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 modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
25 #include <semaphore.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
35 #include <sys/types.h>
37 #include <urcu/futex.h>
41 #include <lttng-consumerd.h>
42 #include <lttng-sessiond-comm.h>
43 #include <lttng/lttng-consumer.h>
48 #include "compat/poll.h"
52 #include "hashtable.h"
53 #include "kernel-ctl.h"
54 #include "lttng-sessiond.h"
60 struct consumer_data
{
61 enum lttng_consumer_type type
;
63 pthread_t thread
; /* Worker thread interacting with the consumer */
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex
;
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path
[PATH_MAX
];
75 char cmd_unix_sock_path
[PATH_MAX
];
79 const char default_home_dir
[] = DEFAULT_HOME_DIR
;
80 const char default_tracing_group
[] = LTTNG_DEFAULT_TRACING_GROUP
;
81 const char default_ust_sock_dir
[] = DEFAULT_UST_SOCK_DIR
;
82 const char default_global_apps_pipe
[] = DEFAULT_GLOBAL_APPS_PIPE
;
85 int opt_verbose
; /* Not static for lttngerr.h */
86 int opt_verbose_consumer
; /* Not static for lttngerr.h */
87 int opt_quiet
; /* Not static for lttngerr.h */
90 const char *opt_tracing_group
;
91 static int opt_sig_parent
;
92 static int opt_daemon
;
93 static int is_root
; /* Set to 1 if the daemon is running as root */
94 static pid_t ppid
; /* Parent PID for --sig-parent option */
96 /* Consumer daemon specific control data */
97 static struct consumer_data kconsumer_data
= {
98 .type
= LTTNG_CONSUMER_KERNEL
,
100 static struct consumer_data ustconsumer_data
= {
101 .type
= LTTNG_CONSUMER_UST
,
104 static int dispatch_thread_exit
;
106 /* Global application Unix socket path */
107 static char apps_unix_sock_path
[PATH_MAX
];
108 /* Global client Unix socket path */
109 static char client_unix_sock_path
[PATH_MAX
];
110 /* global wait shm path for UST */
111 static char wait_shm_path
[PATH_MAX
];
113 /* Sockets and FDs */
114 static int client_sock
;
115 static int apps_sock
;
116 static int kernel_tracer_fd
;
117 static int kernel_poll_pipe
[2];
120 * Quit pipe for all threads. This permits a single cancellation point
121 * for all threads when receiving an event on the pipe.
123 static int thread_quit_pipe
[2];
126 * This pipe is used to inform the thread managing application communication
127 * that a command is queued and ready to be processed.
129 static int apps_cmd_pipe
[2];
131 /* Pthread, Mutexes and Semaphores */
132 static pthread_t apps_thread
;
133 static pthread_t reg_apps_thread
;
134 static pthread_t client_thread
;
135 static pthread_t kernel_thread
;
136 static pthread_t dispatch_thread
;
140 * UST registration command queue. This queue is tied with a futex and uses a N
141 * wakers / 1 waiter implemented and detailed in futex.c/.h
143 * The thread_manage_apps and thread_dispatch_ust_registration interact with
144 * this queue and the wait/wake scheme.
146 static struct ust_cmd_queue ust_cmd_queue
;
149 * Pointer initialized before thread creation.
151 * This points to the tracing session list containing the session count and a
152 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
153 * MUST NOT be taken if you call a public function in session.c.
155 * The lock is nested inside the structure: session_list_ptr->lock. Please use
156 * session_lock_list and session_unlock_list for lock acquisition.
158 static struct ltt_session_list
*session_list_ptr
;
162 static const char *compat32_consumer_bindir
=
163 __stringify(CONFIG_COMPAT_BIN_DIR
);
164 static const char *compat32_consumer_prog
= "lttng-consumerd";
167 void setup_compat32_consumer(void)
172 * runtime env. var. overrides the build default.
174 bindir
= getenv("LTTNG_TOOLS_COMPAT_BIN_DIR");
176 compat32_consumer_bindir
= bindir
;
181 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
183 static int create_thread_poll_set(struct lttng_poll_event
*events
,
188 if (events
== NULL
|| size
== 0) {
193 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
199 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
211 * Check if the thread quit pipe was triggered.
213 * Return 1 if it was triggered else 0;
215 static int check_thread_quit_pipe(int fd
, uint32_t events
)
217 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
225 * Remove modules in reverse load order.
227 static int modprobe_remove_kernel_modules(void)
232 for (i
= ARRAY_SIZE(kernel_modules_list
) - 1; i
>= 0; i
--) {
233 ret
= snprintf(modprobe
, sizeof(modprobe
),
234 "/sbin/modprobe -r -q %s",
235 kernel_modules_list
[i
].name
);
237 perror("snprintf modprobe -r");
240 modprobe
[sizeof(modprobe
) - 1] = '\0';
241 ret
= system(modprobe
);
243 ERR("Unable to launch modprobe -r for module %s",
244 kernel_modules_list
[i
].name
);
245 } else if (kernel_modules_list
[i
].required
246 && WEXITSTATUS(ret
) != 0) {
247 ERR("Unable to remove module %s",
248 kernel_modules_list
[i
].name
);
250 DBG("Modprobe removal successful %s",
251 kernel_modules_list
[i
].name
);
260 * Return group ID of the tracing group or -1 if not found.
262 static gid_t
allowed_group(void)
266 if (opt_tracing_group
) {
267 grp
= getgrnam(opt_tracing_group
);
269 grp
= getgrnam(default_tracing_group
);
279 * Init thread quit pipe.
281 * Return -1 on error or 0 if all pipes are created.
283 static int init_thread_quit_pipe(void)
287 ret
= pipe2(thread_quit_pipe
, O_CLOEXEC
);
289 perror("thread quit pipe");
298 * Complete teardown of a kernel session. This free all data structure related
299 * to a kernel session and update counter.
301 static void teardown_kernel_session(struct ltt_session
*session
)
303 if (session
->kernel_session
!= NULL
) {
304 DBG("Tearing down kernel session");
307 * If a custom kernel consumer was registered, close the socket before
308 * tearing down the complete kernel session structure
310 if (session
->kernel_session
->consumer_fd
!= kconsumer_data
.cmd_sock
) {
311 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
314 trace_kernel_destroy_session(session
->kernel_session
);
315 /* Extra precaution */
316 session
->kernel_session
= NULL
;
321 * Complete teardown of all UST sessions. This will free everything on his path
322 * and destroy the core essence of all ust sessions :)
324 static void teardown_ust_session(struct ltt_session
*session
)
328 DBG("Tearing down UST session(s)");
330 ret
= ust_app_destroy_trace_all(session
->ust_session
);
332 ERR("Error in ust_app_destroy_trace_all");
334 trace_ust_destroy_session(session
->ust_session
);
338 * Stop all threads by closing the thread quit pipe.
340 static void stop_threads(void)
344 /* Stopping all threads */
345 DBG("Terminating all threads");
346 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
348 ERR("write error on thread quit pipe");
351 /* Dispatch thread */
352 dispatch_thread_exit
= 1;
353 futex_nto1_wake(&ust_cmd_queue
.futex
);
359 static void cleanup(void)
363 struct ltt_session
*sess
, *stmp
;
368 DBG("Removing %s directory", LTTNG_RUNDIR
);
369 ret
= asprintf(&cmd
, "rm -rf " LTTNG_RUNDIR
);
371 ERR("asprintf failed. Something is really wrong!");
374 /* Remove lttng run directory */
377 ERR("Unable to clean " LTTNG_RUNDIR
);
381 DBG("Cleaning up all session");
383 /* Destroy session list mutex */
384 if (session_list_ptr
!= NULL
) {
385 pthread_mutex_destroy(&session_list_ptr
->lock
);
387 /* Cleanup ALL session */
388 cds_list_for_each_entry_safe(sess
, stmp
,
389 &session_list_ptr
->head
, list
) {
390 teardown_kernel_session(sess
);
391 teardown_ust_session(sess
);
396 DBG("Closing all UST sockets");
397 ust_app_clean_list();
399 pthread_mutex_destroy(&kconsumer_data
.pid_mutex
);
401 DBG("Closing kernel fd");
402 close(kernel_tracer_fd
);
405 DBG("Unloading kernel modules");
406 modprobe_remove_kernel_modules();
409 close(thread_quit_pipe
[0]);
410 close(thread_quit_pipe
[1]);
413 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
414 "Matthew, BEET driven development works!%c[%dm",
415 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
420 * Send data on a unix socket using the liblttsessiondcomm API.
422 * Return lttcomm error code.
424 static int send_unix_sock(int sock
, void *buf
, size_t len
)
426 /* Check valid length */
431 return lttcomm_send_unix_sock(sock
, buf
, len
);
435 * Free memory of a command context structure.
437 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
439 DBG("Clean command context structure");
441 if ((*cmd_ctx
)->llm
) {
442 free((*cmd_ctx
)->llm
);
444 if ((*cmd_ctx
)->lsm
) {
445 free((*cmd_ctx
)->lsm
);
453 * Send all stream fds of kernel channel to the consumer.
455 static int send_kconsumer_channel_streams(struct consumer_data
*consumer_data
,
456 int sock
, struct ltt_kernel_channel
*channel
)
459 struct ltt_kernel_stream
*stream
;
460 struct lttcomm_consumer_msg lkm
;
462 DBG("Sending streams of channel %s to kernel consumer",
463 channel
->channel
->name
);
466 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
467 lkm
.u
.channel
.channel_key
= channel
->fd
;
468 lkm
.u
.channel
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
469 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
470 DBG("Sending channel %d to consumer", lkm
.u
.channel
.channel_key
);
471 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
473 perror("send consumer channel");
478 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
482 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
483 lkm
.u
.stream
.channel_key
= channel
->fd
;
484 lkm
.u
.stream
.stream_key
= stream
->fd
;
485 lkm
.u
.stream
.state
= stream
->state
;
486 lkm
.u
.stream
.output
= channel
->channel
->attr
.output
;
487 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
488 strncpy(lkm
.u
.stream
.path_name
, stream
->pathname
, PATH_MAX
- 1);
489 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
490 DBG("Sending stream %d to consumer", lkm
.u
.stream
.stream_key
);
491 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
493 perror("send consumer stream");
496 ret
= lttcomm_send_fds_unix_sock(sock
, &stream
->fd
, 1);
498 perror("send consumer stream ancillary data");
503 DBG("consumer channel streams sent");
512 * Send all stream fds of the kernel session to the consumer.
514 static int send_kconsumer_session_streams(struct consumer_data
*consumer_data
,
515 struct ltt_kernel_session
*session
)
518 struct ltt_kernel_channel
*chan
;
519 struct lttcomm_consumer_msg lkm
;
520 int sock
= session
->consumer_fd
;
522 DBG("Sending metadata stream fd");
524 /* Extra protection. It's NOT supposed to be set to 0 at this point */
525 if (session
->consumer_fd
== 0) {
526 session
->consumer_fd
= consumer_data
->cmd_sock
;
529 if (session
->metadata_stream_fd
!= 0) {
530 /* Send metadata channel fd */
531 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
532 lkm
.u
.channel
.channel_key
= session
->metadata
->fd
;
533 lkm
.u
.channel
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
534 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
535 DBG("Sending metadata channel %d to consumer", lkm
.u
.stream
.stream_key
);
536 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
538 perror("send consumer channel");
542 /* Send metadata stream fd */
543 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
544 lkm
.u
.stream
.channel_key
= session
->metadata
->fd
;
545 lkm
.u
.stream
.stream_key
= session
->metadata_stream_fd
;
546 lkm
.u
.stream
.state
= LTTNG_CONSUMER_ACTIVE_STREAM
;
547 lkm
.u
.stream
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
548 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
549 strncpy(lkm
.u
.stream
.path_name
, session
->metadata
->pathname
, PATH_MAX
- 1);
550 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
551 DBG("Sending metadata stream %d to consumer", lkm
.u
.stream
.stream_key
);
552 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
554 perror("send consumer stream");
557 ret
= lttcomm_send_fds_unix_sock(sock
, &session
->metadata_stream_fd
, 1);
559 perror("send consumer stream");
564 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
565 ret
= send_kconsumer_channel_streams(consumer_data
, sock
, chan
);
571 DBG("consumer fds (metadata and channel streams) sent");
580 * Notify UST applications using the shm mmap futex.
582 static int notify_ust_apps(int active
)
586 DBG("Notifying applications of session daemon state: %d", active
);
588 /* See shm.c for this call implying mmap, shm and futex calls */
589 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
590 if (wait_shm_mmap
== NULL
) {
594 /* Wake waiting process */
595 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
597 /* Apps notified successfully */
605 * Setup the outgoing data buffer for the response (llm) by allocating the
606 * right amount of memory and copying the original information from the lsm
609 * Return total size of the buffer pointed by buf.
611 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
617 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
618 if (cmd_ctx
->llm
== NULL
) {
624 /* Copy common data */
625 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
626 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
628 cmd_ctx
->llm
->data_size
= size
;
629 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
638 * Update the kernel poll set of all channel fd available over all tracing
639 * session. Add the wakeup pipe at the end of the set.
641 static int update_kernel_poll(struct lttng_poll_event
*events
)
644 struct ltt_session
*session
;
645 struct ltt_kernel_channel
*channel
;
647 DBG("Updating kernel poll set");
650 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
651 session_lock(session
);
652 if (session
->kernel_session
== NULL
) {
653 session_unlock(session
);
657 cds_list_for_each_entry(channel
,
658 &session
->kernel_session
->channel_list
.head
, list
) {
659 /* Add channel fd to the kernel poll set */
660 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
662 session_unlock(session
);
665 DBG("Channel fd %d added to kernel set", channel
->fd
);
667 session_unlock(session
);
669 session_unlock_list();
674 session_unlock_list();
679 * Find the channel fd from 'fd' over all tracing session. When found, check
680 * for new channel stream and send those stream fds to the kernel consumer.
682 * Useful for CPU hotplug feature.
684 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
687 struct ltt_session
*session
;
688 struct ltt_kernel_channel
*channel
;
690 DBG("Updating kernel streams for channel fd %d", fd
);
693 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
694 session_lock(session
);
695 if (session
->kernel_session
== NULL
) {
696 session_unlock(session
);
700 /* This is not suppose to be 0 but this is an extra security check */
701 if (session
->kernel_session
->consumer_fd
== 0) {
702 session
->kernel_session
->consumer_fd
= consumer_data
->cmd_sock
;
705 cds_list_for_each_entry(channel
,
706 &session
->kernel_session
->channel_list
.head
, list
) {
707 if (channel
->fd
== fd
) {
708 DBG("Channel found, updating kernel streams");
709 ret
= kernel_open_channel_stream(channel
);
715 * Have we already sent fds to the consumer? If yes, it means
716 * that tracing is started so it is safe to send our updated
719 if (session
->kernel_session
->consumer_fds_sent
== 1) {
720 ret
= send_kconsumer_channel_streams(consumer_data
,
721 session
->kernel_session
->consumer_fd
, channel
);
729 session_unlock(session
);
731 session_unlock_list();
735 session_unlock(session
);
736 session_unlock_list();
741 * For each tracing session, update newly registered apps.
743 static void update_ust_app(int app_sock
)
745 struct ltt_session
*sess
, *stmp
;
747 /* For all tracing session(s) */
748 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
749 if (sess
->ust_session
) {
750 ust_app_global_update(sess
->ust_session
, app_sock
);
756 * This thread manage event coming from the kernel.
758 * Features supported in this thread:
761 static void *thread_manage_kernel(void *data
)
763 int ret
, i
, pollfd
, update_poll_flag
= 1;
764 uint32_t revents
, nb_fd
;
766 struct lttng_poll_event events
;
768 DBG("Thread manage kernel started");
770 ret
= create_thread_poll_set(&events
, 2);
775 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
781 if (update_poll_flag
== 1) {
783 * Reset number of fd in the poll set. Always 2 since there is the thread
784 * quit pipe and the kernel pipe.
788 ret
= update_kernel_poll(&events
);
792 update_poll_flag
= 0;
795 nb_fd
= LTTNG_POLL_GETNB(&events
);
797 DBG("Thread kernel polling on %d fds", nb_fd
);
799 /* Zeroed the poll events */
800 lttng_poll_reset(&events
);
802 /* Poll infinite value of time */
803 ret
= lttng_poll_wait(&events
, -1);
806 } else if (ret
== 0) {
807 /* Should not happen since timeout is infinite */
808 ERR("Return value of poll is 0 with an infinite timeout.\n"
809 "This should not have happened! Continuing...");
813 for (i
= 0; i
< nb_fd
; i
++) {
814 /* Fetch once the poll data */
815 revents
= LTTNG_POLL_GETEV(&events
, i
);
816 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
818 /* Thread quit pipe has been closed. Killing thread. */
819 ret
= check_thread_quit_pipe(pollfd
, revents
);
824 /* Check for data on kernel pipe */
825 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
826 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
827 update_poll_flag
= 1;
831 * New CPU detected by the kernel. Adding kernel stream to
832 * kernel session and updating the kernel consumer
834 if (revents
& LPOLLIN
) {
835 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
841 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
842 * and unregister kernel stream at this point.
850 DBG("Kernel thread dying");
851 close(kernel_poll_pipe
[0]);
852 close(kernel_poll_pipe
[1]);
854 lttng_poll_clean(&events
);
860 * This thread manage the consumer error sent back to the session daemon.
862 static void *thread_manage_consumer(void *data
)
864 int sock
= 0, i
, ret
, pollfd
;
865 uint32_t revents
, nb_fd
;
866 enum lttcomm_return_code code
;
867 struct lttng_poll_event events
;
868 struct consumer_data
*consumer_data
= data
;
870 DBG("[thread] Manage consumer started");
872 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
878 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
879 * Nothing more will be added to this poll set.
881 ret
= create_thread_poll_set(&events
, 2);
886 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
891 nb_fd
= LTTNG_POLL_GETNB(&events
);
893 /* Inifinite blocking call, waiting for transmission */
894 ret
= lttng_poll_wait(&events
, -1);
899 for (i
= 0; i
< nb_fd
; i
++) {
900 /* Fetch once the poll data */
901 revents
= LTTNG_POLL_GETEV(&events
, i
);
902 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
904 /* Thread quit pipe has been closed. Killing thread. */
905 ret
= check_thread_quit_pipe(pollfd
, revents
);
910 /* Event on the registration socket */
911 if (pollfd
== consumer_data
->err_sock
) {
912 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
913 ERR("consumer err socket poll error");
919 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
924 DBG2("Receiving code from consumer err_sock");
926 /* Getting status code from kconsumerd */
927 ret
= lttcomm_recv_unix_sock(sock
, &code
,
928 sizeof(enum lttcomm_return_code
));
933 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
934 consumer_data
->cmd_sock
=
935 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
936 if (consumer_data
->cmd_sock
< 0) {
937 sem_post(&consumer_data
->sem
);
938 PERROR("consumer connect");
941 /* Signal condition to tell that the kconsumerd is ready */
942 sem_post(&consumer_data
->sem
);
943 DBG("consumer command socket ready");
945 ERR("consumer error when waiting for SOCK_READY : %s",
946 lttcomm_get_readable_code(-code
));
950 /* Remove the kconsumerd error sock since we've established a connexion */
951 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
956 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
961 /* Update number of fd */
962 nb_fd
= LTTNG_POLL_GETNB(&events
);
964 /* Inifinite blocking call, waiting for transmission */
965 ret
= lttng_poll_wait(&events
, -1);
970 for (i
= 0; i
< nb_fd
; i
++) {
971 /* Fetch once the poll data */
972 revents
= LTTNG_POLL_GETEV(&events
, i
);
973 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
975 /* Thread quit pipe has been closed. Killing thread. */
976 ret
= check_thread_quit_pipe(pollfd
, revents
);
981 /* Event on the kconsumerd socket */
982 if (pollfd
== sock
) {
983 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
984 ERR("consumer err socket second poll error");
990 /* Wait for any kconsumerd error */
991 ret
= lttcomm_recv_unix_sock(sock
, &code
,
992 sizeof(enum lttcomm_return_code
));
994 ERR("consumer closed the command socket");
998 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
1001 DBG("consumer thread dying");
1002 close(consumer_data
->err_sock
);
1003 close(consumer_data
->cmd_sock
);
1006 unlink(consumer_data
->err_unix_sock_path
);
1007 unlink(consumer_data
->cmd_unix_sock_path
);
1008 consumer_data
->pid
= 0;
1010 lttng_poll_clean(&events
);
1016 * This thread manage application communication.
1018 static void *thread_manage_apps(void *data
)
1021 uint32_t revents
, nb_fd
;
1022 struct ust_command ust_cmd
;
1023 struct lttng_poll_event events
;
1025 DBG("[thread] Manage application started");
1027 rcu_register_thread();
1028 rcu_thread_online();
1030 ret
= create_thread_poll_set(&events
, 2);
1035 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1041 /* Zeroed the events structure */
1042 lttng_poll_reset(&events
);
1044 nb_fd
= LTTNG_POLL_GETNB(&events
);
1046 DBG("Apps thread polling on %d fds", nb_fd
);
1048 /* Inifinite blocking call, waiting for transmission */
1049 ret
= lttng_poll_wait(&events
, -1);
1054 for (i
= 0; i
< nb_fd
; i
++) {
1055 /* Fetch once the poll data */
1056 revents
= LTTNG_POLL_GETEV(&events
, i
);
1057 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1059 /* Thread quit pipe has been closed. Killing thread. */
1060 ret
= check_thread_quit_pipe(pollfd
, revents
);
1065 /* Inspect the apps cmd pipe */
1066 if (pollfd
== apps_cmd_pipe
[0]) {
1067 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1068 ERR("Apps command pipe error");
1070 } else if (revents
& LPOLLIN
) {
1072 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1073 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1074 perror("read apps cmd pipe");
1078 /* Register applicaton to the session daemon */
1079 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1081 if (ret
== -ENOMEM
) {
1083 } else if (ret
< 0) {
1088 * Add channel(s) and event(s) to newly registered apps
1089 * from lttng global UST domain.
1091 update_ust_app(ust_cmd
.sock
);
1093 ret
= ustctl_register_done(ust_cmd
.sock
);
1096 * If the registration is not possible, we simply
1097 * unregister the apps and continue
1099 ust_app_unregister(ust_cmd
.sock
);
1102 * We just need here to monitor the close of the UST
1103 * socket and poll set monitor those by default.
1105 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, 0);
1110 DBG("Apps with sock %d added to poll set",
1118 * At this point, we know that a registered application made
1119 * the event at poll_wait.
1121 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1122 /* Removing from the poll set */
1123 ret
= lttng_poll_del(&events
, pollfd
);
1128 /* Socket closed on remote end. */
1129 ust_app_unregister(pollfd
);
1137 DBG("Application communication apps dying");
1138 close(apps_cmd_pipe
[0]);
1139 close(apps_cmd_pipe
[1]);
1141 lttng_poll_clean(&events
);
1143 rcu_thread_offline();
1144 rcu_unregister_thread();
1149 * Dispatch request from the registration threads to the application
1150 * communication thread.
1152 static void *thread_dispatch_ust_registration(void *data
)
1155 struct cds_wfq_node
*node
;
1156 struct ust_command
*ust_cmd
= NULL
;
1158 DBG("[thread] Dispatch UST command started");
1160 while (!dispatch_thread_exit
) {
1161 /* Atomically prepare the queue futex */
1162 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1165 /* Dequeue command for registration */
1166 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1168 DBG("Woken up but nothing in the UST command queue");
1169 /* Continue thread execution */
1173 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1175 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1176 " gid:%d sock:%d name:%s (version %d.%d)",
1177 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1178 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1179 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1180 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1182 * Inform apps thread of the new application registration. This
1183 * call is blocking so we can be assured that the data will be read
1184 * at some point in time or wait to the end of the world :)
1186 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1187 sizeof(struct ust_command
));
1189 perror("write apps cmd pipe");
1190 if (errno
== EBADF
) {
1192 * We can't inform the application thread to process
1193 * registration. We will exit or else application
1194 * registration will not occur and tracing will never
1201 } while (node
!= NULL
);
1203 /* Futex wait on queue. Blocking call on futex() */
1204 futex_nto1_wait(&ust_cmd_queue
.futex
);
1208 DBG("Dispatch thread dying");
1213 * This thread manage application registration.
1215 static void *thread_registration_apps(void *data
)
1217 int sock
= 0, i
, ret
, pollfd
;
1218 uint32_t revents
, nb_fd
;
1219 struct lttng_poll_event events
;
1221 * Get allocated in this thread, enqueued to a global queue, dequeued and
1222 * freed in the manage apps thread.
1224 struct ust_command
*ust_cmd
= NULL
;
1226 DBG("[thread] Manage application registration started");
1228 ret
= lttcomm_listen_unix_sock(apps_sock
);
1234 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1235 * more will be added to this poll set.
1237 ret
= create_thread_poll_set(&events
, 2);
1242 /* Add the application registration socket */
1243 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1248 /* Notify all applications to register */
1249 ret
= notify_ust_apps(1);
1251 ERR("Failed to notify applications or create the wait shared memory.\n"
1252 "Execution continues but there might be problem for already\n"
1253 "running applications that wishes to register.");
1257 DBG("Accepting application registration");
1259 nb_fd
= LTTNG_POLL_GETNB(&events
);
1261 /* Inifinite blocking call, waiting for transmission */
1262 ret
= lttng_poll_wait(&events
, -1);
1267 for (i
= 0; i
< nb_fd
; i
++) {
1268 /* Fetch once the poll data */
1269 revents
= LTTNG_POLL_GETEV(&events
, i
);
1270 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1272 /* Thread quit pipe has been closed. Killing thread. */
1273 ret
= check_thread_quit_pipe(pollfd
, revents
);
1278 /* Event on the registration socket */
1279 if (pollfd
== apps_sock
) {
1280 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1281 ERR("Register apps socket poll error");
1283 } else if (revents
& LPOLLIN
) {
1284 sock
= lttcomm_accept_unix_sock(apps_sock
);
1289 /* Create UST registration command for enqueuing */
1290 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1291 if (ust_cmd
== NULL
) {
1292 perror("ust command zmalloc");
1297 * Using message-based transmissions to ensure we don't
1298 * have to deal with partially received messages.
1300 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1301 sizeof(struct ust_register_msg
));
1302 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1304 perror("lttcomm_recv_unix_sock register apps");
1306 ERR("Wrong size received on apps register");
1313 ust_cmd
->sock
= sock
;
1315 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1316 " gid:%d sock:%d name:%s (version %d.%d)",
1317 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1318 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1319 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1320 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1323 * Lock free enqueue the registration request. The red pill
1324 * has been taken! This apps will be part of the *system*.
1326 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1329 * Wake the registration queue futex. Implicit memory
1330 * barrier with the exchange in cds_wfq_enqueue.
1332 futex_nto1_wake(&ust_cmd_queue
.futex
);
1339 DBG("UST Registration thread dying");
1341 /* Notify that the registration thread is gone */
1346 unlink(apps_unix_sock_path
);
1348 lttng_poll_clean(&events
);
1354 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1355 * exec or it will fails.
1357 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1360 struct timespec timeout
;
1362 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1363 timeout
.tv_nsec
= 0;
1365 /* Setup semaphore */
1366 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1368 PERROR("sem_init consumer semaphore");
1372 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1373 thread_manage_consumer
, consumer_data
);
1375 PERROR("pthread_create consumer");
1380 /* Get time for sem_timedwait absolute timeout */
1381 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1383 PERROR("clock_gettime spawn consumer");
1384 /* Infinite wait for the kconsumerd thread to be ready */
1385 ret
= sem_wait(&consumer_data
->sem
);
1387 /* Normal timeout if the gettime was successful */
1388 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1389 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1393 if (errno
== ETIMEDOUT
) {
1395 * Call has timed out so we kill the kconsumerd_thread and return
1398 ERR("The consumer thread was never ready. Killing it");
1399 ret
= pthread_cancel(consumer_data
->thread
);
1401 PERROR("pthread_cancel consumer thread");
1404 PERROR("semaphore wait failed consumer thread");
1409 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1410 if (consumer_data
->pid
== 0) {
1411 ERR("Kconsumerd did not start");
1412 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1415 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1424 * Join consumer thread
1426 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1431 if (consumer_data
->pid
!= 0) {
1432 ret
= kill(consumer_data
->pid
, SIGTERM
);
1434 ERR("Error killing consumer daemon");
1437 return pthread_join(consumer_data
->thread
, &status
);
1444 * Fork and exec a consumer daemon (consumerd).
1446 * Return pid if successful else -1.
1448 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1452 const char *verbosity
;
1454 DBG("Spawning consumerd");
1461 if (opt_verbose
> 1 || opt_verbose_consumer
) {
1462 verbosity
= "--verbose";
1464 verbosity
= "--quiet";
1466 switch (consumer_data
->type
) {
1467 case LTTNG_CONSUMER_KERNEL
:
1468 execl(INSTALL_BIN_PATH
"/lttng-consumerd",
1469 "lttng-consumerd", verbosity
, "-k", NULL
);
1471 case LTTNG_CONSUMER_UST
:
1472 execl(INSTALL_BIN_PATH
"/lttng-consumerd",
1473 "lttng-consumerd", verbosity
, "-u", NULL
);
1476 perror("unknown consumer type");
1480 perror("kernel start consumer exec");
1483 } else if (pid
> 0) {
1486 perror("start consumer fork");
1493 * Spawn the consumerd daemon and session daemon thread.
1495 static int start_consumerd(struct consumer_data
*consumer_data
)
1499 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1500 if (consumer_data
->pid
!= 0) {
1501 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1505 ret
= spawn_consumerd(consumer_data
);
1507 ERR("Spawning consumerd failed");
1508 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1512 /* Setting up the consumer_data pid */
1513 consumer_data
->pid
= ret
;
1514 DBG2("Consumer pid %d", consumer_data
->pid
);
1515 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1517 DBG2("Spawning consumer control thread");
1518 ret
= spawn_consumer_thread(consumer_data
);
1520 ERR("Fatal error spawning consumer control thread");
1532 * modprobe_kernel_modules
1534 static int modprobe_kernel_modules(void)
1539 for (i
= 0; i
< ARRAY_SIZE(kernel_modules_list
); i
++) {
1540 ret
= snprintf(modprobe
, sizeof(modprobe
),
1541 "/sbin/modprobe %s%s",
1542 kernel_modules_list
[i
].required
? "" : "-q ",
1543 kernel_modules_list
[i
].name
);
1545 perror("snprintf modprobe");
1548 modprobe
[sizeof(modprobe
) - 1] = '\0';
1549 ret
= system(modprobe
);
1551 ERR("Unable to launch modprobe for module %s",
1552 kernel_modules_list
[i
].name
);
1553 } else if (kernel_modules_list
[i
].required
1554 && WEXITSTATUS(ret
) != 0) {
1555 ERR("Unable to load module %s",
1556 kernel_modules_list
[i
].name
);
1558 DBG("Modprobe successfully %s",
1559 kernel_modules_list
[i
].name
);
1570 static int mount_debugfs(char *path
)
1573 char *type
= "debugfs";
1575 ret
= mkdir_recursive(path
, S_IRWXU
| S_IRWXG
, geteuid(), getegid());
1577 PERROR("Cannot create debugfs path");
1581 ret
= mount(type
, path
, type
, 0, NULL
);
1583 PERROR("Cannot mount debugfs");
1587 DBG("Mounted debugfs successfully at %s", path
);
1594 * Setup necessary data for kernel tracer action.
1596 static void init_kernel_tracer(void)
1599 char *proc_mounts
= "/proc/mounts";
1601 char *debugfs_path
= NULL
, *lttng_path
= NULL
;
1604 /* Detect debugfs */
1605 fp
= fopen(proc_mounts
, "r");
1607 ERR("Unable to probe %s", proc_mounts
);
1611 while (fgets(line
, sizeof(line
), fp
) != NULL
) {
1612 if (strstr(line
, "debugfs") != NULL
) {
1613 /* Remove first string */
1615 /* Dup string here so we can reuse line later on */
1616 debugfs_path
= strdup(strtok(NULL
, " "));
1617 DBG("Got debugfs path : %s", debugfs_path
);
1624 /* Mount debugfs if needded */
1625 if (debugfs_path
== NULL
) {
1626 ret
= asprintf(&debugfs_path
, "/mnt/debugfs");
1628 perror("asprintf debugfs path");
1631 ret
= mount_debugfs(debugfs_path
);
1633 perror("Cannot mount debugfs");
1638 /* Modprobe lttng kernel modules */
1639 ret
= modprobe_kernel_modules();
1644 /* Setup lttng kernel path */
1645 ret
= asprintf(<tng_path
, "%s/lttng", debugfs_path
);
1647 perror("asprintf lttng path");
1651 /* Open debugfs lttng */
1652 kernel_tracer_fd
= open(lttng_path
, O_RDWR
);
1653 if (kernel_tracer_fd
< 0) {
1654 DBG("Failed to open %s", lttng_path
);
1660 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1670 WARN("No kernel tracer available");
1671 kernel_tracer_fd
= 0;
1676 * Init tracing by creating trace directory and sending fds kernel consumer.
1678 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
1682 if (session
->consumer_fds_sent
== 0) {
1684 * Assign default kernel consumer socket if no consumer assigned to the
1685 * kernel session. At this point, it's NOT suppose to be 0 but this is
1686 * an extra security check.
1688 if (session
->consumer_fd
== 0) {
1689 session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1692 ret
= send_kconsumer_session_streams(&kconsumer_data
, session
);
1694 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1698 session
->consumer_fds_sent
= 1;
1706 * Create an UST session and add it to the session ust list.
1708 static int create_ust_session(struct ltt_session
*session
,
1709 struct lttng_domain
*domain
)
1713 struct ltt_ust_session
*lus
= NULL
;
1715 switch (domain
->type
) {
1716 case LTTNG_DOMAIN_UST
:
1719 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1723 DBG("Creating UST session");
1725 session_lock_list();
1726 uid
= session_list_ptr
->count
;
1727 session_unlock_list();
1729 lus
= trace_ust_create_session(session
->path
, uid
, domain
);
1731 ret
= LTTCOMM_UST_SESS_FAIL
;
1735 ret
= mkdir_recursive(lus
->pathname
, S_IRWXU
| S_IRWXG
,
1736 geteuid(), allowed_group());
1738 if (ret
!= -EEXIST
) {
1739 ERR("Trace directory creation error");
1740 ret
= LTTCOMM_UST_SESS_FAIL
;
1745 /* The domain type dictate different actions on session creation */
1746 switch (domain
->type
) {
1747 case LTTNG_DOMAIN_UST
:
1748 /* No ustctl for the global UST domain */
1751 ERR("Unknown UST domain on create session %d", domain
->type
);
1754 session
->ust_session
= lus
;
1764 * Create a kernel tracer session then create the default channel.
1766 static int create_kernel_session(struct ltt_session
*session
)
1770 DBG("Creating kernel session");
1772 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1774 ret
= LTTCOMM_KERN_SESS_FAIL
;
1778 /* Set kernel consumer socket fd */
1779 if (kconsumer_data
.cmd_sock
) {
1780 session
->kernel_session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1783 ret
= mkdir_recursive(session
->kernel_session
->trace_path
,
1784 S_IRWXU
| S_IRWXG
, geteuid(), allowed_group());
1786 if (ret
!= -EEXIST
) {
1787 ERR("Trace directory creation error");
1797 * Using the session list, filled a lttng_session array to send back to the
1798 * client for session listing.
1800 * The session list lock MUST be acquired before calling this function. Use
1801 * session_lock_list() and session_unlock_list().
1803 static void list_lttng_sessions(struct lttng_session
*sessions
)
1806 struct ltt_session
*session
;
1808 DBG("Getting all available session");
1810 * Iterate over session list and append data after the control struct in
1813 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1814 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
1815 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
1816 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
1817 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
1818 sessions
[i
].enabled
= session
->enabled
;
1824 * Fill lttng_channel array of all channels.
1826 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
1827 struct lttng_channel
*channels
)
1830 struct ltt_kernel_channel
*kchan
;
1832 DBG("Listing channels for session %s", session
->name
);
1835 case LTTNG_DOMAIN_KERNEL
:
1836 /* Kernel channels */
1837 if (session
->kernel_session
!= NULL
) {
1838 cds_list_for_each_entry(kchan
,
1839 &session
->kernel_session
->channel_list
.head
, list
) {
1840 /* Copy lttng_channel struct to array */
1841 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
1842 channels
[i
].enabled
= kchan
->enabled
;
1847 case LTTNG_DOMAIN_UST
:
1849 struct cds_lfht_iter iter
;
1850 struct ltt_ust_channel
*uchan
;
1852 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
,
1853 &iter
, uchan
, node
) {
1854 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
1855 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
1856 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
1857 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
1858 channels
[i
].attr
.switch_timer_interval
=
1859 uchan
->attr
.switch_timer_interval
;
1860 channels
[i
].attr
.read_timer_interval
=
1861 uchan
->attr
.read_timer_interval
;
1862 channels
[i
].attr
.output
= uchan
->attr
.output
;
1872 * Create a list of ust global domain events.
1874 static int list_lttng_ust_global_events(char *channel_name
,
1875 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
1878 unsigned int nb_event
= 0;
1879 struct cds_lfht_iter iter
;
1880 struct ltt_ust_channel
*uchan
;
1881 struct ltt_ust_event
*uevent
;
1882 struct lttng_event
*tmp
;
1884 DBG("Listing UST global events for channel %s", channel_name
);
1888 /* Count events in all channels */
1889 cds_lfht_for_each_entry(ust_global
->channels
, &iter
, uchan
, node
) {
1890 nb_event
+= hashtable_get_count(uchan
->events
);
1893 if (nb_event
== 0) {
1898 DBG3("Listing UST global %d events", nb_event
);
1900 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
1902 ret
= -LTTCOMM_FATAL
;
1906 cds_lfht_for_each_entry(ust_global
->channels
, &iter
, uchan
, node
) {
1907 cds_lfht_for_each_entry(uchan
->events
, &iter
, uevent
, node
) {
1908 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
1909 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1910 tmp
[i
].enabled
= uevent
->enabled
;
1911 switch (uevent
->attr
.instrumentation
) {
1912 case LTTNG_UST_TRACEPOINT
:
1913 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1915 case LTTNG_UST_PROBE
:
1916 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
1918 case LTTNG_UST_FUNCTION
:
1919 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
1935 * Fill lttng_event array of all kernel events in the channel.
1937 static int list_lttng_kernel_events(char *channel_name
,
1938 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
1941 unsigned int nb_event
;
1942 struct ltt_kernel_event
*event
;
1943 struct ltt_kernel_channel
*kchan
;
1945 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
1946 if (kchan
== NULL
) {
1947 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1951 nb_event
= kchan
->event_count
;
1953 DBG("Listing events for channel %s", kchan
->channel
->name
);
1955 if (nb_event
== 0) {
1960 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
1961 if (*events
== NULL
) {
1962 ret
= LTTCOMM_FATAL
;
1966 /* Kernel channels */
1967 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
1968 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
1969 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1970 (*events
)[i
].enabled
= event
->enabled
;
1971 switch (event
->event
->instrumentation
) {
1972 case LTTNG_KERNEL_TRACEPOINT
:
1973 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1975 case LTTNG_KERNEL_KPROBE
:
1976 case LTTNG_KERNEL_KRETPROBE
:
1977 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
1978 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
1979 sizeof(struct lttng_kernel_kprobe
));
1981 case LTTNG_KERNEL_FUNCTION
:
1982 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
1983 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
1984 sizeof(struct lttng_kernel_function
));
1986 case LTTNG_KERNEL_NOOP
:
1987 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
1989 case LTTNG_KERNEL_SYSCALL
:
1990 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
1992 case LTTNG_KERNEL_ALL
:
2006 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2008 static int cmd_disable_channel(struct ltt_session
*session
,
2009 int domain
, char *channel_name
)
2014 case LTTNG_DOMAIN_KERNEL
:
2015 ret
= channel_kernel_disable(session
->kernel_session
,
2017 if (ret
!= LTTCOMM_OK
) {
2021 kernel_wait_quiescent(kernel_tracer_fd
);
2023 case LTTNG_DOMAIN_UST_PID
:
2026 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2037 * Copy channel from attributes and set it in the application channel list.
2040 static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2041 struct lttng_channel *attr, struct ust_app *app)
2044 struct ltt_ust_channel *uchan, *new_chan;
2046 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
2047 if (uchan == NULL) {
2048 ret = LTTCOMM_FATAL;
2052 new_chan = trace_ust_create_channel(attr, usess->path);
2053 if (new_chan == NULL) {
2054 PERROR("malloc ltt_ust_channel");
2055 ret = LTTCOMM_FATAL;
2059 ret = channel_ust_copy(new_chan, uchan);
2061 ret = LTTCOMM_FATAL;
2071 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2073 static int cmd_enable_channel(struct ltt_session
*session
,
2074 struct lttng_domain
*domain
, struct lttng_channel
*attr
)
2077 struct ltt_ust_session
*usess
= session
->ust_session
;
2079 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
2081 switch (domain
->type
) {
2082 case LTTNG_DOMAIN_KERNEL
:
2084 struct ltt_kernel_channel
*kchan
;
2086 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
2087 session
->kernel_session
);
2088 if (kchan
== NULL
) {
2089 ret
= channel_kernel_create(session
->kernel_session
,
2090 attr
, kernel_poll_pipe
[1]);
2092 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
2095 if (ret
!= LTTCOMM_OK
) {
2099 kernel_wait_quiescent(kernel_tracer_fd
);
2102 case LTTNG_DOMAIN_UST
:
2104 struct ltt_ust_channel
*uchan
;
2106 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
2108 /* Get channel in global UST domain HT */
2109 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2111 if (uchan
== NULL
) {
2112 uchan
= trace_ust_create_channel(attr
, usess
->pathname
);
2113 if (uchan
== NULL
) {
2114 ret
= LTTCOMM_UST_CHAN_FAIL
;
2119 hashtable_add_unique(usess
->domain_global
.channels
, &uchan
->node
);
2121 DBG2("UST channel %s added to global domain HT", attr
->name
);
2123 ret
= LTTCOMM_UST_CHAN_EXIST
;
2127 /* Add channel to all registered applications */
2128 ret
= ust_app_create_channel_all(usess
, uchan
);
2137 case LTTNG_DOMAIN_UST_PID
:
2141 struct ltt_ust_channel *uchan;
2142 struct ltt_ust_session *usess;
2143 struct ust_app *app;
2145 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
2147 if (usess == NULL) {
2148 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2152 app = ust_app_get_by_pid(domain->attr.pid);
2154 ret = LTTCOMM_APP_NOT_FOUND;
2159 uchan = trace_ust_get_channel_by_name(attr->name, usess);
2160 if (uchan == NULL) {
2161 ret = channel_ust_create(usess, attr, sock);
2163 ret = channel_ust_enable(usess, uchan, sock);
2166 if (ret != LTTCOMM_OK) {
2170 ret = copy_ust_channel_to_app(usess, attr, app);
2171 if (ret != LTTCOMM_OK) {
2175 DBG("UST channel %s created for app sock %d with pid %d",
2176 attr->name, app->sock, domain->attr.pid);
2178 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2182 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2193 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2195 static int cmd_disable_event(struct ltt_session
*session
, int domain
,
2196 char *channel_name
, char *event_name
)
2201 case LTTNG_DOMAIN_KERNEL
:
2203 struct ltt_kernel_channel
*kchan
;
2205 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2206 session
->kernel_session
);
2207 if (kchan
== NULL
) {
2208 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2212 ret
= event_kernel_disable_tracepoint(session
->kernel_session
, kchan
, event_name
);
2213 if (ret
!= LTTCOMM_OK
) {
2217 kernel_wait_quiescent(kernel_tracer_fd
);
2220 case LTTNG_DOMAIN_UST
:
2221 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2222 case LTTNG_DOMAIN_UST_PID
:
2223 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2225 /* TODO: Other UST domains */
2226 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2237 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2239 static int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
2243 struct ltt_kernel_channel
*kchan
;
2246 case LTTNG_DOMAIN_KERNEL
:
2247 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2248 session
->kernel_session
);
2249 if (kchan
== NULL
) {
2250 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2254 ret
= event_kernel_disable_all(session
->kernel_session
, kchan
);
2255 if (ret
!= LTTCOMM_OK
) {
2259 kernel_wait_quiescent(kernel_tracer_fd
);
2262 /* TODO: Userspace tracing */
2263 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2274 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2276 static int cmd_add_context(struct ltt_session
*session
, int domain
,
2277 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
2282 case LTTNG_DOMAIN_KERNEL
:
2283 /* Add kernel context to kernel tracer */
2284 ret
= context_kernel_add(session
->kernel_session
, ctx
,
2285 event_name
, channel_name
);
2286 if (ret
!= LTTCOMM_OK
) {
2290 case LTTNG_DOMAIN_UST
:
2293 struct ltt_ust_session *usess;
2295 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2296 ret = context_ust_add(usess, ctx,
2297 event_name, channel_name, domain);
2298 if (ret != LTTCOMM_OK) {
2306 /* TODO: UST other domains */
2307 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2318 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2320 static int cmd_enable_event(struct ltt_session
*session
, int domain
,
2321 char *channel_name
, struct lttng_event
*event
)
2324 struct lttng_channel
*attr
;
2325 struct ltt_ust_session
*usess
= session
->ust_session
;
2328 case LTTNG_DOMAIN_KERNEL
:
2330 struct ltt_kernel_channel
*kchan
;
2332 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2333 session
->kernel_session
);
2334 if (kchan
== NULL
) {
2335 attr
= channel_new_default_attr(domain
);
2337 ret
= LTTCOMM_FATAL
;
2340 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2342 /* This call will notify the kernel thread */
2343 ret
= channel_kernel_create(session
->kernel_session
,
2344 attr
, kernel_poll_pipe
[1]);
2345 if (ret
!= LTTCOMM_OK
) {
2350 /* Get the newly created kernel channel pointer */
2351 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2352 session
->kernel_session
);
2353 if (kchan
== NULL
) {
2354 /* This sould not happen... */
2355 ret
= LTTCOMM_FATAL
;
2359 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
2361 if (ret
!= LTTCOMM_OK
) {
2365 kernel_wait_quiescent(kernel_tracer_fd
);
2368 case LTTNG_DOMAIN_UST
:
2370 struct ltt_ust_channel
*uchan
;
2371 struct ltt_ust_event
*uevent
;
2373 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2375 if (uchan
== NULL
) {
2376 /* TODO: Create default channel */
2377 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2381 uevent
= trace_ust_find_event_by_name(uchan
->events
, event
->name
);
2382 if (uevent
== NULL
) {
2383 uevent
= trace_ust_create_event(event
);
2384 if (uevent
== NULL
) {
2385 ret
= LTTCOMM_FATAL
;
2391 ret
= ust_app_create_event_all(usess
, uchan
, uevent
);
2393 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2397 /* Add ltt ust event to channel */
2399 hashtable_add_unique(uchan
->events
, &uevent
->node
);
2402 uevent
->enabled
= 1;
2404 DBG3("UST ltt event %s added to channel %s", uevent
->attr
.name
,
2408 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2409 case LTTNG_DOMAIN_UST_PID
:
2410 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2412 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2423 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2425 static int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
2426 char *channel_name
, int event_type
)
2429 struct ltt_kernel_channel
*kchan
;
2432 case LTTNG_DOMAIN_KERNEL
:
2433 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2434 session
->kernel_session
);
2435 if (kchan
== NULL
) {
2436 /* This call will notify the kernel thread */
2437 ret
= channel_kernel_create(session
->kernel_session
, NULL
,
2438 kernel_poll_pipe
[1]);
2439 if (ret
!= LTTCOMM_OK
) {
2444 /* Get the newly created kernel channel pointer */
2445 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2446 session
->kernel_session
);
2447 if (kchan
== NULL
) {
2448 /* This sould not happen... */
2449 ret
= LTTCOMM_FATAL
;
2453 switch (event_type
) {
2454 case LTTNG_KERNEL_SYSCALL
:
2455 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
2456 kchan
, kernel_tracer_fd
);
2458 case LTTNG_KERNEL_TRACEPOINT
:
2460 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2461 * events already registered to the channel.
2463 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
2464 kchan
, kernel_tracer_fd
);
2466 case LTTNG_KERNEL_ALL
:
2467 /* Enable syscalls and tracepoints */
2468 ret
= event_kernel_enable_all(session
->kernel_session
,
2469 kchan
, kernel_tracer_fd
);
2472 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2475 if (ret
!= LTTCOMM_OK
) {
2479 kernel_wait_quiescent(kernel_tracer_fd
);
2482 /* TODO: Userspace tracing */
2483 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2494 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2496 static ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
2499 ssize_t nb_events
= 0;
2502 case LTTNG_DOMAIN_KERNEL
:
2503 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2504 if (nb_events
< 0) {
2505 ret
= LTTCOMM_KERN_LIST_FAIL
;
2509 case LTTNG_DOMAIN_UST
:
2510 nb_events
= ust_app_list_events(events
);
2511 if (nb_events
< 0) {
2512 ret
= LTTCOMM_UST_LIST_FAIL
;
2517 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2524 /* Return negative value to differentiate return code */
2529 * Command LTTNG_START_TRACE processed by the client thread.
2531 static int cmd_start_trace(struct ltt_session
*session
)
2534 struct ltt_kernel_session
*ksession
;
2535 struct ltt_ust_session
*usess
;
2538 ksession
= session
->kernel_session
;
2539 usess
= session
->ust_session
;
2541 if (session
->enabled
)
2542 return LTTCOMM_UST_START_FAIL
;
2543 session
->enabled
= 1;
2545 /* Kernel tracing */
2546 if (ksession
!= NULL
) {
2547 struct ltt_kernel_channel
*kchan
;
2549 /* Open kernel metadata */
2550 if (ksession
->metadata
== NULL
) {
2551 ret
= kernel_open_metadata(ksession
, ksession
->trace_path
);
2553 ret
= LTTCOMM_KERN_META_FAIL
;
2558 /* Open kernel metadata stream */
2559 if (ksession
->metadata_stream_fd
== 0) {
2560 ret
= kernel_open_metadata_stream(ksession
);
2562 ERR("Kernel create metadata stream failed");
2563 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2568 /* For each channel */
2569 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2570 if (kchan
->stream_count
== 0) {
2571 ret
= kernel_open_channel_stream(kchan
);
2573 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2576 /* Update the stream global counter */
2577 ksession
->stream_count_global
+= ret
;
2581 /* Setup kernel consumer socket and send fds to it */
2582 ret
= init_kernel_tracing(ksession
);
2584 ret
= LTTCOMM_KERN_START_FAIL
;
2588 /* This start the kernel tracing */
2589 ret
= kernel_start_session(ksession
);
2591 ret
= LTTCOMM_KERN_START_FAIL
;
2595 /* Quiescent wait after starting trace */
2596 kernel_wait_quiescent(kernel_tracer_fd
);
2599 /* Flag session that trace should start automatically */
2601 usess
->start_trace
= 1;
2603 ret
= ust_app_start_trace_all(usess
);
2605 ret
= LTTCOMM_UST_START_FAIL
;
2617 * Command LTTNG_STOP_TRACE processed by the client thread.
2619 static int cmd_stop_trace(struct ltt_session
*session
)
2622 struct ltt_kernel_channel
*kchan
;
2623 struct ltt_kernel_session
*ksession
;
2624 struct ltt_ust_session
*usess
;
2627 ksession
= session
->kernel_session
;
2628 usess
= session
->ust_session
;
2630 if (!session
->enabled
)
2631 return LTTCOMM_UST_START_FAIL
;
2632 session
->enabled
= 0;
2635 if (ksession
!= NULL
) {
2636 DBG("Stop kernel tracing");
2638 /* Flush all buffers before stopping */
2639 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2641 ERR("Kernel metadata flush failed");
2644 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2645 ret
= kernel_flush_buffer(kchan
);
2647 ERR("Kernel flush buffer error");
2651 ret
= kernel_stop_session(ksession
);
2653 ret
= LTTCOMM_KERN_STOP_FAIL
;
2657 kernel_wait_quiescent(kernel_tracer_fd
);
2660 /* Flag session that trace should start automatically */
2662 usess
->start_trace
= 0;
2664 ret
= ust_app_stop_trace_all(usess
);
2666 ret
= LTTCOMM_UST_START_FAIL
;
2678 * Command LTTNG_CREATE_SESSION processed by the client thread.
2680 static int cmd_create_session(char *name
, char *path
)
2684 ret
= session_create(name
, path
);
2685 if (ret
!= LTTCOMM_OK
) {
2696 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2698 static int cmd_destroy_session(struct ltt_session
*session
, char *name
)
2702 /* Clean kernel session teardown */
2703 teardown_kernel_session(session
);
2704 /* UST session teardown */
2705 teardown_ust_session(session
);
2708 * Must notify the kernel thread here to update it's poll setin order
2709 * to remove the channel(s)' fd just destroyed.
2711 ret
= notify_thread_pipe(kernel_poll_pipe
[1]);
2713 perror("write kernel poll pipe");
2716 ret
= session_destroy(session
);
2722 * Command LTTNG_CALIBRATE processed by the client thread.
2724 static int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
2729 case LTTNG_DOMAIN_KERNEL
:
2731 struct lttng_kernel_calibrate kcalibrate
;
2733 kcalibrate
.type
= calibrate
->type
;
2734 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2736 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2742 /* TODO: Userspace tracing */
2743 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2754 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2756 static int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2762 case LTTNG_DOMAIN_KERNEL
:
2763 /* Can't register a consumer if there is already one */
2764 if (session
->kernel_session
->consumer_fd
!= 0) {
2765 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2769 sock
= lttcomm_connect_unix_sock(sock_path
);
2771 ret
= LTTCOMM_CONNECT_FAIL
;
2775 session
->kernel_session
->consumer_fd
= sock
;
2778 /* TODO: Userspace tracing */
2779 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2790 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2792 static ssize_t
cmd_list_domains(struct ltt_session
*session
,
2793 struct lttng_domain
**domains
)
2798 if (session
->kernel_session
!= NULL
) {
2799 DBG3("Listing domains found kernel domain");
2803 if (session
->ust_session
!= NULL
) {
2804 DBG3("Listing domains found UST global domain");
2808 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2809 if (*domains
== NULL
) {
2810 ret
= -LTTCOMM_FATAL
;
2814 if (session
->kernel_session
!= NULL
) {
2815 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2819 if (session
->ust_session
!= NULL
) {
2820 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2831 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2833 static ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
2834 struct lttng_channel
**channels
)
2837 ssize_t nb_chan
= 0;
2840 case LTTNG_DOMAIN_KERNEL
:
2841 if (session
->kernel_session
!= NULL
) {
2842 nb_chan
= session
->kernel_session
->channel_count
;
2844 DBG3("Number of kernel channels %zd", nb_chan
);
2846 case LTTNG_DOMAIN_UST
:
2847 if (session
->ust_session
!= NULL
) {
2848 nb_chan
= hashtable_get_count(
2849 session
->ust_session
->domain_global
.channels
);
2851 DBG3("Number of UST global channels %zd", nb_chan
);
2855 ret
= -LTTCOMM_NOT_IMPLEMENTED
;
2860 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2861 if (*channels
== NULL
) {
2862 ret
= -LTTCOMM_FATAL
;
2866 list_lttng_channels(domain
, session
, *channels
);
2878 * Command LTTNG_LIST_EVENTS processed by the client thread.
2880 static ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2881 char *channel_name
, struct lttng_event
**events
)
2884 ssize_t nb_event
= 0;
2887 case LTTNG_DOMAIN_KERNEL
:
2888 if (session
->kernel_session
!= NULL
) {
2889 nb_event
= list_lttng_kernel_events(channel_name
,
2890 session
->kernel_session
, events
);
2893 case LTTNG_DOMAIN_UST
:
2895 if (session
->ust_session
!= NULL
) {
2896 nb_event
= list_lttng_ust_global_events(channel_name
,
2897 &session
->ust_session
->domain_global
, events
);
2902 ret
= -LTTCOMM_NOT_IMPLEMENTED
;
2913 * Process the command requested by the lttng client within the command
2914 * context structure. This function make sure that the return structure (llm)
2915 * is set and ready for transmission before returning.
2917 * Return any error encountered or 0 for success.
2919 static int process_client_msg(struct command_ctx
*cmd_ctx
)
2921 int ret
= LTTCOMM_OK
;
2922 int need_tracing_session
= 1;
2924 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2927 * Check for command that don't needs to allocate a returned payload. We do
2928 * this here so we don't have to make the call for no payload at each
2931 switch(cmd_ctx
->lsm
->cmd_type
) {
2932 case LTTNG_LIST_SESSIONS
:
2933 case LTTNG_LIST_TRACEPOINTS
:
2934 case LTTNG_LIST_DOMAINS
:
2935 case LTTNG_LIST_CHANNELS
:
2936 case LTTNG_LIST_EVENTS
:
2939 /* Setup lttng message with no payload */
2940 ret
= setup_lttng_msg(cmd_ctx
, 0);
2942 /* This label does not try to unlock the session */
2943 goto init_setup_error
;
2947 /* Commands that DO NOT need a session. */
2948 switch (cmd_ctx
->lsm
->cmd_type
) {
2949 case LTTNG_CALIBRATE
:
2950 case LTTNG_CREATE_SESSION
:
2951 case LTTNG_LIST_SESSIONS
:
2952 case LTTNG_LIST_TRACEPOINTS
:
2953 need_tracing_session
= 0;
2956 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
2957 session_lock_list();
2958 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
2959 session_unlock_list();
2960 if (cmd_ctx
->session
== NULL
) {
2961 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
2962 ret
= LTTCOMM_SESS_NOT_FOUND
;
2964 /* If no session name specified */
2965 ret
= LTTCOMM_SELECT_SESS
;
2969 /* Acquire lock for the session */
2970 session_lock(cmd_ctx
->session
);
2976 * Check domain type for specific "pre-action".
2978 switch (cmd_ctx
->lsm
->domain
.type
) {
2979 case LTTNG_DOMAIN_KERNEL
:
2980 /* Kernel tracer check */
2981 if (kernel_tracer_fd
== 0) {
2982 /* Basically, load kernel tracer modules */
2983 init_kernel_tracer();
2984 if (kernel_tracer_fd
== 0) {
2985 ret
= LTTCOMM_KERN_NA
;
2990 /* Need a session for kernel command */
2991 if (need_tracing_session
) {
2992 if (cmd_ctx
->session
->kernel_session
== NULL
) {
2993 ret
= create_kernel_session(cmd_ctx
->session
);
2995 ret
= LTTCOMM_KERN_SESS_FAIL
;
3000 /* Start the kernel consumer daemon */
3001 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3002 if (kconsumer_data
.pid
== 0 &&
3003 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3004 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3005 ret
= start_consumerd(&kconsumer_data
);
3007 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3011 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3014 case LTTNG_DOMAIN_UST
:
3016 if (need_tracing_session
) {
3017 if (cmd_ctx
->session
->ust_session
== NULL
) {
3018 ret
= create_ust_session(cmd_ctx
->session
,
3019 &cmd_ctx
->lsm
->domain
);
3020 if (ret
!= LTTCOMM_OK
) {
3024 /* Start the kernel consumer daemon */
3025 pthread_mutex_lock(&ustconsumer_data
.pid_mutex
);
3026 if (ustconsumer_data
.pid
== 0 &&
3027 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3028 pthread_mutex_unlock(&ustconsumer_data
.pid_mutex
);
3029 ret
= start_consumerd(&ustconsumer_data
);
3031 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3035 ust_consumer_fd
= ustconsumer_data
.cmd_sock
;
3037 pthread_mutex_unlock(&ustconsumer_data
.pid_mutex
);
3045 /* Process by command type */
3046 switch (cmd_ctx
->lsm
->cmd_type
) {
3047 case LTTNG_ADD_CONTEXT
:
3049 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3050 cmd_ctx
->lsm
->u
.context
.channel_name
,
3051 cmd_ctx
->lsm
->u
.context
.event_name
,
3052 &cmd_ctx
->lsm
->u
.context
.ctx
);
3055 case LTTNG_DISABLE_CHANNEL
:
3057 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3058 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3061 case LTTNG_DISABLE_EVENT
:
3063 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3064 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3065 cmd_ctx
->lsm
->u
.disable
.name
);
3069 case LTTNG_DISABLE_ALL_EVENT
:
3071 DBG("Disabling all events");
3073 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3074 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3077 case LTTNG_ENABLE_CHANNEL
:
3079 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3080 &cmd_ctx
->lsm
->u
.channel
.chan
);
3083 case LTTNG_ENABLE_EVENT
:
3085 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3086 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3087 &cmd_ctx
->lsm
->u
.enable
.event
);
3090 case LTTNG_ENABLE_ALL_EVENT
:
3092 DBG("Enabling all events");
3094 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3095 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3096 cmd_ctx
->lsm
->u
.enable
.event
.type
);
3099 case LTTNG_LIST_TRACEPOINTS
:
3101 struct lttng_event
*events
;
3104 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3105 if (nb_events
< 0) {
3111 * Setup lttng message with payload size set to the event list size in
3112 * bytes and then copy list into the llm payload.
3114 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3120 /* Copy event list into message payload */
3121 memcpy(cmd_ctx
->llm
->payload
, events
,
3122 sizeof(struct lttng_event
) * nb_events
);
3129 case LTTNG_START_TRACE
:
3131 ret
= cmd_start_trace(cmd_ctx
->session
);
3134 case LTTNG_STOP_TRACE
:
3136 ret
= cmd_stop_trace(cmd_ctx
->session
);
3139 case LTTNG_CREATE_SESSION
:
3141 ret
= cmd_create_session(cmd_ctx
->lsm
->session
.name
,
3142 cmd_ctx
->lsm
->session
.path
);
3145 case LTTNG_DESTROY_SESSION
:
3147 ret
= cmd_destroy_session(cmd_ctx
->session
,
3148 cmd_ctx
->lsm
->session
.name
);
3151 case LTTNG_LIST_DOMAINS
:
3154 struct lttng_domain
*domains
;
3156 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3162 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3167 /* Copy event list into message payload */
3168 memcpy(cmd_ctx
->llm
->payload
, domains
,
3169 nb_dom
* sizeof(struct lttng_domain
));
3176 case LTTNG_LIST_CHANNELS
:
3179 struct lttng_channel
*channels
;
3181 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3182 cmd_ctx
->session
, &channels
);
3188 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3193 /* Copy event list into message payload */
3194 memcpy(cmd_ctx
->llm
->payload
, channels
,
3195 nb_chan
* sizeof(struct lttng_channel
));
3202 case LTTNG_LIST_EVENTS
:
3205 struct lttng_event
*events
= NULL
;
3207 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3208 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3214 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3219 /* Copy event list into message payload */
3220 memcpy(cmd_ctx
->llm
->payload
, events
,
3221 nb_event
* sizeof(struct lttng_event
));
3228 case LTTNG_LIST_SESSIONS
:
3230 session_lock_list();
3232 if (session_list_ptr
->count
== 0) {
3233 ret
= LTTCOMM_NO_SESSION
;
3234 session_unlock_list();
3238 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) *
3239 session_list_ptr
->count
);
3241 session_unlock_list();
3245 /* Filled the session array */
3246 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
));
3248 session_unlock_list();
3253 case LTTNG_CALIBRATE
:
3255 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3256 &cmd_ctx
->lsm
->u
.calibrate
);
3259 case LTTNG_REGISTER_CONSUMER
:
3261 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3262 cmd_ctx
->lsm
->u
.reg
.path
);
3271 if (cmd_ctx
->llm
== NULL
) {
3272 DBG("Missing llm structure. Allocating one.");
3273 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3277 /* Set return code */
3278 cmd_ctx
->llm
->ret_code
= ret
;
3280 if (cmd_ctx
->session
) {
3281 session_unlock(cmd_ctx
->session
);
3288 * This thread manage all clients request using the unix client socket for
3291 static void *thread_manage_clients(void *data
)
3293 int sock
= 0, ret
, i
, pollfd
;
3294 uint32_t revents
, nb_fd
;
3295 struct command_ctx
*cmd_ctx
= NULL
;
3296 struct lttng_poll_event events
;
3298 DBG("[thread] Manage client started");
3300 rcu_register_thread();
3302 ret
= lttcomm_listen_unix_sock(client_sock
);
3308 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3309 * more will be added to this poll set.
3311 ret
= create_thread_poll_set(&events
, 2);
3316 /* Add the application registration socket */
3317 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3323 * Notify parent pid that we are ready to accept command for client side.
3325 if (opt_sig_parent
) {
3326 kill(ppid
, SIGCHLD
);
3330 DBG("Accepting client command ...");
3332 nb_fd
= LTTNG_POLL_GETNB(&events
);
3334 /* Inifinite blocking call, waiting for transmission */
3335 ret
= lttng_poll_wait(&events
, -1);
3340 for (i
= 0; i
< nb_fd
; i
++) {
3341 /* Fetch once the poll data */
3342 revents
= LTTNG_POLL_GETEV(&events
, i
);
3343 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3345 /* Thread quit pipe has been closed. Killing thread. */
3346 ret
= check_thread_quit_pipe(pollfd
, revents
);
3351 /* Event on the registration socket */
3352 if (pollfd
== client_sock
) {
3353 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3354 ERR("Client socket poll error");
3360 DBG("Wait for client response");
3362 sock
= lttcomm_accept_unix_sock(client_sock
);
3367 /* Allocate context command to process the client request */
3368 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3369 if (cmd_ctx
== NULL
) {
3370 perror("zmalloc cmd_ctx");
3374 /* Allocate data buffer for reception */
3375 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3376 if (cmd_ctx
->lsm
== NULL
) {
3377 perror("zmalloc cmd_ctx->lsm");
3381 cmd_ctx
->llm
= NULL
;
3382 cmd_ctx
->session
= NULL
;
3385 * Data is received from the lttng client. The struct
3386 * lttcomm_session_msg (lsm) contains the command and data request of
3389 DBG("Receiving data from client ...");
3390 ret
= lttcomm_recv_unix_sock(sock
, cmd_ctx
->lsm
,
3391 sizeof(struct lttcomm_session_msg
));
3393 DBG("Nothing recv() from client... continuing");
3399 // TODO: Validate cmd_ctx including sanity check for
3400 // security purpose.
3402 rcu_thread_online();
3404 * This function dispatch the work to the kernel or userspace tracer
3405 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3406 * informations for the client. The command context struct contains
3407 * everything this function may needs.
3409 ret
= process_client_msg(cmd_ctx
);
3410 rcu_thread_offline();
3413 * TODO: Inform client somehow of the fatal error. At
3414 * this point, ret < 0 means that a zmalloc failed
3415 * (ENOMEM). Error detected but still accept command.
3417 clean_command_ctx(&cmd_ctx
);
3421 DBG("Sending response (size: %d, retcode: %s)",
3422 cmd_ctx
->lttng_msg_size
,
3423 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3424 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3426 ERR("Failed to send data back to client");
3429 clean_command_ctx(&cmd_ctx
);
3431 /* End of transmission */
3436 DBG("Client thread dying");
3437 unlink(client_unix_sock_path
);
3441 lttng_poll_clean(&events
);
3442 clean_command_ctx(&cmd_ctx
);
3444 rcu_unregister_thread();
3450 * usage function on stderr
3452 static void usage(void)
3454 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3455 fprintf(stderr
, " -h, --help Display this usage.\n");
3456 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3457 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3458 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3459 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3460 fprintf(stderr
, " --ustconsumerd-err-sock PATH Specify path for the UST consumer error socket\n");
3461 fprintf(stderr
, " --ustconsumerd-cmd-sock PATH Specify path for the UST consumer command socket\n");
3462 fprintf(stderr
, " --ustconsumerd-compat32 PATH Specify path for the 32-bit UST consumer daemon binary\n");
3463 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3464 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3465 fprintf(stderr
, " -V, --version Show version number.\n");
3466 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3467 fprintf(stderr
, " -q, --quiet No output at all.\n");
3468 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3469 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3473 * daemon argument parsing
3475 static int parse_args(int argc
, char **argv
)
3479 static struct option long_options
[] = {
3480 { "client-sock", 1, 0, 'c' },
3481 { "apps-sock", 1, 0, 'a' },
3482 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3483 { "kconsumerd-err-sock", 1, 0, 'E' },
3484 { "ustconsumerd-cmd-sock", 1, 0, 'D' },
3485 { "ustconsumerd-err-sock", 1, 0, 'F' },
3486 { "ustconsumerd-compat32", 1, 0, 'u' },
3487 { "daemonize", 0, 0, 'd' },
3488 { "sig-parent", 0, 0, 'S' },
3489 { "help", 0, 0, 'h' },
3490 { "group", 1, 0, 'g' },
3491 { "version", 0, 0, 'V' },
3492 { "quiet", 0, 0, 'q' },
3493 { "verbose", 0, 0, 'v' },
3494 { "verbose-consumer", 0, 0, 'Z' },
3499 int option_index
= 0;
3500 c
= getopt_long(argc
, argv
, "dhqvVS" "a:c:g:s:C:E:D:F:Z:u",
3501 long_options
, &option_index
);
3508 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3510 fprintf(stderr
, " with arg %s\n", optarg
);
3514 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3517 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3523 opt_tracing_group
= optarg
;
3529 fprintf(stdout
, "%s\n", VERSION
);
3535 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3538 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3541 snprintf(ustconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3544 snprintf(ustconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3550 /* Verbose level can increase using multiple -v */
3554 opt_verbose_consumer
+= 1;
3557 compat32_consumer_bindir
= optarg
;
3560 /* Unknown option or other error.
3561 * Error is printed by getopt, just return */
3570 * Creates the two needed socket by the daemon.
3571 * apps_sock - The communication socket for all UST apps.
3572 * client_sock - The communication of the cli tool (lttng).
3574 static int init_daemon_socket(void)
3579 old_umask
= umask(0);
3581 /* Create client tool unix socket */
3582 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
3583 if (client_sock
< 0) {
3584 ERR("Create unix sock failed: %s", client_unix_sock_path
);
3589 /* File permission MUST be 660 */
3590 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3592 ERR("Set file permissions failed: %s", client_unix_sock_path
);
3597 /* Create the application unix socket */
3598 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
3599 if (apps_sock
< 0) {
3600 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
3605 /* File permission MUST be 666 */
3606 ret
= chmod(apps_unix_sock_path
,
3607 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
3609 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
3620 * Check if the global socket is available, and if a daemon is answering at the
3621 * other side. If yes, error is returned.
3623 static int check_existing_daemon(void)
3625 if (access(client_unix_sock_path
, F_OK
) < 0 &&
3626 access(apps_unix_sock_path
, F_OK
) < 0) {
3630 /* Is there anybody out there ? */
3631 if (lttng_session_daemon_alive()) {
3639 * Set the tracing group gid onto the client socket.
3641 * Race window between mkdir and chown is OK because we are going from more
3642 * permissive (root.root) to les permissive (root.tracing).
3644 static int set_permissions(void)
3649 gid
= allowed_group();
3652 WARN("No tracing group detected");
3655 ERR("Missing tracing group. Aborting execution.");
3661 /* Set lttng run dir */
3662 ret
= chown(LTTNG_RUNDIR
, 0, gid
);
3664 ERR("Unable to set group on " LTTNG_RUNDIR
);
3668 /* lttng client socket path */
3669 ret
= chown(client_unix_sock_path
, 0, gid
);
3671 ERR("Unable to set group on %s", client_unix_sock_path
);
3675 /* kconsumer error socket path */
3676 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
3678 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
3682 /* ustconsumer error socket path */
3683 ret
= chown(ustconsumer_data
.err_unix_sock_path
, 0, gid
);
3685 ERR("Unable to set group on %s", ustconsumer_data
.err_unix_sock_path
);
3689 DBG("All permissions are set");
3696 * Create the pipe used to wake up the kernel thread.
3698 static int create_kernel_poll_pipe(void)
3700 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
3704 * Create the application command pipe to wake thread_manage_apps.
3706 static int create_apps_cmd_pipe(void)
3708 return pipe2(apps_cmd_pipe
, O_CLOEXEC
);
3712 * Create the lttng run directory needed for all global sockets and pipe.
3714 static int create_lttng_rundir(void)
3718 ret
= mkdir(LTTNG_RUNDIR
, S_IRWXU
| S_IRWXG
);
3720 if (errno
!= EEXIST
) {
3721 ERR("Unable to create " LTTNG_RUNDIR
);
3733 * Setup sockets and directory needed by the kconsumerd communication with the
3736 static int set_consumer_sockets(struct consumer_data
*consumer_data
)
3739 const char *path
= consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3740 KCONSUMERD_PATH
: USTCONSUMERD_PATH
;
3742 if (strlen(consumer_data
->err_unix_sock_path
) == 0) {
3743 snprintf(consumer_data
->err_unix_sock_path
, PATH_MAX
,
3744 consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3745 KCONSUMERD_ERR_SOCK_PATH
:
3746 USTCONSUMERD_ERR_SOCK_PATH
);
3749 if (strlen(consumer_data
->cmd_unix_sock_path
) == 0) {
3750 snprintf(consumer_data
->cmd_unix_sock_path
, PATH_MAX
,
3751 consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3752 KCONSUMERD_CMD_SOCK_PATH
:
3753 USTCONSUMERD_CMD_SOCK_PATH
);
3756 ret
= mkdir(path
, S_IRWXU
| S_IRWXG
);
3758 if (errno
!= EEXIST
) {
3759 ERR("Failed to create %s", path
);
3765 /* Create the kconsumerd error unix socket */
3766 consumer_data
->err_sock
=
3767 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
3768 if (consumer_data
->err_sock
< 0) {
3769 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
3774 /* File permission MUST be 660 */
3775 ret
= chmod(consumer_data
->err_unix_sock_path
,
3776 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3778 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
3788 * Signal handler for the daemon
3790 * Simply stop all worker threads, leaving main() return gracefully after
3791 * joining all threads and calling cleanup().
3793 static void sighandler(int sig
)
3797 DBG("SIGPIPE catched");
3800 DBG("SIGINT catched");
3804 DBG("SIGTERM catched");
3813 * Setup signal handler for :
3814 * SIGINT, SIGTERM, SIGPIPE
3816 static int set_signal_handler(void)
3819 struct sigaction sa
;
3822 if ((ret
= sigemptyset(&sigset
)) < 0) {
3823 perror("sigemptyset");
3827 sa
.sa_handler
= sighandler
;
3828 sa
.sa_mask
= sigset
;
3830 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
3831 perror("sigaction");
3835 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
3836 perror("sigaction");
3840 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
3841 perror("sigaction");
3845 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
3851 * Set open files limit to unlimited. This daemon can open a large number of
3852 * file descriptors in order to consumer multiple kernel traces.
3854 static void set_ulimit(void)
3859 /* The kernel does not allowed an infinite limit for open files */
3860 lim
.rlim_cur
= 65535;
3861 lim
.rlim_max
= 65535;
3863 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
3865 perror("failed to set open files limit");
3872 int main(int argc
, char **argv
)
3876 const char *home_path
;
3878 rcu_register_thread();
3880 /* Create thread quit pipe */
3881 if ((ret
= init_thread_quit_pipe()) < 0) {
3885 setup_compat32_consumer();
3887 /* Parse arguments */
3889 if ((ret
= parse_args(argc
, argv
) < 0)) {
3902 /* Check if daemon is UID = 0 */
3903 is_root
= !getuid();
3906 ret
= create_lttng_rundir();
3911 if (strlen(apps_unix_sock_path
) == 0) {
3912 snprintf(apps_unix_sock_path
, PATH_MAX
,
3913 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
3916 if (strlen(client_unix_sock_path
) == 0) {
3917 snprintf(client_unix_sock_path
, PATH_MAX
,
3918 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
3921 /* Set global SHM for ust */
3922 if (strlen(wait_shm_path
) == 0) {
3923 snprintf(wait_shm_path
, PATH_MAX
,
3924 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
3927 home_path
= get_home_dir();
3928 if (home_path
== NULL
) {
3929 /* TODO: Add --socket PATH option */
3930 ERR("Can't get HOME directory for sockets creation.");
3935 if (strlen(apps_unix_sock_path
) == 0) {
3936 snprintf(apps_unix_sock_path
, PATH_MAX
,
3937 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
3940 /* Set the cli tool unix socket path */
3941 if (strlen(client_unix_sock_path
) == 0) {
3942 snprintf(client_unix_sock_path
, PATH_MAX
,
3943 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
3946 /* Set global SHM for ust */
3947 if (strlen(wait_shm_path
) == 0) {
3948 snprintf(wait_shm_path
, PATH_MAX
,
3949 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
3953 DBG("Client socket path %s", client_unix_sock_path
);
3954 DBG("Application socket path %s", apps_unix_sock_path
);
3957 * See if daemon already exist.
3959 if ((ret
= check_existing_daemon()) < 0) {
3960 ERR("Already running daemon.\n");
3962 * We do not goto exit because we must not cleanup()
3963 * because a daemon is already running.
3968 /* After this point, we can safely call cleanup() with "goto exit" */
3971 * These actions must be executed as root. We do that *after* setting up
3972 * the sockets path because we MUST make the check for another daemon using
3973 * those paths *before* trying to set the kernel consumer sockets and init
3977 ret
= set_consumer_sockets(&kconsumer_data
);
3982 ret
= set_consumer_sockets(&ustconsumer_data
);
3986 /* Setup kernel tracer */
3987 init_kernel_tracer();
3989 /* Set ulimit for open files */
3993 if ((ret
= set_signal_handler()) < 0) {
3997 /* Setup the needed unix socket */
3998 if ((ret
= init_daemon_socket()) < 0) {
4002 /* Set credentials to socket */
4003 if (is_root
&& ((ret
= set_permissions()) < 0)) {
4007 /* Get parent pid if -S, --sig-parent is specified. */
4008 if (opt_sig_parent
) {
4012 /* Setup the kernel pipe for waking up the kernel thread */
4013 if ((ret
= create_kernel_poll_pipe()) < 0) {
4017 /* Setup the thread apps communication pipe. */
4018 if ((ret
= create_apps_cmd_pipe()) < 0) {
4022 /* Init UST command queue. */
4023 cds_wfq_init(&ust_cmd_queue
.queue
);
4025 /* Init UST app hash table */
4029 * Get session list pointer. This pointer MUST NOT be free(). This list is
4030 * statically declared in session.c
4032 session_list_ptr
= session_get_list();
4034 /* Set up max poll set size */
4035 lttng_poll_set_max_size();
4037 /* Create thread to manage the client socket */
4038 ret
= pthread_create(&client_thread
, NULL
,
4039 thread_manage_clients
, (void *) NULL
);
4041 perror("pthread_create clients");
4045 /* Create thread to dispatch registration */
4046 ret
= pthread_create(&dispatch_thread
, NULL
,
4047 thread_dispatch_ust_registration
, (void *) NULL
);
4049 perror("pthread_create dispatch");
4053 /* Create thread to manage application registration. */
4054 ret
= pthread_create(®_apps_thread
, NULL
,
4055 thread_registration_apps
, (void *) NULL
);
4057 perror("pthread_create registration");
4061 /* Create thread to manage application socket */
4062 ret
= pthread_create(&apps_thread
, NULL
,
4063 thread_manage_apps
, (void *) NULL
);
4065 perror("pthread_create apps");
4069 /* Create kernel thread to manage kernel event */
4070 ret
= pthread_create(&kernel_thread
, NULL
,
4071 thread_manage_kernel
, (void *) NULL
);
4073 perror("pthread_create kernel");
4077 ret
= pthread_join(kernel_thread
, &status
);
4079 perror("pthread_join");
4080 goto error
; /* join error, exit without cleanup */
4084 ret
= pthread_join(apps_thread
, &status
);
4086 perror("pthread_join");
4087 goto error
; /* join error, exit without cleanup */
4091 ret
= pthread_join(reg_apps_thread
, &status
);
4093 perror("pthread_join");
4094 goto error
; /* join error, exit without cleanup */
4098 ret
= pthread_join(dispatch_thread
, &status
);
4100 perror("pthread_join");
4101 goto error
; /* join error, exit without cleanup */
4105 ret
= pthread_join(client_thread
, &status
);
4107 perror("pthread_join");
4108 goto error
; /* join error, exit without cleanup */
4111 ret
= join_consumer_thread(&kconsumer_data
);
4113 perror("join_consumer");
4114 goto error
; /* join error, exit without cleanup */
4120 * cleanup() is called when no other thread is running.
4122 rcu_thread_online();
4124 rcu_thread_offline();
4125 rcu_unregister_thread();