2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
25 #include <semaphore.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
35 #include <sys/types.h>
37 #include <urcu/futex.h>
41 #include <lttng-consumerd.h>
43 #include <lttng-sessiond-comm.h>
44 #include <lttng/lttng-consumer.h>
50 #include "compat/poll.h"
55 #include "lttng-sessiond.h"
61 #define CONSUMERD_FILE "lttng-consumerd"
63 struct consumer_data
{
64 enum lttng_consumer_type type
;
66 pthread_t thread
; /* Worker thread interacting with the consumer */
69 /* Mutex to control consumerd pid assignation */
70 pthread_mutex_t pid_mutex
;
76 /* consumer error and command Unix socket path */
77 char err_unix_sock_path
[PATH_MAX
];
78 char cmd_unix_sock_path
[PATH_MAX
];
81 #include "benchmark.h"
84 const char default_home_dir
[] = DEFAULT_HOME_DIR
;
85 const char default_tracing_group
[] = LTTNG_DEFAULT_TRACING_GROUP
;
86 const char default_ust_sock_dir
[] = DEFAULT_UST_SOCK_DIR
;
87 const char default_global_apps_pipe
[] = DEFAULT_GLOBAL_APPS_PIPE
;
90 int opt_verbose
; /* Not static for lttngerr.h */
91 int opt_verbose_consumer
; /* Not static for lttngerr.h */
92 int opt_quiet
; /* Not static for lttngerr.h */
95 const char *opt_tracing_group
;
96 static int opt_sig_parent
;
97 static int opt_daemon
;
98 static int opt_no_kernel
;
99 static int is_root
; /* Set to 1 if the daemon is running as root */
100 static pid_t ppid
; /* Parent PID for --sig-parent option */
103 /* Consumer daemon specific control data */
104 static struct consumer_data kconsumer_data
= {
105 .type
= LTTNG_CONSUMER_KERNEL
,
106 .err_unix_sock_path
= KCONSUMERD_ERR_SOCK_PATH
,
107 .cmd_unix_sock_path
= KCONSUMERD_CMD_SOCK_PATH
,
109 static struct consumer_data ustconsumer64_data
= {
110 .type
= LTTNG_CONSUMER64_UST
,
111 .err_unix_sock_path
= USTCONSUMERD64_ERR_SOCK_PATH
,
112 .cmd_unix_sock_path
= USTCONSUMERD64_CMD_SOCK_PATH
,
114 static struct consumer_data ustconsumer32_data
= {
115 .type
= LTTNG_CONSUMER32_UST
,
116 .err_unix_sock_path
= USTCONSUMERD32_ERR_SOCK_PATH
,
117 .cmd_unix_sock_path
= USTCONSUMERD32_CMD_SOCK_PATH
,
120 static int dispatch_thread_exit
;
122 /* Global application Unix socket path */
123 static char apps_unix_sock_path
[PATH_MAX
];
124 /* Global client Unix socket path */
125 static char client_unix_sock_path
[PATH_MAX
];
126 /* global wait shm path for UST */
127 static char wait_shm_path
[PATH_MAX
];
129 /* Sockets and FDs */
130 static int client_sock
;
131 static int apps_sock
;
132 static int kernel_tracer_fd
;
133 static int kernel_poll_pipe
[2];
136 * Quit pipe for all threads. This permits a single cancellation point
137 * for all threads when receiving an event on the pipe.
139 static int thread_quit_pipe
[2];
142 * This pipe is used to inform the thread managing application communication
143 * that a command is queued and ready to be processed.
145 static int apps_cmd_pipe
[2];
147 /* Pthread, Mutexes and Semaphores */
148 static pthread_t apps_thread
;
149 static pthread_t reg_apps_thread
;
150 static pthread_t client_thread
;
151 static pthread_t kernel_thread
;
152 static pthread_t dispatch_thread
;
156 * UST registration command queue. This queue is tied with a futex and uses a N
157 * wakers / 1 waiter implemented and detailed in futex.c/.h
159 * The thread_manage_apps and thread_dispatch_ust_registration interact with
160 * this queue and the wait/wake scheme.
162 static struct ust_cmd_queue ust_cmd_queue
;
165 * Pointer initialized before thread creation.
167 * This points to the tracing session list containing the session count and a
168 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
169 * MUST NOT be taken if you call a public function in session.c.
171 * The lock is nested inside the structure: session_list_ptr->lock. Please use
172 * session_lock_list and session_unlock_list for lock acquisition.
174 static struct ltt_session_list
*session_list_ptr
;
176 int ust_consumerd64_fd
= -1;
177 int ust_consumerd32_fd
= -1;
179 static const char *consumerd32_bin
= CONFIG_CONSUMERD32_BIN
;
180 static const char *consumerd64_bin
= CONFIG_CONSUMERD64_BIN
;
181 static const char *consumerd32_libdir
= CONFIG_CONSUMERD32_LIBDIR
;
182 static const char *consumerd64_libdir
= CONFIG_CONSUMERD64_LIBDIR
;
185 void setup_consumerd_path(void)
187 const char *bin
, *libdir
;
190 * Allow INSTALL_BIN_PATH to be used as a target path for the
191 * native architecture size consumer if CONFIG_CONSUMER*_PATH
192 * has not been defined.
194 #if (CAA_BITS_PER_LONG == 32)
195 if (!consumerd32_bin
[0]) {
196 consumerd32_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
198 if (!consumerd32_libdir
[0]) {
199 consumerd32_libdir
= INSTALL_LIB_PATH
;
201 #elif (CAA_BITS_PER_LONG == 64)
202 if (!consumerd64_bin
[0]) {
203 consumerd64_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
205 if (!consumerd64_libdir
[0]) {
206 consumerd64_libdir
= INSTALL_LIB_PATH
;
209 #error "Unknown bitness"
213 * runtime env. var. overrides the build default.
215 bin
= getenv("LTTNG_CONSUMERD32_BIN");
217 consumerd32_bin
= bin
;
219 bin
= getenv("LTTNG_CONSUMERD64_BIN");
221 consumerd64_bin
= bin
;
223 libdir
= getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
225 consumerd32_libdir
= libdir
;
227 libdir
= getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
229 consumerd64_libdir
= libdir
;
234 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
236 static int create_thread_poll_set(struct lttng_poll_event
*events
,
241 if (events
== NULL
|| size
== 0) {
246 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
252 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
264 * Check if the thread quit pipe was triggered.
266 * Return 1 if it was triggered else 0;
268 static int check_thread_quit_pipe(int fd
, uint32_t events
)
270 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
278 * Remove modules in reverse load order.
280 static int modprobe_remove_kernel_modules(void)
285 for (i
= ARRAY_SIZE(kernel_modules_list
) - 1; i
>= 0; i
--) {
286 ret
= snprintf(modprobe
, sizeof(modprobe
),
287 "/sbin/modprobe -r -q %s",
288 kernel_modules_list
[i
].name
);
290 perror("snprintf modprobe -r");
293 modprobe
[sizeof(modprobe
) - 1] = '\0';
294 ret
= system(modprobe
);
296 ERR("Unable to launch modprobe -r for module %s",
297 kernel_modules_list
[i
].name
);
298 } else if (kernel_modules_list
[i
].required
299 && WEXITSTATUS(ret
) != 0) {
300 ERR("Unable to remove module %s",
301 kernel_modules_list
[i
].name
);
303 DBG("Modprobe removal successful %s",
304 kernel_modules_list
[i
].name
);
313 * Return group ID of the tracing group or -1 if not found.
315 static gid_t
allowed_group(void)
319 if (opt_tracing_group
) {
320 grp
= getgrnam(opt_tracing_group
);
322 grp
= getgrnam(default_tracing_group
);
332 * Init thread quit pipe.
334 * Return -1 on error or 0 if all pipes are created.
336 static int init_thread_quit_pipe(void)
340 ret
= pipe2(thread_quit_pipe
, O_CLOEXEC
);
342 perror("thread quit pipe");
351 * Complete teardown of a kernel session. This free all data structure related
352 * to a kernel session and update counter.
354 static void teardown_kernel_session(struct ltt_session
*session
)
356 if (!session
->kernel_session
) {
357 DBG3("No kernel session when tearingdown session");
361 DBG("Tearing down kernel session");
364 * If a custom kernel consumer was registered, close the socket before
365 * tearing down the complete kernel session structure
367 if (session
->kernel_session
->consumer_fd
!= kconsumer_data
.cmd_sock
) {
368 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
371 trace_kernel_destroy_session(session
->kernel_session
);
375 * Complete teardown of all UST sessions. This will free everything on his path
376 * and destroy the core essence of all ust sessions :)
378 static void teardown_ust_session(struct ltt_session
*session
)
382 if (!session
->ust_session
) {
383 DBG3("No UST session when tearingdown session");
387 DBG("Tearing down UST session(s)");
389 ret
= ust_app_destroy_trace_all(session
->ust_session
);
391 ERR("Error in ust_app_destroy_trace_all");
394 trace_ust_destroy_session(session
->ust_session
);
398 * Stop all threads by closing the thread quit pipe.
400 static void stop_threads(void)
404 /* Stopping all threads */
405 DBG("Terminating all threads");
406 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
408 ERR("write error on thread quit pipe");
411 /* Dispatch thread */
412 dispatch_thread_exit
= 1;
413 futex_nto1_wake(&ust_cmd_queue
.futex
);
419 static void cleanup(void)
423 struct ltt_session
*sess
, *stmp
;
427 DBG("Removing %s directory", rundir
);
428 ret
= asprintf(&cmd
, "rm -rf %s", rundir
);
430 ERR("asprintf failed. Something is really wrong!");
433 /* Remove lttng run directory */
436 ERR("Unable to clean %s", rundir
);
440 DBG("Cleaning up all session");
442 /* Destroy session list mutex */
443 if (session_list_ptr
!= NULL
) {
444 pthread_mutex_destroy(&session_list_ptr
->lock
);
446 /* Cleanup ALL session */
447 cds_list_for_each_entry_safe(sess
, stmp
,
448 &session_list_ptr
->head
, list
) {
449 teardown_kernel_session(sess
);
450 teardown_ust_session(sess
);
455 DBG("Closing all UST sockets");
456 ust_app_clean_list();
458 pthread_mutex_destroy(&kconsumer_data
.pid_mutex
);
460 if (is_root
&& !opt_no_kernel
) {
461 DBG2("Closing kernel fd");
462 close(kernel_tracer_fd
);
463 DBG("Unloading kernel modules");
464 modprobe_remove_kernel_modules();
467 close(thread_quit_pipe
[0]);
468 close(thread_quit_pipe
[1]);
470 /* OUTPUT BENCHMARK RESULTS */
473 if (getenv("BENCH_UST_NOTIFY")) {
474 bench_print_ust_notification();
477 if (getenv("BENCH_UST_REGISTER")) {
478 bench_print_ust_register();
479 bench_print_ust_unregister();
482 if (getenv("BENCH_BOOT_PROCESS")) {
483 bench_print_boot_process();
490 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
491 "Matthew, BEET driven development works!%c[%dm",
492 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
497 * Send data on a unix socket using the liblttsessiondcomm API.
499 * Return lttcomm error code.
501 static int send_unix_sock(int sock
, void *buf
, size_t len
)
503 /* Check valid length */
508 return lttcomm_send_unix_sock(sock
, buf
, len
);
512 * Free memory of a command context structure.
514 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
516 DBG("Clean command context structure");
518 if ((*cmd_ctx
)->llm
) {
519 free((*cmd_ctx
)->llm
);
521 if ((*cmd_ctx
)->lsm
) {
522 free((*cmd_ctx
)->lsm
);
530 * Send all stream fds of kernel channel to the consumer.
532 static int send_kconsumer_channel_streams(struct consumer_data
*consumer_data
,
533 int sock
, struct ltt_kernel_channel
*channel
,
534 uid_t uid
, gid_t gid
)
537 struct ltt_kernel_stream
*stream
;
538 struct lttcomm_consumer_msg lkm
;
540 DBG("Sending streams of channel %s to kernel consumer",
541 channel
->channel
->name
);
544 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
545 lkm
.u
.channel
.channel_key
= channel
->fd
;
546 lkm
.u
.channel
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
547 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
548 DBG("Sending channel %d to consumer", lkm
.u
.channel
.channel_key
);
549 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
551 perror("send consumer channel");
556 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
560 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
561 lkm
.u
.stream
.channel_key
= channel
->fd
;
562 lkm
.u
.stream
.stream_key
= stream
->fd
;
563 lkm
.u
.stream
.state
= stream
->state
;
564 lkm
.u
.stream
.output
= channel
->channel
->attr
.output
;
565 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
566 lkm
.u
.stream
.uid
= uid
;
567 lkm
.u
.stream
.gid
= gid
;
568 strncpy(lkm
.u
.stream
.path_name
, stream
->pathname
, PATH_MAX
- 1);
569 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
570 DBG("Sending stream %d to consumer", lkm
.u
.stream
.stream_key
);
571 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
573 perror("send consumer stream");
576 ret
= lttcomm_send_fds_unix_sock(sock
, &stream
->fd
, 1);
578 perror("send consumer stream ancillary data");
583 DBG("consumer channel streams sent");
592 * Send all stream fds of the kernel session to the consumer.
594 static int send_kconsumer_session_streams(struct consumer_data
*consumer_data
,
595 struct ltt_kernel_session
*session
)
598 struct ltt_kernel_channel
*chan
;
599 struct lttcomm_consumer_msg lkm
;
600 int sock
= session
->consumer_fd
;
602 DBG("Sending metadata stream fd");
604 /* Extra protection. It's NOT supposed to be set to 0 at this point */
605 if (session
->consumer_fd
== 0) {
606 session
->consumer_fd
= consumer_data
->cmd_sock
;
609 if (session
->metadata_stream_fd
!= 0) {
610 /* Send metadata channel fd */
611 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
612 lkm
.u
.channel
.channel_key
= session
->metadata
->fd
;
613 lkm
.u
.channel
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
614 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
615 DBG("Sending metadata channel %d to consumer", lkm
.u
.stream
.stream_key
);
616 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
618 perror("send consumer channel");
622 /* Send metadata stream fd */
623 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
624 lkm
.u
.stream
.channel_key
= session
->metadata
->fd
;
625 lkm
.u
.stream
.stream_key
= session
->metadata_stream_fd
;
626 lkm
.u
.stream
.state
= LTTNG_CONSUMER_ACTIVE_STREAM
;
627 lkm
.u
.stream
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
628 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
629 lkm
.u
.stream
.uid
= session
->uid
;
630 lkm
.u
.stream
.gid
= session
->gid
;
631 strncpy(lkm
.u
.stream
.path_name
, session
->metadata
->pathname
, PATH_MAX
- 1);
632 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
633 DBG("Sending metadata stream %d to consumer", lkm
.u
.stream
.stream_key
);
634 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
636 perror("send consumer stream");
639 ret
= lttcomm_send_fds_unix_sock(sock
, &session
->metadata_stream_fd
, 1);
641 perror("send consumer stream");
646 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
647 ret
= send_kconsumer_channel_streams(consumer_data
, sock
, chan
,
648 session
->uid
, session
->gid
);
654 DBG("consumer fds (metadata and channel streams) sent");
663 * Notify UST applications using the shm mmap futex.
665 static int notify_ust_apps(int active
)
669 DBG("Notifying applications of session daemon state: %d", active
);
671 tracepoint(ust_notify_apps_start
);
673 /* See shm.c for this call implying mmap, shm and futex calls */
674 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
675 if (wait_shm_mmap
== NULL
) {
679 /* Wake waiting process */
680 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
682 tracepoint(ust_notify_apps_stop
);
684 /* Apps notified successfully */
692 * Setup the outgoing data buffer for the response (llm) by allocating the
693 * right amount of memory and copying the original information from the lsm
696 * Return total size of the buffer pointed by buf.
698 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
704 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
705 if (cmd_ctx
->llm
== NULL
) {
711 /* Copy common data */
712 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
713 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
715 cmd_ctx
->llm
->data_size
= size
;
716 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
725 * Update the kernel poll set of all channel fd available over all tracing
726 * session. Add the wakeup pipe at the end of the set.
728 static int update_kernel_poll(struct lttng_poll_event
*events
)
731 struct ltt_session
*session
;
732 struct ltt_kernel_channel
*channel
;
734 DBG("Updating kernel poll set");
737 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
738 session_lock(session
);
739 if (session
->kernel_session
== NULL
) {
740 session_unlock(session
);
744 cds_list_for_each_entry(channel
,
745 &session
->kernel_session
->channel_list
.head
, list
) {
746 /* Add channel fd to the kernel poll set */
747 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
749 session_unlock(session
);
752 DBG("Channel fd %d added to kernel set", channel
->fd
);
754 session_unlock(session
);
756 session_unlock_list();
761 session_unlock_list();
766 * Find the channel fd from 'fd' over all tracing session. When found, check
767 * for new channel stream and send those stream fds to the kernel consumer.
769 * Useful for CPU hotplug feature.
771 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
774 struct ltt_session
*session
;
775 struct ltt_kernel_channel
*channel
;
777 DBG("Updating kernel streams for channel fd %d", fd
);
780 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
781 session_lock(session
);
782 if (session
->kernel_session
== NULL
) {
783 session_unlock(session
);
787 /* This is not suppose to be 0 but this is an extra security check */
788 if (session
->kernel_session
->consumer_fd
== 0) {
789 session
->kernel_session
->consumer_fd
= consumer_data
->cmd_sock
;
792 cds_list_for_each_entry(channel
,
793 &session
->kernel_session
->channel_list
.head
, list
) {
794 if (channel
->fd
== fd
) {
795 DBG("Channel found, updating kernel streams");
796 ret
= kernel_open_channel_stream(channel
);
802 * Have we already sent fds to the consumer? If yes, it means
803 * that tracing is started so it is safe to send our updated
806 if (session
->kernel_session
->consumer_fds_sent
== 1) {
807 ret
= send_kconsumer_channel_streams(consumer_data
,
808 session
->kernel_session
->consumer_fd
, channel
,
809 session
->uid
, session
->gid
);
817 session_unlock(session
);
819 session_unlock_list();
823 session_unlock(session
);
824 session_unlock_list();
829 * For each tracing session, update newly registered apps.
831 static void update_ust_app(int app_sock
)
833 struct ltt_session
*sess
, *stmp
;
835 /* For all tracing session(s) */
836 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
837 if (sess
->ust_session
) {
838 ust_app_global_update(sess
->ust_session
, app_sock
);
844 * This thread manage event coming from the kernel.
846 * Features supported in this thread:
849 static void *thread_manage_kernel(void *data
)
851 int ret
, i
, pollfd
, update_poll_flag
= 1;
852 uint32_t revents
, nb_fd
;
854 struct lttng_poll_event events
;
856 tracepoint(sessiond_th_kern_start
);
858 DBG("Thread manage kernel started");
860 ret
= create_thread_poll_set(&events
, 2);
865 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
871 if (update_poll_flag
== 1) {
873 * Reset number of fd in the poll set. Always 2 since there is the thread
874 * quit pipe and the kernel pipe.
878 ret
= update_kernel_poll(&events
);
882 update_poll_flag
= 0;
885 nb_fd
= LTTNG_POLL_GETNB(&events
);
887 DBG("Thread kernel polling on %d fds", nb_fd
);
889 /* Zeroed the poll events */
890 lttng_poll_reset(&events
);
892 tracepoint(sessiond_th_kern_poll
);
894 /* Poll infinite value of time */
895 ret
= lttng_poll_wait(&events
, -1);
898 } else if (ret
== 0) {
899 /* Should not happen since timeout is infinite */
900 ERR("Return value of poll is 0 with an infinite timeout.\n"
901 "This should not have happened! Continuing...");
905 for (i
= 0; i
< nb_fd
; i
++) {
906 /* Fetch once the poll data */
907 revents
= LTTNG_POLL_GETEV(&events
, i
);
908 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
910 /* Thread quit pipe has been closed. Killing thread. */
911 ret
= check_thread_quit_pipe(pollfd
, revents
);
916 /* Check for data on kernel pipe */
917 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
918 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
919 update_poll_flag
= 1;
923 * New CPU detected by the kernel. Adding kernel stream to
924 * kernel session and updating the kernel consumer
926 if (revents
& LPOLLIN
) {
927 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
933 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
934 * and unregister kernel stream at this point.
942 DBG("Kernel thread dying");
943 close(kernel_poll_pipe
[0]);
944 close(kernel_poll_pipe
[1]);
946 lttng_poll_clean(&events
);
952 * This thread manage the consumer error sent back to the session daemon.
954 static void *thread_manage_consumer(void *data
)
956 int sock
= 0, i
, ret
, pollfd
;
957 uint32_t revents
, nb_fd
;
958 enum lttcomm_return_code code
;
959 struct lttng_poll_event events
;
960 struct consumer_data
*consumer_data
= data
;
962 tracepoint(sessiond_th_kcon_start
);
964 DBG("[thread] Manage consumer started");
966 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
972 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
973 * Nothing more will be added to this poll set.
975 ret
= create_thread_poll_set(&events
, 2);
980 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
985 nb_fd
= LTTNG_POLL_GETNB(&events
);
987 tracepoint(sessiond_th_kcon_poll
);
989 /* Inifinite blocking call, waiting for transmission */
990 ret
= lttng_poll_wait(&events
, -1);
995 for (i
= 0; i
< nb_fd
; i
++) {
996 /* Fetch once the poll data */
997 revents
= LTTNG_POLL_GETEV(&events
, i
);
998 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1000 /* Thread quit pipe has been closed. Killing thread. */
1001 ret
= check_thread_quit_pipe(pollfd
, revents
);
1006 /* Event on the registration socket */
1007 if (pollfd
== consumer_data
->err_sock
) {
1008 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1009 ERR("consumer err socket poll error");
1015 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
1020 DBG2("Receiving code from consumer err_sock");
1022 /* Getting status code from kconsumerd */
1023 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1024 sizeof(enum lttcomm_return_code
));
1029 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
1030 consumer_data
->cmd_sock
=
1031 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1032 if (consumer_data
->cmd_sock
< 0) {
1033 sem_post(&consumer_data
->sem
);
1034 PERROR("consumer connect");
1037 /* Signal condition to tell that the kconsumerd is ready */
1038 sem_post(&consumer_data
->sem
);
1039 DBG("consumer command socket ready");
1041 ERR("consumer error when waiting for SOCK_READY : %s",
1042 lttcomm_get_readable_code(-code
));
1046 /* Remove the kconsumerd error sock since we've established a connexion */
1047 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1052 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1057 /* Update number of fd */
1058 nb_fd
= LTTNG_POLL_GETNB(&events
);
1060 /* Inifinite blocking call, waiting for transmission */
1061 ret
= lttng_poll_wait(&events
, -1);
1066 for (i
= 0; i
< nb_fd
; i
++) {
1067 /* Fetch once the poll data */
1068 revents
= LTTNG_POLL_GETEV(&events
, i
);
1069 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1071 /* Thread quit pipe has been closed. Killing thread. */
1072 ret
= check_thread_quit_pipe(pollfd
, revents
);
1077 /* Event on the kconsumerd socket */
1078 if (pollfd
== sock
) {
1079 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1080 ERR("consumer err socket second poll error");
1086 /* Wait for any kconsumerd error */
1087 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1088 sizeof(enum lttcomm_return_code
));
1090 ERR("consumer closed the command socket");
1094 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
1097 DBG("consumer thread dying");
1098 close(consumer_data
->err_sock
);
1099 close(consumer_data
->cmd_sock
);
1102 unlink(consumer_data
->err_unix_sock_path
);
1103 unlink(consumer_data
->cmd_unix_sock_path
);
1104 consumer_data
->pid
= 0;
1106 lttng_poll_clean(&events
);
1112 * This thread manage application communication.
1114 static void *thread_manage_apps(void *data
)
1117 uint32_t revents
, nb_fd
;
1118 struct ust_command ust_cmd
;
1119 struct lttng_poll_event events
;
1121 tracepoint(sessiond_th_apps_start
);
1123 DBG("[thread] Manage application started");
1125 rcu_register_thread();
1126 rcu_thread_online();
1128 ret
= create_thread_poll_set(&events
, 2);
1133 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1139 /* Zeroed the events structure */
1140 lttng_poll_reset(&events
);
1142 nb_fd
= LTTNG_POLL_GETNB(&events
);
1144 DBG("Apps thread polling on %d fds", nb_fd
);
1146 tracepoint(sessiond_th_apps_poll
);
1148 /* Inifinite blocking call, waiting for transmission */
1149 ret
= lttng_poll_wait(&events
, -1);
1154 for (i
= 0; i
< nb_fd
; i
++) {
1155 /* Fetch once the poll data */
1156 revents
= LTTNG_POLL_GETEV(&events
, i
);
1157 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1159 /* Thread quit pipe has been closed. Killing thread. */
1160 ret
= check_thread_quit_pipe(pollfd
, revents
);
1165 /* Inspect the apps cmd pipe */
1166 if (pollfd
== apps_cmd_pipe
[0]) {
1167 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1168 ERR("Apps command pipe error");
1170 } else if (revents
& LPOLLIN
) {
1171 tracepoint(ust_register_read_start
);
1173 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1174 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1175 perror("read apps cmd pipe");
1178 tracepoint(ust_register_read_stop
);
1180 tracepoint(ust_register_add_start
);
1181 /* Register applicaton to the session daemon */
1182 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1184 if (ret
== -ENOMEM
) {
1186 } else if (ret
< 0) {
1189 tracepoint(ust_register_add_stop
);
1191 tracepoint(ust_register_done_start
);
1193 * Add channel(s) and event(s) to newly registered apps
1194 * from lttng global UST domain.
1196 update_ust_app(ust_cmd
.sock
);
1198 ret
= ust_app_register_done(ust_cmd
.sock
);
1201 * If the registration is not possible, we simply
1202 * unregister the apps and continue
1204 ust_app_unregister(ust_cmd
.sock
);
1207 * We just need here to monitor the close of the UST
1208 * socket and poll set monitor those by default.
1210 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, 0);
1215 DBG("Apps with sock %d added to poll set",
1218 tracepoint(ust_register_done_stop
);
1223 * At this point, we know that a registered application made
1224 * the event at poll_wait.
1226 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1227 tracepoint(ust_unregister_start
);
1229 /* Removing from the poll set */
1230 ret
= lttng_poll_del(&events
, pollfd
);
1235 /* Socket closed on remote end. */
1236 ust_app_unregister(pollfd
);
1238 tracepoint(ust_unregister_stop
);
1246 DBG("Application communication apps dying");
1247 close(apps_cmd_pipe
[0]);
1248 close(apps_cmd_pipe
[1]);
1250 lttng_poll_clean(&events
);
1252 rcu_thread_offline();
1253 rcu_unregister_thread();
1258 * Dispatch request from the registration threads to the application
1259 * communication thread.
1261 static void *thread_dispatch_ust_registration(void *data
)
1264 struct cds_wfq_node
*node
;
1265 struct ust_command
*ust_cmd
= NULL
;
1267 tracepoint(sessiond_th_dispatch_start
);
1269 DBG("[thread] Dispatch UST command started");
1271 while (!dispatch_thread_exit
) {
1272 /* Atomically prepare the queue futex */
1273 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1276 tracepoint(sessiond_th_dispatch_block
);
1278 /* Dequeue command for registration */
1279 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1281 DBG("Woken up but nothing in the UST command queue");
1282 /* Continue thread execution */
1286 tracepoint(ust_dispatch_register_start
);
1288 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1290 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1291 " gid:%d sock:%d name:%s (version %d.%d)",
1292 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1293 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1294 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1295 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1297 * Inform apps thread of the new application registration. This
1298 * call is blocking so we can be assured that the data will be read
1299 * at some point in time or wait to the end of the world :)
1301 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1302 sizeof(struct ust_command
));
1304 perror("write apps cmd pipe");
1305 if (errno
== EBADF
) {
1307 * We can't inform the application thread to process
1308 * registration. We will exit or else application
1309 * registration will not occur and tracing will never
1316 } while (node
!= NULL
);
1318 tracepoint(ust_dispatch_register_stop
);
1320 /* Futex wait on queue. Blocking call on futex() */
1321 futex_nto1_wait(&ust_cmd_queue
.futex
);
1325 DBG("Dispatch thread dying");
1330 * This thread manage application registration.
1332 static void *thread_registration_apps(void *data
)
1334 int sock
= 0, i
, ret
, pollfd
;
1335 uint32_t revents
, nb_fd
;
1336 struct lttng_poll_event events
;
1338 * Get allocated in this thread, enqueued to a global queue, dequeued and
1339 * freed in the manage apps thread.
1341 struct ust_command
*ust_cmd
= NULL
;
1343 tracepoint(sessiond_th_reg_start
);
1345 DBG("[thread] Manage application registration started");
1347 ret
= lttcomm_listen_unix_sock(apps_sock
);
1353 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1354 * more will be added to this poll set.
1356 ret
= create_thread_poll_set(&events
, 2);
1361 /* Add the application registration socket */
1362 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1367 /* Notify all applications to register */
1368 ret
= notify_ust_apps(1);
1370 ERR("Failed to notify applications or create the wait shared memory.\n"
1371 "Execution continues but there might be problem for already\n"
1372 "running applications that wishes to register.");
1376 DBG("Accepting application registration");
1378 tracepoint(sessiond_th_reg_poll
);
1380 nb_fd
= LTTNG_POLL_GETNB(&events
);
1382 /* Inifinite blocking call, waiting for transmission */
1383 ret
= lttng_poll_wait(&events
, -1);
1388 for (i
= 0; i
< nb_fd
; i
++) {
1389 /* Fetch once the poll data */
1390 revents
= LTTNG_POLL_GETEV(&events
, i
);
1391 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1393 /* Thread quit pipe has been closed. Killing thread. */
1394 ret
= check_thread_quit_pipe(pollfd
, revents
);
1399 /* Event on the registration socket */
1400 if (pollfd
== apps_sock
) {
1401 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1402 ERR("Register apps socket poll error");
1404 } else if (revents
& LPOLLIN
) {
1405 /* Registration starts here. Recording cycles */
1406 tracepoint(ust_register_start
);
1408 sock
= lttcomm_accept_unix_sock(apps_sock
);
1413 /* Create UST registration command for enqueuing */
1414 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1415 if (ust_cmd
== NULL
) {
1416 perror("ust command zmalloc");
1421 * Using message-based transmissions to ensure we don't
1422 * have to deal with partially received messages.
1424 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1425 sizeof(struct ust_register_msg
));
1426 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1428 perror("lttcomm_recv_unix_sock register apps");
1430 ERR("Wrong size received on apps register");
1437 ust_cmd
->sock
= sock
;
1439 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1440 " gid:%d sock:%d name:%s (version %d.%d)",
1441 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1442 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1443 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1444 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1447 * Lock free enqueue the registration request. The red pill
1448 * has been taken! This apps will be part of the *system*.
1450 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1453 * Wake the registration queue futex. Implicit memory
1454 * barrier with the exchange in cds_wfq_enqueue.
1456 futex_nto1_wake(&ust_cmd_queue
.futex
);
1458 tracepoint(ust_register_stop
);
1465 DBG("UST Registration thread dying");
1467 /* Notify that the registration thread is gone */
1472 unlink(apps_unix_sock_path
);
1474 lttng_poll_clean(&events
);
1480 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1481 * exec or it will fails.
1483 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1486 struct timespec timeout
;
1488 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1489 timeout
.tv_nsec
= 0;
1491 /* Setup semaphore */
1492 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1494 PERROR("sem_init consumer semaphore");
1498 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1499 thread_manage_consumer
, consumer_data
);
1501 PERROR("pthread_create consumer");
1506 /* Get time for sem_timedwait absolute timeout */
1507 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1509 PERROR("clock_gettime spawn consumer");
1510 /* Infinite wait for the kconsumerd thread to be ready */
1511 ret
= sem_wait(&consumer_data
->sem
);
1513 /* Normal timeout if the gettime was successful */
1514 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1515 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1519 if (errno
== ETIMEDOUT
) {
1521 * Call has timed out so we kill the kconsumerd_thread and return
1524 ERR("The consumer thread was never ready. Killing it");
1525 ret
= pthread_cancel(consumer_data
->thread
);
1527 PERROR("pthread_cancel consumer thread");
1530 PERROR("semaphore wait failed consumer thread");
1535 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1536 if (consumer_data
->pid
== 0) {
1537 ERR("Kconsumerd did not start");
1538 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1541 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1550 * Join consumer thread
1552 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1557 if (consumer_data
->pid
!= 0) {
1558 ret
= kill(consumer_data
->pid
, SIGTERM
);
1560 ERR("Error killing consumer daemon");
1563 return pthread_join(consumer_data
->thread
, &status
);
1570 * Fork and exec a consumer daemon (consumerd).
1572 * Return pid if successful else -1.
1574 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1578 const char *consumer_to_use
;
1579 const char *verbosity
;
1582 DBG("Spawning consumerd");
1589 if (opt_verbose_consumer
) {
1590 verbosity
= "--verbose";
1592 verbosity
= "--quiet";
1594 switch (consumer_data
->type
) {
1595 case LTTNG_CONSUMER_KERNEL
:
1597 * Find out which consumerd to execute. We will
1598 * first try the 64-bit path, then the
1599 * sessiond's installation directory, and
1600 * fallback on the 32-bit one,
1602 DBG3("Looking for a kernel consumer at these locations:");
1603 DBG3(" 1) %s", consumerd64_bin
);
1604 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, CONSUMERD_FILE
);
1605 DBG3(" 3) %s", consumerd32_bin
);
1606 if (stat(consumerd64_bin
, &st
) == 0) {
1607 DBG3("Found location #1");
1608 consumer_to_use
= consumerd64_bin
;
1609 } else if (stat(INSTALL_BIN_PATH
"/" CONSUMERD_FILE
, &st
) == 0) {
1610 DBG3("Found location #2");
1611 consumer_to_use
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
1612 } else if (stat(consumerd32_bin
, &st
) == 0) {
1613 DBG3("Found location #3");
1614 consumer_to_use
= consumerd32_bin
;
1616 DBG("Could not find any valid consumerd executable");
1619 DBG("Using kernel consumer at: %s", consumer_to_use
);
1620 execl(consumer_to_use
,
1621 "lttng-consumerd", verbosity
, "-k",
1622 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1623 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1626 case LTTNG_CONSUMER64_UST
:
1628 char *tmpnew
= NULL
;
1630 if (consumerd64_libdir
[0] != '\0') {
1634 tmp
= getenv("LD_LIBRARY_PATH");
1638 tmplen
= strlen("LD_LIBRARY_PATH=")
1639 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
1640 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1645 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1646 strcat(tmpnew
, consumerd64_libdir
);
1647 if (tmp
[0] != '\0') {
1648 strcat(tmpnew
, ":");
1649 strcat(tmpnew
, tmp
);
1651 ret
= putenv(tmpnew
);
1657 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin
);
1658 ret
= execl(consumerd64_bin
, "lttng-consumerd", verbosity
, "-u",
1659 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1660 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1662 if (consumerd64_libdir
[0] != '\0') {
1670 case LTTNG_CONSUMER32_UST
:
1672 char *tmpnew
= NULL
;
1674 if (consumerd32_libdir
[0] != '\0') {
1678 tmp
= getenv("LD_LIBRARY_PATH");
1682 tmplen
= strlen("LD_LIBRARY_PATH=")
1683 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
1684 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1689 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1690 strcat(tmpnew
, consumerd32_libdir
);
1691 if (tmp
[0] != '\0') {
1692 strcat(tmpnew
, ":");
1693 strcat(tmpnew
, tmp
);
1695 ret
= putenv(tmpnew
);
1701 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin
);
1702 ret
= execl(consumerd32_bin
, "lttng-consumerd", verbosity
, "-u",
1703 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1704 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1706 if (consumerd32_libdir
[0] != '\0') {
1715 perror("unknown consumer type");
1719 perror("kernel start consumer exec");
1722 } else if (pid
> 0) {
1725 perror("start consumer fork");
1733 * Spawn the consumerd daemon and session daemon thread.
1735 static int start_consumerd(struct consumer_data
*consumer_data
)
1739 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1740 if (consumer_data
->pid
!= 0) {
1741 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1745 ret
= spawn_consumerd(consumer_data
);
1747 ERR("Spawning consumerd failed");
1748 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1752 /* Setting up the consumer_data pid */
1753 consumer_data
->pid
= ret
;
1754 DBG2("Consumer pid %d", consumer_data
->pid
);
1755 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1757 DBG2("Spawning consumer control thread");
1758 ret
= spawn_consumer_thread(consumer_data
);
1760 ERR("Fatal error spawning consumer control thread");
1772 * modprobe_kernel_modules
1774 static int modprobe_kernel_modules(void)
1779 for (i
= 0; i
< ARRAY_SIZE(kernel_modules_list
); i
++) {
1780 ret
= snprintf(modprobe
, sizeof(modprobe
),
1781 "/sbin/modprobe %s%s",
1782 kernel_modules_list
[i
].required
? "" : "-q ",
1783 kernel_modules_list
[i
].name
);
1785 perror("snprintf modprobe");
1788 modprobe
[sizeof(modprobe
) - 1] = '\0';
1789 ret
= system(modprobe
);
1791 ERR("Unable to launch modprobe for module %s",
1792 kernel_modules_list
[i
].name
);
1793 } else if (kernel_modules_list
[i
].required
1794 && WEXITSTATUS(ret
) != 0) {
1795 ERR("Unable to load module %s",
1796 kernel_modules_list
[i
].name
);
1798 DBG("Modprobe successfully %s",
1799 kernel_modules_list
[i
].name
);
1810 static int mount_debugfs(char *path
)
1813 char *type
= "debugfs";
1815 ret
= mkdir_recursive_run_as(path
, S_IRWXU
| S_IRWXG
, geteuid(), getegid());
1817 PERROR("Cannot create debugfs path");
1821 ret
= mount(type
, path
, type
, 0, NULL
);
1823 PERROR("Cannot mount debugfs");
1827 DBG("Mounted debugfs successfully at %s", path
);
1834 * Setup necessary data for kernel tracer action.
1836 static void init_kernel_tracer(void)
1839 char *proc_mounts
= "/proc/mounts";
1841 char *debugfs_path
= NULL
, *lttng_path
= NULL
;
1844 /* Detect debugfs */
1845 fp
= fopen(proc_mounts
, "r");
1847 ERR("Unable to probe %s", proc_mounts
);
1851 while (fgets(line
, sizeof(line
), fp
) != NULL
) {
1852 if (strstr(line
, "debugfs") != NULL
) {
1853 /* Remove first string */
1855 /* Dup string here so we can reuse line later on */
1856 debugfs_path
= strdup(strtok(NULL
, " "));
1857 DBG("Got debugfs path : %s", debugfs_path
);
1864 /* Mount debugfs if needded */
1865 if (debugfs_path
== NULL
) {
1866 ret
= asprintf(&debugfs_path
, "/mnt/debugfs");
1868 perror("asprintf debugfs path");
1871 ret
= mount_debugfs(debugfs_path
);
1873 perror("Cannot mount debugfs");
1878 /* Modprobe lttng kernel modules */
1879 ret
= modprobe_kernel_modules();
1884 /* Setup lttng kernel path */
1885 ret
= asprintf(<tng_path
, "%s/lttng", debugfs_path
);
1887 perror("asprintf lttng path");
1891 /* Open debugfs lttng */
1892 kernel_tracer_fd
= open(lttng_path
, O_RDWR
);
1893 if (kernel_tracer_fd
< 0) {
1894 DBG("Failed to open %s", lttng_path
);
1900 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1910 WARN("No kernel tracer available");
1911 kernel_tracer_fd
= 0;
1916 * Init tracing by creating trace directory and sending fds kernel consumer.
1918 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
1922 if (session
->consumer_fds_sent
== 0) {
1924 * Assign default kernel consumer socket if no consumer assigned to the
1925 * kernel session. At this point, it's NOT suppose to be 0 but this is
1926 * an extra security check.
1928 if (session
->consumer_fd
== 0) {
1929 session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1932 ret
= send_kconsumer_session_streams(&kconsumer_data
, session
);
1934 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1938 session
->consumer_fds_sent
= 1;
1946 * Create an UST session and add it to the session ust list.
1948 static int create_ust_session(struct ltt_session
*session
,
1949 struct lttng_domain
*domain
)
1951 struct ltt_ust_session
*lus
= NULL
;
1954 switch (domain
->type
) {
1955 case LTTNG_DOMAIN_UST
:
1958 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1962 DBG("Creating UST session");
1964 lus
= trace_ust_create_session(session
->path
, session
->id
, domain
);
1966 ret
= LTTCOMM_UST_SESS_FAIL
;
1970 ret
= mkdir_recursive_run_as(lus
->pathname
, S_IRWXU
| S_IRWXG
,
1971 session
->uid
, session
->gid
);
1973 if (ret
!= -EEXIST
) {
1974 ERR("Trace directory creation error");
1975 ret
= LTTCOMM_UST_SESS_FAIL
;
1980 /* The domain type dictate different actions on session creation */
1981 switch (domain
->type
) {
1982 case LTTNG_DOMAIN_UST
:
1983 /* No ustctl for the global UST domain */
1986 ERR("Unknown UST domain on create session %d", domain
->type
);
1989 lus
->uid
= session
->uid
;
1990 lus
->gid
= session
->gid
;
1991 session
->ust_session
= lus
;
2001 * Create a kernel tracer session then create the default channel.
2003 static int create_kernel_session(struct ltt_session
*session
)
2007 DBG("Creating kernel session");
2009 ret
= kernel_create_session(session
, kernel_tracer_fd
);
2011 ret
= LTTCOMM_KERN_SESS_FAIL
;
2015 /* Set kernel consumer socket fd */
2016 if (kconsumer_data
.cmd_sock
) {
2017 session
->kernel_session
->consumer_fd
= kconsumer_data
.cmd_sock
;
2020 ret
= mkdir_recursive_run_as(session
->kernel_session
->trace_path
,
2021 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2023 if (ret
!= -EEXIST
) {
2024 ERR("Trace directory creation error");
2028 session
->kernel_session
->uid
= session
->uid
;
2029 session
->kernel_session
->gid
= session
->gid
;
2036 * Check if the UID or GID match the session. Root user has access to
2039 static int session_access_ok(struct ltt_session
*session
,
2040 uid_t uid
, gid_t gid
)
2042 if (uid
!= session
->uid
&& gid
!= session
->gid
2050 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2053 struct ltt_session
*session
;
2055 DBG("Counting number of available session for UID %d GID %d",
2057 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2059 * Only list the sessions the user can control.
2061 if (!session_access_ok(session
, uid
, gid
)) {
2070 * Using the session list, filled a lttng_session array to send back to the
2071 * client for session listing.
2073 * The session list lock MUST be acquired before calling this function. Use
2074 * session_lock_list() and session_unlock_list().
2076 static void list_lttng_sessions(struct lttng_session
*sessions
,
2077 uid_t uid
, gid_t gid
)
2080 struct ltt_session
*session
;
2082 DBG("Getting all available session for UID %d GID %d",
2085 * Iterate over session list and append data after the control struct in
2088 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2090 * Only list the sessions the user can control.
2092 if (!session_access_ok(session
, uid
, gid
)) {
2095 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
2096 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
2097 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2098 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2099 sessions
[i
].enabled
= session
->enabled
;
2105 * Fill lttng_channel array of all channels.
2107 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
2108 struct lttng_channel
*channels
)
2111 struct ltt_kernel_channel
*kchan
;
2113 DBG("Listing channels for session %s", session
->name
);
2116 case LTTNG_DOMAIN_KERNEL
:
2117 /* Kernel channels */
2118 if (session
->kernel_session
!= NULL
) {
2119 cds_list_for_each_entry(kchan
,
2120 &session
->kernel_session
->channel_list
.head
, list
) {
2121 /* Copy lttng_channel struct to array */
2122 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
2123 channels
[i
].enabled
= kchan
->enabled
;
2128 case LTTNG_DOMAIN_UST
:
2130 struct lttng_ht_iter iter
;
2131 struct ltt_ust_channel
*uchan
;
2133 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
2134 &iter
.iter
, uchan
, node
.node
) {
2135 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
2136 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
2137 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
2138 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
2139 channels
[i
].attr
.switch_timer_interval
=
2140 uchan
->attr
.switch_timer_interval
;
2141 channels
[i
].attr
.read_timer_interval
=
2142 uchan
->attr
.read_timer_interval
;
2143 channels
[i
].enabled
= uchan
->enabled
;
2144 switch (uchan
->attr
.output
) {
2145 case LTTNG_UST_MMAP
:
2147 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
2160 * Create a list of ust global domain events.
2162 static int list_lttng_ust_global_events(char *channel_name
,
2163 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
2166 unsigned int nb_event
= 0;
2167 struct lttng_ht_iter iter
;
2168 struct lttng_ht_node_str
*node
;
2169 struct ltt_ust_channel
*uchan
;
2170 struct ltt_ust_event
*uevent
;
2171 struct lttng_event
*tmp
;
2173 DBG("Listing UST global events for channel %s", channel_name
);
2177 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
2178 node
= lttng_ht_iter_get_node_str(&iter
);
2180 ret
= -LTTCOMM_UST_CHAN_NOT_FOUND
;
2184 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
2186 nb_event
+= lttng_ht_get_count(uchan
->events
);
2188 if (nb_event
== 0) {
2193 DBG3("Listing UST global %d events", nb_event
);
2195 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2197 ret
= -LTTCOMM_FATAL
;
2201 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
2202 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
2203 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2204 tmp
[i
].enabled
= uevent
->enabled
;
2205 switch (uevent
->attr
.instrumentation
) {
2206 case LTTNG_UST_TRACEPOINT
:
2207 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2209 case LTTNG_UST_PROBE
:
2210 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
2212 case LTTNG_UST_FUNCTION
:
2213 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
2215 case LTTNG_UST_TRACEPOINT_LOGLEVEL
:
2216 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT_LOGLEVEL
;
2231 * Fill lttng_event array of all kernel events in the channel.
2233 static int list_lttng_kernel_events(char *channel_name
,
2234 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
2237 unsigned int nb_event
;
2238 struct ltt_kernel_event
*event
;
2239 struct ltt_kernel_channel
*kchan
;
2241 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
2242 if (kchan
== NULL
) {
2243 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2247 nb_event
= kchan
->event_count
;
2249 DBG("Listing events for channel %s", kchan
->channel
->name
);
2251 if (nb_event
== 0) {
2256 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2257 if (*events
== NULL
) {
2258 ret
= LTTCOMM_FATAL
;
2262 /* Kernel channels */
2263 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
2264 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
2265 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2266 (*events
)[i
].enabled
= event
->enabled
;
2267 switch (event
->event
->instrumentation
) {
2268 case LTTNG_KERNEL_TRACEPOINT
:
2269 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2271 case LTTNG_KERNEL_KPROBE
:
2272 case LTTNG_KERNEL_KRETPROBE
:
2273 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
2274 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
2275 sizeof(struct lttng_kernel_kprobe
));
2277 case LTTNG_KERNEL_FUNCTION
:
2278 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
2279 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
2280 sizeof(struct lttng_kernel_function
));
2282 case LTTNG_KERNEL_NOOP
:
2283 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
2285 case LTTNG_KERNEL_SYSCALL
:
2286 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
2288 case LTTNG_KERNEL_ALL
:
2302 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2304 static int cmd_disable_channel(struct ltt_session
*session
,
2305 int domain
, char *channel_name
)
2308 struct ltt_ust_session
*usess
;
2310 usess
= session
->ust_session
;
2313 case LTTNG_DOMAIN_KERNEL
:
2315 ret
= channel_kernel_disable(session
->kernel_session
,
2317 if (ret
!= LTTCOMM_OK
) {
2321 kernel_wait_quiescent(kernel_tracer_fd
);
2324 case LTTNG_DOMAIN_UST
:
2326 struct ltt_ust_channel
*uchan
;
2327 struct lttng_ht
*chan_ht
;
2329 chan_ht
= usess
->domain_global
.channels
;
2331 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
2332 if (uchan
== NULL
) {
2333 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2337 ret
= channel_ust_disable(usess
, domain
, uchan
);
2338 if (ret
!= LTTCOMM_OK
) {
2343 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2344 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2345 case LTTNG_DOMAIN_UST_PID
:
2346 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2349 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2360 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2362 static int cmd_enable_channel(struct ltt_session
*session
,
2363 int domain
, struct lttng_channel
*attr
)
2366 struct ltt_ust_session
*usess
= session
->ust_session
;
2367 struct lttng_ht
*chan_ht
;
2369 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
2372 case LTTNG_DOMAIN_KERNEL
:
2374 struct ltt_kernel_channel
*kchan
;
2376 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
2377 session
->kernel_session
);
2378 if (kchan
== NULL
) {
2379 ret
= channel_kernel_create(session
->kernel_session
,
2380 attr
, kernel_poll_pipe
[1]);
2382 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
2385 if (ret
!= LTTCOMM_OK
) {
2389 kernel_wait_quiescent(kernel_tracer_fd
);
2392 case LTTNG_DOMAIN_UST
:
2394 struct ltt_ust_channel
*uchan
;
2396 chan_ht
= usess
->domain_global
.channels
;
2398 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
2399 if (uchan
== NULL
) {
2400 ret
= channel_ust_create(usess
, domain
, attr
);
2402 ret
= channel_ust_enable(usess
, domain
, uchan
);
2406 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2407 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2408 case LTTNG_DOMAIN_UST_PID
:
2409 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2412 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2421 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2423 static int cmd_disable_event(struct ltt_session
*session
, int domain
,
2424 char *channel_name
, char *event_name
)
2429 case LTTNG_DOMAIN_KERNEL
:
2431 struct ltt_kernel_channel
*kchan
;
2432 struct ltt_kernel_session
*ksess
;
2434 ksess
= session
->kernel_session
;
2436 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2437 if (kchan
== NULL
) {
2438 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2442 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
2443 if (ret
!= LTTCOMM_OK
) {
2447 kernel_wait_quiescent(kernel_tracer_fd
);
2450 case LTTNG_DOMAIN_UST
:
2452 struct ltt_ust_channel
*uchan
;
2453 struct ltt_ust_session
*usess
;
2455 usess
= session
->ust_session
;
2457 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2459 if (uchan
== NULL
) {
2460 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2464 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
2465 if (ret
!= LTTCOMM_OK
) {
2469 DBG3("Disable UST event %s in channel %s completed", event_name
,
2473 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2474 case LTTNG_DOMAIN_UST_PID
:
2475 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2477 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2488 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2490 static int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
2496 case LTTNG_DOMAIN_KERNEL
:
2498 struct ltt_kernel_session
*ksess
;
2499 struct ltt_kernel_channel
*kchan
;
2501 ksess
= session
->kernel_session
;
2503 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2504 if (kchan
== NULL
) {
2505 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2509 ret
= event_kernel_disable_all(ksess
, kchan
);
2510 if (ret
!= LTTCOMM_OK
) {
2514 kernel_wait_quiescent(kernel_tracer_fd
);
2517 case LTTNG_DOMAIN_UST
:
2519 struct ltt_ust_session
*usess
;
2520 struct ltt_ust_channel
*uchan
;
2522 usess
= session
->ust_session
;
2524 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2526 if (uchan
== NULL
) {
2527 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2531 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
2536 DBG3("Disable all UST events in channel %s completed", channel_name
);
2540 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2541 case LTTNG_DOMAIN_UST_PID
:
2542 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2544 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2555 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2557 static int cmd_add_context(struct ltt_session
*session
, int domain
,
2558 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
2563 case LTTNG_DOMAIN_KERNEL
:
2564 /* Add kernel context to kernel tracer */
2565 ret
= context_kernel_add(session
->kernel_session
, ctx
,
2566 event_name
, channel_name
);
2567 if (ret
!= LTTCOMM_OK
) {
2571 case LTTNG_DOMAIN_UST
:
2573 struct ltt_ust_session
*usess
= session
->ust_session
;
2575 ret
= context_ust_add(usess
, domain
, ctx
, event_name
, channel_name
);
2576 if (ret
!= LTTCOMM_OK
) {
2581 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2582 case LTTNG_DOMAIN_UST_PID
:
2583 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2585 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2596 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2598 * TODO: currently, both events and loglevels are kept within the same
2599 * namespace for UST global registry/app registery, so if an event
2600 * happen to have the same name as the loglevel (very unlikely though),
2601 * and an attempt is made to enable/disable both in the same session,
2602 * the first to be created will be the only one allowed to exist.
2604 static int cmd_enable_event(struct ltt_session
*session
, int domain
,
2605 char *channel_name
, struct lttng_event
*event
)
2608 struct lttng_channel
*attr
;
2609 struct ltt_ust_session
*usess
= session
->ust_session
;
2612 case LTTNG_DOMAIN_KERNEL
:
2614 struct ltt_kernel_channel
*kchan
;
2616 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2617 session
->kernel_session
);
2618 if (kchan
== NULL
) {
2619 attr
= channel_new_default_attr(domain
);
2621 ret
= LTTCOMM_FATAL
;
2624 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2626 /* This call will notify the kernel thread */
2627 ret
= channel_kernel_create(session
->kernel_session
,
2628 attr
, kernel_poll_pipe
[1]);
2629 if (ret
!= LTTCOMM_OK
) {
2636 /* Get the newly created kernel channel pointer */
2637 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2638 session
->kernel_session
);
2639 if (kchan
== NULL
) {
2640 /* This sould not happen... */
2641 ret
= LTTCOMM_FATAL
;
2645 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
2647 if (ret
!= LTTCOMM_OK
) {
2651 kernel_wait_quiescent(kernel_tracer_fd
);
2654 case LTTNG_DOMAIN_UST
:
2656 struct lttng_channel
*attr
;
2657 struct ltt_ust_channel
*uchan
;
2659 /* Get channel from global UST domain */
2660 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2662 if (uchan
== NULL
) {
2663 /* Create default channel */
2664 attr
= channel_new_default_attr(domain
);
2666 ret
= LTTCOMM_FATAL
;
2669 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2670 attr
->name
[NAME_MAX
- 1] = '\0';
2672 ret
= channel_ust_create(usess
, domain
, attr
);
2673 if (ret
!= LTTCOMM_OK
) {
2679 /* Get the newly created channel reference back */
2680 uchan
= trace_ust_find_channel_by_name(
2681 usess
->domain_global
.channels
, channel_name
);
2682 if (uchan
== NULL
) {
2683 /* Something is really wrong */
2684 ret
= LTTCOMM_FATAL
;
2689 /* At this point, the session and channel exist on the tracer */
2690 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
);
2691 if (ret
!= LTTCOMM_OK
) {
2696 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2697 case LTTNG_DOMAIN_UST_PID
:
2698 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2700 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2711 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2713 static int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
2714 char *channel_name
, int event_type
)
2717 struct ltt_kernel_channel
*kchan
;
2720 case LTTNG_DOMAIN_KERNEL
:
2721 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2722 session
->kernel_session
);
2723 if (kchan
== NULL
) {
2724 /* This call will notify the kernel thread */
2725 ret
= channel_kernel_create(session
->kernel_session
, NULL
,
2726 kernel_poll_pipe
[1]);
2727 if (ret
!= LTTCOMM_OK
) {
2731 /* Get the newly created kernel channel pointer */
2732 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2733 session
->kernel_session
);
2734 if (kchan
== NULL
) {
2735 /* This sould not happen... */
2736 ret
= LTTCOMM_FATAL
;
2742 switch (event_type
) {
2743 case LTTNG_EVENT_SYSCALL
:
2744 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
2745 kchan
, kernel_tracer_fd
);
2747 case LTTNG_EVENT_TRACEPOINT
:
2749 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2750 * events already registered to the channel.
2752 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
2753 kchan
, kernel_tracer_fd
);
2755 case LTTNG_EVENT_ALL
:
2756 /* Enable syscalls and tracepoints */
2757 ret
= event_kernel_enable_all(session
->kernel_session
,
2758 kchan
, kernel_tracer_fd
);
2761 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2765 /* Manage return value */
2766 if (ret
!= LTTCOMM_OK
) {
2770 kernel_wait_quiescent(kernel_tracer_fd
);
2772 case LTTNG_DOMAIN_UST
:
2774 struct lttng_channel
*attr
;
2775 struct ltt_ust_channel
*uchan
;
2776 struct ltt_ust_session
*usess
= session
->ust_session
;
2778 /* Get channel from global UST domain */
2779 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2781 if (uchan
== NULL
) {
2782 /* Create default channel */
2783 attr
= channel_new_default_attr(domain
);
2785 ret
= LTTCOMM_FATAL
;
2788 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2789 attr
->name
[NAME_MAX
- 1] = '\0';
2791 /* Use the internal command enable channel */
2792 ret
= channel_ust_create(usess
, domain
, attr
);
2793 if (ret
!= LTTCOMM_OK
) {
2799 /* Get the newly created channel reference back */
2800 uchan
= trace_ust_find_channel_by_name(
2801 usess
->domain_global
.channels
, channel_name
);
2802 if (uchan
== NULL
) {
2803 /* Something is really wrong */
2804 ret
= LTTCOMM_FATAL
;
2809 /* At this point, the session and channel exist on the tracer */
2811 switch (event_type
) {
2812 case LTTNG_EVENT_ALL
:
2813 case LTTNG_EVENT_TRACEPOINT
:
2814 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
);
2815 if (ret
!= LTTCOMM_OK
) {
2820 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2824 /* Manage return value */
2825 if (ret
!= LTTCOMM_OK
) {
2831 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2832 case LTTNG_DOMAIN_UST_PID
:
2833 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2835 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2846 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2848 static ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
2851 ssize_t nb_events
= 0;
2854 case LTTNG_DOMAIN_KERNEL
:
2855 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2856 if (nb_events
< 0) {
2857 ret
= LTTCOMM_KERN_LIST_FAIL
;
2861 case LTTNG_DOMAIN_UST
:
2862 nb_events
= ust_app_list_events(events
);
2863 if (nb_events
< 0) {
2864 ret
= LTTCOMM_UST_LIST_FAIL
;
2869 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2876 /* Return negative value to differentiate return code */
2881 * Command LTTNG_START_TRACE processed by the client thread.
2883 static int cmd_start_trace(struct ltt_session
*session
)
2886 struct ltt_kernel_session
*ksession
;
2887 struct ltt_ust_session
*usess
;
2890 ksession
= session
->kernel_session
;
2891 usess
= session
->ust_session
;
2893 if (session
->enabled
) {
2894 ret
= LTTCOMM_UST_START_FAIL
;
2898 session
->enabled
= 1;
2900 /* Kernel tracing */
2901 if (ksession
!= NULL
) {
2902 struct ltt_kernel_channel
*kchan
;
2904 /* Open kernel metadata */
2905 if (ksession
->metadata
== NULL
) {
2906 ret
= kernel_open_metadata(ksession
, ksession
->trace_path
);
2908 ret
= LTTCOMM_KERN_META_FAIL
;
2913 /* Open kernel metadata stream */
2914 if (ksession
->metadata_stream_fd
== 0) {
2915 ret
= kernel_open_metadata_stream(ksession
);
2917 ERR("Kernel create metadata stream failed");
2918 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2923 /* For each channel */
2924 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2925 if (kchan
->stream_count
== 0) {
2926 ret
= kernel_open_channel_stream(kchan
);
2928 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2931 /* Update the stream global counter */
2932 ksession
->stream_count_global
+= ret
;
2936 /* Setup kernel consumer socket and send fds to it */
2937 ret
= init_kernel_tracing(ksession
);
2939 ret
= LTTCOMM_KERN_START_FAIL
;
2943 /* This start the kernel tracing */
2944 ret
= kernel_start_session(ksession
);
2946 ret
= LTTCOMM_KERN_START_FAIL
;
2950 /* Quiescent wait after starting trace */
2951 kernel_wait_quiescent(kernel_tracer_fd
);
2954 /* Flag session that trace should start automatically */
2956 usess
->start_trace
= 1;
2958 ret
= ust_app_start_trace_all(usess
);
2960 ret
= LTTCOMM_UST_START_FAIL
;
2972 * Command LTTNG_STOP_TRACE processed by the client thread.
2974 static int cmd_stop_trace(struct ltt_session
*session
)
2977 struct ltt_kernel_channel
*kchan
;
2978 struct ltt_kernel_session
*ksession
;
2979 struct ltt_ust_session
*usess
;
2982 ksession
= session
->kernel_session
;
2983 usess
= session
->ust_session
;
2985 if (!session
->enabled
) {
2986 ret
= LTTCOMM_UST_STOP_FAIL
;
2990 session
->enabled
= 0;
2993 if (ksession
!= NULL
) {
2994 DBG("Stop kernel tracing");
2996 /* Flush all buffers before stopping */
2997 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2999 ERR("Kernel metadata flush failed");
3002 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
3003 ret
= kernel_flush_buffer(kchan
);
3005 ERR("Kernel flush buffer error");
3009 ret
= kernel_stop_session(ksession
);
3011 ret
= LTTCOMM_KERN_STOP_FAIL
;
3015 kernel_wait_quiescent(kernel_tracer_fd
);
3019 usess
->start_trace
= 0;
3021 ret
= ust_app_stop_trace_all(usess
);
3023 ret
= LTTCOMM_UST_STOP_FAIL
;
3035 * Command LTTNG_CREATE_SESSION processed by the client thread.
3037 static int cmd_create_session(char *name
, char *path
, struct ucred
*creds
)
3041 ret
= session_create(name
, path
, creds
->uid
, creds
->gid
);
3042 if (ret
!= LTTCOMM_OK
) {
3053 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3055 static int cmd_destroy_session(struct ltt_session
*session
, char *name
)
3059 /* Clean kernel session teardown */
3060 teardown_kernel_session(session
);
3061 /* UST session teardown */
3062 teardown_ust_session(session
);
3065 * Must notify the kernel thread here to update it's poll setin order
3066 * to remove the channel(s)' fd just destroyed.
3068 ret
= notify_thread_pipe(kernel_poll_pipe
[1]);
3070 perror("write kernel poll pipe");
3073 ret
= session_destroy(session
);
3079 * Command LTTNG_CALIBRATE processed by the client thread.
3081 static int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
3086 case LTTNG_DOMAIN_KERNEL
:
3088 struct lttng_kernel_calibrate kcalibrate
;
3090 kcalibrate
.type
= calibrate
->type
;
3091 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
3093 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
3099 /* TODO: Userspace tracing */
3100 ret
= LTTCOMM_NOT_IMPLEMENTED
;
3111 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3113 static int cmd_register_consumer(struct ltt_session
*session
, int domain
,
3119 case LTTNG_DOMAIN_KERNEL
:
3120 /* Can't register a consumer if there is already one */
3121 if (session
->kernel_session
->consumer_fds_sent
!= 0) {
3122 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3126 sock
= lttcomm_connect_unix_sock(sock_path
);
3128 ret
= LTTCOMM_CONNECT_FAIL
;
3132 session
->kernel_session
->consumer_fd
= sock
;
3135 /* TODO: Userspace tracing */
3136 ret
= LTTCOMM_NOT_IMPLEMENTED
;
3147 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3149 static ssize_t
cmd_list_domains(struct ltt_session
*session
,
3150 struct lttng_domain
**domains
)
3155 if (session
->kernel_session
!= NULL
) {
3156 DBG3("Listing domains found kernel domain");
3160 if (session
->ust_session
!= NULL
) {
3161 DBG3("Listing domains found UST global domain");
3165 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
3166 if (*domains
== NULL
) {
3167 ret
= -LTTCOMM_FATAL
;
3171 if (session
->kernel_session
!= NULL
) {
3172 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
3176 if (session
->ust_session
!= NULL
) {
3177 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
3188 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3190 static ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
3191 struct lttng_channel
**channels
)
3194 ssize_t nb_chan
= 0;
3197 case LTTNG_DOMAIN_KERNEL
:
3198 if (session
->kernel_session
!= NULL
) {
3199 nb_chan
= session
->kernel_session
->channel_count
;
3201 DBG3("Number of kernel channels %zd", nb_chan
);
3203 case LTTNG_DOMAIN_UST
:
3204 if (session
->ust_session
!= NULL
) {
3205 nb_chan
= lttng_ht_get_count(
3206 session
->ust_session
->domain_global
.channels
);
3208 DBG3("Number of UST global channels %zd", nb_chan
);
3212 ret
= -LTTCOMM_NOT_IMPLEMENTED
;
3217 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
3218 if (*channels
== NULL
) {
3219 ret
= -LTTCOMM_FATAL
;
3223 list_lttng_channels(domain
, session
, *channels
);
3235 * Command LTTNG_LIST_EVENTS processed by the client thread.
3237 static ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
3238 char *channel_name
, struct lttng_event
**events
)
3241 ssize_t nb_event
= 0;
3244 case LTTNG_DOMAIN_KERNEL
:
3245 if (session
->kernel_session
!= NULL
) {
3246 nb_event
= list_lttng_kernel_events(channel_name
,
3247 session
->kernel_session
, events
);
3250 case LTTNG_DOMAIN_UST
:
3252 if (session
->ust_session
!= NULL
) {
3253 nb_event
= list_lttng_ust_global_events(channel_name
,
3254 &session
->ust_session
->domain_global
, events
);
3259 ret
= -LTTCOMM_NOT_IMPLEMENTED
;
3270 * Process the command requested by the lttng client within the command
3271 * context structure. This function make sure that the return structure (llm)
3272 * is set and ready for transmission before returning.
3274 * Return any error encountered or 0 for success.
3276 static int process_client_msg(struct command_ctx
*cmd_ctx
)
3278 int ret
= LTTCOMM_OK
;
3279 int need_tracing_session
= 1;
3281 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
3283 if (opt_no_kernel
&& cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
3284 ret
= LTTCOMM_KERN_NA
;
3289 * Check for command that don't needs to allocate a returned payload. We do
3290 * this here so we don't have to make the call for no payload at each
3293 switch(cmd_ctx
->lsm
->cmd_type
) {
3294 case LTTNG_LIST_SESSIONS
:
3295 case LTTNG_LIST_TRACEPOINTS
:
3296 case LTTNG_LIST_DOMAINS
:
3297 case LTTNG_LIST_CHANNELS
:
3298 case LTTNG_LIST_EVENTS
:
3301 /* Setup lttng message with no payload */
3302 ret
= setup_lttng_msg(cmd_ctx
, 0);
3304 /* This label does not try to unlock the session */
3305 goto init_setup_error
;
3309 /* Commands that DO NOT need a session. */
3310 switch (cmd_ctx
->lsm
->cmd_type
) {
3311 case LTTNG_CALIBRATE
:
3312 case LTTNG_CREATE_SESSION
:
3313 case LTTNG_LIST_SESSIONS
:
3314 case LTTNG_LIST_TRACEPOINTS
:
3315 need_tracing_session
= 0;
3318 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
3319 session_lock_list();
3320 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
3321 session_unlock_list();
3322 if (cmd_ctx
->session
== NULL
) {
3323 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
3324 ret
= LTTCOMM_SESS_NOT_FOUND
;
3326 /* If no session name specified */
3327 ret
= LTTCOMM_SELECT_SESS
;
3331 /* Acquire lock for the session */
3332 session_lock(cmd_ctx
->session
);
3338 * Check domain type for specific "pre-action".
3340 switch (cmd_ctx
->lsm
->domain
.type
) {
3341 case LTTNG_DOMAIN_KERNEL
:
3342 /* Kernel tracer check */
3343 if (kernel_tracer_fd
== 0) {
3344 /* Basically, load kernel tracer modules */
3345 init_kernel_tracer();
3346 if (kernel_tracer_fd
== 0) {
3347 ret
= LTTCOMM_KERN_NA
;
3352 /* Need a session for kernel command */
3353 if (need_tracing_session
) {
3354 if (cmd_ctx
->session
->kernel_session
== NULL
) {
3355 ret
= create_kernel_session(cmd_ctx
->session
);
3357 ret
= LTTCOMM_KERN_SESS_FAIL
;
3362 /* Start the kernel consumer daemon */
3363 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3364 if (kconsumer_data
.pid
== 0 &&
3365 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3366 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3367 ret
= start_consumerd(&kconsumer_data
);
3369 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3373 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3377 case LTTNG_DOMAIN_UST
:
3379 if (need_tracing_session
) {
3380 if (cmd_ctx
->session
->ust_session
== NULL
) {
3381 ret
= create_ust_session(cmd_ctx
->session
,
3382 &cmd_ctx
->lsm
->domain
);
3383 if (ret
!= LTTCOMM_OK
) {
3387 /* Start the UST consumer daemons */
3389 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
3390 if (consumerd64_bin
[0] != '\0' &&
3391 ustconsumer64_data
.pid
== 0 &&
3392 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3393 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3394 ret
= start_consumerd(&ustconsumer64_data
);
3396 ret
= LTTCOMM_UST_CONSUMER64_FAIL
;
3397 ust_consumerd64_fd
= -EINVAL
;
3401 ust_consumerd64_fd
= ustconsumer64_data
.cmd_sock
;
3403 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3406 if (consumerd32_bin
[0] != '\0' &&
3407 ustconsumer32_data
.pid
== 0 &&
3408 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3409 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3410 ret
= start_consumerd(&ustconsumer32_data
);
3412 ret
= LTTCOMM_UST_CONSUMER32_FAIL
;
3413 ust_consumerd32_fd
= -EINVAL
;
3416 ust_consumerd32_fd
= ustconsumer32_data
.cmd_sock
;
3418 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3428 * Check that the UID or GID match that of the tracing session.
3429 * The root user can interact with all sessions.
3431 if (need_tracing_session
) {
3432 if (!session_access_ok(cmd_ctx
->session
,
3433 cmd_ctx
->creds
.uid
, cmd_ctx
->creds
.gid
)) {
3434 ret
= LTTCOMM_EPERM
;
3439 /* Process by command type */
3440 switch (cmd_ctx
->lsm
->cmd_type
) {
3441 case LTTNG_ADD_CONTEXT
:
3443 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3444 cmd_ctx
->lsm
->u
.context
.channel_name
,
3445 cmd_ctx
->lsm
->u
.context
.event_name
,
3446 &cmd_ctx
->lsm
->u
.context
.ctx
);
3449 case LTTNG_DISABLE_CHANNEL
:
3451 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3452 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3455 case LTTNG_DISABLE_EVENT
:
3457 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3458 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3459 cmd_ctx
->lsm
->u
.disable
.name
);
3463 case LTTNG_DISABLE_ALL_EVENT
:
3465 DBG("Disabling all events");
3467 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3468 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3471 case LTTNG_ENABLE_CHANNEL
:
3473 ret
= cmd_enable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3474 &cmd_ctx
->lsm
->u
.channel
.chan
);
3477 case LTTNG_ENABLE_EVENT
:
3479 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3480 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3481 &cmd_ctx
->lsm
->u
.enable
.event
);
3484 case LTTNG_ENABLE_ALL_EVENT
:
3486 DBG("Enabling all events");
3488 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3489 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3490 cmd_ctx
->lsm
->u
.enable
.event
.type
);
3493 case LTTNG_LIST_TRACEPOINTS
:
3495 struct lttng_event
*events
;
3498 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3499 if (nb_events
< 0) {
3505 * Setup lttng message with payload size set to the event list size in
3506 * bytes and then copy list into the llm payload.
3508 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3514 /* Copy event list into message payload */
3515 memcpy(cmd_ctx
->llm
->payload
, events
,
3516 sizeof(struct lttng_event
) * nb_events
);
3523 case LTTNG_START_TRACE
:
3525 ret
= cmd_start_trace(cmd_ctx
->session
);
3528 case LTTNG_STOP_TRACE
:
3530 ret
= cmd_stop_trace(cmd_ctx
->session
);
3533 case LTTNG_CREATE_SESSION
:
3535 tracepoint(create_session_start
);
3536 ret
= cmd_create_session(cmd_ctx
->lsm
->session
.name
,
3537 cmd_ctx
->lsm
->session
.path
, &cmd_ctx
->creds
);
3538 tracepoint(create_session_end
);
3541 case LTTNG_DESTROY_SESSION
:
3543 tracepoint(destroy_session_start
);
3544 ret
= cmd_destroy_session(cmd_ctx
->session
,
3545 cmd_ctx
->lsm
->session
.name
);
3546 tracepoint(destroy_session_end
);
3549 case LTTNG_LIST_DOMAINS
:
3552 struct lttng_domain
*domains
;
3554 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3560 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3565 /* Copy event list into message payload */
3566 memcpy(cmd_ctx
->llm
->payload
, domains
,
3567 nb_dom
* sizeof(struct lttng_domain
));
3574 case LTTNG_LIST_CHANNELS
:
3577 struct lttng_channel
*channels
;
3579 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3580 cmd_ctx
->session
, &channels
);
3586 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3591 /* Copy event list into message payload */
3592 memcpy(cmd_ctx
->llm
->payload
, channels
,
3593 nb_chan
* sizeof(struct lttng_channel
));
3600 case LTTNG_LIST_EVENTS
:
3603 struct lttng_event
*events
= NULL
;
3605 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3606 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3612 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3617 /* Copy event list into message payload */
3618 memcpy(cmd_ctx
->llm
->payload
, events
,
3619 nb_event
* sizeof(struct lttng_event
));
3626 case LTTNG_LIST_SESSIONS
:
3628 unsigned int nr_sessions
;
3630 session_lock_list();
3631 nr_sessions
= lttng_sessions_count(cmd_ctx
->creds
.uid
, cmd_ctx
->creds
.gid
);
3632 if (nr_sessions
== 0) {
3633 ret
= LTTCOMM_NO_SESSION
;
3634 session_unlock_list();
3637 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) * nr_sessions
);
3639 session_unlock_list();
3643 /* Filled the session array */
3644 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
),
3645 cmd_ctx
->creds
.uid
, cmd_ctx
->creds
.gid
);
3647 session_unlock_list();
3652 case LTTNG_CALIBRATE
:
3654 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3655 &cmd_ctx
->lsm
->u
.calibrate
);
3658 case LTTNG_REGISTER_CONSUMER
:
3660 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3661 cmd_ctx
->lsm
->u
.reg
.path
);
3670 if (cmd_ctx
->llm
== NULL
) {
3671 DBG("Missing llm structure. Allocating one.");
3672 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3676 /* Set return code */
3677 cmd_ctx
->llm
->ret_code
= ret
;
3679 if (cmd_ctx
->session
) {
3680 session_unlock(cmd_ctx
->session
);
3687 * This thread manage all clients request using the unix client socket for
3690 static void *thread_manage_clients(void *data
)
3692 int sock
= 0, ret
, i
, pollfd
;
3693 uint32_t revents
, nb_fd
;
3694 struct command_ctx
*cmd_ctx
= NULL
;
3695 struct lttng_poll_event events
;
3697 tracepoint(sessiond_th_cli_start
);
3699 DBG("[thread] Manage client started");
3701 rcu_register_thread();
3703 ret
= lttcomm_listen_unix_sock(client_sock
);
3709 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3710 * more will be added to this poll set.
3712 ret
= create_thread_poll_set(&events
, 2);
3717 /* Add the application registration socket */
3718 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3724 * Notify parent pid that we are ready to accept command for client side.
3726 if (opt_sig_parent
) {
3727 kill(ppid
, SIGCHLD
);
3731 DBG("Accepting client command ...");
3733 tracepoint(sessiond_th_cli_poll
);
3735 nb_fd
= LTTNG_POLL_GETNB(&events
);
3737 /* Inifinite blocking call, waiting for transmission */
3738 ret
= lttng_poll_wait(&events
, -1);
3743 for (i
= 0; i
< nb_fd
; i
++) {
3744 /* Fetch once the poll data */
3745 revents
= LTTNG_POLL_GETEV(&events
, i
);
3746 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3748 /* Thread quit pipe has been closed. Killing thread. */
3749 ret
= check_thread_quit_pipe(pollfd
, revents
);
3754 /* Event on the registration socket */
3755 if (pollfd
== client_sock
) {
3756 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3757 ERR("Client socket poll error");
3763 DBG("Wait for client response");
3765 sock
= lttcomm_accept_unix_sock(client_sock
);
3770 /* Set socket option for credentials retrieval */
3771 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
3776 /* Allocate context command to process the client request */
3777 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3778 if (cmd_ctx
== NULL
) {
3779 perror("zmalloc cmd_ctx");
3783 /* Allocate data buffer for reception */
3784 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3785 if (cmd_ctx
->lsm
== NULL
) {
3786 perror("zmalloc cmd_ctx->lsm");
3790 cmd_ctx
->llm
= NULL
;
3791 cmd_ctx
->session
= NULL
;
3794 * Data is received from the lttng client. The struct
3795 * lttcomm_session_msg (lsm) contains the command and data request of
3798 DBG("Receiving data from client ...");
3799 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
3800 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
3802 DBG("Nothing recv() from client... continuing");
3808 // TODO: Validate cmd_ctx including sanity check for
3809 // security purpose.
3811 rcu_thread_online();
3813 * This function dispatch the work to the kernel or userspace tracer
3814 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3815 * informations for the client. The command context struct contains
3816 * everything this function may needs.
3818 ret
= process_client_msg(cmd_ctx
);
3819 rcu_thread_offline();
3822 * TODO: Inform client somehow of the fatal error. At
3823 * this point, ret < 0 means that a zmalloc failed
3824 * (ENOMEM). Error detected but still accept command.
3826 clean_command_ctx(&cmd_ctx
);
3830 DBG("Sending response (size: %d, retcode: %s)",
3831 cmd_ctx
->lttng_msg_size
,
3832 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3833 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3835 ERR("Failed to send data back to client");
3838 /* End of transmission */
3841 clean_command_ctx(&cmd_ctx
);
3845 DBG("Client thread dying");
3846 unlink(client_unix_sock_path
);
3850 lttng_poll_clean(&events
);
3851 clean_command_ctx(&cmd_ctx
);
3853 rcu_unregister_thread();
3859 * usage function on stderr
3861 static void usage(void)
3863 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3864 fprintf(stderr
, " -h, --help Display this usage.\n");
3865 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3866 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3867 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3868 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3869 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3870 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3871 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3872 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3873 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3874 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3875 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3876 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3877 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3878 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3879 fprintf(stderr
, " -V, --version Show version number.\n");
3880 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3881 fprintf(stderr
, " -q, --quiet No output at all.\n");
3882 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3883 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3884 fprintf(stderr
, " --no-kernel Disable kernel tracer\n");
3888 * daemon argument parsing
3890 static int parse_args(int argc
, char **argv
)
3894 static struct option long_options
[] = {
3895 { "client-sock", 1, 0, 'c' },
3896 { "apps-sock", 1, 0, 'a' },
3897 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3898 { "kconsumerd-err-sock", 1, 0, 'E' },
3899 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3900 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3901 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3902 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3903 { "consumerd32-path", 1, 0, 'u' },
3904 { "consumerd32-libdir", 1, 0, 'U' },
3905 { "consumerd64-path", 1, 0, 't' },
3906 { "consumerd64-libdir", 1, 0, 'T' },
3907 { "daemonize", 0, 0, 'd' },
3908 { "sig-parent", 0, 0, 'S' },
3909 { "help", 0, 0, 'h' },
3910 { "group", 1, 0, 'g' },
3911 { "version", 0, 0, 'V' },
3912 { "quiet", 0, 0, 'q' },
3913 { "verbose", 0, 0, 'v' },
3914 { "verbose-consumer", 0, 0, 'Z' },
3915 { "no-kernel", 0, 0, 'N' },
3920 int option_index
= 0;
3921 c
= getopt_long(argc
, argv
, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3922 long_options
, &option_index
);
3929 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3931 fprintf(stderr
, " with arg %s\n", optarg
);
3935 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3938 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3944 opt_tracing_group
= optarg
;
3950 fprintf(stdout
, "%s\n", VERSION
);
3956 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3959 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3962 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3965 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3968 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3971 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3980 /* Verbose level can increase using multiple -v */
3984 opt_verbose_consumer
+= 1;
3987 consumerd32_bin
= optarg
;
3990 consumerd32_libdir
= optarg
;
3993 consumerd64_bin
= optarg
;
3996 consumerd64_libdir
= optarg
;
3999 /* Unknown option or other error.
4000 * Error is printed by getopt, just return */
4009 * Creates the two needed socket by the daemon.
4010 * apps_sock - The communication socket for all UST apps.
4011 * client_sock - The communication of the cli tool (lttng).
4013 static int init_daemon_socket(void)
4018 old_umask
= umask(0);
4020 /* Create client tool unix socket */
4021 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
4022 if (client_sock
< 0) {
4023 ERR("Create unix sock failed: %s", client_unix_sock_path
);
4028 /* File permission MUST be 660 */
4029 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4031 ERR("Set file permissions failed: %s", client_unix_sock_path
);
4036 /* Create the application unix socket */
4037 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
4038 if (apps_sock
< 0) {
4039 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
4044 /* File permission MUST be 666 */
4045 ret
= chmod(apps_unix_sock_path
,
4046 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
4048 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
4059 * Check if the global socket is available, and if a daemon is answering at the
4060 * other side. If yes, error is returned.
4062 static int check_existing_daemon(void)
4064 if (access(client_unix_sock_path
, F_OK
) < 0 &&
4065 access(apps_unix_sock_path
, F_OK
) < 0) {
4069 /* Is there anybody out there ? */
4070 if (lttng_session_daemon_alive()) {
4078 * Set the tracing group gid onto the client socket.
4080 * Race window between mkdir and chown is OK because we are going from more
4081 * permissive (root.root) to les permissive (root.tracing).
4083 static int set_permissions(char *rundir
)
4088 gid
= allowed_group();
4090 WARN("No tracing group detected");
4095 /* Set lttng run dir */
4096 ret
= chown(rundir
, 0, gid
);
4098 ERR("Unable to set group on %s", rundir
);
4102 /* lttng client socket path */
4103 ret
= chown(client_unix_sock_path
, 0, gid
);
4105 ERR("Unable to set group on %s", client_unix_sock_path
);
4109 /* kconsumer error socket path */
4110 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
4112 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
4116 /* 64-bit ustconsumer error socket path */
4117 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, gid
);
4119 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
4123 /* 32-bit ustconsumer compat32 error socket path */
4124 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, gid
);
4126 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
4130 DBG("All permissions are set");
4137 * Create the pipe used to wake up the kernel thread.
4139 static int create_kernel_poll_pipe(void)
4141 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
4145 * Create the application command pipe to wake thread_manage_apps.
4147 static int create_apps_cmd_pipe(void)
4149 return pipe2(apps_cmd_pipe
, O_CLOEXEC
);
4153 * Create the lttng run directory needed for all global sockets and pipe.
4155 static int create_lttng_rundir(const char *rundir
)
4159 DBG3("Creating LTTng run directory: %s", rundir
);
4161 ret
= mkdir(rundir
, S_IRWXU
| S_IRWXG
);
4163 if (errno
!= EEXIST
) {
4164 ERR("Unable to create %s", rundir
);
4176 * Setup sockets and directory needed by the kconsumerd communication with the
4179 static int set_consumer_sockets(struct consumer_data
*consumer_data
,
4183 char path
[PATH_MAX
];
4185 switch (consumer_data
->type
) {
4186 case LTTNG_CONSUMER_KERNEL
:
4187 snprintf(path
, PATH_MAX
, KCONSUMERD_PATH
, rundir
);
4189 case LTTNG_CONSUMER64_UST
:
4190 snprintf(path
, PATH_MAX
, USTCONSUMERD64_PATH
, rundir
);
4192 case LTTNG_CONSUMER32_UST
:
4193 snprintf(path
, PATH_MAX
, USTCONSUMERD32_PATH
, rundir
);
4196 ERR("Consumer type unknown");
4201 DBG2("Creating consumer directory: %s", path
);
4203 ret
= mkdir(path
, S_IRWXU
| S_IRWXG
);
4205 if (errno
!= EEXIST
) {
4206 ERR("Failed to create %s", path
);
4212 /* Create the kconsumerd error unix socket */
4213 consumer_data
->err_sock
=
4214 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
4215 if (consumer_data
->err_sock
< 0) {
4216 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
4221 /* File permission MUST be 660 */
4222 ret
= chmod(consumer_data
->err_unix_sock_path
,
4223 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4225 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
4235 * Signal handler for the daemon
4237 * Simply stop all worker threads, leaving main() return gracefully after
4238 * joining all threads and calling cleanup().
4240 static void sighandler(int sig
)
4244 DBG("SIGPIPE catched");
4247 DBG("SIGINT catched");
4251 DBG("SIGTERM catched");
4260 * Setup signal handler for :
4261 * SIGINT, SIGTERM, SIGPIPE
4263 static int set_signal_handler(void)
4266 struct sigaction sa
;
4269 if ((ret
= sigemptyset(&sigset
)) < 0) {
4270 perror("sigemptyset");
4274 sa
.sa_handler
= sighandler
;
4275 sa
.sa_mask
= sigset
;
4277 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
4278 perror("sigaction");
4282 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
4283 perror("sigaction");
4287 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
4288 perror("sigaction");
4292 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4298 * Set open files limit to unlimited. This daemon can open a large number of
4299 * file descriptors in order to consumer multiple kernel traces.
4301 static void set_ulimit(void)
4306 /* The kernel does not allowed an infinite limit for open files */
4307 lim
.rlim_cur
= 65535;
4308 lim
.rlim_max
= 65535;
4310 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
4312 perror("failed to set open files limit");
4319 int main(int argc
, char **argv
)
4323 const char *home_path
;
4325 tracepoint(sessiond_boot_start
);
4326 rcu_register_thread();
4328 /* Create thread quit pipe */
4329 if ((ret
= init_thread_quit_pipe()) < 0) {
4333 setup_consumerd_path();
4335 /* Parse arguments */
4337 if ((ret
= parse_args(argc
, argv
) < 0)) {
4350 /* Check if daemon is UID = 0 */
4351 is_root
= !getuid();
4354 rundir
= strdup(LTTNG_RUNDIR
);
4356 /* Create global run dir with root access */
4357 ret
= create_lttng_rundir(rundir
);
4362 if (strlen(apps_unix_sock_path
) == 0) {
4363 snprintf(apps_unix_sock_path
, PATH_MAX
,
4364 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
4367 if (strlen(client_unix_sock_path
) == 0) {
4368 snprintf(client_unix_sock_path
, PATH_MAX
,
4369 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
4372 /* Set global SHM for ust */
4373 if (strlen(wait_shm_path
) == 0) {
4374 snprintf(wait_shm_path
, PATH_MAX
,
4375 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
4378 /* Setup kernel consumerd path */
4379 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
,
4380 KCONSUMERD_ERR_SOCK_PATH
, rundir
);
4381 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
,
4382 KCONSUMERD_CMD_SOCK_PATH
, rundir
);
4384 DBG2("Kernel consumer err path: %s",
4385 kconsumer_data
.err_unix_sock_path
);
4386 DBG2("Kernel consumer cmd path: %s",
4387 kconsumer_data
.cmd_unix_sock_path
);
4389 home_path
= get_home_dir();
4390 if (home_path
== NULL
) {
4391 /* TODO: Add --socket PATH option */
4392 ERR("Can't get HOME directory for sockets creation.");
4398 * Create rundir from home path. This will create something like
4401 ret
= asprintf(&rundir
, LTTNG_HOME_RUNDIR
, home_path
);
4407 ret
= create_lttng_rundir(rundir
);
4412 if (strlen(apps_unix_sock_path
) == 0) {
4413 snprintf(apps_unix_sock_path
, PATH_MAX
,
4414 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
4417 /* Set the cli tool unix socket path */
4418 if (strlen(client_unix_sock_path
) == 0) {
4419 snprintf(client_unix_sock_path
, PATH_MAX
,
4420 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
4423 /* Set global SHM for ust */
4424 if (strlen(wait_shm_path
) == 0) {
4425 snprintf(wait_shm_path
, PATH_MAX
,
4426 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
4430 DBG("Client socket path %s", client_unix_sock_path
);
4431 DBG("Application socket path %s", apps_unix_sock_path
);
4432 DBG("LTTng run directory path: %s", rundir
);
4434 /* 32 bits consumerd path setup */
4435 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
,
4436 USTCONSUMERD32_ERR_SOCK_PATH
, rundir
);
4437 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
,
4438 USTCONSUMERD32_CMD_SOCK_PATH
, rundir
);
4440 DBG2("UST consumer 32 bits err path: %s",
4441 ustconsumer32_data
.err_unix_sock_path
);
4442 DBG2("UST consumer 32 bits cmd path: %s",
4443 ustconsumer32_data
.cmd_unix_sock_path
);
4445 /* 64 bits consumerd path setup */
4446 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
,
4447 USTCONSUMERD64_ERR_SOCK_PATH
, rundir
);
4448 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
,
4449 USTCONSUMERD64_CMD_SOCK_PATH
, rundir
);
4451 DBG2("UST consumer 64 bits err path: %s",
4452 ustconsumer64_data
.err_unix_sock_path
);
4453 DBG2("UST consumer 64 bits cmd path: %s",
4454 ustconsumer64_data
.cmd_unix_sock_path
);
4457 * See if daemon already exist.
4459 if ((ret
= check_existing_daemon()) < 0) {
4460 ERR("Already running daemon.\n");
4462 * We do not goto exit because we must not cleanup()
4463 * because a daemon is already running.
4468 /* After this point, we can safely call cleanup() with "goto exit" */
4471 * These actions must be executed as root. We do that *after* setting up
4472 * the sockets path because we MUST make the check for another daemon using
4473 * those paths *before* trying to set the kernel consumer sockets and init
4477 ret
= set_consumer_sockets(&kconsumer_data
, rundir
);
4482 /* Setup kernel tracer */
4483 if (!opt_no_kernel
) {
4484 init_kernel_tracer();
4487 /* Set ulimit for open files */
4491 ret
= set_consumer_sockets(&ustconsumer64_data
, rundir
);
4496 ret
= set_consumer_sockets(&ustconsumer32_data
, rundir
);
4501 if ((ret
= set_signal_handler()) < 0) {
4505 /* Setup the needed unix socket */
4506 if ((ret
= init_daemon_socket()) < 0) {
4510 /* Set credentials to socket */
4511 if (is_root
&& ((ret
= set_permissions(rundir
)) < 0)) {
4515 /* Get parent pid if -S, --sig-parent is specified. */
4516 if (opt_sig_parent
) {
4520 /* Setup the kernel pipe for waking up the kernel thread */
4521 if ((ret
= create_kernel_poll_pipe()) < 0) {
4525 /* Setup the thread apps communication pipe. */
4526 if ((ret
= create_apps_cmd_pipe()) < 0) {
4530 /* Init UST command queue. */
4531 cds_wfq_init(&ust_cmd_queue
.queue
);
4533 /* Init UST app hash table */
4537 * Get session list pointer. This pointer MUST NOT be free(). This list is
4538 * statically declared in session.c
4540 session_list_ptr
= session_get_list();
4542 /* Set up max poll set size */
4543 lttng_poll_set_max_size();
4545 /* Create thread to manage the client socket */
4546 ret
= pthread_create(&client_thread
, NULL
,
4547 thread_manage_clients
, (void *) NULL
);
4549 perror("pthread_create clients");
4553 /* Create thread to dispatch registration */
4554 ret
= pthread_create(&dispatch_thread
, NULL
,
4555 thread_dispatch_ust_registration
, (void *) NULL
);
4557 perror("pthread_create dispatch");
4561 /* Create thread to manage application registration. */
4562 ret
= pthread_create(®_apps_thread
, NULL
,
4563 thread_registration_apps
, (void *) NULL
);
4565 perror("pthread_create registration");
4569 /* Create thread to manage application socket */
4570 ret
= pthread_create(&apps_thread
, NULL
,
4571 thread_manage_apps
, (void *) NULL
);
4573 perror("pthread_create apps");
4577 /* Create kernel thread to manage kernel event */
4578 ret
= pthread_create(&kernel_thread
, NULL
,
4579 thread_manage_kernel
, (void *) NULL
);
4581 perror("pthread_create kernel");
4585 tracepoint(sessiond_boot_end
);
4587 ret
= pthread_join(kernel_thread
, &status
);
4589 perror("pthread_join");
4590 goto error
; /* join error, exit without cleanup */
4594 ret
= pthread_join(apps_thread
, &status
);
4596 perror("pthread_join");
4597 goto error
; /* join error, exit without cleanup */
4601 ret
= pthread_join(reg_apps_thread
, &status
);
4603 perror("pthread_join");
4604 goto error
; /* join error, exit without cleanup */
4608 ret
= pthread_join(dispatch_thread
, &status
);
4610 perror("pthread_join");
4611 goto error
; /* join error, exit without cleanup */
4615 ret
= pthread_join(client_thread
, &status
);
4617 perror("pthread_join");
4618 goto error
; /* join error, exit without cleanup */
4621 ret
= join_consumer_thread(&kconsumer_data
);
4623 perror("join_consumer");
4624 goto error
; /* join error, exit without cleanup */
4630 * cleanup() is called when no other thread is running.
4632 rcu_thread_online();
4634 rcu_thread_offline();
4635 rcu_unregister_thread();