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.
24 #include <semaphore.h>
30 #include <sys/mount.h>
31 #include <sys/resource.h>
32 #include <sys/socket.h>
34 #include <sys/types.h>
36 #include <urcu/futex.h>
40 #include <common/common.h>
41 #include <common/compat/poll.h>
42 #include <common/compat/socket.h>
43 #include <common/defaults.h>
44 #include <common/kernel-consumer/kernel-consumer.h>
45 #include <common/ust-consumer/ust-consumer.h>
47 #include "lttng-sessiond.h"
58 #define CONSUMERD_FILE "lttng-consumerd"
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
];
78 #include "benchmark.h"
81 const char default_home_dir
[] = DEFAULT_HOME_DIR
;
82 const char default_tracing_group
[] = DEFAULT_TRACING_GROUP
;
83 const char default_ust_sock_dir
[] = DEFAULT_UST_SOCK_DIR
;
84 const char default_global_apps_pipe
[] = DEFAULT_GLOBAL_APPS_PIPE
;
87 const char *opt_tracing_group
;
88 static int opt_sig_parent
;
89 static int opt_verbose_consumer
;
90 static int opt_daemon
;
91 static int opt_no_kernel
;
92 static int is_root
; /* Set to 1 if the daemon is running as root */
93 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
,
99 .err_unix_sock_path
= DEFAULT_KCONSUMERD_ERR_SOCK_PATH
,
100 .cmd_unix_sock_path
= DEFAULT_KCONSUMERD_CMD_SOCK_PATH
,
104 static struct consumer_data ustconsumer64_data
= {
105 .type
= LTTNG_CONSUMER64_UST
,
106 .err_unix_sock_path
= DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
,
107 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
,
111 static struct consumer_data ustconsumer32_data
= {
112 .type
= LTTNG_CONSUMER32_UST
,
113 .err_unix_sock_path
= DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
,
114 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
,
119 static int dispatch_thread_exit
;
121 /* Global application Unix socket path */
122 static char apps_unix_sock_path
[PATH_MAX
];
123 /* Global client Unix socket path */
124 static char client_unix_sock_path
[PATH_MAX
];
125 /* global wait shm path for UST */
126 static char wait_shm_path
[PATH_MAX
];
128 /* Sockets and FDs */
129 static int client_sock
= -1;
130 static int apps_sock
= -1;
131 static int kernel_tracer_fd
= -1;
132 static int kernel_poll_pipe
[2] = { -1, -1 };
135 * Quit pipe for all threads. This permits a single cancellation point
136 * for all threads when receiving an event on the pipe.
138 static int thread_quit_pipe
[2] = { -1, -1 };
141 * This pipe is used to inform the thread managing application communication
142 * that a command is queued and ready to be processed.
144 static int apps_cmd_pipe
[2] = { -1, -1 };
146 /* Pthread, Mutexes and Semaphores */
147 static pthread_t apps_thread
;
148 static pthread_t reg_apps_thread
;
149 static pthread_t client_thread
;
150 static pthread_t kernel_thread
;
151 static pthread_t dispatch_thread
;
155 * UST registration command queue. This queue is tied with a futex and uses a N
156 * wakers / 1 waiter implemented and detailed in futex.c/.h
158 * The thread_manage_apps and thread_dispatch_ust_registration interact with
159 * this queue and the wait/wake scheme.
161 static struct ust_cmd_queue ust_cmd_queue
;
164 * Pointer initialized before thread creation.
166 * This points to the tracing session list containing the session count and a
167 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
168 * MUST NOT be taken if you call a public function in session.c.
170 * The lock is nested inside the structure: session_list_ptr->lock. Please use
171 * session_lock_list and session_unlock_list for lock acquisition.
173 static struct ltt_session_list
*session_list_ptr
;
175 int ust_consumerd64_fd
= -1;
176 int ust_consumerd32_fd
= -1;
178 static const char *consumerd32_bin
= CONFIG_CONSUMERD32_BIN
;
179 static const char *consumerd64_bin
= CONFIG_CONSUMERD64_BIN
;
180 static const char *consumerd32_libdir
= CONFIG_CONSUMERD32_LIBDIR
;
181 static const char *consumerd64_libdir
= CONFIG_CONSUMERD64_LIBDIR
;
184 void setup_consumerd_path(void)
186 const char *bin
, *libdir
;
189 * Allow INSTALL_BIN_PATH to be used as a target path for the
190 * native architecture size consumer if CONFIG_CONSUMER*_PATH
191 * has not been defined.
193 #if (CAA_BITS_PER_LONG == 32)
194 if (!consumerd32_bin
[0]) {
195 consumerd32_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
197 if (!consumerd32_libdir
[0]) {
198 consumerd32_libdir
= INSTALL_LIB_PATH
;
200 #elif (CAA_BITS_PER_LONG == 64)
201 if (!consumerd64_bin
[0]) {
202 consumerd64_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
204 if (!consumerd64_libdir
[0]) {
205 consumerd64_libdir
= INSTALL_LIB_PATH
;
208 #error "Unknown bitness"
212 * runtime env. var. overrides the build default.
214 bin
= getenv("LTTNG_CONSUMERD32_BIN");
216 consumerd32_bin
= bin
;
218 bin
= getenv("LTTNG_CONSUMERD64_BIN");
220 consumerd64_bin
= bin
;
222 libdir
= getenv("LTTNG_CONSUMERD32_LIBDIR");
224 consumerd32_libdir
= libdir
;
226 libdir
= getenv("LTTNG_CONSUMERD64_LIBDIR");
228 consumerd64_libdir
= libdir
;
233 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
235 static int create_thread_poll_set(struct lttng_poll_event
*events
,
240 if (events
== NULL
|| size
== 0) {
245 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
251 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
263 * Check if the thread quit pipe was triggered.
265 * Return 1 if it was triggered else 0;
267 static int check_thread_quit_pipe(int fd
, uint32_t events
)
269 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
277 * Return group ID of the tracing group or -1 if not found.
279 static gid_t
allowed_group(void)
283 if (opt_tracing_group
) {
284 grp
= getgrnam(opt_tracing_group
);
286 grp
= getgrnam(default_tracing_group
);
296 * Init thread quit pipe.
298 * Return -1 on error or 0 if all pipes are created.
300 static int init_thread_quit_pipe(void)
304 ret
= pipe(thread_quit_pipe
);
306 PERROR("thread quit pipe");
310 for (i
= 0; i
< 2; i
++) {
311 ret
= fcntl(thread_quit_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
323 * Complete teardown of a kernel session. This free all data structure related
324 * to a kernel session and update counter.
326 static void teardown_kernel_session(struct ltt_session
*session
)
328 if (!session
->kernel_session
) {
329 DBG3("No kernel session when tearing down session");
333 DBG("Tearing down kernel session");
336 * If a custom kernel consumer was registered, close the socket before
337 * tearing down the complete kernel session structure
339 if (kconsumer_data
.cmd_sock
>= 0 &&
340 session
->kernel_session
->consumer_fd
!= kconsumer_data
.cmd_sock
) {
341 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
344 trace_kernel_destroy_session(session
->kernel_session
);
348 * Complete teardown of all UST sessions. This will free everything on his path
349 * and destroy the core essence of all ust sessions :)
351 static void teardown_ust_session(struct ltt_session
*session
)
355 if (!session
->ust_session
) {
356 DBG3("No UST session when tearing down session");
360 DBG("Tearing down UST session(s)");
362 ret
= ust_app_destroy_trace_all(session
->ust_session
);
364 ERR("Error in ust_app_destroy_trace_all");
367 trace_ust_destroy_session(session
->ust_session
);
371 * Stop all threads by closing the thread quit pipe.
373 static void stop_threads(void)
377 /* Stopping all threads */
378 DBG("Terminating all threads");
379 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
381 ERR("write error on thread quit pipe");
384 /* Dispatch thread */
385 dispatch_thread_exit
= 1;
386 futex_nto1_wake(&ust_cmd_queue
.futex
);
392 static void cleanup(void)
396 struct ltt_session
*sess
, *stmp
;
400 DBG("Removing %s directory", rundir
);
401 ret
= asprintf(&cmd
, "rm -rf %s", rundir
);
403 ERR("asprintf failed. Something is really wrong!");
406 /* Remove lttng run directory */
409 ERR("Unable to clean %s", rundir
);
413 DBG("Cleaning up all sessions");
415 /* Destroy session list mutex */
416 if (session_list_ptr
!= NULL
) {
417 pthread_mutex_destroy(&session_list_ptr
->lock
);
419 /* Cleanup ALL session */
420 cds_list_for_each_entry_safe(sess
, stmp
,
421 &session_list_ptr
->head
, list
) {
422 teardown_kernel_session(sess
);
423 teardown_ust_session(sess
);
428 DBG("Closing all UST sockets");
429 ust_app_clean_list();
431 pthread_mutex_destroy(&kconsumer_data
.pid_mutex
);
433 if (is_root
&& !opt_no_kernel
) {
434 DBG2("Closing kernel fd");
435 if (kernel_tracer_fd
>= 0) {
436 ret
= close(kernel_tracer_fd
);
441 DBG("Unloading kernel modules");
442 modprobe_remove_lttng_all();
446 * Closing all pipes used for communication between threads.
448 for (i
= 0; i
< 2; i
++) {
449 if (kernel_poll_pipe
[i
] >= 0) {
450 ret
= close(kernel_poll_pipe
[i
]);
457 for (i
= 0; i
< 2; i
++) {
458 if (thread_quit_pipe
[i
] >= 0) {
459 ret
= close(thread_quit_pipe
[i
]);
465 for (i
= 0; i
< 2; i
++) {
466 if (apps_cmd_pipe
[i
] >= 0) {
467 ret
= close(apps_cmd_pipe
[i
]);
474 /* OUTPUT BENCHMARK RESULTS */
477 if (getenv("BENCH_UST_NOTIFY")) {
478 bench_print_ust_notification();
481 if (getenv("BENCH_UST_REGISTER")) {
482 bench_print_ust_register();
483 bench_print_ust_unregister();
486 if (getenv("BENCH_BOOT_PROCESS")) {
487 bench_print_boot_process();
494 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
495 "Matthew, BEET driven development works!%c[%dm",
496 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
501 * Send data on a unix socket using the liblttsessiondcomm API.
503 * Return lttcomm error code.
505 static int send_unix_sock(int sock
, void *buf
, size_t len
)
507 /* Check valid length */
512 return lttcomm_send_unix_sock(sock
, buf
, len
);
516 * Free memory of a command context structure.
518 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
520 DBG("Clean command context structure");
522 if ((*cmd_ctx
)->llm
) {
523 free((*cmd_ctx
)->llm
);
525 if ((*cmd_ctx
)->lsm
) {
526 free((*cmd_ctx
)->lsm
);
534 * Send all stream fds of kernel channel to the consumer.
536 static int send_kconsumer_channel_streams(struct consumer_data
*consumer_data
,
537 int sock
, struct ltt_kernel_channel
*channel
,
538 uid_t uid
, gid_t gid
)
541 struct ltt_kernel_stream
*stream
;
542 struct lttcomm_consumer_msg lkm
;
544 DBG("Sending streams of channel %s to kernel consumer",
545 channel
->channel
->name
);
548 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
549 lkm
.u
.channel
.channel_key
= channel
->fd
;
550 lkm
.u
.channel
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
551 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
552 DBG("Sending channel %d to consumer", lkm
.u
.channel
.channel_key
);
553 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
555 PERROR("send consumer channel");
560 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
564 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
565 lkm
.u
.stream
.channel_key
= channel
->fd
;
566 lkm
.u
.stream
.stream_key
= stream
->fd
;
567 lkm
.u
.stream
.state
= stream
->state
;
568 lkm
.u
.stream
.output
= channel
->channel
->attr
.output
;
569 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
570 lkm
.u
.stream
.uid
= uid
;
571 lkm
.u
.stream
.gid
= gid
;
572 strncpy(lkm
.u
.stream
.path_name
, stream
->pathname
, PATH_MAX
- 1);
573 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
574 DBG("Sending stream %d to consumer", lkm
.u
.stream
.stream_key
);
575 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
577 PERROR("send consumer stream");
580 ret
= lttcomm_send_fds_unix_sock(sock
, &stream
->fd
, 1);
582 PERROR("send consumer stream ancillary data");
587 DBG("consumer channel streams sent");
596 * Send all stream fds of the kernel session to the consumer.
598 static int send_kconsumer_session_streams(struct consumer_data
*consumer_data
,
599 struct ltt_kernel_session
*session
)
602 struct ltt_kernel_channel
*chan
;
603 struct lttcomm_consumer_msg lkm
;
604 int sock
= session
->consumer_fd
;
606 DBG("Sending metadata stream fd");
608 /* Extra protection. It's NOT supposed to be set to -1 at this point */
609 if (session
->consumer_fd
< 0) {
610 session
->consumer_fd
= consumer_data
->cmd_sock
;
613 if (session
->metadata_stream_fd
>= 0) {
614 /* Send metadata channel fd */
615 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
616 lkm
.u
.channel
.channel_key
= session
->metadata
->fd
;
617 lkm
.u
.channel
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
618 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
619 DBG("Sending metadata channel %d to consumer", lkm
.u
.stream
.stream_key
);
620 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
622 PERROR("send consumer channel");
626 /* Send metadata stream fd */
627 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
628 lkm
.u
.stream
.channel_key
= session
->metadata
->fd
;
629 lkm
.u
.stream
.stream_key
= session
->metadata_stream_fd
;
630 lkm
.u
.stream
.state
= LTTNG_CONSUMER_ACTIVE_STREAM
;
631 lkm
.u
.stream
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
632 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
633 lkm
.u
.stream
.uid
= session
->uid
;
634 lkm
.u
.stream
.gid
= session
->gid
;
635 strncpy(lkm
.u
.stream
.path_name
, session
->metadata
->pathname
, PATH_MAX
- 1);
636 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
637 DBG("Sending metadata stream %d to consumer", lkm
.u
.stream
.stream_key
);
638 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
640 PERROR("send consumer stream");
643 ret
= lttcomm_send_fds_unix_sock(sock
, &session
->metadata_stream_fd
, 1);
645 PERROR("send consumer stream");
650 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
651 ret
= send_kconsumer_channel_streams(consumer_data
, sock
, chan
,
652 session
->uid
, session
->gid
);
658 DBG("consumer fds (metadata and channel streams) sent");
667 * Notify UST applications using the shm mmap futex.
669 static int notify_ust_apps(int active
)
673 DBG("Notifying applications of session daemon state: %d", active
);
675 /* See shm.c for this call implying mmap, shm and futex calls */
676 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
677 if (wait_shm_mmap
== NULL
) {
681 tracepoint(ust_notify_apps_start
);
683 /* Wake waiting process */
684 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
686 tracepoint(ust_notify_apps_stop
);
688 /* Apps notified successfully */
696 * Setup the outgoing data buffer for the response (llm) by allocating the
697 * right amount of memory and copying the original information from the lsm
700 * Return total size of the buffer pointed by buf.
702 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
708 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
709 if (cmd_ctx
->llm
== NULL
) {
715 /* Copy common data */
716 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
717 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
719 cmd_ctx
->llm
->data_size
= size
;
720 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
729 * Update the kernel poll set of all channel fd available over all tracing
730 * session. Add the wakeup pipe at the end of the set.
732 static int update_kernel_poll(struct lttng_poll_event
*events
)
735 struct ltt_session
*session
;
736 struct ltt_kernel_channel
*channel
;
738 DBG("Updating kernel poll set");
741 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
742 session_lock(session
);
743 if (session
->kernel_session
== NULL
) {
744 session_unlock(session
);
748 cds_list_for_each_entry(channel
,
749 &session
->kernel_session
->channel_list
.head
, list
) {
750 /* Add channel fd to the kernel poll set */
751 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
753 session_unlock(session
);
756 DBG("Channel fd %d added to kernel set", channel
->fd
);
758 session_unlock(session
);
760 session_unlock_list();
765 session_unlock_list();
770 * Find the channel fd from 'fd' over all tracing session. When found, check
771 * for new channel stream and send those stream fds to the kernel consumer.
773 * Useful for CPU hotplug feature.
775 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
778 struct ltt_session
*session
;
779 struct ltt_kernel_channel
*channel
;
781 DBG("Updating kernel streams for channel fd %d", fd
);
784 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
785 session_lock(session
);
786 if (session
->kernel_session
== NULL
) {
787 session_unlock(session
);
791 /* This is not suppose to be -1 but this is an extra security check */
792 if (session
->kernel_session
->consumer_fd
< 0) {
793 session
->kernel_session
->consumer_fd
= consumer_data
->cmd_sock
;
796 cds_list_for_each_entry(channel
,
797 &session
->kernel_session
->channel_list
.head
, list
) {
798 if (channel
->fd
== fd
) {
799 DBG("Channel found, updating kernel streams");
800 ret
= kernel_open_channel_stream(channel
);
806 * Have we already sent fds to the consumer? If yes, it means
807 * that tracing is started so it is safe to send our updated
810 if (session
->kernel_session
->consumer_fds_sent
== 1) {
811 ret
= send_kconsumer_channel_streams(consumer_data
,
812 session
->kernel_session
->consumer_fd
, channel
,
813 session
->uid
, session
->gid
);
821 session_unlock(session
);
823 session_unlock_list();
827 session_unlock(session
);
828 session_unlock_list();
833 * For each tracing session, update newly registered apps.
835 static void update_ust_app(int app_sock
)
837 struct ltt_session
*sess
, *stmp
;
841 /* For all tracing session(s) */
842 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
844 if (sess
->ust_session
) {
845 ust_app_global_update(sess
->ust_session
, app_sock
);
847 session_unlock(sess
);
850 session_unlock_list();
854 * This thread manage event coming from the kernel.
856 * Features supported in this thread:
859 static void *thread_manage_kernel(void *data
)
861 int ret
, i
, pollfd
, update_poll_flag
= 1;
862 uint32_t revents
, nb_fd
;
864 struct lttng_poll_event events
;
866 tracepoint(sessiond_th_kern_start
);
868 DBG("Thread manage kernel started");
870 ret
= create_thread_poll_set(&events
, 2);
872 goto error_poll_create
;
875 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
881 if (update_poll_flag
== 1) {
883 * Reset number of fd in the poll set. Always 2 since there is the thread
884 * quit pipe and the kernel pipe.
888 ret
= update_kernel_poll(&events
);
892 update_poll_flag
= 0;
895 nb_fd
= LTTNG_POLL_GETNB(&events
);
897 DBG("Thread kernel polling on %d fds", nb_fd
);
899 /* Zeroed the poll events */
900 lttng_poll_reset(&events
);
902 tracepoint(sessiond_th_kern_poll
);
904 /* Poll infinite value of time */
906 ret
= lttng_poll_wait(&events
, -1);
909 * Restart interrupted system call.
911 if (errno
== EINTR
) {
915 } else if (ret
== 0) {
916 /* Should not happen since timeout is infinite */
917 ERR("Return value of poll is 0 with an infinite timeout.\n"
918 "This should not have happened! Continuing...");
922 for (i
= 0; i
< nb_fd
; i
++) {
923 /* Fetch once the poll data */
924 revents
= LTTNG_POLL_GETEV(&events
, i
);
925 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
927 /* Thread quit pipe has been closed. Killing thread. */
928 ret
= check_thread_quit_pipe(pollfd
, revents
);
933 /* Check for data on kernel pipe */
934 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
935 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
936 update_poll_flag
= 1;
940 * New CPU detected by the kernel. Adding kernel stream to
941 * kernel session and updating the kernel consumer
943 if (revents
& LPOLLIN
) {
944 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
950 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
951 * and unregister kernel stream at this point.
959 lttng_poll_clean(&events
);
961 DBG("Kernel thread dying");
966 * This thread manage the consumer error sent back to the session daemon.
968 static void *thread_manage_consumer(void *data
)
970 int sock
= -1, i
, ret
, pollfd
;
971 uint32_t revents
, nb_fd
;
972 enum lttcomm_return_code code
;
973 struct lttng_poll_event events
;
974 struct consumer_data
*consumer_data
= data
;
976 tracepoint(sessiond_th_kcon_start
);
978 DBG("[thread] Manage consumer started");
980 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
986 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
987 * Nothing more will be added to this poll set.
989 ret
= create_thread_poll_set(&events
, 2);
994 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
999 nb_fd
= LTTNG_POLL_GETNB(&events
);
1001 tracepoint(sessiond_th_kcon_poll
);
1003 /* Inifinite blocking call, waiting for transmission */
1005 ret
= lttng_poll_wait(&events
, -1);
1008 * Restart interrupted system call.
1010 if (errno
== EINTR
) {
1016 for (i
= 0; i
< nb_fd
; i
++) {
1017 /* Fetch once the poll data */
1018 revents
= LTTNG_POLL_GETEV(&events
, i
);
1019 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1021 /* Thread quit pipe has been closed. Killing thread. */
1022 ret
= check_thread_quit_pipe(pollfd
, revents
);
1027 /* Event on the registration socket */
1028 if (pollfd
== consumer_data
->err_sock
) {
1029 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1030 ERR("consumer err socket poll error");
1036 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
1041 DBG2("Receiving code from consumer err_sock");
1043 /* Getting status code from kconsumerd */
1044 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1045 sizeof(enum lttcomm_return_code
));
1050 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
1051 consumer_data
->cmd_sock
=
1052 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1053 if (consumer_data
->cmd_sock
< 0) {
1054 sem_post(&consumer_data
->sem
);
1055 PERROR("consumer connect");
1058 /* Signal condition to tell that the kconsumerd is ready */
1059 sem_post(&consumer_data
->sem
);
1060 DBG("consumer command socket ready");
1062 ERR("consumer error when waiting for SOCK_READY : %s",
1063 lttcomm_get_readable_code(-code
));
1067 /* Remove the kconsumerd error sock since we've established a connexion */
1068 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1073 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1078 /* Update number of fd */
1079 nb_fd
= LTTNG_POLL_GETNB(&events
);
1081 /* Inifinite blocking call, waiting for transmission */
1083 ret
= lttng_poll_wait(&events
, -1);
1086 * Restart interrupted system call.
1088 if (errno
== EINTR
) {
1094 for (i
= 0; i
< nb_fd
; i
++) {
1095 /* Fetch once the poll data */
1096 revents
= LTTNG_POLL_GETEV(&events
, i
);
1097 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1099 /* Thread quit pipe has been closed. Killing thread. */
1100 ret
= check_thread_quit_pipe(pollfd
, revents
);
1105 /* Event on the kconsumerd socket */
1106 if (pollfd
== sock
) {
1107 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1108 ERR("consumer err socket second poll error");
1114 /* Wait for any kconsumerd error */
1115 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1116 sizeof(enum lttcomm_return_code
));
1118 ERR("consumer closed the command socket");
1122 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
1125 if (consumer_data
->err_sock
>= 0) {
1126 ret
= close(consumer_data
->err_sock
);
1131 if (consumer_data
->cmd_sock
>= 0) {
1132 ret
= close(consumer_data
->cmd_sock
);
1144 unlink(consumer_data
->err_unix_sock_path
);
1145 unlink(consumer_data
->cmd_unix_sock_path
);
1146 consumer_data
->pid
= 0;
1148 lttng_poll_clean(&events
);
1151 DBG("consumer thread cleanup completed");
1157 * This thread manage application communication.
1159 static void *thread_manage_apps(void *data
)
1162 uint32_t revents
, nb_fd
;
1163 struct ust_command ust_cmd
;
1164 struct lttng_poll_event events
;
1166 tracepoint(sessiond_th_apps_start
);
1168 DBG("[thread] Manage application started");
1170 rcu_register_thread();
1171 rcu_thread_online();
1173 ret
= create_thread_poll_set(&events
, 2);
1175 goto error_poll_create
;
1178 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1184 /* Zeroed the events structure */
1185 lttng_poll_reset(&events
);
1187 nb_fd
= LTTNG_POLL_GETNB(&events
);
1189 DBG("Apps thread polling on %d fds", nb_fd
);
1191 tracepoint(sessiond_th_apps_poll
);
1193 /* Inifinite blocking call, waiting for transmission */
1195 ret
= lttng_poll_wait(&events
, -1);
1198 * Restart interrupted system call.
1200 if (errno
== EINTR
) {
1206 for (i
= 0; i
< nb_fd
; i
++) {
1207 /* Fetch once the poll data */
1208 revents
= LTTNG_POLL_GETEV(&events
, i
);
1209 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1211 /* Thread quit pipe has been closed. Killing thread. */
1212 ret
= check_thread_quit_pipe(pollfd
, revents
);
1217 /* Inspect the apps cmd pipe */
1218 if (pollfd
== apps_cmd_pipe
[0]) {
1219 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1220 ERR("Apps command pipe error");
1222 } else if (revents
& LPOLLIN
) {
1223 system("sysctl vm.drop_caches=3");
1224 tracepoint(ust_register_read_start
);
1226 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1227 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1228 PERROR("read apps cmd pipe");
1231 tracepoint(ust_register_read_stop
);
1233 tracepoint(ust_register_add_start
);
1234 /* Register applicaton to the session daemon */
1235 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1237 if (ret
== -ENOMEM
) {
1239 } else if (ret
< 0) {
1242 tracepoint(ust_register_add_stop
);
1245 * Validate UST version compatibility.
1247 ret
= ust_app_validate_version(ust_cmd
.sock
);
1250 * Add channel(s) and event(s) to newly registered apps
1251 * from lttng global UST domain.
1253 update_ust_app(ust_cmd
.sock
);
1256 tracepoint(ust_register_done_start
);
1257 ret
= ust_app_register_done(ust_cmd
.sock
);
1260 * If the registration is not possible, we simply
1261 * unregister the apps and continue
1263 ust_app_unregister(ust_cmd
.sock
);
1265 tracepoint(ust_register_done_stop
);
1267 * We just need here to monitor the close of the UST
1268 * socket and poll set monitor those by default.
1269 * Listen on POLLIN (even if we never expect any
1270 * data) to ensure that hangup wakes us.
1272 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, LPOLLIN
);
1277 DBG("Apps with sock %d added to poll set",
1284 * At this point, we know that a registered application made
1285 * the event at poll_wait.
1287 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1288 tracepoint(ust_unregister_start
);
1290 /* Removing from the poll set */
1291 ret
= lttng_poll_del(&events
, pollfd
);
1296 /* Socket closed on remote end. */
1297 ust_app_unregister(pollfd
);
1299 tracepoint(ust_unregister_stop
);
1307 lttng_poll_clean(&events
);
1309 DBG("Application communication apps thread cleanup complete");
1310 rcu_thread_offline();
1311 rcu_unregister_thread();
1316 * Dispatch request from the registration threads to the application
1317 * communication thread.
1319 static void *thread_dispatch_ust_registration(void *data
)
1322 struct cds_wfq_node
*node
;
1323 struct ust_command
*ust_cmd
= NULL
;
1325 tracepoint(sessiond_th_dispatch_start
);
1327 DBG("[thread] Dispatch UST command started");
1329 while (!dispatch_thread_exit
) {
1330 /* Atomically prepare the queue futex */
1331 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1334 tracepoint(sessiond_th_dispatch_block
);
1336 /* Dequeue command for registration */
1337 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1339 DBG("Woken up but nothing in the UST command queue");
1340 /* Continue thread execution */
1344 tracepoint(ust_dispatch_register_start
);
1346 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1348 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1349 " gid:%d sock:%d name:%s (version %d.%d)",
1350 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1351 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1352 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1353 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1355 * Inform apps thread of the new application registration. This
1356 * call is blocking so we can be assured that the data will be read
1357 * at some point in time or wait to the end of the world :)
1359 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1360 sizeof(struct ust_command
));
1362 PERROR("write apps cmd pipe");
1363 if (errno
== EBADF
) {
1365 * We can't inform the application thread to process
1366 * registration. We will exit or else application
1367 * registration will not occur and tracing will never
1374 } while (node
!= NULL
);
1376 tracepoint(ust_dispatch_register_stop
);
1378 /* Futex wait on queue. Blocking call on futex() */
1379 futex_nto1_wait(&ust_cmd_queue
.futex
);
1383 DBG("Dispatch thread dying");
1388 * This thread manage application registration.
1390 static void *thread_registration_apps(void *data
)
1392 int sock
= -1, i
, ret
, pollfd
;
1393 uint32_t revents
, nb_fd
;
1394 struct lttng_poll_event events
;
1396 * Get allocated in this thread, enqueued to a global queue, dequeued and
1397 * freed in the manage apps thread.
1399 struct ust_command
*ust_cmd
= NULL
;
1401 tracepoint(sessiond_th_reg_start
);
1403 DBG("[thread] Manage application registration started");
1405 ret
= lttcomm_listen_unix_sock(apps_sock
);
1411 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1412 * more will be added to this poll set.
1414 ret
= create_thread_poll_set(&events
, 2);
1416 goto error_create_poll
;
1419 /* Add the application registration socket */
1420 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1422 goto error_poll_add
;
1425 /* Notify all applications to register */
1426 ret
= notify_ust_apps(1);
1428 ERR("Failed to notify applications or create the wait shared memory.\n"
1429 "Execution continues but there might be problem for already\n"
1430 "running applications that wishes to register.");
1434 DBG("Accepting application registration");
1436 tracepoint(sessiond_th_reg_poll
);
1438 nb_fd
= LTTNG_POLL_GETNB(&events
);
1440 /* Inifinite blocking call, waiting for transmission */
1442 ret
= lttng_poll_wait(&events
, -1);
1445 * Restart interrupted system call.
1447 if (errno
== EINTR
) {
1453 for (i
= 0; i
< nb_fd
; i
++) {
1454 /* Fetch once the poll data */
1455 revents
= LTTNG_POLL_GETEV(&events
, i
);
1456 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1458 /* Thread quit pipe has been closed. Killing thread. */
1459 ret
= check_thread_quit_pipe(pollfd
, revents
);
1464 /* Event on the registration socket */
1465 if (pollfd
== apps_sock
) {
1466 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1467 ERR("Register apps socket poll error");
1469 } else if (revents
& LPOLLIN
) {
1470 /* Registration starts here. Recording cycles */
1471 tracepoint(ust_register_start
);
1473 sock
= lttcomm_accept_unix_sock(apps_sock
);
1478 /* Create UST registration command for enqueuing */
1479 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1480 if (ust_cmd
== NULL
) {
1481 PERROR("ust command zmalloc");
1486 * Using message-based transmissions to ensure we don't
1487 * have to deal with partially received messages.
1489 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1490 sizeof(struct ust_register_msg
));
1491 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1493 PERROR("lttcomm_recv_unix_sock register apps");
1495 ERR("Wrong size received on apps register");
1506 ust_cmd
->sock
= sock
;
1509 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1510 " gid:%d sock:%d name:%s (version %d.%d)",
1511 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1512 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1513 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1514 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1517 * Lock free enqueue the registration request. The red pill
1518 * has been taken! This apps will be part of the *system*.
1520 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1523 * Wake the registration queue futex. Implicit memory
1524 * barrier with the exchange in cds_wfq_enqueue.
1526 futex_nto1_wake(&ust_cmd_queue
.futex
);
1528 tracepoint(ust_register_stop
);
1535 /* Notify that the registration thread is gone */
1538 if (apps_sock
>= 0) {
1539 ret
= close(apps_sock
);
1550 unlink(apps_unix_sock_path
);
1553 lttng_poll_clean(&events
);
1556 DBG("UST Registration thread cleanup complete");
1562 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1563 * exec or it will fails.
1565 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1568 struct timespec timeout
;
1570 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1571 timeout
.tv_nsec
= 0;
1573 /* Setup semaphore */
1574 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1576 PERROR("sem_init consumer semaphore");
1580 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1581 thread_manage_consumer
, consumer_data
);
1583 PERROR("pthread_create consumer");
1588 /* Get time for sem_timedwait absolute timeout */
1589 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1591 PERROR("clock_gettime spawn consumer");
1592 /* Infinite wait for the kconsumerd thread to be ready */
1593 ret
= sem_wait(&consumer_data
->sem
);
1595 /* Normal timeout if the gettime was successful */
1596 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1597 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1601 if (errno
== ETIMEDOUT
) {
1603 * Call has timed out so we kill the kconsumerd_thread and return
1606 ERR("The consumer thread was never ready. Killing it");
1607 ret
= pthread_cancel(consumer_data
->thread
);
1609 PERROR("pthread_cancel consumer thread");
1612 PERROR("semaphore wait failed consumer thread");
1617 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1618 if (consumer_data
->pid
== 0) {
1619 ERR("Kconsumerd did not start");
1620 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1623 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1632 * Join consumer thread
1634 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1639 if (consumer_data
->pid
!= 0) {
1640 ret
= kill(consumer_data
->pid
, SIGTERM
);
1642 ERR("Error killing consumer daemon");
1645 return pthread_join(consumer_data
->thread
, &status
);
1652 * Fork and exec a consumer daemon (consumerd).
1654 * Return pid if successful else -1.
1656 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1660 const char *consumer_to_use
;
1661 const char *verbosity
;
1664 DBG("Spawning consumerd");
1671 if (opt_verbose_consumer
) {
1672 verbosity
= "--verbose";
1674 verbosity
= "--quiet";
1676 switch (consumer_data
->type
) {
1677 case LTTNG_CONSUMER_KERNEL
:
1679 * Find out which consumerd to execute. We will first try the
1680 * 64-bit path, then the sessiond's installation directory, and
1681 * fallback on the 32-bit one,
1683 DBG3("Looking for a kernel consumer at these locations:");
1684 DBG3(" 1) %s", consumerd64_bin
);
1685 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, CONSUMERD_FILE
);
1686 DBG3(" 3) %s", consumerd32_bin
);
1687 if (stat(consumerd64_bin
, &st
) == 0) {
1688 DBG3("Found location #1");
1689 consumer_to_use
= consumerd64_bin
;
1690 } else if (stat(INSTALL_BIN_PATH
"/" CONSUMERD_FILE
, &st
) == 0) {
1691 DBG3("Found location #2");
1692 consumer_to_use
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
1693 } else if (stat(consumerd32_bin
, &st
) == 0) {
1694 DBG3("Found location #3");
1695 consumer_to_use
= consumerd32_bin
;
1697 DBG("Could not find any valid consumerd executable");
1700 DBG("Using kernel consumer at: %s", consumer_to_use
);
1701 execl(consumer_to_use
,
1702 "lttng-consumerd", verbosity
, "-k",
1703 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1704 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1707 case LTTNG_CONSUMER64_UST
:
1709 char *tmpnew
= NULL
;
1711 if (consumerd64_libdir
[0] != '\0') {
1715 tmp
= getenv("LD_LIBRARY_PATH");
1719 tmplen
= strlen("LD_LIBRARY_PATH=")
1720 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
1721 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1726 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1727 strcat(tmpnew
, consumerd64_libdir
);
1728 if (tmp
[0] != '\0') {
1729 strcat(tmpnew
, ":");
1730 strcat(tmpnew
, tmp
);
1732 ret
= putenv(tmpnew
);
1738 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin
);
1739 ret
= execl(consumerd64_bin
, "lttng-consumerd", verbosity
, "-u",
1740 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1741 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1743 if (consumerd64_libdir
[0] != '\0') {
1751 case LTTNG_CONSUMER32_UST
:
1753 char *tmpnew
= NULL
;
1755 if (consumerd32_libdir
[0] != '\0') {
1759 tmp
= getenv("LD_LIBRARY_PATH");
1763 tmplen
= strlen("LD_LIBRARY_PATH=")
1764 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
1765 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1770 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1771 strcat(tmpnew
, consumerd32_libdir
);
1772 if (tmp
[0] != '\0') {
1773 strcat(tmpnew
, ":");
1774 strcat(tmpnew
, tmp
);
1776 ret
= putenv(tmpnew
);
1782 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin
);
1783 ret
= execl(consumerd32_bin
, "lttng-consumerd", verbosity
, "-u",
1784 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1785 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1787 if (consumerd32_libdir
[0] != '\0') {
1796 PERROR("unknown consumer type");
1800 PERROR("kernel start consumer exec");
1803 } else if (pid
> 0) {
1806 PERROR("start consumer fork");
1814 * Spawn the consumerd daemon and session daemon thread.
1816 static int start_consumerd(struct consumer_data
*consumer_data
)
1820 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1821 if (consumer_data
->pid
!= 0) {
1822 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1826 ret
= spawn_consumerd(consumer_data
);
1828 ERR("Spawning consumerd failed");
1829 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1833 /* Setting up the consumer_data pid */
1834 consumer_data
->pid
= ret
;
1835 DBG2("Consumer pid %d", consumer_data
->pid
);
1836 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1838 DBG2("Spawning consumer control thread");
1839 ret
= spawn_consumer_thread(consumer_data
);
1841 ERR("Fatal error spawning consumer control thread");
1853 * Check version of the lttng-modules.
1855 static int validate_lttng_modules_version(void)
1857 return kernel_validate_version(kernel_tracer_fd
);
1861 * Setup necessary data for kernel tracer action.
1863 static int init_kernel_tracer(void)
1867 /* Modprobe lttng kernel modules */
1868 ret
= modprobe_lttng_control();
1873 /* Open debugfs lttng */
1874 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
1875 if (kernel_tracer_fd
< 0) {
1876 DBG("Failed to open %s", module_proc_lttng
);
1881 /* Validate kernel version */
1882 ret
= validate_lttng_modules_version();
1887 ret
= modprobe_lttng_data();
1892 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1896 modprobe_remove_lttng_control();
1897 ret
= close(kernel_tracer_fd
);
1901 kernel_tracer_fd
= -1;
1902 return LTTCOMM_KERN_VERSION
;
1905 ret
= close(kernel_tracer_fd
);
1911 modprobe_remove_lttng_control();
1914 WARN("No kernel tracer available");
1915 kernel_tracer_fd
= -1;
1917 return LTTCOMM_NEED_ROOT_SESSIOND
;
1919 return LTTCOMM_KERN_NA
;
1924 * Init tracing by creating trace directory and sending fds kernel consumer.
1926 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
1930 if (session
->consumer_fds_sent
== 0) {
1932 * Assign default kernel consumer socket if no consumer assigned to the
1933 * kernel session. At this point, it's NOT supposed to be -1 but this is
1934 * an extra security check.
1936 if (session
->consumer_fd
< 0) {
1937 session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1940 ret
= send_kconsumer_session_streams(&kconsumer_data
, session
);
1942 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1946 session
->consumer_fds_sent
= 1;
1954 * Create an UST session and add it to the session ust list.
1956 static int create_ust_session(struct ltt_session
*session
,
1957 struct lttng_domain
*domain
)
1959 struct ltt_ust_session
*lus
= NULL
;
1962 switch (domain
->type
) {
1963 case LTTNG_DOMAIN_UST
:
1966 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1970 DBG("Creating UST session");
1972 lus
= trace_ust_create_session(session
->path
, session
->id
, domain
);
1974 ret
= LTTCOMM_UST_SESS_FAIL
;
1978 ret
= run_as_mkdir_recursive(lus
->pathname
, S_IRWXU
| S_IRWXG
,
1979 session
->uid
, session
->gid
);
1981 if (ret
!= -EEXIST
) {
1982 ERR("Trace directory creation error");
1983 ret
= LTTCOMM_UST_SESS_FAIL
;
1988 /* The domain type dictate different actions on session creation */
1989 switch (domain
->type
) {
1990 case LTTNG_DOMAIN_UST
:
1991 /* No ustctl for the global UST domain */
1994 ERR("Unknown UST domain on create session %d", domain
->type
);
1997 lus
->uid
= session
->uid
;
1998 lus
->gid
= session
->gid
;
1999 session
->ust_session
= lus
;
2009 * Create a kernel tracer session then create the default channel.
2011 static int create_kernel_session(struct ltt_session
*session
)
2015 DBG("Creating kernel session");
2017 ret
= kernel_create_session(session
, kernel_tracer_fd
);
2019 ret
= LTTCOMM_KERN_SESS_FAIL
;
2023 /* Set kernel consumer socket fd */
2024 if (kconsumer_data
.cmd_sock
>= 0) {
2025 session
->kernel_session
->consumer_fd
= kconsumer_data
.cmd_sock
;
2028 ret
= run_as_mkdir_recursive(session
->kernel_session
->trace_path
,
2029 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2031 if (ret
!= -EEXIST
) {
2032 ERR("Trace directory creation error");
2036 session
->kernel_session
->uid
= session
->uid
;
2037 session
->kernel_session
->gid
= session
->gid
;
2044 * Check if the UID or GID match the session. Root user has access to all
2047 static int session_access_ok(struct ltt_session
*session
, uid_t uid
, gid_t gid
)
2049 if (uid
!= session
->uid
&& gid
!= session
->gid
&& uid
!= 0) {
2056 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2059 struct ltt_session
*session
;
2061 DBG("Counting number of available session for UID %d GID %d",
2063 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2065 * Only list the sessions the user can control.
2067 if (!session_access_ok(session
, uid
, gid
)) {
2076 * Using the session list, filled a lttng_session array to send back to the
2077 * client for session listing.
2079 * The session list lock MUST be acquired before calling this function. Use
2080 * session_lock_list() and session_unlock_list().
2082 static void list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2086 struct ltt_session
*session
;
2088 DBG("Getting all available session for UID %d GID %d",
2091 * Iterate over session list and append data after the control struct in
2094 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2096 * Only list the sessions the user can control.
2098 if (!session_access_ok(session
, uid
, gid
)) {
2101 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
2102 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
2103 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2104 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2105 sessions
[i
].enabled
= session
->enabled
;
2111 * Fill lttng_channel array of all channels.
2113 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
2114 struct lttng_channel
*channels
)
2117 struct ltt_kernel_channel
*kchan
;
2119 DBG("Listing channels for session %s", session
->name
);
2122 case LTTNG_DOMAIN_KERNEL
:
2123 /* Kernel channels */
2124 if (session
->kernel_session
!= NULL
) {
2125 cds_list_for_each_entry(kchan
,
2126 &session
->kernel_session
->channel_list
.head
, list
) {
2127 /* Copy lttng_channel struct to array */
2128 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
2129 channels
[i
].enabled
= kchan
->enabled
;
2134 case LTTNG_DOMAIN_UST
:
2136 struct lttng_ht_iter iter
;
2137 struct ltt_ust_channel
*uchan
;
2139 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
2140 &iter
.iter
, uchan
, node
.node
) {
2141 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
2142 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
2143 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
2144 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
2145 channels
[i
].attr
.switch_timer_interval
=
2146 uchan
->attr
.switch_timer_interval
;
2147 channels
[i
].attr
.read_timer_interval
=
2148 uchan
->attr
.read_timer_interval
;
2149 channels
[i
].enabled
= uchan
->enabled
;
2150 switch (uchan
->attr
.output
) {
2151 case LTTNG_UST_MMAP
:
2153 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
2166 * Create a list of ust global domain events.
2168 static int list_lttng_ust_global_events(char *channel_name
,
2169 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
2172 unsigned int nb_event
= 0;
2173 struct lttng_ht_iter iter
;
2174 struct lttng_ht_node_str
*node
;
2175 struct ltt_ust_channel
*uchan
;
2176 struct ltt_ust_event
*uevent
;
2177 struct lttng_event
*tmp
;
2179 DBG("Listing UST global events for channel %s", channel_name
);
2183 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
2184 node
= lttng_ht_iter_get_node_str(&iter
);
2186 ret
= -LTTCOMM_UST_CHAN_NOT_FOUND
;
2190 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
2192 nb_event
+= lttng_ht_get_count(uchan
->events
);
2194 if (nb_event
== 0) {
2199 DBG3("Listing UST global %d events", nb_event
);
2201 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2203 ret
= -LTTCOMM_FATAL
;
2207 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
2208 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
2209 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2210 tmp
[i
].enabled
= uevent
->enabled
;
2211 switch (uevent
->attr
.instrumentation
) {
2212 case LTTNG_UST_TRACEPOINT
:
2213 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2215 case LTTNG_UST_PROBE
:
2216 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
2218 case LTTNG_UST_FUNCTION
:
2219 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
2222 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
2223 switch (uevent
->attr
.loglevel_type
) {
2224 case LTTNG_UST_LOGLEVEL_ALL
:
2225 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
2227 case LTTNG_UST_LOGLEVEL_RANGE
:
2228 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
2230 case LTTNG_UST_LOGLEVEL_SINGLE
:
2231 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
2246 * Fill lttng_event array of all kernel events in the channel.
2248 static int list_lttng_kernel_events(char *channel_name
,
2249 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
2252 unsigned int nb_event
;
2253 struct ltt_kernel_event
*event
;
2254 struct ltt_kernel_channel
*kchan
;
2256 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
2257 if (kchan
== NULL
) {
2258 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2262 nb_event
= kchan
->event_count
;
2264 DBG("Listing events for channel %s", kchan
->channel
->name
);
2266 if (nb_event
== 0) {
2271 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2272 if (*events
== NULL
) {
2273 ret
= LTTCOMM_FATAL
;
2277 /* Kernel channels */
2278 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
2279 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
2280 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2281 (*events
)[i
].enabled
= event
->enabled
;
2282 switch (event
->event
->instrumentation
) {
2283 case LTTNG_KERNEL_TRACEPOINT
:
2284 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2286 case LTTNG_KERNEL_KPROBE
:
2287 case LTTNG_KERNEL_KRETPROBE
:
2288 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
2289 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
2290 sizeof(struct lttng_kernel_kprobe
));
2292 case LTTNG_KERNEL_FUNCTION
:
2293 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
2294 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
2295 sizeof(struct lttng_kernel_function
));
2297 case LTTNG_KERNEL_NOOP
:
2298 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
2300 case LTTNG_KERNEL_SYSCALL
:
2301 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
2303 case LTTNG_KERNEL_ALL
:
2317 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2319 static int cmd_disable_channel(struct ltt_session
*session
,
2320 int domain
, char *channel_name
)
2323 struct ltt_ust_session
*usess
;
2325 usess
= session
->ust_session
;
2328 case LTTNG_DOMAIN_KERNEL
:
2330 ret
= channel_kernel_disable(session
->kernel_session
,
2332 if (ret
!= LTTCOMM_OK
) {
2336 kernel_wait_quiescent(kernel_tracer_fd
);
2339 case LTTNG_DOMAIN_UST
:
2341 struct ltt_ust_channel
*uchan
;
2342 struct lttng_ht
*chan_ht
;
2344 chan_ht
= usess
->domain_global
.channels
;
2346 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
2347 if (uchan
== NULL
) {
2348 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2352 ret
= channel_ust_disable(usess
, domain
, uchan
);
2353 if (ret
!= LTTCOMM_OK
) {
2359 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2360 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2361 case LTTNG_DOMAIN_UST_PID
:
2364 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2375 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2377 static int cmd_enable_channel(struct ltt_session
*session
,
2378 int domain
, struct lttng_channel
*attr
)
2381 struct ltt_ust_session
*usess
= session
->ust_session
;
2382 struct lttng_ht
*chan_ht
;
2384 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
2387 case LTTNG_DOMAIN_KERNEL
:
2389 struct ltt_kernel_channel
*kchan
;
2391 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
2392 session
->kernel_session
);
2393 if (kchan
== NULL
) {
2394 ret
= channel_kernel_create(session
->kernel_session
,
2395 attr
, kernel_poll_pipe
[1]);
2397 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
2400 if (ret
!= LTTCOMM_OK
) {
2404 kernel_wait_quiescent(kernel_tracer_fd
);
2407 case LTTNG_DOMAIN_UST
:
2409 struct ltt_ust_channel
*uchan
;
2411 chan_ht
= usess
->domain_global
.channels
;
2413 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
2414 if (uchan
== NULL
) {
2415 ret
= channel_ust_create(usess
, domain
, attr
);
2417 ret
= channel_ust_enable(usess
, domain
, uchan
);
2422 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2423 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2424 case LTTNG_DOMAIN_UST_PID
:
2427 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2436 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2438 static int cmd_disable_event(struct ltt_session
*session
, int domain
,
2439 char *channel_name
, char *event_name
)
2444 case LTTNG_DOMAIN_KERNEL
:
2446 struct ltt_kernel_channel
*kchan
;
2447 struct ltt_kernel_session
*ksess
;
2449 ksess
= session
->kernel_session
;
2451 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2452 if (kchan
== NULL
) {
2453 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2457 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
2458 if (ret
!= LTTCOMM_OK
) {
2462 kernel_wait_quiescent(kernel_tracer_fd
);
2465 case LTTNG_DOMAIN_UST
:
2467 struct ltt_ust_channel
*uchan
;
2468 struct ltt_ust_session
*usess
;
2470 usess
= session
->ust_session
;
2472 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2474 if (uchan
== NULL
) {
2475 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2479 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
2480 if (ret
!= LTTCOMM_OK
) {
2484 DBG3("Disable UST event %s in channel %s completed", event_name
,
2489 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2490 case LTTNG_DOMAIN_UST_PID
:
2491 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2505 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2507 static int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
2513 case LTTNG_DOMAIN_KERNEL
:
2515 struct ltt_kernel_session
*ksess
;
2516 struct ltt_kernel_channel
*kchan
;
2518 ksess
= session
->kernel_session
;
2520 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2521 if (kchan
== NULL
) {
2522 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2526 ret
= event_kernel_disable_all(ksess
, kchan
);
2527 if (ret
!= LTTCOMM_OK
) {
2531 kernel_wait_quiescent(kernel_tracer_fd
);
2534 case LTTNG_DOMAIN_UST
:
2536 struct ltt_ust_session
*usess
;
2537 struct ltt_ust_channel
*uchan
;
2539 usess
= session
->ust_session
;
2541 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2543 if (uchan
== NULL
) {
2544 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2548 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
2553 DBG3("Disable all UST events in channel %s completed", channel_name
);
2558 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2559 case LTTNG_DOMAIN_UST_PID
:
2560 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2574 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2576 static int cmd_add_context(struct ltt_session
*session
, int domain
,
2577 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
2582 case LTTNG_DOMAIN_KERNEL
:
2583 /* Add kernel context to kernel tracer */
2584 ret
= context_kernel_add(session
->kernel_session
, ctx
,
2585 event_name
, channel_name
);
2586 if (ret
!= LTTCOMM_OK
) {
2590 case LTTNG_DOMAIN_UST
:
2592 struct ltt_ust_session
*usess
= session
->ust_session
;
2594 ret
= context_ust_add(usess
, domain
, ctx
, event_name
, channel_name
);
2595 if (ret
!= LTTCOMM_OK
) {
2601 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2602 case LTTNG_DOMAIN_UST_PID
:
2603 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2617 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2619 static int cmd_enable_event(struct ltt_session
*session
, int domain
,
2620 char *channel_name
, struct lttng_event
*event
)
2623 struct lttng_channel
*attr
;
2624 struct ltt_ust_session
*usess
= session
->ust_session
;
2627 case LTTNG_DOMAIN_KERNEL
:
2629 struct ltt_kernel_channel
*kchan
;
2631 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2632 session
->kernel_session
);
2633 if (kchan
== NULL
) {
2634 attr
= channel_new_default_attr(domain
);
2636 ret
= LTTCOMM_FATAL
;
2639 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2641 /* This call will notify the kernel thread */
2642 ret
= channel_kernel_create(session
->kernel_session
,
2643 attr
, kernel_poll_pipe
[1]);
2644 if (ret
!= LTTCOMM_OK
) {
2651 /* Get the newly created kernel channel pointer */
2652 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2653 session
->kernel_session
);
2654 if (kchan
== NULL
) {
2655 /* This sould not happen... */
2656 ret
= LTTCOMM_FATAL
;
2660 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
2662 if (ret
!= LTTCOMM_OK
) {
2666 kernel_wait_quiescent(kernel_tracer_fd
);
2669 case LTTNG_DOMAIN_UST
:
2671 struct lttng_channel
*attr
;
2672 struct ltt_ust_channel
*uchan
;
2674 /* Get channel from global UST domain */
2675 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2677 if (uchan
== NULL
) {
2678 /* Create default channel */
2679 attr
= channel_new_default_attr(domain
);
2681 ret
= LTTCOMM_FATAL
;
2684 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2685 attr
->name
[NAME_MAX
- 1] = '\0';
2687 ret
= channel_ust_create(usess
, domain
, attr
);
2688 if (ret
!= LTTCOMM_OK
) {
2694 /* Get the newly created channel reference back */
2695 uchan
= trace_ust_find_channel_by_name(
2696 usess
->domain_global
.channels
, channel_name
);
2697 if (uchan
== NULL
) {
2698 /* Something is really wrong */
2699 ret
= LTTCOMM_FATAL
;
2704 /* At this point, the session and channel exist on the tracer */
2705 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
);
2706 if (ret
!= LTTCOMM_OK
) {
2712 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2713 case LTTNG_DOMAIN_UST_PID
:
2714 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2728 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2730 static int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
2731 char *channel_name
, int event_type
)
2734 struct ltt_kernel_channel
*kchan
;
2737 case LTTNG_DOMAIN_KERNEL
:
2738 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2739 session
->kernel_session
);
2740 if (kchan
== NULL
) {
2741 /* This call will notify the kernel thread */
2742 ret
= channel_kernel_create(session
->kernel_session
, NULL
,
2743 kernel_poll_pipe
[1]);
2744 if (ret
!= LTTCOMM_OK
) {
2748 /* Get the newly created kernel channel pointer */
2749 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2750 session
->kernel_session
);
2751 if (kchan
== NULL
) {
2752 /* This sould not happen... */
2753 ret
= LTTCOMM_FATAL
;
2759 switch (event_type
) {
2760 case LTTNG_EVENT_SYSCALL
:
2761 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
2762 kchan
, kernel_tracer_fd
);
2764 case LTTNG_EVENT_TRACEPOINT
:
2766 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2767 * events already registered to the channel.
2769 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
2770 kchan
, kernel_tracer_fd
);
2772 case LTTNG_EVENT_ALL
:
2773 /* Enable syscalls and tracepoints */
2774 ret
= event_kernel_enable_all(session
->kernel_session
,
2775 kchan
, kernel_tracer_fd
);
2778 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2782 /* Manage return value */
2783 if (ret
!= LTTCOMM_OK
) {
2787 kernel_wait_quiescent(kernel_tracer_fd
);
2789 case LTTNG_DOMAIN_UST
:
2791 struct lttng_channel
*attr
;
2792 struct ltt_ust_channel
*uchan
;
2793 struct ltt_ust_session
*usess
= session
->ust_session
;
2795 /* Get channel from global UST domain */
2796 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2798 if (uchan
== NULL
) {
2799 /* Create default channel */
2800 attr
= channel_new_default_attr(domain
);
2802 ret
= LTTCOMM_FATAL
;
2805 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2806 attr
->name
[NAME_MAX
- 1] = '\0';
2808 /* Use the internal command enable channel */
2809 ret
= channel_ust_create(usess
, domain
, attr
);
2810 if (ret
!= LTTCOMM_OK
) {
2816 /* Get the newly created channel reference back */
2817 uchan
= trace_ust_find_channel_by_name(
2818 usess
->domain_global
.channels
, channel_name
);
2819 if (uchan
== NULL
) {
2820 /* Something is really wrong */
2821 ret
= LTTCOMM_FATAL
;
2826 /* At this point, the session and channel exist on the tracer */
2828 switch (event_type
) {
2829 case LTTNG_EVENT_ALL
:
2830 case LTTNG_EVENT_TRACEPOINT
:
2831 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
);
2832 if (ret
!= LTTCOMM_OK
) {
2837 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2841 /* Manage return value */
2842 if (ret
!= LTTCOMM_OK
) {
2849 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2850 case LTTNG_DOMAIN_UST_PID
:
2851 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2865 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2867 static ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
2870 ssize_t nb_events
= 0;
2873 case LTTNG_DOMAIN_KERNEL
:
2874 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2875 if (nb_events
< 0) {
2876 ret
= LTTCOMM_KERN_LIST_FAIL
;
2880 case LTTNG_DOMAIN_UST
:
2881 nb_events
= ust_app_list_events(events
);
2882 if (nb_events
< 0) {
2883 ret
= LTTCOMM_UST_LIST_FAIL
;
2895 /* Return negative value to differentiate return code */
2900 * Command LTTNG_START_TRACE processed by the client thread.
2902 static int cmd_start_trace(struct ltt_session
*session
)
2905 struct ltt_kernel_session
*ksession
;
2906 struct ltt_ust_session
*usess
;
2909 ksession
= session
->kernel_session
;
2910 usess
= session
->ust_session
;
2912 if (session
->enabled
) {
2913 /* Already started. */
2914 ret
= LTTCOMM_TRACE_ALREADY_STARTED
;
2918 session
->enabled
= 1;
2920 /* Kernel tracing */
2921 if (ksession
!= NULL
) {
2922 struct ltt_kernel_channel
*kchan
;
2924 /* Open kernel metadata */
2925 if (ksession
->metadata
== NULL
) {
2926 ret
= kernel_open_metadata(ksession
, ksession
->trace_path
);
2928 ret
= LTTCOMM_KERN_META_FAIL
;
2933 /* Open kernel metadata stream */
2934 if (ksession
->metadata_stream_fd
< 0) {
2935 ret
= kernel_open_metadata_stream(ksession
);
2937 ERR("Kernel create metadata stream failed");
2938 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2943 /* For each channel */
2944 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2945 if (kchan
->stream_count
== 0) {
2946 ret
= kernel_open_channel_stream(kchan
);
2948 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2951 /* Update the stream global counter */
2952 ksession
->stream_count_global
+= ret
;
2956 /* Setup kernel consumer socket and send fds to it */
2957 ret
= init_kernel_tracing(ksession
);
2959 ret
= LTTCOMM_KERN_START_FAIL
;
2963 /* This start the kernel tracing */
2964 ret
= kernel_start_session(ksession
);
2966 ret
= LTTCOMM_KERN_START_FAIL
;
2970 /* Quiescent wait after starting trace */
2971 kernel_wait_quiescent(kernel_tracer_fd
);
2974 /* Flag session that trace should start automatically */
2976 usess
->start_trace
= 1;
2978 ret
= ust_app_start_trace_all(usess
);
2980 ret
= LTTCOMM_UST_START_FAIL
;
2992 * Command LTTNG_STOP_TRACE processed by the client thread.
2994 static int cmd_stop_trace(struct ltt_session
*session
)
2997 struct ltt_kernel_channel
*kchan
;
2998 struct ltt_kernel_session
*ksession
;
2999 struct ltt_ust_session
*usess
;
3002 ksession
= session
->kernel_session
;
3003 usess
= session
->ust_session
;
3005 if (!session
->enabled
) {
3006 ret
= LTTCOMM_TRACE_ALREADY_STOPPED
;
3010 session
->enabled
= 0;
3013 if (ksession
!= NULL
) {
3014 DBG("Stop kernel tracing");
3016 /* Flush all buffers before stopping */
3017 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
3019 ERR("Kernel metadata flush failed");
3022 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
3023 ret
= kernel_flush_buffer(kchan
);
3025 ERR("Kernel flush buffer error");
3029 ret
= kernel_stop_session(ksession
);
3031 ret
= LTTCOMM_KERN_STOP_FAIL
;
3035 kernel_wait_quiescent(kernel_tracer_fd
);
3039 usess
->start_trace
= 0;
3041 ret
= ust_app_stop_trace_all(usess
);
3043 ret
= LTTCOMM_UST_STOP_FAIL
;
3055 * Command LTTNG_CREATE_SESSION processed by the client thread.
3057 static int cmd_create_session(char *name
, char *path
, lttng_sock_cred
*creds
)
3061 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
3062 LTTNG_SOCK_GET_GID_CRED(creds
));
3063 if (ret
!= LTTCOMM_OK
) {
3074 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3076 static int cmd_destroy_session(struct ltt_session
*session
, char *name
)
3080 /* Clean kernel session teardown */
3081 teardown_kernel_session(session
);
3082 /* UST session teardown */
3083 teardown_ust_session(session
);
3086 * Must notify the kernel thread here to update it's poll setin order
3087 * to remove the channel(s)' fd just destroyed.
3089 ret
= notify_thread_pipe(kernel_poll_pipe
[1]);
3091 PERROR("write kernel poll pipe");
3094 ret
= session_destroy(session
);
3100 * Command LTTNG_CALIBRATE processed by the client thread.
3102 static int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
3107 case LTTNG_DOMAIN_KERNEL
:
3109 struct lttng_kernel_calibrate kcalibrate
;
3111 kcalibrate
.type
= calibrate
->type
;
3112 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
3114 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
3119 case LTTNG_DOMAIN_UST
:
3121 struct lttng_ust_calibrate ucalibrate
;
3123 ucalibrate
.type
= calibrate
->type
;
3124 ret
= ust_app_calibrate_glb(&ucalibrate
);
3126 ret
= LTTCOMM_UST_CALIBRATE_FAIL
;
3143 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3145 static int cmd_register_consumer(struct ltt_session
*session
, int domain
,
3151 case LTTNG_DOMAIN_KERNEL
:
3152 /* Can't register a consumer if there is already one */
3153 if (session
->kernel_session
->consumer_fds_sent
!= 0) {
3154 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3158 sock
= lttcomm_connect_unix_sock(sock_path
);
3160 ret
= LTTCOMM_CONNECT_FAIL
;
3164 session
->kernel_session
->consumer_fd
= sock
;
3167 /* TODO: Userspace tracing */
3179 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3181 static ssize_t
cmd_list_domains(struct ltt_session
*session
,
3182 struct lttng_domain
**domains
)
3187 if (session
->kernel_session
!= NULL
) {
3188 DBG3("Listing domains found kernel domain");
3192 if (session
->ust_session
!= NULL
) {
3193 DBG3("Listing domains found UST global domain");
3197 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
3198 if (*domains
== NULL
) {
3199 ret
= -LTTCOMM_FATAL
;
3203 if (session
->kernel_session
!= NULL
) {
3204 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
3208 if (session
->ust_session
!= NULL
) {
3209 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
3220 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3222 static ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
3223 struct lttng_channel
**channels
)
3226 ssize_t nb_chan
= 0;
3229 case LTTNG_DOMAIN_KERNEL
:
3230 if (session
->kernel_session
!= NULL
) {
3231 nb_chan
= session
->kernel_session
->channel_count
;
3233 DBG3("Number of kernel channels %zd", nb_chan
);
3235 case LTTNG_DOMAIN_UST
:
3236 if (session
->ust_session
!= NULL
) {
3237 nb_chan
= lttng_ht_get_count(
3238 session
->ust_session
->domain_global
.channels
);
3240 DBG3("Number of UST global channels %zd", nb_chan
);
3249 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
3250 if (*channels
== NULL
) {
3251 ret
= -LTTCOMM_FATAL
;
3255 list_lttng_channels(domain
, session
, *channels
);
3267 * Command LTTNG_LIST_EVENTS processed by the client thread.
3269 static ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
3270 char *channel_name
, struct lttng_event
**events
)
3273 ssize_t nb_event
= 0;
3276 case LTTNG_DOMAIN_KERNEL
:
3277 if (session
->kernel_session
!= NULL
) {
3278 nb_event
= list_lttng_kernel_events(channel_name
,
3279 session
->kernel_session
, events
);
3282 case LTTNG_DOMAIN_UST
:
3284 if (session
->ust_session
!= NULL
) {
3285 nb_event
= list_lttng_ust_global_events(channel_name
,
3286 &session
->ust_session
->domain_global
, events
);
3302 * Process the command requested by the lttng client within the command
3303 * context structure. This function make sure that the return structure (llm)
3304 * is set and ready for transmission before returning.
3306 * Return any error encountered or 0 for success.
3308 static int process_client_msg(struct command_ctx
*cmd_ctx
)
3310 int ret
= LTTCOMM_OK
;
3311 int need_tracing_session
= 1;
3314 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
3316 switch (cmd_ctx
->lsm
->cmd_type
) {
3317 case LTTNG_CREATE_SESSION
:
3318 case LTTNG_DESTROY_SESSION
:
3319 case LTTNG_LIST_SESSIONS
:
3320 case LTTNG_LIST_DOMAINS
:
3321 case LTTNG_START_TRACE
:
3322 case LTTNG_STOP_TRACE
:
3329 if (opt_no_kernel
&& need_domain
3330 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
3332 ret
= LTTCOMM_NEED_ROOT_SESSIOND
;
3334 ret
= LTTCOMM_KERN_NA
;
3340 * Check for command that don't needs to allocate a returned payload. We do
3341 * this here so we don't have to make the call for no payload at each
3344 switch(cmd_ctx
->lsm
->cmd_type
) {
3345 case LTTNG_LIST_SESSIONS
:
3346 case LTTNG_LIST_TRACEPOINTS
:
3347 case LTTNG_LIST_DOMAINS
:
3348 case LTTNG_LIST_CHANNELS
:
3349 case LTTNG_LIST_EVENTS
:
3352 /* Setup lttng message with no payload */
3353 ret
= setup_lttng_msg(cmd_ctx
, 0);
3355 /* This label does not try to unlock the session */
3356 goto init_setup_error
;
3360 /* Commands that DO NOT need a session. */
3361 switch (cmd_ctx
->lsm
->cmd_type
) {
3362 case LTTNG_CREATE_SESSION
:
3363 case LTTNG_CALIBRATE
:
3364 case LTTNG_LIST_SESSIONS
:
3365 case LTTNG_LIST_TRACEPOINTS
:
3366 need_tracing_session
= 0;
3369 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
3370 session_lock_list();
3371 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
3372 session_unlock_list();
3373 if (cmd_ctx
->session
== NULL
) {
3374 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
3375 ret
= LTTCOMM_SESS_NOT_FOUND
;
3377 /* If no session name specified */
3378 ret
= LTTCOMM_SELECT_SESS
;
3382 /* Acquire lock for the session */
3383 session_lock(cmd_ctx
->session
);
3392 * Check domain type for specific "pre-action".
3394 switch (cmd_ctx
->lsm
->domain
.type
) {
3395 case LTTNG_DOMAIN_KERNEL
:
3397 ret
= LTTCOMM_NEED_ROOT_SESSIOND
;
3401 /* Kernel tracer check */
3402 if (kernel_tracer_fd
== -1) {
3403 /* Basically, load kernel tracer modules */
3404 ret
= init_kernel_tracer();
3410 /* Need a session for kernel command */
3411 if (need_tracing_session
) {
3412 if (cmd_ctx
->session
->kernel_session
== NULL
) {
3413 ret
= create_kernel_session(cmd_ctx
->session
);
3415 ret
= LTTCOMM_KERN_SESS_FAIL
;
3420 /* Start the kernel consumer daemon */
3421 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3422 if (kconsumer_data
.pid
== 0 &&
3423 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3424 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3425 ret
= start_consumerd(&kconsumer_data
);
3427 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3431 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3435 case LTTNG_DOMAIN_UST
:
3437 if (need_tracing_session
) {
3438 if (cmd_ctx
->session
->ust_session
== NULL
) {
3439 ret
= create_ust_session(cmd_ctx
->session
,
3440 &cmd_ctx
->lsm
->domain
);
3441 if (ret
!= LTTCOMM_OK
) {
3445 /* Start the UST consumer daemons */
3447 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
3448 if (consumerd64_bin
[0] != '\0' &&
3449 ustconsumer64_data
.pid
== 0 &&
3450 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3451 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3452 ret
= start_consumerd(&ustconsumer64_data
);
3454 ret
= LTTCOMM_UST_CONSUMER64_FAIL
;
3455 ust_consumerd64_fd
= -EINVAL
;
3459 ust_consumerd64_fd
= ustconsumer64_data
.cmd_sock
;
3461 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3464 if (consumerd32_bin
[0] != '\0' &&
3465 ustconsumer32_data
.pid
== 0 &&
3466 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3467 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3468 ret
= start_consumerd(&ustconsumer32_data
);
3470 ret
= LTTCOMM_UST_CONSUMER32_FAIL
;
3471 ust_consumerd32_fd
= -EINVAL
;
3474 ust_consumerd32_fd
= ustconsumer32_data
.cmd_sock
;
3476 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3487 * Check that the UID or GID match that of the tracing session.
3488 * The root user can interact with all sessions.
3490 if (need_tracing_session
) {
3491 if (!session_access_ok(cmd_ctx
->session
,
3492 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3493 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
3494 ret
= LTTCOMM_EPERM
;
3499 /* Process by command type */
3500 switch (cmd_ctx
->lsm
->cmd_type
) {
3501 case LTTNG_ADD_CONTEXT
:
3503 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3504 cmd_ctx
->lsm
->u
.context
.channel_name
,
3505 cmd_ctx
->lsm
->u
.context
.event_name
,
3506 &cmd_ctx
->lsm
->u
.context
.ctx
);
3509 case LTTNG_DISABLE_CHANNEL
:
3511 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3512 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3515 case LTTNG_DISABLE_EVENT
:
3517 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3518 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3519 cmd_ctx
->lsm
->u
.disable
.name
);
3522 case LTTNG_DISABLE_ALL_EVENT
:
3524 DBG("Disabling all events");
3526 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3527 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3530 case LTTNG_ENABLE_CHANNEL
:
3532 ret
= cmd_enable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3533 &cmd_ctx
->lsm
->u
.channel
.chan
);
3536 case LTTNG_ENABLE_EVENT
:
3538 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3539 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3540 &cmd_ctx
->lsm
->u
.enable
.event
);
3543 case LTTNG_ENABLE_ALL_EVENT
:
3545 DBG("Enabling all events");
3547 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3548 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3549 cmd_ctx
->lsm
->u
.enable
.event
.type
);
3552 case LTTNG_LIST_TRACEPOINTS
:
3554 struct lttng_event
*events
;
3557 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3558 if (nb_events
< 0) {
3564 * Setup lttng message with payload size set to the event list size in
3565 * bytes and then copy list into the llm payload.
3567 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3573 /* Copy event list into message payload */
3574 memcpy(cmd_ctx
->llm
->payload
, events
,
3575 sizeof(struct lttng_event
) * nb_events
);
3582 case LTTNG_START_TRACE
:
3584 ret
= cmd_start_trace(cmd_ctx
->session
);
3587 case LTTNG_STOP_TRACE
:
3589 ret
= cmd_stop_trace(cmd_ctx
->session
);
3592 case LTTNG_CREATE_SESSION
:
3594 tracepoint(create_session_start
);
3595 ret
= cmd_create_session(cmd_ctx
->lsm
->session
.name
,
3596 cmd_ctx
->lsm
->session
.path
, &cmd_ctx
->creds
);
3597 tracepoint(create_session_end
);
3600 case LTTNG_DESTROY_SESSION
:
3602 tracepoint(destroy_session_start
);
3603 ret
= cmd_destroy_session(cmd_ctx
->session
,
3604 cmd_ctx
->lsm
->session
.name
);
3605 tracepoint(destroy_session_end
);
3608 case LTTNG_LIST_DOMAINS
:
3611 struct lttng_domain
*domains
;
3613 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3619 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3624 /* Copy event list into message payload */
3625 memcpy(cmd_ctx
->llm
->payload
, domains
,
3626 nb_dom
* sizeof(struct lttng_domain
));
3633 case LTTNG_LIST_CHANNELS
:
3636 struct lttng_channel
*channels
;
3638 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3639 cmd_ctx
->session
, &channels
);
3645 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3650 /* Copy event list into message payload */
3651 memcpy(cmd_ctx
->llm
->payload
, channels
,
3652 nb_chan
* sizeof(struct lttng_channel
));
3659 case LTTNG_LIST_EVENTS
:
3662 struct lttng_event
*events
= NULL
;
3664 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3665 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3671 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3676 /* Copy event list into message payload */
3677 memcpy(cmd_ctx
->llm
->payload
, events
,
3678 nb_event
* sizeof(struct lttng_event
));
3685 case LTTNG_LIST_SESSIONS
:
3687 unsigned int nr_sessions
;
3689 session_lock_list();
3690 nr_sessions
= lttng_sessions_count(
3691 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3692 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3694 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) * nr_sessions
);
3696 session_unlock_list();
3700 /* Filled the session array */
3701 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
),
3702 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3703 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3705 session_unlock_list();
3710 case LTTNG_CALIBRATE
:
3712 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3713 &cmd_ctx
->lsm
->u
.calibrate
);
3716 case LTTNG_REGISTER_CONSUMER
:
3718 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3719 cmd_ctx
->lsm
->u
.reg
.path
);
3728 if (cmd_ctx
->llm
== NULL
) {
3729 DBG("Missing llm structure. Allocating one.");
3730 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3734 /* Set return code */
3735 cmd_ctx
->llm
->ret_code
= ret
;
3737 if (cmd_ctx
->session
) {
3738 session_unlock(cmd_ctx
->session
);
3745 * This thread manage all clients request using the unix client socket for
3748 static void *thread_manage_clients(void *data
)
3750 int sock
= -1, ret
, i
, pollfd
;
3751 uint32_t revents
, nb_fd
;
3752 struct command_ctx
*cmd_ctx
= NULL
;
3753 struct lttng_poll_event events
;
3755 tracepoint(sessiond_th_cli_start
);
3757 DBG("[thread] Manage client started");
3759 rcu_register_thread();
3761 ret
= lttcomm_listen_unix_sock(client_sock
);
3767 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3768 * more will be added to this poll set.
3770 ret
= create_thread_poll_set(&events
, 2);
3775 /* Add the application registration socket */
3776 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3782 * Notify parent pid that we are ready to accept command for client side.
3784 if (opt_sig_parent
) {
3785 kill(ppid
, SIGUSR1
);
3789 DBG("Accepting client command ...");
3791 tracepoint(sessiond_th_cli_poll
);
3793 nb_fd
= LTTNG_POLL_GETNB(&events
);
3795 /* Inifinite blocking call, waiting for transmission */
3797 ret
= lttng_poll_wait(&events
, -1);
3800 * Restart interrupted system call.
3802 if (errno
== EINTR
) {
3808 for (i
= 0; i
< nb_fd
; i
++) {
3809 /* Fetch once the poll data */
3810 revents
= LTTNG_POLL_GETEV(&events
, i
);
3811 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3813 /* Thread quit pipe has been closed. Killing thread. */
3814 ret
= check_thread_quit_pipe(pollfd
, revents
);
3819 /* Event on the registration socket */
3820 if (pollfd
== client_sock
) {
3821 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3822 ERR("Client socket poll error");
3828 DBG("Wait for client response");
3830 sock
= lttcomm_accept_unix_sock(client_sock
);
3835 /* Set socket option for credentials retrieval */
3836 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
3841 /* Allocate context command to process the client request */
3842 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3843 if (cmd_ctx
== NULL
) {
3844 PERROR("zmalloc cmd_ctx");
3848 /* Allocate data buffer for reception */
3849 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3850 if (cmd_ctx
->lsm
== NULL
) {
3851 PERROR("zmalloc cmd_ctx->lsm");
3855 cmd_ctx
->llm
= NULL
;
3856 cmd_ctx
->session
= NULL
;
3859 * Data is received from the lttng client. The struct
3860 * lttcomm_session_msg (lsm) contains the command and data request of
3863 DBG("Receiving data from client ...");
3864 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
3865 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
3867 DBG("Nothing recv() from client... continuing");
3877 // TODO: Validate cmd_ctx including sanity check for
3878 // security purpose.
3880 rcu_thread_online();
3882 * This function dispatch the work to the kernel or userspace tracer
3883 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3884 * informations for the client. The command context struct contains
3885 * everything this function may needs.
3887 ret
= process_client_msg(cmd_ctx
);
3888 rcu_thread_offline();
3891 * TODO: Inform client somehow of the fatal error. At
3892 * this point, ret < 0 means that a zmalloc failed
3893 * (ENOMEM). Error detected but still accept command.
3895 clean_command_ctx(&cmd_ctx
);
3899 DBG("Sending response (size: %d, retcode: %s)",
3900 cmd_ctx
->lttng_msg_size
,
3901 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3902 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3904 ERR("Failed to send data back to client");
3907 /* End of transmission */
3914 clean_command_ctx(&cmd_ctx
);
3918 DBG("Client thread dying");
3919 unlink(client_unix_sock_path
);
3920 if (client_sock
>= 0) {
3921 ret
= close(client_sock
);
3933 lttng_poll_clean(&events
);
3934 clean_command_ctx(&cmd_ctx
);
3936 rcu_unregister_thread();
3942 * usage function on stderr
3944 static void usage(void)
3946 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3947 fprintf(stderr
, " -h, --help Display this usage.\n");
3948 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3949 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3950 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3951 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3952 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3953 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3954 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3955 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3956 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3957 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3958 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3959 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3960 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3961 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3962 fprintf(stderr
, " -V, --version Show version number.\n");
3963 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3964 fprintf(stderr
, " -q, --quiet No output at all.\n");
3965 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3966 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3967 fprintf(stderr
, " --no-kernel Disable kernel tracer\n");
3971 * daemon argument parsing
3973 static int parse_args(int argc
, char **argv
)
3977 static struct option long_options
[] = {
3978 { "client-sock", 1, 0, 'c' },
3979 { "apps-sock", 1, 0, 'a' },
3980 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3981 { "kconsumerd-err-sock", 1, 0, 'E' },
3982 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3983 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3984 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3985 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3986 { "consumerd32-path", 1, 0, 'u' },
3987 { "consumerd32-libdir", 1, 0, 'U' },
3988 { "consumerd64-path", 1, 0, 't' },
3989 { "consumerd64-libdir", 1, 0, 'T' },
3990 { "daemonize", 0, 0, 'd' },
3991 { "sig-parent", 0, 0, 'S' },
3992 { "help", 0, 0, 'h' },
3993 { "group", 1, 0, 'g' },
3994 { "version", 0, 0, 'V' },
3995 { "quiet", 0, 0, 'q' },
3996 { "verbose", 0, 0, 'v' },
3997 { "verbose-consumer", 0, 0, 'Z' },
3998 { "no-kernel", 0, 0, 'N' },
4003 int option_index
= 0;
4004 c
= getopt_long(argc
, argv
, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
4005 long_options
, &option_index
);
4012 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
4014 fprintf(stderr
, " with arg %s\n", optarg
);
4018 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4021 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4027 opt_tracing_group
= optarg
;
4033 fprintf(stdout
, "%s\n", VERSION
);
4039 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4042 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4045 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4048 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4051 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4054 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4060 lttng_opt_quiet
= 1;
4063 /* Verbose level can increase using multiple -v */
4064 lttng_opt_verbose
+= 1;
4067 opt_verbose_consumer
+= 1;
4070 consumerd32_bin
= optarg
;
4073 consumerd32_libdir
= optarg
;
4076 consumerd64_bin
= optarg
;
4079 consumerd64_libdir
= optarg
;
4082 /* Unknown option or other error.
4083 * Error is printed by getopt, just return */
4092 * Creates the two needed socket by the daemon.
4093 * apps_sock - The communication socket for all UST apps.
4094 * client_sock - The communication of the cli tool (lttng).
4096 static int init_daemon_socket(void)
4101 old_umask
= umask(0);
4103 /* Create client tool unix socket */
4104 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
4105 if (client_sock
< 0) {
4106 ERR("Create unix sock failed: %s", client_unix_sock_path
);
4111 /* File permission MUST be 660 */
4112 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4114 ERR("Set file permissions failed: %s", client_unix_sock_path
);
4119 /* Create the application unix socket */
4120 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
4121 if (apps_sock
< 0) {
4122 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
4127 /* File permission MUST be 666 */
4128 ret
= chmod(apps_unix_sock_path
,
4129 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
4131 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
4142 * Check if the global socket is available, and if a daemon is answering at the
4143 * other side. If yes, error is returned.
4145 static int check_existing_daemon(void)
4147 /* Is there anybody out there ? */
4148 if (lttng_session_daemon_alive()) {
4156 * Set the tracing group gid onto the client socket.
4158 * Race window between mkdir and chown is OK because we are going from more
4159 * permissive (root.root) to less permissive (root.tracing).
4161 static int set_permissions(char *rundir
)
4166 gid
= allowed_group();
4168 WARN("No tracing group detected");
4173 /* Set lttng run dir */
4174 ret
= chown(rundir
, 0, gid
);
4176 ERR("Unable to set group on %s", rundir
);
4180 /* Ensure tracing group can search the run dir */
4181 ret
= chmod(rundir
, S_IRWXU
| S_IXGRP
| S_IXOTH
);
4183 ERR("Unable to set permissions on %s", rundir
);
4187 /* lttng client socket path */
4188 ret
= chown(client_unix_sock_path
, 0, gid
);
4190 ERR("Unable to set group on %s", client_unix_sock_path
);
4194 /* kconsumer error socket path */
4195 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
4197 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
4201 /* 64-bit ustconsumer error socket path */
4202 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, gid
);
4204 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
4208 /* 32-bit ustconsumer compat32 error socket path */
4209 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, gid
);
4211 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
4215 DBG("All permissions are set");
4222 * Create the pipe used to wake up the kernel thread.
4223 * Closed in cleanup().
4225 static int create_kernel_poll_pipe(void)
4229 ret
= pipe(kernel_poll_pipe
);
4231 PERROR("kernel poll pipe");
4235 for (i
= 0; i
< 2; i
++) {
4236 ret
= fcntl(kernel_poll_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
4238 PERROR("fcntl kernel_poll_pipe");
4248 * Create the application command pipe to wake thread_manage_apps.
4249 * Closed in cleanup().
4251 static int create_apps_cmd_pipe(void)
4255 ret
= pipe(apps_cmd_pipe
);
4257 PERROR("apps cmd pipe");
4261 for (i
= 0; i
< 2; i
++) {
4262 ret
= fcntl(apps_cmd_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
4264 PERROR("fcntl apps_cmd_pipe");
4274 * Create the lttng run directory needed for all global sockets and pipe.
4276 static int create_lttng_rundir(const char *rundir
)
4280 DBG3("Creating LTTng run directory: %s", rundir
);
4282 ret
= mkdir(rundir
, S_IRWXU
);
4284 if (errno
!= EEXIST
) {
4285 ERR("Unable to create %s", rundir
);
4297 * Setup sockets and directory needed by the kconsumerd communication with the
4300 static int set_consumer_sockets(struct consumer_data
*consumer_data
,
4304 char path
[PATH_MAX
];
4306 switch (consumer_data
->type
) {
4307 case LTTNG_CONSUMER_KERNEL
:
4308 snprintf(path
, PATH_MAX
, DEFAULT_KCONSUMERD_PATH
, rundir
);
4310 case LTTNG_CONSUMER64_UST
:
4311 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD64_PATH
, rundir
);
4313 case LTTNG_CONSUMER32_UST
:
4314 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD32_PATH
, rundir
);
4317 ERR("Consumer type unknown");
4322 DBG2("Creating consumer directory: %s", path
);
4324 ret
= mkdir(path
, S_IRWXU
);
4326 if (errno
!= EEXIST
) {
4328 ERR("Failed to create %s", path
);
4334 /* Create the kconsumerd error unix socket */
4335 consumer_data
->err_sock
=
4336 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
4337 if (consumer_data
->err_sock
< 0) {
4338 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
4343 /* File permission MUST be 660 */
4344 ret
= chmod(consumer_data
->err_unix_sock_path
,
4345 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4347 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
4357 * Signal handler for the daemon
4359 * Simply stop all worker threads, leaving main() return gracefully after
4360 * joining all threads and calling cleanup().
4362 static void sighandler(int sig
)
4366 DBG("SIGPIPE caught");
4369 DBG("SIGINT caught");
4373 DBG("SIGTERM caught");
4382 * Setup signal handler for :
4383 * SIGINT, SIGTERM, SIGPIPE
4385 static int set_signal_handler(void)
4388 struct sigaction sa
;
4391 if ((ret
= sigemptyset(&sigset
)) < 0) {
4392 PERROR("sigemptyset");
4396 sa
.sa_handler
= sighandler
;
4397 sa
.sa_mask
= sigset
;
4399 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
4400 PERROR("sigaction");
4404 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
4405 PERROR("sigaction");
4409 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
4410 PERROR("sigaction");
4414 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4420 * Set open files limit to unlimited. This daemon can open a large number of
4421 * file descriptors in order to consumer multiple kernel traces.
4423 static void set_ulimit(void)
4428 /* The kernel does not allowed an infinite limit for open files */
4429 lim
.rlim_cur
= 65535;
4430 lim
.rlim_max
= 65535;
4432 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
4434 PERROR("failed to set open files limit");
4441 int main(int argc
, char **argv
)
4445 const char *home_path
;
4447 tracepoint(sessiond_boot_start
);
4449 init_kernel_workarounds();
4451 rcu_register_thread();
4453 /* Create thread quit pipe */
4454 if ((ret
= init_thread_quit_pipe()) < 0) {
4458 setup_consumerd_path();
4460 /* Parse arguments */
4462 if ((ret
= parse_args(argc
, argv
) < 0)) {
4475 /* Check if daemon is UID = 0 */
4476 is_root
= !getuid();
4479 rundir
= strdup(DEFAULT_LTTNG_RUNDIR
);
4481 /* Create global run dir with root access */
4482 ret
= create_lttng_rundir(rundir
);
4487 if (strlen(apps_unix_sock_path
) == 0) {
4488 snprintf(apps_unix_sock_path
, PATH_MAX
,
4489 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
4492 if (strlen(client_unix_sock_path
) == 0) {
4493 snprintf(client_unix_sock_path
, PATH_MAX
,
4494 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
4497 /* Set global SHM for ust */
4498 if (strlen(wait_shm_path
) == 0) {
4499 snprintf(wait_shm_path
, PATH_MAX
,
4500 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
4503 /* Setup kernel consumerd path */
4504 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
,
4505 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
, rundir
);
4506 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
,
4507 DEFAULT_KCONSUMERD_CMD_SOCK_PATH
, rundir
);
4509 DBG2("Kernel consumer err path: %s",
4510 kconsumer_data
.err_unix_sock_path
);
4511 DBG2("Kernel consumer cmd path: %s",
4512 kconsumer_data
.cmd_unix_sock_path
);
4514 home_path
= get_home_dir();
4515 if (home_path
== NULL
) {
4516 /* TODO: Add --socket PATH option */
4517 ERR("Can't get HOME directory for sockets creation.");
4523 * Create rundir from home path. This will create something like
4526 ret
= asprintf(&rundir
, DEFAULT_LTTNG_HOME_RUNDIR
, home_path
);
4532 ret
= create_lttng_rundir(rundir
);
4537 if (strlen(apps_unix_sock_path
) == 0) {
4538 snprintf(apps_unix_sock_path
, PATH_MAX
,
4539 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
4542 /* Set the cli tool unix socket path */
4543 if (strlen(client_unix_sock_path
) == 0) {
4544 snprintf(client_unix_sock_path
, PATH_MAX
,
4545 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
4548 /* Set global SHM for ust */
4549 if (strlen(wait_shm_path
) == 0) {
4550 snprintf(wait_shm_path
, PATH_MAX
,
4551 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
4555 DBG("Client socket path %s", client_unix_sock_path
);
4556 DBG("Application socket path %s", apps_unix_sock_path
);
4557 DBG("LTTng run directory path: %s", rundir
);
4559 /* 32 bits consumerd path setup */
4560 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
,
4561 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, rundir
);
4562 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
,
4563 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, rundir
);
4565 DBG2("UST consumer 32 bits err path: %s",
4566 ustconsumer32_data
.err_unix_sock_path
);
4567 DBG2("UST consumer 32 bits cmd path: %s",
4568 ustconsumer32_data
.cmd_unix_sock_path
);
4570 /* 64 bits consumerd path setup */
4571 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
,
4572 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, rundir
);
4573 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
,
4574 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, rundir
);
4576 DBG2("UST consumer 64 bits err path: %s",
4577 ustconsumer64_data
.err_unix_sock_path
);
4578 DBG2("UST consumer 64 bits cmd path: %s",
4579 ustconsumer64_data
.cmd_unix_sock_path
);
4582 * See if daemon already exist.
4584 if ((ret
= check_existing_daemon()) < 0) {
4585 ERR("Already running daemon.\n");
4587 * We do not goto exit because we must not cleanup()
4588 * because a daemon is already running.
4593 /* After this point, we can safely call cleanup() with "goto exit" */
4596 * These actions must be executed as root. We do that *after* setting up
4597 * the sockets path because we MUST make the check for another daemon using
4598 * those paths *before* trying to set the kernel consumer sockets and init
4602 ret
= set_consumer_sockets(&kconsumer_data
, rundir
);
4607 /* Setup kernel tracer */
4608 if (!opt_no_kernel
) {
4609 init_kernel_tracer();
4612 /* Set ulimit for open files */
4616 ret
= set_consumer_sockets(&ustconsumer64_data
, rundir
);
4621 ret
= set_consumer_sockets(&ustconsumer32_data
, rundir
);
4626 if ((ret
= set_signal_handler()) < 0) {
4630 /* Setup the needed unix socket */
4631 if ((ret
= init_daemon_socket()) < 0) {
4635 /* Set credentials to socket */
4636 if (is_root
&& ((ret
= set_permissions(rundir
)) < 0)) {
4640 /* Get parent pid if -S, --sig-parent is specified. */
4641 if (opt_sig_parent
) {
4645 /* Setup the kernel pipe for waking up the kernel thread */
4646 if ((ret
= create_kernel_poll_pipe()) < 0) {
4650 /* Setup the thread apps communication pipe. */
4651 if ((ret
= create_apps_cmd_pipe()) < 0) {
4655 /* Init UST command queue. */
4656 cds_wfq_init(&ust_cmd_queue
.queue
);
4658 /* Init UST app hash table */
4662 * Get session list pointer. This pointer MUST NOT be free(). This list is
4663 * statically declared in session.c
4665 session_list_ptr
= session_get_list();
4667 /* Set up max poll set size */
4668 lttng_poll_set_max_size();
4670 /* Create thread to manage the client socket */
4671 ret
= pthread_create(&client_thread
, NULL
,
4672 thread_manage_clients
, (void *) NULL
);
4674 PERROR("pthread_create clients");
4678 /* Create thread to dispatch registration */
4679 ret
= pthread_create(&dispatch_thread
, NULL
,
4680 thread_dispatch_ust_registration
, (void *) NULL
);
4682 PERROR("pthread_create dispatch");
4686 /* Create thread to manage application registration. */
4687 ret
= pthread_create(®_apps_thread
, NULL
,
4688 thread_registration_apps
, (void *) NULL
);
4690 PERROR("pthread_create registration");
4694 /* Create thread to manage application socket */
4695 ret
= pthread_create(&apps_thread
, NULL
,
4696 thread_manage_apps
, (void *) NULL
);
4698 PERROR("pthread_create apps");
4702 /* Create kernel thread to manage kernel event */
4703 ret
= pthread_create(&kernel_thread
, NULL
,
4704 thread_manage_kernel
, (void *) NULL
);
4706 PERROR("pthread_create kernel");
4710 tracepoint(sessiond_boot_end
);
4712 ret
= pthread_join(kernel_thread
, &status
);
4714 PERROR("pthread_join");
4715 goto error
; /* join error, exit without cleanup */
4719 ret
= pthread_join(apps_thread
, &status
);
4721 PERROR("pthread_join");
4722 goto error
; /* join error, exit without cleanup */
4726 ret
= pthread_join(reg_apps_thread
, &status
);
4728 PERROR("pthread_join");
4729 goto error
; /* join error, exit without cleanup */
4733 ret
= pthread_join(dispatch_thread
, &status
);
4735 PERROR("pthread_join");
4736 goto error
; /* join error, exit without cleanup */
4740 ret
= pthread_join(client_thread
, &status
);
4742 PERROR("pthread_join");
4743 goto error
; /* join error, exit without cleanup */
4746 ret
= join_consumer_thread(&kconsumer_data
);
4748 PERROR("join_consumer");
4749 goto error
; /* join error, exit without cleanup */
4755 * cleanup() is called when no other thread is running.
4757 rcu_thread_online();
4759 rcu_thread_offline();
4760 rcu_unregister_thread();