static void init_kernel_tracer(void)
1394 char *proc_mounts
= "/proc/mounts";
1396 char *debugfs_path
= NULL
, *lttng_path
;
1399 /* Detect debugfs */
1400 fp
= fopen(proc_mounts
, "r");
1402 ERR("Unable to probe %s", proc_mounts
);
1406 while (fgets(line
, sizeof(line
), fp
) != NULL
) {
1407 if (strstr(line
, "debugfs") != NULL
) {
1408 /* Remove first string */
1410 /* Dup string here so we can reuse line later on */
1411 debugfs_path
= strdup(strtok(NULL
, " "));
1412 DBG("Got debugfs path : %s", debugfs_path
);
1419 /* Mount debugfs if needded */
1420 if (debugfs_path
== NULL
) {
1421 ret
= asprintf(&debugfs_path
, "/mnt/debugfs");
1423 perror("asprintf debugfs path");
1426 ret
= mount_debugfs(debugfs_path
);
1432 /* Modprobe lttng kernel modules */
1433 ret
= modprobe_kernel_modules();
1438 /* Setup lttng kernel path */
1439 ret
= asprintf(<tng_path
, "%s/lttng", debugfs_path
);
1441 perror("asprintf lttng path");
1445 /* Open debugfs lttng */
1446 kernel_tracer_fd
= open(lttng_path
, O_RDWR
);
1447 if (kernel_tracer_fd
< 0) {
1448 DBG("Failed to open %s", lttng_path
);
1454 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1464 WARN("No kernel tracer available");
1465 kernel_tracer_fd
= 0;
1470 * Start tracing by creating trace directory and sending FDs to the kernel
1473 static int start_kernel_trace(struct ltt_kernel_session
*session
)
1477 if (session
->kconsumer_fds_sent
== 0) {
1479 * Assign default kernel consumer if no consumer assigned to the kernel
1480 * session. At this point, it's NOT suppose to be 0 but this is an extra
1483 if (session
->consumer_fd
== 0) {
1484 session
->consumer_fd
= kconsumerd_cmd_sock
;
1487 ret
= send_kconsumerd_fds(session
);
1489 ERR("Send kconsumerd fds failed");
1490 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1494 session
->kconsumer_fds_sent
= 1;
1502 * Notify kernel thread to update it's pollfd.
1504 static int notify_kernel_pollfd(void)
1508 /* Inform kernel thread of the new kernel channel */
1509 ret
= write(kernel_poll_pipe
[1], "!", 1);
1511 perror("write kernel poll pipe");
1518 * Allocate a channel structure and fill it.
1520 static struct lttng_channel
*init_default_channel(enum lttng_domain_type domain_type
,
1523 struct lttng_channel
*chan
;
1525 chan
= malloc(sizeof(struct lttng_channel
));
1527 perror("init channel malloc");
1531 if (snprintf(chan
->name
, NAME_MAX
, "%s", name
) < 0) {
1532 perror("snprintf channel name");
1536 chan
->attr
.overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
1537 chan
->attr
.switch_timer_interval
= DEFAULT_CHANNEL_SWITCH_TIMER
;
1538 chan
->attr
.read_timer_interval
= DEFAULT_CHANNEL_READ_TIMER
;
1540 switch (domain_type
) {
1541 case LTTNG_DOMAIN_KERNEL
:
1542 chan
->attr
.subbuf_size
= DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE
;
1543 chan
->attr
.num_subbuf
= DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
;
1544 chan
->attr
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
1548 goto error
; /* Not implemented */
1559 * Create an UST session and add it to the session ust list.
1561 static int create_ust_session(pid_t pid
, struct ltt_session
*session
)
1564 struct ltt_ust_session
*lus
;
1566 DBG("Creating UST session");
1568 lus
= trace_ust_create_session(session
->path
, pid
);
1573 ret
= mkdir_recursive(lus
->path
, S_IRWXU
| S_IRWXG
,
1574 geteuid(), allowed_group());
1576 if (ret
!= -EEXIST
) {
1577 ERR("Trace directory creation error");
1582 /* Create session on the UST tracer */
1583 ret
= ustctl_create_session(lus
);
1596 * Create a kernel tracer session then create the default channel.
1598 static int create_kernel_session(struct ltt_session
*session
)
1602 DBG("Creating kernel session");
1604 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1606 ret
= LTTCOMM_KERN_SESS_FAIL
;
1610 /* Set kernel consumer socket fd */
1611 if (kconsumerd_cmd_sock
) {
1612 session
->kernel_session
->consumer_fd
= kconsumerd_cmd_sock
;
1615 ret
= mkdir_recursive(session
->kernel_session
->trace_path
,
1616 S_IRWXU
| S_IRWXG
, geteuid(), allowed_group());
1618 if (ret
!= -EEXIST
) {
1619 ERR("Trace directory creation error");
1629 * Using the session list, filled a lttng_session array to send back to the
1630 * client for session listing.
1632 * The session list lock MUST be acquired before calling this function. Use
1633 * lock_session_list() and unlock_session_list().
1635 static void list_lttng_sessions(struct lttng_session
*sessions
)
1638 struct ltt_session
*session
;
1640 DBG("Getting all available session");
1642 * Iterate over session list and append data after the control struct in
1645 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1646 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
1647 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
1648 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
1649 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
1655 * Fill lttng_channel array of all channels.
1657 static void list_lttng_channels(struct ltt_session
*session
,
1658 struct lttng_channel
*channels
)
1661 struct ltt_kernel_channel
*kchan
;
1663 DBG("Listing channels for session %s", session
->name
);
1665 /* Kernel channels */
1666 if (session
->kernel_session
!= NULL
) {
1667 cds_list_for_each_entry(kchan
, &session
->kernel_session
->channel_list
.head
, list
) {
1668 /* Copy lttng_channel struct to array */
1669 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
1670 channels
[i
].enabled
= kchan
->enabled
;
1675 /* TODO: Missing UST listing */
1679 * Fill lttng_event array of all events in the channel.
1681 static void list_lttng_events(struct ltt_kernel_channel
*kchan
,
1682 struct lttng_event
*events
)
1685 * TODO: This is ONLY kernel. Need UST support.
1688 struct ltt_kernel_event
*event
;
1690 DBG("Listing events for channel %s", kchan
->channel
->name
);
1692 /* Kernel channels */
1693 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
1694 strncpy(events
[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
1695 events
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1696 events
[i
].enabled
= event
->enabled
;
1697 switch (event
->event
->instrumentation
) {
1698 case LTTNG_KERNEL_TRACEPOINT
:
1699 events
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1701 case LTTNG_KERNEL_KPROBE
:
1702 case LTTNG_KERNEL_KRETPROBE
:
1703 events
[i
].type
= LTTNG_EVENT_PROBE
;
1704 memcpy(&events
[i
].attr
.probe
, &event
->event
->u
.kprobe
,
1705 sizeof(struct lttng_kernel_kprobe
));
1707 case LTTNG_KERNEL_FUNCTION
:
1708 events
[i
].type
= LTTNG_EVENT_FUNCTION
;
1709 memcpy(&events
[i
].attr
.ftrace
, &event
->event
->u
.ftrace
,
1710 sizeof(struct lttng_kernel_function
));
1718 * Process the command requested by the lttng client within the command
1719 * context structure. This function make sure that the return structure (llm)
1720 * is set and ready for transmission before returning.
1722 * Return any error encountered or 0 for success.
1724 static int process_client_msg(struct command_ctx
*cmd_ctx
)
1726 int ret
= LTTCOMM_OK
;
1728 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
1731 * Commands that DO NOT need a session.
1733 switch (cmd_ctx
->lsm
->cmd_type
) {
1734 case LTTNG_CREATE_SESSION
:
1735 case LTTNG_LIST_SESSIONS
:
1736 case LTTNG_LIST_TRACEPOINTS
:
1737 case LTTNG_CALIBRATE
:
1740 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
1741 cmd_ctx
->session
= find_session_by_name(cmd_ctx
->lsm
->session
.name
);
1742 if (cmd_ctx
->session
== NULL
) {
1743 /* If session name not found */
1744 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
1745 ret
= LTTCOMM_SESS_NOT_FOUND
;
1746 } else { /* If no session name specified */
1747 ret
= LTTCOMM_SELECT_SESS
;
1751 /* Acquire lock for the session */
1752 lock_session(cmd_ctx
->session
);
1758 * Check domain type for specific "pre-action".
1760 switch (cmd_ctx
->lsm
->domain
.type
) {
1761 case LTTNG_DOMAIN_KERNEL
:
1762 /* Kernel tracer check */
1763 if (kernel_tracer_fd
== 0) {
1764 init_kernel_tracer();
1765 if (kernel_tracer_fd
== 0) {
1766 ret
= LTTCOMM_KERN_NA
;
1770 /* Need a session for kernel command */
1771 switch (cmd_ctx
->lsm
->cmd_type
) {
1772 case LTTNG_CALIBRATE
:
1773 case LTTNG_CREATE_SESSION
:
1774 case LTTNG_LIST_SESSIONS
:
1775 case LTTNG_LIST_TRACEPOINTS
:
1778 if (cmd_ctx
->session
->kernel_session
== NULL
) {
1779 ret
= create_kernel_session(cmd_ctx
->session
);
1781 ret
= LTTCOMM_KERN_SESS_FAIL
;
1784 /* Start the kernel consumer daemon */
1785 if (kconsumerd_pid
== 0 &&
1786 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
1787 ret
= start_kconsumerd();
1795 case LTTNG_DOMAIN_UST_PID
:
1801 /* Process by command type */
1802 switch (cmd_ctx
->lsm
->cmd_type
) {
1803 case LTTNG_ADD_CONTEXT
:
1805 struct lttng_kernel_context kctx
;
1807 /* Setup lttng message with no payload */
1808 ret
= setup_lttng_msg(cmd_ctx
, 0);
1813 switch (cmd_ctx
->lsm
->domain
.type
) {
1814 case LTTNG_DOMAIN_KERNEL
:
1815 /* Create Kernel context */
1816 kctx
.ctx
= cmd_ctx
->lsm
->u
.context
.ctx
.ctx
;
1817 kctx
.u
.perf_counter
.type
= cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.type
;
1818 kctx
.u
.perf_counter
.config
= cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.config
;
1819 strncpy(kctx
.u
.perf_counter
.name
,
1820 cmd_ctx
->lsm
->u
.context
.ctx
.u
.perf_counter
.name
,
1821 LTTNG_SYMBOL_NAME_LEN
);
1822 kctx
.u
.perf_counter
.name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1824 /* Add kernel context to kernel tracer. See context.c */
1825 ret
= add_kernel_context(cmd_ctx
->session
->kernel_session
, &kctx
,
1826 cmd_ctx
->lsm
->u
.context
.event_name
,
1827 cmd_ctx
->lsm
->u
.context
.channel_name
);
1828 if (ret
!= LTTCOMM_OK
) {
1833 /* TODO: Userspace tracing */
1834 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1841 case LTTNG_DISABLE_CHANNEL
:
1843 struct ltt_kernel_channel
*kchan
;
1845 /* Setup lttng message with no payload */
1846 ret
= setup_lttng_msg(cmd_ctx
, 0);
1851 switch (cmd_ctx
->lsm
->domain
.type
) {
1852 case LTTNG_DOMAIN_KERNEL
:
1853 kchan
= trace_kernel_get_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1854 cmd_ctx
->session
->kernel_session
);
1855 if (kchan
== NULL
) {
1856 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1858 } else if (kchan
->enabled
== 1) {
1859 ret
= kernel_disable_channel(kchan
);
1861 if (ret
!= EEXIST
) {
1862 ret
= LTTCOMM_KERN_CHAN_DISABLE_FAIL
;
1867 kernel_wait_quiescent(kernel_tracer_fd
);
1870 /* TODO: Userspace tracing */
1871 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1878 case LTTNG_DISABLE_EVENT
:
1880 struct ltt_kernel_channel
*kchan
;
1881 struct ltt_kernel_event
*kevent
;
1883 /* Setup lttng message with no payload */
1884 ret
= setup_lttng_msg(cmd_ctx
, 0);
1889 switch (cmd_ctx
->lsm
->domain
.type
) {
1890 case LTTNG_DOMAIN_KERNEL
:
1891 kchan
= trace_kernel_get_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1892 cmd_ctx
->session
->kernel_session
);
1893 if (kchan
== NULL
) {
1894 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1898 kevent
= trace_kernel_get_event_by_name(cmd_ctx
->lsm
->u
.disable
.name
, kchan
);
1899 if (kevent
!= NULL
) {
1900 DBG("Disabling kernel event %s for channel %s.", kevent
->event
->name
,
1901 kchan
->channel
->name
);
1902 ret
= kernel_disable_event(kevent
);
1904 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
1909 kernel_wait_quiescent(kernel_tracer_fd
);
1912 /* TODO: Userspace tracing */
1913 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1920 case LTTNG_DISABLE_ALL_EVENT
:
1922 struct ltt_kernel_channel
*kchan
;
1923 struct ltt_kernel_event
*kevent
;
1925 /* Setup lttng message with no payload */
1926 ret
= setup_lttng_msg(cmd_ctx
, 0);
1931 switch (cmd_ctx
->lsm
->domain
.type
) {
1932 case LTTNG_DOMAIN_KERNEL
:
1933 DBG("Disabling all enabled kernel events");
1934 kchan
= trace_kernel_get_channel_by_name(cmd_ctx
->lsm
->u
.disable
.channel_name
,
1935 cmd_ctx
->session
->kernel_session
);
1936 if (kchan
== NULL
) {
1937 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1941 /* For each event in the kernel session */
1942 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
1943 DBG("Disabling kernel event %s for channel %s.",
1944 kevent
->event
->name
, kchan
->channel
->name
);
1945 ret
= kernel_disable_event(kevent
);
1951 /* Quiescent wait after event disable */
1952 kernel_wait_quiescent(kernel_tracer_fd
);
1955 /* TODO: Userspace tracing */
1956 ret
= LTTCOMM_NOT_IMPLEMENTED
;
1963 case LTTNG_ENABLE_CHANNEL
:
1965 struct ltt_kernel_channel
*kchan
;
1967 /* Setup lttng message with no payload */
1968 ret
= setup_lttng_msg(cmd_ctx
, 0);
1973 switch (cmd_ctx
->lsm
->domain
.type
) {
1974 case LTTNG_DOMAIN_KERNEL
:
1975 kchan
= trace_kernel_get_channel_by_name(cmd_ctx
->lsm
->u
.enable
.channel_name
,
1976 cmd_ctx
->session
->kernel_session
);
1977 if (kchan
== NULL
) {
1978 /* Channel not found, creating it */
1979 DBG("Creating kernel channel");
1981 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
1982 &cmd_ctx
->lsm
->u
.channel
.chan
,
1983 cmd_ctx
->session
->kernel_session
->trace_path
);
1985 ret
= LTTCOMM_KERN_CHAN_FAIL
;
1989 /* Notify kernel thread that there is a new channel */
1990 ret
= notify_kernel_pollfd();
1992 ret
= LTTCOMM_FATAL
;
1995 } else if (kchan
->enabled
== 0) {
1996 ret
= kernel_enable_channel(kchan
);
1998 if (ret
!= EEXIST
) {
1999 ret
= LTTCOMM_KERN_CHAN_ENABLE_FAIL
;
2005 kernel_wait_quiescent(kernel_tracer_fd
);
2007 case LTTNG_DOMAIN_UST_PID
:
2011 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2018 case LTTNG_ENABLE_EVENT
:
2021 struct ltt_kernel_channel
*kchan
;
2022 struct ltt_kernel_event
*kevent
;
2023 struct lttng_channel
*chan
;
2025 /* Setup lttng message with no payload */
2026 ret
= setup_lttng_msg(cmd_ctx
, 0);
2031 channel_name
= cmd_ctx
->lsm
->u
.enable
.channel_name
;
2033 switch (cmd_ctx
->lsm
->domain
.type
) {
2034 case LTTNG_DOMAIN_KERNEL
:
2035 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2036 cmd_ctx
->session
->kernel_session
);
2037 if (kchan
== NULL
) {
2038 DBG("Channel not found. Creating channel %s", channel_name
);
2040 chan
= init_default_channel(cmd_ctx
->lsm
->domain
.type
, channel_name
);
2042 ret
= LTTCOMM_FATAL
;
2046 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
2047 chan
, cmd_ctx
->session
->kernel_session
->trace_path
);
2049 ret
= LTTCOMM_KERN_CHAN_FAIL
;
2052 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2053 cmd_ctx
->session
->kernel_session
);
2054 if (kchan
== NULL
) {
2055 ERR("Channel %s not found after creation. Internal error, giving up.",
2057 ret
= LTTCOMM_FATAL
;
2062 kevent
= trace_kernel_get_event_by_name(cmd_ctx
->lsm
->u
.enable
.event
.name
, kchan
);
2063 if (kevent
== NULL
) {
2064 DBG("Creating kernel event %s for channel %s.",
2065 cmd_ctx
->lsm
->u
.enable
.event
.name
, channel_name
);
2066 ret
= kernel_create_event(&cmd_ctx
->lsm
->u
.enable
.event
, kchan
);
2068 DBG("Enabling kernel event %s for channel %s.",
2069 kevent
->event
->name
, channel_name
);
2070 ret
= kernel_enable_event(kevent
);
2071 if (ret
== -EEXIST
) {
2072 ret
= LTTCOMM_KERN_EVENT_EXIST
;
2078 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2082 kernel_wait_quiescent(kernel_tracer_fd
);
2085 /* TODO: Userspace tracing */
2086 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2092 case LTTNG_ENABLE_ALL_EVENT
:
2096 struct ltt_kernel_channel
*kchan
;
2097 struct ltt_kernel_event
*kevent
;
2098 struct lttng_event
*event_list
;
2099 struct lttng_channel
*chan
;
2101 /* Setup lttng message with no payload */
2102 ret
= setup_lttng_msg(cmd_ctx
, 0);
2107 DBG("Enabling all kernel event");
2109 channel_name
= cmd_ctx
->lsm
->u
.enable
.channel_name
;
2111 switch (cmd_ctx
->lsm
->domain
.type
) {
2112 case LTTNG_DOMAIN_KERNEL
:
2113 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2114 cmd_ctx
->session
->kernel_session
);
2115 if (kchan
== NULL
) {
2116 DBG("Channel not found. Creating channel %s", channel_name
);
2118 chan
= init_default_channel(cmd_ctx
->lsm
->domain
.type
, channel_name
);
2120 ret
= LTTCOMM_FATAL
;
2124 ret
= kernel_create_channel(cmd_ctx
->session
->kernel_session
,
2125 chan
, cmd_ctx
->session
->kernel_session
->trace_path
);
2127 ret
= LTTCOMM_KERN_CHAN_FAIL
;
2130 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2131 cmd_ctx
->session
->kernel_session
);
2132 if (kchan
== NULL
) {
2133 ERR("Channel %s not found after creation. Internal error, giving up.",
2135 ret
= LTTCOMM_FATAL
;
2140 /* For each event in the kernel session */
2141 cds_list_for_each_entry(kevent
, &kchan
->events_list
.head
, list
) {
2142 DBG("Enabling kernel event %s for channel %s.",
2143 kevent
->event
->name
, channel_name
);
2144 ret
= kernel_enable_event(kevent
);
2150 size
= kernel_list_events(kernel_tracer_fd
, &event_list
);
2152 ret
= LTTCOMM_KERN_LIST_FAIL
;
2156 for (i
= 0; i
< size
; i
++) {
2157 kevent
= trace_kernel_get_event_by_name(event_list
[i
].name
, kchan
);
2158 if (kevent
== NULL
) {
2159 /* Default event type for enable all */
2160 event_list
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2161 /* Enable each single tracepoint event */
2162 ret
= kernel_create_event(&event_list
[i
], kchan
);
2164 /* Ignore error here and continue */
2171 /* Quiescent wait after event enable */
2172 kernel_wait_quiescent(kernel_tracer_fd
);
2175 /* TODO: Userspace tracing */
2176 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2183 case LTTNG_LIST_TRACEPOINTS
:
2185 struct lttng_event
*events
;
2186 ssize_t nb_events
= 0;
2188 switch (cmd_ctx
->lsm
->domain
.type
) {
2189 case LTTNG_DOMAIN_KERNEL
:
2190 DBG("Listing kernel events");
2191 nb_events
= kernel_list_events(kernel_tracer_fd
, &events
);
2192 if (nb_events
< 0) {
2193 ret
= LTTCOMM_KERN_LIST_FAIL
;
2198 /* TODO: Userspace listing */
2199 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2204 * Setup lttng message with payload size set to the event list size in
2205 * bytes and then copy list into the llm payload.
2207 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
2213 /* Copy event list into message payload */
2214 memcpy(cmd_ctx
->llm
->payload
, events
,
2215 sizeof(struct lttng_event
) * nb_events
);
2222 case LTTNG_START_TRACE
:
2224 struct ltt_kernel_channel
*chan
;
2226 /* Setup lttng message with no payload */
2227 ret
= setup_lttng_msg(cmd_ctx
, 0);
2232 /* Kernel tracing */
2233 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2234 if (cmd_ctx
->session
->kernel_session
->metadata
== NULL
) {
2235 DBG("Open kernel metadata");
2236 ret
= kernel_open_metadata(cmd_ctx
->session
->kernel_session
,
2237 cmd_ctx
->session
->kernel_session
->trace_path
);
2239 ret
= LTTCOMM_KERN_META_FAIL
;
2244 if (cmd_ctx
->session
->kernel_session
->metadata_stream_fd
== 0) {
2245 DBG("Opening kernel metadata stream");
2246 if (cmd_ctx
->session
->kernel_session
->metadata_stream_fd
== 0) {
2247 ret
= kernel_open_metadata_stream(cmd_ctx
->session
->kernel_session
);
2249 ERR("Kernel create metadata stream failed");
2250 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2256 /* For each channel */
2257 cds_list_for_each_entry(chan
,
2258 &cmd_ctx
->session
->kernel_session
->channel_list
.head
, list
) {
2259 if (chan
->stream_count
== 0) {
2260 ret
= kernel_open_channel_stream(chan
);
2262 ERR("Kernel create channel stream failed");
2263 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2266 /* Update the stream global counter */
2267 cmd_ctx
->session
->kernel_session
->stream_count_global
+= ret
;
2271 ret
= start_kernel_trace(cmd_ctx
->session
->kernel_session
);
2273 ret
= LTTCOMM_KERN_START_FAIL
;
2277 DBG("Start kernel tracing");
2278 ret
= kernel_start_session(cmd_ctx
->session
->kernel_session
);
2280 ERR("Kernel start session failed");
2281 ret
= LTTCOMM_KERN_START_FAIL
;
2285 /* Quiescent wait after starting trace */
2286 kernel_wait_quiescent(kernel_tracer_fd
);
2289 /* TODO: Start all UST traces */
2294 case LTTNG_STOP_TRACE
:
2296 struct ltt_kernel_channel
*chan
;
2297 /* Setup lttng message with no payload */
2298 ret
= setup_lttng_msg(cmd_ctx
, 0);
2304 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2305 DBG("Stop kernel tracing");
2307 ret
= kernel_metadata_flush_buffer(cmd_ctx
->session
->kernel_session
->metadata_stream_fd
);
2309 ERR("Kernel metadata flush failed");
2312 cds_list_for_each_entry(chan
, &cmd_ctx
->session
->kernel_session
->channel_list
.head
, list
) {
2313 ret
= kernel_flush_buffer(chan
);
2315 ERR("Kernel flush buffer error");
2319 ret
= kernel_stop_session(cmd_ctx
->session
->kernel_session
);
2321 ERR("Kernel stop session failed");
2322 ret
= LTTCOMM_KERN_STOP_FAIL
;
2326 /* Quiescent wait after stopping trace */
2327 kernel_wait_quiescent(kernel_tracer_fd
);
2330 /* TODO : User-space tracer */
2335 case LTTNG_CREATE_SESSION
:
2337 /* Setup lttng message with no payload */
2338 ret
= setup_lttng_msg(cmd_ctx
, 0);
2343 ret
= create_session(cmd_ctx
->lsm
->session
.name
, cmd_ctx
->lsm
->session
.path
);
2345 if (ret
== -EEXIST
) {
2346 ret
= LTTCOMM_EXIST_SESS
;
2348 ret
= LTTCOMM_FATAL
;
2356 case LTTNG_DESTROY_SESSION
:
2358 /* Setup lttng message with no payload */
2359 ret
= setup_lttng_msg(cmd_ctx
, 0);
2364 /* Clean kernel session teardown */
2365 teardown_kernel_session(cmd_ctx
->session
);
2367 ret
= destroy_session(cmd_ctx
->lsm
->session
.name
);
2369 ret
= LTTCOMM_FATAL
;
2374 * Must notify the kernel thread here to update it's pollfd in order to
2375 * remove the channel(s)' fd just destroyed.
2377 ret
= notify_kernel_pollfd();
2379 ret
= LTTCOMM_FATAL
;
2386 case LTTNG_LIST_DOMAINS
:
2390 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2394 nb_dom
+= cmd_ctx
->session
->ust_session_list
.count
;
2396 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_domain
) * nb_dom
);
2401 ((struct lttng_domain
*)(cmd_ctx
->llm
->payload
))[0].type
=
2402 LTTNG_DOMAIN_KERNEL
;
2404 /* TODO: User-space tracer domain support */
2408 case LTTNG_LIST_CHANNELS
:
2411 * TODO: Only kernel channels are listed here. UST listing
2412 * is needed on lttng-ust 2.0 release.
2415 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2416 nb_chan
+= cmd_ctx
->session
->kernel_session
->channel_count
;
2419 ret
= setup_lttng_msg(cmd_ctx
,
2420 sizeof(struct lttng_channel
) * nb_chan
);
2425 list_lttng_channels(cmd_ctx
->session
,
2426 (struct lttng_channel
*)(cmd_ctx
->llm
->payload
));
2431 case LTTNG_LIST_EVENTS
:
2434 * TODO: Only kernel events are listed here. UST listing
2435 * is needed on lttng-ust 2.0 release.
2437 size_t nb_event
= 0;
2438 struct ltt_kernel_channel
*kchan
= NULL
;
2440 if (cmd_ctx
->session
->kernel_session
!= NULL
) {
2441 kchan
= trace_kernel_get_channel_by_name(cmd_ctx
->lsm
->u
.list
.channel_name
,
2442 cmd_ctx
->session
->kernel_session
);
2443 if (kchan
== NULL
) {
2444 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2447 nb_event
+= kchan
->event_count
;
2450 ret
= setup_lttng_msg(cmd_ctx
,
2451 sizeof(struct lttng_event
) * nb_event
);
2456 DBG("Listing events (%zu events)", nb_event
);
2458 list_lttng_events(kchan
,
2459 (struct lttng_event
*)(cmd_ctx
->llm
->payload
));
2464 case LTTNG_LIST_SESSIONS
:
2466 lock_session_list();
2468 if (session_list_ptr
->count
== 0) {
2469 ret
= LTTCOMM_NO_SESSION
;
2470 unlock_session_list();
2474 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) *
2475 session_list_ptr
->count
);
2477 unlock_session_list();
2481 /* Filled the session array */
2482 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
));
2484 unlock_session_list();
2489 case LTTNG_CALIBRATE
:
2491 /* Setup lttng message with no payload */
2492 ret
= setup_lttng_msg(cmd_ctx
, 0);
2497 switch (cmd_ctx
->lsm
->domain
.type
) {
2498 case LTTNG_DOMAIN_KERNEL
:
2500 struct lttng_kernel_calibrate kcalibrate
;
2502 kcalibrate
.type
= cmd_ctx
->lsm
->u
.calibrate
.type
;
2503 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2505 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2511 /* TODO: Userspace tracing */
2512 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2518 case LTTNG_REGISTER_CONSUMER
:
2522 /* Setup lttng message with no payload */
2523 ret
= setup_lttng_msg(cmd_ctx
, 0);
2528 switch (cmd_ctx
->lsm
->domain
.type
) {
2529 case LTTNG_DOMAIN_KERNEL
:
2531 /* Can't register a consumer if there is already one */
2532 if (cmd_ctx
->session
->kernel_session
->consumer_fd
!= 0) {
2533 ret
= LTTCOMM_CONNECT_FAIL
;
2537 sock
= lttcomm_connect_unix_sock(cmd_ctx
->lsm
->u
.reg
.path
);
2539 ret
= LTTCOMM_CONNECT_FAIL
;
2543 cmd_ctx
->session
->kernel_session
->consumer_fd
= sock
;
2547 /* TODO: Userspace tracing */
2548 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2557 /* Undefined command */
2558 ret
= setup_lttng_msg(cmd_ctx
, 0);
2567 /* Set return code */
2568 cmd_ctx
->llm
->ret_code
= ret
;
2570 if (cmd_ctx
->session
) {
2571 unlock_session(cmd_ctx
->session
);
2577 if (cmd_ctx
->llm
== NULL
) {
2578 DBG("Missing llm structure. Allocating one.");
2579 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
2583 /* Notify client of error */
2584 cmd_ctx
->llm
->ret_code
= ret
;
2587 if (cmd_ctx
->session
) {
2588 unlock_session(cmd_ctx
->session
);
2594 * This thread manage all clients request using the unix client socket for
2597 static void *thread_manage_clients(void *data
)
2600 struct command_ctx
*cmd_ctx
= NULL
;
2601 struct pollfd pollfd
[2];
2603 DBG("[thread] Manage client started");
2605 ret
= lttcomm_listen_unix_sock(client_sock
);
2610 /* First fd is always the quit pipe */
2611 pollfd
[0].fd
= thread_quit_pipe
[0];
2614 pollfd
[1].fd
= client_sock
;
2615 pollfd
[1].events
= POLLIN
;
2617 /* Notify parent pid that we are ready
2618 * to accept command for client side.
2620 if (opt_sig_parent
) {
2621 kill(ppid
, SIGCHLD
);
2625 DBG("Accepting client command ...");
2627 /* Inifinite blocking call, waiting for transmission */
2628 ret
= poll(pollfd
, 2, -1);
2630 perror("poll client thread");
2634 /* Thread quit pipe has been closed. Killing thread. */
2635 if (pollfd
[0].revents
== POLLNVAL
) {
2637 } else if (pollfd
[1].revents
== POLLERR
) {
2638 ERR("Client socket poll error");
2642 sock
= lttcomm_accept_unix_sock(client_sock
);
2647 /* Allocate context command to process the client request */
2648 cmd_ctx
= malloc(sizeof(struct command_ctx
));
2650 /* Allocate data buffer for reception */
2651 cmd_ctx
->lsm
= malloc(sizeof(struct lttcomm_session_msg
));
2652 cmd_ctx
->llm
= NULL
;
2653 cmd_ctx
->session
= NULL
;
2656 * Data is received from the lttng client. The struct
2657 * lttcomm_session_msg (lsm) contains the command and data request of
2660 DBG("Receiving data from client ...");
2661 ret
= lttcomm_recv_unix_sock(sock
, cmd_ctx
->lsm
, sizeof(struct lttcomm_session_msg
));
2666 // TODO: Validate cmd_ctx including sanity check for security purpose.
2669 * This function dispatch the work to the kernel or userspace tracer
2670 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2671 * informations for the client. The command context struct contains
2672 * everything this function may needs.
2674 ret
= process_client_msg(cmd_ctx
);
2676 /* TODO: Inform client somehow of the fatal error. At this point,
2677 * ret < 0 means that a malloc failed (ENOMEM). */
2678 /* Error detected but still accept command */
2679 clean_command_ctx(&cmd_ctx
);
2683 DBG("Sending response (size: %d, retcode: %d)",
2684 cmd_ctx
->lttng_msg_size
, cmd_ctx
->llm
->ret_code
);
2685 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
2687 ERR("Failed to send data back to client");
2690 clean_command_ctx(&cmd_ctx
);
2692 /* End of transmission */
2697 DBG("Client thread dying");
2705 unlink(client_unix_sock_path
);
2707 clean_command_ctx(&cmd_ctx
);
2713 * usage function on stderr
2715 static void usage(void)
2717 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
2718 fprintf(stderr
, " -h, --help Display this usage.\n");
2719 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
2720 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
2721 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
2722 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
2723 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
2724 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
2725 fprintf(stderr
, " -V, --version Show version number.\n");
2726 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
2727 fprintf(stderr
, " -q, --quiet No output at all.\n");
2728 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
2729 fprintf(stderr
, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n");
2733 * daemon argument parsing
2735 static int parse_args(int argc
, char **argv
)
2739 static struct option long_options
[] = {
2740 { "client-sock", 1, 0, 'c' },
2741 { "apps-sock", 1, 0, 'a' },
2742 { "kconsumerd-cmd-sock", 1, 0, 0 },
2743 { "kconsumerd-err-sock", 1, 0, 0 },
2744 { "daemonize", 0, 0, 'd' },
2745 { "sig-parent", 0, 0, 'S' },
2746 { "help", 0, 0, 'h' },
2747 { "group", 1, 0, 'g' },
2748 { "version", 0, 0, 'V' },
2749 { "quiet", 0, 0, 'q' },
2750 { "verbose", 0, 0, 'v' },
2751 { "verbose-kconsumerd", 0, 0, 'Z' },
2756 int option_index
= 0;
2757 c
= getopt_long(argc
, argv
, "dhqvVS" "a:c:g:s:E:C:Z", long_options
, &option_index
);
2764 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
2766 fprintf(stderr
, " with arg %s\n", optarg
);
2770 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2773 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2779 opt_tracing_group
= strdup(optarg
);
2785 fprintf(stdout
, "%s\n", VERSION
);
2791 snprintf(kconsumerd_err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2794 snprintf(kconsumerd_cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
2800 /* Verbose level can increase using multiple -v */
2804 opt_verbose_kconsumerd
+= 1;
2807 /* Unknown option or other error.
2808 * Error is printed by getopt, just return */
2817 * Creates the two needed socket by the daemon.
2818 * apps_sock - The communication socket for all UST apps.
2819 * client_sock - The communication of the cli tool (lttng).
2821 static int init_daemon_socket(void)
2826 old_umask
= umask(0);
2828 /* Create client tool unix socket */
2829 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
2830 if (client_sock
< 0) {
2831 ERR("Create unix sock failed: %s", client_unix_sock_path
);
2836 /* File permission MUST be 660 */
2837 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
2839 ERR("Set file permissions failed: %s", client_unix_sock_path
);
2844 /* Create the application unix socket */
2845 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
2846 if (apps_sock
< 0) {
2847 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
2852 /* File permission MUST be 666 */
2853 ret
= chmod(apps_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
2855 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
2866 * Check if the global socket is available, and if a daemon is answering
2867 * at the other side. If yes, error is returned.
2869 static int check_existing_daemon(void)
2871 if (access(client_unix_sock_path
, F_OK
) < 0 &&
2872 access(apps_unix_sock_path
, F_OK
) < 0) {
2875 /* Is there anybody out there ? */
2876 if (lttng_session_daemon_alive()) {
2884 * Set the tracing group gid onto the client socket.
2886 * Race window between mkdir and chown is OK because we are going from more
2887 * permissive (root.root) to les permissive (root.tracing).
2889 static int set_permissions(void)
2894 gid
= allowed_group();
2897 WARN("No tracing group detected");
2900 ERR("Missing tracing group. Aborting execution.");
2906 /* Set lttng run dir */
2907 ret
= chown(LTTNG_RUNDIR
, 0, gid
);
2909 ERR("Unable to set group on " LTTNG_RUNDIR
);
2913 /* lttng client socket path */
2914 ret
= chown(client_unix_sock_path
, 0, gid
);
2916 ERR("Unable to set group on %s", client_unix_sock_path
);
2920 /* kconsumerd error socket path */
2921 ret
= chown(kconsumerd_err_unix_sock_path
, 0, gid
);
2923 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path
);
2927 DBG("All permissions are set");
2934 * Create the pipe used to wake up the kernel thread.
2936 static int create_kernel_poll_pipe(void)
2938 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
2942 * Create the application command pipe to wake thread_manage_apps.
2944 static int create_apps_cmd_pipe(void)
2946 return pipe2(apps_cmd_pipe
, O_CLOEXEC
);
2950 * Create the lttng run directory needed for all global sockets and pipe.
2952 static int create_lttng_rundir(void)
2956 ret
= mkdir(LTTNG_RUNDIR
, S_IRWXU
| S_IRWXG
);
2958 if (errno
!= EEXIST
) {
2959 ERR("Unable to create " LTTNG_RUNDIR
);
2971 * Setup sockets and directory needed by the kconsumerd communication with the
2974 static int set_kconsumerd_sockets(void)
2978 if (strlen(kconsumerd_err_unix_sock_path
) == 0) {
2979 snprintf(kconsumerd_err_unix_sock_path
, PATH_MAX
, KCONSUMERD_ERR_SOCK_PATH
);
2982 if (strlen(kconsumerd_cmd_unix_sock_path
) == 0) {
2983 snprintf(kconsumerd_cmd_unix_sock_path
, PATH_MAX
, KCONSUMERD_CMD_SOCK_PATH
);
2986 ret
= mkdir(KCONSUMERD_PATH
, S_IRWXU
| S_IRWXG
);
2988 if (errno
!= EEXIST
) {
2989 ERR("Failed to create " KCONSUMERD_PATH
);
2995 /* Create the kconsumerd error unix socket */
2996 kconsumerd_err_sock
= lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path
);
2997 if (kconsumerd_err_sock
< 0) {
2998 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path
);
3003 /* File permission MUST be 660 */
3004 ret
= chmod(kconsumerd_err_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3006 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path
);
3016 * Signal handler for the daemon
3018 * Simply stop all worker threads, leaving main() return gracefully
3019 * after joining all threads and calling cleanup().
3021 static void sighandler(int sig
)
3025 DBG("SIGPIPE catched");
3028 DBG("SIGINT catched");
3032 DBG("SIGTERM catched");
3041 * Setup signal handler for :
3042 * SIGINT, SIGTERM, SIGPIPE
3044 static int set_signal_handler(void)
3047 struct sigaction sa
;
3050 if ((ret
= sigemptyset(&sigset
)) < 0) {
3051 perror("sigemptyset");
3055 sa
.sa_handler
= sighandler
;
3056 sa
.sa_mask
= sigset
;
3058 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
3059 perror("sigaction");
3063 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
3064 perror("sigaction");
3068 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
3069 perror("sigaction");
3073 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
3079 * Set open files limit to unlimited. This daemon can open a large number of
3080 * file descriptors in order to consumer multiple kernel traces.
3082 static void set_ulimit(void)
3087 /* The kernel does not allowed an infinite limit for open files */
3088 lim
.rlim_cur
= 65535;
3089 lim
.rlim_max
= 65535;
3091 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
3093 perror("failed to set open files limit");
3100 int main(int argc
, char **argv
)
3104 const char *home_path
;
3106 /* Create thread quit pipe */
3107 if ((ret
= init_thread_quit_pipe()) < 0) {
3111 /* Parse arguments */
3113 if ((ret
= parse_args(argc
, argv
) < 0)) {
3126 /* Check if daemon is UID = 0 */
3127 is_root
= !getuid();
3130 ret
= create_lttng_rundir();
3135 if (strlen(apps_unix_sock_path
) == 0) {
3136 snprintf(apps_unix_sock_path
, PATH_MAX
,
3137 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
3140 if (strlen(client_unix_sock_path
) == 0) {
3141 snprintf(client_unix_sock_path
, PATH_MAX
,
3142 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
3145 /* Set global SHM for ust */
3146 if (strlen(wait_shm_path
) == 0) {
3147 snprintf(wait_shm_path
, PATH_MAX
,
3148 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
3151 home_path
= get_home_dir();
3152 if (home_path
== NULL
) {
3153 /* TODO: Add --socket PATH option */
3154 ERR("Can't get HOME directory for sockets creation.");
3159 if (strlen(apps_unix_sock_path
) == 0) {
3160 snprintf(apps_unix_sock_path
, PATH_MAX
,
3161 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
3164 /* Set the cli tool unix socket path */
3165 if (strlen(client_unix_sock_path
) == 0) {
3166 snprintf(client_unix_sock_path
, PATH_MAX
,
3167 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
3170 /* Set global SHM for ust */
3171 if (strlen(wait_shm_path
) == 0) {
3172 snprintf(wait_shm_path
, PATH_MAX
,
3173 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
3177 DBG("Client socket path %s", client_unix_sock_path
);
3178 DBG("Application socket path %s", apps_unix_sock_path
);
3181 * See if daemon already exist.
3183 if ((ret
= check_existing_daemon()) < 0) {
3184 ERR("Already running daemon.\n");
3186 * We do not goto exit because we must not cleanup()
3187 * because a daemon is already running.
3192 /* After this point, we can safely call cleanup() so goto error is used */
3195 * These actions must be executed as root. We do that *after* setting up
3196 * the sockets path because we MUST make the check for another daemon using
3197 * those paths *before* trying to set the kernel consumer sockets and init
3201 ret
= set_kconsumerd_sockets();
3206 /* Setup kernel tracer */
3207 init_kernel_tracer();
3209 /* Set ulimit for open files */
3213 if ((ret
= set_signal_handler()) < 0) {
3217 /* Setup the needed unix socket */
3218 if ((ret
= init_daemon_socket()) < 0) {
3222 /* Set credentials to socket */
3223 if (is_root
&& ((ret
= set_permissions()) < 0)) {
3227 /* Get parent pid if -S, --sig-parent is specified. */
3228 if (opt_sig_parent
) {
3232 /* Setup the kernel pipe for waking up the kernel thread */
3233 if ((ret
= create_kernel_poll_pipe()) < 0) {
3237 /* Setup the thread apps communication pipe. */
3238 if ((ret
= create_apps_cmd_pipe()) < 0) {
3242 /* Init UST command queue. */
3243 cds_wfq_init(&ust_cmd_queue
.queue
);
3246 * Get session list pointer. This pointer MUST NOT be free().
3247 * This list is statically declared in session.c
3249 session_list_ptr
= get_session_list();
3251 /* Create thread to manage the client socket */
3252 ret
= pthread_create(&client_thread
, NULL
,
3253 thread_manage_clients
, (void *) NULL
);
3255 perror("pthread_create clients");
3259 /* Create thread to dispatch registration */
3260 ret
= pthread_create(&dispatch_thread
, NULL
,
3261 thread_dispatch_ust_registration
, (void *) NULL
);
3263 perror("pthread_create dispatch");
3267 /* Create thread to manage application registration. */
3268 ret
= pthread_create(®_apps_thread
, NULL
,
3269 thread_registration_apps
, (void *) NULL
);
3271 perror("pthread_create registration");
3275 /* Create thread to manage application socket */
3276 ret
= pthread_create(&apps_thread
, NULL
, thread_manage_apps
, (void *) NULL
);
3278 perror("pthread_create apps");
3282 /* Create kernel thread to manage kernel event */
3283 ret
= pthread_create(&kernel_thread
, NULL
, thread_manage_kernel
, (void *) NULL
);
3285 perror("pthread_create kernel");
3289 ret
= pthread_join(kernel_thread
, &status
);
3291 perror("pthread_join");
3292 goto error
; /* join error, exit without cleanup */
3296 ret
= pthread_join(apps_thread
, &status
);
3298 perror("pthread_join");
3299 goto error
; /* join error, exit without cleanup */
3303 ret
= pthread_join(reg_apps_thread
, &status
);
3305 perror("pthread_join");
3306 goto error
; /* join error, exit without cleanup */
3310 ret
= pthread_join(dispatch_thread
, &status
);
3312 perror("pthread_join");
3313 goto error
; /* join error, exit without cleanup */
3317 ret
= pthread_join(client_thread
, &status
);
3319 perror("pthread_join");
3320 goto error
; /* join error, exit without cleanup */
3323 ret
= join_kconsumerd_thread();
3325 perror("join_kconsumerd");
3326 goto error
; /* join error, exit without cleanup */
3332 * cleanup() is called when no other thread is running.