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>
37 #include <urcu/uatomic.h>
41 #include <common/common.h>
42 #include <common/compat/poll.h>
43 #include <common/compat/socket.h>
44 #include <common/defaults.h>
45 #include <common/kernel-consumer/kernel-consumer.h>
46 #include <common/ust-consumer/ust-consumer.h>
48 #include "lttng-sessiond.h"
60 #define CONSUMERD_FILE "lttng-consumerd"
62 struct consumer_data
{
63 enum lttng_consumer_type type
;
65 pthread_t thread
; /* Worker thread interacting with the consumer */
68 /* Mutex to control consumerd pid assignation */
69 pthread_mutex_t pid_mutex
;
75 /* consumer error and command Unix socket path */
76 char err_unix_sock_path
[PATH_MAX
];
77 char cmd_unix_sock_path
[PATH_MAX
];
81 const char default_home_dir
[] = DEFAULT_HOME_DIR
;
82 const char default_tracing_group
[] = DEFAULT_TRACING_GROUP
;
83 const char default_ust_sock_dir
[] = DEFAULT_UST_SOCK_DIR
;
84 const char default_global_apps_pipe
[] = DEFAULT_GLOBAL_APPS_PIPE
;
87 const char *opt_tracing_group
;
88 static int opt_sig_parent
;
89 static int opt_verbose_consumer
;
90 static int opt_daemon
;
91 static int opt_no_kernel
;
92 static int is_root
; /* Set to 1 if the daemon is running as root */
93 static pid_t ppid
; /* Parent PID for --sig-parent option */
96 /* Consumer daemon specific control data */
97 static struct consumer_data kconsumer_data
= {
98 .type
= LTTNG_CONSUMER_KERNEL
,
99 .err_unix_sock_path
= DEFAULT_KCONSUMERD_ERR_SOCK_PATH
,
100 .cmd_unix_sock_path
= DEFAULT_KCONSUMERD_CMD_SOCK_PATH
,
104 static struct consumer_data ustconsumer64_data
= {
105 .type
= LTTNG_CONSUMER64_UST
,
106 .err_unix_sock_path
= DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
,
107 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
,
111 static struct consumer_data ustconsumer32_data
= {
112 .type
= LTTNG_CONSUMER32_UST
,
113 .err_unix_sock_path
= DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
,
114 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
,
119 static int dispatch_thread_exit
;
121 /* Global application Unix socket path */
122 static char apps_unix_sock_path
[PATH_MAX
];
123 /* Global client Unix socket path */
124 static char client_unix_sock_path
[PATH_MAX
];
125 /* global wait shm path for UST */
126 static char wait_shm_path
[PATH_MAX
];
128 /* Sockets and FDs */
129 static int client_sock
= -1;
130 static int apps_sock
= -1;
131 static int kernel_tracer_fd
= -1;
132 static int kernel_poll_pipe
[2] = { -1, -1 };
135 * Quit pipe for all threads. This permits a single cancellation point
136 * for all threads when receiving an event on the pipe.
138 static int thread_quit_pipe
[2] = { -1, -1 };
141 * This pipe is used to inform the thread managing application communication
142 * that a command is queued and ready to be processed.
144 static int apps_cmd_pipe
[2] = { -1, -1 };
146 /* Pthread, Mutexes and Semaphores */
147 static pthread_t apps_thread
;
148 static pthread_t reg_apps_thread
;
149 static pthread_t client_thread
;
150 static pthread_t kernel_thread
;
151 static pthread_t dispatch_thread
;
155 * UST registration command queue. This queue is tied with a futex and uses a N
156 * wakers / 1 waiter implemented and detailed in futex.c/.h
158 * The thread_manage_apps and thread_dispatch_ust_registration interact with
159 * this queue and the wait/wake scheme.
161 static struct ust_cmd_queue ust_cmd_queue
;
164 * Pointer initialized before thread creation.
166 * This points to the tracing session list containing the session count and a
167 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
168 * MUST NOT be taken if you call a public function in session.c.
170 * The lock is nested inside the structure: session_list_ptr->lock. Please use
171 * session_lock_list and session_unlock_list for lock acquisition.
173 static struct ltt_session_list
*session_list_ptr
;
175 int ust_consumerd64_fd
= -1;
176 int ust_consumerd32_fd
= -1;
178 static const char *consumerd32_bin
= CONFIG_CONSUMERD32_BIN
;
179 static const char *consumerd64_bin
= CONFIG_CONSUMERD64_BIN
;
180 static const char *consumerd32_libdir
= CONFIG_CONSUMERD32_LIBDIR
;
181 static const char *consumerd64_libdir
= CONFIG_CONSUMERD64_LIBDIR
;
184 * Consumer daemon state which is changed when spawning it, killing it or in
185 * case of a fatal error.
187 enum consumerd_state
{
188 CONSUMER_STARTED
= 1,
189 CONSUMER_STOPPED
= 2,
194 * This consumer daemon state is used to validate if a client command will be
195 * able to reach the consumer. If not, the client is informed. For instance,
196 * doing a "lttng start" when the consumer state is set to ERROR will return an
197 * error to the client.
199 * The following example shows a possible race condition of this scheme:
201 * consumer thread error happens
203 * client cmd checks state -> still OK
204 * consumer thread exit, sets error
205 * client cmd try to talk to consumer
208 * However, since the consumer is a different daemon, we have no way of making
209 * sure the command will reach it safely even with this state flag. This is why
210 * we consider that up to the state validation during command processing, the
211 * command is safe. After that, we can not guarantee the correctness of the
212 * client request vis-a-vis the consumer.
214 static enum consumerd_state ust_consumerd_state
;
215 static enum consumerd_state kernel_consumerd_state
;
218 void setup_consumerd_path(void)
220 const char *bin
, *libdir
;
223 * Allow INSTALL_BIN_PATH to be used as a target path for the
224 * native architecture size consumer if CONFIG_CONSUMER*_PATH
225 * has not been defined.
227 #if (CAA_BITS_PER_LONG == 32)
228 if (!consumerd32_bin
[0]) {
229 consumerd32_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
231 if (!consumerd32_libdir
[0]) {
232 consumerd32_libdir
= INSTALL_LIB_PATH
;
234 #elif (CAA_BITS_PER_LONG == 64)
235 if (!consumerd64_bin
[0]) {
236 consumerd64_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
238 if (!consumerd64_libdir
[0]) {
239 consumerd64_libdir
= INSTALL_LIB_PATH
;
242 #error "Unknown bitness"
246 * runtime env. var. overrides the build default.
248 bin
= getenv("LTTNG_CONSUMERD32_BIN");
250 consumerd32_bin
= bin
;
252 bin
= getenv("LTTNG_CONSUMERD64_BIN");
254 consumerd64_bin
= bin
;
256 libdir
= getenv("LTTNG_CONSUMERD32_LIBDIR");
258 consumerd32_libdir
= libdir
;
260 libdir
= getenv("LTTNG_CONSUMERD64_LIBDIR");
262 consumerd64_libdir
= libdir
;
267 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
269 static int create_thread_poll_set(struct lttng_poll_event
*events
,
274 if (events
== NULL
|| size
== 0) {
279 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
285 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
297 * Check if the thread quit pipe was triggered.
299 * Return 1 if it was triggered else 0;
301 static int check_thread_quit_pipe(int fd
, uint32_t events
)
303 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
311 * Return group ID of the tracing group or -1 if not found.
313 static gid_t
allowed_group(void)
317 if (opt_tracing_group
) {
318 grp
= getgrnam(opt_tracing_group
);
320 grp
= getgrnam(default_tracing_group
);
330 * Init thread quit pipe.
332 * Return -1 on error or 0 if all pipes are created.
334 static int init_thread_quit_pipe(void)
338 ret
= pipe(thread_quit_pipe
);
340 PERROR("thread quit pipe");
344 for (i
= 0; i
< 2; i
++) {
345 ret
= fcntl(thread_quit_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
357 * Complete teardown of a kernel session. This free all data structure related
358 * to a kernel session and update counter.
360 static void teardown_kernel_session(struct ltt_session
*session
)
362 if (!session
->kernel_session
) {
363 DBG3("No kernel session when tearing down session");
367 DBG("Tearing down kernel session");
370 * If a custom kernel consumer was registered, close the socket before
371 * tearing down the complete kernel session structure
373 if (kconsumer_data
.cmd_sock
>= 0 &&
374 session
->kernel_session
->consumer_fd
!= kconsumer_data
.cmd_sock
) {
375 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
378 trace_kernel_destroy_session(session
->kernel_session
);
382 * Complete teardown of all UST sessions. This will free everything on his path
383 * and destroy the core essence of all ust sessions :)
385 static void teardown_ust_session(struct ltt_session
*session
)
389 if (!session
->ust_session
) {
390 DBG3("No UST session when tearing down session");
394 DBG("Tearing down UST session(s)");
396 ret
= ust_app_destroy_trace_all(session
->ust_session
);
398 ERR("Error in ust_app_destroy_trace_all");
401 trace_ust_destroy_session(session
->ust_session
);
405 * Stop all threads by closing the thread quit pipe.
407 static void stop_threads(void)
411 /* Stopping all threads */
412 DBG("Terminating all threads");
413 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
415 ERR("write error on thread quit pipe");
418 /* Dispatch thread */
419 dispatch_thread_exit
= 1;
420 futex_nto1_wake(&ust_cmd_queue
.futex
);
426 static void cleanup(void)
430 struct ltt_session
*sess
, *stmp
;
434 DBG("Removing %s directory", rundir
);
435 ret
= asprintf(&cmd
, "rm -rf %s", rundir
);
437 ERR("asprintf failed. Something is really wrong!");
440 /* Remove lttng run directory */
443 ERR("Unable to clean %s", rundir
);
447 DBG("Cleaning up all sessions");
449 /* Destroy session list mutex */
450 if (session_list_ptr
!= NULL
) {
451 pthread_mutex_destroy(&session_list_ptr
->lock
);
453 /* Cleanup ALL session */
454 cds_list_for_each_entry_safe(sess
, stmp
,
455 &session_list_ptr
->head
, list
) {
456 teardown_kernel_session(sess
);
457 teardown_ust_session(sess
);
462 DBG("Closing all UST sockets");
463 ust_app_clean_list();
465 pthread_mutex_destroy(&kconsumer_data
.pid_mutex
);
467 if (is_root
&& !opt_no_kernel
) {
468 DBG2("Closing kernel fd");
469 if (kernel_tracer_fd
>= 0) {
470 ret
= close(kernel_tracer_fd
);
475 DBG("Unloading kernel modules");
476 modprobe_remove_lttng_all();
480 * Closing all pipes used for communication between threads.
482 for (i
= 0; i
< 2; i
++) {
483 if (kernel_poll_pipe
[i
] >= 0) {
484 ret
= close(kernel_poll_pipe
[i
]);
490 for (i
= 0; i
< 2; i
++) {
491 if (thread_quit_pipe
[i
] >= 0) {
492 ret
= close(thread_quit_pipe
[i
]);
498 for (i
= 0; i
< 2; i
++) {
499 if (apps_cmd_pipe
[i
] >= 0) {
500 ret
= close(apps_cmd_pipe
[i
]);
508 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
509 "Matthew, BEET driven development works!%c[%dm",
510 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
515 * Send data on a unix socket using the liblttsessiondcomm API.
517 * Return lttcomm error code.
519 static int send_unix_sock(int sock
, void *buf
, size_t len
)
521 /* Check valid length */
526 return lttcomm_send_unix_sock(sock
, buf
, len
);
530 * Free memory of a command context structure.
532 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
534 DBG("Clean command context structure");
536 if ((*cmd_ctx
)->llm
) {
537 free((*cmd_ctx
)->llm
);
539 if ((*cmd_ctx
)->lsm
) {
540 free((*cmd_ctx
)->lsm
);
548 * Send all stream fds of kernel channel to the consumer.
550 static int send_kconsumer_channel_streams(struct consumer_data
*consumer_data
,
551 int sock
, struct ltt_kernel_channel
*channel
,
552 uid_t uid
, gid_t gid
)
555 struct ltt_kernel_stream
*stream
;
556 struct lttcomm_consumer_msg lkm
;
558 DBG("Sending streams of channel %s to kernel consumer",
559 channel
->channel
->name
);
562 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
563 lkm
.u
.channel
.channel_key
= channel
->fd
;
564 lkm
.u
.channel
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
565 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
566 DBG("Sending channel %d to consumer", lkm
.u
.channel
.channel_key
);
567 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
569 PERROR("send consumer channel");
574 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
578 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
579 lkm
.u
.stream
.channel_key
= channel
->fd
;
580 lkm
.u
.stream
.stream_key
= stream
->fd
;
581 lkm
.u
.stream
.state
= stream
->state
;
582 lkm
.u
.stream
.output
= channel
->channel
->attr
.output
;
583 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
584 lkm
.u
.stream
.uid
= uid
;
585 lkm
.u
.stream
.gid
= gid
;
586 strncpy(lkm
.u
.stream
.path_name
, stream
->pathname
, PATH_MAX
- 1);
587 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
588 DBG("Sending stream %d to consumer", lkm
.u
.stream
.stream_key
);
589 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
591 PERROR("send consumer stream");
594 ret
= lttcomm_send_fds_unix_sock(sock
, &stream
->fd
, 1);
596 PERROR("send consumer stream ancillary data");
601 DBG("consumer channel streams sent");
610 * Send all stream fds of the kernel session to the consumer.
612 static int send_kconsumer_session_streams(struct consumer_data
*consumer_data
,
613 struct ltt_kernel_session
*session
)
616 struct ltt_kernel_channel
*chan
;
617 struct lttcomm_consumer_msg lkm
;
618 int sock
= session
->consumer_fd
;
620 DBG("Sending metadata stream fd");
622 /* Extra protection. It's NOT supposed to be set to -1 at this point */
623 if (session
->consumer_fd
< 0) {
624 session
->consumer_fd
= consumer_data
->cmd_sock
;
627 if (session
->metadata_stream_fd
>= 0) {
628 /* Send metadata channel fd */
629 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
630 lkm
.u
.channel
.channel_key
= session
->metadata
->fd
;
631 lkm
.u
.channel
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
632 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
633 DBG("Sending metadata channel %d to consumer", lkm
.u
.channel
.channel_key
);
634 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
636 PERROR("send consumer channel");
640 /* Send metadata stream fd */
641 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
642 lkm
.u
.stream
.channel_key
= session
->metadata
->fd
;
643 lkm
.u
.stream
.stream_key
= session
->metadata_stream_fd
;
644 lkm
.u
.stream
.state
= LTTNG_CONSUMER_ACTIVE_STREAM
;
645 lkm
.u
.stream
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
646 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
647 lkm
.u
.stream
.uid
= session
->uid
;
648 lkm
.u
.stream
.gid
= session
->gid
;
649 strncpy(lkm
.u
.stream
.path_name
, session
->metadata
->pathname
, PATH_MAX
- 1);
650 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
651 DBG("Sending metadata stream %d to consumer", lkm
.u
.stream
.stream_key
);
652 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
654 PERROR("send consumer stream");
657 ret
= lttcomm_send_fds_unix_sock(sock
, &session
->metadata_stream_fd
, 1);
659 PERROR("send consumer stream");
664 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
665 ret
= send_kconsumer_channel_streams(consumer_data
, sock
, chan
,
666 session
->uid
, session
->gid
);
672 DBG("consumer fds (metadata and channel streams) sent");
681 * Notify UST applications using the shm mmap futex.
683 static int notify_ust_apps(int active
)
687 DBG("Notifying applications of session daemon state: %d", active
);
689 /* See shm.c for this call implying mmap, shm and futex calls */
690 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
691 if (wait_shm_mmap
== NULL
) {
695 /* Wake waiting process */
696 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
698 /* Apps notified successfully */
706 * Setup the outgoing data buffer for the response (llm) by allocating the
707 * right amount of memory and copying the original information from the lsm
710 * Return total size of the buffer pointed by buf.
712 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
718 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
719 if (cmd_ctx
->llm
== NULL
) {
725 /* Copy common data */
726 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
727 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
729 cmd_ctx
->llm
->data_size
= size
;
730 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
739 * Update the kernel poll set of all channel fd available over all tracing
740 * session. Add the wakeup pipe at the end of the set.
742 static int update_kernel_poll(struct lttng_poll_event
*events
)
745 struct ltt_session
*session
;
746 struct ltt_kernel_channel
*channel
;
748 DBG("Updating kernel poll set");
751 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
752 session_lock(session
);
753 if (session
->kernel_session
== NULL
) {
754 session_unlock(session
);
758 cds_list_for_each_entry(channel
,
759 &session
->kernel_session
->channel_list
.head
, list
) {
760 /* Add channel fd to the kernel poll set */
761 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
763 session_unlock(session
);
766 DBG("Channel fd %d added to kernel set", channel
->fd
);
768 session_unlock(session
);
770 session_unlock_list();
775 session_unlock_list();
780 * Find the channel fd from 'fd' over all tracing session. When found, check
781 * for new channel stream and send those stream fds to the kernel consumer.
783 * Useful for CPU hotplug feature.
785 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
788 struct ltt_session
*session
;
789 struct ltt_kernel_channel
*channel
;
791 DBG("Updating kernel streams for channel fd %d", fd
);
794 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
795 session_lock(session
);
796 if (session
->kernel_session
== NULL
) {
797 session_unlock(session
);
801 /* This is not suppose to be -1 but this is an extra security check */
802 if (session
->kernel_session
->consumer_fd
< 0) {
803 session
->kernel_session
->consumer_fd
= consumer_data
->cmd_sock
;
806 cds_list_for_each_entry(channel
,
807 &session
->kernel_session
->channel_list
.head
, list
) {
808 if (channel
->fd
== fd
) {
809 DBG("Channel found, updating kernel streams");
810 ret
= kernel_open_channel_stream(channel
);
816 * Have we already sent fds to the consumer? If yes, it means
817 * that tracing is started so it is safe to send our updated
820 if (session
->kernel_session
->consumer_fds_sent
== 1) {
821 ret
= send_kconsumer_channel_streams(consumer_data
,
822 session
->kernel_session
->consumer_fd
, channel
,
823 session
->uid
, session
->gid
);
831 session_unlock(session
);
833 session_unlock_list();
837 session_unlock(session
);
838 session_unlock_list();
843 * For each tracing session, update newly registered apps.
845 static void update_ust_app(int app_sock
)
847 struct ltt_session
*sess
, *stmp
;
851 /* For all tracing session(s) */
852 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
854 if (sess
->ust_session
) {
855 ust_app_global_update(sess
->ust_session
, app_sock
);
857 session_unlock(sess
);
860 session_unlock_list();
864 * This thread manage event coming from the kernel.
866 * Features supported in this thread:
869 static void *thread_manage_kernel(void *data
)
871 int ret
, i
, pollfd
, update_poll_flag
= 1;
872 uint32_t revents
, nb_fd
;
874 struct lttng_poll_event events
;
876 DBG("Thread manage kernel started");
878 ret
= create_thread_poll_set(&events
, 2);
880 goto error_poll_create
;
883 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
889 if (update_poll_flag
== 1) {
891 * Reset number of fd in the poll set. Always 2 since there is the thread
892 * quit pipe and the kernel pipe.
896 ret
= update_kernel_poll(&events
);
900 update_poll_flag
= 0;
903 nb_fd
= LTTNG_POLL_GETNB(&events
);
905 DBG("Thread kernel polling on %d fds", nb_fd
);
907 /* Zeroed the poll events */
908 lttng_poll_reset(&events
);
910 /* Poll infinite value of time */
912 ret
= lttng_poll_wait(&events
, -1);
915 * Restart interrupted system call.
917 if (errno
== EINTR
) {
921 } else if (ret
== 0) {
922 /* Should not happen since timeout is infinite */
923 ERR("Return value of poll is 0 with an infinite timeout.\n"
924 "This should not have happened! Continuing...");
928 for (i
= 0; i
< nb_fd
; i
++) {
929 /* Fetch once the poll data */
930 revents
= LTTNG_POLL_GETEV(&events
, i
);
931 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
933 /* Thread quit pipe has been closed. Killing thread. */
934 ret
= check_thread_quit_pipe(pollfd
, revents
);
939 /* Check for data on kernel pipe */
940 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
941 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
942 update_poll_flag
= 1;
946 * New CPU detected by the kernel. Adding kernel stream to
947 * kernel session and updating the kernel consumer
949 if (revents
& LPOLLIN
) {
950 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
956 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
957 * and unregister kernel stream at this point.
965 lttng_poll_clean(&events
);
967 DBG("Kernel thread dying");
972 * This thread manage the consumer error sent back to the session daemon.
974 static void *thread_manage_consumer(void *data
)
976 int sock
= -1, i
, ret
, pollfd
;
977 uint32_t revents
, nb_fd
;
978 enum lttcomm_return_code code
;
979 struct lttng_poll_event events
;
980 struct consumer_data
*consumer_data
= data
;
982 DBG("[thread] Manage consumer started");
984 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
990 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
991 * Nothing more will be added to this poll set.
993 ret
= create_thread_poll_set(&events
, 2);
998 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
1003 nb_fd
= LTTNG_POLL_GETNB(&events
);
1005 /* Inifinite blocking call, waiting for transmission */
1007 ret
= lttng_poll_wait(&events
, -1);
1010 * Restart interrupted system call.
1012 if (errno
== EINTR
) {
1018 for (i
= 0; i
< nb_fd
; i
++) {
1019 /* Fetch once the poll data */
1020 revents
= LTTNG_POLL_GETEV(&events
, i
);
1021 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1023 /* Thread quit pipe has been closed. Killing thread. */
1024 ret
= check_thread_quit_pipe(pollfd
, revents
);
1029 /* Event on the registration socket */
1030 if (pollfd
== consumer_data
->err_sock
) {
1031 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1032 ERR("consumer err socket poll error");
1038 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
1043 DBG2("Receiving code from consumer err_sock");
1045 /* Getting status code from kconsumerd */
1046 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1047 sizeof(enum lttcomm_return_code
));
1052 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
1053 consumer_data
->cmd_sock
=
1054 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1055 if (consumer_data
->cmd_sock
< 0) {
1056 sem_post(&consumer_data
->sem
);
1057 PERROR("consumer connect");
1060 /* Signal condition to tell that the kconsumerd is ready */
1061 sem_post(&consumer_data
->sem
);
1062 DBG("consumer command socket ready");
1064 ERR("consumer error when waiting for SOCK_READY : %s",
1065 lttcomm_get_readable_code(-code
));
1069 /* Remove the kconsumerd error sock since we've established a connexion */
1070 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1075 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1080 /* Update number of fd */
1081 nb_fd
= LTTNG_POLL_GETNB(&events
);
1083 /* Inifinite blocking call, waiting for transmission */
1085 ret
= lttng_poll_wait(&events
, -1);
1088 * Restart interrupted system call.
1090 if (errno
== EINTR
) {
1096 for (i
= 0; i
< nb_fd
; i
++) {
1097 /* Fetch once the poll data */
1098 revents
= LTTNG_POLL_GETEV(&events
, i
);
1099 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1101 /* Thread quit pipe has been closed. Killing thread. */
1102 ret
= check_thread_quit_pipe(pollfd
, revents
);
1107 /* Event on the kconsumerd socket */
1108 if (pollfd
== sock
) {
1109 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1110 ERR("consumer err socket second poll error");
1116 /* Wait for any kconsumerd error */
1117 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1118 sizeof(enum lttcomm_return_code
));
1120 ERR("consumer closed the command socket");
1124 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
1127 /* Immediately set the consumerd state to stopped */
1128 if (consumer_data
->type
== LTTNG_CONSUMER_KERNEL
) {
1129 uatomic_set(&kernel_consumerd_state
, CONSUMER_ERROR
);
1130 } else if (consumer_data
->type
== LTTNG_CONSUMER64_UST
||
1131 consumer_data
->type
== LTTNG_CONSUMER32_UST
) {
1132 uatomic_set(&ust_consumerd_state
, CONSUMER_ERROR
);
1134 /* Code flow error... */
1138 if (consumer_data
->err_sock
>= 0) {
1139 ret
= close(consumer_data
->err_sock
);
1144 if (consumer_data
->cmd_sock
>= 0) {
1145 ret
= close(consumer_data
->cmd_sock
);
1157 unlink(consumer_data
->err_unix_sock_path
);
1158 unlink(consumer_data
->cmd_unix_sock_path
);
1159 consumer_data
->pid
= 0;
1161 lttng_poll_clean(&events
);
1164 DBG("consumer thread cleanup completed");
1170 * This thread manage application communication.
1172 static void *thread_manage_apps(void *data
)
1175 uint32_t revents
, nb_fd
;
1176 struct ust_command ust_cmd
;
1177 struct lttng_poll_event events
;
1179 DBG("[thread] Manage application started");
1181 rcu_register_thread();
1182 rcu_thread_online();
1184 ret
= create_thread_poll_set(&events
, 2);
1186 goto error_poll_create
;
1189 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1195 /* Zeroed the events structure */
1196 lttng_poll_reset(&events
);
1198 nb_fd
= LTTNG_POLL_GETNB(&events
);
1200 DBG("Apps thread polling on %d fds", nb_fd
);
1202 /* Inifinite blocking call, waiting for transmission */
1204 ret
= lttng_poll_wait(&events
, -1);
1207 * Restart interrupted system call.
1209 if (errno
== EINTR
) {
1215 for (i
= 0; i
< nb_fd
; i
++) {
1216 /* Fetch once the poll data */
1217 revents
= LTTNG_POLL_GETEV(&events
, i
);
1218 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1220 /* Thread quit pipe has been closed. Killing thread. */
1221 ret
= check_thread_quit_pipe(pollfd
, revents
);
1226 /* Inspect the apps cmd pipe */
1227 if (pollfd
== apps_cmd_pipe
[0]) {
1228 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1229 ERR("Apps command pipe error");
1231 } else if (revents
& LPOLLIN
) {
1233 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1234 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1235 PERROR("read apps cmd pipe");
1239 /* Register applicaton to the session daemon */
1240 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1242 if (ret
== -ENOMEM
) {
1244 } else if (ret
< 0) {
1249 * Validate UST version compatibility.
1251 ret
= ust_app_validate_version(ust_cmd
.sock
);
1254 * Add channel(s) and event(s) to newly registered apps
1255 * from lttng global UST domain.
1257 update_ust_app(ust_cmd
.sock
);
1260 ret
= ust_app_register_done(ust_cmd
.sock
);
1263 * If the registration is not possible, we simply
1264 * unregister the apps and continue
1266 ust_app_unregister(ust_cmd
.sock
);
1269 * We just need here to monitor the close of the UST
1270 * socket and poll set monitor those by default.
1271 * Listen on POLLIN (even if we never expect any
1272 * data) to ensure that hangup wakes us.
1274 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, LPOLLIN
);
1279 DBG("Apps with sock %d added to poll set",
1287 * At this point, we know that a registered application made
1288 * the event at poll_wait.
1290 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1291 /* Removing from the poll set */
1292 ret
= lttng_poll_del(&events
, pollfd
);
1297 /* Socket closed on remote end. */
1298 ust_app_unregister(pollfd
);
1306 lttng_poll_clean(&events
);
1308 DBG("Application communication apps thread cleanup complete");
1309 rcu_thread_offline();
1310 rcu_unregister_thread();
1315 * Dispatch request from the registration threads to the application
1316 * communication thread.
1318 static void *thread_dispatch_ust_registration(void *data
)
1321 struct cds_wfq_node
*node
;
1322 struct ust_command
*ust_cmd
= NULL
;
1324 DBG("[thread] Dispatch UST command started");
1326 while (!dispatch_thread_exit
) {
1327 /* Atomically prepare the queue futex */
1328 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1331 /* Dequeue command for registration */
1332 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1334 DBG("Woken up but nothing in the UST command queue");
1335 /* Continue thread execution */
1339 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1341 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1342 " gid:%d sock:%d name:%s (version %d.%d)",
1343 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1344 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1345 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1346 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1348 * Inform apps thread of the new application registration. This
1349 * call is blocking so we can be assured that the data will be read
1350 * at some point in time or wait to the end of the world :)
1352 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1353 sizeof(struct ust_command
));
1355 PERROR("write apps cmd pipe");
1356 if (errno
== EBADF
) {
1358 * We can't inform the application thread to process
1359 * registration. We will exit or else application
1360 * registration will not occur and tracing will never
1367 } while (node
!= NULL
);
1369 /* Futex wait on queue. Blocking call on futex() */
1370 futex_nto1_wait(&ust_cmd_queue
.futex
);
1374 DBG("Dispatch thread dying");
1379 * This thread manage application registration.
1381 static void *thread_registration_apps(void *data
)
1383 int sock
= -1, i
, ret
, pollfd
;
1384 uint32_t revents
, nb_fd
;
1385 struct lttng_poll_event events
;
1387 * Get allocated in this thread, enqueued to a global queue, dequeued and
1388 * freed in the manage apps thread.
1390 struct ust_command
*ust_cmd
= NULL
;
1392 DBG("[thread] Manage application registration started");
1394 ret
= lttcomm_listen_unix_sock(apps_sock
);
1400 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1401 * more will be added to this poll set.
1403 ret
= create_thread_poll_set(&events
, 2);
1405 goto error_create_poll
;
1408 /* Add the application registration socket */
1409 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1411 goto error_poll_add
;
1414 /* Notify all applications to register */
1415 ret
= notify_ust_apps(1);
1417 ERR("Failed to notify applications or create the wait shared memory.\n"
1418 "Execution continues but there might be problem for already\n"
1419 "running applications that wishes to register.");
1423 DBG("Accepting application registration");
1425 nb_fd
= LTTNG_POLL_GETNB(&events
);
1427 /* Inifinite blocking call, waiting for transmission */
1429 ret
= lttng_poll_wait(&events
, -1);
1432 * Restart interrupted system call.
1434 if (errno
== EINTR
) {
1440 for (i
= 0; i
< nb_fd
; i
++) {
1441 /* Fetch once the poll data */
1442 revents
= LTTNG_POLL_GETEV(&events
, i
);
1443 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1445 /* Thread quit pipe has been closed. Killing thread. */
1446 ret
= check_thread_quit_pipe(pollfd
, revents
);
1451 /* Event on the registration socket */
1452 if (pollfd
== apps_sock
) {
1453 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1454 ERR("Register apps socket poll error");
1456 } else if (revents
& LPOLLIN
) {
1457 sock
= lttcomm_accept_unix_sock(apps_sock
);
1462 /* Create UST registration command for enqueuing */
1463 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1464 if (ust_cmd
== NULL
) {
1465 PERROR("ust command zmalloc");
1470 * Using message-based transmissions to ensure we don't
1471 * have to deal with partially received messages.
1473 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
1475 ERR("Exhausted file descriptors allowed for applications.");
1484 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1485 sizeof(struct ust_register_msg
));
1486 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1488 PERROR("lttcomm_recv_unix_sock register apps");
1490 ERR("Wrong size received on apps register");
1497 lttng_fd_put(LTTNG_FD_APPS
, 1);
1502 ust_cmd
->sock
= sock
;
1505 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1506 " gid:%d sock:%d name:%s (version %d.%d)",
1507 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1508 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1509 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1510 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1513 * Lock free enqueue the registration request. The red pill
1514 * has been taken! This apps will be part of the *system*.
1516 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1519 * Wake the registration queue futex. Implicit memory
1520 * barrier with the exchange in cds_wfq_enqueue.
1522 futex_nto1_wake(&ust_cmd_queue
.futex
);
1529 /* Notify that the registration thread is gone */
1532 if (apps_sock
>= 0) {
1533 ret
= close(apps_sock
);
1543 lttng_fd_put(LTTNG_FD_APPS
, 1);
1545 unlink(apps_unix_sock_path
);
1548 lttng_poll_clean(&events
);
1551 DBG("UST Registration thread cleanup complete");
1557 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1558 * exec or it will fails.
1560 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1563 struct timespec timeout
;
1565 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1566 timeout
.tv_nsec
= 0;
1568 /* Setup semaphore */
1569 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1571 PERROR("sem_init consumer semaphore");
1575 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1576 thread_manage_consumer
, consumer_data
);
1578 PERROR("pthread_create consumer");
1583 /* Get time for sem_timedwait absolute timeout */
1584 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1586 PERROR("clock_gettime spawn consumer");
1587 /* Infinite wait for the kconsumerd thread to be ready */
1588 ret
= sem_wait(&consumer_data
->sem
);
1590 /* Normal timeout if the gettime was successful */
1591 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1592 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1596 if (errno
== ETIMEDOUT
) {
1598 * Call has timed out so we kill the kconsumerd_thread and return
1601 ERR("The consumer thread was never ready. Killing it");
1602 ret
= pthread_cancel(consumer_data
->thread
);
1604 PERROR("pthread_cancel consumer thread");
1607 PERROR("semaphore wait failed consumer thread");
1612 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1613 if (consumer_data
->pid
== 0) {
1614 ERR("Kconsumerd did not start");
1615 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1618 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1627 * Join consumer thread
1629 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1634 if (consumer_data
->pid
!= 0) {
1635 ret
= kill(consumer_data
->pid
, SIGTERM
);
1637 ERR("Error killing consumer daemon");
1640 return pthread_join(consumer_data
->thread
, &status
);
1647 * Fork and exec a consumer daemon (consumerd).
1649 * Return pid if successful else -1.
1651 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1655 const char *consumer_to_use
;
1656 const char *verbosity
;
1659 DBG("Spawning consumerd");
1666 if (opt_verbose_consumer
) {
1667 verbosity
= "--verbose";
1669 verbosity
= "--quiet";
1671 switch (consumer_data
->type
) {
1672 case LTTNG_CONSUMER_KERNEL
:
1674 * Find out which consumerd to execute. We will first try the
1675 * 64-bit path, then the sessiond's installation directory, and
1676 * fallback on the 32-bit one,
1678 DBG3("Looking for a kernel consumer at these locations:");
1679 DBG3(" 1) %s", consumerd64_bin
);
1680 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, CONSUMERD_FILE
);
1681 DBG3(" 3) %s", consumerd32_bin
);
1682 if (stat(consumerd64_bin
, &st
) == 0) {
1683 DBG3("Found location #1");
1684 consumer_to_use
= consumerd64_bin
;
1685 } else if (stat(INSTALL_BIN_PATH
"/" CONSUMERD_FILE
, &st
) == 0) {
1686 DBG3("Found location #2");
1687 consumer_to_use
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
1688 } else if (stat(consumerd32_bin
, &st
) == 0) {
1689 DBG3("Found location #3");
1690 consumer_to_use
= consumerd32_bin
;
1692 DBG("Could not find any valid consumerd executable");
1695 DBG("Using kernel consumer at: %s", consumer_to_use
);
1696 execl(consumer_to_use
,
1697 "lttng-consumerd", verbosity
, "-k",
1698 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1699 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1702 case LTTNG_CONSUMER64_UST
:
1704 char *tmpnew
= NULL
;
1706 if (consumerd64_libdir
[0] != '\0') {
1710 tmp
= getenv("LD_LIBRARY_PATH");
1714 tmplen
= strlen("LD_LIBRARY_PATH=")
1715 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
1716 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1721 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1722 strcat(tmpnew
, consumerd64_libdir
);
1723 if (tmp
[0] != '\0') {
1724 strcat(tmpnew
, ":");
1725 strcat(tmpnew
, tmp
);
1727 ret
= putenv(tmpnew
);
1733 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin
);
1734 ret
= execl(consumerd64_bin
, "lttng-consumerd", verbosity
, "-u",
1735 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1736 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1738 if (consumerd64_libdir
[0] != '\0') {
1746 case LTTNG_CONSUMER32_UST
:
1748 char *tmpnew
= NULL
;
1750 if (consumerd32_libdir
[0] != '\0') {
1754 tmp
= getenv("LD_LIBRARY_PATH");
1758 tmplen
= strlen("LD_LIBRARY_PATH=")
1759 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
1760 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1765 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1766 strcat(tmpnew
, consumerd32_libdir
);
1767 if (tmp
[0] != '\0') {
1768 strcat(tmpnew
, ":");
1769 strcat(tmpnew
, tmp
);
1771 ret
= putenv(tmpnew
);
1777 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin
);
1778 ret
= execl(consumerd32_bin
, "lttng-consumerd", verbosity
, "-u",
1779 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1780 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1782 if (consumerd32_libdir
[0] != '\0') {
1791 PERROR("unknown consumer type");
1795 PERROR("kernel start consumer exec");
1798 } else if (pid
> 0) {
1801 PERROR("start consumer fork");
1809 * Spawn the consumerd daemon and session daemon thread.
1811 static int start_consumerd(struct consumer_data
*consumer_data
)
1815 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1816 if (consumer_data
->pid
!= 0) {
1817 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1821 ret
= spawn_consumerd(consumer_data
);
1823 ERR("Spawning consumerd failed");
1824 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1828 /* Setting up the consumer_data pid */
1829 consumer_data
->pid
= ret
;
1830 DBG2("Consumer pid %d", consumer_data
->pid
);
1831 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1833 DBG2("Spawning consumer control thread");
1834 ret
= spawn_consumer_thread(consumer_data
);
1836 ERR("Fatal error spawning consumer control thread");
1848 * Check version of the lttng-modules.
1850 static int validate_lttng_modules_version(void)
1852 return kernel_validate_version(kernel_tracer_fd
);
1856 * Setup necessary data for kernel tracer action.
1858 static int init_kernel_tracer(void)
1862 /* Modprobe lttng kernel modules */
1863 ret
= modprobe_lttng_control();
1868 /* Open debugfs lttng */
1869 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
1870 if (kernel_tracer_fd
< 0) {
1871 DBG("Failed to open %s", module_proc_lttng
);
1876 /* Validate kernel version */
1877 ret
= validate_lttng_modules_version();
1882 ret
= modprobe_lttng_data();
1887 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1891 modprobe_remove_lttng_control();
1892 ret
= close(kernel_tracer_fd
);
1896 kernel_tracer_fd
= -1;
1897 return LTTCOMM_KERN_VERSION
;
1900 ret
= close(kernel_tracer_fd
);
1906 modprobe_remove_lttng_control();
1909 WARN("No kernel tracer available");
1910 kernel_tracer_fd
= -1;
1912 return LTTCOMM_NEED_ROOT_SESSIOND
;
1914 return LTTCOMM_KERN_NA
;
1919 * Init tracing by creating trace directory and sending fds kernel consumer.
1921 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
1925 if (session
->consumer_fds_sent
== 0) {
1927 * Assign default kernel consumer socket if no consumer assigned to the
1928 * kernel session. At this point, it's NOT supposed to be -1 but this is
1929 * an extra security check.
1931 if (session
->consumer_fd
< 0) {
1932 session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1935 ret
= send_kconsumer_session_streams(&kconsumer_data
, session
);
1937 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1941 session
->consumer_fds_sent
= 1;
1949 * Create an UST session and add it to the session ust list.
1951 static int create_ust_session(struct ltt_session
*session
,
1952 struct lttng_domain
*domain
)
1954 struct ltt_ust_session
*lus
= NULL
;
1957 switch (domain
->type
) {
1958 case LTTNG_DOMAIN_UST
:
1961 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1965 DBG("Creating UST session");
1967 lus
= trace_ust_create_session(session
->path
, session
->id
, domain
);
1969 ret
= LTTCOMM_UST_SESS_FAIL
;
1973 ret
= run_as_mkdir_recursive(lus
->pathname
, S_IRWXU
| S_IRWXG
,
1974 session
->uid
, session
->gid
);
1976 if (ret
!= -EEXIST
) {
1977 ERR("Trace directory creation error");
1978 ret
= LTTCOMM_UST_SESS_FAIL
;
1983 /* The domain type dictate different actions on session creation */
1984 switch (domain
->type
) {
1985 case LTTNG_DOMAIN_UST
:
1986 /* No ustctl for the global UST domain */
1989 ERR("Unknown UST domain on create session %d", domain
->type
);
1992 lus
->uid
= session
->uid
;
1993 lus
->gid
= session
->gid
;
1994 session
->ust_session
= lus
;
2004 * Create a kernel tracer session then create the default channel.
2006 static int create_kernel_session(struct ltt_session
*session
)
2010 DBG("Creating kernel session");
2012 ret
= kernel_create_session(session
, kernel_tracer_fd
);
2014 ret
= LTTCOMM_KERN_SESS_FAIL
;
2018 /* Set kernel consumer socket fd */
2019 if (kconsumer_data
.cmd_sock
>= 0) {
2020 session
->kernel_session
->consumer_fd
= kconsumer_data
.cmd_sock
;
2023 ret
= run_as_mkdir_recursive(session
->kernel_session
->trace_path
,
2024 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2026 if (ret
!= -EEXIST
) {
2027 ERR("Trace directory creation error");
2031 session
->kernel_session
->uid
= session
->uid
;
2032 session
->kernel_session
->gid
= session
->gid
;
2039 * Check if the UID or GID match the session. Root user has access to all
2042 static int session_access_ok(struct ltt_session
*session
, uid_t uid
, gid_t gid
)
2044 if (uid
!= session
->uid
&& gid
!= session
->gid
&& uid
!= 0) {
2051 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2054 struct ltt_session
*session
;
2056 DBG("Counting number of available session for UID %d GID %d",
2058 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2060 * Only list the sessions the user can control.
2062 if (!session_access_ok(session
, uid
, gid
)) {
2071 * Using the session list, filled a lttng_session array to send back to the
2072 * client for session listing.
2074 * The session list lock MUST be acquired before calling this function. Use
2075 * session_lock_list() and session_unlock_list().
2077 static void list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2081 struct ltt_session
*session
;
2083 DBG("Getting all available session for UID %d GID %d",
2086 * Iterate over session list and append data after the control struct in
2089 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2091 * Only list the sessions the user can control.
2093 if (!session_access_ok(session
, uid
, gid
)) {
2096 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
2097 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
2098 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2099 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2100 sessions
[i
].enabled
= session
->enabled
;
2106 * Fill lttng_channel array of all channels.
2108 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
2109 struct lttng_channel
*channels
)
2112 struct ltt_kernel_channel
*kchan
;
2114 DBG("Listing channels for session %s", session
->name
);
2117 case LTTNG_DOMAIN_KERNEL
:
2118 /* Kernel channels */
2119 if (session
->kernel_session
!= NULL
) {
2120 cds_list_for_each_entry(kchan
,
2121 &session
->kernel_session
->channel_list
.head
, list
) {
2122 /* Copy lttng_channel struct to array */
2123 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
2124 channels
[i
].enabled
= kchan
->enabled
;
2129 case LTTNG_DOMAIN_UST
:
2131 struct lttng_ht_iter iter
;
2132 struct ltt_ust_channel
*uchan
;
2134 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
2135 &iter
.iter
, uchan
, node
.node
) {
2136 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
2137 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
2138 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
2139 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
2140 channels
[i
].attr
.switch_timer_interval
=
2141 uchan
->attr
.switch_timer_interval
;
2142 channels
[i
].attr
.read_timer_interval
=
2143 uchan
->attr
.read_timer_interval
;
2144 channels
[i
].enabled
= uchan
->enabled
;
2145 switch (uchan
->attr
.output
) {
2146 case LTTNG_UST_MMAP
:
2148 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
2161 * Create a list of ust global domain events.
2163 static int list_lttng_ust_global_events(char *channel_name
,
2164 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
2167 unsigned int nb_event
= 0;
2168 struct lttng_ht_iter iter
;
2169 struct lttng_ht_node_str
*node
;
2170 struct ltt_ust_channel
*uchan
;
2171 struct ltt_ust_event
*uevent
;
2172 struct lttng_event
*tmp
;
2174 DBG("Listing UST global events for channel %s", channel_name
);
2178 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
2179 node
= lttng_ht_iter_get_node_str(&iter
);
2181 ret
= -LTTCOMM_UST_CHAN_NOT_FOUND
;
2185 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
2187 nb_event
+= lttng_ht_get_count(uchan
->events
);
2189 if (nb_event
== 0) {
2194 DBG3("Listing UST global %d events", nb_event
);
2196 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2198 ret
= -LTTCOMM_FATAL
;
2202 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
2203 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
2204 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2205 tmp
[i
].enabled
= uevent
->enabled
;
2206 switch (uevent
->attr
.instrumentation
) {
2207 case LTTNG_UST_TRACEPOINT
:
2208 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2210 case LTTNG_UST_PROBE
:
2211 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
2213 case LTTNG_UST_FUNCTION
:
2214 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
2217 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
2218 switch (uevent
->attr
.loglevel_type
) {
2219 case LTTNG_UST_LOGLEVEL_ALL
:
2220 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
2222 case LTTNG_UST_LOGLEVEL_RANGE
:
2223 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
2225 case LTTNG_UST_LOGLEVEL_SINGLE
:
2226 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
2241 * Fill lttng_event array of all kernel events in the channel.
2243 static int list_lttng_kernel_events(char *channel_name
,
2244 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
2247 unsigned int nb_event
;
2248 struct ltt_kernel_event
*event
;
2249 struct ltt_kernel_channel
*kchan
;
2251 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
2252 if (kchan
== NULL
) {
2253 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2257 nb_event
= kchan
->event_count
;
2259 DBG("Listing events for channel %s", kchan
->channel
->name
);
2261 if (nb_event
== 0) {
2266 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2267 if (*events
== NULL
) {
2268 ret
= LTTCOMM_FATAL
;
2272 /* Kernel channels */
2273 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
2274 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
2275 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2276 (*events
)[i
].enabled
= event
->enabled
;
2277 switch (event
->event
->instrumentation
) {
2278 case LTTNG_KERNEL_TRACEPOINT
:
2279 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2281 case LTTNG_KERNEL_KPROBE
:
2282 case LTTNG_KERNEL_KRETPROBE
:
2283 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
2284 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
2285 sizeof(struct lttng_kernel_kprobe
));
2287 case LTTNG_KERNEL_FUNCTION
:
2288 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
2289 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
2290 sizeof(struct lttng_kernel_function
));
2292 case LTTNG_KERNEL_NOOP
:
2293 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
2295 case LTTNG_KERNEL_SYSCALL
:
2296 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
2298 case LTTNG_KERNEL_ALL
:
2312 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2314 static int cmd_disable_channel(struct ltt_session
*session
,
2315 int domain
, char *channel_name
)
2318 struct ltt_ust_session
*usess
;
2320 usess
= session
->ust_session
;
2323 case LTTNG_DOMAIN_KERNEL
:
2325 ret
= channel_kernel_disable(session
->kernel_session
,
2327 if (ret
!= LTTCOMM_OK
) {
2331 kernel_wait_quiescent(kernel_tracer_fd
);
2334 case LTTNG_DOMAIN_UST
:
2336 struct ltt_ust_channel
*uchan
;
2337 struct lttng_ht
*chan_ht
;
2339 chan_ht
= usess
->domain_global
.channels
;
2341 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
2342 if (uchan
== NULL
) {
2343 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2347 ret
= channel_ust_disable(usess
, domain
, uchan
);
2348 if (ret
!= LTTCOMM_OK
) {
2354 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2355 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2356 case LTTNG_DOMAIN_UST_PID
:
2359 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2370 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2372 static int cmd_enable_channel(struct ltt_session
*session
,
2373 int domain
, struct lttng_channel
*attr
)
2376 struct ltt_ust_session
*usess
= session
->ust_session
;
2377 struct lttng_ht
*chan_ht
;
2379 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
2382 case LTTNG_DOMAIN_KERNEL
:
2384 struct ltt_kernel_channel
*kchan
;
2386 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
2387 session
->kernel_session
);
2388 if (kchan
== NULL
) {
2389 ret
= channel_kernel_create(session
->kernel_session
,
2390 attr
, kernel_poll_pipe
[1]);
2392 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
2395 if (ret
!= LTTCOMM_OK
) {
2399 kernel_wait_quiescent(kernel_tracer_fd
);
2402 case LTTNG_DOMAIN_UST
:
2404 struct ltt_ust_channel
*uchan
;
2406 chan_ht
= usess
->domain_global
.channels
;
2408 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
2409 if (uchan
== NULL
) {
2410 ret
= channel_ust_create(usess
, domain
, attr
);
2412 ret
= channel_ust_enable(usess
, domain
, uchan
);
2417 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2418 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2419 case LTTNG_DOMAIN_UST_PID
:
2422 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2431 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2433 static int cmd_disable_event(struct ltt_session
*session
, int domain
,
2434 char *channel_name
, char *event_name
)
2439 case LTTNG_DOMAIN_KERNEL
:
2441 struct ltt_kernel_channel
*kchan
;
2442 struct ltt_kernel_session
*ksess
;
2444 ksess
= session
->kernel_session
;
2446 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2447 if (kchan
== NULL
) {
2448 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2452 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
2453 if (ret
!= LTTCOMM_OK
) {
2457 kernel_wait_quiescent(kernel_tracer_fd
);
2460 case LTTNG_DOMAIN_UST
:
2462 struct ltt_ust_channel
*uchan
;
2463 struct ltt_ust_session
*usess
;
2465 usess
= session
->ust_session
;
2467 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2469 if (uchan
== NULL
) {
2470 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2474 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
2475 if (ret
!= LTTCOMM_OK
) {
2479 DBG3("Disable UST event %s in channel %s completed", event_name
,
2484 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2485 case LTTNG_DOMAIN_UST_PID
:
2486 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2500 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2502 static int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
2508 case LTTNG_DOMAIN_KERNEL
:
2510 struct ltt_kernel_session
*ksess
;
2511 struct ltt_kernel_channel
*kchan
;
2513 ksess
= session
->kernel_session
;
2515 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2516 if (kchan
== NULL
) {
2517 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2521 ret
= event_kernel_disable_all(ksess
, kchan
);
2522 if (ret
!= LTTCOMM_OK
) {
2526 kernel_wait_quiescent(kernel_tracer_fd
);
2529 case LTTNG_DOMAIN_UST
:
2531 struct ltt_ust_session
*usess
;
2532 struct ltt_ust_channel
*uchan
;
2534 usess
= session
->ust_session
;
2536 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2538 if (uchan
== NULL
) {
2539 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2543 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
2548 DBG3("Disable all UST events in channel %s completed", channel_name
);
2553 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2554 case LTTNG_DOMAIN_UST_PID
:
2555 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2569 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2571 static int cmd_add_context(struct ltt_session
*session
, int domain
,
2572 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
2577 case LTTNG_DOMAIN_KERNEL
:
2578 /* Add kernel context to kernel tracer */
2579 ret
= context_kernel_add(session
->kernel_session
, ctx
,
2580 event_name
, channel_name
);
2581 if (ret
!= LTTCOMM_OK
) {
2585 case LTTNG_DOMAIN_UST
:
2587 struct ltt_ust_session
*usess
= session
->ust_session
;
2589 ret
= context_ust_add(usess
, domain
, ctx
, event_name
, channel_name
);
2590 if (ret
!= LTTCOMM_OK
) {
2596 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2597 case LTTNG_DOMAIN_UST_PID
:
2598 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2612 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2614 static int cmd_enable_event(struct ltt_session
*session
, int domain
,
2615 char *channel_name
, struct lttng_event
*event
)
2618 struct lttng_channel
*attr
;
2619 struct ltt_ust_session
*usess
= session
->ust_session
;
2622 case LTTNG_DOMAIN_KERNEL
:
2624 struct ltt_kernel_channel
*kchan
;
2626 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2627 session
->kernel_session
);
2628 if (kchan
== NULL
) {
2629 attr
= channel_new_default_attr(domain
);
2631 ret
= LTTCOMM_FATAL
;
2634 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2636 /* This call will notify the kernel thread */
2637 ret
= channel_kernel_create(session
->kernel_session
,
2638 attr
, kernel_poll_pipe
[1]);
2639 if (ret
!= LTTCOMM_OK
) {
2646 /* Get the newly created kernel channel pointer */
2647 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2648 session
->kernel_session
);
2649 if (kchan
== NULL
) {
2650 /* This sould not happen... */
2651 ret
= LTTCOMM_FATAL
;
2655 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
2657 if (ret
!= LTTCOMM_OK
) {
2661 kernel_wait_quiescent(kernel_tracer_fd
);
2664 case LTTNG_DOMAIN_UST
:
2666 struct lttng_channel
*attr
;
2667 struct ltt_ust_channel
*uchan
;
2669 /* Get channel from global UST domain */
2670 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2672 if (uchan
== NULL
) {
2673 /* Create default channel */
2674 attr
= channel_new_default_attr(domain
);
2676 ret
= LTTCOMM_FATAL
;
2679 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2680 attr
->name
[NAME_MAX
- 1] = '\0';
2682 ret
= channel_ust_create(usess
, domain
, attr
);
2683 if (ret
!= LTTCOMM_OK
) {
2689 /* Get the newly created channel reference back */
2690 uchan
= trace_ust_find_channel_by_name(
2691 usess
->domain_global
.channels
, channel_name
);
2692 if (uchan
== NULL
) {
2693 /* Something is really wrong */
2694 ret
= LTTCOMM_FATAL
;
2699 /* At this point, the session and channel exist on the tracer */
2700 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
);
2701 if (ret
!= LTTCOMM_OK
) {
2707 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2708 case LTTNG_DOMAIN_UST_PID
:
2709 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2723 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2725 static int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
2726 char *channel_name
, int event_type
)
2729 struct ltt_kernel_channel
*kchan
;
2732 case LTTNG_DOMAIN_KERNEL
:
2733 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2734 session
->kernel_session
);
2735 if (kchan
== NULL
) {
2736 /* This call will notify the kernel thread */
2737 ret
= channel_kernel_create(session
->kernel_session
, NULL
,
2738 kernel_poll_pipe
[1]);
2739 if (ret
!= LTTCOMM_OK
) {
2743 /* Get the newly created kernel channel pointer */
2744 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2745 session
->kernel_session
);
2746 if (kchan
== NULL
) {
2747 /* This sould not happen... */
2748 ret
= LTTCOMM_FATAL
;
2754 switch (event_type
) {
2755 case LTTNG_EVENT_SYSCALL
:
2756 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
2757 kchan
, kernel_tracer_fd
);
2759 case LTTNG_EVENT_TRACEPOINT
:
2761 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2762 * events already registered to the channel.
2764 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
2765 kchan
, kernel_tracer_fd
);
2767 case LTTNG_EVENT_ALL
:
2768 /* Enable syscalls and tracepoints */
2769 ret
= event_kernel_enable_all(session
->kernel_session
,
2770 kchan
, kernel_tracer_fd
);
2773 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2777 /* Manage return value */
2778 if (ret
!= LTTCOMM_OK
) {
2782 kernel_wait_quiescent(kernel_tracer_fd
);
2784 case LTTNG_DOMAIN_UST
:
2786 struct lttng_channel
*attr
;
2787 struct ltt_ust_channel
*uchan
;
2788 struct ltt_ust_session
*usess
= session
->ust_session
;
2790 /* Get channel from global UST domain */
2791 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2793 if (uchan
== NULL
) {
2794 /* Create default channel */
2795 attr
= channel_new_default_attr(domain
);
2797 ret
= LTTCOMM_FATAL
;
2800 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2801 attr
->name
[NAME_MAX
- 1] = '\0';
2803 /* Use the internal command enable channel */
2804 ret
= channel_ust_create(usess
, domain
, attr
);
2805 if (ret
!= LTTCOMM_OK
) {
2811 /* Get the newly created channel reference back */
2812 uchan
= trace_ust_find_channel_by_name(
2813 usess
->domain_global
.channels
, channel_name
);
2814 if (uchan
== NULL
) {
2815 /* Something is really wrong */
2816 ret
= LTTCOMM_FATAL
;
2821 /* At this point, the session and channel exist on the tracer */
2823 switch (event_type
) {
2824 case LTTNG_EVENT_ALL
:
2825 case LTTNG_EVENT_TRACEPOINT
:
2826 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
);
2827 if (ret
!= LTTCOMM_OK
) {
2832 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2836 /* Manage return value */
2837 if (ret
!= LTTCOMM_OK
) {
2844 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2845 case LTTNG_DOMAIN_UST_PID
:
2846 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2860 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2862 static ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
2865 ssize_t nb_events
= 0;
2868 case LTTNG_DOMAIN_KERNEL
:
2869 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2870 if (nb_events
< 0) {
2871 ret
= LTTCOMM_KERN_LIST_FAIL
;
2875 case LTTNG_DOMAIN_UST
:
2876 nb_events
= ust_app_list_events(events
);
2877 if (nb_events
< 0) {
2878 ret
= LTTCOMM_UST_LIST_FAIL
;
2890 /* Return negative value to differentiate return code */
2895 * Command LTTNG_START_TRACE processed by the client thread.
2897 static int cmd_start_trace(struct ltt_session
*session
)
2900 struct ltt_kernel_session
*ksession
;
2901 struct ltt_ust_session
*usess
;
2904 ksession
= session
->kernel_session
;
2905 usess
= session
->ust_session
;
2907 if (session
->enabled
) {
2908 /* Already started. */
2909 ret
= LTTCOMM_TRACE_ALREADY_STARTED
;
2913 session
->enabled
= 1;
2915 /* Kernel tracing */
2916 if (ksession
!= NULL
) {
2917 struct ltt_kernel_channel
*kchan
;
2919 /* Open kernel metadata */
2920 if (ksession
->metadata
== NULL
) {
2921 ret
= kernel_open_metadata(ksession
, ksession
->trace_path
);
2923 ret
= LTTCOMM_KERN_META_FAIL
;
2928 /* Open kernel metadata stream */
2929 if (ksession
->metadata_stream_fd
< 0) {
2930 ret
= kernel_open_metadata_stream(ksession
);
2932 ERR("Kernel create metadata stream failed");
2933 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2938 /* For each channel */
2939 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2940 if (kchan
->stream_count
== 0) {
2941 ret
= kernel_open_channel_stream(kchan
);
2943 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2946 /* Update the stream global counter */
2947 ksession
->stream_count_global
+= ret
;
2951 /* Setup kernel consumer socket and send fds to it */
2952 ret
= init_kernel_tracing(ksession
);
2954 ret
= LTTCOMM_KERN_START_FAIL
;
2958 /* This start the kernel tracing */
2959 ret
= kernel_start_session(ksession
);
2961 ret
= LTTCOMM_KERN_START_FAIL
;
2965 /* Quiescent wait after starting trace */
2966 kernel_wait_quiescent(kernel_tracer_fd
);
2969 /* Flag session that trace should start automatically */
2971 usess
->start_trace
= 1;
2973 ret
= ust_app_start_trace_all(usess
);
2975 ret
= LTTCOMM_UST_START_FAIL
;
2987 * Command LTTNG_STOP_TRACE processed by the client thread.
2989 static int cmd_stop_trace(struct ltt_session
*session
)
2992 struct ltt_kernel_channel
*kchan
;
2993 struct ltt_kernel_session
*ksession
;
2994 struct ltt_ust_session
*usess
;
2997 ksession
= session
->kernel_session
;
2998 usess
= session
->ust_session
;
3000 if (!session
->enabled
) {
3001 ret
= LTTCOMM_TRACE_ALREADY_STOPPED
;
3005 session
->enabled
= 0;
3008 if (ksession
!= NULL
) {
3009 DBG("Stop kernel tracing");
3011 /* Flush all buffers before stopping */
3012 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
3014 ERR("Kernel metadata flush failed");
3017 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
3018 ret
= kernel_flush_buffer(kchan
);
3020 ERR("Kernel flush buffer error");
3024 ret
= kernel_stop_session(ksession
);
3026 ret
= LTTCOMM_KERN_STOP_FAIL
;
3030 kernel_wait_quiescent(kernel_tracer_fd
);
3034 usess
->start_trace
= 0;
3036 ret
= ust_app_stop_trace_all(usess
);
3038 ret
= LTTCOMM_UST_STOP_FAIL
;
3050 * Command LTTNG_CREATE_SESSION processed by the client thread.
3052 static int cmd_create_session(char *name
, char *path
, lttng_sock_cred
*creds
)
3056 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
3057 LTTNG_SOCK_GET_GID_CRED(creds
));
3058 if (ret
!= LTTCOMM_OK
) {
3069 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3071 static int cmd_destroy_session(struct ltt_session
*session
, char *name
)
3075 /* Clean kernel session teardown */
3076 teardown_kernel_session(session
);
3077 /* UST session teardown */
3078 teardown_ust_session(session
);
3081 * Must notify the kernel thread here to update it's poll setin order
3082 * to remove the channel(s)' fd just destroyed.
3084 ret
= notify_thread_pipe(kernel_poll_pipe
[1]);
3086 PERROR("write kernel poll pipe");
3089 ret
= session_destroy(session
);
3095 * Command LTTNG_CALIBRATE processed by the client thread.
3097 static int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
3102 case LTTNG_DOMAIN_KERNEL
:
3104 struct lttng_kernel_calibrate kcalibrate
;
3106 kcalibrate
.type
= calibrate
->type
;
3107 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
3109 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
3114 case LTTNG_DOMAIN_UST
:
3116 struct lttng_ust_calibrate ucalibrate
;
3118 ucalibrate
.type
= calibrate
->type
;
3119 ret
= ust_app_calibrate_glb(&ucalibrate
);
3121 ret
= LTTCOMM_UST_CALIBRATE_FAIL
;
3138 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3140 static int cmd_register_consumer(struct ltt_session
*session
, int domain
,
3146 case LTTNG_DOMAIN_KERNEL
:
3147 /* Can't register a consumer if there is already one */
3148 if (session
->kernel_session
->consumer_fds_sent
!= 0) {
3149 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3153 sock
= lttcomm_connect_unix_sock(sock_path
);
3155 ret
= LTTCOMM_CONNECT_FAIL
;
3159 session
->kernel_session
->consumer_fd
= sock
;
3162 /* TODO: Userspace tracing */
3174 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3176 static ssize_t
cmd_list_domains(struct ltt_session
*session
,
3177 struct lttng_domain
**domains
)
3182 if (session
->kernel_session
!= NULL
) {
3183 DBG3("Listing domains found kernel domain");
3187 if (session
->ust_session
!= NULL
) {
3188 DBG3("Listing domains found UST global domain");
3192 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
3193 if (*domains
== NULL
) {
3194 ret
= -LTTCOMM_FATAL
;
3198 if (session
->kernel_session
!= NULL
) {
3199 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
3203 if (session
->ust_session
!= NULL
) {
3204 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
3215 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3217 static ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
3218 struct lttng_channel
**channels
)
3221 ssize_t nb_chan
= 0;
3224 case LTTNG_DOMAIN_KERNEL
:
3225 if (session
->kernel_session
!= NULL
) {
3226 nb_chan
= session
->kernel_session
->channel_count
;
3228 DBG3("Number of kernel channels %zd", nb_chan
);
3230 case LTTNG_DOMAIN_UST
:
3231 if (session
->ust_session
!= NULL
) {
3232 nb_chan
= lttng_ht_get_count(
3233 session
->ust_session
->domain_global
.channels
);
3235 DBG3("Number of UST global channels %zd", nb_chan
);
3244 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
3245 if (*channels
== NULL
) {
3246 ret
= -LTTCOMM_FATAL
;
3250 list_lttng_channels(domain
, session
, *channels
);
3262 * Command LTTNG_LIST_EVENTS processed by the client thread.
3264 static ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
3265 char *channel_name
, struct lttng_event
**events
)
3268 ssize_t nb_event
= 0;
3271 case LTTNG_DOMAIN_KERNEL
:
3272 if (session
->kernel_session
!= NULL
) {
3273 nb_event
= list_lttng_kernel_events(channel_name
,
3274 session
->kernel_session
, events
);
3277 case LTTNG_DOMAIN_UST
:
3279 if (session
->ust_session
!= NULL
) {
3280 nb_event
= list_lttng_ust_global_events(channel_name
,
3281 &session
->ust_session
->domain_global
, events
);
3297 * Process the command requested by the lttng client within the command
3298 * context structure. This function make sure that the return structure (llm)
3299 * is set and ready for transmission before returning.
3301 * Return any error encountered or 0 for success.
3303 static int process_client_msg(struct command_ctx
*cmd_ctx
)
3305 int ret
= LTTCOMM_OK
;
3306 int need_tracing_session
= 1;
3309 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
3311 switch (cmd_ctx
->lsm
->cmd_type
) {
3312 case LTTNG_CREATE_SESSION
:
3313 case LTTNG_DESTROY_SESSION
:
3314 case LTTNG_LIST_SESSIONS
:
3315 case LTTNG_LIST_DOMAINS
:
3316 case LTTNG_START_TRACE
:
3317 case LTTNG_STOP_TRACE
:
3324 if (opt_no_kernel
&& need_domain
3325 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
3327 ret
= LTTCOMM_NEED_ROOT_SESSIOND
;
3329 ret
= LTTCOMM_KERN_NA
;
3335 * Check for command that don't needs to allocate a returned payload. We do
3336 * this here so we don't have to make the call for no payload at each
3339 switch(cmd_ctx
->lsm
->cmd_type
) {
3340 case LTTNG_LIST_SESSIONS
:
3341 case LTTNG_LIST_TRACEPOINTS
:
3342 case LTTNG_LIST_DOMAINS
:
3343 case LTTNG_LIST_CHANNELS
:
3344 case LTTNG_LIST_EVENTS
:
3347 /* Setup lttng message with no payload */
3348 ret
= setup_lttng_msg(cmd_ctx
, 0);
3350 /* This label does not try to unlock the session */
3351 goto init_setup_error
;
3355 /* Commands that DO NOT need a session. */
3356 switch (cmd_ctx
->lsm
->cmd_type
) {
3357 case LTTNG_CREATE_SESSION
:
3358 case LTTNG_CALIBRATE
:
3359 case LTTNG_LIST_SESSIONS
:
3360 case LTTNG_LIST_TRACEPOINTS
:
3361 need_tracing_session
= 0;
3364 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
3366 * We keep the session list lock across _all_ commands
3367 * for now, because the per-session lock does not
3368 * handle teardown properly.
3370 session_lock_list();
3371 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
3372 if (cmd_ctx
->session
== NULL
) {
3373 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
3374 ret
= LTTCOMM_SESS_NOT_FOUND
;
3376 /* If no session name specified */
3377 ret
= LTTCOMM_SELECT_SESS
;
3381 /* Acquire lock for the session */
3382 session_lock(cmd_ctx
->session
);
3391 * Check domain type for specific "pre-action".
3393 switch (cmd_ctx
->lsm
->domain
.type
) {
3394 case LTTNG_DOMAIN_KERNEL
:
3396 ret
= LTTCOMM_NEED_ROOT_SESSIOND
;
3400 /* Kernel tracer check */
3401 if (kernel_tracer_fd
== -1) {
3402 /* Basically, load kernel tracer modules */
3403 ret
= init_kernel_tracer();
3409 /* Consumer is in an ERROR state. Report back to client */
3410 if (uatomic_read(&kernel_consumerd_state
) == CONSUMER_ERROR
) {
3411 ret
= LTTCOMM_NO_KERNCONSUMERD
;
3415 /* Need a session for kernel command */
3416 if (need_tracing_session
) {
3417 if (cmd_ctx
->session
->kernel_session
== NULL
) {
3418 ret
= create_kernel_session(cmd_ctx
->session
);
3420 ret
= LTTCOMM_KERN_SESS_FAIL
;
3425 /* Start the kernel consumer daemon */
3426 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3427 if (kconsumer_data
.pid
== 0 &&
3428 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3429 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3430 ret
= start_consumerd(&kconsumer_data
);
3432 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3435 uatomic_set(&kernel_consumerd_state
, CONSUMER_STARTED
);
3437 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3442 case LTTNG_DOMAIN_UST
:
3444 /* Consumer is in an ERROR state. Report back to client */
3445 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
3446 ret
= LTTCOMM_NO_USTCONSUMERD
;
3450 if (need_tracing_session
) {
3451 if (cmd_ctx
->session
->ust_session
== NULL
) {
3452 ret
= create_ust_session(cmd_ctx
->session
,
3453 &cmd_ctx
->lsm
->domain
);
3454 if (ret
!= LTTCOMM_OK
) {
3458 /* Start the UST consumer daemons */
3460 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
3461 if (consumerd64_bin
[0] != '\0' &&
3462 ustconsumer64_data
.pid
== 0 &&
3463 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3464 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3465 ret
= start_consumerd(&ustconsumer64_data
);
3467 ret
= LTTCOMM_UST_CONSUMER64_FAIL
;
3468 ust_consumerd64_fd
= -EINVAL
;
3472 ust_consumerd64_fd
= ustconsumer64_data
.cmd_sock
;
3473 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
3475 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3478 if (consumerd32_bin
[0] != '\0' &&
3479 ustconsumer32_data
.pid
== 0 &&
3480 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3481 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3482 ret
= start_consumerd(&ustconsumer32_data
);
3484 ret
= LTTCOMM_UST_CONSUMER32_FAIL
;
3485 ust_consumerd32_fd
= -EINVAL
;
3489 ust_consumerd32_fd
= ustconsumer32_data
.cmd_sock
;
3490 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
3492 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3502 /* Validate consumer daemon state when start/stop trace command */
3503 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_START_TRACE
||
3504 cmd_ctx
->lsm
->cmd_type
== LTTNG_STOP_TRACE
) {
3505 switch (cmd_ctx
->lsm
->domain
.type
) {
3506 case LTTNG_DOMAIN_UST
:
3507 if (uatomic_read(&ust_consumerd_state
) != CONSUMER_STARTED
) {
3508 ret
= LTTCOMM_NO_USTCONSUMERD
;
3512 case LTTNG_DOMAIN_KERNEL
:
3513 if (uatomic_read(&kernel_consumerd_state
) != CONSUMER_STARTED
) {
3514 ret
= LTTCOMM_NO_KERNCONSUMERD
;
3522 * Check that the UID or GID match that of the tracing session.
3523 * The root user can interact with all sessions.
3525 if (need_tracing_session
) {
3526 if (!session_access_ok(cmd_ctx
->session
,
3527 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3528 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
3529 ret
= LTTCOMM_EPERM
;
3534 /* Process by command type */
3535 switch (cmd_ctx
->lsm
->cmd_type
) {
3536 case LTTNG_ADD_CONTEXT
:
3538 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3539 cmd_ctx
->lsm
->u
.context
.channel_name
,
3540 cmd_ctx
->lsm
->u
.context
.event_name
,
3541 &cmd_ctx
->lsm
->u
.context
.ctx
);
3544 case LTTNG_DISABLE_CHANNEL
:
3546 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3547 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3550 case LTTNG_DISABLE_EVENT
:
3552 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3553 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3554 cmd_ctx
->lsm
->u
.disable
.name
);
3557 case LTTNG_DISABLE_ALL_EVENT
:
3559 DBG("Disabling all events");
3561 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3562 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3565 case LTTNG_ENABLE_CHANNEL
:
3567 ret
= cmd_enable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3568 &cmd_ctx
->lsm
->u
.channel
.chan
);
3571 case LTTNG_ENABLE_EVENT
:
3573 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3574 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3575 &cmd_ctx
->lsm
->u
.enable
.event
);
3578 case LTTNG_ENABLE_ALL_EVENT
:
3580 DBG("Enabling all events");
3582 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3583 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3584 cmd_ctx
->lsm
->u
.enable
.event
.type
);
3587 case LTTNG_LIST_TRACEPOINTS
:
3589 struct lttng_event
*events
;
3592 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3593 if (nb_events
< 0) {
3599 * Setup lttng message with payload size set to the event list size in
3600 * bytes and then copy list into the llm payload.
3602 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3608 /* Copy event list into message payload */
3609 memcpy(cmd_ctx
->llm
->payload
, events
,
3610 sizeof(struct lttng_event
) * nb_events
);
3617 case LTTNG_START_TRACE
:
3619 ret
= cmd_start_trace(cmd_ctx
->session
);
3622 case LTTNG_STOP_TRACE
:
3624 ret
= cmd_stop_trace(cmd_ctx
->session
);
3627 case LTTNG_CREATE_SESSION
:
3629 ret
= cmd_create_session(cmd_ctx
->lsm
->session
.name
,
3630 cmd_ctx
->lsm
->session
.path
, &cmd_ctx
->creds
);
3633 case LTTNG_DESTROY_SESSION
:
3635 ret
= cmd_destroy_session(cmd_ctx
->session
,
3636 cmd_ctx
->lsm
->session
.name
);
3638 * Set session to NULL so we do not unlock it after
3641 cmd_ctx
->session
= NULL
;
3644 case LTTNG_LIST_DOMAINS
:
3647 struct lttng_domain
*domains
;
3649 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3655 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3660 /* Copy event list into message payload */
3661 memcpy(cmd_ctx
->llm
->payload
, domains
,
3662 nb_dom
* sizeof(struct lttng_domain
));
3669 case LTTNG_LIST_CHANNELS
:
3672 struct lttng_channel
*channels
;
3674 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3675 cmd_ctx
->session
, &channels
);
3681 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3686 /* Copy event list into message payload */
3687 memcpy(cmd_ctx
->llm
->payload
, channels
,
3688 nb_chan
* sizeof(struct lttng_channel
));
3695 case LTTNG_LIST_EVENTS
:
3698 struct lttng_event
*events
= NULL
;
3700 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3701 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3707 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3712 /* Copy event list into message payload */
3713 memcpy(cmd_ctx
->llm
->payload
, events
,
3714 nb_event
* sizeof(struct lttng_event
));
3721 case LTTNG_LIST_SESSIONS
:
3723 unsigned int nr_sessions
;
3725 session_lock_list();
3726 nr_sessions
= lttng_sessions_count(
3727 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3728 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3730 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) * nr_sessions
);
3732 session_unlock_list();
3736 /* Filled the session array */
3737 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
),
3738 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3739 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3741 session_unlock_list();
3746 case LTTNG_CALIBRATE
:
3748 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3749 &cmd_ctx
->lsm
->u
.calibrate
);
3752 case LTTNG_REGISTER_CONSUMER
:
3754 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3755 cmd_ctx
->lsm
->u
.reg
.path
);
3764 if (cmd_ctx
->llm
== NULL
) {
3765 DBG("Missing llm structure. Allocating one.");
3766 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3770 /* Set return code */
3771 cmd_ctx
->llm
->ret_code
= ret
;
3773 if (cmd_ctx
->session
) {
3774 session_unlock(cmd_ctx
->session
);
3776 if (need_tracing_session
) {
3777 session_unlock_list();
3784 * This thread manage all clients request using the unix client socket for
3787 static void *thread_manage_clients(void *data
)
3789 int sock
= -1, ret
, i
, pollfd
;
3790 uint32_t revents
, nb_fd
;
3791 struct command_ctx
*cmd_ctx
= NULL
;
3792 struct lttng_poll_event events
;
3794 DBG("[thread] Manage client started");
3796 rcu_register_thread();
3798 ret
= lttcomm_listen_unix_sock(client_sock
);
3804 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3805 * more will be added to this poll set.
3807 ret
= create_thread_poll_set(&events
, 2);
3812 /* Add the application registration socket */
3813 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3819 * Notify parent pid that we are ready to accept command for client side.
3821 if (opt_sig_parent
) {
3822 kill(ppid
, SIGUSR1
);
3826 DBG("Accepting client command ...");
3828 nb_fd
= LTTNG_POLL_GETNB(&events
);
3830 /* Inifinite blocking call, waiting for transmission */
3832 ret
= lttng_poll_wait(&events
, -1);
3835 * Restart interrupted system call.
3837 if (errno
== EINTR
) {
3843 for (i
= 0; i
< nb_fd
; i
++) {
3844 /* Fetch once the poll data */
3845 revents
= LTTNG_POLL_GETEV(&events
, i
);
3846 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3848 /* Thread quit pipe has been closed. Killing thread. */
3849 ret
= check_thread_quit_pipe(pollfd
, revents
);
3854 /* Event on the registration socket */
3855 if (pollfd
== client_sock
) {
3856 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3857 ERR("Client socket poll error");
3863 DBG("Wait for client response");
3865 sock
= lttcomm_accept_unix_sock(client_sock
);
3870 /* Set socket option for credentials retrieval */
3871 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
3876 /* Allocate context command to process the client request */
3877 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3878 if (cmd_ctx
== NULL
) {
3879 PERROR("zmalloc cmd_ctx");
3883 /* Allocate data buffer for reception */
3884 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3885 if (cmd_ctx
->lsm
== NULL
) {
3886 PERROR("zmalloc cmd_ctx->lsm");
3890 cmd_ctx
->llm
= NULL
;
3891 cmd_ctx
->session
= NULL
;
3894 * Data is received from the lttng client. The struct
3895 * lttcomm_session_msg (lsm) contains the command and data request of
3898 DBG("Receiving data from client ...");
3899 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
3900 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
3902 DBG("Nothing recv() from client... continuing");
3908 clean_command_ctx(&cmd_ctx
);
3912 // TODO: Validate cmd_ctx including sanity check for
3913 // security purpose.
3915 rcu_thread_online();
3917 * This function dispatch the work to the kernel or userspace tracer
3918 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3919 * informations for the client. The command context struct contains
3920 * everything this function may needs.
3922 ret
= process_client_msg(cmd_ctx
);
3923 rcu_thread_offline();
3926 * TODO: Inform client somehow of the fatal error. At
3927 * this point, ret < 0 means that a zmalloc failed
3928 * (ENOMEM). Error detected but still accept command.
3930 clean_command_ctx(&cmd_ctx
);
3934 DBG("Sending response (size: %d, retcode: %s)",
3935 cmd_ctx
->lttng_msg_size
,
3936 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3937 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3939 ERR("Failed to send data back to client");
3942 /* End of transmission */
3949 clean_command_ctx(&cmd_ctx
);
3953 DBG("Client thread dying");
3954 unlink(client_unix_sock_path
);
3955 if (client_sock
>= 0) {
3956 ret
= close(client_sock
);
3968 lttng_poll_clean(&events
);
3969 clean_command_ctx(&cmd_ctx
);
3971 rcu_unregister_thread();
3977 * usage function on stderr
3979 static void usage(void)
3981 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3982 fprintf(stderr
, " -h, --help Display this usage.\n");
3983 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3984 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3985 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3986 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3987 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3988 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3989 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3990 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3991 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3992 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3993 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3994 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3995 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3996 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3997 fprintf(stderr
, " -V, --version Show version number.\n");
3998 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3999 fprintf(stderr
, " -q, --quiet No output at all.\n");
4000 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
4001 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4002 fprintf(stderr
, " --no-kernel Disable kernel tracer\n");
4006 * daemon argument parsing
4008 static int parse_args(int argc
, char **argv
)
4012 static struct option long_options
[] = {
4013 { "client-sock", 1, 0, 'c' },
4014 { "apps-sock", 1, 0, 'a' },
4015 { "kconsumerd-cmd-sock", 1, 0, 'C' },
4016 { "kconsumerd-err-sock", 1, 0, 'E' },
4017 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
4018 { "ustconsumerd32-err-sock", 1, 0, 'H' },
4019 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
4020 { "ustconsumerd64-err-sock", 1, 0, 'F' },
4021 { "consumerd32-path", 1, 0, 'u' },
4022 { "consumerd32-libdir", 1, 0, 'U' },
4023 { "consumerd64-path", 1, 0, 't' },
4024 { "consumerd64-libdir", 1, 0, 'T' },
4025 { "daemonize", 0, 0, 'd' },
4026 { "sig-parent", 0, 0, 'S' },
4027 { "help", 0, 0, 'h' },
4028 { "group", 1, 0, 'g' },
4029 { "version", 0, 0, 'V' },
4030 { "quiet", 0, 0, 'q' },
4031 { "verbose", 0, 0, 'v' },
4032 { "verbose-consumer", 0, 0, 'Z' },
4033 { "no-kernel", 0, 0, 'N' },
4038 int option_index
= 0;
4039 c
= getopt_long(argc
, argv
, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
4040 long_options
, &option_index
);
4047 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
4049 fprintf(stderr
, " with arg %s\n", optarg
);
4053 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4056 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4062 opt_tracing_group
= optarg
;
4068 fprintf(stdout
, "%s\n", VERSION
);
4074 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4077 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4080 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4083 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4086 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4089 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4095 lttng_opt_quiet
= 1;
4098 /* Verbose level can increase using multiple -v */
4099 lttng_opt_verbose
+= 1;
4102 opt_verbose_consumer
+= 1;
4105 consumerd32_bin
= optarg
;
4108 consumerd32_libdir
= optarg
;
4111 consumerd64_bin
= optarg
;
4114 consumerd64_libdir
= optarg
;
4117 /* Unknown option or other error.
4118 * Error is printed by getopt, just return */
4127 * Creates the two needed socket by the daemon.
4128 * apps_sock - The communication socket for all UST apps.
4129 * client_sock - The communication of the cli tool (lttng).
4131 static int init_daemon_socket(void)
4136 old_umask
= umask(0);
4138 /* Create client tool unix socket */
4139 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
4140 if (client_sock
< 0) {
4141 ERR("Create unix sock failed: %s", client_unix_sock_path
);
4146 /* File permission MUST be 660 */
4147 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4149 ERR("Set file permissions failed: %s", client_unix_sock_path
);
4154 /* Create the application unix socket */
4155 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
4156 if (apps_sock
< 0) {
4157 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
4162 /* File permission MUST be 666 */
4163 ret
= chmod(apps_unix_sock_path
,
4164 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
4166 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
4177 * Check if the global socket is available, and if a daemon is answering at the
4178 * other side. If yes, error is returned.
4180 static int check_existing_daemon(void)
4182 /* Is there anybody out there ? */
4183 if (lttng_session_daemon_alive()) {
4191 * Set the tracing group gid onto the client socket.
4193 * Race window between mkdir and chown is OK because we are going from more
4194 * permissive (root.root) to less permissive (root.tracing).
4196 static int set_permissions(char *rundir
)
4201 ret
= allowed_group();
4203 WARN("No tracing group detected");
4210 /* Set lttng run dir */
4211 ret
= chown(rundir
, 0, gid
);
4213 ERR("Unable to set group on %s", rundir
);
4217 /* Ensure tracing group can search the run dir */
4218 ret
= chmod(rundir
, S_IRWXU
| S_IXGRP
| S_IXOTH
);
4220 ERR("Unable to set permissions on %s", rundir
);
4224 /* lttng client socket path */
4225 ret
= chown(client_unix_sock_path
, 0, gid
);
4227 ERR("Unable to set group on %s", client_unix_sock_path
);
4231 /* kconsumer error socket path */
4232 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
4234 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
4238 /* 64-bit ustconsumer error socket path */
4239 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, gid
);
4241 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
4245 /* 32-bit ustconsumer compat32 error socket path */
4246 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, gid
);
4248 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
4252 DBG("All permissions are set");
4259 * Create the pipe used to wake up the kernel thread.
4260 * Closed in cleanup().
4262 static int create_kernel_poll_pipe(void)
4266 ret
= pipe(kernel_poll_pipe
);
4268 PERROR("kernel poll pipe");
4272 for (i
= 0; i
< 2; i
++) {
4273 ret
= fcntl(kernel_poll_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
4275 PERROR("fcntl kernel_poll_pipe");
4285 * Create the application command pipe to wake thread_manage_apps.
4286 * Closed in cleanup().
4288 static int create_apps_cmd_pipe(void)
4292 ret
= pipe(apps_cmd_pipe
);
4294 PERROR("apps cmd pipe");
4298 for (i
= 0; i
< 2; i
++) {
4299 ret
= fcntl(apps_cmd_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
4301 PERROR("fcntl apps_cmd_pipe");
4311 * Create the lttng run directory needed for all global sockets and pipe.
4313 static int create_lttng_rundir(const char *rundir
)
4317 DBG3("Creating LTTng run directory: %s", rundir
);
4319 ret
= mkdir(rundir
, S_IRWXU
);
4321 if (errno
!= EEXIST
) {
4322 ERR("Unable to create %s", rundir
);
4334 * Setup sockets and directory needed by the kconsumerd communication with the
4337 static int set_consumer_sockets(struct consumer_data
*consumer_data
,
4341 char path
[PATH_MAX
];
4343 switch (consumer_data
->type
) {
4344 case LTTNG_CONSUMER_KERNEL
:
4345 snprintf(path
, PATH_MAX
, DEFAULT_KCONSUMERD_PATH
, rundir
);
4347 case LTTNG_CONSUMER64_UST
:
4348 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD64_PATH
, rundir
);
4350 case LTTNG_CONSUMER32_UST
:
4351 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD32_PATH
, rundir
);
4354 ERR("Consumer type unknown");
4359 DBG2("Creating consumer directory: %s", path
);
4361 ret
= mkdir(path
, S_IRWXU
);
4363 if (errno
!= EEXIST
) {
4365 ERR("Failed to create %s", path
);
4371 /* Create the kconsumerd error unix socket */
4372 consumer_data
->err_sock
=
4373 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
4374 if (consumer_data
->err_sock
< 0) {
4375 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
4380 /* File permission MUST be 660 */
4381 ret
= chmod(consumer_data
->err_unix_sock_path
,
4382 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4384 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
4394 * Signal handler for the daemon
4396 * Simply stop all worker threads, leaving main() return gracefully after
4397 * joining all threads and calling cleanup().
4399 static void sighandler(int sig
)
4403 DBG("SIGPIPE caught");
4406 DBG("SIGINT caught");
4410 DBG("SIGTERM caught");
4419 * Setup signal handler for :
4420 * SIGINT, SIGTERM, SIGPIPE
4422 static int set_signal_handler(void)
4425 struct sigaction sa
;
4428 if ((ret
= sigemptyset(&sigset
)) < 0) {
4429 PERROR("sigemptyset");
4433 sa
.sa_handler
= sighandler
;
4434 sa
.sa_mask
= sigset
;
4436 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
4437 PERROR("sigaction");
4441 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
4442 PERROR("sigaction");
4446 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
4447 PERROR("sigaction");
4451 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4457 * Set open files limit to unlimited. This daemon can open a large number of
4458 * file descriptors in order to consumer multiple kernel traces.
4460 static void set_ulimit(void)
4465 /* The kernel does not allowed an infinite limit for open files */
4466 lim
.rlim_cur
= 65535;
4467 lim
.rlim_max
= 65535;
4469 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
4471 PERROR("failed to set open files limit");
4478 int main(int argc
, char **argv
)
4482 const char *home_path
;
4484 init_kernel_workarounds();
4486 rcu_register_thread();
4488 /* Create thread quit pipe */
4489 if ((ret
= init_thread_quit_pipe()) < 0) {
4493 setup_consumerd_path();
4495 /* Parse arguments */
4497 if ((ret
= parse_args(argc
, argv
) < 0)) {
4510 /* Check if daemon is UID = 0 */
4511 is_root
= !getuid();
4514 rundir
= strdup(DEFAULT_LTTNG_RUNDIR
);
4516 /* Create global run dir with root access */
4517 ret
= create_lttng_rundir(rundir
);
4522 if (strlen(apps_unix_sock_path
) == 0) {
4523 snprintf(apps_unix_sock_path
, PATH_MAX
,
4524 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
4527 if (strlen(client_unix_sock_path
) == 0) {
4528 snprintf(client_unix_sock_path
, PATH_MAX
,
4529 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
4532 /* Set global SHM for ust */
4533 if (strlen(wait_shm_path
) == 0) {
4534 snprintf(wait_shm_path
, PATH_MAX
,
4535 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
4538 /* Setup kernel consumerd path */
4539 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
,
4540 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
, rundir
);
4541 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
,
4542 DEFAULT_KCONSUMERD_CMD_SOCK_PATH
, rundir
);
4544 DBG2("Kernel consumer err path: %s",
4545 kconsumer_data
.err_unix_sock_path
);
4546 DBG2("Kernel consumer cmd path: %s",
4547 kconsumer_data
.cmd_unix_sock_path
);
4549 home_path
= get_home_dir();
4550 if (home_path
== NULL
) {
4551 /* TODO: Add --socket PATH option */
4552 ERR("Can't get HOME directory for sockets creation.");
4558 * Create rundir from home path. This will create something like
4561 ret
= asprintf(&rundir
, DEFAULT_LTTNG_HOME_RUNDIR
, home_path
);
4567 ret
= create_lttng_rundir(rundir
);
4572 if (strlen(apps_unix_sock_path
) == 0) {
4573 snprintf(apps_unix_sock_path
, PATH_MAX
,
4574 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
4577 /* Set the cli tool unix socket path */
4578 if (strlen(client_unix_sock_path
) == 0) {
4579 snprintf(client_unix_sock_path
, PATH_MAX
,
4580 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
4583 /* Set global SHM for ust */
4584 if (strlen(wait_shm_path
) == 0) {
4585 snprintf(wait_shm_path
, PATH_MAX
,
4586 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
4590 /* Set consumer initial state */
4591 kernel_consumerd_state
= CONSUMER_STOPPED
;
4592 ust_consumerd_state
= CONSUMER_STOPPED
;
4594 DBG("Client socket path %s", client_unix_sock_path
);
4595 DBG("Application socket path %s", apps_unix_sock_path
);
4596 DBG("LTTng run directory path: %s", rundir
);
4598 /* 32 bits consumerd path setup */
4599 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
,
4600 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, rundir
);
4601 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
,
4602 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, rundir
);
4604 DBG2("UST consumer 32 bits err path: %s",
4605 ustconsumer32_data
.err_unix_sock_path
);
4606 DBG2("UST consumer 32 bits cmd path: %s",
4607 ustconsumer32_data
.cmd_unix_sock_path
);
4609 /* 64 bits consumerd path setup */
4610 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
,
4611 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, rundir
);
4612 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
,
4613 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, rundir
);
4615 DBG2("UST consumer 64 bits err path: %s",
4616 ustconsumer64_data
.err_unix_sock_path
);
4617 DBG2("UST consumer 64 bits cmd path: %s",
4618 ustconsumer64_data
.cmd_unix_sock_path
);
4621 * See if daemon already exist.
4623 if ((ret
= check_existing_daemon()) < 0) {
4624 ERR("Already running daemon.\n");
4626 * We do not goto exit because we must not cleanup()
4627 * because a daemon is already running.
4633 * Init UST app hash table. Alloc hash table before this point since
4634 * cleanup() can get called after that point.
4638 /* After this point, we can safely call cleanup() with "goto exit" */
4641 * These actions must be executed as root. We do that *after* setting up
4642 * the sockets path because we MUST make the check for another daemon using
4643 * those paths *before* trying to set the kernel consumer sockets and init
4647 ret
= set_consumer_sockets(&kconsumer_data
, rundir
);
4652 /* Setup kernel tracer */
4653 if (!opt_no_kernel
) {
4654 init_kernel_tracer();
4657 /* Set ulimit for open files */
4660 /* init lttng_fd tracking must be done after set_ulimit. */
4663 ret
= set_consumer_sockets(&ustconsumer64_data
, rundir
);
4668 ret
= set_consumer_sockets(&ustconsumer32_data
, rundir
);
4673 if ((ret
= set_signal_handler()) < 0) {
4677 /* Setup the needed unix socket */
4678 if ((ret
= init_daemon_socket()) < 0) {
4682 /* Set credentials to socket */
4683 if (is_root
&& ((ret
= set_permissions(rundir
)) < 0)) {
4687 /* Get parent pid if -S, --sig-parent is specified. */
4688 if (opt_sig_parent
) {
4692 /* Setup the kernel pipe for waking up the kernel thread */
4693 if ((ret
= create_kernel_poll_pipe()) < 0) {
4697 /* Setup the thread apps communication pipe. */
4698 if ((ret
= create_apps_cmd_pipe()) < 0) {
4702 /* Init UST command queue. */
4703 cds_wfq_init(&ust_cmd_queue
.queue
);
4706 * Get session list pointer. This pointer MUST NOT be free(). This list is
4707 * statically declared in session.c
4709 session_list_ptr
= session_get_list();
4711 /* Set up max poll set size */
4712 lttng_poll_set_max_size();
4714 /* Create thread to manage the client socket */
4715 ret
= pthread_create(&client_thread
, NULL
,
4716 thread_manage_clients
, (void *) NULL
);
4718 PERROR("pthread_create clients");
4722 /* Create thread to dispatch registration */
4723 ret
= pthread_create(&dispatch_thread
, NULL
,
4724 thread_dispatch_ust_registration
, (void *) NULL
);
4726 PERROR("pthread_create dispatch");
4730 /* Create thread to manage application registration. */
4731 ret
= pthread_create(®_apps_thread
, NULL
,
4732 thread_registration_apps
, (void *) NULL
);
4734 PERROR("pthread_create registration");
4738 /* Create thread to manage application socket */
4739 ret
= pthread_create(&apps_thread
, NULL
,
4740 thread_manage_apps
, (void *) NULL
);
4742 PERROR("pthread_create apps");
4746 /* Create kernel thread to manage kernel event */
4747 ret
= pthread_create(&kernel_thread
, NULL
,
4748 thread_manage_kernel
, (void *) NULL
);
4750 PERROR("pthread_create kernel");
4754 ret
= pthread_join(kernel_thread
, &status
);
4756 PERROR("pthread_join");
4757 goto error
; /* join error, exit without cleanup */
4761 ret
= pthread_join(apps_thread
, &status
);
4763 PERROR("pthread_join");
4764 goto error
; /* join error, exit without cleanup */
4768 ret
= pthread_join(reg_apps_thread
, &status
);
4770 PERROR("pthread_join");
4771 goto error
; /* join error, exit without cleanup */
4775 ret
= pthread_join(dispatch_thread
, &status
);
4777 PERROR("pthread_join");
4778 goto error
; /* join error, exit without cleanup */
4782 ret
= pthread_join(client_thread
, &status
);
4784 PERROR("pthread_join");
4785 goto error
; /* join error, exit without cleanup */
4788 ret
= join_consumer_thread(&kconsumer_data
);
4790 PERROR("join_consumer");
4791 goto error
; /* join error, exit without cleanup */
4797 * cleanup() is called when no other thread is running.
4799 rcu_thread_online();
4801 rcu_thread_offline();
4802 rcu_unregister_thread();