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
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 #include <semaphore.h>
30 #include <sys/mount.h>
31 #include <sys/resource.h>
32 #include <sys/socket.h>
34 #include <sys/types.h>
36 #include <urcu/futex.h>
40 #include <common/common.h>
41 #include <common/compat/poll.h>
42 #include <common/compat/socket.h>
43 #include <common/defaults.h>
44 #include <common/kernel-consumer/kernel-consumer.h>
45 #include <common/ust-consumer/ust-consumer.h>
47 #include "lttng-sessiond.h"
59 #define CONSUMERD_FILE "lttng-consumerd"
61 struct consumer_data
{
62 enum lttng_consumer_type type
;
64 pthread_t thread
; /* Worker thread interacting with the consumer */
67 /* Mutex to control consumerd pid assignation */
68 pthread_mutex_t pid_mutex
;
74 /* consumer error and command Unix socket path */
75 char err_unix_sock_path
[PATH_MAX
];
76 char cmd_unix_sock_path
[PATH_MAX
];
79 #include "benchmark.h"
82 const char default_home_dir
[] = DEFAULT_HOME_DIR
;
83 const char default_tracing_group
[] = DEFAULT_TRACING_GROUP
;
84 const char default_ust_sock_dir
[] = DEFAULT_UST_SOCK_DIR
;
85 const char default_global_apps_pipe
[] = DEFAULT_GLOBAL_APPS_PIPE
;
88 const char *opt_tracing_group
;
89 static int opt_sig_parent
;
90 static int opt_verbose_consumer
;
91 static int opt_daemon
;
92 static int opt_no_kernel
;
93 static int is_root
; /* Set to 1 if the daemon is running as root */
94 static pid_t ppid
; /* Parent PID for --sig-parent option */
97 /* Consumer daemon specific control data */
98 static struct consumer_data kconsumer_data
= {
99 .type
= LTTNG_CONSUMER_KERNEL
,
100 .err_unix_sock_path
= DEFAULT_KCONSUMERD_ERR_SOCK_PATH
,
101 .cmd_unix_sock_path
= DEFAULT_KCONSUMERD_CMD_SOCK_PATH
,
105 static struct consumer_data ustconsumer64_data
= {
106 .type
= LTTNG_CONSUMER64_UST
,
107 .err_unix_sock_path
= DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
,
108 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
,
112 static struct consumer_data ustconsumer32_data
= {
113 .type
= LTTNG_CONSUMER32_UST
,
114 .err_unix_sock_path
= DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
,
115 .cmd_unix_sock_path
= DEFAULT_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
= -1;
131 static int apps_sock
= -1;
132 static int kernel_tracer_fd
= -1;
133 static int kernel_poll_pipe
[2] = { -1, -1 };
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] = { -1, -1 };
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] = { -1, -1 };
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_CONSUMERD32_LIBDIR");
225 consumerd32_libdir
= libdir
;
227 libdir
= getenv("LTTNG_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 * Return group ID of the tracing group or -1 if not found.
280 static gid_t
allowed_group(void)
284 if (opt_tracing_group
) {
285 grp
= getgrnam(opt_tracing_group
);
287 grp
= getgrnam(default_tracing_group
);
297 * Init thread quit pipe.
299 * Return -1 on error or 0 if all pipes are created.
301 static int init_thread_quit_pipe(void)
305 ret
= pipe(thread_quit_pipe
);
307 PERROR("thread quit pipe");
311 for (i
= 0; i
< 2; i
++) {
312 ret
= fcntl(thread_quit_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
324 * Complete teardown of a kernel session. This free all data structure related
325 * to a kernel session and update counter.
327 static void teardown_kernel_session(struct ltt_session
*session
)
329 if (!session
->kernel_session
) {
330 DBG3("No kernel session when tearing down session");
334 DBG("Tearing down kernel session");
337 * If a custom kernel consumer was registered, close the socket before
338 * tearing down the complete kernel session structure
340 if (kconsumer_data
.cmd_sock
>= 0 &&
341 session
->kernel_session
->consumer_fd
!= kconsumer_data
.cmd_sock
) {
342 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
345 trace_kernel_destroy_session(session
->kernel_session
);
349 * Complete teardown of all UST sessions. This will free everything on his path
350 * and destroy the core essence of all ust sessions :)
352 static void teardown_ust_session(struct ltt_session
*session
)
356 if (!session
->ust_session
) {
357 DBG3("No UST session when tearing down session");
361 DBG("Tearing down UST session(s)");
363 ret
= ust_app_destroy_trace_all(session
->ust_session
);
365 ERR("Error in ust_app_destroy_trace_all");
368 trace_ust_destroy_session(session
->ust_session
);
372 * Stop all threads by closing the thread quit pipe.
374 static void stop_threads(void)
378 /* Stopping all threads */
379 DBG("Terminating all threads");
380 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
382 ERR("write error on thread quit pipe");
385 /* Dispatch thread */
386 dispatch_thread_exit
= 1;
387 futex_nto1_wake(&ust_cmd_queue
.futex
);
393 static void cleanup(void)
397 struct ltt_session
*sess
, *stmp
;
401 DBG("Removing %s directory", rundir
);
402 ret
= asprintf(&cmd
, "rm -rf %s", rundir
);
404 ERR("asprintf failed. Something is really wrong!");
407 /* Remove lttng run directory */
410 ERR("Unable to clean %s", rundir
);
414 DBG("Cleaning up all sessions");
416 /* Destroy session list mutex */
417 if (session_list_ptr
!= NULL
) {
418 pthread_mutex_destroy(&session_list_ptr
->lock
);
420 /* Cleanup ALL session */
421 cds_list_for_each_entry_safe(sess
, stmp
,
422 &session_list_ptr
->head
, list
) {
423 teardown_kernel_session(sess
);
424 teardown_ust_session(sess
);
429 DBG("Closing all UST sockets");
430 ust_app_clean_list();
432 pthread_mutex_destroy(&kconsumer_data
.pid_mutex
);
434 if (is_root
&& !opt_no_kernel
) {
435 DBG2("Closing kernel fd");
436 if (kernel_tracer_fd
>= 0) {
437 ret
= close(kernel_tracer_fd
);
442 DBG("Unloading kernel modules");
443 modprobe_remove_lttng_all();
447 * Closing all pipes used for communication between threads.
449 for (i
= 0; i
< 2; i
++) {
450 if (kernel_poll_pipe
[i
] >= 0) {
451 ret
= close(kernel_poll_pipe
[i
]);
458 for (i
= 0; i
< 2; i
++) {
459 if (thread_quit_pipe
[i
] >= 0) {
460 ret
= close(thread_quit_pipe
[i
]);
466 for (i
= 0; i
< 2; i
++) {
467 if (apps_cmd_pipe
[i
] >= 0) {
468 ret
= close(apps_cmd_pipe
[i
]);
475 /* OUTPUT BENCHMARK RESULTS */
478 if (getenv("BENCH_UST_NOTIFY")) {
479 bench_print_ust_notification();
482 if (getenv("BENCH_UST_REGISTER")) {
483 bench_print_ust_register();
484 bench_print_ust_unregister();
487 if (getenv("BENCH_BOOT_PROCESS")) {
488 bench_print_boot_process();
495 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
496 "Matthew, BEET driven development works!%c[%dm",
497 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
502 * Send data on a unix socket using the liblttsessiondcomm API.
504 * Return lttcomm error code.
506 static int send_unix_sock(int sock
, void *buf
, size_t len
)
508 /* Check valid length */
513 return lttcomm_send_unix_sock(sock
, buf
, len
);
517 * Free memory of a command context structure.
519 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
521 DBG("Clean command context structure");
523 if ((*cmd_ctx
)->llm
) {
524 free((*cmd_ctx
)->llm
);
526 if ((*cmd_ctx
)->lsm
) {
527 free((*cmd_ctx
)->lsm
);
535 * Send all stream fds of kernel channel to the consumer.
537 static int send_kconsumer_channel_streams(struct consumer_data
*consumer_data
,
538 int sock
, struct ltt_kernel_channel
*channel
,
539 uid_t uid
, gid_t gid
)
542 struct ltt_kernel_stream
*stream
;
543 struct lttcomm_consumer_msg lkm
;
545 DBG("Sending streams of channel %s to kernel consumer",
546 channel
->channel
->name
);
549 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
550 lkm
.u
.channel
.channel_key
= channel
->fd
;
551 lkm
.u
.channel
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
552 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
553 DBG("Sending channel %d to consumer", lkm
.u
.channel
.channel_key
);
554 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
556 PERROR("send consumer channel");
561 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
565 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
566 lkm
.u
.stream
.channel_key
= channel
->fd
;
567 lkm
.u
.stream
.stream_key
= stream
->fd
;
568 lkm
.u
.stream
.state
= stream
->state
;
569 lkm
.u
.stream
.output
= channel
->channel
->attr
.output
;
570 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
571 lkm
.u
.stream
.uid
= uid
;
572 lkm
.u
.stream
.gid
= gid
;
573 strncpy(lkm
.u
.stream
.path_name
, stream
->pathname
, PATH_MAX
- 1);
574 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
575 DBG("Sending stream %d to consumer", lkm
.u
.stream
.stream_key
);
576 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
578 PERROR("send consumer stream");
581 ret
= lttcomm_send_fds_unix_sock(sock
, &stream
->fd
, 1);
583 PERROR("send consumer stream ancillary data");
588 DBG("consumer channel streams sent");
597 * Send all stream fds of the kernel session to the consumer.
599 static int send_kconsumer_session_streams(struct consumer_data
*consumer_data
,
600 struct ltt_kernel_session
*session
)
603 struct ltt_kernel_channel
*chan
;
604 struct lttcomm_consumer_msg lkm
;
605 int sock
= session
->consumer_fd
;
607 DBG("Sending metadata stream fd");
609 /* Extra protection. It's NOT supposed to be set to -1 at this point */
610 if (session
->consumer_fd
< 0) {
611 session
->consumer_fd
= consumer_data
->cmd_sock
;
614 if (session
->metadata_stream_fd
>= 0) {
615 /* Send metadata channel fd */
616 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
617 lkm
.u
.channel
.channel_key
= session
->metadata
->fd
;
618 lkm
.u
.channel
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
619 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
620 DBG("Sending metadata channel %d to consumer", lkm
.u
.channel
.channel_key
);
621 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
623 PERROR("send consumer channel");
627 /* Send metadata stream fd */
628 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
629 lkm
.u
.stream
.channel_key
= session
->metadata
->fd
;
630 lkm
.u
.stream
.stream_key
= session
->metadata_stream_fd
;
631 lkm
.u
.stream
.state
= LTTNG_CONSUMER_ACTIVE_STREAM
;
632 lkm
.u
.stream
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
633 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
634 lkm
.u
.stream
.uid
= session
->uid
;
635 lkm
.u
.stream
.gid
= session
->gid
;
636 strncpy(lkm
.u
.stream
.path_name
, session
->metadata
->pathname
, PATH_MAX
- 1);
637 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
638 DBG("Sending metadata stream %d to consumer", lkm
.u
.stream
.stream_key
);
639 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
641 PERROR("send consumer stream");
644 ret
= lttcomm_send_fds_unix_sock(sock
, &session
->metadata_stream_fd
, 1);
646 PERROR("send consumer stream");
651 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
652 ret
= send_kconsumer_channel_streams(consumer_data
, sock
, chan
,
653 session
->uid
, session
->gid
);
659 DBG("consumer fds (metadata and channel streams) sent");
668 * Notify UST applications using the shm mmap futex.
670 static int notify_ust_apps(int active
)
674 DBG("Notifying applications of session daemon state: %d", active
);
676 tracepoint(ust_notify_apps_start
);
678 /* See shm.c for this call implying mmap, shm and futex calls */
679 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
680 if (wait_shm_mmap
== NULL
) {
684 /* Wake waiting process */
685 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
687 tracepoint(ust_notify_apps_stop
);
689 /* Apps notified successfully */
697 * Setup the outgoing data buffer for the response (llm) by allocating the
698 * right amount of memory and copying the original information from the lsm
701 * Return total size of the buffer pointed by buf.
703 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
709 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
710 if (cmd_ctx
->llm
== NULL
) {
716 /* Copy common data */
717 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
718 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
720 cmd_ctx
->llm
->data_size
= size
;
721 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
730 * Update the kernel poll set of all channel fd available over all tracing
731 * session. Add the wakeup pipe at the end of the set.
733 static int update_kernel_poll(struct lttng_poll_event
*events
)
736 struct ltt_session
*session
;
737 struct ltt_kernel_channel
*channel
;
739 DBG("Updating kernel poll set");
742 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
743 session_lock(session
);
744 if (session
->kernel_session
== NULL
) {
745 session_unlock(session
);
749 cds_list_for_each_entry(channel
,
750 &session
->kernel_session
->channel_list
.head
, list
) {
751 /* Add channel fd to the kernel poll set */
752 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
754 session_unlock(session
);
757 DBG("Channel fd %d added to kernel set", channel
->fd
);
759 session_unlock(session
);
761 session_unlock_list();
766 session_unlock_list();
771 * Find the channel fd from 'fd' over all tracing session. When found, check
772 * for new channel stream and send those stream fds to the kernel consumer.
774 * Useful for CPU hotplug feature.
776 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
779 struct ltt_session
*session
;
780 struct ltt_kernel_channel
*channel
;
782 DBG("Updating kernel streams for channel fd %d", fd
);
785 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
786 session_lock(session
);
787 if (session
->kernel_session
== NULL
) {
788 session_unlock(session
);
792 /* This is not suppose to be -1 but this is an extra security check */
793 if (session
->kernel_session
->consumer_fd
< 0) {
794 session
->kernel_session
->consumer_fd
= consumer_data
->cmd_sock
;
797 cds_list_for_each_entry(channel
,
798 &session
->kernel_session
->channel_list
.head
, list
) {
799 if (channel
->fd
== fd
) {
800 DBG("Channel found, updating kernel streams");
801 ret
= kernel_open_channel_stream(channel
);
807 * Have we already sent fds to the consumer? If yes, it means
808 * that tracing is started so it is safe to send our updated
811 if (session
->kernel_session
->consumer_fds_sent
== 1) {
812 ret
= send_kconsumer_channel_streams(consumer_data
,
813 session
->kernel_session
->consumer_fd
, channel
,
814 session
->uid
, session
->gid
);
822 session_unlock(session
);
824 session_unlock_list();
828 session_unlock(session
);
829 session_unlock_list();
834 * For each tracing session, update newly registered apps.
836 static void update_ust_app(int app_sock
)
838 struct ltt_session
*sess
, *stmp
;
842 /* For all tracing session(s) */
843 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
845 if (sess
->ust_session
) {
846 ust_app_global_update(sess
->ust_session
, app_sock
);
848 session_unlock(sess
);
851 session_unlock_list();
855 * This thread manage event coming from the kernel.
857 * Features supported in this thread:
860 static void *thread_manage_kernel(void *data
)
862 int ret
, i
, pollfd
, update_poll_flag
= 1;
863 uint32_t revents
, nb_fd
;
865 struct lttng_poll_event events
;
867 tracepoint(sessiond_th_kern_start
);
869 DBG("Thread manage kernel started");
871 ret
= create_thread_poll_set(&events
, 2);
873 goto error_poll_create
;
876 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
882 if (update_poll_flag
== 1) {
884 * Reset number of fd in the poll set. Always 2 since there is the thread
885 * quit pipe and the kernel pipe.
889 ret
= update_kernel_poll(&events
);
893 update_poll_flag
= 0;
896 nb_fd
= LTTNG_POLL_GETNB(&events
);
898 DBG("Thread kernel polling on %d fds", nb_fd
);
900 /* Zeroed the poll events */
901 lttng_poll_reset(&events
);
903 tracepoint(sessiond_th_kern_poll
);
905 /* Poll infinite value of time */
907 ret
= lttng_poll_wait(&events
, -1);
910 * Restart interrupted system call.
912 if (errno
== EINTR
) {
916 } else if (ret
== 0) {
917 /* Should not happen since timeout is infinite */
918 ERR("Return value of poll is 0 with an infinite timeout.\n"
919 "This should not have happened! Continuing...");
923 for (i
= 0; i
< nb_fd
; i
++) {
924 /* Fetch once the poll data */
925 revents
= LTTNG_POLL_GETEV(&events
, i
);
926 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
928 /* Thread quit pipe has been closed. Killing thread. */
929 ret
= check_thread_quit_pipe(pollfd
, revents
);
934 /* Check for data on kernel pipe */
935 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
936 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
937 update_poll_flag
= 1;
941 * New CPU detected by the kernel. Adding kernel stream to
942 * kernel session and updating the kernel consumer
944 if (revents
& LPOLLIN
) {
945 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
951 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
952 * and unregister kernel stream at this point.
960 lttng_poll_clean(&events
);
962 DBG("Kernel thread dying");
967 * This thread manage the consumer error sent back to the session daemon.
969 static void *thread_manage_consumer(void *data
)
971 int sock
= -1, i
, ret
, pollfd
;
972 uint32_t revents
, nb_fd
;
973 enum lttcomm_return_code code
;
974 struct lttng_poll_event events
;
975 struct consumer_data
*consumer_data
= data
;
977 tracepoint(sessiond_th_kcon_start
);
979 DBG("[thread] Manage consumer started");
981 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
987 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
988 * Nothing more will be added to this poll set.
990 ret
= create_thread_poll_set(&events
, 2);
995 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
1000 nb_fd
= LTTNG_POLL_GETNB(&events
);
1002 tracepoint(sessiond_th_kcon_poll
);
1004 /* Inifinite blocking call, waiting for transmission */
1006 ret
= lttng_poll_wait(&events
, -1);
1009 * Restart interrupted system call.
1011 if (errno
== EINTR
) {
1017 for (i
= 0; i
< nb_fd
; i
++) {
1018 /* Fetch once the poll data */
1019 revents
= LTTNG_POLL_GETEV(&events
, i
);
1020 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1022 /* Thread quit pipe has been closed. Killing thread. */
1023 ret
= check_thread_quit_pipe(pollfd
, revents
);
1028 /* Event on the registration socket */
1029 if (pollfd
== consumer_data
->err_sock
) {
1030 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1031 ERR("consumer err socket poll error");
1037 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
1042 DBG2("Receiving code from consumer err_sock");
1044 /* Getting status code from kconsumerd */
1045 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1046 sizeof(enum lttcomm_return_code
));
1051 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
1052 consumer_data
->cmd_sock
=
1053 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1054 if (consumer_data
->cmd_sock
< 0) {
1055 sem_post(&consumer_data
->sem
);
1056 PERROR("consumer connect");
1059 /* Signal condition to tell that the kconsumerd is ready */
1060 sem_post(&consumer_data
->sem
);
1061 DBG("consumer command socket ready");
1063 ERR("consumer error when waiting for SOCK_READY : %s",
1064 lttcomm_get_readable_code(-code
));
1068 /* Remove the kconsumerd error sock since we've established a connexion */
1069 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1074 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1079 /* Update number of fd */
1080 nb_fd
= LTTNG_POLL_GETNB(&events
);
1082 /* Inifinite blocking call, waiting for transmission */
1084 ret
= lttng_poll_wait(&events
, -1);
1087 * Restart interrupted system call.
1089 if (errno
== EINTR
) {
1095 for (i
= 0; i
< nb_fd
; i
++) {
1096 /* Fetch once the poll data */
1097 revents
= LTTNG_POLL_GETEV(&events
, i
);
1098 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1100 /* Thread quit pipe has been closed. Killing thread. */
1101 ret
= check_thread_quit_pipe(pollfd
, revents
);
1106 /* Event on the kconsumerd socket */
1107 if (pollfd
== sock
) {
1108 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1109 ERR("consumer err socket second poll error");
1115 /* Wait for any kconsumerd error */
1116 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1117 sizeof(enum lttcomm_return_code
));
1119 ERR("consumer closed the command socket");
1123 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
1126 if (consumer_data
->err_sock
>= 0) {
1127 ret
= close(consumer_data
->err_sock
);
1132 if (consumer_data
->cmd_sock
>= 0) {
1133 ret
= close(consumer_data
->cmd_sock
);
1145 unlink(consumer_data
->err_unix_sock_path
);
1146 unlink(consumer_data
->cmd_unix_sock_path
);
1147 consumer_data
->pid
= 0;
1149 lttng_poll_clean(&events
);
1152 DBG("consumer thread cleanup completed");
1158 * This thread manage application communication.
1160 static void *thread_manage_apps(void *data
)
1163 uint32_t revents
, nb_fd
;
1164 struct ust_command ust_cmd
;
1165 struct lttng_poll_event events
;
1167 tracepoint(sessiond_th_apps_start
);
1169 DBG("[thread] Manage application started");
1171 rcu_register_thread();
1172 rcu_thread_online();
1174 ret
= create_thread_poll_set(&events
, 2);
1176 goto error_poll_create
;
1179 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1185 /* Zeroed the events structure */
1186 lttng_poll_reset(&events
);
1188 nb_fd
= LTTNG_POLL_GETNB(&events
);
1190 DBG("Apps thread polling on %d fds", nb_fd
);
1192 tracepoint(sessiond_th_apps_poll
);
1194 /* Inifinite blocking call, waiting for transmission */
1196 ret
= lttng_poll_wait(&events
, -1);
1199 * Restart interrupted system call.
1201 if (errno
== EINTR
) {
1207 for (i
= 0; i
< nb_fd
; i
++) {
1208 /* Fetch once the poll data */
1209 revents
= LTTNG_POLL_GETEV(&events
, i
);
1210 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1212 /* Thread quit pipe has been closed. Killing thread. */
1213 ret
= check_thread_quit_pipe(pollfd
, revents
);
1218 /* Inspect the apps cmd pipe */
1219 if (pollfd
== apps_cmd_pipe
[0]) {
1220 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1221 ERR("Apps command pipe error");
1223 } else if (revents
& LPOLLIN
) {
1224 tracepoint(ust_register_read_start
);
1226 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1227 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1228 PERROR("read apps cmd pipe");
1231 tracepoint(ust_register_read_stop
);
1233 tracepoint(ust_register_add_start
);
1234 /* Register applicaton to the session daemon */
1235 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1237 if (ret
== -ENOMEM
) {
1239 } else if (ret
< 0) {
1242 tracepoint(ust_register_add_stop
);
1244 tracepoint(ust_register_done_start
);
1246 * Validate UST version compatibility.
1248 ret
= ust_app_validate_version(ust_cmd
.sock
);
1251 * Add channel(s) and event(s) to newly registered apps
1252 * from lttng global UST domain.
1254 update_ust_app(ust_cmd
.sock
);
1257 ret
= ust_app_register_done(ust_cmd
.sock
);
1260 * If the registration is not possible, we simply
1261 * unregister the apps and continue
1263 ust_app_unregister(ust_cmd
.sock
);
1266 * We just need here to monitor the close of the UST
1267 * socket and poll set monitor those by default.
1268 * Listen on POLLIN (even if we never expect any
1269 * data) to ensure that hangup wakes us.
1271 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, LPOLLIN
);
1276 DBG("Apps with sock %d added to poll set",
1279 tracepoint(ust_register_done_stop
);
1284 * At this point, we know that a registered application made
1285 * the event at poll_wait.
1287 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1288 tracepoint(ust_unregister_start
);
1290 /* Removing from the poll set */
1291 ret
= lttng_poll_del(&events
, pollfd
);
1296 /* Socket closed on remote end. */
1297 ust_app_unregister(pollfd
);
1299 tracepoint(ust_unregister_stop
);
1307 lttng_poll_clean(&events
);
1309 DBG("Application communication apps thread cleanup complete");
1310 rcu_thread_offline();
1311 rcu_unregister_thread();
1316 * Dispatch request from the registration threads to the application
1317 * communication thread.
1319 static void *thread_dispatch_ust_registration(void *data
)
1322 struct cds_wfq_node
*node
;
1323 struct ust_command
*ust_cmd
= NULL
;
1325 tracepoint(sessiond_th_dispatch_start
);
1327 DBG("[thread] Dispatch UST command started");
1329 while (!dispatch_thread_exit
) {
1330 /* Atomically prepare the queue futex */
1331 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1334 tracepoint(sessiond_th_dispatch_block
);
1336 /* Dequeue command for registration */
1337 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1339 DBG("Woken up but nothing in the UST command queue");
1340 /* Continue thread execution */
1344 tracepoint(ust_dispatch_register_start
);
1346 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1348 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1349 " gid:%d sock:%d name:%s (version %d.%d)",
1350 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1351 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1352 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1353 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1355 * Inform apps thread of the new application registration. This
1356 * call is blocking so we can be assured that the data will be read
1357 * at some point in time or wait to the end of the world :)
1359 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1360 sizeof(struct ust_command
));
1362 PERROR("write apps cmd pipe");
1363 if (errno
== EBADF
) {
1365 * We can't inform the application thread to process
1366 * registration. We will exit or else application
1367 * registration will not occur and tracing will never
1374 } while (node
!= NULL
);
1376 tracepoint(ust_dispatch_register_stop
);
1378 /* Futex wait on queue. Blocking call on futex() */
1379 futex_nto1_wait(&ust_cmd_queue
.futex
);
1383 DBG("Dispatch thread dying");
1388 * This thread manage application registration.
1390 static void *thread_registration_apps(void *data
)
1392 int sock
= -1, i
, ret
, pollfd
;
1393 uint32_t revents
, nb_fd
;
1394 struct lttng_poll_event events
;
1396 * Get allocated in this thread, enqueued to a global queue, dequeued and
1397 * freed in the manage apps thread.
1399 struct ust_command
*ust_cmd
= NULL
;
1401 tracepoint(sessiond_th_reg_start
);
1403 DBG("[thread] Manage application registration started");
1405 ret
= lttcomm_listen_unix_sock(apps_sock
);
1411 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1412 * more will be added to this poll set.
1414 ret
= create_thread_poll_set(&events
, 2);
1416 goto error_create_poll
;
1419 /* Add the application registration socket */
1420 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1422 goto error_poll_add
;
1425 /* Notify all applications to register */
1426 ret
= notify_ust_apps(1);
1428 ERR("Failed to notify applications or create the wait shared memory.\n"
1429 "Execution continues but there might be problem for already\n"
1430 "running applications that wishes to register.");
1434 DBG("Accepting application registration");
1436 tracepoint(sessiond_th_reg_poll
);
1438 nb_fd
= LTTNG_POLL_GETNB(&events
);
1440 /* Inifinite blocking call, waiting for transmission */
1442 ret
= lttng_poll_wait(&events
, -1);
1445 * Restart interrupted system call.
1447 if (errno
== EINTR
) {
1453 for (i
= 0; i
< nb_fd
; i
++) {
1454 /* Fetch once the poll data */
1455 revents
= LTTNG_POLL_GETEV(&events
, i
);
1456 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1458 /* Thread quit pipe has been closed. Killing thread. */
1459 ret
= check_thread_quit_pipe(pollfd
, revents
);
1464 /* Event on the registration socket */
1465 if (pollfd
== apps_sock
) {
1466 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1467 ERR("Register apps socket poll error");
1469 } else if (revents
& LPOLLIN
) {
1470 /* Registration starts here. Recording cycles */
1471 tracepoint(ust_register_start
);
1473 sock
= lttcomm_accept_unix_sock(apps_sock
);
1478 /* Create UST registration command for enqueuing */
1479 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1480 if (ust_cmd
== NULL
) {
1481 PERROR("ust command zmalloc");
1486 * Using message-based transmissions to ensure we don't
1487 * have to deal with partially received messages.
1489 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
1491 ERR("Exhausted file descriptors allowed for applications.");
1500 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1501 sizeof(struct ust_register_msg
));
1502 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1504 PERROR("lttcomm_recv_unix_sock register apps");
1506 ERR("Wrong size received on apps register");
1513 lttng_fd_put(LTTNG_FD_APPS
, 1);
1518 ust_cmd
->sock
= sock
;
1521 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1522 " gid:%d sock:%d name:%s (version %d.%d)",
1523 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1524 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1525 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1526 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1529 * Lock free enqueue the registration request. The red pill
1530 * has been taken! This apps will be part of the *system*.
1532 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1535 * Wake the registration queue futex. Implicit memory
1536 * barrier with the exchange in cds_wfq_enqueue.
1538 futex_nto1_wake(&ust_cmd_queue
.futex
);
1540 tracepoint(ust_register_stop
);
1547 /* Notify that the registration thread is gone */
1550 if (apps_sock
>= 0) {
1551 ret
= close(apps_sock
);
1561 lttng_fd_put(LTTNG_FD_APPS
, 1);
1563 unlink(apps_unix_sock_path
);
1566 lttng_poll_clean(&events
);
1569 DBG("UST Registration thread cleanup complete");
1575 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1576 * exec or it will fails.
1578 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1581 struct timespec timeout
;
1583 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1584 timeout
.tv_nsec
= 0;
1586 /* Setup semaphore */
1587 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1589 PERROR("sem_init consumer semaphore");
1593 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1594 thread_manage_consumer
, consumer_data
);
1596 PERROR("pthread_create consumer");
1601 /* Get time for sem_timedwait absolute timeout */
1602 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1604 PERROR("clock_gettime spawn consumer");
1605 /* Infinite wait for the kconsumerd thread to be ready */
1606 ret
= sem_wait(&consumer_data
->sem
);
1608 /* Normal timeout if the gettime was successful */
1609 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1610 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1614 if (errno
== ETIMEDOUT
) {
1616 * Call has timed out so we kill the kconsumerd_thread and return
1619 ERR("The consumer thread was never ready. Killing it");
1620 ret
= pthread_cancel(consumer_data
->thread
);
1622 PERROR("pthread_cancel consumer thread");
1625 PERROR("semaphore wait failed consumer thread");
1630 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1631 if (consumer_data
->pid
== 0) {
1632 ERR("Kconsumerd did not start");
1633 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1636 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1645 * Join consumer thread
1647 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1652 if (consumer_data
->pid
!= 0) {
1653 ret
= kill(consumer_data
->pid
, SIGTERM
);
1655 ERR("Error killing consumer daemon");
1658 return pthread_join(consumer_data
->thread
, &status
);
1665 * Fork and exec a consumer daemon (consumerd).
1667 * Return pid if successful else -1.
1669 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1673 const char *consumer_to_use
;
1674 const char *verbosity
;
1677 DBG("Spawning consumerd");
1684 if (opt_verbose_consumer
) {
1685 verbosity
= "--verbose";
1687 verbosity
= "--quiet";
1689 switch (consumer_data
->type
) {
1690 case LTTNG_CONSUMER_KERNEL
:
1692 * Find out which consumerd to execute. We will first try the
1693 * 64-bit path, then the sessiond's installation directory, and
1694 * fallback on the 32-bit one,
1696 DBG3("Looking for a kernel consumer at these locations:");
1697 DBG3(" 1) %s", consumerd64_bin
);
1698 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, CONSUMERD_FILE
);
1699 DBG3(" 3) %s", consumerd32_bin
);
1700 if (stat(consumerd64_bin
, &st
) == 0) {
1701 DBG3("Found location #1");
1702 consumer_to_use
= consumerd64_bin
;
1703 } else if (stat(INSTALL_BIN_PATH
"/" CONSUMERD_FILE
, &st
) == 0) {
1704 DBG3("Found location #2");
1705 consumer_to_use
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
1706 } else if (stat(consumerd32_bin
, &st
) == 0) {
1707 DBG3("Found location #3");
1708 consumer_to_use
= consumerd32_bin
;
1710 DBG("Could not find any valid consumerd executable");
1713 DBG("Using kernel consumer at: %s", consumer_to_use
);
1714 execl(consumer_to_use
,
1715 "lttng-consumerd", verbosity
, "-k",
1716 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1717 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1720 case LTTNG_CONSUMER64_UST
:
1722 char *tmpnew
= NULL
;
1724 if (consumerd64_libdir
[0] != '\0') {
1728 tmp
= getenv("LD_LIBRARY_PATH");
1732 tmplen
= strlen("LD_LIBRARY_PATH=")
1733 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
1734 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1739 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1740 strcat(tmpnew
, consumerd64_libdir
);
1741 if (tmp
[0] != '\0') {
1742 strcat(tmpnew
, ":");
1743 strcat(tmpnew
, tmp
);
1745 ret
= putenv(tmpnew
);
1751 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin
);
1752 ret
= execl(consumerd64_bin
, "lttng-consumerd", verbosity
, "-u",
1753 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1754 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1756 if (consumerd64_libdir
[0] != '\0') {
1764 case LTTNG_CONSUMER32_UST
:
1766 char *tmpnew
= NULL
;
1768 if (consumerd32_libdir
[0] != '\0') {
1772 tmp
= getenv("LD_LIBRARY_PATH");
1776 tmplen
= strlen("LD_LIBRARY_PATH=")
1777 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
1778 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1783 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1784 strcat(tmpnew
, consumerd32_libdir
);
1785 if (tmp
[0] != '\0') {
1786 strcat(tmpnew
, ":");
1787 strcat(tmpnew
, tmp
);
1789 ret
= putenv(tmpnew
);
1795 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin
);
1796 ret
= execl(consumerd32_bin
, "lttng-consumerd", verbosity
, "-u",
1797 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1798 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1800 if (consumerd32_libdir
[0] != '\0') {
1809 PERROR("unknown consumer type");
1813 PERROR("kernel start consumer exec");
1816 } else if (pid
> 0) {
1819 PERROR("start consumer fork");
1827 * Spawn the consumerd daemon and session daemon thread.
1829 static int start_consumerd(struct consumer_data
*consumer_data
)
1833 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1834 if (consumer_data
->pid
!= 0) {
1835 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1839 ret
= spawn_consumerd(consumer_data
);
1841 ERR("Spawning consumerd failed");
1842 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1846 /* Setting up the consumer_data pid */
1847 consumer_data
->pid
= ret
;
1848 DBG2("Consumer pid %d", consumer_data
->pid
);
1849 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1851 DBG2("Spawning consumer control thread");
1852 ret
= spawn_consumer_thread(consumer_data
);
1854 ERR("Fatal error spawning consumer control thread");
1866 * Check version of the lttng-modules.
1868 static int validate_lttng_modules_version(void)
1870 return kernel_validate_version(kernel_tracer_fd
);
1874 * Setup necessary data for kernel tracer action.
1876 static int init_kernel_tracer(void)
1880 /* Modprobe lttng kernel modules */
1881 ret
= modprobe_lttng_control();
1886 /* Open debugfs lttng */
1887 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
1888 if (kernel_tracer_fd
< 0) {
1889 DBG("Failed to open %s", module_proc_lttng
);
1894 /* Validate kernel version */
1895 ret
= validate_lttng_modules_version();
1900 ret
= modprobe_lttng_data();
1905 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1909 modprobe_remove_lttng_control();
1910 ret
= close(kernel_tracer_fd
);
1914 kernel_tracer_fd
= -1;
1915 return LTTCOMM_KERN_VERSION
;
1918 ret
= close(kernel_tracer_fd
);
1924 modprobe_remove_lttng_control();
1927 WARN("No kernel tracer available");
1928 kernel_tracer_fd
= -1;
1930 return LTTCOMM_NEED_ROOT_SESSIOND
;
1932 return LTTCOMM_KERN_NA
;
1937 * Init tracing by creating trace directory and sending fds kernel consumer.
1939 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
1943 if (session
->consumer_fds_sent
== 0) {
1945 * Assign default kernel consumer socket if no consumer assigned to the
1946 * kernel session. At this point, it's NOT supposed to be -1 but this is
1947 * an extra security check.
1949 if (session
->consumer_fd
< 0) {
1950 session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1953 ret
= send_kconsumer_session_streams(&kconsumer_data
, session
);
1955 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1959 session
->consumer_fds_sent
= 1;
1967 * Create an UST session and add it to the session ust list.
1969 static int create_ust_session(struct ltt_session
*session
,
1970 struct lttng_domain
*domain
)
1972 struct ltt_ust_session
*lus
= NULL
;
1975 switch (domain
->type
) {
1976 case LTTNG_DOMAIN_UST
:
1979 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1983 DBG("Creating UST session");
1985 lus
= trace_ust_create_session(session
->path
, session
->id
, domain
);
1987 ret
= LTTCOMM_UST_SESS_FAIL
;
1991 ret
= run_as_mkdir_recursive(lus
->pathname
, S_IRWXU
| S_IRWXG
,
1992 session
->uid
, session
->gid
);
1994 if (ret
!= -EEXIST
) {
1995 ERR("Trace directory creation error");
1996 ret
= LTTCOMM_UST_SESS_FAIL
;
2001 /* The domain type dictate different actions on session creation */
2002 switch (domain
->type
) {
2003 case LTTNG_DOMAIN_UST
:
2004 /* No ustctl for the global UST domain */
2007 ERR("Unknown UST domain on create session %d", domain
->type
);
2010 lus
->uid
= session
->uid
;
2011 lus
->gid
= session
->gid
;
2012 session
->ust_session
= lus
;
2022 * Create a kernel tracer session then create the default channel.
2024 static int create_kernel_session(struct ltt_session
*session
)
2028 DBG("Creating kernel session");
2030 ret
= kernel_create_session(session
, kernel_tracer_fd
);
2032 ret
= LTTCOMM_KERN_SESS_FAIL
;
2036 /* Set kernel consumer socket fd */
2037 if (kconsumer_data
.cmd_sock
>= 0) {
2038 session
->kernel_session
->consumer_fd
= kconsumer_data
.cmd_sock
;
2041 ret
= run_as_mkdir_recursive(session
->kernel_session
->trace_path
,
2042 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2044 if (ret
!= -EEXIST
) {
2045 ERR("Trace directory creation error");
2049 session
->kernel_session
->uid
= session
->uid
;
2050 session
->kernel_session
->gid
= session
->gid
;
2057 * Check if the UID or GID match the session. Root user has access to all
2060 static int session_access_ok(struct ltt_session
*session
, uid_t uid
, gid_t gid
)
2062 if (uid
!= session
->uid
&& gid
!= session
->gid
&& uid
!= 0) {
2069 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2072 struct ltt_session
*session
;
2074 DBG("Counting number of available session for UID %d GID %d",
2076 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2078 * Only list the sessions the user can control.
2080 if (!session_access_ok(session
, uid
, gid
)) {
2089 * Using the session list, filled a lttng_session array to send back to the
2090 * client for session listing.
2092 * The session list lock MUST be acquired before calling this function. Use
2093 * session_lock_list() and session_unlock_list().
2095 static void list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2099 struct ltt_session
*session
;
2101 DBG("Getting all available session for UID %d GID %d",
2104 * Iterate over session list and append data after the control struct in
2107 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2109 * Only list the sessions the user can control.
2111 if (!session_access_ok(session
, uid
, gid
)) {
2114 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
2115 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
2116 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2117 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2118 sessions
[i
].enabled
= session
->enabled
;
2124 * Fill lttng_channel array of all channels.
2126 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
2127 struct lttng_channel
*channels
)
2130 struct ltt_kernel_channel
*kchan
;
2132 DBG("Listing channels for session %s", session
->name
);
2135 case LTTNG_DOMAIN_KERNEL
:
2136 /* Kernel channels */
2137 if (session
->kernel_session
!= NULL
) {
2138 cds_list_for_each_entry(kchan
,
2139 &session
->kernel_session
->channel_list
.head
, list
) {
2140 /* Copy lttng_channel struct to array */
2141 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
2142 channels
[i
].enabled
= kchan
->enabled
;
2147 case LTTNG_DOMAIN_UST
:
2149 struct lttng_ht_iter iter
;
2150 struct ltt_ust_channel
*uchan
;
2152 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
2153 &iter
.iter
, uchan
, node
.node
) {
2154 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
2155 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
2156 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
2157 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
2158 channels
[i
].attr
.switch_timer_interval
=
2159 uchan
->attr
.switch_timer_interval
;
2160 channels
[i
].attr
.read_timer_interval
=
2161 uchan
->attr
.read_timer_interval
;
2162 channels
[i
].enabled
= uchan
->enabled
;
2163 switch (uchan
->attr
.output
) {
2164 case LTTNG_UST_MMAP
:
2166 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
2179 * Create a list of ust global domain events.
2181 static int list_lttng_ust_global_events(char *channel_name
,
2182 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
2185 unsigned int nb_event
= 0;
2186 struct lttng_ht_iter iter
;
2187 struct lttng_ht_node_str
*node
;
2188 struct ltt_ust_channel
*uchan
;
2189 struct ltt_ust_event
*uevent
;
2190 struct lttng_event
*tmp
;
2192 DBG("Listing UST global events for channel %s", channel_name
);
2196 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
2197 node
= lttng_ht_iter_get_node_str(&iter
);
2199 ret
= -LTTCOMM_UST_CHAN_NOT_FOUND
;
2203 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
2205 nb_event
+= lttng_ht_get_count(uchan
->events
);
2207 if (nb_event
== 0) {
2212 DBG3("Listing UST global %d events", nb_event
);
2214 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2216 ret
= -LTTCOMM_FATAL
;
2220 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
2221 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
2222 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2223 tmp
[i
].enabled
= uevent
->enabled
;
2224 switch (uevent
->attr
.instrumentation
) {
2225 case LTTNG_UST_TRACEPOINT
:
2226 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2228 case LTTNG_UST_PROBE
:
2229 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
2231 case LTTNG_UST_FUNCTION
:
2232 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
2235 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
2236 switch (uevent
->attr
.loglevel_type
) {
2237 case LTTNG_UST_LOGLEVEL_ALL
:
2238 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
2240 case LTTNG_UST_LOGLEVEL_RANGE
:
2241 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
2243 case LTTNG_UST_LOGLEVEL_SINGLE
:
2244 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
2259 * Fill lttng_event array of all kernel events in the channel.
2261 static int list_lttng_kernel_events(char *channel_name
,
2262 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
2265 unsigned int nb_event
;
2266 struct ltt_kernel_event
*event
;
2267 struct ltt_kernel_channel
*kchan
;
2269 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
2270 if (kchan
== NULL
) {
2271 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2275 nb_event
= kchan
->event_count
;
2277 DBG("Listing events for channel %s", kchan
->channel
->name
);
2279 if (nb_event
== 0) {
2284 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2285 if (*events
== NULL
) {
2286 ret
= LTTCOMM_FATAL
;
2290 /* Kernel channels */
2291 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
2292 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
2293 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2294 (*events
)[i
].enabled
= event
->enabled
;
2295 switch (event
->event
->instrumentation
) {
2296 case LTTNG_KERNEL_TRACEPOINT
:
2297 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2299 case LTTNG_KERNEL_KPROBE
:
2300 case LTTNG_KERNEL_KRETPROBE
:
2301 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
2302 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
2303 sizeof(struct lttng_kernel_kprobe
));
2305 case LTTNG_KERNEL_FUNCTION
:
2306 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
2307 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
2308 sizeof(struct lttng_kernel_function
));
2310 case LTTNG_KERNEL_NOOP
:
2311 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
2313 case LTTNG_KERNEL_SYSCALL
:
2314 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
2316 case LTTNG_KERNEL_ALL
:
2330 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2332 static int cmd_disable_channel(struct ltt_session
*session
,
2333 int domain
, char *channel_name
)
2336 struct ltt_ust_session
*usess
;
2338 usess
= session
->ust_session
;
2341 case LTTNG_DOMAIN_KERNEL
:
2343 ret
= channel_kernel_disable(session
->kernel_session
,
2345 if (ret
!= LTTCOMM_OK
) {
2349 kernel_wait_quiescent(kernel_tracer_fd
);
2352 case LTTNG_DOMAIN_UST
:
2354 struct ltt_ust_channel
*uchan
;
2355 struct lttng_ht
*chan_ht
;
2357 chan_ht
= usess
->domain_global
.channels
;
2359 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
2360 if (uchan
== NULL
) {
2361 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2365 ret
= channel_ust_disable(usess
, domain
, uchan
);
2366 if (ret
!= LTTCOMM_OK
) {
2372 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2373 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2374 case LTTNG_DOMAIN_UST_PID
:
2377 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2388 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2390 static int cmd_enable_channel(struct ltt_session
*session
,
2391 int domain
, struct lttng_channel
*attr
)
2394 struct ltt_ust_session
*usess
= session
->ust_session
;
2395 struct lttng_ht
*chan_ht
;
2397 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
2400 case LTTNG_DOMAIN_KERNEL
:
2402 struct ltt_kernel_channel
*kchan
;
2404 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
2405 session
->kernel_session
);
2406 if (kchan
== NULL
) {
2407 ret
= channel_kernel_create(session
->kernel_session
,
2408 attr
, kernel_poll_pipe
[1]);
2410 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
2413 if (ret
!= LTTCOMM_OK
) {
2417 kernel_wait_quiescent(kernel_tracer_fd
);
2420 case LTTNG_DOMAIN_UST
:
2422 struct ltt_ust_channel
*uchan
;
2424 chan_ht
= usess
->domain_global
.channels
;
2426 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
2427 if (uchan
== NULL
) {
2428 ret
= channel_ust_create(usess
, domain
, attr
);
2430 ret
= channel_ust_enable(usess
, domain
, uchan
);
2435 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2436 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2437 case LTTNG_DOMAIN_UST_PID
:
2440 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2449 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2451 static int cmd_disable_event(struct ltt_session
*session
, int domain
,
2452 char *channel_name
, char *event_name
)
2457 case LTTNG_DOMAIN_KERNEL
:
2459 struct ltt_kernel_channel
*kchan
;
2460 struct ltt_kernel_session
*ksess
;
2462 ksess
= session
->kernel_session
;
2464 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2465 if (kchan
== NULL
) {
2466 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2470 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
2471 if (ret
!= LTTCOMM_OK
) {
2475 kernel_wait_quiescent(kernel_tracer_fd
);
2478 case LTTNG_DOMAIN_UST
:
2480 struct ltt_ust_channel
*uchan
;
2481 struct ltt_ust_session
*usess
;
2483 usess
= session
->ust_session
;
2485 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2487 if (uchan
== NULL
) {
2488 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2492 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
2493 if (ret
!= LTTCOMM_OK
) {
2497 DBG3("Disable UST event %s in channel %s completed", event_name
,
2502 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2503 case LTTNG_DOMAIN_UST_PID
:
2504 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2518 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2520 static int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
2526 case LTTNG_DOMAIN_KERNEL
:
2528 struct ltt_kernel_session
*ksess
;
2529 struct ltt_kernel_channel
*kchan
;
2531 ksess
= session
->kernel_session
;
2533 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2534 if (kchan
== NULL
) {
2535 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2539 ret
= event_kernel_disable_all(ksess
, kchan
);
2540 if (ret
!= LTTCOMM_OK
) {
2544 kernel_wait_quiescent(kernel_tracer_fd
);
2547 case LTTNG_DOMAIN_UST
:
2549 struct ltt_ust_session
*usess
;
2550 struct ltt_ust_channel
*uchan
;
2552 usess
= session
->ust_session
;
2554 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2556 if (uchan
== NULL
) {
2557 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2561 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
2566 DBG3("Disable all UST events in channel %s completed", channel_name
);
2571 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2572 case LTTNG_DOMAIN_UST_PID
:
2573 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2587 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2589 static int cmd_add_context(struct ltt_session
*session
, int domain
,
2590 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
2595 case LTTNG_DOMAIN_KERNEL
:
2596 /* Add kernel context to kernel tracer */
2597 ret
= context_kernel_add(session
->kernel_session
, ctx
,
2598 event_name
, channel_name
);
2599 if (ret
!= LTTCOMM_OK
) {
2603 case LTTNG_DOMAIN_UST
:
2605 struct ltt_ust_session
*usess
= session
->ust_session
;
2607 ret
= context_ust_add(usess
, domain
, ctx
, event_name
, channel_name
);
2608 if (ret
!= LTTCOMM_OK
) {
2614 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2615 case LTTNG_DOMAIN_UST_PID
:
2616 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2630 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2632 static int cmd_enable_event(struct ltt_session
*session
, int domain
,
2633 char *channel_name
, struct lttng_event
*event
)
2636 struct lttng_channel
*attr
;
2637 struct ltt_ust_session
*usess
= session
->ust_session
;
2640 case LTTNG_DOMAIN_KERNEL
:
2642 struct ltt_kernel_channel
*kchan
;
2644 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2645 session
->kernel_session
);
2646 if (kchan
== NULL
) {
2647 attr
= channel_new_default_attr(domain
);
2649 ret
= LTTCOMM_FATAL
;
2652 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2654 /* This call will notify the kernel thread */
2655 ret
= channel_kernel_create(session
->kernel_session
,
2656 attr
, kernel_poll_pipe
[1]);
2657 if (ret
!= LTTCOMM_OK
) {
2664 /* Get the newly created kernel channel pointer */
2665 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2666 session
->kernel_session
);
2667 if (kchan
== NULL
) {
2668 /* This sould not happen... */
2669 ret
= LTTCOMM_FATAL
;
2673 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
2675 if (ret
!= LTTCOMM_OK
) {
2679 kernel_wait_quiescent(kernel_tracer_fd
);
2682 case LTTNG_DOMAIN_UST
:
2684 struct lttng_channel
*attr
;
2685 struct ltt_ust_channel
*uchan
;
2687 /* Get channel from global UST domain */
2688 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2690 if (uchan
== NULL
) {
2691 /* Create default channel */
2692 attr
= channel_new_default_attr(domain
);
2694 ret
= LTTCOMM_FATAL
;
2697 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2698 attr
->name
[NAME_MAX
- 1] = '\0';
2700 ret
= channel_ust_create(usess
, domain
, attr
);
2701 if (ret
!= LTTCOMM_OK
) {
2707 /* Get the newly created channel reference back */
2708 uchan
= trace_ust_find_channel_by_name(
2709 usess
->domain_global
.channels
, channel_name
);
2710 if (uchan
== NULL
) {
2711 /* Something is really wrong */
2712 ret
= LTTCOMM_FATAL
;
2717 /* At this point, the session and channel exist on the tracer */
2718 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
);
2719 if (ret
!= LTTCOMM_OK
) {
2725 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2726 case LTTNG_DOMAIN_UST_PID
:
2727 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2741 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2743 static int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
2744 char *channel_name
, int event_type
)
2747 struct ltt_kernel_channel
*kchan
;
2750 case LTTNG_DOMAIN_KERNEL
:
2751 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2752 session
->kernel_session
);
2753 if (kchan
== NULL
) {
2754 /* This call will notify the kernel thread */
2755 ret
= channel_kernel_create(session
->kernel_session
, NULL
,
2756 kernel_poll_pipe
[1]);
2757 if (ret
!= LTTCOMM_OK
) {
2761 /* Get the newly created kernel channel pointer */
2762 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2763 session
->kernel_session
);
2764 if (kchan
== NULL
) {
2765 /* This sould not happen... */
2766 ret
= LTTCOMM_FATAL
;
2772 switch (event_type
) {
2773 case LTTNG_EVENT_SYSCALL
:
2774 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
2775 kchan
, kernel_tracer_fd
);
2777 case LTTNG_EVENT_TRACEPOINT
:
2779 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2780 * events already registered to the channel.
2782 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
2783 kchan
, kernel_tracer_fd
);
2785 case LTTNG_EVENT_ALL
:
2786 /* Enable syscalls and tracepoints */
2787 ret
= event_kernel_enable_all(session
->kernel_session
,
2788 kchan
, kernel_tracer_fd
);
2791 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2795 /* Manage return value */
2796 if (ret
!= LTTCOMM_OK
) {
2800 kernel_wait_quiescent(kernel_tracer_fd
);
2802 case LTTNG_DOMAIN_UST
:
2804 struct lttng_channel
*attr
;
2805 struct ltt_ust_channel
*uchan
;
2806 struct ltt_ust_session
*usess
= session
->ust_session
;
2808 /* Get channel from global UST domain */
2809 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2811 if (uchan
== NULL
) {
2812 /* Create default channel */
2813 attr
= channel_new_default_attr(domain
);
2815 ret
= LTTCOMM_FATAL
;
2818 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2819 attr
->name
[NAME_MAX
- 1] = '\0';
2821 /* Use the internal command enable channel */
2822 ret
= channel_ust_create(usess
, domain
, attr
);
2823 if (ret
!= LTTCOMM_OK
) {
2829 /* Get the newly created channel reference back */
2830 uchan
= trace_ust_find_channel_by_name(
2831 usess
->domain_global
.channels
, channel_name
);
2832 if (uchan
== NULL
) {
2833 /* Something is really wrong */
2834 ret
= LTTCOMM_FATAL
;
2839 /* At this point, the session and channel exist on the tracer */
2841 switch (event_type
) {
2842 case LTTNG_EVENT_ALL
:
2843 case LTTNG_EVENT_TRACEPOINT
:
2844 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
);
2845 if (ret
!= LTTCOMM_OK
) {
2850 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2854 /* Manage return value */
2855 if (ret
!= LTTCOMM_OK
) {
2862 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2863 case LTTNG_DOMAIN_UST_PID
:
2864 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2878 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2880 static ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
2883 ssize_t nb_events
= 0;
2886 case LTTNG_DOMAIN_KERNEL
:
2887 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2888 if (nb_events
< 0) {
2889 ret
= LTTCOMM_KERN_LIST_FAIL
;
2893 case LTTNG_DOMAIN_UST
:
2894 nb_events
= ust_app_list_events(events
);
2895 if (nb_events
< 0) {
2896 ret
= LTTCOMM_UST_LIST_FAIL
;
2908 /* Return negative value to differentiate return code */
2913 * Command LTTNG_START_TRACE processed by the client thread.
2915 static int cmd_start_trace(struct ltt_session
*session
)
2918 struct ltt_kernel_session
*ksession
;
2919 struct ltt_ust_session
*usess
;
2922 ksession
= session
->kernel_session
;
2923 usess
= session
->ust_session
;
2925 if (session
->enabled
) {
2926 /* Already started. */
2927 ret
= LTTCOMM_TRACE_ALREADY_STARTED
;
2931 session
->enabled
= 1;
2933 /* Kernel tracing */
2934 if (ksession
!= NULL
) {
2935 struct ltt_kernel_channel
*kchan
;
2937 /* Open kernel metadata */
2938 if (ksession
->metadata
== NULL
) {
2939 ret
= kernel_open_metadata(ksession
, ksession
->trace_path
);
2941 ret
= LTTCOMM_KERN_META_FAIL
;
2946 /* Open kernel metadata stream */
2947 if (ksession
->metadata_stream_fd
< 0) {
2948 ret
= kernel_open_metadata_stream(ksession
);
2950 ERR("Kernel create metadata stream failed");
2951 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2956 /* For each channel */
2957 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2958 if (kchan
->stream_count
== 0) {
2959 ret
= kernel_open_channel_stream(kchan
);
2961 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2964 /* Update the stream global counter */
2965 ksession
->stream_count_global
+= ret
;
2969 /* Setup kernel consumer socket and send fds to it */
2970 ret
= init_kernel_tracing(ksession
);
2972 ret
= LTTCOMM_KERN_START_FAIL
;
2976 /* This start the kernel tracing */
2977 ret
= kernel_start_session(ksession
);
2979 ret
= LTTCOMM_KERN_START_FAIL
;
2983 /* Quiescent wait after starting trace */
2984 kernel_wait_quiescent(kernel_tracer_fd
);
2987 /* Flag session that trace should start automatically */
2989 usess
->start_trace
= 1;
2991 ret
= ust_app_start_trace_all(usess
);
2993 ret
= LTTCOMM_UST_START_FAIL
;
3005 * Command LTTNG_STOP_TRACE processed by the client thread.
3007 static int cmd_stop_trace(struct ltt_session
*session
)
3010 struct ltt_kernel_channel
*kchan
;
3011 struct ltt_kernel_session
*ksession
;
3012 struct ltt_ust_session
*usess
;
3015 ksession
= session
->kernel_session
;
3016 usess
= session
->ust_session
;
3018 if (!session
->enabled
) {
3019 ret
= LTTCOMM_TRACE_ALREADY_STOPPED
;
3023 session
->enabled
= 0;
3026 if (ksession
!= NULL
) {
3027 DBG("Stop kernel tracing");
3029 /* Flush all buffers before stopping */
3030 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
3032 ERR("Kernel metadata flush failed");
3035 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
3036 ret
= kernel_flush_buffer(kchan
);
3038 ERR("Kernel flush buffer error");
3042 ret
= kernel_stop_session(ksession
);
3044 ret
= LTTCOMM_KERN_STOP_FAIL
;
3048 kernel_wait_quiescent(kernel_tracer_fd
);
3052 usess
->start_trace
= 0;
3054 ret
= ust_app_stop_trace_all(usess
);
3056 ret
= LTTCOMM_UST_STOP_FAIL
;
3068 * Command LTTNG_CREATE_SESSION processed by the client thread.
3070 static int cmd_create_session(char *name
, char *path
, lttng_sock_cred
*creds
)
3074 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
3075 LTTNG_SOCK_GET_GID_CRED(creds
));
3076 if (ret
!= LTTCOMM_OK
) {
3087 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3089 static int cmd_destroy_session(struct ltt_session
*session
, char *name
)
3093 /* Clean kernel session teardown */
3094 teardown_kernel_session(session
);
3095 /* UST session teardown */
3096 teardown_ust_session(session
);
3099 * Must notify the kernel thread here to update it's poll setin order
3100 * to remove the channel(s)' fd just destroyed.
3102 ret
= notify_thread_pipe(kernel_poll_pipe
[1]);
3104 PERROR("write kernel poll pipe");
3107 ret
= session_destroy(session
);
3113 * Command LTTNG_CALIBRATE processed by the client thread.
3115 static int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
3120 case LTTNG_DOMAIN_KERNEL
:
3122 struct lttng_kernel_calibrate kcalibrate
;
3124 kcalibrate
.type
= calibrate
->type
;
3125 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
3127 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
3132 case LTTNG_DOMAIN_UST
:
3134 struct lttng_ust_calibrate ucalibrate
;
3136 ucalibrate
.type
= calibrate
->type
;
3137 ret
= ust_app_calibrate_glb(&ucalibrate
);
3139 ret
= LTTCOMM_UST_CALIBRATE_FAIL
;
3156 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3158 static int cmd_register_consumer(struct ltt_session
*session
, int domain
,
3164 case LTTNG_DOMAIN_KERNEL
:
3165 /* Can't register a consumer if there is already one */
3166 if (session
->kernel_session
->consumer_fds_sent
!= 0) {
3167 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3171 sock
= lttcomm_connect_unix_sock(sock_path
);
3173 ret
= LTTCOMM_CONNECT_FAIL
;
3177 session
->kernel_session
->consumer_fd
= sock
;
3180 /* TODO: Userspace tracing */
3192 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3194 static ssize_t
cmd_list_domains(struct ltt_session
*session
,
3195 struct lttng_domain
**domains
)
3200 if (session
->kernel_session
!= NULL
) {
3201 DBG3("Listing domains found kernel domain");
3205 if (session
->ust_session
!= NULL
) {
3206 DBG3("Listing domains found UST global domain");
3210 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
3211 if (*domains
== NULL
) {
3212 ret
= -LTTCOMM_FATAL
;
3216 if (session
->kernel_session
!= NULL
) {
3217 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
3221 if (session
->ust_session
!= NULL
) {
3222 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
3233 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3235 static ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
3236 struct lttng_channel
**channels
)
3239 ssize_t nb_chan
= 0;
3242 case LTTNG_DOMAIN_KERNEL
:
3243 if (session
->kernel_session
!= NULL
) {
3244 nb_chan
= session
->kernel_session
->channel_count
;
3246 DBG3("Number of kernel channels %zd", nb_chan
);
3248 case LTTNG_DOMAIN_UST
:
3249 if (session
->ust_session
!= NULL
) {
3250 nb_chan
= lttng_ht_get_count(
3251 session
->ust_session
->domain_global
.channels
);
3253 DBG3("Number of UST global channels %zd", nb_chan
);
3262 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
3263 if (*channels
== NULL
) {
3264 ret
= -LTTCOMM_FATAL
;
3268 list_lttng_channels(domain
, session
, *channels
);
3280 * Command LTTNG_LIST_EVENTS processed by the client thread.
3282 static ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
3283 char *channel_name
, struct lttng_event
**events
)
3286 ssize_t nb_event
= 0;
3289 case LTTNG_DOMAIN_KERNEL
:
3290 if (session
->kernel_session
!= NULL
) {
3291 nb_event
= list_lttng_kernel_events(channel_name
,
3292 session
->kernel_session
, events
);
3295 case LTTNG_DOMAIN_UST
:
3297 if (session
->ust_session
!= NULL
) {
3298 nb_event
= list_lttng_ust_global_events(channel_name
,
3299 &session
->ust_session
->domain_global
, events
);
3315 * Process the command requested by the lttng client within the command
3316 * context structure. This function make sure that the return structure (llm)
3317 * is set and ready for transmission before returning.
3319 * Return any error encountered or 0 for success.
3321 static int process_client_msg(struct command_ctx
*cmd_ctx
)
3323 int ret
= LTTCOMM_OK
;
3324 int need_tracing_session
= 1;
3327 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
3329 switch (cmd_ctx
->lsm
->cmd_type
) {
3330 case LTTNG_CREATE_SESSION
:
3331 case LTTNG_DESTROY_SESSION
:
3332 case LTTNG_LIST_SESSIONS
:
3333 case LTTNG_LIST_DOMAINS
:
3334 case LTTNG_START_TRACE
:
3335 case LTTNG_STOP_TRACE
:
3342 if (opt_no_kernel
&& need_domain
3343 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
3345 ret
= LTTCOMM_NEED_ROOT_SESSIOND
;
3347 ret
= LTTCOMM_KERN_NA
;
3353 * Check for command that don't needs to allocate a returned payload. We do
3354 * this here so we don't have to make the call for no payload at each
3357 switch(cmd_ctx
->lsm
->cmd_type
) {
3358 case LTTNG_LIST_SESSIONS
:
3359 case LTTNG_LIST_TRACEPOINTS
:
3360 case LTTNG_LIST_DOMAINS
:
3361 case LTTNG_LIST_CHANNELS
:
3362 case LTTNG_LIST_EVENTS
:
3365 /* Setup lttng message with no payload */
3366 ret
= setup_lttng_msg(cmd_ctx
, 0);
3368 /* This label does not try to unlock the session */
3369 goto init_setup_error
;
3373 /* Commands that DO NOT need a session. */
3374 switch (cmd_ctx
->lsm
->cmd_type
) {
3375 case LTTNG_CREATE_SESSION
:
3376 case LTTNG_CALIBRATE
:
3377 case LTTNG_LIST_SESSIONS
:
3378 case LTTNG_LIST_TRACEPOINTS
:
3379 need_tracing_session
= 0;
3382 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
3384 * We keep the session list lock across _all_ commands
3385 * for now, because the per-session lock does not
3386 * handle teardown properly.
3388 session_lock_list();
3389 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
3390 if (cmd_ctx
->session
== NULL
) {
3391 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
3392 ret
= LTTCOMM_SESS_NOT_FOUND
;
3394 /* If no session name specified */
3395 ret
= LTTCOMM_SELECT_SESS
;
3399 /* Acquire lock for the session */
3400 session_lock(cmd_ctx
->session
);
3409 * Check domain type for specific "pre-action".
3411 switch (cmd_ctx
->lsm
->domain
.type
) {
3412 case LTTNG_DOMAIN_KERNEL
:
3414 ret
= LTTCOMM_NEED_ROOT_SESSIOND
;
3418 /* Kernel tracer check */
3419 if (kernel_tracer_fd
== -1) {
3420 /* Basically, load kernel tracer modules */
3421 ret
= init_kernel_tracer();
3427 /* Need a session for kernel command */
3428 if (need_tracing_session
) {
3429 if (cmd_ctx
->session
->kernel_session
== NULL
) {
3430 ret
= create_kernel_session(cmd_ctx
->session
);
3432 ret
= LTTCOMM_KERN_SESS_FAIL
;
3437 /* Start the kernel consumer daemon */
3438 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3439 if (kconsumer_data
.pid
== 0 &&
3440 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3441 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3442 ret
= start_consumerd(&kconsumer_data
);
3444 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3448 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3452 case LTTNG_DOMAIN_UST
:
3454 if (need_tracing_session
) {
3455 if (cmd_ctx
->session
->ust_session
== NULL
) {
3456 ret
= create_ust_session(cmd_ctx
->session
,
3457 &cmd_ctx
->lsm
->domain
);
3458 if (ret
!= LTTCOMM_OK
) {
3462 /* Start the UST consumer daemons */
3464 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
3465 if (consumerd64_bin
[0] != '\0' &&
3466 ustconsumer64_data
.pid
== 0 &&
3467 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3468 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3469 ret
= start_consumerd(&ustconsumer64_data
);
3471 ret
= LTTCOMM_UST_CONSUMER64_FAIL
;
3472 ust_consumerd64_fd
= -EINVAL
;
3476 ust_consumerd64_fd
= ustconsumer64_data
.cmd_sock
;
3478 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3481 if (consumerd32_bin
[0] != '\0' &&
3482 ustconsumer32_data
.pid
== 0 &&
3483 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3484 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3485 ret
= start_consumerd(&ustconsumer32_data
);
3487 ret
= LTTCOMM_UST_CONSUMER32_FAIL
;
3488 ust_consumerd32_fd
= -EINVAL
;
3491 ust_consumerd32_fd
= ustconsumer32_data
.cmd_sock
;
3493 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3504 * Check that the UID or GID match that of the tracing session.
3505 * The root user can interact with all sessions.
3507 if (need_tracing_session
) {
3508 if (!session_access_ok(cmd_ctx
->session
,
3509 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3510 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
3511 ret
= LTTCOMM_EPERM
;
3516 /* Process by command type */
3517 switch (cmd_ctx
->lsm
->cmd_type
) {
3518 case LTTNG_ADD_CONTEXT
:
3520 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3521 cmd_ctx
->lsm
->u
.context
.channel_name
,
3522 cmd_ctx
->lsm
->u
.context
.event_name
,
3523 &cmd_ctx
->lsm
->u
.context
.ctx
);
3526 case LTTNG_DISABLE_CHANNEL
:
3528 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3529 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3532 case LTTNG_DISABLE_EVENT
:
3534 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3535 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3536 cmd_ctx
->lsm
->u
.disable
.name
);
3539 case LTTNG_DISABLE_ALL_EVENT
:
3541 DBG("Disabling all events");
3543 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3544 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3547 case LTTNG_ENABLE_CHANNEL
:
3549 ret
= cmd_enable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3550 &cmd_ctx
->lsm
->u
.channel
.chan
);
3553 case LTTNG_ENABLE_EVENT
:
3555 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3556 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3557 &cmd_ctx
->lsm
->u
.enable
.event
);
3560 case LTTNG_ENABLE_ALL_EVENT
:
3562 DBG("Enabling all events");
3564 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3565 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3566 cmd_ctx
->lsm
->u
.enable
.event
.type
);
3569 case LTTNG_LIST_TRACEPOINTS
:
3571 struct lttng_event
*events
;
3574 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3575 if (nb_events
< 0) {
3581 * Setup lttng message with payload size set to the event list size in
3582 * bytes and then copy list into the llm payload.
3584 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3590 /* Copy event list into message payload */
3591 memcpy(cmd_ctx
->llm
->payload
, events
,
3592 sizeof(struct lttng_event
) * nb_events
);
3599 case LTTNG_START_TRACE
:
3601 ret
= cmd_start_trace(cmd_ctx
->session
);
3604 case LTTNG_STOP_TRACE
:
3606 ret
= cmd_stop_trace(cmd_ctx
->session
);
3609 case LTTNG_CREATE_SESSION
:
3611 tracepoint(create_session_start
);
3612 ret
= cmd_create_session(cmd_ctx
->lsm
->session
.name
,
3613 cmd_ctx
->lsm
->session
.path
, &cmd_ctx
->creds
);
3614 tracepoint(create_session_end
);
3617 case LTTNG_DESTROY_SESSION
:
3619 tracepoint(destroy_session_start
);
3620 ret
= cmd_destroy_session(cmd_ctx
->session
,
3621 cmd_ctx
->lsm
->session
.name
);
3622 tracepoint(destroy_session_end
);
3624 * Set session to NULL so we do not unlock it after
3627 cmd_ctx
->session
= NULL
;
3630 case LTTNG_LIST_DOMAINS
:
3633 struct lttng_domain
*domains
;
3635 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3641 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3646 /* Copy event list into message payload */
3647 memcpy(cmd_ctx
->llm
->payload
, domains
,
3648 nb_dom
* sizeof(struct lttng_domain
));
3655 case LTTNG_LIST_CHANNELS
:
3658 struct lttng_channel
*channels
;
3660 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3661 cmd_ctx
->session
, &channels
);
3667 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3672 /* Copy event list into message payload */
3673 memcpy(cmd_ctx
->llm
->payload
, channels
,
3674 nb_chan
* sizeof(struct lttng_channel
));
3681 case LTTNG_LIST_EVENTS
:
3684 struct lttng_event
*events
= NULL
;
3686 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3687 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3693 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3698 /* Copy event list into message payload */
3699 memcpy(cmd_ctx
->llm
->payload
, events
,
3700 nb_event
* sizeof(struct lttng_event
));
3707 case LTTNG_LIST_SESSIONS
:
3709 unsigned int nr_sessions
;
3711 session_lock_list();
3712 nr_sessions
= lttng_sessions_count(
3713 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3714 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3716 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) * nr_sessions
);
3718 session_unlock_list();
3722 /* Filled the session array */
3723 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
),
3724 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3725 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3727 session_unlock_list();
3732 case LTTNG_CALIBRATE
:
3734 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3735 &cmd_ctx
->lsm
->u
.calibrate
);
3738 case LTTNG_REGISTER_CONSUMER
:
3740 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3741 cmd_ctx
->lsm
->u
.reg
.path
);
3750 if (cmd_ctx
->llm
== NULL
) {
3751 DBG("Missing llm structure. Allocating one.");
3752 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3756 /* Set return code */
3757 cmd_ctx
->llm
->ret_code
= ret
;
3759 if (cmd_ctx
->session
) {
3760 session_unlock(cmd_ctx
->session
);
3762 if (need_tracing_session
) {
3763 session_unlock_list();
3770 * This thread manage all clients request using the unix client socket for
3773 static void *thread_manage_clients(void *data
)
3775 int sock
= -1, ret
, i
, pollfd
;
3776 uint32_t revents
, nb_fd
;
3777 struct command_ctx
*cmd_ctx
= NULL
;
3778 struct lttng_poll_event events
;
3780 tracepoint(sessiond_th_cli_start
);
3782 DBG("[thread] Manage client started");
3784 rcu_register_thread();
3786 ret
= lttcomm_listen_unix_sock(client_sock
);
3792 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3793 * more will be added to this poll set.
3795 ret
= create_thread_poll_set(&events
, 2);
3800 /* Add the application registration socket */
3801 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3807 * Notify parent pid that we are ready to accept command for client side.
3809 if (opt_sig_parent
) {
3810 kill(ppid
, SIGUSR1
);
3814 DBG("Accepting client command ...");
3816 tracepoint(sessiond_th_cli_poll
);
3818 nb_fd
= LTTNG_POLL_GETNB(&events
);
3820 /* Inifinite blocking call, waiting for transmission */
3822 ret
= lttng_poll_wait(&events
, -1);
3825 * Restart interrupted system call.
3827 if (errno
== EINTR
) {
3833 for (i
= 0; i
< nb_fd
; i
++) {
3834 /* Fetch once the poll data */
3835 revents
= LTTNG_POLL_GETEV(&events
, i
);
3836 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3838 /* Thread quit pipe has been closed. Killing thread. */
3839 ret
= check_thread_quit_pipe(pollfd
, revents
);
3844 /* Event on the registration socket */
3845 if (pollfd
== client_sock
) {
3846 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3847 ERR("Client socket poll error");
3853 DBG("Wait for client response");
3855 sock
= lttcomm_accept_unix_sock(client_sock
);
3860 /* Set socket option for credentials retrieval */
3861 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
3866 /* Allocate context command to process the client request */
3867 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3868 if (cmd_ctx
== NULL
) {
3869 PERROR("zmalloc cmd_ctx");
3873 /* Allocate data buffer for reception */
3874 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3875 if (cmd_ctx
->lsm
== NULL
) {
3876 PERROR("zmalloc cmd_ctx->lsm");
3880 cmd_ctx
->llm
= NULL
;
3881 cmd_ctx
->session
= NULL
;
3884 * Data is received from the lttng client. The struct
3885 * lttcomm_session_msg (lsm) contains the command and data request of
3888 DBG("Receiving data from client ...");
3889 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
3890 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
3892 DBG("Nothing recv() from client... continuing");
3898 clean_command_ctx(&cmd_ctx
);
3902 // TODO: Validate cmd_ctx including sanity check for
3903 // security purpose.
3905 rcu_thread_online();
3907 * This function dispatch the work to the kernel or userspace tracer
3908 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3909 * informations for the client. The command context struct contains
3910 * everything this function may needs.
3912 ret
= process_client_msg(cmd_ctx
);
3913 rcu_thread_offline();
3916 * TODO: Inform client somehow of the fatal error. At
3917 * this point, ret < 0 means that a zmalloc failed
3918 * (ENOMEM). Error detected but still accept command.
3920 clean_command_ctx(&cmd_ctx
);
3924 DBG("Sending response (size: %d, retcode: %s)",
3925 cmd_ctx
->lttng_msg_size
,
3926 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3927 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3929 ERR("Failed to send data back to client");
3932 /* End of transmission */
3939 clean_command_ctx(&cmd_ctx
);
3943 DBG("Client thread dying");
3944 unlink(client_unix_sock_path
);
3945 if (client_sock
>= 0) {
3946 ret
= close(client_sock
);
3958 lttng_poll_clean(&events
);
3959 clean_command_ctx(&cmd_ctx
);
3961 rcu_unregister_thread();
3967 * usage function on stderr
3969 static void usage(void)
3971 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3972 fprintf(stderr
, " -h, --help Display this usage.\n");
3973 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3974 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3975 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3976 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3977 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3978 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3979 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3980 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3981 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3982 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3983 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3984 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3985 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3986 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3987 fprintf(stderr
, " -V, --version Show version number.\n");
3988 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3989 fprintf(stderr
, " -q, --quiet No output at all.\n");
3990 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3991 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3992 fprintf(stderr
, " --no-kernel Disable kernel tracer\n");
3996 * daemon argument parsing
3998 static int parse_args(int argc
, char **argv
)
4002 static struct option long_options
[] = {
4003 { "client-sock", 1, 0, 'c' },
4004 { "apps-sock", 1, 0, 'a' },
4005 { "kconsumerd-cmd-sock", 1, 0, 'C' },
4006 { "kconsumerd-err-sock", 1, 0, 'E' },
4007 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
4008 { "ustconsumerd32-err-sock", 1, 0, 'H' },
4009 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
4010 { "ustconsumerd64-err-sock", 1, 0, 'F' },
4011 { "consumerd32-path", 1, 0, 'u' },
4012 { "consumerd32-libdir", 1, 0, 'U' },
4013 { "consumerd64-path", 1, 0, 't' },
4014 { "consumerd64-libdir", 1, 0, 'T' },
4015 { "daemonize", 0, 0, 'd' },
4016 { "sig-parent", 0, 0, 'S' },
4017 { "help", 0, 0, 'h' },
4018 { "group", 1, 0, 'g' },
4019 { "version", 0, 0, 'V' },
4020 { "quiet", 0, 0, 'q' },
4021 { "verbose", 0, 0, 'v' },
4022 { "verbose-consumer", 0, 0, 'Z' },
4023 { "no-kernel", 0, 0, 'N' },
4028 int option_index
= 0;
4029 c
= getopt_long(argc
, argv
, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
4030 long_options
, &option_index
);
4037 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
4039 fprintf(stderr
, " with arg %s\n", optarg
);
4043 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4046 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4052 opt_tracing_group
= optarg
;
4058 fprintf(stdout
, "%s\n", VERSION
);
4064 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4067 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4070 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4073 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4076 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4079 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4085 lttng_opt_quiet
= 1;
4088 /* Verbose level can increase using multiple -v */
4089 lttng_opt_verbose
+= 1;
4092 opt_verbose_consumer
+= 1;
4095 consumerd32_bin
= optarg
;
4098 consumerd32_libdir
= optarg
;
4101 consumerd64_bin
= optarg
;
4104 consumerd64_libdir
= optarg
;
4107 /* Unknown option or other error.
4108 * Error is printed by getopt, just return */
4117 * Creates the two needed socket by the daemon.
4118 * apps_sock - The communication socket for all UST apps.
4119 * client_sock - The communication of the cli tool (lttng).
4121 static int init_daemon_socket(void)
4126 old_umask
= umask(0);
4128 /* Create client tool unix socket */
4129 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
4130 if (client_sock
< 0) {
4131 ERR("Create unix sock failed: %s", client_unix_sock_path
);
4136 /* File permission MUST be 660 */
4137 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4139 ERR("Set file permissions failed: %s", client_unix_sock_path
);
4144 /* Create the application unix socket */
4145 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
4146 if (apps_sock
< 0) {
4147 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
4152 /* File permission MUST be 666 */
4153 ret
= chmod(apps_unix_sock_path
,
4154 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
4156 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
4167 * Check if the global socket is available, and if a daemon is answering at the
4168 * other side. If yes, error is returned.
4170 static int check_existing_daemon(void)
4172 /* Is there anybody out there ? */
4173 if (lttng_session_daemon_alive()) {
4181 * Set the tracing group gid onto the client socket.
4183 * Race window between mkdir and chown is OK because we are going from more
4184 * permissive (root.root) to less permissive (root.tracing).
4186 static int set_permissions(char *rundir
)
4191 gid
= allowed_group();
4193 WARN("No tracing group detected");
4198 /* Set lttng run dir */
4199 ret
= chown(rundir
, 0, gid
);
4201 ERR("Unable to set group on %s", rundir
);
4205 /* Ensure tracing group can search the run dir */
4206 ret
= chmod(rundir
, S_IRWXU
| S_IXGRP
| S_IXOTH
);
4208 ERR("Unable to set permissions on %s", rundir
);
4212 /* lttng client socket path */
4213 ret
= chown(client_unix_sock_path
, 0, gid
);
4215 ERR("Unable to set group on %s", client_unix_sock_path
);
4219 /* kconsumer error socket path */
4220 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
4222 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
4226 /* 64-bit ustconsumer error socket path */
4227 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, gid
);
4229 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
4233 /* 32-bit ustconsumer compat32 error socket path */
4234 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, gid
);
4236 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
4240 DBG("All permissions are set");
4247 * Create the pipe used to wake up the kernel thread.
4248 * Closed in cleanup().
4250 static int create_kernel_poll_pipe(void)
4254 ret
= pipe(kernel_poll_pipe
);
4256 PERROR("kernel poll pipe");
4260 for (i
= 0; i
< 2; i
++) {
4261 ret
= fcntl(kernel_poll_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
4263 PERROR("fcntl kernel_poll_pipe");
4273 * Create the application command pipe to wake thread_manage_apps.
4274 * Closed in cleanup().
4276 static int create_apps_cmd_pipe(void)
4280 ret
= pipe(apps_cmd_pipe
);
4282 PERROR("apps cmd pipe");
4286 for (i
= 0; i
< 2; i
++) {
4287 ret
= fcntl(apps_cmd_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
4289 PERROR("fcntl apps_cmd_pipe");
4299 * Create the lttng run directory needed for all global sockets and pipe.
4301 static int create_lttng_rundir(const char *rundir
)
4305 DBG3("Creating LTTng run directory: %s", rundir
);
4307 ret
= mkdir(rundir
, S_IRWXU
);
4309 if (errno
!= EEXIST
) {
4310 ERR("Unable to create %s", rundir
);
4322 * Setup sockets and directory needed by the kconsumerd communication with the
4325 static int set_consumer_sockets(struct consumer_data
*consumer_data
,
4329 char path
[PATH_MAX
];
4331 switch (consumer_data
->type
) {
4332 case LTTNG_CONSUMER_KERNEL
:
4333 snprintf(path
, PATH_MAX
, DEFAULT_KCONSUMERD_PATH
, rundir
);
4335 case LTTNG_CONSUMER64_UST
:
4336 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD64_PATH
, rundir
);
4338 case LTTNG_CONSUMER32_UST
:
4339 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD32_PATH
, rundir
);
4342 ERR("Consumer type unknown");
4347 DBG2("Creating consumer directory: %s", path
);
4349 ret
= mkdir(path
, S_IRWXU
);
4351 if (errno
!= EEXIST
) {
4353 ERR("Failed to create %s", path
);
4359 /* Create the kconsumerd error unix socket */
4360 consumer_data
->err_sock
=
4361 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
4362 if (consumer_data
->err_sock
< 0) {
4363 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
4368 /* File permission MUST be 660 */
4369 ret
= chmod(consumer_data
->err_unix_sock_path
,
4370 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4372 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
4382 * Signal handler for the daemon
4384 * Simply stop all worker threads, leaving main() return gracefully after
4385 * joining all threads and calling cleanup().
4387 static void sighandler(int sig
)
4391 DBG("SIGPIPE caught");
4394 DBG("SIGINT caught");
4398 DBG("SIGTERM caught");
4407 * Setup signal handler for :
4408 * SIGINT, SIGTERM, SIGPIPE
4410 static int set_signal_handler(void)
4413 struct sigaction sa
;
4416 if ((ret
= sigemptyset(&sigset
)) < 0) {
4417 PERROR("sigemptyset");
4421 sa
.sa_handler
= sighandler
;
4422 sa
.sa_mask
= sigset
;
4424 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
4425 PERROR("sigaction");
4429 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
4430 PERROR("sigaction");
4434 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
4435 PERROR("sigaction");
4439 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4445 * Set open files limit to unlimited. This daemon can open a large number of
4446 * file descriptors in order to consumer multiple kernel traces.
4448 static void set_ulimit(void)
4453 /* The kernel does not allowed an infinite limit for open files */
4454 lim
.rlim_cur
= 65535;
4455 lim
.rlim_max
= 65535;
4457 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
4459 PERROR("failed to set open files limit");
4466 int main(int argc
, char **argv
)
4470 const char *home_path
;
4472 tracepoint(sessiond_boot_start
);
4474 init_kernel_workarounds();
4476 rcu_register_thread();
4478 /* Create thread quit pipe */
4479 if ((ret
= init_thread_quit_pipe()) < 0) {
4483 setup_consumerd_path();
4485 /* Parse arguments */
4487 if ((ret
= parse_args(argc
, argv
) < 0)) {
4500 /* Check if daemon is UID = 0 */
4501 is_root
= !getuid();
4504 rundir
= strdup(DEFAULT_LTTNG_RUNDIR
);
4506 /* Create global run dir with root access */
4507 ret
= create_lttng_rundir(rundir
);
4512 if (strlen(apps_unix_sock_path
) == 0) {
4513 snprintf(apps_unix_sock_path
, PATH_MAX
,
4514 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
4517 if (strlen(client_unix_sock_path
) == 0) {
4518 snprintf(client_unix_sock_path
, PATH_MAX
,
4519 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
4522 /* Set global SHM for ust */
4523 if (strlen(wait_shm_path
) == 0) {
4524 snprintf(wait_shm_path
, PATH_MAX
,
4525 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
4528 /* Setup kernel consumerd path */
4529 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
,
4530 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
, rundir
);
4531 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
,
4532 DEFAULT_KCONSUMERD_CMD_SOCK_PATH
, rundir
);
4534 DBG2("Kernel consumer err path: %s",
4535 kconsumer_data
.err_unix_sock_path
);
4536 DBG2("Kernel consumer cmd path: %s",
4537 kconsumer_data
.cmd_unix_sock_path
);
4539 home_path
= get_home_dir();
4540 if (home_path
== NULL
) {
4541 /* TODO: Add --socket PATH option */
4542 ERR("Can't get HOME directory for sockets creation.");
4548 * Create rundir from home path. This will create something like
4551 ret
= asprintf(&rundir
, DEFAULT_LTTNG_HOME_RUNDIR
, home_path
);
4557 ret
= create_lttng_rundir(rundir
);
4562 if (strlen(apps_unix_sock_path
) == 0) {
4563 snprintf(apps_unix_sock_path
, PATH_MAX
,
4564 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
4567 /* Set the cli tool unix socket path */
4568 if (strlen(client_unix_sock_path
) == 0) {
4569 snprintf(client_unix_sock_path
, PATH_MAX
,
4570 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
4573 /* Set global SHM for ust */
4574 if (strlen(wait_shm_path
) == 0) {
4575 snprintf(wait_shm_path
, PATH_MAX
,
4576 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
4580 DBG("Client socket path %s", client_unix_sock_path
);
4581 DBG("Application socket path %s", apps_unix_sock_path
);
4582 DBG("LTTng run directory path: %s", rundir
);
4584 /* 32 bits consumerd path setup */
4585 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
,
4586 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, rundir
);
4587 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
,
4588 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, rundir
);
4590 DBG2("UST consumer 32 bits err path: %s",
4591 ustconsumer32_data
.err_unix_sock_path
);
4592 DBG2("UST consumer 32 bits cmd path: %s",
4593 ustconsumer32_data
.cmd_unix_sock_path
);
4595 /* 64 bits consumerd path setup */
4596 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
,
4597 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, rundir
);
4598 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
,
4599 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, rundir
);
4601 DBG2("UST consumer 64 bits err path: %s",
4602 ustconsumer64_data
.err_unix_sock_path
);
4603 DBG2("UST consumer 64 bits cmd path: %s",
4604 ustconsumer64_data
.cmd_unix_sock_path
);
4607 * See if daemon already exist.
4609 if ((ret
= check_existing_daemon()) < 0) {
4610 ERR("Already running daemon.\n");
4612 * We do not goto exit because we must not cleanup()
4613 * because a daemon is already running.
4619 * Init UST app hash table. Alloc hash table before this point since
4620 * cleanup() can get called after that point.
4624 /* After this point, we can safely call cleanup() with "goto exit" */
4627 * These actions must be executed as root. We do that *after* setting up
4628 * the sockets path because we MUST make the check for another daemon using
4629 * those paths *before* trying to set the kernel consumer sockets and init
4633 ret
= set_consumer_sockets(&kconsumer_data
, rundir
);
4638 /* Setup kernel tracer */
4639 if (!opt_no_kernel
) {
4640 init_kernel_tracer();
4643 /* Set ulimit for open files */
4646 /* init lttng_fd tracking must be done after set_ulimit. */
4649 ret
= set_consumer_sockets(&ustconsumer64_data
, rundir
);
4654 ret
= set_consumer_sockets(&ustconsumer32_data
, rundir
);
4659 if ((ret
= set_signal_handler()) < 0) {
4663 /* Setup the needed unix socket */
4664 if ((ret
= init_daemon_socket()) < 0) {
4668 /* Set credentials to socket */
4669 if (is_root
&& ((ret
= set_permissions(rundir
)) < 0)) {
4673 /* Get parent pid if -S, --sig-parent is specified. */
4674 if (opt_sig_parent
) {
4678 /* Setup the kernel pipe for waking up the kernel thread */
4679 if ((ret
= create_kernel_poll_pipe()) < 0) {
4683 /* Setup the thread apps communication pipe. */
4684 if ((ret
= create_apps_cmd_pipe()) < 0) {
4688 /* Init UST command queue. */
4689 cds_wfq_init(&ust_cmd_queue
.queue
);
4692 * Get session list pointer. This pointer MUST NOT be free(). This list is
4693 * statically declared in session.c
4695 session_list_ptr
= session_get_list();
4697 /* Set up max poll set size */
4698 lttng_poll_set_max_size();
4700 /* Create thread to manage the client socket */
4701 ret
= pthread_create(&client_thread
, NULL
,
4702 thread_manage_clients
, (void *) NULL
);
4704 PERROR("pthread_create clients");
4708 /* Create thread to dispatch registration */
4709 ret
= pthread_create(&dispatch_thread
, NULL
,
4710 thread_dispatch_ust_registration
, (void *) NULL
);
4712 PERROR("pthread_create dispatch");
4716 /* Create thread to manage application registration. */
4717 ret
= pthread_create(®_apps_thread
, NULL
,
4718 thread_registration_apps
, (void *) NULL
);
4720 PERROR("pthread_create registration");
4724 /* Create thread to manage application socket */
4725 ret
= pthread_create(&apps_thread
, NULL
,
4726 thread_manage_apps
, (void *) NULL
);
4728 PERROR("pthread_create apps");
4732 /* Create kernel thread to manage kernel event */
4733 ret
= pthread_create(&kernel_thread
, NULL
,
4734 thread_manage_kernel
, (void *) NULL
);
4736 PERROR("pthread_create kernel");
4740 tracepoint(sessiond_boot_end
);
4742 ret
= pthread_join(kernel_thread
, &status
);
4744 PERROR("pthread_join");
4745 goto error
; /* join error, exit without cleanup */
4749 ret
= pthread_join(apps_thread
, &status
);
4751 PERROR("pthread_join");
4752 goto error
; /* join error, exit without cleanup */
4756 ret
= pthread_join(reg_apps_thread
, &status
);
4758 PERROR("pthread_join");
4759 goto error
; /* join error, exit without cleanup */
4763 ret
= pthread_join(dispatch_thread
, &status
);
4765 PERROR("pthread_join");
4766 goto error
; /* join error, exit without cleanup */
4770 ret
= pthread_join(client_thread
, &status
);
4772 PERROR("pthread_join");
4773 goto error
; /* join error, exit without cleanup */
4776 ret
= join_consumer_thread(&kconsumer_data
);
4778 PERROR("join_consumer");
4779 goto error
; /* join error, exit without cleanup */
4785 * cleanup() is called when no other thread is running.
4787 rcu_thread_online();
4789 rcu_thread_offline();
4790 rcu_unregister_thread();